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->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 if (tunnel->parms.o_flags & TUNNEL_SEQ) 700 tunnel->o_seqno++; 701 702 /* Push GRE header. */ 703 protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto; 704 705 if (tunnel->parms.collect_md) { 706 struct ip_tunnel_info *tun_info; 707 const struct ip_tunnel_key *key; 708 __be16 flags; 709 710 tun_info = skb_tunnel_info(skb); 711 if (unlikely(!tun_info || 712 !(tun_info->mode & IP_TUNNEL_INFO_TX) || 713 ip_tunnel_info_af(tun_info) != AF_INET6)) 714 return -EINVAL; 715 716 key = &tun_info->key; 717 memset(fl6, 0, sizeof(*fl6)); 718 fl6->flowi6_proto = IPPROTO_GRE; 719 fl6->daddr = key->u.ipv6.dst; 720 fl6->flowlabel = key->label; 721 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL); 722 723 dsfield = key->tos; 724 flags = key->tun_flags & (TUNNEL_CSUM | TUNNEL_KEY); 725 tunnel->tun_hlen = gre_calc_hlen(flags); 726 727 gre_build_header(skb, tunnel->tun_hlen, 728 flags, protocol, 729 tunnel_id_to_key32(tun_info->key.tun_id), 0); 730 731 } else { 732 gre_build_header(skb, tunnel->tun_hlen, tunnel->parms.o_flags, 733 protocol, tunnel->parms.o_key, 734 htonl(tunnel->o_seqno)); 735 } 736 737 return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu, 738 NEXTHDR_GRE); 739 } 740 741 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev) 742 { 743 struct ip6_tnl *t = netdev_priv(dev); 744 int encap_limit = -1; 745 struct flowi6 fl6; 746 __u8 dsfield = 0; 747 __u32 mtu; 748 int err; 749 750 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); 751 752 if (!t->parms.collect_md) 753 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6, 754 &dsfield, &encap_limit); 755 756 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)); 757 if (err) 758 return -1; 759 760 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, 761 skb->protocol); 762 if (err != 0) { 763 /* XXX: send ICMP error even if DF is not set. */ 764 if (err == -EMSGSIZE) 765 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, 766 htonl(mtu)); 767 return -1; 768 } 769 770 return 0; 771 } 772 773 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev) 774 { 775 struct ip6_tnl *t = netdev_priv(dev); 776 struct ipv6hdr *ipv6h = ipv6_hdr(skb); 777 int encap_limit = -1; 778 struct flowi6 fl6; 779 __u8 dsfield = 0; 780 __u32 mtu; 781 int err; 782 783 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr)) 784 return -1; 785 786 if (!t->parms.collect_md && 787 prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, &dsfield, &encap_limit)) 788 return -1; 789 790 if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM))) 791 return -1; 792 793 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, 794 &mtu, skb->protocol); 795 if (err != 0) { 796 if (err == -EMSGSIZE) 797 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 798 return -1; 799 } 800 801 return 0; 802 } 803 804 /** 805 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own 806 * @t: the outgoing tunnel device 807 * @hdr: IPv6 header from the incoming packet 808 * 809 * Description: 810 * Avoid trivial tunneling loop by checking that tunnel exit-point 811 * doesn't match source of incoming packet. 812 * 813 * Return: 814 * 1 if conflict, 815 * 0 else 816 **/ 817 818 static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t, 819 const struct ipv6hdr *hdr) 820 { 821 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); 822 } 823 824 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev) 825 { 826 struct ip6_tnl *t = netdev_priv(dev); 827 int encap_limit = -1; 828 struct flowi6 fl6; 829 __u32 mtu; 830 int err; 831 832 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 833 encap_limit = t->parms.encap_limit; 834 835 if (!t->parms.collect_md) 836 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); 837 838 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)); 839 if (err) 840 return err; 841 842 err = __gre6_xmit(skb, dev, 0, &fl6, encap_limit, &mtu, skb->protocol); 843 844 return err; 845 } 846 847 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb, 848 struct net_device *dev) 849 { 850 struct ip6_tnl *t = netdev_priv(dev); 851 struct net_device_stats *stats = &t->dev->stats; 852 int ret; 853 854 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr)) 855 goto tx_err; 856 857 switch (skb->protocol) { 858 case htons(ETH_P_IP): 859 ret = ip6gre_xmit_ipv4(skb, dev); 860 break; 861 case htons(ETH_P_IPV6): 862 ret = ip6gre_xmit_ipv6(skb, dev); 863 break; 864 default: 865 ret = ip6gre_xmit_other(skb, dev); 866 break; 867 } 868 869 if (ret < 0) 870 goto tx_err; 871 872 return NETDEV_TX_OK; 873 874 tx_err: 875 stats->tx_errors++; 876 stats->tx_dropped++; 877 kfree_skb(skb); 878 return NETDEV_TX_OK; 879 } 880 881 static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb, 882 struct net_device *dev) 883 { 884 struct ipv6hdr *ipv6h = ipv6_hdr(skb); 885 struct ip6_tnl *t = netdev_priv(dev); 886 struct dst_entry *dst = skb_dst(skb); 887 struct net_device_stats *stats; 888 bool truncate = false; 889 int encap_limit = -1; 890 __u8 dsfield = false; 891 struct flowi6 fl6; 892 int err = -EINVAL; 893 __u32 mtu; 894 895 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr)) 896 goto tx_err; 897 898 if (gre_handle_offloads(skb, false)) 899 goto tx_err; 900 901 if (skb->len > dev->mtu + dev->hard_header_len) { 902 pskb_trim(skb, dev->mtu + dev->hard_header_len); 903 truncate = true; 904 } 905 906 if (skb_cow_head(skb, dev->needed_headroom)) 907 goto tx_err; 908 909 t->parms.o_flags &= ~TUNNEL_KEY; 910 IPCB(skb)->flags = 0; 911 912 /* For collect_md mode, derive fl6 from the tunnel key, 913 * for native mode, call prepare_ip6gre_xmit_{ipv4,ipv6}. 