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/rtnetlink.h> 47 48 #include <net/ipv6.h> 49 #include <net/ip6_fib.h> 50 #include <net/ip6_route.h> 51 #include <net/ip6_tunnel.h> 52 #include <net/gre.h> 53 #include <net/erspan.h> 54 #include <net/dst_metadata.h> 55 56 57 static bool log_ecn_error = true; 58 module_param(log_ecn_error, bool, 0644); 59 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); 60 61 #define IP6_GRE_HASH_SIZE_SHIFT 5 62 #define IP6_GRE_HASH_SIZE (1 << IP6_GRE_HASH_SIZE_SHIFT) 63 64 static unsigned int ip6gre_net_id __read_mostly; 65 struct ip6gre_net { 66 struct ip6_tnl __rcu *tunnels[4][IP6_GRE_HASH_SIZE]; 67 68 struct ip6_tnl __rcu *collect_md_tun; 69 struct ip6_tnl __rcu *collect_md_tun_erspan; 70 struct net_device *fb_tunnel_dev; 71 }; 72 73 static struct rtnl_link_ops ip6gre_link_ops __read_mostly; 74 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly; 75 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly; 76 static int ip6gre_tunnel_init(struct net_device *dev); 77 static void ip6gre_tunnel_setup(struct net_device *dev); 78 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t); 79 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu); 80 static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu); 81 82 /* Tunnel hash table */ 83 84 /* 85 4 hash tables: 86 87 3: (remote,local) 88 2: (remote,*) 89 1: (*,local) 90 0: (*,*) 91 92 We require exact key match i.e. if a key is present in packet 93 it will match only tunnel with the same key; if it is not present, 94 it will match only keyless tunnel. 95 96 All keysless packets, if not matched configured keyless tunnels 97 will match fallback tunnel. 98 */ 99 100 #define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(IP6_GRE_HASH_SIZE - 1)) 101 static u32 HASH_ADDR(const struct in6_addr *addr) 102 { 103 u32 hash = ipv6_addr_hash(addr); 104 105 return hash_32(hash, IP6_GRE_HASH_SIZE_SHIFT); 106 } 107 108 #define tunnels_r_l tunnels[3] 109 #define tunnels_r tunnels[2] 110 #define tunnels_l tunnels[1] 111 #define tunnels_wc tunnels[0] 112 113 /* Given src, dst and key, find appropriate for input tunnel. */ 114 115 static struct ip6_tnl *ip6gre_tunnel_lookup(struct net_device *dev, 116 const struct in6_addr *remote, const struct in6_addr *local, 117 __be32 key, __be16 gre_proto) 118 { 119 struct net *net = dev_net(dev); 120 int link = dev->ifindex; 121 unsigned int h0 = HASH_ADDR(remote); 122 unsigned int h1 = HASH_KEY(key); 123 struct ip6_tnl *t, *cand = NULL; 124 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 125 int dev_type = (gre_proto == htons(ETH_P_TEB) || 126 gre_proto == htons(ETH_P_ERSPAN) || 127 gre_proto == htons(ETH_P_ERSPAN2)) ? 128 ARPHRD_ETHER : ARPHRD_IP6GRE; 129 int score, cand_score = 4; 130 struct net_device *ndev; 131 132 for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) { 133 if (!ipv6_addr_equal(local, &t->parms.laddr) || 134 !ipv6_addr_equal(remote, &t->parms.raddr) || 135 key != t->parms.i_key || 136 !(t->dev->flags & IFF_UP)) 137 continue; 138 139 if (t->dev->type != ARPHRD_IP6GRE && 140 t->dev->type != dev_type) 141 continue; 142 143 score = 0; 144 if (t->parms.link != link) 145 score |= 1; 146 if (t->dev->type != dev_type) 147 score |= 2; 148 if (score == 0) 149 return t; 150 151 if (score < cand_score) { 152 cand = t; 153 cand_score = score; 154 } 155 } 156 157 for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) { 158 if (!ipv6_addr_equal(remote, &t->parms.raddr) || 159 key != t->parms.i_key || 160 !(t->dev->flags & IFF_UP)) 161 continue; 162 163 if (t->dev->type != ARPHRD_IP6GRE && 164 t->dev->type != dev_type) 165 continue; 166 167 score = 0; 168 if (t->parms.link != link) 169 score |= 1; 170 if (t->dev->type != dev_type) 171 score |= 2; 172 if (score == 0) 173 return t; 174 175 if (score < cand_score) { 176 cand = t; 177 cand_score = score; 178 } 179 } 180 181 for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) { 182 if ((!ipv6_addr_equal(local, &t->parms.laddr) && 183 (!ipv6_addr_equal(local, &t->parms.raddr) || 184 !ipv6_addr_is_multicast(local))) || 185 key != t->parms.i_key || 186 !(t->dev->flags & IFF_UP)) 187 continue; 188 189 if (t->dev->type != ARPHRD_IP6GRE && 190 t->dev->type != dev_type) 191 continue; 192 193 score = 0; 194 if (t->parms.link != link) 195 score |= 1; 196 if (t->dev->type != dev_type) 197 score |= 2; 198 if (score == 0) 199 return t; 200 201 if (score < cand_score) { 202 cand = t; 203 cand_score = score; 204 } 205 } 206 207 for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) { 208 if (t->parms.i_key != key || 209 !(t->dev->flags & IFF_UP)) 210 continue; 211 212 if (t->dev->type != ARPHRD_IP6GRE && 213 t->dev->type != dev_type) 214 continue; 215 216 score = 0; 217 if (t->parms.link != link) 218 score |= 1; 219 if (t->dev->type != dev_type) 220 score |= 2; 221 if (score == 0) 222 return t; 223 224 if (score < cand_score) { 225 cand = t; 226 cand_score = score; 227 } 228 } 229 230 if (cand) 231 return cand; 232 233 if (gre_proto == htons(ETH_P_ERSPAN) || 234 gre_proto == htons(ETH_P_ERSPAN2)) 235 t = rcu_dereference(ign->collect_md_tun_erspan); 236 else 237 t = rcu_dereference(ign->collect_md_tun); 238 239 if (t && t->dev->flags & IFF_UP) 240 return t; 241 242 ndev = READ_ONCE(ign->fb_tunnel_dev); 243 if (ndev && ndev->flags & IFF_UP) 244 return netdev_priv(ndev); 245 246 return NULL; 247 } 248 249 static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign, 250 const struct __ip6_tnl_parm *p) 251 { 252 const struct in6_addr *remote = &p->raddr; 253 const struct in6_addr *local = &p->laddr; 254 unsigned int h = HASH_KEY(p->i_key); 255 int prio = 0; 256 257 if (!ipv6_addr_any(local)) 258 prio |= 1; 259 if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) { 260 prio |= 2; 261 h ^= HASH_ADDR(remote); 262 } 263 264 return &ign->tunnels[prio][h]; 265 } 266 267 static void ip6gre_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t) 268 { 269 if (t->parms.collect_md) 270 rcu_assign_pointer(ign->collect_md_tun, t); 271 } 272 273 static void ip6erspan_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t) 274 { 275 if (t->parms.collect_md) 276 rcu_assign_pointer(ign->collect_md_tun_erspan, t); 277 } 278 279 static void ip6gre_tunnel_unlink_md(struct ip6gre_net *ign, struct ip6_tnl *t) 280 { 281 if (t->parms.collect_md) 282 rcu_assign_pointer(ign->collect_md_tun, NULL); 283 } 284 285 static void ip6erspan_tunnel_unlink_md(struct ip6gre_net *ign, 286 struct ip6_tnl *t) 287 { 288 if (t->parms.collect_md) 289 rcu_assign_pointer(ign->collect_md_tun_erspan, NULL); 290 } 291 292 static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign, 293 const struct ip6_tnl *t) 294 { 295 return __ip6gre_bucket(ign, &t->parms); 296 } 297 298 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t) 299 { 300 struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t); 301 302 rcu_assign_pointer(t->next, rtnl_dereference(*tp)); 303 rcu_assign_pointer(*tp, t); 304 } 305 306 static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t) 307 { 308 struct ip6_tnl __rcu **tp; 309 struct ip6_tnl *iter; 310 311 for (tp = ip6gre_bucket(ign, t); 312 (iter = rtnl_dereference(*tp)) != NULL; 313 tp = &iter->next) { 314 if (t == iter) { 315 rcu_assign_pointer(*tp, t->next); 316 break; 317 } 318 } 319 } 320 321 static struct ip6_tnl *ip6gre_tunnel_find(struct net *net, 322 const struct __ip6_tnl_parm *parms, 323 int type) 324 { 325 const struct in6_addr *remote = &parms->raddr; 326 const struct in6_addr *local = &parms->laddr; 327 __be32 key = parms->i_key; 328 int link = parms->link; 329 struct ip6_tnl *t; 330 struct ip6_tnl __rcu **tp; 331 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 332 333 for (tp = __ip6gre_bucket(ign, parms); 334 (t = rtnl_dereference(*tp)) != NULL; 335 tp = &t->next) 336 if (ipv6_addr_equal(local, &t->parms.laddr) && 337 ipv6_addr_equal(remote, &t->parms.raddr) && 338 key == t->parms.i_key && 339 link == t->parms.link && 340 type == t->dev->type) 341 break; 342 343 return t; 344 } 345 346 static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net, 347 const struct __ip6_tnl_parm *parms, int create) 348 { 349 struct ip6_tnl *t, *nt; 350 struct net_device *dev; 351 char name[IFNAMSIZ]; 352 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 353 354 t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE); 355 if (t && create) 356 return NULL; 357 if (t || !create) 358 return t; 359 360 if (parms->name[0]) { 361 if (!dev_valid_name(parms->name)) 362 return NULL; 363 strlcpy(name, parms->name, IFNAMSIZ); 364 } else { 365 strcpy(name, "ip6gre%d"); 366 } 367 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, 368 ip6gre_tunnel_setup); 369 if (!dev) 370 return NULL; 371 372 dev_net_set(dev, net); 373 374 nt = netdev_priv(dev); 375 nt->parms = *parms; 376 dev->rtnl_link_ops = &ip6gre_link_ops; 377 378 nt->dev = dev; 379 nt->net = dev_net(dev); 380 381 if (register_netdevice(dev) < 0) 382 goto failed_free; 383 384 ip6gre_tnl_link_config(nt, 1); 385 386 /* Can use a lockless transmit, unless we generate output sequences */ 387 if (!