1// SPDX-License-Identifier: GPL-2.0-only 2#include <linux/types.h> 3#include <linux/skbuff.h> 4#include <linux/socket.h> 5#include <linux/sysctl.h> 6#include <linux/net.h> 7#include <linux/module.h> 8#include <linux/if_arp.h> 9#include <linux/ipv6.h> 10#include <linux/mpls.h> 11#include <linux/netconf.h> 12#include <linux/nospec.h> 13#include <linux/vmalloc.h> 14#include <linux/percpu.h> 15#include <net/ip.h> 16#include <net/dst.h> 17#include <net/sock.h> 18#include <net/arp.h> 19#include <net/ip_fib.h> 20#include <net/netevent.h> 21#include <net/ip_tunnels.h> 22#include <net/netns/generic.h> 23#if IS_ENABLED(CONFIG_IPV6) 24#include <net/ipv6.h> 25#endif 26#include <net/ipv6_stubs.h> 27#include <net/rtnh.h> 28#include "internal.h" 29 30/* max memory we will use for mpls_route */ 31#define MAX_MPLS_ROUTE_MEM 4096 32 33/* Maximum number of labels to look ahead at when selecting a path of 34 * a multipath route 35 */ 36#define MAX_MP_SELECT_LABELS 4 37 38#define MPLS_NEIGH_TABLE_UNSPEC (NEIGH_LINK_TABLE + 1) 39 40static int label_limit = (1 << 20) - 1; 41static int ttl_max = 255; 42 43#if IS_ENABLED(CONFIG_NET_IP_TUNNEL) 44static size_t ipgre_mpls_encap_hlen(struct ip_tunnel_encap *e) 45{ 46 return sizeof(struct mpls_shim_hdr); 47} 48 49static const struct ip_tunnel_encap_ops mpls_iptun_ops = { 50 .encap_hlen = ipgre_mpls_encap_hlen, 51}; 52 53static int ipgre_tunnel_encap_add_mpls_ops(void) 54{ 55 return ip_tunnel_encap_add_ops(&mpls_iptun_ops, TUNNEL_ENCAP_MPLS); 56} 57 58static void ipgre_tunnel_encap_del_mpls_ops(void) 59{ 60 ip_tunnel_encap_del_ops(&mpls_iptun_ops, TUNNEL_ENCAP_MPLS); 61} 62#else 63static int ipgre_tunnel_encap_add_mpls_ops(void) 64{ 65 return 0; 66} 67 68static void ipgre_tunnel_encap_del_mpls_ops(void) 69{ 70} 71#endif 72 73static void rtmsg_lfib(int event, u32 label, struct mpls_route *rt, 74 struct nlmsghdr *nlh, struct net *net, u32 portid, 75 unsigned int nlm_flags); 76 77static struct mpls_route *mpls_route_input_rcu(struct net *net, unsigned index) 78{ 79 struct mpls_route *rt = NULL; 80 81 if (index < net->mpls.platform_labels) { 82 struct mpls_route __rcu **platform_label = 83 rcu_dereference(net->mpls.platform_label); 84 rt = rcu_dereference(platform_label[index]); 85 } 86 return rt; 87} 88 89bool mpls_output_possible(const struct net_device *dev) 90{ 91 return dev && (dev->flags & IFF_UP) && netif_carrier_ok(dev); 92} 93EXPORT_SYMBOL_GPL(mpls_output_possible); 94 95static u8 *__mpls_nh_via(struct mpls_route *rt, struct mpls_nh *nh) 96{ 97 return (u8 *)nh + rt->rt_via_offset; 98} 99 100static const u8 *mpls_nh_via(const struct mpls_route *rt, 101 const struct mpls_nh *nh) 102{ 103 return __mpls_nh_via((struct mpls_route *)rt, (struct mpls_nh *)nh); 104} 105 106static unsigned int mpls_nh_header_size(const struct mpls_nh *nh) 107{ 108 /* The size of the layer 2.5 labels to be added for this route */ 109 return nh->nh_labels * sizeof(struct mpls_shim_hdr); 110} 111 112unsigned int mpls_dev_mtu(const struct net_device *dev) 113{ 114 /* The amount of data the layer 2 frame can hold */ 115 return dev->mtu; 116} 117EXPORT_SYMBOL_GPL(mpls_dev_mtu); 118 119bool mpls_pkt_too_big(const struct sk_buff *skb, unsigned int mtu) 120{ 121 if (skb->len <= mtu) 122 return false; 123 124 if (skb_is_gso(skb) && skb_gso_validate_network_len(skb, mtu)) 125 return false; 126 127 return true; 128} 129EXPORT_SYMBOL_GPL(mpls_pkt_too_big); 130 131void mpls_stats_inc_outucastpkts(struct net_device *dev, 132 const struct sk_buff *skb) 133{ 134 struct mpls_dev *mdev; 135 136 if (skb->protocol == htons(ETH_P_MPLS_UC)) { 137 mdev = mpls_dev_get(dev); 138 if (mdev) 139 MPLS_INC_STATS_LEN(mdev, skb->len, 140 tx_packets, 141 tx_bytes); 142 } else if (skb->protocol == htons(ETH_P_IP)) { 143 IP_UPD_PO_STATS(dev_net(dev), IPSTATS_MIB_OUT, skb->len); 144#if IS_ENABLED(CONFIG_IPV6) 145 } else if (skb->protocol == htons(ETH_P_IPV6)) { 146 struct inet6_dev *in6dev = __in6_dev_get(dev); 147 148 if (in6dev) 149 IP6_UPD_PO_STATS(dev_net(dev), in6dev, 150 IPSTATS_MIB_OUT, skb->len); 151#endif 152 } 153} 154EXPORT_SYMBOL_GPL(mpls_stats_inc_outucastpkts); 155 156static u32 mpls_multipath_hash(struct mpls_route *rt, struct sk_buff *skb) 157{ 158 struct mpls_entry_decoded dec; 159 unsigned int mpls_hdr_len = 0; 160 struct mpls_shim_hdr *hdr; 161 bool eli_seen = false; 162 int label_index; 163 u32 hash = 0; 164 165 for (label_index = 0; label_index < MAX_MP_SELECT_LABELS; 166 label_index++) { 167 mpls_hdr_len += sizeof(*hdr); 168 if (!pskb_may_pull(skb, mpls_hdr_len)) 169 break; 170 171 /* Read and decode the current label */ 172 hdr = mpls_hdr(skb) + label_index; 173 dec = mpls_entry_decode(hdr); 174 175 /* RFC6790 - reserved labels MUST NOT be used as keys 176 * for the load-balancing function 177 */ 178 if (likely(dec.label >= MPLS_LABEL_FIRST_UNRESERVED)) { 179 hash = jhash_1word(dec.label, hash); 180 181 /* The entropy label follows the entropy label 182 * indicator, so this means that the entropy 183 * label was just added to the hash - no need to 184 * go any deeper either in the label stack or in the 185 * payload 186 */ 187 if (eli_seen) 188 break; 189 } else if (dec.label == MPLS_LABEL_ENTROPY) { 190 eli_seen = true; 191 } 192 193 if (!dec.bos) 194 continue; 195 196 /* found bottom label; does skb have room for a header? */ 197 if (pskb_may_pull(skb, mpls_hdr_len + sizeof(struct iphdr))) { 198 const struct iphdr *v4hdr; 199 200 v4hdr = (const struct iphdr *)(hdr + 1); 201 if (v4hdr->version == 4) { 202 hash = jhash_3words(ntohl(v4hdr->saddr), 203 ntohl(v4hdr->daddr), 204 v4hdr->protocol, hash); 205 } else if (v4hdr->version == 6 && 206 pskb_may_pull(skb, mpls_hdr_len + 207 sizeof(struct ipv6hdr))) { 208 const struct ipv6hdr *v6hdr; 209 210 v6hdr = (const struct ipv6hdr *)(hdr + 1); 211 hash = __ipv6_addr_jhash(&v6hdr->saddr, hash); 212 hash = __ipv6_addr_jhash(&v6hdr->daddr, hash); 213 hash = jhash_1word(v6hdr->nexthdr, hash); 214 } 215 } 216 217 break; 218 } 219 220 return hash; 221} 222 223static struct mpls_nh *mpls_get_nexthop(struct mpls_route *rt, u8 index) 224{ 225 return (struct mpls_nh *)((u8 *)rt->rt_nh + index * rt->rt_nh_size); 226} 227 228/* number of alive nexthops (rt->rt_nhn_alive) and the flags for 229 * a next hop (nh->nh_flags) are modified by netdev event handlers. 230 * Since those fields can change at any moment, use READ_ONCE to 231 * access both. 232 */ 233static struct mpls_nh *mpls_select_multipath(struct mpls_route *rt, 234 struct sk_buff *skb) 235{ 236 u32 hash = 0; 237 int nh_index = 0; 238 int n = 0; 239 u8 alive; 240 241 /* No need to look further into packet if there's only 242 * one path 243 */ 244 if (rt->rt_nhn == 1) 245 return rt->rt_nh; 246 247 alive = READ_ONCE(rt->rt_nhn_alive); 248 if (alive == 0) 249 return NULL; 250 251 hash = mpls_multipath_hash(rt, skb); 252 nh_index = hash % alive; 253 if (alive == rt->rt_nhn) 254 goto out; 255 for_nexthops(rt) { 256 unsigned int nh_flags = READ_ONCE(nh->nh_flags); 257 258 if (nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)) 259 continue; 260 if (n == nh_index) 261 return nh; 262 n++; 263 } endfor_nexthops(rt); 264 265out: 266 return mpls_get_nexthop(rt, nh_index); 267} 268 269static bool mpls_egress(struct net *net, struct mpls_route *rt, 270 struct sk_buff *skb, struct mpls_entry_decoded dec) 271{ 272 enum mpls_payload_type payload_type; 273 bool success = false; 274 275 /* The IPv4 code below accesses through the IPv4 header 276 * checksum, which is 12 bytes into the packet. 277 * The IPv6 code below accesses through the IPv6 hop limit 278 * which is 8 bytes into the packet. 279 * 280 * For all supported cases there should always be at least 12 281 * bytes of packet data present. The IPv4 header is 20 bytes 282 * without options and the IPv6 header is always 40 bytes 283 * long. 284 */ 285 if (!pskb_may_pull(skb, 12)) 286 return false; 287 288 payload_type = rt->rt_payload_type; 289 if (payload_type == MPT_UNSPEC) 290 payload_type = ip_hdr(skb)->version; 291 292 switch (payload_type) { 293 case MPT_IPV4: { 294 struct iphdr *hdr4 = ip_hdr(skb); 295 u8 new_ttl; 296 skb->protocol = htons(ETH_P_IP); 297 298 /* If propagating TTL, take the decremented TTL from 299 * the incoming MPLS header, otherwise decrement the 300 * TTL, but only if not 0 to avoid underflow. 301 */ 302 if (rt->rt_ttl_propagate == MPLS_TTL_PROP_ENABLED || 303 (rt->rt_ttl_propagate == MPLS_TTL_PROP_DEFAULT && 304 net->mpls.ip_ttl_propagate)) 305 new_ttl = dec.ttl; 306 else 307 new_ttl = hdr4->ttl ? hdr4->ttl - 1 : 0; 308 309 csum_replace2(&hdr4->check, 310 htons(hdr4->ttl << 8), 311 htons(new_ttl << 8)); 312 hdr4->ttl = new_ttl; 313 success = true; 314 break; 315 } 316 case MPT_IPV6: { 317 struct ipv6hdr *hdr6 = ipv6_hdr(skb); 318 skb->protocol = htons(ETH_P_IPV6); 319 320 /* If propagating TTL, take the decremented TTL from 321 * the incoming MPLS header, otherwise decrement the 322 * hop limit, but only if not 0 to avoid underflow. 