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 static int gre_handle_offloads(struct sk_buff *skb, bool csum) 490 { 491 return iptunnel_handle_offloads(skb, 492 csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE); 493 } 494 495 static netdev_tx_t __gre6_xmit(struct sk_buff *skb, 496 struct net_device *dev, __u8 dsfield, 497 struct flowi6 *fl6, int encap_limit, 498 __u32 *pmtu, __be16 proto) 499 { 500 struct ip6_tnl *tunnel = netdev_priv(dev); 501 __be16 protocol = (dev->type == ARPHRD_ETHER) ? 502 htons(ETH_P_TEB) : proto; 503 504 if (dev->type == ARPHRD_ETHER) 505 IPCB(skb)->flags = 0; 506 507 if (dev->header_ops && dev->type == ARPHRD_IP6GRE) 508 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr; 509 else 510 fl6->daddr = tunnel->parms.raddr; 511 512 if (tunnel->parms.o_flags & TUNNEL_SEQ) 513 tunnel->o_seqno++; 514 515 /* Push GRE header. */ 516 gre_build_header(skb, tunnel->tun_hlen, tunnel->parms.o_flags, 517 protocol, tunnel->parms.o_key, htonl(tunnel->o_seqno)); 518 519 return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu, 520 NEXTHDR_GRE); 521 } 522 523 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev) 524 { 525 struct ip6_tnl *t = netdev_priv(dev); 526 const struct iphdr *iph = ip_hdr(skb); 527 int encap_limit = -1; 528 struct flowi6 fl6; 529 __u8 dsfield; 530 __u32 mtu; 531 int err; 532 533 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); 534 535 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 536 encap_limit = t->parms.encap_limit; 537 538 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); 539 540 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) 541 dsfield = ipv4_get_dsfield(iph); 542 else 543 dsfield = ip6_tclass(t->parms.flowinfo); 544 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) 545 fl6.flowi6_mark = skb->mark; 546 else 547 fl6.flowi6_mark = t->parms.fwmark; 548 549 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL); 550 551 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)); 552 if (err) 553 return -1; 554 555 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, 556 skb->protocol); 557 if (err != 0) { 558 /* XXX: send ICMP error even if DF is not set. */ 559 if (err == -EMSGSIZE) 560 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, 561 htonl(mtu)); 562 return -1; 563 } 564 565 return 0; 566 } 567 568 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev) 569 { 570 struct ip6_tnl *t = netdev_priv(dev); 571 struct ipv6hdr *ipv6h = ipv6_hdr(skb); 572 int encap_limit = -1; 573 __u16 offset; 574 struct flowi6 fl6; 575 __u8 dsfield; 576 __u32 mtu; 577 int err; 578 579 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr)) 580 return -1; 581 582 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb)); 583 /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */ 584 ipv6h = ipv6_hdr(skb); 585 586 if (offset > 0) { 587 struct ipv6_tlv_tnl_enc_lim *tel; 588 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset]; 589 if (tel->encap_limit == 0) { 590 icmpv6_send(skb, ICMPV6_PARAMPROB, 591 ICMPV6_HDR_FIELD, offset + 2); 592 return -1; 593 } 594 encap_limit = tel->encap_limit - 1; 595 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 596 encap_limit = t->parms.encap_limit; 597 598 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); 599 600 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) 601 dsfield = ipv6_get_dsfield(ipv6h); 602 else 