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/udp_tunnel.h>
  37 #include <net/rtnetlink.h>
  38 #include <net/route.h>
  39 #include <net/dsfield.h>
  40 #include <net/inet_ecn.h>
  41 #include <net/net_namespace.h>
  42 #include <net/netns/generic.h>
  43 #include <net/vxlan.h>
  44 #include <net/protocol.h>
  45 #include <net/udp_tunnel.h>
  46 #if IS_ENABLED(CONFIG_IPV6)
  47 #include <net/ipv6.h>
  48 #include <net/addrconf.h>
  49 #include <net/ip6_tunnel.h>
  50 #include <net/ip6_checksum.h>
  51 #endif
  52
  53 #define VXLAN_VERSION   "0.1"
  54
  55 #define PORT_HASH_BITS  8
  56 #define PORT_HASH_SIZE  (1<<PORT_HASH_BITS)
  57 #define VNI_HASH_BITS   10
  58 #define VNI_HASH_SIZE   (1<<VNI_HASH_BITS)
  59 #define FDB_HASH_BITS   8
  60 #define FDB_HASH_SIZE   (1<<FDB_HASH_BITS)
  61 #define FDB_AGE_DEFAULT 300 /* 5 min */
  62 #define FDB_AGE_INTERVAL (10 * HZ)      /* rescan interval */
  63
  64 /* UDP port for VXLAN traffic.
  65  * The IANA assigned port is 4789, but the Linux default is 8472
  66  * for compatibility with early adopters.
  67  */
  68 static unsigned short vxlan_port __read_mostly = 8472;
  69 module_param_named(udp_port, vxlan_port, ushort, 0444);
  70 MODULE_PARM_DESC(udp_port, "Destination UDP port");
  71
  72 static bool log_ecn_error = true;
  73 module_param(log_ecn_error, bool, 0644);
  74 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
  75
  76 static int vxlan_net_id;
  77
  78 static const u8 all_zeros_mac[ETH_ALEN];
  79
  80 /* per-network namespace private data for this module */
  81 struct vxlan_net {
  82         struct list_head  vxlan_list;
  83         struct hlist_head sock_list[PORT_HASH_SIZE];
  84         spinlock_t        sock_lock;
  85 };
  86
  87 union vxlan_addr {
  88         struct sockaddr_in sin;
  89         struct sockaddr_in6 sin6;
  90         struct sockaddr sa;
  91 };
  92
  93 struct vxlan_rdst {
  94         union vxlan_addr         remote_ip;
  95         __be16                   remote_port;
  96         u32                      remote_vni;
  97         u32                      remote_ifindex;
  98         struct list_head         list;
  99         struct rcu_head          rcu;
 100 };
 101
 102 /* Forwarding table entry */
 103 struct vxlan_fdb {
 104         struct hlist_node hlist;        /* linked list of entries */
 105         struct rcu_head   rcu;
 106         unsigned long     updated;      /* jiffies */
 107         unsigned long     used;
 108         struct list_head  remotes;
 109         u16               state;        /* see ndm_state */
 110         u8                flags;        /* see ndm_flags */
 111         u8                eth_addr[ETH_ALEN];
 112 };
 113
 114 /* Pseudo network device */
 115 struct vxlan_dev {
 116         struct hlist_node hlist;        /* vni hash table */
 117         struct list_head  next;         /* vxlan's per namespace list */
 118         struct vxlan_sock *vn_sock;     /* listening socket */
 119         struct net_device *dev;
 120         struct net        *net;         /* netns for packet i/o */
 121         struct vxlan_rdst default_dst;  /* default destination */
 122         union vxlan_addr  saddr;        /* source address */
 123         __be16            dst_port;
 124         __u16             port_min;     /* source port range */
 125         __u16             port_max;
 126         __u8              tos;          /* TOS override */
 127         __u8              ttl;
 128         u32               flags;        /* VXLAN_F_* in vxlan.h */
 129
 130         struct work_struct sock_work;
 131         struct work_struct igmp_join;
 132         struct work_struct igmp_leave;
 133
 134         unsigned long     age_interval;
 135         struct timer_list age_timer;
 136         spinlock_t        hash_lock;
 137         unsigned int      addrcnt;
 138         unsigned int      addrmax;
 139
 140         struct hlist_head fdb_head[FDB_HASH_SIZE];
 141 };
 142
 143 /* salt for hash table */
 144 static u32 vxlan_salt __read_mostly;
 145 static struct workqueue_struct *vxlan_wq;
 146
 147 static void vxlan_sock_work(struct work_struct *work);
 148
 149 #if IS_ENABLED(CONFIG_IPV6)
 150 static inline
 151 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
 152 {
 153        if (a->sa.sa_family != b->sa.sa_family)
 154                return false;
 155        if (a->sa.sa_family == AF_INET6)
 156                return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
 157        else
 158                return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
 159 }
 160
 161 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
 162 {
 163        if (ipa->sa.sa_family == AF_INET6)
 164                return ipv6_addr_any(&ipa->sin6.sin6_addr);
 165        else
 166                return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
 167 }
 168
 169 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
 170 {
 171        if (ipa->sa.sa_family == AF_INET6)
 172                return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr);
 173        else
 174                return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
 175 }
 176
 177 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
 178 {
 179        if (nla_len(nla) >= sizeof(struct in6_addr)) {
 180                nla_memcpy(&ip->sin6.sin6_addr, nla, sizeof(struct in6_addr));
 181                ip->sa.sa_family = AF_INET6;
 182                return 0;
 183        } else if (nla_len(nla) >= sizeof(__be32)) {
 184                ip->sin.sin_addr.s_addr = nla_get_be32(nla);
 185                ip->sa.sa_family = AF_INET;
 186                return 0;
 187        } else {
 188                return -EAFNOSUPPORT;
 189        }
 190 }
 191
 192 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
 193                              const union vxlan_addr *ip)
 194 {
 195        if (ip->sa.sa_family == AF_INET6)
 196                return nla_put(skb, attr, sizeof(struct in6_addr), &ip->sin6.sin6_addr);
 197        else
 198                return nla_put_be32(skb, attr, ip->sin.sin_addr.s_addr);
 199 }
 200
 201 #else /* !CONFIG_IPV6 */
 202
 203 static inline
 204 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
 205 {
 206        return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
 207 }
 208
 209 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
 210 {
 211        return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
 212 }
 213
 214 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
 215 {
 216        return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
 217 }
 218
 219 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
 220 {
 221        if (nla_len(nla) >= sizeof(struct in6_addr)) {
 222                return -EAFNOSUPPORT;
 223        } else if (nla_len(nla) >= sizeof(__be32)) {
 224                ip->sin.sin_addr.s_addr = nla_get_be32(nla);
 225                ip->sa.sa_family = AF_INET;
 226                return 0;
 227        } else {
 228                return -EAFNOSUPPORT;
 229        }
 230 }
 231
 232 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
 233                              const union vxlan_addr *ip)
 234 {
 235        return nla_put_be32(skb, attr, ip->sin.sin_addr.s_addr);
 236 }
 237 #endif
 238
 239 /* Virtual Network hash table head */
 240 static inline struct hlist_head *vni_head(struct vxlan_sock *vs, u32 id)
 241 {
 242         return &vs->vni_list[hash_32(id, VNI_HASH_BITS)];
 243 }
 244
 245 /* Socket hash table head */
 246 static inline struct hlist_head *vs_head(struct net *net, __be16 port)
 247 {
 248         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
 249
 250         return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
 251 }
 252
 253 /* First remote destination for a forwarding entry.
 254  * Guaranteed to be non-NULL because remotes are never deleted.
 255  */
 256 static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
 257 {
 258         return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
 259 }
 260
 261 static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
 262 {
 263         return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
 264 }
 265
 266 /* Find VXLAN socket based on network namespace, address family and UDP port
 267  * and enabled unshareable flags.
 268  */
 269 static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family,
 270                                           __be16 port, u32 flags)
 271 {
 272         struct vxlan_sock *vs;
 273
 274         flags &= VXLAN_F_RCV_FLAGS;
 275
 276         hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
 277                 if (inet_sk(vs->sock->sk)->inet_sport == port &&
 278                     inet_sk(vs->sock->sk)->sk.sk_family == family &&
 279                     vs->flags == flags)
 280                         return vs;
 281         }
 282         return NULL;
 283 }
 284
 285 static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, u32 id)
 286 {
 287         struct vxlan_dev *vxlan;
 288
 289         hlist_for_each_entry_rcu(vxlan, vni_head(vs, id), hlist) {
 290                 if (vxlan->default_dst.remote_vni == id)
 291                         return vxlan;
 292         }
 293
 294         return NULL;
 295 }
 296
 297 /* Look up VNI in a per net namespace table */
 298 static struct vxlan_dev *vxlan_find_vni(struct net *net, u32 id,
 299                                         sa_family_t family, __be16 port,
 300                                         u32 flags)
 301 {
 302         struct vxlan_sock *vs;
 303
 304         vs = vxlan_find_sock(net, family, port, flags);
 305         if (!vs)
 306                 return NULL;
 307
 308         return vxlan_vs_find_vni(vs, id);
 309 }
 310
 311 /* Fill in neighbour message in skbuff. */
 312 static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
 313                           const struct vxlan_fdb *fdb,
 314                           u32 portid, u32 seq, int type, unsigned int flags,
 315                           const struct vxlan_rdst *rdst)
 316 {
 317         unsigned long now = jiffies;
 318         struct nda_cacheinfo ci;
 319         struct nlmsghdr *nlh;
 320         struct ndmsg *ndm;
 321         bool send_ip, send_eth;
 322
 323         nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
 324         if (nlh == NULL)
 325                 return -EMSGSIZE;
 326
 327         ndm = nlmsg_data(nlh);
 328         memset(ndm, 0, sizeof(*ndm));
 329
 330         send_eth = send_ip = true;
 331
 332         if (type == RTM_GETNEIGH) {
 333                 ndm->ndm_family = AF_INET;
 334                 send_ip = !vxlan_addr_any(&rdst->remote_ip);
 335                 send_eth = !is_zero_ether_addr(fdb->eth_addr);
 336         } else
 337                 ndm->ndm_family = AF_BRIDGE;
 338         ndm->ndm_state = fdb->state;
 339         ndm->ndm_ifindex = vxlan->dev->ifindex;
 340         ndm->ndm_flags = fdb->flags;
 341         ndm->ndm_type = RTN_UNICAST;
 342
 343         if (!net_eq(dev_net(vxlan->dev), vxlan->net) &&
 344             nla_put_s32(skb, NDA_NDM_IFINDEX_NETNSID,
 345                         peernet2id(vxlan->net, dev_net(vxlan->dev))))
 346                 goto nla_put_failure;
 347
 348         if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
 349                 goto nla_put_failure;
 350
 351         if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
 352                 goto nla_put_failure;
 353
 354         if (rdst->remote_port && rdst->remote_port != vxlan->dst_port &&
 355             nla_put_be16(skb, NDA_PORT, rdst->remote_port))
 356                 goto nla_put_failure;
 357         if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
 358             nla_put_u32(skb, NDA_VNI, rdst->remote_vni))
 359                 goto nla_put_failure;
 360         if (rdst->remote_ifindex &&
 361             nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
 362                 goto nla_put_failure;
 363
 364         ci.ndm_used      = jiffies_to_clock_t(now - fdb->used);
 365         ci.ndm_confirmed = 0;
 366         ci.ndm_updated   = jiffies_to_clock_t(now - fdb->updated);
 367         ci.ndm_refcnt    = 0;
 368
 369         if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
 370                 goto nla_put_failure;
 371
 372         nlmsg_end(skb, nlh);
 373         return 0;
 374
 375 nla_put_failure:
 376         nlmsg_cancel(skb, nlh);
 377         return -EMSGSIZE;
 378 }
 379
 380 static inline size_t vxlan_nlmsg_size(void)
 381 {
 382         return NLMSG_ALIGN(sizeof(struct ndmsg))
 383                 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
 384                 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
 385                 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
 386                 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
 387                 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
 388                 + nla_total_size(sizeof(struct nda_cacheinfo));
 389 }
 390
 391 static void vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
 392                              struct vxlan_rdst *rd, int type)
 393 {
 394         struct net *net = dev_net(vxlan->dev);
 395         struct sk_buff *skb;
 396         int err = -ENOBUFS;
 397
 398         skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
 399         if (skb == NULL)
 400                 goto errout;
 401
 402         err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
 403         if (err < 0) {
 404                 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
 405                 WARN_ON(err == -EMSGSIZE);
 406                 kfree_skb(skb);
 407                 goto errout;
 408         }
 409
 410         rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
 411         return;
 412 errout:
 413         if (err < 0)
 414                 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
 415 }
 416
 417 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
 418 {
 419         struct vxlan_dev *vxlan = netdev_priv(dev);
 420         struct vxlan_fdb f = {
 421                 .state = NUD_STALE,
 422         };
 423         struct vxlan_rdst remote = {
 424                 .remote_ip = *ipa, /* goes to NDA_DST */
 425                 .remote_vni = VXLAN_N_VID,
 426         };
 427
 428         vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
 429 }
 430
 431 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
 432 {
 433         struct vxlan_fdb f = {
 434                 .state = NUD_STALE,
 435         };
 436         struct vxlan_rdst remote = { };
 437
 438         memcpy(f.eth_addr, eth_addr, ETH_ALEN);
 439
 440         vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
 441 }
 442
 443 /* Hash Ethernet address */
 444 static u32 eth_hash(const unsigned char *addr)
 445 {
 446         u64 value = get_unaligned((u64 *)addr);
 447
 448         /* only want 6 bytes */
 449 #ifdef __BIG_ENDIAN
 450         value >>= 16;
 451 #else
 452         value <<= 16;
 453 #endif
 454         return hash_64(value, FDB_HASH_BITS);
 455 }
 456
 457 /* Hash chain to use given mac address */
 458 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
 459                                                 const u8 *mac)
 460 {
 461         return &vxlan->fdb_head[eth_hash(mac)];
 462 }
 463
 464 /* Look up Ethernet address in forwarding table */
 465 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
 466                                         const u8 *mac)
 467 {
 468         struct hlist_head *head = vxlan_fdb_head(vxlan, mac);
 469         struct vxlan_fdb *f;
 470
 471         hlist_for_each_entry_rcu(f, head, hlist) {
 472                 if (ether_addr_equal(mac, f->eth_addr))
 473                         return f;
 474         }
 475
 476         return NULL;
 477 }
 478
 479 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
 480                                         const u8 *mac)
 481 {
 482         struct vxlan_fdb *f;
 483
 484         f = __vxlan_find_mac(vxlan, mac);
 485         if (f)
 486                 f->used = jiffies;
 487
 488         return f;
 489 }
 490
 491 /* caller should hold vxlan->hash_lock */
 492 static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
 493                                               union vxlan_addr *ip, __be16 port,
 494                                               __u32 vni, __u32 ifindex)
 495 {
 496         struct vxlan_rdst *rd;
 497
 498         list_for_each_entry(rd, &f->remotes, list) {
 499                 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
 500                     rd->remote_port == port &&
 501                     rd->remote_vni == vni &&
 502                     rd->remote_ifindex == ifindex)
 503                         return rd;
 504         }
 505
 506         return NULL;
 507 }
 508
 509 /* Replace destination of unicast mac */
 510 static int vxlan_fdb_replace(struct vxlan_fdb *f,
 511                              union vxlan_addr *ip, __be16 port, __u32 vni, __u32 ifindex)
 512 {
 513         struct vxlan_rdst *rd;
 514
 515         rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
 516         if (rd)
 517                 return 0;
 518
 519         rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
 520         if (!rd)
 521                 return 0;
 522         rd->remote_ip = *ip;
 523         rd->remote_port = port;
 524         rd->remote_vni = vni;
 525         rd->remote_ifindex = ifindex;
 526         return 1;
 527 }
 528
 529 /* Add/update destinations for multicast */
 530 static int vxlan_fdb_append(struct vxlan_fdb *f,
 531                             union vxlan_addr *ip, __be16 port, __u32 vni,
 532                             __u32 ifindex, struct vxlan_rdst **rdp)
 533 {
 534         struct vxlan_rdst *rd;
 535
 536         rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
 537         if (rd)
 538                 return 0;
 539
 540         rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
 541         if (rd == NULL)
 542                 return -ENOBUFS;
 543         rd->remote_ip = *ip;
 544         rd->remote_port = port;
 545         rd->remote_vni = vni;
 546         rd->remote_ifindex = ifindex;
 547
 548         list_add_tail_rcu(&rd->list, &f->remotes);
 549
 550         *rdp = rd;
 551         return 1;
 552 }
 553
 554 static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
 555                                           unsigned int off,
 556                                           struct vxlanhdr *vh, size_t hdrlen,
 557                                           u32 data)
 558 {
 559         size_t start, offset, plen;
 560         __wsum delta;
 561
 562         if (skb->remcsum_offload)
 563                 return vh;
 564
 565         if (!NAPI_GRO_CB(skb)->csum_valid)
 566                 return NULL;
 567
 568         start = (data & VXLAN_RCO_MASK) << VXLAN_RCO_SHIFT;
 569         offset = start + ((data & VXLAN_RCO_UDP) ?
