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_LINK_NETNSID,
 345                         peernet2id(dev_net(vxlan->dev), vxlan->net)))
 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(__s32)) /* NDA_LINK_NETNSID */
 389                 + nla_total_size(sizeof(struct nda_cacheinfo));
 390 }
 391
 392 static void vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
 393                              struct vxlan_rdst *rd, int type)
 394 {
 395         struct net *net = dev_net(vxlan->dev);
 396         struct sk_buff *skb;
 397         int err = -ENOBUFS;
 398
 399         skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
 400         if (skb == NULL)
 401                 goto errout;
 402
 403         err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
 404         if (err < 0) {
 405                 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
 406                 WARN_ON(err == -EMSGSIZE);
 407                 kfree_skb(skb);
 408                 goto errout;
 409         }
 410
 411         rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
 412         return;
 413 errout:
 414         if (err < 0)
 415                 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
 416 }
 417
 418 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
 419 {
 420         struct vxlan_dev *vxlan = netdev_priv(dev);
 421         struct vxlan_fdb f = {
 422                 .state = NUD_STALE,
 423         };
 424         struct vxlan_rdst remote = {
 425                 .remote_ip = *ipa, /* goes to NDA_DST */
 426                 .remote_vni = VXLAN_N_VID,
 427         };
 428
 429         vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
 430 }
 431
 432 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
 433 {
 434         struct vxlan_fdb f = {
 435                 .state = NUD_STALE,
 436         };
 437         struct vxlan_rdst remote = { };
 438
 439         memcpy(f.eth_addr, eth_addr, ETH_ALEN);
 440
 441         vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
 442 }
 443
 444 /* Hash Ethernet address */
 445 static u32 eth_hash(const unsigned char *addr)
 446 {
 447         u64 value = get_unaligned((u64 *)addr);
 448
 449         /* only want 6 bytes */
 450 #ifdef __BIG_ENDIAN
 451         value >>= 16;
 452 #else
 453         value <<= 16;
 454 #endif
 455         return hash_64(value, FDB_HASH_BITS);
 456 }
 457
 458 /* Hash chain to use given mac address */
 459 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
 460                                                 const u8 *mac)
 461 {
 462         return &vxlan->fdb_head[eth_hash(mac)];
 463 }
 464
 465 /* Look up Ethernet address in forwarding table */
 466 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
 467                                         const u8 *mac)
 468 {
 469         struct hlist_head *head = vxlan_fdb_head(vxlan, mac);
 470         struct vxlan_fdb *f;
 471
 472         hlist_for_each_entry_rcu(f, head, hlist) {
 473                 if (ether_addr_equal(mac, f->eth_addr))
 474                         return f;
 475         }
 476
 477         return NULL;
 478 }
 479
 480 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
 481                                         const u8 *mac)
 482 {
 483         struct vxlan_fdb *f;
 484
 485         f = __vxlan_find_mac(vxlan, mac);
 486         if (f)
 487                 f->used = jiffies;
 488
 489         return f;
 490 }
 491
 492 /* caller should hold vxlan->hash_lock */
 493 static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
 494                                               union vxlan_addr *ip, __be16 port,
 495                                               __u32 vni, __u32 ifindex)
 496 {
 497         struct vxlan_rdst *rd;
 498
 499         list_for_each_entry(rd, &f->remotes, list) {
 500                 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
 501                     rd->remote_port == port &&
 502                     rd->remote_vni == vni &&
 503                     rd->remote_ifindex == ifindex)
 504                         return rd;
 505         }
 506
 507         return NULL;
 508 }
 509
 510 /* Replace destination of unicast mac */
 511 static int vxlan_fdb_replace(struct vxlan_fdb *f,
 512                              union vxlan_addr *ip, __be16 port, __u32 vni, __u32 ifindex)
 513 {
 514         struct vxlan_rdst *rd;
 515
 516         rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
 517         if (rd)
 518                 return 0;
 519
 520         rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
 521         if (!rd)
 522                 return 0;
 523         rd->remote_ip = *ip;
 524         rd->remote_port = port;
 525         rd->remote_vni = vni;
 526         rd->remote_ifindex = ifindex;
 527         return 1;
 528 }
 529
 530 /* Add/update destinations for multicast */
 531 static int vxlan_fdb_append(struct vxlan_fdb *f,
 532                             union vxlan_addr *ip, __be16 port, __u32 vni,
 533                             __u32 ifindex, struct vxlan_rdst **rdp)
 534 {
 535         struct vxlan_rdst *rd;
 536
 537         rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
 538         if (rd)
 539                 return 0;
 540
 541         rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
 542         if (rd == NULL)
 543                 return -ENOBUFS;
 544         rd->remote_ip = *ip;
 545         rd->remote_port = port;
 546         rd->remote_vni = vni;
 547         rd->remote_ifindex = ifindex;
 548
 549         list_add_tail_rcu(&rd->list, &f->remotes);
 550
 551         *rdp = rd;
 552         return 1;
 553 }
 554
 555 static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
 556                                           unsigned int off,
 557                                           struct vxlanhdr *vh, size_t hdrlen,
 558                                           u32 data)
 559 {
 560         size_t start, offset, plen;
 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         skb_gro_remcsum_process(skb, (void *)vh + hdrlen, start, offset);
 583
 584         skb->remcsum_offload = 1;
 585
 586         return vh;
 587 }
 588
 589 static struct sk_buff **vxlan_gro_receive(struct sk_buff **head,
 590                                           struct sk_buff *skb,
 591                                           struct udp_offload *uoff)
 592 {
 593         struct sk_buff *p, **pp = NULL;
 594         struct vxlanhdr *vh, *vh2;
 595         unsigned int hlen, off_vx;
 596         int flush = 1;
 597         struct vxlan_sock *vs = container_of(uoff, struct vxlan_sock,
 598                                              udp_offloads);
 599         u32 flags;
 600
 601         off_vx = skb_gro_offset(skb);
 602         hlen = off_vx + sizeof(*vh);
 603         vh   = skb_gro_header_fast(skb, off_vx);
 604         if (skb_gro_header_hard(skb, hlen)) {
 605                 vh = skb_gro_header_slow(skb, hlen, off_vx);
 606                 if (unlikely(!vh))
 607                         goto out;
 608         }
 609
 610         skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
 611         skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
 612
 613         flags = ntohl(vh->vx_flags);
 614
 615         if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
 616                 vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
 617                                        ntohl(vh->vx_vni));
 618
 619                 if (!vh)
 620                         goto out;
 621         }
 622
 623         flush = 0;
 624
 625         for (p = *head; p; p = p->next) {
 626                 if (!NAPI_GRO_CB(p)->same_flow)
 627                         continue;
 628
 629                 vh2 = (struct vxlanhdr *)(p->data + off_vx);
 630                 if (vh->vx_flags != vh2->vx_flags ||
 631                     vh->vx_vni != vh2->vx_vni) {
 632                         NAPI_GRO_CB(p)->same_flow = 0;
 633                         continue;
 634                 }
 635         }
 636
 637         pp = eth_gro_receive(head, skb);
 638
 639 out:
 640         NAPI_GRO_CB(skb)->flush |= flush;
 641
 642         return pp;
 643 }
 644
 645 static int vxlan_gro_complete(struct sk_buff *skb, int nhoff,
 646                               struct udp_offload *uoff)
 647 {
 648         udp_tunnel_gro_complete(skb, nhoff);
 649
 650         return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
 651 }
 652
 653 /* Notify netdevs that UDP port started listening */
 654 static void vxlan_notify_add_rx_port(struct vxlan_sock *vs)
 655 {
 656         struct net_device *dev;
 657         struct sock *sk = vs->sock->sk;
 658         struct net *net = sock_net(sk);
 659         sa_family_t sa_family = sk->sk_family;
 660         __be16 port = inet_sk(sk)->inet_sport;
 661         int err;
 662
 663         if (sa_family == AF_INET) {
 664                 err = udp_add_offload(&vs->udp_offloads);
 665                 if (err)
 666                         pr_warn("vxlan: udp_add_offload failed with status %d\n", err);
 667         }
 668
 669         rcu_read_lock();
 670         for_each_netdev_rcu(net, dev) {
 671                 if (dev->netdev_ops->ndo_add_vxlan_port)
 672                         dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
 673                                                             port);
 674         }
 675         rcu_read_unlock();
 676 }
 677
 678 /* Notify netdevs that UDP port is no more listening */
 679 static void vxlan_notify_del_rx_port(struct vxlan_sock *vs)
 680 {
 681         struct net_device *dev;
 682         struct sock *sk = vs->sock->sk;
 683         struct net *net = sock_net(sk);
 684         sa_family_t sa_family = sk->sk_family;
 685         __be16 port = inet_sk(sk)->inet_sport;
 686
 687         rcu_read_lock();
 688         for_each_netdev_rcu(net, dev) {
 689                 if (dev->netdev_ops->ndo_del_vxlan_port)
 690                         dev->netdev_ops->ndo_del_vxlan_port(dev, sa_family,
 691                                                             port);
 692         }
 693         rcu_read_unlock();
 694
 695         if (sa_family == AF_INET)
 696                 udp_del_offload(&vs->udp_offloads);
 697 }
 698
 699 /* Add new entry to forwarding table -- assumes lock held */
 700 static int vxlan_fdb_create(struct vxlan_dev *vxlan,
 701                             const u8 *mac, union vxlan_addr *ip,
 702                             __u16 state, __u16 flags,
 703                             __be16 port, __u32 vni, __u32 ifindex,
 704                             __u8 ndm_flags)
 705 {
 706         struct vxlan_rdst *rd = NULL;
 707         struct vxlan_fdb *f;
 708         int notify = 0;
 709
 710         f = __vxlan_find_mac(vxlan, mac);
 711         if (f) {
 712                 if (flags & NLM_F_EXCL) {
 713                         netdev_dbg(vxlan->dev,
 714                                    "lost race to create %pM\n", mac);
 715                         return -EEXIST;
 716                 }
 717                 if (f->state != state) {
 718                         f->state = state;
 719                         f->updated = jiffies;
 720                         notify = 1;
 721                 }
 722                 if (f->flags != ndm_flags) {
 723                         f->flags = ndm_flags;
 724                         f->updated = jiffies;
 725                         notify = 1;
 726                 }
 727                 if ((flags & NLM_F_REPLACE)) {
 728                         /* Only change unicasts */
 729                         if (!(is_multicast_ether_addr(f->eth_addr) ||
 730                              is_zero_ether_addr(f->eth_addr))) {
 731                                 int rc = vxlan_fdb_replace(f, ip, port, vni,
 732                                                            ifindex);
 733
 734                                 if (rc < 0)
 735                                         return rc;
 736                                 notify |= rc;
 737                         } else
 738                                 return -EOPNOTSUPP;
 739                 }
 740                 if ((flags & NLM_F_APPEND) &&
 741                     (is_multicast_ether_addr(f->eth_addr) ||
 742                      is_zero_ether_addr(f->eth_addr))) {
 743                         int rc = vxlan_fdb_append(f, ip, port, vni, ifindex,
 744                                                   &rd);
 745
 746                         if (rc < 0)
 747                                 return rc;
 748                         notify |= rc;
 749                 }
 750         } else {
 751                 if (!(flags & NLM_F_CREATE))
 752                         return -ENOENT;
 753
 754                 if (vxlan->addrmax && vxlan->addrcnt >= vxlan->addrmax)
 755                         return -ENOSPC;
 756
 757                 /* Disallow replace to add a multicast entry */
 758                 if ((flags & NLM_F_REPLACE) &&
 759                     (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
 760                         return -EOPNOTSUPP;
 761
 762                 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
 763                 f = kmalloc(sizeof(*f), GFP_ATOMIC);
 764                 if (!f)
 765                         return -ENOMEM;
 766
 767                 notify = 1;
 768                 f->state = state;
 769                 f->flags = ndm_flags;
 770                 f->updated = f->used = jiffies;
 771                 INIT_LIST_HEAD(&f->remotes);
 772                 memcpy(f->eth_addr, mac, ETH_ALEN);
 773
 774                 vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
 775
 776                 ++vxlan->addrcnt;
 777                 hlist_add_head_rcu(&f->hlist,
 778                                    vxlan_fdb_head(vxlan, mac));
 779         }
 780
 781         if (notify) {
 782                 if (rd == NULL)
 783                         rd = first_remote_rtnl(f);
