1 /* 2 * IPv6 virtual tunneling interface 3 * 4 * Copyright (C) 2013 secunet Security Networks AG 5 * 6 * Author: 7 * Steffen Klassert <steffen.klassert@secunet.com> 8 * 9 * Based on: 10 * net/ipv6/ip6_tunnel.c 11 * 12 * This program is free software; you can redistribute it and/or 13 * modify it under the terms of the GNU General Public License 14 * as published by the Free Software Foundation; either version 15 * 2 of the License, or (at your option) any later version. 16 */ 17 18 #include <linux/module.h> 19 #include <linux/capability.h> 20 #include <linux/errno.h> 21 #include <linux/types.h> 22 #include <linux/sockios.h> 23 #include <linux/icmp.h> 24 #include <linux/if.h> 25 #include <linux/in.h> 26 #include <linux/ip.h> 27 #include <linux/net.h> 28 #include <linux/in6.h> 29 #include <linux/netdevice.h> 30 #include <linux/if_arp.h> 31 #include <linux/icmpv6.h> 32 #include <linux/init.h> 33 #include <linux/route.h> 34 #include <linux/rtnetlink.h> 35 #include <linux/netfilter_ipv6.h> 36 #include <linux/slab.h> 37 #include <linux/hash.h> 38 39 #include <linux/uaccess.h> 40 #include <linux/atomic.h> 41 42 #include <net/icmp.h> 43 #include <net/ip.h> 44 #include <net/ip_tunnels.h> 45 #include <net/ipv6.h> 46 #include <net/ip6_route.h> 47 #include <net/addrconf.h> 48 #include <net/ip6_tunnel.h> 49 #include <net/xfrm.h> 50 #include <net/net_namespace.h> 51 #include <net/netns/generic.h> 52 53 #define HASH_SIZE_SHIFT 5 54 #define HASH_SIZE (1 << HASH_SIZE_SHIFT) 55 56 static u32 HASH(const struct in6_addr *addr1, const struct in6_addr *addr2) 57 { 58 u32 hash = ipv6_addr_hash(addr1) ^ ipv6_addr_hash(addr2); 59 60 return hash_32(hash, HASH_SIZE_SHIFT); 61 } 62 63 static int vti6_dev_init(struct net_device *dev); 64 static void vti6_dev_setup(struct net_device *dev); 65 static struct rtnl_link_ops vti6_link_ops __read_mostly; 66 67 static int vti6_net_id __read_mostly; 68 struct vti6_net { 69 /* the vti6 tunnel fallback device */ 70 struct net_device *fb_tnl_dev; 71 /* lists for storing tunnels in use */ 72 struct ip6_tnl __rcu *tnls_r_l[HASH_SIZE]; 73 struct ip6_tnl __rcu *tnls_wc[1]; 74 struct ip6_tnl __rcu **tnls[2]; 75 }; 76 77 #define for_each_vti6_tunnel_rcu(start) \ 78 for (t = rcu_dereference(start); t; t = rcu_dereference(t->next)) 79 80 /** 81 * vti6_tnl_lookup - fetch tunnel matching the end-point addresses 82 * @net: network namespace 83 * @remote: the address of the tunnel exit-point 84 * @local: the address of the tunnel entry-point 85 * 86 * Return: 87 * tunnel matching given end-points if found, 88 * else fallback tunnel if its device is up, 89 * else %NULL 90 **/ 91 static struct ip6_tnl * 92 vti6_tnl_lookup(struct net *net, const struct in6_addr *remote, 93 const struct in6_addr *local) 94 { 95 unsigned int hash = HASH(remote, local); 96 struct ip6_tnl *t; 97 struct vti6_net *ip6n = net_generic(net, vti6_net_id); 98 99 for_each_vti6_tunnel_rcu(ip6n->tnls_r_l[hash]) { 100 if (ipv6_addr_equal(local, &t->parms.laddr) && 101 ipv6_addr_equal(remote, &t->parms.raddr) && 102 (t->dev->flags & IFF_UP)) 103 return t; 104 } 105 t = rcu_dereference(ip6n->tnls_wc[0]); 106 if (t && (t->dev->flags & IFF_UP)) 107 return t; 108 109 return NULL; 110 } 111 112 /** 113 * vti6_tnl_bucket - get head of list matching given tunnel parameters 114 * @p: parameters containing tunnel end-points 115 * 116 * Description: 117 * vti6_tnl_bucket() returns the head of the list matching the 118 * &struct in6_addr entries laddr and raddr in @p. 119 * 120 * Return: head of IPv6 tunnel list 121 **/ 122 static struct ip6_tnl __rcu ** 123 vti6_tnl_bucket(struct vti6_net *ip6n, const struct __ip6_tnl_parm *p) 124 { 125 const struct in6_addr *remote = &p->raddr; 126 const struct in6_addr *local = &p->laddr; 127 unsigned int h = 0; 128 int prio = 0; 129 130 if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) { 131 prio = 1; 132 h = HASH(remote, local); 133 } 134 return &ip6n->tnls[prio][h]; 135 } 136 137 static void 138 vti6_tnl_link(struct vti6_net *ip6n, struct ip6_tnl *t) 139 { 140 struct ip6_tnl __rcu **tp = vti6_tnl_bucket(ip6n, &t->parms); 141 142 rcu_assign_pointer(t->next , rtnl_dereference(*tp)); 143 rcu_assign_pointer(*tp, t); 144 } 145 146 static void 147 vti6_tnl_unlink(struct vti6_net *ip6n, struct ip6_tnl *t) 148 { 149 struct ip6_tnl __rcu **tp; 150 struct ip6_tnl *iter; 151 152 for (tp = vti6_tnl_bucket(ip6n, &t->parms); 153 (iter = rtnl_dereference(*tp)) != NULL; 154 tp = &iter->next) { 155 if (t == iter) { 156 rcu_assign_pointer(*tp, t->next); 157 break; 158 } 159 } 160 } 161 162 static void vti6_dev_free(struct net_device *dev) 163 { 164 free_percpu(dev->tstats); 165 free_netdev(dev); 166 } 167 168 static int vti6_tnl_create2(struct net_device *dev) 169 { 170 struct ip6_tnl *t = netdev_priv(dev); 171 struct net *net = dev_net(dev); 172 struct vti6_net *ip6n = net_generic(net, vti6_net_id); 173 int err; 174 175 err = vti6_dev_init(dev); 176 if (err < 0) 177 goto out; 178 179 err = register_netdevice(dev); 180 if (err < 0) 181 goto out; 182 183 strcpy(t->parms.name, dev->name); 184 dev->rtnl_link_ops = &vti6_link_ops; 185 186 dev_hold(dev); 187 vti6_tnl_link(ip6n, t); 188 189 return 0; 190 191 out: 192 return err; 193 } 194 195 static struct ip6_tnl *vti6_tnl_create(struct net *net, struct __ip6_tnl_parm *p) 196 { 197 struct net_device *dev; 198 struct ip6_tnl *t; 199 char name[IFNAMSIZ]; 200 int err; 201 202 if (p->name[0]) 203 strlcpy(name, p->name, IFNAMSIZ); 204 else 205 sprintf(name, "ip6_vti%%d"); 206 207 dev = alloc_netdev(sizeof(*t), name, vti6_dev_setup); 208 if (dev == NULL) 209 goto failed; 210 211 dev_net_set(dev, net); 212 213 t = netdev_priv(dev); 214 t->parms = *p; 215 t->net = dev_net(dev); 216 217 err = vti6_tnl_create2(dev); 218 if (err < 0) 219 goto failed_free; 220 221 return t; 222 223 failed_free: 224 vti6_dev_free(dev); 225 failed: 226 return NULL; 227 } 228 229 /** 230 * vti6_locate - find or create tunnel matching given parameters 231 * @net: network namespace 232 * @p: tunnel parameters 233 * @create: != 0 if allowed to create new tunnel if no match found 234 * 235 * Description: 236 * vti6_locate() first tries to locate an existing tunnel 237 * based on @parms. If this is unsuccessful, but @create is set a new 238 * tunnel device is created and registered for use. 239 * 240 * Return: 241 * matching tunnel or NULL 242 **/ 243 static struct ip6_tnl *vti6_locate(struct net *net, struct __ip6_tnl_parm *p, 244 int create) 245 { 246 const struct in6_addr *remote = &p->raddr; 247 const struct in6_addr *local = &p->laddr; 248 struct ip6_tnl __rcu **tp; 249 struct ip6_tnl *t; 250 struct vti6_net *ip6n = net_generic(net, vti6_net_id); 251 252 for (tp = vti6_tnl_bucket(ip6n, p); 253 (t = rtnl_dereference(*tp)) != NULL; 