1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 3 * GRE over IPv6 protocol decoder. 4 * 5 * Authors: Dmitry Kozlov (xeb@mail.ru) 6 */ 7 8#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 9 10#include <linux/capability.h> 11#include <linux/module.h> 12#include <linux/types.h> 13#include <linux/kernel.h> 14#include <linux/slab.h> 15#include <linux/uaccess.h> 16#include <linux/skbuff.h> 17#include <linux/netdevice.h> 18#include <linux/in.h> 19#include <linux/tcp.h> 20#include <linux/udp.h> 21#include <linux/if_arp.h> 22#include <linux/init.h> 23#include <linux/in6.h> 24#include <linux/inetdevice.h> 25#include <linux/igmp.h> 26#include <linux/netfilter_ipv4.h> 27#include <linux/etherdevice.h> 28#include <linux/if_ether.h> 29#include <linux/hash.h> 30#include <linux/if_tunnel.h> 31#include <linux/ip6_tunnel.h> 32 33#include <net/sock.h> 34#include <net/ip.h> 35#include <net/ip_tunnels.h> 36#include <net/icmp.h> 37#include <net/protocol.h> 38#include <net/addrconf.h> 39#include <net/arp.h> 40#include <net/checksum.h> 41#include <net/dsfield.h> 42#include <net/inet_ecn.h> 43#include <net/xfrm.h> 44#include <net/net_namespace.h> 45#include <net/netns/generic.h> 46#include <net/rtnetlink.h> 47 48#include <net/ipv6.h> 49#include <net/ip6_fib.h> 50#include <net/ip6_route.h> 51#include <net/ip6_tunnel.h> 52#include <net/gre.h> 53#include <net/erspan.h> 54#include <net/dst_metadata.h> 55 56 57static bool log_ecn_error = true; 58module_param(log_ecn_error, bool, 0644); 59MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); 60 61#define IP6_GRE_HASH_SIZE_SHIFT 5 62#define IP6_GRE_HASH_SIZE (1 << IP6_GRE_HASH_SIZE_SHIFT) 63 64static unsigned int ip6gre_net_id __read_mostly; 65struct ip6gre_net { 66 struct ip6_tnl __rcu *tunnels[4][IP6_GRE_HASH_SIZE]; 67 68 struct ip6_tnl __rcu *collect_md_tun; 69 struct ip6_tnl __rcu *collect_md_tun_erspan; 70 struct net_device *fb_tunnel_dev; 71}; 72 73static struct rtnl_link_ops ip6gre_link_ops __read_mostly; 74static struct rtnl_link_ops ip6gre_tap_ops __read_mostly; 75static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly; 76static int ip6gre_tunnel_init(struct net_device *dev); 77static void ip6gre_tunnel_setup(struct net_device *dev); 78static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t); 79static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu); 80static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu); 81 82/* Tunnel hash table */ 83 84/* 85 4 hash tables: 86 87 3: (remote,local) 88 2: (remote,*) 89 1: (*,local) 90 0: (*,*) 91 92 We require exact key match i.e. if a key is present in packet 93 it will match only tunnel with the same key; if it is not present, 94 it will match only keyless tunnel. 95 96 All keysless packets, if not matched configured keyless tunnels 97 will match fallback tunnel. 98 */ 99 100#define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(IP6_GRE_HASH_SIZE - 1)) 101static u32 HASH_ADDR(const struct in6_addr *addr) 102{ 103 u32 hash = ipv6_addr_hash(addr); 104 105 return hash_32(hash, IP6_GRE_HASH_SIZE_SHIFT); 106} 107 108#define tunnels_r_l tunnels[3] 109#define tunnels_r tunnels[2] 110#define tunnels_l tunnels[1] 111#define tunnels_wc tunnels[0] 112 113/* Given src, dst and key, find appropriate for input tunnel. */ 114 115static struct ip6_tnl *ip6gre_tunnel_lookup(struct net_device *dev, 116 const struct in6_addr *remote, const struct in6_addr *local, 117 __be32 key, __be16 gre_proto) 118{ 119 struct net *net = dev_net(dev); 120 int link = dev->ifindex; 121 unsigned int h0 = HASH_ADDR(remote); 122 unsigned int h1 = HASH_KEY(key); 123 struct ip6_tnl *t, *cand = NULL; 124 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 125 int dev_type = (gre_proto == htons(ETH_P_TEB) || 126 gre_proto == htons(ETH_P_ERSPAN) || 127 gre_proto == htons(ETH_P_ERSPAN2)) ? 128 ARPHRD_ETHER : ARPHRD_IP6GRE; 129 int score, cand_score = 4; 130 struct net_device *ndev; 131 132 for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) { 133 if (!ipv6_addr_equal(local, &t->parms.laddr) || 134 !ipv6_addr_equal(remote, &t->parms.raddr) || 135 key != t->parms.i_key || 136 !(t->dev->flags & IFF_UP)) 137 continue; 138 139 if (t->dev->type != ARPHRD_IP6GRE && 140 t->dev->type != dev_type) 141 continue; 142 143 score = 0; 144 if (t->parms.link != link) 145 score |= 1; 146 if (t->dev->type != dev_type) 147 score |= 2; 148 if (score == 0) 149 return t; 150 151 if (score < cand_score) { 152 cand = t; 153 cand_score = score; 154 } 155 } 156 157 for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) { 158 if (!ipv6_addr_equal(remote, &t->parms.raddr) || 159 key != t->parms.i_key || 160 !(t->dev->flags & IFF_UP)) 161 continue; 162 163 if (t->dev->type != ARPHRD_IP6GRE && 164 t->dev->type != dev_type) 165 continue; 166 167 score = 0; 168 if (t->parms.link != link) 169 score |= 1; 170 if (t->dev->type != dev_type) 171 score |= 2; 172 if (score == 0) 173 return t; 174 175 if (score < cand_score) { 176 cand = t; 177 cand_score = score; 178 } 179 } 180 181 for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) { 182 if ((!ipv6_addr_equal(local, &t->parms.laddr) && 183 (!ipv6_addr_equal(local, &t->parms.raddr) || 184 !ipv6_addr_is_multicast(local))) || 185 key != t->parms.i_key || 186 !(t->dev->flags & IFF_UP)) 187 continue; 188 189 if (t->dev->type != ARPHRD_IP6GRE && 190 t->dev->type != dev_type) 191 continue; 192 193 score = 0; 194 if (t->parms.link != link) 195 score |= 1; 196 if (t->dev->type != dev_type) 197 score |= 2; 198 if (score == 0) 199 return t; 200 201 if (score < cand_score) { 202 cand = t; 203 cand_score = score; 204 } 205 } 206 207 for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) { 208 if (t->parms.i_key != key || 209 !(t->dev->flags & IFF_UP)) 210 continue; 211 212 if (t->dev->type != ARPHRD_IP6GRE && 213 t->dev->type != dev_type) 214 continue; 215 216 score = 0; 217 if (t->parms.link != link) 218 score |= 1; 219 if (t->dev->type != dev_type) 220 score |= 2; 221 if (score == 0) 222 return t; 223 224 if (score < cand_score) { 225 cand = t; 226 cand_score = score; 227 } 228 } 229 230 if (cand) 231 return cand; 232 233 if (gre_proto == htons(ETH_P_ERSPAN) || 234 gre_proto == htons(ETH_P_ERSPAN2)) 235 t = rcu_dereference(ign->collect_md_tun_erspan); 236 else 237 t = rcu_dereference(ign->collect_md_tun); 238 239 if (t && t->dev->flags & IFF_UP) 240 return t; 241 242 ndev = READ_ONCE(ign->fb_tunnel_dev); 243 if (ndev && ndev->flags & IFF_UP) 244 return netdev_priv(ndev); 245 246 return NULL; 247} 248 249static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign, 250 const struct __ip6_tnl_parm *p) 251{ 252 const struct in6_addr *remote = &p->raddr; 253 const struct in6_addr *local = &p->laddr; 254 unsigned int h = HASH_KEY(p->i_key); 255 int prio = 0; 256 257 if (!ipv6_addr_any(local)) 258 prio |= 1; 259 if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) { 260 prio |= 2; 261 h ^= HASH_ADDR(remote); 262 } 263 264 return &ign->tunnels[prio][h]; 265} 266 267static void ip6gre_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t) 268{ 269 if (t->parms.collect_md) 270 rcu_assign_pointer(ign->collect_md_tun, t); 271} 272 273static void ip6erspan_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t) 274{ 275 if (t->parms.collect_md) 276 rcu_assign_pointer(ign->collect_md_tun_erspan, t); 277} 278 279static void ip6gre_tunnel_unlink_md(struct ip6gre_net *ign, struct ip6_tnl *t) 280{ 281 if (t->parms.collect_md) 282 rcu_assign_pointer(ign->collect_md_tun, NULL); 283} 284 285static void ip6erspan_tunnel_unlink_md(struct ip6gre_net *ign, 286 struct ip6_tnl *t) 287{ 288 if (t->parms.collect_md) 289 rcu_assign_pointer(ign->collect_md_tun_erspan, NULL); 290} 291 292static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign, 293 const struct ip6_tnl *t) 294{ 295 return __ip6gre_bucket(ign, &t->parms); 296} 297 298static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t) 299{ 300 struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t); 301 302 rcu_assign_pointer(t->next, rtnl_dereference(*tp)); 303 rcu_assign_pointer(*tp, t); 304} 305 306static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t) 307{ 308 struct ip6_tnl __rcu **tp; 309 struct ip6_tnl *iter; 310 311 for (tp = ip6gre_bucket(ign, t); 312 (iter = rtnl_dereference(*tp)) != NULL; 313 tp = &iter->next) { 314 if (t == iter) { 315 rcu_assign_pointer(*tp, t->next); 316 