1 /* 2 * GRE over IPv6 protocol decoder. 3 * 4 * Authors: Dmitry Kozlov (xeb@mail.ru) 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License 8 * as published by the Free Software Foundation; either version 9 * 2 of the License, or (at your option) any later version. 10 * 11 */ 12 13 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 14 15 #include <linux/capability.h> 16 #include <linux/module.h> 17 #include <linux/types.h> 18 #include <linux/kernel.h> 19 #include <linux/slab.h> 20 #include <linux/uaccess.h> 21 #include <linux/skbuff.h> 22 #include <linux/netdevice.h> 23 #include <linux/in.h> 24 #include <linux/tcp.h> 25 #include <linux/udp.h> 26 #include <linux/if_arp.h> 27 #include <linux/init.h> 28 #include <linux/in6.h> 29 #include <linux/inetdevice.h> 30 #include <linux/igmp.h> 31 #include <linux/netfilter_ipv4.h> 32 #include <linux/etherdevice.h> 33 #include <linux/if_ether.h> 34 #include <linux/hash.h> 35 #include <linux/if_tunnel.h> 36 #include <linux/ip6_tunnel.h> 37 38 #include <net/sock.h> 39 #include <net/ip.h> 40 #include <net/ip_tunnels.h> 41 #include <net/icmp.h> 42 #include <net/protocol.h> 43 #include <net/addrconf.h> 44 #include <net/arp.h> 45 #include <net/checksum.h> 46 #include <net/dsfield.h> 47 #include <net/inet_ecn.h> 48 #include <net/xfrm.h> 49 #include <net/net_namespace.h> 50 #include <net/netns/generic.h> 51 #include <net/rtnetlink.h> 52 53 #include <net/ipv6.h> 54 #include <net/ip6_fib.h> 55 #include <net/ip6_route.h> 56 #include <net/ip6_tunnel.h> 57 #include <net/gre.h> 58 #include <net/erspan.h> 59 #include <net/dst_metadata.h> 60 61 62 static bool log_ecn_error = true; 63 module_param(log_ecn_error, bool, 0644); 64 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); 65 66 #define IP6_GRE_HASH_SIZE_SHIFT 5 67 #define IP6_GRE_HASH_SIZE (1 << IP6_GRE_HASH_SIZE_SHIFT) 68 69 static unsigned int ip6gre_net_id __read_mostly; 70 struct ip6gre_net { 71 struct ip6_tnl __rcu *tunnels[4][IP6_GRE_HASH_SIZE]; 72 73 struct ip6_tnl __rcu *collect_md_tun; 74 struct ip6_tnl __rcu *collect_md_tun_erspan; 75 struct net_device *fb_tunnel_dev; 76 }; 77 78 static struct rtnl_link_ops ip6gre_link_ops __read_mostly; 79 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly; 80 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly; 81 static int ip6gre_tunnel_init(struct net_device *dev); 82 static void ip6gre_tunnel_setup(struct net_device *dev); 83 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t); 84 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu); 85 static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu); 86 87 /* Tunnel hash table */ 88 89 /* 90 4 hash tables: 91 92 3: (remote,local) 93 2: (remote,*) 94 1: (*,local) 95 0: (*,*) 96 97 We require exact key match i.e. if a key is present in packet 98 it will match only tunnel with the same key; if it is not present, 99 it will match only keyless tunnel. 100 101 All keysless packets, if not matched configured keyless tunnels 102 will match fallback tunnel. 103 */ 104 105 #define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(IP6_GRE_HASH_SIZE - 1)) 106 static u32 HASH_ADDR(const struct in6_addr *addr) 107 { 108 u32 hash = ipv6_addr_hash(addr); 109 110 return hash_32(hash, IP6_GRE_HASH_SIZE_SHIFT); 111 } 112 113 #define tunnels_r_l tunnels[3] 114 #define tunnels_r tunnels[2] 115 #define tunnels_l tunnels[1] 116 #define tunnels_wc tunnels[0] 117 118 /* Given src, dst and key, find appropriate for input tunnel. */ 119 120 static struct ip6_tnl *ip6gre_tunnel_lookup(struct net_device *dev, 121 const struct in6_addr *remote, const struct in6_addr *local, 122 __be32 key, __be16 gre_proto) 123 { 124 struct net *net = dev_net(dev); 125 int link = dev->ifindex; 126 unsigned int h0 = HASH_ADDR(remote); 127 unsigned int h1 = HASH_KEY(key); 128 struct ip6_tnl *t, *cand = NULL; 129 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 130 int dev_type = (gre_proto == htons(ETH_P_TEB) || 131 gre_proto == htons(ETH_P_ERSPAN) || 132 gre_proto == htons(ETH_P_ERSPAN2)) ? 133 ARPHRD_ETHER : ARPHRD_IP6GRE; 134 int score, cand_score = 4; 135 136 for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) { 137 if (!ipv6_addr_equal(local, &t->parms.laddr) || 138 !ipv6_addr_equal(remote, &t->parms.raddr) || 139 key != t->parms.i_key || 140 !(t->dev->flags & IFF_UP)) 141 continue; 142 143 if (t->dev->type != ARPHRD_IP6GRE && 144 t->dev->type != dev_type) 145 continue; 146 147 score = 0; 148 if (t->parms.link != link) 149 score |= 1; 150 if (t->dev->type != dev_type) 151 score |= 2; 152 if (score == 0) 153 return t; 154 155 if (score < cand_score) { 156 cand = t; 157 cand_score = score; 158 } 159 } 160 161 for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) { 162 if (!ipv6_addr_equal(remote, &t->parms.raddr) || 163 key != t->parms.i_key || 164 !(t->dev->flags & IFF_UP)) 165 continue; 166 167 if (t->dev->type != ARPHRD_IP6GRE && 168 t->dev->type != dev_type) 169 continue; 170 171 score = 0; 172 if (t->parms.link != link) 173 score |= 1; 174 if (t->dev->type != dev_type) 175 score |= 2; 176 if (score == 0) 177 return t; 178 179 if (score < cand_score) { 180 cand = t; 181 cand_score = score; 182 } 183 } 184 185 for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) { 186 if ((!ipv6_addr_equal(local, &t->parms.laddr) && 187 (!ipv6_addr_equal(local, &t->parms.raddr) || 188 !ipv6_addr_is_multicast(local))) || 189 key != t->parms.i_key || 190 !(t->dev->flags & IFF_UP)) 191 continue; 192 193 if (t->dev->type != ARPHRD_IP6GRE && 194 t->dev->type != dev_type) 195 continue; 196 197 score = 0; 198 if (t->parms.link != link) 199 score |= 1; 200 if (t->dev->type != dev_type) 201 score |= 2; 202 if (score == 0) 203 return t; 204 205 if (score < cand_score) { 206 cand = t; 207 cand_score = score; 208 } 209 } 210 211 for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) { 212 if (t->parms.i_key != key || 213 !(t->dev->flags & IFF_UP)) 214 continue; 215 216 if (t->dev->type != ARPHRD_IP6GRE && 217 t->dev->type != dev_type) 218 continue; 219 220 score = 0; 221 if (t->parms.link != link) 222 score |= 1; 223 if (t->dev->type != dev_type) 224 score |= 2; 225 if (score == 0) 226 return t; 227 228 if (score < cand_score) { 229 cand = t; 230 cand_score = score; 231 } 232 } 233 234 if (cand) 235 return cand; 236 237 if (gre_proto == htons(ETH_P_ERSPAN) || 238 gre_proto == htons(ETH_P_ERSPAN2)) 239 t = rcu_dereference(ign->collect_md_tun_erspan); 240 else 241 t = rcu_dereference(ign->collect_md_tun); 242 243 if (t && t->dev->flags & IFF_UP) 244 return t; 245 246 dev = ign->fb_tunnel_dev; 247 if (dev && dev->flags & IFF_UP) 248 return netdev_priv(dev); 249 250 return NULL; 251 } 252 253 static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign, 254 const struct __ip6_tnl_parm *p) 255 { 256 const struct in6_addr *remote = &p->raddr; 257 const struct in6_addr *local = &p->laddr; 258 unsigned int h = HASH_KEY(p->i_key); 259 int prio = 0; 260 261 if (!ipv6_addr_any(local)) 262 prio |= 1; 263 if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) { 264 prio |= 2; 265 h ^= HASH_ADDR(remote); 266 } 267 268 return &ign->tunnels[prio][h]; 269 } 270 271 static void ip6gre_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t) 272 { 273 if (t->parms.collect_md) 274 rcu_assign_pointer(ign->collect_md_tun, t); 275 } 276 277 static void ip6erspan_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t) 278 { 279 if (t->parms.collect_md) 280 rcu_assign_pointer(ign->collect_md_tun_erspan, t); 281 } 282 283 static void ip6gre_tunnel_unlink_md(struct ip6gre_net *ign, struct ip6_tnl *t) 284 { 285 if (t->parms.collect_md) 286 rcu_assign_pointer(ign->collect_md_tun, NULL); 287 } 288 289 static void ip6erspan_tunnel_unlink_md(struct ip6gre_net *ign, 290 struct ip6_tnl *t) 291 { 292 if (t->parms.collect_md) 293 rcu_assign_pointer(ign->collect_md_tun_erspan, NULL); 294 } 295 296 static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign, 297 const struct ip6_tnl *t) 298 { 299 return __ip6gre_bucket(ign, &t->parms); 300 } 301 302 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t) 303 { 304 struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t); 