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 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); 281 } 282 283 static void vxlan_fdb_switchdev_notifier_info(const struct vxlan_dev *vxlan, 284 const struct vxlan_fdb *fdb, 285 const struct vxlan_rdst *rd, 286 struct netlink_ext_ack *extack, 287 struct switchdev_notifier_vxlan_fdb_info *fdb_info) 288 { 289 fdb_info->info.dev = vxlan->dev; 290 fdb_info->info.extack = extack; 291 fdb_info->remote_ip = rd->remote_ip; 292 fdb_info->remote_port = rd->remote_port; 293 fdb_info->remote_vni = rd->remote_vni; 294 fdb_info->remote_ifindex = rd->remote_ifindex; 295 memcpy(fdb_info->eth_addr, fdb->eth_addr, ETH_ALEN); 296 fdb_info->vni = fdb->vni; 297 fdb_info->offloaded = rd->offloaded; 298 fdb_info->added_by_user = fdb->flags & NTF_VXLAN_ADDED_BY_USER; 299 } 300 301 static int vxlan_fdb_switchdev_call_notifiers(struct vxlan_dev *vxlan, 302 struct vxlan_fdb *fdb, 303 struct vxlan_rdst *rd, 304 bool adding, 305 struct netlink_ext_ack *extack) 306 { 307 struct switchdev_notifier_vxlan_fdb_info info; 308 enum switchdev_notifier_type notifier_type; 309 int ret; 310 311 if (WARN_ON(!rd)) 312 return 0; 313 314 notifier_type = adding ? SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE 315 : SWITCHDEV_VXLAN_FDB_DEL_TO_DEVICE; 316 vxlan_fdb_switchdev_notifier_info(vxlan, fdb, rd, NULL, &info); 317 ret = call_switchdev_notifiers(notifier_type, vxlan->dev, 318 &info.info, extack); 319 return notifier_to_errno(ret); 320 } 321 322 static int vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb, 323 struct vxlan_rdst *rd, int type, bool swdev_notify, 324 struct netlink_ext_ack *extack) 325 { 326 int err; 327 328 if (swdev_notify && rd) { 329 switch (type) { 330 case RTM_NEWNEIGH: 331 err = vxlan_fdb_switchdev_call_notifiers(vxlan, fdb, rd, 332 true, extack); 333 if (err) 334 return err; 335 break; 336 case RTM_DELNEIGH: 337 vxlan_fdb_switchdev_call_notifiers(vxlan, fdb, rd, 338 false, extack); 339 break; 340 } 341 } 342 343 __vxlan_fdb_notify(vxlan, fdb, rd, type); 344 return 0; 345 } 346 347 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa) 348 { 349 struct vxlan_dev *vxlan = netdev_priv(dev); 350 struct vxlan_fdb f = { 351 .state = NUD_STALE, 352 }; 353 struct vxlan_rdst remote = { 354 .remote_ip = *ipa, /* goes to NDA_DST */ 355 .remote_vni = cpu_to_be32(VXLAN_N_VID), 356 }; 357 358 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH, true, NULL); 359 } 360 361 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN]) 362 { 363 struct vxlan_fdb f = { 364 .state = NUD_STALE, 365 }; 366 struct vxlan_rdst remote = { }; 367 368 memcpy(f.eth_addr, eth_addr, ETH_ALEN); 369 370 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH, true, NULL); 371 } 372 373 /* Hash Ethernet address */ 374 static u32 eth_hash(const unsigned char *addr) 375 { 376 u64 value = get_unaligned((u64 *)addr); 377 378 /* only want 6 bytes */ 379 #ifdef __BIG_ENDIAN 380 value >>= 16; 381 #else 382 value <<= 16; 383 #endif 384 return hash_64(value, FDB_HASH_BITS); 385 } 386 387 u32 eth_vni_hash(const unsigned char *addr, __be32 vni) 388 { 389 /* use 1 byte of OUI and 3 bytes of NIC */ 390 u32 key = get_unaligned((u32 *)(addr + 2)); 391 392 return jhash_2words(key, vni, vxlan_salt) & (FDB_HASH_SIZE - 1); 393 } 394 395 u32 fdb_head_index(struct vxlan_dev *vxlan, const u8 *mac, __be32 vni) 396 { 397 if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) 398 return eth_vni_hash(mac, vni); 399 else 400 return eth_hash(mac); 401 } 402 403 /* Hash chain to use given mac address */ 404 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan, 405 const u8 *mac, __be32 vni) 406 { 407 return &vxlan->fdb_head[fdb_head_index(vxlan, mac, vni)]; 408 } 409 410 /* Look up Ethernet address in forwarding table */ 411 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan, 412 const u8 *mac, __be32 vni) 413 { 414 struct hlist_head *head = vxlan_fdb_head(vxlan, mac, vni); 415 struct vxlan_fdb *f; 416 417 hlist_for_each_entry_rcu(f, head, hlist) { 418 if (ether_addr_equal(mac, f->eth_addr)) { 419 if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) { 420 if (vni == f->vni) 421 return f; 422 } else { 423 return f; 424 } 425 } 426 } 427 428 return NULL; 429 } 430 431 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan, 432 const u8 *mac, __be32 vni) 433 { 434 struct vxlan_fdb *f; 435 436 f = __vxlan_find_mac(vxlan, mac, vni); 437 if (f && f->used != jiffies) 438 f->used = jiffies; 439 440 return f; 441 } 442 443 /* caller should hold vxlan->hash_lock */ 444 static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f, 445 union vxlan_addr *ip, __be16 port, 446 __be32 vni, __u32 ifindex) 447 { 448 struct vxlan_rdst *rd; 449 450 list_for_each_entry(rd, &f->remotes, list) { 451 if (vxlan_addr_equal(&rd->remote_ip, ip) && 452 rd->remote_port == port && 453 rd->remote_vni == vni && 454 rd->remote_ifindex == ifindex) 455 return rd; 456 } 457 458 return NULL; 459 } 460 461 int vxlan_fdb_find_uc(struct net_device *dev, const u8 *mac, __be32 vni, 462 struct switchdev_notifier_vxlan_fdb_info *fdb_info) 463 { 464 struct vxlan_dev *vxlan = netdev_priv(dev); 465 u8 eth_addr[ETH_ALEN + 2] = { 0 }; 466 struct vxlan_rdst *rdst; 467 struct vxlan_fdb *f; 468 int rc = 0; 469 470 if (is_multicast_ether_addr(mac) || 471 is_zero_ether_addr(mac)) 472 return -EINVAL; 473 474 ether_addr_copy(eth_addr, mac); 475 476 rcu_read_lock(); 477 478 f = __vxlan_find_mac(vxlan, eth_addr, vni); 479 if (!f) { 480 rc = -ENOENT; 481 goto out; 482 } 483 484 rdst = first_remote_rcu(f); 485 vxlan_fdb_switchdev_notifier_info(vxlan, f, rdst, NULL, fdb_info); 486 487 out: 488 rcu_read_unlock(); 489 return rc; 490 } 491 EXPORT_SYMBOL_GPL(vxlan_fdb_find_uc); 492 493 static int vxlan_fdb_notify_one(struct notifier_block *nb, 494 const struct vxlan_dev *vxlan, 495 const struct vxlan_fdb *f, 496 const struct vxlan_rdst *rdst, 497 struct netlink_ext_ack *extack) 498 { 499 struct switchdev_notifier_vxlan_fdb_info fdb_info; 500 int rc; 501 502 vxlan_fdb_switchdev_notifier_info(vxlan, f, rdst, extack, &fdb_info); 503 rc = nb->notifier_call(nb, SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE, 504 &fdb_info); 505 return notifier_to_errno(rc); 506 } 507 508 int vxlan_fdb_replay(const struct net_device *dev, __be32 vni, 509 struct notifier_block *nb, 510 struct netlink_ext_ack *extack) 511 { 512 struct vxlan_dev *vxlan; 513 struct vxlan_rdst *rdst; 514 struct vxlan_fdb *f; 515 unsigned int h; 516 int rc = 0; 517 518 if (!netif_is_vxlan(dev)) 519 return -EINVAL; 520 vxlan = netdev_priv(dev); 521 522 for (h = 0; h < FDB_HASH_SIZE; ++h) { 523 spin_lock_bh(&vxlan->hash_lock[h]); 524 hlist_for_each_entry(f, &vxlan->fdb_head[h], hlist) { 525 if (f->vni == vni) { 526 list_for_each_entry(rdst, &f->remotes, list) { 527 rc = vxlan_fdb_notify_one(nb, vxlan, 528 f, rdst, 529 extack); 530 if (rc) 531 goto unlock; 532 } 533 } 534 } 535 spin_unlock_bh(&vxlan->hash_lock[h]); 536 } 537 return 0; 538 539 unlock: 540 spin_unlock_bh(&vxlan->hash_lock[h]); 541 return rc; 542 } 543 EXPORT_SYMBOL_GPL(vxlan_fdb_replay); 544 545 void vxlan_fdb_clear_offload(const struct net_device *dev, __be32 vni) 546 { 547 struct vxlan_dev *vxlan; 548 struct vxlan_rdst *rdst; 549 struct vxlan_fdb *f; 550 unsigned int h; 551 552 if (!netif_is_vxlan(dev)) 553 return; 554 vxlan = netdev_priv(dev); 555 556 for (h = 0; h < FDB_HASH_SIZE; ++h) { 557 spin_lock_bh(&vxlan->hash_lock[h]); 558 hlist_for_each_entry(f, &vxlan->fdb_head[h], hlist) 559 if (f->vni == vni) 560 list_for_each_entry(rdst, &f->remotes, list) 561 rdst->offloaded = false; 562 spin_unlock_bh(&vxlan->hash_lock[h]); 563 } 564 565 } 566 EXPORT_SYMBOL_GPL(vxlan_fdb_clear_offload); 567 568 /* Replace destination of unicast mac */ 569 static int vxlan_fdb_replace(struct vxlan_fdb *f, 570 union vxlan_addr *ip, __be16 port, __be32 vni, 571 __u32 ifindex, struct vxlan_rdst *oldrd) 572 { 573 struct vxlan_rdst *rd; 574 575 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex); 576 if (rd) 577 return 0; 578 579 rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list); 580 if (!rd) 581 return 0; 582 583 *oldrd = *rd; 584 dst_cache_reset(&rd->dst_cache); 585 rd->remote_ip = *ip; 586 rd->remote_port = port; 587 rd->remote_vni = vni; 588 rd->remote_ifindex = ifindex; 589 rd->offloaded = false; 590 return 1; 591 } 592 593 /* Add/update destinations for multicast */ 594 static int vxlan_fdb_append(struct vxlan_fdb *f, 595 union vxlan_addr *ip, __be16 port, __be32 vni, 596 __u32 ifindex, struct vxlan_rdst **rdp) 597 { 598 struct vxlan_rdst *rd; 599 600 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex); 601 if (rd) 602 return 0; 603 604 rd = kmalloc(sizeof(*rd), GFP_ATOMIC); 605 if (rd == NULL) 606 return -ENOMEM; 607 608 if (dst_cache_init(&rd->dst_cache, GFP_ATOMIC)) { 609 kfree(rd); 610 return -ENOMEM; 611 } 612 613 rd->remote_ip = *ip; 614 rd->remote_port = port; 615 rd->offloaded = false; 616 rd->remote_vni = vni; 617 rd->remote_ifindex = ifindex; 618 619 list_add_tail_rcu(&rd->list, &f->remotes); 620 621 *rdp = rd; 622 return 1; 623 } 624 625 static bool vxlan_parse_gpe_proto(struct vxlanhdr *hdr, __be16 *protocol) 626 { 627 struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)hdr; 628 629 /* Need to have Next Protocol set for interfaces in GPE mode. */ 630 if (!gpe->np_applied) 631 return false; 632 /* "The initial version is 0. If a receiver does not support the 633 * version indicated it MUST drop the packet. 634 */ 635 if (gpe->version != 0) 636 return false; 637 /* "When the O bit is set to 1, the packet is an OAM packet and OAM 638 * processing MUST occur." However, we don't implement OAM 639 * processing, thus drop the packet. 640 */ 641 if (gpe->oam_flag) 642 return false; 643 644 *protocol = tun_p_to_eth_p(gpe->next_protocol); 645 if (!*protocol) 646 return false; 647 648 return true; 649 } 650 651 static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb, 652 unsigned int off, 653 struct vxlanhdr *vh, size_t hdrlen, 654 __be32 vni_field, 655 struct gro_remcsum *grc, 656 bool nopartial) 657 { 658 size_t start, offset; 659 660 if (skb->remcsum_offload) 661 return vh; 662 663 if (!NAPI_GRO_CB(skb)->csum_valid) 664 return NULL; 665 666 start = vxlan_rco_start(vni_field); 667 offset = start + vxlan_rco_offset(vni_field); 668 669 vh = skb_gro_remcsum_process(skb, (void *)vh, off, hdrlen, 670 start, offset, grc, nopartial); 671 672 skb->remcsum_offload = 1; 673 674 return vh; 675 } 676 677 static struct vxlanhdr *vxlan_gro_prepare_receive(struct sock *sk, 678 struct list_head *head, 679 struct sk_buff *skb, 680 struct gro_remcsum *grc) 681 { 682 struct sk_buff *p; 683 struct vxlanhdr *vh, *vh2; 684 unsigned int hlen, off_vx; 685 struct vxlan_sock *vs = rcu_dereference_sk_user_data(sk); 686 __be32 flags; 687 688 skb_gro_remcsum_init(grc); 689 690 off_vx = skb_gro_offset(skb); 691 hlen = off_vx + sizeof(*vh); 692 vh = skb_gro_header(skb, hlen, off_vx); 693 if (unlikely(!vh)) 694 return NULL; 695 696 skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr)); 697 698 flags = vh->vx_flags; 699 700 if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) { 701 vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr), 702 vh->vx_vni, grc, 703 !!(vs->flags & 704 VXLAN_F_REMCSUM_NOPARTIAL)); 705 706 if (!vh) 707 return NULL; 708 } 709 710 skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */ 711 712 list_for_each_entry(p, head, list) { 713 if (!NAPI_GRO_CB(p)->same_flow) 714 continue; 715 716 vh2 = (struct vxlanhdr *)(p->data + off_vx); 717 if (vh->vx_flags != vh2->vx_flags || 718 vh->vx_vni != vh2->vx_vni) { 719 NAPI_GRO_CB(p)->same_flow = 0; 720 continue; 721 } 722 } 723 724 return vh; 725 } 726 727 static struct sk_buff *vxlan_gro_receive(struct sock *sk, 728 struct list_head *head, 729 struct sk_buff *skb) 730 { 731 struct sk_buff *pp = NULL; 732 struct gro_remcsum grc; 733 int flush = 1; 734 735 if (vxlan_gro_prepare_receive(sk, head, skb, &grc)) { 736 pp = call_gro_receive(eth_gro_receive, head, skb); 737 flush = 0; 738 } 739 skb_gro_flush_final_remcsum(skb, pp, flush, &grc); 740 return pp; 741 } 742 743 static struct sk_buff *vxlan_gpe_gro_receive(struct sock *sk, 744 struct list_head *head, 745 struct sk_buff *skb) 746 { 747 const struct packet_offload *ptype; 748 struct sk_buff *pp = NULL; 749 struct gro_remcsum grc; 750 struct vxlanhdr *vh; 751 __be16 protocol; 752 int flush = 1; 753 754 vh = vxlan_gro_prepare_receive(sk, head, skb, &grc); 755 if (vh) { 756 if (!vxlan_parse_gpe_proto(vh, &protocol)) 757 goto out; 758 ptype = gro_find_receive_by_type(protocol); 759 if (!ptype) 760 goto out; 761 pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb); 762 flush = 0; 763 } 764 out: 765 skb_gro_flush_final_remcsum(skb, pp, flush, &grc); 766 return pp; 767 } 768 769 static int vxlan_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff) 770 { 771 /* Sets 'skb->inner_mac_header' since we are always called with 772 * 'skb->encapsulation' set. 773 */ 774 return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr)); 775 } 776 777 static int vxlan_gpe_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff) 778 { 779 struct vxlanhdr *vh = (struct vxlanhdr *)(skb->data + nhoff); 780 const struct packet_offload *ptype; 781 int err = -ENOSYS; 782 __be16 protocol; 783 784 if (!vxlan_parse_gpe_proto(vh, &protocol)) 785 return err; 786 ptype = gro_find_complete_by_type(protocol); 787 if (ptype) 788 err = ptype->callbacks.gro_complete(skb, nhoff + sizeof(struct vxlanhdr)); 789 return err; 790 } 791 792 static struct vxlan_fdb *vxlan_fdb_alloc(struct vxlan_dev *vxlan, const u8 *mac, 793 __u16 state, __be32 src_vni, 794 __u16 ndm_flags) 795 { 796 struct vxlan_fdb *f; 797 798 f = kmalloc(sizeof(*f), GFP_ATOMIC); 799 if (!f) 800 return NULL; 801 f->state = state; 802 f->flags = ndm_flags; 803 f->updated = f->used = jiffies; 804 f->vni = src_vni; 805 f->nh = NULL; 806 RCU_INIT_POINTER(f->vdev, vxlan); 807 INIT_LIST_HEAD(&f->nh_list); 808 INIT_LIST_HEAD(&f->remotes); 809 memcpy(f->eth_addr, mac, ETH_ALEN); 810 811 return f; 812 } 813 814 static void vxlan_fdb_insert(struct vxlan_dev *vxlan, const u8 *mac, 815 __be32 src_vni, struct vxlan_fdb *f) 816 { 817 ++vxlan->addrcnt; 818 hlist_add_head_rcu(&f->hlist, 819 vxlan_fdb_head(vxlan, mac, src_vni)); 820 } 821 822 static int vxlan_fdb_nh_update(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb, 823 u32 nhid, struct netlink_ext_ack *extack) 824 { 825 struct nexthop *old_nh = rtnl_dereference(fdb->nh); 826 struct nexthop *nh; 827 int err = -EINVAL; 828 829 if (old_nh && old_nh->id == nhid) 830 return 0; 831 832 nh = nexthop_find_by_id(vxlan->net, nhid); 833 if (!nh) { 834 NL_SET_ERR_MSG(extack, "Nexthop id does not exist"); 835 goto err_inval; 836 } 837 838 if (!nexthop_get(nh)) { 839 NL_SET_ERR_MSG(extack, "Nexthop has been deleted"); 840 nh = NULL; 841 goto err_inval; 842 } 843 if (!nexthop_is_fdb(nh)) { 844 NL_SET_ERR_MSG(extack, "Nexthop is not a fdb nexthop"); 845 goto err_inval; 846 } 847 848 if (!nexthop_is_multipath(nh)) { 849 NL_SET_ERR_MSG(extack, "Nexthop is not a multipath group"); 850 goto err_inval; 851 } 852 853 /* check nexthop group family */ 854 switch (vxlan->default_dst.remote_ip.sa.sa_family) { 855 case AF_INET: 856 if (!nexthop_has_v4(nh)) { 857 err = -EAFNOSUPPORT; 858 NL_SET_ERR_MSG(extack, "Nexthop group family not supported"); 859 goto err_inval; 860 } 861 break; 862 case AF_INET6: 863 if (nexthop_has_v4(nh)) { 864 err = -EAFNOSUPPORT; 865 NL_SET_ERR_MSG(extack, "Nexthop group family not supported"); 866 goto err_inval; 867 } 868 } 869 870 if (old_nh) { 871 list_del_rcu(&fdb->nh_list); 872 nexthop_put(old_nh); 873 } 874 rcu_assign_pointer(fdb->nh, nh); 875 list_add_tail_rcu(&fdb->nh_list, &nh->fdb_list); 876 return 1; 877 878 err_inval: 879 if (nh) 880 nexthop_put(nh); 881 return err; 882 } 883 884 int vxlan_fdb_create(struct vxlan_dev *vxlan, 885 const u8 *mac, union vxlan_addr *ip, 886 __u16 state, __be16 port, __be32 src_vni, 887 __be32 vni, __u32 ifindex, __u16 ndm_flags, 888 u32 nhid, struct vxlan_fdb **fdb, 889 struct netlink_ext_ack *extack) 890 { 891 struct vxlan_rdst *rd = NULL; 892 struct vxlan_fdb *f; 893 int rc; 894 895 if (vxlan->cfg.addrmax && 896 vxlan->addrcnt >= vxlan->cfg.addrmax) 897 return -ENOSPC; 898 899 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip); 900 f = vxlan_fdb_alloc(vxlan, mac, state, src_vni, ndm_flags); 901 if (!f) 902 return -ENOMEM; 903 904 if (nhid) 905 rc = vxlan_fdb_nh_update(vxlan, f, nhid, extack); 906 else 907 rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd); 908 if (rc < 0) 909 goto errout; 910 911 *fdb = f; 912 913 return 0; 914 915 errout: 916 kfree(f); 917 return rc; 918 } 919 920 static void __vxlan_fdb_free(struct vxlan_fdb *f) 921 { 922 struct vxlan_rdst *rd, *nd; 923 struct nexthop *nh; 924 925 nh = rcu_dereference_raw(f->nh); 926 if (nh) { 927 rcu_assign_pointer(f->nh, NULL); 928 rcu_assign_pointer(f->vdev, NULL); 929 nexthop_put(nh); 930 } 931 932 list_for_each_entry_safe(rd, nd, &f->remotes, list) { 933 dst_cache_destroy(&rd->dst_cache); 934 kfree(rd); 935 } 936 kfree(f); 937 } 938 939 static void vxlan_fdb_free(struct rcu_head *head) 940 { 941 struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu); 942 943 __vxlan_fdb_free(f); 944 } 945 946 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f, 947 bool do_notify, bool swdev_notify) 948 { 949 struct vxlan_rdst *rd; 950 951 netdev_dbg(vxlan->dev, "delete %pM\n", f->eth_addr); 952 953 --vxlan->addrcnt; 954 if (do_notify) { 955 if (rcu_access_pointer(f->nh)) 956 vxlan_fdb_notify(vxlan, f, NULL, RTM_DELNEIGH, 957 swdev_notify, NULL); 958 else 959 list_for_each_entry(rd, &f->remotes, list) 960 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH, 961 swdev_notify, NULL); 962 } 963 964 hlist_del_rcu(&f->hlist); 965 list_del_rcu(&f->nh_list); 966 call_rcu(&f->rcu, vxlan_fdb_free); 967 } 968 969 static void vxlan_dst_free(struct rcu_head *head) 970 { 971 struct vxlan_rdst *rd = container_of(head, struct vxlan_rdst, rcu); 972 973 dst_cache_destroy(&rd->dst_cache); 974 kfree(rd); 975 } 976 977 static int vxlan_fdb_update_existing(struct vxlan_dev *vxlan, 978 union vxlan_addr *ip, 979 __u16 state, __u16 flags, 980 __be16 port, __be32 vni, 981 __u32 ifindex, __u16 ndm_flags, 982 struct vxlan_fdb *f, u32 nhid, 983 bool swdev_notify, 984 struct netlink_ext_ack *extack) 985 { 986 __u16 fdb_flags = (ndm_flags & ~NTF_USE); 987 struct vxlan_rdst *rd = NULL; 988 struct vxlan_rdst oldrd; 989 int notify = 0; 990 int rc = 0; 991 int err; 992 993 if (nhid && !rcu_access_pointer(f->nh)) { 994 NL_SET_ERR_MSG(extack, 995 "Cannot replace an existing non nexthop fdb with a nexthop"); 996 return -EOPNOTSUPP; 997 } 998 999 if (nhid && (flags & NLM_F_APPEND)) { 1000 NL_SET_ERR_MSG(extack, 1001 "Cannot append to a nexthop fdb"); 1002 return -EOPNOTSUPP; 1003 } 1004 1005 /* Do not allow an externally learned entry to take over an entry added 1006 * by the user. 1007 */ 1008 if (!