 784                 vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH);
 785         }
 786
 787         return 0;
 788 }
 789
 790 static void vxlan_fdb_free(struct rcu_head *head)
 791 {
 792         struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
 793         struct vxlan_rdst *rd, *nd;
 794
 795         list_for_each_entry_safe(rd, nd, &f->remotes, list)
 796                 kfree(rd);
 797         kfree(f);
 798 }
 799
 800 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f)
 801 {
 802         netdev_dbg(vxlan->dev,
 803                     "delete %pM\n", f->eth_addr);
 804
 805         --vxlan->addrcnt;
 806         vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_DELNEIGH);
 807
 808         hlist_del_rcu(&f->hlist);
 809         call_rcu(&f->rcu, vxlan_fdb_free);
 810 }
 811
 812 static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
 813                            union vxlan_addr *ip, __be16 *port, u32 *vni, u32 *ifindex)
 814 {
 815         struct net *net = dev_net(vxlan->dev);
 816         int err;
 817
 818         if (tb[NDA_DST]) {
 819                 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
 820                 if (err)
 821                         return err;
 822         } else {
 823                 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
 824                 if (remote->sa.sa_family == AF_INET) {
 825                         ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
 826                         ip->sa.sa_family = AF_INET;
 827 #if IS_ENABLED(CONFIG_IPV6)
 828                 } else {
 829                         ip->sin6.sin6_addr = in6addr_any;
 830                         ip->sa.sa_family = AF_INET6;
 831 #endif
 832                 }
 833         }
 834
 835         if (tb[NDA_PORT]) {
 836                 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
 837                         return -EINVAL;
 838                 *port = nla_get_be16(tb[NDA_PORT]);
 839         } else {
 840                 *port = vxlan->dst_port;
 841         }
 842
 843         if (tb[NDA_VNI]) {
 844                 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
 845                         return -EINVAL;
 846                 *vni = nla_get_u32(tb[NDA_VNI]);
 847         } else {
 848                 *vni = vxlan->default_dst.remote_vni;
 849         }
 850
 851         if (tb[NDA_IFINDEX]) {
 852                 struct net_device *tdev;
 853
 854                 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
 855                         return -EINVAL;
 856                 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
 857                 tdev = __dev_get_by_index(net, *ifindex);
 858                 if (!tdev)
 859                         return -EADDRNOTAVAIL;
 860         } else {
 861                 *ifindex = 0;
 862         }
 863
 864         return 0;
 865 }
 866
 867 /* Add static entry (via netlink) */
 868 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
 869                          struct net_device *dev,
 870                          const unsigned char *addr, u16 vid, u16 flags)
 871 {
 872         struct vxlan_dev *vxlan = netdev_priv(dev);
 873         /* struct net *net = dev_net(vxlan->dev); */
 874         union vxlan_addr ip;
 875         __be16 port;
 876         u32 vni, ifindex;
 877         int err;
 878
 879         if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
 880                 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
 881                         ndm->ndm_state);
 882                 return -EINVAL;
 883         }
 884
 885         if (tb[NDA_DST] == NULL)
 886                 return -EINVAL;
 887
 888         err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
 889         if (err)
 890                 return err;
 891
 892         if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
 893                 return -EAFNOSUPPORT;
 894
 895         spin_lock_bh(&vxlan->hash_lock);
 896         err = vxlan_fdb_create(vxlan, addr, &ip, ndm->ndm_state, flags,
 897                                port, vni, ifindex, ndm->ndm_flags);
 898         spin_unlock_bh(&vxlan->hash_lock);
 899
 900         return err;
 901 }
 902
 903 /* Delete entry (via netlink) */
 904 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
 905                             struct net_device *dev,
 906                             const unsigned char *addr, u16 vid)
 907 {
 908         struct vxlan_dev *vxlan = netdev_priv(dev);
 909         struct vxlan_fdb *f;
 910         struct vxlan_rdst *rd = NULL;
 911         union vxlan_addr ip;
 912         __be16 port;
 913         u32 vni, ifindex;
 914         int err;
 915
 916         err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
 917         if (err)
 918                 return err;
 919
 920         err = -ENOENT;
 921
 922         spin_lock_bh(&vxlan->hash_lock);
 923         f = vxlan_find_mac(vxlan, addr);
 924         if (!f)
 925                 goto out;
 926
 927         if (!vxlan_addr_any(&ip)) {
 928                 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
 929                 if (!rd)
 930                         goto out;
 931         }
 932
 933         err = 0;
 934
 935         /* remove a destination if it's not the only one on the list,
 936          * otherwise destroy the fdb entry
 937          */
 938         if (rd && !list_is_singular(&f->remotes)) {
 939                 list_del_rcu(&rd->list);
 940                 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH);
 941                 kfree_rcu(rd, rcu);
 942                 goto out;
 943         }
 944
 945         vxlan_fdb_destroy(vxlan, f);
 946
 947 out:
 948         spin_unlock_bh(&vxlan->hash_lock);
 949
 950         return err;
 951 }
 952
 953 /* Dump forwarding table */
 954 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
 955                           struct net_device *dev,
 956                           struct net_device *filter_dev, int idx)
 957 {
 958         struct vxlan_dev *vxlan = netdev_priv(dev);
 959         unsigned int h;
 960
 961         for (h = 0; h < FDB_HASH_SIZE; ++h) {
 962                 struct vxlan_fdb *f;
 963                 int err;
 964
 965                 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
 966                         struct vxlan_rdst *rd;
 967
 968                         if (idx < cb->args[0])
 969                                 goto skip;
 970
 971                         list_for_each_entry_rcu(rd, &f->remotes, list) {
 972                                 err = vxlan_fdb_info(skb, vxlan, f,
 973                                                      NETLINK_CB(cb->skb).portid,
 974                                                      cb->nlh->nlmsg_seq,
 975                                                      RTM_NEWNEIGH,
 976                                                      NLM_F_MULTI, rd);
 977                                 if (err < 0)
 978                                         goto out;
 979                         }
 980 skip:
 981                         ++idx;
 982                 }
 983         }
 984 out:
 985         return idx;
 986 }
 987
 988 /* Watch incoming packets to learn mapping between Ethernet address
 989  * and Tunnel endpoint.
 990  * Return true if packet is bogus and should be droppped.
 991  */
 992 static bool vxlan_snoop(struct net_device *dev,
 993                         union vxlan_addr *src_ip, const u8 *src_mac)
 994 {
 995         struct vxlan_dev *vxlan = netdev_priv(dev);
 996         struct vxlan_fdb *f;
 997
 998         f = vxlan_find_mac(vxlan, src_mac);
 999         if (likely(f)) {
1000                 struct vxlan_rdst *rdst = first_remote_rcu(f);
1001
1002                 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip)))
1003                         return false;
1004
1005                 /* Don't migrate static entries, drop packets */
1006                 if (f->state & NUD_NOARP)
1007                         return true;
1008
1009                 if (net_ratelimit())
1010                         netdev_info(dev,
1011                                     "%pM migrated from %pIS to %pIS\n",
1012                                     src_mac, &rdst->remote_ip, &src_ip);
1013
1014                 rdst->remote_ip = *src_ip;
1015                 f->updated = jiffies;
1016                 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH);
1017         } else {
1018                 /* learned new entry */
1019                 spin_lock(&vxlan->hash_lock);
1020
1021                 /* close off race between vxlan_flush and incoming packets */
1022                 if (netif_running(dev))
1023                         vxlan_fdb_create(vxlan, src_mac, src_ip,
1024                                          NUD_REACHABLE,
1025                                          NLM_F_EXCL|NLM_F_CREATE,
1026                                          vxlan->dst_port,
1027                                          vxlan->default_dst.remote_vni,
1028                                          0, NTF_SELF);
1029                 spin_unlock(&vxlan->hash_lock);
1030         }
1031
1032         return false;
1033 }
1034
1035 /* See if multicast group is already in use by other ID */
1036 static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
1037 {
1038         struct vxlan_dev *vxlan;
1039
1040         /* The vxlan_sock is only used by dev, leaving group has
1041          * no effect on other vxlan devices.
1042          */
1043         if (atomic_read(&dev->vn_sock->refcnt) == 1)
1044                 return false;
1045
1046         list_for_each_entry(vxlan, &vn->vxlan_list, next) {
1047                 if (!netif_running(vxlan->dev) || vxlan == dev)
1048                         continue;
1049
1050                 if (vxlan->vn_sock != dev->vn_sock)
1051                         continue;
1052
1053                 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
1054                                       &dev->default_dst.remote_ip))
1055                         continue;
1056
1057                 if (vxlan->default_dst.remote_ifindex !=
1058                     dev->default_dst.remote_ifindex)
1059                         continue;
1060
1061                 return true;
1062         }
1063
1064         return false;
1065 }
1066
1067 static void vxlan_sock_hold(struct vxlan_sock *vs)
1068 {
1069         atomic_inc(&vs->refcnt);
1070 }
1071
1072 void vxlan_sock_release(struct vxlan_sock *vs)
1073 {
1074         struct sock *sk = vs->sock->sk;
1075         struct net *net = sock_net(sk);
1076         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
1077
1078         if (!atomic_dec_and_test(&vs->refcnt))
1079                 return;
1080
1081         spin_lock(&vn->sock_lock);
1082         hlist_del_rcu(&vs->hlist);
1083         vxlan_notify_del_rx_port(vs);
1084         spin_unlock(&vn->sock_lock);
1085
1086         queue_work(vxlan_wq, &vs->del_work);
1087 }
1088 EXPORT_SYMBOL_GPL(vxlan_sock_release);
1089
1090 /* Callback to update multicast group membership when first VNI on
1091  * multicast asddress is brought up
1092  * Done as workqueue because ip_mc_join_group acquires RTNL.
1093  */
1094 static void vxlan_igmp_join(struct work_struct *work)
1095 {
1096         struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, igmp_join);
1097         struct vxlan_sock *vs = vxlan->vn_sock;
1098         struct sock *sk = vs->sock->sk;
1099         union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1100         int ifindex = vxlan->default_dst.remote_ifindex;
1101
1102         lock_sock(sk);
1103         if (ip->sa.sa_family == AF_INET) {
1104                 struct ip_mreqn mreq = {
1105                         .imr_multiaddr.s_addr   = ip->sin.sin_addr.s_addr,
1106                         .imr_ifindex            = ifindex,
1107                 };
1108
1109                 ip_mc_join_group(sk, &mreq);
1110 #if IS_ENABLED(CONFIG_IPV6)
1111         } else {
1112                 ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1113                                              &ip->sin6.sin6_addr);
1114 #endif
1115         }
1116         release_sock(sk);
1117
1118         vxlan_sock_release(vs);
1119         dev_put(vxlan->dev);
1120 }
1121
1122 /* Inverse of vxlan_igmp_join when last VNI is brought down */
1123 static void vxlan_igmp_leave(struct work_struct *work)
1124 {
1125         struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, igmp_leave);
1126         struct vxlan_sock *vs = vxlan->vn_sock;
1127         struct sock *sk = vs->sock->sk;
1128         union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1129         int ifindex = vxlan->default_dst.remote_ifindex;
1130
1131         lock_sock(sk);
1132         if (ip->sa.sa_family == AF_INET) {
1133                 struct ip_mreqn mreq = {
1134                         .imr_multiaddr.s_addr   = ip->sin.sin_addr.s_addr,
1135                         .imr_ifindex            = ifindex,
1136                 };
1137
1138                 ip_mc_leave_group(sk, &mreq);
1139 #if IS_ENABLED(CONFIG_IPV6)
1140         } else {
1141                 ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1142                                              &ip->sin6.sin6_addr);
1143 #endif
1144         }
1145
1146         release_sock(sk);
1147
1148         vxlan_sock_release(vs);
1149         dev_put(vxlan->dev);
1150 }
1151
1152 static struct vxlanhdr *vxlan_remcsum(struct sk_buff *skb, struct vxlanhdr *vh,
1153                                       size_t hdrlen, u32 data)
1154 {
1155         size_t start, offset, plen;
1156
1157         if (skb->remcsum_offload) {
1158                 /* Already processed in GRO path */
1159                 skb->remcsum_offload = 0;
1160                 return vh;
1161         }
1162
1163         start = (data & VXLAN_RCO_MASK) << VXLAN_RCO_SHIFT;
1164         offset = start + ((data & VXLAN_RCO_UDP) ?
