drivers/net/vxlan/vxlan_core.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * VXLAN: Virtual eXtensible Local Area Network
   4  *
   5  * Copyright (c) 2012-2013 Vyatta Inc.
   6  */
   7
   8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   9
  10 #include <linux/kernel.h>
  11 #include <linux/module.h>
  12 #include <linux/errno.h>
  13 #include <linux/slab.h>
  14 #include <linux/udp.h>
  15 #include <linux/igmp.h>
  16 #include <linux/if_ether.h>
  17 #include <linux/ethtool.h>
  18 #include <net/arp.h>
  19 #include <net/ndisc.h>
  20 #include <net/ipv6_stubs.h>
  21 #include <net/ip.h>
  22 #include <net/icmp.h>
  23 #include <net/rtnetlink.h>
  24 #include <net/inet_ecn.h>
  25 #include <net/net_namespace.h>
  26 #include <net/netns/generic.h>
  27 #include <net/tun_proto.h>
  28 #include <net/vxlan.h>
  29 #include <net/nexthop.h>
  30
  31 #if IS_ENABLED(CONFIG_IPV6)
  32 #include <net/ip6_tunnel.h>
  33 #include <net/ip6_checksum.h>
  34 #endif
  35
  36 #define VXLAN_VERSION   "0.1"
  37
  38 #define PORT_HASH_BITS  8
  39 #define PORT_HASH_SIZE  (1<<PORT_HASH_BITS)
  40 #define FDB_AGE_DEFAULT 300 /* 5 min */
  41 #define FDB_AGE_INTERVAL (10 * HZ)      /* rescan interval */
  42
  43 /* UDP port for VXLAN traffic.
  44  * The IANA assigned port is 4789, but the Linux default is 8472
  45  * for compatibility with early adopters.
  46  */
  47 static unsigned short vxlan_port __read_mostly = 8472;
  48 module_param_named(udp_port, vxlan_port, ushort, 0444);
  49 MODULE_PARM_DESC(udp_port, "Destination UDP port");
  50
  51 static bool log_ecn_error = true;
  52 module_param(log_ecn_error, bool, 0644);
  53 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
  54
  55 static unsigned int vxlan_net_id;
  56 static struct rtnl_link_ops vxlan_link_ops;
  57
  58 static const u8 all_zeros_mac[ETH_ALEN + 2];
  59
  60 static int vxlan_sock_add(struct vxlan_dev *vxlan);
  61
  62 static void vxlan_vs_del_dev(struct vxlan_dev *vxlan);
  63
  64 /* per-network namespace private data for this module */
  65 struct vxlan_net {
  66         struct list_head  vxlan_list;
  67         struct hlist_head sock_list[PORT_HASH_SIZE];
  68         spinlock_t        sock_lock;
  69 };
  70
  71 /* Forwarding table entry */
  72 struct vxlan_fdb {
  73         struct hlist_node hlist;        /* linked list of entries */
  74         struct rcu_head   rcu;
  75         unsigned long     updated;      /* jiffies */
  76         unsigned long     used;
  77         struct list_head  remotes;
  78         u8                eth_addr[ETH_ALEN];
  79         u16               state;        /* see ndm_state */
  80         __be32            vni;
  81         u16               flags;        /* see ndm_flags and below */
  82         struct list_head  nh_list;
  83         struct nexthop __rcu *nh;
  84         struct vxlan_dev  __rcu *vdev;
  85 };
  86
  87 #define NTF_VXLAN_ADDED_BY_USER 0x100
  88
  89 /* salt for hash table */
  90 static u32 vxlan_salt __read_mostly;
  91
  92 static inline bool vxlan_collect_metadata(struct vxlan_sock *vs)
  93 {
  94         return vs->flags & VXLAN_F_COLLECT_METADATA ||
  95                ip_tunnel_collect_metadata();
  96 }
  97
  98 #if IS_ENABLED(CONFIG_IPV6)
  99 static inline
 100 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
 101 {
 102         if (a->sa.sa_family != b->sa.sa_family)
 103                 return false;
 104         if (a->sa.sa_family == AF_INET6)
 105                 return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
 106         else
 107                 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
 108 }
 109
 110 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
 111 {
 112         if (nla_len(nla) >= sizeof(struct in6_addr)) {
 113                 ip->sin6.sin6_addr = nla_get_in6_addr(nla);
 114                 ip->sa.sa_family = AF_INET6;
 115                 return 0;
 116         } else if (nla_len(nla) >= sizeof(__be32)) {
 117                 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
 118                 ip->sa.sa_family = AF_INET;
 119                 return 0;
 120         } else {
 121                 return -EAFNOSUPPORT;
 122         }
 123 }
 124
 125 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
 126                               const union vxlan_addr *ip)
 127 {
 128         if (ip->sa.sa_family == AF_INET6)
 129                 return nla_put_in6_addr(skb, attr, &ip->sin6.sin6_addr);
 130         else
 131                 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
 132 }
 133
 134 #else /* !CONFIG_IPV6 */
 135
 136 static inline
 137 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
 138 {
 139         return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
 140 }
 141
 142 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
 143 {
 144         if (nla_len(nla) >= sizeof(struct in6_addr)) {
 145                 return -EAFNOSUPPORT;
 146         } else if (nla_len(nla) >= sizeof(__be32)) {
 147                 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
 148                 ip->sa.sa_family = AF_INET;
 149                 return 0;
 150         } else {
 151                 return -EAFNOSUPPORT;
 152         }
 153 }
 154
 155 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
 156                               const union vxlan_addr *ip)
 157 {
 158         return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
 159 }
 160 #endif
 161
 162 /* Virtual Network hash table head */
 163 static inline struct hlist_head *vni_head(struct vxlan_sock *vs, __be32 vni)
 164 {
 165         return &vs->vni_list[hash_32((__force u32)vni, VNI_HASH_BITS)];
 166 }
 167
 168 /* Socket hash table head */
 169 static inline struct hlist_head *vs_head(struct net *net, __be16 port)
 170 {
 171         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
 172
 173         return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
 174 }
 175
 176 /* First remote destination for a forwarding entry.
 177  * Guaranteed to be non-NULL because remotes are never deleted.
 178  */
 179 static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
 180 {
 181         if (rcu_access_pointer(fdb->nh))
 182                 return NULL;
 183         return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
 184 }
 185
 186 static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
 187 {
 188         if (rcu_access_pointer(fdb->nh))
 189                 return NULL;
 190         return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
 191 }
 192
 193 /* Find VXLAN socket based on network namespace, address family, UDP port,
 194  * enabled unshareable flags and socket device binding (see l3mdev with
 195  * non-default VRF).
 196  */
 197 static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family,
 198                                           __be16 port, u32 flags, int ifindex)
 199 {
 200         struct vxlan_sock *vs;
 201
 202         flags &= VXLAN_F_RCV_FLAGS;
 203
 204         hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
 205                 if (inet_sk(vs->sock->sk)->inet_sport == port &&
 206                     vxlan_get_sk_family(vs) == family &&
 207                     vs->flags == flags &&
 208                     vs->sock->sk->sk_bound_dev_if == ifindex)
 209                         return vs;
 210         }
 211         return NULL;
 212 }
 213
 214 static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, int ifindex,
 215                                            __be32 vni)
 216 {
 217         struct vxlan_dev_node *node;
 218
 219         /* For flow based devices, map all packets to VNI 0 */
 220         if (vs->flags & VXLAN_F_COLLECT_METADATA)
 221                 vni = 0;
 222
 223         hlist_for_each_entry_rcu(node, vni_head(vs, vni), hlist) {
 224                 if (node->vxlan->default_dst.remote_vni != vni)
 225                         continue;
 226
 227                 if (IS_ENABLED(CONFIG_IPV6)) {
 228                         const struct vxlan_config *cfg = &node->vxlan->cfg;
 229
 230                         if ((cfg->flags & VXLAN_F_IPV6_LINKLOCAL) &&
 231                             cfg->remote_ifindex != ifindex)
 232                                 continue;
 233                 }
 234
 235                 return node->vxlan;
 236         }
 237
 238         return NULL;
 239 }
 240
 241 /* Look up VNI in a per net namespace table */
 242 static struct vxlan_dev *vxlan_find_vni(struct net *net, int ifindex,
 243                                         __be32 vni, sa_family_t family,
 244                                         __be16 port, u32 flags)
 245 {
 246         struct vxlan_sock *vs;
 247
 248         vs = vxlan_find_sock(net, family, port, flags, ifindex);
 249         if (!vs)
 250                 return NULL;
 251
 252         return vxlan_vs_find_vni(vs, ifindex, vni);
 253 }
 254
 255 /* Fill in neighbour message in skbuff. */
 256 static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
 257                           const struct vxlan_fdb *fdb,
 258                           u32 portid, u32 seq, int type, unsigned int flags,
 259                           const struct vxlan_rdst *rdst)
 260 {
 261         unsigned long now = jiffies;
 262         struct nda_cacheinfo ci;
 263         bool send_ip, send_eth;
 264         struct nlmsghdr *nlh;
 265         struct nexthop *nh;
 266         struct ndmsg *ndm;
 267         int nh_family;
 268         u32 nh_id;
 269
 270         nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
 271         if (nlh == NULL)
 272                 return -EMSGSIZE;
 273
 274         ndm = nlmsg_data(nlh);
 275         memset(ndm, 0, sizeof(*ndm));
 276
 277         send_eth = send_ip = true;
 278
 279         rcu_read_lock();
 280         nh = rcu_dereference(fdb->nh);
 281         if (nh) {
 282                 nh_family = nexthop_get_family(nh);
 283                 nh_id = nh->id;
 284         }
 285         rcu_read_unlock();
 286
 287         if (type == RTM_GETNEIGH) {
 288                 if (rdst) {
 289                         send_ip = !vxlan_addr_any(&rdst->remote_ip);
 290                         ndm->ndm_family = send_ip ? rdst->remote_ip.sa.sa_family : AF_INET;
 291                 } else if (nh) {
 292                         ndm->ndm_family = nh_family;
 293                 }
 294                 send_eth = !is_zero_ether_addr(fdb->eth_addr);
 295         } else
 296                 ndm->ndm_family = AF_BRIDGE;
 297         ndm->ndm_state = fdb->state;
 298         ndm->ndm_ifindex = vxlan->dev->ifindex;
 299         ndm->ndm_flags = fdb->flags;
 300         if (rdst && rdst->offloaded)
 301                 ndm->ndm_flags |= NTF_OFFLOADED;
 302         ndm->ndm_type = RTN_UNICAST;
 303
 304         if (!net_eq(dev_net(vxlan->dev), vxlan->net) &&
 305             nla_put_s32(skb, NDA_LINK_NETNSID,
 306                         peernet2id(dev_net(vxlan->dev), vxlan->net)))
 307                 goto nla_put_failure;
 308
 309         if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
 310                 goto nla_put_failure;
 311         if (nh) {
 312                 if (nla_put_u32(skb, NDA_NH_ID, nh_id))
 313                         goto nla_put_failure;
 314         } else if (rdst) {
 315                 if (send_ip && vxlan_nla_put_addr(skb, NDA_DST,
 316                                                   &rdst->remote_ip))
 317                         goto nla_put_failure;
 318
 319                 if (rdst->remote_port &&
 320                     rdst->remote_port != vxlan->cfg.dst_port &&
 321                     nla_put_be16(skb, NDA_PORT, rdst->remote_port))
 322                         goto nla_put_failure;
 323                 if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
 324                     nla_put_u32(skb, NDA_VNI, be32_to_cpu(rdst->remote_vni)))
 325                         goto nla_put_failure;
 326                 if (rdst->remote_ifindex &&
 327                     nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
 328                         goto nla_put_failure;
 329         }
 330
 331         if ((vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) && fdb->vni &&
 332             nla_put_u32(skb, NDA_SRC_VNI,
 333                         be32_to_cpu(fdb->vni)))
 334                 goto nla_put_failure;
 335
 336         ci.ndm_used      = jiffies_to_clock_t(now - fdb->used);
 337         ci.ndm_confirmed = 0;
 338         ci.ndm_updated   = jiffies_to_clock_t(now - fdb->updated);
 339         ci.ndm_refcnt    = 0;
 340
 341         if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
 342                 goto nla_put_failure;
 343
 344         nlmsg_end(skb, nlh);
 345         return 0;
 346
 347 nla_put_failure:
 348         nlmsg_cancel(skb, nlh);
 349         return -EMSGSIZE;
 350 }
 351
 352 static inline size_t vxlan_nlmsg_size(void)
 353 {
 354         return NLMSG_ALIGN(sizeof(struct ndmsg))
 355                 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
 356                 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
 357                 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
 358                 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
 359                 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
 360                 + nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */
 361                 + nla_total_size(sizeof(struct nda_cacheinfo));
 362 }
 363
 364 static void __vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
 365                                struct vxlan_rdst *rd, int type)
 366 {
 367         struct net *net = dev_net(vxlan->dev);
 368         struct sk_buff *skb;
 369         int err = -ENOBUFS;
 370
 371         skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
 372         if (skb == NULL)
 373                 goto errout;
 374
 375         err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
 376         if (err < 0) {
 377                 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
 378                 WARN_ON(err == -EMSGSIZE);
 379                 kfree_skb(skb);
 380                 goto errout;
 381         }
 382
 383         rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
 384         return;
 385 errout:
 386         if (err < 0)
 387                 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
 388 }
 389
 390 static void vxlan_fdb_switchdev_notifier_info(const struct vxlan_dev *vxlan,
 391                             const struct vxlan_fdb *fdb,
 392                             const struct vxlan_rdst *rd,
 393                             struct netlink_ext_ack *extack,
 394                             struct switchdev_notifier_vxlan_fdb_info *fdb_info)
 395 {
 396         fdb_info->info.dev = vxlan->dev;
 397         fdb_info->info.extack = extack;
 398         fdb_info->remote_ip = rd->remote_ip;
 399         fdb_info->remote_port = rd->remote_port;
 400         fdb_info->remote_vni = rd->remote_vni;
 401         fdb_info->remote_ifindex = rd->remote_ifindex;
 402         memcpy(fdb_info->eth_addr, fdb->eth_addr, ETH_ALEN);
 403         fdb_info->vni = fdb->vni;
 404         fdb_info->offloaded = rd->offloaded;
 405         fdb_info->added_by_user = fdb->flags & NTF_VXLAN_ADDED_BY_USER;
 406 }
 407
 408 static int vxlan_fdb_switchdev_call_notifiers(struct vxlan_dev *vxlan,
 409                                               struct vxlan_fdb *fdb,
 410                                               struct vxlan_rdst *rd,
 411                                               bool adding,
 412                                               struct netlink_ext_ack *extack)
 413 {
 414         struct switchdev_notifier_vxlan_fdb_info info;
 415         enum switchdev_notifier_type notifier_type;
 416         int ret;
 417
 418         if (WARN_ON(!rd))
 419                 return 0;
 420
 421         notifier_type = adding ? SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE
 422                                : SWITCHDEV_VXLAN_FDB_DEL_TO_DEVICE;
 423         vxlan_fdb_switchdev_notifier_info(vxlan, fdb, rd, NULL, &info);
 424         ret = call_switchdev_notifiers(notifier_type, vxlan->dev,
 425                                        &info.info, extack);
 426         return notifier_to_errno(ret);
 427 }
 428
 429 static int vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
 430                             struct vxlan_rdst *rd, int type, bool swdev_notify,
 431                             struct netlink_ext_ack *extack)
 432 {
 433         int err;
 434
 435         if (swdev_notify && rd) {
 436                 switch (type) {
 437                 case RTM_NEWNEIGH:
 438                         err = vxlan_fdb_switchdev_call_notifiers(vxlan, fdb, rd,
 439                                                                  true, extack);
 440                         if (err)
 441                                 return err;
 442                         break;
 443                 case RTM_DELNEIGH:
 444                         vxlan_fdb_switchdev_call_notifiers(vxlan, fdb, rd,
 445                                                            false, extack);
 446                         break;
 447                 }
 448         }
 449
 450         __vxlan_fdb_notify(vxlan, fdb, rd, type);
 451         return 0;
 452 }
 453
 454 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
 455 {
 456         struct vxlan_dev *vxlan = netdev_priv(dev);
 457         struct vxlan_fdb f = {
 458                 .state = NUD_STALE,
 459         };
 460         struct vxlan_rdst remote = {
 461                 .remote_ip = *ipa, /* goes to NDA_DST */
 462                 .remote_vni = cpu_to_be32(VXLAN_N_VID),
 463         };
 464
 465         vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH, true, NULL);
 466 }
 467
 468 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
 469 {
 470         struct vxlan_fdb f = {
 471                 .state = NUD_STALE,
 472         };
 473         struct vxlan_rdst remote = { };
 474
 475         memcpy(f.eth_addr, eth_addr, ETH_ALEN);
 476
 477         vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH, true, NULL);
 478 }
 479
 480 /* Hash Ethernet address */
 481 static u32 eth_hash(const unsigned char *addr)
 482 {
 483         u64 value = get_unaligned((u64 *)addr);
 484
 485         /* only want 6 bytes */
 486 #ifdef __BIG_ENDIAN
 487         value >>= 16;
 488 #else
 489         value <<= 16;
 490 #endif
 491         return hash_64(value, FDB_HASH_BITS);
 492 }
 493
 494 static u32 eth_vni_hash(const unsigned char *addr, __be32 vni)
 495 {
 496         /* use 1 byte of OUI and 3 bytes of NIC */
 497         u32 key = get_unaligned((u32 *)(addr + 2));
 498
 499         return jhash_2words(key, vni, vxlan_salt) & (FDB_HASH_SIZE - 1);
 500 }
 501
 502 static u32 fdb_head_index(struct vxlan_dev *vxlan, const u8 *mac, __be32 vni)
 503 {
 504         if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)
 505                 return eth_vni_hash(mac, vni);
 506         else
 507                 return eth_hash(mac);
 508 }
 509
 510 /* Hash chain to use given mac address */
 511 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
 512                                                 const u8 *mac, __be32 vni)
 513 {
 514         return &vxlan->fdb_head[fdb_head_index(vxlan, mac, vni)];
 515 }
 516
 517 /* Look up Ethernet address in forwarding table */
 518 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
 519                                           const u8 *mac, __be32 vni)
 520 {
 521         struct hlist_head *head = vxlan_fdb_head(vxlan, mac, vni);
 522         struct vxlan_fdb *f;
 523
 524         hlist_for_each_entry_rcu(f, head, hlist) {
 525                 if (ether_addr_equal(mac, f->eth_addr)) {
 526                         if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) {
 527                                 if (vni == f->vni)
 528                                         return f;
 529                         } else {
 530                                 return f;
 531                         }
 532                 }
 533         }
 534
 535         return NULL;
 536 }
 537
 538 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
 539                                         const u8 *mac, __be32 vni)
 540 {
 541         struct vxlan_fdb *f;
 542
 543         f = __vxlan_find_mac(vxlan, mac, vni);
 544         if (f && f->used != jiffies)
 545                 f->used = jiffies;
 546
 547         return f;
 548 }
 549
 550 /* caller should hold vxlan->hash_lock */
 551 static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
 552                                               union vxlan_addr *ip, __be16 port,
 553                                               __be32 vni, __u32 ifindex)
 554 {
 555         struct vxlan_rdst *rd;
 556
 557         list_for_each_entry(rd, &f->remotes, list) {
 558                 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
 559                     rd->remote_port == port &&
 560                     rd->remote_vni == vni &&
 561                     rd->remote_ifindex == ifindex)
 562                         return rd;
 563         }
 564
 565         return NULL;
 566 }
 567
 568 int vxlan_fdb_find_uc(struct net_device *dev, const u8 *mac, __be32 vni,
 569                       struct switchdev_notifier_vxlan_fdb_info *fdb_info)
 570 {
 571         struct vxlan_dev *vxlan = netdev_priv(dev);
 572         u8 eth_addr[ETH_ALEN + 2] = { 0 };
 573         struct vxlan_rdst *rdst;
 574         struct vxlan_fdb *f;
 575         int rc = 0;
 576
 577         if (is_multicast_ether_addr(mac) ||
 578             is_zero_ether_addr(mac))
 579                 return -EINVAL;
 580
 581         ether_addr_copy(eth_addr, mac);
 582
 583         rcu_read_lock();
 584
 585         f = __vxlan_find_mac(vxlan, eth_addr, vni);
 586         if (!f) {
 587                 rc = -ENOENT;
 588                 goto out;
 589         }
 590
 591         rdst = first_remote_rcu(f);
 592         vxlan_fdb_switchdev_notifier_info(vxlan, f, rdst, NULL, fdb_info);
 593
 594 out:
 595         rcu_read_unlock();
 596         return rc;
 597 }
 598 EXPORT_SYMBOL_GPL(vxlan_fdb_find_uc);
 599
 600 static int vxlan_fdb_notify_one(struct notifier_block *nb,
 601                                 const struct vxlan_dev *vxlan,
 602                                 const struct vxlan_fdb *f,
 603                                 const struct vxlan_rdst *rdst,
 604                                 struct netlink_ext_ack *extack)
 605 {
 606         struct switchdev_notifier_vxlan_fdb_info fdb_info;
 607         int rc;
 608
 609         vxlan_fdb_switchdev_notifier_info(vxlan, f, rdst, extack, &fdb_info);
 610         rc = nb->notifier_call(nb, SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE,
 611                                &fdb_info);
 612         return notifier_to_errno(rc);
 613 }
 614
 615 int vxlan_fdb_replay(const struct net_device *dev, __be32 vni,
 616                      struct notifier_block *nb,
 617                      struct netlink_ext_ack *extack)
 618 {
 619         struct vxlan_dev *vxlan;
 620         struct vxlan_rdst *rdst;
 621         struct vxlan_fdb *f;
 622         unsigned int h;
 623         int rc = 0;
 624
 625         if (!netif_is_vxlan(dev))
 626                 return -EINVAL;
 627         vxlan = netdev_priv(dev);
 628
 629         for (h = 0; h < FDB_HASH_SIZE; ++h) {
 630                 spin_lock_bh(&vxlan->hash_lock[h]);
 631                 hlist_for_each_entry(f, &vxlan->fdb_head[h], hlist) {
 632                         if (f->vni == vni) {
 633                                 list_for_each_entry(rdst, &f->remotes, list) {
 634                                         rc = vxlan_fdb_notify_one(nb, vxlan,
 635                                                                   f, rdst,
 636                                                                   extack);
 637                                         if (rc)
 638                                                 goto unlock;
 639                                 }
 640                         }
 641                 }
 642                 spin_unlock_bh(&vxlan->hash_lock[h]);
 643         }
 644         return 0;
 645
 646 unlock:
 647         spin_unlock_bh(&vxlan->hash_lock[h]);
 648         return rc;
 649 }
 650 EXPORT_SYMBOL_GPL(vxlan_fdb_replay);
 651
 652 void vxlan_fdb_clear_offload(const struct net_device *dev, __be32 vni)
 653 {
 654         struct vxlan_dev *vxlan;
 655         struct vxlan_rdst *rdst;
 656         struct vxlan_fdb *f;
 657         unsigned int h;
 658
 659         if (!netif_is_vxlan(dev))
 660                 return;
 661         vxlan = netdev_priv(dev);
 662
 663         for (h = 0; h < FDB_HASH_SIZE; ++h) {
 664                 spin_lock_bh(&vxlan->hash_lock[h]);
 665                 hlist_for_each_entry(f, &vxlan->fdb_head[h], hlist)
 666                         if (f->vni == vni)
 667                                 list_for_each_entry(rdst, &f->remotes, list)
 668                                         rdst->offloaded = false;
 669                 spin_unlock_bh(&vxlan->hash_lock[h]);
 670         }
 671
 672 }
 673 EXPORT_SYMBOL_GPL(vxlan_fdb_clear_offload);
 674
 675 /* Replace destination of unicast mac */
 676 static int vxlan_fdb_replace(struct vxlan_fdb *f,
 677                              union vxlan_addr *ip, __be16 port, __be32 vni,
 678                              __u32 ifindex, struct vxlan_rdst *oldrd)
 679 {
 680         struct vxlan_rdst *rd;
 681
 682         rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
 683         if (rd)
 684                 return 0;
 685
 686         rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
 687         if (!rd)
 688                 return 0;
 689
 690         *oldrd = *rd;
 691         dst_cache_reset(&rd->dst_cache);
 692         rd->remote_ip = *ip;
 693         rd->remote_port = port;
 694         rd->remote_vni = vni;
 695         rd->remote_ifindex = ifindex;
 696         rd->offloaded = false;
 697         return 1;
 698 }
 699
 700 /* Add/update destinations for multicast */
 701 static int vxlan_fdb_append(struct vxlan_fdb *f,
 702                             union vxlan_addr *ip, __be16 port, __be32 vni,
 703                             __u32 ifindex, struct vxlan_rdst **rdp)
 704 {
 705         struct vxlan_rdst *rd;
 706
 707         rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
 708         if (rd)
 709                 return 0;
 710
 711         rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
 712         if (rd == NULL)
 713                 return -ENOMEM;
 714
 715         if (dst_cache_init(&rd->dst_cache, GFP_ATOMIC)) {
 716                 kfree(rd);
 717                 return -ENOMEM;
 718         }
 719
 720         rd->remote_ip = *ip;
 721         rd->remote_port = port;
 722         rd->offloaded = false;
 723         rd->remote_vni = vni;
 724         rd->remote_ifindex = ifindex;
 725
 726         list_add_tail_rcu(&rd->list, &f->remotes);
 727
 728         *rdp = rd;
 729         return 1;
 730 }
 731
 732 static bool vxlan_parse_gpe_proto(struct vxlanhdr *hdr, __be16 *protocol)
 733 {
 734         struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)hdr;
 735
 736         /* Need to have Next Protocol set for interfaces in GPE mode. */
 737         if (!gpe->np_applied)
 738                 return false;
 739         /* "The initial version is 0. If a receiver does not support the
 740          * version indicated it MUST drop the packet.
