drivers/net/vxlan.c

   1 /*
   2  * VXLAN: Virtual eXtensible Local Area Network
   3  *
   4  * Copyright (c) 2012-2013 Vyatta Inc.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  12
  13 #include <linux/kernel.h>
  14 #include <linux/module.h>
  15 #include <linux/errno.h>
  16 #include <linux/slab.h>
  17 #include <linux/udp.h>
  18 #include <linux/igmp.h>
  19 #include <linux/if_ether.h>
  20 #include <linux/ethtool.h>
  21 #include <net/arp.h>
  22 #include <net/ndisc.h>
  23 #include <net/ip.h>
  24 #include <net/icmp.h>
  25 #include <net/rtnetlink.h>
  26 #include <net/inet_ecn.h>
  27 #include <net/net_namespace.h>
  28 #include <net/netns/generic.h>
  29 #include <net/tun_proto.h>
  30 #include <net/vxlan.h>
  31
  32 #if IS_ENABLED(CONFIG_IPV6)
  33 #include <net/ip6_tunnel.h>
  34 #include <net/ip6_checksum.h>
  35 #endif
  36
  37 #define VXLAN_VERSION   "0.1"
  38
  39 #define PORT_HASH_BITS  8
  40 #define PORT_HASH_SIZE  (1<<PORT_HASH_BITS)
  41 #define FDB_AGE_DEFAULT 300 /* 5 min */
  42 #define FDB_AGE_INTERVAL (10 * HZ)      /* rescan interval */
  43
  44 /* UDP port for VXLAN traffic.
  45  * The IANA assigned port is 4789, but the Linux default is 8472
  46  * for compatibility with early adopters.
  47  */
  48 static unsigned short vxlan_port __read_mostly = 8472;
  49 module_param_named(udp_port, vxlan_port, ushort, 0444);
  50 MODULE_PARM_DESC(udp_port, "Destination UDP port");
  51
  52 static bool log_ecn_error = true;
  53 module_param(log_ecn_error, bool, 0644);
  54 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
  55
  56 static unsigned int vxlan_net_id;
  57 static struct rtnl_link_ops vxlan_link_ops;
  58
  59 static const u8 all_zeros_mac[ETH_ALEN + 2];
  60
  61 static int vxlan_sock_add(struct vxlan_dev *vxlan);
  62
  63 static void vxlan_vs_del_dev(struct vxlan_dev *vxlan);
  64
  65 /* per-network namespace private data for this module */
  66 struct vxlan_net {
  67         struct list_head  vxlan_list;
  68         struct hlist_head sock_list[PORT_HASH_SIZE];
  69         spinlock_t        sock_lock;
  70 };
  71
  72 /* Forwarding table entry */
  73 struct vxlan_fdb {
  74         struct hlist_node hlist;        /* linked list of entries */
  75         struct rcu_head   rcu;
  76         unsigned long     updated;      /* jiffies */
  77         unsigned long     used;
  78         struct list_head  remotes;
  79         u8                eth_addr[ETH_ALEN];
  80         u16               state;        /* see ndm_state */
  81         __be32            vni;
  82         u8                flags;        /* see ndm_flags */
  83 };
  84
  85 /* salt for hash table */
  86 static u32 vxlan_salt __read_mostly;
  87
  88 static inline bool vxlan_collect_metadata(struct vxlan_sock *vs)
  89 {
  90         return vs->flags & VXLAN_F_COLLECT_METADATA ||
  91                ip_tunnel_collect_metadata();
  92 }
  93
  94 #if IS_ENABLED(CONFIG_IPV6)
  95 static inline
  96 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
  97 {
  98         if (a->sa.sa_family != b->sa.sa_family)
  99                 return false;
 100         if (a->sa.sa_family == AF_INET6)
 101                 return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
 102         else
 103                 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
 104 }
 105
 106 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
 107 {
 108         if (ipa->sa.sa_family == AF_INET6)
 109                 return ipv6_addr_any(&ipa->sin6.sin6_addr);
 110         else
 111                 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
 112 }
 113
 114 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
 115 {
 116         if (ipa->sa.sa_family == AF_INET6)
 117                 return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr);
 118         else
 119                 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
 120 }
 121
 122 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
 123 {
 124         if (nla_len(nla) >= sizeof(struct in6_addr)) {
 125                 ip->sin6.sin6_addr = nla_get_in6_addr(nla);
 126                 ip->sa.sa_family = AF_INET6;
 127                 return 0;
 128         } else if (nla_len(nla) >= sizeof(__be32)) {
 129                 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
 130                 ip->sa.sa_family = AF_INET;
 131                 return 0;
 132         } else {
 133                 return -EAFNOSUPPORT;
 134         }
 135 }
 136
 137 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
 138                               const union vxlan_addr *ip)
 139 {
 140         if (ip->sa.sa_family == AF_INET6)
 141                 return nla_put_in6_addr(skb, attr, &ip->sin6.sin6_addr);
 142         else
 143                 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
 144 }
 145
 146 #else /* !CONFIG_IPV6 */
 147
 148 static inline
 149 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
 150 {
 151         return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
 152 }
 153
 154 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
 155 {
 156         return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
 157 }
 158
 159 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
 160 {
 161         return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
 162 }
 163
 164 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
 165 {
 166         if (nla_len(nla) >= sizeof(struct in6_addr)) {
 167                 return -EAFNOSUPPORT;
 168         } else if (nla_len(nla) >= sizeof(__be32)) {
 169                 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
 170                 ip->sa.sa_family = AF_INET;
 171                 return 0;
 172         } else {
 173                 return -EAFNOSUPPORT;
 174         }
 175 }
 176
 177 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
 178                               const union vxlan_addr *ip)
 179 {
 180         return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
 181 }
 182 #endif
 183
 184 /* Virtual Network hash table head */
 185 static inline struct hlist_head *vni_head(struct vxlan_sock *vs, __be32 vni)
 186 {
 187         return &vs->vni_list[hash_32((__force u32)vni, VNI_HASH_BITS)];
 188 }
 189
 190 /* Socket hash table head */
 191 static inline struct hlist_head *vs_head(struct net *net, __be16 port)
 192 {
 193         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
 194
 195         return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
 196 }
 197
 198 /* First remote destination for a forwarding entry.
 199  * Guaranteed to be non-NULL because remotes are never deleted.
 200  */
 201 static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
 202 {
 203         return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
 204 }
 205
 206 static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
 207 {
 208         return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
 209 }
 210
 211 /* Find VXLAN socket based on network namespace, address family and UDP port
 212  * and enabled unshareable flags.
 213  */
 214 static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family,
 215                                           __be16 port, u32 flags)
 216 {
 217         struct vxlan_sock *vs;
 218
 219         flags &= VXLAN_F_RCV_FLAGS;
 220
 221         hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
 222                 if (inet_sk(vs->sock->sk)->inet_sport == port &&
 223                     vxlan_get_sk_family(vs) == family &&
 224                     vs->flags == flags)
 225                         return vs;
 226         }
 227         return NULL;
 228 }
 229
 230 static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, int ifindex,
 231                                            __be32 vni)
 232 {
 233         struct vxlan_dev_node *node;
 234
 235         /* For flow based devices, map all packets to VNI 0 */
 236         if (vs->flags & VXLAN_F_COLLECT_METADATA)
 237                 vni = 0;
 238
 239         hlist_for_each_entry_rcu(node, vni_head(vs, vni), hlist) {
 240                 if (node->vxlan->default_dst.remote_vni != vni)
 241                         continue;
 242
 243                 if (IS_ENABLED(CONFIG_IPV6)) {
 244                         const struct vxlan_config *cfg = &node->vxlan->cfg;
 245
 246                         if ((cfg->flags & VXLAN_F_IPV6_LINKLOCAL) &&
 247                             cfg->remote_ifindex != ifindex)
 248                                 continue;
 249                 }
 250
 251                 return node->vxlan;
 252         }
 253
 254         return NULL;
 255 }
 256
 257 /* Look up VNI in a per net namespace table */
 258 static struct vxlan_dev *vxlan_find_vni(struct net *net, int ifindex,
 259                                         __be32 vni, sa_family_t family,
 260                                         __be16 port, u32 flags)
 261 {
 262         struct vxlan_sock *vs;
 263
 264         vs = vxlan_find_sock(net, family, port, flags);
 265         if (!vs)
 266                 return NULL;
 267
 268         return vxlan_vs_find_vni(vs, ifindex, vni);
 269 }
 270
 271 /* Fill in neighbour message in skbuff. */
 272 static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
 273                           const struct vxlan_fdb *fdb,
 274                           u32 portid, u32 seq, int type, unsigned int flags,
 275                           const struct vxlan_rdst *rdst)
 276 {
 277         unsigned long now = jiffies;
 278         struct nda_cacheinfo ci;
 279         struct nlmsghdr *nlh;
 280         struct ndmsg *ndm;
 281         bool send_ip, send_eth;
 282
 283         nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
 284         if (nlh == NULL)
 285                 return -EMSGSIZE;
 286
 287         ndm = nlmsg_data(nlh);
 288         memset(ndm, 0, sizeof(*ndm));
 289
 290         send_eth = send_ip = true;
 291
 292         if (type == RTM_GETNEIGH) {
 293                 send_ip = !vxlan_addr_any(&rdst->remote_ip);
 294                 send_eth = !is_zero_ether_addr(fdb->eth_addr);
 295                 ndm->ndm_family = send_ip ? rdst->remote_ip.sa.sa_family : AF_INET;
 296         } else
 297                 ndm->ndm_family = AF_BRIDGE;
 298         ndm->ndm_state = fdb->state;
 299         ndm->ndm_ifindex = vxlan->dev->ifindex;
 300         ndm->ndm_flags = fdb->flags;
 301         ndm->ndm_type = RTN_UNICAST;
 302
 303         if (!net_eq(dev_net(vxlan->dev), vxlan->net) &&
 304             nla_put_s32(skb, NDA_LINK_NETNSID,
 305                         peernet2id(dev_net(vxlan->dev), vxlan->net)))
 306                 goto nla_put_failure;
 307
 308         if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
 309                 goto nla_put_failure;
 310
 311         if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
 312                 goto nla_put_failure;
 313
 314         if (rdst->remote_port && rdst->remote_port != vxlan->cfg.dst_port &&
 315             nla_put_be16(skb, NDA_PORT, rdst->remote_port))
 316                 goto nla_put_failure;
 317         if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
 318             nla_put_u32(skb, NDA_VNI, be32_to_cpu(rdst->remote_vni)))
 319                 goto nla_put_failure;
 320         if ((vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) && fdb->vni &&
 321             nla_put_u32(skb, NDA_SRC_VNI,
 322                         be32_to_cpu(fdb->vni)))
 323                 goto nla_put_failure;
 324         if (rdst->remote_ifindex &&
 325             nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
 326                 goto nla_put_failure;
 327
 328         ci.ndm_used      = jiffies_to_clock_t(now - fdb->used);
 329         ci.ndm_confirmed = 0;
 330         ci.ndm_updated   = jiffies_to_clock_t(now - fdb->updated);
 331         ci.ndm_refcnt    = 0;
 332
 333         if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
 334                 goto nla_put_failure;
 335
 336         nlmsg_end(skb, nlh);
 337         return 0;
 338
 339 nla_put_failure:
 340         nlmsg_cancel(skb, nlh);
 341         return -EMSGSIZE;
 342 }
 343
 344 static inline size_t vxlan_nlmsg_size(void)
 345 {
 346         return NLMSG_ALIGN(sizeof(struct ndmsg))
 347                 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
 348                 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
 349                 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
 350                 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
 351                 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
 352                 + nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */
 353                 + nla_total_size(sizeof(struct nda_cacheinfo));
 354 }
 355
 356 static void vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
 357                              struct vxlan_rdst *rd, int type)
 358 {
 359         struct net *net = dev_net(vxlan->dev);
 360         struct sk_buff *skb;
 361         int err = -ENOBUFS;
 362
 363         skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
 364         if (skb == NULL)
 365                 goto errout;
 366
 367         err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
 368         if (err < 0) {
 369                 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
 370                 WARN_ON(err == -EMSGSIZE);
 371                 kfree_skb(skb);
 372                 goto errout;
 373         }
 374
 375         rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
 376         return;
 377 errout:
 378         if (err < 0)
 379                 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
 380 }
 381
 382 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
 383 {
 384         struct vxlan_dev *vxlan = netdev_priv(dev);
 385         struct vxlan_fdb f = {
 386                 .state = NUD_STALE,
 387         };
 388         struct vxlan_rdst remote = {
 389                 .remote_ip = *ipa, /* goes to NDA_DST */
 390                 .remote_vni = cpu_to_be32(VXLAN_N_VID),
 391         };
 392
 393         vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
 394 }
 395
 396 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
 397 {
 398         struct vxlan_fdb f = {
 399                 .state = NUD_STALE,
 400         };
 401         struct vxlan_rdst remote = { };
 402
 403         memcpy(f.eth_addr, eth_addr, ETH_ALEN);
 404
 405         vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
 406 }
 407
 408 /* Hash Ethernet address */
 409 static u32 eth_hash(const unsigned char *addr)
 410 {
 411         u64 value = get_unaligned((u64 *)addr);
 412
 413         /* only want 6 bytes */
 414 #ifdef __BIG_ENDIAN
 415         value >>= 16;
 416 #else
 417         value <<= 16;
 418 #endif
 419         return hash_64(value, FDB_HASH_BITS);
 420 }
 421
 422 static u32 eth_vni_hash(const unsigned char *addr, __be32 vni)
 423 {
 424         /* use 1 byte of OUI and 3 bytes of NIC */
 425         u32 key = get_unaligned((u32 *)(addr + 2));
 426
 427         return jhash_2words(key, vni, vxlan_salt) & (FDB_HASH_SIZE - 1);
 428 }
 429
 430 /* Hash chain to use given mac address */
 431 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
 432                                                 const u8 *mac, __be32 vni)
 433 {
 434         if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)
 435                 return &vxlan->fdb_head[eth_vni_hash(mac, vni)];
 436         else
 437                 return &vxlan->fdb_head[eth_hash(mac)];
 438 }
 439
 440 /* Look up Ethernet address in forwarding table */
 441 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
 442                                           const u8 *mac, __be32 vni)
 443 {
 444         struct hlist_head *head = vxlan_fdb_head(vxlan, mac, vni);
 445         struct vxlan_fdb *f;
 446
 447         hlist_for_each_entry_rcu(f, head, hlist) {
 448                 if (ether_addr_equal(mac, f->eth_addr)) {
 449                         if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) {
 450                                 if (vni == f->vni)
 451                                         return f;
 452                         } else {
 453                                 return f;
 454                         }
 455                 }
 456         }
 457
 458         return NULL;
 459 }
 460
 461 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
 462                                         const u8 *mac, __be32 vni)
 463 {
 464         struct vxlan_fdb *f;
 465
 466         f = __vxlan_find_mac(vxlan, mac, vni);
 467         if (f)
 468                 f->used = jiffies;
 469
 470         return f;
 471 }
 472
 473 /* caller should hold vxlan->hash_lock */
 474 static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
 475                                               union vxlan_addr *ip, __be16 port,
 476                                               __be32 vni, __u32 ifindex)
 477 {
 478         struct vxlan_rdst *rd;
 479
 480         list_for_each_entry(rd, &f->remotes, list) {
 481                 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
 482                     rd->remote_port == port &&
 483                     rd->remote_vni == vni &&
 484                     rd->remote_ifindex == ifindex)
 485                         return rd;
 486         }
 487
 488         return NULL;
 489 }
 490
 491 /* Replace destination of unicast mac */
 492 static int vxlan_fdb_replace(struct vxlan_fdb *f,
 493                              union vxlan_addr *ip, __be16 port, __be32 vni,
 494                              __u32 ifindex)
 495 {
 496         struct vxlan_rdst *rd;
 497
 498         rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
 499         if (rd)
 500                 return 0;
 501
 502         rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
 503         if (!rd)
 504                 return 0;
 505
 506         dst_cache_reset(&rd->dst_cache);
 507         rd->remote_ip = *ip;
 508         rd->remote_port = port;
 509         rd->remote_vni = vni;
 510         rd->remote_ifindex = ifindex;
 511         return 1;
 512 }
 513
 514 /* Add/update destinations for multicast */
 515 static int vxlan_fdb_append(struct vxlan_fdb *f,
 516                             union vxlan_addr *ip, __be16 port, __be32 vni,
 517                             __u32 ifindex, struct vxlan_rdst **rdp)
 518 {
 519         struct vxlan_rdst *rd;
 520
 521         rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
 522         if (rd)
 523                 return 0;
 524
 525         rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
 526         if (rd == NULL)
 527                 return -ENOMEM;
 528
 529         if (dst_cache_init(&rd->dst_cache, GFP_ATOMIC)) {
 530                 kfree(rd);
 531                 return -ENOMEM;
 532         }
 533
 534         rd->remote_ip = *ip;
 535         rd->remote_port = port;
 536         rd->remote_vni = vni;
 537         rd->remote_ifindex = ifindex;
 538
 539         list_add_tail_rcu(&rd->list, &f->remotes);
 540
 541         *rdp = rd;
 542         return 1;
 543 }
 544
 545 static bool vxlan_parse_gpe_proto(struct vxlanhdr *hdr, __be16 *protocol)
 546 {
 547         struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)hdr;
 548
 549         /* Need to have Next Protocol set for interfaces in GPE mode. */
 550         if (!gpe->np_applied)
 551                 return false;
 552         /* "The initial version is 0. If a receiver does not support the
 553          * version indicated it MUST drop the packet.
