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 int 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 ipv6hdr *ipv6h; 431 struct tnl_ptk_info tpi; 432 struct ip6_tnl *t; 433 434 if (gre_parse_header(skb, &tpi, NULL, htons(ETH_P_IPV6), 435 offset) < 0) 436 return -EINVAL; 437 438 ipv6h = (const struct ipv6hdr *)skb->data; 439 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr, 440 tpi.key, tpi.proto); 441 if (!t) 442 return -ENOENT; 443 444 switch (type) { 445 struct ipv6_tlv_tnl_enc_lim *tel; 446 __u32 teli; 447 case ICMPV6_DEST_UNREACH: 448 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n", 449 t->parms.name); 450 if (code != ICMPV6_PORT_UNREACH) 451 break; 452 return 0; 453 case ICMPV6_TIME_EXCEED: 454 if (code == ICMPV6_EXC_HOPLIMIT) { 455 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n", 456 t->parms.name); 457 break; 458 } 459 return 0; 460 case ICMPV6_PARAMPROB: 461 teli = 0; 462 if (code == ICMPV6_HDR_FIELD) 463 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data); 464 465 if (teli && teli == be32_to_cpu(info) - 2) { 466 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli]; 467 if (tel->encap_limit == 0) { 468 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n", 469 t->parms.name); 470 } 471 } else { 472 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n", 473 t->parms.name); 474 } 475 return 0; 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, int gre_hdr_len, 528 struct tnl_ptk_info *tpi) 529 { 530 struct erspan_base_hdr *ershdr; 531 struct erspan_metadata *pkt_md; 532 const struct ipv6hdr *ipv6h; 533 struct erspan_md2 *md2; 534 struct ip6_tnl *tunnel; 535 u8 ver; 536 537 if (unlikely(!pskb_may_pull(skb, sizeof(*ershdr)))) 538 return PACKET_REJECT; 539 540 ipv6h = ipv6_hdr(skb); 541 ershdr = (struct erspan_base_hdr *)skb->data; 542 ver = ershdr->ver; 543 tpi->key = cpu_to_be32(get_session_id(ershdr)); 544 545 tunnel = ip6gre_tunnel_lookup(skb->dev, 546 &ipv6h->saddr, &ipv6h->daddr, tpi->key, 547 tpi->proto); 548 if (tunnel) { 549 int len = erspan_hdr_len(ver); 550 551 if (unlikely(!pskb_may_pull(skb, len))) 552 return PACKET_REJECT; 553 554 ershdr = (struct erspan_base_hdr *)skb->data; 555 pkt_md = (struct erspan_metadata *)(ershdr + 1); 556 557 if (__iptunnel_pull_header(skb, len, 558 htons(ETH_P_TEB), 559 false, false) < 0) 560 return PACKET_REJECT; 561 562 if (tunnel->parms.collect_md) { 563 struct metadata_dst *tun_dst; 564 struct ip_tunnel_info *info; 565 struct erspan_metadata *md; 566 __be64 tun_id; 567 __be16 flags; 568 569 tpi->flags |= TUNNEL_KEY; 570 flags = tpi->flags; 571 tun_id = key32_to_tunnel_id(tpi->key); 572 573 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id, 574 sizeof(*md)); 575 if (!tun_dst) 576 return PACKET_REJECT; 577 578 info = &tun_dst->u.tun_info; 579 md = ip_tunnel_info_opts(info); 580 md->version = ver; 581 md2 = &md->u.md2; 582 memcpy(md2, pkt_md, ver == 1 ? ERSPAN_V1_MDSIZE : 583 ERSPAN_V2_MDSIZE); 584 info->key.tun_flags |= TUNNEL_ERSPAN_OPT; 585 info->options_len = sizeof(*md); 586 587 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error); 588 589 } else { 590 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error); 591 } 592 593 return PACKET_RCVD; 594 } 595 596 return PACKET_REJECT; 597 } 598 599 static int gre_rcv(struct sk_buff *skb) 600 { 601 struct tnl_ptk_info tpi; 602 bool csum_err = false; 603 int hdr_len; 604 605 hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0); 606 if (hdr_len < 0) 607 goto drop; 608 609 if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false)) 610 goto drop; 611 612 if (unlikely(tpi.proto == htons(ETH_P_ERSPAN) || 613 tpi.proto == htons(ETH_P_ERSPAN2))) { 614 if (ip6erspan_rcv(skb, hdr_len, &tpi) == PACKET_RCVD) 615 return 0; 616 goto out; 617 } 618 619 if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD) 620 return 0; 621 622 out: 623 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); 624 drop: 625 kfree_skb(skb); 626 return 0; 627 } 628 629 static int gre_handle_offloads(struct sk_buff *skb, bool csum) 630 { 631 return iptunnel_handle_offloads(skb, 632 csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE); 633 } 634 635 static void prepare_ip6gre_xmit_ipv4(struct sk_buff *skb, 636 struct net_device *dev, 637 struct flowi6 *fl6, __u8 *dsfield, 638 int *encap_limit) 639 { 640 const struct iphdr *iph = ip_hdr(skb); 641 struct ip6_tnl *t = netdev_priv(dev); 642 643 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 644 *encap_limit = t->parms.encap_limit; 645 646 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6)); 647 648 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) 649 *dsfield = ipv4_get_dsfield(iph); 650 else 651 *dsfield = ip6_tclass(t->parms.flowinfo); 652 653 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) 654 fl6->flowi6_mark = skb->mark; 655 else 656 fl6->flowi6_mark = t->parms.fwmark; 657 658 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL); 659 } 660 661 static int prepare_ip6gre_xmit_ipv6(struct sk_buff *skb, 662 struct net_device *dev, 663 struct flowi6 *fl6, __u8 *dsfield, 664 int *encap_limit) 665 { 666 struct ipv6hdr *ipv6h = ipv6_hdr(skb); 667 struct ip6_tnl *t = netdev_priv(dev); 668 __u16 offset; 669 670 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb)); 671 /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */ 672 673 if (offset > 0) { 674 struct ipv6_tlv_tnl_enc_lim *tel; 675 676 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset]; 677 if (tel->encap_limit == 0) { 678 icmpv6_send(skb, ICMPV6_PARAMPROB, 679 ICMPV6_HDR_FIELD, offset + 2); 680 return -1; 681 } 682 *encap_limit = tel->encap_limit - 1; 683 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) { 684 *encap_limit = t->parms.encap_limit; 685 } 686 687 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6)); 688 689 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) 690 *dsfield = ipv6_get_dsfield(ipv6h); 691 else 692 *dsfield = ip6_tclass(t->parms.flowinfo); 693 694 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL) 695 fl6->flowlabel |= ip6_flowlabel(ipv6h); 696 697 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) 698 fl6->flowi6_mark = skb->mark; 699 else 700 fl6->flowi6_mark = t->parms.fwmark; 701 702 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL); 703 704 return 0; 705 } 706 707 static netdev_tx_t __gre6_xmit(struct sk_buff *skb, 708 struct net_device *dev, __u8 dsfield, 709 struct flowi6 *fl6, int encap_limit, 710 __u32 *pmtu, __be16 proto) 711 { 712 struct ip6_tnl *tunnel = netdev_priv(dev); 713 __be16 protocol; 714 715 if (dev->type == ARPHRD_ETHER) 716 IPCB(skb)->flags = 0; 717 718 if (dev->header_ops && dev->type == ARPHRD_IP6GRE) 719 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr; 720 else 721 fl6->daddr = tunnel->parms.raddr; 722 723 if (skb_cow_head(skb, dev->needed_headroom ?: tunnel->hlen)) 724 return -ENOMEM; 725 726 /* Push GRE header. */ 727 protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto; 728 729 if (tunnel->parms.collect_md) { 730 struct ip_tunnel_info *tun_info; 731 const struct ip_tunnel_key *key; 732 __be16 flags; 733 734 tun_info = skb_tunnel_info(skb); 735 if (unlikely(!tun_info || 736 !