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 __dev_addr_set(dev, &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 ipip6_tunnel_link(sitn, t); 222 return 0; 223 224 out: 225 return err; 226 } 227 228 static struct ip_tunnel *ipip6_tunnel_locate(struct net *net, 229 struct ip_tunnel_parm *parms, int create) 230 { 231 __be32 remote = parms->iph.daddr; 232 __be32 local = parms->iph.saddr; 233 struct ip_tunnel *t, *nt; 234 struct ip_tunnel __rcu **tp; 235 struct net_device *dev; 236 char name[IFNAMSIZ]; 237 struct sit_net *sitn = net_generic(net, sit_net_id); 238 239 for (tp = __ipip6_bucket(sitn, parms); 240 (t = rtnl_dereference(*tp)) != NULL; 241 tp = &t->next) { 242 if (local == t->parms.iph.saddr && 243 remote == t->parms.iph.daddr && 244 parms->link == t->parms.link) { 245 if (create) 246 return NULL; 247 else 248 return t; 249 } 250 } 251 if (!create) 252 goto failed; 253 254 if (parms->name[0]) { 255 if (!dev_valid_name(parms->name)) 256 goto failed; 257 strlcpy(name, parms->name, IFNAMSIZ); 258 } else { 259 strcpy(name, "sit%d"); 260 } 261 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, 262 ipip6_tunnel_setup); 263 if (!dev) 264 return NULL; 265 266 dev_net_set(dev, net); 267 268 nt = netdev_priv(dev); 269 270 nt->parms = *parms; 271 if (ipip6_tunnel_create(dev) < 0) 272 goto failed_free; 273 274 if (!parms->name[0]) 275 strcpy(parms->name, dev->name); 276 277 return nt; 278 279 failed_free: 280 free_netdev(dev); 281 failed: 282 return NULL; 283 } 284 285 #define for_each_prl_rcu(start) \ 286 for (prl = rcu_dereference(start); \ 287 prl; \ 288 prl = rcu_dereference(prl->next)) 289 290 static struct ip_tunnel_prl_entry * 291 __ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr) 292 { 293 struct ip_tunnel_prl_entry *prl; 294 295 for_each_prl_rcu(t->prl) 296 if (prl->addr == addr) 297 break; 298 return prl; 299 300 } 301 302 static int ipip6_tunnel_get_prl(struct net_device *dev, struct ip_tunnel_prl __user *a) 303 { 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_ACCOUNT | __GFP_NOWARN) : 324 NULL; 325 326 ca = min(t->prl_count, cmax); 327 328 if (!kp) { 329 /* We don't try hard to allocate much memory for 330 * non-root users. 331 * For root users, retry allocating enough memory for 332 * the answer. 333 */ 334 kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC | __GFP_ACCOUNT | 335 __GFP_NOWARN); 336 if (!kp) { 337 ret = -ENOMEM; 338 goto out; 339 } 340 } 341 342 rcu_read_lock(); 343 for_each_prl_rcu(t->prl) { 344 if (c >= cmax) 345 break; 346 if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr) 347 continue; 348 kp[c].addr = prl->addr; 349 kp[c].flags = prl->flags; 350 c++; 351 if (kprl.addr != htonl(INADDR_ANY)) 352 break; 353 } 354 355 rcu_read_unlock(); 356 357 len = sizeof(*kp) * c; 358 ret = 0; 359 if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen)) 360 ret = -EFAULT; 361 362 kfree(kp); 363 out: 364 return ret; 365 } 366 367 static int 368 ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg) 369 { 370 struct ip_tunnel_prl_entry *p; 371 int err = 0; 372 373 if (a->addr == htonl(INADDR_ANY)) 374 return -EINVAL; 375 376 ASSERT_RTNL(); 377 378 for (p = rtnl_dereference(t->prl); p; p = rtnl_dereference(p->next)) { 379 if (p->addr == a->addr) { 380 if (chg) { 381 p->flags = a->flags; 382 goto out; 383 } 384 err = -EEXIST; 385 goto out; 386 } 387 } 388 389 if (chg) { 390 err = -ENXIO; 391 goto out; 392 } 393 394 p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL); 395 if (!p) { 396 err = -ENOBUFS; 397 goto out; 398 } 399 400 p->next = t->prl; 401 p->addr = a->addr; 402 p->flags = a->flags; 403 t->prl_count++; 404 rcu_assign_pointer(t->prl, p); 405 out: 406 return err; 407 } 408 409 static void prl_list_destroy_rcu(struct rcu_head *head) 410 { 411 struct ip_tunnel_prl_entry *p, *n; 412 413 p = container_of(head, struct ip_tunnel_prl_entry, rcu_head); 414 do { 415 n = rcu_dereference_protected(p->next, 1); 416 kfree(p); 417 p = n; 418 } while (p); 419 } 420 421 static int 422 ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a) 423 { 424 struct ip_tunnel_prl_entry *x; 425 struct ip_tunnel_prl_entry __rcu **p; 426 int err = 0; 427 428 ASSERT_RTNL(); 429 430 if (a && a->addr != htonl(INADDR_ANY)) { 431 for (p = &t->prl; 432 (x = rtnl_dereference(*p)) != NULL; 433 p = &x->next) { 434 if (x->addr == a->addr) { 435 *p = x->next; 436 kfree_rcu(x, rcu_head); 437 t->prl_count--; 438 goto out; 439 } 440 } 441 err = -ENXIO; 442 } else { 443 x = rtnl_dereference(t->prl); 444 if (x) { 445 t->prl_count = 0; 446 call_rcu(&x->rcu_head, prl_list_destroy_rcu); 447 t->prl = NULL; 448 } 449 } 450 out: 451 return err; 452 } 453 454 static int ipip6_tunnel_prl_ctl(struct net_device *dev, 455 struct ip_tunnel_prl __user *data, int cmd) 456 { 457 struct ip_tunnel *t = netdev_priv(dev); 458 struct ip_tunnel_prl prl; 459 int err; 460 461 if (!ns_capable(t->net->user_ns, CAP_NET_ADMIN)) 462 return -EPERM; 463 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) 464 return -EINVAL; 465 466 if (copy_from_user(&prl, data, sizeof(prl))) 467 return -EFAULT; 468 469 switch (cmd) { 470 case SIOCDELPRL: 471 err = ipip6_tunnel_del_prl(t, &prl); 472 break; 473 case SIOCADDPRL: 474 case SIOCCHGPRL: 475 err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL); 476 break; 477 } 478 dst_cache_reset(&t->dst_cache); 479 netdev_state_change(dev); 480 return err; 481 } 482 483 static int 484 isatap_chksrc(struct sk_buff *skb, const struct iphdr *iph, struct ip_tunnel *t) 485 { 486 struct ip_tunnel_prl_entry *p; 487 int ok = 1; 488 489 rcu_read_lock(); 490 p = __ipip6_tunnel_locate_prl(t, iph->saddr); 491 if (p) { 492 if (p->flags & PRL_DEFAULT) 493 skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT; 494 else 495 skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT; 496 } else { 497 const struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr; 498 499 if (ipv6_addr_is_isatap(addr6) && 500 (addr6->s6_addr32[3] == iph->saddr) && 501 