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 40 static int label_limit = (1 << 20) - 1; 41 static int ttl_max = 255; 42 43 #if IS_ENABLED(CONFIG_NET_IP_TUNNEL) 44 static size_t ipgre_mpls_encap_hlen(struct ip_tunnel_encap *e) 45 { 46 return sizeof(struct mpls_shim_hdr); 47 } 48 49 static const struct ip_tunnel_encap_ops mpls_iptun_ops = { 50 .encap_hlen = ipgre_mpls_encap_hlen, 51 }; 52 53 static int ipgre_tunnel_encap_add_mpls_ops(void) 54 { 55 return ip_tunnel_encap_add_ops(&mpls_iptun_ops, TUNNEL_ENCAP_MPLS); 56 } 57 58 static void ipgre_tunnel_encap_del_mpls_ops(void) 59 { 60 ip_tunnel_encap_del_ops(&mpls_iptun_ops, TUNNEL_ENCAP_MPLS); 61 } 62 #else 63 static int ipgre_tunnel_encap_add_mpls_ops(void) 64 { 65 return 0; 66 } 67 68 static void ipgre_tunnel_encap_del_mpls_ops(void) 69 { 70 } 71 #endif 72 73 static 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 77 static 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 89 bool mpls_output_possible(const struct net_device *dev) 90 { 91 return dev && (dev->flags & IFF_UP) && netif_carrier_ok(dev); 92 } 93 EXPORT_SYMBOL_GPL(mpls_output_possible); 94 95 static u8 *__mpls_nh_via(struct mpls_route *rt, struct mpls_nh *nh) 96 { 97 return (u8 *)nh + rt->rt_via_offset; 98 } 99 100 static 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 } 105 106 static 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 } 111 112 unsigned 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 } 117 EXPORT_SYMBOL_GPL(mpls_dev_mtu); 118 119 bool 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 } 129 EXPORT_SYMBOL_GPL(mpls_pkt_too_big); 130 131 void 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 } 154 EXPORT_SYMBOL_GPL(mpls_stats_inc_outucastpkts); 155 156 static 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 } 222 223 static 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 */ 233 static 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); 264 265 out: 266 return mpls_get_nexthop(rt, nh_index); 267 } 268 269 static 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 } 340 341 static 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; 464 465 tx_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; 470 err: 471 MPLS_INC_STATS(mdev, rx_errors); 472 drop: 473 kfree_skb(skb); 474 return NET_RX_DROP; 475 } 476 477 static struct packet_type mpls_packet_type __read_mostly = { 478 .type = cpu_to_be16(ETH_P_MPLS_UC), 479 .func = mpls_forward, 480 }; 481 482 static 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 }; 487 488 struct 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 */ 508 static 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 } 529 530 static void mpls_rt_free(struct mpls_route *rt) 531 { 532 if (rt) 533 kfree_rcu(rt, rt_rcu); 534 } 535 536 static 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 } 549 550 static 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 } 568 569 static 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) 586 static 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 606 static 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) 614 static 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 637 static struct net_device *inet6_fib_lookup_dev(struct net *net, 638 const void *addr) 639 { 640 return ERR_PTR(-EAFNOSUPPORT); 641 } 642 #endif 643 644 static 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 } 676 677 static 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; 712 713 errout: 714 return err; 715 } 716 717 static 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; 760 761 errout: 762 return err; 763 } 764 765 static 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; 792 793 errout: 794 return err; 795 } 796 797 static 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; 828 829 errout: 830 return err; 831 } 832 833 static 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 } 881 882 static 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; 932 933 errout: 934 return err; 935 } 936 937 static 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 } 959 960 static 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 1042 freert: 1043 mpls_rt_free(rt); 1044 errout: 1045 return err; 1046 } 1047 1048 static 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; 1063 errout: 1064 return err; 1065 } 1066 1067 static 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(&p->syncp); 1082 local = p->stats; 1083 } while (u64_stats_fetch_retry(&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 1097 static 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 1120 static 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 1131 static 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 1161 nla_put_failure: 1162 nlmsg_cancel(skb, nlh); 1163 return -EMSGSIZE; 1164 } 1165 1166 static 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 1181 static 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; 1201 errout: 1202 if (err < 0) 1203 rtnl_set_sk_err(net, RTNLGRP_MPLS_NETCONF, err); 1204 } 1205 1206 static const struct nla_policy devconf_mpls_policy[NETCONFA_MAX + 1] = { 1207 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 1208 }; 1209 1210 