(fdb_flags & NTF_EXT_LEARNED) || 1009 !(f->flags & NTF_VXLAN_ADDED_BY_USER)) { 1010 if (f->state != state) { 1011 f->state = state; 1012 f->updated = jiffies; 1013 notify = 1; 1014 } 1015 if (f->flags != fdb_flags) { 1016 f->flags = fdb_flags; 1017 f->updated = jiffies; 1018 notify = 1; 1019 } 1020 } 1021 1022 if ((flags & NLM_F_REPLACE)) { 1023 /* Only change unicasts */ 1024 if (!(is_multicast_ether_addr(f->eth_addr) || 1025 is_zero_ether_addr(f->eth_addr))) { 1026 if (nhid) { 1027 rc = vxlan_fdb_nh_update(vxlan, f, nhid, extack); 1028 if (rc < 0) 1029 return rc; 1030 } else { 1031 rc = vxlan_fdb_replace(f, ip, port, vni, 1032 ifindex, &oldrd); 1033 } 1034 notify |= rc; 1035 } else { 1036 NL_SET_ERR_MSG(extack, "Cannot replace non-unicast fdb entries"); 1037 return -EOPNOTSUPP; 1038 } 1039 } 1040 if ((flags & NLM_F_APPEND) && 1041 (is_multicast_ether_addr(f->eth_addr) || 1042 is_zero_ether_addr(f->eth_addr))) { 1043 rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd); 1044 1045 if (rc < 0) 1046 return rc; 1047 notify |= rc; 1048 } 1049 1050 if (ndm_flags & NTF_USE) 1051 f->used = jiffies; 1052 1053 if (notify) { 1054 if (rd == NULL) 1055 rd = first_remote_rtnl(f); 1056 1057 err = vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH, 1058 swdev_notify, extack); 1059 if (err) 1060 goto err_notify; 1061 } 1062 1063 return 0; 1064 1065 err_notify: 1066 if (nhid) 1067 return err; 1068 if ((flags & NLM_F_REPLACE) && rc) 1069 *rd = oldrd; 1070 else if ((flags & NLM_F_APPEND) && rc) { 1071 list_del_rcu(&rd->list); 1072 call_rcu(&rd->rcu, vxlan_dst_free); 1073 } 1074 return err; 1075 } 1076 1077 static int vxlan_fdb_update_create(struct vxlan_dev *vxlan, 1078 const u8 *mac, union vxlan_addr *ip, 1079 __u16 state, __u16 flags, 1080 __be16 port, __be32 src_vni, __be32 vni, 1081 __u32 ifindex, __u16 ndm_flags, u32 nhid, 1082 bool swdev_notify, 1083 struct netlink_ext_ack *extack) 1084 { 1085 __u16 fdb_flags = (ndm_flags & ~NTF_USE); 1086 struct vxlan_fdb *f; 1087 int rc; 1088 1089 /* Disallow replace to add a multicast entry */ 1090 if ((flags & NLM_F_REPLACE) && 1091 (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac))) 1092 return -EOPNOTSUPP; 1093 1094 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip); 1095 rc = vxlan_fdb_create(vxlan, mac, ip, state, port, src_vni, 1096 vni, ifindex, fdb_flags, nhid, &f, extack); 1097 if (rc < 0) 1098 return rc; 1099 1100 vxlan_fdb_insert(vxlan, mac, src_vni, f); 1101 rc = vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_NEWNEIGH, 1102 swdev_notify, extack); 1103 if (rc) 1104 goto err_notify; 1105 1106 return 0; 1107 1108 err_notify: 1109 vxlan_fdb_destroy(vxlan, f, false, false); 1110 return rc; 1111 } 1112 1113 /* Add new entry to forwarding table -- assumes lock held */ 1114 int vxlan_fdb_update(struct vxlan_dev *vxlan, 1115 const u8 *mac, union vxlan_addr *ip, 1116 __u16 state, __u16 flags, 1117 __be16 port, __be32 src_vni, __be32 vni, 1118 __u32 ifindex, __u16 ndm_flags, u32 nhid, 1119 bool swdev_notify, 1120 struct netlink_ext_ack *extack) 1121 { 1122 struct vxlan_fdb *f; 1123 1124 f = __vxlan_find_mac(vxlan, mac, src_vni); 1125 if (f) { 1126 if (flags & NLM_F_EXCL) { 1127 netdev_dbg(vxlan->dev, 1128 "lost race to create %pM\n", mac); 1129 return -EEXIST; 1130 } 1131 1132 return vxlan_fdb_update_existing(vxlan, ip, state, flags, port, 1133 vni, ifindex, ndm_flags, f, 1134 nhid, swdev_notify, extack); 1135 } else { 1136 if (!(flags & NLM_F_CREATE)) 1137 return -ENOENT; 1138 1139 return vxlan_fdb_update_create(vxlan, mac, ip, state, flags, 1140 port, src_vni, vni, ifindex, 1141 ndm_flags, nhid, swdev_notify, 1142 extack); 1143 } 1144 } 1145 1146 static void vxlan_fdb_dst_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f, 1147 struct vxlan_rdst *rd, bool swdev_notify) 1148 { 1149 list_del_rcu(&rd->list); 1150 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH, swdev_notify, NULL); 1151 call_rcu(&rd->rcu, vxlan_dst_free); 1152 } 1153 1154 static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan, 1155 union vxlan_addr *ip, __be16 *port, __be32 *src_vni, 1156 __be32 *vni, u32 *ifindex, u32 *nhid, 1157 struct netlink_ext_ack *extack) 1158 { 1159 struct net *net = dev_net(vxlan->dev); 1160 int err; 1161 1162 if (tb[NDA_NH_ID] && 1163 (tb[NDA_DST] || tb[NDA_VNI] || tb[NDA_IFINDEX] || tb[NDA_PORT])) { 1164 NL_SET_ERR_MSG(extack, "DST, VNI, ifindex and port are mutually exclusive with NH_ID"); 1165 return -EINVAL; 1166 } 1167 1168 if (tb[NDA_DST]) { 1169 err = vxlan_nla_get_addr(ip, tb[NDA_DST]); 1170 if (err) { 1171 NL_SET_ERR_MSG(extack, "Unsupported address family"); 1172 return err; 1173 } 1174 } else { 1175 union vxlan_addr *remote = &vxlan->default_dst.remote_ip; 1176 1177 if (remote->sa.sa_family == AF_INET) { 1178 ip->sin.sin_addr.s_addr = htonl(INADDR_ANY); 1179 ip->sa.sa_family = AF_INET; 1180 #if IS_ENABLED(CONFIG_IPV6) 1181 } else { 1182 ip->sin6.sin6_addr = in6addr_any; 1183 ip->sa.sa_family = AF_INET6; 1184 #endif 1185 } 1186 } 1187 1188 if (tb[NDA_PORT]) { 1189 if (nla_len(tb[NDA_PORT]) != sizeof(__be16)) { 1190 NL_SET_ERR_MSG(extack, "Invalid vxlan port"); 1191 return -EINVAL; 1192 } 1193 *port = nla_get_be16(tb[NDA_PORT]); 1194 } else { 1195 *port = vxlan->cfg.dst_port; 1196 } 1197 1198 if (tb[NDA_VNI]) { 1199 if (nla_len(tb[NDA_VNI]) != sizeof(u32)) { 1200 NL_SET_ERR_MSG(extack, "Invalid vni"); 1201 return -EINVAL; 1202 } 1203 *vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI])); 1204 } else { 1205 *vni = vxlan->default_dst.remote_vni; 1206 } 1207 1208 if (tb[NDA_SRC_VNI]) { 1209 if (nla_len(tb[NDA_SRC_VNI]) != sizeof(u32)) { 1210 NL_SET_ERR_MSG(extack, "Invalid src vni"); 1211 return -EINVAL; 1212 } 1213 *src_vni = cpu_to_be32(nla_get_u32(tb[NDA_SRC_VNI])); 1214 } else { 1215 *src_vni = vxlan->default_dst.remote_vni; 1216 } 1217 1218 if (tb[NDA_IFINDEX]) { 1219 struct net_device *tdev; 1220 1221 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32)) { 1222 NL_SET_ERR_MSG(extack, "Invalid ifindex"); 1223 return -EINVAL; 1224 } 1225 *ifindex = nla_get_u32(tb[NDA_IFINDEX]); 1226 tdev = __dev_get_by_index(net, *ifindex); 1227 if (!tdev) { 1228 NL_SET_ERR_MSG(extack, "Device not found"); 1229 return -EADDRNOTAVAIL; 1230 } 1231 } else { 1232 *ifindex = 0; 1233 } 1234 1235 if (tb[NDA_NH_ID]) 1236 *nhid = nla_get_u32(tb[NDA_NH_ID]); 1237 else 1238 *nhid = 0; 1239 1240 return 0; 1241 } 1242 1243 /* Add static entry (via netlink) */ 1244 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[], 1245 struct net_device *dev, 1246 const unsigned char *addr, u16 vid, u16 flags, 1247 struct netlink_ext_ack *extack) 1248 { 1249 struct vxlan_dev *vxlan = netdev_priv(dev); 1250 /* struct net *net = dev_net(vxlan->dev); */ 1251 union vxlan_addr ip; 1252 __be16 port; 1253 __be32 src_vni, vni; 1254 u32 ifindex, nhid; 1255 u32 hash_index; 1256 int err; 1257 1258 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) { 1259 pr_info("RTM_NEWNEIGH with invalid state %#x\n", 1260 ndm->ndm_state); 1261 return -EINVAL; 1262 } 1263 1264 if (!tb || (!tb[NDA_DST] && !tb[NDA_NH_ID])) 1265 return -EINVAL; 1266 1267 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex, 1268 &nhid, extack); 1269 if (err) 1270 return err; 1271 1272 if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family) 1273 return -EAFNOSUPPORT; 1274 1275 hash_index = fdb_head_index(vxlan, addr, src_vni); 1276 spin_lock_bh(&vxlan->hash_lock[hash_index]); 1277 err = vxlan_fdb_update(vxlan, addr, &ip, ndm->ndm_state, flags, 1278 port, src_vni, vni, ifindex, 1279 ndm->ndm_flags | NTF_VXLAN_ADDED_BY_USER, 1280 nhid, true, extack); 1281 spin_unlock_bh(&vxlan->hash_lock[hash_index]); 1282 1283 return err; 1284 } 1285 1286 int __vxlan_fdb_delete(struct vxlan_dev *vxlan, 1287 const unsigned char *addr, union vxlan_addr ip, 1288 __be16 port, __be32 src_vni, __be32 vni, 1289 u32 ifindex, bool swdev_notify) 1290 { 1291 struct vxlan_rdst *rd = NULL; 1292 struct vxlan_fdb *f; 1293 int err = -ENOENT; 1294 1295 f = vxlan_find_mac(vxlan, addr, src_vni); 1296 if (!f) 1297 return err; 1298 1299 if (!vxlan_addr_any(&ip)) { 1300 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex); 1301 if (!rd) 1302 goto out; 1303 } 1304 1305 /* remove a destination if it's not the only one on the list, 1306 * otherwise destroy the fdb entry 1307 */ 1308 if (rd && !list_is_singular(&f->remotes)) { 1309 vxlan_fdb_dst_destroy(vxlan, f, rd, swdev_notify); 1310 goto out; 1311 } 1312 1313 vxlan_fdb_destroy(vxlan, f, true, swdev_notify); 1314 1315 out: 1316 return 0; 1317 } 1318 1319 /* Delete entry (via netlink) */ 1320 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[], 1321 struct net_device *dev, 1322 const unsigned char *addr, u16 vid, 1323 struct netlink_ext_ack *extack) 1324 { 1325 struct vxlan_dev *vxlan = netdev_priv(dev); 1326 union vxlan_addr ip; 1327 __be32 src_vni, vni; 1328 u32 ifindex, nhid; 1329 u32 hash_index; 1330 __be16 port; 1331 int err; 1332 1333 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex, 1334 &nhid, extack); 1335 if (err) 1336 return err; 1337 1338 hash_index = fdb_head_index(vxlan, addr, src_vni); 1339 spin_lock_bh(&vxlan->hash_lock[hash_index]); 1340 err = __vxlan_fdb_delete(vxlan, addr, ip, port, src_vni, vni, ifindex, 1341 true); 1342 spin_unlock_bh(&vxlan->hash_lock[hash_index]); 1343 1344 return err; 1345 } 1346 1347 /* Dump forwarding table */ 1348 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb, 1349 struct net_device *dev, 1350 struct net_device *filter_dev, int *idx) 1351 { 1352 struct vxlan_dev *vxlan = netdev_priv(dev); 1353 unsigned int h; 1354 int err = 0; 1355 1356 for (h = 0; h < FDB_HASH_SIZE; ++h) { 1357 struct vxlan_fdb *f; 1358 1359 rcu_read_lock(); 1360 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) { 1361 struct vxlan_rdst *rd; 1362 1363 if (rcu_access_pointer(f->nh)) { 1364 if (*idx < cb->args[2]) 1365 goto skip_nh; 1366 err = vxlan_fdb_info(skb, vxlan, f, 1367 NETLINK_CB(cb->skb).portid, 1368 cb->nlh->nlmsg_seq, 1369 RTM_NEWNEIGH, 1370 NLM_F_MULTI, NULL); 1371 if (err < 0) { 1372 rcu_read_unlock(); 1373 goto out; 1374 } 1375 skip_nh: 1376 *idx += 1; 1377 continue; 1378 } 1379 1380 list_for_each_entry_rcu(rd, &f->remotes, list) { 1381 if (*idx < cb->args[2]) 1382 goto skip; 1383 1384 err = vxlan_fdb_info(skb, vxlan, f, 1385 NETLINK_CB(cb->skb).portid, 1386 cb->nlh->nlmsg_seq, 1387 RTM_NEWNEIGH, 1388 NLM_F_MULTI, rd); 1389 if (err < 0) { 1390 rcu_read_unlock(); 1391 goto out; 1392 } 1393 skip: 1394 *idx += 1; 1395 } 1396 } 1397 rcu_read_unlock(); 1398 } 1399 out: 1400 return err; 1401 } 1402 1403 static int vxlan_fdb_get(struct sk_buff *skb, 1404 struct nlattr *tb[], 1405 struct net_device *dev, 1406 const unsigned char *addr, 1407 u16 vid, u32 portid, u32 seq, 1408 struct netlink_ext_ack *extack) 1409 { 1410 struct vxlan_dev *vxlan = netdev_priv(dev); 1411 struct vxlan_fdb *f; 1412 __be32 vni; 1413 int err; 1414 1415 if (tb[NDA_VNI]) 1416 vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI])); 1417 else 1418 vni = vxlan->default_dst.remote_vni; 1419 1420 rcu_read_lock(); 1421 1422 f = __vxlan_find_mac(vxlan, addr, vni); 1423 if (!f) { 1424 NL_SET_ERR_MSG(extack, "Fdb entry not found"); 1425 err = -ENOENT; 1426 goto errout; 1427 } 1428 1429 err = vxlan_fdb_info(skb, vxlan, f, portid, seq, 1430 RTM_NEWNEIGH, 0, first_remote_rcu(f)); 1431 errout: 1432 rcu_read_unlock(); 1433 return err; 1434 } 1435 1436 /* Watch incoming packets to learn mapping between Ethernet address 1437 * and Tunnel endpoint. 1438 * Return true if packet is bogus and should be dropped. 1439 */ 1440 static enum skb_drop_reason vxlan_snoop(struct net_device *dev, 1441 union vxlan_addr *src_ip, 1442 const u8 *src_mac, u32 src_ifindex, 1443 __be32 vni) 1444 { 1445 struct vxlan_dev *vxlan = netdev_priv(dev); 1446 struct vxlan_fdb *f; 1447 u32 ifindex = 0; 1448 1449 /* Ignore packets from invalid src-address */ 1450 if (!is_valid_ether_addr(src_mac)) 1451 return SKB_DROP_REASON_MAC_INVALID_SOURCE; 1452 1453 #if IS_ENABLED(CONFIG_IPV6) 1454 if (src_ip->sa.sa_family == AF_INET6 && 1455 (ipv6_addr_type(&src_ip->sin6.sin6_addr) & IPV6_ADDR_LINKLOCAL)) 1456 ifindex = src_ifindex; 1457 #endif 1458 1459 f = vxlan_find_mac(vxlan, src_mac, vni); 1460 if (likely(f)) { 1461 struct vxlan_rdst *rdst = first_remote_rcu(f); 1462 1463 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip) && 1464 rdst->remote_ifindex == ifindex)) 1465 return SKB_NOT_DROPPED_YET; 1466 1467 /* Don't migrate static entries, drop packets */ 1468 if (f->state & (NUD_PERMANENT | NUD_NOARP)) 1469 return SKB_DROP_REASON_VXLAN_ENTRY_EXISTS; 1470 1471 /* Don't override an fdb with nexthop with a learnt entry */ 1472 if (rcu_access_pointer(f->nh)) 1473 return SKB_DROP_REASON_VXLAN_ENTRY_EXISTS; 1474 1475 if (net_ratelimit()) 1476 netdev_info(dev, 1477 "%pM migrated from %pIS to %pIS\n", 1478 src_mac, &rdst->remote_ip.sa, &src_ip->sa); 1479 1480 rdst->remote_ip = *src_ip; 1481 f->updated = jiffies; 1482 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH, true, NULL); 1483 } else { 1484 u32 hash_index = fdb_head_index(vxlan, src_mac, vni); 1485 1486 /* learned new entry */ 1487 spin_lock(&vxlan->hash_lock[hash_index]); 1488 1489 /* close off race between vxlan_flush and incoming packets */ 1490 if (netif_running(dev)) 1491 vxlan_fdb_update(vxlan, src_mac, src_ip, 1492 NUD_REACHABLE, 1493 NLM_F_EXCL|NLM_F_CREATE, 1494 vxlan->cfg.dst_port, 1495 vni, 1496 vxlan->default_dst.remote_vni, 1497 ifindex, NTF_SELF, 0, true, NULL); 1498 spin_unlock(&vxlan->hash_lock[hash_index]); 1499 } 1500 1501 return SKB_NOT_DROPPED_YET; 1502 } 1503 1504 static bool __vxlan_sock_release_prep(struct vxlan_sock *vs) 1505 { 1506 struct vxlan_net *vn; 1507 1508 if (!vs) 1509 return false; 1510 if (!refcount_dec_and_test(&vs->refcnt)) 1511 return false; 1512 1513 vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id); 1514 spin_lock(&vn->sock_lock); 1515 hlist_del_rcu(&vs->hlist); 1516 udp_tunnel_notify_del_rx_port(vs->sock, 1517 (vs->flags & VXLAN_F_GPE) ? 1518 UDP_TUNNEL_TYPE_VXLAN_GPE : 1519 UDP_TUNNEL_TYPE_VXLAN); 1520 spin_unlock(&vn->sock_lock); 1521 1522 return true; 1523 } 1524 1525 static void vxlan_sock_release(struct vxlan_dev *vxlan) 1526 { 1527 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock); 1528 #if IS_ENABLED(CONFIG_IPV6) 1529 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock); 1530 1531 RCU_INIT_POINTER(vxlan->vn6_sock, NULL); 1532 #endif 1533 1534 RCU_INIT_POINTER(vxlan->vn4_sock, NULL); 1535 synchronize_net(); 1536 1537 if (vxlan->cfg.flags & VXLAN_F_VNIFILTER) 1538 vxlan_vs_del_vnigrp(vxlan); 1539 else 1540 vxlan_vs_del_dev(vxlan); 1541 1542 if (__vxlan_sock_release_prep(sock4)) { 1543 udp_tunnel_sock_release(sock4->sock); 1544 kfree(sock4); 1545 } 1546 1547 #if IS_ENABLED(CONFIG_IPV6) 1548 if (__vxlan_sock_release_prep(sock6)) { 1549 udp_tunnel_sock_release(sock6->sock); 1550 kfree(sock6); 1551 } 1552 #endif 1553 } 1554 1555 static enum skb_drop_reason vxlan_remcsum(struct vxlanhdr *unparsed, 1556 struct sk_buff *skb, 1557 u32 vxflags) 1558 { 1559 enum skb_drop_reason reason; 1560 size_t start, offset; 1561 1562 if (!