 570                           offsetof(struct udphdr, check) :
 571                           offsetof(struct tcphdr, check));
 572
 573         plen = hdrlen + offset + sizeof(u16);
 574
 575         /* Pull checksum that will be written */
 576         if (skb_gro_header_hard(skb, off + plen)) {
 577                 vh = skb_gro_header_slow(skb, off + plen, off);
 578                 if (!vh)
 579                         return NULL;
 580         }
 581
 582         delta = remcsum_adjust((void *)vh + hdrlen,
 583                                NAPI_GRO_CB(skb)->csum, start, offset);
 584
 585         /* Adjust skb->csum since we changed the packet */
 586         skb->csum = csum_add(skb->csum, delta);
 587         NAPI_GRO_CB(skb)->csum = csum_add(NAPI_GRO_CB(skb)->csum, delta);
 588
 589         skb->remcsum_offload = 1;
 590
 591         return vh;
 592 }
 593
 594 static struct sk_buff **vxlan_gro_receive(struct sk_buff **head,
 595                                           struct sk_buff *skb,
 596                                           struct udp_offload *uoff)
 597 {
 598         struct sk_buff *p, **pp = NULL;
 599         struct vxlanhdr *vh, *vh2;
 600         unsigned int hlen, off_vx;
 601         int flush = 1;
 602         struct vxlan_sock *vs = container_of(uoff, struct vxlan_sock,
 603                                              udp_offloads);
 604         u32 flags;
 605
 606         off_vx = skb_gro_offset(skb);
 607         hlen = off_vx + sizeof(*vh);
 608         vh   = skb_gro_header_fast(skb, off_vx);
 609         if (skb_gro_header_hard(skb, hlen)) {
 610                 vh = skb_gro_header_slow(skb, hlen, off_vx);
 611                 if (unlikely(!vh))
 612                         goto out;
 613         }
 614
 615         skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
 616         skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
 617
 618         flags = ntohl(vh->vx_flags);
 619
 620         if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
 621                 vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
 622                                        ntohl(vh->vx_vni));
 623
 624                 if (!vh)
 625                         goto out;
 626         }
 627
 628         flush = 0;
 629
 630         for (p = *head; p; p = p->next) {
 631                 if (!NAPI_GRO_CB(p)->same_flow)
 632                         continue;
 633
 634                 vh2 = (struct vxlanhdr *)(p->data + off_vx);
 635                 if (vh->vx_flags != vh2->vx_flags ||
 636                     vh->vx_vni != vh2->vx_vni) {
 637                         NAPI_GRO_CB(p)->same_flow = 0;
 638                         continue;
 639                 }
 640         }
 641
 642         pp = eth_gro_receive(head, skb);
 643
 644 out:
 645         NAPI_GRO_CB(skb)->flush |= flush;
 646
 647         return pp;
 648 }
 649
 650 static int vxlan_gro_complete(struct sk_buff *skb, int nhoff,
 651                               struct udp_offload *uoff)
 652 {
 653         udp_tunnel_gro_complete(skb, nhoff);
 654
 655         return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
 656 }
 657
 658 /* Notify netdevs that UDP port started listening */
 659 static void vxlan_notify_add_rx_port(struct vxlan_sock *vs)
 660 {
 661         struct net_device *dev;
 662         struct sock *sk = vs->sock->sk;
 663         struct net *net = sock_net(sk);
 664         sa_family_t sa_family = sk->sk_family;
 665         __be16 port = inet_sk(sk)->inet_sport;
 666         int err;
 667
 668         if (sa_family == AF_INET) {
 669                 err = udp_add_offload(&vs->udp_offloads);
 670                 if (err)
 671                         pr_warn("vxlan: udp_add_offload failed with status %d\n", err);
 672         }
 673
 674         rcu_read_lock();
 675         for_each_netdev_rcu(net, dev) {
 676                 if (dev->netdev_ops->ndo_add_vxlan_port)
 677                         dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
 678                                                             port);
 679         }
 680         rcu_read_unlock();
 681 }
 682
 683 /* Notify netdevs that UDP port is no more listening */
 684 static void vxlan_notify_del_rx_port(struct vxlan_sock *vs)
 685 {
 686         struct net_device *dev;
 687         struct sock *sk = vs->sock->sk;
 688         struct net *net = sock_net(sk);
 689         sa_family_t sa_family = sk->sk_family;
 690         __be16 port = inet_sk(sk)->inet_sport;
 691
 692         rcu_read_lock();
 693         for_each_netdev_rcu(net, dev) {
 694                 if (dev->netdev_ops->ndo_del_vxlan_port)
 695                         dev->netdev_ops->ndo_del_vxlan_port(dev, sa_family,
 696                                                             port);
 697         }
 698         rcu_read_unlock();
 699
 700         if (sa_family == AF_INET)
 701                 udp_del_offload(&vs->udp_offloads);
 702 }
 703
 704 /* Add new entry to forwarding table -- assumes lock held */
 705 static int vxlan_fdb_create(struct vxlan_dev *vxlan,
 706                             const u8 *mac, union vxlan_addr *ip,
 707                             __u16 state, __u16 flags,
 708                             __be16 port, __u32 vni, __u32 ifindex,
 709                             __u8 ndm_flags)
 710 {
 711         struct vxlan_rdst *rd = NULL;
 712         struct vxlan_fdb *f;
 713         int notify = 0;
 714
 715         f = __vxlan_find_mac(vxlan, mac);
 716         if (f) {
 717                 if (flags & NLM_F_EXCL) {
 718                         netdev_dbg(vxlan->dev,
 719                                    "lost race to create %pM\n", mac);
 720                         return -EEXIST;
 721                 }
 722                 if (f->state != state) {
 723                         f->state = state;
 724                         f->updated = jiffies;
 725                         notify = 1;
 726                 }
 727                 if (f->flags != ndm_flags) {
 728                         f->flags = ndm_flags;
 729                         f->updated = jiffies;
 730                         notify = 1;
 731                 }
 732                 if ((flags & NLM_F_REPLACE)) {
 733                         /* Only change unicasts */
 734                         if (!(is_multicast_ether_addr(f->eth_addr) ||
 735                              is_zero_ether_addr(f->eth_addr))) {
 736                                 int rc = vxlan_fdb_replace(f, ip, port, vni,
 737                                                            ifindex);
 738
 739                                 if (rc < 0)
 740                                         return rc;
 741                                 notify |= rc;
 742                         } else
 743                                 return -EOPNOTSUPP;
 744                 }
 745                 if ((flags & NLM_F_APPEND) &&
 746                     (is_multicast_ether_addr(f->eth_addr) ||
 747                      is_zero_ether_addr(f->eth_addr))) {
 748                         int rc = vxlan_fdb_append(f, ip, port, vni, ifindex,
 749                                                   &rd);
 750
 751                         if (rc < 0)
 752                                 return rc;
 753                         notify |= rc;
 754                 }
 755         } else {
 756                 if (!(flags & NLM_F_CREATE))
 757                         return -ENOENT;
 758
 759                 if (vxlan->addrmax && vxlan->addrcnt >= vxlan->addrmax)
 760                         return -ENOSPC;
 761
 762                 /* Disallow replace to add a multicast entry */
 763                 if ((flags & NLM_F_REPLACE) &&
 764                     (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
 765                         return -EOPNOTSUPP;
 766
 767                 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
 768                 f = kmalloc(sizeof(*f), GFP_ATOMIC);
 769                 if (!f)
 770                         return -ENOMEM;
 771
 772                 notify = 1;
 773                 f->state = state;
 774                 f->flags = ndm_flags;
 775                 f->updated = f->used = jiffies;
 776                 INIT_LIST_HEAD(&f->remotes);
 777                 memcpy(f->eth_addr, mac, ETH_ALEN);
 778
 779                 vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
 780
 781                 ++vxlan->addrcnt;
 782                 hlist_add_head_rcu(&f->hlist,
 783                                    vxlan_fdb_head(vxlan, mac));
 784         }
 785
 786         if (notify) {
 787                 if (rd == NULL)
 788                         rd = first_remote_rtnl(f);
 789                 vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH);
 790         }
 791
 792         return 0;
 793 }
 794
 795 static void vxlan_fdb_free(struct rcu_head *head)
 796 {
 797         struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
 798         struct vxlan_rdst *rd, *nd;
 799
 800         list_for_each_entry_safe(rd, nd, &f->remotes, list)
 801                 kfree(rd);
 802         kfree(f);
 803 }
 804
 805 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f)
 806 {
 807         netdev_dbg(vxlan->dev,
 808                     "delete %pM\n", f->eth_addr);
 809
 810         --vxlan->addrcnt;
 811         vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_DELNEIGH);
 812
 813         hlist_del_rcu(&f->hlist);
 814         call_rcu(&f->rcu, vxlan_fdb_free);
 815 }
 816
 817 static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
 818                            union vxlan_addr *ip, __be16 *port, u32 *vni, u32 *ifindex)
 819 {
 820         struct net *net = dev_net(vxlan->dev);
 821         int err;
 822
 823         if (tb[NDA_DST]) {
 824                 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
 825                 if (err)
 826                         return err;
 827         } else {
 828                 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
 829                 if (remote->sa.sa_family == AF_INET) {
 830                         ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
 831                         ip->sa.sa_family = AF_INET;
 832 #if IS_ENABLED(CONFIG_IPV6)
 833                 } else {
 834                         ip->sin6.sin6_addr = in6addr_any;
 835                         ip->sa.sa_family = AF_INET6;
 836 #endif
 837                 }
 838         }
 839
 840         if (tb[NDA_PORT]) {
 841                 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
 842                         return -EINVAL;
 843                 *port = nla_get_be16(tb[NDA_PORT]);
 844         } else {
 845                 *port = vxlan->dst_port;
 846         }
 847
 848         if (tb[NDA_VNI]) {
 849                 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
 850                         return -EINVAL;
 851                 *vni = nla_get_u32(tb[NDA_VNI]);
 852         } else {
 853                 *vni = vxlan->default_dst.remote_vni;
 854         }
 855
 856         if (tb[NDA_IFINDEX]) {
 857                 struct net_device *tdev;
 858
 859                 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
 860                         return -EINVAL;
 861                 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
 862                 tdev = __dev_get_by_index(net, *ifindex);
 863                 if (!tdev)
 864                         return -EADDRNOTAVAIL;
 865         } else {
 866                 *ifindex = 0;
 867         }
 868
 869         return 0;
 870 }
 871
 872 /* Add static entry (via netlink) */
 873 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
 874                          struct net_device *dev,
 875                          const unsigned char *addr, u16 vid, u16 flags)
 876 {
 877         struct vxlan_dev *vxlan = netdev_priv(dev);
 878         /* struct net *net = dev_net(vxlan->dev); */
 879         union vxlan_addr ip;
 880         __be16 port;
 881         u32 vni, ifindex;
 882         int err;
 883
 884         if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
 885                 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
 886                         ndm->ndm_state);
 887                 return -EINVAL;
 888         }
 889
 890         if (tb[NDA_DST] == NULL)
 891                 return -EINVAL;
 892
 893         err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
 894         if (err)
 895                 return err;
 896
 897         if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
 898                 return -EAFNOSUPPORT;
 899
 900         spin_lock_bh(&vxlan->hash_lock);
 901         err = vxlan_fdb_create(vxlan, addr, &ip, ndm->ndm_state, flags,
 902                                port, vni, ifindex, ndm->ndm_flags);
 903         spin_unlock_bh(&vxlan->hash_lock);
 904
 905         return err;
 906 }
 907
 908 /* Delete entry (via netlink) */
 909 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
 910                             struct net_device *dev,
