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 * ip6gre_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 ip6_tnl *t = netdev_priv(dev); 931 struct dst_entry *dst = skb_dst(skb); 932 struct net_device_stats *stats; 933 bool truncate = false; 934 int encap_limit = -1; 935 __u8 dsfield = false; 936 struct flowi6 fl6; 937 int err = -EINVAL; 938 __u32 mtu; 939 int nhoff; 940 int thoff; 941 942 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr)) 943 goto tx_err; 944 945 if (gre_handle_offloads(skb, false)) 946 goto tx_err; 947 948 if (skb->len > dev->mtu + dev->hard_header_len) { 949 pskb_trim(skb, dev->mtu + dev->hard_header_len); 950 truncate = true; 951 } 952 953 nhoff = skb_network_header(skb) - skb_mac_header(skb); 954 if (skb->protocol == htons(ETH_P_IP) && 955 (ntohs(ip_hdr(skb)->tot_len) > skb->len - nhoff)) 956 truncate = true; 957 958 thoff = skb_transport_header(skb) - skb_mac_header(skb); 959 if (skb->protocol == htons(ETH_P_IPV6) && 960 (ntohs(ipv6_hdr(skb)->payload_len) > skb->len - thoff)) 961 truncate = true; 962 963 if (skb_cow_head(skb, dev->needed_headroom ?: t->hlen)) 964 goto tx_err; 965 966 t->parms.o_flags &= ~TUNNEL_KEY; 967 IPCB(skb)->flags = 0; 968 969 /* For collect_md mode, derive fl6 from the tunnel key, 970 * for native mode, call prepare_ip6gre_xmit_{ipv4,ipv6}. 971 */ 972 if (t->parms.collect_md) { 973 struct ip_tunnel_info *tun_info; 974 const struct ip_tunnel_key *key; 975 struct erspan_metadata *md; 976 __be32 tun_id; 977 978 tun_info = skb_tunnel_info(skb); 979 if (unlikely(!tun_info || 980 !(tun_info->mode & IP_TUNNEL_INFO_TX) || 981 ip_tunnel_info_af(tun_info) != AF_INET6)) 982 return -EINVAL; 983 984 key = &tun_info->key; 985 memset(&fl6, 0, sizeof(fl6)); 986 fl6.flowi6_proto = IPPROTO_GRE; 987 fl6.daddr = key->u.ipv6.dst; 988 fl6.flowlabel = key->label; 989 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL); 990 991 dsfield = key->tos; 992 if (!(tun_info->key.tun_flags & TUNNEL_ERSPAN_OPT)) 993 goto tx_err; 994 md = ip_tunnel_info_opts(tun_info); 995 if (!md) 996 goto tx_err; 997 998 tun_id = tunnel_id_to_key32(key->tun_id); 999 if (md->version == 1) { 1000 erspan_build_header(skb, 1001 ntohl(tun_id), 1002 ntohl(md->u.index), truncate, 1003 false); 1004 } else if (md->version == 2) { 1005 erspan_build_header_v2(skb, 1006 ntohl(tun_id), 1007 md->u.md2.dir, 1008 get_hwid(&md->u.md2), 1009 truncate, false); 1010 } else { 1011 goto tx_err; 1012 } 1013 } else { 1014 struct ipv6hdr *ipv6h = ipv6_hdr(skb); 1015 1016 switch (skb->protocol) { 1017 case htons(ETH_P_IP): 1018 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); 1019 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6, 1020 &dsfield, &encap_limit); 1021 break; 1022 case htons(ETH_P_IPV6): 1023 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr)) 1024 goto tx_err; 1025 if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, 1026 &dsfield, &encap_limit)) 1027 goto tx_err; 1028 break; 1029 default: 1030 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); 1031 break; 1032 } 1033 1034 if (t->parms.erspan_ver == 1) 1035 erspan_build_header(skb, ntohl(t->parms.o_key), 1036 t->parms.index, 1037 truncate, false); 1038 else if (t->parms.erspan_ver == 2) 1039 erspan_build_header_v2(skb, ntohl(t->parms.o_key), 1040 t->parms.dir, 1041 t->parms.hwid, 1042 truncate, false); 1043 else 1044 goto tx_err; 1045 1046 fl6.daddr = t->parms.raddr; 1047 } 1048 1049 /* Push GRE header. */ 1050 gre_build_header(skb, 8, TUNNEL_SEQ, 1051 htons(ETH_P_ERSPAN), 0, htonl(t->o_seqno++)); 1052 1053 /* TooBig packet may have updated dst->dev's mtu */ 1054 if (!t->parms.collect_md && dst && dst_mtu(dst) > dst->dev->mtu) 1055 dst->ops->update_pmtu(dst, NULL, skb, dst->dev->mtu); 1056 1057 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, 1058 NEXTHDR_GRE); 1059 if (err != 0) { 1060 /* XXX: send ICMP error even if DF is not set. */ 1061 if (err == -EMSGSIZE) { 1062 if (skb->protocol == htons(ETH_P_IP)) 1063 icmp_send(skb, ICMP_DEST_UNREACH, 1064 ICMP_FRAG_NEEDED, htonl(mtu)); 1065 else 1066 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 1067 } 1068 1069 goto tx_err; 1070 } 1071 return NETDEV_TX_OK; 1072 1073 tx_err: 1074 stats = &t->dev->stats; 1075 stats->tx_errors++; 1076 stats->tx_dropped++; 1077 kfree_skb(skb); 1078 return NETDEV_TX_OK; 1079 } 1080 1081 static void ip6gre_tnl_link_config_common(struct ip6_tnl *t) 1082 { 1083 struct net_device *dev = t->dev; 1084 struct __ip6_tnl_parm *p = &t->parms; 1085 struct flowi6 *fl6 = &t->fl.u.ip6; 1086 1087 if (dev->type != ARPHRD_ETHER) { 1088 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); 1089 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); 1090 } 1091 1092 /* Set up flowi template */ 1093 fl6->saddr = p->laddr; 1094 fl6->daddr = p->raddr; 1095 fl6->flowi6_oif = p->link; 1096 fl6->flowlabel = 0; 1097 fl6->flowi6_proto = IPPROTO_GRE; 1098 1099 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) 1100 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; 1101 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) 1102 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; 1103 1104 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET); 1105 