1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * GRE over IPv6 protocol decoder. 4 * 5 * Authors: Dmitry Kozlov (xeb@mail.ru) 6 */ 7 8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 9 10 #include <linux/capability.h> 11 #include <linux/module.h> 12 #include <linux/types.h> 13 #include <linux/kernel.h> 14 #include <linux/slab.h> 15 #include <linux/uaccess.h> 16 #include <linux/skbuff.h> 17 #include <linux/netdevice.h> 18 #include <linux/in.h> 19 #include <linux/tcp.h> 20 #include <linux/udp.h> 21 #include <linux/if_arp.h> 22 #include <linux/init.h> 23 #include <linux/in6.h> 24 #include <linux/inetdevice.h> 25 #include <linux/igmp.h> 26 #include <linux/netfilter_ipv4.h> 27 #include <linux/etherdevice.h> 28 #include <linux/if_ether.h> 29 #include <linux/hash.h> 30 #include <linux/if_tunnel.h> 31 #include <linux/ip6_tunnel.h> 32 33 #include <net/sock.h> 34 #include <net/ip.h> 35 #include <net/ip_tunnels.h> 36 #include <net/icmp.h> 37 #include <net/protocol.h> 38 #include <net/addrconf.h> 39 #include <net/arp.h> 40 #include <net/checksum.h> 41 #include <net/dsfield.h> 42 #include <net/inet_ecn.h> 43 #include <net/xfrm.h> 44 #include <net/net_namespace.h> 45 #include <net/netns/generic.h> 46 #include <net/netdev_lock.h> 47 #include <net/rtnetlink.h> 48 49 #include <net/ipv6.h> 50 #include <net/ip6_fib.h> 51 #include <net/ip6_route.h> 52 #include <net/ip6_tunnel.h> 53 #include <net/gre.h> 54 #include <net/erspan.h> 55 #include <net/dst_metadata.h> 56 57 58 static bool log_ecn_error = true; 59 module_param(log_ecn_error, bool, 0644); 60 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); 61 62 #define IP6_GRE_HASH_SIZE_SHIFT 5 63 #define IP6_GRE_HASH_SIZE (1 << IP6_GRE_HASH_SIZE_SHIFT) 64 65 static unsigned int ip6gre_net_id __read_mostly; 66 struct ip6gre_net { 67 struct hlist_head tunnels[4][IP6_GRE_HASH_SIZE]; 68 struct mutex tunnels_lock; 69 70 struct ip6_tnl __rcu *collect_md_tun; 71 struct ip6_tnl __rcu *collect_md_tun_erspan; 72 struct net_device *fb_tunnel_dev; 73 }; 74 75 static struct rtnl_link_ops ip6gre_link_ops __read_mostly; 76 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly; 77 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly; 78 static int ip6gre_tunnel_init(struct net_device *dev); 79 static void ip6gre_tunnel_setup(struct net_device *dev); 80 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t); 81 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu); 82 static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu); 83 static void __ip6gre_dellink(struct net *net, struct net_device *dev, 84 struct list_head *head); 85 86 /* Tunnel hash table */ 87 88 /* 89 4 hash tables: 90 91 3: (remote,local) 92 2: (remote,*) 93 1: (*,local) 94 0: (*,*) 95 96 We require exact key match i.e. if a key is present in packet 97 it will match only tunnel with the same key; if it is not present, 98 it will match only keyless tunnel. 99 100 All keysless packets, if not matched configured keyless tunnels 101 will match fallback tunnel. 102 */ 103 104 #define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(IP6_GRE_HASH_SIZE - 1)) 105 static u32 HASH_ADDR(const struct in6_addr *addr) 106 { 107 u32 hash = ipv6_addr_hash(addr); 108 109 return hash_32(hash, IP6_GRE_HASH_SIZE_SHIFT); 110 } 111 112 #define tunnels_r_l tunnels[3] 113 #define tunnels_r tunnels[2] 114 #define tunnels_l tunnels[1] 115 #define tunnels_wc tunnels[0] 116 117 static bool ip6gre_tunnel_match(struct ip6_tnl *t, int dev_type, int link, 118 int *cand_score, struct ip6_tnl **ret) 119 { 120 int score = 0; 121 122 if (t->dev->type != ARPHRD_IP6GRE && 123 t->dev->type != dev_type) 124 return false; 125 126 if (t->parms.link != link) 127 score |= 1; 128 if (t->dev->type != dev_type) 129 score |= 2; 130 if (score == 0) { 131 *ret = t; 132 return true; 133 } 134 135 if (score < *cand_score) { 136 *ret = t; 137 *cand_score = score; 138 } 139 return false; 140 } 141 142 /* Given src, dst and key, find appropriate for input tunnel. */ 143 static struct ip6_tnl *ip6gre_tunnel_lookup(struct net_device *dev, 144 const struct in6_addr *remote, const struct in6_addr *local, 145 __be32 key, __be16 gre_proto) 146 { 147 int dev_type = (gre_proto == htons(ETH_P_TEB) || 148 gre_proto == htons(ETH_P_ERSPAN) || 149 gre_proto == htons(ETH_P_ERSPAN2)) ? 150 ARPHRD_ETHER : ARPHRD_IP6GRE; 151 unsigned int h0 = HASH_ADDR(remote); 152 unsigned int h1 = HASH_KEY(key); 153 struct ip6_tnl *t, *cand = NULL; 154 struct net *net = dev_net(dev); 155 struct net_device *ndev; 156 struct hlist_head *head; 157 int link = dev->ifindex; 158 struct ip6gre_net *ign; 159 int cand_score = 4; 160 161 ign = net_generic(net, ip6gre_net_id); 162 163 head = &ign->tunnels_r_l[h0 ^ h1]; 164 hlist_for_each_entry_rcu(t, head, hash_node) { 165 if (!ipv6_addr_equal(local, &t->parms.laddr) || 166 !ipv6_addr_equal(remote, &t->parms.raddr) || 167 key != t->parms.i_key || 168 !(t->dev->flags & IFF_UP)) 169 continue; 170 171 if (ip6gre_tunnel_match(t, dev_type, link, &cand_score, &cand)) 172 return cand; 173 } 174 175 head = &ign->tunnels_r[h0 ^ h1]; 176 hlist_for_each_entry_rcu(t, head, hash_node) { 177 if (!ipv6_addr_equal(remote, &t->parms.raddr) || 178 key != t->parms.i_key || 179 !(t->dev->flags & IFF_UP)) 180 continue; 181 182 if (ip6gre_tunnel_match(t, dev_type, link, &cand_score, &cand)) 183 return cand; 184 } 185 186 head = &ign->tunnels_l[h1]; 187 hlist_for_each_entry_rcu(t, head, hash_node) { 188 if ((!ipv6_addr_equal(local, &t->parms.laddr) && 189 (!ipv6_addr_equal(local, &t->parms.raddr) || 190 !ipv6_addr_is_multicast(local))) || 191 key != t->parms.i_key || 192 !(t->dev->flags & IFF_UP)) 193 continue; 194 195 if (ip6gre_tunnel_match(t, dev_type, link, &cand_score, &cand)) 196 return cand; 197 } 198 199 head = &ign->tunnels_wc[h1]; 200 hlist_for_each_entry_rcu(t, head, hash_node) { 201 if (t->parms.i_key != key || 202 !(t->dev->flags & IFF_UP)) 203 continue; 204 205 if (ip6gre_tunnel_match(t, dev_type, link, &cand_score, &cand)) 206 return cand; 207 } 208 209 if (cand) 210 return cand; 211 212 if (gre_proto == htons(ETH_P_ERSPAN) || 213 gre_proto == htons(ETH_P_ERSPAN2)) 214 t = rcu_dereference(ign->collect_md_tun_erspan); 215 else 216 t = rcu_dereference(ign->collect_md_tun); 217 218 if (t && t->dev->flags & IFF_UP) 219 return t; 220 221 ndev = READ_ONCE(ign->fb_tunnel_dev); 222 if (ndev && ndev->flags & IFF_UP) 223 return netdev_priv(ndev); 224 225 return NULL; 226 } 227 228 static struct hlist_head *__ip6gre_bucket(struct ip6gre_net *ign, 229 const struct __ip6_tnl_parm *p) 230 { 231 const struct in6_addr *remote = &p->raddr; 232 const struct in6_addr *local = &p->laddr; 233 unsigned int h = HASH_KEY(p->i_key); 234 int prio = 0; 235 236 if (!ipv6_addr_any(local)) 237 prio |= 1; 238 if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) { 239 prio |= 2; 240 h ^= HASH_ADDR(remote); 241 } 242 243 return &ign->tunnels[prio][h]; 244 } 245 246 static void ip6gre_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t) 247 { 248 if (t->parms.collect_md) 249 rcu_assign_pointer(ign->collect_md_tun, t); 250 } 251 252 static void ip6erspan_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t) 253 { 254 if (t->parms.collect_md) 255 rcu_assign_pointer(ign->collect_md_tun_erspan, t); 256 } 257 258 static void ip6gre_tunnel_unlink_md(struct ip6gre_net *ign, struct ip6_tnl *t) 259 { 260 if (t->parms.collect_md) 261 rcu_assign_pointer(ign->collect_md_tun, NULL); 262 } 263 264 static void ip6erspan_tunnel_unlink_md(struct ip6gre_net *ign, 265 struct ip6_tnl *t) 266 { 267 if (t->parms.collect_md) 268 rcu_assign_pointer(ign->collect_md_tun_erspan, NULL); 269 } 270 271 static inline struct hlist_head *ip6gre_bucket(struct ip6gre_net *ign, 272 const struct ip6_tnl *t) 273 { 274 return __ip6gre_bucket(ign, &t->parms); 275 } 276 277 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t) 278 { 279 struct hlist_head *head = ip6gre_bucket(ign, t); 280 281 hlist_add_head_rcu(&t->hash_node, head); 282 } 283 284 static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t) 285 { 286 hlist_del_init_rcu(&t->hash_node); 287 } 288 289 static bool ip6gre_tunnel_unregistering(struct ip6_tnl *t) 290 { 291 return hlist_unhashed(&t->hash_node); 292 } 293 294 static struct ip6_tnl *ip6gre_tunnel_find(struct net *net, 295 const struct __ip6_tnl_parm *parms, 296 int type) 297 { 298 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 299 const struct in6_addr *remote = &parms->raddr; 300 const struct in6_addr *local = &parms->laddr; 301 __be32 key = parms->i_key; 302 struct hlist_head *head; 303 int link = parms->link; 304 struct ip6_tnl *t; 305 306 head = __ip6gre_bucket(ign, parms); 307 