323 */ 324 if (rt->rt_ttl_propagate == MPLS_TTL_PROP_ENABLED || 325 (rt->rt_ttl_propagate == MPLS_TTL_PROP_DEFAULT && 326 net->mpls.ip_ttl_propagate)) 327 hdr6->hop_limit = dec.ttl; 328 else if (hdr6->hop_limit) 329 hdr6->hop_limit = hdr6->hop_limit - 1; 330 success = true; 331 break; 332 } 333 case MPT_UNSPEC: 334 /* Should have decided which protocol it is by now */ 335 break; 336 } 337 338 return success; 339} 340 341static int mpls_forward(struct sk_buff *skb, struct net_device *dev, 342 struct packet_type *pt, struct net_device *orig_dev) 343{ 344 struct net *net = dev_net(dev); 345 struct mpls_shim_hdr *hdr; 346 struct mpls_route *rt; 347 struct mpls_nh *nh; 348 struct mpls_entry_decoded dec; 349 struct net_device *out_dev; 350 struct mpls_dev *out_mdev; 351 struct mpls_dev *mdev; 352 unsigned int hh_len; 353 unsigned int new_header_size; 354 unsigned int mtu; 355 int err; 356 357 /* Careful this entire function runs inside of an rcu critical section */ 358 359 mdev = mpls_dev_get(dev); 360 if (!mdev) 361 goto drop; 362 363 MPLS_INC_STATS_LEN(mdev, skb->len, rx_packets, 364 rx_bytes); 365 366 if (!mdev->input_enabled) { 367 MPLS_INC_STATS(mdev, rx_dropped); 368 goto drop; 369 } 370 371 if (skb->pkt_type != PACKET_HOST) 372 goto err; 373 374 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) 375 goto err; 376 377 if (!pskb_may_pull(skb, sizeof(*hdr))) 378 goto err; 379 380 /* Read and decode the label */ 381 hdr = mpls_hdr(skb); 382 dec = mpls_entry_decode(hdr); 383 384 rt = mpls_route_input_rcu(net, dec.label); 385 if (!rt) { 386 MPLS_INC_STATS(mdev, rx_noroute); 387 goto drop; 388 } 389 390 nh = mpls_select_multipath(rt, skb); 391 if (!nh) 392 goto err; 393 394 /* Pop the label */ 395 skb_pull(skb, sizeof(*hdr)); 396 skb_reset_network_header(skb); 397 398 skb_orphan(skb); 399 400 if (skb_warn_if_lro(skb)) 401 goto err; 402 403 skb_forward_csum(skb); 404 405 /* Verify ttl is valid */ 406 if (dec.ttl <= 1) 407 goto err; 408 dec.ttl -= 1; 409 410 /* Find the output device */ 411 out_dev = rcu_dereference(nh->nh_dev); 412 if (!mpls_output_possible(out_dev)) 413 goto tx_err; 414 415 /* Verify the destination can hold the packet */ 416 new_header_size = mpls_nh_header_size(nh); 417 mtu = mpls_dev_mtu(out_dev); 418 if (mpls_pkt_too_big(skb, mtu - new_header_size)) 419 goto tx_err; 420 421 hh_len = LL_RESERVED_SPACE(out_dev); 422 if (!out_dev->header_ops) 423 hh_len = 0; 424 425 /* Ensure there is enough space for the headers in the skb */ 426 if (skb_cow(skb, hh_len + new_header_size)) 427 goto tx_err; 428 429 skb->dev = out_dev; 430 skb->protocol = htons(ETH_P_MPLS_UC); 431 432 if (unlikely(!new_header_size && dec.bos)) { 433 /* Penultimate hop popping */ 434 if (!mpls_egress(dev_net(out_dev), rt, skb, dec)) 435 goto err; 436 } else { 437 bool bos; 438 int i; 439 skb_push(skb, new_header_size); 440 skb_reset_network_header(skb); 441 /* Push the new labels */ 442 hdr = mpls_hdr(skb); 443 bos = dec.bos; 444 for (i = nh->nh_labels - 1; i >= 0; i--) { 445 hdr[i] = mpls_entry_encode(nh->nh_label[i], 446 dec.ttl, 0, bos); 447 bos = false; 448 } 449 } 450 451 mpls_stats_inc_outucastpkts(out_dev, skb); 452 453 /* If via wasn't specified then send out using device address */ 454 if (nh->nh_via_table == MPLS_NEIGH_TABLE_UNSPEC) 455 err = neigh_xmit(NEIGH_LINK_TABLE, out_dev, 456 out_dev->dev_addr, skb); 457 else 458 err = neigh_xmit(nh->nh_via_table, out_dev, 459 mpls_nh_via(rt, nh), skb); 460 if (err) 461 net_dbg_ratelimited("%s: packet transmission failed: %d\n", 462 __func__, err); 463 return 0; 464 465tx_err: 466 out_mdev = out_dev ? mpls_dev_get(out_dev) : NULL; 467 if (out_mdev) 468 MPLS_INC_STATS(out_mdev, tx_errors); 469 goto drop; 470err: 471 MPLS_INC_STATS(mdev, rx_errors); 472drop: 473 kfree_skb(skb); 474 return NET_RX_DROP; 475} 476 477static struct packet_type mpls_packet_type __read_mostly = { 478 .type = cpu_to_be16(ETH_P_MPLS_UC), 479 .func = mpls_forward, 480}; 481 482static const struct nla_policy rtm_mpls_policy[RTA_MAX+1] = { 483 [RTA_DST] = { .type = NLA_U32 }, 484 [RTA_OIF] = { .type = NLA_U32 }, 485 [RTA_TTL_PROPAGATE] = { .type = NLA_U8 }, 486}; 487 488struct mpls_route_config { 489 u32 rc_protocol; 490 u32 rc_ifindex; 491 u8 rc_via_table; 492 u8 rc_via_alen; 493 u8 rc_via[MAX_VIA_ALEN]; 494 u32 rc_label; 495 u8 rc_ttl_propagate; 496 u8 rc_output_labels; 497 u32 rc_output_label[MAX_NEW_LABELS]; 498 u32 rc_nlflags; 499 enum mpls_payload_type rc_payload_type; 500 struct nl_info rc_nlinfo; 501 struct rtnexthop *rc_mp; 502 int rc_mp_len; 503}; 504 505/* all nexthops within a route have the same size based on max 506 * number of labels and max via length for a hop 507 */ 508static struct mpls_route *mpls_rt_alloc(u8 num_nh, u8 max_alen, u8 max_labels) 509{ 510 u8 nh_size = MPLS_NH_SIZE(max_labels, max_alen); 511 struct mpls_route *rt; 512 size_t size; 513 514 size = sizeof(*rt) + num_nh * nh_size; 515 if (size > MAX_MPLS_ROUTE_MEM) 516 return ERR_PTR(-EINVAL); 517 518 rt = kzalloc(size, GFP_KERNEL); 519 if (!rt) 520 return ERR_PTR(-ENOMEM); 521 522 rt->rt_nhn = num_nh; 523 rt->rt_nhn_alive = num_nh; 524 rt->rt_nh_size = nh_size; 525 rt->rt_via_offset = MPLS_NH_VIA_OFF(max_labels); 526 527 return rt; 528} 529 530static void mpls_rt_free(struct mpls_route *rt) 531{ 532 if (rt) 533 kfree_rcu(rt, rt_rcu); 534} 535 536static void mpls_notify_route(struct net *net, unsigned index, 537 struct mpls_route *old, struct mpls_route *new, 538 const struct nl_info *info) 539{ 540 struct nlmsghdr *nlh = info ? info->nlh : NULL; 541 unsigned portid = info ? info->portid : 0; 542 int event = new ? RTM_NEWROUTE : RTM_DELROUTE; 543 struct mpls_route *rt = new ? new : old; 544 unsigned nlm_flags = (old && new) ? NLM_F_REPLACE : 0; 545 /* Ignore reserved labels for now */ 546 if (rt && (index >= MPLS_LABEL_FIRST_UNRESERVED)) 547 rtmsg_lfib(event, index, rt, nlh, net, portid, nlm_flags); 548} 549 550static void mpls_route_update(struct net *net, unsigned index, 551 struct mpls_route *new, 552 const struct nl_info *info) 553{ 554 struct mpls_route __rcu **platform_label; 555 struct mpls_route *rt; 556 557 ASSERT_RTNL(); 558 559 platform_label = rtnl_dereference(net->mpls.platform_label); 560 rt = rtnl_dereference(platform_label[index]); 561 rcu_assign_pointer(platform_label[index], new); 562 563 mpls_notify_route(net, index, rt, new, info); 564 565 /* If we removed a route free it now */ 566 mpls_rt_free(rt); 567} 568 569static unsigned find_free_label(struct net *net) 570{ 571 struct mpls_route __rcu **platform_label; 572 size_t platform_labels; 573 unsigned index; 574 575 platform_label = rtnl_dereference(net->mpls.platform_label); 576 platform_labels = net->mpls.platform_labels; 577 for (index = MPLS_LABEL_FIRST_UNRESERVED; index < platform_labels; 578 index++) { 579 if (!rtnl_dereference(platform_label[index])) 580 return index; 581 } 582 return LABEL_NOT_SPECIFIED; 583} 584 585#if IS_ENABLED(CONFIG_INET) 586static struct net_device *inet_fib_lookup_dev(struct net *net, 587 const void *addr) 588{ 589 struct net_device *dev; 590 struct rtable *rt; 591 struct in_addr daddr; 592 593 memcpy(&daddr, addr, sizeof(struct in_addr)); 594 rt = ip_route_output(net, daddr.s_addr, 0, 0, 0); 595 if (IS_ERR(rt)) 596 return ERR_CAST(rt); 597 598 dev = rt->dst.dev; 599 dev_hold(dev); 600 601 ip_rt_put(rt); 602 603 return dev; 604} 605#else 606static struct net_device *inet_fib_lookup_dev(struct net *net, 607 const void *addr) 608{ 609 return ERR_PTR(-EAFNOSUPPORT); 610} 611#endif 612 613#if IS_ENABLED(CONFIG_IPV6) 614static struct net_device *inet6_fib_lookup_dev(struct net *net, 615 const void *addr) 616{ 617 struct net_device *dev; 618 struct dst_entry *dst; 619 struct flowi6 fl6; 620 621 if (!ipv6_stub) 622 return ERR_PTR(-EAFNOSUPPORT); 623 624 memset(&fl6, 0, sizeof(fl6)); 625 memcpy(&fl6.daddr, addr, sizeof(struct in6_addr)); 626 dst = ipv6_stub->ipv6_dst_lookup_flow(net, NULL, &fl6, NULL); 627 if (IS_ERR(dst)) 628 return ERR_CAST(dst); 629 630 dev = dst->dev; 631 dev_hold(dev); 632 dst_release(dst); 633 634 return dev; 635} 636#else 637static struct net_device *inet6_fib_lookup_dev(struct net *net, 638 const void *addr) 639{ 640 return ERR_PTR(-EAFNOSUPPORT); 641} 642#endif 643 644static struct net_device *find_outdev(struct net *net, 645 struct mpls_route *rt, 646 struct mpls_nh *nh, int oif) 647{ 648 struct net_device *dev = NULL; 649 650 if (!oif) { 651 switch (nh->nh_via_table) { 652 case NEIGH_ARP_TABLE: 653 dev = inet_fib_lookup_dev(net, mpls_nh_via(rt, nh)); 654 break; 655 case NEIGH_ND_TABLE: 656 dev = inet6_fib_lookup_dev(net, mpls_nh_via(rt, nh)); 657 break; 658 case NEIGH_LINK_TABLE: 659 break; 660 } 661 } else { 662 dev = dev_get_by_index(net, oif); 663 } 664 665 if (!dev) 666 return ERR_PTR(-ENODEV); 667 668 if (IS_ERR(dev)) 669 return dev; 670 671 /* The caller is holding rtnl anyways, so release the dev reference */ 672 dev_put(dev); 673 674 return dev; 675} 676 677static int mpls_nh_assign_dev(struct net *net, struct mpls_route *rt, 678 struct mpls_nh *nh, int oif) 679{ 680 struct net_device *dev = NULL; 681 int err = -ENODEV; 682 683 dev = find_outdev(net, rt, nh, oif); 684 if (IS_ERR(dev)) { 685 err = PTR_ERR(dev); 686 dev = NULL; 687 goto errout; 688 } 689 690 /* Ensure this is a supported device */ 691 err = -EINVAL; 692 if (!mpls_dev_get(dev)) 693 goto errout; 694 695 if ((nh->nh_via_table == NEIGH_LINK_TABLE) && 696 (dev->addr_len != nh->nh_via_alen)) 697 goto errout; 698 699 RCU_INIT_POINTER(nh->nh_dev, dev); 700 701 if (!