1 #include <linux/types.h> 2 #include <linux/skbuff.h> 3 #include <linux/socket.h> 4 #include <linux/sysctl.h> 5 #include <linux/net.h> 6 #include <linux/module.h> 7 #include <linux/if_arp.h> 8 #include <linux/ipv6.h> 9 #include <linux/mpls.h> 10 #include <linux/netconf.h> 11 #include <linux/nospec.h> 12 #include <linux/vmalloc.h> 13 #include <linux/percpu.h> 14 #include <net/ip.h> 15 #include <net/dst.h> 16 #include <net/sock.h> 17 #include <net/arp.h> 18 #include <net/ip_fib.h> 19 #include <net/netevent.h> 20 #include <net/ip_tunnels.h> 21 #include <net/netns/generic.h> 22 #if IS_ENABLED(CONFIG_IPV6) 23 #include <net/ipv6.h> 24 #endif 25 #include <net/addrconf.h> 26 #include <net/nexthop.h> 27 #include "internal.h" 28 29 /* max memory we will use for mpls_route */ 30 #define MAX_MPLS_ROUTE_MEM 4096 31 32 /* Maximum number of labels to look ahead at when selecting a path of 33 * a multipath route 34 */ 35 #define MAX_MP_SELECT_LABELS 4 36 37 #define MPLS_NEIGH_TABLE_UNSPEC (NEIGH_LINK_TABLE + 1) 38 39 static int zero = 0; 40 static int one = 1; 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 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 struct mpls_route *rt; 348 struct mpls_nh *nh; 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 /* Read and decode the label */ 382 hdr = mpls_hdr(skb); 383 dec = mpls_entry_decode(hdr); 384 385 rt = mpls_route_input_rcu(net, dec.label); 386 if (!rt) { 387 MPLS_INC_STATS(mdev, rx_noroute); 388 goto drop; 389 } 390 391 nh = mpls_select_multipath(rt, skb); 392 if (!nh) 393 goto err; 394 395 /* Pop the label */ 396 skb_pull(skb, sizeof(*hdr)); 397 skb_reset_network_header(skb); 398 399 skb_orphan(skb); 400 401 if (skb_warn_if_lro(skb)) 402 goto err; 403 404 skb_forward_csum(skb); 405 406 /* Verify ttl is valid */ 407 if (dec.ttl <= 1) 408 goto err; 409 dec.ttl -= 1; 410 411 /* Find the output device */ 412 out_dev = rcu_dereference(nh->nh_dev); 413 if (!mpls_output_possible(out_dev)) 414 goto tx_err; 415 416 /* Verify the destination can hold the packet */ 417 new_header_size = mpls_nh_header_size(nh); 418 mtu = mpls_dev_mtu(out_dev); 419 if (mpls_pkt_too_big(skb, mtu - new_header_size)) 420 goto tx_err; 421 422 hh_len = LL_RESERVED_SPACE(out_dev); 423 if (!out_dev->header_ops) 424 hh_len = 0; 425 426 /* Ensure there is enough space for the headers in the skb */ 427 if (skb_cow(skb, hh_len + new_header_size)) 428 goto tx_err; 429 430 skb->dev = out_dev; 431 skb->protocol = htons(ETH_P_MPLS_UC); 432 433 if (unlikely(!new_header_size && dec.bos)) { 434 /* Penultimate hop popping */ 435 if (!mpls_egress(dev_net(out_dev), rt, skb, dec)) 436 goto err; 437 } else { 438 bool bos; 439 int i; 440 skb_push(skb, new_header_size); 441 skb_reset_network_header(skb); 442 /* Push the new labels */ 443 hdr = mpls_hdr(skb); 444 bos = dec.bos; 445 for (i = nh->nh_labels - 1; i >= 0; i--) { 446 hdr[i] = mpls_entry_encode(nh->nh_label[i], 447 dec.ttl, 0, bos); 448 bos = false; 449 } 450 } 451 452 mpls_stats_inc_outucastpkts(out_dev, skb); 453 454 /* If via wasn't specified then send out using device address */ 455 if (nh->nh_via_table == MPLS_NEIGH_TABLE_UNSPEC) 456 err = neigh_xmit(NEIGH_LINK_TABLE, out_dev, 457 out_dev->dev_addr, skb); 458 else 459 err = neigh_xmit(nh->nh_via_table, out_dev, 460 mpls_nh_via(rt, nh), skb); 461 if (err) 462 net_dbg_ratelimited("%s: packet transmission failed: %d\n", 463 __func__, err); 464 return 0; 465 466 tx_err: 467 out_mdev = out_dev ? mpls_dev_get(out_dev) : NULL; 468 if (out_mdev) 469 MPLS_INC_STATS(out_mdev, tx_errors); 470 goto drop; 471 err: 472 MPLS_INC_STATS(mdev, rx_errors); 473 drop: 474 kfree_skb(skb); 475 return NET_RX_DROP; 476 } 477 478 static struct packet_type