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 const 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 const struct mpls_nh *nh; 347 struct mpls_route *rt; 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; 410 411 /* Find the output device */ 412 out_dev = nh->nh_dev; 413 if (!mpls_output_possible(out_dev)) 414 goto tx_err; 415 416 /* Verify the destination can hold the packet */ 417 new_header_size = mpls_nh_header_size(nh); 418 mtu = mpls_dev_mtu(out_dev); 419 if (mpls_pkt_too_big(skb, mtu - new_header_size)) 420 goto tx_err; 421 422 hh_len = LL_RESERVED_SPACE(out_dev); 423 if (!out_dev->header_ops) 424 hh_len = 0; 425 426 /* Ensure there is enough space for the headers in the skb */ 427 if (skb_cow(skb, hh_len + new_header_size)) 428 goto tx_err; 429 430 skb->dev = out_dev; 431 skb->protocol = htons(ETH_P_MPLS_UC); 432 433 dec.ttl -= 1; 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 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 rt = mpls_rt_alloc(nhs, max_via_alen, max_labels); 1023 if (IS_ERR(rt)) { 1024 err = PTR_ERR(rt); 1025 goto errout; 1026 } 1027 1028 rt->rt_protocol = cfg->rc_protocol; 1029 rt->rt_payload_type = cfg->rc_payload_type; 1030 rt->rt_ttl_propagate = cfg->rc_ttl_propagate; 1031 1032 if (cfg->rc_mp) 1033 err = mpls_nh_build_multi(cfg, rt, max_labels, extack); 1034 else 1035 err = mpls_nh_build_from_cfg(cfg, rt); 1036 if (err) 1037 goto freert; 1038 1039 mpls_route_update(net, index, rt, &cfg->rc_nlinfo); 1040 1041 return 0; 1042 1043 freert: 1044 mpls_rt_free(rt); 1045 errout: 1046 return err; 1047 } 1048 1049 static int mpls_route_del(struct mpls_route_config *cfg, 1050 struct netlink_ext_ack *extack) 1051 { 1052 struct net *net = cfg->rc_nlinfo.nl_net; 1053 unsigned index; 1054 int err = -EINVAL; 1055 1056 index = cfg->rc_label; 1057 1058 if (!mpls_label_ok(net, &index, extack)) 1059 goto errout; 1060 1061 mpls_route_update(net, index, NULL, &cfg->rc_nlinfo); 1062 1063 err = 0; 1064 errout: 1065 return err; 1066 } 1067 1068 static void mpls_get_stats(struct mpls_dev *mdev, 1069 struct mpls_link_stats *stats) 1070 { 1071 struct mpls_pcpu_stats *p; 1072 int i; 1073 1074 memset(stats, 0, sizeof(*stats)); 1075 1076 for_each_possible_cpu(i) { 1077 struct mpls_link_stats local; 1078 unsigned int start; 1079 1080 p = per_cpu_ptr(mdev->stats, i); 1081 do { 1082 start = u64_stats_fetch_begin(&p->syncp); 1083 local = p->stats; 1084 } while (u64_stats_fetch_retry(&p->syncp, start)); 1085 1086 stats->rx_packets += local.rx_packets; 1087 stats->rx_bytes += local.rx_bytes; 1088 stats->tx_packets += local.tx_packets; 1089 stats->tx_bytes += local.tx_bytes; 1090 stats->rx_errors += local.rx_errors; 1091 stats->tx_errors += local.tx_errors; 1092 stats->rx_dropped += local.rx_dropped; 1093 stats->tx_dropped += local.tx_dropped; 1094 stats->rx_noroute += local.rx_noroute; 1095 } 1096 } 1097 1098 static int mpls_fill_stats_af(struct sk_buff *skb, 1099 const struct net_device *dev) 1100 { 1101 struct mpls_link_stats *stats; 1102 struct mpls_dev *mdev; 1103 struct nlattr *nla; 1104 1105 mdev = mpls_dev_get(dev); 1106 if (!mdev) 1107 return -ENODATA; 1108 1109 nla = nla_reserve_64bit(skb, MPLS_STATS_LINK, 1110 sizeof(struct mpls_link_stats), 1111 MPLS_STATS_UNSPEC); 1112 if (!nla) 1113 return -EMSGSIZE; 1114 1115 stats = nla_data(nla); 1116 mpls_get_stats(mdev, stats); 1117 1118 return 0; 1119 } 1120 1121 static size_t mpls_get_stats_af_size(const struct net_device *dev) 1122 { 1123 struct mpls_dev *mdev; 1124 1125 mdev = mpls_dev_get(dev); 1126 if (!mdev) 1127 return 0; 1128 1129 return nla_total_size_64bit(sizeof(struct mpls_link_stats)); 1130 } 1131 1132 static int mpls_netconf_fill_devconf(struct sk_buff *skb, struct mpls_dev *mdev, 1133 u32 portid, u32 seq, int event, 1134 unsigned int flags, int type) 1135 { 1136 struct nlmsghdr *nlh; 1137 struct netconfmsg *ncm; 1138 bool all = false; 1139 1140 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 1141 flags); 1142 if (!nlh) 1143 return -EMSGSIZE; 1144 1145 if (type == NETCONFA_ALL) 1146 all = true; 1147 1148 ncm = nlmsg_data(nlh); 1149 ncm->ncm_family = AF_MPLS; 1150 1151 if (nla_put_s32(skb, NETCONFA_IFINDEX, mdev->dev->ifindex) < 0) 1152 goto nla_put_failure; 1153 1154 if ((all || type == NETCONFA_INPUT) && 1155 nla_put_s32(skb, NETCONFA_INPUT, 1156 mdev->input_enabled) < 0) 1157 goto nla_put_failure; 1158 1159 nlmsg_end(skb, nlh); 1160 return 0; 1161 1162 nla_put_failure: 1163 nlmsg_cancel(skb, nlh); 1164 return -EMSGSIZE; 1165 } 1166 1167 static int mpls_netconf_msgsize_devconf(int type) 1168 { 1169 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 1170 + nla_total_size(4); /* NETCONFA_IFINDEX */ 1171 bool all = false; 1172 1173 if (type == NETCONFA_ALL) 1174 all = true; 1175 1176 if (all || type == NETCONFA_INPUT) 1177 size += nla_total_size(4); 1178 1179 return size; 1180 } 1181 1182 static void mpls_netconf_notify_devconf(struct net *net, int event, 1183 int type, struct mpls_dev *mdev) 1184 { 1185 struct sk_buff *skb; 1186 int err = -ENOBUFS; 1187 1188 skb = nlmsg_new(mpls_netconf_msgsize_devconf(type), GFP_KERNEL); 1189 if (!skb) 1190 goto errout; 1191 1192 err = mpls_netconf_fill_devconf(skb, mdev, 0, 0, event, 0, type); 1193 if (err < 0) { 1194 /* -EMSGSIZE implies BUG in mpls_netconf_msgsize_devconf() */ 1195 WARN_ON(err == -EMSGSIZE); 1196 kfree_skb(skb); 1197 goto errout; 1198 } 1199 1200 rtnl_notify(skb, net, 0, RTNLGRP_MPLS_NETCONF, NULL, GFP_KERNEL); 1201 return; 1202 errout: 1203 if (err < 0) 1204 rtnl_set_sk_err(net, RTNLGRP_MPLS_NETCONF, err); 1205 } 1206 1207 static const struct nla_policy devconf_mpls_policy[NETCONFA_MAX + 1] = { 1208 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 1209 }; 1210 1211 static int mpls_netconf_valid_get_req(struct sk_buff *skb, 1212 const struct nlmsghdr *nlh, 1213 struct nlattr **tb, 1214 struct netlink_ext_ack *extack) 1215 { 1216 int i, err; 1217 1218 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) { 