(dev->flags & IFF_UP)) { 702 nh->nh_flags |= RTNH_F_DEAD; 703 } else { 704 unsigned int flags; 705 706 flags = dev_get_flags(dev); 707 if (!(flags & (IFF_RUNNING | IFF_LOWER_UP))) 708 nh->nh_flags |= RTNH_F_LINKDOWN; 709 } 710 711 return 0; 712 713errout: 714 return err; 715} 716 717static int nla_get_via(const struct nlattr *nla, u8 *via_alen, u8 *via_table, 718 u8 via_addr[], struct netlink_ext_ack *extack) 719{ 720 struct rtvia *via = nla_data(nla); 721 int err = -EINVAL; 722 int alen; 723 724 if (nla_len(nla) < offsetof(struct rtvia, rtvia_addr)) { 725 NL_SET_ERR_MSG_ATTR(extack, nla, 726 "Invalid attribute length for RTA_VIA"); 727 goto errout; 728 } 729 alen = nla_len(nla) - 730 offsetof(struct rtvia, rtvia_addr); 731 if (alen > MAX_VIA_ALEN) { 732 NL_SET_ERR_MSG_ATTR(extack, nla, 733 "Invalid address length for RTA_VIA"); 734 goto errout; 735 } 736 737 /* Validate the address family */ 738 switch (via->rtvia_family) { 739 case AF_PACKET: 740 *via_table = NEIGH_LINK_TABLE; 741 break; 742 case AF_INET: 743 *via_table = NEIGH_ARP_TABLE; 744 if (alen != 4) 745 goto errout; 746 break; 747 case AF_INET6: 748 *via_table = NEIGH_ND_TABLE; 749 if (alen != 16) 750 goto errout; 751 break; 752 default: 753 /* Unsupported address family */ 754 goto errout; 755 } 756 757 memcpy(via_addr, via->rtvia_addr, alen); 758 *via_alen = alen; 759 err = 0; 760 761errout: 762 return err; 763} 764 765static int mpls_nh_build_from_cfg(struct mpls_route_config *cfg, 766 struct mpls_route *rt) 767{ 768 struct net *net = cfg->rc_nlinfo.nl_net; 769 struct mpls_nh *nh = rt->rt_nh; 770 int err; 771 int i; 772 773 if (!nh) 774 return -ENOMEM; 775 776 nh->nh_labels = cfg->rc_output_labels; 777 for (i = 0; i < nh->nh_labels; i++) 778 nh->nh_label[i] = cfg->rc_output_label[i]; 779 780 nh->nh_via_table = cfg->rc_via_table; 781 memcpy(__mpls_nh_via(rt, nh), cfg->rc_via, cfg->rc_via_alen); 782 nh->nh_via_alen = cfg->rc_via_alen; 783 784 err = mpls_nh_assign_dev(net, rt, nh, cfg->rc_ifindex); 785 if (err) 786 goto errout; 787 788 if (nh->nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)) 789 rt->rt_nhn_alive--; 790 791 return 0; 792 793errout: 794 return err; 795} 796 797static int mpls_nh_build(struct net *net, struct mpls_route *rt, 798 struct mpls_nh *nh, int oif, struct nlattr *via, 799 struct nlattr *newdst, u8 max_labels, 800 struct netlink_ext_ack *extack) 801{ 802 int err = -ENOMEM; 803 804 if (!nh) 805 goto errout; 806 807 if (newdst) { 808 err = nla_get_labels(newdst, max_labels, &nh->nh_labels, 809 nh->nh_label, extack); 810 if (err) 811 goto errout; 812 } 813 814 if (via) { 815 err = nla_get_via(via, &nh->nh_via_alen, &nh->nh_via_table, 816 __mpls_nh_via(rt, nh), extack); 817 if (err) 818 goto errout; 819 } else { 820 nh->nh_via_table = MPLS_NEIGH_TABLE_UNSPEC; 821 } 822 823 err = mpls_nh_assign_dev(net, rt, nh, oif); 824 if (err) 825 goto errout; 826 827 return 0; 828 829errout: 830 return err; 831} 832 833static u8 mpls_count_nexthops(struct rtnexthop *rtnh, int len, 834 u8 cfg_via_alen, u8 *max_via_alen, 835 u8 *max_labels) 836{ 837 int remaining = len; 838 u8 nhs = 0; 839 840 *max_via_alen = 0; 841 *max_labels = 0; 842 843 while (rtnh_ok(rtnh, remaining)) { 844 struct nlattr *nla, *attrs = rtnh_attrs(rtnh); 845 int attrlen; 846 u8 n_labels = 0; 847 848 attrlen = rtnh_attrlen(rtnh); 849 nla = nla_find(attrs, attrlen, RTA_VIA); 850 if (nla && nla_len(nla) >= 851 offsetof(struct rtvia, rtvia_addr)) { 852 int via_alen = nla_len(nla) - 853 offsetof(struct rtvia, rtvia_addr); 854 855 if (via_alen <= MAX_VIA_ALEN) 856 *max_via_alen = max_t(u16, *max_via_alen, 857 via_alen); 858 } 859 860 nla = nla_find(attrs, attrlen, RTA_NEWDST); 861 if (nla && 862 nla_get_labels(nla, MAX_NEW_LABELS, &n_labels, 863 NULL, NULL) != 0) 864 return 0; 865 866 *max_labels = max_t(u8, *max_labels, n_labels); 867 868 /* number of nexthops is tracked by a u8. 869 * Check for overflow. 870 */ 871 if (nhs == 255) 872 return 0; 873 nhs++; 874 875 rtnh = rtnh_next(rtnh, &remaining); 876 } 877 878 /* leftover implies invalid nexthop configuration, discard it */ 879 return remaining > 0 ? 0 : nhs; 880} 881 882static int mpls_nh_build_multi(struct mpls_route_config *cfg, 883 struct mpls_route *rt, u8 max_labels, 884 struct netlink_ext_ack *extack) 885{ 886 struct rtnexthop *rtnh = cfg->rc_mp; 887 struct nlattr *nla_via, *nla_newdst; 888 int remaining = cfg->rc_mp_len; 889 int err = 0; 890 u8 nhs = 0; 891 892 change_nexthops(rt) { 893 int attrlen; 894 895 nla_via = NULL; 896 nla_newdst = NULL; 897 898 err = -EINVAL; 899 if (!rtnh_ok(rtnh, remaining)) 900 goto errout; 901 902 /* neither weighted multipath nor any flags 903 * are supported 904 */ 905 if (rtnh->rtnh_hops || rtnh->rtnh_flags) 906 goto errout; 907 908 attrlen = rtnh_attrlen(rtnh); 909 if (attrlen > 0) { 910 struct nlattr *attrs = rtnh_attrs(rtnh); 911 912 nla_via = nla_find(attrs, attrlen, RTA_VIA); 913 nla_newdst = nla_find(attrs, attrlen, RTA_NEWDST); 914 } 915 916 err = mpls_nh_build(cfg->rc_nlinfo.nl_net, rt, nh, 917 rtnh->rtnh_ifindex, nla_via, nla_newdst, 918 max_labels, extack); 919 if (err) 920 goto errout; 921 922 if (nh->nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)) 923 rt->rt_nhn_alive--; 924 925 rtnh = rtnh_next(rtnh, &remaining); 926 nhs++; 927 } endfor_nexthops(rt); 928 929 rt->rt_nhn = nhs; 930 931 return 0; 932 933errout: 934 return err; 935} 936 937static bool mpls_label_ok(struct net *net, unsigned int *index, 938 struct netlink_ext_ack *extack) 939{ 940 bool is_ok = true; 941 942 /* Reserved labels may not be set */ 943 if (*index < MPLS_LABEL_FIRST_UNRESERVED) { 944 NL_SET_ERR_MSG(extack, 945 "Invalid label - must be MPLS_LABEL_FIRST_UNRESERVED or higher"); 946 is_ok = false; 947 } 948 949 /* The full 20 bit range may not be supported. */ 950 if (is_ok && *index >= net->mpls.platform_labels) { 951 NL_SET_ERR_MSG(extack, 952 "Label >= configured maximum in platform_labels"); 953 is_ok = false; 954 } 955 956 *index = array_index_nospec(*index, net->mpls.platform_labels); 957 return is_ok; 958} 959 960static int mpls_route_add(struct mpls_route_config *cfg, 961 struct netlink_ext_ack *extack) 962{ 963 struct mpls_route __rcu **platform_label; 964 struct net *net = cfg->rc_nlinfo.nl_net; 965 struct mpls_route *rt, *old; 966 int err = -EINVAL; 967 u8 max_via_alen; 968 unsigned index; 969 u8 max_labels; 970 u8 nhs; 971 972 index = cfg->rc_label; 973 974 /* If a label was not specified during insert pick one */ 975 if ((index == LABEL_NOT_SPECIFIED) && 976 (cfg->rc_nlflags & NLM_F_CREATE)) { 977 index = find_free_label(net); 978 } 979 980 if (!mpls_label_ok(net, &index, extack)) 981 goto errout; 982 983 /* Append makes no sense with mpls */ 984 err = -EOPNOTSUPP; 985 if (cfg->rc_nlflags & NLM_F_APPEND) { 986 NL_SET_ERR_MSG(extack, "MPLS does not support route append"); 987 goto errout; 988 } 989 990 err = -EEXIST; 991 platform_label = rtnl_dereference(net->mpls.platform_label); 992 old = rtnl_dereference(platform_label[index]); 993 if ((cfg->rc_nlflags & NLM_F_EXCL) && old) 994 goto errout; 995 996 err = -EEXIST; 997 if (!(cfg->rc_nlflags & NLM_F_REPLACE) && old) 998 goto errout; 999 1000 err = -ENOENT; 1001 if (!(cfg->rc_nlflags & NLM_F_CREATE) && !old) 1002 goto errout; 1003 1004 err = -EINVAL; 1005 if (cfg->rc_mp) { 1006 nhs = mpls_count_nexthops(cfg->rc_mp, cfg->rc_mp_len, 1007 cfg->rc_via_alen, &max_via_alen, 1008 &max_labels); 1009 } else { 1010 max_via_alen = cfg->rc_via_alen; 1011 max_labels = cfg->rc_output_labels; 1012 nhs = 1; 1013 } 1014 1015 if (nhs == 0) { 1016 NL_SET_ERR_MSG(extack, "Route does not contain a nexthop"); 1017 goto errout; 1018 } 1019 1020 err = -ENOMEM; 1021 rt = mpls_rt_alloc(nhs, max_via_alen, max_labels); 1022 if (IS_ERR(rt)) { 1023 err = PTR_ERR(rt); 1024 goto errout; 1025 } 1026 1027 rt->rt_protocol = cfg->rc_protocol; 1028 rt->rt_payload_type = cfg->rc_payload_type; 1029 rt->rt_ttl_propagate = cfg->rc_ttl_propagate; 1030 1031 if (cfg->rc_mp) 1032 err = mpls_nh_build_multi(cfg, rt, max_labels, extack); 1033 else 1034 err = mpls_nh_build_from_cfg(cfg, rt); 1035 if (err) 1036 goto freert; 1037 1038 mpls_route_update(net, index, rt, &cfg->rc_nlinfo); 1039 1040 return 0; 1041 1042freert: 1043 mpls_rt_free(rt); 1044errout: 1045 return err; 1046} 1047 1048static int mpls_route_del(struct mpls_route_config *cfg, 1049 struct netlink_ext_ack *extack) 1050{ 1051 struct net *net = cfg->rc_nlinfo.nl_net; 1052 unsigned index; 1053 int err = -EINVAL; 1054 1055 index = cfg->rc_label; 1056 1057 if (!mpls_label_ok(net, &index, extack)) 1058 goto errout; 1059 1060 mpls_route_update(net, index, NULL, &cfg->rc_nlinfo); 1061 1062 err = 0; 1063errout: 1064 return err; 1065} 1066 1067static void mpls_get_stats(struct mpls_dev *mdev, 1068 struct mpls_link_stats *stats) 1069{ 1070 struct mpls_pcpu_stats *p; 1071 int i; 1072 1073 memset(stats, 0, sizeof(*stats)); 1074 1075 for_each_possible_cpu(i) { 1076 struct mpls_link_stats local; 1077 unsigned int start; 