(nt->parms.o_flags & TUNNEL_SEQ)) 388 dev->features |= NETIF_F_LLTX; 389 390 dev_hold(dev); 391 ip6gre_tunnel_link(ign, nt); 392 return nt; 393 394 failed_free: 395 free_netdev(dev); 396 return NULL; 397 } 398 399 static void ip6erspan_tunnel_uninit(struct net_device *dev) 400 { 401 struct ip6_tnl *t = netdev_priv(dev); 402 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id); 403 404 ip6erspan_tunnel_unlink_md(ign, t); 405 ip6gre_tunnel_unlink(ign, t); 406 dst_cache_reset(&t->dst_cache); 407 dev_put(dev); 408 } 409 410 static void ip6gre_tunnel_uninit(struct net_device *dev) 411 { 412 struct ip6_tnl *t = netdev_priv(dev); 413 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id); 414 415 ip6gre_tunnel_unlink_md(ign, t); 416 ip6gre_tunnel_unlink(ign, t); 417 if (ign->fb_tunnel_dev == dev) 418 WRITE_ONCE(ign->fb_tunnel_dev, NULL); 419 dst_cache_reset(&t->dst_cache); 420 dev_put(dev); 421 } 422 423 424 static int ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 425 u8 type, u8 code, int offset, __be32 info) 426 { 427 struct net *net = dev_net(skb->dev); 428 const struct ipv6hdr *ipv6h; 429 struct tnl_ptk_info tpi; 430 struct ip6_tnl *t; 431 432 if (gre_parse_header(skb, &tpi, NULL, htons(ETH_P_IPV6), 433 offset) < 0) 434 return -EINVAL; 435 436 ipv6h = (const struct ipv6hdr *)skb->data; 437 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr, 438 tpi.key, tpi.proto); 439 if (!t) 440 return -ENOENT; 441 442 switch (type) { 443 case ICMPV6_DEST_UNREACH: 444 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n", 445 t->parms.name); 446 if (code != ICMPV6_PORT_UNREACH) 447 break; 448 return 0; 449 case ICMPV6_TIME_EXCEED: 450 if (code == ICMPV6_EXC_HOPLIMIT) { 451 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n", 452 t->parms.name); 453 break; 454 } 455 return 0; 456 case ICMPV6_PARAMPROB: { 457 struct ipv6_tlv_tnl_enc_lim *tel; 458 __u32 teli; 459 460 teli = 0; 461 if (code == ICMPV6_HDR_FIELD) 462 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data); 463 464 if (teli && teli == be32_to_cpu(info) - 2) { 465 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli]; 466 if (tel->encap_limit == 0) { 467 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n", 468 t->parms.name); 469 } 470 } else { 471 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n", 472 t->parms.name); 473 } 474 return 0; 475 } 476 case ICMPV6_PKT_TOOBIG: 477 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL)); 478 return 0; 479 case NDISC_REDIRECT: 480 ip6_redirect(skb, net, skb->dev->ifindex, 0, 481 sock_net_uid(net, NULL)); 482 return 0; 483 } 484 485 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO)) 486 t->err_count++; 487 else 488 t->err_count = 1; 489 t->err_time = jiffies; 490 491 return 0; 492 } 493 494 static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi) 495 { 496 const struct ipv6hdr *ipv6h; 497 struct ip6_tnl *tunnel; 498 499 ipv6h = ipv6_hdr(skb); 500 tunnel = ip6gre_tunnel_lookup(skb->dev, 501 &ipv6h->saddr, &ipv6h->daddr, tpi->key, 502 tpi->proto); 503 if (tunnel) { 504 if (tunnel->parms.collect_md) { 505 struct metadata_dst *tun_dst; 506 __be64 tun_id; 507 __be16 flags; 508 509 flags = tpi->flags; 510 tun_id = key32_to_tunnel_id(tpi->key); 511 512 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id, 0); 513 if (!tun_dst) 514 return PACKET_REJECT; 515 516 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error); 517 } else { 518 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error); 519 } 520 521 return PACKET_RCVD; 522 } 523 524 return PACKET_REJECT; 525 } 526 527 static int ip6erspan_rcv(struct sk_buff *skb, 528 struct tnl_ptk_info *tpi, 529 int gre_hdr_len) 530 { 531 struct erspan_base_hdr *ershdr; 532 const struct ipv6hdr *ipv6h; 533 struct erspan_md2 *md2; 534 struct ip6_tnl *tunnel; 535 u8 ver; 536 537 ipv6h = ipv6_hdr(skb); 538 ershdr = (struct erspan_base_hdr *)skb->data; 539 ver = ershdr->ver; 540 541 tunnel = ip6gre_tunnel_lookup(skb->dev, 542 &ipv6h->saddr, &ipv6h->daddr, tpi->key, 543 tpi->proto); 544 if (tunnel) { 545 int len = erspan_hdr_len(ver); 546 547 if (unlikely(!pskb_may_pull(skb, len))) 548 return PACKET_REJECT; 549 550 if (__iptunnel_pull_header(skb, len, 551 htons(ETH_P_TEB), 552 false, false) < 0) 553 return PACKET_REJECT; 554 555 if (tunnel->parms.collect_md) { 556 struct erspan_metadata *pkt_md, *md; 557 struct metadata_dst *tun_dst; 558 struct ip_tunnel_info *info; 559 unsigned char *gh; 560 __be64 tun_id; 561 __be16 flags; 562 563 tpi->flags |= TUNNEL_KEY; 564 flags = tpi->flags; 565 tun_id = key32_to_tunnel_id(tpi->key); 566 567 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id, 568 sizeof(*md)); 569 if (!tun_dst) 570 return PACKET_REJECT; 571 572 /* skb can be uncloned in __iptunnel_pull_header, so 573 * old pkt_md is no longer valid and we need to reset 574 * it 575 */ 576 gh = skb_network_header(skb) + 577 skb_network_header_len(skb); 578 pkt_md = (struct erspan_metadata *)(gh + gre_hdr_len + 579 sizeof(*ershdr)); 580 info = &tun_dst->u.tun_info; 581 md = ip_tunnel_info_opts(info); 582 md->version = ver; 583 md2 = &md->u.md2; 584 memcpy(md2, pkt_md, ver == 1 ? ERSPAN_V1_MDSIZE : 585 ERSPAN_V2_MDSIZE); 586 info->key.tun_flags |= TUNNEL_ERSPAN_OPT; 587 info->options_len = sizeof(*md); 588 589 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error); 590 591 } else { 592 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error); 593 } 594 595 return PACKET_RCVD; 596 } 597 598 return PACKET_REJECT; 599 } 600 601 static int gre_rcv(struct sk_buff *skb) 602 { 603 struct tnl_ptk_info tpi; 604 bool csum_err = false; 605 int hdr_len; 606 607 hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0); 608 if (hdr_len < 0) 609 goto drop; 610 611 if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false)) 612 goto drop; 613 614 if (unlikely(tpi.proto == htons(ETH_P_ERSPAN) || 615 tpi.proto == htons(ETH_P_ERSPAN2))) { 616 if (ip6erspan_rcv(skb, &tpi, hdr_len) == PACKET_RCVD) 617 return 0; 618 goto out; 619 } 620 621 if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD) 622 return 0; 623 624 out: 625 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); 626 drop: 627 kfree_skb(skb); 628 return 0; 629 } 630 631 static int gre_handle_offloads(struct sk_buff *skb, bool csum) 632 { 633 return iptunnel_handle_offloads(skb, 634 csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE); 635 } 636 637 static void prepare_ip6gre_xmit_ipv4(struct sk_buff *skb, 638 struct net_device *dev, 639 struct flowi6 *fl6, __u8 *dsfield, 640 int *encap_limit) 641 { 642 const struct iphdr *iph = ip_hdr(skb); 643 struct ip6_tnl *t = netdev_priv(dev); 644 645 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 646 *encap_limit = t->parms.encap_limit; 647 648 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6)); 649 650 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) 651 *dsfield = ipv4_get_dsfield(iph); 652 else 653 *dsfield = ip6_tclass(t->parms.flowinfo); 654 655 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) 656 fl6->flowi6_mark = skb->mark; 657 else 658 fl6->flowi6_mark = t->parms.fwmark; 659 660 