1 // SPDX-License-Identifier: GPL-2.0-only 2 #include <linux/types.h> 3 #include <linux/skbuff.h> 4 #include <linux/socket.h> 5 #include <linux/sysctl.h> 6 #include <linux/net.h> 7 #include <linux/module.h> 8 #include <linux/if_arp.h> 9 #include <linux/ipv6.h> 10 #include <linux/mpls.h> 11 #include <linux/netconf.h> 12 #include <linux/nospec.h> 13 #include <linux/vmalloc.h> 14 #include <linux/percpu.h> 15 #include <net/gso.h> 16 #include <net/ip.h> 17 #include <net/dst.h> 18 #include <net/sock.h> 19 #include <net/arp.h> 20 #include <net/ip_fib.h> 21 #include <net/netevent.h> 22 #include <net/ip_tunnels.h> 23 #include <net/netns/generic.h> 24 #if IS_ENABLED(CONFIG_IPV6) 25 #include <net/ipv6.h> 26 #endif 27 #include <net/ipv6_stubs.h> 28 #include <net/rtnh.h> 29 #include "internal.h" 30 31 /* max memory we will use for mpls_route */ 32 #define MAX_MPLS_ROUTE_MEM 4096 33 34 /* Maximum number of labels to look ahead at when selecting a path of 35 * a multipath route 36 */ 37 #define MAX_MP_SELECT_LABELS 4 38 39 #define MPLS_NEIGH_TABLE_UNSPEC (NEIGH_LINK_TABLE + 1) 40 41 static int label_limit = (1 << 20) - 1; 42 static int ttl_max = 255; 43 44 #if IS_ENABLED(CONFIG_NET_IP_TUNNEL) 45 static size_t ipgre_mpls_encap_hlen(struct ip_tunnel_encap *e) 46 { 47 return sizeof(struct mpls_shim_hdr); 48 } 49 50 static const struct ip_tunnel_encap_ops mpls_iptun_ops = { 51 .encap_hlen = ipgre_mpls_encap_hlen, 52 }; 53 54 static int ipgre_tunnel_encap_add_mpls_ops(void) 55 { 56 return ip_tunnel_encap_add_ops(&mpls_iptun_ops, TUNNEL_ENCAP_MPLS); 57 } 58 59 static void ipgre_tunnel_encap_del_mpls_ops(void) 60 { 61 ip_tunnel_encap_del_ops(&mpls_iptun_ops, TUNNEL_ENCAP_MPLS); 62 } 63 #else 64 static int ipgre_tunnel_encap_add_mpls_ops(void) 65 { 66 return 0; 67 } 68 69 static void ipgre_tunnel_encap_del_mpls_ops(void) 70 { 71 } 72 #endif 73 74 static void rtmsg_lfib(int event, u32 label, struct mpls_route *rt, 75 struct nlmsghdr *nlh, struct net *net, u32 portid, 76 unsigned int nlm_flags); 77 78 static struct mpls_route *mpls_route_input_rcu(struct net *net, unsigned index) 79 { 80 struct mpls_route *rt = NULL; 81 82 if (index < net->mpls.platform_labels) { 83 struct mpls_route __rcu **platform_label = 84 rcu_dereference(net->mpls.platform_label); 85 rt = rcu_dereference(platform_label[index]); 86 } 87 return rt; 88 } 89 90 bool mpls_output_possible(const struct net_device *dev) 91 { 92 return dev && (dev->flags & IFF_UP) && netif_carrier_ok(dev); 93 } 94 EXPORT_SYMBOL_GPL(mpls_output_possible); 95 96 static u8 *__mpls_nh_via(struct mpls_route *rt, struct mpls_nh *nh) 97 { 98 return (u8 *)nh + rt->rt_via_offset; 99 } 100 101 static const u8 *mpls_nh_via(const struct mpls_route *rt, 102 const struct mpls_nh *nh) 103 { 104 return __mpls_nh_via((struct mpls_route *)rt, (struct mpls_nh *)nh); 105 } 106 107 static unsigned int mpls_nh_header_size(const struct mpls_nh *nh) 108 { 109 /* The size of the layer 2.5 labels to be added for this route */ 110 return nh->nh_labels * sizeof(struct mpls_shim_hdr); 111 } 112 113 unsigned int mpls_dev_mtu(const struct net_device *dev) 114 { 115 /* The amount of data the layer 2 frame can hold */ 116 return dev->mtu; 117 } 118 EXPORT_SYMBOL_GPL(mpls_dev_mtu); 119 120 bool mpls_pkt_too_big(const struct sk_buff *skb, unsigned int mtu) 121 { 122 if (skb->len <= mtu) 123 return false; 124 125 if (skb_is_gso(skb) && skb_gso_validate_network_len(skb, mtu)) 126 return false; 127 128 return true; 129 } 130 EXPORT_SYMBOL_GPL(mpls_pkt_too_big); 131 132 void mpls_stats_inc_outucastpkts(struct net_device *dev, 133 const struct sk_buff *skb) 134 { 135 struct mpls_dev *mdev; 136 137 if (skb->protocol == htons(ETH_P_MPLS_UC)) { 138 mdev = mpls_dev_get(dev); 139 if (mdev) 140 MPLS_INC_STATS_LEN(mdev, skb->len, 141 tx_packets, 142 tx_bytes); 143 } else if (skb->protocol == htons(ETH_P_IP)) { 144 IP_UPD_PO_STATS(dev_net(dev), IPSTATS_MIB_OUT, skb->len); 145 #if IS_ENABLED(CONFIG_IPV6) 146 } else if (skb->protocol == htons(ETH_P_IPV6)) { 147 struct inet6_dev *in6dev = __in6_dev_get(dev); 148 149 if (in6dev) 150 IP6_UPD_PO_STATS(dev_net(dev), in6dev, 151 IPSTATS_MIB_OUT, skb->len); 152 #endif 153 } 154 } 155 EXPORT_SYMBOL_GPL(mpls_stats_inc_outucastpkts); 156 157 static u32 mpls_multipath_hash(struct mpls_route *rt, struct sk_buff *skb) 158 { 159 struct mpls_entry_decoded dec; 160 unsigned int mpls_hdr_len = 0; 161 struct mpls_shim_hdr *hdr; 162 bool eli_seen = false; 163 int label_index; 164 u32 hash = 0; 165 166 for (label_index = 0; label_index < MAX_MP_SELECT_LABELS; 167 label_index++) { 168 mpls_hdr_len += sizeof(*hdr); 169 if (!pskb_may_pull(skb, mpls_hdr_len)) 170 break; 171 172 /* Read and decode the current label */ 173 hdr = mpls_hdr(skb) + label_index; 174 dec = mpls_entry_decode(hdr); 175 176 /* RFC6790 - reserved labels MUST NOT be used as keys 177 * for the load-balancing function 178 */ 179 if (likely(dec.label >= MPLS_LABEL_FIRST_UNRESERVED)) { 180 hash = jhash_1word(dec.label, hash); 181 182 /* The entropy label follows the entropy label 183 * indicator, so this means that the entropy 184 * label was just added to the hash - no need to 185 * go any deeper either in the label stack or in the 186 * payload 187 */ 188 if (eli_seen) 189 break; 190 } else if (dec.label == MPLS_LABEL_ENTROPY) { 191 eli_seen = true; 192 } 193 194 if (!dec.bos) 195 continue; 196 197 /* found bottom label; does skb have room for a header? */ 198 if (pskb_may_pull(skb, mpls_hdr_len + sizeof(struct iphdr))) { 199 const struct iphdr *v4hdr; 200 201 v4hdr = (const struct iphdr *)(hdr + 1); 202 if (v4hdr->version == 4) { 203 hash = jhash_3words(ntohl(v4hdr->saddr), 204 ntohl(v4hdr->daddr), 205 v4hdr->protocol, hash); 206 } else if (v4hdr->version == 6 && 207 pskb_may_pull(skb, mpls_hdr_len + 208 sizeof(struct ipv6hdr))) { 209 const struct ipv6hdr *v6hdr; 210 211 v6hdr = (const struct ipv6hdr *)(hdr + 1); 212 hash = __ipv6_addr_jhash(&v6hdr->saddr, hash); 213 hash = __ipv6_addr_jhash(&v6hdr->daddr, hash); 214 hash = jhash_1word(v6hdr->nexthdr, hash); 215 } 216 } 217 218 break; 219 } 220 221 return hash; 222 } 223 224 static struct mpls_nh *mpls_get_nexthop(struct mpls_route *rt, u8 index) 225 { 226 return (struct mpls_nh *)((u8 *)rt->rt_nh + index * rt->rt_nh_size); 227 } 228 229 /* number of alive nexthops (rt->rt_nhn_alive) and the flags for 230 * a next hop (nh->nh_flags) are modified by netdev event handlers. 231 * Since those fields can change at any moment, use READ_ONCE to 232 * access both. 233 */ 234 static const struct mpls_nh *mpls_select_multipath(struct mpls_route *rt, 235 struct sk_buff *skb) 236 { 237 u32 hash = 0; 238 int nh_index = 0; 239 int n = 0; 240 u8 alive; 241 242 /* No need to look further into packet if there's only 243 * one path 244 */ 245 if (rt->rt_nhn == 1) 246 return rt->rt_nh; 247 248 alive = READ_ONCE(rt->rt_nhn_alive); 249 if (alive == 0) 250 return NULL; 251 252 hash = mpls_multipath_hash(rt, skb); 253 nh_index = hash % alive; 254 if (alive == rt->rt_nhn) 255 goto out; 256 for_nexthops(rt) { 257 unsigned int nh_flags = READ_ONCE(nh->nh_flags); 258 259 if (nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)) 260 continue; 261 if (n == nh_index) 262 return nh; 263 n++; 264 } endfor_nexthops(rt); 265 266 out: 267 return mpls_get_nexthop(rt, nh_index); 268 } 269 270 static bool mpls_egress(struct net *net, struct mpls_route *rt, 271 struct sk_buff *skb, struct mpls_entry_decoded dec) 272 { 273 enum mpls_payload_type payload_type; 274 bool success = false; 275 276 /* The IPv4 code below accesses through the IPv4 header 277 * checksum, which is 12 bytes into the packet. 278 * The IPv6 code below accesses through the IPv6 hop limit 279 * which is 8 bytes into the packet. 280 * 281 * For all supported cases there should always be at least 12 282 * bytes of packet data present. The IPv4 header is 20 bytes 283 * without options and the IPv6 header is always 40 bytes 284 * long. 285 */ 286 if (!pskb_may_pull(skb, 12)) 287 return false; 288 289 payload_type = rt->rt_payload_type; 290 if (payload_type == MPT_UNSPEC) 291 payload_type = ip_hdr(skb)->version; 292 293 switch (payload_type) { 294 case MPT_IPV4: { 295 struct iphdr *hdr4 = ip_hdr(skb); 296 u8 new_ttl; 297 skb->protocol = htons(ETH_P_IP); 298 299 /* If propagating TTL, take the decremented TTL from 300 * the incoming MPLS header, otherwise decrement the 301 * TTL, but only if not 0 to avoid underflow. 