308 hlist_for_each_entry(t, head, hash_node) { 309 if (ipv6_addr_equal(local, &t->parms.laddr) && 310 ipv6_addr_equal(remote, &t->parms.raddr) && 311 key == t->parms.i_key && 312 link == t->parms.link && 313 type == t->dev->type) 314 break; 315 } 316 317 return t; 318 } 319 320 static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net, 321 const struct __ip6_tnl_parm *parms, int create) 322 { 323 struct ip6_tnl *t, *nt; 324 struct net_device *dev; 325 char name[IFNAMSIZ]; 326 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 327 328 t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE); 329 if (t && create) 330 return NULL; 331 if (t || !create) 332 return t; 333 334 if (parms->name[0]) { 335 if (!dev_valid_name(parms->name)) 336 return NULL; 337 strscpy(name, parms->name); 338 } else { 339 strscpy(name, "ip6gre%d"); 340 } 341 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, 342 ip6gre_tunnel_setup); 343 if (!dev) 344 return NULL; 345 346 dev_net_set(dev, net); 347 348 nt = netdev_priv(dev); 349 nt->parms = *parms; 350 dev->rtnl_link_ops = &ip6gre_link_ops; 351 352 nt->dev = dev; 353 nt->net = dev_net(dev); 354 355 if (register_netdevice(dev) < 0) 356 goto failed_free; 357 358 ip6gre_tnl_link_config(nt, 1); 359 ip6gre_tunnel_link(ign, nt); 360 return nt; 361 362 failed_free: 363 free_netdev(dev); 364 return NULL; 365 } 366 367 static void ip6erspan_tunnel_uninit(struct net_device *dev) 368 { 369 struct ip6_tnl *t = netdev_priv(dev); 370 371 dst_cache_reset(&t->dst_cache); 372 netdev_put(dev, &t->dev_tracker); 373 } 374 375 static void ip6gre_tunnel_uninit(struct net_device *dev) 376 { 377 struct ip6_tnl *t = netdev_priv(dev); 378 379 dst_cache_reset(&t->dst_cache); 380 netdev_put(dev, &t->dev_tracker); 381 } 382 383 384 static int ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 385 u8 type, u8 code, int offset, __be32 info) 386 { 387 struct net *net = dev_net(skb->dev); 388 const struct ipv6hdr *ipv6h; 389 struct tnl_ptk_info tpi; 390 struct ip6_tnl *t; 391 392 if (gre_parse_header(skb, &tpi, NULL, htons(ETH_P_IPV6), 393 offset) < 0) 394 return -EINVAL; 395 396 ipv6h = (const struct ipv6hdr *)skb->data; 397 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr, 398 tpi.key, tpi.proto); 399 if (!t) 400 return -ENOENT; 401 402 switch (type) { 403 case ICMPV6_DEST_UNREACH: 404 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n", 405 t->parms.name); 406 if (code != ICMPV6_PORT_UNREACH) 407 break; 408 return 0; 409 case ICMPV6_TIME_EXCEED: 410 if (code == ICMPV6_EXC_HOPLIMIT) { 411 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n", 412 t->parms.name); 413 break; 414 } 415 return 0; 416 case ICMPV6_PARAMPROB: { 417 struct ipv6_tlv_tnl_enc_lim *tel; 418 __u32 teli; 419 420 teli = 0; 421 if (code == ICMPV6_HDR_FIELD) 422 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data); 423 424 if (teli && teli == be32_to_cpu(info) - 2) { 425 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli]; 426 if (tel->encap_limit == 0) { 427 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n", 428 t->parms.name); 429 } 430 } else { 431 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n", 432 t->parms.name); 433 } 434 return 0; 435 } 436 case ICMPV6_PKT_TOOBIG: 437 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL)); 438 return 0; 439 case NDISC_REDIRECT: 440 ip6_redirect(skb, net, skb->dev->ifindex, 0, 441 sock_net_uid(net, NULL)); 442 return 0; 443 } 444 445 if (time_before(jiffies, READ_ONCE(t->err_time) + IP6TUNNEL_ERR_TIMEO)) 446 WRITE_ONCE(t->err_count, READ_ONCE(t->err_count) + 1); 447 else 448 WRITE_ONCE(t->err_count, 1); 449 WRITE_ONCE(t->err_time, jiffies); 450 451 return 0; 452 } 453 454 static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi) 455 { 456 const struct ipv6hdr *ipv6h; 457 struct ip6_tnl *tunnel; 458 459 ipv6h = ipv6_hdr(skb); 460 tunnel = ip6gre_tunnel_lookup(skb->dev, 461 &ipv6h->saddr, &ipv6h->daddr, tpi->key, 462 tpi->proto); 463 if (tunnel) { 464 if (tunnel->parms.collect_md) { 465 IP_TUNNEL_DECLARE_FLAGS(flags); 466 struct metadata_dst *tun_dst; 467 __be64 tun_id; 468 469 ip_tunnel_flags_copy(flags, tpi->flags); 470 tun_id = key32_to_tunnel_id(tpi->key); 471 472 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id, 0); 473 if (!tun_dst) 474 return PACKET_REJECT; 475 476 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error); 477 } else { 478 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error); 479 } 480 481 return PACKET_RCVD; 482 } 483 484 return PACKET_REJECT; 485 } 486 487 static int ip6erspan_rcv(struct sk_buff *skb, 488 struct tnl_ptk_info *tpi, 489 int gre_hdr_len) 490 { 491 struct erspan_base_hdr *ershdr; 492 const struct ipv6hdr *ipv6h; 493 struct erspan_md2 *md2; 494 struct ip6_tnl *tunnel; 495 u8 ver; 496 497 if (unlikely(!pskb_may_pull(skb, sizeof(*ershdr)))) 498 return PACKET_REJECT; 499 500 ipv6h = ipv6_hdr(skb); 501 ershdr = (struct erspan_base_hdr *)skb->data; 502 ver = ershdr->ver; 503 504 tunnel = ip6gre_tunnel_lookup(skb->dev, 505 &ipv6h->saddr, &ipv6h->daddr, tpi->key, 506 tpi->proto); 507 if (tunnel) { 508 int len = erspan_hdr_len(ver); 509 510 if (unlikely(!pskb_may_pull(skb, len))) 511 return PACKET_REJECT; 512 513 if (__iptunnel_pull_header(skb, len, 514 htons(ETH_P_TEB), 515 false, false)) 516 return PACKET_REJECT; 517 518 if (tunnel->parms.collect_md) { 519 struct erspan_metadata *pkt_md, *md; 520 IP_TUNNEL_DECLARE_FLAGS(flags); 521 struct metadata_dst *tun_dst; 522 struct ip_tunnel_info *info; 523 unsigned char *gh; 524 __be64 tun_id; 525 526 __set_bit(IP_TUNNEL_KEY_BIT, tpi->flags); 527 ip_tunnel_flags_copy(flags, tpi->flags); 528 tun_id = key32_to_tunnel_id(tpi->key); 529 530 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id, 531 sizeof(*md)); 532 if (!tun_dst) 533 return PACKET_REJECT; 534 535 /* MUST set options_len before referencing options */ 536 info = &tun_dst->u.tun_info; 537 info->options_len = sizeof(*md); 538 539 /* skb can be uncloned in __iptunnel_pull_header, so 540 * old pkt_md is no longer valid and we need to reset 541 * it 542 */ 543 gh = skb_network_header(skb) + 544 skb_network_header_len(skb); 545 pkt_md = (struct erspan_metadata *)(gh + gre_hdr_len + 546 sizeof(*ershdr)); 547 md = ip_tunnel_info_opts(info); 548 md->version = ver; 549 md2 = &md->u.md2; 550 memcpy(md2, pkt_md, ver == 1 ? ERSPAN_V1_MDSIZE : 551 ERSPAN_V2_MDSIZE); 552 __set_bit(IP_TUNNEL_ERSPAN_OPT_BIT, 553 info->key.tun_flags); 554 555 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error); 556 557 } else { 558 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error); 559 } 560 561 return PACKET_RCVD; 562 } 563 564 return PACKET_REJECT; 565 } 566 567 static int gre_rcv(struct sk_buff *skb) 568 { 569 struct tnl_ptk_info tpi; 570 bool csum_err = false; 571 int hdr_len; 572 573 hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0); 574 if (hdr_len < 0) 575 goto drop; 576 577 if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false)) 578 goto drop; 579 580 if (unlikely(tpi.proto == htons(ETH_P_ERSPAN) || 581 tpi.proto == htons(ETH_P_ERSPAN2))) { 582 if (ip6erspan_rcv(skb, &tpi, hdr_len) == PACKET_RCVD) 583 return 0; 584 goto out; 585 } 586 587 if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD) 588 return 0; 589 590 out: 591 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); 592 drop: 593 dev_core_stats_rx_dropped_inc(skb->dev); 594 kfree_skb(skb); 595 return 0; 596 } 597 598 static int gre_handle_offloads(struct sk_buff *skb, bool csum) 599 { 600 return iptunnel_handle_offloads(skb, 601 csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE); 602 } 603 604 static void prepare_ip6gre_xmit_ipv4(struct sk_buff *skb, 605 struct net_device *dev, 606 struct flowi6 *fl6, __u8 *dsfield, 607 int *encap_limit) 608 { 609 const struct iphdr *iph = ip_hdr(skb); 610 struct ip6_tnl *t = netdev_priv(dev); 611 612 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 613 *encap_limit = t->parms.encap_limit; 614 615 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6)); 616 617 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) 618 *dsfield = ipv4_get_dsfield(iph); 619 else 620 *dsfield = ip6_tclass(t->parms.flowinfo); 621 622 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) 623 fl6->flowi6_mark = skb->mark; 624 else 625 fl6->flowi6_mark = t->parms.fwmark; 626 627 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL); 628 } 629 630 static int prepare_ip6gre_xmit_ipv6(struct sk_buff *skb, 631 struct net_device *dev, 632 struct flowi6 *fl6, __u8 *dsfield, 633 int *encap_limit) 634 { 635 struct ipv6hdr *ipv6h; 636 struct ip6_tnl *t = netdev_priv(dev); 637 __u16 offset; 638 639 