break; 317 } 318 } 319} 320 321static struct ip6_tnl *ip6gre_tunnel_find(struct net *net, 322 const struct __ip6_tnl_parm *parms, 323 int type) 324{ 325 const struct in6_addr *remote = &parms->raddr; 326 const struct in6_addr *local = &parms->laddr; 327 __be32 key = parms->i_key; 328 int link = parms->link; 329 struct ip6_tnl *t; 330 struct ip6_tnl __rcu **tp; 331 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 332 333 for (tp = __ip6gre_bucket(ign, parms); 334 (t = rtnl_dereference(*tp)) != NULL; 335 tp = &t->next) 336 if (ipv6_addr_equal(local, &t->parms.laddr) && 337 ipv6_addr_equal(remote, &t->parms.raddr) && 338 key == t->parms.i_key && 339 link == t->parms.link && 340 type == t->dev->type) 341 break; 342 343 return t; 344} 345 346static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net, 347 const struct __ip6_tnl_parm *parms, int create) 348{ 349 struct ip6_tnl *t, *nt; 350 struct net_device *dev; 351 char name[IFNAMSIZ]; 352 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 353 354 t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE); 355 if (t && create) 356 return NULL; 357 if (t || !create) 358 return t; 359 360 if (parms->name[0]) { 361 if (!dev_valid_name(parms->name)) 362 return NULL; 363 strlcpy(name, parms->name, IFNAMSIZ); 364 } else { 365 strcpy(name, "ip6gre%d"); 366 } 367 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, 368 ip6gre_tunnel_setup); 369 if (!dev) 370 return NULL; 371 372 dev_net_set(dev, net); 373 374 nt = netdev_priv(dev); 375 nt->parms = *parms; 376 dev->rtnl_link_ops = &ip6gre_link_ops; 377 378 nt->dev = dev; 379 nt->net = dev_net(dev); 380 381 if (register_netdevice(dev) < 0) 382 goto failed_free; 383 384 ip6gre_tnl_link_config(nt, 1); 385 386 /* Can use a lockless transmit, unless we generate output sequences */ 387 if (!(nt->parms.o_flags & TUNNEL_SEQ)) 388 dev->features |= NETIF_F_LLTX; 389 390 ip6gre_tunnel_link(ign, nt); 391 return nt; 392 393failed_free: 394 free_netdev(dev); 395 return NULL; 396} 397 398static void ip6erspan_tunnel_uninit(struct net_device *dev) 399{ 400 struct ip6_tnl *t = netdev_priv(dev); 401 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id); 402 403 ip6erspan_tunnel_unlink_md(ign, t); 404 ip6gre_tunnel_unlink(ign, t); 405 dst_cache_reset(&t->dst_cache); 406 dev_put(dev); 407} 408 409static void ip6gre_tunnel_uninit(struct net_device *dev) 410{ 411 struct ip6_tnl *t = netdev_priv(dev); 412 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id); 413 414 ip6gre_tunnel_unlink_md(ign, t); 415 ip6gre_tunnel_unlink(ign, t); 416 if (ign->fb_tunnel_dev == dev) 417 WRITE_ONCE(ign->fb_tunnel_dev, NULL); 418 dst_cache_reset(&t->dst_cache); 419 dev_put(dev); 420} 421 422 423static int ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 424 u8 type, u8 code, int offset, __be32 info) 425{ 426 struct net *net = dev_net(skb->dev); 427 const struct ipv6hdr *ipv6h; 428 struct tnl_ptk_info tpi; 429 struct ip6_tnl *t; 430 431 if (gre_parse_header(skb, &tpi, NULL, htons(ETH_P_IPV6), 432 offset) < 0) 433 return -EINVAL; 434 435 ipv6h = (const struct ipv6hdr *)skb->data; 436 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr, 437 tpi.key, tpi.proto); 438 if (!t) 439 return -ENOENT; 440 441 switch (type) { 442 case ICMPV6_DEST_UNREACH: 443 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n", 444 t->parms.name); 445 if (code != ICMPV6_PORT_UNREACH) 446 break; 447 return 0; 448 case ICMPV6_TIME_EXCEED: 449 if (code == ICMPV6_EXC_HOPLIMIT) { 450 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n", 451 t->parms.name); 452 break; 453 } 454 return 0; 455 case ICMPV6_PARAMPROB: { 456 struct ipv6_tlv_tnl_enc_lim *tel; 457 __u32 teli; 458 459 teli = 0; 460 if (code == ICMPV6_HDR_FIELD) 461 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data); 462 463 if (teli && teli == be32_to_cpu(info) - 2) { 464 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli]; 465 if (tel->encap_limit == 0) { 466 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n", 467 t->parms.name); 468 } 469 } else { 470 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n", 471 t->parms.name); 472 } 473 return 0; 474 } 475 case ICMPV6_PKT_TOOBIG: 476 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL)); 477 return 0; 478 case NDISC_REDIRECT: 479 ip6_redirect(skb, net, skb->dev->ifindex, 0, 480 sock_net_uid(net, NULL)); 481 return 0; 482 } 483 484 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO)) 485 t->err_count++; 486 else 487 t->err_count = 1; 488 t->err_time = jiffies; 489 490 return 0; 491} 492 493static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi) 494{ 495 const struct ipv6hdr *ipv6h; 496 struct ip6_tnl *tunnel; 497 498 ipv6h = ipv6_hdr(skb); 499 tunnel = ip6gre_tunnel_lookup(skb->dev, 500 &ipv6h->saddr, &ipv6h->daddr, tpi->key, 501 tpi->proto); 502 if (tunnel) { 503 if (tunnel->parms.collect_md) { 504 struct metadata_dst *tun_dst; 505 __be64 tun_id; 506 __be16 flags; 507 508 flags = tpi->flags; 509 tun_id = key32_to_tunnel_id(tpi->key); 510 511 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id, 0); 512 if (!tun_dst) 513 return PACKET_REJECT; 514 515 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error); 516 } else { 517 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error); 518 } 519 520 return PACKET_RCVD; 521 } 522 523 return PACKET_REJECT; 524} 525 526static int ip6erspan_rcv(struct sk_buff *skb, 527 struct tnl_ptk_info *tpi, 528 int gre_hdr_len) 529{ 530 struct erspan_base_hdr *ershdr; 531 const struct ipv6hdr *ipv6h; 532 struct erspan_md2 *md2; 533 struct ip6_tnl *tunnel; 534 u8 ver; 535 536 ipv6h = ipv6_hdr(skb); 537 ershdr = (struct erspan_base_hdr *)skb->data; 538 ver = ershdr->ver; 539 540 tunnel = ip6gre_tunnel_lookup(skb->dev, 541 &ipv6h->saddr, &ipv6h->daddr, tpi->key, 542 tpi->proto); 543 if (tunnel) { 544 int len = erspan_hdr_len(ver); 545 546 if (unlikely(!pskb_may_pull(skb, len))) 547 return PACKET_REJECT; 548 549 if (__iptunnel_pull_header(skb, len, 550 htons(ETH_P_TEB), 551 false, false) < 0) 552 return PACKET_REJECT; 553 554 if (tunnel->parms.collect_md) { 555 struct erspan_metadata *pkt_md, *md; 556 struct metadata_dst *tun_dst; 557 struct ip_tunnel_info *info; 558 unsigned char *gh; 559 __be64 tun_id; 560 __be16 flags; 561 562 tpi->flags |= TUNNEL_KEY; 563 flags = tpi->flags; 564 tun_id = key32_to_tunnel_id(tpi->key); 565 566 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id, 567 sizeof(*md)); 568 if (!tun_dst) 569 return PACKET_REJECT; 570 571 /* skb can be uncloned in __iptunnel_pull_header, so 572 * old pkt_md is no longer valid and we need to reset 573 * it 574 */ 575 gh = skb_network_header(skb) + 576 skb_network_header_len(skb); 577 pkt_md = (struct erspan_metadata *)(gh + gre_hdr_len + 578 sizeof(*ershdr)); 579 info = &tun_dst->u.tun_info; 580 md = ip_tunnel_info_opts(info); 581 md->version = ver; 582 md2 = &md->u.md2; 583 memcpy(md2, pkt_md, ver == 1 ? ERSPAN_V1_MDSIZE : 584 ERSPAN_V2_MDSIZE); 585 info->key.tun_flags |= TUNNEL_ERSPAN_OPT; 586 info->options_len = sizeof(*md); 587 588 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error); 589 590 } else { 591 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error); 592 } 593 594 return PACKET_RCVD; 595 } 596 597 return PACKET_REJECT; 598} 599 600static int gre_rcv(struct sk_buff *skb) 601{ 602 struct tnl_ptk_info tpi; 603 bool csum_err = false; 604 int hdr_len; 605 606 hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0); 607 if (hdr_len < 0) 608 goto drop; 609 610 if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false)) 611 goto drop; 612 613 if (unlikely(tpi.proto == htons(ETH_P_ERSPAN) || 614 tpi.proto == htons(ETH_P_ERSPAN2))) { 615 if (ip6erspan_rcv(skb, &tpi, hdr_len) == PACKET_RCVD) 616 return 0; 617 goto out; 618 } 619 620 if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD) 621 return 0; 622 623out: 624 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); 625drop: 626 kfree_skb(skb); 627 return 0; 628} 629 630static int gre_handle_offloads(struct sk_buff *skb, bool csum) 631{ 632 return iptunnel_handle_offloads(skb, 633 csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE); 634} 635 636static void prepare_ip6gre_xmit_ipv4(struct sk_buff *skb, 637 struct net_device *dev, 638 struct flowi6 *fl6, __u8 *dsfield, 639 int *encap_limit) 640{ 641 const struct iphdr *iph = ip_hdr(skb); 642 struct ip6_tnl *t = netdev_priv(dev); 643 644 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 645 *encap_limit = t->parms.encap_limit; 646 647 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6)); 648 649 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) 650 *dsfield = ipv4_get_dsfield(iph); 651 else 652 *dsfield = ip6_tclass(t->parms.flowinfo); 653 654 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) 655 fl6->flowi6_mark = skb->mark; 656 else 657 fl6->flowi6_mark = t->parms.fwmark; 658 659 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL); 660} 661 662static int prepare_ip6gre_xmit_ipv6(struct sk_buff *skb, 663 struct net_device *dev, 664 struct flowi6 *fl6, __u8 *dsfield, 665 int *encap_limit) 666{ 667 struct ipv6hdr *ipv6h; 668 struct ip6_tnl *t = netdev_priv(dev); 669 __u16 offset; 670 671 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb)); 672 /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */ 673 ipv6h = ipv6_hdr(skb); 674 675 if (offset > 0) { 676 struct ipv6_tlv_tnl_enc_lim *tel; 677 678 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset]; 679 if (tel->encap_limit == 0) { 680 icmpv6_ndo_send(skb, ICMPV6_PARAMPROB, 681 ICMPV6_HDR_FIELD, offset + 2); 682 return -1; 683 } 684 *encap_limit = tel->encap_limit - 1; 685 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) { 686 *encap_limit = t->parms.encap_limit; 687 } 688 689 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6)); 690 691 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) 692 *dsfield = ipv6_get_dsfield(ipv6h); 693 else 694 *dsfield = ip6_tclass(t->parms.flowinfo); 695 696 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL) 697 fl6->flowlabel |= ip6_flowlabel(ipv6h); 698 699 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) 700 fl6->flowi6_mark = skb->mark; 701 else 702 fl6->flowi6_mark = t->parms.fwmark; 703 704 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL); 705 706 return 0; 707} 708 709static struct ip_tunnel_info *skb_tunnel_info_txcheck(struct sk_buff *skb) 710{ 711 struct ip_tunnel_info *tun_info; 712 713 tun_info = skb_tunnel_info(skb); 714 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX))) 715 return ERR_PTR(-EINVAL); 716 717 return tun_info; 718} 719 720static netdev_tx_t __gre6_xmit(struct sk_buff *skb, 721 struct net_device *dev, __u8 dsfield, 722 struct flowi6 *fl6, int encap_limit, 723 __u32 *pmtu, __be16 proto) 724{ 725 struct ip6_tnl *tunnel = netdev_priv(dev); 726 __be16 protocol; 727 __be16 flags; 728 729 if (dev->type == ARPHRD_ETHER) 730 IPCB(skb)->flags = 0; 731 732 if (dev->header_ops && dev->type == ARPHRD_IP6GRE) 733 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr; 734 else 735 fl6->daddr = tunnel->parms.raddr; 736 737 /* Push GRE header. */ 738 protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto; 739 740 if (tunnel->parms.collect_md) { 741 struct ip_tunnel_info *tun_info; 742 const struct ip_tunnel_key *key; 743 int tun_hlen; 744 745 tun_info = skb_tunnel_info_txcheck(skb); 746 if (IS_ERR(tun_info) || 747 unlikely(ip_tunnel_info_af(tun_info) != AF_INET6)) 748 return -EINVAL; 749 750 key = &tun_info->key; 751 memset(fl6, 0, sizeof(*fl6)); 752 fl6->flowi6_proto = IPPROTO_GRE; 753 fl6->daddr = key->u.ipv6.dst; 754 fl6->flowlabel = key->label; 755 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL); 756 fl6->fl6_gre_key = tunnel_id_to_key32(key->tun_id); 757 758 dsfield = key->tos; 759 flags = key->tun_flags & 760 (TUNNEL_CSUM | TUNNEL_KEY | TUNNEL_SEQ); 761 tun_hlen = gre_calc_hlen(flags); 762 763 if (skb_cow_head(skb, dev->needed_headroom ?: tun_hlen + tunnel->encap_hlen)) 764 return -ENOMEM; 765 766 gre_build_header(skb, tun_hlen, 767 flags, protocol, 768 tunnel_id_to_key32(tun_info->key.tun_id), 769 (flags & TUNNEL_SEQ) ? htonl(atomic_fetch_inc(&tunnel->o_seqno)) 770 : 0); 771 772 } else { 773 if (skb_cow_head(skb, dev->needed_headroom ?: tunnel->hlen)) 774 return -ENOMEM; 775 776 flags = tunnel->parms.o_flags; 777 778 gre_build_header(skb, tunnel->tun_hlen, flags, 779 protocol, tunnel->parms.o_key, 780 (flags & TUNNEL_SEQ) ? htonl(atomic_fetch_inc(&tunnel->o_seqno)) 781 : 0); 782 } 783 784 return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu, 785 NEXTHDR_GRE); 786} 787 788static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev) 789{ 790 struct ip6_tnl *t = netdev_priv(dev); 791 int encap_limit = -1; 792 struct flowi6 fl6; 793 __u8 dsfield = 0; 794 __u32 mtu; 795 int err; 796 797 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); 798 799 if (!t->parms.collect_md) 800 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6, 801 &dsfield, &encap_limit); 802 803 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)); 804 if (err) 805 return -1; 806 807 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, 808 skb->protocol); 809 if (err != 0) { 810 /* XXX: send ICMP error even if DF is not set. */ 811 if (err == -EMSGSIZE) 812 icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, 813 htonl(mtu)); 814 return -1; 815 } 816 817 return 0; 818} 819 820static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev) 821{ 822 struct ip6_tnl *t = netdev_priv(dev); 823 struct ipv6hdr *ipv6h = ipv6_hdr(skb); 824 int encap_limit = -1; 825 struct flowi6 fl6; 826 __u8 dsfield = 0; 827 __u32 mtu; 828 int err; 829 830 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr)) 831 return -1; 832 833 if (!t->parms.collect_md && 834 prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, &dsfield, &encap_limit)) 835 return -1; 836 837 if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM))) 838 return -1; 839 840 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, 841 &mtu, skb->protocol); 842 if (err != 0) { 843 if (err == -EMSGSIZE) 844 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 845 return -1; 846 } 847 848 return 0; 849} 850 851/** 852 * ip6gre_tnl_addr_conflict - compare packet addresses to tunnel's own 853 * @t: the outgoing tunnel device 854 * @hdr: IPv6 header from the incoming packet 855 * 856 * Description: 857 * Avoid trivial tunneling loop by checking that tunnel exit-point 858 * doesn't match source of incoming packet. 859 * 860 * Return: 861 * 1 if conflict, 862 * 0 else 863 **/ 864 865static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t, 866 const struct ipv6hdr *hdr) 867{ 868 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); 869} 870 871static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev) 872{ 873 struct ip6_tnl *t = netdev_priv(dev); 874 int encap_limit = -1; 875 struct flowi6 fl6; 876 __u32 mtu; 877 int err; 878 879 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 880 encap_limit = t->parms.encap_limit; 881 882 if (!t->parms.collect_md) 883 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); 884 885 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)); 886 if (err) 887 return err; 888 889 err = __gre6_xmit(skb, dev, 0, &fl6, encap_limit, &mtu, skb->protocol); 890 891 return err; 892} 893 894static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb, 895 struct net_device *dev) 896{ 897 struct ip6_tnl *t = netdev_priv(dev); 898 struct net_device_stats *stats = &t->dev->stats; 899 int ret; 900 901 if (!pskb_inet_may_pull(skb)) 902 goto tx_err; 903 904 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr)) 905 goto tx_err; 906 907 switch (skb->protocol) { 908 case htons(ETH_P_IP): 909 ret = ip6gre_xmit_ipv4(skb, dev); 910 break; 911 case htons(ETH_P_IPV6): 912 ret = ip6gre_xmit_ipv6(skb, dev); 913 break; 914 default: 915 ret = ip6gre_xmit_other(skb, dev); 916 break; 917 } 918 919 if (ret < 0) 920 goto tx_err; 921 922 return NETDEV_TX_OK; 923 924tx_err: 925 if (!t->parms.collect_md || !IS_ERR(skb_tunnel_info_txcheck(skb))) 926 stats->tx_errors++; 927 stats->tx_dropped++; 928 kfree_skb(skb); 929 return NETDEV_TX_OK; 930} 931 932static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb, 933 struct net_device *dev) 934{ 935 struct ip_tunnel_info *tun_info = NULL; 936 struct ip6_tnl *t = netdev_priv(dev); 937 struct dst_entry *dst = skb_dst(skb); 938 struct net_device_stats *stats; 939 bool truncate = false; 940 int encap_limit = -1; 941 __u8 dsfield = false; 942 struct flowi6 fl6; 943 int err = -EINVAL; 944 __be16 proto; 945 __u32 mtu; 946 int nhoff; 947 948 if (!pskb_inet_may_pull(skb)) 949 goto tx_err; 950 951 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr)) 952 goto tx_err; 953 954 if (gre_handle_offloads(skb, false)) 955 goto tx_err; 956 957 if (skb->len > dev->mtu + dev->hard_header_len) { 958 if (pskb_trim(skb, dev->mtu + dev->hard_header_len)) 959 goto tx_err; 960 truncate = true; 961 } 962 963 nhoff = skb_network_offset(skb); 964 if (skb->protocol == htons(ETH_P_IP) && 965 (ntohs(ip_hdr(skb)->tot_len) > skb->len - nhoff)) 966 truncate = true; 967 968 if (skb->protocol == htons(ETH_P_IPV6)) { 969 int thoff; 970 971 if (skb_transport_header_was_set(skb)) 972 thoff = skb_transport_offset(skb); 973 else 974 thoff = nhoff + sizeof(struct ipv6hdr); 975 if (ntohs(ipv6_hdr(skb)->payload_len) > skb->len - thoff) 976 truncate = true; 977 } 978 979 if (skb_cow_head(skb, dev->needed_headroom ?: t->hlen)) 980 goto tx_err; 981 982 t->parms.o_flags &= ~TUNNEL_KEY; 983 IPCB(skb)->flags = 0; 984 985 /* For collect_md mode, derive fl6 from the tunnel key, 986 * for native mode, call prepare_ip6gre_xmit_{ipv4,ipv6}. 