254 tp = &t->next) { 255 if (ipv6_addr_equal(local, &t->parms.laddr) && 256 ipv6_addr_equal(remote, &t->parms.raddr)) 257 return t; 258 } 259 if (!create) 260 return NULL; 261 return vti6_tnl_create(net, p); 262 } 263 264 /** 265 * vti6_dev_uninit - tunnel device uninitializer 266 * @dev: the device to be destroyed 267 * 268 * Description: 269 * vti6_dev_uninit() removes tunnel from its list 270 **/ 271 static void vti6_dev_uninit(struct net_device *dev) 272 { 273 struct ip6_tnl *t = netdev_priv(dev); 274 struct net *net = dev_net(dev); 275 struct vti6_net *ip6n = net_generic(net, vti6_net_id); 276 277 if (dev == ip6n->fb_tnl_dev) 278 RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL); 279 else 280 vti6_tnl_unlink(ip6n, t); 281 ip6_tnl_dst_reset(t); 282 dev_put(dev); 283 } 284 285 static int vti6_rcv(struct sk_buff *skb) 286 { 287 struct ip6_tnl *t; 288 const struct ipv6hdr *ipv6h = ipv6_hdr(skb); 289 290 rcu_read_lock(); 291 292 if ((t = vti6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, 293 &ipv6h->daddr)) != NULL) { 294 struct pcpu_sw_netstats *tstats; 295 296 if (t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) { 297 rcu_read_unlock(); 298 goto discard; 299 } 300 301 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { 302 rcu_read_unlock(); 303 return 0; 304 } 305 306 if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) { 307 t->dev->stats.rx_dropped++; 308 rcu_read_unlock(); 309 goto discard; 310 } 311 312 tstats = this_cpu_ptr(t->dev->tstats); 313 u64_stats_update_begin(&tstats->syncp); 314 tstats->rx_packets++; 315 tstats->rx_bytes += skb->len; 316 u64_stats_update_end(&tstats->syncp); 317 318 skb->mark = 0; 319 secpath_reset(skb); 320 skb->dev = t->dev; 321 322 rcu_read_unlock(); 323 return 0; 324 } 325 rcu_read_unlock(); 326 return 1; 327 328 discard: 329 kfree_skb(skb); 330 return 0; 331 } 332 333 /** 334 * vti6_addr_conflict - compare packet addresses to tunnel's own 335 * @t: the outgoing tunnel device 336 * @hdr: IPv6 header from the incoming packet 337 * 338 * Description: 339 * Avoid trivial tunneling loop by checking that tunnel exit-point 340 * doesn't match source of incoming packet. 341 * 342 * Return: 343 * 1 if conflict, 344 * 0 else 345 **/ 346 static inline bool 347 vti6_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr) 348 { 349 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); 350 } 351 352 /** 353 * vti6_xmit - send a packet 354 * @skb: the outgoing socket buffer 355 * @dev: the outgoing tunnel device 356 **/ 357 static int vti6_xmit(struct sk_buff *skb, struct net_device *dev) 358 { 359 struct net *net = dev_net(dev); 360 struct ip6_tnl *t = netdev_priv(dev); 361 struct net_device_stats *stats = &t->dev->stats; 362 struct dst_entry *dst = NULL, *ndst = NULL; 363 struct flowi6 fl6; 364 struct ipv6hdr *ipv6h = ipv6_hdr(skb); 365 struct net_device *tdev; 366 int err = -1; 367 368 if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) || 369 !ip6_tnl_xmit_ctl(t) || vti6_addr_conflict(t, ipv6h)) 370 return err; 371 372 dst = ip6_tnl_dst_check(t); 373 if (!dst) { 374 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); 375 376 ndst = ip6_route_output(net, NULL, &fl6); 377 378 if (ndst->error) 379 goto tx_err_link_failure; 380 ndst = xfrm_lookup(net, ndst, flowi6_to_flowi(&fl6), NULL, 0); 381 if (IS_ERR(ndst)) { 382 err = PTR_ERR(ndst); 383 ndst = NULL; 384 goto tx_err_link_failure; 385 } 386 dst = ndst; 387 } 388 389 if (!dst->xfrm || dst->xfrm->props.mode != XFRM_MODE_TUNNEL) 390 goto tx_err_link_failure; 391 392 tdev = dst->dev; 393 394 if (tdev == dev) { 395 stats->collisions++; 396 net_warn_ratelimited("%s: Local routing loop detected!