mpls_packet_type __read_mostly = { 479 .type = cpu_to_be16(ETH_P_MPLS_UC), 480 .func = mpls_forward, 481 }; 482 483 static const struct nla_policy rtm_mpls_policy[RTA_MAX+1] = { 484 [RTA_DST] = { .type = NLA_U32 }, 485 [RTA_OIF] = { .type = NLA_U32 }, 486 [RTA_TTL_PROPAGATE] = { .type = NLA_U8 }, 487 }; 488 489 struct mpls_route_config { 490 u32 rc_protocol; 491 u32 rc_ifindex; 492 u8 rc_via_table; 493 u8 rc_via_alen; 494 u8 rc_via[MAX_VIA_ALEN]; 495 u32 rc_label; 496 u8 rc_ttl_propagate; 497 u8 rc_output_labels; 498 u32 rc_output_label[MAX_NEW_LABELS]; 499 u32 rc_nlflags; 500 enum mpls_payload_type rc_payload_type; 501 struct nl_info rc_nlinfo; 502 struct rtnexthop *rc_mp; 503 int rc_mp_len; 504 }; 505 506 /* all nexthops within a route have the same size based on max 507 * number of labels and max via length for a hop 508 */ 509 static struct mpls_route *mpls_rt_alloc(u8 num_nh, u8 max_alen, u8 max_labels) 510 { 511 u8 nh_size = MPLS_NH_SIZE(max_labels, max_alen); 512 struct mpls_route *rt; 513 size_t size; 514 515 size = sizeof(*rt) + num_nh * nh_size; 516 if (size > MAX_MPLS_ROUTE_MEM) 517 return ERR_PTR(-EINVAL); 518 519 rt = kzalloc(size, GFP_KERNEL); 520 if (!rt) 521 return ERR_PTR(-ENOMEM); 522 523 rt->rt_nhn = num_nh; 524 rt->rt_nhn_alive = num_nh; 525 rt->rt_nh_size = nh_size; 526 rt->rt_via_offset = MPLS_NH_VIA_OFF(max_labels); 527 528 return rt; 529 } 530 531 static void mpls_rt_free(struct mpls_route *rt) 532 { 533 if (rt) 534 kfree_rcu(rt, rt_rcu); 535 } 536 537 static void mpls_notify_route(struct net *net, unsigned index, 538 struct mpls_route *old, struct mpls_route *new, 539 const struct nl_info *info) 540 { 541 struct nlmsghdr *nlh = info ? info->nlh : NULL; 542 unsigned portid = info ? info->portid : 0; 543 int event = new ? RTM_NEWROUTE : RTM_DELROUTE; 544 struct mpls_route *rt = new ? new : old; 545 unsigned nlm_flags = (old && new) ? NLM_F_REPLACE : 0; 546 /* Ignore reserved labels for now */ 547 if (rt && (index >= MPLS_LABEL_FIRST_UNRESERVED)) 548 rtmsg_lfib(event, index, rt, nlh, net, portid, nlm_flags); 549 } 550 551 static void mpls_route_update(struct net *net, unsigned index, 552 struct mpls_route *new, 553 const struct nl_info *info) 554 { 555 struct mpls_route __rcu **platform_label; 556 struct mpls_route *rt; 557 558 ASSERT_RTNL(); 559 560 platform_label = rtnl_dereference(net->mpls.platform_label); 561 rt = rtnl_dereference(platform_label[index]); 562 rcu_assign_pointer(platform_label[index], new); 563 564 mpls_notify_route(net, index, rt, new, info); 565 566 /* If we removed a route free it now */ 567 mpls_rt_free(rt); 568 } 569 570 static unsigned find_free_label(struct net *net) 571 { 572 struct mpls_route __rcu **platform_label; 573 size_t platform_labels; 574 unsigned index; 575 576 platform_label = rtnl_dereference(net->mpls.platform_label); 577 platform_labels = net->mpls.platform_labels; 578 for (index = MPLS_LABEL_FIRST_UNRESERVED; index < platform_labels; 579 index++) { 580 if (!rtnl_dereference(platform_label[index])) 581 return index; 582 } 583 return LABEL_NOT_SPECIFIED; 584 } 585 586 #if IS_ENABLED(CONFIG_INET) 587 static struct net_device *inet_fib_lookup_dev(struct net *net, 588 const void *addr) 589 { 590 struct net_device *dev; 591 struct rtable *rt; 592 struct in_addr daddr; 593 594 memcpy(&daddr, addr, sizeof(struct in_addr)); 595 rt = ip_route_output(net, daddr.s_addr, 0, 0, 0); 596 if (IS_ERR(rt)) 597 return ERR_CAST(rt); 598 599 dev = rt->dst.dev; 600 dev_hold(dev); 601 602 ip_rt_put(rt); 603 604 return dev; 605 } 606 #else 607 static struct net_device *inet_fib_lookup_dev(struct net *net, 608 const void *addr) 609 { 610 return ERR_PTR(-EAFNOSUPPORT); 611 } 612 #endif 613 614 #if IS_ENABLED(CONFIG_IPV6) 