static 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 1250 static 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); 1295 errout: 1296 return err; 1297 } 1298 1299 static 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)); 1349 cont: 1350 idx++; 1351 } 1352 rcu_read_unlock(); 1353 } 1354 done: 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 1364 static 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 1386 static 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 1397 static 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 1427 free: 1428 kfree(table); 1429 out: 1430 return -ENOBUFS; 1431 } 1432 1433 static void mpls_dev_sysctl_unregister(struct net_device *dev, 1434 struct mpls_dev *mdev) 1435 { 1436 struct net *net = dev_net(dev); 1437 struct ctl_table *table; 1438 1439 table = mdev->sysctl->ctl_table_arg; 1440 unregister_net_sysctl_table(mdev->sysctl); 1441 kfree(table); 1442 1443 mpls_netconf_notify_devconf(net, RTM_DELNETCONF, 0, mdev); 1444 } 1445 1446 static struct mpls_dev *mpls_add_dev(struct net_device *dev) 1447 { 1448 struct mpls_dev *mdev; 1449 int err = -ENOMEM; 1450 int i; 1451 1452 ASSERT_RTNL(); 1453 1454 mdev = kzalloc(sizeof(*mdev), GFP_KERNEL); 1455 if (!mdev) 1456 return ERR_PTR(err); 1457 1458 mdev->stats = alloc_percpu(struct mpls_pcpu_stats); 1459 if (!mdev->stats) 1460 goto free; 1461 1462 for_each_possible_cpu(i) { 1463 struct mpls_pcpu_stats *mpls_stats; 1464 1465 mpls_stats = per_cpu_ptr(mdev->stats, i); 1466 u64_stats_init(&mpls_stats->syncp); 1467 } 1468 1469 mdev->dev = dev; 1470 1471 err = mpls_dev_sysctl_register(dev, mdev); 1472 if (err) 1473 goto free; 1474 1475 rcu_assign_pointer(dev->mpls_ptr, mdev); 1476 1477 return mdev; 1478 1479 free: 1480 free_percpu(mdev->stats); 1481 kfree(mdev); 1482 return ERR_PTR(err); 1483 } 1484 1485 static void mpls_dev_destroy_rcu(struct rcu_head *head) 1486 { 1487 struct mpls_dev *mdev = container_of(head, struct mpls_dev, rcu); 1488 1489 free_percpu(mdev->stats); 1490 kfree(mdev); 1491 } 1492 1493 static void mpls_ifdown(struct net_device *dev, int event) 1494 { 1495 struct mpls_route __rcu **platform_label; 1496 struct net *net = dev_net(dev); 1497 u8 alive, deleted; 1498 unsigned index; 1499 1500 platform_label = rtnl_dereference(net->mpls.platform_label); 1501 for (index = 0; index < net->mpls.platform_labels; index++) { 1502 struct mpls_route *rt = rtnl_dereference(platform_label[index]); 1503 1504 if (!rt) 1505 continue; 1506 1507 alive = 0; 1508 deleted = 0; 1509 change_nexthops(rt) { 1510 unsigned int nh_flags = nh->nh_flags; 1511 1512 if (rtnl_dereference(nh->nh_dev) != dev) 1513 goto next; 1514 1515 switch (event) { 1516 case NETDEV_DOWN: 1517 case NETDEV_UNREGISTER: 1518 nh_flags |= RTNH_F_DEAD; 1519 /* fall through */ 1520 case NETDEV_CHANGE: 1521 nh_flags |= RTNH_F_LINKDOWN; 1522 break; 1523 } 1524 if (event == NETDEV_UNREGISTER) 1525 RCU_INIT_POINTER(nh->nh_dev, NULL); 1526 1527 if (nh->nh_flags != nh_flags) 1528 WRITE_ONCE(nh->nh_flags, nh_flags); 1529 next: 1530 if (!(nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN))) 1531 alive++; 1532 if (!rtnl_dereference(nh->nh_dev)) 1533 deleted++; 1534 } endfor_nexthops(rt); 1535 1536 WRITE_ONCE(rt->rt_nhn_alive, alive); 1537 1538 /* if there are no more nexthops, delete the route */ 1539 if (event == NETDEV_UNREGISTER && deleted == rt->rt_nhn) 1540 mpls_route_update(net, index, NULL, NULL); 1541 } 1542 } 1543 1544 static void mpls_ifup(struct net_device *dev, unsigned int flags) 1545 { 1546 struct mpls_route __rcu **platform_label; 1547 struct net *net = dev_net(dev); 1548 unsigned index; 1549 u8 alive; 1550 1551 platform_label = rtnl_dereference(net->mpls.platform_label); 1552 for (index = 0; index < net->mpls.platform_labels; index++) { 1553 struct mpls_route *rt = rtnl_dereference(platform_label[index]); 1554 1555 if (!rt) 1556 continue; 1557 1558 alive = 0; 1559 change_nexthops(rt) { 1560 unsigned int nh_flags = nh->nh_flags; 1561 struct net_device *nh_dev = 1562 rtnl_dereference(nh->nh_dev); 1563 1564 if (!(nh_flags & flags)) { 1565 alive++; 1566 continue; 1567 } 1568 if (nh_dev != dev) 1569 continue; 1570 alive++; 1571 nh_flags &= ~flags; 1572 WRITE_ONCE(nh->nh_flags, nh_flags); 1573 } endfor_nexthops(rt); 1574 1575 WRITE_ONCE(rt->rt_nhn_alive, alive); 1576 } 1577 } 1578 1579 static int mpls_dev_notify(struct notifier_block *this, unsigned long event, 1580 void *ptr) 1581 { 1582 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1583 struct mpls_dev *mdev; 1584 unsigned int flags; 1585 1586 if (event == NETDEV_REGISTER) { 1587 mdev = mpls_add_dev(dev); 1588 if (IS_ERR(mdev)) 1589 return notifier_from_errno(PTR_ERR(mdev)); 1590 1591 return NOTIFY_OK; 1592 } 1593 1594 mdev = mpls_dev_get(dev); 1595 if (!mdev) 1596 return NOTIFY_OK; 1597 1598 switch (event) { 1599 case NETDEV_DOWN: 1600 mpls_ifdown(dev, event); 1601 break; 1602 case NETDEV_UP: 1603 flags = dev_get_flags(dev); 1604 if (flags & (IFF_RUNNING | IFF_LOWER_UP)) 1605 mpls_ifup(dev, RTNH_F_DEAD | RTNH_F_LINKDOWN); 1606 else 1607 mpls_ifup(dev, RTNH_F_DEAD); 1608 break; 1609 case NETDEV_CHANGE: 1610 flags = dev_get_flags(dev); 1611 if (flags & (IFF_RUNNING | IFF_LOWER_UP)) 1612 