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/gso.h> 16 #include <net/ip.h> 17 #include <net/dst.h> 18 #include <net/sock.h> 19 #include <net/arp.h> 20 #include <net/ip_fib.h> 21 #include <net/netevent.h> 22 #include <net/ip_tunnels.h> 23 #include <net/netns/generic.h> 24 #if IS_ENABLED(CONFIG_IPV6) 25 #include <net/ipv6.h> 26 #endif 27 #include <net/ipv6_stubs.h> 28 #include <net/rtnh.h> 29 #include "internal.h" 30 31 /* max memory we will use for mpls_route */ 32 #define MAX_MPLS_ROUTE_MEM 4096 33 34 /* Maximum number of labels to look ahead at when selecting a path of 35 * a multipath route 36 */ 37 #define MAX_MP_SELECT_LABELS 4 38 39 #define MPLS_NEIGH_TABLE_UNSPEC (NEIGH_LINK_TABLE + 1) 40 41 static int label_limit = (1 << 20) - 1; 42 static int ttl_max = 255; 43 44 #if IS_ENABLED(CONFIG_NET_IP_TUNNEL) 45 static size_t ipgre_mpls_encap_hlen(struct ip_tunnel_encap *e) 46 { 47 return sizeof(struct mpls_shim_hdr); 48 } 49 50 static const struct ip_tunnel_encap_ops mpls_iptun_ops = { 51 .encap_hlen = ipgre_mpls_encap_hlen, 52 }; 53 54 static int ipgre_tunnel_encap_add_mpls_ops(void) 55 { 56 return ip_tunnel_encap_add_ops(&mpls_iptun_ops, TUNNEL_ENCAP_MPLS); 57 } 58 59 static void ipgre_tunnel_encap_del_mpls_ops(void) 60 { 61 ip_tunnel_encap_del_ops(&mpls_iptun_ops, TUNNEL_ENCAP_MPLS); 62 } 63 #else 64 static int ipgre_tunnel_encap_add_mpls_ops(void) 65 { 66 return 0; 67 } 68 69 static void ipgre_tunnel_encap_del_mpls_ops(void) 70 { 71 } 72 #endif 73 74 static void rtmsg_lfib(int event, u32 label, struct mpls_route *rt, 75 struct nlmsghdr *nlh, struct net *net, u32 portid, 76 unsigned int nlm_flags); 77 78 static struct mpls_route *mpls_route_input_rcu(struct net *net, unsigned index) 79 { 80 struct mpls_route *rt = NULL; 81 82 if (index < net->mpls.platform_labels) { 83 struct mpls_route __rcu **platform_label = 84 rcu_dereference(net->mpls.platform_label); 85 rt = rcu_dereference(platform_label[index]); 86 } 87 return rt; 88 } 89 90 bool mpls_output_possible(const struct net_device *dev) 91 { 92 return dev && (dev->flags & IFF_UP) && netif_carrier_ok(dev); 93 } 94 EXPORT_SYMBOL_GPL(mpls_output_possible); 95 96 static u8 *__mpls_nh_via(struct mpls_route *rt, struct mpls_nh *nh) 97 { 98 return (u8 *)nh + rt->rt_via_offset; 99 } 100 101 static const u8 *mpls_nh_via(const struct mpls_route *rt, 102 const struct mpls_nh *nh) 103 { 104 return __mpls_nh_via((struct mpls_route *)rt, (struct mpls_nh *)nh); 105 } 106 107 static unsigned int mpls_nh_header_size(const struct mpls_nh *nh) 108 { 109 /* The size of the layer 2.5 labels to be added for this route */ 110 return nh->nh_labels * sizeof(struct mpls_shim_hdr); 111 } 112 113 unsigned int mpls_dev_mtu(const struct net_device *dev) 114 { 115 /* The amount of data the layer 2 frame can hold */ 116 return dev->mtu; 117 } 118 EXPORT_SYMBOL_GPL(mpls_dev_mtu); 119 120 bool mpls_pkt_too_big(const struct sk_buff *skb, unsigned int mtu) 121 { 122 if (skb->len <= mtu) 123 return false; 124 125 if (skb_is_gso(skb) && skb_gso_validate_network_len(skb, mtu)) 126 return false; 127 128 return true; 129 } 130 EXPORT_SYMBOL_GPL(mpls_pkt_too_big); 131 132 void mpls_stats_inc_outucastpkts(struct net_device *dev, 133 const struct sk_buff *skb) 134 { 135 struct mpls_dev *mdev; 136 137 if (skb->protocol == htons(ETH_P_MPLS_UC)) { 138 mdev = mpls_dev_get(dev); 139 if (mdev) 140 MPLS_INC_STATS_LEN(mdev, skb->len, 141 tx_packets, 142 tx_bytes); 143 } else if (skb->protocol == htons(ETH_P_IP)) { 144 IP_UPD_PO_STATS(dev_net(dev), IPSTATS_MIB_OUT, skb->len); 145 #if IS_ENABLED(CONFIG_IPV6) 146 } else if (skb->protocol == htons(ETH_P_IPV6)) { 147 struct inet6_dev *in6dev = __in6_dev_get(dev); 148 149 if (in6dev) 150 IP6_UPD_PO_STATS(dev_net(dev), in6dev, 151 IPSTATS_MIB_OUT, skb->len); 152 #endif 153 } 154 } 155 EXPORT_SYMBOL_GPL(mpls_stats_inc_outucastpkts); 156 157 static u32 mpls_multipath_hash(struct mpls_route *rt, struct sk_buff *skb) 158 { 159 struct mpls_entry_decoded dec; 160 unsigned int mpls_hdr_len = 0; 161 struct mpls_shim_hdr *hdr; 162 bool eli_seen = false; 163 int label_index; 164 u32 hash = 0; 165 166 for (label_index = 0; label_index < MAX_MP_SELECT_LABELS; 167 label_index++) { 168 mpls_hdr_len += sizeof(*hdr); 169 if (!pskb_may_pull(skb, mpls_hdr_len)) 170 break; 171 172 /* Read and decode the current label */ 173 hdr = mpls_hdr(skb) + label_index; 174 dec = mpls_entry_decode(hdr); 175 176 /* RFC6790 - reserved labels MUST NOT be used as keys 177 * for the load-balancing function 178 */ 179 if (likely(dec.label >= MPLS_LABEL_FIRST_UNRESERVED)) { 180 hash = jhash_1word(dec.label, hash); 181 182 /* The entropy label follows the entropy label 183 * indicator, so this means that the entropy 184 * label was just added to the hash - no need to 185 * go any deeper either in the label stack or in the 186 * payload 187 */ 188 if (eli_seen) 189 break; 190 } else if (dec.label == MPLS_LABEL_ENTROPY) { 191 eli_seen = true; 192 } 193 194 if (!dec.bos) 195 continue; 196 197 /* found bottom label; does skb have room for a header? */ 198 if (pskb_may_pull(skb, mpls_hdr_len + sizeof(struct iphdr))) { 199 const struct iphdr *v4hdr; 200 201 v4hdr = (const struct iphdr *)(hdr + 1); 202 if (v4hdr->version == 4) { 203 hash = jhash_3words(ntohl(v4hdr->saddr), 204 ntohl(v4hdr->daddr), 205 v4hdr->protocol, hash); 206 } else if (v4hdr->version == 6 && 207 pskb_may_pull(skb, mpls_hdr_len + 208 sizeof(struct ipv6hdr))) { 209 const struct ipv6hdr *v6hdr; 210 211 v6hdr = (const struct ipv6hdr *)(hdr + 1); 212 hash = __ipv6_addr_jhash(&v6hdr->saddr, hash); 213 hash = __ipv6_addr_jhash(&v6hdr->daddr, hash); 214 hash = jhash_1word(v6hdr->nexthdr, hash); 215 } 216 } 217 218 break; 219 } 220 221 return hash; 222 } 223 224 static struct mpls_nh *mpls_get_nexthop(struct mpls_route *rt, u8 index) 225 { 226 return (struct mpls_nh *)((u8 *)rt->rt_nh + index * rt->rt_nh_size); 227 } 228 229 /* number of alive nexthops (rt->rt_nhn_alive) and the flags for 230 * a next hop (nh->nh_flags) are modified by netdev event handlers. 231 * Since those fields can change at any moment, use READ_ONCE to 232 * access both. 233 */ 234 static const struct mpls_nh *mpls_select_multipath(struct mpls_route *rt, 235 struct sk_buff *skb) 236 { 237 u32 hash = 0; 238 int nh_index = 0; 239 int n = 0; 240 u8 alive; 241 242 /* No need to look further into packet if there's only 243 * one path 244 */ 245 if (rt->rt_nhn == 1) 246 return rt->rt_nh; 247 248 alive = READ_ONCE(rt->rt_nhn_alive); 249 if (alive == 0) 250 return NULL; 251 252 hash = mpls_multipath_hash(rt, skb); 253 nh_index = hash % alive; 254 if (alive == rt->rt_nhn) 255 goto out; 256 for_nexthops(rt) { 257 unsigned int nh_flags = READ_ONCE(nh->nh_flags); 258 259 if (nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)) 260 continue; 261 if (n == nh_index) 262 return nh; 263 n++; 264 } endfor_nexthops(rt); 265 266 out: 267 return mpls_get_nexthop(rt, nh_index); 268 } 269 270 static bool mpls_egress(struct net *net, struct mpls_route *rt, 271 struct sk_buff *skb, struct mpls_entry_decoded dec) 272 { 273 enum mpls_payload_type payload_type; 274 bool success = false; 275 276 /* The IPv4 code below accesses through the IPv4 header 277 * checksum, which is 12 bytes into the packet. 278 * The IPv6 code below accesses through the IPv6 hop limit 279 * which is 8 bytes into the packet. 280 * 281 * For all supported cases there should always be at least 12 282 * bytes of packet data present. The IPv4 header is 20 bytes 283 * without options and the IPv6 header is always 40 bytes 284 * long. 285 */ 286 if (!pskb_may_pull(skb, 12)) 287 return false; 288 289 payload_type = rt->rt_payload_type; 290 if (payload_type == MPT_UNSPEC) 291 payload_type = ip_hdr(skb)->version; 292 293 switch (payload_type) { 294 case MPT_IPV4: { 295 struct iphdr *hdr4 = ip_hdr(skb); 296 u8 new_ttl; 297 skb->protocol = htons(ETH_P_IP); 298 299 /* If propagating TTL, take the decremented TTL from 300 * the incoming MPLS header, otherwise decrement the 301 * TTL, but only if not 0 to avoid underflow. 302 */ 303 if (rt->rt_ttl_propagate == MPLS_TTL_PROP_ENABLED || 304 (rt->rt_ttl_propagate == MPLS_TTL_PROP_DEFAULT && 305 net->mpls.ip_ttl_propagate)) 306 new_ttl = dec.ttl; 307 else 308 new_ttl = hdr4->ttl ? hdr4->ttl - 1 : 0; 309 310 csum_replace2(&hdr4->check, 311 htons(hdr4->ttl << 8), 312 htons(new_ttl << 8)); 313 hdr4->ttl = new_ttl; 314 success = true; 315 break; 316 } 317 case MPT_IPV6: { 318 struct ipv6hdr *hdr6 = ipv6_hdr(skb); 319 skb->protocol = htons(ETH_P_IPV6); 320 321 /* If propagating TTL, take the decremented TTL from 322 * the incoming MPLS header, otherwise decrement the 323 * hop limit, but only if not 0 to avoid underflow. 