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 skb_dst_drop(skb); 381 382 /* Read and decode the label */ 383 hdr = mpls_hdr(skb); 384 dec = mpls_entry_decode(hdr); 385 386 rt = mpls_route_input_rcu(net, dec.label); 387 if (!rt) { 388 MPLS_INC_STATS(mdev, rx_noroute); 389 goto drop; 390 } 391 392 nh = mpls_select_multipath(rt, skb); 393 if (!nh) 394 goto err; 395 396 /* Pop the label */ 397 skb_pull(skb, sizeof(*hdr)); 398 skb_reset_network_header(skb); 399 400 skb_orphan(skb); 401 402 if (skb_warn_if_lro(skb)) 403 goto err; 404 405 skb_forward_csum(skb); 406 407 /* Verify ttl is valid */ 408 if (dec.ttl <= 1) 409 goto err; 410 dec.ttl -= 1; 411 412 /* Find the output device */ 413 out_dev = rcu_dereference(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 if (unlikely(!new_header_size && dec.bos)) { 435 /* Penultimate hop popping */ 436 if (!mpls_egress(dev_net(out_dev), rt, skb, dec)) 437 goto err; 438 } else { 439 bool bos; 440 int i; 441 skb_push(skb, new_header_size); 442 skb_reset_network_header(skb); 443 /* Push the new labels */ 444 hdr = mpls_hdr(skb); 445 bos = dec.bos; 446 for (i = nh->nh_labels - 1; i >= 0; i--) { 447 hdr[i] = mpls_entry_encode(nh->nh_label[i], 448 dec.ttl, 0, bos); 449 bos = false; 450 } 451 } 452 453 mpls_stats_inc_outucastpkts(out_dev, skb); 454 455 /* If via wasn't specified then send out using device address */ 456 if (nh->nh_via_table == MPLS_NEIGH_TABLE_UNSPEC) 457 err = neigh_xmit(NEIGH_LINK_TABLE, out_dev, 458 out_dev->dev_addr, skb); 459 else 460 err = neigh_xmit(nh->nh_via_table, out_dev, 461 mpls_nh_via(rt, nh), skb); 462 if (err) 463 net_dbg_ratelimited("%s: packet transmission failed: %d\n", 464 __func__, err); 465 return 0; 466 467 tx_err: 468 out_mdev = out_dev ? mpls_dev_get(out_dev) : NULL; 469 if (out_mdev) 470 MPLS_INC_STATS(out_mdev, tx_errors); 471 goto drop; 472 err: 473 MPLS_INC_STATS(mdev, rx_errors); 474 drop: 475 kfree_skb(skb); 476 return NET_RX_DROP; 477 } 478 479 static struct packet_type mpls_packet_type __read_mostly = { 480 .type = cpu_to_be16(ETH_P_MPLS_UC), 481 .func = mpls_forward, 482 }; 483 484 static const struct nla_policy rtm_mpls_policy[RTA_MAX+1] = { 485 [RTA_DST] = { .type = NLA_U32 }, 486 [RTA_OIF] = { .type = NLA_U32 }, 487 [RTA_TTL_PROPAGATE] = { .type = NLA_U8 }, 488 }; 489 490 struct mpls_route_config { 491 u32 rc_protocol; 492 u32 rc_ifindex; 493 u8 rc_via_table; 494 u8 rc_via_alen; 495 u8 rc_via[MAX_VIA_ALEN]; 496 u32 rc_label; 497 u8 rc_ttl_propagate; 498 u8 rc_output_labels; 499 u32 rc_output_label[MAX_NEW_LABELS]; 500 u32 rc_nlflags; 501 enum mpls_payload_type rc_payload_type; 502 struct nl_info rc_nlinfo; 503 struct rtnexthop *rc_mp; 504 int rc_mp_len; 505 }; 506 507 /* all nexthops within a route have the same size based on max 508 * number of labels and max via length for a hop 509 */ 510 static struct mpls_route *mpls_rt_alloc(u8 num_nh, u8 max_alen, u8 max_labels) 511 { 512 u8 nh_size = MPLS_NH_SIZE(max_labels, max_alen); 513 struct mpls_route *rt; 514 size_t size; 515 516 size = sizeof(*rt) + num_nh * nh_size; 517 if (size > MAX_MPLS_ROUTE_MEM) 518 return ERR_PTR(-EINVAL); 519 520 rt = kzalloc(size, GFP_KERNEL); 521 if (!rt) 522 return ERR_PTR(-ENOMEM); 523 524 rt->rt_nhn = num_nh; 525 rt->rt_nhn_alive = num_nh; 526 rt->rt_nh_size = nh_size; 527 rt->rt_via_offset = MPLS_NH_VIA_OFF(max_labels); 528 529 return rt; 530 } 531 532 static void mpls_rt_free(struct mpls_route *rt) 533 { 534 if (rt) 535 kfree_rcu(rt, rt_rcu); 536 } 537 538 static void mpls_notify_route(struct net *net, unsigned index, 539 struct mpls_route *old, struct mpls_route *new, 540 const struct nl_info *info) 541 { 542 struct nlmsghdr *nlh = info ? info->nlh : NULL; 543 unsigned portid = info ? info->portid : 0; 544 int event = new ? RTM_NEWROUTE : RTM_DELROUTE; 545 struct mpls_route *rt = new ? new : old; 546 unsigned nlm_flags = (old && new) ? NLM_F_REPLACE : 0; 547 /* Ignore reserved labels for now */ 548 if (rt && (index >= MPLS_LABEL_FIRST_UNRESERVED)) 549 rtmsg_lfib(event, index, rt, nlh, net, portid, nlm_flags); 550 } 551 552 static void mpls_route_update(struct net *net, unsigned index, 553 struct mpls_route *new, 554 const struct nl_info *info) 555 { 556 struct mpls_route __rcu **platform_label; 557 struct mpls_route *rt; 558 559 ASSERT_RTNL(); 560 561 platform_label = rtnl_dereference(net->mpls.platform_label); 562 rt = rtnl_dereference(platform_label[index]); 563 rcu_assign_pointer(platform_label[index], new); 564 565 mpls_notify_route(net, index, rt, new, info); 566 567 /* If we removed a route free it now */ 568 mpls_rt_free(rt); 569 } 570 571 static unsigned find_free_label(struct net *net) 572 { 573 struct mpls_route __rcu **platform_label; 574 size_t platform_labels; 575 unsigned index; 576 577 platform_label = rtnl_dereference(net->mpls.platform_label); 578 platform_labels = net->mpls.platform_labels; 579 for (index = MPLS_LABEL_FIRST_UNRESERVED; index < platform_labels; 580 index++) { 581 if (!rtnl_dereference(platform_label[index])) 582 return index; 583 } 584 return LABEL_NOT_SPECIFIED; 585 } 586 587 #if IS_ENABLED(CONFIG_INET) 588 static struct net_device *inet_fib_lookup_dev(struct net *net, 589 const void *addr) 590 { 591 struct net_device *dev; 592 struct rtable *rt; 593 struct in_addr daddr; 594 595 memcpy(&daddr, addr, sizeof(struct in_addr)); 596 rt = ip_route_output(net, daddr.s_addr, 0, 0, 0); 597 if (IS_ERR(rt)) 598 return ERR_CAST(rt); 599 600 dev = rt->dst.dev; 601 dev_hold(dev); 602 603 ip_rt_put(rt); 604 605 return dev; 606 } 607 #else 608 static struct net_device *inet_fib_lookup_dev(struct net *net, 609 const void *addr) 610 { 611 return ERR_PTR(-EAFNOSUPPORT); 612 } 613 #endif 614 615 #if IS_ENABLED(CONFIG_IPV6) 616 static struct net_device *inet6_fib_lookup_dev(struct net *net, 617 const void *addr) 618 { 619 struct net_device *dev; 620 struct dst_entry *dst; 621 struct flowi6 fl6; 622 623 if (!ipv6_stub) 624 return ERR_PTR(-EAFNOSUPPORT); 625 626 memset(&fl6, 0, sizeof(fl6)); 627 memcpy(&fl6.daddr, addr, sizeof(struct in6_addr)); 628 dst = ipv6_stub->ipv6_dst_lookup_flow(net, NULL, &fl6, NULL); 629 if (IS_ERR(dst)) 630 return ERR_CAST(dst); 631 632 dev = dst->dev; 633 dev_hold(dev); 634 dst_release(dst); 635 636 return dev; 637 } 638 #else 639 static struct net_device *inet6_fib_lookup_dev(struct net *net, 640 const void *addr) 641 { 642 return ERR_PTR(-EAFNOSUPPORT); 643 } 644 #endif 645 646 static struct net_device *find_outdev(struct net *net, 647 struct mpls_route *rt, 648 struct mpls_nh *nh, int oif) 649 { 650 struct net_device *dev = NULL; 651 652 if (!oif) { 653 switch (nh->nh_via_table) { 654 case NEIGH_ARP_TABLE: 655 dev = inet_fib_lookup_dev(net, mpls_nh_via(rt, nh)); 656 break; 657 case NEIGH_ND_TABLE: 658 dev = inet6_fib_lookup_dev(net, mpls_nh_via(rt, nh)); 659 break; 660 case NEIGH_LINK_TABLE: 661 break; 662 } 663 } else { 664 dev = dev_get_by_index(net, oif); 665 } 666 667 if (!dev) 668 return ERR_PTR(-ENODEV); 669 670 if (IS_ERR(dev)) 671 return dev; 672 673 /* The caller is holding rtnl anyways, so release the dev reference */ 674 dev_put(dev); 675 676 return dev; 677 } 678 679 static int mpls_nh_assign_dev(struct net *net, struct mpls_route *rt, 680 struct mpls_nh *nh, int oif) 681 { 682 struct net_device *dev = NULL; 683 int err = -ENODEV; 684 685 dev = find_outdev(net, rt, nh, oif); 686 if (IS_ERR(dev)) { 687 err = PTR_ERR(dev); 688 dev = NULL; 689 goto errout; 690 } 691 692 /* Ensure this is a supported device */ 693 err = -EINVAL; 694 if (!mpls_dev_get(dev)) 695 goto errout; 696 697 if ((nh->nh_via_table == NEIGH_LINK_TABLE) && 698 (dev->addr_len != nh->nh_via_alen)) 699 goto errout; 700 701 RCU_INIT_POINTER(nh->nh_dev, dev); 702 703 if (!