 741          */
 742         if (gpe->version != 0)
 743                 return false;
 744         /* "When the O bit is set to 1, the packet is an OAM packet and OAM
 745          * processing MUST occur." However, we don't implement OAM
 746          * processing, thus drop the packet.
 747          */
 748         if (gpe->oam_flag)
 749                 return false;
 750
 751         *protocol = tun_p_to_eth_p(gpe->next_protocol);
 752         if (!*protocol)
 753                 return false;
 754
 755         return true;
 756 }
 757
 758 static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
 759                                           unsigned int off,
 760                                           struct vxlanhdr *vh, size_t hdrlen,
 761                                           __be32 vni_field,
 762                                           struct gro_remcsum *grc,
 763                                           bool nopartial)
 764 {
 765         size_t start, offset;
 766
 767         if (skb->remcsum_offload)
 768                 return vh;
 769
 770         if (!NAPI_GRO_CB(skb)->csum_valid)
 771                 return NULL;
 772
 773         start = vxlan_rco_start(vni_field);
 774         offset = start + vxlan_rco_offset(vni_field);
 775
 776         vh = skb_gro_remcsum_process(skb, (void *)vh, off, hdrlen,
 777                                      start, offset, grc, nopartial);
 778
 779         skb->remcsum_offload = 1;
 780
 781         return vh;
 782 }
 783
 784 static struct sk_buff *vxlan_gro_receive(struct sock *sk,
 785                                          struct list_head *head,
 786                                          struct sk_buff *skb)
 787 {
 788         struct sk_buff *pp = NULL;
 789         struct sk_buff *p;
 790         struct vxlanhdr *vh, *vh2;
 791         unsigned int hlen, off_vx;
 792         int flush = 1;
 793         struct vxlan_sock *vs = rcu_dereference_sk_user_data(sk);
 794         __be32 flags;
 795         struct gro_remcsum grc;
 796
 797         skb_gro_remcsum_init(&grc);
 798
 799         off_vx = skb_gro_offset(skb);
 800         hlen = off_vx + sizeof(*vh);
 801         vh   = skb_gro_header_fast(skb, off_vx);
 802         if (skb_gro_header_hard(skb, hlen)) {
 803                 vh = skb_gro_header_slow(skb, hlen, off_vx);
 804                 if (unlikely(!vh))
 805                         goto out;
 806         }
 807
 808         skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
 809
 810         flags = vh->vx_flags;
 811
 812         if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
 813                 vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
 814                                        vh->vx_vni, &grc,
 815                                        !!(vs->flags &
 816                                           VXLAN_F_REMCSUM_NOPARTIAL));
 817
 818                 if (!vh)
 819                         goto out;
 820         }
 821
 822         skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
 823
 824         list_for_each_entry(p, head, list) {
 825                 if (!NAPI_GRO_CB(p)->same_flow)
 826                         continue;
 827
 828                 vh2 = (struct vxlanhdr *)(p->data + off_vx);
 829                 if (vh->vx_flags != vh2->vx_flags ||
 830                     vh->vx_vni != vh2->vx_vni) {
 831                         NAPI_GRO_CB(p)->same_flow = 0;
 832                         continue;
 833                 }
 834         }
 835
 836         pp = call_gro_receive(eth_gro_receive, head, skb);
 837         flush = 0;
 838
 839 out:
 840         skb_gro_flush_final_remcsum(skb, pp, flush, &grc);
 841
 842         return pp;
 843 }
 844
 845 static int vxlan_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff)
 846 {
 847         /* Sets 'skb->inner_mac_header' since we are always called with
 848          * 'skb->encapsulation' set.
 849          */
 850         return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
 851 }
 852
 853 static struct vxlan_fdb *vxlan_fdb_alloc(struct vxlan_dev *vxlan, const u8 *mac,
 854                                          __u16 state, __be32 src_vni,
 855                                          __u16 ndm_flags)
 856 {
 857         struct vxlan_fdb *f;
 858
 859         f = kmalloc(sizeof(*f), GFP_ATOMIC);
 860         if (!f)
 861                 return NULL;
 862         f->state = state;
 863         f->flags = ndm_flags;
 864         f->updated = f->used = jiffies;
 865         f->vni = src_vni;
 866         f->nh = NULL;
 867         RCU_INIT_POINTER(f->vdev, vxlan);
 868         INIT_LIST_HEAD(&f->nh_list);
 869         INIT_LIST_HEAD(&f->remotes);
 870         memcpy(f->eth_addr, mac, ETH_ALEN);
 871
 872         return f;
 873 }
 874
 875 static void vxlan_fdb_insert(struct vxlan_dev *vxlan, const u8 *mac,
 876                              __be32 src_vni, struct vxlan_fdb *f)
 877 {
 878         ++vxlan->addrcnt;
 879         hlist_add_head_rcu(&f->hlist,
 880                            vxlan_fdb_head(vxlan, mac, src_vni));
 881 }
 882
 883 static int vxlan_fdb_nh_update(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
 884                                u32 nhid, struct netlink_ext_ack *extack)
 885 {
 886         struct nexthop *old_nh = rtnl_dereference(fdb->nh);
 887         struct nexthop *nh;
 888         int err = -EINVAL;
 889
 890         if (old_nh && old_nh->id == nhid)
 891                 return 0;
 892
 893         nh = nexthop_find_by_id(vxlan->net, nhid);
 894         if (!nh) {
 895                 NL_SET_ERR_MSG(extack, "Nexthop id does not exist");
 896                 goto err_inval;
 897         }
 898
 899         if (nh) {
 900                 if (!nexthop_get(nh)) {
 901                         NL_SET_ERR_MSG(extack, "Nexthop has been deleted");
 902                         nh = NULL;
 903                         goto err_inval;
 904                 }
 905                 if (!nexthop_is_fdb(nh)) {
 906                         NL_SET_ERR_MSG(extack, "Nexthop is not a fdb nexthop");
 907                         goto err_inval;
 908                 }
 909
 910                 if (!nexthop_is_multipath(nh)) {
 911                         NL_SET_ERR_MSG(extack, "Nexthop is not a multipath group");
 912                         goto err_inval;
 913                 }
 914
 915                 /* check nexthop group family */
 916                 switch (vxlan->default_dst.remote_ip.sa.sa_family) {
 917                 case AF_INET:
 918                         if (!nexthop_has_v4(nh)) {
 919                                 err = -EAFNOSUPPORT;
 920                                 NL_SET_ERR_MSG(extack, "Nexthop group family not supported");
 921                                 goto err_inval;
 922                         }
 923                         break;
 924                 case AF_INET6:
 925                         if (nexthop_has_v4(nh)) {
 926                                 err = -EAFNOSUPPORT;
 927                                 NL_SET_ERR_MSG(extack, "Nexthop group family not supported");
 928                                 goto err_inval;
 929                         }
 930                 }
 931         }
 932
 933         if (old_nh) {
 934                 list_del_rcu(&fdb->nh_list);
 935                 nexthop_put(old_nh);
 936         }
 937         rcu_assign_pointer(fdb->nh, nh);
 938         list_add_tail_rcu(&fdb->nh_list, &nh->fdb_list);
 939         return 1;
 940
 941 err_inval:
 942         if (nh)
 943                 nexthop_put(nh);
 944         return err;
 945 }
 946
 947 static int vxlan_fdb_create(struct vxlan_dev *vxlan,
 948                             const u8 *mac, union vxlan_addr *ip,
 949                             __u16 state, __be16 port, __be32 src_vni,
 950                             __be32 vni, __u32 ifindex, __u16 ndm_flags,
 951                             u32 nhid, struct vxlan_fdb **fdb,
 952                             struct netlink_ext_ack *extack)
 953 {
 954         struct vxlan_rdst *rd = NULL;
 955         struct vxlan_fdb *f;
 956         int rc;
 957
 958         if (vxlan->cfg.addrmax &&
 959             vxlan->addrcnt >= vxlan->cfg.addrmax)
 960                 return -ENOSPC;
 961
 962         netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
 963         f = vxlan_fdb_alloc(vxlan, mac, state, src_vni, ndm_flags);
 964         if (!f)
 965                 return -ENOMEM;
 966
 967         if (nhid)
 968                 rc = vxlan_fdb_nh_update(vxlan, f, nhid, extack);
 969         else
 970                 rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
 971         if (rc < 0)
 972                 goto errout;
 973
 974         *fdb = f;
 975
 976         return 0;
 977
 978 errout:
 979         kfree(f);
 980         return rc;
 981 }
 982
 983 static void __vxlan_fdb_free(struct vxlan_fdb *f)
 984 {
 985         struct vxlan_rdst *rd, *nd;
 986         struct nexthop *nh;
 987
 988         nh = rcu_dereference_raw(f->nh);
 989         if (nh) {
 990                 rcu_assign_pointer(f->nh, NULL);
 991                 rcu_assign_pointer(f->vdev, NULL);
 992                 nexthop_put(nh);
 993         }
 994
 995         list_for_each_entry_safe(rd, nd, &f->remotes, list) {
 996                 dst_cache_destroy(&rd->dst_cache);
 997                 kfree(rd);
 998         }
 999         kfree(f);
1000 }
1001
1002 static void vxlan_fdb_free(struct rcu_head *head)
1003 {
1004         struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
1005
1006         __vxlan_fdb_free(f);
1007 }
1008
1009 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f,
1010                               bool do_notify, bool swdev_notify)
1011 {
1012         struct vxlan_rdst *rd;
1013
1014         netdev_dbg(vxlan->dev, "delete %pM\n", f->eth_addr);
1015
1016         --vxlan->addrcnt;
1017         if (do_notify) {
1018                 if (rcu_access_pointer(f->nh))
1019                         vxlan_fdb_notify(vxlan, f, NULL, RTM_DELNEIGH,
1020                                          swdev_notify, NULL);
1021                 else
1022                         list_for_each_entry(rd, &f->remotes, list)
1023                                 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH,
1024                                                  swdev_notify, NULL);
1025         }
1026
1027         hlist_del_rcu(&f->hlist);
1028         list_del_rcu(&f->nh_list);
1029         call_rcu(&f->rcu, vxlan_fdb_free);
1030 }
1031
1032 static void vxlan_dst_free(struct rcu_head *head)
1033 {
1034         struct vxlan_rdst *rd = container_of(head, struct vxlan_rdst, rcu);
1035
1036         dst_cache_destroy(&rd->dst_cache);
1037         kfree(rd);
1038 }
1039
1040 static int vxlan_fdb_update_existing(struct vxlan_dev *vxlan,
1041                                      union vxlan_addr *ip,
1042                                      __u16 state, __u16 flags,
1043                                      __be16 port, __be32 vni,
1044                                      __u32 ifindex, __u16 ndm_flags,
1045                                      struct vxlan_fdb *f, u32 nhid,
1046                                      bool swdev_notify,
1047                                      struct netlink_ext_ack *extack)
1048 {
1049         __u16 fdb_flags = (ndm_flags & ~NTF_USE);
1050         struct vxlan_rdst *rd = NULL;
1051         struct vxlan_rdst oldrd;
1052         int notify = 0;
1053         int rc = 0;
1054         int err;
1055
1056         if (nhid && !rcu_access_pointer(f->nh)) {
1057                 NL_SET_ERR_MSG(extack,
1058                                "Cannot replace an existing non nexthop fdb with a nexthop");
1059                 return -EOPNOTSUPP;
1060         }
1061
1062         if (nhid && (flags & NLM_F_APPEND)) {
1063                 NL_SET_ERR_MSG(extack,
1064                                "Cannot append to a nexthop fdb");
1065                 return -EOPNOTSUPP;
1066         }
1067
1068         /* Do not allow an externally learned entry to take over an entry added
1069          * by the user.
1070          */
1071         if (!(fdb_flags & NTF_EXT_LEARNED) ||
1072             !(f->flags & NTF_VXLAN_ADDED_BY_USER)) {
1073                 if (f->state != state) {
1074                         f->state = state;
1075                         f->updated = jiffies;
1076                         notify = 1;
1077                 }
1078                 if (f->flags != fdb_flags) {
1079                         f->flags = fdb_flags;
1080                         f->updated = jiffies;
1081                         notify = 1;
1082                 }
1083         }
1084
1085         if ((flags & NLM_F_REPLACE)) {
1086                 /* Only change unicasts */
1087                 if (!(is_multicast_ether_addr(f->eth_addr) ||
1088                       is_zero_ether_addr(f->eth_addr))) {
1089                         if (nhid) {
1090                                 rc = vxlan_fdb_nh_update(vxlan, f, nhid, extack);
1091                                 if (rc < 0)
1092                                         return rc;
1093                         } else {
1094                                 rc = vxlan_fdb_replace(f, ip, port, vni,
1095                                                        ifindex, &oldrd);
1096                         }
1097                         notify |= rc;
1098                 } else {
1099                         NL_SET_ERR_MSG(extack, "Cannot replace non-unicast fdb entries");
1100                         return -EOPNOTSUPP;
1101                 }
1102         }
1103         if ((flags & NLM_F_APPEND) &&
1104             (is_multicast_ether_addr(f->eth_addr) ||
1105              is_zero_ether_addr(f->eth_addr))) {
1106                 rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
1107
1108                 if (rc < 0)
1109                         return rc;
1110                 notify |= rc;
1111         }
1112
1113         if (ndm_flags & NTF_USE)
1114                 f->used = jiffies;
1115
1116         if (notify) {
1117                 if (rd == NULL)
1118                         rd = first_remote_rtnl(f);
1119
1120                 err = vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH,
1121                                        swdev_notify, extack);
1122                 if (err)
1123                         goto err_notify;
1124         }
1125
1126         return 0;
1127
1128 err_notify:
1129         if (nhid)
1130                 return err;
1131         if ((flags & NLM_F_REPLACE) && rc)
1132                 *rd = oldrd;
1133         else if ((flags & NLM_F_APPEND) && rc) {
1134                 list_del_rcu(&rd->list);
1135                 call_rcu(&rd->rcu, vxlan_dst_free);
1136         }
1137         return err;
1138 }
1139
1140 static int vxlan_fdb_update_create(struct vxlan_dev *vxlan,
1141                                    const u8 *mac, union vxlan_addr *ip,
1142                                    __u16 state, __u16 flags,
1143                                    __be16 port, __be32 src_vni, __be32 vni,
1144                                    __u32 ifindex, __u16 ndm_flags, u32 nhid,
1145                                    bool swdev_notify,
1146                                    struct netlink_ext_ack *extack)
1147 {
1148         __u16 fdb_flags = (ndm_flags & ~NTF_USE);
1149         struct vxlan_fdb *f;
1150         int rc;
1151
1152         /* Disallow replace to add a multicast entry */
1153         if ((flags & NLM_F_REPLACE) &&
1154             (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
1155                 return -EOPNOTSUPP;
1156
1157         netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
1158         rc = vxlan_fdb_create(vxlan, mac, ip, state, port, src_vni,
1159                               vni, ifindex, fdb_flags, nhid, &f, extack);
1160         if (rc < 0)
1161                 return rc;
1162
1163         vxlan_fdb_insert(vxlan, mac, src_vni, f);
1164         rc = vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_NEWNEIGH,
1165                               swdev_notify, extack);
1166         if (rc)
1167                 goto err_notify;
1168
1169         return 0;
1170
1171 err_notify:
1172         vxlan_fdb_destroy(vxlan, f, false, false);
1173         return rc;
1174 }
1175
1176 /* Add new entry to forwarding table -- assumes lock held */
1177 static int vxlan_fdb_update(struct vxlan_dev *vxlan,
1178                             const u8 *mac, union vxlan_addr *ip,
1179                             __u16 state, __u16 flags,
1180                             __be16 port, __be32 src_vni, __be32 vni,
1181                             __u32 ifindex, __u16 ndm_flags, u32 nhid,
1182                             bool swdev_notify,
1183                             struct netlink_ext_ack *extack)
1184 {
1185         struct vxlan_fdb *f;
1186
1187         f = __vxlan_find_mac(vxlan, mac, src_vni);
1188         if (f) {
1189                 if (flags & NLM_F_EXCL) {
1190                         netdev_dbg(vxlan->dev,
1191                                    "lost race to create %pM\n", mac);
1192                         return -EEXIST;
1193                 }
1194
1195                 return vxlan_fdb_update_existing(vxlan, ip, state, flags, port,
1196                                                  vni, ifindex, ndm_flags, f,
1197                                                  nhid, swdev_notify, extack);
1198         } else {
1199                 if (!(flags & NLM_F_CREATE))
1200                         return -ENOENT;
1201
1202                 return vxlan_fdb_update_create(vxlan, mac, ip, state, flags,
1203                                                port, src_vni, vni, ifindex,
1204                                                ndm_flags, nhid, swdev_notify,
1205                                                extack);
1206         }
1207 }
1208
1209 static void vxlan_fdb_dst_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f,
1210                                   struct vxlan_rdst *rd, bool swdev_notify)
1211 {
1212         list_del_rcu(&rd->list);
1213         vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH, swdev_notify, NULL);
1214         call_rcu(&rd->rcu, vxlan_dst_free);
1215 }
1216
1217 static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
1218                            union vxlan_addr *ip, __be16 *port, __be32 *src_vni,
1219                            __be32 *vni, u32 *ifindex, u32 *nhid)
1220 {
1221         struct net *net = dev_net(vxlan->dev);
1222         int err;
1223
1224         if (tb[NDA_NH_ID] && (tb[NDA_DST] || tb[NDA_VNI] || tb[NDA_IFINDEX] ||
1225             tb[NDA_PORT]))
1226                 return -EINVAL;
1227
1228         if (tb[NDA_DST]) {
1229                 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
1230                 if (err)
1231                         return err;
1232         } else {
1233                 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
1234
1235                 if (remote->sa.sa_family == AF_INET) {
1236                         ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
1237                         ip->sa.sa_family = AF_INET;
1238 #if IS_ENABLED(CONFIG_IPV6)
1239                 } else {
1240                         ip->sin6.sin6_addr = in6addr_any;
1241                         ip->sa.sa_family = AF_INET6;
1242 #endif
1243                 }
1244         }
1245
1246         if (tb[NDA_PORT]) {
1247                 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
1248                         return -EINVAL;
1249                 *port = nla_get_be16(tb[NDA_PORT]);
1250         } else {
1251                 *port = vxlan->cfg.dst_port;
1252         }
1253
1254         if (tb[NDA_VNI]) {
1255                 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
1256                         return -EINVAL;
1257                 *vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
1258         } else {
1259                 *vni = vxlan->default_dst.remote_vni;
1260         }
1261
1262         if (tb[NDA_SRC_VNI]) {
1263                 if (nla_len(tb[NDA_SRC_VNI]) != sizeof(u32))
1264                         return -EINVAL;
1265                 *src_vni = cpu_to_be32(nla_get_u32(tb[NDA_SRC_VNI]));
1266         } else {
1267                 *src_vni = vxlan->default_dst.remote_vni;
1268         }
1269
1270         if (tb[NDA_IFINDEX]) {
1271                 struct net_device *tdev;
1272
1273                 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
1274                         return -EINVAL;
1275                 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
1276                 tdev = __dev_get_by_index(net, *ifindex);
1277                 if (!tdev)
1278                         return -EADDRNOTAVAIL;
1279         } else {
1280                 *ifindex = 0;
1281         }
1282
1283         if (tb[NDA_NH_ID])
1284                 *nhid = nla_get_u32(tb[NDA_NH_ID]);
1285         else
1286                 *nhid = 0;
1287
1288         return 0;
1289 }
1290
1291 /* Add static entry (via netlink) */
1292 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
1293                          struct net_device *dev,
1294                          const unsigned char *addr, u16 vid, u16 flags,
1295                          struct netlink_ext_ack *extack)
1296 {
1297         struct vxlan_dev *vxlan = netdev_priv(dev);
1298         /* struct net *net = dev_net(vxlan->dev); */
1299         union vxlan_addr ip;
1300         __be16 port;
1301         __be32 src_vni, vni;
1302         u32 ifindex, nhid;
1303         u32 hash_index;
1304         int err;
1305
1306         if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
1307                 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