324 */ 325 if (rt->rt_ttl_propagate == MPLS_TTL_PROP_ENABLED || 326 (rt->rt_ttl_propagate == MPLS_TTL_PROP_DEFAULT && 327 net->mpls.ip_ttl_propagate)) 328 hdr6->hop_limit = dec.ttl; 329 else if (hdr6->hop_limit) 330 hdr6->hop_limit = hdr6->hop_limit - 1; 331 success = true; 332 break; 333 } 334 case MPT_UNSPEC: 335 /* Should have decided which protocol it is by now */ 336 break; 337 } 338 339 return success; 340 } 341 342 static int mpls_forward(struct sk_buff *skb, struct net_device *dev, 343 struct packet_type *pt, struct net_device *orig_dev) 344 { 345 struct net *net = dev_net(dev); 346 struct mpls_shim_hdr *hdr; 347 const struct mpls_nh *nh; 348 struct mpls_route *rt; 349 struct mpls_entry_decoded dec; 350 struct net_device *out_dev; 351 struct mpls_dev *out_mdev; 352 struct mpls_dev *mdev; 353 unsigned int hh_len; 354 unsigned int new_header_size; 355 unsigned int mtu; 356 int err; 357 358 /* Careful this entire function runs inside of an rcu critical section */ 359 360 mdev = mpls_dev_get(dev); 361 if (!mdev) 362 goto drop; 363 364 MPLS_INC_STATS_LEN(mdev, skb->len, rx_packets, 365 rx_bytes); 366 367 if (!mdev->input_enabled) { 368 MPLS_INC_STATS(mdev, rx_dropped); 369 goto drop; 370 } 371 372 if (skb->pkt_type != PACKET_HOST) 373 goto err; 374 375 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) 376 goto err; 377 378 if (!pskb_may_pull(skb, sizeof(*hdr))) 379 goto err; 380 381 skb_dst_drop(skb); 382 383 /* Read and decode the label */ 384 hdr = mpls_hdr(skb); 385 dec = mpls_entry_decode(hdr); 386 387 rt = mpls_route_input_rcu(net, dec.label); 388 if (!rt) { 389 MPLS_INC_STATS(mdev, rx_noroute); 390 goto drop; 391 } 392 393 nh = mpls_select_multipath(rt, skb); 394 if (!nh) 395 goto err; 396 397 /* Pop the label */ 398 skb_pull(skb, sizeof(*hdr)); 399 skb_reset_network_header(skb); 400 401 skb_orphan(skb); 402 403 if (skb_warn_if_lro(skb)) 404 goto err; 405 406 skb_forward_csum(skb); 407 408 /* Verify ttl is valid */ 409 if (dec.ttl <= 1) 410 goto err; 411 412 /* Find the output device */ 413 out_dev = nh->nh_dev; 414 if (!mpls_output_possible(out_dev)) 415 goto tx_err; 416 417 /* Verify the destination can hold the packet */ 418 new_header_size = mpls_nh_header_size(nh); 419 mtu = mpls_dev_mtu(out_dev); 420 if (mpls_pkt_too_big(skb, mtu - new_header_size)) 421 goto tx_err; 422 423 hh_len = LL_RESERVED_SPACE(out_dev); 424 if (!out_dev->header_ops) 425 hh_len = 0; 426 427 /* Ensure there is enough space for the headers in the skb */ 428 if (skb_cow(skb, hh_len + new_header_size)) 429 goto tx_err; 430 431 skb->dev = out_dev; 432 skb->protocol = htons(ETH_P_MPLS_UC); 433 434 dec.ttl -= 1; 435 if (unlikely(!new_header_size && dec.bos)) { 436 /* Penultimate hop popping */ 437 if (!mpls_egress(dev_net(out_dev), rt, skb, dec)) 438 goto err; 439 } else { 440 bool bos; 441 int i; 442 skb_push(skb, new_header_size); 443 skb_reset_network_header(skb); 444 /* Push the new labels */ 445 hdr = mpls_hdr(skb); 446 bos = dec.bos; 447 for (i = nh->nh_labels - 1; i >= 0; i--) { 448 hdr[i] = mpls_entry_encode(nh->nh_label[i], 449 dec.ttl, 0, bos); 450 bos = false; 451 } 452 } 453 454 mpls_stats_inc_outucastpkts(out_dev, skb); 455 456 /* If via wasn't specified then send out using device address */ 457 if (nh->nh_via_table == MPLS_NEIGH_TABLE_UNSPEC) 458 err = neigh_xmit(NEIGH_LINK_TABLE, out_dev, 459 out_dev->dev_addr, skb); 460 else 461 err = neigh_xmit(nh->nh_via_table, out_dev, 462 mpls_nh_via(rt, nh), skb); 463 if (err) 464 net_dbg_ratelimited("%s: packet transmission failed: %d\n", 465 __func__, err); 466 return 0; 467 468 tx_err: 469 out_mdev = out_dev ? mpls_dev_get(out_dev) : NULL; 470 if (out_mdev) 471 MPLS_INC_STATS(out_mdev, tx_errors); 472 goto drop; 473 err: 474 MPLS_INC_STATS(mdev, rx_errors); 475 drop: 476 kfree_skb(skb); 477 return NET_RX_DROP; 478 } 479 480 static struct packet_type mpls_packet_type __read_mostly = { 481 .type = cpu_to_be16(ETH_P_MPLS_UC), 482 .func = mpls_forward, 483 }; 484 485 static const struct nla_policy rtm_mpls_policy[RTA_MAX+1] = { 486 [RTA_DST] = { .type = NLA_U32 }, 487 [RTA_OIF] = { .type = NLA_U32 }, 488 [RTA_TTL_PROPAGATE] = { .type = NLA_U8 }, 489 }; 490 491 struct mpls_route_config { 492 u32 rc_protocol; 493 u32 rc_ifindex; 494 u8 rc_via_table; 495 u8 rc_via_alen; 496 u8 rc_via[MAX_VIA_ALEN]; 497 u32 rc_label; 498 u8 rc_ttl_propagate; 499 u8 rc_output_labels; 500 u32 rc_output_label[MAX_NEW_LABELS]; 501 u32 rc_nlflags; 502 enum mpls_payload_type rc_payload_type; 503 struct nl_info rc_nlinfo; 504 struct rtnexthop *rc_mp; 505 int rc_mp_len; 506 }; 507 508 /* all nexthops within a route have the same size based on max 509 * number of labels and max via length for a hop 510 */ 511 static struct mpls_route *mpls_rt_alloc(u8 num_nh, u8 max_alen, u8 max_labels) 512 { 513 u8 nh_size = MPLS_NH_SIZE(max_labels, max_alen); 514 struct mpls_route *rt; 515 size_t size; 516 517 size = sizeof(*rt) + num_nh * nh_size; 518 if (size > MAX_MPLS_ROUTE_MEM) 519 return ERR_PTR(-EINVAL); 520 521 rt = kzalloc(size, GFP_KERNEL); 522 if (!rt) 523 return ERR_PTR(-ENOMEM); 524 525 rt->rt_nhn = num_nh; 526 rt->rt_nhn_alive = num_nh; 527 rt->rt_nh_size = nh_size; 528 rt->rt_via_offset = MPLS_NH_VIA_OFF(max_labels); 529 530 return rt; 531 } 532 533 static void mpls_rt_free(struct mpls_route *rt) 534 { 535 if (rt) 536 kfree_rcu(rt, rt_rcu); 537 } 538 539 static void mpls_notify_route(struct net *net, unsigned index, 540 struct mpls_route *old, struct mpls_route *new, 541 const struct nl_info *info) 542 { 543 struct nlmsghdr *nlh = info ? info->nlh : NULL; 544 unsigned portid = info ? info->portid : 0; 545 int event = new ? RTM_NEWROUTE : RTM_DELROUTE; 546 struct mpls_route *rt = new ? new : old; 547 unsigned nlm_flags = (old && new) ? NLM_F_REPLACE : 0; 548 /* Ignore reserved labels for now */ 549 if (rt && (index >= MPLS_LABEL_FIRST_UNRESERVED)) 550 rtmsg_lfib(event, index, rt, nlh, net, portid, nlm_flags); 551 } 552 553 static void mpls_route_update(struct net *net, unsigned index, 554 struct mpls_route *new, 555 const struct nl_info *info) 556 { 557 struct mpls_route __rcu **platform_label; 558 struct mpls_route *rt; 559 560 ASSERT_RTNL(); 561 562 platform_label = rtnl_dereference(net->mpls.platform_label); 563 rt = rtnl_dereference(platform_label[index]); 564 rcu_assign_pointer(platform_label[index], new); 565 566 mpls_notify_route(net, index, rt, new, info); 567 568 /* If we removed a route free it now */ 569 mpls_rt_free(rt); 570 } 571 572 static unsigned find_free_label(struct net *net) 573 { 574 struct mpls_route __rcu **platform_label; 575 size_t platform_labels; 576 unsigned index; 577 578 platform_label = rtnl_dereference(net->mpls.platform_label); 579 platform_labels = net->mpls.platform_labels; 580 for (index = MPLS_LABEL_FIRST_UNRESERVED; index < platform_labels; 581 index++) { 582 if (!rtnl_dereference(platform_label[index])) 583 return index; 584 } 585 return LABEL_NOT_SPECIFIED; 586 } 587 588 #if IS_ENABLED(CONFIG_INET) 589 static struct net_device *inet_fib_lookup_dev(struct net *net, 590 const void *addr) 591 { 592 struct net_device *dev; 593 struct rtable *rt; 594 struct in_addr daddr; 595 596 memcpy(&daddr, addr, sizeof(struct in_addr)); 597 rt = ip_route_output(net, daddr.s_addr, 0, 0, 0, RT_SCOPE_UNIVERSE); 598 if (IS_ERR(rt)) 599 return ERR_CAST(rt); 600 601 dev = rt->dst.dev; 602 dev_hold(dev); 603 604 ip_rt_put(rt); 605 606 return dev; 607 } 608 #else 609 static struct net_device *inet_fib_lookup_dev(struct net *net, 610 const void *addr) 611 { 612 return ERR_PTR(-EAFNOSUPPORT); 613 } 614 #endif 615 616 #if IS_ENABLED(CONFIG_IPV6) 617 static struct net_device *inet6_fib_lookup_dev(struct net *net, 618 const void *addr) 619 { 620 struct net_device *dev; 621 struct dst_entry *dst; 622 struct flowi6 fl6; 623 624 if (!ipv6_stub) 625 return ERR_PTR(-EAFNOSUPPORT); 626 627 memset(&fl6, 0, sizeof(fl6)); 628 memcpy(&fl6.daddr, addr, sizeof(struct in6_addr)); 629 dst = ipv6_stub->ipv6_dst_lookup_flow(net, NULL, &fl6, NULL); 630 if (IS_ERR(dst)) 631 return ERR_CAST(dst); 632 633 dev = dst->dev; 634 dev_hold(dev); 635 dst_release(dst); 636 637 return dev; 638 } 639 #else 640 static struct net_device *inet6_fib_lookup_dev(struct net *net, 641 const void *addr) 642 { 643 return ERR_PTR(-EAFNOSUPPORT); 644 } 645 #endif 646 647 static struct net_device *find_outdev(struct net *net, 648 struct mpls_route *rt, 649 struct mpls_nh *nh, int oif) 650 { 651 struct net_device *dev = NULL; 652 653 if (!oif) { 654 switch (nh->nh_via_table) { 655 case NEIGH_ARP_TABLE: 656 dev = inet_fib_lookup_dev(net, mpls_nh_via(rt, nh)); 657 break; 658 case NEIGH_ND_TABLE: 659 dev = inet6_fib_lookup_dev(net, mpls_nh_via(rt, nh)); 660 break; 661 case NEIGH_LINK_TABLE: 662 break; 663 } 664 } else { 665 dev = dev_get_by_index(net, oif); 666 } 667 668 if (!dev) 669 return ERR_PTR(-ENODEV); 670 671 if (IS_ERR(dev)) 672 return dev; 673 674 /* The caller is holding rtnl anyways, so release the dev reference */ 675 dev_put(dev); 676 677 return dev; 678 } 679 680 static int mpls_nh_assign_dev(struct net *net, struct mpls_route *rt, 681 struct mpls_nh *nh, int oif) 682 { 683 struct net_device *dev = NULL; 684 int err = -ENODEV; 685 686 dev = find_outdev(net, rt, nh, oif); 687 if (IS_ERR(dev)) { 688 err = PTR_ERR(dev); 689 dev = NULL; 690 goto errout; 691 } 692 693 /* Ensure this is a supported device */ 694 err = -EINVAL; 695 if (!mpls_dev_get(dev)) 696 goto errout; 697 698 if ((nh->nh_via_table == NEIGH_LINK_TABLE) && 699 (dev->addr_len != nh->nh_via_alen)) 700 goto errout; 701 702 nh->nh_dev = dev; 703 704 if (!