(unparsed->vx_flags & VXLAN_HF_RCO) || skb->remcsum_offload) 1563 goto out; 1564 1565 start = vxlan_rco_start(unparsed->vx_vni); 1566 offset = start + vxlan_rco_offset(unparsed->vx_vni); 1567 1568 reason = pskb_may_pull_reason(skb, offset + sizeof(u16)); 1569 if (reason) 1570 return reason; 1571 1572 skb_remcsum_process(skb, (void *)(vxlan_hdr(skb) + 1), start, offset, 1573 !!(vxflags & VXLAN_F_REMCSUM_NOPARTIAL)); 1574 out: 1575 unparsed->vx_flags &= ~VXLAN_HF_RCO; 1576 unparsed->vx_vni &= VXLAN_VNI_MASK; 1577 1578 return SKB_NOT_DROPPED_YET; 1579 } 1580 1581 static void vxlan_parse_gbp_hdr(struct vxlanhdr *unparsed, 1582 struct sk_buff *skb, u32 vxflags, 1583 struct vxlan_metadata *md) 1584 { 1585 struct vxlanhdr_gbp *gbp = (struct vxlanhdr_gbp *)unparsed; 1586 struct metadata_dst *tun_dst; 1587 1588 if (!(unparsed->vx_flags & VXLAN_HF_GBP)) 1589 goto out; 1590 1591 md->gbp = ntohs(gbp->policy_id); 1592 1593 tun_dst = (struct metadata_dst *)skb_dst(skb); 1594 if (tun_dst) { 1595 __set_bit(IP_TUNNEL_VXLAN_OPT_BIT, 1596 tun_dst->u.tun_info.key.tun_flags); 1597 tun_dst->u.tun_info.options_len = sizeof(*md); 1598 } 1599 if (gbp->dont_learn) 1600 md->gbp |= VXLAN_GBP_DONT_LEARN; 1601 1602 if (gbp->policy_applied) 1603 md->gbp |= VXLAN_GBP_POLICY_APPLIED; 1604 1605 /* In flow-based mode, GBP is carried in dst_metadata */ 1606 if (!(vxflags & VXLAN_F_COLLECT_METADATA)) 1607 skb->mark = md->gbp; 1608 out: 1609 unparsed->vx_flags &= ~VXLAN_GBP_USED_BITS; 1610 } 1611 1612 static enum skb_drop_reason vxlan_set_mac(struct vxlan_dev *vxlan, 1613 struct vxlan_sock *vs, 1614 struct sk_buff *skb, __be32 vni) 1615 { 1616 union vxlan_addr saddr; 1617 u32 ifindex = skb->dev->ifindex; 1618 1619 skb_reset_mac_header(skb); 1620 skb->protocol = eth_type_trans(skb, vxlan->dev); 1621 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); 1622 1623 /* Ignore packet loops (and multicast echo) */ 1624 if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr)) 1625 return SKB_DROP_REASON_LOCAL_MAC; 1626 1627 /* Get address from the outer IP header */ 1628 if (vxlan_get_sk_family(vs) == AF_INET) { 1629 saddr.sin.sin_addr.s_addr = ip_hdr(skb)->saddr; 1630 saddr.sa.sa_family = AF_INET; 1631 #if IS_ENABLED(CONFIG_IPV6) 1632 } else { 1633 saddr.sin6.sin6_addr = ipv6_hdr(skb)->saddr; 1634 saddr.sa.sa_family = AF_INET6; 1635 #endif 1636 } 1637 1638 if (!(vxlan->cfg.flags & VXLAN_F_LEARN)) 1639 return SKB_NOT_DROPPED_YET; 1640 1641 return vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source, 1642 ifindex, vni); 1643 } 1644 1645 static bool vxlan_ecn_decapsulate(struct vxlan_sock *vs, void *oiph, 1646 struct sk_buff *skb) 1647 { 1648 int err = 0; 1649 1650 if (vxlan_get_sk_family(vs) == AF_INET) 1651 err = IP_ECN_decapsulate(oiph, skb); 1652 #if IS_ENABLED(CONFIG_IPV6) 1653 else 1654 err = IP6_ECN_decapsulate(oiph, skb); 1655 #endif 1656 1657 if (unlikely(err) && log_ecn_error) { 1658 if (vxlan_get_sk_family(vs) == AF_INET) 1659 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n", 1660 &((struct iphdr *)oiph)->saddr, 1661 ((struct iphdr *)oiph)->tos); 1662 else 1663 net_info_ratelimited("non-ECT from %pI6\n", 1664 &((struct ipv6hdr *)oiph)->saddr); 1665 } 1666 return err <= 1; 1667 } 1668 1669 /* Callback from net/ipv4/udp.c to receive packets */ 1670 static int vxlan_rcv(struct sock *sk, struct sk_buff *skb) 1671 { 1672 struct vxlan_vni_node *vninode = NULL; 1673 struct vxlan_dev *vxlan; 1674 struct vxlan_sock *vs; 1675 struct vxlanhdr unparsed; 1676 struct vxlan_metadata _md; 1677 struct vxlan_metadata *md = &_md; 1678 __be16 protocol = htons(ETH_P_TEB); 1679 enum skb_drop_reason reason; 1680 bool raw_proto = false; 1681 void *oiph; 1682 __be32 vni = 0; 1683 int nh; 1684 1685 /* Need UDP and VXLAN header to be present */ 1686 reason = pskb_may_pull_reason(skb, VXLAN_HLEN); 1687 if (reason) 1688 goto drop; 1689 1690 unparsed = *vxlan_hdr(skb); 1691 /* VNI flag always required to be set */ 1692 if (!(unparsed.vx_flags & VXLAN_HF_VNI)) { 1693 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n", 1694 ntohl(vxlan_hdr(skb)->vx_flags), 1695 ntohl(vxlan_hdr(skb)->vx_vni)); 1696 reason = SKB_DROP_REASON_VXLAN_INVALID_HDR; 1697 /* Return non vxlan pkt */ 1698 goto drop; 1699 } 1700 unparsed.vx_flags &= ~VXLAN_HF_VNI; 1701 unparsed.vx_vni &= ~VXLAN_VNI_MASK; 1702 1703 vs = rcu_dereference_sk_user_data(sk); 1704 if (!vs) 1705 goto drop; 1706 1707 vni = vxlan_vni(vxlan_hdr(skb)->vx_vni); 1708 1709 vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni, &vninode); 1710 if (!vxlan) { 1711 reason = SKB_DROP_REASON_VXLAN_VNI_NOT_FOUND; 1712 goto drop; 1713 } 1714 1715 /* For backwards compatibility, only allow reserved fields to be 1716 * used by VXLAN extensions if explicitly requested. 1717 */ 1718 if (vs->flags & VXLAN_F_GPE) { 1719 if (!vxlan_parse_gpe_proto(&unparsed, &protocol)) 1720 goto drop; 1721 unparsed.vx_flags &= ~VXLAN_GPE_USED_BITS; 1722 raw_proto = true; 1723 } 1724 1725 if (__iptunnel_pull_header(skb, VXLAN_HLEN, protocol, raw_proto, 1726 !net_eq(vxlan->net, dev_net(vxlan->dev)))) { 1727 reason = SKB_DROP_REASON_NOMEM; 1728 goto drop; 1729 } 1730 1731 if (vs->flags & VXLAN_F_REMCSUM_RX) { 1732 reason = vxlan_remcsum(&unparsed, skb, vs->flags); 1733 if (unlikely(reason)) 1734 goto drop; 1735 } 1736 1737 if (vxlan_collect_metadata(vs)) { 1738 IP_TUNNEL_DECLARE_FLAGS(flags) = { }; 1739 struct metadata_dst *tun_dst; 1740 1741 __set_bit(IP_TUNNEL_KEY_BIT, flags); 1742 tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), flags, 1743 key32_to_tunnel_id(vni), sizeof(*md)); 1744 1745 if (!tun_dst) { 1746 reason = SKB_DROP_REASON_NOMEM; 1747 goto drop; 1748 } 1749 1750 md = ip_tunnel_info_opts(&tun_dst->u.tun_info); 1751 1752 skb_dst_set(skb, (struct dst_entry *)tun_dst); 1753 } else { 1754 memset(md, 0, sizeof(*md)); 1755 } 1756 1757 if (vs->flags & VXLAN_F_GBP) 1758 vxlan_parse_gbp_hdr(&unparsed, skb, vs->flags, md); 1759 /* Note that GBP and GPE can never be active together. This is 1760 * ensured in vxlan_dev_configure. 1761 */ 1762 1763 if (unparsed.vx_flags || unparsed.vx_vni) { 1764 /* If there are any unprocessed flags remaining treat 1765 * this as a malformed packet. This behavior diverges from 1766 * VXLAN RFC (RFC7348) which stipulates that bits in reserved 1767 * in reserved fields are to be ignored. The approach here 1768 * maintains compatibility with previous stack code, and also 1769 * is more robust and provides a little more security in 1770 * adding extensions to VXLAN. 1771 */ 1772 reason = SKB_DROP_REASON_VXLAN_INVALID_HDR; 1773 goto drop; 1774 } 1775 1776 if (!raw_proto) { 1777 reason = vxlan_set_mac(vxlan, vs, skb, vni); 1778 if (reason) 1779 goto drop; 1780 } else { 1781 skb_reset_mac_header(skb); 1782 skb->dev = vxlan->dev; 1783 skb->pkt_type = PACKET_HOST; 1784 } 1785 1786 /* Save offset of outer header relative to skb->head, 1787 * because we are going to reset the network header to the inner header 1788 * and might change skb->head. 1789 */ 1790 nh = skb_network_header(skb) - skb->head; 1791 1792 skb_reset_network_header(skb); 1793 1794 reason = pskb_inet_may_pull_reason(skb); 1795 if (reason) { 1796 DEV_STATS_INC(vxlan->dev, rx_length_errors); 1797 DEV_STATS_INC(vxlan->dev, rx_errors); 1798 vxlan_vnifilter_count(vxlan, vni, vninode, 1799 VXLAN_VNI_STATS_RX_ERRORS, 0); 1800 goto drop; 1801 } 1802 1803 /* Get the outer header. */ 1804 oiph = skb->head + nh; 1805 1806 if (!vxlan_ecn_decapsulate(vs, oiph, skb)) { 1807 reason = SKB_DROP_REASON_IP_TUNNEL_ECN; 1808 DEV_STATS_INC(vxlan->dev, rx_frame_errors); 1809 DEV_STATS_INC(vxlan->dev, rx_errors); 1810 vxlan_vnifilter_count(vxlan, vni, vninode, 1811 VXLAN_VNI_STATS_RX_ERRORS, 0); 1812 goto drop; 1813 } 1814 1815 rcu_read_lock(); 1816 1817 if (unlikely(!(vxlan->dev->flags & IFF_UP))) { 1818 rcu_read_unlock(); 1819 dev_core_stats_rx_dropped_inc(vxlan->dev); 1820 vxlan_vnifilter_count(vxlan, vni, vninode, 1821 VXLAN_VNI_STATS_RX_DROPS, 0); 1822 reason = SKB_DROP_REASON_DEV_READY; 1823 goto drop; 1824 } 1825 1826 dev_sw_netstats_rx_add(vxlan->dev, skb->len); 1827 vxlan_vnifilter_count(vxlan, vni, vninode, VXLAN_VNI_STATS_RX, skb->len); 1828 gro_cells_receive(&vxlan->gro_cells, skb); 1829 1830 rcu_read_unlock(); 1831 1832 return 0; 1833 1834 drop: 1835 reason = reason ?: SKB_DROP_REASON_NOT_SPECIFIED; 1836 /* Consume bad packet */ 1837 kfree_skb_reason(skb, reason); 1838 return 0; 1839 } 1840 1841 /* Callback from net/ipv{4,6}/udp.c to check that we have a VNI for errors */ 1842 static int vxlan_err_lookup(struct sock *sk, struct sk_buff *skb) 1843 { 1844 struct vxlan_dev *vxlan; 1845 struct vxlan_sock *vs; 1846 struct vxlanhdr *hdr; 1847 __be32 vni; 1848 1849 if (!pskb_may_pull(skb, skb_transport_offset(skb) + VXLAN_HLEN)) 1850 return -EINVAL; 1851 1852 hdr = vxlan_hdr(skb); 1853 1854 if (!(hdr->vx_flags & VXLAN_HF_VNI)) 1855 return -EINVAL; 1856 1857 vs = rcu_dereference_sk_user_data(sk); 1858 if (!vs) 1859 return -ENOENT; 1860 1861 vni = vxlan_vni(hdr->vx_vni); 1862 vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni, NULL); 1863 if (!vxlan) 1864 return -ENOENT; 1865 1866 return 0; 1867 } 1868 1869 static int arp_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni) 1870 { 1871 struct vxlan_dev *vxlan = netdev_priv(dev); 1872 struct arphdr *parp; 1873 u8 *arpptr, *sha; 1874 __be32 sip, tip; 1875 struct neighbour *n; 1876 1877 if (dev->flags & IFF_NOARP) 1878 goto out; 1879 1880 if (!pskb_may_pull(skb, arp_hdr_len(dev))) { 1881 dev_core_stats_tx_dropped_inc(dev); 1882 vxlan_vnifilter_count(vxlan, vni, NULL, 1883 VXLAN_VNI_STATS_TX_DROPS, 0); 1884 goto out; 1885 } 1886 parp = arp_hdr(skb); 1887 1888 if ((parp->ar_hrd != htons(ARPHRD_ETHER) && 1889 parp->ar_hrd != htons(ARPHRD_IEEE802)) || 1890 parp->ar_pro != htons(ETH_P_IP) || 1891 parp->ar_op != htons(ARPOP_REQUEST) || 1892 parp->ar_hln != dev->addr_len || 1893 parp->ar_pln != 4) 1894 goto out; 1895 arpptr = (u8 *)parp + sizeof(struct arphdr); 1896 sha = arpptr; 1897 arpptr += dev->addr_len; /* sha */ 1898 memcpy(&sip, arpptr, sizeof(sip)); 1899 arpptr += sizeof(sip); 1900 arpptr += dev->addr_len; /* tha */ 1901 memcpy(&tip, arpptr, sizeof(tip)); 1902 1903 if (ipv4_is_loopback(tip) || 1904 ipv4_is_multicast(tip)) 1905 goto out; 1906 1907 n = neigh_lookup(&arp_tbl, &tip, dev); 1908 1909 if (n) { 1910 struct vxlan_fdb *f; 1911 struct sk_buff *reply; 1912 1913 if (!(READ_ONCE(n->nud_state) & NUD_CONNECTED)) { 1914 neigh_release(n); 1915 goto out; 1916 } 1917 1918 f = vxlan_find_mac(vxlan, n->ha, vni); 1919 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) { 1920 /* bridge-local neighbor */ 1921 neigh_release(n); 1922 goto out; 1923 } 1924 1925 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha, 1926 n->ha, sha); 1927 1928 neigh_release(n); 1929 1930 if (reply == NULL) 1931 goto out; 1932 1933 skb_reset_mac_header(reply); 1934 __skb_pull(reply, skb_network_offset(reply)); 1935 reply->ip_summed = CHECKSUM_UNNECESSARY; 1936 reply->pkt_type = PACKET_HOST; 1937 1938 if (netif_rx(reply) == NET_RX_DROP) { 1939 dev_core_stats_rx_dropped_inc(dev); 1940 vxlan_vnifilter_count(vxlan, vni, NULL, 1941 VXLAN_VNI_STATS_RX_DROPS, 0); 1942 } 1943 1944 } else if (vxlan->cfg.flags & VXLAN_F_L3MISS) { 1945 union vxlan_addr ipa = { 1946 .sin.sin_addr.s_addr = tip, 1947 .sin.sin_family = AF_INET, 1948 }; 1949 1950 vxlan_ip_miss(dev, &ipa); 1951 } 1952 out: 1953 consume_skb(skb); 1954 return NETDEV_TX_OK; 1955 } 1956 1957 #if IS_ENABLED(CONFIG_IPV6) 1958 static struct sk_buff *vxlan_na_create(struct sk_buff *request, 1959 struct neighbour *n, bool isrouter) 1960 { 1961 struct net_device *dev = request->dev; 1962 struct sk_buff *reply; 1963 struct nd_msg *ns, *na; 1964 struct ipv6hdr *pip6; 1965 u8 *daddr; 1966 int na_olen = 8; /* opt hdr + ETH_ALEN for target */ 1967 int ns_olen; 1968 int i, len; 1969 1970 if (dev == NULL || !pskb_may_pull(request, request->len)) 1971 return NULL; 1972 1973 len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) + 1974 sizeof(*na) + na_olen + dev->needed_tailroom; 1975 reply = alloc_skb(len, GFP_ATOMIC); 1976 if (reply == NULL) 1977 return NULL; 1978 1979 reply->protocol = htons(ETH_P_IPV6); 1980 reply->dev = dev; 1981 skb_reserve(reply, LL_RESERVED_SPACE(request->dev)); 1982 skb_push(reply, sizeof(struct ethhdr)); 1983 skb_reset_mac_header(reply); 1984 1985 ns = (struct nd_msg *)(ipv6_hdr(request) + 1); 1986 1987 daddr = eth_hdr(request)->h_source; 1988 ns_olen = request->len - skb_network_offset(request) - 1989 sizeof(struct ipv6hdr) - sizeof(*ns); 1990 for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) { 1991 if (!ns->opt[i + 1]) { 1992 kfree_skb(reply); 1993 return NULL; 1994 } 1995 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) { 1996 daddr = ns->opt + i + sizeof(struct nd_opt_hdr); 1997 break; 1998 } 1999 } 2000 2001 /* Ethernet header */ 2002 ether_addr_copy(eth_hdr(reply)->h_dest, daddr); 2003 ether_addr_copy(eth_hdr(reply)->h_source, n->ha); 2004 eth_hdr(reply)->h_proto = htons(ETH_P_IPV6); 2005 reply->protocol = htons(ETH_P_IPV6); 2006 2007 skb_pull(reply, sizeof(struct ethhdr)); 2008 skb_reset_network_header(reply); 2009 skb_put(reply, sizeof(struct ipv6hdr)); 2010 2011 /* IPv6 header */ 2012 2013 pip6 = ipv6_hdr(reply); 2014 memset(pip6, 0, sizeof(struct ipv6hdr)); 2015 pip6->version = 6; 2016 pip6->priority = ipv6_hdr(request)->priority; 2017 pip6->nexthdr = IPPROTO_ICMPV6; 2018 pip6->hop_limit = 255; 2019 pip6->daddr = ipv6_hdr(request)->saddr; 2020 pip6->saddr = *(struct in6_addr *)n->primary_key; 2021 2022 skb_pull(reply, sizeof(struct ipv6hdr)); 2023 skb_reset_transport_header(reply); 2024 2025 /* Neighbor Advertisement */ 2026 na = skb_put_zero(reply, sizeof(*na) + na_olen); 2027 na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT; 2028 na->icmph.icmp6_router = isrouter; 2029 na->icmph.icmp6_override = 1; 2030 na->icmph.icmp6_solicited = 1; 2031 na->target = ns->target; 2032 ether_addr_copy(&na->opt[2], n->ha); 2033 na->opt[0] = ND_OPT_TARGET_LL_ADDR; 2034 na->opt[1] = na_olen >> 3; 2035 2036 na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr, 2037 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6, 2038 csum_partial(na, sizeof(*na)+na_olen, 0)); 2039 2040 pip6->payload_len = htons(sizeof(*na)+na_olen); 2041 2042 skb_push(reply, sizeof(struct ipv6hdr)); 2043 2044 reply->ip_summed = CHECKSUM_UNNECESSARY; 2045 2046 return reply; 2047 } 2048 2049 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni) 2050 { 2051 struct vxlan_dev *vxlan = netdev_priv(dev); 2052 const struct in6_addr *daddr; 2053 const struct ipv6hdr *iphdr; 2054 struct inet6_dev *in6_dev; 2055 struct neighbour *n; 2056 struct nd_msg *msg; 2057 2058 rcu_read_lock(); 2059 in6_dev = __in6_dev_get(dev); 2060 if (!in6_dev) 2061 goto out; 2062 2063 iphdr = ipv6_hdr(skb); 2064 daddr = &iphdr->daddr; 2065 msg = (struct nd_msg *)(iphdr + 1); 2066 2067 if (ipv6_addr_loopback(daddr) || 2068 ipv6_addr_is_multicast(&msg->target)) 2069 goto out; 2070 2071 n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev); 2072 2073 if (n) { 2074 struct vxlan_fdb *f; 2075 struct sk_buff *reply; 2076 2077 if (!(READ_ONCE(n->nud_state) & NUD_CONNECTED)) { 2078 neigh_release(n); 2079 goto out; 2080 } 2081 2082 f = vxlan_find_mac(vxlan, n->ha, vni); 2083 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) { 2084 /* bridge-local neighbor */ 2085 neigh_release(n); 2086 goto out; 2087 } 2088 2089 reply = vxlan_na_create(skb, n, 2090 !!