1 // SPDX-License-Identifier: GPL-2.0-only 2 #include <linux/types.h> 3 #include <linux/skbuff.h> 4 #include <linux/socket.h> 5 #include <linux/sysctl.h> 6 #include <linux/net.h> 7 #include <linux/module.h> 8 #include <linux/if_arp.h> 9 #include <linux/ipv6.h> 10 #include <linux/mpls.h> 11 #include <linux/netconf.h> 12 #include <linux/nospec.h> 13 #include <linux/vmalloc.h> 14 #include <linux/percpu.h> 15 #include <net/ip.h> 16 #include <net/dst.h> 17 #include <net/sock.h> 18 #include <net/arp.h> 19 #include <net/ip_fib.h> 20 #include <net/netevent.h> 21 #include <net/ip_tunnels.h> 22 #include <net/netns/generic.h> 23 #if IS_ENABLED(CONFIG_IPV6) 24 #include <net/ipv6.h> 25 #endif 26 #include <net/ipv6_stubs.h> 27 #include <net/rtnh.h> 28 #include "internal.h" 29 30 /* max memory we will use for mpls_route */ 31 #define MAX_MPLS_ROUTE_MEM 4096 32 33 /* Maximum number of labels to look ahead at when selecting a path of 34 * a multipath route 35 */ 36 #define MAX_MP_SELECT_LABELS 4 37 38 #define MPLS_NEIGH_TABLE_UNSPEC (NEIGH_LINK_TABLE + 1) 39 40 static int label_limit = (1 << 20) - 1; 41 static int ttl_max = 255; 42 43 #if IS_ENABLED(CONFIG_NET_IP_TUNNEL) 44 static size_t ipgre_mpls_encap_hlen(struct ip_tunnel_encap *e) 45 { 46 return sizeof(struct mpls_shim_hdr); 47 } 48 49 static const struct ip_tunnel_encap_ops mpls_iptun_ops = { 50 .encap_hlen = ipgre_mpls_encap_hlen, 51 }; 52 53 static int ipgre_tunnel_encap_add_mpls_ops(void) 54 { 55 return ip_tunnel_encap_add_ops(&mpls_iptun_ops, TUNNEL_ENCAP_MPLS); 56 } 57 58 static void ipgre_tunnel_encap_del_mpls_ops(void) 59 { 60 ip_tunnel_encap_del_ops(&mpls_iptun_ops, TUNNEL_ENCAP_MPLS); 61 } 62 #else 63 static int ipgre_tunnel_encap_add_mpls_ops(void) 64 { 65 return 0; 66 } 67 68 static void ipgre_tunnel_encap_del_mpls_ops(void) 69 { 70 } 71 #endif 72 73 static void rtmsg_lfib(int event, u32 label, struct mpls_route *rt, 74 struct nlmsghdr *nlh, struct net *net, u32 portid, 75 unsigned int nlm_flags); 76 77 static struct mpls_route *mpls_route_input_rcu(struct net *net, unsigned index) 78 { 79 struct mpls_route *rt = NULL; 80 81 if (index < net->mpls.platform_labels) { 82 struct mpls_route __rcu **platform_label = 83 rcu_dereference(net->mpls.platform_label); 84 rt = rcu_dereference(platform_label[index]); 85 } 86 return rt; 87 } 88 89 bool mpls_output_possible(const struct net_device *dev) 90 { 91 return dev && (dev->flags & IFF_UP) && netif_carrier_ok(dev); 92 } 93 EXPORT_SYMBOL_GPL(mpls_output_possible); 94 95 static u8 *__mpls_nh_via(struct mpls_route *rt, struct mpls_nh *nh) 96 { 97 return (u8 *)nh + rt->rt_via_offset; 98 } 99 100 static const u8 *mpls_nh_via(const struct mpls_route *rt, 101 const struct mpls_nh *nh) 102 { 103 return __mpls_nh_via((struct mpls_route *)rt, (struct mpls_nh *)nh); 104 } 105 106 static unsigned int mpls_nh_header_size(const struct mpls_nh *nh) 107 { 108 /* The size of the layer 2.5 labels to be added for this route */ 109 return nh->nh_labels * sizeof(struct mpls_shim_hdr); 110 } 111 112 unsigned int mpls_dev_mtu(const struct net_device *dev) 113 { 114 /* The amount of data the layer 2 frame can hold */ 115 return dev->mtu; 116 } 117 EXPORT_SYMBOL_GPL(mpls_dev_mtu); 118 119 bool mpls_pkt_too_big(const struct sk_buff *skb, unsigned int mtu) 120 { 121 if (skb->len <= mtu) 122 return false; 123 124 if (skb_is_gso(skb) && skb_gso_validate_network_len(skb, mtu)) 125 return false; 126 127 return true; 128 } 129 EXPORT_SYMBOL_GPL(mpls_pkt_too_big); 130 131 void mpls_stats_inc_outucastpkts(struct net_device *dev, 132 const struct sk_buff *skb) 133 { 134 struct mpls_dev *mdev; 135 136 if (skb->protocol == htons(ETH_P_MPLS_UC)) { 137 mdev = mpls_dev_get(dev); 138 if (mdev) 139 MPLS_INC_STATS_LEN(mdev, skb->len, 140 tx_packets, 141 tx_bytes); 142 } else if (skb->protocol == htons(ETH_P_IP)) { 143 IP_UPD_PO_STATS(dev_net(dev), IPSTATS_MIB_OUT, skb->len); 144 #if IS_ENABLED(CONFIG_IPV6) 145 } else if (skb->protocol == htons(ETH_P_IPV6)) { 146 struct inet6_dev *in6dev = __in6_dev_get(dev); 147 148 if (in6dev) 149 IP6_UPD_PO_STATS(dev_net(dev), in6dev, 150 IPSTATS_MIB_OUT, skb->len); 151 #endif 152 } 153 } 154 EXPORT_SYMBOL_GPL(mpls_stats_inc_outucastpkts); 155 156 static u32 mpls_multipath_hash(struct mpls_route *rt, struct sk_buff *skb) 157 { 158 struct mpls_entry_decoded dec; 159 unsigned int mpls_hdr_len = 0; 160 struct mpls_shim_hdr *hdr; 161 bool eli_seen = false; 162 int label_index; 163 u32 hash = 0; 164 165 for (label_index = 0; label_index < MAX_MP_SELECT_LABELS; 166 label_index++) { 167 mpls_hdr_len += sizeof(*hdr); 168 if (!pskb_may_pull(skb, mpls_hdr_len)) 169 break; 170 171 /* Read and decode the current label */ 172 hdr = mpls_hdr(skb) + label_index; 173 dec = mpls_entry_decode(hdr); 174 175 /* RFC6790 - reserved labels MUST NOT be used as keys 176 * for the load-balancing function 177 */ 178 if (likely(dec.label >= MPLS_LABEL_FIRST_UNRESERVED)) { 179 hash = jhash_1word(dec.label, hash); 180 181 /* The entropy label follows the entropy label 182 * indicator, so this means that the entropy 183 * label was just added to the hash - no need to 184 * go any deeper either in the label stack or in the 185 * payload 186 */ 187 if (eli_seen) 188 break; 189 } else if (dec.label == MPLS_LABEL_ENTROPY) { 190 eli_seen = true; 191 } 192 193 if (!dec.bos) 194 continue; 195 196 /* found bottom label; does skb have room for a header? */ 197 if (pskb_may_pull(skb, mpls_hdr_len + sizeof(struct iphdr))) { 198 const struct iphdr *v4hdr; 199 200 v4hdr = (const struct iphdr *)(hdr + 1); 201 if (v4hdr->version == 4) { 202 hash = jhash_3words(ntohl(v4hdr->saddr), 203 ntohl(v4hdr->daddr), 204 v4hdr->protocol, hash); 205 } else if (v4hdr->version == 6 && 206 pskb_may_pull(skb, mpls_hdr_len + 207 sizeof(struct ipv6hdr))) { 208 const struct ipv6hdr *v6hdr; 209 210 v6hdr = (const struct ipv6hdr *)(hdr + 1); 211 hash = __ipv6_addr_jhash(&v6hdr->saddr, hash); 212 hash = __ipv6_addr_jhash(&v6hdr->daddr, hash); 213 hash = jhash_1word(v6hdr->nexthdr, hash); 214 } 215 } 216 217 break; 218 } 219 220 return hash; 221 } 222 223 static struct mpls_nh *mpls_get_nexthop(struct mpls_route *rt, u8 index) 224 { 225 return (struct mpls_nh *)((u8 *)rt->rt_nh + index * rt->rt_nh_size); 226 } 227 228 /* number of alive nexthops (rt->rt_nhn_alive) and the flags for 229 * a next hop (nh->nh_flags) are modified by netdev event handlers. 230 * Since those fields can change at any moment, use READ_ONCE to 231 * access both. 232 */ 233 static struct mpls_nh *mpls_select_multipath(struct mpls_route *rt, 234 struct sk_buff *skb) 235 { 236 u32 hash = 0; 237 int nh_index = 0; 238 int n = 0; 239 u8 alive; 240 241 /* No need to look further into packet if there's only 242 * one path 243 */ 244 if (rt->rt_nhn == 1) 245 return rt->rt_nh; 246 247 alive = READ_ONCE(rt->rt_nhn_alive); 248 if (alive == 0) 249 return NULL; 250 251 hash = mpls_multipath_hash(rt, skb); 252 nh_index = hash % alive; 253 if (alive == rt->rt_nhn) 254 goto out; 255 for_nexthops(rt) { 256 unsigned int nh_flags = READ_ONCE(nh->nh_flags); 257 258 if (nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)) 259 continue; 260 if (n == nh_index) 261 return nh; 262 n++; 263 } endfor_nexthops(rt); 264 265 out: 266 return mpls_get_nexthop(rt, nh_index); 267 } 268 269 static bool mpls_egress(struct net *net, struct mpls_route *rt, 270 struct sk_buff *skb, struct mpls_entry_decoded dec) 271 { 272 enum mpls_payload_type payload_type; 273 bool success = false; 274 275 /* The IPv4 code below accesses through the IPv4 header 276 * checksum, which is 12 bytes into the packet. 277 * The IPv6 code below accesses through the IPv6 hop limit 278 * which is 8 bytes into the packet. 279 * 280 * For all supported cases there should always be at least 12 281 * bytes of packet data present. The IPv4 header is 20 bytes 282 * without options and the IPv6 header is always 40 bytes 283 * long. 284 */ 285 if (!pskb_may_pull(skb, 12)) 286 return false; 287 288 payload_type = rt->rt_payload_type; 289 if (payload_type == MPT_UNSPEC) 290 payload_type = ip_hdr(skb)->version; 291 292 switch (payload_type) { 293 case MPT_IPV4: { 294 struct iphdr *hdr4 = ip_hdr(skb); 295 u8 new_ttl; 296 skb->protocol = htons(ETH_P_IP); 297 298 /* If propagating TTL, take the decremented TTL from 299 * the incoming MPLS header, otherwise decrement the 300 * TTL, but only if not 0 to avoid underflow. 301 */ 302 if (rt->rt_ttl_propagate == MPLS_TTL_PROP_ENABLED || 303 (rt->rt_ttl_propagate == MPLS_TTL_PROP_DEFAULT && 304 net->mpls.ip_ttl_propagate)) 305 new_ttl = dec.ttl; 306 else 307 new_ttl = hdr4->ttl ? hdr4->ttl - 1 : 0; 308 309 csum_replace2(&hdr4->check, 310 htons(hdr4->ttl << 8), 311 htons(new_ttl << 8)); 312 hdr4->ttl = new_ttl; 313 success = true; 314 break; 315 } 316 case MPT_IPV6: { 317 struct ipv6hdr *hdr6 = ipv6_hdr(skb); 318 skb->protocol = htons(ETH_P_IPV6); 319 320 /* If propagating TTL, take the decremented TTL from 321 * the incoming MPLS header, otherwise decrement the 322 * hop limit, but only if not 0 to avoid underflow. 