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb)); 640 /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */ 641 ipv6h = ipv6_hdr(skb); 642 643 if (offset > 0) { 644 struct ipv6_tlv_tnl_enc_lim *tel; 645 646 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset]; 647 if (tel->encap_limit == 0) { 648 icmpv6_ndo_send(skb, ICMPV6_PARAMPROB, 649 ICMPV6_HDR_FIELD, offset + 2); 650 return -1; 651 } 652 *encap_limit = tel->encap_limit - 1; 653 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) { 654 *encap_limit = t->parms.encap_limit; 655 } 656 657 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6)); 658 659 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) 660 *dsfield = ipv6_get_dsfield(ipv6h); 661 else 662 *dsfield = ip6_tclass(t->parms.flowinfo); 663 664 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL) 665 fl6->flowlabel |= ip6_flowlabel(ipv6h); 666 667 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) 668 fl6->flowi6_mark = skb->mark; 669 else 670 fl6->flowi6_mark = t->parms.fwmark; 671 672 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL); 673 674 return 0; 675 } 676 677 static int prepare_ip6gre_xmit_other(struct sk_buff *skb, 678 struct net_device *dev, 679 struct flowi6 *fl6, __u8 *dsfield, 680 int *encap_limit) 681 { 682 struct ip6_tnl *t = netdev_priv(dev); 683 684 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 685 *encap_limit = t->parms.encap_limit; 686 687 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6)); 688 689 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) 690 *dsfield = 0; 691 else 692 *dsfield = ip6_tclass(t->parms.flowinfo); 693 694 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) 695 fl6->flowi6_mark = skb->mark; 696 else 697 fl6->flowi6_mark = t->parms.fwmark; 698 699 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL); 700 701 return 0; 702 } 703 704 static struct ip_tunnel_info *skb_tunnel_info_txcheck(struct sk_buff *skb) 705 { 706 struct ip_tunnel_info *tun_info; 707 708 tun_info = skb_tunnel_info(skb); 709 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX))) 710 return ERR_PTR(-EINVAL); 711 712 return tun_info; 713 } 714 715 static netdev_tx_t __gre6_xmit(struct sk_buff *skb, 716 struct net_device *dev, __u8 dsfield, 717 struct flowi6 *fl6, int encap_limit, 718 __u32 *pmtu, __be16 proto) 719 { 720 struct ip6_tnl *tunnel = netdev_priv(dev); 721 IP_TUNNEL_DECLARE_FLAGS(flags); 722 __be16 protocol; 723 724 if (dev->type == ARPHRD_ETHER) 725 IPCB(skb)->flags = 0; 726 727 if (dev->header_ops && dev->type == ARPHRD_IP6GRE) 728 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr; 729 else 730 fl6->daddr = tunnel->parms.raddr; 731 732 /* Push GRE header. */ 733 protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto; 734 735 if (tunnel->parms.collect_md) { 736 struct ip_tunnel_info *tun_info; 737 const struct ip_tunnel_key *key; 738 int tun_hlen; 739 740 tun_info = skb_tunnel_info_txcheck(skb); 741 if (IS_ERR(tun_info) || 742 unlikely(ip_tunnel_info_af(tun_info) != AF_INET6)) 743 return -EINVAL; 744 745 key = &tun_info->key; 746 memset(fl6, 0, sizeof(*fl6)); 747 fl6->flowi6_proto = IPPROTO_GRE; 748 fl6->daddr = key->u.ipv6.dst; 749 fl6->flowlabel = key->label; 750 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL); 751 fl6->fl6_gre_key = tunnel_id_to_key32(key->tun_id); 752 753 dsfield = key->tos; 754 ip_tunnel_flags_zero(flags); 755 __set_bit(IP_TUNNEL_CSUM_BIT, flags); 756 __set_bit(IP_TUNNEL_KEY_BIT, flags); 757 __set_bit(IP_TUNNEL_SEQ_BIT, flags); 758 ip_tunnel_flags_and(flags, flags, key->tun_flags); 759 tun_hlen = gre_calc_hlen(flags); 760 761 if (skb_cow_head(skb, dev->needed_headroom ?: tun_hlen + tunnel->encap_hlen)) 762 return -ENOMEM; 763 764 gre_build_header(skb, tun_hlen, 765 flags, protocol, 766 tunnel_id_to_key32(tun_info->key.tun_id), 767 test_bit(IP_TUNNEL_SEQ_BIT, flags) ? 768 htonl(atomic_fetch_inc(&tunnel->o_seqno)) : 769 0); 770 771 } else { 772 if (skb_cow_head(skb, dev->needed_headroom ?: tunnel->hlen)) 773 return -ENOMEM; 774 775 ip_tunnel_flags_copy(flags, tunnel->parms.o_flags); 776 777 gre_build_header(skb, tunnel->tun_hlen, flags, 778 protocol, tunnel->parms.o_key, 779 test_bit(IP_TUNNEL_SEQ_BIT, flags) ? 780 htonl(atomic_fetch_inc(&tunnel->o_seqno)) : 781 0); 782 } 783 784 return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu, 785 NEXTHDR_GRE); 786 } 787 788 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev) 789 { 790 struct ip6_tnl *t = netdev_priv(dev); 791 int encap_limit = -1; 792 struct flowi6 fl6; 793 __u8 dsfield = 0; 794 __u32 mtu; 795 int err; 796 797 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); 798 799 if (!t->parms.collect_md) 800 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6, 801 &dsfield, &encap_limit); 802 803 err = gre_handle_offloads(skb, test_bit(IP_TUNNEL_CSUM_BIT, 804 t->parms.o_flags)); 805 if (err) 806 return -1; 807 808 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, 809 skb->protocol); 810 if (err != 0) { 811 /* XXX: send ICMP error even if DF is not set. */ 812 if (err == -EMSGSIZE) 813 icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, 814 htonl(mtu)); 815 return -1; 816 } 817 818 return 0; 819 } 820 821 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev) 822 { 823 struct ip6_tnl *t = netdev_priv(dev); 824 struct ipv6hdr *ipv6h = ipv6_hdr(skb); 825 int encap_limit = -1; 826 struct flowi6 fl6; 827 __u8 dsfield = 0; 828 __u32 mtu; 829 int err; 830 831 /* The outer destination of a collect_md tunnel comes from the 832 * metadata, so raddr is not its exit point, and hosts on the link 833 * bridged into an L2 one do send from :: (DAD, early MLD). 834 */ 835 if (!(t->parms.collect_md && dev->type == ARPHRD_ETHER) && 836 ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr)) 837 return -1; 838 839 if (!t->parms.collect_md && 840 prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, &dsfield, &encap_limit)) 841 return -1; 842 843 if (gre_handle_offloads(skb, test_bit(IP_TUNNEL_CSUM_BIT, 844 t->parms.o_flags))) 845 return -1; 846 847 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, 848 &mtu, skb->protocol); 849 if (err != 0) { 850 if (err == -EMSGSIZE) 851 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 852 return -1; 853 } 854 855 return 0; 856 } 857 858 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev) 859 { 860 struct ip6_tnl *t = netdev_priv(dev); 861 int encap_limit = -1; 862 struct flowi6 fl6; 863 __u8 dsfield = 0; 864 __u32 mtu; 865 int err; 866 867 if (!t->parms.collect_md && 868 prepare_ip6gre_xmit_other(skb, dev, &fl6, &dsfield, &encap_limit)) 869 return -1; 870 871 err = gre_handle_offloads(skb, test_bit(IP_TUNNEL_CSUM_BIT, 872 t->parms.o_flags)); 873 if (err) 874 return err; 875 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, skb->protocol); 876 877 return err; 878 } 879 880 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb, 881 struct net_device *dev) 882 { 883 struct ip_tunnel_info *tun_info = NULL; 884 struct ip6_tnl *t = netdev_priv(dev); 885 __be16 payload_protocol; 886 int ret; 887 888 if (!pskb_inet_may_pull(skb)) 889 goto tx_err; 890 891 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr)) 892 goto tx_err; 893 894 if (t->parms.collect_md) 895 tun_info = skb_tunnel_info_txcheck(skb); 896 897 payload_protocol = skb_protocol(skb, true); 898 switch (payload_protocol) { 899 case htons(ETH_P_IP): 900 ret = ip6gre_xmit_ipv4(skb, dev); 901 break; 902 case htons(ETH_P_IPV6): 903 ret = ip6gre_xmit_ipv6(skb, dev); 904 break; 905 default: 906 ret = ip6gre_xmit_other(skb, dev); 907 break; 908 } 909 910 if (ret < 0) 911 goto tx_err; 912 913 return NETDEV_TX_OK; 914 915 tx_err: 916 if (!IS_ERR(tun_info)) 917 DEV_STATS_INC(dev, tx_errors); 918 DEV_STATS_INC(dev, tx_dropped); 919 kfree_skb(skb); 920 return NETDEV_TX_OK; 921 } 922 923 static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb, 924 struct net_device *dev) 925 { 926 struct ip_tunnel_info *tun_info = NULL; 927 struct ip6_tnl *t = netdev_priv(dev); 928 IP_TUNNEL_DECLARE_FLAGS(flags) = { }; 929 bool truncate = false; 930 int encap_limit = -1; 931 __u8 dsfield = false; 932 struct flowi6 fl6; 933 int err = -EINVAL; 934 __be16 proto; 935 __u32 mtu; 936 int nhoff; 937 938 if (!pskb_inet_may_pull(skb)) 939 goto tx_err; 940 941 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr)) 942 goto tx_err; 943 944 if (gre_handle_offloads(skb, false)) 945 goto tx_err; 946 947 if (skb->len > dev->mtu + dev->hard_header_len) { 948 if (pskb_trim(skb, dev->mtu + dev->hard_header_len)) 949 goto tx_err; 950 truncate = true; 951 } 952 953 nhoff = skb_network_offset(skb); 954 if (skb->protocol == htons(ETH_P_IP) && 955 (ntohs(ip_hdr(skb)->tot_len) > skb->len - nhoff)) 956 truncate = true; 957 958 if (skb->protocol == htons(ETH_P_IPV6)) { 959 int thoff; 960 961 if (skb_transport_header_was_set(skb)) 962 thoff = skb_transport_offset(skb); 963 else 964 thoff = nhoff + sizeof(struct ipv6hdr); 965 if (ntohs(ipv6_hdr(skb)->payload_len) > skb->len - thoff) 966 truncate = true; 967 } 968 969 if (skb_cow_head(skb, dev->needed_headroom ?: t->hlen)) 970 goto tx_err; 971 972 IPCB(skb)->flags = 0; 973 974 /* For collect_md mode, derive fl6 from the tunnel key, 975 * for native mode, call prepare_ip6gre_xmit_{ipv4,ipv6}. 