1078 1079 p = per_cpu_ptr(mdev->stats, i); 1080 do { 1081 start = u64_stats_fetch_begin_irq(&p->syncp); 1082 local = p->stats; 1083 } while (u64_stats_fetch_retry_irq(&p->syncp, start)); 1084 1085 stats->rx_packets += local.rx_packets; 1086 stats->rx_bytes += local.rx_bytes; 1087 stats->tx_packets += local.tx_packets; 1088 stats->tx_bytes += local.tx_bytes; 1089 stats->rx_errors += local.rx_errors; 1090 stats->tx_errors += local.tx_errors; 1091 stats->rx_dropped += local.rx_dropped; 1092 stats->tx_dropped += local.tx_dropped; 1093 stats->rx_noroute += local.rx_noroute; 1094 } 1095} 1096 1097static int mpls_fill_stats_af(struct sk_buff *skb, 1098 const struct net_device *dev) 1099{ 1100 struct mpls_link_stats *stats; 1101 struct mpls_dev *mdev; 1102 struct nlattr *nla; 1103 1104 mdev = mpls_dev_get(dev); 1105 if (!mdev) 1106 return -ENODATA; 1107 1108 nla = nla_reserve_64bit(skb, MPLS_STATS_LINK, 1109 sizeof(struct mpls_link_stats), 1110 MPLS_STATS_UNSPEC); 1111 if (!nla) 1112 return -EMSGSIZE; 1113 1114 stats = nla_data(nla); 1115 mpls_get_stats(mdev, stats); 1116 1117 return 0; 1118} 1119 1120static size_t mpls_get_stats_af_size(const struct net_device *dev) 1121{ 1122 struct mpls_dev *mdev; 1123 1124 mdev = mpls_dev_get(dev); 1125 if (!mdev) 1126 return 0; 1127 1128 return nla_total_size_64bit(sizeof(struct mpls_link_stats)); 1129} 1130 1131static int mpls_netconf_fill_devconf(struct sk_buff *skb, struct mpls_dev *mdev, 1132 u32 portid, u32 seq, int event, 1133 unsigned int flags, int type) 1134{ 1135 struct nlmsghdr *nlh; 1136 struct netconfmsg *ncm; 1137 bool all = false; 1138 1139 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 1140 flags); 1141 if (!nlh) 1142 return -EMSGSIZE; 1143 1144 if (type == NETCONFA_ALL) 1145 all = true; 1146 1147 ncm = nlmsg_data(nlh); 1148 ncm->ncm_family = AF_MPLS; 1149 1150 if (nla_put_s32(skb, NETCONFA_IFINDEX, mdev->dev->ifindex) < 0) 1151 goto nla_put_failure; 1152 1153 if ((all || type == NETCONFA_INPUT) && 1154 nla_put_s32(skb, NETCONFA_INPUT, 1155 mdev->input_enabled) < 0) 1156 goto nla_put_failure; 1157 1158 nlmsg_end(skb, nlh); 1159 return 0; 1160 1161nla_put_failure: 1162 nlmsg_cancel(skb, nlh); 1163 return -EMSGSIZE; 1164} 1165 1166static int mpls_netconf_msgsize_devconf(int type) 1167{ 1168 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 1169 + nla_total_size(4); /* NETCONFA_IFINDEX */ 1170 bool all = false; 1171 1172 if (type == NETCONFA_ALL) 1173 all = true; 1174 1175 if (all || type == NETCONFA_INPUT) 1176 size += nla_total_size(4); 1177 1178 return size; 1179} 1180 1181static void mpls_netconf_notify_devconf(struct net *net, int event, 1182 int type, struct mpls_dev *mdev) 1183{ 1184 struct sk_buff *skb; 1185 int err = -ENOBUFS; 1186 1187 skb = nlmsg_new(mpls_netconf_msgsize_devconf(type), GFP_KERNEL); 1188 if (!skb) 1189 goto errout; 1190 1191 err = mpls_netconf_fill_devconf(skb, mdev, 0, 0, event, 0, type); 1192 if (err < 0) { 1193 /* -EMSGSIZE implies BUG in mpls_netconf_msgsize_devconf() */ 1194 WARN_ON(err == -EMSGSIZE); 1195 kfree_skb(skb); 1196 goto errout; 1197 } 1198 1199 rtnl_notify(skb, net, 0, RTNLGRP_MPLS_NETCONF, NULL, GFP_KERNEL); 1200 return; 1201errout: 1202 if (err < 0) 1203 rtnl_set_sk_err(net, RTNLGRP_MPLS_NETCONF, err); 1204} 1205 1206static const struct nla_policy devconf_mpls_policy[NETCONFA_MAX + 1] = { 1207 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 1208}; 1209 1210static int mpls_netconf_valid_get_req(struct sk_buff *skb, 1211 const struct nlmsghdr *nlh, 1212 struct nlattr **tb, 1213 struct netlink_ext_ack *extack) 1214{ 1215 int i, err; 1216 1217 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) { 1218 NL_SET_ERR_MSG_MOD(extack, 1219 "Invalid header for netconf get request"); 1220 return -EINVAL; 1221 } 1222 1223 if (!netlink_strict_get_check(skb)) 1224 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg), 1225 tb, NETCONFA_MAX, 1226 devconf_mpls_policy, extack); 1227 1228 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg), 1229 tb, NETCONFA_MAX, 1230 devconf_mpls_policy, extack); 1231 if (err) 1232 return err; 1233 1234 for (i = 0; i <= NETCONFA_MAX; i++) { 1235 if (!tb[i]) 1236 continue; 1237 1238 switch (i) { 1239 case NETCONFA_IFINDEX: 1240 break; 1241 default: 1242 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request"); 1243 return -EINVAL; 1244 } 1245 } 1246 1247 return 0; 1248} 1249 1250static int mpls_netconf_get_devconf(struct sk_buff *in_skb, 1251 struct nlmsghdr *nlh, 1252 struct netlink_ext_ack *extack) 1253{ 1254 struct net *net = sock_net(in_skb->sk); 1255 struct nlattr *tb[NETCONFA_MAX + 1]; 1256 struct net_device *dev; 1257 struct mpls_dev *mdev; 1258 struct sk_buff *skb; 1259 int ifindex; 1260 int err; 1261 1262 err = mpls_netconf_valid_get_req(in_skb, nlh, tb, extack); 1263 if (err < 0) 1264 goto errout; 1265 1266 err = -EINVAL; 1267 if (!tb[NETCONFA_IFINDEX]) 1268 goto errout; 1269 1270 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 1271 dev = __dev_get_by_index(net, ifindex); 1272 if (!dev) 1273 goto errout; 1274 1275 mdev = mpls_dev_get(dev); 1276 if (!mdev) 1277 goto errout; 1278 1279 err = -ENOBUFS; 1280 skb = nlmsg_new(mpls_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL); 1281 if (!skb) 1282 goto errout; 1283 1284 err = mpls_netconf_fill_devconf(skb, mdev, 1285 NETLINK_CB(in_skb).portid, 1286 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 1287 NETCONFA_ALL); 1288 if (err < 0) { 1289 /* -EMSGSIZE implies BUG in mpls_netconf_msgsize_devconf() */ 1290 WARN_ON(err == -EMSGSIZE); 1291 kfree_skb(skb); 1292 goto errout; 1293 } 1294 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 1295errout: 1296 return err; 1297} 1298 1299static int mpls_netconf_dump_devconf(struct sk_buff *skb, 1300 struct netlink_callback *cb) 1301{ 1302 const struct nlmsghdr *nlh = cb->nlh; 1303 struct net *net = sock_net(skb->sk); 1304 struct hlist_head *head; 1305 struct net_device *dev; 1306 struct mpls_dev *mdev; 1307 int idx, s_idx; 1308 int h, s_h; 1309 1310 if (cb->strict_check) { 1311 struct netlink_ext_ack *extack = cb->extack; 1312 struct netconfmsg *ncm; 1313 1314 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) { 1315 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request"); 1316 return -EINVAL; 1317 } 1318 1319 if (nlmsg_attrlen(nlh, sizeof(*ncm))) { 1320 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request"); 1321 return -EINVAL; 1322 } 1323 } 1324 1325 s_h = cb->args[0]; 1326 s_idx = idx = cb->args[1]; 1327 1328 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 1329 idx = 0; 1330 head = &net->dev_index_head[h]; 1331 rcu_read_lock(); 1332 cb->seq = net->dev_base_seq; 1333 hlist_for_each_entry_rcu(dev, head, index_hlist) { 1334 if (idx < s_idx) 1335 goto cont; 1336 mdev = mpls_dev_get(dev); 1337 if (!mdev) 1338 goto cont; 1339 if (mpls_netconf_fill_devconf(skb, mdev, 1340 NETLINK_CB(cb->skb).portid, 1341 nlh->nlmsg_seq, 1342 RTM_NEWNETCONF, 1343 NLM_F_MULTI, 1344 NETCONFA_ALL) < 0) { 1345 rcu_read_unlock(); 1346 goto done; 1347 } 1348 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 1349cont: 1350 idx++; 1351 } 1352 rcu_read_unlock(); 1353 } 1354done: 1355 cb->args[0] = h; 1356 cb->args[1] = idx; 1357 1358 return skb->len; 1359} 1360 1361#define MPLS_PERDEV_SYSCTL_OFFSET(field) \ 1362 (&((struct mpls_dev *)0)->field) 1363 1364static int mpls_conf_proc(struct ctl_table *ctl, int write, 1365 void *buffer, size_t *lenp, loff_t *ppos) 1366{ 1367 int oval = *(int *)ctl->data; 1368 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 1369 1370 if (write) { 1371 struct mpls_dev *mdev = ctl->extra1; 1372 int i = (int *)ctl->data - (int *)mdev; 1373 struct net *net = ctl->extra2; 1374 int val = *(int *)ctl->data; 1375 1376 if (i == offsetof(struct mpls_dev, input_enabled) && 1377 val != oval) { 1378 mpls_netconf_notify_devconf(net, RTM_NEWNETCONF, 1379 NETCONFA_INPUT, mdev); 1380 } 1381 } 1382 1383 return ret; 1384} 1385 1386static const struct ctl_table mpls_dev_table[] = { 1387 { 1388 .procname = "input", 1389 .maxlen = sizeof(int), 1390 .mode = 0644, 1391 .proc_handler = mpls_conf_proc, 1392 .data = MPLS_PERDEV_SYSCTL_OFFSET(input_enabled), 1393 }, 1394 { } 1395}; 1396 1397static int mpls_dev_sysctl_register(struct net_device *dev, 1398 struct mpls_dev *mdev) 1399{ 1400 char path[sizeof("net/mpls/conf/") + IFNAMSIZ]; 1401 struct net *net = dev_net(dev); 1402 struct ctl_table *table; 1403 int i; 1404 1405 table = kmemdup(&mpls_dev_table, sizeof(mpls_dev_table), GFP_KERNEL); 1406 if (!table) 1407 goto out; 1408 1409 /* Table data contains only offsets relative to the base of 1410 * the mdev at this point, so make them absolute. 