ipv6_chk_prefix(addr6, t->dev)) 502 skb->ndisc_nodetype = NDISC_NODETYPE_HOST; 503 else 504 ok = 0; 505 } 506 rcu_read_unlock(); 507 return ok; 508 } 509 510 static void ipip6_tunnel_uninit(struct net_device *dev) 511 { 512 struct ip_tunnel *tunnel = netdev_priv(dev); 513 struct sit_net *sitn = net_generic(tunnel->net, sit_net_id); 514 515 if (dev == sitn->fb_tunnel_dev) { 516 RCU_INIT_POINTER(sitn->tunnels_wc[0], NULL); 517 } else { 518 ipip6_tunnel_unlink(sitn, tunnel); 519 ipip6_tunnel_del_prl(tunnel, NULL); 520 } 521 dst_cache_reset(&tunnel->dst_cache); 522 dev_put_track(dev, &tunnel->dev_tracker); 523 } 524 525 static int ipip6_err(struct sk_buff *skb, u32 info) 526 { 527 const struct iphdr *iph = (const struct iphdr *)skb->data; 528 const int type = icmp_hdr(skb)->type; 529 const int code = icmp_hdr(skb)->code; 530 unsigned int data_len = 0; 531 struct ip_tunnel *t; 532 int sifindex; 533 int err; 534 535 switch (type) { 536 default: 537 case ICMP_PARAMETERPROB: 538 return 0; 539 540 case ICMP_DEST_UNREACH: 541 switch (code) { 542 case ICMP_SR_FAILED: 543 /* Impossible event. */ 544 return 0; 545 default: 546 /* All others are translated to HOST_UNREACH. 547 rfc2003 contains "deep thoughts" about NET_UNREACH, 548 I believe they are just ether pollution. --ANK 549 */ 550 break; 551 } 552 break; 553 case ICMP_TIME_EXCEEDED: 554 if (code != ICMP_EXC_TTL) 555 return 0; 556 data_len = icmp_hdr(skb)->un.reserved[1] * 4; /* RFC 4884 4.1 */ 557 break; 558 case ICMP_REDIRECT: 559 break; 560 } 561 562 err = -ENOENT; 563 564 sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0; 565 t = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, 566 iph->daddr, iph->saddr, sifindex); 567 if (!t) 568 goto out; 569 570 if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) { 571 ipv4_update_pmtu(skb, dev_net(skb->dev), info, 572 t->parms.link, iph->protocol); 573 err = 0; 574 goto out; 575 } 576 if (type == ICMP_REDIRECT) { 577 ipv4_redirect(skb, dev_net(skb->dev), t->parms.link, 578 iph->protocol); 579 err = 0; 580 goto out; 581 } 582 583 err = 0; 584 if (__in6_dev_get(skb->dev) && 585 !ip6_err_gen_icmpv6_unreach(skb, iph->ihl * 4, type, data_len)) 586 goto out; 587 588 if (t->parms.iph.daddr == 0) 589 goto out; 590 591 if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) 592 goto out; 593 594 if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) 595 t->err_count++; 596 else 597 t->err_count = 1; 598 t->err_time = jiffies; 599 out: 600 return err; 601 } 602 603 static inline bool is_spoofed_6rd(struct ip_tunnel *tunnel, const __be32 v4addr, 604 const struct in6_addr *v6addr) 605 { 606 __be32 v4embed = 0; 607 if (check_6rd(tunnel, v6addr, &v4embed) && v4addr != v4embed) 608 return true; 609 return false; 610 } 611 612 /* Checks if an address matches an address on the tunnel interface. 613 * Used to detect the NAT of proto 41 packets and let them pass spoofing test. 614 * Long story: 615 * This function is called after we considered the packet as spoofed 616 * in is_spoofed_6rd. 617 * We may have a router that is doing NAT for proto 41 packets 618 * for an internal station. Destination a.a.a.a/PREFIX:bbbb:bbbb 619 * will be translated to n.n.n.n/PREFIX:bbbb:bbbb. And is_spoofed_6rd 620 * function will return true, dropping the packet. 621 * But, we can still check if is spoofed against the IP 622 * addresses associated with the interface. 623 */ 624 static bool only_dnatted(const struct ip_tunnel *tunnel, 625 const struct in6_addr *v6dst) 626 { 627 int prefix_len; 628 629 #ifdef CONFIG_IPV6_SIT_6RD 630 prefix_len = tunnel->ip6rd.prefixlen + 32 631 - tunnel->ip6rd.relay_prefixlen; 632 #else 633 prefix_len = 48; 634 #endif 635 return ipv6_chk_custom_prefix(v6dst, prefix_len, tunnel->dev); 636 } 637 638 /* Returns true if a packet is spoofed */ 639 static bool packet_is_spoofed(struct sk_buff *skb, 640 const struct iphdr *iph, 641 struct ip_tunnel *tunnel) 642 { 643 const struct ipv6hdr *ipv6h; 644 645 if (tunnel->dev->priv_flags & IFF_ISATAP) { 646 if (!isatap_chksrc(skb, iph, tunnel)) 647 return true; 648 649 return false; 650 } 651 652 if (tunnel->dev->flags & IFF_POINTOPOINT) 653 return false; 654 655 ipv6h = ipv6_hdr(skb); 656 657 if (unlikely(is_spoofed_6rd(tunnel, iph->saddr, &ipv6h->saddr))) { 658 net_warn_ratelimited("Src spoofed %pI4/%pI6c -> %pI4/%pI6c\n", 659 &iph->saddr, &ipv6h->saddr, 660 &iph->daddr, &ipv6h->daddr); 661 return true; 662 } 663 664 if (likely(!is_spoofed_6rd(tunnel, iph->daddr, &ipv6h->daddr))) 665 return false; 666 667 if (only_dnatted(tunnel, &ipv6h->daddr)) 668 return false; 669 670 net_warn_ratelimited("Dst spoofed %pI4/%pI6c -> %pI4/%pI6c\n", 671 &iph->saddr, &ipv6h->saddr, 672 &iph->daddr, &ipv6h->daddr); 673 return true; 674 } 675 676 static int ipip6_rcv(struct sk_buff *skb) 677 { 678 const struct iphdr *iph = ip_hdr(skb); 679 struct ip_tunnel *tunnel; 680 int sifindex; 681 int err; 682 683 sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0; 684 tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, 685 iph->saddr, iph->daddr, sifindex); 686 if (tunnel) { 687 struct pcpu_sw_netstats *tstats; 688 689 if (tunnel->parms.iph.protocol != IPPROTO_IPV6 && 690 tunnel->parms.iph.protocol != 0) 691 goto out; 692 693 skb->mac_header = skb->network_header; 694 skb_reset_network_header(skb); 695 IPCB(skb)->flags = 0; 696 skb->dev = tunnel->dev; 697 698 if (packet_is_spoofed(skb, iph, tunnel)) { 699 tunnel->dev->stats.rx_errors++; 700 goto out; 701 } 702 703 if (iptunnel_pull_header(skb, 0, htons(ETH_P_IPV6), 704 !net_eq(tunnel->net, dev_net(tunnel->dev)))) 705 goto out; 706 707 /* skb can be uncloned in iptunnel_pull_header, so 708 * old iph is no longer valid 709 */ 710 iph = (const struct iphdr *)skb_mac_header(skb); 711 skb_reset_mac_header(skb); 712 713 err = IP_ECN_decapsulate(iph, skb); 714 if (unlikely(err)) { 715 if (log_ecn_error) 716 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n", 717 &iph->saddr, iph->tos); 718 if (err > 1) { 719 ++tunnel->dev->stats.rx_frame_errors; 720 ++tunnel->dev->stats.rx_errors; 721 goto out; 722 } 723 } 724 725 tstats = this_cpu_ptr(tunnel->dev->tstats); 726 u64_stats_update_begin(&tstats->syncp); 727 tstats->rx_packets++; 728 tstats->rx_bytes += skb->len; 729 u64_stats_update_end(&tstats->syncp); 730 731 netif_rx(skb); 732 733 return 0; 734 } 735 736 /* no tunnel matched, let upstream know, ipsec may handle it */ 737 return 1; 738 out: 739 kfree_skb(skb); 740 return 0; 741 } 742 743 static const struct tnl_ptk_info ipip_tpi = { 744 /* no tunnel info required for ipip. */ 745 .proto = htons(ETH_P_IP), 746 }; 747 748 #if IS_ENABLED(CONFIG_MPLS) 749 static const struct tnl_ptk_info mplsip_tpi = { 750 /* no tunnel info required for mplsip. */ 751 .proto = htons(ETH_P_MPLS_UC), 752 }; 753 #endif 754 755 static int sit_tunnel_rcv(struct sk_buff *skb, u8 ipproto) 756 { 757 const struct iphdr *iph; 758 struct ip_tunnel *tunnel; 759 int sifindex; 760 761 sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0; 762 763 iph = ip_hdr(skb); 764 tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, 765 iph->saddr, iph->daddr, sifindex); 766 if (tunnel) { 767 const struct tnl_ptk_info *tpi; 768 769 if (tunnel->parms.iph.protocol != ipproto && 770 tunnel->parms.iph.protocol != 0) 771 goto drop; 772 773 if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) 774 goto drop; 775 #if IS_ENABLED(CONFIG_MPLS) 776 if (ipproto == IPPROTO_MPLS) 777 tpi = &mplsip_tpi; 778 else 779 #endif 780 tpi = &ipip_tpi; 781 if (iptunnel_pull_header(skb, 0, tpi->proto, false)) 782 goto drop; 783 skb_reset_mac_header(skb); 784 785 return ip_tunnel_rcv(tunnel, skb, tpi, NULL, log_ecn_error); 786 } 787 788 return 1; 789 790 drop: 791 kfree_skb(skb); 792 return 0; 793 } 794 795 static int ipip_rcv(struct sk_buff *skb) 796 { 797 return sit_tunnel_rcv(skb, IPPROTO_IPIP); 798 } 799 800 #if IS_ENABLED(CONFIG_MPLS) 801 static int mplsip_rcv(struct sk_buff *skb) 802 { 803 return sit_tunnel_rcv(skb, IPPROTO_MPLS); 804 } 805 #endif 806 807 /* 808 * If the IPv6 address comes from 6rd / 6to4 (RFC 3056) addr space this function 809 * stores the embedded IPv4 address in v4dst and returns true. 810 */ 811 static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst, 812 __be32 *v4dst) 813 { 814 #ifdef CONFIG_IPV6_SIT_6RD 815 if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix, 816 tunnel->ip6rd.prefixlen)) { 817 unsigned int pbw0, pbi0; 818 int pbi1; 819 u32 d; 820 821 pbw0 = tunnel->ip6rd.prefixlen >> 5; 822 pbi0 = tunnel->ip6rd.prefixlen & 0x1f; 823 824 d = tunnel->ip6rd.relay_prefixlen < 32 ? 825 (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >> 826 tunnel->ip6rd.relay_prefixlen : 0; 827 828 pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen; 829 if (pbi1 > 0) 830 d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >> 831 (32 - pbi1); 832 833 *v4dst = tunnel->ip6rd.relay_prefix | htonl(d); 834 return true; 835 } 836 #else 837 if (v6dst->s6_addr16[0] == htons(0x2002)) { 838 /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */ 839 memcpy(v4dst, &v6dst->s6_addr16[1], 4); 840 return true; 841 } 842 #endif 843 return false; 844 } 845 846 static inline __be32 try_6rd(struct ip_tunnel *tunnel, 847 const struct in6_addr *v6dst) 848 { 849 __be32 dst = 0; 850 check_6rd(tunnel, v6dst, &dst); 851 return dst; 852 } 853 854 /* 855 * This function assumes it is being called from dev_queue_xmit() 856 * and that skb is filled properly by that function. 857 */ 858 859 static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb, 860 struct net_device *dev) 861 { 862 struct ip_tunnel *tunnel = netdev_priv(dev); 863 const struct iphdr *tiph = &tunnel->parms.iph; 864 const struct ipv6hdr *iph6 = ipv6_hdr(skb); 865 u8 tos = tunnel->parms.iph.tos; 866 __be16 df = tiph->frag_off; 867 struct rtable *rt; /* Route to the other host */ 868 struct net_device *tdev; /* Device to other host */ 869 unsigned int max_headroom; /* The extra header space needed */ 870 __be32 dst = tiph->daddr; 871 struct flowi4 fl4; 872 int mtu; 873 const struct in6_addr *addr6; 874 int addr_type; 875 u8 ttl; 876 u8 protocol = IPPROTO_IPV6; 877 int t_hlen = tunnel->hlen + sizeof(struct iphdr); 878 879 if (tos == 1) 880 tos = ipv6_get_dsfield(iph6); 881 882 /* ISATAP (RFC4214) - must come before 6to4 */ 883 if (dev->priv_flags & IFF_ISATAP) { 884 struct neighbour *neigh = NULL; 885 bool do_tx_error = false; 886 887 if (skb_dst(skb)) 888 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr); 889 890 if (!neigh) { 891 net_dbg_ratelimited("nexthop == NULL\n"); 892 goto tx_error; 893 } 894 895 addr6 = (const struct in6_addr *)&neigh->primary_key; 896 addr_type = ipv6_addr_type(addr6); 897 898 if ((addr_type & IPV6_ADDR_UNICAST) && 899 ipv6_addr_is_isatap(addr6)) 900 dst = addr6->s6_addr32[3]; 901 else 902 do_tx_error = true; 903 904 neigh_release(neigh); 905 if (do_tx_error) 906 goto tx_error; 907 } 908 909 if (!dst) 910 dst = try_6rd(tunnel, &iph6->daddr); 911 912 if (!dst) { 913 struct neighbour *neigh = NULL; 914 bool do_tx_error = false; 915 916 if (skb_dst(skb)) 917 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr); 918 919 if (!neigh) { 920 net_dbg_ratelimited("nexthop == NULL\n"); 921 goto tx_error; 922 } 923 924 addr6 = (const struct in6_addr *)&neigh->primary_key; 925 addr_type = ipv6_addr_type(addr6); 926 927 if (addr_type == IPV6_ADDR_ANY) { 928 addr6 = &ipv6_hdr(skb)->daddr; 929 addr_type = ipv6_addr_type(addr6); 930 } 931 932 if ((addr_type & IPV6_ADDR_COMPATv4) != 0) 933 dst = addr6->s6_addr32[3]; 934 else 935 do_tx_error = true; 936 937 neigh_release(neigh); 938 if (do_tx_error) 939 goto tx_error; 940 } 941 942 flowi4_init_output(&fl4, tunnel->parms.link, tunnel->fwmark, 943 RT_TOS(tos), RT_SCOPE_UNIVERSE, IPPROTO_IPV6, 944 0, dst, tiph->saddr, 0, 0, 945 sock_net_uid(tunnel->net, NULL)); 946 947 rt = dst_cache_get_ip4(&tunnel->dst_cache, &fl4.saddr); 948 if (!rt) { 949 rt = ip_route_output_flow(tunnel->net, &fl4, NULL); 950 if (IS_ERR(rt)) { 951 