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 ARPHRD_ETHER : ARPHRD_IP6GRE; 131 int score, cand_score = 4; 132 133 for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) { 134 if (!ipv6_addr_equal(local, &t->parms.laddr) || 135 !ipv6_addr_equal(remote, &t->parms.raddr) || 136 key != t->parms.i_key || 137 !(t->dev->flags & IFF_UP)) 138 continue; 139 140 if (t->dev->type != ARPHRD_IP6GRE && 141 t->dev->type != dev_type) 142 continue; 143 144 score = 0; 145 if (t->parms.link != link) 146 score |= 1; 147 if (t->dev->type != dev_type) 148 score |= 2; 149 if (score == 0) 150 return t; 151 152 if (score < cand_score) { 153 cand = t; 154 cand_score = score; 155 } 156 } 157 158 for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) { 159 if (!ipv6_addr_equal(remote, &t->parms.raddr) || 160 key != t->parms.i_key || 161 !(t->dev->flags & IFF_UP)) 162 continue; 163 164 if (t->dev->type != ARPHRD_IP6GRE && 165 t->dev->type != dev_type) 166 continue; 167 168 score = 0; 169 if (t->parms.link != link) 170 score |= 1; 171 if (t->dev->type != dev_type) 172 score |= 2; 173 if (score == 0) 174 return t; 175 176 if (score < cand_score) { 177 cand = t; 178 cand_score = score; 179 } 180 } 181 182 for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) { 183 if ((!ipv6_addr_equal(local, &t->parms.laddr) && 184 (!ipv6_addr_equal(local, &t->parms.raddr) || 185 !ipv6_addr_is_multicast(local))) || 186 key != t->parms.i_key || 187 !(t->dev->flags & IFF_UP)) 188 continue; 189 190 if (t->dev->type != ARPHRD_IP6GRE && 191 t->dev->type != dev_type) 192 continue; 193 194 score = 0; 195 if (t->parms.link != link) 196 score |= 1; 197 if (t->dev->type != dev_type) 198 score |= 2; 199 if (score == 0) 200 return t; 201 202 if (score < cand_score) { 203 cand = t; 204 cand_score = score; 205 } 206 } 207 208 for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) { 209 if (t->parms.i_key != key || 210 !(t->dev->flags & IFF_UP)) 211 continue; 212 213 if (t->dev->type != ARPHRD_IP6GRE && 214 t->dev->type != dev_type) 215 continue; 216 217 score = 0; 218 if (t->parms.link != link) 219 score |= 1; 220 if (t->dev->type != dev_type) 221 score |= 2; 222 if (score == 0) 223 return t; 224 225 if (score < cand_score) { 226 cand = t; 227 cand_score = score; 228 } 229 } 230 231 if (cand) 232 return cand; 233 234 t = rcu_dereference(ign->collect_md_tun); 235 if (t && t->dev->flags & IFF_UP) 236 return t; 237 238 dev = ign->fb_tunnel_dev; 239 if (dev->flags & IFF_UP) 240 return netdev_priv(dev); 241 242 return NULL; 243 } 244 245 static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign, 246 const struct __ip6_tnl_parm *p) 247 { 248 const struct in6_addr *remote = &p->raddr; 249 const struct in6_addr *local = &p->laddr; 250 unsigned int h = HASH_KEY(p->i_key); 251 int prio = 0; 252 253 if (!ipv6_addr_any(local)) 254 prio |= 1; 255 if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) { 256 prio |= 2; 257 h ^= HASH_ADDR(remote); 258 } 259 260 return &ign->tunnels[prio][h]; 261 } 262 263 static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign, 264 const struct ip6_tnl *t) 265 { 266 return __ip6gre_bucket(ign, &t->parms); 267 } 268 269 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t) 270 { 271 struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t); 272 273 if (t->parms.collect_md) 274 rcu_assign_pointer(ign->collect_md_tun, t); 275 276 rcu_assign_pointer(t->next, rtnl_dereference(*tp)); 277 rcu_assign_pointer(*tp, t); 278 } 279 280 static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t) 281 { 282 struct ip6_tnl __rcu **tp; 283 struct ip6_tnl *iter; 284 285 if (t->parms.collect_md) 286 rcu_assign_pointer(ign->collect_md_tun, NULL); 287 288 for (tp = ip6gre_bucket(ign, t); 289 (iter = rtnl_dereference(*tp)) != NULL; 290 tp = &iter->next) { 291 if (t == iter) { 292 rcu_assign_pointer(*tp, t->next); 293 break; 294 } 295 } 296 } 297 298 static struct ip6_tnl *ip6gre_tunnel_find(struct net *net, 299 const struct __ip6_tnl_parm *parms, 300 int type) 301 { 302 const struct in6_addr *remote = &parms->raddr; 303 const struct in6_addr *local = &parms->laddr; 304 __be32 key = parms->i_key; 305 int link = parms->link; 306 struct ip6_tnl *t; 307 struct ip6_tnl __rcu **tp; 308 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 309 310 for (tp = __ip6gre_bucket(ign, parms); 311 (t = rtnl_dereference(*tp)) != NULL; 312 tp = &t->next) 313 if (ipv6_addr_equal(local, &t->parms.laddr) && 314 ipv6_addr_equal(remote, &t->parms.raddr) && 315 key == t->parms.i_key && 316 link == t->parms.link && 317 type == t->dev->type) 318 break; 319 320 return t; 321 } 322 323 static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net, 324 const struct __ip6_tnl_parm *parms, int create) 325 { 326 struct ip6_tnl *t, *nt; 327 struct net_device *dev; 328 char name[IFNAMSIZ]; 329 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 330 331 t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE); 332 if (t && create) 333 return NULL; 334 if (t || !create) 335 return t; 336 337 if (parms->name[0]) 338 strlcpy(name, parms->name, IFNAMSIZ); 339 else 340 strcpy(name, "ip6gre%d"); 341 342 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, 343 ip6gre_tunnel_setup); 344 if (!dev) 345 return NULL; 346 347 dev_net_set(dev, net); 348 349 nt = netdev_priv(dev); 350 nt->parms = *parms; 351 dev->rtnl_link_ops = &ip6gre_link_ops; 352 353 nt->dev = dev; 354 nt->net = dev_net(dev); 355 ip6gre_tnl_link_config(nt, 1); 356 357 if (register_netdevice(dev) < 0) 358 goto failed_free; 359 360 /* Can use a lockless transmit, unless we generate output sequences */ 361 if (!(nt->parms.o_flags & TUNNEL_SEQ)) 362 dev->features |= NETIF_F_LLTX; 363 364 dev_hold(dev); 365 ip6gre_tunnel_link(ign, nt); 366 return nt; 367 368 failed_free: 369 free_netdev(dev); 370 return NULL; 371 } 372 373 static void ip6gre_tunnel_uninit(struct net_device *dev) 374 { 375 struct ip6_tnl *t = netdev_priv(dev); 376 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id); 377 378 ip6gre_tunnel_unlink(ign, t); 379 dst_cache_reset(&t->dst_cache); 380 dev_put(dev); 381 } 382 383 384 static void ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 385 u8 type, u8 code, int offset, __be32 info) 386 { 387 struct net *net = dev_net(skb->dev); 388 const struct gre_base_hdr *greh; 389 const struct ipv6hdr *ipv6h; 390 int grehlen = sizeof(*greh); 391 struct ip6_tnl *t; 392 int key_off = 0; 393 __be16 flags; 394 __be32 key; 395 396 if (!pskb_may_pull(skb, offset + grehlen)) 397 return; 398 greh = (const struct gre_base_hdr *)(skb->data + offset); 399 flags = greh->flags; 400 if (flags & (GRE_VERSION | GRE_ROUTING)) 401 return; 402 if (flags & GRE_CSUM) 403 grehlen += 4; 404 if (flags & GRE_KEY) { 405 key_off = grehlen + offset; 406 grehlen += 4; 407 } 408 409 if (!pskb_may_pull(skb, offset + grehlen)) 410 return; 411 ipv6h = (const struct ipv6hdr *)skb->data; 412 greh = (const struct gre_base_hdr *)(skb->data + offset); 413 key = key_off ? *(__be32 *)(skb->data + key_off) : 0; 414 415 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr, 