1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * VXLAN: Virtual eXtensible Local Area Network 4 * 5 * Copyright (c) 2012-2013 Vyatta Inc. 6 */ 7 8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 9 10 #include <linux/kernel.h> 11 #include <linux/module.h> 12 #include <linux/errno.h> 13 #include <linux/slab.h> 14 #include <linux/udp.h> 15 #include <linux/igmp.h> 16 #include <linux/if_ether.h> 17 #include <linux/ethtool.h> 18 #include <net/arp.h> 19 #include <net/ndisc.h> 20 #include <net/gro.h> 21 #include <net/ipv6_stubs.h> 22 #include <net/ip.h> 23 #include <net/icmp.h> 24 #include <net/rtnetlink.h> 25 #include <net/inet_ecn.h> 26 #include <net/net_namespace.h> 27 #include <net/netns/generic.h> 28 #include <net/tun_proto.h> 29 #include <net/vxlan.h> 30 #include <net/nexthop.h> 31 32 #if IS_ENABLED(CONFIG_IPV6) 33 #include <net/ip6_tunnel.h> 34 #include <net/ip6_checksum.h> 35 #endif 36 37 #include "vxlan_private.h" 38 39 #define VXLAN_VERSION "0.1" 40 41 #define FDB_AGE_DEFAULT 300 /* 5 min */ 42 #define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */ 43 44 /* UDP port for VXLAN traffic. 45 * The IANA assigned port is 4789, but the Linux default is 8472 46 * for compatibility with early adopters. 47 */ 48 static unsigned short vxlan_port __read_mostly = 8472; 49 module_param_named(udp_port, vxlan_port, ushort, 0444); 50 MODULE_PARM_DESC(udp_port, "Destination UDP port"); 51 52 static bool log_ecn_error = true; 53 module_param(log_ecn_error, bool, 0644); 54 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); 55 56 unsigned int vxlan_net_id; 57 58 const u8 all_zeros_mac[ETH_ALEN + 2]; 59 static struct rtnl_link_ops vxlan_link_ops; 60 61 static int vxlan_sock_add(struct vxlan_dev *vxlan); 62 63 static void vxlan_vs_del_dev(struct vxlan_dev *vxlan); 64 65 /* salt for hash table */ 66 static u32 vxlan_salt __read_mostly; 67 68 static inline bool vxlan_collect_metadata(struct vxlan_sock *vs) 69 { 70 return vs->flags & VXLAN_F_COLLECT_METADATA || 71 ip_tunnel_collect_metadata(); 72 } 73 74 /* Find VXLAN socket based on network namespace, address family, UDP port, 75 * enabled unshareable flags and socket device binding (see l3mdev with 76 * non-default VRF). 77 */ 78 static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family, 79 __be16 port, u32 flags, int ifindex) 80 { 81 struct vxlan_sock *vs; 82 83 flags &= VXLAN_F_RCV_FLAGS; 84 85 hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) { 86 if (inet_sk(vs->sock->sk)->inet_sport == port && 87 vxlan_get_sk_family(vs) == family && 88 vs->flags == flags && 89 vs->sock->sk->sk_bound_dev_if == ifindex) 90 return vs; 91 } 92 return NULL; 93 } 94 95 static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, 96 int ifindex, __be32 vni, 97 struct vxlan_vni_node **vninode) 98 { 99 struct vxlan_vni_node *vnode; 100 struct vxlan_dev_node *node; 101 102 /* For flow based devices, map all packets to VNI 0 */ 103 if (vs->flags & VXLAN_F_COLLECT_METADATA && 104 !(vs->flags & VXLAN_F_VNIFILTER)) 105 vni = 0; 106 107 hlist_for_each_entry_rcu(node, vni_head(vs, vni), hlist) { 108 if (!node->vxlan) 109 continue; 110 vnode = NULL; 111 if (node->vxlan->cfg.flags & VXLAN_F_VNIFILTER) { 112 vnode = vxlan_vnifilter_lookup(node->vxlan, vni); 113 if (!vnode) 114 continue; 115 } else if (node->vxlan->default_dst.remote_vni != vni) { 116 continue; 117 } 118 119 if (IS_ENABLED(CONFIG_IPV6)) { 120 const struct vxlan_config *cfg = &node->vxlan->cfg; 121 122 if ((cfg->flags & VXLAN_F_IPV6_LINKLOCAL) && 123 cfg->remote_ifindex != ifindex) 124 continue; 125 } 126 127 if (vninode) 128 *vninode = vnode; 129 return node->vxlan; 130 } 131 132 return NULL; 133 } 134 135 /* Look up VNI in a per net namespace table */ 136 static struct vxlan_dev *vxlan_find_vni(struct net *net, int ifindex, 137 __be32 vni, sa_family_t family, 138 __be16 port, u32 flags) 139 { 140 struct vxlan_sock *vs; 141 142 vs = vxlan_find_sock(net, family, port, flags, ifindex); 143 if (!vs) 144 return NULL; 145 146 return vxlan_vs_find_vni(vs, ifindex, vni, NULL); 147 } 148 149 /* Fill in neighbour message in skbuff. */ 150 static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan, 151 const struct vxlan_fdb *fdb, 152 u32 portid, u32 seq, int type, unsigned int flags, 153 const struct vxlan_rdst *rdst) 154 { 155 unsigned long now = jiffies; 156 struct nda_cacheinfo ci; 157 bool send_ip, send_eth; 158 struct nlmsghdr *nlh; 159 struct nexthop *nh; 160 struct ndmsg *ndm; 161 int nh_family; 162 u32 nh_id; 163 164 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags); 165 if (nlh == NULL) 166 return -EMSGSIZE; 167 168 ndm = nlmsg_data(nlh); 169 memset(ndm, 0, sizeof(*ndm)); 170 171 send_eth = send_ip = true; 172 173 rcu_read_lock(); 174 nh = rcu_dereference(fdb->nh); 175 if (nh) { 176 nh_family = nexthop_get_family(nh); 177 nh_id = nh->id; 178 } 179 rcu_read_unlock(); 180 181 if (type == RTM_GETNEIGH) { 182 if (rdst) { 183 send_ip = !vxlan_addr_any(&rdst->remote_ip); 184 ndm->ndm_family = send_ip ? rdst->remote_ip.sa.sa_family : AF_INET; 185 } else if (nh) { 186 ndm->ndm_family = nh_family; 187 } 188 send_eth = !is_zero_ether_addr(fdb->eth_addr); 189 } else 190 ndm->ndm_family = AF_BRIDGE; 191 ndm->ndm_state = fdb->state; 192 ndm->ndm_ifindex = vxlan->dev->ifindex; 193 ndm->ndm_flags = fdb->flags; 194 if (rdst && rdst->offloaded) 195 ndm->ndm_flags |= NTF_OFFLOADED; 196 ndm->ndm_type = RTN_UNICAST; 197 198 if (!net_eq(dev_net(vxlan->dev), vxlan->net) && 199 nla_put_s32(skb, NDA_LINK_NETNSID, 200 peernet2id(dev_net(vxlan->dev), vxlan->net))) 201 goto nla_put_failure; 202 203 if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr)) 204 goto nla_put_failure; 205 if (nh) { 206 if (nla_put_u32(skb, NDA_NH_ID, nh_id)) 207 goto nla_put_failure; 208 } else if (rdst) { 209 if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, 210 &rdst->remote_ip)) 211 goto nla_put_failure; 212 213 if (rdst->remote_port && 214 rdst->remote_port != vxlan->cfg.dst_port && 215 nla_put_be16(skb, NDA_PORT, rdst->remote_port)) 216 goto nla_put_failure; 217 if (rdst->remote_vni != vxlan->default_dst.remote_vni && 218 nla_put_u32(skb, NDA_VNI, be32_to_cpu(rdst->remote_vni))) 219 goto nla_put_failure; 220 if (rdst->remote_ifindex && 221 nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex)) 222 goto nla_put_failure; 223 } 224 225 if ((vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) && fdb->vni && 226 nla_put_u32(skb, NDA_SRC_VNI, 227 be32_to_cpu(fdb->vni))) 228 goto nla_put_failure; 229 230 ci.ndm_used = jiffies_to_clock_t(now - fdb->used); 231 ci.ndm_confirmed = 0; 232 ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated); 233 ci.ndm_refcnt = 0; 234 235 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci)) 236 goto nla_put_failure; 237 238 nlmsg_end(skb, nlh); 239 return 0; 240 241 nla_put_failure: 242 nlmsg_cancel(skb, nlh); 243 return -EMSGSIZE; 244 } 245 246 static inline size_t vxlan_nlmsg_size(void) 247 { 248 return NLMSG_ALIGN(sizeof(struct ndmsg)) 249 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */ 250 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */ 251 + nla_total_size(sizeof(__be16)) /* NDA_PORT */ 252 + nla_total_size(sizeof(__be32)) /* NDA_VNI */ 253 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */ 254 + nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */ 255 + nla_total_size(sizeof(struct nda_cacheinfo)); 256 } 257 258 static void __vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb, 259 struct vxlan_rdst *rd, int type) 260 { 261 struct net *net = dev_net(vxlan->dev); 262 struct sk_buff *skb; 263 int err = -ENOBUFS; 264 265 skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC); 266 if (skb == NULL) 267 goto errout; 268 269 err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd); 270 if (err < 0) { 271 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */ 272 WARN_ON(err == -EMSGSIZE); 273 kfree_skb(skb); 274 goto errout; 275 } 276 277 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); 278 return; 279 errout: 280 if (err < 0) 281 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); 282 } 283 284 static void vxlan_fdb_switchdev_notifier_info(const struct vxlan_dev *vxlan, 285 const struct vxlan_fdb *fdb, 286 const struct vxlan_rdst *rd, 287 struct netlink_ext_ack *extack, 288 struct switchdev_notifier_vxlan_fdb_info *fdb_info) 289 { 290 fdb_info->info.dev = vxlan->dev; 291 fdb_info->info.extack = extack; 292 fdb_info->remote_ip = rd->remote_ip; 293 fdb_info->remote_port = rd->remote_port; 294 fdb_info->remote_vni = rd->remote_vni; 295 fdb_info->remote_ifindex = rd->remote_ifindex; 296 memcpy(fdb_info->eth_addr, fdb->eth_addr, ETH_ALEN); 297 fdb_info->vni = fdb->vni; 298 fdb_info->offloaded = rd->offloaded; 299 fdb_info->added_by_user = fdb->flags & NTF_VXLAN_ADDED_BY_USER; 300 } 301 302 static int vxlan_fdb_switchdev_call_notifiers(struct vxlan_dev *vxlan, 303 struct vxlan_fdb *fdb, 304 struct vxlan_rdst *rd, 305 bool adding, 306 struct netlink_ext_ack *extack) 307 { 308 struct switchdev_notifier_vxlan_fdb_info info; 309 enum switchdev_notifier_type notifier_type; 310 int ret; 311 312 if (WARN_ON(!rd)) 313 return 0; 314 315 notifier_type = adding ? SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE 316 : SWITCHDEV_VXLAN_FDB_DEL_TO_DEVICE; 317 vxlan_fdb_switchdev_notifier_info(vxlan, fdb, rd, NULL, &info); 318 ret = call_switchdev_notifiers(notifier_type, vxlan->dev, 319 &info.info, extack); 320 return notifier_to_errno(ret); 321 } 322 323 static int vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb, 324 struct vxlan_rdst *rd, int type, bool swdev_notify, 325 struct netlink_ext_ack *extack) 326 { 327 int err; 328 329 if (swdev_notify && rd) { 330 switch (type) { 331 case RTM_NEWNEIGH: 332 err = vxlan_fdb_switchdev_call_notifiers(vxlan, fdb, rd, 333 true, extack); 334 if (err) 335 return err; 336 break; 337 case RTM_DELNEIGH: 338 vxlan_fdb_switchdev_call_notifiers(vxlan, fdb, rd, 339 false, extack); 340 break; 341 } 342 } 343 344 __vxlan_fdb_notify(vxlan, fdb, rd, type); 345 return 0; 346 } 347 348 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa) 349 { 350 struct vxlan_dev *vxlan = netdev_priv(dev); 351 struct vxlan_fdb f = { 352 .state = NUD_STALE, 353 }; 354 struct vxlan_rdst remote = { 355 .remote_ip = *ipa, /* goes to NDA_DST */ 356 .remote_vni = cpu_to_be32(VXLAN_N_VID), 357 }; 358 359 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH, true, NULL); 360 } 361 362 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN]) 363 { 364 struct vxlan_fdb f = { 365 .state = NUD_STALE, 366 }; 367 struct vxlan_rdst remote = { }; 368 369 memcpy(f.eth_addr, eth_addr, ETH_ALEN); 370 371 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH, true, NULL); 372 } 373 374 /* Hash Ethernet address */ 375 static u32 eth_hash(const unsigned char *addr) 376 { 377 u64 value = get_unaligned((u64 *)addr); 378 379 /* only want 6 bytes */ 380 #ifdef __BIG_ENDIAN 381 value >>= 16; 382 #else 383 value <<= 16; 384 #endif 385 return hash_64(value, FDB_HASH_BITS); 386 } 387 388 u32 eth_vni_hash(const unsigned char *addr, __be32 vni) 389 { 390 /* use 1 byte of OUI and 3 bytes of NIC */ 391 u32 key = get_unaligned((u32 *)(addr + 2)); 392 393 return jhash_2words(key, vni, vxlan_salt) & (FDB_HASH_SIZE - 1); 394 } 395 396 u32 fdb_head_index(struct vxlan_dev *vxlan, const u8 *mac, __be32 vni) 397 { 398 if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) 399 return eth_vni_hash(mac, vni); 400 else 401 return eth_hash(mac); 402 } 403 404 /* Hash chain to use given mac address */ 405 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan, 406 const u8 *mac, __be32 vni) 407 { 408 return &vxlan->fdb_head[fdb_head_index(vxlan, mac, vni)]; 409 } 410 411 /* Look up Ethernet address in forwarding table */ 412 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan, 413 const u8 *mac, __be32 vni) 414 { 415 struct hlist_head *head = vxlan_fdb_head(vxlan, mac, vni); 416 struct vxlan_fdb *f; 417 418 hlist_for_each_entry_rcu(f, head, hlist) { 419 if (ether_addr_equal(mac, f->eth_addr)) { 420 if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) { 421 if (vni == f->vni) 422 return f; 423 } else { 424 return f; 425 } 426 } 427 } 428 429 return NULL; 430 } 431 432 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan, 433 const u8 *mac, __be32 vni) 434 { 435 struct vxlan_fdb *f; 436 437 f = __vxlan_find_mac(vxlan, mac, vni); 438 if (f && f->used != jiffies) 439 f->used = jiffies; 440 441 return f; 442 } 443 444 /* caller should hold vxlan->hash_lock */ 445 static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f, 446 union vxlan_addr *ip, __be16 port, 447 __be32 vni, __u32 ifindex) 448 { 449 struct vxlan_rdst *rd; 450 451 list_for_each_entry(rd, &f->remotes, list) { 452 if (vxlan_addr_equal(&rd->remote_ip, ip) && 453 rd->remote_port == port && 454 rd->remote_vni == vni && 455 rd->remote_ifindex == ifindex) 456 return rd; 457 } 458 459 return NULL; 460 } 461 462 int vxlan_fdb_find_uc(struct net_device *dev, const u8 *mac, __be32 vni, 463 struct switchdev_notifier_vxlan_fdb_info *fdb_info) 464 { 465 struct vxlan_dev *vxlan = netdev_priv(dev); 466 u8 eth_addr[ETH_ALEN + 2] = { 0 }; 467 struct vxlan_rdst *rdst; 468 struct vxlan_fdb *f; 469 int rc = 0; 470 471 if (is_multicast_ether_addr(mac) || 472 is_zero_ether_addr(mac)) 473 return -EINVAL; 474 475 ether_addr_copy(eth_addr, mac); 476 477 rcu_read_lock(); 478 479 f = __vxlan_find_mac(vxlan, eth_addr, vni); 480 if (!f) { 481 rc = -ENOENT; 482 goto out; 483 } 484 485 rdst = first_remote_rcu(f); 486 vxlan_fdb_switchdev_notifier_info(vxlan, f, rdst, NULL, fdb_info); 487 488 out: 489 rcu_read_unlock(); 490 return rc; 491 } 492 EXPORT_SYMBOL_GPL(vxlan_fdb_find_uc); 493 494 static int vxlan_fdb_notify_one(struct notifier_block *nb, 495 const struct vxlan_dev *vxlan, 496 const struct vxlan_fdb *f, 497 const struct vxlan_rdst *rdst, 498 struct netlink_ext_ack *extack) 499 { 500 struct switchdev_notifier_vxlan_fdb_info fdb_info; 501 int rc; 502 503 vxlan_fdb_switchdev_notifier_info(vxlan, f, rdst, extack, &fdb_info); 504 rc = nb->notifier_call(nb, SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE, 505 &fdb_info); 506 return notifier_to_errno(rc); 507 } 508 509 int vxlan_fdb_replay(const struct net_device *dev, __be32 vni, 510 struct notifier_block *nb, 511 struct netlink_ext_ack *extack) 512 { 513 struct vxlan_dev *vxlan; 514 struct vxlan_rdst *rdst; 515 struct vxlan_fdb *f; 516 unsigned int h; 517 int rc = 0; 518 519 if (!netif_is_vxlan(dev)) 520 return -EINVAL; 521 vxlan = netdev_priv(dev); 522 523 for (h = 0; h < FDB_HASH_SIZE; ++h) { 524 spin_lock_bh(&vxlan->hash_lock[h]); 525 hlist_for_each_entry(f, &vxlan->fdb_head[h], hlist) { 526 if (f->vni == vni) { 527 list_for_each_entry(rdst, &f->remotes, list) { 528 rc = vxlan_fdb_notify_one(nb, vxlan, 529 f, rdst, 530 extack); 531 if (rc) 532 goto unlock; 533 } 534 } 535 } 536 spin_unlock_bh(&vxlan->hash_lock[h]); 537 } 538 return 0; 539 540 unlock: 541 spin_unlock_bh(&vxlan->hash_lock[h]); 542 return rc; 543 } 544 EXPORT_SYMBOL_GPL(vxlan_fdb_replay); 545 546 void vxlan_fdb_clear_offload(const struct net_device *dev, __be32 vni) 547 { 548 struct vxlan_dev *vxlan; 549 struct vxlan_rdst *rdst; 550 struct vxlan_fdb *f; 551 unsigned int h; 552 553 if (!netif_is_vxlan(dev)) 554 return; 555 vxlan = netdev_priv(dev); 556 557 for (h = 0; h < FDB_HASH_SIZE; ++h) { 558 spin_lock_bh(&vxlan->hash_lock[h]); 559 hlist_for_each_entry(f, &vxlan->fdb_head[h], hlist) 560 if (f->vni == vni) 561 list_for_each_entry(rdst, &f->remotes, list) 562 rdst->offloaded = false; 563 spin_unlock_bh(&vxlan->hash_lock[h]); 564 } 565 566 } 567 EXPORT_SYMBOL_GPL(vxlan_fdb_clear_offload); 568 569 /* Replace destination of unicast mac */ 570 static int vxlan_fdb_replace(struct vxlan_fdb *f, 571 union vxlan_addr *ip, __be16 port, __be32 vni, 572 __u32 ifindex, struct vxlan_rdst *oldrd) 573 { 574 struct vxlan_rdst *rd; 575 576 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex); 577 if (rd) 578 return 0; 579 580 rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list); 581 if (!rd) 582 return 0; 583 584 *oldrd = *rd; 585 dst_cache_reset(&rd->dst_cache); 586 rd->remote_ip = *ip; 587 rd->remote_port = port; 588 rd->remote_vni = vni; 589 rd->remote_ifindex = ifindex; 590 rd->offloaded = false; 591 return 1; 592 } 593 594 /* Add/update destinations for multicast */ 595 static int vxlan_fdb_append(struct vxlan_fdb *f, 596 union vxlan_addr *ip, __be16 port, __be32 vni, 597 __u32 ifindex, struct vxlan_rdst **rdp) 598 { 599 struct vxlan_rdst *rd; 600 601 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex); 602 if (rd) 603 return 0; 604 605 rd = kmalloc(sizeof(*rd), GFP_ATOMIC); 606 if (rd == NULL) 607 return -ENOMEM; 608 609 if (dst_cache_init(&rd->dst_cache, GFP_ATOMIC)) { 610 kfree(rd); 611 return -ENOMEM; 612 } 613 614 rd->remote_ip = *ip; 615 rd->remote_port = port; 616 rd->offloaded = false; 617 rd->remote_vni = vni; 618 rd->remote_ifindex = ifindex; 619 620 list_add_tail_rcu(&rd->list, &f->remotes); 621 622 *rdp = rd; 623 return 1; 624 } 625 626 static bool vxlan_parse_gpe_proto(struct vxlanhdr *hdr, __be16 *protocol) 627 { 628 struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)hdr; 629 630 /* Need to have Next Protocol set for interfaces in GPE mode. */ 631 if (!gpe->np_applied) 632 return false; 633 /* "The initial version is 0. If a receiver does not support the 634 * version indicated it MUST drop the packet. 635 */ 636 if (gpe->version != 0) 637 return false; 638 /* "When the O bit is set to 1, the packet is an OAM packet and OAM 639 * processing MUST occur." However, we don't implement OAM 640 * processing, thus drop the packet. 