1308                         ndm->ndm_state);
1309                 return -EINVAL;
1310         }
1311
1312         if (!tb || (!tb[NDA_DST] && !tb[NDA_NH_ID]))
1313                 return -EINVAL;
1314
1315         err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex,
1316                               &nhid);
1317         if (err)
1318                 return err;
1319
1320         if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
1321                 return -EAFNOSUPPORT;
1322
1323         hash_index = fdb_head_index(vxlan, addr, src_vni);
1324         spin_lock_bh(&vxlan->hash_lock[hash_index]);
1325         err = vxlan_fdb_update(vxlan, addr, &ip, ndm->ndm_state, flags,
1326                                port, src_vni, vni, ifindex,
1327                                ndm->ndm_flags | NTF_VXLAN_ADDED_BY_USER,
1328                                nhid, true, extack);
1329         spin_unlock_bh(&vxlan->hash_lock[hash_index]);
1330
1331         return err;
1332 }
1333
1334 static int __vxlan_fdb_delete(struct vxlan_dev *vxlan,
1335                               const unsigned char *addr, union vxlan_addr ip,
1336                               __be16 port, __be32 src_vni, __be32 vni,
1337                               u32 ifindex, bool swdev_notify)
1338 {
1339         struct vxlan_rdst *rd = NULL;
1340         struct vxlan_fdb *f;
1341         int err = -ENOENT;
1342
1343         f = vxlan_find_mac(vxlan, addr, src_vni);
1344         if (!f)
1345                 return err;
1346
1347         if (!vxlan_addr_any(&ip)) {
1348                 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
1349                 if (!rd)
1350                         goto out;
1351         }
1352
1353         /* remove a destination if it's not the only one on the list,
1354          * otherwise destroy the fdb entry
1355          */
1356         if (rd && !list_is_singular(&f->remotes)) {
1357                 vxlan_fdb_dst_destroy(vxlan, f, rd, swdev_notify);
1358                 goto out;
1359         }
1360
1361         vxlan_fdb_destroy(vxlan, f, true, swdev_notify);
1362
1363 out:
1364         return 0;
1365 }
1366
1367 /* Delete entry (via netlink) */
1368 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
1369                             struct net_device *dev,
1370                             const unsigned char *addr, u16 vid)
1371 {
1372         struct vxlan_dev *vxlan = netdev_priv(dev);
1373         union vxlan_addr ip;
1374         __be32 src_vni, vni;
1375         u32 ifindex, nhid;
1376         u32 hash_index;
1377         __be16 port;
1378         int err;
1379
1380         err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex,
1381                               &nhid);
1382         if (err)
1383                 return err;
1384
1385         hash_index = fdb_head_index(vxlan, addr, src_vni);
1386         spin_lock_bh(&vxlan->hash_lock[hash_index]);
1387         err = __vxlan_fdb_delete(vxlan, addr, ip, port, src_vni, vni, ifindex,
1388                                  true);
1389         spin_unlock_bh(&vxlan->hash_lock[hash_index]);
1390
1391         return err;
1392 }
1393
1394 /* Dump forwarding table */
1395 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
1396                           struct net_device *dev,
1397                           struct net_device *filter_dev, int *idx)
1398 {
1399         struct vxlan_dev *vxlan = netdev_priv(dev);
1400         unsigned int h;
1401         int err = 0;
1402
1403         for (h = 0; h < FDB_HASH_SIZE; ++h) {
1404                 struct vxlan_fdb *f;
1405
1406                 rcu_read_lock();
1407                 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
1408                         struct vxlan_rdst *rd;
1409
1410                         if (rcu_access_pointer(f->nh)) {
1411                                 if (*idx < cb->args[2])
1412                                         goto skip_nh;
1413                                 err = vxlan_fdb_info(skb, vxlan, f,
1414                                                      NETLINK_CB(cb->skb).portid,
1415                                                      cb->nlh->nlmsg_seq,
1416                                                      RTM_NEWNEIGH,
1417                                                      NLM_F_MULTI, NULL);
1418                                 if (err < 0) {
1419                                         rcu_read_unlock();
1420                                         goto out;
1421                                 }
1422 skip_nh:
1423                                 *idx += 1;
1424                                 continue;
1425                         }
1426
1427                         list_for_each_entry_rcu(rd, &f->remotes, list) {
1428                                 if (*idx < cb->args[2])
1429                                         goto skip;
1430
1431                                 err = vxlan_fdb_info(skb, vxlan, f,
1432                                                      NETLINK_CB(cb->skb).portid,
1433                                                      cb->nlh->nlmsg_seq,
1434                                                      RTM_NEWNEIGH,
1435                                                      NLM_F_MULTI, rd);
1436                                 if (err < 0) {
1437                                         rcu_read_unlock();
1438                                         goto out;
1439                                 }
1440 skip:
1441                                 *idx += 1;
1442                         }
1443                 }
1444                 rcu_read_unlock();
1445         }
1446 out:
1447         return err;
1448 }
1449
1450 static int vxlan_fdb_get(struct sk_buff *skb,
1451                          struct nlattr *tb[],
1452                          struct net_device *dev,
1453                          const unsigned char *addr,
1454                          u16 vid, u32 portid, u32 seq,
1455                          struct netlink_ext_ack *extack)
1456 {
1457         struct vxlan_dev *vxlan = netdev_priv(dev);
1458         struct vxlan_fdb *f;
1459         __be32 vni;
1460         int err;
1461
1462         if (tb[NDA_VNI])
1463                 vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
1464         else
1465                 vni = vxlan->default_dst.remote_vni;
1466
1467         rcu_read_lock();
1468
1469         f = __vxlan_find_mac(vxlan, addr, vni);
1470         if (!f) {
1471                 NL_SET_ERR_MSG(extack, "Fdb entry not found");
1472                 err = -ENOENT;
1473                 goto errout;
1474         }
1475
1476         err = vxlan_fdb_info(skb, vxlan, f, portid, seq,
1477                              RTM_NEWNEIGH, 0, first_remote_rcu(f));
1478 errout:
1479         rcu_read_unlock();
1480         return err;
1481 }
1482
1483 /* Watch incoming packets to learn mapping between Ethernet address
1484  * and Tunnel endpoint.
1485  * Return true if packet is bogus and should be dropped.
1486  */
1487 static bool vxlan_snoop(struct net_device *dev,
1488                         union vxlan_addr *src_ip, const u8 *src_mac,
1489                         u32 src_ifindex, __be32 vni)
1490 {
1491         struct vxlan_dev *vxlan = netdev_priv(dev);
1492         struct vxlan_fdb *f;
1493         u32 ifindex = 0;
1494
1495 #if IS_ENABLED(CONFIG_IPV6)
1496         if (src_ip->sa.sa_family == AF_INET6 &&
1497             (ipv6_addr_type(&src_ip->sin6.sin6_addr) & IPV6_ADDR_LINKLOCAL))
1498                 ifindex = src_ifindex;
1499 #endif
1500
1501         f = vxlan_find_mac(vxlan, src_mac, vni);
1502         if (likely(f)) {
1503                 struct vxlan_rdst *rdst = first_remote_rcu(f);
1504
1505                 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip) &&
1506                            rdst->remote_ifindex == ifindex))
1507                         return false;
1508
1509                 /* Don't migrate static entries, drop packets */
1510                 if (f->state & (NUD_PERMANENT | NUD_NOARP))
1511                         return true;
1512
1513                 /* Don't override an fdb with nexthop with a learnt entry */
1514                 if (rcu_access_pointer(f->nh))
1515                         return true;
1516
1517                 if (net_ratelimit())
1518                         netdev_info(dev,
1519                                     "%pM migrated from %pIS to %pIS\n",
1520                                     src_mac, &rdst->remote_ip.sa, &src_ip->sa);
1521
1522                 rdst->remote_ip = *src_ip;
1523                 f->updated = jiffies;
1524                 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH, true, NULL);
1525         } else {
1526                 u32 hash_index = fdb_head_index(vxlan, src_mac, vni);
1527
1528                 /* learned new entry */
1529                 spin_lock(&vxlan->hash_lock[hash_index]);
1530
1531                 /* close off race between vxlan_flush and incoming packets */
1532                 if (netif_running(dev))
1533                         vxlan_fdb_update(vxlan, src_mac, src_ip,
1534                                          NUD_REACHABLE,
1535                                          NLM_F_EXCL|NLM_F_CREATE,
1536                                          vxlan->cfg.dst_port,
1537                                          vni,
1538                                          vxlan->default_dst.remote_vni,
1539                                          ifindex, NTF_SELF, 0, true, NULL);
1540                 spin_unlock(&vxlan->hash_lock[hash_index]);
1541         }
1542
1543         return false;
1544 }
1545
1546 /* See if multicast group is already in use by other ID */
1547 static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
1548 {
1549         struct vxlan_dev *vxlan;
1550         struct vxlan_sock *sock4;
1551 #if IS_ENABLED(CONFIG_IPV6)
1552         struct vxlan_sock *sock6;
1553 #endif
1554         unsigned short family = dev->default_dst.remote_ip.sa.sa_family;
1555
1556         sock4 = rtnl_dereference(dev->vn4_sock);
1557
1558         /* The vxlan_sock is only used by dev, leaving group has
1559          * no effect on other vxlan devices.
1560          */
1561         if (family == AF_INET && sock4 && refcount_read(&sock4->refcnt) == 1)
1562                 return false;
1563 #if IS_ENABLED(CONFIG_IPV6)
1564         sock6 = rtnl_dereference(dev->vn6_sock);
1565         if (family == AF_INET6 && sock6 && refcount_read(&sock6->refcnt) == 1)
1566                 return false;
1567 #endif
1568
1569         list_for_each_entry(vxlan, &vn->vxlan_list, next) {
1570                 if (!netif_running(vxlan->dev) || vxlan == dev)
1571                         continue;
1572
1573                 if (family == AF_INET &&
1574                     rtnl_dereference(vxlan->vn4_sock) != sock4)
1575                         continue;
1576 #if IS_ENABLED(CONFIG_IPV6)
1577                 if (family == AF_INET6 &&
1578                     rtnl_dereference(vxlan->vn6_sock) != sock6)
1579                         continue;
1580 #endif
1581
1582                 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
1583                                       &dev->default_dst.remote_ip))
1584                         continue;
1585
1586                 if (vxlan->default_dst.remote_ifindex !=
1587                     dev->default_dst.remote_ifindex)
1588                         continue;
1589
1590                 return true;
1591         }
1592
1593         return false;
1594 }
1595
1596 static bool __vxlan_sock_release_prep(struct vxlan_sock *vs)
1597 {
1598         struct vxlan_net *vn;
1599
1600         if (!vs)
1601                 return false;
1602         if (!refcount_dec_and_test(&vs->refcnt))
1603                 return false;
1604
1605         vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id);
1606         spin_lock(&vn->sock_lock);
1607         hlist_del_rcu(&vs->hlist);
1608         udp_tunnel_notify_del_rx_port(vs->sock,
1609                                       (vs->flags & VXLAN_F_GPE) ?
1610                                       UDP_TUNNEL_TYPE_VXLAN_GPE :
1611                                       UDP_TUNNEL_TYPE_VXLAN);
1612         spin_unlock(&vn->sock_lock);
1613
1614         return true;
1615 }
1616
1617 static void vxlan_sock_release(struct vxlan_dev *vxlan)
1618 {
1619         struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1620 #if IS_ENABLED(CONFIG_IPV6)
1621         struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1622
1623         RCU_INIT_POINTER(vxlan->vn6_sock, NULL);
1624 #endif
1625
1626         RCU_INIT_POINTER(vxlan->vn4_sock, NULL);
1627         synchronize_net();
1628
1629         vxlan_vs_del_dev(vxlan);
1630
1631         if (__vxlan_sock_release_prep(sock4)) {
1632                 udp_tunnel_sock_release(sock4->sock);
1633                 kfree(sock4);
1634         }
1635
1636 #if IS_ENABLED(CONFIG_IPV6)
1637         if (__vxlan_sock_release_prep(sock6)) {
1638                 udp_tunnel_sock_release(sock6->sock);
1639                 kfree(sock6);
1640         }
1641 #endif
1642 }
1643
1644 /* Update multicast group membership when first VNI on
1645  * multicast address is brought up
1646  */
1647 static int vxlan_igmp_join(struct vxlan_dev *vxlan)
1648 {
1649         struct sock *sk;
1650         union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1651         int ifindex = vxlan->default_dst.remote_ifindex;
1652         int ret = -EINVAL;
1653
1654         if (ip->sa.sa_family == AF_INET) {
1655                 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1656                 struct ip_mreqn mreq = {
1657                         .imr_multiaddr.s_addr   = ip->sin.sin_addr.s_addr,
1658                         .imr_ifindex            = ifindex,
1659                 };
1660
1661                 sk = sock4->sock->sk;
1662                 lock_sock(sk);
1663                 ret = ip_mc_join_group(sk, &mreq);
1664                 release_sock(sk);
1665 #if IS_ENABLED(CONFIG_IPV6)
1666         } else {
1667                 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1668
1669                 sk = sock6->sock->sk;
1670                 lock_sock(sk);
1671                 ret = ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1672                                                    &ip->sin6.sin6_addr);
1673                 release_sock(sk);
1674 #endif
1675         }
1676
1677         return ret;
1678 }
1679
1680 /* Inverse of vxlan_igmp_join when last VNI is brought down */
1681 static int vxlan_igmp_leave(struct vxlan_dev *vxlan)
1682 {
1683         struct sock *sk;
1684         union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1685         int ifindex = vxlan->default_dst.remote_ifindex;
1686         int ret = -EINVAL;
1687
1688         if (ip->sa.sa_family == AF_INET) {
1689                 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1690                 struct ip_mreqn mreq = {
1691                         .imr_multiaddr.s_addr   = ip->sin.sin_addr.s_addr,
1692                         .imr_ifindex            = ifindex,
1693                 };
1694
1695                 sk = sock4->sock->sk;
1696                 lock_sock(sk);
1697                 ret = ip_mc_leave_group(sk, &mreq);
1698                 release_sock(sk);
1699 #if IS_ENABLED(CONFIG_IPV6)
1700         } else {
1701                 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1702
1703                 sk = sock6->sock->sk;
1704                 lock_sock(sk);
1705                 ret = ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1706                                                    &ip->sin6.sin6_addr);
1707                 release_sock(sk);
1708 #endif
1709         }
1710
1711         return ret;
1712 }
1713
1714 static bool vxlan_remcsum(struct vxlanhdr *unparsed,
1715                           struct sk_buff *skb, u32 vxflags)
1716 {
1717         size_t start, offset;
1718
1719         if (!(unparsed->vx_flags & VXLAN_HF_RCO) || skb->remcsum_offload)
1720                 goto out;
1721
1722         start = vxlan_rco_start(unparsed->vx_vni);
1723         offset = start + vxlan_rco_offset(unparsed->vx_vni);
1724
1725         if (!pskb_may_pull(skb, offset + sizeof(u16)))
1726                 return false;
1727
1728         skb_remcsum_process(skb, (void *)(vxlan_hdr(skb) + 1), start, offset,
1729                             !!(vxflags & VXLAN_F_REMCSUM_NOPARTIAL));
1730 out:
1731         unparsed->vx_flags &= ~VXLAN_HF_RCO;
1732         unparsed->vx_vni &= VXLAN_VNI_MASK;
1733         return true;
1734 }
1735
1736 static void vxlan_parse_gbp_hdr(struct vxlanhdr *unparsed,
1737                                 struct sk_buff *skb, u32 vxflags,
1738                                 struct vxlan_metadata *md)
1739 {
1740         struct vxlanhdr_gbp *gbp = (struct vxlanhdr_gbp *)unparsed;
1741         struct metadata_dst *tun_dst;
1742
1743         if (!(unparsed->vx_flags & VXLAN_HF_GBP))
1744                 goto out;
1745
1746         md->gbp = ntohs(gbp->policy_id);
1747
1748         tun_dst = (struct metadata_dst *)skb_dst(skb);
1749         if (tun_dst) {
1750                 tun_dst->u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT;
1751                 tun_dst->u.tun_info.options_len = sizeof(*md);
1752         }
1753         if (gbp->dont_learn)
1754                 md->gbp |= VXLAN_GBP_DONT_LEARN;
1755
1756         if (gbp->policy_applied)
1757                 md->gbp |= VXLAN_GBP_POLICY_APPLIED;
1758
1759         /* In flow-based mode, GBP is carried in dst_metadata */
1760         if (!(vxflags & VXLAN_F_COLLECT_METADATA))
1761                 skb->mark = md->gbp;
1762 out:
1763         unparsed->vx_flags &= ~VXLAN_GBP_USED_BITS;
1764 }
1765
1766 static bool vxlan_set_mac(struct vxlan_dev *vxlan,
1767                           struct vxlan_sock *vs,
1768                           struct sk_buff *skb, __be32 vni)
1769 {
1770         union vxlan_addr saddr;
1771         u32 ifindex = skb->dev->ifindex;
1772
1773         skb_reset_mac_header(skb);
1774         skb->protocol = eth_type_trans(skb, vxlan->dev);
1775         skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1776
1777         /* Ignore packet loops (and multicast echo) */
1778         if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1779                 return false;
1780
1781         /* Ignore packets from invalid src-address */
1782         if (!is_valid_ether_addr(eth_hdr(skb)->h_source))
1783                 return false;
1784
1785         /* Get address from the outer IP header */
1786         if (vxlan_get_sk_family(vs) == AF_INET) {
1787                 saddr.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
1788                 saddr.sa.sa_family = AF_INET;
1789 #if IS_ENABLED(CONFIG_IPV6)
1790         } else {
1791                 saddr.sin6.sin6_addr = ipv6_hdr(skb)->saddr;
1792                 saddr.sa.sa_family = AF_INET6;
1793 #endif
1794         }
1795
1796         if ((vxlan->cfg.flags & VXLAN_F_LEARN) &&
1797             vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source, ifindex, vni))
1798                 return false;
1799
1800         return true;
1801 }
1802
1803 static bool vxlan_ecn_decapsulate(struct vxlan_sock *vs, void *oiph,
1804                                   struct sk_buff *skb)
1805 {
1806         int err = 0;
1807
1808         if (vxlan_get_sk_family(vs) == AF_INET)
1809                 err = IP_ECN_decapsulate(oiph, skb);
1810 #if IS_ENABLED(CONFIG_IPV6)
1811         else
1812                 err = IP6_ECN_decapsulate(oiph, skb);
1813 #endif
1814
1815         if (unlikely(err) && log_ecn_error) {
1816                 if (vxlan_get_sk_family(vs) == AF_INET)
1817                         net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1818                                              &((struct iphdr *)oiph)->saddr,
1819                                              ((struct iphdr *)oiph)->tos);
1820                 else
1821                         net_info_ratelimited("non-ECT from %pI6\n",
1822                                              &((struct ipv6hdr *)oiph)->saddr);
1823         }
1824         return err <= 1;
1825 }
1826
1827 /* Callback from net/ipv4/udp.c to receive packets */
1828 static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
1829 {
1830         struct vxlan_dev *vxlan;
1831         struct vxlan_sock *vs;
1832         struct vxlanhdr unparsed;
1833         struct vxlan_metadata _md;
1834         struct vxlan_metadata *md = &_md;
1835         __be16 protocol = htons(ETH_P_TEB);
1836         bool raw_proto = false;
1837         void *oiph;
1838         __be32 vni = 0;
1839
1840         /* Need UDP and VXLAN header to be present */
1841         if (!pskb_may_pull(skb, VXLAN_HLEN))
1842                 goto drop;
1843
1844         unparsed = *vxlan_hdr(skb);
1845         /* VNI flag always required to be set */
1846         if (!(unparsed.vx_flags & VXLAN_HF_VNI)) {
1847                 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1848                            ntohl(vxlan_hdr(skb)->vx_flags),
1849                            ntohl(vxlan_hdr(skb)->vx_vni));
1850                 /* Return non vxlan pkt */
1851                 goto drop;
1852         }
1853         unparsed.vx_flags &= ~VXLAN_HF_VNI;
1854         unparsed.vx_vni &= ~VXLAN_VNI_MASK;
1855
1856         vs = rcu_dereference_sk_user_data(sk);
1857         if (!vs)
1858                 goto drop;
1859
1860         vni = vxlan_vni(vxlan_hdr(skb)->vx_vni);
1861
1862         vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni);
1863         if (!vxlan)
1864                 goto drop;
1865
1866         /* For backwards compatibility, only allow reserved fields to be
1867          * used by VXLAN extensions if explicitly requested.