323 */ 324 if (rt->rt_ttl_propagate == MPLS_TTL_PROP_ENABLED || 325 (rt->rt_ttl_propagate == MPLS_TTL_PROP_DEFAULT && 326 net->mpls.ip_ttl_propagate)) 327 hdr6->hop_limit = dec.ttl; 328 else if (hdr6->hop_limit) 329 hdr6->hop_limit = hdr6->hop_limit - 1; 330 success = true; 331 break; 332 } 333 case MPT_UNSPEC: 334 /* Should have decided which protocol it is by now */ 335 break; 336 } 337 338 return success; 339 } 340 341 static int mpls_forward(struct sk_buff *skb, struct net_device *dev, 342 struct packet_type *pt, struct net_device *orig_dev) 343 { 344 struct net *net = dev_net(dev); 345 struct mpls_shim_hdr *hdr; 346 struct mpls_route *rt; 347 struct mpls_nh *nh; 348 struct mpls_entry_decoded dec; 349 struct net_device *out_dev; 350 struct mpls_dev *out_mdev; 351 struct mpls_dev *mdev; 352 unsigned int hh_len; 353 unsigned int new_header_size; 354 unsigned int mtu; 355 int err; 356 357 /* Careful this entire function runs inside of an rcu critical section */ 358 359 mdev = mpls_dev_get(dev); 360 if (!mdev) 361 goto drop; 362 363 MPLS_INC_STATS_LEN(mdev, skb->len, rx_packets, 364 rx_bytes); 365 366 if (!mdev->input_enabled) { 367 MPLS_INC_STATS(mdev, rx_dropped); 368 goto drop; 369 } 370 371 if (skb->pkt_type != PACKET_HOST) 372 goto err; 373 374 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) 375 goto err; 376 377 if (!pskb_may_pull(skb, sizeof(*hdr))) 378 goto err; 379 380 /* Read and decode the label */ 381 hdr = mpls_hdr(skb); 382 dec = mpls_entry_decode(hdr); 383 384 rt = mpls_route_input_rcu(net, dec.label); 385 if (!rt) { 386 MPLS_INC_STATS(mdev, rx_noroute); 387 goto drop; 388 } 389 390 nh = mpls_select_multipath(rt, skb); 391 if (!nh) 392 goto err; 393 394 /* Pop the label */ 395 skb_pull(skb, sizeof(*hdr)); 396 skb_reset_network_header(skb); 397 398 skb_orphan(skb); 399 400 if (skb_warn_if_lro(skb)) 401 goto err; 402 403 skb_forward_csum(skb); 404 405 /* Verify ttl is valid */ 406 if (dec.ttl <= 1) 407 goto err; 408 dec.ttl -= 1; 409 410 /* Find the output device */ 411 out_dev = rcu_dereference(nh->nh_dev); 412 if (!mpls_output_possible(out_dev)) 413 goto tx_err; 414 415 /* Verify the destination can hold the packet */ 416 new_header_size = mpls_nh_header_size(nh); 417 mtu = mpls_dev_mtu(out_dev); 418 if (mpls_pkt_too_big(skb, mtu - new_header_size)) 419 goto tx_err; 420 421 hh_len = LL_RESERVED_SPACE(out_dev); 422 if (!out_dev->header_ops) 423 hh_len = 0; 424 425 /* Ensure there is enough space for the headers in the skb */ 426 if (skb_cow(skb, hh_len + new_header_size)) 427 goto tx_err; 428 429 skb->dev = out_dev; 430 skb->protocol = htons(ETH_P_MPLS_UC); 431 432 if (unlikely(!new_header_size && dec.bos)) { 433 /* Penultimate hop popping */ 434 if (!mpls_egress(dev_net(out_dev), rt, skb, dec)) 435 goto err; 436 } else { 437 bool bos; 438 int i; 439 skb_push(skb, new_header_size); 440 skb_reset_network_header(skb); 441 /* Push the new labels */ 442 hdr = mpls_hdr(skb); 443 bos = dec.bos; 444 for (i = nh->nh_labels - 1; i >= 0; i--) { 445 hdr[i] = mpls_entry_encode(nh->nh_label[i], 446 dec.ttl, 0, bos); 447 bos = false; 448 } 449 } 450 451 mpls_stats_inc_outucastpkts(out_dev, skb); 452 453 /* If via wasn't specified then send out using device address */ 454 if (nh->nh_via_table == MPLS_NEIGH_TABLE_UNSPEC) 455 err = neigh_xmit(NEIGH_LINK_TABLE, out_dev, 456 out_dev->dev_addr, skb); 457 else 458 err = neigh_xmit(nh->nh_via_table, out_dev, 459 mpls_nh_via(rt, nh), skb); 460 if (err) 461 net_dbg_ratelimited("%s: packet transmission failed: %d\n", 462 __func__, err); 463 return 0; 464 465 tx_err: 466 out_mdev = out_dev ? mpls_dev_get(out_dev) : NULL; 467 if (out_mdev) 468 MPLS_INC_STATS(out_mdev, tx_errors); 469 goto drop; 470 err: 471 MPLS_INC_STATS(mdev, rx_errors); 472 drop: 473 kfree_skb(skb); 474 return NET_RX_DROP; 475 } 476 477 static struct packet_type mpls_packet_type __read_mostly = { 478 .type = cpu_to_be16(ETH_P_MPLS_UC), 479 .func = mpls_forward, 480 }; 481 482 static const struct nla_policy rtm_mpls_policy[RTA_MAX+1] = { 483 [RTA_DST] = { .type = NLA_U32 }, 484 [RTA_OIF] = { .type = NLA_U32 }, 485 [RTA_TTL_PROPAGATE] = { .type = NLA_U8 }, 486 }; 487 488 struct mpls_route_config { 489 u32 rc_protocol; 490 u32 rc_ifindex; 491 u8 rc_via_table; 492 u8 rc_via_alen; 493 u8 rc_via[MAX_VIA_ALEN]; 494 u32 rc_label; 495 u8 rc_ttl_propagate; 496 u8 rc_output_labels; 497 u32 rc_output_label[MAX_NEW_LABELS]; 498 u32 rc_nlflags; 499 enum mpls_payload_type rc_payload_type; 500 struct nl_info rc_nlinfo; 501 struct rtnexthop *rc_mp; 502 int rc_mp_len; 503 }; 504 505 /* all nexthops within a route have the same size based on max 506 * number of labels and max via length for a hop 507 */ 508 static struct mpls_route *mpls_rt_alloc(u8 num_nh, u8 max_alen, u8 max_labels) 509 { 510 u8 nh_size = MPLS_NH_SIZE(max_labels, max_alen); 511 struct mpls_route *rt; 512 size_t size; 513 514 size = sizeof(*rt) + num_nh * nh_size; 515 if (size > MAX_MPLS_ROUTE_MEM) 516 return ERR_PTR(-EINVAL); 517 518 rt = kzalloc(size, GFP_KERNEL); 519 if (!rt) 520 return ERR_PTR(-ENOMEM); 521 522 rt->rt_nhn = num_nh; 523 rt->rt_nhn_alive = num_nh; 524 rt->rt_nh_size = nh_size; 525 rt->rt_via_offset = MPLS_NH_VIA_OFF(max_labels); 526 527 return rt; 528 } 529 530 static void mpls_rt_free(struct mpls_route *rt) 531 { 532 if (rt) 533 kfree_rcu(rt, rt_rcu); 534 } 535 536 static void mpls_notify_route(struct net *net, unsigned index, 537 struct mpls_route *old, struct mpls_route *new, 538 const struct nl_info *info) 539 { 540 struct nlmsghdr *nlh = info ? info->nlh : NULL; 541 unsigned portid = info ? info->portid : 0; 542 int event = new ? RTM_NEWROUTE : RTM_DELROUTE; 543 struct mpls_route *rt = new ? new : old; 544 unsigned nlm_flags = (old && new) ? NLM_F_REPLACE : 0; 545 /* Ignore reserved labels for now */ 546 if (rt && (index >= MPLS_LABEL_FIRST_UNRESERVED)) 547 rtmsg_lfib(event, index, rt, nlh, net, portid, nlm_flags); 548 } 549 550 static void mpls_route_update(struct net *net, unsigned index, 551 struct mpls_route *new, 552 const struct nl_info *info) 553 { 554 struct mpls_route __rcu **platform_label; 555 struct mpls_route *rt; 556 557 ASSERT_RTNL(); 558 559 platform_label = rtnl_dereference(net->mpls.platform_label); 560 rt = rtnl_dereference(platform_label[index]); 561 rcu_assign_pointer(platform_label[index], new); 562 563 mpls_notify_route(net, index, rt, new, info); 564 565 /* If we removed a route free it now */ 566 mpls_rt_free(rt); 567 } 568 569 static unsigned find_free_label(struct net *net) 570 { 571 struct mpls_route __rcu **platform_label; 572 size_t platform_labels; 573 unsigned index; 574 575 platform_label = rtnl_dereference(net->mpls.platform_label); 576 platform_labels = net->mpls.platform_labels; 577 for (index = MPLS_LABEL_FIRST_UNRESERVED; index < platform_labels; 578 index++) { 579 if (!rtnl_dereference(platform_label[index])) 580 return index; 581 } 582 return LABEL_NOT_SPECIFIED; 583 } 584 585 #if IS_ENABLED(CONFIG_INET) 586 static struct net_device *inet_fib_lookup_dev(struct net *net, 587 const void *addr) 588 { 589 struct net_device *dev; 590 struct rtable *rt; 591 struct in_addr daddr; 592 593 memcpy(&daddr, addr, sizeof(struct in_addr)); 594 rt = ip_route_output(net, daddr.s_addr, 0, 0, 0); 595 if (IS_ERR(rt)) 596 return ERR_CAST(rt); 597 598 dev = rt->dst.dev; 599 dev_hold(dev); 600 601 ip_rt_put(rt); 602 603 return dev; 604 } 605 #else 606 static struct net_device *inet_fib_lookup_dev(struct net *net, 607 const void *addr) 608 { 609 return ERR_PTR(-EAFNOSUPPORT); 610 } 611 #endif 612 613 #if IS_ENABLED(CONFIG_IPV6) 614 static struct net_device *inet6_fib_lookup_dev(struct net *net, 615 const void *addr) 616 { 617 struct net_device *dev; 618 struct dst_entry *dst; 619 struct flowi6 fl6; 620 int err; 621 622 if (!ipv6_stub) 623 return ERR_PTR(-EAFNOSUPPORT); 624 625 memset(&fl6, 0, sizeof(fl6)); 626 memcpy(&fl6.daddr, addr, sizeof(struct in6_addr)); 627 err = ipv6_stub->ipv6_dst_lookup(net, NULL, &dst, &fl6); 628 if (err) 629 return ERR_PTR(err); 630 631 dev = dst->dev; 632 dev_hold(dev); 633 dst_release(dst); 634 635 return dev; 636 } 637 #else 638 static struct net_device *inet6_fib_lookup_dev(struct net *net, 639 const void *addr) 640 { 641 return ERR_PTR(-EAFNOSUPPORT); 642 } 643 #endif 644 645 static struct net_device *find_outdev(struct net *net, 646 struct mpls_route *rt, 647 struct mpls_nh *nh, int oif) 648 { 649 struct net_device *dev = NULL; 650 651 if (!oif) { 652 switch (nh->nh_via_table) { 653 case NEIGH_ARP_TABLE: 654 dev = inet_fib_lookup_dev(net, mpls_nh_via(rt, nh)); 655 break; 656 case NEIGH_ND_TABLE: 657 dev = inet6_fib_lookup_dev(net, mpls_nh_via(rt, nh)); 658 break; 659 case NEIGH_LINK_TABLE: 660 break; 661 } 662 } else { 663 dev = dev_get_by_index(net, oif); 664 } 665 666 if (!dev) 667 return ERR_PTR(-ENODEV); 668 669 if (IS_ERR(dev)) 670 return dev; 671 672 /* The caller is holding rtnl anyways, so release the dev reference */ 673 dev_put(dev); 674 675 return dev; 676 } 677 678 static int mpls_nh_assign_dev(struct net *net, struct mpls_route *rt, 679 struct mpls_nh *nh, int oif) 680 { 681 struct net_device *dev = NULL; 682 int err = -ENODEV; 683 684 dev = find_outdev(net, rt, nh, oif); 685 if (IS_ERR(dev)) { 686 err = PTR_ERR(dev); 687 dev = NULL; 688 goto errout; 689 } 690 691 /* Ensure this is a supported device */ 692 err = -EINVAL; 693 if (!mpls_dev_get(dev)) 694 goto errout; 695 696 if ((nh->nh_via_table == NEIGH_LINK_TABLE) && 697 (dev->addr_len != nh->nh_via_alen)) 698 goto errout; 699 700 RCU_INIT_POINTER(nh->nh_dev, dev); 701 702 if (!