(f ? f->flags & NTF_ROUTER : 0)); 2091 2092 neigh_release(n); 2093 2094 if (reply == NULL) 2095 goto out; 2096 2097 if (netif_rx(reply) == NET_RX_DROP) { 2098 dev_core_stats_rx_dropped_inc(dev); 2099 vxlan_vnifilter_count(vxlan, vni, NULL, 2100 VXLAN_VNI_STATS_RX_DROPS, 0); 2101 } 2102 } else if (vxlan->cfg.flags & VXLAN_F_L3MISS) { 2103 union vxlan_addr ipa = { 2104 .sin6.sin6_addr = msg->target, 2105 .sin6.sin6_family = AF_INET6, 2106 }; 2107 2108 vxlan_ip_miss(dev, &ipa); 2109 } 2110 2111 out: 2112 rcu_read_unlock(); 2113 consume_skb(skb); 2114 return NETDEV_TX_OK; 2115 } 2116 #endif 2117 2118 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb) 2119 { 2120 struct vxlan_dev *vxlan = netdev_priv(dev); 2121 struct neighbour *n; 2122 2123 if (is_multicast_ether_addr(eth_hdr(skb)->h_dest)) 2124 return false; 2125 2126 n = NULL; 2127 switch (ntohs(eth_hdr(skb)->h_proto)) { 2128 case ETH_P_IP: 2129 { 2130 struct iphdr *pip; 2131 2132 if (!pskb_may_pull(skb, sizeof(struct iphdr))) 2133 return false; 2134 pip = ip_hdr(skb); 2135 n = neigh_lookup(&arp_tbl, &pip->daddr, dev); 2136 if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) { 2137 union vxlan_addr ipa = { 2138 .sin.sin_addr.s_addr = pip->daddr, 2139 .sin.sin_family = AF_INET, 2140 }; 2141 2142 vxlan_ip_miss(dev, &ipa); 2143 return false; 2144 } 2145 2146 break; 2147 } 2148 #if IS_ENABLED(CONFIG_IPV6) 2149 case ETH_P_IPV6: 2150 { 2151 struct ipv6hdr *pip6; 2152 2153 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 2154 return false; 2155 pip6 = ipv6_hdr(skb); 2156 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev); 2157 if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) { 2158 union vxlan_addr ipa = { 2159 .sin6.sin6_addr = pip6->daddr, 2160 .sin6.sin6_family = AF_INET6, 2161 }; 2162 2163 vxlan_ip_miss(dev, &ipa); 2164 return false; 2165 } 2166 2167 break; 2168 } 2169 #endif 2170 default: 2171 return false; 2172 } 2173 2174 if (n) { 2175 bool diff; 2176 2177 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha); 2178 if (diff) { 2179 memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest, 2180 dev->addr_len); 2181 memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len); 2182 } 2183 neigh_release(n); 2184 return diff; 2185 } 2186 2187 return false; 2188 } 2189 2190 static int vxlan_build_gpe_hdr(struct vxlanhdr *vxh, __be16 protocol) 2191 { 2192 struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)vxh; 2193 2194 gpe->np_applied = 1; 2195 gpe->next_protocol = tun_p_from_eth_p(protocol); 2196 if (!gpe->next_protocol) 2197 return -EPFNOSUPPORT; 2198 return 0; 2199 } 2200 2201 static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst, 2202 int iphdr_len, __be32 vni, 2203 struct vxlan_metadata *md, u32 vxflags, 2204 bool udp_sum) 2205 { 2206 struct vxlanhdr *vxh; 2207 int min_headroom; 2208 int err; 2209 int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL; 2210 __be16 inner_protocol = htons(ETH_P_TEB); 2211 2212 if ((vxflags & VXLAN_F_REMCSUM_TX) && 2213 skb->ip_summed == CHECKSUM_PARTIAL) { 2214 int csum_start = skb_checksum_start_offset(skb); 2215 2216 if (csum_start <= VXLAN_MAX_REMCSUM_START && 2217 !(csum_start & VXLAN_RCO_SHIFT_MASK) && 2218 (skb->csum_offset == offsetof(struct udphdr, check) || 2219 skb->csum_offset == offsetof(struct tcphdr, check))) 2220 type |= SKB_GSO_TUNNEL_REMCSUM; 2221 } 2222 2223 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len 2224 + VXLAN_HLEN + iphdr_len; 2225 2226 /* Need space for new headers (invalidates iph ptr) */ 2227 err = skb_cow_head(skb, min_headroom); 2228 if (unlikely(err)) 2229 return err; 2230 2231 err = iptunnel_handle_offloads(skb, type); 2232 if (err) 2233 return err; 2234 2235 vxh = __skb_push(skb, sizeof(*vxh)); 2236 vxh->vx_flags = VXLAN_HF_VNI; 2237 vxh->vx_vni = vxlan_vni_field(vni); 2238 2239 if (type & SKB_GSO_TUNNEL_REMCSUM) { 2240 unsigned int start; 2241 2242 start = skb_checksum_start_offset(skb) - sizeof(struct vxlanhdr); 2243 vxh->vx_vni |= vxlan_compute_rco(start, skb->csum_offset); 2244 vxh->vx_flags |= VXLAN_HF_RCO; 2245 2246 if (!skb_is_gso(skb)) { 2247 skb->ip_summed = CHECKSUM_NONE; 2248 skb->encapsulation = 0; 2249 } 2250 } 2251 2252 if (vxflags & VXLAN_F_GBP) 2253 vxlan_build_gbp_hdr(vxh, md); 2254 if (vxflags & VXLAN_F_GPE) { 2255 err = vxlan_build_gpe_hdr(vxh, skb->protocol); 2256 if (err < 0) 2257 return err; 2258 inner_protocol = skb->protocol; 2259 } 2260 2261 skb_set_inner_protocol(skb, inner_protocol); 2262 return 0; 2263 } 2264 2265 /* Bypass encapsulation if the destination is local */ 2266 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan, 2267 struct vxlan_dev *dst_vxlan, __be32 vni, 2268 bool snoop) 2269 { 2270 union vxlan_addr loopback; 2271 union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip; 2272 struct net_device *dev; 2273 int len = skb->len; 2274 2275 skb->pkt_type = PACKET_HOST; 2276 skb->encapsulation = 0; 2277 skb->dev = dst_vxlan->dev; 2278 __skb_pull(skb, skb_network_offset(skb)); 2279 2280 if (remote_ip->sa.sa_family == AF_INET) { 2281 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK); 2282 loopback.sa.sa_family = AF_INET; 2283 #if IS_ENABLED(CONFIG_IPV6) 2284 } else { 2285 loopback.sin6.sin6_addr = in6addr_loopback; 2286 loopback.sa.sa_family = AF_INET6; 2287 #endif 2288 } 2289 2290 rcu_read_lock(); 2291 dev = skb->dev; 2292 if (unlikely(!(dev->flags & IFF_UP))) { 2293 kfree_skb(skb); 2294 goto drop; 2295 } 2296 2297 if ((dst_vxlan->cfg.flags & VXLAN_F_LEARN) && snoop) 2298 vxlan_snoop(dev, &loopback, eth_hdr(skb)->h_source, 0, vni); 2299 2300 dev_sw_netstats_tx_add(src_vxlan->dev, 1, len); 2301 vxlan_vnifilter_count(src_vxlan, vni, NULL, VXLAN_VNI_STATS_TX, len); 2302 2303 if (__netif_rx(skb) == NET_RX_SUCCESS) { 2304 dev_sw_netstats_rx_add(dst_vxlan->dev, len); 2305 vxlan_vnifilter_count(dst_vxlan, vni, NULL, VXLAN_VNI_STATS_RX, 2306 len); 2307 } else { 2308 drop: 2309 dev_core_stats_rx_dropped_inc(dev); 2310 vxlan_vnifilter_count(dst_vxlan, vni, NULL, 2311 VXLAN_VNI_STATS_RX_DROPS, 0); 2312 } 2313 rcu_read_unlock(); 2314 } 2315 2316 static int encap_bypass_if_local(struct sk_buff *skb, struct net_device *dev, 2317 struct vxlan_dev *vxlan, 2318 int addr_family, 2319 __be16 dst_port, int dst_ifindex, __be32 vni, 2320 struct dst_entry *dst, 2321 u32 rt_flags) 2322 { 2323 #if IS_ENABLED(CONFIG_IPV6) 2324 /* IPv6 rt-flags are checked against RTF_LOCAL, but the value of 2325 * RTF_LOCAL is equal to RTCF_LOCAL. So to keep code simple 2326 * we can use RTCF_LOCAL which works for ipv4 and ipv6 route entry. 2327 */ 2328 BUILD_BUG_ON(RTCF_LOCAL != RTF_LOCAL); 2329 #endif 2330 /* Bypass encapsulation if the destination is local */ 2331 if (rt_flags & RTCF_LOCAL && 2332 !(rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST)) && 2333 vxlan->cfg.flags & VXLAN_F_LOCALBYPASS) { 2334 struct vxlan_dev *dst_vxlan; 2335 2336 dst_release(dst); 2337 dst_vxlan = vxlan_find_vni(vxlan->net, dst_ifindex, vni, 2338 addr_family, dst_port, 2339 vxlan->cfg.flags); 2340 if (!dst_vxlan) { 2341 DEV_STATS_INC(dev, tx_errors); 2342 vxlan_vnifilter_count(vxlan, vni, NULL, 2343 VXLAN_VNI_STATS_TX_ERRORS, 0); 2344 kfree_skb(skb); 2345 2346 return -ENOENT; 2347 } 2348 vxlan_encap_bypass(skb, vxlan, dst_vxlan, vni, true); 2349 return 1; 2350 } 2351 2352 return 0; 2353 } 2354 2355 void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev, 2356 __be32 default_vni, struct vxlan_rdst *rdst, bool did_rsc) 2357 { 2358 struct dst_cache *dst_cache; 2359 struct ip_tunnel_info *info; 2360 struct ip_tunnel_key *pkey; 2361 struct ip_tunnel_key key; 2362 struct vxlan_dev *vxlan = netdev_priv(dev); 2363 const struct iphdr *old_iph; 2364 struct vxlan_metadata _md; 2365 struct vxlan_metadata *md = &_md; 2366 unsigned int pkt_len = skb->len; 2367 __be16 src_port = 0, dst_port; 2368 struct dst_entry *ndst = NULL; 2369 int addr_family; 2370 __u8 tos, ttl; 2371 int ifindex; 2372 int err; 2373 u32 flags = vxlan->cfg.flags; 2374 bool use_cache; 2375 bool udp_sum = false; 2376 bool xnet = !net_eq(vxlan->net, dev_net(vxlan->dev)); 2377 bool no_eth_encap; 2378 __be32 vni = 0; 2379 2380 no_eth_encap = flags & VXLAN_F_GPE && skb->protocol != htons(ETH_P_TEB); 2381 if (skb_vlan_inet_prepare(skb, no_eth_encap)) 2382 goto drop; 2383 2384 old_iph = ip_hdr(skb); 2385 2386 info = skb_tunnel_info(skb); 2387 use_cache = ip_tunnel_dst_cache_usable(skb, info); 2388 2389 if (rdst) { 2390 memset(&key, 0, sizeof(key)); 2391 pkey = &key; 2392 2393 if (vxlan_addr_any(&rdst->remote_ip)) { 2394 if (did_rsc) { 2395 /* short-circuited back to local bridge */ 2396 vxlan_encap_bypass(skb, vxlan, vxlan, 2397 default_vni, true); 2398 return; 2399 } 2400 goto drop; 2401 } 2402 2403 addr_family = vxlan->cfg.saddr.sa.sa_family; 2404 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port; 2405 vni = (rdst->remote_vni) ? : default_vni; 2406 ifindex = rdst->remote_ifindex; 2407 2408 if (addr_family == AF_INET) { 2409 key.u.ipv4.src = vxlan->cfg.saddr.sin.sin_addr.s_addr; 2410 key.u.ipv4.dst = rdst->remote_ip.sin.sin_addr.s_addr; 2411 } else { 2412 key.u.ipv6.src = vxlan->cfg.saddr.sin6.sin6_addr; 2413 key.u.ipv6.dst = rdst->remote_ip.sin6.sin6_addr; 2414 } 2415 2416 dst_cache = &rdst->dst_cache; 2417 md->gbp = skb->mark; 2418 if (flags & VXLAN_F_TTL_INHERIT) { 2419 ttl = ip_tunnel_get_ttl(old_iph, skb); 2420 } else { 2421 ttl = vxlan->cfg.ttl; 2422 if (!ttl && vxlan_addr_multicast(&rdst->remote_ip)) 2423 ttl = 1; 2424 } 2425 tos = vxlan->cfg.tos; 2426 if (tos == 1) 2427 tos = ip_tunnel_get_dsfield(old_iph, skb); 2428 if (tos && !info) 2429 use_cache = false; 2430 2431 if (addr_family == AF_INET) 2432 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM_TX); 2433 else 2434 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX); 2435 #if IS_ENABLED(CONFIG_IPV6) 2436 switch (vxlan->cfg.label_policy) { 2437 case VXLAN_LABEL_FIXED: 2438 key.label = vxlan->cfg.label; 2439 break; 2440 case VXLAN_LABEL_INHERIT: 2441 key.label = ip_tunnel_get_flowlabel(old_iph, skb); 2442 break; 2443 default: 2444 DEBUG_NET_WARN_ON_ONCE(1); 2445 goto drop; 2446 } 2447 #endif 2448 } else { 2449 if (!info) { 2450 WARN_ONCE(1, "%s: Missing encapsulation instructions\n", 2451 dev->name); 2452 goto drop; 2453 } 2454 pkey = &info->key; 2455 addr_family = ip_tunnel_info_af(info); 2456 dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port; 2457 vni = tunnel_id_to_key32(info->key.tun_id); 2458 ifindex = 0; 2459 dst_cache = &info->dst_cache; 2460 if (test_bit(IP_TUNNEL_VXLAN_OPT_BIT, info->key.tun_flags)) { 2461 if (info->options_len < sizeof(*md)) 2462 goto drop; 2463 md = ip_tunnel_info_opts(info); 2464 } 2465 ttl = info->key.ttl; 2466 tos = info->key.tos; 2467 udp_sum = test_bit(IP_TUNNEL_CSUM_BIT, info->key.tun_flags); 2468 } 2469 src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min, 2470 vxlan->cfg.port_max, true); 2471 2472 rcu_read_lock(); 2473 if (addr_family == AF_INET) { 2474 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock); 2475 struct rtable *rt; 2476 __be16 df = 0; 2477 __be32 saddr; 2478 2479 if (!ifindex) 2480 ifindex = sock4->sock->sk->sk_bound_dev_if; 2481 2482 rt = udp_tunnel_dst_lookup(skb, dev, vxlan->net, ifindex, 2483 &saddr, pkey, src_port, dst_port, 2484 tos, use_cache ? dst_cache : NULL); 2485 if (IS_ERR(rt)) { 2486 err = PTR_ERR(rt); 2487 goto tx_error; 2488 } 2489 2490 if (!info) { 2491 /* Bypass encapsulation if the destination is local */ 2492 err = encap_bypass_if_local(skb, dev, vxlan, AF_INET, 2493 dst_port, ifindex, vni, 2494 &rt->dst, rt->rt_flags); 2495 if (err) 2496 goto out_unlock; 2497 2498 if (vxlan->cfg.df == VXLAN_DF_SET) { 2499 df = htons(IP_DF); 2500 } else if (vxlan->cfg.df == VXLAN_DF_INHERIT) { 2501 struct ethhdr *eth = eth_hdr(skb); 2502 2503 if (ntohs(eth->h_proto) == ETH_P_IPV6 || 2504 (ntohs(eth->h_proto) == ETH_P_IP && 2505 old_iph->frag_off & htons(IP_DF))) 2506 df = htons(IP_DF); 2507 } 2508 } else if (test_bit(IP_TUNNEL_DONT_FRAGMENT_BIT, 2509 info->key.tun_flags)) { 2510 df = htons(IP_DF); 2511 } 2512 2513 ndst = &rt->dst; 2514 err = skb_tunnel_check_pmtu(skb, ndst, vxlan_headroom(flags & VXLAN_F_GPE), 2515 netif_is_any_bridge_port(dev)); 2516 if (err < 0) { 2517 goto tx_error; 2518 } else if (err) { 2519 if (info) { 2520 struct ip_tunnel_info *unclone; 2521 2522 unclone = skb_tunnel_info_unclone(skb); 2523 if (unlikely(!unclone)) 2524 goto tx_error; 2525 2526 unclone->key.u.ipv4.src = pkey->u.ipv4.dst; 2527 unclone->key.u.ipv4.dst = saddr; 2528 } 2529 vxlan_encap_bypass(skb, vxlan, vxlan, vni, false); 2530 dst_release(ndst); 2531 goto out_unlock; 2532 } 2533 2534 tos = ip_tunnel_ecn_encap(tos, old_iph, skb); 2535 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst); 2536 err = vxlan_build_skb(skb, ndst, sizeof(struct iphdr), 2537 vni, md, flags, udp_sum); 2538 if (err < 0) 2539 goto tx_error; 2540 2541 udp_tunnel_xmit_skb(rt, sock4->sock->sk, skb, saddr, 2542 pkey->u.ipv4.dst, tos, ttl, df, 2543 src_port, dst_port, xnet, !udp_sum); 2544 #if IS_ENABLED(CONFIG_IPV6) 2545 } else { 2546 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock); 2547 struct in6_addr saddr; 2548 2549 if (!ifindex) 2550 ifindex = sock6->sock->sk->sk_bound_dev_if; 2551 2552 ndst = udp_tunnel6_dst_lookup(skb, dev, vxlan->net, sock6->sock, 2553 ifindex, &saddr, pkey, 2554 src_port, dst_port, tos, 2555 use_cache ? dst_cache : NULL); 2556 if (IS_ERR(ndst)) { 2557 err = PTR_ERR(ndst); 2558 ndst = NULL; 2559 goto tx_error; 2560 } 2561 2562 if (!info) { 2563 u32 rt6i_flags = dst_rt6_info(ndst)->rt6i_flags; 2564 2565 err = encap_bypass_if_local(skb, dev, vxlan, AF_INET6, 2566 dst_port, ifindex, vni, 2567 ndst, rt6i_flags); 2568 if (err) 2569 goto out_unlock; 2570 } 2571 2572 err = skb_tunnel_check_pmtu(skb, ndst, 2573 vxlan_headroom((flags & VXLAN_F_GPE) | VXLAN_F_IPV6), 2574 netif_is_any_bridge_port(dev)); 2575 if (err < 0) { 2576 goto tx_error; 2577 } else if (err) { 2578 if (info) { 2579 struct ip_tunnel_info *unclone; 2580 2581 unclone = skb_tunnel_info_unclone(skb); 2582 if (unlikely(!unclone)) 2583 goto tx_error; 2584 2585 unclone->key.u.ipv6.src = pkey->u.ipv6.dst; 2586 unclone->key.u.ipv6.dst = saddr; 2587 } 2588 2589 vxlan_encap_bypass(skb, vxlan, vxlan, vni, false); 2590 dst_release(ndst); 2591 goto out_unlock; 2592 } 2593 2594 tos = ip_tunnel_ecn_encap(tos, old_iph, skb); 2595 ttl = ttl ? : ip6_dst_hoplimit(ndst); 2596 skb_scrub_packet(skb, xnet); 2597 err = vxlan_build_skb(skb, ndst, sizeof(struct ipv6hdr), 2598 vni, md, flags, udp_sum); 2599 if (err < 0) 2600 goto tx_error; 2601 2602 udp_tunnel6_xmit_skb(ndst, sock6->sock->sk, skb, dev, 2603 &saddr, &pkey->u.ipv6.dst, tos, ttl, 2604 pkey->label, src_port, dst_port, !udp_sum); 2605 #endif 2606 } 2607 vxlan_vnifilter_count(vxlan, vni, NULL, VXLAN_VNI_STATS_TX, pkt_len); 2608 out_unlock: 2609 rcu_read_unlock(); 2610 return; 2611 2612 drop: 2613 dev_core_stats_tx_dropped_inc(dev); 2614 vxlan_vnifilter_count(vxlan, vni, NULL, VXLAN_VNI_STATS_TX_DROPS, 0); 2615 dev_kfree_skb(skb); 2616 return; 2617 2618 tx_error: 2619 rcu_read_unlock(); 2620 if (err == -ELOOP) 2621 DEV_STATS_INC(dev, collisions); 2622 else if (err == -ENETUNREACH) 2623 DEV_STATS_INC(dev, tx_carrier_errors); 2624 dst_release(ndst); 2625 DEV_STATS_INC(dev, tx_errors); 2626 vxlan_vnifilter_count(vxlan, vni, NULL, VXLAN_VNI_STATS_TX_ERRORS, 0); 2627 kfree_skb(skb); 2628 } 2629 2630 static void vxlan_xmit_nh(struct sk_buff *skb, struct net_device *dev, 2631 struct vxlan_fdb *f, __be32 vni, bool did_rsc) 2632 { 2633 struct vxlan_rdst nh_rdst; 2634 struct nexthop *nh; 2635 bool do_xmit; 2636 u32 hash; 2637 2638 memset(&nh_rdst, 0, sizeof(struct vxlan_rdst)); 2639 hash = skb_get_hash(skb); 2640 2641 rcu_read_lock(); 2642 nh = rcu_dereference(f->nh); 2643 if (!nh) { 2644 rcu_read_unlock(); 2645 goto drop; 2646 } 2647 do_xmit = vxlan_fdb_nh_path_select(nh, hash, &nh_rdst); 2648 rcu_read_unlock(); 2649 2650 if (likely(do_xmit)) 2651 vxlan_xmit_one(skb, dev, vni, &nh_rdst, did_rsc); 2652 else 2653 goto drop; 2654 2655 return; 2656 2657 drop: 2658 dev_core_stats_tx_dropped_inc(dev); 2659 vxlan_vnifilter_count(netdev_priv(dev), vni, NULL, 2660 VXLAN_VNI_STATS_TX_DROPS, 0); 2661 dev_kfree_skb(skb); 2662 } 2663 2664 static netdev_tx_t vxlan_xmit_nhid(struct sk_buff *skb, struct net_device *dev, 2665 u32 nhid, __be32 vni) 2666 { 2667 struct vxlan_dev *vxlan = netdev_priv(dev); 2668 struct vxlan_rdst nh_rdst; 2669 struct nexthop *nh; 2670 bool do_xmit; 2671 u32 hash; 2672 2673 memset(&nh_rdst, 0, sizeof(struct vxlan_rdst)); 2674 hash = skb_get_hash(skb); 2675 2676 rcu_read_lock(); 2677 nh = nexthop_find_by_id(dev_net(dev), nhid); 2678 if (unlikely(!nh || !nexthop_is_fdb(nh) || !nexthop_is_multipath(nh))) { 2679 rcu_read_unlock(); 2680 goto drop; 2681 } 2682 do_xmit = vxlan_fdb_nh_path_select(nh, hash, &nh_rdst); 2683 rcu_read_unlock(); 2684 2685 if (vxlan->cfg.saddr.sa.sa_family != nh_rdst.remote_ip.sa.sa_family) 2686 goto drop; 2687 2688 if (likely(do_xmit)) 2689 vxlan_xmit_one(skb, dev, vni, &nh_rdst, false); 2690 else 2691 goto drop; 2692 2693 return NETDEV_TX_OK; 2694 2695 drop: 2696 dev_core_stats_tx_dropped_inc(dev); 2697 vxlan_vnifilter_count(netdev_priv(dev), vni, NULL, 2698 VXLAN_VNI_STATS_TX_DROPS, 0); 2699 dev_kfree_skb(skb); 2700 return NETDEV_TX_OK; 2701 } 2702 2703 /* Transmit local packets over Vxlan 2704 * 2705 * Outer IP header inherits ECN and DF from inner header. 