615 static struct net_device *inet6_fib_lookup_dev(struct net *net, 616 const void *addr) 617 { 618 struct net_device *dev; 619 struct dst_entry *dst; 620 struct flowi6 fl6; 621 int err; 622 623 if (!ipv6_stub) 624 return ERR_PTR(-EAFNOSUPPORT); 625 626 memset(&fl6, 0, sizeof(fl6)); 627 memcpy(&fl6.daddr, addr, sizeof(struct in6_addr)); 628 err = ipv6_stub->ipv6_dst_lookup(net, NULL, &dst, &fl6); 629 if (err) 630 return ERR_PTR(err); 631 632 dev = dst->dev; 633 dev_hold(dev); 634 dst_release(dst); 635 636 return dev; 637 } 638 #else 639 static struct net_device *inet6_fib_lookup_dev(struct net *net, 640 const void *addr) 641 { 642 return ERR_PTR(-EAFNOSUPPORT); 643 } 644 #endif 645 646 static struct net_device *find_outdev(struct net *net, 647 struct mpls_route *rt, 648 struct mpls_nh *nh, int oif) 649 { 650 struct net_device *dev = NULL; 651 652 if (!oif) { 653 switch (nh->nh_via_table) { 654 case NEIGH_ARP_TABLE: 655 dev = inet_fib_lookup_dev(net, mpls_nh_via(rt, nh)); 656 break; 657 case NEIGH_ND_TABLE: 658 dev = inet6_fib_lookup_dev(net, mpls_nh_via(rt, nh)); 659 break; 660 case NEIGH_LINK_TABLE: 661 break; 662 } 663 } else { 664 dev = dev_get_by_index(net, oif); 665 } 666 667 if (!dev) 668 return ERR_PTR(-ENODEV); 669 670 if (IS_ERR(dev)) 671 return dev; 672 673 /* The caller is holding rtnl anyways, so release the dev reference */ 674 dev_put(dev); 675 676 return dev; 677 } 678 679 static int mpls_nh_assign_dev(struct net *net, struct mpls_route *rt, 680 struct mpls_nh *nh, int oif) 681 { 682 struct net_device *dev = NULL; 683 int err = -ENODEV; 684 685 dev = find_outdev(net, rt, nh, oif); 686 if (IS_ERR(dev)) { 687 err = PTR_ERR(dev); 688 dev = NULL; 689 goto errout; 690 } 691 692 /* Ensure this is a supported device */ 693 err = -EINVAL; 694 if (!mpls_dev_get(dev)) 695 goto errout; 696 697 if ((nh->nh_via_table == NEIGH_LINK_TABLE) && 698 (dev->addr_len != nh->nh_via_alen)) 699 goto errout; 700 701 RCU_INIT_POINTER(nh->nh_dev, dev); 702 703 if (!(dev->flags & IFF_UP)) { 704 nh->nh_flags |= RTNH_F_DEAD; 705 } else { 706 unsigned int flags; 707 708 flags = dev_get_flags(dev); 709 if (!(flags & (IFF_RUNNING | IFF_LOWER_UP))) 710 nh->nh_flags |= RTNH_F_LINKDOWN; 711 } 712 713 return 0; 714 715 errout: 716 return err; 717 } 718 719 static int nla_get_via(const struct nlattr *nla, u8 *via_alen, u8 *via_table, 720 u8 via_addr[], struct netlink_ext_ack *extack) 721 { 722 struct rtvia *via = nla_data(nla); 723 int err = -EINVAL; 724 int alen; 725 726 if (nla_len(nla) < offsetof(struct rtvia, rtvia_addr)) { 727 NL_SET_ERR_MSG_ATTR(extack, nla, 728 "Invalid attribute length for RTA_VIA"); 729 goto errout; 730 } 731 alen = nla_len(nla) - 732 offsetof(struct rtvia, rtvia_addr); 733 if (alen > MAX_VIA_ALEN) { 734 NL_SET_ERR_MSG_ATTR(extack, nla, 735 "Invalid address length for RTA_VIA"); 736 goto errout; 737 } 738 739 /* Validate the address family */ 740 switch (via->rtvia_family) { 741 case AF_PACKET: 742 *via_table = NEIGH_LINK_TABLE; 743 break; 744 case AF_INET: 745 *via_table = NEIGH_ARP_TABLE; 746 if (alen != 4) 747 goto errout; 748 break; 749 case AF_INET6: 750 *via_table = NEIGH_ND_TABLE; 751 if (alen != 16) 752 goto errout; 753 break; 754 default: 755 /* Unsupported address family */ 756 goto errout; 757 } 758 759 memcpy(via_addr, via->rtvia_addr, alen); 760 *via_alen = alen; 761 err = 0; 762 763 errout: 764 return err; 765 } 766 767 static int mpls_nh_build_from_cfg(struct mpls_route_config *cfg, 768 struct mpls_route *rt) 769 { 770 struct net *net = cfg->rc_nlinfo.nl_net; 771 struct mpls_nh *nh = rt->rt_nh; 772 int err; 773 int i; 774 775 if (!nh) 776 return -ENOMEM; 777 778 nh->nh_labels = cfg->rc_output_labels; 779 for (i = 0; i < nh->nh_labels; i++) 