302 */ 303 if (rt->rt_ttl_propagate == MPLS_TTL_PROP_ENABLED || 304 (rt->rt_ttl_propagate == MPLS_TTL_PROP_DEFAULT && 305 net->mpls.ip_ttl_propagate)) 306 new_ttl = dec.ttl; 307 else 308 new_ttl = hdr4->ttl ? hdr4->ttl - 1 : 0; 309 310 csum_replace2(&hdr4->check, 311 htons(hdr4->ttl << 8), 312 htons(new_ttl << 8)); 313 hdr4->ttl = new_ttl; 314 success = true; 315 break; 316 } 317 case MPT_IPV6: { 318 struct ipv6hdr *hdr6 = ipv6_hdr(skb); 319 skb->protocol = htons(ETH_P_IPV6); 320 321 /* If propagating TTL, take the decremented TTL from 322 * the incoming MPLS header, otherwise decrement the 323 * hop limit, but only if not 0 to avoid underflow. 324 */ 325 if (rt->rt_ttl_propagate == MPLS_TTL_PROP_ENABLED || 326 (rt->rt_ttl_propagate == MPLS_TTL_PROP_DEFAULT && 327 net->mpls.ip_ttl_propagate)) 328 hdr6->hop_limit = dec.ttl; 329 else if (hdr6->hop_limit) 330 hdr6->hop_limit = hdr6->hop_limit - 1; 331 success = true; 332 break; 333 } 334 case MPT_UNSPEC: 335 /* Should have decided which protocol it is by now */ 336 break; 337 } 338 339 return success; 340 } 341 342 static int mpls_forward(struct sk_buff *skb, struct net_device *dev, 343 struct packet_type *pt, struct net_device *orig_dev) 344 { 345 struct net *net = dev_net(dev); 346 struct mpls_shim_hdr *hdr; 347 const struct mpls_nh *nh; 348 struct mpls_route *rt; 349 struct mpls_entry_decoded dec; 350 struct net_device *out_dev; 351 struct mpls_dev *out_mdev; 352 struct mpls_dev *mdev; 353 unsigned int hh_len; 354 unsigned int new_header_size; 355 unsigned int mtu; 356 int err; 357 358 /* Careful this entire function runs inside of an rcu critical section */ 359 360 mdev = mpls_dev_get(dev); 361 if (!mdev) 362 goto drop; 363 364 MPLS_INC_STATS_LEN(mdev, skb->len, rx_packets, 365 rx_bytes); 366 367 if (!mdev->input_enabled) { 368 MPLS_INC_STATS(mdev, rx_dropped); 369 goto drop; 370 } 371 372 if (skb->pkt_type != PACKET_HOST) 373 goto err; 374 375 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) 376 goto err; 377 378 if (!pskb_may_pull(skb, sizeof(*hdr))) 379 goto err; 380 381 skb_dst_drop(skb); 382 383 /* Read and decode the label */ 384 hdr = mpls_hdr(skb); 385 dec = mpls_entry_decode(hdr); 386 387 rt = mpls_route_input_rcu(net, dec.label); 388 if (!rt) { 389 MPLS_INC_STATS(mdev, rx_noroute); 390 goto drop; 391 } 392 393 nh = mpls_select_multipath(rt, skb); 394 if (!nh) 395 goto err; 396 397 /* Pop the label */ 398 skb_pull(skb, sizeof(*hdr)); 399 skb_reset_network_header(skb); 400 401 skb_orphan(skb); 402 403 if (skb_warn_if_lro(skb)) 404 goto err; 405 406 skb_forward_csum(skb); 407 408 /* Verify ttl is valid */ 409 if (dec.ttl <= 1) 410 goto err; 411 412 /* Find the output device */ 413 out_dev = nh->nh_dev; 414 if (!mpls_output_possible(out_dev)) 415 goto tx_err; 416 417 /* Verify the destination can hold the packet */ 418 new_header_size = mpls_nh_header_size(nh); 419 mtu = mpls_dev_mtu(out_dev); 420 if (mpls_pkt_too_big(skb, mtu - new_header_size)) 421 goto tx_err; 422 423 hh_len = LL_RESERVED_SPACE(out_dev); 424 if (!out_dev->header_ops) 425 hh_len = 0; 426 427 /* Ensure there is enough space for the headers in the skb */ 428 if (skb_cow(skb, hh_len + new_header_size)) 429 goto tx_err; 430 431 skb->dev = out_dev; 432 skb->protocol = htons(ETH_P_MPLS_UC); 433 434 dec.ttl -= 1; 435 if (unlikely(!new_header_size && dec.bos)) { 436 /* Penultimate hop popping */ 437 if (!mpls_egress(dev_net(out_dev), rt, skb, dec)) 438 goto err; 439 } else { 440 bool bos; 441 int i; 442 skb_push(skb, new_header_size); 443 skb_reset_network_header(skb); 444 /* Push the new labels */ 445 hdr = mpls_hdr(skb); 446 bos = dec.bos; 447 for (i = nh->nh_labels - 1; i >= 0; i--) { 448 hdr[i] = mpls_entry_encode(nh->nh_label[i], 449 dec.ttl, 0, bos); 450 bos = false; 451 } 452 } 453 454 mpls_stats_inc_outucastpkts(out_dev, skb); 455 456 /* If via wasn't specified then send out using device address */ 457 if (nh->nh_via_table == MPLS_NEIGH_TABLE_UNSPEC) 458 err = neigh_xmit(NEIGH_LINK_TABLE, out_dev, 459 out_dev->dev_addr, skb); 460 else 461 err = neigh_xmit(nh->nh_via_table, out_dev, 462 mpls_nh_via(rt, nh), skb); 463 if (err) 464 net_dbg_ratelimited("%s: packet transmission failed: %d\n", 465 __func__, err); 466 return 0; 467 468 tx_err: 469 out_mdev = out_dev ? mpls_dev_get(out_dev) : NULL; 470 if (out_mdev) 471 MPLS_INC_STATS(out_mdev, tx_errors); 472 goto drop; 473 err: 474 MPLS_INC_STATS(mdev, rx_errors); 475 drop: 476 kfree_skb(skb); 477 return NET_RX_DROP; 478 } 479 480 static struct packet_type mpls_packet_type __read_mostly = { 481 .type = cpu_to_be16(ETH_P_MPLS_UC), 482 .func = mpls_forward, 483 }; 484 485 static const struct nla_policy rtm_mpls_policy[RTA_MAX+1] = { 486 [RTA_DST] = { .type = NLA_U32 }, 487 [RTA_OIF] = { .type = NLA_U32 }, 488 [RTA_TTL_PROPAGATE] = { .type = NLA_U8 }, 489 }; 490 491 struct mpls_route_config { 492 u32 rc_protocol; 493 u32 rc_ifindex; 494 u8 rc_via_table; 495 u8 rc_via_alen; 496 u8 rc_via[MAX_VIA_ALEN]; 497 u32 rc_label; 498 u8 rc_ttl_propagate; 499 u8 rc_output_labels; 500 u32 rc_output_label[MAX_NEW_LABELS]; 501 u32 rc_nlflags; 502 enum mpls_payload_type rc_payload_type; 503 struct nl_info rc_nlinfo; 504 struct rtnexthop *rc_mp; 505 int rc_mp_len; 506 }; 507 508 /* all nexthops within a route have the same size based on max 509 * number of labels and max via length for a hop 510 */ 511 static struct mpls_route *mpls_rt_alloc(u8 num_nh, u8 max_alen, u8 max_labels) 512 { 513 u8 nh_size = MPLS_NH_SIZE(max_labels, max_alen); 514 struct mpls_route *rt; 515 size_t size; 516 517 size = sizeof(*rt) + num_nh * nh_size; 518 if (size > MAX_MPLS_ROUTE_MEM) 519 return ERR_PTR(-EINVAL); 520 521 rt = kzalloc(size, GFP_KERNEL); 522 if (!rt) 523 return ERR_PTR(-ENOMEM); 524 525 rt->rt_nhn = num_nh; 526 rt->rt_nhn_alive = num_nh; 527 rt->rt_nh_size = nh_size; 528 rt->rt_via_offset = MPLS_NH_VIA_OFF(max_labels); 529 530 return rt; 531 } 532 533 static void mpls_rt_free(struct mpls_route *rt) 534 { 535 if (rt) 536 kfree_rcu(rt, rt_rcu); 537 } 538 539 static void mpls_notify_route(struct net *net, unsigned index, 540 struct mpls_route *old, struct mpls_route *new, 541 const struct nl_info *info) 542 { 543 struct nlmsghdr *nlh = info ? info->nlh : NULL; 544 unsigned portid = info ? info->portid : 0; 545 int event = new ? RTM_NEWROUTE : RTM_DELROUTE; 546 struct mpls_route *rt = new ? new : old; 547 unsigned nlm_flags = (old && new) ? NLM_F_REPLACE : 0; 548 /* Ignore reserved labels for now */ 549 if (rt && (index >= MPLS_LABEL_FIRST_UNRESERVED)) 550 rtmsg_lfib(event, index, rt, nlh, net, portid, nlm_flags); 551 } 552 553 static void mpls_route_update(struct net *net, unsigned index, 554 struct mpls_route *new, 555 const struct nl_info *info) 556 { 557 struct mpls_route __rcu **platform_label; 558 struct mpls_route *rt; 559 560 ASSERT_RTNL(); 561 562 platform_label = rtnl_dereference(net->mpls.platform_label); 563 rt = rtnl_dereference(platform_label[index]); 564 rcu_assign_pointer(platform_label[index], new); 565 566 mpls_notify_route(net, index, rt, new, info); 567 568 /* If we removed a route free it now */ 569 mpls_rt_free(rt); 570 } 571 572 static unsigned find_free_label(struct net *net) 573 { 574 struct mpls_route __rcu **platform_label; 575 size_t platform_labels; 576 unsigned index; 577 578 platform_label = rtnl_dereference(net->mpls.platform_label); 579 platform_labels = net->mpls.platform_labels; 580 for (index = MPLS_LABEL_FIRST_UNRESERVED; index < platform_labels; 581 index++) { 582 if (!rtnl_dereference(platform_label[index])) 583 return index; 584 } 585 return LABEL_NOT_SPECIFIED; 586 } 587 588 #if IS_ENABLED(CONFIG_INET) 589 static struct net_device *inet_fib_lookup_dev(struct net *net, 590 const void *addr) 591 { 592 struct net_device *dev; 593 struct rtable *rt; 594 struct in_addr daddr; 595 596 memcpy(&daddr, addr, sizeof(struct in_addr)); 597 rt = ip_route_output(net, daddr.s_addr, 0, 0, 0); 598 if (IS_ERR(rt)) 599 return ERR_CAST(rt); 600 601 dev = rt->dst.dev; 602 dev_hold(dev); 603 604 ip_rt_put(rt); 605 606 return dev; 607 } 608 #else 609 static struct net_device *inet_fib_lookup_dev(struct net *net, 610 const