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 59 60 static bool log_ecn_error = true; 61 module_param(log_ecn_error, bool, 0644); 62 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); 63 64 #define IP6_GRE_HASH_SIZE_SHIFT 5 65 #define IP6_GRE_HASH_SIZE (1 << IP6_GRE_HASH_SIZE_SHIFT) 66 67 static unsigned int ip6gre_net_id __read_mostly; 68 struct ip6gre_net { 69 struct ip6_tnl __rcu *tunnels[4][IP6_GRE_HASH_SIZE]; 70 71 struct net_device *fb_tunnel_dev; 72 }; 73 74 static struct rtnl_link_ops ip6gre_link_ops __read_mostly; 75 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly; 76 static int ip6gre_tunnel_init(struct net_device *dev); 77 static void ip6gre_tunnel_setup(struct net_device *dev); 78 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t); 79 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu); 80 81 /* Tunnel hash table */ 82 83 /* 84 4 hash tables: 85 86 3: (remote,local) 87 2: (remote,*) 88 1: (*,local) 89 0: (*,*) 90 91 We require exact key match i.e. if a key is present in packet 92 it will match only tunnel with the same key; if it is not present, 93 it will match only keyless tunnel. 94 95 All keysless packets, if not matched configured keyless tunnels 96 will match fallback tunnel. 97 */ 98 99 #define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(IP6_GRE_HASH_SIZE - 1)) 100 static u32 HASH_ADDR(const struct in6_addr *addr) 101 { 102 u32 hash = ipv6_addr_hash(addr); 103 104 return hash_32(hash, IP6_GRE_HASH_SIZE_SHIFT); 105 } 106 107 #define tunnels_r_l tunnels[3] 108 #define tunnels_r tunnels[2] 109 #define tunnels_l tunnels[1] 110 #define tunnels_wc tunnels[0] 111 112 /* Given src, dst and key, find appropriate for input tunnel. */ 113 114 static struct ip6_tnl *ip6gre_tunnel_lookup(struct net_device *dev, 115 const struct in6_addr *remote, const struct in6_addr *local, 116 __be32 key, __be16 gre_proto) 117 { 118 struct net *net = dev_net(dev); 119 int link = dev->ifindex; 120 unsigned int h0 = HASH_ADDR(remote); 121 unsigned int h1 = HASH_KEY(key); 122 struct ip6_tnl *t, *cand = NULL; 123 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 124 int dev_type = (gre_proto == htons(ETH_P_TEB)) ? 125 ARPHRD_ETHER : ARPHRD_IP6GRE; 126 int score, cand_score = 4; 127 128 for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) { 129 if (!ipv6_addr_equal(local, &t->parms.laddr) || 130 !ipv6_addr_equal(remote, &t->parms.raddr) || 131 key != t->parms.i_key || 132 !(t->dev->flags & IFF_UP)) 133 continue; 134 135 if (t->dev->type != ARPHRD_IP6GRE && 136 t->dev->type != dev_type) 137 continue; 138 139 score = 0; 140 if (t->parms.link != link) 141 score |= 1; 142 if (t->dev->type != dev_type) 143 score |= 2; 144 if (score == 0) 145 return t; 146 147 if (score < cand_score) { 148 cand = t; 149 cand_score = score; 150 } 151 } 152 153 for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) { 154 if (!ipv6_addr_equal(remote, &t->parms.raddr) || 155 key != t->parms.i_key || 156 !(t->dev->flags & IFF_UP)) 157 continue; 158 159 if (t->dev->type != ARPHRD_IP6GRE && 160 t->dev->type != dev_type) 161 continue; 162 163 score = 0; 164 if (t->parms.link != link) 165 score |= 1; 166 if (t->dev->type != dev_type) 167 score |= 2; 168 if (score == 0) 169 return t; 170 171 if (score < cand_score) { 172 cand = t; 173 cand_score = score; 174 } 175 } 176 177 for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) { 178 if ((!ipv6_addr_equal(local, &t->parms.laddr) && 179 (!ipv6_addr_equal(local, &t->parms.raddr) || 180 !ipv6_addr_is_multicast(local))) || 181 key != t->parms.i_key || 182 !(t->dev->flags & IFF_UP)) 183 continue; 184 185 if (t->dev->type != ARPHRD_IP6GRE && 186 t->dev->type != dev_type) 187 continue; 188 189 score = 0; 190 if (t->parms.link != link) 191 score |= 1; 192 if (t->dev->type != dev_type) 193 score |= 2; 194 if (score == 0) 195 return t; 196 197 if (score < cand_score) { 198 cand = t; 199 cand_score = score; 200 } 201 } 202 203 for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) { 204 if (t->parms.i_key != key || 205 !(t->dev->flags & IFF_UP)) 206 continue; 207 208 if (t->dev->type != ARPHRD_IP6GRE && 209 t->dev->type != dev_type) 210 continue; 211 212 score = 0; 213 if (t->parms.link != link) 214 score |= 1; 215 if (t->dev->type != dev_type) 216 score |= 2; 217 if (score == 0) 218 return t; 219 220 if (score < cand_score) { 221 cand = t; 222 cand_score = score; 223 } 224 } 225 226 if (cand) 227 return cand; 228 229 dev = ign->fb_tunnel_dev; 230 if (dev->flags & IFF_UP) 231 return netdev_priv(dev); 232 233 return NULL; 234 } 235 236 static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign, 237 const struct __ip6_tnl_parm *p) 238 { 239 const struct in6_addr *remote = &p->raddr; 240 const struct in6_addr *local = &p->laddr; 241 unsigned int h = HASH_KEY(p->i_key); 242 int prio = 0; 243 244 if (!ipv6_addr_any(local)) 245 prio |= 1; 246 if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) { 247 prio |= 2; 248 h ^= HASH_ADDR(remote); 249 } 250 251 return &ign->tunnels[prio][h]; 252 } 253 254 static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign, 255 const struct ip6_tnl *t) 256 { 257 return __ip6gre_bucket(ign, &t->parms); 258 } 259 260 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t) 261 { 262 struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t); 263 264 rcu_assign_pointer(t->next, rtnl_dereference(*tp)); 265 rcu_assign_pointer(*tp, t); 266 } 267 268 static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t) 269 { 270 struct ip6_tnl __rcu **tp; 271 struct ip6_tnl *iter; 272 273 for (tp = ip6gre_bucket(ign, t); 274 (iter = rtnl_dereference(*tp)) != NULL; 275 tp = &iter->next) { 276 if (t == iter) { 277 rcu_assign_pointer(*tp, t->next); 278 break; 279 } 280 } 281 } 282 283 static struct ip6_tnl *ip6gre_tunnel_find(struct net *net, 284 const struct __ip6_tnl_parm *parms, 285 int type) 286 { 287 const struct in6_addr *remote = &parms->raddr; 288 const struct in6_addr *local = &parms->laddr; 289 __be32 key = parms->i_key; 290 int link = parms->link; 291 struct ip6_tnl *t; 292 struct ip6_tnl __rcu **tp; 293 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 294 295 for (tp = __ip6gre_bucket(ign, parms); 296 (t = rtnl_dereference(*tp)) != NULL; 297 tp = &t->next) 298 if (ipv6_addr_equal(local, &t->parms.laddr) && 299 ipv6_addr_equal(remote, &t->parms.raddr) && 300 key == t->parms.i_key && 301 link == t->parms.link && 302 type == t->dev->type) 303 break; 304 305 return t; 306 } 307 308 static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net, 309 const struct __ip6_tnl_parm *parms, int create) 310 { 311 struct ip6_tnl *t, *nt; 312 struct net_device *dev; 313 char name[IFNAMSIZ]; 314 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 315 316 t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE); 317 if (t && create) 318 return NULL; 319 if (t || !create) 320 return t; 321 322 if (parms->name[0]) 323 strlcpy(name, parms->name, IFNAMSIZ); 324 else 325 strcpy(name, "ip6gre%d"); 326 327 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, 328 ip6gre_tunnel_setup); 329 if (!dev) 330 return NULL; 331 332 dev_net_set(dev, net); 333 334 nt = netdev_priv(dev); 335 nt->parms = *parms; 336 dev->rtnl_link_ops = &ip6gre_link_ops; 337 338 nt->dev = dev; 339 nt->net = dev_net(dev); 340 ip6gre_tnl_link_config(nt, 1); 341 342 if (register_netdevice(dev) < 0) 343 goto failed_free; 344 345 /* Can use a lockless transmit, unless we generate output sequences */ 346 if (!(nt->parms.o_flags & TUNNEL_SEQ)) 347 dev->features |= NETIF_F_LLTX; 348 349 dev_hold(dev); 350 ip6gre_tunnel_link(ign, nt); 351 return nt; 352 353 failed_free: 354 free_netdev(dev); 355 return NULL; 356 } 357 358 static void ip6gre_tunnel_uninit(struct net_device *dev) 359 { 360 struct ip6_tnl *t = netdev_priv(dev); 361 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id); 362 363 ip6gre_tunnel_unlink(ign, t); 364 dst_cache_reset(&t->dst_cache); 365 dev_put(dev); 366 } 367 368 369 static void ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 370 u8 type, u8 code, int offset, __be32 info) 371 { 372 const struct gre_base_hdr *greh; 373 const struct ipv6hdr *ipv6h; 374 int grehlen = sizeof(*greh); 375 struct ip6_tnl *t; 376 int key_off = 0; 377 __be16 flags; 378 __be32 key; 379 380 if (!pskb_may_pull(skb, offset + grehlen)) 381 return; 382 greh = (const struct gre_base_hdr *)(skb->data + offset); 383 flags = greh->flags; 384 if (flags & (GRE_VERSION | GRE_ROUTING)) 385 return; 386 if (flags & GRE_CSUM) 387 grehlen += 4; 388 if (flags & GRE_KEY) { 389 key_off = grehlen + offset; 390 grehlen += 4; 391 } 392 393 if (!pskb_may_pull(skb, offset + grehlen)) 394 return; 395 ipv6h = (const struct ipv6hdr *)skb->data; 396 greh = (const struct gre_base_hdr *)(skb->data + offset); 397 key = key_off ? *(__be32 *)(skb->data + key_off) : 0; 398 399 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr, 400 key, greh->protocol); 401 if (!t) 402 return; 403 404 switch (type) { 405 __u32 teli; 406 struct ipv6_tlv_tnl_enc_lim *tel; 407 __u32 mtu; 408 case ICMPV6_DEST_UNREACH: 409 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n", 410 t->parms.name); 411 break; 412 case ICMPV6_TIME_EXCEED: 413 if (code == ICMPV6_EXC_HOPLIMIT) { 414 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n", 415 t->parms.name); 416 } 417 break; 418 case ICMPV6_PARAMPROB: 419 teli = 0; 420 if (code == ICMPV6_HDR_FIELD) 421 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data); 422 423 if (teli && teli == be32_to_cpu(info) - 2) { 424 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli]; 425 if (tel->encap_limit == 0) { 426 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n", 427 t->parms.name); 428 } 429 } else { 430 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n", 431 t->parms.name); 432 } 433 break; 434 case ICMPV6_PKT_TOOBIG: 435 mtu = be32_to_cpu(info) - offset; 436 if (mtu < IPV6_MIN_MTU) 437 mtu = IPV6_MIN_MTU; 438 t->dev->mtu = mtu; 439 break; 440 } 441 442 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO)) 443 t->err_count++; 444 else 445 t->err_count = 1; 446 t->err_time = jiffies; 447 } 448 449 static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi) 450 { 451 const struct ipv6hdr *ipv6h; 452 struct ip6_tnl *tunnel; 453 454 ipv6h = ipv6_hdr(skb); 455 tunnel = ip6gre_tunnel_lookup(skb->dev, 456 &ipv6h->saddr, &ipv6h->daddr, tpi->key, 457 tpi->proto); 458 if (tunnel) { 459 ip6_tnl_rcv(tunnel, skb, tpi, NULL, false); 460 461 return PACKET_RCVD; 462 } 463 464 return PACKET_REJECT; 465 } 466 467 static int