1 // SPDX-License-Identifier: GPL-2.0-only 2 #include <linux/types.h> 3 #include <linux/skbuff.h> 4 #include <linux/socket.h> 5 #include <linux/sysctl.h> 6 #include <linux/net.h> 7 #include <linux/module.h> 8 #include <linux/if_arp.h> 9 #include <linux/ipv6.h> 10 #include <linux/mpls.h> 11 #include <linux/netconf.h> 12 #include <linux/nospec.h> 13 #include <linux/vmalloc.h> 14 #include <linux/percpu.h> 15 #include <net/gso.h> 16 #include <net/ip.h> 17 #include <net/dst.h> 18 #include <net/sock.h> 19 #include <net/arp.h> 20 #include <net/ip_fib.h> 21 #include <net/netevent.h> 22 #include <net/ip_tunnels.h> 23 #include <net/netns/generic.h> 24 #if IS_ENABLED(CONFIG_IPV6) 25 #include <net/ipv6.h> 26 #endif 27 #include <net/ipv6_stubs.h> 28 #include <net/rtnh.h> 29 #include "internal.h" 30 31 /* max memory we will use for mpls_route */ 32 #define MAX_MPLS_ROUTE_MEM 4096 33 34 /* Maximum number of labels to look ahead at when selecting a path of 35 * a multipath route 36 */ 37 #define MAX_MP_SELECT_LABELS 4 38 39 #define MPLS_NEIGH_TABLE_UNSPEC (NEIGH_LINK_TABLE + 1) 40 41 static int label_limit = (1 << 20) - 1; 42 static int ttl_max = 255; 43 44 #if IS_ENABLED(CONFIG_NET_IP_TUNNEL) 45 static size_t ipgre_mpls_encap_hlen(struct ip_tunnel_encap *e) 46 { 47 return sizeof(struct mpls_shim_hdr); 48 } 49 50 static const struct ip_tunnel_encap_ops mpls_iptun_ops = { 51 .encap_hlen = ipgre_mpls_encap_hlen, 52 }; 53 54 static int ipgre_tunnel_encap_add_mpls_ops(void) 55 { 56 return ip_tunnel_encap_add_ops(&mpls_iptun_ops, TUNNEL_ENCAP_MPLS); 57 } 58 59 static void ipgre_tunnel_encap_del_mpls_ops(void) 60 { 61 ip_tunnel_encap_del_ops(&mpls_iptun_ops, TUNNEL_ENCAP_MPLS); 62 } 63 #else 64 static int ipgre_tunnel_encap_add_mpls_ops(void) 65 { 66 return 0; 67 } 68 69 static void ipgre_tunnel_encap_del_mpls_ops(void) 70 { 71 } 72 #endif 73 74 static void rtmsg_lfib(int event, u32 label, struct mpls_route *rt, 75 struct nlmsghdr *nlh, struct net *net, u32 portid, 76 unsigned int nlm_flags); 77 78 static struct mpls_route *mpls_route_input_rcu(struct net *net, unsigned index) 79 { 80 struct mpls_route *rt = NULL; 81 82 if (index < net->mpls.platform_labels) { 83 struct mpls_route __rcu **platform_label = 84 rcu_dereference(net->mpls.platform_label); 85 rt = rcu_dereference(platform_label[index]); 86 } 87 return rt; 88 } 89 90 bool mpls_output_possible(const struct net_device *dev) 91 { 92 return dev && (dev->flags & IFF_UP) && netif_carrier_ok(dev); 93 } 94 EXPORT_SYMBOL_GPL(mpls_output_possible); 95 96 static u8 *__mpls_nh_via(struct mpls_route *rt, struct mpls_nh *nh) 97 { 98 return (u8 *)nh + rt->rt_via_offset; 99 } 100 101 static const u8 *mpls_nh_via(const struct mpls_route *rt, 102 const struct mpls_nh *nh) 103 { 104 return __mpls_nh_via((struct mpls_route *)rt, (struct mpls_nh *)nh); 105 } 106 107 static unsigned int mpls_nh_header_size(const struct mpls_nh *nh) 108 { 109 /* The size of the layer 2.5 labels to be added for this route */ 110 return nh->nh_labels * sizeof(struct mpls_shim_hdr); 111 } 112 113 unsigned int mpls_dev_mtu(const struct net_device *dev) 114 { 115 /* The amount of data the layer 2 frame can hold */ 116 return dev->mtu; 117 } 118 EXPORT_SYMBOL_GPL(mpls_dev_mtu); 119 120 bool mpls_pkt_too_big(const struct sk_buff *skb, unsigned int mtu) 121 { 122 if (skb->len <= mtu) 123 return false; 124 125 if (skb_is_gso(skb) && skb_gso_validate_network_len(skb, mtu)) 126 return false; 127 128 return true; 129 } 130 EXPORT_SYMBOL_GPL(mpls_pkt_too_big); 131 132 void mpls_stats_inc_outucastpkts(struct net_device *dev, 133 const struct sk_buff *skb) 134 { 135 struct mpls_dev *mdev; 136 137 if (skb->protocol == htons(ETH_P_MPLS_UC)) { 138 mdev = mpls_dev_get(dev); 139 if (mdev) 140 MPLS_INC_STATS_LEN(mdev, skb->len, 141 tx_packets, 142 tx_bytes); 143 } else if (skb->protocol == htons(ETH_P_IP)) { 144 IP_UPD_PO_STATS(dev_net(dev), IPSTATS_MIB_OUT, skb->len); 145 #if IS_ENABLED(CONFIG_IPV6) 146 } else if (skb->protocol == htons(ETH_P_IPV6)) { 147 struct inet6_dev *in6dev = __in6_dev_get(dev); 148 149 if (in6dev) 150 IP6_UPD_PO_STATS(dev_net(dev), in6dev, 151 IPSTATS_MIB_OUT, skb->len); 152 #endif 153 } 154 } 155 EXPORT_SYMBOL_GPL(mpls_stats_inc_outucastpkts); 156 157 static u32 mpls_multipath_hash(struct mpls_route *rt, struct sk_buff *skb) 158 { 159 struct mpls_entry_decoded dec; 160 unsigned int mpls_hdr_len = 0; 161 struct mpls_shim_hdr *hdr; 162 bool eli_seen = false; 163 int label_index; 164 u32 hash = 0; 165 166 for (label_index = 0; label_index < MAX_MP_SELECT_LABELS; 167 label_index++) { 168 mpls_hdr_len += sizeof(*hdr); 169 if (!pskb_may_pull(skb, mpls_hdr_len)) 170 break; 171 172 /* Read and decode the current label */ 173 hdr = mpls_hdr(skb) + label_index; 174 dec = mpls_entry_decode(hdr); 175 176 /* RFC6790 - reserved labels MUST NOT be used as keys 177 * for the load-balancing function 178 */ 179 if (likely(dec.label >= MPLS_LABEL_FIRST_UNRESERVED)) { 180 hash = jhash_1word(dec.label, hash); 181 182 /* The entropy label follows the entropy label 183 * indicator, so this means that the entropy 184 * label was just added to the hash - no need to 185 * go any deeper either in the label stack or in the 186 * payload 187 */ 188 if (eli_seen) 189 break; 190 } else if (dec.label == MPLS_LABEL_ENTROPY) { 191 eli_seen = true; 192 } 193 194 if (!dec.bos) 195 continue; 196 197 /* found bottom label; does skb have room for a header? */ 198 if (pskb_may_pull(skb, mpls_hdr_len + sizeof(struct iphdr))) { 199 const struct iphdr *v4hdr; 200 201 v4hdr = (const struct iphdr *)(hdr + 1); 202 if (v4hdr->version == 4) { 203 hash = jhash_3words(ntohl(v4hdr->saddr), 204 ntohl(v4hdr->daddr), 205 v4hdr->protocol, hash); 206 } else if (v4hdr->version == 6 && 207 pskb_may_pull(skb, mpls_hdr_len + 208 sizeof(struct ipv6hdr))) { 209 const struct ipv6hdr *v6hdr; 210 211 v6hdr = (const struct ipv6hdr *)(hdr + 1); 212 hash = __ipv6_addr_jhash(&v6hdr->saddr, hash); 213 hash = __ipv6_addr_jhash(&v6hdr->daddr, hash); 214 hash = jhash_1word(v6hdr->nexthdr, hash); 215 } 216 } 217 218 break; 219 } 220 221 return hash; 222 } 223 224 static struct mpls_nh *mpls_get_nexthop(struct mpls_route *rt, u8 index) 225 { 226 return (struct mpls_nh *)((u8 *)rt->rt_nh + index * rt->rt_nh_size); 227 } 228 229 /* number of alive nexthops (rt->rt_nhn_alive) and the flags for 230 * a next hop (nh->nh_flags) are modified by netdev event handlers. 231 * Since those fields can change at any moment, use READ_ONCE to 232 * access both. 233 */ 234 static const struct mpls_nh *mpls_select_multipath(struct mpls_route *rt, 235 struct sk_buff *skb) 236 { 237 u32 hash = 0; 238 int nh_index = 0; 239 int n = 0; 240 u8 alive; 241 242 /* No need to look further into packet if there's only 243 * one path 244 */ 245 if (rt->rt_nhn == 1) 246 return rt->rt_nh; 247 248 alive = READ_ONCE(rt->rt_nhn_alive); 249 if (alive == 0) 250 return NULL; 251 252 hash = mpls_multipath_hash(rt, skb); 253 nh_index = hash % alive; 254 if (alive == rt->rt_nhn) 255 goto out; 256 for_nexthops(rt) { 257 unsigned int nh_flags = READ_ONCE(nh->nh_flags); 258 259 if (nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)) 260 continue; 261 if (n == nh_index) 262 return nh; 263 n++; 264 } endfor_nexthops(rt); 265 266 out: 267 return mpls_get_nexthop(rt, nh_index); 268 } 269 270 static bool mpls_egress(struct net *net, struct mpls_route *rt, 271 struct sk_buff *skb, struct mpls_entry_decoded dec) 272 { 273 enum mpls_payload_type payload_type; 274 bool success = false; 275 276 /* The IPv4 code below accesses through the IPv4 header 277 * checksum, which is 12 bytes into the packet. 278 * The IPv6 code below accesses through the IPv6 hop limit 279 * which is 8 bytes into the packet. 280 * 281 * For all supported cases there should always be at least 12 282 * bytes of packet data present. The IPv4 header is 20 bytes 283 * without options and the IPv6 header is always 40 bytes 284 * long. 285 */ 286 if (!pskb_may_pull(skb, 12)) 287 return false; 288 289 payload_type = rt->rt_payload_type; 290 if (payload_type == MPT_UNSPEC) 291 payload_type = ip_hdr(skb)->version; 292 293 switch (payload_type) { 294 case MPT_IPV4: { 295 struct iphdr *hdr4 = ip_hdr(skb); 296 u8 new_ttl; 297 skb->protocol = htons(ETH_P_IP); 298 299 /* If propagating TTL, take the decremented TTL from 300 * the incoming MPLS header, otherwise decrement the 301 * TTL, but only if not 0 to avoid underflow. 302 */ 303 if (rt->rt_ttl_propagate == MPLS_TTL_PROP_ENABLED || 304 (rt->rt_ttl_propagate == MPLS_TTL_PROP_DEFAULT && 305 net->mpls.ip_ttl_propagate)) 306 new_ttl = dec.ttl; 307 else 308 new_ttl = hdr4->ttl ? hdr4->ttl - 1 : 0; 309 310 csum_replace2(&hdr4->check, 311 htons(hdr4->ttl << 8), 312 htons(new_ttl << 8)); 313 hdr4->ttl = new_ttl; 314 success = true; 315 break; 316 } 317 case MPT_IPV6: { 318 struct ipv6hdr *hdr6 = ipv6_hdr(skb); 319 skb->protocol = htons(ETH_P_IPV6); 320 321 /* If propagating TTL, take the decremented TTL from 322 * the incoming MPLS header, otherwise decrement the 323 * hop limit, but only if not 0 to avoid underflow. 