1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * IPv6 over IPv4 tunnel device - Simple Internet Transition (SIT) 4 * Linux INET6 implementation 5 * 6 * Authors: 7 * Pedro Roque <roque@di.fc.ul.pt> 8 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> 9 * 10 * Changes: 11 * Roger Venning <r.venning@telstra.com>: 6to4 support 12 * Nate Thompson <nate@thebog.net>: 6to4 support 13 * Fred Templin <fred.l.templin@boeing.com>: isatap support 14 */ 15 16 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 17 18 #include <linux/module.h> 19 #include <linux/capability.h> 20 #include <linux/errno.h> 21 #include <linux/types.h> 22 #include <linux/socket.h> 23 #include <linux/sockios.h> 24 #include <linux/net.h> 25 #include <linux/in6.h> 26 #include <linux/netdevice.h> 27 #include <linux/if_arp.h> 28 #include <linux/icmp.h> 29 #include <linux/slab.h> 30 #include <linux/uaccess.h> 31 #include <linux/init.h> 32 #include <linux/netfilter_ipv4.h> 33 #include <linux/if_ether.h> 34 35 #include <net/sock.h> 36 #include <net/snmp.h> 37 38 #include <net/ipv6.h> 39 #include <net/protocol.h> 40 #include <net/transp_v6.h> 41 #include <net/ip6_fib.h> 42 #include <net/ip6_route.h> 43 #include <net/ndisc.h> 44 #include <net/addrconf.h> 45 #include <net/ip.h> 46 #include <net/udp.h> 47 #include <net/icmp.h> 48 #include <net/ip_tunnels.h> 49 #include <net/inet_ecn.h> 50 #include <net/xfrm.h> 51 #include <net/dsfield.h> 52 #include <net/net_namespace.h> 53 #include <net/netns/generic.h> 54 55 /* 56 This version of net/ipv6/sit.c is cloned of net/ipv4/ip_gre.c 57 58 For comments look at net/ipv4/ip_gre.c --ANK 59 */ 60 61 #define IP6_SIT_HASH_SIZE 16 62 #define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF) 63 64 static bool log_ecn_error = true; 65 module_param(log_ecn_error, bool, 0644); 66 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); 67 68 static int ipip6_tunnel_init(struct net_device *dev); 69 static void ipip6_tunnel_setup(struct net_device *dev); 70 static void ipip6_dev_free(struct net_device *dev); 71 static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst, 72 __be32 *v4dst); 73 static struct rtnl_link_ops sit_link_ops __read_mostly; 74 75 static unsigned int sit_net_id __read_mostly; 76 struct sit_net { 77 struct ip_tunnel __rcu *tunnels_r_l[IP6_SIT_HASH_SIZE]; 78 struct ip_tunnel __rcu *tunnels_r[IP6_SIT_HASH_SIZE]; 79 struct ip_tunnel __rcu *tunnels_l[IP6_SIT_HASH_SIZE]; 80 struct ip_tunnel __rcu *tunnels_wc[1]; 81 struct ip_tunnel __rcu **tunnels[4]; 82 83 struct net_device *fb_tunnel_dev; 84 }; 85 86 static inline struct sit_net *dev_to_sit_net(struct net_device *dev) 87 { 88 struct ip_tunnel *t = netdev_priv(dev); 89 90 return net_generic(t->net, sit_net_id); 91 } 92 93 /* 94 * Must be invoked with rcu_read_lock 95 */ 96 static struct ip_tunnel *ipip6_tunnel_lookup(struct net *net, 97 struct net_device *dev, 98 __be32 remote, __be32 local, 99 int sifindex) 100 { 101 unsigned int h0 = HASH(remote); 102 unsigned int h1 = HASH(local); 103 struct ip_tunnel *t; 104 struct sit_net *sitn = net_generic(net, sit_net_id); 105 int ifindex = dev ? dev->ifindex : 0; 106 107 for_each_ip_tunnel_rcu(t, sitn->tunnels_r_l[h0 ^ h1]) { 108 if (local == t->parms.iph.saddr && 109 remote == t->parms.iph.daddr && 110 (!dev || !t->parms.link || ifindex == t->parms.link || 111 sifindex == t->parms.link) && 112 (t->dev->flags & IFF_UP)) 113 return t; 114 } 115 for_each_ip_tunnel_rcu(t, sitn->tunnels_r[h0]) { 116 if (remote == t->parms.iph.daddr && 117 (!dev || !t->parms.link || ifindex == t->parms.link || 118 sifindex == t->parms.link) && 119 (t->dev->flags & IFF_UP)) 120 return t; 121 } 122 for_each_ip_tunnel_rcu(t, sitn->tunnels_l[h1]) { 123 if (local == t->parms.iph.saddr && 124 (!dev || !t->parms.link || ifindex == t->parms.link || 125 sifindex == t->parms.link) && 126 (t->dev->flags & IFF_UP)) 127 return t; 128 } 129 t = rcu_dereference(sitn->tunnels_wc[0]); 130 if (t && (t->dev->flags & IFF_UP)) 131 return t; 132 return NULL; 133 } 134 135 static struct ip_tunnel __rcu **__ipip6_bucket(struct sit_net *sitn, 136 struct ip_tunnel_parm *parms) 137 { 138 __be32 remote = parms->iph.daddr; 139 __be32 local = parms->iph.saddr; 140 unsigned int h = 0; 141 int prio = 0; 142 143 if (remote) { 144 prio |= 2; 145 h ^= HASH(remote); 146 } 147 if (local) { 148 prio |= 1; 149 h ^= HASH(local); 150 } 151 return &sitn->tunnels[prio][h]; 152 } 153 154 static inline struct ip_tunnel __rcu **ipip6_bucket(struct sit_net *sitn, 155 struct ip_tunnel *t) 156 { 157 return __ipip6_bucket(sitn, &t->parms); 158 } 159 160 static void ipip6_tunnel_unlink(struct sit_net *sitn, struct ip_tunnel *t) 161 { 162 struct ip_tunnel __rcu **tp; 163 struct ip_tunnel *iter; 164 165 for (tp = ipip6_bucket(sitn, t); 166 (iter = rtnl_dereference(*tp)) != NULL; 167 tp = &iter->next) { 168 if (t == iter) { 169 rcu_assign_pointer(*tp, t->next); 170 break; 171 } 172 } 173 } 174 175 static void ipip6_tunnel_link(struct sit_net *sitn, struct ip_tunnel *t) 176 { 177 struct ip_tunnel __rcu **tp = ipip6_bucket(sitn, t); 178 179 rcu_assign_pointer(t->next, rtnl_dereference(*tp)); 180 rcu_assign_pointer(*tp, t); 181 } 182 183 static void ipip6_tunnel_clone_6rd(struct net_device *dev, struct sit_net *sitn) 184 { 185 #ifdef CONFIG_IPV6_SIT_6RD 186 struct ip_tunnel *t = netdev_priv(dev); 187 188 if (dev == sitn->fb_tunnel_dev || !sitn->fb_tunnel_dev) { 189 ipv6_addr_set(&t->ip6rd.prefix, htonl(0x20020000), 0, 0, 0); 190 t->ip6rd.relay_prefix = 0; 191 t->ip6rd.prefixlen = 16; 192 t->ip6rd.relay_prefixlen = 0; 193 } else { 194 struct ip_tunnel *t0 = netdev_priv(sitn->fb_tunnel_dev); 195 memcpy(&t->ip6rd, &t0->ip6rd, sizeof(t->ip6rd)); 196 } 197 #endif 198 } 199 200 static int ipip6_tunnel_create(struct net_device *dev) 201 { 202 struct ip_tunnel *t = netdev_priv(dev); 203 struct net *net = dev_net(dev); 204 struct sit_net *sitn = net_generic(net, sit_net_id); 205 int err; 206 207 memcpy(dev->dev_addr, &t->parms.iph.saddr, 4); 208 memcpy(dev->broadcast, &t->parms.iph.daddr, 4); 209 210 if ((__force u16)t->parms.i_flags & SIT_ISATAP) 211 dev->priv_flags |= IFF_ISATAP; 212 213 dev->rtnl_link_ops = &sit_link_ops; 214 215 err = register_netdevice(dev); 216 if (err < 0) 217 goto out; 218 219 ipip6_tunnel_clone_6rd(dev, sitn); 220 221 dev_hold(dev); 222 223 ipip6_tunnel_link(sitn, t); 224 return 0; 225 226 out: 227 return err; 228 } 229 230 static struct ip_tunnel *ipip6_tunnel_locate(struct net *net, 231 struct ip_tunnel_parm *parms, int create) 232 { 233 __be32 remote = parms->iph.daddr; 234 __be32 local = parms->iph.saddr; 235 struct ip_tunnel *t, *nt; 236 struct ip_tunnel __rcu **tp; 237 struct net_device *dev; 238 char name[IFNAMSIZ]; 239 struct sit_net *sitn = net_generic(net, sit_net_id); 240 241 for (tp = __ipip6_bucket(sitn, parms); 