(dev->flags & IFF_UP)) { 703 nh->nh_flags |= RTNH_F_DEAD; 704 } else { 705 unsigned int flags; 706 707 flags = dev_get_flags(dev); 708 if (!(flags & (IFF_RUNNING | IFF_LOWER_UP))) 709 nh->nh_flags |= RTNH_F_LINKDOWN; 710 } 711 712 return 0; 713 714 errout: 715 return err; 716 } 717 718 static int nla_get_via(const struct nlattr *nla, u8 *via_alen, u8 *via_table, 719 u8 via_addr[], struct netlink_ext_ack *extack) 720 { 721 struct rtvia *via = nla_data(nla); 722 int err = -EINVAL; 723 int alen; 724 725 if (nla_len(nla) < offsetof(struct rtvia, rtvia_addr)) { 726 NL_SET_ERR_MSG_ATTR(extack, nla, 727 "Invalid attribute length for RTA_VIA"); 728 goto errout; 729 } 730 alen = nla_len(nla) - 731 offsetof(struct rtvia, rtvia_addr); 732 if (alen > MAX_VIA_ALEN) { 733 NL_SET_ERR_MSG_ATTR(extack, nla, 734 "Invalid address length for RTA_VIA"); 735 goto errout; 736 } 737 738 /* Validate the address family */ 739 switch (via->rtvia_family) { 740 case AF_PACKET: 741 *via_table = NEIGH_LINK_TABLE; 742 break; 743 case AF_INET: 744 *via_table = NEIGH_ARP_TABLE; 745 if (alen != 4) 746 goto errout; 747 break; 748 case AF_INET6: 749 *via_table = NEIGH_ND_TABLE; 750 if (alen != 16) 751 goto errout; 752 break; 753 default: 754 /* Unsupported address family */ 755 goto errout; 756 } 757 758 memcpy(via_addr, via->rtvia_addr, alen); 759 *via_alen = alen; 760 err = 0; 761 762 errout: 763 return err; 764 } 765 766 static int mpls_nh_build_from_cfg(struct mpls_route_config *cfg, 767 struct mpls_route *rt) 768 { 769 struct net *net = cfg->rc_nlinfo.nl_net; 770 struct mpls_nh *nh = rt->rt_nh; 771 int err; 772 int i; 773 774 if (!nh) 775 return -ENOMEM; 776 777 nh->nh_labels = cfg->rc_output_labels; 778 for (i = 0; i < nh->nh_labels; i++) 779 nh->nh_label[i] = cfg->rc_output_label[i]; 780 781 nh->nh_via_table = cfg->rc_via_table; 782 memcpy(__mpls_nh_via(rt, nh), cfg->rc_via, cfg->rc_via_alen); 783 nh->nh_via_alen = cfg->rc_via_alen; 784 785 err = mpls_nh_assign_dev(net, rt, nh, cfg->rc_ifindex); 786 if (err) 787 goto errout; 788 789 if (nh->nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)) 790 rt->rt_nhn_alive--; 791 792 return 0; 793 794 errout: 795 return err; 796 } 797 798 static int mpls_nh_build(struct net *net, struct mpls_route *rt, 799 struct mpls_nh *nh, int oif, struct nlattr *via, 800 struct nlattr *newdst, u8 max_labels, 801 struct netlink_ext_ack *extack) 802 { 803 int err = -ENOMEM; 804 805 if (!nh) 806 goto errout; 807 808 if (newdst) { 809 err = nla_get_labels(newdst, max_labels, &nh->nh_labels, 810 nh->nh_label, extack); 811 if (err) 812 goto errout; 813 } 814 815 if (via) { 816 err = nla_get_via(via, &nh->nh_via_alen, &nh->nh_via_table, 817 __mpls_nh_via(rt, nh), extack); 818 if (err) 819 goto errout; 820 } else { 821 nh->nh_via_table = MPLS_NEIGH_TABLE_UNSPEC; 822 } 823 824 err = mpls_nh_assign_dev(net, rt, nh, oif); 825 if (err) 826 goto errout; 827 828 return 0; 829 830 errout: 831 return err; 832 } 833 834 static u8 mpls_count_nexthops(struct rtnexthop *rtnh, int len, 835 u8 cfg_via_alen, u8 *max_via_alen, 836 u8 *max_labels) 837 { 838 int remaining = len; 839 u8 nhs = 0; 840 841 *max_via_alen = 0; 842 *max_labels = 0; 843 844 while (rtnh_ok(rtnh, remaining)) { 845 struct nlattr *nla, *attrs = rtnh_attrs(rtnh); 846 int attrlen; 847 u8 n_labels = 0; 848 849 attrlen = rtnh_attrlen(rtnh); 850 nla = nla_find(attrs, attrlen, RTA_VIA); 851 if (nla && nla_len(nla) >= 852 offsetof(struct rtvia, rtvia_addr)) { 853 int via_alen = nla_len(nla) - 854 offsetof(struct rtvia, rtvia_addr); 855 856 if (via_alen <= MAX_VIA_ALEN) 857 *max_via_alen = max_t(u16, *max_via_alen, 858 via_alen); 859 } 860 861 nla = nla_find(attrs, attrlen, RTA_NEWDST); 862 if (nla && 863 nla_get_labels(nla, MAX_NEW_LABELS, &n_labels, 864 NULL, NULL) != 0) 865 return 0; 866 867 *max_labels = max_t(u8, *max_labels, n_labels); 868 869 /* number of nexthops is tracked by a u8. 870 * Check for overflow. 871 */ 872 if (nhs == 255) 873 return 0; 874 nhs++; 875 876 rtnh = rtnh_next(rtnh, &remaining); 877 } 878 879 /* leftover implies invalid nexthop configuration, discard it */ 880 return remaining > 0 ? 0 : nhs; 881 } 882 883 static int mpls_nh_build_multi(struct mpls_route_config *cfg, 884 struct mpls_route *rt, u8 max_labels, 885 struct netlink_ext_ack *extack) 886 { 887 struct rtnexthop *rtnh = cfg->rc_mp; 888 struct nlattr *nla_via, *nla_newdst; 889 int remaining = cfg->rc_mp_len; 890 int err = 0; 891 u8 nhs = 0; 892 893 change_nexthops(rt) { 894 int attrlen; 895 896 nla_via = NULL; 897 nla_newdst = NULL; 898 899 err = -EINVAL; 900 if (!rtnh_ok(rtnh, remaining)) 901 goto errout; 902 903 /* neither weighted multipath nor any flags 904 * are supported 905 */ 906 if (rtnh->rtnh_hops || rtnh->rtnh_flags) 907 goto errout; 908 909 attrlen = rtnh_attrlen(rtnh); 910 if (attrlen > 0) { 911 struct nlattr *attrs = rtnh_attrs(rtnh); 912 913 nla_via = nla_find(attrs, attrlen, RTA_VIA); 914 nla_newdst = nla_find(attrs, attrlen, RTA_NEWDST); 915 } 916 917 err = mpls_nh_build(cfg->rc_nlinfo.nl_net, rt, nh, 918 rtnh->rtnh_ifindex, nla_via, nla_newdst, 919 max_labels, extack); 920 if (err) 921 goto errout; 922 923 if (nh->nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)) 924 rt->rt_nhn_alive--; 925 926 rtnh = rtnh_next(rtnh, &remaining); 927 nhs++; 928 } endfor_nexthops(rt); 929 930 rt->rt_nhn = nhs; 931 932 return 0; 933 934 errout: 935 return err; 936 } 937 938 static bool mpls_label_ok(struct net *net, unsigned int *index, 939 struct netlink_ext_ack *extack) 940 { 941 bool is_ok = true; 942 943 /* Reserved labels may not be set */ 944 if (*index < MPLS_LABEL_FIRST_UNRESERVED) { 945 NL_SET_ERR_MSG(extack, 946 "Invalid label - must be MPLS_LABEL_FIRST_UNRESERVED or higher"); 947 is_ok = false; 948 } 949 950 /* The full 20 bit range may not be supported. */ 951 if (is_ok && *index >= net->mpls.platform_labels) { 952 NL_SET_ERR_MSG(extack, 953 "Label >= configured maximum in platform_labels"); 954 is_ok = false; 955 } 956 957 *index = array_index_nospec(*index, net->mpls.platform_labels); 958 return is_ok; 959 } 960 961 static int mpls_route_add(struct mpls_route_config *cfg, 962 struct netlink_ext_ack *extack) 963 { 964 struct mpls_route __rcu **platform_label; 965 struct net *net = cfg->rc_nlinfo.nl_net; 966 struct mpls_route *rt, *old; 967 int err = -EINVAL; 968 u8 max_via_alen; 969 unsigned index; 970 u8 max_labels; 971 u8 nhs; 972 973 index = cfg->rc_label; 974 975 /* If a label was not specified during insert pick one */ 976 if ((index == LABEL_NOT_SPECIFIED) && 977 (cfg->rc_nlflags & NLM_F_CREATE)) { 978 index = find_free_label(net); 979 } 980 981 if (!mpls_label_ok(net, &index, extack)) 982 goto errout; 983 984 /* Append makes no sense with mpls */ 985 err = -EOPNOTSUPP; 986 if (cfg->rc_nlflags & NLM_F_APPEND) { 987 NL_SET_ERR_MSG(extack, "MPLS does not support route append"); 988 goto errout; 989 } 990 991 err = -EEXIST; 992 platform_label = rtnl_dereference(net->mpls.platform_label); 993 old = rtnl_dereference(platform_label[index]); 994 if ((cfg->rc_nlflags & NLM_F_EXCL) && old) 995 goto errout; 996 997 err = -EEXIST; 998 if (!(cfg->rc_nlflags & NLM_F_REPLACE) && old) 999 goto errout; 1000 1001 err = -ENOENT; 1002 if (!(cfg->rc_nlflags & NLM_F_CREATE) && !old) 1003 goto errout; 1004 1005 err = -EINVAL; 1006 if (cfg->rc_mp) { 1007 nhs = mpls_count_nexthops(cfg->rc_mp, cfg->rc_mp_len, 1008 cfg->rc_via_alen, &max_via_alen, 1009 &max_labels); 1010 } else { 1011 max_via_alen = cfg->rc_via_alen; 1012 max_labels = cfg->rc_output_labels; 1013 nhs = 1; 1014 } 1015 1016 if (nhs == 0) { 1017 NL_SET_ERR_MSG(extack, "Route does not contain a nexthop"); 1018 goto errout; 1019 } 1020 1021 err = -ENOMEM; 1022 rt = mpls_rt_alloc(nhs, max_via_alen, max_labels); 1023 if (IS_ERR(rt)) { 1024 err = PTR_ERR(rt); 1025 goto errout; 1026 } 1027 1028 rt->rt_protocol = cfg->rc_protocol; 1029 rt->rt_payload_type = cfg->rc_payload_type; 1030 rt->rt_ttl_propagate = cfg->rc_ttl_propagate; 1031 1032 if (cfg->rc_mp) 1033 err = mpls_nh_build_multi(cfg, rt, max_labels, extack); 1034 else 1035 err = mpls_nh_build_from_cfg(cfg, rt); 1036 if (err) 1037 goto freert; 1038 1039 mpls_route_update(net, index, rt, &cfg->rc_nlinfo); 1040 1041 return 0; 1042 1043 freert: 1044 mpls_rt_free(rt); 1045 errout: 1046 return err; 1047 } 1048 1049 static int mpls_route_del(struct mpls_route_config *cfg, 1050 struct netlink_ext_ack *extack) 1051 { 1052 struct net *net = cfg->rc_nlinfo.nl_net; 1053 unsigned index; 1054 int err = -EINVAL; 1055 1056 index = cfg->rc_label; 1057 1058 if (!mpls_label_ok(net, &index, extack)) 1059 goto errout; 1060 1061 mpls_route_update(net, index, NULL, &cfg->rc_nlinfo); 1062 1063 err = 0; 1064 errout: 1065 return err; 1066 } 1067 1068 