(dev->flags & IFF_UP)) { 705 nh->nh_flags |= RTNH_F_DEAD; 706 } else { 707 unsigned int flags; 708 709 flags = dev_get_flags(dev); 710 if (!(flags & (IFF_RUNNING | IFF_LOWER_UP))) 711 nh->nh_flags |= RTNH_F_LINKDOWN; 712 } 713 714 return 0; 715 716 errout: 717 return err; 718 } 719 720 static int nla_get_via(const struct nlattr *nla, u8 *via_alen, u8 *via_table, 721 u8 via_addr[], struct netlink_ext_ack *extack) 722 { 723 struct rtvia *via = nla_data(nla); 724 int err = -EINVAL; 725 int alen; 726 727 if (nla_len(nla) < offsetof(struct rtvia, rtvia_addr)) { 728 NL_SET_ERR_MSG_ATTR(extack, nla, 729 "Invalid attribute length for RTA_VIA"); 730 goto errout; 731 } 732 alen = nla_len(nla) - 733 offsetof(struct rtvia, rtvia_addr); 734 if (alen > MAX_VIA_ALEN) { 735 NL_SET_ERR_MSG_ATTR(extack, nla, 736 "Invalid address length for RTA_VIA"); 737 goto errout; 738 } 739 740 /* Validate the address family */ 741 switch (via->rtvia_family) { 742 case AF_PACKET: 743 *via_table = NEIGH_LINK_TABLE; 744 break; 745 case AF_INET: 746 *via_table = NEIGH_ARP_TABLE; 747 if (alen != 4) 748 goto errout; 749 break; 750 case AF_INET6: 751 *via_table = NEIGH_ND_TABLE; 752 if (alen != 16) 753 goto errout; 754 break; 755 default: 756 /* Unsupported address family */ 757 goto errout; 758 } 759 760 memcpy(via_addr, via->rtvia_addr, alen); 761 *via_alen = alen; 762 err = 0; 763 764 errout: 765 return err; 766 } 767 768 static int mpls_nh_build_from_cfg(struct mpls_route_config *cfg, 769 struct mpls_route *rt) 770 { 771 struct net *net = cfg->rc_nlinfo.nl_net; 772 struct mpls_nh *nh = rt->rt_nh; 773 int err; 774 int i; 775 776 if (!nh) 777 return -ENOMEM; 778 779 nh->nh_labels = cfg->rc_output_labels; 780 for (i = 0; i < nh->nh_labels; i++) 781 nh->nh_label[i] = cfg->rc_output_label[i]; 782 783 nh->nh_via_table = cfg->rc_via_table; 784 memcpy(__mpls_nh_via(rt, nh), cfg->rc_via, cfg->rc_via_alen); 785 nh->nh_via_alen = cfg->rc_via_alen; 786 787 err = mpls_nh_assign_dev(net, rt, nh, cfg->rc_ifindex); 788 if (err) 789 goto errout; 790 791 if (nh->nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)) 792 rt->rt_nhn_alive--; 793 794 return 0; 795 796 errout: 797 return err; 798 } 799 800 static int mpls_nh_build(struct net *net, struct mpls_route *rt, 801 struct mpls_nh *nh, int oif, struct nlattr *via, 802 struct nlattr *newdst, u8 max_labels, 803 struct netlink_ext_ack *extack) 804 { 805 int err = -ENOMEM; 806 807 if (!nh) 808 goto errout; 809 810 if (newdst) { 811 err = nla_get_labels(newdst, max_labels, &nh->nh_labels, 812 nh->nh_label, extack); 813 if (err) 814 goto errout; 815 } 816 817 if (via) { 818 err = nla_get_via(via, &nh->nh_via_alen, &nh->nh_via_table, 819 __mpls_nh_via(rt, nh), extack); 820 if (err) 821 goto errout; 822 } else { 823 nh->nh_via_table = MPLS_NEIGH_TABLE_UNSPEC; 824 } 825 826 err = mpls_nh_assign_dev(net, rt, nh, oif); 827 if (err) 828 goto errout; 829 830 return 0; 831 832 errout: 833 return err; 834 } 835 836 static u8 mpls_count_nexthops(struct rtnexthop *rtnh, int len, 837 u8 cfg_via_alen, u8 *max_via_alen, 838 u8 *max_labels) 839 { 840 int remaining = len; 841 u8 nhs = 0; 842 843 *max_via_alen = 0; 844 *max_labels = 0; 845 846 while (rtnh_ok(rtnh, remaining)) { 847 struct nlattr *nla, *attrs = rtnh_attrs(rtnh); 848 int attrlen; 849 u8 n_labels = 0; 850 851 attrlen = rtnh_attrlen(rtnh); 852 nla = nla_find(attrs, attrlen, RTA_VIA); 853 if (nla && nla_len(nla) >= 854 offsetof(struct rtvia, rtvia_addr)) { 855 int via_alen = nla_len(nla) - 856 offsetof(struct rtvia, rtvia_addr); 857 858 if (via_alen <= MAX_VIA_ALEN) 859 *max_via_alen = max_t(u16, *max_via_alen, 860 via_alen); 861 } 862 863 nla = nla_find(attrs, attrlen, RTA_NEWDST); 864 if (nla && 865 nla_get_labels(nla, MAX_NEW_LABELS, &n_labels, 866 NULL, NULL) != 0) 867 return 0; 868 869 *max_labels = max_t(u8, *max_labels, n_labels); 870 871 /* number of nexthops is tracked by a u8. 872 * Check for overflow. 873 */ 874 if (nhs == 255) 875 return 0; 876 nhs++; 877 878 rtnh = rtnh_next(rtnh, &remaining); 879 } 880 881 /* leftover implies invalid nexthop configuration, discard it */ 882 return remaining > 0 ? 0 : nhs; 883 } 884 885 static int mpls_nh_build_multi(struct mpls_route_config *cfg, 886 struct mpls_route *rt, u8 max_labels, 887 struct netlink_ext_ack *extack) 888 { 889 struct rtnexthop *rtnh = cfg->rc_mp; 890 struct nlattr *nla_via, *nla_newdst; 891 int remaining = cfg->rc_mp_len; 892 int err = 0; 893 u8 nhs = 0; 894 895 change_nexthops(rt) { 896 int attrlen; 897 898 nla_via = NULL; 899 nla_newdst = NULL; 900 901 err = -EINVAL; 902 if (!rtnh_ok(rtnh, remaining)) 903 goto errout; 904 905 /* neither weighted multipath nor any flags 906 * are supported 907 */ 908 if (rtnh->rtnh_hops || rtnh->rtnh_flags) 909 goto errout; 910 911 attrlen = rtnh_attrlen(rtnh); 912 if (attrlen > 0) { 913 struct nlattr *attrs = rtnh_attrs(rtnh); 914 915 nla_via = nla_find(attrs, attrlen, RTA_VIA); 916 nla_newdst = nla_find(attrs, attrlen, RTA_NEWDST); 917 } 918 919 err = mpls_nh_build(cfg->rc_nlinfo.nl_net, rt, nh, 920 rtnh->rtnh_ifindex, nla_via, nla_newdst, 921 max_labels, extack); 922 if (err) 923 goto errout; 924 925 if (nh->nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)) 926 rt->rt_nhn_alive--; 927 928 rtnh = rtnh_next(rtnh, &remaining); 929 nhs++; 930 } endfor_nexthops(rt); 931 932 rt->rt_nhn = nhs; 933 934 return 0; 935 936 errout: 937 return err; 938 } 939 940 static bool mpls_label_ok(struct net *net, unsigned int *index, 941 struct netlink_ext_ack *extack) 942 { 943 bool is_ok = true; 944 945 /* Reserved labels may not be set */ 946 if (*index < MPLS_LABEL_FIRST_UNRESERVED) { 947 NL_SET_ERR_MSG(extack, 948 "Invalid label - must be MPLS_LABEL_FIRST_UNRESERVED or higher"); 949 is_ok = false; 950 } 951 952 /* The full 20 bit range may not be supported. */ 953 if (is_ok && *index >= net->mpls.platform_labels) { 954 NL_SET_ERR_MSG(extack, 955 "Label >= configured maximum in platform_labels"); 956 is_ok = false; 957 } 958 959 *index = array_index_nospec(*index, net->mpls.platform_labels); 960 return is_ok; 961 } 962 963 static int mpls_route_add(struct mpls_route_config *cfg, 964 struct netlink_ext_ack *extack) 965 { 966 struct mpls_route __rcu **platform_label; 967 struct net *net = cfg->rc_nlinfo.nl_net; 968 struct mpls_route *rt, *old; 969 int err = -EINVAL; 970 u8 max_via_alen; 971 unsigned index; 972 u8 max_labels; 973 u8 nhs; 974 975 index = cfg->rc_label; 976 977 /* If a label was not specified during insert pick one */ 978 if ((index == LABEL_NOT_SPECIFIED) && 979 (cfg->rc_nlflags & NLM_F_CREATE)) { 980 index = find_free_label(net); 981 } 982 983 if (!mpls_label_ok(net, &index, extack)) 984 goto errout; 985 986 /* Append makes no sense with mpls */ 987 err = -EOPNOTSUPP; 988 if (cfg->rc_nlflags & NLM_F_APPEND) { 989 NL_SET_ERR_MSG(extack, "MPLS does not support route append"); 990 goto errout; 991 } 992 993 err = -EEXIST; 994 platform_label = rtnl_dereference(net->mpls.platform_label); 995 old = rtnl_dereference(platform_label[index]); 996 if ((cfg->rc_nlflags & NLM_F_EXCL) && old) 997 goto errout; 998 999 err = -EEXIST; 1000 if (!(cfg->rc_nlflags & NLM_F_REPLACE) && old) 1001 goto errout; 1002 1003 err = -ENOENT; 1004 if (!(cfg->rc_nlflags & NLM_F_CREATE) && !old) 1005 goto errout; 1006 1007 err = -EINVAL; 1008 if (cfg->rc_mp) { 1009 nhs = mpls_count_nexthops(cfg->rc_mp, cfg->rc_mp_len, 1010 cfg->rc_via_alen, &max_via_alen, 1011 &max_labels); 1012 } else { 1013 max_via_alen = cfg->rc_via_alen; 1014 max_labels = cfg->rc_output_labels; 1015 nhs = 1; 1016 } 1017 1018 if (nhs == 0) { 1019 NL_SET_ERR_MSG(extack, "Route does not contain a nexthop"); 1020 goto errout; 1021 } 1022 1023 rt = mpls_rt_alloc(nhs, max_via_alen, max_labels); 1024 if (IS_ERR(rt)) { 1025 err = PTR_ERR(rt); 1026 goto errout; 1027 } 1028 1029 rt->rt_protocol = cfg->rc_protocol; 1030 rt->rt_payload_type = cfg->rc_payload_type; 1031 rt->rt_ttl_propagate = cfg->rc_ttl_propagate; 1032 1033 if (cfg->rc_mp) 1034 err = mpls_nh_build_multi(cfg, rt, max_labels, extack); 1035 else 1036 err = mpls_nh_build_from_cfg(cfg, rt); 1037 if (err) 1038 goto freert; 1039 1040 mpls_route_update(net, index, rt, &cfg->rc_nlinfo); 1041 1042 return 0; 1043 1044 freert: 1045 mpls_rt_free(rt); 1046 errout: 1047 return err; 1048 } 1049 1050 static int mpls_route_del(struct mpls_route_config *cfg, 1051 struct netlink_ext_ack *extack) 1052 { 1053 struct net *net = cfg->rc_nlinfo.nl_net; 1054 unsigned index; 1055 int err = -EINVAL; 1056 1057 index = cfg->rc_label; 1058 1059 if (!mpls_label_ok(net, &index, extack)) 1060 goto errout; 1061 1062 mpls_route_update(net, index, NULL, &cfg->rc_nlinfo); 1063 1064 err = 0; 1065 errout: 1066 return err; 1067 } 1068 1069 static void mpls_get_stats(struct mpls_dev *mdev, 1070 struct mpls_link_stats *stats) 1071 { 1072 struct mpls_pcpu_stats *p; 1073 int i; 1074 1075 memset(stats, 0, sizeof(*stats)); 1076 1077 