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         /* Get address from the outer IP header */
1782         if (vxlan_get_sk_family(vs) == AF_INET) {
1783                 saddr.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
1784                 saddr.sa.sa_family = AF_INET;
1785 #if IS_ENABLED(CONFIG_IPV6)
1786         } else {
1787                 saddr.sin6.sin6_addr = ipv6_hdr(skb)->saddr;
1788                 saddr.sa.sa_family = AF_INET6;
1789 #endif
1790         }
1791
1792         if ((vxlan->cfg.flags & VXLAN_F_LEARN) &&
1793             vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source, ifindex, vni))
1794                 return false;
1795
1796         return true;
1797 }
1798
1799 static bool vxlan_ecn_decapsulate(struct vxlan_sock *vs, void *oiph,
1800                                   struct sk_buff *skb)
1801 {
1802         int err = 0;
1803
1804         if (vxlan_get_sk_family(vs) == AF_INET)
1805                 err = IP_ECN_decapsulate(oiph, skb);
1806 #if IS_ENABLED(CONFIG_IPV6)
1807         else
1808                 err = IP6_ECN_decapsulate(oiph, skb);
1809 #endif
1810
1811         if (unlikely(err) && log_ecn_error) {
1812                 if (vxlan_get_sk_family(vs) == AF_INET)
1813                         net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1814                                              &((struct iphdr *)oiph)->saddr,
1815                                              ((struct iphdr *)oiph)->tos);
1816                 else
1817                         net_info_ratelimited("non-ECT from %pI6\n",
1818                                              &((struct ipv6hdr *)oiph)->saddr);
1819         }
1820         return err <= 1;
1821 }
1822
1823 /* Callback from net/ipv4/udp.c to receive packets */
1824 static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
1825 {
1826         struct vxlan_dev *vxlan;
1827         struct vxlan_sock *vs;
1828         struct vxlanhdr unparsed;
1829         struct vxlan_metadata _md;
1830         struct vxlan_metadata *md = &_md;
1831         __be16 protocol = htons(ETH_P_TEB);
1832         bool raw_proto = false;
1833         void *oiph;
1834         __be32 vni = 0;
1835
1836         /* Need UDP and VXLAN header to be present */
1837         if (!pskb_may_pull(skb, VXLAN_HLEN))
1838                 goto drop;
1839
1840         unparsed = *vxlan_hdr(skb);
1841         /* VNI flag always required to be set */
1842         if (!(unparsed.vx_flags & VXLAN_HF_VNI)) {
1843                 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1844                            ntohl(vxlan_hdr(skb)->vx_flags),
1845                            ntohl(vxlan_hdr(skb)->vx_vni));
1846                 /* Return non vxlan pkt */
1847                 goto drop;
1848         }
1849         unparsed.vx_flags &= ~VXLAN_HF_VNI;
1850         unparsed.vx_vni &= ~VXLAN_VNI_MASK;
1851
1852         vs = rcu_dereference_sk_user_data(sk);
1853         if (!vs)
1854                 goto drop;
1855
1856         vni = vxlan_vni(vxlan_hdr(skb)->vx_vni);
1857
1858         vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni);
1859         if (!vxlan)
1860                 goto drop;
1861
1862         /* For backwards compatibility, only allow reserved fields to be
1863          * used by VXLAN extensions if explicitly requested.
1864          */
1865         if (vs->flags & VXLAN_F_GPE) {
1866                 if (!vxlan_parse_gpe_proto(&unparsed, &protocol))
1867                         goto drop;
1868                 unparsed.vx_flags &= ~VXLAN_GPE_USED_BITS;
1869                 raw_proto = true;
1870         }
1871
1872         if (__iptunnel_pull_header(skb, VXLAN_HLEN, protocol, raw_proto,
1873                                    !net_eq(vxlan->net, dev_net(vxlan->dev))))
1874                 goto drop;
1875
1876         if (vs->flags & VXLAN_F_REMCSUM_RX)
1877                 if (unlikely(!vxlan_remcsum(&unparsed, skb, vs->flags)))
1878                         goto drop;
1879
1880         if (vxlan_collect_metadata(vs)) {
1881                 struct metadata_dst *tun_dst;
1882
1883                 tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), TUNNEL_KEY,
1884                                          key32_to_tunnel_id(vni), sizeof(*md));
1885
1886                 if (!tun_dst)
1887                         goto drop;
1888
1889                 md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
1890
1891                 skb_dst_set(skb, (struct dst_entry *)tun_dst);
1892         } else {
1893                 memset(md, 0, sizeof(*md));
1894         }
1895
1896         if (vs->flags & VXLAN_F_GBP)
1897                 vxlan_parse_gbp_hdr(&unparsed, skb, vs->flags, md);
1898         /* Note that GBP and GPE can never be active together. This is
1899          * ensured in vxlan_dev_configure.
1900          */
1901
1902         if (unparsed.vx_flags || unparsed.vx_vni) {
1903                 /* If there are any unprocessed flags remaining treat
1904                  * this as a malformed packet. This behavior diverges from
1905                  * VXLAN RFC (RFC7348) which stipulates that bits in reserved
1906                  * in reserved fields are to be ignored. The approach here
1907                  * maintains compatibility with previous stack code, and also
1908                  * is more robust and provides a little more security in
1909                  * adding extensions to VXLAN.
1910                  */
1911                 goto drop;
1912         }
1913
1914         if (!raw_proto) {
1915                 if (!vxlan_set_mac(vxlan, vs, skb, vni))
1916                         goto drop;
1917         } else {
1918                 skb_reset_mac_header(skb);
1919                 skb->dev = vxlan->dev;
1920                 skb->pkt_type = PACKET_HOST;
1921         }
1922
1923         oiph = skb_network_header(skb);
1924         skb_reset_network_header(skb);
1925
1926         if (!vxlan_ecn_decapsulate(vs, oiph, skb)) {
1927                 ++vxlan->dev->stats.rx_frame_errors;
1928                 ++vxlan->dev->stats.rx_errors;
1929                 goto drop;
1930         }
1931
1932         rcu_read_lock();
1933
1934         if (unlikely(!(vxlan->dev->flags & IFF_UP))) {
1935                 rcu_read_unlock();
1936                 atomic_long_inc(&vxlan->dev->rx_dropped);
1937                 goto drop;
1938         }
1939
1940         dev_sw_netstats_rx_add(vxlan->dev, skb->len);
1941         gro_cells_receive(&vxlan->gro_cells, skb);
1942
1943         rcu_read_unlock();
1944
1945         return 0;
1946
1947 drop:
1948         /* Consume bad packet */
1949         kfree_skb(skb);
1950         return 0;
1951 }
1952
1953 /* Callback from net/ipv{4,6}/udp.c to check that we have a VNI for errors */
1954 static int vxlan_err_lookup(struct sock *sk, struct sk_buff *skb)
1955 {
1956         struct vxlan_dev *vxlan;
1957         struct vxlan_sock *vs;
1958         struct vxlanhdr *hdr;
1959         __be32 vni;
1960
1961         if (!pskb_may_pull(skb, skb_transport_offset(skb) + VXLAN_HLEN))
1962                 return -EINVAL;
1963
1964         hdr = vxlan_hdr(skb);
1965
1966         if (!(hdr->vx_flags & VXLAN_HF_VNI))
1967                 return -EINVAL;
1968
1969         vs = rcu_dereference_sk_user_data(sk);
1970         if (!vs)
1971                 return -ENOENT;
1972
1973         vni = vxlan_vni(hdr->vx_vni);
1974         vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni);
1975         if (!vxlan)
1976                 return -ENOENT;
1977
1978         return 0;
1979 }
1980
1981 static int arp_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
1982 {
1983         struct vxlan_dev *vxlan = netdev_priv(dev);
1984         struct arphdr *parp;
1985         u8 *arpptr, *sha;
1986         __be32 sip, tip;
1987         struct neighbour *n;
1988
1989         if (dev->flags & IFF_NOARP)
1990                 goto out;
1991
1992         if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1993                 dev->stats.tx_dropped++;
1994                 goto out;
1995         }
1996         parp = arp_hdr(skb);
1997
1998         if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1999              parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
2000             parp->ar_pro != htons(ETH_P_IP) ||
2001             parp->ar_op != htons(ARPOP_REQUEST) ||
2002             parp->ar_hln != dev->addr_len ||
2003             parp->ar_pln != 4)
2004                 goto out;
2005         arpptr = (u8 *)parp + sizeof(struct arphdr);
2006         sha = arpptr;
2007         arpptr += dev->addr_len;        /* sha */
2008         memcpy(&sip, arpptr, sizeof(sip));
2009         arpptr += sizeof(sip);
2010         arpptr += dev->addr_len;        /* tha */
2011         memcpy(&tip, arpptr, sizeof(tip));
2012
2013         if (ipv4_is_loopback(tip) ||
2014             ipv4_is_multicast(tip))
2015                 goto out;
2016
2017         n = neigh_lookup(&arp_tbl, &tip, dev);
2018
2019         if (n) {
2020                 struct vxlan_fdb *f;
2021                 struct sk_buff  *reply;
2022
2023                 if (!(n->nud_state & NUD_CONNECTED)) {
2024                         neigh_release(n);
2025                         goto out;
2026                 }
2027
2028                 f = vxlan_find_mac(vxlan, n->ha, vni);
2029                 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
2030                         /* bridge-local neighbor */
2031                         neigh_release(n);
2032                         goto out;
2033                 }
2034
2035                 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
2036                                 n->ha, sha);
2037
2038                 neigh_release(n);
2039
2040                 if (reply == NULL)
2041                         goto out;
2042
2043                 skb_reset_mac_header(reply);
2044                 __skb_pull(reply, skb_network_offset(reply));
2045                 reply->ip_summed = CHECKSUM_UNNECESSARY;
2046                 reply->pkt_type = PACKET_HOST;
2047
2048                 if (netif_rx_ni(reply) == NET_RX_DROP)
2049                         dev->stats.rx_dropped++;
2050         } else if (vxlan->cfg.flags & VXLAN_F_L3MISS) {
2051                 union vxlan_addr ipa = {
2052                         .sin.sin_addr.s_addr = tip,
2053                         .sin.sin_family = AF_INET,
2054                 };
2055
2056                 vxlan_ip_miss(dev, &ipa);
2057         }
2058 out:
2059         consume_skb(skb);
2060         return NETDEV_TX_OK;
2061 }
2062
2063 #if IS_ENABLED(CONFIG_IPV6)
2064 static struct sk_buff *vxlan_na_create(struct sk_buff *request,
2065         struct neighbour *n, bool isrouter)
2066 {
2067         struct net_device *dev = request->dev;
2068         struct sk_buff *reply;
2069         struct nd_msg *ns, *na;
2070         struct ipv6hdr *pip6;
2071         u8 *daddr;
2072         int na_olen = 8; /* opt hdr + ETH_ALEN for target */
2073         int ns_olen;
2074         int i, len;
2075
2076         if (dev == NULL || !pskb_may_pull(request, request->len))
2077                 return NULL;
2078
2079         len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
2080                 sizeof(*na) + na_olen + dev->needed_tailroom;
2081         reply = alloc_skb(len, GFP_ATOMIC);
2082         if (reply == NULL)
2083                 return NULL;
2084
2085         reply->protocol = htons(ETH_P_IPV6);
2086         reply->dev = dev;
2087         skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
2088         skb_push(reply, sizeof(struct ethhdr));
2089         skb_reset_mac_header(reply);
2090
2091         ns = (struct nd_msg *)(ipv6_hdr(request) + 1);
2092
2093         daddr = eth_hdr(request)->h_source;
2094         ns_olen = request->len - skb_network_offset(request) -
2095                 sizeof(struct ipv6hdr) - sizeof(*ns);
2096         for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
2097                 if (!ns->opt[i + 1]) {
2098                         kfree_skb(reply);
2099                         return NULL;
2100                 }
2101                 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
2102                         daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
2103                         break;
2104                 }
2105         }
2106
2107         /* Ethernet header */
2108         ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
2109         ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
2110         eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
2111         reply->protocol = htons(ETH_P_IPV6);
2112
2113         skb_pull(reply, sizeof(struct ethhdr));
2114         skb_reset_network_header(reply);
2115         skb_put(reply, sizeof(struct ipv6hdr));
2116
2117         /* IPv6 header */
2118
2119         pip6 = ipv6_hdr(reply);
2120         memset(pip6, 0, sizeof(struct ipv6hdr));
2121         pip6->version = 6;
2122         pip6->priority = ipv6_hdr(request)->priority;
2123         pip6->nexthdr = IPPROTO_ICMPV6;
2124         pip6->hop_limit = 255;
2125         pip6->daddr = ipv6_hdr(request)->saddr;
2126         pip6->saddr = *(struct in6_addr *)n->primary_key;
2127
2128         skb_pull(reply, sizeof(struct ipv6hdr));
2129         skb_reset_transport_header(reply);
2130
2131         /* Neighbor Advertisement */
2132         na = skb_put_zero(reply, sizeof(*na) + na_olen);
2133         na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
2134         na->icmph.icmp6_router = isrouter;
2135         na->icmph.icmp6_override = 1;
2136         na->icmph.icmp6_solicited = 1;
2137         na->target = ns->target;
2138         ether_addr_copy(&na->opt[2], n->ha);
2139         na->opt[0] = ND_OPT_TARGET_LL_ADDR;
2140         na->opt[1] = na_olen >> 3;
2141
2142         na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
2143                 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
2144                 csum_partial(na, sizeof(*na)+na_olen, 0));
2145
2146         pip6->payload_len = htons(sizeof(*na)+na_olen);
2147
2148         skb_push(reply, sizeof(struct ipv6hdr));
2149
2150         reply->ip_summed = CHECKSUM_UNNECESSARY;
2151
2152         return reply;
2153 }
2154
2155 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
2156 {
2157         struct vxlan_dev *vxlan = netdev_priv(dev);
2158         const struct in6_addr *daddr;
2159         const struct ipv6hdr *iphdr;
2160         struct inet6_dev *in6_dev;
2161         struct neighbour *n;
2162         struct nd_msg *msg;
2163
2164         rcu_read_lock();
2165         in6_dev = __in6_dev_get(dev);
2166         if (!in6_dev)
2167                 goto out;
2168
2169         iphdr = ipv6_hdr(skb);
2170         daddr = &iphdr->daddr;
2171         msg = (struct nd_msg *)(iphdr + 1);
2172
2173         if (ipv6_addr_loopback(daddr) ||
2174             ipv6_addr_is_multicast(&msg->target))