1165                           offsetof(struct udphdr, check) :
1166                           offsetof(struct tcphdr, check));
1167
1168         plen = hdrlen + offset + sizeof(u16);
1169
1170         if (!pskb_may_pull(skb, plen))
1171                 return NULL;
1172
1173         vh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1174
1175         skb_remcsum_process(skb, (void *)vh + hdrlen, start, offset);
1176
1177         return vh;
1178 }
1179
1180 /* Callback from net/ipv4/udp.c to receive packets */
1181 static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
1182 {
1183         struct vxlan_sock *vs;
1184         struct vxlanhdr *vxh;
1185         u32 flags, vni;
1186         struct vxlan_metadata md = {0};
1187
1188         /* Need Vxlan and inner Ethernet header to be present */
1189         if (!pskb_may_pull(skb, VXLAN_HLEN))
1190                 goto error;
1191
1192         vxh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1193         flags = ntohl(vxh->vx_flags);
1194         vni = ntohl(vxh->vx_vni);
1195
1196         if (flags & VXLAN_HF_VNI) {
1197                 flags &= ~VXLAN_HF_VNI;
1198         } else {
1199                 /* VNI flag always required to be set */
1200                 goto bad_flags;
1201         }
1202
1203         if (iptunnel_pull_header(skb, VXLAN_HLEN, htons(ETH_P_TEB)))
1204                 goto drop;
1205         vxh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1206
1207         vs = rcu_dereference_sk_user_data(sk);
1208         if (!vs)
1209                 goto drop;
1210
1211         if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
1212                 vxh = vxlan_remcsum(skb, vxh, sizeof(struct vxlanhdr), vni);
1213                 if (!vxh)
1214                         goto drop;
1215
1216                 flags &= ~VXLAN_HF_RCO;
1217                 vni &= VXLAN_VID_MASK;
1218         }
1219
1220         /* For backwards compatibility, only allow reserved fields to be
1221          * used by VXLAN extensions if explicitly requested.
1222          */
1223         if ((flags & VXLAN_HF_GBP) && (vs->flags & VXLAN_F_GBP)) {
1224                 struct vxlanhdr_gbp *gbp;
1225
1226                 gbp = (struct vxlanhdr_gbp *)vxh;
1227                 md.gbp = ntohs(gbp->policy_id);
1228
1229                 if (gbp->dont_learn)
1230                         md.gbp |= VXLAN_GBP_DONT_LEARN;
1231
1232                 if (gbp->policy_applied)
1233                         md.gbp |= VXLAN_GBP_POLICY_APPLIED;
1234
1235                 flags &= ~VXLAN_GBP_USED_BITS;
1236         }
1237
1238         if (flags || (vni & ~VXLAN_VID_MASK)) {
1239                 /* If there are any unprocessed flags remaining treat
1240                  * this as a malformed packet. This behavior diverges from
1241                  * VXLAN RFC (RFC7348) which stipulates that bits in reserved
1242                  * in reserved fields are to be ignored. The approach here
1243                  * maintains compatbility with previous stack code, and also
1244                  * is more robust and provides a little more security in
1245                  * adding extensions to VXLAN.
1246                  */
1247
1248                 goto bad_flags;
1249         }
1250
1251         md.vni = vxh->vx_vni;
1252         vs->rcv(vs, skb, &md);
1253         return 0;
1254
1255 drop:
1256         /* Consume bad packet */
1257         kfree_skb(skb);
1258         return 0;
1259
1260 bad_flags:
1261         netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1262                    ntohl(vxh->vx_flags), ntohl(vxh->vx_vni));
1263
1264 error:
1265         /* Return non vxlan pkt */
1266         return 1;
1267 }
1268
1269 static void vxlan_rcv(struct vxlan_sock *vs, struct sk_buff *skb,
1270                       struct vxlan_metadata *md)
1271 {
1272         struct iphdr *oip = NULL;
1273         struct ipv6hdr *oip6 = NULL;
1274         struct vxlan_dev *vxlan;
1275         struct pcpu_sw_netstats *stats;
1276         union vxlan_addr saddr;
1277         __u32 vni;
1278         int err = 0;
1279         union vxlan_addr *remote_ip;
1280
1281         vni = ntohl(md->vni) >> 8;
1282         /* Is this VNI defined? */
1283         vxlan = vxlan_vs_find_vni(vs, vni);
1284         if (!vxlan)
1285                 goto drop;
1286
1287         remote_ip = &vxlan->default_dst.remote_ip;
1288         skb_reset_mac_header(skb);
1289         skb_scrub_packet(skb, !net_eq(vxlan->net, dev_net(vxlan->dev)));
1290         skb->protocol = eth_type_trans(skb, vxlan->dev);
1291         skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1292
1293         /* Ignore packet loops (and multicast echo) */
1294         if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1295                 goto drop;
1296
1297         /* Re-examine inner Ethernet packet */
1298         if (remote_ip->sa.sa_family == AF_INET) {
1299                 oip = ip_hdr(skb);
1300                 saddr.sin.sin_addr.s_addr = oip->saddr;
1301                 saddr.sa.sa_family = AF_INET;
1302 #if IS_ENABLED(CONFIG_IPV6)
1303         } else {
1304                 oip6 = ipv6_hdr(skb);
1305                 saddr.sin6.sin6_addr = oip6->saddr;
1306                 saddr.sa.sa_family = AF_INET6;
1307 #endif
1308         }
1309
1310         if ((vxlan->flags & VXLAN_F_LEARN) &&
1311             vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source))
1312                 goto drop;
1313
1314         skb_reset_network_header(skb);
1315         skb->mark = md->gbp;
1316
1317         if (oip6)
1318                 err = IP6_ECN_decapsulate(oip6, skb);
1319         if (oip)
1320                 err = IP_ECN_decapsulate(oip, skb);
1321
1322         if (unlikely(err)) {
1323                 if (log_ecn_error) {
1324                         if (oip6)
1325                                 net_info_ratelimited("non-ECT from %pI6\n",
1326                                                      &oip6->saddr);
1327                         if (oip)
1328                                 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1329                                                      &oip->saddr, oip->tos);
1330                 }
1331                 if (err > 1) {
1332                         ++vxlan->dev->stats.rx_frame_errors;
1333                         ++vxlan->dev->stats.rx_errors;
1334                         goto drop;
1335                 }
1336         }
1337
1338         stats = this_cpu_ptr(vxlan->dev->tstats);
1339         u64_stats_update_begin(&stats->syncp);
1340         stats->rx_packets++;
1341         stats->rx_bytes += skb->len;
1342         u64_stats_update_end(&stats->syncp);
1343
1344         netif_rx(skb);
1345
1346         return;
1347 drop:
1348         /* Consume bad packet */
1349         kfree_skb(skb);
1350 }
1351
1352 static int arp_reduce(struct net_device *dev, struct sk_buff *skb)
1353 {
1354         struct vxlan_dev *vxlan = netdev_priv(dev);
1355         struct arphdr *parp;
1356         u8 *arpptr, *sha;
1357         __be32 sip, tip;
1358         struct neighbour *n;
1359
1360         if (dev->flags & IFF_NOARP)
1361                 goto out;
1362
1363         if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1364                 dev->stats.tx_dropped++;
1365                 goto out;
1366         }
1367         parp = arp_hdr(skb);
1368
1369         if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1370              parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1371             parp->ar_pro != htons(ETH_P_IP) ||
1372             parp->ar_op != htons(ARPOP_REQUEST) ||
1373             parp->ar_hln != dev->addr_len ||
1374             parp->ar_pln != 4)
1375                 goto out;
1376         arpptr = (u8 *)parp + sizeof(struct arphdr);
1377         sha = arpptr;
1378         arpptr += dev->addr_len;        /* sha */
1379         memcpy(&sip, arpptr, sizeof(sip));
1380         arpptr += sizeof(sip);
1381         arpptr += dev->addr_len;        /* tha */
1382         memcpy(&tip, arpptr, sizeof(tip));
1383
1384         if (ipv4_is_loopback(tip) ||
1385             ipv4_is_multicast(tip))
1386                 goto out;
1387
1388         n = neigh_lookup(&arp_tbl, &tip, dev);
1389
1390         if (n) {
1391                 struct vxlan_fdb *f;
1392                 struct sk_buff  *reply;
1393
1394                 if (!(n->nud_state & NUD_CONNECTED)) {
1395                         neigh_release(n);
1396                         goto out;
1397                 }
1398
1399                 f = vxlan_find_mac(vxlan, n->ha);
1400                 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1401                         /* bridge-local neighbor */
1402                         neigh_release(n);
1403                         goto out;
1404                 }
1405
1406                 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1407                                 n->ha, sha);
1408
1409                 neigh_release(n);
1410
1411                 if (reply == NULL)
1412                         goto out;
1413
1414                 skb_reset_mac_header(reply);
1415                 __skb_pull(reply, skb_network_offset(reply));
1416                 reply->ip_summed = CHECKSUM_UNNECESSARY;
1417                 reply->pkt_type = PACKET_HOST;
1418
1419                 if (netif_rx_ni(reply) == NET_RX_DROP)
1420                         dev->stats.rx_dropped++;
1421         } else if (vxlan->flags & VXLAN_F_L3MISS) {
1422                 union vxlan_addr ipa = {
1423                         .sin.sin_addr.s_addr = tip,
1424                         .sin.sin_family = AF_INET,
1425                 };
1426
1427                 vxlan_ip_miss(dev, &ipa);
1428         }
1429 out:
1430         consume_skb(skb);
1431         return NETDEV_TX_OK;
1432 }
1433
1434 #if IS_ENABLED(CONFIG_IPV6)
1435 static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1436         struct neighbour *n, bool isrouter)
1437 {
1438         struct net_device *dev = request->dev;
1439         struct sk_buff *reply;
1440         struct nd_msg *ns, *na;
1441         struct ipv6hdr *pip6;
1442         u8 *daddr;
1443         int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1444         int ns_olen;
1445         int i, len;
1446
1447         if (dev == NULL)
1448                 return NULL;
1449
1450         len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1451                 sizeof(*na) + na_olen + dev->needed_tailroom;
1452         reply = alloc_skb(len, GFP_ATOMIC);
1453         if (reply == NULL)
1454                 return NULL;
1455
1456         reply->protocol = htons(ETH_P_IPV6);
1457         reply->dev = dev;
1458         skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1459         skb_push(reply, sizeof(struct ethhdr));
1460         skb_set_mac_header(reply, 0);
1461
1462         ns = (struct nd_msg *)skb_transport_header(request);
1463
1464         daddr = eth_hdr(request)->h_source;
1465         ns_olen = request->len - skb_transport_offset(request) - sizeof(*ns);
1466         for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1467                 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1468                         daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1469                         break;
1470                 }
1471         }
1472
1473         /* Ethernet header */