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr); 1106 1107 if (p->flags&IP6_TNL_F_CAP_XMIT && 1108 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER) 1109 dev->flags |= IFF_POINTOPOINT; 1110 else 1111 dev->flags &= ~IFF_POINTOPOINT; 1112 } 1113 1114 static void ip6gre_tnl_link_config_route(struct ip6_tnl *t, int set_mtu, 1115 int t_hlen) 1116 { 1117 const struct __ip6_tnl_parm *p = &t->parms; 1118 struct net_device *dev = t->dev; 1119 1120 if (p->flags & IP6_TNL_F_CAP_XMIT) { 1121 int strict = (ipv6_addr_type(&p->raddr) & 1122 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); 1123 1124 struct rt6_info *rt = rt6_lookup(t->net, 1125 &p->raddr, &p->laddr, 1126 p->link, NULL, strict); 1127 1128 if (!rt) 1129 return; 1130 1131 if (rt->dst.dev) { 1132 dev->needed_headroom = rt->dst.dev->hard_header_len + 1133 t_hlen; 1134 1135 if (set_mtu) { 1136 dev->mtu = rt->dst.dev->mtu - t_hlen; 1137 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1138 dev->mtu -= 8; 1139 if (dev->type == ARPHRD_ETHER) 1140 dev->mtu -= ETH_HLEN; 1141 1142 if (dev->mtu < IPV6_MIN_MTU) 1143 dev->mtu = IPV6_MIN_MTU; 1144 } 1145 } 1146 ip6_rt_put(rt); 1147 } 1148 } 1149 1150 static int ip6gre_calc_hlen(struct ip6_tnl *tunnel) 1151 { 1152 int t_hlen; 1153 1154 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags); 1155 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen; 1156 1157 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr); 1158 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen; 1159 return t_hlen; 1160 } 1161 1162 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu) 1163 { 1164 ip6gre_tnl_link_config_common(t); 1165 ip6gre_tnl_link_config_route(t, set_mtu, ip6gre_calc_hlen(t)); 1166 } 1167 1168 static void ip6gre_tnl_copy_tnl_parm(struct ip6_tnl *t, 1169 const struct __ip6_tnl_parm *p) 1170 { 1171 t->parms.laddr = p->laddr; 1172 t->parms.raddr = p->raddr; 1173 t->parms.flags = p->flags; 1174 t->parms.hop_limit = p->hop_limit; 1175 t->parms.encap_limit = p->encap_limit; 1176 t->parms.flowinfo = p->flowinfo; 1177 t->parms.link = p->link; 1178 t->parms.proto = p->proto; 1179 t->parms.i_key = p->i_key; 1180 t->parms.o_key = p->o_key; 1181 t->parms.i_flags = p->i_flags; 1182 t->parms.o_flags = p->o_flags; 1183 t->parms.fwmark = p->fwmark; 1184 dst_cache_reset(&t->dst_cache); 1185 } 1186 1187 static int ip6gre_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p, 1188 int set_mtu) 1189 { 1190 ip6gre_tnl_copy_tnl_parm(t, p); 1191 ip6gre_tnl_link_config(t, set_mtu); 1192 return 0; 1193 } 1194 1195 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p, 1196 const struct ip6_tnl_parm2 *u) 1197 { 1198 p->laddr = u->laddr; 1199 p->raddr = u->raddr; 1200 p->flags = u->flags; 1201 p->hop_limit = u->hop_limit; 1202 p->encap_limit = u->encap_limit; 1203 p->flowinfo = u->flowinfo; 1204 p->link = u->link; 1205 p->i_key = u->i_key; 1206 p->o_key = u->o_key; 1207 p->i_flags = gre_flags_to_tnl_flags(u->i_flags); 1208 p->o_flags = gre_flags_to_tnl_flags(u->o_flags); 1209 memcpy(p->name, u->name, sizeof(u->name)); 1210 } 1211 1212 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u, 1213 const struct __ip6_tnl_parm *p) 1214 { 1215 u->proto = IPPROTO_GRE; 1216 u->laddr = p->laddr; 1217 u->raddr = p->raddr; 1218 u->flags = p->flags; 1219 u->hop_limit = p->hop_limit; 1220 u->encap_limit = p->encap_limit; 1221 u->flowinfo = p->flowinfo; 1222 u->link = p->link; 1223 u->i_key = p->i_key; 1224 u->o_key = p->o_key; 1225 u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags); 1226 u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags); 1227 memcpy(u->name, p->name, sizeof(u->name)); 1228 } 1229 1230 static int ip6gre_tunnel_ioctl(struct net_device *dev, 1231 struct ifreq *ifr, int cmd) 1232 { 1233 int err = 0; 1234 struct ip6_tnl_parm2 p; 1235 struct __ip6_tnl_parm p1; 1236 struct ip6_tnl *t = netdev_priv(dev); 1237 struct net *net = t->net; 1238 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1239 1240 memset(&p1, 0, sizeof(p1)); 1241 1242 switch (cmd) { 1243 case SIOCGETTUNNEL: 1244 if (dev == ign->fb_tunnel_dev) { 1245 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { 1246 err = -EFAULT; 1247 break; 1248 } 1249 ip6gre_tnl_parm_from_user(&p1, &p); 1250 t = ip6gre_tunnel_locate(net, &p1, 0); 1251 if (!t) 1252 t = netdev_priv(dev); 1253 } 1254 memset(&p, 0, sizeof(p)); 1255 ip6gre_tnl_parm_to_user(&p, &t->parms); 1256 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) 1257 err = -EFAULT; 1258 break; 1259 1260 case SIOCADDTUNNEL: 1261 case SIOCCHGTUNNEL: 1262 err = -EPERM; 1263 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1264 goto done; 1265 1266 err = -EFAULT; 1267 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 1268 goto done; 1269 1270 err = -EINVAL; 1271 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING)) 1272 goto done; 1273 1274 if (!(p.i_flags&GRE_KEY)) 1275 p.i_key = 0; 1276 if (!