gre_rcv(struct sk_buff *skb) 468 { 469 struct tnl_ptk_info tpi; 470 bool csum_err = false; 471 int hdr_len; 472 473 hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0); 474 if (hdr_len < 0) 475 goto drop; 476 477 if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false)) 478 goto drop; 479 480 if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD) 481 return 0; 482 483 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); 484 drop: 485 kfree_skb(skb); 486 return 0; 487 } 488 489 struct ipv6_tel_txoption { 490 struct ipv6_txoptions ops; 491 __u8 dst_opt[8]; 492 }; 493 494 static int gre_handle_offloads(struct sk_buff *skb, bool csum) 495 { 496 return iptunnel_handle_offloads(skb, 497 csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE); 498 } 499 500 static netdev_tx_t __gre6_xmit(struct sk_buff *skb, 501 struct net_device *dev, __u8 dsfield, 502 struct flowi6 *fl6, int encap_limit, 503 __u32 *pmtu, __be16 proto) 504 { 505 struct ip6_tnl *tunnel = netdev_priv(dev); 506 __be16 protocol = (dev->type == ARPHRD_ETHER) ? 507 htons(ETH_P_TEB) : proto; 508 509 if (dev->type == ARPHRD_ETHER) 510 IPCB(skb)->flags = 0; 511 512 if (dev->header_ops && dev->type == ARPHRD_IP6GRE) 513 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr; 514 else 515 fl6->daddr = tunnel->parms.raddr; 516 517 if (tunnel->parms.o_flags & TUNNEL_SEQ) 518 tunnel->o_seqno++; 519 520 /* Push GRE header. */ 521 gre_build_header(skb, tunnel->tun_hlen, tunnel->parms.o_flags, 522 protocol, tunnel->parms.o_key, htonl(tunnel->o_seqno)); 523 524 return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu, 525 NEXTHDR_GRE); 526 } 527 528 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev) 529 { 530 struct ip6_tnl *t = netdev_priv(dev); 531 const struct iphdr *iph = ip_hdr(skb); 532 int encap_limit = -1; 533 struct flowi6 fl6; 534 __u8 dsfield; 535 __u32 mtu; 536 int err; 537 538 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); 539 540 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 541 encap_limit = t->parms.encap_limit; 542 543 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); 544 545 dsfield = ipv4_get_dsfield(iph); 546 547 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) 548 fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT) 549 & IPV6_TCLASS_MASK; 550 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) 551 fl6.flowi6_mark = skb->mark; 552 553 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL); 554 555 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)); 556 if (err) 557 return -1; 558 559 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, 560 skb->protocol); 561 if (err != 0) { 562 /* XXX: send ICMP error even if DF is not set. */ 563 if (err == -EMSGSIZE) 564 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, 565 htonl(mtu)); 566 return -1; 567 } 568 569 return 0; 570 } 571 572 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev) 573 { 574 struct ip6_tnl *t = netdev_priv(dev); 575 struct ipv6hdr *ipv6h = ipv6_hdr(skb); 576 int encap_limit = -1; 577 __u16 offset; 578 struct flowi6 fl6; 579 __u8 dsfield; 580 __u32 mtu; 581 int err; 582 583 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr)) 584 return -1; 585 586 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb)); 587 /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */ 588 ipv6h = ipv6_hdr(skb); 589 590 if (offset > 0) { 591 struct ipv6_tlv_tnl_enc_lim *tel; 592 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset]; 593 if (tel->encap_limit == 0) { 594 icmpv6_send(skb, ICMPV6_PARAMPROB, 595 ICMPV6_HDR_FIELD, offset + 2); 596 return -1; 597 } 598 encap_limit = tel->encap_limit - 1; 599 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 600 encap_limit = t->parms.encap_limit; 601 602 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); 603 604 dsfield = ipv6_get_dsfield(ipv6h); 605 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) 606 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK); 607 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL) 608 fl6.flowlabel |= ip6_flowlabel(ipv6h); 609 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) 610 fl6.flowi6_mark = skb->mark; 611 612 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL); 613 614 if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM))) 615 return -1; 616 617 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, 618 &mtu, skb->protocol); 619 if (err != 0) { 620 if (err == -EMSGSIZE) 621 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 622 return -1; 623 } 624 625 return 0; 626 } 627 628 /** 629 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own 630 * @t: the outgoing tunnel device 631 * @hdr: IPv6 header from the incoming packet 632 * 633 * Description: 634 * Avoid trivial tunneling loop by checking that tunnel exit-point 635 * doesn't match source of incoming packet. 