static void mpls_get_stats(struct mpls_dev *mdev, 1069 struct mpls_link_stats *stats) 1070 { 1071 struct mpls_pcpu_stats *p; 1072 int i; 1073 1074 memset(stats, 0, sizeof(*stats)); 1075 1076 for_each_possible_cpu(i) { 1077 struct mpls_link_stats local; 1078 unsigned int start; 1079 1080 p = per_cpu_ptr(mdev->stats, i); 1081 do { 1082 start = u64_stats_fetch_begin(&p->syncp); 1083 local = p->stats; 1084 } while (u64_stats_fetch_retry(&p->syncp, start)); 1085 1086 stats->rx_packets += local.rx_packets; 1087 stats->rx_bytes += local.rx_bytes; 1088 stats->tx_packets += local.tx_packets; 1089 stats->tx_bytes += local.tx_bytes; 1090 stats->rx_errors += local.rx_errors; 1091 stats->tx_errors += local.tx_errors; 1092 stats->rx_dropped += local.rx_dropped; 1093 stats->tx_dropped += local.tx_dropped; 1094 stats->rx_noroute += local.rx_noroute; 1095 } 1096 } 1097 1098 static int mpls_fill_stats_af(struct sk_buff *skb, 1099 const struct net_device *dev) 1100 { 1101 struct mpls_link_stats *stats; 1102 struct mpls_dev *mdev; 1103 struct nlattr *nla; 1104 1105 mdev = mpls_dev_get(dev); 1106 if (!mdev) 1107 return -ENODATA; 1108 1109 nla = nla_reserve_64bit(skb, MPLS_STATS_LINK, 1110 sizeof(struct mpls_link_stats), 1111 MPLS_STATS_UNSPEC); 1112 if (!nla) 1113 return -EMSGSIZE; 1114 1115 stats = nla_data(nla); 1116 mpls_get_stats(mdev, stats); 1117 1118 return 0; 1119 } 1120 1121 static size_t mpls_get_stats_af_size(const struct net_device *dev) 1122 { 1123 struct mpls_dev *mdev; 1124 1125 mdev = mpls_dev_get(dev); 1126 if (!mdev) 1127 return 0; 1128 1129 return nla_total_size_64bit(sizeof(struct mpls_link_stats)); 1130 } 1131 1132 static int mpls_netconf_fill_devconf(struct sk_buff *skb, struct mpls_dev *mdev, 1133 u32 portid, u32 seq, int event, 1134 unsigned int flags, int type) 1135 { 1136 struct nlmsghdr *nlh; 1137 struct netconfmsg *ncm; 1138 bool all = false; 1139 1140 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 1141 flags); 1142 if (!nlh) 1143 return -EMSGSIZE; 1144 1145 if (type == NETCONFA_ALL) 1146 all = true; 1147 1148 ncm = nlmsg_data(nlh); 1149 ncm->ncm_family = AF_MPLS; 1150 1151 if (nla_put_s32(skb, NETCONFA_IFINDEX, mdev->dev->ifindex) < 0) 1152 goto nla_put_failure; 1153 1154 if ((all || type == NETCONFA_INPUT) && 1155 nla_put_s32(skb, NETCONFA_INPUT, 1156 mdev->input_enabled) < 0) 1157 goto nla_put_failure; 1158 1159 nlmsg_end(skb, nlh); 1160 return 0; 1161 1162 nla_put_failure: 1163 nlmsg_cancel(skb, nlh); 1164 return -EMSGSIZE; 1165 } 1166 1167 static int mpls_netconf_msgsize_devconf(int type) 1168 { 1169 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 1170 + nla_total_size(4); /* NETCONFA_IFINDEX */ 1171 bool all = false; 1172 1173 if (type == NETCONFA_ALL) 1174 all = true; 1175 1176 if (all || type == NETCONFA_INPUT) 1177 size += nla_total_size(4); 1178 1179 return size; 1180 } 1181 1182 static void mpls_netconf_notify_devconf(struct net *net, int event, 1183 int type, struct mpls_dev *mdev) 1184 { 1185 struct sk_buff *skb; 1186 int err = -ENOBUFS; 1187 1188 skb = nlmsg_new(mpls_netconf_msgsize_devconf(type), GFP_KERNEL); 1189 if (!skb) 1190 goto errout; 1191 1192 err = mpls_netconf_fill_devconf(skb, mdev, 0, 0, event, 0, type); 1193 if (err < 0) { 1194 /* -EMSGSIZE implies BUG in mpls_netconf_msgsize_devconf() */ 1195 WARN_ON(err == -EMSGSIZE); 1196 kfree_skb(skb); 1197 goto errout; 1198 } 1199 1200 rtnl_notify(skb, net, 0, RTNLGRP_MPLS_NETCONF, NULL, GFP_KERNEL); 1201 return; 1202 errout: 1203 if (err < 0) 1204 rtnl_set_sk_err(net, RTNLGRP_MPLS_NETCONF, err); 1205 } 1206 1207 static const struct nla_policy devconf_mpls_policy[NETCONFA_MAX + 1] = { 1208 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 1209 }; 1210 1211 static int mpls_netconf_valid_get_req(struct sk_buff *skb, 1212 const struct nlmsghdr *nlh, 1213 struct nlattr **tb, 1214 struct netlink_ext_ack *extack) 1215 { 1216 int i, err; 1217 1218 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) { 1219 NL_SET_ERR_MSG_MOD(extack, 1220 "Invalid header for netconf get request"); 1221 return -EINVAL; 1222 } 1223 1224 if (!netlink_strict_get_check(skb)) 1225 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg), 1226 tb, NETCONFA_MAX, 1227 devconf_mpls_policy, extack); 1228 1229 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg), 1230 tb, NETCONFA_MAX, 1231 devconf_mpls_policy, extack); 1232 if (err) 1233 return err; 1234 1235 for (i = 0; i <= NETCONFA_MAX; i++) { 1236 if (!tb[i]) 1237 continue; 1238 1239 switch (i) { 1240 case NETCONFA_IFINDEX: 1241 break; 1242 default: 1243 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request"); 1244 return -EINVAL; 1245 } 1246 } 1247 1248 return 0; 1249 } 1250 1251 static int mpls_netconf_get_devconf(struct sk_buff *in_skb, 1252 struct nlmsghdr *nlh, 1253 struct netlink_ext_ack *extack) 1254 { 1255 struct net *net = sock_net(in_skb->sk); 1256 struct nlattr *tb[NETCONFA_MAX + 1]; 1257 struct net_device *dev; 1258 struct mpls_dev *mdev; 1259 struct sk_buff *skb; 1260 int ifindex; 1261 int err; 1262 1263 err = mpls_netconf_valid_get_req(in_skb, nlh, tb, extack); 1264 if (err < 0) 1265 goto errout; 1266 1267 err = -EINVAL; 1268 if (!tb[NETCONFA_IFINDEX]) 1269 goto errout; 1270 1271 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 1272 dev = __dev_get_by_index(net, ifindex); 1273 if (!dev) 1274 goto errout; 1275 1276 mdev = mpls_dev_get(dev); 1277 if (!mdev) 1278 goto errout; 1279 1280 err = -ENOBUFS; 1281 skb = nlmsg_new(mpls_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL); 1282 if (!skb) 1283 goto errout; 1284 1285 err = mpls_netconf_fill_devconf(skb, mdev, 1286 NETLINK_CB(in_skb).portid, 1287 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 1288 NETCONFA_ALL); 1289 if (err < 0) { 1290 /* -EMSGSIZE implies BUG in mpls_netconf_msgsize_devconf() */ 1291 WARN_ON(err == -EMSGSIZE); 1292 kfree_skb(skb); 1293 goto errout; 1294 } 1295 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 1296 errout: 1297 return err; 1298 } 1299 1300 static int mpls_netconf_dump_devconf(struct sk_buff *skb, 1301 struct netlink_callback *cb) 1302 { 1303 const struct nlmsghdr *nlh = cb->nlh; 1304 struct net *net = sock_net(skb->sk); 1305 struct hlist_head *head; 1306 struct net_device *dev; 1307 struct mpls_dev *mdev; 1308 int idx, s_idx; 1309 int h, s_h; 1310 1311 if (cb->strict_check) { 1312 struct netlink_ext_ack *extack = cb->extack; 1313 struct netconfmsg *ncm; 1314 1315 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) { 1316 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request"); 1317 return -EINVAL; 1318 } 1319 1320 if (nlmsg_attrlen(nlh, sizeof(*ncm))) { 1321 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request"); 1322 return -EINVAL; 1323 } 1324 } 1325 1326 s_h = cb->args[0]; 1327 s_idx = idx = cb->args[1]; 1328 1329 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 1330 idx = 0; 1331 head = &net->dev_index_head[h]; 1332 rcu_read_lock(); 1333 cb->seq = net->dev_base_seq; 1334 hlist_for_each_entry_rcu(dev, head, index_hlist) { 1335 if (idx < s_idx) 1336 goto cont; 1337 mdev = mpls_dev_get(dev); 1338 if (!mdev) 1339 goto cont; 1340 if (mpls_netconf_fill_devconf(skb, mdev, 1341 NETLINK_CB(cb->skb).portid, 1342 nlh->nlmsg_seq, 1343 RTM_NEWNETCONF, 1344 NLM_F_MULTI, 1345 NETCONFA_ALL) < 0) { 1346 rcu_read_unlock(); 1347 goto done; 1348 } 1349 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 1350 cont: 1351 idx++; 1352 } 1353 rcu_read_unlock(); 1354 } 1355 done: 1356 cb->args[0] = h; 1357 cb->args[1] = idx; 1358 1359 return skb->len; 1360 } 1361 1362 #define MPLS_PERDEV_SYSCTL_OFFSET(field) \ 1363 (&((struct mpls_dev *)0)->field) 1364 1365 static int mpls_conf_proc(struct ctl_table *ctl, int write, 1366 void __user *buffer, 1367 size_t *lenp, loff_t *ppos) 1368 { 1369 int oval = *(int *)ctl->data; 1370 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 1371 1372 if (write) { 1373 struct mpls_dev *mdev = ctl->extra1; 1374 int i = (int *)ctl->data - (int *)mdev; 1375 struct net *net = ctl->extra2; 1376 int val = *(int *)ctl->data; 1377 1378 if (i == offsetof(struct mpls_dev, input_enabled) && 1379 val != oval) { 1380 mpls_netconf_notify_devconf(net, RTM_NEWNETCONF, 1381 NETCONFA_INPUT, mdev); 1382 } 1383 } 1384 1385 return ret; 1386 } 1387 1388 static const struct ctl_table mpls_dev_table[] = { 1389 { 1390 .procname = "input", 1391 .maxlen = sizeof(int), 1392 .mode = 0644, 1393 .proc_handler = mpls_conf_proc, 1394 .data = MPLS_PERDEV_SYSCTL_OFFSET(input_enabled), 1395 }, 1396 { } 1397 }; 1398 1399 static int mpls_dev_sysctl_register(struct net_device *dev, 1400 struct mpls_dev *mdev) 1401 { 1402 char path[sizeof("net/mpls/conf/") + IFNAMSIZ]; 1403 struct net *net = dev_net(dev); 1404 struct ctl_table *table; 1405 int i; 1406 1407 table = kmemdup(&mpls_dev_table, sizeof(mpls_dev_table), GFP_KERNEL); 1408 if (!table) 1409 goto out; 1410 1411 /* Table data contains only offsets relative to the base of 1412 * the mdev at this point, so make them absolute. 