(p.o_flags&GRE_KEY)) 1277 p.o_key = 0; 1278 1279 ip6gre_tnl_parm_from_user(&p1, &p); 1280 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL); 1281 1282 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { 1283 if (t) { 1284 if (t->dev != dev) { 1285 err = -EEXIST; 1286 break; 1287 } 1288 } else { 1289 t = netdev_priv(dev); 1290 1291 ip6gre_tunnel_unlink(ign, t); 1292 synchronize_net(); 1293 ip6gre_tnl_change(t, &p1, 1); 1294 ip6gre_tunnel_link(ign, t); 1295 netdev_state_change(dev); 1296 } 1297 } 1298 1299 if (t) { 1300 err = 0; 1301 1302 memset(&p, 0, sizeof(p)); 1303 ip6gre_tnl_parm_to_user(&p, &t->parms); 1304 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) 1305 err = -EFAULT; 1306 } else 1307 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); 1308 break; 1309 1310 case SIOCDELTUNNEL: 1311 err = -EPERM; 1312 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1313 goto done; 1314 1315 if (dev == ign->fb_tunnel_dev) { 1316 err = -EFAULT; 1317 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 1318 goto done; 1319 err = -ENOENT; 1320 ip6gre_tnl_parm_from_user(&p1, &p); 1321 t = ip6gre_tunnel_locate(net, &p1, 0); 1322 if (!t) 1323 goto done; 1324 err = -EPERM; 1325 if (t == netdev_priv(ign->fb_tunnel_dev)) 1326 goto done; 1327 dev = t->dev; 1328 } 1329 unregister_netdevice(dev); 1330 err = 0; 1331 break; 1332 1333 default: 1334 err = -EINVAL; 1335 } 1336 1337 done: 1338 return err; 1339 } 1340 1341 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev, 1342 unsigned short type, const void *daddr, 1343 const void *saddr, unsigned int len) 1344 { 1345 struct ip6_tnl *t = netdev_priv(dev); 1346 struct ipv6hdr *ipv6h; 1347 __be16 *p; 1348 1349 ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h)); 1350 ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb, 1351 t->fl.u.ip6.flowlabel, 1352 true, &t->fl.u.ip6)); 1353 ipv6h->hop_limit = t->parms.hop_limit; 1354 ipv6h->nexthdr = NEXTHDR_GRE; 1355 ipv6h->saddr = t->parms.laddr; 1356 ipv6h->daddr = t->parms.raddr; 1357 1358 p = (__be16 *)(ipv6h + 1); 1359 p[0] = t->parms.o_flags; 1360 p[1] = htons(type); 1361 1362 /* 1363 * Set the source hardware address. 1364 */ 1365 1366 if (saddr) 1367 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr)); 1368 if (daddr) 1369 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr)); 1370 if (!ipv6_addr_any(&ipv6h->daddr)) 1371 return t->hlen; 1372 1373 return -t->hlen; 1374 } 1375 1376 static const struct header_ops ip6gre_header_ops = { 1377 .create = ip6gre_header, 1378 }; 1379 1380 static const struct net_device_ops ip6gre_netdev_ops = { 1381 .ndo_init = ip6gre_tunnel_init, 1382 .ndo_uninit = ip6gre_tunnel_uninit, 1383 .ndo_start_xmit = ip6gre_tunnel_xmit, 1384 .ndo_do_ioctl = ip6gre_tunnel_ioctl, 1385 .ndo_change_mtu = ip6_tnl_change_mtu, 1386 .ndo_get_stats64 = ip_tunnel_get_stats64, 1387 .ndo_get_iflink = ip6_tnl_get_iflink, 1388 }; 1389 1390 static void ip6gre_dev_free(struct net_device *dev) 1391 { 1392 struct ip6_tnl *t = netdev_priv(dev); 1393 1394 gro_cells_destroy(&t->gro_cells); 1395 dst_cache_destroy(&t->dst_cache); 1396 free_percpu(dev->tstats); 1397 } 1398 1399 static void ip6gre_tunnel_setup(struct net_device *dev) 1400 { 1401 dev->netdev_ops = &ip6gre_netdev_ops; 1402 dev->needs_free_netdev = true; 1403 dev->priv_destructor = ip6gre_dev_free; 1404 1405 dev->type = ARPHRD_IP6GRE; 1406 1407 dev->flags |= IFF_NOARP; 1408 dev->addr_len = sizeof(struct in6_addr); 1409 netif_keep_dst(dev); 1410 /* This perm addr will be used as interface identifier by IPv6 */ 1411 dev->addr_assign_type = NET_ADDR_RANDOM; 1412 eth_random_addr(dev->perm_addr); 1413 } 1414 1415 #define GRE6_FEATURES (NETIF_F_SG | \ 1416 NETIF_F_FRAGLIST | \ 1417 NETIF_F_HIGHDMA | \ 1418 NETIF_F_HW_CSUM) 1419 1420 static void ip6gre_tnl_init_features(struct net_device *dev) 1421 { 1422 struct ip6_tnl *nt = netdev_priv(dev); 1423 1424 dev->features |= GRE6_FEATURES; 1425 dev->hw_features |= GRE6_FEATURES; 1426 1427 if (!(nt->parms.o_flags & TUNNEL_SEQ)) { 1428 /* TCP offload with GRE SEQ is not supported, nor 1429 * can we support 2 levels of outer headers requiring 1430 * an update. 1431 */ 1432 if (!(nt->parms.o_flags & TUNNEL_CSUM) || 1433 nt->encap.type == TUNNEL_ENCAP_NONE) { 1434 dev->features |= NETIF_F_GSO_SOFTWARE; 1435 dev->hw_features |= NETIF_F_GSO_SOFTWARE; 1436 } 1437 1438 /* Can use a lockless transmit, unless we generate 1439 * output sequences 1440 */ 1441 dev->features |= NETIF_F_LLTX; 1442 } 1443 } 1444 1445 static int ip6gre_tunnel_init_common(struct net_device *dev) 1446 { 1447 struct ip6_tnl *tunnel; 1448 int ret; 1449 int t_hlen; 1450 1451 tunnel = netdev_priv(dev); 1452 1453 tunnel->dev = dev; 1454 tunnel->net = dev_net(dev); 1455 strcpy(tunnel->parms.name, dev->name); 1456 1457 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 1458 if (!dev->tstats) 1459 return -ENOMEM; 1460 1461 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); 1462 if (ret) 1463 goto cleanup_alloc_pcpu_stats; 1464 1465 ret = gro_cells_init(&tunnel->gro_cells, dev); 1466 if (ret) 1467 goto cleanup_dst_cache_init; 1468 1469 t_hlen = ip6gre_calc_hlen(tunnel); 1470 dev->mtu = ETH_DATA_LEN - t_hlen; 1471 if (dev->type == ARPHRD_ETHER) 1472 dev->mtu -= ETH_HLEN; 1473 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1474 dev->mtu -= 8; 1475 1476 if (tunnel->parms.collect_md) { 1477 dev->features |= NETIF_F_NETNS_LOCAL; 1478 netif_keep_dst(dev); 1479 } 1480 ip6gre_tnl_init_features(dev); 1481 1482 return 0; 1483 1484 cleanup_dst_cache_init: 