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL); 661 } 662 663 static int prepare_ip6gre_xmit_ipv6(struct sk_buff *skb, 664 struct net_device *dev, 665 struct flowi6 *fl6, __u8 *dsfield, 666 int *encap_limit) 667 { 668 struct ipv6hdr *ipv6h; 669 struct ip6_tnl *t = netdev_priv(dev); 670 __u16 offset; 671 672 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb)); 673 /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */ 674 ipv6h = ipv6_hdr(skb); 675 676 if (offset > 0) { 677 struct ipv6_tlv_tnl_enc_lim *tel; 678 679 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset]; 680 if (tel->encap_limit == 0) { 681 icmpv6_send(skb, ICMPV6_PARAMPROB, 682 ICMPV6_HDR_FIELD, offset + 2); 683 return -1; 684 } 685 *encap_limit = tel->encap_limit - 1; 686 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) { 687 *encap_limit = t->parms.encap_limit; 688 } 689 690 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6)); 691 692 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) 693 *dsfield = ipv6_get_dsfield(ipv6h); 694 else 695 *dsfield = ip6_tclass(t->parms.flowinfo); 696 697 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL) 698 fl6->flowlabel |= ip6_flowlabel(ipv6h); 699 700 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) 701 fl6->flowi6_mark = skb->mark; 702 else 703 fl6->flowi6_mark = t->parms.fwmark; 704 705 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL); 706 707 return 0; 708 } 709 710 static netdev_tx_t __gre6_xmit(struct sk_buff *skb, 711 struct net_device *dev, __u8 dsfield, 712 struct flowi6 *fl6, int encap_limit, 713 __u32 *pmtu, __be16 proto) 714 { 715 struct ip6_tnl *tunnel = netdev_priv(dev); 716 __be16 protocol; 717 718 if (dev->type == ARPHRD_ETHER) 719 IPCB(skb)->flags = 0; 720 721 if (dev->header_ops && dev->type == ARPHRD_IP6GRE) 722 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr; 723 else 724 fl6->daddr = tunnel->parms.raddr; 725 726 if (skb_cow_head(skb, dev->needed_headroom ?: tunnel->hlen)) 727 return -ENOMEM; 728 729 /* Push GRE header. */ 730 protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto; 731 732 if (tunnel->parms.collect_md) { 733 struct ip_tunnel_info *tun_info; 734 const struct ip_tunnel_key *key; 735 __be16 flags; 736 737 tun_info = skb_tunnel_info(skb); 738 if (unlikely(!tun_info || 739 !(tun_info->mode & IP_TUNNEL_INFO_TX) || 740 ip_tunnel_info_af(tun_info) != AF_INET6)) 741 return -EINVAL; 742 743 key = &tun_info->key; 744 memset(fl6, 0, sizeof(*fl6)); 745 fl6->flowi6_proto = IPPROTO_GRE; 746 fl6->daddr = key->u.ipv6.dst; 747 fl6->flowlabel = key->label; 748 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL); 749 750 dsfield = key->tos; 751 flags = key->tun_flags & 752 (TUNNEL_CSUM | TUNNEL_KEY | TUNNEL_SEQ); 753 tunnel->tun_hlen = gre_calc_hlen(flags); 754 755 gre_build_header(skb, tunnel->tun_hlen, 756 flags, protocol, 757 tunnel_id_to_key32(tun_info->key.tun_id), 758 (flags & TUNNEL_SEQ) ? htonl(tunnel->o_seqno++) 759 : 0); 760 761 } else { 762 if (tunnel->parms.o_flags & TUNNEL_SEQ) 763 tunnel->o_seqno++; 764 765 gre_build_header(skb, tunnel->tun_hlen, tunnel->parms.o_flags, 766 protocol, tunnel->parms.o_key, 767 htonl(tunnel->o_seqno)); 768 } 769 770 return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu, 771 NEXTHDR_GRE); 772 } 773 774 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev) 775 { 776 struct ip6_tnl *t = netdev_priv(dev); 777 int encap_limit = -1; 778 struct flowi6 fl6; 779 __u8 dsfield = 0; 780 __u32 mtu; 781 int err; 782 783 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); 784 785 if (!t->parms.collect_md) 786 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6, 787 &dsfield, &encap_limit); 788 789 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)); 790 if (err) 791 return -1; 792 793 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, 794 skb->protocol); 795 if (err != 0) { 796 /* XXX: send ICMP error even if DF is not set. */ 797 if (err == -EMSGSIZE) 798 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, 799 htonl(mtu)); 800 return -1; 801 } 802 803 return 0; 804 } 805 806 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev) 807 { 808 struct ip6_tnl *t = netdev_priv(dev); 809 struct ipv6hdr *ipv6h = ipv6_hdr(skb); 810 int encap_limit = -1; 811 struct flowi6 fl6; 812 __u8 dsfield = 0; 813 __u32 mtu; 814 int err; 815 816 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr)) 817 return -1; 818 819 if (!t->parms.collect_md && 820 prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, &dsfield, &encap_limit)) 821 return -1; 822 823 if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM))) 824 return -1; 825 826 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, 827 &mtu, skb->protocol); 828 if (err != 0) { 829 if (err == -EMSGSIZE) 830 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 831 return -1; 832 } 833 834 return 0; 835 } 836 837 /** 838 * ip6gre_tnl_addr_conflict - compare packet addresses to tunnel's own 839 * @t: the outgoing tunnel device 840 * @hdr: IPv6 header from the incoming packet 841 * 842 * Description: 843 * Avoid trivial tunneling loop by checking that tunnel exit-point 844 * doesn't match source of incoming packet. 845 * 846 * Return: 847 * 1 if conflict, 848 * 0 else 849 **/ 850 851 static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t, 852 const struct ipv6hdr *hdr) 853 { 854 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); 855 } 856 857 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev) 858 { 859 struct ip6_tnl *t = netdev_priv(dev); 860 int encap_limit = -1; 861 struct flowi6 fl6; 862 __u32 mtu; 863 int err; 864 865 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 866 encap_limit = t->parms.encap_limit; 867 868 if (!t->parms.collect_md) 869 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); 870 871 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)); 872 if (err) 873 return err; 874 875 err = __gre6_xmit(skb, dev, 0, &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 ip6_tnl *t = netdev_priv(dev); 884 struct net_device_stats *stats = &t->dev->stats; 885 int ret; 886 887 if (!pskb_inet_may_pull(skb)) 888 goto tx_err; 889 890 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr)) 891 goto tx_err; 892 893 switch (skb->protocol) { 894 case htons(ETH_P_IP): 895 ret = ip6gre_xmit_ipv4(skb, dev); 896 break; 897 case htons(ETH_P_IPV6): 898 ret = ip6gre_xmit_ipv6(skb, dev); 899 break; 900 default: 901 ret = ip6gre_xmit_other(skb, dev); 902 break; 903 } 904 905 if (ret < 0) 906 goto tx_err; 907 908 return NETDEV_TX_OK; 909 910 tx_err: 911 stats->tx_errors++; 912 stats->tx_dropped++; 913 kfree_skb(skb); 914 return NETDEV_TX_OK; 915 } 916 917 static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb, 918 struct net_device *dev) 919 { 920 struct ip6_tnl *t = netdev_priv(dev); 921 struct dst_entry *dst = skb_dst(skb); 922 struct net_device_stats *stats; 923 bool truncate = false; 924 int encap_limit = -1; 925 __u8 dsfield = false; 926 struct flowi6 fl6; 927 int err = -EINVAL; 928 __be16 proto; 929 __u32 mtu; 930 int nhoff; 931 int thoff; 932 933 if (!pskb_inet_may_pull(skb)) 934 goto tx_err; 935 936 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr)) 937 goto tx_err; 938 939 if (gre_handle_offloads(skb, false)) 940 goto tx_err; 941 942 if (skb->len > dev->mtu + dev->hard_header_len) { 943 pskb_trim(skb, dev->mtu + dev->hard_header_len); 944 truncate = true; 945 } 946 947 nhoff = skb_network_header(skb) - skb_mac_header(skb); 948 if (skb->protocol == htons(ETH_P_IP) && 949 (ntohs(ip_hdr(skb)->tot_len) > skb->len - nhoff)) 950 truncate = true; 951 952 thoff = skb_transport_header(skb) - skb_mac_header(skb); 953 if (skb->protocol == htons(ETH_P_IPV6) && 954 (ntohs(ipv6_hdr(skb)->payload_len) > skb->len - thoff)) 955 truncate = true; 956 957 if (skb_cow_head(skb, dev->needed_headroom ?: t->hlen)) 958 goto tx_err; 959 960 t->parms.o_flags &= ~TUNNEL_KEY; 961 IPCB(skb)->flags = 0; 962 963 /* For collect_md mode, derive fl6 from the tunnel key, 964 * for native mode, call prepare_ip6gre_xmit_{ipv4,ipv6}. 