2706 * Outer UDP destination is the VXLAN assigned port. 2707 * source port is based on hash of flow 2708 */ 2709 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev) 2710 { 2711 struct vxlan_dev *vxlan = netdev_priv(dev); 2712 struct vxlan_rdst *rdst, *fdst = NULL; 2713 const struct ip_tunnel_info *info; 2714 struct vxlan_fdb *f; 2715 struct ethhdr *eth; 2716 __be32 vni = 0; 2717 u32 nhid = 0; 2718 bool did_rsc; 2719 2720 info = skb_tunnel_info(skb); 2721 2722 skb_reset_mac_header(skb); 2723 2724 if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) { 2725 if (info && info->mode & IP_TUNNEL_INFO_BRIDGE && 2726 info->mode & IP_TUNNEL_INFO_TX) { 2727 vni = tunnel_id_to_key32(info->key.tun_id); 2728 nhid = info->key.nhid; 2729 } else { 2730 if (info && info->mode & IP_TUNNEL_INFO_TX) 2731 vxlan_xmit_one(skb, dev, vni, NULL, false); 2732 else 2733 kfree_skb(skb); 2734 return NETDEV_TX_OK; 2735 } 2736 } 2737 2738 if (vxlan->cfg.flags & VXLAN_F_PROXY) { 2739 eth = eth_hdr(skb); 2740 if (ntohs(eth->h_proto) == ETH_P_ARP) 2741 return arp_reduce(dev, skb, vni); 2742 #if IS_ENABLED(CONFIG_IPV6) 2743 else if (ntohs(eth->h_proto) == ETH_P_IPV6 && 2744 pskb_may_pull(skb, sizeof(struct ipv6hdr) + 2745 sizeof(struct nd_msg)) && 2746 ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) { 2747 struct nd_msg *m = (struct nd_msg *)(ipv6_hdr(skb) + 1); 2748 2749 if (m->icmph.icmp6_code == 0 && 2750 m->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION) 2751 return neigh_reduce(dev, skb, vni); 2752 } 2753 #endif 2754 } 2755 2756 if (nhid) 2757 return vxlan_xmit_nhid(skb, dev, nhid, vni); 2758 2759 if (vxlan->cfg.flags & VXLAN_F_MDB) { 2760 struct vxlan_mdb_entry *mdb_entry; 2761 2762 rcu_read_lock(); 2763 mdb_entry = vxlan_mdb_entry_skb_get(vxlan, skb, vni); 2764 if (mdb_entry) { 2765 netdev_tx_t ret; 2766 2767 ret = vxlan_mdb_xmit(vxlan, mdb_entry, skb); 2768 rcu_read_unlock(); 2769 return ret; 2770 } 2771 rcu_read_unlock(); 2772 } 2773 2774 eth = eth_hdr(skb); 2775 f = vxlan_find_mac(vxlan, eth->h_dest, vni); 2776 did_rsc = false; 2777 2778 if (f && (f->flags & NTF_ROUTER) && (vxlan->cfg.flags & VXLAN_F_RSC) && 2779 (ntohs(eth->h_proto) == ETH_P_IP || 2780 ntohs(eth->h_proto) == ETH_P_IPV6)) { 2781 did_rsc = route_shortcircuit(dev, skb); 2782 if (did_rsc) 2783 f = vxlan_find_mac(vxlan, eth->h_dest, vni); 2784 } 2785 2786 if (f == NULL) { 2787 f = vxlan_find_mac(vxlan, all_zeros_mac, vni); 2788 if (f == NULL) { 2789 if ((vxlan->cfg.flags & VXLAN_F_L2MISS) && 2790 !is_multicast_ether_addr(eth->h_dest)) 2791 vxlan_fdb_miss(vxlan, eth->h_dest); 2792 2793 dev_core_stats_tx_dropped_inc(dev); 2794 vxlan_vnifilter_count(vxlan, vni, NULL, 2795 VXLAN_VNI_STATS_TX_DROPS, 0); 2796 kfree_skb(skb); 2797 return NETDEV_TX_OK; 2798 } 2799 } 2800 2801 if (rcu_access_pointer(f->nh)) { 2802 vxlan_xmit_nh(skb, dev, f, 2803 (vni ? : vxlan->default_dst.remote_vni), did_rsc); 2804 } else { 2805 list_for_each_entry_rcu(rdst, &f->remotes, list) { 2806 struct sk_buff *skb1; 2807 2808 if (!fdst) { 2809 fdst = rdst; 2810 continue; 2811 } 2812 skb1 = skb_clone(skb, GFP_ATOMIC); 2813 if (skb1) 2814 vxlan_xmit_one(skb1, dev, vni, rdst, did_rsc); 2815 } 2816 if (fdst) 2817 vxlan_xmit_one(skb, dev, vni, fdst, did_rsc); 2818 else 2819 kfree_skb(skb); 2820 } 2821 2822 return NETDEV_TX_OK; 2823 } 2824 2825 /* Walk the forwarding table and purge stale entries */ 2826 static void vxlan_cleanup(struct timer_list *t) 2827 { 2828 struct vxlan_dev *vxlan = from_timer(vxlan, t, age_timer); 2829 unsigned long next_timer = jiffies + FDB_AGE_INTERVAL; 2830 unsigned int h; 2831 2832 if (!netif_running(vxlan->dev)) 2833 return; 2834 2835 for (h = 0; h < FDB_HASH_SIZE; ++h) { 2836 struct hlist_node *p, *n; 2837 2838 spin_lock(&vxlan->hash_lock[h]); 2839 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) { 2840 struct vxlan_fdb *f 2841 = container_of(p, struct vxlan_fdb, hlist); 2842 unsigned long timeout; 2843 2844 if (f->state & (NUD_PERMANENT | NUD_NOARP)) 2845 continue; 2846 2847 if (f->flags & NTF_EXT_LEARNED) 2848 continue; 2849 2850 timeout = f->used + vxlan->cfg.age_interval * HZ; 2851 if (time_before_eq(timeout, jiffies)) { 2852 netdev_dbg(vxlan->dev, 2853 "garbage collect %pM\n", 2854 f->eth_addr); 2855 f->state = NUD_STALE; 2856 vxlan_fdb_destroy(vxlan, f, true, true); 2857 } else if (time_before(timeout, next_timer)) 2858 next_timer = timeout; 2859 } 2860 spin_unlock(&vxlan->hash_lock[h]); 2861 } 2862 2863 mod_timer(&vxlan->age_timer, next_timer); 2864 } 2865 2866 static void vxlan_vs_del_dev(struct vxlan_dev *vxlan) 2867 { 2868 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id); 2869 2870 spin_lock(&vn->sock_lock); 2871 hlist_del_init_rcu(&vxlan->hlist4.hlist); 2872 #if IS_ENABLED(CONFIG_IPV6) 2873 hlist_del_init_rcu(&vxlan->hlist6.hlist); 2874 #endif 2875 spin_unlock(&vn->sock_lock); 2876 } 2877 2878 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan, 2879 struct vxlan_dev_node *node) 2880 { 2881 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id); 2882 __be32 vni = vxlan->default_dst.remote_vni; 2883 2884 node->vxlan = vxlan; 2885 spin_lock(&vn->sock_lock); 2886 hlist_add_head_rcu(&node->hlist, vni_head(vs, vni)); 2887 spin_unlock(&vn->sock_lock); 2888 } 2889 2890 /* Setup stats when device is created */ 2891 static int vxlan_init(struct net_device *dev) 2892 { 2893 struct vxlan_dev *vxlan = netdev_priv(dev); 2894 int err; 2895 2896 if (vxlan->cfg.flags & VXLAN_F_VNIFILTER) 2897 vxlan_vnigroup_init(vxlan); 2898 2899 err = gro_cells_init(&vxlan->gro_cells, dev); 2900 if (err) 2901 goto err_vnigroup_uninit; 2902 2903 err = vxlan_mdb_init(vxlan); 2904 if (err) 2905 goto err_gro_cells_destroy; 2906 2907 netdev_lockdep_set_classes(dev); 2908 return 0; 2909 2910 err_gro_cells_destroy: 2911 gro_cells_destroy(&vxlan->gro_cells); 2912 err_vnigroup_uninit: 2913 if (vxlan->cfg.flags & VXLAN_F_VNIFILTER) 2914 vxlan_vnigroup_uninit(vxlan); 2915 return err; 2916 } 2917 2918 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan, __be32 vni) 2919 { 2920 struct vxlan_fdb *f; 2921 u32 hash_index = fdb_head_index(vxlan, all_zeros_mac, vni); 2922 2923 spin_lock_bh(&vxlan->hash_lock[hash_index]); 2924 f = __vxlan_find_mac(vxlan, all_zeros_mac, vni); 2925 if (f) 2926 vxlan_fdb_destroy(vxlan, f, true, true); 2927 spin_unlock_bh(&vxlan->hash_lock[hash_index]); 2928 } 2929 2930 static void vxlan_uninit(struct net_device *dev) 2931 { 2932 struct vxlan_dev *vxlan = netdev_priv(dev); 2933 2934 vxlan_mdb_fini(vxlan); 2935 2936 if (vxlan->cfg.flags & VXLAN_F_VNIFILTER) 2937 vxlan_vnigroup_uninit(vxlan); 2938 2939 gro_cells_destroy(&vxlan->gro_cells); 2940 2941 vxlan_fdb_delete_default(vxlan, vxlan->cfg.vni); 2942 } 2943 2944 /* Start ageing timer and join group when device is brought up */ 2945 static int vxlan_open(struct net_device *dev) 2946 { 2947 struct vxlan_dev *vxlan = netdev_priv(dev); 2948 int ret; 2949 2950 ret = vxlan_sock_add(vxlan); 2951 if (ret < 0) 2952 return ret; 2953 2954 ret = vxlan_multicast_join(vxlan); 2955 if (ret) { 2956 vxlan_sock_release(vxlan); 2957 return ret; 2958 } 2959 2960 if (vxlan->cfg.age_interval) 2961 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL); 2962 2963 return ret; 2964 } 2965 2966 struct vxlan_fdb_flush_desc { 2967 bool ignore_default_entry; 2968 unsigned long state; 2969 unsigned long state_mask; 2970 unsigned long flags; 2971 unsigned long flags_mask; 2972 __be32 src_vni; 2973 u32 nhid; 2974 __be32 vni; 2975 __be16 port; 2976 union vxlan_addr dst_ip; 2977 }; 2978 2979 static bool vxlan_fdb_is_default_entry(const struct vxlan_fdb *f, 2980 const struct vxlan_dev *vxlan) 2981 { 2982 return is_zero_ether_addr(f->eth_addr) && f->vni == vxlan->cfg.vni; 2983 } 2984 2985 static bool vxlan_fdb_nhid_matches(const struct vxlan_fdb *f, u32 nhid) 2986 { 2987 struct nexthop *nh = rtnl_dereference(f->nh); 2988 2989 return nh && nh->id == nhid; 2990 } 2991 2992 static bool vxlan_fdb_flush_matches(const struct vxlan_fdb *f, 2993 const struct vxlan_dev *vxlan, 2994 const struct vxlan_fdb_flush_desc *desc) 2995 { 2996 if (desc->state_mask && (f->state & desc->state_mask) != desc->state) 2997 return false; 2998 2999 if (desc->flags_mask && (f->flags & desc->flags_mask) != desc->flags) 3000 return false; 3001 3002 if (desc->ignore_default_entry && vxlan_fdb_is_default_entry(f, vxlan)) 3003 return false; 3004 3005 if (desc->src_vni && f->vni != desc->src_vni) 3006 return false; 3007 3008 if (desc->nhid && !vxlan_fdb_nhid_matches(f, desc->nhid)) 3009 return false; 3010 3011 return true; 3012 } 3013 3014 static bool 3015 vxlan_fdb_flush_should_match_remotes(const struct vxlan_fdb_flush_desc *desc) 3016 { 3017 return desc->vni || desc->port || desc->dst_ip.sa.sa_family; 3018 } 3019 3020 static bool 3021 vxlan_fdb_flush_remote_matches(const struct vxlan_fdb_flush_desc *desc, 3022 const struct vxlan_rdst *rd) 3023 { 3024 if (desc->vni && rd->remote_vni != desc->vni) 3025 return false; 3026 3027 if (desc->port && rd->remote_port != desc->port) 3028 return false; 3029 3030 if (desc->dst_ip.sa.sa_family && 3031 !vxlan_addr_equal(&rd->remote_ip, &desc->dst_ip)) 3032 return false; 3033 3034 return true; 3035 } 3036 3037 static void 3038 vxlan_fdb_flush_match_remotes(struct vxlan_fdb *f, struct vxlan_dev *vxlan, 3039 const struct vxlan_fdb_flush_desc *desc, 3040 bool *p_destroy_fdb) 3041 { 3042 bool remotes_flushed = false; 3043 struct vxlan_rdst *rd, *tmp; 3044 3045 list_for_each_entry_safe(rd, tmp, &f->remotes, list) { 3046 if (!vxlan_fdb_flush_remote_matches(desc, rd)) 3047 continue; 3048 3049 vxlan_fdb_dst_destroy(vxlan, f, rd, true); 3050 remotes_flushed = true; 3051 } 3052 3053 *p_destroy_fdb = remotes_flushed && list_empty(&f->remotes); 3054 } 3055 3056 /* Purge the forwarding table */ 3057 static void vxlan_flush(struct vxlan_dev *vxlan, 3058 const struct vxlan_fdb_flush_desc *desc) 3059 { 3060 bool match_remotes = vxlan_fdb_flush_should_match_remotes(desc); 3061 unsigned int h; 3062 3063 for (h = 0; h < FDB_HASH_SIZE; ++h) { 3064 struct hlist_node *p, *n; 3065 3066 spin_lock_bh(&vxlan->hash_lock[h]); 3067 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) { 3068 struct vxlan_fdb *f 3069 = container_of(p, struct vxlan_fdb, hlist); 3070 3071 if (!vxlan_fdb_flush_matches(f, vxlan, desc)) 3072 continue; 3073 3074 if (match_remotes) { 3075 bool destroy_fdb = false; 3076 3077 vxlan_fdb_flush_match_remotes(f, vxlan, desc, 3078 &destroy_fdb); 3079 3080 if (!destroy_fdb) 3081 continue; 3082 } 3083 3084 vxlan_fdb_destroy(vxlan, f, true, true); 3085 } 3086 spin_unlock_bh(&vxlan->hash_lock[h]); 3087 } 3088 } 3089 3090 static const struct nla_policy vxlan_del_bulk_policy[NDA_MAX + 1] = { 3091 [NDA_SRC_VNI] = { .type = NLA_U32 }, 3092 [NDA_NH_ID] = { .type = NLA_U32 }, 3093 [NDA_VNI] = { .type = NLA_U32 }, 3094 [NDA_PORT] = { .type = NLA_U16 }, 3095 [NDA_DST] = NLA_POLICY_RANGE(NLA_BINARY, sizeof(struct in_addr), 3096 sizeof(struct in6_addr)), 3097 [NDA_NDM_STATE_MASK] = { .type = NLA_U16 }, 3098 [NDA_NDM_FLAGS_MASK] = { .type = NLA_U8 }, 3099 }; 3100 3101 #define VXLAN_FDB_FLUSH_IGNORED_NDM_FLAGS (NTF_MASTER | NTF_SELF) 3102 #define VXLAN_FDB_FLUSH_ALLOWED_NDM_STATES (NUD_PERMANENT | NUD_NOARP) 3103 #define VXLAN_FDB_FLUSH_ALLOWED_NDM_FLAGS (NTF_EXT_LEARNED | NTF_OFFLOADED | \ 3104 NTF_ROUTER) 3105 3106 static int vxlan_fdb_delete_bulk(struct nlmsghdr *nlh, struct net_device *dev, 3107 struct netlink_ext_ack *extack) 3108 { 3109 struct vxlan_dev *vxlan = netdev_priv(dev); 3110 struct vxlan_fdb_flush_desc desc = {}; 3111 struct ndmsg *ndm = nlmsg_data(nlh); 3112 struct nlattr *tb[NDA_MAX + 1]; 3113 u8 ndm_flags; 3114 int err; 3115 3116 ndm_flags = ndm->ndm_flags & ~VXLAN_FDB_FLUSH_IGNORED_NDM_FLAGS; 3117 3118 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, vxlan_del_bulk_policy, 3119 extack); 3120 if (err) 3121 return err; 3122 3123 if (ndm_flags & ~VXLAN_FDB_FLUSH_ALLOWED_NDM_FLAGS) { 3124 NL_SET_ERR_MSG(extack, "Unsupported fdb flush ndm flag bits set"); 3125 return -EINVAL; 3126 } 3127 if (ndm->ndm_state & ~VXLAN_FDB_FLUSH_ALLOWED_NDM_STATES) { 3128 NL_SET_ERR_MSG(extack, "Unsupported fdb flush ndm state bits set"); 3129 return -EINVAL; 3130 } 3131 3132 desc.state = ndm->ndm_state; 3133 desc.flags = ndm_flags; 3134 3135 if (tb[NDA_NDM_STATE_MASK]) 3136 desc.state_mask = nla_get_u16(tb[NDA_NDM_STATE_MASK]); 3137 3138 if (tb[NDA_NDM_FLAGS_MASK]) 3139 desc.flags_mask = nla_get_u8(tb[NDA_NDM_FLAGS_MASK]); 3140 3141 if (tb[NDA_SRC_VNI]) 3142 desc.src_vni = cpu_to_be32(nla_get_u32(tb[NDA_SRC_VNI])); 3143 3144 if (tb[NDA_NH_ID]) 3145 desc.nhid = nla_get_u32(tb[NDA_NH_ID]); 3146 3147 if (tb[NDA_VNI]) 3148 desc.vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI])); 3149 3150 if (tb[NDA_PORT]) 3151 desc.port = nla_get_be16(tb[NDA_PORT]); 3152 3153 if (tb[NDA_DST]) { 3154 union vxlan_addr ip; 3155 3156 err = vxlan_nla_get_addr(&ip, tb[NDA_DST]); 3157 if (err) { 3158 NL_SET_ERR_MSG_ATTR(extack, tb[NDA_DST], 3159 "Unsupported address family"); 3160 return err; 3161 } 3162 desc.dst_ip = ip; 3163 } 3164 3165 vxlan_flush(vxlan, &desc); 3166 3167 return 0; 3168 } 3169 3170 /* Cleanup timer and forwarding table on shutdown */ 3171 static int vxlan_stop(struct net_device *dev) 3172 { 3173 struct vxlan_dev *vxlan = netdev_priv(dev); 3174 struct vxlan_fdb_flush_desc desc = { 3175 /* Default entry is deleted at vxlan_uninit. */ 3176 .ignore_default_entry = true, 3177 .state = 0, 3178 .state_mask = NUD_PERMANENT | NUD_NOARP, 3179 }; 3180 3181 vxlan_multicast_leave(vxlan); 3182 3183 del_timer_sync(&vxlan->age_timer); 3184 3185 vxlan_flush(vxlan, &desc); 3186 vxlan_sock_release(vxlan); 3187 3188 return 0; 3189 } 3190 3191 /* Stub, nothing needs to be done. */ 3192 static void vxlan_set_multicast_list(struct net_device *dev) 3193 { 3194 } 3195 3196 static int vxlan_change_mtu(struct net_device *dev, int new_mtu) 3197 { 3198 struct vxlan_dev *vxlan = netdev_priv(dev); 3199 struct vxlan_rdst *dst = &vxlan->default_dst; 3200 struct net_device *lowerdev = __dev_get_by_index(vxlan->net, 3201 dst->remote_ifindex); 3202 3203 /* This check is different than dev->max_mtu, because it looks at 3204 * the lowerdev->mtu, rather than the static dev->max_mtu 3205 */ 3206 if (lowerdev) { 3207 int max_mtu = lowerdev->mtu - vxlan_headroom(vxlan->cfg.flags); 3208 if (new_mtu > max_mtu) 3209 return -EINVAL; 3210 } 3211 3212 WRITE_ONCE(dev->mtu, new_mtu); 3213 return 0; 3214 } 3215 3216 static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb) 3217 { 3218 struct vxlan_dev *vxlan = netdev_priv(dev); 3219 struct ip_tunnel_info *info = skb_tunnel_info(skb); 3220 __be16 sport, dport; 3221 3222 sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min, 3223 vxlan->cfg.port_max, true); 3224 dport = info->key.tp_dst ? : vxlan->cfg.dst_port; 3225 3226 if (ip_tunnel_info_af(info) == AF_INET) { 3227 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock); 3228 struct rtable *rt; 3229 3230 if (!sock4) 3231 return -EIO; 3232 3233 rt = udp_tunnel_dst_lookup(skb, dev, vxlan->net, 0, 3234 &info->key.u.ipv4.src, 3235 &info->key, 3236 sport, dport, info->key.tos, 3237 &info->dst_cache); 3238 if (IS_ERR(rt)) 3239 return PTR_ERR(rt); 3240 ip_rt_put(rt); 3241 } else { 3242 #if IS_ENABLED(CONFIG_IPV6) 3243 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock); 3244 struct dst_entry *ndst; 3245 3246 if (!sock6) 3247 return -EIO; 3248 3249 ndst = udp_tunnel6_dst_lookup(skb, dev, vxlan->net, sock6->sock, 3250 0, &info->key.u.ipv6.src, 3251 &info->key, 3252 sport, dport, info->key.tos, 3253 &info->dst_cache); 3254 if (IS_ERR(ndst)) 3255 return PTR_ERR(ndst); 3256 dst_release(ndst); 3257 #else /* !CONFIG_IPV6 */ 3258 return -EPFNOSUPPORT; 3259 #endif 3260 } 3261 info->key.tp_src = sport; 3262 info->key.tp_dst = dport; 3263 return 0; 3264 } 3265 3266 static const struct net_device_ops vxlan_netdev_ether_ops = { 3267 .ndo_init = vxlan_init, 3268 .ndo_uninit = vxlan_uninit, 3269 .ndo_open = vxlan_open, 3270 .ndo_stop = vxlan_stop, 3271 .ndo_start_xmit = vxlan_xmit, 3272 .ndo_set_rx_mode = vxlan_set_multicast_list, 3273 .ndo_change_mtu = vxlan_change_mtu, 3274 .ndo_validate_addr = eth_validate_addr, 3275 .ndo_set_mac_address = eth_mac_addr, 3276 .ndo_fdb_add = vxlan_fdb_add, 3277 .ndo_fdb_del = vxlan_fdb_delete, 3278 .ndo_fdb_del_bulk = vxlan_fdb_delete_bulk, 3279 .ndo_fdb_dump = vxlan_fdb_dump, 3280 .ndo_fdb_get = vxlan_fdb_get, 3281 .ndo_mdb_add = vxlan_mdb_add, 3282 .ndo_mdb_del = vxlan_mdb_del, 3283 .ndo_mdb_del_bulk = vxlan_mdb_del_bulk, 3284 .ndo_mdb_dump = vxlan_mdb_dump, 3285 .ndo_mdb_get = vxlan_mdb_get, 3286 .ndo_fill_metadata_dst = vxlan_fill_metadata_dst, 3287 }; 3288 3289 static const struct net_device_ops vxlan_netdev_raw_ops = { 3290 .ndo_init = vxlan_init, 3291 .ndo_uninit = vxlan_uninit, 3292 .ndo_open = vxlan_open, 3293 .ndo_stop = vxlan_stop, 3294 .ndo_start_xmit = vxlan_xmit, 3295 .ndo_change_mtu = vxlan_change_mtu, 3296 .ndo_fill_metadata_dst = vxlan_fill_metadata_dst, 3297 }; 3298 3299 /* Info for udev, that this is a virtual tunnel endpoint */ 3300 static const struct device_type vxlan_type = { 3301 .name = "vxlan", 3302 }; 3303 3304 /* Calls the ndo_udp_tunnel_add of the caller in order to 3305 * supply the listening VXLAN udp ports. Callers are expected 3306 * to implement the ndo_udp_tunnel_add. 3307 */ 3308 static void vxlan_offload_rx_ports(struct net_device *dev, bool push) 3309 { 3310 struct vxlan_sock *vs; 3311 struct net *net = dev_net(dev); 3312 struct vxlan_net *vn = net_generic(net, vxlan_net_id); 3313 unsigned int i; 3314 3315 spin_lock(&vn->sock_lock); 3316 for (i = 0; i < PORT_HASH_SIZE; ++i) { 3317 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) { 