780 nh->nh_label[i] = cfg->rc_output_label[i]; 781 782 nh->nh_via_table = cfg->rc_via_table; 783 memcpy(__mpls_nh_via(rt, nh), cfg->rc_via, cfg->rc_via_alen); 784 nh->nh_via_alen = cfg->rc_via_alen; 785 786 err = mpls_nh_assign_dev(net, rt, nh, cfg->rc_ifindex); 787 if (err) 788 goto errout; 789 790 if (nh->nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)) 791 rt->rt_nhn_alive--; 792 793 return 0; 794 795 errout: 796 return err; 797 } 798 799 static int mpls_nh_build(struct net *net, struct mpls_route *rt, 800 struct mpls_nh *nh, int oif, struct nlattr *via, 801 struct nlattr *newdst, u8 max_labels, 802 struct netlink_ext_ack *extack) 803 { 804 int err = -ENOMEM; 805 806 if (!nh) 807 goto errout; 808 809 if (newdst) { 810 err = nla_get_labels(newdst, max_labels, &nh->nh_labels, 811 nh->nh_label, extack); 812 if (err) 813 goto errout; 814 } 815 816 if (via) { 817 err = nla_get_via(via, &nh->nh_via_alen, &nh->nh_via_table, 818 __mpls_nh_via(rt, nh), extack); 819 if (err) 820 goto errout; 821 } else { 822 nh->nh_via_table = MPLS_NEIGH_TABLE_UNSPEC; 823 } 824 825 err = mpls_nh_assign_dev(net, rt, nh, oif); 826 if (err) 827 goto errout; 828 829 return 0; 830 831 errout: 832 return err; 833 } 834 835 static u8 mpls_count_nexthops(struct rtnexthop *rtnh, int len, 836 u8 cfg_via_alen, u8 *max_via_alen, 837 u8 *max_labels) 838 { 839 int remaining = len; 840 u8 nhs = 0; 841 842 *max_via_alen = 0; 843 *max_labels = 0; 844 845 while (rtnh_ok(rtnh, remaining)) { 846 struct nlattr *nla, *attrs = rtnh_attrs(rtnh); 847 int attrlen; 848 u8 n_labels = 0; 849 850 attrlen = rtnh_attrlen(rtnh); 851 nla = nla_find(attrs, attrlen, RTA_VIA); 852 if (nla && nla_len(nla) >= 853 offsetof(struct rtvia, rtvia_addr)) { 854 int via_alen = nla_len(nla) - 855 offsetof(struct rtvia, rtvia_addr); 856 857 if (via_alen <= MAX_VIA_ALEN) 858 *max_via_alen = max_t(u16, *max_via_alen, 859 via_alen); 860 } 861 862 nla = nla_find(attrs, attrlen, RTA_NEWDST); 863 if (nla && 864 nla_get_labels(nla, MAX_NEW_LABELS, &n_labels, 865 NULL, NULL) != 0) 866 return 0; 867 868 *max_labels = max_t(u8, *max_labels, n_labels); 869 870 /* number of nexthops is tracked by a u8. 871 * Check for overflow. 872 */ 873 if (nhs == 255) 874 return 0; 875 nhs++; 876 877 rtnh = rtnh_next(rtnh, &remaining); 878 } 879 880 /* leftover implies invalid nexthop configuration, discard it */ 881 return remaining > 0 ? 0 : nhs; 882 } 883 884 static int mpls_nh_build_multi(struct mpls_route_config *cfg, 885 struct mpls_route *rt, u8 max_labels, 886 struct netlink_ext_ack *extack) 887 { 888 struct rtnexthop *rtnh = cfg->rc_mp; 889 struct nlattr *nla_via, *nla_newdst; 890 int remaining = cfg->rc_mp_len; 891 int err = 0; 892 u8 nhs = 0; 893 894 change_nexthops(rt) { 895 int attrlen; 896 897 nla_via = NULL; 898 nla_newdst = NULL; 899 900 err = -EINVAL; 901 if (!rtnh_ok(rtnh, remaining)) 902 goto errout; 903 904 /* neither weighted multipath nor any flags 905 * are supported 906 */ 907 if (rtnh->rtnh_hops || rtnh->rtnh_flags) 908 goto errout; 909 910 attrlen = rtnh_attrlen(rtnh); 911 if (attrlen > 0) { 912 struct nlattr *attrs = rtnh_attrs(rtnh); 913 914 nla_via = nla_find(attrs, attrlen, RTA_VIA); 915 nla_newdst = nla_find(attrs, attrlen, RTA_NEWDST); 916 } 917 918 err = mpls_nh_build(cfg->rc_nlinfo.nl_net, rt, nh, 919 rtnh->rtnh_ifindex, nla_via, nla_newdst, 920 max_labels, extack); 921 if (err) 922 goto errout; 923 924 if (nh->nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)) 925 rt->rt_nhn_alive--; 926 927 rtnh = rtnh_next(rtnh, &remaining); 928 nhs++; 929 } endfor_nexthops(rt); 930 931 rt->rt_nhn = nhs; 932 933 return 0; 934 935 errout: 936 return err; 937 } 938 939 static bool mpls_label_ok(struct net *net, unsigned int *index, 940 struct netlink_ext_ack *extack) 941 { 942 bool is_ok = true; 943 944 /* Reserved labels may not be set */ 945 if (*index < MPLS_LABEL_FIRST_UNRESERVED) { 946 NL_SET_ERR_MSG(extack, 947 "Invalid label - must be MPLS_LABEL_FIRST_UNRESERVED or higher"); 948 is_ok = false; 949 } 950 951 /* The full 20 bit range may not be supported. */ 952 if (is_ok && *index >= net->mpls.platform_labels) { 953 NL_SET_ERR_MSG(extack, 954 "Label >= configured maximum in platform_labels"); 955 is_ok = false; 956 } 957 958 *index = array_index_nospec(*index, net->mpls.platform_labels); 959 return is_ok; 960 } 961 962 static int mpls_route_add(struct mpls_route_config *cfg, 963 struct netlink_ext_ack *extack) 964 { 965 struct mpls_route __rcu **platform_label; 966 struct net *net = cfg->rc_nlinfo.nl_net; 967 struct mpls_route *rt, *old; 968 int err = -EINVAL; 969 u8 max_via_alen; 970 unsigned index; 971 u8 max_labels; 972 u8 nhs; 973 974 index = cfg->rc_label; 975 976 /* If a label was not specified during insert pick one */ 977 if ((index == LABEL_NOT_SPECIFIED) && 978 (cfg->rc_nlflags & NLM_F_CREATE)) { 979 index = find_free_label(net); 980 } 981 982 if (!mpls_label_ok(net, &index, extack)) 983 goto errout; 984 985 /* Append makes no sense with mpls */ 986 err = -EOPNOTSUPP; 987 if (cfg->rc_nlflags & NLM_F_APPEND) { 988 NL_SET_ERR_MSG(extack, "MPLS does not support route append"); 989 goto errout; 990 } 991 992 err = -EEXIST; 993 platform_label = rtnl_dereference(net->mpls.platform_label); 994 old = rtnl_dereference(platform_label[index]); 995 if ((cfg->rc_nlflags & NLM_F_EXCL) && old) 996 goto errout; 997 998 err = -EEXIST; 999 if (!(cfg->rc_nlflags & NLM_F_REPLACE) && old) 1000 goto errout; 1001 1002 err = -ENOENT; 1003 if (!(cfg->rc_nlflags & NLM_F_CREATE) && !old) 1004 goto errout; 1005 1006 err = -EINVAL; 1007 if (cfg->rc_mp) { 1008 nhs = mpls_count_nexthops(cfg->rc_mp, cfg->rc_mp_len, 1009 cfg->rc_via_alen, &max_via_alen, 1010 &max_labels); 1011 } else { 1012 max_via_alen = cfg->rc_via_alen; 1013 max_labels = cfg->rc_output_labels; 1014 nhs = 1; 1015 } 1016 1017 if (nhs == 0) { 1018 NL_SET_ERR_MSG(extack, "Route does not contain a nexthop"); 1019 goto errout; 1020 } 1021 1022 err = -ENOMEM; 1023 rt = mpls_rt_alloc(nhs, max_via_alen, max_labels); 1024 if (IS_ERR(rt)) { 1025 err = PTR_ERR(rt); 1026 goto errout; 1027 } 1028 1029 rt->rt_protocol = cfg->rc_protocol; 1030 rt->rt_payload_type = cfg->rc_payload_type; 1031 rt->rt_ttl_propagate = cfg->rc_ttl_propagate; 1032 1033 if (cfg->rc_mp) 1034 err = mpls_nh_build_multi(cfg, rt, max_labels, extack); 1035 else 1036 err = mpls_nh_build_from_cfg(cfg, rt); 1037 if (err) 1038 goto freert; 1039 1040 mpls_route_update(net, index, rt, &cfg->rc_nlinfo); 1041 1042 return 0; 1043 1044 freert: 1045 mpls_rt_free(rt); 1046 errout: 1047 return err; 1048 } 1049 1050 static int mpls_route_del(struct mpls_route_config *cfg, 1051 struct netlink_ext_ack *extack) 1052 { 1053 struct net *net = cfg->rc_nlinfo.nl_net; 1054 unsigned index; 1055 int err = -EINVAL; 1056 1057 index = cfg->rc_label; 1058 1059 if (!mpls_label_ok(net, &index, extack)) 1060 goto errout; 1061 1062 mpls_route_update(net, index, NULL, &cfg->rc_nlinfo); 1063 1064 err = 0; 1065 errout: 1066 return err; 1067 } 1068 1069 static void mpls_get_stats(struct mpls_dev *mdev, 1070 struct mpls_link_stats *stats) 1071 { 1072 struct mpls_pcpu_stats *p; 1073 int i; 1074 1075 memset(stats, 0, sizeof(*stats)); 1076 1077 for_each_possible_cpu(i) { 1078 struct mpls_link_stats local; 1079 unsigned int start; 1080 1081 p = per_cpu_ptr(mdev->stats, i); 1082 do { 1083 start = u64_stats_fetch_begin(&p->syncp); 1084 local = p->stats; 1085 } while (u64_stats_fetch_retry(&p->syncp, start)); 1086 1087 stats->rx_packets += local.rx_packets; 1088 stats->rx_bytes += local.rx_bytes; 1089 stats->tx_packets += local.tx_packets; 1090 stats->tx_bytes += local.tx_bytes; 1091 stats->rx_errors += local.rx_errors; 1092 stats->tx_errors += local.tx_errors; 1093 stats->rx_dropped += local.rx_dropped; 1094 stats->tx_dropped += local.tx_dropped; 1095 stats->rx_noroute += local.rx_noroute; 1096 } 1097 } 1098 1099 static int mpls_fill_stats_af(struct sk_buff *skb, 1100 const struct net_device *dev) 1101 { 1102 struct mpls_link_stats *stats; 1103 struct mpls_dev *mdev; 1104 struct nlattr *nla; 1105 1106 mdev = mpls_dev_get(dev); 1107 if (!mdev) 1108 return -ENODATA; 1109 1110 nla = nla_reserve_64bit(skb, MPLS_STATS_LINK, 1111 sizeof(struct mpls_link_stats), 1112 MPLS_STATS_UNSPEC); 1113 if (!nla) 1114 return -EMSGSIZE; 1115 1116 stats = nla_data(nla); 1117 mpls_get_stats(mdev, stats); 1118 1119 return 0; 1120 } 1121 1122 static size_t mpls_get_stats_af_size(const struct net_device *dev) 1123 { 1124 struct mpls_dev *mdev; 1125 1126 mdev = mpls_dev_get(dev); 1127 if (!mdev) 1128 return 0; 1129 1130 return nla_total_size_64bit(sizeof(struct mpls_link_stats)); 1131 } 1132 1133 static int mpls_netconf_fill_devconf(struct sk_buff *skb, struct mpls_dev *mdev, 1134 u32 portid, u32 seq, int event, 1135 unsigned int flags, int type) 1136 { 1137 struct nlmsghdr *nlh; 1138 struct netconfmsg *ncm; 1139 bool all = false; 1140 1141 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 1142 flags); 1143 if (!nlh) 1144 return -EMSGSIZE; 1145 1146 if (type == NETCONFA_ALL) 1147 all = true; 1148 1149 ncm = nlmsg_data(nlh); 1150 ncm->ncm_family = AF_MPLS; 1151 1152 if (nla_put_s32(skb, NETCONFA_IFINDEX, mdev->dev->ifindex) < 0) 1153 goto nla_put_failure; 1154 1155 if ((all || type == NETCONFA_INPUT) && 1156 nla_put_s32(skb, NETCONFA_INPUT, 1157 mdev->input_enabled) < 0) 1158 goto nla_put_failure; 1159 1160 nlmsg_end(skb, nlh); 1161 return 0; 1162 1163 nla_put_failure: 1164 nlmsg_cancel(skb, nlh); 1165 return -EMSGSIZE; 1166 } 1167 1168 static int mpls_netconf_msgsize_devconf(int type) 1169 { 1170 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 1171 + nla_total_size(4); /* NETCONFA_IFINDEX */ 1172 bool all = false; 1173 1174 if (type == NETCONFA_ALL) 1175 all = true; 1176 1177 if (all || type == NETCONFA_INPUT) 1178 size += nla_total_size(4); 1179 1180 return size; 1181 } 1182 1183 static void mpls_netconf_notify_devconf(struct net *net, int event, 1184 int type, struct mpls_dev *mdev) 1185 { 1186 struct sk_buff *skb; 1187 int err = -ENOBUFS; 1188 1189 skb = nlmsg_new(mpls_netconf_msgsize_devconf(type), GFP_KERNEL); 1190 if (!skb) 1191 goto errout; 1192 1193 err = mpls_netconf_fill_devconf(skb, mdev, 0, 0, event, 0, type); 1194 if (err < 0) { 1195 /* -EMSGSIZE implies BUG in mpls_netconf_msgsize_devconf() */ 1196 WARN_ON(err == -EMSGSIZE); 1197 kfree_skb(skb); 1198 goto errout; 1199 } 1200 1201 rtnl_notify(skb, net, 0, RTNLGRP_MPLS_NETCONF, NULL, GFP_KERNEL); 1202 return; 1203 errout: 1204 if (err < 0) 1205 rtnl_set_sk_err(net, RTNLGRP_MPLS_NETCONF, err); 1206 } 1207 1208 static const struct nla_policy devconf_mpls_policy[NETCONFA_MAX + 1] = { 1209 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 1210 }; 1211 1212 static int mpls_netconf_valid_get_req(struct sk_buff *skb, 1213 const struct nlmsghdr *nlh, 1214 struct nlattr **tb, 1215 struct netlink_ext_ack *extack) 1216 { 1217 int i, err; 1218 1219 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) { 1220 NL_SET_ERR_MSG_MOD(extack, 1221 "Invalid header for netconf get request"); 1222 return -EINVAL; 1223 } 1224 1225 if (!netlink_strict_get_check(skb)) 1226 return nlmsg_parse(nlh, sizeof(struct