for_each_possible_cpu(i) { 1078 struct mpls_link_stats local; 1079 unsigned int start; 1080 1081 p = per_cpu_ptr(mdev->stats, i); 1082 do { 1083 start = u64_stats_fetch_begin(&p->syncp); 1084 local = p->stats; 1085 } while (u64_stats_fetch_retry(&p->syncp, start)); 1086 1087 stats->rx_packets += local.rx_packets; 1088 stats->rx_bytes += local.rx_bytes; 1089 stats->tx_packets += local.tx_packets; 1090 stats->tx_bytes += local.tx_bytes; 1091 stats->rx_errors += local.rx_errors; 1092 stats->tx_errors += local.tx_errors; 1093 stats->rx_dropped += local.rx_dropped; 1094 stats->tx_dropped += local.tx_dropped; 1095 stats->rx_noroute += local.rx_noroute; 1096 } 1097 } 1098 1099 static int mpls_fill_stats_af(struct sk_buff *skb, 1100 const struct net_device *dev) 1101 { 1102 struct mpls_link_stats *stats; 1103 struct mpls_dev *mdev; 1104 struct nlattr *nla; 1105 1106 mdev = mpls_dev_get(dev); 1107 if (!mdev) 1108 return -ENODATA; 1109 1110 nla = nla_reserve_64bit(skb, MPLS_STATS_LINK, 1111 sizeof(struct mpls_link_stats), 1112 MPLS_STATS_UNSPEC); 1113 if (!nla) 1114 return -EMSGSIZE; 1115 1116 stats = nla_data(nla); 1117 mpls_get_stats(mdev, stats); 1118 1119 return 0; 1120 } 1121 1122 static size_t mpls_get_stats_af_size(const struct net_device *dev) 1123 { 1124 struct mpls_dev *mdev; 1125 1126 mdev = mpls_dev_get(dev); 1127 if (!mdev) 1128 return 0; 1129 1130 return nla_total_size_64bit(sizeof(struct mpls_link_stats)); 1131 } 1132 1133 static int mpls_netconf_fill_devconf(struct sk_buff *skb, struct mpls_dev *mdev, 1134 u32 portid, u32 seq, int event, 1135 unsigned int flags, int type) 1136 { 1137 struct nlmsghdr *nlh; 1138 struct netconfmsg *ncm; 1139 bool all = false; 1140 1141 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 1142 flags); 1143 if (!nlh) 1144 return -EMSGSIZE; 1145 1146 if (type == NETCONFA_ALL) 1147 all = true; 1148 1149 ncm = nlmsg_data(nlh); 1150 ncm->ncm_family = AF_MPLS; 1151 1152 if (nla_put_s32(skb, NETCONFA_IFINDEX, mdev->dev->ifindex) < 0) 1153 goto nla_put_failure; 1154 1155 if ((all || type == NETCONFA_INPUT) && 1156 nla_put_s32(skb, NETCONFA_INPUT, 1157 READ_ONCE(mdev->input_enabled)) < 0) 1158 goto nla_put_failure; 1159 1160 nlmsg_end(skb, nlh); 1161 return 0; 1162 1163 nla_put_failure: 1164 nlmsg_cancel(skb, nlh); 1165 return -EMSGSIZE; 1166 } 1167 1168 static int mpls_netconf_msgsize_devconf(int type) 1169 { 1170 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 1171 + nla_total_size(4); /* NETCONFA_IFINDEX */ 1172 bool all = false; 1173 1174 if (type == NETCONFA_ALL) 1175 all = true; 1176 1177 if (all || type == NETCONFA_INPUT) 1178 size += nla_total_size(4); 1179 1180 return size; 1181 } 1182 1183 static void mpls_netconf_notify_devconf(struct net *net, int event, 1184 int type, struct mpls_dev *mdev) 1185 { 1186 struct sk_buff *skb; 1187 int err = -ENOBUFS; 1188 1189 skb = nlmsg_new(mpls_netconf_msgsize_devconf(type), GFP_KERNEL); 1190 if (!skb) 1191 goto errout; 1192 1193 err = mpls_netconf_fill_devconf(skb, mdev, 0, 0, event, 0, type); 1194 if (err < 0) { 1195 /* -EMSGSIZE implies BUG in mpls_netconf_msgsize_devconf() */ 1196 WARN_ON(err == -EMSGSIZE); 1197 kfree_skb(skb); 1198 goto errout; 1199 } 1200 1201 rtnl_notify(skb, net, 0, RTNLGRP_MPLS_NETCONF, NULL, GFP_KERNEL); 1202 return; 1203 errout: 1204 if (err < 0) 1205 rtnl_set_sk_err(net, RTNLGRP_MPLS_NETCONF, err); 1206 } 1207 1208 static const struct nla_policy devconf_mpls_policy[NETCONFA_MAX + 1] = { 1209 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 1210 }; 1211 1212 static int mpls_netconf_valid_get_req(struct sk_buff *skb, 1213 const struct nlmsghdr *nlh, 1214 struct nlattr **tb, 1215 struct netlink_ext_ack *extack) 1216 { 1217 int i, err; 1218 1219 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) { 1220 NL_SET_ERR_MSG_MOD(extack, 1221 "Invalid header for netconf get request"); 1222 return -EINVAL; 1223 } 1224 1225 if (!netlink_strict_get_check(skb)) 1226 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg), 1227 tb, NETCONFA_MAX, 1228 devconf_mpls_policy, extack); 1229 1230 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg), 1231 tb, NETCONFA_MAX, 1232 devconf_mpls_policy, extack); 1233 if (err) 1234 return err; 1235 1236 for (i = 0; i <= NETCONFA_MAX; i++) { 1237 if (!tb[i]) 1238 continue; 1239 1240 switch (i) { 1241 case NETCONFA_IFINDEX: 1242 break; 1243 default: 1244 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request"); 1245 return -EINVAL; 1246 } 1247 } 1248 1249 return 0; 1250 } 1251 1252 static int mpls_netconf_get_devconf(struct sk_buff *in_skb, 1253 struct nlmsghdr *nlh, 1254 struct netlink_ext_ack *extack) 1255 { 1256 struct net *net = sock_net(in_skb->sk); 1257 struct nlattr *tb[NETCONFA_MAX + 1]; 1258 struct net_device *dev; 1259 struct mpls_dev *mdev; 1260 struct sk_buff *skb; 1261 int ifindex; 1262 int err; 1263 1264 err = mpls_netconf_valid_get_req(in_skb, nlh, tb, extack); 1265 if (err < 0) 1266 goto errout; 1267 1268 err = -EINVAL; 1269 if (!tb[NETCONFA_IFINDEX]) 1270 goto errout; 1271 1272 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 1273 dev = __dev_get_by_index(net, ifindex); 1274 if (!dev) 1275 goto errout; 1276 1277 mdev = mpls_dev_get(dev); 1278 if (!mdev) 1279 goto errout; 1280 1281 err = -ENOBUFS; 1282 skb = nlmsg_new(mpls_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL); 1283 if (!skb) 1284 goto errout; 1285 1286 err = mpls_netconf_fill_devconf(skb, mdev, 1287 NETLINK_CB(in_skb).portid, 1288 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 1289 NETCONFA_ALL); 1290 if (err < 0) { 1291 /* -EMSGSIZE implies BUG in mpls_netconf_msgsize_devconf() */ 1292 WARN_ON(err == -EMSGSIZE); 1293 kfree_skb(skb); 1294 goto errout; 1295 } 1296 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 1297 errout: 1298 return err; 1299 } 1300 1301 static int mpls_netconf_dump_devconf(struct sk_buff *skb, 1302 struct netlink_callback *cb) 1303 { 1304 const struct nlmsghdr *nlh = cb->nlh; 1305 struct net *net = sock_net(skb->sk); 1306 struct { 1307 unsigned long ifindex; 1308 } *ctx = (void *)cb->ctx; 1309 struct net_device *dev; 1310 struct mpls_dev *mdev; 1311 int err = 0; 1312 1313 if (cb->strict_check) { 1314 struct netlink_ext_ack *extack = cb->extack; 1315 struct netconfmsg *ncm; 1316 1317 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) { 1318 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request"); 1319 return -EINVAL; 1320 } 1321 1322 if (nlmsg_attrlen(nlh, sizeof(*ncm))) { 1323 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request"); 1324 return -EINVAL; 1325 } 1326 } 1327 1328 rcu_read_lock(); 1329 for_each_netdev_dump(net, dev, ctx->ifindex) { 1330 mdev = mpls_dev_get(dev); 1331 if (!mdev) 1332 continue; 1333 err = mpls_netconf_fill_devconf(skb, mdev, 1334 NETLINK_CB(cb->skb).portid, 1335 nlh->nlmsg_seq, 1336 RTM_NEWNETCONF, 1337 NLM_F_MULTI, 1338 NETCONFA_ALL); 1339 if (err < 0) 1340 break; 1341 } 1342 rcu_read_unlock(); 1343 1344 return err; 1345 } 1346 1347 #define MPLS_PERDEV_SYSCTL_OFFSET(field) \ 1348 (&((struct mpls_dev *)0)->field) 1349 1350 static int mpls_conf_proc(struct ctl_table *ctl, int write, 1351 void *buffer, size_t *lenp, loff_t *ppos) 1352 { 1353 int oval = *(int *)ctl->data; 1354 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 1355 1356 if (write) { 1357 struct mpls_dev *mdev = ctl->extra1; 1358 int i = (int *)ctl->data - (int *)mdev; 1359 struct net *net = ctl->extra2; 1360 int val = *(int *)ctl->data; 1361 1362 if (i == offsetof(struct mpls_dev, input_enabled) && 1363 val != oval) { 1364 mpls_netconf_notify_devconf(net, RTM_NEWNETCONF, 1365 NETCONFA_INPUT, mdev); 1366 } 1367 } 1368 1369 return ret; 1370 } 1371 1372 static const struct ctl_table mpls_dev_table[] = { 1373 { 1374 .procname = "input", 1375 .maxlen = sizeof(int), 1376 .mode = 0644, 1377 .proc_handler = mpls_conf_proc, 1378 .data = MPLS_PERDEV_SYSCTL_OFFSET(input_enabled), 1379 }, 1380 }; 1381 1382 static int mpls_dev_sysctl_register(struct net_device *dev, 1383 struct mpls_dev *mdev) 1384 { 1385 char path[sizeof("net/mpls/conf/") + IFNAMSIZ]; 1386 size_t table_size = ARRAY_SIZE(mpls_dev_table); 1387 struct net *net = dev_net(dev); 1388 struct ctl_table *table; 1389 int i; 1390 1391 table = kmemdup(&mpls_dev_table, sizeof(mpls_dev_table), GFP_KERNEL); 1392 if (!table) 1393 goto out; 1394 1395 /* Table data contains only offsets relative to the base of 1396 * the mdev at this point, so make them absolute. 