(tun_info->mode & IP_TUNNEL_INFO_TX) || 737 ip_tunnel_info_af(tun_info) != AF_INET6)) 738 return -EINVAL; 739 740 key = &tun_info->key; 741 memset(fl6, 0, sizeof(*fl6)); 742 fl6->flowi6_proto = IPPROTO_GRE; 743 fl6->daddr = key->u.ipv6.dst; 744 fl6->flowlabel = key->label; 745 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL); 746 747 dsfield = key->tos; 748 flags = key->tun_flags & 749 (TUNNEL_CSUM | TUNNEL_KEY | TUNNEL_SEQ); 750 tunnel->tun_hlen = gre_calc_hlen(flags); 751 752 gre_build_header(skb, tunnel->tun_hlen, 753 flags, protocol, 754 tunnel_id_to_key32(tun_info->key.tun_id), 755 (flags & TUNNEL_SEQ) ? htonl(tunnel->o_seqno++) 756 : 0); 757 758 } else { 759 if (tunnel->parms.o_flags & TUNNEL_SEQ) 760 tunnel->o_seqno++; 761 762 gre_build_header(skb, tunnel->tun_hlen, tunnel->parms.o_flags, 763 protocol, tunnel->parms.o_key, 764 htonl(tunnel->o_seqno)); 765 } 766 767 return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu, 768 NEXTHDR_GRE); 769 } 770 771 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev) 772 { 773 struct ip6_tnl *t = netdev_priv(dev); 774 int encap_limit = -1; 775 struct flowi6 fl6; 776 __u8 dsfield = 0; 777 __u32 mtu; 778 int err; 779 780 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); 781 782 if (!t->parms.collect_md) 783 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6, 784 &dsfield, &encap_limit); 785 786 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)); 787 if (err) 788 return -1; 789 790 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, 791 skb->protocol); 792 if (err != 0) { 793 /* XXX: send ICMP error even if DF is not set. */ 794 if (err == -EMSGSIZE) 795 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, 796 htonl(mtu)); 797 return -1; 798 } 799 800 return 0; 801 } 802 803 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev) 804 { 805 struct ip6_tnl *t = netdev_priv(dev); 806 struct ipv6hdr *ipv6h = ipv6_hdr(skb); 807 int encap_limit = -1; 808 struct flowi6 fl6; 809 __u8 dsfield = 0; 810 __u32 mtu; 811 int err; 812 813 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr)) 814 return -1; 815 816 if (!t->parms.collect_md && 817 prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, &dsfield, &encap_limit)) 818 return -1; 819 820 if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM))) 821 return -1; 822 823 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, 824 &mtu, skb->protocol); 825 if (err != 0) { 826 if (err == -EMSGSIZE) 827 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 828 return -1; 829 } 830 831 return 0; 832 } 833 834 /** 835 * ip6gre_tnl_addr_conflict - compare packet addresses to tunnel's own 836 * @t: the outgoing tunnel device 837 * @hdr: IPv6 header from the incoming packet 838 * 839 * Description: 840 * Avoid trivial tunneling loop by checking that tunnel exit-point 841 * doesn't match source of incoming packet. 842 * 843 * Return: 844 * 1 if conflict, 845 * 0 else 846 **/ 847 848 static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t, 849 const struct ipv6hdr *hdr) 850 { 851 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); 852 } 853 854 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev) 855 { 856 struct ip6_tnl *t = netdev_priv(dev); 857 int encap_limit = -1; 858 struct flowi6 fl6; 859 __u32 mtu; 860 int err; 861 862 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 863 encap_limit = t->parms.encap_limit; 864 865 if (!t->parms.collect_md) 866 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); 867 868 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)); 869 if (err) 870 return err; 871 872 err = __gre6_xmit(skb, dev, 0, &fl6, encap_limit, &mtu, skb->protocol); 873 874 return err; 875 } 876 877 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb, 878 struct net_device *dev) 879 { 880 struct ip6_tnl *t = netdev_priv(dev); 881 struct net_device_stats *stats = &t->dev->stats; 882 int ret; 883 884 if (!pskb_inet_may_pull(skb)) 885 goto tx_err; 886 887 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr)) 888 goto tx_err; 889 890 switch (skb->protocol) { 891 case htons(ETH_P_IP): 892 ret = ip6gre_xmit_ipv4(skb, dev); 893 break; 894 case htons(ETH_P_IPV6): 895 ret = ip6gre_xmit_ipv6(skb, dev); 896 break; 897 default: 898 ret = ip6gre_xmit_other(skb, dev); 899 break; 900 } 901 902 if (ret < 0) 903 goto tx_err; 904 905 return NETDEV_TX_OK; 906 907 tx_err: 908 stats->tx_errors++; 909 stats->tx_dropped++; 910 kfree_skb(skb); 911 return NETDEV_TX_OK; 912 } 913 914 static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb, 915 struct net_device *dev) 916 { 917 struct ip6_tnl *t = netdev_priv(dev); 918 struct dst_entry *dst = skb_dst(skb); 919 struct net_device_stats *stats; 920 bool truncate = false; 921 int encap_limit = -1; 922 __u8 dsfield = false; 923 struct flowi6 fl6; 924 int err = -EINVAL; 925 __be16 proto; 926 __u32 mtu; 927 int nhoff; 928 int thoff; 929 930 if (!pskb_inet_may_pull(skb)) 931 goto tx_err; 932 933 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr)) 934 goto tx_err; 935 936 if (gre_handle_offloads(skb, false)) 937 goto tx_err; 938 939 if (skb->len > dev->mtu + dev->hard_header_len) { 940 pskb_trim(skb, dev->mtu + dev->hard_header_len); 941 truncate = true; 942 } 943 944 nhoff = skb_network_header(skb) - skb_mac_header(skb); 945 if (skb->protocol == htons(ETH_P_IP) && 946 (ntohs(ip_hdr(skb)->tot_len) > skb->len - nhoff)) 947 truncate = true; 948 949 thoff = skb_transport_header(skb) - skb_mac_header(skb); 950 if (skb->protocol == htons(ETH_P_IPV6) && 951 (ntohs(ipv6_hdr(skb)->payload_len) > skb->len - thoff)) 952 truncate = true; 953 954 if (skb_cow_head(skb, dev->needed_headroom ?: t->hlen)) 955 goto tx_err; 956 957 t->parms.o_flags &= ~TUNNEL_KEY; 958 IPCB(skb)->flags = 0; 959 960 /* For collect_md mode, derive fl6 from the tunnel key, 961 * for native mode, call prepare_ip6gre_xmit_{ipv4,ipv6}. 962 */ 963 if (t->parms.collect_md) { 964 struct ip_tunnel_info *tun_info; 965 const struct ip_tunnel_key *key; 966 struct erspan_metadata *md; 967 __be32 tun_id; 968 969 tun_info = skb_tunnel_info(skb); 970 if (unlikely(!tun_info || 971 !