void *addr) 611 { 612 return ERR_PTR(-EAFNOSUPPORT); 613 } 614 #endif 615 616 #if IS_ENABLED(CONFIG_IPV6) 617 static struct net_device *inet6_fib_lookup_dev(struct net *net, 618 const void *addr) 619 { 620 struct net_device *dev; 621 struct dst_entry *dst; 622 struct flowi6 fl6; 623 624 if (!ipv6_stub) 625 return ERR_PTR(-EAFNOSUPPORT); 626 627 memset(&fl6, 0, sizeof(fl6)); 628 memcpy(&fl6.daddr, addr, sizeof(struct in6_addr)); 629 dst = ipv6_stub->ipv6_dst_lookup_flow(net, NULL, &fl6, NULL); 630 if (IS_ERR(dst)) 631 return ERR_CAST(dst); 632 633 dev = dst->dev; 634 dev_hold(dev); 635 dst_release(dst); 636 637 return dev; 638 } 639 #else 640 static struct net_device *inet6_fib_lookup_dev(struct net *net, 641 const void *addr) 642 { 643 return ERR_PTR(-EAFNOSUPPORT); 644 } 645 #endif 646 647 static struct net_device *find_outdev(struct net *net, 648 struct mpls_route *rt, 649 struct mpls_nh *nh, int oif) 650 { 651 struct net_device *dev = NULL; 652 653 if (!oif) { 654 switch (nh->nh_via_table) { 655 case NEIGH_ARP_TABLE: 656 dev = inet_fib_lookup_dev(net, mpls_nh_via(rt, nh)); 657 break; 658 case NEIGH_ND_TABLE: 659 dev = inet6_fib_lookup_dev(net, mpls_nh_via(rt, nh)); 660 break; 661 case NEIGH_LINK_TABLE: 662 break; 663 } 664 } else { 665 dev = dev_get_by_index(net, oif); 666 } 667 668 if (!dev) 669 return ERR_PTR(-ENODEV); 670 671 if (IS_ERR(dev)) 672 return dev; 673 674 /* The caller is holding rtnl anyways, so release the dev reference */ 675 dev_put(dev); 676 677 return dev; 678 } 679 680 static int mpls_nh_assign_dev(struct net *net, struct mpls_route *rt, 681 struct mpls_nh *nh, int oif) 682 { 683 struct net_device *dev = NULL; 684 int err = -ENODEV; 685 686 dev = find_outdev(net, rt, nh, oif); 687 if (IS_ERR(dev)) { 688 err = PTR_ERR(dev); 689 dev = NULL; 690 goto errout; 691 } 692 693 /* Ensure this is a supported device */ 694 err = -EINVAL; 695 if (!mpls_dev_get(dev)) 696 goto errout; 697 698 if ((nh->nh_via_table == NEIGH_LINK_TABLE) && 699 (dev->addr_len != nh->nh_via_alen)) 700 goto errout; 701 702 nh->nh_dev = dev; 703 704 if (!(dev->flags & IFF_UP)) { 705 nh->nh_flags |= RTNH_F_DEAD; 706 } else { 707 unsigned int flags; 708 709 flags = dev_get_flags(dev); 710 if (!(flags & (IFF_RUNNING | IFF_LOWER_UP))) 711 nh->nh_flags |= RTNH_F_LINKDOWN; 712 } 713 714 return 0; 715 716 errout: 717 return err; 718 } 719 720 static int nla_get_via(const struct nlattr *nla, u8 *via_alen, u8 *via_table, 721 u8 via_addr[], struct netlink_ext_ack *extack) 722 { 723 struct rtvia *via = nla_data(nla); 724 int err = -EINVAL; 725 int alen; 726 727 if (nla_len(nla) < offsetof(struct rtvia, rtvia_addr)) { 728 NL_SET_ERR_MSG_ATTR(extack, nla, 729 "Invalid attribute length for RTA_VIA"); 730 goto errout; 731 } 732 alen = nla_len(nla) - 733 offsetof(struct rtvia, rtvia_addr); 734 if (alen > MAX_VIA_ALEN) { 735 NL_SET_ERR_MSG_ATTR(extack, nla, 736 "Invalid address length for RTA_VIA"); 737 goto errout; 738 } 739 740 /* Validate the address family */ 741 switch (via->rtvia_family) { 742 case AF_PACKET: 743 *via_table = NEIGH_LINK_TABLE; 744 break; 745 case AF_INET: 746 *via_table = NEIGH_ARP_TABLE; 747 if (alen != 4) 748 goto errout; 749 break; 750 case AF_INET6: 751 *via_table = NEIGH_ND_TABLE; 752 if (alen != 16) 753 goto errout; 754 break; 755 default: 756 /* Unsupported address family */ 757 goto errout; 758 } 759 760 memcpy(via_addr, via->rtvia_addr, alen); 761 *via_alen = alen; 762 err = 0; 763 764 errout: 765 return err; 766 } 767 768 static int mpls_nh_build_from_cfg(struct mpls_route_config *cfg, 769 struct mpls_route *rt) 770 { 771 struct net *net = cfg->rc_nlinfo.nl_net; 772 struct mpls_nh *nh = rt->rt_nh; 773 int err; 774 int i; 775 776 if (!nh) 777 return -ENOMEM; 778 779 nh->nh_labels = cfg->rc_output_labels; 780 for (i = 0; i < nh->nh_labels; i++) 781 nh->nh_label[i] = cfg->rc_output_label[i]; 782 783 nh->nh_via_table = cfg->rc_via_table; 784 memcpy(__mpls_nh_via(rt, nh), cfg->rc_via, cfg->rc_via_alen); 785 nh->nh_via_alen = cfg->rc_via_alen; 786 787 err = mpls_nh_assign_dev(net, rt, nh, cfg->rc_ifindex); 788 if (err) 789 goto errout; 790 791 if (nh->nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)) 792 rt->rt_nhn_alive--; 793 794 return 0; 795 796 errout: 797 return err; 798 } 799 800 static int mpls_nh_build(struct net *net, struct mpls_route *rt, 801 struct mpls_nh *nh, int oif, struct nlattr *via, 802 struct nlattr *newdst, u8 max_labels, 803 struct netlink_ext_ack *extack) 804 { 805 int err = -ENOMEM; 806 807 if (!nh) 808 goto errout; 809 810 if (newdst) { 811 err = nla_get_labels(newdst, max_labels, &nh->nh_labels, 812 nh->nh_label, extack); 813 if (err) 814 goto errout; 815 } 816 817 if (via) { 818 err = nla_get_via(via, &nh->nh_via_alen, &nh->nh_via_table, 819 __mpls_nh_via(rt, nh), extack); 820 if (err) 821 goto errout; 822 } else { 823 nh->nh_via_table = MPLS_NEIGH_TABLE_UNSPEC; 824 } 825 826 err = mpls_nh_assign_dev(net, rt, nh, oif); 827 if (err) 828 goto errout; 829 830 return 0; 831 832 errout: 833 return err; 834 } 835 836 static u8 mpls_count_nexthops(struct rtnexthop *rtnh, int len, 837 u8 cfg_via_alen, u8 *max_via_alen, 838 u8 *max_labels) 839 { 840 int remaining = len; 841 u8 nhs = 0; 842 843 *max_via_alen = 0; 844 *max_labels = 0; 845 846 while (rtnh_ok(rtnh, remaining)) { 847 struct nlattr *nla, *attrs = rtnh_attrs(rtnh); 848 int attrlen; 849 u8 n_labels = 0; 850 851 attrlen = rtnh_attrlen(rtnh); 852 nla = nla_find(attrs, attrlen, RTA_VIA); 853 if (nla && nla_len(nla) >= 854 offsetof(struct rtvia, rtvia_addr)) { 855 int via_alen = nla_len(nla) - 856 offsetof(struct rtvia, rtvia_addr); 857 858 if (via_alen <= MAX_VIA_ALEN) 859 *max_via_alen = max_t(u16, *max_via_alen, 860 via_alen); 861 } 862 863 nla = nla_find(attrs, attrlen, RTA_NEWDST); 864 if (nla && 865 nla_get_labels(nla, MAX_NEW_LABELS, &n_labels, 866 NULL, NULL) != 0) 867 return 0; 868 869 *max_labels = max_t(u8, *max_labels, n_labels); 870 871 /* number of nexthops is tracked by a u8. 872 * Check for overflow. 873 */ 874 if (nhs == 255) 875 return 0; 876 nhs++; 877 878 rtnh = rtnh_next(rtnh, &remaining); 879 } 880 881 /* leftover implies invalid nexthop configuration, discard it */ 882 return remaining > 0 ? 0 : nhs; 883 } 884 885 static int mpls_nh_build_multi(struct mpls_route_config *cfg, 886 struct mpls_route *rt, u8 max_labels, 887 struct netlink_ext_ack *extack) 888 { 889 struct rtnexthop *rtnh = cfg->rc_mp; 890 struct nlattr *nla_via, *nla_newdst; 891 int remaining = cfg->rc_mp_len; 892 int err = 0; 893 u8 nhs = 0; 894 895 change_nexthops(rt) { 896 int attrlen; 897 898 nla_via = NULL; 899 nla_newdst = NULL; 900 901 err = -EINVAL; 902 if (!rtnh_ok(rtnh, remaining)) 903 goto errout; 904 905 /* neither weighted multipath nor any flags 906 * are supported 907 */ 908 if (rtnh->rtnh_hops || rtnh->rtnh_flags) 909 goto errout; 910 911 attrlen = rtnh_attrlen(rtnh); 912 if (attrlen > 0) { 913 struct nlattr *attrs = rtnh_attrs(rtnh); 914 915 nla_via = nla_find(attrs, attrlen, RTA_VIA); 916 nla_newdst = nla_find(attrs, attrlen, RTA_NEWDST); 917 } 918 919 err = mpls_nh_build(cfg->rc_nlinfo.nl_net, rt, nh, 920 rtnh->rtnh_ifindex, nla_via, nla_newdst, 921 max_labels, extack); 922 if (err) 923 goto errout; 924 925 if (nh->nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)) 926 rt->rt_nhn_alive--; 927 928 rtnh = rtnh_next(rtnh, &remaining); 929 nhs++; 930 } endfor_nexthops(rt); 931 932 rt->rt_nhn = nhs; 933 934 return 0; 935 936 errout: 937 return err; 938 } 939 940 static bool mpls_label_ok(struct net *net, unsigned int *index, 941 struct netlink_ext_ack *extack) 942 { 943 bool is_ok = true; 944 945 /* Reserved labels may not be set */ 946 if (*index < MPLS_LABEL_FIRST_UNRESERVED) { 947 NL_SET_ERR_MSG(extack, 948 "Invalid label - must be MPLS_LABEL_FIRST_UNRESERVED or higher"); 949 is_ok = false; 950 } 951 952 /* The full 20 bit range may not be supported. */ 953 if (is_ok && *index >= net->mpls.platform_labels) { 954 NL_SET_ERR_MSG(extack, 955 "Label >= configured maximum in platform_labels"); 956 is_ok = false; 957 } 958 959 *index = array_index_nospec(*index, net->mpls.platform_labels); 960 return is_ok; 961 } 962 963 static int mpls_route_add(struct mpls_route_config *cfg, 964 struct netlink_ext_ack *extack) 965 { 966 struct mpls_route __rcu **platform_label; 967 struct net *net = cfg->rc_nlinfo.nl_net; 968 struct mpls_route *rt, *old; 969 int err = -EINVAL; 970 u8 max_via_alen; 971 unsigned index; 972 u8 max_labels; 973 u8 nhs; 974 975 index = cfg->rc_label; 976 977 /* If a label was not specified during insert pick one */ 978 if ((index == LABEL_NOT_SPECIFIED) && 979 (cfg->rc_nlflags & NLM_F_CREATE)) { 980 index = find_free_label(net); 981 } 982 983 if (!mpls_label_ok(net, &index, extack)) 984 goto errout; 985 986 /* Append makes no sense with mpls */ 987 err = -EOPNOTSUPP; 988 if (cfg->rc_nlflags & NLM_F_APPEND) { 989 NL_SET_ERR_MSG(extack, "MPLS does not support route append"); 990 goto errout; 991 } 992 993 err = -EEXIST; 994 platform_label = rtnl_dereference(net->mpls.platform_label); 995 old = rtnl_dereference(platform_label[index]); 996 if ((cfg->rc_nlflags & NLM_F_EXCL) && old) 997 goto errout; 998 999 err = -EEXIST; 1000 if (!