kernel/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         unsigned long     age_interval;
 131         struct timer_list age_timer;
 132         spinlock_t        hash_lock;
 133         unsigned int      addrcnt;
 134         unsigned int      addrmax;
 135
 136         struct hlist_head fdb_head[FDB_HASH_SIZE];
 137 };
 138
 139 /* salt for hash table */
 140 static u32 vxlan_salt __read_mostly;
 141 static struct workqueue_struct *vxlan_wq;
 142
 143 #if IS_ENABLED(CONFIG_IPV6)
 144 static inline
 145 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
 146 {
 147         if (a->sa.sa_family != b->sa.sa_family)
 148                 return false;
 149         if (a->sa.sa_family == AF_INET6)
 150                 return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
 151         else
 152                 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
 153 }
 154
 155 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
 156 {
 157         if (ipa->sa.sa_family == AF_INET6)
 158                 return ipv6_addr_any(&ipa->sin6.sin6_addr);
 159         else
 160                 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
 161 }
 162
 163 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
 164 {
 165         if (ipa->sa.sa_family == AF_INET6)
 166                 return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr);
 167         else
 168                 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
 169 }
 170
 171 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
 172 {
 173         if (nla_len(nla) >= sizeof(struct in6_addr)) {
 174                 ip->sin6.sin6_addr = nla_get_in6_addr(nla);
 175                 ip->sa.sa_family = AF_INET6;
 176                 return 0;
 177         } else if (nla_len(nla) >= sizeof(__be32)) {
 178                 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
 179                 ip->sa.sa_family = AF_INET;
 180                 return 0;
 181         } else {
 182                 return -EAFNOSUPPORT;
 183         }
 184 }
 185
 186 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
 187                               const union vxlan_addr *ip)
 188 {
 189         if (ip->sa.sa_family == AF_INET6)
 190                 return nla_put_in6_addr(skb, attr, &ip->sin6.sin6_addr);
 191         else
 192                 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
 193 }
 194
 195 #else /* !CONFIG_IPV6 */
 196
 197 static inline
 198 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
 199 {
 200         return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
 201 }
 202
 203 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
 204 {
 205         return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
 206 }
 207
 208 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
 209 {
 210         return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
 211 }
 212
 213 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
 214 {
 215         if (nla_len(nla) >= sizeof(struct in6_addr)) {
 216                 return -EAFNOSUPPORT;
 217         } else if (nla_len(nla) >= sizeof(__be32)) {
 218                 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
 219                 ip->sa.sa_family = AF_INET;
 220                 return 0;
 221         } else {
 222                 return -EAFNOSUPPORT;
 223         }
 224 }
 225
 226 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
 227                               const union vxlan_addr *ip)
 228 {
 229         return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
 230 }
 231 #endif
 232
 233 /* Virtual Network hash table head */
 234 static inline struct hlist_head *vni_head(struct vxlan_sock *vs, u32 id)
 235 {
 236         return &vs->vni_list[hash_32(id, VNI_HASH_BITS)];
 237 }
 238
 239 /* Socket hash table head */
 240 static inline struct hlist_head *vs_head(struct net *net, __be16 port)
 241 {
 242         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
 243
 244         return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
 245 }
 246
 247 /* First remote destination for a forwarding entry.
 248  * Guaranteed to be non-NULL because remotes are never deleted.
 249  */
 250 static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
 251 {
 252         return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
 253 }
 254
 255 static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
 256 {
 257         return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
 258 }
 259
 260 /* Find VXLAN socket based on network namespace, address family and UDP port
 261  * and enabled unshareable flags.
 262  */
 263 static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family,
 264                                           __be16 port, u32 flags)
 265 {
 266         struct vxlan_sock *vs;
 267
 268         flags &= VXLAN_F_RCV_FLAGS;
 269
 270         hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
 271                 if (inet_sk(vs->sock->sk)->inet_sport == port &&
 272                     inet_sk(vs->sock->sk)->sk.sk_family == family &&
 273                     vs->flags == flags)
 274                         return vs;
 275         }
 276         return NULL;
 277 }
 278
 279 static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, u32 id)
 280 {
 281         struct vxlan_dev *vxlan;
 282
 283         hlist_for_each_entry_rcu(vxlan, vni_head(vs, id), hlist) {
 284                 if (vxlan->default_dst.remote_vni == id)
 285                         return vxlan;
 286         }
 287
 288         return NULL;
 289 }
 290
 291 /* Look up VNI in a per net namespace table */
 292 static struct vxlan_dev *vxlan_find_vni(struct net *net, u32 id,
 293                                         sa_family_t family, __be16 port,
 294                                         u32 flags)
 295 {
 296         struct vxlan_sock *vs;
 297
 298         vs = vxlan_find_sock(net, family, port, flags);
 299         if (!vs)
 300                 return NULL;
 301
 302         return vxlan_vs_find_vni(vs, id);
 303 }
 304
 305 /* Fill in neighbour message in skbuff. */
 306 static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
 307                           const struct vxlan_fdb *fdb,
 308                           u32 portid, u32 seq, int type, unsigned int flags,
 309                           const struct vxlan_rdst *rdst)
 310 {
 311         unsigned long now = jiffies;
 312         struct nda_cacheinfo ci;
 313         struct nlmsghdr *nlh;
 314         struct ndmsg *ndm;
 315         bool send_ip, send_eth;
 316
 317         nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
 318         if (nlh == NULL)
 319                 return -EMSGSIZE;
 320
 321         ndm = nlmsg_data(nlh);
 322         memset(ndm, 0, sizeof(*ndm));
 323
 324         send_eth = send_ip = true;
 325
 326         if (type == RTM_GETNEIGH) {
 327                 ndm->ndm_family = AF_INET;
 328                 send_ip = !vxlan_addr_any(&rdst->remote_ip);
 329                 send_eth = !is_zero_ether_addr(fdb->eth_addr);
 330         } else
 331                 ndm->ndm_family = AF_BRIDGE;
 332         ndm->ndm_state = fdb->state;
 333         ndm->ndm_ifindex = vxlan->dev->ifindex;
 334         ndm->ndm_flags = fdb->flags;
 335         ndm->ndm_type = RTN_UNICAST;
 336
 337         if (!net_eq(dev_net(vxlan->dev), vxlan->net) &&
 338             nla_put_s32(skb, NDA_LINK_NETNSID,
 339                         peernet2id(dev_net(vxlan->dev), vxlan->net)))
 340                 goto nla_put_failure;
 341
 342         if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
 343                 goto nla_put_failure;
 344
 345         if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
 346                 goto nla_put_failure;
 347
 348         if (rdst->remote_port && rdst->remote_port != vxlan->dst_port &&
 349             nla_put_be16(skb, NDA_PORT, rdst->remote_port))
 350                 goto nla_put_failure;
 351         if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
 352             nla_put_u32(skb, NDA_VNI, rdst->remote_vni))
 353                 goto nla_put_failure;
 354         if (rdst->remote_ifindex &&
 355             nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
 356                 goto nla_put_failure;
 357
 358         ci.ndm_used      = jiffies_to_clock_t(now - fdb->used);
 359         ci.ndm_confirmed = 0;
 360         ci.ndm_updated   = jiffies_to_clock_t(now - fdb->updated);
 361         ci.ndm_refcnt    = 0;
 362
 363         if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
 364                 goto nla_put_failure;
 365
 366         nlmsg_end(skb, nlh);
 367         return 0;
 368
 369 nla_put_failure:
 370         nlmsg_cancel(skb, nlh);
 371         return -EMSGSIZE;
 372 }
 373
 374 static inline size_t vxlan_nlmsg_size(void)
 375 {
 376         return NLMSG_ALIGN(sizeof(struct ndmsg))
 377                 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
 378                 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
 379                 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
 380                 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
 381                 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
 382                 + nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */
 383                 + nla_total_size(sizeof(struct nda_cacheinfo));
 384 }
 385
 386 static void vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
 387                              struct vxlan_rdst *rd, int type)
 388 {
 389         struct net *net = dev_net(vxlan->dev);
 390         struct sk_buff *skb;
 391         int err = -ENOBUFS;
 392
 393         skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
 394         if (skb == NULL)
 395                 goto errout;
 396
 397         err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
 398         if (err < 0) {
 399                 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
 400                 WARN_ON(err == -EMSGSIZE);
 401                 kfree_skb(skb);
 402                 goto errout;
 403         }
 404
 405         rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
 406         return;
 407 errout:
 408         if (err < 0)
 409                 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
 410 }
 411
 412 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
 413 {
 414         struct vxlan_dev *vxlan = netdev_priv(dev);
 415         struct vxlan_fdb f = {
 416                 .state = NUD_STALE,
 417         };
 418         struct vxlan_rdst remote = {
 419                 .remote_ip = *ipa, /* goes to NDA_DST */
 420                 .remote_vni = VXLAN_N_VID,
 421         };
 422
 423         vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
 424 }
 425
 426 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
 427 {
 428         struct vxlan_fdb f = {
 429                 .state = NUD_STALE,
 430         };
 431         struct vxlan_rdst remote = { };
 432
 433         memcpy(f.eth_addr, eth_addr, ETH_ALEN);
 434
 435         vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
 436 }
 437
 438 /* Hash Ethernet address */
 439 static u32 eth_hash(const unsigned char *addr)
 440 {
 441         u64 value = get_unaligned((u64 *)addr);
 442
 443         /* only want 6 bytes */
 444 #ifdef __BIG_ENDIAN
 445         value >>= 16;
 446 #else
 447         value <<= 16;
 448 #endif
 449         return hash_64(value, FDB_HASH_BITS);
 450 }
 451
 452 /* Hash chain to use given mac address */
 453 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
 454                                                 const u8 *mac)
 455 {
 456         return &vxlan->fdb_head[eth_hash(mac)];
 457 }
 458
 459 /* Look up Ethernet address in forwarding table */
 460 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
 461                                         const u8 *mac)
 462 {
 463         struct hlist_head *head = vxlan_fdb_head(vxlan, mac);
 464         struct vxlan_fdb *f;
 465
 466         hlist_for_each_entry_rcu(f, head, hlist) {
 467                 if (ether_addr_equal(mac, f->eth_addr))
 468                         return f;
 469         }
 470
 471         return NULL;
 472 }
 473
 474 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
 475                                         const u8 *mac)
 476 {
 477         struct vxlan_fdb *f;
 478
 479         f = __vxlan_find_mac(vxlan, mac);
 480         if (f)
 481                 f->used = jiffies;
 482
 483         return f;
 484 }
 485
 486 /* caller should hold vxlan->hash_lock */
 487 static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
 488                                               union vxlan_addr *ip, __be16 port,
 489                                               __u32 vni, __u32 ifindex)
 490 {
 491         struct vxlan_rdst *rd;
 492
 493         list_for_each_entry(rd, &f->remotes, list) {
 494                 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
 495                     rd->remote_port == port &&
 496                     rd->remote_vni == vni &&
 497                     rd->remote_ifindex == ifindex)
 498                         return rd;
 499         }
 500
 501         return NULL;
 502 }
 503
 504 /* Replace destination of unicast mac */
 505 static int vxlan_fdb_replace(struct vxlan_fdb *f,
 506                              union vxlan_addr *ip, __be16 port, __u32 vni, __u32 ifindex)
 507 {
 508         struct vxlan_rdst *rd;
 509
 510         rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
 511         if (rd)
 512                 return 0;
 513
 514         rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
 515         if (!rd)
 516                 return 0;
 517         rd->remote_ip = *ip;
 518         rd->remote_port = port;
 519         rd->remote_vni = vni;
 520         rd->remote_ifindex = ifindex;
 521         return 1;
 522 }
 523
 524 /* Add/update destinations for multicast */
 525 static int vxlan_fdb_append(struct vxlan_fdb *f,
 526                             union vxlan_addr *ip, __be16 port, __u32 vni,
 527                             __u32 ifindex, struct vxlan_rdst **rdp)
 528 {
 529         struct vxlan_rdst *rd;
 530
 531         rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
 532         if (rd)
 533                 return 0;
 534
 535         rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
 536         if (rd == NULL)
 537                 return -ENOBUFS;
 538         rd->remote_ip = *ip;
 539         rd->remote_port = port;
 540         rd->remote_vni = vni;
 541         rd->remote_ifindex = ifindex;
 542
 543         list_add_tail_rcu(&rd->list, &f->remotes);
 544
 545         *rdp = rd;
 546         return 1;
 547 }
 548
 549 static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
 550                                           unsigned int off,
 551                                           struct vxlanhdr *vh, size_t hdrlen,
 552                                           u32 data, struct gro_remcsum *grc,
 553                                           bool nopartial)
 554 {
 555         size_t start, offset, plen;
 556
 557         if (skb->remcsum_offload)
 558                 return NULL;
 559
 560         if (!NAPI_GRO_CB(skb)->csum_valid)
 561                 return NULL;
 562
 563         start = (data & VXLAN_RCO_MASK) << VXLAN_RCO_SHIFT;
 564         offset = start + ((data & VXLAN_RCO_UDP) ?