242 (t = rtnl_dereference(*tp)) != NULL; 243 tp = &t->next) { 244 if (local == t->parms.iph.saddr && 245 remote == t->parms.iph.daddr && 246 parms->link == t->parms.link) { 247 if (create) 248 return NULL; 249 else 250 return t; 251 } 252 } 253 if (!create) 254 goto failed; 255 256 if (parms->name[0]) { 257 if (!dev_valid_name(parms->name)) 258 goto failed; 259 strlcpy(name, parms->name, IFNAMSIZ); 260 } else { 261 strcpy(name, "sit%d"); 262 } 263 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, 264 ipip6_tunnel_setup); 265 if (!dev) 266 return NULL; 267 268 dev_net_set(dev, net); 269 270 nt = netdev_priv(dev); 271 272 nt->parms = *parms; 273 if (ipip6_tunnel_create(dev) < 0) 274 goto failed_free; 275 276 return nt; 277 278 failed_free: 279 free_netdev(dev); 280 failed: 281 return NULL; 282 } 283 284 #define for_each_prl_rcu(start) \ 285 for (prl = rcu_dereference(start); \ 286 prl; \ 287 prl = rcu_dereference(prl->next)) 288 289 static struct ip_tunnel_prl_entry * 290 __ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr) 291 { 292 struct ip_tunnel_prl_entry *prl; 293 294 for_each_prl_rcu(t->prl) 295 if (prl->addr == addr) 296 break; 297 return prl; 298 299 } 300 301 static int ipip6_tunnel_get_prl(struct net_device *dev, struct ifreq *ifr) 302 { 303 struct ip_tunnel_prl __user *a = ifr->ifr_ifru.ifru_data; 304 struct ip_tunnel *t = netdev_priv(dev); 305 struct ip_tunnel_prl kprl, *kp; 306 struct ip_tunnel_prl_entry *prl; 307 unsigned int cmax, c = 0, ca, len; 308 int ret = 0; 309 310 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) 311 return -EINVAL; 312 313 if (copy_from_user(&kprl, a, sizeof(kprl))) 314 return -EFAULT; 315 cmax = kprl.datalen / sizeof(kprl); 316 if (cmax > 1 && kprl.addr != htonl(INADDR_ANY)) 317 cmax = 1; 318 319 /* For simple GET or for root users, 320 * we try harder to allocate. 321 */ 322 kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ? 323 kcalloc(cmax, sizeof(*kp), GFP_KERNEL | __GFP_NOWARN) : 324 NULL; 325 326 rcu_read_lock(); 327 328 ca = t->prl_count < cmax ? t->prl_count : cmax; 329 330 if (!kp) { 331 /* We don't try hard to allocate much memory for 332 * non-root users. 333 * For root users, retry allocating enough memory for 334 * the answer. 335 */ 336 kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC); 337 if (!kp) { 338 ret = -ENOMEM; 339 goto out; 340 } 341 } 342 343 c = 0; 344 for_each_prl_rcu(t->prl) { 345 if (c >= cmax) 346 break; 347 if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr) 348 continue; 349 kp[c].addr = prl->addr; 350 kp[c].flags = prl->flags; 351 c++; 352 if (kprl.addr != htonl(INADDR_ANY)) 353 break; 354 } 355 out: 356 rcu_read_unlock(); 357 358 len = sizeof(*kp) * c; 359 ret = 0; 360 if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen)) 361 ret = -EFAULT; 362 363 kfree(kp); 364 365 return ret; 366 } 367 368 static int 369 ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg) 370 { 371 struct ip_tunnel_prl_entry *p; 372 int err = 0; 373 374 if (a->addr == htonl(INADDR_ANY)) 375 return -EINVAL; 376 377 ASSERT_RTNL(); 378 379 for (p = rtnl_dereference(t->prl); p; p = rtnl_dereference(p->next)) { 380 if (p->addr == a->addr) { 381 if (chg) { 382 p->flags = a->flags; 383 goto out; 384 } 385 err = -EEXIST; 386 goto out; 387 } 388 } 389 390 if (chg) { 391 err = -ENXIO; 392 goto out; 393 } 394 395 p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL); 396 if (!p) { 397 err = -ENOBUFS; 398 goto out; 399 } 400 401 p->next = t->prl; 402 p->addr = a->addr; 403 p->flags = a->flags; 404 t->prl_count++; 405 rcu_assign_pointer(t->prl, p); 406 out: 407 return err; 408 } 409 410 static void prl_list_destroy_rcu(struct rcu_head *head) 411 { 412 struct ip_tunnel_prl_entry *p, *n; 413 414 p = container_of(head, struct ip_tunnel_prl_entry, rcu_head); 415 do { 416 n = rcu_dereference_protected(p->next, 1); 417 kfree(p); 418 p = n; 419 } while (p); 420 } 421 422 static int 423 ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a) 424 { 425 struct ip_tunnel_prl_entry *x; 426 struct ip_tunnel_prl_entry __rcu **p; 427 int err = 0; 428 429 ASSERT_RTNL(); 430 431 if (a && a->addr != htonl(INADDR_ANY)) { 432 for (p = &t->prl; 433 (x = rtnl_dereference(*p)) != NULL; 434 p = &x->next) { 435 if (x->addr == a->addr) { 436 *p = x->next; 437 kfree_rcu(x, rcu_head); 438 t->prl_count--; 439 goto out; 440 } 441 } 442 err = -ENXIO; 443 } else { 444 x = rtnl_dereference(t->prl); 445 if (x) { 446 t->prl_count = 0; 447 call_rcu(&x->rcu_head, prl_list_destroy_rcu); 448 t->prl = NULL; 449 } 450 } 451 out: 452 return err; 453 } 454 455 static int ipip6_tunnel_prl_ctl(struct net_device *dev, struct ifreq *ifr, 456 int cmd) 457 { 458 struct ip_tunnel *t = netdev_priv(dev); 459 struct ip_tunnel_prl prl; 460 int err; 461 462 if (!ns_capable(t->net->user_ns, CAP_NET_ADMIN)) 463 return -EPERM; 464 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) 465 return -EINVAL; 466 467 if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl))) 468 return -EFAULT; 469 470 switch (cmd) { 471 case SIOCDELPRL: 472 err = ipip6_tunnel_del_prl(t, &prl); 473 break; 474 case SIOCADDPRL: 475 case SIOCCHGPRL: 476 err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL); 477 break; 478 } 479 dst_cache_reset(&t->dst_cache); 480 netdev_state_change(dev); 481 return err; 482 } 483 484 static int 485 isatap_chksrc(struct sk_buff *skb, const struct iphdr *iph, struct ip_tunnel *t) 486 { 487 struct ip_tunnel_prl_entry *p; 488 int ok = 1; 489 490 rcu_read_lock(); 491 p = __ipip6_tunnel_locate_prl(t, iph->saddr); 492 if (p) { 493 if (p->flags & PRL_DEFAULT) 494 skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT; 495 else 496 skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT; 497 } else { 498 const struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr; 499 500 if (ipv6_addr_is_isatap(addr6) && 501 (addr6->s6_addr32[3] == iph->saddr) && 502 ipv6_chk_prefix(addr6, t->dev)) 503 skb->ndisc_nodetype = NDISC_NODETYPE_HOST; 504 else 505 ok = 0; 506 } 507 rcu_read_unlock(); 508 return ok; 509 } 510 511 static void ipip6_tunnel_uninit(struct net_device *dev) 512 { 513 struct ip_tunnel *tunnel = netdev_priv(dev); 514 struct sit_net *sitn = net_generic(tunnel->net, sit_net_id); 515 516 if (dev == sitn->fb_tunnel_dev) { 517 RCU_INIT_POINTER(sitn->tunnels_wc[0], NULL); 518 } else { 519 ipip6_tunnel_unlink(sitn, tunnel); 520 ipip6_tunnel_del_prl(tunnel, NULL); 521 } 522 dst_cache_reset(&tunnel->dst_cache); 523 dev_put(dev); 524 } 525 526 static int ipip6_err(struct sk_buff *skb, u32 info) 527 { 528 const struct iphdr *iph = (const struct iphdr *)skb->data; 529 const int type = icmp_hdr(skb)->type; 530 const int code = icmp_hdr(skb)->code; 531 unsigned int data_len = 0; 532 struct ip_tunnel *t; 533 int sifindex; 534 int err; 535 536 switch (type) { 537 default: 538 case ICMP_PARAMETERPROB: 539 return 0; 540 541 case ICMP_DEST_UNREACH: 542 switch (code) { 543 case ICMP_SR_FAILED: 544 /* Impossible event. */ 545 return 0; 546 default: 547 /* All others are translated to HOST_UNREACH. 