416 key, greh->protocol); 417 if (!t) 418 return; 419 420 switch (type) { 421 struct ipv6_tlv_tnl_enc_lim *tel; 422 __u32 teli; 423 case ICMPV6_DEST_UNREACH: 424 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n", 425 t->parms.name); 426 if (code != ICMPV6_PORT_UNREACH) 427 break; 428 return; 429 case ICMPV6_TIME_EXCEED: 430 if (code == ICMPV6_EXC_HOPLIMIT) { 431 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n", 432 t->parms.name); 433 break; 434 } 435 return; 436 case ICMPV6_PARAMPROB: 437 teli = 0; 438 if (code == ICMPV6_HDR_FIELD) 439 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data); 440 441 if (teli && teli == be32_to_cpu(info) - 2) { 442 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli]; 443 if (tel->encap_limit == 0) { 444 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n", 445 t->parms.name); 446 } 447 } else { 448 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n", 449 t->parms.name); 450 } 451 return; 452 case ICMPV6_PKT_TOOBIG: 453 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL)); 454 return; 455 case NDISC_REDIRECT: 456 ip6_redirect(skb, net, skb->dev->ifindex, 0, 457 sock_net_uid(net, NULL)); 458 return; 459 } 460 461 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO)) 462 t->err_count++; 463 else 464 t->err_count = 1; 465 t->err_time = jiffies; 466 } 467 468 static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi) 469 { 470 const struct ipv6hdr *ipv6h; 471 struct ip6_tnl *tunnel; 472 473 ipv6h = ipv6_hdr(skb); 474 tunnel = ip6gre_tunnel_lookup(skb->dev, 475 &ipv6h->saddr, &ipv6h->daddr, tpi->key, 476 tpi->proto); 477 if (tunnel) { 478 if (tunnel->parms.collect_md) { 479 struct metadata_dst *tun_dst; 480 __be64 tun_id; 481 __be16 flags; 482 483 flags = tpi->flags; 484 tun_id = key32_to_tunnel_id(tpi->key); 485 486 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id, 0); 487 if (!tun_dst) 488 return PACKET_REJECT; 489 490 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error); 491 } else { 492 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error); 493 } 494 495 return PACKET_RCVD; 496 } 497 498 return PACKET_REJECT; 499 } 500 501 static int ip6erspan_rcv(struct sk_buff *skb, int gre_hdr_len, 502 struct tnl_ptk_info *tpi) 503 { 504 struct erspan_base_hdr *ershdr; 505 struct erspan_metadata *pkt_md; 506 const struct ipv6hdr *ipv6h; 507 struct ip6_tnl *tunnel; 508 u8 ver; 509 510 if (unlikely(!pskb_may_pull(skb, sizeof(*ershdr)))) 511 return PACKET_REJECT; 512 513 ipv6h = ipv6_hdr(skb); 514 ershdr = (struct erspan_base_hdr *)skb->data; 515 ver = (ntohs(ershdr->ver_vlan) & VER_MASK) >> VER_OFFSET; 516 tpi->key = cpu_to_be32(ntohs(ershdr->session_id) & ID_MASK); 517 518 tunnel = ip6gre_tunnel_lookup(skb->dev, 519 &ipv6h->saddr, &ipv6h->daddr, tpi->key, 520 tpi->proto); 521 if (tunnel) { 522 int len = erspan_hdr_len(ver); 523 524 if (unlikely(!pskb_may_pull(skb, len))) 525 return PACKET_REJECT; 526 527 ershdr = (struct erspan_base_hdr *)skb->data; 528 pkt_md = (struct erspan_metadata *)(ershdr + 1); 529 530 if (__iptunnel_pull_header(skb, len, 531 htons(ETH_P_TEB), 532 false, false) < 0) 533 return PACKET_REJECT; 534 535 if (tunnel->parms.collect_md) { 536 struct metadata_dst *tun_dst; 537 struct ip_tunnel_info *info; 538 struct erspan_metadata *md; 539 __be64 tun_id; 540 __be16 flags; 541 542 tpi->flags |= TUNNEL_KEY; 543 flags = tpi->flags; 544 tun_id = key32_to_tunnel_id(tpi->key); 545 546 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id, 547 sizeof(*md)); 548 if (!tun_dst) 549 return PACKET_REJECT; 550 551 info = &tun_dst->u.tun_info; 552 md = ip_tunnel_info_opts(info); 553 554 memcpy(md, pkt_md, sizeof(*md)); 555 md->version = ver; 556 info->key.tun_flags |= TUNNEL_ERSPAN_OPT; 557 info->options_len = sizeof(*md); 558 559 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error); 560 561 } else { 562 tunnel->parms.erspan_ver = ver; 563 564 if (ver == 1) { 565 tunnel->parms.index = ntohl(pkt_md->u.index); 566 } else { 567 u16 md2_flags; 568 u16 dir, hwid; 569 570 md2_flags = ntohs(pkt_md->u.md2.flags); 571 dir = (md2_flags & DIR_MASK) >> DIR_OFFSET; 572 hwid = (md2_flags & HWID_MASK) >> HWID_OFFSET; 573 tunnel->parms.dir = dir; 574 tunnel->parms.hwid = hwid; 575 } 576 577 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error); 578 } 579 580 return PACKET_RCVD; 581 } 582 583 return PACKET_REJECT; 584 } 585 586 static int gre_rcv(struct sk_buff *skb) 587 { 588 struct tnl_ptk_info tpi; 589 bool csum_err = false; 590 int hdr_len; 591 592 hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0); 593 if (hdr_len < 0) 594 goto drop; 595 596 if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false)) 597 goto drop; 598 599 if (unlikely(tpi.proto == htons(ETH_P_ERSPAN) || 600 tpi.proto == htons(ETH_P_ERSPAN2))) { 601 if (ip6erspan_rcv(skb, hdr_len, &tpi) == PACKET_RCVD) 602 return 0; 603 goto out; 604 } 605 606 if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD) 607 return 0; 608 609 out: 610 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); 611 drop: 612 kfree_skb(skb); 613 return 0; 614 } 615 616 static int gre_handle_offloads(struct sk_buff *skb, bool csum) 617 { 618 return iptunnel_handle_offloads(skb, 619 csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE); 620 } 621 622 static void prepare_ip6gre_xmit_ipv4(struct sk_buff *skb, 623 struct net_device *dev, 624 struct flowi6 *fl6, __u8 *dsfield, 625 int *encap_limit) 626 { 627 const struct iphdr *iph = ip_hdr(skb); 628 struct ip6_tnl *t = netdev_priv(dev); 629 630 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 631 *encap_limit = t->parms.encap_limit; 632 633 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6)); 634 635 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) 636 *dsfield = ipv4_get_dsfield(iph); 637 else 638 *dsfield = ip6_tclass(t->parms.flowinfo); 639 640 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) 641 fl6->flowi6_mark = skb->mark; 642 else 643 fl6->flowi6_mark = t->parms.fwmark; 644 645 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL); 646 } 647 648 static int prepare_ip6gre_xmit_ipv6(struct sk_buff *skb, 649 struct net_device *dev, 650 struct flowi6 *fl6, __u8 *dsfield, 651 int *encap_limit) 652 { 653 struct ipv6hdr *ipv6h = ipv6_hdr(skb); 654 struct ip6_tnl *t = netdev_priv(dev); 655 __u16 offset; 656 657 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb)); 658 /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */ 659 660 if (offset > 0) { 661 struct ipv6_tlv_tnl_enc_lim *tel; 662 663 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset]; 664 if (tel->encap_limit == 0) { 665 icmpv6_send(skb, ICMPV6_PARAMPROB, 666 ICMPV6_HDR_FIELD, offset + 2); 667 return -1; 668 } 669 *encap_limit = tel->encap_limit - 1; 670 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) { 671 *encap_limit = t->parms.encap_limit; 672 } 673 674 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6)); 675 676 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) 677 *dsfield = ipv6_get_dsfield(ipv6h); 678 