636 * 637 * Return: 638 * 1 if conflict, 639 * 0 else 640 **/ 641 642 static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t, 643 const struct ipv6hdr *hdr) 644 { 645 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); 646 } 647 648 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev) 649 { 650 struct ip6_tnl *t = netdev_priv(dev); 651 int encap_limit = -1; 652 struct flowi6 fl6; 653 __u32 mtu; 654 int err; 655 656 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 657 encap_limit = t->parms.encap_limit; 658 659 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); 660 661 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)); 662 if (err) 663 return err; 664 665 err = __gre6_xmit(skb, dev, 0, &fl6, encap_limit, &mtu, skb->protocol); 666 667 return err; 668 } 669 670 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb, 671 struct net_device *dev) 672 { 673 struct ip6_tnl *t = netdev_priv(dev); 674 struct net_device_stats *stats = &t->dev->stats; 675 int ret; 676 677 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr)) 678 goto tx_err; 679 680 switch (skb->protocol) { 681 case htons(ETH_P_IP): 682 ret = ip6gre_xmit_ipv4(skb, dev); 683 break; 684 case htons(ETH_P_IPV6): 685 ret = ip6gre_xmit_ipv6(skb, dev); 686 break; 687 default: 688 ret = ip6gre_xmit_other(skb, dev); 689 break; 690 } 691 692 if (ret < 0) 693 goto tx_err; 694 695 return NETDEV_TX_OK; 696 697 tx_err: 698 stats->tx_errors++; 699 stats->tx_dropped++; 700 kfree_skb(skb); 701 return NETDEV_TX_OK; 702 } 703 704 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu) 705 { 706 struct net_device *dev = t->dev; 707 struct __ip6_tnl_parm *p = &t->parms; 708 struct flowi6 *fl6 = &t->fl.u.ip6; 709 int t_hlen; 710 711 if (dev->type != ARPHRD_ETHER) { 712 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); 713 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); 714 } 715 716 /* Set up flowi template */ 717 fl6->saddr = p->laddr; 718 fl6->daddr = p->raddr; 719 fl6->flowi6_oif = p->link; 720 fl6->flowlabel = 0; 721 fl6->flowi6_proto = IPPROTO_GRE; 722 723 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) 724 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; 725 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) 726 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; 727 728 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET); 729 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr); 730 731 if (p->flags&IP6_TNL_F_CAP_XMIT && 732 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER) 733 dev->flags |= IFF_POINTOPOINT; 734 else 735 dev->flags &= ~IFF_POINTOPOINT; 736 737 t->tun_hlen = gre_calc_hlen(t->parms.o_flags); 738 739 t->hlen = t->encap_hlen + t->tun_hlen; 740 741 t_hlen = t->hlen + sizeof(struct ipv6hdr); 742 743 if (p->flags & IP6_TNL_F_CAP_XMIT) { 744 int strict = (ipv6_addr_type(&p->raddr) & 745 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); 746 747 struct rt6_info *rt = rt6_lookup(t->net, 748 &p->raddr, &p->laddr, 749 p->link, strict); 750 751 if (!rt) 752 return; 753 754 if (rt->dst.dev) { 755 dev->hard_header_len = rt->dst.dev->hard_header_len + 756 t_hlen; 757 758 if (set_mtu) { 759 dev->mtu = rt->dst.dev->mtu - t_hlen; 760 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 761 dev->mtu -= 8; 762 if (dev->type == ARPHRD_ETHER) 763 dev->mtu -= ETH_HLEN; 764 765 if (dev->mtu < IPV6_MIN_MTU) 766 dev->mtu = IPV6_MIN_MTU; 767 } 768 } 769 ip6_rt_put(rt); 770 } 771 } 772 773 static int ip6gre_tnl_change(struct ip6_tnl *t, 774 const struct __ip6_tnl_parm *p, int set_mtu) 775 { 776 t->parms.laddr = p->laddr; 777 t->parms.raddr = p->raddr; 778 t->parms.flags = p->flags; 779 t->parms.hop_limit = p->hop_limit; 780 t->parms.encap_limit = p->encap_limit; 781 t->parms.flowinfo = p->flowinfo; 782 t->parms.link = p->link; 783 t->parms.proto = p->proto; 784 t->parms.i_key = p->i_key; 785 t->parms.o_key = p->o_key; 786 t->parms.i_flags = p->i_flags; 787 t->parms.o_flags = p->o_flags; 788 dst_cache_reset(&t->dst_cache); 789 ip6gre_tnl_link_config(t, set_mtu); 790 return 0; 791 } 792 793 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p, 794 const struct ip6_tnl_parm2 *u) 795 { 796 p->laddr = u->laddr; 797 p->raddr = u->raddr; 798 p->flags = u->flags; 799 p->hop_limit = u->hop_limit; 800 p->encap_limit = u->encap_limit; 801 p->flowinfo = u->flowinfo; 802 p->link = u->link; 803 p->i_key = u->i_key; 804 p->o_key = u->o_key; 805 p->i_flags = gre_flags_to_tnl_flags(u->i_flags); 806 p->o_flags = gre_flags_to_tnl_flags(u->o_flags); 807 memcpy(p->name, u->name, sizeof(u->name)); 808 } 809 810 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u, 811 const struct __ip6_tnl_parm *p) 812 { 813 u->proto = IPPROTO_GRE; 814 u->laddr = p->laddr; 815 u->raddr = p->raddr; 816 u->flags = p->flags; 817 u->hop_limit = p->hop_limit; 818 u->encap_limit = p->encap_limit; 819 u->flowinfo = p->flowinfo; 820 u->link = p->link; 821 u->i_key = p->i_key; 822 u->o_key = p->o_key; 823 u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags); 824 u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags); 825 memcpy(u->name, p->name, sizeof(u->name)); 826 } 827 828 static int ip6gre_tunnel_ioctl(struct net_device *dev, 829 struct ifreq *ifr, int cmd) 830 { 831 int err = 0; 832 struct ip6_tnl_parm2 p; 833 struct __ip6_tnl_parm p1; 834 struct ip6_tnl *t = netdev_priv(dev); 835 struct net *net = t->net; 836 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 837 838 memset(&p1, 0, sizeof(p1)); 839 840 switch (cmd) { 841 case SIOCGETTUNNEL: 842 if (dev == ign->fb_tunnel_dev) { 843 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { 844 err = -EFAULT; 845 break; 846 } 847 ip6gre_tnl_parm_from_user(&p1, &p); 848 t = ip6gre_tunnel_locate(net, &p1, 0); 849 if (!t) 850 t = netdev_priv(dev); 851 } 852 memset(&p, 0, sizeof(p)); 853 ip6gre_tnl_parm_to_user(&p, &t->parms); 854 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) 855 err = -EFAULT; 856 break; 857 858 case SIOCADDTUNNEL: 859 case SIOCCHGTUNNEL: 860 err = -EPERM; 861 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 862 goto done; 863 864 err = -EFAULT; 865 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 866 goto done; 867 868 err = -EINVAL; 869 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING)) 870 goto done; 871 872 if (!