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/types.h>
  15 #include <linux/module.h>
  16 #include <linux/errno.h>
  17 #include <linux/slab.h>
  18 #include <linux/skbuff.h>
  19 #include <linux/rculist.h>
  20 #include <linux/netdevice.h>
  21 #include <linux/in.h>
  22 #include <linux/ip.h>
  23 #include <linux/udp.h>
  24 #include <linux/igmp.h>
  25 #include <linux/etherdevice.h>
  26 #include <linux/if_ether.h>
  27 #include <linux/if_vlan.h>
  28 #include <linux/hash.h>
  29 #include <linux/ethtool.h>
  30 #include <net/arp.h>
  31 #include <net/ndisc.h>
  32 #include <net/ip.h>
  33 #include <net/ip_tunnels.h>
  34 #include <net/icmp.h>
  35 #include <net/udp.h>
  36 #include <net/rtnetlink.h>
  37 #include <net/route.h>
  38 #include <net/dsfield.h>
  39 #include <net/inet_ecn.h>
  40 #include <net/net_namespace.h>
  41 #include <net/netns/generic.h>
  42 #include <net/vxlan.h>
  43 #include <net/protocol.h>
  44 #if IS_ENABLED(CONFIG_IPV6)
  45 #include <net/ipv6.h>
  46 #include <net/addrconf.h>
  47 #include <net/ip6_tunnel.h>
  48 #include <net/ip6_checksum.h>
  49 #endif
  50
  51 #define VXLAN_VERSION   "0.1"
  52
  53 #define PORT_HASH_BITS  8
  54 #define PORT_HASH_SIZE  (1<<PORT_HASH_BITS)
  55 #define VNI_HASH_BITS   10
  56 #define VNI_HASH_SIZE   (1<<VNI_HASH_BITS)
  57 #define FDB_HASH_BITS   8
  58 #define FDB_HASH_SIZE   (1<<FDB_HASH_BITS)
  59 #define FDB_AGE_DEFAULT 300 /* 5 min */
  60 #define FDB_AGE_INTERVAL (10 * HZ)      /* rescan interval */
  61
  62 #define VXLAN_N_VID     (1u << 24)
  63 #define VXLAN_VID_MASK  (VXLAN_N_VID - 1)
  64 #define VXLAN_HLEN (sizeof(struct udphdr) + sizeof(struct vxlanhdr))
  65
  66 #define VXLAN_FLAGS 0x08000000  /* struct vxlanhdr.vx_flags required value. */
  67
  68 /* VXLAN protocol header */
  69 struct vxlanhdr {
  70         __be32 vx_flags;
  71         __be32 vx_vni;
  72 };
  73
  74 /* UDP port for VXLAN traffic.
  75  * The IANA assigned port is 4789, but the Linux default is 8472
  76  * for compatibility with early adopters.
  77  */
  78 static unsigned short vxlan_port __read_mostly = 8472;
  79 module_param_named(udp_port, vxlan_port, ushort, 0444);
  80 MODULE_PARM_DESC(udp_port, "Destination UDP port");
  81
  82 static bool log_ecn_error = true;
  83 module_param(log_ecn_error, bool, 0644);
  84 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
  85
  86 static int vxlan_net_id;
  87
  88 static const u8 all_zeros_mac[ETH_ALEN];
  89
  90 /* per-network namespace private data for this module */
  91 struct vxlan_net {
  92         struct list_head  vxlan_list;
  93         struct hlist_head sock_list[PORT_HASH_SIZE];
  94         spinlock_t        sock_lock;
  95 };
  96
  97 union vxlan_addr {
  98         struct sockaddr_in sin;
  99         struct sockaddr_in6 sin6;
 100         struct sockaddr sa;
 101 };
 102
 103 struct vxlan_rdst {
 104         union vxlan_addr         remote_ip;
 105         __be16                   remote_port;
 106         u32                      remote_vni;
 107         u32                      remote_ifindex;
 108         struct list_head         list;
 109         struct rcu_head          rcu;
 110 };
 111
 112 /* Forwarding table entry */
 113 struct vxlan_fdb {
 114         struct hlist_node hlist;        /* linked list of entries */
 115         struct rcu_head   rcu;
 116         unsigned long     updated;      /* jiffies */
 117         unsigned long     used;
 118         struct list_head  remotes;
 119         u16               state;        /* see ndm_state */
 120         u8                flags;        /* see ndm_flags */
 121         u8                eth_addr[ETH_ALEN];
 122 };
 123
 124 /* Pseudo network device */
 125 struct vxlan_dev {
 126         struct hlist_node hlist;        /* vni hash table */
 127         struct list_head  next;         /* vxlan's per namespace list */
 128         struct vxlan_sock *vn_sock;     /* listening socket */
 129         struct net_device *dev;
 130         struct net        *net;         /* netns for packet i/o */
 131         struct vxlan_rdst default_dst;  /* default destination */
 132         union vxlan_addr  saddr;        /* source address */
 133         __be16            dst_port;
 134         __u16             port_min;     /* source port range */
 135         __u16             port_max;
 136         __u8              tos;          /* TOS override */
 137         __u8              ttl;
 138         u32               flags;        /* VXLAN_F_* in vxlan.h */
 139
 140         struct work_struct sock_work;
 141         struct work_struct igmp_join;
 142         struct work_struct igmp_leave;
 143
 144         unsigned long     age_interval;
 145         struct timer_list age_timer;
 146         spinlock_t        hash_lock;
 147         unsigned int      addrcnt;
 148         unsigned int      addrmax;
 149
 150         struct hlist_head fdb_head[FDB_HASH_SIZE];
 151 };
 152
 153 /* salt for hash table */
 154 static u32 vxlan_salt __read_mostly;
 155 static struct workqueue_struct *vxlan_wq;
 156
 157 static void vxlan_sock_work(struct work_struct *work);
 158
 159 #if IS_ENABLED(CONFIG_IPV6)
 160 static inline
 161 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
 162 {
 163        if (a->sa.sa_family != b->sa.sa_family)
 164                return false;
 165        if (a->sa.sa_family == AF_INET6)
 166                return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
 167        else
 168                return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
 169 }
 170
 171 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
 172 {
 173        if (ipa->sa.sa_family == AF_INET6)
 174                return ipv6_addr_any(&ipa->sin6.sin6_addr);
 175        else
 176                return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
 177 }
 178
 179 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
 180 {
 181        if (ipa->sa.sa_family == AF_INET6)
 182                return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr);
 183        else
 184                return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
 185 }
 186
 187 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
 188 {
 189        if (nla_len(nla) >= sizeof(struct in6_addr)) {
 190                nla_memcpy(&ip->sin6.sin6_addr, nla, sizeof(struct in6_addr));
 191                ip->sa.sa_family = AF_INET6;
 192                return 0;
 193        } else if (nla_len(nla) >= sizeof(__be32)) {
 194                ip->sin.sin_addr.s_addr = nla_get_be32(nla);
 195                ip->sa.sa_family = AF_INET;
 196                return 0;
 197        } else {
 198                return -EAFNOSUPPORT;
 199        }
 200 }
 201
 202 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
 203                              const union vxlan_addr *ip)
 204 {
 205        if (ip->sa.sa_family == AF_INET6)
 206                return nla_put(skb, attr, sizeof(struct in6_addr), &ip->sin6.sin6_addr);
 207        else
 208                return nla_put_be32(skb, attr, ip->sin.sin_addr.s_addr);
 209 }
 210
 211 #else /* !CONFIG_IPV6 */
 212
 213 static inline
 214 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
 215 {
 216        return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
 217 }
 218
 219 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
 220 {
 221        return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
 222 }
 223
 224 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
 225 {
 226        return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
 227 }
 228
 229 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
 230 {
 231        if (nla_len(nla) >= sizeof(struct in6_addr)) {
 232                return -EAFNOSUPPORT;
 233        } else if (nla_len(nla) >= sizeof(__be32)) {
 234                ip->sin.sin_addr.s_addr = nla_get_be32(nla);
 235                ip->sa.sa_family = AF_INET;
 236                return 0;
 237        } else {
 238                return -EAFNOSUPPORT;
 239        }
 240 }
 241
 242 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
 243                              const union vxlan_addr *ip)
 244 {
 245        return nla_put_be32(skb, attr, ip->sin.sin_addr.s_addr);
 246 }
 247 #endif
 248
 249 /* Virtual Network hash table head */
 250 static inline struct hlist_head *vni_head(struct vxlan_sock *vs, u32 id)
 251 {
 252         return &vs->vni_list[hash_32(id, VNI_HASH_BITS)];
 253 }
 254
 255 /* Socket hash table head */
 256 static inline struct hlist_head *vs_head(struct net *net, __be16 port)
 257 {
 258         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
 259
 260         return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
 261 }
 262
 263 /* First remote destination for a forwarding entry.
 264  * Guaranteed to be non-NULL because remotes are never deleted.
 265  */
 266 static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
 267 {
 268         return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
 269 }
 270
 271 static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
 272 {
 273         return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
 274 }
 275
 276 /* Find VXLAN socket based on network namespace and UDP port */
 277 static struct vxlan_sock *vxlan_find_sock(struct net *net, __be16 port)
 278 {
 279         struct vxlan_sock *vs;
 280
 281         hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
 282                 if (inet_sk(vs->sock->sk)->inet_sport == port)
 283                         return vs;
 284         }
 285         return NULL;
 286 }
 287
 288 static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, u32 id)
 289 {
 290         struct vxlan_dev *vxlan;
 291
 292         hlist_for_each_entry_rcu(vxlan, vni_head(vs, id), hlist) {
 293                 if (vxlan->default_dst.remote_vni == id)
 294                         return vxlan;
 295         }
 296
 297         return NULL;
 298 }
 299
 300 /* Look up VNI in a per net namespace table */
 301 static struct vxlan_dev *vxlan_find_vni(struct net *net, u32 id, __be16 port)
 302 {
 303         struct vxlan_sock *vs;
 304
 305         vs = vxlan_find_sock(net, port);
 306         if (!vs)
 307                 return NULL;
 308
 309         return vxlan_vs_find_vni(vs, id);
 310 }
 311
 312 /* Fill in neighbour message in skbuff. */
 313 static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
 314                           const struct vxlan_fdb *fdb,
 315                           u32 portid, u32 seq, int type, unsigned int flags,
 316                           const struct vxlan_rdst *rdst)
 317 {
 318         unsigned long now = jiffies;
 319         struct nda_cacheinfo ci;
 320         struct nlmsghdr *nlh;
 321         struct ndmsg *ndm;
 322         bool send_ip, send_eth;
 323
 324         nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
 325         if (nlh == NULL)
 326                 return -EMSGSIZE;
 327
 328         ndm = nlmsg_data(nlh);
 329         memset(ndm, 0, sizeof(*ndm));
 330
 331         send_eth = send_ip = true;
 332
 333         if (type == RTM_GETNEIGH) {
 334                 ndm->ndm_family = AF_INET;
 335                 send_ip = !vxlan_addr_any(&rdst->remote_ip);
 336                 send_eth = !is_zero_ether_addr(fdb->eth_addr);
 337         } else
 338                 ndm->ndm_family = AF_BRIDGE;
 339         ndm->ndm_state = fdb->state;
 340         ndm->ndm_ifindex = vxlan->dev->ifindex;
 341         ndm->ndm_flags = fdb->flags;
 342         ndm->ndm_type = NDA_DST;
 343
 344         if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
 345                 goto nla_put_failure;
 346
 347         if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
 348                 goto nla_put_failure;
 349
 350         if (rdst->remote_port && rdst->remote_port != vxlan->dst_port &&
 351             nla_put_be16(skb, NDA_PORT, rdst->remote_port))
 352                 goto nla_put_failure;
 353         if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
 354             nla_put_u32(skb, NDA_VNI, rdst->remote_vni))
 355                 goto nla_put_failure;
 356         if (rdst->remote_ifindex &&
 357             nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
 358                 goto nla_put_failure;
 359
 360         ci.ndm_used      = jiffies_to_clock_t(now - fdb->used);
 361         ci.ndm_confirmed = 0;
 362         ci.ndm_updated   = jiffies_to_clock_t(now - fdb->updated);
 363         ci.ndm_refcnt    = 0;
 364
 365         if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
 366                 goto nla_put_failure;
 367
 368         return nlmsg_end(skb, nlh);
 369
 370 nla_put_failure:
 371         nlmsg_cancel(skb, nlh);
 372         return -EMSGSIZE;
 373 }
 374
 375 static inline size_t vxlan_nlmsg_size(void)
 376 {
 377         return NLMSG_ALIGN(sizeof(struct ndmsg))
 378                 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
 379                 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
 380                 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
 381                 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
 382                 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
 383                 + nla_total_size(sizeof(struct nda_cacheinfo));
 384 }
 385
 386 static void vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
 387                              struct vxlan_rdst *rd, int type)
 388 {
 389         struct net *net = dev_net(vxlan->dev);
 390         struct sk_buff *skb;
 391         int err = -ENOBUFS;
 392
 393         skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
 394         if (skb == NULL)
 395                 goto errout;
 396
 397         err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
 398         if (err < 0) {
 399                 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
 400                 WARN_ON(err == -EMSGSIZE);
 401                 kfree_skb(skb);
 402                 goto errout;