1474         ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1475         ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1476         eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1477         reply->protocol = htons(ETH_P_IPV6);
1478
1479         skb_pull(reply, sizeof(struct ethhdr));
1480         skb_set_network_header(reply, 0);
1481         skb_put(reply, sizeof(struct ipv6hdr));
1482
1483         /* IPv6 header */
1484
1485         pip6 = ipv6_hdr(reply);
1486         memset(pip6, 0, sizeof(struct ipv6hdr));
1487         pip6->version = 6;
1488         pip6->priority = ipv6_hdr(request)->priority;
1489         pip6->nexthdr = IPPROTO_ICMPV6;
1490         pip6->hop_limit = 255;
1491         pip6->daddr = ipv6_hdr(request)->saddr;
1492         pip6->saddr = *(struct in6_addr *)n->primary_key;
1493
1494         skb_pull(reply, sizeof(struct ipv6hdr));
1495         skb_set_transport_header(reply, 0);
1496
1497         na = (struct nd_msg *)skb_put(reply, sizeof(*na) + na_olen);
1498
1499         /* Neighbor Advertisement */
1500         memset(na, 0, sizeof(*na)+na_olen);
1501         na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1502         na->icmph.icmp6_router = isrouter;
1503         na->icmph.icmp6_override = 1;
1504         na->icmph.icmp6_solicited = 1;
1505         na->target = ns->target;
1506         ether_addr_copy(&na->opt[2], n->ha);
1507         na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1508         na->opt[1] = na_olen >> 3;
1509
1510         na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1511                 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1512                 csum_partial(na, sizeof(*na)+na_olen, 0));
1513
1514         pip6->payload_len = htons(sizeof(*na)+na_olen);
1515
1516         skb_push(reply, sizeof(struct ipv6hdr));
1517
1518         reply->ip_summed = CHECKSUM_UNNECESSARY;
1519
1520         return reply;
1521 }
1522
1523 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb)
1524 {
1525         struct vxlan_dev *vxlan = netdev_priv(dev);
1526         struct nd_msg *msg;
1527         const struct ipv6hdr *iphdr;
1528         const struct in6_addr *saddr, *daddr;
1529         struct neighbour *n;
1530         struct inet6_dev *in6_dev;
1531
1532         in6_dev = __in6_dev_get(dev);
1533         if (!in6_dev)
1534                 goto out;
1535
1536         iphdr = ipv6_hdr(skb);
1537         saddr = &iphdr->saddr;
1538         daddr = &iphdr->daddr;
1539
1540         msg = (struct nd_msg *)skb_transport_header(skb);
1541         if (msg->icmph.icmp6_code != 0 ||
1542             msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION)
1543                 goto out;
1544
1545         if (ipv6_addr_loopback(daddr) ||
1546             ipv6_addr_is_multicast(&msg->target))
1547                 goto out;
1548
1549         n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
1550
1551         if (n) {
1552                 struct vxlan_fdb *f;
1553                 struct sk_buff *reply;
1554
1555                 if (!(n->nud_state & NUD_CONNECTED)) {
1556                         neigh_release(n);
1557                         goto out;
1558                 }
1559
1560                 f = vxlan_find_mac(vxlan, n->ha);
1561                 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1562                         /* bridge-local neighbor */
1563                         neigh_release(n);
1564                         goto out;
1565                 }
1566
1567                 reply = vxlan_na_create(skb, n,
1568                                         !!(f ? f->flags & NTF_ROUTER : 0));
1569
1570                 neigh_release(n);
1571
1572                 if (reply == NULL)
1573                         goto out;
1574
1575                 if (netif_rx_ni(reply) == NET_RX_DROP)
1576                         dev->stats.rx_dropped++;
1577
1578         } else if (vxlan->flags & VXLAN_F_L3MISS) {
1579                 union vxlan_addr ipa = {
1580                         .sin6.sin6_addr = msg->target,
1581                         .sin6.sin6_family = AF_INET6,
1582                 };
1583
1584                 vxlan_ip_miss(dev, &ipa);
1585         }
1586
1587 out:
1588         consume_skb(skb);
1589         return NETDEV_TX_OK;
1590 }
1591 #endif
1592
1593 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
1594 {
1595         struct vxlan_dev *vxlan = netdev_priv(dev);
1596         struct neighbour *n;
1597
1598         if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
1599                 return false;
1600
1601         n = NULL;
1602         switch (ntohs(eth_hdr(skb)->h_proto)) {
1603         case ETH_P_IP:
1604         {
1605                 struct iphdr *pip;
1606
1607                 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1608                         return false;
1609                 pip = ip_hdr(skb);
1610                 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
1611                 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1612                         union vxlan_addr ipa = {
1613                                 .sin.sin_addr.s_addr = pip->daddr,
1614                                 .sin.sin_family = AF_INET,
1615                         };
1616
1617                         vxlan_ip_miss(dev, &ipa);
1618                         return false;
1619                 }
1620
1621                 break;
1622         }
1623 #if IS_ENABLED(CONFIG_IPV6)
1624         case ETH_P_IPV6:
1625         {
1626                 struct ipv6hdr *pip6;
1627
1628                 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
1629                         return false;
1630                 pip6 = ipv6_hdr(skb);
1631                 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
1632                 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1633                         union vxlan_addr ipa = {
1634                                 .sin6.sin6_addr = pip6->daddr,
1635                                 .sin6.sin6_family = AF_INET6,
1636                         };
1637
1638                         vxlan_ip_miss(dev, &ipa);
1639                         return false;
1640                 }
1641
1642                 break;
1643         }
1644 #endif
1645         default:
1646                 return false;
1647         }
1648
1649         if (n) {
1650                 bool diff;
1651
1652                 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
1653                 if (diff) {
1654                         memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
1655                                 dev->addr_len);
1656                         memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
1657                 }
1658                 neigh_release(n);
1659                 return diff;
1660         }
1661
1662         return false;
1663 }
1664
1665 static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
1666                                 struct vxlan_metadata *md)
1667 {
1668         struct vxlanhdr_gbp *gbp;
1669
1670         if (!md->gbp)
1671                 return;
1672
1673         gbp = (struct vxlanhdr_gbp *)vxh;
1674         vxh->vx_flags |= htonl(VXLAN_HF_GBP);
1675
1676         if (md->gbp & VXLAN_GBP_DONT_LEARN)
1677                 gbp->dont_learn = 1;
1678
1679         if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
1680                 gbp->policy_applied = 1;
1681
1682         gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
1683 }
1684
1685 #if IS_ENABLED(CONFIG_IPV6)
1686 static int vxlan6_xmit_skb(struct dst_entry *dst, struct sk_buff *skb,
1687                            struct net_device *dev, struct in6_addr *saddr,
1688                            struct in6_addr *daddr, __u8 prio, __u8 ttl,
1689                            __be16 src_port, __be16 dst_port,
1690                            struct vxlan_metadata *md, bool xnet, u32 vxflags)
1691 {
1692         struct vxlanhdr *vxh;
1693         int min_headroom;
1694         int err;
1695         bool udp_sum = !(vxflags & VXLAN_F_UDP_ZERO_CSUM6_TX);
1696         int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1697         u16 hdrlen = sizeof(struct vxlanhdr);
1698
1699         if ((vxflags & VXLAN_F_REMCSUM_TX) &&
1700             skb->ip_summed == CHECKSUM_PARTIAL) {
1701                 int csum_start = skb_checksum_start_offset(skb);
1702
1703                 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1704                     !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1705                     (skb->csum_offset == offsetof(struct udphdr, check) ||
1706                      skb->csum_offset == offsetof(struct tcphdr, check))) {
1707                         udp_sum = false;
1708                         type |= SKB_GSO_TUNNEL_REMCSUM;
1709                 }
1710         }
1711
1712         skb = iptunnel_handle_offloads(skb, udp_sum, type);
1713         if (IS_ERR(skb)) {
1714                 err = -EINVAL;
1715                 goto err;
1716         }
1717
1718         skb_scrub_packet(skb, xnet);
1719
1720         min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
1721                         + VXLAN_HLEN + sizeof(struct ipv6hdr)
1722                         + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
1723
1724         /* Need space for new headers (invalidates iph ptr) */
1725         err = skb_cow_head(skb, min_headroom);
1726         if (unlikely(err)) {
1727                 kfree_skb(skb);
1728                 goto err;
1729         }
1730
1731         skb = vlan_hwaccel_push_inside(skb);
1732         if (WARN_ON(!skb)) {
1733                 err = -ENOMEM;
1734                 goto err;
1735         }
1736
1737         vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1738         vxh->vx_flags = htonl(VXLAN_HF_VNI);
1739         vxh->vx_vni = md->vni;
1740
1741         if (type & SKB_GSO_TUNNEL_REMCSUM) {
1742                 u32 data = (skb_checksum_start_offset(skb) - hdrlen) >>
1743                            VXLAN_RCO_SHIFT;
1744
1745                 if (skb->csum_offset == offsetof(struct udphdr, check))
1746                         data |= VXLAN_RCO_UDP;
1747
1748                 vxh->vx_vni |= htonl(data);
1749                 vxh->vx_flags |= htonl(VXLAN_HF_RCO);
1750
1751                 if (!skb_is_gso(skb)) {
1752                         skb->ip_summed = CHECKSUM_NONE;
1753                         skb->encapsulation = 0;
1754                 }
1755         }
1756
1757         if (vxflags & VXLAN_F_GBP)
1758                 vxlan_build_gbp_hdr(vxh, vxflags, md);
1759
1760         skb_set_inner_protocol(skb, htons(ETH_P_TEB));
1761
1762         udp_tunnel6_xmit_skb(dst, skb, dev, saddr, daddr, prio,
1763                              ttl, src_port, dst_port,
1764                              !!(vxflags & VXLAN_F_UDP_ZERO_CSUM6_TX));
1765         return 0;
1766 err:
1767         dst_release(dst);
1768         return err;
1769 }
1770 #endif
1771
1772 int vxlan_xmit_skb(struct rtable *rt, struct sk_buff *skb,
1773                    __be32 src, __be32 dst, __u8 tos, __u8 ttl, __be16 df,
1774                    __be16 src_port, __be16 dst_port,
1775                    struct vxlan_metadata *md, bool xnet, u32 vxflags)
1776 {
1777         struct vxlanhdr *vxh;
1778         int min_headroom;
1779         int err;
1780         bool udp_sum = !!(vxflags & VXLAN_F_UDP_CSUM);
1781         int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1782         u16 hdrlen = sizeof(struct vxlanhdr);
1783
1784         if ((vxflags & VXLAN_F_REMCSUM_TX) &&