mpls_ifup(dev, RTNH_F_DEAD | RTNH_F_LINKDOWN); 1613 else 1614 mpls_ifdown(dev, event); 1615 break; 1616 case NETDEV_UNREGISTER: 1617 mpls_ifdown(dev, event); 1618 mdev = mpls_dev_get(dev); 1619 if (mdev) { 1620 mpls_dev_sysctl_unregister(dev, mdev); 1621 RCU_INIT_POINTER(dev->mpls_ptr, NULL); 1622 call_rcu(&mdev->rcu, mpls_dev_destroy_rcu); 1623 } 1624 break; 1625 case NETDEV_CHANGENAME: 1626 mdev = mpls_dev_get(dev); 1627 if (mdev) { 1628 int err; 1629 1630 mpls_dev_sysctl_unregister(dev, mdev); 1631 err = mpls_dev_sysctl_register(dev, mdev); 1632 if (err) 1633 return notifier_from_errno(err); 1634 } 1635 break; 1636 } 1637 return NOTIFY_OK; 1638 } 1639 1640 static struct notifier_block mpls_dev_notifier = { 1641 .notifier_call = mpls_dev_notify, 1642 }; 1643 1644 static int nla_put_via(struct sk_buff *skb, 1645 u8 table, const void *addr, int alen) 1646 { 1647 static const int table_to_family[NEIGH_NR_TABLES + 1] = { 1648 AF_INET, AF_INET6, AF_DECnet, AF_PACKET, 1649 }; 1650 struct nlattr *nla; 1651 struct rtvia *via; 1652 int family = AF_UNSPEC; 1653 1654 nla = nla_reserve(skb, RTA_VIA, alen + 2); 1655 if (!nla) 1656 return -EMSGSIZE; 1657 1658 if (table <= NEIGH_NR_TABLES) 1659 family = table_to_family[table]; 1660 1661 via = nla_data(nla); 1662 via->rtvia_family = family; 1663 memcpy(via->rtvia_addr, addr, alen); 1664 return 0; 1665 } 1666 1667 int nla_put_labels(struct sk_buff *skb, int attrtype, 1668 u8 labels, const u32 label[]) 1669 { 1670 struct nlattr *nla; 1671 struct mpls_shim_hdr *nla_label; 1672 bool bos; 1673 int i; 1674 nla = nla_reserve(skb, attrtype, labels*4); 1675 if (!nla) 1676 return -EMSGSIZE; 1677 1678 nla_label = nla_data(nla); 1679 bos = true; 1680 for (i = labels - 1; i >= 0; i--) { 1681 nla_label[i] = mpls_entry_encode(label[i], 0, 0, bos); 1682 bos = false; 1683 } 1684 1685 return 0; 1686 } 1687 EXPORT_SYMBOL_GPL(nla_put_labels); 1688 1689 int nla_get_labels(const struct nlattr *nla, u8 max_labels, u8 *labels, 1690 u32 label[], struct netlink_ext_ack *extack) 1691 { 1692 unsigned len = nla_len(nla); 1693 struct mpls_shim_hdr *nla_label; 1694 u8 nla_labels; 1695 bool bos; 1696 int i; 1697 1698 /* len needs to be an even multiple of 4 (the label size). Number 1699 * of labels is a u8 so check for overflow. 1700 */ 1701 if (len & 3 || len / 4 > 255) { 1702 NL_SET_ERR_MSG_ATTR(extack, nla, 1703 "Invalid length for labels attribute"); 1704 return -EINVAL; 1705 } 1706 1707 /* Limit the number of new labels allowed */ 1708 nla_labels = len/4; 1709 if (nla_labels > max_labels) { 1710 NL_SET_ERR_MSG(extack, "Too many labels"); 1711 return -EINVAL; 1712 } 1713 1714 /* when label == NULL, caller wants number of labels */ 1715 if (!label) 1716 goto out; 1717 1718 nla_label = nla_data(nla); 1719 bos = true; 1720 for (i = nla_labels - 1; i >= 0; i--, bos = false) { 1721 struct mpls_entry_decoded dec; 1722 dec = mpls_entry_decode(nla_label + i); 1723 1724 /* Ensure the bottom of stack flag is properly set 1725 * and ttl and tc are both clear. 1726 */ 1727 if (dec.ttl) { 1728 NL_SET_ERR_MSG_ATTR(extack, nla, 1729 "TTL in label must be 0"); 1730 return -EINVAL; 1731 } 1732 1733 if (dec.tc) { 1734 NL_SET_ERR_MSG_ATTR(extack, nla, 1735 "Traffic class in label must be 0"); 1736 return -EINVAL; 1737 } 1738 1739 if (dec.bos != bos) { 1740 NL_SET_BAD_ATTR(extack, nla); 1741 if (bos) { 1742 NL_SET_ERR_MSG(extack, 1743 "BOS bit must be set in first label"); 1744 } else { 1745 NL_SET_ERR_MSG(extack, 1746 "BOS bit can only be set in first label"); 1747 } 1748 return -EINVAL; 1749 } 1750 1751 switch (dec.label) { 1752 case MPLS_LABEL_IMPLNULL: 1753 /* RFC3032: This is a label that an LSR may 1754 * assign and distribute, but which never 1755 * actually appears in the encapsulation. 1756 */ 1757 NL_SET_ERR_MSG_ATTR(extack, nla, 1758 "Implicit NULL Label (3) can not be used in encapsulation"); 1759 return -EINVAL; 1760 } 1761 1762 label[i] = dec.label; 1763 } 1764 out: 1765 *labels = nla_labels; 1766 return 0; 1767 } 1768 EXPORT_SYMBOL_GPL(nla_get_labels); 1769 1770 static int rtm_to_route_config(struct sk_buff *skb, 1771 struct nlmsghdr *nlh, 1772 struct mpls_route_config *cfg, 1773 struct netlink_ext_ack *extack) 1774 { 1775 struct rtmsg *rtm; 1776 struct nlattr *tb[RTA_MAX+1]; 1777 int index; 1778 int err; 1779 1780 err = nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX, 1781 rtm_mpls_policy, extack); 1782 if (err < 0) 1783 goto errout; 1784 1785 err = -EINVAL; 1786 rtm = nlmsg_data(nlh); 1787 1788 if (rtm->rtm_family != AF_MPLS) { 1789 NL_SET_ERR_MSG(extack, "Invalid address family in rtmsg"); 1790 goto errout; 1791 } 1792 if (rtm->rtm_dst_len != 20) { 1793 NL_SET_ERR_MSG(extack, "rtm_dst_len must be 20 for MPLS"); 1794 goto errout; 1795 } 1796 if (rtm->rtm_src_len != 0) { 1797 NL_SET_ERR_MSG(extack, "rtm_src_len must be 0 for MPLS"); 1798 goto errout; 1799 } 1800 if (rtm->rtm_tos != 0) { 1801 NL_SET_ERR_MSG(extack, "rtm_tos must be 0 for MPLS"); 1802 goto errout; 1803 } 1804 if (rtm->rtm_table != RT_TABLE_MAIN) { 1805 NL_SET_ERR_MSG(extack, 1806 "MPLS only supports the main route table"); 1807 goto errout; 1808 } 1809 /* Any value is acceptable for rtm_protocol */ 1810 1811 /* As mpls uses destination specific addresses 1812 * (or source specific address in the case of multicast) 1813 * all addresses have universal scope. 