 911                             const unsigned char *addr, u16 vid)
 912 {
 913         struct vxlan_dev *vxlan = netdev_priv(dev);
 914         struct vxlan_fdb *f;
 915         struct vxlan_rdst *rd = NULL;
 916         union vxlan_addr ip;
 917         __be16 port;
 918         u32 vni, ifindex;
 919         int err;
 920
 921         err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
 922         if (err)
 923                 return err;
 924
 925         err = -ENOENT;
 926
 927         spin_lock_bh(&vxlan->hash_lock);
 928         f = vxlan_find_mac(vxlan, addr);
 929         if (!f)
 930                 goto out;
 931
 932         if (!vxlan_addr_any(&ip)) {
 933                 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
 934                 if (!rd)
 935                         goto out;
 936         }
 937
 938         err = 0;
 939
 940         /* remove a destination if it's not the only one on the list,
 941          * otherwise destroy the fdb entry
 942          */
 943         if (rd && !list_is_singular(&f->remotes)) {
 944                 list_del_rcu(&rd->list);
 945                 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH);
 946                 kfree_rcu(rd, rcu);
 947                 goto out;
 948         }
 949
 950         vxlan_fdb_destroy(vxlan, f);
 951
 952 out:
 953         spin_unlock_bh(&vxlan->hash_lock);
 954
 955         return err;
 956 }
 957
 958 /* Dump forwarding table */
 959 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
 960                           struct net_device *dev,
 961                           struct net_device *filter_dev, int idx)
 962 {
 963         struct vxlan_dev *vxlan = netdev_priv(dev);
 964         unsigned int h;
 965
 966         for (h = 0; h < FDB_HASH_SIZE; ++h) {
 967                 struct vxlan_fdb *f;
 968                 int err;
 969
 970                 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
 971                         struct vxlan_rdst *rd;
 972
 973                         if (idx < cb->args[0])
 974                                 goto skip;
 975
 976                         list_for_each_entry_rcu(rd, &f->remotes, list) {
 977                                 err = vxlan_fdb_info(skb, vxlan, f,
 978                                                      NETLINK_CB(cb->skb).portid,
 979                                                      cb->nlh->nlmsg_seq,
 980                                                      RTM_NEWNEIGH,
 981                                                      NLM_F_MULTI, rd);
 982                                 if (err < 0)
 983                                         goto out;
 984                         }
 985 skip:
 986                         ++idx;
 987                 }
 988         }
 989 out:
 990         return idx;
 991 }
 992
 993 /* Watch incoming packets to learn mapping between Ethernet address
 994  * and Tunnel endpoint.
 995  * Return true if packet is bogus and should be droppped.
 996  */
 997 static bool vxlan_snoop(struct net_device *dev,
 998                         union vxlan_addr *src_ip, const u8 *src_mac)
 999 {
1000         struct vxlan_dev *vxlan = netdev_priv(dev);
1001         struct vxlan_fdb *f;
1002
1003         f = vxlan_find_mac(vxlan, src_mac);
1004         if (likely(f)) {
1005                 struct vxlan_rdst *rdst = first_remote_rcu(f);
1006
1007                 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip)))
1008                         return false;
1009
1010                 /* Don't migrate static entries, drop packets */
1011                 if (f->state & NUD_NOARP)
1012                         return true;
1013
1014                 if (net_ratelimit())
1015                         netdev_info(dev,
1016                                     "%pM migrated from %pIS to %pIS\n",
1017                                     src_mac, &rdst->remote_ip, &src_ip);
1018
1019                 rdst->remote_ip = *src_ip;
1020                 f->updated = jiffies;
1021                 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH);
1022         } else {
1023                 /* learned new entry */
1024                 spin_lock(&vxlan->hash_lock);
1025
1026                 /* close off race between vxlan_flush and incoming packets */
1027                 if (netif_running(dev))
1028                         vxlan_fdb_create(vxlan, src_mac, src_ip,
1029                                          NUD_REACHABLE,
1030                                          NLM_F_EXCL|NLM_F_CREATE,
1031                                          vxlan->dst_port,
1032                                          vxlan->default_dst.remote_vni,
1033                                          0, NTF_SELF);
1034                 spin_unlock(&vxlan->hash_lock);
1035         }
1036
1037         return false;
1038 }
1039
1040 /* See if multicast group is already in use by other ID */
1041 static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
1042 {
1043         struct vxlan_dev *vxlan;
1044
1045         /* The vxlan_sock is only used by dev, leaving group has
1046          * no effect on other vxlan devices.
1047          */
1048         if (atomic_read(&dev->vn_sock->refcnt) == 1)
1049                 return false;
1050
1051         list_for_each_entry(vxlan, &vn->vxlan_list, next) {
1052                 if (!netif_running(vxlan->dev) || vxlan == dev)
1053                         continue;
1054
1055                 if (vxlan->vn_sock != dev->vn_sock)
1056                         continue;
1057
1058                 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
1059                                       &dev->default_dst.remote_ip))
1060                         continue;
1061
1062                 if (vxlan->default_dst.remote_ifindex !=
1063                     dev->default_dst.remote_ifindex)
1064                         continue;
1065
1066                 return true;
1067         }
1068
1069         return false;
1070 }
1071
1072 static void vxlan_sock_hold(struct vxlan_sock *vs)
1073 {
1074         atomic_inc(&vs->refcnt);
1075 }
1076
1077 void vxlan_sock_release(struct vxlan_sock *vs)
1078 {
1079         struct sock *sk = vs->sock->sk;
1080         struct net *net = sock_net(sk);
1081         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
1082
1083         if (!atomic_dec_and_test(&vs->refcnt))
1084                 return;
1085
1086         spin_lock(&vn->sock_lock);
1087         hlist_del_rcu(&vs->hlist);
1088         vxlan_notify_del_rx_port(vs);
1089         spin_unlock(&vn->sock_lock);
1090
1091         queue_work(vxlan_wq, &vs->del_work);
1092 }
1093 EXPORT_SYMBOL_GPL(vxlan_sock_release);
1094
1095 /* Callback to update multicast group membership when first VNI on
1096  * multicast asddress is brought up
1097  * Done as workqueue because ip_mc_join_group acquires RTNL.
1098  */
1099 static void vxlan_igmp_join(struct work_struct *work)
1100 {
1101         struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, igmp_join);
1102         struct vxlan_sock *vs = vxlan->vn_sock;
1103         struct sock *sk = vs->sock->sk;
1104         union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1105         int ifindex = vxlan->default_dst.remote_ifindex;
1106
1107         lock_sock(sk);
1108         if (ip->sa.sa_family == AF_INET) {
1109                 struct ip_mreqn mreq = {
1110                         .imr_multiaddr.s_addr   = ip->sin.sin_addr.s_addr,
1111                         .imr_ifindex            = ifindex,
1112                 };
1113
1114                 ip_mc_join_group(sk, &mreq);
1115 #if IS_ENABLED(CONFIG_IPV6)
1116         } else {
1117                 ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1118                                              &ip->sin6.sin6_addr);
1119 #endif
1120         }
1121         release_sock(sk);
1122
1123         vxlan_sock_release(vs);
1124         dev_put(vxlan->dev);
1125 }
1126
1127 /* Inverse of vxlan_igmp_join when last VNI is brought down */
1128 static void vxlan_igmp_leave(struct work_struct *work)
1129 {
1130         struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, igmp_leave);
1131         struct vxlan_sock *vs = vxlan->vn_sock;
1132         struct sock *sk = vs->sock->sk;
1133         union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1134         int ifindex = vxlan->default_dst.remote_ifindex;
1135
1136         lock_sock(sk);
1137         if (ip->sa.sa_family == AF_INET) {
1138                 struct ip_mreqn mreq = {
1139                         .imr_multiaddr.s_addr   = ip->sin.sin_addr.s_addr,
1140                         .imr_ifindex            = ifindex,
1141                 };
1142
1143                 ip_mc_leave_group(sk, &mreq);
1144 #if IS_ENABLED(CONFIG_IPV6)
1145         } else {
1146                 ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1147                                              &ip->sin6.sin6_addr);
1148 #endif
1149         }
1150
1151         release_sock(sk);
1152
1153         vxlan_sock_release(vs);
1154         dev_put(vxlan->dev);
1155 }
1156
1157 static struct vxlanhdr *vxlan_remcsum(struct sk_buff *skb, struct vxlanhdr *vh,
1158                                       size_t hdrlen, u32 data)
1159 {
1160         size_t start, offset, plen;
1161         __wsum delta;
1162
1163         if (skb->remcsum_offload) {
1164                 /* Already processed in GRO path */
1165                 skb->remcsum_offload = 0;
1166                 return vh;
1167         }
1168
1169         start = (data & VXLAN_RCO_MASK) << VXLAN_RCO_SHIFT;
1170         offset = start + ((data & VXLAN_RCO_UDP) ?
1171                           offsetof(struct udphdr, check) :
1172                           offsetof(struct tcphdr, check));
1173
1174         plen = hdrlen + offset + sizeof(u16);
1175
1176         if (!pskb_may_pull(skb, plen))
1177                 return NULL;
1178
1179         vh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1180
1181         if (unlikely(skb->ip_summed != CHECKSUM_COMPLETE))
1182                 __skb_checksum_complete(skb);
1183
1184         delta = remcsum_adjust((void *)vh + hdrlen,
1185                                skb->csum, start, offset);
1186
1187         /* Adjust skb->csum since we changed the packet */
1188         skb->csum = csum_add(skb->csum, delta);
1189
1190         return vh;
1191 }
1192
1193 /* Callback from net/ipv4/udp.c to receive packets */
1194 static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
1195 {
1196         struct vxlan_sock *vs;
1197         struct vxlanhdr *vxh;
1198         u32 flags, vni;
1199         struct vxlan_metadata md = {0};
1200
1201         /* Need Vxlan and inner Ethernet header to be present */
1202         if (!pskb_may_pull(skb, VXLAN_HLEN))
1203                 goto error;
1204
1205         vxh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1206         flags = ntohl(vxh->vx_flags);
1207         vni = ntohl(vxh->vx_vni);
1208
1209         if (flags & VXLAN_HF_VNI) {
1210                 flags &= ~VXLAN_HF_VNI;
1211         } else {
1212                 /* VNI flag always required to be set */
1213                 goto bad_flags;
1214         }
1215
1216         if (iptunnel_pull_header(skb, VXLAN_HLEN, htons(ETH_P_TEB)))
1217                 goto drop;
1218         vxh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1219
1220         vs = rcu_dereference_sk_user_data(sk);
1221         if (!vs)
1222                 goto drop;
1223
1224         if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
1225                 vxh = vxlan_remcsum(skb, vxh, sizeof(struct vxlanhdr), vni);
1226                 if (!vxh)
1227                         goto drop;
1228
1229                 flags &= ~VXLAN_HF_RCO;
1230                 vni &= VXLAN_VID_MASK;
1231         }
1232
1233         /* For backwards compatibility, only allow reserved fields to be
1234          * used by VXLAN extensions if explicitly requested.
1235          */
1236         if ((flags & VXLAN_HF_GBP) && (vs->flags & VXLAN_F_GBP)) {
1237                 struct vxlanhdr_gbp *gbp;
1238
1239                 gbp = (struct vxlanhdr_gbp *)vxh;
1240                 md.gbp = ntohs(gbp->policy_id);
1241
1242                 if (gbp->dont_learn)
1243                         md.gbp |= VXLAN_GBP_DONT_LEARN;
1244
1245                 if (gbp->policy_applied)
1246                         md.gbp |= VXLAN_GBP_POLICY_APPLIED;
1247
1248                 flags &= ~VXLAN_GBP_USED_BITS;
1249         }
1250
1251         if (flags || (vni & ~VXLAN_VID_MASK)) {
1252                 /* If there are any unprocessed flags remaining treat
1253                  * this as a malformed packet. This behavior diverges from
1254                  * VXLAN RFC (RFC7348) which stipulates that bits in reserved
1255                  * in reserved fields are to be ignored. The approach here
1256                  * maintains compatbility with previous stack code, and also
1257                  * is more robust and provides a little more security in
1258                  * adding extensions to VXLAN.