914 */ 915 if (t->parms.collect_md) { 916 struct ip_tunnel_info *tun_info; 917 const struct ip_tunnel_key *key; 918 struct erspan_metadata *md; 919 __be32 tun_id; 920 921 tun_info = skb_tunnel_info(skb); 922 if (unlikely(!tun_info || 923 !(tun_info->mode & IP_TUNNEL_INFO_TX) || 924 ip_tunnel_info_af(tun_info) != AF_INET6)) 925 return -EINVAL; 926 927 key = &tun_info->key; 928 memset(&fl6, 0, sizeof(fl6)); 929 fl6.flowi6_proto = IPPROTO_GRE; 930 fl6.daddr = key->u.ipv6.dst; 931 fl6.flowlabel = key->label; 932 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL); 933 934 dsfield = key->tos; 935 md = ip_tunnel_info_opts(tun_info); 936 if (!md) 937 goto tx_err; 938 939 tun_id = tunnel_id_to_key32(key->tun_id); 940 if (md->version == 1) { 941 erspan_build_header(skb, 942 ntohl(tun_id), 943 ntohl(md->u.index), truncate, 944 false); 945 } else if (md->version == 2) { 946 erspan_build_header_v2(skb, 947 ntohl(tun_id), 948 md->u.md2.dir, 949 get_hwid(&md->u.md2), 950 truncate, false); 951 } else { 952 goto tx_err; 953 } 954 } else { 955 switch (skb->protocol) { 956 case htons(ETH_P_IP): 957 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); 958 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6, 959 &dsfield, &encap_limit); 960 break; 961 case htons(ETH_P_IPV6): 962 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr)) 963 goto tx_err; 964 if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, 965 &dsfield, &encap_limit)) 966 goto tx_err; 967 break; 968 default: 969 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); 970 break; 971 } 972 973 if (t->parms.erspan_ver == 1) 974 erspan_build_header(skb, ntohl(t->parms.o_key), 975 t->parms.index, 976 truncate, false); 977 else 978 erspan_build_header_v2(skb, ntohl(t->parms.o_key), 979 t->parms.dir, 980 t->parms.hwid, 981 truncate, false); 982 fl6.daddr = t->parms.raddr; 983 } 984 985 /* Push GRE header. */ 986 gre_build_header(skb, 8, TUNNEL_SEQ, 987 htons(ETH_P_ERSPAN), 0, htonl(t->o_seqno++)); 988 989 /* TooBig packet may have updated dst->dev's mtu */ 990 if (!t->parms.collect_md && dst && dst_mtu(dst) > dst->dev->mtu) 991 dst->ops->update_pmtu(dst, NULL, skb, dst->dev->mtu); 992 993 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, 994 NEXTHDR_GRE); 995 if (err != 0) { 996 /* XXX: send ICMP error even if DF is not set. */ 997 if (err == -EMSGSIZE) { 998 if (skb->protocol == htons(ETH_P_IP)) 999 icmp_send(skb, ICMP_DEST_UNREACH, 1000 ICMP_FRAG_NEEDED, htonl(mtu)); 1001 else 1002 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 1003 } 1004 1005 goto tx_err; 1006 } 1007 return NETDEV_TX_OK; 1008 1009 tx_err: 1010 stats = &t->dev->stats; 1011 stats->tx_errors++; 1012 stats->tx_dropped++; 1013 kfree_skb(skb); 1014 return NETDEV_TX_OK; 1015 } 1016 1017 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu) 1018 { 1019 struct net_device *dev = t->dev; 1020 struct __ip6_tnl_parm *p = &t->parms; 1021 struct flowi6 *fl6 = &t->fl.u.ip6; 1022 int t_hlen; 1023 1024 if (dev->type != ARPHRD_ETHER) { 1025 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); 1026 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); 1027 } 1028 1029 /* Set up flowi template */ 1030 fl6->saddr = p->laddr; 1031 fl6->daddr = p->raddr; 1032 fl6->flowi6_oif = p->link; 1033 fl6->flowlabel = 0; 1034 fl6->flowi6_proto = IPPROTO_GRE; 1035 1036 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) 1037 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; 1038 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) 1039 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; 1040 1041 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET); 1042 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr); 1043 1044 if (p->flags&IP6_TNL_F_CAP_XMIT && 1045 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER) 1046 dev->flags |= IFF_POINTOPOINT; 1047 else 1048 dev->flags &= ~IFF_POINTOPOINT; 1049 1050 t->tun_hlen = gre_calc_hlen(t->parms.o_flags); 1051 1052 t->hlen = t->encap_hlen + t->tun_hlen; 1053 1054 t_hlen = t->hlen + sizeof(struct ipv6hdr); 1055 1056 if (p->flags & IP6_TNL_F_CAP_XMIT) { 1057 int strict = (ipv6_addr_type(&p->raddr) & 1058 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); 1059 1060 struct rt6_info *rt = rt6_lookup(t->net, 1061 &p->raddr, &p->laddr, 1062 p->link, strict); 1063 1064 if (!rt) 1065 return; 1066 1067 if (rt->dst.dev) { 1068 dev->hard_header_len = rt->dst.dev->hard_header_len + 1069 t_hlen; 1070 1071 if (set_mtu) { 1072 dev->mtu = rt->dst.dev->mtu - t_hlen; 1073 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1074 dev->mtu -= 8; 1075 if (dev->type == ARPHRD_ETHER) 1076 dev->mtu -= ETH_HLEN; 1077 1078 if (dev->mtu < IPV6_MIN_MTU) 