324 */ 325 if (rt->rt_ttl_propagate == MPLS_TTL_PROP_ENABLED || 326 (rt->rt_ttl_propagate == MPLS_TTL_PROP_DEFAULT && 327 net->mpls.ip_ttl_propagate)) 328 hdr6->hop_limit = dec.ttl; 329 else if (hdr6->hop_limit) 330 hdr6->hop_limit = hdr6->hop_limit - 1; 331 success = true; 332 break; 333 } 334 case MPT_UNSPEC: 335 /* Should have decided which protocol it is by now */ 336 break; 337 } 338 339 return success; 340 } 341 342 static int mpls_forward(struct sk_buff *skb, struct net_device *dev, 343 struct packet_type *pt, struct net_device *orig_dev) 344 { 345 struct net *net = dev_net(dev); 346 struct mpls_shim_hdr *hdr; 347 const struct mpls_nh *nh; 348 struct mpls_route *rt; 349 struct mpls_entry_decoded dec; 350 struct net_device *out_dev; 351 struct mpls_dev *out_mdev; 352 struct mpls_dev *mdev; 353 unsigned int hh_len; 354 unsigned int new_header_size; 355 unsigned int mtu; 356 int err; 357 358 /* Careful this entire function runs inside of an rcu critical section */ 359 360 mdev = mpls_dev_get(dev); 361 if (!mdev) 362 goto drop; 363 364 MPLS_INC_STATS_LEN(mdev, skb->len, rx_packets, 365 rx_bytes); 366 367 if (!mdev->input_enabled) { 368 MPLS_INC_STATS(mdev, rx_dropped); 369 goto drop; 370 } 371 372 if (skb->pkt_type != PACKET_HOST) 373 goto err; 374 375 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) 376 goto err; 377 378 if (!pskb_may_pull(skb, sizeof(*hdr))) 379 goto err; 380 381 skb_dst_drop(skb); 382 383 /* Read and decode the label */ 384 hdr = mpls_hdr(skb); 385 dec = mpls_entry_decode(hdr); 386 387 rt = mpls_route_input_rcu(net, dec.label); 388 if (!rt) { 389 MPLS_INC_STATS(mdev, rx_noroute); 390 goto drop; 391 } 392 393 nh = mpls_select_multipath(rt, skb); 394 if (!nh) 395 goto err; 396 397 /* Pop the label */ 398 skb_pull(skb, sizeof(*hdr)); 399 skb_reset_network_header(skb); 400 401 skb_orphan(skb); 402 403 if (skb_warn_if_lro(skb)) 404 goto err; 405 406 skb_forward_csum(skb); 407 408 /* Verify ttl is valid */ 409 if (dec.ttl <= 1) 410 goto err; 411 412 /* Find the output device */ 413 out_dev = nh->nh_dev; 414 if (!mpls_output_possible(out_dev)) 415 goto tx_err; 416 417 /* Verify the destination can hold the packet */ 418 new_header_size = mpls_nh_header_size(nh); 419 mtu = mpls_dev_mtu(out_dev); 420 if (mpls_pkt_too_big(skb, mtu - new_header_size)) 421 goto tx_err; 422 423 hh_len = LL_RESERVED_SPACE(out_dev); 424 if (!out_dev->header_ops) 425 hh_len = 0; 426 427 /* Ensure there is enough space for the headers in the skb */ 428 if (skb_cow(skb, hh_len + new_header_size)) 429 goto tx_err; 430 431 skb->dev = out_dev; 432 skb->protocol = htons(ETH_P_MPLS_UC); 433 434 dec.ttl -= 1; 435 if (unlikely(!new_header_size && dec.bos)) { 436 /* Penultimate hop popping */ 437 if (!mpls_egress(dev_net(out_dev), rt, skb, dec)) 438 goto err; 439 } else { 440 bool bos; 441 int i; 442 skb_push(skb, new_header_size); 443 skb_reset_network_header(skb); 444 /* Push the new labels */ 445 hdr = mpls_hdr(skb); 446 bos = dec.bos; 447 for (i = nh->nh_labels - 1; i >= 0; i--) { 448 hdr[i] = mpls_entry_encode(nh->nh_label[i], 449 dec.ttl, 0, bos); 450 bos = false; 451 } 452 } 453 454 mpls_stats_inc_outucastpkts(out_dev, skb); 455 456 /* If via wasn't specified then send out using device address */ 457 if (nh->nh_via_table == MPLS_NEIGH_TABLE_UNSPEC) 458 err = neigh_xmit(NEIGH_LINK_TABLE, out_dev, 459 out_dev->dev_addr, skb); 460 else 461 err = neigh_xmit(nh->nh_via_table, out_dev, 462 mpls_nh_via(rt, nh), skb); 463 if (err) 464 net_dbg_ratelimited("%s: packet transmission failed: %d\n", 465 __func__, err); 466 return 0; 467 468 tx_err: 469 out_mdev = out_dev ? mpls_dev_get(out_dev) : NULL; 470 if (out_mdev) 471 MPLS_INC_STATS(out_mdev, tx_errors); 472 goto drop; 473 err: 474 MPLS_INC_STATS(mdev, rx_errors); 475 drop: 476 kfree_skb(skb); 477 return NET_RX_DROP; 478 } 479 480 static struct packet_type mpls_packet_type __read_mostly = { 481 .type = cpu_to_be16(ETH_P_MPLS_UC), 482 .func = mpls_forward, 483 }; 484 485 static const struct nla_policy rtm_mpls_policy[RTA_MAX+1] = { 486 [RTA_DST] = { .type = NLA_U32 }, 487 [RTA_OIF] = { .type = NLA_U32 }, 488 [RTA_TTL_PROPAGATE] = { .type = NLA_U8 }, 489 }; 490 491 struct mpls_route_config { 492 u32 rc_protocol; 493 u32 rc_ifindex; 494 u8 rc_via_table; 495 u8 rc_via_alen; 496 u8 rc_via[MAX_VIA_ALEN]; 497 u32 rc_label; 498 u8 rc_ttl_propagate; 499 u8 rc_output_labels; 500 u32 rc_output_label[MAX_NEW_LABELS]; 501 u32 rc_nlflags; 502 enum mpls_payload_type rc_payload_type; 503 struct nl_info rc_nlinfo; 504 struct rtnexthop *rc_mp; 505 int rc_mp_len; 506 }; 507 508 /* all nexthops within a route have the same size based on max 509 * number of labels and max via length for a hop 510 */ 511 static struct mpls_route *mpls_rt_alloc(u8 num_nh, u8 max_alen, u8 max_labels) 512 { 513 u8 nh_size = MPLS_NH_SIZE(max_labels, max_alen); 514 struct mpls_route *rt; 515 size_t size; 516 517 size = sizeof(*rt) + num_nh * nh_size; 518 if (size > MAX_MPLS_ROUTE_MEM) 519 return ERR_PTR(-EINVAL); 520 521 rt = kzalloc(size, GFP_KERNEL); 522 if (!rt) 523 return ERR_PTR(-ENOMEM); 524 525 rt->rt_nhn = num_nh; 526 rt->rt_nhn_alive = num_nh; 527 rt->rt_nh_size = nh_size; 528 rt->rt_via_offset = MPLS_NH_VIA_OFF(max_labels); 529 530 return rt; 531 } 532 533 static void mpls_rt_free(struct mpls_route *rt) 534 { 535 if (rt) 536 kfree_rcu(rt, rt_rcu); 537 } 538 539 static void mpls_notify_route(struct net *net, unsigned index, 540 struct mpls_route *old, struct mpls_route *new, 541 const struct nl_info *info) 542 { 543 struct nlmsghdr *nlh = info ? info->nlh : NULL; 544 unsigned portid = info ? info->portid : 0; 545 int event = new ? RTM_NEWROUTE : RTM_DELROUTE; 546 struct mpls_route *rt = new ? new : old; 547 unsigned nlm_flags = (old && new) ? NLM_F_REPLACE : 0; 548 /* Ignore reserved labels for now */ 549 if (rt && (index >= MPLS_LABEL_FIRST_UNRESERVED)) 550 rtmsg_lfib(event, index, rt, nlh, net, portid, nlm_flags); 551 } 552 553 static void mpls_route_update(struct net *net, unsigned index, 554 struct mpls_route *new, 555 const struct nl_info *info) 556 { 557 struct mpls_route __rcu **platform_label; 558 struct mpls_route *rt; 559 560 ASSERT_RTNL(); 561 562 platform_label = rtnl_dereference(net->mpls.platform_label); 563 rt = rtnl_dereference(platform_label[index]); 564 rcu_assign_pointer(platform_label[index], new); 565 566 mpls_notify_route(net, index, rt, new, info); 567 568 /* If we removed a route free it now */ 569 mpls_rt_free(rt); 570 } 571 572 static unsigned find_free_label(struct net *net) 573 { 574 struct mpls_route __rcu **platform_label; 575 size_t platform_labels; 576 unsigned index; 577 578 platform_label = rtnl_dereference(net->mpls.platform_label); 579 platform_labels = net->mpls.platform_labels; 580 for (index = MPLS_LABEL_FIRST_UNRESERVED; index < platform_labels; 581 index++) { 582 if (!rtnl_dereference(platform_label[index])) 583 return index; 584 } 585 return LABEL_NOT_SPECIFIED; 586 } 587 588 #if IS_ENABLED(CONFIG_INET) 589 static struct net_device *inet_fib_lookup_dev(struct net *net, 590 const void *addr) 591 { 592 struct net_device *dev; 593 struct rtable *rt; 594 struct in_addr daddr; 595 596 memcpy(&daddr, addr, sizeof(struct in_addr)); 597 rt = ip_route_output(net, daddr.s_addr, 0, 0, 0, RT_SCOPE_UNIVERSE); 598 if (IS_ERR(rt)) 599 return ERR_CAST(rt); 600 601 dev = rt->dst.dev; 602 dev_hold(dev); 603 604 ip_rt_put(rt); 605 606 return dev; 607 } 608 #else 609 static struct net_device *inet_fib_lookup_dev(struct net *net, 610 const void *addr) 611 { 612 return ERR_PTR(-EAFNOSUPPORT); 613 } 614 #endif 615 616 #if IS_ENABLED(CONFIG_IPV6) 617 static struct net_device *inet6_fib_lookup_dev(struct net *net, 618 const void *addr) 619 { 620 struct net_device *dev; 621 struct dst_entry *dst; 622 struct flowi6 fl6; 623 624 if (!ipv6_stub) 625 return ERR_PTR(-EAFNOSUPPORT); 626 627 memset(&fl6, 0, sizeof(fl6)); 628 memcpy(&fl6.daddr, addr, sizeof(struct in6_addr)); 629 dst = ipv6_stub->ipv6_dst_lookup_flow(net, NULL, &fl6, NULL); 630 if (IS_ERR(dst)) 631 return ERR_CAST(dst); 632 633 dev = dst->dev; 634 dev_hold(dev); 635 dst_release(dst); 636 637 return dev; 638 } 639 #else 640 static struct net_device *inet6_fib_lookup_dev(struct net *net, 641 const void *addr) 642 { 643 return ERR_PTR(-EAFNOSUPPORT); 644 } 645 #endif 646 647 static struct net_device *find_outdev(struct net *net, 648 struct mpls_route *rt, 649 struct mpls_nh *nh, int oif) 650 { 651 struct net_device *dev = NULL; 652 653 if (!oif) { 654 switch (nh->nh_via_table) { 655 case NEIGH_ARP_TABLE: 656 dev = inet_fib_lookup_dev(net, mpls_nh_via(rt, nh)); 657 break; 658 case NEIGH_ND_TABLE: 659 dev = inet6_fib_lookup_dev(net, mpls_nh_via(rt, nh)); 660 break; 661 case NEIGH_LINK_TABLE: 662 break; 663 } 664 } else { 665 dev = dev_get_by_index(net, oif); 666 } 667 668 if (!dev) 669 return ERR_PTR(-ENODEV); 670 671 if (IS_ERR(dev)) 672 return dev; 673 674 /* The caller is holding rtnl anyways, so release the dev reference */ 675 dev_put(dev); 676 677 return dev; 678 } 679 680 static int mpls_nh_assign_dev(struct net *net, struct mpls_route *rt, 681 struct mpls_nh *nh, int oif) 682 { 683 struct net_device *dev = NULL; 684 int err = -ENODEV; 685 686 dev = find_outdev(net, rt, nh, oif); 687 if (IS_ERR(dev)) { 688 err = PTR_ERR(dev); 689 dev = NULL; 690 goto errout; 691 } 692 693 /* Ensure this is a supported device */ 694 err = -EINVAL; 695 if (!mpls_dev_get(dev)) 696 goto errout; 697 698 if ((nh->nh_via_table == NEIGH_LINK_TABLE) && 699 (dev->addr_len != nh->nh_via_alen)) 700 goto errout; 701 702 nh->nh_dev = dev; 703 704 if (!