(dev->flags & IFF_UP)) { 704 nh->nh_flags |= RTNH_F_DEAD; 705 } else { 706 unsigned int flags; 707 708 flags = dev_get_flags(dev); 709 if (!(flags & (IFF_RUNNING | IFF_LOWER_UP))) 710 nh->nh_flags |= RTNH_F_LINKDOWN; 711 } 712 713 return 0; 714 715 errout: 716 return err; 717 } 718 719 static int nla_get_via(const struct nlattr *nla, u8 *via_alen, u8 *via_table, 720 u8 via_addr[], struct netlink_ext_ack *extack) 721 { 722 struct rtvia *via = nla_data(nla); 723 int err = -EINVAL; 724 int alen; 725 726 if (nla_len(nla) < offsetof(struct rtvia, rtvia_addr)) { 727 NL_SET_ERR_MSG_ATTR(extack, nla, 728 "Invalid attribute length for RTA_VIA"); 729 goto errout; 730 } 731 alen = nla_len(nla) - 732 offsetof(struct rtvia, rtvia_addr); 733 if (alen > MAX_VIA_ALEN) { 734 NL_SET_ERR_MSG_ATTR(extack, nla, 735 "Invalid address length for RTA_VIA"); 736 goto errout; 737 } 738 739 /* Validate the address family */ 740 switch (via->rtvia_family) { 741 case AF_PACKET: 742 *via_table = NEIGH_LINK_TABLE; 743 break; 744 case AF_INET: 745 *via_table = NEIGH_ARP_TABLE; 746 if (alen != 4) 747 goto errout; 748 break; 749 case AF_INET6: 750 *via_table = NEIGH_ND_TABLE; 751 if (alen != 16) 752 goto errout; 753 break; 754 default: 755 /* Unsupported address family */ 756 goto errout; 757 } 758 759 memcpy(via_addr, via->rtvia_addr, alen); 760 *via_alen = alen; 761 err = 0; 762 763 errout: 764 return err; 765 } 766 767 static int mpls_nh_build_from_cfg(struct mpls_route_config *cfg, 768 struct mpls_route *rt) 769 { 770 struct net *net = cfg->rc_nlinfo.nl_net; 771 struct mpls_nh *nh = rt->rt_nh; 772 int err; 773 int i; 774 775 if (!nh) 776 return -ENOMEM; 777 778 nh->nh_labels = cfg->rc_output_labels; 779 for (i = 0; i < nh->nh_labels; i++) 780 nh->nh_label[i] = cfg->rc_output_label[i]; 781 782 nh->nh_via_table = cfg->rc_via_table; 783 memcpy(__mpls_nh_via(rt, nh), cfg->rc_via, cfg->rc_via_alen); 784 nh->nh_via_alen = cfg->rc_via_alen; 785 786 err = mpls_nh_assign_dev(net, rt, nh, cfg->rc_ifindex); 787 if (err) 788 goto errout; 789 790 if (nh->nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)) 791 rt->rt_nhn_alive--; 792 793 return 0; 794 795 errout: 796 return err; 797 } 798 799 static int mpls_nh_build(struct net *net, struct mpls_route *rt, 800 struct mpls_nh *nh, int oif, struct nlattr *via, 801 struct nlattr *newdst, u8 max_labels, 802 struct netlink_ext_ack *extack) 803 { 804 int err = -ENOMEM; 805 806 if (!nh) 807 goto errout; 808 809 if (newdst) { 810 err = nla_get_labels(newdst, max_labels, &nh->nh_labels, 811 nh->nh_label, extack); 812 if (err) 813 goto errout; 814 } 815 816 if (via) { 817 err = nla_get_via(via, &nh->nh_via_alen, &nh->nh_via_table, 818 __mpls_nh_via(rt, nh), extack); 819 if (err) 820 goto errout; 821 } else { 822 nh->nh_via_table = MPLS_NEIGH_TABLE_UNSPEC; 823 } 824 825 err = mpls_nh_assign_dev(net, rt, nh, oif); 826 if (err) 827 goto errout; 828 829 return 0; 830 831 errout: 832 return err; 833 } 834 835 static u8 mpls_count_nexthops(struct rtnexthop *rtnh, int len, 836 u8 cfg_via_alen, u8 *max_via_alen, 837 u8 *max_labels) 838 { 839 int remaining = len; 840 u8 nhs = 0; 841 842 *max_via_alen = 0; 843 *max_labels = 0; 844 845 while (rtnh_ok(rtnh, remaining)) { 846 struct nlattr *nla, *attrs = rtnh_attrs(rtnh); 847 int attrlen; 848 u8 n_labels = 0; 849 850 attrlen = rtnh_attrlen(rtnh); 851 nla = nla_find(attrs, attrlen, RTA_VIA); 852 if (nla && nla_len(nla) >= 853 offsetof(struct rtvia, rtvia_addr)) { 854 int via_alen = nla_len(nla) - 855 offsetof(struct rtvia, rtvia_addr); 856 857 if (via_alen <= MAX_VIA_ALEN) 858 *max_via_alen = max_t(u16, *max_via_alen, 859 via_alen); 860 } 861 862 nla = nla_find(attrs, attrlen, RTA_NEWDST); 863 if (nla && 864 nla_get_labels(nla, MAX_NEW_LABELS, &n_labels, 865 NULL, NULL) != 0) 866 return 0; 867 868 *max_labels = max_t(u8, *max_labels, n_labels); 869 870 /* number of nexthops is tracked by a u8. 871 * Check for overflow. 872 */ 873 if (nhs == 255) 874 return 0; 875 nhs++; 876 877 rtnh = rtnh_next(rtnh, &remaining); 878 } 879 880 /* leftover implies invalid nexthop configuration, discard it */ 881 return remaining > 0 ? 0 : nhs; 882 } 883 884 static int mpls_nh_build_multi(struct mpls_route_config *cfg, 885 struct mpls_route *rt, u8 max_labels, 886 struct netlink_ext_ack *extack) 887 { 888 struct rtnexthop *rtnh = cfg->rc_mp; 889 struct nlattr *nla_via, *nla_newdst; 890 int remaining = cfg->rc_mp_len; 891 int err = 0; 892 u8 nhs = 0; 893 894 change_nexthops(rt) { 895 int attrlen; 896 897 nla_via = NULL; 898 nla_newdst = NULL; 899 900 err = -EINVAL; 901 if (!rtnh_ok(rtnh, remaining)) 902 goto errout; 903 904 /* neither weighted multipath nor any flags 905 * are supported 906 */ 907 if (rtnh->rtnh_hops || rtnh->rtnh_flags) 908 goto errout; 909 910 attrlen = rtnh_attrlen(rtnh); 911 if (attrlen > 0) { 912 struct nlattr *attrs = rtnh_attrs(rtnh); 913 914 nla_via = nla_find(attrs, attrlen, RTA_VIA); 915 nla_newdst = nla_find(attrs, attrlen, RTA_NEWDST); 916 } 917 918 err = mpls_nh_build(cfg->rc_nlinfo.nl_net, rt, nh, 919 rtnh->rtnh_ifindex, nla_via, nla_newdst, 920 max_labels, extack); 921 if (err) 922 goto errout; 923 924 if (nh->nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)) 925 rt->rt_nhn_alive--; 926 927 rtnh = rtnh_next(rtnh, &remaining); 928 nhs++; 929 } endfor_nexthops(rt); 930 931 rt->rt_nhn = nhs; 932 933 return 0; 934 935 errout: 936 return err; 937 } 938 939 static bool mpls_label_ok(struct net *net, unsigned int *index, 940 struct netlink_ext_ack *extack) 941 { 942 bool is_ok = true; 943 944 /* Reserved labels may not be set */ 945 if (*index < MPLS_LABEL_FIRST_UNRESERVED) { 946 NL_SET_ERR_MSG(extack, 947 "Invalid label - must be MPLS_LABEL_FIRST_UNRESERVED or higher"); 948 is_ok = false; 949 } 950 951 /* The full 20 bit range may not be supported. */ 952 if (is_ok && *index >= net->mpls.platform_labels) { 953 NL_SET_ERR_MSG(extack, 954 "Label >= configured maximum in platform_labels"); 955 is_ok = false; 956 } 957 958 *index = array_index_nospec(*index, net->mpls.platform_labels); 959 return is_ok; 960 } 961 962 static int mpls_route_add(struct mpls_route_config *cfg, 963 struct netlink_ext_ack *extack) 964 { 965 struct mpls_route __rcu **platform_label; 966 struct net *net = cfg->rc_nlinfo.nl_net; 967 struct mpls_route *rt, *old; 968 int err = -EINVAL; 969 u8 max_via_alen; 970 unsigned index; 971 u8 max_labels; 972 u8 nhs; 973 974 index = cfg->rc_label; 975 976 /* If a label was not specified during insert pick one */ 977 if ((index == LABEL_NOT_SPECIFIED) && 978 (cfg->rc_nlflags & NLM_F_CREATE)) { 979 index = find_free_label(net); 980 } 981 982 if (!mpls_label_ok(net, &index, extack)) 983 goto errout; 984 985 /* Append makes no sense with mpls */ 986 err = -EOPNOTSUPP; 987 if (cfg->rc_nlflags & NLM_F_APPEND) { 988 NL_SET_ERR_MSG(extack, "MPLS does not support route append"); 989 goto errout; 990 } 991 992 err = -EEXIST; 993 platform_label = rtnl_dereference(net->mpls.platform_label); 994 old = rtnl_dereference(platform_label[index]); 995 if ((cfg->rc_nlflags & NLM_F_EXCL) && old) 996 goto errout; 997 998 err = -EEXIST; 999 if (!(cfg->rc_nlflags & NLM_F_REPLACE) && old) 1000 goto errout; 1001 1002 err = -ENOENT; 1003 if (!(cfg->rc_nlflags & NLM_F_CREATE) && !old) 1004 goto errout; 1005 1006 err = -EINVAL; 1007 if (cfg->rc_mp) { 1008 nhs = mpls_count_nexthops(cfg->rc_mp, cfg->rc_mp_len, 1009 cfg->rc_via_alen, &max_via_alen, 1010 &max_labels); 1011 } else { 1012 max_via_alen = cfg->rc_via_alen; 1013 max_labels = cfg->rc_output_labels; 1014 nhs = 1; 1015 } 1016 1017 if (nhs == 0) { 1018 NL_SET_ERR_MSG(extack, "Route does not contain a nexthop"); 1019 goto errout; 1020 } 1021 1022 err = -ENOMEM; 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 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 hlist_head *head; 1307 struct net_device *dev; 1308 struct mpls_dev *mdev; 1309 int idx, s_idx; 1310 int h, s_h; 1311 1312 if (cb->strict_check) { 1313 struct netlink_ext_ack *extack = cb->extack; 1314 struct netconfmsg *ncm; 1315 1316 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) { 1317 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request"); 1318 return -EINVAL; 1319 } 1320 1321 if (nlmsg_attrlen(nlh, sizeof(*ncm))) { 1322 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request"); 1323 return -EINVAL; 1324 } 1325 } 1326 1327 s_h = cb->args[0]; 1328 s_idx = idx = cb->args[1]; 1329 1330 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 1331 idx = 0; 1332 head = &net->dev_index_head[h]; 1333 rcu_read_lock(); 1334 cb->seq = net->dev_base_seq; 1335 hlist_for_each_entry_rcu(dev, head, index_hlist) { 1336 if (idx < s_idx) 1337 goto cont; 1338 mdev = mpls_dev_get(dev); 1339 if (!mdev) 1340 goto cont; 1341 if (mpls_netconf_fill_devconf(skb, mdev, 1342 NETLINK_CB(cb->skb).portid, 1343 nlh->nlmsg_seq, 1344 RTM_NEWNETCONF, 1345 NLM_F_MULTI, 1346 NETCONFA_ALL) < 0) { 1347 rcu_read_unlock(); 1348 goto done; 1349 } 1350 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 1351 cont: 1352 idx++; 1353 } 1354 rcu_read_unlock(); 1355 } 1356 done: 1357 cb->args[0] = h; 1358 cb->args[1] = idx; 1359 1360 return skb->len; 1361 } 1362 1363 #define MPLS_PERDEV_SYSCTL_OFFSET(field) \ 1364 (&((struct mpls_dev *)0)->field) 1365 1366 static int mpls_conf_proc(struct ctl_table *ctl, int write, 1367 void *buffer, size_t *lenp, loff_t *ppos) 1368 { 1369 int oval = *(int *)ctl->data; 1370 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 1371 1372 if (write) { 1373 struct mpls_dev *mdev = ctl->extra1; 1374 int i = (int *)ctl->data - (int *)mdev; 1375 struct net *net = ctl->extra2; 1376 int val = *(int *)ctl->data; 1377 1378 if (i == offsetof(struct mpls_dev, input_enabled) && 1379 val != oval) { 1380 mpls_netconf_notify_devconf(net, RTM_NEWNETCONF, 1381 NETCONFA_INPUT, mdev); 1382 } 1383 } 1384 1385 return ret; 1386 } 1387 1388 static const struct ctl_table mpls_dev_table[] = { 1389 { 1390 .procname = "input", 1391 .maxlen = sizeof(int), 1392 .mode = 0644, 1393 .proc_handler = mpls_conf_proc, 1394 .data = MPLS_PERDEV_SYSCTL_OFFSET(input_enabled), 1395 }, 1396 { } 1397 }; 1398 1399 static int mpls_dev_sysctl_register(struct net_device *dev, 1400 struct mpls_dev *mdev) 1401 { 1402 char path[sizeof("net/mpls/conf/") + IFNAMSIZ]; 1403 struct net *net = dev_net(dev); 1404 struct ctl_table *table; 1405 int i; 1406 1407 table = kmemdup(&mpls_dev_table, sizeof(mpls_dev_table), GFP_KERNEL); 1408 if (!table) 1409 goto out; 1410 1411 /* Table data contains only offsets relative to the base of 1412 * the mdev at this point, so make them absolute. 1413 */ 1414 for (i = 0; i < ARRAY_SIZE(mpls_dev_table); i++) { 1415 table[i].data = (char *)mdev + (uintptr_t)table[i].data; 1416 table[i].extra1 = mdev; 1417 table[i].extra2 = net; 1418 } 1419 1420 snprintf(path, sizeof(path), "net/mpls/conf/%s", dev->name); 1421 1422 mdev->sysctl = register_net_sysctl(net, path, table); 1423 if (!mdev->sysctl) 1424 goto free; 1425 1426 mpls_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, mdev); 1427 return 0; 1428 1429 free: 1430 kfree(table); 1431 out: 1432 return -ENOBUFS; 1433 } 1434 1435 static void mpls_dev_sysctl_unregister(struct net_device *dev, 1436 struct mpls_dev *mdev) 1437 { 1438 struct net *net = dev_net(dev); 1439 struct ctl_table *table; 1440 1441 table = mdev->sysctl->ctl_table_arg; 1442 unregister_net_sysctl_table(mdev->sysctl); 1443 kfree(table); 1444 1445 mpls_netconf_notify_devconf(net, RTM_DELNETCONF, 0, mdev); 1446 } 1447 1448 static struct mpls_dev *mpls_add_dev(struct net_device *dev) 1449 { 1450 struct mpls_dev *mdev; 1451 int err = -ENOMEM; 1452 int i; 1453 1454 ASSERT_RTNL(); 1455 1456 mdev = kzalloc(sizeof(*mdev), GFP_KERNEL); 1457 if (!mdev) 1458 return ERR_PTR(err); 1459 1460 mdev->stats = alloc_percpu(struct mpls_pcpu_stats); 1461 if (!mdev->stats) 1462 goto free; 1463 1464 for_each_possible_cpu(i) { 1465 struct mpls_pcpu_stats *mpls_stats; 1466 1467 mpls_stats = per_cpu_ptr(mdev->stats, i); 1468 u64_stats_init(&mpls_stats->syncp); 1469 } 1470 1471 mdev->dev = dev; 1472 1473 err = mpls_dev_sysctl_register(dev, mdev); 1474 if (err) 1475 goto free; 1476 1477 rcu_assign_pointer(dev->mpls_ptr, mdev); 1478 1479 return mdev; 1480 1481 free: 1482 free_percpu(mdev->stats); 1483 kfree(mdev); 1484 return ERR_PTR(err); 1485 } 1486 1487 static void mpls_dev_destroy_rcu(struct rcu_head *head) 1488 { 1489 struct mpls_dev *mdev = container_of(head, struct mpls_dev, rcu); 1490 1491 free_percpu(mdev->stats); 1492 kfree(mdev); 1493 } 1494 1495 static void mpls_ifdown(struct net_device *dev, int event) 1496 { 1497 struct mpls_route __rcu **platform_label; 1498 struct net *net = dev_net(dev); 1499 u8 alive, deleted; 1500 unsigned index; 1501 1502 platform_label = rtnl_dereference(net->mpls.platform_label); 1503 for (index = 0; index < net->mpls.platform_labels; index++) { 1504 struct mpls_route *rt = rtnl_dereference(platform_label[index]); 1505 1506 if (!rt) 1507 continue; 1508 1509 alive = 0; 1510 deleted = 0; 1511 change_nexthops(rt) { 1512 unsigned int nh_flags = nh->nh_flags; 1513 1514 if (rtnl_dereference(nh->nh_dev) != dev) 1515 goto next; 1516 1517 switch (event) { 1518 case NETDEV_DOWN: 1519 case NETDEV_UNREGISTER: 1520 nh_flags |= RTNH_F_DEAD; 1521 fallthrough; 1522 case NETDEV_CHANGE: 1523 nh_flags |= RTNH_F_LINKDOWN; 1524 break; 1525 } 1526 if (event == NETDEV_UNREGISTER) 1527 RCU_INIT_POINTER(nh->nh_dev, NULL); 1528 1529 if (nh->nh_flags != nh_flags) 1530 WRITE_ONCE(nh->nh_flags, nh_flags); 1531 next: 1532 if (!(nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN))) 1533 alive++; 1534 if (!rtnl_dereference(nh->nh_dev)) 1535 deleted++; 1536 } endfor_nexthops(rt); 1537 1538 WRITE_ONCE(rt->rt_nhn_alive, alive); 1539 1540 /* if there are no more nexthops, delete the route */ 1541 if (event == NETDEV_UNREGISTER && deleted == rt->rt_nhn) 1542 mpls_route_update(net, index, NULL, NULL); 1543 } 1544 } 1545 1546 static void mpls_ifup(struct net_device *dev, unsigned int flags) 1547 { 1548 struct mpls_route __rcu **platform_label; 1549 struct net *net = dev_net(dev); 1550 unsigned index; 1551 u8 alive; 1552 1553 platform_label = rtnl_dereference(net->mpls.platform_label); 1554 for (index = 0; index < net->mpls.platform_labels; index++) { 1555 struct mpls_route *rt = rtnl_dereference(platform_label[index]); 1556 1557 if (!rt) 1558 continue; 1559 1560 alive = 0; 1561 change_nexthops(rt) { 1562 unsigned int nh_flags = nh->nh_flags; 1563 struct net_device *nh_dev = 1564 rtnl_dereference(nh->nh_dev); 1565 1566 if (!(nh_flags & flags)) { 1567 alive++; 1568 continue; 1569 } 1570 if (nh_dev != dev) 1571 continue; 1572 alive++; 1573 nh_flags &= ~flags; 1574 WRITE_ONCE(nh->nh_flags, nh_flags); 1575 } endfor_nexthops(rt); 1576 1577 WRITE_ONCE(rt->rt_nhn_alive, alive); 1578 } 1579 } 1580 1581 static int mpls_dev_notify(struct notifier_block *this, unsigned long event, 1582 void *ptr) 1583 { 1584 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1585 struct mpls_dev *mdev; 1586 unsigned int flags; 1587 1588 if (event == NETDEV_REGISTER) { 1589 mdev = mpls_add_dev(dev); 1590 if (IS_ERR(mdev)) 1591 return notifier_from_errno(PTR_ERR(mdev)); 1592 1593 return NOTIFY_OK; 1594 } 1595 1596 mdev = mpls_dev_get(dev); 1597 if (!mdev) 1598 return NOTIFY_OK; 1599 1600 switch (event) { 1601 case NETDEV_DOWN: 1602 mpls_ifdown(dev, event); 1603 break; 1604 case NETDEV_UP: 1605 flags = dev_get_flags(dev); 1606 if (flags & (IFF_RUNNING | IFF_LOWER_UP)) 1607 mpls_ifup(dev, RTNH_F_DEAD | RTNH_F_LINKDOWN); 1608 else 1609 mpls_ifup(dev, RTNH_F_DEAD); 1610 break; 1611 case NETDEV_CHANGE: 1612 flags = dev_get_flags(dev); 1613 if (flags & (IFF_RUNNING | IFF_LOWER_UP)) 1614 mpls_ifup(dev, RTNH_F_DEAD | RTNH_F_LINKDOWN); 1615 else 1616 mpls_ifdown(dev, event); 1617 break; 1618 case NETDEV_UNREGISTER: 1619 mpls_ifdown(dev, event); 1620 mdev = mpls_dev_get(dev); 1621 if (mdev) { 1622 mpls_dev_sysctl_unregister(dev, mdev); 1623 RCU_INIT_POINTER(dev->mpls_ptr, NULL); 1624 call_rcu(&mdev->rcu, mpls_dev_destroy_rcu); 1625 } 1626 break; 1627 case NETDEV_CHANGENAME: 1628 mdev = mpls_dev_get(dev); 1629 if (mdev) { 1630 int err; 1631 1632 mpls_dev_sysctl_unregister(dev, mdev); 1633 err = mpls_dev_sysctl_register(dev, mdev); 1634 if (err) 1635 return notifier_from_errno(err); 1636 } 1637 break; 1638 } 1639 return NOTIFY_OK; 1640 } 1641 1642 static struct notifier_block mpls_dev_notifier = { 1643 .notifier_call = mpls_dev_notify, 1644 }; 1645 1646 static int nla_put_via(struct sk_buff *skb, 1647 u8 table, const void *addr, int alen) 1648 { 1649 static const int table_to_family[NEIGH_NR_TABLES + 1] = { 1650 AF_INET, AF_INET6, AF_DECnet, AF_PACKET, 1651 }; 1652 struct nlattr *nla; 1653 struct rtvia *via; 1654 int family = AF_UNSPEC; 1655 1656 nla = nla_reserve(skb, RTA_VIA, alen + 2); 1657 if (!nla) 1658 return -EMSGSIZE; 1659 1660 if (table <= NEIGH_NR_TABLES) 1661 family = table_to_family[table]; 1662 1663 via = nla_data(nla); 1664 via->rtvia_family = family; 1665 memcpy(via->rtvia_addr, addr, alen); 1666 return 0; 1667 } 1668 1669 int nla_put_labels(struct sk_buff *skb, int attrtype, 1670 u8 labels, const u32 label[]) 1671 { 1672 struct nlattr *nla; 1673 struct mpls_shim_hdr *nla_label; 1674 bool bos; 1675 int i; 1676 nla = nla_reserve(skb, attrtype, labels*4); 1677 if (!nla) 1678 return -EMSGSIZE; 1679 1680 nla_label = nla_data(nla); 1681 bos = true; 1682 for (i = labels - 1; i >= 0; i--) { 1683 nla_label[i] = mpls_entry_encode(label[i], 0, 0, bos); 1684 bos = false; 1685 } 1686 1687 return 0; 1688 } 1689 EXPORT_SYMBOL_GPL(nla_put_labels); 1690 1691 int nla_get_labels(const struct nlattr *nla, u8 max_labels, u8 *labels, 1692 u32 label[], struct netlink_ext_ack *extack) 1693 { 1694 unsigned len = nla_len(nla); 1695 struct mpls_shim_hdr *nla_label; 1696 u8 nla_labels; 1697 bool bos; 1698 int i; 1699 1700 /* len needs to be an even multiple of 4 (the label size). Number 1701 * of labels is a u8 so check for overflow. 1702 */ 1703 if (len & 3 || len / 4 > 255) { 1704 NL_SET_ERR_MSG_ATTR(extack, nla, 1705 "Invalid length for labels attribute"); 1706 return -EINVAL; 1707 } 1708 1709 /* Limit the number of new labels allowed */ 1710 nla_labels = len/4; 1711 if (nla_labels > max_labels) { 1712 NL_SET_ERR_MSG(extack, "Too many labels"); 1713 return -EINVAL; 1714 } 1715 1716 /* when label == NULL, caller wants number of labels */ 1717 if (!label) 1718 goto out; 1719 1720 nla_label = nla_data(nla); 1721 bos = true; 1722 for (i = nla_labels - 1; i >= 0; i--, bos = false) { 1723 struct mpls_entry_decoded dec; 1724 dec = mpls_entry_decode(nla_label + i); 1725 1726 /* Ensure the bottom of stack flag is properly set 1727 * and ttl and tc are both clear. 1728 */ 1729 if (dec.ttl) { 1730 NL_SET_ERR_MSG_ATTR(extack, nla, 1731 "TTL in label must be 0"); 1732 return -EINVAL; 1733 } 1734 1735 if (dec.tc) { 1736 NL_SET_ERR_MSG_ATTR(extack, nla, 1737 "Traffic class in label must be 0"); 1738 return -EINVAL; 1739 } 1740 1741 if (dec.bos != bos) { 1742 NL_SET_BAD_ATTR(extack, nla); 1743 if (bos) { 1744 NL_SET_ERR_MSG(extack, 1745 "BOS bit must be set in first label"); 1746 } else { 1747 NL_SET_ERR_MSG(extack, 1748 "BOS bit can only be set in first label"); 1749 } 1750 return -EINVAL; 1751 } 1752 1753 switch (dec.label) { 1754 case MPLS_LABEL_IMPLNULL: 1755 /* RFC3032: This is a label that an LSR may 1756 * assign and distribute, but which never 1757 * actually appears in the encapsulation. 