 403         }
 404
 405         rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
 406         return;
 407 errout:
 408         if (err < 0)
 409                 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
 410 }
 411
 412 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
 413 {
 414         struct vxlan_dev *vxlan = netdev_priv(dev);
 415         struct vxlan_fdb f = {
 416                 .state = NUD_STALE,
 417         };
 418         struct vxlan_rdst remote = {
 419                 .remote_ip = *ipa, /* goes to NDA_DST */
 420                 .remote_vni = VXLAN_N_VID,
 421         };
 422
 423         vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
 424 }
 425
 426 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
 427 {
 428         struct vxlan_fdb f = {
 429                 .state = NUD_STALE,
 430         };
 431         struct vxlan_rdst remote = { };
 432
 433         memcpy(f.eth_addr, eth_addr, ETH_ALEN);
 434
 435         vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
 436 }
 437
 438 /* Hash Ethernet address */
 439 static u32 eth_hash(const unsigned char *addr)
 440 {
 441         u64 value = get_unaligned((u64 *)addr);
 442
 443         /* only want 6 bytes */
 444 #ifdef __BIG_ENDIAN
 445         value >>= 16;
 446 #else
 447         value <<= 16;
 448 #endif
 449         return hash_64(value, FDB_HASH_BITS);
 450 }
 451
 452 /* Hash chain to use given mac address */
 453 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
 454                                                 const u8 *mac)
 455 {
 456         return &vxlan->fdb_head[eth_hash(mac)];
 457 }
 458
 459 /* Look up Ethernet address in forwarding table */
 460 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
 461                                         const u8 *mac)
 462 {
 463         struct hlist_head *head = vxlan_fdb_head(vxlan, mac);
 464         struct vxlan_fdb *f;
 465
 466         hlist_for_each_entry_rcu(f, head, hlist) {
 467                 if (ether_addr_equal(mac, f->eth_addr))
 468                         return f;
 469         }
 470
 471         return NULL;
 472 }
 473
 474 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
 475                                         const u8 *mac)
 476 {
 477         struct vxlan_fdb *f;
 478
 479         f = __vxlan_find_mac(vxlan, mac);
 480         if (f)
 481                 f->used = jiffies;
 482
 483         return f;
 484 }
 485
 486 /* caller should hold vxlan->hash_lock */
 487 static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
 488                                               union vxlan_addr *ip, __be16 port,
 489                                               __u32 vni, __u32 ifindex)
 490 {
 491         struct vxlan_rdst *rd;
 492
 493         list_for_each_entry(rd, &f->remotes, list) {
 494                 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
 495                     rd->remote_port == port &&
 496                     rd->remote_vni == vni &&
 497                     rd->remote_ifindex == ifindex)
 498                         return rd;
 499         }
 500
 501         return NULL;
 502 }
 503
 504 /* Replace destination of unicast mac */
 505 static int vxlan_fdb_replace(struct vxlan_fdb *f,
 506                              union vxlan_addr *ip, __be16 port, __u32 vni, __u32 ifindex)
 507 {
 508         struct vxlan_rdst *rd;
 509
 510         rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
 511         if (rd)
 512                 return 0;
 513
 514         rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
 515         if (!rd)
 516                 return 0;
 517         rd->remote_ip = *ip;
 518         rd->remote_port = port;
 519         rd->remote_vni = vni;
 520         rd->remote_ifindex = ifindex;
 521         return 1;
 522 }
 523
 524 /* Add/update destinations for multicast */
 525 static int vxlan_fdb_append(struct vxlan_fdb *f,
 526                             union vxlan_addr *ip, __be16 port, __u32 vni,
 527                             __u32 ifindex, struct vxlan_rdst **rdp)
 528 {
 529         struct vxlan_rdst *rd;
 530
 531         rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
 532         if (rd)
 533                 return 0;
 534
 535         rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
 536         if (rd == NULL)
 537                 return -ENOBUFS;
 538         rd->remote_ip = *ip;
 539         rd->remote_port = port;
 540         rd->remote_vni = vni;
 541         rd->remote_ifindex = ifindex;
 542
 543         list_add_tail_rcu(&rd->list, &f->remotes);
 544
 545         *rdp = rd;
 546         return 1;
 547 }
 548
 549 static struct sk_buff **vxlan_gro_receive(struct sk_buff **head, struct sk_buff *skb)
 550 {
 551         struct sk_buff *p, **pp = NULL;
 552         struct vxlanhdr *vh, *vh2;
 553         struct ethhdr *eh, *eh2;
 554         unsigned int hlen, off_vx, off_eth;
 555         const struct packet_offload *ptype;
 556         __be16 type;
 557         int flush = 1;
 558
 559         off_vx = skb_gro_offset(skb);
 560         hlen = off_vx + sizeof(*vh);
 561         vh   = skb_gro_header_fast(skb, off_vx);
 562         if (skb_gro_header_hard(skb, hlen)) {
 563                 vh = skb_gro_header_slow(skb, hlen, off_vx);
 564                 if (unlikely(!vh))
 565                         goto out;
 566         }
 567         skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
 568         skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
 569
 570         off_eth = skb_gro_offset(skb);
 571         hlen = off_eth + sizeof(*eh);
 572         eh   = skb_gro_header_fast(skb, off_eth);
 573         if (skb_gro_header_hard(skb, hlen)) {
 574                 eh = skb_gro_header_slow(skb, hlen, off_eth);
 575                 if (unlikely(!eh))
 576                         goto out;
 577         }
 578
 579         flush = 0;
 580
 581         for (p = *head; p; p = p->next) {
 582                 if (!NAPI_GRO_CB(p)->same_flow)
 583                         continue;
 584
 585                 vh2 = (struct vxlanhdr *)(p->data + off_vx);
 586                 eh2 = (struct ethhdr   *)(p->data + off_eth);
 587                 if (vh->vx_vni != vh2->vx_vni || compare_ether_header(eh, eh2)) {
 588                         NAPI_GRO_CB(p)->same_flow = 0;
 589                         continue;
 590                 }
 591         }
 592
 593         type = eh->h_proto;
 594
 595         rcu_read_lock();
 596         ptype = gro_find_receive_by_type(type);
 597         if (ptype == NULL) {
 598                 flush = 1;
 599                 goto out_unlock;
 600         }
 601
 602         skb_gro_pull(skb, sizeof(*eh)); /* pull inner eth header */
 603         skb_gro_postpull_rcsum(skb, eh, sizeof(*eh));
 604         pp = ptype->callbacks.gro_receive(head, skb);
 605
 606 out_unlock:
 607         rcu_read_unlock();
 608 out:
 609         NAPI_GRO_CB(skb)->flush |= flush;
 610
 611         return pp;
 612 }
 613
 614 static int vxlan_gro_complete(struct sk_buff *skb, int nhoff)
 615 {
 616         struct ethhdr *eh;
 617         struct packet_offload *ptype;
 618         __be16 type;
 619         int vxlan_len  = sizeof(struct vxlanhdr) + sizeof(struct ethhdr);
 620         int err = -ENOSYS;
 621
 622         eh = (struct ethhdr *)(skb->data + nhoff + sizeof(struct vxlanhdr));
 623         type = eh->h_proto;
 624
 625         rcu_read_lock();
 626         ptype = gro_find_complete_by_type(type);
 627         if (ptype != NULL)
 628                 err = ptype->callbacks.gro_complete(skb, nhoff + vxlan_len);
 629
 630         rcu_read_unlock();
 631         return err;
 632 }
 633
 634 /* Notify netdevs that UDP port started listening */
 635 static void vxlan_notify_add_rx_port(struct vxlan_sock *vs)
 636 {
 637         struct net_device *dev;
 638         struct sock *sk = vs->sock->sk;
 639         struct net *net = sock_net(sk);
 640         sa_family_t sa_family = sk->sk_family;
 641         __be16 port = inet_sk(sk)->inet_sport;
 642         int err;
 643
 644         if (sa_family == AF_INET) {
 645                 err = udp_add_offload(&vs->udp_offloads);
 646                 if (err)
 647                         pr_warn("vxlan: udp_add_offload failed with status %d\n", err);
 648         }
 649
 650         rcu_read_lock();
 651         for_each_netdev_rcu(net, dev) {
 652                 if (dev->netdev_ops->ndo_add_vxlan_port)
 653                         dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
 654                                                             port);
 655         }
 656         rcu_read_unlock();
 657 }
 658
 659 /* Notify netdevs that UDP port is no more listening */
 660 static void vxlan_notify_del_rx_port(struct vxlan_sock *vs)
 661 {
 662         struct net_device *dev;
 663         struct sock *sk = vs->sock->sk;
 664         struct net *net = sock_net(sk);
 665         sa_family_t sa_family = sk->sk_family;
 666         __be16 port = inet_sk(sk)->inet_sport;
 667
 668         rcu_read_lock();
 669         for_each_netdev_rcu(net, dev) {
 670                 if (dev->netdev_ops->ndo_del_vxlan_port)
 671                         dev->netdev_ops->ndo_del_vxlan_port(dev, sa_family,
 672                                                             port);
 673         }
 674         rcu_read_unlock();
 675
 676         if (sa_family == AF_INET)
 677                 udp_del_offload(&vs->udp_offloads);
 678 }
 679
 680 /* Add new entry to forwarding table -- assumes lock held */
 681 static int vxlan_fdb_create(struct vxlan_dev *vxlan,
 682                             const u8 *mac, union vxlan_addr *ip,
 683                             __u16 state, __u16 flags,
 684                             __be16 port, __u32 vni, __u32 ifindex,
 685                             __u8 ndm_flags)
 686 {
 687         struct vxlan_rdst *rd = NULL;
 688         struct vxlan_fdb *f;
 689         int notify = 0;
 690
 691         f = __vxlan_find_mac(vxlan, mac);
 692         if (f) {
 693                 if (flags & NLM_F_EXCL) {
 694                         netdev_dbg(vxlan->dev,
 695                                    "lost race to create %pM\n", mac);
 696                         return -EEXIST;
 697                 }
 698                 if (f->state != state) {
 699                         f->state = state;
 700                         f->updated = jiffies;
 701                         notify = 1;
 702                 }
 703                 if (f->flags != ndm_flags) {
 704                         f->flags = ndm_flags;
 705                         f->updated = jiffies;
 706                         notify = 1;
 707                 }
 708                 if ((flags & NLM_F_REPLACE)) {
 709                         /* Only change unicasts */
 710                         if (!(is_multicast_ether_addr(f->eth_addr) ||
 711                              is_zero_ether_addr(f->eth_addr))) {
 712                                 int rc = vxlan_fdb_replace(f, ip, port, vni,
 713                                                            ifindex);
 714
 715                                 if (rc < 0)
 716                                         return rc;
 717                                 notify |= rc;
 718                         } else
 719                                 return -EOPNOTSUPP;
 720                 }
 721                 if ((flags & NLM_F_APPEND) &&
 722                     (is_multicast_ether_addr(f->eth_addr) ||
 723                      is_zero_ether_addr(f->eth_addr))) {
 724                         int rc = vxlan_fdb_append(f, ip, port, vni, ifindex,
 725                                                   &rd);
 726
 727                         if (rc < 0)
 728                                 return rc;
 729                         notify |= rc;
 730                 }
 731         } else {
 732                 if (!(flags & NLM_F_CREATE))
 733                         return -ENOENT;
 734
 735                 if (vxlan->addrmax && vxlan->addrcnt >= vxlan->addrmax)
 736                         return -ENOSPC;
 737
 738                 /* Disallow replace to add a multicast entry */
 739                 if ((flags & NLM_F_REPLACE) &&
 740                     (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
 741                         return -EOPNOTSUPP;
 742
 743                 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
 744                 f = kmalloc(sizeof(*f), GFP_ATOMIC);
 745                 if (!f)
 746                         return -ENOMEM;
 747
 748                 notify = 1;
 749                 f->state = state;
 750                 f->flags = ndm_flags;
 751                 f->updated = f->used = jiffies;
 752                 INIT_LIST_HEAD(&f->remotes);
 753                 memcpy(f->eth_addr, mac, ETH_ALEN);
 754
 755                 vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
 756
 757                 ++vxlan->addrcnt;
 758                 hlist_add_head_rcu(&f->hlist,
 759                                    vxlan_fdb_head(vxlan, mac));
 760         }
 761
 762         if (notify) {
 763                 if (rd == NULL)
 764                         rd = first_remote_rtnl(f);
 765                 vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH);
 766         }
 767
 768         return 0;
 769 }
 770
 771 static void vxlan_fdb_free(struct rcu_head *head)
 772 {
 773         struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
 774         struct vxlan_rdst *rd, *nd;
 775
 776         list_for_each_entry_safe(rd, nd, &f->remotes, list)
 777                 kfree(rd);
 778         kfree(f);
 779 }
 780
 781 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f)
 782 {
 783         netdev_dbg(vxlan->dev,
 784                     "delete %pM\n", f->eth_addr);
 785
 786         --vxlan->addrcnt;
 787         vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_DELNEIGH);
 788
 789         hlist_del_rcu(&f->hlist);
 790         call_rcu(&f->rcu, vxlan_fdb_free);