1219 NL_SET_ERR_MSG_MOD(extack, 1220 "Invalid header for netconf get request"); 1221 return -EINVAL; 1222 } 1223 1224 if (!netlink_strict_get_check(skb)) 1225 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg), 1226 tb, NETCONFA_MAX, 1227 devconf_mpls_policy, extack); 1228 1229 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg), 1230 tb, NETCONFA_MAX, 1231 devconf_mpls_policy, extack); 1232 if (err) 1233 return err; 1234 1235 for (i = 0; i <= NETCONFA_MAX; i++) { 1236 if (!tb[i]) 1237 continue; 1238 1239 switch (i) { 1240 case NETCONFA_IFINDEX: 1241 break; 1242 default: 1243 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request"); 1244 return -EINVAL; 1245 } 1246 } 1247 1248 return 0; 1249 } 1250 1251 static int mpls_netconf_get_devconf(struct sk_buff *in_skb, 1252 struct nlmsghdr *nlh, 1253 struct netlink_ext_ack *extack) 1254 { 1255 struct net *net = sock_net(in_skb->sk); 1256 struct nlattr *tb[NETCONFA_MAX + 1]; 1257 struct net_device *dev; 1258 struct mpls_dev *mdev; 1259 struct sk_buff *skb; 1260 int ifindex; 1261 int err; 1262 1263 err = mpls_netconf_valid_get_req(in_skb, nlh, tb, extack); 1264 if (err < 0) 1265 goto errout; 1266 1267 err = -EINVAL; 1268 if (!tb[NETCONFA_IFINDEX]) 1269 goto errout; 1270 1271 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 1272 dev = __dev_get_by_index(net, ifindex); 1273 if (!dev) 1274 goto errout; 1275 1276 mdev = mpls_dev_get(dev); 1277 if (!mdev) 1278 goto errout; 1279 1280 err = -ENOBUFS; 1281 skb = nlmsg_new(mpls_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL); 1282 if (!skb) 1283 goto errout; 1284 1285 err = mpls_netconf_fill_devconf(skb, mdev, 1286 NETLINK_CB(in_skb).portid, 1287 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 1288 NETCONFA_ALL); 1289 if (err < 0) { 1290 /* -EMSGSIZE implies BUG in mpls_netconf_msgsize_devconf() */ 1291 WARN_ON(err == -EMSGSIZE); 1292 kfree_skb(skb); 1293 goto errout; 1294 } 1295 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 1296 errout: 1297 return err; 1298 } 1299 1300 static int mpls_netconf_dump_devconf(struct sk_buff *skb, 1301 struct netlink_callback *cb) 1302 { 1303 const struct nlmsghdr *nlh = cb->nlh; 1304 struct net *net = sock_net(skb->sk); 1305 struct hlist_head *head; 1306 struct net_device *dev; 1307 struct mpls_dev *mdev; 1308 int idx, s_idx; 1309 int h, s_h; 1310 1311 if (cb->strict_check) { 1312 struct netlink_ext_ack *extack = cb->extack; 1313 struct netconfmsg *ncm; 1314 1315 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) { 1316 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request"); 1317 return -EINVAL; 1318 } 1319 1320 if (nlmsg_attrlen(nlh, sizeof(*ncm))) { 1321 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request"); 1322 return -EINVAL; 1323 } 1324 } 1325 1326 s_h = cb->args[0]; 1327 s_idx = idx = cb->args[1]; 1328 1329 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 1330 idx = 0; 1331 head = &net->dev_index_head[h]; 1332 rcu_read_lock(); 1333 cb->seq = net->dev_base_seq; 1334 hlist_for_each_entry_rcu(dev, head, index_hlist) { 1335 if (idx < s_idx) 1336 goto cont; 1337 mdev = mpls_dev_get(dev); 1338 if (!mdev) 1339 goto cont; 1340 if (mpls_netconf_fill_devconf(skb, mdev, 1341 NETLINK_CB(cb->skb).portid, 1342 nlh->nlmsg_seq, 1343 RTM_NEWNETCONF, 1344 NLM_F_MULTI, 1345 NETCONFA_ALL) < 0) { 1346 rcu_read_unlock(); 1347 goto done; 1348 } 1349 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 1350 cont: 1351 idx++; 1352 } 1353 rcu_read_unlock(); 1354 } 1355 done: 1356 cb->args[0] = h; 1357 cb->args[1] = idx; 1358 1359 return skb->len; 1360 } 1361 1362 #define MPLS_PERDEV_SYSCTL_OFFSET(field) \ 1363 (&((struct mpls_dev *)0)->field) 1364 1365 static int mpls_conf_proc(struct ctl_table *ctl, int write, 1366 void *buffer, size_t *lenp, loff_t *ppos) 1367 { 1368 int oval = *(int *)ctl->data; 1369 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 1370 1371 if (write) { 1372 struct mpls_dev *mdev = ctl->extra1; 1373 int i = (int *)ctl->data - (int *)mdev; 1374 struct net *net = ctl->extra2; 1375 int val = *(int *)ctl->data; 1376 1377 if (i == offsetof(struct mpls_dev, input_enabled) && 1378 val != oval) { 1379 mpls_netconf_notify_devconf(net, RTM_NEWNETCONF, 1380 NETCONFA_INPUT, mdev); 1381 } 1382 } 1383 1384 return ret; 1385 } 1386 1387 static const struct ctl_table mpls_dev_table[] = { 1388 { 1389 .procname = "input", 1390 .maxlen = sizeof(int), 1391 .mode = 0644, 1392 .proc_handler = mpls_conf_proc, 1393 .data = MPLS_PERDEV_SYSCTL_OFFSET(input_enabled), 1394 }, 1395 { } 1396 }; 1397 1398 static int mpls_dev_sysctl_register(struct net_device *dev, 1399 struct mpls_dev *mdev) 1400 { 1401 char path[sizeof("net/mpls/conf/") + IFNAMSIZ]; 1402 struct net *net = dev_net(dev); 1403 struct ctl_table *table; 1404 int i; 1405 1406 table = kmemdup(&mpls_dev_table, sizeof(mpls_dev_table), GFP_KERNEL); 1407 if (!table) 1408 goto out; 1409 1410 /* Table data contains only offsets relative to the base of 1411 * the mdev at this point, so make them absolute. 1412 */ 1413 for (i = 0; i < ARRAY_SIZE(mpls_dev_table); i++) { 1414 table[i].data = (char *)mdev + (uintptr_t)table[i].data; 1415 table[i].extra1 = mdev; 1416 table[i].extra2 = net; 1417 } 1418 1419 snprintf(path, sizeof(path), "net/mpls/conf/%s", dev->name); 1420 1421 mdev->sysctl = register_net_sysctl(net, path, table); 1422 if (!mdev->sysctl) 1423 goto free; 1424 1425 mpls_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, mdev); 1426 return 0; 1427 1428 free: 1429 kfree(table); 1430 out: 1431 mdev->sysctl = NULL; 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 if (!mdev->sysctl) 1442 return; 1443 1444 table = mdev->sysctl->ctl_table_arg; 1445 unregister_net_sysctl_table(mdev->sysctl); 1446 kfree(table); 1447 1448 mpls_netconf_notify_devconf(net, RTM_DELNETCONF, 0, mdev); 1449 } 1450 1451 static struct mpls_dev *mpls_add_dev(struct net_device *dev) 1452 { 1453 struct mpls_dev *mdev; 1454 int