603 dsfield = ip6_tclass(t->parms.flowinfo); 604 605 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL) 606 fl6.flowlabel |= ip6_flowlabel(ipv6h); 607 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) 608 fl6.flowi6_mark = skb->mark; 609 else 610 fl6.flowi6_mark = t->parms.fwmark; 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 t->parms.fwmark = p->fwmark; 789 dst_cache_reset(&t->dst_cache); 790 ip6gre_tnl_link_config(t, set_mtu); 791 return 0; 792 } 793 794 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p, 795 const struct ip6_tnl_parm2 *u) 796 { 797 p->laddr = u->laddr; 798 p->raddr = u->raddr; 799 p->flags = u->flags; 800 p->hop_limit = u->hop_limit; 801 p->encap_limit = u->encap_limit; 802 p->flowinfo = u->flowinfo; 803 p->link = u->link; 804 p->i_key = u->i_key; 805 p->o_key = u->o_key; 806 p->i_flags = gre_flags_to_tnl_flags(u->i_flags); 807 p->o_flags = gre_flags_to_tnl_flags(u->o_flags); 808 memcpy(p->name, u->name, sizeof(u->name)); 809 } 810 811 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u, 812 const struct __ip6_tnl_parm *p) 813 { 814 u->proto = IPPROTO_GRE; 815 u->laddr = p->laddr; 816 u->raddr = p->raddr; 817 u->flags = p->flags; 818 u->hop_limit = p->hop_limit; 819 u->encap_limit = p->encap_limit; 820 u->flowinfo = p->flowinfo; 821 u->link = p->link; 822 u->i_key = p->i_key; 823 u->o_key = p->o_key; 824 u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags); 825 u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags); 826 memcpy(u->name, p->name, sizeof(u->name)); 827 } 828 829 static int ip6gre_tunnel_ioctl(struct net_device *dev, 830 struct ifreq *ifr, int cmd) 831 { 832 int err = 0; 833 struct ip6_tnl_parm2 p; 834 struct __ip6_tnl_parm p1; 835 struct ip6_tnl *t = netdev_priv(dev); 836 struct net *net = t->net; 837 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 838 839 memset(&p1, 0, sizeof(p1)); 840 841 switch (cmd) { 842 case SIOCGETTUNNEL: 843 if (dev == ign->fb_tunnel_dev) { 844 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { 845 err = -EFAULT; 846 break; 847 } 848 ip6gre_tnl_parm_from_user(&p1, &p); 849 t = ip6gre_tunnel_locate(net, &p1, 0); 850 if (!t) 851 t = netdev_priv(dev); 852 } 853 memset(&p, 0, sizeof(p)); 854 ip6gre_tnl_parm_to_user(&p, &t->parms); 855 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) 856 err = -EFAULT; 857 break; 858 859 case SIOCADDTUNNEL: 860 case SIOCCHGTUNNEL: 861 err = -EPERM; 862 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 863 goto done; 864 865 err = -EFAULT; 866 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 867 goto done; 868 869 err = -EINVAL; 870 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING)) 871 goto done; 872 873 if (!(p.i_flags&GRE_KEY)) 874 p.i_key = 0; 875 if (!(p.o_flags&GRE_KEY)) 876 p.o_key = 0; 877 878 ip6gre_tnl_parm_from_user(&p1, &p); 879 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL); 880 881 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { 882 if (t) { 883 if (t->dev != dev) { 884 err = -EEXIST; 885 break; 886 } 887 } else { 888 t = netdev_priv(dev); 889 890 ip6gre_tunnel_unlink(ign, t); 891 synchronize_net(); 892 ip6gre_tnl_change(t, &p1, 1); 893 ip6gre_tunnel_link(ign, t); 894 netdev_state_change(dev); 895 } 896 } 897 898 if (t) { 899 err = 0; 900 901 memset(&p, 0, sizeof(p)); 902 ip6gre_tnl_parm_to_user(&p, &t->parms); 903 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) 