1814 */ 1815 if (rtm->rtm_scope != RT_SCOPE_UNIVERSE) { 1816 NL_SET_ERR_MSG(extack, 1817 "Invalid route scope - MPLS only supports UNIVERSE"); 1818 goto errout; 1819 } 1820 if (rtm->rtm_type != RTN_UNICAST) { 1821 NL_SET_ERR_MSG(extack, 1822 "Invalid route type - MPLS only supports UNICAST"); 1823 goto errout; 1824 } 1825 if (rtm->rtm_flags != 0) { 1826 NL_SET_ERR_MSG(extack, "rtm_flags must be 0 for MPLS"); 1827 goto errout; 1828 } 1829 1830 cfg->rc_label = LABEL_NOT_SPECIFIED; 1831 cfg->rc_protocol = rtm->rtm_protocol; 1832 cfg->rc_via_table = MPLS_NEIGH_TABLE_UNSPEC; 1833 cfg->rc_ttl_propagate = MPLS_TTL_PROP_DEFAULT; 1834 cfg->rc_nlflags = nlh->nlmsg_flags; 1835 cfg->rc_nlinfo.portid = NETLINK_CB(skb).portid; 1836 cfg->rc_nlinfo.nlh = nlh; 1837 cfg->rc_nlinfo.nl_net = sock_net(skb->sk); 1838 1839 for (index = 0; index <= RTA_MAX; index++) { 1840 struct nlattr *nla = tb[index]; 1841 if (!nla) 1842 continue; 1843 1844 switch (index) { 1845 case RTA_OIF: 1846 cfg->rc_ifindex = nla_get_u32(nla); 1847 break; 1848 case RTA_NEWDST: 1849 if (nla_get_labels(nla, MAX_NEW_LABELS, 1850 &cfg->rc_output_labels, 1851 cfg->rc_output_label, extack)) 1852 goto errout; 1853 break; 1854 case RTA_DST: 1855 { 1856 u8 label_count; 1857 if (nla_get_labels(nla, 1, &label_count, 1858 &cfg->rc_label, extack)) 1859 goto errout; 1860 1861 if (!mpls_label_ok(cfg->rc_nlinfo.nl_net, 1862 &cfg->rc_label, extack)) 1863 goto errout; 1864 break; 1865 } 1866 case RTA_GATEWAY: 1867 NL_SET_ERR_MSG(extack, "MPLS does not support RTA_GATEWAY attribute"); 1868 goto errout; 1869 case RTA_VIA: 1870 { 1871 if (nla_get_via(nla, &cfg->rc_via_alen, 1872 &cfg->rc_via_table, cfg->rc_via, 1873 extack)) 1874 goto errout; 1875 break; 1876 } 1877 case RTA_MULTIPATH: 1878 { 1879 cfg->rc_mp = nla_data(nla); 1880 cfg->rc_mp_len = nla_len(nla); 1881 break; 1882 } 1883 case RTA_TTL_PROPAGATE: 1884 { 1885 u8 ttl_propagate = nla_get_u8(nla); 1886 1887 if (ttl_propagate > 1) { 1888 NL_SET_ERR_MSG_ATTR(extack, nla, 1889 "RTA_TTL_PROPAGATE can only be 0 or 1"); 1890 goto errout; 1891 } 1892 cfg->rc_ttl_propagate = ttl_propagate ? 1893 MPLS_TTL_PROP_ENABLED : 1894 MPLS_TTL_PROP_DISABLED; 1895 break; 1896 } 1897 default: 1898 NL_SET_ERR_MSG_ATTR(extack, nla, "Unknown attribute"); 1899 /* Unsupported attribute */ 1900 goto errout; 1901 } 1902 } 1903 1904 err = 0; 1905 errout: 1906 return err; 1907 } 1908 1909 static int mpls_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, 1910 struct netlink_ext_ack *extack) 1911 { 1912 struct mpls_route_config *cfg; 1913 int err; 1914 1915 cfg = kzalloc(sizeof(*cfg), GFP_KERNEL); 1916 if (!cfg) 1917 return -ENOMEM; 1918 1919 err = rtm_to_route_config(skb, nlh, cfg, extack); 1920 if (err < 0) 1921 goto out; 1922 1923 err = mpls_route_del(cfg, extack); 1924 out: 1925 kfree(cfg); 1926 1927 return err; 1928 } 1929 1930 1931 static int mpls_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, 1932 struct netlink_ext_ack *extack) 1933 { 1934 struct mpls_route_config *cfg; 1935 int err; 1936 1937 cfg = kzalloc(sizeof(*cfg), GFP_KERNEL); 1938 if (!cfg) 1939 return -ENOMEM; 1940 1941 err = rtm_to_route_config(skb, nlh, cfg, extack); 1942 if (err < 0) 1943 goto out; 1944 1945 err = mpls_route_add(cfg, extack); 1946 out: 1947 kfree(cfg); 1948 1949 return err; 1950 } 1951 1952 static int mpls_dump_route(struct sk_buff *skb, u32 portid, u32 seq, int event, 1953 u32 label, struct mpls_route *rt, int flags) 1954 { 1955 struct net_device *dev; 1956 struct nlmsghdr *nlh; 1957 struct rtmsg *rtm; 1958 1959 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*rtm), flags); 1960 if (nlh == NULL) 1961 return -EMSGSIZE; 1962 1963 rtm = nlmsg_data(nlh); 1964 rtm->rtm_family = AF_MPLS; 1965 rtm->rtm_dst_len = 20; 1966 rtm->rtm_src_len = 0; 1967 rtm->rtm_tos = 0; 1968 rtm->rtm_table = RT_TABLE_MAIN; 1969 rtm->rtm_protocol = rt->rt_protocol; 1970 rtm->rtm_scope = RT_SCOPE_UNIVERSE; 1971 rtm->rtm_type = RTN_UNICAST; 1972 rtm->rtm_flags = 0; 1973 1974 if (nla_put_labels(skb, RTA_DST, 1, &label)) 1975 goto nla_put_failure; 1976 1977 if (rt->rt_ttl_propagate != MPLS_TTL_PROP_DEFAULT) { 1978 bool ttl_propagate = 1979 rt->rt_ttl_propagate == MPLS_TTL_PROP_ENABLED; 1980 1981 if (nla_put_u8(skb, RTA_TTL_PROPAGATE, 1982 ttl_propagate)) 1983 goto nla_put_failure; 1984 } 1985 if (rt->rt_nhn == 1) { 1986 const struct mpls_nh *nh = rt->rt_nh; 1987 1988 if (nh->nh_labels && 1989 nla_put_labels(skb, RTA_NEWDST, nh->nh_labels, 1990 nh->nh_label)) 1991 goto nla_put_failure; 1992 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC && 1993 nla_put_via(skb, nh->nh_via_table, mpls_nh_via(rt, nh), 1994 nh->nh_via_alen)) 1995 goto nla_put_failure; 1996 dev = rtnl_dereference(nh->nh_dev); 1997 if (dev && nla_put_u32(skb, RTA_OIF, dev->ifindex)) 1998 goto nla_put_failure; 1999 if (nh->nh_flags & RTNH_F_LINKDOWN) 2000 rtm->rtm_flags |= RTNH_F_LINKDOWN; 2001 if (nh->nh_flags & RTNH_F_DEAD) 2002 rtm->rtm_flags |= RTNH_F_DEAD; 2003 } else { 2004 struct rtnexthop *rtnh; 2005 struct nlattr *mp; 2006 u8 linkdown = 0; 2007 u8 dead = 0; 2008 2009 mp = nla_nest_start_noflag(skb, RTA_MULTIPATH); 