 791 }
 792
 793 static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
 794                            union vxlan_addr *ip, __be16 *port, u32 *vni, u32 *ifindex)
 795 {
 796         struct net *net = dev_net(vxlan->dev);
 797         int err;
 798
 799         if (tb[NDA_DST]) {
 800                 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
 801                 if (err)
 802                         return err;
 803         } else {
 804                 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
 805                 if (remote->sa.sa_family == AF_INET) {
 806                         ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
 807                         ip->sa.sa_family = AF_INET;
 808 #if IS_ENABLED(CONFIG_IPV6)
 809                 } else {
 810                         ip->sin6.sin6_addr = in6addr_any;
 811                         ip->sa.sa_family = AF_INET6;
 812 #endif
 813                 }
 814         }
 815
 816         if (tb[NDA_PORT]) {
 817                 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
 818                         return -EINVAL;
 819                 *port = nla_get_be16(tb[NDA_PORT]);
 820         } else {
 821                 *port = vxlan->dst_port;
 822         }
 823
 824         if (tb[NDA_VNI]) {
 825                 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
 826                         return -EINVAL;
 827                 *vni = nla_get_u32(tb[NDA_VNI]);
 828         } else {
 829                 *vni = vxlan->default_dst.remote_vni;
 830         }
 831
 832         if (tb[NDA_IFINDEX]) {
 833                 struct net_device *tdev;
 834
 835                 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
 836                         return -EINVAL;
 837                 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
 838                 tdev = __dev_get_by_index(net, *ifindex);
 839                 if (!tdev)
 840                         return -EADDRNOTAVAIL;
 841         } else {
 842                 *ifindex = 0;
 843         }
 844
 845         return 0;
 846 }
 847
 848 /* Add static entry (via netlink) */
 849 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
 850                          struct net_device *dev,
 851                          const unsigned char *addr, u16 flags)
 852 {
 853         struct vxlan_dev *vxlan = netdev_priv(dev);
 854         /* struct net *net = dev_net(vxlan->dev); */
 855         union vxlan_addr ip;
 856         __be16 port;
 857         u32 vni, ifindex;
 858         int err;
 859
 860         if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
 861                 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
 862                         ndm->ndm_state);
 863                 return -EINVAL;
 864         }
 865
 866         if (tb[NDA_DST] == NULL)
 867                 return -EINVAL;
 868
 869         err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
 870         if (err)
 871                 return err;
 872
 873         if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
 874                 return -EAFNOSUPPORT;
 875
 876         spin_lock_bh(&vxlan->hash_lock);
 877         err = vxlan_fdb_create(vxlan, addr, &ip, ndm->ndm_state, flags,
 878                                port, vni, ifindex, ndm->ndm_flags);
 879         spin_unlock_bh(&vxlan->hash_lock);
 880
 881         return err;
 882 }
 883
 884 /* Delete entry (via netlink) */
 885 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
 886                             struct net_device *dev,
 887                             const unsigned char *addr)
 888 {
 889         struct vxlan_dev *vxlan = netdev_priv(dev);
 890         struct vxlan_fdb *f;
 891         struct vxlan_rdst *rd = NULL;
 892         union vxlan_addr ip;
 893         __be16 port;
 894         u32 vni, ifindex;
 895         int err;
 896
 897         err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
 898         if (err)
 899                 return err;
 900
 901         err = -ENOENT;
 902
 903         spin_lock_bh(&vxlan->hash_lock);
 904         f = vxlan_find_mac(vxlan, addr);
 905         if (!f)
 906                 goto out;
 907
 908         if (!vxlan_addr_any(&ip)) {
 909                 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
 910                 if (!rd)
 911                         goto out;
 912         }
 913
 914         err = 0;
 915
 916         /* remove a destination if it's not the only one on the list,
 917          * otherwise destroy the fdb entry
 918          */
 919         if (rd && !list_is_singular(&f->remotes)) {
 920                 list_del_rcu(&rd->list);
 921                 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH);
 922                 kfree_rcu(rd, rcu);
 923                 goto out;
 924         }
 925
 926         vxlan_fdb_destroy(vxlan, f);
 927
 928 out:
 929         spin_unlock_bh(&vxlan->hash_lock);
 930
 931         return err;
 932 }
 933
 934 /* Dump forwarding table */
 935 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
 936                           struct net_device *dev, int idx)
 937 {
 938         struct vxlan_dev *vxlan = netdev_priv(dev);
 939         unsigned int h;
 940
 941         for (h = 0; h < FDB_HASH_SIZE; ++h) {
 942                 struct vxlan_fdb *f;
 943                 int err;
 944
 945                 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
 946                         struct vxlan_rdst *rd;
 947
 948                         if (idx < cb->args[0])
 949                                 goto skip;
 950
 951                         list_for_each_entry_rcu(rd, &f->remotes, list) {
 952                                 err = vxlan_fdb_info(skb, vxlan, f,
 953                                                      NETLINK_CB(cb->skb).portid,
 954                                                      cb->nlh->nlmsg_seq,
 955                                                      RTM_NEWNEIGH,
 956                                                      NLM_F_MULTI, rd);
 957                                 if (err < 0)
 958                                         goto out;
 959                         }
 960 skip:
 961                         ++idx;
 962                 }
 963         }
 964 out:
 965         return idx;
 966 }
 967
 968 /* Watch incoming packets to learn mapping between Ethernet address
 969  * and Tunnel endpoint.
 970  * Return true if packet is bogus and should be droppped.
 971  */
 972 static bool vxlan_snoop(struct net_device *dev,
 973                         union vxlan_addr *src_ip, const u8 *src_mac)
 974 {
 975         struct vxlan_dev *vxlan = netdev_priv(dev);
 976         struct vxlan_fdb *f;
 977
 978         f = vxlan_find_mac(vxlan, src_mac);
 979         if (likely(f)) {
 980                 struct vxlan_rdst *rdst = first_remote_rcu(f);
 981
 982                 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip)))
 983                         return false;
 984
 985                 /* Don't migrate static entries, drop packets */
 986                 if (f->state & NUD_NOARP)
 987                         return true;
 988
 989                 if (net_ratelimit())
 990                         netdev_info(dev,
 991                                     "%pM migrated from %pIS to %pIS\n",
 992                                     src_mac, &rdst->remote_ip, &src_ip);
 993
 994                 rdst->remote_ip = *src_ip;
 995                 f->updated = jiffies;
 996                 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH);
 997         } else {
 998                 /* learned new entry */
 999                 spin_lock(&vxlan->hash_lock);
1000
1001                 /* close off race between vxlan_flush and incoming packets */
1002                 if (netif_running(dev))
1003                         vxlan_fdb_create(vxlan, src_mac, src_ip,
1004                                          NUD_REACHABLE,
1005                                          NLM_F_EXCL|NLM_F_CREATE,
1006                                          vxlan->dst_port,
1007                                          vxlan->default_dst.remote_vni,
1008                                          0, NTF_SELF);
1009                 spin_unlock(&vxlan->hash_lock);
1010         }
1011
1012         return false;
1013 }
1014
1015 /* See if multicast group is already in use by other ID */
1016 static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
1017 {
1018         struct vxlan_dev *vxlan;
1019
1020         /* The vxlan_sock is only used by dev, leaving group has
1021          * no effect on other vxlan devices.
1022          */
1023         if (atomic_read(&dev->vn_sock->refcnt) == 1)
1024                 return false;
1025
1026         list_for_each_entry(vxlan, &vn->vxlan_list, next) {
1027                 if (!netif_running(vxlan->dev) || vxlan == dev)
1028                         continue;
1029
1030                 if (vxlan->vn_sock != dev->vn_sock)
1031                         continue;
1032
1033                 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
1034                                       &dev->default_dst.remote_ip))
1035                         continue;
1036
1037                 if (vxlan->default_dst.remote_ifindex !=
1038                     dev->default_dst.remote_ifindex)
1039                         continue;
1040
1041                 return true;
1042         }
1043
1044         return false;
1045 }
1046
1047 static void vxlan_sock_hold(struct vxlan_sock *vs)
1048 {
1049         atomic_inc(&vs->refcnt);
1050 }
1051
1052 void vxlan_sock_release(struct vxlan_sock *vs)
1053 {
1054         struct sock *sk = vs->sock->sk;
1055         struct net *net = sock_net(sk);
1056         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
1057
1058         if (!atomic_dec_and_test(&vs->refcnt))
1059                 return;
1060
1061         spin_lock(&vn->sock_lock);
1062         hlist_del_rcu(&vs->hlist);
1063         rcu_assign_sk_user_data(vs->sock->sk, NULL);
1064         vxlan_notify_del_rx_port(vs);
1065         spin_unlock(&vn->sock_lock);
1066
1067         queue_work(vxlan_wq, &vs->del_work);
1068 }
1069 EXPORT_SYMBOL_GPL(vxlan_sock_release);
1070
1071 /* Callback to update multicast group membership when first VNI on
1072  * multicast asddress is brought up
1073  * Done as workqueue because ip_mc_join_group acquires RTNL.
1074  */
1075 static void vxlan_igmp_join(struct work_struct *work)
1076 {
1077         struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, igmp_join);
1078         struct vxlan_sock *vs = vxlan->vn_sock;
1079         struct sock *sk = vs->sock->sk;
1080         union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1081         int ifindex = vxlan->default_dst.remote_ifindex;
1082
1083         lock_sock(sk);
1084         if (ip->sa.sa_family == AF_INET) {
1085                 struct ip_mreqn mreq = {
1086                         .imr_multiaddr.s_addr   = ip->sin.sin_addr.s_addr,
1087                         .imr_ifindex            = ifindex,
1088                 };
1089
1090                 ip_mc_join_group(sk, &mreq);
1091 #if IS_ENABLED(CONFIG_IPV6)
1092         } else {
1093                 ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1094                                              &ip->sin6.sin6_addr);
1095 #endif
1096         }
1097         release_sock(sk);
1098
1099         vxlan_sock_release(vs);
1100         dev_put(vxlan->dev);
1101 }
1102
1103 /* Inverse of vxlan_igmp_join when last VNI is brought down */
1104 static void vxlan_igmp_leave(struct work_struct *work)
1105 {
1106         struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, igmp_leave);
1107         struct vxlan_sock *vs = vxlan->vn_sock;
1108         struct sock *sk = vs->sock->sk;
1109         union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1110         int ifindex = vxlan->default_dst.remote_ifindex;
1111
1112         lock_sock(sk);
1113         if (ip->sa.sa_family == AF_INET) {
1114                 struct ip_mreqn mreq = {
1115                         .imr_multiaddr.s_addr   = ip->sin.sin_addr.s_addr,
1116                         .imr_ifindex            = ifindex,
1117                 };
1118
1119                 ip_mc_leave_group(sk, &mreq);
1120 #if IS_ENABLED(CONFIG_IPV6)
1121         } else {
1122                 ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1123                                              &ip->sin6.sin6_addr);
1124 #endif
1125         }
1126
1127         release_sock(sk);
1128
1129         vxlan_sock_release(vs);
1130         dev_put(vxlan->dev);
1131 }
1132
1133 /* Callback from net/ipv4/udp.c to receive packets */
1134 static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
1135 {
1136         struct vxlan_sock *vs;
1137         struct vxlanhdr *vxh;
1138
1139         /* Need Vxlan and inner Ethernet header to be present */
1140         if (!pskb_may_pull(skb, VXLAN_HLEN))
1141                 goto error;
1142
1143         /* Return packets with reserved bits set */
1144         vxh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1145         if (vxh->vx_flags != htonl(VXLAN_FLAGS) ||
1146             (vxh->vx_vni & htonl(0xff))) {
1147                 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1148                            ntohl(vxh->vx_flags), ntohl(vxh->vx_vni));
1149                 goto error;
1150         }
1151
1152         if (iptunnel_pull_header(skb, VXLAN_HLEN, htons(ETH_P_TEB)))
1153                 goto drop;
1154
1155         vs = rcu_dereference_sk_user_data(sk);
1156         if (!vs)
1157                 goto drop;
1158
1159         skb_pop_rcv_encapsulation(skb);
1160
1161         vs->rcv(vs, skb, vxh->vx_vni);
1162         return 0;
1163
1164 drop:
1165         /* Consume bad packet */
1166         kfree_skb(skb);
1167         return 0;
1168
1169 error:
1170         /* Return non vxlan pkt */
1171         return 1;
1172 }
1173
1174 static void vxlan_rcv(struct vxlan_sock *vs,