1259                  */
1260
1261                 goto bad_flags;
1262         }
1263
1264         md.vni = vxh->vx_vni;
1265         vs->rcv(vs, skb, &md);
1266         return 0;
1267
1268 drop:
1269         /* Consume bad packet */
1270         kfree_skb(skb);
1271         return 0;
1272
1273 bad_flags:
1274         netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1275                    ntohl(vxh->vx_flags), ntohl(vxh->vx_vni));
1276
1277 error:
1278         /* Return non vxlan pkt */
1279         return 1;
1280 }
1281
1282 static void vxlan_rcv(struct vxlan_sock *vs, struct sk_buff *skb,
1283                       struct vxlan_metadata *md)
1284 {
1285         struct iphdr *oip = NULL;
1286         struct ipv6hdr *oip6 = NULL;
1287         struct vxlan_dev *vxlan;
1288         struct pcpu_sw_netstats *stats;
1289         union vxlan_addr saddr;
1290         __u32 vni;
1291         int err = 0;
1292         union vxlan_addr *remote_ip;
1293
1294         vni = ntohl(md->vni) >> 8;
1295         /* Is this VNI defined? */
1296         vxlan = vxlan_vs_find_vni(vs, vni);
1297         if (!vxlan)
1298                 goto drop;
1299
1300         remote_ip = &vxlan->default_dst.remote_ip;
1301         skb_reset_mac_header(skb);
1302         skb_scrub_packet(skb, !net_eq(vxlan->net, dev_net(vxlan->dev)));
1303         skb->protocol = eth_type_trans(skb, vxlan->dev);
1304         skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1305
1306         /* Ignore packet loops (and multicast echo) */
1307         if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1308                 goto drop;
1309
1310         /* Re-examine inner Ethernet packet */
1311         if (remote_ip->sa.sa_family == AF_INET) {
1312                 oip = ip_hdr(skb);
1313                 saddr.sin.sin_addr.s_addr = oip->saddr;
1314                 saddr.sa.sa_family = AF_INET;
1315 #if IS_ENABLED(CONFIG_IPV6)
1316         } else {
1317                 oip6 = ipv6_hdr(skb);
1318                 saddr.sin6.sin6_addr = oip6->saddr;
1319                 saddr.sa.sa_family = AF_INET6;
1320 #endif
1321         }
1322
1323         if ((vxlan->flags & VXLAN_F_LEARN) &&
1324             vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source))
1325                 goto drop;
1326
1327         skb_reset_network_header(skb);
1328         skb->mark = md->gbp;
1329
1330         if (oip6)
1331                 err = IP6_ECN_decapsulate(oip6, skb);
1332         if (oip)
1333                 err = IP_ECN_decapsulate(oip, skb);
1334
1335         if (unlikely(err)) {
1336                 if (log_ecn_error) {
1337                         if (oip6)
1338                                 net_info_ratelimited("non-ECT from %pI6\n",
1339                                                      &oip6->saddr);
1340                         if (oip)
1341                                 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1342                                                      &oip->saddr, oip->tos);
1343                 }
1344                 if (err > 1) {
1345                         ++vxlan->dev->stats.rx_frame_errors;
1346                         ++vxlan->dev->stats.rx_errors;
1347                         goto drop;
1348                 }
1349         }
1350
1351         stats = this_cpu_ptr(vxlan->dev->tstats);
1352         u64_stats_update_begin(&stats->syncp);
1353         stats->rx_packets++;
1354         stats->rx_bytes += skb->len;
1355         u64_stats_update_end(&stats->syncp);
1356
1357         netif_rx(skb);
1358
1359         return;
1360 drop:
1361         /* Consume bad packet */
1362         kfree_skb(skb);
1363 }
1364
1365 static int arp_reduce(struct net_device *dev, struct sk_buff *skb)
1366 {
1367         struct vxlan_dev *vxlan = netdev_priv(dev);
1368         struct arphdr *parp;
1369         u8 *arpptr, *sha;
1370         __be32 sip, tip;
1371         struct neighbour *n;
1372
1373         if (dev->flags & IFF_NOARP)
1374                 goto out;
1375
1376         if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1377                 dev->stats.tx_dropped++;
1378                 goto out;
1379         }
1380         parp = arp_hdr(skb);
1381
1382         if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1383              parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1384             parp->ar_pro != htons(ETH_P_IP) ||
1385             parp->ar_op != htons(ARPOP_REQUEST) ||
1386             parp->ar_hln != dev->addr_len ||
1387             parp->ar_pln != 4)
1388                 goto out;
1389         arpptr = (u8 *)parp + sizeof(struct arphdr);
1390         sha = arpptr;
1391         arpptr += dev->addr_len;        /* sha */
1392         memcpy(&sip, arpptr, sizeof(sip));
1393         arpptr += sizeof(sip);
1394         arpptr += dev->addr_len;        /* tha */
1395         memcpy(&tip, arpptr, sizeof(tip));
1396
1397         if (ipv4_is_loopback(tip) ||
1398             ipv4_is_multicast(tip))
1399                 goto out;
1400
1401         n = neigh_lookup(&arp_tbl, &tip, dev);
1402
1403         if (n) {
1404                 struct vxlan_fdb *f;
1405                 struct sk_buff  *reply;
1406
1407                 if (!(n->nud_state & NUD_CONNECTED)) {
1408                         neigh_release(n);
1409                         goto out;
1410                 }
1411
1412                 f = vxlan_find_mac(vxlan, n->ha);
1413                 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1414                         /* bridge-local neighbor */
1415                         neigh_release(n);
1416                         goto out;
1417                 }
1418
1419                 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1420                                 n->ha, sha);
1421
1422                 neigh_release(n);
1423
1424                 if (reply == NULL)
1425                         goto out;
1426
1427                 skb_reset_mac_header(reply);
1428                 __skb_pull(reply, skb_network_offset(reply));
1429                 reply->ip_summed = CHECKSUM_UNNECESSARY;
1430                 reply->pkt_type = PACKET_HOST;
1431
1432                 if (netif_rx_ni(reply) == NET_RX_DROP)
1433                         dev->stats.rx_dropped++;
1434         } else if (vxlan->flags & VXLAN_F_L3MISS) {
1435                 union vxlan_addr ipa = {
1436                         .sin.sin_addr.s_addr = tip,
1437                         .sin.sin_family = AF_INET,
1438                 };
1439
1440                 vxlan_ip_miss(dev, &ipa);
1441         }
1442 out:
1443         consume_skb(skb);
1444         return NETDEV_TX_OK;
1445 }
1446
1447 #if IS_ENABLED(CONFIG_IPV6)
1448 static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1449         struct neighbour *n, bool isrouter)
1450 {
1451         struct net_device *dev = request->dev;
1452         struct sk_buff *reply;
1453         struct nd_msg *ns, *na;
1454         struct ipv6hdr *pip6;
1455         u8 *daddr;
1456         int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1457         int ns_olen;
1458         int i, len;
1459
1460         if (dev == NULL)
1461                 return NULL;
1462
1463         len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1464                 sizeof(*na) + na_olen + dev->needed_tailroom;
1465         reply = alloc_skb(len, GFP_ATOMIC);
1466         if (reply == NULL)
1467                 return NULL;
1468
1469         reply->protocol = htons(ETH_P_IPV6);
1470         reply->dev = dev;
1471         skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1472         skb_push(reply, sizeof(struct ethhdr));
1473         skb_set_mac_header(reply, 0);
1474
1475         ns = (struct nd_msg *)skb_transport_header(request);
1476
1477         daddr = eth_hdr(request)->h_source;
1478         ns_olen = request->len - skb_transport_offset(request) - sizeof(*ns);
1479         for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1480                 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1481                         daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1482                         break;
1483                 }
1484         }
1485
1486         /* Ethernet header */
1487         ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1488         ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1489         eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1490         reply->protocol = htons(ETH_P_IPV6);
1491
1492         skb_pull(reply, sizeof(struct ethhdr));
1493         skb_set_network_header(reply, 0);
1494         skb_put(reply, sizeof(struct ipv6hdr));
1495
1496         /* IPv6 header */
1497
1498         pip6 = ipv6_hdr(reply);
1499         memset(pip6, 0, sizeof(struct ipv6hdr));
1500         pip6->version = 6;
1501         pip6->priority = ipv6_hdr(request)->priority;
1502         pip6->nexthdr = IPPROTO_ICMPV6;
1503         pip6->hop_limit = 255;
1504         pip6->daddr = ipv6_hdr(request)->saddr;
1505         pip6->saddr = *(struct in6_addr *)n->primary_key;
1506
1507         skb_pull(reply, sizeof(struct ipv6hdr));
1508         skb_set_transport_header(reply, 0);
1509
1510         na = (struct nd_msg *)skb_put(reply, sizeof(*na) + na_olen);
1511
1512         /* Neighbor Advertisement */
1513         memset(na, 0, sizeof(*na)+na_olen);
1514         na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1515         na->icmph.icmp6_router = isrouter;
1516         na->icmph.icmp6_override = 1;
1517         na->icmph.icmp6_solicited = 1;
1518         na->target = ns->target;
1519         ether_addr_copy(&na->opt[2], n->ha);
1520         na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1521         na->opt[1] = na_olen >> 3;
1522
1523         na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1524                 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1525                 csum_partial(na, sizeof(*na)+na_olen, 0));
1526
1527         pip6->payload_len = htons(sizeof(*na)+na_olen);
1528
1529         skb_push(reply, sizeof(struct ipv6hdr));
1530
1531         reply->ip_summed = CHECKSUM_UNNECESSARY;
1532
1533         return reply;
1534 }
1535
1536 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb)
1537 {
1538         struct vxlan_dev *vxlan = netdev_priv(dev);
1539         struct nd_msg *msg;
1540         const struct ipv6hdr *iphdr;
1541         const struct in6_addr *saddr, *daddr;
1542         struct neighbour *n;
1543         struct inet6_dev *in6_dev;
1544
1545         in6_dev = __in6_dev_get(dev);
1546         if (!in6_dev)
1547                 goto out;
1548
1549         iphdr = ipv6_hdr(skb);
1550         saddr = &iphdr->saddr;
1551         daddr = &iphdr->daddr;
1552
1553         msg = (struct nd_msg *)skb_transport_header(skb);
1554         if (msg->icmph.icmp6_code != 0 ||
1555             msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION)
1556                 goto out;
1557
1558         if (ipv6_addr_loopback(daddr) ||
1559             ipv6_addr_is_multicast(&msg->target))
1560                 goto out;
1561
1562         n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
1563
1564         if (n) {
1565                 struct vxlan_fdb *f;
1566                 struct sk_buff *reply;
1567
1568                 if (!(n->nud_state & NUD_CONNECTED)) {
1569                         neigh_release(n);
1570                         goto out;
1571                 }
1572
1573                 f = vxlan_find_mac(vxlan, n->ha);
1574                 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1575                         /* bridge-local neighbor */
1576                         neigh_release(n);
1577                         goto out;
1578                 }
1579
1580                 reply = vxlan_na_create(skb, n,
1581                                         !!(f ? f->flags & NTF_ROUTER : 0));
1582
1583                 neigh_release(n);
1584
1585                 if (reply == NULL)
1586                         goto out;
1587
1588                 if (netif_rx_ni(reply) == NET_RX_DROP)
1589                         dev->stats.rx_dropped++;
1590
1591         } else if (vxlan->flags & VXLAN_F_L3MISS) {
1592                 union vxlan_addr ipa = {
1593                         .sin6.sin6_addr = msg->target,
1594                         .sin6.sin6_family = AF_INET6,
1595                 };
1596
1597                 vxlan_ip_miss(dev, &ipa);
1598         }
1599
1600 out:
1601         consume_skb(skb);
1602         return NETDEV_TX_OK;
1603 }
1604 #endif
1605
1606 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
1607 {
1608         struct vxlan_dev *vxlan = netdev_priv(dev);
1609         struct neighbour *n;
1610
1611         if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
1612                 return false;
1613
1614         n = NULL;
1615         switch (ntohs(eth_hdr(skb)->h_proto)) {
1616         case ETH_P_IP:
1617         {
1618                 struct iphdr *pip;
1619
1620                 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1621                         return false;
1622                 pip = ip_hdr(skb);
1623                 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
1624                 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1625                         union vxlan_addr ipa = {
1626                                 .sin.sin_addr.s_addr = pip->daddr,
1627                                 .sin.sin_family = AF_INET,
1628                         };
1629
1630                         vxlan_ip_miss(dev, &ipa);
1631                         return false;
1632                 }
1633
1634                 break;
1635         }
1636 #if IS_ENABLED(CONFIG_IPV6)
1637         case ETH_P_IPV6:
1638         {
1639                 struct ipv6hdr *pip6;
1640
1641                 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
1642                         return false;
1643                 pip6 = ipv6_hdr(skb);
1644                 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
1645                 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1646                         union vxlan_addr ipa = {
1647                                 .sin6.sin6_addr = pip6->daddr,
1648                                 .sin6.sin6_family = AF_INET6,
1649                         };
1650
1651                         vxlan_ip_miss(dev, &ipa);
1652                         return false;
1653                 }
1654
1655                 break;
1656         }
1657 #endif
1658         default:
1659                 return false;
1660         }
1661
1662         if (n) {
1663                 bool diff;
1664
1665                 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
1666                 if (diff) {
1667                         memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
1668                                 dev->addr_len);
1669                         memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
1670                 }
1671                 neigh_release(n);
1672                 return diff;
1673         }
1674
1675         return false;
1676 }
1677
1678 static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
1679                                 struct vxlan_metadata *md)
1680 {
1681         struct vxlanhdr_gbp *gbp;
1682
1683         gbp = (struct vxlanhdr_gbp *)vxh;
1684         vxh->vx_flags |= htonl(VXLAN_HF_GBP);
1685
1686         if (md->gbp & VXLAN_GBP_DONT_LEARN)
1687                 gbp->dont_learn = 1;
1688
1689         if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
1690                 gbp->policy_applied = 1;