(dev->flags & IFF_UP)) { 705 nh->nh_flags |= RTNH_F_DEAD; 706 } else { 707 unsigned int flags; 708 709 flags = dev_get_flags(dev); 710 if (!(flags & (IFF_RUNNING | IFF_LOWER_UP))) 711 nh->nh_flags |= RTNH_F_LINKDOWN; 712 } 713 714 return 0; 715 716 errout: 717 return err; 718 } 719 720 static int nla_get_via(const struct nlattr *nla, u8 *via_alen, u8 *via_table, 721 u8 via_addr[], struct netlink_ext_ack *extack) 722 { 723 struct rtvia *via = nla_data(nla); 724 int err = -EINVAL; 725 int alen; 726 727 if (nla_len(nla) < offsetof(struct rtvia, rtvia_addr)) { 728 NL_SET_ERR_MSG_ATTR(extack, nla, 729 "Invalid attribute length for RTA_VIA"); 730 goto errout; 731 } 732 alen = nla_len(nla) - 733 offsetof(struct rtvia, rtvia_addr); 734 if (alen > MAX_VIA_ALEN) { 735 NL_SET_ERR_MSG_ATTR(extack, nla, 736 "Invalid address length for RTA_VIA"); 737 goto errout; 738 } 739 740 /* Validate the address family */ 741 switch (via->rtvia_family) { 742 case AF_PACKET: 743 *via_table = NEIGH_LINK_TABLE; 744 break; 745 case AF_INET: 746 *via_table = NEIGH_ARP_TABLE; 747 if (alen != 4) 748 goto errout; 749 break; 750 case AF_INET6: 751 *via_table = NEIGH_ND_TABLE; 752 if (alen != 16) 753 goto errout; 754 break; 755 default: 756 /* Unsupported address family */ 757 goto errout; 758 } 759 760 memcpy(via_addr, via->rtvia_addr, alen); 761 *via_alen = alen; 762 err = 0; 763 764 errout: 765 return err; 766 } 767 768 static int mpls_nh_build_from_cfg(struct mpls_route_config *cfg, 769 struct mpls_route *rt) 770 { 771 struct net *net = cfg->rc_nlinfo.nl_net; 772 struct mpls_nh *nh = rt->rt_nh; 773 int err; 774 int i; 775 776 if (!nh) 777 return -ENOMEM; 778 779 nh->nh_labels = cfg->rc_output_labels; 780 for (i = 0; i < nh->nh_labels; i++) 781 nh->nh_label[i] = cfg->rc_output_label[i]; 782 783 nh->nh_via_table = cfg->rc_via_table; 784 memcpy(__mpls_nh_via(rt, nh), cfg->rc_via, cfg->rc_via_alen); 785 nh->nh_via_alen = cfg->rc_via_alen; 786 787 err = mpls_nh_assign_dev(net, rt, nh, cfg->rc_ifindex); 788 if (err) 789 goto errout; 790 791 if (nh->nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)) 792 rt->rt_nhn_alive--; 793 794 return 0; 795 796 errout: 797 return err; 798 } 799 800 static int mpls_nh_build(struct net *net, struct mpls_route *rt, 801 struct mpls_nh *nh, int oif, struct nlattr *via, 802 struct nlattr *newdst, u8 max_labels, 803 struct netlink_ext_ack *extack) 804 { 805 int err = -ENOMEM; 806 807 if (!nh) 808 goto errout; 809 810 if (newdst) { 811 err = nla_get_labels(newdst, max_labels, &nh->nh_labels, 812 nh->nh_label, extack); 813 if (err) 814 goto errout; 815 } 816 817 if (via) { 818 err = nla_get_via(via, &nh->nh_via_alen, &nh->nh_via_table, 819 __mpls_nh_via(rt, nh), extack); 820 if (err) 821 goto errout; 822 } else { 823 nh->nh_via_table = MPLS_NEIGH_TABLE_UNSPEC; 824 } 825 826 err = mpls_nh_assign_dev(net, rt, nh, oif); 827 if (err) 828 goto errout; 829 830 return 0; 831 832 errout: 833 return err; 834 } 835 836 static u8 mpls_count_nexthops(struct rtnexthop *rtnh, int len, 837 u8 cfg_via_alen, u8 *max_via_alen, 838 u8 *max_labels) 839 { 840 int remaining = len; 841 u8 nhs = 0; 842 843 *max_via_alen = 0; 844 *max_labels = 0; 845 846 while (rtnh_ok(rtnh, remaining)) { 847 struct nlattr *nla, *attrs = rtnh_attrs(rtnh); 848 int attrlen; 849 u8 n_labels = 0; 850 851 attrlen = rtnh_attrlen(rtnh); 852 nla = nla_find(attrs, attrlen, RTA_VIA); 853 if (nla && nla_len(nla) >= 854 offsetof(struct rtvia, rtvia_addr)) { 855 int via_alen = nla_len(nla) - 856 offsetof(struct rtvia, rtvia_addr); 857 858 if (via_alen <= MAX_VIA_ALEN) 859 *max_via_alen = max_t(u16, *max_via_alen, 860 via_alen); 861 } 862 863 nla = nla_find(attrs, attrlen, RTA_NEWDST); 864 if (nla && 865 nla_get_labels(nla, MAX_NEW_LABELS, &n_labels, 866 NULL, NULL) != 0) 867 return 0; 868 869 *max_labels = max_t(u8, *max_labels, n_labels); 870 871 /* number of nexthops is tracked by a u8. 872 * Check for overflow. 873 */ 874 if (nhs == 255) 875 return 0; 876 nhs++; 877 878 rtnh = rtnh_next(rtnh, &remaining); 879 } 880 881 /* leftover implies invalid nexthop configuration, discard it */ 882 return remaining > 0 ? 0 : nhs; 883 } 884 885 static int mpls_nh_build_multi(struct mpls_route_config *cfg, 886 struct mpls_route *rt, u8 max_labels, 887 struct netlink_ext_ack *extack) 888 { 889 struct rtnexthop *rtnh = cfg->rc_mp; 890 struct nlattr *nla_via, *nla_newdst; 891 int remaining = cfg->rc_mp_len; 892 int err = 0; 893 u8 nhs = 0; 894 895 change_nexthops(rt) { 896 int attrlen; 897 898 nla_via = NULL; 899 nla_newdst = NULL; 900 901 err = -EINVAL; 902 if (!rtnh_ok(rtnh, remaining)) 903 goto errout; 904 905 /* neither weighted multipath nor any flags 906 * are supported 907 */ 908 if (rtnh->rtnh_hops || rtnh->rtnh_flags) 909 goto errout; 910 911 attrlen = rtnh_attrlen(rtnh); 912 if (attrlen > 0) { 913 struct nlattr *attrs = rtnh_attrs(rtnh); 914 915 nla_via = nla_find(attrs, attrlen, RTA_VIA); 916 nla_newdst = nla_find(attrs, attrlen, RTA_NEWDST); 917 } 918 919 err = mpls_nh_build(cfg->rc_nlinfo.nl_net, rt, nh, 920 rtnh->rtnh_ifindex, nla_via, nla_newdst, 921 max_labels, extack); 922 if (err) 923 goto errout; 924 925 if (nh->nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)) 926 rt->rt_nhn_alive--; 927 928 rtnh = rtnh_next(rtnh, &remaining); 929 nhs++; 930 } endfor_nexthops(rt); 931 932 rt->rt_nhn = nhs; 933 934 return 0; 935 936 errout: 937 return err; 938 } 939 940 static bool mpls_label_ok(struct net *net, unsigned int *index, 941 struct netlink_ext_ack *extack) 942 { 943 bool is_ok = true; 944 945 /* Reserved labels may not be set */ 946 if (*index < MPLS_LABEL_FIRST_UNRESERVED) { 947 NL_SET_ERR_MSG(extack, 948 "Invalid label - must be MPLS_LABEL_FIRST_UNRESERVED or higher"); 949 is_ok = false; 950 } 951 952 /* The full 20 bit range may not be supported. */ 953 if (is_ok && *index >= net->mpls.platform_labels) { 954 NL_SET_ERR_MSG(extack, 955 "Label >= configured maximum in platform_labels"); 956 is_ok = false; 957 } 958 959 *index = array_index_nospec(*index, net->mpls.platform_labels); 960 return is_ok; 961 } 962 963 static int mpls_route_add(struct mpls_route_config *cfg, 964 struct netlink_ext_ack *extack) 965 { 966 struct mpls_route __rcu **platform_label; 967 struct net *net = cfg->rc_nlinfo.nl_net; 968 struct mpls_route *rt, *old; 969 int err = -EINVAL; 970 u8 max_via_alen; 971 unsigned index; 972 u8 max_labels; 973 u8 nhs; 974 975 index = cfg->rc_label; 976 977 /* If a label was not specified during insert pick one */ 978 if ((index == LABEL_NOT_SPECIFIED) && 979 (cfg->rc_nlflags & NLM_F_CREATE)) { 980 index = find_free_label(net); 981 } 982 983 if (!mpls_label_ok(net, &index, extack)) 984 goto errout; 985 986 /* Append makes no sense with mpls */ 987 err = -EOPNOTSUPP; 988 if (cfg->rc_nlflags & NLM_F_APPEND) { 989 NL_SET_ERR_MSG(extack, "MPLS does not support route append"); 990 goto errout; 991 } 992 993 err = -EEXIST; 994 platform_label = rtnl_dereference(net->mpls.platform_label); 995 old = rtnl_dereference(platform_label[index]); 996 if ((cfg->rc_nlflags & NLM_F_EXCL) && old) 997 goto errout; 998 999 err = -EEXIST; 1000 if (!(cfg->rc_nlflags & NLM_F_REPLACE) && old) 1001 goto errout; 1002 1003 err = -ENOENT; 1004 if (!