1485 dst_cache_destroy(&tunnel->dst_cache); 1486 cleanup_alloc_pcpu_stats: 1487 free_percpu(dev->tstats); 1488 dev->tstats = NULL; 1489 return ret; 1490 } 1491 1492 static int ip6gre_tunnel_init(struct net_device *dev) 1493 { 1494 struct ip6_tnl *tunnel; 1495 int ret; 1496 1497 ret = ip6gre_tunnel_init_common(dev); 1498 if (ret) 1499 return ret; 1500 1501 tunnel = netdev_priv(dev); 1502 1503 if (tunnel->parms.collect_md) 1504 return 0; 1505 1506 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr)); 1507 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr)); 1508 1509 if (ipv6_addr_any(&tunnel->parms.raddr)) 1510 dev->header_ops = &ip6gre_header_ops; 1511 1512 return 0; 1513 } 1514 1515 static void ip6gre_fb_tunnel_init(struct net_device *dev) 1516 { 1517 struct ip6_tnl *tunnel = netdev_priv(dev); 1518 1519 tunnel->dev = dev; 1520 tunnel->net = dev_net(dev); 1521 strcpy(tunnel->parms.name, dev->name); 1522 1523 tunnel->hlen = sizeof(struct ipv6hdr) + 4; 1524 1525 dev_hold(dev); 1526 } 1527 1528 static struct inet6_protocol ip6gre_protocol __read_mostly = { 1529 .handler = gre_rcv, 1530 .err_handler = ip6gre_err, 1531 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 1532 }; 1533 1534 static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head) 1535 { 1536 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1537 struct net_device *dev, *aux; 1538 int prio; 1539 1540 for_each_netdev_safe(net, dev, aux) 1541 if (dev->rtnl_link_ops == &ip6gre_link_ops || 1542 dev->rtnl_link_ops == &ip6gre_tap_ops || 1543 dev->rtnl_link_ops == &ip6erspan_tap_ops) 1544 unregister_netdevice_queue(dev, head); 1545 1546 for (prio = 0; prio < 4; prio++) { 1547 int h; 1548 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) { 1549 struct ip6_tnl *t; 1550 1551 t = rtnl_dereference(ign->tunnels[prio][h]); 1552 1553 while (t) { 1554 /* If dev is in the same netns, it has already 1555 * been added to the list by the previous loop. 1556 */ 1557 if (!net_eq(dev_net(t->dev), net)) 1558 unregister_netdevice_queue(t->dev, 1559 head); 1560 t = rtnl_dereference(t->next); 1561 } 1562 } 1563 } 1564 } 1565 1566 static int __net_init ip6gre_init_net(struct net *net) 1567 { 1568 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1569 int err; 1570 1571 if (!net_has_fallback_tunnels(net)) 1572 return 0; 1573 ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0", 1574 NET_NAME_UNKNOWN, 1575 ip6gre_tunnel_setup); 1576 if (!ign->fb_tunnel_dev) { 1577 err = -ENOMEM; 1578 goto err_alloc_dev; 1579 } 1580 dev_net_set(ign->fb_tunnel_dev, net); 1581 /* FB netdevice is special: we have one, and only one per netns. 1582 * Allowing to move it to another netns is clearly unsafe. 1583 */ 1584 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL; 1585 1586 1587 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev); 1588 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops; 1589 1590 err = register_netdev(ign->fb_tunnel_dev); 1591 if (err) 1592 goto err_reg_dev; 1593 1594 rcu_assign_pointer(ign->tunnels_wc[0], 1595 netdev_priv(ign->fb_tunnel_dev)); 1596 return 0; 1597 1598 err_reg_dev: 1599 free_netdev(ign->fb_tunnel_dev); 1600 err_alloc_dev: 1601 return err; 1602 } 1603 1604 static void __net_exit ip6gre_exit_batch_net(struct list_head *net_list) 1605 { 1606 struct net *net; 1607 LIST_HEAD(list); 1608 1609 rtnl_lock(); 1610 list_for_each_entry(net, net_list, exit_list) 1611 ip6gre_destroy_tunnels(net, &list); 1612 unregister_netdevice_many(&list); 1613 rtnl_unlock(); 1614 } 1615 1616 static struct pernet_operations ip6gre_net_ops = { 1617 .init = ip6gre_init_net, 1618 .exit_batch = ip6gre_exit_batch_net, 1619 .id = &ip6gre_net_id, 1620 .size = sizeof(struct ip6gre_net), 1621 }; 1622 1623 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[], 1624 struct netlink_ext_ack *extack) 1625 { 1626 __be16 flags; 1627 1628 if (!data) 1629 return 0; 1630 1631 flags = 0; 1632 if (data[IFLA_GRE_IFLAGS]) 1633 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); 1634 if (data[IFLA_GRE_OFLAGS]) 1635 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); 1636 if (flags & (GRE_VERSION|GRE_ROUTING)) 1637 return -EINVAL; 1638 1639 return 0; 1640 } 1641 1642 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[], 1643 struct netlink_ext_ack *extack) 1644 { 1645 struct in6_addr daddr; 1646 1647 if (tb[IFLA_ADDRESS]) { 1648 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 1649 return -EINVAL; 1650 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 1651 return -EADDRNOTAVAIL; 1652 } 1653 1654 if (!data) 1655 goto out; 1656 1657 if (data[IFLA_GRE_REMOTE]) { 1658 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]); 1659 if (ipv6_addr_any(&daddr)) 1660 return -EINVAL; 1661 } 1662 1663 out: 1664 return ip6gre_tunnel_validate(tb, data, extack); 1665 } 1666 1667 static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[], 1668 struct netlink_ext_ack *extack) 1669 { 1670 __be16 flags = 0; 1671 int ret, ver = 0; 1672 1673 if (!data) 1674 return 0; 1675 1676 ret = ip6gre_tap_validate(tb, data, extack); 1677 if (ret) 1678 return ret; 1679 1680 /* ERSPAN should only have GRE sequence and key flag */ 1681 if (data[IFLA_GRE_OFLAGS]) 1682 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); 1683 if (data[IFLA_GRE_IFLAGS]) 1684 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); 1685 if (!data[IFLA_GRE_COLLECT_METADATA] && 1686 flags != (GRE_SEQ | GRE_KEY)) 1687 return -EINVAL; 1688 1689 /* ERSPAN Session ID only has 10-bit. Since we reuse 1690 * 32-bit key field as ID, check it's range. 