(tun_info->mode & IP_TUNNEL_INFO_TX) || 972 ip_tunnel_info_af(tun_info) != AF_INET6)) 973 return -EINVAL; 974 975 key = &tun_info->key; 976 memset(&fl6, 0, sizeof(fl6)); 977 fl6.flowi6_proto = IPPROTO_GRE; 978 fl6.daddr = key->u.ipv6.dst; 979 fl6.flowlabel = key->label; 980 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL); 981 982 dsfield = key->tos; 983 if (!(tun_info->key.tun_flags & TUNNEL_ERSPAN_OPT)) 984 goto tx_err; 985 md = ip_tunnel_info_opts(tun_info); 986 if (!md) 987 goto tx_err; 988 989 tun_id = tunnel_id_to_key32(key->tun_id); 990 if (md->version == 1) { 991 erspan_build_header(skb, 992 ntohl(tun_id), 993 ntohl(md->u.index), truncate, 994 false); 995 } else if (md->version == 2) { 996 erspan_build_header_v2(skb, 997 ntohl(tun_id), 998 md->u.md2.dir, 999 get_hwid(&md->u.md2), 1000 truncate, false); 1001 } else { 1002 goto tx_err; 1003 } 1004 } else { 1005 switch (skb->protocol) { 1006 case htons(ETH_P_IP): 1007 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); 1008 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6, 1009 &dsfield, &encap_limit); 1010 break; 1011 case htons(ETH_P_IPV6): 1012 if (ipv6_addr_equal(&t->parms.raddr, &ipv6_hdr(skb)->saddr)) 1013 goto tx_err; 1014 if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, 1015 &dsfield, &encap_limit)) 1016 goto tx_err; 1017 break; 1018 default: 1019 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); 1020 break; 1021 } 1022 1023 if (t->parms.erspan_ver == 1) 1024 erspan_build_header(skb, ntohl(t->parms.o_key), 1025 t->parms.index, 1026 truncate, false); 1027 else if (t->parms.erspan_ver == 2) 1028 erspan_build_header_v2(skb, ntohl(t->parms.o_key), 1029 t->parms.dir, 1030 t->parms.hwid, 1031 truncate, false); 1032 else 1033 goto tx_err; 1034 1035 fl6.daddr = t->parms.raddr; 1036 } 1037 1038 /* Push GRE header. */ 1039 proto = (t->parms.erspan_ver == 1) ? htons(ETH_P_ERSPAN) 1040 : htons(ETH_P_ERSPAN2); 1041 gre_build_header(skb, 8, TUNNEL_SEQ, proto, 0, htonl(t->o_seqno++)); 1042 1043 /* TooBig packet may have updated dst->dev's mtu */ 1044 if (!t->parms.collect_md && dst && dst_mtu(dst) > dst->dev->mtu) 1045 dst->ops->update_pmtu(dst, NULL, skb, dst->dev->mtu); 1046 1047 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, 1048 NEXTHDR_GRE); 1049 if (err != 0) { 1050 /* XXX: send ICMP error even if DF is not set. */ 1051 if (err == -EMSGSIZE) { 1052 if (skb->protocol == htons(ETH_P_IP)) 1053 icmp_send(skb, ICMP_DEST_UNREACH, 1054 ICMP_FRAG_NEEDED, htonl(mtu)); 1055 else 1056 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 1057 } 1058 1059 goto tx_err; 1060 } 1061 return NETDEV_TX_OK; 1062 1063 tx_err: 1064 stats = &t->dev->stats; 1065 stats->tx_errors++; 1066 stats->tx_dropped++; 1067 kfree_skb(skb); 1068 return NETDEV_TX_OK; 1069 } 1070 1071 static void ip6gre_tnl_link_config_common(struct ip6_tnl *t) 1072 { 1073 struct net_device *dev = t->dev; 1074 struct __ip6_tnl_parm *p = &t->parms; 1075 struct flowi6 *fl6 = &t->fl.u.ip6; 1076 1077 if (dev->type != ARPHRD_ETHER) { 1078 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); 1079 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); 1080 } 1081 1082 /* Set up flowi template */ 1083 fl6->saddr = p->laddr; 1084 fl6->daddr = p->raddr; 1085 fl6->flowi6_oif = p->link; 1086 fl6->flowlabel = 0; 1087 fl6->flowi6_proto = IPPROTO_GRE; 1088 1089 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) 1090 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; 1091 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) 1092 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; 1093 1094 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET); 1095 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr); 1096 1097 if (p->flags&IP6_TNL_F_CAP_XMIT && 1098 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER) 1099 dev->flags |= IFF_POINTOPOINT; 1100 else 1101 dev->flags &= ~IFF_POINTOPOINT; 1102 } 1103 1104 static void ip6gre_tnl_link_config_route(struct ip6_tnl *t, int set_mtu, 1105 int t_hlen) 1106 { 1107 const struct __ip6_tnl_parm *p = &t->parms; 1108 struct net_device *dev = t->dev; 1109 1110 if (p->flags & IP6_TNL_F_CAP_XMIT) { 1111 int strict = (ipv6_addr_type(&p->raddr) & 1112 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); 1113 1114 struct rt6_info *rt = rt6_lookup(t->net, 1115 &p->raddr, &p->laddr, 1116 p->link, NULL, strict); 1117 1118 if (!rt) 1119 return; 1120 1121 if (rt->dst.dev) { 1122 dev->needed_headroom = rt->dst.dev->hard_header_len + 1123 t_hlen; 1124 1125 if (set_mtu) { 1126 dev->mtu = rt->dst.dev->mtu - t_hlen; 1127 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1128 dev->mtu -= 8; 1129 if (dev->type == ARPHRD_ETHER) 1130 dev->mtu -= ETH_HLEN; 1131 1132 if (dev->mtu < IPV6_MIN_MTU) 1133 dev->mtu = IPV6_MIN_MTU; 1134 } 1135 } 1136 ip6_rt_put(rt); 1137 } 1138 } 1139 1140 static int ip6gre_calc_hlen(struct ip6_tnl *tunnel) 1141 { 1142 int t_hlen; 1143 1144 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags); 1145 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen; 1146 1147 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr); 1148 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen; 1149 return t_hlen; 1150 } 1151 1152 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu) 1153 { 1154 ip6gre_tnl_link_config_common(t); 1155 ip6gre_tnl_link_config_route(t, set_mtu, ip6gre_calc_hlen(t)); 1156 } 1157 1158 static void ip6gre_tnl_copy_tnl_parm(struct ip6_tnl *t, 1159 const struct __ip6_tnl_parm *p) 1160 { 1161 t->parms.laddr = p->laddr; 1162 t->parms.raddr = p->raddr; 1163 t->parms.flags = p->flags; 1164 t->parms.hop_limit = p->hop_limit; 1165 t->parms.encap_limit = p->encap_limit; 1166 t->parms.flowinfo = p->flowinfo; 1167 t->parms.link = p->link; 1168 t->parms.proto = p->proto; 1169 t->parms.i_key = p->i_key; 1170 t->parms.o_key = p->o_key; 1171 t->parms.i_flags = p->i_flags; 1172 t->parms.o_flags = p->o_flags; 1173 t->parms.fwmark = p->fwmark; 1174 t->parms.erspan_ver = p->erspan_ver; 1175 t->parms.index = p->index; 1176 t->parms.dir = p->dir; 1177 t->parms.hwid = p->hwid; 1178 dst_cache_reset(&t->dst_cache); 1179 } 1180 1181 static int ip6gre_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p, 1182 int set_mtu) 1183 { 1184 ip6gre_tnl_copy_tnl_parm(t, p); 1185 ip6gre_tnl_link_config(t, set_mtu); 1186 return 0; 1187 } 1188 1189 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p, 1190 const struct ip6_tnl_parm2 *u) 1191 { 1192 p->laddr = u->laddr; 1193 p->raddr = u->raddr; 1194 p->flags = u->flags; 1195 p->hop_limit = u->hop_limit; 1196 p->encap_limit = u->encap_limit; 1197 p->flowinfo = u->flowinfo; 1198 p->link = u->link; 1199 p->i_key = u->i_key; 1200 p->o_key = u->o_key; 1201 p->i_flags = gre_flags_to_tnl_flags(u->i_flags); 