976 */ 977 if (t->parms.collect_md) { 978 const struct ip_tunnel_key *key; 979 struct erspan_metadata *md; 980 __be32 tun_id; 981 982 tun_info = skb_tunnel_info_txcheck(skb); 983 if (IS_ERR(tun_info) || 984 unlikely(ip_tunnel_info_af(tun_info) != AF_INET6)) 985 goto tx_err; 986 987 key = &tun_info->key; 988 memset(&fl6, 0, sizeof(fl6)); 989 fl6.flowi6_proto = IPPROTO_GRE; 990 fl6.daddr = key->u.ipv6.dst; 991 fl6.flowlabel = key->label; 992 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL); 993 fl6.fl6_gre_key = tunnel_id_to_key32(key->tun_id); 994 995 dsfield = key->tos; 996 if (!test_bit(IP_TUNNEL_ERSPAN_OPT_BIT, 997 tun_info->key.tun_flags)) 998 goto tx_err; 999 if (tun_info->options_len < sizeof(*md)) 1000 goto tx_err; 1001 md = ip_tunnel_info_opts(tun_info); 1002 1003 tun_id = tunnel_id_to_key32(key->tun_id); 1004 if (md->version == 1) { 1005 erspan_build_header(skb, 1006 ntohl(tun_id), 1007 ntohl(md->u.index), truncate, 1008 false); 1009 proto = htons(ETH_P_ERSPAN); 1010 } else if (md->version == 2) { 1011 erspan_build_header_v2(skb, 1012 ntohl(tun_id), 1013 md->u.md2.dir, 1014 get_hwid(&md->u.md2), 1015 truncate, false); 1016 proto = htons(ETH_P_ERSPAN2); 1017 } else { 1018 goto tx_err; 1019 } 1020 } else { 1021 switch (skb->protocol) { 1022 case htons(ETH_P_IP): 1023 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); 1024 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6, 1025 &dsfield, &encap_limit); 1026 break; 1027 case htons(ETH_P_IPV6): 1028 if (ipv6_addr_equal(&t->parms.raddr, &ipv6_hdr(skb)->saddr)) 1029 goto tx_err; 1030 if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, 1031 &dsfield, &encap_limit)) 1032 goto tx_err; 1033 break; 1034 default: 1035 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); 1036 break; 1037 } 1038 1039 if (t->parms.erspan_ver == 1) { 1040 erspan_build_header(skb, ntohl(t->parms.o_key), 1041 t->parms.index, 1042 truncate, false); 1043 proto = htons(ETH_P_ERSPAN); 1044 } else if (t->parms.erspan_ver == 2) { 1045 erspan_build_header_v2(skb, ntohl(t->parms.o_key), 1046 t->parms.dir, 1047 t->parms.hwid, 1048 truncate, false); 1049 proto = htons(ETH_P_ERSPAN2); 1050 } else { 1051 goto tx_err; 1052 } 1053 1054 fl6.daddr = t->parms.raddr; 1055 } 1056 1057 /* Push GRE header. */ 1058 __set_bit(IP_TUNNEL_SEQ_BIT, flags); 1059 gre_build_header(skb, 8, flags, proto, 0, 1060 htonl(atomic_fetch_inc(&t->o_seqno))); 1061 1062 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, 1063 NEXTHDR_GRE); 1064 if (err != 0) { 1065 /* XXX: send ICMP error even if DF is not set. */ 1066 if (err == -EMSGSIZE) { 1067 if (skb->protocol == htons(ETH_P_IP)) 1068 icmp_ndo_send(skb, ICMP_DEST_UNREACH, 1069 ICMP_FRAG_NEEDED, htonl(mtu)); 1070 else 1071 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 1072 } 1073 1074 goto tx_err; 1075 } 1076 return NETDEV_TX_OK; 1077 1078 tx_err: 1079 if (!IS_ERR(tun_info)) 1080 DEV_STATS_INC(dev, tx_errors); 1081 DEV_STATS_INC(dev, tx_dropped); 1082 kfree_skb(skb); 1083 return NETDEV_TX_OK; 1084 } 1085 1086 static void ip6gre_tnl_link_config_common(struct ip6_tnl *t) 1087 { 1088 struct net_device *dev = t->dev; 1089 struct __ip6_tnl_parm *p = &t->parms; 1090 struct flowi6 *fl6 = &t->fl.u.ip6; 1091 1092 if (dev->type != ARPHRD_ETHER) { 1093 __dev_addr_set(dev, &p->laddr, sizeof(struct in6_addr)); 1094 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); 1095 } 1096 1097 /* Set up flowi template */ 1098 fl6->saddr = p->laddr; 1099 fl6->daddr = p->raddr; 1100 fl6->flowi6_oif = p->link; 1101 fl6->flowlabel = 0; 1102 fl6->flowi6_proto = IPPROTO_GRE; 1103 fl6->fl6_gre_key = t->parms.o_key; 1104 1105 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) 1106 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; 1107 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) 1108 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; 1109 1110 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET); 1111 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr); 1112 1113 if (p->flags&IP6_TNL_F_CAP_XMIT && 1114 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER) 1115 dev->flags |= IFF_POINTOPOINT; 1116 else 1117 dev->flags &= ~IFF_POINTOPOINT; 1118 } 1119 1120 static void ip6gre_tnl_link_config_route(struct ip6_tnl *t, int set_mtu, 1121 int t_hlen) 1122 { 1123 const struct __ip6_tnl_parm *p = &t->parms; 1124 struct net_device *dev = t->dev; 1125 1126 if (p->flags & IP6_TNL_F_CAP_XMIT) { 1127 int strict = (ipv6_addr_type(&p->raddr) & 1128 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); 1129 1130 struct rt6_info *rt = rt6_lookup(t->net, 1131 &p->raddr, &p->laddr, 1132 p->link, NULL, strict); 1133 1134 if (!rt) 1135 return; 1136 1137 if (rt->dst.dev) { 1138 unsigned int headroom; 1139 1140 headroom = rt->dst.dev->hard_header_len + t_hlen; 1141 headroom = ip_tunnel_limit_headroom(headroom); 1142 dev->needed_headroom = headroom; 1143 1144 if (set_mtu) { 1145 int mtu = rt->dst.dev->mtu - t_hlen; 1146 1147 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1148 mtu -= 8; 1149 if (dev->type == ARPHRD_ETHER) 1150 mtu -= ETH_HLEN; 1151 1152 if (mtu < IPV6_MIN_MTU) 1153 mtu = IPV6_MIN_MTU; 1154 WRITE_ONCE(dev->mtu, mtu); 1155 } 1156 } 1157 ip6_rt_put(rt); 1158 } 1159 } 1160 1161 static int ip6gre_calc_hlen(struct ip6_tnl *tunnel) 1162 { 1163 int t_hlen; 1164 1165 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags); 1166 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen; 1167 1168 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr); 1169 1170 if (tunnel->dev->header_ops && tunnel->dev->type == ARPHRD_IP6GRE) 1171 tunnel->dev->hard_header_len = t_hlen; 1172 else 1173 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen; 1174 1175 return t_hlen; 1176 } 1177 1178 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu) 1179 { 1180 ip6gre_tnl_link_config_common(t); 1181 ip6gre_tnl_link_config_route(t, set_mtu, ip6gre_calc_hlen(t)); 1182 } 1183 1184 static void ip6gre_tnl_copy_tnl_parm(struct ip6_tnl *t, 1185 const struct __ip6_tnl_parm *p) 1186 { 1187 t->parms.laddr = p->laddr; 1188 t->parms.raddr = p->raddr; 1189 t->parms.flags = p->flags; 1190 t->parms.hop_limit = p->hop_limit; 1191 t->parms.encap_limit = p->encap_limit; 1192 t->parms.flowinfo = p->flowinfo; 1193 t->parms.link = p->link; 1194 t->parms.proto = p->proto; 1195 t->parms.i_key = p->i_key; 1196 t->parms.o_key = p->o_key; 1197 ip_tunnel_flags_copy(t->parms.i_flags, p->i_flags); 1198 ip_tunnel_flags_copy(t->parms.o_flags, p->o_flags); 1199 t->parms.fwmark = p->fwmark; 1200 t->parms.erspan_ver = p->erspan_ver; 1201 t->parms.index = p->index; 1202 t->parms.dir = p->dir; 1203 t->parms.hwid = p->hwid; 1204 dst_cache_reset(&t->dst_cache); 1205 } 1206 1207 static int ip6gre_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p, 1208 int set_mtu) 1209 { 1210 ip6gre_tnl_copy_tnl_parm(t, p); 1211 ip6gre_tnl_link_config(t, set_mtu); 1212 return 0; 1213 } 1214 1215 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p, 1216 const struct ip6_tnl_parm2 *u) 1217 { 1218 p->laddr = u->laddr; 1219 p->raddr = u->raddr; 1220 p->flags = u->flags; 1221 p->hop_limit = u->hop_limit; 1222 p->encap_limit = u->encap_limit; 1223 p->flowinfo = u->flowinfo; 1224 p->link = u->link; 1225 p->i_key = u->i_key; 1226 p->o_key = u->o_key; 1227 gre_flags_to_tnl_flags(p->i_flags, u->i_flags); 1228 gre_flags_to_tnl_flags(p->o_flags, u->o_flags); 1229 memcpy(p->name, u->name, sizeof(u->name)); 1230 } 1231 1232 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u, 1233 const struct __ip6_tnl_parm *p) 1234 { 1235 u->proto = IPPROTO_GRE; 1236 u->laddr = p->laddr; 1237 u->raddr = p->raddr; 1238 u->flags = p->flags; 1239 u->hop_limit = p->hop_limit; 1240 u->encap_limit = p->encap_limit; 1241 u->flowinfo = p->flowinfo; 1242 u->link = p->link; 1243 u->i_key = p->i_key; 1244 u->o_key = p->o_key; 1245 u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags); 1246 u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags); 1247 memcpy(u->name, p->name, sizeof(u->name)); 1248 } 1249 1250 static int ip6gre_tunnel_siocdevprivate(struct