1785             skb->ip_summed == CHECKSUM_PARTIAL) {
1786                 int csum_start = skb_checksum_start_offset(skb);
1787
1788                 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1789                     !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1790                     (skb->csum_offset == offsetof(struct udphdr, check) ||
1791                      skb->csum_offset == offsetof(struct tcphdr, check))) {
1792                         udp_sum = false;
1793                         type |= SKB_GSO_TUNNEL_REMCSUM;
1794                 }
1795         }
1796
1797         skb = iptunnel_handle_offloads(skb, udp_sum, type);
1798         if (IS_ERR(skb))
1799                 return PTR_ERR(skb);
1800
1801         min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
1802                         + VXLAN_HLEN + sizeof(struct iphdr)
1803                         + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
1804
1805         /* Need space for new headers (invalidates iph ptr) */
1806         err = skb_cow_head(skb, min_headroom);
1807         if (unlikely(err)) {
1808                 kfree_skb(skb);
1809                 return err;
1810         }
1811
1812         skb = vlan_hwaccel_push_inside(skb);
1813         if (WARN_ON(!skb))
1814                 return -ENOMEM;
1815
1816         vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1817         vxh->vx_flags = htonl(VXLAN_HF_VNI);
1818         vxh->vx_vni = md->vni;
1819
1820         if (type & SKB_GSO_TUNNEL_REMCSUM) {
1821                 u32 data = (skb_checksum_start_offset(skb) - hdrlen) >>
1822                            VXLAN_RCO_SHIFT;
1823
1824                 if (skb->csum_offset == offsetof(struct udphdr, check))
1825                         data |= VXLAN_RCO_UDP;
1826
1827                 vxh->vx_vni |= htonl(data);
1828                 vxh->vx_flags |= htonl(VXLAN_HF_RCO);
1829
1830                 if (!skb_is_gso(skb)) {
1831                         skb->ip_summed = CHECKSUM_NONE;
1832                         skb->encapsulation = 0;
1833                 }
1834         }
1835
1836         if (vxflags & VXLAN_F_GBP)
1837                 vxlan_build_gbp_hdr(vxh, vxflags, md);
1838
1839         skb_set_inner_protocol(skb, htons(ETH_P_TEB));
1840
1841         return udp_tunnel_xmit_skb(rt, skb, src, dst, tos,
1842                                    ttl, df, src_port, dst_port, xnet,
1843                                    !(vxflags & VXLAN_F_UDP_CSUM));
1844 }
1845 EXPORT_SYMBOL_GPL(vxlan_xmit_skb);
1846
1847 /* Bypass encapsulation if the destination is local */
1848 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
1849                                struct vxlan_dev *dst_vxlan)
1850 {
1851         struct pcpu_sw_netstats *tx_stats, *rx_stats;
1852         union vxlan_addr loopback;
1853         union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
1854         struct net_device *dev = skb->dev;
1855         int len = skb->len;
1856
1857         tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
1858         rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
1859         skb->pkt_type = PACKET_HOST;
1860         skb->encapsulation = 0;
1861         skb->dev = dst_vxlan->dev;
1862         __skb_pull(skb, skb_network_offset(skb));
1863
1864         if (remote_ip->sa.sa_family == AF_INET) {
1865                 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
1866                 loopback.sa.sa_family =  AF_INET;
1867 #if IS_ENABLED(CONFIG_IPV6)
1868         } else {
1869                 loopback.sin6.sin6_addr = in6addr_loopback;
1870                 loopback.sa.sa_family =  AF_INET6;
1871 #endif
1872         }
1873
1874         if (dst_vxlan->flags & VXLAN_F_LEARN)
1875                 vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source);
1876
1877         u64_stats_update_begin(&tx_stats->syncp);
1878         tx_stats->tx_packets++;
1879         tx_stats->tx_bytes += len;
1880         u64_stats_update_end(&tx_stats->syncp);
1881
1882         if (netif_rx(skb) == NET_RX_SUCCESS) {
1883                 u64_stats_update_begin(&rx_stats->syncp);
1884                 rx_stats->rx_packets++;
1885                 rx_stats->rx_bytes += len;
1886                 u64_stats_update_end(&rx_stats->syncp);
1887         } else {
1888                 dev->stats.rx_dropped++;
1889         }
1890 }
1891
1892 static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
1893                            struct vxlan_rdst *rdst, bool did_rsc)
1894 {
1895         struct vxlan_dev *vxlan = netdev_priv(dev);
1896         struct rtable *rt = NULL;
1897         const struct iphdr *old_iph;
1898         struct flowi4 fl4;
1899         union vxlan_addr *dst;
1900         struct vxlan_metadata md;
1901         __be16 src_port = 0, dst_port;
1902         u32 vni;
1903         __be16 df = 0;
1904         __u8 tos, ttl;
1905         int err;
1906
1907         dst_port = rdst->remote_port ? rdst->remote_port : vxlan->dst_port;
1908         vni = rdst->remote_vni;
1909         dst = &rdst->remote_ip;
1910
1911         if (vxlan_addr_any(dst)) {
1912                 if (did_rsc) {
1913                         /* short-circuited back to local bridge */
1914                         vxlan_encap_bypass(skb, vxlan, vxlan);
1915                         return;
1916                 }
1917                 goto drop;
1918         }
1919
1920         old_iph = ip_hdr(skb);
1921
1922         ttl = vxlan->ttl;
1923         if (!ttl && vxlan_addr_multicast(dst))
1924                 ttl = 1;
1925
1926         tos = vxlan->tos;
1927         if (tos == 1)
1928                 tos = ip_tunnel_get_dsfield(old_iph, skb);
1929
1930         src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->port_min,
1931                                      vxlan->port_max, true);
1932
1933         if (dst->sa.sa_family == AF_INET) {
1934                 memset(&fl4, 0, sizeof(fl4));
1935                 fl4.flowi4_oif = rdst->remote_ifindex;
1936                 fl4.flowi4_tos = RT_TOS(tos);
1937                 fl4.daddr = dst->sin.sin_addr.s_addr;
1938                 fl4.saddr = vxlan->saddr.sin.sin_addr.s_addr;
1939
1940                 rt = ip_route_output_key(vxlan->net, &fl4);
1941                 if (IS_ERR(rt)) {
1942                         netdev_dbg(dev, "no route to %pI4\n",
1943                                    &dst->sin.sin_addr.s_addr);
1944                         dev->stats.tx_carrier_errors++;
1945                         goto tx_error;
1946                 }
1947
1948                 if (rt->dst.dev == dev) {
1949                         netdev_dbg(dev, "circular route to %pI4\n",
1950                                    &dst->sin.sin_addr.s_addr);
1951                         dev->stats.collisions++;
1952                         goto rt_tx_error;
1953                 }
1954
1955                 /* Bypass encapsulation if the destination is local */
1956                 if (rt->rt_flags & RTCF_LOCAL &&
1957                     !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
1958                         struct vxlan_dev *dst_vxlan;
1959
1960                         ip_rt_put(rt);
1961                         dst_vxlan = vxlan_find_vni(vxlan->net, vni,
1962                                                    dst->sa.sa_family, dst_port,
1963                                                    vxlan->flags);
1964                         if (!dst_vxlan)
1965                                 goto tx_error;
1966                         vxlan_encap_bypass(skb, vxlan, dst_vxlan);
1967                         return;
1968                 }
1969
1970                 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
1971                 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
1972                 md.vni = htonl(vni << 8);
1973                 md.gbp = skb->mark;
1974
1975                 err = vxlan_xmit_skb(rt, skb, fl4.saddr,
1976                                      dst->sin.sin_addr.s_addr, tos, ttl, df,
1977                                      src_port, dst_port, &md,
1978                                      !net_eq(vxlan->net, dev_net(vxlan->dev)),
1979                                      vxlan->flags);
1980                 if (err < 0) {
1981                         /* skb is already freed. */
1982                         skb = NULL;
1983                         goto rt_tx_error;
1984                 }
1985
1986                 iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
1987 #if IS_ENABLED(CONFIG_IPV6)
1988         } else {
1989                 struct sock *sk = vxlan->vn_sock->sock->sk;
1990                 struct dst_entry *ndst;
1991                 struct flowi6 fl6;
1992                 u32 flags;
1993
1994                 memset(&fl6, 0, sizeof(fl6));
1995                 fl6.flowi6_oif = rdst->remote_ifindex;
1996                 fl6.daddr = dst->sin6.sin6_addr;
1997                 fl6.saddr = vxlan->saddr.sin6.sin6_addr;
1998                 fl6.flowi6_proto = IPPROTO_UDP;
1999
2000                 if (ipv6_stub->ipv6_dst_lookup(sk, &ndst, &fl6)) {
2001                         netdev_dbg(dev, "no route to %pI6\n",
2002                                    &dst->sin6.sin6_addr);
2003                         dev->stats.tx_carrier_errors++;
2004                         goto tx_error;
2005                 }
2006
2007                 if (ndst->dev == dev) {
2008                         netdev_dbg(dev, "circular route to %pI6\n",
2009                                    &dst->sin6.sin6_addr);
2010                         dst_release(ndst);
2011                         dev->stats.collisions++;
2012                         goto tx_error;
2013                 }
2014
2015                 /* Bypass encapsulation if the destination is local */
2016                 flags = ((struct rt6_info *)ndst)->rt6i_flags;
2017                 if (flags & RTF_LOCAL &&
2018                     !(flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2019                         struct vxlan_dev *dst_vxlan;
2020
2021                         dst_release(ndst);
2022                         dst_vxlan = vxlan_find_vni(vxlan->net, vni,
2023                                                    dst->sa.sa_family, dst_port,
2024                                                    vxlan->flags);
2025                         if (!dst_vxlan)
2026                                 goto tx_error;
2027                         vxlan_encap_bypass(skb, vxlan, dst_vxlan);
2028                         return;
2029                 }
2030
2031                 ttl = ttl ? : ip6_dst_hoplimit(ndst);
2032                 md.vni = htonl(vni << 8);
2033                 md.gbp = skb->mark;
2034
2035                 err = vxlan6_xmit_skb(ndst, skb, dev, &fl6.saddr, &fl6.daddr,
2036                                       0, ttl, src_port, dst_port, &md,
2037                                       !net_eq(vxlan->net, dev_net(vxlan->dev)),
2038                                       vxlan->flags);
2039 #endif
2040         }
2041
2042         return;
2043
2044 drop:
2045         dev->stats.tx_dropped++;
2046         goto tx_free;
2047
2048 rt_tx_error:
2049         ip_rt_put(rt);
2050 tx_error:
2051         dev->stats.tx_errors++;
2052 tx_free:
2053         dev_kfree_skb(skb);
2054 }
2055
2056 /* Transmit local packets over Vxlan
2057  *
2058  * Outer IP header inherits ECN and DF from inner header.
2059  * Outer UDP destination is the VXLAN assigned port.