1202 p->o_flags = gre_flags_to_tnl_flags(u->o_flags); 1203 memcpy(p->name, u->name, sizeof(u->name)); 1204 } 1205 1206 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u, 1207 const struct __ip6_tnl_parm *p) 1208 { 1209 u->proto = IPPROTO_GRE; 1210 u->laddr = p->laddr; 1211 u->raddr = p->raddr; 1212 u->flags = p->flags; 1213 u->hop_limit = p->hop_limit; 1214 u->encap_limit = p->encap_limit; 1215 u->flowinfo = p->flowinfo; 1216 u->link = p->link; 1217 u->i_key = p->i_key; 1218 u->o_key = p->o_key; 1219 u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags); 1220 u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags); 1221 memcpy(u->name, p->name, sizeof(u->name)); 1222 } 1223 1224 static int ip6gre_tunnel_ioctl(struct net_device *dev, 1225 struct ifreq *ifr, int cmd) 1226 { 1227 int err = 0; 1228 struct ip6_tnl_parm2 p; 1229 struct __ip6_tnl_parm p1; 1230 struct ip6_tnl *t = netdev_priv(dev); 1231 struct net *net = t->net; 1232 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1233 1234 memset(&p1, 0, sizeof(p1)); 1235 1236 switch (cmd) { 1237 case SIOCGETTUNNEL: 1238 if (dev == ign->fb_tunnel_dev) { 1239 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { 1240 err = -EFAULT; 1241 break; 1242 } 1243 ip6gre_tnl_parm_from_user(&p1, &p); 1244 t = ip6gre_tunnel_locate(net, &p1, 0); 1245 if (!t) 1246 t = netdev_priv(dev); 1247 } 1248 memset(&p, 0, sizeof(p)); 1249 ip6gre_tnl_parm_to_user(&p, &t->parms); 1250 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) 1251 err = -EFAULT; 1252 break; 1253 1254 case SIOCADDTUNNEL: 1255 case SIOCCHGTUNNEL: 1256 err = -EPERM; 1257 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1258 goto done; 1259 1260 err = -EFAULT; 1261 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 1262 goto done; 1263 1264 err = -EINVAL; 1265 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING)) 1266 goto done; 1267 1268 if (!(p.i_flags&GRE_KEY)) 1269 p.i_key = 0; 1270 if (!(p.o_flags&GRE_KEY)) 1271 p.o_key = 0; 1272 1273 ip6gre_tnl_parm_from_user(&p1, &p); 1274 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL); 1275 1276 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { 1277 if (t) { 1278 if (t->dev != dev) { 1279 err = -EEXIST; 1280 break; 1281 } 1282 } else { 1283 t = netdev_priv(dev); 1284 1285 ip6gre_tunnel_unlink(ign, t); 1286 synchronize_net(); 1287 ip6gre_tnl_change(t, &p1, 1); 1288 ip6gre_tunnel_link(ign, t); 1289 netdev_state_change(dev); 1290 } 1291 } 1292 1293 if (t) { 1294 err = 0; 1295 1296 memset(&p, 0, sizeof(p)); 1297 ip6gre_tnl_parm_to_user(&p, &t->parms); 1298 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) 1299 err = -EFAULT; 1300 } else 1301 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); 1302 break; 1303 1304 case SIOCDELTUNNEL: 1305 err = -EPERM; 1306 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1307 goto done; 1308 1309 if (dev == ign->fb_tunnel_dev) { 1310 err = -EFAULT; 1311 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 1312 goto done; 1313 err = -ENOENT; 1314 ip6gre_tnl_parm_from_user(&p1, &p); 1315 t = ip6gre_tunnel_locate(net, &p1, 0); 1316 if (!t) 1317 goto done; 1318 err = -EPERM; 1319 if (t == netdev_priv(ign->fb_tunnel_dev)) 1320 goto done; 1321 dev = t->dev; 1322 } 1323 unregister_netdevice(dev); 1324 err = 0; 1325 break; 1326 1327 default: 1328 err = -EINVAL; 1329 } 1330 1331 done: 1332 return err; 1333 } 1334 1335 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev, 1336 unsigned short type, const void *daddr, 1337 const void *saddr, unsigned int len) 1338 { 1339 struct ip6_tnl *t = netdev_priv(dev); 1340 struct ipv6hdr *ipv6h; 1341 __be16 *p; 1342 1343 ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h)); 1344 ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb, 1345 t->fl.u.ip6.flowlabel, 1346 true, &t->fl.u.ip6)); 1347 ipv6h->hop_limit = t->parms.hop_limit; 1348 ipv6h->nexthdr = NEXTHDR_GRE; 1349 ipv6h->saddr = t->parms.laddr; 1350 ipv6h->daddr = t->parms.raddr; 1351 1352 p = (__be16 *)(ipv6h + 1); 1353 p[0] = t->parms.o_flags; 1354 p[1] = htons(type); 1355 1356 /* 1357 * Set the source hardware address. 1358 */ 1359 1360 if (saddr) 1361 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr)); 1362 if (daddr) 1363 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr)); 1364 if (!ipv6_addr_any(&ipv6h->daddr)) 1365 return t->hlen; 1366 1367 return -t->hlen; 1368 } 1369 1370 static const struct header_ops ip6gre_header_ops = { 1371 .create = ip6gre_header, 1372 }; 1373 1374 static const struct net_device_ops ip6gre_netdev_ops = { 1375 .ndo_init = ip6gre_tunnel_init, 1376 .ndo_uninit = ip6gre_tunnel_uninit, 1377 .ndo_start_xmit = ip6gre_tunnel_xmit, 1378 .ndo_do_ioctl = ip6gre_tunnel_ioctl, 1379 .ndo_change_mtu = ip6_tnl_change_mtu, 1380 .ndo_get_stats64 = ip_tunnel_get_stats64, 1381 .ndo_get_iflink = ip6_tnl_get_iflink, 1382 }; 1383 1384 static void ip6gre_dev_free(struct net_device *dev) 1385 { 1386 struct ip6_tnl *t = netdev_priv(dev); 1387 1388 gro_cells_destroy(&t->gro_cells); 1389 dst_cache_destroy(&t->dst_cache); 1390 free_percpu(dev->tstats); 1391 } 1392 1393 static void ip6gre_tunnel_setup(struct net_device *dev) 1394 { 1395 dev->netdev_ops = &ip6gre_netdev_ops; 1396 dev->needs_free_netdev = true; 1397 dev->priv_destructor = ip6gre_dev_free; 1398 1399 dev->type = ARPHRD_IP6GRE; 1400 1401 dev->flags |= IFF_NOARP; 1402 dev->addr_len = sizeof(struct in6_addr); 1403 netif_keep_dst(dev); 1404 /* This perm addr will be used as interface identifier by IPv6 */ 1405 dev->addr_assign_type = NET_ADDR_RANDOM; 1406 eth_random_addr(dev->perm_addr); 1407 } 1408 1409 #define GRE6_FEATURES (NETIF_F_SG | \ 1410 NETIF_F_FRAGLIST | \ 1411 NETIF_F_HIGHDMA | \ 1412 NETIF_F_HW_CSUM) 1413 1414 static void ip6gre_tnl_init_features(struct net_device *dev) 1415 { 1416 struct ip6_tnl *nt = netdev_priv(dev); 1417 1418 dev->features |= GRE6_FEATURES; 1419 dev->hw_features |= GRE6_FEATURES; 1420 1421 if (!(nt->parms.o_flags & TUNNEL_SEQ)) { 1422 /* TCP offload with GRE SEQ is not supported, nor 1423 * can we support 2 levels of outer headers requiring 1424 * an update. 1425 */ 1426 if (!