net_device *dev, 1251 struct ifreq *ifr, void __user *data, 1252 int cmd) 1253 { 1254 struct ip6_tnl *t = netdev_priv(dev); 1255 struct net *orig_net = dev_net(dev); 1256 struct __ip6_tnl_parm p1 = {}; 1257 LIST_HEAD(dev_kill_list); 1258 struct net *net = t->net; 1259 struct ip6_tnl_parm2 p; 1260 struct ip6gre_net *ign; 1261 int err = 0; 1262 1263 DEBUG_NET_WARN_ON_ONCE(netdev_need_ops_lock(dev)); 1264 1265 ign = net_generic(net, ip6gre_net_id); 1266 1267 mutex_lock(&ign->tunnels_lock); 1268 1269 if (!check_net(net)) { 1270 err = -EBUSY; 1271 goto done; 1272 } 1273 1274 switch (cmd) { 1275 case SIOCGETTUNNEL: 1276 if (dev == ign->fb_tunnel_dev) { 1277 if (copy_from_user(&p, data, sizeof(p))) { 1278 err = -EFAULT; 1279 break; 1280 } 1281 ip6gre_tnl_parm_from_user(&p1, &p); 1282 t = ip6gre_tunnel_locate(net, &p1, 0); 1283 if (!t) 1284 t = netdev_priv(dev); 1285 } 1286 memset(&p, 0, sizeof(p)); 1287 ip6gre_tnl_parm_to_user(&p, &t->parms); 1288 if (copy_to_user(data, &p, sizeof(p))) 1289 err = -EFAULT; 1290 break; 1291 1292 case SIOCADDTUNNEL: 1293 case SIOCCHGTUNNEL: 1294 err = -EPERM; 1295 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1296 goto done; 1297 1298 err = -EFAULT; 1299 if (copy_from_user(&p, data, sizeof(p))) 1300 goto done; 1301 1302 err = -EINVAL; 1303 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING)) 1304 goto done; 1305 1306 if (!(p.i_flags&GRE_KEY)) 1307 p.i_key = 0; 1308 if (!(p.o_flags&GRE_KEY)) 1309 p.o_key = 0; 1310 1311 ip6gre_tnl_parm_from_user(&p1, &p); 1312 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL); 1313 1314 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { 1315 if (t && !ip6gre_tunnel_unregistering(t)) { 1316 if (t->dev != dev) { 1317 err = -EEXIST; 1318 break; 1319 } 1320 } else { 1321 t = netdev_priv(dev); 1322 1323 if (!ip6gre_tunnel_unregistering(t)) { 1324 ip6gre_tunnel_unlink(ign, t); 1325 synchronize_net(); 1326 ip6gre_tnl_change(t, &p1, 1); 1327 ip6gre_tunnel_link(ign, t); 1328 netdev_state_change(dev); 1329 } 1330 } 1331 } 1332 1333 if (t && !ip6gre_tunnel_unregistering(t)) { 1334 err = 0; 1335 1336 memset(&p, 0, sizeof(p)); 1337 ip6gre_tnl_parm_to_user(&p, &t->parms); 1338 if (copy_to_user(data, &p, sizeof(p))) 1339 err = -EFAULT; 1340 } else { 1341 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); 1342 } 1343 break; 1344 1345 case SIOCDELTUNNEL: 1346 err = -EPERM; 1347 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1348 goto done; 1349 1350 if (dev == ign->fb_tunnel_dev) { 1351 err = -EFAULT; 1352 if (copy_from_user(&p, data, sizeof(p))) 1353 goto done; 1354 err = -ENOENT; 1355 ip6gre_tnl_parm_from_user(&p1, &p); 1356 t = ip6gre_tunnel_locate(net, &p1, 0); 1357 if (!t) 1358 goto done; 1359 err = -EPERM; 1360 if (t == netdev_priv(ign->fb_tunnel_dev)) 1361 goto done; 1362 dev = t->dev; 1363 } 1364 1365 if (!ip6gre_tunnel_unregistering(t)) 1366 __ip6gre_dellink(orig_net, dev, &dev_kill_list); 1367 err = 0; 1368 break; 1369 1370 default: 1371 err = -EINVAL; 1372 } 1373 1374 done: 1375 mutex_unlock(&ign->tunnels_lock); 1376 1377 unregister_netdevice_many(&dev_kill_list); 1378 return err; 1379 } 1380 1381 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev, 1382 unsigned short type, const void *daddr, 1383 const void *saddr, unsigned int len) 1384 { 1385 struct ip6_tnl *t = netdev_priv(dev); 1386 struct ipv6hdr *ipv6h; 1387 int needed; 1388 __be16 *p; 1389 1390 needed = t->hlen + sizeof(*ipv6h); 1391 if (skb_headroom(skb) < needed && 1392 pskb_expand_head(skb, HH_DATA_ALIGN(needed - skb_headroom(skb)), 1393 0, GFP_ATOMIC)) 1394 return -needed; 1395 1396 ipv6h = skb_push(skb, needed); 1397 ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb, 1398 t->fl.u.ip6.flowlabel, 1399 true, &t->fl.u.ip6)); 1400 ipv6h->hop_limit = t->parms.hop_limit; 1401 ipv6h->nexthdr = NEXTHDR_GRE; 1402 ipv6h->saddr = t->parms.laddr; 1403 ipv6h->daddr = t->parms.raddr; 1404 1405 p = (__be16 *)(ipv6h + 1); 1406 p[0] = ip_tunnel_flags_to_be16(t->parms.o_flags); 1407 p[1] = htons(type); 1408 1409 /* 1410 * Set the source hardware address. 1411 */ 1412 1413 if (saddr) 1414 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr)); 1415 if (daddr) 1416 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr)); 1417 if (!ipv6_addr_any(&ipv6h->daddr)) 1418 return t->hlen; 1419 1420 return -t->hlen; 1421 } 1422 1423 static const struct header_ops ip6gre_header_ops = { 1424 .create = ip6gre_header, 1425 }; 1426 1427 static const struct net_device_ops ip6gre_netdev_ops = { 1428 .ndo_init = ip6gre_tunnel_init, 1429 .ndo_uninit = ip6gre_tunnel_uninit, 1430 .ndo_start_xmit = ip6gre_tunnel_xmit, 1431 .ndo_siocdevprivate = ip6gre_tunnel_siocdevprivate, 1432 .ndo_change_mtu = ip6_tnl_change_mtu, 1433 .ndo_get_iflink = ip6_tnl_get_iflink, 1434 }; 1435 1436 static void ip6gre_dev_free(struct net_device *dev) 1437 { 1438 struct ip6_tnl *t = netdev_priv(dev); 1439 1440 gro_cells_destroy(&t->gro_cells); 1441 dst_cache_destroy(&t->dst_cache); 1442 } 1443 1444 static void ip6gre_tunnel_setup(struct net_device *dev) 1445 { 1446 dev->netdev_ops = &ip6gre_netdev_ops; 1447 dev->needs_free_netdev = true; 1448 dev->priv_destructor = ip6gre_dev_free; 1449 1450 dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS; 1451 dev->type = ARPHRD_IP6GRE; 1452 1453 dev->flags |= IFF_NOARP; 1454 dev->addr_len = sizeof(struct in6_addr); 1455 netif_keep_dst(dev); 1456 /* This perm addr will be used as interface identifier by IPv6 */ 1457 dev->addr_assign_type = NET_ADDR_RANDOM; 1458 eth_random_addr(dev->perm_addr); 1459 } 1460 1461 #define GRE6_FEATURES (NETIF_F_SG | \ 1462 NETIF_F_FRAGLIST | \ 1463 NETIF_F_HIGHDMA | \ 1464 NETIF_F_HW_CSUM) 1465 1466 static void ip6gre_tnl_init_features(struct net_device *dev) 1467 { 1468 struct ip6_tnl *nt = netdev_priv(dev); 1469 1470 dev->features |= GRE6_FEATURES; 1471 dev->hw_features |= GRE6_FEATURES; 1472 1473 dev->lltx = true; 1474 1475 /* TCP offload with GRE SEQ is not supported, nor can we support 2 1476 * levels of outer headers requiring an update. 1477 */ 1478 if (test_bit(IP_TUNNEL_SEQ_BIT, nt->parms.o_flags)) 1479 return; 1480 if (test_bit(IP_TUNNEL_CSUM_BIT, nt->parms.o_flags) && 1481 nt->encap.type != TUNNEL_ENCAP_NONE) 1482 return; 1483 1484 dev->features |= NETIF_F_GSO_SOFTWARE; 1485 dev->hw_features |= NETIF_F_GSO_SOFTWARE; 1486 } 1487 1488 static int ip6gre_tunnel_init_common(struct net_device *dev) 1489 { 1490 struct ip6_tnl *tunnel; 1491 int ret; 1492 int t_hlen; 1493 1494 tunnel = netdev_priv(dev); 1495 1496 tunnel->dev = dev; 1497 strscpy(tunnel->parms.name, dev->name); 1498 1499 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); 1500 if (ret) 1501 return ret; 1502 1503 ret = gro_cells_init(&tunnel->gro_cells, dev); 1504 if (ret) 1505 goto cleanup_dst_cache_init; 1506 1507 t_hlen = ip6gre_calc_hlen(tunnel); 1508 dev->mtu = ETH_DATA_LEN - t_hlen; 1509 if (dev->type == ARPHRD_ETHER) 1510 dev->mtu -= ETH_HLEN; 1511 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1512 dev->mtu -= 8; 1513 1514 if (tunnel->parms.collect_md) { 1515 netif_keep_dst(dev); 1516 } 1517 ip6gre_tnl_init_features(dev); 1518 1519 netdev_hold(dev, &tunnel->dev_tracker, GFP_KERNEL); 1520 netdev_lockdep_set_classes(dev); 1521 return 0; 1522 1523 cleanup_dst_cache_init: 1524 dst_cache_destroy(&tunnel->dst_cache); 1525 return ret; 1526 } 1527 1528 static int ip6gre_tunnel_init(struct net_device *dev) 1529 { 1530 struct ip6_tnl *tunnel; 1531 int ret; 1532 1533 ret = ip6gre_tunnel_init_common(dev); 1534 if (ret) 1535 return ret; 1536 1537 tunnel = netdev_priv(dev); 1538 1539 if (tunnel->parms.collect_md) 1540 return 0; 1541 1542 __dev_addr_set(dev, &tunnel->parms.laddr, sizeof(struct in6_addr)); 1543 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr)); 1544 1545 if (ipv6_addr_any(&tunnel->parms.raddr)) 1546 dev->header_ops = &ip6gre_header_ops; 1547 1548 return 0; 1549 } 1550 1551 static void ip6gre_fb_tunnel_init(struct net_device *dev) 1552 { 1553 struct ip6_tnl *tunnel = netdev_priv(dev); 1554 1555 tunnel->dev = dev; 1556 tunnel->net = dev_net(dev); 1557 strscpy(tunnel->parms.name, dev->name); 1558 1559 tunnel->hlen = sizeof(struct ipv6hdr) + 4; 1560 } 1561 1562 static struct inet6_protocol ip6gre_protocol __read_mostly = { 1563 .handler = gre_rcv, 1564 .err_handler = ip6gre_err, 1565 .flags = INET6_PROTO_FINAL, 1566 }; 1567 1568 static void __net_exit ip6gre_exit_rtnl_net(struct net *net, 1569 struct list_head *dev_kill_list) 1570 { 1571 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1572 int prio; 1573 1574 WRITE_ONCE(ign->fb_tunnel_dev, NULL); 1575 1576 mutex_lock(&ign->tunnels_lock); 1577 1578 for (prio = 0; prio < 4; prio++) { 1579 int h; 1580 1581 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) { 1582 struct hlist_head *head = &ign->tunnels[prio][h]; 1583 struct hlist_node *tmp; 1584 struct ip6_tnl *t; 1585 1586 hlist_for_each_entry_safe(t, tmp, head, hash_node) 1587 __ip6gre_dellink(net, t->dev, dev_kill_list); 1588 } 1589 } 1590 1591 mutex_unlock(&ign->tunnels_lock); 1592 } 1593 1594 static int __net_init ip6gre_init_net(struct net *net) 1595 { 1596 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1597 struct net_device *ndev; 1598 struct ip6_tnl *t; 1599 int prio, h; 1600 int err; 1601 1602 for (prio = 0; prio < 4; prio++) { 1603 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) 1604 INIT_HLIST_HEAD(&ign->tunnels[prio][h]); 1605 } 1606 1607 mutex_init(&ign->tunnels_lock); 1608 1609 if (!net_has_fallback_tunnels(net)) 1610 return 0; 1611 ndev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0", 1612 NET_NAME_UNKNOWN, ip6gre_tunnel_setup); 1613 if (!ndev) { 1614 err = -ENOMEM; 1615 goto err_alloc_dev; 1616 } 1617 ign->fb_tunnel_dev = ndev; 1618 dev_net_set(ign->fb_tunnel_dev, net); 1619 /* FB netdevice is special: we have one, and only one per netns. 