3318 unsigned short type; 3319 3320 if (vs->flags & VXLAN_F_GPE) 3321 type = UDP_TUNNEL_TYPE_VXLAN_GPE; 3322 else 3323 type = UDP_TUNNEL_TYPE_VXLAN; 3324 3325 if (push) 3326 udp_tunnel_push_rx_port(dev, vs->sock, type); 3327 else 3328 udp_tunnel_drop_rx_port(dev, vs->sock, type); 3329 } 3330 } 3331 spin_unlock(&vn->sock_lock); 3332 } 3333 3334 /* Initialize the device structure. */ 3335 static void vxlan_setup(struct net_device *dev) 3336 { 3337 struct vxlan_dev *vxlan = netdev_priv(dev); 3338 unsigned int h; 3339 3340 eth_hw_addr_random(dev); 3341 ether_setup(dev); 3342 3343 dev->needs_free_netdev = true; 3344 SET_NETDEV_DEVTYPE(dev, &vxlan_type); 3345 3346 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST; 3347 dev->features |= NETIF_F_RXCSUM; 3348 dev->features |= NETIF_F_GSO_SOFTWARE; 3349 3350 dev->vlan_features = dev->features; 3351 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST; 3352 dev->hw_features |= NETIF_F_RXCSUM; 3353 dev->hw_features |= NETIF_F_GSO_SOFTWARE; 3354 netif_keep_dst(dev); 3355 dev->priv_flags |= IFF_NO_QUEUE; 3356 dev->change_proto_down = true; 3357 dev->lltx = true; 3358 3359 /* MTU range: 68 - 65535 */ 3360 dev->min_mtu = ETH_MIN_MTU; 3361 dev->max_mtu = ETH_MAX_MTU; 3362 3363 dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS; 3364 INIT_LIST_HEAD(&vxlan->next); 3365 3366 timer_setup(&vxlan->age_timer, vxlan_cleanup, TIMER_DEFERRABLE); 3367 3368 vxlan->dev = dev; 3369 3370 for (h = 0; h < FDB_HASH_SIZE; ++h) { 3371 spin_lock_init(&vxlan->hash_lock[h]); 3372 INIT_HLIST_HEAD(&vxlan->fdb_head[h]); 3373 } 3374 } 3375 3376 static void vxlan_ether_setup(struct net_device *dev) 3377 { 3378 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 3379 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 3380 dev->netdev_ops = &vxlan_netdev_ether_ops; 3381 } 3382 3383 static void vxlan_raw_setup(struct net_device *dev) 3384 { 3385 dev->header_ops = NULL; 3386 dev->type = ARPHRD_NONE; 3387 dev->hard_header_len = 0; 3388 dev->addr_len = 0; 3389 dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; 3390 dev->netdev_ops = &vxlan_netdev_raw_ops; 3391 } 3392 3393 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = { 3394 [IFLA_VXLAN_UNSPEC] = { .strict_start_type = IFLA_VXLAN_LOCALBYPASS }, 3395 [IFLA_VXLAN_ID] = { .type = NLA_U32 }, 3396 [IFLA_VXLAN_GROUP] = { .len = sizeof_field(struct iphdr, daddr) }, 3397 [IFLA_VXLAN_GROUP6] = { .len = sizeof(struct in6_addr) }, 3398 [IFLA_VXLAN_LINK] = { .type = NLA_U32 }, 3399 [IFLA_VXLAN_LOCAL] = { .len = sizeof_field(struct iphdr, saddr) }, 3400 [IFLA_VXLAN_LOCAL6] = { .len = sizeof(struct in6_addr) }, 3401 [IFLA_VXLAN_TOS] = { .type = NLA_U8 }, 3402 [IFLA_VXLAN_TTL] = { .type = NLA_U8 }, 3403 [IFLA_VXLAN_LABEL] = { .type = NLA_U32 }, 3404 [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 }, 3405 [IFLA_VXLAN_AGEING] = { .type = NLA_U32 }, 3406 [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 }, 3407 [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) }, 3408 [IFLA_VXLAN_PROXY] = { .type = NLA_U8 }, 3409 [IFLA_VXLAN_RSC] = { .type = NLA_U8 }, 3410 [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 }, 3411 [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 }, 3412 [IFLA_VXLAN_COLLECT_METADATA] = { .type = NLA_U8 }, 3413 [IFLA_VXLAN_PORT] = { .type = NLA_U16 }, 3414 [IFLA_VXLAN_UDP_CSUM] = { .type = NLA_U8 }, 3415 [IFLA_VXLAN_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 }, 3416 [IFLA_VXLAN_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 }, 3417 [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 }, 3418 [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 }, 3419 [IFLA_VXLAN_GBP] = { .type = NLA_FLAG, }, 3420 [IFLA_VXLAN_GPE] = { .type = NLA_FLAG, }, 3421 [IFLA_VXLAN_REMCSUM_NOPARTIAL] = { .type = NLA_FLAG }, 3422 [IFLA_VXLAN_TTL_INHERIT] = { .type = NLA_FLAG }, 3423 [IFLA_VXLAN_DF] = { .type = NLA_U8 }, 3424 [IFLA_VXLAN_VNIFILTER] = { .type = NLA_U8 }, 3425 [IFLA_VXLAN_LOCALBYPASS] = NLA_POLICY_MAX(NLA_U8, 1), 3426 [IFLA_VXLAN_LABEL_POLICY] = NLA_POLICY_MAX(NLA_U32, VXLAN_LABEL_MAX), 3427 }; 3428 3429 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[], 3430 struct netlink_ext_ack *extack) 3431 { 3432 if (tb[IFLA_ADDRESS]) { 3433 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) { 3434 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS], 3435 "Provided link layer address is not Ethernet"); 3436 return -EINVAL; 3437 } 3438 3439 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) { 3440 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS], 3441 "Provided Ethernet address is not unicast"); 3442 return -EADDRNOTAVAIL; 3443 } 3444 } 3445 3446 if (tb[IFLA_MTU]) { 3447 u32 mtu = nla_get_u32(tb[IFLA_MTU]); 3448 3449 if (mtu < ETH_MIN_MTU || mtu > ETH_MAX_MTU) { 3450 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_MTU], 3451 "MTU must be between 68 and 65535"); 3452 return -EINVAL; 3453 } 3454 } 3455 3456 if (!data) { 3457 NL_SET_ERR_MSG(extack, 3458 "Required attributes not provided to perform the operation"); 3459 return -EINVAL; 3460 } 3461 3462 if (data[IFLA_VXLAN_ID]) { 3463 u32 id = nla_get_u32(data[IFLA_VXLAN_ID]); 3464 3465 if (id >= VXLAN_N_VID) { 3466 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_ID], 3467 "VXLAN ID must be lower than 16777216"); 3468 return -ERANGE; 3469 } 3470 } 3471 3472 if (data[IFLA_VXLAN_PORT_RANGE]) { 3473 const struct ifla_vxlan_port_range *p 3474 = nla_data(data[IFLA_VXLAN_PORT_RANGE]); 3475 3476 if (ntohs(p->high) < ntohs(p->low)) { 3477 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_PORT_RANGE], 3478 "Invalid source port range"); 3479 return -EINVAL; 3480 } 3481 } 3482 3483 if (data[IFLA_VXLAN_DF]) { 3484 enum ifla_vxlan_df df = nla_get_u8(data[IFLA_VXLAN_DF]); 3485 3486 if (df < 0 || df > VXLAN_DF_MAX) { 3487 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_DF], 3488 "Invalid DF attribute"); 3489 return -EINVAL; 3490 } 3491 } 3492 3493 return 0; 3494 } 3495 3496 static void vxlan_get_drvinfo(struct net_device *netdev, 3497 struct ethtool_drvinfo *drvinfo) 3498 { 3499 strscpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version)); 3500 strscpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver)); 3501 } 3502 3503 static int vxlan_get_link_ksettings(struct net_device *dev, 3504 struct ethtool_link_ksettings *cmd) 3505 { 3506 struct vxlan_dev *vxlan = netdev_priv(dev); 3507 struct vxlan_rdst *dst = &vxlan->default_dst; 3508 struct net_device *lowerdev = __dev_get_by_index(vxlan->net, 3509 dst->remote_ifindex); 3510 3511 if (!lowerdev) { 3512 cmd->base.duplex = DUPLEX_UNKNOWN; 3513 cmd->base.port = PORT_OTHER; 3514 cmd->base.speed = SPEED_UNKNOWN; 3515 3516 return 0; 3517 } 3518 3519 return __ethtool_get_link_ksettings(lowerdev, cmd); 3520 } 3521 3522 static const struct ethtool_ops vxlan_ethtool_ops = { 3523 .get_drvinfo = vxlan_get_drvinfo, 3524 .get_link = ethtool_op_get_link, 3525 .get_link_ksettings = vxlan_get_link_ksettings, 3526 }; 3527 3528 static struct socket *vxlan_create_sock(struct net *net, bool ipv6, 3529 __be16 port, u32 flags, int ifindex) 3530 { 3531 struct socket *sock; 3532 struct udp_port_cfg udp_conf; 3533 int err; 3534 3535 memset(&udp_conf, 0, sizeof(udp_conf)); 3536 3537 if (ipv6) { 3538 udp_conf.family = AF_INET6; 3539 udp_conf.use_udp6_rx_checksums = 3540 !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX); 3541 udp_conf.ipv6_v6only = 1; 3542 } else { 3543 udp_conf.family = AF_INET; 3544 } 3545 3546 udp_conf.local_udp_port = port; 3547 udp_conf.bind_ifindex = ifindex; 3548 3549 /* Open UDP socket */ 3550 err = udp_sock_create(net, &udp_conf, &sock); 3551 if (err < 0) 3552 return ERR_PTR(err); 3553 3554 udp_allow_gso(sock->sk); 3555 return sock; 3556 } 3557 3558 /* Create new listen socket if needed */ 3559 static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6, 3560 __be16 port, u32 flags, 3561 int ifindex) 3562 { 3563 struct vxlan_net *vn = net_generic(net, vxlan_net_id); 3564 struct vxlan_sock *vs; 3565 struct socket *sock; 3566 unsigned int h; 3567 struct udp_tunnel_sock_cfg tunnel_cfg; 3568 3569 vs = kzalloc(sizeof(*vs), GFP_KERNEL); 3570 if (!vs) 3571 return ERR_PTR(-ENOMEM); 3572 3573 for (h = 0; h < VNI_HASH_SIZE; ++h) 3574 INIT_HLIST_HEAD(&vs->vni_list[h]); 3575 3576 sock = vxlan_create_sock(net, ipv6, port, flags, ifindex); 3577 if (IS_ERR(sock)) { 3578 kfree(vs); 3579 return ERR_CAST(sock); 3580 } 3581 3582 vs->sock = sock; 3583 refcount_set(&vs->refcnt, 1); 3584 vs->flags = (flags & VXLAN_F_RCV_FLAGS); 3585 3586 spin_lock(&vn->sock_lock); 3587 hlist_add_head_rcu(&vs->hlist, vs_head(net, port)); 3588 udp_tunnel_notify_add_rx_port(sock, 3589 (vs->flags & VXLAN_F_GPE) ? 3590 UDP_TUNNEL_TYPE_VXLAN_GPE : 3591 UDP_TUNNEL_TYPE_VXLAN); 3592 spin_unlock(&vn->sock_lock); 3593 3594 /* Mark socket as an encapsulation socket. */ 3595 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg)); 3596 tunnel_cfg.sk_user_data = vs; 3597 tunnel_cfg.encap_type = 1; 3598 tunnel_cfg.encap_rcv = vxlan_rcv; 3599 tunnel_cfg.encap_err_lookup = vxlan_err_lookup; 3600 tunnel_cfg.encap_destroy = NULL; 3601 if (vs->flags & VXLAN_F_GPE) { 3602 tunnel_cfg.gro_receive = vxlan_gpe_gro_receive; 3603 tunnel_cfg.gro_complete = vxlan_gpe_gro_complete; 3604 } else { 3605 tunnel_cfg.gro_receive = vxlan_gro_receive; 3606 tunnel_cfg.gro_complete = vxlan_gro_complete; 3607 } 3608 3609 setup_udp_tunnel_sock(net, sock, &tunnel_cfg); 3610 3611 return vs; 3612 } 3613 3614 static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6) 3615 { 3616 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id); 3617 bool metadata = vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA; 3618 struct vxlan_sock *vs = NULL; 3619 struct vxlan_dev_node *node; 3620 int l3mdev_index = 0; 3621 3622 if (vxlan->cfg.remote_ifindex) 3623 l3mdev_index = l3mdev_master_upper_ifindex_by_index( 3624 vxlan->net, vxlan->cfg.remote_ifindex); 3625 3626 if (!vxlan->cfg.no_share) { 3627 spin_lock(&vn->sock_lock); 3628 vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET, 3629 vxlan->cfg.dst_port, vxlan->cfg.flags, 3630 l3mdev_index); 3631 if (vs && !refcount_inc_not_zero(&vs->refcnt)) { 3632 spin_unlock(&vn->sock_lock); 3633 return -EBUSY; 3634 } 3635 spin_unlock(&vn->sock_lock); 3636 } 3637 if (!vs) 3638 vs = vxlan_socket_create(vxlan->net, ipv6, 3639 vxlan->cfg.dst_port, vxlan->cfg.flags, 3640 l3mdev_index); 3641 if (IS_ERR(vs)) 3642 return PTR_ERR(vs); 3643 #if IS_ENABLED(CONFIG_IPV6) 3644 if (ipv6) { 3645 rcu_assign_pointer(vxlan->vn6_sock, vs); 3646 node = &vxlan->hlist6; 3647 } else 3648 #endif 3649 { 3650 rcu_assign_pointer(vxlan->vn4_sock, vs); 3651 node = &vxlan->hlist4; 3652 } 3653 3654 if (metadata && (vxlan->cfg.flags & VXLAN_F_VNIFILTER)) 3655 vxlan_vs_add_vnigrp(vxlan, vs, ipv6); 3656 else 3657 vxlan_vs_add_dev(vs, vxlan, node); 3658 3659 return 0; 3660 } 3661 3662 static int vxlan_sock_add(struct vxlan_dev *vxlan) 3663 { 3664 bool metadata = vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA; 3665 bool ipv6 = vxlan->cfg.flags & VXLAN_F_IPV6 || metadata; 3666 bool ipv4 = !ipv6 || metadata; 3667 int ret = 0; 3668 3669 RCU_INIT_POINTER(vxlan->vn4_sock, NULL); 3670 #if IS_ENABLED(CONFIG_IPV6) 3671 RCU_INIT_POINTER(vxlan->vn6_sock, NULL); 3672 if (ipv6) { 3673 ret = __vxlan_sock_add(vxlan, true); 3674 if (ret < 0 && ret != -EAFNOSUPPORT) 3675 ipv4 = false; 3676 } 3677 #endif 3678 if (ipv4) 3679 ret = __vxlan_sock_add(vxlan, false); 3680 if (ret < 0) 3681 vxlan_sock_release(vxlan); 3682 return ret; 3683 } 3684 3685 int vxlan_vni_in_use(struct net *src_net, struct vxlan_dev *vxlan, 3686 struct vxlan_config *conf, __be32 vni) 3687 { 3688 struct vxlan_net *vn = net_generic(src_net, vxlan_net_id); 3689 struct vxlan_dev *tmp; 3690 3691 list_for_each_entry(tmp, &vn->vxlan_list, next) { 3692 if (tmp == vxlan) 3693 continue; 3694 if (tmp->cfg.flags & VXLAN_F_VNIFILTER) { 3695 if (!vxlan_vnifilter_lookup(tmp, vni)) 3696 continue; 3697 } else if (tmp->cfg.vni != vni) { 3698 continue; 3699 } 3700 if (tmp->cfg.dst_port != conf->dst_port) 3701 continue; 3702 if ((tmp->cfg.flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)) != 3703 (conf->flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6))) 3704 continue; 3705 3706 if ((conf->flags & VXLAN_F_IPV6_LINKLOCAL) && 3707 tmp->cfg.remote_ifindex != conf->remote_ifindex) 3708 continue; 3709 3710 return -EEXIST; 3711 } 3712 3713 return 0; 3714 } 3715 3716 static int vxlan_config_validate(struct net *src_net, struct vxlan_config *conf, 3717 struct net_device **lower, 3718 struct vxlan_dev *old, 3719 struct netlink_ext_ack *extack) 3720 { 3721 bool use_ipv6 = false; 3722 3723 if (conf->flags & VXLAN_F_GPE) { 3724 /* For now, allow GPE only together with 3725 * COLLECT_METADATA. This can be relaxed later; in such 3726 * case, the other side of the PtP link will have to be 3727 * provided. 3728 */ 3729 if ((conf->flags & ~VXLAN_F_ALLOWED_GPE) || 3730 !(conf->flags & VXLAN_F_COLLECT_METADATA)) { 3731 NL_SET_ERR_MSG(extack, 3732 "VXLAN GPE does not support this combination of attributes"); 3733 return -EINVAL; 3734 } 3735 } 3736 3737 if (!conf->remote_ip.sa.sa_family && !conf->saddr.sa.sa_family) { 3738 /* Unless IPv6 is explicitly requested, assume IPv4 */ 3739 conf->remote_ip.sa.sa_family = AF_INET; 3740 conf->saddr.sa.sa_family = AF_INET; 3741 } else if (!conf->remote_ip.sa.sa_family) { 3742 conf->remote_ip.sa.sa_family = conf->saddr.sa.sa_family; 3743 } else if (!conf->saddr.sa.sa_family) { 3744 conf->saddr.sa.sa_family = conf->remote_ip.sa.sa_family; 3745 } 3746 3747 if (conf->saddr.sa.sa_family != conf->remote_ip.sa.sa_family) { 3748 NL_SET_ERR_MSG(extack, 3749 "Local and remote address must be from the same family"); 3750 return -EINVAL; 3751 } 3752 3753 if (vxlan_addr_multicast(&conf->saddr)) { 3754 NL_SET_ERR_MSG(extack, "Local address cannot be multicast"); 3755 return -EINVAL; 3756 } 3757 3758 if (conf->saddr.sa.sa_family == AF_INET6) { 3759 if (!IS_ENABLED(CONFIG_IPV6)) { 3760 NL_SET_ERR_MSG(extack, 3761 "IPv6 support not enabled in the kernel"); 3762 return -EPFNOSUPPORT; 3763 } 3764 use_ipv6 = true; 3765 conf->flags |= VXLAN_F_IPV6; 3766 3767 if (!(conf->flags & VXLAN_F_COLLECT_METADATA)) { 3768 int local_type = 3769 ipv6_addr_type(&conf->saddr.sin6.sin6_addr); 3770 int remote_type = 3771 ipv6_addr_type(&conf->remote_ip.sin6.sin6_addr); 3772 3773 if (local_type & IPV6_ADDR_LINKLOCAL) { 3774 if (!