else 679 *dsfield = ip6_tclass(t->parms.flowinfo); 680 681 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL) 682 fl6->flowlabel |= ip6_flowlabel(ipv6h); 683 684 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) 685 fl6->flowi6_mark = skb->mark; 686 else 687 fl6->flowi6_mark = t->parms.fwmark; 688 689 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL); 690 691 return 0; 692 } 693 694 static netdev_tx_t __gre6_xmit(struct sk_buff *skb, 695 struct net_device *dev, __u8 dsfield, 696 struct flowi6 *fl6, int encap_limit, 697 __u32 *pmtu, __be16 proto) 698 { 699 struct ip6_tnl *tunnel = netdev_priv(dev); 700 __be16 protocol; 701 702 if (dev->type == ARPHRD_ETHER) 703 IPCB(skb)->flags = 0; 704 705 if (dev->header_ops && dev->type == ARPHRD_IP6GRE) 706 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr; 707 else 708 fl6->daddr = tunnel->parms.raddr; 709 710 if (tunnel->parms.o_flags & TUNNEL_SEQ) 711 tunnel->o_seqno++; 712 713 /* Push GRE header. */ 714 protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto; 715 716 if (tunnel->parms.collect_md) { 717 struct ip_tunnel_info *tun_info; 718 const struct ip_tunnel_key *key; 719 __be16 flags; 720 721 tun_info = skb_tunnel_info(skb); 722 if (unlikely(!tun_info || 723 !(tun_info->mode & IP_TUNNEL_INFO_TX) || 724 ip_tunnel_info_af(tun_info) != AF_INET6)) 725 return -EINVAL; 726 727 key = &tun_info->key; 728 memset(fl6, 0, sizeof(*fl6)); 729 fl6->flowi6_proto = IPPROTO_GRE; 730 fl6->daddr = key->u.ipv6.dst; 731 fl6->flowlabel = key->label; 732 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL); 733 734 dsfield = key->tos; 735 flags = key->tun_flags & (TUNNEL_CSUM | TUNNEL_KEY); 736 tunnel->tun_hlen = gre_calc_hlen(flags); 737 738 gre_build_header(skb, tunnel->tun_hlen, 739 flags, protocol, 740 tunnel_id_to_key32(tun_info->key.tun_id), 0); 741 742 } else { 743 gre_build_header(skb, tunnel->tun_hlen, tunnel->parms.o_flags, 744 protocol, tunnel->parms.o_key, 745 htonl(tunnel->o_seqno)); 746 } 747 748 return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu, 749 NEXTHDR_GRE); 750 } 751 752 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev) 753 { 754 struct ip6_tnl *t = netdev_priv(dev); 755 int encap_limit = -1; 756 struct flowi6 fl6; 757 __u8 dsfield = 0; 758 __u32 mtu; 759 int err; 760 761 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); 762 763 if (!t->parms.collect_md) 764 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6, 765 &dsfield, &encap_limit); 766 767 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)); 768 if (err) 769 return -1; 770 771 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, 772 skb->protocol); 773 if (err != 0) { 774 /* XXX: send ICMP error even if DF is not set. */ 775 if (err == -EMSGSIZE) 776 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, 777 htonl(mtu)); 778 return -1; 779 } 780 781 return 0; 782 } 783 784 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev) 785 { 786 struct ip6_tnl *t = netdev_priv(dev); 787 struct ipv6hdr *ipv6h = ipv6_hdr(skb); 788 int encap_limit = -1; 789 struct flowi6 fl6; 790 __u8 dsfield = 0; 791 __u32 mtu; 792 int err; 793 794 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr)) 795 return -1; 796 797 if (!t->parms.collect_md && 798 prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, &dsfield, &encap_limit)) 799 return -1; 800 801 if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM))) 802 return -1; 803 804 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, 805 &mtu, skb->protocol); 806 if (err != 0) { 807 if (err == -EMSGSIZE) 808 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 809 return -1; 810 } 811 812 return 0; 813 } 814 815 /** 816 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own 817 * @t: the outgoing tunnel device 818 * @hdr: IPv6 header from the incoming packet 819 * 820 * Description: 821 * Avoid trivial tunneling loop by checking that tunnel exit-point 822 * doesn't match source of incoming packet. 823 * 824 * Return: 825 * 1 if conflict, 826 * 0 else 827 **/ 828 829 static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t, 830 const struct ipv6hdr *hdr) 831 { 832 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); 833 } 834 835 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev) 836 { 837 struct ip6_tnl *t = netdev_priv(dev); 838 int encap_limit = -1; 839 struct flowi6 fl6; 840 __u32 mtu; 841 int err; 842 843 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 844 encap_limit = t->parms.encap_limit; 845 846 if (!t->parms.collect_md) 847 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); 848 849 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)); 850 if (err) 851 return err; 852 853 err = __gre6_xmit(skb, dev, 0, &fl6, encap_limit, &mtu, skb->protocol); 854 855 return err; 856 } 857 858 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb, 859 struct net_device *dev) 860 { 861 struct ip6_tnl *t = netdev_priv(dev); 862 struct net_device_stats *stats = &t->dev->stats; 863 int ret; 864 865 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr)) 866 goto tx_err; 867 868 switch (skb->protocol) { 869 case htons(ETH_P_IP): 870 ret = ip6gre_xmit_ipv4(skb, dev); 871 break; 872 case htons(ETH_P_IPV6): 873 ret = ip6gre_xmit_ipv6(skb, dev); 874 break; 875 default: 876 ret = ip6gre_xmit_other(skb, dev); 877 break; 878 } 879 880 if (ret < 0) 881 goto tx_err; 882 883 return NETDEV_TX_OK; 884 885 tx_err: 886 stats->tx_errors++; 887 stats->tx_dropped++; 888 kfree_skb(skb); 889 return NETDEV_TX_OK; 890 } 891 892 static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb, 893 struct net_device *dev) 894 { 895 struct ipv6hdr *ipv6h = ipv6_hdr(skb); 896 struct ip6_tnl *t = netdev_priv(dev); 897 struct dst_entry *dst = skb_dst(skb); 898 struct net_device_stats *stats; 899 bool truncate = false; 900 int encap_limit = -1; 901 __u8 dsfield = false; 902 struct flowi6 fl6; 903 int err = -EINVAL; 904 __u32 mtu; 905 906 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr)) 907 goto tx_err; 908 909 if (gre_handle_offloads(skb, false)) 910 goto tx_err; 911 912 if (skb->len > dev->mtu + dev->hard_header_len) { 913 pskb_trim(skb, dev->mtu + dev->hard_header_len); 914 truncate = true; 915 } 916 917 t->parms.o_flags &= ~TUNNEL_KEY; 918 IPCB(skb)->flags = 0; 919 920 /* For collect_md mode, derive fl6 from the tunnel key, 921 * for native mode, call prepare_ip6gre_xmit_{ipv4,ipv6}. 922 */ 923 if (t->parms.collect_md) { 924 struct ip_tunnel_info *tun_info; 925 const struct ip_tunnel_key *key; 926 struct erspan_metadata *md; 927 928 tun_info = skb_tunnel_info(skb); 929 if (unlikely(!tun_info || 930 !