305 306 rcu_assign_pointer(t->next, rtnl_dereference(*tp)); 307 rcu_assign_pointer(*tp, t); 308 } 309 310 static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t) 311 { 312 struct ip6_tnl __rcu **tp; 313 struct ip6_tnl *iter; 314 315 for (tp = ip6gre_bucket(ign, t); 316 (iter = rtnl_dereference(*tp)) != NULL; 317 tp = &iter->next) { 318 if (t == iter) { 319 rcu_assign_pointer(*tp, t->next); 320 break; 321 } 322 } 323 } 324 325 static struct ip6_tnl *ip6gre_tunnel_find(struct net *net, 326 const struct __ip6_tnl_parm *parms, 327 int type) 328 { 329 const struct in6_addr *remote = &parms->raddr; 330 const struct in6_addr *local = &parms->laddr; 331 __be32 key = parms->i_key; 332 int link = parms->link; 333 struct ip6_tnl *t; 334 struct ip6_tnl __rcu **tp; 335 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 336 337 for (tp = __ip6gre_bucket(ign, parms); 338 (t = rtnl_dereference(*tp)) != NULL; 339 tp = &t->next) 340 if (ipv6_addr_equal(local, &t->parms.laddr) && 341 ipv6_addr_equal(remote, &t->parms.raddr) && 342 key == t->parms.i_key && 343 link == t->parms.link && 344 type == t->dev->type) 345 break; 346 347 return t; 348 } 349 350 static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net, 351 const struct __ip6_tnl_parm *parms, int create) 352 { 353 struct ip6_tnl *t, *nt; 354 struct net_device *dev; 355 char name[IFNAMSIZ]; 356 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 357 358 t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE); 359 if (t && create) 360 return NULL; 361 if (t || !create) 362 return t; 363 364 if (parms->name[0]) { 365 if (!dev_valid_name(parms->name)) 366 return NULL; 367 strlcpy(name, parms->name, IFNAMSIZ); 368 } else { 369 strcpy(name, "ip6gre%d"); 370 } 371 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, 372 ip6gre_tunnel_setup); 373 if (!dev) 374 return NULL; 375 376 dev_net_set(dev, net); 377 378 nt = netdev_priv(dev); 379 nt->parms = *parms; 380 dev->rtnl_link_ops = &ip6gre_link_ops; 381 382 nt->dev = dev; 383 nt->net = dev_net(dev); 384 385 if (register_netdevice(dev) < 0) 386 goto failed_free; 387 388 ip6gre_tnl_link_config(nt, 1); 389 390 /* Can use a lockless transmit, unless we generate output sequences */ 391 if (!(nt->parms.o_flags & TUNNEL_SEQ)) 392 dev->features |= NETIF_F_LLTX; 393 394 dev_hold(dev); 395 ip6gre_tunnel_link(ign, nt); 396 return nt; 397 398 failed_free: 399 free_netdev(dev); 400 return NULL; 401 } 402 403 static void ip6erspan_tunnel_uninit(struct net_device *dev) 404 { 405 struct ip6_tnl *t = netdev_priv(dev); 406 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id); 407 408 ip6erspan_tunnel_unlink_md(ign, t); 409 ip6gre_tunnel_unlink(ign, t); 410 dst_cache_reset(&t->dst_cache); 411 dev_put(dev); 412 } 413 414 static void ip6gre_tunnel_uninit(struct net_device *dev) 415 { 416 struct ip6_tnl *t = netdev_priv(dev); 417 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id); 418 419 ip6gre_tunnel_unlink_md(ign, t); 420 ip6gre_tunnel_unlink(ign, t); 421 dst_cache_reset(&t->dst_cache); 422 dev_put(dev); 423 } 424 425 426 static void ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 427 u8 type, u8 code, int offset, __be32 info) 428 { 429 struct net *net = dev_net(skb->dev); 430 const struct gre_base_hdr *greh; 431 const struct ipv6hdr *ipv6h; 432 int grehlen = sizeof(*greh); 433 struct ip6_tnl *t; 434 int key_off = 0; 435 __be16 flags; 436 __be32 key; 437 438 if (!pskb_may_pull(skb, offset + grehlen)) 439 return; 440 greh = (const struct gre_base_hdr *)(skb->data + offset); 441 flags = greh->flags; 442 if (flags & (GRE_VERSION | GRE_ROUTING)) 443 return; 444 if (flags & GRE_CSUM) 445 grehlen += 4; 446 if (flags & GRE_KEY) { 447 key_off = grehlen + offset; 448 grehlen += 4; 449 } 450 451 if (!pskb_may_pull(skb, offset + grehlen)) 452 return; 453 ipv6h = (const struct ipv6hdr *)skb->data; 454 greh = (const struct gre_base_hdr *)(skb->data + offset); 455 key = key_off ? *(__be32 *)(skb->data + key_off) : 0; 456 457 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr, 458 key, greh->protocol); 459 if (!t) 460 return; 461 462 switch (type) { 463 struct ipv6_tlv_tnl_enc_lim *tel; 464 __u32 teli; 465 case ICMPV6_DEST_UNREACH: 466 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n", 467 t->parms.name); 468 if (code != ICMPV6_PORT_UNREACH) 469 break; 470 return; 471 case ICMPV6_TIME_EXCEED: 472 if (code == ICMPV6_EXC_HOPLIMIT) { 473 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n", 474 t->parms.name); 475 break; 476 } 477 return; 478 case ICMPV6_PARAMPROB: 479 teli = 0; 480 if (code == ICMPV6_HDR_FIELD) 481 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data); 482 483 if (teli && teli == be32_to_cpu(info) - 2) { 484 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli]; 485 if (tel->encap_limit == 0) { 486 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n", 487 t->parms.name); 488 } 489 } else { 490 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n", 491 t->parms.name); 492 } 493 return; 494 case ICMPV6_PKT_TOOBIG: 495 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL)); 496 return; 497 case NDISC_REDIRECT: 498 ip6_redirect(skb, net, skb->dev->ifindex, 0, 499 sock_net_uid(net, NULL)); 500 return; 501 } 502 503 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO)) 504 t->err_count++; 505 else 506 t->err_count = 1; 507 t->err_time = jiffies; 508 } 509 510 static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi) 511 { 512 const struct ipv6hdr *ipv6h; 513 struct ip6_tnl *tunnel; 514 515 ipv6h = ipv6_hdr(skb); 516 tunnel = ip6gre_tunnel_lookup(skb->dev, 517 &ipv6h->saddr, &ipv6h->daddr, tpi->key, 518 tpi->proto); 519 if (tunnel) { 520 if (tunnel->parms.collect_md) { 521 struct metadata_dst *tun_dst; 522 __be64 tun_id; 523 __be16 flags; 524 525 flags = tpi->flags; 526 tun_id = key32_to_tunnel_id(tpi->key); 527 528 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id, 0); 529 if (!tun_dst) 530 return PACKET_REJECT; 531 532 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error); 533 } else { 534 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error); 535 } 536 537 return PACKET_RCVD; 538 } 539 540 return PACKET_REJECT; 541 } 542 543 static int ip6erspan_rcv(struct sk_buff *skb, int gre_hdr_len, 544 struct tnl_ptk_info *tpi) 545 { 546 struct erspan_base_hdr *ershdr; 547 struct erspan_metadata *pkt_md; 548 const struct ipv6hdr *ipv6h; 549 struct erspan_md2 *md2; 550 struct ip6_tnl *tunnel; 551 u8 ver; 552 553 if (unlikely(!pskb_may_pull(skb, sizeof(*ershdr)))) 554 return PACKET_REJECT; 555 556 ipv6h = ipv6_hdr(skb); 557 ershdr = (struct erspan_base_hdr *)skb->data; 558 ver = ershdr->ver; 559 tpi->key = cpu_to_be32(get_session_id(ershdr)); 560 561 tunnel = ip6gre_tunnel_lookup(skb->dev, 562 &ipv6h->saddr, &ipv6h->daddr, tpi->key, 563 tpi->proto); 564 if (tunnel) { 565 int len = erspan_hdr_len(ver); 566 567 if (unlikely(!pskb_may_pull(skb, len))) 568 return PACKET_REJECT; 569 570 ershdr = (struct erspan_base_hdr *)skb->data; 571 pkt_md = (struct erspan_metadata *)(ershdr + 1); 572 573 if (__iptunnel_pull_header(skb, len, 574 htons(ETH_P_TEB), 575 false, false) < 0) 576 return PACKET_REJECT; 577 578 if (tunnel->parms.collect_md) { 579 struct metadata_dst *tun_dst; 580 struct ip_tunnel_info *info; 581 struct erspan_metadata *md; 582 __be64 tun_id; 583 __be16 flags; 584 585 tpi->flags |= TUNNEL_KEY; 586 flags = tpi->flags; 587 tun_id = key32_to_tunnel_id(tpi->key); 588 589 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id, 590 sizeof(*md)); 591 if (!tun_dst) 592 return PACKET_REJECT; 593 594 info = &tun_dst->u.tun_info; 595 md = ip_tunnel_info_opts(info); 596 md->version = ver; 597 md2 = &md->u.md2; 598 memcpy(md2, pkt_md, ver == 1 ? ERSPAN_V1_MDSIZE : 599 ERSPAN_V2_MDSIZE); 600 info->key.tun_flags |= TUNNEL_ERSPAN_OPT; 601 info->options_len = sizeof(*md); 602 603 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error); 604 605 } else { 606 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error); 607 } 608 609 return PACKET_RCVD; 610 } 611 612 return PACKET_REJECT; 613 } 614 615 static int gre_rcv(struct sk_buff *skb) 616 { 617 struct tnl_ptk_info tpi; 618 bool csum_err = false; 619 int hdr_len; 620 621 hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0); 622 if (hdr_len < 0) 623 goto drop; 624 625 if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false)) 626 goto drop; 627 628 if (unlikely(tpi.proto == htons(ETH_P_ERSPAN) || 629 tpi.proto == htons(ETH_P_ERSPAN2))) { 630 if (ip6erspan_rcv(skb, hdr_len, &tpi) == PACKET_RCVD) 631 return 0; 632 goto out; 633 } 634 635 if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD) 636 return 0; 637 638 out: 639 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); 640 drop: 641 kfree_skb(skb); 642 return 0; 643 } 644 645 static int gre_handle_offloads(struct sk_buff *skb, bool csum) 646 { 647 return iptunnel_handle_offloads(skb, 648 csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE); 649 } 650 651 static void prepare_ip6gre_xmit_ipv4(struct sk_buff *skb, 652 struct net_device *dev, 653 struct flowi6 *fl6, __u8 *dsfield, 654 int *encap_limit) 655 { 656 const struct iphdr *iph = ip_hdr(skb); 657 struct ip6_tnl *t = netdev_priv(dev); 658 659 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 660 *encap_limit = t->parms.encap_limit; 661 662 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6)); 663 664 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) 665 *dsfield = ipv4_get_dsfield(iph); 666 else 667 *dsfield = ip6_tclass(t->parms.flowinfo); 668 669 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) 670 fl6->flowi6_mark = skb->mark; 671 else 672 fl6->flowi6_mark = t->parms.fwmark; 673 674 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL); 675 } 676 677 static int prepare_ip6gre_xmit_ipv6(struct sk_buff *skb, 678 struct net_device *dev, 679 struct flowi6 *fl6, __u8 *dsfield, 680 int *encap_limit) 681 { 682 struct ipv6hdr *ipv6h = ipv6_hdr(skb); 683 struct ip6_tnl *t = netdev_priv(dev); 684 __u16 offset; 685 686 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb)); 687 /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */ 688 689 if (offset > 0) { 690 struct ipv6_tlv_tnl_enc_lim *tel; 691 692 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset]; 693 if (tel->encap_limit == 0) { 694 icmpv6_send(skb, ICMPV6_PARAMPROB, 695 ICMPV6_HDR_FIELD, offset + 2); 696 return -1; 697 } 698 *encap_limit = tel->encap_limit - 1; 699 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) { 700 *encap_limit = t->parms.encap_limit; 701 } 702 703 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6)); 704 705 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) 706 *dsfield = ipv6_get_dsfield(ipv6h); 707 else 708 *dsfield = ip6_tclass(t->parms.flowinfo); 709 710 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL) 711 fl6->flowlabel |= ip6_flowlabel(ipv6h); 712 713 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) 714 fl6->flowi6_mark = skb->mark; 715 else 716 fl6->flowi6_mark = t->parms.fwmark; 717 718 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL); 719 720 return 0; 721 } 722 723 static netdev_tx_t __gre6_xmit(struct sk_buff *skb, 724 struct net_device *dev, __u8 dsfield, 725 struct flowi6 *fl6, int encap_limit, 726 __u32 *pmtu, __be16 proto) 727 { 728 struct ip6_tnl *tunnel = netdev_priv(dev); 729 __be16 protocol; 730 731 if (dev->type == ARPHRD_ETHER) 732 IPCB(skb)->flags = 0; 733 734 if (dev->header_ops && dev->type == ARPHRD_IP6GRE) 735 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr; 736 else 737 fl6->daddr = tunnel->parms.raddr; 738 739 if (skb_cow_head(skb, dev->needed_headroom ?: tunnel->hlen)) 740 return -ENOMEM; 741 742 /* Push GRE header. */ 743 protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto; 744 745 if (tunnel->parms.collect_md) { 746 struct ip_tunnel_info *tun_info; 747 const struct ip_tunnel_key *key; 748 __be16 flags; 749 750 tun_info = skb_tunnel_info(skb); 751 if (unlikely(!tun_info || 752 !(tun_info->mode & IP_TUNNEL_INFO_TX) || 753 ip_tunnel_info_af(tun_info) != AF_INET6)) 754 return -EINVAL; 755 756 key = &tun_info->key; 757 memset(fl6, 0, sizeof(*fl6)); 758 fl6->flowi6_proto = IPPROTO_GRE; 759 fl6->daddr = key->u.ipv6.dst; 760 fl6->flowlabel = key->label; 761 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL); 762 763 dsfield = key->tos; 764 flags = key->tun_flags & 765 (TUNNEL_CSUM | TUNNEL_KEY | TUNNEL_SEQ); 766 tunnel->tun_hlen = gre_calc_hlen(flags); 767 768 gre_build_header(skb, tunnel->tun_hlen, 769 flags, protocol, 770 tunnel_id_to_key32(tun_info->key.tun_id), 771 (flags & TUNNEL_SEQ) ? htonl(tunnel->o_seqno++) 772 : 0); 773 774 } else { 775 if (tunnel->parms.o_flags & TUNNEL_SEQ) 776 tunnel->o_seqno++; 777 778 gre_build_header(skb, tunnel->tun_hlen, tunnel->parms.o_flags, 779 protocol, tunnel->parms.o_key, 780 htonl(tunnel->o_seqno)); 781 } 782 783 return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu, 784 NEXTHDR_GRE); 785 } 786 787 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev) 788 { 789 struct ip6_tnl *t = netdev_priv(dev); 790 int encap_limit = -1; 791 struct flowi6 fl6; 792 __u8 dsfield = 0; 793 __u32 mtu; 794 int err; 795 796 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); 797 798 if (!t->parms.collect_md) 799 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6, 800 &dsfield, &encap_limit); 801 802 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)); 803 if (err) 804 return -1; 805 806 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, 807 skb->protocol); 808 if (err != 0) { 809 /* XXX: send ICMP error even if DF is not set. */ 810 if (err == -EMSGSIZE) 811 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, 812 htonl(mtu)); 813 return -1; 814 } 815 816 return 0; 817 } 818 819 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev) 820 { 821 struct ip6_tnl *t = netdev_priv(dev); 822 struct ipv6hdr *ipv6h = ipv6_hdr(skb); 823 int encap_limit = -1; 824 struct flowi6 fl6; 825 __u8 dsfield = 0; 826 __u32 mtu; 827 int err; 828 829 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr)) 830 return -1; 831 832 if (!t->parms.collect_md && 833 prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, &dsfield, &encap_limit)) 834 return -1; 835 836 if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM))) 837 return -1; 838 839 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, 840 &mtu, skb->protocol); 841 if (err != 0) { 842 if (err == -EMSGSIZE) 843 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 844 return -1; 845 } 846 847 return 0; 848 } 849 850 /** 851 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own 852 * @t: the outgoing tunnel device 853 * @hdr: IPv6 header from the incoming packet 854 * 855 * Description: 856 * Avoid trivial tunneling loop by checking that tunnel exit-point 857 * doesn't match source of incoming packet. 858 * 859 * Return: 860 * 1 if conflict, 861 * 0 else 862 **/ 863 864 static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t, 865 const struct ipv6hdr *hdr) 866 { 867 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); 868 } 869 870 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev) 871 { 872 struct ip6_tnl *t = netdev_priv(dev); 873 int encap_limit = -1; 874 struct flowi6 fl6; 875 __u32 mtu; 876 int err; 877 878 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 879 encap_limit = t->parms.encap_limit; 880 881 if (!t->parms.collect_md) 882 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); 883 884 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)); 885 if (err) 886 return err; 887 888 err = __gre6_xmit(skb, dev, 0, &fl6, encap_limit, &mtu, skb->protocol); 889 890 return err; 891 } 892 893 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb, 894 struct net_device *dev) 895 { 896 struct ip6_tnl *t = netdev_priv(dev); 897 struct net_device_stats *stats = &t->dev->stats; 898 int ret; 899 900 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr)) 901 goto tx_err; 902 903 switch (skb->protocol) { 904 case htons(ETH_P_IP): 905 ret = ip6gre_xmit_ipv4(skb, dev); 906 break; 907 case htons(ETH_P_IPV6): 908 ret = ip6gre_xmit_ipv6(skb, dev); 909 break; 910 default: 911 ret = ip6gre_xmit_other(skb, dev); 912 break; 913 } 914 915 if (ret < 0) 916 goto tx_err; 917 918 return NETDEV_TX_OK; 919 920 tx_err: 921 stats->tx_errors++; 922 stats->tx_dropped++; 923 kfree_skb(skb); 924 return NETDEV_TX_OK; 925 } 926 927 static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb, 928 struct net_device *dev) 929 { 930 struct ipv6hdr *ipv6h = ipv6_hdr(skb); 931 struct ip6_tnl *t = netdev_priv(dev); 932 struct dst_entry *dst = skb_dst(skb); 933 struct net_device_stats *stats; 934 bool truncate = false; 935 int encap_limit = -1; 936 __u8 dsfield = false; 937 struct flowi6 fl6; 938 int err = -EINVAL; 939 __u32 mtu; 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 pskb_trim(skb, dev->mtu + dev->hard_header_len); 949 truncate = true; 950 } 951 952 if (skb_cow_head(skb, dev->needed_headroom ?: t->hlen)) 953 goto tx_err; 954 955 t->parms.o_flags &= ~TUNNEL_KEY; 956 IPCB(skb)->flags = 0; 957 958 /* For collect_md mode, derive fl6 from the tunnel key, 959 * for native mode, call prepare_ip6gre_xmit_{ipv4,ipv6}. 