(cfg->rc_nlflags & NLM_F_CREATE) && !old) 1005 goto errout; 1006 1007 err = -EINVAL; 1008 if (cfg->rc_mp) { 1009 nhs = mpls_count_nexthops(cfg->rc_mp, cfg->rc_mp_len, 1010 cfg->rc_via_alen, &max_via_alen, 1011 &max_labels); 1012 } else { 1013 max_via_alen = cfg->rc_via_alen; 1014 max_labels = cfg->rc_output_labels; 1015 nhs = 1; 1016 } 1017 1018 if (nhs == 0) { 1019 NL_SET_ERR_MSG(extack, "Route does not contain a nexthop"); 1020 goto errout; 1021 } 1022 1023 rt = mpls_rt_alloc(nhs, max_via_alen, max_labels); 1024 if (IS_ERR(rt)) { 1025 err = PTR_ERR(rt); 1026 goto errout; 1027 } 1028 1029 rt->rt_protocol = cfg->rc_protocol; 1030 rt->rt_payload_type = cfg->rc_payload_type; 1031 rt->rt_ttl_propagate = cfg->rc_ttl_propagate; 1032 1033 if (cfg->rc_mp) 1034 err = mpls_nh_build_multi(cfg, rt, max_labels, extack); 1035 else 1036 err = mpls_nh_build_from_cfg(cfg, rt); 1037 if (err) 1038 goto freert; 1039 1040 mpls_route_update(net, index, rt, &cfg->rc_nlinfo); 1041 1042 return 0; 1043 1044 freert: 1045 mpls_rt_free(rt); 1046 errout: 1047 return err; 1048 } 1049 1050 static int mpls_route_del(struct mpls_route_config *cfg, 1051 struct netlink_ext_ack *extack) 1052 { 1053 struct net *net = cfg->rc_nlinfo.nl_net; 1054 unsigned index; 1055 int err = -EINVAL; 1056 1057 index = cfg->rc_label; 1058 1059 if (!mpls_label_ok(net, &index, extack)) 1060 goto errout; 1061 1062 mpls_route_update(net, index, NULL, &cfg->rc_nlinfo); 1063 1064 err = 0; 1065 errout: 1066 return err; 1067 } 1068 1069 static void mpls_get_stats(struct mpls_dev *mdev, 1070 struct mpls_link_stats *stats) 1071 { 1072 struct mpls_pcpu_stats *p; 1073 int i; 1074 1075 memset(stats, 0, sizeof(*stats)); 1076 1077 for_each_possible_cpu(i) { 1078 struct mpls_link_stats local; 1079 unsigned int start; 1080 1081 p = per_cpu_ptr(mdev->stats, i); 1082 do { 1083 start = u64_stats_fetch_begin(&p->syncp); 1084 local = p->stats; 1085 } while (u64_stats_fetch_retry(&p->syncp, start)); 1086 1087 stats->rx_packets += local.rx_packets; 1088 stats->rx_bytes += local.rx_bytes; 1089 stats->tx_packets += local.tx_packets; 1090 stats->tx_bytes += local.tx_bytes; 1091 stats->rx_errors += local.rx_errors; 1092 stats->tx_errors += local.tx_errors; 1093 stats->rx_dropped += local.rx_dropped; 1094 stats->tx_dropped += local.tx_dropped; 1095 stats->rx_noroute += local.rx_noroute; 1096 } 1097 } 1098 1099 static int mpls_fill_stats_af(struct sk_buff *skb, 1100 const struct net_device *dev) 1101 { 1102 struct mpls_link_stats *stats; 1103 struct mpls_dev *mdev; 1104 struct nlattr *nla; 1105 1106 mdev = mpls_dev_get(dev); 1107 if (!mdev) 1108 return -ENODATA; 1109 1110 nla = nla_reserve_64bit(skb, MPLS_STATS_LINK, 1111 sizeof(struct mpls_link_stats), 1112 MPLS_STATS_UNSPEC); 1113 if (!nla) 1114 return -EMSGSIZE; 1115 1116 stats = nla_data(nla); 1117 mpls_get_stats(mdev, stats); 1118 1119 return 0; 1120 } 1121 1122 static size_t mpls_get_stats_af_size(const struct net_device *dev) 1123 { 1124 struct mpls_dev *mdev; 1125 1126 mdev = mpls_dev_get(dev); 1127 if (!mdev) 1128 return 0; 1129 1130 return nla_total_size_64bit(sizeof(struct mpls_link_stats)); 1131 } 1132 1133 static int mpls_netconf_fill_devconf(struct sk_buff *skb, struct mpls_dev *mdev, 1134 u32 portid, u32 seq, int event, 1135 unsigned int flags, int type) 1136 { 1137 struct nlmsghdr *nlh; 1138 struct netconfmsg *ncm; 1139 bool all = false; 1140 1141 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 1142 flags); 1143 if (!nlh) 1144 return -EMSGSIZE; 1145 1146 if (type == NETCONFA_ALL) 1147 all = true; 1148 1149 ncm = nlmsg_data(nlh); 1150 ncm->ncm_family = AF_MPLS; 1151 1152 if (nla_put_s32(skb, NETCONFA_IFINDEX, mdev->dev->ifindex) < 0) 1153 goto nla_put_failure; 1154 1155 if ((all || type == NETCONFA_INPUT) && 1156 nla_put_s32(skb, NETCONFA_INPUT, 1157 READ_ONCE(mdev->input_enabled)) < 0) 1158 goto nla_put_failure; 1159 1160 nlmsg_end(skb, nlh); 1161 return 0; 1162 1163 nla_put_failure: 1164 nlmsg_cancel(skb, nlh); 1165 return -EMSGSIZE; 1166 } 1167 1168 static int mpls_netconf_msgsize_devconf(int type) 1169 { 1170 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 1171 + nla_total_size(4); /* NETCONFA_IFINDEX */ 1172 bool all = false; 1173 1174 if (type == NETCONFA_ALL) 1175 all = true; 1176 1177 if (all || type == NETCONFA_INPUT) 1178 size += nla_total_size(4); 1179 1180 return size; 1181 } 1182 1183 static void mpls_netconf_notify_devconf(struct net *net, int event, 1184 int type, struct mpls_dev *mdev) 1185 { 1186 struct sk_buff *skb; 1187 int err = -ENOBUFS; 1188 1189 skb = nlmsg_new(mpls_netconf_msgsize_devconf(type), GFP_KERNEL); 1190 if (!skb) 1191 goto errout; 1192 1193 err = mpls_netconf_fill_devconf(skb, mdev, 0, 0, event, 0, type); 1194 if (err < 0) { 1195 /* -EMSGSIZE implies BUG in mpls_netconf_msgsize_devconf() */ 1196 WARN_ON(err == -EMSGSIZE); 1197 kfree_skb(skb); 1198 goto errout; 1199 } 1200 1201 rtnl_notify(skb, net, 0, RTNLGRP_MPLS_NETCONF, NULL, GFP_KERNEL); 1202 return; 1203 errout: 1204 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 { 1306 unsigned long ifindex; 1307 } *ctx = (void *)cb->ctx; 1308 struct net_device *dev; 1309 struct mpls_dev *mdev; 1310 int err = 0; 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 rcu_read_lock(); 1328 for_each_netdev_dump(net, dev, ctx->ifindex) { 1329 mdev = mpls_dev_get(dev); 1330 if (!mdev) 1331 continue; 1332 err = mpls_netconf_fill_devconf(skb, mdev, 1333 NETLINK_CB(cb->skb).portid, 1334 nlh->nlmsg_seq, 1335 RTM_NEWNETCONF, 1336 NLM_F_MULTI, 1337 NETCONFA_ALL); 1338 if (err < 0) 1339 break; 1340 } 1341 rcu_read_unlock(); 1342 1343 return err; 1344 } 1345 1346 #define MPLS_PERDEV_SYSCTL_OFFSET(field) \ 1347 (&((struct mpls_dev *)0)->field) 1348 1349 static int mpls_conf_proc(const struct ctl_table *ctl, int write, 1350 void *buffer, size_t *lenp, loff_t *ppos) 1351 { 1352 int oval = *(int *)ctl->data; 1353 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 1354 1355 if (write) { 1356 struct mpls_dev *mdev = ctl->extra1; 1357 int i = (int *)ctl->data - (int *)mdev; 1358 struct net *net = ctl->extra2; 1359 int val = *(int *)ctl->data; 1360 1361 if (i == offsetof(struct mpls_dev, input_enabled) && 1362 val != oval) { 1363 mpls_netconf_notify_devconf(net, RTM_NEWNETCONF, 1364 NETCONFA_INPUT, mdev); 1365 } 1366 } 1367 1368 return ret; 1369 } 1370 1371 static const struct ctl_table mpls_dev_table[] = { 1372 { 1373 .procname = "input", 1374 .maxlen = sizeof(int), 1375 .mode = 0644, 1376 .proc_handler = mpls_conf_proc, 1377 .data = MPLS_PERDEV_SYSCTL_OFFSET(input_enabled), 1378 }, 1379 }; 1380 1381 static int mpls_dev_sysctl_register(struct net_device *dev, 1382 struct mpls_dev *mdev) 1383 { 1384 char path[sizeof("net/mpls/conf/") + IFNAMSIZ]; 1385 size_t table_size = ARRAY_SIZE(mpls_dev_table); 1386 struct net *net = dev_net(dev); 1387 struct ctl_table *table; 1388 int i; 1389 1390 table = kmemdup(&mpls_dev_table, sizeof(mpls_dev_table), GFP_KERNEL); 1391 if (!table) 1392 goto out; 1393 1394 /* Table data contains only offsets relative to the base of 1395 * the mdev at this point, so make them absolute. 1396 */ 1397 for (i = 0; i < table_size; i++) { 1398 table[i].data = (char *)mdev + (uintptr_t)table[i].data; 1399 table[i].extra1 = mdev; 1400 table[i].extra2 = net; 1401 } 1402 1403 snprintf(path, sizeof(path), "net/mpls/conf/%s", dev->name); 1404 1405 mdev->sysctl = register_net_sysctl_sz(net, path, table, table_size); 1406 if (!mdev->sysctl) 1407 goto free; 1408 1409 mpls_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, mdev); 1410 return 0; 1411 1412 free: 1413 kfree(table); 1414 out: 1415 mdev->sysctl = NULL; 1416 return -ENOBUFS; 1417 } 1418 1419 static void mpls_dev_sysctl_unregister(struct net_device *dev, 1420 struct mpls_dev *mdev) 1421 { 1422 struct net *net = dev_net(dev); 1423 const struct ctl_table *table; 1424 1425 if (!mdev->sysctl) 1426 return; 1427 1428 table = mdev->sysctl->ctl_table_arg; 1429 unregister_net_sysctl_table(mdev->sysctl); 1430 kfree(table); 1431 1432 mpls_netconf_notify_devconf(net, RTM_DELNETCONF, 0, mdev); 1433 } 1434 1435 static struct mpls_dev *mpls_add_dev(struct net_device *dev) 1436 { 1437 struct mpls_dev *mdev; 1438 int err = -ENOMEM; 1439 int i; 1440 1441 ASSERT_RTNL(); 1442 1443 mdev = kzalloc(sizeof(*mdev), GFP_KERNEL); 1444 if (!mdev) 1445 return ERR_PTR(err); 1446 1447 mdev->stats = alloc_percpu(struct mpls_pcpu_stats); 1448 if (!mdev->stats) 1449 goto free; 1450 1451 for_each_possible_cpu(i) { 1452 struct mpls_pcpu_stats *mpls_stats; 1453 1454 mpls_stats = per_cpu_ptr(mdev->stats, i); 1455 u64_stats_init(&mpls_stats->syncp); 1456 } 1457 1458 mdev->dev = dev; 1459 1460 err = mpls_dev_sysctl_register(dev, mdev); 1461 if (err) 1462 goto free; 1463 1464 rcu_assign_pointer(dev->mpls_ptr, mdev); 1465 1466 return mdev; 1467 1468 free: 1469 free_percpu(mdev->stats); 1470 kfree(mdev); 1471 return ERR_PTR(err); 1472 } 1473 1474 static void mpls_dev_destroy_rcu(struct rcu_head *head) 1475 { 1476 struct mpls_dev *mdev = container_of(head, struct mpls_dev, rcu); 1477 1478 free_percpu(mdev->stats); 1479 kfree(mdev); 1480 } 1481 1482 static int mpls_ifdown(struct net_device *dev, int event) 1483 { 1484 struct mpls_route __rcu **platform_label; 1485 struct net *net = dev_net(dev); 1486 unsigned index; 1487 1488 platform_label = rtnl_dereference(net->mpls.platform_label); 1489 for (index = 0; index < net->mpls.platform_labels; index++) { 1490 struct mpls_route *rt = rtnl_dereference(platform_label[index]); 1491 bool nh_del = false; 1492 u8 alive = 0; 1493 1494 if (!rt) 1495 continue; 1496 1497 if (event == NETDEV_UNREGISTER) { 1498 u8 deleted = 0; 1499 1500 for_nexthops(rt) { 1501 if (!nh->nh_dev || nh->nh_dev == dev) 1502 deleted++; 1503 if (nh->nh_dev == dev) 1504 nh_del = true; 1505 } endfor_nexthops(rt); 1506 1507 /* if there are no more nexthops, delete the route */ 1508 if (deleted == rt->rt_nhn) { 1509 mpls_route_update(net, index, NULL, NULL); 1510 continue; 1511 } 1512 1513 if (nh_del) { 1514 size_t size = sizeof(*rt) + rt->rt_nhn * 1515 rt->rt_nh_size; 1516 struct mpls_route *orig = rt; 1517 1518 rt = kmemdup(orig, size, GFP_KERNEL); 1519 if (!rt) 1520 return -ENOMEM; 1521 } 1522 } 1523 1524 change_nexthops(rt) { 1525 unsigned int nh_flags = nh->nh_flags; 1526 1527 if (nh->nh_dev != dev) 1528 goto next; 1529 1530 switch (event) { 1531 case NETDEV_DOWN: 1532 case NETDEV_UNREGISTER: 1533 nh_flags |= RTNH_F_DEAD; 1534 fallthrough; 1535 case NETDEV_CHANGE: 1536 nh_flags |= RTNH_F_LINKDOWN; 1537 break; 1538 } 1539 if (event == NETDEV_UNREGISTER) 1540 nh->nh_dev = NULL; 1541 1542 if (nh->nh_flags != nh_flags) 1543 WRITE_ONCE(nh->nh_flags, nh_flags); 1544 next: 1545 if (!(nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN))) 1546 alive++; 1547 } endfor_nexthops(rt); 1548 1549 WRITE_ONCE(rt->rt_nhn_alive, alive); 1550 1551 if (nh_del) 1552 mpls_route_update(net, index, rt, NULL); 1553 } 1554 1555 return 0; 1556 } 1557 1558 static void mpls_ifup(struct net_device *dev, unsigned int flags) 1559 { 1560 struct mpls_route __rcu **platform_label; 1561 struct net *net = dev_net(dev); 1562 unsigned index; 1563 u8 alive; 1564 1565 platform_label = rtnl_dereference(net->mpls.platform_label); 1566 for (index = 0; index < net->mpls.platform_labels; index++) { 1567 struct mpls_route *rt = rtnl_dereference(platform_label[index]); 1568 1569 if (!rt) 1570 continue; 1571 1572 alive = 0; 1573 change_nexthops(rt) { 1574 unsigned int nh_flags = nh->nh_flags; 1575 1576 if (!(nh_flags & flags)) { 1577 alive++; 1578 continue; 1579 } 1580 if (nh->nh_dev != dev) 1581 continue; 1582 alive++; 1583 nh_flags &= ~flags; 1584 WRITE_ONCE(nh->nh_flags, nh_flags); 1585 } endfor_nexthops(rt); 1586 1587 WRITE_ONCE(rt->rt_nhn_alive, alive); 1588 } 1589 } 1590 1591 static int mpls_dev_notify(struct notifier_block *this, unsigned long event, 1592 void *ptr) 1593 { 1594 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1595 struct mpls_dev *mdev; 1596 unsigned int flags; 1597 int err; 1598 1599 if (event == NETDEV_REGISTER) { 1600 mdev = mpls_add_dev(dev); 1601 if (IS_ERR(mdev)) 1602 return notifier_from_errno(PTR_ERR(mdev)); 1603 1604 return NOTIFY_OK; 1605 } 1606 1607 mdev = mpls_dev_get(dev); 1608 if (!mdev) 1609 return NOTIFY_OK; 1610 1611 switch (event) { 1612 1613 case NETDEV_DOWN: 1614 err = mpls_ifdown(dev, event); 1615 if (err) 1616 return notifier_from_errno(err); 1617 break; 1618 case NETDEV_UP: 1619 flags = dev_get_flags(dev); 1620 if (flags & (IFF_RUNNING | IFF_LOWER_UP)) 1621 mpls_ifup(dev, RTNH_F_DEAD | RTNH_F_LINKDOWN); 1622 else 1623 mpls_ifup(dev, RTNH_F_DEAD); 1624 break; 1625 case NETDEV_CHANGE: 1626 flags = dev_get_flags(dev); 1627 if (flags & (IFF_RUNNING | IFF_LOWER_UP)) { 1628 mpls_ifup(dev, RTNH_F_DEAD | RTNH_F_LINKDOWN); 1629 } else { 1630 err = mpls_ifdown(dev, event); 1631 if (err) 1632 return notifier_from_errno(err); 1633 } 1634 break; 1635 case NETDEV_UNREGISTER: 1636 err = mpls_ifdown(dev, event); 1637 if (err) 1638 return notifier_from_errno(err); 1639 mdev = mpls_dev_get(dev); 1640 if (mdev) { 1641 mpls_dev_sysctl_unregister(dev, mdev); 1642 RCU_INIT_POINTER(dev->mpls_ptr, NULL); 1643 call_rcu(&mdev->rcu, mpls_dev_destroy_rcu); 1644 } 1645 break; 1646 case NETDEV_CHANGENAME: 1647 mdev = mpls_dev_get(dev); 1648 if (mdev) { 1649 mpls_dev_sysctl_unregister(dev, mdev); 1650 err = mpls_dev_sysctl_register(dev, mdev); 1651 if (err) 1652 return notifier_from_errno(err); 1653 } 1654 break; 1655 } 1656 return NOTIFY_OK; 1657 } 1658 1659 static struct notifier_block mpls_dev_notifier = { 1660 .notifier_call = mpls_dev_notify, 1661 }; 1662 1663 static int nla_put_via(struct sk_buff *skb, 1664 u8 table, const void *addr, int alen) 1665 { 1666 static const int table_to_family[NEIGH_NR_TABLES + 1] = { 1667 AF_INET, AF_INET6, AF_DECnet, AF_PACKET, 1668 }; 1669 struct nlattr *nla; 1670 struct rtvia *via; 1671 int family = AF_UNSPEC; 1672 1673 nla = nla_reserve(skb, RTA_VIA, alen + 2); 1674 if (!nla) 1675 return -EMSGSIZE; 1676 1677 if (table <= NEIGH_NR_TABLES) 1678 family = table_to_family[table]; 1679 1680 via = nla_data(nla); 1681 via->rtvia_family = family; 1682 memcpy(via->rtvia_addr, addr, alen); 1683 return 0; 1684 } 1685 1686 int nla_put_labels(struct sk_buff *skb, int attrtype, 1687 u8 labels, const u32 label[]) 1688 { 1689 struct nlattr *nla; 1690 struct mpls_shim_hdr *nla_label; 1691 bool bos; 1692 int i; 1693 nla = nla_reserve(skb, attrtype, labels*4); 1694 if (!nla) 1695 return -EMSGSIZE; 1696 1697 nla_label = nla_data(nla); 1698 bos = true; 1699 for (i = labels - 1; i >= 0; i--) { 1700 nla_label[i] = mpls_entry_encode(label[i], 0, 0, bos); 1701 bos = false; 1702 } 1703 1704 return 0; 1705 } 1706 EXPORT_SYMBOL_GPL(nla_put_labels); 1707 1708 int nla_get_labels(const struct nlattr *nla, u8 max_labels, u8 *labels, 1709 u32 label[], struct netlink_ext_ack *extack) 1710 { 1711 unsigned len = nla_len(nla); 1712 struct mpls_shim_hdr *nla_label; 1713 u8 nla_labels; 1714 bool bos; 1715 int i; 1716 1717 /* len needs to be an even multiple of 4 (the label size). Number 1718 * of labels is a u8 so check for overflow. 1719 */ 1720 if (len & 3 || len / 4 > 255) { 1721 NL_SET_ERR_MSG_ATTR(extack, nla, 1722 "Invalid length for labels attribute"); 1723 return -EINVAL; 1724 } 1725 1726 /* Limit the number of new labels allowed */ 1727 nla_labels = len/4; 1728 if (nla_labels > max_labels) { 1729 NL_SET_ERR_MSG(extack, "Too many labels"); 1730 return -EINVAL; 1731 } 1732 1733 /* when label == NULL, caller wants number of labels */ 1734 if (!label) 1735 goto out; 1736 1737 nla_label = nla_data(nla); 1738 bos = true; 1739 for (i = nla_labels - 1; i >= 0; i--, bos = false) { 1740 struct mpls_entry_decoded dec; 1741 dec = mpls_entry_decode(nla_label + i); 1742 1743 /* Ensure the bottom of stack flag is properly set 1744 * and ttl and tc are both clear. 1745 */ 1746 if (dec.ttl) { 1747 NL_SET_ERR_MSG_ATTR(extack, nla, 1748 "TTL in label must be 0"); 1749 return -EINVAL; 1750 } 1751 1752 if (dec.tc) { 1753 NL_SET_ERR_MSG_ATTR(extack, nla, 1754 "Traffic class in label must be 0"); 1755 return -EINVAL; 1756 } 1757 1758 if (dec.bos != bos) { 1759 NL_SET_BAD_ATTR(extack, nla); 1760 if (bos) { 1761 NL_SET_ERR_MSG(extack, 1762 "BOS bit must be set in first label"); 1763 } else { 1764 NL_SET_ERR_MSG(extack, 1765 "BOS bit can only be set in first label"); 1766 } 1767 return -EINVAL; 1768 } 1769 1770 switch (dec.label) { 1771 case MPLS_LABEL_IMPLNULL: 1772 /* RFC3032: This is a label that an LSR may 1773 * assign and distribute, but which never 1774 * actually appears in the encapsulation. 1775 */ 1776 NL_SET_ERR_MSG_ATTR(extack, nla, 1777 "Implicit NULL Label (3) can not be used in encapsulation"); 1778 return -EINVAL; 1779 } 1780 1781 label[i] = dec.label; 1782 } 1783 out: 1784 *labels = nla_labels; 1785 return 0; 1786 } 1787 EXPORT_SYMBOL_GPL(nla_get_labels); 1788 1789 static int rtm_to_route_config(struct sk_buff *skb, 1790 struct nlmsghdr *nlh, 1791 struct mpls_route_config *cfg, 1792 struct netlink_ext_ack *extack) 1793 { 1794 struct rtmsg *rtm; 1795 struct nlattr *tb[RTA_MAX+1]; 1796 int index; 1797 int err; 1798 1799 err = nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX, 1800 rtm_mpls_policy, extack); 1801 if (err < 0) 1802 goto errout; 1803 1804 err = -EINVAL; 1805 rtm = nlmsg_data(nlh); 1806 1807 if (rtm->rtm_family != AF_MPLS) { 1808 NL_SET_ERR_MSG(extack, "Invalid address family in rtmsg"); 1809 goto errout; 1810 } 1811 if (rtm->rtm_dst_len != 20) { 1812 NL_SET_ERR_MSG(extack, "rtm_dst_len must be 20 for MPLS"); 1813 goto errout; 1814 } 1815 if (rtm->rtm_src_len != 0) { 1816 NL_SET_ERR_MSG(extack, "rtm_src_len must be 0 for MPLS"); 1817 goto errout; 1818 } 1819 if (rtm->rtm_tos != 0) { 1820 NL_SET_ERR_MSG(extack, "rtm_tos must be 0 for MPLS"); 1821 goto errout; 1822 } 1823 if (rtm->rtm_table != RT_TABLE_MAIN) { 1824 NL_SET_ERR_MSG(extack, 1825 "MPLS only supports the main route table"); 1826 goto errout; 1827 } 1828 /* Any value is acceptable for rtm_protocol */ 1829 1830 /* As mpls uses destination specific addresses 1831 * (or source specific address in the case of multicast) 1832 * all addresses have universal scope. 