965 */ 966 if (t->parms.collect_md) { 967 struct ip_tunnel_info *tun_info; 968 const struct ip_tunnel_key *key; 969 struct erspan_metadata *md; 970 __be32 tun_id; 971 972 tun_info = skb_tunnel_info(skb); 973 if (unlikely(!tun_info || 974 !(tun_info->mode & IP_TUNNEL_INFO_TX) || 975 ip_tunnel_info_af(tun_info) != AF_INET6)) 976 goto tx_err; 977 978 key = &tun_info->key; 979 memset(&fl6, 0, sizeof(fl6)); 980 fl6.flowi6_proto = IPPROTO_GRE; 981 fl6.daddr = key->u.ipv6.dst; 982 fl6.flowlabel = key->label; 983 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL); 984 985 dsfield = key->tos; 986 if (!(tun_info->key.tun_flags & TUNNEL_ERSPAN_OPT)) 987 goto tx_err; 988 if (tun_info->options_len < sizeof(*md)) 989 goto tx_err; 990 md = ip_tunnel_info_opts(tun_info); 991 992 tun_id = tunnel_id_to_key32(key->tun_id); 993 if (md->version == 1) { 994 erspan_build_header(skb, 995 ntohl(tun_id), 996 ntohl(md->u.index), truncate, 997 false); 998 } else if (md->version == 2) { 999 erspan_build_header_v2(skb, 1000 ntohl(tun_id), 1001 md->u.md2.dir, 1002 get_hwid(&md->u.md2), 1003 truncate, false); 1004 } else { 1005 goto tx_err; 1006 } 1007 } else { 1008 switch (skb->protocol) { 1009 case htons(ETH_P_IP): 1010 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); 1011 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6, 1012 &dsfield, &encap_limit); 1013 break; 1014 case htons(ETH_P_IPV6): 1015 if (ipv6_addr_equal(&t->parms.raddr, &ipv6_hdr(skb)->saddr)) 1016 goto tx_err; 1017 if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, 1018 &dsfield, &encap_limit)) 1019 goto tx_err; 1020 break; 1021 default: 1022 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); 1023 break; 1024 } 1025 1026 if (t->parms.erspan_ver == 1) 1027 erspan_build_header(skb, ntohl(t->parms.o_key), 1028 t->parms.index, 1029 truncate, false); 1030 else if (t->parms.erspan_ver == 2) 1031 erspan_build_header_v2(skb, ntohl(t->parms.o_key), 1032 t->parms.dir, 1033 t->parms.hwid, 1034 truncate, false); 1035 else 1036 goto tx_err; 1037 1038 fl6.daddr = t->parms.raddr; 1039 } 1040 1041 /* Push GRE header. */ 1042 proto = (t->parms.erspan_ver == 1) ? htons(ETH_P_ERSPAN) 1043 : htons(ETH_P_ERSPAN2); 1044 gre_build_header(skb, 8, TUNNEL_SEQ, proto, 0, htonl(t->o_seqno++)); 1045 1046 /* TooBig packet may have updated dst->dev's mtu */ 1047 if (!t->parms.collect_md && dst && dst_mtu(dst) > dst->dev->mtu) 1048 dst->ops->update_pmtu(dst, NULL, skb, dst->dev->mtu, false); 1049 1050 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, 1051 NEXTHDR_GRE); 1052 if (err != 0) { 1053 /* XXX: send ICMP error even if DF is not set. */ 1054 if (err == -EMSGSIZE) { 1055 if (skb->protocol == htons(ETH_P_IP)) 1056 icmp_send(skb, ICMP_DEST_UNREACH, 1057 ICMP_FRAG_NEEDED, htonl(mtu)); 1058 else 1059 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 1060 } 1061 1062 goto tx_err; 1063 } 1064 return NETDEV_TX_OK; 1065 1066 tx_err: 1067 stats = &t->dev->stats; 1068 stats->tx_errors++; 1069 stats->tx_dropped++; 1070 kfree_skb(skb); 1071 return NETDEV_TX_OK; 1072 } 1073 1074 static void ip6gre_tnl_link_config_common(struct ip6_tnl *t) 1075 { 1076 struct net_device *dev = t->dev; 1077 struct __ip6_tnl_parm *p = &t->parms; 1078 struct flowi6 *fl6 = &t->fl.u.ip6; 1079 1080 if (dev->type != ARPHRD_ETHER) { 1081 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); 1082 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); 1083 } 1084 1085 /* Set up flowi template */ 1086 fl6->saddr = p->laddr; 1087 fl6->daddr = p->raddr; 1088 fl6->flowi6_oif = p->link; 1089 fl6->flowlabel = 0; 1090 fl6->flowi6_proto = IPPROTO_GRE; 1091 1092 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) 1093 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; 1094 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) 1095 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; 1096 1097 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET); 1098 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr); 1099 1100 if (p->flags&IP6_TNL_F_CAP_XMIT && 1101 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER) 1102 dev->flags |= IFF_POINTOPOINT; 1103 else 1104 dev->flags &= ~IFF_POINTOPOINT; 1105 } 1106 1107 static void ip6gre_tnl_link_config_route(struct ip6_tnl *t, int set_mtu, 1108 int t_hlen) 1109 { 1110 const struct __ip6_tnl_parm *p = &t->parms; 1111 struct net_device *dev = t->dev; 1112 1113 if (p->flags & IP6_TNL_F_CAP_XMIT) { 1114 int strict = (ipv6_addr_type(&p->raddr) & 1115 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); 1116 1117 struct rt6_info *rt = rt6_lookup(t->net, 1118 &p->raddr, &p->laddr, 1119 p->link, NULL, strict); 1120 1121 if (!rt) 1122 return; 1123 1124 if (rt->dst.dev) { 1125 dev->needed_headroom = rt->dst.dev->hard_header_len + 1126 t_hlen; 1127 1128 if (set_mtu) { 1129 dev->mtu = rt->dst.dev->mtu - t_hlen; 1130 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1131 dev->mtu -= 8; 1132 if (dev->type == ARPHRD_ETHER) 1133 dev->mtu -= ETH_HLEN; 1134 1135 if (dev->mtu < IPV6_MIN_MTU) 1136 dev->mtu = IPV6_MIN_MTU; 1137 } 1138 } 1139 ip6_rt_put(rt); 1140 } 1141 } 1142 1143 static int ip6gre_calc_hlen(struct ip6_tnl *tunnel) 1144 { 1145 int t_hlen; 1146 1147 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags); 1148 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen; 1149 1150 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr); 1151 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen; 1152 return t_hlen; 1153 } 1154 1155 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu) 1156 { 1157 ip6gre_tnl_link_config_common(t); 1158 ip6gre_tnl_link_config_route(t, set_mtu, ip6gre_calc_hlen(t)); 1159 } 1160 1161 static void ip6gre_tnl_copy_tnl_parm(struct ip6_tnl *t, 1162 const struct __ip6_tnl_parm *p) 1163 { 1164 t->parms.laddr = p->laddr; 1165 t->parms.raddr = p->raddr; 1166 t->parms.flags = p->flags; 1167 t->parms.hop_limit = p->hop_limit; 1168 t->parms.encap_limit = p->encap_limit; 1169 t->parms.flowinfo = p->flowinfo; 1170 t->parms.link = p->link; 1171 t->parms.proto = p->proto; 1172 t->parms.i_key = p->i_key; 1173 t->parms.o_key = p->o_key; 1174 t->parms.i_flags = p->i_flags; 1175 t->parms.o_flags = p->o_flags; 1176 t->parms.fwmark = p->fwmark; 1177 t->parms.erspan_ver = p->erspan_ver; 1178 t->parms.index = p->index; 1179 t->parms.dir = p->dir; 1180 t->parms.hwid = p->hwid; 1181 dst_cache_reset(&t->dst_cache); 1182 } 1183 1184 static int ip6gre_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p, 1185 int set_mtu) 1186 { 1187 ip6gre_tnl_copy_tnl_parm(t, p); 1188 ip6gre_tnl_link_config(t, set_mtu); 1189 return 0; 1190 } 1191 1192 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p, 1193 const struct ip6_tnl_parm2 *u) 1194 { 1195 p->laddr = u->laddr; 1196 p->raddr = u->raddr; 1197 p->flags = u->flags; 1198 p->hop_limit = u->hop_limit; 1199 p->encap_limit = u->encap_limit; 1200 p->flowinfo = u->flowinfo; 1201 p->link = u->link; 1202 p->i_key = u->i_key; 1203 p->o_key = u->o_key; 1204 p->i_flags = gre_flags_to_tnl_flags(u->i_flags); 1205 p->o_flags = gre_flags_to_tnl_flags(u->o_flags); 1206 memcpy(p->name, u->name, sizeof(u->name)); 1207 } 1208 1209 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u, 1210 const struct __ip6_tnl_parm *p) 1211 { 1212 u->proto = IPPROTO_GRE; 1213 u->laddr = p->laddr; 1214 u->raddr = p->raddr; 1215 u->flags = p->flags; 1216 u->hop_limit = p->hop_limit; 1217 u->encap_limit = p->encap_limit; 1218 u->flowinfo = p->flowinfo; 1219 u->link = p->link; 1220 u->i_key = p->i_key; 1221 u->o_key = p->o_key; 1222 u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags); 1223 u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags); 1224 memcpy(u->name, p->name, sizeof(u->name)); 1225 } 1226 1227 static int ip6gre_tunnel_ioctl(struct net_device *dev, 1228 struct ifreq *ifr, int cmd) 1229 { 1230 int err = 0; 1231 struct ip6_tnl_parm2 p; 1232 struct __ip6_tnl_parm p1; 1233 struct ip6_tnl *t = netdev_priv(dev); 1234 struct net *net = t->net; 1235 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1236 1237 memset(&p1, 0, sizeof(p1)); 1238 1239 switch (cmd) { 1240 case SIOCGETTUNNEL: 1241 if (dev == ign->fb_tunnel_dev) { 1242 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { 1243 err = -EFAULT; 1244 break; 1245 } 1246 ip6gre_tnl_parm_from_user(&p1, &p); 1247 t = ip6gre_tunnel_locate(net, &p1, 0); 1248 if (!t) 1249 t = netdev_priv(dev); 1250 } 1251 memset(&p, 0, sizeof(p)); 1252 ip6gre_tnl_parm_to_user(&p, &t->parms); 1253 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) 1254 err = -EFAULT; 1255 break; 1256 1257 case SIOCADDTUNNEL: 1258 case SIOCCHGTUNNEL: 1259 err = -EPERM; 1260 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1261 goto done; 1262 1263 err = -EFAULT; 1264 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 1265 goto done; 1266 1267 err = -EINVAL; 1268 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING)) 1269 goto done; 1270 1271 if (!