2175                 goto out;
2176
2177         n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
2178
2179         if (n) {
2180                 struct vxlan_fdb *f;
2181                 struct sk_buff *reply;
2182
2183                 if (!(n->nud_state & NUD_CONNECTED)) {
2184                         neigh_release(n);
2185                         goto out;
2186                 }
2187
2188                 f = vxlan_find_mac(vxlan, n->ha, vni);
2189                 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
2190                         /* bridge-local neighbor */
2191                         neigh_release(n);
2192                         goto out;
2193                 }
2194
2195                 reply = vxlan_na_create(skb, n,
2196                                         !!(f ? f->flags & NTF_ROUTER : 0));
2197
2198                 neigh_release(n);
2199
2200                 if (reply == NULL)
2201                         goto out;
2202
2203                 if (netif_rx_ni(reply) == NET_RX_DROP)
2204                         dev->stats.rx_dropped++;
2205
2206         } else if (vxlan->cfg.flags & VXLAN_F_L3MISS) {
2207                 union vxlan_addr ipa = {
2208                         .sin6.sin6_addr = msg->target,
2209                         .sin6.sin6_family = AF_INET6,
2210                 };
2211
2212                 vxlan_ip_miss(dev, &ipa);
2213         }
2214
2215 out:
2216         rcu_read_unlock();
2217         consume_skb(skb);
2218         return NETDEV_TX_OK;
2219 }
2220 #endif
2221
2222 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
2223 {
2224         struct vxlan_dev *vxlan = netdev_priv(dev);
2225         struct neighbour *n;
2226
2227         if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
2228                 return false;
2229
2230         n = NULL;
2231         switch (ntohs(eth_hdr(skb)->h_proto)) {
2232         case ETH_P_IP:
2233         {
2234                 struct iphdr *pip;
2235
2236                 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
2237                         return false;
2238                 pip = ip_hdr(skb);
2239                 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
2240                 if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) {
2241                         union vxlan_addr ipa = {
2242                                 .sin.sin_addr.s_addr = pip->daddr,
2243                                 .sin.sin_family = AF_INET,
2244                         };
2245
2246                         vxlan_ip_miss(dev, &ipa);
2247                         return false;
2248                 }
2249
2250                 break;
2251         }
2252 #if IS_ENABLED(CONFIG_IPV6)
2253         case ETH_P_IPV6:
2254         {
2255                 struct ipv6hdr *pip6;
2256
2257                 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
2258                         return false;
2259                 pip6 = ipv6_hdr(skb);
2260                 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
2261                 if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) {
2262                         union vxlan_addr ipa = {
2263                                 .sin6.sin6_addr = pip6->daddr,
2264                                 .sin6.sin6_family = AF_INET6,
2265                         };
2266
2267                         vxlan_ip_miss(dev, &ipa);
2268                         return false;
2269                 }
2270
2271                 break;
2272         }
2273 #endif
2274         default:
2275                 return false;
2276         }
2277
2278         if (n) {
2279                 bool diff;
2280
2281                 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
2282                 if (diff) {
2283                         memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
2284                                 dev->addr_len);
2285                         memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
2286                 }
2287                 neigh_release(n);
2288                 return diff;
2289         }
2290
2291         return false;
2292 }
2293
2294 static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
2295                                 struct vxlan_metadata *md)
2296 {
2297         struct vxlanhdr_gbp *gbp;
2298
2299         if (!md->gbp)
2300                 return;
2301
2302         gbp = (struct vxlanhdr_gbp *)vxh;
2303         vxh->vx_flags |= VXLAN_HF_GBP;
2304
2305         if (md->gbp & VXLAN_GBP_DONT_LEARN)
2306                 gbp->dont_learn = 1;
2307
2308         if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
2309                 gbp->policy_applied = 1;
2310
2311         gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
2312 }
2313
2314 static int vxlan_build_gpe_hdr(struct vxlanhdr *vxh, u32 vxflags,
2315                                __be16 protocol)
2316 {
2317         struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)vxh;
2318
2319         gpe->np_applied = 1;
2320         gpe->next_protocol = tun_p_from_eth_p(protocol);
2321         if (!gpe->next_protocol)
2322                 return -EPFNOSUPPORT;
2323         return 0;
2324 }
2325
2326 static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst,
2327                            int iphdr_len, __be32 vni,
2328                            struct vxlan_metadata *md, u32 vxflags,
2329                            bool udp_sum)
2330 {
2331         struct vxlanhdr *vxh;
2332         int min_headroom;
2333         int err;
2334         int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
2335         __be16 inner_protocol = htons(ETH_P_TEB);
2336
2337         if ((vxflags & VXLAN_F_REMCSUM_TX) &&
2338             skb->ip_summed == CHECKSUM_PARTIAL) {
2339                 int csum_start = skb_checksum_start_offset(skb);
2340
2341                 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
2342                     !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
2343                     (skb->csum_offset == offsetof(struct udphdr, check) ||
2344                      skb->csum_offset == offsetof(struct tcphdr, check)))
2345                         type |= SKB_GSO_TUNNEL_REMCSUM;
2346         }
2347
2348         min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
2349                         + VXLAN_HLEN + iphdr_len;
2350
2351         /* Need space for new headers (invalidates iph ptr) */
2352         err = skb_cow_head(skb, min_headroom);
2353         if (unlikely(err))
2354                 return err;
2355
2356         err = iptunnel_handle_offloads(skb, type);
2357         if (err)
2358                 return err;
2359
2360         vxh = __skb_push(skb, sizeof(*vxh));
2361         vxh->vx_flags = VXLAN_HF_VNI;
2362         vxh->vx_vni = vxlan_vni_field(vni);
2363
2364         if (type & SKB_GSO_TUNNEL_REMCSUM) {
2365                 unsigned int start;
2366
2367                 start = skb_checksum_start_offset(skb) - sizeof(struct vxlanhdr);
2368                 vxh->vx_vni |= vxlan_compute_rco(start, skb->csum_offset);
2369                 vxh->vx_flags |= VXLAN_HF_RCO;
2370
2371                 if (!skb_is_gso(skb)) {
2372                         skb->ip_summed = CHECKSUM_NONE;
2373                         skb->encapsulation = 0;
2374                 }
2375         }
2376
2377         if (vxflags & VXLAN_F_GBP)
2378                 vxlan_build_gbp_hdr(vxh, vxflags, md);
2379         if (vxflags & VXLAN_F_GPE) {
2380                 err = vxlan_build_gpe_hdr(vxh, vxflags, skb->protocol);
2381                 if (err < 0)
2382                         return err;
2383                 inner_protocol = skb->protocol;
2384         }
2385
2386         skb_set_inner_protocol(skb, inner_protocol);
2387         return 0;
2388 }
2389
2390 static struct rtable *vxlan_get_route(struct vxlan_dev *vxlan, struct net_device *dev,
2391                                       struct vxlan_sock *sock4,
2392                                       struct sk_buff *skb, int oif, u8 tos,
2393                                       __be32 daddr, __be32 *saddr, __be16 dport, __be16 sport,
2394                                       struct dst_cache *dst_cache,
2395                                       const struct ip_tunnel_info *info)
2396 {
2397         bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
2398         struct rtable *rt = NULL;
2399         struct flowi4 fl4;
2400
2401         if (!sock4)
2402                 return ERR_PTR(-EIO);
2403
2404         if (tos && !info)
2405                 use_cache = false;
2406         if (use_cache) {
2407                 rt = dst_cache_get_ip4(dst_cache, saddr);
2408                 if (rt)
2409                         return rt;
2410         }
2411
2412         memset(&fl4, 0, sizeof(fl4));
2413         fl4.flowi4_oif = oif;
2414         fl4.flowi4_tos = RT_TOS(tos);
2415         fl4.flowi4_mark = skb->mark;
2416         fl4.flowi4_proto = IPPROTO_UDP;
2417         fl4.daddr = daddr;
2418         fl4.saddr = *saddr;
2419         fl4.fl4_dport = dport;
2420         fl4.fl4_sport = sport;
2421
2422         rt = ip_route_output_key(vxlan->net, &fl4);
2423         if (!IS_ERR(rt)) {
2424                 if (rt->dst.dev == dev) {
2425                         netdev_dbg(dev, "circular route to %pI4\n", &daddr);
2426                         ip_rt_put(rt);
2427                         return ERR_PTR(-ELOOP);
2428                 }
2429
2430                 *saddr = fl4.saddr;
2431                 if (use_cache)
2432                         dst_cache_set_ip4(dst_cache, &rt->dst, fl4.saddr);
2433         } else {
2434                 netdev_dbg(dev, "no route to %pI4\n", &daddr);
2435                 return ERR_PTR(-ENETUNREACH);
2436         }
2437         return rt;
2438 }
2439
2440 #if IS_ENABLED(CONFIG_IPV6)
2441 static struct dst_entry *vxlan6_get_route(struct vxlan_dev *vxlan,
2442                                           struct net_device *dev,
2443                                           struct vxlan_sock *sock6,
2444                                           struct sk_buff *skb, int oif, u8 tos,
2445                                           __be32 label,
2446                                           const struct in6_addr *daddr,
2447                                           struct in6_addr *saddr,
2448                                           __be16 dport, __be16 sport,
2449                                           struct dst_cache *dst_cache,
2450                                           const struct ip_tunnel_info *info)
2451 {
2452         bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
2453         struct dst_entry *ndst;
2454         struct flowi6 fl6;
2455
2456         if (!sock6)
2457                 return ERR_PTR(-EIO);
2458
2459         if (tos && !info)
2460                 use_cache = false;
2461         if (use_cache) {
2462                 ndst = dst_cache_get_ip6(dst_cache, saddr);
2463                 if (ndst)
2464                         return ndst;
2465         }
2466
2467         memset(&fl6, 0, sizeof(fl6));
2468         fl6.flowi6_oif = oif;
2469         fl6.daddr = *daddr;
2470         fl6.saddr = *saddr;
2471         fl6.flowlabel = ip6_make_flowinfo(RT_TOS(tos), label);
2472         fl6.flowi6_mark = skb->mark;
2473         fl6.flowi6_proto = IPPROTO_UDP;
2474         fl6.fl6_dport = dport;
2475         fl6.fl6_sport = sport;
2476
2477         ndst = ipv6_stub->ipv6_dst_lookup_flow(vxlan->net, sock6->sock->sk,
2478                                                &fl6, NULL);
2479         if (unlikely(IS_ERR(ndst))) {
2480                 netdev_dbg(dev, "no route to %pI6\n", daddr);
2481                 return ERR_PTR(-ENETUNREACH);
2482         }
2483
2484         if (unlikely(ndst->dev == dev)) {
2485                 netdev_dbg(dev, "circular route to %pI6\n", daddr);
2486                 dst_release(ndst);
2487                 return ERR_PTR(-ELOOP);
2488         }
2489
2490         *saddr = fl6.saddr;
2491         if (use_cache)
2492                 dst_cache_set_ip6(dst_cache, ndst, saddr);
2493         return ndst;
2494 }
2495 #endif
2496
2497 /* Bypass encapsulation if the destination is local */
2498 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
2499                                struct vxlan_dev *dst_vxlan, __be32 vni,
2500                                bool snoop)
2501 {
2502         struct pcpu_sw_netstats *tx_stats, *rx_stats;
2503         union vxlan_addr loopback;
2504         union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
2505         struct net_device *dev;
2506         int len = skb->len;
2507
2508         tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
2509         rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
2510         skb->pkt_type = PACKET_HOST;
2511         skb->encapsulation = 0;
2512         skb->dev = dst_vxlan->dev;
2513         __skb_pull(skb, skb_network_offset(skb));
2514
2515         if (remote_ip->sa.sa_family == AF_INET) {
2516                 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
2517                 loopback.sa.sa_family =  AF_INET;
2518 #if IS_ENABLED(CONFIG_IPV6)
2519         } else {
2520                 loopback.sin6.sin6_addr = in6addr_loopback;
2521                 loopback.sa.sa_family =  AF_INET6;
2522 #endif
2523         }
2524
2525         rcu_read_lock();
2526         dev = skb->dev;
2527         if (unlikely(!(dev->flags & IFF_UP))) {
2528                 kfree_skb(skb);
2529                 goto drop;
2530         }
2531
2532         if ((dst_vxlan->cfg.flags & VXLAN_F_LEARN) && snoop)
2533                 vxlan_snoop(dev, &loopback, eth_hdr(skb)->h_source, 0, vni);
2534
2535         u64_stats_update_begin(&tx_stats->syncp);
2536         tx_stats->tx_packets++;
2537         tx_stats->tx_bytes += len;
2538         u64_stats_update_end(&tx_stats->syncp);
2539
2540         if (netif_rx(skb) == NET_RX_SUCCESS) {
2541                 u64_stats_update_begin(&rx_stats->syncp);
2542                 rx_stats->rx_packets++;
2543                 rx_stats->rx_bytes += len;
2544                 u64_stats_update_end(&rx_stats->syncp);
2545         } else {
2546 drop:
2547                 dev->stats.rx_dropped++;
2548         }
2549         rcu_read_unlock();
2550 }
2551
2552 static int encap_bypass_if_local(struct sk_buff *skb, struct net_device *dev,
2553                                  struct vxlan_dev *vxlan,
2554                                  union vxlan_addr *daddr,
2555                                  __be16 dst_port, int dst_ifindex, __be32 vni,
2556                                  struct dst_entry *dst,
2557                                  u32 rt_flags)
2558 {
2559 #if IS_ENABLED(CONFIG_IPV6)
2560         /* IPv6 rt-flags are checked against RTF_LOCAL, but the value of
2561          * RTF_LOCAL is equal to RTCF_LOCAL. So to keep code simple
2562          * we can use RTCF_LOCAL which works for ipv4 and ipv6 route entry.