2060  *           source port is based on hash of flow
2061  */
2062 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
2063 {
2064         struct vxlan_dev *vxlan = netdev_priv(dev);
2065         struct ethhdr *eth;
2066         bool did_rsc = false;
2067         struct vxlan_rdst *rdst, *fdst = NULL;
2068         struct vxlan_fdb *f;
2069
2070         skb_reset_mac_header(skb);
2071         eth = eth_hdr(skb);
2072
2073         if ((vxlan->flags & VXLAN_F_PROXY)) {
2074                 if (ntohs(eth->h_proto) == ETH_P_ARP)
2075                         return arp_reduce(dev, skb);
2076 #if IS_ENABLED(CONFIG_IPV6)
2077                 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
2078                          pskb_may_pull(skb, sizeof(struct ipv6hdr)
2079                                        + sizeof(struct nd_msg)) &&
2080                          ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
2081                                 struct nd_msg *msg;
2082
2083                                 msg = (struct nd_msg *)skb_transport_header(skb);
2084                                 if (msg->icmph.icmp6_code == 0 &&
2085                                     msg->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
2086                                         return neigh_reduce(dev, skb);
2087                 }
2088                 eth = eth_hdr(skb);
2089 #endif
2090         }
2091
2092         f = vxlan_find_mac(vxlan, eth->h_dest);
2093         did_rsc = false;
2094
2095         if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) &&
2096             (ntohs(eth->h_proto) == ETH_P_IP ||
2097              ntohs(eth->h_proto) == ETH_P_IPV6)) {
2098                 did_rsc = route_shortcircuit(dev, skb);
2099                 if (did_rsc)
2100                         f = vxlan_find_mac(vxlan, eth->h_dest);
2101         }
2102
2103         if (f == NULL) {
2104                 f = vxlan_find_mac(vxlan, all_zeros_mac);
2105                 if (f == NULL) {
2106                         if ((vxlan->flags & VXLAN_F_L2MISS) &&
2107                             !is_multicast_ether_addr(eth->h_dest))
2108                                 vxlan_fdb_miss(vxlan, eth->h_dest);
2109
2110                         dev->stats.tx_dropped++;
2111                         kfree_skb(skb);
2112                         return NETDEV_TX_OK;
2113                 }
2114         }
2115
2116         list_for_each_entry_rcu(rdst, &f->remotes, list) {
2117                 struct sk_buff *skb1;
2118
2119                 if (!fdst) {
2120                         fdst = rdst;
2121                         continue;
2122                 }
2123                 skb1 = skb_clone(skb, GFP_ATOMIC);
2124                 if (skb1)
2125                         vxlan_xmit_one(skb1, dev, rdst, did_rsc);
2126         }
2127
2128         if (fdst)
2129                 vxlan_xmit_one(skb, dev, fdst, did_rsc);
2130         else
2131                 kfree_skb(skb);
2132         return NETDEV_TX_OK;
2133 }
2134
2135 /* Walk the forwarding table and purge stale entries */
2136 static void vxlan_cleanup(unsigned long arg)
2137 {
2138         struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
2139         unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2140         unsigned int h;
2141
2142         if (!netif_running(vxlan->dev))
2143                 return;
2144
2145         spin_lock_bh(&vxlan->hash_lock);
2146         for (h = 0; h < FDB_HASH_SIZE; ++h) {
2147                 struct hlist_node *p, *n;
2148                 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2149                         struct vxlan_fdb *f
2150                                 = container_of(p, struct vxlan_fdb, hlist);
2151                         unsigned long timeout;
2152
2153                         if (f->state & NUD_PERMANENT)
2154                                 continue;
2155
2156                         timeout = f->used + vxlan->age_interval * HZ;
2157                         if (time_before_eq(timeout, jiffies)) {
2158                                 netdev_dbg(vxlan->dev,
2159                                            "garbage collect %pM\n",
2160                                            f->eth_addr);
2161                                 f->state = NUD_STALE;
2162                                 vxlan_fdb_destroy(vxlan, f);
2163                         } else if (time_before(timeout, next_timer))
2164                                 next_timer = timeout;
2165                 }
2166         }
2167         spin_unlock_bh(&vxlan->hash_lock);
2168
2169         mod_timer(&vxlan->age_timer, next_timer);
2170 }
2171
2172 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan)
2173 {
2174         __u32 vni = vxlan->default_dst.remote_vni;
2175
2176         vxlan->vn_sock = vs;
2177         hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
2178 }
2179
2180 /* Setup stats when device is created */
2181 static int vxlan_init(struct net_device *dev)
2182 {
2183         struct vxlan_dev *vxlan = netdev_priv(dev);
2184         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2185         struct vxlan_sock *vs;
2186         bool ipv6 = vxlan->flags & VXLAN_F_IPV6;
2187
2188         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2189         if (!dev->tstats)
2190                 return -ENOMEM;
2191
2192         spin_lock(&vn->sock_lock);
2193         vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
2194                              vxlan->dst_port, vxlan->flags);
2195         if (vs && atomic_add_unless(&vs->refcnt, 1, 0)) {
2196                 /* If we have a socket with same port already, reuse it */
2197                 vxlan_vs_add_dev(vs, vxlan);
2198         } else {
2199                 /* otherwise make new socket outside of RTNL */
2200                 dev_hold(dev);
2201                 queue_work(vxlan_wq, &vxlan->sock_work);
2202         }
2203         spin_unlock(&vn->sock_lock);
2204
2205         return 0;
2206 }
2207
2208 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan)
2209 {
2210         struct vxlan_fdb *f;
2211
2212         spin_lock_bh(&vxlan->hash_lock);
2213         f = __vxlan_find_mac(vxlan, all_zeros_mac);
2214         if (f)
2215                 vxlan_fdb_destroy(vxlan, f);
2216         spin_unlock_bh(&vxlan->hash_lock);
2217 }
2218
2219 static void vxlan_uninit(struct net_device *dev)
2220 {
2221         struct vxlan_dev *vxlan = netdev_priv(dev);
2222         struct vxlan_sock *vs = vxlan->vn_sock;
2223
2224         vxlan_fdb_delete_default(vxlan);
2225
2226         if (vs)
2227                 vxlan_sock_release(vs);
2228         free_percpu(dev->tstats);
2229 }
2230
2231 /* Start ageing timer and join group when device is brought up */
2232 static int vxlan_open(struct net_device *dev)
2233 {
2234         struct vxlan_dev *vxlan = netdev_priv(dev);
2235         struct vxlan_sock *vs = vxlan->vn_sock;
2236
2237         /* socket hasn't been created */
2238         if (!vs)
2239                 return -ENOTCONN;
2240
2241         if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
2242                 vxlan_sock_hold(vs);
2243                 dev_hold(dev);
2244                 queue_work(vxlan_wq, &vxlan->igmp_join);
2245         }
2246
2247         if (vxlan->age_interval)
2248                 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2249
2250         return 0;
2251 }
2252
2253 /* Purge the forwarding table */
2254 static void vxlan_flush(struct vxlan_dev *vxlan)
2255 {
2256         unsigned int h;
2257
2258         spin_lock_bh(&vxlan->hash_lock);
2259         for (h = 0; h < FDB_HASH_SIZE; ++h) {
2260                 struct hlist_node *p, *n;
2261                 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2262                         struct vxlan_fdb *f
2263                                 = container_of(p, struct vxlan_fdb, hlist);
2264                         /* the all_zeros_mac entry is deleted at vxlan_uninit */
2265                         if (!is_zero_ether_addr(f->eth_addr))
2266                                 vxlan_fdb_destroy(vxlan, f);
2267                 }
2268         }
2269         spin_unlock_bh(&vxlan->hash_lock);
2270 }
2271
2272 /* Cleanup timer and forwarding table on shutdown */
2273 static int vxlan_stop(struct net_device *dev)
2274 {
2275         struct vxlan_dev *vxlan = netdev_priv(dev);
2276         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2277         struct vxlan_sock *vs = vxlan->vn_sock;
2278
2279         if (vs && vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
2280             !vxlan_group_used(vn, vxlan)) {
2281                 vxlan_sock_hold(vs);
2282                 dev_hold(dev);
2283                 queue_work(vxlan_wq, &vxlan->igmp_leave);
2284         }
2285
2286         del_timer_sync(&vxlan->age_timer);
2287
2288         vxlan_flush(vxlan);
2289
2290         return 0;
2291 }
2292
2293 /* Stub, nothing needs to be done. */
2294 static void vxlan_set_multicast_list(struct net_device *dev)
2295 {
2296 }
2297
2298 static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2299 {
2300         struct vxlan_dev *vxlan = netdev_priv(dev);
2301         struct vxlan_rdst *dst = &vxlan->default_dst;
2302         struct net_device *lowerdev;
2303         int max_mtu;
2304
2305         lowerdev = __dev_get_by_index(vxlan->net, dst->remote_ifindex);
2306         if (lowerdev == NULL)
2307                 return eth_change_mtu(dev, new_mtu);
2308
2309         if (dst->remote_ip.sa.sa_family == AF_INET6)
2310                 max_mtu = lowerdev->mtu - VXLAN6_HEADROOM;
2311         else
2312                 max_mtu = lowerdev->mtu - VXLAN_HEADROOM;
2313
2314         if (new_mtu < 68 || new_mtu > max_mtu)
2315                 return -EINVAL;
2316
2317         dev->mtu = new_mtu;
2318         return 0;
2319 }
2320
2321 static const struct net_device_ops vxlan_netdev_ops = {
2322         .ndo_init               = vxlan_init,
2323         .ndo_uninit             = vxlan_uninit,
2324         .ndo_open               = vxlan_open,
2325         .ndo_stop               = vxlan_stop,
2326         .ndo_start_xmit         = vxlan_xmit,
2327         .ndo_get_stats64        = ip_tunnel_get_stats64,
2328         .ndo_set_rx_mode        = vxlan_set_multicast_list,
2329         .ndo_change_mtu         = vxlan_change_mtu,
2330         .ndo_validate_addr      = eth_validate_addr,
2331         .ndo_set_mac_address    = eth_mac_addr,
2332         .ndo_fdb_add            = vxlan_fdb_add,
2333         .ndo_fdb_del            = vxlan_fdb_delete,
2334         .ndo_fdb_dump           = vxlan_fdb_dump,
2335 };
2336
2337 /* Info for udev, that this is a virtual tunnel endpoint */
2338 static struct device_type vxlan_type = {
2339         .name = "vxlan",
2340 };
2341
2342 /* Calls the ndo_add_vxlan_port of the caller in order to
2343  * supply the listening VXLAN udp ports. Callers are expected
2344  * to implement the ndo_add_vxlan_port.
2345  */
2346 void vxlan_get_rx_port(struct net_device *dev)
2347 {
2348         struct vxlan_sock *vs;
2349         struct net *net = dev_net(dev);
2350         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2351         sa_family_t sa_family;
2352         __be16 port;
2353         unsigned int i;
2354
2355         spin_lock(&vn->sock_lock);
2356         for (i = 0; i < PORT_HASH_SIZE; ++i) {
2357                 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
2358                         port = inet_sk(vs->sock->sk)->inet_sport;
2359                         sa_family = vs->sock->sk->sk_family;
2360                         dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
2361                                                             port);
2362                 }
2363         }
2364         spin_unlock(&vn->sock_lock);
2365 }
2366 EXPORT_SYMBOL_GPL(vxlan_get_rx_port);
2367
2368 /* Initialize the device structure. */
2369 static void vxlan_setup(struct net_device *dev)
2370 {
2371         struct vxlan_dev *vxlan = netdev_priv(dev);
2372         unsigned int h;
2373
2374         eth_hw_addr_random(dev);
2375         ether_setup(dev);
2376         if (vxlan->default_dst.remote_ip.sa.sa_family == AF_INET6)
2377                 dev->needed_headroom = ETH_HLEN + VXLAN6_HEADROOM;
2378         else
2379                 dev->needed_headroom = ETH_HLEN + VXLAN_HEADROOM;
2380
2381         dev->netdev_ops = &vxlan_netdev_ops;
2382         dev->destructor = free_netdev;
2383         SET_NETDEV_DEVTYPE(dev, &vxlan_type);
2384
2385         dev->tx_queue_len = 0;
2386         dev->features   |= NETIF_F_LLTX;
2387         dev->features   |= NETIF_F_SG | NETIF_F_HW_CSUM;
2388         dev->features   |= NETIF_F_RXCSUM;
2389         dev->features   |= NETIF_F_GSO_SOFTWARE;
2390
2391         dev->vlan_features = dev->features;
2392         dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2393         dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
2394         dev->hw_features |= NETIF_F_GSO_SOFTWARE;
2395         dev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2396         netif_keep_dst(dev);
2397         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2398
2399         INIT_LIST_HEAD(&vxlan->next);
2400         spin_lock_init(&vxlan->hash_lock);
2401         INIT_WORK(&vxlan->igmp_join, vxlan_igmp_join);
2402         INIT_WORK(&vxlan->igmp_leave, vxlan_igmp_leave);
2403         INIT_WORK(&vxlan->sock_work, vxlan_sock_work);
2404
2405         init_timer_deferrable(&vxlan->age_timer);
2406         vxlan->age_timer.function = vxlan_cleanup;
2407         vxlan->age_timer.data = (unsigned long) vxlan;
2408
2409         vxlan->dst_port = htons(vxlan_port);
2410
2411         vxlan->dev = dev;
2412