1833 */ 1834 if (rtm->rtm_scope != RT_SCOPE_UNIVERSE) { 1835 NL_SET_ERR_MSG(extack, 1836 "Invalid route scope - MPLS only supports UNIVERSE"); 1837 goto errout; 1838 } 1839 if (rtm->rtm_type != RTN_UNICAST) { 1840 NL_SET_ERR_MSG(extack, 1841 "Invalid route type - MPLS only supports UNICAST"); 1842 goto errout; 1843 } 1844 if (rtm->rtm_flags != 0) { 1845 NL_SET_ERR_MSG(extack, "rtm_flags must be 0 for MPLS"); 1846 goto errout; 1847 } 1848 1849 cfg->rc_label = LABEL_NOT_SPECIFIED; 1850 cfg->rc_protocol = rtm->rtm_protocol; 1851 cfg->rc_via_table = MPLS_NEIGH_TABLE_UNSPEC; 1852 cfg->rc_ttl_propagate = MPLS_TTL_PROP_DEFAULT; 1853 cfg->rc_nlflags = nlh->nlmsg_flags; 1854 cfg->rc_nlinfo.portid = NETLINK_CB(skb).portid; 1855 cfg->rc_nlinfo.nlh = nlh; 1856 cfg->rc_nlinfo.nl_net = sock_net(skb->sk); 1857 1858 for (index = 0; index <= RTA_MAX; index++) { 1859 struct nlattr *nla = tb[index]; 1860 if (!nla) 1861 continue; 1862 1863 switch (index) { 1864 case RTA_OIF: 1865 cfg->rc_ifindex = nla_get_u32(nla); 1866 break; 1867 case RTA_NEWDST: 1868 if (nla_get_labels(nla, MAX_NEW_LABELS, 1869 &cfg->rc_output_labels, 1870 cfg->rc_output_label, extack)) 1871 goto errout; 1872 break; 1873 case RTA_DST: 1874 { 1875 u8 label_count; 1876 if (nla_get_labels(nla, 1, &label_count, 1877 &cfg->rc_label, extack)) 1878 goto errout; 1879 1880 if (!mpls_label_ok(cfg->rc_nlinfo.nl_net, 1881 &cfg->rc_label, extack)) 1882 goto errout; 1883 break; 1884 } 1885 case RTA_GATEWAY: 1886 NL_SET_ERR_MSG(extack, "MPLS does not support RTA_GATEWAY attribute"); 1887 goto errout; 1888 case RTA_VIA: 1889 { 1890 if (nla_get_via(nla, &cfg->rc_via_alen, 1891 &cfg->rc_via_table, cfg->rc_via, 1892 extack)) 1893 goto errout; 1894 break; 1895 } 1896 case RTA_MULTIPATH: 1897 { 1898 cfg->rc_mp = nla_data(nla); 1899 cfg->rc_mp_len = nla_len(nla); 1900 break; 1901 } 1902 case RTA_TTL_PROPAGATE: 1903 { 1904 u8 ttl_propagate = nla_get_u8(nla); 1905 1906 if (ttl_propagate > 1) { 1907 NL_SET_ERR_MSG_ATTR(extack, nla, 1908 "RTA_TTL_PROPAGATE can only be 0 or 1"); 1909 goto errout; 1910 } 1911 cfg->rc_ttl_propagate = ttl_propagate ? 1912 MPLS_TTL_PROP_ENABLED : 1913 MPLS_TTL_PROP_DISABLED; 1914 break; 1915 } 1916 default: 1917 NL_SET_ERR_MSG_ATTR(extack, nla, "Unknown attribute"); 1918 /* Unsupported attribute */ 1919 goto errout; 1920 } 1921 } 1922 1923 err = 0; 1924 errout: 1925 return err; 1926 } 1927 1928 static int mpls_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, 1929 struct netlink_ext_ack *extack) 1930 { 1931 struct mpls_route_config *cfg; 1932 int err; 1933 1934 cfg = kzalloc(sizeof(*cfg), GFP_KERNEL); 1935 if (!cfg) 1936 return -ENOMEM; 1937 1938 err = rtm_to_route_config(skb, nlh, cfg, extack); 1939 if (err < 0) 1940 goto out; 1941 1942 err = mpls_route_del(cfg, extack); 1943 out: 1944 kfree(cfg); 1945 1946 return err; 1947 } 1948 1949 1950 static int mpls_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, 1951 struct netlink_ext_ack *extack) 1952 { 1953 struct mpls_route_config *cfg; 1954 int err; 1955 1956 cfg = kzalloc(sizeof(*cfg), GFP_KERNEL); 1957 if (!cfg) 1958 return -ENOMEM; 1959 1960 err = rtm_to_route_config(skb, nlh, cfg, extack); 1961 if (err < 0) 1962 goto out; 1963 1964 err = mpls_route_add(cfg, extack); 1965 out: 1966 kfree(cfg); 1967 1968 return err; 1969 } 1970 1971 static int mpls_dump_route(struct sk_buff *skb, u32 portid, u32 seq, int event, 1972 u32 label, struct mpls_route *rt, int flags) 1973 { 1974 struct net_device *dev; 1975 struct nlmsghdr *nlh; 1976 struct rtmsg *rtm; 1977 1978 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*rtm), flags); 1979 if (nlh == NULL) 1980 return -EMSGSIZE; 1981 1982 rtm = nlmsg_data(nlh); 1983 rtm->rtm_family = AF_MPLS; 1984 rtm->rtm_dst_len = 20; 1985 rtm->rtm_src_len = 0; 1986 rtm->rtm_tos = 0; 1987 rtm->rtm_table = RT_TABLE_MAIN; 1988 rtm->rtm_protocol = rt->rt_protocol; 1989 rtm->rtm_scope = RT_SCOPE_UNIVERSE; 1990 rtm->rtm_type = RTN_UNICAST; 1991 rtm->rtm_flags = 0; 1992 1993 if (nla_put_labels(skb, RTA_DST, 1, &label)) 1994 goto nla_put_failure; 1995 1996 if (rt->rt_ttl_propagate != MPLS_TTL_PROP_DEFAULT) { 1997 bool ttl_propagate = 1998 rt->rt_ttl_propagate == MPLS_TTL_PROP_ENABLED; 1999 2000 if (nla_put_u8(skb, RTA_TTL_PROPAGATE, 2001 ttl_propagate)) 2002 goto nla_put_failure; 2003 } 2004 if (rt->rt_nhn == 1) { 2005 const struct mpls_nh *nh = rt->rt_nh; 2006 2007 if (nh->nh_labels && 2008 nla_put_labels(skb, RTA_NEWDST, nh->nh_labels, 2009 nh->nh_label)) 2010 goto nla_put_failure; 2011 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC && 2012 nla_put_via(skb, nh->nh_via_table, mpls_nh_via(rt, nh), 2013 nh->nh_via_alen)) 2014 goto nla_put_failure; 2015 dev = nh->nh_dev; 2016 if (dev && nla_put_u32(skb, RTA_OIF, dev->ifindex)) 2017 goto nla_put_failure; 2018 if (nh->nh_flags & RTNH_F_LINKDOWN) 2019 rtm->rtm_flags |= RTNH_F_LINKDOWN; 2020 if (nh->nh_flags & RTNH_F_DEAD) 2021 rtm->rtm_flags |= RTNH_F_DEAD; 2022 } else { 2023 struct rtnexthop *rtnh; 2024 struct nlattr *mp; 2025 u8 linkdown = 0; 2026 u8 dead = 0; 2027 2028 mp = nla_nest_start_noflag(skb, RTA_MULTIPATH); 2029 if (!mp) 2030 goto nla_put_failure; 2031 2032 for_nexthops(rt) { 2033 dev = nh->nh_dev; 2034 if (!dev) 2035 continue; 2036 2037 rtnh = nla_reserve_nohdr(skb, sizeof(*rtnh)); 2038 if (!rtnh) 2039 goto nla_put_failure; 2040 2041 rtnh->rtnh_ifindex = dev->ifindex; 2042 if (nh->nh_flags & RTNH_F_LINKDOWN) { 2043 rtnh->rtnh_flags |= RTNH_F_LINKDOWN; 2044 linkdown++; 2045 } 2046 if (nh->nh_flags & RTNH_F_DEAD) { 2047 rtnh->rtnh_flags |= RTNH_F_DEAD; 2048 dead++; 2049 } 2050 2051 if (nh->nh_labels && nla_put_labels(skb, RTA_NEWDST, 2052 nh->nh_labels, 2053 nh->nh_label)) 2054 goto nla_put_failure; 2055 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC && 2056 nla_put_via(skb, nh->nh_via_table, 2057 mpls_nh_via(rt, nh), 2058 nh->nh_via_alen)) 2059 goto nla_put_failure; 2060 2061 /* length of rtnetlink header + attributes */ 2062 rtnh->rtnh_len = nlmsg_get_pos(skb) - (void *)rtnh; 2063 } endfor_nexthops(rt); 2064 2065 if (linkdown == rt->rt_nhn) 2066 rtm->rtm_flags |= RTNH_F_LINKDOWN; 2067 if (dead == rt->rt_nhn) 2068 rtm->rtm_flags |= RTNH_F_DEAD; 2069 2070 nla_nest_end(skb, mp); 2071 } 2072 2073 nlmsg_end(skb, nlh); 2074 return 0; 2075 2076 nla_put_failure: 2077 nlmsg_cancel(skb, nlh); 2078 return -EMSGSIZE; 2079 } 2080 2081 #if IS_ENABLED(CONFIG_INET) 2082 static int mpls_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh, 2083 struct fib_dump_filter *filter, 2084 struct netlink_callback *cb) 2085 { 2086 return ip_valid_fib_dump_req(net, nlh, filter, cb); 2087 } 2088 #else 2089 static int mpls_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh, 2090 struct fib_dump_filter *filter, 2091 struct netlink_callback *cb) 2092 { 2093 struct netlink_ext_ack *extack = cb->extack; 2094 struct nlattr *tb[RTA_MAX + 1]; 2095 struct rtmsg *rtm; 2096 int err, i; 2097 2098 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) { 2099 NL_SET_ERR_MSG_MOD(extack, "Invalid header for FIB dump request"); 2100 return -EINVAL; 2101 } 2102 2103 rtm = nlmsg_data(nlh); 2104 if (rtm->rtm_dst_len || rtm->rtm_src_len || rtm->rtm_tos || 2105 rtm->rtm_table || rtm->rtm_scope || rtm->rtm_type || 2106 rtm->rtm_flags) { 2107 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for FIB dump request"); 2108 return -EINVAL; 2109 } 2110 2111 if (rtm->rtm_protocol) { 2112 filter->protocol = rtm->rtm_protocol; 2113 filter->filter_set = 1; 2114 cb->answer_flags = NLM_F_DUMP_FILTERED; 2115 } 2116 2117 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX, 2118 rtm_mpls_policy, extack); 2119 if (err < 0) 2120 return err; 2121 2122 for (i = 0; i <= RTA_MAX; ++i) { 2123 int ifindex; 2124 2125 if (i == RTA_OIF) { 2126 ifindex = nla_get_u32(tb[i]); 2127 filter->dev = __dev_get_by_index(net, ifindex); 2128 if (!filter->dev) 2129 return -ENODEV; 2130 filter->filter_set = 1; 2131 } else if (tb[i]) { 2132 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request"); 2133 return -EINVAL; 2134 } 2135 } 2136 2137 return 0; 2138 } 2139 #endif 2140 2141 static bool mpls_rt_uses_dev(struct mpls_route *rt, 2142 const struct net_device *dev) 2143 { 2144 if (rt->rt_nhn == 1) { 2145 struct mpls_nh *nh = rt->rt_nh; 2146 2147 if (nh->nh_dev == dev) 2148 return true; 2149 } else { 2150 for_nexthops(rt) { 2151 if (nh->nh_dev == dev) 2152 return true; 2153 } endfor_nexthops(rt); 2154 } 2155 2156 return false; 2157 } 2158 2159 static int mpls_dump_routes(struct sk_buff *skb, struct netlink_callback *cb) 2160 { 2161 const struct nlmsghdr *nlh = cb->nlh; 2162 struct net *net = sock_net(skb->sk); 2163 struct mpls_route __rcu **platform_label; 2164 struct fib_dump_filter filter = { 2165 .rtnl_held = true, 2166 }; 2167 unsigned int flags = NLM_F_MULTI; 2168 size_t platform_labels; 2169 unsigned int index; 2170 2171 ASSERT_RTNL(); 2172 2173 if (cb->strict_check) { 2174 int err; 2175 2176 err = mpls_valid_fib_dump_req(net, nlh, &filter, cb); 2177 if (err < 0) 2178 return err; 2179 2180 /* for MPLS, there is only 1 table with fixed type and flags. 