960 */ 961 if (t->parms.collect_md) { 962 struct ip_tunnel_info *tun_info; 963 const struct ip_tunnel_key *key; 964 struct erspan_metadata *md; 965 __be32 tun_id; 966 967 tun_info = skb_tunnel_info(skb); 968 if (unlikely(!tun_info || 969 !(tun_info->mode & IP_TUNNEL_INFO_TX) || 970 ip_tunnel_info_af(tun_info) != AF_INET6)) 971 return -EINVAL; 972 973 key = &tun_info->key; 974 memset(&fl6, 0, sizeof(fl6)); 975 fl6.flowi6_proto = IPPROTO_GRE; 976 fl6.daddr = key->u.ipv6.dst; 977 fl6.flowlabel = key->label; 978 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL); 979 980 dsfield = key->tos; 981 md = ip_tunnel_info_opts(tun_info); 982 if (!md) 983 goto tx_err; 984 985 tun_id = tunnel_id_to_key32(key->tun_id); 986 if (md->version == 1) { 987 erspan_build_header(skb, 988 ntohl(tun_id), 989 ntohl(md->u.index), truncate, 990 false); 991 } else if (md->version == 2) { 992 erspan_build_header_v2(skb, 993 ntohl(tun_id), 994 md->u.md2.dir, 995 get_hwid(&md->u.md2), 996 truncate, false); 997 } else { 998 goto tx_err; 999 } 1000 } else { 1001 switch (skb->protocol) { 1002 case htons(ETH_P_IP): 1003 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); 1004 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6, 1005 &dsfield, &encap_limit); 1006 break; 1007 case htons(ETH_P_IPV6): 1008 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr)) 1009 goto tx_err; 1010 if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, 1011 &dsfield, &encap_limit)) 1012 goto tx_err; 1013 break; 1014 default: 1015 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); 1016 break; 1017 } 1018 1019 if (t->parms.erspan_ver == 1) 1020 erspan_build_header(skb, ntohl(t->parms.o_key), 1021 t->parms.index, 1022 truncate, false); 1023 else if (t->parms.erspan_ver == 2) 1024 erspan_build_header_v2(skb, ntohl(t->parms.o_key), 1025 t->parms.dir, 1026 t->parms.hwid, 1027 truncate, false); 1028 else 1029 goto tx_err; 1030 1031 fl6.daddr = t->parms.raddr; 1032 } 1033 1034 /* Push GRE header. */ 1035 gre_build_header(skb, 8, TUNNEL_SEQ, 1036 htons(ETH_P_ERSPAN), 0, htonl(t->o_seqno++)); 1037 1038 /* TooBig packet may have updated dst->dev's mtu */ 1039 if (!t->parms.collect_md && dst && dst_mtu(dst) > dst->dev->mtu) 1040 dst->ops->update_pmtu(dst, NULL, skb, dst->dev->mtu); 1041 1042 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, 1043 NEXTHDR_GRE); 1044 if (err != 0) { 1045 /* XXX: send ICMP error even if DF is not set. */ 1046 if (err == -EMSGSIZE) { 1047 if (skb->protocol == htons(ETH_P_IP)) 1048 icmp_send(skb, ICMP_DEST_UNREACH, 1049 ICMP_FRAG_NEEDED, htonl(mtu)); 1050 else 1051 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 1052 } 1053 1054 goto tx_err; 1055 } 1056 return NETDEV_TX_OK; 1057 1058 tx_err: 1059 stats = &t->dev->stats; 1060 stats->tx_errors++; 1061 stats->tx_dropped++; 1062 kfree_skb(skb); 1063 return NETDEV_TX_OK; 1064 } 1065 1066 static void ip6gre_tnl_link_config_common(struct ip6_tnl *t) 1067 { 1068 struct net_device *dev = t->dev; 1069 struct __ip6_tnl_parm *p = &t->parms; 1070 struct flowi6 *fl6 = &t->fl.u.ip6; 1071 1072 if (dev->type != ARPHRD_ETHER) { 1073 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); 1074 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); 1075 } 1076 1077 /* Set up flowi template */ 1078 fl6->saddr = p->laddr; 1079 fl6->daddr = p->raddr; 1080 fl6->flowi6_oif = p->link; 1081 fl6->flowlabel = 0; 1082 fl6->flowi6_proto = IPPROTO_GRE; 1083 1084 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) 1085 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; 1086 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) 1087 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; 1088 1089 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET); 1090 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr); 1091 1092 if (p->flags&IP6_TNL_F_CAP_XMIT && 1093 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER) 1094 dev->flags |= IFF_POINTOPOINT; 1095 else 1096 dev->flags &= ~IFF_POINTOPOINT; 1097 } 1098 1099 static void ip6gre_tnl_link_config_route(struct ip6_tnl *t, int set_mtu, 1100 int t_hlen) 1101 { 1102 const struct __ip6_tnl_parm *p = &t->parms; 1103 struct net_device *dev = t->dev; 1104 1105 if (p->flags & IP6_TNL_F_CAP_XMIT) { 1106 int strict = (ipv6_addr_type(&p->raddr) & 1107 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); 1108 1109 struct rt6_info *rt = rt6_lookup(t->net, 1110 &p->raddr, &p->laddr, 1111 p->link, NULL, strict); 1112 1113 if (!rt) 1114 return; 1115 1116 if (rt->dst.dev) { 1117 dev->hard_header_len = rt->dst.dev->hard_header_len + 1118 t_hlen; 1119 1120 if (set_mtu) { 1121 dev->mtu = rt->dst.dev->mtu - t_hlen; 1122 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1123 dev->mtu -= 8; 1124 if (dev->type == ARPHRD_ETHER) 1125 dev->mtu -= ETH_HLEN; 1126 1127 if (dev->mtu < IPV6_MIN_MTU) 1128 dev->mtu = IPV6_MIN_MTU; 1129 } 1130 } 1131 ip6_rt_put(rt); 1132 } 1133 } 1134 1135 static int ip6gre_calc_hlen(struct ip6_tnl *tunnel) 1136 { 1137 int t_hlen; 1138 1139 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags); 1140 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen; 1141 1142 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr); 1143 tunnel->dev->hard_header_len = LL_MAX_HEADER + t_hlen; 1144 return t_hlen; 1145 } 1146 1147 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu) 1148 { 1149 ip6gre_tnl_link_config_common(t); 1150 ip6gre_tnl_link_config_route(t, set_mtu, ip6gre_calc_hlen(t)); 1151 } 1152 1153 static void ip6gre_tnl_copy_tnl_parm(struct ip6_tnl *t, 1154 const struct __ip6_tnl_parm *p) 1155 { 1156 t->parms.laddr = p->laddr; 1157 t->parms.raddr = p->raddr; 1158 t->parms.flags = p->flags; 1159 t->parms.hop_limit = p->hop_limit; 1160 t->parms.encap_limit = p->encap_limit; 1161 t->parms.flowinfo = p->flowinfo; 1162 t->parms.link = p->link; 1163 t->parms.proto = p->proto; 1164 t->parms.i_key = p->i_key; 1165 t->parms.o_key = p->o_key; 1166 t->parms.i_flags = p->i_flags; 1167 t->parms.o_flags = p->o_flags; 1168 t->parms.fwmark = p->fwmark; 1169 dst_cache_reset(&t->dst_cache); 1170 } 1171 1172 static int ip6gre_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p, 1173 int set_mtu) 1174 { 1175 ip6gre_tnl_copy_tnl_parm(t, p); 1176 ip6gre_tnl_link_config(t, set_mtu); 1177 return 0; 1178 } 1179 1180 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p, 1181 const struct ip6_tnl_parm2 *u) 1182 { 1183 p->laddr = u->laddr; 1184 p->raddr = u->raddr; 1185 p->flags = u->flags; 1186 p->hop_limit = u->hop_limit; 1187 p->encap_limit = u->encap_limit; 1188 p->flowinfo = u->flowinfo; 1189 p->link = u->link; 1190 p->i_key = u->i_key; 1191 p->o_key = u->o_key; 1192 p->i_flags = gre_flags_to_tnl_flags(u->i_flags); 1193 p->o_flags = gre_flags_to_tnl_flags(u->o_flags); 1194 memcpy(p->name, u->name, sizeof(u->name)); 1195 } 1196 1197 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u, 1198 const struct __ip6_tnl_parm *p) 1199 { 1200 u->proto = IPPROTO_GRE; 1201 u->laddr = p->laddr; 1202 u->raddr = p->raddr; 1203 u->flags = p->flags; 1204 u->hop_limit = p->hop_limit; 1205 u->encap_limit = p->encap_limit; 1206 u->flowinfo = p->flowinfo; 1207 u->link = p->link; 1208 u->i_key = p->i_key; 1209 u->o_key = p->o_key; 1210 u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags); 1211 u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags); 1212 memcpy(u->name, p->name, sizeof(u->name)); 1213 } 1214 1215 static int ip6gre_tunnel_ioctl(struct net_device *dev, 1216 struct ifreq *ifr, int cmd) 1217 { 1218 int err = 0; 1219 struct ip6_tnl_parm2 p; 1220 struct __ip6_tnl_parm p1; 1221 struct ip6_tnl *t = netdev_priv(dev); 1222 struct net *net = t->net; 1223 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1224 1225 memset(&p1, 0, sizeof(p1)); 1226 1227 switch (cmd) { 1228 case SIOCGETTUNNEL: 1229 if (dev == ign->fb_tunnel_dev) { 1230 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { 1231 err = -EFAULT; 1232 break; 1233 } 1234 ip6gre_tnl_parm_from_user(&p1, &p); 1235 t = ip6gre_tunnel_locate(net, &p1, 0); 1236 if (!t) 1237 t = netdev_priv(dev); 1238 } 1239 memset(&p, 0, sizeof(p)); 1240 ip6gre_tnl_parm_to_user(&p, &t->parms); 1241 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) 1242 err = -EFAULT; 1243 break; 1244 1245 case SIOCADDTUNNEL: 1246 case SIOCCHGTUNNEL: 1247 err = -EPERM; 1248 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1249 goto done; 1250 1251 err = -EFAULT; 1252 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 1253 goto done; 1254 1255 err = -EINVAL; 1256 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING)) 1257 goto done; 1258 1259 if (!(p.i_flags&GRE_KEY)) 1260 p.i_key = 0; 1261 if (!(p.o_flags&GRE_KEY)) 1262 p.o_key = 0; 1263 1264 ip6gre_tnl_parm_from_user(&p1, &p); 1265 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL); 1266 1267 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { 1268 if (t) { 1269 if (t->dev != dev) { 1270 err = -EEXIST; 1271 break; 1272 } 1273 } else { 1274 t = netdev_priv(dev); 1275 1276 ip6gre_tunnel_unlink(ign, t); 1277 synchronize_net(); 1278 ip6gre_tnl_change(t, &p1, 1); 1279 ip6gre_tunnel_link(ign, t); 1280 netdev_state_change(dev); 1281 } 1282 } 1283 1284 if (t) { 1285 err = 0; 1286 1287 memset(&p, 0, sizeof(p)); 1288 ip6gre_tnl_parm_to_user(&p, &t->parms); 1289 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) 1290 err = -EFAULT; 1291 } else 1292 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); 1293 break; 1294 1295 case SIOCDELTUNNEL: 1296 err = -EPERM; 1297 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1298 goto done; 1299 1300 if (dev == ign->fb_tunnel_dev) { 1301 err = -EFAULT; 1302 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 1303 goto done; 1304 err = -ENOENT; 1305 ip6gre_tnl_parm_from_user(&p1, &p); 1306 t = ip6gre_tunnel_locate(net, &p1, 0); 1307 if (!t) 1308 goto done; 1309 err = -EPERM; 1310 if (t == netdev_priv(ign->fb_tunnel_dev)) 1311 goto done; 1312 dev = t->dev; 1313 } 1314 unregister_netdevice(dev); 1315 err = 0; 1316 break; 1317 1318 default: 1319 err = -EINVAL; 1320 } 1321 1322 done: 1323 return err; 1324 } 1325 1326 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev, 1327 unsigned short type, const void *daddr, 1328 const void *saddr, unsigned int len) 1329 { 1330 struct ip6_tnl *t = netdev_priv(dev); 1331 struct ipv6hdr *ipv6h; 1332 __be16 *p; 1333 1334 ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h)); 1335 ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb, 1336 t->fl.u.ip6.flowlabel, 1337 true, &t->fl.u.ip6)); 1338 ipv6h->hop_limit = t->parms.hop_limit; 1339 ipv6h->nexthdr = NEXTHDR_GRE; 1340 ipv6h->saddr = t->parms.laddr; 1341 ipv6h->daddr = t->parms.raddr; 1342 1343 p = (__be16 *)(ipv6h + 1); 1344 p[0] = t->parms.o_flags; 1345 p[1] = htons(type); 1346 1347 /* 1348 * Set the source hardware address. 1349 */ 1350 1351 if (saddr) 1352 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr)); 1353 if (daddr) 1354 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr)); 1355 if (!ipv6_addr_any(&ipv6h->daddr)) 1356 return t->hlen; 1357 1358 return -t->hlen; 1359 } 1360 1361 static const struct header_ops ip6gre_header_ops = { 1362 .create = ip6gre_header, 1363 }; 1364 1365 static const struct net_device_ops ip6gre_netdev_ops = { 1366 .ndo_init = ip6gre_tunnel_init, 1367 .ndo_uninit = ip6gre_tunnel_uninit, 1368 .ndo_start_xmit = ip6gre_tunnel_xmit, 1369 .ndo_do_ioctl = ip6gre_tunnel_ioctl, 1370 .ndo_change_mtu = ip6_tnl_change_mtu, 1371 .ndo_get_stats64 = ip_tunnel_get_stats64, 1372 .ndo_get_iflink = ip6_tnl_get_iflink, 1373 }; 1374 1375 static void ip6gre_dev_free(struct net_device *dev) 1376 { 1377 struct ip6_tnl *t = netdev_priv(dev); 1378 1379 dst_cache_destroy(&t->dst_cache); 1380 free_percpu(dev->tstats); 1381 } 1382 1383 static void ip6gre_tunnel_setup(struct net_device *dev) 1384 { 1385 dev->netdev_ops = &ip6gre_netdev_ops; 1386 dev->needs_free_netdev = true; 1387 dev->priv_destructor = ip6gre_dev_free; 1388 1389 dev->type = ARPHRD_IP6GRE; 1390 1391 dev->flags |= IFF_NOARP; 1392 dev->addr_len = sizeof(struct in6_addr); 1393 netif_keep_dst(dev); 1394 /* This perm addr will be used as interface identifier by IPv6 */ 1395 dev->addr_assign_type = NET_ADDR_RANDOM; 1396 eth_random_addr(dev->perm_addr); 1397 } 1398 1399 #define GRE6_FEATURES (NETIF_F_SG | \ 1400 NETIF_F_FRAGLIST | \ 1401 NETIF_F_HIGHDMA | \ 1402 NETIF_F_HW_CSUM) 1403 1404 static void ip6gre_tnl_init_features(struct net_device *dev) 1405 { 1406 struct ip6_tnl *nt = netdev_priv(dev); 1407 1408 dev->features |= GRE6_FEATURES; 1409 dev->hw_features |= GRE6_FEATURES; 1410 1411 if (!(nt->parms.o_flags & TUNNEL_SEQ)) { 1412 /* TCP offload with GRE SEQ is not supported, nor 1413 * can we support 2 levels of outer headers requiring 1414 * an update. 1415 */ 1416 if (!(nt->parms.o_flags & TUNNEL_CSUM) || 1417 nt->encap.type == TUNNEL_ENCAP_NONE) { 1418 dev->features |= NETIF_F_GSO_SOFTWARE; 1419 dev->hw_features |= NETIF_F_GSO_SOFTWARE; 1420 } 1421 1422 /* Can use a lockless transmit, unless we generate 1423 * output sequences 1424 */ 1425 dev->features |= NETIF_F_LLTX; 1426 } 1427 } 1428 1429 static int ip6gre_tunnel_init_common(struct net_device *dev) 1430 { 1431 struct ip6_tnl *tunnel; 1432 int ret; 1433 int t_hlen; 1434 1435 tunnel = netdev_priv(dev); 1436 1437 tunnel->dev = dev; 1438 tunnel->net = dev_net(dev); 1439 strcpy(tunnel->parms.name, dev->name); 1440 1441 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 1442 if (!dev->tstats) 1443 return -ENOMEM; 1444 1445 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); 1446 if (ret) { 1447 free_percpu(dev->tstats); 1448 dev->tstats = NULL; 1449 return ret; 1450 } 1451 1452 t_hlen = ip6gre_calc_hlen(tunnel); 1453 dev->mtu = ETH_DATA_LEN - t_hlen; 1454 if (dev->type == ARPHRD_ETHER) 1455 dev->mtu -= ETH_HLEN; 1456 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1457 dev->mtu -= 8; 1458 1459 if (tunnel->parms.collect_md) { 1460 dev->features |= NETIF_F_NETNS_LOCAL; 1461 netif_keep_dst(dev); 1462 } 1463 ip6gre_tnl_init_features(dev); 1464 1465 return 0; 1466 } 1467 1468 static int ip6gre_tunnel_init(struct net_device *dev) 1469 { 1470 struct ip6_tnl *tunnel; 1471 int ret; 1472 1473 ret = ip6gre_tunnel_init_common(dev); 1474 if (ret) 1475 return ret; 1476 1477 tunnel = netdev_priv(dev); 1478 1479 if (tunnel->parms.collect_md) 1480 return 0; 1481 1482 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr)); 1483 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr)); 1484 1485 if (ipv6_addr_any(&tunnel->parms.raddr)) 1486 dev->header_ops = &ip6gre_header_ops; 1487 1488 return 0; 1489 } 1490 1491 static void ip6gre_fb_tunnel_init(struct net_device *dev) 1492 { 1493 struct ip6_tnl *tunnel = netdev_priv(dev); 1494 1495 tunnel->dev = dev; 1496 tunnel->net = dev_net(dev); 1497 strcpy(tunnel->parms.name, dev->name); 1498 1499 tunnel->hlen = sizeof(struct ipv6hdr) + 4; 1500 1501 dev_hold(dev); 1502 } 1503 1504 static struct inet6_protocol ip6gre_protocol __read_mostly = { 1505 .handler = gre_rcv, 1506 .err_handler = ip6gre_err, 1507 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 1508 }; 1509 1510 static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head) 1511 { 1512 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1513 struct net_device *dev, *aux; 1514 int prio; 1515 1516 for_each_netdev_safe(net, dev, aux) 1517 if (dev->rtnl_link_ops == &ip6gre_link_ops || 1518 dev->rtnl_link_ops == &ip6gre_tap_ops || 1519 dev->rtnl_link_ops == &ip6erspan_tap_ops) 1520 unregister_netdevice_queue(dev, head); 1521 1522 for (prio = 0; prio < 4; prio++) { 1523 int h; 1524 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) { 1525 struct ip6_tnl *t; 1526 1527 t = rtnl_dereference(ign->tunnels[prio][h]); 1528 1529 while (t) { 1530 /* If dev is in the same netns, it has already 1531 * been added to the list by the previous loop. 1532 */ 1533 if (!net_eq(dev_net(t->dev), net)) 1534 unregister_netdevice_queue(t->dev, 1535 head); 1536 t = rtnl_dereference(t->next); 1537 } 1538 } 1539 } 1540 } 1541 1542 static int __net_init ip6gre_init_net(struct net *net) 1543 { 1544 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1545 int err; 1546 1547 if (!net_has_fallback_tunnels(net)) 1548 return 0; 1549 ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0", 1550 NET_NAME_UNKNOWN, 1551 ip6gre_tunnel_setup); 1552 if (!ign->fb_tunnel_dev) { 1553 err = -ENOMEM; 1554 goto err_alloc_dev; 1555 } 1556 dev_net_set(ign->fb_tunnel_dev, net); 1557 /* FB netdevice is special: we have one, and only one per netns. 