1397 */ 1398 for (i = 0; i < table_size; i++) { 1399 table[i].data = (char *)mdev + (uintptr_t)table[i].data; 1400 table[i].extra1 = mdev; 1401 table[i].extra2 = net; 1402 } 1403 1404 snprintf(path, sizeof(path), "net/mpls/conf/%s", dev->name); 1405 1406 mdev->sysctl = register_net_sysctl_sz(net, path, table, table_size); 1407 if (!mdev->sysctl) 1408 goto free; 1409 1410 mpls_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, mdev); 1411 return 0; 1412 1413 free: 1414 kfree(table); 1415 out: 1416 mdev->sysctl = NULL; 1417 return -ENOBUFS; 1418 } 1419 1420 static void mpls_dev_sysctl_unregister(struct net_device *dev, 1421 struct mpls_dev *mdev) 1422 { 1423 struct net *net = dev_net(dev); 1424 const struct ctl_table *table; 1425 1426 if (!mdev->sysctl) 1427 return; 1428 1429 table = mdev->sysctl->ctl_table_arg; 1430 unregister_net_sysctl_table(mdev->sysctl); 1431 kfree(table); 1432 1433 mpls_netconf_notify_devconf(net, RTM_DELNETCONF, 0, mdev); 1434 } 1435 1436 static struct mpls_dev *mpls_add_dev(struct net_device *dev) 1437 { 1438 struct mpls_dev *mdev; 1439 int err = -ENOMEM; 1440 int i; 1441 1442 ASSERT_RTNL(); 1443 1444 mdev = kzalloc(sizeof(*mdev), GFP_KERNEL); 1445 if (!mdev) 1446 return ERR_PTR(err); 1447 1448 mdev->stats = alloc_percpu(struct mpls_pcpu_stats); 1449 if (!mdev->stats) 1450 goto free; 1451 1452 for_each_possible_cpu(i) { 1453 struct mpls_pcpu_stats *mpls_stats; 1454 1455 mpls_stats = per_cpu_ptr(mdev->stats, i); 1456 u64_stats_init(&mpls_stats->syncp); 1457 } 1458 1459 mdev->dev = dev; 1460 1461 err = mpls_dev_sysctl_register(dev, mdev); 1462 if (err) 1463 goto free; 1464 1465 rcu_assign_pointer(dev->mpls_ptr, mdev); 1466 1467 return mdev; 1468 1469 free: 1470 free_percpu(mdev->stats); 1471 kfree(mdev); 1472 return ERR_PTR(err); 1473 } 1474 1475 static void mpls_dev_destroy_rcu(struct rcu_head *head) 1476 { 1477 struct mpls_dev *mdev = container_of(head, struct mpls_dev, rcu); 1478 1479 free_percpu(mdev->stats); 1480 kfree(mdev); 1481 } 1482 1483 static int mpls_ifdown(struct net_device *dev, int event) 1484 { 1485 struct mpls_route __rcu **platform_label; 1486 struct net *net = dev_net(dev); 1487 unsigned index; 1488 1489 platform_label = rtnl_dereference(net->mpls.platform_label); 1490 for (index = 0; index < net->mpls.platform_labels; index++) { 1491 struct mpls_route *rt = rtnl_dereference(platform_label[index]); 1492 bool nh_del = false; 1493 u8 alive = 0; 1494 1495 if (!rt) 1496 continue; 1497 1498 if (event == NETDEV_UNREGISTER) { 1499 u8 deleted = 0; 1500 1501 for_nexthops(rt) { 1502 if (!nh->nh_dev || nh->nh_dev == dev) 1503 deleted++; 1504 if (nh->nh_dev == dev) 1505 nh_del = true; 1506 } endfor_nexthops(rt); 1507 1508 /* if there are no more nexthops, delete the route */ 1509 if (deleted == rt->rt_nhn) { 1510 mpls_route_update(net, index, NULL, NULL); 1511 continue; 1512 } 1513 1514 if (nh_del) { 1515 size_t size = sizeof(*rt) + rt->rt_nhn * 1516 rt->rt_nh_size; 1517 struct mpls_route *orig = rt; 1518 1519 rt = kmemdup(orig, size, GFP_KERNEL); 1520 if (!rt) 1521 return -ENOMEM; 1522 } 1523 } 1524 1525 change_nexthops(rt) { 1526 unsigned int nh_flags = nh->nh_flags; 1527 1528 if (nh->nh_dev != dev) 1529 goto next; 1530 1531 switch (event) { 1532 case NETDEV_DOWN: 1533 case NETDEV_UNREGISTER: 1534 nh_flags |= RTNH_F_DEAD; 1535 fallthrough; 1536 case NETDEV_CHANGE: 1537 nh_flags |= RTNH_F_LINKDOWN; 1538 break; 1539 } 1540 if (event == NETDEV_UNREGISTER) 1541 nh->nh_dev = NULL; 1542 1543 if (nh->nh_flags != nh_flags) 1544 WRITE_ONCE(nh->nh_flags, nh_flags); 1545 next: 1546 if (!(nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN))) 1547 alive++; 1548 } endfor_nexthops(rt); 1549 1550 WRITE_ONCE(rt->rt_nhn_alive, alive); 1551 1552 if (nh_del) 1553 mpls_route_update(net, index, rt, NULL); 1554 } 1555 1556 return 0; 1557 } 1558 1559 static void mpls_ifup(struct net_device *dev, unsigned int flags) 1560 { 1561 struct mpls_route __rcu **platform_label; 1562 struct net *net = dev_net(dev); 1563 unsigned index; 1564 u8 alive; 1565 1566 platform_label = rtnl_dereference(net->mpls.platform_label); 1567 for (index = 0; index < net->mpls.platform_labels; index++) { 1568 struct mpls_route *rt = rtnl_dereference(platform_label[index]); 1569 1570 if (!rt) 1571 continue; 1572 1573 alive = 0; 1574 change_nexthops(rt) { 1575 unsigned int nh_flags = nh->nh_flags; 1576 1577 if (!(nh_flags & flags)) { 1578 alive++; 1579 continue; 1580 } 1581 if (nh->nh_dev != dev) 1582 continue; 1583 alive++; 1584 nh_flags &= ~flags; 1585 WRITE_ONCE(nh->nh_flags, nh_flags); 1586 } endfor_nexthops(rt); 1587 1588 WRITE_ONCE(rt->rt_nhn_alive, alive); 1589 } 1590 } 1591 1592 static int mpls_dev_notify(struct notifier_block *this, unsigned long event, 1593 void *ptr) 1594 { 1595 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1596 struct mpls_dev *mdev; 1597 unsigned int flags; 1598 int err; 1599 1600 if (event == NETDEV_REGISTER) { 1601 mdev = mpls_add_dev(dev); 1602 if (IS_ERR(mdev)) 1603 return notifier_from_errno(PTR_ERR(mdev)); 1604 1605 return NOTIFY_OK; 1606 } 1607 1608 mdev = mpls_dev_get(dev); 1609 if (!mdev) 1610 return NOTIFY_OK; 1611 1612 switch (event) { 1613 1614 case NETDEV_DOWN: 1615 err = mpls_ifdown(dev, event); 1616 if (err) 1617 return notifier_from_errno(err); 1618 break; 1619 case NETDEV_UP: 1620 flags = dev_get_flags(dev); 1621 if (flags & (IFF_RUNNING | IFF_LOWER_UP)) 1622 mpls_ifup(dev, RTNH_F_DEAD | RTNH_F_LINKDOWN); 1623 else 1624 mpls_ifup(dev, RTNH_F_DEAD); 1625 break; 1626 case NETDEV_CHANGE: 1627 flags = dev_get_flags(dev); 1628 if (flags & (IFF_RUNNING | IFF_LOWER_UP)) { 1629 mpls_ifup(dev, RTNH_F_DEAD | RTNH_F_LINKDOWN); 1630 } else { 1631 err = mpls_ifdown(dev, event); 1632 if (err) 1633 return notifier_from_errno(err); 1634 } 1635 break; 1636 case NETDEV_UNREGISTER: 1637 err = mpls_ifdown(dev, event); 1638 if (err) 1639 return notifier_from_errno(err); 1640 mdev = mpls_dev_get(dev); 1641 if (mdev) { 1642 mpls_dev_sysctl_unregister(dev, mdev); 1643 RCU_INIT_POINTER(dev->mpls_ptr, NULL); 1644 call_rcu(&mdev->rcu, mpls_dev_destroy_rcu); 1645 } 1646 break; 1647 case NETDEV_CHANGENAME: 1648 mdev = mpls_dev_get(dev); 1649 if (mdev) { 1650 mpls_dev_sysctl_unregister(dev, mdev); 1651 err = mpls_dev_sysctl_register(dev, mdev); 1652 if (err) 1653 return notifier_from_errno(err); 1654 } 1655 break; 1656 } 1657 return NOTIFY_OK; 1658 } 1659 1660 static struct notifier_block mpls_dev_notifier = { 1661 .notifier_call = mpls_dev_notify, 1662 }; 1663 1664 static int nla_put_via(struct sk_buff *skb, 1665 u8 table, const void *addr, int alen) 1666 { 1667 static const int table_to_family[NEIGH_NR_TABLES + 1] = { 1668 AF_INET, AF_INET6, AF_DECnet, AF_PACKET, 1669 }; 1670 struct nlattr *nla; 1671 struct rtvia *via; 1672 int family = AF_UNSPEC; 1673 1674 nla = nla_reserve(skb, RTA_VIA, alen + 2); 1675 if (!nla) 1676 return -EMSGSIZE; 1677 1678 if (table <= NEIGH_NR_TABLES) 1679 family = table_to_family[table]; 1680 1681 via = nla_data(nla); 1682 via->rtvia_family = family; 1683 memcpy(via->rtvia_addr, addr, alen); 1684 return 0; 1685 } 1686 1687 int nla_put_labels(struct sk_buff *skb, int attrtype, 1688 u8 labels, const u32 label[]) 1689 { 1690 struct nlattr *nla; 1691 struct mpls_shim_hdr *nla_label; 1692 bool bos; 1693 int i; 1694 nla = nla_reserve(skb, attrtype, labels*4); 1695 if (!nla) 1696 return -EMSGSIZE; 1697 1698 nla_label = nla_data(nla); 1699 bos = true; 1700 for (i = labels - 1; i >= 0; i--) { 1701 nla_label[i] = mpls_entry_encode(label[i], 0, 0, bos); 1702 bos = false; 1703 } 1704 1705 return 0; 1706 } 1707 EXPORT_SYMBOL_GPL(nla_put_labels); 1708 1709 int nla_get_labels(const struct nlattr *nla, u8 max_labels, u8 *labels, 1710 u32 label[], struct netlink_ext_ack *extack) 1711 { 1712 unsigned len = nla_len(nla); 1713 struct mpls_shim_hdr *nla_label; 1714 u8 nla_labels; 1715 bool bos; 1716 int i; 1717 1718 /* len needs to be an even multiple of 4 (the label size). Number 1719 * of labels is a u8 so check for overflow. 1720 */ 1721 if (len & 3 || len / 4 > 255) { 1722 NL_SET_ERR_MSG_ATTR(extack, nla, 1723 "Invalid length for labels attribute"); 1724 return -EINVAL; 1725 } 1726 1727 /* Limit the number of new labels allowed */ 1728 nla_labels = len/4; 1729 if (nla_labels > max_labels) { 1730 NL_SET_ERR_MSG(extack, "Too many labels"); 1731 return -EINVAL; 1732 } 1733 1734 /* when label == NULL, caller wants number of labels */ 1735 if (!label) 1736 goto out; 1737 1738 nla_label = nla_data(nla); 1739 bos = true; 1740 for (i = nla_labels - 1; i >= 0; i--, bos = false) { 1741 struct mpls_entry_decoded dec; 1742 dec = mpls_entry_decode(nla_label + i); 1743 1744 /* Ensure the bottom of stack flag is properly set 1745 * and ttl and tc are both clear. 1746 */ 1747 if (dec.ttl) { 1748 NL_SET_ERR_MSG_ATTR(extack, nla, 1749 "TTL in label must be 0"); 1750 return -EINVAL; 1751 } 1752 1753 if (dec.tc) { 1754 NL_SET_ERR_MSG_ATTR(extack, nla, 1755 "Traffic class in label must be 0"); 1756 return -EINVAL; 1757 } 1758 1759 if (dec.bos != bos) { 1760 NL_SET_BAD_ATTR(extack, nla); 1761 if (bos) { 1762 NL_SET_ERR_MSG(extack, 1763 "BOS bit must be set in first label"); 1764 } else { 1765 NL_SET_ERR_MSG(extack, 1766 "BOS bit can only be set in first label"); 1767 } 1768 return -EINVAL; 1769 } 1770 1771 switch (dec.label) { 1772 case MPLS_LABEL_IMPLNULL: 1773 /* RFC3032: This is a label that an LSR may 1774 * assign and distribute, but which never 1775 * actually appears in the encapsulation. 