 554          */
 555         if (gpe->version != 0)
 556                 return false;
 557         /* "When the O bit is set to 1, the packet is an OAM packet and OAM
 558          * processing MUST occur." However, we don't implement OAM
 559          * processing, thus drop the packet.
 560          */
 561         if (gpe->oam_flag)
 562                 return false;
 563
 564         *protocol = tun_p_to_eth_p(gpe->next_protocol);
 565         if (!*protocol)
 566                 return false;
 567
 568         return true;
 569 }
 570
 571 static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
 572                                           unsigned int off,
 573                                           struct vxlanhdr *vh, size_t hdrlen,
 574                                           __be32 vni_field,
 575                                           struct gro_remcsum *grc,
 576                                           bool nopartial)
 577 {
 578         size_t start, offset;
 579
 580         if (skb->remcsum_offload)
 581                 return vh;
 582
 583         if (!NAPI_GRO_CB(skb)->csum_valid)
 584                 return NULL;
 585
 586         start = vxlan_rco_start(vni_field);
 587         offset = start + vxlan_rco_offset(vni_field);
 588
 589         vh = skb_gro_remcsum_process(skb, (void *)vh, off, hdrlen,
 590                                      start, offset, grc, nopartial);
 591
 592         skb->remcsum_offload = 1;
 593
 594         return vh;
 595 }
 596
 597 static struct sk_buff *vxlan_gro_receive(struct sock *sk,
 598                                          struct list_head *head,
 599                                          struct sk_buff *skb)
 600 {
 601         struct sk_buff *pp = NULL;
 602         struct sk_buff *p;
 603         struct vxlanhdr *vh, *vh2;
 604         unsigned int hlen, off_vx;
 605         int flush = 1;
 606         struct vxlan_sock *vs = rcu_dereference_sk_user_data(sk);
 607         __be32 flags;
 608         struct gro_remcsum grc;
 609
 610         skb_gro_remcsum_init(&grc);
 611
 612         off_vx = skb_gro_offset(skb);
 613         hlen = off_vx + sizeof(*vh);
 614         vh   = skb_gro_header_fast(skb, off_vx);
 615         if (skb_gro_header_hard(skb, hlen)) {
 616                 vh = skb_gro_header_slow(skb, hlen, off_vx);
 617                 if (unlikely(!vh))
 618                         goto out;
 619         }
 620
 621         skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
 622
 623         flags = vh->vx_flags;
 624
 625         if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
 626                 vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
 627                                        vh->vx_vni, &grc,
 628                                        !!(vs->flags &
 629                                           VXLAN_F_REMCSUM_NOPARTIAL));
 630
 631                 if (!vh)
 632                         goto out;
 633         }
 634
 635         skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
 636
 637         list_for_each_entry(p, head, list) {
 638                 if (!NAPI_GRO_CB(p)->same_flow)
 639                         continue;
 640
 641                 vh2 = (struct vxlanhdr *)(p->data + off_vx);
 642                 if (vh->vx_flags != vh2->vx_flags ||
 643                     vh->vx_vni != vh2->vx_vni) {
 644                         NAPI_GRO_CB(p)->same_flow = 0;
 645                         continue;
 646                 }
 647         }
 648
 649         pp = call_gro_receive(eth_gro_receive, head, skb);
 650         flush = 0;
 651
 652 out:
 653         skb_gro_flush_final_remcsum(skb, pp, flush, &grc);
 654
 655         return pp;
 656 }
 657
 658 static int vxlan_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff)
 659 {
 660         /* Sets 'skb->inner_mac_header' since we are always called with
 661          * 'skb->encapsulation' set.
 662          */
 663         return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
 664 }
 665
 666 static struct vxlan_fdb *vxlan_fdb_alloc(struct vxlan_dev *vxlan,
 667                                          const u8 *mac, __u16 state,
 668                                          __be32 src_vni, __u8 ndm_flags)
 669 {
 670         struct vxlan_fdb *f;
 671
 672         f = kmalloc(sizeof(*f), GFP_ATOMIC);
 673         if (!f)
 674                 return NULL;
 675         f->state = state;
 676         f->flags = ndm_flags;
 677         f->updated = f->used = jiffies;
 678         f->vni = src_vni;
 679         INIT_LIST_HEAD(&f->remotes);
 680         memcpy(f->eth_addr, mac, ETH_ALEN);
 681
 682         return f;
 683 }
 684
 685 static int vxlan_fdb_create(struct vxlan_dev *vxlan,
 686                             const u8 *mac, union vxlan_addr *ip,
 687                             __u16 state, __be16 port, __be32 src_vni,
 688                             __be32 vni, __u32 ifindex, __u8 ndm_flags,
 689                             struct vxlan_fdb **fdb)
 690 {
 691         struct vxlan_rdst *rd = NULL;
 692         struct vxlan_fdb *f;
 693         int rc;
 694
 695         if (vxlan->cfg.addrmax &&
 696             vxlan->addrcnt >= vxlan->cfg.addrmax)
 697                 return -ENOSPC;
 698
 699         netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
 700         f = vxlan_fdb_alloc(vxlan, mac, state, src_vni, ndm_flags);
 701         if (!f)
 702                 return -ENOMEM;
 703
 704         rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
 705         if (rc < 0) {
 706                 kfree(f);
 707                 return rc;
 708         }
 709
 710         ++vxlan->addrcnt;
 711         hlist_add_head_rcu(&f->hlist,
 712                            vxlan_fdb_head(vxlan, mac, src_vni));
 713
 714         *fdb = f;
 715
 716         return 0;
 717 }
 718
 719 /* Add new entry to forwarding table -- assumes lock held */
 720 static int vxlan_fdb_update(struct vxlan_dev *vxlan,
 721                             const u8 *mac, union vxlan_addr *ip,
 722                             __u16 state, __u16 flags,
 723                             __be16 port, __be32 src_vni, __be32 vni,
 724                             __u32 ifindex, __u8 ndm_flags)
 725 {
 726         struct vxlan_rdst *rd = NULL;
 727         struct vxlan_fdb *f;
 728         int notify = 0;
 729         int rc;
 730
 731         f = __vxlan_find_mac(vxlan, mac, src_vni);
 732         if (f) {
 733                 if (flags & NLM_F_EXCL) {
 734                         netdev_dbg(vxlan->dev,
 735                                    "lost race to create %pM\n", mac);
 736                         return -EEXIST;
 737                 }
 738                 if (f->state != state) {
 739                         f->state = state;
 740                         f->updated = jiffies;
 741                         notify = 1;
 742                 }
 743                 if (f->flags != ndm_flags) {
 744                         f->flags = ndm_flags;
 745                         f->updated = jiffies;
 746                         notify = 1;
 747                 }
 748                 if ((flags & NLM_F_REPLACE)) {
 749                         /* Only change unicasts */
 750                         if (!(is_multicast_ether_addr(f->eth_addr) ||
 751                              is_zero_ether_addr(f->eth_addr))) {
 752                                 notify |= vxlan_fdb_replace(f, ip, port, vni,
 753                                                            ifindex);
 754                         } else
 755                                 return -EOPNOTSUPP;
 756                 }
 757                 if ((flags & NLM_F_APPEND) &&
 758                     (is_multicast_ether_addr(f->eth_addr) ||
 759                      is_zero_ether_addr(f->eth_addr))) {
 760                         rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
 761
 762                         if (rc < 0)
 763                                 return rc;
 764                         notify |= rc;
 765                 }
 766         } else {
 767                 if (!(flags & NLM_F_CREATE))
 768                         return -ENOENT;
 769
 770                 /* Disallow replace to add a multicast entry */
 771                 if ((flags & NLM_F_REPLACE) &&
 772                     (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
 773                         return -EOPNOTSUPP;
 774
 775                 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
 776                 rc = vxlan_fdb_create(vxlan, mac, ip, state, port, src_vni,
 777                                       vni, ifindex, ndm_flags, &f);
 778                 if (rc < 0)
 779                         return rc;
 780                 notify = 1;
 781         }
 782
 783         if (notify) {
 784                 if (rd == NULL)
 785                         rd = first_remote_rtnl(f);
 786                 vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH);
 787         }
 788
 789         return 0;
 790 }
 791
 792 static void vxlan_fdb_free(struct rcu_head *head)
 793 {
 794         struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
 795         struct vxlan_rdst *rd, *nd;
 796
 797         list_for_each_entry_safe(rd, nd, &f->remotes, list) {
 798                 dst_cache_destroy(&rd->dst_cache);
 799                 kfree(rd);
 800         }
 801         kfree(f);
 802 }
 803
 804 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f,
 805                               bool do_notify)
 806 {
 807         netdev_dbg(vxlan->dev,
 808                     "delete %pM\n", f->eth_addr);
 809
 810         --vxlan->addrcnt;
 811         if (do_notify)
 812                 vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_DELNEIGH);
 813
 814         hlist_del_rcu(&f->hlist);
 815         call_rcu(&f->rcu, vxlan_fdb_free);
 816 }
 817
 818 static void vxlan_dst_free(struct rcu_head *head)
 819 {
 820         struct vxlan_rdst *rd = container_of(head, struct vxlan_rdst, rcu);
 821
 822         dst_cache_destroy(&rd->dst_cache);
 823         kfree(rd);
 824 }
 825
 826 static void vxlan_fdb_dst_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f,
 827                                   struct vxlan_rdst *rd)
 828 {
 829         list_del_rcu(&rd->list);
 830         vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH);
 831         call_rcu(&rd->rcu, vxlan_dst_free);
 832 }
 833
 834 static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
 835                            union vxlan_addr *ip, __be16 *port, __be32 *src_vni,
 836                            __be32 *vni, u32 *ifindex)
 837 {
 838         struct net *net = dev_net(vxlan->dev);
 839         int err;
 840
 841         if (tb[NDA_DST]) {
 842                 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
 843                 if (err)
 844                         return err;
 845         } else {
 846                 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
 847                 if (remote->sa.sa_family == AF_INET) {
 848                         ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
 849                         ip->sa.sa_family = AF_INET;
 850 #if IS_ENABLED(CONFIG_IPV6)
 851                 } else {
 852                         ip->sin6.sin6_addr = in6addr_any;
 853                         ip->sa.sa_family = AF_INET6;
 854 #endif
 855                 }
 856         }
 857
 858         if (tb[NDA_PORT]) {
 859                 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
 860                         return -EINVAL;
 861                 *port = nla_get_be16(tb[NDA_PORT]);
 862         } else {
 863                 *port = vxlan->cfg.dst_port;
 864         }
 865
 866         if (tb[NDA_VNI]) {
 867                 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
 868                         return -EINVAL;
 869                 *vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
 870         } else {
 871                 *vni = vxlan->default_dst.remote_vni;
 872         }
 873
 874         if (tb[NDA_SRC_VNI]) {
 875                 if (nla_len(tb[NDA_SRC_VNI]) != sizeof(u32))
 876                         return -EINVAL;
 877                 *src_vni = cpu_to_be32(nla_get_u32(tb[NDA_SRC_VNI]));
 878         } else {
 879                 *src_vni = vxlan->default_dst.remote_vni;
 880         }
 881
 882         if (tb[NDA_IFINDEX]) {
 883                 struct net_device *tdev;
 884
 885                 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
 886                         return -EINVAL;
 887                 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
 888                 tdev = __dev_get_by_index(net, *ifindex);
 889                 if (!tdev)
 890                         return -EADDRNOTAVAIL;
 891         } else {
 892                 *ifindex = 0;
 893         }
 894
 895         return 0;
 896 }
 897
 898 /* Add static entry (via netlink) */
 899 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
 900                          struct net_device *dev,
 901                          const unsigned char *addr, u16 vid, u16 flags)
 902 {
 903         struct vxlan_dev *vxlan = netdev_priv(dev);
 904         /* struct net *net = dev_net(vxlan->dev); */
 905         union vxlan_addr ip;
 906         __be16 port;
 907         __be32 src_vni, vni;
 908         u32 ifindex;
 909         int err;
 910
 911         if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
 912                 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
 913                         ndm->ndm_state);
 914                 return -EINVAL;
 915         }
 916
 917         if (tb[NDA_DST] == NULL)
 918                 return -EINVAL;
 919
 920         err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex);
 921         if (err)
 922                 return err;
 923
 924         if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
 925                 return -EAFNOSUPPORT;
 926
 927         spin_lock_bh(&vxlan->hash_lock);
 928         err = vxlan_fdb_update(vxlan, addr, &ip, ndm->ndm_state, flags,
 929                                port, src_vni, vni, ifindex, ndm->ndm_flags);
 930         spin_unlock_bh(&vxlan->hash_lock);
 931
 932         return err;
 933 }
 934
 935 static int __vxlan_fdb_delete(struct vxlan_dev *vxlan,
 936                               const unsigned char *addr, union vxlan_addr ip,
 937                               __be16 port, __be32 src_vni, __be32 vni,
 938                               u32 ifindex, u16 vid)
 939 {
 940         struct vxlan_fdb *f;
 941         struct vxlan_rdst *rd = NULL;
 942         int err = -ENOENT;
 943
 944         f = vxlan_find_mac(vxlan, addr, src_vni);
 945         if (!f)
 946                 return err;
 947
 948         if (!vxlan_addr_any(&ip)) {
 949                 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
 950                 if (!rd)
 951                         goto out;
 952         }
 953
 954         /* remove a destination if it's not the only one on the list,
 955          * otherwise destroy the fdb entry
 956          */
 957         if (rd && !list_is_singular(&f->remotes)) {
 958                 vxlan_fdb_dst_destroy(vxlan, f, rd);
 959                 goto out;
 960         }
 961
 962         vxlan_fdb_destroy(vxlan, f, true);
 963
 964 out:
 965         return 0;
 966 }
 967
 968 /* Delete entry (via netlink) */
 969 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
 970                             struct net_device *dev,
 971                             const unsigned char *addr, u16 vid)
 972 {
 973         struct vxlan_dev *vxlan = netdev_priv(dev);
 974         union vxlan_addr ip;
 975         __be32 src_vni, vni;
 976         __be16 port;
 977         u32 ifindex;
 978         int err;
 979
 980         err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex);
 981         if (err)
 982                 return err;
 983
 984         spin_lock_bh(&vxlan->hash_lock);
 985         err = __vxlan_fdb_delete(vxlan, addr, ip, port, src_vni, vni, ifindex,
 986                                  vid);
 987         spin_unlock_bh(&vxlan->hash_lock);
 988
 989         return err;
 990 }
 991
 992 /* Dump forwarding table */
 993 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
 994                           struct net_device *dev,
 995                           struct net_device *filter_dev, int *idx)
 996 {
 997         struct vxlan_dev *vxlan = netdev_priv(dev);
 998         unsigned int h;
 999         int err = 0;
1000
1001         for (h = 0; h < FDB_HASH_SIZE; ++h) {
1002                 struct vxlan_fdb *f;
1003
1004                 rcu_read_lock();
1005                 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
1006                         struct vxlan_rdst *rd;
1007
1008                         list_for_each_entry_rcu(rd, &f->remotes, list) {
1009                                 if (*idx < cb->args[2])
1010                                         goto skip;
1011
1012                                 err = vxlan_fdb_info(skb, vxlan, f,
1013                                                      NETLINK_CB(cb->skb).portid,
1014                                                      cb->nlh->nlmsg_seq,
1015                                                      RTM_NEWNEIGH,
1016                                                      NLM_F_MULTI, rd);
1017                                 if (err < 0) {
1018                                         rcu_read_unlock();
1019                                         goto out;
1020                                 }
1021 skip:
1022                                 *idx += 1;
1023                         }
1024                 }
1025                 rcu_read_unlock();
1026         }
1027 out:
1028         return err;
1029 }
1030
1031 /* Watch incoming packets to learn mapping between Ethernet address
1032  * and Tunnel endpoint.
1033  * Return true if packet is bogus and should be dropped.
1034  */
1035 static bool vxlan_snoop(struct net_device *dev,
1036                         union vxlan_addr *src_ip, const u8 *src_mac,
1037                         u32 src_ifindex, __be32 vni)
1038 {
1039         struct vxlan_dev *vxlan = netdev_priv(dev);
1040         struct vxlan_fdb *f;
1041         u32 ifindex = 0;
1042
1043 #if IS_ENABLED(CONFIG_IPV6)
1044         if (src_ip->sa.sa_family == AF_INET6 &&
1045             (ipv6_addr_type(&src_ip->sin6.sin6_addr) & IPV6_ADDR_LINKLOCAL))
1046                 ifindex = src_ifindex;
1047 #endif
1048
1049         f = vxlan_find_mac(vxlan, src_mac, vni);
1050         if (likely(f)) {
1051                 struct vxlan_rdst *rdst = first_remote_rcu(f);
1052
1053                 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip) &&
1054                            rdst->remote_ifindex == ifindex))
1055                         return false;
1056
1057                 /* Don't migrate static entries, drop packets */
1058                 if (f->state & (NUD_PERMANENT | NUD_NOARP))
1059                         return true;
1060
1061                 if (net_ratelimit())
1062                         netdev_info(dev,
1063                                     "%pM migrated from %pIS to %pIS\n",
1064                                     src_mac, &rdst->remote_ip.sa, &src_ip->sa);
1065
1066                 rdst->remote_ip = *src_ip;
1067                 f->updated = jiffies;
1068                 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH);
1069         } else {
1070                 /* learned new entry */
1071                 spin_lock(&vxlan->hash_lock);
1072
1073                 /* close off race between vxlan_flush and incoming packets */
1074                 if (netif_running(dev))
1075                         vxlan_fdb_update(vxlan, src_mac, src_ip,
1076                                          NUD_REACHABLE,
1077                                          NLM_F_EXCL|NLM_F_CREATE,
1078                                          vxlan->cfg.dst_port,
1079                                          vni,
1080                                          vxlan->default_dst.remote_vni,
1081                                          ifindex, NTF_SELF);
1082                 spin_unlock(&vxlan->hash_lock);
1083         }
1084
1085         return false;
1086 }
1087
1088 /* See if multicast group is already in use by other ID */
1089 static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
1090 {
1091         struct vxlan_dev *vxlan;
1092         struct vxlan_sock *sock4;
1093 #if IS_ENABLED(CONFIG_IPV6)
1094         struct vxlan_sock *sock6;
1095 #endif
1096         unsigned short family = dev->default_dst.remote_ip.sa.sa_family;
1097
1098         sock4 = rtnl_dereference(dev->vn4_sock);
1099
1100         /* The vxlan_sock is only used by dev, leaving group has
1101          * no effect on other vxlan devices.