641 */ 642 if (gpe->oam_flag) 643 return false; 644 645 *protocol = tun_p_to_eth_p(gpe->next_protocol); 646 if (!*protocol) 647 return false; 648 649 return true; 650 } 651 652 static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb, 653 unsigned int off, 654 struct vxlanhdr *vh, size_t hdrlen, 655 __be32 vni_field, 656 struct gro_remcsum *grc, 657 bool nopartial) 658 { 659 size_t start, offset; 660 661 if (skb->remcsum_offload) 662 return vh; 663 664 if (!NAPI_GRO_CB(skb)->csum_valid) 665 return NULL; 666 667 start = vxlan_rco_start(vni_field); 668 offset = start + vxlan_rco_offset(vni_field); 669 670 vh = skb_gro_remcsum_process(skb, (void *)vh, off, hdrlen, 671 start, offset, grc, nopartial); 672 673 skb->remcsum_offload = 1; 674 675 return vh; 676 } 677 678 static struct vxlanhdr *vxlan_gro_prepare_receive(struct sock *sk, 679 struct list_head *head, 680 struct sk_buff *skb, 681 struct gro_remcsum *grc) 682 { 683 struct sk_buff *p; 684 struct vxlanhdr *vh, *vh2; 685 unsigned int hlen, off_vx; 686 struct vxlan_sock *vs = rcu_dereference_sk_user_data(sk); 687 __be32 flags; 688 689 skb_gro_remcsum_init(grc); 690 691 off_vx = skb_gro_offset(skb); 692 hlen = off_vx + sizeof(*vh); 693 vh = skb_gro_header(skb, hlen, off_vx); 694 if (unlikely(!vh)) 695 return NULL; 696 697 skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr)); 698 699 flags = vh->vx_flags; 700 701 if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) { 702 vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr), 703 vh->vx_vni, grc, 704 !!(vs->flags & 705 VXLAN_F_REMCSUM_NOPARTIAL)); 706 707 if (!vh) 708 return NULL; 709 } 710 711 skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */ 712 713 list_for_each_entry(p, head, list) { 714 if (!NAPI_GRO_CB(p)->same_flow) 715 continue; 716 717 vh2 = (struct vxlanhdr *)(p->data + off_vx); 718 if (vh->vx_flags != vh2->vx_flags || 719 vh->vx_vni != vh2->vx_vni) { 720 NAPI_GRO_CB(p)->same_flow = 0; 721 continue; 722 } 723 } 724 725 return vh; 726 } 727 728 static struct sk_buff *vxlan_gro_receive(struct sock *sk, 729 struct list_head *head, 730 struct sk_buff *skb) 731 { 732 struct sk_buff *pp = NULL; 733 struct gro_remcsum grc; 734 int flush = 1; 735 736 if (vxlan_gro_prepare_receive(sk, head, skb, &grc)) { 737 pp = call_gro_receive(eth_gro_receive, head, skb); 738 flush = 0; 739 } 740 skb_gro_flush_final_remcsum(skb, pp, flush, &grc); 741 return pp; 742 } 743 744 static struct sk_buff *vxlan_gpe_gro_receive(struct sock *sk, 745 struct list_head *head, 746 struct sk_buff *skb) 747 { 748 const struct packet_offload *ptype; 749 struct sk_buff *pp = NULL; 750 struct gro_remcsum grc; 751 struct vxlanhdr *vh; 752 __be16 protocol; 753 int flush = 1; 754 755 vh = vxlan_gro_prepare_receive(sk, head, skb, &grc); 756 if (vh) { 757 if (!vxlan_parse_gpe_proto(vh, &protocol)) 758 goto out; 759 ptype = gro_find_receive_by_type(protocol); 760 if (!ptype) 761 goto out; 762 pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb); 763 flush = 0; 764 } 765 out: 766 skb_gro_flush_final_remcsum(skb, pp, flush, &grc); 767 return pp; 768 } 769 770 static int vxlan_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff) 771 { 772 /* Sets 'skb->inner_mac_header' since we are always called with 773 * 'skb->encapsulation' set. 774 */ 775 return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr)); 776 } 777 778 static int vxlan_gpe_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff) 779 { 780 struct vxlanhdr *vh = (struct vxlanhdr *)(skb->data + nhoff); 781 const struct packet_offload *ptype; 782 int err = -ENOSYS; 783 __be16 protocol; 784 785 if (!vxlan_parse_gpe_proto(vh, &protocol)) 786 return err; 787 ptype = gro_find_complete_by_type(protocol); 788 if (ptype) 789 err = ptype->callbacks.gro_complete(skb, nhoff + sizeof(struct vxlanhdr)); 790 return err; 791 } 792 793 static struct vxlan_fdb *vxlan_fdb_alloc(struct vxlan_dev *vxlan, const u8 *mac, 794 __u16 state, __be32 src_vni, 795 __u16 ndm_flags) 796 { 797 struct vxlan_fdb *f; 798 799 f = kmalloc(sizeof(*f), GFP_ATOMIC); 800 if (!f) 801 return NULL; 802 f->state = state; 803 f->flags = ndm_flags; 804 f->updated = f->used = jiffies; 805 f->vni = src_vni; 806 f->nh = NULL; 807 RCU_INIT_POINTER(f->vdev, vxlan); 808 INIT_LIST_HEAD(&f->nh_list); 809 INIT_LIST_HEAD(&f->remotes); 810 memcpy(f->eth_addr, mac, ETH_ALEN); 811 812 return f; 813 } 814 815 static void vxlan_fdb_insert(struct vxlan_dev *vxlan, const u8 *mac, 816 __be32 src_vni, struct vxlan_fdb *f) 817 { 818 ++vxlan->addrcnt; 819 hlist_add_head_rcu(&f->hlist, 820 vxlan_fdb_head(vxlan, mac, src_vni)); 821 } 822 823 static int vxlan_fdb_nh_update(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb, 824 u32 nhid, struct netlink_ext_ack *extack) 825 { 826 struct nexthop *old_nh = rtnl_dereference(fdb->nh); 827 struct nexthop *nh; 828 int err = -EINVAL; 829 830 if (old_nh && old_nh->id == nhid) 831 return 0; 832 833 nh = nexthop_find_by_id(vxlan->net, nhid); 834 if (!nh) { 835 NL_SET_ERR_MSG(extack, "Nexthop id does not exist"); 836 goto err_inval; 837 } 838 839 if (!nexthop_get(nh)) { 840 NL_SET_ERR_MSG(extack, "Nexthop has been deleted"); 841 nh = NULL; 842 goto err_inval; 843 } 844 if (!nexthop_is_fdb(nh)) { 845 NL_SET_ERR_MSG(extack, "Nexthop is not a fdb nexthop"); 846 goto err_inval; 847 } 848 849 if (!nexthop_is_multipath(nh)) { 850 NL_SET_ERR_MSG(extack, "Nexthop is not a multipath group"); 851 goto err_inval; 852 } 853 854 /* check nexthop group family */ 855 switch (vxlan->default_dst.remote_ip.sa.sa_family) { 856 case AF_INET: 857 if (!nexthop_has_v4(nh)) { 858 err = -EAFNOSUPPORT; 859 NL_SET_ERR_MSG(extack, "Nexthop group family not supported"); 860 goto err_inval; 861 } 862 break; 863 case AF_INET6: 864 if (nexthop_has_v4(nh)) { 865 err = -EAFNOSUPPORT; 866 NL_SET_ERR_MSG(extack, "Nexthop group family not supported"); 867 goto err_inval; 868 } 869 } 870 871 if (old_nh) { 872 list_del_rcu(&fdb->nh_list); 873 nexthop_put(old_nh); 874 } 875 rcu_assign_pointer(fdb->nh, nh); 876 list_add_tail_rcu(&fdb->nh_list, &nh->fdb_list); 877 return 1; 878 879 err_inval: 880 if (nh) 881 nexthop_put(nh); 882 return err; 883 } 884 885 int vxlan_fdb_create(struct vxlan_dev *vxlan, 886 const u8 *mac, union vxlan_addr *ip, 887 __u16 state, __be16 port, __be32 src_vni, 888 __be32 vni, __u32 ifindex, __u16 ndm_flags, 889 u32 nhid, struct vxlan_fdb **fdb, 890 struct netlink_ext_ack *extack) 891 { 892 struct vxlan_rdst *rd = NULL; 893 struct vxlan_fdb *f; 894 int rc; 895 896 if (vxlan->cfg.addrmax && 897 vxlan->addrcnt >= vxlan->cfg.addrmax) 898 return -ENOSPC; 899 900 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip); 901 f = vxlan_fdb_alloc(vxlan, mac, state, src_vni, ndm_flags); 902 if (!f) 903 return -ENOMEM; 904 905 if (nhid) 906 rc = vxlan_fdb_nh_update(vxlan, f, nhid, extack); 907 else 908 rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd); 909 if (rc < 0) 910 goto errout; 911 912 *fdb = f; 913 914 return 0; 915 916 errout: 917 kfree(f); 918 return rc; 919 } 920 921 static void __vxlan_fdb_free(struct vxlan_fdb *f) 922 { 923 struct vxlan_rdst *rd, *nd; 924 struct nexthop *nh; 925 926 nh = rcu_dereference_raw(f->nh); 927 if (nh) { 928 rcu_assign_pointer(f->nh, NULL); 929 rcu_assign_pointer(f->vdev, NULL); 930 nexthop_put(nh); 931 } 932 933 list_for_each_entry_safe(rd, nd, &f->remotes, list) { 934 dst_cache_destroy(&rd->dst_cache); 935 kfree(rd); 936 } 937 kfree(f); 938 } 939 940 static void vxlan_fdb_free(struct rcu_head *head) 941 { 942 struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu); 943 944 __vxlan_fdb_free(f); 945 } 946 947 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f, 948 bool do_notify, bool swdev_notify) 949 { 950 struct vxlan_rdst *rd; 951 952 netdev_dbg(vxlan->dev, "delete %pM\n", f->eth_addr); 953 954 --vxlan->addrcnt; 955 if (do_notify) { 956 if (rcu_access_pointer(f->nh)) 957 vxlan_fdb_notify(vxlan, f, NULL, RTM_DELNEIGH, 958 swdev_notify, NULL); 959 else 960 list_for_each_entry(rd, &f->remotes, list) 961 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH, 962 swdev_notify, NULL); 963 } 964 965 hlist_del_rcu(&f->hlist); 966 list_del_rcu(&f->nh_list); 967 call_rcu(&f->rcu, vxlan_fdb_free); 968 } 969 970 static void vxlan_dst_free(struct rcu_head *head) 971 { 972 struct vxlan_rdst *rd = container_of(head, struct vxlan_rdst, rcu); 973 974 dst_cache_destroy(&rd->dst_cache); 975 kfree(rd); 976 } 977 978 static int vxlan_fdb_update_existing(struct vxlan_dev *vxlan, 979 union vxlan_addr *ip, 980 __u16 state, __u16 flags, 981 __be16 port, __be32 vni, 982 __u32 ifindex, __u16 ndm_flags, 983 struct vxlan_fdb *f, u32 nhid, 984 bool swdev_notify, 985 struct netlink_ext_ack *extack) 986 { 987 __u16 fdb_flags = (ndm_flags & ~NTF_USE); 988 struct vxlan_rdst *rd = NULL; 989 struct vxlan_rdst oldrd; 990 int notify = 0; 991 int rc = 0; 992 int err; 993 994 if (nhid && !rcu_access_pointer(f->nh)) { 995 NL_SET_ERR_MSG(extack, 996 "Cannot replace an existing non nexthop fdb with a nexthop"); 997 return -EOPNOTSUPP; 998 } 999 1000 if (nhid && (flags & NLM_F_APPEND)) { 1001 NL_SET_ERR_MSG(extack, 1002 "Cannot append to a nexthop fdb"); 1003 return -EOPNOTSUPP; 1004 } 1005 1006 /* Do not allow an externally learned entry to take over an entry added 1007 * by the user. 1008 */ 1009 if (!(fdb_flags & NTF_EXT_LEARNED) || 1010 !(f->flags & NTF_VXLAN_ADDED_BY_USER)) { 1011 if (f->state != state) { 1012 f->state = state; 1013 f->updated = jiffies; 1014 notify = 1; 1015 } 1016 if (f->flags != fdb_flags) { 1017 f->flags = fdb_flags; 1018 f->updated = jiffies; 1019 notify = 1; 1020 } 1021 } 1022 1023 if ((flags & NLM_F_REPLACE)) { 1024 /* Only change unicasts */ 1025 if (!(is_multicast_ether_addr(f->eth_addr) || 1026 is_zero_ether_addr(f->eth_addr))) { 1027 if (nhid) { 1028 rc = vxlan_fdb_nh_update(vxlan, f, nhid, extack); 1029 if (rc < 0) 1030 return rc; 1031 } else { 1032 rc = vxlan_fdb_replace(f, ip, port, vni, 1033 ifindex, &oldrd); 1034 } 1035 notify |= rc; 1036 } else { 1037 NL_SET_ERR_MSG(extack, "Cannot replace non-unicast fdb entries"); 1038 return -EOPNOTSUPP; 1039 } 1040 } 1041 if ((flags & NLM_F_APPEND) && 1042 (is_multicast_ether_addr(f->eth_addr) || 1043 is_zero_ether_addr(f->eth_addr))) { 1044 rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd); 1045 1046 if (rc < 0) 1047 return rc; 1048 notify |= rc; 1049 } 1050 1051 if (ndm_flags & NTF_USE) 1052 f->used = jiffies; 1053 1054 if (notify) { 1055 if (rd == NULL) 1056 rd = first_remote_rtnl(f); 1057 1058 err = vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH, 1059 swdev_notify, extack); 1060 if (err) 1061 goto err_notify; 1062 } 1063 1064 return 0; 1065 1066 err_notify: 1067 if (nhid) 1068 return err; 1069 if ((flags & NLM_F_REPLACE) && rc) 1070 *rd = oldrd; 1071 else if ((flags & NLM_F_APPEND) && rc) { 1072 list_del_rcu(&rd->list); 1073 call_rcu(&rd->rcu, vxlan_dst_free); 1074 } 1075 return err; 1076 } 1077 1078 static int vxlan_fdb_update_create(struct vxlan_dev *vxlan, 1079 const u8 *mac, union vxlan_addr *ip, 1080 __u16 state, __u16 flags, 1081 __be16 port, __be32 src_vni, __be32 vni, 1082 __u32 ifindex, __u16 ndm_flags, u32 nhid, 1083 bool swdev_notify, 1084 struct netlink_ext_ack *extack) 1085 { 1086 __u16 fdb_flags = (ndm_flags & ~NTF_USE); 1087 struct vxlan_fdb *f; 1088 int rc; 1089 1090 /* Disallow replace to add a multicast entry */ 1091 if ((flags & NLM_F_REPLACE) && 1092 (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac))) 1093 return -EOPNOTSUPP; 1094 1095 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip); 1096 rc = vxlan_fdb_create(vxlan, mac, ip, state, port, src_vni, 1097 vni, ifindex, fdb_flags, nhid, &f, extack); 1098 if (rc < 0) 1099 return rc; 1100 1101 vxlan_fdb_insert(vxlan, mac, src_vni, f); 1102 rc = vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_NEWNEIGH, 1103 swdev_notify, extack); 1104 if (rc) 1105 goto err_notify; 1106 1107 return 0; 1108 1109 err_notify: 1110 vxlan_fdb_destroy(vxlan, f, false, false); 1111 return rc; 1112 } 1113 1114 /* Add new entry to forwarding table -- assumes lock held */ 1115 int vxlan_fdb_update(struct vxlan_dev *vxlan, 1116 const u8 *mac, union vxlan_addr *ip, 1117 __u16 state, __u16 flags, 1118 __be16 port, __be32 src_vni, __be32 vni, 1119 __u32 ifindex, __u16 ndm_flags, u32 nhid, 1120 bool swdev_notify, 1121 struct netlink_ext_ack *extack) 1122 { 1123 struct vxlan_fdb *f; 1124 1125 f = __vxlan_find_mac(vxlan, mac, src_vni); 1126 if (f) { 1127 if (flags & NLM_F_EXCL) { 1128 netdev_dbg(vxlan->dev, 1129 "lost race to create %pM\n", mac); 1130 return -EEXIST; 1131 } 1132 1133 return vxlan_fdb_update_existing(vxlan, ip, state, flags, port, 1134 vni, ifindex, ndm_flags, f, 1135 nhid, swdev_notify, extack); 1136 } else { 1137 if (!(flags & NLM_F_CREATE)) 1138 return -ENOENT; 1139 1140 return vxlan_fdb_update_create(vxlan, mac, ip, state, flags, 1141 port, src_vni, vni, ifindex, 1142 ndm_flags, nhid, swdev_notify, 1143 extack); 1144 } 1145 } 1146 1147 static void vxlan_fdb_dst_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f, 1148 struct vxlan_rdst *rd, bool swdev_notify) 1149 { 1150 list_del_rcu(&rd->list); 1151 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH, swdev_notify, NULL); 1152 call_rcu(&rd->rcu, vxlan_dst_free); 1153 } 1154 1155 static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan, 1156 union vxlan_addr *ip, __be16 *port, __be32 *src_vni, 1157 __be32 *vni, u32 *ifindex, u32 *nhid, 1158 struct netlink_ext_ack *extack) 1159 { 1160 struct net *net = dev_net(vxlan->dev); 1161 int err; 1162 1163 if (tb[NDA_NH_ID] && 1164 (tb[NDA_DST] || tb[NDA_VNI] || tb[NDA_IFINDEX] || tb[NDA_PORT])) { 1165 NL_SET_ERR_MSG(extack, "DST, VNI, ifindex and port are mutually exclusive with NH_ID"); 1166 return -EINVAL; 1167 } 1168 1169 if (tb[NDA_DST]) { 1170 err = vxlan_nla_get_addr(ip, tb[NDA_DST]); 1171 if (err) { 1172 NL_SET_ERR_MSG(extack, "Unsupported address family"); 1173 return err; 1174 } 1175 } else { 1176 union vxlan_addr *remote = &vxlan->default_dst.remote_ip; 1177 1178 if (remote->sa.sa_family == AF_INET) { 1179 ip->sin.sin_addr.s_addr = htonl(INADDR_ANY); 1180 ip->sa.sa_family = AF_INET; 1181 #if IS_ENABLED(CONFIG_IPV6) 1182 } else { 1183 ip->sin6.sin6_addr = in6addr_any; 1184 ip->sa.sa_family = AF_INET6; 1185 #endif 1186 } 1187 } 1188 1189 if (tb[NDA_PORT]) { 1190 if (nla_len(tb[NDA_PORT]) != sizeof(__be16)) { 1191 NL_SET_ERR_MSG(extack, "Invalid vxlan port"); 1192 return -EINVAL; 1193 } 1194 *port = nla_get_be16(tb[NDA_PORT]); 1195 } else { 1196 *port = vxlan->cfg.dst_port; 1197 } 1198 1199 if (tb[NDA_VNI]) { 1200 if (nla_len(tb[NDA_VNI]) != sizeof(u32)) { 1201 NL_SET_ERR_MSG(extack, "Invalid vni"); 1202 return -EINVAL; 1203 } 1204 *vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI])); 1205 } else { 1206 *vni = vxlan->default_dst.remote_vni; 1207 } 1208 1209 if (tb[NDA_SRC_VNI]) { 1210 if (nla_len(tb[NDA_SRC_VNI]) != sizeof(u32)) { 1211 NL_SET_ERR_MSG(extack, "Invalid src vni"); 1212 return -EINVAL; 1213 } 1214 *src_vni = cpu_to_be32(nla_get_u32(tb[NDA_SRC_VNI])); 1215 } else { 1216 *src_vni = vxlan->default_dst.remote_vni; 1217 } 1218 1219 if (tb[NDA_IFINDEX]) { 1220 struct net_device *tdev; 1221 1222 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32)) { 1223 NL_SET_ERR_MSG(extack, "Invalid ifindex"); 1224 return -EINVAL; 1225 } 1226 *ifindex = nla_get_u32(tb[NDA_IFINDEX]); 1227 tdev = __dev_get_by_index(net, *ifindex); 1228 if (!tdev) { 1229 NL_SET_ERR_MSG(extack, "Device not found"); 1230 return -EADDRNOTAVAIL; 1231 } 1232 } else { 1233 *ifindex = 0; 1234 } 1235 1236 if (tb[NDA_NH_ID]) 1237 *nhid = nla_get_u32(tb[NDA_NH_ID]); 1238 else 1239 *nhid = 0; 1240 1241 return 0; 1242 } 1243 1244 /* Add static entry (via netlink) */ 1245 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[], 1246 struct net_device *dev, 1247 const unsigned char *addr, u16 vid, u16 flags, 1248 struct netlink_ext_ack *extack) 1249 { 1250 struct vxlan_dev *vxlan = netdev_priv(dev); 1251 /* struct net *net = dev_net(vxlan->dev); */ 1252 union vxlan_addr ip; 1253 __be16 port; 1254 __be32 src_vni, vni; 1255 u32 ifindex, nhid; 1256 u32 hash_index; 1257 int err; 1258 1259 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) { 1260 pr_info("RTM_NEWNEIGH with invalid state %#x\n", 1261 ndm->ndm_state); 1262 return -EINVAL; 1263 } 1264 1265 if (!tb || (!tb[NDA_DST] && !tb[NDA_NH_ID])) 1266 return -EINVAL; 1267 1268 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex, 1269 &nhid, extack); 1270 if (err) 1271 return err; 1272 1273 if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family) 1274 return -EAFNOSUPPORT; 1275 1276 hash_index = fdb_head_index(vxlan, addr, src_vni); 1277 spin_lock_bh(&vxlan->hash_lock[hash_index]); 1278 err = vxlan_fdb_update(vxlan, addr, &ip, ndm->ndm_state, flags, 1279 port, src_vni, vni, ifindex, 1280 ndm->ndm_flags | NTF_VXLAN_ADDED_BY_USER, 1281 nhid, true, extack); 1282 spin_unlock_bh(&vxlan->hash_lock[hash_index]); 1283 1284 return err; 1285 } 1286 1287 int __vxlan_fdb_delete(struct vxlan_dev *vxlan, 1288 const unsigned char *addr, union vxlan_addr ip, 1289 __be16 port, __be32 src_vni, __be32 vni, 1290 u32 ifindex, bool swdev_notify) 1291 { 1292 struct vxlan_rdst *rd = NULL; 1293 struct vxlan_fdb *f; 1294 int err = -ENOENT; 1295 1296 f = vxlan_find_mac(vxlan, addr, src_vni); 1297 if (!f) 1298 return err; 1299 1300 if (!vxlan_addr_any(&ip)) { 1301 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex); 1302 if (!rd) 1303 goto out; 1304 } 1305 1306 /* remove a destination if it's not the only one on the list, 1307 * otherwise destroy the