2563          */
2564         BUILD_BUG_ON(RTCF_LOCAL != RTF_LOCAL);
2565 #endif
2566         /* Bypass encapsulation if the destination is local */
2567         if (rt_flags & RTCF_LOCAL &&
2568             !(rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2569                 struct vxlan_dev *dst_vxlan;
2570
2571                 dst_release(dst);
2572                 dst_vxlan = vxlan_find_vni(vxlan->net, dst_ifindex, vni,
2573                                            daddr->sa.sa_family, dst_port,
2574                                            vxlan->cfg.flags);
2575                 if (!dst_vxlan) {
2576                         dev->stats.tx_errors++;
2577                         kfree_skb(skb);
2578
2579                         return -ENOENT;
2580                 }
2581                 vxlan_encap_bypass(skb, vxlan, dst_vxlan, vni, true);
2582                 return 1;
2583         }
2584
2585         return 0;
2586 }
2587
2588 static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
2589                            __be32 default_vni, struct vxlan_rdst *rdst,
2590                            bool did_rsc)
2591 {
2592         struct dst_cache *dst_cache;
2593         struct ip_tunnel_info *info;
2594         struct vxlan_dev *vxlan = netdev_priv(dev);
2595         const struct iphdr *old_iph = ip_hdr(skb);
2596         union vxlan_addr *dst;
2597         union vxlan_addr remote_ip, local_ip;
2598         struct vxlan_metadata _md;
2599         struct vxlan_metadata *md = &_md;
2600         __be16 src_port = 0, dst_port;
2601         struct dst_entry *ndst = NULL;
2602         __be32 vni, label;
2603         __u8 tos, ttl;
2604         int ifindex;
2605         int err;
2606         u32 flags = vxlan->cfg.flags;
2607         bool udp_sum = false;
2608         bool xnet = !net_eq(vxlan->net, dev_net(vxlan->dev));
2609
2610         info = skb_tunnel_info(skb);
2611
2612         if (rdst) {
2613                 dst = &rdst->remote_ip;
2614                 if (vxlan_addr_any(dst)) {
2615                         if (did_rsc) {
2616                                 /* short-circuited back to local bridge */
2617                                 vxlan_encap_bypass(skb, vxlan, vxlan,
2618                                                    default_vni, true);
2619                                 return;
2620                         }
2621                         goto drop;
2622                 }
2623
2624                 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port;
2625                 vni = (rdst->remote_vni) ? : default_vni;
2626                 ifindex = rdst->remote_ifindex;
2627                 local_ip = vxlan->cfg.saddr;
2628                 dst_cache = &rdst->dst_cache;
2629                 md->gbp = skb->mark;
2630                 if (flags & VXLAN_F_TTL_INHERIT) {
2631                         ttl = ip_tunnel_get_ttl(old_iph, skb);
2632                 } else {
2633                         ttl = vxlan->cfg.ttl;
2634                         if (!ttl && vxlan_addr_multicast(dst))
2635                                 ttl = 1;
2636                 }
2637
2638                 tos = vxlan->cfg.tos;
2639                 if (tos == 1)
2640                         tos = ip_tunnel_get_dsfield(old_iph, skb);
2641
2642                 if (dst->sa.sa_family == AF_INET)
2643                         udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM_TX);
2644                 else
2645                         udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX);
2646                 label = vxlan->cfg.label;
2647         } else {
2648                 if (!info) {
2649                         WARN_ONCE(1, "%s: Missing encapsulation instructions\n",
2650                                   dev->name);
2651                         goto drop;
2652                 }
2653                 remote_ip.sa.sa_family = ip_tunnel_info_af(info);
2654                 if (remote_ip.sa.sa_family == AF_INET) {
2655                         remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst;
2656                         local_ip.sin.sin_addr.s_addr = info->key.u.ipv4.src;
2657                 } else {
2658                         remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst;
2659                         local_ip.sin6.sin6_addr = info->key.u.ipv6.src;
2660                 }
2661                 dst = &remote_ip;
2662                 dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port;
2663                 vni = tunnel_id_to_key32(info->key.tun_id);
2664                 ifindex = 0;
2665                 dst_cache = &info->dst_cache;
2666                 if (info->key.tun_flags & TUNNEL_VXLAN_OPT) {
2667                         if (info->options_len < sizeof(*md))
2668                                 goto drop;
2669                         md = ip_tunnel_info_opts(info);
2670                 }
2671                 ttl = info->key.ttl;
2672                 tos = info->key.tos;
2673                 label = info->key.label;
2674                 udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
2675         }
2676         src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2677                                      vxlan->cfg.port_max, true);
2678
2679         rcu_read_lock();
2680         if (dst->sa.sa_family == AF_INET) {
2681                 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
2682                 struct rtable *rt;
2683                 __be16 df = 0;
2684
2685                 if (!ifindex)
2686                         ifindex = sock4->sock->sk->sk_bound_dev_if;
2687
2688                 rt = vxlan_get_route(vxlan, dev, sock4, skb, ifindex, tos,
2689                                      dst->sin.sin_addr.s_addr,
2690                                      &local_ip.sin.sin_addr.s_addr,
2691                                      dst_port, src_port,
2692                                      dst_cache, info);
2693                 if (IS_ERR(rt)) {
2694                         err = PTR_ERR(rt);
2695                         goto tx_error;
2696                 }
2697
2698                 if (!info) {
2699                         /* Bypass encapsulation if the destination is local */
2700                         err = encap_bypass_if_local(skb, dev, vxlan, dst,
2701                                                     dst_port, ifindex, vni,
2702                                                     &rt->dst, rt->rt_flags);
2703                         if (err)
2704                                 goto out_unlock;
2705
2706                         if (vxlan->cfg.df == VXLAN_DF_SET) {
2707                                 df = htons(IP_DF);
2708                         } else if (vxlan->cfg.df == VXLAN_DF_INHERIT) {
2709                                 struct ethhdr *eth = eth_hdr(skb);
2710
2711                                 if (ntohs(eth->h_proto) == ETH_P_IPV6 ||
2712                                     (ntohs(eth->h_proto) == ETH_P_IP &&
2713                                      old_iph->frag_off & htons(IP_DF)))
2714                                         df = htons(IP_DF);
2715                         }
2716                 } else if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT) {
2717                         df = htons(IP_DF);
2718                 }
2719
2720                 ndst = &rt->dst;
2721                 err = skb_tunnel_check_pmtu(skb, ndst, vxlan_headroom(flags & VXLAN_F_GPE),
2722                                             netif_is_any_bridge_port(dev));
2723                 if (err < 0) {
2724                         goto tx_error;
2725                 } else if (err) {
2726                         if (info) {
2727                                 struct ip_tunnel_info *unclone;
2728                                 struct in_addr src, dst;
2729
2730                                 unclone = skb_tunnel_info_unclone(skb);
2731                                 if (unlikely(!unclone))
2732                                         goto tx_error;
2733
2734                                 src = remote_ip.sin.sin_addr;
2735                                 dst = local_ip.sin.sin_addr;
2736                                 unclone->key.u.ipv4.src = src.s_addr;
2737                                 unclone->key.u.ipv4.dst = dst.s_addr;
2738                         }
2739                         vxlan_encap_bypass(skb, vxlan, vxlan, vni, false);
2740                         dst_release(ndst);
2741                         goto out_unlock;
2742                 }
2743
2744                 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2745                 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
2746                 err = vxlan_build_skb(skb, ndst, sizeof(struct iphdr),
2747                                       vni, md, flags, udp_sum);
2748                 if (err < 0)
2749                         goto tx_error;
2750
2751                 udp_tunnel_xmit_skb(rt, sock4->sock->sk, skb, local_ip.sin.sin_addr.s_addr,
2752                                     dst->sin.sin_addr.s_addr, tos, ttl, df,
2753                                     src_port, dst_port, xnet, !udp_sum);
2754 #if IS_ENABLED(CONFIG_IPV6)
2755         } else {
2756                 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
2757
2758                 if (!ifindex)
2759                         ifindex = sock6->sock->sk->sk_bound_dev_if;
2760
2761                 ndst = vxlan6_get_route(vxlan, dev, sock6, skb, ifindex, tos,
2762                                         label, &dst->sin6.sin6_addr,
2763                                         &local_ip.sin6.sin6_addr,
2764                                         dst_port, src_port,
2765                                         dst_cache, info);
2766                 if (IS_ERR(ndst)) {
2767                         err = PTR_ERR(ndst);
2768                         ndst = NULL;
2769                         goto tx_error;
2770                 }
2771
2772                 if (!info) {
2773                         u32 rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags;
2774
2775                         err = encap_bypass_if_local(skb, dev, vxlan, dst,
2776                                                     dst_port, ifindex, vni,
2777                                                     ndst, rt6i_flags);
2778                         if (err)
2779                                 goto out_unlock;
2780                 }
2781
2782                 err = skb_tunnel_check_pmtu(skb, ndst,
2783                                             vxlan_headroom((flags & VXLAN_F_GPE) | VXLAN_F_IPV6),
2784                                             netif_is_any_bridge_port(dev));
2785                 if (err < 0) {
2786                         goto tx_error;
2787                 } else if (err) {
2788                         if (info) {
2789                                 struct ip_tunnel_info *unclone;
2790                                 struct in6_addr src, dst;
2791
2792                                 unclone = skb_tunnel_info_unclone(skb);
2793                                 if (unlikely(!unclone))
2794                                         goto tx_error;
2795
2796                                 src = remote_ip.sin6.sin6_addr;
2797                                 dst = local_ip.sin6.sin6_addr;
2798                                 unclone->key.u.ipv6.src = src;
2799                                 unclone->key.u.ipv6.dst = dst;
2800                         }
2801
2802                         vxlan_encap_bypass(skb, vxlan, vxlan, vni, false);
2803                         dst_release(ndst);
2804                         goto out_unlock;
2805                 }
2806
2807                 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2808                 ttl = ttl ? : ip6_dst_hoplimit(ndst);
2809                 skb_scrub_packet(skb, xnet);
2810                 err = vxlan_build_skb(skb, ndst, sizeof(struct ipv6hdr),
2811                                       vni, md, flags, udp_sum);
2812                 if (err < 0)
2813                         goto tx_error;
2814
2815                 udp_tunnel6_xmit_skb(ndst, sock6->sock->sk, skb, dev,
2816                                      &local_ip.sin6.sin6_addr,
2817                                      &dst->sin6.sin6_addr, tos, ttl,
2818                                      label, src_port, dst_port, !udp_sum);
2819 #endif
2820         }
2821 out_unlock:
2822         rcu_read_unlock();
2823         return;
2824
2825 drop:
2826         dev->stats.tx_dropped++;
2827         dev_kfree_skb(skb);
2828         return;
2829
2830 tx_error:
2831         rcu_read_unlock();
2832         if (err == -ELOOP)
2833                 dev->stats.collisions++;
2834         else if (err == -ENETUNREACH)
2835                 dev->stats.tx_carrier_errors++;
2836         dst_release(ndst);
2837         dev->stats.tx_errors++;
2838         kfree_skb(skb);
2839 }
2840
2841 static void vxlan_xmit_nh(struct sk_buff *skb, struct net_device *dev,
2842                           struct vxlan_fdb *f, __be32 vni, bool did_rsc)
2843 {
2844         struct vxlan_rdst nh_rdst;
2845         struct nexthop *nh;
2846         bool do_xmit;
2847         u32 hash;
2848
2849         memset(&nh_rdst, 0, sizeof(struct vxlan_rdst));
2850         hash = skb_get_hash(skb);
2851
2852         rcu_read_lock();
2853         nh = rcu_dereference(f->nh);
2854         if (!nh) {
2855                 rcu_read_unlock();
2856                 goto drop;
2857         }
2858         do_xmit = vxlan_fdb_nh_path_select(nh, hash, &nh_rdst);
2859         rcu_read_unlock();
2860
2861         if (likely(do_xmit))
2862                 vxlan_xmit_one(skb, dev, vni, &nh_rdst, did_rsc);
2863         else
2864                 goto drop;
2865
2866         return;
2867
2868 drop:
2869         dev->stats.tx_dropped++;
2870         dev_kfree_skb(skb);
2871 }
2872
2873 /* Transmit local packets over Vxlan
2874  *
2875  * Outer IP header inherits ECN and DF from inner header.
2876  * Outer UDP destination is the VXLAN assigned port.