1620 * Allowing to move it to another netns is clearly unsafe. 1621 */ 1622 ign->fb_tunnel_dev->netns_immutable = true; 1623 1624 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev); 1625 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops; 1626 1627 t = netdev_priv(ign->fb_tunnel_dev); 1628 hlist_add_head_rcu(&t->hash_node, &ign->tunnels_wc[0]); 1629 1630 err = register_netdev(ign->fb_tunnel_dev); 1631 if (err) 1632 goto err_reg_dev; 1633 1634 return 0; 1635 1636 err_reg_dev: 1637 free_netdev(ndev); 1638 err_alloc_dev: 1639 return err; 1640 } 1641 1642 static struct pernet_operations ip6gre_net_ops = { 1643 .init = ip6gre_init_net, 1644 .exit_rtnl = ip6gre_exit_rtnl_net, 1645 .id = &ip6gre_net_id, 1646 .size = sizeof(struct ip6gre_net), 1647 }; 1648 1649 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[], 1650 struct netlink_ext_ack *extack) 1651 { 1652 __be16 flags; 1653 1654 if (!data) 1655 return 0; 1656 1657 flags = 0; 1658 if (data[IFLA_GRE_IFLAGS]) 1659 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); 1660 if (data[IFLA_GRE_OFLAGS]) 1661 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); 1662 if (flags & (GRE_VERSION|GRE_ROUTING)) 1663 return -EINVAL; 1664 1665 return 0; 1666 } 1667 1668 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[], 1669 struct netlink_ext_ack *extack) 1670 { 1671 struct in6_addr daddr; 1672 1673 if (tb[IFLA_ADDRESS]) { 1674 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 1675 return -EINVAL; 1676 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 1677 return -EADDRNOTAVAIL; 1678 } 1679 1680 if (!data) 1681 goto out; 1682 1683 if (data[IFLA_GRE_REMOTE]) { 1684 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]); 1685 if (ipv6_addr_any(&daddr)) 1686 return -EINVAL; 1687 } 1688 1689 out: 1690 return ip6gre_tunnel_validate(tb, data, extack); 1691 } 1692 1693 static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[], 1694 struct netlink_ext_ack *extack) 1695 { 1696 __be16 flags = 0; 1697 int ret, ver = 0; 1698 1699 if (!data) 1700 return 0; 1701 1702 ret = ip6gre_tap_validate(tb, data, extack); 1703 if (ret) 1704 return ret; 1705 1706 /* ERSPAN should only have GRE sequence and key flag */ 1707 if (data[IFLA_GRE_OFLAGS]) 1708 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); 1709 if (data[IFLA_GRE_IFLAGS]) 1710 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); 1711 if (!data[IFLA_GRE_COLLECT_METADATA] && 1712 flags != (GRE_SEQ | GRE_KEY)) 1713 return -EINVAL; 1714 1715 /* ERSPAN Session ID only has 10-bit. Since we reuse 1716 * 32-bit key field as ID, check it's range. 1717 */ 1718 if (data[IFLA_GRE_IKEY] && 1719 (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK)) 1720 return -EINVAL; 1721 1722 if (data[IFLA_GRE_OKEY] && 1723 (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK)) 1724 return -EINVAL; 1725 1726 if (data[IFLA_GRE_ERSPAN_VER]) { 1727 ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]); 1728 if (ver != 1 && ver != 2) 1729 return -EINVAL; 1730 } 1731 1732 if (ver == 1) { 1733 if (data[IFLA_GRE_ERSPAN_INDEX]) { 1734 u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]); 1735 1736 if (index & ~INDEX_MASK) 1737 return -EINVAL; 1738 } 1739 } else if (ver == 2) { 1740 if (data[IFLA_GRE_ERSPAN_DIR]) { 1741 u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]); 1742 1743 if (dir & ~(DIR_MASK >> DIR_OFFSET)) 1744 return -EINVAL; 1745 } 1746 1747 if (data[IFLA_GRE_ERSPAN_HWID]) { 1748 u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]); 1749 1750 if (hwid & ~(HWID_MASK >> HWID_OFFSET)) 1751 return -EINVAL; 1752 } 1753 } 1754 1755 return 0; 1756 } 1757 1758 static void ip6erspan_set_version(struct nlattr *data[], 1759 struct __ip6_tnl_parm *parms) 1760 { 1761 if (!data) 1762 return; 1763 1764 parms->erspan_ver = 1; 1765 if (data[IFLA_GRE_ERSPAN_VER]) 1766 parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]); 1767 1768 if (parms->erspan_ver == 1) { 1769 if (data[IFLA_GRE_ERSPAN_INDEX]) 1770 parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]); 1771 } else if (parms->erspan_ver == 2) { 1772 if (data[IFLA_GRE_ERSPAN_DIR]) 1773 parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]); 1774 if (data[IFLA_GRE_ERSPAN_HWID]) 1775 parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]); 1776 } 1777 } 1778 1779 static void ip6gre_netlink_parms(struct nlattr *data[], 1780 struct __ip6_tnl_parm *parms) 1781 { 1782 memset(parms, 0, sizeof(*parms)); 1783 1784 if (!data) 1785 return; 1786 1787 if (data[IFLA_GRE_LINK]) 1788 parms->link = nla_get_u32(data[IFLA_GRE_LINK]); 1789 1790 if (data[IFLA_GRE_IFLAGS]) 1791 gre_flags_to_tnl_flags(parms->i_flags, 1792 nla_get_be16(data[IFLA_GRE_IFLAGS])); 1793 1794 if (data[IFLA_GRE_OFLAGS]) 1795 gre_flags_to_tnl_flags(parms->o_flags, 1796 nla_get_be16(data[IFLA_GRE_OFLAGS])); 1797 1798 if (data[IFLA_GRE_IKEY]) 1799 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]); 1800 1801 if (data[IFLA_GRE_OKEY]) 1802 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]); 1803 1804 if (data[IFLA_GRE_LOCAL]) 1805 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]); 1806 1807 if (data[IFLA_GRE_REMOTE]) 1808 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]); 1809 1810 if (data[IFLA_GRE_TTL]) 1811 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]); 1812 1813 if (data[IFLA_GRE_ENCAP_LIMIT]) 1814 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]); 1815 1816 if (data[IFLA_GRE_FLOWINFO]) 1817 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]); 1818 1819 if (data[IFLA_GRE_FLAGS]) 1820 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]); 1821 1822 if (data[IFLA_GRE_FWMARK]) 1823 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]); 1824 1825 if (data[IFLA_GRE_COLLECT_METADATA]) 1826 parms->collect_md = true; 1827 } 1828 1829 static int ip6gre_tap_init(struct net_device *dev) 1830 { 1831 int ret; 1832 1833 ret = ip6gre_tunnel_init_common(dev); 1834 if (ret) 1835 return ret; 1836 1837 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 1838 1839 return 0; 1840 } 1841 1842 static const struct net_device_ops ip6gre_tap_netdev_ops = { 1843 .ndo_init = ip6gre_tap_init, 1844 .ndo_uninit = ip6gre_tunnel_uninit, 1845 .ndo_start_xmit = ip6gre_tunnel_xmit, 1846 .ndo_set_mac_address = eth_mac_addr, 1847 .ndo_validate_addr = eth_validate_addr, 1848 .ndo_change_mtu = ip6_tnl_change_mtu, 1849 .ndo_get_iflink = ip6_tnl_get_iflink, 1850 }; 1851 1852 static int ip6erspan_calc_hlen(struct ip6_tnl *tunnel) 1853 { 1854 int t_hlen; 1855 1856 tunnel->tun_hlen = 8; 1857 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen + 1858 erspan_hdr_len(tunnel->parms.erspan_ver); 1859 1860 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr); 1861 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen; 1862 return t_hlen; 1863 } 1864 1865 static int ip6erspan_tap_init(struct net_device *dev) 1866 { 1867 struct ip6_tnl *tunnel; 1868 int t_hlen; 1869 int ret; 1870 1871 tunnel = netdev_priv(dev); 1872 1873 tunnel->dev = dev; 1874 strscpy(tunnel->parms.name, dev->name); 1875 1876 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); 1877 if (ret) 1878 return ret; 1879 1880 ret = gro_cells_init(&tunnel->gro_cells, dev); 1881 if (ret) 1882 goto cleanup_dst_cache_init; 1883 1884 t_hlen = ip6erspan_calc_hlen(tunnel); 1885 dev->mtu = ETH_DATA_LEN - t_hlen; 1886 if (dev->type == ARPHRD_ETHER) 1887 dev->mtu -= ETH_HLEN; 1888 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1889 dev->mtu -= 8; 1890 1891 