1411 */ 1412 for (i = 0; i < ARRAY_SIZE(mpls_dev_table); i++) { 1413 table[i].data = (char *)mdev + (uintptr_t)table[i].data; 1414 table[i].extra1 = mdev; 1415 table[i].extra2 = net; 1416 } 1417 1418 snprintf(path, sizeof(path), "net/mpls/conf/%s", dev->name); 1419 1420 mdev->sysctl = register_net_sysctl(net, path, table); 1421 if (!mdev->sysctl) 1422 goto free; 1423 1424 mpls_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, mdev); 1425 return 0; 1426 1427free: 1428 kfree(table); 1429out: 1430 mdev->sysctl = NULL; 1431 return -ENOBUFS; 1432} 1433 1434static void mpls_dev_sysctl_unregister(struct net_device *dev, 1435 struct mpls_dev *mdev) 1436{ 1437 struct net *net = dev_net(dev); 1438 struct ctl_table *table; 1439 1440 if (!mdev->sysctl) 1441 return; 1442 1443 table = mdev->sysctl->ctl_table_arg; 1444 unregister_net_sysctl_table(mdev->sysctl); 1445 kfree(table); 1446 1447 mpls_netconf_notify_devconf(net, RTM_DELNETCONF, 0, mdev); 1448} 1449 1450static struct mpls_dev *mpls_add_dev(struct net_device *dev) 1451{ 1452 struct mpls_dev *mdev; 1453 int err = -ENOMEM; 1454 int i; 1455 1456 ASSERT_RTNL(); 1457 1458 mdev = kzalloc(sizeof(*mdev), GFP_KERNEL); 1459 if (!mdev) 1460 return ERR_PTR(err); 1461 1462 mdev->stats = alloc_percpu(struct mpls_pcpu_stats); 1463 if (!mdev->stats) 1464 goto free; 1465 1466 for_each_possible_cpu(i) { 1467 struct mpls_pcpu_stats *mpls_stats; 1468 1469 mpls_stats = per_cpu_ptr(mdev->stats, i); 1470 u64_stats_init(&mpls_stats->syncp); 1471 } 1472 1473 mdev->dev = dev; 1474 1475 err = mpls_dev_sysctl_register(dev, mdev); 1476 if (err) 1477 goto free; 1478 1479 rcu_assign_pointer(dev->mpls_ptr, mdev); 1480 1481 return mdev; 1482 1483free: 1484 free_percpu(mdev->stats); 1485 kfree(mdev); 1486 return ERR_PTR(err); 1487} 1488 1489static void mpls_dev_destroy_rcu(struct rcu_head *head) 1490{ 1491 struct mpls_dev *mdev = container_of(head, struct mpls_dev, rcu); 1492 1493 free_percpu(mdev->stats); 1494 kfree(mdev); 1495} 1496 1497static int mpls_ifdown(struct net_device *dev, int event) 1498{ 1499 struct mpls_route __rcu **platform_label; 1500 struct net *net = dev_net(dev); 1501 unsigned index; 1502 1503 platform_label = rtnl_dereference(net->mpls.platform_label); 1504 for (index = 0; index < net->mpls.platform_labels; index++) { 1505 struct mpls_route *rt = rtnl_dereference(platform_label[index]); 1506 bool nh_del = false; 1507 u8 alive = 0; 1508 1509 if (!rt) 1510 continue; 1511 1512 if (event == NETDEV_UNREGISTER) { 1513 u8 deleted = 0; 1514 1515 for_nexthops(rt) { 1516 struct net_device *nh_dev = 1517 rtnl_dereference(nh->nh_dev); 1518 1519 if (!nh_dev || nh_dev == dev) 1520 deleted++; 1521 if (nh_dev == dev) 1522 nh_del = true; 1523 } endfor_nexthops(rt); 1524 1525 /* if there are no more nexthops, delete the route */ 1526 if (deleted == rt->rt_nhn) { 1527 mpls_route_update(net, index, NULL, NULL); 1528 continue; 1529 } 1530 1531 if (nh_del) { 1532 size_t size = sizeof(*rt) + rt->rt_nhn * 1533 rt->rt_nh_size; 1534 struct mpls_route *orig = rt; 1535 1536 rt = kmalloc(size, GFP_KERNEL); 1537 if (!rt) 1538 return -ENOMEM; 1539 memcpy(rt, orig, size); 1540 } 1541 } 1542 1543 change_nexthops(rt) { 1544 unsigned int nh_flags = nh->nh_flags; 1545 1546 if (rtnl_dereference(nh->nh_dev) != dev) 1547 goto next; 1548 1549 switch (event) { 1550 case NETDEV_DOWN: 1551 case NETDEV_UNREGISTER: 1552 nh_flags |= RTNH_F_DEAD; 1553 fallthrough; 1554 case NETDEV_CHANGE: 1555 nh_flags |= RTNH_F_LINKDOWN; 1556 break; 1557 } 1558 if (event == NETDEV_UNREGISTER) 1559 RCU_INIT_POINTER(nh->nh_dev, NULL); 1560 1561 if (nh->nh_flags != nh_flags) 1562 WRITE_ONCE(nh->nh_flags, nh_flags); 1563next: 1564 if (!(nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN))) 1565 alive++; 1566 } endfor_nexthops(rt); 1567 1568 WRITE_ONCE(rt->rt_nhn_alive, alive); 1569 1570 if (nh_del) 1571 mpls_route_update(net, index, rt, NULL); 1572 } 1573 1574 return 0; 1575} 1576 1577static void mpls_ifup(struct net_device *dev, unsigned int flags) 1578{ 1579 struct mpls_route __rcu **platform_label; 1580 struct net *net = dev_net(dev); 1581 unsigned index; 1582 u8 alive; 1583 1584 platform_label = rtnl_dereference(net->mpls.platform_label); 1585 for (index = 0; index < net->mpls.platform_labels; index++) { 1586 struct mpls_route *rt = rtnl_dereference(platform_label[index]); 1587 1588 if (!rt) 1589 continue; 1590 1591 alive = 0; 1592 change_nexthops(rt) { 1593 unsigned int nh_flags = nh->nh_flags; 1594 struct net_device *nh_dev = 1595 rtnl_dereference(nh->nh_dev); 1596 1597 if (!(nh_flags & flags)) { 1598 alive++; 1599 continue; 1600 } 1601 if (nh_dev != dev) 1602 continue; 1603 alive++; 1604 nh_flags &= ~flags; 1605 WRITE_ONCE(nh->nh_flags, nh_flags); 1606 } endfor_nexthops(rt); 1607 1608 WRITE_ONCE(rt->rt_nhn_alive, alive); 1609 } 1610} 1611 1612static int mpls_dev_notify(struct notifier_block *this, unsigned long event, 1613 void *ptr) 1614{ 1615 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1616 struct mpls_dev *mdev; 1617 unsigned int flags; 1618 1619 if (event == NETDEV_REGISTER) { 1620 mdev = mpls_add_dev(dev); 1621 if (IS_ERR(mdev)) 1622 return notifier_from_errno(PTR_ERR(mdev)); 1623 1624 return NOTIFY_OK; 1625 } 1626 1627 mdev = mpls_dev_get(dev); 1628 if (!mdev) 1629 return NOTIFY_OK; 1630 1631 switch (event) { 1632 int err; 1633 1634 case NETDEV_DOWN: 1635 err = mpls_ifdown(dev, event); 1636 if (err) 1637 return notifier_from_errno(err); 1638 break; 1639 case NETDEV_UP: 1640 flags = dev_get_flags(dev); 1641 if (flags & (IFF_RUNNING | IFF_LOWER_UP)) 1642 mpls_ifup(dev, RTNH_F_DEAD | RTNH_F_LINKDOWN); 1643 else 1644 mpls_ifup(dev, RTNH_F_DEAD); 1645 break; 1646 case NETDEV_CHANGE: 1647 flags = dev_get_flags(dev); 1648 if (flags & (IFF_RUNNING | IFF_LOWER_UP)) { 1649 mpls_ifup(dev, RTNH_F_DEAD | RTNH_F_LINKDOWN); 1650 } else { 1651 err = mpls_ifdown(dev, event); 1652 if (err) 1653 return notifier_from_errno(err); 1654 } 1655 break; 1656 case NETDEV_UNREGISTER: 1657 err = mpls_ifdown(dev, event); 1658 if (err) 1659 return notifier_from_errno(err); 1660 mdev = mpls_dev_get(dev); 1661 if (mdev) { 1662 mpls_dev_sysctl_unregister(dev, mdev); 1663 RCU_INIT_POINTER(dev->mpls_ptr, NULL); 1664 call_rcu(&mdev->rcu, mpls_dev_destroy_rcu); 1665 } 1666 break; 1667 case NETDEV_CHANGENAME: 1668 mdev = mpls_dev_get(dev); 1669 if (mdev) { 1670 mpls_dev_sysctl_unregister(dev, mdev); 1671 err = mpls_dev_sysctl_register(dev, mdev); 1672 if (err) 1673 return notifier_from_errno(err); 1674 } 1675 break; 1676 } 1677 return NOTIFY_OK; 1678} 1679 1680static struct notifier_block mpls_dev_notifier = { 1681 .notifier_call = mpls_dev_notify, 1682}; 1683 1684static int nla_put_via(struct sk_buff *skb, 1685 u8 table, const void *addr, int alen) 1686{ 1687 static const int table_to_family[NEIGH_NR_TABLES + 1] = { 1688 AF_INET, AF_INET6, AF_DECnet, AF_PACKET, 1689 }; 1690 struct nlattr *nla; 1691 struct rtvia *via; 1692 int family = AF_UNSPEC; 1693 1694 nla = nla_reserve(skb, RTA_VIA, alen + 2); 1695 if (!nla) 1696 return -EMSGSIZE; 1697 1698 if (table <= NEIGH_NR_TABLES) 1699 family = table_to_family[table]; 1700 1701 via = nla_data(nla); 1702 via->rtvia_family = family; 1703 memcpy(via->rtvia_addr, addr, alen); 1704 return 0; 1705} 1706 1707int nla_put_labels(struct sk_buff *skb, int attrtype, 1708 u8 labels, const u32 label[]) 1709{ 1710 struct nlattr *nla; 1711 struct mpls_shim_hdr *nla_label; 1712 bool bos; 1713 int i; 1714 nla = nla_reserve(skb, attrtype, labels*4); 1715 if (!nla) 1716 return -EMSGSIZE; 1717 1718 nla_label = nla_data(nla); 1719 bos = true; 1720 for (i = labels - 1; i >= 0; i--) { 1721 nla_label[i] = mpls_entry_encode(label[i], 0, 0, bos); 1722 bos = false; 1723 } 1724 1725 return 0; 1726} 1727EXPORT_SYMBOL_GPL(nla_put_labels); 1728 1729int nla_get_labels(const struct nlattr *nla, u8 max_labels, u8 *labels, 1730 u32 label[], struct netlink_ext_ack *extack) 1731{ 1732 unsigned len = nla_len(nla); 1733 struct mpls_shim_hdr *nla_label; 1734 u8 nla_labels; 1735 bool bos; 1736 int i; 1737 1738 /* len needs to be an even multiple of 4 (the label size). Number 1739 * of labels is a u8 so check for overflow. 1740 */ 1741 if (len & 3 || len / 4 > 255) { 1742 NL_SET_ERR_MSG_ATTR(extack, nla, 1743 "Invalid length for labels attribute"); 1744 return -EINVAL; 1745 } 1746 1747 /* Limit the number of new labels allowed */ 1748 nla_labels = len/4; 1749 if (nla_labels > max_labels) { 1750 NL_SET_ERR_MSG(extack, "Too many labels"); 1751 return -EINVAL; 1752 } 1753 1754 /* when label == NULL, caller wants number of labels */ 1755 if (!label) 1756 goto out; 1757 1758 nla_label = nla_data(nla); 1759 bos = true; 1760 for (i = nla_labels - 1; i >= 0; i--, bos = false) { 1761 struct mpls_entry_decoded dec; 1762 dec = mpls_entry_decode(nla_label + i); 1763 1764 /* Ensure the bottom of stack flag is properly set 1765 * and ttl and tc are both clear. 1766 */ 1767 if (dec.ttl) { 1768 NL_SET_ERR_MSG_ATTR(extack, nla, 1769 "TTL in label must be 0"); 1770 return -EINVAL; 1771 } 1772 1773 if (dec.tc) { 1774 NL_SET_ERR_MSG_ATTR(extack, nla, 1775 "Traffic class in label must be 0"); 1776 return -EINVAL; 1777 } 1778 1779 if (dec.bos != bos) { 1780 NL_SET_BAD_ATTR(extack, nla); 1781 if (bos) { 1782 NL_SET_ERR_MSG(extack, 1783 "BOS bit must be set in first label"); 1784 } else { 1785 NL_SET_ERR_MSG(extack, 1786 "BOS bit can only be set in first label"); 1787 } 1788 return -EINVAL; 1789 } 1790 1791 switch (dec.label) { 1792 case MPLS_LABEL_IMPLNULL: 1793 /* RFC3032: This is a label that an LSR may 1794 * assign and distribute, but which never 1795 * actually appears in the encapsulation. 