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 net_device *fb_tunnel_dev; 75 }; 76 77 static struct rtnl_link_ops ip6gre_link_ops __read_mostly; 78 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly; 79 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly; 80 static int ip6gre_tunnel_init(struct net_device *dev); 81 static void ip6gre_tunnel_setup(struct net_device *dev); 82 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t); 83 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu); 84 85 /* Tunnel hash table */ 86 87 /* 88 4 hash tables: 89 90 3: (remote,local) 91 2: (remote,*) 92 1: (*,local) 93 0: (*,*) 94 95 We require exact key match i.e. if a key is present in packet 96 it will match only tunnel with the same key; if it is not present, 97 it will match only keyless tunnel. 98 99 All keysless packets, if not matched configured keyless tunnels 100 will match fallback tunnel. 101 */ 102 103 #define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(IP6_GRE_HASH_SIZE - 1)) 104 static u32 HASH_ADDR(const struct in6_addr *addr) 105 { 106 u32 hash = ipv6_addr_hash(addr); 107 108 return hash_32(hash, IP6_GRE_HASH_SIZE_SHIFT); 109 } 110 111 #define tunnels_r_l tunnels[3] 112 #define tunnels_r tunnels[2] 113 #define tunnels_l tunnels[1] 114 #define tunnels_wc tunnels[0] 115 116 /* Given src, dst and key, find appropriate for input tunnel. */ 117 118 static struct ip6_tnl *ip6gre_tunnel_lookup(struct net_device *dev, 119 const struct in6_addr *remote, const struct in6_addr *local, 120 __be32 key, __be16 gre_proto) 121 { 122 struct net *net = dev_net(dev); 123 int link = dev->ifindex; 124 unsigned int h0 = HASH_ADDR(remote); 125 unsigned int h1 = HASH_KEY(key); 126 struct ip6_tnl *t, *cand = NULL; 127 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 128 int dev_type = (gre_proto == htons(ETH_P_TEB) || 129 gre_proto == htons(ETH_P_ERSPAN) || 130 gre_proto == htons(ETH_P_ERSPAN2)) ? 131 ARPHRD_ETHER : ARPHRD_IP6GRE; 132 int score, cand_score = 4; 133 134 for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) { 135 if (!ipv6_addr_equal(local, &t->parms.laddr) || 136 !ipv6_addr_equal(remote, &t->parms.raddr) || 137 key != t->parms.i_key || 138 !(t->dev->flags & IFF_UP)) 139 continue; 140 141 if (t->dev->type != ARPHRD_IP6GRE && 142 t->dev->type != dev_type) 143 continue; 144 145 score = 0; 146 if (t->parms.link != link) 147 score |= 1; 148 if (t->dev->type != dev_type) 149 score |= 2; 150 if (score == 0) 151 return t; 152 153 if (score < cand_score) { 154 cand = t; 155 cand_score = score; 156 } 157 } 158 159 for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) { 160 if (!ipv6_addr_equal(remote, &t->parms.raddr) || 161 key != t->parms.i_key || 162 !(t->dev->flags & IFF_UP)) 163 continue; 164 165 if (t->dev->type != ARPHRD_IP6GRE && 166 t->dev->type != dev_type) 167 continue; 168 169 score = 0; 170 if (t->parms.link != link) 171 score |= 1; 172 if (t->dev->type != dev_type) 173 score |= 2; 174 if (score == 0) 175 return t; 176 177 if (score < cand_score) { 178 cand = t; 179 cand_score = score; 180 } 181 } 182 183 for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) { 184 if ((!ipv6_addr_equal(local, &t->parms.laddr) && 185 (!ipv6_addr_equal(local, &t->parms.raddr) || 186 !ipv6_addr_is_multicast(local))) || 187 key != t->parms.i_key || 188 !(t->dev->flags & IFF_UP)) 189 continue; 190 191 if (t->dev->type != ARPHRD_IP6GRE && 192 t->dev->type != dev_type) 193 continue; 194 195 score = 0; 196 if (t->parms.link != link) 197 score |= 1; 198 if (t->dev->type != dev_type) 199 score |= 2; 200 if (score == 0) 201 return t; 202 203 if (score < cand_score) { 204 cand = t; 205 cand_score = score; 206 } 207 } 208 209 for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) { 210 if (t->parms.i_key != key || 211 !(t->dev->flags & IFF_UP)) 212 continue; 213 214 if (t->dev->type != ARPHRD_IP6GRE && 215 t->dev->type != dev_type) 216 continue; 217 218 score = 0; 219 if (t->parms.link != link) 220 score |= 1; 221 if (t->dev->type != dev_type) 222 score |= 2; 223 if (score == 0) 224 return t; 225 226 if (score < cand_score) { 227 cand = t; 228 cand_score = score; 229 } 230 } 231 232 if (cand) 233 return cand; 234 235 t = rcu_dereference(ign->collect_md_tun); 236 if (t && t->dev->flags & IFF_UP) 237 return t; 238 239 dev = ign->fb_tunnel_dev; 240 if (dev && dev->flags & IFF_UP) 241 return netdev_priv(dev); 242 243 return NULL; 244 } 245 246 static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign, 247 const struct __ip6_tnl_parm *p) 248 { 249 const struct in6_addr *remote = &p->raddr; 250 const struct in6_addr *local = &p->laddr; 251 unsigned int h = HASH_KEY(p->i_key); 252 int prio = 0; 253 254 if (!ipv6_addr_any(local)) 255 prio |= 1; 256 if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) { 257 prio |= 2; 258 h ^= HASH_ADDR(remote); 259 } 260 261 return &ign->tunnels[prio][h]; 262 } 263 264 static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign, 265 const struct ip6_tnl *t) 266 { 267 return __ip6gre_bucket(ign, &t->parms); 268 } 269 270 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t) 271 { 272 struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t); 273 274 if (t->parms.collect_md) 275 rcu_assign_pointer(ign->collect_md_tun, t); 276 277 rcu_assign_pointer(t->next, rtnl_dereference(*tp)); 278 rcu_assign_pointer(*tp, t); 279 } 280 281 static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t) 282 { 283 struct ip6_tnl __rcu **tp; 284 struct ip6_tnl *iter; 285 286 if (t->parms.collect_md) 287 rcu_assign_pointer(ign->collect_md_tun, NULL); 288 289 for (tp = ip6gre_bucket(ign, t); 290 (iter = rtnl_dereference(*tp)) != NULL; 291 tp = &iter->next) { 292 if (t == iter) { 293 rcu_assign_pointer(*tp, t->next); 294 break; 295 } 296 } 297 } 298 299 static struct ip6_tnl *ip6gre_tunnel_find(struct net *net, 300 const struct __ip6_tnl_parm *parms, 301 int type) 302 { 303 const struct in6_addr *remote = &parms->raddr; 304 const struct in6_addr *local = &parms->laddr; 305 __be32 key = parms->i_key; 306 int link = parms->link; 307 struct ip6_tnl *t; 308 struct ip6_tnl __rcu **tp; 309 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 310 311 for (tp = __ip6gre_bucket(ign, parms); 312 (t = rtnl_dereference(*tp)) != NULL; 313 tp = &t->next) 314 if (ipv6_addr_equal(local, &t->parms.laddr) && 315 ipv6_addr_equal(remote, &t->parms.raddr) && 316 key == t->parms.i_key && 317 link == t->parms.link && 318 type == t->dev->type) 319 break; 320 321 return t; 322 } 323 324 static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net, 325 const struct __ip6_tnl_parm *parms, int create) 326 { 327 struct ip6_tnl *t, *nt; 328 struct net_device *dev; 329 char name[IFNAMSIZ]; 330 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 331 332 t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE); 333 if (t && create) 334 return NULL; 335 if (t || !create) 336 return t; 337 338 if (parms->name[0]) 339 strlcpy(name, parms->name, IFNAMSIZ); 340 else 341 strcpy(name, "ip6gre%d"); 342 343 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, 344 ip6gre_tunnel_setup); 345 if (!dev) 346 return NULL; 347 348 dev_net_set(dev, net); 349 350 nt = netdev_priv(dev); 351 nt->parms = *parms; 352 dev->rtnl_link_ops = &ip6gre_link_ops; 353 354 nt->dev = dev; 355 nt->net = dev_net(dev); 356 357 if (register_netdevice(dev) < 0) 358 goto failed_free; 359 360 ip6gre_tnl_link_config(nt, 1); 361 362 /* Can use a lockless transmit, unless we generate output sequences */ 363 if (!