1413 */ 1414 for (i = 0; i < ARRAY_SIZE(mpls_dev_table); i++) { 1415 table[i].data = (char *)mdev + (uintptr_t)table[i].data; 1416 table[i].extra1 = mdev; 1417 table[i].extra2 = net; 1418 } 1419 1420 snprintf(path, sizeof(path), "net/mpls/conf/%s", dev->name); 1421 1422 mdev->sysctl = register_net_sysctl(net, path, table); 1423 if (!mdev->sysctl) 1424 goto free; 1425 1426 mpls_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, mdev); 1427 return 0; 1428 1429 free: 1430 kfree(table); 1431 out: 1432 return -ENOBUFS; 1433 } 1434 1435 static void mpls_dev_sysctl_unregister(struct net_device *dev, 1436 struct mpls_dev *mdev) 1437 { 1438 struct net *net = dev_net(dev); 1439 struct ctl_table *table; 1440 1441 table = mdev->sysctl->ctl_table_arg; 1442 unregister_net_sysctl_table(mdev->sysctl); 1443 kfree(table); 1444 1445 mpls_netconf_notify_devconf(net, RTM_DELNETCONF, 0, mdev); 1446 } 1447 1448 static struct mpls_dev *mpls_add_dev(struct net_device *dev) 1449 { 1450 struct mpls_dev *mdev; 1451 int err = -ENOMEM; 1452 int i; 1453 1454 ASSERT_RTNL(); 1455 1456 mdev = kzalloc(sizeof(*mdev), GFP_KERNEL); 1457 if (!mdev) 1458 return ERR_PTR(err); 1459 1460 mdev->stats = alloc_percpu(struct mpls_pcpu_stats); 1461 if (!mdev->stats) 1462 goto free; 1463 1464 for_each_possible_cpu(i) { 1465 struct mpls_pcpu_stats *mpls_stats; 1466 1467 mpls_stats = per_cpu_ptr(mdev->stats, i); 1468 u64_stats_init(&mpls_stats->syncp); 1469 } 1470 1471 mdev->dev = dev; 1472 1473 err = mpls_dev_sysctl_register(dev, mdev); 1474 if (err) 1475 goto free; 1476 1477 rcu_assign_pointer(dev->mpls_ptr, mdev); 1478 1479 return mdev; 1480 1481 free: 1482 free_percpu(mdev->stats); 1483 kfree(mdev); 1484 return ERR_PTR(err); 1485 } 1486 1487 static void mpls_dev_destroy_rcu(struct rcu_head *head) 1488 { 1489 struct mpls_dev *mdev = container_of(head, struct mpls_dev, rcu); 1490 1491 free_percpu(mdev->stats); 1492 kfree(mdev); 1493 } 1494 1495 static void mpls_ifdown(struct net_device *dev, int event) 1496 { 1497 struct mpls_route __rcu **platform_label; 1498 struct net *net = dev_net(dev); 1499 u8 alive, deleted; 1500 unsigned index; 1501 1502 platform_label = rtnl_dereference(net->mpls.platform_label); 1503 for (index = 0; index < net->mpls.platform_labels; index++) { 1504 struct mpls_route *rt = rtnl_dereference(platform_label[index]); 1505 1506 if (!rt) 1507 continue; 1508 1509 alive = 0; 1510 deleted = 0; 1511 change_nexthops(rt) { 1512 unsigned int nh_flags = nh->nh_flags; 1513 1514 if (rtnl_dereference(nh->nh_dev) != dev) 1515 goto next; 1516 1517 switch (event) { 1518 case NETDEV_DOWN: 1519 case NETDEV_UNREGISTER: 1520 nh_flags |= RTNH_F_DEAD; 1521 /* fall through */ 1522 case NETDEV_CHANGE: 1523 nh_flags |= RTNH_F_LINKDOWN; 1524 break; 1525 } 1526 if (event == NETDEV_UNREGISTER) 1527 RCU_INIT_POINTER(nh->nh_dev, NULL); 1528 1529 if (nh->nh_flags != nh_flags) 1530 WRITE_ONCE(nh->nh_flags, nh_flags); 1531 next: 1532 if (!(nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN))) 1533 alive++; 1534 if (!rtnl_dereference(nh->nh_dev)) 1535 deleted++; 1536 } endfor_nexthops(rt); 1537 1538 WRITE_ONCE(rt->rt_nhn_alive, alive); 1539 1540 /* if there are no more nexthops, delete the route */ 1541 if (event == NETDEV_UNREGISTER && deleted == rt->rt_nhn) 1542 mpls_route_update(net, index, NULL, NULL); 1543 } 1544 } 1545 1546 static void mpls_ifup(struct net_device *dev, unsigned int flags) 1547 { 1548 struct mpls_route __rcu **platform_label; 1549 struct net *net = dev_net(dev); 1550 unsigned index; 1551 u8 alive; 1552 1553 platform_label = rtnl_dereference(net->mpls.platform_label); 1554 for (index = 0; index < net->mpls.platform_labels; index++) { 1555 struct mpls_route *rt = rtnl_dereference(platform_label[index]); 1556 1557 if (!rt) 1558 continue; 1559 1560 alive = 0; 1561 change_nexthops(rt) { 1562 unsigned int nh_flags = nh->nh_flags; 1563 struct net_device *nh_dev = 1564 rtnl_dereference(nh->nh_dev); 1565 1566 if (!(nh_flags & flags)) { 1567 alive++; 1568 continue; 1569 } 1570 if (nh_dev != dev) 1571 continue; 1572 alive++; 1573 nh_flags &= ~flags; 1574 WRITE_ONCE(nh->nh_flags, nh_flags); 1575 } endfor_nexthops(rt); 1576 1577 WRITE_ONCE(rt->rt_nhn_alive, alive); 1578 } 1579 } 1580 1581 static int mpls_dev_notify(struct notifier_block *this, unsigned long event, 1582 void *ptr) 1583 { 1584 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1585 struct mpls_dev *mdev; 1586 unsigned int flags; 1587 1588 if (event == NETDEV_REGISTER) { 1589 1590 /* For now just support Ethernet, IPGRE, IP6GRE, SIT and 1591 * IPIP devices 1592 */ 1593 if (dev->type == ARPHRD_ETHER || 1594 dev->type == ARPHRD_LOOPBACK || 1595 dev->type == ARPHRD_IPGRE || 1596 dev->type == ARPHRD_IP6GRE || 1597 dev->type == ARPHRD_SIT || 1598 dev->type == ARPHRD_TUNNEL) { 1599 mdev = mpls_add_dev(dev); 1600 if (IS_ERR(mdev)) 1601 return notifier_from_errno(PTR_ERR(mdev)); 1602 } 1603 return NOTIFY_OK; 1604 } 1605 1606 mdev = mpls_dev_get(dev); 1607 if (!mdev) 1608 return NOTIFY_OK; 1609 1610 switch (event) { 1611 case NETDEV_DOWN: 1612 mpls_ifdown(dev, event); 1613 break; 1614 case NETDEV_UP: 1615 flags = dev_get_flags(dev); 1616 if (flags & (IFF_RUNNING | IFF_LOWER_UP)) 1617 mpls_ifup(dev, RTNH_F_DEAD | RTNH_F_LINKDOWN); 1618 else 1619 mpls_ifup(dev, RTNH_F_DEAD); 1620 break; 1621 case NETDEV_CHANGE: 1622 flags = dev_get_flags(dev); 1623 if (flags & (IFF_RUNNING | IFF_LOWER_UP)) 1624 mpls_ifup(dev, RTNH_F_DEAD | RTNH_F_LINKDOWN); 1625 else 1626 mpls_ifdown(dev, event); 1627 break; 1628 case NETDEV_UNREGISTER: 1629 mpls_ifdown(dev, event); 1630 mdev = mpls_dev_get(dev); 1631 if (mdev) { 1632 mpls_dev_sysctl_unregister(dev, mdev); 1633 RCU_INIT_POINTER(dev->mpls_ptr, NULL); 1634 call_rcu(&mdev->rcu, mpls_dev_destroy_rcu); 1635 } 1636 break; 1637 case NETDEV_CHANGENAME: 1638 mdev = mpls_dev_get(dev); 1639 if (mdev) { 1640 int err; 1641 1642 mpls_dev_sysctl_unregister(dev, mdev); 1643 err = mpls_dev_sysctl_register(dev, mdev); 1644 if (err) 1645 return notifier_from_errno(err); 1646 } 1647 break; 1648 } 1649 return NOTIFY_OK; 1650 } 1651 1652 static struct notifier_block mpls_dev_notifier = { 1653 .notifier_call = mpls_dev_notify, 1654 }; 1655 1656 static int nla_put_via(struct sk_buff *skb, 1657 u8 table, const void *addr, int alen) 1658 { 1659 static const int table_to_family[NEIGH_NR_TABLES + 1] = { 1660 AF_INET, AF_INET6, AF_DECnet, AF_PACKET, 1661 }; 1662 struct nlattr *nla; 1663 struct rtvia *via; 1664 int family = AF_UNSPEC; 1665 1666 nla = nla_reserve(skb, RTA_VIA, alen + 2); 1667 if (!nla) 1668 return -EMSGSIZE; 1669 1670 if (table <= NEIGH_NR_TABLES) 1671 family = table_to_family[table]; 1672 1673 via = nla_data(nla); 1674 via->rtvia_family = family; 1675 memcpy(via->rtvia_addr, addr, alen); 1676 return 0; 1677 } 1678 1679 int nla_put_labels(struct sk_buff *skb, int attrtype, 1680 u8 labels, const u32 label[]) 1681 { 1682 struct nlattr *nla; 1683 struct mpls_shim_hdr *nla_label; 1684 bool bos; 1685 int i; 1686 nla = nla_reserve(skb, attrtype, labels*4); 1687 if (!nla) 1688 return -EMSGSIZE; 1689 1690 nla_label = nla_data(nla); 1691 bos = true; 1692 for (i = labels - 1; i >= 0; i--) { 1693 nla_label[i] = mpls_entry_encode(label[i], 0, 0, bos); 1694 bos = false; 1695 } 1696 1697 return 0; 1698 } 1699 EXPORT_SYMBOL_GPL(nla_put_labels); 1700 1701 int nla_get_labels(const struct nlattr *nla, u8 max_labels, u8 *labels, 1702 u32 label[], struct netlink_ext_ack *extack) 1703 { 1704 unsigned len = nla_len(nla); 1705 struct mpls_shim_hdr *nla_label; 1706 u8 nla_labels; 1707 bool bos; 1708 int i; 1709 1710 /* len needs to be an even multiple of 4 (the label size). Number 1711 * of labels is a u8 so check for overflow. 1712 */ 1713 if (len & 3 || len / 4 > 255) { 1714 NL_SET_ERR_MSG_ATTR(extack, nla, 1715 "Invalid length for labels attribute"); 1716 return -EINVAL; 1717 } 1718 1719 /* Limit the number of new labels allowed */ 1720 nla_labels = len/4; 1721 if (nla_labels > max_labels) { 1722 NL_SET_ERR_MSG(extack, "Too many labels"); 1723 return -EINVAL; 1724 } 1725 1726 /* when label == NULL, caller wants number of labels */ 1727 if (!label) 1728 goto out; 1729 1730 nla_label = nla_data(nla); 1731 bos = true; 1732 for (i = nla_labels - 1; i >= 0; i--, bos = false) { 1733 struct mpls_entry_decoded dec; 1734 dec = mpls_entry_decode(nla_label + i); 1735 1736 /* Ensure the bottom of stack flag is properly set 1737 * and ttl and tc are both clear. 1738 */ 1739 if (dec.ttl) { 1740 NL_SET_ERR_MSG_ATTR(extack, nla, 1741 "TTL in label must be 0"); 1742 return -EINVAL; 1743 } 1744 1745 if (dec.tc) { 1746 NL_SET_ERR_MSG_ATTR(extack, nla, 1747 "Traffic class in label must be 0"); 1748 return -EINVAL; 1749 } 1750 1751 if (dec.bos != bos) { 1752 NL_SET_BAD_ATTR(extack, nla); 1753 if (bos) { 1754 NL_SET_ERR_MSG(extack, 1755 "BOS bit must be set in first label"); 1756 } else { 1757 NL_SET_ERR_MSG(extack, 1758 "BOS bit can only be set in first label"); 1759 } 1760 return -EINVAL; 1761 } 1762 1763 switch (dec.label) { 1764 case MPLS_LABEL_IMPLNULL: 1765 /* RFC3032: This is a label that an LSR may 1766 * assign and distribute, but which never 1767 * actually appears in the encapsulation. 