2181 * If either are set in the filter then return nothing. 2182 */ 2183 if ((filter.table_id && filter.table_id != RT_TABLE_MAIN) || 2184 (filter.rt_type && filter.rt_type != RTN_UNICAST) || 2185 filter.flags) 2186 return skb->len; 2187 } 2188 2189 index = cb->args[0]; 2190 if (index < MPLS_LABEL_FIRST_UNRESERVED) 2191 index = MPLS_LABEL_FIRST_UNRESERVED; 2192 2193 platform_label = rtnl_dereference(net->mpls.platform_label); 2194 platform_labels = net->mpls.platform_labels; 2195 2196 if (filter.filter_set) 2197 flags |= NLM_F_DUMP_FILTERED; 2198 2199 for (; index < platform_labels; index++) { 2200 struct mpls_route *rt; 2201 2202 rt = rtnl_dereference(platform_label[index]); 2203 if (!rt) 2204 continue; 2205 2206 if ((filter.dev && !mpls_rt_uses_dev(rt, filter.dev)) || 2207 (filter.protocol && rt->rt_protocol != filter.protocol)) 2208 continue; 2209 2210 if (mpls_dump_route(skb, NETLINK_CB(cb->skb).portid, 2211 cb->nlh->nlmsg_seq, RTM_NEWROUTE, 2212 index, rt, flags) < 0) 2213 break; 2214 } 2215 cb->args[0] = index; 2216 2217 return skb->len; 2218 } 2219 2220 static inline size_t lfib_nlmsg_size(struct mpls_route *rt) 2221 { 2222 size_t payload = 2223 NLMSG_ALIGN(sizeof(struct rtmsg)) 2224 + nla_total_size(4) /* RTA_DST */ 2225 + nla_total_size(1); /* RTA_TTL_PROPAGATE */ 2226 2227 if (rt->rt_nhn == 1) { 2228 struct mpls_nh *nh = rt->rt_nh; 2229 2230 if (nh->nh_dev) 2231 payload += nla_total_size(4); /* RTA_OIF */ 2232 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC) /* RTA_VIA */ 2233 payload += nla_total_size(2 + nh->nh_via_alen); 2234 if (nh->nh_labels) /* RTA_NEWDST */ 2235 payload += nla_total_size(nh->nh_labels * 4); 2236 } else { 2237 /* each nexthop is packed in an attribute */ 2238 size_t nhsize = 0; 2239 2240 for_nexthops(rt) { 2241 if (!nh->nh_dev) 2242 continue; 2243 nhsize += nla_total_size(sizeof(struct rtnexthop)); 2244 /* RTA_VIA */ 2245 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC) 2246 nhsize += nla_total_size(2 + nh->nh_via_alen); 2247 if (nh->nh_labels) 2248 nhsize += nla_total_size(nh->nh_labels * 4); 2249 } endfor_nexthops(rt); 2250 /* nested attribute */ 2251 payload += nla_total_size(nhsize); 2252 } 2253 2254 return payload; 2255 } 2256 2257 static void rtmsg_lfib(int event, u32 label, struct mpls_route *rt, 2258 struct nlmsghdr *nlh, struct net *net, u32 portid, 2259 unsigned int nlm_flags) 2260 { 2261 struct sk_buff *skb; 2262 u32 seq = nlh ? nlh->nlmsg_seq : 0; 2263 int err = -ENOBUFS; 2264 2265 skb = nlmsg_new(lfib_nlmsg_size(rt), GFP_KERNEL); 2266 if (skb == NULL) 2267 goto errout; 2268 2269 err = mpls_dump_route(skb, portid, seq, event, label, rt, nlm_flags); 2270 if (err < 0) { 2271 /* -EMSGSIZE implies BUG in lfib_nlmsg_size */ 2272 WARN_ON(err == -EMSGSIZE); 2273 kfree_skb(skb); 2274 goto errout; 2275 } 2276 rtnl_notify(skb, net, portid, RTNLGRP_MPLS_ROUTE, nlh, GFP_KERNEL); 2277 2278 return; 2279 errout: 2280 rtnl_set_sk_err(net, RTNLGRP_MPLS_ROUTE, err); 2281 } 2282 2283 static int mpls_valid_getroute_req(struct sk_buff *skb, 2284 const struct nlmsghdr *nlh, 2285 struct nlattr **tb, 2286 struct netlink_ext_ack *extack) 2287 { 2288 struct rtmsg *rtm; 2289 int i, err; 2290 2291 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) { 2292 NL_SET_ERR_MSG_MOD(extack, 2293 "Invalid header for get route request"); 2294 return -EINVAL; 2295 } 2296 2297 if (!netlink_strict_get_check(skb)) 2298 return nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX, 2299 rtm_mpls_policy, extack); 2300 2301 rtm = nlmsg_data(nlh); 2302 if ((rtm->rtm_dst_len && rtm->rtm_dst_len != 20) || 2303 rtm->rtm_src_len || rtm->rtm_tos || rtm->rtm_table || 2304 rtm->rtm_protocol || rtm->rtm_scope || rtm->rtm_type) { 2305 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get route request"); 2306 return -EINVAL; 2307 } 2308 if (rtm->rtm_flags & ~RTM_F_FIB_MATCH) { 2309 NL_SET_ERR_MSG_MOD(extack, 2310 "Invalid flags for get route request"); 2311 return -EINVAL; 2312 } 2313 2314 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX, 2315 rtm_mpls_policy, extack); 2316 if (err) 2317 return err; 2318 2319 if ((tb[RTA_DST] || tb[RTA_NEWDST]) && !rtm->rtm_dst_len) { 2320 NL_SET_ERR_MSG_MOD(extack, "rtm_dst_len must be 20 for MPLS"); 2321 return -EINVAL; 2322 } 2323 2324 for (i = 0; i <= RTA_MAX; i++) { 2325 if (!tb[i]) 2326 continue; 2327 2328 switch (i) { 2329 case RTA_DST: 2330 case RTA_NEWDST: 2331 break; 2332 default: 2333 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get route request"); 2334 return -EINVAL; 2335 } 2336 } 2337 2338 return 0; 2339 } 2340 2341 static int mpls_getroute(struct sk_buff *in_skb, struct nlmsghdr *in_nlh, 2342 struct netlink_ext_ack *extack) 2343 { 2344 struct net *net = sock_net(in_skb->sk); 2345 u32 portid = NETLINK_CB(in_skb).portid; 2346 u32 in_label = LABEL_NOT_SPECIFIED; 2347 struct nlattr *tb[RTA_MAX + 1]; 2348 u32 labels[MAX_NEW_LABELS]; 2349 struct mpls_shim_hdr *hdr; 2350 unsigned int hdr_size = 0; 2351 const struct mpls_nh *nh; 2352 struct net_device *dev; 2353 struct mpls_route *rt; 2354 struct rtmsg *rtm, *r; 2355 struct nlmsghdr *nlh; 2356 struct sk_buff *skb; 2357 u8 n_labels; 2358 int err; 2359 2360 err = mpls_valid_getroute_req(in_skb, in_nlh, tb, extack); 2361 if (err < 0) 2362 goto errout; 2363 2364 rtm = nlmsg_data(in_nlh); 2365 2366 if (tb[RTA_DST]) { 2367 u8 label_count; 2368 2369 if (nla_get_labels(tb[RTA_DST], 1, &label_count, 2370 &in_label, extack)) { 2371 err = -EINVAL; 2372 goto errout; 2373 } 2374 2375 if (!mpls_label_ok(net, &in_label, extack)) { 2376 err = -EINVAL; 2377 goto errout; 2378 } 2379 } 2380 2381 rt = mpls_route_input_rcu(net, in_label); 2382 if (!rt) { 2383 err = -ENETUNREACH; 2384 goto errout; 2385 } 2386 2387 if (rtm->rtm_flags & RTM_F_FIB_MATCH) { 2388 skb = nlmsg_new(lfib_nlmsg_size(rt), GFP_KERNEL); 2389 if (!skb) { 2390 err = -ENOBUFS; 2391 goto errout; 2392 } 2393 2394 err = mpls_dump_route(skb, portid, in_nlh->nlmsg_seq, 2395 RTM_NEWROUTE, in_label, rt, 0); 2396 if (err < 0) { 2397 /* -EMSGSIZE implies BUG in lfib_nlmsg_size */ 2398 WARN_ON(err == -EMSGSIZE); 2399 goto errout_free; 2400 } 2401 2402 return rtnl_unicast(skb, net, portid); 2403 } 2404 2405 if (tb[RTA_NEWDST]) { 2406 if (nla_get_labels(tb[RTA_NEWDST], MAX_NEW_LABELS, &n_labels, 2407 labels, extack) != 0) { 2408 err = -EINVAL; 2409 goto errout; 2410 } 2411 2412 hdr_size = n_labels * sizeof(struct mpls_shim_hdr); 2413 } 2414 2415 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); 2416 if (!skb) { 2417 err = -ENOBUFS; 2418 goto errout; 2419 } 2420 2421 skb->protocol = htons(ETH_P_MPLS_UC); 2422 2423 if (hdr_size) { 2424 bool bos; 2425 int i; 2426 2427 if (skb_cow(skb, hdr_size)) { 2428 err = -ENOBUFS; 2429 goto errout_free; 2430 } 2431 2432 skb_reserve(skb, hdr_size); 2433 skb_push(skb, hdr_size); 2434 skb_reset_network_header(skb); 2435 2436 /* Push new labels */ 2437 hdr = mpls_hdr(skb); 2438 bos = true; 2439 for (i = n_labels - 1; i >= 0; i--) { 2440 hdr[i] = mpls_entry_encode(labels[i], 2441 1, 0, bos); 2442 bos = false; 2443 } 2444 } 2445 2446 nh = mpls_select_multipath(rt, skb); 2447 if (!nh) { 2448 err = -ENETUNREACH; 2449 goto errout_free; 2450 } 2451 2452 if (hdr_size) { 2453 skb_pull(skb, hdr_size); 2454 skb_reset_network_header(skb); 2455 } 2456 2457 nlh = nlmsg_put(skb, portid, in_nlh->nlmsg_seq, 2458 RTM_NEWROUTE, sizeof(*r), 0); 2459 if (!nlh) { 2460 err = -EMSGSIZE; 2461 goto errout_free; 2462 } 2463 2464 r = nlmsg_data(nlh); 2465 r->rtm_family = AF_MPLS; 2466 r->rtm_dst_len = 20; 2467 r->rtm_src_len = 0; 2468 r->rtm_table = RT_TABLE_MAIN; 2469 r->rtm_type = RTN_UNICAST; 2470 r->rtm_scope = RT_SCOPE_UNIVERSE; 2471 r->rtm_protocol = rt->rt_protocol; 2472 r->rtm_flags = 0; 2473 2474 if (nla_put_labels(skb, RTA_DST, 1, &in_label)) 2475 goto nla_put_failure; 2476 2477 if (nh->nh_labels && 2478 nla_put_labels(skb, RTA_NEWDST, nh->nh_labels, 2479 nh->nh_label)) 2480 goto nla_put_failure; 2481 2482 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC && 2483 nla_put_via(skb, nh->nh_via_table, mpls_nh_via(rt, nh), 2484 nh->nh_via_alen)) 2485 goto nla_put_failure; 2486 dev = nh->nh_dev; 2487 if (dev && nla_put_u32(skb, RTA_OIF, dev->ifindex)) 2488 goto nla_put_failure; 2489 2490 nlmsg_end(skb, nlh); 2491 2492 err = rtnl_unicast(skb, net, portid); 2493 errout: 2494 return