548 rfc2003 contains "deep thoughts" about NET_UNREACH, 549 I believe they are just ether pollution. --ANK 550 */ 551 break; 552 } 553 break; 554 case ICMP_TIME_EXCEEDED: 555 if (code != ICMP_EXC_TTL) 556 return 0; 557 data_len = icmp_hdr(skb)->un.reserved[1] * 4; /* RFC 4884 4.1 */ 558 break; 559 case ICMP_REDIRECT: 560 break; 561 } 562 563 err = -ENOENT; 564 565 sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0; 566 t = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, 567 iph->daddr, iph->saddr, sifindex); 568 if (!t) 569 goto out; 570 571 if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) { 572 ipv4_update_pmtu(skb, dev_net(skb->dev), info, 573 t->parms.link, iph->protocol); 574 err = 0; 575 goto out; 576 } 577 if (type == ICMP_REDIRECT) { 578 ipv4_redirect(skb, dev_net(skb->dev), t->parms.link, 579 iph->protocol); 580 err = 0; 581 goto out; 582 } 583 584 err = 0; 585 if (__in6_dev_get(skb->dev) && 586 !ip6_err_gen_icmpv6_unreach(skb, iph->ihl * 4, type, data_len)) 587 goto out; 588 589 if (t->parms.iph.daddr == 0) 590 goto out; 591 592 if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) 593 goto out; 594 595 if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) 596 t->err_count++; 597 else 598 t->err_count = 1; 599 t->err_time = jiffies; 600 out: 601 return err; 602 } 603 604 static inline bool is_spoofed_6rd(struct ip_tunnel *tunnel, const __be32 v4addr, 605 const struct in6_addr *v6addr) 606 { 607 __be32 v4embed = 0; 608 if (check_6rd(tunnel, v6addr, &v4embed) && v4addr != v4embed) 609 return true; 610 return false; 611 } 612 613 /* Checks if an address matches an address on the tunnel interface. 614 * Used to detect the NAT of proto 41 packets and let them pass spoofing test. 615 * Long story: 616 * This function is called after we considered the packet as spoofed 617 * in is_spoofed_6rd. 618 * We may have a router that is doing NAT for proto 41 packets 619 * for an internal station. Destination a.a.a.a/PREFIX:bbbb:bbbb 620 * will be translated to n.n.n.n/PREFIX:bbbb:bbbb. And is_spoofed_6rd 621 * function will return true, dropping the packet. 622 * But, we can still check if is spoofed against the IP 623 * addresses associated with the interface. 624 */ 625 static bool only_dnatted(const struct ip_tunnel *tunnel, 626 const struct in6_addr *v6dst) 627 { 628 int prefix_len; 629 630 #ifdef CONFIG_IPV6_SIT_6RD 631 prefix_len = tunnel->ip6rd.prefixlen + 32 632 - tunnel->ip6rd.relay_prefixlen; 633 #else 634 prefix_len = 48; 635 #endif 636 return ipv6_chk_custom_prefix(v6dst, prefix_len, tunnel->dev); 637 } 638 639 /* Returns true if a packet is spoofed */ 640 static bool packet_is_spoofed(struct sk_buff *skb, 641 const struct iphdr *iph, 642 struct ip_tunnel *tunnel) 643 { 644 const struct ipv6hdr *ipv6h; 645 646 if (tunnel->dev->priv_flags & IFF_ISATAP) { 647 if (!isatap_chksrc(skb, iph, tunnel)) 648 return true; 649 650 return false; 651 } 652 653 if (tunnel->dev->flags & IFF_POINTOPOINT) 654 return false; 655 656 ipv6h = ipv6_hdr(skb); 657 658 if (unlikely(is_spoofed_6rd(tunnel, iph->saddr, &ipv6h->saddr))) { 659 net_warn_ratelimited("Src spoofed %pI4/%pI6c -> %pI4/%pI6c\n", 660 &iph->saddr, &ipv6h->saddr, 661 &iph->daddr, &ipv6h->daddr); 662 return true; 663 } 664 665 if (likely(!is_spoofed_6rd(tunnel, iph->daddr, &ipv6h->daddr))) 666 return false; 667 668 if (only_dnatted(tunnel, &ipv6h->daddr)) 669 return false; 670 671 net_warn_ratelimited("Dst spoofed %pI4/%pI6c -> %pI4/%pI6c\n", 672 &iph->saddr, &ipv6h->saddr, 673 &iph->daddr, &ipv6h->daddr); 674 return true; 675 } 676 677 static int ipip6_rcv(struct sk_buff *skb) 678 { 679 const struct iphdr *iph = ip_hdr(skb); 680 struct ip_tunnel *tunnel; 681 int sifindex; 682 int err; 683 684 sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0; 685 tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, 686 iph->saddr, iph->daddr, sifindex); 687 if (tunnel) { 688 struct pcpu_sw_netstats *tstats; 689 690 if (tunnel->parms.iph.protocol != IPPROTO_IPV6 && 691 tunnel->parms.iph.protocol != 0) 692 goto out; 693 694 skb->mac_header = skb->network_header; 695 skb_reset_network_header(skb); 696 IPCB(skb)->flags = 0; 697 skb->dev = tunnel->dev; 698 699 if (packet_is_spoofed(skb, iph, tunnel)) { 700 tunnel->dev->stats.rx_errors++; 701 goto out; 702 } 703 704 if (iptunnel_pull_header(skb, 0, htons(ETH_P_IPV6), 705 !net_eq(tunnel->net, dev_net(tunnel->dev)))) 706 goto out; 707 708 /* skb can be uncloned in iptunnel_pull_header, so 709 * old iph is no longer valid 710 */ 711 iph = (const struct iphdr *)skb_mac_header(skb); 712 err = IP_ECN_decapsulate(iph, skb); 713 if (unlikely(err)) { 714 if (log_ecn_error) 715 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n", 716 &iph->saddr, iph->tos); 717 if (err > 1) { 718 ++tunnel->dev->stats.rx_frame_errors; 719 ++tunnel->dev->stats.rx_errors; 720 goto out; 721 } 722 } 723 724 tstats = this_cpu_ptr(tunnel->dev->tstats); 725 u64_stats_update_begin(&tstats->syncp); 726 tstats->rx_packets++; 727 tstats->rx_bytes += skb->len; 728 u64_stats_update_end(&tstats->syncp); 729 730 netif_rx(skb); 731 732 return 0; 733 } 734 735 /* no tunnel matched, let upstream know, ipsec may handle it */ 736 return 1; 737 out: 738 kfree_skb(skb); 739 return 0; 740 } 741 742 static const struct tnl_ptk_info ipip_tpi = { 743 /* no tunnel info required for ipip. */ 744 .proto = htons(ETH_P_IP), 745 }; 746 747 #if IS_ENABLED(CONFIG_MPLS) 748 static const struct tnl_ptk_info mplsip_tpi = { 749 /* no tunnel info required for mplsip. */ 750 .proto = htons(ETH_P_MPLS_UC), 751 }; 752 #endif 753 754 static int sit_tunnel_rcv(struct sk_buff *skb, u8 ipproto) 755 { 756 const struct iphdr *iph; 757 struct ip_tunnel *tunnel; 758 int sifindex; 759 760 sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0; 761 762 iph = ip_hdr(skb); 763 tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, 764 iph->saddr, iph->daddr, sifindex); 765 if (tunnel) { 766 const struct tnl_ptk_info *tpi; 767 768 if (tunnel->parms.iph.protocol != ipproto && 769 tunnel->parms.iph.protocol != 0) 770 goto drop; 771 772 if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) 773 goto drop; 774 #if IS_ENABLED(CONFIG_MPLS) 775 if (ipproto == IPPROTO_MPLS) 776 tpi = &mplsip_tpi; 777 else 778 #endif 779 tpi = &ipip_tpi; 780 if (iptunnel_pull_header(skb, 0, tpi->proto, false)) 781 goto drop; 782 return ip_tunnel_rcv(tunnel, skb, tpi, NULL, log_ecn_error); 783 } 784 785 return 1; 786 787 drop: 788 kfree_skb(skb); 789 return 0; 790 } 791 792 static int ipip_rcv(struct sk_buff *skb) 793 { 794 return sit_tunnel_rcv(skb, IPPROTO_IPIP); 795 } 796 797 #if IS_ENABLED(CONFIG_MPLS) 798 static int mplsip_rcv(struct sk_buff *skb) 799 { 800 return sit_tunnel_rcv(skb, IPPROTO_MPLS); 801 } 802 #endif 803 804 /* 805 * If the IPv6 address comes from 6rd / 6to4 (RFC 3056) addr space this function 806 * stores the embedded IPv4 address in v4dst and returns true. 807 */ 808 static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst, 809 __be32 *v4dst) 810 { 811 #ifdef CONFIG_IPV6_SIT_6RD 812 if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix, 813 tunnel->ip6rd.prefixlen)) { 814 unsigned int pbw0, pbi0; 815 int pbi1; 816 u32 d; 817 818 pbw0 = tunnel->ip6rd.prefixlen >> 5; 819 pbi0 = tunnel->ip6rd.prefixlen & 0x1f; 820 821 d = tunnel->ip6rd.relay_prefixlen < 32 ? 