1691
1692         gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
1693 }
1694
1695 #if IS_ENABLED(CONFIG_IPV6)
1696 static int vxlan6_xmit_skb(struct dst_entry *dst, struct sk_buff *skb,
1697                            struct net_device *dev, struct in6_addr *saddr,
1698                            struct in6_addr *daddr, __u8 prio, __u8 ttl,
1699                            __be16 src_port, __be16 dst_port,
1700                            struct vxlan_metadata *md, bool xnet, u32 vxflags)
1701 {
1702         struct vxlanhdr *vxh;
1703         int min_headroom;
1704         int err;
1705         bool udp_sum = !(vxflags & VXLAN_F_UDP_ZERO_CSUM6_TX);
1706         int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1707         u16 hdrlen = sizeof(struct vxlanhdr);
1708
1709         if ((vxflags & VXLAN_F_REMCSUM_TX) &&
1710             skb->ip_summed == CHECKSUM_PARTIAL) {
1711                 int csum_start = skb_checksum_start_offset(skb);
1712
1713                 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1714                     !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1715                     (skb->csum_offset == offsetof(struct udphdr, check) ||
1716                      skb->csum_offset == offsetof(struct tcphdr, check))) {
1717                         udp_sum = false;
1718                         type |= SKB_GSO_TUNNEL_REMCSUM;
1719                 }
1720         }
1721
1722         skb = iptunnel_handle_offloads(skb, udp_sum, type);
1723         if (IS_ERR(skb)) {
1724                 err = -EINVAL;
1725                 goto err;
1726         }
1727
1728         skb_scrub_packet(skb, xnet);
1729
1730         min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
1731                         + VXLAN_HLEN + sizeof(struct ipv6hdr)
1732                         + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
1733
1734         /* Need space for new headers (invalidates iph ptr) */
1735         err = skb_cow_head(skb, min_headroom);
1736         if (unlikely(err)) {
1737                 kfree_skb(skb);
1738                 goto err;
1739         }
1740
1741         skb = vlan_hwaccel_push_inside(skb);
1742         if (WARN_ON(!skb)) {
1743                 err = -ENOMEM;
1744                 goto err;
1745         }
1746
1747         vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1748         vxh->vx_flags = htonl(VXLAN_HF_VNI);
1749         vxh->vx_vni = md->vni;
1750
1751         if (type & SKB_GSO_TUNNEL_REMCSUM) {
1752                 u32 data = (skb_checksum_start_offset(skb) - hdrlen) >>
1753                            VXLAN_RCO_SHIFT;
1754
1755                 if (skb->csum_offset == offsetof(struct udphdr, check))
1756                         data |= VXLAN_RCO_UDP;
1757
1758                 vxh->vx_vni |= htonl(data);
1759                 vxh->vx_flags |= htonl(VXLAN_HF_RCO);
1760
1761                 if (!skb_is_gso(skb)) {
1762                         skb->ip_summed = CHECKSUM_NONE;
1763                         skb->encapsulation = 0;
1764                 }
1765         }
1766
1767         if (vxflags & VXLAN_F_GBP)
1768                 vxlan_build_gbp_hdr(vxh, vxflags, md);
1769
1770         skb_set_inner_protocol(skb, htons(ETH_P_TEB));
1771
1772         udp_tunnel6_xmit_skb(dst, skb, dev, saddr, daddr, prio,
1773                              ttl, src_port, dst_port,
1774                              !!(vxflags & VXLAN_F_UDP_ZERO_CSUM6_TX));
1775         return 0;
1776 err:
1777         dst_release(dst);
1778         return err;
1779 }
1780 #endif
1781
1782 int vxlan_xmit_skb(struct rtable *rt, struct sk_buff *skb,
1783                    __be32 src, __be32 dst, __u8 tos, __u8 ttl, __be16 df,
1784                    __be16 src_port, __be16 dst_port,
1785                    struct vxlan_metadata *md, bool xnet, u32 vxflags)
1786 {
1787         struct vxlanhdr *vxh;
1788         int min_headroom;
1789         int err;
1790         bool udp_sum = !!(vxflags & VXLAN_F_UDP_CSUM);
1791         int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1792         u16 hdrlen = sizeof(struct vxlanhdr);
1793
1794         if ((vxflags & VXLAN_F_REMCSUM_TX) &&
1795             skb->ip_summed == CHECKSUM_PARTIAL) {
1796                 int csum_start = skb_checksum_start_offset(skb);
1797
1798                 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1799                     !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1800                     (skb->csum_offset == offsetof(struct udphdr, check) ||
1801                      skb->csum_offset == offsetof(struct tcphdr, check))) {
1802                         udp_sum = false;
1803                         type |= SKB_GSO_TUNNEL_REMCSUM;
1804                 }
1805         }
1806
1807         skb = iptunnel_handle_offloads(skb, udp_sum, type);
1808         if (IS_ERR(skb))
1809                 return PTR_ERR(skb);
1810
1811         min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
1812                         + VXLAN_HLEN + sizeof(struct iphdr)
1813                         + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
1814
1815         /* Need space for new headers (invalidates iph ptr) */
1816         err = skb_cow_head(skb, min_headroom);
1817         if (unlikely(err)) {
1818                 kfree_skb(skb);
1819                 return err;
1820         }
1821
1822         skb = vlan_hwaccel_push_inside(skb);
1823         if (WARN_ON(!skb))
1824                 return -ENOMEM;
1825
1826         vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1827         vxh->vx_flags = htonl(VXLAN_HF_VNI);
1828         vxh->vx_vni = md->vni;
1829
1830         if (type & SKB_GSO_TUNNEL_REMCSUM) {
1831                 u32 data = (skb_checksum_start_offset(skb) - hdrlen) >>
1832                            VXLAN_RCO_SHIFT;
1833
1834                 if (skb->csum_offset == offsetof(struct udphdr, check))
1835                         data |= VXLAN_RCO_UDP;
1836
1837                 vxh->vx_vni |= htonl(data);
1838                 vxh->vx_flags |= htonl(VXLAN_HF_RCO);
1839
1840                 if (!skb_is_gso(skb)) {
1841                         skb->ip_summed = CHECKSUM_NONE;
1842                         skb->encapsulation = 0;
1843                 }
1844         }
1845
1846         if (vxflags & VXLAN_F_GBP)
1847                 vxlan_build_gbp_hdr(vxh, vxflags, md);
1848
1849         skb_set_inner_protocol(skb, htons(ETH_P_TEB));
1850
1851         return udp_tunnel_xmit_skb(rt, skb, src, dst, tos,
1852                                    ttl, df, src_port, dst_port, xnet,
1853                                    !(vxflags & VXLAN_F_UDP_CSUM));
1854 }
1855 EXPORT_SYMBOL_GPL(vxlan_xmit_skb);
1856
1857 /* Bypass encapsulation if the destination is local */
1858 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
1859                                struct vxlan_dev *dst_vxlan)
1860 {
1861         struct pcpu_sw_netstats *tx_stats, *rx_stats;
1862         union vxlan_addr loopback;
1863         union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
1864         struct net_device *dev = skb->dev;
1865         int len = skb->len;
1866
1867         tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
1868         rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
1869         skb->pkt_type = PACKET_HOST;
1870         skb->encapsulation = 0;
1871         skb->dev = dst_vxlan->dev;
1872         __skb_pull(skb, skb_network_offset(skb));
1873
1874         if (remote_ip->sa.sa_family == AF_INET) {
1875                 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
1876                 loopback.sa.sa_family =  AF_INET;
1877 #if IS_ENABLED(CONFIG_IPV6)
1878         } else {
1879                 loopback.sin6.sin6_addr = in6addr_loopback;
1880                 loopback.sa.sa_family =  AF_INET6;
1881 #endif
1882         }
1883
1884         if (dst_vxlan->flags & VXLAN_F_LEARN)
1885                 vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source);
1886
1887         u64_stats_update_begin(&tx_stats->syncp);
1888         tx_stats->tx_packets++;
1889         tx_stats->tx_bytes += len;
1890         u64_stats_update_end(&tx_stats->syncp);
1891
1892         if (netif_rx(skb) == NET_RX_SUCCESS) {
1893                 u64_stats_update_begin(&rx_stats->syncp);
1894                 rx_stats->rx_packets++;
1895                 rx_stats->rx_bytes += len;
1896                 u64_stats_update_end(&rx_stats->syncp);
1897         } else {
1898                 dev->stats.rx_dropped++;
1899         }
1900 }
1901
1902 static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
1903                            struct vxlan_rdst *rdst, bool did_rsc)
1904 {
1905         struct vxlan_dev *vxlan = netdev_priv(dev);
1906         struct rtable *rt = NULL;
1907         const struct iphdr *old_iph;
1908         struct flowi4 fl4;
1909         union vxlan_addr *dst;
1910         struct vxlan_metadata md;
1911         __be16 src_port = 0, dst_port;
1912         u32 vni;
1913         __be16 df = 0;
1914         __u8 tos, ttl;
1915         int err;
1916
1917         dst_port = rdst->remote_port ? rdst->remote_port : vxlan->dst_port;
1918         vni = rdst->remote_vni;
1919         dst = &rdst->remote_ip;
1920
1921         if (vxlan_addr_any(dst)) {
1922                 if (did_rsc) {
1923                         /* short-circuited back to local bridge */
1924                         vxlan_encap_bypass(skb, vxlan, vxlan);
1925                         return;
1926                 }
1927                 goto drop;
1928         }
1929
1930         old_iph = ip_hdr(skb);
1931
1932         ttl = vxlan->ttl;
1933         if (!ttl && vxlan_addr_multicast(dst))
1934                 ttl = 1;
1935
1936         tos = vxlan->tos;
1937         if (tos == 1)
1938                 tos = ip_tunnel_get_dsfield(old_iph, skb);
1939
1940         src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->port_min,
1941                                      vxlan->port_max, true);
1942
1943         if (dst->sa.sa_family == AF_INET) {
1944                 memset(&fl4, 0, sizeof(fl4));
1945                 fl4.flowi4_oif = rdst->remote_ifindex;
1946                 fl4.flowi4_tos = RT_TOS(tos);
1947                 fl4.daddr = dst->sin.sin_addr.s_addr;
1948                 fl4.saddr = vxlan->saddr.sin.sin_addr.s_addr;
1949
1950                 rt = ip_route_output_key(vxlan->net, &fl4);
1951                 if (IS_ERR(rt)) {
1952                         netdev_dbg(dev, "no route to %pI4\n",
1953                                    &dst->sin.sin_addr.s_addr);
1954                         dev->stats.tx_carrier_errors++;
1955                         goto tx_error;
1956                 }
1957
1958                 if (rt->dst.dev == dev) {
1959                         netdev_dbg(dev, "circular route to %pI4\n",
1960                                    &dst->sin.sin_addr.s_addr);
1961                         dev->stats.collisions++;
1962                         goto rt_tx_error;
1963                 }
1964
1965                 /* Bypass encapsulation if the destination is local */
1966                 if (rt->rt_flags & RTCF_LOCAL &&
1967                     !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
1968                         struct vxlan_dev *dst_vxlan;
1969
1970                         ip_rt_put(rt);
1971                         dst_vxlan = vxlan_find_vni(vxlan->net, vni,
1972                                                    dst->sa.sa_family, dst_port,
1973                                                    vxlan->flags);
1974                         if (!dst_vxlan)
1975                                 goto tx_error;
1976                         vxlan_encap_bypass(skb, vxlan, dst_vxlan);
1977                         return;
1978                 }
1979
1980                 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
1981                 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
1982                 md.vni = htonl(vni << 8);
1983                 md.gbp = skb->mark;
1984
1985                 err = vxlan_xmit_skb(rt, skb, fl4.saddr,
1986                                      dst->sin.sin_addr.s_addr, tos, ttl, df,
1987                                      src_port, dst_port, &md,
1988                                      !net_eq(vxlan->net, dev_net(vxlan->dev)),
1989                                      vxlan->flags);
1990                 if (err < 0) {
1991                         /* skb is already freed. */
1992                         skb = NULL;
1993                         goto rt_tx_error;
1994                 }
1995
1996                 iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
1997 #if IS_ENABLED(CONFIG_IPV6)
1998         } else {
1999                 struct sock *sk = vxlan->vn_sock->sock->sk;
2000                 struct dst_entry *ndst;
2001                 struct flowi6 fl6;
2002                 u32 flags;
2003
2004                 memset(&fl6, 0, sizeof(fl6));
2005                 fl6.flowi6_oif = rdst->remote_ifindex;
2006                 fl6.daddr = dst->sin6.sin6_addr;
2007                 fl6.saddr = vxlan->saddr.sin6.sin6_addr;
2008                 fl6.flowi6_proto = IPPROTO_UDP;
2009
2010                 if (ipv6_stub->ipv6_dst_lookup(sk, &ndst, &fl6)) {
2011                         netdev_dbg(dev, "no route to %pI6\n",
2012                                    &dst->sin6.sin6_addr);
2013                         dev->stats.tx_carrier_errors++;
2014                         goto tx_error;
2015                 }
2016
2017                 if (ndst->dev == dev) {
2018                         netdev_dbg(dev, "circular route to %pI6\n",
2019                                    &dst->sin6.sin6_addr);
2020                         dst_release(ndst);
2021                         dev->stats.collisions++;
2022                         goto tx_error;
2023                 }
2024
2025                 /* Bypass encapsulation if the destination is local */
2026                 flags = ((struct rt6_info *)ndst)->rt6i_flags;
2027                 if (flags & RTF_LOCAL &&
2028                     !(flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2029                         struct vxlan_dev *dst_vxlan;
2030
2031                         dst_release(ndst);
2032                         dst_vxlan = vxlan_find_vni(vxlan->net, vni,
2033                                                    dst->sa.sa_family, dst_port,
2034                                                    vxlan->flags);
2035                         if (!dst_vxlan)
2036                                 goto tx_error;
2037                         vxlan_encap_bypass(skb, vxlan, dst_vxlan);
2038                         return;
2039                 }
2040
2041                 ttl = ttl ? : ip6_dst_hoplimit(ndst);
2042                 md.vni = htonl(vni << 8);
2043                 md.gbp = skb->mark;
2044
2045                 err = vxlan6_xmit_skb(ndst, skb, dev, &fl6.saddr, &fl6.daddr,
2046                                       0, ttl, src_port, dst_port, &md,
2047                                       !net_eq(vxlan->net, dev_net(vxlan->dev)),
2048                                       vxlan->flags);
2049 #endif
2050         }
2051
2052         return;
2053
2054 drop:
2055         dev->stats.tx_dropped++;
2056         goto tx_free;
2057
2058 rt_tx_error:
2059         ip_rt_put(rt);
2060 tx_error:
2061         dev->stats.tx_errors++;
2062 tx_free:
2063         dev_kfree_skb(skb);
2064 }
2065
2066 /* Transmit local packets over Vxlan
2067  *
2068  * Outer IP header inherits ECN and DF from inner header.