err; 2495 2496 nla_put_failure: 2497 nlmsg_cancel(skb, nlh); 2498 err = -EMSGSIZE; 2499 errout_free: 2500 kfree_skb(skb); 2501 return err; 2502 } 2503 2504 static int resize_platform_label_table(struct net *net, size_t limit) 2505 { 2506 size_t size = sizeof(struct mpls_route *) * limit; 2507 size_t old_limit; 2508 size_t cp_size; 2509 struct mpls_route __rcu **labels = NULL, **old; 2510 struct mpls_route *rt0 = NULL, *rt2 = NULL; 2511 unsigned index; 2512 2513 if (size) { 2514 labels = kvzalloc(size, GFP_KERNEL); 2515 if (!labels) 2516 goto nolabels; 2517 } 2518 2519 /* In case the predefined labels need to be populated */ 2520 if (limit > MPLS_LABEL_IPV4NULL) { 2521 struct net_device *lo = net->loopback_dev; 2522 rt0 = mpls_rt_alloc(1, lo->addr_len, 0); 2523 if (IS_ERR(rt0)) 2524 goto nort0; 2525 rt0->rt_nh->nh_dev = lo; 2526 rt0->rt_protocol = RTPROT_KERNEL; 2527 rt0->rt_payload_type = MPT_IPV4; 2528 rt0->rt_ttl_propagate = MPLS_TTL_PROP_DEFAULT; 2529 rt0->rt_nh->nh_via_table = NEIGH_LINK_TABLE; 2530 rt0->rt_nh->nh_via_alen = lo->addr_len; 2531 memcpy(__mpls_nh_via(rt0, rt0->rt_nh), lo->dev_addr, 2532 lo->addr_len); 2533 } 2534 if (limit > MPLS_LABEL_IPV6NULL) { 2535 struct net_device *lo = net->loopback_dev; 2536 rt2 = mpls_rt_alloc(1, lo->addr_len, 0); 2537 if (IS_ERR(rt2)) 2538 goto nort2; 2539 rt2->rt_nh->nh_dev = lo; 2540 rt2->rt_protocol = RTPROT_KERNEL; 2541 rt2->rt_payload_type = MPT_IPV6; 2542 rt2->rt_ttl_propagate = MPLS_TTL_PROP_DEFAULT; 2543 rt2->rt_nh->nh_via_table = NEIGH_LINK_TABLE; 2544 rt2->rt_nh->nh_via_alen = lo->addr_len; 2545 memcpy(__mpls_nh_via(rt2, rt2->rt_nh), lo->dev_addr, 2546 lo->addr_len); 2547 } 2548 2549 rtnl_lock(); 2550 /* Remember the original table */ 2551 old = rtnl_dereference(net->mpls.platform_label); 2552 old_limit = net->mpls.platform_labels; 2553 2554 /* Free any labels beyond the new table */ 2555 for (index = limit; index < old_limit; index++) 2556 mpls_route_update(net, index, NULL, NULL); 2557 2558 /* Copy over the old labels */ 2559 cp_size = size; 2560 if (old_limit < limit) 2561 cp_size = old_limit * sizeof(struct mpls_route *); 2562 2563 memcpy(labels, old, cp_size); 2564 2565 /* If needed set the predefined labels */ 2566 if ((old_limit <= MPLS_LABEL_IPV6NULL) && 2567 (limit > MPLS_LABEL_IPV6NULL)) { 2568 RCU_INIT_POINTER(labels[MPLS_LABEL_IPV6NULL], rt2); 2569 rt2 = NULL; 2570 } 2571 2572 if ((old_limit <= MPLS_LABEL_IPV4NULL) && 2573 (limit > MPLS_LABEL_IPV4NULL)) { 2574 RCU_INIT_POINTER(labels[MPLS_LABEL_IPV4NULL], rt0); 2575 rt0 = NULL; 2576 } 2577 2578 /* Update the global pointers */ 2579 net->mpls.platform_labels = limit; 2580 rcu_assign_pointer(net->mpls.platform_label, labels); 2581 2582 rtnl_unlock(); 2583 2584 mpls_rt_free(rt2); 2585 mpls_rt_free(rt0); 2586 2587 if (old) { 2588 synchronize_rcu(); 2589 kvfree(old); 2590 } 2591 return 0; 2592 2593 nort2: 2594 mpls_rt_free(rt0); 2595 nort0: 2596 kvfree(labels); 2597 nolabels: 2598 return -ENOMEM; 2599 } 2600 2601 static int mpls_platform_labels(const struct ctl_table *table, int write, 2602 void *buffer, size_t *lenp, loff_t *ppos) 2603 { 2604 struct net *net = table->data; 2605 int platform_labels = net->mpls.platform_labels; 2606 int ret; 2607 struct ctl_table tmp = { 2608 .procname = table->procname, 2609 .data = &platform_labels, 2610 .maxlen = sizeof(int), 2611 .mode = table->mode, 2612 .extra1 = SYSCTL_ZERO, 2613 .extra2 = &label_limit, 2614 }; 2615 2616 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); 2617 2618 if (write && ret == 0) 2619 ret = resize_platform_label_table(net, platform_labels); 2620 2621 return ret; 2622 } 2623 2624 #define MPLS_NS_SYSCTL_OFFSET(field) \ 2625 (&((struct net *)0)->field) 2626 2627 static const struct ctl_table mpls_table[] = { 2628 { 2629 .procname = "platform_labels", 2630 .data = NULL, 2631 .maxlen = sizeof(int), 2632 .mode = 0644, 2633 .proc_handler = mpls_platform_labels, 2634 }, 2635 { 2636 .procname = "ip_ttl_propagate", 2637 .data = MPLS_NS_SYSCTL_OFFSET(mpls.ip_ttl_propagate), 2638 .maxlen = sizeof(int), 2639 .mode = 0644, 2640 .proc_handler = proc_dointvec_minmax, 2641 .extra1 = SYSCTL_ZERO, 2642 .extra2 = SYSCTL_ONE, 2643 }, 2644 { 2645 .procname = "default_ttl", 2646 .data = MPLS_NS_SYSCTL_OFFSET(mpls.default_ttl), 2647 .maxlen = sizeof(int), 2648 .mode = 0644, 2649 .proc_handler = proc_dointvec_minmax, 2650 .extra1 = SYSCTL_ONE, 2651 .extra2 = &ttl_max, 2652 }, 2653 }; 2654 2655 static int mpls_net_init(struct net *net) 2656 { 2657 size_t table_size = ARRAY_SIZE(mpls_table); 2658 struct ctl_table *table; 2659 int i; 2660 2661 net->mpls.platform_labels = 0; 2662 net->mpls.platform_label = NULL; 2663 net->mpls.ip_ttl_propagate = 1; 2664 net->mpls.default_ttl = 255; 2665 2666 table = kmemdup(mpls_table, sizeof(mpls_table), GFP_KERNEL); 2667 if (table == NULL) 2668 return -ENOMEM; 2669 2670 /* Table data contains only offsets relative to the base of 2671 * the mdev at this point, so make them absolute. 2672 */ 2673 for (i = 0; i < table_size; i++) 2674 table[i].data = (char *)net + (uintptr_t)table[i].data; 2675 2676 net->mpls.ctl = register_net_sysctl_sz(net, "net/mpls", table, 2677 table_size); 2678 if (net->mpls.ctl == NULL) { 2679 kfree(table); 2680 return -ENOMEM; 2681 } 2682 2683 return 0; 2684 } 2685 2686 static void mpls_net_exit(struct net *net) 2687 { 2688 struct mpls_route __rcu **platform_label; 2689 size_t platform_labels; 2690 const struct ctl_table *table; 2691 unsigned int index; 2692 2693 table = net->mpls.ctl->ctl_table_arg; 2694 unregister_net_sysctl_table(net->mpls.ctl); 2695 kfree(table); 2696 2697 /* An rcu grace period has passed since there was a device in 2698 * the network namespace (and thus the last in flight packet) 2699 * left this network namespace. This is because 2700 * unregister_netdevice_many and netdev_run_todo has completed 2701 * for each network device that was in this network namespace. 2702 * 2703 * As such no additional rcu synchronization is necessary when 2704 * freeing the platform_label table. 2705 */ 2706 rtnl_lock(); 2707 platform_label = rtnl_dereference(net->mpls.platform_label); 2708 platform_labels = net->mpls.platform_labels; 2709 for (index = 0; index < platform_labels; index++) { 2710 struct mpls_route *rt = rtnl_dereference(platform_label[index]); 2711 RCU_INIT_POINTER(platform_label[index], NULL); 2712 mpls_notify_route(net, index, rt, NULL, NULL); 2713 mpls_rt_free(rt); 2714 } 2715 rtnl_unlock(); 2716 2717 kvfree(platform_label); 2718 } 2719 2720 static struct pernet_operations mpls_net_ops = { 2721 .init = mpls_net_init, 2722 .exit = mpls_net_exit, 2723 }; 2724 2725 static struct rtnl_af_ops mpls_af_ops __read_mostly = { 2726 .family = AF_MPLS, 2727 .fill_stats_af = mpls_fill_stats_af, 2728 .get_stats_af_size = mpls_get_stats_af_size, 2729 }; 2730 2731 static const struct rtnl_msg_handler mpls_rtnl_msg_handlers[] __initdata_or_module = { 2732 {THIS_MODULE, PF_MPLS, RTM_NEWROUTE, mpls_rtm_newroute, NULL, 0}, 2733 {THIS_MODULE, PF_MPLS, RTM_DELROUTE, mpls_rtm_delroute, NULL, 0}, 2734 {THIS_MODULE, PF_MPLS, RTM_GETROUTE, mpls_getroute, mpls_dump_routes, 0}, 2735 {THIS_MODULE, PF_MPLS, RTM_GETNETCONF, 2736 mpls_netconf_get_devconf, mpls_netconf_dump_devconf, 2737 RTNL_FLAG_DUMP_UNLOCKED}, 2738 }; 2739 2740 static int __init mpls_init(void) 2741 { 2742 int err; 2743 2744 BUILD_BUG_ON(sizeof(struct mpls_shim_hdr) != 4); 2745 2746 err = register_pernet_subsys(&mpls_net_ops); 2747 if (err) 2748 goto out; 2749 2750 err = register_netdevice_notifier(&mpls_dev_notifier); 2751 if (err) 2752 goto out_unregister_pernet; 2753 2754 dev_add_pack(&mpls_packet_type); 2755 2756 rtnl_af_register(&mpls_af_ops); 2757 2758 err = rtnl_register_many(mpls_rtnl_msg_handlers); 2759 if (err) 2760 goto out_unregister_rtnl_af; 2761 2762 err = ipgre_tunnel_encap_add_mpls_ops(); 2763 if (err) { 2764 pr_err("Can't add mpls over gre tunnel ops\n"); 2765 goto out_unregister_rtnl; 2766 } 2767 2768 err = 0; 2769 out: 2770 return err; 2771 2772 out_unregister_rtnl: 2773 rtnl_unregister_many(mpls_rtnl_msg_handlers); 2774 out_unregister_rtnl_af: 2775 rtnl_af_unregister(&mpls_af_ops); 2776 dev_remove_pack(&mpls_packet_type); 2777 out_unregister_pernet: 2778 unregister_pernet_subsys(&mpls_net_ops); 2779 goto out; 2780 } 2781 module_init(mpls_init); 2782 2783 static void __exit mpls_exit(void) 2784 { 2785 rtnl_unregister_all(PF_MPLS); 2786 rtnl_af_unregister(&mpls_af_ops); 2787 dev_remove_pack(&mpls_packet_type); 2788 unregister_netdevice_notifier(&mpls_dev_notifier); 2789 unregister_pernet_subsys(&mpls_net_ops); 2790 ipgre_tunnel_encap_del_mpls_ops(); 2791 } 2792 module_exit(mpls_exit); 2793 2794 MODULE_DESCRIPTION("MultiProtocol Label Switching"); 2795 MODULE_LICENSE("GPL v2"); 2796 MODULE_ALIAS_NETPROTO(PF_MPLS); 2797