(p.i_flags&GRE_KEY)) 873 p.i_key = 0; 874 if (!(p.o_flags&GRE_KEY)) 875 p.o_key = 0; 876 877 ip6gre_tnl_parm_from_user(&p1, &p); 878 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL); 879 880 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { 881 if (t) { 882 if (t->dev != dev) { 883 err = -EEXIST; 884 break; 885 } 886 } else { 887 t = netdev_priv(dev); 888 889 ip6gre_tunnel_unlink(ign, t); 890 synchronize_net(); 891 ip6gre_tnl_change(t, &p1, 1); 892 ip6gre_tunnel_link(ign, t); 893 netdev_state_change(dev); 894 } 895 } 896 897 if (t) { 898 err = 0; 899 900 memset(&p, 0, sizeof(p)); 901 ip6gre_tnl_parm_to_user(&p, &t->parms); 902 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) 903 err = -EFAULT; 904 } else 905 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); 906 break; 907 908 case SIOCDELTUNNEL: 909 err = -EPERM; 910 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 911 goto done; 912 913 if (dev == ign->fb_tunnel_dev) { 914 err = -EFAULT; 915 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 916 goto done; 917 err = -ENOENT; 918 ip6gre_tnl_parm_from_user(&p1, &p); 919 t = ip6gre_tunnel_locate(net, &p1, 0); 920 if (!t) 921 goto done; 922 err = -EPERM; 923 if (t == netdev_priv(ign->fb_tunnel_dev)) 924 goto done; 925 dev = t->dev; 926 } 927 unregister_netdevice(dev); 928 err = 0; 929 break; 930 931 default: 932 err = -EINVAL; 933 } 934 935 done: 936 return err; 937 } 938 939 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev, 940 unsigned short type, 941 const void *daddr, const void *saddr, unsigned int len) 942 { 943 struct ip6_tnl *t = netdev_priv(dev); 944 struct ipv6hdr *ipv6h = (struct ipv6hdr *)skb_push(skb, t->hlen); 945 __be16 *p = (__be16 *)(ipv6h+1); 946 947 ip6_flow_hdr(ipv6h, 0, 948 ip6_make_flowlabel(dev_net(dev), skb, 949 t->fl.u.ip6.flowlabel, true, 950 &t->fl.u.ip6)); 951 ipv6h->hop_limit = t->parms.hop_limit; 952 ipv6h->nexthdr = NEXTHDR_GRE; 953 ipv6h->saddr = t->parms.laddr; 954 ipv6h->daddr = t->parms.raddr; 955 956 p[0] = t->parms.o_flags; 957 p[1] = htons(type); 958 959 /* 960 * Set the source hardware address. 961 */ 962 963 if (saddr) 964 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr)); 965 if (daddr) 966 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr)); 967 if (!ipv6_addr_any(&ipv6h->daddr)) 968 return t->hlen; 969 970 return -t->hlen; 971 } 972 973 static const struct header_ops ip6gre_header_ops = { 974 .create = ip6gre_header, 975 }; 976 977 static const struct net_device_ops ip6gre_netdev_ops = { 978 .ndo_init = ip6gre_tunnel_init, 979 .ndo_uninit = ip6gre_tunnel_uninit, 980 .ndo_start_xmit = ip6gre_tunnel_xmit, 981 .ndo_do_ioctl = ip6gre_tunnel_ioctl, 982 .ndo_change_mtu = ip6_tnl_change_mtu, 983 .ndo_get_stats64 = ip_tunnel_get_stats64, 984 .ndo_get_iflink = ip6_tnl_get_iflink, 985 }; 986 987 static void ip6gre_dev_free(struct net_device *dev) 988 { 989 struct ip6_tnl *t = netdev_priv(dev); 990 991 dst_cache_destroy(&t->dst_cache); 992 free_percpu(dev->tstats); 993 free_netdev(dev); 994 } 995 996 static void ip6gre_tunnel_setup(struct net_device *dev) 997 { 998 dev->netdev_ops = &ip6gre_netdev_ops; 999 dev->destructor = ip6gre_dev_free; 1000 1001 dev->type = ARPHRD_IP6GRE; 1002 1003 dev->flags |= IFF_NOARP; 1004 dev->addr_len = sizeof(struct in6_addr); 1005 netif_keep_dst(dev); 1006 } 1007 1008 static int ip6gre_tunnel_init_common(struct net_device *dev) 1009 { 1010 struct ip6_tnl *tunnel; 1011 int ret; 1012 int t_hlen; 1013 1014 tunnel = netdev_priv(dev); 1015 1016 tunnel->dev = dev; 1017 tunnel->net = dev_net(dev); 1018 strcpy(tunnel->parms.name, dev->name); 1019 1020 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 1021 if (!dev->tstats) 1022 return -ENOMEM; 1023 1024 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); 1025 if (ret) { 1026 free_percpu(dev->tstats); 1027 dev->tstats = NULL; 1028 return ret; 1029 } 1030 1031 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags); 1032 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen; 1033 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr); 1034 1035 dev->hard_header_len = LL_MAX_HEADER + t_hlen; 1036 dev->mtu = ETH_DATA_LEN - t_hlen; 1037 if (dev->type == ARPHRD_ETHER) 1038 dev->mtu -= ETH_HLEN; 1039 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1040 dev->mtu -= 8; 1041 1042 return 0; 1043 } 1044 1045 static int ip6gre_tunnel_init(struct net_device *dev) 1046 { 1047 struct ip6_tnl *tunnel; 1048 int ret; 1049 1050 ret = ip6gre_tunnel_init_common(dev); 1051 if (ret) 1052 return ret; 1053 1054 tunnel = netdev_priv(dev); 1055 1056 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr)); 1057 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr)); 