dev->stats.tx_carrier_errors++; 952 goto tx_error_icmp; 953 } 954 dst_cache_set_ip4(&tunnel->dst_cache, &rt->dst, fl4.saddr); 955 } 956 957 if (rt->rt_type != RTN_UNICAST && rt->rt_type != RTN_LOCAL) { 958 ip_rt_put(rt); 959 dev->stats.tx_carrier_errors++; 960 goto tx_error_icmp; 961 } 962 tdev = rt->dst.dev; 963 964 if (tdev == dev) { 965 ip_rt_put(rt); 966 dev->stats.collisions++; 967 goto tx_error; 968 } 969 970 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4)) { 971 ip_rt_put(rt); 972 goto tx_error; 973 } 974 975 if (df) { 976 mtu = dst_mtu(&rt->dst) - t_hlen; 977 978 if (mtu < IPV4_MIN_MTU) { 979 dev->stats.collisions++; 980 ip_rt_put(rt); 981 goto tx_error; 982 } 983 984 if (mtu < IPV6_MIN_MTU) { 985 mtu = IPV6_MIN_MTU; 986 df = 0; 987 } 988 989 if (tunnel->parms.iph.daddr) 990 skb_dst_update_pmtu_no_confirm(skb, mtu); 991 992 if (skb->len > mtu && !skb_is_gso(skb)) { 993 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 994 ip_rt_put(rt); 995 goto tx_error; 996 } 997 } 998 999 if (tunnel->err_count > 0) { 1000 if (time_before(jiffies, 1001 tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { 1002 tunnel->err_count--; 1003 dst_link_failure(skb); 1004 } else 1005 tunnel->err_count = 0; 1006 } 1007 1008 /* 1009 * Okay, now see if we can stuff it in the buffer as-is. 1010 */ 1011 max_headroom = LL_RESERVED_SPACE(tdev) + t_hlen; 1012 1013 if (skb_headroom(skb) < max_headroom || skb_shared(skb) || 1014 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { 1015 struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); 1016 if (!new_skb) { 1017 ip_rt_put(rt); 1018 dev->stats.tx_dropped++; 1019 kfree_skb(skb); 1020 return NETDEV_TX_OK; 1021 } 1022 if (skb->sk) 1023 skb_set_owner_w(new_skb, skb->sk); 1024 dev_kfree_skb(skb); 1025 skb = new_skb; 1026 iph6 = ipv6_hdr(skb); 1027 } 1028 ttl = tiph->ttl; 1029 if (ttl == 0) 1030 ttl = iph6->hop_limit; 1031 tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6)); 1032 1033 if (ip_tunnel_encap(skb, tunnel, &protocol, &fl4) < 0) { 1034 ip_rt_put(rt); 1035 goto tx_error; 1036 } 1037 1038 skb_set_inner_ipproto(skb, IPPROTO_IPV6); 1039 1040 iptunnel_xmit(NULL, rt, skb, fl4.saddr, fl4.daddr, protocol, tos, ttl, 1041 df, !net_eq(tunnel->net, dev_net(dev))); 1042 return NETDEV_TX_OK; 1043 1044 tx_error_icmp: 1045 dst_link_failure(skb); 1046 tx_error: 1047 kfree_skb(skb); 1048 dev->stats.tx_errors++; 1049 return NETDEV_TX_OK; 1050 } 1051 1052 static netdev_tx_t sit_tunnel_xmit__(struct sk_buff *skb, 1053 struct net_device *dev, u8 ipproto) 1054 { 1055 struct ip_tunnel *tunnel = netdev_priv(dev); 1056 const struct iphdr *tiph = &tunnel->parms.iph; 1057 1058 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4)) 1059 goto tx_error; 1060 1061 skb_set_inner_ipproto(skb, ipproto); 1062 1063 ip_tunnel_xmit(skb, dev, tiph, ipproto); 1064 return NETDEV_TX_OK; 1065 tx_error: 1066 kfree_skb(skb); 1067 dev->stats.tx_errors++; 1068 return NETDEV_TX_OK; 1069 } 1070 1071 static netdev_tx_t sit_tunnel_xmit(struct sk_buff *skb, 1072 struct net_device *dev) 1073 { 1074 if (!pskb_inet_may_pull(skb)) 1075 goto tx_err; 1076 1077 switch (skb->protocol) { 1078 case htons(ETH_P_IP): 1079 sit_tunnel_xmit__(skb, dev, IPPROTO_IPIP); 1080 break; 1081 case htons(ETH_P_IPV6): 1082 ipip6_tunnel_xmit(skb, dev); 1083 break; 1084 #if IS_ENABLED(CONFIG_MPLS) 1085 case htons(ETH_P_MPLS_UC): 1086 sit_tunnel_xmit__(skb, dev, IPPROTO_MPLS); 1087 break; 1088 #endif 1089 default: 1090 goto tx_err; 1091 } 1092 1093 return NETDEV_TX_OK; 1094 1095 tx_err: 1096 dev->stats.tx_errors++; 1097 kfree_skb(skb); 1098 return NETDEV_TX_OK; 1099 1100 } 1101 1102 static void ipip6_tunnel_bind_dev(struct net_device *dev) 1103 { 1104 struct net_device *tdev = NULL; 1105 struct ip_tunnel *tunnel; 1106 const struct iphdr *iph; 1107 struct flowi4 fl4; 1108 1109 tunnel = netdev_priv(dev); 1110 iph = &tunnel->parms.iph; 1111 1112 if (iph->daddr) { 1113 struct rtable *rt = ip_route_output_ports(tunnel->net, &fl4, 1114 NULL, 1115 iph->daddr, iph->saddr, 1116 0, 0, 1117 IPPROTO_IPV6, 1118 RT_TOS(iph->tos), 1119 tunnel->parms.link); 1120 1121 if (!IS_ERR(rt)) { 1122 tdev = rt->dst.dev; 1123 ip_rt_put(rt); 1124 } 1125 dev->flags |= IFF_POINTOPOINT; 1126 } 1127 1128 if (!tdev && tunnel->parms.link) 1129 tdev = __dev_get_by_index(tunnel->net, tunnel->parms.link); 1130 1131 if (tdev && !netif_is_l3_master(tdev)) { 1132 int t_hlen = tunnel->hlen + sizeof(struct iphdr); 1133 1134 dev->mtu = tdev->mtu - t_hlen; 1135 if (dev->mtu < IPV6_MIN_MTU) 1136 dev->mtu = IPV6_MIN_MTU; 1137 } 1138 } 1139 1140 static void ipip6_tunnel_update(struct ip_tunnel *t, struct ip_tunnel_parm *p, 1141 __u32 fwmark) 1142 { 1143 struct net *net = t->net; 1144 struct sit_net *sitn = net_generic(net, sit_net_id); 1145 1146 ipip6_tunnel_unlink(sitn, t); 1147 synchronize_net(); 1148 t->parms.iph.saddr = p->iph.saddr; 1149 t->parms.iph.daddr = p->iph.daddr; 1150 __dev_addr_set(t->dev, &p->iph.saddr, 4); 1151 memcpy(t->dev->broadcast, &p->iph.daddr, 4); 1152 ipip6_tunnel_link(sitn, t); 1153 t->parms.iph.ttl = p->iph.ttl; 1154 t->parms.iph.tos = p->iph.tos; 1155 t->parms.iph.frag_off = p->iph.frag_off; 1156 if (t->parms.link != p->link || t->fwmark != fwmark) { 1157 t->parms.link = p->link; 1158 t->fwmark = fwmark; 1159 ipip6_tunnel_bind_dev(t->dev); 1160 } 1161 dst_cache_reset(&t->dst_cache); 1162 netdev_state_change(t->dev); 1163 } 1164 1165 #ifdef CONFIG_IPV6_SIT_6RD 1166 static int ipip6_tunnel_update_6rd(struct ip_tunnel *t, 1167 struct ip_tunnel_6rd *ip6rd) 1168 { 1169 struct in6_addr prefix; 1170 __be32 relay_prefix; 1171 1172 if (ip6rd->relay_prefixlen > 32 || 1173 ip6rd->prefixlen + (32 - ip6rd->relay_prefixlen) > 64) 1174 return -EINVAL; 1175 1176 ipv6_addr_prefix(&prefix, &ip6rd->prefix, ip6rd->prefixlen); 1177 if (!ipv6_addr_equal(&prefix, &ip6rd->prefix)) 1178 return -EINVAL; 1179 if (ip6rd->relay_prefixlen) 1180 relay_prefix = ip6rd->relay_prefix & 1181 htonl(0xffffffffUL << 1182 (32 - ip6rd->relay_prefixlen)); 1183 