2877  *           source port is based on hash of flow
2878  */
2879 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
2880 {
2881         struct vxlan_dev *vxlan = netdev_priv(dev);
2882         struct vxlan_rdst *rdst, *fdst = NULL;
2883         const struct ip_tunnel_info *info;
2884         bool did_rsc = false;
2885         struct vxlan_fdb *f;
2886         struct ethhdr *eth;
2887         __be32 vni = 0;
2888
2889         info = skb_tunnel_info(skb);
2890
2891         skb_reset_mac_header(skb);
2892
2893         if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) {
2894                 if (info && info->mode & IP_TUNNEL_INFO_BRIDGE &&
2895                     info->mode & IP_TUNNEL_INFO_TX) {
2896                         vni = tunnel_id_to_key32(info->key.tun_id);
2897                 } else {
2898                         if (info && info->mode & IP_TUNNEL_INFO_TX)
2899                                 vxlan_xmit_one(skb, dev, vni, NULL, false);
2900                         else
2901                                 kfree_skb(skb);
2902                         return NETDEV_TX_OK;
2903                 }
2904         }
2905
2906         if (vxlan->cfg.flags & VXLAN_F_PROXY) {
2907                 eth = eth_hdr(skb);
2908                 if (ntohs(eth->h_proto) == ETH_P_ARP)
2909                         return arp_reduce(dev, skb, vni);
2910 #if IS_ENABLED(CONFIG_IPV6)
2911                 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
2912                          pskb_may_pull(skb, sizeof(struct ipv6hdr) +
2913                                             sizeof(struct nd_msg)) &&
2914                          ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
2915                         struct nd_msg *m = (struct nd_msg *)(ipv6_hdr(skb) + 1);
2916
2917                         if (m->icmph.icmp6_code == 0 &&
2918                             m->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
2919                                 return neigh_reduce(dev, skb, vni);
2920                 }
2921 #endif
2922         }
2923
2924         eth = eth_hdr(skb);
2925         f = vxlan_find_mac(vxlan, eth->h_dest, vni);
2926         did_rsc = false;
2927
2928         if (f && (f->flags & NTF_ROUTER) && (vxlan->cfg.flags & VXLAN_F_RSC) &&
2929             (ntohs(eth->h_proto) == ETH_P_IP ||
2930              ntohs(eth->h_proto) == ETH_P_IPV6)) {
2931                 did_rsc = route_shortcircuit(dev, skb);
2932                 if (did_rsc)
2933                         f = vxlan_find_mac(vxlan, eth->h_dest, vni);
2934         }
2935
2936         if (f == NULL) {
2937                 f = vxlan_find_mac(vxlan, all_zeros_mac, vni);
2938                 if (f == NULL) {
2939                         if ((vxlan->cfg.flags & VXLAN_F_L2MISS) &&
2940                             !is_multicast_ether_addr(eth->h_dest))
2941                                 vxlan_fdb_miss(vxlan, eth->h_dest);
2942
2943                         dev->stats.tx_dropped++;
2944                         kfree_skb(skb);
2945                         return NETDEV_TX_OK;
2946                 }
2947         }
2948
2949         if (rcu_access_pointer(f->nh)) {
2950                 vxlan_xmit_nh(skb, dev, f,
2951                               (vni ? : vxlan->default_dst.remote_vni), did_rsc);
2952         } else {
2953                 list_for_each_entry_rcu(rdst, &f->remotes, list) {
2954                         struct sk_buff *skb1;
2955
2956                         if (!fdst) {
2957                                 fdst = rdst;
2958                                 continue;
2959                         }
2960                         skb1 = skb_clone(skb, GFP_ATOMIC);
2961                         if (skb1)
2962                                 vxlan_xmit_one(skb1, dev, vni, rdst, did_rsc);
2963                 }
2964                 if (fdst)
2965                         vxlan_xmit_one(skb, dev, vni, fdst, did_rsc);
2966                 else
2967                         kfree_skb(skb);
2968         }
2969
2970         return NETDEV_TX_OK;
2971 }
2972
2973 /* Walk the forwarding table and purge stale entries */
2974 static void vxlan_cleanup(struct timer_list *t)
2975 {
2976         struct vxlan_dev *vxlan = from_timer(vxlan, t, age_timer);
2977         unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2978         unsigned int h;
2979
2980         if (!netif_running(vxlan->dev))
2981                 return;
2982
2983         for (h = 0; h < FDB_HASH_SIZE; ++h) {
2984                 struct hlist_node *p, *n;
2985
2986                 spin_lock(&vxlan->hash_lock[h]);
2987                 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2988                         struct vxlan_fdb *f
2989                                 = container_of(p, struct vxlan_fdb, hlist);
2990                         unsigned long timeout;
2991
2992                         if (f->state & (NUD_PERMANENT | NUD_NOARP))
2993                                 continue;
2994
2995                         if (f->flags & NTF_EXT_LEARNED)
2996                                 continue;
2997
2998                         timeout = f->used + vxlan->cfg.age_interval * HZ;
2999                         if (time_before_eq(timeout, jiffies)) {
3000                                 netdev_dbg(vxlan->dev,
3001                                            "garbage collect %pM\n",
3002                                            f->eth_addr);
3003                                 f->state = NUD_STALE;
3004                                 vxlan_fdb_destroy(vxlan, f, true, true);
3005                         } else if (time_before(timeout, next_timer))
3006                                 next_timer = timeout;
3007                 }
3008                 spin_unlock(&vxlan->hash_lock[h]);
3009         }
3010
3011         mod_timer(&vxlan->age_timer, next_timer);
3012 }
3013
3014 static void vxlan_vs_del_dev(struct vxlan_dev *vxlan)
3015 {
3016         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
3017
3018         spin_lock(&vn->sock_lock);
3019         hlist_del_init_rcu(&vxlan->hlist4.hlist);
3020 #if IS_ENABLED(CONFIG_IPV6)
3021         hlist_del_init_rcu(&vxlan->hlist6.hlist);
3022 #endif
3023         spin_unlock(&vn->sock_lock);
3024 }
3025
3026 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan,
3027                              struct vxlan_dev_node *node)
3028 {
3029         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
3030         __be32 vni = vxlan->default_dst.remote_vni;
3031
3032         node->vxlan = vxlan;
3033         spin_lock(&vn->sock_lock);
3034         hlist_add_head_rcu(&node->hlist, vni_head(vs, vni));
3035         spin_unlock(&vn->sock_lock);
3036 }
3037
3038 /* Setup stats when device is created */
3039 static int vxlan_init(struct net_device *dev)
3040 {
3041         struct vxlan_dev *vxlan = netdev_priv(dev);
3042         int err;
3043
3044         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
3045         if (!dev->tstats)
3046                 return -ENOMEM;
3047
3048         err = gro_cells_init(&vxlan->gro_cells, dev);
3049         if (err) {
3050                 free_percpu(dev->tstats);
3051                 return err;
3052         }
3053
3054         return 0;
3055 }
3056
3057 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan, __be32 vni)
3058 {
3059         struct vxlan_fdb *f;
3060         u32 hash_index = fdb_head_index(vxlan, all_zeros_mac, vni);
3061
3062         spin_lock_bh(&vxlan->hash_lock[hash_index]);
3063         f = __vxlan_find_mac(vxlan, all_zeros_mac, vni);
3064         if (f)
3065                 vxlan_fdb_destroy(vxlan, f, true, true);
3066         spin_unlock_bh(&vxlan->hash_lock[hash_index]);
3067 }
3068
3069 static void vxlan_uninit(struct net_device *dev)
3070 {
3071         struct vxlan_dev *vxlan = netdev_priv(dev);
3072
3073         gro_cells_destroy(&vxlan->gro_cells);
3074
3075         vxlan_fdb_delete_default(vxlan, vxlan->cfg.vni);
3076
3077         free_percpu(dev->tstats);
3078 }
3079
3080 /* Start ageing timer and join group when device is brought up */
3081 static int vxlan_open(struct net_device *dev)
3082 {
3083         struct vxlan_dev *vxlan = netdev_priv(dev);
3084         int ret;
3085
3086         ret = vxlan_sock_add(vxlan);
3087         if (ret < 0)
3088                 return ret;
3089
3090         if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
3091                 ret = vxlan_igmp_join(vxlan);
3092                 if (ret == -EADDRINUSE)
3093                         ret = 0;
3094                 if (ret) {
3095                         vxlan_sock_release(vxlan);
3096                         return ret;
3097                 }
3098         }
3099
3100         if (vxlan->cfg.age_interval)
3101                 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
3102
3103         return ret;
3104 }
3105
3106 /* Purge the forwarding table */
3107 static void vxlan_flush(struct vxlan_dev *vxlan, bool do_all)
3108 {
3109         unsigned int h;
3110
3111         for (h = 0; h < FDB_HASH_SIZE; ++h) {
3112                 struct hlist_node *p, *n;
3113
3114                 spin_lock_bh(&vxlan->hash_lock[h]);
3115                 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
3116                         struct vxlan_fdb *f
3117                                 = container_of(p, struct vxlan_fdb, hlist);
3118                         if (!do_all && (f->state & (NUD_PERMANENT | NUD_NOARP)))
3119                                 continue;
3120                         /* the all_zeros_mac entry is deleted at vxlan_uninit */
3121                         if (is_zero_ether_addr(f->eth_addr) &&
3122                             f->vni == vxlan->cfg.vni)
3123                                 continue;
3124                         vxlan_fdb_destroy(vxlan, f, true, true);
3125                 }
3126                 spin_unlock_bh(&vxlan->hash_lock[h]);
3127         }
3128 }
3129
3130 /* Cleanup timer and forwarding table on shutdown */
3131 static int vxlan_stop(struct net_device *dev)
3132 {
3133         struct vxlan_dev *vxlan = netdev_priv(dev);
3134         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
3135         int ret = 0;
3136
3137         if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
3138             !vxlan_group_used(vn, vxlan))
3139                 ret = vxlan_igmp_leave(vxlan);
3140
3141         del_timer_sync(&vxlan->age_timer);
3142
3143         vxlan_flush(vxlan, false);
3144         vxlan_sock_release(vxlan);
3145
3146         return ret;
3147 }
3148
3149 /* Stub, nothing needs to be done. */
3150 static void vxlan_set_multicast_list(struct net_device *dev)
3151 {
3152 }
3153
3154 static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
3155 {
3156         struct vxlan_dev *vxlan = netdev_priv(dev);
3157         struct vxlan_rdst *dst = &vxlan->default_dst;
3158         struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
3159                                                          dst->remote_ifindex);
3160
3161         /* This check is different than dev->max_mtu, because it looks at
3162          * the lowerdev->mtu, rather than the static dev->max_mtu
3163          */
3164         if (lowerdev) {
3165                 int max_mtu = lowerdev->mtu - vxlan_headroom(vxlan->cfg.flags);
3166                 if (new_mtu > max_mtu)
3167                         return -EINVAL;
3168         }
3169
3170         dev->mtu = new_mtu;
3171         return 0;
3172 }
3173
3174 static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
3175 {
3176         struct vxlan_dev *vxlan = netdev_priv(dev);
3177         struct ip_tunnel_info *info = skb_tunnel_info(skb);
3178         __be16 sport, dport;
3179
3180         sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
3181                                   vxlan->cfg.port_max, true);
3182         dport = info->key.tp_dst ? : vxlan->cfg.dst_port;
3183
3184         if (ip_tunnel_info_af(info) == AF_INET) {
3185                 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
3186                 struct rtable *rt;
3187
3188                 rt = vxlan_get_route(vxlan, dev, sock4, skb, 0, info->key.tos,
3189                                      info->key.u.ipv4.dst,
3190                                      &info->key.u.ipv4.src, dport, sport,
3191                                      &info->dst_cache, info);
3192                 if (IS_ERR(rt))
3193                         return PTR_ERR(rt);
3194                 ip_rt_put(rt);
3195         } else {
3196 #if IS_ENABLED(CONFIG_IPV6)
3197                 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
3198                 struct dst_entry *ndst;
3199
3200                 ndst = vxlan6_get_route(vxlan, dev, sock6, skb, 0, info->key.tos,
3201                                         info->key.label, &info->key.u.ipv6.dst,
3202                                         &info->key.u.ipv6.src, dport, sport,
3203                                         &info->dst_cache, info);
3204                 if (IS_ERR(ndst))
3205                         return PTR_ERR(ndst);
3206                 dst_release(ndst);
3207 #else /* !CONFIG_IPV6 */
3208                 return -EPFNOSUPPORT;
3209 #endif
3210         }
3211         info->key.tp_src = sport;
3212         info->key.tp_dst = dport;
3213         return 0;
3214 }
3215
3216 static const struct net_device_ops vxlan_netdev_ether_ops = {
3217         .ndo_init               = vxlan_init,
3218         .ndo_uninit             = vxlan_uninit,
3219         .ndo_open               = vxlan_open,
3220         .ndo_stop               = vxlan_stop,
3221         .ndo_start_xmit         = vxlan_xmit,
3222         .ndo_get_stats64        = ip_tunnel_get_stats64,
3223         .ndo_set_rx_mode        = vxlan_set_multicast_list,
3224         .ndo_change_mtu         = vxlan_change_mtu,
3225         .ndo_validate_addr      = eth_validate_addr,
3226         .ndo_set_mac_address    = eth_mac_addr,
3227         .ndo_fdb_add            = vxlan_fdb_add,
3228         .ndo_fdb_del            = vxlan_fdb_delete,
3229         .ndo_fdb_dump           = vxlan_fdb_dump,
3230         .ndo_fdb_get            = vxlan_fdb_get,
3231         .ndo_fill_metadata_dst  = vxlan_fill_metadata_dst,
3232         .ndo_change_proto_down  = dev_change_proto_down_generic,
3233 };
3234
3235 static const struct net_device_ops vxlan_netdev_raw_ops = {
3236         .ndo_init               = vxlan_init,
3237         .ndo_uninit             = vxlan_uninit,
3238         .ndo_open               = vxlan_open,
3239         .ndo_stop               = vxlan_stop,
3240         .ndo_start_xmit         = vxlan_xmit,
3241         .ndo_get_stats64        = ip_tunnel_get_stats64,
3242         .ndo_change_mtu         = vxlan_change_mtu,
3243         .ndo_fill_metadata_dst  = vxlan_fill_metadata_dst,
3244 };
3245
3246 /* Info for udev, that this is a virtual tunnel endpoint */
3247 static struct device_type vxlan_type = {
3248         .name = "vxlan",
3249 };
3250
3251 /* Calls the ndo_udp_tunnel_add of the caller in order to
3252  * supply the listening VXLAN udp ports. Callers are expected
3253  * to implement the ndo_udp_tunnel_add.