(nt->parms.o_flags & TUNNEL_CSUM) || 1427 nt->encap.type == TUNNEL_ENCAP_NONE) { 1428 dev->features |= NETIF_F_GSO_SOFTWARE; 1429 dev->hw_features |= NETIF_F_GSO_SOFTWARE; 1430 } 1431 1432 /* Can use a lockless transmit, unless we generate 1433 * output sequences 1434 */ 1435 dev->features |= NETIF_F_LLTX; 1436 } 1437 } 1438 1439 static int ip6gre_tunnel_init_common(struct net_device *dev) 1440 { 1441 struct ip6_tnl *tunnel; 1442 int ret; 1443 int t_hlen; 1444 1445 tunnel = netdev_priv(dev); 1446 1447 tunnel->dev = dev; 1448 tunnel->net = dev_net(dev); 1449 strcpy(tunnel->parms.name, dev->name); 1450 1451 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 1452 if (!dev->tstats) 1453 return -ENOMEM; 1454 1455 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); 1456 if (ret) 1457 goto cleanup_alloc_pcpu_stats; 1458 1459 ret = gro_cells_init(&tunnel->gro_cells, dev); 1460 if (ret) 1461 goto cleanup_dst_cache_init; 1462 1463 t_hlen = ip6gre_calc_hlen(tunnel); 1464 dev->mtu = ETH_DATA_LEN - t_hlen; 1465 if (dev->type == ARPHRD_ETHER) 1466 dev->mtu -= ETH_HLEN; 1467 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1468 dev->mtu -= 8; 1469 1470 if (tunnel->parms.collect_md) { 1471 dev->features |= NETIF_F_NETNS_LOCAL; 1472 netif_keep_dst(dev); 1473 } 1474 ip6gre_tnl_init_features(dev); 1475 1476 return 0; 1477 1478 cleanup_dst_cache_init: 1479 dst_cache_destroy(&tunnel->dst_cache); 1480 cleanup_alloc_pcpu_stats: 1481 free_percpu(dev->tstats); 1482 dev->tstats = NULL; 1483 return ret; 1484 } 1485 1486 static int ip6gre_tunnel_init(struct net_device *dev) 1487 { 1488 struct ip6_tnl *tunnel; 1489 int ret; 1490 1491 ret = ip6gre_tunnel_init_common(dev); 1492 if (ret) 1493 return ret; 1494 1495 tunnel = netdev_priv(dev); 1496 1497 if (tunnel->parms.collect_md) 1498 return 0; 1499 1500 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr)); 1501 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr)); 1502 1503 if (ipv6_addr_any(&tunnel->parms.raddr)) 1504 dev->header_ops = &ip6gre_header_ops; 1505 1506 return 0; 1507 } 1508 1509 static void ip6gre_fb_tunnel_init(struct net_device *dev) 1510 { 1511 struct ip6_tnl *tunnel = netdev_priv(dev); 1512 1513 tunnel->dev = dev; 1514 tunnel->net = dev_net(dev); 1515 strcpy(tunnel->parms.name, dev->name); 1516 1517 tunnel->hlen = sizeof(struct ipv6hdr) + 4; 1518 1519 dev_hold(dev); 1520 } 1521 1522 static struct inet6_protocol ip6gre_protocol __read_mostly = { 1523 .handler = gre_rcv, 1524 .err_handler = ip6gre_err, 1525 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 1526 }; 1527 1528 static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head) 1529 { 1530 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1531 struct net_device *dev, *aux; 1532 int prio; 1533 1534 for_each_netdev_safe(net, dev, aux) 1535 if (dev->rtnl_link_ops == &ip6gre_link_ops || 1536 dev->rtnl_link_ops == &ip6gre_tap_ops || 1537 dev->rtnl_link_ops == &ip6erspan_tap_ops) 1538 unregister_netdevice_queue(dev, head); 1539 1540 for (prio = 0; prio < 4; prio++) { 1541 int h; 1542 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) { 1543 struct ip6_tnl *t; 1544 1545 t = rtnl_dereference(ign->tunnels[prio][h]); 1546 1547 while (t) { 1548 /* If dev is in the same netns, it has already 1549 * been added to the list by the previous loop. 1550 */ 1551 if (!net_eq(dev_net(t->dev), net)) 1552 unregister_netdevice_queue(t->dev, 1553 head); 1554 t = rtnl_dereference(t->next); 1555 } 1556 } 1557 } 1558 } 1559 1560 static int __net_init ip6gre_init_net(struct net *net) 1561 { 1562 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1563 int err; 1564 1565 if (!net_has_fallback_tunnels(net)) 1566 return 0; 1567 ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0", 1568 NET_NAME_UNKNOWN, 1569 ip6gre_tunnel_setup); 1570 if (!ign->fb_tunnel_dev) { 1571 err = -ENOMEM; 1572 goto err_alloc_dev; 1573 } 1574 dev_net_set(ign->fb_tunnel_dev, net); 1575 /* FB netdevice is special: we have one, and only one per netns. 1576 * Allowing to move it to another netns is clearly unsafe. 1577 */ 1578 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL; 1579 1580 1581 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev); 1582 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops; 1583 1584 err = register_netdev(ign->fb_tunnel_dev); 1585 if (err) 1586 goto err_reg_dev; 1587 1588 rcu_assign_pointer(ign->tunnels_wc[0], 1589 netdev_priv(ign->fb_tunnel_dev)); 1590 return 0; 1591 1592 err_reg_dev: 1593 free_netdev(ign->fb_tunnel_dev); 1594 err_alloc_dev: 1595 return err; 1596 } 1597 1598 static void __net_exit ip6gre_exit_batch_net(struct list_head *net_list) 1599 { 1600 struct net *net; 1601 LIST_HEAD(list); 1602 1603 rtnl_lock(); 1604 list_for_each_entry(net, net_list, exit_list) 1605 ip6gre_destroy_tunnels(net, &list); 1606 unregister_netdevice_many(&list); 1607 rtnl_unlock(); 1608 } 1609 1610 static struct pernet_operations ip6gre_net_ops = { 1611 .init = ip6gre_init_net, 1612 .exit_batch = ip6gre_exit_batch_net, 1613 .id = &ip6gre_net_id, 1614 .size = sizeof(struct ip6gre_net), 1615 }; 1616 1617 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[], 1618 struct netlink_ext_ack *extack) 1619 { 1620 __be16 flags; 1621 1622 if (!data) 1623 return 0; 1624 1625 flags = 0; 1626 if (data[IFLA_GRE_IFLAGS]) 1627 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); 1628 if (data[IFLA_GRE_OFLAGS]) 1629 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); 1630 if (flags & (GRE_VERSION|GRE_ROUTING)) 1631 return -EINVAL; 1632 1633 return 0; 1634 } 1635 1636 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[], 1637 struct netlink_ext_ack *extack) 1638 { 1639 struct in6_addr daddr; 1640 1641 if (tb[IFLA_ADDRESS]) { 1642 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 1643 return -EINVAL; 1644 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 1645 return -EADDRNOTAVAIL; 1646 } 1647 1648 if (!data) 1649 goto out; 1650 1651 if (data[IFLA_GRE_REMOTE]) { 1652 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]); 1653 if (ipv6_addr_any(&daddr)) 1654 return -EINVAL; 1655 } 1656 1657 out: 1658 return ip6gre_tunnel_validate(tb, data, extack); 1659 } 1660 1661 static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[], 1662 struct netlink_ext_ack *extack) 1663 { 1664 __be16 flags = 0; 1665 int ret, ver = 0; 1666 1667 if (!data) 1668 return 0; 1669 1670 ret = ip6gre_tap_validate(tb, data, extack); 1671 if (ret) 1672 return ret; 1673 1674 /* ERSPAN should only have GRE sequence and key flag */ 1675 if (data[IFLA_GRE_OFLAGS]) 1676 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); 1677 if (data[IFLA_GRE_IFLAGS]) 1678 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); 1679 if (!data[IFLA_GRE_COLLECT_METADATA] && 1680 flags != (GRE_SEQ | GRE_KEY)) 1681 return -EINVAL; 1682 1683 /* ERSPAN Session ID only has 10-bit. Since we reuse 1684 * 32-bit key field as ID, check it's range. 