1796 */ 1797 NL_SET_ERR_MSG_ATTR(extack, nla, 1798 "Implicit NULL Label (3) can not be used in encapsulation"); 1799 return -EINVAL; 1800 } 1801 1802 label[i] = dec.label; 1803 } 1804out: 1805 *labels = nla_labels; 1806 return 0; 1807} 1808EXPORT_SYMBOL_GPL(nla_get_labels); 1809 1810static int rtm_to_route_config(struct sk_buff *skb, 1811 struct nlmsghdr *nlh, 1812 struct mpls_route_config *cfg, 1813 struct netlink_ext_ack *extack) 1814{ 1815 struct rtmsg *rtm; 1816 struct nlattr *tb[RTA_MAX+1]; 1817 int index; 1818 int err; 1819 1820 err = nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX, 1821 rtm_mpls_policy, extack); 1822 if (err < 0) 1823 goto errout; 1824 1825 err = -EINVAL; 1826 rtm = nlmsg_data(nlh); 1827 1828 if (rtm->rtm_family != AF_MPLS) { 1829 NL_SET_ERR_MSG(extack, "Invalid address family in rtmsg"); 1830 goto errout; 1831 } 1832 if (rtm->rtm_dst_len != 20) { 1833 NL_SET_ERR_MSG(extack, "rtm_dst_len must be 20 for MPLS"); 1834 goto errout; 1835 } 1836 if (rtm->rtm_src_len != 0) { 1837 NL_SET_ERR_MSG(extack, "rtm_src_len must be 0 for MPLS"); 1838 goto errout; 1839 } 1840 if (rtm->rtm_tos != 0) { 1841 NL_SET_ERR_MSG(extack, "rtm_tos must be 0 for MPLS"); 1842 goto errout; 1843 } 1844 if (rtm->rtm_table != RT_TABLE_MAIN) { 1845 NL_SET_ERR_MSG(extack, 1846 "MPLS only supports the main route table"); 1847 goto errout; 1848 } 1849 /* Any value is acceptable for rtm_protocol */ 1850 1851 /* As mpls uses destination specific addresses 1852 * (or source specific address in the case of multicast) 1853 * all addresses have universal scope. 1854 */ 1855 if (rtm->rtm_scope != RT_SCOPE_UNIVERSE) { 1856 NL_SET_ERR_MSG(extack, 1857 "Invalid route scope - MPLS only supports UNIVERSE"); 1858 goto errout; 1859 } 1860 if (rtm->rtm_type != RTN_UNICAST) { 1861 NL_SET_ERR_MSG(extack, 1862 "Invalid route type - MPLS only supports UNICAST"); 1863 goto errout; 1864 } 1865 if (rtm->rtm_flags != 0) { 1866 NL_SET_ERR_MSG(extack, "rtm_flags must be 0 for MPLS"); 1867 goto errout; 1868 } 1869 1870 cfg->rc_label = LABEL_NOT_SPECIFIED; 1871 cfg->rc_protocol = rtm->rtm_protocol; 1872 cfg->rc_via_table = MPLS_NEIGH_TABLE_UNSPEC; 1873 cfg->rc_ttl_propagate = MPLS_TTL_PROP_DEFAULT; 1874 cfg->rc_nlflags = nlh->nlmsg_flags; 1875 cfg->rc_nlinfo.portid = NETLINK_CB(skb).portid; 1876 cfg->rc_nlinfo.nlh = nlh; 1877 cfg->rc_nlinfo.nl_net = sock_net(skb->sk); 1878 1879 for (index = 0; index <= RTA_MAX; index++) { 1880 struct nlattr *nla = tb[index]; 1881 if (!nla) 1882 continue; 1883 1884 switch (index) { 1885 case RTA_OIF: 1886 cfg->rc_ifindex = nla_get_u32(nla); 1887 break; 1888 case RTA_NEWDST: 1889 if (nla_get_labels(nla, MAX_NEW_LABELS, 1890 &cfg->rc_output_labels, 1891 cfg->rc_output_label, extack)) 1892 goto errout; 1893 break; 1894 case RTA_DST: 1895 { 1896 u8 label_count; 1897 if (nla_get_labels(nla, 1, &label_count, 1898 &cfg->rc_label, extack)) 1899 goto errout; 1900 1901 if (!mpls_label_ok(cfg->rc_nlinfo.nl_net, 1902 &cfg->rc_label, extack)) 1903 goto errout; 1904 break; 1905 } 1906 case RTA_GATEWAY: 1907 NL_SET_ERR_MSG(extack, "MPLS does not support RTA_GATEWAY attribute"); 1908 goto errout; 1909 case RTA_VIA: 1910 { 1911 if (nla_get_via(nla, &cfg->rc_via_alen, 1912 &cfg->rc_via_table, cfg->rc_via, 1913 extack)) 1914 goto errout; 1915 break; 1916 } 1917 case RTA_MULTIPATH: 1918 { 1919 cfg->rc_mp = nla_data(nla); 1920 cfg->rc_mp_len = nla_len(nla); 1921 break; 1922 } 1923 case RTA_TTL_PROPAGATE: 1924 { 1925 u8 ttl_propagate = nla_get_u8(nla); 1926 1927 if (ttl_propagate > 1) { 1928 NL_SET_ERR_MSG_ATTR(extack, nla, 1929 "RTA_TTL_PROPAGATE can only be 0 or 1"); 1930 goto errout; 1931 } 1932 cfg->rc_ttl_propagate = ttl_propagate ? 1933 MPLS_TTL_PROP_ENABLED : 1934 MPLS_TTL_PROP_DISABLED; 1935 break; 1936 } 1937 default: 1938 NL_SET_ERR_MSG_ATTR(extack, nla, "Unknown attribute"); 1939 /* Unsupported attribute */ 1940 goto errout; 1941 } 1942 } 1943 1944 err = 0; 1945errout: 1946 return err; 1947} 1948 1949static int mpls_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, 1950 struct netlink_ext_ack *extack) 1951{ 1952 struct mpls_route_config *cfg; 1953 int err; 1954 1955 cfg = kzalloc(sizeof(*cfg), GFP_KERNEL); 1956 if (!cfg) 1957 return -ENOMEM; 1958 1959 err = rtm_to_route_config(skb, nlh, cfg, extack); 1960 if (err < 0) 1961 goto out; 1962 1963 err = mpls_route_del(cfg, extack); 1964out: 1965 kfree(cfg); 1966 1967 return err; 1968} 1969 1970 1971static int mpls_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, 1972 struct netlink_ext_ack *extack) 1973{ 1974 struct mpls_route_config *cfg; 1975 int err; 1976 1977 cfg = kzalloc(sizeof(*cfg), GFP_KERNEL); 1978 if (!cfg) 1979 return -ENOMEM; 1980 1981 err = rtm_to_route_config(skb, nlh, cfg, extack); 1982 if (err < 0) 1983 goto out; 1984 1985 err = mpls_route_add(cfg, extack); 1986out: 1987 kfree(cfg); 1988 1989 return err; 1990} 1991 1992static int mpls_dump_route(struct sk_buff *skb, u32 portid, u32 seq, int event, 1993 u32 label, struct mpls_route *rt, int flags) 1994{ 1995 struct net_device *dev; 1996 struct nlmsghdr *nlh; 1997 struct rtmsg *rtm; 1998 1999 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*rtm), flags); 2000 if (nlh == NULL) 2001 return -EMSGSIZE; 2002 2003 rtm = nlmsg_data(nlh); 2004 rtm->rtm_family = AF_MPLS; 2005 rtm->rtm_dst_len = 20; 2006 rtm->rtm_src_len = 0; 2007 rtm->rtm_tos = 0; 2008 rtm->rtm_table = RT_TABLE_MAIN; 2009 rtm->rtm_protocol = rt->rt_protocol; 2010 rtm->rtm_scope = RT_SCOPE_UNIVERSE; 2011 rtm->rtm_type = RTN_UNICAST; 2012 rtm->rtm_flags = 0; 2013 2014 if (nla_put_labels(skb, RTA_DST, 1, &label)) 2015 goto nla_put_failure; 2016 2017 if (rt->rt_ttl_propagate != MPLS_TTL_PROP_DEFAULT) { 2018 bool ttl_propagate = 2019 rt->rt_ttl_propagate == MPLS_TTL_PROP_ENABLED; 2020 2021 if (nla_put_u8(skb, RTA_TTL_PROPAGATE, 2022 ttl_propagate)) 2023 goto nla_put_failure; 2024 } 2025 if (rt->rt_nhn == 1) { 2026 const struct mpls_nh *nh = rt->rt_nh; 2027 2028 if (nh->nh_labels && 2029 nla_put_labels(skb, RTA_NEWDST, nh->nh_labels, 2030 nh->nh_label)) 2031 goto nla_put_failure; 2032 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC && 2033 nla_put_via(skb, nh->nh_via_table, mpls_nh_via(rt, nh), 2034 nh->nh_via_alen)) 2035 goto nla_put_failure; 2036 dev = rtnl_dereference(nh->nh_dev); 2037 if (dev && nla_put_u32(skb, RTA_OIF, dev->ifindex)) 2038 goto nla_put_failure; 2039 if (nh->nh_flags & RTNH_F_LINKDOWN) 2040 rtm->rtm_flags |= RTNH_F_LINKDOWN; 2041 if (nh->nh_flags & RTNH_F_DEAD) 2042 rtm->rtm_flags |= RTNH_F_DEAD; 2043 } else { 2044 struct rtnexthop *rtnh; 2045 struct nlattr *mp; 2046 u8 linkdown = 0; 2047 u8 dead = 0; 2048 2049 mp = nla_nest_start_noflag(skb, RTA_MULTIPATH); 2050 if (!mp) 2051 goto nla_put_failure; 2052 2053 for_nexthops(rt) { 2054 dev = rtnl_dereference(nh->nh_dev); 2055 if (!dev) 2056 continue; 2057 2058 rtnh = nla_reserve_nohdr(skb, sizeof(*rtnh)); 2059 if (!rtnh) 2060 goto nla_put_failure; 2061 2062 rtnh->rtnh_ifindex = dev->ifindex; 2063 if (nh->nh_flags & RTNH_F_LINKDOWN) { 2064 rtnh->rtnh_flags |= RTNH_F_LINKDOWN; 2065 linkdown++; 2066 } 2067 if (nh->nh_flags & RTNH_F_DEAD) { 2068 rtnh->rtnh_flags |= RTNH_F_DEAD; 2069 dead++; 2070 } 2071 2072 if (nh->nh_labels && nla_put_labels(skb, RTA_NEWDST, 2073 nh->nh_labels, 2074 nh->nh_label)) 2075 goto nla_put_failure; 2076 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC && 2077 nla_put_via(skb, nh->nh_via_table, 2078 mpls_nh_via(rt, nh), 2079 nh->nh_via_alen)) 2080 goto nla_put_failure; 2081 2082 /* length of rtnetlink header + attributes */ 2083 rtnh->rtnh_len = nlmsg_get_pos(skb) - (void *)rtnh; 2084 } endfor_nexthops(rt); 2085 2086 if (linkdown == rt->rt_nhn) 2087 rtm->rtm_flags |= RTNH_F_LINKDOWN; 2088 if (dead == rt->rt_nhn) 2089 rtm->rtm_flags |= RTNH_F_DEAD; 2090 2091 nla_nest_end(skb, mp); 2092 } 2093 2094 nlmsg_end(skb, nlh); 2095 return 0; 2096 2097nla_put_failure: 2098 nlmsg_cancel(skb, nlh); 2099 return -EMSGSIZE; 2100} 2101 2102#if IS_ENABLED(CONFIG_INET) 2103static int mpls_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh, 2104 struct fib_dump_filter *filter, 2105 struct netlink_callback *cb) 2106{ 2107 return ip_valid_fib_dump_req(net, nlh, filter, cb); 2108} 2109#else 2110static int mpls_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh, 2111 struct fib_dump_filter *filter, 2112 struct netlink_callback *cb) 2113{ 2114 struct netlink_ext_ack *extack = cb->extack; 2115 struct nlattr *tb[RTA_MAX + 1]; 2116 struct rtmsg *rtm; 2117 int err, i; 2118 2119 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) { 2120 NL_SET_ERR_MSG_MOD(extack, "Invalid header for FIB dump request"); 2121 return -EINVAL; 2122 } 2123 2124 rtm = nlmsg_data(nlh); 2125 if (rtm->rtm_dst_len || rtm->rtm_src_len || rtm->rtm_tos || 2126 rtm->rtm_table || rtm->rtm_scope || rtm->rtm_type || 2127 rtm->rtm_flags) { 2128 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for FIB dump request"); 2129 return -EINVAL; 2130 } 2131 2132 if (rtm->rtm_protocol) { 2133 filter->protocol = rtm->rtm_protocol; 2134 filter->filter_set = 1; 2135 cb->answer_flags = NLM_F_DUMP_FILTERED; 2136 } 2137 2138 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX, 