3254  */
3255 static void vxlan_offload_rx_ports(struct net_device *dev, bool push)
3256 {
3257         struct vxlan_sock *vs;
3258         struct net *net = dev_net(dev);
3259         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3260         unsigned int i;
3261
3262         spin_lock(&vn->sock_lock);
3263         for (i = 0; i < PORT_HASH_SIZE; ++i) {
3264                 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
3265                         unsigned short type;
3266
3267                         if (vs->flags & VXLAN_F_GPE)
3268                                 type = UDP_TUNNEL_TYPE_VXLAN_GPE;
3269                         else
3270                                 type = UDP_TUNNEL_TYPE_VXLAN;
3271
3272                         if (push)
3273                                 udp_tunnel_push_rx_port(dev, vs->sock, type);
3274                         else
3275                                 udp_tunnel_drop_rx_port(dev, vs->sock, type);
3276                 }
3277         }
3278         spin_unlock(&vn->sock_lock);
3279 }
3280
3281 /* Initialize the device structure. */
3282 static void vxlan_setup(struct net_device *dev)
3283 {
3284         struct vxlan_dev *vxlan = netdev_priv(dev);
3285         unsigned int h;
3286
3287         eth_hw_addr_random(dev);
3288         ether_setup(dev);
3289
3290         dev->needs_free_netdev = true;
3291         SET_NETDEV_DEVTYPE(dev, &vxlan_type);
3292
3293         dev->features   |= NETIF_F_LLTX;
3294         dev->features   |= NETIF_F_SG | NETIF_F_HW_CSUM;
3295         dev->features   |= NETIF_F_RXCSUM;
3296         dev->features   |= NETIF_F_GSO_SOFTWARE;
3297
3298         dev->vlan_features = dev->features;
3299         dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
3300         dev->hw_features |= NETIF_F_GSO_SOFTWARE;
3301         netif_keep_dst(dev);
3302         dev->priv_flags |= IFF_NO_QUEUE;
3303
3304         /* MTU range: 68 - 65535 */
3305         dev->min_mtu = ETH_MIN_MTU;
3306         dev->max_mtu = ETH_MAX_MTU;
3307
3308         INIT_LIST_HEAD(&vxlan->next);
3309
3310         timer_setup(&vxlan->age_timer, vxlan_cleanup, TIMER_DEFERRABLE);
3311
3312         vxlan->dev = dev;
3313
3314         for (h = 0; h < FDB_HASH_SIZE; ++h) {
3315                 spin_lock_init(&vxlan->hash_lock[h]);
3316                 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
3317         }
3318 }
3319
3320 static void vxlan_ether_setup(struct net_device *dev)
3321 {
3322         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
3323         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
3324         dev->netdev_ops = &vxlan_netdev_ether_ops;
3325 }
3326
3327 static void vxlan_raw_setup(struct net_device *dev)
3328 {
3329         dev->header_ops = NULL;
3330         dev->type = ARPHRD_NONE;
3331         dev->hard_header_len = 0;
3332         dev->addr_len = 0;
3333         dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
3334         dev->netdev_ops = &vxlan_netdev_raw_ops;
3335 }
3336
3337 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
3338         [IFLA_VXLAN_ID]         = { .type = NLA_U32 },
3339         [IFLA_VXLAN_GROUP]      = { .len = sizeof_field(struct iphdr, daddr) },
3340         [IFLA_VXLAN_GROUP6]     = { .len = sizeof(struct in6_addr) },
3341         [IFLA_VXLAN_LINK]       = { .type = NLA_U32 },
3342         [IFLA_VXLAN_LOCAL]      = { .len = sizeof_field(struct iphdr, saddr) },
3343         [IFLA_VXLAN_LOCAL6]     = { .len = sizeof(struct in6_addr) },
3344         [IFLA_VXLAN_TOS]        = { .type = NLA_U8 },
3345         [IFLA_VXLAN_TTL]        = { .type = NLA_U8 },
3346         [IFLA_VXLAN_LABEL]      = { .type = NLA_U32 },
3347         [IFLA_VXLAN_LEARNING]   = { .type = NLA_U8 },
3348         [IFLA_VXLAN_AGEING]     = { .type = NLA_U32 },
3349         [IFLA_VXLAN_LIMIT]      = { .type = NLA_U32 },
3350         [IFLA_VXLAN_PORT_RANGE] = { .len  = sizeof(struct ifla_vxlan_port_range) },
3351         [IFLA_VXLAN_PROXY]      = { .type = NLA_U8 },
3352         [IFLA_VXLAN_RSC]        = { .type = NLA_U8 },
3353         [IFLA_VXLAN_L2MISS]     = { .type = NLA_U8 },
3354         [IFLA_VXLAN_L3MISS]     = { .type = NLA_U8 },
3355         [IFLA_VXLAN_COLLECT_METADATA]   = { .type = NLA_U8 },
3356         [IFLA_VXLAN_PORT]       = { .type = NLA_U16 },
3357         [IFLA_VXLAN_UDP_CSUM]   = { .type = NLA_U8 },
3358         [IFLA_VXLAN_UDP_ZERO_CSUM6_TX]  = { .type = NLA_U8 },
3359         [IFLA_VXLAN_UDP_ZERO_CSUM6_RX]  = { .type = NLA_U8 },
3360         [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 },
3361         [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
3362         [IFLA_VXLAN_GBP]        = { .type = NLA_FLAG, },
3363         [IFLA_VXLAN_GPE]        = { .type = NLA_FLAG, },
3364         [IFLA_VXLAN_REMCSUM_NOPARTIAL]  = { .type = NLA_FLAG },
3365         [IFLA_VXLAN_TTL_INHERIT]        = { .type = NLA_FLAG },
3366         [IFLA_VXLAN_DF]         = { .type = NLA_U8 },
3367 };
3368
3369 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[],
3370                           struct netlink_ext_ack *extack)
3371 {
3372         if (tb[IFLA_ADDRESS]) {
3373                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
3374                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
3375                                             "Provided link layer address is not Ethernet");
3376                         return -EINVAL;
3377                 }
3378
3379                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
3380                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
3381                                             "Provided Ethernet address is not unicast");
3382                         return -EADDRNOTAVAIL;
3383                 }
3384         }
3385
3386         if (tb[IFLA_MTU]) {
3387                 u32 mtu = nla_get_u32(tb[IFLA_MTU]);
3388
3389                 if (mtu < ETH_MIN_MTU || mtu > ETH_MAX_MTU) {
3390                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_MTU],
3391                                             "MTU must be between 68 and 65535");
3392                         return -EINVAL;
3393                 }
3394         }
3395
3396         if (!data) {
3397                 NL_SET_ERR_MSG(extack,
3398                                "Required attributes not provided to perform the operation");
3399                 return -EINVAL;
3400         }
3401
3402         if (data[IFLA_VXLAN_ID]) {
3403                 u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
3404
3405                 if (id >= VXLAN_N_VID) {
3406                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_ID],
3407                                             "VXLAN ID must be lower than 16777216");
3408                         return -ERANGE;
3409                 }
3410         }
3411
3412         if (data[IFLA_VXLAN_PORT_RANGE]) {
3413                 const struct ifla_vxlan_port_range *p
3414                         = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
3415
3416                 if (ntohs(p->high) < ntohs(p->low)) {
3417                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_PORT_RANGE],
3418                                             "Invalid source port range");
3419                         return -EINVAL;
3420                 }
3421         }
3422
3423         if (data[IFLA_VXLAN_DF]) {
3424                 enum ifla_vxlan_df df = nla_get_u8(data[IFLA_VXLAN_DF]);
3425
3426                 if (df < 0 || df > VXLAN_DF_MAX) {
3427                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_DF],
3428                                             "Invalid DF attribute");
3429                         return -EINVAL;
3430                 }
3431         }
3432
3433         return 0;
3434 }
3435
3436 static void vxlan_get_drvinfo(struct net_device *netdev,
3437                               struct ethtool_drvinfo *drvinfo)
3438 {
3439         strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
3440         strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
3441 }
3442
3443 static int vxlan_get_link_ksettings(struct net_device *dev,
3444                                     struct ethtool_link_ksettings *cmd)
3445 {
3446         struct vxlan_dev *vxlan = netdev_priv(dev);
3447         struct vxlan_rdst *dst = &vxlan->default_dst;
3448         struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
3449                                                          dst->remote_ifindex);
3450
3451         if (!lowerdev) {
3452                 cmd->base.duplex = DUPLEX_UNKNOWN;
3453                 cmd->base.port = PORT_OTHER;
3454                 cmd->base.speed = SPEED_UNKNOWN;
3455
3456                 return 0;
3457         }
3458
3459         return __ethtool_get_link_ksettings(lowerdev, cmd);
3460 }
3461
3462 static const struct ethtool_ops vxlan_ethtool_ops = {
3463         .get_drvinfo            = vxlan_get_drvinfo,
3464         .get_link               = ethtool_op_get_link,
3465         .get_link_ksettings     = vxlan_get_link_ksettings,
3466 };
3467
3468 static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
3469                                         __be16 port, u32 flags, int ifindex)
3470 {
3471         struct socket *sock;
3472         struct udp_port_cfg udp_conf;
3473         int err;
3474
3475         memset(&udp_conf, 0, sizeof(udp_conf));
3476
3477         if (ipv6) {
3478                 udp_conf.family = AF_INET6;
3479                 udp_conf.use_udp6_rx_checksums =
3480                     !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
3481                 udp_conf.ipv6_v6only = 1;
3482         } else {
3483                 udp_conf.family = AF_INET;
3484         }
3485
3486         udp_conf.local_udp_port = port;
3487         udp_conf.bind_ifindex = ifindex;
3488
3489         /* Open UDP socket */
3490         err = udp_sock_create(net, &udp_conf, &sock);
3491         if (err < 0)
3492                 return ERR_PTR(err);
3493
3494         return sock;
3495 }
3496
3497 /* Create new listen socket if needed */
3498 static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6,
3499                                               __be16 port, u32 flags,
3500                                               int ifindex)
3501 {
3502         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3503         struct vxlan_sock *vs;
3504         struct socket *sock;
3505         unsigned int h;
3506         struct udp_tunnel_sock_cfg tunnel_cfg;
3507
3508         vs = kzalloc(sizeof(*vs), GFP_KERNEL);
3509         if (!vs)
3510                 return ERR_PTR(-ENOMEM);
3511
3512         for (h = 0; h < VNI_HASH_SIZE; ++h)
3513                 INIT_HLIST_HEAD(&vs->vni_list[h]);
3514
3515         sock = vxlan_create_sock(net, ipv6, port, flags, ifindex);
3516         if (IS_ERR(sock)) {
3517                 kfree(vs);
3518                 return ERR_CAST(sock);
3519         }
3520
3521         vs->sock = sock;
3522         refcount_set(&vs->refcnt, 1);
3523         vs->flags = (flags & VXLAN_F_RCV_FLAGS);
3524
3525         spin_lock(&vn->sock_lock);
3526         hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
3527         udp_tunnel_notify_add_rx_port(sock,
3528                                       (vs->flags & VXLAN_F_GPE) ?
3529                                       UDP_TUNNEL_TYPE_VXLAN_GPE :
3530                                       UDP_TUNNEL_TYPE_VXLAN);
3531         spin_unlock(&vn->sock_lock);
3532
3533         /* Mark socket as an encapsulation socket. */
3534         memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
3535         tunnel_cfg.sk_user_data = vs;
3536         tunnel_cfg.encap_type = 1;
3537         tunnel_cfg.encap_rcv = vxlan_rcv;
3538         tunnel_cfg.encap_err_lookup = vxlan_err_lookup;
3539         tunnel_cfg.encap_destroy = NULL;
3540         tunnel_cfg.gro_receive = vxlan_gro_receive;
3541         tunnel_cfg.gro_complete = vxlan_gro_complete;
3542
3543         setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
3544
3545         return vs;
3546 }
3547
3548 static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6)
3549 {
3550         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
3551         struct vxlan_sock *vs = NULL;
3552         struct vxlan_dev_node *node;
3553         int l3mdev_index = 0;
3554
3555         if (vxlan->cfg.remote_ifindex)
3556                 l3mdev_index = l3mdev_master_upper_ifindex_by_index(
3557                         vxlan->net, vxlan->cfg.remote_ifindex);
3558
3559         if (!vxlan->cfg.no_share) {
3560                 spin_lock(&vn->sock_lock);
3561                 vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
3562                                      vxlan->cfg.dst_port, vxlan->cfg.flags,
3563                                      l3mdev_index);
3564                 if (vs && !refcount_inc_not_zero(&vs->refcnt)) {
3565                         spin_unlock(&vn->sock_lock);
3566                         return -EBUSY;
3567                 }
3568                 spin_unlock(&vn->sock_lock);
3569         }
3570         if (!vs)
3571                 vs = vxlan_socket_create(vxlan->net, ipv6,
3572                                          vxlan->cfg.dst_port, vxlan->cfg.flags,
3573                                          l3mdev_index);
3574         if (IS_ERR(vs))
3575                 return PTR_ERR(vs);
3576 #if IS_ENABLED(CONFIG_IPV6)
3577         if (ipv6) {
3578                 rcu_assign_pointer(vxlan->vn6_sock, vs);
3579                 node = &vxlan->hlist6;
3580         } else
3581 #endif
3582         {
3583                 rcu_assign_pointer(vxlan->vn4_sock, vs);
3584                 node = &vxlan->hlist4;
3585         }
3586         vxlan_vs_add_dev(vs, vxlan, node);
3587         return 0;
3588 }
3589
3590 static int vxlan_sock_add(struct vxlan_dev *vxlan)
3591 {
3592         bool metadata = vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA;
3593         bool ipv6 = vxlan->cfg.flags & VXLAN_F_IPV6 || metadata;
3594         bool ipv4 = !ipv6 || metadata;
3595         int ret = 0;
3596
3597         RCU_INIT_POINTER(vxlan->vn4_sock, NULL);
3598 #if IS_ENABLED(CONFIG_IPV6)
3599         RCU_INIT_POINTER(vxlan->vn6_sock, NULL);
3600         if (ipv6) {
3601                 ret = __vxlan_sock_add(vxlan, true);
3602                 if (ret < 0 && ret != -EAFNOSUPPORT)
3603                         ipv4 = false;
3604         }
3605 #endif
3606         if (ipv4)
3607                 ret = __vxlan_sock_add(vxlan, false);
3608         if (ret < 0)
3609                 vxlan_sock_release(vxlan);
3610         return ret;
3611 }
3612
3613 static int vxlan_config_validate(struct net *src_net, struct vxlan_config *conf,
3614                                  struct net_device **lower,
3615                                  struct vxlan_dev *old,
3616                                  struct netlink_ext_ack *extack)
3617 {
3618         struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
3619         struct vxlan_dev *tmp;
3620         bool use_ipv6 = false;
3621
3622         if (conf->flags & VXLAN_F_GPE) {
3623                 /* For now, allow GPE only together with
3624                  * COLLECT_METADATA. This can be relaxed later; in such
3625                  * case, the other side of the PtP link will have to be
3626                  * provided.