\n", 397 t->parms.name); 398 goto tx_err_dst_release; 399 } 400 401 402 skb_dst_drop(skb); 403 skb_dst_set_noref(skb, dst); 404 405 ip6tunnel_xmit(skb, dev); 406 if (ndst) { 407 dev->mtu = dst_mtu(ndst); 408 ip6_tnl_dst_store(t, ndst); 409 } 410 411 return 0; 412 tx_err_link_failure: 413 stats->tx_carrier_errors++; 414 dst_link_failure(skb); 415 tx_err_dst_release: 416 dst_release(ndst); 417 return err; 418 } 419 420 static netdev_tx_t 421 vti6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) 422 { 423 struct ip6_tnl *t = netdev_priv(dev); 424 struct net_device_stats *stats = &t->dev->stats; 425 int ret; 426 427 switch (skb->protocol) { 428 case htons(ETH_P_IPV6): 429 ret = vti6_xmit(skb, dev); 430 break; 431 default: 432 goto tx_err; 433 } 434 435 if (ret < 0) 436 goto tx_err; 437 438 return NETDEV_TX_OK; 439 440 tx_err: 441 stats->tx_errors++; 442 stats->tx_dropped++; 443 kfree_skb(skb); 444 return NETDEV_TX_OK; 445 } 446 447 static void vti6_link_config(struct ip6_tnl *t) 448 { 449 struct dst_entry *dst; 450 struct net_device *dev = t->dev; 451 struct __ip6_tnl_parm *p = &t->parms; 452 struct flowi6 *fl6 = &t->fl.u.ip6; 453 454 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); 455 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); 456 457 /* Set up flowi template */ 458 fl6->saddr = p->laddr; 459 fl6->daddr = p->raddr; 460 fl6->flowi6_oif = p->link; 461 fl6->flowi6_mark = be32_to_cpu(p->i_key); 462 fl6->flowi6_proto = p->proto; 463 fl6->flowlabel = 0; 464 465 p->flags &= ~(IP6_TNL_F_CAP_XMIT | IP6_TNL_F_CAP_RCV | 466 IP6_TNL_F_CAP_PER_PACKET); 467 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr); 468 469 if (p->flags & IP6_TNL_F_CAP_XMIT && p->flags & IP6_TNL_F_CAP_RCV) 470 dev->flags |= IFF_POINTOPOINT; 471 else 472 dev->flags &= ~IFF_POINTOPOINT; 473 474 dev->iflink = p->link; 475 476 if (p->flags & IP6_TNL_F_CAP_XMIT) { 477 478 dst = ip6_route_output(dev_net(dev), NULL, fl6); 479 if (dst->error) 480 return; 481 482 dst = xfrm_lookup(dev_net(dev), dst, flowi6_to_flowi(fl6), 483 NULL, 0); 484 if (IS_ERR(dst)) 485 return; 486 487 if (dst->dev) { 488 dev->hard_header_len = dst->dev->hard_header_len; 489 490 dev->mtu = dst_mtu(dst); 491 492 if (dev->mtu < IPV6_MIN_MTU) 493 dev->mtu = IPV6_MIN_MTU; 494 } 495 dst_release(dst); 496 } 497 } 498 499 /** 500 * vti6_tnl_change - update the tunnel parameters 501 * @t: tunnel to be changed 502 * @p: tunnel configuration parameters 503 * 504 * Description: 505 * vti6_tnl_change() updates the tunnel parameters 506 **/ 507 static int 508 vti6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p) 509 { 510 t->parms.laddr = p->laddr; 511 t->parms.raddr = p->raddr; 512 t->parms.link = p->link; 513 t->parms.i_key = p->i_key; 514 t->parms.o_key = p->o_key; 515 t->parms.proto = p->proto; 516 ip6_tnl_dst_reset(t); 517 vti6_link_config(t); 518 return 0; 519 } 520 521 static int vti6_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p) 522 { 523 struct net *net = dev_net(t->dev); 524 struct vti6_net *ip6n = net_generic(net, vti6_net_id); 525 int err; 526 527 