(cfg->rc_nlflags & NLM_F_REPLACE) && old) 1001 goto errout; 1002 1003 err = -ENOENT; 1004 if (!(cfg->rc_nlflags & NLM_F_CREATE) && !old) 1005 goto errout; 1006 1007 err = -EINVAL; 1008 if (cfg->rc_mp) { 1009 nhs = mpls_count_nexthops(cfg->rc_mp, cfg->rc_mp_len, 1010 cfg->rc_via_alen, &max_via_alen, 1011 &max_labels); 1012 } else { 1013 max_via_alen = cfg->rc_via_alen; 1014 max_labels = cfg->rc_output_labels; 1015 nhs = 1; 1016 } 1017 1018 if (nhs == 0) { 1019 NL_SET_ERR_MSG(extack, "Route does not contain a nexthop"); 1020 goto errout; 1021 } 1022 1023 rt = mpls_rt_alloc(nhs, max_via_alen, max_labels); 1024 if (IS_ERR(rt)) { 1025 err = PTR_ERR(rt); 1026 goto errout; 1027 } 1028 1029 rt->rt_protocol = cfg->rc_protocol; 1030 rt->rt_payload_type = cfg->rc_payload_type; 1031 rt->rt_ttl_propagate = cfg->rc_ttl_propagate; 1032 1033 if (cfg->rc_mp) 1034 err = mpls_nh_build_multi(cfg, rt, max_labels, extack); 1035 else 1036 err = mpls_nh_build_from_cfg(cfg, rt); 1037 if (err) 1038 goto freert; 1039 1040 mpls_route_update(net, index, rt, &cfg->rc_nlinfo); 1041 1042 return 0; 1043 1044 freert: 1045 mpls_rt_free(rt); 1046 errout: 1047 return err; 1048 } 1049 1050 static int mpls_route_del(struct mpls_route_config *cfg, 1051 struct netlink_ext_ack *extack) 1052 { 1053 struct net *net = cfg->rc_nlinfo.nl_net; 1054 unsigned index; 1055 int err = -EINVAL; 1056 1057 index = cfg->rc_label; 1058 1059 if (!mpls_label_ok(net, &index, extack)) 1060 goto errout; 1061 1062 mpls_route_update(net, index, NULL, &cfg->rc_nlinfo); 1063 1064 err = 0; 1065 errout: 1066 return err; 1067 } 1068 1069 static void mpls_get_stats(struct mpls_dev *mdev, 1070 struct mpls_link_stats *stats) 1071 { 1072 struct mpls_pcpu_stats *p; 1073 int i; 1074 1075 memset(stats, 0, sizeof(*stats)); 1076 1077 for_each_possible_cpu(i) { 1078 struct mpls_link_stats local; 1079 unsigned int start; 1080 1081 p = per_cpu_ptr(mdev->stats, i); 1082 do { 1083 start = u64_stats_fetch_begin(&p->syncp); 1084 local = p->stats; 1085 } while (u64_stats_fetch_retry(&p->syncp, start)); 1086 1087 stats->rx_packets += local.rx_packets; 1088 stats->rx_bytes += local.rx_bytes; 1089 stats->tx_packets += local.tx_packets; 1090 stats->tx_bytes += local.tx_bytes; 1091 stats->rx_errors += local.rx_errors; 1092 stats->tx_errors += local.tx_errors; 1093 stats->rx_dropped += local.rx_dropped; 1094 stats->tx_dropped += local.tx_dropped; 1095 stats->rx_noroute += local.rx_noroute; 1096 } 1097 } 1098 1099 static int mpls_fill_stats_af(struct sk_buff *skb, 1100 const struct net_device *dev) 1101 { 1102 struct mpls_link_stats *stats; 1103 struct mpls_dev *mdev; 1104 struct nlattr *nla; 1105 1106 mdev = mpls_dev_get(dev); 1107 if (!mdev) 1108 return -ENODATA; 1109 1110 nla = nla_reserve_64bit(skb, MPLS_STATS_LINK, 1111 sizeof(struct mpls_link_stats), 1112 MPLS_STATS_UNSPEC); 1113 if (!nla) 1114 return -EMSGSIZE; 1115 1116 stats = nla_data(nla); 1117 mpls_get_stats(mdev, stats); 1118 1119 return 0; 1120 } 1121 1122 static size_t mpls_get_stats_af_size(const struct net_device *dev) 1123 { 1124 struct mpls_dev *mdev; 1125 1126 mdev = mpls_dev_get(dev); 1127 if (!mdev) 1128 return 0; 1129 1130 return nla_total_size_64bit(sizeof(struct mpls_link_stats)); 1131 } 1132 1133 static int mpls_netconf_fill_devconf(struct sk_buff *skb, struct mpls_dev *mdev, 1134 u32 portid, u32 seq, int event, 1135 unsigned int flags, int type) 1136 { 1137 struct nlmsghdr *nlh; 1138 struct netconfmsg *ncm; 1139 bool all = false; 1140 1141 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 1142 flags); 1143 if (!nlh) 1144 return -EMSGSIZE; 1145 1146 if (type == NETCONFA_ALL) 1147 all = true; 1148 1149 ncm = nlmsg_data(nlh); 1150 ncm->ncm_family = AF_MPLS; 1151 1152 if (nla_put_s32(skb, NETCONFA_IFINDEX, mdev->dev->ifindex) < 0) 1153 goto nla_put_failure; 1154 1155 if ((all || type == NETCONFA_INPUT) && 1156 nla_put_s32(skb, NETCONFA_INPUT, 1157 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_sz(net, path, table, 1423 ARRAY_SIZE(mpls_dev_table)); 1424 if (!mdev->sysctl) 1425 goto free; 1426 1427 mpls_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, mdev); 1428 return 0; 1429 1430 free: 1431 kfree(table); 1432 out: 1433 mdev->sysctl = NULL; 1434 return -ENOBUFS; 1435 } 1436 1437 static void mpls_dev_sysctl_unregister(struct net_device *dev, 1438 struct mpls_dev *mdev) 1439 { 1440 struct net *net = dev_net(dev); 1441 struct ctl_table *table; 1442 1443 if (!mdev->sysctl) 1444 return; 1445 1446 table = mdev->sysctl->ctl_table_arg; 1447 unregister_net_sysctl_table(mdev->sysctl); 1448 kfree(table); 1449 1450 mpls_netconf_notify_devconf(net, RTM_DELNETCONF, 0, mdev); 1451 } 1452 1453 static struct mpls_dev *mpls_add_dev(struct net_device *dev) 1454 { 1455 struct mpls_dev *mdev; 1456 int err = -ENOMEM; 1457 int i; 1458 1459 ASSERT_RTNL(); 1460 1461 mdev = kzalloc(sizeof(*mdev), GFP_KERNEL); 1462 if (!mdev) 1463 return ERR_PTR(err); 1464 1465 mdev->stats = alloc_percpu(struct mpls_pcpu_stats); 1466 if (!mdev->stats) 1467 goto free; 1468 1469 for_each_possible_cpu(i) { 1470 struct mpls_pcpu_stats *mpls_stats; 1471 1472 mpls_stats = per_cpu_ptr(mdev->stats, i); 1473 u64_stats_init(&mpls_stats->syncp); 1474 } 1475 1476 mdev->dev = dev; 1477 1478 err = mpls_dev_sysctl_register(dev, mdev); 1479 if (err) 1480 goto free; 1481 1482 rcu_assign_pointer(dev->mpls_ptr, mdev); 1483 1484 return mdev; 1485 1486 free: 1487 free_percpu(mdev->stats); 1488 kfree(mdev); 1489 return ERR_PTR(err); 1490 } 1491 1492 static void mpls_dev_destroy_rcu(struct rcu_head *head) 1493 { 1494 struct mpls_dev *mdev = container_of(head, struct mpls_dev, rcu); 1495 1496 free_percpu(mdev->stats); 1497 kfree(mdev); 1498 } 1499 1500 static int mpls_ifdown(struct net_device *dev, int event) 1501 { 1502 struct mpls_route __rcu **platform_label; 1503 struct net *net = dev_net(dev); 1504 unsigned index; 1505 1506 platform_label = rtnl_dereference(net->mpls.platform_label); 1507 for (index = 0; index < net->mpls.platform_labels; index++) { 1508 struct mpls_route *rt = rtnl_dereference(platform_label[index]); 1509 bool nh_del = false; 1510 u8 alive = 0; 1511 1512 if (!rt) 1513 continue; 1514 1515 if (event == NETDEV_UNREGISTER) { 1516 u8 deleted = 0; 1517 1518 for_nexthops(rt) { 1519 if (!nh->nh_dev || nh->nh_dev == dev) 1520 deleted++; 1521 if (nh->nh_dev == dev) 1522 nh_del = true; 1523 } endfor_nexthops(rt); 1524 1525 /* if there are no more nexthops, delete the route */ 1526 if (deleted == rt->rt_nhn) { 1527 mpls_route_update(net, index, NULL, NULL); 1528 continue; 1529 } 1530 1531 if (nh_del) { 1532 size_t size = sizeof(*rt) + rt->rt_nhn * 1533 rt->rt_nh_size; 1534 struct mpls_route *orig = rt; 1535 1536 rt = kmemdup(orig, size, GFP_KERNEL); 1537 if (!rt) 1538 return -ENOMEM; 1539 } 1540 } 1541 1542 change_nexthops(rt) { 1543 unsigned int nh_flags = nh->nh_flags; 1544 1545 if (nh->nh_dev != dev) 1546 goto next; 1547 1548 switch (event) { 1549 case NETDEV_DOWN: 1550 case NETDEV_UNREGISTER: 1551 nh_flags |= RTNH_F_DEAD; 1552 fallthrough; 1553 case NETDEV_CHANGE: 1554 nh_flags |= RTNH_F_LINKDOWN; 1555 break; 1556 } 1557 if (event == NETDEV_UNREGISTER) 1558 nh->nh_dev = NULL; 1559 1560 if (nh->nh_flags != nh_flags) 1561 WRITE_ONCE(nh->nh_flags, nh_flags); 1562 next: 1563 if (!(nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN))) 1564 alive++; 1565 } endfor_nexthops(rt); 1566 1567 WRITE_ONCE(rt->rt_nhn_alive, alive); 1568 1569 if (nh_del) 1570 mpls_route_update(net, index, rt, NULL); 1571 } 1572 1573 return 0; 1574 } 1575 1576 static void mpls_ifup(struct net_device *dev, unsigned int flags) 1577 { 1578 struct mpls_route __rcu **platform_label; 1579 struct net *net = dev_net(dev); 1580 unsigned index; 1581 u8 alive; 1582 1583 platform_label = rtnl_dereference(net->mpls.platform_label); 1584 for (index = 0; index < net->mpls.platform_labels; index++) { 1585 struct mpls_route *rt = rtnl_dereference(platform_label[index]); 1586 1587 if (!rt) 1588 continue; 1589 1590 alive = 0; 1591 change_nexthops(rt) { 1592 unsigned int nh_flags = nh->nh_flags; 1593 1594 if (!(nh_flags & flags)) { 1595 alive++; 1596 continue; 1597 } 1598 if (nh->nh_dev != dev) 1599 continue; 1600 alive++; 1601 nh_flags &= ~flags; 1602 WRITE_ONCE(nh->nh_flags, nh_flags); 1603 } endfor_nexthops(rt); 1604 1605 WRITE_ONCE(rt->rt_nhn_alive, alive); 1606 } 1607 } 1608 1609 static int mpls_dev_notify(struct notifier_block *this, unsigned long event, 1610 void *ptr) 1611 { 1612 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1613 struct mpls_dev *mdev; 1614 unsigned int flags; 1615 int err; 1616 1617 if (event == NETDEV_REGISTER) { 1618 mdev = mpls_add_dev(dev); 1619 if (IS_ERR(mdev)) 1620 return notifier_from_errno(PTR_ERR(mdev)); 1621 1622 return NOTIFY_OK; 1623 } 1624 1625 mdev = mpls_dev_get(dev); 1626 if (!mdev) 1627 return NOTIFY_OK; 1628 1629 switch (event) { 1630 1631 case NETDEV_DOWN: 1632 err = mpls_ifdown(dev, event); 1633 if (err) 1634 return notifier_from_errno(err); 1635 break; 1636 case NETDEV_UP: 1637 flags = dev_get_flags(dev); 1638 if (flags & (IFF_RUNNING | IFF_LOWER_UP)) 1639 mpls_ifup(dev, RTNH_F_DEAD | RTNH_F_LINKDOWN); 1640 else 1641 mpls_ifup(dev, RTNH_F_DEAD); 1642 break; 1643 case NETDEV_CHANGE: 1644 flags = dev_get_flags(dev); 1645 if (flags & (IFF_RUNNING | IFF_LOWER_UP)) { 1646 mpls_ifup(dev, RTNH_F_DEAD | RTNH_F_LINKDOWN); 1647 } else { 1648 err = mpls_ifdown(dev, event); 1649 if (err) 1650 return notifier_from_errno(err); 1651 } 1652 break; 1653 case NETDEV_UNREGISTER: 1654 err = mpls_ifdown(dev, event); 1655 if (err) 1656 return notifier_from_errno(err); 1657 mdev = mpls_dev_get(dev); 1658 if (mdev) { 1659 mpls_dev_sysctl_unregister(dev, mdev); 1660 RCU_INIT_POINTER(dev->mpls_ptr, NULL); 1661 call_rcu(&mdev->rcu, mpls_dev_destroy_rcu); 1662 } 1663 break; 1664 case NETDEV_CHANGENAME: 1665 mdev = mpls_dev_get(dev); 1666 if (mdev) { 1667 mpls_dev_sysctl_unregister(dev, mdev); 1668 err = mpls_dev_sysctl_register(dev, mdev); 1669 if (err) 1670 return notifier_from_errno(err); 1671 } 1672 break; 1673 } 1674 return NOTIFY_OK; 1675 } 1676 1677 static struct notifier_block mpls_dev_notifier = { 1678 .notifier_call = mpls_dev_notify, 1679 }; 1680 1681 static int nla_put_via(struct sk_buff *skb, 1682 u8 table, const void *addr, int alen) 1683 { 1684 static const int table_to_family[NEIGH_NR_TABLES + 1] = { 1685 AF_INET, AF_INET6, AF_DECnet, AF_PACKET, 1686 }; 1687 struct nlattr *nla; 1688 struct rtvia *via; 1689 int family = AF_UNSPEC; 1690 1691 nla = nla_reserve(skb, RTA_VIA, alen + 2); 1692 if (!nla) 1693 return -EMSGSIZE; 1694 1695 if (table <= NEIGH_NR_TABLES) 1696 family = table_to_family[table]; 1697 1698 via = nla_data(nla); 1699 via->rtvia_family = family; 1700 memcpy(via->rtvia_addr, addr, alen); 1701 return 0; 1702 } 1703 1704 int nla_put_labels(struct sk_buff *skb, int attrtype, 1705 u8 labels, const u32 label[]) 1706 { 1707 struct nlattr *nla; 1708 struct mpls_shim_hdr *nla_label; 1709 bool bos; 1710 int i; 1711 nla = nla_reserve(skb, attrtype, labels*4); 1712 if (!nla) 1713 return -EMSGSIZE; 1714 1715 nla_label = nla_data(nla); 1716 bos = true; 1717 for (i = labels - 1; i >= 0; i--) { 1718 nla_label[i] = mpls_entry_encode(label[i], 0, 0, bos); 1719 bos = false; 1720 } 1721 1722 return 0; 1723 } 1724 EXPORT_SYMBOL_GPL(nla_put_labels); 1725 1726 int nla_get_labels(const struct nlattr *nla, u8 max_labels, u8 *labels, 1727 u32 label[], struct netlink_ext_ack *extack) 1728 { 1729 unsigned len = nla_len(nla); 1730 struct mpls_shim_hdr *nla_label; 1731 u8 nla_labels; 1732 bool bos; 1733 int i; 1734 1735 /* len needs to be an even multiple of 4 (the label size). Number 1736 * of labels is a u8 so check for overflow. 1737 */ 1738 if (len & 3 || len / 4 > 255) { 1739 NL_SET_ERR_MSG_ATTR(extack, nla, 1740 "Invalid length for labels attribute"); 1741 return -EINVAL; 1742 } 1743 1744 /* Limit the number of new labels allowed */ 1745 nla_labels = len/4; 1746 if (nla_labels > max_labels) { 1747 NL_SET_ERR_MSG(extack, "Too many labels"); 1748 return -EINVAL; 1749 } 1750 1751 /* when label == NULL, caller wants number of labels */ 1752 if (!label) 1753 goto out; 1754 1755 nla_label = nla_data(nla); 1756 bos = true; 1757 for (i = nla_labels - 1; i >= 0; i--, bos = false) { 1758 struct mpls_entry_decoded dec; 1759 dec = mpls_entry_decode(nla_label + i); 1760 1761 /* Ensure the bottom of stack flag is properly set 1762 * and ttl and tc are both clear. 1763 */ 1764 if (dec.ttl) { 1765 NL_SET_ERR_MSG_ATTR(extack, nla, 1766 "TTL in label must be 0"); 1767 return -EINVAL; 1768 } 1769 1770 if (dec.tc) { 1771 NL_SET_ERR_MSG_ATTR(extack, nla, 1772 "Traffic class in label must be 0"); 1773 return -EINVAL; 1774 } 1775 1776 if (dec.bos != bos) { 1777 NL_SET_BAD_ATTR(extack, nla); 1778 if (bos) { 1779 NL_SET_ERR_MSG(extack, 1780 "BOS bit must be set in first label"); 1781 } else { 1782 NL_SET_ERR_MSG(extack, 1783 "BOS bit can only be set in first label"); 1784 } 1785 return -EINVAL; 1786 } 1787 1788 switch (dec.label) { 1789 case MPLS_LABEL_IMPLNULL: 1790 /* RFC3032: This is a label that an LSR may 1791 * assign and distribute, but which never 1792 * actually appears in the encapsulation. 1793 */ 1794 NL_SET_ERR_MSG_ATTR(extack, nla, 1795 "Implicit NULL Label (3) can not be used in encapsulation"); 1796 return -EINVAL; 1797 } 1798 1799 label[i] = dec.label; 1800 } 1801 out: 1802 *labels = nla_labels; 1803 return 0; 1804 } 1805 EXPORT_SYMBOL_GPL(nla_get_labels); 1806 1807 static int rtm_to_route_config(struct sk_buff *skb, 1808 struct nlmsghdr *nlh, 1809 struct mpls_route_config *cfg, 1810 struct netlink_ext_ack *extack) 1811 { 1812 struct rtmsg *rtm; 1813 struct nlattr *tb[RTA_MAX+1]; 1814 int index; 1815 int err; 1816 1817 err = nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX, 1818 rtm_mpls_policy, extack); 1819 if (err < 0) 1820 goto errout; 1821 1822 err = -EINVAL; 1823 rtm = nlmsg_data(nlh); 1824 1825 if (rtm->rtm_family != AF_MPLS) { 1826 NL_SET_ERR_MSG(extack, "Invalid address family in rtmsg"); 1827 goto errout; 1828 } 1829 if (rtm->rtm_dst_len != 20) { 1830 NL_SET_ERR_MSG(extack, "rtm_dst_len must be 20 for MPLS"); 1831 goto errout; 1832 } 1833 if (rtm->rtm_src_len != 0) { 1834 NL_SET_ERR_MSG(extack, "rtm_src_len must be 0 for MPLS"); 1835 goto errout; 1836 } 1837 if (rtm->rtm_tos != 0) { 1838 NL_SET_ERR_MSG(extack, "rtm_tos must be 0 for MPLS"); 1839 goto errout; 1840 } 1841 if (rtm->rtm_table != RT_TABLE_MAIN) { 1842 NL_SET_ERR_MSG(extack, 1843 "MPLS only supports the main route table"); 1844 goto errout; 1845 } 1846 /* Any value is acceptable for rtm_protocol */ 1847 1848 /* As mpls uses destination specific addresses 1849 * (or source specific address in the case of multicast) 1850 * all addresses have universal scope. 