2413         for (h = 0; h < FDB_HASH_SIZE; ++h)
2414                 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
2415 }
2416
2417 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
2418         [IFLA_VXLAN_ID]         = { .type = NLA_U32 },
2419         [IFLA_VXLAN_GROUP]      = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
2420         [IFLA_VXLAN_GROUP6]     = { .len = sizeof(struct in6_addr) },
2421         [IFLA_VXLAN_LINK]       = { .type = NLA_U32 },
2422         [IFLA_VXLAN_LOCAL]      = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
2423         [IFLA_VXLAN_LOCAL6]     = { .len = sizeof(struct in6_addr) },
2424         [IFLA_VXLAN_TOS]        = { .type = NLA_U8 },
2425         [IFLA_VXLAN_TTL]        = { .type = NLA_U8 },
2426         [IFLA_VXLAN_LEARNING]   = { .type = NLA_U8 },
2427         [IFLA_VXLAN_AGEING]     = { .type = NLA_U32 },
2428         [IFLA_VXLAN_LIMIT]      = { .type = NLA_U32 },
2429         [IFLA_VXLAN_PORT_RANGE] = { .len  = sizeof(struct ifla_vxlan_port_range) },
2430         [IFLA_VXLAN_PROXY]      = { .type = NLA_U8 },
2431         [IFLA_VXLAN_RSC]        = { .type = NLA_U8 },
2432         [IFLA_VXLAN_L2MISS]     = { .type = NLA_U8 },
2433         [IFLA_VXLAN_L3MISS]     = { .type = NLA_U8 },
2434         [IFLA_VXLAN_PORT]       = { .type = NLA_U16 },
2435         [IFLA_VXLAN_UDP_CSUM]   = { .type = NLA_U8 },
2436         [IFLA_VXLAN_UDP_ZERO_CSUM6_TX]  = { .type = NLA_U8 },
2437         [IFLA_VXLAN_UDP_ZERO_CSUM6_RX]  = { .type = NLA_U8 },
2438         [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 },
2439         [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
2440         [IFLA_VXLAN_GBP]        = { .type = NLA_FLAG, },
2441 };
2442
2443 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
2444 {
2445         if (tb[IFLA_ADDRESS]) {
2446                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
2447                         pr_debug("invalid link address (not ethernet)\n");
2448                         return -EINVAL;
2449                 }
2450
2451                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
2452                         pr_debug("invalid all zero ethernet address\n");
2453                         return -EADDRNOTAVAIL;
2454                 }
2455         }
2456
2457         if (!data)
2458                 return -EINVAL;
2459
2460         if (data[IFLA_VXLAN_ID]) {
2461                 __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
2462                 if (id >= VXLAN_VID_MASK)
2463                         return -ERANGE;
2464         }
2465
2466         if (data[IFLA_VXLAN_PORT_RANGE]) {
2467                 const struct ifla_vxlan_port_range *p
2468                         = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2469
2470                 if (ntohs(p->high) < ntohs(p->low)) {
2471                         pr_debug("port range %u .. %u not valid\n",
2472                                  ntohs(p->low), ntohs(p->high));
2473                         return -EINVAL;
2474                 }
2475         }
2476
2477         return 0;
2478 }
2479
2480 static void vxlan_get_drvinfo(struct net_device *netdev,
2481                               struct ethtool_drvinfo *drvinfo)
2482 {
2483         strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
2484         strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
2485 }
2486
2487 static const struct ethtool_ops vxlan_ethtool_ops = {
2488         .get_drvinfo    = vxlan_get_drvinfo,
2489         .get_link       = ethtool_op_get_link,
2490 };
2491
2492 static void vxlan_del_work(struct work_struct *work)
2493 {
2494         struct vxlan_sock *vs = container_of(work, struct vxlan_sock, del_work);
2495         udp_tunnel_sock_release(vs->sock);
2496         kfree_rcu(vs, rcu);
2497 }
2498
2499 static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
2500                                         __be16 port, u32 flags)
2501 {
2502         struct socket *sock;
2503         struct udp_port_cfg udp_conf;
2504         int err;
2505
2506         memset(&udp_conf, 0, sizeof(udp_conf));
2507
2508         if (ipv6) {
2509                 udp_conf.family = AF_INET6;
2510                 udp_conf.use_udp6_rx_checksums =
2511                     !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
2512         } else {
2513                 udp_conf.family = AF_INET;
2514                 udp_conf.local_ip.s_addr = INADDR_ANY;
2515         }
2516
2517         udp_conf.local_udp_port = port;
2518
2519         /* Open UDP socket */
2520         err = udp_sock_create(net, &udp_conf, &sock);
2521         if (err < 0)
2522                 return ERR_PTR(err);
2523
2524         return sock;
2525 }
2526
2527 /* Create new listen socket if needed */
2528 static struct vxlan_sock *vxlan_socket_create(struct net *net, __be16 port,
2529                                               vxlan_rcv_t *rcv, void *data,
2530                                               u32 flags)
2531 {
2532         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2533         struct vxlan_sock *vs;
2534         struct socket *sock;
2535         unsigned int h;
2536         bool ipv6 = !!(flags & VXLAN_F_IPV6);
2537         struct udp_tunnel_sock_cfg tunnel_cfg;
2538
2539         vs = kzalloc(sizeof(*vs), GFP_KERNEL);
2540         if (!vs)
2541                 return ERR_PTR(-ENOMEM);
2542
2543         for (h = 0; h < VNI_HASH_SIZE; ++h)
2544                 INIT_HLIST_HEAD(&vs->vni_list[h]);
2545
2546         INIT_WORK(&vs->del_work, vxlan_del_work);
2547
2548         sock = vxlan_create_sock(net, ipv6, port, flags);
2549         if (IS_ERR(sock)) {
2550                 kfree(vs);
2551                 return ERR_CAST(sock);
2552         }
2553
2554         vs->sock = sock;
2555         atomic_set(&vs->refcnt, 1);
2556         vs->rcv = rcv;
2557         vs->data = data;
2558         vs->flags = (flags & VXLAN_F_RCV_FLAGS);
2559
2560         /* Initialize the vxlan udp offloads structure */
2561         vs->udp_offloads.port = port;
2562         vs->udp_offloads.callbacks.gro_receive  = vxlan_gro_receive;
2563         vs->udp_offloads.callbacks.gro_complete = vxlan_gro_complete;
2564
2565         spin_lock(&vn->sock_lock);
2566         hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
2567         vxlan_notify_add_rx_port(vs);
2568         spin_unlock(&vn->sock_lock);
2569
2570         /* Mark socket as an encapsulation socket. */
2571         tunnel_cfg.sk_user_data = vs;
2572         tunnel_cfg.encap_type = 1;
2573         tunnel_cfg.encap_rcv = vxlan_udp_encap_recv;
2574         tunnel_cfg.encap_destroy = NULL;
2575
2576         setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
2577
2578         return vs;
2579 }
2580
2581 struct vxlan_sock *vxlan_sock_add(struct net *net, __be16 port,
2582                                   vxlan_rcv_t *rcv, void *data,
2583                                   bool no_share, u32 flags)
2584 {
2585         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2586         struct vxlan_sock *vs;
2587         bool ipv6 = flags & VXLAN_F_IPV6;
2588
2589         vs = vxlan_socket_create(net, port, rcv, data, flags);
2590         if (!IS_ERR(vs))
2591                 return vs;
2592
2593         if (no_share)   /* Return error if sharing is not allowed. */
2594                 return vs;
2595
2596         spin_lock(&vn->sock_lock);
2597         vs = vxlan_find_sock(net, ipv6 ? AF_INET6 : AF_INET, port, flags);
2598         if (vs && ((vs->rcv != rcv) ||
2599                    !atomic_add_unless(&vs->refcnt, 1, 0)))
2600                         vs = ERR_PTR(-EBUSY);
2601         spin_unlock(&vn->sock_lock);
2602
2603         if (!vs)
2604                 vs = ERR_PTR(-EINVAL);
2605
2606         return vs;
2607 }
2608 EXPORT_SYMBOL_GPL(vxlan_sock_add);
2609
2610 /* Scheduled at device creation to bind to a socket */
2611 static void vxlan_sock_work(struct work_struct *work)
2612 {
2613         struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, sock_work);
2614         struct net *net = vxlan->net;
2615         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2616         __be16 port = vxlan->dst_port;
2617         struct vxlan_sock *nvs;
2618
2619         nvs = vxlan_sock_add(net, port, vxlan_rcv, NULL, false, vxlan->flags);
2620         spin_lock(&vn->sock_lock);
2621         if (!IS_ERR(nvs))
2622                 vxlan_vs_add_dev(nvs, vxlan);
2623         spin_unlock(&vn->sock_lock);
2624
2625         dev_put(vxlan->dev);
2626 }
2627
2628 static int vxlan_newlink(struct net *src_net, struct net_device *dev,
2629                          struct nlattr *tb[], struct nlattr *data[])
2630 {
2631         struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
2632         struct vxlan_dev *vxlan = netdev_priv(dev);
2633         struct vxlan_rdst *dst = &vxlan->default_dst;
2634         __u32 vni;
2635         int err;
2636         bool use_ipv6 = false;
2637
2638         if (!data[IFLA_VXLAN_ID])
2639                 return -EINVAL;
2640
2641         vxlan->net = src_net;
2642
2643         vni = nla_get_u32(data[IFLA_VXLAN_ID]);
2644         dst->remote_vni = vni;
2645
2646         /* Unless IPv6 is explicitly requested, assume IPv4 */
2647         dst->remote_ip.sa.sa_family = AF_INET;
2648         if (data[IFLA_VXLAN_GROUP]) {
2649                 dst->remote_ip.sin.sin_addr.s_addr = nla_get_be32(data[IFLA_VXLAN_GROUP]);
2650         } else if (data[IFLA_VXLAN_GROUP6]) {
2651                 if (!IS_ENABLED(CONFIG_IPV6))
2652                         return -EPFNOSUPPORT;
2653
2654                 nla_memcpy(&dst->remote_ip.sin6.sin6_addr, data[IFLA_VXLAN_GROUP6],
2655                            sizeof(struct in6_addr));
2656                 dst->remote_ip.sa.sa_family = AF_INET6;
2657                 use_ipv6 = true;
2658         }
2659
2660         if (data[IFLA_VXLAN_LOCAL]) {
2661                 vxlan->saddr.sin.sin_addr.s_addr = nla_get_be32(data[IFLA_VXLAN_LOCAL]);
2662                 vxlan->saddr.sa.sa_family = AF_INET;
2663         } else if (data[IFLA_VXLAN_LOCAL6]) {
2664                 if (!IS_ENABLED(CONFIG_IPV6))
2665                         return -EPFNOSUPPORT;
2666
2667                 /* TODO: respect scope id */
2668                 nla_memcpy(&vxlan->saddr.sin6.sin6_addr, data[IFLA_VXLAN_LOCAL6],
2669                            sizeof(struct in6_addr));
2670                 vxlan->saddr.sa.sa_family = AF_INET6;
2671                 use_ipv6 = true;
2672         }
2673
2674         if (data[IFLA_VXLAN_LINK] &&
2675             (dst->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]))) {
2676                 struct net_device *lowerdev
2677                          = __dev_get_by_index(src_net, dst->remote_ifindex);
2678
2679                 if (!lowerdev) {
2680                         pr_info("ifindex %d does not exist\n", dst->remote_ifindex);
2681                         return -ENODEV;
2682                 }
2683
2684 #if IS_ENABLED(CONFIG_IPV6)
2685                 if (use_ipv6) {
2686                         struct inet6_dev *idev = __in6_dev_get(lowerdev);
2687                         if (idev && idev->cnf.disable_ipv6) {
2688                                 pr_info("IPv6 is disabled via sysctl\n");
2689                                 return -EPERM;
2690                         }
2691                         vxlan->flags |= VXLAN_F_IPV6;
2692                 }
2693 #endif
2694
2695                 if (!tb[IFLA_MTU])
2696                         dev->mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2697
2698                 dev->needed_headroom = lowerdev->hard_header_len +
2699                                        (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2700         } else if (use_ipv6)
2701                 vxlan->flags |= VXLAN_F_IPV6;
2702
2703         if (data[IFLA_VXLAN_TOS])
2704                 vxlan->tos  = nla_get_u8(data[IFLA_VXLAN_TOS]);
2705
2706         if (data[IFLA_VXLAN_TTL])
2707                 vxlan->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
2708
2709         if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING]))
2710                 vxlan->flags |= VXLAN_F_LEARN;
2711
2712         if (data[IFLA_VXLAN_AGEING])
2713                 vxlan->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
2714         else
2715                 vxlan->age_interval = FDB_AGE_DEFAULT;
2716
2717         if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY]))
2718                 vxlan->flags |= VXLAN_F_PROXY;
2719
2720         if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC]))
2721                 vxlan->flags |= VXLAN_F_RSC;
2722
2723         if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS]))
2724                 vxlan->flags |= VXLAN_F_L2MISS;
2725
2726         if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS]))
2727                 vxlan->flags |= VXLAN_F_L3MISS;
2728
2729         if (data[IFLA_VXLAN_LIMIT])
2730                 vxlan->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
2731
2732         if (data[IFLA_VXLAN_PORT_RANGE]) {
2733                 const struct ifla_vxlan_port_range *p
2734                         = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2735                 vxlan->port_min = ntohs(p->low);
2736                 vxlan->port_max = ntohs(p->high);
2737         }
2738
2739         if (data[IFLA_VXLAN_PORT])
2740                 vxlan->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
2741
2742         if (data[IFLA_VXLAN_UDP_CSUM] && nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
2743                 vxlan->flags |= VXLAN_F_UDP_CSUM;
2744
2745         if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX] &&