 565                           offsetof(struct udphdr, check) :
 566                           offsetof(struct tcphdr, check));
 567
 568         plen = hdrlen + offset + sizeof(u16);
 569
 570         /* Pull checksum that will be written */
 571         if (skb_gro_header_hard(skb, off + plen)) {
 572                 vh = skb_gro_header_slow(skb, off + plen, off);
 573                 if (!vh)
 574                         return NULL;
 575         }
 576
 577         skb_gro_remcsum_process(skb, (void *)vh + hdrlen,
 578                                 start, offset, grc, nopartial);
 579
 580         skb->remcsum_offload = 1;
 581
 582         return vh;
 583 }
 584
 585 static struct sk_buff **vxlan_gro_receive(struct sk_buff **head,
 586                                           struct sk_buff *skb,
 587                                           struct udp_offload *uoff)
 588 {
 589         struct sk_buff *p, **pp = NULL;
 590         struct vxlanhdr *vh, *vh2;
 591         unsigned int hlen, off_vx;
 592         int flush = 1;
 593         struct vxlan_sock *vs = container_of(uoff, struct vxlan_sock,
 594                                              udp_offloads);
 595         u32 flags;
 596         struct gro_remcsum grc;
 597
 598         skb_gro_remcsum_init(&grc);
 599
 600         off_vx = skb_gro_offset(skb);
 601         hlen = off_vx + sizeof(*vh);
 602         vh   = skb_gro_header_fast(skb, off_vx);
 603         if (skb_gro_header_hard(skb, hlen)) {
 604                 vh = skb_gro_header_slow(skb, hlen, off_vx);
 605                 if (unlikely(!vh))
 606                         goto out;
 607         }
 608
 609         skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
 610         skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
 611
 612         flags = ntohl(vh->vx_flags);
 613
 614         if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
 615                 vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
 616                                        ntohl(vh->vx_vni), &grc,
 617                                        !!(vs->flags &
 618                                           VXLAN_F_REMCSUM_NOPARTIAL));
 619
 620                 if (!vh)
 621                         goto out;
 622         }
 623
 624         flush = 0;
 625
 626         for (p = *head; p; p = p->next) {
 627                 if (!NAPI_GRO_CB(p)->same_flow)
 628                         continue;
 629
 630                 vh2 = (struct vxlanhdr *)(p->data + off_vx);
 631                 if (vh->vx_flags != vh2->vx_flags ||
 632                     vh->vx_vni != vh2->vx_vni) {
 633                         NAPI_GRO_CB(p)->same_flow = 0;
 634                         continue;
 635                 }
 636         }
 637
 638         pp = eth_gro_receive(head, skb);
 639
 640 out:
 641         skb_gro_remcsum_cleanup(skb, &grc);
 642         NAPI_GRO_CB(skb)->flush |= flush;
 643
 644         return pp;
 645 }
 646
 647 static int vxlan_gro_complete(struct sk_buff *skb, int nhoff,
 648                               struct udp_offload *uoff)
 649 {
 650         udp_tunnel_gro_complete(skb, nhoff);
 651
 652         return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
 653 }
 654
 655 /* Notify netdevs that UDP port started listening */
 656 static void vxlan_notify_add_rx_port(struct vxlan_sock *vs)
 657 {
 658         struct net_device *dev;
 659         struct sock *sk = vs->sock->sk;
 660         struct net *net = sock_net(sk);
 661         sa_family_t sa_family = sk->sk_family;
 662         __be16 port = inet_sk(sk)->inet_sport;
 663         int err;
 664
 665         if (sa_family == AF_INET) {
 666                 err = udp_add_offload(&vs->udp_offloads);
 667                 if (err)
 668                         pr_warn("vxlan: udp_add_offload failed with status %d\n", err);
 669         }
 670
 671         rcu_read_lock();
 672         for_each_netdev_rcu(net, dev) {
 673                 if (dev->netdev_ops->ndo_add_vxlan_port)
 674                         dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
 675                                                             port);
 676         }
 677         rcu_read_unlock();
 678 }
 679
 680 /* Notify netdevs that UDP port is no more listening */
 681 static void vxlan_notify_del_rx_port(struct vxlan_sock *vs)
 682 {
 683         struct net_device *dev;
 684         struct sock *sk = vs->sock->sk;
 685         struct net *net = sock_net(sk);
 686         sa_family_t sa_family = sk->sk_family;
 687         __be16 port = inet_sk(sk)->inet_sport;
 688
 689         rcu_read_lock();
 690         for_each_netdev_rcu(net, dev) {
 691                 if (dev->netdev_ops->ndo_del_vxlan_port)
 692                         dev->netdev_ops->ndo_del_vxlan_port(dev, sa_family,
 693                                                             port);
 694         }
 695         rcu_read_unlock();
 696
 697         if (sa_family == AF_INET)
 698                 udp_del_offload(&vs->udp_offloads);
 699 }
 700
 701 /* Add new entry to forwarding table -- assumes lock held */
 702 static int vxlan_fdb_create(struct vxlan_dev *vxlan,
 703                             const u8 *mac, union vxlan_addr *ip,
 704                             __u16 state, __u16 flags,
 705                             __be16 port, __u32 vni, __u32 ifindex,
 706                             __u8 ndm_flags)
 707 {
 708         struct vxlan_rdst *rd = NULL;
 709         struct vxlan_fdb *f;
 710         int notify = 0;
 711
 712         f = __vxlan_find_mac(vxlan, mac);
 713         if (f) {
 714                 if (flags & NLM_F_EXCL) {
 715                         netdev_dbg(vxlan->dev,
 716                                    "lost race to create %pM\n", mac);
 717                         return -EEXIST;
 718                 }
 719                 if (f->state != state) {
 720                         f->state = state;
 721                         f->updated = jiffies;
 722                         notify = 1;
 723                 }
 724                 if (f->flags != ndm_flags) {
 725                         f->flags = ndm_flags;
 726                         f->updated = jiffies;
 727                         notify = 1;
 728                 }
 729                 if ((flags & NLM_F_REPLACE)) {
 730                         /* Only change unicasts */
 731                         if (!(is_multicast_ether_addr(f->eth_addr) ||
 732                              is_zero_ether_addr(f->eth_addr))) {
 733                                 notify |= vxlan_fdb_replace(f, ip, port, vni,
 734                                                            ifindex);
 735                         } else
 736                                 return -EOPNOTSUPP;
 737                 }
 738                 if ((flags & NLM_F_APPEND) &&
 739                     (is_multicast_ether_addr(f->eth_addr) ||
 740                      is_zero_ether_addr(f->eth_addr))) {
 741                         int rc = vxlan_fdb_append(f, ip, port, vni, ifindex,
 742                                                   &rd);
 743
 744                         if (rc < 0)
 745                                 return rc;
 746                         notify |= rc;
 747                 }
 748         } else {
 749                 if (!(flags & NLM_F_CREATE))
 750                         return -ENOENT;
 751
 752                 if (vxlan->addrmax && vxlan->addrcnt >= vxlan->addrmax)
 753                         return -ENOSPC;
 754
 755                 /* Disallow replace to add a multicast entry */
 756                 if ((flags & NLM_F_REPLACE) &&
 757                     (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
 758                         return -EOPNOTSUPP;
 759
 760                 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
 761                 f = kmalloc(sizeof(*f), GFP_ATOMIC);
 762                 if (!f)
 763                         return -ENOMEM;
 764
 765                 notify = 1;
 766                 f->state = state;
 767                 f->flags = ndm_flags;
 768                 f->updated = f->used = jiffies;
 769                 INIT_LIST_HEAD(&f->remotes);
 770                 memcpy(f->eth_addr, mac, ETH_ALEN);
 771
 772                 vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
 773
 774                 ++vxlan->addrcnt;
 775                 hlist_add_head_rcu(&f->hlist,
 776                                    vxlan_fdb_head(vxlan, mac));
 777         }
 778
 779         if (notify) {
 780                 if (rd == NULL)
 781                         rd = first_remote_rtnl(f);
 782                 vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH);
 783         }
 784
 785         return 0;
 786 }
 787
 788 static void vxlan_fdb_free(struct rcu_head *head)
 789 {
 790         struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
 791         struct vxlan_rdst *rd, *nd;
 792
 793         list_for_each_entry_safe(rd, nd, &f->remotes, list)
 794                 kfree(rd);
 795         kfree(f);
 796 }
 797
 798 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f)
 799 {
 800         netdev_dbg(vxlan->dev,
 801                     "delete %pM\n", f->eth_addr);
 802
 803         --vxlan->addrcnt;
 804         vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_DELNEIGH);
 805
 806         hlist_del_rcu(&f->hlist);
 807         call_rcu(&f->rcu, vxlan_fdb_free);
 808 }
 809
 810 static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
 811                            union vxlan_addr *ip, __be16 *port, u32 *vni, u32 *ifindex)
 812 {
 813         struct net *net = dev_net(vxlan->dev);
 814         int err;
 815
 816         if (tb[NDA_DST]) {
 817                 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
 818                 if (err)
 819                         return err;
 820         } else {
 821                 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
 822                 if (remote->sa.sa_family == AF_INET) {
 823                         ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
 824                         ip->sa.sa_family = AF_INET;
 825 #if IS_ENABLED(CONFIG_IPV6)
 826                 } else {
 827                         ip->sin6.sin6_addr = in6addr_any;
 828                         ip->sa.sa_family = AF_INET6;
 829 #endif
 830                 }
 831         }
 832
 833         if (tb[NDA_PORT]) {
 834                 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
 835                         return -EINVAL;
 836                 *port = nla_get_be16(tb[NDA_PORT]);
 837         } else {
 838                 *port = vxlan->dst_port;
 839         }
 840
 841         if (tb[NDA_VNI]) {
 842                 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
 843                         return -EINVAL;
 844                 *vni = nla_get_u32(tb[NDA_VNI]);
 845         } else {
 846                 *vni = vxlan->default_dst.remote_vni;
 847         }
 848
 849         if (tb[NDA_IFINDEX]) {
 850                 struct net_device *tdev;
 851
 852                 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
 853                         return -EINVAL;
 854                 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
 855                 tdev = __dev_get_by_index(net, *ifindex);
 856                 if (!tdev)
 857                         return -EADDRNOTAVAIL;
 858         } else {
 859                 *ifindex = 0;
 860         }
 861
 862         return 0;
 863 }
 864
 865 /* Add static entry (via netlink) */
 866 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
 867                          struct net_device *dev,
 868                          const unsigned char *addr, u16 vid, u16 flags)
 869 {
 870         struct vxlan_dev *vxlan = netdev_priv(dev);
 871         /* struct net *net = dev_net(vxlan->dev); */
 872         union vxlan_addr ip;
 873         __be16 port;
 874         u32 vni, ifindex;
 875         int err;
 876
 877         if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
 878                 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
 879                         ndm->ndm_state);
 880                 return -EINVAL;
 881         }
 882
 883         if (tb[NDA_DST] == NULL)
 884                 return -EINVAL;
 885
 886         err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
 887         if (err)
 888                 return err;
 889
 890         if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
 891                 return -EAFNOSUPPORT;
 892
 893         spin_lock_bh(&vxlan->hash_lock);
 894         err = vxlan_fdb_create(vxlan, addr, &ip, ndm->ndm_state, flags,
 895                                port, vni, ifindex, ndm->ndm_flags);
 896         spin_unlock_bh(&vxlan->hash_lock);
 897
 898         return err;
 899 }
 900
 901 /* Delete entry (via netlink) */
 902 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
 903                             struct net_device *dev,
 904                             const unsigned char *addr, u16 vid)
 905 {
 906         struct vxlan_dev *vxlan = netdev_priv(dev);
 907         struct vxlan_fdb *f;
 908         struct vxlan_rdst *rd = NULL;
 909         union vxlan_addr ip;
 910         __be16 port;
 911         u32 vni, ifindex;
 912         int err;
 913
 914         err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
 915         if (err)
 916                 return err;
 917
 918         err = -ENOENT;
 919
 920         spin_lock_bh(&vxlan->hash_lock);
 921         f = vxlan_find_mac(vxlan, addr);
 922         if (!f)
 923                 goto out;
 924
 925         if (!vxlan_addr_any(&ip)) {
 926                 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
 927                 if (!rd)
 928                         goto out;
 929         }
 930
 931         err = 0;
 932
 933         /* remove a destination if it's not the only one on the list,
 934          * otherwise destroy the fdb entry
 935          */
 936         if (rd && !list_is_singular(&f->remotes)) {
 937                 list_del_rcu(&rd->list);
 938                 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH);
 939                 kfree_rcu(rd, rcu);
 940                 goto out;
 941         }
 942
 943         vxlan_fdb_destroy(vxlan, f);
 944
 945 out:
 946         spin_unlock_bh(&vxlan->hash_lock);
 947
 948         return err;
 949 }
 950
 951 /* Dump forwarding table */
 952 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
 953                           struct net_device *dev,
 954                           struct net_device *filter_dev, int idx)
 955 {
 956         struct vxlan_dev *vxlan = netdev_priv(dev);
 957         unsigned int h;
 958
 959         for (h = 0; h < FDB_HASH_SIZE; ++h) {
 960                 struct vxlan_fdb *f;
 961                 int err;
 962
 963                 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
 964                         struct vxlan_rdst *rd;
 965
 966                         if (idx < cb->args[0])
 967                                 goto skip;
 968
 969                         list_for_each_entry_rcu(rd, &f->remotes, list) {
 970                                 err = vxlan_fdb_info(skb, vxlan, f,
 971                                                      NETLINK_CB(cb->skb).portid,
 972                                                      cb->nlh->nlmsg_seq,
 973                                                      RTM_NEWNEIGH,
 974                                                      NLM_F_MULTI, rd);
 975                                 if (err < 0)
 976                                         goto out;
 977                         }
 978 skip:
 979                         ++idx;
 980                 }
 981         }
 982 out:
 983         return idx;
 984 }
 985
 986 /* Watch incoming packets to learn mapping between Ethernet address
 987  * and Tunnel endpoint.