2010 if (!mp) 2011 goto nla_put_failure; 2012 2013 for_nexthops(rt) { 2014 dev = rtnl_dereference(nh->nh_dev); 2015 if (!dev) 2016 continue; 2017 2018 rtnh = nla_reserve_nohdr(skb, sizeof(*rtnh)); 2019 if (!rtnh) 2020 goto nla_put_failure; 2021 2022 rtnh->rtnh_ifindex = dev->ifindex; 2023 if (nh->nh_flags & RTNH_F_LINKDOWN) { 2024 rtnh->rtnh_flags |= RTNH_F_LINKDOWN; 2025 linkdown++; 2026 } 2027 if (nh->nh_flags & RTNH_F_DEAD) { 2028 rtnh->rtnh_flags |= RTNH_F_DEAD; 2029 dead++; 2030 } 2031 2032 if (nh->nh_labels && nla_put_labels(skb, RTA_NEWDST, 2033 nh->nh_labels, 2034 nh->nh_label)) 2035 goto nla_put_failure; 2036 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC && 2037 nla_put_via(skb, nh->nh_via_table, 2038 mpls_nh_via(rt, nh), 2039 nh->nh_via_alen)) 2040 goto nla_put_failure; 2041 2042 /* length of rtnetlink header + attributes */ 2043 rtnh->rtnh_len = nlmsg_get_pos(skb) - (void *)rtnh; 2044 } endfor_nexthops(rt); 2045 2046 if (linkdown == rt->rt_nhn) 2047 rtm->rtm_flags |= RTNH_F_LINKDOWN; 2048 if (dead == rt->rt_nhn) 2049 rtm->rtm_flags |= RTNH_F_DEAD; 2050 2051 nla_nest_end(skb, mp); 2052 } 2053 2054 nlmsg_end(skb, nlh); 2055 return 0; 2056 2057 nla_put_failure: 2058 nlmsg_cancel(skb, nlh); 2059 return -EMSGSIZE; 2060 } 2061 2062 #if IS_ENABLED(CONFIG_INET) 2063 static int mpls_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh, 2064 struct fib_dump_filter *filter, 2065 struct netlink_callback *cb) 2066 { 2067 return ip_valid_fib_dump_req(net, nlh, filter, cb); 2068 } 2069 #else 2070 static int mpls_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh, 2071 struct fib_dump_filter *filter, 2072 struct netlink_callback *cb) 2073 { 2074 struct netlink_ext_ack *extack = cb->extack; 2075 struct nlattr *tb[RTA_MAX + 1]; 2076 struct rtmsg *rtm; 2077 int err, i; 2078 2079 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) { 2080 NL_SET_ERR_MSG_MOD(extack, "Invalid header for FIB dump request"); 2081 return -EINVAL; 2082 } 2083 2084 rtm = nlmsg_data(nlh); 2085 if (rtm->rtm_dst_len || rtm->rtm_src_len || rtm->rtm_tos || 2086 rtm->rtm_table || rtm->rtm_scope || rtm->rtm_type || 2087 rtm->rtm_flags) { 2088 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for FIB dump request"); 2089 return -EINVAL; 2090 } 2091 2092 if (rtm->rtm_protocol) { 2093 filter->protocol = rtm->rtm_protocol; 2094 filter->filter_set = 1; 2095 cb->answer_flags = NLM_F_DUMP_FILTERED; 2096 } 2097 2098 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX, 2099 rtm_mpls_policy, extack); 2100 if (err < 0) 2101 return err; 2102 2103 for (i = 0; i <= RTA_MAX; ++i) { 2104 int ifindex; 2105 2106 if (i == RTA_OIF) { 2107 ifindex = nla_get_u32(tb[i]); 2108 filter->dev = __dev_get_by_index(net, ifindex); 2109 if (!filter->dev) 2110 return -ENODEV; 2111 filter->filter_set = 1; 2112 } else if (tb[i]) { 2113 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request"); 2114 return -EINVAL; 2115 } 2116 } 2117 2118 return 0; 2119 } 2120 #endif 2121 2122 static bool mpls_rt_uses_dev(struct mpls_route *rt, 2123 const struct net_device *dev) 2124 { 2125 struct net_device *nh_dev; 2126 2127 if (rt->rt_nhn == 1) { 2128 struct mpls_nh *nh = rt->rt_nh; 2129 2130 nh_dev = rtnl_dereference(nh->nh_dev); 2131 if (dev == nh_dev) 2132 return true; 2133 } else { 2134 for_nexthops(rt) { 2135 nh_dev = rtnl_dereference(nh->nh_dev); 2136 if (nh_dev == dev) 2137 return true; 2138 } endfor_nexthops(rt); 2139 } 2140 2141 return false; 2142 } 2143 2144 static int mpls_dump_routes(struct sk_buff *skb, struct netlink_callback *cb) 2145 { 2146 const struct nlmsghdr *nlh = cb->nlh; 2147 struct net *net = sock_net(skb->sk); 2148 struct mpls_route __rcu **platform_label; 2149 struct fib_dump_filter filter = {}; 2150 unsigned int flags = NLM_F_MULTI; 2151 size_t platform_labels; 2152 unsigned int index; 2153 2154 ASSERT_RTNL(); 2155 2156 if (cb->strict_check) { 2157 int err; 2158 2159 err = mpls_valid_fib_dump_req(net, nlh, &filter, cb); 2160 if (err < 0) 2161 return err; 2162 2163 /* for MPLS, there is only 1 table with fixed type and flags. 2164 * If either are set in the filter then return nothing. 2165 */ 2166 if ((filter.table_id && filter.table_id != RT_TABLE_MAIN) || 2167 (filter.rt_type && filter.rt_type != RTN_UNICAST) || 2168 filter.flags) 2169 return skb->len; 2170 } 2171 2172 index = cb->args[0]; 2173 if (index < MPLS_LABEL_FIRST_UNRESERVED) 2174 index = MPLS_LABEL_FIRST_UNRESERVED; 2175 2176 platform_label = rtnl_dereference(net->mpls.platform_label); 2177 platform_labels = net->mpls.platform_labels; 2178 2179 if (filter.filter_set) 2180 flags |= NLM_F_DUMP_FILTERED; 2181 2182 for (; index < platform_labels; index++) { 2183 struct mpls_route *rt; 2184 2185 rt = rtnl_dereference(platform_label[index]); 2186 if (!rt) 2187 continue; 2188 2189 if ((filter.dev && !mpls_rt_uses_dev(rt, filter.dev)) || 2190 (filter.protocol && rt->rt_protocol != filter.protocol)) 2191 continue; 2192 2193 if (mpls_dump_route(skb, NETLINK_CB(cb->skb).portid, 2194 cb->nlh->nlmsg_seq, RTM_NEWROUTE, 2195 index, rt, flags) < 0) 2196 break; 2197 } 2198 cb->args[0] = index; 2199 2200 return skb->len; 2201 } 2202 2203 static inline size_t lfib_nlmsg_size(struct mpls_route *rt) 2204 { 2205 size_t payload = 2206 NLMSG_ALIGN(sizeof(struct rtmsg)) 2207 + nla_total_size(4) /* RTA_DST */ 2208 + nla_total_size(1); /* RTA_TTL_PROPAGATE */ 2209 2210 if (rt->rt_nhn == 1) { 2211 struct mpls_nh *nh = rt->rt_nh; 2212 2213 if (nh->nh_dev) 2214 payload += nla_total_size(4); /* RTA_OIF */ 2215 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC) /* RTA_VIA */ 2216 payload += nla_total_size(2 + nh->nh_via_alen); 2217 if (nh->nh_labels) /* RTA_NEWDST */ 2218 payload += nla_total_size(nh->nh_labels * 4); 2219 } else { 2220 /* each nexthop is packed in an attribute */ 2221 size_t nhsize = 0; 2222 2223 for_nexthops(rt) { 2224 if (!rtnl_dereference(nh->nh_dev)) 2225 continue; 2226 nhsize += nla_total_size(sizeof(struct rtnexthop)); 2227 /* RTA_VIA */ 2228 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC) 2229 nhsize += nla_total_size(2 + nh->nh_via_alen); 2230 if (nh->nh_labels) 2231 nhsize += nla_total_size(nh->nh_labels * 4); 2232 } endfor_nexthops(rt); 2233 /* nested attribute */ 2234 payload += nla_total_size(nhsize); 2235 } 2236 2237 return payload; 2238 } 2239 2240 static void rtmsg_lfib(int event, u32 label, struct mpls_route *rt, 2241 struct nlmsghdr *nlh, struct net *net, u32 portid, 2242 unsigned int nlm_flags) 2243 { 2244 struct sk_buff *skb; 2245 u32 seq = nlh ? nlh->nlmsg_seq : 0; 2246 int err = -ENOBUFS; 2247 2248 skb = nlmsg_new(lfib_nlmsg_size(rt), GFP_KERNEL); 2249 if (skb == NULL) 2250 goto errout; 2251 2252 err = mpls_dump_route(skb, portid, seq, event, label, rt, nlm_flags); 2253 if (err < 0) { 2254 /* -EMSGSIZE implies BUG in lfib_nlmsg_size */ 2255 WARN_ON(err == -EMSGSIZE); 2256 kfree_skb(skb); 2257 goto errout; 2258 } 2259 rtnl_notify(skb, net, portid, RTNLGRP_MPLS_ROUTE, nlh, GFP_KERNEL); 2260 2261 return; 2262 errout: 2263 if (err < 0) 2264 rtnl_set_sk_err(net, RTNLGRP_MPLS_ROUTE, err); 2265 } 2266 2267 static int mpls_valid_getroute_req(struct sk_buff *skb, 2268 const struct nlmsghdr *nlh, 2269 struct nlattr **tb, 2270 struct netlink_ext_ack *extack) 2271 { 2272 struct rtmsg *rtm; 2273 int i, err; 2274 2275 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) { 2276 NL_SET_ERR_MSG_MOD(extack, 2277 "Invalid header for get route request"); 2278 return -EINVAL; 2279 } 2280 2281 if (!netlink_strict_get_check(skb)) 2282 return nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX, 2283 rtm_mpls_policy, extack); 2284 2285 rtm = nlmsg_data(nlh); 2286 if ((rtm->rtm_dst_len && rtm->rtm_dst_len != 20) || 2287 rtm->rtm_src_len || rtm->rtm_tos || rtm->rtm_table || 2288 rtm->rtm_protocol || rtm->rtm_scope || rtm->rtm_type) { 2289 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get route request"); 2290 return -EINVAL; 2291 } 2292 if (rtm->rtm_flags & ~RTM_F_FIB_MATCH) { 2293 NL_SET_ERR_MSG_MOD(extack, 2294 "Invalid flags for get route request"); 2295 return -EINVAL; 2296 } 2297 2298 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX, 2299 rtm_mpls_policy, extack); 2300 if (err) 2301 return err; 2302 2303 if ((tb[RTA_DST] || tb[RTA_NEWDST]) && !rtm->rtm_dst_len) { 2304 NL_SET_ERR_MSG_MOD(extack, "rtm_dst_len must be 20 for MPLS"); 2305 return -EINVAL; 2306 } 2307 2308 for (i = 0; i <= RTA_MAX; i++) { 2309 if (!tb[i]) 2310 continue; 2311 2312 switch (i) { 2313 case RTA_DST: 2314 case RTA_NEWDST: 2315 break; 2316 default: 2317 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get route request"); 2318 return -EINVAL; 2319 } 2320 } 2321 2322 return 0; 2323 } 2324 2325 static int mpls_getroute(struct sk_buff *in_skb, struct nlmsghdr *in_nlh, 2326 struct netlink_ext_ack *extack) 2327 { 2328 struct net *net = sock_net(in_skb->sk); 2329 u32 portid = NETLINK_CB(in_skb).portid; 2330 u32 in_label = LABEL_NOT_SPECIFIED; 2331 struct nlattr *tb[RTA_MAX + 1]; 2332 u32 labels[MAX_NEW_LABELS]; 2333 struct mpls_shim_hdr *hdr; 2334 unsigned int hdr_size = 0; 2335 struct net_device *dev; 2336 struct mpls_route *rt; 2337 struct rtmsg *rtm, *r; 2338 struct nlmsghdr *nlh; 2339 struct sk_buff *skb; 2340 struct mpls_nh *nh; 2341 u8 n_labels; 2342 int err; 2343 2344 err = mpls_valid_getroute_req(in_skb, in_nlh, tb, extack); 2345 if (err < 0) 2346 goto errout; 2347 2348 rtm = nlmsg_data(in_nlh); 2349 2350 if (tb[RTA_DST]) { 2351 u8 label_count; 2352 2353 if (nla_get_labels(tb[RTA_DST], 1, &label_count, 2354 &in_label, extack)) { 2355 err = -EINVAL; 2356 goto errout; 2357 } 2358 2359 if (!mpls_label_ok(net, &in_label, extack)) { 2360 err = -EINVAL; 2361 goto errout; 2362 } 2363 } 2364 2365 rt = mpls_route_input_rcu(net, in_label); 2366 if (!rt) { 2367 err = -ENETUNREACH; 2368 goto errout; 2369 } 2370 2371 if (rtm->rtm_flags & RTM_F_FIB_MATCH) { 2372 skb = nlmsg_new(lfib_nlmsg_size(rt), GFP_KERNEL); 2373 if (!skb) { 2374 err = -ENOBUFS; 2375 goto errout; 2376 } 2377 2378 err = mpls_dump_route(skb, portid, in_nlh->nlmsg_seq, 2379 RTM_NEWROUTE, in_label, rt, 0); 2380 if (err < 0) { 2381 /* -EMSGSIZE implies BUG in lfib_nlmsg_size */ 2382 WARN_ON(err == -EMSGSIZE); 2383 goto errout_free; 2384 } 2385 2386 return rtnl_unicast(skb, net, portid); 2387 } 2388 2389 if (tb[RTA_NEWDST]) { 2390 if (nla_get_labels(tb[RTA_NEWDST], MAX_NEW_LABELS, &n_labels, 2391 labels, extack) != 0) { 2392 err = -EINVAL; 