1079 dev->mtu = IPV6_MIN_MTU; 1080 } 1081 } 1082 ip6_rt_put(rt); 1083 } 1084 } 1085 1086 static int ip6gre_tnl_change(struct ip6_tnl *t, 1087 const struct __ip6_tnl_parm *p, int set_mtu) 1088 { 1089 t->parms.laddr = p->laddr; 1090 t->parms.raddr = p->raddr; 1091 t->parms.flags = p->flags; 1092 t->parms.hop_limit = p->hop_limit; 1093 t->parms.encap_limit = p->encap_limit; 1094 t->parms.flowinfo = p->flowinfo; 1095 t->parms.link = p->link; 1096 t->parms.proto = p->proto; 1097 t->parms.i_key = p->i_key; 1098 t->parms.o_key = p->o_key; 1099 t->parms.i_flags = p->i_flags; 1100 t->parms.o_flags = p->o_flags; 1101 t->parms.fwmark = p->fwmark; 1102 dst_cache_reset(&t->dst_cache); 1103 ip6gre_tnl_link_config(t, set_mtu); 1104 return 0; 1105 } 1106 1107 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p, 1108 const struct ip6_tnl_parm2 *u) 1109 { 1110 p->laddr = u->laddr; 1111 p->raddr = u->raddr; 1112 p->flags = u->flags; 1113 p->hop_limit = u->hop_limit; 1114 p->encap_limit = u->encap_limit; 1115 p->flowinfo = u->flowinfo; 1116 p->link = u->link; 1117 p->i_key = u->i_key; 1118 p->o_key = u->o_key; 1119 p->i_flags = gre_flags_to_tnl_flags(u->i_flags); 1120 p->o_flags = gre_flags_to_tnl_flags(u->o_flags); 1121 memcpy(p->name, u->name, sizeof(u->name)); 1122 } 1123 1124 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u, 1125 const struct __ip6_tnl_parm *p) 1126 { 1127 u->proto = IPPROTO_GRE; 1128 u->laddr = p->laddr; 1129 u->raddr = p->raddr; 1130 u->flags = p->flags; 1131 u->hop_limit = p->hop_limit; 1132 u->encap_limit = p->encap_limit; 1133 u->flowinfo = p->flowinfo; 1134 u->link = p->link; 1135 u->i_key = p->i_key; 1136 u->o_key = p->o_key; 1137 u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags); 1138 u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags); 1139 memcpy(u->name, p->name, sizeof(u->name)); 1140 } 1141 1142 static int ip6gre_tunnel_ioctl(struct net_device *dev, 1143 struct ifreq *ifr, int cmd) 1144 { 1145 int err = 0; 1146 struct ip6_tnl_parm2 p; 1147 struct __ip6_tnl_parm p1; 1148 struct ip6_tnl *t = netdev_priv(dev); 1149 struct net *net = t->net; 1150 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1151 1152 memset(&p1, 0, sizeof(p1)); 1153 1154 switch (cmd) { 1155 case SIOCGETTUNNEL: 1156 if (dev == ign->fb_tunnel_dev) { 1157 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { 1158 err = -EFAULT; 1159 break; 1160 } 1161 ip6gre_tnl_parm_from_user(&p1, &p); 1162 t = ip6gre_tunnel_locate(net, &p1, 0); 1163 if (!t) 1164 t = netdev_priv(dev); 1165 } 1166 memset(&p, 0, sizeof(p)); 1167 ip6gre_tnl_parm_to_user(&p, &t->parms); 1168 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) 1169 err = -EFAULT; 1170 break; 1171 1172 case SIOCADDTUNNEL: 1173 case SIOCCHGTUNNEL: 1174 err = -EPERM; 1175 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1176 goto done; 1177 1178 err = -EFAULT; 1179 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 1180 goto done; 1181 1182 err = -EINVAL; 1183 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING)) 1184 goto done; 1185 1186 if (!(p.i_flags&GRE_KEY)) 1187 p.i_key = 0; 1188 if (!(p.o_flags&GRE_KEY)) 1189 p.o_key = 0; 1190 1191 ip6gre_tnl_parm_from_user(&p1, &p); 1192 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL); 1193 1194 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { 1195 if (t) { 1196 if (t->dev != dev) { 1197 err = -EEXIST; 1198 break; 1199 } 1200 } else { 1201 t = netdev_priv(dev); 1202 1203 ip6gre_tunnel_unlink(ign, t); 1204 synchronize_net(); 1205 ip6gre_tnl_change(t, &p1, 1); 1206 ip6gre_tunnel_link(ign, t); 1207 netdev_state_change(dev); 1208 } 1209 } 1210 1211 if (t) { 1212 err = 0; 1213 1214 memset(&p, 0, sizeof(p)); 1215 ip6gre_tnl_parm_to_user(&p, &t->parms); 1216 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) 1217 err = -EFAULT; 1218 } else 1219 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); 1220 break; 1221 1222 case SIOCDELTUNNEL: 1223 err = -EPERM; 1224 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1225 goto done; 1226 1227 if (dev == ign->fb_tunnel_dev) { 1228 err = -EFAULT; 1229 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 1230 goto done; 1231 err = -ENOENT; 1232 ip6gre_tnl_parm_from_user(&p1, &p); 1233 t = ip6gre_tunnel_locate(net, &p1, 0); 1234 if (!t) 1235 goto done; 1236 err = -EPERM; 1237 if (t == netdev_priv(ign->fb_tunnel_dev)) 1238 goto done; 1239 dev = t->dev; 1240 } 1241 unregister_netdevice(dev); 1242 err = 0; 1243 break; 1244 1245 default: 1246 err = -EINVAL; 1247 } 1248 1249 done: 1250 return err; 1251 } 1252 1253 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev, 1254 unsigned short type, const void *daddr, 1255 const void *saddr, unsigned int len) 1256 { 1257 struct ip6_tnl *t = netdev_priv(dev); 1258 struct ipv6hdr *ipv6h; 1259 __be16 *p; 1260 1261 ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h)); 1262 ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb, 1263 t->fl.u.ip6.flowlabel, 1264 true, &t->fl.u.ip6)); 1265 ipv6h->hop_limit = t->parms.hop_limit; 1266 ipv6h->nexthdr = NEXTHDR_GRE; 1267 ipv6h->saddr = t->parms.laddr; 1268 ipv6h->daddr = t->parms.raddr; 1269 1270 p = (__be16 *)(ipv6h + 1); 1271 p[0] = t->parms.o_flags; 1272 p[1] = htons(type); 1273 1274 /* 1275 * Set the source hardware address. 