822 (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >> 823 tunnel->ip6rd.relay_prefixlen : 0; 824 825 pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen; 826 if (pbi1 > 0) 827 d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >> 828 (32 - pbi1); 829 830 *v4dst = tunnel->ip6rd.relay_prefix | htonl(d); 831 return true; 832 } 833 #else 834 if (v6dst->s6_addr16[0] == htons(0x2002)) { 835 /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */ 836 memcpy(v4dst, &v6dst->s6_addr16[1], 4); 837 return true; 838 } 839 #endif 840 return false; 841 } 842 843 static inline __be32 try_6rd(struct ip_tunnel *tunnel, 844 const struct in6_addr *v6dst) 845 { 846 __be32 dst = 0; 847 check_6rd(tunnel, v6dst, &dst); 848 return dst; 849 } 850 851 /* 852 * This function assumes it is being called from dev_queue_xmit() 853 * and that skb is filled properly by that function. 854 */ 855 856 static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb, 857 struct net_device *dev) 858 { 859 struct ip_tunnel *tunnel = netdev_priv(dev); 860 const struct iphdr *tiph = &tunnel->parms.iph; 861 const struct ipv6hdr *iph6 = ipv6_hdr(skb); 862 u8 tos = tunnel->parms.iph.tos; 863 __be16 df = tiph->frag_off; 864 struct rtable *rt; /* Route to the other host */ 865 struct net_device *tdev; /* Device to other host */ 866 unsigned int max_headroom; /* The extra header space needed */ 867 __be32 dst = tiph->daddr; 868 struct flowi4 fl4; 869 int mtu; 870 const struct in6_addr *addr6; 871 int addr_type; 872 u8 ttl; 873 u8 protocol = IPPROTO_IPV6; 874 int t_hlen = tunnel->hlen + sizeof(struct iphdr); 875 876 if (tos == 1) 877 tos = ipv6_get_dsfield(iph6); 878 879 /* ISATAP (RFC4214) - must come before 6to4 */ 880 if (dev->priv_flags & IFF_ISATAP) { 881 struct neighbour *neigh = NULL; 882 bool do_tx_error = false; 883 884 if (skb_dst(skb)) 885 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr); 886 887 if (!neigh) { 888 net_dbg_ratelimited("nexthop == NULL\n"); 889 goto tx_error; 890 } 891 892 addr6 = (const struct in6_addr *)&neigh->primary_key; 893 addr_type = ipv6_addr_type(addr6); 894 895 if ((addr_type & IPV6_ADDR_UNICAST) && 896 ipv6_addr_is_isatap(addr6)) 897 dst = addr6->s6_addr32[3]; 898 else 899 do_tx_error = true; 900 901 neigh_release(neigh); 902 if (do_tx_error) 903 goto tx_error; 904 } 905 906 if (!dst) 907 dst = try_6rd(tunnel, &iph6->daddr); 908 909 if (!dst) { 910 struct neighbour *neigh = NULL; 911 bool do_tx_error = false; 912 913 if (skb_dst(skb)) 914 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr); 915 916 if (!neigh) { 917 net_dbg_ratelimited("nexthop == NULL\n"); 918 goto tx_error; 919 } 920 921 addr6 = (const struct in6_addr *)&neigh->primary_key; 922 addr_type = ipv6_addr_type(addr6); 923 924 if (addr_type == IPV6_ADDR_ANY) { 925 addr6 = &ipv6_hdr(skb)->daddr; 926 addr_type = ipv6_addr_type(addr6); 927 } 928 929 if ((addr_type & IPV6_ADDR_COMPATv4) != 0) 930 dst = addr6->s6_addr32[3]; 931 else 932 do_tx_error = true; 933 934 neigh_release(neigh); 935 if (do_tx_error) 936 goto tx_error; 937 } 938 939 flowi4_init_output(&fl4, tunnel->parms.link, tunnel->fwmark, 940 RT_TOS(tos), RT_SCOPE_UNIVERSE, IPPROTO_IPV6, 941 0, dst, tiph->saddr, 0, 0, 942 sock_net_uid(tunnel->net, NULL)); 943 944 rt = dst_cache_get_ip4(&tunnel->dst_cache, &fl4.saddr); 945 if (!rt) { 946 rt = ip_route_output_flow(tunnel->net, &fl4, NULL); 947 if (IS_ERR(rt)) { 948 dev->stats.tx_carrier_errors++; 949 goto tx_error_icmp; 950 } 951 dst_cache_set_ip4(&tunnel->dst_cache, &rt->dst, fl4.saddr); 952 } 953 954 if (rt->rt_type != RTN_UNICAST) { 955 ip_rt_put(rt); 956 dev->stats.tx_carrier_errors++; 957 goto tx_error_icmp; 958 } 959 tdev = rt->dst.dev; 960 961 if (tdev == dev) { 962 ip_rt_put(rt); 963 dev->stats.collisions++; 964 goto tx_error; 965 } 966 967 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4)) { 968 ip_rt_put(rt); 969 goto tx_error; 970 } 971 972 if (df) { 973 mtu = dst_mtu(&rt->dst) - t_hlen; 974 975 if (mtu < 68) { 976 dev->stats.collisions++; 977 ip_rt_put(rt); 978 goto tx_error; 979 } 980 981 if (mtu < IPV6_MIN_MTU) { 982 mtu = IPV6_MIN_MTU; 983 df = 0; 984 } 985 986 if (tunnel->parms.iph.daddr) 987 skb_dst_update_pmtu_no_confirm(skb, mtu); 988 989 if (skb->len > mtu && !skb_is_gso(skb)) { 990 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 991 ip_rt_put(rt); 992 goto tx_error; 993 } 994 } 995 996 if (tunnel->err_count > 0) { 997 if (time_before(jiffies, 998 tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { 999 tunnel->err_count--; 1000 dst_link_failure(skb); 1001 } else 1002 tunnel->err_count = 0; 1003 } 1004 1005 /* 1006 * Okay, now see if we can stuff it in the buffer as-is. 1007 */ 1008 max_headroom = LL_RESERVED_SPACE(tdev) + t_hlen; 1009 1010 if (skb_headroom(skb) < max_headroom || skb_shared(skb) || 1011 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { 1012 struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); 1013 if (!new_skb) { 1014 ip_rt_put(rt); 1015 dev->stats.tx_dropped++; 1016 kfree_skb(skb); 1017 return NETDEV_TX_OK; 1018 } 1019 if (skb->sk) 1020 skb_set_owner_w(new_skb, skb->sk); 1021 dev_kfree_skb(skb); 1022 skb = new_skb; 1023 iph6 = ipv6_hdr(skb); 1024 } 1025 ttl = tiph->ttl; 1026 if (ttl == 0) 1027 ttl = iph6->hop_limit; 1028 tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6)); 1029 1030 if (ip_tunnel_encap(skb, tunnel, &protocol, &fl4) < 0) { 1031 ip_rt_put(rt); 1032 goto tx_error; 1033 } 1034 1035 skb_set_inner_ipproto(skb, IPPROTO_IPV6); 1036 1037 iptunnel_xmit(NULL, rt, skb, fl4.saddr, fl4.daddr, protocol, tos, ttl, 1038 df, !net_eq(tunnel->net, dev_net(dev))); 1039 return NETDEV_TX_OK; 1040 1041 tx_error_icmp: 1042 dst_link_failure(skb); 1043 tx_error: 1044 kfree_skb(skb); 1045 dev->stats.tx_errors++; 1046 return NETDEV_TX_OK; 1047 } 1048 1049 static netdev_tx_t sit_tunnel_xmit__(struct sk_buff *skb, 1050 struct net_device *dev, u8 ipproto) 1051 { 1052 struct ip_tunnel *tunnel = netdev_priv(dev); 1053 const struct iphdr *tiph = &tunnel->parms.iph; 1054 1055 