1868          */
1869         if (vs->flags & VXLAN_F_GPE) {
1870                 if (!vxlan_parse_gpe_proto(&unparsed, &protocol))
1871                         goto drop;
1872                 unparsed.vx_flags &= ~VXLAN_GPE_USED_BITS;
1873                 raw_proto = true;
1874         }
1875
1876         if (__iptunnel_pull_header(skb, VXLAN_HLEN, protocol, raw_proto,
1877                                    !net_eq(vxlan->net, dev_net(vxlan->dev))))
1878                 goto drop;
1879
1880         if (vs->flags & VXLAN_F_REMCSUM_RX)
1881                 if (unlikely(!vxlan_remcsum(&unparsed, skb, vs->flags)))
1882                         goto drop;
1883
1884         if (vxlan_collect_metadata(vs)) {
1885                 struct metadata_dst *tun_dst;
1886
1887                 tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), TUNNEL_KEY,
1888                                          key32_to_tunnel_id(vni), sizeof(*md));
1889
1890                 if (!tun_dst)
1891                         goto drop;
1892
1893                 md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
1894
1895                 skb_dst_set(skb, (struct dst_entry *)tun_dst);
1896         } else {
1897                 memset(md, 0, sizeof(*md));
1898         }
1899
1900         if (vs->flags & VXLAN_F_GBP)
1901                 vxlan_parse_gbp_hdr(&unparsed, skb, vs->flags, md);
1902         /* Note that GBP and GPE can never be active together. This is
1903          * ensured in vxlan_dev_configure.
1904          */
1905
1906         if (unparsed.vx_flags || unparsed.vx_vni) {
1907                 /* If there are any unprocessed flags remaining treat
1908                  * this as a malformed packet. This behavior diverges from
1909                  * VXLAN RFC (RFC7348) which stipulates that bits in reserved
1910                  * in reserved fields are to be ignored. The approach here
1911                  * maintains compatibility with previous stack code, and also
1912                  * is more robust and provides a little more security in
1913                  * adding extensions to VXLAN.
1914                  */
1915                 goto drop;
1916         }
1917
1918         if (!raw_proto) {
1919                 if (!vxlan_set_mac(vxlan, vs, skb, vni))
1920                         goto drop;
1921         } else {
1922                 skb_reset_mac_header(skb);
1923                 skb->dev = vxlan->dev;
1924                 skb->pkt_type = PACKET_HOST;
1925         }
1926
1927         oiph = skb_network_header(skb);
1928         skb_reset_network_header(skb);
1929
1930         if (!vxlan_ecn_decapsulate(vs, oiph, skb)) {
1931                 ++vxlan->dev->stats.rx_frame_errors;
1932                 ++vxlan->dev->stats.rx_errors;
1933                 goto drop;
1934         }
1935
1936         rcu_read_lock();
1937
1938         if (unlikely(!(vxlan->dev->flags & IFF_UP))) {
1939                 rcu_read_unlock();
1940                 atomic_long_inc(&vxlan->dev->rx_dropped);
1941                 goto drop;
1942         }
1943
1944         dev_sw_netstats_rx_add(vxlan->dev, skb->len);
1945         gro_cells_receive(&vxlan->gro_cells, skb);
1946
1947         rcu_read_unlock();
1948
1949         return 0;
1950
1951 drop:
1952         /* Consume bad packet */
1953         kfree_skb(skb);
1954         return 0;
1955 }
1956
1957 /* Callback from net/ipv{4,6}/udp.c to check that we have a VNI for errors */
1958 static int vxlan_err_lookup(struct sock *sk, struct sk_buff *skb)
1959 {
1960         struct vxlan_dev *vxlan;
1961         struct vxlan_sock *vs;
1962         struct vxlanhdr *hdr;
1963         __be32 vni;
1964
1965         if (!pskb_may_pull(skb, skb_transport_offset(skb) + VXLAN_HLEN))
1966                 return -EINVAL;
1967
1968         hdr = vxlan_hdr(skb);
1969
1970         if (!(hdr->vx_flags & VXLAN_HF_VNI))
1971                 return -EINVAL;
1972
1973         vs = rcu_dereference_sk_user_data(sk);
1974         if (!vs)
1975                 return -ENOENT;
1976
1977         vni = vxlan_vni(hdr->vx_vni);
1978         vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni);
1979         if (!vxlan)
1980                 return -ENOENT;
1981
1982         return 0;
1983 }
1984
1985 static int arp_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
1986 {
1987         struct vxlan_dev *vxlan = netdev_priv(dev);
1988         struct arphdr *parp;
1989         u8 *arpptr, *sha;
1990         __be32 sip, tip;
1991         struct neighbour *n;
1992
1993         if (dev->flags & IFF_NOARP)
1994                 goto out;
1995
1996         if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1997                 dev->stats.tx_dropped++;
1998                 goto out;
1999         }
2000         parp = arp_hdr(skb);
2001
2002         if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
2003              parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
2004             parp->ar_pro != htons(ETH_P_IP) ||
2005             parp->ar_op != htons(ARPOP_REQUEST) ||
2006             parp->ar_hln != dev->addr_len ||
2007             parp->ar_pln != 4)
2008                 goto out;
2009         arpptr = (u8 *)parp + sizeof(struct arphdr);
2010         sha = arpptr;
2011         arpptr += dev->addr_len;        /* sha */
2012         memcpy(&sip, arpptr, sizeof(sip));
2013         arpptr += sizeof(sip);
2014         arpptr += dev->addr_len;        /* tha */
2015         memcpy(&tip, arpptr, sizeof(tip));
2016
2017         if (ipv4_is_loopback(tip) ||
2018             ipv4_is_multicast(tip))
2019                 goto out;
2020
2021         n = neigh_lookup(&arp_tbl, &tip, dev);
2022
2023         if (n) {
2024                 struct vxlan_fdb *f;
2025                 struct sk_buff  *reply;
2026
2027                 if (!(n->nud_state & NUD_CONNECTED)) {
2028                         neigh_release(n);
2029                         goto out;
2030                 }
2031
2032                 f = vxlan_find_mac(vxlan, n->ha, vni);
2033                 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
2034                         /* bridge-local neighbor */
2035                         neigh_release(n);
2036                         goto out;
2037                 }
2038
2039                 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
2040                                 n->ha, sha);
2041
2042                 neigh_release(n);
2043
2044                 if (reply == NULL)
2045                         goto out;
2046
2047                 skb_reset_mac_header(reply);
2048                 __skb_pull(reply, skb_network_offset(reply));
2049                 reply->ip_summed = CHECKSUM_UNNECESSARY;
2050                 reply->pkt_type = PACKET_HOST;
2051
2052                 if (netif_rx_ni(reply) == NET_RX_DROP)
2053                         dev->stats.rx_dropped++;
2054         } else if (vxlan->cfg.flags & VXLAN_F_L3MISS) {
2055                 union vxlan_addr ipa = {
2056                         .sin.sin_addr.s_addr = tip,
2057                         .sin.sin_family = AF_INET,
2058                 };
2059
2060                 vxlan_ip_miss(dev, &ipa);
2061         }
2062 out:
2063         consume_skb(skb);
2064         return NETDEV_TX_OK;
2065 }
2066
2067 #if IS_ENABLED(CONFIG_IPV6)
2068 static struct sk_buff *vxlan_na_create(struct sk_buff *request,
2069         struct neighbour *n, bool isrouter)
2070 {
2071         struct net_device *dev = request->dev;
2072         struct sk_buff *reply;
2073         struct nd_msg *ns, *na;
2074         struct ipv6hdr *pip6;
2075         u8 *daddr;
2076         int na_olen = 8; /* opt hdr + ETH_ALEN for target */
2077         int ns_olen;
2078         int i, len;
2079
2080         if (dev == NULL || !pskb_may_pull(request, request->len))
2081                 return NULL;
2082
2083         len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
2084                 sizeof(*na) + na_olen + dev->needed_tailroom;
2085         reply = alloc_skb(len, GFP_ATOMIC);
2086         if (reply == NULL)
2087                 return NULL;
2088
2089         reply->protocol = htons(ETH_P_IPV6);
2090         reply->dev = dev;
2091         skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
2092         skb_push(reply, sizeof(struct ethhdr));
2093         skb_reset_mac_header(reply);
2094
2095         ns = (struct nd_msg *)(ipv6_hdr(request) + 1);
2096
2097         daddr = eth_hdr(request)->h_source;
2098         ns_olen = request->len - skb_network_offset(request) -
2099                 sizeof(struct ipv6hdr) - sizeof(*ns);
2100         for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
2101                 if (!ns->opt[i + 1]) {
2102                         kfree_skb(reply);
2103                         return NULL;
2104                 }
2105                 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
2106                         daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
2107                         break;
2108                 }
2109         }
2110
2111         /* Ethernet header */
2112         ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
2113         ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
2114         eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
2115         reply->protocol = htons(ETH_P_IPV6);
2116
2117         skb_pull(reply, sizeof(struct ethhdr));
2118         skb_reset_network_header(reply);
2119         skb_put(reply, sizeof(struct ipv6hdr));
2120
2121         /* IPv6 header */
2122
2123         pip6 = ipv6_hdr(reply);
2124         memset(pip6, 0, sizeof(struct ipv6hdr));
2125         pip6->version = 6;
2126         pip6->priority = ipv6_hdr(request)->priority;
2127         pip6->nexthdr = IPPROTO_ICMPV6;
2128         pip6->hop_limit = 255;
2129         pip6->daddr = ipv6_hdr(request)->saddr;
2130         pip6->saddr = *(struct in6_addr *)n->primary_key;
2131
2132         skb_pull(reply, sizeof(struct ipv6hdr));
2133         skb_reset_transport_header(reply);
2134
2135         /* Neighbor Advertisement */
2136         na = skb_put_zero(reply, sizeof(*na) + na_olen);
2137         na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
2138         na->icmph.icmp6_router = isrouter;
2139         na->icmph.icmp6_override = 1;
2140         na->icmph.icmp6_solicited = 1;
2141         na->target = ns->target;
2142         ether_addr_copy(&na->opt[2], n->ha);
2143         na->opt[0] = ND_OPT_TARGET_LL_ADDR;
2144         na->opt[1] = na_olen >> 3;
2145
2146         na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
2147                 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
2148                 csum_partial(na, sizeof(*na)+na_olen, 0));
2149
2150         pip6->payload_len = htons(sizeof(*na)+na_olen);
2151
2152         skb_push(reply, sizeof(struct ipv6hdr));
2153
2154         reply->ip_summed = CHECKSUM_UNNECESSARY;
2155
2156         return reply;
2157 }
2158
2159 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
2160 {
2161         struct vxlan_dev *vxlan = netdev_priv(dev);
2162         const struct in6_addr *daddr;
2163         const struct ipv6hdr *iphdr;
2164         struct inet6_dev *in6_dev;
2165         struct neighbour *n;
2166         struct nd_msg *msg;
2167
2168         rcu_read_lock();
2169         in6_dev = __in6_dev_get(dev);
2170         if (!in6_dev)
2171                 goto out;
2172
2173         iphdr = ipv6_hdr(skb);
2174         daddr = &iphdr->daddr;
2175         msg = (struct nd_msg *)(iphdr + 1);
2176
2177         if (ipv6_addr_loopback(daddr) ||
2178             ipv6_addr_is_multicast(&msg->target))
2179                 goto out;
2180
2181         n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
2182
2183         if (n) {
2184                 struct vxlan_fdb *f;
2185                 struct sk_buff *reply;
2186
2187                 if (!(n->nud_state & NUD_CONNECTED)) {
2188                         neigh_release(n);
2189                         goto out;
2190                 }
2191
2192                 f = vxlan_find_mac(vxlan, n->ha, vni);
2193                 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
2194                         /* bridge-local neighbor */
2195                         neigh_release(n);
2196                         goto out;
2197                 }
2198
2199                 reply = vxlan_na_create(skb, n,
2200                                         !!(f ? f->flags & NTF_ROUTER : 0));
2201
2202                 neigh_release(n);
2203
2204                 if (reply == NULL)
2205                         goto out;
2206
2207                 if (netif_rx_ni(reply) == NET_RX_DROP)
2208                         dev->stats.rx_dropped++;
2209
2210         } else if (vxlan->cfg.flags & VXLAN_F_L3MISS) {
2211                 union vxlan_addr ipa = {
2212                         .sin6.sin6_addr = msg->target,
2213                         .sin6.sin6_family = AF_INET6,
2214                 };
2215
2216                 vxlan_ip_miss(dev, &ipa);
2217         }
2218
2219 out:
2220         rcu_read_unlock();
2221         consume_skb(skb);
2222         return NETDEV_TX_OK;
2223 }
2224 #endif
2225
2226 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
2227 {
2228         struct vxlan_dev *vxlan = netdev_priv(dev);
2229         struct neighbour *n;
2230
2231         if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
2232                 return false;
2233
2234         n = NULL;
2235         switch (ntohs(eth_hdr(skb)->h_proto)) {
2236         case ETH_P_IP:
2237         {
2238                 struct iphdr *pip;
2239
2240                 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
2241                         return false;
2242                 pip = ip_hdr(skb);
2243                 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
2244                 if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) {
2245                         union vxlan_addr ipa = {
2246                                 .sin.sin_addr.s_addr = pip->daddr,
2247                                 .sin.sin_family = AF_INET,
2248                         };
2249
2250                         vxlan_ip_miss(dev, &ipa);
2251                         return false;
2252                 }
2253
2254                 break;
2255         }
2256 #if IS_ENABLED(CONFIG_IPV6)
2257         case ETH_P_IPV6:
2258         {
2259                 struct ipv6hdr *pip6;
2260
2261                 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
2262                         return false;
2263                 pip6 = ipv6_hdr(skb);
2264                 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
2265                 if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) {
2266                         union vxlan_addr ipa = {
2267                                 .sin6.sin6_addr = pip6->daddr,
2268                                 .sin6.sin6_family = AF_INET6,
2269                         };
2270
2271                         vxlan_ip_miss(dev, &ipa);
2272                         return false;
2273                 }
2274
2275                 break;
2276         }
2277 #endif
2278         default:
2279                 return false;
2280         }
2281
2282         if (n) {
2283                 bool diff;
2284
2285                 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
2286                 if (diff) {
2287                         memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
2288                                 dev->addr_len);
2289                         memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
2290                 }
2291                 neigh_release(n);
2292                 return diff;
2293         }
2294
2295         return false;
2296 }
2297
2298 static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
2299                                 struct vxlan_metadata *md)
2300 {
2301         struct vxlanhdr_gbp *gbp;
2302
2303         if (!md->gbp)
2304                 return;
2305
2306         gbp = (struct vxlanhdr_gbp *)vxh;
2307         vxh->vx_flags |= VXLAN_HF_GBP;
2308
2309         if (md->gbp & VXLAN_GBP_DONT_LEARN)
2310                 gbp->dont_learn = 1;
2311
2312         if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
2313                 gbp->policy_applied = 1;
2314
2315         gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
2316 }
2317
2318 static int vxlan_build_gpe_hdr(struct vxlanhdr *vxh, u32 vxflags,
2319                                __be16 protocol)
2320 {
2321         struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)vxh;
2322
2323         gpe->np_applied = 1;
2324         gpe->next_protocol = tun_p_from_eth_p(protocol);
2325         if (!gpe->next_protocol)
2326                 return -EPFNOSUPPORT;
2327         return 0;
2328 }
2329
2330 static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst,
2331                            int iphdr_len, __be32 vni,
2332                            struct vxlan_metadata *md, u32 vxflags,
2333                            bool udp_sum)
2334 {
2335         struct vxlanhdr *vxh;
2336         int min_headroom;
2337         int err;
2338         int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
2339         __be16 inner_protocol = htons(ETH_P_TEB);
2340
2341         if ((vxflags & VXLAN_F_REMCSUM_TX) &&
2342             skb->ip_summed == CHECKSUM_PARTIAL) {
2343                 int csum_start = skb_checksum_start_offset(skb);
2344
2345                 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
2346                     !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
2347                     (skb->csum_offset == offsetof(struct udphdr, check) ||
2348                      skb->csum_offset == offsetof(struct tcphdr, check)))
2349                         type |= SKB_GSO_TUNNEL_REMCSUM;
2350         }
2351
2352         min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
2353                         + VXLAN_HLEN + iphdr_len;
2354
2355         /* Need space for new headers (invalidates iph ptr) */
2356         err = skb_cow_head(skb, min_headroom);
2357         if (unlikely(err))
2358                 return err;
2359
2360         err = iptunnel_handle_offloads(skb, type);
2361         if (err)
2362                 return err;
2363
2364         vxh = __skb_push(skb, sizeof(*vxh));
2365         vxh->vx_flags = VXLAN_HF_VNI;
2366         vxh->vx_vni = vxlan_vni_field(vni);
2367
2368         if (type & SKB_GSO_TUNNEL_REMCSUM) {
2369                 unsigned int start;
2370
2371                 start = skb_checksum_start_offset(skb) - sizeof(struct vxlanhdr);
2372                 vxh->vx_vni |= vxlan_compute_rco(start, skb->csum_offset);
2373                 vxh->vx_flags |= VXLAN_HF_RCO;
2374
2375                 if (!skb_is_gso(skb)) {
2376                         skb->ip_summed = CHECKSUM_NONE;
2377                         skb->encapsulation = 0;
2378                 }
2379         }
2380
2381         if (vxflags & VXLAN_F_GBP)
2382                 vxlan_build_gbp_hdr(vxh, vxflags, md);
2383         if (vxflags & VXLAN_F_GPE) {
2384                 err = vxlan_build_gpe_hdr(vxh, vxflags, skb->protocol);
2385                 if (err < 0)
2386                         return err;
2387                 inner_protocol = skb->protocol;
2388         }
2389
2390         skb_set_inner_protocol(skb, inner_protocol);
2391         return 0;
2392 }
2393
2394 static struct rtable *vxlan_get_route(struct vxlan_dev *vxlan, struct net_device *dev,
2395                                       struct vxlan_sock *sock4,
2396                                       struct sk_buff *skb, int oif, u8 tos,
2397                                       __be32 daddr, __be32 *saddr, __be16 dport, __be16 sport,
2398                                       struct dst_cache *dst_cache,
2399                                       const struct ip_tunnel_info *info)
2400 {
2401         bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
2402         struct rtable *rt = NULL;
2403         struct flowi4 fl4;
2404
2405         if (!sock4)
2406                 return ERR_PTR(-EIO);
2407
2408         if (tos && !info)
2409                 use_cache = false;
2410         if (use_cache) {
2411                 rt = dst_cache_get_ip4(dst_cache, saddr);
2412                 if (rt)
2413                         return rt;
2414         }
2415
2416         memset(&fl4, 0, sizeof(fl4));
2417         fl4.flowi4_oif = oif;
2418         fl4.flowi4_tos = RT_TOS(tos);
2419         fl4.flowi4_mark = skb->mark;
2420         fl4.flowi4_proto = IPPROTO_UDP;
2421         fl4.daddr = daddr;
2422         fl4.saddr = *saddr;
2423         fl4.fl4_dport = dport;
2424         fl4.fl4_sport = sport;
2425
2426         rt = ip_route_output_key(vxlan->net, &fl4);
2427         if (!IS_ERR(rt)) {
2428                 if (rt->dst.dev == dev) {
2429                         netdev_dbg(dev, "circular route to %pI4\n", &daddr);
2430                         ip_rt_put(rt);
2431                         return ERR_PTR(-ELOOP);
2432                 }
2433
2434                 *saddr = fl4.saddr;
2435                 if (use_cache)
2436                         dst_cache_set_ip4(dst_cache, &rt->dst, fl4.saddr);
2437         } else {
2438                 netdev_dbg(dev, "no route to %pI4\n", &daddr);
2439                 return ERR_PTR(-ENETUNREACH);
2440         }
2441         return rt;
2442 }
2443
2444 #if IS_ENABLED(CONFIG_IPV6)
2445 static struct dst_entry *vxlan6_get_route(struct vxlan_dev *vxlan,
2446                                           struct net_device *dev,
2447                                           struct vxlan_sock *sock6,
2448                                           struct sk_buff *skb, int oif, u8 tos,
2449                                           __be32 label,
2450                                           const struct in6_addr *daddr,
2451                                           struct in6_addr *saddr,
2452                                           __be16 dport, __be16 sport,
2453                                           struct dst_cache *dst_cache,
2454                                           const struct ip_tunnel_info *info)
2455 {
2456         bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
2457         struct dst_entry *ndst;
2458         struct flowi6 fl6;
2459
2460         if (!sock6)
2461                 return ERR_PTR(-EIO);
2462
2463         if (tos && !info)
2464                 use_cache = false;
2465         if (use_cache) {
2466                 ndst = dst_cache_get_ip6(dst_cache, saddr);
2467                 if (ndst)
2468                         return ndst;
2469         }
2470
2471         memset(&fl6, 0, sizeof(fl6));
2472         fl6.flowi6_oif = oif;
2473         fl6.daddr = *daddr;
2474         fl6.saddr = *saddr;
2475         fl6.flowlabel = ip6_make_flowinfo(RT_TOS(tos), label);
2476         fl6.flowi6_mark = skb->mark;
2477         fl6.flowi6_proto = IPPROTO_UDP;
2478         fl6.fl6_dport = dport;
2479         fl6.fl6_sport = sport;
2480
2481         ndst = ipv6_stub->ipv6_dst_lookup_flow(vxlan->net, sock6->sock->sk,
2482                                                &fl6, NULL);
2483         if (unlikely(IS_ERR(ndst))) {
2484                 netdev_dbg(dev, "no route to %pI6\n", daddr);
2485                 return ERR_PTR(-ENETUNREACH);
2486         }
2487
2488         if (unlikely(ndst->dev == dev)) {
2489                 netdev_dbg(dev, "circular route to %pI6\n", daddr);
2490                 dst_release(ndst);
2491                 return ERR_PTR(-ELOOP);
2492         }
2493
2494         *saddr = fl6.saddr;
2495         if (use_cache)
2496                 dst_cache_set_ip6(dst_cache, ndst, saddr);
2497         return ndst;
2498 }
2499 #endif
2500
2501 /* Bypass encapsulation if the destination is local */
2502 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
2503                                struct vxlan_dev *dst_vxlan, __be32 vni,
2504                                bool snoop)
2505 {
2506         struct pcpu_sw_netstats *tx_stats, *rx_stats;
2507         union vxlan_addr loopback;
2508         union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
2509         struct net_device *dev;
2510         int len = skb->len;
2511
2512         tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
2513         rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
2514         skb->pkt_type = PACKET_HOST;
2515         skb->encapsulation = 0;
2516         skb->dev = dst_vxlan->dev;
2517         __skb_pull(skb, skb_network_offset(skb));
2518
2519         if (remote_ip->sa.sa_family == AF_INET) {
2520                 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
2521                 loopback.sa.sa_family =  AF_INET;
2522 #if IS_ENABLED(CONFIG_IPV6)
2523         } else {
2524                 loopback.sin6.sin6_addr = in6addr_loopback;
2525                 loopback.sa.sa_family =  AF_INET6;
2526 #endif
2527         }
2528
2529         rcu_read_lock();
2530         dev = skb->dev;
2531         if (unlikely(!(dev->flags & IFF_UP))) {
2532                 kfree_skb(skb);
2533                 goto drop;
2534         }
2535
2536         if ((dst_vxlan->cfg.flags & VXLAN_F_LEARN) && snoop)
2537                 vxlan_snoop(dev, &loopback, eth_hdr(skb)->h_source, 0, vni);
2538
2539         u64_stats_update_begin(&tx_stats->syncp);
2540         tx_stats->tx_packets++;
2541         tx_stats->tx_bytes += len;
2542         u64_stats_update_end(&tx_stats->syncp);
2543
2544         if (netif_rx(skb) == NET_RX_SUCCESS) {
2545                 u64_stats_update_begin(&rx_stats->syncp);
2546                 rx_stats->rx_packets++;
2547                 rx_stats->rx_bytes += len;
2548                 u64_stats_update_end(&rx_stats->syncp);
2549         } else {
2550 drop:
2551                 dev->stats.rx_dropped++;
2552         }
2553         rcu_read_unlock();
2554 }
2555
2556 static int encap_bypass_if_local(struct sk_buff *skb, struct net_device *dev,
2557                                  struct vxlan_dev *vxlan,
2558                                  union vxlan_addr *daddr,
2559                                  __be16 dst_port, int dst_ifindex, __be32 vni,
2560                                  struct dst_entry *dst,
2561                                  u32 rt_flags)
2562 {
2563 #if IS_ENABLED(CONFIG_IPV6)
2564         /* IPv6 rt-flags are checked against RTF_LOCAL, but the value of
2565          * RTF_LOCAL is equal to RTCF_LOCAL. So to keep code simple
2566          * we can use RTCF_LOCAL which works for ipv4 and ipv6 route entry.