fdb entry 1308 */ 1309 if (rd && !list_is_singular(&f->remotes)) { 1310 vxlan_fdb_dst_destroy(vxlan, f, rd, swdev_notify); 1311 goto out; 1312 } 1313 1314 vxlan_fdb_destroy(vxlan, f, true, swdev_notify); 1315 1316 out: 1317 return 0; 1318 } 1319 1320 /* Delete entry (via netlink) */ 1321 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[], 1322 struct net_device *dev, 1323 const unsigned char *addr, u16 vid, 1324 struct netlink_ext_ack *extack) 1325 { 1326 struct vxlan_dev *vxlan = netdev_priv(dev); 1327 union vxlan_addr ip; 1328 __be32 src_vni, vni; 1329 u32 ifindex, nhid; 1330 u32 hash_index; 1331 __be16 port; 1332 int err; 1333 1334 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex, 1335 &nhid, extack); 1336 if (err) 1337 return err; 1338 1339 hash_index = fdb_head_index(vxlan, addr, src_vni); 1340 spin_lock_bh(&vxlan->hash_lock[hash_index]); 1341 err = __vxlan_fdb_delete(vxlan, addr, ip, port, src_vni, vni, ifindex, 1342 true); 1343 spin_unlock_bh(&vxlan->hash_lock[hash_index]); 1344 1345 return err; 1346 } 1347 1348 /* Dump forwarding table */ 1349 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb, 1350 struct net_device *dev, 1351 struct net_device *filter_dev, int *idx) 1352 { 1353 struct vxlan_dev *vxlan = netdev_priv(dev); 1354 unsigned int h; 1355 int err = 0; 1356 1357 for (h = 0; h < FDB_HASH_SIZE; ++h) { 1358 struct vxlan_fdb *f; 1359 1360 rcu_read_lock(); 1361 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) { 1362 struct vxlan_rdst *rd; 1363 1364 if (rcu_access_pointer(f->nh)) { 1365 if (*idx < cb->args[2]) 1366 goto skip_nh; 1367 err = vxlan_fdb_info(skb, vxlan, f, 1368 NETLINK_CB(cb->skb).portid, 1369 cb->nlh->nlmsg_seq, 1370 RTM_NEWNEIGH, 1371 NLM_F_MULTI, NULL); 1372 if (err < 0) { 1373 rcu_read_unlock(); 1374 goto out; 1375 } 1376 skip_nh: 1377 *idx += 1; 1378 continue; 1379 } 1380 1381 list_for_each_entry_rcu(rd, &f->remotes, list) { 1382 if (*idx < cb->args[2]) 1383 goto skip; 1384 1385 err = vxlan_fdb_info(skb, vxlan, f, 1386 NETLINK_CB(cb->skb).portid, 1387 cb->nlh->nlmsg_seq, 1388 RTM_NEWNEIGH, 1389 NLM_F_MULTI, rd); 1390 if (err < 0) { 1391 rcu_read_unlock(); 1392 goto out; 1393 } 1394 skip: 1395 *idx += 1; 1396 } 1397 } 1398 rcu_read_unlock(); 1399 } 1400 out: 1401 return err; 1402 } 1403 1404 static int vxlan_fdb_get(struct sk_buff *skb, 1405 struct nlattr *tb[], 1406 struct net_device *dev, 1407 const unsigned char *addr, 1408 u16 vid, u32 portid, u32 seq, 1409 struct netlink_ext_ack *extack) 1410 { 1411 struct vxlan_dev *vxlan = netdev_priv(dev); 1412 struct vxlan_fdb *f; 1413 __be32 vni; 1414 int err; 1415 1416 if (tb[NDA_VNI]) 1417 vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI])); 1418 else 1419 vni = vxlan->default_dst.remote_vni; 1420 1421 rcu_read_lock(); 1422 1423 f = __vxlan_find_mac(vxlan, addr, vni); 1424 if (!f) { 1425 NL_SET_ERR_MSG(extack, "Fdb entry not found"); 1426 err = -ENOENT; 1427 goto errout; 1428 } 1429 1430 err = vxlan_fdb_info(skb, vxlan, f, portid, seq, 1431 RTM_NEWNEIGH, 0, first_remote_rcu(f)); 1432 errout: 1433 rcu_read_unlock(); 1434 return err; 1435 } 1436 1437 /* Watch incoming packets to learn mapping between Ethernet address 1438 * and Tunnel endpoint. 1439 * Return true if packet is bogus and should be dropped. 1440 */ 1441 static bool vxlan_snoop(struct net_device *dev, 1442 union vxlan_addr *src_ip, const u8 *src_mac, 1443 u32 src_ifindex, __be32 vni) 1444 { 1445 struct vxlan_dev *vxlan = netdev_priv(dev); 1446 struct vxlan_fdb *f; 1447 u32 ifindex = 0; 1448 1449 #if IS_ENABLED(CONFIG_IPV6) 1450 if (src_ip->sa.sa_family == AF_INET6 && 1451 (ipv6_addr_type(&src_ip->sin6.sin6_addr) & IPV6_ADDR_LINKLOCAL)) 1452 ifindex = src_ifindex; 1453 #endif 1454 1455 f = vxlan_find_mac(vxlan, src_mac, vni); 1456 if (likely(f)) { 1457 struct vxlan_rdst *rdst = first_remote_rcu(f); 1458 1459 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip) && 1460 rdst->remote_ifindex == ifindex)) 1461 return false; 1462 1463 /* Don't migrate static entries, drop packets */ 1464 if (f->state & (NUD_PERMANENT | NUD_NOARP)) 1465 return true; 1466 1467 /* Don't override an fdb with nexthop with a learnt entry */ 1468 if (rcu_access_pointer(f->nh)) 1469 return true; 1470 1471 if (net_ratelimit()) 1472 netdev_info(dev, 1473 "%pM migrated from %pIS to %pIS\n", 1474 src_mac, &rdst->remote_ip.sa, &src_ip->sa); 1475 1476 rdst->remote_ip = *src_ip; 1477 f->updated = jiffies; 1478 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH, true, NULL); 1479 } else { 1480 u32 hash_index = fdb_head_index(vxlan, src_mac, vni); 1481 1482 /* learned new entry */ 1483 spin_lock(&vxlan->hash_lock[hash_index]); 1484 1485 /* close off race between vxlan_flush and incoming packets */ 1486 if (netif_running(dev)) 1487 vxlan_fdb_update(vxlan, src_mac, src_ip, 1488 NUD_REACHABLE, 1489 NLM_F_EXCL|NLM_F_CREATE, 1490 vxlan->cfg.dst_port, 1491 vni, 1492 vxlan->default_dst.remote_vni, 1493 ifindex, NTF_SELF, 0, true, NULL); 1494 spin_unlock(&vxlan->hash_lock[hash_index]); 1495 } 1496 1497 return false; 1498 } 1499 1500 static bool __vxlan_sock_release_prep(struct vxlan_sock *vs) 1501 { 1502 struct vxlan_net *vn; 1503 1504 if (!vs) 1505 return false; 1506 if (!refcount_dec_and_test(&vs->refcnt)) 1507 return false; 1508 1509 vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id); 1510 spin_lock(&vn->sock_lock); 1511 hlist_del_rcu(&vs->hlist); 1512 udp_tunnel_notify_del_rx_port(vs->sock, 1513 (vs->flags & VXLAN_F_GPE) ? 1514 UDP_TUNNEL_TYPE_VXLAN_GPE : 1515 UDP_TUNNEL_TYPE_VXLAN); 1516 spin_unlock(&vn->sock_lock); 1517 1518 return true; 1519 } 1520 1521 static void vxlan_sock_release(struct vxlan_dev *vxlan) 1522 { 1523 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock); 1524 #if IS_ENABLED(CONFIG_IPV6) 1525 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock); 1526 1527 RCU_INIT_POINTER(vxlan->vn6_sock, NULL); 1528 #endif 1529 1530 RCU_INIT_POINTER(vxlan->vn4_sock, NULL); 1531 synchronize_net(); 1532 1533 if (vxlan->cfg.flags & VXLAN_F_VNIFILTER) 1534 vxlan_vs_del_vnigrp(vxlan); 1535 else 1536 vxlan_vs_del_dev(vxlan); 1537 1538 if (__vxlan_sock_release_prep(sock4)) { 1539 udp_tunnel_sock_release(sock4->sock); 1540 kfree(sock4); 1541 } 1542 1543 #if IS_ENABLED(CONFIG_IPV6) 1544 if (__vxlan_sock_release_prep(sock6)) { 1545 udp_tunnel_sock_release(sock6->sock); 1546 kfree(sock6); 1547 } 1548 #endif 1549 } 1550 1551 static bool vxlan_remcsum(struct vxlanhdr *unparsed, 1552 struct sk_buff *skb, u32 vxflags) 1553 { 1554 size_t start, offset; 1555 1556 if (!(unparsed->vx_flags & VXLAN_HF_RCO) || skb->remcsum_offload) 1557 goto out; 1558 1559 start = vxlan_rco_start(unparsed->vx_vni); 1560 offset = start + vxlan_rco_offset(unparsed->vx_vni); 1561 1562 if (!pskb_may_pull(skb, offset + sizeof(u16))) 1563 return false; 1564 1565 skb_remcsum_process(skb, (void *)(vxlan_hdr(skb) + 1), start, offset, 1566 !!(vxflags & VXLAN_F_REMCSUM_NOPARTIAL)); 1567 out: 1568 unparsed->vx_flags &= ~VXLAN_HF_RCO; 1569 unparsed->vx_vni &= VXLAN_VNI_MASK; 1570 return true; 1571 } 1572 1573 static void vxlan_parse_gbp_hdr(struct vxlanhdr *unparsed, 1574 struct sk_buff *skb, u32 vxflags, 1575 struct vxlan_metadata *md) 1576 { 1577 struct vxlanhdr_gbp *gbp = (struct vxlanhdr_gbp *)unparsed; 1578 struct metadata_dst *tun_dst; 1579 1580 if (!(unparsed->vx_flags & VXLAN_HF_GBP)) 1581 goto out; 1582 1583 md->gbp = ntohs(gbp->policy_id); 1584 1585 tun_dst = (struct metadata_dst *)skb_dst(skb); 1586 if (tun_dst) { 1587 tun_dst->u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT; 1588 tun_dst->u.tun_info.options_len = sizeof(*md); 1589 } 1590 if (gbp->dont_learn) 1591 md->gbp |= VXLAN_GBP_DONT_LEARN; 1592 1593 if (gbp->policy_applied) 1594 md->gbp |= VXLAN_GBP_POLICY_APPLIED; 1595 1596 /* In flow-based mode, GBP is carried in dst_metadata */ 1597 if (!(vxflags & VXLAN_F_COLLECT_METADATA)) 1598 skb->mark = md->gbp; 1599 out: 1600 unparsed->vx_flags &= ~VXLAN_GBP_USED_BITS; 1601 } 1602 1603 static bool vxlan_set_mac(struct vxlan_dev *vxlan, 1604 struct vxlan_sock *vs, 1605 struct sk_buff *skb, __be32 vni) 1606 { 1607 union vxlan_addr saddr; 1608 u32 ifindex = skb->dev->ifindex; 1609 1610 skb_reset_mac_header(skb); 1611 skb->protocol = eth_type_trans(skb, vxlan->dev); 1612 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); 1613 1614 /* Ignore packet loops (and multicast echo) */ 1615 if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr)) 1616 return false; 1617 1618 /* Get address from the outer IP header */ 1619 if (vxlan_get_sk_family(vs) == AF_INET) { 1620 saddr.sin.sin_addr.s_addr = ip_hdr(skb)->saddr; 1621 saddr.sa.sa_family = AF_INET; 1622 #if IS_ENABLED(CONFIG_IPV6) 1623 } else { 1624 saddr.sin6.sin6_addr = ipv6_hdr(skb)->saddr; 1625 saddr.sa.sa_family = AF_INET6; 1626 #endif 1627 } 1628 1629 if ((vxlan->cfg.flags & VXLAN_F_LEARN) && 1630 vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source, ifindex, vni)) 1631 return false; 1632 1633 return true; 1634 } 1635 1636 static bool vxlan_ecn_decapsulate(struct vxlan_sock *vs, void *oiph, 1637 struct sk_buff *skb) 1638 { 1639 int err = 0; 1640 1641 if (vxlan_get_sk_family(vs) == AF_INET) 1642 err = IP_ECN_decapsulate(oiph, skb); 1643 #if IS_ENABLED(CONFIG_IPV6) 1644 else 1645 err = IP6_ECN_decapsulate(oiph, skb); 1646 #endif 1647 1648 if (unlikely(err) && log_ecn_error) { 1649 if (vxlan_get_sk_family(vs) == AF_INET) 1650 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n", 1651 &((struct iphdr *)oiph)->saddr, 1652 ((struct iphdr *)oiph)->tos); 1653 else 1654 net_info_ratelimited("non-ECT from %pI6\n", 1655 &((struct ipv6hdr *)oiph)->saddr); 1656 } 1657 return err <= 1; 1658 } 1659 1660 /* Callback from net/ipv4/udp.c to receive packets */ 1661 static int vxlan_rcv(struct sock *sk, struct sk_buff *skb) 1662 { 1663 struct vxlan_vni_node *vninode = NULL; 1664 struct vxlan_dev *vxlan; 1665 struct vxlan_sock *vs; 1666 struct vxlanhdr unparsed; 1667 struct vxlan_metadata _md; 1668 struct vxlan_metadata *md = &_md; 1669 __be16 protocol = htons(ETH_P_TEB); 1670 bool raw_proto = false; 1671 void *oiph; 1672 __be32 vni = 0; 1673 1674 /* Need UDP and VXLAN header to be present */ 1675 if (!pskb_may_pull(skb, VXLAN_HLEN)) 1676 goto drop; 1677 1678 unparsed = *vxlan_hdr(skb); 1679 /* VNI flag always required to be set */ 1680 if (!(unparsed.vx_flags & VXLAN_HF_VNI)) { 1681 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n", 1682 ntohl(vxlan_hdr(skb)->vx_flags), 1683 ntohl(vxlan_hdr(skb)->vx_vni)); 1684 /* Return non vxlan pkt */ 1685 goto drop; 1686 } 1687 unparsed.vx_flags &= ~VXLAN_HF_VNI; 1688 unparsed.vx_vni &= ~VXLAN_VNI_MASK; 1689 1690 vs = rcu_dereference_sk_user_data(sk); 1691 if (!vs) 1692 goto drop; 1693 1694 vni = vxlan_vni(vxlan_hdr(skb)->vx_vni); 1695 1696 vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni, &vninode); 1697 if (!vxlan) 1698 goto drop; 1699 1700 /* For backwards compatibility, only allow reserved fields to be 1701 * used by VXLAN extensions if explicitly requested. 1702 */ 1703 if (vs->flags & VXLAN_F_GPE) { 1704 if (!vxlan_parse_gpe_proto(&unparsed, &protocol)) 1705 goto drop; 1706 unparsed.vx_flags &= ~VXLAN_GPE_USED_BITS; 1707 raw_proto = true; 1708 } 1709 1710 if (__iptunnel_pull_header(skb, VXLAN_HLEN, protocol, raw_proto, 1711 !net_eq(vxlan->net, dev_net(vxlan->dev)))) 1712 goto drop; 1713 1714 if (vs->flags & VXLAN_F_REMCSUM_RX) 1715 if (unlikely(!vxlan_remcsum(&unparsed, skb, vs->flags))) 1716 goto drop; 1717 1718 if (vxlan_collect_metadata(vs)) { 1719 struct metadata_dst *tun_dst; 1720 1721 tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), TUNNEL_KEY, 1722 key32_to_tunnel_id(vni), sizeof(*md)); 1723 1724 if (!tun_dst) 1725 goto drop; 1726 1727 md = ip_tunnel_info_opts(&tun_dst->u.tun_info); 1728 1729 skb_dst_set(skb, (struct dst_entry *)tun_dst); 1730 } else { 1731 memset(md, 0, sizeof(*md)); 1732 } 1733 1734 if (vs->flags & VXLAN_F_GBP) 1735 vxlan_parse_gbp_hdr(&unparsed, skb, vs->flags, md); 1736 /* Note that GBP and GPE can never be active together. This is 1737 * ensured in vxlan_dev_configure. 1738 */ 1739 1740 if (unparsed.vx_flags || unparsed.vx_vni) { 1741 /* If there are any unprocessed flags remaining treat 1742 * this as a malformed packet. This behavior diverges from 1743 * VXLAN RFC (RFC7348) which stipulates that bits in reserved 1744 * in reserved fields are to be ignored. The approach here 1745 * maintains compatibility with previous stack code, and also 1746 * is more robust and provides a little more security in 1747 * adding extensions to VXLAN. 1748 */ 1749 goto drop; 1750 } 1751 1752 if (!raw_proto) { 1753 if (!vxlan_set_mac(vxlan, vs, skb, vni)) 1754 goto drop; 1755 } else { 1756 skb_reset_mac_header(skb); 1757 skb->dev = vxlan->dev; 1758 skb->pkt_type = PACKET_HOST; 1759 } 1760 1761 oiph = skb_network_header(skb); 1762 skb_reset_network_header(skb); 1763 1764 if (!vxlan_ecn_decapsulate(vs, oiph, skb)) { 1765 ++vxlan->dev->stats.rx_frame_errors; 1766 ++vxlan->dev->stats.rx_errors; 1767 vxlan_vnifilter_count(vxlan, vni, vninode, 1768 VXLAN_VNI_STATS_RX_ERRORS, 0); 1769 goto drop; 1770 } 1771 1772 rcu_read_lock(); 1773 1774 if (unlikely(!(vxlan->dev->flags & IFF_UP))) { 1775 rcu_read_unlock(); 1776 dev_core_stats_rx_dropped_inc(vxlan->dev); 1777 vxlan_vnifilter_count(vxlan, vni, vninode, 1778 VXLAN_VNI_STATS_RX_DROPS, 0); 1779 goto drop; 1780 } 1781 1782 dev_sw_netstats_rx_add(vxlan->dev, skb->len); 1783 vxlan_vnifilter_count(vxlan, vni, vninode, VXLAN_VNI_STATS_RX, skb->len); 1784 gro_cells_receive(&vxlan->gro_cells, skb); 1785 1786 rcu_read_unlock(); 1787 1788 return 0; 1789 1790 drop: 1791 /* Consume bad packet */ 1792 kfree_skb(skb); 1793 return 0; 1794 } 1795 1796 /* Callback from net/ipv{4,6}/udp.c to check that we have a VNI for errors */ 1797 static int vxlan_err_lookup(struct sock *sk, struct sk_buff *skb) 1798 { 1799 struct vxlan_dev *vxlan; 1800 struct vxlan_sock *vs; 1801 struct vxlanhdr *hdr; 1802 __be32 vni; 1803 1804 if (!pskb_may_pull(skb, skb_transport_offset(skb) + VXLAN_HLEN)) 1805 return -EINVAL; 1806 1807 hdr = vxlan_hdr(skb); 1808 1809 if (!(hdr->vx_flags & VXLAN_HF_VNI)) 1810 return -EINVAL; 1811 1812 vs = rcu_dereference_sk_user_data(sk); 1813 if (!vs) 1814 return -ENOENT; 1815 1816 vni = vxlan_vni(hdr->vx_vni); 1817 vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni, NULL); 1818 if (!vxlan) 1819 return -ENOENT; 1820 1821 return 0; 1822 } 1823 1824 static int arp_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni) 1825 { 1826 struct vxlan_dev *vxlan = netdev_priv(dev); 1827 struct arphdr *parp; 1828 u8 *arpptr, *sha; 1829 __be32 sip, tip; 1830 struct neighbour *n; 1831 1832 if (dev->flags & IFF_NOARP) 1833 goto out; 1834 1835 if (!pskb_may_pull(skb, arp_hdr_len(dev))) { 1836 dev->stats.tx_dropped++; 1837 goto out; 1838 } 1839 parp = arp_hdr(skb); 1840 1841 if ((parp->ar_hrd != htons(ARPHRD_ETHER) && 1842 parp->ar_hrd != htons(ARPHRD_IEEE802)) || 1843 parp->ar_pro != htons(ETH_P_IP) || 1844 parp->ar_op != htons(ARPOP_REQUEST) || 1845 parp->ar_hln != dev->addr_len || 1846 parp->ar_pln != 4) 1847 goto out; 1848 arpptr = (u8 *)parp + sizeof(struct arphdr); 1849 sha = arpptr; 1850 arpptr += dev->addr_len; /* sha */ 1851 memcpy(&sip, arpptr, sizeof(sip)); 1852 arpptr += sizeof(sip); 1853 arpptr += dev->addr_len; /* tha */ 1854 memcpy(&tip, arpptr, sizeof(tip)); 1855 1856 if (ipv4_is_loopback(tip) || 1857 ipv4_is_multicast(tip)) 1858 goto out; 1859 1860 n = neigh_lookup(&arp_tbl, &tip, dev); 1861 1862 if (n) { 1863 struct vxlan_fdb *f; 1864 struct sk_buff *reply; 1865 1866 if (!