2069  * Outer UDP destination is the VXLAN assigned port.
2070  *           source port is based on hash of flow
2071  */
2072 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
2073 {
2074         struct vxlan_dev *vxlan = netdev_priv(dev);
2075         struct ethhdr *eth;
2076         bool did_rsc = false;
2077         struct vxlan_rdst *rdst, *fdst = NULL;
2078         struct vxlan_fdb *f;
2079
2080         skb_reset_mac_header(skb);
2081         eth = eth_hdr(skb);
2082
2083         if ((vxlan->flags & VXLAN_F_PROXY)) {
2084                 if (ntohs(eth->h_proto) == ETH_P_ARP)
2085                         return arp_reduce(dev, skb);
2086 #if IS_ENABLED(CONFIG_IPV6)
2087                 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
2088                          pskb_may_pull(skb, sizeof(struct ipv6hdr)
2089                                        + sizeof(struct nd_msg)) &&
2090                          ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
2091                                 struct nd_msg *msg;
2092
2093                                 msg = (struct nd_msg *)skb_transport_header(skb);
2094                                 if (msg->icmph.icmp6_code == 0 &&
2095                                     msg->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
2096                                         return neigh_reduce(dev, skb);
2097                 }
2098                 eth = eth_hdr(skb);
2099 #endif
2100         }
2101
2102         f = vxlan_find_mac(vxlan, eth->h_dest);
2103         did_rsc = false;
2104
2105         if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) &&
2106             (ntohs(eth->h_proto) == ETH_P_IP ||
2107              ntohs(eth->h_proto) == ETH_P_IPV6)) {
2108                 did_rsc = route_shortcircuit(dev, skb);
2109                 if (did_rsc)
2110                         f = vxlan_find_mac(vxlan, eth->h_dest);
2111         }
2112
2113         if (f == NULL) {
2114                 f = vxlan_find_mac(vxlan, all_zeros_mac);
2115                 if (f == NULL) {
2116                         if ((vxlan->flags & VXLAN_F_L2MISS) &&
2117                             !is_multicast_ether_addr(eth->h_dest))
2118                                 vxlan_fdb_miss(vxlan, eth->h_dest);
2119
2120                         dev->stats.tx_dropped++;
2121                         kfree_skb(skb);
2122                         return NETDEV_TX_OK;
2123                 }
2124         }
2125
2126         list_for_each_entry_rcu(rdst, &f->remotes, list) {
2127                 struct sk_buff *skb1;
2128
2129                 if (!fdst) {
2130                         fdst = rdst;
2131                         continue;
2132                 }
2133                 skb1 = skb_clone(skb, GFP_ATOMIC);
2134                 if (skb1)
2135                         vxlan_xmit_one(skb1, dev, rdst, did_rsc);
2136         }
2137
2138         if (fdst)
2139                 vxlan_xmit_one(skb, dev, fdst, did_rsc);
2140         else
2141                 kfree_skb(skb);
2142         return NETDEV_TX_OK;
2143 }
2144
2145 /* Walk the forwarding table and purge stale entries */
2146 static void vxlan_cleanup(unsigned long arg)
2147 {
2148         struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
2149         unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2150         unsigned int h;
2151
2152         if (!netif_running(vxlan->dev))
2153                 return;
2154
2155         spin_lock_bh(&vxlan->hash_lock);
2156         for (h = 0; h < FDB_HASH_SIZE; ++h) {
2157                 struct hlist_node *p, *n;
2158                 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2159                         struct vxlan_fdb *f
2160                                 = container_of(p, struct vxlan_fdb, hlist);
2161                         unsigned long timeout;
2162
2163                         if (f->state & NUD_PERMANENT)
2164                                 continue;
2165
2166                         timeout = f->used + vxlan->age_interval * HZ;
2167                         if (time_before_eq(timeout, jiffies)) {
2168                                 netdev_dbg(vxlan->dev,
2169                                            "garbage collect %pM\n",
2170                                            f->eth_addr);
2171                                 f->state = NUD_STALE;
2172                                 vxlan_fdb_destroy(vxlan, f);
2173                         } else if (time_before(timeout, next_timer))
2174                                 next_timer = timeout;
2175                 }
2176         }
2177         spin_unlock_bh(&vxlan->hash_lock);
2178
2179         mod_timer(&vxlan->age_timer, next_timer);
2180 }
2181
2182 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan)
2183 {
2184         __u32 vni = vxlan->default_dst.remote_vni;
2185
2186         vxlan->vn_sock = vs;
2187         hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
2188 }
2189
2190 /* Setup stats when device is created */
2191 static int vxlan_init(struct net_device *dev)
2192 {
2193         struct vxlan_dev *vxlan = netdev_priv(dev);
2194         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2195         struct vxlan_sock *vs;
2196         bool ipv6 = vxlan->flags & VXLAN_F_IPV6;
2197
2198         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2199         if (!dev->tstats)
2200                 return -ENOMEM;
2201
2202         spin_lock(&vn->sock_lock);
2203         vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
2204                              vxlan->dst_port, vxlan->flags);
2205         if (vs && atomic_add_unless(&vs->refcnt, 1, 0)) {
2206                 /* If we have a socket with same port already, reuse it */
2207                 vxlan_vs_add_dev(vs, vxlan);
2208         } else {
2209                 /* otherwise make new socket outside of RTNL */
2210                 dev_hold(dev);
2211                 queue_work(vxlan_wq, &vxlan->sock_work);
2212         }
2213         spin_unlock(&vn->sock_lock);
2214
2215         return 0;
2216 }
2217
2218 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan)
2219 {
2220         struct vxlan_fdb *f;
2221
2222         spin_lock_bh(&vxlan->hash_lock);
2223         f = __vxlan_find_mac(vxlan, all_zeros_mac);
2224         if (f)
2225                 vxlan_fdb_destroy(vxlan, f);
2226         spin_unlock_bh(&vxlan->hash_lock);
2227 }
2228
2229 static void vxlan_uninit(struct net_device *dev)
2230 {
2231         struct vxlan_dev *vxlan = netdev_priv(dev);
2232         struct vxlan_sock *vs = vxlan->vn_sock;
2233
2234         vxlan_fdb_delete_default(vxlan);
2235
2236         if (vs)
2237                 vxlan_sock_release(vs);
2238         free_percpu(dev->tstats);
2239 }
2240
2241 /* Start ageing timer and join group when device is brought up */
2242 static int vxlan_open(struct net_device *dev)
2243 {
2244         struct vxlan_dev *vxlan = netdev_priv(dev);
2245         struct vxlan_sock *vs = vxlan->vn_sock;
2246
2247         /* socket hasn't been created */
2248         if (!vs)
2249                 return -ENOTCONN;
2250
2251         if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
2252                 vxlan_sock_hold(vs);
2253                 dev_hold(dev);
2254                 queue_work(vxlan_wq, &vxlan->igmp_join);
2255         }
2256
2257         if (vxlan->age_interval)
2258                 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2259
2260         return 0;
2261 }
2262
2263 /* Purge the forwarding table */
2264 static void vxlan_flush(struct vxlan_dev *vxlan)
2265 {
2266         unsigned int h;
2267
2268         spin_lock_bh(&vxlan->hash_lock);
2269         for (h = 0; h < FDB_HASH_SIZE; ++h) {
2270                 struct hlist_node *p, *n;
2271                 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2272                         struct vxlan_fdb *f
2273                                 = container_of(p, struct vxlan_fdb, hlist);
2274                         /* the all_zeros_mac entry is deleted at vxlan_uninit */
2275                         if (!is_zero_ether_addr(f->eth_addr))
2276                                 vxlan_fdb_destroy(vxlan, f);
2277                 }
2278         }
2279         spin_unlock_bh(&vxlan->hash_lock);
2280 }
2281
2282 /* Cleanup timer and forwarding table on shutdown */
2283 static int vxlan_stop(struct net_device *dev)
2284 {
2285         struct vxlan_dev *vxlan = netdev_priv(dev);
2286         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2287         struct vxlan_sock *vs = vxlan->vn_sock;
2288
2289         if (vs && vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
2290             !vxlan_group_used(vn, vxlan)) {
2291                 vxlan_sock_hold(vs);
2292                 dev_hold(dev);
2293                 queue_work(vxlan_wq, &vxlan->igmp_leave);
2294         }
2295
2296         del_timer_sync(&vxlan->age_timer);
2297
2298         vxlan_flush(vxlan);
2299
2300         return 0;
2301 }
2302
2303 /* Stub, nothing needs to be done. */
2304 static void vxlan_set_multicast_list(struct net_device *dev)
2305 {
2306 }
2307
2308 static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2309 {
2310         struct vxlan_dev *vxlan = netdev_priv(dev);
2311         struct vxlan_rdst *dst = &vxlan->default_dst;
2312         struct net_device *lowerdev;
2313         int max_mtu;
2314
2315         lowerdev = __dev_get_by_index(vxlan->net, dst->remote_ifindex);
2316         if (lowerdev == NULL)
2317                 return eth_change_mtu(dev, new_mtu);
2318
2319         if (dst->remote_ip.sa.sa_family == AF_INET6)
2320                 max_mtu = lowerdev->mtu - VXLAN6_HEADROOM;
2321         else
2322                 max_mtu = lowerdev->mtu - VXLAN_HEADROOM;
2323
2324         if (new_mtu < 68 || new_mtu > max_mtu)
2325                 return -EINVAL;
2326
2327         dev->mtu = new_mtu;
2328         return 0;
2329 }
2330
2331 static const struct net_device_ops vxlan_netdev_ops = {
2332         .ndo_init               = vxlan_init,
2333         .ndo_uninit             = vxlan_uninit,
2334         .ndo_open               = vxlan_open,
2335         .ndo_stop               = vxlan_stop,
2336         .ndo_start_xmit         = vxlan_xmit,
2337         .ndo_get_stats64        = ip_tunnel_get_stats64,
2338         .ndo_set_rx_mode        = vxlan_set_multicast_list,
2339         .ndo_change_mtu         = vxlan_change_mtu,
2340         .ndo_validate_addr      = eth_validate_addr,
2341         .ndo_set_mac_address    = eth_mac_addr,
2342         .ndo_fdb_add            = vxlan_fdb_add,
2343         .ndo_fdb_del            = vxlan_fdb_delete,
2344         .ndo_fdb_dump           = vxlan_fdb_dump,
2345 };
2346
2347 /* Info for udev, that this is a virtual tunnel endpoint */
2348 static struct device_type vxlan_type = {
2349         .name = "vxlan",
2350 };
2351
2352 /* Calls the ndo_add_vxlan_port of the caller in order to
2353  * supply the listening VXLAN udp ports. Callers are expected
2354  * to implement the ndo_add_vxlan_port.