1691 */ 1692 if (data[IFLA_GRE_IKEY] && 1693 (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK)) 1694 return -EINVAL; 1695 1696 if (data[IFLA_GRE_OKEY] && 1697 (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK)) 1698 return -EINVAL; 1699 1700 if (data[IFLA_GRE_ERSPAN_VER]) { 1701 ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]); 1702 if (ver != 1 && ver != 2) 1703 return -EINVAL; 1704 } 1705 1706 if (ver == 1) { 1707 if (data[IFLA_GRE_ERSPAN_INDEX]) { 1708 u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]); 1709 1710 if (index & ~INDEX_MASK) 1711 return -EINVAL; 1712 } 1713 } else if (ver == 2) { 1714 if (data[IFLA_GRE_ERSPAN_DIR]) { 1715 u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]); 1716 1717 if (dir & ~(DIR_MASK >> DIR_OFFSET)) 1718 return -EINVAL; 1719 } 1720 1721 if (data[IFLA_GRE_ERSPAN_HWID]) { 1722 u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]); 1723 1724 if (hwid & ~(HWID_MASK >> HWID_OFFSET)) 1725 return -EINVAL; 1726 } 1727 } 1728 1729 return 0; 1730 } 1731 1732 static void ip6gre_netlink_parms(struct nlattr *data[], 1733 struct __ip6_tnl_parm *parms) 1734 { 1735 memset(parms, 0, sizeof(*parms)); 1736 1737 if (!data) 1738 return; 1739 1740 if (data[IFLA_GRE_LINK]) 1741 parms->link = nla_get_u32(data[IFLA_GRE_LINK]); 1742 1743 if (data[IFLA_GRE_IFLAGS]) 1744 parms->i_flags = gre_flags_to_tnl_flags( 1745 nla_get_be16(data[IFLA_GRE_IFLAGS])); 1746 1747 if (data[IFLA_GRE_OFLAGS]) 1748 parms->o_flags = gre_flags_to_tnl_flags( 1749 nla_get_be16(data[IFLA_GRE_OFLAGS])); 1750 1751 if (data[IFLA_GRE_IKEY]) 1752 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]); 1753 1754 if (data[IFLA_GRE_OKEY]) 1755 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]); 1756 1757 if (data[IFLA_GRE_LOCAL]) 1758 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]); 1759 1760 if (data[IFLA_GRE_REMOTE]) 1761 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]); 1762 1763 if (data[IFLA_GRE_TTL]) 1764 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]); 1765 1766 if (data[IFLA_GRE_ENCAP_LIMIT]) 1767 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]); 1768 1769 if (data[IFLA_GRE_FLOWINFO]) 1770 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]); 1771 1772 if (data[IFLA_GRE_FLAGS]) 1773 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]); 1774 1775 if (data[IFLA_GRE_FWMARK]) 1776 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]); 1777 1778 if (data[IFLA_GRE_COLLECT_METADATA]) 1779 parms->collect_md = true; 1780 1781 if (data[IFLA_GRE_ERSPAN_VER]) 1782 parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]); 1783 1784 if (parms->erspan_ver == 1) { 1785 if (data[IFLA_GRE_ERSPAN_INDEX]) 1786 parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]); 1787 } else if (parms->erspan_ver == 2) { 1788 if (data[IFLA_GRE_ERSPAN_DIR]) 1789 parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]); 1790 if (data[IFLA_GRE_ERSPAN_HWID]) 1791 parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]); 1792 } 1793 } 1794 1795 static int ip6gre_tap_init(struct net_device *dev) 1796 { 1797 int ret; 1798 1799 ret = ip6gre_tunnel_init_common(dev); 1800 if (ret) 1801 return ret; 1802 1803 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 1804 1805 return 0; 1806 } 1807 1808 static const struct net_device_ops ip6gre_tap_netdev_ops = { 1809 .ndo_init = ip6gre_tap_init, 1810 .ndo_uninit = ip6gre_tunnel_uninit, 1811 .ndo_start_xmit = ip6gre_tunnel_xmit, 1812 .ndo_set_mac_address = eth_mac_addr, 1813 .ndo_validate_addr = eth_validate_addr, 1814 .ndo_change_mtu = ip6_tnl_change_mtu, 1815 .ndo_get_stats64 = ip_tunnel_get_stats64, 1816 .ndo_get_iflink = ip6_tnl_get_iflink, 1817 }; 1818 1819 static int ip6erspan_calc_hlen(struct ip6_tnl *tunnel) 1820 { 1821 int t_hlen; 1822 1823 tunnel->tun_hlen = 8; 1824 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen + 1825 erspan_hdr_len(tunnel->parms.erspan_ver); 1826 1827 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr); 1828 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen; 1829 return t_hlen; 1830 } 1831 1832 static int ip6erspan_tap_init(struct net_device *dev) 1833 { 1834 struct ip6_tnl *tunnel; 1835 int t_hlen; 1836 int ret; 1837 1838 tunnel = netdev_priv(dev); 1839 1840 tunnel->dev = dev; 1841 tunnel->net = dev_net(dev); 1842 strcpy(tunnel->parms.name, dev->name); 1843 1844 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 1845 if (!dev->tstats) 1846 return -ENOMEM; 1847 1848 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); 1849 if (ret) 1850 goto cleanup_alloc_pcpu_stats; 1851 1852 ret = gro_cells_init(&tunnel->gro_cells, dev); 1853 if (ret) 1854 goto cleanup_dst_cache_init; 1855 1856 t_hlen = ip6erspan_calc_hlen(tunnel); 1857 dev->mtu = ETH_DATA_LEN - t_hlen; 1858 if (dev->type == ARPHRD_ETHER) 1859 dev->mtu -= ETH_HLEN; 1860 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1861 