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4)) 1056 goto tx_error; 1057 1058 skb_set_inner_ipproto(skb, ipproto); 1059 1060 ip_tunnel_xmit(skb, dev, tiph, ipproto); 1061 return NETDEV_TX_OK; 1062 tx_error: 1063 kfree_skb(skb); 1064 dev->stats.tx_errors++; 1065 return NETDEV_TX_OK; 1066 } 1067 1068 static netdev_tx_t sit_tunnel_xmit(struct sk_buff *skb, 1069 struct net_device *dev) 1070 { 1071 if (!pskb_inet_may_pull(skb)) 1072 goto tx_err; 1073 1074 switch (skb->protocol) { 1075 case htons(ETH_P_IP): 1076 sit_tunnel_xmit__(skb, dev, IPPROTO_IPIP); 1077 break; 1078 case htons(ETH_P_IPV6): 1079 ipip6_tunnel_xmit(skb, dev); 1080 break; 1081 #if IS_ENABLED(CONFIG_MPLS) 1082 case htons(ETH_P_MPLS_UC): 1083 sit_tunnel_xmit__(skb, dev, IPPROTO_MPLS); 1084 break; 1085 #endif 1086 default: 1087 goto tx_err; 1088 } 1089 1090 return NETDEV_TX_OK; 1091 1092 tx_err: 1093 dev->stats.tx_errors++; 1094 kfree_skb(skb); 1095 return NETDEV_TX_OK; 1096 1097 } 1098 1099 static void ipip6_tunnel_bind_dev(struct net_device *dev) 1100 { 1101 struct net_device *tdev = NULL; 1102 struct ip_tunnel *tunnel; 1103 const struct iphdr *iph; 1104 struct flowi4 fl4; 1105 1106 tunnel = netdev_priv(dev); 1107 iph = &tunnel->parms.iph; 1108 1109 if (iph->daddr) { 1110 struct rtable *rt = ip_route_output_ports(tunnel->net, &fl4, 1111 NULL, 1112 iph->daddr, iph->saddr, 1113 0, 0, 1114 IPPROTO_IPV6, 1115 RT_TOS(iph->tos), 1116 tunnel->parms.link); 1117 1118 if (!IS_ERR(rt)) { 1119 tdev = rt->dst.dev; 1120 ip_rt_put(rt); 1121 } 1122 dev->flags |= IFF_POINTOPOINT; 1123 } 1124 1125 if (!tdev && tunnel->parms.link) 1126 tdev = __dev_get_by_index(tunnel->net, tunnel->parms.link); 1127 1128 if (tdev && !netif_is_l3_master(tdev)) { 1129 int t_hlen = tunnel->hlen + sizeof(struct iphdr); 1130 1131 dev->mtu = tdev->mtu - t_hlen; 1132 if (dev->mtu < IPV6_MIN_MTU) 1133 dev->mtu = IPV6_MIN_MTU; 1134 } 1135 } 1136 1137 static void ipip6_tunnel_update(struct ip_tunnel *t, struct ip_tunnel_parm *p, 1138 __u32 fwmark) 1139 { 1140 struct net *net = t->net; 1141 struct sit_net *sitn = net_generic(net, sit_net_id); 1142 1143 ipip6_tunnel_unlink(sitn, t); 1144 synchronize_net(); 1145 t->parms.iph.saddr = p->iph.saddr; 1146 t->parms.iph.daddr = p->iph.daddr; 1147 memcpy(t->dev->dev_addr, &p->iph.saddr, 4); 1148 memcpy(t->dev->broadcast, &p->iph.daddr, 4); 1149 ipip6_tunnel_link(sitn, t); 1150 t->parms.iph.ttl = p->iph.ttl; 1151 t->parms.iph.tos = p->iph.tos; 1152 t->parms.iph.frag_off = p->iph.frag_off; 1153 if (t->parms.link != p->link || t->fwmark != fwmark) { 1154 t->parms.link = p->link; 1155 t->fwmark = fwmark; 1156 ipip6_tunnel_bind_dev(t->dev); 1157 } 1158 dst_cache_reset(&t->dst_cache); 1159 netdev_state_change(t->dev); 1160 } 1161 1162 #ifdef CONFIG_IPV6_SIT_6RD 1163 static int ipip6_tunnel_update_6rd(struct ip_tunnel *t, 1164 struct ip_tunnel_6rd *ip6rd) 1165 { 1166 struct in6_addr prefix; 1167 __be32 relay_prefix; 1168 1169 if (ip6rd->relay_prefixlen > 32 || 1170 ip6rd->prefixlen + (32 - ip6rd->relay_prefixlen) > 64) 1171 return -EINVAL; 1172 1173 ipv6_addr_prefix(&prefix, &ip6rd->prefix, ip6rd->prefixlen); 1174 if (!ipv6_addr_equal(&prefix, &ip6rd->prefix)) 1175 return -EINVAL; 1176 if (ip6rd->relay_prefixlen) 1177 relay_prefix = ip6rd->relay_prefix & 1178 htonl(0xffffffffUL << 1179 (32 - ip6rd->relay_prefixlen)); 1180 else 1181 relay_prefix = 0; 1182 if (relay_prefix != ip6rd->relay_prefix) 1183 return -EINVAL; 1184 1185 t->ip6rd.prefix = prefix; 1186 t->ip6rd.relay_prefix = relay_prefix; 1187 t->ip6rd.prefixlen = ip6rd->prefixlen; 1188 t->ip6rd.relay_prefixlen = ip6rd->relay_prefixlen; 1189 dst_cache_reset(&t->dst_cache); 1190 netdev_state_change(t->dev); 1191 return 0; 1192 } 1193 1194 static int 1195 ipip6_tunnel_get6rd(struct net_device *dev, struct ifreq *ifr) 1196 { 1197 struct ip_tunnel *t = netdev_priv(dev); 1198 struct ip_tunnel_6rd ip6rd; 1199 struct ip_tunnel_parm p; 1200 1201 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) { 1202 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 1203 return -EFAULT; 1204 t = ipip6_tunnel_locate(t->net, &p, 0); 1205 } 1206 if (!t) 1207 t = netdev_priv(dev); 1208 1209 ip6rd.prefix = t->ip6rd.prefix; 1210 ip6rd.relay_prefix = t->ip6rd.relay_prefix; 1211 ip6rd.prefixlen = t->ip6rd.prefixlen; 1212 ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen; 1213 if (copy_to_user(ifr->ifr_ifru.ifru_data, &ip6rd, sizeof(ip6rd))) 1214 return -EFAULT; 1215 return 0; 1216 } 1217 1218 static int 1219 ipip6_tunnel_6rdctl(struct net_device *dev, struct ifreq *ifr, int cmd) 1220 { 1221 struct ip_tunnel *t = netdev_priv(dev); 1222 struct ip_tunnel_6rd ip6rd; 1223 int err; 1224 1225 if (!ns_capable(t->net->user_ns, CAP_NET_ADMIN)) 1226 return -EPERM; 1227 if (copy_from_user(&ip6rd, ifr->ifr_ifru.ifru_data, sizeof(ip6rd))) 1228 return -EFAULT; 1229 1230 if (cmd != SIOCDEL6RD) { 1231 err = ipip6_tunnel_update_6rd(t, &ip6rd); 1232 if (err < 0) 1233 return err; 1234 } else 1235 ipip6_tunnel_clone_6rd(dev, dev_to_sit_net(dev)); 1236 return 0; 1237 } 1238 1239 #endif /* CONFIG_IPV6_SIT_6RD */ 1240 1241 static bool ipip6_valid_ip_proto(u8 ipproto) 1242 { 1243 return ipproto == IPPROTO_IPV6 || 1244 ipproto == IPPROTO_IPIP || 1245 #if IS_ENABLED(CONFIG_MPLS) 1246 ipproto == IPPROTO_MPLS || 1247 #endif 1248 ipproto == 0; 1249 } 1250 1251 static int 1252 __ipip6_tunnel_ioctl_validate(struct net *net, struct ip_tunnel_parm *p) 1253 { 1254 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1255 return -EPERM; 1256 1257 if (!ipip6_valid_ip_proto(p->iph.protocol)) 1258 return -EINVAL; 1259 if (p->iph.version != 4 || 1260 p->iph.ihl != 5 || (p->iph.frag_off & htons(~IP_DF))) 1261 return -EINVAL; 1262 1263 if (p->iph.ttl) 1264 p->iph.frag_off |= htons(IP_DF); 1265 return 0; 1266 } 1267 1268 static int 1269 ipip6_tunnel_get(struct net_device *dev, struct ip_tunnel_parm *p) 1270 { 1271 struct ip_tunnel *t = netdev_priv(dev); 1272 1273 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) 1274 t = ipip6_tunnel_locate(t->net, p, 0); 1275 if (!t) 1276 t = netdev_priv(dev); 1277 memcpy(p, &t->parms, sizeof(*p)); 1278 return 0; 1279 } 1280 1281 static int 1282 ipip6_tunnel_add(struct net_device *dev, struct ip_tunnel_parm *p) 1283 { 1284 struct ip_tunnel *t = netdev_priv(dev); 1285 int err; 1286 1287 err = __ipip6_tunnel_ioctl_validate(t->net, p); 1288 if (err) 1289 return err; 1290 1291 t = ipip6_tunnel_locate(t->net, p, 1); 1292 if (!t) 1293 return -ENOBUFS; 1294 return 0; 1295 } 1296 1297 static int 1298 ipip6_tunnel_change(struct net_device *dev, struct ip_tunnel_parm *p) 1299 { 1300 struct ip_tunnel *t = netdev_priv(dev); 1301 int err; 1302 1303 err = __ipip6_tunnel_ioctl_validate(t->net, p); 1304 if (err) 1305 return err; 1306 1307 t = ipip6_tunnel_locate(t->net, p, 0); 1308 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) { 1309 if (!t) 1310 return -ENOENT; 1311 } else { 1312 if (t) { 1313 if (t->dev != dev) 1314 return -EEXIST; 1315 } else { 1316 if (((dev->flags & IFF_POINTOPOINT) && !p->iph.daddr) || 1317 (!