 988  * Return true if packet is bogus and should be dropped.
 989  */
 990 static bool vxlan_snoop(struct net_device *dev,
 991                         union vxlan_addr *src_ip, const u8 *src_mac)
 992 {
 993         struct vxlan_dev *vxlan = netdev_priv(dev);
 994         struct vxlan_fdb *f;
 995
 996         f = vxlan_find_mac(vxlan, src_mac);
 997         if (likely(f)) {
 998                 struct vxlan_rdst *rdst = first_remote_rcu(f);
 999
1000                 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip)))
1001                         return false;
1002
1003                 /* Don't migrate static entries, drop packets */
1004                 if (f->state & NUD_NOARP)
1005                         return true;
1006
1007                 if (net_ratelimit())
1008                         netdev_info(dev,
1009                                     "%pM migrated from %pIS to %pIS\n",
1010                                     src_mac, &rdst->remote_ip.sa, &src_ip->sa);
1011
1012                 rdst->remote_ip = *src_ip;
1013                 f->updated = jiffies;
1014                 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH);
1015         } else {
1016                 /* learned new entry */
1017                 spin_lock(&vxlan->hash_lock);
1018
1019                 /* close off race between vxlan_flush and incoming packets */
1020                 if (netif_running(dev))
1021                         vxlan_fdb_create(vxlan, src_mac, src_ip,
1022                                          NUD_REACHABLE,
1023                                          NLM_F_EXCL|NLM_F_CREATE,
1024                                          vxlan->dst_port,
1025                                          vxlan->default_dst.remote_vni,
1026                                          0, NTF_SELF);
1027                 spin_unlock(&vxlan->hash_lock);
1028         }
1029
1030         return false;
1031 }
1032
1033 /* See if multicast group is already in use by other ID */
1034 static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
1035 {
1036         struct vxlan_dev *vxlan;
1037
1038         /* The vxlan_sock is only used by dev, leaving group has
1039          * no effect on other vxlan devices.
1040          */
1041         if (atomic_read(&dev->vn_sock->refcnt) == 1)
1042                 return false;
1043
1044         list_for_each_entry(vxlan, &vn->vxlan_list, next) {
1045                 if (!netif_running(vxlan->dev) || vxlan == dev)
1046                         continue;
1047
1048                 if (vxlan->vn_sock != dev->vn_sock)
1049                         continue;
1050
1051                 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
1052                                       &dev->default_dst.remote_ip))
1053                         continue;
1054
1055                 if (vxlan->default_dst.remote_ifindex !=
1056                     dev->default_dst.remote_ifindex)
1057                         continue;
1058
1059                 return true;
1060         }
1061
1062         return false;
1063 }
1064
1065 void vxlan_sock_release(struct vxlan_sock *vs)
1066 {
1067         struct sock *sk = vs->sock->sk;
1068         struct net *net = sock_net(sk);
1069         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
1070
1071         if (!atomic_dec_and_test(&vs->refcnt))
1072                 return;
1073
1074         spin_lock(&vn->sock_lock);
1075         hlist_del_rcu(&vs->hlist);
1076         vxlan_notify_del_rx_port(vs);
1077         spin_unlock(&vn->sock_lock);
1078
1079         queue_work(vxlan_wq, &vs->del_work);
1080 }
1081 EXPORT_SYMBOL_GPL(vxlan_sock_release);
1082
1083 /* Update multicast group membership when first VNI on
1084  * multicast address is brought up
1085  */
1086 static int vxlan_igmp_join(struct vxlan_dev *vxlan)
1087 {
1088         struct vxlan_sock *vs = vxlan->vn_sock;
1089         struct sock *sk = vs->sock->sk;
1090         union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1091         int ifindex = vxlan->default_dst.remote_ifindex;
1092         int ret = -EINVAL;
1093
1094         lock_sock(sk);
1095         if (ip->sa.sa_family == AF_INET) {
1096                 struct ip_mreqn mreq = {
1097                         .imr_multiaddr.s_addr   = ip->sin.sin_addr.s_addr,
1098                         .imr_ifindex            = ifindex,
1099                 };
1100
1101                 ret = ip_mc_join_group(sk, &mreq);
1102 #if IS_ENABLED(CONFIG_IPV6)
1103         } else {
1104                 ret = ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1105                                                    &ip->sin6.sin6_addr);
1106 #endif
1107         }
1108         release_sock(sk);
1109
1110         return ret;
1111 }
1112
1113 /* Inverse of vxlan_igmp_join when last VNI is brought down */
1114 static int vxlan_igmp_leave(struct vxlan_dev *vxlan)
1115 {
1116         struct vxlan_sock *vs = vxlan->vn_sock;
1117         struct sock *sk = vs->sock->sk;
1118         union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1119         int ifindex = vxlan->default_dst.remote_ifindex;
1120         int ret = -EINVAL;
1121
1122         lock_sock(sk);
1123         if (ip->sa.sa_family == AF_INET) {
1124                 struct ip_mreqn mreq = {
1125                         .imr_multiaddr.s_addr   = ip->sin.sin_addr.s_addr,
1126                         .imr_ifindex            = ifindex,
1127                 };
1128
1129                 ret = ip_mc_leave_group(sk, &mreq);
1130 #if IS_ENABLED(CONFIG_IPV6)
1131         } else {
1132                 ret = ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1133                                                    &ip->sin6.sin6_addr);
1134 #endif
1135         }
1136         release_sock(sk);
1137
1138         return ret;
1139 }
1140
1141 static struct vxlanhdr *vxlan_remcsum(struct sk_buff *skb, struct vxlanhdr *vh,
1142                                       size_t hdrlen, u32 data, bool nopartial)
1143 {
1144         size_t start, offset, plen;
1145
1146         start = (data & VXLAN_RCO_MASK) << VXLAN_RCO_SHIFT;
1147         offset = start + ((data & VXLAN_RCO_UDP) ?
1148                           offsetof(struct udphdr, check) :
1149                           offsetof(struct tcphdr, check));
1150
1151         plen = hdrlen + offset + sizeof(u16);
1152
1153         if (!pskb_may_pull(skb, plen))
1154                 return NULL;
1155
1156         vh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1157
1158         skb_remcsum_process(skb, (void *)vh + hdrlen, start, offset,
1159                             nopartial);
1160
1161         return vh;
1162 }
1163
1164 /* Callback from net/ipv4/udp.c to receive packets */
1165 static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
1166 {
1167         struct vxlan_sock *vs;
1168         struct vxlanhdr *vxh;
1169         u32 flags, vni;
1170         struct vxlan_metadata md = {0};
1171
1172         /* Need Vxlan and inner Ethernet header to be present */
1173         if (!pskb_may_pull(skb, VXLAN_HLEN))
1174                 goto error;
1175
1176         vxh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1177         flags = ntohl(vxh->vx_flags);
1178         vni = ntohl(vxh->vx_vni);
1179
1180         if (flags & VXLAN_HF_VNI) {
1181                 flags &= ~VXLAN_HF_VNI;
1182         } else {
1183                 /* VNI flag always required to be set */
1184                 goto bad_flags;
1185         }
1186
1187         if (iptunnel_pull_header(skb, VXLAN_HLEN, htons(ETH_P_TEB)))
1188                 goto drop;
1189         vxh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1190
1191         vs = rcu_dereference_sk_user_data(sk);
1192         if (!vs)
1193                 goto drop;
1194
1195         if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
1196                 vxh = vxlan_remcsum(skb, vxh, sizeof(struct vxlanhdr), vni,
1197                                     !!(vs->flags & VXLAN_F_REMCSUM_NOPARTIAL));
1198                 if (!vxh)
1199                         goto drop;
1200
1201                 flags &= ~VXLAN_HF_RCO;
1202                 vni &= VXLAN_VNI_MASK;
1203         }
1204
1205         /* For backwards compatibility, only allow reserved fields to be
1206          * used by VXLAN extensions if explicitly requested.
1207          */
1208         if ((flags & VXLAN_HF_GBP) && (vs->flags & VXLAN_F_GBP)) {
1209                 struct vxlanhdr_gbp *gbp;
1210
1211                 gbp = (struct vxlanhdr_gbp *)vxh;
1212                 md.gbp = ntohs(gbp->policy_id);
1213
1214                 if (gbp->dont_learn)
1215                         md.gbp |= VXLAN_GBP_DONT_LEARN;
1216
1217                 if (gbp->policy_applied)
1218                         md.gbp |= VXLAN_GBP_POLICY_APPLIED;
1219
1220                 flags &= ~VXLAN_GBP_USED_BITS;
1221         }
1222
1223         if (flags || vni & ~VXLAN_VNI_MASK) {
1224                 /* If there are any unprocessed flags remaining treat
1225                  * this as a malformed packet. This behavior diverges from
1226                  * VXLAN RFC (RFC7348) which stipulates that bits in reserved
1227                  * in reserved fields are to be ignored. The approach here
1228                  * maintains compatibility with previous stack code, and also
1229                  * is more robust and provides a little more security in
1230                  * adding extensions to VXLAN.