1102          */
1103         if (family == AF_INET && sock4 && refcount_read(&sock4->refcnt) == 1)
1104                 return false;
1105 #if IS_ENABLED(CONFIG_IPV6)
1106         sock6 = rtnl_dereference(dev->vn6_sock);
1107         if (family == AF_INET6 && sock6 && refcount_read(&sock6->refcnt) == 1)
1108                 return false;
1109 #endif
1110
1111         list_for_each_entry(vxlan, &vn->vxlan_list, next) {
1112                 if (!netif_running(vxlan->dev) || vxlan == dev)
1113                         continue;
1114
1115                 if (family == AF_INET &&
1116                     rtnl_dereference(vxlan->vn4_sock) != sock4)
1117                         continue;
1118 #if IS_ENABLED(CONFIG_IPV6)
1119                 if (family == AF_INET6 &&
1120                     rtnl_dereference(vxlan->vn6_sock) != sock6)
1121                         continue;
1122 #endif
1123
1124                 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
1125                                       &dev->default_dst.remote_ip))
1126                         continue;
1127
1128                 if (vxlan->default_dst.remote_ifindex !=
1129                     dev->default_dst.remote_ifindex)
1130                         continue;
1131
1132                 return true;
1133         }
1134
1135         return false;
1136 }
1137
1138 static bool __vxlan_sock_release_prep(struct vxlan_sock *vs)
1139 {
1140         struct vxlan_net *vn;
1141
1142         if (!vs)
1143                 return false;
1144         if (!refcount_dec_and_test(&vs->refcnt))
1145                 return false;
1146
1147         vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id);
1148         spin_lock(&vn->sock_lock);
1149         hlist_del_rcu(&vs->hlist);
1150         udp_tunnel_notify_del_rx_port(vs->sock,
1151                                       (vs->flags & VXLAN_F_GPE) ?
1152                                       UDP_TUNNEL_TYPE_VXLAN_GPE :
1153                                       UDP_TUNNEL_TYPE_VXLAN);
1154         spin_unlock(&vn->sock_lock);
1155
1156         return true;
1157 }
1158
1159 static void vxlan_sock_release(struct vxlan_dev *vxlan)
1160 {
1161         struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1162 #if IS_ENABLED(CONFIG_IPV6)
1163         struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1164
1165         RCU_INIT_POINTER(vxlan->vn6_sock, NULL);
1166 #endif
1167
1168         RCU_INIT_POINTER(vxlan->vn4_sock, NULL);
1169         synchronize_net();
1170
1171         vxlan_vs_del_dev(vxlan);
1172
1173         if (__vxlan_sock_release_prep(sock4)) {
1174                 udp_tunnel_sock_release(sock4->sock);
1175                 kfree(sock4);
1176         }
1177
1178 #if IS_ENABLED(CONFIG_IPV6)
1179         if (__vxlan_sock_release_prep(sock6)) {
1180                 udp_tunnel_sock_release(sock6->sock);
1181                 kfree(sock6);
1182         }
1183 #endif
1184 }
1185
1186 /* Update multicast group membership when first VNI on
1187  * multicast address is brought up
1188  */
1189 static int vxlan_igmp_join(struct vxlan_dev *vxlan)
1190 {
1191         struct sock *sk;
1192         union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1193         int ifindex = vxlan->default_dst.remote_ifindex;
1194         int ret = -EINVAL;
1195
1196         if (ip->sa.sa_family == AF_INET) {
1197                 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1198                 struct ip_mreqn mreq = {
1199                         .imr_multiaddr.s_addr   = ip->sin.sin_addr.s_addr,
1200                         .imr_ifindex            = ifindex,
1201                 };
1202
1203                 sk = sock4->sock->sk;
1204                 lock_sock(sk);
1205                 ret = ip_mc_join_group(sk, &mreq);
1206                 release_sock(sk);
1207 #if IS_ENABLED(CONFIG_IPV6)
1208         } else {
1209                 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1210
1211                 sk = sock6->sock->sk;
1212                 lock_sock(sk);
1213                 ret = ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1214                                                    &ip->sin6.sin6_addr);
1215                 release_sock(sk);
1216 #endif
1217         }
1218
1219         return ret;
1220 }
1221
1222 /* Inverse of vxlan_igmp_join when last VNI is brought down */
1223 static int vxlan_igmp_leave(struct vxlan_dev *vxlan)
1224 {
1225         struct sock *sk;
1226         union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1227         int ifindex = vxlan->default_dst.remote_ifindex;
1228         int ret = -EINVAL;
1229
1230         if (ip->sa.sa_family == AF_INET) {
1231                 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1232                 struct ip_mreqn mreq = {
1233                         .imr_multiaddr.s_addr   = ip->sin.sin_addr.s_addr,
1234                         .imr_ifindex            = ifindex,
1235                 };
1236
1237                 sk = sock4->sock->sk;
1238                 lock_sock(sk);
1239                 ret = ip_mc_leave_group(sk, &mreq);
1240                 release_sock(sk);
1241 #if IS_ENABLED(CONFIG_IPV6)
1242         } else {
1243                 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1244
1245                 sk = sock6->sock->sk;
1246                 lock_sock(sk);
1247                 ret = ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1248                                                    &ip->sin6.sin6_addr);
1249                 release_sock(sk);
1250 #endif
1251         }
1252
1253         return ret;
1254 }
1255
1256 static bool vxlan_remcsum(struct vxlanhdr *unparsed,
1257                           struct sk_buff *skb, u32 vxflags)
1258 {
1259         size_t start, offset;
1260
1261         if (!(unparsed->vx_flags & VXLAN_HF_RCO) || skb->remcsum_offload)
1262                 goto out;
1263
1264         start = vxlan_rco_start(unparsed->vx_vni);
1265         offset = start + vxlan_rco_offset(unparsed->vx_vni);
1266
1267         if (!pskb_may_pull(skb, offset + sizeof(u16)))
1268                 return false;
1269
1270         skb_remcsum_process(skb, (void *)(vxlan_hdr(skb) + 1), start, offset,
1271                             !!(vxflags & VXLAN_F_REMCSUM_NOPARTIAL));
1272 out:
1273         unparsed->vx_flags &= ~VXLAN_HF_RCO;
1274         unparsed->vx_vni &= VXLAN_VNI_MASK;
1275         return true;
1276 }
1277
1278 static void vxlan_parse_gbp_hdr(struct vxlanhdr *unparsed,
1279                                 struct sk_buff *skb, u32 vxflags,
1280                                 struct vxlan_metadata *md)
1281 {
1282         struct vxlanhdr_gbp *gbp = (struct vxlanhdr_gbp *)unparsed;
1283         struct metadata_dst *tun_dst;
1284
1285         if (!(unparsed->vx_flags & VXLAN_HF_GBP))
1286                 goto out;
1287
1288         md->gbp = ntohs(gbp->policy_id);
1289
1290         tun_dst = (struct metadata_dst *)skb_dst(skb);
1291         if (tun_dst) {
1292                 tun_dst->u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT;
1293                 tun_dst->u.tun_info.options_len = sizeof(*md);
1294         }
1295         if (gbp->dont_learn)
1296                 md->gbp |= VXLAN_GBP_DONT_LEARN;
1297
1298         if (gbp->policy_applied)
1299                 md->gbp |= VXLAN_GBP_POLICY_APPLIED;
1300
1301         /* In flow-based mode, GBP is carried in dst_metadata */
1302         if (!(vxflags & VXLAN_F_COLLECT_METADATA))
1303                 skb->mark = md->gbp;
1304 out:
1305         unparsed->vx_flags &= ~VXLAN_GBP_USED_BITS;
1306 }
1307
1308 static bool vxlan_set_mac(struct vxlan_dev *vxlan,
1309                           struct vxlan_sock *vs,
1310                           struct sk_buff *skb, __be32 vni)
1311 {
1312         union vxlan_addr saddr;
1313         u32 ifindex = skb->dev->ifindex;
1314
1315         skb_reset_mac_header(skb);
1316         skb->protocol = eth_type_trans(skb, vxlan->dev);
1317         skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1318
1319         /* Ignore packet loops (and multicast echo) */
1320         if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1321                 return false;
1322
1323         /* Ignore packets from invalid src-address */
1324         if (!is_valid_ether_addr(eth_hdr(skb)->h_source))
1325                 return false;
1326
1327         /* Get address from the outer IP header */
1328         if (vxlan_get_sk_family(vs) == AF_INET) {
1329                 saddr.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
1330                 saddr.sa.sa_family = AF_INET;
1331 #if IS_ENABLED(CONFIG_IPV6)
1332         } else {
1333                 saddr.sin6.sin6_addr = ipv6_hdr(skb)->saddr;
1334                 saddr.sa.sa_family = AF_INET6;
1335 #endif
1336         }
1337
1338         if ((vxlan->cfg.flags & VXLAN_F_LEARN) &&
1339             vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source, ifindex, vni))
1340                 return false;
1341
1342         return true;
1343 }
1344
1345 static bool vxlan_ecn_decapsulate(struct vxlan_sock *vs, void *oiph,
1346                                   struct sk_buff *skb)
1347 {
1348         int err = 0;
1349
1350         if (vxlan_get_sk_family(vs) == AF_INET)
1351                 err = IP_ECN_decapsulate(oiph, skb);
1352 #if IS_ENABLED(CONFIG_IPV6)
1353         else
1354                 err = IP6_ECN_decapsulate(oiph, skb);
1355 #endif
1356
1357         if (unlikely(err) && log_ecn_error) {
1358                 if (vxlan_get_sk_family(vs) == AF_INET)
1359                         net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1360                                              &((struct iphdr *)oiph)->saddr,
1361                                              ((struct iphdr *)oiph)->tos);
1362                 else
1363                         net_info_ratelimited("non-ECT from %pI6\n",
1364                                              &((struct ipv6hdr *)oiph)->saddr);
1365         }
1366         return err <= 1;
1367 }
1368
1369 /* Callback from net/ipv4/udp.c to receive packets */
1370 static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
1371 {
1372         struct pcpu_sw_netstats *stats;
1373         struct vxlan_dev *vxlan;
1374         struct vxlan_sock *vs;
1375         struct vxlanhdr unparsed;
1376         struct vxlan_metadata _md;
1377         struct vxlan_metadata *md = &_md;
1378         __be16 protocol = htons(ETH_P_TEB);
1379         bool raw_proto = false;
1380         void *oiph;
1381         __be32 vni = 0;
1382
1383         /* Need UDP and VXLAN header to be present */
1384         if (!pskb_may_pull(skb, VXLAN_HLEN))
1385                 goto drop;
1386
1387         unparsed = *vxlan_hdr(skb);
1388         /* VNI flag always required to be set */
1389         if (!(unparsed.vx_flags & VXLAN_HF_VNI)) {
1390                 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1391                            ntohl(vxlan_hdr(skb)->vx_flags),
1392                            ntohl(vxlan_hdr(skb)->vx_vni));
1393                 /* Return non vxlan pkt */
1394                 goto drop;
1395         }
1396         unparsed.vx_flags &= ~VXLAN_HF_VNI;
1397         unparsed.vx_vni &= ~VXLAN_VNI_MASK;
1398
1399         vs = rcu_dereference_sk_user_data(sk);
1400         if (!vs)
1401                 goto drop;
1402
1403         vni = vxlan_vni(vxlan_hdr(skb)->vx_vni);
1404
1405         vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni);
1406         if (!vxlan)
1407                 goto drop;
1408
1409         /* For backwards compatibility, only allow reserved fields to be
1410          * used by VXLAN extensions if explicitly requested.
1411          */
1412         if (vs->flags & VXLAN_F_GPE) {
1413                 if (!vxlan_parse_gpe_proto(&unparsed, &protocol))
1414                         goto drop;
1415                 unparsed.vx_flags &= ~VXLAN_GPE_USED_BITS;
1416                 raw_proto = true;
1417         }
1418
1419         if (__iptunnel_pull_header(skb, VXLAN_HLEN, protocol, raw_proto,
1420                                    !net_eq(vxlan->net, dev_net(vxlan->dev))))
1421                         goto drop;
1422
1423         if (vxlan_collect_metadata(vs)) {
1424                 struct metadata_dst *tun_dst;
1425
1426                 tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), TUNNEL_KEY,
1427                                          key32_to_tunnel_id(vni), sizeof(*md));
1428
1429                 if (!tun_dst)
1430                         goto drop;
1431
1432                 md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
1433
1434                 skb_dst_set(skb, (struct dst_entry *)tun_dst);
1435         } else {
1436                 memset(md, 0, sizeof(*md));
1437         }
1438
1439         if (vs->flags & VXLAN_F_REMCSUM_RX)
1440                 if (!vxlan_remcsum(&unparsed, skb, vs->flags))
1441                         goto drop;
1442         if (vs->flags & VXLAN_F_GBP)
1443                 vxlan_parse_gbp_hdr(&unparsed, skb, vs->flags, md);
1444         /* Note that GBP and GPE can never be active together. This is
1445          * ensured in vxlan_dev_configure.
1446          */
1447
1448         if (unparsed.vx_flags || unparsed.vx_vni) {
1449                 /* If there are any unprocessed flags remaining treat
1450                  * this as a malformed packet. This behavior diverges from
1451                  * VXLAN RFC (RFC7348) which stipulates that bits in reserved
1452                  * in reserved fields are to be ignored. The approach here
1453                  * maintains compatibility with previous stack code, and also
1454                  * is more robust and provides a little more security in
1455                  * adding extensions to VXLAN.