904 err = -EFAULT; 905 } else 906 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); 907 break; 908 909 case SIOCDELTUNNEL: 910 err = -EPERM; 911 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 912 goto done; 913 914 if (dev == ign->fb_tunnel_dev) { 915 err = -EFAULT; 916 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 917 goto done; 918 err = -ENOENT; 919 ip6gre_tnl_parm_from_user(&p1, &p); 920 t = ip6gre_tunnel_locate(net, &p1, 0); 921 if (!t) 922 goto done; 923 err = -EPERM; 924 if (t == netdev_priv(ign->fb_tunnel_dev)) 925 goto done; 926 dev = t->dev; 927 } 928 unregister_netdevice(dev); 929 err = 0; 930 break; 931 932 default: 933 err = -EINVAL; 934 } 935 936 done: 937 return err; 938 } 939 940 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev, 941 unsigned short type, 942 const void *daddr, const void *saddr, unsigned int len) 943 { 944 struct ip6_tnl *t = netdev_priv(dev); 945 struct ipv6hdr *ipv6h = skb_push(skb, t->hlen); 946 __be16 *p = (__be16 *)(ipv6h+1); 947 948 ip6_flow_hdr(ipv6h, 0, 949 ip6_make_flowlabel(dev_net(dev), skb, 950 t->fl.u.ip6.flowlabel, true, 951 &t->fl.u.ip6)); 952 ipv6h->hop_limit = t->parms.hop_limit; 953 ipv6h->nexthdr = NEXTHDR_GRE; 954 ipv6h->saddr = t->parms.laddr; 955 ipv6h->daddr = t->parms.raddr; 956 957 p[0] = t->parms.o_flags; 958 p[1] = htons(type); 959 960 /* 961 * Set the source hardware address. 962 */ 963 964 if (saddr) 965 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr)); 966 if (daddr) 967 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr)); 968 if (!ipv6_addr_any(&ipv6h->daddr)) 969 return t->hlen; 970 971 return -t->hlen; 972 } 973 974 static const struct header_ops ip6gre_header_ops = { 975 .create = ip6gre_header, 976 }; 977 978 static const struct net_device_ops ip6gre_netdev_ops = { 979 .ndo_init = ip6gre_tunnel_init, 980 .ndo_uninit = ip6gre_tunnel_uninit, 981 .ndo_start_xmit = ip6gre_tunnel_xmit, 982 .ndo_do_ioctl = ip6gre_tunnel_ioctl, 983 .ndo_change_mtu = ip6_tnl_change_mtu, 984 .ndo_get_stats64 = ip_tunnel_get_stats64, 985 .ndo_get_iflink = ip6_tnl_get_iflink, 986 }; 987 988 static void ip6gre_dev_free(struct net_device *dev) 989 { 990 struct ip6_tnl *t = netdev_priv(dev); 991 992 dst_cache_destroy(&t->dst_cache); 993 free_percpu(dev->tstats); 994 } 995 996 static void ip6gre_tunnel_setup(struct net_device *dev) 997 { 998 dev->netdev_ops = &ip6gre_netdev_ops; 999 dev->needs_free_netdev = true; 1000 dev->priv_destructor = ip6gre_dev_free; 1001 1002 dev->type = ARPHRD_IP6GRE; 1003 1004 dev->flags |= IFF_NOARP; 1005 dev->addr_len = sizeof(struct in6_addr); 1006 netif_keep_dst(dev); 1007 /* This perm addr will be used as interface identifier by IPv6 */ 1008 dev->addr_assign_type = NET_ADDR_RANDOM; 1009 eth_random_addr(dev->perm_addr); 1010 } 1011 1012 static int ip6gre_tunnel_init_common(struct net_device *dev) 1013 { 1014 struct ip6_tnl *tunnel; 1015 int ret; 1016 int t_hlen; 1017 1018 tunnel = netdev_priv(dev); 1019 1020 tunnel->dev = dev; 1021 tunnel->net = dev_net(dev); 1022 strcpy(tunnel->parms.name, dev->name); 1023 1024 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 1025 if (!dev->tstats) 1026 return -ENOMEM; 1027 1028 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); 1029 if (ret) { 1030 free_percpu(dev->tstats); 1031 dev->tstats = NULL; 1032 return ret; 1033 } 1034 1035 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags); 