1231                  */
1232
1233                 goto bad_flags;
1234         }
1235
1236         md.vni = vxh->vx_vni;
1237         vs->rcv(vs, skb, &md);
1238         return 0;
1239
1240 drop:
1241         /* Consume bad packet */
1242         kfree_skb(skb);
1243         return 0;
1244
1245 bad_flags:
1246         netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1247                    ntohl(vxh->vx_flags), ntohl(vxh->vx_vni));
1248
1249 error:
1250         /* Return non vxlan pkt */
1251         return 1;
1252 }
1253
1254 static void vxlan_rcv(struct vxlan_sock *vs, struct sk_buff *skb,
1255                       struct vxlan_metadata *md)
1256 {
1257         struct iphdr *oip = NULL;
1258         struct ipv6hdr *oip6 = NULL;
1259         struct vxlan_dev *vxlan;
1260         struct pcpu_sw_netstats *stats;
1261         union vxlan_addr saddr;
1262         __u32 vni;
1263         int err = 0;
1264         union vxlan_addr *remote_ip;
1265
1266         vni = ntohl(md->vni) >> 8;
1267         /* Is this VNI defined? */
1268         vxlan = vxlan_vs_find_vni(vs, vni);
1269         if (!vxlan)
1270                 goto drop;
1271
1272         remote_ip = &vxlan->default_dst.remote_ip;
1273         skb_reset_mac_header(skb);
1274         skb_scrub_packet(skb, !net_eq(vxlan->net, dev_net(vxlan->dev)));
1275         skb->protocol = eth_type_trans(skb, vxlan->dev);
1276         skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1277
1278         /* Ignore packet loops (and multicast echo) */
1279         if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1280                 goto drop;
1281
1282         /* Re-examine inner Ethernet packet */
1283         if (remote_ip->sa.sa_family == AF_INET) {
1284                 oip = ip_hdr(skb);
1285                 saddr.sin.sin_addr.s_addr = oip->saddr;
1286                 saddr.sa.sa_family = AF_INET;
1287 #if IS_ENABLED(CONFIG_IPV6)
1288         } else {
1289                 oip6 = ipv6_hdr(skb);
1290                 saddr.sin6.sin6_addr = oip6->saddr;
1291                 saddr.sa.sa_family = AF_INET6;
1292 #endif
1293         }
1294
1295         if ((vxlan->flags & VXLAN_F_LEARN) &&
1296             vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source))
1297                 goto drop;
1298
1299         skb_reset_network_header(skb);
1300         skb->mark = md->gbp;
1301
1302         if (oip6)
1303                 err = IP6_ECN_decapsulate(oip6, skb);
1304         if (oip)
1305                 err = IP_ECN_decapsulate(oip, skb);
1306
1307         if (unlikely(err)) {
1308                 if (log_ecn_error) {
1309                         if (oip6)
1310                                 net_info_ratelimited("non-ECT from %pI6\n",
1311                                                      &oip6->saddr);
1312                         if (oip)
1313                                 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1314                                                      &oip->saddr, oip->tos);
1315                 }
1316                 if (err > 1) {
1317                         ++vxlan->dev->stats.rx_frame_errors;
1318                         ++vxlan->dev->stats.rx_errors;
1319                         goto drop;
1320                 }
1321         }
1322
1323         stats = this_cpu_ptr(vxlan->dev->tstats);
1324         u64_stats_update_begin(&stats->syncp);
1325         stats->rx_packets++;
1326         stats->rx_bytes += skb->len;
1327         u64_stats_update_end(&stats->syncp);
1328
1329         netif_rx(skb);
1330
1331         return;
1332 drop:
1333         /* Consume bad packet */
1334         kfree_skb(skb);
1335 }
1336
1337 static int arp_reduce(struct net_device *dev, struct sk_buff *skb)
1338 {
1339         struct vxlan_dev *vxlan = netdev_priv(dev);
1340         struct arphdr *parp;
1341         u8 *arpptr, *sha;
1342         __be32 sip, tip;
1343         struct neighbour *n;
1344
1345         if (dev->flags & IFF_NOARP)
1346                 goto out;
1347
1348         if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1349                 dev->stats.tx_dropped++;
1350                 goto out;
1351         }
1352         parp = arp_hdr(skb);
1353
1354         if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1355              parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1356             parp->ar_pro != htons(ETH_P_IP) ||
1357             parp->ar_op != htons(ARPOP_REQUEST) ||
1358             parp->ar_hln != dev->addr_len ||
1359             parp->ar_pln != 4)
1360                 goto out;
1361         arpptr = (u8 *)parp + sizeof(struct arphdr);
1362         sha = arpptr;
1363         arpptr += dev->addr_len;        /* sha */
1364         memcpy(&sip, arpptr, sizeof(sip));
1365         arpptr += sizeof(sip);
1366         arpptr += dev->addr_len;        /* tha */
1367         memcpy(&tip, arpptr, sizeof(tip));
1368
1369         if (ipv4_is_loopback(tip) ||
1370             ipv4_is_multicast(tip))
1371                 goto out;
1372
1373         n = neigh_lookup(&arp_tbl, &tip, dev);
1374
1375         if (n) {
1376                 struct vxlan_fdb *f;
1377                 struct sk_buff  *reply;
1378
1379                 if (!(n->nud_state & NUD_CONNECTED)) {
1380                         neigh_release(n);
1381                         goto out;
1382                 }
1383
1384                 f = vxlan_find_mac(vxlan, n->ha);
1385                 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1386                         /* bridge-local neighbor */
1387                         neigh_release(n);
1388                         goto out;
1389                 }
1390
1391                 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1392                                 n->ha, sha);
1393
1394                 neigh_release(n);
1395
1396                 if (reply == NULL)
1397                         goto out;
1398
1399                 skb_reset_mac_header(reply);
1400                 __skb_pull(reply, skb_network_offset(reply));
1401                 reply->ip_summed = CHECKSUM_UNNECESSARY;
1402                 reply->pkt_type = PACKET_HOST;
1403
1404                 if (netif_rx_ni(reply) == NET_RX_DROP)
1405                         dev->stats.rx_dropped++;
1406         } else if (vxlan->flags & VXLAN_F_L3MISS) {
1407                 union vxlan_addr ipa = {
1408                         .sin.sin_addr.s_addr = tip,
1409                         .sin.sin_family = AF_INET,
1410                 };
1411
1412                 vxlan_ip_miss(dev, &ipa);
1413         }
1414 out:
1415         consume_skb(skb);
1416         return NETDEV_TX_OK;
1417 }
1418
1419 #if IS_ENABLED(CONFIG_IPV6)
1420 static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1421         struct neighbour *n, bool isrouter)
1422 {
1423         struct net_device *dev = request->dev;
1424         struct sk_buff *reply;
1425         struct nd_msg *ns, *na;
1426         struct ipv6hdr *pip6;
1427         u8 *daddr;
1428         int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1429         int ns_olen;
1430         int i, len;
1431
1432         if (dev == NULL)
1433                 return NULL;
1434
1435         len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1436                 sizeof(*na) + na_olen + dev->needed_tailroom;
1437         reply = alloc_skb(len, GFP_ATOMIC);
1438         if (reply == NULL)
1439                 return NULL;
1440
1441         reply->protocol = htons(ETH_P_IPV6);
1442         reply->dev = dev;
1443         skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1444         skb_push(reply, sizeof(struct ethhdr));
1445         skb_set_mac_header(reply, 0);
1446
1447         ns = (struct nd_msg *)skb_transport_header(request);
1448
1449         daddr = eth_hdr(request)->h_source;
1450         ns_olen = request->len - skb_transport_offset(request) - sizeof(*ns);
1451         for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1452                 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1453                         daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1454                         break;
1455                 }
1456         }
1457
1458         /* Ethernet header */
1459         ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1460         ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1461         eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1462         reply->protocol = htons(ETH_P_IPV6);
1463
1464         skb_pull(reply, sizeof(struct ethhdr));
1465         skb_set_network_header(reply, 0);
1466         skb_put(reply, sizeof(struct ipv6hdr));
1467
1468         /* IPv6 header */
1469
1470         pip6 = ipv6_hdr(reply);
1471         memset(pip6, 0, sizeof(struct ipv6hdr));
1472         pip6->version = 6;
1473         pip6->priority = ipv6_hdr(request)->priority;
1474         pip6->nexthdr = IPPROTO_ICMPV6;
1475         pip6->hop_limit = 255;
1476         pip6->daddr = ipv6_hdr(request)->saddr;
1477         pip6->saddr = *(struct in6_addr *)n->primary_key;
1478
1479         skb_pull(reply, sizeof(struct ipv6hdr));
1480         skb_set_transport_header(reply, 0);
1481
1482         na = (struct nd_msg *)skb_put(reply, sizeof(*na) + na_olen);
1483
1484         /* Neighbor Advertisement */
1485         memset(na, 0, sizeof(*na)+na_olen);
1486         na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1487         na->icmph.icmp6_router = isrouter;
1488         na->icmph.icmp6_override = 1;
1489         na->icmph.icmp6_solicited = 1;
1490         na->target = ns->target;
1491         ether_addr_copy(&na->opt[2], n->ha);
1492         na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1493         na->opt[1] = na_olen >> 3;
1494
1495         na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1496                 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1497                 csum_partial(na, sizeof(*na)+na_olen, 0));
1498
1499         pip6->payload_len = htons(sizeof(*na)+na_olen);
1500
1501         skb_push(reply, sizeof(struct ipv6hdr));
1502
1503         reply->ip_summed = CHECKSUM_UNNECESSARY;
1504
1505         return reply;
1506 }
1507
1508 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb)
1509 {
1510         struct vxlan_dev *vxlan = netdev_priv(dev);
1511         struct nd_msg *msg;
1512         const struct ipv6hdr *iphdr;
1513         const struct in6_addr *saddr, *daddr;
1514         struct neighbour *n;
1515         struct inet6_dev *in6_dev;
1516
1517         in6_dev = __in6_dev_get(dev);
1518         if (!in6_dev)
1519                 goto out;
1520
1521         iphdr = ipv6_hdr(skb);
1522         saddr = &iphdr->saddr;
1523         daddr = &iphdr->daddr;
1524
1525         msg = (struct nd_msg *)skb_transport_header(skb);
1526         if (msg->icmph.icmp6_code != 0 ||
1527             msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION)
1528                 goto out;
1529
1530         if (ipv6_addr_loopback(daddr) ||
1531             ipv6_addr_is_multicast(&msg->target))
1532                 goto out;
1533
1534         n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
1535
1536         if (n) {
1537                 struct vxlan_fdb *f;
1538                 struct sk_buff *reply;
1539
1540                 if (!(n->nud_state & NUD_CONNECTED)) {
1541                         neigh_release(n);
1542                         goto out;
1543                 }
1544
1545                 f = vxlan_find_mac(vxlan, n->ha);
1546                 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1547                         /* bridge-local neighbor */
1548                         neigh_release(n);
1549                         goto out;
1550                 }
1551
1552                 reply = vxlan_na_create(skb, n,
1553                                         !!(f ? f->flags & NTF_ROUTER : 0));
1554
1555                 neigh_release(n);
1556
1557                 if (reply == NULL)
1558                         goto out;
1559
1560                 if (netif_rx_ni(reply) == NET_RX_DROP)
1561                         dev->stats.rx_dropped++;
1562
1563         } else if (vxlan->flags & VXLAN_F_L3MISS) {
1564                 union vxlan_addr ipa = {
1565                         .sin6.sin6_addr = msg->target,
1566                         .sin6.sin6_family = AF_INET6,
1567                 };
1568
1569                 vxlan_ip_miss(dev, &ipa);
1570         }
1571
1572 out:
1573         consume_skb(skb);
1574         return NETDEV_TX_OK;
1575 }
1576 #endif
1577
1578 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
1579 {
1580         struct vxlan_dev *vxlan = netdev_priv(dev);
1581         struct neighbour *n;
1582
1583         if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
1584                 return false;
1585
1586         n = NULL;
1587         switch (ntohs(eth_hdr(skb)->h_proto)) {
1588         case ETH_P_IP:
1589         {
1590                 struct iphdr *pip;
1591
1592                 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1593                         return false;
1594                 pip = ip_hdr(skb);
1595                 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
1596                 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1597                         union vxlan_addr ipa = {
1598                                 .sin.sin_addr.s_addr = pip->daddr,
1599                                 .sin.sin_family = AF_INET,
1600                         };
1601
1602                         vxlan_ip_miss(dev, &ipa);
1603                         return false;
1604                 }
1605
1606                 break;
1607         }
1608 #if IS_ENABLED(CONFIG_IPV6)
1609         case ETH_P_IPV6:
1610         {
1611                 struct ipv6hdr *pip6;
1612
1613                 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
1614                         return false;
1615                 pip6 = ipv6_hdr(skb);
1616                 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
1617                 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1618                         union vxlan_addr ipa = {
1619                                 .sin6.sin6_addr = pip6->daddr,
1620                                 .sin6.sin6_family = AF_INET6,
1621                         };
1622
1623                         vxlan_ip_miss(dev, &ipa);
1624                         return false;
1625                 }
1626
1627                 break;
1628         }
1629 #endif
1630         default:
1631                 return false;
1632         }
1633
1634         if (n) {
1635                 bool diff;
1636
1637                 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
1638                 if (diff) {
1639                         memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
1640                                 dev->addr_len);
1641                         memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
1642                 }
1643                 neigh_release(n);
1644                 return diff;
1645         }
1646
1647         return false;
1648 }
1649
1650 static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
1651                                 struct vxlan_metadata *md)
1652 {
1653         struct vxlanhdr_gbp *gbp;
1654
1655         if (!md->gbp)
1656                 return;
1657
1658         gbp = (struct vxlanhdr_gbp *)vxh;
1659         vxh->vx_flags |= htonl(VXLAN_HF_GBP);
1660
1661         if (md->gbp & VXLAN_GBP_DONT_LEARN)
1662                 gbp->dont_learn = 1;
1663
1664         if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
1665                 gbp->policy_applied = 1;