(nt->parms.o_flags & TUNNEL_SEQ)) 364 dev->features |= NETIF_F_LLTX; 365 366 dev_hold(dev); 367 ip6gre_tunnel_link(ign, nt); 368 return nt; 369 370 failed_free: 371 free_netdev(dev); 372 return NULL; 373 } 374 375 static void ip6gre_tunnel_uninit(struct net_device *dev) 376 { 377 struct ip6_tnl *t = netdev_priv(dev); 378 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id); 379 380 ip6gre_tunnel_unlink(ign, t); 381 dst_cache_reset(&t->dst_cache); 382 dev_put(dev); 383 } 384 385 386 static void ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 387 u8 type, u8 code, int offset, __be32 info) 388 { 389 struct net *net = dev_net(skb->dev); 390 const struct gre_base_hdr *greh; 391 const struct ipv6hdr *ipv6h; 392 int grehlen = sizeof(*greh); 393 struct ip6_tnl *t; 394 int key_off = 0; 395 __be16 flags; 396 __be32 key; 397 398 if (!pskb_may_pull(skb, offset + grehlen)) 399 return; 400 greh = (const struct gre_base_hdr *)(skb->data + offset); 401 flags = greh->flags; 402 if (flags & (GRE_VERSION | GRE_ROUTING)) 403 return; 404 if (flags & GRE_CSUM) 405 grehlen += 4; 406 if (flags & GRE_KEY) { 407 key_off = grehlen + offset; 408 grehlen += 4; 409 } 410 411 if (!pskb_may_pull(skb, offset + grehlen)) 412 return; 413 ipv6h = (const struct ipv6hdr *)skb->data; 414 greh = (const struct gre_base_hdr *)(skb->data + offset); 415 key = key_off ? *(__be32 *)(skb->data + key_off) : 0; 416 417 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr, 418 key, greh->protocol); 419 if (!t) 420 return; 421 422 switch (type) { 423 struct ipv6_tlv_tnl_enc_lim *tel; 424 __u32 teli; 425 case ICMPV6_DEST_UNREACH: 426 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n", 427 t->parms.name); 428 if (code != ICMPV6_PORT_UNREACH) 429 break; 430 return; 431 case ICMPV6_TIME_EXCEED: 432 if (code == ICMPV6_EXC_HOPLIMIT) { 433 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n", 434 t->parms.name); 435 break; 436 } 437 return; 438 case ICMPV6_PARAMPROB: 439 teli = 0; 440 if (code == ICMPV6_HDR_FIELD) 441 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data); 442 443 if (teli && teli == be32_to_cpu(info) - 2) { 444 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli]; 445 if (tel->encap_limit == 0) { 446 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n", 447 t->parms.name); 448 } 449 } else { 450 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n", 451 t->parms.name); 452 } 453 return; 454 case ICMPV6_PKT_TOOBIG: 455 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL)); 456 return; 457 case NDISC_REDIRECT: 458 ip6_redirect(skb, net, skb->dev->ifindex, 0, 459 sock_net_uid(net, NULL)); 460 return; 461 } 462 463 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO)) 464 t->err_count++; 465 else 466 t->err_count = 1; 467 t->err_time = jiffies; 468 } 469 470 static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi) 471 { 472 const struct ipv6hdr *ipv6h; 473 struct ip6_tnl *tunnel; 474 475 ipv6h = ipv6_hdr(skb); 476 tunnel = ip6gre_tunnel_lookup(skb->dev, 477 &ipv6h->saddr, &ipv6h->daddr, tpi->key, 478 tpi->proto); 479 if (tunnel) { 480 if (tunnel->parms.collect_md) { 481 struct metadata_dst *tun_dst; 482 __be64 tun_id; 483 __be16 flags; 484 485 flags = tpi->flags; 486 tun_id = key32_to_tunnel_id(tpi->key); 487 488 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id, 0); 489 if (!tun_dst) 490 return PACKET_REJECT; 491 492 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error); 493 } else { 494 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error); 495 } 496 497 return PACKET_RCVD; 498 } 499 500 return PACKET_REJECT; 501 } 502 503 static int ip6erspan_rcv(struct sk_buff *skb, int gre_hdr_len, 504 struct tnl_ptk_info *tpi) 505 { 506 struct erspan_base_hdr *ershdr; 507 struct erspan_metadata *pkt_md; 508 const struct ipv6hdr *ipv6h; 509 struct erspan_md2 *md2; 510 struct ip6_tnl *tunnel; 511 u8 ver; 512 513 if (unlikely(!pskb_may_pull(skb, sizeof(*ershdr)))) 514 return PACKET_REJECT; 515 516 ipv6h = ipv6_hdr(skb); 517 ershdr = (struct erspan_base_hdr *)skb->data; 518 ver = ershdr->ver; 519 tpi->key = cpu_to_be32(get_session_id(ershdr)); 520 521 tunnel = ip6gre_tunnel_lookup(skb->dev, 522 &ipv6h->saddr, &ipv6h->daddr, tpi->key, 523 tpi->proto); 524 if (tunnel) { 525 int len = erspan_hdr_len(ver); 526 527 if (unlikely(!pskb_may_pull(skb, len))) 528 return PACKET_REJECT; 529 530 ershdr = (struct erspan_base_hdr *)skb->data; 531 pkt_md = (struct erspan_metadata *)(ershdr + 1); 532 533 if (__iptunnel_pull_header(skb, len, 534 htons(ETH_P_TEB), 535 false, false) < 0) 536 return PACKET_REJECT; 537 538 if (tunnel->parms.collect_md) { 539 struct metadata_dst *tun_dst; 540 struct ip_tunnel_info *info; 541 struct erspan_metadata *md; 542 __be64 tun_id; 543 __be16 flags; 544 545 tpi->flags |= TUNNEL_KEY; 546 flags = tpi->flags; 547 tun_id = key32_to_tunnel_id(tpi->key); 548 549 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id, 550 sizeof(*md)); 551 if (!tun_dst) 552 return PACKET_REJECT; 553 554 info = &tun_dst->u.tun_info; 555 md = ip_tunnel_info_opts(info); 556 md->version = ver; 557 md2 = &md->u.md2; 558 memcpy(md2, pkt_md, ver == 1 ? ERSPAN_V1_MDSIZE : 559 ERSPAN_V2_MDSIZE); 560 info->key.tun_flags |= TUNNEL_ERSPAN_OPT; 561 info->options_len = sizeof(*md); 562 563 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error); 564 565 } else { 566 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error); 567 } 568 569 return PACKET_RCVD; 570 } 571 572 return PACKET_REJECT; 573 } 574 575 static int gre_rcv(struct sk_buff *skb) 576 { 577 struct tnl_ptk_info tpi; 578 bool csum_err = false; 579 int hdr_len; 580 581 hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0); 582 if (hdr_len < 0) 583 goto drop; 584 585 if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false)) 586 goto drop; 587 588 if (unlikely(tpi.proto == htons(ETH_P_ERSPAN) || 589 tpi.proto == htons(ETH_P_ERSPAN2))) { 590 if (ip6erspan_rcv(skb, hdr_len, &tpi) == PACKET_RCVD) 591 return 0; 592 goto out; 593 } 594 595 if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD) 596 return 0; 597 598 out: 599 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); 600 drop: 601 kfree_skb(skb); 602 return 0; 603 } 604 605 static int gre_handle_offloads(struct sk_buff *skb, bool csum) 606 { 607 return iptunnel_handle_offloads(skb, 608 csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE); 609 } 610 611 static void prepare_ip6gre_xmit_ipv4(struct sk_buff *skb, 612 struct net_device *dev, 613 struct flowi6 *fl6, __u8 *dsfield, 614 int *encap_limit) 615 { 616 const struct iphdr *iph = ip_hdr(skb); 617 struct ip6_tnl *t = netdev_priv(dev); 618 619 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 620 *encap_limit = t->parms.encap_limit; 621 622 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6)); 623 624 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) 625 *dsfield = ipv4_get_dsfield(iph); 626 else 627 *dsfield = ip6_tclass(t->parms.flowinfo); 628 629 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) 630 fl6->flowi6_mark = skb->mark; 631 else 632 fl6->flowi6_mark = t->parms.fwmark; 633 634 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL); 635 } 636 637 static int prepare_ip6gre_xmit_ipv6(struct sk_buff *skb, 638 struct net_device *dev, 639 struct flowi6 *fl6, __u8 *dsfield, 640 int *encap_limit) 641 { 642 struct ipv6hdr *ipv6h = ipv6_hdr(skb); 643 struct ip6_tnl *t = netdev_priv(dev); 644 __u16 offset; 645 646 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb)); 647 /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */ 648 649 if (offset > 0) { 650 struct ipv6_tlv_tnl_enc_lim *tel; 651 652 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset]; 653 if (tel->encap_limit == 0) { 654 icmpv6_send(skb, ICMPV6_PARAMPROB, 655 ICMPV6_HDR_FIELD, offset + 2); 656 return -1; 657 } 658 *encap_limit = tel->encap_limit - 1; 659 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) { 660 *encap_limit = t->parms.encap_limit; 661 } 662 663 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6)); 664 665 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) 666 *dsfield = ipv6_get_dsfield(ipv6h); 667 else 668 *dsfield = ip6_tclass(t->parms.flowinfo); 669 670 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL) 671 fl6->flowlabel |= ip6_flowlabel(ipv6h); 672 673 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) 674 fl6->flowi6_mark = skb->mark; 675 else 676 fl6->flowi6_mark = t->parms.fwmark; 677 678 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL); 679 680 return 0; 681 } 682 683 static netdev_tx_t __gre6_xmit(struct sk_buff *skb, 684 struct net_device *dev, __u8 dsfield, 685 struct flowi6 *fl6, int encap_limit, 686 __u32 *pmtu, __be16 proto) 687 { 688 struct ip6_tnl *tunnel = netdev_priv(dev); 689 __be16 protocol; 690 691 if (dev->type == ARPHRD_ETHER) 692 IPCB(skb)->flags = 0; 693 694 if (dev->header_ops && dev->type == ARPHRD_IP6GRE) 695 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr; 696 else 697 fl6->daddr = tunnel->parms.raddr; 698 699 /* Push GRE header. */ 700 protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto; 701 702 if (tunnel->parms.collect_md) { 703 struct ip_tunnel_info *tun_info; 704 const struct ip_tunnel_key *key; 705 __be16 flags; 706 707 tun_info = skb_tunnel_info(skb); 708 if (unlikely(!tun_info || 709 !(tun_info->mode & IP_TUNNEL_INFO_TX) || 710 ip_tunnel_info_af(tun_info) != AF_INET6)) 711 return -EINVAL; 712 713 key = &tun_info->key; 714 memset(fl6, 0, sizeof(*fl6)); 715 fl6->flowi6_proto = IPPROTO_GRE; 716 fl6->daddr = key->u.ipv6.dst; 717 fl6->flowlabel = key->label; 718 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL); 719 720 dsfield = key->tos; 721 flags = key->tun_flags & 722 (TUNNEL_CSUM | TUNNEL_KEY | TUNNEL_SEQ); 723 tunnel->tun_hlen = gre_calc_hlen(flags); 724 725 gre_build_header(skb, tunnel->tun_hlen, 726 flags, protocol, 727 tunnel_id_to_key32(tun_info->key.tun_id), 728 (flags & TUNNEL_SEQ) ? htonl(tunnel->o_seqno++) 729 : 0); 730 731 } else { 732 if (tunnel->parms.o_flags & TUNNEL_SEQ) 733 tunnel->o_seqno++; 734 735 gre_build_header(skb, tunnel->tun_hlen, tunnel->parms.o_flags, 736 protocol, tunnel->parms.o_key, 737 htonl(tunnel->o_seqno)); 738 } 739 740 return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu, 741 NEXTHDR_GRE); 742 } 743 744 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev) 745 { 746 struct ip6_tnl *t = netdev_priv(dev); 747 int encap_limit = -1; 748 struct flowi6 fl6; 749 __u8 dsfield = 0; 750 __u32 mtu; 751 int err; 752 753 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); 754 755 if (!t->parms.collect_md) 756 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6, 757 &dsfield, &encap_limit); 758 759 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)); 760 if (err) 761 return -1; 762 763 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, 764 skb->protocol); 765 if (err != 0) { 766 /* XXX: send ICMP error even if DF is not set. */ 767 if (err == -EMSGSIZE) 768 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, 769 htonl(mtu)); 770 return -1; 771 } 772 773 return 0; 774 } 775 776 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev) 777 { 778 struct ip6_tnl *t = netdev_priv(dev); 779 struct ipv6hdr *ipv6h = ipv6_hdr(skb); 780 int encap_limit = -1; 781 struct flowi6 fl6; 782 __u8 dsfield = 0; 783 __u32 mtu; 784 int err; 785 786 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr)) 787 return -1; 788 789 if (!t->parms.collect_md && 790 prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, &dsfield, &encap_limit)) 791 return -1; 792 793 if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM))) 794 return -1; 795 796 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, 797 &mtu, skb->protocol); 798 if (err != 0) { 799 if (err == -EMSGSIZE) 800 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 801 return -1; 802 } 803 804 return 0; 805 } 806 807 /** 808 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own 809 * @t: the outgoing tunnel device 810 * @hdr: IPv6 header from the incoming packet 811 * 812 * Description: 813 * Avoid trivial tunneling loop by checking that tunnel exit-point 814 * doesn't match source of incoming packet. 815 * 816 * Return: 817 * 1 if conflict, 818 * 0 else 819 **/ 820 821 static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t, 822 const struct ipv6hdr *hdr) 823 { 824 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); 825 } 826 827 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev) 828 { 829 struct ip6_tnl *t = netdev_priv(dev); 830 int encap_limit = -1; 831 struct flowi6 fl6; 832 __u32 mtu; 833 int err; 834 835 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 836 encap_limit = t->parms.encap_limit; 837 838 if (!t->parms.collect_md) 839 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); 840 841 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)); 842 if (err) 843 return err; 844 845 err = __gre6_xmit(skb, dev, 0, &fl6, encap_limit, &mtu, skb->protocol); 846 847 return err; 848 } 849 850 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb, 851 struct net_device *dev) 852 { 853 struct ip6_tnl *t = netdev_priv(dev); 854 struct net_device_stats *stats = &t->dev->stats; 855 int ret; 856 857 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr)) 858 goto tx_err; 859 860 switch (skb->protocol) { 861 case htons(ETH_P_IP): 862 ret = ip6gre_xmit_ipv4(skb, dev); 863 break; 864 case htons(ETH_P_IPV6): 865 ret = ip6gre_xmit_ipv6(skb, dev); 866 break; 867 default: 868 ret = ip6gre_xmit_other(skb, dev); 869 break; 870 } 871 872 if (ret < 0) 873 goto tx_err; 874 875 return NETDEV_TX_OK; 876 877 tx_err: 878 stats->tx_errors++; 879 stats->tx_dropped++; 880 kfree_skb(skb); 881 return NETDEV_TX_OK; 882 } 883 884 static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb, 885 struct net_device *dev) 886 { 887 struct ipv6hdr *ipv6h = ipv6_hdr(skb); 888 struct ip6_tnl *t = netdev_priv(dev); 889 struct dst_entry *dst = skb_dst(skb); 890 struct net_device_stats *stats; 891 bool truncate = false; 892 int encap_limit = -1; 893 __u8 dsfield = false; 894 struct flowi6 fl6; 895 int err = -EINVAL; 896 __u32 mtu; 897 898 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr)) 899 goto tx_err; 900 901 if (gre_handle_offloads(skb, false)) 902 goto tx_err; 903 904 if (skb->len > dev->mtu + dev->hard_header_len) { 905 pskb_trim(skb, dev->mtu + dev->hard_header_len); 906 truncate = true; 907 } 908 909 if (skb_cow_head(skb, dev->needed_headroom)) 910 goto tx_err; 911 912 t->parms.o_flags &= ~TUNNEL_KEY; 913 IPCB(skb)->flags = 0; 914 915 /* For collect_md mode, derive fl6 from the tunnel key, 916 * for native mode, call prepare_ip6gre_xmit_{ipv4,ipv6}. 