(p.i_flags&GRE_KEY)) 1272 p.i_key = 0; 1273 if (!(p.o_flags&GRE_KEY)) 1274 p.o_key = 0; 1275 1276 ip6gre_tnl_parm_from_user(&p1, &p); 1277 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL); 1278 1279 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { 1280 if (t) { 1281 if (t->dev != dev) { 1282 err = -EEXIST; 1283 break; 1284 } 1285 } else { 1286 t = netdev_priv(dev); 1287 1288 ip6gre_tunnel_unlink(ign, t); 1289 synchronize_net(); 1290 ip6gre_tnl_change(t, &p1, 1); 1291 ip6gre_tunnel_link(ign, t); 1292 netdev_state_change(dev); 1293 } 1294 } 1295 1296 if (t) { 1297 err = 0; 1298 1299 memset(&p, 0, sizeof(p)); 1300 ip6gre_tnl_parm_to_user(&p, &t->parms); 1301 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) 1302 err = -EFAULT; 1303 } else 1304 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); 1305 break; 1306 1307 case SIOCDELTUNNEL: 1308 err = -EPERM; 1309 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1310 goto done; 1311 1312 if (dev == ign->fb_tunnel_dev) { 1313 err = -EFAULT; 1314 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 1315 goto done; 1316 err = -ENOENT; 1317 ip6gre_tnl_parm_from_user(&p1, &p); 1318 t = ip6gre_tunnel_locate(net, &p1, 0); 1319 if (!t) 1320 goto done; 1321 err = -EPERM; 1322 if (t == netdev_priv(ign->fb_tunnel_dev)) 1323 goto done; 1324 dev = t->dev; 1325 } 1326 unregister_netdevice(dev); 1327 err = 0; 1328 break; 1329 1330 default: 1331 err = -EINVAL; 1332 } 1333 1334 done: 1335 return err; 1336 } 1337 1338 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev, 1339 unsigned short type, const void *daddr, 1340 const void *saddr, unsigned int len) 1341 { 1342 struct ip6_tnl *t = netdev_priv(dev); 1343 struct ipv6hdr *ipv6h; 1344 __be16 *p; 1345 1346 ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h)); 1347 ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb, 1348 t->fl.u.ip6.flowlabel, 1349 true, &t->fl.u.ip6)); 1350 ipv6h->hop_limit = t->parms.hop_limit; 1351 ipv6h->nexthdr = NEXTHDR_GRE; 1352 ipv6h->saddr = t->parms.laddr; 1353 ipv6h->daddr = t->parms.raddr; 1354 1355 p = (__be16 *)(ipv6h + 1); 1356 p[0] = t->parms.o_flags; 1357 p[1] = htons(type); 1358 1359 /* 1360 * Set the source hardware address. 1361 */ 1362 1363 if (saddr) 1364 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr)); 1365 if (daddr) 1366 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr)); 1367 if (!ipv6_addr_any(&ipv6h->daddr)) 1368 return t->hlen; 1369 1370 return -t->hlen; 1371 } 1372 1373 static const struct header_ops ip6gre_header_ops = { 1374 .create = ip6gre_header, 1375 }; 1376 1377 static const struct net_device_ops ip6gre_netdev_ops = { 1378 .ndo_init = ip6gre_tunnel_init, 1379 .ndo_uninit = ip6gre_tunnel_uninit, 1380 .ndo_start_xmit = ip6gre_tunnel_xmit, 1381 .ndo_do_ioctl = ip6gre_tunnel_ioctl, 1382 .ndo_change_mtu = ip6_tnl_change_mtu, 1383 .ndo_get_stats64 = ip_tunnel_get_stats64, 1384 .ndo_get_iflink = ip6_tnl_get_iflink, 1385 }; 1386 1387 static void ip6gre_dev_free(struct net_device *dev) 1388 { 1389 struct ip6_tnl *t = netdev_priv(dev); 1390 1391 gro_cells_destroy(&t->gro_cells); 1392 dst_cache_destroy(&t->dst_cache); 1393 free_percpu(dev->tstats); 1394 } 1395 1396 static void ip6gre_tunnel_setup(struct net_device *dev) 1397 { 1398 dev->netdev_ops = &ip6gre_netdev_ops; 1399 dev->needs_free_netdev = true; 1400 dev->priv_destructor = ip6gre_dev_free; 1401 1402 dev->type = ARPHRD_IP6GRE; 1403 1404 dev->flags |= IFF_NOARP; 1405 dev->addr_len = sizeof(struct in6_addr); 1406 netif_keep_dst(dev); 1407 /* This perm addr will be used as interface identifier by IPv6 */ 1408 dev->addr_assign_type = NET_ADDR_RANDOM; 1409 eth_random_addr(dev->perm_addr); 1410 } 1411 1412 #define GRE6_FEATURES (NETIF_F_SG | \ 1413 NETIF_F_FRAGLIST | \ 1414 NETIF_F_HIGHDMA | \ 1415 NETIF_F_HW_CSUM) 1416 1417 static void ip6gre_tnl_init_features(struct net_device *dev) 1418 { 1419 struct ip6_tnl *nt = netdev_priv(dev); 1420 1421 dev->features |= GRE6_FEATURES; 1422 dev->hw_features |= GRE6_FEATURES; 1423 1424 if (!(nt->parms.o_flags & TUNNEL_SEQ)) { 1425 /* TCP offload with GRE SEQ is not supported, nor 1426 * can we support 2 levels of outer headers requiring 1427 * an update. 1428 */ 1429 if (!(nt->parms.o_flags & TUNNEL_CSUM) || 1430 nt->encap.type == TUNNEL_ENCAP_NONE) { 1431 dev->features |= NETIF_F_GSO_SOFTWARE; 1432 dev->hw_features |= NETIF_F_GSO_SOFTWARE; 1433 } 1434 1435 /* Can use a lockless transmit, unless we generate 1436 * output sequences 1437 */ 1438 dev->features |= NETIF_F_LLTX; 1439 } 1440 } 1441 1442 static int ip6gre_tunnel_init_common(struct net_device *dev) 1443 { 1444 struct ip6_tnl *tunnel; 1445 int ret; 1446 int t_hlen; 1447 1448 tunnel = netdev_priv(dev); 1449 1450 tunnel->dev = dev; 1451 tunnel->net = dev_net(dev); 1452 strcpy(tunnel->parms.name, dev->name); 1453 1454 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 1455 if (!dev->tstats) 1456 return -ENOMEM; 1457 1458 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); 1459 if (ret) 1460 goto cleanup_alloc_pcpu_stats; 1461 1462 ret = gro_cells_init(&tunnel->gro_cells, dev); 1463 if (ret) 1464 goto cleanup_dst_cache_init; 1465 1466 t_hlen = ip6gre_calc_hlen(tunnel); 1467 dev->mtu = ETH_DATA_LEN - t_hlen; 1468 if (dev->type == ARPHRD_ETHER) 1469 dev->mtu -= ETH_HLEN; 1470 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1471 dev->mtu -= 8; 1472 1473 if (tunnel->parms.collect_md) { 1474 netif_keep_dst(dev); 1475 } 1476 ip6gre_tnl_init_features(dev); 1477 1478 return 0; 1479 1480 cleanup_dst_cache_init: 1481 dst_cache_destroy(&tunnel->dst_cache); 1482 cleanup_alloc_pcpu_stats: 1483 free_percpu(dev->tstats); 1484 dev->tstats = NULL; 1485 return ret; 1486 } 1487 1488 static int ip6gre_tunnel_init(struct net_device *dev) 1489 { 1490 struct ip6_tnl *tunnel; 1491 int ret; 1492 1493 ret = ip6gre_tunnel_init_common(dev); 1494 if (ret) 1495 return ret; 1496 1497 tunnel = netdev_priv(dev); 1498 1499 if (tunnel->parms.collect_md) 1500 return 0; 1501 1502 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr)); 1503 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr)); 1504 1505 if (ipv6_addr_any(&tunnel->parms.raddr)) 1506 dev->header_ops = &ip6gre_header_ops; 1507 1508 return 0; 1509 } 1510 1511 static void ip6gre_fb_tunnel_init(struct net_device *dev) 1512 { 1513 struct ip6_tnl *tunnel = netdev_priv(dev); 1514 1515 tunnel->dev = dev; 1516 tunnel->net = dev_net(dev); 1517 strcpy(tunnel->parms.name, dev->name); 1518 1519 tunnel->hlen = sizeof(struct ipv6hdr) + 4; 1520 1521 dev_hold(dev); 1522 } 1523 1524 static struct inet6_protocol ip6gre_protocol __read_mostly = { 1525 .handler = gre_rcv, 1526 .err_handler = ip6gre_err, 1527 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 1528 }; 1529 1530 static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head) 1531 { 1532 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1533 struct net_device *dev, *aux; 1534 int prio; 1535 1536 for_each_netdev_safe(net, dev, aux) 1537 if (dev->rtnl_link_ops == &ip6gre_link_ops || 1538 dev->rtnl_link_ops == &ip6gre_tap_ops || 1539 dev->rtnl_link_ops == &ip6erspan_tap_ops) 1540 unregister_netdevice_queue(dev, head); 1541 1542 for (prio = 0; prio < 4; prio++) { 1543 int h; 1544 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) { 1545 struct ip6_tnl *t; 1546 1547 t = rtnl_dereference(ign->tunnels[prio][h]); 1548 1549 while (t) { 1550 /* If dev is in the same netns, it has already 1551 * been added to the list by the previous loop. 1552 */ 1553 if (!net_eq(dev_net(t->dev), net)) 1554 unregister_netdevice_queue(t->dev, 1555 head); 1556 t = rtnl_dereference(t->next); 1557 } 1558 } 1559 } 1560 } 1561 1562 static int __net_init ip6gre_init_net(struct net *net) 1563 { 1564 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1565 int err; 1566 1567 if (!net_has_fallback_tunnels(net)) 1568 return 0; 1569 ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0", 1570 NET_NAME_UNKNOWN, 1571 ip6gre_tunnel_setup); 1572 if (!ign->fb_tunnel_dev) { 1573 err = -ENOMEM; 1574 goto err_alloc_dev; 1575 } 1576 dev_net_set(ign->fb_tunnel_dev, net); 1577 /* FB netdevice is special: we have one, and only one per netns. 