err = -ENOMEM; 1455 int i; 1456 1457 ASSERT_RTNL(); 1458 1459 mdev = kzalloc(sizeof(*mdev), GFP_KERNEL); 1460 if (!mdev) 1461 return ERR_PTR(err); 1462 1463 mdev->stats = alloc_percpu(struct mpls_pcpu_stats); 1464 if (!mdev->stats) 1465 goto free; 1466 1467 for_each_possible_cpu(i) { 1468 struct mpls_pcpu_stats *mpls_stats; 1469 1470 mpls_stats = per_cpu_ptr(mdev->stats, i); 1471 u64_stats_init(&mpls_stats->syncp); 1472 } 1473 1474 mdev->dev = dev; 1475 1476 err = mpls_dev_sysctl_register(dev, mdev); 1477 if (err) 1478 goto free; 1479 1480 rcu_assign_pointer(dev->mpls_ptr, mdev); 1481 1482 return mdev; 1483 1484 free: 1485 free_percpu(mdev->stats); 1486 kfree(mdev); 1487 return ERR_PTR(err); 1488 } 1489 1490 static void mpls_dev_destroy_rcu(struct rcu_head *head) 1491 { 1492 struct mpls_dev *mdev = container_of(head, struct mpls_dev, rcu); 1493 1494 free_percpu(mdev->stats); 1495 kfree(mdev); 1496 } 1497 1498 static int mpls_ifdown(struct net_device *dev, int event) 1499 { 1500 struct mpls_route __rcu **platform_label; 1501 struct net *net = dev_net(dev); 1502 unsigned index; 1503 1504 platform_label = rtnl_dereference(net->mpls.platform_label); 1505 for (index = 0; index < net->mpls.platform_labels; index++) { 1506 struct mpls_route *rt = rtnl_dereference(platform_label[index]); 1507 bool nh_del = false; 1508 u8 alive = 0; 1509 1510 if (!rt) 1511 continue; 1512 1513 if (event == NETDEV_UNREGISTER) { 1514 u8 deleted = 0; 1515 1516 for_nexthops(rt) { 1517 if (!nh->nh_dev || nh->nh_dev == dev) 1518 deleted++; 1519 if (nh->nh_dev == dev) 1520 nh_del = true; 1521 } endfor_nexthops(rt); 1522 1523 /* if there are no more nexthops, delete the route */ 1524 if (deleted == rt->rt_nhn) { 1525 mpls_route_update(net, index, NULL, NULL); 1526 continue; 1527 } 1528 1529 if (nh_del) { 1530 size_t size = sizeof(*rt) + rt->rt_nhn * 1531 rt->rt_nh_size; 1532 struct mpls_route *orig = rt; 1533 1534 rt = kmemdup(orig, size, GFP_KERNEL); 1535 if (!rt) 1536 return -ENOMEM; 1537 } 1538 } 1539 1540 change_nexthops(rt) { 1541 unsigned int nh_flags = nh->nh_flags; 1542 1543 if (nh->nh_dev != dev) 1544 goto next; 1545 1546 switch (event) { 1547 case NETDEV_DOWN: 1548 case NETDEV_UNREGISTER: 1549 nh_flags |= RTNH_F_DEAD; 1550 fallthrough; 1551 case NETDEV_CHANGE: 1552 nh_flags |= RTNH_F_LINKDOWN; 1553 break; 1554 } 1555 if (event == NETDEV_UNREGISTER) 1556 nh->nh_dev = NULL; 1557 1558 if (nh->nh_flags != nh_flags) 1559 WRITE_ONCE(nh->nh_flags, nh_flags); 1560 next: 1561 if (!(nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN))) 1562 alive++; 1563 } endfor_nexthops(rt); 1564 1565 WRITE_ONCE(rt->rt_nhn_alive, alive); 1566 1567 if (nh_del) 1568 mpls_route_update(net, index, rt, NULL); 1569 } 1570 1571 return 0; 1572 } 1573 1574 static void mpls_ifup(struct net_device *dev, unsigned int flags) 1575 { 1576 struct mpls_route __rcu **platform_label; 1577 struct net *net = dev_net(dev); 1578 unsigned index; 1579 u8 alive; 1580 1581 platform_label = rtnl_dereference(net->mpls.platform_label); 1582 for (index = 0; index < net->mpls.platform_labels; index++) { 1583 struct mpls_route *rt = rtnl_dereference(platform_label[index]); 1584 1585 if (!rt) 1586 continue; 1587 1588 alive = 0; 1589 change_nexthops(rt) { 1590 unsigned int nh_flags = nh->nh_flags; 1591 1592 if (!(nh_flags & flags)) { 1593 alive++; 1594 continue; 1595 } 1596 if (nh->nh_dev != dev) 1597 continue; 1598 alive++; 1599 nh_flags &= ~flags; 1600 WRITE_ONCE(nh->nh_flags, nh_flags); 1601 } endfor_nexthops(rt); 1602 1603 WRITE_ONCE(rt->rt_nhn_alive, alive); 1604 } 1605 } 1606 1607 static int mpls_dev_notify(struct notifier_block *this, unsigned long event, 1608 void *ptr) 1609 { 1610 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1611 struct mpls_dev *mdev; 1612 unsigned int flags; 1613 int err; 1614 1615 if (event == NETDEV_REGISTER) { 1616 mdev = mpls_add_dev(dev); 1617 if (IS_ERR(mdev)) 1618 return notifier_from_errno(PTR_ERR(mdev)); 1619 1620 return NOTIFY_OK; 1621 } 1622 1623 mdev = mpls_dev_get(dev); 1624 if (!mdev) 1625 return NOTIFY_OK; 1626 1627 switch (event) { 1628 1629 case NETDEV_DOWN: 1630 err = mpls_ifdown(dev, event); 1631 if (err) 1632 return notifier_from_errno(err); 1633 break; 1634 case NETDEV_UP: 1635 flags = dev_get_flags(dev); 1636 if (flags & (IFF_RUNNING | IFF_LOWER_UP)) 1637 mpls_ifup(dev, RTNH_F_DEAD | RTNH_F_LINKDOWN); 1638 else 1639 mpls_ifup(dev, RTNH_F_DEAD); 1640 break; 1641 case NETDEV_CHANGE: 1642 flags = dev_get_flags(dev); 1643 if (flags & (IFF_RUNNING | IFF_LOWER_UP)) { 1644 mpls_ifup(dev, RTNH_F_DEAD | RTNH_F_LINKDOWN); 1645 } else { 1646 err = mpls_ifdown(dev, event); 1647 if (err) 1648 return notifier_from_errno(err); 1649 } 1650 break; 1651 case NETDEV_UNREGISTER: 1652 err = mpls_ifdown(dev, event); 1653 if (err) 1654 return notifier_from_errno(err); 1655 mdev = mpls_dev_get(dev); 1656 if (mdev) { 1657 mpls_dev_sysctl_unregister(dev, mdev); 1658 RCU_INIT_POINTER(dev->mpls_ptr, NULL); 1659 call_rcu(&mdev->rcu, mpls_dev_destroy_rcu); 1660 } 1661 break; 1662 case NETDEV_CHANGENAME: 1663 mdev = mpls_dev_get(dev); 1664 if (mdev) { 1665 mpls_dev_sysctl_unregister(dev, mdev); 1666 err = mpls_dev_sysctl_register(dev, mdev); 1667 if (err) 1668 return notifier_from_errno(err); 1669 } 1670 break; 1671 } 1672 return NOTIFY_OK; 1673 } 1674 1675 static struct notifier_block mpls_dev_notifier = { 1676 .notifier_call = mpls_dev_notify, 1677 }; 1678 1679 static int nla_put_via(struct sk_buff *skb, 1680 u8 table, const void *addr, int alen) 1681 { 1682 static const int table_to_family[NEIGH_NR_TABLES + 1] = { 1683 AF_INET, AF_INET6, AF_DECnet, AF_PACKET, 1684 }; 1685 struct nlattr *nla; 1686 struct rtvia *via; 1687 int family = AF_UNSPEC; 1688 1689 nla = nla_reserve(skb, RTA_VIA, alen + 2); 1690 if (!nla) 1691 return -EMSGSIZE; 1692 1693 if (table <= NEIGH_NR_TABLES) 1694 family = table_to_family[table]; 1695 1696 via = nla_data(nla); 1697 via->rtvia_family = family; 1698 