(remote_type & IPV6_ADDR_LINKLOCAL) && 3775 (remote_type != IPV6_ADDR_ANY)) { 3776 NL_SET_ERR_MSG(extack, 3777 "Invalid combination of local and remote address scopes"); 3778 return -EINVAL; 3779 } 3780 3781 conf->flags |= VXLAN_F_IPV6_LINKLOCAL; 3782 } else { 3783 if (remote_type == 3784 (IPV6_ADDR_UNICAST | IPV6_ADDR_LINKLOCAL)) { 3785 NL_SET_ERR_MSG(extack, 3786 "Invalid combination of local and remote address scopes"); 3787 return -EINVAL; 3788 } 3789 3790 conf->flags &= ~VXLAN_F_IPV6_LINKLOCAL; 3791 } 3792 } 3793 } 3794 3795 if (conf->label && !use_ipv6) { 3796 NL_SET_ERR_MSG(extack, 3797 "Label attribute only applies to IPv6 VXLAN devices"); 3798 return -EINVAL; 3799 } 3800 3801 if (conf->label_policy && !use_ipv6) { 3802 NL_SET_ERR_MSG(extack, 3803 "Label policy only applies to IPv6 VXLAN devices"); 3804 return -EINVAL; 3805 } 3806 3807 if (conf->remote_ifindex) { 3808 struct net_device *lowerdev; 3809 3810 lowerdev = __dev_get_by_index(src_net, conf->remote_ifindex); 3811 if (!lowerdev) { 3812 NL_SET_ERR_MSG(extack, 3813 "Invalid local interface, device not found"); 3814 return -ENODEV; 3815 } 3816 3817 #if IS_ENABLED(CONFIG_IPV6) 3818 if (use_ipv6) { 3819 struct inet6_dev *idev = __in6_dev_get(lowerdev); 3820 3821 if (idev && idev->cnf.disable_ipv6) { 3822 NL_SET_ERR_MSG(extack, 3823 "IPv6 support disabled by administrator"); 3824 return -EPERM; 3825 } 3826 } 3827 #endif 3828 3829 *lower = lowerdev; 3830 } else { 3831 if (vxlan_addr_multicast(&conf->remote_ip)) { 3832 NL_SET_ERR_MSG(extack, 3833 "Local interface required for multicast remote destination"); 3834 3835 return -EINVAL; 3836 } 3837 3838 #if IS_ENABLED(CONFIG_IPV6) 3839 if (conf->flags & VXLAN_F_IPV6_LINKLOCAL) { 3840 NL_SET_ERR_MSG(extack, 3841 "Local interface required for link-local local/remote addresses"); 3842 return -EINVAL; 3843 } 3844 #endif 3845 3846 *lower = NULL; 3847 } 3848 3849 if (!conf->dst_port) { 3850 if (conf->flags & VXLAN_F_GPE) 3851 conf->dst_port = htons(IANA_VXLAN_GPE_UDP_PORT); 3852 else 3853 conf->dst_port = htons(vxlan_port); 3854 } 3855 3856 if (!conf->age_interval) 3857 conf->age_interval = FDB_AGE_DEFAULT; 3858 3859 if (vxlan_vni_in_use(src_net, old, conf, conf->vni)) { 3860 NL_SET_ERR_MSG(extack, 3861 "A VXLAN device with the specified VNI already exists"); 3862 return -EEXIST; 3863 } 3864 3865 return 0; 3866 } 3867 3868 static void vxlan_config_apply(struct net_device *dev, 3869 struct vxlan_config *conf, 3870 struct net_device *lowerdev, 3871 struct net *src_net, 3872 bool changelink) 3873 { 3874 struct vxlan_dev *vxlan = netdev_priv(dev); 3875 struct vxlan_rdst *dst = &vxlan->default_dst; 3876 unsigned short needed_headroom = ETH_HLEN; 3877 int max_mtu = ETH_MAX_MTU; 3878 u32 flags = conf->flags; 3879 3880 if (!changelink) { 3881 if (flags & VXLAN_F_GPE) 3882 vxlan_raw_setup(dev); 3883 else 3884 vxlan_ether_setup(dev); 3885 3886 if (conf->mtu) 3887 dev->mtu = conf->mtu; 3888 3889 vxlan->net = src_net; 3890 } 3891 3892 dst->remote_vni = conf->vni; 3893 3894 memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip)); 3895 3896 if (lowerdev) { 3897 dst->remote_ifindex = conf->remote_ifindex; 3898 3899 netif_inherit_tso_max(dev, lowerdev); 3900 3901 needed_headroom = lowerdev->hard_header_len; 3902 needed_headroom += lowerdev->needed_headroom; 3903 3904 dev->needed_tailroom = lowerdev->needed_tailroom; 3905 3906 max_mtu = lowerdev->mtu - vxlan_headroom(flags); 3907 if (max_mtu < ETH_MIN_MTU) 3908 max_mtu = ETH_MIN_MTU; 3909 3910 if (!changelink && !conf->mtu) 3911 dev->mtu = max_mtu; 3912 } 3913 3914 if (dev->mtu > max_mtu) 3915 dev->mtu = max_mtu; 3916 3917 if (flags & VXLAN_F_COLLECT_METADATA) 3918 flags |= VXLAN_F_IPV6; 3919 needed_headroom += vxlan_headroom(flags); 3920 dev->needed_headroom = needed_headroom; 3921 3922 memcpy(&vxlan->cfg, conf, sizeof(*conf)); 3923 } 3924 3925 static int vxlan_dev_configure(struct net *src_net, struct net_device *dev, 3926 struct vxlan_config *conf, bool changelink, 3927 struct netlink_ext_ack *extack) 3928 { 3929 struct vxlan_dev *vxlan = netdev_priv(dev); 3930 struct net_device *lowerdev; 3931 int ret; 3932 3933 ret = vxlan_config_validate(src_net, conf, &lowerdev, vxlan, extack); 3934 if (ret) 3935 return ret; 3936 3937 vxlan_config_apply(dev, conf, lowerdev, src_net, changelink); 3938 3939 return 0; 3940 } 3941 3942 static int __vxlan_dev_create(struct net *net, struct net_device *dev, 3943 struct vxlan_config *conf, 3944 struct netlink_ext_ack *extack) 3945 { 3946 struct vxlan_net *vn = net_generic(net, vxlan_net_id); 3947 struct vxlan_dev *vxlan = netdev_priv(dev); 3948 struct net_device *remote_dev = NULL; 3949 struct vxlan_fdb *f = NULL; 3950 bool unregister = false; 3951 struct vxlan_rdst *dst; 3952 int err; 3953 3954 dst = &vxlan->default_dst; 3955 err = vxlan_dev_configure(net, dev, conf, false, extack); 3956 if (err) 3957 return err; 3958 3959 dev->ethtool_ops = &vxlan_ethtool_ops; 3960 3961 /* create an fdb entry for a valid default destination */ 3962 if (!vxlan_addr_any(&dst->remote_ip)) { 3963 err = vxlan_fdb_create(vxlan, all_zeros_mac, 3964 &dst->remote_ip, 3965 NUD_REACHABLE | NUD_PERMANENT, 3966 vxlan->cfg.dst_port, 3967 dst->remote_vni, 3968 dst->remote_vni, 3969 dst->remote_ifindex, 3970 NTF_SELF, 0, &f, extack); 3971 if (err) 3972 return err; 3973 } 3974 3975 err = register_netdevice(dev); 3976 if (err) 3977 goto errout; 3978 unregister = true; 3979 3980 if (dst->remote_ifindex) { 3981 remote_dev = __dev_get_by_index(net, dst->remote_ifindex); 3982 if (!remote_dev) { 3983 err = -ENODEV; 3984 goto errout; 3985 } 3986 3987 err = netdev_upper_dev_link(remote_dev, dev, extack); 3988 if (err) 3989 goto errout; 3990 } 3991 3992 err = rtnl_configure_link(dev, NULL, 0, NULL); 3993 if (err < 0) 3994 goto unlink; 3995 3996 if (f) { 3997 vxlan_fdb_insert(vxlan, all_zeros_mac, dst->remote_vni, f); 3998 3999 /* notify default fdb entry */ 4000 err = vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), 4001 RTM_NEWNEIGH, true, extack); 4002 if (err) { 4003 vxlan_fdb_destroy(vxlan, f, false, false); 4004 if (remote_dev) 4005 netdev_upper_dev_unlink(remote_dev, dev); 4006 goto unregister; 4007 } 4008 } 4009 4010 list_add(&vxlan->next, &vn->vxlan_list); 4011 if (remote_dev) 4012 dst->remote_dev = remote_dev; 4013 return 0; 4014 unlink: 4015 if (remote_dev) 4016 netdev_upper_dev_unlink(remote_dev, dev); 4017 errout: 4018 /* unregister_netdevice() destroys the default FDB entry with deletion 4019 * notification. But the addition notification was not sent yet, so 4020 * destroy the entry by hand here. 4021 */ 4022 if (f) 4023 __vxlan_fdb_free(f); 4024 unregister: 4025 if (unregister) 4026 unregister_netdevice(dev); 4027 return err; 4028 } 4029 4030 /* Set/clear flags based on attribute */ 4031 static int vxlan_nl2flag(struct vxlan_config *conf, struct nlattr *tb[], 4032 int attrtype, unsigned long mask, bool changelink, 4033 bool changelink_supported, 4034 struct netlink_ext_ack *extack) 4035 { 4036 unsigned long flags; 4037 4038 if (!tb[attrtype]) 4039 return 0; 4040 4041 if (changelink && !changelink_supported) { 4042 vxlan_flag_attr_error(attrtype, extack); 4043 return -EOPNOTSUPP; 4044 } 4045 4046 if (vxlan_policy[attrtype].type == NLA_FLAG) 4047 flags = conf->flags | mask; 4048 else if (nla_get_u8(tb[attrtype])) 4049 flags = conf->flags | mask; 4050 else 4051 flags = conf->flags & ~mask; 4052 4053 conf->flags = flags; 4054 4055 return 0; 4056 } 4057 4058 static int vxlan_nl2conf(struct nlattr *tb[], struct nlattr *data[], 4059 struct net_device *dev, struct vxlan_config *conf, 4060 bool changelink, struct netlink_ext_ack *extack) 4061 { 4062 struct vxlan_dev *vxlan = netdev_priv(dev); 4063 int err = 0; 4064 4065 memset(conf, 0, sizeof(*conf)); 4066 4067 /* if changelink operation, start with old existing cfg */ 4068 if (changelink) 4069 memcpy(conf, &vxlan->cfg, sizeof(*conf)); 4070 4071 if (data[IFLA_VXLAN_ID]) { 4072 __be32 vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID])); 4073 4074 if (changelink && (vni != conf->vni)) { 4075 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_ID], "Cannot change VNI"); 4076 return -EOPNOTSUPP; 4077 } 4078 conf->vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID])); 4079 } 4080 4081 if (data[IFLA_VXLAN_GROUP]) { 4082 if (changelink && (conf->remote_ip.sa.sa_family != AF_INET)) { 4083 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP], "New group address family does not match old group"); 4084 return -EOPNOTSUPP; 4085 } 4086 4087 conf->remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]); 4088 conf->remote_ip.sa.sa_family = AF_INET; 4089 } else if (data[IFLA_VXLAN_GROUP6]) { 4090 if (!IS_ENABLED(CONFIG_IPV6)) { 4091 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP6], "IPv6 support not enabled in the kernel"); 4092 return -EPFNOSUPPORT; 4093 } 4094 4095 if (changelink && (conf->remote_ip.sa.sa_family != AF_INET6)) { 4096 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP6], "New group address family does not match old group"); 4097 return -EOPNOTSUPP; 4098 } 4099 4100 conf->remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]); 4101 conf->remote_ip.sa.sa_family = AF_INET6; 4102 } 4103 4104 if (data[IFLA_VXLAN_LOCAL]) { 4105 if (changelink && (conf->saddr.sa.sa_family != AF_INET)) { 4106 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL], "New local address family does not match old"); 4107 return -EOPNOTSUPP; 4108 } 4109 4110 conf->saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]); 4111 conf->saddr.sa.sa_family = AF_INET; 4112 } else if (data[IFLA_VXLAN_LOCAL6]) { 4113 if (!IS_ENABLED(CONFIG_IPV6)) { 4114 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL6], "IPv6 support not enabled in the kernel"); 4115 return -EPFNOSUPPORT; 4116 } 4117 4118 if (changelink && (conf->saddr.sa.sa_family != AF_INET6)) { 4119 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL6], "New local address family does not match old"); 4120 return -EOPNOTSUPP; 4121 } 4122 4123 /* TODO: respect scope id */ 4124 conf->saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]); 4125 conf->saddr.sa.sa_family = AF_INET6; 4126 } 4127 4128 if (data[IFLA_VXLAN_LINK]) 4129 conf->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]); 4130 4131 if (data[IFLA_VXLAN_TOS]) 4132 conf->tos = nla_get_u8(data[IFLA_VXLAN_TOS]); 4133 4134 if (data[IFLA_VXLAN_TTL]) 4135 conf->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]); 4136 4137 if (data[IFLA_VXLAN_TTL_INHERIT]) { 4138 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_TTL_INHERIT, 4139 VXLAN_F_TTL_INHERIT, changelink, false, 4140 extack); 4141 if (err) 4142 return err; 4143 4144 } 4145 4146 if (data[IFLA_VXLAN_LABEL]) 4147 conf->label = nla_get_be32(data[IFLA_VXLAN_LABEL]) & 4148 IPV6_FLOWLABEL_MASK; 4149 if (data[IFLA_VXLAN_LABEL_POLICY]) 4150 conf->label_policy = nla_get_u32(data[IFLA_VXLAN_LABEL_POLICY]); 4151 4152 if (data[IFLA_VXLAN_LEARNING]) { 4153 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_LEARNING, 4154 VXLAN_F_LEARN, changelink, true, 4155 extack); 4156 if (err) 4157 return err; 4158 } else if (!changelink) { 4159 /* default to learn on a new device */ 4160 conf->flags |= VXLAN_F_LEARN; 4161 } 4162 4163 if (data[IFLA_VXLAN_AGEING]) 4164 conf->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]); 4165 4166 if (data[IFLA_VXLAN_PROXY]) { 4167 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_PROXY, 4168 VXLAN_F_PROXY, changelink, false, 4169 extack); 4170 if (err) 4171 return err; 4172 } 4173 4174 if (data[IFLA_VXLAN_RSC]) { 4175 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_RSC, 4176 VXLAN_F_RSC, changelink, false, 4177 extack); 4178 if (err) 4179 return err; 4180 } 4181 4182 if (data[IFLA_VXLAN_L2MISS]) { 4183 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_L2MISS, 4184 VXLAN_F_L2MISS, changelink, false, 4185 extack); 4186 if (err) 4187 return err; 4188 } 4189 4190 if (data[IFLA_VXLAN_L3MISS]) { 4191 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_L3MISS, 4192 VXLAN_F_L3MISS, changelink, false, 4193 extack); 4194 if (err) 4195 return err; 4196 } 4197 4198 if (data[IFLA_VXLAN_LIMIT]) { 4199 if (changelink) { 4200 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LIMIT], 4201 "Cannot change limit"); 4202 return -EOPNOTSUPP; 4203 } 4204 conf->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]); 4205 } 4206 4207 if (data[IFLA_VXLAN_COLLECT_METADATA]) { 4208 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_COLLECT_METADATA, 4209 VXLAN_F_COLLECT_METADATA, changelink, false, 4210 extack); 4211 if (err) 4212 return err; 4213 } 4214 4215 if (data[IFLA_VXLAN_PORT_RANGE]) { 4216 if (!changelink) { 4217 const struct ifla_vxlan_port_range *p 4218 = nla_data(data[IFLA_VXLAN_PORT_RANGE]); 4219 conf->port_min = ntohs(p->low); 4220 conf->port_max = ntohs(p->high); 4221 } else { 4222 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT_RANGE], 4223 "Cannot change port range"); 4224 return -EOPNOTSUPP; 4225 } 4226 } 4227 4228 if (data[IFLA_VXLAN_PORT]) { 4229 if (changelink) { 4230 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT], 4231 "Cannot change port"); 4232 return -EOPNOTSUPP; 4233 } 4234 conf->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]); 4235 } 4236 4237 if (data[IFLA_VXLAN_UDP_CSUM]) { 4238 if (changelink) { 4239 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_UDP_CSUM], 4240 "Cannot change UDP_CSUM flag"); 4241 return -EOPNOTSUPP; 4242 } 4243 if (!nla_get_u8(data[IFLA_VXLAN_UDP_CSUM])) 4244 conf->flags |= VXLAN_F_UDP_ZERO_CSUM_TX; 4245 } 4246 4247 if (data[IFLA_VXLAN_LOCALBYPASS]) { 4248 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_LOCALBYPASS, 4249 VXLAN_F_LOCALBYPASS, changelink, 4250 true, extack); 4251 if (err) 4252 return err; 4253 } else if (!changelink) { 4254 /* default to local bypass on a new device */ 4255 conf->flags |= VXLAN_F_LOCALBYPASS; 4256 } 4257 4258 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]) { 4259 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_UDP_ZERO_CSUM6_TX, 4260 VXLAN_F_UDP_ZERO_CSUM6_TX, changelink, 4261 false, extack); 4262 if (err) 4263 return err; 4264 } 4265 4266 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]) { 4267 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_UDP_ZERO_CSUM6_RX, 4268 VXLAN_F_UDP_ZERO_CSUM6_RX, changelink, 4269 false, extack); 4270 if (err) 4271 return err; 4272 } 4273 4274 if (data[IFLA_VXLAN_REMCSUM_TX]) { 4275 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_TX, 4276 VXLAN_F_REMCSUM_TX, changelink, false, 4277 extack); 4278 if (err) 4279 return err; 4280 } 4281 4282 if (data[IFLA_VXLAN_REMCSUM_RX]) { 4283 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_RX, 4284 VXLAN_F_REMCSUM_RX, changelink, false, 4285 extack); 4286 if (err) 4287 return err; 4288 } 4289 4290 if (data[IFLA_VXLAN_GBP]) { 4291 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_GBP, 4292 VXLAN_F_GBP, changelink, false, extack); 4293 if (err) 4294 return err; 4295 } 4296 4297 if (data[IFLA_VXLAN_GPE]) { 4298 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_GPE, 4299 VXLAN_F_GPE, changelink, false, 4300 extack); 4301 if (err) 4302 return err; 4303 } 4304 4305 if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL]) { 4306 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_NOPARTIAL, 4307 VXLAN_F_REMCSUM_NOPARTIAL, changelink, 4308 false, extack); 4309 if (err) 4310 return err; 4311 } 4312 4313 if (tb[IFLA_MTU]) { 4314 if (changelink) { 4315 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_MTU], 4316 "Cannot change mtu"); 4317 return -EOPNOTSUPP; 4318 } 4319 conf->mtu = nla_get_u32(tb[IFLA_MTU]); 4320 } 4321 4322 if (data[IFLA_VXLAN_DF]) 4323 conf->df = nla_get_u8(data[IFLA_VXLAN_DF]); 4324 4325 if (data[IFLA_VXLAN_VNIFILTER]) { 4326 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_VNIFILTER, 4327 VXLAN_F_VNIFILTER, changelink, false, 4328 extack); 4329 if (err) 4330 return err; 4331 4332 if ((conf->flags & VXLAN_F_VNIFILTER) && 4333 !(conf->flags & VXLAN_F_COLLECT_METADATA)) { 4334 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_VNIFILTER], 4335 "vxlan vnifilter only valid in collect metadata mode"); 4336 return -EINVAL; 4337 } 4338 } 4339 4340 return 0; 4341 } 4342 4343 static int vxlan_newlink(struct net *src_net, struct net_device *dev, 4344 struct nlattr *tb[], struct nlattr *data[], 4345 struct netlink_ext_ack *extack) 4346 { 4347 struct vxlan_config conf; 4348 int err; 4349 4350 err = vxlan_nl2conf(tb, data, dev, &conf, false, extack); 4351 if (err) 4352 return err; 4353 4354 return __vxlan_dev_create(src_net, dev, &conf, extack); 4355 } 4356 4357 static int vxlan_changelink(struct net_device *dev, struct nlattr *tb[], 4358 struct nlattr *data[], 4359 struct netlink_ext_ack *extack) 4360 { 4361 struct vxlan_dev *vxlan = netdev_priv(dev); 4362 struct net_device *lowerdev; 4363 struct vxlan_config conf; 4364 struct vxlan_rdst *dst; 4365 int err; 4366 4367 dst = &vxlan->default_dst; 4368 err = vxlan_nl2conf(tb, data, dev, &conf, true, extack); 4369 if (err) 4370 return err; 4371 4372 err = vxlan_config_validate(vxlan->net, &conf, &lowerdev, 4373 vxlan, extack); 4374 if (err) 4375 return err; 4376 4377 if (dst->remote_dev == lowerdev) 4378 lowerdev = NULL; 4379 4380 err = netdev_adjacent_change_prepare(dst->remote_dev, lowerdev, dev, 4381 extack); 4382 if (err) 4383 return err; 4384 4385 /* handle default dst entry */ 4386 if (!vxlan_addr_equal(&conf.remote_ip, &dst->remote_ip)) { 4387 u32 hash_index = fdb_head_index(vxlan, all_zeros_mac, conf.vni); 4388 4389 spin_lock_bh(&vxlan->hash_lock[hash_index]); 4390 if (!vxlan_addr_any(&conf.remote_ip)) { 4391 err = vxlan_fdb_update(vxlan, all_zeros_mac, 4392 &conf.remote_ip, 4393 NUD_REACHABLE | NUD_PERMANENT, 4394 NLM_F_APPEND | NLM_F_CREATE, 4395 vxlan->cfg.dst_port, 4396 conf.vni, conf.vni, 4397 conf.remote_ifindex, 4398 NTF_SELF, 0, true, extack); 4399 if (err) { 4400 spin_unlock_bh(&vxlan->hash_lock[hash_index]); 4401 netdev_adjacent_change_abort(dst->remote_dev, 4402 lowerdev, dev); 4403 return err; 4404 } 4405 } 4406 if (!vxlan_addr_any(&dst->remote_ip)) 4407 __vxlan_fdb_delete(vxlan, all_zeros_mac, 4408 dst->remote_ip, 4409 vxlan->cfg.dst_port, 4410 dst->remote_vni, 4411 dst->remote_vni, 4412 dst->remote_ifindex, 4413 true); 4414 spin_unlock_bh(&vxlan->hash_lock[hash_index]); 4415 4416 /* If vni filtering device, also update fdb entries of 4417 * all vnis that were using default remote ip 4418 */ 4419 if (vxlan->cfg.flags & VXLAN_F_VNIFILTER) { 4420 err = vxlan_vnilist_update_group(vxlan, &dst->remote_ip, 4421 &conf.remote_ip, extack); 4422 if (err) { 4423 netdev_adjacent_change_abort(dst->remote_dev, 4424 lowerdev, dev); 4425 return err; 4426 } 4427 } 4428 } 4429 4430 if (conf.age_interval != vxlan->cfg.age_interval) 4431 mod_timer(&vxlan->age_timer, jiffies); 4432 4433 netdev_adjacent_change_commit(dst->remote_dev, lowerdev, dev); 4434 if (lowerdev && lowerdev != dst->remote_dev) 4435 dst->remote_dev = lowerdev; 4436 vxlan_config_apply(dev, &conf, lowerdev, vxlan->net, true); 4437 return 0; 4438 } 4439 4440 static void vxlan_dellink(struct net_device *dev, struct list_head *head) 4441 { 4442 struct vxlan_dev *vxlan = netdev_priv(dev); 4443 struct vxlan_fdb_flush_desc desc = { 4444 /* Default entry is deleted at vxlan_uninit. */ 4445 .ignore_default_entry = true, 4446 }; 4447 4448 vxlan_flush(vxlan, &desc); 4449 4450 list_del(&vxlan->next); 