1175                       struct sk_buff *skb, __be32 vx_vni)
1176 {
1177         struct iphdr *oip = NULL;
1178         struct ipv6hdr *oip6 = NULL;
1179         struct vxlan_dev *vxlan;
1180         struct pcpu_sw_netstats *stats;
1181         union vxlan_addr saddr;
1182         __u32 vni;
1183         int err = 0;
1184         union vxlan_addr *remote_ip;
1185
1186         vni = ntohl(vx_vni) >> 8;
1187         /* Is this VNI defined? */
1188         vxlan = vxlan_vs_find_vni(vs, vni);
1189         if (!vxlan)
1190                 goto drop;
1191
1192         remote_ip = &vxlan->default_dst.remote_ip;
1193         skb_reset_mac_header(skb);
1194         skb_scrub_packet(skb, !net_eq(vxlan->net, dev_net(vxlan->dev)));
1195         skb->protocol = eth_type_trans(skb, vxlan->dev);
1196         skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1197
1198         /* Ignore packet loops (and multicast echo) */
1199         if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1200                 goto drop;
1201
1202         /* Re-examine inner Ethernet packet */
1203         if (remote_ip->sa.sa_family == AF_INET) {
1204                 oip = ip_hdr(skb);
1205                 saddr.sin.sin_addr.s_addr = oip->saddr;
1206                 saddr.sa.sa_family = AF_INET;
1207 #if IS_ENABLED(CONFIG_IPV6)
1208         } else {
1209                 oip6 = ipv6_hdr(skb);
1210                 saddr.sin6.sin6_addr = oip6->saddr;
1211                 saddr.sa.sa_family = AF_INET6;
1212 #endif
1213         }
1214
1215         if ((vxlan->flags & VXLAN_F_LEARN) &&
1216             vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source))
1217                 goto drop;
1218
1219         skb_reset_network_header(skb);
1220
1221         if (oip6)
1222                 err = IP6_ECN_decapsulate(oip6, skb);
1223         if (oip)
1224                 err = IP_ECN_decapsulate(oip, skb);
1225
1226         if (unlikely(err)) {
1227                 if (log_ecn_error) {
1228                         if (oip6)
1229                                 net_info_ratelimited("non-ECT from %pI6\n",
1230                                                      &oip6->saddr);
1231                         if (oip)
1232                                 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1233                                                      &oip->saddr, oip->tos);
1234                 }
1235                 if (err > 1) {
1236                         ++vxlan->dev->stats.rx_frame_errors;
1237                         ++vxlan->dev->stats.rx_errors;
1238                         goto drop;
1239                 }
1240         }
1241
1242         stats = this_cpu_ptr(vxlan->dev->tstats);
1243         u64_stats_update_begin(&stats->syncp);
1244         stats->rx_packets++;
1245         stats->rx_bytes += skb->len;
1246         u64_stats_update_end(&stats->syncp);
1247
1248         netif_rx(skb);
1249
1250         return;
1251 drop:
1252         /* Consume bad packet */
1253         kfree_skb(skb);
1254 }
1255
1256 static int arp_reduce(struct net_device *dev, struct sk_buff *skb)
1257 {
1258         struct vxlan_dev *vxlan = netdev_priv(dev);
1259         struct arphdr *parp;
1260         u8 *arpptr, *sha;
1261         __be32 sip, tip;
1262         struct neighbour *n;
1263
1264         if (dev->flags & IFF_NOARP)
1265                 goto out;
1266
1267         if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1268                 dev->stats.tx_dropped++;
1269                 goto out;
1270         }
1271         parp = arp_hdr(skb);
1272
1273         if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1274              parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1275             parp->ar_pro != htons(ETH_P_IP) ||
1276             parp->ar_op != htons(ARPOP_REQUEST) ||
1277             parp->ar_hln != dev->addr_len ||
1278             parp->ar_pln != 4)
1279                 goto out;
1280         arpptr = (u8 *)parp + sizeof(struct arphdr);
1281         sha = arpptr;
1282         arpptr += dev->addr_len;        /* sha */
1283         memcpy(&sip, arpptr, sizeof(sip));
1284         arpptr += sizeof(sip);
1285         arpptr += dev->addr_len;        /* tha */
1286         memcpy(&tip, arpptr, sizeof(tip));
1287
1288         if (ipv4_is_loopback(tip) ||
1289             ipv4_is_multicast(tip))
1290                 goto out;
1291
1292         n = neigh_lookup(&arp_tbl, &tip, dev);
1293
1294         if (n) {
1295                 struct vxlan_fdb *f;
1296                 struct sk_buff  *reply;
1297
1298                 if (!(n->nud_state & NUD_CONNECTED)) {
1299                         neigh_release(n);
1300                         goto out;
1301                 }
1302
1303                 f = vxlan_find_mac(vxlan, n->ha);
1304                 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1305                         /* bridge-local neighbor */
1306                         neigh_release(n);
1307                         goto out;
1308                 }
1309
1310                 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1311                                 n->ha, sha);
1312
1313                 neigh_release(n);
1314
1315                 if (reply == NULL)
1316                         goto out;
1317
1318                 skb_reset_mac_header(reply);
1319                 __skb_pull(reply, skb_network_offset(reply));
1320                 reply->ip_summed = CHECKSUM_UNNECESSARY;
1321                 reply->pkt_type = PACKET_HOST;
1322
1323                 if (netif_rx_ni(reply) == NET_RX_DROP)
1324                         dev->stats.rx_dropped++;
1325         } else if (vxlan->flags & VXLAN_F_L3MISS) {
1326                 union vxlan_addr ipa = {
1327                         .sin.sin_addr.s_addr = tip,
1328                         .sa.sa_family = AF_INET,
1329                 };
1330
1331                 vxlan_ip_miss(dev, &ipa);
1332         }
1333 out:
1334         consume_skb(skb);
1335         return NETDEV_TX_OK;
1336 }
1337
1338 #if IS_ENABLED(CONFIG_IPV6)
1339
1340 static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1341         struct neighbour *n, bool isrouter)
1342 {
1343         struct net_device *dev = request->dev;
1344         struct sk_buff *reply;
1345         struct nd_msg *ns, *na;
1346         struct ipv6hdr *pip6;
1347         u8 *daddr;
1348         int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1349         int ns_olen;
1350         int i, len;
1351
1352         if (dev == NULL)
1353                 return NULL;
1354
1355         len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1356                 sizeof(*na) + na_olen + dev->needed_tailroom;
1357         reply = alloc_skb(len, GFP_ATOMIC);
1358         if (reply == NULL)
1359                 return NULL;
1360
1361         reply->protocol = htons(ETH_P_IPV6);
1362         reply->dev = dev;
1363         skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1364         skb_push(reply, sizeof(struct ethhdr));
1365         skb_set_mac_header(reply, 0);
1366
1367         ns = (struct nd_msg *)skb_transport_header(request);
1368
1369         daddr = eth_hdr(request)->h_source;
1370         ns_olen = request->len - skb_transport_offset(request) - sizeof(*ns);
1371         for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1372                 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1373                         daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1374                         break;
1375                 }
1376         }
1377
1378         /* Ethernet header */
1379         ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1380         ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1381         eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1382         reply->protocol = htons(ETH_P_IPV6);
1383
1384         skb_pull(reply, sizeof(struct ethhdr));
1385         skb_set_network_header(reply, 0);
1386         skb_put(reply, sizeof(struct ipv6hdr));
1387
1388         /* IPv6 header */
1389
1390         pip6 = ipv6_hdr(reply);
1391         memset(pip6, 0, sizeof(struct ipv6hdr));
1392         pip6->version = 6;
1393         pip6->priority = ipv6_hdr(request)->priority;
1394         pip6->nexthdr = IPPROTO_ICMPV6;
1395         pip6->hop_limit = 255;
1396         pip6->daddr = ipv6_hdr(request)->saddr;
1397         pip6->saddr = *(struct in6_addr *)n->primary_key;
1398
1399         skb_pull(reply, sizeof(struct ipv6hdr));
1400         skb_set_transport_header(reply, 0);
1401
1402         na = (struct nd_msg *)skb_put(reply, sizeof(*na) + na_olen);
1403
1404         /* Neighbor Advertisement */
1405         memset(na, 0, sizeof(*na)+na_olen);
1406         na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1407         na->icmph.icmp6_router = isrouter;
1408         na->icmph.icmp6_override = 1;
1409         na->icmph.icmp6_solicited = 1;
1410         na->target = ns->target;
1411         ether_addr_copy(&na->opt[2], n->ha);
1412         na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1413         na->opt[1] = na_olen >> 3;
1414
1415         na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1416                 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1417                 csum_partial(na, sizeof(*na)+na_olen, 0));
1418
1419         pip6->payload_len = htons(sizeof(*na)+na_olen);
1420
1421         skb_push(reply, sizeof(struct ipv6hdr));
1422
1423         reply->ip_summed = CHECKSUM_UNNECESSARY;
1424
1425         return reply;
1426 }
1427
1428 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb)
1429 {
1430         struct vxlan_dev *vxlan = netdev_priv(dev);
1431         struct nd_msg *msg;
1432         const struct ipv6hdr *iphdr;
1433         const struct in6_addr *saddr, *daddr;
1434         struct neighbour *n;
1435         struct inet6_dev *in6_dev;
1436
1437         in6_dev = __in6_dev_get(dev);
1438         if (!in6_dev)
1439                 goto out;
1440
1441         if (!pskb_may_pull(skb, skb->len))
1442                 goto out;
1443
1444         iphdr = ipv6_hdr(skb);
1445         saddr = &iphdr->saddr;
1446         daddr = &iphdr->daddr;
1447
1448         msg = (struct nd_msg *)skb_transport_header(skb);
1449         if (msg->icmph.icmp6_code != 0 ||
1450             msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION)
1451                 goto out;
1452
1453         if (ipv6_addr_loopback(daddr) ||
1454             ipv6_addr_is_multicast(&msg->target))
1455                 goto out;
1456
1457         n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
1458
1459         if (n) {
1460                 struct vxlan_fdb *f;
1461                 struct sk_buff *reply;
1462
1463                 if (!(n->nud_state & NUD_CONNECTED)) {
1464                         neigh_release(n);
1465                         goto out;
1466                 }
1467
1468                 f = vxlan_find_mac(vxlan, n->ha);
1469                 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1470                         /* bridge-local neighbor */
1471                         neigh_release(n);
1472                         goto out;
1473                 }
1474
1475                 reply = vxlan_na_create(skb, n,
1476                                         !!(f ? f->flags & NTF_ROUTER : 0));
1477
1478                 neigh_release(n);
1479
1480                 if (reply == NULL)
1481                         goto out;
1482
1483                 if (netif_rx_ni(reply) == NET_RX_DROP)
1484                         dev->stats.rx_dropped++;
1485
1486         } else if (vxlan->flags & VXLAN_F_L3MISS) {
1487                 union vxlan_addr ipa = {
1488                         .sin6.sin6_addr = msg->target,
1489                         .sa.sa_family = AF_INET6,
1490                 };
1491
1492                 vxlan_ip_miss(dev, &ipa);
1493         }
1494
1495 out:
1496         consume_skb(skb);
1497         return NETDEV_TX_OK;
1498 }
1499 #endif
1500
1501 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
1502 {
1503         struct vxlan_dev *vxlan = netdev_priv(dev);
1504         struct neighbour *n;
1505
1506         if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
1507                 return false;
1508
1509         n = NULL;
1510         switch (ntohs(eth_hdr(skb)->h_proto)) {
1511         case ETH_P_IP:
1512         {
1513                 struct iphdr *pip;
1514
1515                 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1516                         return false;
1517                 pip = ip_hdr(skb);
1518                 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
1519                 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1520                         union vxlan_addr ipa = {
1521                                 .sin.sin_addr.s_addr = pip->daddr,
1522                                 .sa.sa_family = AF_INET,
1523                         };
1524
1525                         vxlan_ip_miss(dev, &ipa);
1526                         return false;
1527                 }
1528
1529                 break;
1530         }
1531 #if IS_ENABLED(CONFIG_IPV6)
1532         case ETH_P_IPV6:
1533         {
1534                 struct ipv6hdr *pip6;
1535
1536                 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
1537                         return false;
1538                 pip6 = ipv6_hdr(skb);
1539                 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
1540                 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1541                         union vxlan_addr ipa = {
1542                                 .sin6.sin6_addr = pip6->daddr,
1543                                 .sa.sa_family = AF_INET6,
1544                         };
1545
1546                         vxlan_ip_miss(dev, &ipa);
1547                         return false;
1548                 }
1549
1550                 break;
1551         }
1552 #endif
1553         default:
1554                 return false;
1555         }
1556
1557         if (n) {