1758 */ 1759 NL_SET_ERR_MSG_ATTR(extack, nla, 1760 "Implicit NULL Label (3) can not be used in encapsulation"); 1761 return -EINVAL; 1762 } 1763 1764 label[i] = dec.label; 1765 } 1766 out: 1767 *labels = nla_labels; 1768 return 0; 1769 } 1770 EXPORT_SYMBOL_GPL(nla_get_labels); 1771 1772 static int rtm_to_route_config(struct sk_buff *skb, 1773 struct nlmsghdr *nlh, 1774 struct mpls_route_config *cfg, 1775 struct netlink_ext_ack *extack) 1776 { 1777 struct rtmsg *rtm; 1778 struct nlattr *tb[RTA_MAX+1]; 1779 int index; 1780 int err; 1781 1782 err = nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX, 1783 rtm_mpls_policy, extack); 1784 if (err < 0) 1785 goto errout; 1786 1787 err = -EINVAL; 1788 rtm = nlmsg_data(nlh); 1789 1790 if (rtm->rtm_family != AF_MPLS) { 1791 NL_SET_ERR_MSG(extack, "Invalid address family in rtmsg"); 1792 goto errout; 1793 } 1794 if (rtm->rtm_dst_len != 20) { 1795 NL_SET_ERR_MSG(extack, "rtm_dst_len must be 20 for MPLS"); 1796 goto errout; 1797 } 1798 if (rtm->rtm_src_len != 0) { 1799 NL_SET_ERR_MSG(extack, "rtm_src_len must be 0 for MPLS"); 1800 goto errout; 1801 } 1802 if (rtm->rtm_tos != 0) { 1803 NL_SET_ERR_MSG(extack, "rtm_tos must be 0 for MPLS"); 1804 goto errout; 1805 } 1806 if (rtm->rtm_table != RT_TABLE_MAIN) { 1807 NL_SET_ERR_MSG(extack, 1808 "MPLS only supports the main route table"); 1809 goto errout; 1810 } 1811 /* Any value is acceptable for rtm_protocol */ 1812 1813 /* As mpls uses destination specific addresses 1814 * (or source specific address in the case of multicast) 1815 * all addresses have universal scope. 1816 */ 1817 if (rtm->rtm_scope != RT_SCOPE_UNIVERSE) { 1818 NL_SET_ERR_MSG(extack, 1819 "Invalid route scope - MPLS only supports UNIVERSE"); 1820 goto errout; 1821 } 1822 if (rtm->rtm_type != RTN_UNICAST) { 1823 NL_SET_ERR_MSG(extack, 1824 "Invalid route type - MPLS only supports UNICAST"); 1825 goto errout; 1826 } 1827 if (rtm->rtm_flags != 0) { 1828 NL_SET_ERR_MSG(extack, "rtm_flags must be 0 for MPLS"); 1829 goto errout; 1830 } 1831 1832 cfg->rc_label = LABEL_NOT_SPECIFIED; 1833 cfg->rc_protocol = rtm->rtm_protocol; 1834 cfg->rc_via_table = MPLS_NEIGH_TABLE_UNSPEC; 1835 cfg->rc_ttl_propagate = MPLS_TTL_PROP_DEFAULT; 1836 cfg->rc_nlflags = nlh->nlmsg_flags; 1837 cfg->rc_nlinfo.portid = NETLINK_CB(skb).portid; 1838 cfg->rc_nlinfo.nlh = nlh; 1839 cfg->rc_nlinfo.nl_net = sock_net(skb->sk); 1840 1841 for (index = 0; index <= RTA_MAX; index++) { 1842 struct nlattr *nla = tb[index]; 1843 if (!nla) 1844 continue; 1845 1846 switch (index) { 1847 case RTA_OIF: 1848 cfg->rc_ifindex = nla_get_u32(nla); 1849 break; 1850 case RTA_NEWDST: 1851 if (nla_get_labels(nla, MAX_NEW_LABELS, 1852 &cfg->rc_output_labels, 1853 cfg->rc_output_label, extack)) 1854 goto errout; 1855 break; 1856 case RTA_DST: 1857 { 1858 u8 label_count; 1859 if (nla_get_labels(nla, 1, &label_count, 1860 &cfg->rc_label, extack)) 1861 goto errout; 1862 1863 if (!mpls_label_ok(cfg->rc_nlinfo.nl_net, 1864 &cfg->rc_label, extack)) 1865 goto errout; 1866 break; 1867 } 1868 case RTA_GATEWAY: 1869 NL_SET_ERR_MSG(extack, "MPLS does not support RTA_GATEWAY attribute"); 1870 goto errout; 1871 case RTA_VIA: 1872 { 1873 if (nla_get_via(nla, &cfg->rc_via_alen, 1874 &cfg->rc_via_table, cfg->rc_via, 1875 extack)) 1876 goto errout; 1877 break; 1878 } 1879 case RTA_MULTIPATH: 1880 { 1881 cfg->rc_mp = nla_data(nla); 1882 cfg->rc_mp_len = nla_len(nla); 1883 break; 1884 } 1885 case RTA_TTL_PROPAGATE: 1886 { 1887 u8 ttl_propagate = nla_get_u8(nla); 1888 1889 if (ttl_propagate > 1) { 1890 NL_SET_ERR_MSG_ATTR(extack, nla, 1891 "RTA_TTL_PROPAGATE can only be 0 or 1"); 1892 goto errout; 1893 } 1894 cfg->rc_ttl_propagate = ttl_propagate ? 1895 MPLS_TTL_PROP_ENABLED : 1896 MPLS_TTL_PROP_DISABLED; 1897 break; 1898 } 1899 default: 1900 NL_SET_ERR_MSG_ATTR(extack, nla, "Unknown attribute"); 1901 /* Unsupported attribute */ 1902 goto errout; 1903 } 1904 } 1905 1906 err = 0; 1907 errout: 1908 return err; 1909 } 1910 1911 static int mpls_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, 1912 struct netlink_ext_ack *extack) 1913 { 1914 struct mpls_route_config *cfg; 1915 int err; 1916 1917 cfg = kzalloc(sizeof(*cfg), GFP_KERNEL); 1918 if (!cfg) 1919 return -ENOMEM; 1920 1921 err = rtm_to_route_config(skb, nlh, cfg, extack); 1922 if (err < 0) 1923 goto out; 1924 1925 err = mpls_route_del(cfg, extack); 1926 out: 1927 kfree(cfg); 1928 1929 return err; 1930 } 1931 1932 1933 static int mpls_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, 1934 struct netlink_ext_ack *extack) 1935 { 1936 struct mpls_route_config *cfg; 1937 int err; 1938 1939 cfg = kzalloc(sizeof(*cfg), GFP_KERNEL); 1940 if (!cfg) 1941 return -ENOMEM; 1942 1943 err = rtm_to_route_config(skb, nlh, cfg, extack); 1944 if (err < 0) 1945 goto out; 1946 1947 err = mpls_route_add(cfg, extack); 1948 out: 1949 kfree(cfg); 1950 1951 return err; 1952 } 1953 1954 static int mpls_dump_route(struct sk_buff *skb, u32 portid, u32 seq, int event, 1955 u32 label, struct mpls_route *rt, int flags) 1956 { 1957 struct net_device *dev; 1958 struct nlmsghdr *nlh; 1959 struct rtmsg *rtm; 1960 1961 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*rtm), flags); 1962 if (nlh == NULL) 1963 return -EMSGSIZE; 1964 1965 rtm = nlmsg_data(nlh); 1966 rtm->rtm_family = AF_MPLS; 1967 rtm->rtm_dst_len = 20; 1968 rtm->rtm_src_len = 0; 1969 rtm->rtm_tos = 0; 1970 rtm->rtm_table = RT_TABLE_MAIN; 1971 rtm->rtm_protocol = rt->rt_protocol; 1972 rtm->rtm_scope = RT_SCOPE_UNIVERSE; 1973 rtm->rtm_type = RTN_UNICAST; 1974 rtm->rtm_flags = 0; 1975 1976 if (nla_put_labels(skb, RTA_DST, 1, &label)) 1977 goto nla_put_failure; 1978 1979 if (rt->rt_ttl_propagate != MPLS_TTL_PROP_DEFAULT) { 1980 bool ttl_propagate = 1981 rt->rt_ttl_propagate == MPLS_TTL_PROP_ENABLED; 1982 1983 if (nla_put_u8(skb, RTA_TTL_PROPAGATE, 1984 ttl_propagate)) 1985 goto nla_put_failure; 1986 } 1987 if (rt->rt_nhn == 1) { 1988 const struct mpls_nh *nh = rt->rt_nh; 1989 1990 if (nh->nh_labels && 1991 nla_put_labels(skb, RTA_NEWDST, nh->nh_labels, 1992 nh->nh_label)) 1993 goto nla_put_failure; 1994 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC && 1995 nla_put_via(skb, nh->nh_via_table, mpls_nh_via(rt, nh), 1996 nh->nh_via_alen)) 1997 goto nla_put_failure; 1998 dev = rtnl_dereference(nh->nh_dev); 1999 if (dev && nla_put_u32(skb, RTA_OIF, dev->ifindex)) 2000 goto nla_put_failure; 2001 if (nh->nh_flags & RTNH_F_LINKDOWN) 2002 rtm->rtm_flags |= RTNH_F_LINKDOWN; 2003 if (nh->nh_flags & RTNH_F_DEAD) 2004 rtm->rtm_flags |= RTNH_F_DEAD; 2005 } else { 2006 struct rtnexthop *rtnh; 2007 struct nlattr *mp; 2008 u8 linkdown = 0; 2009 u8 dead = 0; 2010 2011 mp = nla_nest_start_noflag(skb, RTA_MULTIPATH); 2012 if (!mp) 2013 goto nla_put_failure; 2014 2015 for_nexthops(rt) { 2016 dev = rtnl_dereference(nh->nh_dev); 2017 if (!dev) 2018 continue; 2019 2020 rtnh = nla_reserve_nohdr(skb, sizeof(*rtnh)); 2021 if (!rtnh) 2022 goto nla_put_failure; 2023 2024 rtnh->rtnh_ifindex = dev->ifindex; 2025 if (nh->nh_flags & RTNH_F_LINKDOWN) { 2026 