3627                  */
3628                 if ((conf->flags & ~VXLAN_F_ALLOWED_GPE) ||
3629                     !(conf->flags & VXLAN_F_COLLECT_METADATA)) {
3630                         NL_SET_ERR_MSG(extack,
3631                                        "VXLAN GPE does not support this combination of attributes");
3632                         return -EINVAL;
3633                 }
3634         }
3635
3636         if (!conf->remote_ip.sa.sa_family && !conf->saddr.sa.sa_family) {
3637                 /* Unless IPv6 is explicitly requested, assume IPv4 */
3638                 conf->remote_ip.sa.sa_family = AF_INET;
3639                 conf->saddr.sa.sa_family = AF_INET;
3640         } else if (!conf->remote_ip.sa.sa_family) {
3641                 conf->remote_ip.sa.sa_family = conf->saddr.sa.sa_family;
3642         } else if (!conf->saddr.sa.sa_family) {
3643                 conf->saddr.sa.sa_family = conf->remote_ip.sa.sa_family;
3644         }
3645
3646         if (conf->saddr.sa.sa_family != conf->remote_ip.sa.sa_family) {
3647                 NL_SET_ERR_MSG(extack,
3648                                "Local and remote address must be from the same family");
3649                 return -EINVAL;
3650         }
3651
3652         if (vxlan_addr_multicast(&conf->saddr)) {
3653                 NL_SET_ERR_MSG(extack, "Local address cannot be multicast");
3654                 return -EINVAL;
3655         }
3656
3657         if (conf->saddr.sa.sa_family == AF_INET6) {
3658                 if (!IS_ENABLED(CONFIG_IPV6)) {
3659                         NL_SET_ERR_MSG(extack,
3660                                        "IPv6 support not enabled in the kernel");
3661                         return -EPFNOSUPPORT;
3662                 }
3663                 use_ipv6 = true;
3664                 conf->flags |= VXLAN_F_IPV6;
3665
3666                 if (!(conf->flags & VXLAN_F_COLLECT_METADATA)) {
3667                         int local_type =
3668                                 ipv6_addr_type(&conf->saddr.sin6.sin6_addr);
3669                         int remote_type =
3670                                 ipv6_addr_type(&conf->remote_ip.sin6.sin6_addr);
3671
3672                         if (local_type & IPV6_ADDR_LINKLOCAL) {
3673                                 if (!(remote_type & IPV6_ADDR_LINKLOCAL) &&
3674                                     (remote_type != IPV6_ADDR_ANY)) {
3675                                         NL_SET_ERR_MSG(extack,
3676                                                        "Invalid combination of local and remote address scopes");
3677                                         return -EINVAL;
3678                                 }
3679
3680                                 conf->flags |= VXLAN_F_IPV6_LINKLOCAL;
3681                         } else {
3682                                 if (remote_type ==
3683                                     (IPV6_ADDR_UNICAST | IPV6_ADDR_LINKLOCAL)) {
3684                                         NL_SET_ERR_MSG(extack,
3685                                                        "Invalid combination of local and remote address scopes");
3686                                         return -EINVAL;
3687                                 }
3688
3689                                 conf->flags &= ~VXLAN_F_IPV6_LINKLOCAL;
3690                         }
3691                 }
3692         }
3693
3694         if (conf->label && !use_ipv6) {
3695                 NL_SET_ERR_MSG(extack,
3696                                "Label attribute only applies to IPv6 VXLAN devices");
3697                 return -EINVAL;
3698         }
3699
3700         if (conf->remote_ifindex) {
3701                 struct net_device *lowerdev;
3702
3703                 lowerdev = __dev_get_by_index(src_net, conf->remote_ifindex);
3704                 if (!lowerdev) {
3705                         NL_SET_ERR_MSG(extack,
3706                                        "Invalid local interface, device not found");
3707                         return -ENODEV;
3708                 }
3709
3710 #if IS_ENABLED(CONFIG_IPV6)
3711                 if (use_ipv6) {
3712                         struct inet6_dev *idev = __in6_dev_get(lowerdev);
3713                         if (idev && idev->cnf.disable_ipv6) {
3714                                 NL_SET_ERR_MSG(extack,
3715                                                "IPv6 support disabled by administrator");
3716                                 return -EPERM;
3717                         }
3718                 }
3719 #endif
3720
3721                 *lower = lowerdev;
3722         } else {
3723                 if (vxlan_addr_multicast(&conf->remote_ip)) {
3724                         NL_SET_ERR_MSG(extack,
3725                                        "Local interface required for multicast remote destination");
3726
3727                         return -EINVAL;
3728                 }
3729
3730 #if IS_ENABLED(CONFIG_IPV6)
3731                 if (conf->flags & VXLAN_F_IPV6_LINKLOCAL) {
3732                         NL_SET_ERR_MSG(extack,
3733                                        "Local interface required for link-local local/remote addresses");
3734                         return -EINVAL;
3735                 }
3736 #endif
3737
3738                 *lower = NULL;
3739         }
3740
3741         if (!conf->dst_port) {
3742                 if (conf->flags & VXLAN_F_GPE)
3743                         conf->dst_port = htons(4790); /* IANA VXLAN-GPE port */
3744                 else
3745                         conf->dst_port = htons(vxlan_port);
3746         }
3747
3748         if (!conf->age_interval)
3749                 conf->age_interval = FDB_AGE_DEFAULT;
3750
3751         list_for_each_entry(tmp, &vn->vxlan_list, next) {
3752                 if (tmp == old)
3753                         continue;
3754
3755                 if (tmp->cfg.vni != conf->vni)
3756                         continue;
3757                 if (tmp->cfg.dst_port != conf->dst_port)
3758                         continue;
3759                 if ((tmp->cfg.flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)) !=
3760                     (conf->flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)))
3761                         continue;
3762
3763                 if ((conf->flags & VXLAN_F_IPV6_LINKLOCAL) &&
3764                     tmp->cfg.remote_ifindex != conf->remote_ifindex)
3765                         continue;
3766
3767                 NL_SET_ERR_MSG(extack,
3768                                "A VXLAN device with the specified VNI already exists");
3769                 return -EEXIST;
3770         }
3771
3772         return 0;
3773 }
3774
3775 static void vxlan_config_apply(struct net_device *dev,
3776                                struct vxlan_config *conf,
3777                                struct net_device *lowerdev,
3778                                struct net *src_net,
3779                                bool changelink)
3780 {
3781         struct vxlan_dev *vxlan = netdev_priv(dev);
3782         struct vxlan_rdst *dst = &vxlan->default_dst;
3783         unsigned short needed_headroom = ETH_HLEN;
3784         int max_mtu = ETH_MAX_MTU;
3785         u32 flags = conf->flags;
3786
3787         if (!changelink) {
3788                 if (flags & VXLAN_F_GPE)
3789                         vxlan_raw_setup(dev);
3790                 else
3791                         vxlan_ether_setup(dev);
3792
3793                 if (conf->mtu)
3794                         dev->mtu = conf->mtu;
3795
3796                 vxlan->net = src_net;
3797         }
3798
3799         dst->remote_vni = conf->vni;
3800
3801         memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip));
3802
3803         if (lowerdev) {
3804                 dst->remote_ifindex = conf->remote_ifindex;
3805
3806                 dev->gso_max_size = lowerdev->gso_max_size;
3807                 dev->gso_max_segs = lowerdev->gso_max_segs;
3808
3809                 needed_headroom = lowerdev->hard_header_len;
3810                 needed_headroom += lowerdev->needed_headroom;
3811
3812                 dev->needed_tailroom = lowerdev->needed_tailroom;
3813
3814                 max_mtu = lowerdev->mtu - vxlan_headroom(flags);
3815                 if (max_mtu < ETH_MIN_MTU)
3816                         max_mtu = ETH_MIN_MTU;
3817
3818                 if (!changelink && !conf->mtu)
3819                         dev->mtu = max_mtu;
3820         }
3821
3822         if (dev->mtu > max_mtu)
3823                 dev->mtu = max_mtu;
3824
3825         if (flags & VXLAN_F_COLLECT_METADATA)
3826                 flags |= VXLAN_F_IPV6;
3827         needed_headroom += vxlan_headroom(flags);
3828         dev->needed_headroom = needed_headroom;
3829
3830         memcpy(&vxlan->cfg, conf, sizeof(*conf));
3831 }
3832
3833 static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
3834                                struct vxlan_config *conf, bool changelink,
3835                                struct netlink_ext_ack *extack)
3836 {
3837         struct vxlan_dev *vxlan = netdev_priv(dev);
3838         struct net_device *lowerdev;
3839         int ret;
3840
3841         ret = vxlan_config_validate(src_net, conf, &lowerdev, vxlan, extack);
3842         if (ret)
3843                 return ret;
3844
3845         vxlan_config_apply(dev, conf, lowerdev, src_net, changelink);
3846
3847         return 0;
3848 }
3849
3850 static int __vxlan_dev_create(struct net *net, struct net_device *dev,
3851                               struct vxlan_config *conf,
3852                               struct netlink_ext_ack *extack)
3853 {
3854         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3855         struct vxlan_dev *vxlan = netdev_priv(dev);
3856         struct net_device *remote_dev = NULL;
3857         struct vxlan_fdb *f = NULL;
3858         bool unregister = false;
3859         struct vxlan_rdst *dst;
3860         int err;
3861
3862         dst = &vxlan->default_dst;
3863         err = vxlan_dev_configure(net, dev, conf, false, extack);
3864         if (err)
3865                 return err;
3866
3867         dev->ethtool_ops = &vxlan_ethtool_ops;
3868
3869         /* create an fdb entry for a valid default destination */
3870         if (!vxlan_addr_any(&dst->remote_ip)) {
3871                 err = vxlan_fdb_create(vxlan, all_zeros_mac,
3872                                        &dst->remote_ip,
3873                                        NUD_REACHABLE | NUD_PERMANENT,
3874                                        vxlan->cfg.dst_port,
3875                                        dst->remote_vni,
3876                                        dst->remote_vni,
3877                                        dst->remote_ifindex,
3878                                        NTF_SELF, 0, &f, extack);
3879                 if (err)
3880                         return err;
3881         }
3882
3883         err = register_netdevice(dev);
3884         if (err)
3885                 goto errout;
3886         unregister = true;
3887
3888         if (dst->remote_ifindex) {
3889                 remote_dev = __dev_get_by_index(net, dst->remote_ifindex);
3890                 if (!remote_dev) {
3891                         err = -ENODEV;
3892                         goto errout;
3893                 }
3894
3895                 err = netdev_upper_dev_link(remote_dev, dev, extack);
3896                 if (err)
3897                         goto errout;
3898         }
3899
3900         err = rtnl_configure_link(dev, NULL);
3901         if (err < 0)
3902                 goto unlink;
3903
3904         if (f) {
3905                 vxlan_fdb_insert(vxlan, all_zeros_mac, dst->remote_vni, f);
3906
3907                 /* notify default fdb entry */
3908                 err = vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f),
3909                                        RTM_NEWNEIGH, true, extack);
3910                 if (err) {
3911                         vxlan_fdb_destroy(vxlan, f, false, false);
3912                         if (remote_dev)
3913                                 netdev_upper_dev_unlink(remote_dev, dev);
3914                         goto unregister;
3915                 }
3916         }
3917
3918         list_add(&vxlan->next, &vn->vxlan_list);
3919         if (remote_dev)
3920                 dst->remote_dev = remote_dev;
3921         return 0;
3922 unlink:
3923         if (remote_dev)
3924                 netdev_upper_dev_unlink(remote_dev, dev);
3925 errout:
3926         /* unregister_netdevice() destroys the default FDB entry with deletion
3927          * notification. But the addition notification was not sent yet, so
3928          * destroy the entry by hand here.