1851 */ 1852 if (rtm->rtm_scope != RT_SCOPE_UNIVERSE) { 1853 NL_SET_ERR_MSG(extack, 1854 "Invalid route scope - MPLS only supports UNIVERSE"); 1855 goto errout; 1856 } 1857 if (rtm->rtm_type != RTN_UNICAST) { 1858 NL_SET_ERR_MSG(extack, 1859 "Invalid route type - MPLS only supports UNICAST"); 1860 goto errout; 1861 } 1862 if (rtm->rtm_flags != 0) { 1863 NL_SET_ERR_MSG(extack, "rtm_flags must be 0 for MPLS"); 1864 goto errout; 1865 } 1866 1867 cfg->rc_label = LABEL_NOT_SPECIFIED; 1868 cfg->rc_protocol = rtm->rtm_protocol; 1869 cfg->rc_via_table = MPLS_NEIGH_TABLE_UNSPEC; 1870 cfg->rc_ttl_propagate = MPLS_TTL_PROP_DEFAULT; 1871 cfg->rc_nlflags = nlh->nlmsg_flags; 1872 cfg->rc_nlinfo.portid = NETLINK_CB(skb).portid; 1873 cfg->rc_nlinfo.nlh = nlh; 1874 cfg->rc_nlinfo.nl_net = sock_net(skb->sk); 1875 1876 for (index = 0; index <= RTA_MAX; index++) { 1877 struct nlattr *nla = tb[index]; 1878 if (!nla) 1879 continue; 1880 1881 switch (index) { 1882 case RTA_OIF: 1883 cfg->rc_ifindex = nla_get_u32(nla); 1884 break; 1885 case RTA_NEWDST: 1886 if (nla_get_labels(nla, MAX_NEW_LABELS, 1887 &cfg->rc_output_labels, 1888 cfg->rc_output_label, extack)) 1889 goto errout; 1890 break; 1891 case RTA_DST: 1892 { 1893 u8 label_count; 1894 if (nla_get_labels(nla, 1, &label_count, 1895 &cfg->rc_label, extack)) 1896 goto errout; 1897 1898 if (!mpls_label_ok(cfg->rc_nlinfo.nl_net, 1899 &cfg->rc_label, extack)) 1900 goto errout; 1901 break; 1902 } 1903 case RTA_GATEWAY: 1904 NL_SET_ERR_MSG(extack, "MPLS does not support RTA_GATEWAY attribute"); 1905 goto errout; 1906 case RTA_VIA: 1907 { 1908 if (nla_get_via(nla, &cfg->rc_via_alen, 1909 &cfg->rc_via_table, cfg->rc_via, 1910 extack)) 1911 goto errout; 1912 break; 1913 } 1914 case RTA_MULTIPATH: 1915 { 1916 cfg->rc_mp = nla_data(nla); 1917 cfg->rc_mp_len = nla_len(nla); 1918 break; 1919 } 1920 case RTA_TTL_PROPAGATE: 1921 { 1922 u8 ttl_propagate = nla_get_u8(nla); 1923 1924 if (ttl_propagate > 1) { 1925 NL_SET_ERR_MSG_ATTR(extack, nla, 1926 "RTA_TTL_PROPAGATE can only be 0 or 1"); 1927 goto errout; 1928 } 1929 cfg->rc_ttl_propagate = ttl_propagate ? 1930 MPLS_TTL_PROP_ENABLED : 1931 MPLS_TTL_PROP_DISABLED; 1932 break; 1933 } 1934 default: 1935 NL_SET_ERR_MSG_ATTR(extack, nla, "Unknown attribute"); 1936 /* Unsupported attribute */ 1937 goto errout; 1938 } 1939 } 1940 1941 err = 0; 1942 errout: 1943 return err; 1944 } 1945 1946 static int mpls_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, 1947 struct netlink_ext_ack *extack) 1948 { 1949 struct mpls_route_config *cfg; 1950 int err; 1951 1952 cfg = kzalloc(sizeof(*cfg), GFP_KERNEL); 1953 if (!cfg) 1954 return -ENOMEM; 1955 1956 err = rtm_to_route_config(skb, nlh, cfg, extack); 1957 if (err < 0) 1958 goto out; 1959 1960 err = mpls_route_del(cfg, extack); 1961 out: 1962 kfree(cfg); 1963 1964 return err; 1965 } 1966 1967 1968 static int mpls_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, 1969 struct netlink_ext_ack *extack) 1970 { 1971 struct mpls_route_config *cfg; 1972 int err; 1973 1974 cfg = kzalloc(sizeof(*cfg), GFP_KERNEL); 1975 if (!cfg) 1976 return -ENOMEM; 1977 1978 err = rtm_to_route_config(skb, nlh, cfg, extack); 1979 if (err < 0) 1980 goto out; 1981 1982 err = mpls_route_add(cfg, extack); 1983 out: 1984 kfree(cfg); 1985 1986 return err; 1987 } 1988 1989 static int mpls_dump_route(struct sk_buff *skb, u32 portid, u32 seq, int event, 1990 u32 label, struct mpls_route *rt, int flags) 1991 { 1992 struct net_device *dev; 1993 struct nlmsghdr *nlh; 1994 struct rtmsg *rtm; 1995 1996 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*rtm), flags); 1997 if (nlh == NULL) 1998 return -EMSGSIZE; 1999 2000 rtm = nlmsg_data(nlh); 2001 rtm->rtm_family = AF_MPLS; 2002 rtm->rtm_dst_len = 20; 2003 rtm->rtm_src_len = 0; 2004 rtm->rtm_tos = 0; 2005 rtm->rtm_table = RT_TABLE_MAIN; 2006 rtm->rtm_protocol = rt->rt_protocol; 2007 rtm->rtm_scope = RT_SCOPE_UNIVERSE; 2008 rtm->rtm_type = RTN_UNICAST; 2009 rtm->rtm_flags = 0; 2010 2011 if (nla_put_labels(skb, RTA_DST, 1, &label)) 2012 goto nla_put_failure; 2013 2014 if (rt->rt_ttl_propagate != MPLS_TTL_PROP_DEFAULT) { 2015 bool ttl_propagate = 2016 rt->rt_ttl_propagate == MPLS_TTL_PROP_ENABLED; 2017 2018 if (nla_put_u8(skb, RTA_TTL_PROPAGATE, 2019 ttl_propagate)) 2020 goto nla_put_failure; 2021 } 2022 if (rt->rt_nhn == 1) { 2023 const struct mpls_nh *nh = rt->rt_nh; 2024 2025 if (nh->nh_labels && 2026 nla_put_labels(skb, RTA_NEWDST, nh->nh_labels, 2027 nh->nh_label)) 2028 goto nla_put_failure; 2029 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC && 2030 nla_put_via(skb, nh->nh_via_table, mpls_nh_via(rt, nh), 2031 nh->nh_via_alen)) 2032 goto nla_put_failure; 2033 dev = nh->nh_dev; 2034 if (dev && nla_put_u32(skb, RTA_OIF, dev->ifindex)) 2035 goto nla_put_failure; 2036 if (nh->nh_flags & RTNH_F_LINKDOWN) 2037 rtm->rtm_flags |= RTNH_F_LINKDOWN; 2038 if (nh->nh_flags & RTNH_F_DEAD) 2039 rtm->rtm_flags |= RTNH_F_DEAD; 2040 } else { 2041 struct rtnexthop *rtnh; 2042 struct nlattr *mp; 2043 u8 linkdown = 0; 2044 u8 dead = 0; 2045 2046 mp = nla_nest_start_noflag(skb, RTA_MULTIPATH); 2047 if (!mp) 2048 goto nla_put_failure; 2049 2050 for_nexthops(rt) { 2051 dev = nh->nh_dev; 2052 if (!dev) 2053 continue; 2054 2055 rtnh = nla_reserve_nohdr(skb, sizeof(*rtnh)); 2056 if (!rtnh) 2057 goto nla_put_failure; 2058 2059 rtnh->rtnh_ifindex = dev->ifindex; 2060 if (nh->nh_flags & RTNH_F_LINKDOWN) { 2061 rtnh->rtnh_flags |= RTNH_F_LINKDOWN; 2062 linkdown++; 2063 } 2064 if (nh->nh_flags & RTNH_F_DEAD) { 2065 rtnh->rtnh_flags |= RTNH_F_DEAD; 2066 dead++; 2067 } 2068 2069 if (nh->nh_labels && nla_put_labels(skb, RTA_NEWDST, 2070 nh->nh_labels, 2071 nh->nh_label)) 2072 goto nla_put_failure; 2073 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC && 2074 nla_put_via(skb, nh->nh_via_table, 2075 mpls_nh_via(rt, nh), 2076 nh->nh_via_alen)) 2077 goto nla_put_failure; 2078 2079 /* length of rtnetlink header + attributes */ 2080 rtnh->rtnh_len = nlmsg_get_pos(skb) - (void *)rtnh; 2081 } endfor_nexthops(rt); 2082 2083 if (linkdown == rt->rt_nhn) 2084 rtm->rtm_flags |= RTNH_F_LINKDOWN; 2085 if (dead == rt->rt_nhn) 2086 rtm->rtm_flags |= RTNH_F_DEAD; 2087 2088 nla_nest_end(skb, mp); 2089 } 2090 2091 nlmsg_end(skb, nlh); 2092 return 0; 2093 2094 nla_put_failure: 2095 nlmsg_cancel(skb, nlh); 2096 return -EMSGSIZE; 2097 } 2098 2099 #if IS_ENABLED(CONFIG_INET) 2100 static int mpls_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh, 2101 struct fib_dump_filter *filter, 2102 struct netlink_callback *cb) 2103 { 2104 return ip_valid_fib_dump_req(net, nlh, filter, cb); 2105 } 2106 #else 2107 static int mpls_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh, 2108 struct fib_dump_filter *filter, 2109 struct netlink_callback *cb) 2110 { 2111 struct netlink_ext_ack *extack = cb->extack; 2112 struct nlattr *tb[RTA_MAX + 1]; 2113 struct rtmsg *rtm; 2114 int err, i; 2115 2116 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) { 2117 NL_SET_ERR_MSG_MOD(extack, "Invalid header for FIB dump request"); 2118 return -EINVAL; 2119 } 2120 2121 rtm = nlmsg_data(nlh); 2122 if (rtm->rtm_dst_len || rtm->rtm_src_len || rtm->rtm_tos || 2123 rtm->rtm_table || rtm->rtm_scope || rtm->rtm_type || 2124 rtm->rtm_flags) { 2125 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for FIB dump request"); 2126 return -EINVAL; 2127 } 2128 2129 if (rtm->rtm_protocol) { 2130 filter->protocol = rtm->rtm_protocol; 2131 filter->filter_set = 1; 2132 cb->answer_flags = NLM_F_DUMP_FILTERED; 2133 } 2134 2135 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX, 2136 rtm_mpls_policy, extack); 2137 if (err < 0) 2138 return err; 2139 2140 for (i = 0; i <= RTA_MAX; ++i) { 2141 int ifindex; 2142 2143 if (i == RTA_OIF) { 2144 ifindex = nla_get_u32(tb[i]); 2145 filter->dev = __dev_get_by_index(net, ifindex); 2146 if (!filter->dev) 2147 return -ENODEV; 2148 filter->filter_set = 1; 2149 } else if (tb[i]) { 2150 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request"); 2151 return -EINVAL; 2152 } 2153 } 2154 2155 return 0; 2156 } 2157 #endif 2158 2159 static bool mpls_rt_uses_dev(struct mpls_route *rt, 2160 const struct net_device *dev) 2161 { 2162 if (rt->rt_nhn == 1) { 2163 struct mpls_nh *nh = rt->rt_nh; 2164 2165 if (nh->nh_dev == dev) 2166 return true; 2167 } else { 2168 for_nexthops(rt) { 2169 if (nh->nh_dev == dev) 2170 return true; 2171 } endfor_nexthops(rt); 2172 } 2173 2174 return false; 2175 } 2176 2177 static int mpls_dump_routes(struct sk_buff *skb, struct netlink_callback *cb) 2178 { 2179 const struct nlmsghdr *nlh = cb->nlh; 2180 struct net *net = sock_net(skb->sk); 2181 struct mpls_route __rcu **platform_label; 2182 struct fib_dump_filter filter = {}; 2183 unsigned int flags = NLM_F_MULTI; 2184 size_t platform_labels; 2185 unsigned int index; 2186 2187 ASSERT_RTNL(); 2188 2189 if (cb->strict_check) { 2190 int err; 2191 2192 err = mpls_valid_fib_dump_req(net, nlh, &filter, cb); 2193 if (err < 0) 2194 return err; 2195 2196 /* for MPLS, there is only 1 table with fixed type and flags. 2197 * If either are set in the filter then return nothing. 