1036 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen; 1037 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr); 1038 1039 dev->hard_header_len = LL_MAX_HEADER + t_hlen; 1040 dev->mtu = ETH_DATA_LEN - t_hlen; 1041 if (dev->type == ARPHRD_ETHER) 1042 dev->mtu -= ETH_HLEN; 1043 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1044 dev->mtu -= 8; 1045 1046 return 0; 1047 } 1048 1049 static int ip6gre_tunnel_init(struct net_device *dev) 1050 { 1051 struct ip6_tnl *tunnel; 1052 int ret; 1053 1054 ret = ip6gre_tunnel_init_common(dev); 1055 if (ret) 1056 return ret; 1057 1058 tunnel = netdev_priv(dev); 1059 1060 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr)); 1061 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr)); 1062 1063 if (ipv6_addr_any(&tunnel->parms.raddr)) 1064 dev->header_ops = &ip6gre_header_ops; 1065 1066 return 0; 1067 } 1068 1069 static void ip6gre_fb_tunnel_init(struct net_device *dev) 1070 { 1071 struct ip6_tnl *tunnel = netdev_priv(dev); 1072 1073 tunnel->dev = dev; 1074 tunnel->net = dev_net(dev); 1075 strcpy(tunnel->parms.name, dev->name); 1076 1077 tunnel->hlen = sizeof(struct ipv6hdr) + 4; 1078 1079 dev_hold(dev); 1080 } 1081 1082 1083 static struct inet6_protocol ip6gre_protocol __read_mostly = { 1084 .handler = gre_rcv, 1085 .err_handler = ip6gre_err, 1086 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 1087 }; 1088 1089 static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head) 1090 { 1091 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1092 struct net_device *dev, *aux; 1093 int prio; 1094 1095 for_each_netdev_safe(net, dev, aux) 1096 if (dev->rtnl_link_ops == &ip6gre_link_ops || 1097 dev->rtnl_link_ops == &ip6gre_tap_ops) 1098 unregister_netdevice_queue(dev, head); 1099 1100 for (prio = 0; prio < 4; prio++) { 1101 int h; 1102 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) { 1103 struct ip6_tnl *t; 1104 1105 t = rtnl_dereference(ign->tunnels[prio][h]); 1106 1107 while (t) { 1108 /* If dev is in the same netns, it has already 1109 * been added to the list by the previous loop. 1110 */ 1111 if (!net_eq(dev_net(t->dev), net)) 1112 unregister_netdevice_queue(t->dev, 1113 head); 1114 t = rtnl_dereference(t->next); 1115 } 1116 } 1117 } 1118 } 1119 1120 static int __net_init ip6gre_init_net(struct net *net) 1121 { 1122 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1123 int err; 1124 1125 ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0", 1126 NET_NAME_UNKNOWN, 1127 ip6gre_tunnel_setup); 1128 if (!ign->fb_tunnel_dev) { 1129 err = -ENOMEM; 1130 goto err_alloc_dev; 1131 } 1132 dev_net_set(ign->fb_tunnel_dev, net); 1133 /* FB netdevice is special: we have one, and only one per netns. 1134 * Allowing to move it to another netns is clearly unsafe. 1135 */ 1136 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL; 1137 1138 1139 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev); 1140 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops; 1141 1142 err = register_netdev(ign->fb_tunnel_dev); 1143 if (err) 1144 goto err_reg_dev; 1145 1146 rcu_assign_pointer(ign->tunnels_wc[0], 1147 netdev_priv(ign->fb_tunnel_dev)); 1148 return 0; 1149 1150 err_reg_dev: 1151 free_netdev(ign->fb_tunnel_dev); 1152 err_alloc_dev: 1153 return err; 1154 } 1155 1156 static void __net_exit ip6gre_exit_net(struct net *net) 1157 { 1158 LIST_HEAD(list); 1159 1160 rtnl_lock(); 1161 