2567          */
2568         BUILD_BUG_ON(RTCF_LOCAL != RTF_LOCAL);
2569 #endif
2570         /* Bypass encapsulation if the destination is local */
2571         if (rt_flags & RTCF_LOCAL &&
2572             !(rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2573                 struct vxlan_dev *dst_vxlan;
2574
2575                 dst_release(dst);
2576                 dst_vxlan = vxlan_find_vni(vxlan->net, dst_ifindex, vni,
2577                                            daddr->sa.sa_family, dst_port,
2578                                            vxlan->cfg.flags);
2579                 if (!dst_vxlan) {
2580                         dev->stats.tx_errors++;
2581                         kfree_skb(skb);
2582
2583                         return -ENOENT;
2584                 }
2585                 vxlan_encap_bypass(skb, vxlan, dst_vxlan, vni, true);
2586                 return 1;
2587         }
2588
2589         return 0;
2590 }
2591
2592 static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
2593                            __be32 default_vni, struct vxlan_rdst *rdst,
2594                            bool did_rsc)
2595 {
2596         struct dst_cache *dst_cache;
2597         struct ip_tunnel_info *info;
2598         struct vxlan_dev *vxlan = netdev_priv(dev);
2599         const struct iphdr *old_iph = ip_hdr(skb);
2600         union vxlan_addr *dst;
2601         union vxlan_addr remote_ip, local_ip;
2602         struct vxlan_metadata _md;
2603         struct vxlan_metadata *md = &_md;
2604         __be16 src_port = 0, dst_port;
2605         struct dst_entry *ndst = NULL;
2606         __be32 vni, label;
2607         __u8 tos, ttl;
2608         int ifindex;
2609         int err;
2610         u32 flags = vxlan->cfg.flags;
2611         bool udp_sum = false;
2612         bool xnet = !net_eq(vxlan->net, dev_net(vxlan->dev));
2613
2614         info = skb_tunnel_info(skb);
2615
2616         if (rdst) {
2617                 dst = &rdst->remote_ip;
2618                 if (vxlan_addr_any(dst)) {
2619                         if (did_rsc) {
2620                                 /* short-circuited back to local bridge */
2621                                 vxlan_encap_bypass(skb, vxlan, vxlan,
2622                                                    default_vni, true);
2623                                 return;
2624                         }
2625                         goto drop;
2626                 }
2627
2628                 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port;
2629                 vni = (rdst->remote_vni) ? : default_vni;
2630                 ifindex = rdst->remote_ifindex;
2631                 local_ip = vxlan->cfg.saddr;
2632                 dst_cache = &rdst->dst_cache;
2633                 md->gbp = skb->mark;
2634                 if (flags & VXLAN_F_TTL_INHERIT) {
2635                         ttl = ip_tunnel_get_ttl(old_iph, skb);
2636                 } else {
2637                         ttl = vxlan->cfg.ttl;
2638                         if (!ttl && vxlan_addr_multicast(dst))
2639                                 ttl = 1;
2640                 }
2641
2642                 tos = vxlan->cfg.tos;
2643                 if (tos == 1)
2644                         tos = ip_tunnel_get_dsfield(old_iph, skb);
2645
2646                 if (dst->sa.sa_family == AF_INET)
2647                         udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM_TX);
2648                 else
2649                         udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX);
2650                 label = vxlan->cfg.label;
2651         } else {
2652                 if (!info) {
2653                         WARN_ONCE(1, "%s: Missing encapsulation instructions\n",
2654                                   dev->name);
2655                         goto drop;
2656                 }
2657                 remote_ip.sa.sa_family = ip_tunnel_info_af(info);
2658                 if (remote_ip.sa.sa_family == AF_INET) {
2659                         remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst;
2660                         local_ip.sin.sin_addr.s_addr = info->key.u.ipv4.src;
2661                 } else {
2662                         remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst;
2663                         local_ip.sin6.sin6_addr = info->key.u.ipv6.src;
2664                 }
2665                 dst = &remote_ip;
2666                 dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port;
2667                 vni = tunnel_id_to_key32(info->key.tun_id);
2668                 ifindex = 0;
2669                 dst_cache = &info->dst_cache;
2670                 if (info->key.tun_flags & TUNNEL_VXLAN_OPT) {
2671                         if (info->options_len < sizeof(*md))
2672                                 goto drop;
2673                         md = ip_tunnel_info_opts(info);
2674                 }
2675                 ttl = info->key.ttl;
2676                 tos = info->key.tos;
2677                 label = info->key.label;
2678                 udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
2679         }
2680         src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2681                                      vxlan->cfg.port_max, true);
2682
2683         rcu_read_lock();
2684         if (dst->sa.sa_family == AF_INET) {
2685                 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
2686                 struct rtable *rt;
2687                 __be16 df = 0;
2688
2689                 if (!ifindex)
2690                         ifindex = sock4->sock->sk->sk_bound_dev_if;
2691
2692                 rt = vxlan_get_route(vxlan, dev, sock4, skb, ifindex, tos,
2693                                      dst->sin.sin_addr.s_addr,
2694                                      &local_ip.sin.sin_addr.s_addr,
2695                                      dst_port, src_port,
2696                                      dst_cache, info);
2697                 if (IS_ERR(rt)) {
2698                         err = PTR_ERR(rt);
2699                         goto tx_error;
2700                 }
2701
2702                 if (!info) {
2703                         /* Bypass encapsulation if the destination is local */
2704                         err = encap_bypass_if_local(skb, dev, vxlan, dst,
2705                                                     dst_port, ifindex, vni,
2706                                                     &rt->dst, rt->rt_flags);
2707                         if (err)
2708                                 goto out_unlock;
2709
2710                         if (vxlan->cfg.df == VXLAN_DF_SET) {
2711                                 df = htons(IP_DF);
2712                         } else if (vxlan->cfg.df == VXLAN_DF_INHERIT) {
2713                                 struct ethhdr *eth = eth_hdr(skb);
2714
2715                                 if (ntohs(eth->h_proto) == ETH_P_IPV6 ||
2716                                     (ntohs(eth->h_proto) == ETH_P_IP &&
2717                                      old_iph->frag_off & htons(IP_DF)))
2718                                         df = htons(IP_DF);
2719                         }
2720                 } else if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT) {
2721                         df = htons(IP_DF);
2722                 }
2723
2724                 ndst = &rt->dst;
2725                 err = skb_tunnel_check_pmtu(skb, ndst, vxlan_headroom(flags & VXLAN_F_GPE),
2726                                             netif_is_any_bridge_port(dev));
2727                 if (err < 0) {
2728                         goto tx_error;
2729                 } else if (err) {
2730                         if (info) {
2731                                 struct ip_tunnel_info *unclone;
2732                                 struct in_addr src, dst;
2733
2734                                 unclone = skb_tunnel_info_unclone(skb);
2735                                 if (unlikely(!unclone))
2736                                         goto tx_error;
2737
2738                                 src = remote_ip.sin.sin_addr;
2739                                 dst = local_ip.sin.sin_addr;
2740                                 unclone->key.u.ipv4.src = src.s_addr;
2741                                 unclone->key.u.ipv4.dst = dst.s_addr;
2742                         }
2743                         vxlan_encap_bypass(skb, vxlan, vxlan, vni, false);
2744                         dst_release(ndst);
2745                         goto out_unlock;
2746                 }
2747
2748                 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2749                 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
2750                 err = vxlan_build_skb(skb, ndst, sizeof(struct iphdr),
2751                                       vni, md, flags, udp_sum);
2752                 if (err < 0)
2753                         goto tx_error;
2754
2755                 udp_tunnel_xmit_skb(rt, sock4->sock->sk, skb, local_ip.sin.sin_addr.s_addr,
2756                                     dst->sin.sin_addr.s_addr, tos, ttl, df,
2757                                     src_port, dst_port, xnet, !udp_sum);
2758 #if IS_ENABLED(CONFIG_IPV6)
2759         } else {
2760                 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
2761
2762                 if (!ifindex)
2763                         ifindex = sock6->sock->sk->sk_bound_dev_if;
2764
2765                 ndst = vxlan6_get_route(vxlan, dev, sock6, skb, ifindex, tos,
2766                                         label, &dst->sin6.sin6_addr,
2767                                         &local_ip.sin6.sin6_addr,
2768                                         dst_port, src_port,
2769                                         dst_cache, info);
2770                 if (IS_ERR(ndst)) {
2771                         err = PTR_ERR(ndst);
2772                         ndst = NULL;
2773                         goto tx_error;
2774                 }
2775
2776                 if (!info) {
2777                         u32 rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags;
2778
2779                         err = encap_bypass_if_local(skb, dev, vxlan, dst,
2780                                                     dst_port, ifindex, vni,
2781                                                     ndst, rt6i_flags);
2782                         if (err)
2783                                 goto out_unlock;
2784                 }
2785
2786                 err = skb_tunnel_check_pmtu(skb, ndst,
2787                                             vxlan_headroom((flags & VXLAN_F_GPE) | VXLAN_F_IPV6),
2788                                             netif_is_any_bridge_port(dev));
2789                 if (err < 0) {
2790                         goto tx_error;
2791                 } else if (err) {
2792                         if (info) {
2793                                 struct ip_tunnel_info *unclone;
2794                                 struct in6_addr src, dst;
2795
2796                                 unclone = skb_tunnel_info_unclone(skb);
2797                                 if (unlikely(!unclone))
2798                                         goto tx_error;
2799
2800                                 src = remote_ip.sin6.sin6_addr;
2801                                 dst = local_ip.sin6.sin6_addr;
2802                                 unclone->key.u.ipv6.src = src;
2803                                 unclone->key.u.ipv6.dst = dst;
2804                         }
2805
2806                         vxlan_encap_bypass(skb, vxlan, vxlan, vni, false);
2807                         dst_release(ndst);
2808                         goto out_unlock;
2809                 }
2810
2811                 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2812                 ttl = ttl ? : ip6_dst_hoplimit(ndst);
2813                 skb_scrub_packet(skb, xnet);
2814                 err = vxlan_build_skb(skb, ndst, sizeof(struct ipv6hdr),
2815                                       vni, md, flags, udp_sum);
2816                 if (err < 0)
2817                         goto tx_error;
2818
2819                 udp_tunnel6_xmit_skb(ndst, sock6->sock->sk, skb, dev,
2820                                      &local_ip.sin6.sin6_addr,
2821                                      &dst->sin6.sin6_addr, tos, ttl,
2822                                      label, src_port, dst_port, !udp_sum);
2823 #endif
2824         }
2825 out_unlock:
2826         rcu_read_unlock();
2827         return;
2828
2829 drop:
2830         dev->stats.tx_dropped++;
2831         dev_kfree_skb(skb);
2832         return;
2833
2834 tx_error:
2835         rcu_read_unlock();
2836         if (err == -ELOOP)
2837                 dev->stats.collisions++;
2838         else if (err == -ENETUNREACH)
2839                 dev->stats.tx_carrier_errors++;
2840         dst_release(ndst);
2841         dev->stats.tx_errors++;
2842         kfree_skb(skb);
2843 }
2844
2845 static void vxlan_xmit_nh(struct sk_buff *skb, struct net_device *dev,
2846                           struct vxlan_fdb *f, __be32 vni, bool did_rsc)
2847 {
2848         struct vxlan_rdst nh_rdst;
2849         struct nexthop *nh;
2850         bool do_xmit;
2851         u32 hash;
2852
2853         memset(&nh_rdst, 0, sizeof(struct vxlan_rdst));
2854         hash = skb_get_hash(skb);
2855
2856         rcu_read_lock();
2857         nh = rcu_dereference(f->nh);
2858         if (!nh) {
2859                 rcu_read_unlock();
2860                 goto drop;
2861         }
2862         do_xmit = vxlan_fdb_nh_path_select(nh, hash, &nh_rdst);
2863         rcu_read_unlock();
2864
2865         if (likely(do_xmit))
2866                 vxlan_xmit_one(skb, dev, vni, &nh_rdst, did_rsc);
2867         else
2868                 goto drop;
2869
2870         return;
2871
2872 drop:
2873         dev->stats.tx_dropped++;
2874         dev_kfree_skb(skb);
2875 }
2876
2877 /* Transmit local packets over Vxlan
2878  *
2879  * Outer IP header inherits ECN and DF from inner header.
2880  * Outer UDP destination is the VXLAN assigned port.
2881  *           source port is based on hash of flow
2882  */
2883 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
2884 {
2885         struct vxlan_dev *vxlan = netdev_priv(dev);
2886         struct vxlan_rdst *rdst, *fdst = NULL;
2887         const struct ip_tunnel_info *info;
2888         bool did_rsc = false;
2889         struct vxlan_fdb *f;
2890         struct ethhdr *eth;
2891         __be32 vni = 0;
2892
2893         info = skb_tunnel_info(skb);
2894
2895         skb_reset_mac_header(skb);
2896
2897         if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) {
2898                 if (info && info->mode & IP_TUNNEL_INFO_BRIDGE &&
2899                     info->mode & IP_TUNNEL_INFO_TX) {
2900                         vni = tunnel_id_to_key32(info->key.tun_id);
2901                 } else {
2902                         if (info && info->mode & IP_TUNNEL_INFO_TX)
2903                                 vxlan_xmit_one(skb, dev, vni, NULL, false);
2904                         else
2905                                 kfree_skb(skb);
2906                         return NETDEV_TX_OK;
2907                 }
2908         }
2909
2910         if (vxlan->cfg.flags & VXLAN_F_PROXY) {
2911                 eth = eth_hdr(skb);
2912                 if (ntohs(eth->h_proto) == ETH_P_ARP)
2913                         return arp_reduce(dev, skb, vni);
2914 #if IS_ENABLED(CONFIG_IPV6)
2915                 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
2916                          pskb_may_pull(skb, sizeof(struct ipv6hdr) +
2917                                             sizeof(struct nd_msg)) &&
2918                          ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
2919                         struct nd_msg *m = (struct nd_msg *)(ipv6_hdr(skb) + 1);
2920
2921                         if (m->icmph.icmp6_code == 0 &&
2922                             m->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
2923                                 return neigh_reduce(dev, skb, vni);
2924                 }
2925 #endif
2926         }
2927
2928         eth = eth_hdr(skb);
2929         f = vxlan_find_mac(vxlan, eth->h_dest, vni);
2930         did_rsc = false;
2931
2932         if (f && (f->flags & NTF_ROUTER) && (vxlan->cfg.flags & VXLAN_F_RSC) &&
2933             (ntohs(eth->h_proto) == ETH_P_IP ||
2934              ntohs(eth->h_proto) == ETH_P_IPV6)) {
2935                 did_rsc = route_shortcircuit(dev, skb);
2936                 if (did_rsc)
2937                         f = vxlan_find_mac(vxlan, eth->h_dest, vni);
2938         }
2939
2940         if (f == NULL) {
2941                 f = vxlan_find_mac(vxlan, all_zeros_mac, vni);
2942                 if (f == NULL) {
2943                         if ((vxlan->cfg.flags & VXLAN_F_L2MISS) &&
2944                             !is_multicast_ether_addr(eth->h_dest))
2945                                 vxlan_fdb_miss(vxlan, eth->h_dest);
2946
2947                         dev->stats.tx_dropped++;
2948                         kfree_skb(skb);
2949                         return NETDEV_TX_OK;
2950                 }
2951         }
2952
2953         if (rcu_access_pointer(f->nh)) {
2954                 vxlan_xmit_nh(skb, dev, f,
2955                               (vni ? : vxlan->default_dst.remote_vni), did_rsc);
2956         } else {
2957                 list_for_each_entry_rcu(rdst, &f->remotes, list) {
2958                         struct sk_buff *skb1;
2959
2960                         if (!fdst) {
2961                                 fdst = rdst;
2962                                 continue;
2963                         }
2964                         skb1 = skb_clone(skb, GFP_ATOMIC);
2965                         if (skb1)
2966                                 vxlan_xmit_one(skb1, dev, vni, rdst, did_rsc);
2967                 }
2968                 if (fdst)
2969                         vxlan_xmit_one(skb, dev, vni, fdst, did_rsc);
2970                 else
2971                         kfree_skb(skb);
2972         }
2973
2974         return NETDEV_TX_OK;
2975 }
2976
2977 /* Walk the forwarding table and purge stale entries */
2978 static void vxlan_cleanup(struct timer_list *t)
2979 {
2980         struct vxlan_dev *vxlan = from_timer(vxlan, t, age_timer);
2981         unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2982         unsigned int h;
2983
2984         if (!netif_running(vxlan->dev))
2985                 return;
2986
2987         for (h = 0; h < FDB_HASH_SIZE; ++h) {
2988                 struct hlist_node *p, *n;
2989
2990                 spin_lock(&vxlan->hash_lock[h]);
2991                 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2992                         struct vxlan_fdb *f
2993                                 = container_of(p, struct vxlan_fdb, hlist);
2994                         unsigned long timeout;
2995
2996                         if (f->state & (NUD_PERMANENT | NUD_NOARP))
2997                                 continue;
2998
2999                         if (f->flags & NTF_EXT_LEARNED)
3000                                 continue;
3001
3002                         timeout = f->used + vxlan->cfg.age_interval * HZ;
3003                         if (time_before_eq(timeout, jiffies)) {
3004                                 netdev_dbg(vxlan->dev,
3005                                            "garbage collect %pM\n",
3006                                            f->eth_addr);
3007                                 f->state = NUD_STALE;
3008                                 vxlan_fdb_destroy(vxlan, f, true, true);
3009                         } else if (time_before(timeout, next_timer))
3010                                 next_timer = timeout;
3011                 }
3012                 spin_unlock(&vxlan->hash_lock[h]);
3013         }
3014
3015         mod_timer(&vxlan->age_timer, next_timer);
3016 }
3017
3018 static void vxlan_vs_del_dev(struct vxlan_dev *vxlan)
3019 {
3020         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
3021
3022         spin_lock(&vn->sock_lock);
3023         hlist_del_init_rcu(&vxlan->hlist4.hlist);
3024 #if IS_ENABLED(CONFIG_IPV6)
3025         hlist_del_init_rcu(&vxlan->hlist6.hlist);
3026 #endif
3027         spin_unlock(&vn->sock_lock);
3028 }
3029
3030 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan,
3031                              struct vxlan_dev_node *node)
3032 {
3033         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
3034         __be32 vni = vxlan->default_dst.remote_vni;
3035
3036         node->vxlan = vxlan;
3037         spin_lock(&vn->sock_lock);
3038         hlist_add_head_rcu(&node->hlist, vni_head(vs, vni));
3039         spin_unlock(&vn->sock_lock);
3040 }
3041
3042 /* Setup stats when device is created */
3043 static int vxlan_init(struct net_device *dev)
3044 {
3045         struct vxlan_dev *vxlan = netdev_priv(dev);
3046         int err;
3047
3048         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
3049         if (!dev->tstats)
3050                 return -ENOMEM;
3051
3052         err = gro_cells_init(&vxlan->gro_cells, dev);
3053         if (err) {
3054                 free_percpu(dev->tstats);
3055                 return err;
3056         }
3057
3058         return 0;
3059 }
3060
3061 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan, __be32 vni)
3062 {
3063         struct vxlan_fdb *f;
3064         u32 hash_index = fdb_head_index(vxlan, all_zeros_mac, vni);
3065
3066         spin_lock_bh(&vxlan->hash_lock[hash_index]);
3067         f = __vxlan_find_mac(vxlan, all_zeros_mac, vni);
3068         if (f)
3069                 vxlan_fdb_destroy(vxlan, f, true, true);
3070         spin_unlock_bh(&vxlan->hash_lock[hash_index]);
3071 }
3072
3073 static void vxlan_uninit(struct net_device *dev)
3074 {
3075         struct vxlan_dev *vxlan = netdev_priv(dev);
3076
3077         gro_cells_destroy(&vxlan->gro_cells);
3078
3079         vxlan_fdb_delete_default(vxlan, vxlan->cfg.vni);
3080
3081         free_percpu(dev->tstats);
3082 }
3083
3084 /* Start ageing timer and join group when device is brought up */
3085 static int vxlan_open(struct net_device *dev)
3086 {
3087         struct vxlan_dev *vxlan = netdev_priv(dev);
3088         int ret;
3089