rtnh->rtnh_flags |= RTNH_F_LINKDOWN; 2027 linkdown++; 2028 } 2029 if (nh->nh_flags & RTNH_F_DEAD) { 2030 rtnh->rtnh_flags |= RTNH_F_DEAD; 2031 dead++; 2032 } 2033 2034 if (nh->nh_labels && nla_put_labels(skb, RTA_NEWDST, 2035 nh->nh_labels, 2036 nh->nh_label)) 2037 goto nla_put_failure; 2038 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC && 2039 nla_put_via(skb, nh->nh_via_table, 2040 mpls_nh_via(rt, nh), 2041 nh->nh_via_alen)) 2042 goto nla_put_failure; 2043 2044 /* length of rtnetlink header + attributes */ 2045 rtnh->rtnh_len = nlmsg_get_pos(skb) - (void *)rtnh; 2046 } endfor_nexthops(rt); 2047 2048 if (linkdown == rt->rt_nhn) 2049 rtm->rtm_flags |= RTNH_F_LINKDOWN; 2050 if (dead == rt->rt_nhn) 2051 rtm->rtm_flags |= RTNH_F_DEAD; 2052 2053 nla_nest_end(skb, mp); 2054 } 2055 2056 nlmsg_end(skb, nlh); 2057 return 0; 2058 2059 nla_put_failure: 2060 nlmsg_cancel(skb, nlh); 2061 return -EMSGSIZE; 2062 } 2063 2064 #if IS_ENABLED(CONFIG_INET) 2065 static int mpls_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh, 2066 struct fib_dump_filter *filter, 2067 struct netlink_callback *cb) 2068 { 2069 return ip_valid_fib_dump_req(net, nlh, filter, cb); 2070 } 2071 #else 2072 static int mpls_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh, 2073 struct fib_dump_filter *filter, 2074 struct netlink_callback *cb) 2075 { 2076 struct netlink_ext_ack *extack = cb->extack; 2077 struct nlattr *tb[RTA_MAX + 1]; 2078 struct rtmsg *rtm; 2079 int err, i; 2080 2081 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) { 2082 NL_SET_ERR_MSG_MOD(extack, "Invalid header for FIB dump request"); 2083 return -EINVAL; 2084 } 2085 2086 rtm = nlmsg_data(nlh); 2087 if (rtm->rtm_dst_len || rtm->rtm_src_len || rtm->rtm_tos || 2088 rtm->rtm_table || rtm->rtm_scope || rtm->rtm_type || 2089 rtm->rtm_flags) { 2090 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for FIB dump request"); 2091 return -EINVAL; 2092 } 2093 2094 if (rtm->rtm_protocol) { 2095 filter->protocol = rtm->rtm_protocol; 2096 filter->filter_set = 1; 2097 cb->answer_flags = NLM_F_DUMP_FILTERED; 2098 } 2099 2100 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX, 2101 rtm_mpls_policy, extack); 2102 if (err < 0) 2103 return err; 2104 2105 for (i = 0; i <= RTA_MAX; ++i) { 2106 int ifindex; 2107 2108 if (i == RTA_OIF) { 2109 ifindex = nla_get_u32(tb[i]); 2110 filter->dev = __dev_get_by_index(net, ifindex); 2111 if (!filter->dev) 2112 return -ENODEV; 2113 filter->filter_set = 1; 2114 } else if (tb[i]) { 2115 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request"); 2116 return -EINVAL; 2117 } 2118 } 2119 2120 return 0; 2121 } 2122 #endif 2123 2124 static bool mpls_rt_uses_dev(struct mpls_route *rt, 2125 const struct net_device *dev) 2126 { 2127 struct net_device *nh_dev; 2128 2129 if (rt->rt_nhn == 1) { 2130 struct mpls_nh *nh = rt->rt_nh; 2131 2132 nh_dev = rtnl_dereference(nh->nh_dev); 2133 if (dev == nh_dev) 2134 return true; 2135 } else { 2136 for_nexthops(rt) { 2137 nh_dev = rtnl_dereference(nh->nh_dev); 2138 if (nh_dev == dev) 2139 return true; 2140 } endfor_nexthops(rt); 2141 } 2142 2143 return false; 2144 } 2145 2146 static int mpls_dump_routes(struct sk_buff *skb, struct netlink_callback *cb) 2147 { 2148 const struct nlmsghdr *nlh = cb->nlh; 2149 struct net *net = sock_net(skb->sk); 2150 struct mpls_route __rcu **platform_label; 2151 struct fib_dump_filter filter = {}; 2152 unsigned int flags = NLM_F_MULTI; 2153 size_t platform_labels; 2154 unsigned int index; 2155 2156 ASSERT_RTNL(); 2157 2158 if (cb->strict_check) { 2159 int err; 2160 2161 err = mpls_valid_fib_dump_req(net, nlh, &filter, cb); 2162 if (err < 0) 2163 return err; 2164 2165 /* for MPLS, there is only 1 table with fixed type and flags. 2166 * If either are set in the filter then return nothing. 2167 */ 2168 if ((filter.table_id && filter.table_id != RT_TABLE_MAIN) || 2169 (filter.rt_type && filter.rt_type != RTN_UNICAST) || 2170 filter.flags) 2171 return skb->len; 2172 } 2173 2174 index = cb->args[0]; 2175 if (index < MPLS_LABEL_FIRST_UNRESERVED) 2176 index = MPLS_LABEL_FIRST_UNRESERVED; 2177 2178 platform_label = rtnl_dereference(net->mpls.platform_label); 2179 platform_labels = net->mpls.platform_labels; 2180 2181 if (filter.filter_set) 2182 flags |= NLM_F_DUMP_FILTERED; 2183 2184 for (; index < platform_labels; index++) { 2185 struct mpls_route *rt; 2186 2187 rt = rtnl_dereference(platform_label[index]); 2188 if (!rt) 2189 continue; 2190 2191 if ((filter.dev && !mpls_rt_uses_dev(rt, filter.dev)) || 2192 (filter.protocol && rt->rt_protocol != filter.protocol)) 2193 continue; 2194 2195 if (mpls_dump_route(skb, NETLINK_CB(cb->skb).portid, 2196 cb->nlh->nlmsg_seq, RTM_NEWROUTE, 2197 index, rt, flags) < 0) 2198 break; 2199 } 2200 cb->args[0] = index; 2201 2202 return skb->len; 2203 } 2204 2205 static inline size_t lfib_nlmsg_size(struct mpls_route *rt) 2206 { 2207 size_t payload = 2208 NLMSG_ALIGN(sizeof(struct rtmsg)) 2209 + nla_total_size(4) /* RTA_DST */ 2210 + nla_total_size(1); /* RTA_TTL_PROPAGATE */ 2211 2212 if (rt->rt_nhn == 1) { 2213 struct mpls_nh *nh = rt->rt_nh; 2214 2215 if (nh->nh_dev) 2216 payload += nla_total_size(4); /* RTA_OIF */ 2217 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC) /* RTA_VIA */ 2218 payload += nla_total_size(2 + nh->nh_via_alen); 2219 if (nh->nh_labels) /* RTA_NEWDST */ 2220 payload += nla_total_size(nh->nh_labels * 4); 2221 } else { 2222 /* each nexthop is packed in an attribute */ 2223 size_t nhsize = 0; 2224 2225 for_nexthops(rt) { 2226 if (!rtnl_dereference(nh->nh_dev)) 2227 continue; 2228 nhsize += nla_total_size(sizeof(struct rtnexthop)); 2229 /* RTA_VIA */ 2230 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC) 2231 nhsize += nla_total_size(2 + nh->nh_via_alen); 2232 if (nh->nh_labels) 2233 nhsize += nla_total_size(nh->nh_labels * 4); 2234 } endfor_nexthops(rt); 2235 /* nested attribute */ 2236 payload += nla_total_size(nhsize); 2237 } 2238 2239 return payload; 2240 } 2241 2242 static void rtmsg_lfib(int event, u32 label, struct mpls_route *rt, 2243 struct nlmsghdr *nlh, struct net *net, u32 portid, 2244 unsigned int nlm_flags) 2245 { 2246 struct sk_buff *skb; 2247 u32 seq = nlh ? nlh->nlmsg_seq : 0; 2248 int err = -ENOBUFS; 2249 2250 skb = nlmsg_new(lfib_nlmsg_size(rt), GFP_KERNEL); 2251 if (skb == NULL) 2252 goto errout; 2253 2254 err = mpls_dump_route(skb, portid, seq, event, label, rt, nlm_flags); 2255 if (err < 0) { 2256 /* -EMSGSIZE implies BUG in lfib_nlmsg_size */ 2257 WARN_ON(err == -EMSGSIZE); 2258 kfree_skb(skb); 2259 goto errout; 2260 } 2261 rtnl_notify(skb, net, portid, RTNLGRP_MPLS_ROUTE, nlh, GFP_KERNEL); 2262 2263 return; 2264 errout: 2265 if (err < 0) 2266 rtnl_set_sk_err(net, RTNLGRP_MPLS_ROUTE, err); 2267 } 2268 2269 static int mpls_valid_getroute_req(struct sk_buff *skb, 2270 const struct nlmsghdr *nlh, 2271 struct nlattr **tb, 2272 struct netlink_ext_ack *extack) 2273 { 2274 struct rtmsg *rtm; 2275 int i, err; 2276 2277 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) { 2278 NL_SET_ERR_MSG_MOD(extack, 2279 "Invalid header for get route request"); 2280 return -EINVAL; 2281 } 2282 2283 if (!netlink_strict_get_check(skb)) 2284 return nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX, 2285 rtm_mpls_policy, extack); 2286 2287 rtm = nlmsg_data(nlh); 2288 if ((rtm->rtm_dst_len && rtm->rtm_dst_len != 20) || 2289 rtm->rtm_src_len || rtm->rtm_tos || rtm->rtm_table || 2290 rtm->rtm_protocol || rtm->rtm_scope || rtm->rtm_type) { 2291 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get route request"); 2292 return -EINVAL; 2293 } 2294 if (rtm->rtm_flags & ~RTM_F_FIB_MATCH) { 2295 NL_SET_ERR_MSG_MOD(extack, 2296 "Invalid flags for get route request"); 2297 return -EINVAL; 2298 } 2299 2300 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX, 2301 rtm_mpls_policy, extack); 2302 if (err) 2303 return err; 2304 2305 if ((tb[RTA_DST] || tb[RTA_NEWDST]) && !rtm->rtm_dst_len) { 2306 NL_SET_ERR_MSG_MOD(extack, "rtm_dst_len must be 20 for MPLS"); 2307 return -EINVAL; 2308 } 2309 2310 for (i = 0; i <= RTA_MAX; i++) { 2311 if (!tb[i]) 2312 continue; 2313 2314 switch (i) { 2315 case RTA_DST: 2316 case RTA_NEWDST: 2317 break; 2318 default: 2319 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get route request"); 2320 return -EINVAL; 2321 } 2322 } 2323 2324 return 0; 2325 } 2326 2327 static int mpls_getroute(struct sk_buff *in_skb, struct nlmsghdr *in_nlh, 2328 struct netlink_ext_ack *extack) 2329 { 2330 struct net *net = sock_net(in_skb->sk); 2331 u32 portid = NETLINK_CB(in_skb).portid; 2332 u32 in_label = LABEL_NOT_SPECIFIED; 2333 struct nlattr *tb[RTA_MAX + 1]; 2334 u32 labels[MAX_NEW_LABELS]; 2335 struct mpls_shim_hdr *hdr; 2336 unsigned int hdr_size = 0; 2337 struct net_device *dev; 2338 struct mpls_route *rt; 2339 struct rtmsg *rtm, *r; 2340 struct nlmsghdr *nlh; 2341 struct sk_buff *skb; 2342 struct mpls_nh *nh; 2343 u8 n_labels; 2344 int err; 2345 2346 err = mpls_valid_getroute_req(in_skb, in_nlh, tb, extack); 2347 if (err < 0) 2348 goto errout; 2349 2350 rtm = nlmsg_data(in_nlh); 2351 2352 if (tb[RTA_DST]) { 2353 u8 label_count; 2354 2355 if (nla_get_labels(tb[RTA_DST], 1, &label_count, 2356 &in_label, extack)) { 2357 err = -EINVAL; 2358 goto errout; 2359 } 2360 2361 if (!mpls_label_ok(net, &in_label, extack)) { 2362 err = -EINVAL; 2363 goto errout; 2364 } 2365 } 2366 2367 rt = mpls_route_input_rcu(net, in_label); 2368 if (!rt) { 2369 err = -ENETUNREACH; 2370 goto errout; 2371 } 2372 2373 if (rtm->rtm_flags & RTM_F_FIB_MATCH) { 2374 skb = nlmsg_new(lfib_nlmsg_size(rt), GFP_KERNEL); 2375 if (!skb) { 2376 err = -ENOBUFS; 2377 goto errout; 2378 } 2379 2380 err = mpls_dump_route(skb, portid, in_nlh->nlmsg_seq, 2381 RTM_NEWROUTE, in_label, rt, 0); 2382 if (err < 0) { 2383 /* -EMSGSIZE implies BUG in lfib_nlmsg_size */ 2384 WARN_ON(err == -EMSGSIZE); 2385 goto errout_free; 2386 } 2387 2388 return rtnl_unicast(skb, net, portid); 2389 } 2390 2391 if (tb[RTA_NEWDST]) { 2392 if (nla_get_labels(tb[RTA_NEWDST], MAX_NEW_LABELS, &n_labels, 2393 labels, extack) != 0) { 2394 err = -EINVAL; 2395 goto errout; 2396 } 2397 2398 hdr_size = n_labels * sizeof(struct mpls_shim_hdr); 2399 } 2400 2401 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); 2402 if (!skb) { 2403 err = -ENOBUFS; 2404 goto errout; 2405 } 2406 2407 skb->protocol = htons(ETH_P_MPLS_UC); 2408 2409 if (hdr_size) { 2410 bool bos; 2411 int i; 2412 2413 if (skb_cow(skb, hdr_size)) { 2414 err = -ENOBUFS; 2415 goto errout_free; 2416 } 2417 2418 skb_reserve(skb, hdr_size); 2419 skb_push(skb, hdr_size); 2420 skb_reset_network_header(skb); 2421 2422 /* Push new labels */ 2423 hdr = mpls_hdr(skb); 2424 bos = true; 2425 for (i = n_labels - 1; i >= 0; i--) { 2426 hdr[i] = mpls_entry_encode(labels[i], 2427 1, 0, bos); 2428 bos = false; 2429 } 2430 } 2431 2432 nh = mpls_select_multipath(rt, skb); 2433 if (!nh) { 2434 err = -ENETUNREACH; 2435 goto errout_free; 2436 } 2437 2438 if (hdr_size) { 2439 skb_pull(skb, hdr_size); 2440 skb_reset_network_header(skb); 2441 } 2442 2443 nlh = nlmsg_put(skb, portid, in_nlh->nlmsg_seq, 2444 RTM_NEWROUTE, sizeof(*r), 0); 2445 if (!nlh) { 2446 err = -EMSGSIZE; 2447 goto errout_free; 2448 } 2449 2450 r = nlmsg_data(nlh); 2451 r->rtm_family = AF_MPLS; 2452 r->rtm_dst_len = 20; 2453 r->rtm_src_len = 0; 2454 r->rtm_table = RT_TABLE_MAIN; 2455 r->rtm_type = RTN_UNICAST; 2456 r->rtm_scope = RT_SCOPE_UNIVERSE; 2457 r->rtm_protocol = rt->rt_protocol; 2458 r->rtm_flags = 0; 2459 2460 if (nla_put_labels(skb, RTA_DST, 1, &in_label)) 2461 goto nla_put_failure; 2462 2463 if (nh->nh_labels && 2464 nla_put_labels(skb, RTA_NEWDST, nh->nh_labels, 2465 nh->nh_label)) 2466 goto nla_put_failure; 2467 2468 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC && 2469 nla_put_via(skb, nh->nh_via_table, mpls_nh_via(rt, nh), 2470 nh->nh_via_alen)) 2471 goto nla_put_failure; 2472 dev = rtnl_dereference(nh->nh_dev); 2473 if (dev && nla_put_u32(skb, RTA_OIF, dev->ifindex)) 2474 goto nla_put_failure; 2475 2476 nlmsg_end(skb, nlh); 2477 2478 err = rtnl_unicast(skb, net, portid); 2479 errout: 2480 return err; 2481 2482 nla_put_failure: 2483 nlmsg_cancel(skb, nlh); 2484 err = -EMSGSIZE; 2485 errout_free: 2486 kfree_skb(skb); 2487 return err; 2488 } 2489 2490 static int resize_platform_label_table(struct net *net, size_t limit) 2491 { 2492 size_t size = sizeof(struct mpls_route *) * limit; 2493 size_t old_limit; 2494 size_t cp_size; 2495 struct mpls_route __rcu **labels = NULL, **old; 2496 struct mpls_route *rt0 = NULL, *rt2 = NULL; 2497 unsigned index; 2498 2499 if (size) { 2500 labels = kvzalloc(size, GFP_KERNEL); 2501 if (!labels) 2502 goto nolabels; 2503 } 2504 2505 /* In case the predefined labels need to be populated */ 2506 if (limit > MPLS_LABEL_IPV4NULL) { 2507 struct net_device *lo = net->loopback_dev; 2508 rt0 = mpls_rt_alloc(1, lo->addr_len, 0); 2509 if (IS_ERR(rt0)) 2510 goto nort0; 2511 RCU_INIT_POINTER(rt0->rt_nh->nh_dev, lo); 2512 rt0->rt_protocol = RTPROT_KERNEL; 2513 rt0->rt_payload_type = MPT_IPV4; 2514 rt0->rt_ttl_propagate = MPLS_TTL_PROP_DEFAULT; 2515 rt0->rt_nh->nh_via_table = NEIGH_LINK_TABLE; 2516 rt0->rt_nh->nh_via_alen = lo->addr_len; 2517 memcpy(__mpls_nh_via(rt0, rt0->rt_nh), lo->dev_addr, 2518 lo->addr_len); 2519 } 2520 if (limit > MPLS_LABEL_IPV6NULL) { 2521 struct net_device *lo = net->loopback_dev; 2522 rt2 = mpls_rt_alloc(1, lo->addr_len, 0); 2523 if (IS_ERR(rt2)) 2524 goto nort2; 2525 RCU_INIT_POINTER(rt2->rt_nh->nh_dev, lo); 2526 rt2->rt_protocol = RTPROT_KERNEL; 2527 rt2->rt_payload_type = MPT_IPV6; 2528 rt2->rt_ttl_propagate = MPLS_TTL_PROP_DEFAULT; 2529 rt2->rt_nh->nh_via_table = NEIGH_LINK_TABLE; 2530 rt2->rt_nh->nh_via_alen = lo->addr_len; 2531 memcpy(__mpls_nh_via(rt2, rt2->rt_nh), lo->dev_addr, 2532 lo->addr_len); 2533 } 2534 2535 rtnl_lock(); 2536 /* Remember the original table */ 2537 old = rtnl_dereference(net->mpls.platform_label); 2538 old_limit = net->mpls.platform_labels; 2539 2540 /* Free any labels beyond the new table */ 2541 for (index = limit; index < old_limit; index++) 2542 mpls_route_update(net, index, NULL, NULL); 2543 2544 /* Copy over the old labels */ 2545 cp_size = size; 2546 if (old_limit < limit) 2547 cp_size = old_limit * sizeof(struct mpls_route *); 2548 2549 memcpy(labels, old, cp_size); 2550 2551 /* If needed set the predefined labels */ 2552 if ((old_limit <= MPLS_LABEL_IPV6NULL) && 2553 (limit > MPLS_LABEL_IPV6NULL)) { 2554 RCU_INIT_POINTER(labels[MPLS_LABEL_IPV6NULL], rt2); 2555 rt2 = NULL; 2556 } 2557 2558 if ((old_limit <= MPLS_LABEL_IPV4NULL) && 2559 (limit > MPLS_LABEL_IPV4NULL)) { 2560 RCU_INIT_POINTER(labels[MPLS_LABEL_IPV4NULL], rt0); 2561 rt0 = NULL; 2562 } 2563 2564 /* Update the global pointers */ 2565 net->mpls.platform_labels = limit; 2566 rcu_assign_pointer(net->mpls.platform_label, labels); 2567 2568 rtnl_unlock(); 2569 2570 mpls_rt_free(rt2); 2571 mpls_rt_free(rt0); 2572 2573 if (old) { 2574 synchronize_rcu(); 2575 kvfree(old); 2576 } 2577 return 0; 2578 2579 nort2: 2580 mpls_rt_free(rt0); 2581 nort0: 2582 kvfree(labels); 2583 nolabels: 2584 return -ENOMEM; 2585 } 2586 2587 static int mpls_platform_labels(struct ctl_table *table, int write, 2588 void *buffer, size_t *lenp, loff_t *ppos) 2589 { 2590 struct net *net = table->data; 2591 int platform_labels = net->mpls.platform_labels; 2592 int ret; 2593 struct ctl_table tmp = { 2594 .procname = table->procname, 2595 .data = &platform_labels, 2596 .maxlen = sizeof(int), 2597 .mode = table->mode, 2598 .extra1 = SYSCTL_ZERO, 2599 .extra2 = &label_limit, 2600 }; 2601 2602 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); 2603 2604 if (write && ret == 0) 2605 ret = resize_platform_label_table(net, platform_labels); 2606 2607 return ret; 2608 } 2609 2610 #define MPLS_NS_SYSCTL_OFFSET(field) \ 2611 (&((struct net *)0)->field) 2612 2613 static const struct ctl_table mpls_table[] = { 2614 { 2615 .procname = "platform_labels", 2616 .data = NULL, 2617 .maxlen = sizeof(int), 2618 .mode = 0644, 2619 .proc_handler = mpls_platform_labels, 2620 }, 2621 { 2622 .procname = "ip_ttl_propagate", 2623 .data = MPLS_NS_SYSCTL_OFFSET(mpls.ip_ttl_propagate), 2624 .maxlen = sizeof(int), 2625 .mode = 0644, 2626 .proc_handler = proc_dointvec_minmax, 2627 .extra1 = SYSCTL_ZERO, 2628 .extra2 = SYSCTL_ONE, 2629 }, 2630 { 2631 .procname = "default_ttl", 2632 .data = MPLS_NS_SYSCTL_OFFSET(mpls.default_ttl), 2633 .maxlen = sizeof(int), 2634 .mode = 0644, 2635 .proc_handler = proc_dointvec_minmax, 2636 .extra1 = SYSCTL_ONE, 2637 .extra2 = &ttl_max, 2638 }, 2639 { } 2640 }; 2641 2642 static int mpls_net_init(struct net *net) 2643 { 2644 struct ctl_table *table; 2645 int i; 2646 2647 net->mpls.platform_labels = 0; 2648 net->mpls.platform_label = NULL; 2649 net->mpls.ip_ttl_propagate = 1; 2650 net->mpls.default_ttl = 255; 2651 2652 table = kmemdup(mpls_table, sizeof(mpls_table), GFP_KERNEL); 2653 if (table == NULL) 2654 return -ENOMEM; 2655 2656 /* Table data contains only offsets relative to the base of 2657 * the mdev at this point, so make them absolute. 2658 */ 2659 for (i = 0; i < ARRAY_SIZE(mpls_table) - 1; i++) 2660 table[i].data = (char *)net + (uintptr_t)table[i].data; 2661 2662 net->mpls.ctl = register_net_sysctl(net, "net/mpls", table); 2663 if (net->mpls.ctl == NULL) { 2664 kfree(table); 2665 return -ENOMEM; 2666 } 2667 2668 return 0; 2669 } 2670 2671 static void mpls_net_exit(struct net *net) 2672 { 2673 struct mpls_route __rcu **platform_label; 2674 size_t platform_labels; 2675 struct ctl_table *table; 2676 unsigned int index; 2677 2678 table = net->mpls.ctl->ctl_table_arg; 2679 unregister_net_sysctl_table(net->mpls.ctl); 2680 kfree(table); 2681 2682 /* An rcu grace period has passed since there was a device in 2683 * the network namespace (and thus the last in flight packet) 2684 * left this network namespace. This is because 2685 * unregister_netdevice_many and netdev_run_todo has completed 2686 * for each network device that was in this network namespace. 2687 * 2688 * As such no additional rcu synchronization is necessary when 2689 * freeing the platform_label table. 2690 */ 2691 rtnl_lock(); 2692 platform_label = rtnl_dereference(net->mpls.platform_label); 2693 platform_labels = net->mpls.platform_labels; 2694 for (index = 0; index < platform_labels; index++) { 2695 struct mpls_route *rt = rtnl_dereference(platform_label[index]); 2696 RCU_INIT_POINTER(platform_label[index], NULL); 2697 mpls_notify_route(net, index, rt, NULL, NULL); 2698 mpls_rt_free(rt); 2699 } 2700 rtnl_unlock(); 2701 2702 kvfree(platform_label); 2703 } 2704 2705 static struct pernet_operations mpls_net_ops = { 2706 .init = mpls_net_init, 2707 .exit = mpls_net_exit, 2708 }; 2709 2710 static struct rtnl_af_ops mpls_af_ops __read_mostly = { 2711 .family = AF_MPLS, 2712 .fill_stats_af = mpls_fill_stats_af, 2713 .get_stats_af_size = mpls_get_stats_af_size, 2714 }; 2715 2716 static int __init mpls_init(void) 2717 { 2718 int err; 2719 2720 BUILD_BUG_ON(sizeof(struct mpls_shim_hdr) != 4); 2721 2722 err = register_pernet_subsys(&mpls_net_ops); 2723 if (err) 2724 goto out; 2725 2726 err = register_netdevice_notifier(&mpls_dev_notifier); 2727 if (err) 2728 goto out_unregister_pernet; 2729 2730 dev_add_pack(&mpls_packet_type); 2731 2732 rtnl_af_register(&mpls_af_ops); 2733 2734 rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_NEWROUTE, 2735 mpls_rtm_newroute, NULL, 0); 2736 rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_DELROUTE, 2737 mpls_rtm_delroute, NULL, 0); 2738 rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_GETROUTE, 2739 mpls_getroute, mpls_dump_routes, 0); 2740 rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_GETNETCONF, 2741 mpls_netconf_get_devconf, 2742 mpls_netconf_dump_devconf, 0); 2743 err = ipgre_tunnel_encap_add_mpls_ops(); 2744 if (err) 2745 pr_err("Can't add mpls over gre tunnel ops\n"); 2746 2747 err = 0; 2748 out: 2749 return err; 2750 2751 out_unregister_pernet: 2752 unregister_pernet_subsys(&mpls_net_ops); 2753 goto out; 2754 } 2755 module_init(mpls_init); 2756 2757 static void __exit mpls_exit(void) 2758 { 2759 rtnl_unregister_all(PF_MPLS); 2760 rtnl_af_unregister(&mpls_af_ops); 2761 dev_remove_pack(&mpls_packet_type); 2762 unregister_netdevice_notifier(&mpls_dev_notifier); 2763 unregister_pernet_subsys(&mpls_net_ops); 2764 ipgre_tunnel_encap_del_mpls_ops(); 2765 } 2766 module_exit(mpls_exit); 2767 2768 MODULE_DESCRIPTION("MultiProtocol Label Switching"); 2769 MODULE_LICENSE("GPL v2"); 2770 MODULE_ALIAS_NETPROTO(PF_MPLS); 2771