else 1184 relay_prefix = 0; 1185 if (relay_prefix != ip6rd->relay_prefix) 1186 return -EINVAL; 1187 1188 t->ip6rd.prefix = prefix; 1189 t->ip6rd.relay_prefix = relay_prefix; 1190 t->ip6rd.prefixlen = ip6rd->prefixlen; 1191 t->ip6rd.relay_prefixlen = ip6rd->relay_prefixlen; 1192 dst_cache_reset(&t->dst_cache); 1193 netdev_state_change(t->dev); 1194 return 0; 1195 } 1196 1197 static int 1198 ipip6_tunnel_get6rd(struct net_device *dev, struct ip_tunnel_parm __user *data) 1199 { 1200 struct ip_tunnel *t = netdev_priv(dev); 1201 struct ip_tunnel_6rd ip6rd; 1202 struct ip_tunnel_parm p; 1203 1204 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) { 1205 if (copy_from_user(&p, data, sizeof(p))) 1206 return -EFAULT; 1207 t = ipip6_tunnel_locate(t->net, &p, 0); 1208 } 1209 if (!t) 1210 t = netdev_priv(dev); 1211 1212 ip6rd.prefix = t->ip6rd.prefix; 1213 ip6rd.relay_prefix = t->ip6rd.relay_prefix; 1214 ip6rd.prefixlen = t->ip6rd.prefixlen; 1215 ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen; 1216 if (copy_to_user(data, &ip6rd, sizeof(ip6rd))) 1217 return -EFAULT; 1218 return 0; 1219 } 1220 1221 static int 1222 ipip6_tunnel_6rdctl(struct net_device *dev, struct ip_tunnel_6rd __user *data, 1223 int cmd) 1224 { 1225 struct ip_tunnel *t = netdev_priv(dev); 1226 struct ip_tunnel_6rd ip6rd; 1227 int err; 1228 1229 if (!ns_capable(t->net->user_ns, CAP_NET_ADMIN)) 1230 return -EPERM; 1231 if (copy_from_user(&ip6rd, data, sizeof(ip6rd))) 1232 return -EFAULT; 1233 1234 if (cmd != SIOCDEL6RD) { 1235 err = ipip6_tunnel_update_6rd(t, &ip6rd); 1236 if (err < 0) 1237 return err; 1238 } else 1239 ipip6_tunnel_clone_6rd(dev, dev_to_sit_net(dev)); 1240 return 0; 1241 } 1242 1243 #endif /* CONFIG_IPV6_SIT_6RD */ 1244 1245 static bool ipip6_valid_ip_proto(u8 ipproto) 1246 { 1247 return ipproto == IPPROTO_IPV6 || 1248 ipproto == IPPROTO_IPIP || 1249 #if IS_ENABLED(CONFIG_MPLS) 1250 ipproto == IPPROTO_MPLS || 1251 #endif 1252 ipproto == 0; 1253 } 1254 1255 static int 1256 __ipip6_tunnel_ioctl_validate(struct net *net, struct ip_tunnel_parm *p) 1257 { 1258 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1259 return -EPERM; 1260 1261 if (!ipip6_valid_ip_proto(p->iph.protocol)) 1262 return -EINVAL; 1263 if (p->iph.version != 4 || 1264 p->iph.ihl != 5 || (p->iph.frag_off & htons(~IP_DF))) 1265 return -EINVAL; 1266 1267 if (p->iph.ttl) 1268 p->iph.frag_off |= htons(IP_DF); 1269 return 0; 1270 } 1271 1272 static int 1273 ipip6_tunnel_get(struct net_device *dev, struct ip_tunnel_parm *p) 1274 { 1275 struct ip_tunnel *t = netdev_priv(dev); 1276 1277 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) 1278 t = ipip6_tunnel_locate(t->net, p, 0); 1279 if (!t) 1280 t = netdev_priv(dev); 1281 memcpy(p, &t->parms, sizeof(*p)); 1282 return 0; 1283 } 1284 1285 static int 1286 ipip6_tunnel_add(struct net_device *dev, struct ip_tunnel_parm *p) 1287 { 1288 struct ip_tunnel *t = netdev_priv(dev); 1289 int err; 1290 1291 err = __ipip6_tunnel_ioctl_validate(t->net, p); 1292 if (err) 1293 return err; 1294 1295 t = ipip6_tunnel_locate(t->net, p, 1); 1296 if (!t) 1297 return -ENOBUFS; 1298 return 0; 1299 } 1300 1301 static int 1302 ipip6_tunnel_change(struct net_device *dev, struct ip_tunnel_parm *p) 1303 { 1304 struct ip_tunnel *t = netdev_priv(dev); 1305 int err; 1306 1307 err = __ipip6_tunnel_ioctl_validate(t->net, p); 1308 if (err) 1309 return err; 1310 1311 t = ipip6_tunnel_locate(t->net, p, 0); 1312 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) { 1313 if (!t) 1314 return -ENOENT; 1315 } else { 1316 if (t) { 1317 if (t->dev != dev) 1318 return -EEXIST; 1319 } else { 1320 if (((dev->flags & IFF_POINTOPOINT) && !p->iph.daddr) || 1321 (!(dev->flags & IFF_POINTOPOINT) && p->iph.daddr)) 1322 return -EINVAL; 1323 t = netdev_priv(dev); 1324 } 1325 1326 ipip6_tunnel_update(t, p, t->fwmark); 1327 } 1328 1329 return 0; 1330 } 1331 1332 static int 1333 ipip6_tunnel_del(struct net_device *dev, struct ip_tunnel_parm *p) 1334 { 1335 struct ip_tunnel *t = netdev_priv(dev); 1336 1337 if (!ns_capable(t->net->user_ns, CAP_NET_ADMIN)) 1338 return -EPERM; 1339 1340 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) { 1341 t = ipip6_tunnel_locate(t->net, p, 0); 1342 if (!t) 1343 return -ENOENT; 1344 if (t == netdev_priv(dev_to_sit_net(dev)->fb_tunnel_dev)) 1345 return -EPERM; 1346 dev = t->dev; 1347 } 1348 unregister_netdevice(dev); 1349 return 0; 1350 } 1351 1352 static int 1353 ipip6_tunnel_ctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd) 1354 { 1355 switch (cmd) { 1356 case SIOCGETTUNNEL: 1357 return ipip6_tunnel_get(dev, p); 1358 case SIOCADDTUNNEL: 1359 return ipip6_tunnel_add(dev, p); 1360 case SIOCCHGTUNNEL: 1361 return ipip6_tunnel_change(dev, p); 1362 case SIOCDELTUNNEL: 1363 return ipip6_tunnel_del(dev, p); 1364 default: 1365 return -EINVAL; 1366 } 1367 } 1368 1369 static int 1370 ipip6_tunnel_siocdevprivate(struct net_device *dev, struct ifreq *ifr, 1371 void __user *data, int cmd) 1372 { 1373 switch (cmd) { 1374 case SIOCGETTUNNEL: 1375 case SIOCADDTUNNEL: 1376 case SIOCCHGTUNNEL: 1377 case SIOCDELTUNNEL: 1378 return ip_tunnel_siocdevprivate(dev, ifr, data, cmd); 1379 case SIOCGETPRL: 1380 return ipip6_tunnel_get_prl(dev, data); 1381 case SIOCADDPRL: 1382 case SIOCDELPRL: 1383 case SIOCCHGPRL: 1384 return ipip6_tunnel_prl_ctl(dev, data, cmd); 1385 #ifdef CONFIG_IPV6_SIT_6RD 1386 case SIOCGET6RD: 1387 return ipip6_tunnel_get6rd(dev, data); 1388 case SIOCADD6RD: 1389 case SIOCCHG6RD: 1390 case SIOCDEL6RD: 1391 return ipip6_tunnel_6rdctl(dev, data, cmd); 1392 #endif 1393 default: 1394 return -EINVAL; 1395 } 1396 } 1397 1398 static const struct net_device_ops ipip6_netdev_ops = { 1399 .ndo_init = ipip6_tunnel_init, 1400 .ndo_uninit = ipip6_tunnel_uninit, 1401 .ndo_start_xmit = sit_tunnel_xmit, 1402 .ndo_siocdevprivate = ipip6_tunnel_siocdevprivate, 1403 .ndo_get_stats64 = dev_get_tstats64, 1404 .ndo_get_iflink = ip_tunnel_get_iflink, 1405 .ndo_tunnel_ctl = ipip6_tunnel_ctl, 1406 }; 1407 1408 static