917 */ 918 if (t->parms.collect_md) { 919 struct ip_tunnel_info *tun_info; 920 const struct ip_tunnel_key *key; 921 struct erspan_metadata *md; 922 __be32 tun_id; 923 924 tun_info = skb_tunnel_info(skb); 925 if (unlikely(!tun_info || 926 !(tun_info->mode & IP_TUNNEL_INFO_TX) || 927 ip_tunnel_info_af(tun_info) != AF_INET6)) 928 return -EINVAL; 929 930 key = &tun_info->key; 931 memset(&fl6, 0, sizeof(fl6)); 932 fl6.flowi6_proto = IPPROTO_GRE; 933 fl6.daddr = key->u.ipv6.dst; 934 fl6.flowlabel = key->label; 935 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL); 936 937 dsfield = key->tos; 938 md = ip_tunnel_info_opts(tun_info); 939 if (!md) 940 goto tx_err; 941 942 tun_id = tunnel_id_to_key32(key->tun_id); 943 if (md->version == 1) { 944 erspan_build_header(skb, 945 ntohl(tun_id), 946 ntohl(md->u.index), truncate, 947 false); 948 } else if (md->version == 2) { 949 erspan_build_header_v2(skb, 950 ntohl(tun_id), 951 md->u.md2.dir, 952 get_hwid(&md->u.md2), 953 truncate, false); 954 } else { 955 goto tx_err; 956 } 957 } else { 958 switch (skb->protocol) { 959 case htons(ETH_P_IP): 960 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); 961 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6, 962 &dsfield, &encap_limit); 963 break; 964 case htons(ETH_P_IPV6): 965 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr)) 966 goto tx_err; 967 if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, 968 &dsfield, &encap_limit)) 969 goto tx_err; 970 break; 971 default: 972 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); 973 break; 974 } 975 976 if (t->parms.erspan_ver == 1) 977 erspan_build_header(skb, ntohl(t->parms.o_key), 978 t->parms.index, 979 truncate, false); 980 else 981 erspan_build_header_v2(skb, ntohl(t->parms.o_key), 982 t->parms.dir, 983 t->parms.hwid, 984 truncate, false); 985 fl6.daddr = t->parms.raddr; 986 } 987 988 /* Push GRE header. */ 989 gre_build_header(skb, 8, TUNNEL_SEQ, 990 htons(ETH_P_ERSPAN), 0, htonl(t->o_seqno++)); 991 992 /* TooBig packet may have updated dst->dev's mtu */ 993 if (!t->parms.collect_md && dst && dst_mtu(dst) > dst->dev->mtu) 994 dst->ops->update_pmtu(dst, NULL, skb, dst->dev->mtu); 995 996 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, 997 NEXTHDR_GRE); 998 if (err != 0) { 999 /* XXX: send ICMP error even if DF is not set. */ 1000 if (err == -EMSGSIZE) { 1001 if (skb->protocol == htons(ETH_P_IP)) 1002 icmp_send(skb, ICMP_DEST_UNREACH, 1003 ICMP_FRAG_NEEDED, htonl(mtu)); 1004 else 1005 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 1006 } 1007 1008 goto tx_err; 1009 } 1010 return NETDEV_TX_OK; 1011 1012 tx_err: 1013 stats = &t->dev->stats; 1014 stats->tx_errors++; 1015 stats->tx_dropped++; 1016 kfree_skb(skb); 1017 return NETDEV_TX_OK; 1018 } 1019 1020 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu) 1021 { 1022 struct net_device *dev = t->dev; 1023 struct __ip6_tnl_parm *p = &t->parms; 1024 struct flowi6 *fl6 = &t->fl.u.ip6; 1025 int t_hlen; 1026 1027 if (dev->type != ARPHRD_ETHER) { 1028 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); 1029 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); 1030 } 1031 1032 /* Set up flowi template */ 1033 fl6->saddr = p->laddr; 1034 fl6->daddr = p->raddr; 1035 fl6->flowi6_oif = p->link; 1036 fl6->flowlabel = 0; 1037 fl6->flowi6_proto = IPPROTO_GRE; 1038 1039 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) 1040 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; 1041 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) 1042 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; 1043 1044 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET); 1045 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr); 1046 1047 if (p->flags&IP6_TNL_F_CAP_XMIT && 1048 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER) 1049 dev->flags |= IFF_POINTOPOINT; 1050 else 1051 dev->flags &= ~IFF_POINTOPOINT; 1052 1053 t->tun_hlen = gre_calc_hlen(t->parms.o_flags); 1054 1055 t->hlen = t->encap_hlen + t->tun_hlen; 1056 1057 t_hlen = t->hlen + sizeof(struct ipv6hdr); 1058 1059 if (p->flags & IP6_TNL_F_CAP_XMIT) { 1060 int strict = (ipv6_addr_type(&p->raddr) & 1061 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); 1062 1063 struct rt6_info *rt = rt6_lookup(t->net, 1064 &p->raddr, &p->laddr, 1065 p->link, NULL, strict); 1066 1067 if (!rt) 1068 return; 1069 1070 if (rt->dst.dev) { 1071 dev->hard_header_len = rt->dst.dev->hard_header_len + 1072 t_hlen; 1073 1074 if (set_mtu) { 1075 dev->mtu = rt->dst.dev->mtu - t_hlen; 1076 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1077 dev->mtu -= 8; 1078 if (dev->type == ARPHRD_ETHER) 1079 dev->mtu -= ETH_HLEN; 1080 1081 if (dev->mtu < IPV6_MIN_MTU) 1082 dev->mtu = IPV6_MIN_MTU; 1083 } 1084 } 1085 ip6_rt_put(rt); 1086 } 1087 } 1088 1089 static int ip6gre_tnl_change(struct ip6_tnl *t, 1090 const struct __ip6_tnl_parm *p, int set_mtu) 1091 { 1092 t->parms.laddr = p->laddr; 1093 t->parms.raddr = p->raddr; 1094 t->parms.flags = p->flags; 1095 t->parms.hop_limit = p->hop_limit; 1096 t->parms.encap_limit = p->encap_limit; 1097 t->parms.flowinfo = p->flowinfo; 1098 t->parms.link = p->link; 1099 t->parms.proto = p->proto; 1100 t->parms.i_key = p->i_key; 1101 t->parms.o_key = p->o_key; 1102 t->parms.i_flags = p->i_flags; 1103 t->parms.o_flags = p->o_flags; 1104 t->parms.fwmark = p->fwmark; 1105 dst_cache_reset(&t->dst_cache); 1106 ip6gre_tnl_link_config(t, set_mtu); 1107 return 0; 1108 } 1109 1110 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p, 1111 const struct ip6_tnl_parm2 *u) 1112 { 1113 p->laddr = u->laddr; 1114 p->raddr = u->raddr; 1115 p->flags = u->flags; 1116 p->hop_limit = u->hop_limit; 1117 p->encap_limit = u->encap_limit; 1118 p->flowinfo = u->flowinfo; 1119 p->link = u->link; 1120 p->i_key = u->i_key; 1121 p->o_key = u->o_key; 1122 p->i_flags = gre_flags_to_tnl_flags(u->i_flags); 1123 p->o_flags = gre_flags_to_tnl_flags(u->o_flags); 1124 memcpy(p->name, u->name, sizeof(u->name)); 1125 } 1126 1127 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u, 1128 const struct __ip6_tnl_parm *p) 1129 { 1130 u->proto = IPPROTO_GRE; 1131 u->laddr = p->laddr; 1132 u->raddr = p->raddr; 1133 u->flags = p->flags; 1134 u->hop_limit = p->hop_limit; 1135 u->encap_limit = p->encap_limit; 1136 u->flowinfo = p->flowinfo; 1137 u->link = p->link; 1138 u->i_key = p->i_key; 1139 u->o_key = p->o_key; 1140 u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags); 1141 u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags); 1142 memcpy(u->name, p->name, sizeof(u->name)); 1143 } 1144 1145 static int ip6gre_tunnel_ioctl(struct net_device *dev, 1146 struct ifreq *ifr, int cmd) 1147 { 1148 int err = 0; 1149 struct ip6_tnl_parm2 p; 1150 struct __ip6_tnl_parm p1; 1151 struct ip6_tnl *t = netdev_priv(dev); 1152 struct net *net = t->net; 1153 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1154 1155 memset(&p1, 0, sizeof(p1)); 1156 1157 switch (cmd) { 1158 case SIOCGETTUNNEL: 1159 if (dev == ign->fb_tunnel_dev) { 1160 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { 1161 err = -EFAULT; 1162 break; 1163 } 1164 ip6gre_tnl_parm_from_user(&p1, &p); 1165 t = ip6gre_tunnel_locate(net, &p1, 0); 1166 if (!t) 1167 t = netdev_priv(dev); 1168 } 1169 memset(&p, 0, sizeof(p)); 1170 ip6gre_tnl_parm_to_user(&p, &t->parms); 1171 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) 1172 err = -EFAULT; 1173 break; 1174 1175 case SIOCADDTUNNEL: 1176 case SIOCCHGTUNNEL: 1177 err = -EPERM; 1178 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1179 goto done; 1180 1181 err = -EFAULT; 1182 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 1183 goto done; 1184 1185 err = -EINVAL; 1186 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING)) 1187 goto done; 1188 1189 if (!