(dev->flags & IFF_POINTOPOINT) && p->iph.daddr)) 1318 return -EINVAL; 1319 t = netdev_priv(dev); 1320 } 1321 1322 ipip6_tunnel_update(t, p, t->fwmark); 1323 } 1324 1325 return 0; 1326 } 1327 1328 static int 1329 ipip6_tunnel_del(struct net_device *dev, struct ip_tunnel_parm *p) 1330 { 1331 struct ip_tunnel *t = netdev_priv(dev); 1332 1333 if (!ns_capable(t->net->user_ns, CAP_NET_ADMIN)) 1334 return -EPERM; 1335 1336 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) { 1337 t = ipip6_tunnel_locate(t->net, p, 0); 1338 if (!t) 1339 return -ENOENT; 1340 if (t == netdev_priv(dev_to_sit_net(dev)->fb_tunnel_dev)) 1341 return -EPERM; 1342 dev = t->dev; 1343 } 1344 unregister_netdevice(dev); 1345 return 0; 1346 } 1347 1348 static int 1349 ipip6_tunnel_ctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd) 1350 { 1351 switch (cmd) { 1352 case SIOCGETTUNNEL: 1353 return ipip6_tunnel_get(dev, p); 1354 case SIOCADDTUNNEL: 1355 return ipip6_tunnel_add(dev, p); 1356 case SIOCCHGTUNNEL: 1357 return ipip6_tunnel_change(dev, p); 1358 case SIOCDELTUNNEL: 1359 return ipip6_tunnel_del(dev, p); 1360 default: 1361 return -EINVAL; 1362 } 1363 } 1364 1365 static int 1366 ipip6_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) 1367 { 1368 switch (cmd) { 1369 case SIOCGETTUNNEL: 1370 case SIOCADDTUNNEL: 1371 case SIOCCHGTUNNEL: 1372 case SIOCDELTUNNEL: 1373 return ip_tunnel_ioctl(dev, ifr, cmd); 1374 case SIOCGETPRL: 1375 return ipip6_tunnel_get_prl(dev, ifr); 1376 case SIOCADDPRL: 1377 case SIOCDELPRL: 1378 case SIOCCHGPRL: 1379 return ipip6_tunnel_prl_ctl(dev, ifr, cmd); 1380 #ifdef CONFIG_IPV6_SIT_6RD 1381 case SIOCGET6RD: 1382 return ipip6_tunnel_get6rd(dev, ifr); 1383 case SIOCADD6RD: 1384 case SIOCCHG6RD: 1385 case SIOCDEL6RD: 1386 return ipip6_tunnel_6rdctl(dev, ifr, cmd); 1387 #endif 1388 default: 1389 return -EINVAL; 1390 } 1391 } 1392 1393 static const struct net_device_ops ipip6_netdev_ops = { 1394 .ndo_init = ipip6_tunnel_init, 1395 .ndo_uninit = ipip6_tunnel_uninit, 1396 .ndo_start_xmit = sit_tunnel_xmit, 1397 .ndo_do_ioctl = ipip6_tunnel_ioctl, 1398 .ndo_get_stats64 = dev_get_tstats64, 1399 .ndo_get_iflink = ip_tunnel_get_iflink, 1400 .ndo_tunnel_ctl = ipip6_tunnel_ctl, 1401 }; 1402 1403 static void ipip6_dev_free(struct net_device *dev) 1404 { 1405 struct ip_tunnel *tunnel = netdev_priv(dev); 1406 1407 dst_cache_destroy(&tunnel->dst_cache); 1408 free_percpu(dev->tstats); 1409 } 1410 1411 #define SIT_FEATURES (NETIF_F_SG | \ 1412 NETIF_F_FRAGLIST | \ 1413 NETIF_F_HIGHDMA | \ 1414 NETIF_F_GSO_SOFTWARE | \ 1415 NETIF_F_HW_CSUM) 1416 1417 static void ipip6_tunnel_setup(struct net_device *dev) 1418 { 1419 struct ip_tunnel *tunnel = netdev_priv(dev); 1420 int t_hlen = tunnel->hlen + sizeof(struct iphdr); 1421 1422 dev->netdev_ops = &ipip6_netdev_ops; 1423 dev->header_ops = &ip_tunnel_header_ops; 1424 dev->needs_free_netdev = true; 1425 dev->priv_destructor = ipip6_dev_free; 1426 1427 dev->type = ARPHRD_SIT; 1428 dev->mtu = ETH_DATA_LEN - t_hlen; 1429 dev->min_mtu = IPV6_MIN_MTU; 1430 dev->max_mtu = IP6_MAX_MTU - t_hlen; 1431 dev->flags = IFF_NOARP; 1432 netif_keep_dst(dev); 1433 dev->addr_len = 4; 1434 dev->features |= NETIF_F_LLTX; 1435 dev->features |= SIT_FEATURES; 1436 dev->hw_features |= SIT_FEATURES; 1437 } 1438 1439 static int ipip6_tunnel_init(struct net_device *dev) 1440 { 1441 struct ip_tunnel *tunnel = netdev_priv(dev); 1442 int err; 1443 1444 tunnel->dev = dev; 1445 tunnel->net = dev_net(dev); 1446 strcpy(tunnel->parms.name, dev->name); 1447 1448 ipip6_tunnel_bind_dev(dev); 1449 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 1450 if (!dev->tstats) 1451 return -ENOMEM; 1452 1453 err = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); 1454 if (err) { 1455 free_percpu(dev->tstats); 1456 dev->tstats = NULL; 1457 return err; 1458 } 1459 1460 return 0; 1461 } 1462 1463 static void __net_init ipip6_fb_tunnel_init(struct net_device *dev) 1464 { 1465 struct ip_tunnel *tunnel = netdev_priv(dev); 1466 struct iphdr *iph = &tunnel->parms.iph; 1467 struct net *net = dev_net(dev); 1468 struct sit_net *sitn = net_generic(net, sit_net_id); 1469 1470 iph->version = 4; 1471 iph->protocol = IPPROTO_IPV6; 1472 iph->ihl = 5; 1473 iph->ttl = 64; 1474 1475 dev_hold(dev); 1476 rcu_assign_pointer(sitn->tunnels_wc[0], tunnel); 1477 } 1478 1479 static int ipip6_validate(struct nlattr *tb[], struct nlattr *data[], 1480 struct netlink_ext_ack *extack) 1481 { 1482 u8 proto; 1483 1484 if (!data || !data[IFLA_IPTUN_PROTO]) 1485 return 0; 1486 1487 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); 1488 if (!ipip6_valid_ip_proto(proto)) 1489 return -EINVAL; 1490 1491 return 0; 1492 } 1493 1494 static void ipip6_netlink_parms(struct nlattr *data[], 1495 struct ip_tunnel_parm *parms, 1496 __u32 *fwmark) 1497 { 1498 memset(parms, 0, sizeof(*parms)); 1499 1500 parms->iph.version = 4; 1501 parms->iph.protocol = IPPROTO_IPV6; 1502 parms->iph.ihl = 5; 1503 parms->iph.ttl = 64; 1504 1505 if (!data) 1506 return; 1507 1508 if (data[IFLA_IPTUN_LINK]) 1509 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]); 1510 1511 if (data[IFLA_IPTUN_LOCAL]) 1512 parms->iph.saddr = nla_get_be32(data[IFLA_IPTUN_LOCAL]); 1513 1514 if (data[IFLA_IPTUN_REMOTE]) 1515 parms->iph.daddr = nla_get_be32(data[IFLA_IPTUN_REMOTE]); 1516 1517 if (data[IFLA_IPTUN_TTL]) { 1518 parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]); 1519 if (parms->iph.ttl) 1520 parms->iph.frag_off = htons(IP_DF); 1521 } 1522 1523 if (data[IFLA_IPTUN_TOS]) 1524 parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]); 1525 1526 if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC])) 1527 parms->iph.frag_off = htons(IP_DF); 1528 1529 if (data[IFLA_IPTUN_FLAGS]) 1530 parms->i_flags = nla_get_be16(data[IFLA_IPTUN_FLAGS]); 1531 1532 if (data[IFLA_IPTUN_PROTO]) 1533 parms->iph.protocol = nla_get_u8(data[IFLA_IPTUN_PROTO]); 1534 1535 if (data[IFLA_IPTUN_FWMARK]) 1536 *fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]); 1537 } 1538 1539 /* This function returns true when ENCAP attributes are present in the nl msg */ 1540 static bool ipip6_netlink_encap_parms(struct nlattr *data[], 1541 struct ip_tunnel_encap *ipencap) 1542 { 1543 bool ret = false; 1544 1545 memset(ipencap, 0, sizeof(*ipencap)); 1546 1547 if (!data) 1548 return ret; 1549 1550 if (data[IFLA_IPTUN_ENCAP_TYPE]) { 1551 ret = true; 1552 ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]); 1553 } 1554 1555 if (data[IFLA_IPTUN_ENCAP_FLAGS]) { 1556 ret = true; 1557 ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]); 1558 } 1559 1560 if (data[IFLA_IPTUN_ENCAP_SPORT]) { 