1768 */ 1769 NL_SET_ERR_MSG_ATTR(extack, nla, 1770 "Implicit NULL Label (3) can not be used in encapsulation"); 1771 return -EINVAL; 1772 } 1773 1774 label[i] = dec.label; 1775 } 1776 out: 1777 *labels = nla_labels; 1778 return 0; 1779 } 1780 EXPORT_SYMBOL_GPL(nla_get_labels); 1781 1782 static int rtm_to_route_config(struct sk_buff *skb, 1783 struct nlmsghdr *nlh, 1784 struct mpls_route_config *cfg, 1785 struct netlink_ext_ack *extack) 1786 { 1787 struct rtmsg *rtm; 1788 struct nlattr *tb[RTA_MAX+1]; 1789 int index; 1790 int err; 1791 1792 err = nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX, 1793 rtm_mpls_policy, extack); 1794 if (err < 0) 1795 goto errout; 1796 1797 err = -EINVAL; 1798 rtm = nlmsg_data(nlh); 1799 1800 if (rtm->rtm_family != AF_MPLS) { 1801 NL_SET_ERR_MSG(extack, "Invalid address family in rtmsg"); 1802 goto errout; 1803 } 1804 if (rtm->rtm_dst_len != 20) { 1805 NL_SET_ERR_MSG(extack, "rtm_dst_len must be 20 for MPLS"); 1806 goto errout; 1807 } 1808 if (rtm->rtm_src_len != 0) { 1809 NL_SET_ERR_MSG(extack, "rtm_src_len must be 0 for MPLS"); 1810 goto errout; 1811 } 1812 if (rtm->rtm_tos != 0) { 1813 NL_SET_ERR_MSG(extack, "rtm_tos must be 0 for MPLS"); 1814 goto errout; 1815 } 1816 if (rtm->rtm_table != RT_TABLE_MAIN) { 1817 NL_SET_ERR_MSG(extack, 1818 "MPLS only supports the main route table"); 1819 goto errout; 1820 } 1821 /* Any value is acceptable for rtm_protocol */ 1822 1823 /* As mpls uses destination specific addresses 1824 * (or source specific address in the case of multicast) 1825 * all addresses have universal scope. 1826 */ 1827 if (rtm->rtm_scope != RT_SCOPE_UNIVERSE) { 1828 NL_SET_ERR_MSG(extack, 1829 "Invalid route scope - MPLS only supports UNIVERSE"); 1830 goto errout; 1831 } 1832 if (rtm->rtm_type != RTN_UNICAST) { 1833 NL_SET_ERR_MSG(extack, 1834 "Invalid route type - MPLS only supports UNICAST"); 1835 goto errout; 1836 } 1837 if (rtm->rtm_flags != 0) { 1838 NL_SET_ERR_MSG(extack, "rtm_flags must be 0 for MPLS"); 1839 goto errout; 1840 } 1841 1842 cfg->rc_label = LABEL_NOT_SPECIFIED; 1843 cfg->rc_protocol = rtm->rtm_protocol; 1844 cfg->rc_via_table = MPLS_NEIGH_TABLE_UNSPEC; 1845 cfg->rc_ttl_propagate = MPLS_TTL_PROP_DEFAULT; 1846 cfg->rc_nlflags = nlh->nlmsg_flags; 1847 cfg->rc_nlinfo.portid = NETLINK_CB(skb).portid; 1848 cfg->rc_nlinfo.nlh = nlh; 1849 cfg->rc_nlinfo.nl_net = sock_net(skb->sk); 1850 1851 for (index = 0; index <= RTA_MAX; index++) { 1852 struct nlattr *nla = tb[index]; 1853 if (!nla) 1854 continue; 1855 1856 switch (index) { 1857 case RTA_OIF: 1858 cfg->rc_ifindex = nla_get_u32(nla); 1859 break; 1860 case RTA_NEWDST: 1861 if (nla_get_labels(nla, MAX_NEW_LABELS, 1862 &cfg->rc_output_labels, 1863 cfg->rc_output_label, extack)) 1864 goto errout; 1865 break; 1866 case RTA_DST: 1867 { 1868 u8 label_count; 1869 if (nla_get_labels(nla, 1, &label_count, 1870 &cfg->rc_label, extack)) 1871 goto errout; 1872 1873 if (!mpls_label_ok(cfg->rc_nlinfo.nl_net, 1874 &cfg->rc_label, extack)) 1875 goto errout; 1876 break; 1877 } 1878 case RTA_GATEWAY: 1879 NL_SET_ERR_MSG(extack, "MPLS does not support RTA_GATEWAY attribute"); 1880 goto errout; 1881 case RTA_VIA: 1882 { 1883 if (nla_get_via(nla, &cfg->rc_via_alen, 1884 &cfg->rc_via_table, cfg->rc_via, 1885 extack)) 1886 goto errout; 1887 break; 1888 } 1889 case RTA_MULTIPATH: 1890 { 1891 cfg->rc_mp = nla_data(nla); 1892 cfg->rc_mp_len = nla_len(nla); 1893 break; 1894 } 1895 case RTA_TTL_PROPAGATE: 1896 { 1897 u8 ttl_propagate = nla_get_u8(nla); 1898 1899 if (ttl_propagate > 1) { 1900 NL_SET_ERR_MSG_ATTR(extack, nla, 1901 "RTA_TTL_PROPAGATE can only be 0 or 1"); 1902 goto errout; 1903 } 1904 cfg->rc_ttl_propagate = ttl_propagate ? 1905 MPLS_TTL_PROP_ENABLED : 1906 MPLS_TTL_PROP_DISABLED; 1907 break; 1908 } 1909 default: 1910 NL_SET_ERR_MSG_ATTR(extack, nla, "Unknown attribute"); 1911 /* Unsupported attribute */ 1912 goto errout; 1913 } 1914 } 1915 1916 err = 0; 1917 errout: 1918 return err; 1919 } 1920 1921 static int mpls_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, 1922 struct netlink_ext_ack *extack) 1923 { 1924 struct mpls_route_config *cfg; 1925 int err; 1926 1927 cfg = kzalloc(sizeof(*cfg), GFP_KERNEL); 1928 if (!cfg) 1929 return -ENOMEM; 1930 1931 err = rtm_to_route_config(skb, nlh, cfg, extack); 1932 if (err < 0) 1933 goto out; 1934 1935 err = mpls_route_del(cfg, extack); 1936 out: 1937 kfree(cfg); 1938 1939 return err; 1940 } 1941 1942 1943 static int mpls_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, 1944 struct netlink_ext_ack *extack) 1945 { 1946 struct mpls_route_config *cfg; 1947 int err; 1948 1949 cfg = kzalloc(sizeof(*cfg), GFP_KERNEL); 1950 if (!cfg) 1951 return -ENOMEM; 1952 1953 err = rtm_to_route_config(skb, nlh, cfg, extack); 1954 if (err < 0) 1955 goto out; 1956 1957 err = mpls_route_add(cfg, extack); 1958 out: 1959 kfree(cfg); 1960 1961 return err; 1962 } 1963 1964 static int mpls_dump_route(struct sk_buff *skb, u32 portid, u32 seq, int event, 1965 u32 label, struct mpls_route *rt, int flags) 1966 { 1967 struct net_device *dev; 1968 struct nlmsghdr *nlh; 1969 struct rtmsg *rtm; 1970 1971 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*rtm), flags); 1972 if (nlh == NULL) 1973 return -EMSGSIZE; 1974 1975 rtm = nlmsg_data(nlh); 1976 rtm->rtm_family = AF_MPLS; 1977 rtm->rtm_dst_len = 20; 1978 rtm->rtm_src_len = 0; 1979 rtm->rtm_tos = 0; 1980 rtm->rtm_table = RT_TABLE_MAIN; 1981 rtm->rtm_protocol = rt->rt_protocol; 1982 rtm->rtm_scope = RT_SCOPE_UNIVERSE; 1983 rtm->rtm_type = RTN_UNICAST; 1984 rtm->rtm_flags = 0; 1985 1986 if (nla_put_labels(skb, RTA_DST, 1, &label)) 1987 goto nla_put_failure; 1988 1989 if (rt->rt_ttl_propagate != MPLS_TTL_PROP_DEFAULT) { 1990 bool ttl_propagate = 1991 rt->rt_ttl_propagate == MPLS_TTL_PROP_ENABLED; 1992 1993 if (nla_put_u8(skb, RTA_TTL_PROPAGATE, 1994 ttl_propagate)) 1995 goto nla_put_failure; 1996 } 1997 if (rt->rt_nhn == 1) { 1998 const struct mpls_nh *nh = rt->rt_nh; 1999 2000 if (nh->nh_labels && 2001 nla_put_labels(skb, RTA_NEWDST, nh->nh_labels, 2002 nh->nh_label)) 2003 goto nla_put_failure; 2004 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC && 2005 nla_put_via(skb, nh->nh_via_table, mpls_nh_via(rt, nh), 2006 nh->nh_via_alen)) 2007 goto nla_put_failure; 2008 dev = rtnl_dereference(nh->nh_dev); 2009 if (dev && nla_put_u32(skb, RTA_OIF, dev->ifindex)) 2010 goto nla_put_failure; 2011 if (nh->nh_flags & RTNH_F_LINKDOWN) 2012 rtm->rtm_flags |= RTNH_F_LINKDOWN; 2013 if (nh->nh_flags & RTNH_F_DEAD) 2014 rtm->rtm_flags |= RTNH_F_DEAD; 2015 } else { 2016 struct rtnexthop *rtnh; 2017 struct nlattr *mp; 2018 u8 linkdown = 0; 2019 u8 dead = 0; 2020 2021 mp = nla_nest_start_noflag(skb, RTA_MULTIPATH); 2022 if (!mp) 2023 goto nla_put_failure; 2024 2025 for_nexthops(rt) { 2026 dev = rtnl_dereference(nh->nh_dev); 2027 if (!dev) 2028 continue; 2029 2030 rtnh = nla_reserve_nohdr(skb, sizeof(*rtnh)); 2031 if (!rtnh) 2032 goto nla_put_failure; 2033 2034 rtnh->rtnh_ifindex = dev->ifindex; 2035 if (nh->nh_flags & RTNH_F_LINKDOWN) { 2036 rtnh->rtnh_flags |= RTNH_F_LINKDOWN; 2037 linkdown++; 2038 } 2039 if (nh->nh_flags & RTNH_F_DEAD) { 2040 rtnh->rtnh_flags |= RTNH_F_DEAD; 2041 dead++; 2042 } 2043 2044 if (nh->nh_labels && nla_put_labels(skb, RTA_NEWDST, 2045 nh->nh_labels, 2046 nh->nh_label)) 2047 goto nla_put_failure; 2048 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC && 2049 nla_put_via(skb, nh->nh_via_table, 2050 mpls_nh_via(rt, nh), 2051 nh->nh_via_alen)) 2052 goto nla_put_failure; 2053 2054 /* length of rtnetlink header + attributes */ 2055 rtnh->rtnh_len = nlmsg_get_pos(skb) - (void *)rtnh; 2056 } endfor_nexthops(rt); 2057 2058 if (linkdown == rt->rt_nhn) 2059 rtm->rtm_flags |= RTNH_F_LINKDOWN; 2060 if (dead == rt->rt_nhn) 2061 rtm->rtm_flags |= RTNH_F_DEAD; 2062 2063 nla_nest_end(skb, mp); 2064 } 2065 2066 nlmsg_end(skb, nlh); 2067 return 0; 2068 2069 nla_put_failure: 2070 nlmsg_cancel(skb, nlh); 2071 return -EMSGSIZE; 2072 } 2073 2074 #if IS_ENABLED(CONFIG_INET) 2075 static int mpls_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh, 2076 struct fib_dump_filter *filter, 2077 struct netlink_callback *cb) 2078 { 2079 return ip_valid_fib_dump_req(net, nlh, filter, cb); 2080 } 2081 #else 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 struct netlink_ext_ack *extack = cb->extack; 2087 struct nlattr *tb[RTA_MAX + 1]; 2088 struct rtmsg *rtm; 2089 int err, i; 2090 2091 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) { 2092 NL_SET_ERR_MSG_MOD(extack, "Invalid header for FIB dump request"); 2093 return -EINVAL; 2094 } 2095 2096 rtm = nlmsg_data(nlh); 2097 if (rtm->rtm_dst_len || rtm->rtm_src_len || rtm->rtm_tos || 2098 rtm->rtm_table || rtm->rtm_scope || rtm->rtm_type || 2099 rtm->rtm_flags) { 2100 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for FIB dump request"); 2101 return -EINVAL; 2102 } 2103 2104 if (rtm->rtm_protocol) { 2105 filter->protocol = rtm->rtm_protocol; 2106 filter->filter_set = 1; 2107 cb->answer_flags = NLM_F_DUMP_FILTERED; 2108 } 2109 2110 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX, 2111 rtm_mpls_policy, extack); 2112 if (err < 0) 2113 return err; 2114 2115 for (i = 0; i <= RTA_MAX; ++i) { 2116 int