2355  */
2356 void vxlan_get_rx_port(struct net_device *dev)
2357 {
2358         struct vxlan_sock *vs;
2359         struct net *net = dev_net(dev);
2360         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2361         sa_family_t sa_family;
2362         __be16 port;
2363         unsigned int i;
2364
2365         spin_lock(&vn->sock_lock);
2366         for (i = 0; i < PORT_HASH_SIZE; ++i) {
2367                 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
2368                         port = inet_sk(vs->sock->sk)->inet_sport;
2369                         sa_family = vs->sock->sk->sk_family;
2370                         dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
2371                                                             port);
2372                 }
2373         }
2374         spin_unlock(&vn->sock_lock);
2375 }
2376 EXPORT_SYMBOL_GPL(vxlan_get_rx_port);
2377
2378 /* Initialize the device structure. */
2379 static void vxlan_setup(struct net_device *dev)
2380 {
2381         struct vxlan_dev *vxlan = netdev_priv(dev);
2382         unsigned int h;
2383
2384         eth_hw_addr_random(dev);
2385         ether_setup(dev);
2386         if (vxlan->default_dst.remote_ip.sa.sa_family == AF_INET6)
2387                 dev->needed_headroom = ETH_HLEN + VXLAN6_HEADROOM;
2388         else
2389                 dev->needed_headroom = ETH_HLEN + VXLAN_HEADROOM;
2390
2391         dev->netdev_ops = &vxlan_netdev_ops;
2392         dev->destructor = free_netdev;
2393         SET_NETDEV_DEVTYPE(dev, &vxlan_type);
2394
2395         dev->tx_queue_len = 0;
2396         dev->features   |= NETIF_F_LLTX;
2397         dev->features   |= NETIF_F_SG | NETIF_F_HW_CSUM;
2398         dev->features   |= NETIF_F_RXCSUM;
2399         dev->features   |= NETIF_F_GSO_SOFTWARE;
2400
2401         dev->vlan_features = dev->features;
2402         dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2403         dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
2404         dev->hw_features |= NETIF_F_GSO_SOFTWARE;
2405         dev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2406         netif_keep_dst(dev);
2407         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2408
2409         INIT_LIST_HEAD(&vxlan->next);
2410         spin_lock_init(&vxlan->hash_lock);
2411         INIT_WORK(&vxlan->igmp_join, vxlan_igmp_join);
2412         INIT_WORK(&vxlan->igmp_leave, vxlan_igmp_leave);
2413         INIT_WORK(&vxlan->sock_work, vxlan_sock_work);
2414
2415         init_timer_deferrable(&vxlan->age_timer);
2416         vxlan->age_timer.function = vxlan_cleanup;
2417         vxlan->age_timer.data = (unsigned long) vxlan;
2418
2419         vxlan->dst_port = htons(vxlan_port);
2420
2421         vxlan->dev = dev;
2422
2423         for (h = 0; h < FDB_HASH_SIZE; ++h)
2424                 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
2425 }
2426
2427 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
2428         [IFLA_VXLAN_ID]         = { .type = NLA_U32 },
2429         [IFLA_VXLAN_GROUP]      = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
2430         [IFLA_VXLAN_GROUP6]     = { .len = sizeof(struct in6_addr) },
2431         [IFLA_VXLAN_LINK]       = { .type = NLA_U32 },
2432         [IFLA_VXLAN_LOCAL]      = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
2433         [IFLA_VXLAN_LOCAL6]     = { .len = sizeof(struct in6_addr) },
2434         [IFLA_VXLAN_TOS]        = { .type = NLA_U8 },
2435         [IFLA_VXLAN_TTL]        = { .type = NLA_U8 },
2436         [IFLA_VXLAN_LEARNING]   = { .type = NLA_U8 },
2437         [IFLA_VXLAN_AGEING]     = { .type = NLA_U32 },
2438         [IFLA_VXLAN_LIMIT]      = { .type = NLA_U32 },
2439         [IFLA_VXLAN_PORT_RANGE] = { .len  = sizeof(struct ifla_vxlan_port_range) },
2440         [IFLA_VXLAN_PROXY]      = { .type = NLA_U8 },
2441         [IFLA_VXLAN_RSC]        = { .type = NLA_U8 },
2442         [IFLA_VXLAN_L2MISS]     = { .type = NLA_U8 },
2443         [IFLA_VXLAN_L3MISS]     = { .type = NLA_U8 },
2444         [IFLA_VXLAN_PORT]       = { .type = NLA_U16 },
2445         [IFLA_VXLAN_UDP_CSUM]   = { .type = NLA_U8 },
2446         [IFLA_VXLAN_UDP_ZERO_CSUM6_TX]  = { .type = NLA_U8 },
2447         [IFLA_VXLAN_UDP_ZERO_CSUM6_RX]  = { .type = NLA_U8 },
2448         [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 },
2449         [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
2450         [IFLA_VXLAN_GBP]        = { .type = NLA_FLAG, },
2451 };
2452
2453 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
2454 {
2455         if (tb[IFLA_ADDRESS]) {
2456                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
2457                         pr_debug("invalid link address (not ethernet)\n");
2458                         return -EINVAL;
2459                 }
2460
2461                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
2462                         pr_debug("invalid all zero ethernet address\n");
2463                         return -EADDRNOTAVAIL;
2464                 }
2465         }
2466
2467         if (!data)
2468                 return -EINVAL;
2469
2470         if (data[IFLA_VXLAN_ID]) {
2471                 __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
2472                 if (id >= VXLAN_VID_MASK)
2473                         return -ERANGE;
2474         }
2475
2476         if (data[IFLA_VXLAN_PORT_RANGE]) {
2477                 const struct ifla_vxlan_port_range *p
2478                         = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2479
2480                 if (ntohs(p->high) < ntohs(p->low)) {
2481                         pr_debug("port range %u .. %u not valid\n",
2482                                  ntohs(p->low), ntohs(p->high));
2483                         return -EINVAL;
2484                 }
2485         }
2486
2487         return 0;
2488 }
2489
2490 static void vxlan_get_drvinfo(struct net_device *netdev,
2491                               struct ethtool_drvinfo *drvinfo)
2492 {
2493         strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
2494         strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
2495 }
2496
2497 static const struct ethtool_ops vxlan_ethtool_ops = {
2498         .get_drvinfo    = vxlan_get_drvinfo,
2499         .get_link       = ethtool_op_get_link,
2500 };
2501
2502 static void vxlan_del_work(struct work_struct *work)
2503 {
2504         struct vxlan_sock *vs = container_of(work, struct vxlan_sock, del_work);
2505         udp_tunnel_sock_release(vs->sock);
2506         kfree_rcu(vs, rcu);
2507 }
2508
2509 static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
2510                                         __be16 port, u32 flags)
2511 {
2512         struct socket *sock;
2513         struct udp_port_cfg udp_conf;
2514         int err;
2515
2516         memset(&udp_conf, 0, sizeof(udp_conf));
2517
2518         if (ipv6) {
2519                 udp_conf.family = AF_INET6;
2520                 udp_conf.use_udp6_rx_checksums =
2521                     !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
2522         } else {
2523                 udp_conf.family = AF_INET;
2524                 udp_conf.local_ip.s_addr = INADDR_ANY;
2525         }
2526
2527         udp_conf.local_udp_port = port;
2528
2529         /* Open UDP socket */
2530         err = udp_sock_create(net, &udp_conf, &sock);
2531         if (err < 0)
2532                 return ERR_PTR(err);
2533
2534         return sock;
2535 }
2536
2537 /* Create new listen socket if needed */
2538 static struct vxlan_sock *vxlan_socket_create(struct net *net, __be16 port,
2539                                               vxlan_rcv_t *rcv, void *data,
2540                                               u32 flags)
2541 {
2542         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2543         struct vxlan_sock *vs;
2544         struct socket *sock;
2545         unsigned int h;
2546         bool ipv6 = !!(flags & VXLAN_F_IPV6);
2547         struct udp_tunnel_sock_cfg tunnel_cfg;
2548
2549         vs = kzalloc(sizeof(*vs), GFP_KERNEL);
2550         if (!vs)
2551                 return ERR_PTR(-ENOMEM);
2552
2553         for (h = 0; h < VNI_HASH_SIZE; ++h)
2554                 INIT_HLIST_HEAD(&vs->vni_list[h]);
2555
2556         INIT_WORK(&vs->del_work, vxlan_del_work);
2557
2558         sock = vxlan_create_sock(net, ipv6, port, flags);
2559         if (IS_ERR(sock)) {
2560                 kfree(vs);
2561                 return ERR_CAST(sock);
2562         }
2563
2564         vs->sock = sock;
2565         atomic_set(&vs->refcnt, 1);
2566         vs->rcv = rcv;
2567         vs->data = data;
2568         vs->flags = (flags & VXLAN_F_RCV_FLAGS);
2569
2570         /* Initialize the vxlan udp offloads structure */
2571         vs->udp_offloads.port = port;
2572         vs->udp_offloads.callbacks.gro_receive  = vxlan_gro_receive;
2573         vs->udp_offloads.callbacks.gro_complete = vxlan_gro_complete;
2574
2575         spin_lock(&vn->sock_lock);
2576         hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
2577         vxlan_notify_add_rx_port(vs);
2578         spin_unlock(&vn->sock_lock);
2579
2580         /* Mark socket as an encapsulation socket. */
2581         tunnel_cfg.sk_user_data = vs;
2582         tunnel_cfg.encap_type = 1;
2583         tunnel_cfg.encap_rcv = vxlan_udp_encap_recv;
2584         tunnel_cfg.encap_destroy = NULL;
2585
2586         setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
2587
2588         return vs;
2589 }
2590
2591 struct vxlan_sock *vxlan_sock_add(struct net *net, __be16 port,
2592                                   vxlan_rcv_t *rcv, void *data,
2593                                   bool no_share, u32 flags)
2594 {
2595         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2596         struct vxlan_sock *vs;
2597         bool ipv6 = flags & VXLAN_F_IPV6;
2598
2599         vs = vxlan_socket_create(net, port, rcv, data, flags);
2600         if (!IS_ERR(vs))
2601                 return vs;
2602
2603         if (no_share)   /* Return error if sharing is not allowed. */
2604                 return vs;
2605
2606         spin_lock(&vn->sock_lock);
2607         vs = vxlan_find_sock(net, ipv6 ? AF_INET6 : AF_INET, port, flags);
2608         if (vs && ((vs->rcv != rcv) ||
2609                    !atomic_add_unless(&vs->refcnt, 1, 0)))
2610                         vs = ERR_PTR(-EBUSY);
2611         spin_unlock(&vn->sock_lock);
2612
2613         if (!vs)
2614                 vs = ERR_PTR(-EINVAL);
2615
2616         return vs;
2617 }
2618 EXPORT_SYMBOL_GPL(vxlan_sock_add);
2619
2620 /* Scheduled at device creation to bind to a socket */
2621 static void vxlan_sock_work(struct work_struct *work)
2622 {
2623         struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, sock_work);
2624         struct net *net = vxlan->net;
2625         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2626         __be16 port = vxlan->dst_port;
2627         struct vxlan_sock *nvs;
2628
2629         nvs = vxlan_sock_add(net, port, vxlan_rcv, NULL, false, vxlan->flags);
2630         spin_lock(&vn->sock_lock);
2631         if (!IS_ERR(nvs))
2632                 vxlan_vs_add_dev(nvs, vxlan);
2633         spin_unlock(&vn->sock_lock);
2634
2635         dev_put(vxlan->dev);
2636 }
2637
2638 static int vxlan_newlink(struct net *net, struct net_device *dev,
2639                          struct nlattr *tb[], struct nlattr *data[])
2640 {
2641         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2642         struct vxlan_dev *vxlan = netdev_priv(dev);
2643         struct vxlan_rdst *dst = &vxlan->default_dst;
2644         __u32 vni;
2645         int err;
2646         bool use_ipv6 = false;
2647
2648         if (!data[IFLA_VXLAN_ID])
2649                 return -EINVAL;
2650
2651         vxlan->net = dev_net(dev);
2652
2653         vni = nla_get_u32(data[IFLA_VXLAN_ID]);
2654         dst->remote_vni = vni;
2655
2656         /* Unless IPv6 is explicitly requested, assume IPv4 */
2657         dst->remote_ip.sa.sa_family = AF_INET;
2658         if (data[IFLA_VXLAN_GROUP]) {
2659                 dst->remote_ip.sin.sin_addr.s_addr = nla_get_be32(data[IFLA_VXLAN_GROUP]);
2660         } else if (data[IFLA_VXLAN_GROUP6]) {
2661                 if (!IS_ENABLED(CONFIG_IPV6))
2662                         return -EPFNOSUPPORT;
2663
2664                 nla_memcpy(&dst->remote_ip.sin6.sin6_addr, data[IFLA_VXLAN_GROUP6],
2665                            sizeof(struct in6_addr));
2666                 dst->remote_ip.sa.sa_family = AF_INET6;
2667                 use_ipv6 = true;
2668         }
2669
2670         if (data[IFLA_VXLAN_LOCAL]) {
2671                 vxlan->saddr.sin.sin_addr.s_addr = nla_get_be32(data[IFLA_VXLAN_LOCAL]);
2672                 vxlan->saddr.sa.sa_family = AF_INET;
2673         } else if (data[IFLA_VXLAN_LOCAL6]) {
2674                 if (!IS_ENABLED(CONFIG_IPV6))
2675                         return -EPFNOSUPPORT;
2676
2677                 /* TODO: respect scope id */
2678                 nla_memcpy(&vxlan->saddr.sin6.sin6_addr, data[IFLA_VXLAN_LOCAL6],
2679                            sizeof(struct in6_addr));
2680                 vxlan->saddr.sa.sa_family = AF_INET6;
2681                 use_ipv6 = true;
2682         }
2683
2684         if (data[IFLA_VXLAN_LINK] &&
2685             (dst->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]))) {
2686                 struct net_device *lowerdev
2687                          = __dev_get_by_index(net, dst->remote_ifindex);
2688
2689                 if (!lowerdev) {
2690                         pr_info("ifindex %d does not exist\n", dst->remote_ifindex);
2691                         return -ENODEV;
2692                 }
2693
2694 #if IS_ENABLED(CONFIG_IPV6)
2695                 if (use_ipv6) {
2696                         struct inet6_dev *idev = __in6_dev_get(lowerdev);
2697                         if (idev && idev->cnf.disable_ipv6) {
2698                                 pr_info("IPv6 is disabled via sysctl\n");
2699                                 return -EPERM;
2700                         }
2701                         vxlan->flags |= VXLAN_F_IPV6;
2702                 }
2703 #endif
2704
2705                 if (!tb[IFLA_MTU])
2706                         dev->mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2707
2708                 dev->needed_headroom = lowerdev->hard_header_len +
2709                                        (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2710         } else if (use_ipv6)
2711                 vxlan->flags |= VXLAN_F_IPV6;
2712
2713         if (data[IFLA_VXLAN_TOS])
2714                 vxlan->tos  = nla_get_u8(data[IFLA_VXLAN_TOS]);
2715
2716         if (data[IFLA_VXLAN_TTL])
2717                 vxlan->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
2718
2719         if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING]))
2720                 vxlan->flags |= VXLAN_F_LEARN;
2721
2722         if (data[IFLA_VXLAN_AGEING])
2723                 vxlan->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