1561 ret = true; 1562 ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]); 1563 } 1564 1565 if (data[IFLA_IPTUN_ENCAP_DPORT]) { 1566 ret = true; 1567 ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]); 1568 } 1569 1570 return ret; 1571 } 1572 1573 #ifdef CONFIG_IPV6_SIT_6RD 1574 /* This function returns true when 6RD attributes are present in the nl msg */ 1575 static bool ipip6_netlink_6rd_parms(struct nlattr *data[], 1576 struct ip_tunnel_6rd *ip6rd) 1577 { 1578 bool ret = false; 1579 memset(ip6rd, 0, sizeof(*ip6rd)); 1580 1581 if (!data) 1582 return ret; 1583 1584 if (data[IFLA_IPTUN_6RD_PREFIX]) { 1585 ret = true; 1586 ip6rd->prefix = nla_get_in6_addr(data[IFLA_IPTUN_6RD_PREFIX]); 1587 } 1588 1589 if (data[IFLA_IPTUN_6RD_RELAY_PREFIX]) { 1590 ret = true; 1591 ip6rd->relay_prefix = 1592 nla_get_be32(data[IFLA_IPTUN_6RD_RELAY_PREFIX]); 1593 } 1594 1595 if (data[IFLA_IPTUN_6RD_PREFIXLEN]) { 1596 ret = true; 1597 ip6rd->prefixlen = nla_get_u16(data[IFLA_IPTUN_6RD_PREFIXLEN]); 1598 } 1599 1600 if (data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]) { 1601 ret = true; 1602 ip6rd->relay_prefixlen = 1603 nla_get_u16(data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]); 1604 } 1605 1606 return ret; 1607 } 1608 #endif 1609 1610 static int ipip6_newlink(struct net *src_net, struct net_device *dev, 1611 struct nlattr *tb[], struct nlattr *data[], 1612 struct netlink_ext_ack *extack) 1613 { 1614 struct net *net = dev_net(dev); 1615 struct ip_tunnel *nt; 1616 struct ip_tunnel_encap ipencap; 1617 #ifdef CONFIG_IPV6_SIT_6RD 1618 struct ip_tunnel_6rd ip6rd; 1619 #endif 1620 int err; 1621 1622 nt = netdev_priv(dev); 1623 1624 if (ipip6_netlink_encap_parms(data, &ipencap)) { 1625 err = ip_tunnel_encap_setup(nt, &ipencap); 1626 if (err < 0) 1627 return err; 1628 } 1629 1630 ipip6_netlink_parms(data, &nt->parms, &nt->fwmark); 1631 1632 if (ipip6_tunnel_locate(net, &nt->parms, 0)) 1633 return -EEXIST; 1634 1635 err = ipip6_tunnel_create(dev); 1636 if (err < 0) 1637 return err; 1638 1639 if (tb[IFLA_MTU]) { 1640 u32 mtu = nla_get_u32(tb[IFLA_MTU]); 1641 1642 if (mtu >= IPV6_MIN_MTU && 1643 mtu <= IP6_MAX_MTU - dev->hard_header_len) 1644 dev->mtu = mtu; 1645 } 1646 1647 #ifdef CONFIG_IPV6_SIT_6RD 1648 if (ipip6_netlink_6rd_parms(data, &ip6rd)) { 1649 err = ipip6_tunnel_update_6rd(nt, &ip6rd); 1650 if (err < 0) 1651 unregister_netdevice_queue(dev, NULL); 1652 } 1653 #endif 1654 1655 return err; 1656 } 1657 1658 static int ipip6_changelink(struct net_device *dev, struct nlattr *tb[], 1659 struct nlattr *data[], 1660 struct netlink_ext_ack *extack) 1661 { 1662 struct ip_tunnel *t = netdev_priv(dev); 1663 struct ip_tunnel_parm p; 1664 struct ip_tunnel_encap ipencap; 1665 struct net *net = t->net; 1666 struct sit_net *sitn = net_generic(net, sit_net_id); 1667 #ifdef CONFIG_IPV6_SIT_6RD 1668 struct ip_tunnel_6rd ip6rd; 1669 #endif 1670 __u32 fwmark = t->fwmark; 1671 int err; 1672 1673 if (dev == sitn->fb_tunnel_dev) 1674 return -EINVAL; 1675 1676 if (ipip6_netlink_encap_parms(data, &ipencap)) { 1677 err = ip_tunnel_encap_setup(t, &ipencap); 1678 if (err < 0) 1679 return err; 1680 } 1681 1682 ipip6_netlink_parms(data, &p, &fwmark); 1683 1684 if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) || 1685 (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr)) 1686 return -EINVAL; 1687 1688 t = ipip6_tunnel_locate(net, &p, 0); 1689 1690 if (t) { 1691 if (t->dev != dev) 1692 return -EEXIST; 1693 } else 1694 t = netdev_priv(dev); 1695 1696 ipip6_tunnel_update(t, &p, fwmark); 1697 1698 #ifdef CONFIG_IPV6_SIT_6RD 1699 if (ipip6_netlink_6rd_parms(data, &ip6rd)) 1700 return ipip6_tunnel_update_6rd(t, &ip6rd); 1701 #endif 1702 1703 return 0; 1704 } 1705 1706 static size_t ipip6_get_size(const struct net_device *dev) 1707 { 1708 return 1709 /* IFLA_IPTUN_LINK */ 1710 nla_total_size(4) + 1711 /* IFLA_IPTUN_LOCAL */ 1712 nla_total_size(4) + 1713 /* IFLA_IPTUN_REMOTE */ 1714 nla_total_size(4) + 1715 /* IFLA_IPTUN_TTL */ 1716 nla_total_size(1) + 1717 /* IFLA_IPTUN_TOS */ 1718 nla_total_size(1) + 1719 /* IFLA_IPTUN_PMTUDISC */ 1720 nla_total_size(1) + 1721 /* IFLA_IPTUN_FLAGS */ 1722 nla_total_size(2) + 1723 /* IFLA_IPTUN_PROTO */ 1724 nla_total_size(1) + 1725 #ifdef CONFIG_IPV6_SIT_6RD 1726 /* IFLA_IPTUN_6RD_PREFIX */ 1727 nla_total_size(sizeof(struct in6_addr)) + 1728 /* IFLA_IPTUN_6RD_RELAY_PREFIX */ 1729 nla_total_size(4) + 1730 /* IFLA_IPTUN_6RD_PREFIXLEN */ 1731 nla_total_size(2) + 1732 /* IFLA_IPTUN_6RD_RELAY_PREFIXLEN */ 1733 nla_total_size(2) + 1734 #endif 1735 /* IFLA_IPTUN_ENCAP_TYPE */ 1736 nla_total_size(2) + 1737 /* IFLA_IPTUN_ENCAP_FLAGS */ 1738 nla_total_size(2) + 1739 /* IFLA_IPTUN_ENCAP_SPORT */ 1740 nla_total_size(2) + 1741 /* IFLA_IPTUN_ENCAP_DPORT */ 1742 nla_total_size(2) + 1743 /* IFLA_IPTUN_FWMARK */ 1744 nla_total_size(4) + 1745 0; 1746 } 1747 1748 static int ipip6_fill_info(struct sk_buff *skb, const struct net_device *dev) 1749 { 1750 struct ip_tunnel *tunnel = netdev_priv(dev); 1751 struct ip_tunnel_parm *parm = &tunnel->parms; 1752 1753 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || 1754 nla_put_in_addr(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) || 1755 nla_put_in_addr(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) || 1756 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) || 1757 nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) || 1758 nla_put_u8(skb, IFLA_IPTUN_PMTUDISC, 1759 !!(parm->iph.frag_off & htons(IP_DF))) || 1760 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->iph.protocol) || 1761 nla_put_be16(skb, IFLA_IPTUN_FLAGS, parm->i_flags) || 1762 nla_put_u32(skb, IFLA_IPTUN_FWMARK, tunnel->fwmark)) 1763 goto nla_put_failure; 1764 1765 #ifdef CONFIG_IPV6_SIT_6RD 1766 if (nla_put_in6_addr(skb, IFLA_IPTUN_6RD_PREFIX, 1767 &tunnel->ip6rd.prefix) || 1768 nla_put_in_addr(skb, IFLA_IPTUN_6RD_RELAY_PREFIX, 1769 tunnel->ip6rd.relay_prefix) || 1770 nla_put_u16(skb, IFLA_IPTUN_6RD_PREFIXLEN, 1771 tunnel->ip6rd.prefixlen) || 1772 nla_put_u16(skb, IFLA_IPTUN_6RD_RELAY_PREFIXLEN, 1773 tunnel->ip6rd.relay_prefixlen)) 1774 goto nla_put_failure; 1775 #endif 1776 1777 if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE, 1778 tunnel->encap.type) || 1779 nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT, 1780 tunnel->encap.sport) || 1781 nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT, 1782 tunnel->encap.dport) || 1783 nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS, 1784 tunnel->encap.flags)) 1785 goto nla_put_failure; 1786 1787 return 0; 1788 1789 nla_put_failure: 1790 return -EMSGSIZE; 1791 } 1792 1793 static const struct nla_policy ipip6_policy[IFLA_IPTUN_MAX + 1] = { 1794 [IFLA_IPTUN_LINK] = { .type = NLA_U32 }, 1795 [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 }, 1796 [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 }, 1797 [IFLA_IPTUN_TTL] = { .type = NLA_U8 }, 1798 [IFLA_IPTUN_TOS] = { .type = NLA_U8 }, 1799 [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 }, 1800 [IFLA_IPTUN_FLAGS] = { .type = NLA_U16 }, 1801 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 }, 1802 #ifdef CONFIG_IPV6_SIT_6RD 1803 [IFLA_IPTUN_6RD_PREFIX] = { .len = sizeof(struct in6_addr) }, 1804 [IFLA_IPTUN_6RD_RELAY_PREFIX] = { .type = NLA_U32 }, 1805 [IFLA_IPTUN_6RD_PREFIXLEN] = { .type = NLA_U16 }, 1806 [IFLA_IPTUN_6RD_RELAY_PREFIXLEN] = { .type = NLA_U16 }, 1807 #endif 1808 [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 }, 1809 [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 }, 1810 [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 }, 1811 [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 }, 1812 [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 }, 1813 }; 1814 1815 static void ipip6_dellink(struct net_device *dev, struct list_head *head) 1816 { 1817 struct net *net = dev_net(dev); 1818 struct sit_net *sitn = net_generic(net, sit_net_id); 1819 1820 if (dev != sitn->fb_tunnel_dev) 1821 unregister_netdevice_queue(dev, head); 1822 } 1823 1824 static struct rtnl_link_ops sit_link_ops __read_mostly = { 1825 .kind = "sit", 1826 .maxtype = IFLA_IPTUN_MAX, 1827 .policy = ipip6_policy, 1828 .priv_size = sizeof(struct ip_tunnel), 1829 .setup = ipip6_tunnel_setup, 1830 .validate = ipip6_validate, 1831 .newlink = ipip6_newlink, 1832 .changelink = ipip6_changelink, 1833 .get_size = ipip6_get_size, 1834 .fill_info = ipip6_fill_info, 1835 .dellink = ipip6_dellink, 1836 .get_link_net = ip_tunnel_get_link_net, 1837 }; 1838 1839 static struct xfrm_tunnel sit_handler __read_mostly = { 1840 .handler = ipip6_rcv, 1841 .err_handler = ipip6_err, 1842 .priority = 1, 1843 }; 1844 1845 static struct xfrm_tunnel ipip_handler __read_mostly = { 1846 .handler = ipip_rcv, 1847 .err_handler = ipip6_err, 1848 .priority = 2, 1849 }; 1850 1851 #if IS_ENABLED(CONFIG_MPLS) 1852 static struct xfrm_tunnel mplsip_handler __read_mostly = { 1853 .handler = mplsip_rcv, 1854 .err_handler = ipip6_err, 1855 .priority = 2, 1856 }; 1857 #endif 1858 1859 static void __net_exit sit_destroy_tunnels(struct net *net, 1860 struct list_head *head) 1861 { 1862 struct sit_net *sitn = net_generic(net, sit_net_id); 1863 struct net_device *dev, *aux; 1864 int prio; 1865 1866 for_each_netdev_safe(net, dev, aux) 1867 if (dev->rtnl_link_ops == &sit_link_ops) 1868 unregister_netdevice_queue(dev, head); 1869 1870 for (prio = 1; prio < 4; prio++) { 1871 int h; 1872 for (h = 0; h < IP6_SIT_HASH_SIZE; h++) { 1873 struct ip_tunnel *t; 1874 1875 t = rtnl_dereference(sitn->tunnels[prio][h]); 1876 while (t) { 1877 /* If dev is in the same netns, it has already 1878 * been added to the list by the previous loop. 1879 */ 1880 if (!net_eq(dev_net(t->dev), net)) 1881 unregister_netdevice_queue(t->dev, 1882 head); 1883 t = rtnl_dereference(t->next); 1884 } 1885 } 1886 } 1887 } 1888 1889 static int __net_init sit_init_net(struct net *net) 1890 { 1891 struct sit_net *sitn = net_generic(net, sit_net_id); 1892 struct ip_tunnel *t; 1893 int err; 1894 1895 sitn->tunnels[0] = sitn->tunnels_wc; 1896 sitn->tunnels[1] = sitn->tunnels_l; 1897 sitn->tunnels[2] = sitn->tunnels_r; 1898 sitn->tunnels[3] = sitn->tunnels_r_l; 1899 1900 if (!net_has_fallback_tunnels(net)) 1901 return 0; 1902 1903 sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0", 1904 NET_NAME_UNKNOWN, 1905 ipip6_tunnel_setup); 1906 if (!sitn->fb_tunnel_dev) { 1907 err = -ENOMEM; 1908 goto err_alloc_dev; 1909 } 1910 dev_net_set(sitn->fb_tunnel_dev, net); 1911 sitn->fb_tunnel_dev->rtnl_link_ops = &sit_link_ops; 1912 /* FB netdevice is special: we have one, and only one per netns. 1913 * Allowing to move it to another netns is clearly unsafe. 1914 */ 1915 sitn->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL; 1916 1917 err = register_netdev(sitn->fb_tunnel_dev); 1918 if (err) 1919 goto err_reg_dev; 1920 1921 ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn); 1922 ipip6_fb_tunnel_init(sitn->fb_tunnel_dev); 1923 1924 t = netdev_priv(sitn->fb_tunnel_dev); 1925 1926 strcpy(t->parms.name, sitn->fb_tunnel_dev->name); 1927 return 0; 1928 1929 err_reg_dev: 1930 ipip6_dev_free(sitn->fb_tunnel_dev); 1931 free_netdev(sitn->fb_tunnel_dev); 1932 err_alloc_dev: 1933 return err; 1934 } 1935 1936 static void __net_exit sit_exit_batch_net(struct list_head *net_list) 1937 { 1938 LIST_HEAD(list); 1939 struct net *net; 1940 1941 rtnl_lock(); 1942 list_for_each_entry(net, net_list, exit_list) 1943 sit_destroy_tunnels(net, &list); 1944 1945 unregister_netdevice_many(&list); 1946 rtnl_unlock(); 1947 } 1948 1949 static struct pernet_operations sit_net_ops = { 1950 .init = sit_init_net, 1951 .exit_batch = sit_exit_batch_net, 1952 .id = &sit_net_id, 1953 .size = sizeof(struct sit_net), 1954 }; 1955 1956 static void __exit sit_cleanup(void) 1957 { 1958 rtnl_link_unregister(&sit_link_ops); 1959 xfrm4_tunnel_deregister(&sit_handler, AF_INET6); 1960 xfrm4_tunnel_deregister(&ipip_handler, AF_INET); 1961 #if IS_ENABLED(CONFIG_MPLS) 1962 xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS); 1963 #endif 1964 1965 unregister_pernet_device(&sit_net_ops); 1966 rcu_barrier(); /* Wait for completion of call_rcu()'s */ 1967 } 1968 1969 static int __init sit_init(void) 1970 { 1971 int err; 1972 1973 pr_info("IPv6, IPv4 and MPLS over IPv4 tunneling driver\n"); 1974 1975 err = register_pernet_device(&sit_net_ops); 1976 if (err < 0) 1977 return err; 1978 err = xfrm4_tunnel_register(&sit_handler, AF_INET6); 1979 if (err < 0) { 1980 pr_info("%s: can't register ip6ip4\n", __func__); 1981 goto xfrm_tunnel_failed; 1982 } 1983 err = xfrm4_tunnel_register(&ipip_handler, AF_INET); 1984 if (err < 0) { 1985 pr_info("%s: can't register ip4ip4\n", __func__); 1986 goto xfrm_tunnel4_failed; 1987 } 1988 #if IS_ENABLED(CONFIG_MPLS) 1989 err = xfrm4_tunnel_register(&mplsip_handler, AF_MPLS); 1990 if (err < 0) { 1991 pr_info("%s: can't register mplsip\n", __func__); 1992 goto xfrm_tunnel_mpls_failed; 1993 } 1994 #endif 1995 err = rtnl_link_register(&sit_link_ops); 1996 if (err < 0) 1997 goto rtnl_link_failed; 1998 1999 out: 2000 return err; 2001 2002 rtnl_link_failed: 2003 #if IS_ENABLED(CONFIG_MPLS) 2004 xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS); 2005 xfrm_tunnel_mpls_failed: 2006 #endif 2007 xfrm4_tunnel_deregister(&ipip_handler, AF_INET); 2008 xfrm_tunnel4_failed: 2009 xfrm4_tunnel_deregister(&sit_handler, AF_INET6); 2010 xfrm_tunnel_failed: 2011 unregister_pernet_device(&sit_net_ops); 2012 goto out; 2013 } 2014 2015 module_init(sit_init); 2016 module_exit(sit_cleanup); 2017 MODULE_LICENSE("GPL"); 2018 MODULE_ALIAS_RTNL_LINK("sit"); 2019 MODULE_ALIAS_NETDEV("sit0"); 2020