3090         ret = vxlan_sock_add(vxlan);
3091         if (ret < 0)
3092                 return ret;
3093
3094         if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
3095                 ret = vxlan_igmp_join(vxlan);
3096                 if (ret == -EADDRINUSE)
3097                         ret = 0;
3098                 if (ret) {
3099                         vxlan_sock_release(vxlan);
3100                         return ret;
3101                 }
3102         }
3103
3104         if (vxlan->cfg.age_interval)
3105                 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
3106
3107         return ret;
3108 }
3109
3110 /* Purge the forwarding table */
3111 static void vxlan_flush(struct vxlan_dev *vxlan, bool do_all)
3112 {
3113         unsigned int h;
3114
3115         for (h = 0; h < FDB_HASH_SIZE; ++h) {
3116                 struct hlist_node *p, *n;
3117
3118                 spin_lock_bh(&vxlan->hash_lock[h]);
3119                 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
3120                         struct vxlan_fdb *f
3121                                 = container_of(p, struct vxlan_fdb, hlist);
3122                         if (!do_all && (f->state & (NUD_PERMANENT | NUD_NOARP)))
3123                                 continue;
3124                         /* the all_zeros_mac entry is deleted at vxlan_uninit */
3125                         if (is_zero_ether_addr(f->eth_addr) &&
3126                             f->vni == vxlan->cfg.vni)
3127                                 continue;
3128                         vxlan_fdb_destroy(vxlan, f, true, true);
3129                 }
3130                 spin_unlock_bh(&vxlan->hash_lock[h]);
3131         }
3132 }
3133
3134 /* Cleanup timer and forwarding table on shutdown */
3135 static int vxlan_stop(struct net_device *dev)
3136 {
3137         struct vxlan_dev *vxlan = netdev_priv(dev);
3138         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
3139         int ret = 0;
3140
3141         if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
3142             !vxlan_group_used(vn, vxlan))
3143                 ret = vxlan_igmp_leave(vxlan);
3144
3145         del_timer_sync(&vxlan->age_timer);
3146
3147         vxlan_flush(vxlan, false);
3148         vxlan_sock_release(vxlan);
3149
3150         return ret;
3151 }
3152
3153 /* Stub, nothing needs to be done. */
3154 static void vxlan_set_multicast_list(struct net_device *dev)
3155 {
3156 }
3157
3158 static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
3159 {
3160         struct vxlan_dev *vxlan = netdev_priv(dev);
3161         struct vxlan_rdst *dst = &vxlan->default_dst;
3162         struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
3163                                                          dst->remote_ifindex);
3164
3165         /* This check is different than dev->max_mtu, because it looks at
3166          * the lowerdev->mtu, rather than the static dev->max_mtu
3167          */
3168         if (lowerdev) {
3169                 int max_mtu = lowerdev->mtu - vxlan_headroom(vxlan->cfg.flags);
3170                 if (new_mtu > max_mtu)
3171                         return -EINVAL;
3172         }
3173
3174         dev->mtu = new_mtu;
3175         return 0;
3176 }
3177
3178 static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
3179 {
3180         struct vxlan_dev *vxlan = netdev_priv(dev);
3181         struct ip_tunnel_info *info = skb_tunnel_info(skb);
3182         __be16 sport, dport;
3183
3184         sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
3185                                   vxlan->cfg.port_max, true);
3186         dport = info->key.tp_dst ? : vxlan->cfg.dst_port;
3187
3188         if (ip_tunnel_info_af(info) == AF_INET) {
3189                 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
3190                 struct rtable *rt;
3191
3192                 rt = vxlan_get_route(vxlan, dev, sock4, skb, 0, info->key.tos,
3193                                      info->key.u.ipv4.dst,
3194                                      &info->key.u.ipv4.src, dport, sport,
3195                                      &info->dst_cache, info);
3196                 if (IS_ERR(rt))
3197                         return PTR_ERR(rt);
3198                 ip_rt_put(rt);
3199         } else {
3200 #if IS_ENABLED(CONFIG_IPV6)
3201                 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
3202                 struct dst_entry *ndst;
3203
3204                 ndst = vxlan6_get_route(vxlan, dev, sock6, skb, 0, info->key.tos,
3205                                         info->key.label, &info->key.u.ipv6.dst,
3206                                         &info->key.u.ipv6.src, dport, sport,
3207                                         &info->dst_cache, info);
3208                 if (IS_ERR(ndst))
3209                         return PTR_ERR(ndst);
3210                 dst_release(ndst);
3211 #else /* !CONFIG_IPV6 */
3212                 return -EPFNOSUPPORT;
3213 #endif
3214         }
3215         info->key.tp_src = sport;
3216         info->key.tp_dst = dport;
3217         return 0;
3218 }
3219
3220 static const struct net_device_ops vxlan_netdev_ether_ops = {
3221         .ndo_init               = vxlan_init,
3222         .ndo_uninit             = vxlan_uninit,
3223         .ndo_open               = vxlan_open,
3224         .ndo_stop               = vxlan_stop,
3225         .ndo_start_xmit         = vxlan_xmit,
3226         .ndo_get_stats64        = ip_tunnel_get_stats64,
3227         .ndo_set_rx_mode        = vxlan_set_multicast_list,
3228         .ndo_change_mtu         = vxlan_change_mtu,
3229         .ndo_validate_addr      = eth_validate_addr,
3230         .ndo_set_mac_address    = eth_mac_addr,
3231         .ndo_fdb_add            = vxlan_fdb_add,
3232         .ndo_fdb_del            = vxlan_fdb_delete,
3233         .ndo_fdb_dump           = vxlan_fdb_dump,
3234         .ndo_fdb_get            = vxlan_fdb_get,
3235         .ndo_fill_metadata_dst  = vxlan_fill_metadata_dst,
3236         .ndo_change_proto_down  = dev_change_proto_down_generic,
3237 };
3238
3239 static const struct net_device_ops vxlan_netdev_raw_ops = {
3240         .ndo_init               = vxlan_init,
3241         .ndo_uninit             = vxlan_uninit,
3242         .ndo_open               = vxlan_open,
3243         .ndo_stop               = vxlan_stop,
3244         .ndo_start_xmit         = vxlan_xmit,
3245         .ndo_get_stats64        = ip_tunnel_get_stats64,
3246         .ndo_change_mtu         = vxlan_change_mtu,
3247         .ndo_fill_metadata_dst  = vxlan_fill_metadata_dst,
3248 };
3249
3250 /* Info for udev, that this is a virtual tunnel endpoint */
3251 static struct device_type vxlan_type = {
3252         .name = "vxlan",
3253 };
3254
3255 /* Calls the ndo_udp_tunnel_add of the caller in order to
3256  * supply the listening VXLAN udp ports. Callers are expected
3257  * to implement the ndo_udp_tunnel_add.
3258  */
3259 static void vxlan_offload_rx_ports(struct net_device *dev, bool push)
3260 {
3261         struct vxlan_sock *vs;
3262         struct net *net = dev_net(dev);
3263         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3264         unsigned int i;
3265
3266         spin_lock(&vn->sock_lock);
3267         for (i = 0; i < PORT_HASH_SIZE; ++i) {
3268                 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
3269                         unsigned short type;
3270
3271                         if (vs->flags & VXLAN_F_GPE)
3272                                 type = UDP_TUNNEL_TYPE_VXLAN_GPE;
3273                         else
3274                                 type = UDP_TUNNEL_TYPE_VXLAN;
3275
3276                         if (push)
3277                                 udp_tunnel_push_rx_port(dev, vs->sock, type);
3278                         else
3279                                 udp_tunnel_drop_rx_port(dev, vs->sock, type);
3280                 }
3281         }
3282         spin_unlock(&vn->sock_lock);
3283 }
3284
3285 /* Initialize the device structure. */
3286 static void vxlan_setup(struct net_device *dev)
3287 {
3288         struct vxlan_dev *vxlan = netdev_priv(dev);
3289         unsigned int h;
3290
3291         eth_hw_addr_random(dev);
3292         ether_setup(dev);
3293
3294         dev->needs_free_netdev = true;
3295         SET_NETDEV_DEVTYPE(dev, &vxlan_type);
3296
3297         dev->features   |= NETIF_F_LLTX;
3298         dev->features   |= NETIF_F_SG | NETIF_F_HW_CSUM;
3299         dev->features   |= NETIF_F_RXCSUM;
3300         dev->features   |= NETIF_F_GSO_SOFTWARE;
3301
3302         dev->vlan_features = dev->features;
3303         dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
3304         dev->hw_features |= NETIF_F_GSO_SOFTWARE;
3305         netif_keep_dst(dev);
3306         dev->priv_flags |= IFF_NO_QUEUE;
3307
3308         /* MTU range: 68 - 65535 */
3309         dev->min_mtu = ETH_MIN_MTU;
3310         dev->max_mtu = ETH_MAX_MTU;
3311
3312         INIT_LIST_HEAD(&vxlan->next);
3313
3314         timer_setup(&vxlan->age_timer, vxlan_cleanup, TIMER_DEFERRABLE);
3315
3316         vxlan->dev = dev;
3317
3318         for (h = 0; h < FDB_HASH_SIZE; ++h) {
3319                 spin_lock_init(&vxlan->hash_lock[h]);
3320                 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
3321         }
3322 }
3323
3324 static void vxlan_ether_setup(struct net_device *dev)
3325 {
3326         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
3327         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
3328         dev->netdev_ops = &vxlan_netdev_ether_ops;
3329 }
3330
3331 static void vxlan_raw_setup(struct net_device *dev)
3332 {
3333         dev->header_ops = NULL;
3334         dev->type = ARPHRD_NONE;
3335         dev->hard_header_len = 0;
3336         dev->addr_len = 0;
3337         dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
3338         dev->netdev_ops = &vxlan_netdev_raw_ops;
3339 }
3340
3341 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
3342         [IFLA_VXLAN_ID]         = { .type = NLA_U32 },
3343         [IFLA_VXLAN_GROUP]      = { .len = sizeof_field(struct iphdr, daddr) },
3344         [IFLA_VXLAN_GROUP6]     = { .len = sizeof(struct in6_addr) },
3345         [IFLA_VXLAN_LINK]       = { .type = NLA_U32 },
3346         [IFLA_VXLAN_LOCAL]      = { .len = sizeof_field(struct iphdr, saddr) },
3347         [IFLA_VXLAN_LOCAL6]     = { .len = sizeof(struct in6_addr) },
3348         [IFLA_VXLAN_TOS]        = { .type = NLA_U8 },
3349         [IFLA_VXLAN_TTL]        = { .type = NLA_U8 },
3350         [IFLA_VXLAN_LABEL]      = { .type = NLA_U32 },
3351         [IFLA_VXLAN_LEARNING]   = { .type = NLA_U8 },
3352         [IFLA_VXLAN_AGEING]     = { .type = NLA_U32 },
3353         [IFLA_VXLAN_LIMIT]      = { .type = NLA_U32 },
3354         [IFLA_VXLAN_PORT_RANGE] = { .len  = sizeof(struct ifla_vxlan_port_range) },
3355         [IFLA_VXLAN_PROXY]      = { .type = NLA_U8 },
3356         [IFLA_VXLAN_RSC]        = { .type = NLA_U8 },
3357         [IFLA_VXLAN_L2MISS]     = { .type = NLA_U8 },
3358         [IFLA_VXLAN_L3MISS]     = { .type = NLA_U8 },
3359         [IFLA_VXLAN_COLLECT_METADATA]   = { .type = NLA_U8 },
3360         [IFLA_VXLAN_PORT]       = { .type = NLA_U16 },
3361         [IFLA_VXLAN_UDP_CSUM]   = { .type = NLA_U8 },
3362         [IFLA_VXLAN_UDP_ZERO_CSUM6_TX]  = { .type = NLA_U8 },
3363         [IFLA_VXLAN_UDP_ZERO_CSUM6_RX]  = { .type = NLA_U8 },
3364         [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 },
3365         [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
3366         [IFLA_VXLAN_GBP]        = { .type = NLA_FLAG, },
3367         [IFLA_VXLAN_GPE]        = { .type = NLA_FLAG, },
3368         [IFLA_VXLAN_REMCSUM_NOPARTIAL]  = { .type = NLA_FLAG },
3369         [IFLA_VXLAN_TTL_INHERIT]        = { .type = NLA_FLAG },
3370         [IFLA_VXLAN_DF]         = { .type = NLA_U8 },
3371 };
3372
3373 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[],
3374                           struct netlink_ext_ack *extack)
3375 {
3376         if (tb[IFLA_ADDRESS]) {
3377                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
3378                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
3379                                             "Provided link layer address is not Ethernet");
3380                         return -EINVAL;
3381                 }
3382
3383                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
3384                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
3385                                             "Provided Ethernet address is not unicast");
3386                         return -EADDRNOTAVAIL;
3387                 }
3388         }
3389
3390         if (tb[IFLA_MTU]) {
3391                 u32 mtu = nla_get_u32(tb[IFLA_MTU]);
3392
3393                 if (mtu < ETH_MIN_MTU || mtu > ETH_MAX_MTU) {
3394                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_MTU],
3395                                             "MTU must be between 68 and 65535");
3396                         return -EINVAL;
3397                 }
3398         }
3399
3400         if (!data) {
3401                 NL_SET_ERR_MSG(extack,
3402                                "Required attributes not provided to perform the operation");
3403                 return -EINVAL;
3404         }
3405
3406         if (data[IFLA_VXLAN_ID]) {
3407                 u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
3408
3409                 if (id >= VXLAN_N_VID) {
3410                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_ID],
3411                                             "VXLAN ID must be lower than 16777216");
3412                         return -ERANGE;
3413                 }
3414         }
3415
3416         if (data[IFLA_VXLAN_PORT_RANGE]) {
3417                 const struct ifla_vxlan_port_range *p
3418                         = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
3419
3420                 if (ntohs(p->high) < ntohs(p->low)) {
3421                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_PORT_RANGE],
3422                                             "Invalid source port range");
3423                         return -EINVAL;
3424                 }
3425         }
3426
3427         if (data[IFLA_VXLAN_DF]) {
3428                 enum ifla_vxlan_df df = nla_get_u8(data[IFLA_VXLAN_DF]);
3429
3430                 if (df < 0 || df > VXLAN_DF_MAX) {
3431                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_DF],
3432                                             "Invalid DF attribute");
3433                         return -EINVAL;
3434                 }
3435         }
3436
3437         return 0;
3438 }
3439
3440 static void vxlan_get_drvinfo(struct net_device *netdev,
3441                               struct ethtool_drvinfo *drvinfo)
3442 {
3443         strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
3444         strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
3445 }
3446
3447 static int vxlan_get_link_ksettings(struct net_device *dev,
3448                                     struct ethtool_link_ksettings *cmd)
3449 {
3450         struct vxlan_dev *vxlan = netdev_priv(dev);
3451         struct vxlan_rdst *dst = &vxlan->default_dst;
3452         struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
3453                                                          dst->remote_ifindex);
3454
3455         if (!lowerdev) {
3456                 cmd->base.duplex = DUPLEX_UNKNOWN;
3457                 cmd->base.port = PORT_OTHER;
3458                 cmd->base.speed = SPEED_UNKNOWN;
3459
3460                 return 0;
3461         }
3462
3463         return __ethtool_get_link_ksettings(lowerdev, cmd);
3464 }
3465
3466 static const struct ethtool_ops vxlan_ethtool_ops = {
3467         .get_drvinfo            = vxlan_get_drvinfo,
3468         .get_link               = ethtool_op_get_link,
3469         .get_link_ksettings     = vxlan_get_link_ksettings,
3470 };
3471
3472 static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
3473                                         __be16 port, u32 flags, int ifindex)
3474 {
3475         struct socket *sock;
3476         struct udp_port_cfg udp_conf;
3477         int err;
3478
3479         memset(&udp_conf, 0, sizeof(udp_conf));
3480
3481         if (ipv6) {
3482                 udp_conf.family = AF_INET6;
3483                 udp_conf.use_udp6_rx_checksums =
3484                     !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
3485                 udp_conf.ipv6_v6only = 1;
3486         } else {
3487                 udp_conf.family = AF_INET;
3488         }
3489
3490         udp_conf.local_udp_port = port;
3491         udp_conf.bind_ifindex = ifindex;
3492
3493         /* Open UDP socket */
3494         err = udp_sock_create(net, &udp_conf, &sock);
3495         if (err < 0)
3496                 return ERR_PTR(err);
3497
3498         return sock;
3499 }
3500
3501 /* Create new listen socket if needed */
3502 static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6,
3503                                               __be16 port, u32 flags,
3504                                               int ifindex)
3505 {
3506         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3507         struct vxlan_sock *vs;
3508         struct socket *sock;
3509         unsigned int h;
3510         struct udp_tunnel_sock_cfg tunnel_cfg;
3511
3512         vs = kzalloc(sizeof(*vs), GFP_KERNEL);
3513         if (!vs)
3514                 return ERR_PTR(-ENOMEM);
3515
3516         for (h = 0; h < VNI_HASH_SIZE; ++h)
3517                 INIT_HLIST_HEAD(&vs->vni_list[h]);
3518
3519         sock = vxlan_create_sock(net, ipv6, port, flags, ifindex);
3520         if (IS_ERR(sock)) {
3521                 kfree(vs);
3522                 return ERR_CAST(sock);
3523         }
3524
3525         vs->sock = sock;
3526         refcount_set(&vs->refcnt, 1);
3527         vs->flags = (flags & VXLAN_F_RCV_FLAGS);
3528
3529         spin_lock(&vn->sock_lock);
3530         hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
3531         udp_tunnel_notify_add_rx_port(sock,
3532                                       (vs->flags & VXLAN_F_GPE) ?
3533                                       UDP_TUNNEL_TYPE_VXLAN_GPE :
3534                                       UDP_TUNNEL_TYPE_VXLAN);
3535         spin_unlock(&vn->sock_lock);
3536
3537         /* Mark socket as an encapsulation socket. */
3538         memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
3539         tunnel_cfg.sk_user_data = vs;
3540         tunnel_cfg.encap_type = 1;
3541         tunnel_cfg.encap_rcv = vxlan_rcv;
3542         tunnel_cfg.encap_err_lookup = vxlan_err_lookup;
3543         tunnel_cfg.encap_destroy = NULL;
3544         tunnel_cfg.gro_receive = vxlan_gro_receive;
3545         tunnel_cfg.gro_complete = vxlan_gro_complete;
3546
3547         setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
3548
3549         return vs;
3550 }
3551
3552 static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6)
3553 {
3554         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
3555         struct vxlan_sock *vs = NULL;
3556         struct vxlan_dev_node *node;
3557         int l3mdev_index = 0;
3558
3559         if (vxlan->cfg.remote_ifindex)
3560                 l3mdev_index = l3mdev_master_upper_ifindex_by_index(
3561                         vxlan->net, vxlan->cfg.remote_ifindex);
3562
3563         if (!vxlan->cfg.no_share) {
3564                 spin_lock(&vn->sock_lock);
3565                 vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
3566                                      vxlan->cfg.dst_port, vxlan->cfg.flags,
3567                                      l3mdev_index);
3568                 if (vs && !refcount_inc_not_zero(&vs->refcnt)) {
3569                         spin_unlock(&vn->sock_lock);
3570                         return -EBUSY;
3571                 }
3572                 spin_unlock(&vn->sock_lock);
3573         }
3574         if (!vs)
3575                 vs = vxlan_socket_create(vxlan->net, ipv6,
3576                                          vxlan->cfg.dst_port, vxlan->cfg.flags,
3577                                          l3mdev_index);
3578         if (IS_ERR(vs))
3579                 return PTR_ERR(vs);
3580 #if IS_ENABLED(CONFIG_IPV6)
3581         if (ipv6) {
3582                 rcu_assign_pointer(vxlan->vn6_sock, vs);
3583                 node = &vxlan->hlist6;
3584         } else
3585 #endif
3586         {
3587                 rcu_assign_pointer(vxlan->vn4_sock, vs);
3588                 node = &vxlan->hlist4;
3589         }
3590         vxlan_vs_add_dev(vs, vxlan, node);
3591         return 0;
3592 }
3593
3594 static int vxlan_sock_add(struct vxlan_dev *vxlan)
3595 {
3596         bool metadata = vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA;
3597         bool ipv6 = vxlan->cfg.flags & VXLAN_F_IPV6 || metadata;
3598         bool ipv4 = !ipv6 || metadata;
3599         int ret = 0;
3600
3601         RCU_INIT_POINTER(vxlan->vn4_sock, NULL);
3602 #if IS_ENABLED(CONFIG_IPV6)
3603         RCU_INIT_POINTER(vxlan->vn6_sock, NULL);
3604         if (ipv6) {
3605                 ret = __vxlan_sock_add(vxlan, true);
3606                 if (ret < 0 && ret != -EAFNOSUPPORT)
3607                         ipv4 = false;
3608         }
3609 #endif
3610         if (ipv4)
3611                 ret = __vxlan_sock_add(vxlan, false);
3612         if (ret < 0)
3613                 vxlan_sock_release(vxlan);
3614         return ret;
3615 }
3616
3617 static int vxlan_config_validate(struct net *src_net, struct vxlan_config *conf,
3618                                  struct net_device **lower,
3619                                  struct vxlan_dev *old,
3620                                  struct netlink_ext_ack *extack)
3621 {
3622         struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
3623         struct vxlan_dev *tmp;
3624         bool use_ipv6 = false;
3625
3626         if (conf->flags & VXLAN_F_GPE) {
3627                 /* For now, allow GPE only together with
3628                  * COLLECT_METADATA. This can be relaxed later; in such
3629                  * case, the other side of the PtP link will have to be
3630                  * provided.