1058 1059 if (ipv6_addr_any(&tunnel->parms.raddr)) 1060 dev->header_ops = &ip6gre_header_ops; 1061 1062 return 0; 1063 } 1064 1065 static void ip6gre_fb_tunnel_init(struct net_device *dev) 1066 { 1067 struct ip6_tnl *tunnel = netdev_priv(dev); 1068 1069 tunnel->dev = dev; 1070 tunnel->net = dev_net(dev); 1071 strcpy(tunnel->parms.name, dev->name); 1072 1073 tunnel->hlen = sizeof(struct ipv6hdr) + 4; 1074 1075 dev_hold(dev); 1076 } 1077 1078 1079 static struct inet6_protocol ip6gre_protocol __read_mostly = { 1080 .handler = gre_rcv, 1081 .err_handler = ip6gre_err, 1082 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 1083 }; 1084 1085 static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head) 1086 { 1087 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1088 struct net_device *dev, *aux; 1089 int prio; 1090 1091 for_each_netdev_safe(net, dev, aux) 1092 if (dev->rtnl_link_ops == &ip6gre_link_ops || 1093 dev->rtnl_link_ops == &ip6gre_tap_ops) 1094 unregister_netdevice_queue(dev, head); 1095 1096 for (prio = 0; prio < 4; prio++) { 1097 int h; 1098 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) { 1099 struct ip6_tnl *t; 1100 1101 t = rtnl_dereference(ign->tunnels[prio][h]); 1102 1103 while (t) { 1104 /* If dev is in the same netns, it has already 1105 * been added to the list by the previous loop. 1106 */ 1107 if (!net_eq(dev_net(t->dev), net)) 1108 unregister_netdevice_queue(t->dev, 1109 head); 1110 t = rtnl_dereference(t->next); 1111 } 1112 } 1113 } 1114 } 1115 1116 static int __net_init ip6gre_init_net(struct net *net) 1117 { 1118 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1119 int err; 1120 1121 ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0", 1122 NET_NAME_UNKNOWN, 1123 ip6gre_tunnel_setup); 1124 if (!ign->fb_tunnel_dev) { 1125 err = -ENOMEM; 1126 goto err_alloc_dev; 1127 } 1128 dev_net_set(ign->fb_tunnel_dev, net); 1129 /* FB netdevice is special: we have one, and only one per netns. 1130 * Allowing to move it to another netns is clearly unsafe. 1131 */ 1132 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL; 1133 1134 1135 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev); 1136 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops; 1137 1138 err = register_netdev(ign->fb_tunnel_dev); 1139 if (err) 1140 goto err_reg_dev; 1141 1142 rcu_assign_pointer(ign->tunnels_wc[0], 1143 netdev_priv(ign->fb_tunnel_dev)); 1144 return 0; 1145 1146 err_reg_dev: 1147 ip6gre_dev_free(ign->fb_tunnel_dev); 1148 err_alloc_dev: 1149 return err; 1150 } 1151 1152 static void __net_exit ip6gre_exit_net(struct net *net) 1153 { 1154 LIST_HEAD(list); 1155 1156 rtnl_lock(); 1157 ip6gre_destroy_tunnels(net, &list); 1158 unregister_netdevice_many(&list); 1159 rtnl_unlock(); 1160 } 1161 1162 static struct pernet_operations ip6gre_net_ops = { 1163 .init = ip6gre_init_net, 1164 .exit = ip6gre_exit_net, 1165 .id = &ip6gre_net_id, 1166 .size = sizeof(struct ip6gre_net), 1167 }; 1168 1169 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[]) 1170 { 1171 __be16 flags; 1172 1173 if (!data) 1174 return 0; 1175 1176 flags = 0; 1177 if (data[IFLA_GRE_IFLAGS]) 1178 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); 1179 if (data[IFLA_GRE_OFLAGS]) 1180 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); 1181 if (flags & (GRE_VERSION|GRE_ROUTING)) 1182 return -EINVAL; 1183 1184 return 0; 1185 } 1186 1187 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[]) 1188 { 1189 struct in6_addr daddr; 1190 1191 if (tb[IFLA_ADDRESS]) { 1192 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 1193 return -EINVAL; 1194 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 1195 return -EADDRNOTAVAIL; 1196 } 1197 1198 if (!data) 1199 goto out; 1200 1201 if (data[IFLA_GRE_REMOTE]) { 1202 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]); 1203 if (ipv6_addr_any(&daddr)) 1204 return -EINVAL; 1205 } 1206 1207 out: 1208 return ip6gre_tunnel_validate(tb, data); 1209 } 1210 1211 1212 static void ip6gre_netlink_parms(struct nlattr *data[], 1213 struct __ip6_tnl_parm *parms) 1214 { 1215 memset(parms, 0, sizeof(*parms)); 1216 1217 if (!data) 1218 return; 1219 1220 if (data[IFLA_GRE_LINK]) 1221 parms->link = nla_get_u32(data[IFLA_GRE_LINK]); 1222 1223 if (data[IFLA_GRE_IFLAGS]) 1224 parms->i_flags = gre_flags_to_tnl_flags( 1225 nla_get_be16(data[IFLA_GRE_IFLAGS])); 1226 1227 if (data[IFLA_GRE_OFLAGS]) 1228 parms->o_flags = gre_flags_to_tnl_flags( 1229 nla_get_be16(data[IFLA_GRE_OFLAGS])); 1230 1231 if (data[IFLA_GRE_IKEY]) 1232 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]); 1233 1234 if (data[IFLA_GRE_OKEY]) 1235 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]); 1236 1237 if (data[IFLA_GRE_LOCAL]) 1238 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]); 1239 1240 if (data[IFLA_GRE_REMOTE]) 1241 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]); 1242 1243 if (data[IFLA_GRE_TTL]) 1244 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]); 1245 1246 if (data[IFLA_GRE_ENCAP_LIMIT]) 1247 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]); 1248 1249 if (data[IFLA_GRE_FLOWINFO]) 1250 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]); 1251 1252 if (data[IFLA_GRE_FLAGS]) 1253 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]); 