1276 */ 1277 1278 if (saddr) 1279 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr)); 1280 if (daddr) 1281 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr)); 1282 if (!ipv6_addr_any(&ipv6h->daddr)) 1283 return t->hlen; 1284 1285 return -t->hlen; 1286 } 1287 1288 static const struct header_ops ip6gre_header_ops = { 1289 .create = ip6gre_header, 1290 }; 1291 1292 static const struct net_device_ops ip6gre_netdev_ops = { 1293 .ndo_init = ip6gre_tunnel_init, 1294 .ndo_uninit = ip6gre_tunnel_uninit, 1295 .ndo_start_xmit = ip6gre_tunnel_xmit, 1296 .ndo_do_ioctl = ip6gre_tunnel_ioctl, 1297 .ndo_change_mtu = ip6_tnl_change_mtu, 1298 .ndo_get_stats64 = ip_tunnel_get_stats64, 1299 .ndo_get_iflink = ip6_tnl_get_iflink, 1300 }; 1301 1302 static void ip6gre_dev_free(struct net_device *dev) 1303 { 1304 struct ip6_tnl *t = netdev_priv(dev); 1305 1306 dst_cache_destroy(&t->dst_cache); 1307 free_percpu(dev->tstats); 1308 } 1309 1310 static void ip6gre_tunnel_setup(struct net_device *dev) 1311 { 1312 dev->netdev_ops = &ip6gre_netdev_ops; 1313 dev->needs_free_netdev = true; 1314 dev->priv_destructor = ip6gre_dev_free; 1315 1316 dev->type = ARPHRD_IP6GRE; 1317 1318 dev->flags |= IFF_NOARP; 1319 dev->addr_len = sizeof(struct in6_addr); 1320 netif_keep_dst(dev); 1321 /* This perm addr will be used as interface identifier by IPv6 */ 1322 dev->addr_assign_type = NET_ADDR_RANDOM; 1323 eth_random_addr(dev->perm_addr); 1324 } 1325 1326 #define GRE6_FEATURES (NETIF_F_SG | \ 1327 NETIF_F_FRAGLIST | \ 1328 NETIF_F_HIGHDMA | \ 1329 NETIF_F_HW_CSUM) 1330 1331 static void ip6gre_tnl_init_features(struct net_device *dev) 1332 { 1333 struct ip6_tnl *nt = netdev_priv(dev); 1334 1335 dev->features |= GRE6_FEATURES; 1336 dev->hw_features |= GRE6_FEATURES; 1337 1338 if (!(nt->parms.o_flags & TUNNEL_SEQ)) { 1339 /* TCP offload with GRE SEQ is not supported, nor 1340 * can we support 2 levels of outer headers requiring 1341 * an update. 1342 */ 1343 if (!(nt->parms.o_flags & TUNNEL_CSUM) || 1344 nt->encap.type == TUNNEL_ENCAP_NONE) { 1345 dev->features |= NETIF_F_GSO_SOFTWARE; 1346 dev->hw_features |= NETIF_F_GSO_SOFTWARE; 1347 } 1348 1349 /* Can use a lockless transmit, unless we generate 1350 * output sequences 1351 */ 1352 dev->features |= NETIF_F_LLTX; 1353 } 1354 } 1355 1356 static int ip6gre_tunnel_init_common(struct net_device *dev) 1357 { 1358 struct ip6_tnl *tunnel; 1359 int ret; 1360 int t_hlen; 1361 1362 tunnel = netdev_priv(dev); 1363 1364 tunnel->dev = dev; 1365 tunnel->net = dev_net(dev); 1366 strcpy(tunnel->parms.name, dev->name); 1367 1368 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 1369 if (!dev->tstats) 1370 return -ENOMEM; 1371 1372 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); 1373 if (ret) { 1374 free_percpu(dev->tstats); 1375 dev->tstats = NULL; 1376 return ret; 1377 } 1378 1379 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags); 1380 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen; 1381 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr); 1382 1383 dev->hard_header_len = LL_MAX_HEADER + t_hlen; 1384 dev->mtu = ETH_DATA_LEN - t_hlen; 1385 if (dev->type == ARPHRD_ETHER) 1386 dev->mtu -= ETH_HLEN; 1387 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1388 dev->mtu -= 8; 1389 1390 if (tunnel->parms.collect_md) { 1391 dev->features |= NETIF_F_NETNS_LOCAL; 1392 netif_keep_dst(dev); 1393 } 1394 ip6gre_tnl_init_features(dev); 1395 1396 return 0; 1397 } 1398 1399 static int ip6gre_tunnel_init(struct net_device *dev) 1400 { 1401 struct ip6_tnl *tunnel; 1402 int ret; 1403 1404 ret = ip6gre_tunnel_init_common(dev); 1405 if (ret) 1406 return ret; 1407 1408 tunnel = netdev_priv(dev); 1409 1410 if (tunnel->parms.collect_md) 1411 return 0; 1412 1413 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr)); 1414 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr)); 1415 1416 if (ipv6_addr_any(&tunnel->parms.raddr)) 1417 dev->header_ops = &ip6gre_header_ops; 1418 1419 return 0; 1420 } 1421 1422 static void ip6gre_fb_tunnel_init(struct net_device *dev) 1423 { 1424 struct ip6_tnl *tunnel = netdev_priv(dev); 1425 1426 tunnel->dev = dev; 1427 tunnel->net = dev_net(dev); 1428 strcpy(tunnel->parms.name, dev->name); 1429 1430 tunnel->hlen = sizeof(struct ipv6hdr) + 4; 1431 1432 dev_hold(dev); 1433 } 1434 1435 static struct inet6_protocol ip6gre_protocol __read_mostly = { 1436 .handler = gre_rcv, 1437 .err_handler = ip6gre_err, 1438 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 1439 }; 1440 1441 static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head) 1442 { 1443 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1444 struct net_device *dev, *aux; 1445 int prio; 1446 1447 for_each_netdev_safe(net, dev, aux) 1448 if (dev->rtnl_link_ops == &ip6gre_link_ops || 1449 dev->rtnl_link_ops == &ip6gre_tap_ops || 1450 dev->rtnl_link_ops == &ip6erspan_tap_ops) 1451 unregister_netdevice_queue(dev, head); 1452 1453 for (prio = 0; prio < 4; prio++) { 1454 int h; 1455 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) { 1456 struct ip6_tnl *t; 1457 1458 t = rtnl_dereference(ign->tunnels[prio][h]); 1459 1460 while (t) { 1461 /* If dev is in the same netns, it has already 1462 * been added to the list by the previous loop. 1463 */ 1464 if (!net_eq(dev_net(t->dev), net)) 1465 unregister_netdevice_queue(t->dev, 1466 head); 1467 t = rtnl_dereference(t->next); 1468 } 1469 } 1470 } 1471 } 1472 1473 static int __net_init ip6gre_init_net(struct net *net) 1474 { 1475 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1476 int err; 1477 1478 ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0", 1479 NET_NAME_UNKNOWN, 1480 ip6gre_tunnel_setup); 1481 if (!ign->fb_tunnel_dev) { 1482 err = -ENOMEM; 1483 goto err_alloc_dev; 1484 } 1485 dev_net_set(ign->fb_tunnel_dev, net); 1486 /* FB netdevice is special: we have one, and only one per netns. 