1666
1667         gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
1668 }
1669
1670 #if IS_ENABLED(CONFIG_IPV6)
1671 static int vxlan6_xmit_skb(struct dst_entry *dst, struct sock *sk,
1672                            struct sk_buff *skb,
1673                            struct net_device *dev, struct in6_addr *saddr,
1674                            struct in6_addr *daddr, __u8 prio, __u8 ttl,
1675                            __be16 src_port, __be16 dst_port,
1676                            struct vxlan_metadata *md, bool xnet, u32 vxflags)
1677 {
1678         struct vxlanhdr *vxh;
1679         int min_headroom;
1680         int err;
1681         bool udp_sum = !(vxflags & VXLAN_F_UDP_ZERO_CSUM6_TX);
1682         int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1683         u16 hdrlen = sizeof(struct vxlanhdr);
1684
1685         if ((vxflags & VXLAN_F_REMCSUM_TX) &&
1686             skb->ip_summed == CHECKSUM_PARTIAL) {
1687                 int csum_start = skb_checksum_start_offset(skb);
1688
1689                 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1690                     !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1691                     (skb->csum_offset == offsetof(struct udphdr, check) ||
1692                      skb->csum_offset == offsetof(struct tcphdr, check))) {
1693                         udp_sum = false;
1694                         type |= SKB_GSO_TUNNEL_REMCSUM;
1695                 }
1696         }
1697
1698         skb_scrub_packet(skb, xnet);
1699
1700         min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
1701                         + VXLAN_HLEN + sizeof(struct ipv6hdr)
1702                         + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
1703
1704         /* Need space for new headers (invalidates iph ptr) */
1705         err = skb_cow_head(skb, min_headroom);
1706         if (unlikely(err)) {
1707                 kfree_skb(skb);
1708                 goto err;
1709         }
1710
1711         skb = vlan_hwaccel_push_inside(skb);
1712         if (WARN_ON(!skb)) {
1713                 err = -ENOMEM;
1714                 goto err;
1715         }
1716
1717         skb = iptunnel_handle_offloads(skb, udp_sum, type);
1718         if (IS_ERR(skb)) {
1719                 err = -EINVAL;
1720                 goto err;
1721         }
1722
1723         vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1724         vxh->vx_flags = htonl(VXLAN_HF_VNI);
1725         vxh->vx_vni = md->vni;
1726
1727         if (type & SKB_GSO_TUNNEL_REMCSUM) {
1728                 u32 data = (skb_checksum_start_offset(skb) - hdrlen) >>
1729                            VXLAN_RCO_SHIFT;
1730
1731                 if (skb->csum_offset == offsetof(struct udphdr, check))
1732                         data |= VXLAN_RCO_UDP;
1733
1734                 vxh->vx_vni |= htonl(data);
1735                 vxh->vx_flags |= htonl(VXLAN_HF_RCO);
1736
1737                 if (!skb_is_gso(skb)) {
1738                         skb->ip_summed = CHECKSUM_NONE;
1739                         skb->encapsulation = 0;
1740                 }
1741         }
1742
1743         if (vxflags & VXLAN_F_GBP)
1744                 vxlan_build_gbp_hdr(vxh, vxflags, md);
1745
1746         skb_set_inner_protocol(skb, htons(ETH_P_TEB));
1747
1748         udp_tunnel6_xmit_skb(dst, sk, skb, dev, saddr, daddr, prio,
1749                              ttl, src_port, dst_port,
1750                              !!(vxflags & VXLAN_F_UDP_ZERO_CSUM6_TX));
1751         return 0;
1752 err:
1753         dst_release(dst);
1754         return err;
1755 }
1756 #endif
1757
1758 int vxlan_xmit_skb(struct rtable *rt, struct sock *sk, struct sk_buff *skb,
1759                    __be32 src, __be32 dst, __u8 tos, __u8 ttl, __be16 df,
1760                    __be16 src_port, __be16 dst_port,
1761                    struct vxlan_metadata *md, bool xnet, u32 vxflags)
1762 {
1763         struct vxlanhdr *vxh;
1764         int min_headroom;
1765         int err;
1766         bool udp_sum = !!(vxflags & VXLAN_F_UDP_CSUM);
1767         int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1768         u16 hdrlen = sizeof(struct vxlanhdr);
1769
1770         if ((vxflags & VXLAN_F_REMCSUM_TX) &&
1771             skb->ip_summed == CHECKSUM_PARTIAL) {
1772                 int csum_start = skb_checksum_start_offset(skb);
1773
1774                 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1775                     !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1776                     (skb->csum_offset == offsetof(struct udphdr, check) ||
1777                      skb->csum_offset == offsetof(struct tcphdr, check))) {
1778                         udp_sum = false;
1779                         type |= SKB_GSO_TUNNEL_REMCSUM;
1780                 }
1781         }
1782
1783         min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
1784                         + VXLAN_HLEN + sizeof(struct iphdr)
1785                         + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
1786
1787         /* Need space for new headers (invalidates iph ptr) */
1788         err = skb_cow_head(skb, min_headroom);
1789         if (unlikely(err)) {
1790                 kfree_skb(skb);
1791                 return err;
1792         }
1793
1794         skb = vlan_hwaccel_push_inside(skb);
1795         if (WARN_ON(!skb))
1796                 return -ENOMEM;
1797
1798         skb = iptunnel_handle_offloads(skb, udp_sum, type);
1799         if (IS_ERR(skb))
1800                 return PTR_ERR(skb);
1801
1802         vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1803         vxh->vx_flags = htonl(VXLAN_HF_VNI);
1804         vxh->vx_vni = md->vni;
1805
1806         if (type & SKB_GSO_TUNNEL_REMCSUM) {
1807                 u32 data = (skb_checksum_start_offset(skb) - hdrlen) >>
1808                            VXLAN_RCO_SHIFT;
1809
1810                 if (skb->csum_offset == offsetof(struct udphdr, check))
1811                         data |= VXLAN_RCO_UDP;
1812
1813                 vxh->vx_vni |= htonl(data);
1814                 vxh->vx_flags |= htonl(VXLAN_HF_RCO);
1815
1816                 if (!skb_is_gso(skb)) {
1817                         skb->ip_summed = CHECKSUM_NONE;
1818                         skb->encapsulation = 0;
1819                 }
1820         }
1821
1822         if (vxflags & VXLAN_F_GBP)
1823                 vxlan_build_gbp_hdr(vxh, vxflags, md);
1824
1825         skb_set_inner_protocol(skb, htons(ETH_P_TEB));
1826
1827         return udp_tunnel_xmit_skb(rt, sk, skb, src, dst, tos,
1828                                    ttl, df, src_port, dst_port, xnet,
1829                                    !(vxflags & VXLAN_F_UDP_CSUM));
1830 }
1831 EXPORT_SYMBOL_GPL(vxlan_xmit_skb);
1832
1833 /* Bypass encapsulation if the destination is local */
1834 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
1835                                struct vxlan_dev *dst_vxlan)
1836 {
1837         struct pcpu_sw_netstats *tx_stats, *rx_stats;
1838         union vxlan_addr loopback;
1839         union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
1840         struct net_device *dev = skb->dev;
1841         int len = skb->len;
1842
1843         tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
1844         rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
1845         skb->pkt_type = PACKET_HOST;
1846         skb->encapsulation = 0;
1847         skb->dev = dst_vxlan->dev;
1848         __skb_pull(skb, skb_network_offset(skb));
1849
1850         if (remote_ip->sa.sa_family == AF_INET) {
1851                 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
1852                 loopback.sa.sa_family =  AF_INET;
1853 #if IS_ENABLED(CONFIG_IPV6)
1854         } else {
1855                 loopback.sin6.sin6_addr = in6addr_loopback;
1856                 loopback.sa.sa_family =  AF_INET6;
1857 #endif
1858         }
1859
1860         if (dst_vxlan->flags & VXLAN_F_LEARN)
1861                 vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source);
1862
1863         u64_stats_update_begin(&tx_stats->syncp);
1864         tx_stats->tx_packets++;
1865         tx_stats->tx_bytes += len;
1866         u64_stats_update_end(&tx_stats->syncp);
1867
1868         if (netif_rx(skb) == NET_RX_SUCCESS) {
1869                 u64_stats_update_begin(&rx_stats->syncp);
1870                 rx_stats->rx_packets++;
1871                 rx_stats->rx_bytes += len;
1872                 u64_stats_update_end(&rx_stats->syncp);
1873         } else {
1874                 dev->stats.rx_dropped++;
1875         }
1876 }
1877
1878 static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
1879                            struct vxlan_rdst *rdst, bool did_rsc)
1880 {
1881         struct vxlan_dev *vxlan = netdev_priv(dev);
1882         struct sock *sk = vxlan->vn_sock->sock->sk;
1883         struct rtable *rt = NULL;
1884         const struct iphdr *old_iph;
1885         struct flowi4 fl4;
1886         union vxlan_addr *dst;
1887         struct vxlan_metadata md;
1888         __be16 src_port = 0, dst_port;
1889         u32 vni;
1890         __be16 df = 0;
1891         __u8 tos, ttl;
1892         int err;
1893
1894         dst_port = rdst->remote_port ? rdst->remote_port : vxlan->dst_port;
1895         vni = rdst->remote_vni;
1896         dst = &rdst->remote_ip;
1897
1898         if (vxlan_addr_any(dst)) {
1899                 if (did_rsc) {
1900                         /* short-circuited back to local bridge */
1901                         vxlan_encap_bypass(skb, vxlan, vxlan);
1902                         return;
1903                 }
1904                 goto drop;
1905         }
1906
1907         old_iph = ip_hdr(skb);
1908
1909         ttl = vxlan->ttl;
1910         if (!ttl && vxlan_addr_multicast(dst))
1911                 ttl = 1;
1912
1913         tos = vxlan->tos;
1914         if (tos == 1)
1915                 tos = ip_tunnel_get_dsfield(old_iph, skb);
1916
1917         src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->port_min,
1918                                      vxlan->port_max, true);
1919
1920         if (dst->sa.sa_family == AF_INET) {
1921                 memset(&fl4, 0, sizeof(fl4));
1922                 fl4.flowi4_oif = rdst->remote_ifindex;
1923                 fl4.flowi4_tos = RT_TOS(tos);
1924                 fl4.daddr = dst->sin.sin_addr.s_addr;
1925                 fl4.saddr = vxlan->saddr.sin.sin_addr.s_addr;
1926
1927                 rt = ip_route_output_key(vxlan->net, &fl4);
1928                 if (IS_ERR(rt)) {
1929                         netdev_dbg(dev, "no route to %pI4\n",
1930                                    &dst->sin.sin_addr.s_addr);
1931                         dev->stats.tx_carrier_errors++;
1932                         goto tx_error;
1933                 }
1934
1935                 if (rt->dst.dev == dev) {
1936                         netdev_dbg(dev, "circular route to %pI4\n",
1937                                    &dst->sin.sin_addr.s_addr);
1938                         dev->stats.collisions++;
1939                         goto rt_tx_error;
1940                 }
1941
1942                 /* Bypass encapsulation if the destination is local */
1943                 if (rt->rt_flags & RTCF_LOCAL &&
1944                     !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
1945                         struct vxlan_dev *dst_vxlan;
1946
1947                         ip_rt_put(rt);
1948                         dst_vxlan = vxlan_find_vni(vxlan->net, vni,
1949                                                    dst->sa.sa_family, dst_port,
1950                                                    vxlan->flags);
1951                         if (!dst_vxlan)
1952                                 goto tx_error;
1953                         vxlan_encap_bypass(skb, vxlan, dst_vxlan);
1954                         return;
1955                 }
1956
1957                 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
1958                 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
1959                 md.vni = htonl(vni << 8);
1960                 md.gbp = skb->mark;
1961
1962                 err = vxlan_xmit_skb(rt, sk, skb, fl4.saddr,
1963                                      dst->sin.sin_addr.s_addr, tos, ttl, df,
1964                                      src_port, dst_port, &md,
1965                                      !net_eq(vxlan->net, dev_net(vxlan->dev)),
1966                                      vxlan->flags);
1967                 if (err < 0) {
1968                         /* skb is already freed. */
1969                         skb = NULL;
1970                         goto rt_tx_error;
1971                 }
1972
1973                 iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
1974 #if IS_ENABLED(CONFIG_IPV6)
1975         } else {
1976                 struct dst_entry *ndst;
1977                 struct flowi6 fl6;
1978                 u32 flags;
1979
1980                 memset(&fl6, 0, sizeof(fl6));
1981                 fl6.flowi6_oif = rdst->remote_ifindex;
1982                 fl6.daddr = dst->sin6.sin6_addr;
1983                 fl6.saddr = vxlan->saddr.sin6.sin6_addr;
1984                 fl6.flowi6_proto = IPPROTO_UDP;
1985
1986                 if (ipv6_stub->ipv6_dst_lookup(sk, &ndst, &fl6)) {
1987                         netdev_dbg(dev, "no route to %pI6\n",
1988                                    &dst->sin6.sin6_addr);
1989                         dev->stats.tx_carrier_errors++;
1990                         goto tx_error;
1991                 }
1992
1993                 if (ndst->dev == dev) {
1994                         netdev_dbg(dev, "circular route to %pI6\n",
1995                                    &dst->sin6.sin6_addr);
1996                         dst_release(ndst);
1997                         dev->stats.collisions++;
1998                         goto tx_error;
1999                 }
2000
2001                 /* Bypass encapsulation if the destination is local */
2002                 flags = ((struct rt6_info *)ndst)->rt6i_flags;
2003                 if (flags & RTF_LOCAL &&
2004                     !(flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2005                         struct vxlan_dev *dst_vxlan;
2006
2007                         dst_release(ndst);
2008                         dst_vxlan = vxlan_find_vni(vxlan->net, vni,
2009                                                    dst->sa.sa_family, dst_port,
2010                                                    vxlan->flags);
2011                         if (!dst_vxlan)
2012                                 goto tx_error;
2013                         vxlan_encap_bypass(skb, vxlan, dst_vxlan);
2014                         return;
2015                 }
2016
2017                 ttl = ttl ? : ip6_dst_hoplimit(ndst);
2018                 md.vni = htonl(vni << 8);
2019                 md.gbp = skb->mark;
2020
2021                 err = vxlan6_xmit_skb(ndst, sk, skb, dev, &fl6.saddr, &fl6.daddr,
2022                                       0, ttl, src_port, dst_port, &md,
2023                                       !net_eq(vxlan->net, dev_net(vxlan->dev)),
2024                                       vxlan->flags);
2025 #endif
2026         }
2027
2028         return;
2029
2030 drop:
2031         dev->stats.tx_dropped++;
2032         goto tx_free;
2033
2034 rt_tx_error:
2035         ip_rt_put(rt);
2036 tx_error:
2037         dev->stats.tx_errors++;
2038 tx_free:
2039         dev_kfree_skb(skb);
2040 }
2041
2042 /* Transmit local packets over Vxlan
2043  *
2044  * Outer IP header inherits ECN and DF from inner header.