(tun_info->mode & IP_TUNNEL_INFO_TX) || 931 ip_tunnel_info_af(tun_info) != AF_INET6)) 932 return -EINVAL; 933 934 key = &tun_info->key; 935 memset(&fl6, 0, sizeof(fl6)); 936 fl6.flowi6_proto = IPPROTO_GRE; 937 fl6.daddr = key->u.ipv6.dst; 938 fl6.flowlabel = key->label; 939 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL); 940 941 dsfield = key->tos; 942 md = ip_tunnel_info_opts(tun_info); 943 if (!md) 944 goto tx_err; 945 946 if (md->version == 1) { 947 erspan_build_header(skb, 948 tunnel_id_to_key32(key->tun_id), 949 ntohl(md->u.index), truncate, 950 false); 951 } else if (md->version == 2) { 952 u16 md2_flags; 953 u16 dir, hwid; 954 955 md2_flags = ntohs(md->u.md2.flags); 956 dir = (md2_flags & DIR_MASK) >> DIR_OFFSET; 957 hwid = (md2_flags & HWID_MASK) >> HWID_OFFSET; 958 959 erspan_build_header_v2(skb, 960 tunnel_id_to_key32(key->tun_id), 961 dir, hwid, truncate, 962 false); 963 } 964 } else { 965 switch (skb->protocol) { 966 case htons(ETH_P_IP): 967 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); 968 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6, 969 &dsfield, &encap_limit); 970 break; 971 case htons(ETH_P_IPV6): 972 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr)) 973 goto tx_err; 974 if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, 975 &dsfield, &encap_limit)) 976 goto tx_err; 977 break; 978 default: 979 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); 980 break; 981 } 982 983 if (t->parms.erspan_ver == 1) 984 erspan_build_header(skb, t->parms.o_key, 985 t->parms.index, 986 truncate, false); 987 else 988 erspan_build_header_v2(skb, t->parms.o_key, 989 t->parms.dir, 990 t->parms.hwid, 991 truncate, false); 992 fl6.daddr = t->parms.raddr; 993 } 994 995 /* Push GRE header. */ 996 gre_build_header(skb, 8, TUNNEL_SEQ, 997 htons(ETH_P_ERSPAN), 0, htonl(t->o_seqno++)); 998 999 /* TooBig packet may have updated dst->dev's mtu */ 1000 if (!t->parms.collect_md && dst && dst_mtu(dst) > dst->dev->mtu) 1001 dst->ops->update_pmtu(dst, NULL, skb, dst->dev->mtu); 1002 1003 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, 1004 NEXTHDR_GRE); 1005 if (err != 0) { 1006 /* XXX: send ICMP error even if DF is not set. */ 1007 if (err == -EMSGSIZE) { 1008 if (skb->protocol == htons(ETH_P_IP)) 1009 icmp_send(skb, ICMP_DEST_UNREACH, 1010 ICMP_FRAG_NEEDED, htonl(mtu)); 1011 else 1012 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 1013 } 1014 1015 goto tx_err; 1016 } 1017 return NETDEV_TX_OK; 1018 1019 tx_err: 1020 stats = &t->dev->stats; 1021 stats->tx_errors++; 1022 stats->tx_dropped++; 1023 kfree_skb(skb); 1024 return NETDEV_TX_OK; 1025 } 1026 1027 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu) 1028 { 1029 struct net_device *dev = t->dev; 1030 struct __ip6_tnl_parm *p = &t->parms; 1031 struct flowi6 *fl6 = &t->fl.u.ip6; 1032 int t_hlen; 1033 1034 if (dev->type != ARPHRD_ETHER) { 1035 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); 1036 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); 1037 } 1038 1039 /* Set up flowi template */ 1040 fl6->saddr = p->laddr; 1041 fl6->daddr = p->raddr; 1042 fl6->flowi6_oif = p->link; 1043 fl6->flowlabel = 0; 1044 fl6->flowi6_proto = IPPROTO_GRE; 1045 1046 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) 1047 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; 1048 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) 1049 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; 1050 1051 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET); 1052 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr); 1053 1054 if (p->flags&IP6_TNL_F_CAP_XMIT && 1055 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER) 1056 dev->flags |= IFF_POINTOPOINT; 1057 else 1058 dev->flags &= ~IFF_POINTOPOINT; 1059 1060 t->tun_hlen = gre_calc_hlen(t->parms.o_flags); 1061 1062 t->hlen = t->encap_hlen + t->tun_hlen; 1063 1064 t_hlen = t->hlen + sizeof(struct ipv6hdr); 1065 1066 if (p->flags & IP6_TNL_F_CAP_XMIT) { 1067 int strict = (ipv6_addr_type(&p->raddr) & 1068 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); 1069 1070 struct rt6_info *rt = rt6_lookup(t->net, 1071 &p->raddr, &p->laddr, 1072 p->link, strict); 1073 1074 if (!rt) 1075 return; 1076 1077 if (rt->dst.dev) { 1078 dev->hard_header_len = rt->dst.dev->hard_header_len + 1079 t_hlen; 1080 1081 if (set_mtu) { 1082 dev->mtu = rt->dst.dev->mtu - t_hlen; 1083 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1084 dev->mtu -= 8; 1085 if (dev->type == ARPHRD_ETHER) 1086 dev->mtu -= ETH_HLEN; 1087 1088 if (dev->mtu < IPV6_MIN_MTU) 1089 dev->mtu = IPV6_MIN_MTU; 1090 } 1091 } 1092 ip6_rt_put(rt); 1093 } 1094 } 1095 1096 static int ip6gre_tnl_change(struct ip6_tnl *t, 1097 const struct __ip6_tnl_parm *p, int set_mtu) 1098 { 1099 t->parms.laddr = p->laddr; 1100 t->parms.raddr = p->raddr; 1101 t->parms.flags = p->flags; 1102 t->parms.hop_limit = p->hop_limit; 1103 t->parms.encap_limit = p->encap_limit; 1104 t->parms.flowinfo = p->flowinfo; 1105 t->parms.link = p->link; 1106 t->parms.proto = p->proto; 1107 t->parms.i_key = p->i_key; 1108 t->parms.o_key = p->o_key; 1109 t->parms.i_flags = p->i_flags; 1110 t->parms.o_flags = p->o_flags; 1111 t->parms.fwmark = p->fwmark; 1112 dst_cache_reset(&t->dst_cache); 1113 ip6gre_tnl_link_config(t, set_mtu); 1114 return 0; 1115 } 1116 1117 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p, 1118 const struct ip6_tnl_parm2 *u) 1119 { 1120 p->laddr = u->laddr; 1121 p->raddr = u->raddr; 1122 p->flags = u->flags; 1123 p->hop_limit = u->hop_limit; 1124 p->encap_limit = u->encap_limit; 1125 p->flowinfo = u->flowinfo; 1126 p->link = u->link; 1127 p->i_key = u->i_key; 1128 p->o_key = u->o_key; 1129 p->i_flags = gre_flags_to_tnl_flags(u->i_flags); 1130 p->o_flags = gre_flags_to_tnl_flags(u->o_flags); 1131 memcpy(p->name, u->name, sizeof(u->name)); 1132 } 1133 1134 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u, 1135 const struct __ip6_tnl_parm *p) 1136 { 1137 u->proto = IPPROTO_GRE; 1138 u->laddr = p->laddr; 1139 u->raddr = p->raddr; 1140 u->flags = p->flags; 1141 u->hop_limit = p->hop_limit; 1142 u->encap_limit = p->encap_limit; 1143 u->flowinfo = p->flowinfo; 1144 u->link = p->link; 1145 u->i_key = p->i_key; 1146 u->o_key = p->o_key; 1147 u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags); 1148 u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags); 1149 memcpy(u->name, p->name, sizeof(u->name)); 1150 } 1151 1152 static int ip6gre_tunnel_ioctl(struct net_device *dev, 1153 struct ifreq *ifr, int cmd) 1154 { 1155 int err = 0; 1156 struct ip6_tnl_parm2 p; 1157 struct __ip6_tnl_parm p1; 1158 struct ip6_tnl *t = netdev_priv(dev); 1159 struct net *net = t->net; 1160 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1161 1162 memset(&p1, 0, sizeof(p1)); 1163 1164 switch (cmd) { 1165 case SIOCGETTUNNEL: 1166 if (dev == ign->fb_tunnel_dev) { 1167 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { 1168 err = -EFAULT; 1169 break; 1170 } 1171 ip6gre_tnl_parm_from_user(&p1, &p); 1172 t = ip6gre_tunnel_locate(net, &p1, 0); 1173 if (!t) 1174 t = netdev_priv(dev); 1175 } 1176 memset(&p, 0, sizeof(p)); 1177 ip6gre_tnl_parm_to_user(&p, &t->parms); 1178 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) 1179 err = -EFAULT; 1180 break; 1181 1182 case SIOCADDTUNNEL: 1183 case SIOCCHGTUNNEL: 1184 err = -EPERM; 1185 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1186 goto done; 1187 1188 err = -EFAULT; 1189 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 1190 goto done; 1191 1192 err = -EINVAL; 1193 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING)) 1194 goto done; 1195 1196 if (!