1487 * Allowing to move it to another netns is clearly unsafe. 1488 */ 1489 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL; 1490 1491 1492 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev); 1493 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops; 1494 1495 err = register_netdev(ign->fb_tunnel_dev); 1496 if (err) 1497 goto err_reg_dev; 1498 1499 rcu_assign_pointer(ign->tunnels_wc[0], 1500 netdev_priv(ign->fb_tunnel_dev)); 1501 return 0; 1502 1503 err_reg_dev: 1504 free_netdev(ign->fb_tunnel_dev); 1505 err_alloc_dev: 1506 return err; 1507 } 1508 1509 static void __net_exit ip6gre_exit_batch_net(struct list_head *net_list) 1510 { 1511 struct net *net; 1512 LIST_HEAD(list); 1513 1514 rtnl_lock(); 1515 list_for_each_entry(net, net_list, exit_list) 1516 ip6gre_destroy_tunnels(net, &list); 1517 unregister_netdevice_many(&list); 1518 rtnl_unlock(); 1519 } 1520 1521 static struct pernet_operations ip6gre_net_ops = { 1522 .init = ip6gre_init_net, 1523 .exit_batch = ip6gre_exit_batch_net, 1524 .id = &ip6gre_net_id, 1525 .size = sizeof(struct ip6gre_net), 1526 }; 1527 1528 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[], 1529 struct netlink_ext_ack *extack) 1530 { 1531 __be16 flags; 1532 1533 if (!data) 1534 return 0; 1535 1536 flags = 0; 1537 if (data[IFLA_GRE_IFLAGS]) 1538 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); 1539 if (data[IFLA_GRE_OFLAGS]) 1540 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); 1541 if (flags & (GRE_VERSION|GRE_ROUTING)) 1542 return -EINVAL; 1543 1544 return 0; 1545 } 1546 1547 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[], 1548 struct netlink_ext_ack *extack) 1549 { 1550 struct in6_addr daddr; 1551 1552 if (tb[IFLA_ADDRESS]) { 1553 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 1554 return -EINVAL; 1555 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 1556 return -EADDRNOTAVAIL; 1557 } 1558 1559 if (!data) 1560 goto out; 1561 1562 if (data[IFLA_GRE_REMOTE]) { 1563 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]); 1564 if (ipv6_addr_any(&daddr)) 1565 return -EINVAL; 1566 } 1567 1568 out: 1569 return ip6gre_tunnel_validate(tb, data, extack); 1570 } 1571 1572 static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[], 1573 struct netlink_ext_ack *extack) 1574 { 1575 __be16 flags = 0; 1576 int ret, ver = 0; 1577 1578 if (!data) 1579 return 0; 1580 1581 ret = ip6gre_tap_validate(tb, data, extack); 1582 if (ret) 1583 return ret; 1584 1585 /* ERSPAN should only have GRE sequence and key flag */ 1586 if (data[IFLA_GRE_OFLAGS]) 1587 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); 1588 if (data[IFLA_GRE_IFLAGS]) 1589 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); 1590 if (!data[IFLA_GRE_COLLECT_METADATA] && 1591 flags != (GRE_SEQ | GRE_KEY)) 1592 return -EINVAL; 1593 1594 /* ERSPAN Session ID only has 10-bit. Since we reuse 1595 * 32-bit key field as ID, check it's range. 1596 */ 1597 if (data[IFLA_GRE_IKEY] && 1598 (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK)) 1599 return -EINVAL; 1600 1601 if (data[IFLA_GRE_OKEY] && 1602 (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK)) 1603 return -EINVAL; 1604 1605 if (data[IFLA_GRE_ERSPAN_VER]) { 1606 ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]); 1607 if (ver != 1 && ver != 2) 1608 return -EINVAL; 1609 } 1610 1611 if (ver == 1) { 1612 if (data[IFLA_GRE_ERSPAN_INDEX]) { 1613 u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]); 1614 1615 if (index & ~INDEX_MASK) 1616 return -EINVAL; 1617 } 1618 } else if (ver == 2) { 1619 if (data[IFLA_GRE_ERSPAN_DIR]) { 1620 u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]); 1621 1622 if (dir & ~(DIR_MASK >> DIR_OFFSET)) 1623 return -EINVAL; 1624 } 1625 1626 if (data[IFLA_GRE_ERSPAN_HWID]) { 1627 u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]); 1628 1629 if (hwid & ~(HWID_MASK >> HWID_OFFSET)) 1630 return -EINVAL; 1631 } 1632 } 1633 1634 return 0; 1635 } 1636 1637 static void ip6gre_netlink_parms(struct nlattr *data[], 1638 struct __ip6_tnl_parm *parms) 1639 { 1640 memset(parms, 0, sizeof(*parms)); 1641 1642 if (!data) 1643 return; 1644 1645 if (data[IFLA_GRE_LINK]) 1646 parms->link = nla_get_u32(data[IFLA_GRE_LINK]); 1647 1648 if (data[IFLA_GRE_IFLAGS]) 1649 parms->i_flags = gre_flags_to_tnl_flags( 1650 nla_get_be16(data[IFLA_GRE_IFLAGS])); 1651 1652 if (data[IFLA_GRE_OFLAGS]) 1653 parms->o_flags = gre_flags_to_tnl_flags( 