2746             nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
2747                 vxlan->flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
2748
2749         if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX] &&
2750             nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
2751                 vxlan->flags |= VXLAN_F_UDP_ZERO_CSUM6_RX;
2752
2753         if (data[IFLA_VXLAN_REMCSUM_TX] &&
2754             nla_get_u8(data[IFLA_VXLAN_REMCSUM_TX]))
2755                 vxlan->flags |= VXLAN_F_REMCSUM_TX;
2756
2757         if (data[IFLA_VXLAN_REMCSUM_RX] &&
2758             nla_get_u8(data[IFLA_VXLAN_REMCSUM_RX]))
2759                 vxlan->flags |= VXLAN_F_REMCSUM_RX;
2760
2761         if (data[IFLA_VXLAN_GBP])
2762                 vxlan->flags |= VXLAN_F_GBP;
2763
2764         if (vxlan_find_vni(src_net, vni, use_ipv6 ? AF_INET6 : AF_INET,
2765                            vxlan->dst_port, vxlan->flags)) {
2766                 pr_info("duplicate VNI %u\n", vni);
2767                 return -EEXIST;
2768         }
2769
2770         dev->ethtool_ops = &vxlan_ethtool_ops;
2771
2772         /* create an fdb entry for a valid default destination */
2773         if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
2774                 err = vxlan_fdb_create(vxlan, all_zeros_mac,
2775                                        &vxlan->default_dst.remote_ip,
2776                                        NUD_REACHABLE|NUD_PERMANENT,
2777                                        NLM_F_EXCL|NLM_F_CREATE,
2778                                        vxlan->dst_port,
2779                                        vxlan->default_dst.remote_vni,
2780                                        vxlan->default_dst.remote_ifindex,
2781                                        NTF_SELF);
2782                 if (err)
2783                         return err;
2784         }
2785
2786         err = register_netdevice(dev);
2787         if (err) {
2788                 vxlan_fdb_delete_default(vxlan);
2789                 return err;
2790         }
2791
2792         list_add(&vxlan->next, &vn->vxlan_list);
2793
2794         return 0;
2795 }
2796
2797 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
2798 {
2799         struct vxlan_dev *vxlan = netdev_priv(dev);
2800         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2801
2802         spin_lock(&vn->sock_lock);
2803         if (!hlist_unhashed(&vxlan->hlist))
2804                 hlist_del_rcu(&vxlan->hlist);
2805         spin_unlock(&vn->sock_lock);
2806
2807         list_del(&vxlan->next);
2808         unregister_netdevice_queue(dev, head);
2809 }
2810
2811 static size_t vxlan_get_size(const struct net_device *dev)
2812 {
2813
2814         return nla_total_size(sizeof(__u32)) +  /* IFLA_VXLAN_ID */
2815                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
2816                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
2817                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
2818                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TTL */
2819                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TOS */
2820                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_LEARNING */
2821                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_PROXY */
2822                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_RSC */
2823                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_L2MISS */
2824                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_L3MISS */
2825                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
2826                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
2827                 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
2828                 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
2829                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
2830                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
2831                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
2832                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
2833                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
2834                 0;
2835 }
2836
2837 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
2838 {
2839         const struct vxlan_dev *vxlan = netdev_priv(dev);
2840         const struct vxlan_rdst *dst = &vxlan->default_dst;
2841         struct ifla_vxlan_port_range ports = {
2842                 .low =  htons(vxlan->port_min),
2843                 .high = htons(vxlan->port_max),
2844         };
2845
2846         if (nla_put_u32(skb, IFLA_VXLAN_ID, dst->remote_vni))
2847                 goto nla_put_failure;
2848
2849         if (!vxlan_addr_any(&dst->remote_ip)) {
2850                 if (dst->remote_ip.sa.sa_family == AF_INET) {
2851                         if (nla_put_be32(skb, IFLA_VXLAN_GROUP,
2852                                          dst->remote_ip.sin.sin_addr.s_addr))
2853                                 goto nla_put_failure;
2854 #if IS_ENABLED(CONFIG_IPV6)
2855                 } else {
2856                         if (nla_put(skb, IFLA_VXLAN_GROUP6, sizeof(struct in6_addr),
2857                                     &dst->remote_ip.sin6.sin6_addr))
2858                                 goto nla_put_failure;
2859 #endif
2860                 }
2861         }
2862
2863         if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
2864                 goto nla_put_failure;
2865
2866         if (!vxlan_addr_any(&vxlan->saddr)) {
2867                 if (vxlan->saddr.sa.sa_family == AF_INET) {
2868                         if (nla_put_be32(skb, IFLA_VXLAN_LOCAL,
2869                                          vxlan->saddr.sin.sin_addr.s_addr))
2870                                 goto nla_put_failure;
2871 #if IS_ENABLED(CONFIG_IPV6)
2872                 } else {
2873                         if (nla_put(skb, IFLA_VXLAN_LOCAL6, sizeof(struct in6_addr),
2874                                     &vxlan->saddr.sin6.sin6_addr))
2875                                 goto nla_put_failure;
2876 #endif
2877                 }
2878         }
2879
2880         if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->ttl) ||
2881             nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->tos) ||
2882             nla_put_u8(skb, IFLA_VXLAN_LEARNING,
2883                         !!(vxlan->flags & VXLAN_F_LEARN)) ||
2884             nla_put_u8(skb, IFLA_VXLAN_PROXY,
2885                         !!(vxlan->flags & VXLAN_F_PROXY)) ||
2886             nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) ||
2887             nla_put_u8(skb, IFLA_VXLAN_L2MISS,
2888                         !!(vxlan->flags & VXLAN_F_L2MISS)) ||
2889             nla_put_u8(skb, IFLA_VXLAN_L3MISS,
2890                         !!(vxlan->flags & VXLAN_F_L3MISS)) ||
2891             nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->age_interval) ||
2892             nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->addrmax) ||
2893             nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->dst_port) ||
2894             nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
2895                         !!(vxlan->flags & VXLAN_F_UDP_CSUM)) ||
2896             nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
2897                         !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
2898             nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
2899                         !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
2900             nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
2901                         !!(vxlan->flags & VXLAN_F_REMCSUM_TX)) ||
2902             nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
2903                         !!(vxlan->flags & VXLAN_F_REMCSUM_RX)))
2904                 goto nla_put_failure;
2905
2906         if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
2907                 goto nla_put_failure;
2908
2909         if (vxlan->flags & VXLAN_F_GBP &&
2910             nla_put_flag(skb, IFLA_VXLAN_GBP))
2911                 goto nla_put_failure;
2912
2913         return 0;
2914
2915 nla_put_failure:
2916         return -EMSGSIZE;
2917 }
2918
2919 static struct net *vxlan_get_link_net(const struct net_device *dev)
2920 {
2921         struct vxlan_dev *vxlan = netdev_priv(dev);
2922
2923         return vxlan->net;
2924 }
2925
2926 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
2927         .kind           = "vxlan",
2928         .maxtype        = IFLA_VXLAN_MAX,
2929         .policy         = vxlan_policy,
2930         .priv_size      = sizeof(struct vxlan_dev),
2931         .setup          = vxlan_setup,
2932         .validate       = vxlan_validate,
2933         .newlink        = vxlan_newlink,
2934         .dellink        = vxlan_dellink,
2935         .get_size       = vxlan_get_size,
2936         .fill_info      = vxlan_fill_info,
2937         .get_link_net   = vxlan_get_link_net,
2938 };
2939
2940 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
2941                                              struct net_device *dev)
2942 {
2943         struct vxlan_dev *vxlan, *next;
2944         LIST_HEAD(list_kill);
2945
2946         list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
2947                 struct vxlan_rdst *dst = &vxlan->default_dst;
2948
2949                 /* In case we created vxlan device with carrier
2950                  * and we loose the carrier due to module unload
2951                  * we also need to remove vxlan device. In other
2952                  * cases, it's not necessary and remote_ifindex
2953                  * is 0 here, so no matches.
2954                  */
2955                 if (dst->remote_ifindex == dev->ifindex)
2956                         vxlan_dellink(vxlan->dev, &list_kill);
2957         }
2958
2959         unregister_netdevice_many(&list_kill);
2960 }
2961
2962 static int vxlan_lowerdev_event(struct notifier_block *unused,
2963                                 unsigned long event, void *ptr)
2964 {
2965         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2966         struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
2967
2968         if (event == NETDEV_UNREGISTER)
2969                 vxlan_handle_lowerdev_unregister(vn, dev);
2970
2971         return NOTIFY_DONE;
2972 }
2973
2974 static struct notifier_block vxlan_notifier_block __read_mostly = {
2975         .notifier_call = vxlan_lowerdev_event,
2976 };
2977
2978 static __net_init int vxlan_init_net(struct net *net)
2979 {
2980         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2981         unsigned int h;
2982
2983         INIT_LIST_HEAD(&vn->vxlan_list);
2984         spin_lock_init(&vn->sock_lock);
2985
2986         for (h = 0; h < PORT_HASH_SIZE; ++h)
2987                 INIT_HLIST_HEAD(&vn->sock_list[h]);
2988
2989         return 0;
2990 }
2991
2992 static void __net_exit vxlan_exit_net(struct net *net)
2993 {
2994         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2995         struct vxlan_dev *vxlan, *next;
2996         struct net_device *dev, *aux;
2997         LIST_HEAD(list);
2998
2999         rtnl_lock();
3000         for_each_netdev_safe(net, dev, aux)
3001                 if (dev->rtnl_link_ops == &vxlan_link_ops)
3002                         unregister_netdevice_queue(dev, &list);
3003
3004         list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3005                 /* If vxlan->dev is in the same netns, it has already been added
3006                  * to the list by the previous loop.
3007                  */
3008                 if (!net_eq(dev_net(vxlan->dev), net))
3009                         unregister_netdevice_queue(dev, &list);
3010         }
3011
3012         unregister_netdevice_many(&list);
3013         rtnl_unlock();
3014 }
3015
3016 static struct pernet_operations vxlan_net_ops = {
3017         .init = vxlan_init_net,
3018         .exit = vxlan_exit_net,
3019         .id   = &vxlan_net_id,
3020         .size = sizeof(struct vxlan_net),
3021 };
3022
3023 static int __init vxlan_init_module(void)
3024 {
3025         int rc;
3026
3027         vxlan_wq = alloc_workqueue("vxlan", 0, 0);
3028         if (!vxlan_wq)
3029                 return -ENOMEM;
3030
3031         get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
3032
3033         rc = register_pernet_subsys(&vxlan_net_ops);
3034         if (rc)
3035                 goto out1;
3036
3037         rc = register_netdevice_notifier(&vxlan_notifier_block);
3038         if (rc)
3039                 goto out2;
3040
3041         rc = rtnl_link_register(&vxlan_link_ops);
3042         if (rc)
3043                 goto out3;
3044
3045         return 0;
3046 out3:
3047         unregister_netdevice_notifier(&vxlan_notifier_block);
3048 out2:
3049         unregister_pernet_subsys(&vxlan_net_ops);
3050 out1:
3051         destroy_workqueue(vxlan_wq);
3052         return rc;
3053 }
3054 late_initcall(vxlan_init_module);
3055
3056 static void __exit vxlan_cleanup_module(void)
3057 {
3058         rtnl_link_unregister(&vxlan_link_ops);
3059         unregister_netdevice_notifier(&vxlan_notifier_block);
3060         destroy_workqueue(vxlan_wq);
3061         unregister_pernet_subsys(&vxlan_net_ops);
3062         /* rcu_barrier() is called by netns */
3063 }
3064 module_exit(vxlan_cleanup_module);
3065
3066 MODULE_LICENSE("GPL");
3067 MODULE_VERSION(VXLAN_VERSION);
3068 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
3069 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
3070 MODULE_ALIAS_RTNL_LINK("vxlan");