987 */ 988 if (t->parms.collect_md) { 989 const struct ip_tunnel_key *key; 990 struct erspan_metadata *md; 991 __be32 tun_id; 992 993 tun_info = skb_tunnel_info_txcheck(skb); 994 if (IS_ERR(tun_info) || 995 unlikely(ip_tunnel_info_af(tun_info) != AF_INET6)) 996 goto tx_err; 997 998 key = &tun_info->key; 999 memset(&fl6, 0, sizeof(fl6)); 1000 fl6.flowi6_proto = IPPROTO_GRE; 1001 fl6.daddr = key->u.ipv6.dst; 1002 fl6.flowlabel = key->label; 1003 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL); 1004 fl6.fl6_gre_key = tunnel_id_to_key32(key->tun_id); 1005 1006 dsfield = key->tos; 1007 if (!(tun_info->key.tun_flags & TUNNEL_ERSPAN_OPT)) 1008 goto tx_err; 1009 if (tun_info->options_len < sizeof(*md)) 1010 goto tx_err; 1011 md = ip_tunnel_info_opts(tun_info); 1012 1013 tun_id = tunnel_id_to_key32(key->tun_id); 1014 if (md->version == 1) { 1015 erspan_build_header(skb, 1016 ntohl(tun_id), 1017 ntohl(md->u.index), truncate, 1018 false); 1019 proto = htons(ETH_P_ERSPAN); 1020 } else if (md->version == 2) { 1021 erspan_build_header_v2(skb, 1022 ntohl(tun_id), 1023 md->u.md2.dir, 1024 get_hwid(&md->u.md2), 1025 truncate, false); 1026 proto = htons(ETH_P_ERSPAN2); 1027 } else { 1028 goto tx_err; 1029 } 1030 } else { 1031 switch (skb->protocol) { 1032 case htons(ETH_P_IP): 1033 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); 1034 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6, 1035 &dsfield, &encap_limit); 1036 break; 1037 case htons(ETH_P_IPV6): 1038 if (ipv6_addr_equal(&t->parms.raddr, &ipv6_hdr(skb)->saddr)) 1039 goto tx_err; 1040 if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, 1041 &dsfield, &encap_limit)) 1042 goto tx_err; 1043 break; 1044 default: 1045 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); 1046 break; 1047 } 1048 1049 if (t->parms.erspan_ver == 1) { 1050 erspan_build_header(skb, ntohl(t->parms.o_key), 1051 t->parms.index, 1052 truncate, false); 1053 proto = htons(ETH_P_ERSPAN); 1054 } else if (t->parms.erspan_ver == 2) { 1055 erspan_build_header_v2(skb, ntohl(t->parms.o_key), 1056 t->parms.dir, 1057 t->parms.hwid, 1058 truncate, false); 1059 proto = htons(ETH_P_ERSPAN2); 1060 } else { 1061 goto tx_err; 1062 } 1063 1064 fl6.daddr = t->parms.raddr; 1065 } 1066 1067 /* Push GRE header. */ 1068 gre_build_header(skb, 8, TUNNEL_SEQ, proto, 0, htonl(atomic_fetch_inc(&t->o_seqno))); 1069 1070 /* TooBig packet may have updated dst->dev's mtu */ 1071 if (!t->parms.collect_md && dst && dst_mtu(dst) > dst->dev->mtu) 1072 dst->ops->update_pmtu(dst, NULL, skb, dst->dev->mtu, false); 1073 1074 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, 1075 NEXTHDR_GRE); 1076 if (err != 0) { 1077 /* XXX: send ICMP error even if DF is not set. */ 1078 if (err == -EMSGSIZE) { 1079 if (skb->protocol == htons(ETH_P_IP)) 1080 icmp_ndo_send(skb, ICMP_DEST_UNREACH, 1081 ICMP_FRAG_NEEDED, htonl(mtu)); 1082 else 1083 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 1084 } 1085 1086 goto tx_err; 1087 } 1088 return NETDEV_TX_OK; 1089 1090tx_err: 1091 stats = &t->dev->stats; 1092 if (!IS_ERR(tun_info)) 1093 stats->tx_errors++; 1094 stats->tx_dropped++; 1095 kfree_skb(skb); 1096 return NETDEV_TX_OK; 1097} 1098 1099static void ip6gre_tnl_link_config_common(struct ip6_tnl *t) 1100{ 1101 struct net_device *dev = t->dev; 1102 struct __ip6_tnl_parm *p = &t->parms; 1103 struct flowi6 *fl6 = &t->fl.u.ip6; 1104 1105 if (dev->type != ARPHRD_ETHER) { 1106 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); 1107 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); 1108 } 1109 1110 /* Set up flowi template */ 1111 fl6->saddr = p->laddr; 1112 fl6->daddr = p->raddr; 1113 fl6->flowi6_oif = p->link; 1114 fl6->flowlabel = 0; 1115 fl6->flowi6_proto = IPPROTO_GRE; 1116 fl6->fl6_gre_key = t->parms.o_key; 1117 1118 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) 1119 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; 1120 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) 1121 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; 1122 1123 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET); 1124 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr); 1125 1126 if (p->flags&IP6_TNL_F_CAP_XMIT && 1127 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER) 1128 dev->flags |= IFF_POINTOPOINT; 1129 else 1130 dev->flags &= ~IFF_POINTOPOINT; 1131} 1132 1133static void ip6gre_tnl_link_config_route(struct ip6_tnl *t, int set_mtu, 1134 int t_hlen) 1135{ 1136 const struct __ip6_tnl_parm *p = &t->parms; 1137 struct net_device *dev = t->dev; 1138 1139 if (p->flags & IP6_TNL_F_CAP_XMIT) { 1140 int strict = (ipv6_addr_type(&p->raddr) & 1141 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); 1142 1143 struct rt6_info *rt = rt6_lookup(t->net, 1144 &p->raddr, &p->laddr, 1145 p->link, NULL, strict); 1146 1147 if (!rt) 1148 return; 1149 1150 if (rt->dst.dev) { 1151 unsigned short dst_len = rt->dst.dev->hard_header_len + 1152 t_hlen; 1153 1154 if (t->dev->header_ops) 1155 dev->hard_header_len = dst_len; 1156 else 1157 dev->needed_headroom = dst_len; 1158 1159 if (set_mtu) { 1160 int mtu = rt->dst.dev->mtu - t_hlen; 1161 1162 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1163 mtu -= 8; 1164 if (dev->type == ARPHRD_ETHER) 1165 mtu -= ETH_HLEN; 1166 1167 if (mtu < IPV6_MIN_MTU) 1168 mtu = IPV6_MIN_MTU; 1169 WRITE_ONCE(dev->mtu, mtu); 1170 } 1171 } 1172 ip6_rt_put(rt); 1173 } 1174} 1175 1176static int ip6gre_calc_hlen(struct ip6_tnl *tunnel) 1177{ 1178 int t_hlen; 1179 1180 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags); 1181 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen; 1182 1183 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr); 1184 1185 if (tunnel->dev->header_ops) 1186 tunnel->dev->hard_header_len = LL_MAX_HEADER + t_hlen; 1187 else 1188 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen; 1189 1190 return t_hlen; 1191} 1192 1193static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu) 1194{ 1195 ip6gre_tnl_link_config_common(t); 1196 ip6gre_tnl_link_config_route(t, set_mtu, ip6gre_calc_hlen(t)); 1197} 1198 1199static void ip6gre_tnl_copy_tnl_parm(struct ip6_tnl *t, 1200 const struct __ip6_tnl_parm *p) 1201{ 1202 t->parms.laddr = p->laddr; 1203 t->parms.raddr = p->raddr; 1204 t->parms.flags = p->flags; 1205 t->parms.hop_limit = p->hop_limit; 1206 t->parms.encap_limit = p->encap_limit; 1207 t->parms.flowinfo = p->flowinfo; 1208 t->parms.link = p->link; 1209 t->parms.proto = p->proto; 1210 t->parms.i_key = p->i_key; 1211 t->parms.o_key = p->o_key; 1212 t->parms.i_flags = p->i_flags; 1213 t->parms.o_flags = p->o_flags; 1214 t->parms.fwmark = p->fwmark; 1215 t->parms.erspan_ver = p->erspan_ver; 1216 t->parms.index = p->index; 1217 t->parms.dir = p->dir; 1218 t->parms.hwid = p->hwid; 1219 dst_cache_reset(&t->dst_cache); 1220} 1221 1222static int ip6gre_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p, 1223 int set_mtu) 1224{ 1225 ip6gre_tnl_copy_tnl_parm(t, p); 1226 ip6gre_tnl_link_config(t, set_mtu); 1227 return 0; 1228} 1229 1230static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p, 1231 const struct ip6_tnl_parm2 *u) 1232{ 1233 p->laddr = u->laddr; 1234 p->raddr = u->raddr; 1235 p->flags = u->flags; 1236 p->hop_limit = u->hop_limit; 1237 p->encap_limit = u->encap_limit; 1238 p->flowinfo = u->flowinfo; 1239 p->link = u->link; 1240 p->i_key = u->i_key; 1241 p->o_key = u->o_key; 1242 p->i_flags = gre_flags_to_tnl_flags(u->i_flags); 