1654 nla_get_be16(data[IFLA_GRE_OFLAGS])); 1655 1656 if (data[IFLA_GRE_IKEY]) 1657 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]); 1658 1659 if (data[IFLA_GRE_OKEY]) 1660 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]); 1661 1662 if (data[IFLA_GRE_LOCAL]) 1663 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]); 1664 1665 if (data[IFLA_GRE_REMOTE]) 1666 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]); 1667 1668 if (data[IFLA_GRE_TTL]) 1669 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]); 1670 1671 if (data[IFLA_GRE_ENCAP_LIMIT]) 1672 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]); 1673 1674 if (data[IFLA_GRE_FLOWINFO]) 1675 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]); 1676 1677 if (data[IFLA_GRE_FLAGS]) 1678 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]); 1679 1680 if (data[IFLA_GRE_FWMARK]) 1681 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]); 1682 1683 if (data[IFLA_GRE_COLLECT_METADATA]) 1684 parms->collect_md = true; 1685 1686 if (data[IFLA_GRE_ERSPAN_VER]) 1687 parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]); 1688 1689 if (parms->erspan_ver == 1) { 1690 if (data[IFLA_GRE_ERSPAN_INDEX]) 1691 parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]); 1692 } else if (parms->erspan_ver == 2) { 1693 if (data[IFLA_GRE_ERSPAN_DIR]) 1694 parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]); 1695 if (data[IFLA_GRE_ERSPAN_HWID]) 1696 parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]); 1697 } 1698 } 1699 1700 static int ip6gre_tap_init(struct net_device *dev) 1701 { 1702 int ret; 1703 1704 ret = ip6gre_tunnel_init_common(dev); 1705 if (ret) 1706 return ret; 1707 1708 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 1709 1710 return 0; 1711 } 1712 1713 static const struct net_device_ops ip6gre_tap_netdev_ops = { 1714 .ndo_init = ip6gre_tap_init, 1715 .ndo_uninit = ip6gre_tunnel_uninit, 1716 .ndo_start_xmit = ip6gre_tunnel_xmit, 1717 .ndo_set_mac_address = eth_mac_addr, 1718 .ndo_validate_addr = eth_validate_addr, 1719 .ndo_change_mtu = ip6_tnl_change_mtu, 1720 .ndo_get_stats64 = ip_tunnel_get_stats64, 1721 .ndo_get_iflink = ip6_tnl_get_iflink, 1722 }; 1723 1724 static int ip6erspan_tap_init(struct net_device *dev) 1725 { 1726 struct ip6_tnl *tunnel; 1727 int t_hlen; 1728 int ret; 1729 1730 tunnel = netdev_priv(dev); 1731 1732 tunnel->dev = dev; 1733 tunnel->net = dev_net(dev); 1734 strcpy(tunnel->parms.name, dev->name); 1735 1736 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 1737 if (!dev->tstats) 1738 return -ENOMEM; 1739 1740 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); 1741 if (ret) { 1742 free_percpu(dev->tstats); 1743 dev->tstats = NULL; 1744 return ret; 1745 } 1746 1747 tunnel->tun_hlen = 8; 1748 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen + 1749 erspan_hdr_len(tunnel->parms.erspan_ver); 1750 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr); 1751 1752 dev->hard_header_len = LL_MAX_HEADER + t_hlen; 1753 dev->mtu = ETH_DATA_LEN - t_hlen; 1754 if (dev->type == ARPHRD_ETHER) 1755 dev->mtu -= ETH_HLEN; 1756 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1757 dev->mtu -= 8; 1758 1759 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 1760 tunnel = netdev_priv(dev); 1761 ip6gre_tnl_link_config(tunnel, 1); 1762 1763 return 0; 1764 } 1765 1766 static const struct net_device_ops ip6erspan_netdev_ops = { 1767 .ndo_init = ip6erspan_tap_init, 1768 .ndo_uninit = ip6gre_tunnel_uninit, 1769 .ndo_start_xmit = ip6erspan_tunnel_xmit, 1770 .ndo_set_mac_address = eth_mac_addr, 1771 .ndo_validate_addr = eth_validate_addr, 1772 .ndo_change_mtu = ip6_tnl_change_mtu, 1773 .ndo_get_stats64 = ip_tunnel_get_stats64, 1774 .ndo_get_iflink = ip6_tnl_get_iflink, 1775 }; 1776 1777 static void ip6gre_tap_setup(struct net_device *dev) 1778 { 1779 1780 ether_setup(dev); 1781 1782 dev->max_mtu = 0; 1783 dev->netdev_ops = &ip6gre_tap_netdev_ops; 1784 dev->needs_free_netdev = true; 1785 dev->priv_destructor = ip6gre_dev_free; 1786 1787 dev->features |= NETIF_F_NETNS_LOCAL; 1788 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1789 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 1790 netif_keep_dst(dev); 1791 } 1792 1793 static bool ip6gre_netlink_encap_parms(struct nlattr *data[], 1794 struct ip_tunnel_encap *ipencap) 1795 { 1796 bool ret = false; 1797 1798 memset(ipencap, 0, sizeof(*ipencap)); 1799 1800 if (!data) 1801 return ret; 1802 1803 if (data[IFLA_GRE_ENCAP_TYPE]) { 1804 ret = true; 1805 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]); 1806 } 1807 1808 if (data[IFLA_GRE_ENCAP_FLAGS]) { 1809 ret = true; 1810 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]); 1811 } 1812 1813 if (data[IFLA_GRE_ENCAP_SPORT]) { 1814 ret = true; 1815 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]); 1816 } 1817 1818 if (data[IFLA_GRE_ENCAP_DPORT]) { 1819 ret = true; 1820 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]); 1821 } 1822 1823 return ret; 1824 } 1825 1826 static int ip6gre_newlink(struct net *src_net, struct net_device *dev, 1827 struct nlattr *tb[], struct nlattr *data[], 1828 struct netlink_ext_ack *extack) 1829 { 1830 struct ip6_tnl *nt; 