netconfmsg), tb, 1227 NETCONFA_MAX, devconf_mpls_policy, extack); 1228 1229 err = nlmsg_parse_strict(nlh, sizeof(struct netconfmsg), tb, 1230 NETCONFA_MAX, devconf_mpls_policy, extack); 1231 if (err) 1232 return err; 1233 1234 for (i = 0; i <= NETCONFA_MAX; i++) { 1235 if (!tb[i]) 1236 continue; 1237 1238 switch (i) { 1239 case NETCONFA_IFINDEX: 1240 break; 1241 default: 1242 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request"); 1243 return -EINVAL; 1244 } 1245 } 1246 1247 return 0; 1248 } 1249 1250 static int mpls_netconf_get_devconf(struct sk_buff *in_skb, 1251 struct nlmsghdr *nlh, 1252 struct netlink_ext_ack *extack) 1253 { 1254 struct net *net = sock_net(in_skb->sk); 1255 struct nlattr *tb[NETCONFA_MAX + 1]; 1256 struct net_device *dev; 1257 struct mpls_dev *mdev; 1258 struct sk_buff *skb; 1259 int ifindex; 1260 int err; 1261 1262 err = mpls_netconf_valid_get_req(in_skb, nlh, tb, extack); 1263 if (err < 0) 1264 goto errout; 1265 1266 err = -EINVAL; 1267 if (!tb[NETCONFA_IFINDEX]) 1268 goto errout; 1269 1270 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 1271 dev = __dev_get_by_index(net, ifindex); 1272 if (!dev) 1273 goto errout; 1274 1275 mdev = mpls_dev_get(dev); 1276 if (!mdev) 1277 goto errout; 1278 1279 err = -ENOBUFS; 1280 skb = nlmsg_new(mpls_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL); 1281 if (!skb) 1282 goto errout; 1283 1284 err = mpls_netconf_fill_devconf(skb, mdev, 1285 NETLINK_CB(in_skb).portid, 1286 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 1287 NETCONFA_ALL); 1288 if (err < 0) { 1289 /* -EMSGSIZE implies BUG in mpls_netconf_msgsize_devconf() */ 1290 WARN_ON(err == -EMSGSIZE); 1291 kfree_skb(skb); 1292 goto errout; 1293 } 1294 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 1295 errout: 1296 return err; 1297 } 1298 1299 static int mpls_netconf_dump_devconf(struct sk_buff *skb, 1300 struct netlink_callback *cb) 1301 { 1302 const struct nlmsghdr *nlh = cb->nlh; 1303 struct net *net = sock_net(skb->sk); 1304 struct hlist_head *head; 1305 struct net_device *dev; 1306 struct mpls_dev *mdev; 1307 int idx, s_idx; 1308 int h, s_h; 1309 1310 if (cb->strict_check) { 1311 struct netlink_ext_ack *extack = cb->extack; 1312 struct netconfmsg *ncm; 1313 1314 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) { 1315 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request"); 1316 return -EINVAL; 1317 } 1318 1319 if (nlmsg_attrlen(nlh, sizeof(*ncm))) { 1320 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request"); 1321 return -EINVAL; 1322 } 1323 } 1324 1325 s_h = cb->args[0]; 1326 s_idx = idx = cb->args[1]; 1327 1328 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 1329 idx = 0; 1330 head = &net->dev_index_head[h]; 1331 rcu_read_lock(); 1332 cb->seq = net->dev_base_seq; 1333 hlist_for_each_entry_rcu(dev, head, index_hlist) { 1334 if (idx < s_idx) 1335 goto cont; 1336 mdev = mpls_dev_get(dev); 1337 if (!mdev) 1338 goto cont; 1339 if (mpls_netconf_fill_devconf(skb, mdev, 1340 NETLINK_CB(cb->skb).portid, 1341 nlh->nlmsg_seq, 1342 RTM_NEWNETCONF, 1343 NLM_F_MULTI, 1344 NETCONFA_ALL) < 0) { 1345 rcu_read_unlock(); 1346 goto done; 1347 } 1348 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 1349 cont: 1350 idx++; 1351 } 1352 rcu_read_unlock(); 1353 } 1354 done: 1355 cb->args[0] = h; 1356 cb->args[1] = idx; 1357 1358 return skb->len; 1359 } 1360 1361 #define MPLS_PERDEV_SYSCTL_OFFSET(field) \ 1362 (&((struct mpls_dev *)0)->field) 1363 1364 static int mpls_conf_proc(struct ctl_table *ctl, int write, 1365 void __user *buffer, 1366 size_t *lenp, loff_t *ppos) 1367 { 1368 int oval = *(int *)ctl->data; 1369 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 1370 1371 if (write) { 