3631                  */
3632                 if ((conf->flags & ~VXLAN_F_ALLOWED_GPE) ||
3633                     !(conf->flags & VXLAN_F_COLLECT_METADATA)) {
3634                         NL_SET_ERR_MSG(extack,
3635                                        "VXLAN GPE does not support this combination of attributes");
3636                         return -EINVAL;
3637                 }
3638         }
3639
3640         if (!conf->remote_ip.sa.sa_family && !conf->saddr.sa.sa_family) {
3641                 /* Unless IPv6 is explicitly requested, assume IPv4 */
3642                 conf->remote_ip.sa.sa_family = AF_INET;
3643                 conf->saddr.sa.sa_family = AF_INET;
3644         } else if (!conf->remote_ip.sa.sa_family) {
3645                 conf->remote_ip.sa.sa_family = conf->saddr.sa.sa_family;
3646         } else if (!conf->saddr.sa.sa_family) {
3647                 conf->saddr.sa.sa_family = conf->remote_ip.sa.sa_family;
3648         }
3649
3650         if (conf->saddr.sa.sa_family != conf->remote_ip.sa.sa_family) {
3651                 NL_SET_ERR_MSG(extack,
3652                                "Local and remote address must be from the same family");
3653                 return -EINVAL;
3654         }
3655
3656         if (vxlan_addr_multicast(&conf->saddr)) {
3657                 NL_SET_ERR_MSG(extack, "Local address cannot be multicast");
3658                 return -EINVAL;
3659         }
3660
3661         if (conf->saddr.sa.sa_family == AF_INET6) {
3662                 if (!IS_ENABLED(CONFIG_IPV6)) {
3663                         NL_SET_ERR_MSG(extack,
3664                                        "IPv6 support not enabled in the kernel");
3665                         return -EPFNOSUPPORT;
3666                 }
3667                 use_ipv6 = true;
3668                 conf->flags |= VXLAN_F_IPV6;
3669
3670                 if (!(conf->flags & VXLAN_F_COLLECT_METADATA)) {
3671                         int local_type =
3672                                 ipv6_addr_type(&conf->saddr.sin6.sin6_addr);
3673                         int remote_type =
3674                                 ipv6_addr_type(&conf->remote_ip.sin6.sin6_addr);
3675
3676                         if (local_type & IPV6_ADDR_LINKLOCAL) {
3677                                 if (!(remote_type & IPV6_ADDR_LINKLOCAL) &&
3678                                     (remote_type != IPV6_ADDR_ANY)) {
3679                                         NL_SET_ERR_MSG(extack,
3680                                                        "Invalid combination of local and remote address scopes");
3681                                         return -EINVAL;
3682                                 }
3683
3684                                 conf->flags |= VXLAN_F_IPV6_LINKLOCAL;
3685                         } else {
3686                                 if (remote_type ==
3687                                     (IPV6_ADDR_UNICAST | IPV6_ADDR_LINKLOCAL)) {
3688                                         NL_SET_ERR_MSG(extack,
3689                                                        "Invalid combination of local and remote address scopes");
3690                                         return -EINVAL;
3691                                 }
3692
3693                                 conf->flags &= ~VXLAN_F_IPV6_LINKLOCAL;
3694                         }
3695                 }
3696         }
3697
3698         if (conf->label && !use_ipv6) {
3699                 NL_SET_ERR_MSG(extack,
3700                                "Label attribute only applies to IPv6 VXLAN devices");
3701                 return -EINVAL;
3702         }
3703
3704         if (conf->remote_ifindex) {
3705                 struct net_device *lowerdev;
3706
3707                 lowerdev = __dev_get_by_index(src_net, conf->remote_ifindex);
3708                 if (!lowerdev) {
3709                         NL_SET_ERR_MSG(extack,
3710                                        "Invalid local interface, device not found");
3711                         return -ENODEV;
3712                 }
3713
3714 #if IS_ENABLED(CONFIG_IPV6)
3715                 if (use_ipv6) {
3716                         struct inet6_dev *idev = __in6_dev_get(lowerdev);
3717                         if (idev && idev->cnf.disable_ipv6) {
3718                                 NL_SET_ERR_MSG(extack,
3719                                                "IPv6 support disabled by administrator");
3720                                 return -EPERM;
3721                         }
3722                 }
3723 #endif
3724
3725                 *lower = lowerdev;
3726         } else {
3727                 if (vxlan_addr_multicast(&conf->remote_ip)) {
3728                         NL_SET_ERR_MSG(extack,
3729                                        "Local interface required for multicast remote destination");
3730
3731                         return -EINVAL;
3732                 }
3733
3734 #if IS_ENABLED(CONFIG_IPV6)
3735                 if (conf->flags & VXLAN_F_IPV6_LINKLOCAL) {
3736                         NL_SET_ERR_MSG(extack,
3737                                        "Local interface required for link-local local/remote addresses");
3738                         return -EINVAL;
3739                 }
3740 #endif
3741
3742                 *lower = NULL;
3743         }
3744
3745         if (!conf->dst_port) {
3746                 if (conf->flags & VXLAN_F_GPE)
3747                         conf->dst_port = htons(4790); /* IANA VXLAN-GPE port */
3748                 else
3749                         conf->dst_port = htons(vxlan_port);
3750         }
3751
3752         if (!conf->age_interval)
3753                 conf->age_interval = FDB_AGE_DEFAULT;
3754
3755         list_for_each_entry(tmp, &vn->vxlan_list, next) {
3756                 if (tmp == old)
3757                         continue;
3758
3759                 if (tmp->cfg.vni != conf->vni)
3760                         continue;
3761                 if (tmp->cfg.dst_port != conf->dst_port)
3762                         continue;
3763                 if ((tmp->cfg.flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)) !=
3764                     (conf->flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)))
3765                         continue;
3766
3767                 if ((conf->flags & VXLAN_F_IPV6_LINKLOCAL) &&
3768                     tmp->cfg.remote_ifindex != conf->remote_ifindex)
3769                         continue;
3770
3771                 NL_SET_ERR_MSG(extack,
3772                                "A VXLAN device with the specified VNI already exists");
3773                 return -EEXIST;
3774         }
3775
3776         return 0;
3777 }
3778
3779 static void vxlan_config_apply(struct net_device *dev,
3780                                struct vxlan_config *conf,
3781                                struct net_device *lowerdev,
3782                                struct net *src_net,
3783                                bool changelink)
3784 {
3785         struct vxlan_dev *vxlan = netdev_priv(dev);
3786         struct vxlan_rdst *dst = &vxlan->default_dst;
3787         unsigned short needed_headroom = ETH_HLEN;
3788         int max_mtu = ETH_MAX_MTU;
3789         u32 flags = conf->flags;
3790
3791         if (!changelink) {
3792                 if (flags & VXLAN_F_GPE)
3793                         vxlan_raw_setup(dev);
3794                 else
3795                         vxlan_ether_setup(dev);
3796
3797                 if (conf->mtu)
3798                         dev->mtu = conf->mtu;
3799
3800                 vxlan->net = src_net;
3801         }
3802
3803         dst->remote_vni = conf->vni;
3804
3805         memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip));
3806
3807         if (lowerdev) {
3808                 dst->remote_ifindex = conf->remote_ifindex;
3809
3810                 dev->gso_max_size = lowerdev->gso_max_size;
3811                 dev->gso_max_segs = lowerdev->gso_max_segs;
3812
3813                 needed_headroom = lowerdev->hard_header_len;
3814                 needed_headroom += lowerdev->needed_headroom;
3815
3816                 dev->needed_tailroom = lowerdev->needed_tailroom;
3817
3818                 max_mtu = lowerdev->mtu - vxlan_headroom(flags);
3819                 if (max_mtu < ETH_MIN_MTU)
3820                         max_mtu = ETH_MIN_MTU;
3821
3822                 if (!changelink && !conf->mtu)
3823                         dev->mtu = max_mtu;
3824         }
3825
3826         if (dev->mtu > max_mtu)
3827                 dev->mtu = max_mtu;
3828
3829         if (flags & VXLAN_F_COLLECT_METADATA)
3830                 flags |= VXLAN_F_IPV6;
3831         needed_headroom += vxlan_headroom(flags);
3832         dev->needed_headroom = needed_headroom;
3833
3834         memcpy(&vxlan->cfg, conf, sizeof(*conf));
3835 }
3836
3837 static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
3838                                struct vxlan_config *conf, bool changelink,
3839                                struct netlink_ext_ack *extack)
3840 {
3841         struct vxlan_dev *vxlan = netdev_priv(dev);
3842         struct net_device *lowerdev;
3843         int ret;
3844
3845         ret = vxlan_config_validate(src_net, conf, &lowerdev, vxlan, extack);
3846         if (ret)
3847                 return ret;
3848
3849         vxlan_config_apply(dev, conf, lowerdev, src_net, changelink);
3850
3851         return 0;
3852 }
3853
3854 static int __vxlan_dev_create(struct net *net, struct net_device *dev,
3855                               struct vxlan_config *conf,
3856                               struct netlink_ext_ack *extack)
3857 {
3858         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3859         struct vxlan_dev *vxlan = netdev_priv(dev);
3860         struct net_device *remote_dev = NULL;
3861         struct vxlan_fdb *f = NULL;
3862         bool unregister = false;
3863         struct vxlan_rdst *dst;
3864         int err;
3865
3866         dst = &vxlan->default_dst;
3867         err = vxlan_dev_configure(net, dev, conf, false, extack);
3868         if (err)
3869                 return err;
3870
3871         dev->ethtool_ops = &vxlan_ethtool_ops;
3872
3873         /* create an fdb entry for a valid default destination */
3874         if (!vxlan_addr_any(&dst->remote_ip)) {
3875                 err = vxlan_fdb_create(vxlan, all_zeros_mac,
3876                                        &dst->remote_ip,
3877                                        NUD_REACHABLE | NUD_PERMANENT,
3878                                        vxlan->cfg.dst_port,
3879                                        dst->remote_vni,
3880                                        dst->remote_vni,
3881                                        dst->remote_ifindex,
3882                                        NTF_SELF, 0, &f, extack);
3883                 if (err)
3884                         return err;
3885         }
3886
3887         err = register_netdevice(dev);
3888         if (err)
3889                 goto errout;
3890         unregister = true;
3891
3892         if (dst->remote_ifindex) {
3893                 remote_dev = __dev_get_by_index(net, dst->remote_ifindex);
3894                 if (!remote_dev) {
3895                         err = -ENODEV;
3896                         goto errout;
3897                 }
3898
3899                 err = netdev_upper_dev_link(remote_dev, dev, extack);
3900                 if (err)
3901                         goto errout;
3902         }
3903
3904         err = rtnl_configure_link(dev, NULL);
3905         if (err < 0)
3906                 goto unlink;
3907
3908         if (f) {
3909                 vxlan_fdb_insert(vxlan, all_zeros_mac, dst->remote_vni, f);
3910
3911                 /* notify default fdb entry */
3912                 err = vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f),
3913                                        RTM_NEWNEIGH, true, extack);
3914                 if (err) {
3915                         vxlan_fdb_destroy(vxlan, f, false, false);
3916                         if (remote_dev)
3917                                 netdev_upper_dev_unlink(remote_dev, dev);
3918                         goto unregister;
3919                 }
3920         }
3921
3922         list_add(&vxlan->next, &vn->vxlan_list);
3923         if (remote_dev)
3924                 dst->remote_dev = remote_dev;
3925         return 0;
3926 unlink:
3927         if (remote_dev)
3928                 netdev_upper_dev_unlink(remote_dev, dev);
3929 errout:
3930         /* unregister_netdevice() destroys the default FDB entry with deletion
3931          * notification. But the addition notification was not sent yet, so
3932          * destroy the entry by hand here.
3933          */
3934         if (f)
3935                 __vxlan_fdb_free(f);
3936 unregister:
3937         if (unregister)
3938                 unregister_netdevice(dev);
3939         return err;
3940 }
3941
3942 /* Set/clear flags based on attribute */
3943 static int vxlan_nl2flag(struct vxlan_config *conf, struct nlattr *tb[],
3944                           int attrtype, unsigned long mask, bool changelink,
3945                           bool changelink_supported,
3946                           struct netlink_ext_ack *extack)
3947 {
3948         unsigned long flags;
3949
3950         if (!tb[attrtype])
3951                 return 0;
3952
3953         if (changelink && !changelink_supported) {
3954                 vxlan_flag_attr_error(attrtype, extack);
3955                 return -EOPNOTSUPP;
3956         }
3957
3958         if (vxlan_policy[attrtype].type == NLA_FLAG)
3959                 flags = conf->flags | mask;
3960         else if (nla_get_u8(tb[attrtype]))
3961                 flags = conf->flags | mask;
3962         else
3963                 flags = conf->flags & ~mask;
3964
3965         conf->flags = flags;
3966
3967         return 0;
3968 }
3969
3970 static int vxlan_nl2conf(struct nlattr *tb[], struct nlattr *data[],
3971                          struct net_device *dev, struct vxlan_config *conf,
3972                          bool changelink, struct netlink_ext_ack *extack)
3973 {
3974         struct vxlan_dev *vxlan = netdev_priv(dev);
3975         int err = 0;
3976
3977         memset(conf, 0, sizeof(*conf));
3978
3979         /* if changelink operation, start with old existing cfg */
3980         if (changelink)
3981                 memcpy(conf, &vxlan->cfg, sizeof(*conf));
3982
3983         if (data[IFLA_VXLAN_ID]) {
3984                 __be32 vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
3985
3986                 if (changelink && (vni != conf->vni)) {
3987                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_ID], "Cannot change VNI");
3988                         return -EOPNOTSUPP;
3989                 }
3990                 conf->vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
3991         }
3992
3993         if (data[IFLA_VXLAN_GROUP]) {
3994                 if (changelink && (conf->remote_ip.sa.sa_family != AF_INET)) {
3995                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP], "New group address family does not match old group");
3996                         return -EOPNOTSUPP;
3997                 }
3998
3999                 conf->remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
4000                 conf->remote_ip.sa.sa_family = AF_INET;
4001         } else if (data[IFLA_VXLAN_GROUP6]) {
4002                 if (!IS_ENABLED(CONFIG_IPV6)) {
4003                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP6], "IPv6 support not enabled in the kernel");
4004                         return -EPFNOSUPPORT;
4005                 }
4006
4007                 if (changelink && (conf->remote_ip.sa.sa_family != AF_INET6)) {
4008                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP6], "New group address family does not match old group");
4009                         return -EOPNOTSUPP;
4010                 }
4011
4012                 conf->remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]);
4013                 conf->remote_ip.sa.sa_family = AF_INET6;
4014         }
4015
4016         if (data[IFLA_VXLAN_LOCAL]) {
4017                 if (changelink && (conf->saddr.sa.sa_family != AF_INET)) {
4018                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL], "New local address family does not match old");
4019                         return -EOPNOTSUPP;
4020                 }
4021
4022                 conf->saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]);
4023                 conf->saddr.sa.sa_family = AF_INET;
4024         } else if (data[IFLA_VXLAN_LOCAL6]) {
4025                 if (!IS_ENABLED(CONFIG_IPV6)) {
4026                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL6], "IPv6 support not enabled in the kernel");
4027                         return -EPFNOSUPPORT;
4028                 }
4029
4030                 if (changelink && (conf->saddr.sa.sa_family != AF_INET6)) {
4031                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL6], "New local address family does not match old");
4032                         return -EOPNOTSUPP;
4033                 }
4034
4035                 /* TODO: respect scope id */
4036                 conf->saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
4037                 conf->saddr.sa.sa_family = AF_INET6;
4038         }
4039
4040         if (data[IFLA_VXLAN_LINK])
4041                 conf->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]);
4042
4043         if (data[IFLA_VXLAN_TOS])
4044                 conf->tos  = nla_get_u8(data[IFLA_VXLAN_TOS]);
4045
4046         if (data[IFLA_VXLAN_TTL])
4047                 conf->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
4048
4049         if (data[IFLA_VXLAN_TTL_INHERIT]) {
4050                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_TTL_INHERIT,
4051                                     VXLAN_F_TTL_INHERIT, changelink, false,
4052                                     extack);
4053                 if (err)
4054                         return err;
4055
4056         }
4057
4058         if (data[IFLA_VXLAN_LABEL])
4059                 conf->label = nla_get_be32(data[IFLA_VXLAN_LABEL]) &
4060                              IPV6_FLOWLABEL_MASK;
4061
4062         if (data[IFLA_VXLAN_LEARNING]) {
4063                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_LEARNING,
4064                                     VXLAN_F_LEARN, changelink, true,
4065                                     extack);
4066                 if (err)
4067                         return err;
4068         } else if (!changelink) {
4069                 /* default to learn on a new device */
4070                 conf->flags |= VXLAN_F_LEARN;
4071         }
4072
4073         if (data[IFLA_VXLAN_AGEING])
4074                 conf->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
4075
4076         if (data[IFLA_VXLAN_PROXY]) {
4077                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_PROXY,
4078                                     VXLAN_F_PROXY, changelink, false,
4079                                     extack);
4080                 if (err)
4081                         return err;
4082         }
4083
4084         if (data[IFLA_VXLAN_RSC]) {
4085                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_RSC,
4086                                     VXLAN_F_RSC, changelink, false,
4087                                     extack);
4088                 if (err)
4089                         return err;
4090         }
4091
4092         if (data[IFLA_VXLAN_L2MISS]) {
4093                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_L2MISS,
4094                                     VXLAN_F_L2MISS, changelink, false,
4095                                     extack);
4096                 if (err)
4097                         return err;
4098         }
4099
4100         if (data[IFLA_VXLAN_L3MISS]) {
4101                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_L3MISS,
4102                                     VXLAN_F_L3MISS, changelink, false,
4103                                     extack);
4104                 if (err)
4105                         return err;
4106         }
4107
4108         if (data[IFLA_VXLAN_LIMIT]) {
4109                 if (changelink) {
4110                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LIMIT],
4111                                             "Cannot change limit");
4112                         return -EOPNOTSUPP;
4113                 }
4114                 conf->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
4115         }
4116
4117         if (data[IFLA_VXLAN_COLLECT_METADATA]) {
4118                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_COLLECT_METADATA,
4119                                     VXLAN_F_COLLECT_METADATA, changelink, false,
4120                                     extack);
4121                 if (err)
4122                         return err;
4123         }
4124
4125         if (data[IFLA_VXLAN_PORT_RANGE]) {
4126                 if (!changelink) {
4127                         const struct ifla_vxlan_port_range *p
4128                                 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
4129                         conf->port_min = ntohs(p->low);
4130                         conf->port_max = ntohs(p->high);
4131                 } else {
4132                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT_RANGE],
4133                                             "Cannot change port range");
4134                         return -EOPNOTSUPP;
4135                 }
4136         }
4137
4138         if (data[IFLA_VXLAN_PORT]) {
4139                 if (changelink) {
4140                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT],
4141                                             "Cannot change port");
4142                         return -EOPNOTSUPP;
4143                 }
4144                 conf->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
4145         }
4146
4147         if (data[IFLA_VXLAN_UDP_CSUM]) {
4148                 if (changelink) {
4149                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_UDP_CSUM],
4150                                             "Cannot change UDP_CSUM flag");
4151                         return -EOPNOTSUPP;
4152                 }
4153                 if (!nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
4154                         conf->flags |= VXLAN_F_UDP_ZERO_CSUM_TX;
4155         }
4156
4157         if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]) {
4158                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
4159                                     VXLAN_F_UDP_ZERO_CSUM6_TX, changelink,
4160                                     false, extack);
4161                 if (err)
4162                         return err;
4163         }
4164
4165         if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]) {
4166                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
4167                                     VXLAN_F_UDP_ZERO_CSUM6_RX, changelink,
4168                                     false, extack);
4169                 if (err)
4170                         return err;
4171         }
4172
4173         if (data[IFLA_VXLAN_REMCSUM_TX]) {
4174                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_TX,
4175                                     VXLAN_F_REMCSUM_TX, changelink, false,
4176                                     extack);
4177                 if (err)
4178                         return err;
4179         }
4180
4181         if (data[IFLA_VXLAN_REMCSUM_RX]) {
4182                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_RX,
4183                                     VXLAN_F_REMCSUM_RX, changelink, false,
4184                                     extack);
4185                 if (err)
4186                         return err;
4187         }
4188
4189         if (data[IFLA_VXLAN_GBP]) {
4190                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_GBP,
4191                                     VXLAN_F_GBP, changelink, false, extack);
4192                 if (err)
4193                         return err;
4194         }
4195
4196         if (data[IFLA_VXLAN_GPE]) {
4197                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_GPE,
4198                                     VXLAN_F_GPE, changelink, false,
4199                                     extack);
4200                 if (err)
4201                         return err;
4202         }
4203
4204         if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL]) {
4205                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_NOPARTIAL,
4206                                     VXLAN_F_REMCSUM_NOPARTIAL, changelink,
4207                                     false, extack);
4208                 if (err)
4209                         return err;
4210         }
4211
4212         if (tb[IFLA_MTU]) {
4213                 if (changelink) {
4214                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_MTU],
4215                                             "Cannot change mtu");
4216                         return -EOPNOTSUPP;
4217                 }
4218                 conf->mtu = nla_get_u32(tb[IFLA_MTU]);
4219         }
4220
4221         if (data[IFLA_VXLAN_DF])
4222                 conf->df = nla_get_u8(data[IFLA_VXLAN_DF]);
4223
4224         return 0;
4225 }
4226
4227 static int vxlan_newlink(struct net *src_net, struct net_device *dev,