memcpy(via->rtvia_addr, addr, alen); 1699 return 0; 1700 } 1701 1702 int nla_put_labels(struct sk_buff *skb, int attrtype, 1703 u8 labels, const u32 label[]) 1704 { 1705 struct nlattr *nla; 1706 struct mpls_shim_hdr *nla_label; 1707 bool bos; 1708 int i; 1709 nla = nla_reserve(skb, attrtype, labels*4); 1710 if (!nla) 1711 return -EMSGSIZE; 1712 1713 nla_label = nla_data(nla); 1714 bos = true; 1715 for (i = labels - 1; i >= 0; i--) { 1716 nla_label[i] = mpls_entry_encode(label[i], 0, 0, bos); 1717 bos = false; 1718 } 1719 1720 return 0; 1721 } 1722 EXPORT_SYMBOL_GPL(nla_put_labels); 1723 1724 int nla_get_labels(const struct nlattr *nla, u8 max_labels, u8 *labels, 1725 u32 label[], struct netlink_ext_ack *extack) 1726 { 1727 unsigned len = nla_len(nla); 1728 struct mpls_shim_hdr *nla_label; 1729 u8 nla_labels; 1730 bool bos; 1731 int i; 1732 1733 /* len needs to be an even multiple of 4 (the label size). Number 1734 * of labels is a u8 so check for overflow. 1735 */ 1736 if (len & 3 || len / 4 > 255) { 1737 NL_SET_ERR_MSG_ATTR(extack, nla, 1738 "Invalid length for labels attribute"); 1739 return -EINVAL; 1740 } 1741 1742 /* Limit the number of new labels allowed */ 1743 nla_labels = len/4; 1744 if (nla_labels > max_labels) { 1745 NL_SET_ERR_MSG(extack, "Too many labels"); 1746 return -EINVAL; 1747 } 1748 1749 /* when label == NULL, caller wants number of labels */ 1750 if (!label) 1751 goto out; 1752 1753 nla_label = nla_data(nla); 1754 bos = true; 1755 for (i = nla_labels - 1; i >= 0; i--, bos = false) { 1756 struct mpls_entry_decoded dec; 1757 dec = mpls_entry_decode(nla_label + i); 1758 1759 /* Ensure the bottom of stack flag is properly set 1760 * and ttl and tc are both clear. 1761 */ 1762 if (dec.ttl) { 1763 NL_SET_ERR_MSG_ATTR(extack, nla, 1764 "TTL in label must be 0"); 1765 return -EINVAL; 1766 } 1767 1768 if (dec.tc) { 1769 NL_SET_ERR_MSG_ATTR(extack, nla, 1770 "Traffic class in label must be 0"); 1771 return -EINVAL; 1772 } 1773 1774 if (dec.bos != bos) { 1775 NL_SET_BAD_ATTR(extack, nla); 1776 if (bos) { 1777 NL_SET_ERR_MSG(extack, 1778 "BOS bit must be set in first label"); 1779 } else { 1780 NL_SET_ERR_MSG(extack, 1781 "BOS bit can only be set in first label"); 1782 } 1783 return -EINVAL; 1784 } 1785 1786 switch (dec.label) { 1787 case MPLS_LABEL_IMPLNULL: 1788 /* RFC3032: This is a label that an LSR may 1789 * assign and distribute, but which never 1790 * actually appears in the encapsulation. 1791 */ 1792 NL_SET_ERR_MSG_ATTR(extack, nla, 1793 "Implicit NULL Label (3) can not be used in encapsulation"); 1794 return -EINVAL; 1795 } 1796 1797 label[i] = dec.label; 1798 } 1799 out: 1800 *labels = nla_labels; 1801 return 0; 1802 } 1803 EXPORT_SYMBOL_GPL(nla_get_labels); 1804 1805 static int rtm_to_route_config(struct sk_buff *skb, 1806 struct nlmsghdr *nlh, 1807 struct mpls_route_config *cfg, 1808 struct netlink_ext_ack *extack) 1809 { 1810 struct rtmsg *rtm; 1811 struct nlattr *tb[RTA_MAX+1]; 1812 int index; 1813 int err; 1814 1815 err = nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX, 1816 rtm_mpls_policy, extack); 1817 if (err < 0) 1818 goto errout; 1819 1820 err = -EINVAL; 1821 rtm = nlmsg_data(nlh); 1822 1823 if (rtm->rtm_family != AF_MPLS) { 1824 NL_SET_ERR_MSG(extack, "Invalid address family in rtmsg"); 1825 goto errout; 1826 } 1827 if (rtm->rtm_dst_len != 20) { 1828 NL_SET_ERR_MSG(extack, "rtm_dst_len must be 20 for MPLS"); 1829 goto errout; 1830 } 1831 if (rtm->rtm_src_len != 0) { 1832 NL_SET_ERR_MSG(extack, "rtm_src_len must be 0 for MPLS"); 1833 goto errout; 1834 } 1835 if (rtm->rtm_tos != 0) { 1836 NL_SET_ERR_MSG(extack, "rtm_tos must be 0 for MPLS"); 1837 goto errout; 1838 } 1839 if (rtm->rtm_table != RT_TABLE_MAIN) { 1840 NL_SET_ERR_MSG(extack, 1841 "MPLS only supports the main route table"); 1842 goto errout; 1843 } 1844 /* Any value is acceptable for rtm_protocol */ 1845 1846 /* As mpls uses destination specific addresses 1847 * (or source specific address in the case of multicast) 1848 * all addresses have universal scope. 1849 */ 1850 if (rtm->rtm_scope != RT_SCOPE_UNIVERSE) { 1851 NL_SET_ERR_MSG(extack, 1852 "Invalid route scope - MPLS only supports UNIVERSE"); 1853 goto errout; 1854 } 1855 if (rtm->rtm_type != RTN_UNICAST) { 1856 NL_SET_ERR_MSG(extack, 1857 "Invalid route type - MPLS only supports UNICAST"); 1858 goto errout; 1859 } 1860 if (rtm->rtm_flags != 0) { 1861 NL_SET_ERR_MSG(extack, "rtm_flags must be 0 for MPLS"); 1862 goto errout; 1863 } 1864 1865 cfg->rc_label = LABEL_NOT_SPECIFIED; 1866 cfg->rc_protocol = rtm->rtm_protocol; 1867 cfg->rc_via_table = MPLS_NEIGH_TABLE_UNSPEC; 1868 cfg->rc_ttl_propagate = MPLS_TTL_PROP_DEFAULT; 1869 cfg->rc_nlflags = nlh->nlmsg_flags; 1870 cfg->rc_nlinfo.portid = NETLINK_CB(skb).portid; 1871 cfg->rc_nlinfo.nlh = nlh; 1872 cfg->rc_nlinfo.nl_net = sock_net(skb->sk); 1873 1874 for (index = 0; index <= RTA_MAX; index++) { 1875 struct nlattr *nla = tb[index]; 1876 if (!nla) 1877 continue; 1878 1879 switch (index) { 1880 case RTA_OIF: 1881 cfg->rc_ifindex = nla_get_u32(nla); 1882 break; 1883 case RTA_NEWDST: 1884 if (nla_get_labels(nla, MAX_NEW_LABELS, 1885 &cfg->rc_output_labels, 1886 cfg->rc_output_label, extack)) 1887 goto errout; 1888 break; 1889 case RTA_DST: 1890 { 1891 u8 label_count; 1892 if (nla_get_labels(nla, 1, &label_count, 1893 &cfg->rc_label, extack)) 1894 goto errout; 1895 1896 if (!mpls_label_ok(cfg->rc_nlinfo.nl_net, 1897 &cfg->rc_label, extack)) 1898 goto errout; 1899 break; 1900 } 1901 case RTA_GATEWAY: 1902 NL_SET_ERR_MSG(extack, "MPLS does not support RTA_GATEWAY attribute"); 1903 goto errout; 1904 case RTA_VIA: 1905 { 1906 if (nla_get_via(nla, &cfg->rc_via_alen, 1907 &cfg->rc_via_table, cfg->rc_via, 1908 extack)) 1909 goto errout; 1910 break; 1911 } 1912 case RTA_MULTIPATH: 1913 { 1914 cfg->rc_mp = nla_data(nla); 1915 cfg->rc_mp_len = nla_len(nla); 1916 break; 1917 } 1918 case RTA_TTL_PROPAGATE: 1919 { 1920 u8 ttl_propagate = nla_get_u8(nla); 1921 1922 if (ttl_propagate > 1) { 1923 NL_SET_ERR_MSG_ATTR(extack, nla, 1924 "RTA_TTL_PROPAGATE can only be 0 or 1"); 1925 goto errout; 1926 } 1927 cfg->rc_ttl_propagate = ttl_propagate ? 