1558                 bool diff;
1559
1560                 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
1561                 if (diff) {
1562                         memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
1563                                 dev->addr_len);
1564                         memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
1565                 }
1566                 neigh_release(n);
1567                 return diff;
1568         }
1569
1570         return false;
1571 }
1572
1573 static inline struct sk_buff *vxlan_handle_offloads(struct sk_buff *skb,
1574                                                     bool udp_csum)
1575 {
1576         int type = udp_csum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1577         return iptunnel_handle_offloads(skb, udp_csum, type);
1578 }
1579
1580 #if IS_ENABLED(CONFIG_IPV6)
1581 static int vxlan6_xmit_skb(struct vxlan_sock *vs,
1582                            struct dst_entry *dst, struct sk_buff *skb,
1583                            struct net_device *dev, struct in6_addr *saddr,
1584                            struct in6_addr *daddr, __u8 prio, __u8 ttl,
1585                            __be16 src_port, __be16 dst_port, __be32 vni,
1586                            bool xnet)
1587 {
1588         struct ipv6hdr *ip6h;
1589         struct vxlanhdr *vxh;
1590         struct udphdr *uh;
1591         int min_headroom;
1592         int err;
1593
1594         skb = vxlan_handle_offloads(skb, !udp_get_no_check6_tx(vs->sock->sk));
1595         if (IS_ERR(skb))
1596                 return -EINVAL;
1597
1598         skb_scrub_packet(skb, xnet);
1599
1600         min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
1601                         + VXLAN_HLEN + sizeof(struct ipv6hdr)
1602                         + (vlan_tx_tag_present(skb) ? VLAN_HLEN : 0);
1603
1604         /* Need space for new headers (invalidates iph ptr) */
1605         err = skb_cow_head(skb, min_headroom);
1606         if (unlikely(err))
1607                 return err;
1608
1609         if (vlan_tx_tag_present(skb)) {
1610                 if (WARN_ON(!__vlan_put_tag(skb,
1611                                             skb->vlan_proto,
1612                                             vlan_tx_tag_get(skb))))
1613                         return -ENOMEM;
1614
1615                 skb->vlan_tci = 0;
1616         }
1617
1618         vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1619         vxh->vx_flags = htonl(VXLAN_FLAGS);
1620         vxh->vx_vni = vni;
1621
1622         __skb_push(skb, sizeof(*uh));
1623         skb_reset_transport_header(skb);
1624         uh = udp_hdr(skb);
1625
1626         uh->dest = dst_port;
1627         uh->source = src_port;
1628
1629         uh->len = htons(skb->len);
1630
1631         memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1632         IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED |
1633                               IPSKB_REROUTED);
1634         skb_dst_set(skb, dst);
1635
1636         udp6_set_csum(udp_get_no_check6_tx(vs->sock->sk), skb,
1637                       saddr, daddr, skb->len);
1638
1639         __skb_push(skb, sizeof(*ip6h));
1640         skb_reset_network_header(skb);
1641         ip6h              = ipv6_hdr(skb);
1642         ip6h->version     = 6;
1643         ip6h->priority    = prio;
1644         ip6h->flow_lbl[0] = 0;
1645         ip6h->flow_lbl[1] = 0;
1646         ip6h->flow_lbl[2] = 0;
1647         ip6h->payload_len = htons(skb->len);
1648         ip6h->nexthdr     = IPPROTO_UDP;
1649         ip6h->hop_limit   = ttl;
1650         ip6h->daddr       = *daddr;
1651         ip6h->saddr       = *saddr;
1652
1653         ip6tunnel_xmit(skb, dev);
1654         return 0;
1655 }
1656 #endif
1657
1658 int vxlan_xmit_skb(struct vxlan_sock *vs,
1659                    struct rtable *rt, struct sk_buff *skb,
1660                    __be32 src, __be32 dst, __u8 tos, __u8 ttl, __be16 df,
1661                    __be16 src_port, __be16 dst_port, __be32 vni, bool xnet)
1662 {
1663         struct vxlanhdr *vxh;
1664         struct udphdr *uh;
1665         int min_headroom;
1666         int err;
1667
1668         skb = vxlan_handle_offloads(skb, !vs->sock->sk->sk_no_check_tx);
1669         if (IS_ERR(skb))
1670                 return -EINVAL;
1671
1672         min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
1673                         + VXLAN_HLEN + sizeof(struct iphdr)
1674                         + (vlan_tx_tag_present(skb) ? VLAN_HLEN : 0);
1675
1676         /* Need space for new headers (invalidates iph ptr) */
1677         err = skb_cow_head(skb, min_headroom);
1678         if (unlikely(err))
1679                 return err;
1680
1681         if (vlan_tx_tag_present(skb)) {
1682                 if (WARN_ON(!__vlan_put_tag(skb,
1683                                             skb->vlan_proto,
1684                                             vlan_tx_tag_get(skb))))
1685                         return -ENOMEM;
1686
1687                 skb->vlan_tci = 0;
1688         }
1689
1690         vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1691         vxh->vx_flags = htonl(VXLAN_FLAGS);
1692         vxh->vx_vni = vni;
1693
1694         __skb_push(skb, sizeof(*uh));
1695         skb_reset_transport_header(skb);
1696         uh = udp_hdr(skb);
1697
1698         uh->dest = dst_port;
1699         uh->source = src_port;
1700
1701         uh->len = htons(skb->len);
1702
1703         udp_set_csum(vs->sock->sk->sk_no_check_tx, skb,
1704                      src, dst, skb->len);
1705
1706         return iptunnel_xmit(vs->sock->sk, rt, skb, src, dst, IPPROTO_UDP,
1707                              tos, ttl, df, xnet);
1708 }
1709 EXPORT_SYMBOL_GPL(vxlan_xmit_skb);
1710
1711 /* Bypass encapsulation if the destination is local */
1712 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
1713                                struct vxlan_dev *dst_vxlan)
1714 {
1715         struct pcpu_sw_netstats *tx_stats, *rx_stats;
1716         union vxlan_addr loopback;
1717         union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
1718
1719         tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
1720         rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
1721         skb->pkt_type = PACKET_HOST;
1722         skb->encapsulation = 0;
1723         skb->dev = dst_vxlan->dev;
1724         __skb_pull(skb, skb_network_offset(skb));
1725
1726         if (remote_ip->sa.sa_family == AF_INET) {
1727                 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
1728                 loopback.sa.sa_family =  AF_INET;
1729 #if IS_ENABLED(CONFIG_IPV6)
1730         } else {
1731                 loopback.sin6.sin6_addr = in6addr_loopback;
1732                 loopback.sa.sa_family =  AF_INET6;
1733 #endif
1734         }
1735
1736         if (dst_vxlan->flags & VXLAN_F_LEARN)
1737                 vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source);
1738
1739         u64_stats_update_begin(&tx_stats->syncp);
1740         tx_stats->tx_packets++;
1741         tx_stats->tx_bytes += skb->len;
1742         u64_stats_update_end(&tx_stats->syncp);
1743
1744         if (netif_rx(skb) == NET_RX_SUCCESS) {
1745                 u64_stats_update_begin(&rx_stats->syncp);
1746                 rx_stats->rx_packets++;
1747                 rx_stats->rx_bytes += skb->len;
1748                 u64_stats_update_end(&rx_stats->syncp);
1749         } else {
1750                 skb->dev->stats.rx_dropped++;
1751         }
1752 }
1753
1754 static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
1755                            struct vxlan_rdst *rdst, bool did_rsc)
1756 {
1757         struct vxlan_dev *vxlan = netdev_priv(dev);
1758         struct rtable *rt = NULL;
1759         const struct iphdr *old_iph;
1760         struct flowi4 fl4;
1761         union vxlan_addr *dst;
1762         __be16 src_port = 0, dst_port;
1763         u32 vni;
1764         __be16 df = 0;
1765         __u8 tos, ttl;
1766         int err;
1767
1768         dst_port = rdst->remote_port ? rdst->remote_port : vxlan->dst_port;
1769         vni = rdst->remote_vni;
1770         dst = &rdst->remote_ip;
1771
1772         if (vxlan_addr_any(dst)) {
1773                 if (did_rsc) {
1774                         /* short-circuited back to local bridge */
1775                         vxlan_encap_bypass(skb, vxlan, vxlan);
1776                         return;
1777                 }
1778                 goto drop;
1779         }
1780
1781         old_iph = ip_hdr(skb);
1782
1783         ttl = vxlan->ttl;
1784         if (!ttl && vxlan_addr_multicast(dst))
1785                 ttl = 1;
1786
1787         tos = vxlan->tos;
1788         if (tos == 1)
1789                 tos = ip_tunnel_get_dsfield(old_iph, skb);
1790
1791         src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->port_min,
1792                                      vxlan->port_max, true);
1793
1794         if (dst->sa.sa_family == AF_INET) {
1795                 memset(&fl4, 0, sizeof(fl4));
1796                 fl4.flowi4_oif = rdst->remote_ifindex;
1797                 fl4.flowi4_tos = RT_TOS(tos);
1798                 fl4.daddr = dst->sin.sin_addr.s_addr;
1799                 fl4.saddr = vxlan->saddr.sin.sin_addr.s_addr;
1800
1801                 rt = ip_route_output_key(vxlan->net, &fl4);
1802                 if (IS_ERR(rt)) {
1803                         netdev_dbg(dev, "no route to %pI4\n",
1804                                    &dst->sin.sin_addr.s_addr);
1805                         dev->stats.tx_carrier_errors++;
1806                         goto tx_error;
1807                 }
1808
1809                 if (rt->dst.dev == dev) {
1810                         netdev_dbg(dev, "circular route to %pI4\n",
1811                                    &dst->sin.sin_addr.s_addr);
1812                         dev->stats.collisions++;
1813                         goto rt_tx_error;
1814                 }
1815
1816                 /* Bypass encapsulation if the destination is local */
1817                 if (rt->rt_flags & RTCF_LOCAL &&
1818                     !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
1819                         struct vxlan_dev *dst_vxlan;
1820
1821                         ip_rt_put(rt);
1822                         dst_vxlan = vxlan_find_vni(vxlan->net, vni, dst_port);
1823                         if (!dst_vxlan)
1824                                 goto tx_error;
1825                         vxlan_encap_bypass(skb, vxlan, dst_vxlan);
1826                         return;
1827                 }
1828
1829                 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
1830                 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
1831
1832                 err = vxlan_xmit_skb(vxlan->vn_sock, rt, skb,
1833                                      fl4.saddr, dst->sin.sin_addr.s_addr,
1834                                      tos, ttl, df, src_port, dst_port,
1835                                      htonl(vni << 8),
1836                                      !net_eq(vxlan->net, dev_net(vxlan->dev)));
1837
1838                 if (err < 0)
1839                         goto rt_tx_error;
1840                 iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
1841 #if IS_ENABLED(CONFIG_IPV6)
1842         } else {
1843                 struct sock *sk = vxlan->vn_sock->sock->sk;
1844                 struct dst_entry *ndst;
1845                 struct flowi6 fl6;
1846                 u32 flags;
1847
1848                 memset(&fl6, 0, sizeof(fl6));
1849                 fl6.flowi6_oif = rdst->remote_ifindex;
1850                 fl6.daddr = dst->sin6.sin6_addr;
1851                 fl6.saddr = vxlan->saddr.sin6.sin6_addr;
1852                 fl6.flowi6_proto = IPPROTO_UDP;
1853
1854                 if (ipv6_stub->ipv6_dst_lookup(sk, &ndst, &fl6)) {
1855                         netdev_dbg(dev, "no route to %pI6\n",
1856                                    &dst->sin6.sin6_addr);
1857                         dev->stats.tx_carrier_errors++;
1858                         goto tx_error;
1859                 }
1860
1861                 if (ndst->dev == dev) {
1862                         netdev_dbg(dev, "circular route to %pI6\n",
1863                                    &dst->sin6.sin6_addr);
1864                         dst_release(ndst);
1865                         dev->stats.collisions++;
1866                         goto tx_error;
1867                 }
1868
1869                 /* Bypass encapsulation if the destination is local */
1870                 flags = ((struct rt6_info *)ndst)->rt6i_flags;
1871                 if (flags & RTF_LOCAL &&
1872                     !(flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
1873                         struct vxlan_dev *dst_vxlan;
1874
1875                         dst_release(ndst);
1876                         dst_vxlan = vxlan_find_vni(vxlan->net, vni, dst_port);
1877                         if (!dst_vxlan)
1878                                 goto tx_error;
1879                         vxlan_encap_bypass(skb, vxlan, dst_vxlan);
1880                         return;
1881                 }
1882
1883                 ttl = ttl ? : ip6_dst_hoplimit(ndst);
1884
1885                 err = vxlan6_xmit_skb(vxlan->vn_sock, ndst, skb,
1886                                       dev, &fl6.saddr, &fl6.daddr, 0, ttl,
1887                                       src_port, dst_port, htonl(vni << 8),
1888                                       !net_eq(vxlan->net, dev_net(vxlan->dev)));
1889 #endif
1890         }
1891
1892         return;
1893
1894 drop:
1895         dev->stats.tx_dropped++;
1896         goto tx_free;
1897
1898 rt_tx_error:
1899         ip_rt_put(rt);
1900 tx_error:
1901         dev->stats.tx_errors++;
1902 tx_free:
1903         dev_kfree_skb(skb);
1904 }
1905
1906 /* Transmit local packets over Vxlan
1907  *
1908  * Outer IP header inherits ECN and DF from inner header.
1909  * Outer UDP destination is the VXLAN assigned port.