vti6_tnl_unlink(ip6n, t); 528 synchronize_net(); 529 err = vti6_tnl_change(t, p); 530 vti6_tnl_link(ip6n, t); 531 netdev_state_change(t->dev); 532 return err; 533 } 534 535 static void 536 vti6_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm2 *u) 537 { 538 p->laddr = u->laddr; 539 p->raddr = u->raddr; 540 p->link = u->link; 541 p->i_key = u->i_key; 542 p->o_key = u->o_key; 543 p->proto = u->proto; 544 545 memcpy(p->name, u->name, sizeof(u->name)); 546 } 547 548 static void 549 vti6_parm_to_user(struct ip6_tnl_parm2 *u, const struct __ip6_tnl_parm *p) 550 { 551 u->laddr = p->laddr; 552 u->raddr = p->raddr; 553 u->link = p->link; 554 u->i_key = p->i_key; 555 u->o_key = p->o_key; 556 u->proto = p->proto; 557 558 memcpy(u->name, p->name, sizeof(u->name)); 559 } 560 561 /** 562 * vti6_tnl_ioctl - configure vti6 tunnels from userspace 563 * @dev: virtual device associated with tunnel 564 * @ifr: parameters passed from userspace 565 * @cmd: command to be performed 566 * 567 * Description: 568 * vti6_ioctl() is used for managing vti6 tunnels 569 * from userspace. 570 * 571 * The possible commands are the following: 572 * %SIOCGETTUNNEL: get tunnel parameters for device 573 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters 574 * %SIOCCHGTUNNEL: change tunnel parameters to those given 575 * %SIOCDELTUNNEL: delete tunnel 576 * 577 * The fallback device "ip6_vti0", created during module 578 * initialization, can be used for creating other tunnel devices. 579 * 580 * Return: 581 * 0 on success, 582 * %-EFAULT if unable to copy data to or from userspace, 583 * %-EPERM if current process hasn't %CAP_NET_ADMIN set 584 * %-EINVAL if passed tunnel parameters are invalid, 585 * %-EEXIST if changing a tunnel's parameters would cause a conflict 586 * %-ENODEV if attempting to change or delete a nonexisting device 587 **/ 588 static int 589 vti6_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) 590 { 591 int err = 0; 592 struct ip6_tnl_parm2 p; 593 struct __ip6_tnl_parm p1; 594 struct ip6_tnl *t = NULL; 595 struct net *net = dev_net(dev); 596 struct vti6_net *ip6n = net_generic(net, vti6_net_id); 597 598 switch (cmd) { 599 case SIOCGETTUNNEL: 600 if (dev == ip6n->fb_tnl_dev) { 601 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { 602 err = -EFAULT; 603 break; 604 } 605 vti6_parm_from_user(&p1, &p); 606 t = vti6_locate(net, &p1, 0); 607 } else { 608 memset(&p, 0, sizeof(p)); 609 } 610 if (t == NULL) 611 t = netdev_priv(dev); 612 vti6_parm_to_user(&p, &t->parms); 613 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) 614 err = -EFAULT; 615 break; 616 case SIOCADDTUNNEL: 617 case SIOCCHGTUNNEL: 618 err = -EPERM; 619 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 620 break; 621 err = -EFAULT; 622 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 623 break; 624 err = -EINVAL; 625 if (p.proto != IPPROTO_IPV6 && p.proto != 0) 626 break; 627 vti6_parm_from_user(&p1, &p); 628 t = vti6_locate(net, &p1, cmd == SIOCADDTUNNEL); 629 if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) { 630 if (t != NULL) { 631 if (t->dev != dev) { 632 err = -EEXIST; 633 break; 634 } 635 } else 636 t = netdev_priv(dev); 637 638 err = vti6_update(t, &p1); 639 } 640 if (t) { 641 err = 0; 642 vti6_parm_to_user(&p, &t->parms); 643 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) 644 err = -EFAULT; 645 646 } else 647 