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 1892 ip6erspan_tnl_link_config(tunnel, 1); 1893 1894 netdev_hold(dev, &tunnel->dev_tracker, GFP_KERNEL); 1895 netdev_lockdep_set_classes(dev); 1896 return 0; 1897 1898 cleanup_dst_cache_init: 1899 dst_cache_destroy(&tunnel->dst_cache); 1900 return ret; 1901 } 1902 1903 static const struct net_device_ops ip6erspan_netdev_ops = { 1904 .ndo_init = ip6erspan_tap_init, 1905 .ndo_uninit = ip6erspan_tunnel_uninit, 1906 .ndo_start_xmit = ip6erspan_tunnel_xmit, 1907 .ndo_set_mac_address = eth_mac_addr, 1908 .ndo_validate_addr = eth_validate_addr, 1909 .ndo_change_mtu = ip6_tnl_change_mtu, 1910 .ndo_get_iflink = ip6_tnl_get_iflink, 1911 }; 1912 1913 static void ip6gre_tap_setup(struct net_device *dev) 1914 { 1915 1916 ether_setup(dev); 1917 1918 dev->max_mtu = 0; 1919 dev->netdev_ops = &ip6gre_tap_netdev_ops; 1920 dev->needs_free_netdev = true; 1921 dev->priv_destructor = ip6gre_dev_free; 1922 1923 dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS; 1924 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1925 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 1926 netif_keep_dst(dev); 1927 } 1928 1929 static bool ip6gre_netlink_encap_parms(struct nlattr *data[], 1930 struct ip_tunnel_encap *ipencap) 1931 { 1932 bool ret = false; 1933 1934 memset(ipencap, 0, sizeof(*ipencap)); 1935 1936 if (!data) 1937 return ret; 1938 1939 if (data[IFLA_GRE_ENCAP_TYPE]) { 1940 ret = true; 1941 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]); 1942 } 1943 1944 if (data[IFLA_GRE_ENCAP_FLAGS]) { 1945 ret = true; 1946 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]); 1947 } 1948 1949 if (data[IFLA_GRE_ENCAP_SPORT]) { 1950 ret = true; 1951 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]); 1952 } 1953 1954 if (data[IFLA_GRE_ENCAP_DPORT]) { 1955 ret = true; 1956 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]); 1957 } 1958 1959 return ret; 1960 } 1961 1962 static int ip6gre_newlink_common(struct net *link_net, struct net_device *dev, 1963 struct nlattr *tb[], struct nlattr *data[], 1964 struct netlink_ext_ack *extack) 1965 { 1966 struct ip6_tnl *nt; 1967 struct ip_tunnel_encap ipencap; 1968 int err; 1969 1970 nt = netdev_priv(dev); 1971 1972 if (ip6gre_netlink_encap_parms(data, &ipencap)) { 1973 int err = ip6_tnl_encap_setup(nt, &ipencap); 1974 1975 if (err < 0) 1976 return err; 1977 } 1978 1979 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS]) 1980 eth_hw_addr_random(dev); 1981 1982 nt->dev = dev; 1983 nt->net = link_net; 1984 1985 err = register_netdevice(dev); 1986 if (err) 1987 goto out; 1988 1989 if (tb[IFLA_MTU]) 1990 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 1991 1992 out: 1993 return err; 1994 } 1995 1996 static int ip6gre_newlink(struct net_device *dev, 1997 struct rtnl_newlink_params *params, 1998 struct netlink_ext_ack *extack) 1999 { 2000 struct net *net = params->link_net ? : dev_net(dev); 2001 struct ip6_tnl *nt = netdev_priv(dev); 2002 struct nlattr **data = params->data; 2003 struct nlattr **tb = params->tb; 2004 struct ip6gre_net *ign; 2005 int err = 0; 2006 2007 ip6gre_netlink_parms(data, &nt->parms); 2008 ign = net_generic(net, ip6gre_net_id); 2009 2010 mutex_lock(&ign->tunnels_lock); 2011 2012 if (nt->parms.collect_md) { 2013 if (rtnl_dereference(ign->collect_md_tun)) 2014 err = -EEXIST; 2015 } else { 2016 if (ip6gre_tunnel_find(net, &nt->parms, dev->type)) 2017 err = -EEXIST; 2018 } 2019 if (err) 2020 goto unlock; 2021 2022 err = ip6gre_newlink_common(net, dev, tb, data, extack); 2023 if (!err) { 2024 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]); 2025 ip6gre_tunnel_link_md(ign, nt); 2026 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt); 2027 } 2028 2029 unlock: 2030 mutex_unlock(&ign->tunnels_lock); 2031 2032 return err; 2033 } 2034 2035 static struct ip6_tnl * 2036 ip6gre_changelink_common(struct net_device *dev, struct nlattr *tb[], 2037 struct nlattr *data[], struct __ip6_tnl_parm *p_p, 2038 struct netlink_ext_ack *extack) 2039 { 2040 struct ip6_tnl *t, *nt = netdev_priv(dev); 2041 struct net *net = nt->net; 2042 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 2043 struct ip_tunnel_encap ipencap; 2044 2045 if (dev == ign->fb_tunnel_dev) 2046 return ERR_PTR(-EINVAL); 2047 2048 if (ip6gre_netlink_encap_parms(data, &ipencap)) { 2049 int err = ip6_tnl_encap_setup(nt, &ipencap); 2050 2051 if (err < 0) 2052 return ERR_PTR(err); 2053 } 2054 2055 ip6gre_netlink_parms(data, p_p); 2056 2057 t = ip6gre_tunnel_locate(net, p_p, 0); 2058 2059 if (t) { 2060 if (t->dev != dev) 2061 return ERR_PTR(-EEXIST); 2062 } else { 2063 t = nt; 2064 } 2065 2066 if (ip6gre_tunnel_unregistering(t)) 2067 return ERR_PTR(-ENODEV); 2068 2069 return t; 2070 } 2071 2072 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[], 2073 struct nlattr *data[], 2074 struct netlink_ext_ack *extack) 2075 { 2076 struct ip6_tnl *t = netdev_priv(dev); 2077 struct __ip6_tnl_parm p; 2078 struct ip6gre_net *ign; 2079 int err = 0; 2080 2081 ign = net_generic(t->net, ip6gre_net_id); 2082 2083 if (!rtnl_dev_link_net_capable(dev, t->net)) 2084 return -EPERM; 2085 2086 mutex_lock(&ign->tunnels_lock); 2087 2088 t = ip6gre_changelink_common(dev, tb, data, &p, extack); 2089 if (IS_ERR(t)) { 2090 err = PTR_ERR(t); 2091 goto unlock; 2092 } 2093 2094 ip6gre_tunnel_unlink_md(ign, t); 2095 ip6gre_tunnel_unlink(ign, t); 2096 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]); 2097 ip6gre_tunnel_link_md(ign, t); 2098 ip6gre_tunnel_link(ign, t); 2099 unlock: 2100 mutex_unlock(&ign->tunnels_lock); 2101 2102 return err; 2103 } 2104 2105 static void __ip6gre_dellink(struct net *net, struct net_device *dev, 2106 struct list_head *head) 2107 { 2108 struct ip6_tnl *t = netdev_priv(dev); 2109 struct ip6gre_net *ign; 2110 2111 ign = net_generic(t->net, ip6gre_net_id); 2112 2113 if (dev->rtnl_link_ops == &ip6erspan_tap_ops) 2114 ip6erspan_tunnel_unlink_md(ign, t); 2115 else 2116 ip6gre_tunnel_unlink_md(ign, t); 2117 2118 ip6gre_tunnel_unlink(ign, t); 2119 unregister_netdevice_queue_net(net, dev, head); 2120 } 2121 2122 static void ip6gre_dellink(struct net_device *dev, struct list_head *head) 2123 { 2124 struct ip6_tnl *t = netdev_priv(dev); 2125 struct ip6gre_net *ign; 2126 2127 ign = net_generic(t->net, ip6gre_net_id); 2128 2129 mutex_lock(&ign->tunnels_lock); 2130 2131 if (dev != ign->fb_tunnel_dev && 2132 !ip6gre_tunnel_unregistering(t)) 2133 __ip6gre_dellink(dev_net(dev), dev, head); 2134 2135 mutex_unlock(&ign->tunnels_lock); 2136 } 2137 2138 static size_t ip6gre_get_size(const struct net_device *dev) 2139 { 2140 return 2141 /* IFLA_GRE_LINK */ 2142 nla_total_size(4) + 2143 /* IFLA_GRE_IFLAGS */ 2144 nla_total_size(2) + 2145 /* IFLA_GRE_OFLAGS */ 2146 nla_total_size(2) + 2147 /* IFLA_GRE_IKEY */ 2148 nla_total_size(4) + 2149 /* IFLA_GRE_OKEY */ 2150 nla_total_size(4) + 2151 /* IFLA_GRE_LOCAL */ 2152 nla_total_size(sizeof(struct in6_addr)) + 2153 /* IFLA_GRE_REMOTE */ 2154 nla_total_size(sizeof(struct in6_addr)) + 2155 /* IFLA_GRE_TTL */ 2156 nla_total_size(1) + 2157 /* IFLA_GRE_ENCAP_LIMIT */ 2158 nla_total_size(1) + 2159 /* IFLA_GRE_FLOWINFO */ 2160 nla_total_size(4) + 2161 /* IFLA_GRE_FLAGS */ 2162 nla_total_size(4) + 2163 /* IFLA_GRE_ENCAP_TYPE */ 2164 nla_total_size(2) + 2165 /* IFLA_GRE_ENCAP_FLAGS */ 2166 nla_total_size(2) + 2167 /* IFLA_GRE_ENCAP_SPORT */ 2168 nla_total_size(2) + 2169 /* IFLA_GRE_ENCAP_DPORT */ 2170 nla_total_size(2) + 2171 /* IFLA_GRE_COLLECT_METADATA */ 2172 nla_total_size(0) + 2173 /* IFLA_GRE_FWMARK */ 2174 nla_total_size(4) + 2175 /* IFLA_GRE_ERSPAN_INDEX */ 2176 nla_total_size(4) + 2177 0; 2178 } 2179 2180 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev) 2181 { 2182 const struct ip6_tnl *t = netdev_priv(dev); 2183 const struct __ip6_tnl_parm *p = &t->parms; 2184 IP_TUNNEL_DECLARE_FLAGS(o_flags); 2185 2186 ip_tunnel_flags_copy(o_flags, p->o_flags); 2187 2188 if (p->erspan_ver == 1 || p->erspan_ver == 2) { 2189 if (!p->collect_md) 2190 __set_bit(IP_TUNNEL_KEY_BIT, o_flags); 2191 2192 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, p->erspan_ver)) 2193 goto nla_put_failure; 2194 2195 if (p->erspan_ver == 1) { 2196 if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index)) 2197 goto nla_put_failure; 2198 } else { 2199 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, p->dir)) 2200 goto nla_put_failure; 2201 if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, p->hwid)) 2202 goto nla_put_failure; 2203 } 2204 } 2205 2206 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) || 2207 nla_put_be16(skb, IFLA_GRE_IFLAGS, 2208 gre_tnl_flags_to_gre_flags(p->i_flags)) || 2209 nla_put_be16(skb, IFLA_GRE_OFLAGS, 2210 