dev->mtu -= 8; 1862 1863 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 1864 ip6erspan_tnl_link_config(tunnel, 1); 1865 1866 return 0; 1867 1868 cleanup_dst_cache_init: 1869 dst_cache_destroy(&tunnel->dst_cache); 1870 cleanup_alloc_pcpu_stats: 1871 free_percpu(dev->tstats); 1872 dev->tstats = NULL; 1873 return ret; 1874 } 1875 1876 static const struct net_device_ops ip6erspan_netdev_ops = { 1877 .ndo_init = ip6erspan_tap_init, 1878 .ndo_uninit = ip6erspan_tunnel_uninit, 1879 .ndo_start_xmit = ip6erspan_tunnel_xmit, 1880 .ndo_set_mac_address = eth_mac_addr, 1881 .ndo_validate_addr = eth_validate_addr, 1882 .ndo_change_mtu = ip6_tnl_change_mtu, 1883 .ndo_get_stats64 = ip_tunnel_get_stats64, 1884 .ndo_get_iflink = ip6_tnl_get_iflink, 1885 }; 1886 1887 static void ip6gre_tap_setup(struct net_device *dev) 1888 { 1889 1890 ether_setup(dev); 1891 1892 dev->max_mtu = 0; 1893 dev->netdev_ops = &ip6gre_tap_netdev_ops; 1894 dev->needs_free_netdev = true; 1895 dev->priv_destructor = ip6gre_dev_free; 1896 1897 dev->features |= NETIF_F_NETNS_LOCAL; 1898 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1899 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 1900 netif_keep_dst(dev); 1901 } 1902 1903 bool is_ip6gretap_dev(const struct net_device *dev) 1904 { 1905 return dev->netdev_ops == &ip6gre_tap_netdev_ops; 1906 } 1907 EXPORT_SYMBOL_GPL(is_ip6gretap_dev); 1908 1909 static bool ip6gre_netlink_encap_parms(struct nlattr *data[], 1910 struct ip_tunnel_encap *ipencap) 1911 { 1912 bool ret = false; 1913 1914 memset(ipencap, 0, sizeof(*ipencap)); 1915 1916 if (!data) 1917 return ret; 1918 1919 if (data[IFLA_GRE_ENCAP_TYPE]) { 1920 ret = true; 1921 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]); 1922 } 1923 1924 if (data[IFLA_GRE_ENCAP_FLAGS]) { 1925 ret = true; 1926 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]); 1927 } 1928 1929 if (data[IFLA_GRE_ENCAP_SPORT]) { 1930 ret = true; 1931 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]); 1932 } 1933 1934 if (data[IFLA_GRE_ENCAP_DPORT]) { 1935 ret = true; 1936 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]); 1937 } 1938 1939 return ret; 1940 } 1941 1942 static int ip6gre_newlink_common(struct net *src_net, struct net_device *dev, 1943 struct nlattr *tb[], struct nlattr *data[], 1944 struct netlink_ext_ack *extack) 1945 { 1946 struct ip6_tnl *nt; 1947 struct ip_tunnel_encap ipencap; 1948 int err; 1949 1950 nt = netdev_priv(dev); 1951 1952 if (ip6gre_netlink_encap_parms(data, &ipencap)) { 1953 int err = ip6_tnl_encap_setup(nt, &ipencap); 1954 1955 if (err < 0) 1956 return err; 1957 } 1958 1959 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS]) 1960 eth_hw_addr_random(dev); 1961 1962 nt->dev = dev; 1963 nt->net = dev_net(dev); 1964 1965 err = register_netdevice(dev); 1966 if (err) 1967 goto out; 1968 1969 if (tb[IFLA_MTU]) 1970 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 1971 1972 dev_hold(dev); 1973 1974 out: 1975 return err; 1976 } 1977 1978 static int ip6gre_newlink(struct net *src_net, struct net_device *dev, 1979 struct nlattr *tb[], struct nlattr *data[], 1980 struct netlink_ext_ack *extack) 1981 { 1982 struct ip6_tnl *nt = netdev_priv(dev); 1983 struct net *net = dev_net(dev); 1984 struct ip6gre_net *ign; 1985 int err; 1986 1987 ip6gre_netlink_parms(data, &nt->parms); 1988 ign = net_generic(net, ip6gre_net_id); 1989 1990 if (nt->parms.collect_md) { 1991 if (rtnl_dereference(ign->collect_md_tun)) 1992 return -EEXIST; 1993 } else { 1994 if (ip6gre_tunnel_find(net, &nt->parms, dev->type)) 1995 return -EEXIST; 1996 } 1997 1998 err = ip6gre_newlink_common(src_net, dev, tb, data, extack); 1999 if (!err) { 2000 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]); 2001 ip6gre_tunnel_link_md(ign, nt); 2002 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt); 2003 } 2004 return err; 2005 } 2006 2007 static struct ip6_tnl * 2008 ip6gre_changelink_common(struct net_device *dev, struct nlattr *tb[], 2009 struct nlattr *data[], struct __ip6_tnl_parm *p_p, 2010 struct netlink_ext_ack *extack) 2011 { 2012 struct ip6_tnl *t, *nt = netdev_priv(dev); 2013 struct net *net = nt->net; 2014 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 2015 struct ip_tunnel_encap ipencap; 2016 2017 if (dev == ign->fb_tunnel_dev) 2018 return ERR_PTR(-EINVAL); 2019 2020 if (ip6gre_netlink_encap_parms(data, &ipencap)) { 2021 int err = ip6_tnl_encap_setup(nt, &ipencap); 2022 2023 if (err < 0) 2024 return ERR_PTR(err); 2025 } 2026 2027 ip6gre_netlink_parms(data, p_p); 2028 2029 t = ip6gre_tunnel_locate(net, p_p, 0); 2030 2031 if (t) { 2032 if (t->dev != dev) 2033 return ERR_PTR(-EEXIST); 2034 } else { 2035 t = nt; 2036 } 2037 2038 return t; 2039 } 2040 2041 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[], 2042 struct nlattr *data[], 2043 struct netlink_ext_ack *extack) 2044 { 2045 struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id); 2046 struct __ip6_tnl_parm p; 2047 struct ip6_tnl *t; 2048 2049 t = ip6gre_changelink_common(dev, tb, data, &p, extack); 2050 if (IS_ERR(t)) 2051 return PTR_ERR(t); 2052 2053 ip6gre_tunnel_unlink_md(ign, t); 2054 ip6gre_tunnel_unlink(ign, t); 2055 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]); 