(p.i_flags&GRE_KEY)) 1197 p.i_key = 0; 1198 if (!(p.o_flags&GRE_KEY)) 1199 p.o_key = 0; 1200 1201 ip6gre_tnl_parm_from_user(&p1, &p); 1202 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL); 1203 1204 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { 1205 if (t) { 1206 if (t->dev != dev) { 1207 err = -EEXIST; 1208 break; 1209 } 1210 } else { 1211 t = netdev_priv(dev); 1212 1213 ip6gre_tunnel_unlink(ign, t); 1214 synchronize_net(); 1215 ip6gre_tnl_change(t, &p1, 1); 1216 ip6gre_tunnel_link(ign, t); 1217 netdev_state_change(dev); 1218 } 1219 } 1220 1221 if (t) { 1222 err = 0; 1223 1224 memset(&p, 0, sizeof(p)); 1225 ip6gre_tnl_parm_to_user(&p, &t->parms); 1226 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) 1227 err = -EFAULT; 1228 } else 1229 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); 1230 break; 1231 1232 case SIOCDELTUNNEL: 1233 err = -EPERM; 1234 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1235 goto done; 1236 1237 if (dev == ign->fb_tunnel_dev) { 1238 err = -EFAULT; 1239 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 1240 goto done; 1241 err = -ENOENT; 1242 ip6gre_tnl_parm_from_user(&p1, &p); 1243 t = ip6gre_tunnel_locate(net, &p1, 0); 1244 if (!t) 1245 goto done; 1246 err = -EPERM; 1247 if (t == netdev_priv(ign->fb_tunnel_dev)) 1248 goto done; 1249 dev = t->dev; 1250 } 1251 unregister_netdevice(dev); 1252 err = 0; 1253 break; 1254 1255 default: 1256 err = -EINVAL; 1257 } 1258 1259 done: 1260 return err; 1261 } 1262 1263 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev, 1264 unsigned short type, const void *daddr, 1265 const void *saddr, unsigned int len) 1266 { 1267 struct ip6_tnl *t = netdev_priv(dev); 1268 struct ipv6hdr *ipv6h; 1269 __be16 *p; 1270 1271 ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h)); 1272 ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb, 1273 t->fl.u.ip6.flowlabel, 1274 true, &t->fl.u.ip6)); 1275 ipv6h->hop_limit = t->parms.hop_limit; 1276 ipv6h->nexthdr = NEXTHDR_GRE; 1277 ipv6h->saddr = t->parms.laddr; 1278 ipv6h->daddr = t->parms.raddr; 1279 1280 p = (__be16 *)(ipv6h + 1); 1281 p[0] = t->parms.o_flags; 1282 p[1] = htons(type); 1283 1284 /* 1285 * Set the source hardware address. 1286 */ 1287 1288 if (saddr) 1289 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr)); 1290 if (daddr) 1291 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr)); 1292 if (!ipv6_addr_any(&ipv6h->daddr)) 1293 return t->hlen; 1294 1295 return -t->hlen; 1296 } 1297 1298 static const struct header_ops ip6gre_header_ops = { 1299 .create = ip6gre_header, 1300 }; 1301 1302 static const struct net_device_ops ip6gre_netdev_ops = { 1303 .ndo_init = ip6gre_tunnel_init, 1304 .ndo_uninit = ip6gre_tunnel_uninit, 1305 .ndo_start_xmit = ip6gre_tunnel_xmit, 1306 .ndo_do_ioctl = ip6gre_tunnel_ioctl, 1307 .ndo_change_mtu = ip6_tnl_change_mtu, 1308 .ndo_get_stats64 = ip_tunnel_get_stats64, 1309 .ndo_get_iflink = ip6_tnl_get_iflink, 1310 }; 1311 1312 static void ip6gre_dev_free(struct net_device *dev) 1313 { 1314 struct ip6_tnl *t = netdev_priv(dev); 1315 1316 dst_cache_destroy(&t->dst_cache); 1317 free_percpu(dev->tstats); 1318 } 1319 1320 static void ip6gre_tunnel_setup(struct net_device *dev) 1321 { 1322 dev->netdev_ops = &ip6gre_netdev_ops; 1323 dev->needs_free_netdev = true; 1324 dev->priv_destructor = ip6gre_dev_free; 1325 1326 dev->type = ARPHRD_IP6GRE; 1327 1328 dev->flags |= IFF_NOARP; 1329 dev->addr_len = sizeof(struct in6_addr); 1330 netif_keep_dst(dev); 1331 /* This perm addr will be used as interface identifier by IPv6 */ 1332 dev->addr_assign_type = NET_ADDR_RANDOM; 1333 eth_random_addr(dev->perm_addr); 1334 } 1335 1336 #define GRE6_FEATURES (NETIF_F_SG | \ 1337 NETIF_F_FRAGLIST | \ 1338 NETIF_F_HIGHDMA | \ 1339 NETIF_F_HW_CSUM) 1340 1341 static void ip6gre_tnl_init_features(struct net_device *dev) 1342 { 1343 struct ip6_tnl *nt = netdev_priv(dev); 1344 1345 dev->features |= GRE6_FEATURES; 1346 dev->hw_features |= GRE6_FEATURES; 1347 1348 if (!(nt->parms.o_flags & TUNNEL_SEQ)) { 1349 /* TCP offload with GRE SEQ is not supported, nor 1350 * can we support 2 levels of outer headers requiring 1351 * an update. 1352 */ 1353 if (!(nt->parms.o_flags & TUNNEL_CSUM) || 1354 nt->encap.type == TUNNEL_ENCAP_NONE) { 1355 dev->features |= NETIF_F_GSO_SOFTWARE; 1356 dev->hw_features |= NETIF_F_GSO_SOFTWARE; 1357 } 1358 1359 /* Can use a lockless transmit, unless we generate 1360 * output sequences 1361 */ 1362 dev->features |= NETIF_F_LLTX; 1363 } 1364 } 1365 1366 static int ip6gre_tunnel_init_common(struct net_device *dev) 1367 { 1368 struct ip6_tnl *tunnel; 1369 int ret; 1370 int t_hlen; 1371 1372 tunnel = netdev_priv(dev); 1373 1374 tunnel->dev = dev; 1375 tunnel->net = dev_net(dev); 1376 strcpy(tunnel->parms.name, dev->name); 1377 1378 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 1379 if (!dev->tstats) 1380 return -ENOMEM; 1381 1382 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); 1383 if (ret) { 1384 free_percpu(dev->tstats); 1385 dev->tstats = NULL; 1386 return ret; 1387 } 1388 1389 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags); 1390 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen; 1391 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr); 1392 1393 dev->hard_header_len = LL_MAX_HEADER + t_hlen; 1394 dev->mtu = ETH_DATA_LEN - t_hlen; 1395 if (dev->type == ARPHRD_ETHER) 1396 dev->mtu -= ETH_HLEN; 1397 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1398 dev->mtu -= 8; 1399 1400 if (tunnel->parms.collect_md) { 1401 dev->features |= NETIF_F_NETNS_LOCAL; 1402 netif_keep_dst(dev); 1403 } 1404 ip6gre_tnl_init_features(dev); 1405 1406 return 0; 1407 } 1408 1409 static int ip6gre_tunnel_init(struct net_device *dev) 1410 { 1411 struct ip6_tnl *tunnel; 1412 int ret; 1413 1414 ret = ip6gre_tunnel_init_common(dev); 1415 if (ret) 1416 return ret; 1417 1418 tunnel = netdev_priv(dev); 1419 1420 if (tunnel->parms.collect_md) 1421 return 0; 1422 1423 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr)); 1424 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr)); 1425 1426 if (ipv6_addr_any(&tunnel->parms.raddr)) 1427 dev->header_ops = &ip6gre_header_ops; 1428 1429 return 0; 1430 } 1431 1432 static void ip6gre_fb_tunnel_init(struct net_device *dev) 1433 { 1434 struct ip6_tnl *tunnel = netdev_priv(dev); 1435 1436 tunnel->dev = dev; 1437 tunnel->net = dev_net(dev); 1438 strcpy(tunnel->parms.name, dev->name); 1439 1440 tunnel->hlen = sizeof(struct ipv6hdr) + 4; 1441 1442 dev_hold(dev); 1443 } 1444 1445 static struct inet6_protocol ip6gre_protocol __read_mostly = { 1446 .handler = gre_rcv, 1447 .err_handler = ip6gre_err, 1448 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 1449 }; 1450 1451 static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head) 1452 { 1453 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1454 struct net_device *dev, *aux; 1455 int prio; 1456 1457 