2393 goto errout; 2394 } 2395 2396 hdr_size = n_labels * sizeof(struct mpls_shim_hdr); 2397 } 2398 2399 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); 2400 if (!skb) { 2401 err = -ENOBUFS; 2402 goto errout; 2403 } 2404 2405 skb->protocol = htons(ETH_P_MPLS_UC); 2406 2407 if (hdr_size) { 2408 bool bos; 2409 int i; 2410 2411 if (skb_cow(skb, hdr_size)) { 2412 err = -ENOBUFS; 2413 goto errout_free; 2414 } 2415 2416 skb_reserve(skb, hdr_size); 2417 skb_push(skb, hdr_size); 2418 skb_reset_network_header(skb); 2419 2420 /* Push new labels */ 2421 hdr = mpls_hdr(skb); 2422 bos = true; 2423 for (i = n_labels - 1; i >= 0; i--) { 2424 hdr[i] = mpls_entry_encode(labels[i], 2425 1, 0, bos); 2426 bos = false; 2427 } 2428 } 2429 2430 nh = mpls_select_multipath(rt, skb); 2431 if (!nh) { 2432 err = -ENETUNREACH; 2433 goto errout_free; 2434 } 2435 2436 if (hdr_size) { 2437 skb_pull(skb, hdr_size); 2438 skb_reset_network_header(skb); 2439 } 2440 2441 nlh = nlmsg_put(skb, portid, in_nlh->nlmsg_seq, 2442 RTM_NEWROUTE, sizeof(*r), 0); 2443 if (!nlh) { 2444 err = -EMSGSIZE; 2445 goto errout_free; 2446 } 2447 2448 r = nlmsg_data(nlh); 2449 r->rtm_family = AF_MPLS; 2450 r->rtm_dst_len = 20; 2451 r->rtm_src_len = 0; 2452 r->rtm_table = RT_TABLE_MAIN; 2453 r->rtm_type = RTN_UNICAST; 2454 r->rtm_scope = RT_SCOPE_UNIVERSE; 2455 r->rtm_protocol = rt->rt_protocol; 2456 r->rtm_flags = 0; 2457 2458 if (nla_put_labels(skb, RTA_DST, 1, &in_label)) 2459 goto nla_put_failure; 2460 2461 if (nh->nh_labels && 2462 nla_put_labels(skb, RTA_NEWDST, nh->nh_labels, 2463 nh->nh_label)) 2464 goto nla_put_failure; 2465 2466 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC && 2467 nla_put_via(skb, nh->nh_via_table, mpls_nh_via(rt, nh), 2468 nh->nh_via_alen)) 2469 goto nla_put_failure; 2470 dev = rtnl_dereference(nh->nh_dev); 2471 if (dev && nla_put_u32(skb, RTA_OIF, dev->ifindex)) 2472 goto nla_put_failure; 2473 2474 nlmsg_end(skb, nlh); 2475 2476 err = rtnl_unicast(skb, net, portid); 2477 errout: 2478 return err; 2479 2480 nla_put_failure: 2481 nlmsg_cancel(skb, nlh); 2482 err = -EMSGSIZE; 2483 errout_free: 2484 kfree_skb(skb); 2485 return err; 2486 } 2487 2488 static int resize_platform_label_table(struct net *net, size_t limit) 2489 { 2490 size_t size = sizeof(struct mpls_route *) * limit; 2491 size_t old_limit; 2492 size_t cp_size; 2493 struct mpls_route __rcu **labels = NULL, **old; 2494 struct mpls_route *rt0 = NULL, *rt2 = NULL; 2495 unsigned index; 2496 2497 if (size) { 2498 labels = kvzalloc(size, GFP_KERNEL); 2499 if (!labels) 2500 goto nolabels; 2501 } 2502 2503 /* In case the predefined labels need to be populated */ 2504 if (limit > MPLS_LABEL_IPV4NULL) { 2505 struct net_device *lo = net->loopback_dev; 2506 rt0 = mpls_rt_alloc(1, lo->addr_len, 0); 2507 if (IS_ERR(rt0)) 2508 goto nort0; 2509 RCU_INIT_POINTER(rt0->rt_nh->nh_dev, lo); 2510 rt0->rt_protocol = RTPROT_KERNEL; 2511 rt0->rt_payload_type = MPT_IPV4; 2512 rt0->rt_ttl_propagate = MPLS_TTL_PROP_DEFAULT; 2513 rt0->rt_nh->nh_via_table = NEIGH_LINK_TABLE; 2514 rt0->rt_nh->nh_via_alen = lo->addr_len; 2515 memcpy(__mpls_nh_via(rt0, rt0->rt_nh), lo->dev_addr, 2516 lo->addr_len); 2517 } 2518 if (limit > MPLS_LABEL_IPV6NULL) { 2519 struct net_device *lo = net->loopback_dev; 2520 rt2 = mpls_rt_alloc(1, lo->addr_len, 0); 2521 if (IS_ERR(rt2)) 2522 goto nort2; 2523 RCU_INIT_POINTER(rt2->rt_nh->nh_dev, lo); 2524 rt2->rt_protocol = RTPROT_KERNEL; 2525 rt2->rt_payload_type = MPT_IPV6; 2526 rt2->rt_ttl_propagate = MPLS_TTL_PROP_DEFAULT; 2527 rt2->rt_nh->nh_via_table = NEIGH_LINK_TABLE; 2528 rt2->rt_nh->nh_via_alen = lo->addr_len; 2529 memcpy(__mpls_nh_via(rt2, rt2->rt_nh), lo->dev_addr, 2530 lo->addr_len); 2531 } 2532 2533 rtnl_lock(); 2534 /* Remember the original table */ 2535 old = rtnl_dereference(net->mpls.platform_label); 2536 old_limit = net->mpls.platform_labels; 2537 2538 /* Free any labels beyond the new table */ 2539 for (index = limit; index < old_limit; index++) 2540 mpls_route_update(net, index, NULL, NULL); 2541 2542 /* Copy over the old labels */ 2543 cp_size = size; 2544 if (old_limit < limit) 2545 cp_size = old_limit * sizeof(struct mpls_route *); 2546 2547 memcpy(labels, old, cp_size); 2548 2549 /* If needed set the predefined labels */ 2550 if ((old_limit <= MPLS_LABEL_IPV6NULL) && 2551 (limit > MPLS_LABEL_IPV6NULL)) { 2552 RCU_INIT_POINTER(labels[MPLS_LABEL_IPV6NULL], rt2); 2553 rt2 = NULL; 2554 } 2555 2556 if ((old_limit <= MPLS_LABEL_IPV4NULL) && 2557 (limit > MPLS_LABEL_IPV4NULL)) { 2558 RCU_INIT_POINTER(labels[MPLS_LABEL_IPV4NULL], rt0); 2559 rt0 = NULL; 2560 } 2561 2562 /* Update the global pointers */ 2563 net->mpls.platform_labels = limit; 2564 rcu_assign_pointer(net->mpls.platform_label, labels); 2565 2566 rtnl_unlock(); 2567 2568 mpls_rt_free(rt2); 2569 mpls_rt_free(rt0); 2570 2571 if (old) { 2572 synchronize_rcu(); 2573 kvfree(old); 2574 } 2575 return 0; 2576 2577 nort2: 2578 mpls_rt_free(rt0); 2579 nort0: 2580 kvfree(labels); 2581 nolabels: 2582 return -ENOMEM; 2583 } 2584 2585 static int mpls_platform_labels(struct ctl_table *table, int write, 2586 void *buffer, size_t *lenp, loff_t *ppos) 2587 { 2588 struct net *net = table->data; 2589 int platform_labels = net->mpls.platform_labels; 2590 int ret; 2591 struct ctl_table tmp = { 2592 .procname = table->procname, 2593 .data = &platform_labels, 2594 .maxlen = sizeof(int), 2595 .mode = table->mode, 2596 .extra1 = SYSCTL_ZERO, 2597 .extra2 = &label_limit, 2598 }; 2599 2600 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); 2601 2602 if (write && ret == 0) 2603 ret = resize_platform_label_table(net, platform_labels); 2604 2605 return ret; 2606 } 2607 2608 #define MPLS_NS_SYSCTL_OFFSET(field) \ 2609 (&((struct net *)0)->field) 2610 2611 static const struct ctl_table mpls_table[] = { 2612 { 2613 .procname = "platform_labels", 2614 .data = NULL, 2615 .maxlen = sizeof(int), 2616 .mode = 0644, 2617 .proc_handler = mpls_platform_labels, 2618 }, 2619 { 2620 .procname = "ip_ttl_propagate", 2621 .data = MPLS_NS_SYSCTL_OFFSET(mpls.ip_ttl_propagate), 2622 .maxlen = sizeof(int), 2623 .mode = 0644, 2624 .proc_handler = proc_dointvec_minmax, 2625 .extra1 = SYSCTL_ZERO, 2626 .extra2 = SYSCTL_ONE, 2627 }, 2628 { 2629 .procname = "default_ttl", 2630 .data = MPLS_NS_SYSCTL_OFFSET(mpls.default_ttl), 2631 .maxlen = sizeof(int), 2632 .mode = 0644, 2633 .proc_handler = proc_dointvec_minmax, 2634 .extra1 = SYSCTL_ONE, 2635 .extra2 = &ttl_max, 2636 }, 2637 { } 2638 }; 2639 2640 static int mpls_net_init(struct net *net) 2641 { 2642 struct ctl_table *table; 2643 int i; 2644 2645 net->mpls.platform_labels = 0; 2646 net->mpls.platform_label = NULL; 2647 net->mpls.ip_ttl_propagate = 1; 2648 net->mpls.default_ttl = 255; 2649 2650 table = kmemdup(mpls_table, sizeof(mpls_table), GFP_KERNEL); 2651 if (table == NULL) 2652 return -ENOMEM; 2653 2654 /* Table data contains only offsets relative to the base of 2655 * the mdev at this point, so make them absolute. 2656 */ 2657 for (i = 0; i < ARRAY_SIZE(mpls_table) - 1; i++) 2658 table[i].data = (char *)net + (uintptr_t)table[i].data; 2659 2660 net->mpls.ctl = register_net_sysctl(net, "net/mpls", table); 2661 if (net->mpls.ctl == NULL) { 2662 kfree(table); 2663 return -ENOMEM; 2664 } 2665 2666 return 0; 2667 } 2668 2669 static void mpls_net_exit(struct net *net) 2670 { 2671 struct mpls_route __rcu **platform_label; 2672 size_t platform_labels; 2673 struct ctl_table *table; 2674 unsigned int index; 2675 2676 table = net->mpls.ctl->ctl_table_arg; 2677 unregister_net_sysctl_table(net->mpls.ctl); 2678 kfree(table); 2679 2680 /* An rcu grace period has passed since there was a device in 2681 * the network namespace (and thus the last in flight packet) 2682 * left this network namespace. This is because 2683 * unregister_netdevice_many and netdev_run_todo has completed 2684 * for each network device that was in this network namespace. 2685 * 2686 * As such no additional rcu synchronization is necessary when 2687 * freeing the platform_label table. 2688 */ 2689 rtnl_lock(); 2690 platform_label = rtnl_dereference(net->mpls.platform_label); 2691 platform_labels = net->mpls.platform_labels; 2692 for (index = 0; index < platform_labels; index++) { 2693 struct mpls_route *rt = rtnl_dereference(platform_label[index]); 2694 RCU_INIT_POINTER(platform_label[index], NULL); 2695 mpls_notify_route(net, index, rt, NULL, NULL); 2696 mpls_rt_free(rt); 2697 } 2698 rtnl_unlock(); 2699 2700 kvfree(platform_label); 2701 } 2702 2703 static struct pernet_operations mpls_net_ops = { 2704 .init = mpls_net_init, 2705 .exit = mpls_net_exit, 2706 }; 2707 2708 static struct rtnl_af_ops mpls_af_ops __read_mostly = { 2709 .family = AF_MPLS, 2710 .fill_stats_af = mpls_fill_stats_af, 2711 .get_stats_af_size = mpls_get_stats_af_size, 2712 }; 2713 2714 static int __init mpls_init(void) 2715 { 2716 int err; 2717 2718 BUILD_BUG_ON(sizeof(struct mpls_shim_hdr) != 4); 2719 2720 err = register_pernet_subsys(&mpls_net_ops); 2721 if (err) 2722 goto out; 2723 2724 err = register_netdevice_notifier(&mpls_dev_notifier); 2725 if (err) 2726 goto out_unregister_pernet; 2727 2728 dev_add_pack(&mpls_packet_type); 2729 2730 rtnl_af_register(&mpls_af_ops); 2731 2732 rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_NEWROUTE, 2733 mpls_rtm_newroute, NULL, 0); 2734 rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_DELROUTE, 2735 mpls_rtm_delroute, NULL, 0); 2736 rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_GETROUTE, 2737 mpls_getroute, mpls_dump_routes, 0); 2738 rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_GETNETCONF, 2739 mpls_netconf_get_devconf, 2740 mpls_netconf_dump_devconf, 0); 2741 err = ipgre_tunnel_encap_add_mpls_ops(); 2742 if (err) 2743 pr_err("Can't add mpls over gre tunnel ops\n"); 2744 2745 err = 0; 2746 out: 2747 return err; 2748 2749 out_unregister_pernet: 2750 unregister_pernet_subsys(&mpls_net_ops); 2751 goto out; 2752 } 2753 module_init(mpls_init); 2754 2755 static void __exit mpls_exit(void) 2756 { 2757 rtnl_unregister_all(PF_MPLS); 2758 rtnl_af_unregister(&mpls_af_ops); 2759 dev_remove_pack(&mpls_packet_type); 2760 unregister_netdevice_notifier(&mpls_dev_notifier); 2761 unregister_pernet_subsys(&mpls_net_ops); 2762 ipgre_tunnel_encap_del_mpls_ops(); 2763 } 2764 module_exit(mpls_exit); 2765 2766 MODULE_DESCRIPTION("MultiProtocol Label Switching"); 2767 MODULE_LICENSE("GPL v2"); 2768 MODULE_ALIAS_NETPROTO(PF_MPLS); 2769