(p.i_flags&GRE_KEY)) 1190 p.i_key = 0; 1191 if (!(p.o_flags&GRE_KEY)) 1192 p.o_key = 0; 1193 1194 ip6gre_tnl_parm_from_user(&p1, &p); 1195 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL); 1196 1197 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { 1198 if (t) { 1199 if (t->dev != dev) { 1200 err = -EEXIST; 1201 break; 1202 } 1203 } else { 1204 t = netdev_priv(dev); 1205 1206 ip6gre_tunnel_unlink(ign, t); 1207 synchronize_net(); 1208 ip6gre_tnl_change(t, &p1, 1); 1209 ip6gre_tunnel_link(ign, t); 1210 netdev_state_change(dev); 1211 } 1212 } 1213 1214 if (t) { 1215 err = 0; 1216 1217 memset(&p, 0, sizeof(p)); 1218 ip6gre_tnl_parm_to_user(&p, &t->parms); 1219 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) 1220 err = -EFAULT; 1221 } else 1222 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); 1223 break; 1224 1225 case SIOCDELTUNNEL: 1226 err = -EPERM; 1227 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1228 goto done; 1229 1230 if (dev == ign->fb_tunnel_dev) { 1231 err = -EFAULT; 1232 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 1233 goto done; 1234 err = -ENOENT; 1235 ip6gre_tnl_parm_from_user(&p1, &p); 1236 t = ip6gre_tunnel_locate(net, &p1, 0); 1237 if (!t) 1238 goto done; 1239 err = -EPERM; 1240 if (t == netdev_priv(ign->fb_tunnel_dev)) 1241 goto done; 1242 dev = t->dev; 1243 } 1244 unregister_netdevice(dev); 1245 err = 0; 1246 break; 1247 1248 default: 1249 err = -EINVAL; 1250 } 1251 1252 done: 1253 return err; 1254 } 1255 1256 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev, 1257 unsigned short type, const void *daddr, 1258 const void *saddr, unsigned int len) 1259 { 1260 struct ip6_tnl *t = netdev_priv(dev); 1261 struct ipv6hdr *ipv6h; 1262 __be16 *p; 1263 1264 ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h)); 1265 ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb, 1266 t->fl.u.ip6.flowlabel, 1267 true, &t->fl.u.ip6)); 1268 ipv6h->hop_limit = t->parms.hop_limit; 1269 ipv6h->nexthdr = NEXTHDR_GRE; 1270 ipv6h->saddr = t->parms.laddr; 1271 ipv6h->daddr = t->parms.raddr; 1272 1273 p = (__be16 *)(ipv6h + 1); 1274 p[0] = t->parms.o_flags; 1275 p[1] = htons(type); 1276 1277 /* 1278 * Set the source hardware address. 1279 */ 1280 1281 if (saddr) 1282 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr)); 1283 if (daddr) 1284 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr)); 1285 if (!ipv6_addr_any(&ipv6h->daddr)) 1286 return t->hlen; 1287 1288 return -t->hlen; 1289 } 1290 1291 static const struct header_ops ip6gre_header_ops = { 1292 .create = ip6gre_header, 1293 }; 1294 1295 static const struct net_device_ops ip6gre_netdev_ops = { 1296 .ndo_init = ip6gre_tunnel_init, 1297 .ndo_uninit = ip6gre_tunnel_uninit, 1298 .ndo_start_xmit = ip6gre_tunnel_xmit, 1299 .ndo_do_ioctl = ip6gre_tunnel_ioctl, 1300 .ndo_change_mtu = ip6_tnl_change_mtu, 1301 .ndo_get_stats64 = ip_tunnel_get_stats64, 1302 .ndo_get_iflink = ip6_tnl_get_iflink, 1303 }; 1304 1305 static void ip6gre_dev_free(struct net_device *dev) 1306 { 1307 struct ip6_tnl *t = netdev_priv(dev); 1308 1309 dst_cache_destroy(&t->dst_cache); 1310 free_percpu(dev->tstats); 1311 } 1312 1313 static void ip6gre_tunnel_setup(struct net_device *dev) 1314 { 1315 dev->netdev_ops = &ip6gre_netdev_ops; 1316 dev->needs_free_netdev = true; 1317 dev->priv_destructor = ip6gre_dev_free; 1318 1319 dev->type = ARPHRD_IP6GRE; 1320 1321 dev->flags |= IFF_NOARP; 1322 dev->addr_len = sizeof(struct in6_addr); 1323 netif_keep_dst(dev); 1324 /* This perm addr will be used as interface identifier by IPv6 */ 1325 dev->addr_assign_type = NET_ADDR_RANDOM; 1326 eth_random_addr(dev->perm_addr); 1327 } 1328 1329 #define GRE6_FEATURES (NETIF_F_SG | \ 1330 NETIF_F_FRAGLIST | \ 1331 NETIF_F_HIGHDMA | \ 1332 NETIF_F_HW_CSUM) 1333 1334 static void ip6gre_tnl_init_features(struct net_device *dev) 1335 { 1336 struct ip6_tnl *nt = netdev_priv(dev); 1337 1338 dev->features |= GRE6_FEATURES; 1339 dev->hw_features |= GRE6_FEATURES; 1340 1341 if (!(nt->parms.o_flags & TUNNEL_SEQ)) { 1342 /* TCP offload with GRE SEQ is not supported, nor 1343 * can we support 2 levels of outer headers requiring 1344 * an update. 1345 */ 1346 if (!(nt->parms.o_flags & TUNNEL_CSUM) || 1347 nt->encap.type == TUNNEL_ENCAP_NONE) { 1348 dev->features |= NETIF_F_GSO_SOFTWARE; 1349 dev->hw_features |= NETIF_F_GSO_SOFTWARE; 1350 } 1351 1352 /* Can use a lockless transmit, unless we generate 1353 * output sequences 1354 */ 1355 dev->features |= NETIF_F_LLTX; 1356 } 1357 } 1358 1359 static int ip6gre_tunnel_init_common(struct net_device *dev) 1360 { 1361 struct ip6_tnl *tunnel; 1362 int ret; 1363 int t_hlen; 1364 1365 tunnel = netdev_priv(dev); 1366 1367 tunnel->dev = dev; 1368 tunnel->net = dev_net(dev); 1369 strcpy(tunnel->parms.name, dev->name); 1370 1371 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 1372 if (!dev->tstats) 1373 return -ENOMEM; 1374 1375 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); 1376 if (ret) { 1377 free_percpu(dev->tstats); 1378 dev->tstats = NULL; 1379 return ret; 1380 } 1381 1382 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags); 1383 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen; 1384 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr); 1385 1386 dev->hard_header_len = LL_MAX_HEADER + t_hlen; 1387 dev->mtu = ETH_DATA_LEN - t_hlen; 1388 if (dev->type == ARPHRD_ETHER) 1389 dev->mtu -= ETH_HLEN; 1390 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1391 dev->mtu -= 8; 1392 1393 if (tunnel->parms.collect_md) { 1394 dev->features |= NETIF_F_NETNS_LOCAL; 1395 netif_keep_dst(dev); 1396 } 1397 ip6gre_tnl_init_features(dev); 1398 1399 return 0; 1400 } 1401 1402 static int ip6gre_tunnel_init(struct net_device *dev) 1403 { 1404 struct ip6_tnl *tunnel; 1405 int ret; 1406 1407 ret = ip6gre_tunnel_init_common(dev); 1408 if (ret) 1409 return ret; 1410 1411 tunnel = netdev_priv(dev); 1412 1413 if (tunnel->parms.collect_md) 1414 return 0; 1415 1416 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr)); 1417 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr)); 1418 1419 if (ipv6_addr_any(&tunnel->parms.raddr)) 1420 dev->header_ops = &ip6gre_header_ops; 1421 1422 return 0; 1423 } 1424 1425 static void ip6gre_fb_tunnel_init(struct net_device *dev) 1426 { 1427 struct ip6_tnl *tunnel = netdev_priv(dev); 1428 1429 tunnel->dev = dev; 1430 tunnel->net = dev_net(dev); 1431 strcpy(tunnel->parms.name, dev->name); 1432 