ifindex; 2117 2118 if (i == RTA_OIF) { 2119 ifindex = nla_get_u32(tb[i]); 2120 filter->dev = __dev_get_by_index(net, ifindex); 2121 if (!filter->dev) 2122 return -ENODEV; 2123 filter->filter_set = 1; 2124 } else if (tb[i]) { 2125 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request"); 2126 return -EINVAL; 2127 } 2128 } 2129 2130 return 0; 2131 } 2132 #endif 2133 2134 static bool mpls_rt_uses_dev(struct mpls_route *rt, 2135 const struct net_device *dev) 2136 { 2137 struct net_device *nh_dev; 2138 2139 if (rt->rt_nhn == 1) { 2140 struct mpls_nh *nh = rt->rt_nh; 2141 2142 nh_dev = rtnl_dereference(nh->nh_dev); 2143 if (dev == nh_dev) 2144 return true; 2145 } else { 2146 for_nexthops(rt) { 2147 nh_dev = rtnl_dereference(nh->nh_dev); 2148 if (nh_dev == dev) 2149 return true; 2150 } endfor_nexthops(rt); 2151 } 2152 2153 return false; 2154 } 2155 2156 static int mpls_dump_routes(struct sk_buff *skb, struct netlink_callback *cb) 2157 { 2158 const struct nlmsghdr *nlh = cb->nlh; 2159 struct net *net = sock_net(skb->sk); 2160 struct mpls_route __rcu **platform_label; 2161 struct fib_dump_filter filter = {}; 2162 unsigned int flags = NLM_F_MULTI; 2163 size_t platform_labels; 2164 unsigned int index; 2165 2166 ASSERT_RTNL(); 2167 2168 if (cb->strict_check) { 2169 int err; 2170 2171 err = mpls_valid_fib_dump_req(net, nlh, &filter, cb); 2172 if (err < 0) 2173 return err; 2174 2175 /* for MPLS, there is only 1 table with fixed type and flags. 2176 * If either are set in the filter then return nothing. 2177 */ 2178 if ((filter.table_id && filter.table_id != RT_TABLE_MAIN) || 2179 (filter.rt_type && filter.rt_type != RTN_UNICAST) || 2180 filter.flags) 2181 return skb->len; 2182 } 2183 2184 index = cb->args[0]; 2185 if (index < MPLS_LABEL_FIRST_UNRESERVED) 2186 index = MPLS_LABEL_FIRST_UNRESERVED; 2187 2188 platform_label = rtnl_dereference(net->mpls.platform_label); 2189 platform_labels = net->mpls.platform_labels; 2190 2191 if (filter.filter_set) 2192 flags |= NLM_F_DUMP_FILTERED; 2193 2194 for (; index < platform_labels; index++) { 2195 struct mpls_route *rt; 2196 2197 rt = rtnl_dereference(platform_label[index]); 2198 if (!rt) 2199 continue; 2200 2201 if ((filter.dev && !mpls_rt_uses_dev(rt, filter.dev)) || 2202 (filter.protocol && rt->rt_protocol != filter.protocol)) 2203 continue; 2204 2205 if (mpls_dump_route(skb, NETLINK_CB(cb->skb).portid, 2206 cb->nlh->nlmsg_seq, RTM_NEWROUTE, 2207 index, rt, flags) < 0) 2208 break; 2209 } 2210 cb->args[0] = index; 2211 2212 return skb->len; 2213 } 2214 2215 static inline size_t lfib_nlmsg_size(struct mpls_route *rt) 2216 { 2217 size_t payload = 2218 NLMSG_ALIGN(sizeof(struct rtmsg)) 2219 + nla_total_size(4) /* RTA_DST */ 2220 + nla_total_size(1); /* RTA_TTL_PROPAGATE */ 2221 2222 if (rt->rt_nhn == 1) { 2223 struct mpls_nh *nh = rt->rt_nh; 2224 2225 if (nh->nh_dev) 2226 payload += nla_total_size(4); /* RTA_OIF */ 2227 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC) /* RTA_VIA */ 2228 payload += nla_total_size(2 + nh->nh_via_alen); 2229 if (nh->nh_labels) /* RTA_NEWDST */ 2230 payload += nla_total_size(nh->nh_labels * 4); 2231 } else { 2232 /* each nexthop is packed in an attribute */ 2233 size_t nhsize = 0; 2234 2235 for_nexthops(rt) { 2236 if (!rtnl_dereference(nh->nh_dev)) 2237 continue; 2238 nhsize += nla_total_size(sizeof(struct rtnexthop)); 2239 /* RTA_VIA */ 2240 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC) 2241 nhsize += nla_total_size(2 + nh->nh_via_alen); 2242 if (nh->nh_labels) 2243 nhsize += nla_total_size(nh->nh_labels * 4); 2244 } endfor_nexthops(rt); 2245 /* nested attribute */ 2246 payload += nla_total_size(nhsize); 2247 } 2248 2249 return payload; 2250 } 2251 2252 static void rtmsg_lfib(int event, u32 label, struct mpls_route *rt, 2253 struct nlmsghdr *nlh, struct net *net, u32 portid, 2254 unsigned int nlm_flags) 2255 { 2256 struct sk_buff *skb; 2257 u32 seq = nlh ? nlh->nlmsg_seq : 0; 2258 int err = -ENOBUFS; 2259 2260 skb = nlmsg_new(lfib_nlmsg_size(rt), GFP_KERNEL); 2261 if (skb == NULL) 2262 goto errout; 2263 2264 err = mpls_dump_route(skb, portid, seq, event, label, rt, nlm_flags); 2265 if (err < 0) { 2266 /* -EMSGSIZE implies BUG in lfib_nlmsg_size */ 2267 WARN_ON(err == -EMSGSIZE); 2268 kfree_skb(skb); 2269 goto errout; 2270 } 2271 rtnl_notify(skb, net, portid, RTNLGRP_MPLS_ROUTE, nlh, GFP_KERNEL); 2272 2273 return; 2274 errout: 2275 if (err < 0) 2276 rtnl_set_sk_err(net, RTNLGRP_MPLS_ROUTE, err); 2277 } 2278 2279 static int mpls_valid_getroute_req(struct sk_buff *skb, 2280 const struct nlmsghdr *nlh, 2281 struct nlattr **tb, 2282 struct netlink_ext_ack *extack) 2283 { 2284 struct rtmsg *rtm; 2285 int i, err; 2286 2287 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) { 2288 NL_SET_ERR_MSG_MOD(extack, 2289 "Invalid header for get route request"); 2290 return -EINVAL; 2291 } 2292 2293 if (!netlink_strict_get_check(skb)) 2294 return nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX, 2295 rtm_mpls_policy, extack); 2296 2297 rtm = nlmsg_data(nlh); 2298 if ((rtm->rtm_dst_len && rtm->rtm_dst_len != 20) || 2299 rtm->rtm_src_len || rtm->rtm_tos || rtm->rtm_table || 2300 rtm->rtm_protocol || rtm->rtm_scope || rtm->rtm_type) { 2301 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get route request"); 2302 return -EINVAL; 2303 } 2304 if (rtm->rtm_flags & ~RTM_F_FIB_MATCH) { 2305 NL_SET_ERR_MSG_MOD(extack, 2306 "Invalid flags for get route request"); 2307 return -EINVAL; 2308 } 2309 2310 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX, 2311 rtm_mpls_policy, extack); 2312 if (err) 2313 return err; 2314 2315 if ((tb[RTA_DST] || tb[RTA_NEWDST]) && !rtm->rtm_dst_len) { 2316 NL_SET_ERR_MSG_MOD(extack, "rtm_dst_len must be 20 for MPLS"); 2317 return -EINVAL; 2318 } 2319 2320 for (i = 0; i <= RTA_MAX; i++) { 2321 if (!tb[i]) 2322 continue; 2323 2324 switch (i) { 2325 case RTA_DST: 2326 case RTA_NEWDST: 2327 break; 2328 default: 2329 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get route request"); 2330 return -EINVAL; 2331 } 2332 } 2333 2334 return 0; 2335 } 2336 2337 static int mpls_getroute(struct sk_buff *in_skb, struct nlmsghdr *in_nlh, 2338 struct netlink_ext_ack *extack) 2339 { 2340 struct net *net = sock_net(in_skb->sk); 2341 u32 portid = NETLINK_CB(in_skb).portid; 2342 u32 in_label = LABEL_NOT_SPECIFIED; 2343 struct nlattr *tb[RTA_MAX + 1]; 2344 u32 labels[MAX_NEW_LABELS]; 2345 struct mpls_shim_hdr *hdr; 2346 unsigned int hdr_size = 0; 2347 struct net_device *dev; 2348 struct mpls_route *rt; 2349 struct rtmsg *rtm, *r; 2350 struct nlmsghdr *nlh; 2351 struct sk_buff *skb; 2352 struct mpls_nh *nh; 2353 u8 n_labels; 2354 int err; 2355 2356 err = mpls_valid_getroute_req(in_skb, in_nlh, tb, extack); 2357 if (err < 0) 2358 goto errout; 2359 2360 rtm = nlmsg_data(in_nlh); 2361 2362 if (tb[RTA_DST]) { 2363 u8 label_count; 2364 2365 if (nla_get_labels(tb[RTA_DST], 1, &label_count, 2366 &in_label, extack)) { 2367 err = -EINVAL; 2368 goto errout; 2369 } 2370 2371 if (!mpls_label_ok(net, &in_label, extack)) { 2372 err = -EINVAL; 2373 goto errout; 2374 } 2375 } 2376 2377 rt = mpls_route_input_rcu(net, in_label); 2378 if (!rt) { 2379 err = -ENETUNREACH; 2380 goto errout; 2381 } 2382 2383 if (rtm->rtm_flags & RTM_F_FIB_MATCH) { 2384 skb = nlmsg_new(lfib_nlmsg_size(rt), GFP_KERNEL); 2385 if (!skb) { 2386 err = -ENOBUFS; 2387 goto errout; 2388 } 2389 2390 err = mpls_dump_route(skb, portid, in_nlh->nlmsg_seq, 2391 RTM_NEWROUTE, in_label, rt, 0); 2392 if (err < 0) { 2393 /* -EMSGSIZE implies BUG in lfib_nlmsg_size */ 2394 WARN_ON(err == -EMSGSIZE); 2395 goto errout_free; 2396 } 2397 2398 return rtnl_unicast(skb, net, portid); 2399 } 2400 2401 if (tb[RTA_NEWDST]) { 2402 if (nla_get_labels(tb[RTA_NEWDST], MAX_NEW_LABELS, &n_labels, 2403 labels, extack) != 0) { 2404 err = -EINVAL; 2405 goto errout; 2406 } 2407 2408 hdr_size = n_labels * sizeof(struct mpls_shim_hdr); 2409 } 2410 2411 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); 2412 if (!skb) { 2413 err = -ENOBUFS; 2414 goto errout; 2415 } 2416 2417 skb->protocol = htons(ETH_P_MPLS_UC); 2418 2419 if (hdr_size) { 2420 bool bos; 2421 int i; 2422 2423 if (skb_cow(skb, hdr_size)) { 2424 err = -ENOBUFS; 2425 goto errout_free; 2426 } 2427 2428 skb_reserve(skb, hdr_size); 2429 skb_push(skb, hdr_size); 2430 skb_reset_network_header(skb); 2431 2432 /* Push new labels */ 2433 hdr = mpls_hdr(skb); 2434 bos = true; 2435 for (i = n_labels - 1; i >= 0; i--) { 2436 hdr[i] = mpls_entry_encode(labels[i], 2437 1, 0, bos); 2438 bos = false; 2439 } 2440 } 2441 2442 nh = mpls_select_multipath(rt, skb); 2443 if (!nh) { 2444 err = -ENETUNREACH; 2445 goto errout_free; 2446 } 2447 2448 if (hdr_size) { 2449 skb_pull(skb, hdr_size); 2450 skb_reset_network_header(skb); 2451 } 2452 2453 nlh = nlmsg_put(skb, portid, in_nlh->nlmsg_seq, 2454 RTM_NEWROUTE, sizeof(*r), 0); 2455 if (!nlh) { 2456 err = -EMSGSIZE; 2457 goto errout_free; 2458 } 2459 2460 r = nlmsg_data(nlh); 2461 r->rtm_family = AF_MPLS; 2462 r->rtm_dst_len = 20; 2463 r->rtm_src_len = 0; 2464 r->rtm_table = RT_TABLE_MAIN; 2465 r->rtm_type = RTN_UNICAST; 2466 r->rtm_scope = RT_SCOPE_UNIVERSE; 