2198 */ 2199 if ((filter.table_id && filter.table_id != RT_TABLE_MAIN) || 2200 (filter.rt_type && filter.rt_type != RTN_UNICAST) || 2201 filter.flags) 2202 return skb->len; 2203 } 2204 2205 index = cb->args[0]; 2206 if (index < MPLS_LABEL_FIRST_UNRESERVED) 2207 index = MPLS_LABEL_FIRST_UNRESERVED; 2208 2209 platform_label = rtnl_dereference(net->mpls.platform_label); 2210 platform_labels = net->mpls.platform_labels; 2211 2212 if (filter.filter_set) 2213 flags |= NLM_F_DUMP_FILTERED; 2214 2215 for (; index < platform_labels; index++) { 2216 struct mpls_route *rt; 2217 2218 rt = rtnl_dereference(platform_label[index]); 2219 if (!rt) 2220 continue; 2221 2222 if ((filter.dev && !mpls_rt_uses_dev(rt, filter.dev)) || 2223 (filter.protocol && rt->rt_protocol != filter.protocol)) 2224 continue; 2225 2226 if (mpls_dump_route(skb, NETLINK_CB(cb->skb).portid, 2227 cb->nlh->nlmsg_seq, RTM_NEWROUTE, 2228 index, rt, flags) < 0) 2229 break; 2230 } 2231 cb->args[0] = index; 2232 2233 return skb->len; 2234 } 2235 2236 static inline size_t lfib_nlmsg_size(struct mpls_route *rt) 2237 { 2238 size_t payload = 2239 NLMSG_ALIGN(sizeof(struct rtmsg)) 2240 + nla_total_size(4) /* RTA_DST */ 2241 + nla_total_size(1); /* RTA_TTL_PROPAGATE */ 2242 2243 if (rt->rt_nhn == 1) { 2244 struct mpls_nh *nh = rt->rt_nh; 2245 2246 if (nh->nh_dev) 2247 payload += nla_total_size(4); /* RTA_OIF */ 2248 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC) /* RTA_VIA */ 2249 payload += nla_total_size(2 + nh->nh_via_alen); 2250 if (nh->nh_labels) /* RTA_NEWDST */ 2251 payload += nla_total_size(nh->nh_labels * 4); 2252 } else { 2253 /* each nexthop is packed in an attribute */ 2254 size_t nhsize = 0; 2255 2256 for_nexthops(rt) { 2257 if (!nh->nh_dev) 2258 continue; 2259 nhsize += nla_total_size(sizeof(struct rtnexthop)); 2260 /* RTA_VIA */ 2261 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC) 2262 nhsize += nla_total_size(2 + nh->nh_via_alen); 2263 if (nh->nh_labels) 2264 nhsize += nla_total_size(nh->nh_labels * 4); 2265 } endfor_nexthops(rt); 2266 /* nested attribute */ 2267 payload += nla_total_size(nhsize); 2268 } 2269 2270 return payload; 2271 } 2272 2273 static void rtmsg_lfib(int event, u32 label, struct mpls_route *rt, 2274 struct nlmsghdr *nlh, struct net *net, u32 portid, 2275 unsigned int nlm_flags) 2276 { 2277 struct sk_buff *skb; 2278 u32 seq = nlh ? nlh->nlmsg_seq : 0; 2279 int err = -ENOBUFS; 2280 2281 skb = nlmsg_new(lfib_nlmsg_size(rt), GFP_KERNEL); 2282 if (skb == NULL) 2283 goto errout; 2284 2285 err = mpls_dump_route(skb, portid, seq, event, label, rt, nlm_flags); 2286 if (err < 0) { 2287 /* -EMSGSIZE implies BUG in lfib_nlmsg_size */ 2288 WARN_ON(err == -EMSGSIZE); 2289 kfree_skb(skb); 2290 goto errout; 2291 } 2292 rtnl_notify(skb, net, portid, RTNLGRP_MPLS_ROUTE, nlh, GFP_KERNEL); 2293 2294 return; 2295 errout: 2296 if (err < 0) 2297 rtnl_set_sk_err(net, RTNLGRP_MPLS_ROUTE, err); 2298 } 2299 2300 static int mpls_valid_getroute_req(struct sk_buff *skb, 2301 const struct nlmsghdr *nlh, 2302 struct nlattr **tb, 2303 struct netlink_ext_ack *extack) 2304 { 2305 struct rtmsg *rtm; 2306 int i, err; 2307 2308 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) { 2309 NL_SET_ERR_MSG_MOD(extack, 2310 "Invalid header for get route request"); 2311 return -EINVAL; 2312 } 2313 2314 if (!netlink_strict_get_check(skb)) 2315 return nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX, 2316 rtm_mpls_policy, extack); 2317 2318 rtm = nlmsg_data(nlh); 2319 if ((rtm->rtm_dst_len && rtm->rtm_dst_len != 20) || 2320 rtm->rtm_src_len || rtm->rtm_tos || rtm->rtm_table || 2321 rtm->rtm_protocol || rtm->rtm_scope || rtm->rtm_type) { 2322 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get route request"); 2323 return -EINVAL; 2324 } 2325 if (rtm->rtm_flags & ~RTM_F_FIB_MATCH) { 2326 NL_SET_ERR_MSG_MOD(extack, 2327 "Invalid flags for get route request"); 2328 return -EINVAL; 2329 } 2330 2331 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX, 2332 rtm_mpls_policy, extack); 2333 if (err) 2334 return err; 2335 2336 if ((tb[RTA_DST] || tb[RTA_NEWDST]) && !rtm->rtm_dst_len) { 2337 NL_SET_ERR_MSG_MOD(extack, "rtm_dst_len must be 20 for MPLS"); 2338 return -EINVAL; 2339 } 2340 2341 for (i = 0; i <= RTA_MAX; i++) { 2342 if (!tb[i]) 2343 continue; 2344 2345 switch (i) { 2346 case RTA_DST: 2347 case RTA_NEWDST: 2348 break; 2349 default: 2350 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get route request"); 2351 return -EINVAL; 2352 } 2353 } 2354 2355 return 0; 2356 } 2357 2358 static int mpls_getroute(struct sk_buff *in_skb, struct nlmsghdr *in_nlh, 2359 struct netlink_ext_ack *extack) 2360 { 2361 struct net *net = sock_net(in_skb->sk); 2362 u32 portid = NETLINK_CB(in_skb).portid; 2363 u32 in_label = LABEL_NOT_SPECIFIED; 2364 struct nlattr *tb[RTA_MAX + 1]; 2365 u32 labels[MAX_NEW_LABELS]; 2366 struct mpls_shim_hdr *hdr; 2367 unsigned int hdr_size = 0; 2368 const struct mpls_nh *nh; 2369 struct net_device *dev; 2370 struct mpls_route *rt; 2371 struct rtmsg *rtm, *r; 2372 struct nlmsghdr *nlh; 2373 struct sk_buff *skb; 2374 u8 n_labels; 2375 int err; 2376 2377 err = mpls_valid_getroute_req(in_skb, in_nlh, tb, extack); 2378 if (err < 0) 2379 goto errout; 2380 2381 rtm = nlmsg_data(in_nlh); 2382 2383 if (tb[RTA_DST]) { 2384 u8 label_count; 2385 2386 if (nla_get_labels(tb[RTA_DST], 1, &label_count, 2387 &in_label, extack)) { 2388 err = -EINVAL; 2389 goto errout; 2390 } 2391 2392 if (!mpls_label_ok(net, &in_label, extack)) { 2393 err = -EINVAL; 2394 goto errout; 2395 } 2396 } 2397 2398 rt = mpls_route_input_rcu(net, in_label); 2399 if (!rt) { 2400 err = -ENETUNREACH; 2401 goto errout; 2402 } 2403 2404 if (rtm->rtm_flags & RTM_F_FIB_MATCH) { 2405 skb = nlmsg_new(lfib_nlmsg_size(rt), GFP_KERNEL); 2406 if (!skb) { 2407 err = -ENOBUFS; 2408 goto errout; 2409 } 2410 2411 err = mpls_dump_route(skb, portid, in_nlh->nlmsg_seq, 2412 RTM_NEWROUTE, in_label, rt, 0); 2413 if (err < 0) { 2414 /* -EMSGSIZE implies BUG in lfib_nlmsg_size */ 2415 WARN_ON(err == -EMSGSIZE); 2416 goto errout_free; 2417 } 2418 2419 return rtnl_unicast(skb, net, portid); 2420 } 2421 2422 if (tb[RTA_NEWDST]) { 2423 if (nla_get_labels(tb[RTA_NEWDST], MAX_NEW_LABELS, &n_labels, 2424 labels, extack) != 0) { 2425 err = -EINVAL; 2426 goto errout; 2427 } 2428 2429 hdr_size = n_labels * sizeof(struct mpls_shim_hdr); 2430 } 2431 2432 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); 2433 if (!skb) { 2434 err = -ENOBUFS; 2435 goto errout; 2436 } 2437 2438 skb->protocol = htons(ETH_P_MPLS_UC); 2439 2440 if (hdr_size) { 2441 bool bos; 2442 int i; 2443 2444 if (skb_cow(skb, hdr_size)) { 2445 err = -ENOBUFS; 2446 goto errout_free; 2447 } 2448 2449 skb_reserve(skb, hdr_size); 2450 skb_push(skb, hdr_size); 2451 skb_reset_network_header(skb); 2452 2453 /* Push new labels */ 2454 hdr = mpls_hdr(skb); 2455 bos = true; 2456 for (i = n_labels - 1; i >= 0; i--) { 2457 hdr[i] = mpls_entry_encode(labels[i], 2458 1, 0, bos); 2459 bos = false; 2460 } 2461 } 2462 2463 nh = mpls_select_multipath(rt, skb); 2464 if (!nh) { 2465 err = -ENETUNREACH; 2466 goto errout_free; 2467 } 2468 2469 if (hdr_size) { 2470 skb_pull(skb, hdr_size); 2471 skb_reset_network_header(skb); 2472 } 2473 2474 nlh = nlmsg_put(skb, portid, in_nlh->nlmsg_seq, 2475 RTM_NEWROUTE, sizeof(*r), 0); 2476 if (!nlh) { 2477 err = -EMSGSIZE; 2478 goto errout_free; 2479 } 2480 2481 r = nlmsg_data(nlh); 2482 r->rtm_family = AF_MPLS; 2483 r->rtm_dst_len = 20; 2484 r->rtm_src_len = 0; 2485 r->rtm_table = RT_TABLE_MAIN; 2486 r->rtm_type = RTN_UNICAST; 2487 r->rtm_scope = RT_SCOPE_UNIVERSE; 2488 r->rtm_protocol = rt->rt_protocol; 2489 r->rtm_flags = 0; 2490 2491 if (nla_put_labels(skb, RTA_DST, 1, &in_label)) 2492 goto nla_put_failure; 2493 2494 if (nh->nh_labels && 2495 nla_put_labels(skb, RTA_NEWDST, nh->nh_labels, 2496 nh->nh_label)) 2497 goto nla_put_failure; 2498 2499 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC && 2500 nla_put_via(skb, nh->nh_via_table, mpls_nh_via(rt, nh), 2501 nh->nh_via_alen)) 2502 goto nla_put_failure; 2503 dev = nh->nh_dev; 2504 if (dev && nla_put_u32(skb, RTA_OIF, dev->ifindex)) 2505 goto nla_put_failure; 2506 2507 nlmsg_end(skb, nlh); 2508 2509 err = rtnl_unicast(skb, net, portid); 2510 errout: 2511 return err; 2512 2513 nla_put_failure: 2514 nlmsg_cancel(skb, nlh); 2515 err = -EMSGSIZE; 2516 errout_free: 2517 kfree_skb(skb); 2518 