1578 * Allowing to move it to another netns is clearly unsafe. 1579 */ 1580 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL; 1581 1582 1583 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev); 1584 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops; 1585 1586 err = register_netdev(ign->fb_tunnel_dev); 1587 if (err) 1588 goto err_reg_dev; 1589 1590 rcu_assign_pointer(ign->tunnels_wc[0], 1591 netdev_priv(ign->fb_tunnel_dev)); 1592 return 0; 1593 1594 err_reg_dev: 1595 free_netdev(ign->fb_tunnel_dev); 1596 err_alloc_dev: 1597 return err; 1598 } 1599 1600 static void __net_exit ip6gre_exit_batch_net(struct list_head *net_list) 1601 { 1602 struct net *net; 1603 LIST_HEAD(list); 1604 1605 rtnl_lock(); 1606 list_for_each_entry(net, net_list, exit_list) 1607 ip6gre_destroy_tunnels(net, &list); 1608 unregister_netdevice_many(&list); 1609 rtnl_unlock(); 1610 } 1611 1612 static struct pernet_operations ip6gre_net_ops = { 1613 .init = ip6gre_init_net, 1614 .exit_batch = ip6gre_exit_batch_net, 1615 .id = &ip6gre_net_id, 1616 .size = sizeof(struct ip6gre_net), 1617 }; 1618 1619 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[], 1620 struct netlink_ext_ack *extack) 1621 { 1622 __be16 flags; 1623 1624 if (!data) 1625 return 0; 1626 1627 flags = 0; 1628 if (data[IFLA_GRE_IFLAGS]) 1629 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); 1630 if (data[IFLA_GRE_OFLAGS]) 1631 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); 1632 if (flags & (GRE_VERSION|GRE_ROUTING)) 1633 return -EINVAL; 1634 1635 return 0; 1636 } 1637 1638 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[], 1639 struct netlink_ext_ack *extack) 1640 { 1641 struct in6_addr daddr; 1642 1643 if (tb[IFLA_ADDRESS]) { 1644 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 1645 return -EINVAL; 1646 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 1647 return -EADDRNOTAVAIL; 1648 } 1649 1650 if (!data) 1651 goto out; 1652 1653 if (data[IFLA_GRE_REMOTE]) { 1654 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]); 1655 if (ipv6_addr_any(&daddr)) 1656 return -EINVAL; 1657 } 1658 1659 out: 1660 return ip6gre_tunnel_validate(tb, data, extack); 1661 } 1662 1663 static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[], 1664 struct netlink_ext_ack *extack) 1665 { 1666 __be16 flags = 0; 1667 int ret, ver = 0; 1668 1669 if (!data) 1670 return 0; 1671 1672 ret = ip6gre_tap_validate(tb, data, extack); 1673 if (ret) 1674 return ret; 1675 1676 /* ERSPAN should only have GRE sequence and key flag */ 1677 if (data[IFLA_GRE_OFLAGS]) 1678 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); 1679 if (data[IFLA_GRE_IFLAGS]) 1680 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); 1681 if (!data[IFLA_GRE_COLLECT_METADATA] && 1682 flags != (GRE_SEQ | GRE_KEY)) 1683 return -EINVAL; 1684 1685 /* ERSPAN Session ID only has 10-bit. Since we reuse 1686 * 32-bit key field as ID, check it's range. 1687 */ 1688 if (data[IFLA_GRE_IKEY] && 1689 (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK)) 1690 return -EINVAL; 1691 1692 if (data[IFLA_GRE_OKEY] && 1693 (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK)) 1694 return -EINVAL; 1695 1696 if (data[IFLA_GRE_ERSPAN_VER]) { 1697 ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]); 1698 if (ver != 1 && ver != 2) 1699 return -EINVAL; 1700 } 1701 1702 if (ver == 1) { 1703 if (data[IFLA_GRE_ERSPAN_INDEX]) { 1704 u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]); 1705 1706 if (index & ~INDEX_MASK) 1707 return -EINVAL; 1708 } 1709 } else if (ver == 2) { 1710 if (data[IFLA_GRE_ERSPAN_DIR]) { 1711 u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]); 1712 1713 if (dir & ~(DIR_MASK >> DIR_OFFSET)) 1714 return -EINVAL; 1715 } 1716 1717 if (data[IFLA_GRE_ERSPAN_HWID]) { 1718 u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]); 1719 1720 if (hwid & ~(HWID_MASK >> HWID_OFFSET)) 1721 return -EINVAL; 1722 } 1723 } 1724 1725 return 0; 1726 } 1727 1728 static void ip6erspan_set_version(struct nlattr *data[], 1729 struct __ip6_tnl_parm *parms) 1730 { 1731 if (!data) 1732 return; 1733 1734 parms->erspan_ver = 1; 1735 if (data[IFLA_GRE_ERSPAN_VER]) 1736 parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]); 1737 1738 if (parms->erspan_ver == 1) { 1739 if (data[IFLA_GRE_ERSPAN_INDEX]) 1740 parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]); 1741 } else if (parms->erspan_ver == 2) { 1742 if (data[IFLA_GRE_ERSPAN_DIR]) 1743 parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]); 1744 if (data[IFLA_GRE_ERSPAN_HWID]) 1745 parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]); 1746 } 1747 } 1748 1749 static void ip6gre_netlink_parms(struct nlattr *data[], 1750 struct __ip6_tnl_parm *parms) 1751 { 1752 memset(parms, 0, sizeof(*parms)); 1753 1754 if (!data) 1755 return; 1756 1757 if (data[IFLA_GRE_LINK]) 1758 parms->link = nla_get_u32(data[IFLA_GRE_LINK]); 1759 1760 if (data[IFLA_GRE_IFLAGS]) 1761 parms->i_flags = gre_flags_to_tnl_flags( 1762 nla_get_be16(data[IFLA_GRE_IFLAGS])); 1763 1764 if (data[IFLA_GRE_OFLAGS]) 1765 parms->o_flags = gre_flags_to_tnl_flags( 1766 nla_get_be16(data[IFLA_GRE_OFLAGS])); 1767 1768 if (data[IFLA_GRE_IKEY]) 1769 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]); 1770 1771 if (data[IFLA_GRE_OKEY]) 1772 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]); 1773 1774 if (data[IFLA_GRE_LOCAL]) 1775 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]); 1776 1777 if (data[IFLA_GRE_REMOTE]) 1778 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]); 1779 1780 if (data[IFLA_GRE_TTL]) 1781 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]); 1782 1783 if (data[IFLA_GRE_ENCAP_LIMIT]) 1784 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]); 1785 1786 if (data[IFLA_GRE_FLOWINFO]) 1787 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]); 1788 1789 if (data[IFLA_GRE_FLAGS]) 1790 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]); 1791 1792 if (data[IFLA_GRE_FWMARK]) 1793 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]); 1794 1795 if (data[IFLA_GRE_COLLECT_METADATA]) 1796 parms->collect_md = true; 1797 } 1798 1799 static int ip6gre_tap_init(struct net_device *dev) 1800 { 1801 int ret; 1802 1803 ret = ip6gre_tunnel_init_common(dev); 1804 if (ret) 1805 return ret; 1806 1807 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 1808 1809 return 0; 1810 } 1811 1812 static const struct net_device_ops ip6gre_tap_netdev_ops = { 1813 .ndo_init = ip6gre_tap_init, 1814 .ndo_uninit = ip6gre_tunnel_uninit, 1815 .ndo_start_xmit = ip6gre_tunnel_xmit, 1816 .ndo_set_mac_address = eth_mac_addr, 1817 .ndo_validate_addr = eth_validate_addr, 1818 .ndo_change_mtu = ip6_tnl_change_mtu, 1819 .ndo_get_stats64 = ip_tunnel_get_stats64, 1820 .ndo_get_iflink = ip6_tnl_get_iflink, 1821 }; 1822 1823 static int ip6erspan_calc_hlen(struct ip6_tnl *tunnel) 1824 { 1825 int t_hlen; 1826 1827 tunnel->tun_hlen = 8; 1828 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen + 1829 erspan_hdr_len(tunnel->parms.erspan_ver); 1830 1831 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr); 1832 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen; 1833 return t_hlen; 1834 } 1835 1836 static int ip6erspan_tap_init(struct net_device *dev) 1837 { 1838 struct ip6_tnl *tunnel; 1839 int t_hlen; 1840 int ret; 1841 1842 tunnel = netdev_priv(dev); 1843 1844 tunnel->dev = dev; 1845 tunnel->net = dev_net(dev); 1846 strcpy(tunnel->parms.name, dev->name); 1847 1848 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 1849 if (!dev->tstats) 1850 return -ENOMEM; 1851 1852 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); 1853 if (ret) 1854 goto cleanup_alloc_pcpu_stats; 1855 1856 ret = gro_cells_init(&tunnel->gro_cells, dev); 1857 if (ret) 1858 goto cleanup_dst_cache_init; 1859 1860 t_hlen = ip6erspan_calc_hlen(tunnel); 1861 dev->mtu = ETH_DATA_LEN - t_hlen; 1862 if (dev->type == ARPHRD_ETHER) 1863 dev->mtu -= ETH_HLEN; 1864 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1865 dev->mtu -= 8; 1866 1867 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 1868 ip6erspan_tnl_link_config(tunnel, 1); 1869 1870 return 0; 1871 1872 cleanup_dst_cache_init: 1873 dst_cache_destroy(&tunnel->dst_cache); 1874 cleanup_alloc_pcpu_stats: 1875 free_percpu(dev->tstats); 1876 dev->tstats = NULL; 1877 return ret; 1878 } 1879 1880 static const struct net_device_ops ip6erspan_netdev_ops = { 1881 .ndo_init = ip6erspan_tap_init, 1882 .ndo_uninit = ip6erspan_tunnel_uninit, 1883 .ndo_start_xmit = ip6erspan_tunnel_xmit, 1884 .ndo_set_mac_address = eth_mac_addr, 1885 .ndo_validate_addr = eth_validate_addr, 1886 .ndo_change_mtu = ip6_tnl_change_mtu, 1887 .ndo_get_stats64 = ip_tunnel_get_stats64, 1888 .ndo_get_iflink = ip6_tnl_get_iflink, 1889 }; 1890 1891 static void ip6gre_tap_setup(struct net_device *dev) 1892 { 1893 1894 ether_setup(dev); 1895 1896 dev->max_mtu = 0; 1897 dev->netdev_ops = &ip6gre_tap_netdev_ops; 1898 dev->needs_free_netdev = true; 1899 dev->priv_destructor = ip6gre_dev_free; 1900 1901 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1902 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 1903 netif_keep_dst(dev); 1904 } 1905 1906 static bool ip6gre_netlink_encap_parms(struct nlattr *data[], 1907 struct ip_tunnel_encap *ipencap) 1908 { 1909 bool ret = false; 1910 1911 memset(ipencap, 0, sizeof(*ipencap)); 1912 1913 if (!data) 1914 return ret; 1915 1916 if (data[IFLA_GRE_ENCAP_TYPE]) { 1917 ret = true; 1918 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]); 1919 } 1920 1921 if (data[IFLA_GRE_ENCAP_FLAGS]) { 1922 ret = true; 1923 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]); 1924 } 1925 1926 if (data[IFLA_GRE_ENCAP_SPORT]) { 1927 ret = true; 1928 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]); 1929 } 1930 1931 if (data[IFLA_GRE_ENCAP_DPORT]) { 1932 ret = true; 1933 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]); 1934 } 1935 1936 return ret; 1937 } 1938 1939 static int ip6gre_newlink_common(struct net *src_net, struct net_device *dev, 1940 struct nlattr *tb[], struct nlattr *data[], 1941 struct netlink_ext_ack *extack) 1942 { 1943 struct ip6_tnl *nt; 1944 struct ip_tunnel_encap ipencap; 1945 int err; 1946 1947 nt = netdev_priv(dev); 1948 1949 if (ip6gre_netlink_encap_parms(data, &ipencap)) { 1950 int err = ip6_tnl_encap_setup(nt, &ipencap); 1951 1952 if (err < 0) 1953 return err; 1954 } 1955 1956 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS]) 1957 eth_hw_addr_random(dev); 1958 1959 nt->dev = dev; 1960 nt->net = dev_net(dev); 1961 1962 err = register_netdevice(dev); 1963 if (err) 1964 goto out; 1965 1966 if (tb[IFLA_MTU]) 1967 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 1968 1969 dev_hold(dev); 1970 1971 out: 1972 return err; 1973 } 1974 1975 static int ip6gre_newlink(struct net *src_net, struct net_device *dev, 1976 struct nlattr *tb[], struct nlattr *data[], 1977 struct netlink_ext_ack *extack) 1978 { 1979 struct ip6_tnl *nt = netdev_priv(dev); 1980 struct net *net = dev_net(dev); 1981 struct ip6gre_net *ign; 1982 int err; 1983 1984 ip6gre_netlink_parms(data, &nt->parms); 1985 ign = net_generic(net, ip6gre_net_id); 1986 1987 if (nt->parms.collect_md) { 1988 if (rtnl_dereference(ign->collect_md_tun)) 1989 return -EEXIST; 1990 } else { 1991 if (ip6gre_tunnel_find(net, &nt->parms, dev->type)) 1992 return -EEXIST; 1993 } 1994 1995 err = ip6gre_newlink_common(src_net, dev, tb, data, extack); 1996 if (!err) { 1997 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]); 1998 ip6gre_tunnel_link_md(ign, nt); 1999 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt); 2000 } 2001 return err; 2002 } 2003 2004 static struct ip6_tnl * 2005 ip6gre_changelink_common(struct net_device *dev, struct nlattr *tb[], 2006 struct nlattr *data[], struct __ip6_tnl_parm *p_p, 2007 struct netlink_ext_ack *extack) 2008 { 2009 struct ip6_tnl *t, *nt = netdev_priv(dev); 2010 struct net *net = nt->net; 2011 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 2012 struct ip_tunnel_encap ipencap; 2013 2014 if (dev == ign->fb_tunnel_dev) 2015 return ERR_PTR(-EINVAL); 2016 2017 if (ip6gre_netlink_encap_parms(data, &ipencap)) { 2018 int err = ip6_tnl_encap_setup(nt, &ipencap); 2019 2020 if (err < 0) 2021 return ERR_PTR(err); 2022 } 2023 2024 ip6gre_netlink_parms(data, p_p); 2025 2026 t = ip6gre_tunnel_locate(net, p_p, 0); 2027 2028 if (t) { 2029 if (t->dev != dev) 2030 return ERR_PTR(-EEXIST); 2031 } else { 2032 t = nt; 2033 } 2034 2035 return t; 2036 } 2037 2038 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[], 2039 struct nlattr *data[], 2040 struct netlink_ext_ack *extack) 2041 { 2042 struct ip6_tnl *t = netdev_priv(dev); 2043 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id); 2044 struct __ip6_tnl_parm p; 2045 2046 t = ip6gre_changelink_common(dev, tb, data, &p, extack); 2047 if (IS_ERR(t)) 2048 return PTR_ERR(t); 2049 2050 ip6gre_tunnel_unlink_md(ign, t); 2051 ip6gre_tunnel_unlink(ign, t); 2052 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]); 2053 ip6gre_tunnel_link_md(ign, t); 2054 ip6gre_tunnel_link(ign, t); 2055 return 0; 2056 } 2057 2058 static void ip6gre_dellink(struct net_device *dev, struct list_head *head) 2059 { 2060 struct net *net = dev_net(dev); 2061 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 2062 2063 if (dev != ign->fb_tunnel_dev) 2064 unregister_netdevice_queue(dev, head); 2065 } 2066 2067 static size_t ip6gre_get_size(const struct net_device *dev) 2068 { 2069 return 2070 /* IFLA_GRE_LINK */ 2071 nla_total_size(4) + 2072 /* IFLA_GRE_IFLAGS */ 2073 nla_total_size(2) + 2074 /* IFLA_GRE_OFLAGS */ 2075 nla_total_size(2) + 2076 /* IFLA_GRE_IKEY */ 2077 nla_total_size(4) + 2078 /* IFLA_GRE_OKEY */ 2079 nla_total_size(4) + 2080 /* IFLA_GRE_LOCAL */ 2081 nla_total_size(sizeof(struct in6_addr)) + 2082 /* IFLA_GRE_REMOTE */ 2083 nla_total_size(sizeof(struct in6_addr)) + 2084 /* IFLA_GRE_TTL */ 2085 nla_total_size(1) + 2086 /* IFLA_GRE_ENCAP_LIMIT */ 2087 nla_total_size(1) + 2088 /* IFLA_GRE_FLOWINFO */ 2089 nla_total_size(4) + 2090 /* IFLA_GRE_FLAGS */ 2091 nla_total_size(4) + 2092 /* IFLA_GRE_ENCAP_TYPE */ 2093 nla_total_size(2) + 2094 /* IFLA_GRE_ENCAP_FLAGS */ 2095 nla_total_size(2) + 2096 /* IFLA_GRE_ENCAP_SPORT */ 2097 nla_total_size(2) + 2098 /* IFLA_GRE_ENCAP_DPORT */ 2099 nla_total_size(2) + 2100 /* IFLA_GRE_COLLECT_METADATA */ 2101 nla_total_size(0) + 2102 /* IFLA_GRE_FWMARK */ 2103 nla_total_size(4) + 2104 /* IFLA_GRE_ERSPAN_INDEX */ 2105 nla_total_size(4) + 2106 0; 2107 } 2108 2109 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev) 2110 { 2111 struct ip6_tnl *t = netdev_priv(dev); 2112 struct __ip6_tnl_parm *p = &t->parms; 2113 __be16 o_flags = p->o_flags; 2114 2115 if (p->erspan_ver == 1 || p->erspan_ver == 2) { 2116 if (!p->collect_md) 2117 o_flags |= TUNNEL_KEY; 2118 2119 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, p->erspan_ver)) 2120 goto nla_put_failure; 2121 2122 if (p->erspan_ver == 1) { 2123 if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index)) 2124 goto nla_put_failure; 2125 } else { 2126 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, p->dir)) 2127 goto nla_put_failure; 2128 if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, p->hwid)) 2129 goto nla_put_failure; 2130 } 2131 } 2132 2133 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) || 2134 nla_put_be16(skb, IFLA_GRE_IFLAGS, 2135 gre_tnl_flags_to_gre_flags(p->i_flags)) || 2136 nla_put_be16(skb, IFLA_GRE_OFLAGS, 