(READ_ONCE(n->nud_state) & NUD_CONNECTED)) { 1867 neigh_release(n); 1868 goto out; 1869 } 1870 1871 f = vxlan_find_mac(vxlan, n->ha, vni); 1872 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) { 1873 /* bridge-local neighbor */ 1874 neigh_release(n); 1875 goto out; 1876 } 1877 1878 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha, 1879 n->ha, sha); 1880 1881 neigh_release(n); 1882 1883 if (reply == NULL) 1884 goto out; 1885 1886 skb_reset_mac_header(reply); 1887 __skb_pull(reply, skb_network_offset(reply)); 1888 reply->ip_summed = CHECKSUM_UNNECESSARY; 1889 reply->pkt_type = PACKET_HOST; 1890 1891 if (netif_rx(reply) == NET_RX_DROP) { 1892 dev->stats.rx_dropped++; 1893 vxlan_vnifilter_count(vxlan, vni, NULL, 1894 VXLAN_VNI_STATS_RX_DROPS, 0); 1895 } 1896 1897 } else if (vxlan->cfg.flags & VXLAN_F_L3MISS) { 1898 union vxlan_addr ipa = { 1899 .sin.sin_addr.s_addr = tip, 1900 .sin.sin_family = AF_INET, 1901 }; 1902 1903 vxlan_ip_miss(dev, &ipa); 1904 } 1905 out: 1906 consume_skb(skb); 1907 return NETDEV_TX_OK; 1908 } 1909 1910 #if IS_ENABLED(CONFIG_IPV6) 1911 static struct sk_buff *vxlan_na_create(struct sk_buff *request, 1912 struct neighbour *n, bool isrouter) 1913 { 1914 struct net_device *dev = request->dev; 1915 struct sk_buff *reply; 1916 struct nd_msg *ns, *na; 1917 struct ipv6hdr *pip6; 1918 u8 *daddr; 1919 int na_olen = 8; /* opt hdr + ETH_ALEN for target */ 1920 int ns_olen; 1921 int i, len; 1922 1923 if (dev == NULL || !pskb_may_pull(request, request->len)) 1924 return NULL; 1925 1926 len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) + 1927 sizeof(*na) + na_olen + dev->needed_tailroom; 1928 reply = alloc_skb(len, GFP_ATOMIC); 1929 if (reply == NULL) 1930 return NULL; 1931 1932 reply->protocol = htons(ETH_P_IPV6); 1933 reply->dev = dev; 1934 skb_reserve(reply, LL_RESERVED_SPACE(request->dev)); 1935 skb_push(reply, sizeof(struct ethhdr)); 1936 skb_reset_mac_header(reply); 1937 1938 ns = (struct nd_msg *)(ipv6_hdr(request) + 1); 1939 1940 daddr = eth_hdr(request)->h_source; 1941 ns_olen = request->len - skb_network_offset(request) - 1942 sizeof(struct ipv6hdr) - sizeof(*ns); 1943 for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) { 1944 if (!ns->opt[i + 1]) { 1945 kfree_skb(reply); 1946 return NULL; 1947 } 1948 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) { 1949 daddr = ns->opt + i + sizeof(struct nd_opt_hdr); 1950 break; 1951 } 1952 } 1953 1954 /* Ethernet header */ 1955 ether_addr_copy(eth_hdr(reply)->h_dest, daddr); 1956 ether_addr_copy(eth_hdr(reply)->h_source, n->ha); 1957 eth_hdr(reply)->h_proto = htons(ETH_P_IPV6); 1958 reply->protocol = htons(ETH_P_IPV6); 1959 1960 skb_pull(reply, sizeof(struct ethhdr)); 1961 skb_reset_network_header(reply); 1962 skb_put(reply, sizeof(struct ipv6hdr)); 1963 1964 /* IPv6 header */ 1965 1966 pip6 = ipv6_hdr(reply); 1967 memset(pip6, 0, sizeof(struct ipv6hdr)); 1968 pip6->version = 6; 1969 pip6->priority = ipv6_hdr(request)->priority; 1970 pip6->nexthdr = IPPROTO_ICMPV6; 1971 pip6->hop_limit = 255; 1972 pip6->daddr = ipv6_hdr(request)->saddr; 1973 pip6->saddr = *(struct in6_addr *)n->primary_key; 1974 1975 skb_pull(reply, sizeof(struct ipv6hdr)); 1976 skb_reset_transport_header(reply); 1977 1978 /* Neighbor Advertisement */ 1979 na = skb_put_zero(reply, sizeof(*na) + na_olen); 1980 na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT; 1981 na->icmph.icmp6_router = isrouter; 1982 na->icmph.icmp6_override = 1; 1983 na->icmph.icmp6_solicited = 1; 1984 na->target = ns->target; 1985 ether_addr_copy(&na->opt[2], n->ha); 1986 na->opt[0] = ND_OPT_TARGET_LL_ADDR; 1987 na->opt[1] = na_olen >> 3; 1988 1989 na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr, 1990 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6, 1991 csum_partial(na, sizeof(*na)+na_olen, 0)); 1992 1993 pip6->payload_len = htons(sizeof(*na)+na_olen); 1994 1995 skb_push(reply, sizeof(struct ipv6hdr)); 1996 1997 reply->ip_summed = CHECKSUM_UNNECESSARY; 1998 1999 return reply; 2000 } 2001 2002 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni) 2003 { 2004 struct vxlan_dev *vxlan = netdev_priv(dev); 2005 const struct in6_addr *daddr; 2006 const struct ipv6hdr *iphdr; 2007 struct inet6_dev *in6_dev; 2008 struct neighbour *n; 2009 struct nd_msg *msg; 2010 2011 rcu_read_lock(); 2012 in6_dev = __in6_dev_get(dev); 2013 if (!in6_dev) 2014 goto out; 2015 2016 iphdr = ipv6_hdr(skb); 2017 daddr = &iphdr->daddr; 2018 msg = (struct nd_msg *)(iphdr + 1); 2019 2020 if (ipv6_addr_loopback(daddr) || 2021 ipv6_addr_is_multicast(&msg->target)) 2022 goto out; 2023 2024 n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev); 2025 2026 if (n) { 2027 struct vxlan_fdb *f; 2028 struct sk_buff *reply; 2029 2030 if (!(READ_ONCE(n->nud_state) & NUD_CONNECTED)) { 2031 neigh_release(n); 2032 goto out; 2033 } 2034 2035 f = vxlan_find_mac(vxlan, n->ha, vni); 2036 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) { 2037 /* bridge-local neighbor */ 2038 neigh_release(n); 2039 goto out; 2040 } 2041 2042 reply = vxlan_na_create(skb, n, 2043 !!(f ? f->flags & NTF_ROUTER : 0)); 2044 2045 neigh_release(n); 2046 2047 if (reply == NULL) 2048 goto out; 2049 2050 if (netif_rx(reply) == NET_RX_DROP) { 2051 dev->stats.rx_dropped++; 2052 vxlan_vnifilter_count(vxlan, vni, NULL, 2053 VXLAN_VNI_STATS_RX_DROPS, 0); 2054 } 2055 } else if (vxlan->cfg.flags & VXLAN_F_L3MISS) { 2056 union vxlan_addr ipa = { 2057 .sin6.sin6_addr = msg->target, 2058 .sin6.sin6_family = AF_INET6, 2059 }; 2060 2061 vxlan_ip_miss(dev, &ipa); 2062 } 2063 2064 out: 2065 rcu_read_unlock(); 2066 consume_skb(skb); 2067 return NETDEV_TX_OK; 2068 } 2069 #endif 2070 2071 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb) 2072 { 2073 struct vxlan_dev *vxlan = netdev_priv(dev); 2074 struct neighbour *n; 2075 2076 if (is_multicast_ether_addr(eth_hdr(skb)->h_dest)) 2077 return false; 2078 2079 n = NULL; 2080 switch (ntohs(eth_hdr(skb)->h_proto)) { 2081 case ETH_P_IP: 2082 { 2083 struct iphdr *pip; 2084 2085 if (!pskb_may_pull(skb, sizeof(struct iphdr))) 2086 return false; 2087 pip = ip_hdr(skb); 2088 n = neigh_lookup(&arp_tbl, &pip->daddr, dev); 2089 if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) { 2090 union vxlan_addr ipa = { 2091 .sin.sin_addr.s_addr = pip->daddr, 2092 .sin.sin_family = AF_INET, 2093 }; 2094 2095 vxlan_ip_miss(dev, &ipa); 2096 return false; 2097 } 2098 2099 break; 2100 } 2101 #if IS_ENABLED(CONFIG_IPV6) 2102 case ETH_P_IPV6: 2103 { 2104 struct ipv6hdr *pip6; 2105 2106 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 2107 return false; 2108 pip6 = ipv6_hdr(skb); 2109 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev); 2110 if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) { 2111 union vxlan_addr ipa = { 2112 .sin6.sin6_addr = pip6->daddr, 2113 .sin6.sin6_family = AF_INET6, 2114 }; 2115 2116 vxlan_ip_miss(dev, &ipa); 2117 return false; 2118 } 2119 2120 break; 2121 } 2122 #endif 2123 default: 2124 return false; 2125 } 2126 2127 if (n) { 2128 bool diff; 2129 2130 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha); 2131 if (diff) { 2132 memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest, 2133 dev->addr_len); 2134 memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len); 2135 } 2136 neigh_release(n); 2137 return diff; 2138 } 2139 2140 return false; 2141 } 2142 2143 static int vxlan_build_gpe_hdr(struct vxlanhdr *vxh, __be16 protocol) 2144 { 2145 struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)vxh; 2146 2147 gpe->np_applied = 1; 2148 gpe->next_protocol = tun_p_from_eth_p(protocol); 2149 if (!gpe->next_protocol) 2150 return -EPFNOSUPPORT; 2151 return 0; 2152 } 2153 2154 static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst, 2155 int iphdr_len, __be32 vni, 2156 struct vxlan_metadata *md, u32 vxflags, 2157 bool udp_sum) 2158 { 2159 struct vxlanhdr *vxh; 2160 int min_headroom; 2161 int err; 2162 int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL; 2163 __be16 inner_protocol = htons(ETH_P_TEB); 2164 2165 if ((vxflags & VXLAN_F_REMCSUM_TX) && 2166 skb->ip_summed == CHECKSUM_PARTIAL) { 2167 int csum_start = skb_checksum_start_offset(skb); 2168 2169 if (csum_start <= VXLAN_MAX_REMCSUM_START && 2170 !(csum_start & VXLAN_RCO_SHIFT_MASK) && 2171 (skb->csum_offset == offsetof(struct udphdr, check) || 2172 skb->csum_offset == offsetof(struct tcphdr, check))) 2173 type |= SKB_GSO_TUNNEL_REMCSUM; 2174 } 2175 2176 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len 2177 + VXLAN_HLEN + iphdr_len; 2178 2179 /* Need space for new headers (invalidates iph ptr) */ 2180 err = skb_cow_head(skb, min_headroom); 2181 if (unlikely(err)) 2182 return err; 2183 2184 err = iptunnel_handle_offloads(skb, type); 2185 if (err) 2186 return err; 2187 2188 vxh = __skb_push(skb, sizeof(*vxh)); 2189 vxh->vx_flags = VXLAN_HF_VNI; 2190 vxh->vx_vni = vxlan_vni_field(vni); 2191 2192 if (type & SKB_GSO_TUNNEL_REMCSUM) { 2193 unsigned int start; 2194 2195 start = skb_checksum_start_offset(skb) - sizeof(struct vxlanhdr); 2196 vxh->vx_vni |= vxlan_compute_rco(start, skb->csum_offset); 2197 vxh->vx_flags |= VXLAN_HF_RCO; 2198 2199 if (!skb_is_gso(skb)) { 2200 skb->ip_summed = CHECKSUM_NONE; 2201 skb->encapsulation = 0; 2202 } 2203 } 2204 2205 if (vxflags & VXLAN_F_GBP) 2206 vxlan_build_gbp_hdr(vxh, md); 2207 if (vxflags & VXLAN_F_GPE) { 2208 err = vxlan_build_gpe_hdr(vxh, skb->protocol); 2209 if (err < 0) 2210 return err; 2211 inner_protocol = skb->protocol; 2212 } 2213 2214 skb_set_inner_protocol(skb, inner_protocol); 2215 return 0; 2216 } 2217 2218 /* Bypass encapsulation if the destination is local */ 2219 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan, 2220 struct vxlan_dev *dst_vxlan, __be32 vni, 2221 bool snoop) 2222 { 2223 union vxlan_addr loopback; 2224 union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip; 2225 struct net_device *dev; 2226 int len = skb->len; 2227 2228 skb->pkt_type = PACKET_HOST; 2229 skb->encapsulation = 0; 2230 skb->dev = dst_vxlan->dev; 2231 __skb_pull(skb, skb_network_offset(skb)); 2232 2233 if (remote_ip->sa.sa_family == AF_INET) { 2234 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK); 2235 loopback.sa.sa_family = AF_INET; 2236 #if IS_ENABLED(CONFIG_IPV6) 2237 } else { 2238 loopback.sin6.sin6_addr = in6addr_loopback; 2239 loopback.sa.sa_family = AF_INET6; 2240 #endif 2241 } 2242 2243 rcu_read_lock(); 2244 dev = skb->dev; 2245 if (unlikely(!(dev->flags & IFF_UP))) { 2246 kfree_skb(skb); 2247 goto drop; 2248 } 2249 2250 if ((dst_vxlan->cfg.flags & VXLAN_F_LEARN) && snoop) 2251 vxlan_snoop(dev, &loopback, eth_hdr(skb)->h_source, 0, vni); 2252 2253 dev_sw_netstats_tx_add(src_vxlan->dev, 1, len); 2254 vxlan_vnifilter_count(src_vxlan, vni, NULL, VXLAN_VNI_STATS_TX, len); 2255 2256 if (__netif_rx(skb) == NET_RX_SUCCESS) { 2257 dev_sw_netstats_rx_add(dst_vxlan->dev, len); 2258 vxlan_vnifilter_count(dst_vxlan, vni, NULL, VXLAN_VNI_STATS_RX, 2259 len); 2260 } else { 2261 drop: 2262 dev->stats.rx_dropped++; 2263 vxlan_vnifilter_count(dst_vxlan, vni, NULL, 2264 VXLAN_VNI_STATS_RX_DROPS, 0); 2265 } 2266 rcu_read_unlock(); 2267 } 2268 2269 static int encap_bypass_if_local(struct sk_buff *skb, struct net_device *dev, 2270 struct vxlan_dev *vxlan, 2271 int addr_family, 2272 __be16 dst_port, int dst_ifindex, __be32 vni, 2273 struct dst_entry *dst, 2274 u32 rt_flags) 2275 { 2276 #if IS_ENABLED(CONFIG_IPV6) 2277 /* IPv6 rt-flags are checked against RTF_LOCAL, but the value of 2278 * RTF_LOCAL is equal to RTCF_LOCAL. So to keep code simple 2279 * we can use RTCF_LOCAL which works for ipv4 and ipv6 route entry. 2280 */ 2281 BUILD_BUG_ON(RTCF_LOCAL != RTF_LOCAL); 2282 #endif 2283 /* Bypass encapsulation if the destination is local */ 2284 if (rt_flags & RTCF_LOCAL && 2285 !(rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST)) && 2286 vxlan->cfg.flags & VXLAN_F_LOCALBYPASS) { 2287 struct vxlan_dev *dst_vxlan; 2288 2289 dst_release(dst); 2290 dst_vxlan = vxlan_find_vni(vxlan->net, dst_ifindex, vni, 2291 addr_family, dst_port, 2292 vxlan->cfg.flags); 2293 if (!dst_vxlan) { 2294 dev->stats.tx_errors++; 2295 vxlan_vnifilter_count(vxlan, vni, NULL, 2296 VXLAN_VNI_STATS_TX_ERRORS, 0); 2297 kfree_skb(skb); 2298 2299 return -ENOENT; 2300 } 2301 vxlan_encap_bypass(skb, vxlan, dst_vxlan, vni, true); 2302 return 1; 2303 } 2304 2305 return 0; 2306 } 2307 2308 void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev, 2309 __be32 default_vni, struct vxlan_rdst *rdst, bool did_rsc) 2310 { 2311 struct dst_cache *dst_cache; 2312 struct ip_tunnel_info *info; 2313 struct ip_tunnel_key *pkey; 2314 struct ip_tunnel_key key; 2315 struct vxlan_dev *vxlan = netdev_priv(dev); 2316 const struct iphdr *old_iph = ip_hdr(skb); 2317 struct vxlan_metadata _md; 2318 struct vxlan_metadata *md = &_md; 2319 unsigned int pkt_len = skb->len; 2320 __be16 src_port = 0, dst_port; 2321 struct dst_entry *ndst = NULL; 2322 int addr_family; 2323 __u8 tos, ttl; 2324 int ifindex; 2325 int err; 2326 u32 flags = vxlan->cfg.flags; 2327 bool use_cache; 2328 bool udp_sum = false; 2329 bool xnet = !net_eq(vxlan->net, dev_net(vxlan->dev)); 2330 __be32 vni = 0; 2331 2332 info = skb_tunnel_info(skb); 2333 use_cache = ip_tunnel_dst_cache_usable(skb, info); 2334 2335 if (rdst) { 2336 memset(&key, 0, sizeof(key)); 2337 pkey = &key; 2338 2339 if (vxlan_addr_any(&rdst->remote_ip)) { 2340 if (did_rsc) { 2341 /* short-circuited back to local bridge */ 2342 vxlan_encap_bypass(skb, vxlan, vxlan, 2343 default_vni, true); 2344 return; 2345 } 2346 goto drop; 2347 } 2348 2349 addr_family = vxlan->cfg.saddr.sa.sa_family; 2350 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port; 2351 vni = (rdst->remote_vni) ? : default_vni; 2352 ifindex = rdst->remote_ifindex; 2353 2354 if (addr_family == AF_INET) { 2355 key.u.ipv4.src = vxlan->cfg.saddr.sin.sin_addr.s_addr; 2356 key.u.ipv4.dst = rdst->remote_ip.sin.sin_addr.s_addr; 2357 } else { 2358 key.u.ipv6.src = vxlan->cfg.saddr.sin6.sin6_addr; 2359 key.u.ipv6.dst = rdst->remote_ip.sin6.sin6_addr; 2360 } 2361 2362 dst_cache = &rdst->dst_cache; 2363 md->gbp = skb->mark; 2364 if (flags & VXLAN_F_TTL_INHERIT) { 2365 ttl = ip_tunnel_get_ttl(old_iph, skb); 2366 } else { 2367 ttl = vxlan->cfg.ttl; 2368 if (!ttl && vxlan_addr_multicast(&rdst->remote_ip)) 2369 ttl = 1; 2370 } 2371 tos = vxlan->cfg.tos; 2372 if (tos == 1) 2373 tos = ip_tunnel_get_dsfield(old_iph, skb); 2374 if (tos && !info) 2375 use_cache = false; 2376 2377 if (addr_family == AF_INET) 2378 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM_TX); 2379 else 2380 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX); 2381 #if IS_ENABLED(CONFIG_IPV6) 2382 key.label = vxlan->cfg.label; 2383 #endif 2384 } else { 2385 if (!info) { 2386 WARN_ONCE(1, "%s: Missing encapsulation instructions\n", 2387 dev->name); 2388 goto drop; 2389 } 2390 pkey = &info->key; 2391 addr_family = ip_tunnel_info_af(info); 2392 dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port; 2393 vni = tunnel_id_to_key32(info->key.tun_id); 2394 ifindex = 0; 2395 dst_cache = &info->dst_cache; 2396 if (info->key.tun_flags & TUNNEL_VXLAN_OPT) { 2397 if (info->options_len < sizeof(*md)) 2398 goto drop; 2399 md = ip_tunnel_info_opts(info); 2400 } 2401 ttl = info->key.ttl; 2402 tos = info->key.tos; 2403 udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM); 2404 } 2405 src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min, 2406 vxlan->cfg.port_max, true); 2407 2408 rcu_read_lock(); 2409 if (addr_family == AF_INET) { 2410 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock); 2411 struct rtable *rt; 2412 __be16 df = 0; 2413 __be32 saddr; 2414 2415 if (!ifindex) 2416 ifindex = sock4->sock->sk->sk_bound_dev_if; 2417 2418 rt = udp_tunnel_dst_lookup(skb, dev, vxlan->net, ifindex, 2419 &saddr, pkey, src_port, dst_port, 2420 tos, use_cache ? dst_cache : NULL); 2421 if (IS_ERR(rt)) { 2422 err = PTR_ERR(rt); 2423 goto tx_error; 2424 } 2425 2426 if (!info) { 2427 /* Bypass encapsulation if the destination is local */ 2428 err = encap_bypass_if_local(skb, dev, vxlan, AF_INET, 2429 dst_port, ifindex, vni, 2430 &rt->dst, rt->rt_flags); 2431 if (err) 2432 goto out_unlock; 2433 2434 if (vxlan->cfg.df == VXLAN_DF_SET) { 2435 df = htons(IP_DF); 2436 } else if (vxlan->cfg.df == VXLAN_DF_INHERIT) { 2437 struct ethhdr *eth = eth_hdr(skb); 2438 2439 if (ntohs(eth->h_proto) == ETH_P_IPV6 || 2440 (ntohs(eth->h_proto) == ETH_P_IP && 2441 old_iph->frag_off & htons(IP_DF))) 2442 df = htons(IP_DF); 2443 } 2444 } else if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT) { 2445 df = htons(IP_DF); 2446 } 2447 2448 ndst = &rt->dst; 2449 err = skb_tunnel_check_pmtu(skb, ndst, vxlan_headroom(flags & VXLAN_F_GPE), 2450 netif_is_any_bridge_port(dev)); 2451 if (err < 0) { 2452 goto tx_error; 2453 } else if (err) { 2454 if (info) { 2455 struct ip_tunnel_info *unclone; 2456 2457 unclone = skb_tunnel_info_unclone(skb); 2458 if (unlikely(!unclone)) 2459 goto tx_error; 2460 2461 unclone->key.u.ipv4.src = pkey->u.ipv4.dst; 2462 unclone->key.u.ipv4.dst = saddr; 2463 } 2464 vxlan_encap_bypass(skb, vxlan, vxlan, vni, false); 2465 dst_release(ndst); 2466 goto out_unlock; 2467 } 2468 2469 tos = ip_tunnel_ecn_encap(tos, old_iph, skb); 2470 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst); 2471 err = vxlan_build_skb(skb, ndst, sizeof(struct iphdr), 2472 vni, md, flags, udp_sum); 2473 if (err < 0) 2474 goto tx_error; 2475 2476 udp_tunnel_xmit_skb(rt, sock4->sock->sk, skb, saddr, 2477 pkey->u.ipv4.dst, tos, ttl, df, 2478 src_port, dst_port, xnet, !udp_sum); 2479 #if IS_ENABLED(CONFIG_IPV6) 2480 } else { 2481 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock); 2482 struct in6_addr saddr; 2483 2484 if (!ifindex) 2485 ifindex = sock6->sock->sk->sk_bound_dev_if; 2486 2487 ndst = udp_tunnel6_dst_lookup(skb, dev, vxlan->net, sock6->sock, 2488 ifindex, &saddr, pkey, 2489 src_port, dst_port, tos, 2490 use_cache ? dst_cache : NULL); 2491 if (IS_ERR(ndst)) { 2492 err = PTR_ERR(ndst); 2493 ndst = NULL; 2494 goto tx_error; 2495 } 2496 2497 if (!info) { 2498 u32 rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags; 2499 2500 err = encap_bypass_if_local(skb, dev, vxlan, AF_INET6, 2501 dst_port, ifindex, vni, 2502 ndst, rt6i_flags); 2503 if (err) 2504 goto out_unlock; 2505 } 2506 2507 err = skb_tunnel_check_pmtu(skb, ndst, 2508 vxlan_headroom((flags & VXLAN_F_GPE) | VXLAN_F_IPV6), 2509 netif_is_any_bridge_port(dev)); 2510 if (err < 0) { 2511 goto tx_error; 2512 } else if (err) { 2513 if (info) { 2514 struct ip_tunnel_info *unclone; 2515 2516 unclone = skb_tunnel_info_unclone(skb); 2517 if (unlikely(!unclone)) 2518 goto tx_error; 2519 2520 unclone->key.u.ipv6.src = pkey->u.ipv6.dst; 2521 unclone->key.u.ipv6.dst = saddr; 2522 } 2523 2524 vxlan_encap_bypass(skb, vxlan, vxlan, vni, false); 2525 dst_release(ndst); 2526 goto out_unlock; 2527 } 2528 2529 tos = ip_tunnel_ecn_encap(tos, old_iph, skb); 2530 ttl = ttl ? : ip6_dst_hoplimit(ndst); 2531 skb_scrub_packet(skb, xnet); 2532 err = vxlan_build_skb(skb, ndst, sizeof(struct ipv6hdr), 2533 vni, md, flags, udp_sum); 2534 if (err < 0) 2535 goto tx_error; 2536 2537 udp_tunnel6_xmit_skb(ndst, sock6->sock->sk, skb, dev, 2538 &saddr, &pkey->u.ipv6.dst, tos, ttl, 2539 pkey->label, src_port, dst_port, !udp_sum); 2540 #endif 2541 } 2542 vxlan_vnifilter_count(vxlan, vni, NULL, VXLAN_VNI_STATS_TX, pkt_len); 2543 out_unlock: 2544 rcu_read_unlock(); 2545 return; 2546 2547 drop: 2548 dev->stats.tx_dropped++; 2549 vxlan_vnifilter_count(vxlan, vni, NULL, VXLAN_VNI_STATS_TX_DROPS, 0); 2550 dev_kfree_skb(skb); 2551 return; 2552 2553 tx_error: 2554 rcu_read_unlock(); 2555 if (err == -ELOOP) 2556 dev->stats.collisions++; 2557 else if (err == -ENETUNREACH) 2558 dev->stats.tx_carrier_errors++; 2559 dst_release(ndst); 2560 dev->stats.tx_errors++; 2561 vxlan_vnifilter_count(vxlan, vni, NULL, VXLAN_VNI_STATS_TX_ERRORS, 0); 2562 kfree_skb(skb); 2563 } 2564 2565 static void vxlan_xmit_nh(struct sk_buff *skb, struct net_device *dev, 2566 struct vxlan_fdb *f, __be32 vni, bool did_rsc) 2567 { 2568 struct vxlan_rdst nh_rdst; 2569 struct nexthop *nh; 2570 bool do_xmit; 2571 u32 hash; 2572 2573 memset(&nh_rdst, 0, sizeof(struct vxlan_rdst)); 2574 hash = skb_get_hash(skb); 2575 2576 rcu_read_lock(); 2577 nh = rcu_dereference(f->nh); 2578 if (!nh) { 2579 rcu_read_unlock(); 2580 goto drop; 2581 } 2582 do_xmit = vxlan_fdb_nh_path_select(nh, hash, &nh_rdst); 2583 rcu_read_unlock(); 2584 2585 if (likely(do_xmit)) 2586 vxlan_xmit_one(skb, dev, vni, &nh_rdst, did_rsc); 2587 else 2588 goto drop; 2589 2590 return; 2591 2592 drop: 2593 dev->stats.tx_dropped++; 2594 vxlan_vnifilter_count(netdev_priv(dev), vni, NULL, 2595 VXLAN_VNI_STATS_TX_DROPS, 0); 2596 dev_kfree_skb(skb); 2597 } 2598 2599 static netdev_tx_t vxlan_xmit_nhid(struct sk_buff *skb, struct net_device *dev, 2600 u32 nhid, __be32 vni) 2601 { 2602 struct vxlan_dev *vxlan = netdev_priv(dev); 2603 struct vxlan_rdst nh_rdst; 2604 struct nexthop *nh; 2605 bool do_xmit; 2606 u32 hash; 2607 2608 memset(&nh_rdst, 0, sizeof(struct vxlan_rdst)); 2609 hash = skb_get_hash(skb); 2610 2611 rcu_read_lock(); 2612 nh = nexthop_find_by_id(dev_net(dev), nhid); 2613 if (unlikely(!nh || !nexthop_is_fdb(nh) || !nexthop_is_multipath(nh))) { 2614 rcu_read_unlock(); 2615 goto drop; 2616 } 2617 do_xmit = vxlan_fdb_nh_path_select(nh, hash, &nh_rdst); 2618 rcu_read_unlock(); 2619 2620 if (vxlan->cfg.saddr.sa.sa_family != nh_rdst.remote_ip.sa.sa_family) 2621 goto drop; 2622 2623 if (likely(do_xmit)) 2624 vxlan_xmit_one(skb, dev, vni, &nh_rdst, false); 2625 else 2626 goto drop; 2627 2628 return NETDEV_TX_OK; 2629 2630 drop: 2631 dev->stats.tx_dropped++; 2632 vxlan_vnifilter_count(netdev_priv(dev), vni, NULL, 2633 VXLAN_VNI_STATS_TX_DROPS, 0); 2634 dev_kfree_skb(skb); 2635 return NETDEV_TX_OK; 2636 } 2637 2638 /* Transmit local packets over Vxlan 2639 * 2640 * Outer IP header inherits ECN and DF from inner header. 