1433 tunnel->hlen = sizeof(struct ipv6hdr) + 4; 1434 1435 dev_hold(dev); 1436 } 1437 1438 static struct inet6_protocol ip6gre_protocol __read_mostly = { 1439 .handler = gre_rcv, 1440 .err_handler = ip6gre_err, 1441 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 1442 }; 1443 1444 static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head) 1445 { 1446 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1447 struct net_device *dev, *aux; 1448 int prio; 1449 1450 for_each_netdev_safe(net, dev, aux) 1451 if (dev->rtnl_link_ops == &ip6gre_link_ops || 1452 dev->rtnl_link_ops == &ip6gre_tap_ops || 1453 dev->rtnl_link_ops == &ip6erspan_tap_ops) 1454 unregister_netdevice_queue(dev, head); 1455 1456 for (prio = 0; prio < 4; prio++) { 1457 int h; 1458 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) { 1459 struct ip6_tnl *t; 1460 1461 t = rtnl_dereference(ign->tunnels[prio][h]); 1462 1463 while (t) { 1464 /* If dev is in the same netns, it has already 1465 * been added to the list by the previous loop. 1466 */ 1467 if (!net_eq(dev_net(t->dev), net)) 1468 unregister_netdevice_queue(t->dev, 1469 head); 1470 t = rtnl_dereference(t->next); 1471 } 1472 } 1473 } 1474 } 1475 1476 static int __net_init ip6gre_init_net(struct net *net) 1477 { 1478 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1479 int err; 1480 1481 if (!net_has_fallback_tunnels(net)) 1482 return 0; 1483 ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0", 1484 NET_NAME_UNKNOWN, 1485 ip6gre_tunnel_setup); 1486 if (!ign->fb_tunnel_dev) { 1487 err = -ENOMEM; 1488 goto err_alloc_dev; 1489 } 1490 dev_net_set(ign->fb_tunnel_dev, net); 1491 /* FB netdevice is special: we have one, and only one per netns. 1492 * Allowing to move it to another netns is clearly unsafe. 1493 */ 1494 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL; 1495 1496 1497 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev); 1498 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops; 1499 1500 err = register_netdev(ign->fb_tunnel_dev); 1501 if (err) 1502 goto err_reg_dev; 1503 1504 rcu_assign_pointer(ign->tunnels_wc[0], 1505 netdev_priv(ign->fb_tunnel_dev)); 1506 return 0; 1507 1508 err_reg_dev: 1509 free_netdev(ign->fb_tunnel_dev); 1510 err_alloc_dev: 1511 return err; 1512 } 1513 1514 static void __net_exit ip6gre_exit_batch_net(struct list_head *net_list) 1515 { 1516 struct net *net; 1517 LIST_HEAD(list); 1518 1519 rtnl_lock(); 1520 list_for_each_entry(net, net_list, exit_list) 1521 ip6gre_destroy_tunnels(net, &list); 1522 unregister_netdevice_many(&list); 1523 rtnl_unlock(); 1524 } 1525 1526 static struct pernet_operations ip6gre_net_ops = { 1527 .init = ip6gre_init_net, 1528 .exit_batch = ip6gre_exit_batch_net, 1529 .id = &ip6gre_net_id, 1530 .size = sizeof(struct ip6gre_net), 1531 }; 1532 1533 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[], 1534 struct netlink_ext_ack *extack) 1535 { 1536 __be16 flags; 1537 1538 if (!data) 1539 return 0; 1540 1541 flags = 0; 1542 if (data[IFLA_GRE_IFLAGS]) 1543 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); 1544 if (data[IFLA_GRE_OFLAGS]) 1545 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); 1546 if (flags & (GRE_VERSION|GRE_ROUTING)) 1547 return -EINVAL; 1548 1549 return 0; 1550 } 1551 1552 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[], 1553 struct netlink_ext_ack *extack) 1554 { 1555 struct in6_addr daddr; 1556 1557 if (tb[IFLA_ADDRESS]) { 1558 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 1559 return -EINVAL; 1560 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 1561 return -EADDRNOTAVAIL; 1562 } 1563 1564 if (!data) 1565 goto out; 1566 1567 if (data[IFLA_GRE_REMOTE]) { 1568 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]); 1569 if (ipv6_addr_any(&daddr)) 1570 return -EINVAL; 1571 } 1572 1573 out: 1574 return ip6gre_tunnel_validate(tb, data, extack); 1575 } 1576 1577 static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[], 1578 struct netlink_ext_ack *extack) 1579 { 1580 __be16 flags = 0; 1581 int ret, ver = 0; 1582 1583 if (!data) 1584 return 0; 1585 1586 ret = ip6gre_tap_validate(tb, data, extack); 1587 if (ret) 1588 return ret; 1589 1590 /* ERSPAN should only have GRE sequence and key flag */ 1591 if (data[IFLA_GRE_OFLAGS]) 1592 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); 1593 if (data[IFLA_GRE_IFLAGS]) 1594 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); 1595 if (!data[IFLA_GRE_COLLECT_METADATA] && 1596 flags != (GRE_SEQ | GRE_KEY)) 1597 return -EINVAL; 1598 1599 /* ERSPAN Session ID only has 10-bit. Since we reuse 1600 * 32-bit key field as ID, check it's range. 1601 */ 1602 if (data[IFLA_GRE_IKEY] && 1603 (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK)) 1604 return -EINVAL; 1605 1606 if (data[IFLA_GRE_OKEY] && 1607 (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK)) 1608 return -EINVAL; 1609 1610 if (data[IFLA_GRE_ERSPAN_VER]) { 1611 ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]); 1612 if (ver != 1 && ver != 2) 1613 return -EINVAL; 1614 } 1615 1616 if (ver == 1) { 1617 if (data[IFLA_GRE_ERSPAN_INDEX]) { 1618 u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]); 1619 1620 if (index & ~INDEX_MASK) 1621 return -EINVAL; 1622 } 1623 } else if (ver == 2) { 1624 if (data[IFLA_GRE_ERSPAN_DIR]) { 1625 u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]); 1626 1627 if (dir & ~(DIR_MASK >> DIR_OFFSET)) 1628 return -EINVAL; 1629 } 1630 1631 if (data[IFLA_GRE_ERSPAN_HWID]) { 1632 u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]); 1633 1634 if (hwid & ~(HWID_MASK >> HWID_OFFSET)) 1635 return -EINVAL; 1636 } 1637 } 1638 1639 return 0; 1640 } 1641 1642 static void ip6gre_netlink_parms(struct nlattr *data[], 1643 struct __ip6_tnl_parm *parms) 1644 { 1645 memset(parms, 0, sizeof(*parms)); 1646 1647 if (!data) 1648 return; 1649 1650 if (data[IFLA_GRE_LINK]) 1651 parms->link = nla_get_u32(data[IFLA_GRE_LINK]); 1652 1653 if (data[IFLA_GRE_IFLAGS]) 1654 parms->i_flags = gre_flags_to_tnl_flags( 1655 nla_get_be16(data[IFLA_GRE_IFLAGS])); 1656 1657 if (data[IFLA_GRE_OFLAGS]) 1658 parms->o_flags = gre_flags_to_tnl_flags( 1659 nla_get_be16(data[IFLA_GRE_OFLAGS])); 1660 1661 if (data[IFLA_GRE_IKEY]) 1662 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]); 1663 1664 if (data[IFLA_GRE_OKEY]) 1665 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]); 1666 1667 if (data[IFLA_GRE_LOCAL]) 1668 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]); 1669 1670 if (data[IFLA_GRE_REMOTE]) 1671 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]); 1672 1673 if (data[IFLA_GRE_TTL]) 1674 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]); 1675 1676 if (data[IFLA_GRE_ENCAP_LIMIT]) 1677 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]); 1678 1679 if (data[IFLA_GRE_FLOWINFO]) 1680 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]); 1681 1682 if (data[IFLA_GRE_FLAGS]) 1683 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]); 1684 1685 if (data[IFLA_GRE_FWMARK]) 1686 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]); 1687 1688 if (data[IFLA_GRE_COLLECT_METADATA]) 1689 parms->collect_md = true; 1690 1691 if (data[IFLA_GRE_ERSPAN_VER]) 1692 parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]); 1693 1694 if (parms->erspan_ver == 1) { 1695 if (data[IFLA_GRE_ERSPAN_INDEX]) 1696 parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]); 1697 } else if (parms->erspan_ver == 2) { 1698 if (data[IFLA_GRE_ERSPAN_DIR]) 1699 parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]); 1700 if (data[IFLA_GRE_ERSPAN_HWID]) 1701 parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]); 1702 } 1703 } 1704 1705 static int ip6gre_tap_init(struct net_device *dev) 1706 { 1707 int ret; 1708 1709 ret = ip6gre_tunnel_init_common(dev); 1710 if (ret) 1711 return ret; 1712 1713 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 1714 1715 return 0; 1716 } 1717 1718 static const struct net_device_ops ip6gre_tap_netdev_ops = { 1719 .ndo_init = ip6gre_tap_init, 1720 .ndo_uninit = ip6gre_tunnel_uninit, 1721 .ndo_start_xmit = ip6gre_tunnel_xmit, 1722 .ndo_set_mac_address = eth_mac_addr, 1723 .ndo_validate_addr = eth_validate_addr, 1724 .ndo_change_mtu = ip6_tnl_change_mtu, 1725 .ndo_get_stats64 = ip_tunnel_get_stats64, 1726 .ndo_get_iflink = ip6_tnl_get_iflink, 1727 }; 1728 1729 static int ip6erspan_tap_init(struct net_device *dev) 1730 { 1731 struct ip6_tnl *tunnel; 1732 int t_hlen; 1733 int ret; 1734 1735 tunnel = netdev_priv(dev); 1736 1737 tunnel->dev = dev; 1738 tunnel->net = dev_net(dev); 1739 strcpy(tunnel->parms.name, dev->name); 1740 1741 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 1742 if (!dev->tstats) 1743 return -ENOMEM; 1744 1745 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); 1746 if (ret) { 1747 free_percpu(dev->tstats); 1748 dev->tstats = NULL; 1749 return ret; 1750 } 1751 1752 tunnel->tun_hlen = 8; 1753 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen + 1754 erspan_hdr_len(tunnel->parms.erspan_ver); 1755 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr); 1756 1757 dev->hard_header_len = LL_MAX_HEADER + t_hlen; 1758 dev->mtu = ETH_DATA_LEN - t_hlen; 1759 if (dev->type == ARPHRD_ETHER) 1760 dev->mtu -= ETH_HLEN; 1761 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1762 dev->mtu -= 8; 1763 1764 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 1765 ip6gre_tnl_link_config(tunnel, 1); 1766 1767 return 0; 1768 } 1769 1770 static const struct net_device_ops ip6erspan_netdev_ops = { 1771 .ndo_init = ip6erspan_tap_init, 1772 .ndo_uninit = ip6gre_tunnel_uninit, 1773 .ndo_start_xmit = ip6erspan_tunnel_xmit, 1774 .ndo_set_mac_address = eth_mac_addr, 1775 .ndo_validate_addr = eth_validate_addr, 1776 .ndo_change_mtu = ip6_tnl_change_mtu, 1777 .ndo_get_stats64 = ip_tunnel_get_stats64, 1778 .ndo_get_iflink = ip6_tnl_get_iflink, 1779 }; 1780 1781 static void ip6gre_tap_setup(struct net_device *dev) 1782 { 1783 1784 ether_setup(dev); 1785 1786 dev->max_mtu = 0; 1787 dev->netdev_ops = &ip6gre_tap_netdev_ops; 1788 dev->needs_free_netdev = true; 1789 dev->priv_destructor = ip6gre_dev_free; 1790 1791 dev->features |= NETIF_F_NETNS_LOCAL; 1792 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1793 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 1794 netif_keep_dst(dev); 1795 } 1796 1797 bool is_ip6gretap_dev(const struct net_device *dev) 1798 { 1799 return dev->netdev_ops == &ip6gre_tap_netdev_ops; 1800 } 1801 EXPORT_SYMBOL_GPL(is_ip6gretap_dev); 1802 1803 static bool ip6gre_netlink_encap_parms(struct nlattr *data[], 1804 struct ip_tunnel_encap *ipencap) 1805 { 1806 bool ret = false; 1807 1808 memset(ipencap, 0, sizeof(*ipencap)); 1809 1810 if (!data) 1811 return ret; 1812 1813 if (data[IFLA_GRE_ENCAP_TYPE]) { 1814 ret = true; 1815 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]); 1816 } 1817 1818 if (data[IFLA_GRE_ENCAP_FLAGS]) { 1819 ret = true; 1820 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]); 1821 } 1822 1823 if (data[IFLA_GRE_ENCAP_SPORT]) { 1824 ret = true; 1825 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]); 1826 } 1827 1828 if (data[IFLA_GRE_ENCAP_DPORT]) { 1829 ret = true; 1830 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]); 1831 } 1832 1833 return ret; 1834 } 1835 1836 static int ip6gre_newlink(struct net *src_net, struct net_device *dev, 1837 struct nlattr *tb[], struct nlattr *data[], 1838 struct netlink_ext_ack *extack) 1839 { 1840 struct ip6_tnl *nt; 1841 struct net *net = dev_net(dev); 1842 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1843 struct ip_tunnel_encap ipencap; 1844 int err; 1845 1846 nt = netdev_priv(dev); 1847 1848 if (ip6gre_netlink_encap_parms(data, &ipencap)) { 1849 int err = ip6_tnl_encap_setup(nt, &ipencap); 1850 1851 if (err < 0) 1852 return err; 1853 } 1854 1855 ip6gre_netlink_parms(data, &nt->parms); 1856 1857 if (nt->parms.collect_md) { 1858 if (rtnl_dereference(ign->collect_md_tun)) 1859 return -EEXIST; 1860 } else { 1861 if (ip6gre_tunnel_find(net, &nt->parms, dev->type)) 1862 return -EEXIST; 1863 } 1864 1865 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS]) 1866 eth_hw_addr_random(dev); 1867 1868 nt->dev = dev; 1869 nt->net = dev_net(dev); 1870 1871 err = register_netdevice(dev); 1872 if (err) 1873 goto out; 1874 1875 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]); 1876 1877 if (tb[IFLA_MTU]) 1878 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 1879 1880 dev_hold(dev); 1881 ip6gre_tunnel_link(ign, nt); 1882 1883 out: 1884 return err; 1885 } 1886 1887 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[], 1888 struct nlattr *data[], 1889 struct netlink_ext_ack *extack) 1890 { 1891 struct ip6_tnl *t, *nt = netdev_priv(dev); 1892 struct net *net = nt->net; 1893 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1894 struct __ip6_tnl_parm p; 1895 struct ip_tunnel_encap ipencap; 1896 1897 if (dev == ign->fb_tunnel_dev) 1898 return -EINVAL; 1899 1900 if (ip6gre_netlink_encap_parms(data, &ipencap)) { 1901 int err = ip6_tnl_encap_setup(nt, &ipencap); 1902 1903 if (err < 0) 1904 return err; 1905 } 1906 1907 ip6gre_netlink_parms(data, &p); 1908 1909 t = ip6gre_tunnel_locate(net, &p, 0); 1910 1911 if (t) { 1912 if (t->dev != dev) 1913 return -EEXIST; 1914 } else { 1915 t = nt; 1916 } 1917 1918 ip6gre_tunnel_unlink(ign, t); 1919 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]); 1920 ip6gre_tunnel_link(ign, t); 1921 return 0; 1922 } 1923 1924 static void ip6gre_dellink(struct net_device *dev, struct list_head *head) 1925 { 1926 struct net *net = dev_net(dev); 1927 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1928 1929 if (dev != ign->fb_tunnel_dev) 1930 unregister_netdevice_queue(dev, head); 1931 } 1932 1933 static size_t ip6gre_get_size(const struct net_device *dev) 1934 { 1935 return 1936 /* IFLA_GRE_LINK */ 1937 nla_total_size(4) + 1938 /* IFLA_GRE_IFLAGS */ 1939 nla_total_size(2) + 1940 /* IFLA_GRE_OFLAGS */ 1941 nla_total_size(2) + 1942 /* IFLA_GRE_IKEY */ 1943 nla_total_size(4) + 1944 /* IFLA_GRE_OKEY */ 1945 nla_total_size(4) + 1946 /* IFLA_GRE_LOCAL */ 1947 nla_total_size(sizeof(struct in6_addr)) + 1948 /* IFLA_GRE_REMOTE */ 1949 nla_total_size(sizeof(struct in6_addr)) + 1950 /* IFLA_GRE_TTL */ 1951 nla_total_size(1) + 1952 /* IFLA_GRE_ENCAP_LIMIT */ 1953 nla_total_size(1) + 1954 /* IFLA_GRE_FLOWINFO */ 1955 nla_total_size(4) + 1956 /* IFLA_GRE_FLAGS */ 1957 nla_total_size(4) + 1958 /* IFLA_GRE_ENCAP_TYPE */ 1959 nla_total_size(2) + 1960 /* IFLA_GRE_ENCAP_FLAGS */ 1961 nla_total_size(2) + 1962 /* IFLA_GRE_ENCAP_SPORT */ 1963 