1254 } 1255 1256 static int ip6gre_tap_init(struct net_device *dev) 1257 { 1258 struct ip6_tnl *tunnel; 1259 int ret; 1260 1261 ret = ip6gre_tunnel_init_common(dev); 1262 if (ret) 1263 return ret; 1264 1265 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 1266 1267 tunnel = netdev_priv(dev); 1268 1269 ip6gre_tnl_link_config(tunnel, 1); 1270 1271 return 0; 1272 } 1273 1274 static const struct net_device_ops ip6gre_tap_netdev_ops = { 1275 .ndo_init = ip6gre_tap_init, 1276 .ndo_uninit = ip6gre_tunnel_uninit, 1277 .ndo_start_xmit = ip6gre_tunnel_xmit, 1278 .ndo_set_mac_address = eth_mac_addr, 1279 .ndo_validate_addr = eth_validate_addr, 1280 .ndo_change_mtu = ip6_tnl_change_mtu, 1281 .ndo_get_stats64 = ip_tunnel_get_stats64, 1282 .ndo_get_iflink = ip6_tnl_get_iflink, 1283 }; 1284 1285 #define GRE6_FEATURES (NETIF_F_SG | \ 1286 NETIF_F_FRAGLIST | \ 1287 NETIF_F_HIGHDMA | \ 1288 NETIF_F_HW_CSUM) 1289 1290 static void ip6gre_tap_setup(struct net_device *dev) 1291 { 1292 1293 ether_setup(dev); 1294 1295 dev->netdev_ops = &ip6gre_tap_netdev_ops; 1296 dev->destructor = ip6gre_dev_free; 1297 1298 dev->features |= NETIF_F_NETNS_LOCAL; 1299 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1300 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 1301 } 1302 1303 static bool ip6gre_netlink_encap_parms(struct nlattr *data[], 1304 struct ip_tunnel_encap *ipencap) 1305 { 1306 bool ret = false; 1307 1308 memset(ipencap, 0, sizeof(*ipencap)); 1309 1310 if (!data) 1311 return ret; 1312 1313 if (data[IFLA_GRE_ENCAP_TYPE]) { 1314 ret = true; 1315 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]); 1316 } 1317 1318 if (data[IFLA_GRE_ENCAP_FLAGS]) { 1319 ret = true; 1320 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]); 1321 } 1322 1323 if (data[IFLA_GRE_ENCAP_SPORT]) { 1324 ret = true; 1325 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]); 1326 } 1327 1328 if (data[IFLA_GRE_ENCAP_DPORT]) { 1329 ret = true; 1330 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]); 1331 } 1332 1333 return ret; 1334 } 1335 1336 static int ip6gre_newlink(struct net *src_net, struct net_device *dev, 1337 struct nlattr *tb[], struct nlattr *data[]) 1338 { 1339 struct ip6_tnl *nt; 1340 struct net *net = dev_net(dev); 1341 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1342 struct ip_tunnel_encap ipencap; 1343 int err; 1344 1345 nt = netdev_priv(dev); 1346 1347 if (ip6gre_netlink_encap_parms(data, &ipencap)) { 1348 int err = ip6_tnl_encap_setup(nt, &ipencap); 1349 1350 if (err < 0) 1351 return err; 1352 } 1353 1354 ip6gre_netlink_parms(data, &nt->parms); 1355 1356 if (ip6gre_tunnel_find(net, &nt->parms, dev->type)) 1357 return -EEXIST; 1358 1359 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS]) 1360 eth_hw_addr_random(dev); 1361 1362 nt->dev = dev; 1363 nt->net = dev_net(dev); 1364 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]); 1365 1366 dev->features |= GRE6_FEATURES; 1367 dev->hw_features |= GRE6_FEATURES; 1368 1369 if (!(nt->parms.o_flags & TUNNEL_SEQ)) { 1370 /* TCP offload with GRE SEQ is not supported, nor 1371 * can we support 2 levels of outer headers requiring 1372 * an update. 1373 */ 1374 if (!(nt->parms.o_flags & TUNNEL_CSUM) || 1375 (nt->encap.type == TUNNEL_ENCAP_NONE)) { 1376 dev->features |= NETIF_F_GSO_SOFTWARE; 1377 dev->hw_features |= NETIF_F_GSO_SOFTWARE; 1378 } 1379 1380 /* Can use a lockless transmit, unless we generate 1381 * output sequences 1382 */ 1383 dev->features |= NETIF_F_LLTX; 1384 } 1385 1386 err = register_netdevice(dev); 1387 if (err) 1388 goto out; 1389 1390 dev_hold(dev); 1391 ip6gre_tunnel_link(ign, nt); 1392 1393 out: 1394 return err; 1395 } 1396 1397 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[], 1398 struct nlattr *data[]) 1399 { 1400 struct ip6_tnl *t, *nt = netdev_priv(dev); 1401 struct net *net = nt->net; 1402 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1403 struct __ip6_tnl_parm p; 1404 struct ip_tunnel_encap ipencap; 1405 1406 if (dev == ign->fb_tunnel_dev) 1407 return -EINVAL; 1408 1409 if (ip6gre_netlink_encap_parms(data, &ipencap)) { 1410 int err = ip6_tnl_encap_setup(nt, &ipencap); 1411 1412 if (err < 0) 1413 return err; 1414 } 1415 1416 ip6gre_netlink_parms(data, &p); 1417 1418 t = ip6gre_tunnel_locate(net, &p, 0); 1419 1420 if (t) { 1421 if (t->dev != dev) 1422 return -EEXIST; 1423 } else { 1424 t = nt; 1425 } 1426 1427 ip6gre_tunnel_unlink(ign, t); 1428 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]); 1429 ip6gre_tunnel_link(ign, t); 1430 return 0; 1431 } 1432 1433 static void ip6gre_dellink(struct net_device *dev, struct list_head *head) 1434 { 1435 struct net *net = dev_net(dev); 1436 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1437 1438 if (dev != ign->fb_tunnel_dev) 1439 unregister_netdevice_queue(dev, head); 1440 } 1441 1442 static size_t ip6gre_get_size(const struct net_device *dev) 1443 { 1444 return 1445 /* IFLA_GRE_LINK */ 1446 nla_total_size(4) + 1447 /* IFLA_GRE_IFLAGS */ 1448 nla_total_size(2) + 1449 /* IFLA_GRE_OFLAGS */ 1450 nla_total_size(2) + 1451 /* IFLA_GRE_IKEY */ 1452 nla_total_size(4) + 1453 /* IFLA_GRE_OKEY */ 1454 nla_total_size(4) + 1455 /* IFLA_GRE_LOCAL */ 1456 nla_total_size(sizeof(struct in6_addr)) + 1457 /* IFLA_GRE_REMOTE */ 1458 