1243 p->o_flags = gre_flags_to_tnl_flags(u->o_flags); 1244 memcpy(p->name, u->name, sizeof(u->name)); 1245} 1246 1247static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u, 1248 const struct __ip6_tnl_parm *p) 1249{ 1250 u->proto = IPPROTO_GRE; 1251 u->laddr = p->laddr; 1252 u->raddr = p->raddr; 1253 u->flags = p->flags; 1254 u->hop_limit = p->hop_limit; 1255 u->encap_limit = p->encap_limit; 1256 u->flowinfo = p->flowinfo; 1257 u->link = p->link; 1258 u->i_key = p->i_key; 1259 u->o_key = p->o_key; 1260 u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags); 1261 u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags); 1262 memcpy(u->name, p->name, sizeof(u->name)); 1263} 1264 1265static int ip6gre_tunnel_ioctl(struct net_device *dev, 1266 struct ifreq *ifr, int cmd) 1267{ 1268 int err = 0; 1269 struct ip6_tnl_parm2 p; 1270 struct __ip6_tnl_parm p1; 1271 struct ip6_tnl *t = netdev_priv(dev); 1272 struct net *net = t->net; 1273 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1274 1275 memset(&p1, 0, sizeof(p1)); 1276 1277 switch (cmd) { 1278 case SIOCGETTUNNEL: 1279 if (dev == ign->fb_tunnel_dev) { 1280 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { 1281 err = -EFAULT; 1282 break; 1283 } 1284 ip6gre_tnl_parm_from_user(&p1, &p); 1285 t = ip6gre_tunnel_locate(net, &p1, 0); 1286 if (!t) 1287 t = netdev_priv(dev); 1288 } 1289 memset(&p, 0, sizeof(p)); 1290 ip6gre_tnl_parm_to_user(&p, &t->parms); 1291 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) 1292 err = -EFAULT; 1293 break; 1294 1295 case SIOCADDTUNNEL: 1296 case SIOCCHGTUNNEL: 1297 err = -EPERM; 1298 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1299 goto done; 1300 1301 err = -EFAULT; 1302 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 1303 goto done; 1304 1305 err = -EINVAL; 1306 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING)) 1307 goto done; 1308 1309 if (!(p.i_flags&GRE_KEY)) 1310 p.i_key = 0; 1311 if (!(p.o_flags&GRE_KEY)) 1312 p.o_key = 0; 1313 1314 ip6gre_tnl_parm_from_user(&p1, &p); 1315 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL); 1316 1317 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { 1318 if (t) { 1319 if (t->dev != dev) { 1320 err = -EEXIST; 1321 break; 1322 } 1323 } else { 1324 t = netdev_priv(dev); 1325 1326 ip6gre_tunnel_unlink(ign, t); 1327 synchronize_net(); 1328 ip6gre_tnl_change(t, &p1, 1); 1329 ip6gre_tunnel_link(ign, t); 1330 netdev_state_change(dev); 1331 } 1332 } 1333 1334 if (t) { 1335 err = 0; 1336 1337 memset(&p, 0, sizeof(p)); 1338 ip6gre_tnl_parm_to_user(&p, &t->parms); 1339 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) 1340 err = -EFAULT; 1341 } else 1342 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); 1343 break; 1344 1345 case SIOCDELTUNNEL: 1346 err = -EPERM; 1347 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1348 goto done; 1349 1350 if (dev == ign->fb_tunnel_dev) { 1351 err = -EFAULT; 1352 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 1353 goto done; 1354 err = -ENOENT; 1355 ip6gre_tnl_parm_from_user(&p1, &p); 1356 t = ip6gre_tunnel_locate(net, &p1, 0); 1357 if (!t) 1358 goto done; 1359 err = -EPERM; 1360 if (t == netdev_priv(ign->fb_tunnel_dev)) 1361 goto done; 1362 dev = t->dev; 1363 } 1364 unregister_netdevice(dev); 1365 err = 0; 1366 break; 1367 1368 default: 1369 err = -EINVAL; 1370 } 1371 1372done: 1373 return err; 1374} 1375 1376static int ip6gre_header(struct sk_buff *skb, struct net_device *dev, 1377 unsigned short type, const void *daddr, 1378 const void *saddr, unsigned int len) 1379{ 1380 struct ip6_tnl *t = netdev_priv(dev); 1381 struct ipv6hdr *ipv6h; 1382 __be16 *p; 1383 1384 ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h)); 1385 ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb, 1386 t->fl.u.ip6.flowlabel, 1387 true, &t->fl.u.ip6)); 1388 ipv6h->hop_limit = t->parms.hop_limit; 1389 ipv6h->nexthdr = NEXTHDR_GRE; 1390 ipv6h->saddr = t->parms.laddr; 1391 ipv6h->daddr = t->parms.raddr; 1392 1393 p = (__be16 *)(ipv6h + 1); 1394 p[0] = t->parms.o_flags; 1395 p[1] = htons(type); 1396 1397 /* 1398 * Set the source hardware address. 1399 */ 1400 1401 if (saddr) 1402 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr)); 1403 if (daddr) 1404 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr)); 1405 if (!ipv6_addr_any(&ipv6h->daddr)) 1406 return t->hlen; 1407 1408 return -t->hlen; 1409} 1410 1411static const struct header_ops ip6gre_header_ops = { 1412 .create = ip6gre_header, 1413}; 1414 1415static const struct net_device_ops ip6gre_netdev_ops = { 1416 .ndo_init = ip6gre_tunnel_init, 1417 .ndo_uninit = ip6gre_tunnel_uninit, 1418 .ndo_start_xmit = ip6gre_tunnel_xmit, 1419 .ndo_do_ioctl = ip6gre_tunnel_ioctl, 1420 .ndo_change_mtu = ip6_tnl_change_mtu, 1421 .ndo_get_stats64 = ip_tunnel_get_stats64, 1422 .ndo_get_iflink = ip6_tnl_get_iflink, 1423}; 1424 1425static void ip6gre_dev_free(struct net_device *dev) 1426{ 1427 struct ip6_tnl *t = netdev_priv(dev); 1428 1429 gro_cells_destroy(&t->gro_cells); 1430 dst_cache_destroy(&t->dst_cache); 1431 free_percpu(dev->tstats); 1432} 1433 1434static void ip6gre_tunnel_setup(struct net_device *dev) 1435{ 1436 dev->netdev_ops = &ip6gre_netdev_ops; 1437 dev->needs_free_netdev = true; 1438 dev->priv_destructor = ip6gre_dev_free; 1439 1440 dev->type = ARPHRD_IP6GRE; 1441 1442 dev->flags |= IFF_NOARP; 1443 dev->addr_len = sizeof(struct in6_addr); 1444 netif_keep_dst(dev); 1445 /* This perm addr will be used as interface identifier by IPv6 */ 1446 dev->addr_assign_type = NET_ADDR_RANDOM; 1447 eth_random_addr(dev->perm_addr); 1448} 1449 1450#define GRE6_FEATURES (NETIF_F_SG | \ 1451 NETIF_F_FRAGLIST | \ 1452 NETIF_F_HIGHDMA | \ 1453 NETIF_F_HW_CSUM) 1454 1455static void ip6gre_tnl_init_features(struct net_device *dev) 1456{ 1457 struct ip6_tnl *nt = netdev_priv(dev); 1458 1459 dev->features |= GRE6_FEATURES; 1460 dev->hw_features |= GRE6_FEATURES; 1461 1462 if (!(nt->parms.o_flags & TUNNEL_SEQ)) { 1463 /* TCP offload with GRE SEQ is not supported, nor 1464 * can we support 2 levels of outer headers requiring 1465 * an update. 1466 */ 1467 if (!(nt->parms.o_flags & TUNNEL_CSUM) || 1468 nt->encap.type == TUNNEL_ENCAP_NONE) { 1469 dev->features |= NETIF_F_GSO_SOFTWARE; 1470 dev->hw_features |= NETIF_F_GSO_SOFTWARE; 1471 } 1472 1473 /* Can use a lockless transmit, unless we generate 1474 * output sequences 1475 */ 1476 dev->features |= NETIF_F_LLTX; 1477 } 1478} 1479 1480static int ip6gre_tunnel_init_common(struct net_device *dev) 1481{ 1482 struct ip6_tnl *tunnel; 1483 int ret; 1484 int t_hlen; 1485 1486 tunnel = netdev_priv(dev); 1487 1488 tunnel->dev = dev; 1489 tunnel->net = dev_net(dev); 1490 strcpy(tunnel->parms.name, dev->name); 1491 1492 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 1493 if (!dev->tstats) 1494 return -ENOMEM; 1495 1496 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); 1497 if (ret) 1498 goto cleanup_alloc_pcpu_stats; 1499 1500 ret = gro_cells_init(&tunnel->gro_cells, dev); 1501 if (ret) 1502 goto cleanup_dst_cache_init; 1503 1504 t_hlen = ip6gre_calc_hlen(tunnel); 1505 dev->mtu = ETH_DATA_LEN - t_hlen; 1506 if (dev->type == ARPHRD_ETHER) 1507 dev->mtu -= ETH_HLEN; 1508 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1509 dev->mtu -= 8; 1510 1511 if (tunnel->parms.collect_md) { 1512 netif_keep_dst(dev); 1513 } 1514 ip6gre_tnl_init_features(dev); 1515 1516 dev_hold(dev); 1517 return 0; 1518 1519cleanup_dst_cache_init: 1520 dst_cache_destroy(&tunnel->dst_cache); 1521cleanup_alloc_pcpu_stats: 1522 free_percpu(dev->tstats); 1523 dev->tstats = NULL; 1524 return ret; 1525} 1526 1527static int ip6gre_tunnel_init(struct net_device *dev) 1528{ 1529 struct ip6_tnl *tunnel; 1530 int ret; 1531 1532 ret = ip6gre_tunnel_init_common(dev); 1533 if (ret) 1534 return ret; 1535 1536 tunnel = netdev_priv(dev); 1537 1538 if (tunnel->parms.collect_md) 1539 return 0; 1540 1541 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr)); 1542 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr)); 1543 1544 if (ipv6_addr_any(&tunnel->parms.raddr)) 1545 dev->header_ops = &ip6gre_header_ops; 1546 1547 return 0; 1548} 1549 1550static void ip6gre_fb_tunnel_init(struct net_device *dev) 1551{ 1552 struct ip6_tnl *tunnel = netdev_priv(dev); 1553 1554 tunnel->dev = dev; 1555 tunnel->net = dev_net(dev); 1556 strcpy(tunnel->parms.name, dev->name); 1557 1558 tunnel->hlen = sizeof(struct ipv6hdr) + 4; 1559} 1560 1561static struct inet6_protocol ip6gre_protocol __read_mostly = { 1562 .handler = gre_rcv, 1563 .err_handler = ip6gre_err, 1564 .flags = INET6_PROTO_FINAL, 1565}; 1566 1567static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head) 1568{ 1569 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1570 struct net_device *dev, *aux; 1571 int prio; 1572 1573 for_each_netdev_safe(net, dev, aux) 1574 if (dev->rtnl_link_ops == &ip6gre_link_ops || 1575 dev->rtnl_link_ops == &ip6gre_tap_ops || 1576 dev->rtnl_link_ops == &ip6erspan_tap_ops) 1577 unregister_netdevice_queue(dev, head); 1578 1579 for (prio = 0; prio < 4; prio++) { 1580 int h; 1581 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) { 1582 struct ip6_tnl *t; 1583 1584 t = rtnl_dereference(ign->tunnels[prio][h]); 1585 1586 while (t) { 1587 /* If dev is in the same netns, it has already 1588 * been added to the list by the previous loop. 1589 */ 1590 if (!net_eq(dev_net(t->dev), net)) 1591 unregister_netdevice_queue(t->dev, 1592 head); 1593 t = rtnl_dereference(t->next); 1594 } 1595 } 1596 } 1597} 1598 1599static int __net_init ip6gre_init_net(struct net *net) 1600{ 1601 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1602 struct net_device *ndev; 1603 int err; 1604 1605 if (!net_has_fallback_tunnels(net)) 1606 return 0; 1607 ndev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0", 1608 NET_NAME_UNKNOWN, ip6gre_tunnel_setup); 1609 if (!ndev) { 1610 err = -ENOMEM; 1611 goto err_alloc_dev; 1612 } 1613 ign->fb_tunnel_dev = ndev; 1614 dev_net_set(ign->fb_tunnel_dev, net); 1615 /* FB netdevice is special: we have one, and only one per netns. 1616 * Allowing to move it to another netns is clearly unsafe. 1617 */ 1618 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL; 1619 1620 1621 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev); 1622 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops; 1623 1624 err = register_netdev(ign->fb_tunnel_dev); 1625 if (err) 1626 goto err_reg_dev; 1627 1628 rcu_assign_pointer(ign->tunnels_wc[0], 1629 netdev_priv(ign->fb_tunnel_dev)); 1630 return 0; 1631 1632err_reg_dev: 1633 free_netdev(ndev); 1634err_alloc_dev: 1635 return err; 1636} 1637 1638static void __net_exit ip6gre_exit_batch_net(struct list_head *net_list) 1639{ 1640 struct net *net; 1641 LIST_HEAD(list); 1642 1643 rtnl_lock(); 1644 list_for_each_entry(net, net_list, exit_list) 1645 ip6gre_destroy_tunnels(net, &list); 1646 unregister_netdevice_many(&list); 1647 rtnl_unlock(); 1648} 1649 1650static struct pernet_operations ip6gre_net_ops = { 1651 .init = ip6gre_init_net, 1652 .exit_batch = ip6gre_exit_batch_net, 1653 .id = &ip6gre_net_id, 1654 .size = sizeof(struct ip6gre_net), 1655}; 1656 1657static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[], 1658 struct netlink_ext_ack *extack) 1659{ 1660 __be16 flags; 1661 1662 if (!data) 1663 return 0; 1664 1665 flags = 0; 1666 if (data[IFLA_GRE_IFLAGS]) 1667 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); 1668 if (data[IFLA_GRE_OFLAGS]) 1669 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); 1670 if (flags & (GRE_VERSION|GRE_ROUTING)) 1671 return -EINVAL; 1672 1673 return 0; 1674} 1675 1676static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[], 1677 struct netlink_ext_ack *extack) 1678{ 1679 struct in6_addr daddr; 1680 1681 if (tb[IFLA_ADDRESS]) { 1682 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 1683 return -EINVAL; 1684 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 1685 return -EADDRNOTAVAIL; 1686 } 1687 1688 if (!data) 1689 goto out; 1690 1691 if (data[IFLA_GRE_REMOTE]) { 1692 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]); 1693 if (ipv6_addr_any(&daddr)) 1694 return -EINVAL; 1695 } 1696 1697out: 1698 return ip6gre_tunnel_validate(tb, data, extack); 1699} 1700 1701static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[], 1702 struct netlink_ext_ack *extack) 1703{ 1704 __be16 flags = 0; 1705 int ret, ver = 0; 1706 1707 if (!data) 1708 return 0; 1709 1710 ret = ip6gre_tap_validate(tb, data, extack); 1711 if (ret) 1712 return ret; 1713 1714 /* ERSPAN should only have GRE sequence and key flag */ 1715 if (data[IFLA_GRE_OFLAGS]) 1716 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); 1717 if (data[IFLA_GRE_IFLAGS]) 1718 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); 1719 if (!data[IFLA_GRE_COLLECT_METADATA] && 1720 flags != (GRE_SEQ | GRE_KEY)) 1721 return -EINVAL; 1722 1723 /* ERSPAN Session ID only has 10-bit. Since we reuse 1724 * 32-bit key field as ID, check it's range. 1725 */ 1726 if (data[IFLA_GRE_IKEY] && 1727 (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK)) 1728 return -EINVAL; 1729 1730 if (data[IFLA_GRE_OKEY] && 1731 (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK)) 1732 return -EINVAL; 1733 1734 if (data[IFLA_GRE_ERSPAN_VER]) { 1735 ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]); 1736 if (ver != 1 && ver != 2) 1737 return -EINVAL; 1738 } 1739 1740 if (ver == 1) { 1741 if (data[IFLA_GRE_ERSPAN_INDEX]) { 1742 u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]); 1743 1744 if (index & ~INDEX_MASK) 1745 return -EINVAL; 1746 } 1747 } else if (ver == 2) { 1748 if (data[IFLA_GRE_ERSPAN_DIR]) { 1749 u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]); 1750 1751 if (dir & ~(DIR_MASK >> DIR_OFFSET)) 1752 return -EINVAL; 1753 } 1754 1755 if (data[IFLA_GRE_ERSPAN_HWID]) { 1756 u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]); 1757 1758 if (hwid & ~(HWID_MASK >> HWID_OFFSET)) 1759 return -EINVAL; 1760 } 1761 } 1762 1763 return 0; 1764} 1765 1766static void ip6erspan_set_version(struct nlattr *data[], 1767 struct __ip6_tnl_parm *parms) 1768{ 1769 if (!data) 1770 return; 1771 1772 parms->erspan_ver = 1; 1773 if (data[IFLA_GRE_ERSPAN_VER]) 1774 parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]); 1775 1776 if (parms->erspan_ver == 1) { 1777 if (data[IFLA_GRE_ERSPAN_INDEX]) 1778 parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]); 1779 } else if (parms->erspan_ver == 2) { 1780 if (data[IFLA_GRE_ERSPAN_DIR]) 1781 parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]); 1782 if (data[IFLA_GRE_ERSPAN_HWID]) 1783 parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]); 1784 } 1785} 1786 1787static void ip6gre_netlink_parms(struct nlattr *data[], 1788 struct __ip6_tnl_parm *parms) 1789{ 1790 memset(parms, 0, sizeof(*parms)); 1791 1792 if (!data) 1793 return; 1794 1795 if (data[IFLA_GRE_LINK]) 1796 parms->link = nla_get_u32(data[IFLA_GRE_LINK]); 1797 1798 if (data[IFLA_GRE_IFLAGS]) 1799 parms->i_flags = gre_flags_to_tnl_flags( 1800 nla_get_be16(data[IFLA_GRE_IFLAGS])); 1801 1802 if (data[IFLA_GRE_OFLAGS]) 1803 parms->o_flags = gre_flags_to_tnl_flags( 1804 nla_get_be16(data[IFLA_GRE_OFLAGS])); 1805 1806 if (data[IFLA_GRE_IKEY]) 1807 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]); 1808 1809 if (data[IFLA_GRE_OKEY]) 1810 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]); 1811 1812 if (data[IFLA_GRE_LOCAL]) 1813 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]); 1814 1815 if (data[IFLA_GRE_REMOTE]) 1816 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]); 1817 1818 if (data[IFLA_GRE_TTL]) 1819 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]); 1820 1821 if (data[IFLA_GRE_ENCAP_LIMIT]) 1822 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]); 1823 1824 if (data[IFLA_GRE_FLOWINFO]) 1825 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]); 1826 1827 if (data[IFLA_GRE_FLAGS]) 1828 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]); 1829 1830 if (data[IFLA_GRE_FWMARK]) 1831 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]); 1832 1833 if (data[IFLA_GRE_COLLECT_METADATA]) 1834 parms->collect_md = true; 1835} 1836 1837static int ip6gre_tap_init(struct net_device *dev) 1838{ 1839 int ret; 1840 1841 ret = ip6gre_tunnel_init_common(dev); 1842 if (ret) 1843 return ret; 1844 1845 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 1846 1847 return 0; 1848} 1849 1850static const struct net_device_ops ip6gre_tap_netdev_ops = { 1851 .ndo_init = ip6gre_tap_init, 1852 .ndo_uninit = ip6gre_tunnel_uninit, 1853 .ndo_start_xmit = ip6gre_tunnel_xmit, 1854 .ndo_set_mac_address = eth_mac_addr, 1855 .ndo_validate_addr = eth_validate_addr, 1856 .ndo_change_mtu = ip6_tnl_change_mtu, 1857 .ndo_get_stats64 = ip_tunnel_get_stats64, 