2641 * Outer UDP destination is the VXLAN assigned port. 2642 * source port is based on hash of flow 2643 */ 2644 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev) 2645 { 2646 struct vxlan_dev *vxlan = netdev_priv(dev); 2647 struct vxlan_rdst *rdst, *fdst = NULL; 2648 const struct ip_tunnel_info *info; 2649 bool did_rsc = false; 2650 struct vxlan_fdb *f; 2651 struct ethhdr *eth; 2652 __be32 vni = 0; 2653 u32 nhid = 0; 2654 2655 info = skb_tunnel_info(skb); 2656 2657 skb_reset_mac_header(skb); 2658 2659 if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) { 2660 if (info && info->mode & IP_TUNNEL_INFO_BRIDGE && 2661 info->mode & IP_TUNNEL_INFO_TX) { 2662 vni = tunnel_id_to_key32(info->key.tun_id); 2663 nhid = info->key.nhid; 2664 } else { 2665 if (info && info->mode & IP_TUNNEL_INFO_TX) 2666 vxlan_xmit_one(skb, dev, vni, NULL, false); 2667 else 2668 kfree_skb(skb); 2669 return NETDEV_TX_OK; 2670 } 2671 } 2672 2673 if (vxlan->cfg.flags & VXLAN_F_PROXY) { 2674 eth = eth_hdr(skb); 2675 if (ntohs(eth->h_proto) == ETH_P_ARP) 2676 return arp_reduce(dev, skb, vni); 2677 #if IS_ENABLED(CONFIG_IPV6) 2678 else if (ntohs(eth->h_proto) == ETH_P_IPV6 && 2679 pskb_may_pull(skb, sizeof(struct ipv6hdr) + 2680 sizeof(struct nd_msg)) && 2681 ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) { 2682 struct nd_msg *m = (struct nd_msg *)(ipv6_hdr(skb) + 1); 2683 2684 if (m->icmph.icmp6_code == 0 && 2685 m->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION) 2686 return neigh_reduce(dev, skb, vni); 2687 } 2688 #endif 2689 } 2690 2691 if (nhid) 2692 return vxlan_xmit_nhid(skb, dev, nhid, vni); 2693 2694 if (vxlan->cfg.flags & VXLAN_F_MDB) { 2695 struct vxlan_mdb_entry *mdb_entry; 2696 2697 rcu_read_lock(); 2698 mdb_entry = vxlan_mdb_entry_skb_get(vxlan, skb, vni); 2699 if (mdb_entry) { 2700 netdev_tx_t ret; 2701 2702 ret = vxlan_mdb_xmit(vxlan, mdb_entry, skb); 2703 rcu_read_unlock(); 2704 return ret; 2705 } 2706 rcu_read_unlock(); 2707 } 2708 2709 eth = eth_hdr(skb); 2710 f = vxlan_find_mac(vxlan, eth->h_dest, vni); 2711 did_rsc = false; 2712 2713 if (f && (f->flags & NTF_ROUTER) && (vxlan->cfg.flags & VXLAN_F_RSC) && 2714 (ntohs(eth->h_proto) == ETH_P_IP || 2715 ntohs(eth->h_proto) == ETH_P_IPV6)) { 2716 did_rsc = route_shortcircuit(dev, skb); 2717 if (did_rsc) 2718 f = vxlan_find_mac(vxlan, eth->h_dest, vni); 2719 } 2720 2721 if (f == NULL) { 2722 f = vxlan_find_mac(vxlan, all_zeros_mac, vni); 2723 if (f == NULL) { 2724 if ((vxlan->cfg.flags & VXLAN_F_L2MISS) && 2725 !is_multicast_ether_addr(eth->h_dest)) 2726 vxlan_fdb_miss(vxlan, eth->h_dest); 2727 2728 dev->stats.tx_dropped++; 2729 vxlan_vnifilter_count(vxlan, vni, NULL, 2730 VXLAN_VNI_STATS_TX_DROPS, 0); 2731 kfree_skb(skb); 2732 return NETDEV_TX_OK; 2733 } 2734 } 2735 2736 if (rcu_access_pointer(f->nh)) { 2737 vxlan_xmit_nh(skb, dev, f, 2738 (vni ? : vxlan->default_dst.remote_vni), did_rsc); 2739 } else { 2740 list_for_each_entry_rcu(rdst, &f->remotes, list) { 2741 struct sk_buff *skb1; 2742 2743 if (!fdst) { 2744 fdst = rdst; 2745 continue; 2746 } 2747 skb1 = skb_clone(skb, GFP_ATOMIC); 2748 if (skb1) 2749 vxlan_xmit_one(skb1, dev, vni, rdst, did_rsc); 2750 } 2751 if (fdst) 2752 vxlan_xmit_one(skb, dev, vni, fdst, did_rsc); 2753 else 2754 kfree_skb(skb); 2755 } 2756 2757 return NETDEV_TX_OK; 2758 } 2759 2760 /* Walk the forwarding table and purge stale entries */ 2761 static void vxlan_cleanup(struct timer_list *t) 2762 { 2763 struct vxlan_dev *vxlan = from_timer(vxlan, t, age_timer); 2764 unsigned long next_timer = jiffies + FDB_AGE_INTERVAL; 2765 unsigned int h; 2766 2767 if (!netif_running(vxlan->dev)) 2768 return; 2769 2770 for (h = 0; h < FDB_HASH_SIZE; ++h) { 2771 struct hlist_node *p, *n; 2772 2773 spin_lock(&vxlan->hash_lock[h]); 2774 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) { 2775 struct vxlan_fdb *f 2776 = container_of(p, struct vxlan_fdb, hlist); 2777 unsigned long timeout; 2778 2779 if (f->state & (NUD_PERMANENT | NUD_NOARP)) 2780 continue; 2781 2782 if (f->flags & NTF_EXT_LEARNED) 2783 continue; 2784 2785 timeout = f->used + vxlan->cfg.age_interval * HZ; 2786 if (time_before_eq(timeout, jiffies)) { 2787 netdev_dbg(vxlan->dev, 2788 "garbage collect %pM\n", 2789 f->eth_addr); 2790 f->state = NUD_STALE; 2791 vxlan_fdb_destroy(vxlan, f, true, true); 2792 } else if (time_before(timeout, next_timer)) 2793 next_timer = timeout; 2794 } 2795 spin_unlock(&vxlan->hash_lock[h]); 2796 } 2797 2798 mod_timer(&vxlan->age_timer, next_timer); 2799 } 2800 2801 static void vxlan_vs_del_dev(struct vxlan_dev *vxlan) 2802 { 2803 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id); 2804 2805 spin_lock(&vn->sock_lock); 2806 hlist_del_init_rcu(&vxlan->hlist4.hlist); 2807 #if IS_ENABLED(CONFIG_IPV6) 2808 hlist_del_init_rcu(&vxlan->hlist6.hlist); 2809 #endif 2810 spin_unlock(&vn->sock_lock); 2811 } 2812 2813 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan, 2814 struct vxlan_dev_node *node) 2815 { 2816 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id); 2817 __be32 vni = vxlan->default_dst.remote_vni; 2818 2819 node->vxlan = vxlan; 2820 spin_lock(&vn->sock_lock); 2821 hlist_add_head_rcu(&node->hlist, vni_head(vs, vni)); 2822 spin_unlock(&vn->sock_lock); 2823 } 2824 2825 /* Setup stats when device is created */ 2826 static int vxlan_init(struct net_device *dev) 2827 { 2828 struct vxlan_dev *vxlan = netdev_priv(dev); 2829 int err; 2830 2831 if (vxlan->cfg.flags & VXLAN_F_VNIFILTER) 2832 vxlan_vnigroup_init(vxlan); 2833 2834 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 2835 if (!dev->tstats) { 2836 err = -ENOMEM; 2837 goto err_vnigroup_uninit; 2838 } 2839 2840 err = gro_cells_init(&vxlan->gro_cells, dev); 2841 if (err) 2842 goto err_free_percpu; 2843 2844 err = vxlan_mdb_init(vxlan); 2845 if (err) 2846 goto err_gro_cells_destroy; 2847 2848 return 0; 2849 2850 err_gro_cells_destroy: 2851 gro_cells_destroy(&vxlan->gro_cells); 2852 err_free_percpu: 2853 free_percpu(dev->tstats); 2854 err_vnigroup_uninit: 2855 if (vxlan->cfg.flags & VXLAN_F_VNIFILTER) 2856 vxlan_vnigroup_uninit(vxlan); 2857 return err; 2858 } 2859 2860 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan, __be32 vni) 2861 { 2862 struct vxlan_fdb *f; 2863 u32 hash_index = fdb_head_index(vxlan, all_zeros_mac, vni); 2864 2865 spin_lock_bh(&vxlan->hash_lock[hash_index]); 2866 f = __vxlan_find_mac(vxlan, all_zeros_mac, vni); 2867 if (f) 2868 vxlan_fdb_destroy(vxlan, f, true, true); 2869 spin_unlock_bh(&vxlan->hash_lock[hash_index]); 2870 } 2871 2872 static void vxlan_uninit(struct net_device *dev) 2873 { 2874 struct vxlan_dev *vxlan = netdev_priv(dev); 2875 2876 vxlan_mdb_fini(vxlan); 2877 2878 if (vxlan->cfg.flags & VXLAN_F_VNIFILTER) 2879 vxlan_vnigroup_uninit(vxlan); 2880 2881 gro_cells_destroy(&vxlan->gro_cells); 2882 2883 vxlan_fdb_delete_default(vxlan, vxlan->cfg.vni); 2884 2885 free_percpu(dev->tstats); 2886 } 2887 2888 /* Start ageing timer and join group when device is brought up */ 2889 static int vxlan_open(struct net_device *dev) 2890 { 2891 struct vxlan_dev *vxlan = netdev_priv(dev); 2892 int ret; 2893 2894 ret = vxlan_sock_add(vxlan); 2895 if (ret < 0) 2896 return ret; 2897 2898 ret = vxlan_multicast_join(vxlan); 2899 if (ret) { 2900 vxlan_sock_release(vxlan); 2901 return ret; 2902 } 2903 2904 if (vxlan->cfg.age_interval) 2905 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL); 2906 2907 return ret; 2908 } 2909 2910 struct vxlan_fdb_flush_desc { 2911 bool ignore_default_entry; 2912 unsigned long state; 2913 unsigned long state_mask; 2914 unsigned long flags; 2915 unsigned long flags_mask; 2916 __be32 src_vni; 2917 u32 nhid; 2918 __be32 vni; 2919 __be16 port; 2920 union vxlan_addr dst_ip; 2921 }; 2922 2923 static bool vxlan_fdb_is_default_entry(const struct vxlan_fdb *f, 2924 const struct vxlan_dev *vxlan) 2925 { 2926 return is_zero_ether_addr(f->eth_addr) && f->vni == vxlan->cfg.vni; 2927 } 2928 2929 static bool vxlan_fdb_nhid_matches(const struct vxlan_fdb *f, u32 nhid) 2930 { 2931 struct nexthop *nh = rtnl_dereference(f->nh); 2932 2933 return nh && nh->id == nhid; 2934 } 2935 2936 static bool vxlan_fdb_flush_matches(const struct vxlan_fdb *f, 2937 const struct vxlan_dev *vxlan, 2938 const struct vxlan_fdb_flush_desc *desc) 2939 { 2940 if (desc->state_mask && (f->state & desc->state_mask) != desc->state) 2941 return false; 2942 2943 if (desc->flags_mask && (f->flags & desc->flags_mask) != desc->flags) 2944 return false; 2945 2946 if (desc->ignore_default_entry && vxlan_fdb_is_default_entry(f, vxlan)) 2947 return false; 2948 2949 if (desc->src_vni && f->vni != desc->src_vni) 2950 return false; 2951 2952 if (desc->nhid && !vxlan_fdb_nhid_matches(f, desc->nhid)) 2953 return false; 2954 2955 return true; 2956 } 2957 2958 static bool 2959 vxlan_fdb_flush_should_match_remotes(const struct vxlan_fdb_flush_desc *desc) 2960 { 2961 return desc->vni || desc->port || desc->dst_ip.sa.sa_family; 2962 } 2963 2964 static bool 2965 vxlan_fdb_flush_remote_matches(const struct vxlan_fdb_flush_desc *desc, 2966 const struct vxlan_rdst *rd) 2967 { 2968 if (desc->vni && rd->remote_vni != desc->vni) 2969 return false; 2970 2971 if (desc->port && rd->remote_port != desc->port) 2972 return false; 2973 2974 if (desc->dst_ip.sa.sa_family && 2975 !vxlan_addr_equal(&rd->remote_ip, &desc->dst_ip)) 2976 return false; 2977 2978 return true; 2979 } 2980 2981 static void 2982 vxlan_fdb_flush_match_remotes(struct vxlan_fdb *f, struct vxlan_dev *vxlan, 2983 const struct vxlan_fdb_flush_desc *desc, 2984 bool *p_destroy_fdb) 2985 { 2986 bool remotes_flushed = false; 2987 struct vxlan_rdst *rd, *tmp; 2988 2989 list_for_each_entry_safe(rd, tmp, &f->remotes, list) { 2990 if (!vxlan_fdb_flush_remote_matches(desc, rd)) 2991 continue; 2992 2993 vxlan_fdb_dst_destroy(vxlan, f, rd, true); 2994 remotes_flushed = true; 2995 } 2996 2997 *p_destroy_fdb = remotes_flushed && list_empty(&f->remotes); 2998 } 2999 3000 /* Purge the forwarding table */ 3001 static void vxlan_flush(struct vxlan_dev *vxlan, 3002 const struct vxlan_fdb_flush_desc *desc) 3003 { 3004 bool match_remotes = vxlan_fdb_flush_should_match_remotes(desc); 3005 unsigned int h; 3006 3007 for (h = 0; h < FDB_HASH_SIZE; ++h) { 3008 struct hlist_node *p, *n; 3009 3010 spin_lock_bh(&vxlan->hash_lock[h]); 3011 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) { 3012 struct vxlan_fdb *f 3013 = container_of(p, struct vxlan_fdb, hlist); 3014 3015 if (!vxlan_fdb_flush_matches(f, vxlan, desc)) 3016 continue; 3017 3018 if (match_remotes) { 3019 bool destroy_fdb = false; 3020 3021 vxlan_fdb_flush_match_remotes(f, vxlan, desc, 3022 &destroy_fdb); 3023 3024 if (!destroy_fdb) 3025 continue; 3026 } 3027 3028 vxlan_fdb_destroy(vxlan, f, true, true); 3029 } 3030 spin_unlock_bh(&vxlan->hash_lock[h]); 3031 } 3032 } 3033 3034 static const struct nla_policy vxlan_del_bulk_policy[NDA_MAX + 1] = { 3035 [NDA_SRC_VNI] = { .type = NLA_U32 }, 3036 [NDA_NH_ID] = { .type = NLA_U32 }, 3037 [NDA_VNI] = { .type = NLA_U32 }, 3038 [NDA_PORT] = { .type = NLA_U16 }, 3039 [NDA_DST] = NLA_POLICY_RANGE(NLA_BINARY, sizeof(struct in_addr), 3040 sizeof(struct in6_addr)), 3041 [NDA_NDM_STATE_MASK] = { .type = NLA_U16 }, 3042 [NDA_NDM_FLAGS_MASK] = { .type = NLA_U8 }, 3043 }; 3044 3045 #define VXLAN_FDB_FLUSH_IGNORED_NDM_FLAGS (NTF_MASTER | NTF_SELF) 3046 #define VXLAN_FDB_FLUSH_ALLOWED_NDM_STATES (NUD_PERMANENT | NUD_NOARP) 3047 #define VXLAN_FDB_FLUSH_ALLOWED_NDM_FLAGS (NTF_EXT_LEARNED | NTF_OFFLOADED | \ 3048 NTF_ROUTER) 3049 3050 static int vxlan_fdb_delete_bulk(struct nlmsghdr *nlh, struct net_device *dev, 3051 struct netlink_ext_ack *extack) 3052 { 3053 struct vxlan_dev *vxlan = netdev_priv(dev); 3054 struct vxlan_fdb_flush_desc desc = {}; 3055 struct ndmsg *ndm = nlmsg_data(nlh); 3056 struct nlattr *tb[NDA_MAX + 1]; 3057 u8 ndm_flags; 3058 int err; 3059 3060 ndm_flags = ndm->ndm_flags & ~VXLAN_FDB_FLUSH_IGNORED_NDM_FLAGS; 3061 3062 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, vxlan_del_bulk_policy, 3063 extack); 3064 if (err) 3065 return err; 3066 3067 if (ndm_flags & ~VXLAN_FDB_FLUSH_ALLOWED_NDM_FLAGS) { 3068 NL_SET_ERR_MSG(extack, "Unsupported fdb flush ndm flag bits set"); 3069 return -EINVAL; 3070 } 3071 if (ndm->ndm_state & ~VXLAN_FDB_FLUSH_ALLOWED_NDM_STATES) { 3072 NL_SET_ERR_MSG(extack, "Unsupported fdb flush ndm state bits set"); 3073 return -EINVAL; 3074 } 3075 3076 desc.state = ndm->ndm_state; 3077 desc.flags = ndm_flags; 3078 3079 if (tb[NDA_NDM_STATE_MASK]) 3080 desc.state_mask = nla_get_u16(tb[NDA_NDM_STATE_MASK]); 3081 3082 if (tb[NDA_NDM_FLAGS_MASK]) 3083 desc.flags_mask = nla_get_u8(tb[NDA_NDM_FLAGS_MASK]); 3084 3085 if (tb[NDA_SRC_VNI]) 3086 desc.src_vni = cpu_to_be32(nla_get_u32(tb[NDA_SRC_VNI])); 3087 3088 if (tb[NDA_NH_ID]) 3089 desc.nhid = nla_get_u32(tb[NDA_NH_ID]); 3090 3091 if (tb[NDA_VNI]) 3092 desc.vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI])); 3093 3094 if (tb[NDA_PORT]) 3095 desc.port = nla_get_be16(tb[NDA_PORT]); 3096 3097 if (tb[NDA_DST]) { 3098 union vxlan_addr ip; 3099 3100 err = vxlan_nla_get_addr(&ip, tb[NDA_DST]); 3101 if (err) { 3102 NL_SET_ERR_MSG_ATTR(extack, tb[NDA_DST], 3103 "Unsupported address family"); 3104 return err; 3105 } 3106 desc.dst_ip = ip; 3107 } 3108 3109 vxlan_flush(vxlan, &desc); 3110 3111 return 0; 3112 } 3113 3114 /* Cleanup timer and forwarding table on shutdown */ 3115 static int vxlan_stop(struct net_device *dev) 3116 { 3117 struct vxlan_dev *vxlan = netdev_priv(dev); 3118 struct vxlan_fdb_flush_desc desc = { 3119 /* Default entry is deleted at vxlan_uninit. */ 3120 .ignore_default_entry = true, 3121 .state = 0, 3122 .state_mask = NUD_PERMANENT | NUD_NOARP, 3123 }; 3124 3125 vxlan_multicast_leave(vxlan); 3126 3127 del_timer_sync(&vxlan->age_timer); 3128 3129 vxlan_flush(vxlan, &desc); 3130 vxlan_sock_release(vxlan); 3131 3132 return 0; 3133 } 3134 3135 /* Stub, nothing needs to be done. */ 3136 static void vxlan_set_multicast_list(struct net_device *dev) 3137 { 3138 } 3139 3140 static int vxlan_change_mtu(struct net_device *dev, int new_mtu) 3141 { 3142 struct vxlan_dev *vxlan = netdev_priv(dev); 3143 struct vxlan_rdst *dst = &vxlan->default_dst; 3144 struct net_device *lowerdev = __dev_get_by_index(vxlan->net, 3145 dst->remote_ifindex); 3146 3147 /* This check is different than dev->max_mtu, because it looks at 3148 * the lowerdev->mtu, rather than the static dev->max_mtu 3149 */ 3150 if (lowerdev) { 3151 int max_mtu = lowerdev->mtu - vxlan_headroom(vxlan->cfg.flags); 3152 if (new_mtu > max_mtu) 3153 return -EINVAL; 3154 } 3155 3156 dev->mtu = new_mtu; 3157 return 0; 3158 } 3159 3160 static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb) 3161 { 3162 struct vxlan_dev *vxlan = netdev_priv(dev); 3163 struct ip_tunnel_info *info = skb_tunnel_info(skb); 3164 __be16 sport, dport; 3165 3166 sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min, 3167 vxlan->cfg.port_max, true); 3168 dport = info->key.tp_dst ? : vxlan->cfg.dst_port; 3169 3170 if (ip_tunnel_info_af(info) == AF_INET) { 3171 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock); 3172 struct rtable *rt; 3173 3174 if (!sock4) 3175 return -EIO; 3176 3177 rt = udp_tunnel_dst_lookup(skb, dev, vxlan->net, 0, 3178 &info->key.u.ipv4.src, 3179 &info->key, 3180 sport, dport, info->key.tos, 3181 &info->dst_cache); 3182 if (IS_ERR(rt)) 3183 return PTR_ERR(rt); 3184 ip_rt_put(rt); 3185 } else { 3186 #if IS_ENABLED(CONFIG_IPV6) 3187 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock); 