1685 */ 1686 if (data[IFLA_GRE_IKEY] && 1687 (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK)) 1688 return -EINVAL; 1689 1690 if (data[IFLA_GRE_OKEY] && 1691 (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK)) 1692 return -EINVAL; 1693 1694 if (data[IFLA_GRE_ERSPAN_VER]) { 1695 ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]); 1696 if (ver != 1 && ver != 2) 1697 return -EINVAL; 1698 } 1699 1700 if (ver == 1) { 1701 if (data[IFLA_GRE_ERSPAN_INDEX]) { 1702 u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]); 1703 1704 if (index & ~INDEX_MASK) 1705 return -EINVAL; 1706 } 1707 } else if (ver == 2) { 1708 if (data[IFLA_GRE_ERSPAN_DIR]) { 1709 u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]); 1710 1711 if (dir & ~(DIR_MASK >> DIR_OFFSET)) 1712 return -EINVAL; 1713 } 1714 1715 if (data[IFLA_GRE_ERSPAN_HWID]) { 1716 u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]); 1717 1718 if (hwid & ~(HWID_MASK >> HWID_OFFSET)) 1719 return -EINVAL; 1720 } 1721 } 1722 1723 return 0; 1724 } 1725 1726 static void ip6gre_netlink_parms(struct nlattr *data[], 1727 struct __ip6_tnl_parm *parms) 1728 { 1729 memset(parms, 0, sizeof(*parms)); 1730 1731 if (!data) 1732 return; 1733 1734 if (data[IFLA_GRE_LINK]) 1735 parms->link = nla_get_u32(data[IFLA_GRE_LINK]); 1736 1737 if (data[IFLA_GRE_IFLAGS]) 1738 parms->i_flags = gre_flags_to_tnl_flags( 1739 nla_get_be16(data[IFLA_GRE_IFLAGS])); 1740 1741 if (data[IFLA_GRE_OFLAGS]) 1742 parms->o_flags = gre_flags_to_tnl_flags( 1743 nla_get_be16(data[IFLA_GRE_OFLAGS])); 1744 1745 if (data[IFLA_GRE_IKEY]) 1746 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]); 1747 1748 if (data[IFLA_GRE_OKEY]) 1749 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]); 1750 1751 if (data[IFLA_GRE_LOCAL]) 1752 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]); 1753 1754 if (data[IFLA_GRE_REMOTE]) 1755 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]); 1756 1757 if (data[IFLA_GRE_TTL]) 1758 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]); 1759 1760 if (data[IFLA_GRE_ENCAP_LIMIT]) 1761 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]); 1762 1763 if (data[IFLA_GRE_FLOWINFO]) 1764 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]); 1765 1766 if (data[IFLA_GRE_FLAGS]) 1767 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]); 1768 1769 if (data[IFLA_GRE_FWMARK]) 1770 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]); 1771 1772 if (data[IFLA_GRE_COLLECT_METADATA]) 1773 parms->collect_md = true; 1774 1775 parms->erspan_ver = 1; 1776 if (data[IFLA_GRE_ERSPAN_VER]) 1777 parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]); 1778 1779 if (parms->erspan_ver == 1) { 1780 if (data[IFLA_GRE_ERSPAN_INDEX]) 1781 parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]); 1782 } else if (parms->erspan_ver == 2) { 1783 if (data[IFLA_GRE_ERSPAN_DIR]) 1784 parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]); 1785 if (data[IFLA_GRE_ERSPAN_HWID]) 1786 parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]); 1787 } 1788 } 1789 1790 static int ip6gre_tap_init(struct net_device *dev) 1791 { 1792 int ret; 1793 1794 ret = ip6gre_tunnel_init_common(dev); 1795 if (ret) 1796 return ret; 1797 1798 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 1799 1800 return 0; 1801 } 1802 1803 static const struct net_device_ops ip6gre_tap_netdev_ops = { 1804 .ndo_init = ip6gre_tap_init, 1805 .ndo_uninit = ip6gre_tunnel_uninit, 1806 .ndo_start_xmit = ip6gre_tunnel_xmit, 1807 .ndo_set_mac_address = eth_mac_addr, 1808 .ndo_validate_addr = eth_validate_addr, 1809 .ndo_change_mtu = ip6_tnl_change_mtu, 1810 .ndo_get_stats64 = ip_tunnel_get_stats64, 1811 .ndo_get_iflink = ip6_tnl_get_iflink, 1812 }; 1813 1814 static int ip6erspan_calc_hlen(struct ip6_tnl *tunnel) 1815 { 1816 int t_hlen; 1817 1818 tunnel->tun_hlen = 8; 1819 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen + 1820 erspan_hdr_len(tunnel->parms.erspan_ver); 1821 1822 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr); 1823 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen; 1824 return t_hlen; 1825 } 1826 1827 static int ip6erspan_tap_init(struct net_device *dev) 1828 { 1829 struct ip6_tnl *tunnel; 1830 int t_hlen; 1831 int ret; 1832 1833 tunnel = netdev_priv(dev); 1834 1835 tunnel->dev = dev; 1836 tunnel->net = dev_net(dev); 1837 strcpy(tunnel->parms.name, dev->name); 1838 1839 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 1840 if (!dev->tstats) 1841 return -ENOMEM; 1842 1843 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); 1844 if (ret) 1845 goto cleanup_alloc_pcpu_stats; 1846 1847 ret = gro_cells_init(&tunnel->gro_cells, dev); 1848 if (ret) 1849 goto cleanup_dst_cache_init; 1850 1851 t_hlen = ip6erspan_calc_hlen(tunnel); 1852 dev->mtu = ETH_DATA_LEN - t_hlen; 1853 if (dev->type == ARPHRD_ETHER) 1854 dev->mtu -= ETH_HLEN; 1855 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1856 dev->mtu -= 8; 1857 1858 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 1859 ip6erspan_tnl_link_config(tunnel, 1); 1860 1861 return 0; 1862 1863 cleanup_dst_cache_init: 1864 dst_cache_destroy(&tunnel->dst_cache); 1865 cleanup_alloc_pcpu_stats: 1866 free_percpu(dev->tstats); 1867 dev->tstats = NULL; 1868 return ret; 1869 } 1870 1871 static const struct net_device_ops ip6erspan_netdev_ops = { 1872 .ndo_init = ip6erspan_tap_init, 1873 .ndo_uninit = ip6erspan_tunnel_uninit, 1874 .ndo_start_xmit = ip6erspan_tunnel_xmit, 1875 .ndo_set_mac_address = eth_mac_addr, 1876 .ndo_validate_addr = eth_validate_addr, 1877 .ndo_change_mtu = ip6_tnl_change_mtu, 1878 .ndo_get_stats64 = ip_tunnel_get_stats64, 1879 .ndo_get_iflink = ip6_tnl_get_iflink, 1880 }; 1881 1882 static void ip6gre_tap_setup(struct net_device *dev) 1883 { 1884 1885 ether_setup(dev); 1886 1887 dev->max_mtu = 0; 1888 dev->netdev_ops = &ip6gre_tap_netdev_ops; 1889 dev->needs_free_netdev = true; 1890 dev->priv_destructor = ip6gre_dev_free; 1891 1892 dev->features |= NETIF_F_NETNS_LOCAL; 1893 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1894 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 1895 netif_keep_dst(dev); 1896 } 1897 1898 static bool ip6gre_netlink_encap_parms(struct nlattr *data[], 1899 struct ip_tunnel_encap *ipencap) 1900 { 1901 bool ret = false; 1902 1903 memset(ipencap, 0, sizeof(*ipencap)); 1904 1905 if (!data) 1906 return ret; 1907 1908 if (data[IFLA_GRE_ENCAP_TYPE]) { 1909 ret = true; 1910 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]); 1911 } 1912 1913 if (data[IFLA_GRE_ENCAP_FLAGS]) { 1914 ret = true; 1915 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]); 1916 } 1917 1918 if (data[IFLA_GRE_ENCAP_SPORT]) { 1919 ret = true; 1920 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]); 1921 } 1922 1923 if (data[IFLA_GRE_ENCAP_DPORT]) { 1924 ret = true; 1925 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]); 1926 } 1927 1928 return ret; 1929 } 1930 1931 static int ip6gre_newlink_common(struct net *src_net, struct net_device *dev, 1932 struct nlattr *tb[], struct