1858 .ndo_get_iflink = ip6_tnl_get_iflink, 1859}; 1860 1861static int ip6erspan_calc_hlen(struct ip6_tnl *tunnel) 1862{ 1863 int t_hlen; 1864 1865 tunnel->tun_hlen = 8; 1866 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen + 1867 erspan_hdr_len(tunnel->parms.erspan_ver); 1868 1869 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr); 1870 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen; 1871 return t_hlen; 1872} 1873 1874static int ip6erspan_tap_init(struct net_device *dev) 1875{ 1876 struct ip6_tnl *tunnel; 1877 int t_hlen; 1878 int ret; 1879 1880 tunnel = netdev_priv(dev); 1881 1882 tunnel->dev = dev; 1883 tunnel->net = dev_net(dev); 1884 strcpy(tunnel->parms.name, dev->name); 1885 1886 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 1887 if (!dev->tstats) 1888 return -ENOMEM; 1889 1890 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); 1891 if (ret) 1892 goto cleanup_alloc_pcpu_stats; 1893 1894 ret = gro_cells_init(&tunnel->gro_cells, dev); 1895 if (ret) 1896 goto cleanup_dst_cache_init; 1897 1898 t_hlen = ip6erspan_calc_hlen(tunnel); 1899 dev->mtu = ETH_DATA_LEN - t_hlen; 1900 if (dev->type == ARPHRD_ETHER) 1901 dev->mtu -= ETH_HLEN; 1902 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1903 dev->mtu -= 8; 1904 1905 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 1906 ip6erspan_tnl_link_config(tunnel, 1); 1907 1908 dev_hold(dev); 1909 return 0; 1910 1911cleanup_dst_cache_init: 1912 dst_cache_destroy(&tunnel->dst_cache); 1913cleanup_alloc_pcpu_stats: 1914 free_percpu(dev->tstats); 1915 dev->tstats = NULL; 1916 return ret; 1917} 1918 1919static const struct net_device_ops ip6erspan_netdev_ops = { 1920 .ndo_init = ip6erspan_tap_init, 1921 .ndo_uninit = ip6erspan_tunnel_uninit, 1922 .ndo_start_xmit = ip6erspan_tunnel_xmit, 1923 .ndo_set_mac_address = eth_mac_addr, 1924 .ndo_validate_addr = eth_validate_addr, 1925 .ndo_change_mtu = ip6_tnl_change_mtu, 1926 .ndo_get_stats64 = ip_tunnel_get_stats64, 1927 .ndo_get_iflink = ip6_tnl_get_iflink, 1928}; 1929 1930static void ip6gre_tap_setup(struct net_device *dev) 1931{ 1932 1933 ether_setup(dev); 1934 1935 dev->max_mtu = 0; 1936 dev->netdev_ops = &ip6gre_tap_netdev_ops; 1937 dev->needs_free_netdev = true; 1938 dev->priv_destructor = ip6gre_dev_free; 1939 1940 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1941 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 1942 netif_keep_dst(dev); 1943} 1944 1945static bool ip6gre_netlink_encap_parms(struct nlattr *data[], 1946 struct ip_tunnel_encap *ipencap) 1947{ 1948 bool ret = false; 1949 1950 memset(ipencap, 0, sizeof(*ipencap)); 1951 1952 if (!data) 1953 return ret; 1954 1955 if (data[IFLA_GRE_ENCAP_TYPE]) { 1956 ret = true; 1957 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]); 1958 } 1959 1960 if (data[IFLA_GRE_ENCAP_FLAGS]) { 1961 ret = true; 1962 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]); 1963 } 1964 1965 if (data[IFLA_GRE_ENCAP_SPORT]) { 1966 ret = true; 1967 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]); 1968 } 1969 1970 if (data[IFLA_GRE_ENCAP_DPORT]) { 1971 ret = true; 1972 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]); 1973 } 1974 1975 return ret; 1976} 1977 1978static int ip6gre_newlink_common(struct net *src_net, struct net_device *dev, 1979 struct nlattr *tb[], struct nlattr *data[], 1980 struct netlink_ext_ack *extack) 1981{ 1982 struct ip6_tnl *nt; 1983 struct ip_tunnel_encap ipencap; 1984 int err; 1985 1986 nt = netdev_priv(dev); 1987 1988 if (ip6gre_netlink_encap_parms(data, &ipencap)) { 1989 int err = ip6_tnl_encap_setup(nt, &ipencap); 1990 1991 if (err < 0) 1992 return err; 1993 } 1994 1995 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS]) 1996 eth_hw_addr_random(dev); 1997 1998 nt->dev = dev; 1999 nt->net = dev_net(dev); 2000 2001 err = register_netdevice(dev); 2002 if (err) 2003 goto out; 2004 2005 if (tb[IFLA_MTU]) 2006 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 2007 2008out: 2009 return err; 2010} 2011 2012static int ip6gre_newlink(struct net *src_net, struct net_device *dev, 2013 struct nlattr *tb[], struct nlattr *data[], 2014 struct netlink_ext_ack *extack) 2015{ 2016 struct ip6_tnl *nt = netdev_priv(dev); 2017 struct net *net = dev_net(dev); 2018 struct ip6gre_net *ign; 2019 int err; 2020 2021 ip6gre_netlink_parms(data, &nt->parms); 2022 ign = net_generic(net, ip6gre_net_id); 2023 2024 if (nt->parms.collect_md) { 2025 if (rtnl_dereference(ign->collect_md_tun)) 2026 return -EEXIST; 2027 } else { 2028 if (ip6gre_tunnel_find(net, &nt->parms, dev->type)) 2029 return -EEXIST; 2030 } 2031 2032 err = ip6gre_newlink_common(src_net, dev, tb, data, extack); 2033 if (!err) { 2034 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]); 2035 ip6gre_tunnel_link_md(ign, nt); 2036 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt); 2037 } 2038 return err; 2039} 2040 2041static struct ip6_tnl * 2042ip6gre_changelink_common(struct net_device *dev, struct nlattr *tb[], 2043 struct nlattr *data[], struct __ip6_tnl_parm *p_p, 2044 struct netlink_ext_ack *extack) 2045{ 2046 struct ip6_tnl *t, *nt = netdev_priv(dev); 2047 struct net *net = nt->net; 2048 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 2049 struct ip_tunnel_encap ipencap; 2050 2051 if (dev == ign->fb_tunnel_dev) 2052 return ERR_PTR(-EINVAL); 2053 2054 if (ip6gre_netlink_encap_parms(data, &ipencap)) { 2055 int err = ip6_tnl_encap_setup(nt, &ipencap); 2056 2057 if (err < 0) 2058 return ERR_PTR(err); 2059 } 2060 2061 ip6gre_netlink_parms(data, p_p); 2062 2063 t = ip6gre_tunnel_locate(net, p_p, 0); 2064 2065 if (t) { 2066 if (t->dev != dev) 2067 return ERR_PTR(-EEXIST); 2068 } else { 2069 t = nt; 2070 } 2071 2072 return t; 2073} 2074 2075static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[], 2076 struct nlattr *data[], 2077 struct netlink_ext_ack *extack) 2078{ 2079 struct ip6_tnl *t = netdev_priv(dev); 2080 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id); 2081 struct __ip6_tnl_parm p; 2082 2083 t = ip6gre_changelink_common(dev, tb, data, &p, extack); 2084 if (IS_ERR(t)) 2085 return PTR_ERR(t); 2086 2087 ip6gre_tunnel_unlink_md(ign, t); 2088 ip6gre_tunnel_unlink(ign, t); 2089 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]); 2090 ip6gre_tunnel_link_md(ign, t); 2091 ip6gre_tunnel_link(ign, t); 2092 return 0; 2093} 2094 2095static void ip6gre_dellink(struct net_device *dev, struct list_head *head) 2096{ 2097 struct net *net = dev_net(dev); 2098 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 2099 2100 if (dev != ign->fb_tunnel_dev) 2101 unregister_netdevice_queue(dev, head); 2102} 2103 2104static size_t ip6gre_get_size(const struct net_device *dev) 2105{ 2106 return 2107 /* IFLA_GRE_LINK */ 2108 nla_total_size(4) + 2109 /* IFLA_GRE_IFLAGS */ 2110 nla_total_size(2) + 2111 /* IFLA_GRE_OFLAGS */ 2112 nla_total_size(2) + 2113 /* IFLA_GRE_IKEY */ 2114 nla_total_size(4) + 2115 /* IFLA_GRE_OKEY */ 2116 nla_total_size(4) + 2117 /* IFLA_GRE_LOCAL */ 2118 nla_total_size(sizeof(struct in6_addr)) + 2119 /* IFLA_GRE_REMOTE */ 2120 nla_total_size(sizeof(struct in6_addr)) + 2121 /* IFLA_GRE_TTL */ 2122 nla_total_size(1) + 2123 /* IFLA_GRE_ENCAP_LIMIT */ 2124 nla_total_size(1) + 2125 /* IFLA_GRE_FLOWINFO */ 2126 nla_total_size(4) + 2127 /* IFLA_GRE_FLAGS */ 2128 nla_total_size(4) + 2129 /* IFLA_GRE_ENCAP_TYPE */ 2130 nla_total_size(2) + 2131 /* IFLA_GRE_ENCAP_FLAGS */ 2132 nla_total_size(2) + 2133 /* IFLA_GRE_ENCAP_SPORT */ 2134 nla_total_size(2) + 2135 /* IFLA_GRE_ENCAP_DPORT */ 2136 nla_total_size(2) + 2137 /* IFLA_GRE_COLLECT_METADATA */ 2138 nla_total_size(0) + 2139 /* IFLA_GRE_FWMARK */ 2140 nla_total_size(4) + 2141 /* IFLA_GRE_ERSPAN_INDEX */ 2142 nla_total_size(4) + 2143 0; 2144} 2145 2146static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev) 2147{ 2148 struct ip6_tnl *t = netdev_priv(dev); 2149 struct __ip6_tnl_parm *p = &t->parms; 2150 __be16 o_flags = p->o_flags; 2151 2152 if (p->erspan_ver == 1 || p->erspan_ver == 2) { 2153 if (!p->collect_md) 2154 o_flags |= TUNNEL_KEY; 2155 2156 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, p->erspan_ver)) 2157 goto nla_put_failure; 2158 2159 if (p->erspan_ver == 1) { 2160 if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index)) 2161 goto nla_put_failure; 2162 } else { 2163 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, p->dir)) 2164 goto nla_put_failure; 2165 