ip6gre_destroy_tunnels(net, &list); 1162 unregister_netdevice_many(&list); 1163 rtnl_unlock(); 1164 } 1165 1166 static struct pernet_operations ip6gre_net_ops = { 1167 .init = ip6gre_init_net, 1168 .exit = ip6gre_exit_net, 1169 .id = &ip6gre_net_id, 1170 .size = sizeof(struct ip6gre_net), 1171 }; 1172 1173 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[], 1174 struct netlink_ext_ack *extack) 1175 { 1176 __be16 flags; 1177 1178 if (!data) 1179 return 0; 1180 1181 flags = 0; 1182 if (data[IFLA_GRE_IFLAGS]) 1183 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); 1184 if (data[IFLA_GRE_OFLAGS]) 1185 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); 1186 if (flags & (GRE_VERSION|GRE_ROUTING)) 1187 return -EINVAL; 1188 1189 return 0; 1190 } 1191 1192 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[], 1193 struct netlink_ext_ack *extack) 1194 { 1195 struct in6_addr daddr; 1196 1197 if (tb[IFLA_ADDRESS]) { 1198 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 1199 return -EINVAL; 1200 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 1201 return -EADDRNOTAVAIL; 1202 } 1203 1204 if (!data) 1205 goto out; 1206 1207 if (data[IFLA_GRE_REMOTE]) { 1208 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]); 1209 if (ipv6_addr_any(&daddr)) 1210 return -EINVAL; 1211 } 1212 1213 out: 1214 return ip6gre_tunnel_validate(tb, data, extack); 1215 } 1216 1217 1218 static void ip6gre_netlink_parms(struct nlattr *data[], 1219 struct __ip6_tnl_parm *parms) 1220 { 1221 memset(parms, 0, sizeof(*parms)); 1222 1223 if (!data) 1224 return; 1225 1226 if (data[IFLA_GRE_LINK]) 1227 parms->link = nla_get_u32(data[IFLA_GRE_LINK]); 1228 1229 if (data[IFLA_GRE_IFLAGS]) 1230 parms->i_flags = gre_flags_to_tnl_flags( 1231 nla_get_be16(data[IFLA_GRE_IFLAGS])); 1232 1233 if (data[IFLA_GRE_OFLAGS]) 1234 parms->o_flags = gre_flags_to_tnl_flags( 1235 nla_get_be16(data[IFLA_GRE_OFLAGS])); 1236 1237 if (data[IFLA_GRE_IKEY]) 1238 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]); 1239 1240 if (data[IFLA_GRE_OKEY]) 1241 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]); 1242 1243 if (data[IFLA_GRE_LOCAL]) 1244 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]); 1245 1246 if (data[IFLA_GRE_REMOTE]) 1247 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]); 1248 1249 if (data[IFLA_GRE_TTL]) 1250 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]); 1251 1252 if (data[IFLA_GRE_ENCAP_LIMIT]) 1253 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]); 1254 1255 if (data[IFLA_GRE_FLOWINFO]) 1256 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]); 1257 1258 if (data[IFLA_GRE_FLAGS]) 1259 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]); 1260 1261 if (data[IFLA_GRE_FWMARK]) 1262 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]); 1263 } 1264 1265 static int ip6gre_tap_init(struct net_device *dev) 1266 { 1267 struct ip6_tnl *tunnel; 1268 int ret; 1269 1270 ret = ip6gre_tunnel_init_common(dev); 1271 if (ret) 1272 return ret; 1273 1274 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 1275 1276 tunnel = netdev_priv(dev); 1277 1278 ip6gre_tnl_link_config(tunnel, 1); 1279 1280 return 0; 1281 } 1282 1283 static const struct net_device_ops ip6gre_tap_netdev_ops = { 1284 .ndo_init = ip6gre_tap_init, 1285 .ndo_uninit = ip6gre_tunnel_uninit, 1286 .ndo_start_xmit = ip6gre_tunnel_xmit, 1287 .ndo_set_mac_address = eth_mac_addr, 1288 .ndo_validate_addr = eth_validate_addr, 1289 .ndo_change_mtu = ip6_tnl_change_mtu, 1290 .ndo_get_stats64 = ip_tunnel_get_stats64, 1291 .ndo_get_iflink = ip6_tnl_get_iflink, 1292 }; 1293 1294 #define GRE6_FEATURES (NETIF_F_SG | \ 1295 NETIF_F_FRAGLIST | \ 1296 NETIF_F_HIGHDMA | \ 1297 NETIF_F_HW_CSUM) 1298 1299 static void ip6gre_tap_setup(struct net_device *dev) 1300 { 1301 1302 ether_setup(dev); 1303 1304 dev->netdev_ops = &ip6gre_tap_netdev_ops; 1305 dev->needs_free_netdev = true; 1306 dev->priv_destructor = ip6gre_dev_free; 1307 1308 dev->features |= NETIF_F_NETNS_LOCAL; 1309 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1310 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 1311 } 1312 1313 static bool ip6gre_netlink_encap_parms(struct nlattr *data[], 1314 struct ip_tunnel_encap *ipencap) 1315 { 1316 bool ret = false; 1317 1318 memset(ipencap, 0, sizeof(*ipencap)); 1319 1320 if (!data) 1321 return ret; 1322 1323 if (data[IFLA_GRE_ENCAP_TYPE]) { 1324 ret = true; 1325 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]); 1326 } 1327 1328 if (data[IFLA_GRE_ENCAP_FLAGS]) { 1329 ret = true; 1330 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]); 1331 } 1332 1333 if (data[IFLA_GRE_ENCAP_SPORT]) { 1334 ret = true; 1335 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]); 1336 } 1337 1338 if (data[IFLA_GRE_ENCAP_DPORT]) { 1339 ret = true; 1340 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]); 1341 } 1342 1343 return ret; 1344 } 1345 1346 static int ip6gre_newlink(struct net *src_net, struct net_device *dev, 1347 struct nlattr *tb[], struct nlattr *data[], 1348 struct netlink_ext_ack *extack) 1349 { 1350 struct ip6_tnl *nt; 1351 struct net *net = dev_net(dev); 1352 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1353 struct ip_tunnel_encap ipencap; 1354 int err; 1355 1356 nt = netdev_priv(dev); 1357 1358 if (ip6gre_netlink_encap_parms(data, &ipencap)) { 1359 int err = ip6_tnl_encap_setup(nt, &ipencap); 1360 1361 if (err < 0) 1362 return err; 1363 } 1364 1365 ip6gre_netlink_parms(data, &nt->parms); 1366 1367 if (ip6gre_tunnel_find(net, &nt->parms, dev->type)) 1368 return -EEXIST; 1369 1370 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS]) 1371 eth_hw_addr_random(dev); 1372 1373 nt->dev = dev; 1374 nt->net = dev_net(dev); 1375 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]); 1376 1377 dev->features |= GRE6_FEATURES; 1378 dev->hw_features |= GRE6_FEATURES; 1379 1380 if (!(nt->parms.o_flags & TUNNEL_SEQ)) { 1381 /* TCP offload with GRE SEQ is not supported, nor 1382 * can we support 2 levels of outer headers requiring 1383 * an update. 1384 */ 1385 if (!(nt->parms.o_flags & TUNNEL_CSUM) || 1386 (nt->encap.type == TUNNEL_ENCAP_NONE)) { 1387 dev->features |= NETIF_F_GSO_SOFTWARE; 1388 dev->hw_features |= NETIF_F_GSO_SOFTWARE; 1389 } 1390 1391 /* Can use a lockless transmit, unless we generate 1392 * output sequences 1393 */ 1394 dev->features |= NETIF_F_LLTX; 1395 } 1396 1397 err = register_netdevice(dev); 1398 if (err) 1399 goto out; 1400 1401 dev_hold(dev); 1402 ip6gre_tunnel_link(ign, nt); 1403 1404 out: 1405 return err; 1406 } 1407 1408 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[], 1409 struct nlattr *data[], 1410 struct netlink_ext_ack *extack) 1411 { 1412 struct ip6_tnl *t, *nt = netdev_priv(dev); 1413 struct net *net = nt->net; 1414 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1415 