2139 rtm_mpls_policy, extack); 2140 if (err < 0) 2141 return err; 2142 2143 for (i = 0; i <= RTA_MAX; ++i) { 2144 int ifindex; 2145 2146 if (i == RTA_OIF) { 2147 ifindex = nla_get_u32(tb[i]); 2148 filter->dev = __dev_get_by_index(net, ifindex); 2149 if (!filter->dev) 2150 return -ENODEV; 2151 filter->filter_set = 1; 2152 } else if (tb[i]) { 2153 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request"); 2154 return -EINVAL; 2155 } 2156 } 2157 2158 return 0; 2159} 2160#endif 2161 2162static bool mpls_rt_uses_dev(struct mpls_route *rt, 2163 const struct net_device *dev) 2164{ 2165 struct net_device *nh_dev; 2166 2167 if (rt->rt_nhn == 1) { 2168 struct mpls_nh *nh = rt->rt_nh; 2169 2170 nh_dev = rtnl_dereference(nh->nh_dev); 2171 if (dev == nh_dev) 2172 return true; 2173 } else { 2174 for_nexthops(rt) { 2175 nh_dev = rtnl_dereference(nh->nh_dev); 2176 if (nh_dev == dev) 2177 return true; 2178 } endfor_nexthops(rt); 2179 } 2180 2181 return false; 2182} 2183 2184static int mpls_dump_routes(struct sk_buff *skb, struct netlink_callback *cb) 2185{ 2186 const struct nlmsghdr *nlh = cb->nlh; 2187 struct net *net = sock_net(skb->sk); 2188 struct mpls_route __rcu **platform_label; 2189 struct fib_dump_filter filter = {}; 2190 unsigned int flags = NLM_F_MULTI; 2191 size_t platform_labels; 2192 unsigned int index; 2193 2194 ASSERT_RTNL(); 2195 2196 if (cb->strict_check) { 2197 int err; 2198 2199 err = mpls_valid_fib_dump_req(net, nlh, &filter, cb); 2200 if (err < 0) 2201 return err; 2202 2203 /* for MPLS, there is only 1 table with fixed type and flags. 2204 * If either are set in the filter then return nothing. 2205 */ 2206 if ((filter.table_id && filter.table_id != RT_TABLE_MAIN) || 2207 (filter.rt_type && filter.rt_type != RTN_UNICAST) || 2208 filter.flags) 2209 return skb->len; 2210 } 2211 2212 index = cb->args[0]; 2213 if (index < MPLS_LABEL_FIRST_UNRESERVED) 2214 index = MPLS_LABEL_FIRST_UNRESERVED; 2215 2216 platform_label = rtnl_dereference(net->mpls.platform_label); 2217 platform_labels = net->mpls.platform_labels; 2218 2219 if (filter.filter_set) 2220 flags |= NLM_F_DUMP_FILTERED; 2221 2222 for (; index < platform_labels; index++) { 2223 struct mpls_route *rt; 2224 2225 rt = rtnl_dereference(platform_label[index]); 2226 if (!rt) 2227 continue; 2228 2229 if ((filter.dev && !mpls_rt_uses_dev(rt, filter.dev)) || 2230 (filter.protocol && rt->rt_protocol != filter.protocol)) 2231 continue; 2232 2233 if (mpls_dump_route(skb, NETLINK_CB(cb->skb).portid, 2234 cb->nlh->nlmsg_seq, RTM_NEWROUTE, 2235 index, rt, flags) < 0) 2236 break; 2237 } 2238 cb->args[0] = index; 2239 2240 return skb->len; 2241} 2242 2243static inline size_t lfib_nlmsg_size(struct mpls_route *rt) 2244{ 2245 size_t payload = 2246 NLMSG_ALIGN(sizeof(struct rtmsg)) 2247 + nla_total_size(4) /* RTA_DST */ 2248 + nla_total_size(1); /* RTA_TTL_PROPAGATE */ 2249 2250 if (rt->rt_nhn == 1) { 2251 struct mpls_nh *nh = rt->rt_nh; 2252 2253 if (nh->nh_dev) 2254 payload += nla_total_size(4); /* RTA_OIF */ 2255 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC) /* RTA_VIA */ 2256 payload += nla_total_size(2 + nh->nh_via_alen); 2257 if (nh->nh_labels) /* RTA_NEWDST */ 2258 payload += nla_total_size(nh->nh_labels * 4); 2259 } else { 2260 /* each nexthop is packed in an attribute */ 2261 size_t nhsize = 0; 2262 2263 for_nexthops(rt) { 2264 if (!rtnl_dereference(nh->nh_dev)) 2265 continue; 2266 nhsize += nla_total_size(sizeof(struct rtnexthop)); 2267 /* RTA_VIA */ 2268 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC) 2269 nhsize += nla_total_size(2 + nh->nh_via_alen); 2270 if (nh->nh_labels) 2271 nhsize += nla_total_size(nh->nh_labels * 4); 2272 } endfor_nexthops(rt); 2273 /* nested attribute */ 2274 payload += nla_total_size(nhsize); 2275 } 2276 2277 return payload; 2278} 2279 2280static void rtmsg_lfib(int event, u32 label, struct mpls_route *rt, 2281 struct nlmsghdr *nlh, struct net *net, u32 portid, 2282 unsigned int nlm_flags) 2283{ 2284 struct sk_buff *skb; 2285 u32 seq = nlh ? nlh->nlmsg_seq : 0; 2286 int err = -ENOBUFS; 2287 2288 skb = nlmsg_new(lfib_nlmsg_size(rt), GFP_KERNEL); 2289 if (skb == NULL) 2290 goto errout; 2291 2292 err = mpls_dump_route(skb, portid, seq, event, label, rt, nlm_flags); 2293 if (err < 0) { 2294 /* -EMSGSIZE implies BUG in lfib_nlmsg_size */ 2295 WARN_ON(err == -EMSGSIZE); 2296 kfree_skb(skb); 2297 goto errout; 2298 } 2299 rtnl_notify(skb, net, portid, RTNLGRP_MPLS_ROUTE, nlh, GFP_KERNEL); 2300 2301 return; 2302errout: 2303 if (err < 0) 2304 rtnl_set_sk_err(net, RTNLGRP_MPLS_ROUTE, err); 2305} 2306 2307static int mpls_valid_getroute_req(struct sk_buff *skb, 2308 const struct nlmsghdr *nlh, 2309 struct nlattr **tb, 2310 struct netlink_ext_ack *extack) 2311{ 2312 struct rtmsg *rtm; 2313 int i, err; 2314 2315 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) { 2316 NL_SET_ERR_MSG_MOD(extack, 2317 "Invalid header for get route request"); 2318 return -EINVAL; 2319 } 2320 2321 if (!netlink_strict_get_check(skb)) 2322 return nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX, 2323 rtm_mpls_policy, extack); 2324 2325 rtm = nlmsg_data(nlh); 2326 if ((rtm->rtm_dst_len && rtm->rtm_dst_len != 20) || 2327 rtm->rtm_src_len || rtm->rtm_tos || rtm->rtm_table || 2328 rtm->rtm_protocol || rtm->rtm_scope || rtm->rtm_type) { 2329 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get route request"); 2330 return -EINVAL; 2331 } 2332 if (rtm->rtm_flags & ~RTM_F_FIB_MATCH) { 2333 NL_SET_ERR_MSG_MOD(extack, 2334 "Invalid flags for get route request"); 2335 return -EINVAL; 2336 } 2337 2338 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX, 2339 rtm_mpls_policy, extack); 2340 if (err) 2341 return err; 2342 2343 if ((tb[RTA_DST] || tb[RTA_NEWDST]) && !rtm->rtm_dst_len) { 2344 NL_SET_ERR_MSG_MOD(extack, "rtm_dst_len must be 20 for MPLS"); 2345 return -EINVAL; 2346 } 2347 2348 for (i = 0; i <= RTA_MAX; i++) { 2349 if (!tb[i]) 2350 continue; 2351 2352 switch (i) { 2353 case RTA_DST: 2354 case RTA_NEWDST: 2355 break; 2356 default: 2357 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get route request"); 2358 return -EINVAL; 2359 } 2360 } 2361 2362 return 0; 2363} 2364 2365static int mpls_getroute(struct sk_buff *in_skb, struct nlmsghdr *in_nlh, 2366 struct netlink_ext_ack *extack) 2367{ 2368 struct net *net = sock_net(in_skb->sk); 2369 u32 portid = NETLINK_CB(in_skb).portid; 2370 u32 in_label = LABEL_NOT_SPECIFIED; 2371 struct nlattr *tb[RTA_MAX + 1]; 2372 u32 labels[MAX_NEW_LABELS]; 2373 struct mpls_shim_hdr *hdr; 2374 unsigned int hdr_size = 0; 2375 struct net_device *dev; 2376 struct mpls_route *rt; 2377 struct rtmsg *rtm, *r; 2378 struct nlmsghdr *nlh; 2379 struct sk_buff *skb; 2380 struct mpls_nh *nh; 2381 u8 n_labels; 2382 int err; 2383 2384 err = mpls_valid_getroute_req(in_skb, in_nlh, tb, extack); 2385 if (err < 0) 2386 goto errout; 2387 2388 rtm = nlmsg_data(in_nlh); 2389 2390 if (tb[RTA_DST]) { 2391 u8 label_count; 2392 2393 if (nla_get_labels(tb[RTA_DST], 1, &label_count, 2394 &in_label, extack)) { 2395 err = -EINVAL; 2396 goto errout; 2397 } 2398 2399 if (!mpls_label_ok(net, &in_label, extack)) { 2400 err = -EINVAL; 2401 goto errout; 2402 } 2403 } 2404 2405 rt = mpls_route_input_rcu(net, in_label); 2406 if (!rt) { 2407 err = -ENETUNREACH; 2408 goto errout; 2409 } 2410 2411 if (rtm->rtm_flags & RTM_F_FIB_MATCH) { 2412 skb = nlmsg_new(lfib_nlmsg_size(rt), GFP_KERNEL); 2413 if (!skb) { 2414 err = -ENOBUFS; 2415 goto errout; 2416 } 2417 2418 err = mpls_dump_route(skb, portid, in_nlh->nlmsg_seq, 2419 RTM_NEWROUTE, in_label, rt, 0); 2420 if (err < 0) { 2421 /* -EMSGSIZE implies BUG in lfib_nlmsg_size */ 2422 WARN_ON(err == -EMSGSIZE); 2423 goto errout_free; 2424 } 2425 2426 return rtnl_unicast(skb, net, portid); 2427 } 2428 2429 if (tb[RTA_NEWDST]) { 2430 if (nla_get_labels(tb[RTA_NEWDST], MAX_NEW_LABELS, &n_labels, 2431 labels, extack) != 0) { 2432 err = -EINVAL; 2433 goto errout; 2434 } 2435 2436 hdr_size = n_labels * sizeof(struct mpls_shim_hdr); 2437 } 2438 2439 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); 2440 if (!skb) { 2441 err = -ENOBUFS; 2442 goto errout; 2443 } 2444 2445 skb->protocol = htons(ETH_P_MPLS_UC); 2446 2447 if (hdr_size) { 2448 bool bos; 2449 int i; 2450 2451 if (skb_cow(skb, hdr_size)) { 2452 err = -ENOBUFS; 2453 goto errout_free; 2454 } 2455 2456 skb_reserve(skb, hdr_size); 2457 skb_push(skb, hdr_size); 2458 skb_reset_network_header(skb); 2459 2460 /* Push new labels */ 2461 hdr = mpls_hdr(skb); 2462 bos = true; 2463 for (i = n_labels - 1; i >= 0; i--) { 2464 hdr[i] = mpls_entry_encode(labels[i], 2465 1, 0, bos); 2466 bos = false; 2467 } 2468 } 2469 2470 nh = mpls_select_multipath(rt, skb); 2471 if (!nh) { 2472 err = -ENETUNREACH; 2473 goto errout_free; 2474 } 2475 2476 if (hdr_size) { 2477 skb_pull(skb, hdr_size); 2478 skb_reset_network_header(skb); 2479 } 2480 2481 nlh = nlmsg_put(skb, portid, in_nlh->nlmsg_seq, 2482 RTM_NEWROUTE, sizeof(*r), 0); 2483 if (!nlh) { 2484 err = -EMSGSIZE; 2485 goto errout_free; 2486 } 2487 2488 r = nlmsg_data(nlh); 2489 r->rtm_family = AF_MPLS; 2490 r->rtm_dst_len = 20; 2491 r->rtm_src_len = 0; 2492 r->rtm_table = RT_TABLE_MAIN; 2493 r->rtm_type = RTN_UNICAST; 2494 r->rtm_scope = RT_SCOPE_UNIVERSE; 2495 r->rtm_protocol = rt->rt_protocol; 2496 r->rtm_flags = 0; 2497 2498 if (nla_put_labels(skb, RTA_DST, 1, &in_label)) 2499 goto nla_put_failure; 2500 2501 if (nh->nh_labels && 2502 nla_put_labels(skb, RTA_NEWDST, nh->nh_labels, 2503 nh->nh_label)) 2504 goto nla_put_failure; 2505 2506 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC && 2507 nla_put_via(skb, nh->nh_via_table, mpls_nh_via(rt, nh), 2508 nh->nh_via_alen)) 2509 goto nla_put_failure; 2510 dev = rtnl_dereference(nh->nh_dev); 2511 if (dev && nla_put_u32(skb, RTA_OIF, dev->ifindex)) 2512 goto nla_put_failure; 2513 2514 nlmsg_end(skb, nlh); 2515 2516 err = rtnl_unicast(skb, net, portid); 2517errout: 2518 return err; 2519 2520nla_put_failure: 2521 nlmsg_cancel(skb, nlh); 2522 err = -EMSGSIZE; 2523errout_free: 2524 kfree_skb(skb); 2525 return err; 2526} 2527 2528static int resize_platform_label_table(struct net *net, size_t limit) 2529{ 2530 size_t size = sizeof(struct mpls_route *) * limit; 2531 size_t old_limit; 2532 size_t cp_size; 2533 struct mpls_route __rcu **labels = NULL, **old; 2534 struct mpls_route *rt0 = NULL, *rt2 = NULL; 2535 unsigned index; 2536 2537 if (size) { 2538 labels = kvzalloc(size, GFP_KERNEL); 2539 if (!labels) 2540 goto nolabels; 2541 } 2542 2543 /* In case the predefined labels need to be populated */ 2544 if (limit > MPLS_LABEL_IPV4NULL) { 2545 struct net_device *lo = net->loopback_dev; 2546 rt0 = mpls_rt_alloc(1, lo->addr_len, 0); 2547 if (IS_ERR(rt0)) 2548 goto nort0; 2549 RCU_INIT_POINTER(rt0->rt_nh->nh_dev, lo); 2550 rt0->rt_protocol = RTPROT_KERNEL; 2551 rt0->rt_payload_type = MPT_IPV4; 2552 rt0->rt_ttl_propagate = MPLS_TTL_PROP_DEFAULT; 2553 rt0->rt_nh->nh_via_table = NEIGH_LINK_TABLE; 2554 rt0->rt_nh->nh_via_alen = lo->addr_len; 2555 memcpy(__mpls_nh_via(rt0, rt0->rt_nh), lo->dev_addr, 2556 lo->addr_len); 2557 } 2558 if (limit > MPLS_LABEL_IPV6NULL) { 2559 struct net_device *lo = net->loopback_dev; 2560 rt2 = mpls_rt_alloc(1, lo->addr_len, 0); 2561 if (IS_ERR(rt2)) 2562 goto nort2; 2563 RCU_INIT_POINTER(rt2->rt_nh->nh_dev, lo); 2564 rt2->rt_protocol = RTPROT_KERNEL; 2565 rt2->rt_payload_type = MPT_IPV6; 2566 rt2->rt_ttl_propagate = MPLS_TTL_PROP_DEFAULT; 2567 rt2->rt_nh->nh_via_table = NEIGH_LINK_TABLE; 2568 rt2->rt_nh->nh_via_alen = lo->addr_len; 2569 memcpy(__mpls_nh_via(rt2, rt2->rt_nh), lo->dev_addr, 2570 lo->addr_len); 2571 } 2572 2573 rtnl_lock(); 2574 /* Remember the original table */ 2575 old = rtnl_dereference(net->mpls.platform_label); 2576 old_limit = net->mpls.platform_labels; 2577 2578 /* Free any labels beyond the new table */ 2579 for (index = limit; index < old_limit; index++) 2580 mpls_route_update(net, index, NULL, NULL); 2581 2582 /* Copy over the old labels */ 2583 cp_size = size; 2584 if (old_limit < limit) 2585 cp_size = old_limit * sizeof(struct mpls_route *); 2586 2587 memcpy(labels, old, cp_size); 2588 2589 /* If needed set the predefined labels */ 2590 if ((old_limit <= MPLS_LABEL_IPV6NULL) && 2591 (limit > MPLS_LABEL_IPV6NULL)) { 2592 RCU_INIT_POINTER(labels[MPLS_LABEL_IPV6NULL], rt2); 2593 rt2 = NULL; 2594 } 2595 2596 if ((old_limit <= MPLS_LABEL_IPV4NULL) && 2597 (limit > MPLS_LABEL_IPV4NULL)) { 2598 RCU_INIT_POINTER(labels[MPLS_LABEL_IPV4NULL], rt0); 2599 rt0 = NULL; 2600 } 2601 2602 /* Update the global pointers */ 2603 net->mpls.platform_labels = limit; 2604 rcu_assign_pointer(net->mpls.platform_label, labels); 2605 2606 rtnl_unlock(); 2607 2608 mpls_rt_free(rt2); 2609 mpls_rt_free(rt0); 2610 2611 if (old) { 2612 synchronize_rcu(); 2613 kvfree(old); 2614 } 2615 return 0; 2616 2617nort2: 2618 mpls_rt_free(rt0); 2619nort0: 2620 kvfree(labels); 2621nolabels: 2622 return -ENOMEM; 2623} 2624 2625static int mpls_platform_labels(struct ctl_table *table, int write, 2626 void *buffer, size_t *lenp, loff_t *ppos) 2627{ 2628 struct net *net = table->data; 2629 int platform_labels = net->mpls.platform_labels; 2630 int ret; 2631 struct ctl_table tmp = { 2632 .procname = table->procname, 2633 .data = &platform_labels, 2634 .maxlen = sizeof(int), 2635 .mode = table->mode, 2636 .extra1 = SYSCTL_ZERO, 2637 .extra2 = &label_limit, 2638 }; 2639 2640 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); 2641 2642 if (write && ret == 0) 2643 ret = resize_platform_label_table(net, platform_labels); 2644 2645 return ret; 2646} 2647 2648#define MPLS_NS_SYSCTL_OFFSET(field) \ 2649 (&((struct net *)0)->field) 2650 2651static const struct ctl_table mpls_table[] = { 2652 { 2653 .procname = "platform_labels", 2654 .data = NULL, 2655 .maxlen = sizeof(int), 2656 .mode = 0644, 2657 .proc_handler = mpls_platform_labels, 2658 }, 2659 { 2660 .procname = "ip_ttl_propagate", 2661 .data = MPLS_NS_SYSCTL_OFFSET(mpls.ip_ttl_propagate), 2662 .maxlen = sizeof(int), 2663 .mode = 0644, 2664 .proc_handler = proc_dointvec_minmax, 2665 .extra1 = SYSCTL_ZERO, 2666 .extra2 = SYSCTL_ONE, 2667 }, 2668 { 2669 .procname = "default_ttl", 2670 .data = MPLS_NS_SYSCTL_OFFSET(mpls.default_ttl), 2671 .maxlen = sizeof(int), 2672 .mode = 0644, 2673 .proc_handler = proc_dointvec_minmax, 2674 .extra1 = SYSCTL_ONE, 2675 .extra2 = &ttl_max, 2676 }, 2677 { } 2678}; 2679 2680static int mpls_net_init(struct net *net) 2681{ 2682 struct ctl_table *table; 2683 int i; 2684 2685 net->mpls.platform_labels = 0; 2686 net->mpls.platform_label = NULL; 2687 net->mpls.ip_ttl_propagate = 1; 2688 net->mpls.default_ttl = 255; 2689 2690 table = kmemdup(mpls_table, sizeof(mpls_table), GFP_KERNEL); 2691 if (table == NULL) 2692 return -ENOMEM; 2693 2694 /* Table data contains only offsets relative to the base of 2695 * the mdev at this point, so make them absolute. 2696 */ 2697 for (i = 0; i < ARRAY_SIZE(mpls_table) - 1; i++) 2698 table[i].data = (char *)net + (uintptr_t)table[i].data; 2699 2700 net->mpls.ctl = register_net_sysctl(net, "net/mpls", table); 2701 if (net->mpls.ctl == NULL) { 2702 kfree(table); 2703 return -ENOMEM; 2704 } 2705 2706 return 0; 2707} 2708 2709static void mpls_net_exit(struct net *net) 2710{ 2711 struct mpls_route __rcu **platform_label; 2712 size_t platform_labels; 2713 struct ctl_table *table; 2714 unsigned int index; 2715 2716 table = net->mpls.ctl->ctl_table_arg; 2717 unregister_net_sysctl_table(net->mpls.ctl); 2718 kfree(table); 2719 2720 /* An rcu grace period has passed since there was a device in 2721 * the network namespace (and thus the last in flight packet) 2722 * left this network namespace. This is because 2723 * unregister_netdevice_many and netdev_run_todo has completed 2724 * for each network device that was in this network namespace. 2725 * 2726 * As such no additional rcu synchronization is necessary when 2727 * freeing the platform_label table. 2728 */ 2729 rtnl_lock(); 2730 platform_label = rtnl_dereference(net->mpls.platform_label); 2731 platform_labels = net->mpls.platform_labels; 2732 for (index = 0; index < platform_labels; index++) { 2733 struct mpls_route *rt = rtnl_dereference(platform_label[index]); 2734 RCU_INIT_POINTER(platform_label[index], NULL); 2735 mpls_notify_route(net, index, rt, NULL, NULL); 2736 mpls_rt_free(rt); 2737 } 2738 rtnl_unlock(); 2739 2740 kvfree(platform_label); 2741} 2742 2743static struct pernet_operations mpls_net_ops = { 2744 .init = mpls_net_init, 2745 .exit = mpls_net_exit, 2746}; 2747 2748static struct rtnl_af_ops mpls_af_ops __read_mostly = { 2749 .family = AF_MPLS, 2750 .fill_stats_af = mpls_fill_stats_af, 2751 .get_stats_af_size = mpls_get_stats_af_size, 2752}; 2753 2754static int __init mpls_init(void) 2755{ 2756 int err; 2757 2758 BUILD_BUG_ON(sizeof(struct mpls_shim_hdr) != 4); 2759 2760 err = register_pernet_subsys(&mpls_net_ops); 2761 if (err) 2762 goto out; 2763 2764 err = register_netdevice_notifier(&mpls_dev_notifier); 2765 if (err) 2766 goto out_unregister_pernet; 2767 2768 dev_add_pack(&mpls_packet_type); 2769 2770 rtnl_af_register(&mpls_af_ops); 2771 2772 rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_NEWROUTE, 2773 mpls_rtm_newroute, NULL, 0); 2774 rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_DELROUTE, 2775 mpls_rtm_delroute, NULL, 0); 2776 rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_GETROUTE, 2777 mpls_getroute, mpls_dump_routes, 0); 2778 rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_GETNETCONF, 2779 mpls_netconf_get_devconf, 2780 mpls_netconf_dump_devconf, 0); 2781 err = ipgre_tunnel_encap_add_mpls_ops(); 2782 if (err) 2783 pr_err("Can't add mpls over gre tunnel ops\n"); 2784 2785 err = 0; 2786out: 2787 return err; 2788 2789out_unregister_pernet: 2790 unregister_pernet_subsys(&mpls_net_ops); 2791 goto out; 2792} 2793module_init(mpls_init); 2794 2795static void __exit mpls_exit(void) 2796{ 2797 rtnl_unregister_all(PF_MPLS); 2798 rtnl_af_unregister(&mpls_af_ops); 2799 dev_remove_pack(&mpls_packet_type); 2800 unregister_netdevice_notifier(&mpls_dev_notifier); 2801 unregister_pernet_subsys(&mpls_net_ops); 2802 ipgre_tunnel_encap_del_mpls_ops(); 2803} 2804module_exit(mpls_exit); 2805 2806MODULE_DESCRIPTION("MultiProtocol Label Switching"); 2807MODULE_LICENSE("GPL v2"); 2808MODULE_ALIAS_NETPROTO(PF_MPLS); 2809