1928 MPLS_TTL_PROP_ENABLED : 1929 MPLS_TTL_PROP_DISABLED; 1930 break; 1931 } 1932 default: 1933 NL_SET_ERR_MSG_ATTR(extack, nla, "Unknown attribute"); 1934 /* Unsupported attribute */ 1935 goto errout; 1936 } 1937 } 1938 1939 err = 0; 1940 errout: 1941 return err; 1942 } 1943 1944 static int mpls_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, 1945 struct netlink_ext_ack *extack) 1946 { 1947 struct mpls_route_config *cfg; 1948 int err; 1949 1950 cfg = kzalloc(sizeof(*cfg), GFP_KERNEL); 1951 if (!cfg) 1952 return -ENOMEM; 1953 1954 err = rtm_to_route_config(skb, nlh, cfg, extack); 1955 if (err < 0) 1956 goto out; 1957 1958 err = mpls_route_del(cfg, extack); 1959 out: 1960 kfree(cfg); 1961 1962 return err; 1963 } 1964 1965 1966 static int mpls_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, 1967 struct netlink_ext_ack *extack) 1968 { 1969 struct mpls_route_config *cfg; 1970 int err; 1971 1972 cfg = kzalloc(sizeof(*cfg), GFP_KERNEL); 1973 if (!cfg) 1974 return -ENOMEM; 1975 1976 err = rtm_to_route_config(skb, nlh, cfg, extack); 1977 if (err < 0) 1978 goto out; 1979 1980 err = mpls_route_add(cfg, extack); 1981 out: 1982 kfree(cfg); 1983 1984 return err; 1985 } 1986 1987 static int mpls_dump_route(struct sk_buff *skb, u32 portid, u32 seq, int event, 1988 u32 label, struct mpls_route *rt, int flags) 1989 { 1990 struct net_device *dev; 1991 struct nlmsghdr *nlh; 1992 struct rtmsg *rtm; 1993 1994 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*rtm), flags); 1995 if (nlh == NULL) 1996 return -EMSGSIZE; 1997 1998 rtm = nlmsg_data(nlh); 1999 rtm->rtm_family = AF_MPLS; 2000 rtm->rtm_dst_len = 20; 2001 rtm->rtm_src_len = 0; 2002 rtm->rtm_tos = 0; 2003 rtm->rtm_table = RT_TABLE_MAIN; 2004 rtm->rtm_protocol = rt->rt_protocol; 2005 rtm->rtm_scope = RT_SCOPE_UNIVERSE; 2006 rtm->rtm_type = RTN_UNICAST; 2007 rtm->rtm_flags = 0; 2008 2009 if (nla_put_labels(skb, RTA_DST, 1, &label)) 2010 goto nla_put_failure; 2011 2012 if (rt->rt_ttl_propagate != MPLS_TTL_PROP_DEFAULT) { 2013 bool ttl_propagate = 2014 rt->rt_ttl_propagate == MPLS_TTL_PROP_ENABLED; 2015 2016 if (nla_put_u8(skb, RTA_TTL_PROPAGATE, 2017 ttl_propagate)) 2018 goto nla_put_failure; 2019 } 2020 if (rt->rt_nhn == 1) { 2021 const struct mpls_nh *nh = rt->rt_nh; 2022 2023 if (nh->nh_labels && 2024 nla_put_labels(skb, RTA_NEWDST, nh->nh_labels, 2025 nh->nh_label)) 2026 goto nla_put_failure; 2027 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC && 2028 nla_put_via(skb, nh->nh_via_table, mpls_nh_via(rt, nh), 2029 nh->nh_via_alen)) 2030 goto nla_put_failure; 2031 dev = nh->nh_dev; 2032 if (dev && nla_put_u32(skb, RTA_OIF, dev->ifindex)) 2033 goto nla_put_failure; 2034 if (nh->nh_flags & RTNH_F_LINKDOWN) 2035 rtm->rtm_flags |= RTNH_F_LINKDOWN; 2036 if (nh->nh_flags & RTNH_F_DEAD) 2037 rtm->rtm_flags |= RTNH_F_DEAD; 2038 } else { 2039 struct rtnexthop *rtnh; 2040 struct nlattr *mp; 2041 u8 linkdown = 0; 2042 u8 dead = 0; 2043 2044 mp = nla_nest_start_noflag(skb, RTA_MULTIPATH); 2045 if (!mp) 2046 goto nla_put_failure; 2047 2048 for_nexthops(rt) { 2049 dev = nh->nh_dev; 2050 if (!dev) 2051 continue; 2052 2053 rtnh = nla_reserve_nohdr(skb, sizeof(*rtnh)); 2054 if (!rtnh) 2055 goto nla_put_failure; 2056 2057 rtnh->rtnh_ifindex = dev->ifindex; 2058 if (nh->nh_flags & RTNH_F_LINKDOWN) { 2059 rtnh->rtnh_flags |= RTNH_F_LINKDOWN; 2060 linkdown++; 2061 } 2062 if (nh->nh_flags & RTNH_F_DEAD) { 2063 rtnh->rtnh_flags |= RTNH_F_DEAD; 2064 dead++; 2065 } 2066 2067 if (nh->nh_labels && nla_put_labels(skb, RTA_NEWDST, 2068 nh->nh_labels, 2069 nh->nh_label)) 2070 goto nla_put_failure; 2071 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC && 2072 nla_put_via(skb, nh->nh_via_table, 2073 mpls_nh_via(rt, nh), 2074 nh->nh_via_alen)) 2075 goto nla_put_failure; 2076 2077 /* length of rtnetlink header + attributes */ 2078 rtnh->rtnh_len = nlmsg_get_pos(skb) - (void *)rtnh; 2079 } endfor_nexthops(rt); 2080 2081 if (linkdown == rt->rt_nhn) 2082 rtm->rtm_flags |= RTNH_F_LINKDOWN; 2083 if (dead == rt->rt_nhn) 2084 rtm->rtm_flags |= RTNH_F_DEAD; 2085 2086 nla_nest_end(skb, mp); 2087 } 2088 2089 nlmsg_end(skb, nlh); 2090 return 0; 2091 2092 nla_put_failure: 2093 nlmsg_cancel(skb, nlh); 2094 return -EMSGSIZE; 2095 } 2096 2097 #if IS_ENABLED(CONFIG_INET) 2098 static int mpls_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh, 2099 struct fib_dump_filter *filter, 2100 struct netlink_callback *cb) 2101 { 2102 return ip_valid_fib_dump_req(net, nlh, filter, cb); 2103 } 2104 #else 2105 static int mpls_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh, 2106 struct fib_dump_filter *filter, 2107 struct netlink_callback *cb) 2108 { 2109 struct netlink_ext_ack *extack = cb->extack; 2110 struct nlattr *tb[RTA_MAX + 1]; 2111 struct rtmsg *rtm; 2112 int err, i; 2113 2114 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) { 2115 NL_SET_ERR_MSG_MOD(extack, "Invalid header for FIB dump request"); 2116 return -EINVAL; 2117 } 2118 2119 rtm = nlmsg_data(nlh); 2120 if (rtm->rtm_dst_len || rtm->rtm_src_len || rtm->rtm_tos || 2121 rtm->rtm_table || rtm->rtm_scope || rtm->rtm_type || 2122 rtm->rtm_flags) { 2123 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for FIB dump request"); 2124 return -EINVAL; 2125 } 2126 2127 if (rtm->rtm_protocol) { 2128 filter->protocol = rtm->rtm_protocol; 2129 filter->filter_set = 1; 2130 cb->answer_flags = NLM_F_DUMP_FILTERED; 2131 } 2132 2133 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX, 2134 rtm_mpls_policy, extack); 2135 if (err < 0) 2136 return err; 2137 2138 for (i = 0; i <= RTA_MAX; ++i) { 2139 int ifindex; 2140 2141 if (i == RTA_OIF) { 2142 ifindex = nla_get_u32(tb[i]); 2143 filter->dev = __dev_get_by_index(net, ifindex); 2144 if (!filter->dev) 2145 return -ENODEV; 2146 filter->filter_set = 1; 2147 } else if (tb[i]) { 2148 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request"); 2149 return -EINVAL; 2150 } 2151 } 2152 2153 return 0; 2154 } 2155 #endif 2156 2157 static bool mpls_rt_uses_dev(struct mpls_route *rt, 2158 const struct net_device *dev) 2159 { 2160 if (rt->rt_nhn == 1) { 2161 struct mpls_nh *nh = rt->rt_nh; 2162 2163 if (nh->nh_dev == dev) 2164 return true; 2165 } else { 2166 for_nexthops(rt) { 2167 if (nh->nh_dev == dev) 2168 return true; 2169 } endfor_nexthops(rt); 2170 } 2171 2172 return false; 2173 } 2174 2175 static int mpls_dump_routes(struct sk_buff *skb, struct netlink_callback *cb) 2176 { 2177 const struct nlmsghdr *nlh = cb->nlh; 2178 struct net *net = sock_net(skb->sk); 2179 struct mpls_route __rcu **platform_label; 2180 struct fib_dump_filter filter = {}; 2181 unsigned int flags = NLM_F_MULTI; 2182 size_t platform_labels; 2183 unsigned int index; 2184 2185 ASSERT_RTNL(); 2186 2187 if (cb->strict_check) { 2188 int err; 2189 2190 err = mpls_valid_fib_dump_req(net, nlh, &filter, cb); 2191 if (err < 0) 2192 return err; 2193 2194 /* for MPLS, there is only 1 table with fixed type and flags. 2195 * If either are set in the filter then return nothing. 2196 */ 2197 if ((filter.table_id && filter.table_id != RT_TABLE_MAIN) || 2198 (filter.rt_type && filter.rt_type != RTN_UNICAST) || 2199 filter.flags) 2200 return skb->len; 2201 } 2202 2203 index = cb->args[0]; 2204 if (index < MPLS_LABEL_FIRST_UNRESERVED) 2205 index = MPLS_LABEL_FIRST_UNRESERVED; 2206 2207 platform_label = rtnl_dereference(net->mpls.platform_label); 2208 platform_labels = net->mpls.platform_labels; 2209 2210 if (filter.filter_set) 2211 flags |= NLM_F_DUMP_FILTERED; 2212 2213 for (; index < platform_labels; index++) { 2214 struct mpls_route *rt; 2215 2216 rt = rtnl_dereference(platform_label[index]); 2217 if (!rt) 2218 continue; 2219 2220 if ((filter.dev && !mpls_rt_uses_dev(rt, filter.dev)) || 2221 (filter.protocol && rt->rt_protocol != filter.protocol)) 2222 continue; 2223 2224 if (mpls_dump_route(skb, NETLINK_CB(cb->skb).portid, 2225 cb->nlh->nlmsg_seq, RTM_NEWROUTE, 2226 index, rt, flags) < 0) 2227 break; 2228 } 2229 cb->args[0] = index; 2230 2231 return skb->len; 2232 } 2233 2234 static inline size_t lfib_nlmsg_size(struct mpls_route *rt) 2235 { 2236 size_t payload = 2237 NLMSG_ALIGN(sizeof(struct rtmsg)) 2238 + nla_total_size(4) /* RTA_DST */ 2239 + nla_total_size(1); /* RTA_TTL_PROPAGATE */ 2240 2241 if (rt->rt_nhn == 1) { 2242 struct mpls_nh *nh = rt->rt_nh; 2243 2244 if (nh->nh_dev) 2245 payload += nla_total_size(4); /* RTA_OIF */ 2246 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC) /* RTA_VIA */ 2247 payload += nla_total_size(2 + nh->nh_via_alen); 2248 if (nh->nh_labels) /* RTA_NEWDST */ 2249 payload += nla_total_size(nh->nh_labels * 4); 2250 } else { 2251 /* each nexthop is packed in an attribute */ 2252 size_t nhsize = 0; 2253 2254 for_nexthops(rt) { 2255 if (!nh->nh_dev) 2256 continue; 2257 nhsize += nla_total_size(sizeof(struct rtnexthop)); 2258 /* RTA_VIA */ 2259 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC) 2260 nhsize += nla_total_size(2 + nh->nh_via_alen); 2261 if (nh->nh_labels) 2262 nhsize += nla_total_size(nh->nh_labels * 4); 2263 } endfor_nexthops(rt); 2264 /* nested attribute */ 2265 payload += nla_total_size(nhsize); 2266 } 2267 2268 return payload; 2269 } 2270 2271 static void rtmsg_lfib(int event, u32 label, struct mpls_route *rt, 2272 struct nlmsghdr *nlh, struct net *net, u32 portid, 2273 unsigned int nlm_flags) 2274 { 2275 struct sk_buff *skb; 2276 u32 seq = nlh ? nlh->nlmsg_seq : 0; 2277 int err = -ENOBUFS; 2278 2279 skb = nlmsg_new(lfib_nlmsg_size(rt), GFP_KERNEL); 2280 if (skb == NULL) 2281 goto errout; 2282 2283 err = mpls_dump_route(skb, portid, seq, event, label, rt, nlm_flags); 2284 if (err < 0) { 2285 /* -EMSGSIZE implies BUG in lfib_nlmsg_size */ 2286 WARN_ON(err == -EMSGSIZE); 2287 kfree_skb(skb); 2288 goto errout; 2289 } 2290 rtnl_notify(skb, net, portid, RTNLGRP_MPLS_ROUTE, nlh, GFP_KERNEL); 2291 2292 return; 2293 errout: 2294 if (err < 0) 2295 rtnl_set_sk_err(net, RTNLGRP_MPLS_ROUTE, err); 2296 } 2297 2298 static int mpls_valid_getroute_req(struct sk_buff *skb, 2299 const struct nlmsghdr *nlh, 2300 struct nlattr **tb, 2301 struct netlink_ext_ack *extack) 2302 { 2303 struct rtmsg *rtm; 2304 int i, err; 2305 2306 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) { 2307 NL_SET_ERR_MSG_MOD(extack, 2308 "Invalid header for get route request"); 2309 return -EINVAL; 2310 } 2311 2312 if (!netlink_strict_get_check(skb)) 2313 return nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX, 2314 rtm_mpls_policy, extack); 2315 2316 rtm = nlmsg_data(nlh); 2317 if ((rtm->rtm_dst_len && rtm->rtm_dst_len != 20) || 2318 rtm->rtm_src_len || rtm->rtm_tos || rtm->rtm_table || 2319 rtm->rtm_protocol || rtm->rtm_scope || rtm->rtm_type) { 2320 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get route request"); 2321 return -EINVAL; 2322 } 2323 if (rtm->rtm_flags & ~RTM_F_FIB_MATCH) { 2324 NL_SET_ERR_MSG_MOD(extack, 2325 "Invalid flags for get route request"); 2326 return -EINVAL; 2327 } 2328 2329 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX, 2330 rtm_mpls_policy, extack); 2331 if (err) 2332 return err; 2333 2334 if ((tb[RTA_DST] || tb[RTA_NEWDST]) && !rtm->rtm_dst_len) { 2335 NL_SET_ERR_MSG_MOD(extack, "rtm_dst_len must be 20 for MPLS"); 2336 return -EINVAL; 2337 } 2338 2339 for (i = 0; i <= RTA_MAX; i++) { 2340 if (!tb[i]) 2341 continue; 2342 2343 switch (i) { 2344 case RTA_DST: 2345 case RTA_NEWDST: 2346 break; 2347 default: 2348 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get route request"); 2349 return -EINVAL; 2350 } 2351 } 2352 2353 return 0; 2354 } 2355 2356 static int mpls_getroute(struct sk_buff *in_skb, struct nlmsghdr *in_nlh, 2357 struct netlink_ext_ack *extack) 2358 { 2359 struct net *net = sock_net(in_skb->sk); 2360 u32 portid = NETLINK_CB(in_skb).portid; 