3188 struct dst_entry *ndst; 3189 3190 if (!sock6) 3191 return -EIO; 3192 3193 ndst = udp_tunnel6_dst_lookup(skb, dev, vxlan->net, sock6->sock, 3194 0, &info->key.u.ipv6.src, 3195 &info->key, 3196 sport, dport, info->key.tos, 3197 &info->dst_cache); 3198 if (IS_ERR(ndst)) 3199 return PTR_ERR(ndst); 3200 dst_release(ndst); 3201 #else /* !CONFIG_IPV6 */ 3202 return -EPFNOSUPPORT; 3203 #endif 3204 } 3205 info->key.tp_src = sport; 3206 info->key.tp_dst = dport; 3207 return 0; 3208 } 3209 3210 static const struct net_device_ops vxlan_netdev_ether_ops = { 3211 .ndo_init = vxlan_init, 3212 .ndo_uninit = vxlan_uninit, 3213 .ndo_open = vxlan_open, 3214 .ndo_stop = vxlan_stop, 3215 .ndo_start_xmit = vxlan_xmit, 3216 .ndo_get_stats64 = dev_get_tstats64, 3217 .ndo_set_rx_mode = vxlan_set_multicast_list, 3218 .ndo_change_mtu = vxlan_change_mtu, 3219 .ndo_validate_addr = eth_validate_addr, 3220 .ndo_set_mac_address = eth_mac_addr, 3221 .ndo_fdb_add = vxlan_fdb_add, 3222 .ndo_fdb_del = vxlan_fdb_delete, 3223 .ndo_fdb_del_bulk = vxlan_fdb_delete_bulk, 3224 .ndo_fdb_dump = vxlan_fdb_dump, 3225 .ndo_fdb_get = vxlan_fdb_get, 3226 .ndo_mdb_add = vxlan_mdb_add, 3227 .ndo_mdb_del = vxlan_mdb_del, 3228 .ndo_mdb_dump = vxlan_mdb_dump, 3229 .ndo_mdb_get = vxlan_mdb_get, 3230 .ndo_fill_metadata_dst = vxlan_fill_metadata_dst, 3231 }; 3232 3233 static const struct net_device_ops vxlan_netdev_raw_ops = { 3234 .ndo_init = vxlan_init, 3235 .ndo_uninit = vxlan_uninit, 3236 .ndo_open = vxlan_open, 3237 .ndo_stop = vxlan_stop, 3238 .ndo_start_xmit = vxlan_xmit, 3239 .ndo_get_stats64 = dev_get_tstats64, 3240 .ndo_change_mtu = vxlan_change_mtu, 3241 .ndo_fill_metadata_dst = vxlan_fill_metadata_dst, 3242 }; 3243 3244 /* Info for udev, that this is a virtual tunnel endpoint */ 3245 static struct device_type vxlan_type = { 3246 .name = "vxlan", 3247 }; 3248 3249 /* Calls the ndo_udp_tunnel_add of the caller in order to 3250 * supply the listening VXLAN udp ports. Callers are expected 3251 * to implement the ndo_udp_tunnel_add. 3252 */ 3253 static void vxlan_offload_rx_ports(struct net_device *dev, bool push) 3254 { 3255 struct vxlan_sock *vs; 3256 struct net *net = dev_net(dev); 3257 struct vxlan_net *vn = net_generic(net, vxlan_net_id); 3258 unsigned int i; 3259 3260 spin_lock(&vn->sock_lock); 3261 for (i = 0; i < PORT_HASH_SIZE; ++i) { 3262 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) { 3263 unsigned short type; 3264 3265 if (vs->flags & VXLAN_F_GPE) 3266 type = UDP_TUNNEL_TYPE_VXLAN_GPE; 3267 else 3268 type = UDP_TUNNEL_TYPE_VXLAN; 3269 3270 if (push) 3271 udp_tunnel_push_rx_port(dev, vs->sock, type); 3272 else 3273 udp_tunnel_drop_rx_port(dev, vs->sock, type); 3274 } 3275 } 3276 spin_unlock(&vn->sock_lock); 3277 } 3278 3279 /* Initialize the device structure. */ 3280 static void vxlan_setup(struct net_device *dev) 3281 { 3282 struct vxlan_dev *vxlan = netdev_priv(dev); 3283 unsigned int h; 3284 3285 eth_hw_addr_random(dev); 3286 ether_setup(dev); 3287 3288 dev->needs_free_netdev = true; 3289 SET_NETDEV_DEVTYPE(dev, &vxlan_type); 3290 3291 dev->features |= NETIF_F_LLTX; 3292 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST; 3293 dev->features |= NETIF_F_RXCSUM; 3294 dev->features |= NETIF_F_GSO_SOFTWARE; 3295 3296 dev->vlan_features = dev->features; 3297 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST; 3298 dev->hw_features |= NETIF_F_RXCSUM; 3299 dev->hw_features |= NETIF_F_GSO_SOFTWARE; 3300 netif_keep_dst(dev); 3301 dev->priv_flags |= IFF_NO_QUEUE | IFF_CHANGE_PROTO_DOWN; 3302 3303 /* MTU range: 68 - 65535 */ 3304 dev->min_mtu = ETH_MIN_MTU; 3305 dev->max_mtu = ETH_MAX_MTU; 3306 3307 INIT_LIST_HEAD(&vxlan->next); 3308 3309 timer_setup(&vxlan->age_timer, vxlan_cleanup, TIMER_DEFERRABLE); 3310 3311 vxlan->dev = dev; 3312 3313 for (h = 0; h < FDB_HASH_SIZE; ++h) { 3314 spin_lock_init(&vxlan->hash_lock[h]); 3315 INIT_HLIST_HEAD(&vxlan->fdb_head[h]); 3316 } 3317 } 3318 3319 static void vxlan_ether_setup(struct net_device *dev) 3320 { 3321 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 3322 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 3323 dev->netdev_ops = &vxlan_netdev_ether_ops; 3324 } 3325 3326 static void vxlan_raw_setup(struct net_device *dev) 3327 { 3328 dev->header_ops = NULL; 3329 dev->type = ARPHRD_NONE; 3330 dev->hard_header_len = 0; 3331 dev->addr_len = 0; 3332 dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; 3333 dev->netdev_ops = &vxlan_netdev_raw_ops; 3334 } 3335 3336 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = { 3337 [IFLA_VXLAN_UNSPEC] = { .strict_start_type = IFLA_VXLAN_LOCALBYPASS }, 3338 [IFLA_VXLAN_ID] = { .type = NLA_U32 }, 3339 [IFLA_VXLAN_GROUP] = { .len = sizeof_field(struct iphdr, daddr) }, 3340 [IFLA_VXLAN_GROUP6] = { .len = sizeof(struct in6_addr) }, 3341 [IFLA_VXLAN_LINK] = { .type = NLA_U32 }, 3342 [IFLA_VXLAN_LOCAL] = { .len = sizeof_field(struct iphdr, saddr) }, 3343 [IFLA_VXLAN_LOCAL6] = { .len = sizeof(struct in6_addr) }, 3344 [IFLA_VXLAN_TOS] = { .type = NLA_U8 }, 3345 [IFLA_VXLAN_TTL] = { .type = NLA_U8 }, 3346 [IFLA_VXLAN_LABEL] = { .type = NLA_U32 }, 3347 [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 }, 3348 [IFLA_VXLAN_AGEING] = { .type = NLA_U32 }, 3349 [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 }, 3350 [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) }, 3351 [IFLA_VXLAN_PROXY] = { .type = NLA_U8 }, 3352 [IFLA_VXLAN_RSC] = { .type = NLA_U8 }, 3353 [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 }, 3354 [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 }, 3355 [IFLA_VXLAN_COLLECT_METADATA] = { .type = NLA_U8 }, 3356 [IFLA_VXLAN_PORT] = { .type = NLA_U16 }, 3357 [IFLA_VXLAN_UDP_CSUM] = { .type = NLA_U8 }, 3358 [IFLA_VXLAN_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 }, 3359 [IFLA_VXLAN_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 }, 3360 [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 }, 3361 [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 }, 3362 [IFLA_VXLAN_GBP] = { .type = NLA_FLAG, }, 3363 [IFLA_VXLAN_GPE] = { .type = NLA_FLAG, }, 3364 [IFLA_VXLAN_REMCSUM_NOPARTIAL] = { .type = NLA_FLAG }, 3365 [IFLA_VXLAN_TTL_INHERIT] = { .type = NLA_FLAG }, 3366 [IFLA_VXLAN_DF] = { .type = NLA_U8 }, 3367 [IFLA_VXLAN_VNIFILTER] = { .type = NLA_U8 }, 3368 [IFLA_VXLAN_LOCALBYPASS] = NLA_POLICY_MAX(NLA_U8, 1), 3369 }; 3370 3371 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[], 3372 struct netlink_ext_ack *extack) 3373 { 3374 if (tb[IFLA_ADDRESS]) { 3375 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) { 3376 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS], 3377 "Provided link layer address is not Ethernet"); 3378 return -EINVAL; 3379 } 3380 3381 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) { 3382 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS], 3383 "Provided Ethernet address is not unicast"); 3384 return -EADDRNOTAVAIL; 3385 } 3386 } 3387 3388 if (tb[IFLA_MTU]) { 3389 u32 mtu = nla_get_u32(tb[IFLA_MTU]); 3390 3391 if (mtu < ETH_MIN_MTU || mtu > ETH_MAX_MTU) { 3392 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_MTU], 3393 "MTU must be between 68 and 65535"); 3394 return -EINVAL; 3395 } 3396 } 3397 3398 if (!data) { 3399 NL_SET_ERR_MSG(extack, 3400 "Required attributes not provided to perform the operation"); 3401 return -EINVAL; 3402 } 3403 3404 if (data[IFLA_VXLAN_ID]) { 3405 u32 id = nla_get_u32(data[IFLA_VXLAN_ID]); 3406 3407 if (id >= VXLAN_N_VID) { 3408 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_ID], 3409 "VXLAN ID must be lower than 16777216"); 3410 return -ERANGE; 3411 } 3412 } 3413 3414 if (data[IFLA_VXLAN_PORT_RANGE]) { 3415 const struct ifla_vxlan_port_range *p 3416 = nla_data(data[IFLA_VXLAN_PORT_RANGE]); 3417 3418 if (ntohs(p->high) < ntohs(p->low)) { 3419 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_PORT_RANGE], 3420 "Invalid source port range"); 3421 return -EINVAL; 3422 } 3423 } 3424 3425 if (data[IFLA_VXLAN_DF]) { 3426 enum ifla_vxlan_df df = nla_get_u8(data[IFLA_VXLAN_DF]); 3427 3428 if (df < 0 || df > VXLAN_DF_MAX) { 3429 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_DF], 3430 "Invalid DF attribute"); 3431 return -EINVAL; 3432 } 3433 } 3434 3435 return 0; 3436 } 3437 3438 static void vxlan_get_drvinfo(struct net_device *netdev, 3439 struct ethtool_drvinfo *drvinfo) 3440 { 3441 strscpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version)); 3442 strscpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver)); 3443 } 3444 3445 static int vxlan_get_link_ksettings(struct net_device *dev, 3446 struct ethtool_link_ksettings *cmd) 3447 { 3448 struct vxlan_dev *vxlan = netdev_priv(dev); 3449 struct vxlan_rdst *dst = &vxlan->default_dst; 3450 struct net_device *lowerdev = __dev_get_by_index(vxlan->net, 3451 dst->remote_ifindex); 3452 3453 if (!lowerdev) { 3454 cmd->base.duplex = DUPLEX_UNKNOWN; 3455 cmd->base.port = PORT_OTHER; 3456 cmd->base.speed = SPEED_UNKNOWN; 3457 3458 return 0; 3459 } 3460 3461 return __ethtool_get_link_ksettings(lowerdev, cmd); 3462 } 3463 3464 static const struct ethtool_ops vxlan_ethtool_ops = { 3465 .get_drvinfo = vxlan_get_drvinfo, 3466 .get_link = ethtool_op_get_link, 3467 .get_link_ksettings = vxlan_get_link_ksettings, 3468 }; 3469 3470 static struct socket *vxlan_create_sock(struct net *net, bool ipv6, 3471 __be16 port, u32 flags, int ifindex) 3472 { 3473 struct socket *sock; 3474 struct udp_port_cfg udp_conf; 3475 int err; 3476 3477 memset(&udp_conf, 0, sizeof(udp_conf)); 3478 3479 if (ipv6) { 3480 udp_conf.family = AF_INET6; 3481 udp_conf.use_udp6_rx_checksums = 3482 !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX); 3483 udp_conf.ipv6_v6only = 1; 3484 } else { 3485 udp_conf.family = AF_INET; 3486 } 3487 3488 udp_conf.local_udp_port = port; 3489 udp_conf.bind_ifindex = ifindex; 3490 3491 /* Open UDP socket */ 3492 err = udp_sock_create(net, &udp_conf, &sock); 3493 if (err < 0) 3494 return ERR_PTR(err); 3495 3496 udp_allow_gso(sock->sk); 3497 return sock; 3498 } 3499 3500 /* Create new listen socket if needed */ 3501 static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6, 3502 __be16 port, u32 flags, 3503 int ifindex) 3504 { 3505 struct vxlan_net *vn = net_generic(net, vxlan_net_id); 3506 struct vxlan_sock *vs; 3507 struct socket *sock; 3508 unsigned int h; 3509 struct udp_tunnel_sock_cfg tunnel_cfg; 3510 3511 vs = kzalloc(sizeof(*vs), GFP_KERNEL); 3512 if (!vs) 3513 return ERR_PTR(-ENOMEM); 3514 3515 for (h = 0; h < VNI_HASH_SIZE; ++h) 3516 INIT_HLIST_HEAD(&vs->vni_list[h]); 3517 3518 sock = vxlan_create_sock(net, ipv6, port, flags, ifindex); 3519 if (IS_ERR(sock)) { 3520 kfree(vs); 3521 return ERR_CAST(sock); 3522 } 3523 3524 vs->sock = sock; 3525 refcount_set(&vs->refcnt, 1); 3526 vs->flags = (flags & VXLAN_F_RCV_FLAGS); 3527 3528 spin_lock(&vn->sock_lock); 3529 hlist_add_head_rcu(&vs->hlist, vs_head(net, port)); 3530 udp_tunnel_notify_add_rx_port(sock, 3531 (vs->flags & VXLAN_F_GPE) ? 3532 UDP_TUNNEL_TYPE_VXLAN_GPE : 3533 UDP_TUNNEL_TYPE_VXLAN); 3534 spin_unlock(&vn->sock_lock); 3535 3536 /* Mark socket as an encapsulation socket. */ 3537 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg)); 3538 tunnel_cfg.sk_user_data = vs; 3539 tunnel_cfg.encap_type = 1; 3540 tunnel_cfg.encap_rcv = vxlan_rcv; 3541 tunnel_cfg.encap_err_lookup = vxlan_err_lookup; 3542 tunnel_cfg.encap_destroy = NULL; 3543 if (vs->flags & VXLAN_F_GPE) { 3544 tunnel_cfg.gro_receive = vxlan_gpe_gro_receive; 3545 tunnel_cfg.gro_complete = vxlan_gpe_gro_complete; 3546 } else { 3547 tunnel_cfg.gro_receive = vxlan_gro_receive; 3548 tunnel_cfg.gro_complete = vxlan_gro_complete; 3549 } 3550 3551 setup_udp_tunnel_sock(net, sock, &tunnel_cfg); 3552 3553 return vs; 3554 } 3555 3556 static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6) 3557 { 3558 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id); 3559 bool metadata = vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA; 3560 struct vxlan_sock *vs = NULL; 3561 struct vxlan_dev_node *node; 3562 int l3mdev_index = 0; 3563 3564 if (vxlan->cfg.remote_ifindex) 3565 l3mdev_index = l3mdev_master_upper_ifindex_by_index( 3566 vxlan->net, vxlan->cfg.remote_ifindex); 3567 3568 if (!vxlan->cfg.no_share) { 3569 spin_lock(&vn->sock_lock); 3570 vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET, 3571 vxlan->cfg.dst_port, vxlan->cfg.flags, 3572 l3mdev_index); 3573 if (vs && !refcount_inc_not_zero(&vs->refcnt)) { 3574 spin_unlock(&vn->sock_lock); 3575 return -EBUSY; 3576 } 3577 spin_unlock(&vn->sock_lock); 3578 } 3579 if (!vs) 3580 vs = vxlan_socket_create(vxlan->net, ipv6, 3581 vxlan->cfg.dst_port, vxlan->cfg.flags, 3582 l3mdev_index); 3583 if (IS_ERR(vs)) 3584 return PTR_ERR(vs); 3585 #if IS_ENABLED(CONFIG_IPV6) 3586 if (ipv6) { 3587 rcu_assign_pointer(vxlan->vn6_sock, vs); 3588 node = &vxlan->hlist6; 3589 } else 3590 #endif 3591 { 3592 rcu_assign_pointer(vxlan->vn4_sock, vs); 3593 node = &vxlan->hlist4; 3594 } 3595 3596 if (metadata && (vxlan->cfg.flags & VXLAN_F_VNIFILTER)) 3597 vxlan_vs_add_vnigrp(vxlan, vs, ipv6); 3598 else 3599 vxlan_vs_add_dev(vs, vxlan, node); 3600 3601 return 0; 3602 } 3603 3604 static int vxlan_sock_add(struct vxlan_dev *vxlan) 3605 { 3606 bool metadata = vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA; 3607 bool ipv6 = vxlan->cfg.flags & VXLAN_F_IPV6 || metadata; 3608 bool ipv4 = !ipv6 || metadata; 3609 int ret = 0; 3610 3611 RCU_INIT_POINTER(vxlan->vn4_sock, NULL); 3612 #if IS_ENABLED(CONFIG_IPV6) 3613 RCU_INIT_POINTER(vxlan->vn6_sock, NULL); 3614 if (ipv6) { 3615 ret = __vxlan_sock_add(vxlan, true); 3616 if (ret < 0 && ret != -EAFNOSUPPORT) 3617 ipv4 = false; 3618 } 3619 #endif 3620 if (ipv4) 3621 ret = __vxlan_sock_add(vxlan, false); 3622 if (ret < 0) 3623 vxlan_sock_release(vxlan); 3624 return ret; 3625 } 3626 3627 int vxlan_vni_in_use(struct net *src_net, struct vxlan_dev *vxlan, 3628 struct vxlan_config *conf, __be32 vni) 3629 { 3630 struct vxlan_net *vn = net_generic(src_net, vxlan_net_id); 3631 struct vxlan_dev *tmp; 3632 3633 list_for_each_entry(tmp, &vn->vxlan_list, next) { 3634 if (tmp == vxlan) 3635 continue; 3636 if (tmp->cfg.flags & VXLAN_F_VNIFILTER) { 3637 if (!vxlan_vnifilter_lookup(tmp, vni)) 3638 continue; 3639 } else if (tmp->cfg.vni != vni) { 3640 continue; 3641 } 3642 if (tmp->cfg.dst_port != conf->dst_port) 3643 continue; 3644 if ((tmp->cfg.flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)) != 3645 (conf->flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6))) 3646 continue; 3647 3648 if ((conf->flags & VXLAN_F_IPV6_LINKLOCAL) && 3649 tmp->cfg.remote_ifindex != conf->remote_ifindex) 3650 continue; 3651 3652 return -EEXIST; 3653 } 3654 3655 return 0; 3656 } 3657 3658 static int vxlan_config_validate(struct net *src_net, struct vxlan_config *conf, 3659 struct net_device **lower, 3660 struct vxlan_dev *old, 3661 struct netlink_ext_ack *extack) 3662 { 3663 bool use_ipv6 = false; 3664 3665 if (conf->flags & VXLAN_F_GPE) { 3666 /* For now, allow GPE only together with 3667 * COLLECT_METADATA. This can be relaxed later; in such 3668 * case, the other side of the PtP link will have to be 3669 * provided. 3670 */ 3671 if ((conf->flags & ~VXLAN_F_ALLOWED_GPE) || 3672 !(conf->flags & VXLAN_F_COLLECT_METADATA)) { 3673 NL_SET_ERR_MSG(extack, 3674 "VXLAN GPE does not support this combination of attributes"); 3675 return -EINVAL; 3676 } 3677 } 3678 3679 if (!conf->remote_ip.sa.sa_family && !conf->saddr.sa.sa_family) { 3680 /* Unless IPv6 is explicitly requested, assume IPv4 */ 3681 conf->remote_ip.sa.sa_family = AF_INET; 3682 conf->saddr.sa.sa_family = AF_INET; 3683 } else if (!conf->remote_ip.sa.sa_family) { 3684 conf->remote_ip.sa.sa_family = conf->saddr.sa.sa_family; 3685 } else if (!conf->saddr.sa.sa_family) { 3686 conf->saddr.sa.sa_family = conf->remote_ip.sa.sa_family; 3687 } 3688 3689 if (conf->saddr.sa.sa_family != conf->remote_ip.sa.sa_family) { 3690 NL_SET_ERR_MSG(extack, 3691 "Local and remote address must be from the same family"); 3692 return -EINVAL; 3693 } 3694 3695 if (vxlan_addr_multicast(&conf->saddr)) { 3696 NL_SET_ERR_MSG(extack, "Local address cannot be multicast"); 3697 return -EINVAL; 3698 } 3699 3700 if (conf->saddr.sa.sa_family == AF_INET6) { 3701 if (!IS_ENABLED(CONFIG_IPV6)) { 3702 NL_SET_ERR_MSG(extack, 3703 "IPv6 support not enabled in the kernel"); 3704 return -EPFNOSUPPORT; 3705 } 3706 use_ipv6 = true; 3707 conf->flags |= VXLAN_F_IPV6; 3708 3709 if (!(conf->flags & VXLAN_F_COLLECT_METADATA)) { 3710 int local_type = 3711 ipv6_addr_type(&conf->saddr.sin6.sin6_addr); 3712 int remote_type = 3713 ipv6_addr_type(&conf->remote_ip.sin6.sin6_addr); 3714 3715 if (local_type & IPV6_ADDR_LINKLOCAL) { 3716 if (!