return err; 2519 } 2520 2521 static int resize_platform_label_table(struct net *net, size_t limit) 2522 { 2523 size_t size = sizeof(struct mpls_route *) * limit; 2524 size_t old_limit; 2525 size_t cp_size; 2526 struct mpls_route __rcu **labels = NULL, **old; 2527 struct mpls_route *rt0 = NULL, *rt2 = NULL; 2528 unsigned index; 2529 2530 if (size) { 2531 labels = kvzalloc(size, GFP_KERNEL); 2532 if (!labels) 2533 goto nolabels; 2534 } 2535 2536 /* In case the predefined labels need to be populated */ 2537 if (limit > MPLS_LABEL_IPV4NULL) { 2538 struct net_device *lo = net->loopback_dev; 2539 rt0 = mpls_rt_alloc(1, lo->addr_len, 0); 2540 if (IS_ERR(rt0)) 2541 goto nort0; 2542 rt0->rt_nh->nh_dev = lo; 2543 rt0->rt_protocol = RTPROT_KERNEL; 2544 rt0->rt_payload_type = MPT_IPV4; 2545 rt0->rt_ttl_propagate = MPLS_TTL_PROP_DEFAULT; 2546 rt0->rt_nh->nh_via_table = NEIGH_LINK_TABLE; 2547 rt0->rt_nh->nh_via_alen = lo->addr_len; 2548 memcpy(__mpls_nh_via(rt0, rt0->rt_nh), lo->dev_addr, 2549 lo->addr_len); 2550 } 2551 if (limit > MPLS_LABEL_IPV6NULL) { 2552 struct net_device *lo = net->loopback_dev; 2553 rt2 = mpls_rt_alloc(1, lo->addr_len, 0); 2554 if (IS_ERR(rt2)) 2555 goto nort2; 2556 rt2->rt_nh->nh_dev = lo; 2557 rt2->rt_protocol = RTPROT_KERNEL; 2558 rt2->rt_payload_type = MPT_IPV6; 2559 rt2->rt_ttl_propagate = MPLS_TTL_PROP_DEFAULT; 2560 rt2->rt_nh->nh_via_table = NEIGH_LINK_TABLE; 2561 rt2->rt_nh->nh_via_alen = lo->addr_len; 2562 memcpy(__mpls_nh_via(rt2, rt2->rt_nh), lo->dev_addr, 2563 lo->addr_len); 2564 } 2565 2566 rtnl_lock(); 2567 /* Remember the original table */ 2568 old = rtnl_dereference(net->mpls.platform_label); 2569 old_limit = net->mpls.platform_labels; 2570 2571 /* Free any labels beyond the new table */ 2572 for (index = limit; index < old_limit; index++) 2573 mpls_route_update(net, index, NULL, NULL); 2574 2575 /* Copy over the old labels */ 2576 cp_size = size; 2577 if (old_limit < limit) 2578 cp_size = old_limit * sizeof(struct mpls_route *); 2579 2580 memcpy(labels, old, cp_size); 2581 2582 /* If needed set the predefined labels */ 2583 if ((old_limit <= MPLS_LABEL_IPV6NULL) && 2584 (limit > MPLS_LABEL_IPV6NULL)) { 2585 RCU_INIT_POINTER(labels[MPLS_LABEL_IPV6NULL], rt2); 2586 rt2 = NULL; 2587 } 2588 2589 if ((old_limit <= MPLS_LABEL_IPV4NULL) && 2590 (limit > MPLS_LABEL_IPV4NULL)) { 2591 RCU_INIT_POINTER(labels[MPLS_LABEL_IPV4NULL], rt0); 2592 rt0 = NULL; 2593 } 2594 2595 /* Update the global pointers */ 2596 net->mpls.platform_labels = limit; 2597 rcu_assign_pointer(net->mpls.platform_label, labels); 2598 2599 rtnl_unlock(); 2600 2601 mpls_rt_free(rt2); 2602 mpls_rt_free(rt0); 2603 2604 if (old) { 2605 synchronize_rcu(); 2606 kvfree(old); 2607 } 2608 return 0; 2609 2610 nort2: 2611 mpls_rt_free(rt0); 2612 nort0: 2613 kvfree(labels); 2614 nolabels: 2615 return -ENOMEM; 2616 } 2617 2618 static int mpls_platform_labels(struct ctl_table *table, int write, 2619 void *buffer, size_t *lenp, loff_t *ppos) 2620 { 2621 struct net *net = table->data; 2622 int platform_labels = net->mpls.platform_labels; 2623 int ret; 2624 struct ctl_table tmp = { 2625 .procname = table->procname, 2626 .data = &platform_labels, 2627 .maxlen = sizeof(int), 2628 .mode = table->mode, 2629 .extra1 = SYSCTL_ZERO, 2630 .extra2 = &label_limit, 2631 }; 2632 2633 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); 2634 2635 if (write && ret == 0) 2636 ret = resize_platform_label_table(net, platform_labels); 2637 2638 return ret; 2639 } 2640 2641 #define MPLS_NS_SYSCTL_OFFSET(field) \ 2642 (&((struct net *)0)->field) 2643 2644 static const struct ctl_table mpls_table[] = { 2645 { 2646 .procname = "platform_labels", 2647 .data = NULL, 2648 .maxlen = sizeof(int), 2649 .mode = 0644, 2650 .proc_handler = mpls_platform_labels, 2651 }, 2652 { 2653 .procname = "ip_ttl_propagate", 2654 .data = MPLS_NS_SYSCTL_OFFSET(mpls.ip_ttl_propagate), 2655 .maxlen = sizeof(int), 2656 .mode = 0644, 2657 .proc_handler = proc_dointvec_minmax, 2658 .extra1 = SYSCTL_ZERO, 2659 .extra2 = SYSCTL_ONE, 2660 }, 2661 { 2662 .procname = "default_ttl", 2663 .data = MPLS_NS_SYSCTL_OFFSET(mpls.default_ttl), 2664 .maxlen = sizeof(int), 2665 .mode = 0644, 2666 .proc_handler = proc_dointvec_minmax, 2667 .extra1 = SYSCTL_ONE, 2668 .extra2 = &ttl_max, 2669 }, 2670 { } 2671 }; 2672 2673 static int mpls_net_init(struct net *net) 2674 { 2675 struct ctl_table *table; 2676 int i; 2677 2678 net->mpls.platform_labels = 0; 2679 net->mpls.platform_label = NULL; 2680 net->mpls.ip_ttl_propagate = 1; 2681 net->mpls.default_ttl = 255; 2682 2683 table = kmemdup(mpls_table, sizeof(mpls_table), GFP_KERNEL); 2684 if (table == NULL) 2685 return -ENOMEM; 2686 2687 /* Table data contains only offsets relative to the base of 2688 * the mdev at this point, so make them absolute. 2689 */ 2690 for (i = 0; i < ARRAY_SIZE(mpls_table) - 1; i++) 2691 table[i].data = (char *)net + (uintptr_t)table[i].data; 2692 2693 net->mpls.ctl = register_net_sysctl_sz(net, "net/mpls", table, 2694 ARRAY_SIZE(mpls_table)); 2695 if (net->mpls.ctl == NULL) { 2696 kfree(table); 2697 return -ENOMEM; 2698 } 2699 2700 return 0; 2701 } 2702 2703 static void mpls_net_exit(struct net *net) 2704 { 2705 struct mpls_route __rcu **platform_label; 2706 size_t platform_labels; 2707 struct ctl_table *table; 2708 unsigned int index; 2709 2710 table = net->mpls.ctl->ctl_table_arg; 2711 unregister_net_sysctl_table(net->mpls.ctl); 2712 kfree(table); 2713 2714 /* An rcu grace period has passed since there was a device in 2715 * the network namespace (and thus the last in flight packet) 2716 * left this network namespace. This is because 2717 * unregister_netdevice_many and netdev_run_todo has completed 2718 * for each network device that was in this network namespace. 2719 * 2720 * As such no additional rcu synchronization is necessary when 2721 * freeing the platform_label table. 2722 */ 2723 rtnl_lock(); 2724 platform_label = rtnl_dereference(net->mpls.platform_label); 2725 platform_labels = net->mpls.platform_labels; 2726 for (index = 0; index < platform_labels; index++) { 2727 struct mpls_route *rt = rtnl_dereference(platform_label[index]); 2728 RCU_INIT_POINTER(platform_label[index], NULL); 2729 mpls_notify_route(net, index, rt, NULL, NULL); 2730 mpls_rt_free(rt); 2731 } 2732 rtnl_unlock(); 2733 2734 kvfree(platform_label); 2735 } 2736 2737 static struct pernet_operations mpls_net_ops = { 2738 .init = mpls_net_init, 2739 .exit = mpls_net_exit, 2740 }; 2741 2742 static struct rtnl_af_ops mpls_af_ops __read_mostly = { 2743 .family = AF_MPLS, 2744 .fill_stats_af = mpls_fill_stats_af, 2745 .get_stats_af_size = mpls_get_stats_af_size, 2746 }; 2747 2748 static int __init mpls_init(void) 2749 { 2750 int err; 2751 2752 BUILD_BUG_ON(sizeof(struct mpls_shim_hdr) != 4); 2753 2754 err = register_pernet_subsys(&mpls_net_ops); 2755 if (err) 2756 goto out; 2757 2758 err = register_netdevice_notifier(&mpls_dev_notifier); 2759 if (err) 2760 goto out_unregister_pernet; 2761 2762 dev_add_pack(&mpls_packet_type); 2763 2764 rtnl_af_register(&mpls_af_ops); 2765 2766 rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_NEWROUTE, 2767 mpls_rtm_newroute, NULL, 0); 2768 rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_DELROUTE, 2769 mpls_rtm_delroute, NULL, 0); 2770 rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_GETROUTE, 2771 mpls_getroute, mpls_dump_routes, 0); 2772 rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_GETNETCONF, 2773 mpls_netconf_get_devconf, 2774 mpls_netconf_dump_devconf, 0); 2775 err = ipgre_tunnel_encap_add_mpls_ops(); 2776 if (err) 2777 pr_err("Can't add mpls over gre tunnel ops\n"); 2778 2779 err = 0; 2780 out: 2781 return err; 2782 2783 out_unregister_pernet: 2784 unregister_pernet_subsys(&mpls_net_ops); 2785 goto out; 2786 } 2787 module_init(mpls_init); 2788 2789 static void __exit mpls_exit(void) 2790 { 2791 rtnl_unregister_all(PF_MPLS); 2792 rtnl_af_unregister(&mpls_af_ops); 2793 dev_remove_pack(&mpls_packet_type); 2794 unregister_netdevice_notifier(&mpls_dev_notifier); 2795 unregister_pernet_subsys(&mpls_net_ops); 2796 ipgre_tunnel_encap_del_mpls_ops(); 2797 } 2798 module_exit(mpls_exit); 2799 2800 MODULE_DESCRIPTION("MultiProtocol Label Switching"); 2801 MODULE_LICENSE("GPL v2"); 2802 MODULE_ALIAS_NETPROTO(PF_MPLS); 2803