2056 ip6gre_tunnel_link_md(ign, t); 2057 ip6gre_tunnel_link(ign, t); 2058 return 0; 2059 } 2060 2061 static void ip6gre_dellink(struct net_device *dev, struct list_head *head) 2062 { 2063 struct net *net = dev_net(dev); 2064 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 2065 2066 if (dev != ign->fb_tunnel_dev) 2067 unregister_netdevice_queue(dev, head); 2068 } 2069 2070 static size_t ip6gre_get_size(const struct net_device *dev) 2071 { 2072 return 2073 /* IFLA_GRE_LINK */ 2074 nla_total_size(4) + 2075 /* IFLA_GRE_IFLAGS */ 2076 nla_total_size(2) + 2077 /* IFLA_GRE_OFLAGS */ 2078 nla_total_size(2) + 2079 /* IFLA_GRE_IKEY */ 2080 nla_total_size(4) + 2081 /* IFLA_GRE_OKEY */ 2082 nla_total_size(4) + 2083 /* IFLA_GRE_LOCAL */ 2084 nla_total_size(sizeof(struct in6_addr)) + 2085 /* IFLA_GRE_REMOTE */ 2086 nla_total_size(sizeof(struct in6_addr)) + 2087 /* IFLA_GRE_TTL */ 2088 nla_total_size(1) + 2089 /* IFLA_GRE_ENCAP_LIMIT */ 2090 nla_total_size(1) + 2091 /* IFLA_GRE_FLOWINFO */ 2092 nla_total_size(4) + 2093 /* IFLA_GRE_FLAGS */ 2094 nla_total_size(4) + 2095 /* IFLA_GRE_ENCAP_TYPE */ 2096 nla_total_size(2) + 2097 /* IFLA_GRE_ENCAP_FLAGS */ 2098 nla_total_size(2) + 2099 /* IFLA_GRE_ENCAP_SPORT */ 2100 nla_total_size(2) + 2101 /* IFLA_GRE_ENCAP_DPORT */ 2102 nla_total_size(2) + 2103 /* IFLA_GRE_COLLECT_METADATA */ 2104 nla_total_size(0) + 2105 /* IFLA_GRE_FWMARK */ 2106 nla_total_size(4) + 2107 /* IFLA_GRE_ERSPAN_INDEX */ 2108 nla_total_size(4) + 2109 0; 2110 } 2111 2112 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev) 2113 { 2114 struct ip6_tnl *t = netdev_priv(dev); 2115 struct __ip6_tnl_parm *p = &t->parms; 2116 2117 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) || 2118 nla_put_be16(skb, IFLA_GRE_IFLAGS, 2119 gre_tnl_flags_to_gre_flags(p->i_flags)) || 2120 nla_put_be16(skb, IFLA_GRE_OFLAGS, 2121 gre_tnl_flags_to_gre_flags(p->o_flags)) || 2122 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) || 2123 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) || 2124 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) || 2125 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) || 2126 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) || 2127 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) || 2128 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) || 2129 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) || 2130 nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark) || 2131 nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index)) 2132 goto nla_put_failure; 2133 2134 if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE, 2135 t->encap.type) || 2136 nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT, 2137 t->encap.sport) || 2138 nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT, 2139 t->encap.dport) || 2140 nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS, 2141 t->encap.flags)) 2142 goto nla_put_failure; 2143 2144 if (p->collect_md) { 2145 if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA)) 2146 goto nla_put_failure; 2147 } 2148 2149 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, p->erspan_ver)) 2150 goto nla_put_failure; 2151 2152 if (p->erspan_ver == 1) { 2153 if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index)) 2154 goto nla_put_failure; 2155 } else if (p->erspan_ver == 2) { 2156 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, p->dir)) 2157 goto nla_put_failure; 2158 if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, p->hwid)) 2159 goto nla_put_failure; 2160 } 2161 2162 return 0; 2163 2164 nla_put_failure: 2165 return -EMSGSIZE; 2166 } 2167 2168 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = { 2169 [IFLA_GRE_LINK] = { .type = NLA_U32 }, 2170 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 }, 2171 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 }, 2172 [IFLA_GRE_IKEY] = { .type = NLA_U32 }, 2173 [IFLA_GRE_OKEY] = { .type = NLA_U32 }, 2174 [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) }, 2175 [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) }, 2176 [IFLA_GRE_TTL] = { .type = NLA_U8 }, 2177 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 }, 2178 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 }, 2179 [IFLA_GRE_FLAGS] = { .type = NLA_U32 }, 2180 [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 }, 2181 [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 }, 2182 [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 }, 2183 [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 }, 2184 [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG }, 2185 [IFLA_GRE_FWMARK] = { .type = NLA_U32 }, 2186 [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 }, 2187 [IFLA_GRE_ERSPAN_VER] = { .type = NLA_U8 }, 2188 [IFLA_GRE_ERSPAN_DIR] = { .type = NLA_U8 }, 2189 [IFLA_GRE_ERSPAN_HWID] = { .type = NLA_U16 }, 2190 }; 2191 2192 static void ip6erspan_tap_setup(struct net_device *dev) 2193 { 2194 ether_setup(dev); 2195 2196 dev->netdev_ops = &ip6erspan_netdev_ops; 2197 dev->needs_free_netdev = true; 2198 dev->priv_destructor = ip6gre_dev_free; 2199 2200 dev->features |= NETIF_F_NETNS_LOCAL; 2201 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 2202 