3929          */
3930         if (f)
3931                 __vxlan_fdb_free(f);
3932 unregister:
3933         if (unregister)
3934                 unregister_netdevice(dev);
3935         return err;
3936 }
3937
3938 /* Set/clear flags based on attribute */
3939 static int vxlan_nl2flag(struct vxlan_config *conf, struct nlattr *tb[],
3940                           int attrtype, unsigned long mask, bool changelink,
3941                           bool changelink_supported,
3942                           struct netlink_ext_ack *extack)
3943 {
3944         unsigned long flags;
3945
3946         if (!tb[attrtype])
3947                 return 0;
3948
3949         if (changelink && !changelink_supported) {
3950                 vxlan_flag_attr_error(attrtype, extack);
3951                 return -EOPNOTSUPP;
3952         }
3953
3954         if (vxlan_policy[attrtype].type == NLA_FLAG)
3955                 flags = conf->flags | mask;
3956         else if (nla_get_u8(tb[attrtype]))
3957                 flags = conf->flags | mask;
3958         else
3959                 flags = conf->flags & ~mask;
3960
3961         conf->flags = flags;
3962
3963         return 0;
3964 }
3965
3966 static int vxlan_nl2conf(struct nlattr *tb[], struct nlattr *data[],
3967                          struct net_device *dev, struct vxlan_config *conf,
3968                          bool changelink, struct netlink_ext_ack *extack)
3969 {
3970         struct vxlan_dev *vxlan = netdev_priv(dev);
3971         int err = 0;
3972
3973         memset(conf, 0, sizeof(*conf));
3974
3975         /* if changelink operation, start with old existing cfg */
3976         if (changelink)
3977                 memcpy(conf, &vxlan->cfg, sizeof(*conf));
3978
3979         if (data[IFLA_VXLAN_ID]) {
3980                 __be32 vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
3981
3982                 if (changelink && (vni != conf->vni)) {
3983                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_ID], "Cannot change VNI");
3984                         return -EOPNOTSUPP;
3985                 }
3986                 conf->vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
3987         }
3988
3989         if (data[IFLA_VXLAN_GROUP]) {
3990                 if (changelink && (conf->remote_ip.sa.sa_family != AF_INET)) {
3991                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP], "New group address family does not match old group");
3992                         return -EOPNOTSUPP;
3993                 }
3994
3995                 conf->remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
3996                 conf->remote_ip.sa.sa_family = AF_INET;
3997         } else if (data[IFLA_VXLAN_GROUP6]) {
3998                 if (!IS_ENABLED(CONFIG_IPV6)) {
3999                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP6], "IPv6 support not enabled in the kernel");
4000                         return -EPFNOSUPPORT;
4001                 }
4002
4003                 if (changelink && (conf->remote_ip.sa.sa_family != AF_INET6)) {
4004                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP6], "New group address family does not match old group");
4005                         return -EOPNOTSUPP;
4006                 }
4007
4008                 conf->remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]);
4009                 conf->remote_ip.sa.sa_family = AF_INET6;
4010         }
4011
4012         if (data[IFLA_VXLAN_LOCAL]) {
4013                 if (changelink && (conf->saddr.sa.sa_family != AF_INET)) {
4014                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL], "New local address family does not match old");
4015                         return -EOPNOTSUPP;
4016                 }
4017
4018                 conf->saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]);
4019                 conf->saddr.sa.sa_family = AF_INET;
4020         } else if (data[IFLA_VXLAN_LOCAL6]) {
4021                 if (!IS_ENABLED(CONFIG_IPV6)) {
4022                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL6], "IPv6 support not enabled in the kernel");
4023                         return -EPFNOSUPPORT;
4024                 }
4025
4026                 if (changelink && (conf->saddr.sa.sa_family != AF_INET6)) {
4027                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL6], "New local address family does not match old");
4028                         return -EOPNOTSUPP;
4029                 }
4030
4031                 /* TODO: respect scope id */
4032                 conf->saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
4033                 conf->saddr.sa.sa_family = AF_INET6;
4034         }
4035
4036         if (data[IFLA_VXLAN_LINK])
4037                 conf->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]);
4038
4039         if (data[IFLA_VXLAN_TOS])
4040                 conf->tos  = nla_get_u8(data[IFLA_VXLAN_TOS]);
4041
4042         if (data[IFLA_VXLAN_TTL])
4043                 conf->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
4044
4045         if (data[IFLA_VXLAN_TTL_INHERIT]) {
4046                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_TTL_INHERIT,
4047                                     VXLAN_F_TTL_INHERIT, changelink, false,
4048                                     extack);
4049                 if (err)
4050                         return err;
4051
4052         }
4053
4054         if (data[IFLA_VXLAN_LABEL])
4055                 conf->label = nla_get_be32(data[IFLA_VXLAN_LABEL]) &
4056                              IPV6_FLOWLABEL_MASK;
4057
4058         if (data[IFLA_VXLAN_LEARNING]) {
4059                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_LEARNING,
4060                                     VXLAN_F_LEARN, changelink, true,
4061                                     extack);
4062                 if (err)
4063                         return err;
4064         } else if (!changelink) {
4065                 /* default to learn on a new device */
4066                 conf->flags |= VXLAN_F_LEARN;
4067         }
4068
4069         if (data[IFLA_VXLAN_AGEING])
4070                 conf->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
4071
4072         if (data[IFLA_VXLAN_PROXY]) {
4073                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_PROXY,
4074                                     VXLAN_F_PROXY, changelink, false,
4075                                     extack);
4076                 if (err)
4077                         return err;
4078         }
4079
4080         if (data[IFLA_VXLAN_RSC]) {
4081                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_RSC,
4082                                     VXLAN_F_RSC, changelink, false,
4083                                     extack);
4084                 if (err)
4085                         return err;
4086         }
4087
4088         if (data[IFLA_VXLAN_L2MISS]) {
4089                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_L2MISS,
4090                                     VXLAN_F_L2MISS, changelink, false,
4091                                     extack);
4092                 if (err)
4093                         return err;
4094         }
4095
4096         if (data[IFLA_VXLAN_L3MISS]) {
4097                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_L3MISS,
4098                                     VXLAN_F_L3MISS, changelink, false,
4099                                     extack);
4100                 if (err)
4101                         return err;
4102         }
4103
4104         if (data[IFLA_VXLAN_LIMIT]) {
4105                 if (changelink) {
4106                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LIMIT],
4107                                             "Cannot change limit");
4108                         return -EOPNOTSUPP;
4109                 }
4110                 conf->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
4111         }
4112
4113         if (data[IFLA_VXLAN_COLLECT_METADATA]) {
4114                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_COLLECT_METADATA,
4115                                     VXLAN_F_COLLECT_METADATA, changelink, false,
4116                                     extack);
4117                 if (err)
4118                         return err;
4119         }
4120
4121         if (data[IFLA_VXLAN_PORT_RANGE]) {
4122                 if (!changelink) {
4123                         const struct ifla_vxlan_port_range *p
4124                                 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
4125                         conf->port_min = ntohs(p->low);
4126                         conf->port_max = ntohs(p->high);
4127                 } else {
4128                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT_RANGE],
4129                                             "Cannot change port range");
4130                         return -EOPNOTSUPP;
4131                 }
4132         }
4133
4134         if (data[IFLA_VXLAN_PORT]) {
4135                 if (changelink) {
4136                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT],
4137                                             "Cannot change port");
4138                         return -EOPNOTSUPP;
4139                 }
4140                 conf->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
4141         }
4142
4143         if (data[IFLA_VXLAN_UDP_CSUM]) {
4144                 if (changelink) {
4145                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_UDP_CSUM],
4146                                             "Cannot change UDP_CSUM flag");
4147                         return -EOPNOTSUPP;
4148                 }
4149                 if (!nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
4150                         conf->flags |= VXLAN_F_UDP_ZERO_CSUM_TX;
4151         }
4152
4153         if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]) {
4154                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
4155                                     VXLAN_F_UDP_ZERO_CSUM6_TX, changelink,
4156                                     false, extack);
4157                 if (err)
4158                         return err;
4159         }
4160
4161         if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]) {
4162                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
4163                                     VXLAN_F_UDP_ZERO_CSUM6_RX, changelink,
4164                                     false, extack);
4165                 if (err)
4166                         return err;
4167         }
4168
4169         if (data[IFLA_VXLAN_REMCSUM_TX]) {
4170                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_TX,
4171                                     VXLAN_F_REMCSUM_TX, changelink, false,
4172                                     extack);
4173                 if (err)
4174                         return err;
4175         }
4176
4177         if (data[IFLA_VXLAN_REMCSUM_RX]) {
4178                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_RX,
4179                                     VXLAN_F_REMCSUM_RX, changelink, false,
4180                                     extack);
4181                 if (err)
4182                         return err;
4183         }
4184
4185         if (data[IFLA_VXLAN_GBP]) {
4186                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_GBP,
4187                                     VXLAN_F_GBP, changelink, false, extack);
4188                 if (err)
4189                         return err;
4190         }
4191
4192         if (data[IFLA_VXLAN_GPE]) {
4193                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_GPE,
4194                                     VXLAN_F_GPE, changelink, false,
4195                                     extack);
4196                 if (err)
4197                         return err;
4198         }
4199
4200         if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL]) {
4201                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_NOPARTIAL,
4202                                     VXLAN_F_REMCSUM_NOPARTIAL, changelink,
4203                                     false, extack);
4204                 if (err)
4205                         return err;
4206         }
4207
4208         if (tb[IFLA_MTU]) {
4209                 if (changelink) {
4210                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_MTU],
4211                                             "Cannot change mtu");
4212                         return -EOPNOTSUPP;
4213                 }
4214                 conf->mtu = nla_get_u32(tb[IFLA_MTU]);
4215         }
4216
4217         if (data[IFLA_VXLAN_DF])
4218                 conf->df = nla_get_u8(data[IFLA_VXLAN_DF]);
4219
4220         return 0;
4221 }
4222
4223 static int vxlan_newlink(struct net *src_net, struct net_device *dev,
4224                          struct nlattr *tb[], struct nlattr *data[],
4225                          struct netlink_ext_ack *extack)
4226 {
4227         struct vxlan_config conf;
4228         int err;
4229
4230         err = vxlan_nl2conf(tb, data, dev, &conf, false, extack);
4231         if (err)
4232                 return err;
4233
4234         return __vxlan_dev_create(src_net, dev, &conf, extack);
4235 }
4236
4237 static int vxlan_changelink(struct net_device *dev, struct nlattr *tb[],
4238                             struct nlattr *data[],
4239                             struct netlink_ext_ack *extack)
4240 {
4241         struct vxlan_dev *vxlan = netdev_priv(dev);
4242         struct net_device *lowerdev;
4243         struct vxlan_config conf;
4244         struct vxlan_rdst *dst;
4245         int err;
4246
4247         dst = &vxlan->default_dst;
4248         err = vxlan_nl2conf(tb, data, dev, &conf, true, extack);
4249         if (err)
4250                 return err;
4251
4252         err = vxlan_config_validate(vxlan->net, &conf, &lowerdev,
4253                                     vxlan, extack);
4254         if (err)
4255                 return err;
4256
4257         if (dst->remote_dev == lowerdev)
4258                 lowerdev = NULL;
4259
4260         err = netdev_adjacent_change_prepare(dst->remote_dev, lowerdev, dev,
4261                                              extack);
4262         if (err)
4263                 return err;
4264
4265         /* handle default dst entry */
4266         if (!vxlan_addr_equal(&conf.remote_ip, &dst->remote_ip)) {
4267                 u32 hash_index = fdb_head_index(vxlan, all_zeros_mac, conf.vni);
4268
4269                 spin_lock_bh(&vxlan->hash_lock[hash_index]);
4270                 if (!vxlan_addr_any(&conf.remote_ip)) {
4271                         err = vxlan_fdb_update(vxlan, all_zeros_mac,
4272                                                &conf.remote_ip,
4273                                                NUD_REACHABLE | NUD_PERMANENT,
4274                                                NLM_F_APPEND | NLM_F_CREATE,
4275                                                vxlan->cfg.dst_port,
4276                                                conf.vni, conf.vni,
4277                                                conf.remote_ifindex,
4278                                                NTF_SELF, 0, true, extack);
4279                         if (err) {
4280                                 spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4281                                 netdev_adjacent_change_abort(dst->remote_dev,
4282                                                              lowerdev, dev);
4283                                 return err;
4284                         }
4285                 }
4286                 if (!vxlan_addr_any(&dst->remote_ip))
4287                         __vxlan_fdb_delete(vxlan, all_zeros_mac,
4288                                            dst->remote_ip,
4289                                            vxlan->cfg.dst_port,
4290                                            dst->remote_vni,
4291                                            dst->remote_vni,
4292                                            dst->remote_ifindex,
4293                                            true);
4294                 spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4295         }
4296
4297         if (conf.age_interval != vxlan->cfg.age_interval)
4298                 mod_timer(&vxlan->age_timer, jiffies);
4299
4300         netdev_adjacent_change_commit(dst->remote_dev, lowerdev, dev);
4301         if (lowerdev && lowerdev != dst->remote_dev)
4302                 dst->remote_dev = lowerdev;
4303         vxlan_config_apply(dev, &conf, lowerdev, vxlan->net, true);
4304         return 0;
4305 }
4306
4307 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
4308 {
4309         struct vxlan_dev *vxlan = netdev_priv(dev);
4310
4311         vxlan_flush(vxlan, true);
4312
4313         list_del(&vxlan->next);
4314         unregister_netdevice_queue(dev, head);
4315         if (vxlan->default_dst.remote_dev)
4316                 netdev_upper_dev_unlink(vxlan->default_dst.remote_dev, dev);
4317 }
4318
4319 static size_t vxlan_get_size(const struct net_device *dev)
4320 {
4321
4322         return nla_total_size(sizeof(__u32)) +  /* IFLA_VXLAN_ID */
4323                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
4324                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
4325                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
4326                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TTL */
4327                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TTL_INHERIT */
4328                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TOS */
4329                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_DF */
4330                 nla_total_size(sizeof(__be32)) + /* IFLA_VXLAN_LABEL */
4331                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_LEARNING */
4332                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_PROXY */
4333                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_RSC */
4334                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_L2MISS */
4335                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_L3MISS */
4336                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_COLLECT_METADATA */
4337                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
4338                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
4339                 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
4340                 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
4341                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
4342                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
4343                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
4344                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
4345                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
4346                 0;
4347 }
4348
4349 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
4350 {
4351         const struct vxlan_dev *vxlan = netdev_priv(dev);
4352         const struct vxlan_rdst *dst = &vxlan->default_dst;
4353         struct ifla_vxlan_port_range ports = {
4354                 .low =  htons(vxlan->cfg.port_min),
4355                 .high = htons(vxlan->cfg.port_max),
4356         };
4357
4358         if (nla_put_u32(skb, IFLA_VXLAN_ID, be32_to_cpu(dst->remote_vni)))
4359                 goto nla_put_failure;
4360
4361         if (!vxlan_addr_any(&dst->remote_ip)) {
4362                 if (dst->remote_ip.sa.sa_family == AF_INET) {
4363                         if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP,
4364                                             dst->remote_ip.sin.sin_addr.s_addr))
4365                                 goto nla_put_failure;
4366 #if IS_ENABLED(CONFIG_IPV6)
4367                 } else {
4368                         if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6,
4369                                              &dst->remote_ip.sin6.sin6_addr))
4370                                 goto nla_put_failure;
4371 #endif
4372                 }
4373         }
4374
4375         if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
4376                 goto nla_put_failure;
4377
4378         if (!vxlan_addr_any(&vxlan->cfg.saddr)) {
4379                 if (vxlan->cfg.saddr.sa.sa_family == AF_INET) {
4380                         if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL,
4381                                             vxlan->cfg.saddr.sin.sin_addr.s_addr))
4382                                 goto nla_put_failure;
4383 #if IS_ENABLED(CONFIG_IPV6)
4384                 } else {
4385                         if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6,
4386                                              &vxlan->cfg.saddr.sin6.sin6_addr))
4387                                 goto nla_put_failure;
4388 #endif
4389                 }
4390         }
4391
4392         if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) ||
4393             nla_put_u8(skb, IFLA_VXLAN_TTL_INHERIT,
4394                        !!(vxlan->cfg.flags & VXLAN_F_TTL_INHERIT)) ||
4395             nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) ||
4396             nla_put_u8(skb, IFLA_VXLAN_DF, vxlan->cfg.df) ||
4397             nla_put_be32(skb, IFLA_VXLAN_LABEL, vxlan->cfg.label) ||
4398             nla_put_u8(skb, IFLA_VXLAN_LEARNING,
4399                        !!(vxlan->cfg.flags & VXLAN_F_LEARN)) ||
4400             nla_put_u8(skb, IFLA_VXLAN_PROXY,
4401                        !!(vxlan->cfg.flags & VXLAN_F_PROXY)) ||
4402             nla_put_u8(skb, IFLA_VXLAN_RSC,
4403                        !!(vxlan->cfg.flags & VXLAN_F_RSC)) ||
4404             nla_put_u8(skb, IFLA_VXLAN_L2MISS,
4405                        !!(vxlan->cfg.flags & VXLAN_F_L2MISS)) ||
4406             nla_put_u8(skb, IFLA_VXLAN_L3MISS,
4407                        !!(vxlan->cfg.flags & VXLAN_F_L3MISS)) ||
4408             nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA,
4409                        !!(vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)) ||
4410             nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) ||
4411             nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) ||
4412             nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) ||
4413             nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
4414                        !(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM_TX)) ||
4415             nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
4416                        !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
4417             nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
4418                        !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
4419             nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
4420                        !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_TX)) ||
4421             nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
4422                        !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_RX)))
4423                 goto nla_put_failure;
4424
4425         if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
4426                 goto nla_put_failure;
4427
4428         if (vxlan->cfg.flags & VXLAN_F_GBP &&
4429             nla_put_flag(skb, IFLA_VXLAN_GBP))
4430                 goto nla_put_failure;
4431
4432         if (vxlan->cfg.flags & VXLAN_F_GPE &&
4433             nla_put_flag(skb, IFLA_VXLAN_GPE))
4434                 goto nla_put_failure;
4435
4436         if (vxlan->cfg.flags & VXLAN_F_REMCSUM_NOPARTIAL &&
4437             nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
4438                 goto nla_put_failure;
4439
4440         return 0;
4441
4442 nla_put_failure:
4443         return -EMSGSIZE;
4444 }
4445
4446 static struct net *vxlan_get_link_net(const struct net_device *dev)
4447 {
4448         struct vxlan_dev *vxlan = netdev_priv(dev);
4449
4450         return vxlan->net;
4451 }
4452
4453 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
4454         .kind           = "vxlan",
4455         .maxtype        = IFLA_VXLAN_MAX,
4456         .policy         = vxlan_policy,
4457         .priv_size      = sizeof(struct vxlan_dev),
4458         .setup          = vxlan_setup,
4459         .validate       = vxlan_validate,
4460         .newlink        = vxlan_newlink,
4461         .changelink     = vxlan_changelink,
4462         .dellink        = vxlan_dellink,
4463         .get_size       = vxlan_get_size,
4464         .fill_info      = vxlan_fill_info,
4465         .get_link_net   = vxlan_get_link_net,
4466 };
4467
4468 struct net_device *vxlan_dev_create(struct net *net, const char *name,
4469                                     u8 name_assign_type,
4470                                     struct vxlan_config *conf)
4471 {
4472         struct nlattr *tb[IFLA_MAX + 1];
4473         struct net_device *dev;
4474         int err;
4475
4476         memset(&tb, 0, sizeof(tb));
4477
4478         dev = rtnl_create_link(net, name, name_assign_type,
4479                                &vxlan_link_ops, tb, NULL);
4480         if (IS_ERR(dev))
4481                 return dev;
4482
4483         err = __vxlan_dev_create(net, dev, conf, NULL);
4484         if (err < 0) {
4485                 free_netdev(dev);
4486                 return ERR_PTR(err);
4487         }
4488
4489         err = rtnl_configure_link(dev, NULL);
4490         if (err < 0) {
4491                 LIST_HEAD(list_kill);
4492
4493                 vxlan_dellink(dev, &list_kill);
4494                 unregister_netdevice_many(&list_kill);
4495                 return ERR_PTR(err);
4496         }
4497
4498         return dev;
4499 }
4500 EXPORT_SYMBOL_GPL(vxlan_dev_create);
4501
4502 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
4503                                              struct net_device *dev)
4504 {
4505         struct vxlan_dev *vxlan, *next;
4506         LIST_HEAD(list_kill);
4507
4508         list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
4509                 struct vxlan_rdst *dst = &vxlan->default_dst;
4510
4511                 /* In case we created vxlan device with carrier
4512                  * and we loose the carrier due to module unload
4513                  * we also need to remove vxlan device. In other
4514                  * cases, it's not necessary and remote_ifindex
4515                  * is 0 here, so no matches.