1558 * Allowing to move it to another netns is clearly unsafe. 1559 */ 1560 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL; 1561 1562 1563 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev); 1564 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops; 1565 1566 err = register_netdev(ign->fb_tunnel_dev); 1567 if (err) 1568 goto err_reg_dev; 1569 1570 rcu_assign_pointer(ign->tunnels_wc[0], 1571 netdev_priv(ign->fb_tunnel_dev)); 1572 return 0; 1573 1574 err_reg_dev: 1575 free_netdev(ign->fb_tunnel_dev); 1576 err_alloc_dev: 1577 return err; 1578 } 1579 1580 static void __net_exit ip6gre_exit_batch_net(struct list_head *net_list) 1581 { 1582 struct net *net; 1583 LIST_HEAD(list); 1584 1585 rtnl_lock(); 1586 list_for_each_entry(net, net_list, exit_list) 1587 ip6gre_destroy_tunnels(net, &list); 1588 unregister_netdevice_many(&list); 1589 rtnl_unlock(); 1590 } 1591 1592 static struct pernet_operations ip6gre_net_ops = { 1593 .init = ip6gre_init_net, 1594 .exit_batch = ip6gre_exit_batch_net, 1595 .id = &ip6gre_net_id, 1596 .size = sizeof(struct ip6gre_net), 1597 }; 1598 1599 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[], 1600 struct netlink_ext_ack *extack) 1601 { 1602 __be16 flags; 1603 1604 if (!data) 1605 return 0; 1606 1607 flags = 0; 1608 if (data[IFLA_GRE_IFLAGS]) 1609 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); 1610 if (data[IFLA_GRE_OFLAGS]) 1611 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); 1612 if (flags & (GRE_VERSION|GRE_ROUTING)) 1613 return -EINVAL; 1614 1615 return 0; 1616 } 1617 1618 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[], 1619 struct netlink_ext_ack *extack) 1620 { 1621 struct in6_addr daddr; 1622 1623 if (tb[IFLA_ADDRESS]) { 1624 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 1625 return -EINVAL; 1626 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 1627 return -EADDRNOTAVAIL; 1628 } 1629 1630 if (!data) 1631 goto out; 1632 1633 if (data[IFLA_GRE_REMOTE]) { 1634 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]); 1635 if (ipv6_addr_any(&daddr)) 1636 return -EINVAL; 1637 } 1638 1639 out: 1640 return ip6gre_tunnel_validate(tb, data, extack); 1641 } 1642 1643 static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[], 1644 struct netlink_ext_ack *extack) 1645 { 1646 __be16 flags = 0; 1647 int ret, ver = 0; 1648 1649 if (!data) 1650 return 0; 1651 1652 ret = ip6gre_tap_validate(tb, data, extack); 1653 if (ret) 1654 return ret; 1655 1656 /* ERSPAN should only have GRE sequence and key flag */ 1657 if (data[IFLA_GRE_OFLAGS]) 1658 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); 1659 if (data[IFLA_GRE_IFLAGS]) 1660 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); 1661 if (!data[IFLA_GRE_COLLECT_METADATA] && 1662 flags != (GRE_SEQ | GRE_KEY)) 1663 return -EINVAL; 1664 1665 /* ERSPAN Session ID only has 10-bit. Since we reuse 1666 * 32-bit key field as ID, check it's range. 1667 */ 1668 if (data[IFLA_GRE_IKEY] && 1669 (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK)) 1670 return -EINVAL; 1671 1672 if (data[IFLA_GRE_OKEY] && 1673 (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK)) 1674 return -EINVAL; 1675 1676 if (data[IFLA_GRE_ERSPAN_VER]) { 1677 ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]); 1678 if (ver != 1 && ver != 2) 1679 return -EINVAL; 1680 } 1681 1682 if (ver == 1) { 1683 if (data[IFLA_GRE_ERSPAN_INDEX]) { 1684 u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]); 1685 1686 if (index & ~INDEX_MASK) 1687 return -EINVAL; 1688 } 1689 } else if (ver == 2) { 1690 if (data[IFLA_GRE_ERSPAN_DIR]) { 1691 u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]); 1692 1693 if (dir & ~(DIR_MASK >> DIR_OFFSET)) 1694 return -EINVAL; 1695 } 1696 1697 if (data[IFLA_GRE_ERSPAN_HWID]) { 1698 u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]); 1699 1700 if (hwid & ~(HWID_MASK >> HWID_OFFSET)) 1701 return -EINVAL; 1702 } 1703 } 1704 1705 return 0; 1706 } 1707 1708 static void ip6gre_netlink_parms(struct nlattr *data[], 1709 struct __ip6_tnl_parm *parms) 1710 { 1711 memset(parms, 0, sizeof(*parms)); 1712 1713 if (!data) 1714 return; 1715 1716 if (data[IFLA_GRE_LINK]) 1717 parms->link = nla_get_u32(data[IFLA_GRE_LINK]); 1718 1719 if (data[IFLA_GRE_IFLAGS]) 1720 parms->i_flags = gre_flags_to_tnl_flags( 1721 nla_get_be16(data[IFLA_GRE_IFLAGS])); 1722 1723 if (data[IFLA_GRE_OFLAGS]) 1724 parms->o_flags = gre_flags_to_tnl_flags( 1725 nla_get_be16(data[IFLA_GRE_OFLAGS])); 1726 1727 if (data[IFLA_GRE_IKEY]) 1728 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]); 1729 1730 if (data[IFLA_GRE_OKEY]) 1731 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]); 1732 1733 if (data[IFLA_GRE_LOCAL]) 1734 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]); 1735 1736 if (data[IFLA_GRE_REMOTE]) 1737 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]); 1738 1739 if (data[IFLA_GRE_TTL]) 1740 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]); 1741 1742 if (data[IFLA_GRE_ENCAP_LIMIT]) 1743 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]); 1744 1745 if (data[IFLA_GRE_FLOWINFO]) 1746 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]); 1747 1748 if (data[IFLA_GRE_FLAGS]) 1749 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]); 1750 1751 if (data[IFLA_GRE_FWMARK]) 1752 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]); 1753 1754 if (data[IFLA_GRE_COLLECT_METADATA]) 1755 parms->collect_md = true; 1756 1757 if (data[IFLA_GRE_ERSPAN_VER]) 1758 parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]); 1759 1760 if (parms->erspan_ver == 1) { 1761 if (data[IFLA_GRE_ERSPAN_INDEX]) 1762 parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]); 1763 } else if (parms->erspan_ver == 2) { 1764 if (data[IFLA_GRE_ERSPAN_DIR]) 1765 parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]); 1766 if (data[IFLA_GRE_ERSPAN_HWID]) 1767 parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]); 1768 } 1769 } 1770 1771 static int ip6gre_tap_init(struct net_device *dev) 1772 { 1773 int ret; 1774 1775 ret = ip6gre_tunnel_init_common(dev); 1776 if (ret) 1777 return ret; 1778 1779 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 1780 1781 return 0; 1782 } 1783 1784 static const struct net_device_ops ip6gre_tap_netdev_ops = { 1785 .ndo_init = ip6gre_tap_init, 1786 .ndo_uninit = ip6gre_tunnel_uninit, 1787 .ndo_start_xmit = ip6gre_tunnel_xmit, 1788 .ndo_set_mac_address = eth_mac_addr, 1789 .ndo_validate_addr = eth_validate_addr, 1790 .ndo_change_mtu = ip6_tnl_change_mtu, 1791 .ndo_get_stats64 = ip_tunnel_get_stats64, 1792 .ndo_get_iflink = ip6_tnl_get_iflink, 1793 }; 1794 1795 static int ip6erspan_calc_hlen(struct ip6_tnl *tunnel) 1796 { 1797 int t_hlen; 1798 1799 tunnel->tun_hlen = 8; 1800 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen + 1801 erspan_hdr_len(tunnel->parms.erspan_ver); 1802 1803 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr); 1804 