2045  * Outer UDP destination is the VXLAN assigned port.
2046  *           source port is based on hash of flow
2047  */
2048 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
2049 {
2050         struct vxlan_dev *vxlan = netdev_priv(dev);
2051         struct ethhdr *eth;
2052         bool did_rsc = false;
2053         struct vxlan_rdst *rdst, *fdst = NULL;
2054         struct vxlan_fdb *f;
2055
2056         skb_reset_mac_header(skb);
2057         eth = eth_hdr(skb);
2058
2059         if ((vxlan->flags & VXLAN_F_PROXY)) {
2060                 if (ntohs(eth->h_proto) == ETH_P_ARP)
2061                         return arp_reduce(dev, skb);
2062 #if IS_ENABLED(CONFIG_IPV6)
2063                 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
2064                          pskb_may_pull(skb, sizeof(struct ipv6hdr)
2065                                        + sizeof(struct nd_msg)) &&
2066                          ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
2067                                 struct nd_msg *msg;
2068
2069                                 msg = (struct nd_msg *)skb_transport_header(skb);
2070                                 if (msg->icmph.icmp6_code == 0 &&
2071                                     msg->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
2072                                         return neigh_reduce(dev, skb);
2073                 }
2074                 eth = eth_hdr(skb);
2075 #endif
2076         }
2077
2078         f = vxlan_find_mac(vxlan, eth->h_dest);
2079         did_rsc = false;
2080
2081         if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) &&
2082             (ntohs(eth->h_proto) == ETH_P_IP ||
2083              ntohs(eth->h_proto) == ETH_P_IPV6)) {
2084                 did_rsc = route_shortcircuit(dev, skb);
2085                 if (did_rsc)
2086                         f = vxlan_find_mac(vxlan, eth->h_dest);
2087         }
2088
2089         if (f == NULL) {
2090                 f = vxlan_find_mac(vxlan, all_zeros_mac);
2091                 if (f == NULL) {
2092                         if ((vxlan->flags & VXLAN_F_L2MISS) &&
2093                             !is_multicast_ether_addr(eth->h_dest))
2094                                 vxlan_fdb_miss(vxlan, eth->h_dest);
2095
2096                         dev->stats.tx_dropped++;
2097                         kfree_skb(skb);
2098                         return NETDEV_TX_OK;
2099                 }
2100         }
2101
2102         list_for_each_entry_rcu(rdst, &f->remotes, list) {
2103                 struct sk_buff *skb1;
2104
2105                 if (!fdst) {
2106                         fdst = rdst;
2107                         continue;
2108                 }
2109                 skb1 = skb_clone(skb, GFP_ATOMIC);
2110                 if (skb1)
2111                         vxlan_xmit_one(skb1, dev, rdst, did_rsc);
2112         }
2113
2114         if (fdst)
2115                 vxlan_xmit_one(skb, dev, fdst, did_rsc);
2116         else
2117                 kfree_skb(skb);
2118         return NETDEV_TX_OK;
2119 }
2120
2121 /* Walk the forwarding table and purge stale entries */
2122 static void vxlan_cleanup(unsigned long arg)
2123 {
2124         struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
2125         unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2126         unsigned int h;
2127
2128         if (!netif_running(vxlan->dev))
2129                 return;
2130
2131         spin_lock_bh(&vxlan->hash_lock);
2132         for (h = 0; h < FDB_HASH_SIZE; ++h) {
2133                 struct hlist_node *p, *n;
2134                 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2135                         struct vxlan_fdb *f
2136                                 = container_of(p, struct vxlan_fdb, hlist);
2137                         unsigned long timeout;
2138
2139                         if (f->state & NUD_PERMANENT)
2140                                 continue;
2141
2142                         timeout = f->used + vxlan->age_interval * HZ;
2143                         if (time_before_eq(timeout, jiffies)) {
2144                                 netdev_dbg(vxlan->dev,
2145                                            "garbage collect %pM\n",
2146                                            f->eth_addr);
2147                                 f->state = NUD_STALE;
2148                                 vxlan_fdb_destroy(vxlan, f);
2149                         } else if (time_before(timeout, next_timer))
2150                                 next_timer = timeout;
2151                 }
2152         }
2153         spin_unlock_bh(&vxlan->hash_lock);
2154
2155         mod_timer(&vxlan->age_timer, next_timer);
2156 }
2157
2158 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan)
2159 {
2160         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2161         __u32 vni = vxlan->default_dst.remote_vni;
2162
2163         vxlan->vn_sock = vs;
2164         spin_lock(&vn->sock_lock);
2165         hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
2166         spin_unlock(&vn->sock_lock);
2167 }
2168
2169 /* Setup stats when device is created */
2170 static int vxlan_init(struct net_device *dev)
2171 {
2172         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2173         if (!dev->tstats)
2174                 return -ENOMEM;
2175
2176         return 0;
2177 }
2178
2179 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan)
2180 {
2181         struct vxlan_fdb *f;
2182
2183         spin_lock_bh(&vxlan->hash_lock);
2184         f = __vxlan_find_mac(vxlan, all_zeros_mac);
2185         if (f)
2186                 vxlan_fdb_destroy(vxlan, f);
2187         spin_unlock_bh(&vxlan->hash_lock);
2188 }
2189
2190 static void vxlan_uninit(struct net_device *dev)
2191 {
2192         struct vxlan_dev *vxlan = netdev_priv(dev);
2193
2194         vxlan_fdb_delete_default(vxlan);
2195
2196         free_percpu(dev->tstats);
2197 }
2198
2199 /* Start ageing timer and join group when device is brought up */
2200 static int vxlan_open(struct net_device *dev)
2201 {
2202         struct vxlan_dev *vxlan = netdev_priv(dev);
2203         struct vxlan_sock *vs;
2204         int ret = 0;
2205
2206         vs = vxlan_sock_add(vxlan->net, vxlan->dst_port, vxlan_rcv, NULL,
2207                             false, vxlan->flags);
2208         if (IS_ERR(vs))
2209                 return PTR_ERR(vs);
2210
2211         vxlan_vs_add_dev(vs, vxlan);
2212
2213         if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
2214                 ret = vxlan_igmp_join(vxlan);
2215                 if (ret) {
2216                         vxlan_sock_release(vs);
2217                         return ret;
2218                 }
2219         }
2220
2221         if (vxlan->age_interval)
2222                 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2223
2224         return ret;
2225 }
2226
2227 /* Purge the forwarding table */
2228 static void vxlan_flush(struct vxlan_dev *vxlan)
2229 {
2230         unsigned int h;
2231
2232         spin_lock_bh(&vxlan->hash_lock);
2233         for (h = 0; h < FDB_HASH_SIZE; ++h) {
2234                 struct hlist_node *p, *n;
2235                 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2236                         struct vxlan_fdb *f
2237                                 = container_of(p, struct vxlan_fdb, hlist);
2238                         /* the all_zeros_mac entry is deleted at vxlan_uninit */
2239                         if (!is_zero_ether_addr(f->eth_addr))
2240                                 vxlan_fdb_destroy(vxlan, f);
2241                 }
2242         }
2243         spin_unlock_bh(&vxlan->hash_lock);
2244 }
2245
2246 /* Cleanup timer and forwarding table on shutdown */
2247 static int vxlan_stop(struct net_device *dev)
2248 {
2249         struct vxlan_dev *vxlan = netdev_priv(dev);
2250         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2251         struct vxlan_sock *vs = vxlan->vn_sock;
2252         int ret = 0;
2253
2254         if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
2255             !vxlan_group_used(vn, vxlan))
2256                 ret = vxlan_igmp_leave(vxlan);
2257
2258         del_timer_sync(&vxlan->age_timer);
2259
2260         vxlan_flush(vxlan);
2261         vxlan_sock_release(vs);
2262
2263         return ret;
2264 }
2265
2266 /* Stub, nothing needs to be done. */
2267 static void vxlan_set_multicast_list(struct net_device *dev)
2268 {
2269 }
2270
2271 static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2272 {
2273         struct vxlan_dev *vxlan = netdev_priv(dev);
2274         struct vxlan_rdst *dst = &vxlan->default_dst;
2275         struct net_device *lowerdev;
2276         int max_mtu;
2277
2278         lowerdev = __dev_get_by_index(vxlan->net, dst->remote_ifindex);
2279         if (lowerdev == NULL)
2280                 return eth_change_mtu(dev, new_mtu);
2281
2282         if (dst->remote_ip.sa.sa_family == AF_INET6)
2283                 max_mtu = lowerdev->mtu - VXLAN6_HEADROOM;
2284         else
2285                 max_mtu = lowerdev->mtu - VXLAN_HEADROOM;
2286
2287         if (new_mtu < 68 || new_mtu > max_mtu)
2288                 return -EINVAL;
2289
2290         dev->mtu = new_mtu;
2291         return 0;
2292 }
2293
2294 static const struct net_device_ops vxlan_netdev_ops = {
2295         .ndo_init               = vxlan_init,
2296         .ndo_uninit             = vxlan_uninit,
2297         .ndo_open               = vxlan_open,
2298         .ndo_stop               = vxlan_stop,
2299         .ndo_start_xmit         = vxlan_xmit,
2300         .ndo_get_stats64        = ip_tunnel_get_stats64,
2301         .ndo_set_rx_mode        = vxlan_set_multicast_list,
2302         .ndo_change_mtu         = vxlan_change_mtu,
2303         .ndo_validate_addr      = eth_validate_addr,
2304         .ndo_set_mac_address    = eth_mac_addr,
2305         .ndo_fdb_add            = vxlan_fdb_add,
2306         .ndo_fdb_del            = vxlan_fdb_delete,
2307         .ndo_fdb_dump           = vxlan_fdb_dump,
2308 };
2309
2310 /* Info for udev, that this is a virtual tunnel endpoint */
2311 static struct device_type vxlan_type = {
2312         .name = "vxlan",
2313 };
2314
2315 /* Calls the ndo_add_vxlan_port of the caller in order to
2316  * supply the listening VXLAN udp ports. Callers are expected
2317  * to implement the ndo_add_vxlan_port.