(remote_type & IPV6_ADDR_LINKLOCAL) && 3717 (remote_type != IPV6_ADDR_ANY)) { 3718 NL_SET_ERR_MSG(extack, 3719 "Invalid combination of local and remote address scopes"); 3720 return -EINVAL; 3721 } 3722 3723 conf->flags |= VXLAN_F_IPV6_LINKLOCAL; 3724 } else { 3725 if (remote_type == 3726 (IPV6_ADDR_UNICAST | IPV6_ADDR_LINKLOCAL)) { 3727 NL_SET_ERR_MSG(extack, 3728 "Invalid combination of local and remote address scopes"); 3729 return -EINVAL; 3730 } 3731 3732 conf->flags &= ~VXLAN_F_IPV6_LINKLOCAL; 3733 } 3734 } 3735 } 3736 3737 if (conf->label && !use_ipv6) { 3738 NL_SET_ERR_MSG(extack, 3739 "Label attribute only applies to IPv6 VXLAN devices"); 3740 return -EINVAL; 3741 } 3742 3743 if (conf->remote_ifindex) { 3744 struct net_device *lowerdev; 3745 3746 lowerdev = __dev_get_by_index(src_net, conf->remote_ifindex); 3747 if (!lowerdev) { 3748 NL_SET_ERR_MSG(extack, 3749 "Invalid local interface, device not found"); 3750 return -ENODEV; 3751 } 3752 3753 #if IS_ENABLED(CONFIG_IPV6) 3754 if (use_ipv6) { 3755 struct inet6_dev *idev = __in6_dev_get(lowerdev); 3756 3757 if (idev && idev->cnf.disable_ipv6) { 3758 NL_SET_ERR_MSG(extack, 3759 "IPv6 support disabled by administrator"); 3760 return -EPERM; 3761 } 3762 } 3763 #endif 3764 3765 *lower = lowerdev; 3766 } else { 3767 if (vxlan_addr_multicast(&conf->remote_ip)) { 3768 NL_SET_ERR_MSG(extack, 3769 "Local interface required for multicast remote destination"); 3770 3771 return -EINVAL; 3772 } 3773 3774 #if IS_ENABLED(CONFIG_IPV6) 3775 if (conf->flags & VXLAN_F_IPV6_LINKLOCAL) { 3776 NL_SET_ERR_MSG(extack, 3777 "Local interface required for link-local local/remote addresses"); 3778 return -EINVAL; 3779 } 3780 #endif 3781 3782 *lower = NULL; 3783 } 3784 3785 if (!conf->dst_port) { 3786 if (conf->flags & VXLAN_F_GPE) 3787 conf->dst_port = htons(IANA_VXLAN_GPE_UDP_PORT); 3788 else 3789 conf->dst_port = htons(vxlan_port); 3790 } 3791 3792 if (!conf->age_interval) 3793 conf->age_interval = FDB_AGE_DEFAULT; 3794 3795 if (vxlan_vni_in_use(src_net, old, conf, conf->vni)) { 3796 NL_SET_ERR_MSG(extack, 3797 "A VXLAN device with the specified VNI already exists"); 3798 return -EEXIST; 3799 } 3800 3801 return 0; 3802 } 3803 3804 static void vxlan_config_apply(struct net_device *dev, 3805 struct vxlan_config *conf, 3806 struct net_device *lowerdev, 3807 struct net *src_net, 3808 bool changelink) 3809 { 3810 struct vxlan_dev *vxlan = netdev_priv(dev); 3811 struct vxlan_rdst *dst = &vxlan->default_dst; 3812 unsigned short needed_headroom = ETH_HLEN; 3813 int max_mtu = ETH_MAX_MTU; 3814 u32 flags = conf->flags; 3815 3816 if (!changelink) { 3817 if (flags & VXLAN_F_GPE) 3818 vxlan_raw_setup(dev); 3819 else 3820 vxlan_ether_setup(dev); 3821 3822 if (conf->mtu) 3823 dev->mtu = conf->mtu; 3824 3825 vxlan->net = src_net; 3826 } 3827 3828 dst->remote_vni = conf->vni; 3829 3830 memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip)); 3831 3832 if (lowerdev) { 3833 dst->remote_ifindex = conf->remote_ifindex; 3834 3835 netif_inherit_tso_max(dev, lowerdev); 3836 3837 needed_headroom = lowerdev->hard_header_len; 3838 needed_headroom += lowerdev->needed_headroom; 3839 3840 dev->needed_tailroom = lowerdev->needed_tailroom; 3841 3842 max_mtu = lowerdev->mtu - vxlan_headroom(flags); 3843 if (max_mtu < ETH_MIN_MTU) 3844 max_mtu = ETH_MIN_MTU; 3845 3846 if (!changelink && !conf->mtu) 3847 dev->mtu = max_mtu; 3848 } 3849 3850 if (dev->mtu > max_mtu) 3851 dev->mtu = max_mtu; 3852 3853 if (flags & VXLAN_F_COLLECT_METADATA) 3854 flags |= VXLAN_F_IPV6; 3855 needed_headroom += vxlan_headroom(flags); 3856 dev->needed_headroom = needed_headroom; 3857 3858 memcpy(&vxlan->cfg, conf, sizeof(*conf)); 3859 } 3860 3861 static int vxlan_dev_configure(struct net *src_net, struct net_device *dev, 3862 struct vxlan_config *conf, bool changelink, 3863 struct netlink_ext_ack *extack) 3864 { 3865 struct vxlan_dev *vxlan = netdev_priv(dev); 3866 struct net_device *lowerdev; 3867 int ret; 3868 3869 ret = vxlan_config_validate(src_net, conf, &lowerdev, vxlan, extack); 3870 if (ret) 3871 return ret; 3872 3873 vxlan_config_apply(dev, conf, lowerdev, src_net, changelink); 3874 3875 return 0; 3876 } 3877 3878 static int __vxlan_dev_create(struct net *net, struct net_device *dev, 3879 struct vxlan_config *conf, 3880 struct netlink_ext_ack *extack) 3881 { 3882 struct vxlan_net *vn = net_generic(net, vxlan_net_id); 3883 struct vxlan_dev *vxlan = netdev_priv(dev); 3884 struct net_device *remote_dev = NULL; 3885 struct vxlan_fdb *f = NULL; 3886 bool unregister = false; 3887 struct vxlan_rdst *dst; 3888 int err; 3889 3890 dst = &vxlan->default_dst; 3891 err = vxlan_dev_configure(net, dev, conf, false, extack); 3892 if (err) 3893 return err; 3894 3895 dev->ethtool_ops = &vxlan_ethtool_ops; 3896 3897 /* create an fdb entry for a valid default destination */ 3898 if (!vxlan_addr_any(&dst->remote_ip)) { 3899 err = vxlan_fdb_create(vxlan, all_zeros_mac, 3900 &dst->remote_ip, 3901 NUD_REACHABLE | NUD_PERMANENT, 3902 vxlan->cfg.dst_port, 3903 dst->remote_vni, 3904 dst->remote_vni, 3905 dst->remote_ifindex, 3906 NTF_SELF, 0, &f, extack); 3907 if (err) 3908 return err; 3909 } 3910 3911 err = register_netdevice(dev); 3912 if (err) 3913 goto errout; 3914 unregister = true; 3915 3916 if (dst->remote_ifindex) { 3917 remote_dev = __dev_get_by_index(net, dst->remote_ifindex); 3918 if (!remote_dev) { 3919 err = -ENODEV; 3920 goto errout; 3921 } 3922 3923 err = netdev_upper_dev_link(remote_dev, dev, extack); 3924 if (err) 3925 goto errout; 3926 } 3927 3928 err = rtnl_configure_link(dev, NULL, 0, NULL); 3929 if (err < 0) 3930 goto unlink; 3931 3932 if (f) { 3933 vxlan_fdb_insert(vxlan, all_zeros_mac, dst->remote_vni, f); 3934 3935 /* notify default fdb entry */ 3936 err = vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), 3937 RTM_NEWNEIGH, true, extack); 3938 if (err) { 3939 vxlan_fdb_destroy(vxlan, f, false, false); 3940 if (remote_dev) 3941 netdev_upper_dev_unlink(remote_dev, dev); 3942 goto unregister; 3943 } 3944 } 3945 3946 list_add(&vxlan->next, &vn->vxlan_list); 3947 if (remote_dev) 3948 dst->remote_dev = remote_dev; 3949 return 0; 3950 unlink: 3951 if (remote_dev) 3952 netdev_upper_dev_unlink(remote_dev, dev); 3953 errout: 3954 /* unregister_netdevice() destroys the default FDB entry with deletion 3955 * notification. But the addition notification was not sent yet, so 3956 * destroy the entry by hand here. 3957 */ 3958 if (f) 3959 __vxlan_fdb_free(f); 3960 unregister: 3961 if (unregister) 3962 unregister_netdevice(dev); 3963 return err; 3964 } 3965 3966 /* Set/clear flags based on attribute */ 3967 static int vxlan_nl2flag(struct vxlan_config *conf, struct nlattr *tb[], 3968 int attrtype, unsigned long mask, bool changelink, 3969 bool changelink_supported, 3970 struct netlink_ext_ack *extack) 3971 { 3972 unsigned long flags; 3973 3974 if (!tb[attrtype]) 3975 return 0; 3976 3977 if (changelink && !changelink_supported) { 3978 vxlan_flag_attr_error(attrtype, extack); 3979 return -EOPNOTSUPP; 3980 } 3981 3982 if (vxlan_policy[attrtype].type == NLA_FLAG) 3983 flags = conf->flags | mask; 3984 else if (nla_get_u8(tb[attrtype])) 3985 flags = conf->flags | mask; 3986 else 3987 flags = conf->flags & ~mask; 3988 3989 conf->flags = flags; 3990 3991 return 0; 3992 } 3993 3994 static int vxlan_nl2conf(struct nlattr *tb[], struct nlattr *data[], 3995 struct net_device *dev, struct vxlan_config *conf, 3996 bool changelink, struct netlink_ext_ack *extack) 3997 { 3998 struct vxlan_dev *vxlan = netdev_priv(dev); 3999 int err = 0; 4000 4001 memset(conf, 0, sizeof(*conf)); 4002 4003 /* if changelink operation, start with old existing cfg */ 4004 if (changelink) 4005 memcpy(conf, &vxlan->cfg, sizeof(*conf)); 4006 4007 if (data[IFLA_VXLAN_ID]) { 4008 __be32 vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID])); 4009 4010 if (changelink && (vni != conf->vni)) { 4011 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_ID], "Cannot change VNI"); 4012 return -EOPNOTSUPP; 4013 } 4014 conf->vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID])); 4015 } 4016 4017 if (data[IFLA_VXLAN_GROUP]) { 4018 if (changelink && (conf->remote_ip.sa.sa_family != AF_INET)) { 4019 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP], "New group address family does not match old group"); 4020 return -EOPNOTSUPP; 4021 } 4022 4023 conf->remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]); 4024 conf->remote_ip.sa.sa_family = AF_INET; 4025 } else if (data[IFLA_VXLAN_GROUP6]) { 4026 if (!IS_ENABLED(CONFIG_IPV6)) { 4027 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP6], "IPv6 support not enabled in the kernel"); 4028 return -EPFNOSUPPORT; 4029 } 4030 4031 if (changelink && (conf->remote_ip.sa.sa_family != AF_INET6)) { 4032 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP6], "New group address family does not match old group"); 4033 return -EOPNOTSUPP; 4034 } 4035 4036 conf->remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]); 4037 conf->remote_ip.sa.sa_family = AF_INET6; 4038 } 4039 4040 if (data[IFLA_VXLAN_LOCAL]) { 4041 if (changelink && (conf->saddr.sa.sa_family != AF_INET)) { 4042 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL], "New local address family does not match old"); 4043 return -EOPNOTSUPP; 4044 } 4045 4046 conf->saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]); 4047 conf->saddr.sa.sa_family = AF_INET; 4048 } else if (data[IFLA_VXLAN_LOCAL6]) { 4049 if (!IS_ENABLED(CONFIG_IPV6)) { 4050 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL6], "IPv6 support not enabled in the kernel"); 4051 return -EPFNOSUPPORT; 4052 } 4053 4054 if (changelink && (conf->saddr.sa.sa_family != AF_INET6)) { 4055 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL6], "New local address family does not match old"); 4056 return -EOPNOTSUPP; 4057 } 4058 4059 /* TODO: respect scope id */ 4060 conf->saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]); 4061 conf->saddr.sa.sa_family = AF_INET6; 4062 } 4063 4064 if (data[IFLA_VXLAN_LINK]) 4065 conf->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]); 4066 4067 if (data[IFLA_VXLAN_TOS]) 4068 conf->tos = nla_get_u8(data[IFLA_VXLAN_TOS]); 4069 4070 if (data[IFLA_VXLAN_TTL]) 4071 conf->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]); 4072 4073 if (data[IFLA_VXLAN_TTL_INHERIT]) { 4074 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_TTL_INHERIT, 4075 VXLAN_F_TTL_INHERIT, changelink, false, 4076 extack); 4077 if (err) 4078 return err; 4079 4080 } 4081 4082 if (data[IFLA_VXLAN_LABEL]) 4083 conf->label = nla_get_be32(data[IFLA_VXLAN_LABEL]) & 4084 IPV6_FLOWLABEL_MASK; 4085 4086 if (data[IFLA_VXLAN_LEARNING]) { 4087 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_LEARNING, 4088 VXLAN_F_LEARN, changelink, true, 4089 extack); 4090 if (err) 4091 return err; 4092 } else if (!changelink) { 4093 /* default to learn on a new device */ 4094 conf->flags |= VXLAN_F_LEARN; 4095 } 4096 4097 if (data[IFLA_VXLAN_AGEING]) 4098 conf->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]); 4099 4100 if (data[IFLA_VXLAN_PROXY]) { 4101 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_PROXY, 4102 VXLAN_F_PROXY, changelink, false, 4103 extack); 4104 if (err) 4105 return err; 4106 } 4107 4108 if (data[IFLA_VXLAN_RSC]) { 4109 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_RSC, 4110 VXLAN_F_RSC, changelink, false, 4111 extack); 4112 if (err) 4113 return err; 4114 } 4115 4116 if (data[IFLA_VXLAN_L2MISS]) { 4117 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_L2MISS, 4118 VXLAN_F_L2MISS, changelink, false, 4119 extack); 4120 if (err) 4121 return err; 4122 } 4123 4124 if (data[IFLA_VXLAN_L3MISS]) { 4125 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_L3MISS, 4126 VXLAN_F_L3MISS, changelink, false, 4127 extack); 4128 if (err) 4129 return err; 4130 } 4131 4132 if (data[IFLA_VXLAN_LIMIT]) { 4133 if (changelink) { 4134 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LIMIT], 4135 "Cannot change limit"); 4136 return -EOPNOTSUPP; 4137 } 4138 conf->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]); 4139 } 4140 4141 if (data[IFLA_VXLAN_COLLECT_METADATA]) { 4142 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_COLLECT_METADATA, 4143 VXLAN_F_COLLECT_METADATA, changelink, false, 4144 extack); 4145 if (err) 4146 return err; 4147 } 4148 4149 if (data[IFLA_VXLAN_PORT_RANGE]) { 4150 if (!changelink) { 4151 const struct ifla_vxlan_port_range *p 4152 = nla_data(data[IFLA_VXLAN_PORT_RANGE]); 4153 conf->port_min = ntohs(p->low); 4154 conf->port_max = ntohs(p->high); 4155 } else { 4156 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT_RANGE], 4157 "Cannot change port range"); 4158 return -EOPNOTSUPP; 4159 } 4160 } 4161 4162 if (data[IFLA_VXLAN_PORT]) { 4163 if (changelink) { 4164 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT], 4165 "Cannot change port"); 4166 return -EOPNOTSUPP; 4167 } 4168 conf->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]); 4169 } 4170 4171 if (data[IFLA_VXLAN_UDP_CSUM]) { 4172 if (changelink) { 4173 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_UDP_CSUM], 4174 "Cannot change UDP_CSUM flag"); 4175 return -EOPNOTSUPP; 4176 } 4177 if (!nla_get_u8(data[IFLA_VXLAN_UDP_CSUM])) 4178 conf->flags |= VXLAN_F_UDP_ZERO_CSUM_TX; 4179 } 4180 4181 if (data[IFLA_VXLAN_LOCALBYPASS]) { 4182 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_LOCALBYPASS, 4183 VXLAN_F_LOCALBYPASS, changelink, 4184 true, extack); 4185 if (err) 4186 return err; 4187 } else if (!changelink) { 4188 /* default to local bypass on a new device */ 4189 conf->flags |= VXLAN_F_LOCALBYPASS; 4190 } 4191 4192 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]) { 4193 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_UDP_ZERO_CSUM6_TX, 4194 VXLAN_F_UDP_ZERO_CSUM6_TX, changelink, 4195 false, extack); 4196 if (err) 4197 return err; 4198 } 4199 4200 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]) { 4201 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_UDP_ZERO_CSUM6_RX, 4202 VXLAN_F_UDP_ZERO_CSUM6_RX, changelink, 4203 false, extack); 4204 if (err) 4205 return err; 4206 } 4207 4208 if (data[IFLA_VXLAN_REMCSUM_TX]) { 4209 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_TX, 4210 VXLAN_F_REMCSUM_TX, changelink, false, 4211 extack); 4212 if (err) 4213 return err; 4214 } 4215 4216 if (data[IFLA_VXLAN_REMCSUM_RX]) { 4217 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_RX, 4218 VXLAN_F_REMCSUM_RX, changelink, false, 4219 extack); 4220 if (err) 4221 return err; 4222 } 4223 4224 if (data[IFLA_VXLAN_GBP]) { 4225 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_GBP, 4226 VXLAN_F_GBP, changelink, false, extack); 4227 if (err) 4228 return err; 4229 } 4230 4231 if (data[IFLA_VXLAN_GPE]) { 4232 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_GPE, 4233 VXLAN_F_GPE, changelink, false, 4234 extack); 4235 if (err) 4236 return err; 4237 } 4238 4239 if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL]) { 4240 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_NOPARTIAL, 4241 VXLAN_F_REMCSUM_NOPARTIAL, changelink, 4242 false, extack); 4243 if (err) 4244 return err; 4245 } 4246 4247 if (tb[IFLA_MTU]) { 4248 if (changelink) { 4249 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_MTU], 4250 "Cannot change mtu"); 4251 return -EOPNOTSUPP; 4252 } 4253 conf->mtu = nla_get_u32(tb[IFLA_MTU]); 4254 } 4255 4256 if (data[IFLA_VXLAN_DF]) 4257 conf->df = nla_get_u8(data[IFLA_VXLAN_DF]); 4258 4259 if (data[IFLA_VXLAN_VNIFILTER]) { 4260 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_VNIFILTER, 4261 VXLAN_F_VNIFILTER, changelink, false, 4262 extack); 4263 if (err) 4264 return err; 4265 4266 if ((conf->flags & VXLAN_F_VNIFILTER) && 4267 !(conf->flags & VXLAN_F_COLLECT_METADATA)) { 4268 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_VNIFILTER], 4269 "vxlan vnifilter only valid in collect metadata mode"); 4270 return -EINVAL; 4271 } 4272 } 4273 4274 return 0; 4275 } 4276 4277 static int vxlan_newlink(struct net *src_net, struct net_device *dev, 4278 struct nlattr *tb[], struct nlattr *data[], 4279 struct netlink_ext_ack *extack) 4280 { 4281 struct vxlan_config conf; 4282 int err; 4283 4284 err = vxlan_nl2conf(tb, data, dev, &conf, false, extack); 4285 if (err) 4286 return err; 4287 4288 return __vxlan_dev_create(src_net, dev, &conf, extack); 4289 } 4290 4291 static int vxlan_changelink(struct net_device *dev, struct nlattr *tb[], 4292 struct nlattr *data[], 4293 struct netlink_ext_ack *extack) 4294 { 4295 struct vxlan_dev *vxlan = netdev_priv(dev); 4296 struct net_device *lowerdev; 4297 struct vxlan_config conf; 4298 struct vxlan_rdst *dst; 4299 int err; 4300 4301 dst = &vxlan->default_dst; 4302 err = vxlan_nl2conf(tb, data, dev, &conf, true, extack); 4303 if (err) 4304 return err; 4305 4306 err = vxlan_config_validate(vxlan->net, &conf, &lowerdev, 4307 vxlan, extack); 4308 if (err) 4309 return err; 4310 4311 if (dst->remote_dev == lowerdev) 4312 lowerdev = NULL; 4313 4314 err = netdev_adjacent_change_prepare(dst->remote_dev, lowerdev, dev, 4315 extack); 4316 if (err) 4317 return err; 4318 4319 /* handle default dst entry */ 4320 if (!vxlan_addr_equal(&conf.remote_ip, &dst->remote_ip)) { 4321 u32 hash_index = fdb_head_index(vxlan, all_zeros_mac, conf.vni); 4322 4323 spin_lock_bh(&vxlan->hash_lock[hash_index]); 4324 if (!vxlan_addr_any(&conf.remote_ip)) { 4325 err = vxlan_fdb_update(vxlan, all_zeros_mac, 4326 &conf.remote_ip, 4327 NUD_REACHABLE | NUD_PERMANENT, 4328 NLM_F_APPEND | NLM_F_CREATE, 4329 vxlan->cfg.dst_port, 4330 conf.vni, conf.vni, 4331 conf.remote_ifindex, 4332 NTF_SELF, 0, true, extack); 4333 if (err) { 4334 spin_unlock_bh(&vxlan->hash_lock[hash_index]); 4335 netdev_adjacent_change_abort(dst->remote_dev, 4336 lowerdev, dev); 4337 return err; 4338 } 4339 } 4340 if (!vxlan_addr_any(&dst->remote_ip)) 4341 __vxlan_fdb_delete(vxlan, all_zeros_mac, 4342 dst->remote_ip, 4343 vxlan->cfg.dst_port, 4344 dst->remote_vni, 4345 dst->remote_vni, 4346 dst->remote_ifindex, 4347 true); 4348 spin_unlock_bh(&vxlan->hash_lock[hash_index]); 4349 4350 /* If vni filtering device, also update fdb entries of 4351 * all vnis that were using default remote ip 4352 */ 4353 if (vxlan->cfg.flags & VXLAN_F_VNIFILTER) { 4354 err = vxlan_vnilist_update_group(vxlan, &dst->remote_ip, 4355 &conf.remote_ip, extack); 4356 if (err) { 4357 netdev_adjacent_change_abort(dst->remote_dev, 4358 lowerdev, dev); 4359 return err; 4360 } 4361 } 4362 } 4363 4364 if (conf.age_interval != vxlan->cfg.age_interval) 4365 mod_timer(&vxlan->age_timer, jiffies); 4366 4367 netdev_adjacent_change_commit(dst->remote_dev, lowerdev, dev); 