void ipip6_dev_free(struct net_device *dev) 1409 { 1410 struct ip_tunnel *tunnel = netdev_priv(dev); 1411 1412 dst_cache_destroy(&tunnel->dst_cache); 1413 free_percpu(dev->tstats); 1414 } 1415 1416 #define SIT_FEATURES (NETIF_F_SG | \ 1417 NETIF_F_FRAGLIST | \ 1418 NETIF_F_HIGHDMA | \ 1419 NETIF_F_GSO_SOFTWARE | \ 1420 NETIF_F_HW_CSUM) 1421 1422 static void ipip6_tunnel_setup(struct net_device *dev) 1423 { 1424 struct ip_tunnel *tunnel = netdev_priv(dev); 1425 int t_hlen = tunnel->hlen + sizeof(struct iphdr); 1426 1427 dev->netdev_ops = &ipip6_netdev_ops; 1428 dev->header_ops = &ip_tunnel_header_ops; 1429 dev->needs_free_netdev = true; 1430 dev->priv_destructor = ipip6_dev_free; 1431 1432 dev->type = ARPHRD_SIT; 1433 dev->mtu = ETH_DATA_LEN - t_hlen; 1434 dev->min_mtu = IPV6_MIN_MTU; 1435 dev->max_mtu = IP6_MAX_MTU - t_hlen; 1436 dev->flags = IFF_NOARP; 1437 netif_keep_dst(dev); 1438 dev->addr_len = 4; 1439 dev->features |= NETIF_F_LLTX; 1440 dev->features |= SIT_FEATURES; 1441 dev->hw_features |= SIT_FEATURES; 1442 } 1443 1444 static int ipip6_tunnel_init(struct net_device *dev) 1445 { 1446 struct ip_tunnel *tunnel = netdev_priv(dev); 1447 int err; 1448 1449 tunnel->dev = dev; 1450 tunnel->net = dev_net(dev); 1451 strcpy(tunnel->parms.name, dev->name); 1452 1453 ipip6_tunnel_bind_dev(dev); 1454 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 1455 if (!dev->tstats) 1456 return -ENOMEM; 1457 1458 err = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); 1459 if (err) { 1460 free_percpu(dev->tstats); 1461 dev->tstats = NULL; 1462 return err; 1463 } 1464 dev_hold_track(dev, &tunnel->dev_tracker, GFP_KERNEL); 1465 return 0; 1466 } 1467 1468 static void __net_init ipip6_fb_tunnel_init(struct net_device *dev) 1469 { 1470 struct ip_tunnel *tunnel = netdev_priv(dev); 1471 struct iphdr *iph = &tunnel->parms.iph; 1472 struct net *net = dev_net(dev); 1473 struct sit_net *sitn = net_generic(net, sit_net_id); 1474 1475 iph->version = 4; 1476 iph->protocol = IPPROTO_IPV6; 1477 iph->ihl = 5; 1478 iph->ttl = 64; 1479 1480 rcu_assign_pointer(sitn->tunnels_wc[0], tunnel); 1481 } 1482 1483 static int ipip6_validate(struct nlattr *tb[], struct nlattr *data[], 1484 struct netlink_ext_ack *extack) 1485 { 1486 u8 proto; 1487 1488 if (!data || !data[IFLA_IPTUN_PROTO]) 1489 return 0; 1490 1491 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); 1492 if (!ipip6_valid_ip_proto(proto)) 1493 return -EINVAL; 1494 1495 return 0; 1496 } 1497 1498 static void ipip6_netlink_parms(struct nlattr *data[], 1499 struct ip_tunnel_parm *parms, 1500 __u32 *fwmark) 1501 { 1502 memset(parms, 0, sizeof(*parms)); 1503 1504 parms->iph.version = 4; 1505 parms->iph.protocol = IPPROTO_IPV6; 1506 parms->iph.ihl = 5; 1507 parms->iph.ttl = 64; 1508 1509 if (!data) 1510 return; 1511 1512 if (data[IFLA_IPTUN_LINK]) 1513 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]); 1514 1515 if (data[IFLA_IPTUN_LOCAL]) 1516 parms->iph.saddr = nla_get_be32(data[IFLA_IPTUN_LOCAL]); 1517 1518 if (data[IFLA_IPTUN_REMOTE]) 1519 parms->iph.daddr = nla_get_be32(data[IFLA_IPTUN_REMOTE]); 1520 1521 if (data[IFLA_IPTUN_TTL]) { 1522 parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]); 1523 if (parms->iph.ttl) 1524 parms->iph.frag_off = htons(IP_DF); 1525 } 1526 1527 if (data[IFLA_IPTUN_TOS]) 1528 parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]); 1529 1530 if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC])) 1531 parms->iph.frag_off = htons(IP_DF); 1532 1533 if (data[IFLA_IPTUN_FLAGS]) 1534 parms->i_flags = nla_get_be16(data[IFLA_IPTUN_FLAGS]); 1535 1536 if (data[IFLA_IPTUN_PROTO]) 1537 parms->iph.protocol = nla_get_u8(data[IFLA_IPTUN_PROTO]); 1538 1539 if (data[IFLA_IPTUN_FWMARK]) 1540 *fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]); 1541 } 1542 1543 /* This function returns true when ENCAP attributes are present in the nl msg */ 1544 static bool ipip6_netlink_encap_parms(struct nlattr *data[], 1545 struct ip_tunnel_encap *ipencap) 1546 { 1547 bool ret = false; 1548 1549 memset(ipencap, 0, sizeof(*ipencap)); 1550 1551 if (!data) 1552 return ret; 1553 1554 if (data[IFLA_IPTUN_ENCAP_TYPE]) { 1555 ret = true; 1556 ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]); 1557 } 1558 1559 if (data[IFLA_IPTUN_ENCAP_FLAGS]) { 1560 ret = true; 1561 ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]); 1562 } 1563 1564 if (data[IFLA_IPTUN_ENCAP_SPORT]) { 1565 ret = true; 1566 ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]); 1567 } 1568 1569 if (data[IFLA_IPTUN_ENCAP_DPORT]) { 1570 ret = true; 1571 ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]); 1572 } 1573 1574 return ret; 1575 } 1576 1577 #ifdef CONFIG_IPV6_SIT_6RD 1578 /* This function returns true when 6RD attributes are present in the nl msg */ 1579 static bool ipip6_netlink_6rd_parms(struct nlattr *data[], 1580 struct ip_tunnel_6rd *ip6rd) 1581 { 1582 bool ret = false; 1583 memset(ip6rd, 0, sizeof(*ip6rd)); 1584 1585 if (!data) 1586 return ret; 1587 1588 if (data[IFLA_IPTUN_6RD_PREFIX]) { 1589 ret = true; 1590 ip6rd->prefix = nla_get_in6_addr(data[IFLA_IPTUN_6RD_PREFIX]); 1591 } 1592 1593 if (data[IFLA_IPTUN_6RD_RELAY_PREFIX]) { 1594 ret = true; 1595 ip6rd->relay_prefix = 1596 nla_get_be32(data[IFLA_IPTUN_6RD_RELAY_PREFIX]); 1597 } 1598 1599 if (data[IFLA_IPTUN_6RD_PREFIXLEN]) { 1600 ret = true; 1601 ip6rd->prefixlen = nla_get_u16(data[IFLA_IPTUN_6RD_PREFIXLEN]); 1602 } 1603 1604 if (data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]) { 1605 ret = true; 1606 ip6rd->relay_prefixlen = 1607 nla_get_u16(data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]); 1608 } 1609 1610 return ret; 1611 } 1612 #endif 1613 1614 static int ipip6_newlink(struct net *src_net, struct net_device *dev, 1615 struct nlattr *tb[], struct nlattr *data[], 1616 struct netlink_ext_ack *extack) 1617 { 1618 struct net *net = dev_net(dev); 1619 struct ip_tunnel *nt; 1620 struct ip_tunnel_encap ipencap; 1621 #ifdef CONFIG_IPV6_SIT_6RD 1622 struct ip_tunnel_6rd