nla_total_size(2) + 1964 /* IFLA_GRE_ENCAP_DPORT */ 1965 nla_total_size(2) + 1966 /* IFLA_GRE_COLLECT_METADATA */ 1967 nla_total_size(0) + 1968 /* IFLA_GRE_FWMARK */ 1969 nla_total_size(4) + 1970 /* IFLA_GRE_ERSPAN_INDEX */ 1971 nla_total_size(4) + 1972 0; 1973 } 1974 1975 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev) 1976 { 1977 struct ip6_tnl *t = netdev_priv(dev); 1978 struct __ip6_tnl_parm *p = &t->parms; 1979 1980 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) || 1981 nla_put_be16(skb, IFLA_GRE_IFLAGS, 1982 gre_tnl_flags_to_gre_flags(p->i_flags)) || 1983 nla_put_be16(skb, IFLA_GRE_OFLAGS, 1984 gre_tnl_flags_to_gre_flags(p->o_flags)) || 1985 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) || 1986 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) || 1987 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) || 1988 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) || 1989 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) || 1990 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) || 1991 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) || 1992 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) || 1993 nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark) || 1994 nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index)) 1995 goto nla_put_failure; 1996 1997 if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE, 1998 t->encap.type) || 1999 nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT, 2000 t->encap.sport) || 2001 nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT, 2002 t->encap.dport) || 2003 nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS, 2004 t->encap.flags)) 2005 goto nla_put_failure; 2006 2007 if (p->collect_md) { 2008 if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA)) 2009 goto nla_put_failure; 2010 } 2011 2012 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, p->erspan_ver)) 2013 goto nla_put_failure; 2014 2015 if (p->erspan_ver == 1) { 2016 if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index)) 2017 goto nla_put_failure; 2018 } else if (p->erspan_ver == 2) { 2019 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, p->dir)) 2020 goto nla_put_failure; 2021 if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, p->hwid)) 2022 goto nla_put_failure; 2023 } 2024 2025 return 0; 2026 2027 nla_put_failure: 2028 return -EMSGSIZE; 2029 } 2030 2031 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = { 2032 [IFLA_GRE_LINK] = { .type = NLA_U32 }, 2033 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 }, 2034 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 }, 2035 [IFLA_GRE_IKEY] = { .type = NLA_U32 }, 2036 [IFLA_GRE_OKEY] = { .type = NLA_U32 }, 2037 [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) }, 2038 [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) }, 2039 [IFLA_GRE_TTL] = { .type = NLA_U8 }, 2040 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 }, 2041 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 }, 2042 [IFLA_GRE_FLAGS] = { .type = NLA_U32 }, 2043 [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 }, 2044 [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 }, 2045 [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 }, 2046 [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 }, 2047 [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG }, 2048 [IFLA_GRE_FWMARK] = { .type = NLA_U32 }, 2049 [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 }, 2050 [IFLA_GRE_ERSPAN_VER] = { .type = NLA_U8 }, 2051 [IFLA_GRE_ERSPAN_DIR] = { .type = NLA_U8 }, 2052 [IFLA_GRE_ERSPAN_HWID] = { .type = NLA_U16 }, 2053 }; 2054 2055 static void ip6erspan_tap_setup(struct net_device *dev) 2056 { 2057 ether_setup(dev); 2058 2059 dev->netdev_ops = &ip6erspan_netdev_ops; 2060 dev->needs_free_netdev = true; 2061 dev->priv_destructor = ip6gre_dev_free; 2062 2063 dev->features |= NETIF_F_NETNS_LOCAL; 2064 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 2065 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 2066 netif_keep_dst(dev); 2067 } 2068 2069 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = { 2070 .kind = "ip6gre", 2071 .maxtype = IFLA_GRE_MAX, 2072 .policy = ip6gre_policy, 2073 .priv_size = sizeof(struct ip6_tnl), 2074 .setup = ip6gre_tunnel_setup, 2075 .validate = ip6gre_tunnel_validate, 2076 .newlink = ip6gre_newlink, 2077 .changelink = ip6gre_changelink, 2078 .dellink = ip6gre_dellink, 2079 .get_size = ip6gre_get_size, 2080 .fill_info = ip6gre_fill_info, 2081 .get_link_net = ip6_tnl_get_link_net, 2082 }; 2083 2084 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = { 2085 .kind = "ip6gretap", 2086 .maxtype = IFLA_GRE_MAX, 2087 .policy = ip6gre_policy, 2088 .priv_size = sizeof(struct ip6_tnl), 2089 .setup = ip6gre_tap_setup, 2090 .validate = ip6gre_tap_validate, 2091 .newlink = ip6gre_newlink, 2092 .changelink = ip6gre_changelink, 2093 .get_size = ip6gre_get_size, 2094 .fill_info = ip6gre_fill_info, 2095 .get_link_net = ip6_tnl_get_link_net, 2096 }; 2097 2098 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly = { 2099 .kind = "ip6erspan", 2100 .maxtype = IFLA_GRE_MAX, 2101 .policy = ip6gre_policy, 2102 .priv_size = sizeof(struct ip6_tnl), 2103 .setup = ip6erspan_tap_setup, 2104 .validate = ip6erspan_tap_validate, 2105 .newlink = ip6gre_newlink, 2106 .changelink = ip6gre_changelink, 2107 .get_size = ip6gre_get_size, 2108 .fill_info = ip6gre_fill_info, 2109 .get_link_net = ip6_tnl_get_link_net, 2110 }; 2111 2112 /* 2113 * And now the modules code and kernel interface. 2114 */ 2115 2116 static int __init ip6gre_init(void) 2117 { 2118 int err; 2119 2120 pr_info("GRE over IPv6 tunneling driver\n"); 2121 2122 err = register_pernet_device(&ip6gre_net_ops); 2123 if (err < 0) 2124 return err; 2125 2126 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE); 2127 if (err < 0) { 2128 pr_info("%s: can't add protocol\n", __func__); 2129 goto add_proto_failed; 2130 } 2131 2132 err = rtnl_link_register(&ip6gre_link_ops); 2133 if (err < 0) 2134 goto rtnl_link_failed; 2135 2136 err = rtnl_link_register(&ip6gre_tap_ops); 2137 if (err < 0) 2138 goto tap_ops_failed; 2139 2140 err = rtnl_link_register(&ip6erspan_tap_ops); 2141 if (err < 0) 2142 goto erspan_link_failed; 2143 2144 out: 2145 return err; 2146 2147 erspan_link_failed: 2148 rtnl_link_unregister(&ip6gre_tap_ops); 2149 tap_ops_failed: 2150 rtnl_link_unregister(&ip6gre_link_ops); 2151 rtnl_link_failed: 2152 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE); 2153 add_proto_failed: 2154 unregister_pernet_device(&ip6gre_net_ops); 2155 goto out; 2156 } 2157 2158 static void __exit ip6gre_fini(void) 2159 { 2160 rtnl_link_unregister(&ip6gre_tap_ops); 2161 rtnl_link_unregister(&ip6gre_link_ops); 2162 rtnl_link_unregister(&ip6erspan_tap_ops); 2163 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE); 2164 unregister_pernet_device(&ip6gre_net_ops); 2165 } 2166 2167 module_init(ip6gre_init); 2168 module_exit(ip6gre_fini); 2169 MODULE_LICENSE("GPL"); 2170 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)"); 2171 MODULE_DESCRIPTION("GRE over IPv6 tunneling device"); 2172 MODULE_ALIAS_RTNL_LINK("ip6gre"); 2173 MODULE_ALIAS_RTNL_LINK("ip6gretap"); 2174 MODULE_ALIAS_RTNL_LINK("ip6erspan"); 2175 MODULE_ALIAS_NETDEV("ip6gre0"); 2176