1776 */ 1777 NL_SET_ERR_MSG_ATTR(extack, nla, 1778 "Implicit NULL Label (3) can not be used in encapsulation"); 1779 return -EINVAL; 1780 } 1781 1782 label[i] = dec.label; 1783 } 1784 out: 1785 *labels = nla_labels; 1786 return 0; 1787 } 1788 EXPORT_SYMBOL_GPL(nla_get_labels); 1789 1790 static int rtm_to_route_config(struct sk_buff *skb, 1791 struct nlmsghdr *nlh, 1792 struct mpls_route_config *cfg, 1793 struct netlink_ext_ack *extack) 1794 { 1795 struct rtmsg *rtm; 1796 struct nlattr *tb[RTA_MAX+1]; 1797 int index; 1798 int err; 1799 1800 err = nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX, 1801 rtm_mpls_policy, extack); 1802 if (err < 0) 1803 goto errout; 1804 1805 err = -EINVAL; 1806 rtm = nlmsg_data(nlh); 1807 1808 if (rtm->rtm_family != AF_MPLS) { 1809 NL_SET_ERR_MSG(extack, "Invalid address family in rtmsg"); 1810 goto errout; 1811 } 1812 if (rtm->rtm_dst_len != 20) { 1813 NL_SET_ERR_MSG(extack, "rtm_dst_len must be 20 for MPLS"); 1814 goto errout; 1815 } 1816 if (rtm->rtm_src_len != 0) { 1817 NL_SET_ERR_MSG(extack, "rtm_src_len must be 0 for MPLS"); 1818 goto errout; 1819 } 1820 if (rtm->rtm_tos != 0) { 1821 NL_SET_ERR_MSG(extack, "rtm_tos must be 0 for MPLS"); 1822 goto errout; 1823 } 1824 if (rtm->rtm_table != RT_TABLE_MAIN) { 1825 NL_SET_ERR_MSG(extack, 1826 "MPLS only supports the main route table"); 1827 goto errout; 1828 } 1829 /* Any value is acceptable for rtm_protocol */ 1830 1831 /* As mpls uses destination specific addresses 1832 * (or source specific address in the case of multicast) 1833 * all addresses have universal scope. 1834 */ 1835 if (rtm->rtm_scope != RT_SCOPE_UNIVERSE) { 1836 NL_SET_ERR_MSG(extack, 1837 "Invalid route scope - MPLS only supports UNIVERSE"); 1838 goto errout; 1839 } 1840 if (rtm->rtm_type != RTN_UNICAST) { 1841 NL_SET_ERR_MSG(extack, 1842 "Invalid route type - MPLS only supports UNICAST"); 1843 goto errout; 1844 } 1845 if (rtm->rtm_flags != 0) { 1846 NL_SET_ERR_MSG(extack, "rtm_flags must be 0 for MPLS"); 1847 goto errout; 1848 } 1849 1850 cfg->rc_label = LABEL_NOT_SPECIFIED; 1851 cfg->rc_protocol = rtm->rtm_protocol; 1852 cfg->rc_via_table = MPLS_NEIGH_TABLE_UNSPEC; 1853 cfg->rc_ttl_propagate = MPLS_TTL_PROP_DEFAULT; 1854 cfg->rc_nlflags = nlh->nlmsg_flags; 1855 cfg->rc_nlinfo.portid = NETLINK_CB(skb).portid; 1856 cfg->rc_nlinfo.nlh = nlh; 1857 cfg->rc_nlinfo.nl_net = sock_net(skb->sk); 1858 1859 for (index = 0; index <= RTA_MAX; index++) { 1860 struct nlattr *nla = tb[index]; 1861 if (!nla) 1862 continue; 1863 1864 switch (index) { 1865 case RTA_OIF: 1866 cfg->rc_ifindex = nla_get_u32(nla); 1867 break; 1868 case RTA_NEWDST: 1869 if (nla_get_labels(nla, MAX_NEW_LABELS, 1870 &cfg->rc_output_labels, 1871 cfg->rc_output_label, extack)) 1872 goto errout; 1873 break; 1874 case RTA_DST: 1875 { 1876 u8 label_count; 1877 if (nla_get_labels(nla, 1, &label_count, 1878 &cfg->rc_label, extack)) 1879 goto errout; 1880 1881 if (!mpls_label_ok(cfg->rc_nlinfo.nl_net, 1882 &cfg->rc_label, extack)) 1883 goto errout; 1884 break; 1885 } 1886 case RTA_GATEWAY: 1887 NL_SET_ERR_MSG(extack, "MPLS does not support RTA_GATEWAY attribute"); 1888 goto errout; 1889 case RTA_VIA: 1890 { 1891 if (nla_get_via(nla, &cfg->rc_via_alen, 1892 &cfg->rc_via_table, cfg->rc_via, 1893 extack)) 1894 goto errout; 1895 break; 1896 } 1897 case RTA_MULTIPATH: 1898 { 1899 cfg->rc_mp = nla_data(nla); 1900 cfg->rc_mp_len = nla_len(nla); 1901 break; 1902 } 1903 case RTA_TTL_PROPAGATE: 1904 { 1905 u8 ttl_propagate = nla_get_u8(nla); 1906 1907 if (ttl_propagate > 1) { 1908 NL_SET_ERR_MSG_ATTR(extack, nla, 1909 "RTA_TTL_PROPAGATE can only be 0 or 1"); 1910 goto errout; 1911 } 1912 cfg->rc_ttl_propagate = ttl_propagate ? 1913 MPLS_TTL_PROP_ENABLED : 1914 MPLS_TTL_PROP_DISABLED; 1915 break; 1916 } 1917 default: 1918 NL_SET_ERR_MSG_ATTR(extack, nla, "Unknown attribute"); 1919 /* Unsupported attribute */ 1920 goto errout; 1921 } 1922 } 1923 1924 err = 0; 1925 errout: 1926 return err; 1927 } 1928 1929 static int mpls_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, 1930 struct netlink_ext_ack *extack) 1931 { 1932 struct mpls_route_config *cfg; 1933 int err; 1934 1935 cfg = kzalloc(sizeof(*cfg), GFP_KERNEL); 1936 if (!cfg) 1937 return -ENOMEM; 1938 1939 err = rtm_to_route_config(skb, nlh, cfg, extack); 1940 if (err < 0) 1941 goto out; 1942 1943 err = mpls_route_del(cfg, extack); 1944 out: 1945 kfree(cfg); 1946 1947 return err; 1948 } 1949 1950 1951 static int mpls_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, 1952 struct netlink_ext_ack *extack) 1953 { 1954 struct mpls_route_config *cfg; 1955 int err; 1956 1957 cfg = kzalloc(sizeof(*cfg), GFP_KERNEL); 1958 if (!cfg) 1959 return -ENOMEM; 1960 1961 err = rtm_to_route_config(skb, nlh, cfg, extack); 1962 if (err < 0) 1963 goto out; 1964 1965 err = mpls_route_add(cfg, extack); 1966 out: 1967 kfree(cfg); 1968 1969 return err; 1970 } 1971 1972 static int mpls_dump_route(struct sk_buff *skb, u32 portid, u32 seq, int event, 1973 u32 label, struct mpls_route *rt, int flags) 1974 { 1975 struct net_device *dev; 1976 struct nlmsghdr *nlh; 1977 struct rtmsg *rtm; 1978 1979 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*rtm), flags); 1980 if (nlh == NULL) 1981 return -EMSGSIZE; 1982 1983 rtm = nlmsg_data(nlh); 1984 rtm->rtm_family = AF_MPLS; 1985 rtm->rtm_dst_len = 20; 1986 rtm->rtm_src_len = 0; 1987 rtm->rtm_tos = 0; 1988 rtm->rtm_table = RT_TABLE_MAIN; 1989 rtm->rtm_protocol = rt->rt_protocol; 1990 rtm->rtm_scope = RT_SCOPE_UNIVERSE; 1991 rtm->rtm_type = RTN_UNICAST; 1992 rtm->rtm_flags = 0; 1993 1994 if (nla_put_labels(skb, RTA_DST, 1, &label)) 1995 goto nla_put_failure; 1996 1997 if (rt->rt_ttl_propagate != MPLS_TTL_PROP_DEFAULT) { 1998 bool ttl_propagate = 1999 rt->rt_ttl_propagate == MPLS_TTL_PROP_ENABLED; 2000 2001 if (nla_put_u8(skb, RTA_TTL_PROPAGATE, 2002 ttl_propagate)) 2003 goto nla_put_failure; 2004 } 2005 if (rt->rt_nhn == 1) { 2006 const struct mpls_nh *nh = rt->rt_nh; 2007 2008 if (nh->nh_labels && 2009 nla_put_labels(skb, RTA_NEWDST, nh->nh_labels, 2010 nh->nh_label)) 2011 goto nla_put_failure; 2012 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC && 2013 nla_put_via(skb, nh->nh_via_table, mpls_nh_via(rt, nh), 2014 nh->nh_via_alen)) 2015 goto nla_put_failure; 2016 dev = nh->nh_dev; 2017 if (dev && nla_put_u32(skb, RTA_OIF, dev->ifindex)) 2018 goto nla_put_failure; 2019 if (nh->nh_flags & RTNH_F_LINKDOWN) 2020 rtm->rtm_flags |= RTNH_F_LINKDOWN; 2021 if (nh->nh_flags & RTNH_F_DEAD) 2022 rtm->rtm_flags |= RTNH_F_DEAD; 2023 } else { 2024 struct rtnexthop *rtnh; 2025 struct nlattr *mp; 2026 u8 linkdown = 0; 2027 u8 dead = 0; 2028 2029 mp = nla_nest_start_noflag(skb, RTA_MULTIPATH); 2030 if (!mp) 2031 goto nla_put_failure; 2032 2033 for_nexthops(rt) { 2034 dev = nh->nh_dev; 2035 if (!dev) 2036 continue; 2037 2038 rtnh = nla_reserve_nohdr(skb, sizeof(*rtnh)); 2039 if (!rtnh) 2040 goto nla_put_failure; 2041 2042 rtnh->rtnh_ifindex = dev->ifindex; 2043 if (nh->nh_flags & RTNH_F_LINKDOWN) { 2044 rtnh->rtnh_flags |= RTNH_F_LINKDOWN; 2045 linkdown++; 2046 } 2047 if (nh->nh_flags & RTNH_F_DEAD) { 2048 rtnh->rtnh_flags |= RTNH_F_DEAD; 2049 dead++; 2050 } 2051 2052 if (nh->nh_labels && nla_put_labels(skb, RTA_NEWDST, 2053 nh->nh_labels, 2054 nh->nh_label)) 2055 goto nla_put_failure; 2056 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC && 2057 nla_put_via(skb, nh->nh_via_table, 2058 mpls_nh_via(rt, nh), 2059 nh->nh_via_alen)) 2060 goto nla_put_failure; 2061 2062 /* length of rtnetlink header + attributes */ 2063 rtnh->rtnh_len = nlmsg_get_pos(skb) - (void *)rtnh; 2064 } endfor_nexthops(rt); 2065 2066 if (linkdown == rt->rt_nhn) 2067 rtm->rtm_flags |= RTNH_F_LINKDOWN; 2068 if (dead == rt->rt_nhn) 2069 rtm->rtm_flags |= RTNH_F_DEAD; 2070 2071 nla_nest_end(skb, mp); 2072 } 2073 2074 nlmsg_end(skb, nlh); 2075 return 0; 2076 2077 nla_put_failure: 2078 nlmsg_cancel(skb, nlh); 2079 return -EMSGSIZE; 2080 } 2081 2082 #if IS_ENABLED(CONFIG_INET) 2083 static int mpls_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh, 2084 struct fib_dump_filter *filter, 2085 struct netlink_callback *cb) 2086 { 2087 return ip_valid_fib_dump_req(net, nlh, filter, cb); 2088 } 2089 #else 2090 static int mpls_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh, 2091 struct fib_dump_filter *filter, 2092 struct netlink_callback *cb) 2093 { 2094 struct netlink_ext_ack *extack = cb->extack; 2095 struct nlattr *tb[RTA_MAX + 1]; 2096 struct rtmsg *rtm; 2097 int err, i; 2098 2099 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) { 2100 NL_SET_ERR_MSG_MOD(extack, "Invalid header for FIB dump request"); 2101 return -EINVAL; 2102 } 2103 2104 rtm = nlmsg_data(nlh); 2105 if (rtm->rtm_dst_len || rtm->rtm_src_len || rtm->rtm_tos || 2106 rtm->rtm_table || rtm->rtm_scope || rtm->rtm_type || 2107 rtm->rtm_flags) { 2108 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for FIB dump request"); 2109 return -EINVAL; 2110 } 2111 2112 if (rtm->rtm_protocol) { 2113 filter->protocol = rtm->rtm_protocol; 2114 filter->filter_set = 1; 2115 cb->answer_flags = NLM_F_DUMP_FILTERED; 2116 } 2117 2118 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX, 2119 rtm_mpls_policy, extack); 2120 if (err < 0) 2121 return err; 2122 2123 for (i = 0; i <= RTA_MAX; ++i) { 2124 int ifindex; 2125 2126 if (i == RTA_OIF) { 2127 ifindex = nla_get_u32(tb[i]); 2128 filter->dev = __dev_get_by_index(net, ifindex); 2129 if (!filter->dev) 2130 return -ENODEV; 2131 filter->filter_set = 1; 2132 } else if (tb[i]) { 2133 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request"); 2134 return -EINVAL; 2135 } 2136 } 2137 2138 return 0; 2139 } 2140 #endif 2141 2142 static bool mpls_rt_uses_dev(struct mpls_route *rt, 2143 const struct net_device *dev) 2144 { 2145 if (rt->rt_nhn == 1) { 2146 struct mpls_nh *nh = rt->rt_nh; 2147 2148 if (nh->nh_dev == dev) 2149 return true; 2150 } else { 2151 for_nexthops(rt) { 2152 if (nh->nh_dev == dev) 2153 return true; 2154 } endfor_nexthops(rt); 2155 } 2156 2157 return false; 2158 } 2159 2160 static int mpls_dump_routes(struct sk_buff *skb, struct netlink_callback *cb) 2161 { 2162 const struct nlmsghdr *nlh = cb->nlh; 2163 struct net *net = sock_net(skb->sk); 2164 struct mpls_route __rcu **platform_label; 2165 struct fib_dump_filter filter = { 2166 .rtnl_held = true, 2167 }; 2168 unsigned int flags = NLM_F_MULTI; 2169 size_t platform_labels; 2170 unsigned int index; 2171 2172 ASSERT_RTNL(); 2173 2174 if (cb->strict_check) { 2175 int err; 2176 2177 err = mpls_valid_fib_dump_req(net, nlh, &filter, cb); 2178 if (err < 0) 2179 return err; 2180 2181 /* for MPLS, there is only 1 table with fixed type and flags. 