ip6rd; 1623 #endif 1624 int err; 1625 1626 nt = netdev_priv(dev); 1627 1628 if (ipip6_netlink_encap_parms(data, &ipencap)) { 1629 err = ip_tunnel_encap_setup(nt, &ipencap); 1630 if (err < 0) 1631 return err; 1632 } 1633 1634 ipip6_netlink_parms(data, &nt->parms, &nt->fwmark); 1635 1636 if (ipip6_tunnel_locate(net, &nt->parms, 0)) 1637 return -EEXIST; 1638 1639 err = ipip6_tunnel_create(dev); 1640 if (err < 0) 1641 return err; 1642 1643 if (tb[IFLA_MTU]) { 1644 u32 mtu = nla_get_u32(tb[IFLA_MTU]); 1645 1646 if (mtu >= IPV6_MIN_MTU && 1647 mtu <= IP6_MAX_MTU - dev->hard_header_len) 1648 dev->mtu = mtu; 1649 } 1650 1651 #ifdef CONFIG_IPV6_SIT_6RD 1652 if (ipip6_netlink_6rd_parms(data, &ip6rd)) { 1653 err = ipip6_tunnel_update_6rd(nt, &ip6rd); 1654 if (err < 0) 1655 unregister_netdevice_queue(dev, NULL); 1656 } 1657 #endif 1658 1659 return err; 1660 } 1661 1662 static int ipip6_changelink(struct net_device *dev, struct nlattr *tb[], 1663 struct nlattr *data[], 1664 struct netlink_ext_ack *extack) 1665 { 1666 struct ip_tunnel *t = netdev_priv(dev); 1667 struct ip_tunnel_parm p; 1668 struct ip_tunnel_encap ipencap; 1669 struct net *net = t->net; 1670 struct sit_net *sitn = net_generic(net, sit_net_id); 1671 #ifdef CONFIG_IPV6_SIT_6RD 1672 struct ip_tunnel_6rd ip6rd; 1673 #endif 1674 __u32 fwmark = t->fwmark; 1675 int err; 1676 1677 if (dev == sitn->fb_tunnel_dev) 1678 return -EINVAL; 1679 1680 if (ipip6_netlink_encap_parms(data, &ipencap)) { 1681 err = ip_tunnel_encap_setup(t, &ipencap); 1682 if (err < 0) 1683 return err; 1684 } 1685 1686 ipip6_netlink_parms(data, &p, &fwmark); 1687 1688 if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) || 1689 (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr)) 1690 return -EINVAL; 1691 1692 t = ipip6_tunnel_locate(net, &p, 0); 1693 1694 if (t) { 1695 if (t->dev != dev) 1696 return -EEXIST; 1697 } else 1698 t = netdev_priv(dev); 1699 1700 ipip6_tunnel_update(t, &p, fwmark); 1701 1702 #ifdef CONFIG_IPV6_SIT_6RD 1703 if (ipip6_netlink_6rd_parms(data, &ip6rd)) 1704 return ipip6_tunnel_update_6rd(t, &ip6rd); 1705 #endif 1706 1707 return 0; 1708 } 1709 1710 static size_t ipip6_get_size(const struct net_device *dev) 1711 { 1712 return 1713 /* IFLA_IPTUN_LINK */ 1714 nla_total_size(4) + 1715 /* IFLA_IPTUN_LOCAL */ 1716 nla_total_size(4) + 1717 /* IFLA_IPTUN_REMOTE */ 1718 nla_total_size(4) + 1719 /* IFLA_IPTUN_TTL */ 1720 nla_total_size(1) + 1721 /* IFLA_IPTUN_TOS */ 1722 nla_total_size(1) + 1723 /* IFLA_IPTUN_PMTUDISC */ 1724 nla_total_size(1) + 1725 /* IFLA_IPTUN_FLAGS */ 1726 nla_total_size(2) + 1727 /* IFLA_IPTUN_PROTO */ 1728 nla_total_size(1) + 1729 #ifdef CONFIG_IPV6_SIT_6RD 1730 /* IFLA_IPTUN_6RD_PREFIX */ 1731 nla_total_size(sizeof(struct in6_addr)) + 1732 /* IFLA_IPTUN_6RD_RELAY_PREFIX */ 1733 nla_total_size(4) + 1734 /* IFLA_IPTUN_6RD_PREFIXLEN */ 1735 nla_total_size(2) + 1736 /* IFLA_IPTUN_6RD_RELAY_PREFIXLEN */ 1737 nla_total_size(2) + 1738 #endif 1739 /* IFLA_IPTUN_ENCAP_TYPE */ 1740 nla_total_size(2) + 1741 /* IFLA_IPTUN_ENCAP_FLAGS */ 1742 nla_total_size(2) + 1743 /* IFLA_IPTUN_ENCAP_SPORT */ 1744 nla_total_size(2) + 1745 /* IFLA_IPTUN_ENCAP_DPORT */ 1746 nla_total_size(2) + 1747 /* IFLA_IPTUN_FWMARK */ 1748 nla_total_size(4) + 1749 0; 1750 } 1751 1752 static int ipip6_fill_info(struct sk_buff *skb, const struct net_device *dev) 1753 { 1754 struct ip_tunnel *tunnel = netdev_priv(dev); 1755 struct ip_tunnel_parm *parm = &tunnel->parms; 1756 1757 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || 1758 nla_put_in_addr(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) || 1759 nla_put_in_addr(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) || 1760 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) || 1761 nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) || 1762 nla_put_u8(skb, IFLA_IPTUN_PMTUDISC, 1763 !!(parm->iph.frag_off & htons(IP_DF))) || 1764 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->iph.protocol) || 1765 nla_put_be16(skb, IFLA_IPTUN_FLAGS, parm->i_flags) || 1766 nla_put_u32(skb, IFLA_IPTUN_FWMARK, tunnel->fwmark)) 1767 goto nla_put_failure; 1768 1769 #ifdef CONFIG_IPV6_SIT_6RD 1770 if (nla_put_in6_addr(skb, IFLA_IPTUN_6RD_PREFIX, 1771 &tunnel->ip6rd.prefix) || 1772 nla_put_in_addr(skb, IFLA_IPTUN_6RD_RELAY_PREFIX, 1773 tunnel->ip6rd.relay_prefix) || 1774 nla_put_u16(skb, IFLA_IPTUN_6RD_PREFIXLEN, 1775 tunnel->ip6rd.prefixlen) || 1776 nla_put_u16(skb, IFLA_IPTUN_6RD_RELAY_PREFIXLEN, 1777 tunnel->ip6rd.relay_prefixlen)) 1778 goto nla_put_failure; 1779 #endif 1780 1781 if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE, 1782 tunnel->encap.type) || 1783 nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT, 1784 tunnel->encap.sport) || 1785 nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT, 1786 tunnel->encap.dport) || 1787 nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS, 1788 tunnel->encap.flags)) 1789 goto nla_put_failure; 1790 1791 return 0; 1792 1793 nla_put_failure: 1794 return -EMSGSIZE; 1795 } 1796 1797 static const struct nla_policy ipip6_policy[IFLA_IPTUN_MAX + 1] = { 1798 [IFLA_IPTUN_LINK] = { .type = NLA_U32 }, 1799 [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 }, 1800 [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 }, 1801 [IFLA_IPTUN_TTL] = { .type = NLA_U8 }, 1802 [IFLA_IPTUN_TOS] = { .type = NLA_U8 }, 1803 [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 }, 1804 [IFLA_IPTUN_FLAGS] = { .type = NLA_U16 }, 1805 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 }, 1806 #ifdef CONFIG_IPV6_SIT_6RD 1807 [IFLA_IPTUN_6RD_PREFIX] = { .len = sizeof(struct in6_addr) }, 1808 [IFLA_IPTUN_6RD_RELAY_PREFIX] = { .type = NLA_U32 }, 1809 [IFLA_IPTUN_6RD_PREFIXLEN] = { .type = NLA_U16 }, 1810 [IFLA_IPTUN_6RD_RELAY_PREFIXLEN] = { .type = NLA_U16 }, 1811 #endif 1812 [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 }, 1813 [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 }, 1814 [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 }, 1815 [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 }, 1816 [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 }, 1817 }; 1818 1819 static void ipip6_dellink(struct net_device *dev, struct list_head *head) 1820 { 1821 struct net *net = dev_net(dev); 1822 struct sit_net *sitn = net_generic(net, sit_net_id); 1823 1824 if (dev != sitn->fb_tunnel_dev) 1825 unregister_netdevice_queue(dev, head); 1826 } 1827 1828 static struct rtnl_link_ops sit_link_ops __read_mostly = { 1829 .kind = "sit", 1830 .maxtype = IFLA_IPTUN_MAX, 1831 .policy = ipip6_policy, 1832 .priv_size = sizeof(struct ip_tunnel), 1833 .setup = ipip6_tunnel_setup, 1834 .validate = ipip6_validate, 1835 .newlink = ipip6_newlink, 1836 .changelink = ipip6_changelink, 1837 .get_size = ipip6_get_size, 1838 .fill_info = ipip6_fill_info, 1839 .dellink = ipip6_dellink, 1840 .get_link_net = ip_tunnel_get_link_net, 1841 }; 1842 1843 static struct xfrm_tunnel sit_handler __read_mostly = { 1844 .handler = ipip6_rcv, 1845 .err_handler = ipip6_err, 1846 .priority = 1, 1847 }; 1848 1849 static struct xfrm_tunnel ipip_handler __read_mostly = { 1850 .handler = ipip_rcv, 1851 .err_handler = ipip6_err, 1852 .priority = 2, 1853 }; 1854 1855 #if IS_ENABLED(CONFIG_MPLS) 1856 static struct xfrm_tunnel mplsip_handler __read_mostly = { 1857 .handler = mplsip_rcv, 1858 .err_handler = ipip6_err, 1859 .priority = 2, 1860 }; 1861 #endif 1862 1863 static void __net_exit sit_destroy_tunnels(struct net *net, 1864 struct list_head *head) 1865 { 1866 struct sit_net *sitn = net_generic(net, sit_net_id); 1867 struct net_device *dev, *aux; 1868 int prio; 1869 1870 for_each_netdev_safe(net, dev, aux) 1871 if (dev->rtnl_link_ops == &sit_link_ops) 1872 unregister_netdevice_queue(dev, head); 1873 1874 for (prio = 0; prio < 4; prio++) { 1875 int h; 1876 for (h = 0; h < (prio ? IP6_SIT_HASH_SIZE : 1); h++) { 1877 struct ip_tunnel *t; 1878 1879 t = rtnl_dereference(sitn->tunnels[prio][h]); 1880 while (t) { 1881 /* If dev is in the same netns, it has already 1882 * been added to the list by the previous loop. 1883 */ 1884 if (!net_eq(dev_net(t->dev), net)) 1885 unregister_netdevice_queue(t->dev, 1886 head); 1887 t = rtnl_dereference(t->next); 1888 } 1889 } 1890 } 1891 } 1892 1893 static int __net_init sit_init_net(struct net *net) 1894 { 1895 struct sit_net *sitn = net_generic(net, sit_net_id); 1896 struct ip_tunnel *t; 1897 int err; 1898 1899 sitn->tunnels[0] = sitn->tunnels_wc; 1900 sitn->tunnels[1] = sitn->tunnels_l; 1901 sitn->tunnels[2] = sitn->tunnels_r; 1902 sitn->tunnels[3] = sitn->tunnels_r_l; 1903 1904 if (!net_has_fallback_tunnels(net)) 1905 return 0; 1906 1907 sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0", 1908 NET_NAME_UNKNOWN, 1909 ipip6_tunnel_setup); 1910 if (!sitn->fb_tunnel_dev) { 1911 err = -ENOMEM; 1912 goto err_alloc_dev; 1913 } 1914 dev_net_set(sitn->fb_tunnel_dev, net); 1915 sitn->fb_tunnel_dev->rtnl_link_ops = &sit_link_ops; 1916 /* FB netdevice is special: we have one, and only one per netns. 1917 * Allowing to move it to another netns is clearly unsafe. 1918 */ 1919 sitn->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL; 1920 1921 err = register_netdev(sitn->fb_tunnel_dev); 1922 if (err) 1923 goto err_reg_dev; 1924 1925 ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn); 1926 ipip6_fb_tunnel_init(sitn->fb_tunnel_dev); 1927 1928 t = netdev_priv(sitn->fb_tunnel_dev); 1929 1930 strcpy(t->parms.name, sitn->fb_tunnel_dev->name); 1931 return 0; 1932 1933 err_reg_dev: 1934 free_netdev(sitn->fb_tunnel_dev); 1935 err_alloc_dev: 1936 return err; 1937 } 1938 1939 static void __net_exit sit_exit_batch_net(struct list_head *net_list) 1940 { 1941 LIST_HEAD(list); 1942 struct net *net; 1943 1944 rtnl_lock(); 1945 list_for_each_entry(net, net_list, exit_list) 1946 sit_destroy_tunnels(net, &list); 1947 1948 unregister_netdevice_many(&list); 1949 rtnl_unlock(); 1950 } 1951 1952 static struct pernet_operations sit_net_ops = { 1953 .init = sit_init_net, 1954 .exit_batch = sit_exit_batch_net, 1955 .id = &sit_net_id, 1956 .size = sizeof(struct sit_net), 1957 }; 1958 1959 static void __exit sit_cleanup(void) 1960 { 1961 rtnl_link_unregister(&sit_link_ops); 1962 xfrm4_tunnel_deregister(&sit_handler, AF_INET6); 1963 xfrm4_tunnel_deregister(&ipip_handler, AF_INET); 1964 #if IS_ENABLED(CONFIG_MPLS) 1965 xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS); 1966 #endif 1967 1968 unregister_pernet_device(&sit_net_ops); 1969 rcu_barrier(); /* Wait for completion of call_rcu()'s */ 1970 } 1971 1972 static int __init sit_init(void) 1973 { 1974 int err; 1975 1976 pr_info("IPv6, IPv4 and MPLS over IPv4 tunneling driver\n"); 1977 1978 err = register_pernet_device(&sit_net_ops); 1979 if (err < 0) 1980 return err; 1981 err = xfrm4_tunnel_register(&sit_handler, AF_INET6); 1982 if (err < 0) { 1983 pr_info("%s: can't register ip6ip4\n", __func__); 1984 goto xfrm_tunnel_failed; 1985 } 1986 err = xfrm4_tunnel_register(&ipip_handler, AF_INET); 1987 if (err < 0) { 1988 pr_info("%s: can't register ip4ip4\n", __func__); 1989 goto xfrm_tunnel4_failed; 1990 } 1991 #if IS_ENABLED(CONFIG_MPLS) 1992 err = xfrm4_tunnel_register(&mplsip_handler, AF_MPLS); 1993 if (err < 0) { 1994 pr_info("%s: can't register mplsip\n", __func__); 1995 goto xfrm_tunnel_mpls_failed; 1996 } 1997 #endif 1998 err = rtnl_link_register(&sit_link_ops); 1999 if (err < 0) 2000 goto rtnl_link_failed; 2001 2002 out: 2003 return err; 2004 2005 rtnl_link_failed: 2006 #if IS_ENABLED(CONFIG_MPLS) 2007 xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS); 2008 xfrm_tunnel_mpls_failed: 2009 #endif 2010 xfrm4_tunnel_deregister(&ipip_handler, AF_INET); 2011 xfrm_tunnel4_failed: 2012 xfrm4_tunnel_deregister(&sit_handler, AF_INET6); 2013 xfrm_tunnel_failed: 2014 unregister_pernet_device(&sit_net_ops); 2015 goto out; 2016 } 2017 2018 module_init(sit_init); 2019 module_exit(sit_cleanup); 2020 MODULE_LICENSE("GPL"); 2021 MODULE_ALIAS_RTNL_LINK("sit"); 2022 MODULE_ALIAS_NETDEV("sit0"); 2023