1456                  */
1457                 goto drop;
1458         }
1459
1460         if (!raw_proto) {
1461                 if (!vxlan_set_mac(vxlan, vs, skb, vni))
1462                         goto drop;
1463         } else {
1464                 skb_reset_mac_header(skb);
1465                 skb->dev = vxlan->dev;
1466                 skb->pkt_type = PACKET_HOST;
1467         }
1468
1469         oiph = skb_network_header(skb);
1470         skb_reset_network_header(skb);
1471
1472         if (!vxlan_ecn_decapsulate(vs, oiph, skb)) {
1473                 ++vxlan->dev->stats.rx_frame_errors;
1474                 ++vxlan->dev->stats.rx_errors;
1475                 goto drop;
1476         }
1477
1478         rcu_read_lock();
1479
1480         if (unlikely(!(vxlan->dev->flags & IFF_UP))) {
1481                 rcu_read_unlock();
1482                 atomic_long_inc(&vxlan->dev->rx_dropped);
1483                 goto drop;
1484         }
1485
1486         stats = this_cpu_ptr(vxlan->dev->tstats);
1487         u64_stats_update_begin(&stats->syncp);
1488         stats->rx_packets++;
1489         stats->rx_bytes += skb->len;
1490         u64_stats_update_end(&stats->syncp);
1491
1492         gro_cells_receive(&vxlan->gro_cells, skb);
1493
1494         rcu_read_unlock();
1495
1496         return 0;
1497
1498 drop:
1499         /* Consume bad packet */
1500         kfree_skb(skb);
1501         return 0;
1502 }
1503
1504 static int arp_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
1505 {
1506         struct vxlan_dev *vxlan = netdev_priv(dev);
1507         struct arphdr *parp;
1508         u8 *arpptr, *sha;
1509         __be32 sip, tip;
1510         struct neighbour *n;
1511
1512         if (dev->flags & IFF_NOARP)
1513                 goto out;
1514
1515         if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1516                 dev->stats.tx_dropped++;
1517                 goto out;
1518         }
1519         parp = arp_hdr(skb);
1520
1521         if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1522              parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1523             parp->ar_pro != htons(ETH_P_IP) ||
1524             parp->ar_op != htons(ARPOP_REQUEST) ||
1525             parp->ar_hln != dev->addr_len ||
1526             parp->ar_pln != 4)
1527                 goto out;
1528         arpptr = (u8 *)parp + sizeof(struct arphdr);
1529         sha = arpptr;
1530         arpptr += dev->addr_len;        /* sha */
1531         memcpy(&sip, arpptr, sizeof(sip));
1532         arpptr += sizeof(sip);
1533         arpptr += dev->addr_len;        /* tha */
1534         memcpy(&tip, arpptr, sizeof(tip));
1535
1536         if (ipv4_is_loopback(tip) ||
1537             ipv4_is_multicast(tip))
1538                 goto out;
1539
1540         n = neigh_lookup(&arp_tbl, &tip, dev);
1541
1542         if (n) {
1543                 struct vxlan_fdb *f;
1544                 struct sk_buff  *reply;
1545
1546                 if (!(n->nud_state & NUD_CONNECTED)) {
1547                         neigh_release(n);
1548                         goto out;
1549                 }
1550
1551                 f = vxlan_find_mac(vxlan, n->ha, vni);
1552                 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1553                         /* bridge-local neighbor */
1554                         neigh_release(n);
1555                         goto out;
1556                 }
1557
1558                 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1559                                 n->ha, sha);
1560
1561                 neigh_release(n);
1562
1563                 if (reply == NULL)
1564                         goto out;
1565
1566                 skb_reset_mac_header(reply);
1567                 __skb_pull(reply, skb_network_offset(reply));
1568                 reply->ip_summed = CHECKSUM_UNNECESSARY;
1569                 reply->pkt_type = PACKET_HOST;
1570
1571                 if (netif_rx_ni(reply) == NET_RX_DROP)
1572                         dev->stats.rx_dropped++;
1573         } else if (vxlan->cfg.flags & VXLAN_F_L3MISS) {
1574                 union vxlan_addr ipa = {
1575                         .sin.sin_addr.s_addr = tip,
1576                         .sin.sin_family = AF_INET,
1577                 };
1578
1579                 vxlan_ip_miss(dev, &ipa);
1580         }
1581 out:
1582         consume_skb(skb);
1583         return NETDEV_TX_OK;
1584 }
1585
1586 #if IS_ENABLED(CONFIG_IPV6)
1587 static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1588         struct neighbour *n, bool isrouter)
1589 {
1590         struct net_device *dev = request->dev;
1591         struct sk_buff *reply;
1592         struct nd_msg *ns, *na;
1593         struct ipv6hdr *pip6;
1594         u8 *daddr;
1595         int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1596         int ns_olen;
1597         int i, len;
1598
1599         if (dev == NULL || !pskb_may_pull(request, request->len))
1600                 return NULL;
1601
1602         len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1603                 sizeof(*na) + na_olen + dev->needed_tailroom;
1604         reply = alloc_skb(len, GFP_ATOMIC);
1605         if (reply == NULL)
1606                 return NULL;
1607
1608         reply->protocol = htons(ETH_P_IPV6);
1609         reply->dev = dev;
1610         skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1611         skb_push(reply, sizeof(struct ethhdr));
1612         skb_reset_mac_header(reply);
1613
1614         ns = (struct nd_msg *)(ipv6_hdr(request) + 1);
1615
1616         daddr = eth_hdr(request)->h_source;
1617         ns_olen = request->len - skb_network_offset(request) -
1618                 sizeof(struct ipv6hdr) - sizeof(*ns);
1619         for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1620                 if (!ns->opt[i + 1]) {
1621                         kfree_skb(reply);
1622                         return NULL;
1623                 }
1624                 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1625                         daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1626                         break;
1627                 }
1628         }
1629
1630         /* Ethernet header */
1631         ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1632         ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1633         eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1634         reply->protocol = htons(ETH_P_IPV6);
1635
1636         skb_pull(reply, sizeof(struct ethhdr));
1637         skb_reset_network_header(reply);
1638         skb_put(reply, sizeof(struct ipv6hdr));
1639
1640         /* IPv6 header */
1641
1642         pip6 = ipv6_hdr(reply);
1643         memset(pip6, 0, sizeof(struct ipv6hdr));
1644         pip6->version = 6;
1645         pip6->priority = ipv6_hdr(request)->priority;
1646         pip6->nexthdr = IPPROTO_ICMPV6;
1647         pip6->hop_limit = 255;
1648         pip6->daddr = ipv6_hdr(request)->saddr;
1649         pip6->saddr = *(struct in6_addr *)n->primary_key;
1650
1651         skb_pull(reply, sizeof(struct ipv6hdr));
1652         skb_reset_transport_header(reply);
1653
1654         /* Neighbor Advertisement */
1655         na = skb_put_zero(reply, sizeof(*na) + na_olen);
1656         na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1657         na->icmph.icmp6_router = isrouter;
1658         na->icmph.icmp6_override = 1;
1659         na->icmph.icmp6_solicited = 1;
1660         na->target = ns->target;
1661         ether_addr_copy(&na->opt[2], n->ha);
1662         na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1663         na->opt[1] = na_olen >> 3;
1664
1665         na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1666                 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1667                 csum_partial(na, sizeof(*na)+na_olen, 0));
1668
1669         pip6->payload_len = htons(sizeof(*na)+na_olen);
1670
1671         skb_push(reply, sizeof(struct ipv6hdr));
1672
1673         reply->ip_summed = CHECKSUM_UNNECESSARY;
1674
1675         return reply;
1676 }
1677
1678 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
1679 {
1680         struct vxlan_dev *vxlan = netdev_priv(dev);
1681         const struct in6_addr *daddr;
1682         const struct ipv6hdr *iphdr;
1683         struct inet6_dev *in6_dev;
1684         struct neighbour *n;
1685         struct nd_msg *msg;
1686
1687         rcu_read_lock();
1688         in6_dev = __in6_dev_get(dev);
1689         if (!in6_dev)
1690                 goto out;
1691
1692         iphdr = ipv6_hdr(skb);
1693         daddr = &iphdr->daddr;
1694         msg = (struct nd_msg *)(iphdr + 1);
1695
1696         if (ipv6_addr_loopback(daddr) ||
1697             ipv6_addr_is_multicast(&msg->target))
1698                 goto out;
1699
1700         n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
1701
1702         if (n) {
1703                 struct vxlan_fdb *f;
1704                 struct sk_buff *reply;
1705
1706                 if (!(n->nud_state & NUD_CONNECTED)) {
1707                         neigh_release(n);
1708                         goto out;
1709                 }
1710
1711                 f = vxlan_find_mac(vxlan, n->ha, vni);
1712                 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1713                         /* bridge-local neighbor */
1714                         neigh_release(n);
1715                         goto out;
1716                 }
1717
1718                 reply = vxlan_na_create(skb, n,
1719                                         !!(f ? f->flags & NTF_ROUTER : 0));
1720
1721                 neigh_release(n);
1722
1723                 if (reply == NULL)
1724                         goto out;
1725
1726                 if (netif_rx_ni(reply) == NET_RX_DROP)
1727                         dev->stats.rx_dropped++;
1728
1729         } else if (vxlan->cfg.flags & VXLAN_F_L3MISS) {
1730                 union vxlan_addr ipa = {
1731                         .sin6.sin6_addr = msg->target,
1732                         .sin6.sin6_family = AF_INET6,
1733                 };
1734
1735                 vxlan_ip_miss(dev, &ipa);
1736         }
1737
1738 out:
1739         rcu_read_unlock();
1740         consume_skb(skb);
1741         return NETDEV_TX_OK;
1742 }
1743 #endif
1744
1745 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
1746 {
1747         struct vxlan_dev *vxlan = netdev_priv(dev);
1748         struct neighbour *n;
1749
1750         if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
1751                 return false;
1752
1753         n = NULL;
1754         switch (ntohs(eth_hdr(skb)->h_proto)) {
1755         case ETH_P_IP:
1756         {
1757                 struct iphdr *pip;
1758
1759                 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1760                         return false;
1761                 pip = ip_hdr(skb);
1762                 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
1763                 if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) {
1764                         union vxlan_addr ipa = {
1765                                 .sin.sin_addr.s_addr = pip->daddr,
1766                                 .sin.sin_family = AF_INET,
1767                         };
1768
1769                         vxlan_ip_miss(dev, &ipa);
1770                         return false;
1771                 }
1772
1773                 break;
1774         }
1775 #if IS_ENABLED(CONFIG_IPV6)
1776         case ETH_P_IPV6:
1777         {
1778                 struct ipv6hdr *pip6;
1779
1780                 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
1781                         return false;
1782                 pip6 = ipv6_hdr(skb);
1783                 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
1784                 if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) {
1785                         union vxlan_addr ipa = {
1786                                 .sin6.sin6_addr = pip6->daddr,
1787                                 .sin6.sin6_family = AF_INET6,
1788                         };
1789
1790                         vxlan_ip_miss(dev, &ipa);
1791                         return false;
1792                 }
1793
1794                 break;
1795         }
1796 #endif
1797         default:
1798                 return false;
1799         }
1800
1801         if (n) {
1802                 bool diff;
1803
1804                 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
1805                 if (diff) {
1806                         memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
1807                                 dev->addr_len);
1808                         memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
1809                 }
1810                 neigh_release(n);
1811                 return diff;
1812         }
1813
1814         return false;
1815 }
1816
1817 static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
1818                                 struct vxlan_metadata *md)
1819 {
1820         struct vxlanhdr_gbp *gbp;
1821
1822         if (!md->gbp)
1823                 return;
1824
1825         gbp = (struct vxlanhdr_gbp *)vxh;
1826         vxh->vx_flags |= VXLAN_HF_GBP;
1827
1828         if (md->gbp & VXLAN_GBP_DONT_LEARN)
1829                 gbp->dont_learn = 1;
1830
1831         if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
1832                 gbp->policy_applied = 1;
1833
1834         gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
1835 }
1836
1837 static int vxlan_build_gpe_hdr(struct vxlanhdr *vxh, u32 vxflags,
1838                                __be16 protocol)
1839 {
1840         struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)vxh;
1841
1842         gpe->np_applied = 1;
1843         gpe->next_protocol = tun_p_from_eth_p(protocol);
1844         if (!gpe->next_protocol)
1845                 return -EPFNOSUPPORT;
1846         return 0;
1847 }
1848
1849 static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst,
1850                            int iphdr_len, __be32 vni,
1851                            struct vxlan_metadata *md, u32 vxflags,
1852                            bool udp_sum)
1853 {
1854         struct vxlanhdr *vxh;
1855         int min_headroom;
1856         int err;
1857         int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1858         __be16 inner_protocol = htons(ETH_P_TEB);
1859
1860         if ((vxflags & VXLAN_F_REMCSUM_TX) &&
1861             skb->ip_summed == CHECKSUM_PARTIAL) {
1862                 int csum_start = skb_checksum_start_offset(skb);
1863
1864                 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1865                     !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1866                     (skb->csum_offset == offsetof(struct udphdr, check) ||
1867                      skb->csum_offset == offsetof(struct tcphdr, check)))
1868                         type |= SKB_GSO_TUNNEL_REMCSUM;
1869         }
1870
1871         min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
1872                         + VXLAN_HLEN + iphdr_len;
1873
1874         /* Need space for new headers (invalidates iph ptr) */
1875         err = skb_cow_head(skb, min_headroom);
1876         if (unlikely(err))
1877                 return err;
1878
1879         err = iptunnel_handle_offloads(skb, type);
1880         if (err)
1881                 return err;
1882
1883         vxh = __skb_push(skb, sizeof(*vxh));
1884         vxh->vx_flags = VXLAN_HF_VNI;
1885         vxh->vx_vni = vxlan_vni_field(vni);
1886
1887         if (type & SKB_GSO_TUNNEL_REMCSUM) {
1888                 unsigned int start;
1889
1890                 start = skb_checksum_start_offset(skb) - sizeof(struct vxlanhdr);
1891                 vxh->vx_vni |= vxlan_compute_rco(start, skb->csum_offset);
1892                 vxh->vx_flags |= VXLAN_HF_RCO;
1893
1894                 if (!skb_is_gso(skb)) {
1895                         skb->ip_summed = CHECKSUM_NONE;
1896                         skb->encapsulation = 0;
1897                 }
1898         }
1899
1900         if (vxflags & VXLAN_F_GBP)
1901                 vxlan_build_gbp_hdr(vxh, vxflags, md);
1902         if (vxflags & VXLAN_F_GPE) {
1903                 err = vxlan_build_gpe_hdr(vxh, vxflags, skb->protocol);
1904                 if (err < 0)
1905                         return err;
1906                 inner_protocol = skb->protocol;
1907         }
1908
1909         skb_set_inner_protocol(skb, inner_protocol);
1910         return 0;
1911 }
1912
1913 static struct rtable *vxlan_get_route(struct vxlan_dev *vxlan, struct net_device *dev,
1914                                       struct vxlan_sock *sock4,
1915                                       struct sk_buff *skb, int oif, u8 tos,
1916                                       __be32 daddr, __be32 *saddr, __be16 dport, __be16 sport,
1917                                       struct dst_cache *dst_cache,
1918                                       const struct ip_tunnel_info *info)
1919 {
1920         bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
1921         struct rtable *rt = NULL;
1922         struct flowi4 fl4;
1923
1924         if (!sock4)
1925                 return ERR_PTR(-EIO);
1926
1927         if (tos && !info)
1928                 use_cache = false;
1929         if (use_cache) {
1930                 rt = dst_cache_get_ip4(dst_cache, saddr);
1931                 if (rt)
1932                         return rt;
1933         }
1934
1935         memset(&fl4, 0, sizeof(fl4));
1936         fl4.flowi4_oif = oif;
1937         fl4.flowi4_tos = RT_TOS(tos);
1938         fl4.flowi4_mark = skb->mark;
1939         fl4.flowi4_proto = IPPROTO_UDP;
1940         fl4.daddr = daddr;
1941         fl4.saddr = *saddr;
1942         fl4.fl4_dport = dport;
1943         fl4.fl4_sport = sport;
1944
1945         rt = ip_route_output_key(vxlan->net, &fl4);
1946         if (likely(!IS_ERR(rt))) {
1947                 if (rt->dst.dev == dev) {
1948                         netdev_dbg(dev, "circular route to %pI4\n", &daddr);
1949                         ip_rt_put(rt);
1950                         return ERR_PTR(-ELOOP);
1951                 }
1952
1953                 *saddr = fl4.saddr;
1954                 if (use_cache)
1955                         dst_cache_set_ip4(dst_cache, &rt->dst, fl4.saddr);
1956         } else {
1957                 netdev_dbg(dev, "no route to %pI4\n", &daddr);
1958                 return ERR_PTR(-ENETUNREACH);
1959         }
1960         return rt;
1961 }
1962
1963 #if IS_ENABLED(CONFIG_IPV6)
1964 static struct dst_entry *vxlan6_get_route(struct vxlan_dev *vxlan,
1965                                           struct net_device *dev,
1966                                           struct vxlan_sock *sock6,
1967                                           struct sk_buff *skb, int oif, u8 tos,
1968                                           __be32 label,
1969                                           const struct in6_addr *daddr,
1970                                           struct in6_addr *saddr,
1971                                           __be16 dport, __be16 sport,
1972                                           struct dst_cache *dst_cache,
1973                                           const struct ip_tunnel_info *info)
1974 {
1975         bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
1976         struct dst_entry *ndst;
1977         struct flowi6 fl6;
1978
1979         if (!sock6)
1980                 return ERR_PTR(-EIO);
1981
1982         if (tos && !info)
1983                 use_cache = false;
1984         if (use_cache) {
1985                 ndst = dst_cache_get_ip6(dst_cache, saddr);
1986                 if (ndst)
1987                         return ndst;
1988         }
1989
1990         memset(&fl6, 0, sizeof(fl6));
1991         fl6.flowi6_oif = oif;
1992         fl6.daddr = *daddr;
1993         fl6.saddr = *saddr;
1994         fl6.flowlabel = ip6_make_flowinfo(RT_TOS(tos), label);
1995         fl6.flowi6_mark = skb->mark;
1996         fl6.flowi6_proto = IPPROTO_UDP;
1997         fl6.fl6_dport = dport;
1998         fl6.fl6_sport = sport;
1999
2000         ndst = ipv6_stub->ipv6_dst_lookup_flow(vxlan->net, sock6->sock->sk,
2001                                                &fl6, NULL);
2002         if (unlikely(IS_ERR(ndst))) {
2003                 netdev_dbg(dev, "no route to %pI6\n", daddr);
2004                 return ERR_PTR(-ENETUNREACH);
2005         }
2006
2007         if (unlikely(ndst->dev == dev)) {
2008                 netdev_dbg(dev, "circular route to %pI6\n", daddr);
2009                 dst_release(ndst);
2010                 return ERR_PTR(-ELOOP);
2011         }
2012
2013         *saddr = fl6.saddr;
2014         if (use_cache)
2015                 dst_cache_set_ip6(dst_cache, ndst, saddr);
2016         return ndst;
2017 }
2018 #endif
2019
2020 /* Bypass encapsulation if the destination is local */
2021 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
2022                                struct vxlan_dev *dst_vxlan, __be32 vni)
2023 {
2024         struct pcpu_sw_netstats *tx_stats, *rx_stats;
2025         union vxlan_addr loopback;
2026         union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
2027         struct net_device *dev;
2028         int len = skb->len;
2029
2030         tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
2031         rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
2032         skb->pkt_type = PACKET_HOST;
2033         skb->encapsulation = 0;
2034         skb->dev = dst_vxlan->dev;
2035         __skb_pull(skb, skb_network_offset(skb));
2036
2037         if (remote_ip->sa.sa_family == AF_INET) {
2038                 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
2039                 loopback.sa.sa_family =  AF_INET;
2040 #if IS_ENABLED(CONFIG_IPV6)
2041         } else {
2042                 loopback.sin6.sin6_addr = in6addr_loopback;
2043                 loopback.sa.sa_family =  AF_INET6;
2044 #endif
2045         }
2046
2047         rcu_read_lock();
2048         dev = skb->dev;
2049         if (unlikely(!(dev->flags & IFF_UP))) {
2050                 kfree_skb(skb);
2051                 goto drop;
2052         }
2053
2054         if (dst_vxlan->cfg.flags & VXLAN_F_LEARN)
2055                 vxlan_snoop(dev, &loopback, eth_hdr(skb)->h_source, 0, vni);
2056
2057         u64_stats_update_begin(&tx_stats->syncp);
2058         tx_stats->tx_packets++;
2059         tx_stats->tx_bytes += len;
2060         u64_stats_update_end(&tx_stats->syncp);
2061
2062         if (netif_rx(skb) == NET_RX_SUCCESS) {
2063                 u64_stats_update_begin(&rx_stats->syncp);
2064                 rx_stats->rx_packets++;
2065                 rx_stats->rx_bytes += len;
2066                 u64_stats_update_end(&rx_stats->syncp);
2067         } else {
2068 drop:
2069                 dev->stats.rx_dropped++;
2070         }
2071         rcu_read_unlock();
2072 }
2073
2074 static int encap_bypass_if_local(struct sk_buff *skb, struct net_device *dev,
2075                                  struct vxlan_dev *vxlan,
2076                                  union vxlan_addr *daddr,
2077                                  __be16 dst_port, int dst_ifindex, __be32 vni,
2078                                  struct dst_entry *dst,
2079                                  u32 rt_flags)
2080 {
2081 #if IS_ENABLED(CONFIG_IPV6)
2082         /* IPv6 rt-flags are checked against RTF_LOCAL, but the value of
2083          * RTF_LOCAL is equal to RTCF_LOCAL. So to keep code simple
2084          * we can use RTCF_LOCAL which works for ipv4 and ipv6 route entry.