1831 struct net *net = dev_net(dev); 1832 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1833 struct ip_tunnel_encap ipencap; 1834 int err; 1835 1836 nt = netdev_priv(dev); 1837 1838 if (ip6gre_netlink_encap_parms(data, &ipencap)) { 1839 int err = ip6_tnl_encap_setup(nt, &ipencap); 1840 1841 if (err < 0) 1842 return err; 1843 } 1844 1845 ip6gre_netlink_parms(data, &nt->parms); 1846 1847 if (nt->parms.collect_md) { 1848 if (rtnl_dereference(ign->collect_md_tun)) 1849 return -EEXIST; 1850 } else { 1851 if (ip6gre_tunnel_find(net, &nt->parms, dev->type)) 1852 return -EEXIST; 1853 } 1854 1855 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS]) 1856 eth_hw_addr_random(dev); 1857 1858 nt->dev = dev; 1859 nt->net = dev_net(dev); 1860 1861 err = register_netdevice(dev); 1862 if (err) 1863 goto out; 1864 1865 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]); 1866 1867 if (tb[IFLA_MTU]) 1868 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 1869 1870 dev_hold(dev); 1871 ip6gre_tunnel_link(ign, nt); 1872 1873 out: 1874 return err; 1875 } 1876 1877 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[], 1878 struct nlattr *data[], 1879 struct netlink_ext_ack *extack) 1880 { 1881 struct ip6_tnl *t, *nt = netdev_priv(dev); 1882 struct net *net = nt->net; 1883 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1884 struct __ip6_tnl_parm p; 1885 struct ip_tunnel_encap ipencap; 1886 1887 if (dev == ign->fb_tunnel_dev) 1888 return -EINVAL; 1889 1890 if (ip6gre_netlink_encap_parms(data, &ipencap)) { 1891 int err = ip6_tnl_encap_setup(nt, &ipencap); 1892 1893 if (err < 0) 1894 return err; 1895 } 1896 1897 ip6gre_netlink_parms(data, &p); 1898 1899 t = ip6gre_tunnel_locate(net, &p, 0); 1900 1901 if (t) { 1902 if (t->dev != dev) 1903 return -EEXIST; 1904 } else { 1905 t = nt; 1906 } 1907 1908 ip6gre_tunnel_unlink(ign, t); 1909 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]); 1910 ip6gre_tunnel_link(ign, t); 1911 return 0; 1912 } 1913 1914 static void ip6gre_dellink(struct net_device *dev, struct list_head *head) 1915 { 1916 struct net *net = dev_net(dev); 1917 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1918 1919 if (dev != ign->fb_tunnel_dev) 1920 unregister_netdevice_queue(dev, head); 1921 } 1922 1923 static size_t ip6gre_get_size(const struct net_device *dev) 1924 { 1925 return 1926 /* IFLA_GRE_LINK */ 1927 nla_total_size(4) + 1928 /* IFLA_GRE_IFLAGS */ 1929 nla_total_size(2) + 1930 /* IFLA_GRE_OFLAGS */ 1931 nla_total_size(2) + 1932 /* IFLA_GRE_IKEY */ 1933 nla_total_size(4) + 1934 /* IFLA_GRE_OKEY */ 1935 nla_total_size(4) + 1936 /* IFLA_GRE_LOCAL */ 1937 nla_total_size(sizeof(struct in6_addr)) + 1938 /* IFLA_GRE_REMOTE */ 1939 nla_total_size(sizeof(struct in6_addr)) + 1940 /* IFLA_GRE_TTL */ 1941 nla_total_size(1) + 1942 /* IFLA_GRE_ENCAP_LIMIT */ 1943 nla_total_size(1) + 1944 /* IFLA_GRE_FLOWINFO */ 1945 nla_total_size(4) + 1946 /* IFLA_GRE_FLAGS */ 1947 nla_total_size(4) + 1948 /* IFLA_GRE_ENCAP_TYPE */ 1949 nla_total_size(2) + 1950 /* IFLA_GRE_ENCAP_FLAGS */ 1951 nla_total_size(2) + 1952 /* IFLA_GRE_ENCAP_SPORT */ 1953 nla_total_size(2) + 1954 /* IFLA_GRE_ENCAP_DPORT */ 1955 nla_total_size(2) + 1956 /* IFLA_GRE_COLLECT_METADATA */ 1957 nla_total_size(0) + 1958 /* IFLA_GRE_FWMARK */ 1959 nla_total_size(4) + 1960 /* IFLA_GRE_ERSPAN_INDEX */ 1961 nla_total_size(4) + 1962 0; 1963 } 1964 1965 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev) 1966 { 1967 struct ip6_tnl *t = netdev_priv(dev); 1968 struct __ip6_tnl_parm *p = &t->parms; 1969 1970 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) || 1971 nla_put_be16(skb, IFLA_GRE_IFLAGS, 1972 gre_tnl_flags_to_gre_flags(p->i_flags)) || 1973 nla_put_be16(skb, IFLA_GRE_OFLAGS, 1974 gre_tnl_flags_to_gre_flags(p->o_flags)) || 1975 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) || 1976 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) || 1977 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) || 1978 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) || 1979 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) || 1980 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) || 1981 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) || 1982 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) || 1983 nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark) || 1984 nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index)) 1985 goto nla_put_failure; 1986 1987 if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE, 1988 t->encap.type) || 1989 nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT, 1990 t->encap.sport) || 1991 nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT, 1992 t->encap.dport) || 1993 nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS, 1994 t->encap.flags)) 1995 goto nla_put_failure; 1996 1997 if (p->collect_md) { 1998 if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA)) 1999 goto nla_put_failure; 2000 } 2001 2002 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, p->erspan_ver)) 2003 goto nla_put_failure; 2004 2005 if (p->erspan_ver == 1) { 2006 if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index)) 2007 goto nla_put_failure; 2008 } else