4451 unregister_netdevice_queue(dev, head); 4452 if (vxlan->default_dst.remote_dev) 4453 netdev_upper_dev_unlink(vxlan->default_dst.remote_dev, dev); 4454 } 4455 4456 static size_t vxlan_get_size(const struct net_device *dev) 4457 { 4458 return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */ 4459 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */ 4460 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */ 4461 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */ 4462 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */ 4463 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL_INHERIT */ 4464 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */ 4465 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_DF */ 4466 nla_total_size(sizeof(__be32)) + /* IFLA_VXLAN_LABEL */ 4467 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LABEL_POLICY */ 4468 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */ 4469 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */ 4470 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */ 4471 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */ 4472 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */ 4473 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_COLLECT_METADATA */ 4474 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */ 4475 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */ 4476 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */ 4477 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */ 4478 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */ 4479 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */ 4480 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */ 4481 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */ 4482 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LOCALBYPASS */ 4483 /* IFLA_VXLAN_PORT_RANGE */ 4484 nla_total_size(sizeof(struct ifla_vxlan_port_range)) + 4485 nla_total_size(0) + /* IFLA_VXLAN_GBP */ 4486 nla_total_size(0) + /* IFLA_VXLAN_GPE */ 4487 nla_total_size(0) + /* IFLA_VXLAN_REMCSUM_NOPARTIAL */ 4488 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_VNIFILTER */ 4489 0; 4490 } 4491 4492 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev) 4493 { 4494 const struct vxlan_dev *vxlan = netdev_priv(dev); 4495 const struct vxlan_rdst *dst = &vxlan->default_dst; 4496 struct ifla_vxlan_port_range ports = { 4497 .low = htons(vxlan->cfg.port_min), 4498 .high = htons(vxlan->cfg.port_max), 4499 }; 4500 4501 if (nla_put_u32(skb, IFLA_VXLAN_ID, be32_to_cpu(dst->remote_vni))) 4502 goto nla_put_failure; 4503 4504 if (!vxlan_addr_any(&dst->remote_ip)) { 4505 if (dst->remote_ip.sa.sa_family == AF_INET) { 4506 if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP, 4507 dst->remote_ip.sin.sin_addr.s_addr)) 4508 goto nla_put_failure; 4509 #if IS_ENABLED(CONFIG_IPV6) 4510 } else { 4511 if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6, 4512 &dst->remote_ip.sin6.sin6_addr)) 4513 goto nla_put_failure; 4514 #endif 4515 } 4516 } 4517 4518 if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex)) 4519 goto nla_put_failure; 4520 4521 if (!vxlan_addr_any(&vxlan->cfg.saddr)) { 4522 if (vxlan->cfg.saddr.sa.sa_family == AF_INET) { 4523 if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL, 4524 vxlan->cfg.saddr.sin.sin_addr.s_addr)) 4525 goto nla_put_failure; 4526 #if IS_ENABLED(CONFIG_IPV6) 4527 } else { 4528 if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6, 4529 &vxlan->cfg.saddr.sin6.sin6_addr)) 4530 goto nla_put_failure; 4531 #endif 4532 } 4533 } 4534 4535 if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) || 4536 nla_put_u8(skb, IFLA_VXLAN_TTL_INHERIT, 4537 !!(vxlan->cfg.flags & VXLAN_F_TTL_INHERIT)) || 4538 nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) || 4539 nla_put_u8(skb, IFLA_VXLAN_DF, vxlan->cfg.df) || 4540 nla_put_be32(skb, IFLA_VXLAN_LABEL, vxlan->cfg.label) || 4541 nla_put_u32(skb, IFLA_VXLAN_LABEL_POLICY, vxlan->cfg.label_policy) || 4542 nla_put_u8(skb, IFLA_VXLAN_LEARNING, 4543 !!(vxlan->cfg.flags & VXLAN_F_LEARN)) || 4544 nla_put_u8(skb, IFLA_VXLAN_PROXY, 4545 !!(vxlan->cfg.flags & VXLAN_F_PROXY)) || 4546 nla_put_u8(skb, IFLA_VXLAN_RSC, 4547 !!(vxlan->cfg.flags & VXLAN_F_RSC)) || 4548 nla_put_u8(skb, IFLA_VXLAN_L2MISS, 4549 !!(vxlan->cfg.flags & VXLAN_F_L2MISS)) || 4550 nla_put_u8(skb, IFLA_VXLAN_L3MISS, 4551 !!(vxlan->cfg.flags & VXLAN_F_L3MISS)) || 4552 nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA, 4553 !!(vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)) || 4554 nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) || 4555 nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) || 4556 nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) || 4557 nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM, 4558 !(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM_TX)) || 4559 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX, 4560 !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) || 4561 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX, 4562 !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) || 4563 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX, 4564 !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_TX)) || 4565 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX, 4566 !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_RX)) || 4567 nla_put_u8(skb, IFLA_VXLAN_LOCALBYPASS, 4568 !!(vxlan->cfg.flags & VXLAN_F_LOCALBYPASS))) 4569 goto nla_put_failure; 4570 4571 if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports)) 4572 goto nla_put_failure; 4573 4574 if (vxlan->cfg.flags & VXLAN_F_GBP && 4575 nla_put_flag(skb, IFLA_VXLAN_GBP)) 4576 goto nla_put_failure; 4577 4578 if (vxlan->cfg.flags & VXLAN_F_GPE && 4579 nla_put_flag(skb, IFLA_VXLAN_GPE)) 4580 goto nla_put_failure; 4581 4582 if (vxlan->cfg.flags & VXLAN_F_REMCSUM_NOPARTIAL && 4583 nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL)) 4584 goto nla_put_failure; 4585 4586 if (vxlan->cfg.flags & VXLAN_F_VNIFILTER && 4587 nla_put_u8(skb, IFLA_VXLAN_VNIFILTER, 4588 !!(vxlan->cfg.flags & VXLAN_F_VNIFILTER))) 4589 goto nla_put_failure; 4590 4591 return 0; 4592 4593 nla_put_failure: 4594 return -EMSGSIZE; 4595 } 4596 4597 static struct net *vxlan_get_link_net(const struct net_device *dev) 4598 { 4599 struct vxlan_dev *vxlan = netdev_priv(dev); 4600 4601 return READ_ONCE(vxlan->net); 4602 } 4603 4604 static struct rtnl_link_ops vxlan_link_ops __read_mostly = { 4605 .kind = "vxlan", 4606 .maxtype = IFLA_VXLAN_MAX, 4607 .policy = vxlan_policy, 4608 .priv_size = sizeof(struct vxlan_dev), 4609 .setup = vxlan_setup, 4610 .validate = vxlan_validate, 4611 .newlink = vxlan_newlink, 4612 .changelink = vxlan_changelink, 4613 .dellink = vxlan_dellink, 4614 .get_size = vxlan_get_size, 4615 .fill_info = vxlan_fill_info, 4616 .get_link_net = vxlan_get_link_net, 4617 }; 4618 4619 struct net_device *vxlan_dev_create(struct net *net, const char *name, 4620 u8 name_assign_type, 4621 struct vxlan_config *conf) 4622 { 4623 struct nlattr *tb[IFLA_MAX + 1]; 4624 struct net_device *dev; 4625 int err; 4626 4627 memset(&tb, 0, sizeof(tb)); 4628 4629 dev = rtnl_create_link(net, name, name_assign_type, 4630 &vxlan_link_ops, tb, NULL); 4631 if (IS_ERR(dev)) 4632 return dev; 4633 4634 err = __vxlan_dev_create(net, dev, conf, NULL); 4635 if (err < 0) { 4636 free_netdev(dev); 4637 return ERR_PTR(err); 4638 } 4639 4640 err = rtnl_configure_link(dev, NULL, 0, NULL); 4641 if (err < 0) { 4642 LIST_HEAD(list_kill); 4643 4644 vxlan_dellink(dev, &list_kill); 4645 unregister_netdevice_many(&list_kill); 4646 return ERR_PTR(err); 4647 } 4648 4649 return dev; 4650 } 4651 EXPORT_SYMBOL_GPL(vxlan_dev_create); 4652 4653 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn, 4654 struct net_device *dev) 4655 { 4656 struct vxlan_dev *vxlan, *next; 4657 LIST_HEAD(list_kill); 4658 4659 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) { 4660 struct vxlan_rdst *dst = &vxlan->default_dst; 4661 4662 /* In case we created vxlan device with carrier 4663 * and we loose the carrier due to module unload 4664 * we also need to remove vxlan device. In other 4665 * cases, it's not necessary and remote_ifindex 4666 * is 0 here, so no matches. 4667 */ 4668 if (dst->remote_ifindex == dev->ifindex) 4669 vxlan_dellink(vxlan->dev, &list_kill); 4670 } 4671 4672 unregister_netdevice_many(&list_kill); 4673 } 4674 4675 static int vxlan_netdevice_event(struct notifier_block *unused, 4676 unsigned long event, void *ptr) 4677 { 4678 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 4679 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id); 4680 4681 if (event == NETDEV_UNREGISTER) 4682 vxlan_handle_lowerdev_unregister(vn, dev); 4683 else if (event == NETDEV_UDP_TUNNEL_PUSH_INFO) 4684 vxlan_offload_rx_ports(dev, true); 4685 else if (event == NETDEV_UDP_TUNNEL_DROP_INFO) 4686 vxlan_offload_rx_ports(dev, false); 4687 4688 return NOTIFY_DONE; 4689 } 4690 4691 static struct notifier_block vxlan_notifier_block __read_mostly = { 4692 .notifier_call = vxlan_netdevice_event, 4693 }; 4694 4695 static void 4696 vxlan_fdb_offloaded_set(struct net_device *dev, 4697 struct switchdev_notifier_vxlan_fdb_info *fdb_info) 4698 { 4699 struct vxlan_dev *vxlan = netdev_priv(dev); 4700 struct vxlan_rdst *rdst; 4701 struct vxlan_fdb *f; 4702 u32 hash_index; 4703 4704 hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni); 4705 4706 spin_lock_bh(&vxlan->hash_lock[hash_index]); 4707 4708 f = vxlan_find_mac(vxlan, fdb_info->eth_addr, fdb_info->vni); 4709 if (!f) 4710 goto out; 4711 4712 rdst = vxlan_fdb_find_rdst(f, &fdb_info->remote_ip, 4713 fdb_info->remote_port, 4714 fdb_info->remote_vni, 4715 fdb_info->remote_ifindex); 4716 if (!rdst) 4717 goto out; 4718 4719 rdst->offloaded = fdb_info->offloaded; 4720 4721 out: 4722 spin_unlock_bh(&vxlan->hash_lock[hash_index]); 4723 } 4724 4725 static int 4726 vxlan_fdb_external_learn_add(struct net_device *dev, 4727 struct switchdev_notifier_vxlan_fdb_info *fdb_info) 4728 { 4729 struct vxlan_dev *vxlan = netdev_priv(dev); 4730 struct netlink_ext_ack *extack; 4731 u32 hash_index; 4732 int err; 4733 4734 hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni); 4735 extack = switchdev_notifier_info_to_extack(&fdb_info->info); 4736 4737 spin_lock_bh(&vxlan->hash_lock[hash_index]); 4738 err = vxlan_fdb_update(vxlan, fdb_info->eth_addr, &fdb_info->remote_ip, 4739 NUD_REACHABLE, 4740 NLM_F_CREATE | NLM_F_REPLACE, 4741 fdb_info->remote_port, 4742 fdb_info->vni, 4743 fdb_info->remote_vni, 4744 fdb_info->remote_ifindex, 4745 NTF_USE | NTF_SELF | NTF_EXT_LEARNED, 4746 0, false, extack); 4747 spin_unlock_bh(&vxlan->hash_lock[hash_index]); 4748 4749 return err; 4750 } 4751 4752 static int 4753 vxlan_fdb_external_learn_del(struct net_device *dev, 4754 struct switchdev_notifier_vxlan_fdb_info *fdb_info) 4755 { 4756 struct vxlan_dev *vxlan = netdev_priv(dev); 4757 struct vxlan_fdb *f; 4758 u32 hash_index; 4759 int err = 0; 4760 4761 hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni); 4762 spin_lock_bh(&vxlan->hash_lock[hash_index]); 4763 4764 f = vxlan_find_mac(vxlan, fdb_info->eth_addr, fdb_info->vni); 4765 if (!f) 4766 err = -ENOENT; 4767 else if (f->flags & NTF_EXT_LEARNED) 4768 err = __vxlan_fdb_delete(vxlan, fdb_info->eth_addr, 4769 fdb_info->remote_ip, 4770 fdb_info->remote_port, 4771 fdb_info->vni, 4772 fdb_info->remote_vni, 4773 fdb_info->remote_ifindex, 4774 false); 4775 4776 spin_unlock_bh(&vxlan->hash_lock[hash_index]); 4777 4778 return err; 4779 } 4780 4781 static int vxlan_switchdev_event(struct notifier_block *unused, 4782 unsigned long event, void *ptr) 4783 { 4784 struct net_device *dev = switchdev_notifier_info_to_dev(ptr); 4785 struct switchdev_notifier_vxlan_fdb_info *fdb_info; 4786 int err = 0; 4787 4788 switch (event) { 4789 case SWITCHDEV_VXLAN_FDB_OFFLOADED: 4790 vxlan_fdb_offloaded_set(dev, ptr); 4791 break; 4792 case SWITCHDEV_VXLAN_FDB_ADD_TO_BRIDGE: 4793 fdb_info = ptr; 4794 err = vxlan_fdb_external_learn_add(dev, fdb_info); 4795 if (err) { 4796 err = notifier_from_errno(err); 4797 break; 4798 } 4799 fdb_info->offloaded = true; 4800 vxlan_fdb_offloaded_set(dev, fdb_info); 4801 break; 4802 case SWITCHDEV_VXLAN_FDB_DEL_TO_BRIDGE: 4803 fdb_info = ptr; 4804 err = vxlan_fdb_external_learn_del(dev, fdb_info); 4805 if (err) { 4806 err = notifier_from_errno(err); 4807 break; 4808 } 4809 fdb_info->offloaded = false; 4810 vxlan_fdb_offloaded_set(dev, fdb_info); 4811 break; 4812 } 4813 4814 return err; 4815 } 4816 4817 static struct notifier_block vxlan_switchdev_notifier_block __read_mostly = { 4818 .notifier_call = vxlan_switchdev_event, 4819 }; 4820 4821 static void vxlan_fdb_nh_flush(struct nexthop *nh) 4822 { 4823 struct vxlan_fdb *fdb; 4824 struct vxlan_dev *vxlan; 4825 u32 hash_index; 4826 4827 rcu_read_lock(); 4828 list_for_each_entry_rcu(fdb, &nh->fdb_list, nh_list) { 4829 vxlan = rcu_dereference(fdb->vdev); 4830 WARN_ON(!vxlan); 4831 hash_index = fdb_head_index(vxlan, fdb->eth_addr, 4832 vxlan->default_dst.remote_vni); 4833 spin_lock_bh(&vxlan->hash_lock[hash_index]); 4834 if (!hlist_unhashed(&fdb->hlist)) 4835 vxlan_fdb_destroy(vxlan, fdb, false, false); 4836 spin_unlock_bh(&vxlan->hash_lock[hash_index]); 4837 } 4838 rcu_read_unlock(); 4839 } 4840 4841 static int vxlan_nexthop_event(struct notifier_block *nb, 4842 unsigned long event, void *ptr) 4843 { 4844 struct nh_notifier_info *info = ptr; 4845 struct nexthop *nh; 4846 4847 if (event != NEXTHOP_EVENT_DEL) 4848 return NOTIFY_DONE; 4849 4850 nh = nexthop_find_by_id(info->net, info->id); 4851 if (!nh) 4852 return NOTIFY_DONE; 4853 4854 vxlan_fdb_nh_flush(nh); 4855 4856 return NOTIFY_DONE; 4857 } 4858 4859 static __net_init int vxlan_init_net(struct net *net) 4860 { 4861 struct vxlan_net *vn = net_generic(net, vxlan_net_id); 4862 unsigned int h; 4863 4864 INIT_LIST_HEAD(&vn->vxlan_list); 4865 spin_lock_init(&vn->sock_lock); 4866 vn->nexthop_notifier_block.notifier_call = vxlan_nexthop_event; 4867 4868 for (h = 0; h < PORT_HASH_SIZE; ++h) 4869 INIT_HLIST_HEAD(&vn->sock_list[h]); 4870 4871 return register_nexthop_notifier(net, &vn->nexthop_notifier_block, 4872 NULL); 4873 } 4874 4875 static void __net_exit vxlan_destroy_tunnels(struct vxlan_net *vn, 4876 struct list_head *dev_to_kill) 4877 { 4878 struct vxlan_dev *vxlan, *next; 4879 4880 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) 4881 vxlan_dellink(vxlan->dev, dev_to_kill); 4882 } 4883 4884 static void __net_exit vxlan_exit_batch_rtnl(struct list_head *net_list, 4885 struct list_head *dev_to_kill) 4886 { 4887 struct net *net; 4888 4889 ASSERT_RTNL(); 4890 list_for_each_entry(net, net_list, exit_list) { 4891 struct vxlan_net *vn = net_generic(net, vxlan_net_id); 4892 4893 __unregister_nexthop_notifier(net, &vn->nexthop_notifier_block); 4894 4895 vxlan_destroy_tunnels(vn, dev_to_kill); 4896 } 4897 } 4898 4899 static void __net_exit vxlan_exit_net(struct net *net) 4900 { 4901 struct vxlan_net *vn = net_generic(net, vxlan_net_id); 4902 unsigned int h; 4903 4904 for (h = 0; h < PORT_HASH_SIZE; ++h) 4905 WARN_ON_ONCE(!hlist_empty(&vn->sock_list[h])); 4906 } 4907 4908 static struct pernet_operations vxlan_net_ops = { 4909 .init = vxlan_init_net, 4910 .exit_batch_rtnl = vxlan_exit_batch_rtnl, 4911 .exit = vxlan_exit_net, 4912 .id = &vxlan_net_id, 4913 .size = sizeof(struct vxlan_net), 4914 }; 4915 4916 static int __init vxlan_init_module(void) 4917 { 4918 int rc; 4919 4920 get_random_bytes(&vxlan_salt, sizeof(vxlan_salt)); 4921 4922 rc = register_pernet_subsys(&vxlan_net_ops); 4923 if (rc) 4924 goto out1; 4925 4926 rc = register_netdevice_notifier(&vxlan_notifier_block); 4927 if (rc) 4928 goto out2; 4929 4930 rc = register_switchdev_notifier(&vxlan_switchdev_notifier_block); 4931 if (rc) 4932 goto out3; 4933 4934 rc = rtnl_link_register(&vxlan_link_ops); 4935 if (rc) 4936 goto out4; 4937 4938 rc = vxlan_vnifilter_init(); 4939 if (rc) 4940 goto out5; 4941 4942 return 0; 4943 out5: 4944 rtnl_link_unregister(&vxlan_link_ops); 4945 out4: 4946 unregister_switchdev_notifier(&vxlan_switchdev_notifier_block); 4947 out3: 4948 unregister_netdevice_notifier(&vxlan_notifier_block); 4949 out2: 4950 unregister_pernet_subsys(&vxlan_net_ops); 4951 out1: 4952 return rc; 4953 } 4954 late_initcall(vxlan_init_module); 4955 4956 static void __exit vxlan_cleanup_module(void) 4957 { 4958 vxlan_vnifilter_uninit(); 4959 rtnl_link_unregister(&vxlan_link_ops); 4960 unregister_switchdev_notifier(&vxlan_switchdev_notifier_block); 4961 unregister_netdevice_notifier(&vxlan_notifier_block); 4962 unregister_pernet_subsys(&vxlan_net_ops); 4963 /* rcu_barrier() is called by netns */ 4964 } 4965 module_exit(vxlan_cleanup_module); 4966 4967 MODULE_LICENSE("GPL"); 4968 MODULE_VERSION(VXLAN_VERSION); 4969 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>"); 4970 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic"); 4971 MODULE_ALIAS_RTNL_LINK("vxlan"); 4972