2085          */
2086         BUILD_BUG_ON(RTCF_LOCAL != RTF_LOCAL);
2087 #endif
2088         /* Bypass encapsulation if the destination is local */
2089         if (rt_flags & RTCF_LOCAL &&
2090             !(rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2091                 struct vxlan_dev *dst_vxlan;
2092
2093                 dst_release(dst);
2094                 dst_vxlan = vxlan_find_vni(vxlan->net, dst_ifindex, vni,
2095                                            daddr->sa.sa_family, dst_port,
2096                                            vxlan->cfg.flags);
2097                 if (!dst_vxlan) {
2098                         dev->stats.tx_errors++;
2099                         kfree_skb(skb);
2100
2101                         return -ENOENT;
2102                 }
2103                 vxlan_encap_bypass(skb, vxlan, dst_vxlan, vni);
2104                 return 1;
2105         }
2106
2107         return 0;
2108 }
2109
2110 static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
2111                            __be32 default_vni, struct vxlan_rdst *rdst,
2112                            bool did_rsc)
2113 {
2114         struct dst_cache *dst_cache;
2115         struct ip_tunnel_info *info;
2116         struct vxlan_dev *vxlan = netdev_priv(dev);
2117         const struct iphdr *old_iph = ip_hdr(skb);
2118         union vxlan_addr *dst;
2119         union vxlan_addr remote_ip, local_ip;
2120         struct vxlan_metadata _md;
2121         struct vxlan_metadata *md = &_md;
2122         __be16 src_port = 0, dst_port;
2123         struct dst_entry *ndst = NULL;
2124         __be32 vni, label;
2125         __u8 tos, ttl;
2126         int ifindex;
2127         int err;
2128         u32 flags = vxlan->cfg.flags;
2129         bool udp_sum = false;
2130         bool xnet = !net_eq(vxlan->net, dev_net(vxlan->dev));
2131
2132         info = skb_tunnel_info(skb);
2133
2134         if (rdst) {
2135                 dst = &rdst->remote_ip;
2136                 if (vxlan_addr_any(dst)) {
2137                         if (did_rsc) {
2138                                 /* short-circuited back to local bridge */
2139                                 vxlan_encap_bypass(skb, vxlan, vxlan, default_vni);
2140                                 return;
2141                         }
2142                         goto drop;
2143                 }
2144
2145                 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port;
2146                 vni = (rdst->remote_vni) ? : default_vni;
2147                 ifindex = rdst->remote_ifindex;
2148                 local_ip = vxlan->cfg.saddr;
2149                 dst_cache = &rdst->dst_cache;
2150                 md->gbp = skb->mark;
2151                 if (flags & VXLAN_F_TTL_INHERIT) {
2152                         ttl = ip_tunnel_get_ttl(old_iph, skb);
2153                 } else {
2154                         ttl = vxlan->cfg.ttl;
2155                         if (!ttl && vxlan_addr_multicast(dst))
2156                                 ttl = 1;
2157                 }
2158
2159                 tos = vxlan->cfg.tos;
2160                 if (tos == 1)
2161                         tos = ip_tunnel_get_dsfield(old_iph, skb);
2162
2163                 if (dst->sa.sa_family == AF_INET)
2164                         udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM_TX);
2165                 else
2166                         udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX);
2167                 label = vxlan->cfg.label;
2168         } else {
2169                 if (!info) {
2170                         WARN_ONCE(1, "%s: Missing encapsulation instructions\n",
2171                                   dev->name);
2172                         goto drop;
2173                 }
2174                 remote_ip.sa.sa_family = ip_tunnel_info_af(info);
2175                 if (remote_ip.sa.sa_family == AF_INET) {
2176                         remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst;
2177                         local_ip.sin.sin_addr.s_addr = info->key.u.ipv4.src;
2178                 } else {
2179                         remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst;
2180                         local_ip.sin6.sin6_addr = info->key.u.ipv6.src;
2181                 }
2182                 dst = &remote_ip;
2183                 dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port;
2184                 vni = tunnel_id_to_key32(info->key.tun_id);
2185                 ifindex = 0;
2186                 dst_cache = &info->dst_cache;
2187                 if (info->key.tun_flags & TUNNEL_VXLAN_OPT) {
2188                         if (info->options_len < sizeof(*md))
2189                                 goto drop;
2190                         md = ip_tunnel_info_opts(info);
2191                 }
2192                 ttl = info->key.ttl;
2193                 tos = info->key.tos;
2194                 label = info->key.label;
2195                 udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
2196         }
2197         src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2198                                      vxlan->cfg.port_max, true);
2199
2200         rcu_read_lock();
2201         if (dst->sa.sa_family == AF_INET) {
2202                 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
2203                 struct rtable *rt;
2204                 __be16 df = 0;
2205
2206                 rt = vxlan_get_route(vxlan, dev, sock4, skb, ifindex, tos,
2207                                      dst->sin.sin_addr.s_addr,
2208                                      &local_ip.sin.sin_addr.s_addr,
2209                                      dst_port, src_port,
2210                                      dst_cache, info);
2211                 if (IS_ERR(rt)) {
2212                         err = PTR_ERR(rt);
2213                         goto tx_error;
2214                 }
2215
2216                 /* Bypass encapsulation if the destination is local */
2217                 if (!info) {
2218                         err = encap_bypass_if_local(skb, dev, vxlan, dst,
2219                                                     dst_port, ifindex, vni,
2220                                                     &rt->dst, rt->rt_flags);
2221                         if (err)
2222                                 goto out_unlock;
2223                 } else if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT) {
2224                         df = htons(IP_DF);
2225                 }
2226
2227                 ndst = &rt->dst;
2228                 skb_tunnel_check_pmtu(skb, ndst, VXLAN_HEADROOM);
2229
2230                 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2231                 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
2232                 err = vxlan_build_skb(skb, ndst, sizeof(struct iphdr),
2233                                       vni, md, flags, udp_sum);
2234                 if (err < 0)
2235                         goto tx_error;
2236
2237                 udp_tunnel_xmit_skb(rt, sock4->sock->sk, skb, local_ip.sin.sin_addr.s_addr,
2238                                     dst->sin.sin_addr.s_addr, tos, ttl, df,
2239                                     src_port, dst_port, xnet, !udp_sum);
2240 #if IS_ENABLED(CONFIG_IPV6)
2241         } else {
2242                 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
2243
2244                 ndst = vxlan6_get_route(vxlan, dev, sock6, skb, ifindex, tos,
2245                                         label, &dst->sin6.sin6_addr,
2246                                         &local_ip.sin6.sin6_addr,
2247                                         dst_port, src_port,
2248                                         dst_cache, info);
2249                 if (IS_ERR(ndst)) {
2250                         err = PTR_ERR(ndst);
2251                         ndst = NULL;
2252                         goto tx_error;
2253                 }
2254
2255                 if (!info) {
2256                         u32 rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags;
2257
2258                         err = encap_bypass_if_local(skb, dev, vxlan, dst,
2259                                                     dst_port, ifindex, vni,
2260                                                     ndst, rt6i_flags);
2261                         if (err)
2262                                 goto out_unlock;
2263                 }
2264
2265                 skb_tunnel_check_pmtu(skb, ndst, VXLAN6_HEADROOM);
2266
2267                 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2268                 ttl = ttl ? : ip6_dst_hoplimit(ndst);
2269                 skb_scrub_packet(skb, xnet);
2270                 err = vxlan_build_skb(skb, ndst, sizeof(struct ipv6hdr),
2271                                       vni, md, flags, udp_sum);
2272                 if (err < 0)
2273                         goto tx_error;
2274
2275                 udp_tunnel6_xmit_skb(ndst, sock6->sock->sk, skb, dev,
2276                                      &local_ip.sin6.sin6_addr,
2277                                      &dst->sin6.sin6_addr, tos, ttl,
2278                                      label, src_port, dst_port, !udp_sum);
2279 #endif
2280         }
2281 out_unlock:
2282         rcu_read_unlock();
2283         return;
2284
2285 drop:
2286         dev->stats.tx_dropped++;
2287         dev_kfree_skb(skb);
2288         return;
2289
2290 tx_error:
2291         rcu_read_unlock();
2292         if (err == -ELOOP)
2293                 dev->stats.collisions++;
2294         else if (err == -ENETUNREACH)
2295                 dev->stats.tx_carrier_errors++;
2296         dst_release(ndst);
2297         dev->stats.tx_errors++;
2298         kfree_skb(skb);
2299 }
2300
2301 /* Transmit local packets over Vxlan
2302  *
2303  * Outer IP header inherits ECN and DF from inner header.
2304  * Outer UDP destination is the VXLAN assigned port.
2305  *           source port is based on hash of flow
2306  */
2307 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
2308 {
2309         struct vxlan_dev *vxlan = netdev_priv(dev);
2310         struct vxlan_rdst *rdst, *fdst = NULL;
2311         const struct ip_tunnel_info *info;
2312         bool did_rsc = false;
2313         struct vxlan_fdb *f;
2314         struct ethhdr *eth;
2315         __be32 vni = 0;
2316
2317         info = skb_tunnel_info(skb);
2318
2319         skb_reset_mac_header(skb);
2320
2321         if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) {
2322                 if (info && info->mode & IP_TUNNEL_INFO_BRIDGE &&
2323                     info->mode & IP_TUNNEL_INFO_TX) {
2324                         vni = tunnel_id_to_key32(info->key.tun_id);
2325                 } else {
2326                         if (info && info->mode & IP_TUNNEL_INFO_TX)
2327                                 vxlan_xmit_one(skb, dev, vni, NULL, false);
2328                         else
2329                                 kfree_skb(skb);
2330                         return NETDEV_TX_OK;
2331                 }
2332         }
2333
2334         if (vxlan->cfg.flags & VXLAN_F_PROXY) {
2335                 eth = eth_hdr(skb);
2336                 if (ntohs(eth->h_proto) == ETH_P_ARP)
2337                         return arp_reduce(dev, skb, vni);
2338 #if IS_ENABLED(CONFIG_IPV6)
2339                 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
2340                          pskb_may_pull(skb, sizeof(struct ipv6hdr) +
2341                                             sizeof(struct nd_msg)) &&
2342                          ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
2343                         struct nd_msg *m = (struct nd_msg *)(ipv6_hdr(skb) + 1);
2344
2345                         if (m->icmph.icmp6_code == 0 &&
2346                             m->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
2347                                 return neigh_reduce(dev, skb, vni);
2348                 }
2349 #endif
2350         }
2351
2352         eth = eth_hdr(skb);
2353         f = vxlan_find_mac(vxlan, eth->h_dest, vni);
2354         did_rsc = false;
2355
2356         if (f && (f->flags & NTF_ROUTER) && (vxlan->cfg.flags & VXLAN_F_RSC) &&
2357             (ntohs(eth->h_proto) == ETH_P_IP ||
2358              ntohs(eth->h_proto) == ETH_P_IPV6)) {
2359                 did_rsc = route_shortcircuit(dev, skb);
2360                 if (did_rsc)
2361                         f = vxlan_find_mac(vxlan, eth->h_dest, vni);
2362         }
2363
2364         if (f == NULL) {
2365                 f = vxlan_find_mac(vxlan, all_zeros_mac, vni);
2366                 if (f == NULL) {
2367                         if ((vxlan->cfg.flags & VXLAN_F_L2MISS) &&
2368                             !is_multicast_ether_addr(eth->h_dest))
2369                                 vxlan_fdb_miss(vxlan, eth->h_dest);
2370
2371                         dev->stats.tx_dropped++;
2372                         kfree_skb(skb);
2373                         return NETDEV_TX_OK;
2374                 }
2375         }
2376
2377         list_for_each_entry_rcu(rdst, &f->remotes, list) {
2378                 struct sk_buff *skb1;
2379
2380                 if (!fdst) {
2381                         fdst = rdst;
2382                         continue;
2383                 }
2384                 skb1 = skb_clone(skb, GFP_ATOMIC);
2385                 if (skb1)
2386                         vxlan_xmit_one(skb1, dev, vni, rdst, did_rsc);
2387         }
2388
2389         if (fdst)
2390                 vxlan_xmit_one(skb, dev, vni, fdst, did_rsc);
2391         else
2392                 kfree_skb(skb);
2393         return NETDEV_TX_OK;
2394 }
2395
2396 /* Walk the forwarding table and purge stale entries */
2397 static void vxlan_cleanup(struct timer_list *t)
2398 {
2399         struct vxlan_dev *vxlan = from_timer(vxlan, t, age_timer);
2400         unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2401         unsigned int h;
2402
2403         if (!netif_running(vxlan->dev))
2404                 return;
2405
2406         for (h = 0; h < FDB_HASH_SIZE; ++h) {
2407                 struct hlist_node *p, *n;
2408
2409                 spin_lock_bh(&vxlan->hash_lock);
2410                 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2411                         struct vxlan_fdb *f
2412                                 = container_of(p, struct vxlan_fdb, hlist);
2413                         unsigned long timeout;
2414
2415                         if (f->state & (NUD_PERMANENT | NUD_NOARP))
2416                                 continue;
2417
2418                         if (f->flags & NTF_EXT_LEARNED)
2419                                 continue;
2420
2421                         timeout = f->used + vxlan->cfg.age_interval * HZ;
2422                         if (time_before_eq(timeout, jiffies)) {
2423                                 netdev_dbg(vxlan->dev,
2424                                            "garbage collect %pM\n",
2425                                            f->eth_addr);
2426                                 f->state = NUD_STALE;
2427                                 vxlan_fdb_destroy(vxlan, f, true);
2428                         } else if (time_before(timeout, next_timer))
2429                                 next_timer = timeout;
2430                 }
2431                 spin_unlock_bh(&vxlan->hash_lock);
2432         }
2433
2434         mod_timer(&vxlan->age_timer, next_timer);
2435 }
2436
2437 static void vxlan_vs_del_dev(struct vxlan_dev *vxlan)
2438 {
2439         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2440
2441         spin_lock(&vn->sock_lock);
2442         hlist_del_init_rcu(&vxlan->hlist4.hlist);
2443 #if IS_ENABLED(CONFIG_IPV6)
2444         hlist_del_init_rcu(&vxlan->hlist6.hlist);
2445 #endif
2446         spin_unlock(&vn->sock_lock);
2447 }
2448
2449 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan,
2450                              struct vxlan_dev_node *node)
2451 {
2452         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2453         __be32 vni = vxlan->default_dst.remote_vni;
2454
2455         node->vxlan = vxlan;
2456         spin_lock(&vn->sock_lock);
2457         hlist_add_head_rcu(&node->hlist, vni_head(vs, vni));
2458         spin_unlock(&vn->sock_lock);
2459 }
2460
2461 /* Setup stats when device is created */
2462 static int vxlan_init(struct net_device *dev)
2463 {
2464         struct vxlan_dev *vxlan = netdev_priv(dev);
2465         int err;
2466
2467         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2468         if (!dev->tstats)
2469                 return -ENOMEM;
2470
2471         err = gro_cells_init(&vxlan->gro_cells, dev);
2472         if (err) {
2473                 free_percpu(dev->tstats);
2474                 return err;
2475         }
2476
2477         return 0;
2478 }
2479
2480 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan, __be32 vni)
2481 {
2482         struct vxlan_fdb *f;
2483
2484         spin_lock_bh(&vxlan->hash_lock);
2485         f = __vxlan_find_mac(vxlan, all_zeros_mac, vni);
2486         if (f)
2487                 vxlan_fdb_destroy(vxlan, f, true);
2488         spin_unlock_bh(&vxlan->hash_lock);
2489 }
2490
2491 static void vxlan_uninit(struct net_device *dev)
2492 {
2493         struct vxlan_dev *vxlan = netdev_priv(dev);
2494
2495         gro_cells_destroy(&vxlan->gro_cells);
2496
2497         vxlan_fdb_delete_default(vxlan, vxlan->cfg.vni);
2498
2499         free_percpu(dev->tstats);
2500 }
2501
2502 /* Start ageing timer and join group when device is brought up */
2503 static int vxlan_open(struct net_device *dev)
2504 {
2505         struct vxlan_dev *vxlan = netdev_priv(dev);
2506         int ret;
2507
2508         ret = vxlan_sock_add(vxlan);
2509         if (ret < 0)
2510                 return ret;
2511
2512         if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
2513                 ret = vxlan_igmp_join(vxlan);
2514                 if (ret == -EADDRINUSE)
2515                         ret = 0;
2516                 if (ret) {
2517                         vxlan_sock_release(vxlan);
2518                         return ret;
2519                 }
2520         }
2521
2522         if (vxlan->cfg.age_interval)
2523                 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2524
2525         return ret;
2526 }
2527
2528 /* Purge the forwarding table */
2529 static void vxlan_flush(struct vxlan_dev *vxlan, bool do_all)
2530 {
2531         unsigned int h;
2532
2533         spin_lock_bh(&vxlan->hash_lock);
2534         for (h = 0; h < FDB_HASH_SIZE; ++h) {
2535                 struct hlist_node *p, *n;
2536                 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2537                         struct vxlan_fdb *f
2538                                 = container_of(p, struct vxlan_fdb, hlist);
2539                         if (!do_all && (f->state & (NUD_PERMANENT | NUD_NOARP)))
2540                                 continue;
2541                         /* the all_zeros_mac entry is deleted at vxlan_uninit */