2318  */
2319 void vxlan_get_rx_port(struct net_device *dev)
2320 {
2321         struct vxlan_sock *vs;
2322         struct net *net = dev_net(dev);
2323         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2324         sa_family_t sa_family;
2325         __be16 port;
2326         unsigned int i;
2327
2328         spin_lock(&vn->sock_lock);
2329         for (i = 0; i < PORT_HASH_SIZE; ++i) {
2330                 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
2331                         port = inet_sk(vs->sock->sk)->inet_sport;
2332                         sa_family = vs->sock->sk->sk_family;
2333                         dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
2334                                                             port);
2335                 }
2336         }
2337         spin_unlock(&vn->sock_lock);
2338 }
2339 EXPORT_SYMBOL_GPL(vxlan_get_rx_port);
2340
2341 /* Initialize the device structure. */
2342 static void vxlan_setup(struct net_device *dev)
2343 {
2344         struct vxlan_dev *vxlan = netdev_priv(dev);
2345         unsigned int h;
2346
2347         eth_hw_addr_random(dev);
2348         ether_setup(dev);
2349         if (vxlan->default_dst.remote_ip.sa.sa_family == AF_INET6)
2350                 dev->needed_headroom = ETH_HLEN + VXLAN6_HEADROOM;
2351         else
2352                 dev->needed_headroom = ETH_HLEN + VXLAN_HEADROOM;
2353
2354         dev->netdev_ops = &vxlan_netdev_ops;
2355         dev->destructor = free_netdev;
2356         SET_NETDEV_DEVTYPE(dev, &vxlan_type);
2357
2358         dev->tx_queue_len = 0;
2359         dev->features   |= NETIF_F_LLTX;
2360         dev->features   |= NETIF_F_SG | NETIF_F_HW_CSUM;
2361         dev->features   |= NETIF_F_RXCSUM;
2362         dev->features   |= NETIF_F_GSO_SOFTWARE;
2363
2364         dev->vlan_features = dev->features;
2365         dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2366         dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
2367         dev->hw_features |= NETIF_F_GSO_SOFTWARE;
2368         dev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2369         netif_keep_dst(dev);
2370         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2371
2372         INIT_LIST_HEAD(&vxlan->next);
2373         spin_lock_init(&vxlan->hash_lock);
2374
2375         init_timer_deferrable(&vxlan->age_timer);
2376         vxlan->age_timer.function = vxlan_cleanup;
2377         vxlan->age_timer.data = (unsigned long) vxlan;
2378
2379         vxlan->dst_port = htons(vxlan_port);
2380
2381         vxlan->dev = dev;
2382
2383         for (h = 0; h < FDB_HASH_SIZE; ++h)
2384                 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
2385 }
2386
2387 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
2388         [IFLA_VXLAN_ID]         = { .type = NLA_U32 },
2389         [IFLA_VXLAN_GROUP]      = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
2390         [IFLA_VXLAN_GROUP6]     = { .len = sizeof(struct in6_addr) },
2391         [IFLA_VXLAN_LINK]       = { .type = NLA_U32 },
2392         [IFLA_VXLAN_LOCAL]      = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
2393         [IFLA_VXLAN_LOCAL6]     = { .len = sizeof(struct in6_addr) },
2394         [IFLA_VXLAN_TOS]        = { .type = NLA_U8 },
2395         [IFLA_VXLAN_TTL]        = { .type = NLA_U8 },
2396         [IFLA_VXLAN_LEARNING]   = { .type = NLA_U8 },
2397         [IFLA_VXLAN_AGEING]     = { .type = NLA_U32 },
2398         [IFLA_VXLAN_LIMIT]      = { .type = NLA_U32 },
2399         [IFLA_VXLAN_PORT_RANGE] = { .len  = sizeof(struct ifla_vxlan_port_range) },
2400         [IFLA_VXLAN_PROXY]      = { .type = NLA_U8 },
2401         [IFLA_VXLAN_RSC]        = { .type = NLA_U8 },
2402         [IFLA_VXLAN_L2MISS]     = { .type = NLA_U8 },
2403         [IFLA_VXLAN_L3MISS]     = { .type = NLA_U8 },
2404         [IFLA_VXLAN_PORT]       = { .type = NLA_U16 },
2405         [IFLA_VXLAN_UDP_CSUM]   = { .type = NLA_U8 },
2406         [IFLA_VXLAN_UDP_ZERO_CSUM6_TX]  = { .type = NLA_U8 },
2407         [IFLA_VXLAN_UDP_ZERO_CSUM6_RX]  = { .type = NLA_U8 },
2408         [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 },
2409         [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
2410         [IFLA_VXLAN_GBP]        = { .type = NLA_FLAG, },
2411         [IFLA_VXLAN_REMCSUM_NOPARTIAL]  = { .type = NLA_FLAG },
2412 };
2413
2414 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
2415 {
2416         if (tb[IFLA_ADDRESS]) {
2417                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
2418                         pr_debug("invalid link address (not ethernet)\n");
2419                         return -EINVAL;
2420                 }
2421
2422                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
2423                         pr_debug("invalid all zero ethernet address\n");
2424                         return -EADDRNOTAVAIL;
2425                 }
2426         }
2427
2428         if (!data)
2429                 return -EINVAL;
2430
2431         if (data[IFLA_VXLAN_ID]) {
2432                 __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
2433                 if (id >= VXLAN_VID_MASK)
2434                         return -ERANGE;
2435         }
2436
2437         if (data[IFLA_VXLAN_PORT_RANGE]) {
2438                 const struct ifla_vxlan_port_range *p
2439                         = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2440
2441                 if (ntohs(p->high) < ntohs(p->low)) {
2442                         pr_debug("port range %u .. %u not valid\n",
2443                                  ntohs(p->low), ntohs(p->high));
2444                         return -EINVAL;
2445                 }
2446         }
2447
2448         return 0;
2449 }
2450
2451 static void vxlan_get_drvinfo(struct net_device *netdev,
2452                               struct ethtool_drvinfo *drvinfo)
2453 {
2454         strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
2455         strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
2456 }
2457
2458 static const struct ethtool_ops vxlan_ethtool_ops = {
2459         .get_drvinfo    = vxlan_get_drvinfo,
2460         .get_link       = ethtool_op_get_link,
2461 };
2462
2463 static void vxlan_del_work(struct work_struct *work)
2464 {
2465         struct vxlan_sock *vs = container_of(work, struct vxlan_sock, del_work);
2466         udp_tunnel_sock_release(vs->sock);
2467         kfree_rcu(vs, rcu);
2468 }
2469
2470 static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
2471                                         __be16 port, u32 flags)
2472 {
2473         struct socket *sock;
2474         struct udp_port_cfg udp_conf;
2475         int err;
2476
2477         memset(&udp_conf, 0, sizeof(udp_conf));
2478
2479         if (ipv6) {
2480                 udp_conf.family = AF_INET6;
2481                 udp_conf.use_udp6_rx_checksums =
2482                     !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
2483         } else {
2484                 udp_conf.family = AF_INET;
2485         }
2486
2487         udp_conf.local_udp_port = port;
2488
2489         /* Open UDP socket */
2490         err = udp_sock_create(net, &udp_conf, &sock);
2491         if (err < 0)
2492                 return ERR_PTR(err);
2493
2494         return sock;
2495 }
2496
2497 /* Create new listen socket if needed */
2498 static struct vxlan_sock *vxlan_socket_create(struct net *net, __be16 port,
2499                                               vxlan_rcv_t *rcv, void *data,
2500                                               u32 flags)
2501 {
2502         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2503         struct vxlan_sock *vs;
2504         struct socket *sock;
2505         unsigned int h;
2506         bool ipv6 = !!(flags & VXLAN_F_IPV6);
2507         struct udp_tunnel_sock_cfg tunnel_cfg;
2508
2509         vs = kzalloc(sizeof(*vs), GFP_KERNEL);
2510         if (!vs)
2511                 return ERR_PTR(-ENOMEM);
2512
2513         for (h = 0; h < VNI_HASH_SIZE; ++h)
2514                 INIT_HLIST_HEAD(&vs->vni_list[h]);
2515
2516         INIT_WORK(&vs->del_work, vxlan_del_work);
2517
2518         sock = vxlan_create_sock(net, ipv6, port, flags);
2519         if (IS_ERR(sock)) {
2520                 pr_info("Cannot bind port %d, err=%ld\n", ntohs(port),
2521                         PTR_ERR(sock));
2522                 kfree(vs);
2523                 return ERR_CAST(sock);
2524         }
2525
2526         vs->sock = sock;
2527         atomic_set(&vs->refcnt, 1);
2528         vs->rcv = rcv;
2529         vs->data = data;
2530         vs->flags = (flags & VXLAN_F_RCV_FLAGS);
2531
2532         /* Initialize the vxlan udp offloads structure */
2533         vs->udp_offloads.port = port;
2534         vs->udp_offloads.callbacks.gro_receive  = vxlan_gro_receive;
2535         vs->udp_offloads.callbacks.gro_complete = vxlan_gro_complete;
2536
2537         spin_lock(&vn->sock_lock);
2538         hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
2539         vxlan_notify_add_rx_port(vs);
2540         spin_unlock(&vn->sock_lock);
2541
2542         /* Mark socket as an encapsulation socket. */
2543         tunnel_cfg.sk_user_data = vs;
2544         tunnel_cfg.encap_type = 1;
2545         tunnel_cfg.encap_rcv = vxlan_udp_encap_recv;
2546         tunnel_cfg.encap_destroy = NULL;
2547
2548         setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
2549
2550         return vs;
2551 }
2552
2553 struct vxlan_sock *vxlan_sock_add(struct net *net, __be16 port,
2554                                   vxlan_rcv_t *rcv, void *data,
2555                                   bool no_share, u32 flags)
2556 {
2557         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2558         struct vxlan_sock *vs;
2559         bool ipv6 = flags & VXLAN_F_IPV6;
2560
2561         if (!no_share) {
2562                 spin_lock(&vn->sock_lock);
2563                 vs = vxlan_find_sock(net, ipv6 ? AF_INET6 : AF_INET, port,
2564                                      flags);
2565                 if (vs && vs->rcv == rcv) {
2566                         if (!atomic_add_unless(&vs->refcnt, 1, 0))
2567                                 vs = ERR_PTR(-EBUSY);
2568                         spin_unlock(&vn->sock_lock);
2569                         return vs;
2570                 }
2571                 spin_unlock(&vn->sock_lock);
2572         }
2573
2574         return vxlan_socket_create(net, port, rcv, data, flags);
2575 }
2576 EXPORT_SYMBOL_GPL(vxlan_sock_add);
2577
2578 static int vxlan_newlink(struct net *src_net, struct net_device *dev,
2579                          struct nlattr *tb[], struct nlattr *data[])
2580 {
2581         struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
2582         struct vxlan_dev *vxlan = netdev_priv(dev);
2583         struct vxlan_rdst *dst = &vxlan->default_dst;
2584         __u32 vni;
2585         int err;
2586         bool use_ipv6 = false;
2587
2588         if (!data[IFLA_VXLAN_ID])
2589                 return -EINVAL;
2590
2591         vxlan->net = src_net;
2592
2593         vni = nla_get_u32(data[IFLA_VXLAN_ID]);
2594         dst->remote_vni = vni;
2595
2596         /* Unless IPv6 is explicitly requested, assume IPv4 */
2597         dst->remote_ip.sa.sa_family = AF_INET;
2598         if (data[IFLA_VXLAN_GROUP]) {
2599                 dst->remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
2600         } else if (data[IFLA_VXLAN_GROUP6]) {
2601                 if (!IS_ENABLED(CONFIG_IPV6))
2602                         return -EPFNOSUPPORT;
2603
2604                 dst->remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]);
2605                 dst->remote_ip.sa.sa_family = AF_INET6;
2606                 use_ipv6 = true;
2607         }
2608
2609         if (data[IFLA_VXLAN_LOCAL]) {
2610                 vxlan->saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]);
2611                 vxlan->saddr.sa.sa_family = AF_INET;
2612         } else if (data[IFLA_VXLAN_LOCAL6]) {
2613                 if (!IS_ENABLED(CONFIG_IPV6))
2614                         return -EPFNOSUPPORT;
2615
2616                 /* TODO: respect scope id */
2617                 vxlan->saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
2618                 vxlan->saddr.sa.sa_family = AF_INET6;
2619                 use_ipv6 = true;
2620         }
2621
2622         if (data[IFLA_VXLAN_LINK] &&
2623             (dst->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]))) {
2624                 struct net_device *lowerdev
2625                          = __dev_get_by_index(src_net, dst->remote_ifindex);
2626
2627                 if (!lowerdev) {
2628                         pr_info("ifindex %d does not exist\n", dst->remote_ifindex);
2629                         return -ENODEV;
2630                 }
2631
2632 #if IS_ENABLED(CONFIG_IPV6)
2633                 if (use_ipv6) {
2634                         struct inet6_dev *idev = __in6_dev_get(lowerdev);
2635                         if (idev && idev->cnf.disable_ipv6) {
2636                                 pr_info("IPv6 is disabled via sysctl\n");
2637                                 return -EPERM;
2638                         }
2639                         vxlan->flags |= VXLAN_F_IPV6;
2640                 }
2641 #endif
2642
2643                 if (!tb[IFLA_MTU])
2644                         dev->mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2645
2646                 dev->needed_headroom = lowerdev->hard_header_len +
2647                                        (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2648         } else if (use_ipv6)
2649                 vxlan->flags |= VXLAN_F_IPV6;
2650
2651         if (data[IFLA_VXLAN_TOS])
2652                 vxlan->tos  = nla_get_u8(data[IFLA_VXLAN_TOS]);
2653
2654         if (data[IFLA_VXLAN_TTL])
2655                 vxlan->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
2656
2657         if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING]))
2658                 vxlan->flags |= VXLAN_F_LEARN;
2659
2660         if (data[IFLA_VXLAN_AGEING])
2661                 vxlan->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
2662         else
2663                 vxlan->age_interval = FDB_AGE_DEFAULT;
2664
2665         if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY]))
2666                 vxlan->flags |= VXLAN_F_PROXY;
2667
2668         if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC]))
2669                 vxlan->flags |= VXLAN_F_RSC;
2670
2671         if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS]))
2672                 vxlan->flags |= VXLAN_F_L2MISS;
2673
2674         if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS]))
2675                 vxlan->flags |= VXLAN_F_L3MISS;
2676
2677         if (data[IFLA_VXLAN_LIMIT])