1910  *           source port is based on hash of flow
1911  */
1912 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
1913 {
1914         struct vxlan_dev *vxlan = netdev_priv(dev);
1915         struct ethhdr *eth;
1916         bool did_rsc = false;
1917         struct vxlan_rdst *rdst, *fdst = NULL;
1918         struct vxlan_fdb *f;
1919
1920         skb_reset_mac_header(skb);
1921         eth = eth_hdr(skb);
1922
1923         if ((vxlan->flags & VXLAN_F_PROXY)) {
1924                 if (ntohs(eth->h_proto) == ETH_P_ARP)
1925                         return arp_reduce(dev, skb);
1926 #if IS_ENABLED(CONFIG_IPV6)
1927                 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
1928                          skb->len >= sizeof(struct ipv6hdr) + sizeof(struct nd_msg) &&
1929                          ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
1930                                 struct nd_msg *msg;
1931
1932                                 msg = (struct nd_msg *)skb_transport_header(skb);
1933                                 if (msg->icmph.icmp6_code == 0 &&
1934                                     msg->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
1935                                         return neigh_reduce(dev, skb);
1936                 }
1937 #endif
1938         }
1939
1940         f = vxlan_find_mac(vxlan, eth->h_dest);
1941         did_rsc = false;
1942
1943         if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) &&
1944             (ntohs(eth->h_proto) == ETH_P_IP ||
1945              ntohs(eth->h_proto) == ETH_P_IPV6)) {
1946                 did_rsc = route_shortcircuit(dev, skb);
1947                 if (did_rsc)
1948                         f = vxlan_find_mac(vxlan, eth->h_dest);
1949         }
1950
1951         if (f == NULL) {
1952                 f = vxlan_find_mac(vxlan, all_zeros_mac);
1953                 if (f == NULL) {
1954                         if ((vxlan->flags & VXLAN_F_L2MISS) &&
1955                             !is_multicast_ether_addr(eth->h_dest))
1956                                 vxlan_fdb_miss(vxlan, eth->h_dest);
1957
1958                         dev->stats.tx_dropped++;
1959                         kfree_skb(skb);
1960                         return NETDEV_TX_OK;
1961                 }
1962         }
1963
1964         list_for_each_entry_rcu(rdst, &f->remotes, list) {
1965                 struct sk_buff *skb1;
1966
1967                 if (!fdst) {
1968                         fdst = rdst;
1969                         continue;
1970                 }
1971                 skb1 = skb_clone(skb, GFP_ATOMIC);
1972                 if (skb1)
1973                         vxlan_xmit_one(skb1, dev, rdst, did_rsc);
1974         }
1975
1976         if (fdst)
1977                 vxlan_xmit_one(skb, dev, fdst, did_rsc);
1978         else
1979                 kfree_skb(skb);
1980         return NETDEV_TX_OK;
1981 }
1982
1983 /* Walk the forwarding table and purge stale entries */
1984 static void vxlan_cleanup(unsigned long arg)
1985 {
1986         struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
1987         unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
1988         unsigned int h;
1989
1990         if (!netif_running(vxlan->dev))
1991                 return;
1992
1993         spin_lock_bh(&vxlan->hash_lock);
1994         for (h = 0; h < FDB_HASH_SIZE; ++h) {
1995                 struct hlist_node *p, *n;
1996                 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
1997                         struct vxlan_fdb *f
1998                                 = container_of(p, struct vxlan_fdb, hlist);
1999                         unsigned long timeout;
2000
2001                         if (f->state & NUD_PERMANENT)
2002                                 continue;
2003
2004                         timeout = f->used + vxlan->age_interval * HZ;
2005                         if (time_before_eq(timeout, jiffies)) {
2006                                 netdev_dbg(vxlan->dev,
2007                                            "garbage collect %pM\n",
2008                                            f->eth_addr);
2009                                 f->state = NUD_STALE;
2010                                 vxlan_fdb_destroy(vxlan, f);
2011                         } else if (time_before(timeout, next_timer))
2012                                 next_timer = timeout;
2013                 }
2014         }
2015         spin_unlock_bh(&vxlan->hash_lock);
2016
2017         mod_timer(&vxlan->age_timer, next_timer);
2018 }
2019
2020 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan)
2021 {
2022         __u32 vni = vxlan->default_dst.remote_vni;
2023
2024         vxlan->vn_sock = vs;
2025         hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
2026 }
2027
2028 /* Setup stats when device is created */
2029 static int vxlan_init(struct net_device *dev)
2030 {
2031         struct vxlan_dev *vxlan = netdev_priv(dev);
2032         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2033         struct vxlan_sock *vs;
2034
2035         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2036         if (!dev->tstats)
2037                 return -ENOMEM;
2038
2039         spin_lock(&vn->sock_lock);
2040         vs = vxlan_find_sock(vxlan->net, vxlan->dst_port);
2041         if (vs) {
2042                 /* If we have a socket with same port already, reuse it */
2043                 atomic_inc(&vs->refcnt);
2044                 vxlan_vs_add_dev(vs, vxlan);
2045         } else {
2046                 /* otherwise make new socket outside of RTNL */
2047                 dev_hold(dev);
2048                 queue_work(vxlan_wq, &vxlan->sock_work);
2049         }
2050         spin_unlock(&vn->sock_lock);
2051
2052         return 0;
2053 }
2054
2055 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan)
2056 {
2057         struct vxlan_fdb *f;
2058
2059         spin_lock_bh(&vxlan->hash_lock);
2060         f = __vxlan_find_mac(vxlan, all_zeros_mac);
2061         if (f)
2062                 vxlan_fdb_destroy(vxlan, f);
2063         spin_unlock_bh(&vxlan->hash_lock);
2064 }
2065
2066 static void vxlan_uninit(struct net_device *dev)
2067 {
2068         struct vxlan_dev *vxlan = netdev_priv(dev);
2069         struct vxlan_sock *vs = vxlan->vn_sock;
2070
2071         vxlan_fdb_delete_default(vxlan);
2072
2073         if (vs)
2074                 vxlan_sock_release(vs);
2075         free_percpu(dev->tstats);
2076 }
2077
2078 /* Start ageing timer and join group when device is brought up */
2079 static int vxlan_open(struct net_device *dev)
2080 {
2081         struct vxlan_dev *vxlan = netdev_priv(dev);
2082         struct vxlan_sock *vs = vxlan->vn_sock;
2083
2084         /* socket hasn't been created */
2085         if (!vs)
2086                 return -ENOTCONN;
2087
2088         if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
2089                 vxlan_sock_hold(vs);
2090                 dev_hold(dev);
2091                 queue_work(vxlan_wq, &vxlan->igmp_join);
2092         }
2093
2094         if (vxlan->age_interval)
2095                 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2096
2097         return 0;
2098 }
2099
2100 /* Purge the forwarding table */
2101 static void vxlan_flush(struct vxlan_dev *vxlan)
2102 {
2103         unsigned int h;
2104
2105         spin_lock_bh(&vxlan->hash_lock);
2106         for (h = 0; h < FDB_HASH_SIZE; ++h) {
2107                 struct hlist_node *p, *n;
2108                 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2109                         struct vxlan_fdb *f
2110                                 = container_of(p, struct vxlan_fdb, hlist);
2111                         /* the all_zeros_mac entry is deleted at vxlan_uninit */
2112                         if (!is_zero_ether_addr(f->eth_addr))
2113                                 vxlan_fdb_destroy(vxlan, f);
2114                 }
2115         }
2116         spin_unlock_bh(&vxlan->hash_lock);
2117 }
2118
2119 /* Cleanup timer and forwarding table on shutdown */
2120 static int vxlan_stop(struct net_device *dev)
2121 {
2122         struct vxlan_dev *vxlan = netdev_priv(dev);
2123         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2124         struct vxlan_sock *vs = vxlan->vn_sock;
2125
2126         if (vs && vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
2127             !vxlan_group_used(vn, vxlan)) {
2128                 vxlan_sock_hold(vs);
2129                 dev_hold(dev);
2130                 queue_work(vxlan_wq, &vxlan->igmp_leave);
2131         }
2132
2133         del_timer_sync(&vxlan->age_timer);
2134
2135         vxlan_flush(vxlan);
2136
2137         return 0;
2138 }
2139
2140 /* Stub, nothing needs to be done. */
2141 static void vxlan_set_multicast_list(struct net_device *dev)
2142 {
2143 }
2144
2145 static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2146 {
2147         struct vxlan_dev *vxlan = netdev_priv(dev);
2148         struct vxlan_rdst *dst = &vxlan->default_dst;
2149         struct net_device *lowerdev;
2150         int max_mtu;
2151
2152         lowerdev = __dev_get_by_index(vxlan->net, dst->remote_ifindex);
2153         if (lowerdev == NULL)
2154                 return eth_change_mtu(dev, new_mtu);
2155
2156         if (dst->remote_ip.sa.sa_family == AF_INET6)
2157                 max_mtu = lowerdev->mtu - VXLAN6_HEADROOM;
2158         else
2159                 max_mtu = lowerdev->mtu - VXLAN_HEADROOM;
2160
2161         if (new_mtu < 68 || new_mtu > max_mtu)
2162                 return -EINVAL;
2163
2164         dev->mtu = new_mtu;
2165         return 0;
2166 }
2167
2168 static const struct net_device_ops vxlan_netdev_ops = {
2169         .ndo_init               = vxlan_init,
2170         .ndo_uninit             = vxlan_uninit,
2171         .ndo_open               = vxlan_open,
2172         .ndo_stop               = vxlan_stop,
2173         .ndo_start_xmit         = vxlan_xmit,
2174         .ndo_get_stats64        = ip_tunnel_get_stats64,
2175         .ndo_set_rx_mode        = vxlan_set_multicast_list,
2176         .ndo_change_mtu         = vxlan_change_mtu,
2177         .ndo_validate_addr      = eth_validate_addr,
2178         .ndo_set_mac_address    = eth_mac_addr,
2179         .ndo_fdb_add            = vxlan_fdb_add,
2180         .ndo_fdb_del            = vxlan_fdb_delete,
2181         .ndo_fdb_dump           = vxlan_fdb_dump,
2182 };
2183
2184 /* Info for udev, that this is a virtual tunnel endpoint */
2185 static struct device_type vxlan_type = {
2186         .name = "vxlan",
2187 };
2188
2189 /* Calls the ndo_add_vxlan_port of the caller in order to
2190  * supply the listening VXLAN udp ports. Callers are expected
2191  * to implement the ndo_add_vxlan_port.
2192  */
2193 void vxlan_get_rx_port(struct net_device *dev)
2194 {
2195         struct vxlan_sock *vs;
2196         struct net *net = dev_net(dev);
2197         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2198         sa_family_t sa_family;
2199         __be16 port;
2200         unsigned int i;
2201
2202         spin_lock(&vn->sock_lock);
2203         for (i = 0; i < PORT_HASH_SIZE; ++i) {
2204                 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
2205                         port = inet_sk(vs->sock->sk)->inet_sport;
2206                         sa_family = vs->sock->sk->sk_family;
2207                         dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
2208                                                             port);
2209                 }
2210         }
2211         spin_unlock(&vn->sock_lock);
2212 }
2213 EXPORT_SYMBOL_GPL(vxlan_get_rx_port);
2214
2215 /* Initialize the device structure. */
2216 static void vxlan_setup(struct net_device *dev)
2217 {
2218         struct vxlan_dev *vxlan = netdev_priv(dev);
2219         unsigned int h;
2220
2221         eth_hw_addr_random(dev);
2222         ether_setup(dev);
2223         if (vxlan->default_dst.remote_ip.sa.sa_family == AF_INET6)
2224                 dev->needed_headroom = ETH_HLEN + VXLAN6_HEADROOM;
2225         else
2226                 dev->needed_headroom = ETH_HLEN + VXLAN_HEADROOM;
2227
2228         dev->netdev_ops = &vxlan_netdev_ops;
2229         dev->destructor = free_netdev;
2230         SET_NETDEV_DEVTYPE(dev, &vxlan_type);
2231
2232         dev->tx_queue_len = 0;
2233         dev->features   |= NETIF_F_LLTX;
2234         dev->features   |= NETIF_F_SG | NETIF_F_HW_CSUM;
2235         dev->features   |= NETIF_F_RXCSUM;
2236         dev->features   |= NETIF_F_GSO_SOFTWARE;
2237
2238         dev->vlan_features = dev->features;
2239         dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2240         dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
2241         dev->hw_features |= NETIF_F_GSO_SOFTWARE;
2242         dev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2243         dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
2244         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2245
2246         INIT_LIST_HEAD(&vxlan->next);
2247         spin_lock_init(&vxlan->hash_lock);
2248         INIT_WORK(&vxlan->igmp_join, vxlan_igmp_join);
2249         INIT_WORK(&vxlan->igmp_leave, vxlan_igmp_leave);
2250         INIT_WORK(&vxlan->sock_work, vxlan_sock_work);
2251
2252         init_timer_deferrable(&vxlan->age_timer);
2253         vxlan->age_timer.function = vxlan_cleanup;
2254         vxlan->age_timer.data = (unsigned long) vxlan;
2255
2256         vxlan->dst_port = htons(vxlan_port);
2257
2258         vxlan->dev = dev;
2259
2260         for (h = 0; h < FDB_HASH_SIZE; ++h)
2261                 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
2262 }
2263
2264 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
2265         [IFLA_VXLAN_ID]         = { .type = NLA_U32 },
2266         [IFLA_VXLAN_GROUP]      = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
2267         [IFLA_VXLAN_GROUP6]     = { .len = sizeof(struct in6_addr) },
2268         [IFLA_VXLAN_LINK]       = { .type = NLA_U32 },
2269         [IFLA_VXLAN_LOCAL]      = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
2270         [IFLA_VXLAN_LOCAL6]     = { .len = sizeof(struct in6_addr) },
2271         [IFLA_VXLAN_TOS]        = { .type = NLA_U8 },
2272         [IFLA_VXLAN_TTL]        = { .type = NLA_U8 },
2273         [IFLA_VXLAN_LEARNING]   = { .type = NLA_U8 },
2274         [IFLA_VXLAN_AGEING]     = { .type = NLA_U32 },
2275         [IFLA_VXLAN_LIMIT]      = { .type = NLA_U32 },
2276         [IFLA_VXLAN_PORT_RANGE] = { .len  = sizeof(struct ifla_vxlan_port_range) },
2277         [IFLA_VXLAN_PROXY]      = { .type = NLA_U8 },
2278         [IFLA_VXLAN_RSC]        = { .type = NLA_U8 },
2279         [IFLA_VXLAN_L2MISS]     = { .type = NLA_U8 },
2280         [IFLA_VXLAN_L3MISS]     = { .type = NLA_U8 },
2281         [IFLA_VXLAN_PORT]       = { .type = NLA_U16 },
2282 };
2283
2284 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
2285 {
2286         if (tb[IFLA_ADDRESS]) {
2287                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
2288                         pr_debug("invalid link address (not ethernet)\n");
2289                         return -EINVAL;
2290                 }
2291
2292                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
2293                         pr_debug("invalid all zero ethernet address\n");
2294                         return -EADDRNOTAVAIL;
2295                 }
2296         }
2297
2298         if (!data)
2299                 return -EINVAL;
2300
2301         if (data[IFLA_VXLAN_ID]) {
2302                 __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
2303                 if (id >= VXLAN_VID_MASK)
2304                         return -ERANGE;
2305         }
2306
2307         if (data[IFLA_VXLAN_PORT_RANGE]) {
2308                 const struct ifla_vxlan_port_range *p
2309                         = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2310
2311                 if (ntohs(p->high) < ntohs(p->low)) {
2312                         pr_debug("port range %u .. %u not valid\n",
2313                                  ntohs(p->low), ntohs(p->high));
2314                         return -EINVAL;
2315                 }
2316         }
2317
2318         return 0;
2319 }
2320
2321 static void vxlan_get_drvinfo(struct net_device *netdev,
2322                               struct ethtool_drvinfo *drvinfo)
2323 {
2324         strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
2325         strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
2326 }
2327
2328 static const struct ethtool_ops vxlan_ethtool_ops = {
2329         .get_drvinfo    = vxlan_get_drvinfo,
2330         .get_link       = ethtool_op_get_link,
2331 };
2332
2333 static void vxlan_del_work(struct work_struct *work)
2334 {
2335         struct vxlan_sock *vs = container_of(work, struct vxlan_sock, del_work);
2336
2337         sk_release_kernel(vs->sock->sk);
2338         kfree_rcu(vs, rcu);
2339 }
2340
2341 #if IS_ENABLED(CONFIG_IPV6)
2342 /* Create UDP socket for encapsulation receive. AF_INET6 socket
2343  * could be used for both IPv4 and IPv6 communications, but
2344  * users may set bindv6only=1.