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 2203 netif_keep_dst(dev); 2204 } 2205 2206 static int ip6erspan_newlink(struct net *src_net, struct net_device *dev, 2207 struct nlattr *tb[], struct nlattr *data[], 2208 struct netlink_ext_ack *extack) 2209 { 2210 struct ip6_tnl *nt = netdev_priv(dev); 2211 struct net *net = dev_net(dev); 2212 struct ip6gre_net *ign; 2213 int err; 2214 2215 ip6gre_netlink_parms(data, &nt->parms); 2216 ign = net_generic(net, ip6gre_net_id); 2217 2218 if (nt->parms.collect_md) { 2219 if (rtnl_dereference(ign->collect_md_tun_erspan)) 2220 return -EEXIST; 2221 } else { 2222 if (ip6gre_tunnel_find(net, &nt->parms, dev->type)) 2223 return -EEXIST; 2224 } 2225 2226 err = ip6gre_newlink_common(src_net, dev, tb, data, extack); 2227 if (!err) { 2228 ip6erspan_tnl_link_config(nt, !tb[IFLA_MTU]); 2229 ip6erspan_tunnel_link_md(ign, nt); 2230 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt); 2231 } 2232 return err; 2233 } 2234 2235 static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu) 2236 { 2237 ip6gre_tnl_link_config_common(t); 2238 ip6gre_tnl_link_config_route(t, set_mtu, ip6erspan_calc_hlen(t)); 2239 } 2240 2241 static int ip6erspan_tnl_change(struct ip6_tnl *t, 2242 const struct __ip6_tnl_parm *p, int set_mtu) 2243 { 2244 ip6gre_tnl_copy_tnl_parm(t, p); 2245 ip6erspan_tnl_link_config(t, set_mtu); 2246 return 0; 2247 } 2248 2249 static int ip6erspan_changelink(struct net_device *dev, struct nlattr *tb[], 2250 struct nlattr *data[], 2251 struct netlink_ext_ack *extack) 2252 { 2253 struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id); 2254 struct __ip6_tnl_parm p; 2255 struct ip6_tnl *t; 2256 2257 t = ip6gre_changelink_common(dev, tb, data, &p, extack); 2258 if (IS_ERR(t)) 2259 return PTR_ERR(t); 2260 2261 ip6gre_tunnel_unlink_md(ign, t); 2262 ip6gre_tunnel_unlink(ign, t); 2263 ip6erspan_tnl_change(t, &p, !tb[IFLA_MTU]); 2264 ip6erspan_tunnel_link_md(ign, t); 2265 ip6gre_tunnel_link(ign, t); 2266 return 0; 2267 } 2268 2269 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = { 2270 .kind = "ip6gre", 2271 .maxtype = IFLA_GRE_MAX, 2272 .policy = ip6gre_policy, 2273 .priv_size = sizeof(struct ip6_tnl), 2274 .setup = ip6gre_tunnel_setup, 2275 .validate = ip6gre_tunnel_validate, 2276 .newlink = ip6gre_newlink, 2277 .changelink = ip6gre_changelink, 2278 .dellink = ip6gre_dellink, 2279 .get_size = ip6gre_get_size, 2280 .fill_info = ip6gre_fill_info, 2281 .get_link_net = ip6_tnl_get_link_net, 2282 }; 2283 2284 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = { 2285 .kind = "ip6gretap", 2286 .maxtype = IFLA_GRE_MAX, 2287 .policy = ip6gre_policy, 2288 .priv_size = sizeof(struct ip6_tnl), 2289 .setup = ip6gre_tap_setup, 2290 .validate = ip6gre_tap_validate, 2291 .newlink = ip6gre_newlink, 2292 .changelink = ip6gre_changelink, 2293 .get_size = ip6gre_get_size, 2294 .fill_info = ip6gre_fill_info, 2295 .get_link_net = ip6_tnl_get_link_net, 2296 }; 2297 2298 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly = { 2299 .kind = "ip6erspan", 2300 .maxtype = IFLA_GRE_MAX, 2301 .policy = ip6gre_policy, 2302 .priv_size = sizeof(struct ip6_tnl), 2303 .setup = ip6erspan_tap_setup, 2304 .validate = ip6erspan_tap_validate, 2305 .newlink = ip6erspan_newlink, 2306 .changelink = ip6erspan_changelink, 2307 .get_size = ip6gre_get_size, 2308 .fill_info = ip6gre_fill_info, 2309 .get_link_net = ip6_tnl_get_link_net, 2310 }; 2311 2312 /* 2313 * And now the modules code and kernel interface. 2314 */ 2315 2316 static int __init ip6gre_init(void) 2317 { 2318 int err; 2319 2320 pr_info("GRE over IPv6 tunneling driver\n"); 2321 2322 err = register_pernet_device(&ip6gre_net_ops); 2323 if (err < 0) 2324 return err; 2325 2326 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE); 2327 if (err < 0) { 2328 pr_info("%s: can't add protocol\n", __func__); 2329 goto add_proto_failed; 2330 } 2331 2332 err = rtnl_link_register(&ip6gre_link_ops); 2333 if (err < 0) 2334 goto rtnl_link_failed; 2335 2336 err = rtnl_link_register(&ip6gre_tap_ops); 2337 if (err < 0) 2338 goto tap_ops_failed; 2339 2340 err = rtnl_link_register(&ip6erspan_tap_ops); 2341 if (err < 0) 2342 goto erspan_link_failed; 2343 2344 out: 2345 return err; 2346 2347 erspan_link_failed: 2348 rtnl_link_unregister(&ip6gre_tap_ops); 2349 tap_ops_failed: 2350 rtnl_link_unregister(&ip6gre_link_ops); 2351 rtnl_link_failed: 2352 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE); 2353 add_proto_failed: 2354 unregister_pernet_device(&ip6gre_net_ops); 2355 goto out; 2356 } 2357 2358 static void __exit ip6gre_fini(void) 2359 { 2360 rtnl_link_unregister(&ip6gre_tap_ops); 2361 rtnl_link_unregister(&ip6gre_link_ops); 2362 rtnl_link_unregister(&ip6erspan_tap_ops); 2363 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE); 2364 unregister_pernet_device(&ip6gre_net_ops); 2365 } 2366 2367 module_init(ip6gre_init); 2368 module_exit(ip6gre_fini); 2369 MODULE_LICENSE("GPL"); 2370 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)"); 2371 MODULE_DESCRIPTION("GRE over IPv6 tunneling device"); 2372 MODULE_ALIAS_RTNL_LINK("ip6gre"); 2373 MODULE_ALIAS_RTNL_LINK("ip6gretap"); 2374 MODULE_ALIAS_RTNL_LINK("ip6erspan"); 2375 MODULE_ALIAS_NETDEV("ip6gre0"); 2376