2542                         if (!is_zero_ether_addr(f->eth_addr))
2543                                 vxlan_fdb_destroy(vxlan, f, true);
2544                 }
2545         }
2546         spin_unlock_bh(&vxlan->hash_lock);
2547 }
2548
2549 /* Cleanup timer and forwarding table on shutdown */
2550 static int vxlan_stop(struct net_device *dev)
2551 {
2552         struct vxlan_dev *vxlan = netdev_priv(dev);
2553         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2554         int ret = 0;
2555
2556         if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
2557             !vxlan_group_used(vn, vxlan))
2558                 ret = vxlan_igmp_leave(vxlan);
2559
2560         del_timer_sync(&vxlan->age_timer);
2561
2562         vxlan_flush(vxlan, false);
2563         vxlan_sock_release(vxlan);
2564
2565         return ret;
2566 }
2567
2568 /* Stub, nothing needs to be done. */
2569 static void vxlan_set_multicast_list(struct net_device *dev)
2570 {
2571 }
2572
2573 static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2574 {
2575         struct vxlan_dev *vxlan = netdev_priv(dev);
2576         struct vxlan_rdst *dst = &vxlan->default_dst;
2577         struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
2578                                                          dst->remote_ifindex);
2579         bool use_ipv6 = !!(vxlan->cfg.flags & VXLAN_F_IPV6);
2580
2581         /* This check is different than dev->max_mtu, because it looks at
2582          * the lowerdev->mtu, rather than the static dev->max_mtu
2583          */
2584         if (lowerdev) {
2585                 int max_mtu = lowerdev->mtu -
2586                               (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2587                 if (new_mtu > max_mtu)
2588                         return -EINVAL;
2589         }
2590
2591         dev->mtu = new_mtu;
2592         return 0;
2593 }
2594
2595 static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
2596 {
2597         struct vxlan_dev *vxlan = netdev_priv(dev);
2598         struct ip_tunnel_info *info = skb_tunnel_info(skb);
2599         __be16 sport, dport;
2600
2601         sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2602                                   vxlan->cfg.port_max, true);
2603         dport = info->key.tp_dst ? : vxlan->cfg.dst_port;
2604
2605         if (ip_tunnel_info_af(info) == AF_INET) {
2606                 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
2607                 struct rtable *rt;
2608
2609                 rt = vxlan_get_route(vxlan, dev, sock4, skb, 0, info->key.tos,
2610                                      info->key.u.ipv4.dst,
2611                                      &info->key.u.ipv4.src, dport, sport,
2612                                      &info->dst_cache, info);
2613                 if (IS_ERR(rt))
2614                         return PTR_ERR(rt);
2615                 ip_rt_put(rt);
2616         } else {
2617 #if IS_ENABLED(CONFIG_IPV6)
2618                 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
2619                 struct dst_entry *ndst;
2620
2621                 ndst = vxlan6_get_route(vxlan, dev, sock6, skb, 0, info->key.tos,
2622                                         info->key.label, &info->key.u.ipv6.dst,
2623                                         &info->key.u.ipv6.src, dport, sport,
2624                                         &info->dst_cache, info);
2625                 if (IS_ERR(ndst))
2626                         return PTR_ERR(ndst);
2627                 dst_release(ndst);
2628 #else /* !CONFIG_IPV6 */
2629                 return -EPFNOSUPPORT;
2630 #endif
2631         }
2632         info->key.tp_src = sport;
2633         info->key.tp_dst = dport;
2634         return 0;
2635 }
2636
2637 static const struct net_device_ops vxlan_netdev_ether_ops = {
2638         .ndo_init               = vxlan_init,
2639         .ndo_uninit             = vxlan_uninit,
2640         .ndo_open               = vxlan_open,
2641         .ndo_stop               = vxlan_stop,
2642         .ndo_start_xmit         = vxlan_xmit,
2643         .ndo_get_stats64        = ip_tunnel_get_stats64,
2644         .ndo_set_rx_mode        = vxlan_set_multicast_list,
2645         .ndo_change_mtu         = vxlan_change_mtu,
2646         .ndo_validate_addr      = eth_validate_addr,
2647         .ndo_set_mac_address    = eth_mac_addr,
2648         .ndo_fdb_add            = vxlan_fdb_add,
2649         .ndo_fdb_del            = vxlan_fdb_delete,
2650         .ndo_fdb_dump           = vxlan_fdb_dump,
2651         .ndo_fill_metadata_dst  = vxlan_fill_metadata_dst,
2652 };
2653
2654 static const struct net_device_ops vxlan_netdev_raw_ops = {
2655         .ndo_init               = vxlan_init,
2656         .ndo_uninit             = vxlan_uninit,
2657         .ndo_open               = vxlan_open,
2658         .ndo_stop               = vxlan_stop,
2659         .ndo_start_xmit         = vxlan_xmit,
2660         .ndo_get_stats64        = ip_tunnel_get_stats64,
2661         .ndo_change_mtu         = vxlan_change_mtu,
2662         .ndo_fill_metadata_dst  = vxlan_fill_metadata_dst,
2663 };
2664
2665 /* Info for udev, that this is a virtual tunnel endpoint */
2666 static struct device_type vxlan_type = {
2667         .name = "vxlan",
2668 };
2669
2670 /* Calls the ndo_udp_tunnel_add of the caller in order to
2671  * supply the listening VXLAN udp ports. Callers are expected
2672  * to implement the ndo_udp_tunnel_add.
2673  */
2674 static void vxlan_offload_rx_ports(struct net_device *dev, bool push)
2675 {
2676         struct vxlan_sock *vs;
2677         struct net *net = dev_net(dev);
2678         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2679         unsigned int i;
2680
2681         spin_lock(&vn->sock_lock);
2682         for (i = 0; i < PORT_HASH_SIZE; ++i) {
2683                 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
2684                         unsigned short type;
2685
2686                         if (vs->flags & VXLAN_F_GPE)
2687                                 type = UDP_TUNNEL_TYPE_VXLAN_GPE;
2688                         else
2689                                 type = UDP_TUNNEL_TYPE_VXLAN;
2690
2691                         if (push)
2692                                 udp_tunnel_push_rx_port(dev, vs->sock, type);
2693                         else
2694                                 udp_tunnel_drop_rx_port(dev, vs->sock, type);
2695                 }
2696         }
2697         spin_unlock(&vn->sock_lock);
2698 }
2699
2700 /* Initialize the device structure. */
2701 static void vxlan_setup(struct net_device *dev)
2702 {
2703         struct vxlan_dev *vxlan = netdev_priv(dev);
2704         unsigned int h;
2705
2706         eth_hw_addr_random(dev);
2707         ether_setup(dev);
2708
2709         dev->needs_free_netdev = true;
2710         SET_NETDEV_DEVTYPE(dev, &vxlan_type);
2711
2712         dev->features   |= NETIF_F_LLTX;
2713         dev->features   |= NETIF_F_SG | NETIF_F_HW_CSUM;
2714         dev->features   |= NETIF_F_RXCSUM;
2715         dev->features   |= NETIF_F_GSO_SOFTWARE;
2716
2717         dev->vlan_features = dev->features;
2718         dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
2719         dev->hw_features |= NETIF_F_GSO_SOFTWARE;
2720         netif_keep_dst(dev);
2721         dev->priv_flags |= IFF_NO_QUEUE;
2722
2723         /* MTU range: 68 - 65535 */
2724         dev->min_mtu = ETH_MIN_MTU;
2725         dev->max_mtu = ETH_MAX_MTU;
2726
2727         INIT_LIST_HEAD(&vxlan->next);
2728         spin_lock_init(&vxlan->hash_lock);
2729
2730         timer_setup(&vxlan->age_timer, vxlan_cleanup, TIMER_DEFERRABLE);
2731
2732         vxlan->dev = dev;
2733
2734         for (h = 0; h < FDB_HASH_SIZE; ++h)
2735                 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
2736 }
2737
2738 static void vxlan_ether_setup(struct net_device *dev)
2739 {
2740         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2741         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2742         dev->netdev_ops = &vxlan_netdev_ether_ops;
2743 }
2744
2745 static void vxlan_raw_setup(struct net_device *dev)
2746 {
2747         dev->header_ops = NULL;
2748         dev->type = ARPHRD_NONE;
2749         dev->hard_header_len = 0;
2750         dev->addr_len = 0;
2751         dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
2752         dev->netdev_ops = &vxlan_netdev_raw_ops;
2753 }
2754
2755 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
2756         [IFLA_VXLAN_ID]         = { .type = NLA_U32 },
2757         [IFLA_VXLAN_GROUP]      = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
2758         [IFLA_VXLAN_GROUP6]     = { .len = sizeof(struct in6_addr) },
2759         [IFLA_VXLAN_LINK]       = { .type = NLA_U32 },
2760         [IFLA_VXLAN_LOCAL]      = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
2761         [IFLA_VXLAN_LOCAL6]     = { .len = sizeof(struct in6_addr) },
2762         [IFLA_VXLAN_TOS]        = { .type = NLA_U8 },
2763         [IFLA_VXLAN_TTL]        = { .type = NLA_U8 },
2764         [IFLA_VXLAN_LABEL]      = { .type = NLA_U32 },
2765         [IFLA_VXLAN_LEARNING]   = { .type = NLA_U8 },
2766         [IFLA_VXLAN_AGEING]     = { .type = NLA_U32 },
2767         [IFLA_VXLAN_LIMIT]      = { .type = NLA_U32 },
2768         [IFLA_VXLAN_PORT_RANGE] = { .len  = sizeof(struct ifla_vxlan_port_range) },
2769         [IFLA_VXLAN_PROXY]      = { .type = NLA_U8 },
2770         [IFLA_VXLAN_RSC]        = { .type = NLA_U8 },
2771         [IFLA_VXLAN_L2MISS]     = { .type = NLA_U8 },
2772         [IFLA_VXLAN_L3MISS]     = { .type = NLA_U8 },
2773         [IFLA_VXLAN_COLLECT_METADATA]   = { .type = NLA_U8 },
2774         [IFLA_VXLAN_PORT]       = { .type = NLA_U16 },
2775         [IFLA_VXLAN_UDP_CSUM]   = { .type = NLA_U8 },
2776         [IFLA_VXLAN_UDP_ZERO_CSUM6_TX]  = { .type = NLA_U8 },
2777         [IFLA_VXLAN_UDP_ZERO_CSUM6_RX]  = { .type = NLA_U8 },
2778         [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 },
2779         [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
2780         [IFLA_VXLAN_GBP]        = { .type = NLA_FLAG, },
2781         [IFLA_VXLAN_GPE]        = { .type = NLA_FLAG, },
2782         [IFLA_VXLAN_REMCSUM_NOPARTIAL]  = { .type = NLA_FLAG },
2783         [IFLA_VXLAN_TTL_INHERIT]        = { .type = NLA_FLAG },
2784 };
2785
2786 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[],
2787                           struct netlink_ext_ack *extack)
2788 {
2789         if (tb[IFLA_ADDRESS]) {
2790                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
2791                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
2792                                             "Provided link layer address is not Ethernet");
2793                         return -EINVAL;
2794                 }
2795
2796                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
2797                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
2798                                             "Provided Ethernet address is not unicast");
2799                         return -EADDRNOTAVAIL;
2800                 }
2801         }
2802
2803         if (tb[IFLA_MTU]) {
2804                 u32 mtu = nla_get_u32(tb[IFLA_MTU]);
2805
2806                 if (mtu < ETH_MIN_MTU || mtu > ETH_MAX_MTU) {
2807                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_MTU],
2808                                             "MTU must be between 68 and 65535");
2809                         return -EINVAL;
2810                 }
2811         }
2812
2813         if (!data) {
2814                 NL_SET_ERR_MSG(extack,
2815                                "Required attributes not provided to perform the operation");
2816                 return -EINVAL;
2817         }
2818
2819         if (data[IFLA_VXLAN_ID]) {
2820                 u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
2821
2822                 if (id >= VXLAN_N_VID) {
2823                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_ID],
2824                                             "VXLAN ID must be lower than 16777216");
2825                         return -ERANGE;
2826                 }
2827         }
2828
2829         if (data[IFLA_VXLAN_PORT_RANGE]) {
2830                 const struct ifla_vxlan_port_range *p
2831                         = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2832
2833                 if (ntohs(p->high) < ntohs(p->low)) {
2834                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT_RANGE],
2835                                             "Invalid source port range");
2836                         return -EINVAL;
2837                 }
2838         }
2839
2840         return 0;
2841 }
2842
2843 static void vxlan_get_drvinfo(struct net_device *netdev,
2844                               struct ethtool_drvinfo *drvinfo)
2845 {
2846         strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
2847         strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
2848 }
2849
2850 static const struct ethtool_ops vxlan_ethtool_ops = {
2851         .get_drvinfo    = vxlan_get_drvinfo,
2852         .get_link       = ethtool_op_get_link,
2853 };
2854
2855 static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
2856                                         __be16 port, u32 flags)
2857 {
2858         struct socket *sock;
2859         struct udp_port_cfg udp_conf;
2860         int err;
2861
2862         memset(&udp_conf, 0, sizeof(udp_conf));
2863
2864         if (ipv6) {
2865                 udp_conf.family = AF_INET6;
2866                 udp_conf.use_udp6_rx_checksums =
2867                     !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
2868                 udp_conf.ipv6_v6only = 1;
2869         } else {
2870                 udp_conf.family = AF_INET;
2871         }
2872
2873         udp_conf.local_udp_port = port;
2874
2875         /* Open UDP socket */
2876         err = udp_sock_create(net, &udp_conf, &sock);
2877         if (err < 0)
2878                 return ERR_PTR(err);
2879
2880         return sock;
2881 }
2882
2883 /* Create new listen socket if needed */
2884 static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6,
2885                                               __be16 port, u32 flags)
2886 {
2887         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2888         struct vxlan_sock *vs;
2889         struct socket *sock;
2890         unsigned int h;
2891         struct udp_tunnel_sock_cfg tunnel_cfg;
2892
2893         vs = kzalloc(sizeof(*vs), GFP_KERNEL);
2894         if (!vs)
2895                 return ERR_PTR(-ENOMEM);
2896
2897         for (h = 0; h < VNI_HASH_SIZE; ++h)
2898                 INIT_HLIST_HEAD(&vs->vni_list[h]);
2899
2900         sock = vxlan_create_sock(net, ipv6, port, flags);
2901         if (IS_ERR(sock)) {
2902                 kfree(vs);
2903                 return ERR_CAST(sock);
2904         }
2905
2906         vs->sock = sock;
2907         refcount_set(&vs->refcnt, 1);
2908         vs->flags = (flags & VXLAN_F_RCV_FLAGS);
2909
2910         spin_lock(&vn->sock_lock);
2911         hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
2912         udp_tunnel_notify_add_rx_port(sock,
2913                                       (vs->flags & VXLAN_F_GPE) ?
2914                                       UDP_TUNNEL_TYPE_VXLAN_GPE :
2915                                       UDP_TUNNEL_TYPE_VXLAN);
2916         spin_unlock(&vn->sock_lock);
2917
2918         /* Mark socket as an encapsulation socket. */
2919         memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
2920         tunnel_cfg.sk_user_data = vs;
2921         tunnel_cfg.encap_type = 1;
2922         tunnel_cfg.encap_rcv = vxlan_rcv;
2923         tunnel_cfg.encap_destroy = NULL;
2924         tunnel_cfg.gro_receive = vxlan_gro_receive;
2925         tunnel_cfg.gro_complete = vxlan_gro_complete;
2926
2927         setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
2928
2929         return vs;
2930 }
2931
2932 static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6)
2933 {
2934         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2935         struct vxlan_sock *vs = NULL;
2936         struct vxlan_dev_node *node;
2937
2938         if (!vxlan->cfg.no_share) {
2939                 spin_lock(&vn->sock_lock);
2940                 vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
2941                                      vxlan->cfg.dst_port, vxlan->cfg.flags);
2942                 if (vs && !refcount_inc_not_zero(&vs->refcnt)) {
2943                         spin_unlock(&vn->sock_lock);
2944                         return -EBUSY;
2945                 }
2946                 spin_unlock(&vn->sock_lock);
2947         }
2948         if (!vs)
2949                 vs = vxlan_socket_create(vxlan->net, ipv6,
2950                                          vxlan->cfg.dst_port, vxlan->cfg.flags);
2951         if (IS_ERR(vs))
2952                 return PTR_ERR(vs);
2953 #if IS_ENABLED(CONFIG_IPV6)
2954         if (ipv6) {
2955                 rcu_assign_pointer(vxlan->vn6_sock, vs);
2956                 node = &vxlan->hlist6;
2957         } else
2958 #endif
2959         {
2960                 rcu_assign_pointer(vxlan->vn4_sock, vs);
2961                 node = &vxlan->hlist4;
2962         }
2963         vxlan_vs_add_dev(vs, vxlan, node);
2964         return 0;
2965 }
2966
2967 static int vxlan_sock_add(struct vxlan_dev *vxlan)
2968 {
2969         bool metadata = vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA;
2970         bool ipv6 = vxlan->cfg.flags & VXLAN_F_IPV6 || metadata;
2971         bool ipv4 = !ipv6 || metadata;
2972         int ret = 0;
2973
2974         RCU_INIT_POINTER(vxlan->vn4_sock, NULL);
2975 #if IS_ENABLED(CONFIG_IPV6)
2976         RCU_INIT_POINTER(vxlan->vn6_sock, NULL);
2977         if (ipv6) {
2978                 ret = __vxlan_sock_add(vxlan, true);
2979                 if (ret < 0 && ret != -EAFNOSUPPORT)
2980                         ipv4 = false;
2981         }
2982 #endif
2983         if (ipv4)
2984                 ret = __vxlan_sock_add(vxlan, false);
2985         if (ret < 0)
2986                 vxlan_sock_release(vxlan);
2987         return ret;
2988 }
2989
2990 static int vxlan_config_validate(struct net *src_net, struct vxlan_config *conf,
2991                                  struct net_device **lower,
2992                                  struct vxlan_dev *old,
2993                                  struct netlink_ext_ack *extack)
2994 {
2995         struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
2996         struct vxlan_dev *tmp;
2997         bool use_ipv6 = false;
2998
2999         if (conf->flags & VXLAN_F_GPE) {
3000                 /* For now, allow GPE only together with
3001                  * COLLECT_METADATA. This can be relaxed later; in such
3002                  * case, the other side of the PtP link will have to be
3003                  * provided.