tunnel->dev->hard_header_len = LL_MAX_HEADER + t_hlen; 1805 return t_hlen; 1806 } 1807 1808 static int ip6erspan_tap_init(struct net_device *dev) 1809 { 1810 struct ip6_tnl *tunnel; 1811 int t_hlen; 1812 int ret; 1813 1814 tunnel = netdev_priv(dev); 1815 1816 tunnel->dev = dev; 1817 tunnel->net = dev_net(dev); 1818 strcpy(tunnel->parms.name, dev->name); 1819 1820 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 1821 if (!dev->tstats) 1822 return -ENOMEM; 1823 1824 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); 1825 if (ret) { 1826 free_percpu(dev->tstats); 1827 dev->tstats = NULL; 1828 return ret; 1829 } 1830 1831 t_hlen = ip6erspan_calc_hlen(tunnel); 1832 dev->mtu = ETH_DATA_LEN - t_hlen; 1833 if (dev->type == ARPHRD_ETHER) 1834 dev->mtu -= ETH_HLEN; 1835 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1836 dev->mtu -= 8; 1837 1838 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 1839 ip6erspan_tnl_link_config(tunnel, 1); 1840 1841 return 0; 1842 } 1843 1844 static const struct net_device_ops ip6erspan_netdev_ops = { 1845 .ndo_init = ip6erspan_tap_init, 1846 .ndo_uninit = ip6erspan_tunnel_uninit, 1847 .ndo_start_xmit = ip6erspan_tunnel_xmit, 1848 .ndo_set_mac_address = eth_mac_addr, 1849 .ndo_validate_addr = eth_validate_addr, 1850 .ndo_change_mtu = ip6_tnl_change_mtu, 1851 .ndo_get_stats64 = ip_tunnel_get_stats64, 1852 .ndo_get_iflink = ip6_tnl_get_iflink, 1853 }; 1854 1855 static void ip6gre_tap_setup(struct net_device *dev) 1856 { 1857 1858 ether_setup(dev); 1859 1860 dev->max_mtu = 0; 1861 dev->netdev_ops = &ip6gre_tap_netdev_ops; 1862 dev->needs_free_netdev = true; 1863 dev->priv_destructor = ip6gre_dev_free; 1864 1865 dev->features |= NETIF_F_NETNS_LOCAL; 1866 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1867 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 1868 netif_keep_dst(dev); 1869 } 1870 1871 bool is_ip6gretap_dev(const struct net_device *dev) 1872 { 1873 return dev->netdev_ops == &ip6gre_tap_netdev_ops; 1874 } 1875 EXPORT_SYMBOL_GPL(is_ip6gretap_dev); 1876 1877 static bool ip6gre_netlink_encap_parms(struct nlattr *data[], 1878 struct ip_tunnel_encap *ipencap) 1879 { 1880 bool ret = false; 1881 1882 memset(ipencap, 0, sizeof(*ipencap)); 1883 1884 if (!data) 1885 return ret; 1886 1887 if (data[IFLA_GRE_ENCAP_TYPE]) { 1888 ret = true; 1889 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]); 1890 } 1891 1892 if (data[IFLA_GRE_ENCAP_FLAGS]) { 1893 ret = true; 1894 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]); 1895 } 1896 1897 if (data[IFLA_GRE_ENCAP_SPORT]) { 1898 ret = true; 1899 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]); 1900 } 1901 1902 if (data[IFLA_GRE_ENCAP_DPORT]) { 1903 ret = true; 1904 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]); 1905 } 1906 1907 return ret; 1908 } 1909 1910 static int ip6gre_newlink_common(struct net *src_net, struct net_device *dev, 1911 struct nlattr *tb[], struct nlattr *data[], 1912 struct netlink_ext_ack *extack) 1913 { 1914 struct ip6_tnl *nt; 1915 struct ip_tunnel_encap ipencap; 1916 int err; 1917 1918 nt = netdev_priv(dev); 1919 1920 if (ip6gre_netlink_encap_parms(data, &ipencap)) { 1921 int err = ip6_tnl_encap_setup(nt, &ipencap); 1922 1923 if (err < 0) 1924 return err; 1925 } 1926 1927 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS]) 1928 eth_hw_addr_random(dev); 1929 1930 nt->dev = dev; 1931 nt->net = dev_net(dev); 1932 1933 err = register_netdevice(dev); 1934 if (err) 1935 goto out; 1936 1937 if (tb[IFLA_MTU]) 1938 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 1939 1940 dev_hold(dev); 1941 1942 out: 1943 return err; 1944 } 1945 1946 static int ip6gre_newlink(struct net *src_net, struct net_device *dev, 1947 struct nlattr *tb[], struct nlattr *data[], 1948 struct netlink_ext_ack *extack) 1949 { 1950 struct ip6_tnl *nt = netdev_priv(dev); 1951 struct net *net = dev_net(dev); 1952 struct ip6gre_net *ign; 1953 int err; 1954 1955 ip6gre_netlink_parms(data, &nt->parms); 1956 ign = net_generic(net, ip6gre_net_id); 1957 1958 if (nt->parms.collect_md) { 1959 if (rtnl_dereference(ign->collect_md_tun)) 1960 return -EEXIST; 1961 } else { 1962 if (ip6gre_tunnel_find(net, &nt->parms, dev->type)) 1963 return -EEXIST; 1964 } 1965 1966 err = ip6gre_newlink_common(src_net, dev, tb, data, extack); 1967 if (!err) { 1968 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]); 1969 ip6gre_tunnel_link_md(ign, nt); 1970 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt); 1971 } 1972 return err; 1973 } 1974 1975 static struct ip6_tnl * 1976 ip6gre_changelink_common(struct net_device *dev, struct nlattr *tb[], 1977 struct nlattr *data[], struct __ip6_tnl_parm *p_p, 1978 struct netlink_ext_ack *extack) 1979 { 1980 struct ip6_tnl *t, *nt = netdev_priv(dev); 1981 struct net *net = nt->net; 1982 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1983 struct ip_tunnel_encap ipencap; 1984 1985 if (dev == ign->fb_tunnel_dev) 1986 return ERR_PTR(-EINVAL); 1987 1988 if (ip6gre_netlink_encap_parms(data, &ipencap)) { 1989 int err = ip6_tnl_encap_setup(nt, &ipencap); 1990 1991 if (err < 0) 1992 return ERR_PTR(err); 1993 } 1994 1995 ip6gre_netlink_parms(data, p_p); 1996 1997 t = ip6gre_tunnel_locate(net, p_p, 0); 1998 1999 if (t) { 2000 if (t->dev != dev) 2001 return ERR_PTR(-EEXIST); 2002 } else { 2003 t = nt; 2004 } 2005 2006 return t; 2007 } 2008 2009 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[], 2010 struct nlattr *data[], 2011 struct netlink_ext_ack *extack) 2012 { 2013 struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id); 2014 struct __ip6_tnl_parm p; 2015 struct ip6_tnl *t; 2016 2017 t = ip6gre_changelink_common(dev, tb, data, &p, extack); 2018 if (IS_ERR(t)) 2019 return PTR_ERR(t); 2020 2021 ip6gre_tunnel_unlink_md(ign, t); 2022 ip6gre_tunnel_unlink(ign, t); 2023 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]); 2024 ip6gre_tunnel_link_md(ign, t); 2025 ip6gre_tunnel_link(ign, t); 2026 return 0; 2027 } 2028 2029 static void ip6gre_dellink(struct net_device *dev, struct list_head *head) 2030 { 2031 struct net *net = dev_net(dev); 2032 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 2033 2034 if (dev != ign->fb_tunnel_dev) 2035 unregister_netdevice_queue(dev, head); 2036 } 2037 2038 static size_t ip6gre_get_size(const struct net_device *dev) 2039 { 2040 return 2041 /* IFLA_GRE_LINK */ 2042 nla_total_size(4) + 2043 /* IFLA_GRE_IFLAGS */ 2044 nla_total_size(2) + 2045 /* IFLA_GRE_OFLAGS */ 2046 nla_total_size(2) + 2047 /* IFLA_GRE_IKEY */ 2048 nla_total_size(4) + 2049 /* IFLA_GRE_OKEY */ 2050 nla_total_size(4) + 2051 /* IFLA_GRE_LOCAL */ 2052 nla_total_size(sizeof(struct in6_addr)) + 2053 /* IFLA_GRE_REMOTE */ 2054 nla_total_size(sizeof(struct in6_addr)) + 2055 /* IFLA_GRE_TTL */ 2056 nla_total_size(1) + 2057 /* IFLA_GRE_ENCAP_LIMIT */ 2058 nla_total_size(1) + 2059 /* IFLA_GRE_FLOWINFO */ 2060 nla_total_size(4) + 2061 /* IFLA_GRE_FLAGS */ 2062 nla_total_size(4) + 2063 /* IFLA_GRE_ENCAP_TYPE */ 2064 nla_total_size(2) + 2065 /* IFLA_GRE_ENCAP_FLAGS */ 2066 nla_total_size(2) + 2067 /* IFLA_GRE_ENCAP_SPORT */ 2068 nla_total_size(2) + 2069 /* IFLA_GRE_ENCAP_DPORT */ 2070 nla_total_size(2) + 2071 /* IFLA_GRE_COLLECT_METADATA */ 2072 nla_total_size(0) + 2073 /* IFLA_GRE_FWMARK */ 2074 nla_total_size(4) + 2075 /* IFLA_GRE_ERSPAN_INDEX */ 2076 nla_total_size(4) + 2077 0; 2078 } 2079 2080 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev) 2081 { 2082 struct ip6_tnl *t = netdev_priv(dev); 2083 struct __ip6_tnl_parm *p = &t->parms; 2084 2085 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) || 2086 nla_put_be16(skb, IFLA_GRE_IFLAGS, 2087 gre_tnl_flags_to_gre_flags(p->i_flags)) || 2088 nla_put_be16(skb, IFLA_GRE_OFLAGS, 2089 gre_tnl_flags_to_gre_flags(p->o_flags)) || 2090 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) || 2091 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) || 2092 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) || 2093 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) || 2094 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) || 2095 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) || 2096 