2724         else
2725                 vxlan->age_interval = FDB_AGE_DEFAULT;
2726
2727         if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY]))
2728                 vxlan->flags |= VXLAN_F_PROXY;
2729
2730         if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC]))
2731                 vxlan->flags |= VXLAN_F_RSC;
2732
2733         if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS]))
2734                 vxlan->flags |= VXLAN_F_L2MISS;
2735
2736         if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS]))
2737                 vxlan->flags |= VXLAN_F_L3MISS;
2738
2739         if (data[IFLA_VXLAN_LIMIT])
2740                 vxlan->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
2741
2742         if (data[IFLA_VXLAN_PORT_RANGE]) {
2743                 const struct ifla_vxlan_port_range *p
2744                         = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2745                 vxlan->port_min = ntohs(p->low);
2746                 vxlan->port_max = ntohs(p->high);
2747         }
2748
2749         if (data[IFLA_VXLAN_PORT])
2750                 vxlan->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
2751
2752         if (data[IFLA_VXLAN_UDP_CSUM] && nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
2753                 vxlan->flags |= VXLAN_F_UDP_CSUM;
2754
2755         if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX] &&
2756             nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
2757                 vxlan->flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
2758
2759         if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX] &&
2760             nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
2761                 vxlan->flags |= VXLAN_F_UDP_ZERO_CSUM6_RX;
2762
2763         if (data[IFLA_VXLAN_REMCSUM_TX] &&
2764             nla_get_u8(data[IFLA_VXLAN_REMCSUM_TX]))
2765                 vxlan->flags |= VXLAN_F_REMCSUM_TX;
2766
2767         if (data[IFLA_VXLAN_REMCSUM_RX] &&
2768             nla_get_u8(data[IFLA_VXLAN_REMCSUM_RX]))
2769                 vxlan->flags |= VXLAN_F_REMCSUM_RX;
2770
2771         if (data[IFLA_VXLAN_GBP])
2772                 vxlan->flags |= VXLAN_F_GBP;
2773
2774         if (vxlan_find_vni(net, vni, use_ipv6 ? AF_INET6 : AF_INET,
2775                            vxlan->dst_port, vxlan->flags)) {
2776                 pr_info("duplicate VNI %u\n", vni);
2777                 return -EEXIST;
2778         }
2779
2780         dev->ethtool_ops = &vxlan_ethtool_ops;
2781
2782         /* create an fdb entry for a valid default destination */
2783         if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
2784                 err = vxlan_fdb_create(vxlan, all_zeros_mac,
2785                                        &vxlan->default_dst.remote_ip,
2786                                        NUD_REACHABLE|NUD_PERMANENT,
2787                                        NLM_F_EXCL|NLM_F_CREATE,
2788                                        vxlan->dst_port,
2789                                        vxlan->default_dst.remote_vni,
2790                                        vxlan->default_dst.remote_ifindex,
2791                                        NTF_SELF);
2792                 if (err)
2793                         return err;
2794         }
2795
2796         err = register_netdevice(dev);
2797         if (err) {
2798                 vxlan_fdb_delete_default(vxlan);
2799                 return err;
2800         }
2801
2802         list_add(&vxlan->next, &vn->vxlan_list);
2803
2804         return 0;
2805 }
2806
2807 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
2808 {
2809         struct vxlan_dev *vxlan = netdev_priv(dev);
2810         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2811
2812         spin_lock(&vn->sock_lock);
2813         if (!hlist_unhashed(&vxlan->hlist))
2814                 hlist_del_rcu(&vxlan->hlist);
2815         spin_unlock(&vn->sock_lock);
2816
2817         list_del(&vxlan->next);
2818         unregister_netdevice_queue(dev, head);
2819 }
2820
2821 static size_t vxlan_get_size(const struct net_device *dev)
2822 {
2823
2824         return nla_total_size(sizeof(__u32)) +  /* IFLA_VXLAN_ID */
2825                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
2826                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
2827                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
2828                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TTL */
2829                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TOS */
2830                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_LEARNING */
2831                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_PROXY */
2832                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_RSC */
2833                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_L2MISS */
2834                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_L3MISS */
2835                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
2836                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
2837                 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
2838                 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
2839                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
2840                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
2841                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
2842                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
2843                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
2844                 0;
2845 }
2846
2847 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
2848 {
2849         const struct vxlan_dev *vxlan = netdev_priv(dev);
2850         const struct vxlan_rdst *dst = &vxlan->default_dst;
2851         struct ifla_vxlan_port_range ports = {
2852                 .low =  htons(vxlan->port_min),
2853                 .high = htons(vxlan->port_max),
2854         };
2855
2856         if (nla_put_u32(skb, IFLA_VXLAN_ID, dst->remote_vni))
2857                 goto nla_put_failure;
2858
2859         if (!vxlan_addr_any(&dst->remote_ip)) {
2860                 if (dst->remote_ip.sa.sa_family == AF_INET) {
2861                         if (nla_put_be32(skb, IFLA_VXLAN_GROUP,
2862                                          dst->remote_ip.sin.sin_addr.s_addr))
2863                                 goto nla_put_failure;
2864 #if IS_ENABLED(CONFIG_IPV6)
2865                 } else {
2866                         if (nla_put(skb, IFLA_VXLAN_GROUP6, sizeof(struct in6_addr),
2867                                     &dst->remote_ip.sin6.sin6_addr))
2868                                 goto nla_put_failure;
2869 #endif
2870                 }
2871         }
2872
2873         if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
2874                 goto nla_put_failure;
2875
2876         if (!vxlan_addr_any(&vxlan->saddr)) {
2877                 if (vxlan->saddr.sa.sa_family == AF_INET) {
2878                         if (nla_put_be32(skb, IFLA_VXLAN_LOCAL,
2879                                          vxlan->saddr.sin.sin_addr.s_addr))
2880                                 goto nla_put_failure;
2881 #if IS_ENABLED(CONFIG_IPV6)
2882                 } else {
2883                         if (nla_put(skb, IFLA_VXLAN_LOCAL6, sizeof(struct in6_addr),
2884                                     &vxlan->saddr.sin6.sin6_addr))
2885                                 goto nla_put_failure;
2886 #endif
2887                 }
2888         }
2889
2890         if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->ttl) ||
2891             nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->tos) ||
2892             nla_put_u8(skb, IFLA_VXLAN_LEARNING,
2893                         !!(vxlan->flags & VXLAN_F_LEARN)) ||
2894             nla_put_u8(skb, IFLA_VXLAN_PROXY,
2895                         !!(vxlan->flags & VXLAN_F_PROXY)) ||
2896             nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) ||
2897             nla_put_u8(skb, IFLA_VXLAN_L2MISS,
2898                         !!(vxlan->flags & VXLAN_F_L2MISS)) ||
2899             nla_put_u8(skb, IFLA_VXLAN_L3MISS,
2900                         !!(vxlan->flags & VXLAN_F_L3MISS)) ||
2901             nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->age_interval) ||
2902             nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->addrmax) ||
2903             nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->dst_port) ||
2904             nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
2905                         !!(vxlan->flags & VXLAN_F_UDP_CSUM)) ||
2906             nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
2907                         !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
2908             nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
2909                         !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
2910             nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
2911                         !!(vxlan->flags & VXLAN_F_REMCSUM_TX)) ||
2912             nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
2913                         !!(vxlan->flags & VXLAN_F_REMCSUM_RX)))
2914                 goto nla_put_failure;
2915
2916         if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
2917                 goto nla_put_failure;
2918
2919         if (vxlan->flags & VXLAN_F_GBP &&
2920             nla_put_flag(skb, IFLA_VXLAN_GBP))
2921                 goto nla_put_failure;
2922
2923         return 0;
2924
2925 nla_put_failure:
2926         return -EMSGSIZE;
2927 }
2928
2929 static struct net *vxlan_get_link_net(const struct net_device *dev)
2930 {
2931         struct vxlan_dev *vxlan = netdev_priv(dev);
2932
2933         return vxlan->net;
2934 }
2935
2936 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
2937         .kind           = "vxlan",
2938         .maxtype        = IFLA_VXLAN_MAX,
2939         .policy         = vxlan_policy,
2940         .priv_size      = sizeof(struct vxlan_dev),
2941         .setup          = vxlan_setup,
2942         .validate       = vxlan_validate,
2943         .newlink        = vxlan_newlink,
2944         .dellink        = vxlan_dellink,
2945         .get_size       = vxlan_get_size,
2946         .fill_info      = vxlan_fill_info,
2947         .get_link_net   = vxlan_get_link_net,
2948 };
2949
2950 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
2951                                              struct net_device *dev)
2952 {
2953         struct vxlan_dev *vxlan, *next;
2954         LIST_HEAD(list_kill);
2955
2956         list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
2957                 struct vxlan_rdst *dst = &vxlan->default_dst;
2958
2959                 /* In case we created vxlan device with carrier
2960                  * and we loose the carrier due to module unload
2961                  * we also need to remove vxlan device. In other
2962                  * cases, it's not necessary and remote_ifindex
2963                  * is 0 here, so no matches.
2964                  */
2965                 if (dst->remote_ifindex == dev->ifindex)
2966                         vxlan_dellink(vxlan->dev, &list_kill);
2967         }
2968
2969         unregister_netdevice_many(&list_kill);
2970 }
2971
2972 static int vxlan_lowerdev_event(struct notifier_block *unused,
2973                                 unsigned long event, void *ptr)
2974 {
2975         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2976         struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
2977
2978         if (event == NETDEV_UNREGISTER)
2979                 vxlan_handle_lowerdev_unregister(vn, dev);
2980
2981         return NOTIFY_DONE;
2982 }
2983
2984 static struct notifier_block vxlan_notifier_block __read_mostly = {
2985         .notifier_call = vxlan_lowerdev_event,
2986 };
2987
2988 static __net_init int vxlan_init_net(struct net *net)
2989 {
2990         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2991         unsigned int h;
2992
2993         INIT_LIST_HEAD(&vn->vxlan_list);
2994         spin_lock_init(&vn->sock_lock);
2995
2996         for (h = 0; h < PORT_HASH_SIZE; ++h)
2997                 INIT_HLIST_HEAD(&vn->sock_list[h]);
2998
2999         return 0;
3000 }
3001
3002 static void __net_exit vxlan_exit_net(struct net *net)
3003 {
3004         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3005         struct vxlan_dev *vxlan, *next;
3006         struct net_device *dev, *aux;
3007         LIST_HEAD(list);
3008
3009         rtnl_lock();
3010         for_each_netdev_safe(net, dev, aux)
3011                 if (dev->rtnl_link_ops == &vxlan_link_ops)
3012                         unregister_netdevice_queue(dev, &list);
3013
3014         list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3015                 /* If vxlan->dev is in the same netns, it has already been added
3016                  * to the list by the previous loop.
3017                  */
3018                 if (!net_eq(dev_net(vxlan->dev), net))
3019                         unregister_netdevice_queue(dev, &list);
3020         }
3021
3022         unregister_netdevice_many(&list);
3023         rtnl_unlock();
3024 }
3025
3026 static struct pernet_operations vxlan_net_ops = {
3027         .init = vxlan_init_net,
3028         .exit = vxlan_exit_net,
3029         .id   = &vxlan_net_id,
3030         .size = sizeof(struct vxlan_net),
3031 };
3032
3033 static int __init vxlan_init_module(void)
3034 {
3035         int rc;
3036
3037         vxlan_wq = alloc_workqueue("vxlan", 0, 0);
3038         if (!vxlan_wq)
3039                 return -ENOMEM;
3040
3041         get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
3042
3043         rc = register_pernet_subsys(&vxlan_net_ops);
3044         if (rc)
3045                 goto out1;
3046
3047         rc = register_netdevice_notifier(&vxlan_notifier_block);
3048         if (rc)
3049                 goto out2;
3050
3051         rc = rtnl_link_register(&vxlan_link_ops);
3052         if (rc)
3053                 goto out3;
3054
3055         return 0;
3056 out3:
3057         unregister_netdevice_notifier(&vxlan_notifier_block);
3058 out2:
3059         unregister_pernet_subsys(&vxlan_net_ops);
3060 out1:
3061         destroy_workqueue(vxlan_wq);
3062         return rc;
3063 }
3064 late_initcall(vxlan_init_module);
3065
3066 static void __exit vxlan_cleanup_module(void)
3067 {
3068         rtnl_link_unregister(&vxlan_link_ops);
3069         unregister_netdevice_notifier(&vxlan_notifier_block);
3070         destroy_workqueue(vxlan_wq);
3071         unregister_pernet_subsys(&vxlan_net_ops);
3072         /* rcu_barrier() is called by netns */
3073 }
3074 module_exit(vxlan_cleanup_module);
3075
3076 MODULE_LICENSE("GPL");
3077 MODULE_VERSION(VXLAN_VERSION);
3078 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
3079 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
3080 MODULE_ALIAS_RTNL_LINK("vxlan");