4368 if (lowerdev && lowerdev != dst->remote_dev) 4369 dst->remote_dev = lowerdev; 4370 vxlan_config_apply(dev, &conf, lowerdev, vxlan->net, true); 4371 return 0; 4372 } 4373 4374 static void vxlan_dellink(struct net_device *dev, struct list_head *head) 4375 { 4376 struct vxlan_dev *vxlan = netdev_priv(dev); 4377 struct vxlan_fdb_flush_desc desc = { 4378 /* Default entry is deleted at vxlan_uninit. */ 4379 .ignore_default_entry = true, 4380 }; 4381 4382 vxlan_flush(vxlan, &desc); 4383 4384 list_del(&vxlan->next); 4385 unregister_netdevice_queue(dev, head); 4386 if (vxlan->default_dst.remote_dev) 4387 netdev_upper_dev_unlink(vxlan->default_dst.remote_dev, dev); 4388 } 4389 4390 static size_t vxlan_get_size(const struct net_device *dev) 4391 { 4392 return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */ 4393 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */ 4394 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */ 4395 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */ 4396 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */ 4397 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL_INHERIT */ 4398 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */ 4399 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_DF */ 4400 nla_total_size(sizeof(__be32)) + /* IFLA_VXLAN_LABEL */ 4401 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */ 4402 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */ 4403 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */ 4404 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */ 4405 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */ 4406 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_COLLECT_METADATA */ 4407 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */ 4408 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */ 4409 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */ 4410 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */ 4411 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */ 4412 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */ 4413 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */ 4414 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */ 4415 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LOCALBYPASS */ 4416 /* IFLA_VXLAN_PORT_RANGE */ 4417 nla_total_size(sizeof(struct ifla_vxlan_port_range)) + 4418 nla_total_size(0) + /* IFLA_VXLAN_GBP */ 4419 nla_total_size(0) + /* IFLA_VXLAN_GPE */ 4420 nla_total_size(0) + /* IFLA_VXLAN_REMCSUM_NOPARTIAL */ 4421 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_VNIFILTER */ 4422 0; 4423 } 4424 4425 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev) 4426 { 4427 const struct vxlan_dev *vxlan = netdev_priv(dev); 4428 const struct vxlan_rdst *dst = &vxlan->default_dst; 4429 struct ifla_vxlan_port_range ports = { 4430 .low = htons(vxlan->cfg.port_min), 4431 .high = htons(vxlan->cfg.port_max), 4432 }; 4433 4434 if (nla_put_u32(skb, IFLA_VXLAN_ID, be32_to_cpu(dst->remote_vni))) 4435 goto nla_put_failure; 4436 4437 if (!vxlan_addr_any(&dst->remote_ip)) { 4438 if (dst->remote_ip.sa.sa_family == AF_INET) { 4439 if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP, 4440 dst->remote_ip.sin.sin_addr.s_addr)) 4441 goto nla_put_failure; 4442 #if IS_ENABLED(CONFIG_IPV6) 4443 } else { 4444 if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6, 4445 &dst->remote_ip.sin6.sin6_addr)) 4446 goto nla_put_failure; 4447 #endif 4448 } 4449 } 4450 4451 if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex)) 4452 goto nla_put_failure; 4453 4454 if (!vxlan_addr_any(&vxlan->cfg.saddr)) { 4455 if (vxlan->cfg.saddr.sa.sa_family == AF_INET) { 4456 if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL, 4457 vxlan->cfg.saddr.sin.sin_addr.s_addr)) 4458 goto nla_put_failure; 4459 #if IS_ENABLED(CONFIG_IPV6) 4460 } else { 4461 if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6, 4462 &vxlan->cfg.saddr.sin6.sin6_addr)) 4463 goto nla_put_failure; 4464 #endif 4465 } 4466 } 4467 4468 if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) || 4469 nla_put_u8(skb, IFLA_VXLAN_TTL_INHERIT, 4470 !!(vxlan->cfg.flags & VXLAN_F_TTL_INHERIT)) || 4471 nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) || 4472 nla_put_u8(skb, IFLA_VXLAN_DF, vxlan->cfg.df) || 4473 nla_put_be32(skb, IFLA_VXLAN_LABEL, vxlan->cfg.label) || 4474 nla_put_u8(skb, IFLA_VXLAN_LEARNING, 4475 !!(vxlan->cfg.flags & VXLAN_F_LEARN)) || 4476 nla_put_u8(skb, IFLA_VXLAN_PROXY, 4477 !!(vxlan->cfg.flags & VXLAN_F_PROXY)) || 4478 nla_put_u8(skb, IFLA_VXLAN_RSC, 4479 !!(vxlan->cfg.flags & VXLAN_F_RSC)) || 4480 nla_put_u8(skb, IFLA_VXLAN_L2MISS, 4481 !!(vxlan->cfg.flags & VXLAN_F_L2MISS)) || 4482 nla_put_u8(skb, IFLA_VXLAN_L3MISS, 4483 !!(vxlan->cfg.flags & VXLAN_F_L3MISS)) || 4484 nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA, 4485 !!(vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)) || 4486 nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) || 4487 nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) || 4488 nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) || 4489 nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM, 4490 !(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM_TX)) || 4491 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX, 4492 !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) || 4493 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX, 4494 !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) || 4495 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX, 4496 !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_TX)) || 4497 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX, 4498 !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_RX)) || 4499 nla_put_u8(skb, IFLA_VXLAN_LOCALBYPASS, 4500 !!(vxlan->cfg.flags & VXLAN_F_LOCALBYPASS))) 4501 goto nla_put_failure; 4502 4503 if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports)) 4504 goto nla_put_failure; 4505 4506 if (vxlan->cfg.flags & VXLAN_F_GBP && 4507 nla_put_flag(skb, IFLA_VXLAN_GBP)) 4508 goto nla_put_failure; 4509 4510 if (vxlan->cfg.flags & VXLAN_F_GPE && 4511 nla_put_flag(skb, IFLA_VXLAN_GPE)) 4512 goto nla_put_failure; 4513 4514 if (vxlan->cfg.flags & VXLAN_F_REMCSUM_NOPARTIAL && 4515 nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL)) 4516 goto nla_put_failure; 4517 4518 if (vxlan->cfg.flags & VXLAN_F_VNIFILTER && 4519 nla_put_u8(skb, IFLA_VXLAN_VNIFILTER, 4520 !!(vxlan->cfg.flags & VXLAN_F_VNIFILTER))) 4521 goto nla_put_failure; 4522 4523 return 0; 4524 4525 nla_put_failure: 4526 return -EMSGSIZE; 4527 } 4528 4529 static struct net *vxlan_get_link_net(const struct net_device *dev) 4530 { 4531 struct vxlan_dev *vxlan = netdev_priv(dev); 4532 4533 return vxlan->net; 4534 } 4535 4536 static struct rtnl_link_ops vxlan_link_ops __read_mostly = { 4537 .kind = "vxlan", 4538 .maxtype = IFLA_VXLAN_MAX, 4539 .policy = vxlan_policy, 4540 .priv_size = sizeof(struct vxlan_dev), 4541 .setup = vxlan_setup, 4542 .validate = vxlan_validate, 4543 .newlink = vxlan_newlink, 4544 .changelink = vxlan_changelink, 4545 .dellink = vxlan_dellink, 4546 .get_size = vxlan_get_size, 4547 .fill_info = vxlan_fill_info, 4548 .get_link_net = vxlan_get_link_net, 4549 }; 4550 4551 struct net_device *vxlan_dev_create(struct net *net, const char *name, 4552 u8 name_assign_type, 4553 struct vxlan_config *conf) 4554 { 4555 struct nlattr *tb[IFLA_MAX + 1]; 4556 struct net_device *dev; 4557 int err; 4558 4559 memset(&tb, 0, sizeof(tb)); 4560 4561 dev = rtnl_create_link(net, name, name_assign_type, 4562 &vxlan_link_ops, tb, NULL); 4563 if (IS_ERR(dev)) 4564 return dev; 4565 4566 err = __vxlan_dev_create(net, dev, conf, NULL); 4567 if (err < 0) { 4568 free_netdev(dev); 4569 return ERR_PTR(err); 4570 } 4571 4572 err = rtnl_configure_link(dev, NULL, 0, NULL); 4573 if (err < 0) { 4574 LIST_HEAD(list_kill); 4575 4576 vxlan_dellink(dev, &list_kill); 4577 unregister_netdevice_many(&list_kill); 4578 return ERR_PTR(err); 4579 } 4580 4581 return dev; 4582 } 4583 EXPORT_SYMBOL_GPL(vxlan_dev_create); 4584 4585 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn, 4586 struct net_device *dev) 4587 { 4588 struct vxlan_dev *vxlan, *next; 4589 LIST_HEAD(list_kill); 4590 4591 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) { 4592 struct vxlan_rdst *dst = &vxlan->default_dst; 4593 4594 /* In case we created vxlan device with carrier 4595 * and we loose the carrier due to module unload 4596 * we also need to remove vxlan device. In other 4597 * cases, it's not necessary and remote_ifindex 4598 * is 0 here, so no matches. 4599 */ 4600 if (dst->remote_ifindex == dev->ifindex) 4601 vxlan_dellink(vxlan->dev, &list_kill); 4602 } 4603 4604 unregister_netdevice_many(&list_kill); 4605 } 4606 4607 static int vxlan_netdevice_event(struct notifier_block *unused, 4608 unsigned long event, void *ptr) 4609 { 4610 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 4611 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id); 4612 4613 if (event == NETDEV_UNREGISTER) 4614 vxlan_handle_lowerdev_unregister(vn, dev); 4615 else if (event == NETDEV_UDP_TUNNEL_PUSH_INFO) 4616 vxlan_offload_rx_ports(dev, true); 4617 else if (event == NETDEV_UDP_TUNNEL_DROP_INFO) 4618 vxlan_offload_rx_ports(dev, false); 4619 4620 return NOTIFY_DONE; 4621 } 4622 4623 static struct notifier_block vxlan_notifier_block __read_mostly = { 4624 .notifier_call = vxlan_netdevice_event, 4625 }; 4626 4627 static void 4628 vxlan_fdb_offloaded_set(struct net_device *dev, 4629 struct switchdev_notifier_vxlan_fdb_info *fdb_info) 4630 { 4631 struct vxlan_dev *vxlan = netdev_priv(dev); 4632 struct vxlan_rdst *rdst; 4633 struct vxlan_fdb *f; 4634 u32 hash_index; 4635 4636 hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni); 4637 4638 spin_lock_bh(&vxlan->hash_lock[hash_index]); 4639 4640 f = vxlan_find_mac(vxlan, fdb_info->eth_addr, fdb_info->vni); 4641 if (!f) 4642 goto out; 4643 4644 rdst = vxlan_fdb_find_rdst(f, &fdb_info->remote_ip, 4645 fdb_info->remote_port, 4646 fdb_info->remote_vni, 4647 fdb_info->remote_ifindex); 4648 if (!rdst) 4649 goto out; 4650 4651 rdst->offloaded = fdb_info->offloaded; 4652 4653 out: 4654 spin_unlock_bh(&vxlan->hash_lock[hash_index]); 4655 } 4656 4657 static int 4658 vxlan_fdb_external_learn_add(struct net_device *dev, 4659 struct switchdev_notifier_vxlan_fdb_info *fdb_info) 4660 { 4661 struct vxlan_dev *vxlan = netdev_priv(dev); 4662 struct netlink_ext_ack *extack; 4663 u32 hash_index; 4664 int err; 4665 4666 hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni); 4667 extack = switchdev_notifier_info_to_extack(&fdb_info->info); 4668 4669 spin_lock_bh(&vxlan->hash_lock[hash_index]); 4670 err = vxlan_fdb_update(vxlan, fdb_info->eth_addr, &fdb_info->remote_ip, 4671 NUD_REACHABLE, 4672 NLM_F_CREATE | NLM_F_REPLACE, 4673 fdb_info->remote_port, 4674 fdb_info->vni, 4675 fdb_info->remote_vni, 4676 fdb_info->remote_ifindex, 4677 NTF_USE | NTF_SELF | NTF_EXT_LEARNED, 4678 0, false, extack); 4679 spin_unlock_bh(&vxlan->hash_lock[hash_index]); 4680 4681 return err; 4682 } 4683 4684 static int 4685 vxlan_fdb_external_learn_del(struct net_device *dev, 4686 struct switchdev_notifier_vxlan_fdb_info *fdb_info) 4687 { 4688 struct vxlan_dev *vxlan = netdev_priv(dev); 4689 struct vxlan_fdb *f; 4690 u32 hash_index; 4691 int err = 0; 4692 4693 hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni); 4694 spin_lock_bh(&vxlan->hash_lock[hash_index]); 4695 4696 f = vxlan_find_mac(vxlan, fdb_info->eth_addr, fdb_info->vni); 4697 if (!f) 4698 err = -ENOENT; 4699 else if (f->flags & NTF_EXT_LEARNED) 4700 err = __vxlan_fdb_delete(vxlan, fdb_info->eth_addr, 4701 fdb_info->remote_ip, 4702 fdb_info->remote_port, 4703 fdb_info->vni, 4704 fdb_info->remote_vni, 4705 fdb_info->remote_ifindex, 4706 false); 4707 4708 spin_unlock_bh(&vxlan->hash_lock[hash_index]); 4709 4710 return err; 4711 } 4712 4713 static int vxlan_switchdev_event(struct notifier_block *unused, 4714 unsigned long event, void *ptr) 4715 { 4716 struct net_device *dev = switchdev_notifier_info_to_dev(ptr); 4717 struct switchdev_notifier_vxlan_fdb_info *fdb_info; 4718 int err = 0; 4719 4720 switch (event) { 4721 case SWITCHDEV_VXLAN_FDB_OFFLOADED: 4722 vxlan_fdb_offloaded_set(dev, ptr); 4723 break; 4724 case SWITCHDEV_VXLAN_FDB_ADD_TO_BRIDGE: 4725 fdb_info = ptr; 4726 err = vxlan_fdb_external_learn_add(dev, fdb_info); 4727 if (err) { 4728 err = notifier_from_errno(err); 4729 break; 4730 } 4731 fdb_info->offloaded = true; 4732 vxlan_fdb_offloaded_set(dev, fdb_info); 4733 break; 4734 case SWITCHDEV_VXLAN_FDB_DEL_TO_BRIDGE: 4735 fdb_info = ptr; 4736 err = vxlan_fdb_external_learn_del(dev, fdb_info); 4737 if (err) { 4738 err = notifier_from_errno(err); 4739 break; 4740 } 4741 fdb_info->offloaded = false; 4742 vxlan_fdb_offloaded_set(dev, fdb_info); 4743 break; 4744 } 4745 4746 return err; 4747 } 4748 4749 static struct notifier_block vxlan_switchdev_notifier_block __read_mostly = { 4750 .notifier_call = vxlan_switchdev_event, 4751 }; 4752 4753 static void vxlan_fdb_nh_flush(struct nexthop *nh) 4754 { 4755 struct vxlan_fdb *fdb; 4756 struct vxlan_dev *vxlan; 4757 u32 hash_index; 4758 4759 rcu_read_lock(); 4760 list_for_each_entry_rcu(fdb, &nh->fdb_list, nh_list) { 4761 vxlan = rcu_dereference(fdb->vdev); 4762 WARN_ON(!vxlan); 4763 hash_index = fdb_head_index(vxlan, fdb->eth_addr, 4764 vxlan->default_dst.remote_vni); 4765 spin_lock_bh(&vxlan->hash_lock[hash_index]); 4766 if (!hlist_unhashed(&fdb->hlist)) 4767 vxlan_fdb_destroy(vxlan, fdb, false, false); 4768 spin_unlock_bh(&vxlan->hash_lock[hash_index]); 4769 } 4770 rcu_read_unlock(); 4771 } 4772 4773 static int vxlan_nexthop_event(struct notifier_block *nb, 4774 unsigned long event, void *ptr) 4775 { 4776 struct nh_notifier_info *info = ptr; 4777 struct nexthop *nh; 4778 4779 if (event != NEXTHOP_EVENT_DEL) 4780 return NOTIFY_DONE; 4781 4782 nh = nexthop_find_by_id(info->net, info->id); 4783 if (!nh) 4784 return NOTIFY_DONE; 4785 4786 vxlan_fdb_nh_flush(nh); 4787 4788 return NOTIFY_DONE; 4789 } 4790 4791 static __net_init int vxlan_init_net(struct net *net) 4792 { 4793 struct vxlan_net *vn = net_generic(net, vxlan_net_id); 4794 unsigned int h; 4795 4796 INIT_LIST_HEAD(&vn->vxlan_list); 4797 spin_lock_init(&vn->sock_lock); 4798 vn->nexthop_notifier_block.notifier_call = vxlan_nexthop_event; 4799 4800 for (h = 0; h < PORT_HASH_SIZE; ++h) 4801 INIT_HLIST_HEAD(&vn->sock_list[h]); 4802 4803 return register_nexthop_notifier(net, &vn->nexthop_notifier_block, 4804 NULL); 4805 } 4806 4807 static void vxlan_destroy_tunnels(struct net *net, struct list_head *head) 4808 { 4809 struct vxlan_net *vn = net_generic(net, vxlan_net_id); 4810 struct vxlan_dev *vxlan, *next; 4811 struct net_device *dev, *aux; 4812 4813 for_each_netdev_safe(net, dev, aux) 4814 if (dev->rtnl_link_ops == &vxlan_link_ops) 4815 unregister_netdevice_queue(dev, head); 4816 4817 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) { 4818 /* If vxlan->dev is in the same netns, it has already been added 4819 * to the list by the previous loop. 4820 */ 4821 if (!net_eq(dev_net(vxlan->dev), net)) 4822 unregister_netdevice_queue(vxlan->dev, head); 4823 } 4824 4825 } 4826 4827 static void __net_exit vxlan_exit_batch_net(struct list_head *net_list) 4828 { 4829 struct net *net; 4830 LIST_HEAD(list); 4831 unsigned int h; 4832 4833 list_for_each_entry(net, net_list, exit_list) { 4834 struct vxlan_net *vn = net_generic(net, vxlan_net_id); 4835 4836 unregister_nexthop_notifier(net, &vn->nexthop_notifier_block); 4837 } 4838 rtnl_lock(); 4839 list_for_each_entry(net, net_list, exit_list) 4840 vxlan_destroy_tunnels(net, &list); 4841 4842 unregister_netdevice_many(&list); 4843 rtnl_unlock(); 4844 4845 list_for_each_entry(net, net_list, exit_list) { 4846 struct vxlan_net *vn = net_generic(net, vxlan_net_id); 4847 4848 for (h = 0; h < PORT_HASH_SIZE; ++h) 4849 WARN_ON_ONCE(!hlist_empty(&vn->sock_list[h])); 4850 } 4851 } 4852 4853 static struct pernet_operations vxlan_net_ops = { 4854 .init = vxlan_init_net, 4855 .exit_batch = vxlan_exit_batch_net, 4856 .id = &vxlan_net_id, 4857 .size = sizeof(struct vxlan_net), 4858 }; 4859 4860 static int __init vxlan_init_module(void) 4861 { 4862 int rc; 4863 4864 get_random_bytes(&vxlan_salt, sizeof(vxlan_salt)); 4865 4866 rc = register_pernet_subsys(&vxlan_net_ops); 4867 if (rc) 4868 goto out1; 4869 4870 rc = register_netdevice_notifier(&vxlan_notifier_block); 4871 if (rc) 4872 goto out2; 4873 4874 rc = register_switchdev_notifier(&vxlan_switchdev_notifier_block); 4875 if (rc) 4876 goto out3; 4877 4878 rc = rtnl_link_register(&vxlan_link_ops); 4879 if (rc) 4880 goto out4; 4881 4882 vxlan_vnifilter_init(); 4883 4884 return 0; 4885 out4: 4886 unregister_switchdev_notifier(&vxlan_switchdev_notifier_block); 4887 out3: 4888 unregister_netdevice_notifier(&vxlan_notifier_block); 4889 out2: 4890 unregister_pernet_subsys(&vxlan_net_ops); 4891 out1: 4892 return rc; 4893 } 4894 late_initcall(vxlan_init_module); 4895 4896 static void __exit vxlan_cleanup_module(void) 4897 { 4898 vxlan_vnifilter_uninit(); 4899 rtnl_link_unregister(&vxlan_link_ops); 4900 unregister_switchdev_notifier(&vxlan_switchdev_notifier_block); 4901 unregister_netdevice_notifier(&vxlan_notifier_block); 4902 unregister_pernet_subsys(&vxlan_net_ops); 4903 /* rcu_barrier() is called by netns */ 4904 } 4905 module_exit(vxlan_cleanup_module); 4906 4907 MODULE_LICENSE("GPL"); 4908 MODULE_VERSION(VXLAN_VERSION); 4909 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>"); 4910 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic"); 4911 MODULE_ALIAS_RTNL_LINK("vxlan"); 4912