for_each_netdev_safe(net, dev, aux) 1458 if (dev->rtnl_link_ops == &ip6gre_link_ops || 1459 dev->rtnl_link_ops == &ip6gre_tap_ops || 1460 dev->rtnl_link_ops == &ip6erspan_tap_ops) 1461 unregister_netdevice_queue(dev, head); 1462 1463 for (prio = 0; prio < 4; prio++) { 1464 int h; 1465 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) { 1466 struct ip6_tnl *t; 1467 1468 t = rtnl_dereference(ign->tunnels[prio][h]); 1469 1470 while (t) { 1471 /* If dev is in the same netns, it has already 1472 * been added to the list by the previous loop. 1473 */ 1474 if (!net_eq(dev_net(t->dev), net)) 1475 unregister_netdevice_queue(t->dev, 1476 head); 1477 t = rtnl_dereference(t->next); 1478 } 1479 } 1480 } 1481 } 1482 1483 static int __net_init ip6gre_init_net(struct net *net) 1484 { 1485 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1486 int err; 1487 1488 ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0", 1489 NET_NAME_UNKNOWN, 1490 ip6gre_tunnel_setup); 1491 if (!ign->fb_tunnel_dev) { 1492 err = -ENOMEM; 1493 goto err_alloc_dev; 1494 } 1495 dev_net_set(ign->fb_tunnel_dev, net); 1496 /* FB netdevice is special: we have one, and only one per netns. 1497 * Allowing to move it to another netns is clearly unsafe. 1498 */ 1499 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL; 1500 1501 1502 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev); 1503 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops; 1504 1505 err = register_netdev(ign->fb_tunnel_dev); 1506 if (err) 1507 goto err_reg_dev; 1508 1509 rcu_assign_pointer(ign->tunnels_wc[0], 1510 netdev_priv(ign->fb_tunnel_dev)); 1511 return 0; 1512 1513 err_reg_dev: 1514 free_netdev(ign->fb_tunnel_dev); 1515 err_alloc_dev: 1516 return err; 1517 } 1518 1519 static void __net_exit ip6gre_exit_batch_net(struct list_head *net_list) 1520 { 1521 struct net *net; 1522 LIST_HEAD(list); 1523 1524 rtnl_lock(); 1525 list_for_each_entry(net, net_list, exit_list) 1526 ip6gre_destroy_tunnels(net, &list); 1527 unregister_netdevice_many(&list); 1528 rtnl_unlock(); 1529 } 1530 1531 static struct pernet_operations ip6gre_net_ops = { 1532 .init = ip6gre_init_net, 1533 .exit_batch = ip6gre_exit_batch_net, 1534 .id = &ip6gre_net_id, 1535 .size = sizeof(struct ip6gre_net), 1536 }; 1537 1538 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[], 1539 struct netlink_ext_ack *extack) 1540 { 1541 __be16 flags; 1542 1543 if (!data) 1544 return 0; 1545 1546 flags = 0; 1547 if (data[IFLA_GRE_IFLAGS]) 1548 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); 1549 if (data[IFLA_GRE_OFLAGS]) 1550 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); 1551 if (flags & (GRE_VERSION|GRE_ROUTING)) 1552 return -EINVAL; 1553 1554 return 0; 1555 } 1556 1557 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[], 1558 struct netlink_ext_ack *extack) 1559 { 1560 struct in6_addr daddr; 1561 1562 if (tb[IFLA_ADDRESS]) { 1563 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 1564 return -EINVAL; 1565 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 1566 return -EADDRNOTAVAIL; 1567 } 1568 1569 if (!data) 1570 goto out; 1571 1572 if (data[IFLA_GRE_REMOTE]) { 1573 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]); 1574 if (ipv6_addr_any(&daddr)) 1575 return -EINVAL; 1576 } 1577 1578 out: 1579 return ip6gre_tunnel_validate(tb, data, extack); 1580 } 1581 1582 static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[], 1583 struct netlink_ext_ack *extack) 1584 { 1585 __be16 flags = 0; 1586 int ret, ver = 0; 1587 1588 if (!data) 1589 return 0; 1590 1591 ret = ip6gre_tap_validate(tb, data, extack); 1592 if (ret) 1593 return ret; 1594 1595 /* ERSPAN should only have GRE sequence and key flag */ 1596 if (data[IFLA_GRE_OFLAGS]) 1597 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); 1598 if (data[IFLA_GRE_IFLAGS]) 1599 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); 1600 if (!data[IFLA_GRE_COLLECT_METADATA] && 1601 flags != (GRE_SEQ | GRE_KEY)) 1602 return -EINVAL; 1603 1604 /* ERSPAN Session ID only has 10-bit. Since we reuse 1605 * 32-bit key field as ID, check it's range. 1606 */ 1607 if (data[IFLA_GRE_IKEY] && 1608 (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK)) 1609 return -EINVAL; 1610 1611 if (data[IFLA_GRE_OKEY] && 1612 (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK)) 1613 return -EINVAL; 1614 1615 if (data[IFLA_GRE_ERSPAN_VER]) { 1616 ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]); 1617 if (ver != 1 && ver != 2) 1618 return -EINVAL; 1619 } 1620 1621 if (ver == 1) { 1622 if (data[IFLA_GRE_ERSPAN_INDEX]) { 1623 u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]); 1624 1625 if (index & ~INDEX_MASK) 1626 return -EINVAL; 1627 } 1628 } else if (ver == 2) { 1629 if (data[IFLA_GRE_ERSPAN_DIR]) { 1630 u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]); 1631 1632 if (dir & ~(DIR_MASK >> DIR_OFFSET)) 1633 return -EINVAL; 1634 } 1635 1636 if (data[IFLA_GRE_ERSPAN_HWID]) { 1637 u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]); 1638 1639 if (hwid & ~(HWID_MASK >> HWID_OFFSET)) 1640 return -EINVAL; 1641 } 1642 } 1643 1644 return 0; 1645 } 1646 1647 static void ip6gre_netlink_parms(struct nlattr *data[], 1648 struct __ip6_tnl_parm *parms) 1649 { 1650 memset(parms, 0, sizeof(*parms)); 1651 1652 if (!data) 1653 return; 1654 1655 if (data[IFLA_GRE_LINK]) 1656 parms->link = nla_get_u32(data[IFLA_GRE_LINK]); 1657 1658 if (data[IFLA_GRE_IFLAGS]) 1659 parms->i_flags = gre_flags_to_tnl_flags( 1660 nla_get_be16(data[IFLA_GRE_IFLAGS])); 1661 1662 if (data[IFLA_GRE_OFLAGS]) 1663 parms->o_flags = gre_flags_to_tnl_flags( 1664 nla_get_be16(data[IFLA_GRE_OFLAGS])); 1665 1666 if (data[IFLA_GRE_IKEY]) 1667 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]); 1668 1669 if (data[IFLA_GRE_OKEY]) 1670 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]); 1671 1672 if (data[IFLA_GRE_LOCAL]) 1673 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]); 1674 1675 if (data[IFLA_GRE_REMOTE]) 1676 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]); 1677 1678 if (data[IFLA_GRE_TTL]) 1679 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]); 1680 1681 if (data[IFLA_GRE_ENCAP_LIMIT]) 1682 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]); 1683 1684 if (data[IFLA_GRE_FLOWINFO]) 1685 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]); 1686 1687 if (data[IFLA_GRE_FLAGS]) 1688 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]); 1689 1690 if (data[IFLA_GRE_FWMARK]) 1691 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]); 1692 1693 if (data[IFLA_GRE_COLLECT_METADATA]) 1694 parms->collect_md = true; 1695 1696 if (data[IFLA_GRE_ERSPAN_VER]) 1697 parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]); 1698 1699 if (parms->erspan_ver == 1) { 1700 if (data[IFLA_GRE_ERSPAN_INDEX]) 1701 parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]); 1702 } else if (parms->erspan_ver == 2) { 1703 if (data[IFLA_GRE_ERSPAN_DIR]) 1704 parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]); 1705 if (data[IFLA_GRE_ERSPAN_HWID]) 1706 parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]); 1707 } 1708 } 1709 1710 static int ip6gre_tap_init(struct net_device *dev) 1711 { 1712 struct ip6_tnl *tunnel; 1713 int ret; 1714 1715 ret = ip6gre_tunnel_init_common(dev); 1716 if (ret) 1717 return ret; 1718 1719 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 1720 1721 tunnel = netdev_priv(dev); 1722 1723 ip6gre_tnl_link_config(tunnel, 1); 1724 1725 return 0; 1726 } 1727 1728 static const struct net_device_ops ip6gre_tap_netdev_ops = { 1729 .ndo_init = ip6gre_tap_init, 1730 .ndo_uninit = ip6gre_tunnel_uninit, 1731 .ndo_start_xmit = ip6gre_tunnel_xmit, 1732 .ndo_set_mac_address = eth_mac_addr, 1733 .ndo_validate_addr = eth_validate_addr, 1734 .ndo_change_mtu = ip6_tnl_change_mtu, 1735 .ndo_get_stats64 = ip_tunnel_get_stats64, 1736 .ndo_get_iflink = ip6_tnl_get_iflink, 1737 }; 1738 1739 static int ip6erspan_tap_init(struct net_device *dev) 1740 { 1741 struct ip6_tnl *tunnel; 1742 int t_hlen; 1743 int ret; 1744 1745 tunnel = netdev_priv(dev); 1746 1747 tunnel->dev = dev; 1748 tunnel->net = dev_net(dev); 1749 strcpy(tunnel->parms.name, dev->name); 1750 1751 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 1752 if (!dev->tstats) 1753 return -ENOMEM; 1754 1755 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); 1756 if (ret) { 1757 free_percpu(dev->tstats); 1758 dev->tstats = NULL; 1759 return ret; 1760 } 1761 1762 tunnel->tun_hlen = 8; 1763 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen + 1764 erspan_hdr_len(tunnel->parms.erspan_ver); 1765 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr); 1766 1767 dev->hard_header_len = LL_MAX_HEADER + t_hlen; 1768 dev->mtu = ETH_DATA_LEN - t_hlen; 1769 if (dev->type == ARPHRD_ETHER) 1770 dev->mtu -= ETH_HLEN; 1771 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1772 dev->mtu -= 8; 1773 1774 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 1775 tunnel = netdev_priv(dev); 1776 ip6gre_tnl_link_config(tunnel, 1); 1777 1778 return 0; 1779 } 1780 1781 static const struct net_device_ops ip6erspan_netdev_ops = { 1782 .ndo_init = ip6erspan_tap_init, 1783 .ndo_uninit = ip6gre_tunnel_uninit, 1784 .ndo_start_xmit = ip6erspan_tunnel_xmit, 1785 .ndo_set_mac_address = eth_mac_addr, 1786 .ndo_validate_addr = eth_validate_addr, 1787 .ndo_change_mtu = ip6_tnl_change_mtu, 1788 .ndo_get_stats64 = ip_tunnel_get_stats64, 1789 .ndo_get_iflink = ip6_tnl_get_iflink, 1790 }; 1791 1792 static void ip6gre_tap_setup(struct net_device *dev) 1793 { 1794 1795 ether_setup(dev); 1796 1797 dev->max_mtu = 0; 1798 dev->netdev_ops = &ip6gre_tap_netdev_ops; 1799 dev->needs_free_netdev = true; 1800 dev->priv_destructor = ip6gre_dev_free; 1801 1802 dev->features |= NETIF_F_NETNS_LOCAL; 1803 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1804 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 1805 netif_keep_dst(dev); 1806 } 1807 1808 static bool ip6gre_netlink_encap_parms(struct nlattr *data[], 1809 struct ip_tunnel_encap *ipencap) 1810 { 1811 bool ret = false; 1812 1813 memset(ipencap, 0, sizeof(*ipencap)); 1814 1815 if (!data) 1816 return ret; 1817 1818 if (data[IFLA_GRE_ENCAP_TYPE]) { 1819 ret = true; 1820 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]); 1821 } 1822 1823 if (data[IFLA_GRE_ENCAP_FLAGS]) { 1824 ret = true; 1825 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]); 1826 } 1827 1828 if (data[IFLA_GRE_ENCAP_SPORT]) { 1829 ret = true; 1830 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]); 1831 } 1832 1833 if (data[IFLA_GRE_ENCAP_DPORT]) { 1834 ret = true; 1835 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]); 1836 } 1837 1838 return ret; 1839 } 1840 1841 static int ip6gre_newlink(struct net *src_net, struct net_device *dev, 1842 struct nlattr *tb[], struct nlattr *data[], 1843 struct netlink_ext_ack *extack) 1844 { 1845 struct ip6_tnl *nt; 1846 struct net *net = dev_net(dev); 1847 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1848 struct ip_tunnel_encap ipencap; 1849 int err; 1850 1851 nt = netdev_priv(dev); 1852 1853 if (ip6gre_netlink_encap_parms(data, &ipencap)) { 1854 int err = ip6_tnl_encap_setup(nt, &ipencap); 1855 1856 if (err < 0) 1857 return err; 1858 } 1859 1860 ip6gre_netlink_parms(data, &nt->parms); 1861 1862 if (nt->parms.collect_md) { 1863 if (rtnl_dereference(ign->collect_md_tun)) 1864 return -EEXIST; 1865 } else { 1866 if (ip6gre_tunnel_find(net, &nt->parms, dev->type)) 1867 return -EEXIST; 1868 } 1869 1870 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS]) 1871 eth_hw_addr_random(dev); 1872 1873 nt->dev = dev; 1874 nt->net = dev_net(dev); 1875 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]); 1876 1877 err = register_netdevice(dev); 1878 if (err) 1879 goto out; 1880 1881 dev_hold(dev); 1882 ip6gre_tunnel_link(ign, nt); 1883 1884 out: 1885 return err; 1886 } 1887 1888 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[], 1889 struct nlattr *data[], 1890 struct netlink_ext_ack *extack) 1891 { 1892 struct ip6_tnl *t, *nt = netdev_priv(dev); 1893 struct net *net = nt->net; 1894 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1895 struct __ip6_tnl_parm p; 1896 struct ip_tunnel_encap ipencap; 1897 1898 if (dev == ign->fb_tunnel_dev) 1899 return -EINVAL; 1900 1901 if (ip6gre_netlink_encap_parms(data, &ipencap)) { 1902 int err = ip6_tnl_encap_setup(nt, &ipencap); 1903 1904 if (err < 0) 1905 return err; 1906 } 1907 1908 ip6gre_netlink_parms(data, &p); 1909 1910 t = ip6gre_tunnel_locate(net, &p, 0); 1911 1912 if (t) { 1913 if (t->dev != dev) 1914 return -EEXIST; 1915 } else { 1916 t = nt; 1917 } 1918 1919 ip6gre_tunnel_unlink(ign, t); 1920 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]); 1921 ip6gre_tunnel_link(ign, t); 1922 return 0; 1923 } 1924 1925 static void ip6gre_dellink(struct net_device *dev, struct list_head *head) 1926 { 1927 struct net *net = dev_net(dev); 1928 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1929 1930 if (dev != ign->fb_tunnel_dev) 1931 unregister_netdevice_queue(dev, head); 1932 } 1933 1934 static size_t ip6gre_get_size(const struct net_device *dev) 1935 { 1936 return 1937 /* IFLA_GRE_LINK */ 1938 nla_total_size(4) + 1939 /* IFLA_GRE_IFLAGS */ 1940 nla_total_size(2) + 1941 /* IFLA_GRE_OFLAGS */ 1942 nla_total_size(2) + 1943 /* IFLA_GRE_IKEY */ 1944 nla_total_size(4) + 1945 /* IFLA_GRE_OKEY */ 1946 nla_total_size(4) + 1947 /* IFLA_GRE_LOCAL */ 1948 nla_total_size(sizeof(struct in6_addr)) + 1949 /* IFLA_GRE_REMOTE */ 1950 nla_total_size(sizeof(struct in6_addr)) + 1951 /* IFLA_GRE_TTL */ 1952 nla_total_size(1) + 1953 /* IFLA_GRE_ENCAP_LIMIT */ 1954 nla_total_size(1) + 1955 /* IFLA_GRE_FLOWINFO */ 1956 nla_total_size(4) + 1957 /* IFLA_GRE_FLAGS */ 1958 nla_total_size(4) + 1959 /* IFLA_GRE_ENCAP_TYPE */ 1960 nla_total_size(2) + 1961 /* IFLA_GRE_ENCAP_FLAGS */ 1962 nla_total_size(2) + 1963 /* IFLA_GRE_ENCAP_SPORT */ 1964 nla_total_size(2) + 1965 /* IFLA_GRE_ENCAP_DPORT */ 1966 nla_total_size(2) + 1967 /* IFLA_GRE_COLLECT_METADATA */ 1968 nla_total_size(0) + 1969 /* IFLA_GRE_FWMARK */ 1970 nla_total_size(4) + 1971 /* IFLA_GRE_ERSPAN_INDEX */ 