4516                  */
4517                 if (dst->remote_ifindex == dev->ifindex)
4518                         vxlan_dellink(vxlan->dev, &list_kill);
4519         }
4520
4521         unregister_netdevice_many(&list_kill);
4522 }
4523
4524 static int vxlan_netdevice_event(struct notifier_block *unused,
4525                                  unsigned long event, void *ptr)
4526 {
4527         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
4528         struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
4529
4530         if (event == NETDEV_UNREGISTER) {
4531                 if (!dev->udp_tunnel_nic_info)
4532                         vxlan_offload_rx_ports(dev, false);
4533                 vxlan_handle_lowerdev_unregister(vn, dev);
4534         } else if (event == NETDEV_REGISTER) {
4535                 if (!dev->udp_tunnel_nic_info)
4536                         vxlan_offload_rx_ports(dev, true);
4537         } else if (event == NETDEV_UDP_TUNNEL_PUSH_INFO ||
4538                    event == NETDEV_UDP_TUNNEL_DROP_INFO) {
4539                 vxlan_offload_rx_ports(dev, event == NETDEV_UDP_TUNNEL_PUSH_INFO);
4540         }
4541
4542         return NOTIFY_DONE;
4543 }
4544
4545 static struct notifier_block vxlan_notifier_block __read_mostly = {
4546         .notifier_call = vxlan_netdevice_event,
4547 };
4548
4549 static void
4550 vxlan_fdb_offloaded_set(struct net_device *dev,
4551                         struct switchdev_notifier_vxlan_fdb_info *fdb_info)
4552 {
4553         struct vxlan_dev *vxlan = netdev_priv(dev);
4554         struct vxlan_rdst *rdst;
4555         struct vxlan_fdb *f;
4556         u32 hash_index;
4557
4558         hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni);
4559
4560         spin_lock_bh(&vxlan->hash_lock[hash_index]);
4561
4562         f = vxlan_find_mac(vxlan, fdb_info->eth_addr, fdb_info->vni);
4563         if (!f)
4564                 goto out;
4565
4566         rdst = vxlan_fdb_find_rdst(f, &fdb_info->remote_ip,
4567                                    fdb_info->remote_port,
4568                                    fdb_info->remote_vni,
4569                                    fdb_info->remote_ifindex);
4570         if (!rdst)
4571                 goto out;
4572
4573         rdst->offloaded = fdb_info->offloaded;
4574
4575 out:
4576         spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4577 }
4578
4579 static int
4580 vxlan_fdb_external_learn_add(struct net_device *dev,
4581                              struct switchdev_notifier_vxlan_fdb_info *fdb_info)
4582 {
4583         struct vxlan_dev *vxlan = netdev_priv(dev);
4584         struct netlink_ext_ack *extack;
4585         u32 hash_index;
4586         int err;
4587
4588         hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni);
4589         extack = switchdev_notifier_info_to_extack(&fdb_info->info);
4590
4591         spin_lock_bh(&vxlan->hash_lock[hash_index]);
4592         err = vxlan_fdb_update(vxlan, fdb_info->eth_addr, &fdb_info->remote_ip,
4593                                NUD_REACHABLE,
4594                                NLM_F_CREATE | NLM_F_REPLACE,
4595                                fdb_info->remote_port,
4596                                fdb_info->vni,
4597                                fdb_info->remote_vni,
4598                                fdb_info->remote_ifindex,
4599                                NTF_USE | NTF_SELF | NTF_EXT_LEARNED,
4600                                0, false, extack);
4601         spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4602
4603         return err;
4604 }
4605
4606 static int
4607 vxlan_fdb_external_learn_del(struct net_device *dev,
4608                              struct switchdev_notifier_vxlan_fdb_info *fdb_info)
4609 {
4610         struct vxlan_dev *vxlan = netdev_priv(dev);
4611         struct vxlan_fdb *f;
4612         u32 hash_index;
4613         int err = 0;
4614
4615         hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni);
4616         spin_lock_bh(&vxlan->hash_lock[hash_index]);
4617
4618         f = vxlan_find_mac(vxlan, fdb_info->eth_addr, fdb_info->vni);
4619         if (!f)
4620                 err = -ENOENT;
4621         else if (f->flags & NTF_EXT_LEARNED)
4622                 err = __vxlan_fdb_delete(vxlan, fdb_info->eth_addr,
4623                                          fdb_info->remote_ip,
4624                                          fdb_info->remote_port,
4625                                          fdb_info->vni,
4626                                          fdb_info->remote_vni,
4627                                          fdb_info->remote_ifindex,
4628                                          false);
4629
4630         spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4631
4632         return err;
4633 }
4634
4635 static int vxlan_switchdev_event(struct notifier_block *unused,
4636                                  unsigned long event, void *ptr)
4637 {
4638         struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
4639         struct switchdev_notifier_vxlan_fdb_info *fdb_info;
4640         int err = 0;
4641
4642         switch (event) {
4643         case SWITCHDEV_VXLAN_FDB_OFFLOADED:
4644                 vxlan_fdb_offloaded_set(dev, ptr);
4645                 break;
4646         case SWITCHDEV_VXLAN_FDB_ADD_TO_BRIDGE:
4647                 fdb_info = ptr;
4648                 err = vxlan_fdb_external_learn_add(dev, fdb_info);
4649                 if (err) {
4650                         err = notifier_from_errno(err);
4651                         break;
4652                 }
4653                 fdb_info->offloaded = true;
4654                 vxlan_fdb_offloaded_set(dev, fdb_info);
4655                 break;
4656         case SWITCHDEV_VXLAN_FDB_DEL_TO_BRIDGE:
4657                 fdb_info = ptr;
4658                 err = vxlan_fdb_external_learn_del(dev, fdb_info);
4659                 if (err) {
4660                         err = notifier_from_errno(err);
4661                         break;
4662                 }
4663                 fdb_info->offloaded = false;
4664                 vxlan_fdb_offloaded_set(dev, fdb_info);
4665                 break;
4666         }
4667
4668         return err;
4669 }
4670
4671 static struct notifier_block vxlan_switchdev_notifier_block __read_mostly = {
4672         .notifier_call = vxlan_switchdev_event,
4673 };
4674
4675 static void vxlan_fdb_nh_flush(struct nexthop *nh)
4676 {
4677         struct vxlan_fdb *fdb;
4678         struct vxlan_dev *vxlan;
4679         u32 hash_index;
4680
4681         rcu_read_lock();
4682         list_for_each_entry_rcu(fdb, &nh->fdb_list, nh_list) {
4683                 vxlan = rcu_dereference(fdb->vdev);
4684                 WARN_ON(!vxlan);
4685                 hash_index = fdb_head_index(vxlan, fdb->eth_addr,
4686                                             vxlan->default_dst.remote_vni);
4687                 spin_lock_bh(&vxlan->hash_lock[hash_index]);
4688                 if (!hlist_unhashed(&fdb->hlist))
4689                         vxlan_fdb_destroy(vxlan, fdb, false, false);
4690                 spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4691         }
4692         rcu_read_unlock();
4693 }
4694
4695 static int vxlan_nexthop_event(struct notifier_block *nb,
4696                                unsigned long event, void *ptr)
4697 {
4698         struct nexthop *nh = ptr;
4699
4700         if (!nh || event != NEXTHOP_EVENT_DEL)
4701                 return NOTIFY_DONE;
4702
4703         vxlan_fdb_nh_flush(nh);
4704
4705         return NOTIFY_DONE;
4706 }
4707
4708 static struct notifier_block vxlan_nexthop_notifier_block __read_mostly = {
4709         .notifier_call = vxlan_nexthop_event,
4710 };
4711
4712 static __net_init int vxlan_init_net(struct net *net)
4713 {
4714         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
4715         unsigned int h;
4716
4717         INIT_LIST_HEAD(&vn->vxlan_list);
4718         spin_lock_init(&vn->sock_lock);
4719
4720         for (h = 0; h < PORT_HASH_SIZE; ++h)
4721                 INIT_HLIST_HEAD(&vn->sock_list[h]);
4722
4723         return register_nexthop_notifier(net, &vxlan_nexthop_notifier_block);
4724 }
4725
4726 static void vxlan_destroy_tunnels(struct net *net, struct list_head *head)
4727 {
4728         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
4729         struct vxlan_dev *vxlan, *next;
4730         struct net_device *dev, *aux;
4731
4732         for_each_netdev_safe(net, dev, aux)
4733                 if (dev->rtnl_link_ops == &vxlan_link_ops)
4734                         unregister_netdevice_queue(dev, head);
4735
4736         list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
4737                 /* If vxlan->dev is in the same netns, it has already been added
4738                  * to the list by the previous loop.
4739                  */
4740                 if (!net_eq(dev_net(vxlan->dev), net))
4741                         unregister_netdevice_queue(vxlan->dev, head);
4742         }
4743
4744 }
4745
4746 static void __net_exit vxlan_exit_batch_net(struct list_head *net_list)
4747 {
4748         struct net *net;
4749         LIST_HEAD(list);
4750         unsigned int h;
4751
4752         rtnl_lock();
4753         list_for_each_entry(net, net_list, exit_list)
4754                 unregister_nexthop_notifier(net, &vxlan_nexthop_notifier_block);
4755         list_for_each_entry(net, net_list, exit_list)
4756                 vxlan_destroy_tunnels(net, &list);
4757
4758         unregister_netdevice_many(&list);
4759         rtnl_unlock();
4760
4761         list_for_each_entry(net, net_list, exit_list) {
4762                 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
4763
4764                 for (h = 0; h < PORT_HASH_SIZE; ++h)
4765                         WARN_ON_ONCE(!hlist_empty(&vn->sock_list[h]));
4766         }
4767 }
4768
4769 static struct pernet_operations vxlan_net_ops = {
4770         .init = vxlan_init_net,
4771         .exit_batch = vxlan_exit_batch_net,
4772         .id   = &vxlan_net_id,
4773         .size = sizeof(struct vxlan_net),
4774 };
4775
4776 static int __init vxlan_init_module(void)
4777 {
4778         int rc;
4779
4780         get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
4781
4782         rc = register_pernet_subsys(&vxlan_net_ops);
4783         if (rc)
4784                 goto out1;
4785
4786         rc = register_netdevice_notifier(&vxlan_notifier_block);
4787         if (rc)
4788                 goto out2;
4789
4790         rc = register_switchdev_notifier(&vxlan_switchdev_notifier_block);
4791         if (rc)
4792                 goto out3;
4793
4794         rc = rtnl_link_register(&vxlan_link_ops);
4795         if (rc)
4796                 goto out4;
4797
4798         return 0;
4799 out4:
4800         unregister_switchdev_notifier(&vxlan_switchdev_notifier_block);
4801 out3:
4802         unregister_netdevice_notifier(&vxlan_notifier_block);
4803 out2:
4804         unregister_pernet_subsys(&vxlan_net_ops);
4805 out1:
4806         return rc;
4807 }
4808 late_initcall(vxlan_init_module);
4809
4810 static void __exit vxlan_cleanup_module(void)
4811 {
4812         rtnl_link_unregister(&vxlan_link_ops);
4813         unregister_switchdev_notifier(&vxlan_switchdev_notifier_block);
4814         unregister_netdevice_notifier(&vxlan_notifier_block);
4815         unregister_pernet_subsys(&vxlan_net_ops);
4816         /* rcu_barrier() is called by netns */
4817 }
4818 module_exit(vxlan_cleanup_module);
4819
4820 MODULE_LICENSE("GPL");
4821 MODULE_VERSION(VXLAN_VERSION);
4822 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
4823 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
4824 MODULE_ALIAS_RTNL_LINK("vxlan");