2678                 vxlan->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
2679
2680         if (data[IFLA_VXLAN_PORT_RANGE]) {
2681                 const struct ifla_vxlan_port_range *p
2682                         = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2683                 vxlan->port_min = ntohs(p->low);
2684                 vxlan->port_max = ntohs(p->high);
2685         }
2686
2687         if (data[IFLA_VXLAN_PORT])
2688                 vxlan->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
2689
2690         if (data[IFLA_VXLAN_UDP_CSUM] && nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
2691                 vxlan->flags |= VXLAN_F_UDP_CSUM;
2692
2693         if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX] &&
2694             nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
2695                 vxlan->flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
2696
2697         if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX] &&
2698             nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
2699                 vxlan->flags |= VXLAN_F_UDP_ZERO_CSUM6_RX;
2700
2701         if (data[IFLA_VXLAN_REMCSUM_TX] &&
2702             nla_get_u8(data[IFLA_VXLAN_REMCSUM_TX]))
2703                 vxlan->flags |= VXLAN_F_REMCSUM_TX;
2704
2705         if (data[IFLA_VXLAN_REMCSUM_RX] &&
2706             nla_get_u8(data[IFLA_VXLAN_REMCSUM_RX]))
2707                 vxlan->flags |= VXLAN_F_REMCSUM_RX;
2708
2709         if (data[IFLA_VXLAN_GBP])
2710                 vxlan->flags |= VXLAN_F_GBP;
2711
2712         if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL])
2713                 vxlan->flags |= VXLAN_F_REMCSUM_NOPARTIAL;
2714
2715         if (vxlan_find_vni(src_net, vni, use_ipv6 ? AF_INET6 : AF_INET,
2716                            vxlan->dst_port, vxlan->flags)) {
2717                 pr_info("duplicate VNI %u\n", vni);
2718                 return -EEXIST;
2719         }
2720
2721         dev->ethtool_ops = &vxlan_ethtool_ops;
2722
2723         /* create an fdb entry for a valid default destination */
2724         if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
2725                 err = vxlan_fdb_create(vxlan, all_zeros_mac,
2726                                        &vxlan->default_dst.remote_ip,
2727                                        NUD_REACHABLE|NUD_PERMANENT,
2728                                        NLM_F_EXCL|NLM_F_CREATE,
2729                                        vxlan->dst_port,
2730                                        vxlan->default_dst.remote_vni,
2731                                        vxlan->default_dst.remote_ifindex,
2732                                        NTF_SELF);
2733                 if (err)
2734                         return err;
2735         }
2736
2737         err = register_netdevice(dev);
2738         if (err) {
2739                 vxlan_fdb_delete_default(vxlan);
2740                 return err;
2741         }
2742
2743         list_add(&vxlan->next, &vn->vxlan_list);
2744
2745         return 0;
2746 }
2747
2748 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
2749 {
2750         struct vxlan_dev *vxlan = netdev_priv(dev);
2751         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2752
2753         spin_lock(&vn->sock_lock);
2754         if (!hlist_unhashed(&vxlan->hlist))
2755                 hlist_del_rcu(&vxlan->hlist);
2756         spin_unlock(&vn->sock_lock);
2757
2758         list_del(&vxlan->next);
2759         unregister_netdevice_queue(dev, head);
2760 }
2761
2762 static size_t vxlan_get_size(const struct net_device *dev)
2763 {
2764
2765         return nla_total_size(sizeof(__u32)) +  /* IFLA_VXLAN_ID */
2766                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
2767                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
2768                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
2769                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TTL */
2770                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TOS */
2771                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_LEARNING */
2772                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_PROXY */
2773                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_RSC */
2774                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_L2MISS */
2775                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_L3MISS */
2776                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
2777                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
2778                 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
2779                 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
2780                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
2781                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
2782                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
2783                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
2784                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
2785                 0;
2786 }
2787
2788 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
2789 {
2790         const struct vxlan_dev *vxlan = netdev_priv(dev);
2791         const struct vxlan_rdst *dst = &vxlan->default_dst;
2792         struct ifla_vxlan_port_range ports = {
2793                 .low =  htons(vxlan->port_min),
2794                 .high = htons(vxlan->port_max),
2795         };
2796
2797         if (nla_put_u32(skb, IFLA_VXLAN_ID, dst->remote_vni))
2798                 goto nla_put_failure;
2799
2800         if (!vxlan_addr_any(&dst->remote_ip)) {
2801                 if (dst->remote_ip.sa.sa_family == AF_INET) {
2802                         if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP,
2803                                             dst->remote_ip.sin.sin_addr.s_addr))
2804                                 goto nla_put_failure;
2805 #if IS_ENABLED(CONFIG_IPV6)
2806                 } else {
2807                         if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6,
2808                                              &dst->remote_ip.sin6.sin6_addr))
2809                                 goto nla_put_failure;
2810 #endif
2811                 }
2812         }
2813
2814         if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
2815                 goto nla_put_failure;
2816
2817         if (!vxlan_addr_any(&vxlan->saddr)) {
2818                 if (vxlan->saddr.sa.sa_family == AF_INET) {
2819                         if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL,
2820                                             vxlan->saddr.sin.sin_addr.s_addr))
2821                                 goto nla_put_failure;
2822 #if IS_ENABLED(CONFIG_IPV6)
2823                 } else {
2824                         if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6,
2825                                              &vxlan->saddr.sin6.sin6_addr))
2826                                 goto nla_put_failure;
2827 #endif
2828                 }
2829         }
2830
2831         if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->ttl) ||
2832             nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->tos) ||
2833             nla_put_u8(skb, IFLA_VXLAN_LEARNING,
2834                         !!(vxlan->flags & VXLAN_F_LEARN)) ||
2835             nla_put_u8(skb, IFLA_VXLAN_PROXY,
2836                         !!(vxlan->flags & VXLAN_F_PROXY)) ||
2837             nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) ||
2838             nla_put_u8(skb, IFLA_VXLAN_L2MISS,
2839                         !!(vxlan->flags & VXLAN_F_L2MISS)) ||
2840             nla_put_u8(skb, IFLA_VXLAN_L3MISS,
2841                         !!(vxlan->flags & VXLAN_F_L3MISS)) ||
2842             nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->age_interval) ||
2843             nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->addrmax) ||
2844             nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->dst_port) ||
2845             nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
2846                         !!(vxlan->flags & VXLAN_F_UDP_CSUM)) ||
2847             nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
2848                         !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
2849             nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
2850                         !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
2851             nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
2852                         !!(vxlan->flags & VXLAN_F_REMCSUM_TX)) ||
2853             nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
2854                         !!(vxlan->flags & VXLAN_F_REMCSUM_RX)))
2855                 goto nla_put_failure;
2856
2857         if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
2858                 goto nla_put_failure;
2859
2860         if (vxlan->flags & VXLAN_F_GBP &&
2861             nla_put_flag(skb, IFLA_VXLAN_GBP))
2862                 goto nla_put_failure;
2863
2864         if (vxlan->flags & VXLAN_F_REMCSUM_NOPARTIAL &&
2865             nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
2866                 goto nla_put_failure;
2867
2868         return 0;
2869
2870 nla_put_failure:
2871         return -EMSGSIZE;
2872 }
2873
2874 static struct net *vxlan_get_link_net(const struct net_device *dev)
2875 {
2876         struct vxlan_dev *vxlan = netdev_priv(dev);
2877
2878         return vxlan->net;
2879 }
2880
2881 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
2882         .kind           = "vxlan",
2883         .maxtype        = IFLA_VXLAN_MAX,
2884         .policy         = vxlan_policy,
2885         .priv_size      = sizeof(struct vxlan_dev),
2886         .setup          = vxlan_setup,
2887         .validate       = vxlan_validate,
2888         .newlink        = vxlan_newlink,
2889         .dellink        = vxlan_dellink,
2890         .get_size       = vxlan_get_size,
2891         .fill_info      = vxlan_fill_info,
2892         .get_link_net   = vxlan_get_link_net,
2893 };
2894
2895 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
2896                                              struct net_device *dev)
2897 {
2898         struct vxlan_dev *vxlan, *next;
2899         LIST_HEAD(list_kill);
2900
2901         list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
2902                 struct vxlan_rdst *dst = &vxlan->default_dst;
2903
2904                 /* In case we created vxlan device with carrier
2905                  * and we loose the carrier due to module unload
2906                  * we also need to remove vxlan device. In other
2907                  * cases, it's not necessary and remote_ifindex
2908                  * is 0 here, so no matches.
2909                  */
2910                 if (dst->remote_ifindex == dev->ifindex)
2911                         vxlan_dellink(vxlan->dev, &list_kill);
2912         }
2913
2914         unregister_netdevice_many(&list_kill);
2915 }
2916
2917 static int vxlan_lowerdev_event(struct notifier_block *unused,
2918                                 unsigned long event, void *ptr)
2919 {
2920         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2921         struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
2922
2923         if (event == NETDEV_UNREGISTER)
2924                 vxlan_handle_lowerdev_unregister(vn, dev);
2925
2926         return NOTIFY_DONE;
2927 }
2928
2929 static struct notifier_block vxlan_notifier_block __read_mostly = {
2930         .notifier_call = vxlan_lowerdev_event,
2931 };
2932
2933 static __net_init int vxlan_init_net(struct net *net)
2934 {
2935         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2936         unsigned int h;
2937
2938         INIT_LIST_HEAD(&vn->vxlan_list);
2939         spin_lock_init(&vn->sock_lock);
2940
2941         for (h = 0; h < PORT_HASH_SIZE; ++h)
2942                 INIT_HLIST_HEAD(&vn->sock_list[h]);
2943
2944         return 0;
2945 }
2946
2947 static void __net_exit vxlan_exit_net(struct net *net)
2948 {
2949         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2950         struct vxlan_dev *vxlan, *next;
2951         struct net_device *dev, *aux;
2952         LIST_HEAD(list);
2953
2954         rtnl_lock();
2955         for_each_netdev_safe(net, dev, aux)
2956                 if (dev->rtnl_link_ops == &vxlan_link_ops)
2957                         unregister_netdevice_queue(dev, &list);
2958
2959         list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
2960                 /* If vxlan->dev is in the same netns, it has already been added
2961                  * to the list by the previous loop.
2962                  */
2963                 if (!net_eq(dev_net(vxlan->dev), net))
2964                         unregister_netdevice_queue(vxlan->dev, &list);
2965         }
2966
2967         unregister_netdevice_many(&list);
2968         rtnl_unlock();
2969 }
2970
2971 static struct pernet_operations vxlan_net_ops = {
2972         .init = vxlan_init_net,
2973         .exit = vxlan_exit_net,
2974         .id   = &vxlan_net_id,
2975         .size = sizeof(struct vxlan_net),
2976 };
2977
2978 static int __init vxlan_init_module(void)
2979 {
2980         int rc;
2981
2982         vxlan_wq = alloc_workqueue("vxlan", 0, 0);
2983         if (!vxlan_wq)
2984                 return -ENOMEM;
2985
2986         get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
2987
2988         rc = register_pernet_subsys(&vxlan_net_ops);
2989         if (rc)
2990                 goto out1;
2991
2992         rc = register_netdevice_notifier(&vxlan_notifier_block);
2993         if (rc)
2994                 goto out2;
2995
2996         rc = rtnl_link_register(&vxlan_link_ops);
2997         if (rc)
2998                 goto out3;
2999
3000         return 0;
3001 out3:
3002         unregister_netdevice_notifier(&vxlan_notifier_block);
3003 out2:
3004         unregister_pernet_subsys(&vxlan_net_ops);
3005 out1:
3006         destroy_workqueue(vxlan_wq);
3007         return rc;
3008 }
3009 late_initcall(vxlan_init_module);
3010
3011 static void __exit vxlan_cleanup_module(void)
3012 {
3013         rtnl_link_unregister(&vxlan_link_ops);
3014         unregister_netdevice_notifier(&vxlan_notifier_block);
3015         destroy_workqueue(vxlan_wq);
3016         unregister_pernet_subsys(&vxlan_net_ops);
3017         /* rcu_barrier() is called by netns */
3018 }
3019 module_exit(vxlan_cleanup_module);
3020
3021 MODULE_LICENSE("GPL");
3022 MODULE_VERSION(VXLAN_VERSION);
3023 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
3024 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
3025 MODULE_ALIAS_RTNL_LINK("vxlan");