2182 * If either are set in the filter then return nothing. 2183 */ 2184 if ((filter.table_id && filter.table_id != RT_TABLE_MAIN) || 2185 (filter.rt_type && filter.rt_type != RTN_UNICAST) || 2186 filter.flags) 2187 return skb->len; 2188 } 2189 2190 index = cb->args[0]; 2191 if (index < MPLS_LABEL_FIRST_UNRESERVED) 2192 index = MPLS_LABEL_FIRST_UNRESERVED; 2193 2194 platform_label = rtnl_dereference(net->mpls.platform_label); 2195 platform_labels = net->mpls.platform_labels; 2196 2197 if (filter.filter_set) 2198 flags |= NLM_F_DUMP_FILTERED; 2199 2200 for (; index < platform_labels; index++) { 2201 struct mpls_route *rt; 2202 2203 rt = rtnl_dereference(platform_label[index]); 2204 if (!rt) 2205 continue; 2206 2207 if ((filter.dev && !mpls_rt_uses_dev(rt, filter.dev)) || 2208 (filter.protocol && rt->rt_protocol != filter.protocol)) 2209 continue; 2210 2211 if (mpls_dump_route(skb, NETLINK_CB(cb->skb).portid, 2212 cb->nlh->nlmsg_seq, RTM_NEWROUTE, 2213 index, rt, flags) < 0) 2214 break; 2215 } 2216 cb->args[0] = index; 2217 2218 return skb->len; 2219 } 2220 2221 static inline size_t lfib_nlmsg_size(struct mpls_route *rt) 2222 { 2223 size_t payload = 2224 NLMSG_ALIGN(sizeof(struct rtmsg)) 2225 + nla_total_size(4) /* RTA_DST */ 2226 + nla_total_size(1); /* RTA_TTL_PROPAGATE */ 2227 2228 if (rt->rt_nhn == 1) { 2229 struct mpls_nh *nh = rt->rt_nh; 2230 2231 if (nh->nh_dev) 2232 payload += nla_total_size(4); /* RTA_OIF */ 2233 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC) /* RTA_VIA */ 2234 payload += nla_total_size(2 + nh->nh_via_alen); 2235 if (nh->nh_labels) /* RTA_NEWDST */ 2236 payload += nla_total_size(nh->nh_labels * 4); 2237 } else { 2238 /* each nexthop is packed in an attribute */ 2239 size_t nhsize = 0; 2240 2241 for_nexthops(rt) { 2242 if (!nh->nh_dev) 2243 continue; 2244 nhsize += nla_total_size(sizeof(struct rtnexthop)); 2245 /* RTA_VIA */ 2246 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC) 2247 nhsize += nla_total_size(2 + nh->nh_via_alen); 2248 if (nh->nh_labels) 2249 nhsize += nla_total_size(nh->nh_labels * 4); 2250 } endfor_nexthops(rt); 2251 /* nested attribute */ 2252 payload += nla_total_size(nhsize); 2253 } 2254 2255 return payload; 2256 } 2257 2258 static void rtmsg_lfib(int event, u32 label, struct mpls_route *rt, 2259 struct nlmsghdr *nlh, struct net *net, u32 portid, 2260 unsigned int nlm_flags) 2261 { 2262 struct sk_buff *skb; 2263 u32 seq = nlh ? nlh->nlmsg_seq : 0; 2264 int err = -ENOBUFS; 2265 2266 skb = nlmsg_new(lfib_nlmsg_size(rt), GFP_KERNEL); 2267 if (skb == NULL) 2268 goto errout; 2269 2270 err = mpls_dump_route(skb, portid, seq, event, label, rt, nlm_flags); 2271 if (err < 0) { 2272 /* -EMSGSIZE implies BUG in lfib_nlmsg_size */ 2273 WARN_ON(err == -EMSGSIZE); 2274 kfree_skb(skb); 2275 goto errout; 2276 } 2277 rtnl_notify(skb, net, portid, RTNLGRP_MPLS_ROUTE, nlh, GFP_KERNEL); 2278 2279 return; 2280 errout: 2281 if (err < 0) 2282 rtnl_set_sk_err(net, RTNLGRP_MPLS_ROUTE, err); 2283 } 2284 2285 static int mpls_valid_getroute_req(struct sk_buff *skb, 2286 const struct nlmsghdr *nlh, 2287 struct nlattr **tb, 2288 struct netlink_ext_ack *extack) 2289 { 2290 struct rtmsg *rtm; 2291 int i, err; 2292 2293 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) { 2294 NL_SET_ERR_MSG_MOD(extack, 2295 "Invalid header for get route request"); 2296 return -EINVAL; 2297 } 2298 2299 if (!netlink_strict_get_check(skb)) 2300 return nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX, 2301 rtm_mpls_policy, extack); 2302 2303 rtm = nlmsg_data(nlh); 2304 if ((rtm->rtm_dst_len && rtm->rtm_dst_len != 20) || 2305 rtm->rtm_src_len || rtm->rtm_tos || rtm->rtm_table || 2306 rtm->rtm_protocol || rtm->rtm_scope || rtm->rtm_type) { 2307 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get route request"); 2308 return -EINVAL; 2309 } 2310 if (rtm->rtm_flags & ~RTM_F_FIB_MATCH) { 2311 NL_SET_ERR_MSG_MOD(extack, 2312 "Invalid flags for get route request"); 2313 return -EINVAL; 2314 } 2315 2316 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX, 2317 rtm_mpls_policy, extack); 2318 if (err) 2319 return err; 2320 2321 if ((tb[RTA_DST] || tb[RTA_NEWDST]) && !rtm->rtm_dst_len) { 2322 NL_SET_ERR_MSG_MOD(extack, "rtm_dst_len must be 20 for MPLS"); 2323 return -EINVAL; 2324 } 2325 2326 for (i = 0; i <= RTA_MAX; i++) { 2327 if (!tb[i]) 2328 continue; 2329 2330 switch (i) { 2331 case RTA_DST: 2332 case RTA_NEWDST: 2333 break; 2334 default: 2335 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get route request"); 2336 return -EINVAL; 2337 } 2338 } 2339 2340 return 0; 2341 } 2342 2343 static int mpls_getroute(struct sk_buff *in_skb, struct nlmsghdr *in_nlh, 2344 struct netlink_ext_ack *extack) 2345 { 2346 struct net *net = sock_net(in_skb->sk); 2347 u32 portid = NETLINK_CB(in_skb).portid; 2348 u32 in_label = LABEL_NOT_SPECIFIED; 2349 struct nlattr *tb[RTA_MAX + 1]; 2350 u32 labels[MAX_NEW_LABELS]; 2351 struct mpls_shim_hdr *hdr; 2352 unsigned int hdr_size = 0; 2353 const struct mpls_nh *nh; 2354 struct net_device *dev; 2355 struct mpls_route *rt; 2356 struct rtmsg *rtm, *r; 2357 struct nlmsghdr *nlh; 2358 struct sk_buff *skb; 2359 u8 n_labels; 2360 int err; 2361 2362 err = mpls_valid_getroute_req(in_skb, in_nlh, tb, extack); 2363 if (err < 0) 2364 goto errout; 2365 2366 rtm = nlmsg_data(in_nlh); 2367 2368 if (tb[RTA_DST]) { 2369 u8 label_count; 2370 2371 if (nla_get_labels(tb[RTA_DST], 1, &label_count, 2372 &in_label, extack)) { 2373 err = -EINVAL; 2374 goto errout; 2375 } 2376 2377 if (!mpls_label_ok(net, &in_label, extack)) { 2378 err = -EINVAL; 2379 goto errout; 2380 } 2381 } 2382 2383 rt = mpls_route_input_rcu(net, in_label); 2384 if (!rt) { 2385 err = -ENETUNREACH; 2386 goto errout; 2387 } 2388 2389 if (rtm->rtm_flags & RTM_F_FIB_MATCH) { 2390 skb = nlmsg_new(lfib_nlmsg_size(rt), GFP_KERNEL); 2391 if (!skb) { 2392 err = -ENOBUFS; 2393 goto errout; 2394 } 2395 2396 err = mpls_dump_route(skb, portid, in_nlh->nlmsg_seq, 2397 RTM_NEWROUTE, in_label, rt, 0); 2398 if (err < 0) { 2399 /* -EMSGSIZE implies BUG in lfib_nlmsg_size */ 2400 WARN_ON(err == -EMSGSIZE); 2401 goto errout_free; 2402 } 2403 2404 return rtnl_unicast(skb, net, portid); 2405 } 2406 2407 if (tb[RTA_NEWDST]) { 2408 if (nla_get_labels(tb[RTA_NEWDST], MAX_NEW_LABELS, &n_labels, 2409 labels, extack) != 0) { 2410 err = -EINVAL; 2411 goto errout; 2412 } 2413 2414 hdr_size = n_labels * sizeof(struct mpls_shim_hdr); 2415 } 2416 2417 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); 2418 if (!skb) { 2419 err = -ENOBUFS; 2420 goto errout; 2421 } 2422 2423 skb->protocol = htons(ETH_P_MPLS_UC); 2424 2425 if (hdr_size) { 2426 bool bos; 2427 int i; 2428 2429 if (skb_cow(skb, hdr_size)) { 2430 err = -ENOBUFS; 2431 goto errout_free; 2432 } 2433 2434 skb_reserve(skb, hdr_size); 2435 skb_push(skb, hdr_size); 2436 skb_reset_network_header(skb); 2437 2438 /* Push new labels */ 2439 hdr = mpls_hdr(skb); 2440 bos = true; 2441 for (i = n_labels - 1; i >= 0; i--) { 2442 hdr[i] = mpls_entry_encode(labels[i], 2443 1, 0, bos); 2444 bos = false; 2445 } 2446 } 2447 2448 nh = mpls_select_multipath(rt, skb); 2449 if (!nh) { 2450 err = -ENETUNREACH; 2451 goto errout_free; 2452 } 2453 2454 if (hdr_size) { 2455 skb_pull(skb, hdr_size); 2456 skb_reset_network_header(skb); 2457 } 2458 2459 nlh = nlmsg_put(skb, portid, in_nlh->nlmsg_seq, 2460 RTM_NEWROUTE, sizeof(*r), 0); 2461 if (!nlh) { 2462 err = -EMSGSIZE; 2463 goto errout_free; 2464 } 2465 2466 r = nlmsg_data(nlh); 2467 r->rtm_family = AF_MPLS; 2468 r->rtm_dst_len = 20; 2469 r->rtm_src_len = 0; 2470 r->rtm_table = RT_TABLE_MAIN; 2471 r->rtm_type = RTN_UNICAST; 2472 r->rtm_scope = RT_SCOPE_UNIVERSE; 2473 r->rtm_protocol = rt->rt_protocol; 2474 r->rtm_flags = 0; 2475 2476 if (nla_put_labels(skb, RTA_DST, 1, &in_label)) 2477 goto nla_put_failure; 2478 2479 if (nh->nh_labels && 2480 nla_put_labels(skb, RTA_NEWDST, nh->nh_labels, 2481 nh->nh_label)) 2482 goto nla_put_failure; 2483 2484 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC && 2485 nla_put_via(skb, nh->nh_via_table, mpls_nh_via(rt, nh), 2486 nh->nh_via_alen)) 2487 goto nla_put_failure; 2488 dev = nh->nh_dev; 2489 if (dev && nla_put_u32(skb, RTA_OIF, dev->ifindex)) 2490 goto nla_put_failure; 2491 2492 nlmsg_end(skb, nlh); 2493 2494 err = rtnl_unicast(skb, net, portid); 2495 errout: 2496 return err; 2497 2498 nla_put_failure: 2499 nlmsg_cancel(skb, nlh); 2500 err = -EMSGSIZE; 2501 errout_free: 2502 kfree_skb(skb); 2503 return err; 2504 } 2505 2506 static int resize_platform_label_table(struct net *net, size_t limit) 2507 { 2508 size_t size = sizeof(struct mpls_route *) * limit; 2509 size_t old_limit; 2510 size_t cp_size; 2511 struct mpls_route __rcu **labels = NULL, **old; 2512 struct mpls_route *rt0 = NULL, *rt2 = NULL; 2513 unsigned index; 2514 2515 if (size) { 2516 labels = kvzalloc(size, GFP_KERNEL); 2517 if (!labels) 2518 goto nolabels; 2519 } 2520 2521 /* In case the predefined labels need to be populated */ 2522 if (limit > MPLS_LABEL_IPV4NULL) { 2523 struct net_device *lo = net->loopback_dev; 2524 rt0 = mpls_rt_alloc(1, lo->addr_len, 0); 2525 if (IS_ERR(rt0)) 2526 goto nort0; 2527 rt0->rt_nh->nh_dev = lo; 2528 rt0->rt_protocol = RTPROT_KERNEL; 2529 rt0->rt_payload_type = MPT_IPV4; 2530 rt0->rt_ttl_propagate = MPLS_TTL_PROP_DEFAULT; 2531 rt0->rt_nh->nh_via_table = NEIGH_LINK_TABLE; 2532 rt0->rt_nh->nh_via_alen = lo->addr_len; 2533 memcpy(__mpls_nh_via(rt0, rt0->rt_nh), lo->dev_addr, 2534 lo->addr_len); 2535 } 2536 if (limit > MPLS_LABEL_IPV6NULL) { 2537 struct net_device *lo = net->loopback_dev; 2538 rt2 = mpls_rt_alloc(1, lo->addr_len, 0); 2539 if (IS_ERR(rt2)) 2540 goto nort2; 2541 rt2->rt_nh->nh_dev = lo; 2542 rt2->rt_protocol = RTPROT_KERNEL; 2543 rt2->rt_payload_type = MPT_IPV6; 2544 rt2->rt_ttl_propagate = MPLS_TTL_PROP_DEFAULT; 2545 rt2->rt_nh->nh_via_table = NEIGH_LINK_TABLE; 2546 rt2->rt_nh->nh_via_alen = lo->addr_len; 2547 memcpy(__mpls_nh_via(rt2, rt2->rt_nh), lo->dev_addr, 2548 lo->addr_len); 2549 } 2550 2551 rtnl_lock(); 2552 /* Remember the original table */ 2553 old = rtnl_dereference(net->mpls.platform_label); 2554 old_limit = net->mpls.platform_labels; 2555 2556 /* Free any labels beyond the new table */ 2557 for (index = limit; index < old_limit; index++) 2558 mpls_route_update(net, index, NULL, NULL); 2559 2560 /* Copy over the old labels */ 2561 cp_size = size; 2562 if (old_limit < limit) 2563 cp_size = old_limit * sizeof(struct mpls_route *); 2564 2565 memcpy(labels, old, cp_size); 2566 2567 /* If needed set the predefined labels */ 2568 if ((old_limit <= MPLS_LABEL_IPV6NULL) && 2569 (limit > MPLS_LABEL_IPV6NULL)) { 2570 RCU_INIT_POINTER(labels[MPLS_LABEL_IPV6NULL], rt2); 2571 rt2 = NULL; 2572 } 2573 2574 if ((old_limit <= MPLS_LABEL_IPV4NULL) && 2575 (limit > MPLS_LABEL_IPV4NULL)) { 2576 RCU_INIT_POINTER(labels[MPLS_LABEL_IPV4NULL], rt0); 2577 rt0 = NULL; 2578 } 2579 2580 /* Update the global pointers */ 2581 net->mpls.platform_labels = limit; 2582 rcu_assign_pointer(net->mpls.platform_label, labels); 2583 2584 rtnl_unlock(); 2585 2586 mpls_rt_free(rt2); 2587 mpls_rt_free(rt0); 2588 2589 if (old) { 2590 synchronize_rcu(); 2591 kvfree(old); 2592 } 2593 return 0; 2594 2595 nort2: 2596 mpls_rt_free(rt0); 2597 nort0: 2598 kvfree(labels); 2599 nolabels: 2600 return -ENOMEM; 2601 } 2602 2603 static int mpls_platform_labels(struct ctl_table *table, int write, 2604 void *buffer, size_t *lenp, loff_t *ppos) 2605 { 2606 struct net *net = table->data; 2607 int platform_labels = net->mpls.platform_labels; 2608 int ret; 2609 struct ctl_table tmp = { 2610 .procname = table->procname, 2611 .data = &platform_labels, 2612 .maxlen = sizeof(int), 2613 .mode = table->mode, 2614 .extra1 = SYSCTL_ZERO, 2615 .extra2 = &label_limit, 2616 }; 2617 2618 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); 2619 2620 if (write && ret == 0) 2621 ret = resize_platform_label_table(net, platform_labels); 2622 2623 return ret; 2624 } 2625 2626 #define MPLS_NS_SYSCTL_OFFSET(field) \ 2627 (&((struct net *)0)->field) 2628 2629 static const struct ctl_table mpls_table[] = { 2630 { 2631 .procname = "platform_labels", 2632 .data = NULL, 2633 .maxlen = sizeof(int), 2634 .mode = 0644, 2635 .proc_handler = mpls_platform_labels, 2636 }, 2637 { 2638 .procname = "ip_ttl_propagate", 2639 .data = MPLS_NS_SYSCTL_OFFSET(mpls.ip_ttl_propagate), 2640 .maxlen = sizeof(int), 2641 .mode = 0644, 2642 .proc_handler = proc_dointvec_minmax, 2643 .extra1 = SYSCTL_ZERO, 2644 .extra2 = SYSCTL_ONE, 2645 }, 2646 { 2647 .procname = "default_ttl", 2648 .data = MPLS_NS_SYSCTL_OFFSET(mpls.default_ttl), 2649 .maxlen = sizeof(int), 2650 .mode = 0644, 2651 .proc_handler = proc_dointvec_minmax, 2652 .extra1 = SYSCTL_ONE, 2653 .extra2 = &ttl_max, 2654 }, 2655 }; 2656 2657 static int mpls_net_init(struct net *net) 2658 { 2659 size_t table_size = ARRAY_SIZE(mpls_table); 2660 struct ctl_table *table; 2661 int i; 2662 2663 net->mpls.platform_labels = 0; 2664 net->mpls.platform_label = NULL; 2665 net->mpls.ip_ttl_propagate = 1; 2666 net->mpls.default_ttl = 255; 2667 2668 table = kmemdup(mpls_table, sizeof(mpls_table), GFP_KERNEL); 2669 if (table == NULL) 2670 return -ENOMEM; 2671 2672 /* Table data contains only offsets relative to the base of 2673 * the mdev at this point, so make them absolute. 2674 */ 2675 for (i = 0; i < table_size; i++) 2676 table[i].data = (char *)net + (uintptr_t)table[i].data; 2677 2678 net->mpls.ctl = register_net_sysctl_sz(net, "net/mpls", table, 2679 table_size); 2680 if (net->mpls.ctl == NULL) { 2681 kfree(table); 2682 return -ENOMEM; 2683 } 2684 2685 return 0; 2686 } 2687 2688 static void mpls_net_exit(struct net *net) 2689 { 2690 struct mpls_route __rcu **platform_label; 2691 size_t platform_labels; 2692 const struct ctl_table *table; 2693 unsigned int index; 2694 2695 table = net->mpls.ctl->ctl_table_arg; 2696 unregister_net_sysctl_table(net->mpls.ctl); 2697 kfree(table); 2698 2699 /* An rcu grace period has passed since there was a device in 2700 * the network namespace (and thus the last in flight packet) 2701 * left this network namespace. This is because 2702 * unregister_netdevice_many and netdev_run_todo has completed 2703 * for each network device that was in this network namespace. 2704 * 2705 * As such no additional rcu synchronization is necessary when 2706 * freeing the platform_label table. 2707 */ 2708 rtnl_lock(); 2709 platform_label = rtnl_dereference(net->mpls.platform_label); 2710 platform_labels = net->mpls.platform_labels; 2711 for (index = 0; index < platform_labels; index++) { 2712 struct mpls_route *rt = rtnl_dereference(platform_label[index]); 2713 RCU_INIT_POINTER(platform_label[index], NULL); 2714 mpls_notify_route(net, index, rt, NULL, NULL); 2715 mpls_rt_free(rt); 2716 } 2717 rtnl_unlock(); 2718 2719 kvfree(platform_label); 2720 } 2721 2722 static struct pernet_operations mpls_net_ops = { 2723 .init = mpls_net_init, 2724 .exit = mpls_net_exit, 2725 }; 2726 2727 static struct rtnl_af_ops mpls_af_ops __read_mostly = { 2728 .family = AF_MPLS, 2729 .fill_stats_af = mpls_fill_stats_af, 2730 .get_stats_af_size = mpls_get_stats_af_size, 2731 }; 2732 2733 static int __init mpls_init(void) 2734 { 2735 int err; 2736 2737 BUILD_BUG_ON(sizeof(struct mpls_shim_hdr) != 4); 2738 2739 err = register_pernet_subsys(&mpls_net_ops); 2740 if (err) 2741 goto out; 2742 2743 err = register_netdevice_notifier(&mpls_dev_notifier); 2744 if (err) 2745 goto out_unregister_pernet; 2746 2747 dev_add_pack(&mpls_packet_type); 2748 2749 rtnl_af_register(&mpls_af_ops); 2750 2751 rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_NEWROUTE, 2752 mpls_rtm_newroute, NULL, 0); 2753 rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_DELROUTE, 2754 mpls_rtm_delroute, NULL, 0); 2755 rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_GETROUTE, 2756 mpls_getroute, mpls_dump_routes, 0); 2757 rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_GETNETCONF, 2758 mpls_netconf_get_devconf, 2759 mpls_netconf_dump_devconf, 2760 RTNL_FLAG_DUMP_UNLOCKED); 2761 err = ipgre_tunnel_encap_add_mpls_ops(); 2762 if (err) 2763 pr_err("Can't add mpls over gre tunnel ops\n"); 2764 2765 err = 0; 2766 out: 2767 return err; 2768 2769 out_unregister_pernet: 2770 unregister_pernet_subsys(&mpls_net_ops); 2771 goto out; 2772 } 2773 module_init(mpls_init); 2774 2775 static void __exit mpls_exit(void) 2776 { 2777 rtnl_unregister_all(PF_MPLS); 2778 rtnl_af_unregister(&mpls_af_ops); 2779 dev_remove_pack(&mpls_packet_type); 2780 unregister_netdevice_notifier(&mpls_dev_notifier); 2781 unregister_pernet_subsys(&mpls_net_ops); 2782 ipgre_tunnel_encap_del_mpls_ops(); 2783 } 2784 module_exit(mpls_exit); 2785 2786 MODULE_DESCRIPTION("MultiProtocol Label Switching"); 2787 MODULE_LICENSE("GPL v2"); 2788 MODULE_ALIAS_NETPROTO(PF_MPLS); 2789