gre_tnl_flags_to_gre_flags(o_flags)) || 2211 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) || 2212 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) || 2213 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) || 2214 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) || 2215 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) || 2216 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) || 2217 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) || 2218 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) || 2219 nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark)) 2220 goto nla_put_failure; 2221 2222 if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE, 2223 t->encap.type) || 2224 nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT, 2225 t->encap.sport) || 2226 nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT, 2227 t->encap.dport) || 2228 nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS, 2229 t->encap.flags)) 2230 goto nla_put_failure; 2231 2232 if (p->collect_md) { 2233 if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA)) 2234 goto nla_put_failure; 2235 } 2236 2237 return 0; 2238 2239 nla_put_failure: 2240 return -EMSGSIZE; 2241 } 2242 2243 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = { 2244 [IFLA_GRE_LINK] = { .type = NLA_U32 }, 2245 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 }, 2246 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 }, 2247 [IFLA_GRE_IKEY] = { .type = NLA_U32 }, 2248 [IFLA_GRE_OKEY] = { .type = NLA_U32 }, 2249 [IFLA_GRE_LOCAL] = { .len = sizeof_field(struct ipv6hdr, saddr) }, 2250 [IFLA_GRE_REMOTE] = { .len = sizeof_field(struct ipv6hdr, daddr) }, 2251 [IFLA_GRE_TTL] = { .type = NLA_U8 }, 2252 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 }, 2253 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 }, 2254 [IFLA_GRE_FLAGS] = { .type = NLA_U32 }, 2255 [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 }, 2256 [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 }, 2257 [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 }, 2258 [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 }, 2259 [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG }, 2260 [IFLA_GRE_FWMARK] = { .type = NLA_U32 }, 2261 [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 }, 2262 [IFLA_GRE_ERSPAN_VER] = { .type = NLA_U8 }, 2263 [IFLA_GRE_ERSPAN_DIR] = { .type = NLA_U8 }, 2264 [IFLA_GRE_ERSPAN_HWID] = { .type = NLA_U16 }, 2265 }; 2266 2267 static void ip6erspan_tap_setup(struct net_device *dev) 2268 { 2269 ether_setup(dev); 2270 2271 dev->max_mtu = 0; 2272 dev->netdev_ops = &ip6erspan_netdev_ops; 2273 dev->needs_free_netdev = true; 2274 dev->priv_destructor = ip6gre_dev_free; 2275 2276 dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS; 2277 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 2278 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 2279 netif_keep_dst(dev); 2280 } 2281 2282 static int ip6erspan_newlink(struct net_device *dev, 2283 struct rtnl_newlink_params *params, 2284 struct netlink_ext_ack *extack) 2285 { 2286 struct net *net = params->link_net ? : dev_net(dev); 2287 struct ip6_tnl *nt = netdev_priv(dev); 2288 struct nlattr **data = params->data; 2289 struct nlattr **tb = params->tb; 2290 struct ip6gre_net *ign; 2291 int err = 0; 2292 2293 ip6gre_netlink_parms(data, &nt->parms); 2294 ip6erspan_set_version(data, &nt->parms); 2295 ign = net_generic(net, ip6gre_net_id); 2296 2297 mutex_lock(&ign->tunnels_lock); 2298 2299 if (nt->parms.collect_md) { 2300 if (rtnl_dereference(ign->collect_md_tun_erspan)) 2301 err = -EEXIST; 2302 } else { 2303 if (ip6gre_tunnel_find(net, &nt->parms, dev->type)) 2304 err = -EEXIST; 2305 } 2306 if (err) 2307 goto unlock; 2308 2309 err = ip6gre_newlink_common(net, dev, tb, data, extack); 2310 if (!err) { 2311 ip6erspan_tnl_link_config(nt, !tb[IFLA_MTU]); 2312 ip6erspan_tunnel_link_md(ign, nt); 2313 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt); 2314 } 2315 2316 unlock: 2317 mutex_unlock(&ign->tunnels_lock); 2318 2319 return err; 2320 } 2321 2322 static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu) 2323 { 2324 ip6gre_tnl_link_config_common(t); 2325 ip6gre_tnl_link_config_route(t, set_mtu, ip6erspan_calc_hlen(t)); 2326 } 2327 2328 static int ip6erspan_tnl_change(struct ip6_tnl *t, 2329 const struct __ip6_tnl_parm *p, int set_mtu) 2330 { 2331 ip6gre_tnl_copy_tnl_parm(t, p); 2332 ip6erspan_tnl_link_config(t, set_mtu); 2333 return 0; 2334 } 2335 2336 static int ip6erspan_changelink(struct net_device *dev, struct nlattr *tb[], 2337 struct nlattr *data[], 2338 struct netlink_ext_ack *extack) 2339 { 2340 struct ip6_tnl *t = netdev_priv(dev); 2341 struct __ip6_tnl_parm p; 2342 struct ip6gre_net *ign; 2343 int err = 0; 2344 2345 if (!rtnl_dev_link_net_capable(dev, t->net)) 2346 return -EPERM; 2347 2348 ign = net_generic(t->net, ip6gre_net_id); 2349 2350 mutex_lock(&ign->tunnels_lock); 2351 2352 t = ip6gre_changelink_common(dev, tb, data, &p, extack); 2353 if (IS_ERR(t)) { 2354 err = PTR_ERR(t); 2355 goto unlock; 2356 } 2357 2358 ip6erspan_set_version(data, &p); 2359 ip6erspan_tunnel_unlink_md(ign, t); 2360 ip6gre_tunnel_unlink(ign, t); 2361 ip6erspan_tnl_change(t, &p, !tb[IFLA_MTU]); 2362 ip6erspan_tunnel_link_md(ign, t); 2363 ip6gre_tunnel_link(ign, t); 2364 unlock: 2365 mutex_unlock(&ign->tunnels_lock); 2366 2367 return err; 2368 } 2369 2370 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = { 2371 .kind = "ip6gre", 2372 .maxtype = IFLA_GRE_MAX, 2373 .policy = ip6gre_policy, 2374 .priv_size = sizeof(struct ip6_tnl), 2375 .setup = ip6gre_tunnel_setup, 2376 .validate = ip6gre_tunnel_validate, 2377 .newlink = ip6gre_newlink, 2378 .changelink = ip6gre_changelink, 2379 .dellink = ip6gre_dellink, 2380 .get_size = ip6gre_get_size, 2381 .fill_info = ip6gre_fill_info, 2382 .get_link_net = ip6_tnl_get_link_net, 2383 }; 2384 2385 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = { 2386 .kind = "ip6gretap", 2387 .maxtype = IFLA_GRE_MAX, 2388 .policy = ip6gre_policy, 2389 .priv_size = sizeof(struct ip6_tnl), 2390 .setup = ip6gre_tap_setup, 2391 .validate = ip6gre_tap_validate, 2392 .newlink = ip6gre_newlink, 2393 .changelink = ip6gre_changelink, 2394 .dellink = ip6gre_dellink, 2395 .get_size = ip6gre_get_size, 2396 .fill_info = ip6gre_fill_info, 2397 .get_link_net = ip6_tnl_get_link_net, 2398 }; 2399 2400 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly = { 2401 .kind = "ip6erspan", 2402 .maxtype = IFLA_GRE_MAX, 2403 .policy = ip6gre_policy, 2404 .priv_size = sizeof(struct ip6_tnl), 2405 .setup = ip6erspan_tap_setup, 2406 .validate = ip6erspan_tap_validate, 2407 .newlink = ip6erspan_newlink, 2408 .changelink = ip6erspan_changelink, 2409 .dellink = ip6gre_dellink, 2410 .get_size = ip6gre_get_size, 2411 .fill_info = ip6gre_fill_info, 2412 .get_link_net = ip6_tnl_get_link_net, 2413 }; 2414 2415 /* 2416 * And now the modules code and kernel interface. 2417 */ 2418 2419 static int __init ip6gre_init(void) 2420 { 2421 int err; 2422 2423 pr_info("GRE over IPv6 tunneling driver\n"); 2424 2425 err = register_pernet_device(&ip6gre_net_ops); 2426 if (err < 0) 2427 return err; 2428 2429 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE); 2430 if (err < 0) { 2431 pr_info("%s: can't add protocol\n", __func__); 2432 goto add_proto_failed; 2433 } 2434 2435 err = rtnl_link_register(&ip6gre_link_ops); 2436 if (err < 0) 2437 goto rtnl_link_failed; 2438 2439 err = rtnl_link_register(&ip6gre_tap_ops); 2440 if (err < 0) 2441 goto tap_ops_failed; 2442 2443 err = rtnl_link_register(&ip6erspan_tap_ops); 2444 if (err < 0) 2445 goto erspan_link_failed; 2446 2447 out: 2448 return err; 2449 2450 erspan_link_failed: 2451 rtnl_link_unregister(&ip6gre_tap_ops); 2452 tap_ops_failed: 2453 rtnl_link_unregister(&ip6gre_link_ops); 2454 rtnl_link_failed: 2455 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE); 2456 add_proto_failed: 2457 unregister_pernet_device(&ip6gre_net_ops); 2458 goto out; 2459 } 2460 2461 static void __exit ip6gre_fini(void) 2462 { 2463 rtnl_link_unregister(&ip6gre_tap_ops); 2464 rtnl_link_unregister(&ip6gre_link_ops); 2465 rtnl_link_unregister(&ip6erspan_tap_ops); 2466 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE); 2467 unregister_pernet_device(&ip6gre_net_ops); 2468 } 2469 2470 module_init(ip6gre_init); 2471 module_exit(ip6gre_fini); 2472 MODULE_LICENSE("GPL"); 2473 MODULE_AUTHOR("D. Kozlov <xeb@mail.ru>"); 2474 MODULE_DESCRIPTION("GRE over IPv6 tunneling device"); 2475 MODULE_ALIAS_RTNL_LINK("ip6gre"); 2476 MODULE_ALIAS_RTNL_LINK("ip6gretap"); 2477 MODULE_ALIAS_RTNL_LINK("ip6erspan"); 2478 MODULE_ALIAS_NETDEV("ip6gre0"); 2479