2361 u32 in_label = LABEL_NOT_SPECIFIED; 2362 struct nlattr *tb[RTA_MAX + 1]; 2363 u32 labels[MAX_NEW_LABELS]; 2364 struct mpls_shim_hdr *hdr; 2365 unsigned int hdr_size = 0; 2366 const struct mpls_nh *nh; 2367 struct net_device *dev; 2368 struct mpls_route *rt; 2369 struct rtmsg *rtm, *r; 2370 struct nlmsghdr *nlh; 2371 struct sk_buff *skb; 2372 u8 n_labels; 2373 int err; 2374 2375 err = mpls_valid_getroute_req(in_skb, in_nlh, tb, extack); 2376 if (err < 0) 2377 goto errout; 2378 2379 rtm = nlmsg_data(in_nlh); 2380 2381 if (tb[RTA_DST]) { 2382 u8 label_count; 2383 2384 if (nla_get_labels(tb[RTA_DST], 1, &label_count, 2385 &in_label, extack)) { 2386 err = -EINVAL; 2387 goto errout; 2388 } 2389 2390 if (!mpls_label_ok(net, &in_label, extack)) { 2391 err = -EINVAL; 2392 goto errout; 2393 } 2394 } 2395 2396 rt = mpls_route_input_rcu(net, in_label); 2397 if (!rt) { 2398 err = -ENETUNREACH; 2399 goto errout; 2400 } 2401 2402 if (rtm->rtm_flags & RTM_F_FIB_MATCH) { 2403 skb = nlmsg_new(lfib_nlmsg_size(rt), GFP_KERNEL); 2404 if (!skb) { 2405 err = -ENOBUFS; 2406 goto errout; 2407 } 2408 2409 err = mpls_dump_route(skb, portid, in_nlh->nlmsg_seq, 2410 RTM_NEWROUTE, in_label, rt, 0); 2411 if (err < 0) { 2412 /* -EMSGSIZE implies BUG in lfib_nlmsg_size */ 2413 WARN_ON(err == -EMSGSIZE); 2414 goto errout_free; 2415 } 2416 2417 return rtnl_unicast(skb, net, portid); 2418 } 2419 2420 if (tb[RTA_NEWDST]) { 2421 if (nla_get_labels(tb[RTA_NEWDST], MAX_NEW_LABELS, &n_labels, 2422 labels, extack) != 0) { 2423 err = -EINVAL; 2424 goto errout; 2425 } 2426 2427 hdr_size = n_labels * sizeof(struct mpls_shim_hdr); 2428 } 2429 2430 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); 2431 if (!skb) { 2432 err = -ENOBUFS; 2433 goto errout; 2434 } 2435 2436 skb->protocol = htons(ETH_P_MPLS_UC); 2437 2438 if (hdr_size) { 2439 bool bos; 2440 int i; 2441 2442 if (skb_cow(skb, hdr_size)) { 2443 err = -ENOBUFS; 2444 goto errout_free; 2445 } 2446 2447 skb_reserve(skb, hdr_size); 2448 skb_push(skb, hdr_size); 2449 skb_reset_network_header(skb); 2450 2451 /* Push new labels */ 2452 hdr = mpls_hdr(skb); 2453 bos = true; 2454 for (i = n_labels - 1; i >= 0; i--) { 2455 hdr[i] = mpls_entry_encode(labels[i], 2456 1, 0, bos); 2457 bos = false; 2458 } 2459 } 2460 2461 nh = mpls_select_multipath(rt, skb); 2462 if (!nh) { 2463 err = -ENETUNREACH; 2464 goto errout_free; 2465 } 2466 2467 if (hdr_size) { 2468 skb_pull(skb, hdr_size); 2469 skb_reset_network_header(skb); 2470 } 2471 2472 nlh = nlmsg_put(skb, portid, in_nlh->nlmsg_seq, 2473 RTM_NEWROUTE, sizeof(*r), 0); 2474 if (!nlh) { 2475 err = -EMSGSIZE; 2476 goto errout_free; 2477 } 2478 2479 r = nlmsg_data(nlh); 2480 r->rtm_family = AF_MPLS; 2481 r->rtm_dst_len = 20; 2482 r->rtm_src_len = 0; 2483 r->rtm_table = RT_TABLE_MAIN; 2484 r->rtm_type = RTN_UNICAST; 2485 r->rtm_scope = RT_SCOPE_UNIVERSE; 2486 r->rtm_protocol = rt->rt_protocol; 2487 r->rtm_flags = 0; 2488 2489 if (nla_put_labels(skb, RTA_DST, 1, &in_label)) 2490 goto nla_put_failure; 2491 2492 if (nh->nh_labels && 2493 nla_put_labels(skb, RTA_NEWDST, nh->nh_labels, 2494 nh->nh_label)) 2495 goto nla_put_failure; 2496 2497 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC && 2498 nla_put_via(skb, nh->nh_via_table, mpls_nh_via(rt, nh), 2499 nh->nh_via_alen)) 2500 goto nla_put_failure; 2501 dev = nh->nh_dev; 2502 if (dev && nla_put_u32(skb, RTA_OIF, dev->ifindex)) 2503 goto nla_put_failure; 2504 2505 nlmsg_end(skb, nlh); 2506 2507 err = rtnl_unicast(skb, net, portid); 2508 errout: 2509 return err; 2510 2511 nla_put_failure: 2512 nlmsg_cancel(skb, nlh); 2513 err = -EMSGSIZE; 2514 errout_free: 2515 kfree_skb(skb); 2516 return err; 2517 } 2518 2519 static int resize_platform_label_table(struct net *net, size_t limit) 2520 { 2521 size_t size = sizeof(struct mpls_route *) * limit; 2522 size_t old_limit; 2523 size_t cp_size; 2524 struct mpls_route __rcu **labels = NULL, **old; 2525 struct mpls_route *rt0 = NULL, *rt2 = NULL; 2526 unsigned index; 2527 2528 if (size) { 2529 labels = kvzalloc(size, GFP_KERNEL); 2530 if (!labels) 2531 goto nolabels; 2532 } 2533 2534 /* In case the predefined labels need to be populated */ 2535 if (limit > MPLS_LABEL_IPV4NULL) { 2536 struct net_device *lo = net->loopback_dev; 2537 rt0 = mpls_rt_alloc(1, lo->addr_len, 0); 2538 if (IS_ERR(rt0)) 2539 goto nort0; 2540 rt0->rt_nh->nh_dev = lo; 2541 rt0->rt_protocol = RTPROT_KERNEL; 2542 rt0->rt_payload_type = MPT_IPV4; 2543 rt0->rt_ttl_propagate = MPLS_TTL_PROP_DEFAULT; 2544 rt0->rt_nh->nh_via_table = NEIGH_LINK_TABLE; 2545 rt0->rt_nh->nh_via_alen = lo->addr_len; 2546 memcpy(__mpls_nh_via(rt0, rt0->rt_nh), lo->dev_addr, 2547 lo->addr_len); 2548 } 2549 if (limit > MPLS_LABEL_IPV6NULL) { 2550 struct net_device *lo = net->loopback_dev; 2551 rt2 = mpls_rt_alloc(1, lo->addr_len, 0); 2552 if (IS_ERR(rt2)) 2553 goto nort2; 2554 rt2->rt_nh->nh_dev = lo; 2555 rt2->rt_protocol = RTPROT_KERNEL; 2556 rt2->rt_payload_type = MPT_IPV6; 2557 rt2->rt_ttl_propagate = MPLS_TTL_PROP_DEFAULT; 2558 rt2->rt_nh->nh_via_table = NEIGH_LINK_TABLE; 2559 rt2->rt_nh->nh_via_alen = lo->addr_len; 2560 memcpy(__mpls_nh_via(rt2, rt2->rt_nh), lo->dev_addr, 2561 lo->addr_len); 2562 } 2563 2564 rtnl_lock(); 2565 /* Remember the original table */ 2566 old = rtnl_dereference(net->mpls.platform_label); 2567 old_limit = net->mpls.platform_labels; 2568 2569 /* Free any labels beyond the new table */ 2570 for (index = limit; index < old_limit; index++) 2571 mpls_route_update(net, index, NULL, NULL); 2572 2573 /* Copy over the old labels */ 2574 cp_size = size; 2575 if (old_limit < limit) 2576 cp_size = old_limit * sizeof(struct mpls_route *); 2577 2578 memcpy(labels, old, cp_size); 2579 2580 /* If needed set the predefined labels */ 2581 if ((old_limit <= MPLS_LABEL_IPV6NULL) && 2582 (limit > MPLS_LABEL_IPV6NULL)) { 2583 RCU_INIT_POINTER(labels[MPLS_LABEL_IPV6NULL], rt2); 2584 rt2 = NULL; 2585 } 2586 2587 if ((old_limit <= MPLS_LABEL_IPV4NULL) && 