nlattr *data[], 1933 struct netlink_ext_ack *extack) 1934 { 1935 struct ip6_tnl *nt; 1936 struct ip_tunnel_encap ipencap; 1937 int err; 1938 1939 nt = netdev_priv(dev); 1940 1941 if (ip6gre_netlink_encap_parms(data, &ipencap)) { 1942 int err = ip6_tnl_encap_setup(nt, &ipencap); 1943 1944 if (err < 0) 1945 return err; 1946 } 1947 1948 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS]) 1949 eth_hw_addr_random(dev); 1950 1951 nt->dev = dev; 1952 nt->net = dev_net(dev); 1953 1954 err = register_netdevice(dev); 1955 if (err) 1956 goto out; 1957 1958 if (tb[IFLA_MTU]) 1959 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 1960 1961 dev_hold(dev); 1962 1963 out: 1964 return err; 1965 } 1966 1967 static int ip6gre_newlink(struct net *src_net, struct net_device *dev, 1968 struct nlattr *tb[], struct nlattr *data[], 1969 struct netlink_ext_ack *extack) 1970 { 1971 struct ip6_tnl *nt = netdev_priv(dev); 1972 struct net *net = dev_net(dev); 1973 struct ip6gre_net *ign; 1974 int err; 1975 1976 ip6gre_netlink_parms(data, &nt->parms); 1977 ign = net_generic(net, ip6gre_net_id); 1978 1979 if (nt->parms.collect_md) { 1980 if (rtnl_dereference(ign->collect_md_tun)) 1981 return -EEXIST; 1982 } else { 1983 if (ip6gre_tunnel_find(net, &nt->parms, dev->type)) 1984 return -EEXIST; 1985 } 1986 1987 err = ip6gre_newlink_common(src_net, dev, tb, data, extack); 1988 if (!err) { 1989 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]); 1990 ip6gre_tunnel_link_md(ign, nt); 1991 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt); 1992 } 1993 return err; 1994 } 1995 1996 static struct ip6_tnl * 1997 ip6gre_changelink_common(struct net_device *dev, struct nlattr *tb[], 1998 struct nlattr *data[], struct __ip6_tnl_parm *p_p, 1999 struct netlink_ext_ack *extack) 2000 { 2001 struct ip6_tnl *t, *nt = netdev_priv(dev); 2002 struct net *net = nt->net; 2003 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 2004 struct ip_tunnel_encap ipencap; 2005 2006 if (dev == ign->fb_tunnel_dev) 2007 return ERR_PTR(-EINVAL); 2008 2009 if (ip6gre_netlink_encap_parms(data, &ipencap)) { 2010 int err = ip6_tnl_encap_setup(nt, &ipencap); 2011 2012 if (err < 0) 2013 return ERR_PTR(err); 2014 } 2015 2016 ip6gre_netlink_parms(data, p_p); 2017 2018 t = ip6gre_tunnel_locate(net, p_p, 0); 2019 2020 if (t) { 2021 if (t->dev != dev) 2022 return ERR_PTR(-EEXIST); 2023 } else { 2024 t = nt; 2025 } 2026 2027 return t; 2028 } 2029 2030 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[], 2031 struct nlattr *data[], 2032 struct netlink_ext_ack *extack) 2033 { 2034 struct ip6_tnl *t = netdev_priv(dev); 2035 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id); 2036 struct __ip6_tnl_parm p; 2037 2038 t = ip6gre_changelink_common(dev, tb, data, &p, extack); 2039 if (IS_ERR(t)) 2040 return PTR_ERR(t); 2041 2042 ip6gre_tunnel_unlink_md(ign, t); 2043 ip6gre_tunnel_unlink(ign, t); 2044 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]); 2045 ip6gre_tunnel_link_md(ign, t); 2046 ip6gre_tunnel_link(ign, t); 2047 return 0; 2048 } 2049 2050 static void ip6gre_dellink(struct net_device *dev, struct list_head *head) 2051 { 2052 struct net *net = dev_net(dev); 2053 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 2054 2055 if (dev != ign->fb_tunnel_dev) 2056 unregister_netdevice_queue(dev, head); 2057 } 2058 2059 static size_t ip6gre_get_size(const struct net_device *dev) 2060 { 2061 return 2062 /* IFLA_GRE_LINK */ 2063 nla_total_size(4) + 2064 /* IFLA_GRE_IFLAGS */ 2065 nla_total_size(2) + 2066 /* IFLA_GRE_OFLAGS */ 2067 nla_total_size(2) + 2068 /* IFLA_GRE_IKEY */ 2069 nla_total_size(4) + 2070 /* IFLA_GRE_OKEY */ 2071 nla_total_size(4) + 2072 /* IFLA_GRE_LOCAL */ 2073 nla_total_size(sizeof(struct in6_addr)) + 2074 /* IFLA_GRE_REMOTE */ 2075 nla_total_size(sizeof(struct in6_addr)) + 2076 /* IFLA_GRE_TTL */ 2077 nla_total_size(1) + 2078 /* IFLA_GRE_ENCAP_LIMIT */ 2079 nla_total_size(1) + 2080 /* IFLA_GRE_FLOWINFO */ 2081 nla_total_size(4) + 2082 /* IFLA_GRE_FLAGS */ 2083 nla_total_size(4) + 2084 /* IFLA_GRE_ENCAP_TYPE */ 2085 nla_total_size(2) + 2086 /* IFLA_GRE_ENCAP_FLAGS */ 2087 nla_total_size(2) + 2088 /* IFLA_GRE_ENCAP_SPORT */ 2089 nla_total_size(2) + 2090 /* IFLA_GRE_ENCAP_DPORT */ 2091 nla_total_size(2) + 2092 /* IFLA_GRE_COLLECT_METADATA */ 2093 nla_total_size(0) + 2094 /* IFLA_GRE_FWMARK */ 2095 nla_total_size(4) + 2096 /* IFLA_GRE_ERSPAN_INDEX */ 2097 nla_total_size(4) + 2098 0; 2099 } 2100 2101 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev) 2102 { 2103 struct ip6_tnl *t = netdev_priv(dev); 2104 struct __ip6_tnl_parm *p = &t->parms; 2105 2106 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) || 2107 nla_put_be16(skb, IFLA_GRE_IFLAGS, 2108 gre_tnl_flags_to_gre_flags(p->i_flags)) || 2109 nla_put_be16(skb, IFLA_GRE_OFLAGS, 2110 gre_tnl_flags_to_gre_flags(p->o_flags)) || 2111 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) || 2112 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) || 2113 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) || 2114 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) || 2115 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) || 2116 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) || 2117 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) || 2118 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) || 2119 nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark) || 2120 nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index)) 2121 goto nla_put_failure; 2122 2123 if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE, 2124 t->encap.type) || 2125 nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT, 2126 t->encap.sport) || 2127 nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT, 2128 t->encap.dport) || 2129 nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS, 2130 t->encap.flags)) 2131 goto nla_put_failure; 2132 2133 if (p->collect_md) { 2134 if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA)) 2135 goto nla_put_failure; 2136 } 2137 2138 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, p->erspan_ver)) 2139 goto nla_put_failure; 2140 2141 if (p->erspan_ver == 1) { 2142 if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index)) 2143 goto nla_put_failure; 2144 } else if (p->erspan_ver == 2) { 2145 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, p->dir)) 2146 goto nla_put_failure; 2147 if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, p->hwid)) 2148 goto nla_put_failure; 2149 } 2150 2151 return 0; 2152 2153 nla_put_failure: 2154 return -EMSGSIZE; 2155 } 2156 2157 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = { 2158 [IFLA_GRE_LINK] = { .type = NLA_U32 }, 2159 