1972 nla_total_size(4) + 1973 0; 1974 } 1975 1976 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev) 1977 { 1978 struct ip6_tnl *t = netdev_priv(dev); 1979 struct __ip6_tnl_parm *p = &t->parms; 1980 1981 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) || 1982 nla_put_be16(skb, IFLA_GRE_IFLAGS, 1983 gre_tnl_flags_to_gre_flags(p->i_flags)) || 1984 nla_put_be16(skb, IFLA_GRE_OFLAGS, 1985 gre_tnl_flags_to_gre_flags(p->o_flags)) || 1986 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) || 1987 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) || 1988 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) || 1989 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) || 1990 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) || 1991 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) || 1992 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) || 1993 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) || 1994 nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark) || 1995 nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index)) 1996 goto nla_put_failure; 1997 1998 if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE, 1999 t->encap.type) || 2000 nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT, 2001 t->encap.sport) || 2002 nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT, 2003 t->encap.dport) || 2004 nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS, 2005 t->encap.flags)) 2006 goto nla_put_failure; 2007 2008 if (p->collect_md) { 2009 if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA)) 2010 goto nla_put_failure; 2011 } 2012 2013 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, p->erspan_ver)) 2014 goto nla_put_failure; 2015 2016 if (p->erspan_ver == 1) { 2017 if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index)) 2018 goto nla_put_failure; 2019 } else if (p->erspan_ver == 2) { 2020 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, p->dir)) 2021 goto nla_put_failure; 2022 if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, p->hwid)) 2023 goto nla_put_failure; 2024 } 2025 2026 return 0; 2027 2028 nla_put_failure: 2029 return -EMSGSIZE; 2030 } 2031 2032 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = { 2033 [IFLA_GRE_LINK] = { .type = NLA_U32 }, 2034 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 }, 2035 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 }, 2036 [IFLA_GRE_IKEY] = { .type = NLA_U32 }, 2037 [IFLA_GRE_OKEY] = { .type = NLA_U32 }, 2038 [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) }, 2039 [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) }, 2040 [IFLA_GRE_TTL] = { .type = NLA_U8 }, 2041 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 }, 2042 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 }, 2043 [IFLA_GRE_FLAGS] = { .type = NLA_U32 }, 2044 [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 }, 2045 [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 }, 2046 [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 }, 2047 [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 }, 2048 [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG }, 2049 [IFLA_GRE_FWMARK] = { .type = NLA_U32 }, 2050 [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 }, 2051 [IFLA_GRE_ERSPAN_VER] = { .type = NLA_U8 }, 2052 [IFLA_GRE_ERSPAN_DIR] = { .type = NLA_U8 }, 2053 [IFLA_GRE_ERSPAN_HWID] = { .type = NLA_U16 }, 2054 }; 2055 2056 static void ip6erspan_tap_setup(struct net_device *dev) 2057 { 2058 ether_setup(dev); 2059 2060 dev->netdev_ops = &ip6erspan_netdev_ops; 2061 dev->needs_free_netdev = true; 2062 dev->priv_destructor = ip6gre_dev_free; 2063 2064 dev->features |= NETIF_F_NETNS_LOCAL; 2065 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 2066 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 2067 netif_keep_dst(dev); 2068 } 2069 2070 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = { 2071 .kind = "ip6gre", 2072 .maxtype = IFLA_GRE_MAX, 2073 .policy = ip6gre_policy, 2074 .priv_size = sizeof(struct ip6_tnl), 2075 .setup = ip6gre_tunnel_setup, 2076 .validate = ip6gre_tunnel_validate, 2077 .newlink = ip6gre_newlink, 2078 .changelink = ip6gre_changelink, 2079 .dellink = ip6gre_dellink, 2080 .get_size = ip6gre_get_size, 2081 .fill_info = ip6gre_fill_info, 2082 .get_link_net = ip6_tnl_get_link_net, 2083 }; 2084 2085 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = { 2086 .kind = "ip6gretap", 2087 .maxtype = IFLA_GRE_MAX, 2088 .policy = ip6gre_policy, 2089 .priv_size = sizeof(struct ip6_tnl), 2090 .setup = ip6gre_tap_setup, 2091 .validate = ip6gre_tap_validate, 2092 .newlink = ip6gre_newlink, 2093 .changelink = ip6gre_changelink, 2094 .get_size = ip6gre_get_size, 2095 .fill_info = ip6gre_fill_info, 2096 .get_link_net = ip6_tnl_get_link_net, 2097 }; 2098 2099 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly = { 2100 .kind = "ip6erspan", 2101 .maxtype = IFLA_GRE_MAX, 2102 .policy = ip6gre_policy, 2103 .priv_size = sizeof(struct ip6_tnl), 2104 .setup = ip6erspan_tap_setup, 2105 .validate = ip6erspan_tap_validate, 2106 .newlink = ip6gre_newlink, 2107 .changelink = ip6gre_changelink, 2108 .get_size = ip6gre_get_size, 2109 .fill_info = ip6gre_fill_info, 2110 .get_link_net = ip6_tnl_get_link_net, 2111 }; 2112 2113 /* 2114 * And now the modules code and kernel interface. 2115 */ 2116 2117 static int __init ip6gre_init(void) 2118 { 2119 int err; 2120 2121 pr_info("GRE over IPv6 tunneling driver\n"); 2122 2123 err = register_pernet_device(&ip6gre_net_ops); 2124 if (err < 0) 2125 return err; 2126 2127 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE); 2128 if (err < 0) { 2129 pr_info("%s: can't add protocol\n", __func__); 2130 goto add_proto_failed; 2131 } 2132 2133 err = rtnl_link_register(&ip6gre_link_ops); 2134 if (err < 0) 2135 goto rtnl_link_failed; 2136 2137 err = rtnl_link_register(&ip6gre_tap_ops); 2138 if (err < 0) 2139 goto tap_ops_failed; 2140 2141 err = rtnl_link_register(&ip6erspan_tap_ops); 2142 if (err < 0) 2143 goto erspan_link_failed; 2144 2145 out: 2146 return err; 2147 2148 erspan_link_failed: 2149 rtnl_link_unregister(&ip6gre_tap_ops); 2150 tap_ops_failed: 2151 rtnl_link_unregister(&ip6gre_link_ops); 2152 rtnl_link_failed: 2153 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE); 2154 add_proto_failed: 2155 unregister_pernet_device(&ip6gre_net_ops); 2156 goto out; 2157 } 2158 2159 static void __exit ip6gre_fini(void) 2160 { 2161 rtnl_link_unregister(&ip6gre_tap_ops); 2162 rtnl_link_unregister(&ip6gre_link_ops); 2163 rtnl_link_unregister(&ip6erspan_tap_ops); 2164 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE); 2165 unregister_pernet_device(&ip6gre_net_ops); 2166 } 2167 2168 module_init(ip6gre_init); 2169 module_exit(ip6gre_fini); 2170 MODULE_LICENSE("GPL"); 2171 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)"); 2172 MODULE_DESCRIPTION("GRE over IPv6 tunneling device"); 2173 MODULE_ALIAS_RTNL_LINK("ip6gre"); 2174 MODULE_ALIAS_RTNL_LINK("ip6gretap"); 2175 MODULE_ALIAS_RTNL_LINK("ip6erspan"); 2176 MODULE_ALIAS_NETDEV("ip6gre0"); 2177