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); 648 break; 649 case SIOCDELTUNNEL: 650 err = -EPERM; 651 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 652 break; 653 654 if (dev == ip6n->fb_tnl_dev) { 655 err = -EFAULT; 656 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 657 break; 658 err = -ENOENT; 659 vti6_parm_from_user(&p1, &p); 660 t = vti6_locate(net, &p1, 0); 661 if (t == NULL) 662 break; 663 err = -EPERM; 664 if (t->dev == ip6n->fb_tnl_dev) 665 break; 666 dev = t->dev; 667 } 668 err = 0; 669 unregister_netdevice(dev); 670 break; 671 default: 672 err = -EINVAL; 673 } 674 return err; 675 } 676 677 /** 678 * vti6_tnl_change_mtu - change mtu manually for tunnel device 679 * @dev: virtual device associated with tunnel 680 * @new_mtu: the new mtu 681 * 682 * Return: 683 * 0 on success, 684 * %-EINVAL if mtu too small 685 **/ 686 static int vti6_change_mtu(struct net_device *dev, int new_mtu) 687 { 688 if (new_mtu < IPV6_MIN_MTU) 689 return -EINVAL; 690 691 dev->mtu = new_mtu; 692 return 0; 693 } 694 695 static const struct net_device_ops vti6_netdev_ops = { 696 .ndo_uninit = vti6_dev_uninit, 697 .ndo_start_xmit = vti6_tnl_xmit, 698 .ndo_do_ioctl = vti6_ioctl, 699 .ndo_change_mtu = vti6_change_mtu, 700 .ndo_get_stats64 = ip_tunnel_get_stats64, 701 }; 702 703 /** 704 * vti6_dev_setup - setup virtual tunnel device 705 * @dev: virtual device associated with tunnel 706 * 707 * Description: 708 * Initialize function pointers and device parameters 709 **/ 710 static void vti6_dev_setup(struct net_device *dev) 711 { 712 struct ip6_tnl *t; 713 714 dev->netdev_ops = &vti6_netdev_ops; 715 dev->destructor = vti6_dev_free; 716 717 dev->type = ARPHRD_TUNNEL6; 718 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct ipv6hdr); 719 dev->mtu = ETH_DATA_LEN; 720 t = netdev_priv(dev); 721 dev->flags |= IFF_NOARP; 722 dev->addr_len = sizeof(struct in6_addr); 723 dev->features |= NETIF_F_NETNS_LOCAL; 724 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; 725 } 726 727 /** 728 * vti6_dev_init_gen - general initializer for all tunnel devices 729 * @dev: virtual device associated with tunnel 730 **/ 731 static inline int vti6_dev_init_gen(struct net_device *dev) 732 { 733 struct ip6_tnl *t = netdev_priv(dev); 734 int i; 735 736 t->dev = dev; 737 t->net = dev_net(dev); 738 dev->tstats = alloc_percpu(struct pcpu_sw_netstats); 739 if (!dev->tstats) 740 return -ENOMEM; 741 for_each_possible_cpu(i) { 742 struct pcpu_sw_netstats *stats; 743 stats = per_cpu_ptr(dev->tstats, i); 744 u64_stats_init(&stats->syncp); 745 } 746 return 0; 747 } 748 749 /** 750 * vti6_dev_init - initializer for all non fallback tunnel devices 751 * @dev: virtual device associated with tunnel 752 **/ 753 static int vti6_dev_init(struct net_device *dev) 754 { 755 struct ip6_tnl *t = netdev_priv(dev); 756 int err = vti6_dev_init_gen(dev); 757 758 if (err) 759 return err; 760 vti6_link_config(t); 761 return 0; 762 } 763 764 /** 765 * vti6_fb_tnl_dev_init - initializer for fallback tunnel device 766 * @dev: fallback device 767 * 768 * Return: 0 769 **/ 770 static int __net_init vti6_fb_tnl_dev_init(struct net_device *dev) 771 { 772 struct ip6_tnl *t = netdev_priv(dev); 773 struct net *net = dev_net(dev); 774 struct vti6_net *ip6n = net_generic(net, vti6_net_id); 775 int err = vti6_dev_init_gen(dev); 776 777 if (err) 778 return err; 779 780 t->parms.proto = IPPROTO_IPV6; 