2588 (limit > MPLS_LABEL_IPV4NULL)) { 2589 RCU_INIT_POINTER(labels[MPLS_LABEL_IPV4NULL], rt0); 2590 rt0 = NULL; 2591 } 2592 2593 /* Update the global pointers */ 2594 net->mpls.platform_labels = limit; 2595 rcu_assign_pointer(net->mpls.platform_label, labels); 2596 2597 rtnl_unlock(); 2598 2599 mpls_rt_free(rt2); 2600 mpls_rt_free(rt0); 2601 2602 if (old) { 2603 synchronize_rcu(); 2604 kvfree(old); 2605 } 2606 return 0; 2607 2608 nort2: 2609 mpls_rt_free(rt0); 2610 nort0: 2611 kvfree(labels); 2612 nolabels: 2613 return -ENOMEM; 2614 } 2615 2616 static int mpls_platform_labels(struct ctl_table *table, int write, 2617 void *buffer, size_t *lenp, loff_t *ppos) 2618 { 2619 struct net *net = table->data; 2620 int platform_labels = net->mpls.platform_labels; 2621 int ret; 2622 struct ctl_table tmp = { 2623 .procname = table->procname, 2624 .data = &platform_labels, 2625 .maxlen = sizeof(int), 2626 .mode = table->mode, 2627 .extra1 = SYSCTL_ZERO, 2628 .extra2 = &label_limit, 2629 }; 2630 2631 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); 2632 2633 if (write && ret == 0) 2634 ret = resize_platform_label_table(net, platform_labels); 2635 2636 return ret; 2637 } 2638 2639 #define MPLS_NS_SYSCTL_OFFSET(field) \ 2640 (&((struct net *)0)->field) 2641 2642 static const struct ctl_table mpls_table[] = { 2643 { 2644 .procname = "platform_labels", 2645 .data = NULL, 2646 .maxlen = sizeof(int), 2647 .mode = 0644, 2648 .proc_handler = mpls_platform_labels, 2649 }, 2650 { 2651 .procname = "ip_ttl_propagate", 2652 .data = MPLS_NS_SYSCTL_OFFSET(mpls.ip_ttl_propagate), 2653 .maxlen = sizeof(int), 2654 .mode = 0644, 2655 .proc_handler = proc_dointvec_minmax, 2656 .extra1 = SYSCTL_ZERO, 2657 .extra2 = SYSCTL_ONE, 2658 }, 2659 { 2660 .procname = "default_ttl", 2661 .data = MPLS_NS_SYSCTL_OFFSET(mpls.default_ttl), 2662 .maxlen = sizeof(int), 2663 .mode = 0644, 2664 .proc_handler = proc_dointvec_minmax, 2665 .extra1 = SYSCTL_ONE, 2666 .extra2 = &ttl_max, 2667 }, 2668 { } 2669 }; 2670 2671 static int mpls_net_init(struct net *net) 2672 { 2673 struct ctl_table *table; 2674 int i; 2675 2676 net->mpls.platform_labels = 0; 2677 net->mpls.platform_label = NULL; 2678 net->mpls.ip_ttl_propagate = 1; 2679 net->mpls.default_ttl = 255; 2680 2681 table = kmemdup(mpls_table, sizeof(mpls_table), GFP_KERNEL); 2682 if (table == NULL) 2683 return -ENOMEM; 2684 2685 /* Table data contains only offsets relative to the base of 2686 * the mdev at this point, so make them absolute. 2687 */ 2688 for (i = 0; i < ARRAY_SIZE(mpls_table) - 1; i++) 2689 table[i].data = (char *)net + (uintptr_t)table[i].data; 2690 2691 net->mpls.ctl = register_net_sysctl(net, "net/mpls", table); 2692 if (net->mpls.ctl == NULL) { 2693 kfree(table); 2694 return -ENOMEM; 2695 } 2696 2697 return 0; 2698 } 2699 2700 static void mpls_net_exit(struct net *net) 2701 { 2702 struct mpls_route __rcu **platform_label; 2703 size_t platform_labels; 2704 struct ctl_table *table; 2705 unsigned int index; 2706 2707 table = net->mpls.ctl->ctl_table_arg; 2708 unregister_net_sysctl_table(net->mpls.ctl); 2709 kfree(table); 2710 2711 /* An rcu grace period has passed since there was a device in 2712 * the network namespace (and thus the last in flight packet) 2713 * left this network namespace. This is because 2714 * unregister_netdevice_many and netdev_run_todo has completed 2715 * for each network device that was in this network namespace. 2716 * 2717 * As such no additional rcu synchronization is necessary when 2718 * freeing the platform_label table. 2719 */ 2720 rtnl_lock(); 2721 platform_label = rtnl_dereference(net->mpls.platform_label); 2722 platform_labels = net->mpls.platform_labels; 2723 for (index = 0; index < platform_labels; index++) { 2724 struct mpls_route *rt = rtnl_dereference(platform_label[index]); 2725 RCU_INIT_POINTER(platform_label[index], NULL); 2726 mpls_notify_route(net, index, rt, NULL, NULL); 2727 mpls_rt_free(rt); 2728 } 2729 rtnl_unlock(); 2730 2731 kvfree(platform_label); 2732 } 2733 2734 static struct pernet_operations mpls_net_ops = { 2735 .init = mpls_net_init, 2736 .exit = mpls_net_exit, 2737 }; 2738 2739 static struct rtnl_af_ops mpls_af_ops __read_mostly = { 2740 .family = AF_MPLS, 2741 .fill_stats_af = mpls_fill_stats_af, 2742 .get_stats_af_size = mpls_get_stats_af_size, 2743 }; 2744 2745 static int __init mpls_init(void) 2746 { 2747 int err; 2748 2749 BUILD_BUG_ON(sizeof(struct mpls_shim_hdr) != 4); 2750 2751 err = register_pernet_subsys(&mpls_net_ops); 2752 if (err) 2753 goto out; 2754 2755 err = register_netdevice_notifier(&mpls_dev_notifier); 2756 if (err) 2757 goto out_unregister_pernet; 2758 2759 dev_add_pack(&mpls_packet_type); 2760 2761 rtnl_af_register(&mpls_af_ops); 2762 2763 rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_NEWROUTE, 2764 mpls_rtm_newroute, NULL, 0); 2765 rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_DELROUTE, 2766 mpls_rtm_delroute, NULL, 0); 2767 rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_GETROUTE, 2768 mpls_getroute, mpls_dump_routes, 0); 2769 rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_GETNETCONF, 2770 mpls_netconf_get_devconf, 2771 mpls_netconf_dump_devconf, 0); 2772 err = ipgre_tunnel_encap_add_mpls_ops(); 2773 if (err) 2774 pr_err("Can't add mpls over gre tunnel ops\n"); 2775 2776 err = 0; 2777 out: 2778 return err; 2779 2780 out_unregister_pernet: 2781 unregister_pernet_subsys(&mpls_net_ops); 2782 goto out; 2783 } 2784 module_init(mpls_init); 2785 2786 static void __exit mpls_exit(void) 2787 { 2788 rtnl_unregister_all(PF_MPLS); 2789 rtnl_af_unregister(&mpls_af_ops); 2790 dev_remove_pack(&mpls_packet_type); 2791 unregister_netdevice_notifier(&mpls_dev_notifier); 2792 unregister_pernet_subsys(&mpls_net_ops); 2793 ipgre_tunnel_encap_del_mpls_ops(); 2794 } 2795 module_exit(mpls_exit); 2796 2797 MODULE_DESCRIPTION("MultiProtocol Label Switching"); 2798 MODULE_LICENSE("GPL v2"); 2799 MODULE_ALIAS_NETPROTO(PF_MPLS); 2800