struct __ip6_tnl_parm p; 1416 struct ip_tunnel_encap ipencap; 1417 1418 if (dev == ign->fb_tunnel_dev) 1419 return -EINVAL; 1420 1421 if (ip6gre_netlink_encap_parms(data, &ipencap)) { 1422 int err = ip6_tnl_encap_setup(nt, &ipencap); 1423 1424 if (err < 0) 1425 return err; 1426 } 1427 1428 ip6gre_netlink_parms(data, &p); 1429 1430 t = ip6gre_tunnel_locate(net, &p, 0); 1431 1432 if (t) { 1433 if (t->dev != dev) 1434 return -EEXIST; 1435 } else { 1436 t = nt; 1437 } 1438 1439 ip6gre_tunnel_unlink(ign, t); 1440 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]); 1441 ip6gre_tunnel_link(ign, t); 1442 return 0; 1443 } 1444 1445 static void ip6gre_dellink(struct net_device *dev, struct list_head *head) 1446 { 1447 struct net *net = dev_net(dev); 1448 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1449 1450 if (dev != ign->fb_tunnel_dev) 1451 unregister_netdevice_queue(dev, head); 1452 } 1453 1454 static size_t ip6gre_get_size(const struct net_device *dev) 1455 { 1456 return 1457 /* IFLA_GRE_LINK */ 1458 nla_total_size(4) + 1459 /* IFLA_GRE_IFLAGS */ 1460 nla_total_size(2) + 1461 /* IFLA_GRE_OFLAGS */ 1462 nla_total_size(2) + 1463 /* IFLA_GRE_IKEY */ 1464 nla_total_size(4) + 1465 /* IFLA_GRE_OKEY */ 1466 nla_total_size(4) + 1467 /* IFLA_GRE_LOCAL */ 1468 nla_total_size(sizeof(struct in6_addr)) + 1469 /* IFLA_GRE_REMOTE */ 1470 nla_total_size(sizeof(struct in6_addr)) + 1471 /* IFLA_GRE_TTL */ 1472 nla_total_size(1) + 1473 /* IFLA_GRE_ENCAP_LIMIT */ 1474 nla_total_size(1) + 1475 /* IFLA_GRE_FLOWINFO */ 1476 nla_total_size(4) + 1477 /* IFLA_GRE_FLAGS */ 1478 nla_total_size(4) + 1479 /* IFLA_GRE_ENCAP_TYPE */ 1480 nla_total_size(2) + 1481 /* IFLA_GRE_ENCAP_FLAGS */ 1482 nla_total_size(2) + 1483 /* IFLA_GRE_ENCAP_SPORT */ 1484 nla_total_size(2) + 1485 /* IFLA_GRE_ENCAP_DPORT */ 1486 nla_total_size(2) + 1487 /* IFLA_GRE_FWMARK */ 1488 nla_total_size(4) + 1489 0; 1490 } 1491 1492 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev) 1493 { 1494 struct ip6_tnl *t = netdev_priv(dev); 1495 struct __ip6_tnl_parm *p = &t->parms; 1496 1497 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) || 1498 nla_put_be16(skb, IFLA_GRE_IFLAGS, 1499 gre_tnl_flags_to_gre_flags(p->i_flags)) || 1500 nla_put_be16(skb, IFLA_GRE_OFLAGS, 1501 gre_tnl_flags_to_gre_flags(p->o_flags)) || 1502 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) || 1503 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) || 1504 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) || 1505 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) || 1506 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) || 1507 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) || 1508 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) || 1509 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) || 1510 nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark)) 1511 goto nla_put_failure; 1512 1513 if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE, 1514 t->encap.type) || 1515 nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT, 1516 t->encap.sport) || 1517 nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT, 1518 t->encap.dport) || 1519 nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS, 1520 t->encap.flags)) 1521 goto nla_put_failure; 1522 1523 return 0; 1524 1525 nla_put_failure: 1526 return -EMSGSIZE; 1527 } 1528 1529 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = { 1530 [IFLA_GRE_LINK] = { .type = NLA_U32 }, 1531 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 }, 1532 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 }, 1533 [IFLA_GRE_IKEY] = { .type = NLA_U32 }, 1534 [IFLA_GRE_OKEY] = { .type = NLA_U32 }, 1535 [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) }, 1536 [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) }, 1537 [IFLA_GRE_TTL] = { .type = NLA_U8 }, 1538 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 }, 1539 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 }, 1540 [IFLA_GRE_FLAGS] = { .type = NLA_U32 }, 1541 [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 }, 1542 [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 }, 1543 [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 }, 1544 [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 }, 1545 [IFLA_GRE_FWMARK] = { .type = NLA_U32 }, 1546 }; 1547 1548 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = { 1549 .kind = "ip6gre", 1550 .maxtype = IFLA_GRE_MAX, 1551 .policy = ip6gre_policy, 1552 .priv_size = sizeof(struct ip6_tnl), 1553 .setup = ip6gre_tunnel_setup, 1554 .validate = ip6gre_tunnel_validate, 1555 .newlink = ip6gre_newlink, 1556 .changelink = ip6gre_changelink, 1557 .dellink = ip6gre_dellink, 1558 .get_size = ip6gre_get_size, 1559 .fill_info = ip6gre_fill_info, 1560 .get_link_net = ip6_tnl_get_link_net, 1561 }; 1562 1563 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = { 1564 .kind = "ip6gretap", 1565 .maxtype = IFLA_GRE_MAX, 1566 .policy = ip6gre_policy, 1567 .priv_size = sizeof(struct ip6_tnl), 1568 .setup = ip6gre_tap_setup, 1569 .validate = ip6gre_tap_validate, 1570 .newlink = ip6gre_newlink, 1571 .changelink = ip6gre_changelink, 1572 .get_size = ip6gre_get_size, 1573 .fill_info = ip6gre_fill_info, 1574 .get_link_net = ip6_tnl_get_link_net, 1575 }; 1576 1577 /* 1578 * And now the modules code and kernel interface. 1579 */ 1580 1581 static int __init ip6gre_init(void) 1582 { 1583 int err; 1584 1585 pr_info("GRE over IPv6 tunneling driver\n"); 1586 1587 err = register_pernet_device(&ip6gre_net_ops); 1588 if (err < 0) 1589 return err; 1590 1591 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE); 1592 if (err < 0) { 1593 pr_info("%s: can't add protocol\n", __func__); 1594 goto add_proto_failed; 1595 } 1596 1597 err = rtnl_link_register(&ip6gre_link_ops); 1598 if (err < 0) 1599 goto rtnl_link_failed; 1600 1601 err = rtnl_link_register(&ip6gre_tap_ops); 1602 if (err < 0) 1603 goto tap_ops_failed; 1604 1605 out: 1606 return err; 1607 1608 tap_ops_failed: 1609 rtnl_link_unregister(&ip6gre_link_ops); 1610 rtnl_link_failed: 1611 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE); 1612 add_proto_failed: 1613 unregister_pernet_device(&ip6gre_net_ops); 1614 goto out; 1615 } 1616 1617 static void __exit ip6gre_fini(void) 1618 { 1619 rtnl_link_unregister(&ip6gre_tap_ops); 1620 rtnl_link_unregister(&ip6gre_link_ops); 1621 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE); 1622 unregister_pernet_device(&ip6gre_net_ops); 1623 } 1624 1625 module_init(ip6gre_init); 1626 module_exit(ip6gre_fini); 1627 MODULE_LICENSE("GPL"); 1628 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)"); 1629 MODULE_DESCRIPTION("GRE over IPv6 tunneling device"); 1630 MODULE_ALIAS_RTNL_LINK("ip6gre"); 1631 MODULE_ALIAS_RTNL_LINK("ip6gretap"); 1632 MODULE_ALIAS_NETDEV("ip6gre0"); 1633