2345  */
2346 static struct socket *create_v6_sock(struct net *net, __be16 port, u32 flags)
2347 {
2348         struct sock *sk;
2349         struct socket *sock;
2350         struct sockaddr_in6 vxlan_addr = {
2351                 .sin6_family = AF_INET6,
2352                 .sin6_port = port,
2353         };
2354         int rc, val = 1;
2355
2356         rc = sock_create_kern(AF_INET6, SOCK_DGRAM, IPPROTO_UDP, &sock);
2357         if (rc < 0) {
2358                 pr_debug("UDPv6 socket create failed\n");
2359                 return ERR_PTR(rc);
2360         }
2361
2362         /* Put in proper namespace */
2363         sk = sock->sk;
2364         sk_change_net(sk, net);
2365
2366         kernel_setsockopt(sock, SOL_IPV6, IPV6_V6ONLY,
2367                           (char *)&val, sizeof(val));
2368         rc = kernel_bind(sock, (struct sockaddr *)&vxlan_addr,
2369                          sizeof(struct sockaddr_in6));
2370         if (rc < 0) {
2371                 pr_debug("bind for UDPv6 socket %pI6:%u (%d)\n",
2372                          &vxlan_addr.sin6_addr, ntohs(vxlan_addr.sin6_port), rc);
2373                 sk_release_kernel(sk);
2374                 return ERR_PTR(rc);
2375         }
2376         /* At this point, IPv6 module should have been loaded in
2377          * sock_create_kern().
2378          */
2379         BUG_ON(!ipv6_stub);
2380
2381         /* Disable multicast loopback */
2382         inet_sk(sk)->mc_loop = 0;
2383
2384         if (flags & VXLAN_F_UDP_ZERO_CSUM6_TX)
2385                 udp_set_no_check6_tx(sk, true);
2386
2387         if (flags & VXLAN_F_UDP_ZERO_CSUM6_RX)
2388                 udp_set_no_check6_rx(sk, true);
2389
2390         return sock;
2391 }
2392
2393 #else
2394
2395 static struct socket *create_v6_sock(struct net *net, __be16 port, u32 flags)
2396 {
2397                 return ERR_PTR(-EPFNOSUPPORT);
2398 }
2399 #endif
2400
2401 static struct socket *create_v4_sock(struct net *net, __be16 port, u32 flags)
2402 {
2403         struct sock *sk;
2404         struct socket *sock;
2405         struct sockaddr_in vxlan_addr = {
2406                 .sin_family = AF_INET,
2407                 .sin_addr.s_addr = htonl(INADDR_ANY),
2408                 .sin_port = port,
2409         };
2410         int rc;
2411
2412         /* Create UDP socket for encapsulation receive. */
2413         rc = sock_create_kern(AF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock);
2414         if (rc < 0) {
2415                 pr_debug("UDP socket create failed\n");
2416                 return ERR_PTR(rc);
2417         }
2418
2419         /* Put in proper namespace */
2420         sk = sock->sk;
2421         sk_change_net(sk, net);
2422
2423         rc = kernel_bind(sock, (struct sockaddr *) &vxlan_addr,
2424                          sizeof(vxlan_addr));
2425         if (rc < 0) {
2426                 pr_debug("bind for UDP socket %pI4:%u (%d)\n",
2427                          &vxlan_addr.sin_addr, ntohs(vxlan_addr.sin_port), rc);
2428                 sk_release_kernel(sk);
2429                 return ERR_PTR(rc);
2430         }
2431
2432         /* Disable multicast loopback */
2433         inet_sk(sk)->mc_loop = 0;
2434
2435         if (!(flags & VXLAN_F_UDP_CSUM))
2436                 sock->sk->sk_no_check_tx = 1;
2437
2438         return sock;
2439 }
2440
2441 /* Create new listen socket if needed */
2442 static struct vxlan_sock *vxlan_socket_create(struct net *net, __be16 port,
2443                                               vxlan_rcv_t *rcv, void *data,
2444                                               u32 flags)
2445 {
2446         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2447         struct vxlan_sock *vs;
2448         struct socket *sock;
2449         struct sock *sk;
2450         unsigned int h;
2451         bool ipv6 = !!(flags & VXLAN_F_IPV6);
2452
2453         vs = kzalloc(sizeof(*vs), GFP_KERNEL);
2454         if (!vs)
2455                 return ERR_PTR(-ENOMEM);
2456
2457         for (h = 0; h < VNI_HASH_SIZE; ++h)
2458                 INIT_HLIST_HEAD(&vs->vni_list[h]);
2459
2460         INIT_WORK(&vs->del_work, vxlan_del_work);
2461
2462         if (ipv6)
2463                 sock = create_v6_sock(net, port, flags);
2464         else
2465                 sock = create_v4_sock(net, port, flags);
2466         if (IS_ERR(sock)) {
2467                 kfree(vs);
2468                 return ERR_CAST(sock);
2469         }
2470
2471         vs->sock = sock;
2472         sk = sock->sk;
2473         atomic_set(&vs->refcnt, 1);
2474         vs->rcv = rcv;
2475         vs->data = data;
2476         rcu_assign_sk_user_data(vs->sock->sk, vs);
2477
2478         /* Initialize the vxlan udp offloads structure */
2479         vs->udp_offloads.port = port;
2480         vs->udp_offloads.callbacks.gro_receive  = vxlan_gro_receive;
2481         vs->udp_offloads.callbacks.gro_complete = vxlan_gro_complete;
2482
2483         spin_lock(&vn->sock_lock);
2484         hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
2485         vxlan_notify_add_rx_port(vs);
2486         spin_unlock(&vn->sock_lock);
2487
2488         /* Mark socket as an encapsulation socket. */
2489         udp_sk(sk)->encap_type = 1;
2490         udp_sk(sk)->encap_rcv = vxlan_udp_encap_recv;
2491 #if IS_ENABLED(CONFIG_IPV6)
2492         if (ipv6)
2493                 ipv6_stub->udpv6_encap_enable();
2494         else
2495 #endif
2496                 udp_encap_enable();
2497
2498         return vs;
2499 }
2500
2501 struct vxlan_sock *vxlan_sock_add(struct net *net, __be16 port,
2502                                   vxlan_rcv_t *rcv, void *data,
2503                                   bool no_share, u32 flags)
2504 {
2505         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2506         struct vxlan_sock *vs;
2507
2508         vs = vxlan_socket_create(net, port, rcv, data, flags);
2509         if (!IS_ERR(vs))
2510                 return vs;
2511
2512         if (no_share)   /* Return error if sharing is not allowed. */
2513                 return vs;
2514
2515         spin_lock(&vn->sock_lock);
2516         vs = vxlan_find_sock(net, port);
2517         if (vs) {
2518                 if (vs->rcv == rcv)
2519                         atomic_inc(&vs->refcnt);
2520                 else
2521                         vs = ERR_PTR(-EBUSY);
2522         }
2523         spin_unlock(&vn->sock_lock);
2524
2525         if (!vs)
2526                 vs = ERR_PTR(-EINVAL);
2527
2528         return vs;
2529 }
2530 EXPORT_SYMBOL_GPL(vxlan_sock_add);
2531
2532 /* Scheduled at device creation to bind to a socket */
2533 static void vxlan_sock_work(struct work_struct *work)
2534 {
2535         struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, sock_work);
2536         struct net *net = vxlan->net;
2537         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2538         __be16 port = vxlan->dst_port;
2539         struct vxlan_sock *nvs;
2540
2541         nvs = vxlan_sock_add(net, port, vxlan_rcv, NULL, false, vxlan->flags);
2542         spin_lock(&vn->sock_lock);
2543         if (!IS_ERR(nvs))
2544                 vxlan_vs_add_dev(nvs, vxlan);
2545         spin_unlock(&vn->sock_lock);
2546
2547         dev_put(vxlan->dev);
2548 }
2549
2550 static int vxlan_newlink(struct net *net, struct net_device *dev,
2551                          struct nlattr *tb[], struct nlattr *data[])
2552 {
2553         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2554         struct vxlan_dev *vxlan = netdev_priv(dev);
2555         struct vxlan_rdst *dst = &vxlan->default_dst;
2556         __u32 vni;
2557         int err;
2558         bool use_ipv6 = false;
2559
2560         if (!data[IFLA_VXLAN_ID])
2561                 return -EINVAL;
2562
2563         vxlan->net = dev_net(dev);
2564
2565         vni = nla_get_u32(data[IFLA_VXLAN_ID]);
2566         dst->remote_vni = vni;
2567
2568         /* Unless IPv6 is explicitly requested, assume IPv4 */
2569         dst->remote_ip.sa.sa_family = AF_INET;
2570         if (data[IFLA_VXLAN_GROUP]) {
2571                 dst->remote_ip.sin.sin_addr.s_addr = nla_get_be32(data[IFLA_VXLAN_GROUP]);
2572         } else if (data[IFLA_VXLAN_GROUP6]) {
2573                 if (!IS_ENABLED(CONFIG_IPV6))
2574                         return -EPFNOSUPPORT;
2575
2576                 nla_memcpy(&dst->remote_ip.sin6.sin6_addr, data[IFLA_VXLAN_GROUP6],
2577                            sizeof(struct in6_addr));
2578                 dst->remote_ip.sa.sa_family = AF_INET6;
2579                 use_ipv6 = true;
2580         }
2581
2582         if (data[IFLA_VXLAN_LOCAL]) {
2583                 vxlan->saddr.sin.sin_addr.s_addr = nla_get_be32(data[IFLA_VXLAN_LOCAL]);
2584                 vxlan->saddr.sa.sa_family = AF_INET;
2585         } else if (data[IFLA_VXLAN_LOCAL6]) {
2586                 if (!IS_ENABLED(CONFIG_IPV6))
2587                         return -EPFNOSUPPORT;
2588
2589                 /* TODO: respect scope id */
2590                 nla_memcpy(&vxlan->saddr.sin6.sin6_addr, data[IFLA_VXLAN_LOCAL6],
2591                            sizeof(struct in6_addr));
2592                 vxlan->saddr.sa.sa_family = AF_INET6;
2593                 use_ipv6 = true;
2594         }
2595
2596         if (data[IFLA_VXLAN_LINK] &&
2597             (dst->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]))) {
2598                 struct net_device *lowerdev
2599                          = __dev_get_by_index(net, dst->remote_ifindex);
2600
2601                 if (!lowerdev) {
2602                         pr_info("ifindex %d does not exist\n", dst->remote_ifindex);
2603                         return -ENODEV;
2604                 }
2605
2606 #if IS_ENABLED(CONFIG_IPV6)
2607                 if (use_ipv6) {
2608                         struct inet6_dev *idev = __in6_dev_get(lowerdev);
2609                         if (idev && idev->cnf.disable_ipv6) {
2610                                 pr_info("IPv6 is disabled via sysctl\n");
2611                                 return -EPERM;
2612                         }
2613                         vxlan->flags |= VXLAN_F_IPV6;
2614                 }
2615 #endif
2616
2617                 if (!tb[IFLA_MTU])
2618                         dev->mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2619
2620                 dev->needed_headroom = lowerdev->hard_header_len +
2621                                        (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2622         } else if (use_ipv6)
2623                 vxlan->flags |= VXLAN_F_IPV6;
2624
2625         if (data[IFLA_VXLAN_TOS])
2626                 vxlan->tos  = nla_get_u8(data[IFLA_VXLAN_TOS]);
2627
2628         if (data[IFLA_VXLAN_TTL])
2629                 vxlan->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
2630
2631         if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING]))
2632                 vxlan->flags |= VXLAN_F_LEARN;
2633
2634         if (data[IFLA_VXLAN_AGEING])
2635                 vxlan->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
2636         else
2637                 vxlan->age_interval = FDB_AGE_DEFAULT;
2638
2639         if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY]))
2640                 vxlan->flags |= VXLAN_F_PROXY;
2641
2642         if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC]))
2643                 vxlan->flags |= VXLAN_F_RSC;
2644
2645         if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS]))
2646                 vxlan->flags |= VXLAN_F_L2MISS;
2647
2648         if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS]))
2649                 vxlan->flags |= VXLAN_F_L3MISS;
2650
2651         if (data[IFLA_VXLAN_LIMIT])
2652                 vxlan->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
2653
2654         if (data[IFLA_VXLAN_PORT_RANGE]) {
2655                 const struct ifla_vxlan_port_range *p
2656                         = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2657                 vxlan->port_min = ntohs(p->low);
2658                 vxlan->port_max = ntohs(p->high);
2659         }
2660
2661         if (data[IFLA_VXLAN_PORT])
2662                 vxlan->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
2663
2664         if (data[IFLA_VXLAN_UDP_CSUM] && nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
2665                 vxlan->flags |= VXLAN_F_UDP_CSUM;
2666
2667         if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX] &&