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 }, 2160 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 }, 2161 [IFLA_GRE_IKEY] = { .type = NLA_U32 }, 2162 [IFLA_GRE_OKEY] = { .type = NLA_U32 }, 2163 [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) }, 2164 [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) }, 2165 [IFLA_GRE_TTL] = { .type = NLA_U8 }, 2166 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 }, 2167 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 }, 2168 [IFLA_GRE_FLAGS] = { .type = NLA_U32 }, 2169 [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 }, 2170 [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 }, 2171 [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 }, 2172 [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 }, 2173 [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG }, 2174 [IFLA_GRE_FWMARK] = { .type = NLA_U32 }, 2175 [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 }, 2176 [IFLA_GRE_ERSPAN_VER] = { .type = NLA_U8 }, 2177 [IFLA_GRE_ERSPAN_DIR] = { .type = NLA_U8 }, 2178 [IFLA_GRE_ERSPAN_HWID] = { .type = NLA_U16 }, 2179 }; 2180 2181 static void ip6erspan_tap_setup(struct net_device *dev) 2182 { 2183 ether_setup(dev); 2184 2185 dev->netdev_ops = &ip6erspan_netdev_ops; 2186 dev->needs_free_netdev = true; 2187 dev->priv_destructor = ip6gre_dev_free; 2188 2189 dev->features |= NETIF_F_NETNS_LOCAL; 2190 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 2191 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 2192 netif_keep_dst(dev); 2193 } 2194 2195 static int ip6erspan_newlink(struct net *src_net, struct net_device *dev, 2196 struct nlattr *tb[], struct nlattr *data[], 2197 struct netlink_ext_ack *extack) 2198 { 2199 struct ip6_tnl *nt = netdev_priv(dev); 2200 struct net *net = dev_net(dev); 2201 struct ip6gre_net *ign; 2202 int err; 2203 2204 ip6gre_netlink_parms(data, &nt->parms); 2205 ign = net_generic(net, ip6gre_net_id); 2206 2207 if (nt->parms.collect_md) { 2208 if (rtnl_dereference(ign->collect_md_tun_erspan)) 2209 return -EEXIST; 2210 } else { 2211 if (ip6gre_tunnel_find(net, &nt->parms, dev->type)) 2212 return -EEXIST; 2213 } 2214 2215 err = ip6gre_newlink_common(src_net, dev, tb, data, extack); 2216 if (!err) { 2217 ip6erspan_tnl_link_config(nt, !tb[IFLA_MTU]); 2218 ip6erspan_tunnel_link_md(ign, nt); 2219 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt); 2220 } 2221 return err; 2222 } 2223 2224 static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu) 2225 { 2226 ip6gre_tnl_link_config_common(t); 2227 ip6gre_tnl_link_config_route(t, set_mtu, ip6erspan_calc_hlen(t)); 2228 } 2229 2230 static int ip6erspan_tnl_change(struct ip6_tnl *t, 2231 const struct __ip6_tnl_parm *p, int set_mtu) 2232 { 2233 ip6gre_tnl_copy_tnl_parm(t, p); 2234 ip6erspan_tnl_link_config(t, set_mtu); 2235 return 0; 2236 } 2237 2238 static int ip6erspan_changelink(struct net_device *dev, struct nlattr *tb[], 2239 struct nlattr *data[], 2240 struct netlink_ext_ack *extack) 2241 { 2242 struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id); 2243 struct __ip6_tnl_parm p; 2244 struct ip6_tnl *t; 2245 2246 t = ip6gre_changelink_common(dev, tb, data, &p, extack); 2247 if (IS_ERR(t)) 2248 return PTR_ERR(t); 2249 2250 ip6gre_tunnel_unlink_md(ign, t); 2251 ip6gre_tunnel_unlink(ign, t); 2252 ip6erspan_tnl_change(t, &p, !tb[IFLA_MTU]); 2253 ip6erspan_tunnel_link_md(ign, t); 2254 ip6gre_tunnel_link(ign, t); 2255 return 0; 2256 } 2257 2258 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = { 2259 .kind = "ip6gre", 2260 .maxtype = IFLA_GRE_MAX, 2261 .policy = ip6gre_policy, 2262 .priv_size = sizeof(struct ip6_tnl), 2263 .setup = ip6gre_tunnel_setup, 2264 .validate = ip6gre_tunnel_validate, 2265 .newlink = ip6gre_newlink, 2266 .changelink = ip6gre_changelink, 2267 .dellink = ip6gre_dellink, 2268 .get_size = ip6gre_get_size, 2269 .fill_info = ip6gre_fill_info, 2270 .get_link_net = ip6_tnl_get_link_net, 2271 }; 2272 2273 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = { 2274 .kind = "ip6gretap", 2275 .maxtype = IFLA_GRE_MAX, 2276 .policy = ip6gre_policy, 2277 .priv_size = sizeof(struct ip6_tnl), 2278 .setup = ip6gre_tap_setup, 2279 .validate = ip6gre_tap_validate, 2280 .newlink = ip6gre_newlink, 2281 .changelink = ip6gre_changelink, 2282 .get_size = ip6gre_get_size, 2283 .fill_info = ip6gre_fill_info, 2284 .get_link_net = ip6_tnl_get_link_net, 2285 }; 2286 2287 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly = { 2288 .kind = "ip6erspan", 2289 .maxtype = IFLA_GRE_MAX, 2290 .policy = ip6gre_policy, 2291 .priv_size = sizeof(struct ip6_tnl), 2292 .setup = ip6erspan_tap_setup, 2293 .validate = ip6erspan_tap_validate, 2294 .newlink = ip6erspan_newlink, 2295 .changelink = ip6erspan_changelink, 2296 .get_size = ip6gre_get_size, 2297 .fill_info = ip6gre_fill_info, 2298 .get_link_net = ip6_tnl_get_link_net, 2299 }; 2300 2301 /* 2302 * And now the modules code and kernel interface. 2303 */ 2304 2305 static int __init ip6gre_init(void) 2306 { 2307 int err; 2308 2309 pr_info("GRE over IPv6 tunneling driver\n"); 2310 2311 err = register_pernet_device(&ip6gre_net_ops); 2312 if (err < 0) 2313 return err; 2314 2315 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE); 2316 if (err < 0) { 2317 pr_info("%s: can't add protocol\n", __func__); 2318 goto add_proto_failed; 2319 } 2320 2321 err = rtnl_link_register(&ip6gre_link_ops); 2322 if (err < 0) 2323 goto rtnl_link_failed; 2324 2325 err = rtnl_link_register(&ip6gre_tap_ops); 2326 if (err < 0) 2327 goto tap_ops_failed; 2328 2329 err = rtnl_link_register(&ip6erspan_tap_ops); 2330 if (err < 0) 2331 goto erspan_link_failed; 2332 2333 out: 2334 return err; 2335 2336 erspan_link_failed: 2337 rtnl_link_unregister(&ip6gre_tap_ops); 2338 tap_ops_failed: 2339 rtnl_link_unregister(&ip6gre_link_ops); 2340 rtnl_link_failed: 2341 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE); 2342 add_proto_failed: 2343 unregister_pernet_device(&ip6gre_net_ops); 2344 goto out; 2345 } 2346 2347 static void __exit ip6gre_fini(void) 2348 { 2349 rtnl_link_unregister(&ip6gre_tap_ops); 2350 rtnl_link_unregister(&ip6gre_link_ops); 2351 rtnl_link_unregister(&ip6erspan_tap_ops); 2352 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE); 2353 unregister_pernet_device(&ip6gre_net_ops); 2354 } 2355 2356 module_init(ip6gre_init); 2357 module_exit(ip6gre_fini); 2358 MODULE_LICENSE("GPL"); 2359 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)"); 2360 MODULE_DESCRIPTION("GRE over IPv6 tunneling device"); 2361 MODULE_ALIAS_RTNL_LINK("ip6gre"); 2362 MODULE_ALIAS_RTNL_LINK("ip6gretap"); 2363 MODULE_ALIAS_RTNL_LINK("ip6erspan"); 2364 MODULE_ALIAS_NETDEV("ip6gre0"); 2365