2137 gre_tnl_flags_to_gre_flags(o_flags)) || 2138 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) || 2139 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) || 2140 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) || 2141 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) || 2142 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) || 2143 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) || 2144 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) || 2145 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) || 2146 nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark)) 2147 goto nla_put_failure; 2148 2149 if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE, 2150 t->encap.type) || 2151 nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT, 2152 t->encap.sport) || 2153 nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT, 2154 t->encap.dport) || 2155 nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS, 2156 t->encap.flags)) 2157 goto nla_put_failure; 2158 2159 if (p->collect_md) { 2160 if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA)) 2161 goto nla_put_failure; 2162 } 2163 2164 return 0; 2165 2166 nla_put_failure: 2167 return -EMSGSIZE; 2168 } 2169 2170 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = { 2171 [IFLA_GRE_LINK] = { .type = NLA_U32 }, 2172 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 }, 2173 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 }, 2174 [IFLA_GRE_IKEY] = { .type = NLA_U32 }, 2175 [IFLA_GRE_OKEY] = { .type = NLA_U32 }, 2176 [IFLA_GRE_LOCAL] = { .len = sizeof_field(struct ipv6hdr, saddr) }, 2177 [IFLA_GRE_REMOTE] = { .len = sizeof_field(struct ipv6hdr, daddr) }, 2178 [IFLA_GRE_TTL] = { .type = NLA_U8 }, 2179 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 }, 2180 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 }, 2181 [IFLA_GRE_FLAGS] = { .type = NLA_U32 }, 2182 [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 }, 2183 [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 }, 2184 [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 }, 2185 [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 }, 2186 [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG }, 2187 [IFLA_GRE_FWMARK] = { .type = NLA_U32 }, 2188 [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 }, 2189 [IFLA_GRE_ERSPAN_VER] = { .type = NLA_U8 }, 2190 [IFLA_GRE_ERSPAN_DIR] = { .type = NLA_U8 }, 2191 [IFLA_GRE_ERSPAN_HWID] = { .type = NLA_U16 }, 2192 }; 2193 2194 static void ip6erspan_tap_setup(struct net_device *dev) 2195 { 2196 ether_setup(dev); 2197 2198 dev->max_mtu = 0; 2199 dev->netdev_ops = &ip6erspan_netdev_ops; 2200 dev->needs_free_netdev = true; 2201 dev->priv_destructor = ip6gre_dev_free; 2202 2203 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 2204 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 2205 netif_keep_dst(dev); 2206 } 2207 2208 static int ip6erspan_newlink(struct net *src_net, struct net_device *dev, 2209 struct nlattr *tb[], struct nlattr *data[], 2210 struct netlink_ext_ack *extack) 2211 { 2212 struct ip6_tnl *nt = netdev_priv(dev); 2213 struct net *net = dev_net(dev); 2214 struct ip6gre_net *ign; 2215 int err; 2216 2217 ip6gre_netlink_parms(data, &nt->parms); 2218 ip6erspan_set_version(data, &nt->parms); 2219 ign = net_generic(net, ip6gre_net_id); 2220 2221 if (nt->parms.collect_md) { 2222 if (rtnl_dereference(ign->collect_md_tun_erspan)) 2223 return -EEXIST; 2224 } else { 2225 if (ip6gre_tunnel_find(net, &nt->parms, dev->type)) 2226 return -EEXIST; 2227 } 2228 2229 err = ip6gre_newlink_common(src_net, dev, tb, data, extack); 2230 if (!err) { 2231 ip6erspan_tnl_link_config(nt, !tb[IFLA_MTU]); 2232 ip6erspan_tunnel_link_md(ign, nt); 2233 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt); 2234 } 2235 return err; 2236 } 2237 2238 static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu) 2239 { 2240 ip6gre_tnl_link_config_common(t); 2241 ip6gre_tnl_link_config_route(t, set_mtu, ip6erspan_calc_hlen(t)); 2242 } 2243 2244 static int ip6erspan_tnl_change(struct ip6_tnl *t, 2245 const struct __ip6_tnl_parm *p, int set_mtu) 2246 { 2247 ip6gre_tnl_copy_tnl_parm(t, p); 2248 ip6erspan_tnl_link_config(t, set_mtu); 2249 return 0; 2250 } 2251 2252 static int ip6erspan_changelink(struct net_device *dev, struct nlattr *tb[], 2253 struct nlattr *data[], 2254 struct netlink_ext_ack *extack) 2255 { 2256 struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id); 2257 struct __ip6_tnl_parm p; 2258 struct ip6_tnl *t; 2259 2260 t = ip6gre_changelink_common(dev, tb, data, &p, extack); 2261 if (IS_ERR(t)) 2262 return PTR_ERR(t); 2263 2264 ip6erspan_set_version(data, &p); 2265 ip6gre_tunnel_unlink_md(ign, t); 2266 ip6gre_tunnel_unlink(ign, t); 2267 ip6erspan_tnl_change(t, &p, !tb[IFLA_MTU]); 2268 ip6erspan_tunnel_link_md(ign, t); 2269 ip6gre_tunnel_link(ign, t); 2270 return 0; 2271 } 2272 2273 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = { 2274 .kind = "ip6gre", 2275 .maxtype = IFLA_GRE_MAX, 2276 .policy = ip6gre_policy, 2277 .priv_size = sizeof(struct ip6_tnl), 2278 .setup = ip6gre_tunnel_setup, 2279 .validate = ip6gre_tunnel_validate, 2280 .newlink = ip6gre_newlink, 2281 .changelink = ip6gre_changelink, 2282 .dellink = ip6gre_dellink, 2283 .get_size = ip6gre_get_size, 2284 .fill_info = ip6gre_fill_info, 2285 .get_link_net = ip6_tnl_get_link_net, 2286 }; 2287 2288 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = { 2289 .kind = "ip6gretap", 2290 .maxtype = IFLA_GRE_MAX, 2291 .policy = ip6gre_policy, 2292 .priv_size = sizeof(struct ip6_tnl), 2293 .setup = ip6gre_tap_setup, 2294 .validate = ip6gre_tap_validate, 2295 .newlink = ip6gre_newlink, 2296 .changelink = ip6gre_changelink, 2297 .get_size = ip6gre_get_size, 2298 .fill_info = ip6gre_fill_info, 2299 .get_link_net = ip6_tnl_get_link_net, 2300 }; 2301 2302 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly = { 2303 .kind = "ip6erspan", 2304 .maxtype = IFLA_GRE_MAX, 2305 .policy = ip6gre_policy, 2306 .priv_size = sizeof(struct ip6_tnl), 2307 .setup = ip6erspan_tap_setup, 2308 .validate = ip6erspan_tap_validate, 2309 .newlink = ip6erspan_newlink, 2310 .changelink = ip6erspan_changelink, 2311 .get_size = ip6gre_get_size, 2312 .fill_info = ip6gre_fill_info, 2313 .get_link_net = ip6_tnl_get_link_net, 2314 }; 2315 2316 /* 2317 * And now the modules code and kernel interface. 2318 */ 2319 2320 static int __init ip6gre_init(void) 2321 { 2322 int err; 2323 2324 pr_info("GRE over IPv6 tunneling driver\n"); 2325 2326 err = register_pernet_device(&ip6gre_net_ops); 2327 if (err < 0) 2328 return err; 2329 2330 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE); 2331 if (err < 0) { 2332 pr_info("%s: can't add protocol\n", __func__); 2333 goto add_proto_failed; 2334 } 2335 2336 err = rtnl_link_register(&ip6gre_link_ops); 2337 if (err < 0) 2338 goto rtnl_link_failed; 2339 2340 err = rtnl_link_register(&ip6gre_tap_ops); 2341 if (err < 0) 2342 goto tap_ops_failed; 2343 2344 err = rtnl_link_register(&ip6erspan_tap_ops); 2345 if (err < 0) 2346 goto erspan_link_failed; 2347 2348 out: 2349 return err; 2350 2351 erspan_link_failed: 2352 rtnl_link_unregister(&ip6gre_tap_ops); 2353 tap_ops_failed: 2354 rtnl_link_unregister(&ip6gre_link_ops); 2355 rtnl_link_failed: 2356 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE); 2357 add_proto_failed: 2358 unregister_pernet_device(&ip6gre_net_ops); 2359 goto out; 2360 } 2361 2362 static void __exit ip6gre_fini(void) 2363 { 2364 rtnl_link_unregister(&ip6gre_tap_ops); 2365 rtnl_link_unregister(&ip6gre_link_ops); 2366 rtnl_link_unregister(&ip6erspan_tap_ops); 2367 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE); 2368 unregister_pernet_device(&ip6gre_net_ops); 2369 } 2370 2371 module_init(ip6gre_init); 2372 module_exit(ip6gre_fini); 2373 MODULE_LICENSE("GPL"); 2374 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)"); 2375 MODULE_DESCRIPTION("GRE over IPv6 tunneling device"); 2376 MODULE_ALIAS_RTNL_LINK("ip6gre"); 2377 MODULE_ALIAS_RTNL_LINK("ip6gretap"); 2378 MODULE_ALIAS_RTNL_LINK("ip6erspan"); 2379 MODULE_ALIAS_NETDEV("ip6gre0"); 2380