781 dev_hold(dev); 782 783 vti6_link_config(t); 784 785 rcu_assign_pointer(ip6n->tnls_wc[0], t); 786 return 0; 787 } 788 789 static int vti6_validate(struct nlattr *tb[], struct nlattr *data[]) 790 { 791 return 0; 792 } 793 794 static void vti6_netlink_parms(struct nlattr *data[], 795 struct __ip6_tnl_parm *parms) 796 { 797 memset(parms, 0, sizeof(*parms)); 798 799 if (!data) 800 return; 801 802 if (data[IFLA_VTI_LINK]) 803 parms->link = nla_get_u32(data[IFLA_VTI_LINK]); 804 805 if (data[IFLA_VTI_LOCAL]) 806 nla_memcpy(&parms->laddr, data[IFLA_VTI_LOCAL], 807 sizeof(struct in6_addr)); 808 809 if (data[IFLA_VTI_REMOTE]) 810 nla_memcpy(&parms->raddr, data[IFLA_VTI_REMOTE], 811 sizeof(struct in6_addr)); 812 813 if (data[IFLA_VTI_IKEY]) 814 parms->i_key = nla_get_be32(data[IFLA_VTI_IKEY]); 815 816 if (data[IFLA_VTI_OKEY]) 817 parms->o_key = nla_get_be32(data[IFLA_VTI_OKEY]); 818 } 819 820 static int vti6_newlink(struct net *src_net, struct net_device *dev, 821 struct nlattr *tb[], struct nlattr *data[]) 822 { 823 struct net *net = dev_net(dev); 824 struct ip6_tnl *nt; 825 826 nt = netdev_priv(dev); 827 vti6_netlink_parms(data, &nt->parms); 828 829 nt->parms.proto = IPPROTO_IPV6; 830 831 if (vti6_locate(net, &nt->parms, 0)) 832 return -EEXIST; 833 834 return vti6_tnl_create2(dev); 835 } 836 837 static int vti6_changelink(struct net_device *dev, struct nlattr *tb[], 838 struct nlattr *data[]) 839 { 840 struct ip6_tnl *t; 841 struct __ip6_tnl_parm p; 842 struct net *net = dev_net(dev); 843 struct vti6_net *ip6n = net_generic(net, vti6_net_id); 844 845 if (dev == ip6n->fb_tnl_dev) 846 return -EINVAL; 847 848 vti6_netlink_parms(data, &p); 849 850 t = vti6_locate(net, &p, 0); 851 852 if (t) { 853 if (t->dev != dev) 854 return -EEXIST; 855 } else 856 t = netdev_priv(dev); 857 858 return vti6_update(t, &p); 859 } 860 861 static size_t vti6_get_size(const struct net_device *dev) 862 { 863 return 864 /* IFLA_VTI_LINK */ 865 nla_total_size(4) + 866 /* IFLA_VTI_LOCAL */ 867 nla_total_size(sizeof(struct in6_addr)) + 868 /* IFLA_VTI_REMOTE */ 869 nla_total_size(sizeof(struct in6_addr)) + 870 /* IFLA_VTI_IKEY */ 871 nla_total_size(4) + 872 /* IFLA_VTI_OKEY */ 873 nla_total_size(4) + 874 0; 875 } 876 877 static int vti6_fill_info(struct sk_buff *skb, const struct net_device *dev) 878 { 879 struct ip6_tnl *tunnel = netdev_priv(dev); 880 struct __ip6_tnl_parm *parm = &tunnel->parms; 881 882 if (nla_put_u32(skb, IFLA_VTI_LINK, parm->link) || 883 nla_put(skb, IFLA_VTI_LOCAL, sizeof(struct in6_addr), 884 &parm->laddr) || 885 nla_put(skb, IFLA_VTI_REMOTE, sizeof(struct in6_addr), 886 &parm->raddr) || 887 nla_put_be32(skb, IFLA_VTI_IKEY, parm->i_key) || 888 nla_put_be32(skb, IFLA_VTI_OKEY, parm->o_key)) 889 goto nla_put_failure; 890 return 0; 891 892 nla_put_failure: 893 return -EMSGSIZE; 894 } 895 896 static const struct nla_policy vti6_policy[IFLA_VTI_MAX + 1] = { 897 [IFLA_VTI_LINK] = { .type = NLA_U32 }, 898 [IFLA_VTI_LOCAL] = { .len = sizeof(struct in6_addr) }, 899 [IFLA_VTI_REMOTE] = { .len = sizeof(struct in6_addr) }, 900 [IFLA_VTI_IKEY] = { .type = NLA_U32 }, 901 [IFLA_VTI_OKEY] = { .type = NLA_U32 }, 902 }; 903 904 static struct rtnl_link_ops vti6_link_ops __read_mostly = { 905 .kind = "vti6", 906 .maxtype = IFLA_VTI_MAX, 907 .policy = vti6_policy, 908 .priv_size = sizeof(struct ip6_tnl), 909 .setup = vti6_dev_setup, 910 .validate = vti6_validate, 911 .newlink = vti6_newlink, 912 .changelink = vti6_changelink, 913 .get_size = vti6_get_size, 914 .fill_info = vti6_fill_info, 915 }; 916 917 static struct xfrm_tunnel_notifier vti6_handler __read_mostly = { 918 .handler = vti6_rcv, 919 .priority = 1, 920 }; 921 922 static void __net_exit vti6_destroy_tunnels(struct vti6_net *ip6n) 923 { 924 int h; 925 struct ip6_tnl *t; 926 LIST_HEAD(list); 927 928 for (h = 0; h < HASH_SIZE; h++) { 929 t = rtnl_dereference(ip6n->tnls_r_l[h]); 930 while (t != NULL) { 931 unregister_netdevice_queue(t->dev, &list); 932 t = rtnl_dereference(t->next); 933 } 934 } 935 936 t = rtnl_dereference(ip6n->tnls_wc[0]); 937 unregister_netdevice_queue(t->dev, &list); 938 unregister_netdevice_many(&list); 939 } 940 941 static int __net_init vti6_init_net(struct net *net) 942 { 943 struct vti6_net *ip6n = net_generic(net, vti6_net_id); 944 struct ip6_tnl *t = NULL; 945 int err; 946 947 ip6n->tnls[0] = ip6n->tnls_wc; 948 ip6n->tnls[1] = ip6n->tnls_r_l; 949 950 err = -ENOMEM; 951 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6_vti0", 952 vti6_dev_setup); 953 954 if (!ip6n->fb_tnl_dev) 955 goto err_alloc_dev; 956 dev_net_set(ip6n->fb_tnl_dev, net); 957 958 err = vti6_fb_tnl_dev_init(ip6n->fb_tnl_dev); 959 if (err < 0) 960 goto err_register; 961 962 err = register_netdev(ip6n->fb_tnl_dev); 963 if (err < 0) 964 goto err_register; 965 966 t = netdev_priv(ip6n->fb_tnl_dev); 967 968 strcpy(t->parms.name, ip6n->fb_tnl_dev->name); 969 return 0; 970 971 err_register: 972 vti6_dev_free(ip6n->fb_tnl_dev); 973 err_alloc_dev: 974 return err; 975 } 976 977 static void __net_exit vti6_exit_net(struct net *net) 978 { 979 struct vti6_net *ip6n = net_generic(net, vti6_net_id); 980 981 rtnl_lock(); 982 vti6_destroy_tunnels(ip6n); 983 rtnl_unlock(); 984 } 985 986 static struct pernet_operations vti6_net_ops = { 987 .init = vti6_init_net, 988 .exit = vti6_exit_net, 989 .id = &vti6_net_id, 990 .size = sizeof(struct vti6_net), 991 }; 992 993 /** 994 * vti6_tunnel_init - register protocol and reserve needed resources 995 * 996 * Return: 0 on success 997 **/ 998 static int __init vti6_tunnel_init(void) 999 { 1000 int err; 1001 1002 err = register_pernet_device(&vti6_net_ops); 1003 if (err < 0) 1004 goto out_pernet; 1005 1006 err = xfrm6_mode_tunnel_input_register(&vti6_handler); 1007 if (err < 0) { 1008 pr_err("%s: can't register vti6\n", __func__); 1009 goto out; 1010 } 1011 err = rtnl_link_register(&vti6_link_ops); 1012 if (err < 0) 1013 goto rtnl_link_failed; 1014 1015 return 0; 1016 1017 rtnl_link_failed: 1018 xfrm6_mode_tunnel_input_deregister(&vti6_handler); 1019 out: 1020 unregister_pernet_device(&vti6_net_ops); 1021 out_pernet: 1022 return err; 1023 } 1024 1025 /** 1026 * vti6_tunnel_cleanup - free resources and unregister protocol 1027 **/ 1028 static void __exit vti6_tunnel_cleanup(void) 1029 { 1030 rtnl_link_unregister(&vti6_link_ops); 1031 if (xfrm6_mode_tunnel_input_deregister(&vti6_handler)) 1032 pr_info("%s: can't deregister vti6\n", __func__); 1033 1034 unregister_pernet_device(&vti6_net_ops); 1035 } 1036 1037 module_init(vti6_tunnel_init); 1038 module_exit(vti6_tunnel_cleanup); 1039 MODULE_LICENSE("GPL"); 1040 MODULE_ALIAS_RTNL_LINK("vti6"); 1041 MODULE_ALIAS_NETDEV("ip6_vti0"); 1042 MODULE_AUTHOR("Steffen Klassert"); 1043 MODULE_DESCRIPTION("IPv6 virtual tunnel interface"); 1044