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) || 2097 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) || 2098 nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark) || 2099 nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index)) 2100 goto nla_put_failure; 2101 2102 if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE, 2103 t->encap.type) || 2104 nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT, 2105 t->encap.sport) || 2106 nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT, 2107 t->encap.dport) || 2108 nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS, 2109 t->encap.flags)) 2110 goto nla_put_failure; 2111 2112 if (p->collect_md) { 2113 if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA)) 2114 goto nla_put_failure; 2115 } 2116 2117 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, p->erspan_ver)) 2118 goto nla_put_failure; 2119 2120 if (p->erspan_ver == 1) { 2121 if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index)) 2122 goto nla_put_failure; 2123 } else if (p->erspan_ver == 2) { 2124 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, p->dir)) 2125 goto nla_put_failure; 2126 if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, p->hwid)) 2127 goto nla_put_failure; 2128 } 2129 2130 return 0; 2131 2132 nla_put_failure: 2133 return -EMSGSIZE; 2134 } 2135 2136 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = { 2137 [IFLA_GRE_LINK] = { .type = NLA_U32 }, 2138 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 }, 2139 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 }, 2140 [IFLA_GRE_IKEY] = { .type = NLA_U32 }, 2141 [IFLA_GRE_OKEY] = { .type = NLA_U32 }, 2142 [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) }, 2143 [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) }, 2144 [IFLA_GRE_TTL] = { .type = NLA_U8 }, 2145 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 }, 2146 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 }, 2147 [IFLA_GRE_FLAGS] = { .type = NLA_U32 }, 2148 [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 }, 2149 [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 }, 2150 [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 }, 2151 [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 }, 2152 [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG }, 2153 [IFLA_GRE_FWMARK] = { .type = NLA_U32 }, 2154 [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 }, 2155 [IFLA_GRE_ERSPAN_VER] = { .type = NLA_U8 }, 2156 [IFLA_GRE_ERSPAN_DIR] = { .type = NLA_U8 }, 2157 [IFLA_GRE_ERSPAN_HWID] = { .type = NLA_U16 }, 2158 }; 2159 2160 static void ip6erspan_tap_setup(struct net_device *dev) 2161 { 2162 ether_setup(dev); 2163 2164 dev->netdev_ops = &ip6erspan_netdev_ops; 2165 dev->needs_free_netdev = true; 2166 dev->priv_destructor = ip6gre_dev_free; 2167 2168 dev->features |= NETIF_F_NETNS_LOCAL; 2169 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 2170 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 2171 netif_keep_dst(dev); 2172 } 2173 2174 static int ip6erspan_newlink(struct net *src_net, struct net_device *dev, 2175 struct nlattr *tb[], struct nlattr *data[], 2176 struct netlink_ext_ack *extack) 2177 { 2178 struct ip6_tnl *nt = netdev_priv(dev); 2179 struct net *net = dev_net(dev); 2180 struct ip6gre_net *ign; 2181 int err; 2182 2183 ip6gre_netlink_parms(data, &nt->parms); 2184 ign = net_generic(net, ip6gre_net_id); 2185 2186 if (nt->parms.collect_md) { 2187 if (rtnl_dereference(ign->collect_md_tun_erspan)) 2188 return -EEXIST; 2189 } else { 2190 if (ip6gre_tunnel_find(net, &nt->parms, dev->type)) 2191 return -EEXIST; 2192 } 2193 2194 err = ip6gre_newlink_common(src_net, dev, tb, data, extack); 2195 if (!err) { 2196 ip6erspan_tnl_link_config(nt, !tb[IFLA_MTU]); 2197 ip6erspan_tunnel_link_md(ign, nt); 2198 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt); 2199 } 2200 return err; 2201 } 2202 2203 static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu) 2204 { 2205 ip6gre_tnl_link_config_common(t); 2206 ip6gre_tnl_link_config_route(t, set_mtu, ip6erspan_calc_hlen(t)); 2207 } 2208 2209 static int ip6erspan_tnl_change(struct ip6_tnl *t, 2210 const struct __ip6_tnl_parm *p, int set_mtu) 2211 { 2212 ip6gre_tnl_copy_tnl_parm(t, p); 2213 ip6erspan_tnl_link_config(t, set_mtu); 2214 return 0; 2215 } 2216 2217 static int ip6erspan_changelink(struct net_device *dev, struct nlattr *tb[], 2218 struct nlattr *data[], 2219 struct netlink_ext_ack *extack) 2220 { 2221 struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id); 2222 struct __ip6_tnl_parm p; 2223 struct ip6_tnl *t; 2224 2225 t = ip6gre_changelink_common(dev, tb, data, &p, extack); 2226 if (IS_ERR(t)) 2227 return PTR_ERR(t); 2228 2229 ip6gre_tunnel_unlink_md(ign, t); 2230 ip6gre_tunnel_unlink(ign, t); 2231 ip6erspan_tnl_change(t, &p, !tb[IFLA_MTU]); 2232 ip6erspan_tunnel_link_md(ign, t); 2233 ip6gre_tunnel_link(ign, t); 2234 return 0; 2235 } 2236 2237 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = { 2238 .kind = "ip6gre", 2239 .maxtype = IFLA_GRE_MAX, 2240 .policy = ip6gre_policy, 2241 .priv_size = sizeof(struct ip6_tnl), 2242 .setup = ip6gre_tunnel_setup, 2243 .validate = ip6gre_tunnel_validate, 2244 .newlink = ip6gre_newlink, 2245 .changelink = ip6gre_changelink, 2246 .dellink = ip6gre_dellink, 2247 .get_size = ip6gre_get_size, 2248 .fill_info = ip6gre_fill_info, 2249 .get_link_net = ip6_tnl_get_link_net, 2250 }; 2251 2252 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = { 2253 .kind = "ip6gretap", 2254 .maxtype = IFLA_GRE_MAX, 2255 .policy = ip6gre_policy, 2256 .priv_size = sizeof(struct ip6_tnl), 2257 .setup = ip6gre_tap_setup, 2258 .validate = ip6gre_tap_validate, 2259 .newlink = ip6gre_newlink, 2260 .changelink = ip6gre_changelink, 2261 .get_size = ip6gre_get_size, 2262 .fill_info = ip6gre_fill_info, 2263 .get_link_net = ip6_tnl_get_link_net, 2264 }; 2265 2266 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly = { 2267 .kind = "ip6erspan", 2268 .maxtype = IFLA_GRE_MAX, 2269 .policy = ip6gre_policy, 2270 .priv_size = sizeof(struct ip6_tnl), 2271 .setup = ip6erspan_tap_setup, 2272 .validate = ip6erspan_tap_validate, 2273 .newlink = ip6erspan_newlink, 2274 .changelink = ip6erspan_changelink, 2275 .get_size = ip6gre_get_size, 2276 .fill_info = ip6gre_fill_info, 2277 .get_link_net = ip6_tnl_get_link_net, 2278 }; 2279 2280 /* 2281 * And now the modules code and kernel interface. 2282 */ 2283 2284 static int __init ip6gre_init(void) 2285 { 2286 int err; 2287 2288 pr_info("GRE over IPv6 tunneling driver\n"); 2289 2290 err = register_pernet_device(&ip6gre_net_ops); 2291 if (err < 0) 2292 return err; 2293 2294 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE); 2295 if (err < 0) { 2296 pr_info("%s: can't add protocol\n", __func__); 2297 goto add_proto_failed; 2298 } 2299 2300 err = rtnl_link_register(&ip6gre_link_ops); 2301 if (err < 0) 2302 goto rtnl_link_failed; 2303 2304 err = rtnl_link_register(&ip6gre_tap_ops); 2305 if (err < 0) 2306 goto tap_ops_failed; 2307 2308 err = rtnl_link_register(&ip6erspan_tap_ops); 2309 if (err < 0) 2310 goto erspan_link_failed; 2311 2312 out: 2313 return err; 2314 2315 erspan_link_failed: 2316 rtnl_link_unregister(&ip6gre_tap_ops); 2317 tap_ops_failed: 2318 rtnl_link_unregister(&ip6gre_link_ops); 2319 rtnl_link_failed: 2320 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE); 2321 add_proto_failed: 2322 unregister_pernet_device(&ip6gre_net_ops); 2323 goto out; 2324 } 2325 2326 static void __exit ip6gre_fini(void) 2327 { 2328 rtnl_link_unregister(&ip6gre_tap_ops); 2329 rtnl_link_unregister(&ip6gre_link_ops); 2330 rtnl_link_unregister(&ip6erspan_tap_ops); 2331 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE); 2332 unregister_pernet_device(&ip6gre_net_ops); 2333 } 2334 2335 module_init(ip6gre_init); 2336 module_exit(ip6gre_fini); 2337 MODULE_LICENSE("GPL"); 2338 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)"); 2339 MODULE_DESCRIPTION("GRE over IPv6 tunneling device"); 2340 MODULE_ALIAS_RTNL_LINK("ip6gre"); 2341 MODULE_ALIAS_RTNL_LINK("ip6gretap"); 2342 MODULE_ALIAS_RTNL_LINK("ip6erspan"); 2343 MODULE_ALIAS_NETDEV("ip6gre0"); 2344