if (p->erspan_ver == 2) { 2009 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, p->dir)) 2010 goto nla_put_failure; 2011 if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, p->hwid)) 2012 goto nla_put_failure; 2013 } 2014 2015 return 0; 2016 2017 nla_put_failure: 2018 return -EMSGSIZE; 2019 } 2020 2021 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = { 2022 [IFLA_GRE_LINK] = { .type = NLA_U32 }, 2023 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 }, 2024 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 }, 2025 [IFLA_GRE_IKEY] = { .type = NLA_U32 }, 2026 [IFLA_GRE_OKEY] = { .type = NLA_U32 }, 2027 [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) }, 2028 [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) }, 2029 [IFLA_GRE_TTL] = { .type = NLA_U8 }, 2030 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 }, 2031 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 }, 2032 [IFLA_GRE_FLAGS] = { .type = NLA_U32 }, 2033 [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 }, 2034 [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 }, 2035 [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 }, 2036 [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 }, 2037 [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG }, 2038 [IFLA_GRE_FWMARK] = { .type = NLA_U32 }, 2039 [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 }, 2040 [IFLA_GRE_ERSPAN_VER] = { .type = NLA_U8 }, 2041 [IFLA_GRE_ERSPAN_DIR] = { .type = NLA_U8 }, 2042 [IFLA_GRE_ERSPAN_HWID] = { .type = NLA_U16 }, 2043 }; 2044 2045 static void ip6erspan_tap_setup(struct net_device *dev) 2046 { 2047 ether_setup(dev); 2048 2049 dev->netdev_ops = &ip6erspan_netdev_ops; 2050 dev->needs_free_netdev = true; 2051 dev->priv_destructor = ip6gre_dev_free; 2052 2053 dev->features |= NETIF_F_NETNS_LOCAL; 2054 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 2055 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 2056 netif_keep_dst(dev); 2057 } 2058 2059 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = { 2060 .kind = "ip6gre", 2061 .maxtype = IFLA_GRE_MAX, 2062 .policy = ip6gre_policy, 2063 .priv_size = sizeof(struct ip6_tnl), 2064 .setup = ip6gre_tunnel_setup, 2065 .validate = ip6gre_tunnel_validate, 2066 .newlink = ip6gre_newlink, 2067 .changelink = ip6gre_changelink, 2068 .dellink = ip6gre_dellink, 2069 .get_size = ip6gre_get_size, 2070 .fill_info = ip6gre_fill_info, 2071 .get_link_net = ip6_tnl_get_link_net, 2072 }; 2073 2074 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = { 2075 .kind = "ip6gretap", 2076 .maxtype = IFLA_GRE_MAX, 2077 .policy = ip6gre_policy, 2078 .priv_size = sizeof(struct ip6_tnl), 2079 .setup = ip6gre_tap_setup, 2080 .validate = ip6gre_tap_validate, 2081 .newlink = ip6gre_newlink, 2082 .changelink = ip6gre_changelink, 2083 .get_size = ip6gre_get_size, 2084 .fill_info = ip6gre_fill_info, 2085 .get_link_net = ip6_tnl_get_link_net, 2086 }; 2087 2088 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly = { 2089 .kind = "ip6erspan", 2090 .maxtype = IFLA_GRE_MAX, 2091 .policy = ip6gre_policy, 2092 .priv_size = sizeof(struct ip6_tnl), 2093 .setup = ip6erspan_tap_setup, 2094 .validate = ip6erspan_tap_validate, 2095 .newlink = ip6gre_newlink, 2096 .changelink = ip6gre_changelink, 2097 .get_size = ip6gre_get_size, 2098 .fill_info = ip6gre_fill_info, 2099 .get_link_net = ip6_tnl_get_link_net, 2100 }; 2101 2102 /* 2103 * And now the modules code and kernel interface. 2104 */ 2105 2106 static int __init ip6gre_init(void) 2107 { 2108 int err; 2109 2110 pr_info("GRE over IPv6 tunneling driver\n"); 2111 2112 err = register_pernet_device(&ip6gre_net_ops); 2113 if (err < 0) 2114 return err; 2115 2116 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE); 2117 if (err < 0) { 2118 pr_info("%s: can't add protocol\n", __func__); 2119 goto add_proto_failed; 2120 } 2121 2122 err = rtnl_link_register(&ip6gre_link_ops); 2123 if (err < 0) 2124 goto rtnl_link_failed; 2125 2126 err = rtnl_link_register(&ip6gre_tap_ops); 2127 if (err < 0) 2128 goto tap_ops_failed; 2129 2130 err = rtnl_link_register(&ip6erspan_tap_ops); 2131 if (err < 0) 2132 goto erspan_link_failed; 2133 2134 out: 2135 return err; 2136 2137 erspan_link_failed: 2138 rtnl_link_unregister(&ip6gre_tap_ops); 2139 tap_ops_failed: 2140 rtnl_link_unregister(&ip6gre_link_ops); 2141 rtnl_link_failed: 2142 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE); 2143 add_proto_failed: 2144 unregister_pernet_device(&ip6gre_net_ops); 2145 goto out; 2146 } 2147 2148 static void __exit ip6gre_fini(void) 2149 { 2150 rtnl_link_unregister(&ip6gre_tap_ops); 2151 rtnl_link_unregister(&ip6gre_link_ops); 2152 rtnl_link_unregister(&ip6erspan_tap_ops); 2153 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE); 2154 unregister_pernet_device(&ip6gre_net_ops); 2155 } 2156 2157 module_init(ip6gre_init); 2158 module_exit(ip6gre_fini); 2159 MODULE_LICENSE("GPL"); 2160 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)"); 2161 MODULE_DESCRIPTION("GRE over IPv6 tunneling device"); 2162 MODULE_ALIAS_RTNL_LINK("ip6gre"); 2163 MODULE_ALIAS_RTNL_LINK("ip6gretap"); 2164 MODULE_ALIAS_RTNL_LINK("ip6erspan"); 2165 MODULE_ALIAS_NETDEV("ip6gre0"); 2166