nla_total_size(sizeof(struct in6_addr)) + 1459 /* IFLA_GRE_TTL */ 1460 nla_total_size(1) + 1461 /* IFLA_GRE_ENCAP_LIMIT */ 1462 nla_total_size(1) + 1463 /* IFLA_GRE_FLOWINFO */ 1464 nla_total_size(4) + 1465 /* IFLA_GRE_FLAGS */ 1466 nla_total_size(4) + 1467 /* IFLA_GRE_ENCAP_TYPE */ 1468 nla_total_size(2) + 1469 /* IFLA_GRE_ENCAP_FLAGS */ 1470 nla_total_size(2) + 1471 /* IFLA_GRE_ENCAP_SPORT */ 1472 nla_total_size(2) + 1473 /* IFLA_GRE_ENCAP_DPORT */ 1474 nla_total_size(2) + 1475 0; 1476 } 1477 1478 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev) 1479 { 1480 struct ip6_tnl *t = netdev_priv(dev); 1481 struct __ip6_tnl_parm *p = &t->parms; 1482 1483 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) || 1484 nla_put_be16(skb, IFLA_GRE_IFLAGS, 1485 gre_tnl_flags_to_gre_flags(p->i_flags)) || 1486 nla_put_be16(skb, IFLA_GRE_OFLAGS, 1487 gre_tnl_flags_to_gre_flags(p->o_flags)) || 1488 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) || 1489 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) || 1490 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) || 1491 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) || 1492 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) || 1493 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) || 1494 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) || 1495 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags)) 1496 goto nla_put_failure; 1497 1498 if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE, 1499 t->encap.type) || 1500 nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT, 1501 t->encap.sport) || 1502 nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT, 1503 t->encap.dport) || 1504 nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS, 1505 t->encap.flags)) 1506 goto nla_put_failure; 1507 1508 return 0; 1509 1510 nla_put_failure: 1511 return -EMSGSIZE; 1512 } 1513 1514 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = { 1515 [IFLA_GRE_LINK] = { .type = NLA_U32 }, 1516 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 }, 1517 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 }, 1518 [IFLA_GRE_IKEY] = { .type = NLA_U32 }, 1519 [IFLA_GRE_OKEY] = { .type = NLA_U32 }, 1520 [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) }, 1521 [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) }, 1522 [IFLA_GRE_TTL] = { .type = NLA_U8 }, 1523 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 }, 1524 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 }, 1525 [IFLA_GRE_FLAGS] = { .type = NLA_U32 }, 1526 [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 }, 1527 [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 }, 1528 [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 }, 1529 [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 }, 1530 }; 1531 1532 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = { 1533 .kind = "ip6gre", 1534 .maxtype = IFLA_GRE_MAX, 1535 .policy = ip6gre_policy, 1536 .priv_size = sizeof(struct ip6_tnl), 1537 .setup = ip6gre_tunnel_setup, 1538 .validate = ip6gre_tunnel_validate, 1539 .newlink = ip6gre_newlink, 1540 .changelink = ip6gre_changelink, 1541 .dellink = ip6gre_dellink, 1542 .get_size = ip6gre_get_size, 1543 .fill_info = ip6gre_fill_info, 1544 .get_link_net = ip6_tnl_get_link_net, 1545 }; 1546 1547 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = { 1548 .kind = "ip6gretap", 1549 .maxtype = IFLA_GRE_MAX, 1550 .policy = ip6gre_policy, 1551 .priv_size = sizeof(struct ip6_tnl), 1552 .setup = ip6gre_tap_setup, 1553 .validate = ip6gre_tap_validate, 1554 .newlink = ip6gre_newlink, 1555 .changelink = ip6gre_changelink, 1556 .get_size = ip6gre_get_size, 1557 .fill_info = ip6gre_fill_info, 1558 .get_link_net = ip6_tnl_get_link_net, 1559 }; 1560 1561 /* 1562 * And now the modules code and kernel interface. 1563 */ 1564 1565 static int __init ip6gre_init(void) 1566 { 1567 int err; 1568 1569 pr_info("GRE over IPv6 tunneling driver\n"); 1570 1571 err = register_pernet_device(&ip6gre_net_ops); 1572 if (err < 0) 1573 return err; 1574 1575 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE); 1576 if (err < 0) { 1577 pr_info("%s: can't add protocol\n", __func__); 1578 goto add_proto_failed; 1579 } 1580 1581 err = rtnl_link_register(&ip6gre_link_ops); 1582 if (err < 0) 1583 goto rtnl_link_failed; 1584 1585 err = rtnl_link_register(&ip6gre_tap_ops); 1586 if (err < 0) 1587 goto tap_ops_failed; 1588 1589 out: 1590 return err; 1591 1592 tap_ops_failed: 1593 rtnl_link_unregister(&ip6gre_link_ops); 1594 rtnl_link_failed: 1595 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE); 1596 add_proto_failed: 1597 unregister_pernet_device(&ip6gre_net_ops); 1598 goto out; 1599 } 1600 1601 static void __exit ip6gre_fini(void) 1602 { 1603 rtnl_link_unregister(&ip6gre_tap_ops); 1604 rtnl_link_unregister(&ip6gre_link_ops); 1605 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE); 1606 unregister_pernet_device(&ip6gre_net_ops); 1607 } 1608 1609 module_init(ip6gre_init); 1610 module_exit(ip6gre_fini); 1611 MODULE_LICENSE("GPL"); 1612 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)"); 1613 MODULE_DESCRIPTION("GRE over IPv6 tunneling device"); 1614 MODULE_ALIAS_RTNL_LINK("ip6gre"); 1615 MODULE_ALIAS_RTNL_LINK("ip6gretap"); 1616 MODULE_ALIAS_NETDEV("ip6gre0"); 1617