3004                  */
3005                 if ((conf->flags & ~VXLAN_F_ALLOWED_GPE) ||
3006                     !(conf->flags & VXLAN_F_COLLECT_METADATA)) {
3007                         NL_SET_ERR_MSG(extack,
3008                                        "VXLAN GPE does not support this combination of attributes");
3009                         return -EINVAL;
3010                 }
3011         }
3012
3013         if (!conf->remote_ip.sa.sa_family && !conf->saddr.sa.sa_family) {
3014                 /* Unless IPv6 is explicitly requested, assume IPv4 */
3015                 conf->remote_ip.sa.sa_family = AF_INET;
3016                 conf->saddr.sa.sa_family = AF_INET;
3017         } else if (!conf->remote_ip.sa.sa_family) {
3018                 conf->remote_ip.sa.sa_family = conf->saddr.sa.sa_family;
3019         } else if (!conf->saddr.sa.sa_family) {
3020                 conf->saddr.sa.sa_family = conf->remote_ip.sa.sa_family;
3021         }
3022
3023         if (conf->saddr.sa.sa_family != conf->remote_ip.sa.sa_family) {
3024                 NL_SET_ERR_MSG(extack,
3025                                "Local and remote address must be from the same family");
3026                 return -EINVAL;
3027         }
3028
3029         if (vxlan_addr_multicast(&conf->saddr)) {
3030                 NL_SET_ERR_MSG(extack, "Local address cannot be multicast");
3031                 return -EINVAL;
3032         }
3033
3034         if (conf->saddr.sa.sa_family == AF_INET6) {
3035                 if (!IS_ENABLED(CONFIG_IPV6)) {
3036                         NL_SET_ERR_MSG(extack,
3037                                        "IPv6 support not enabled in the kernel");
3038                         return -EPFNOSUPPORT;
3039                 }
3040                 use_ipv6 = true;
3041                 conf->flags |= VXLAN_F_IPV6;
3042
3043                 if (!(conf->flags & VXLAN_F_COLLECT_METADATA)) {
3044                         int local_type =
3045                                 ipv6_addr_type(&conf->saddr.sin6.sin6_addr);
3046                         int remote_type =
3047                                 ipv6_addr_type(&conf->remote_ip.sin6.sin6_addr);
3048
3049                         if (local_type & IPV6_ADDR_LINKLOCAL) {
3050                                 if (!(remote_type & IPV6_ADDR_LINKLOCAL) &&
3051                                     (remote_type != IPV6_ADDR_ANY)) {
3052                                         NL_SET_ERR_MSG(extack,
3053                                                        "Invalid combination of local and remote address scopes");
3054                                         return -EINVAL;
3055                                 }
3056
3057                                 conf->flags |= VXLAN_F_IPV6_LINKLOCAL;
3058                         } else {
3059                                 if (remote_type ==
3060                                     (IPV6_ADDR_UNICAST | IPV6_ADDR_LINKLOCAL)) {
3061                                         NL_SET_ERR_MSG(extack,
3062                                                        "Invalid combination of local and remote address scopes");
3063                                         return -EINVAL;
3064                                 }
3065
3066                                 conf->flags &= ~VXLAN_F_IPV6_LINKLOCAL;
3067                         }
3068                 }
3069         }
3070
3071         if (conf->label && !use_ipv6) {
3072                 NL_SET_ERR_MSG(extack,
3073                                "Label attribute only applies to IPv6 VXLAN devices");
3074                 return -EINVAL;
3075         }
3076
3077         if (conf->remote_ifindex) {
3078                 struct net_device *lowerdev;
3079
3080                 lowerdev = __dev_get_by_index(src_net, conf->remote_ifindex);
3081                 if (!lowerdev) {
3082                         NL_SET_ERR_MSG(extack,
3083                                        "Invalid local interface, device not found");
3084                         return -ENODEV;
3085                 }
3086
3087 #if IS_ENABLED(CONFIG_IPV6)
3088                 if (use_ipv6) {
3089                         struct inet6_dev *idev = __in6_dev_get(lowerdev);
3090                         if (idev && idev->cnf.disable_ipv6) {
3091                                 NL_SET_ERR_MSG(extack,
3092                                                "IPv6 support disabled by administrator");
3093                                 return -EPERM;
3094                         }
3095                 }
3096 #endif
3097
3098                 *lower = lowerdev;
3099         } else {
3100                 if (vxlan_addr_multicast(&conf->remote_ip)) {
3101                         NL_SET_ERR_MSG(extack,
3102                                        "Local interface required for multicast remote destination");
3103
3104                         return -EINVAL;
3105                 }
3106
3107 #if IS_ENABLED(CONFIG_IPV6)
3108                 if (conf->flags & VXLAN_F_IPV6_LINKLOCAL) {
3109                         NL_SET_ERR_MSG(extack,
3110                                        "Local interface required for link-local local/remote addresses");
3111                         return -EINVAL;
3112                 }
3113 #endif
3114
3115                 *lower = NULL;
3116         }
3117
3118         if (!conf->dst_port) {
3119                 if (conf->flags & VXLAN_F_GPE)
3120                         conf->dst_port = htons(4790); /* IANA VXLAN-GPE port */
3121                 else
3122                         conf->dst_port = htons(vxlan_port);
3123         }
3124
3125         if (!conf->age_interval)
3126                 conf->age_interval = FDB_AGE_DEFAULT;
3127
3128         list_for_each_entry(tmp, &vn->vxlan_list, next) {
3129                 if (tmp == old)
3130                         continue;
3131
3132                 if (tmp->cfg.vni != conf->vni)
3133                         continue;
3134                 if (tmp->cfg.dst_port != conf->dst_port)
3135                         continue;
3136                 if ((tmp->cfg.flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)) !=
3137                     (conf->flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)))
3138                         continue;
3139
3140                 if ((conf->flags & VXLAN_F_IPV6_LINKLOCAL) &&
3141                     tmp->cfg.remote_ifindex != conf->remote_ifindex)
3142                         continue;
3143
3144                 NL_SET_ERR_MSG(extack,
3145                                "A VXLAN device with the specified VNI already exists");
3146                 return -EEXIST;
3147         }
3148
3149         return 0;
3150 }
3151
3152 static void vxlan_config_apply(struct net_device *dev,
3153                                struct vxlan_config *conf,
3154                                struct net_device *lowerdev,
3155                                struct net *src_net,
3156                                bool changelink)
3157 {
3158         struct vxlan_dev *vxlan = netdev_priv(dev);
3159         struct vxlan_rdst *dst = &vxlan->default_dst;
3160         unsigned short needed_headroom = ETH_HLEN;
3161         bool use_ipv6 = !!(conf->flags & VXLAN_F_IPV6);
3162         int max_mtu = ETH_MAX_MTU;
3163
3164         if (!changelink) {
3165                 if (conf->flags & VXLAN_F_GPE)
3166                         vxlan_raw_setup(dev);
3167                 else
3168                         vxlan_ether_setup(dev);
3169
3170                 if (conf->mtu)
3171                         dev->mtu = conf->mtu;
3172
3173                 vxlan->net = src_net;
3174         }
3175
3176         dst->remote_vni = conf->vni;
3177
3178         memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip));
3179
3180         if (lowerdev) {
3181                 dst->remote_ifindex = conf->remote_ifindex;
3182
3183                 dev->gso_max_size = lowerdev->gso_max_size;
3184                 dev->gso_max_segs = lowerdev->gso_max_segs;
3185
3186                 needed_headroom = lowerdev->hard_header_len;
3187                 needed_headroom += lowerdev->needed_headroom;
3188
3189                 dev->needed_tailroom = lowerdev->needed_tailroom;
3190
3191                 max_mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM :
3192                                            VXLAN_HEADROOM);
3193                 if (max_mtu < ETH_MIN_MTU)
3194                         max_mtu = ETH_MIN_MTU;
3195
3196                 if (!changelink && !conf->mtu)
3197                         dev->mtu = max_mtu;
3198         }
3199
3200         if (dev->mtu > max_mtu)
3201                 dev->mtu = max_mtu;
3202
3203         if (use_ipv6 || conf->flags & VXLAN_F_COLLECT_METADATA)
3204                 needed_headroom += VXLAN6_HEADROOM;
3205         else
3206                 needed_headroom += VXLAN_HEADROOM;
3207         dev->needed_headroom = needed_headroom;
3208
3209         memcpy(&vxlan->cfg, conf, sizeof(*conf));
3210 }
3211
3212 static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
3213                                struct vxlan_config *conf, bool changelink,
3214                                struct netlink_ext_ack *extack)
3215 {
3216         struct vxlan_dev *vxlan = netdev_priv(dev);
3217         struct net_device *lowerdev;
3218         int ret;
3219
3220         ret = vxlan_config_validate(src_net, conf, &lowerdev, vxlan, extack);
3221         if (ret)
3222                 return ret;
3223
3224         vxlan_config_apply(dev, conf, lowerdev, src_net, changelink);
3225
3226         return 0;
3227 }
3228
3229 static int __vxlan_dev_create(struct net *net, struct net_device *dev,
3230                               struct vxlan_config *conf,
3231                               struct netlink_ext_ack *extack)
3232 {
3233         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3234         struct vxlan_dev *vxlan = netdev_priv(dev);
3235         struct vxlan_fdb *f = NULL;
3236         bool unregister = false;
3237         int err;
3238
3239         err = vxlan_dev_configure(net, dev, conf, false, extack);
3240         if (err)
3241                 return err;
3242
3243         dev->ethtool_ops = &vxlan_ethtool_ops;
3244
3245         /* create an fdb entry for a valid default destination */
3246         if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
3247                 err = vxlan_fdb_create(vxlan, all_zeros_mac,
3248                                        &vxlan->default_dst.remote_ip,
3249                                        NUD_REACHABLE | NUD_PERMANENT,
3250                                        vxlan->cfg.dst_port,
3251                                        vxlan->default_dst.remote_vni,
3252                                        vxlan->default_dst.remote_vni,
3253                                        vxlan->default_dst.remote_ifindex,
3254                                        NTF_SELF, &f);
3255                 if (err)
3256                         return err;
3257         }
3258
3259         err = register_netdevice(dev);
3260         if (err)
3261                 goto errout;
3262         unregister = true;
3263
3264         err = rtnl_configure_link(dev, NULL);
3265         if (err)
3266                 goto errout;
3267
3268         /* notify default fdb entry */
3269         if (f)
3270                 vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_NEWNEIGH);
3271
3272         list_add(&vxlan->next, &vn->vxlan_list);
3273         return 0;
3274
3275 errout:
3276         /* unregister_netdevice() destroys the default FDB entry with deletion
3277          * notification. But the addition notification was not sent yet, so
3278          * destroy the entry by hand here.
3279          */
3280         if (f)
3281                 vxlan_fdb_destroy(vxlan, f, false);
3282         if (unregister)
3283                 unregister_netdevice(dev);
3284         return err;
3285 }
3286
3287 static int vxlan_nl2conf(struct nlattr *tb[], struct nlattr *data[],
3288                          struct net_device *dev, struct vxlan_config *conf,
3289                          bool changelink)
3290 {
3291         struct vxlan_dev *vxlan = netdev_priv(dev);
3292
3293         memset(conf, 0, sizeof(*conf));
3294
3295         /* if changelink operation, start with old existing cfg */
3296         if (changelink)
3297                 memcpy(conf, &vxlan->cfg, sizeof(*conf));
3298
3299         if (data[IFLA_VXLAN_ID]) {
3300                 __be32 vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
3301
3302                 if (changelink && (vni != conf->vni))
3303                         return -EOPNOTSUPP;
3304                 conf->vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
3305         }
3306
3307         if (data[IFLA_VXLAN_GROUP]) {
3308                 if (changelink && (conf->remote_ip.sa.sa_family != AF_INET))
3309                         return -EOPNOTSUPP;
3310
3311                 conf->remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
3312                 conf->remote_ip.sa.sa_family = AF_INET;
3313         } else if (data[IFLA_VXLAN_GROUP6]) {
3314                 if (!IS_ENABLED(CONFIG_IPV6))
3315                         return -EPFNOSUPPORT;
3316
3317                 if (changelink && (conf->remote_ip.sa.sa_family != AF_INET6))
3318                         return -EOPNOTSUPP;
3319
3320                 conf->remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]);
3321                 conf->remote_ip.sa.sa_family = AF_INET6;
3322         }
3323
3324         if (data[IFLA_VXLAN_LOCAL]) {
3325                 if (changelink && (conf->saddr.sa.sa_family != AF_INET))
3326                         return -EOPNOTSUPP;
3327
3328                 conf->saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]);
3329                 conf->saddr.sa.sa_family = AF_INET;
3330         } else if (data[IFLA_VXLAN_LOCAL6]) {
3331                 if (!IS_ENABLED(CONFIG_IPV6))
3332                         return -EPFNOSUPPORT;
3333
3334                 if (changelink && (conf->saddr.sa.sa_family != AF_INET6))
3335                         return -EOPNOTSUPP;
3336
3337                 /* TODO: respect scope id */
3338                 conf->saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
3339                 conf->saddr.sa.sa_family = AF_INET6;
3340         }
3341
3342         if (data[IFLA_VXLAN_LINK])
3343                 conf->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]);
3344
3345         if (data[IFLA_VXLAN_TOS])
3346                 conf->tos  = nla_get_u8(data[IFLA_VXLAN_TOS]);
3347
3348         if (data[IFLA_VXLAN_TTL])
3349                 conf->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
3350
3351         if (data[IFLA_VXLAN_TTL_INHERIT]) {
3352                 if (changelink)
3353                         return -EOPNOTSUPP;
3354                 conf->flags |= VXLAN_F_TTL_INHERIT;
3355         }
3356
3357         if (data[IFLA_VXLAN_LABEL])
3358                 conf->label = nla_get_be32(data[IFLA_VXLAN_LABEL]) &
3359                              IPV6_FLOWLABEL_MASK;
3360
3361         if (data[IFLA_VXLAN_LEARNING]) {
3362                 if (nla_get_u8(data[IFLA_VXLAN_LEARNING]))
3363                         conf->flags |= VXLAN_F_LEARN;
3364                 else
3365                         conf->flags &= ~VXLAN_F_LEARN;
3366         } else if (!changelink) {
3367                 /* default to learn on a new device */
3368                 conf->flags |= VXLAN_F_LEARN;
3369         }
3370
3371         if (data[IFLA_VXLAN_AGEING]) {
3372                 if (changelink)
3373                         return -EOPNOTSUPP;
3374                 conf->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
3375         }
3376
3377         if (data[IFLA_VXLAN_PROXY]) {
3378                 if (changelink)
3379                         return -EOPNOTSUPP;
3380                 if (nla_get_u8(data[IFLA_VXLAN_PROXY]))
3381                         conf->flags |= VXLAN_F_PROXY;
3382         }
3383
3384         if (data[IFLA_VXLAN_RSC]) {
3385                 if (changelink)
3386                         return -EOPNOTSUPP;
3387                 if (nla_get_u8(data[IFLA_VXLAN_RSC]))
3388                         conf->flags |= VXLAN_F_RSC;
3389         }
3390
3391         if (data[IFLA_VXLAN_L2MISS]) {
3392                 if (changelink)
3393                         return -EOPNOTSUPP;
3394                 if (nla_get_u8(data[IFLA_VXLAN_L2MISS]))
3395                         conf->flags |= VXLAN_F_L2MISS;
3396         }
3397
3398         if (data[IFLA_VXLAN_L3MISS]) {
3399                 if (changelink)
3400                         return -EOPNOTSUPP;
3401                 if (nla_get_u8(data[IFLA_VXLAN_L3MISS]))
3402                         conf->flags |= VXLAN_F_L3MISS;
3403         }
3404
3405         if (data[IFLA_VXLAN_LIMIT]) {
3406                 if (changelink)
3407                         return -EOPNOTSUPP;
3408                 conf->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
3409         }
3410
3411         if (data[IFLA_VXLAN_COLLECT_METADATA]) {
3412                 if (changelink)
3413                         return -EOPNOTSUPP;
3414                 if (nla_get_u8(data[IFLA_VXLAN_COLLECT_METADATA]))
3415                         conf->flags |= VXLAN_F_COLLECT_METADATA;
3416         }
3417
3418         if (data[IFLA_VXLAN_PORT_RANGE]) {
3419                 if (!changelink) {
3420                         const struct ifla_vxlan_port_range *p
3421                                 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
3422                         conf->port_min = ntohs(p->low);
3423                         conf->port_max = ntohs(p->high);
3424                 } else {
3425                         return -EOPNOTSUPP;
3426                 }
3427         }
3428
3429         if (data[IFLA_VXLAN_PORT]) {
3430                 if (changelink)
3431                         return -EOPNOTSUPP;
3432                 conf->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
3433         }
3434
3435         if (data[IFLA_VXLAN_UDP_CSUM]) {
3436                 if (changelink)
3437                         return -EOPNOTSUPP;
3438                 if (!nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
3439                         conf->flags |= VXLAN_F_UDP_ZERO_CSUM_TX;
3440         }
3441
3442         if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]) {
3443                 if (changelink)
3444                         return -EOPNOTSUPP;
3445                 if (nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
3446                         conf->flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
3447         }
3448
3449         if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]) {
3450                 if (changelink)
3451                         return -EOPNOTSUPP;
3452                 if (nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