4228                          struct nlattr *tb[], struct nlattr *data[],
4229                          struct netlink_ext_ack *extack)
4230 {
4231         struct vxlan_config conf;
4232         int err;
4233
4234         err = vxlan_nl2conf(tb, data, dev, &conf, false, extack);
4235         if (err)
4236                 return err;
4237
4238         return __vxlan_dev_create(src_net, dev, &conf, extack);
4239 }
4240
4241 static int vxlan_changelink(struct net_device *dev, struct nlattr *tb[],
4242                             struct nlattr *data[],
4243                             struct netlink_ext_ack *extack)
4244 {
4245         struct vxlan_dev *vxlan = netdev_priv(dev);
4246         struct net_device *lowerdev;
4247         struct vxlan_config conf;
4248         struct vxlan_rdst *dst;
4249         int err;
4250
4251         dst = &vxlan->default_dst;
4252         err = vxlan_nl2conf(tb, data, dev, &conf, true, extack);
4253         if (err)
4254                 return err;
4255
4256         err = vxlan_config_validate(vxlan->net, &conf, &lowerdev,
4257                                     vxlan, extack);
4258         if (err)
4259                 return err;
4260
4261         if (dst->remote_dev == lowerdev)
4262                 lowerdev = NULL;
4263
4264         err = netdev_adjacent_change_prepare(dst->remote_dev, lowerdev, dev,
4265                                              extack);
4266         if (err)
4267                 return err;
4268
4269         /* handle default dst entry */
4270         if (!vxlan_addr_equal(&conf.remote_ip, &dst->remote_ip)) {
4271                 u32 hash_index = fdb_head_index(vxlan, all_zeros_mac, conf.vni);
4272
4273                 spin_lock_bh(&vxlan->hash_lock[hash_index]);
4274                 if (!vxlan_addr_any(&conf.remote_ip)) {
4275                         err = vxlan_fdb_update(vxlan, all_zeros_mac,
4276                                                &conf.remote_ip,
4277                                                NUD_REACHABLE | NUD_PERMANENT,
4278                                                NLM_F_APPEND | NLM_F_CREATE,
4279                                                vxlan->cfg.dst_port,
4280                                                conf.vni, conf.vni,
4281                                                conf.remote_ifindex,
4282                                                NTF_SELF, 0, true, extack);
4283                         if (err) {
4284                                 spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4285                                 netdev_adjacent_change_abort(dst->remote_dev,
4286                                                              lowerdev, dev);
4287                                 return err;
4288                         }
4289                 }
4290                 if (!vxlan_addr_any(&dst->remote_ip))
4291                         __vxlan_fdb_delete(vxlan, all_zeros_mac,
4292                                            dst->remote_ip,
4293                                            vxlan->cfg.dst_port,
4294                                            dst->remote_vni,
4295                                            dst->remote_vni,
4296                                            dst->remote_ifindex,
4297                                            true);
4298                 spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4299         }
4300
4301         if (conf.age_interval != vxlan->cfg.age_interval)
4302                 mod_timer(&vxlan->age_timer, jiffies);
4303
4304         netdev_adjacent_change_commit(dst->remote_dev, lowerdev, dev);
4305         if (lowerdev && lowerdev != dst->remote_dev)
4306                 dst->remote_dev = lowerdev;
4307         vxlan_config_apply(dev, &conf, lowerdev, vxlan->net, true);
4308         return 0;
4309 }
4310
4311 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
4312 {
4313         struct vxlan_dev *vxlan = netdev_priv(dev);
4314
4315         vxlan_flush(vxlan, true);
4316
4317         list_del(&vxlan->next);
4318         unregister_netdevice_queue(dev, head);
4319         if (vxlan->default_dst.remote_dev)
4320                 netdev_upper_dev_unlink(vxlan->default_dst.remote_dev, dev);
4321 }
4322
4323 static size_t vxlan_get_size(const struct net_device *dev)
4324 {
4325
4326         return nla_total_size(sizeof(__u32)) +  /* IFLA_VXLAN_ID */
4327                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
4328                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
4329                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
4330                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TTL */
4331                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TTL_INHERIT */
4332                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TOS */
4333                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_DF */
4334                 nla_total_size(sizeof(__be32)) + /* IFLA_VXLAN_LABEL */
4335                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_LEARNING */
4336                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_PROXY */
4337                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_RSC */
4338                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_L2MISS */
4339                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_L3MISS */
4340                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_COLLECT_METADATA */
4341                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
4342                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
4343                 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
4344                 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
4345                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
4346                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
4347                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
4348                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
4349                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
4350                 0;
4351 }
4352
4353 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
4354 {
4355         const struct vxlan_dev *vxlan = netdev_priv(dev);
4356         const struct vxlan_rdst *dst = &vxlan->default_dst;
4357         struct ifla_vxlan_port_range ports = {
4358                 .low =  htons(vxlan->cfg.port_min),
4359                 .high = htons(vxlan->cfg.port_max),
4360         };
4361
4362         if (nla_put_u32(skb, IFLA_VXLAN_ID, be32_to_cpu(dst->remote_vni)))
4363                 goto nla_put_failure;
4364
4365         if (!vxlan_addr_any(&dst->remote_ip)) {
4366                 if (dst->remote_ip.sa.sa_family == AF_INET) {
4367                         if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP,
4368                                             dst->remote_ip.sin.sin_addr.s_addr))
4369                                 goto nla_put_failure;
4370 #if IS_ENABLED(CONFIG_IPV6)
4371                 } else {
4372                         if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6,
4373                                              &dst->remote_ip.sin6.sin6_addr))
4374                                 goto nla_put_failure;
4375 #endif
4376                 }
4377         }
4378
4379         if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
4380                 goto nla_put_failure;
4381
4382         if (!vxlan_addr_any(&vxlan->cfg.saddr)) {
4383                 if (vxlan->cfg.saddr.sa.sa_family == AF_INET) {
4384                         if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL,
4385                                             vxlan->cfg.saddr.sin.sin_addr.s_addr))
4386                                 goto nla_put_failure;
4387 #if IS_ENABLED(CONFIG_IPV6)
4388                 } else {
4389                         if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6,
4390                                              &vxlan->cfg.saddr.sin6.sin6_addr))
4391                                 goto nla_put_failure;
4392 #endif
4393                 }
4394         }
4395
4396         if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) ||
4397             nla_put_u8(skb, IFLA_VXLAN_TTL_INHERIT,
4398                        !!(vxlan->cfg.flags & VXLAN_F_TTL_INHERIT)) ||
4399             nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) ||
4400             nla_put_u8(skb, IFLA_VXLAN_DF, vxlan->cfg.df) ||
4401             nla_put_be32(skb, IFLA_VXLAN_LABEL, vxlan->cfg.label) ||
4402             nla_put_u8(skb, IFLA_VXLAN_LEARNING,
4403                        !!(vxlan->cfg.flags & VXLAN_F_LEARN)) ||
4404             nla_put_u8(skb, IFLA_VXLAN_PROXY,
4405                        !!(vxlan->cfg.flags & VXLAN_F_PROXY)) ||
4406             nla_put_u8(skb, IFLA_VXLAN_RSC,
4407                        !!(vxlan->cfg.flags & VXLAN_F_RSC)) ||
4408             nla_put_u8(skb, IFLA_VXLAN_L2MISS,
4409                        !!(vxlan->cfg.flags & VXLAN_F_L2MISS)) ||
4410             nla_put_u8(skb, IFLA_VXLAN_L3MISS,
4411                        !!(vxlan->cfg.flags & VXLAN_F_L3MISS)) ||
4412             nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA,
4413                        !!(vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)) ||
4414             nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) ||
4415             nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) ||
4416             nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) ||
4417             nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
4418                        !(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM_TX)) ||
4419             nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
4420                        !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
4421             nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
4422                        !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
4423             nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
4424                        !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_TX)) ||
4425             nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
4426                        !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_RX)))
4427                 goto nla_put_failure;
4428
4429         if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
4430                 goto nla_put_failure;
4431
4432         if (vxlan->cfg.flags & VXLAN_F_GBP &&
4433             nla_put_flag(skb, IFLA_VXLAN_GBP))
4434                 goto nla_put_failure;
4435
4436         if (vxlan->cfg.flags & VXLAN_F_GPE &&
4437             nla_put_flag(skb, IFLA_VXLAN_GPE))
4438                 goto nla_put_failure;
4439
4440         if (vxlan->cfg.flags & VXLAN_F_REMCSUM_NOPARTIAL &&
4441             nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
4442                 goto nla_put_failure;
4443
4444         return 0;
4445
4446 nla_put_failure:
4447         return -EMSGSIZE;
4448 }
4449
4450 static struct net *vxlan_get_link_net(const struct net_device *dev)
4451 {
4452         struct vxlan_dev *vxlan = netdev_priv(dev);
4453
4454         return vxlan->net;
4455 }
4456
4457 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
4458         .kind           = "vxlan",
4459         .maxtype        = IFLA_VXLAN_MAX,
4460         .policy         = vxlan_policy,
4461         .priv_size      = sizeof(struct vxlan_dev),
4462         .setup          = vxlan_setup,
4463         .validate       = vxlan_validate,
4464         .newlink        = vxlan_newlink,
4465         .changelink     = vxlan_changelink,
4466         .dellink        = vxlan_dellink,
4467         .get_size       = vxlan_get_size,
4468         .fill_info      = vxlan_fill_info,
4469         .get_link_net   = vxlan_get_link_net,
4470 };
4471
4472 struct net_device *vxlan_dev_create(struct net *net, const char *name,
4473                                     u8 name_assign_type,
4474                                     struct vxlan_config *conf)
4475 {
4476         struct nlattr *tb[IFLA_MAX + 1];
4477         struct net_device *dev;
4478         int err;
4479
4480         memset(&tb, 0, sizeof(tb));
4481
4482         dev = rtnl_create_link(net, name, name_assign_type,
4483                                &vxlan_link_ops, tb, NULL);
4484         if (IS_ERR(dev))
4485                 return dev;
4486
4487         err = __vxlan_dev_create(net, dev, conf, NULL);
4488         if (err < 0) {
4489                 free_netdev(dev);
4490                 return ERR_PTR(err);
4491         }
4492
4493         err = rtnl_configure_link(dev, NULL);
4494         if (err < 0) {
4495                 LIST_HEAD(list_kill);
4496
4497                 vxlan_dellink(dev, &list_kill);
4498                 unregister_netdevice_many(&list_kill);
4499                 return ERR_PTR(err);
4500         }
4501
4502         return dev;
4503 }
4504 EXPORT_SYMBOL_GPL(vxlan_dev_create);
4505
4506 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
4507                                              struct net_device *dev)
4508 {
4509         struct vxlan_dev *vxlan, *next;
4510         LIST_HEAD(list_kill);
4511
4512         list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
4513                 struct vxlan_rdst *dst = &vxlan->default_dst;
4514
4515                 /* In case we created vxlan device with carrier
4516                  * and we loose the carrier due to module unload
4517                  * we also need to remove vxlan device. In other
4518                  * cases, it's not necessary and remote_ifindex
4519                  * is 0 here, so no matches.
4520                  */
4521                 if (dst->remote_ifindex == dev->ifindex)
4522                         vxlan_dellink(vxlan->dev, &list_kill);
4523         }
4524
4525         unregister_netdevice_many(&list_kill);
4526 }
4527
4528 static int vxlan_netdevice_event(struct notifier_block *unused,
4529                                  unsigned long event, void *ptr)
4530 {
4531         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
4532         struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
4533
4534         if (event == NETDEV_UNREGISTER) {
4535                 if (!dev->udp_tunnel_nic_info)
4536                         vxlan_offload_rx_ports(dev, false);
4537                 vxlan_handle_lowerdev_unregister(vn, dev);
4538         } else if (event == NETDEV_REGISTER) {
4539                 if (!dev->udp_tunnel_nic_info)
4540                         vxlan_offload_rx_ports(dev, true);
4541         } else if (event == NETDEV_UDP_TUNNEL_PUSH_INFO ||
4542                    event == NETDEV_UDP_TUNNEL_DROP_INFO) {
4543                 vxlan_offload_rx_ports(dev, event == NETDEV_UDP_TUNNEL_PUSH_INFO);
4544         }
4545
4546         return NOTIFY_DONE;
4547 }
4548
4549 static struct notifier_block vxlan_notifier_block __read_mostly = {
4550         .notifier_call = vxlan_netdevice_event,
4551 };
4552
4553 static void
4554 vxlan_fdb_offloaded_set(struct net_device *dev,
4555                         struct switchdev_notifier_vxlan_fdb_info *fdb_info)
4556 {
4557         struct vxlan_dev *vxlan = netdev_priv(dev);
4558         struct vxlan_rdst *rdst;
4559         struct vxlan_fdb *f;
4560         u32 hash_index;
4561
4562         hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni);
4563
4564         spin_lock_bh(&vxlan->hash_lock[hash_index]);
4565
4566         f = vxlan_find_mac(vxlan, fdb_info->eth_addr, fdb_info->vni);
4567         if (!f)
4568                 goto out;
4569
4570         rdst = vxlan_fdb_find_rdst(f, &fdb_info->remote_ip,
4571                                    fdb_info->remote_port,
4572                                    fdb_info->remote_vni,
4573                                    fdb_info->remote_ifindex);
4574         if (!rdst)
4575                 goto out;
4576
4577         rdst->offloaded = fdb_info->offloaded;
4578
4579 out:
4580         spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4581 }
4582
4583 static int
4584 vxlan_fdb_external_learn_add(struct net_device *dev,
4585                              struct switchdev_notifier_vxlan_fdb_info *fdb_info)
4586 {
4587         struct vxlan_dev *vxlan = netdev_priv(dev);
4588         struct netlink_ext_ack *extack;
4589         u32 hash_index;
4590         int err;
4591
4592         hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni);
4593         extack = switchdev_notifier_info_to_extack(&fdb_info->info);
4594
4595         spin_lock_bh(&vxlan->hash_lock[hash_index]);
4596         err = vxlan_fdb_update(vxlan, fdb_info->eth_addr, &fdb_info->remote_ip,
4597                                NUD_REACHABLE,
4598                                NLM_F_CREATE | NLM_F_REPLACE,
4599                                fdb_info->remote_port,
4600                                fdb_info->vni,
4601                                fdb_info->remote_vni,
4602                                fdb_info->remote_ifindex,
4603                                NTF_USE | NTF_SELF | NTF_EXT_LEARNED,
4604                                0, false, extack);
4605         spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4606
4607         return err;
4608 }
4609
4610 static int
4611 vxlan_fdb_external_learn_del(struct net_device *dev,
4612                              struct switchdev_notifier_vxlan_fdb_info *fdb_info)
4613 {
4614         struct vxlan_dev *vxlan = netdev_priv(dev);
4615         struct vxlan_fdb *f;
4616         u32 hash_index;
4617         int err = 0;
4618
4619         hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni);
4620         spin_lock_bh(&vxlan->hash_lock[hash_index]);
4621
4622         f = vxlan_find_mac(vxlan, fdb_info->eth_addr, fdb_info->vni);
4623         if (!f)
4624                 err = -ENOENT;
4625         else if (f->flags & NTF_EXT_LEARNED)
4626                 err = __vxlan_fdb_delete(vxlan, fdb_info->eth_addr,
4627                                          fdb_info->remote_ip,
4628                                          fdb_info->remote_port,
4629                                          fdb_info->vni,
4630                                          fdb_info->remote_vni,
4631                                          fdb_info->remote_ifindex,
4632                                          false);
4633
4634         spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4635
4636         return err;
4637 }
4638
4639 static int vxlan_switchdev_event(struct notifier_block *unused,
4640                                  unsigned long event, void *ptr)
4641 {
4642         struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
4643         struct switchdev_notifier_vxlan_fdb_info *fdb_info;
4644         int err = 0;
4645
4646         switch (event) {
4647         case SWITCHDEV_VXLAN_FDB_OFFLOADED:
4648                 vxlan_fdb_offloaded_set(dev, ptr);
4649                 break;
4650         case SWITCHDEV_VXLAN_FDB_ADD_TO_BRIDGE:
4651                 fdb_info = ptr;
4652                 err = vxlan_fdb_external_learn_add(dev, fdb_info);
4653                 if (err) {
4654                         err = notifier_from_errno(err);
4655                         break;
4656                 }
4657                 fdb_info->offloaded = true;
4658                 vxlan_fdb_offloaded_set(dev, fdb_info);
4659                 break;
4660         case SWITCHDEV_VXLAN_FDB_DEL_TO_BRIDGE:
4661                 fdb_info = ptr;
4662                 err = vxlan_fdb_external_learn_del(dev, fdb_info);
4663                 if (err) {
4664                         err = notifier_from_errno(err);
4665                         break;
4666                 }
4667                 fdb_info->offloaded = false;
4668                 vxlan_fdb_offloaded_set(dev, fdb_info);
4669                 break;
4670         }
4671
4672         return err;
4673 }
4674
4675 static struct notifier_block vxlan_switchdev_notifier_block __read_mostly = {
4676         .notifier_call = vxlan_switchdev_event,
4677 };
4678
4679 static void vxlan_fdb_nh_flush(struct nexthop *nh)
4680 {
4681         struct vxlan_fdb *fdb;
4682         struct vxlan_dev *vxlan;
4683         u32 hash_index;
4684
4685         rcu_read_lock();
4686         list_for_each_entry_rcu(fdb, &nh->fdb_list, nh_list) {
4687                 vxlan = rcu_dereference(fdb->vdev);
4688                 WARN_ON(!vxlan);
4689                 hash_index = fdb_head_index(vxlan, fdb->eth_addr,
4690                                             vxlan->default_dst.remote_vni);
4691                 spin_lock_bh(&vxlan->hash_lock[hash_index]);
4692                 if (!hlist_unhashed(&fdb->hlist))
4693                         vxlan_fdb_destroy(vxlan, fdb, false, false);
4694                 spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4695         }
4696         rcu_read_unlock();
4697 }
4698
4699 static int vxlan_nexthop_event(struct notifier_block *nb,
4700                                unsigned long event, void *ptr)
4701 {
4702         struct nexthop *nh = ptr;
4703
4704         if (!nh || event != NEXTHOP_EVENT_DEL)
4705                 return NOTIFY_DONE;
4706
4707         vxlan_fdb_nh_flush(nh);
4708
4709         return NOTIFY_DONE;
4710 }
4711
4712 static struct notifier_block vxlan_nexthop_notifier_block __read_mostly = {
4713         .notifier_call = vxlan_nexthop_event,
4714 };
4715
4716 static __net_init int vxlan_init_net(struct net *net)
4717 {
4718         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
4719         unsigned int h;
4720
4721         INIT_LIST_HEAD(&vn->vxlan_list);
4722         spin_lock_init(&vn->sock_lock);
4723
4724         for (h = 0; h < PORT_HASH_SIZE; ++h)
4725                 INIT_HLIST_HEAD(&vn->sock_list[h]);
4726
4727         return register_nexthop_notifier(net, &vxlan_nexthop_notifier_block);
4728 }
4729
4730 static void vxlan_destroy_tunnels(struct net *net, struct list_head *head)
4731 {
4732         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
4733         struct vxlan_dev *vxlan, *next;
4734         struct net_device *dev, *aux;
4735
4736         for_each_netdev_safe(net, dev, aux)
4737                 if (dev->rtnl_link_ops == &vxlan_link_ops)
4738                         unregister_netdevice_queue(dev, head);
4739
4740         list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
4741                 /* If vxlan->dev is in the same netns, it has already been added
4742                  * to the list by the previous loop.
4743                  */
4744                 if (!net_eq(dev_net(vxlan->dev), net))
4745                         unregister_netdevice_queue(vxlan->dev, head);
4746         }
4747
4748 }
4749
4750 static void __net_exit vxlan_exit_batch_net(struct list_head *net_list)
4751 {
4752         struct net *net;
4753         LIST_HEAD(list);
4754         unsigned int h;
4755
4756         rtnl_lock();
4757         list_for_each_entry(net, net_list, exit_list)
4758                 unregister_nexthop_notifier(net, &vxlan_nexthop_notifier_block);
4759         list_for_each_entry(net, net_list, exit_list)
4760                 vxlan_destroy_tunnels(net, &list);
4761
4762         unregister_netdevice_many(&list);
4763         rtnl_unlock();
4764
4765         list_for_each_entry(net, net_list, exit_list) {
4766                 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
4767
4768                 for (h = 0; h < PORT_HASH_SIZE; ++h)
4769                         WARN_ON_ONCE(!hlist_empty(&vn->sock_list[h]));
4770         }
4771 }
4772
4773 static struct pernet_operations vxlan_net_ops = {
4774         .init = vxlan_init_net,
4775         .exit_batch = vxlan_exit_batch_net,
4776         .id   = &vxlan_net_id,
4777         .size = sizeof(struct vxlan_net),
4778 };
4779
4780 static int __init vxlan_init_module(void)
4781 {
4782         int rc;
4783
4784         get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
4785
4786         rc = register_pernet_subsys(&vxlan_net_ops);
4787         if (rc)
4788                 goto out1;
4789
4790         rc = register_netdevice_notifier(&vxlan_notifier_block);
4791         if (rc)
4792                 goto out2;
4793
4794         rc = register_switchdev_notifier(&vxlan_switchdev_notifier_block);
4795         if (rc)
4796                 goto out3;
4797
4798         rc = rtnl_link_register(&vxlan_link_ops);
4799         if (rc)
4800                 goto out4;
4801
4802         return 0;
4803 out4:
4804         unregister_switchdev_notifier(&vxlan_switchdev_notifier_block);
4805 out3:
4806         unregister_netdevice_notifier(&vxlan_notifier_block);
4807 out2:
4808         unregister_pernet_subsys(&vxlan_net_ops);
4809 out1:
4810         return rc;
4811 }
4812 late_initcall(vxlan_init_module);
4813
4814 static void __exit vxlan_cleanup_module(void)
4815 {
4816         rtnl_link_unregister(&vxlan_link_ops);
4817         unregister_switchdev_notifier(&vxlan_switchdev_notifier_block);
4818         unregister_netdevice_notifier(&vxlan_notifier_block);
4819         unregister_pernet_subsys(&vxlan_net_ops);
4820         /* rcu_barrier() is called by netns */
4821 }
4822 module_exit(vxlan_cleanup_module);
4823
4824 MODULE_LICENSE("GPL");
4825 MODULE_VERSION(VXLAN_VERSION);
4826 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
4827 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
4828 MODULE_ALIAS_RTNL_LINK("vxlan");