2467 r->rtm_protocol = rt->rt_protocol; 2468 r->rtm_flags = 0; 2469 2470 if (nla_put_labels(skb, RTA_DST, 1, &in_label)) 2471 goto nla_put_failure; 2472 2473 if (nh->nh_labels && 2474 nla_put_labels(skb, RTA_NEWDST, nh->nh_labels, 2475 nh->nh_label)) 2476 goto nla_put_failure; 2477 2478 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC && 2479 nla_put_via(skb, nh->nh_via_table, mpls_nh_via(rt, nh), 2480 nh->nh_via_alen)) 2481 goto nla_put_failure; 2482 dev = rtnl_dereference(nh->nh_dev); 2483 if (dev && nla_put_u32(skb, RTA_OIF, dev->ifindex)) 2484 goto nla_put_failure; 2485 2486 nlmsg_end(skb, nlh); 2487 2488 err = rtnl_unicast(skb, net, portid); 2489 errout: 2490 return err; 2491 2492 nla_put_failure: 2493 nlmsg_cancel(skb, nlh); 2494 err = -EMSGSIZE; 2495 errout_free: 2496 kfree_skb(skb); 2497 return err; 2498 } 2499 2500 static int resize_platform_label_table(struct net *net, size_t limit) 2501 { 2502 size_t size = sizeof(struct mpls_route *) * limit; 2503 size_t old_limit; 2504 size_t cp_size; 2505 struct mpls_route __rcu **labels = NULL, **old; 2506 struct mpls_route *rt0 = NULL, *rt2 = NULL; 2507 unsigned index; 2508 2509 if (size) { 2510 labels = kvzalloc(size, GFP_KERNEL); 2511 if (!labels) 2512 goto nolabels; 2513 } 2514 2515 /* In case the predefined labels need to be populated */ 2516 if (limit > MPLS_LABEL_IPV4NULL) { 2517 struct net_device *lo = net->loopback_dev; 2518 rt0 = mpls_rt_alloc(1, lo->addr_len, 0); 2519 if (IS_ERR(rt0)) 2520 goto nort0; 2521 RCU_INIT_POINTER(rt0->rt_nh->nh_dev, lo); 2522 rt0->rt_protocol = RTPROT_KERNEL; 2523 rt0->rt_payload_type = MPT_IPV4; 2524 rt0->rt_ttl_propagate = MPLS_TTL_PROP_DEFAULT; 2525 rt0->rt_nh->nh_via_table = NEIGH_LINK_TABLE; 2526 rt0->rt_nh->nh_via_alen = lo->addr_len; 2527 memcpy(__mpls_nh_via(rt0, rt0->rt_nh), lo->dev_addr, 2528 lo->addr_len); 2529 } 2530 if (limit > MPLS_LABEL_IPV6NULL) { 2531 struct net_device *lo = net->loopback_dev; 2532 rt2 = mpls_rt_alloc(1, lo->addr_len, 0); 2533 if (IS_ERR(rt2)) 2534 goto nort2; 2535 RCU_INIT_POINTER(rt2->rt_nh->nh_dev, lo); 2536 rt2->rt_protocol = RTPROT_KERNEL; 2537 rt2->rt_payload_type = MPT_IPV6; 2538 rt2->rt_ttl_propagate = MPLS_TTL_PROP_DEFAULT; 2539 rt2->rt_nh->nh_via_table = NEIGH_LINK_TABLE; 2540 rt2->rt_nh->nh_via_alen = lo->addr_len; 2541 memcpy(__mpls_nh_via(rt2, rt2->rt_nh), lo->dev_addr, 2542 lo->addr_len); 2543 } 2544 2545 rtnl_lock(); 2546 /* Remember the original table */ 2547 old = rtnl_dereference(net->mpls.platform_label); 2548 old_limit = net->mpls.platform_labels; 2549 2550 /* Free any labels beyond the new table */ 2551 for (index = limit; index < old_limit; index++) 2552 mpls_route_update(net, index, NULL, NULL); 2553 2554 /* Copy over the old labels */ 2555 cp_size = size; 2556 if (old_limit < limit) 2557 cp_size = old_limit * sizeof(struct mpls_route *); 2558 2559 memcpy(labels, old, cp_size); 2560 2561 /* If needed set the predefined labels */ 2562 if ((old_limit <= MPLS_LABEL_IPV6NULL) && 2563 (limit > MPLS_LABEL_IPV6NULL)) { 2564 RCU_INIT_POINTER(labels[MPLS_LABEL_IPV6NULL], rt2); 2565 rt2 = NULL; 2566 } 2567 2568 if ((old_limit <= MPLS_LABEL_IPV4NULL) && 2569 (limit > MPLS_LABEL_IPV4NULL)) { 2570 RCU_INIT_POINTER(labels[MPLS_LABEL_IPV4NULL], rt0); 2571 rt0 = NULL; 2572 } 2573 2574 /* Update the global pointers */ 2575 net->mpls.platform_labels = limit; 2576 rcu_assign_pointer(net->mpls.platform_label, labels); 2577 2578 rtnl_unlock(); 2579 2580 mpls_rt_free(rt2); 2581 mpls_rt_free(rt0); 2582 2583 if (old) { 2584 synchronize_rcu(); 2585 kvfree(old); 2586 } 2587 return 0; 2588 2589 nort2: 2590 mpls_rt_free(rt0); 2591 nort0: 2592 kvfree(labels); 2593 nolabels: 2594 return -ENOMEM; 2595 } 2596 2597 static int mpls_platform_labels(struct ctl_table *table, int write, 2598 void __user *buffer, size_t *lenp, loff_t *ppos) 2599 { 2600 struct net *net = table->data; 2601 int platform_labels = net->mpls.platform_labels; 2602 int ret; 2603 struct ctl_table tmp = { 2604 .procname = table->procname, 2605 .data = &platform_labels, 2606 .maxlen = sizeof(int), 2607 .mode = table->mode, 2608 .extra1 = SYSCTL_ZERO, 2609 .extra2 = &label_limit, 2610 }; 2611 2612 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); 2613 2614 if (write && ret == 0) 2615 ret = resize_platform_label_table(net, platform_labels); 2616 2617 return ret; 2618 } 2619 2620 #define MPLS_NS_SYSCTL_OFFSET(field) \ 2621 (&((struct net *)0)->field) 2622 2623 static const struct ctl_table mpls_table[] = { 2624 { 2625 .procname = "platform_labels", 2626 .data = NULL, 2627 .maxlen = sizeof(int), 2628 .mode = 0644, 2629 .proc_handler = mpls_platform_labels, 2630 }, 2631 { 2632 .procname = "ip_ttl_propagate", 2633 .data = MPLS_NS_SYSCTL_OFFSET(mpls.ip_ttl_propagate), 2634 .maxlen = sizeof(int), 2635 .mode = 0644, 2636 .proc_handler = proc_dointvec_minmax, 2637 .extra1 = SYSCTL_ZERO, 2638 .extra2 = SYSCTL_ONE, 2639 }, 2640 { 2641 .procname = "default_ttl", 2642 .data = MPLS_NS_SYSCTL_OFFSET(mpls.default_ttl), 2643 .maxlen = sizeof(int), 2644 .mode = 0644, 2645 .proc_handler = proc_dointvec_minmax, 2646 .extra1 = SYSCTL_ONE, 2647 .extra2 = &ttl_max, 2648 }, 2649 { } 2650 }; 2651 2652 static int mpls_net_init(struct net *net) 2653 { 2654 struct ctl_table *table; 2655 int i; 2656 2657 net->mpls.platform_labels = 0; 2658 net->mpls.platform_label = NULL; 2659 net->mpls.ip_ttl_propagate = 1; 2660 net->mpls.default_ttl = 255; 2661 2662 table = kmemdup(mpls_table, sizeof(mpls_table), GFP_KERNEL); 2663 if (table == NULL) 2664 return -ENOMEM; 2665 2666 /* Table data contains only offsets relative to the base of 2667 * the mdev at this point, so make them absolute. 2668 */ 2669 for (i = 0; i < ARRAY_SIZE(mpls_table) - 1; i++) 2670 table[i].data = (char *)net + (uintptr_t)table[i].data; 2671 2672 net->mpls.ctl = register_net_sysctl(net, "net/mpls", table); 2673 if (net->mpls.ctl == NULL) { 2674 kfree(table); 2675 return -ENOMEM; 2676 } 2677 2678 return 0; 2679 } 2680 2681 static void mpls_net_exit(struct net *net) 2682 { 2683 struct mpls_route __rcu **platform_label; 2684 size_t platform_labels; 2685 struct ctl_table *table; 2686 unsigned int index; 2687 2688 table = net->mpls.ctl->ctl_table_arg; 2689 unregister_net_sysctl_table(net->mpls.ctl); 2690 kfree(table); 2691 2692 /* An rcu grace period has passed since there was a device in 2693 * the network namespace (and thus the last in flight packet) 2694 * left this network namespace. This is because 2695 * unregister_netdevice_many and netdev_run_todo has completed 2696 * for each network device that was in this network namespace. 2697 * 2698 * As such no additional rcu synchronization is necessary when 2699 * freeing the platform_label table. 2700 */ 2701 rtnl_lock(); 2702 platform_label = rtnl_dereference(net->mpls.platform_label); 2703 platform_labels = net->mpls.platform_labels; 2704 for (index = 0; index < platform_labels; index++) { 2705 struct mpls_route *rt = rtnl_dereference(platform_label[index]); 2706 RCU_INIT_POINTER(platform_label[index], NULL); 2707 mpls_notify_route(net, index, rt, NULL, NULL); 2708 mpls_rt_free(rt); 2709 } 2710 rtnl_unlock(); 2711 2712 kvfree(platform_label); 2713 } 2714 2715 static struct pernet_operations mpls_net_ops = { 2716 .init = mpls_net_init, 2717 .exit = mpls_net_exit, 2718 }; 2719 2720 static struct rtnl_af_ops mpls_af_ops __read_mostly = { 2721 .family = AF_MPLS, 2722 .fill_stats_af = mpls_fill_stats_af, 2723 .get_stats_af_size = mpls_get_stats_af_size, 2724 }; 2725 2726 static int __init mpls_init(void) 2727 { 2728 int err; 2729 2730 BUILD_BUG_ON(sizeof(struct mpls_shim_hdr) != 4); 2731 2732 err = register_pernet_subsys(&mpls_net_ops); 2733 if (err) 2734 goto out; 2735 2736 err = register_netdevice_notifier(&mpls_dev_notifier); 2737 if (err) 2738 goto out_unregister_pernet; 2739 2740 dev_add_pack(&mpls_packet_type); 2741 2742 rtnl_af_register(&mpls_af_ops); 2743 2744 rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_NEWROUTE, 2745 mpls_rtm_newroute, NULL, 0); 2746 rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_DELROUTE, 2747 mpls_rtm_delroute, NULL, 0); 2748 rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_GETROUTE, 2749 mpls_getroute, mpls_dump_routes, 0); 2750 rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_GETNETCONF, 2751 mpls_netconf_get_devconf, 2752 mpls_netconf_dump_devconf, 0); 2753 err = ipgre_tunnel_encap_add_mpls_ops(); 2754 if (err) 2755 pr_err("Can't add mpls over gre tunnel ops\n"); 2756 2757 err = 0; 2758 out: 2759 return err; 2760 2761 out_unregister_pernet: 2762 unregister_pernet_subsys(&mpls_net_ops); 2763 goto out; 2764 } 2765 module_init(mpls_init); 2766 2767 static void __exit mpls_exit(void) 2768 { 2769 rtnl_unregister_all(PF_MPLS); 2770 rtnl_af_unregister(&mpls_af_ops); 2771 dev_remove_pack(&mpls_packet_type); 2772 unregister_netdevice_notifier(&mpls_dev_notifier); 2773 unregister_pernet_subsys(&mpls_net_ops); 2774 ipgre_tunnel_encap_del_mpls_ops(); 2775 } 2776 module_exit(mpls_exit); 2777 2778 MODULE_DESCRIPTION("MultiProtocol Label Switching"); 2779 MODULE_LICENSE("GPL v2"); 2780 MODULE_ALIAS_NETPROTO(PF_MPLS); 2781