3453                         conf->flags |= VXLAN_F_UDP_ZERO_CSUM6_RX;
3454         }
3455
3456         if (data[IFLA_VXLAN_REMCSUM_TX]) {
3457                 if (changelink)
3458                         return -EOPNOTSUPP;
3459                 if (nla_get_u8(data[IFLA_VXLAN_REMCSUM_TX]))
3460                         conf->flags |= VXLAN_F_REMCSUM_TX;
3461         }
3462
3463         if (data[IFLA_VXLAN_REMCSUM_RX]) {
3464                 if (changelink)
3465                         return -EOPNOTSUPP;
3466                 if (nla_get_u8(data[IFLA_VXLAN_REMCSUM_RX]))
3467                         conf->flags |= VXLAN_F_REMCSUM_RX;
3468         }
3469
3470         if (data[IFLA_VXLAN_GBP]) {
3471                 if (changelink)
3472                         return -EOPNOTSUPP;
3473                 conf->flags |= VXLAN_F_GBP;
3474         }
3475
3476         if (data[IFLA_VXLAN_GPE]) {
3477                 if (changelink)
3478                         return -EOPNOTSUPP;
3479                 conf->flags |= VXLAN_F_GPE;
3480         }
3481
3482         if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL]) {
3483                 if (changelink)
3484                         return -EOPNOTSUPP;
3485                 conf->flags |= VXLAN_F_REMCSUM_NOPARTIAL;
3486         }
3487
3488         if (tb[IFLA_MTU]) {
3489                 if (changelink)
3490                         return -EOPNOTSUPP;
3491                 conf->mtu = nla_get_u32(tb[IFLA_MTU]);
3492         }
3493
3494         return 0;
3495 }
3496
3497 static int vxlan_newlink(struct net *src_net, struct net_device *dev,
3498                          struct nlattr *tb[], struct nlattr *data[],
3499                          struct netlink_ext_ack *extack)
3500 {
3501         struct vxlan_config conf;
3502         int err;
3503
3504         err = vxlan_nl2conf(tb, data, dev, &conf, false);
3505         if (err)
3506                 return err;
3507
3508         return __vxlan_dev_create(src_net, dev, &conf, extack);
3509 }
3510
3511 static int vxlan_changelink(struct net_device *dev, struct nlattr *tb[],
3512                             struct nlattr *data[],
3513                             struct netlink_ext_ack *extack)
3514 {
3515         struct vxlan_dev *vxlan = netdev_priv(dev);
3516         struct vxlan_rdst *dst = &vxlan->default_dst;
3517         struct vxlan_rdst old_dst;
3518         struct vxlan_config conf;
3519         int err;
3520
3521         err = vxlan_nl2conf(tb, data,
3522                             dev, &conf, true);
3523         if (err)
3524                 return err;
3525
3526         memcpy(&old_dst, dst, sizeof(struct vxlan_rdst));
3527
3528         err = vxlan_dev_configure(vxlan->net, dev, &conf, true, extack);
3529         if (err)
3530                 return err;
3531
3532         /* handle default dst entry */
3533         if (!vxlan_addr_equal(&dst->remote_ip, &old_dst.remote_ip)) {
3534                 spin_lock_bh(&vxlan->hash_lock);
3535                 if (!vxlan_addr_any(&old_dst.remote_ip))
3536                         __vxlan_fdb_delete(vxlan, all_zeros_mac,
3537                                            old_dst.remote_ip,
3538                                            vxlan->cfg.dst_port,
3539                                            old_dst.remote_vni,
3540                                            old_dst.remote_vni,
3541                                            old_dst.remote_ifindex, 0);
3542
3543                 if (!vxlan_addr_any(&dst->remote_ip)) {
3544                         err = vxlan_fdb_update(vxlan, all_zeros_mac,
3545                                                &dst->remote_ip,
3546                                                NUD_REACHABLE | NUD_PERMANENT,
3547                                                NLM_F_APPEND | NLM_F_CREATE,
3548                                                vxlan->cfg.dst_port,
3549                                                dst->remote_vni,
3550                                                dst->remote_vni,
3551                                                dst->remote_ifindex,
3552                                                NTF_SELF);
3553                         if (err) {
3554                                 spin_unlock_bh(&vxlan->hash_lock);
3555                                 return err;
3556                         }
3557                 }
3558                 spin_unlock_bh(&vxlan->hash_lock);
3559         }
3560
3561         return 0;
3562 }
3563
3564 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
3565 {
3566         struct vxlan_dev *vxlan = netdev_priv(dev);
3567
3568         vxlan_flush(vxlan, true);
3569
3570         list_del(&vxlan->next);
3571         unregister_netdevice_queue(dev, head);
3572 }
3573
3574 static size_t vxlan_get_size(const struct net_device *dev)
3575 {
3576
3577         return nla_total_size(sizeof(__u32)) +  /* IFLA_VXLAN_ID */
3578                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
3579                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
3580                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
3581                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TTL */
3582                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TTL_INHERIT */
3583                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TOS */
3584                 nla_total_size(sizeof(__be32)) + /* IFLA_VXLAN_LABEL */
3585                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_LEARNING */
3586                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_PROXY */
3587                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_RSC */
3588                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_L2MISS */
3589                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_L3MISS */
3590                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_COLLECT_METADATA */
3591                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
3592                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
3593                 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
3594                 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
3595                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
3596                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
3597                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
3598                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
3599                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
3600                 0;
3601 }
3602
3603 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
3604 {
3605         const struct vxlan_dev *vxlan = netdev_priv(dev);
3606         const struct vxlan_rdst *dst = &vxlan->default_dst;
3607         struct ifla_vxlan_port_range ports = {
3608                 .low =  htons(vxlan->cfg.port_min),
3609                 .high = htons(vxlan->cfg.port_max),
3610         };
3611
3612         if (nla_put_u32(skb, IFLA_VXLAN_ID, be32_to_cpu(dst->remote_vni)))
3613                 goto nla_put_failure;
3614
3615         if (!vxlan_addr_any(&dst->remote_ip)) {
3616                 if (dst->remote_ip.sa.sa_family == AF_INET) {
3617                         if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP,
3618                                             dst->remote_ip.sin.sin_addr.s_addr))
3619                                 goto nla_put_failure;
3620 #if IS_ENABLED(CONFIG_IPV6)
3621                 } else {
3622                         if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6,
3623                                              &dst->remote_ip.sin6.sin6_addr))
3624                                 goto nla_put_failure;
3625 #endif
3626                 }
3627         }
3628
3629         if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
3630                 goto nla_put_failure;
3631
3632         if (!vxlan_addr_any(&vxlan->cfg.saddr)) {
3633                 if (vxlan->cfg.saddr.sa.sa_family == AF_INET) {
3634                         if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL,
3635                                             vxlan->cfg.saddr.sin.sin_addr.s_addr))
3636                                 goto nla_put_failure;
3637 #if IS_ENABLED(CONFIG_IPV6)
3638                 } else {
3639                         if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6,
3640                                              &vxlan->cfg.saddr.sin6.sin6_addr))
3641                                 goto nla_put_failure;
3642 #endif
3643                 }
3644         }
3645
3646         if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) ||
3647             nla_put_u8(skb, IFLA_VXLAN_TTL_INHERIT,
3648                        !!(vxlan->cfg.flags & VXLAN_F_TTL_INHERIT)) ||
3649             nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) ||
3650             nla_put_be32(skb, IFLA_VXLAN_LABEL, vxlan->cfg.label) ||
3651             nla_put_u8(skb, IFLA_VXLAN_LEARNING,
3652                         !!(vxlan->cfg.flags & VXLAN_F_LEARN)) ||
3653             nla_put_u8(skb, IFLA_VXLAN_PROXY,
3654                         !!(vxlan->cfg.flags & VXLAN_F_PROXY)) ||
3655             nla_put_u8(skb, IFLA_VXLAN_RSC,
3656                        !!(vxlan->cfg.flags & VXLAN_F_RSC)) ||
3657             nla_put_u8(skb, IFLA_VXLAN_L2MISS,
3658                         !!(vxlan->cfg.flags & VXLAN_F_L2MISS)) ||
3659             nla_put_u8(skb, IFLA_VXLAN_L3MISS,
3660                         !!(vxlan->cfg.flags & VXLAN_F_L3MISS)) ||
3661             nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA,
3662                        !!(vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)) ||
3663             nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) ||
3664             nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) ||
3665             nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) ||
3666             nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
3667                         !(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM_TX)) ||
3668             nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
3669                         !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
3670             nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
3671                         !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
3672             nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
3673                         !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_TX)) ||
3674             nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
3675                         !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_RX)))
3676                 goto nla_put_failure;
3677
3678         if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
3679                 goto nla_put_failure;
3680
3681         if (vxlan->cfg.flags & VXLAN_F_GBP &&
3682             nla_put_flag(skb, IFLA_VXLAN_GBP))
3683                 goto nla_put_failure;
3684
3685         if (vxlan->cfg.flags & VXLAN_F_GPE &&
3686             nla_put_flag(skb, IFLA_VXLAN_GPE))
3687                 goto nla_put_failure;
3688
3689         if (vxlan->cfg.flags & VXLAN_F_REMCSUM_NOPARTIAL &&
3690             nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
3691                 goto nla_put_failure;
3692
3693         return 0;
3694
3695 nla_put_failure:
3696         return -EMSGSIZE;
3697 }
3698
3699 static struct net *vxlan_get_link_net(const struct net_device *dev)
3700 {
3701         struct vxlan_dev *vxlan = netdev_priv(dev);
3702
3703         return vxlan->net;
3704 }
3705
3706 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
3707         .kind           = "vxlan",
3708         .maxtype        = IFLA_VXLAN_MAX,
3709         .policy         = vxlan_policy,
3710         .priv_size      = sizeof(struct vxlan_dev),
3711         .setup          = vxlan_setup,
3712         .validate       = vxlan_validate,
3713         .newlink        = vxlan_newlink,
3714         .changelink     = vxlan_changelink,
3715         .dellink        = vxlan_dellink,
3716         .get_size       = vxlan_get_size,
3717         .fill_info      = vxlan_fill_info,
3718         .get_link_net   = vxlan_get_link_net,
3719 };
3720
3721 struct net_device *vxlan_dev_create(struct net *net, const char *name,
3722                                     u8 name_assign_type,
3723                                     struct vxlan_config *conf)
3724 {
3725         struct nlattr *tb[IFLA_MAX + 1];
3726         struct net_device *dev;
3727         int err;
3728
3729         memset(&tb, 0, sizeof(tb));
3730
3731         dev = rtnl_create_link(net, name, name_assign_type,
3732                                &vxlan_link_ops, tb);
3733         if (IS_ERR(dev))
3734                 return dev;
3735
3736         err = __vxlan_dev_create(net, dev, conf, NULL);
3737         if (err < 0) {
3738                 free_netdev(dev);
3739                 return ERR_PTR(err);
3740         }
3741
3742         err = rtnl_configure_link(dev, NULL);
3743         if (err < 0) {
3744                 LIST_HEAD(list_kill);
3745
3746                 vxlan_dellink(dev, &list_kill);
3747                 unregister_netdevice_many(&list_kill);
3748                 return ERR_PTR(err);
3749         }
3750
3751         return dev;
3752 }
3753 EXPORT_SYMBOL_GPL(vxlan_dev_create);
3754
3755 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
3756                                              struct net_device *dev)
3757 {
3758         struct vxlan_dev *vxlan, *next;
3759         LIST_HEAD(list_kill);
3760
3761         list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3762                 struct vxlan_rdst *dst = &vxlan->default_dst;
3763
3764                 /* In case we created vxlan device with carrier
3765                  * and we loose the carrier due to module unload
3766                  * we also need to remove vxlan device. In other
3767                  * cases, it's not necessary and remote_ifindex
3768                  * is 0 here, so no matches.
3769                  */
3770                 if (dst->remote_ifindex == dev->ifindex)
3771                         vxlan_dellink(vxlan->dev, &list_kill);
3772         }
3773
3774         unregister_netdevice_many(&list_kill);
3775 }
3776
3777 static int vxlan_netdevice_event(struct notifier_block *unused,
3778                                  unsigned long event, void *ptr)
3779 {
3780         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3781         struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
3782
3783         if (event == NETDEV_UNREGISTER) {
3784                 vxlan_offload_rx_ports(dev, false);
3785                 vxlan_handle_lowerdev_unregister(vn, dev);
3786         } else if (event == NETDEV_REGISTER) {
3787                 vxlan_offload_rx_ports(dev, true);
3788         } else if (event == NETDEV_UDP_TUNNEL_PUSH_INFO ||
3789                    event == NETDEV_UDP_TUNNEL_DROP_INFO) {
3790                 vxlan_offload_rx_ports(dev, event == NETDEV_UDP_TUNNEL_PUSH_INFO);
3791         }
3792
3793         return NOTIFY_DONE;
3794 }
3795
3796 static struct notifier_block vxlan_notifier_block __read_mostly = {
3797         .notifier_call = vxlan_netdevice_event,
3798 };
3799
3800 static __net_init int vxlan_init_net(struct net *net)
3801 {
3802         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3803         unsigned int h;
3804
3805         INIT_LIST_HEAD(&vn->vxlan_list);
3806         spin_lock_init(&vn->sock_lock);
3807
3808         for (h = 0; h < PORT_HASH_SIZE; ++h)
3809                 INIT_HLIST_HEAD(&vn->sock_list[h]);
3810
3811         return 0;
3812 }
3813
3814 static void vxlan_destroy_tunnels(struct net *net, struct list_head *head)
3815 {
3816         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3817         struct vxlan_dev *vxlan, *next;
3818         struct net_device *dev, *aux;
3819
3820         for_each_netdev_safe(net, dev, aux)
3821                 if (dev->rtnl_link_ops == &vxlan_link_ops)
3822                         unregister_netdevice_queue(dev, head);
3823
3824         list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3825                 /* If vxlan->dev is in the same netns, it has already been added
3826                  * to the list by the previous loop.
3827                  */
3828                 if (!net_eq(dev_net(vxlan->dev), net))
3829                         unregister_netdevice_queue(vxlan->dev, head);
3830         }
3831
3832 }
3833
3834 static void __net_exit vxlan_exit_batch_net(struct list_head *net_list)
3835 {
3836         struct net *net;
3837         LIST_HEAD(list);
3838         unsigned int h;
3839
3840         rtnl_lock();
3841         list_for_each_entry(net, net_list, exit_list)
3842                 vxlan_destroy_tunnels(net, &list);
3843
3844         unregister_netdevice_many(&list);
3845         rtnl_unlock();
3846
3847         list_for_each_entry(net, net_list, exit_list) {
3848                 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3849
3850                 for (h = 0; h < PORT_HASH_SIZE; ++h)
3851                         WARN_ON_ONCE(!hlist_empty(&vn->sock_list[h]));
3852         }
3853 }
3854
3855 static struct pernet_operations vxlan_net_ops = {
3856         .init = vxlan_init_net,
3857         .exit_batch = vxlan_exit_batch_net,
3858         .id   = &vxlan_net_id,
3859         .size = sizeof(struct vxlan_net),
3860 };
3861
3862 static int __init vxlan_init_module(void)
3863 {
3864         int rc;
3865
3866         get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
3867
3868         rc = register_pernet_subsys(&vxlan_net_ops);
3869         if (rc)
3870                 goto out1;
3871
3872         rc = register_netdevice_notifier(&vxlan_notifier_block);
3873         if (rc)
3874                 goto out2;
3875
3876         rc = rtnl_link_register(&vxlan_link_ops);
3877         if (rc)
3878                 goto out3;
3879
3880         return 0;
3881 out3:
3882         unregister_netdevice_notifier(&vxlan_notifier_block);
3883 out2:
3884         unregister_pernet_subsys(&vxlan_net_ops);
3885 out1:
3886         return rc;
3887 }
3888 late_initcall(vxlan_init_module);
3889
3890 static void __exit vxlan_cleanup_module(void)
3891 {
3892         rtnl_link_unregister(&vxlan_link_ops);
3893         unregister_netdevice_notifier(&vxlan_notifier_block);
3894         unregister_pernet_subsys(&vxlan_net_ops);
3895         /* rcu_barrier() is called by netns */
3896 }
3897 module_exit(vxlan_cleanup_module);
3898
3899 MODULE_LICENSE("GPL");
3900 MODULE_VERSION(VXLAN_VERSION);
3901 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
3902 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
3903 MODULE_ALIAS_RTNL_LINK("vxlan");