if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, p->hwid)) 2166 goto nla_put_failure; 2167 } 2168 } 2169 2170 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) || 2171 nla_put_be16(skb, IFLA_GRE_IFLAGS, 2172 gre_tnl_flags_to_gre_flags(p->i_flags)) || 2173 nla_put_be16(skb, IFLA_GRE_OFLAGS, 2174 gre_tnl_flags_to_gre_flags(o_flags)) || 2175 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) || 2176 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) || 2177 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) || 2178 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) || 2179 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) || 2180 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) || 2181 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) || 2182 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) || 2183 nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark)) 2184 goto nla_put_failure; 2185 2186 if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE, 2187 t->encap.type) || 2188 nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT, 2189 t->encap.sport) || 2190 nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT, 2191 t->encap.dport) || 2192 nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS, 2193 t->encap.flags)) 2194 goto nla_put_failure; 2195 2196 if (p->collect_md) { 2197 if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA)) 2198 goto nla_put_failure; 2199 } 2200 2201 return 0; 2202 2203nla_put_failure: 2204 return -EMSGSIZE; 2205} 2206 2207static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = { 2208 [IFLA_GRE_LINK] = { .type = NLA_U32 }, 2209 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 }, 2210 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 }, 2211 [IFLA_GRE_IKEY] = { .type = NLA_U32 }, 2212 [IFLA_GRE_OKEY] = { .type = NLA_U32 }, 2213 [IFLA_GRE_LOCAL] = { .len = sizeof_field(struct ipv6hdr, saddr) }, 2214 [IFLA_GRE_REMOTE] = { .len = sizeof_field(struct ipv6hdr, daddr) }, 2215 [IFLA_GRE_TTL] = { .type = NLA_U8 }, 2216 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 }, 2217 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 }, 2218 [IFLA_GRE_FLAGS] = { .type = NLA_U32 }, 2219 [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 }, 2220 [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 }, 2221 [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 }, 2222 [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 }, 2223 [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG }, 2224 [IFLA_GRE_FWMARK] = { .type = NLA_U32 }, 2225 [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 }, 2226 [IFLA_GRE_ERSPAN_VER] = { .type = NLA_U8 }, 2227 [IFLA_GRE_ERSPAN_DIR] = { .type = NLA_U8 }, 2228 [IFLA_GRE_ERSPAN_HWID] = { .type = NLA_U16 }, 2229}; 2230 2231static void ip6erspan_tap_setup(struct net_device *dev) 2232{ 2233 ether_setup(dev); 2234 2235 dev->max_mtu = 0; 2236 dev->netdev_ops = &ip6erspan_netdev_ops; 2237 dev->needs_free_netdev = true; 2238 dev->priv_destructor = ip6gre_dev_free; 2239 2240 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 2241 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 2242 netif_keep_dst(dev); 2243} 2244 2245static int ip6erspan_newlink(struct net *src_net, struct net_device *dev, 2246 struct nlattr *tb[], struct nlattr *data[], 2247 struct netlink_ext_ack *extack) 2248{ 2249 struct ip6_tnl *nt = netdev_priv(dev); 2250 struct net *net = dev_net(dev); 2251 struct ip6gre_net *ign; 2252 int err; 2253 2254 ip6gre_netlink_parms(data, &nt->parms); 2255 ip6erspan_set_version(data, &nt->parms); 2256 ign = net_generic(net, ip6gre_net_id); 2257 2258 if (nt->parms.collect_md) { 2259 if (rtnl_dereference(ign->collect_md_tun_erspan)) 2260 return -EEXIST; 2261 } else { 2262 if (ip6gre_tunnel_find(net, &nt->parms, dev->type)) 2263 return -EEXIST; 2264 } 2265 2266 err = ip6gre_newlink_common(src_net, dev, tb, data, extack); 2267 if (!err) { 2268 ip6erspan_tnl_link_config(nt, !tb[IFLA_MTU]); 2269 ip6erspan_tunnel_link_md(ign, nt); 2270 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt); 2271 } 2272 return err; 2273} 2274 2275static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu) 2276{ 2277 ip6gre_tnl_link_config_common(t); 2278 ip6gre_tnl_link_config_route(t, set_mtu, ip6erspan_calc_hlen(t)); 2279} 2280 2281static int ip6erspan_tnl_change(struct ip6_tnl *t, 2282 const struct __ip6_tnl_parm *p, int set_mtu) 2283{ 2284 ip6gre_tnl_copy_tnl_parm(t, p); 2285 ip6erspan_tnl_link_config(t, set_mtu); 2286 return 0; 2287} 2288 2289static int ip6erspan_changelink(struct net_device *dev, struct nlattr *tb[], 2290 struct nlattr *data[], 2291 struct netlink_ext_ack *extack) 2292{ 2293 struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id); 2294 struct __ip6_tnl_parm p; 2295 struct ip6_tnl *t; 2296 2297 t = ip6gre_changelink_common(dev, tb, data, &p, extack); 2298 if (IS_ERR(t)) 2299 return PTR_ERR(t); 2300 2301 ip6erspan_set_version(data, &p); 2302 ip6gre_tunnel_unlink_md(ign, t); 2303 ip6gre_tunnel_unlink(ign, t); 2304 ip6erspan_tnl_change(t, &p, !tb[IFLA_MTU]); 2305 ip6erspan_tunnel_link_md(ign, t); 2306 ip6gre_tunnel_link(ign, t); 2307 return 0; 2308} 2309 2310static struct rtnl_link_ops ip6gre_link_ops __read_mostly = { 2311 .kind = "ip6gre", 2312 .maxtype = IFLA_GRE_MAX, 2313 .policy = ip6gre_policy, 2314 .priv_size = sizeof(struct ip6_tnl), 2315 .setup = ip6gre_tunnel_setup, 2316 .validate = ip6gre_tunnel_validate, 2317 .newlink = ip6gre_newlink, 2318 .changelink = ip6gre_changelink, 2319 .dellink = ip6gre_dellink, 2320 .get_size = ip6gre_get_size, 2321 .fill_info = ip6gre_fill_info, 2322 .get_link_net = ip6_tnl_get_link_net, 2323}; 2324 2325static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = { 2326 .kind = "ip6gretap", 2327 .maxtype = IFLA_GRE_MAX, 2328 .policy = ip6gre_policy, 2329 .priv_size = sizeof(struct ip6_tnl), 2330 .setup = ip6gre_tap_setup, 2331 .validate = ip6gre_tap_validate, 2332 .newlink = ip6gre_newlink, 2333 .changelink = ip6gre_changelink, 2334 .get_size = ip6gre_get_size, 2335 .fill_info = ip6gre_fill_info, 2336 .get_link_net = ip6_tnl_get_link_net, 2337}; 2338 2339static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly = { 2340 .kind = "ip6erspan", 2341 .maxtype = IFLA_GRE_MAX, 2342 .policy = ip6gre_policy, 2343 .priv_size = sizeof(struct ip6_tnl), 2344 .setup = ip6erspan_tap_setup, 2345 .validate = ip6erspan_tap_validate, 2346 .newlink = ip6erspan_newlink, 2347 .changelink = ip6erspan_changelink, 2348 .get_size = ip6gre_get_size, 2349 .fill_info = ip6gre_fill_info, 2350 .get_link_net = ip6_tnl_get_link_net, 2351}; 2352 2353/* 2354 * And now the modules code and kernel interface. 2355 */ 2356 2357static int __init ip6gre_init(void) 2358{ 2359 int err; 2360 2361 pr_info("GRE over IPv6 tunneling driver\n"); 2362 2363 err = register_pernet_device(&ip6gre_net_ops); 2364 if (err < 0) 2365 return err; 2366 2367 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE); 2368 if (err < 0) { 2369 pr_info("%s: can't add protocol\n", __func__); 2370 goto add_proto_failed; 2371 } 2372 2373 err = rtnl_link_register(&ip6gre_link_ops); 2374 if (err < 0) 2375 goto rtnl_link_failed; 2376 2377 err = rtnl_link_register(&ip6gre_tap_ops); 2378 if (err < 0) 2379 goto tap_ops_failed; 2380 2381 err = rtnl_link_register(&ip6erspan_tap_ops); 2382 if (err < 0) 2383 goto erspan_link_failed; 2384 2385out: 2386 return err; 2387 2388erspan_link_failed: 2389 rtnl_link_unregister(&ip6gre_tap_ops); 2390tap_ops_failed: 2391 rtnl_link_unregister(&ip6gre_link_ops); 2392rtnl_link_failed: 2393 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE); 2394add_proto_failed: 2395 unregister_pernet_device(&ip6gre_net_ops); 2396 goto out; 2397} 2398 2399static void __exit ip6gre_fini(void) 2400{ 2401 rtnl_link_unregister(&ip6gre_tap_ops); 2402 rtnl_link_unregister(&ip6gre_link_ops); 2403 rtnl_link_unregister(&ip6erspan_tap_ops); 2404 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE); 2405 unregister_pernet_device(&ip6gre_net_ops); 2406} 2407 2408module_init(ip6gre_init); 2409module_exit(ip6gre_fini); 2410MODULE_LICENSE("GPL"); 2411MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)"); 2412MODULE_DESCRIPTION("GRE over IPv6 tunneling device"); 2413MODULE_ALIAS_RTNL_LINK("ip6gre"); 2414MODULE_ALIAS_RTNL_LINK("ip6gretap"); 2415MODULE_ALIAS_RTNL_LINK("ip6erspan"); 2416MODULE_ALIAS_NETDEV("ip6gre0"); 2417