2668             nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
2669                 vxlan->flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
2670
2671         if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX] &&
2672             nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
2673                 vxlan->flags |= VXLAN_F_UDP_ZERO_CSUM6_RX;
2674
2675         if (vxlan_find_vni(net, vni, vxlan->dst_port)) {
2676                 pr_info("duplicate VNI %u\n", vni);
2677                 return -EEXIST;
2678         }
2679
2680         dev->ethtool_ops = &vxlan_ethtool_ops;
2681
2682         /* create an fdb entry for a valid default destination */
2683         if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
2684                 err = vxlan_fdb_create(vxlan, all_zeros_mac,
2685                                        &vxlan->default_dst.remote_ip,
2686                                        NUD_REACHABLE|NUD_PERMANENT,
2687                                        NLM_F_EXCL|NLM_F_CREATE,
2688                                        vxlan->dst_port,
2689                                        vxlan->default_dst.remote_vni,
2690                                        vxlan->default_dst.remote_ifindex,
2691                                        NTF_SELF);
2692                 if (err)
2693                         return err;
2694         }
2695
2696         err = register_netdevice(dev);
2697         if (err) {
2698                 vxlan_fdb_delete_default(vxlan);
2699                 return err;
2700         }
2701
2702         list_add(&vxlan->next, &vn->vxlan_list);
2703
2704         return 0;
2705 }
2706
2707 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
2708 {
2709         struct vxlan_dev *vxlan = netdev_priv(dev);
2710         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2711
2712         spin_lock(&vn->sock_lock);
2713         if (!hlist_unhashed(&vxlan->hlist))
2714                 hlist_del_rcu(&vxlan->hlist);
2715         spin_unlock(&vn->sock_lock);
2716
2717         list_del(&vxlan->next);
2718         unregister_netdevice_queue(dev, head);
2719 }
2720
2721 static size_t vxlan_get_size(const struct net_device *dev)
2722 {
2723
2724         return nla_total_size(sizeof(__u32)) +  /* IFLA_VXLAN_ID */
2725                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
2726                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
2727                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
2728                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TTL */
2729                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TOS */
2730                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_LEARNING */
2731                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_PROXY */
2732                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_RSC */
2733                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_L2MISS */
2734                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_L3MISS */
2735                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
2736                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
2737                 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
2738                 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
2739                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
2740                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
2741                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
2742                 0;
2743 }
2744
2745 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
2746 {
2747         const struct vxlan_dev *vxlan = netdev_priv(dev);
2748         const struct vxlan_rdst *dst = &vxlan->default_dst;
2749         struct ifla_vxlan_port_range ports = {
2750                 .low =  htons(vxlan->port_min),
2751                 .high = htons(vxlan->port_max),
2752         };
2753
2754         if (nla_put_u32(skb, IFLA_VXLAN_ID, dst->remote_vni))
2755                 goto nla_put_failure;
2756
2757         if (!vxlan_addr_any(&dst->remote_ip)) {
2758                 if (dst->remote_ip.sa.sa_family == AF_INET) {
2759                         if (nla_put_be32(skb, IFLA_VXLAN_GROUP,
2760                                          dst->remote_ip.sin.sin_addr.s_addr))
2761                                 goto nla_put_failure;
2762 #if IS_ENABLED(CONFIG_IPV6)
2763                 } else {
2764                         if (nla_put(skb, IFLA_VXLAN_GROUP6, sizeof(struct in6_addr),
2765                                     &dst->remote_ip.sin6.sin6_addr))
2766                                 goto nla_put_failure;
2767 #endif
2768                 }
2769         }
2770
2771         if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
2772                 goto nla_put_failure;
2773
2774         if (!vxlan_addr_any(&vxlan->saddr)) {
2775                 if (vxlan->saddr.sa.sa_family == AF_INET) {
2776                         if (nla_put_be32(skb, IFLA_VXLAN_LOCAL,
2777                                          vxlan->saddr.sin.sin_addr.s_addr))
2778                                 goto nla_put_failure;
2779 #if IS_ENABLED(CONFIG_IPV6)
2780                 } else {
2781                         if (nla_put(skb, IFLA_VXLAN_LOCAL6, sizeof(struct in6_addr),
2782                                     &vxlan->saddr.sin6.sin6_addr))
2783                                 goto nla_put_failure;
2784 #endif
2785                 }
2786         }
2787
2788         if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->ttl) ||
2789             nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->tos) ||
2790             nla_put_u8(skb, IFLA_VXLAN_LEARNING,
2791                         !!(vxlan->flags & VXLAN_F_LEARN)) ||
2792             nla_put_u8(skb, IFLA_VXLAN_PROXY,
2793                         !!(vxlan->flags & VXLAN_F_PROXY)) ||
2794             nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) ||
2795             nla_put_u8(skb, IFLA_VXLAN_L2MISS,
2796                         !!(vxlan->flags & VXLAN_F_L2MISS)) ||
2797             nla_put_u8(skb, IFLA_VXLAN_L3MISS,
2798                         !!(vxlan->flags & VXLAN_F_L3MISS)) ||
2799             nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->age_interval) ||
2800             nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->addrmax) ||
2801             nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->dst_port) ||
2802             nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
2803                         !!(vxlan->flags & VXLAN_F_UDP_CSUM)) ||
2804             nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
2805                         !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
2806             nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
2807                         !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_RX)))
2808                 goto nla_put_failure;
2809
2810         if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
2811                 goto nla_put_failure;
2812
2813         return 0;
2814
2815 nla_put_failure:
2816         return -EMSGSIZE;
2817 }
2818
2819 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
2820         .kind           = "vxlan",
2821         .maxtype        = IFLA_VXLAN_MAX,
2822         .policy         = vxlan_policy,
2823         .priv_size      = sizeof(struct vxlan_dev),
2824         .setup          = vxlan_setup,
2825         .validate       = vxlan_validate,
2826         .newlink        = vxlan_newlink,
2827         .dellink        = vxlan_dellink,
2828         .get_size       = vxlan_get_size,
2829         .fill_info      = vxlan_fill_info,
2830 };
2831
2832 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
2833                                              struct net_device *dev)
2834 {
2835         struct vxlan_dev *vxlan, *next;
2836         LIST_HEAD(list_kill);
2837
2838         list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
2839                 struct vxlan_rdst *dst = &vxlan->default_dst;
2840
2841                 /* In case we created vxlan device with carrier
2842                  * and we loose the carrier due to module unload
2843                  * we also need to remove vxlan device. In other
2844                  * cases, it's not necessary and remote_ifindex
2845                  * is 0 here, so no matches.
2846                  */
2847                 if (dst->remote_ifindex == dev->ifindex)
2848                         vxlan_dellink(vxlan->dev, &list_kill);
2849         }
2850
2851         unregister_netdevice_many(&list_kill);
2852 }
2853
2854 static int vxlan_lowerdev_event(struct notifier_block *unused,
2855                                 unsigned long event, void *ptr)
2856 {
2857         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2858         struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
2859
2860         if (event == NETDEV_UNREGISTER)
2861                 vxlan_handle_lowerdev_unregister(vn, dev);
2862
2863         return NOTIFY_DONE;
2864 }
2865
2866 static struct notifier_block vxlan_notifier_block __read_mostly = {
2867         .notifier_call = vxlan_lowerdev_event,
2868 };
2869
2870 static __net_init int vxlan_init_net(struct net *net)
2871 {
2872         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2873         unsigned int h;
2874
2875         INIT_LIST_HEAD(&vn->vxlan_list);
2876         spin_lock_init(&vn->sock_lock);
2877
2878         for (h = 0; h < PORT_HASH_SIZE; ++h)
2879                 INIT_HLIST_HEAD(&vn->sock_list[h]);
2880
2881         return 0;
2882 }
2883
2884 static void __net_exit vxlan_exit_net(struct net *net)
2885 {
2886         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2887         struct vxlan_dev *vxlan, *next;
2888         struct net_device *dev, *aux;
2889         LIST_HEAD(list);
2890
2891         rtnl_lock();
2892         for_each_netdev_safe(net, dev, aux)
2893                 if (dev->rtnl_link_ops == &vxlan_link_ops)
2894                         unregister_netdevice_queue(dev, &list);
2895
2896         list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
2897                 /* If vxlan->dev is in the same netns, it has already been added
2898                  * to the list by the previous loop.
2899                  */
2900                 if (!net_eq(dev_net(vxlan->dev), net))
2901                         unregister_netdevice_queue(dev, &list);
2902         }
2903
2904         unregister_netdevice_many(&list);
2905         rtnl_unlock();
2906 }
2907
2908 static struct pernet_operations vxlan_net_ops = {
2909         .init = vxlan_init_net,
2910         .exit = vxlan_exit_net,
2911         .id   = &vxlan_net_id,
2912         .size = sizeof(struct vxlan_net),
2913 };
2914
2915 static int __init vxlan_init_module(void)
2916 {
2917         int rc;
2918
2919         vxlan_wq = alloc_workqueue("vxlan", 0, 0);
2920         if (!vxlan_wq)
2921                 return -ENOMEM;
2922
2923         get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
2924
2925         rc = register_pernet_subsys(&vxlan_net_ops);
2926         if (rc)
2927                 goto out1;
2928
2929         rc = register_netdevice_notifier(&vxlan_notifier_block);
2930         if (rc)
2931                 goto out2;
2932
2933         rc = rtnl_link_register(&vxlan_link_ops);
2934         if (rc)
2935                 goto out3;
2936
2937         return 0;
2938 out3:
2939         unregister_netdevice_notifier(&vxlan_notifier_block);
2940 out2:
2941         unregister_pernet_subsys(&vxlan_net_ops);
2942 out1:
2943         destroy_workqueue(vxlan_wq);
2944         return rc;
2945 }
2946 late_initcall(vxlan_init_module);
2947
2948 static void __exit vxlan_cleanup_module(void)
2949 {
2950         rtnl_link_unregister(&vxlan_link_ops);
2951         unregister_netdevice_notifier(&vxlan_notifier_block);
2952         destroy_workqueue(vxlan_wq);
2953         unregister_pernet_subsys(&vxlan_net_ops);
2954         /* rcu_barrier() is called by netns */
2955 }
2956 module_exit(vxlan_cleanup_module);
2957
2958 MODULE_LICENSE("GPL");
2959 MODULE_VERSION(VXLAN_VERSION);
2960 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
2961 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
2962 MODULE_ALIAS_RTNL_LINK("vxlan");