1372 struct mpls_dev *mdev = ctl->extra1; 1373 int i = (int *)ctl->data - (int *)mdev; 1374 struct net *net = ctl->extra2; 1375 int val = *(int *)ctl->data; 1376 1377 if (i == offsetof(struct mpls_dev, input_enabled) && 1378 val != oval) { 1379 mpls_netconf_notify_devconf(net, RTM_NEWNETCONF, 1380 NETCONFA_INPUT, mdev); 1381 } 1382 } 1383 1384 return ret; 1385 } 1386 1387 static const struct ctl_table mpls_dev_table[] = { 1388 { 1389 .procname = "input", 1390 .maxlen = sizeof(int), 1391 .mode = 0644, 1392 .proc_handler = mpls_conf_proc, 1393 .data = MPLS_PERDEV_SYSCTL_OFFSET(input_enabled), 1394 }, 1395 { } 1396 }; 1397 1398 static int mpls_dev_sysctl_register(struct net_device *dev, 1399 struct mpls_dev *mdev) 1400 { 1401 char path[sizeof("net/mpls/conf/") + IFNAMSIZ]; 1402 struct net *net = dev_net(dev); 1403 struct ctl_table *table; 1404 int i; 1405 1406 table = kmemdup(&mpls_dev_table, sizeof(mpls_dev_table), GFP_KERNEL); 1407 if (!table) 1408 goto out; 1409 1410 /* Table data contains only offsets relative to the base of 1411 * the mdev at this point, so make them absolute. 1412 */ 1413 for (i = 0; i < ARRAY_SIZE(mpls_dev_table); i++) { 1414 table[i].data = (char *)mdev + (uintptr_t)table[i].data; 1415 table[i].extra1 = mdev; 1416 table[i].extra2 = net; 1417 } 1418 1419 snprintf(path, sizeof(path), "net/mpls/conf/%s", dev->name); 1420 1421 mdev->sysctl = register_net_sysctl(net, path, table); 1422 if (!mdev->sysctl) 1423 goto free; 1424 1425 mpls_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, mdev); 1426 return 0; 1427 1428 free: 1429 kfree(table); 1430 out: 1431 return -ENOBUFS; 1432 } 1433 1434 static void mpls_dev_sysctl_unregister(struct net_device *dev, 1435 struct mpls_dev *mdev) 1436 { 1437 struct net *net = dev_net(dev); 1438 struct ctl_table *table; 1439 1440 table = mdev->sysctl->ctl_table_arg; 1441 unregister_net_sysctl_table(mdev->sysctl); 1442 kfree(table); 1443 1444 mpls_netconf_notify_devconf(net, RTM_DELNETCONF, 0, mdev); 1445 } 1446 1447 static struct mpls_dev *mpls_add_dev(struct net_device *dev) 1448 { 1449 struct mpls_dev *mdev; 1450 int err = -ENOMEM; 1451 int i; 1452 1453 ASSERT_RTNL(); 1454 1455 mdev = kzalloc(sizeof(*mdev), GFP_KERNEL); 1456 if (!mdev) 1457 return ERR_PTR(err); 1458 1459 mdev->stats = alloc_percpu(struct mpls_pcpu_stats); 1460 if (!mdev->stats) 1461 goto free; 1462 1463 for_each_possible_cpu(i) { 1464 struct mpls_pcpu_stats *mpls_stats; 1465 1466 mpls_stats = per_cpu_ptr(mdev->stats, i); 1467 u64_stats_init(&mpls_stats->syncp); 1468 } 1469 1470 mdev->dev = dev; 1471 1472 err = mpls_dev_sysctl_register(dev, mdev); 1473 if (err) 1474 goto free; 1475 1476 rcu_assign_pointer(dev->mpls_ptr, mdev); 1477 1478 return mdev; 1479 1480 free: 1481 free_percpu(mdev->stats); 1482 kfree(mdev); 1483 return ERR_PTR(err); 1484 } 1485 1486 static void mpls_dev_destroy_rcu(struct rcu_head *head) 1487 { 1488 struct mpls_dev *mdev = container_of(head, struct mpls_dev, rcu); 1489 1490 free_percpu(mdev->stats); 1491 kfree(mdev); 1492 } 1493 1494 static void mpls_ifdown(struct net_device *dev, int event) 1495 { 1496 struct mpls_route __rcu **platform_label; 1497 struct net *net = dev_net(dev); 1498 u8 alive, deleted; 1499 unsigned index; 1500 1501 platform_label = rtnl_dereference(net->mpls.platform_label); 1502 for (index = 0; index < net->mpls.platform_labels; index++) { 1503 struct mpls_route *rt = rtnl_dereference(platform_label[index]); 1504 1505 if (!rt) 1506 continue; 1507 1508 alive = 0; 1509 deleted = 0; 1510 change_nexthops(rt) { 1511 unsigned int nh_flags = nh->nh_flags; 1512 1513 if (rtnl_dereference(nh->nh_dev) != dev) 1514 goto next; 1515 1516 switch (event) { 1517 case NETDEV_DOWN: 1518 case NETDEV_UNREGISTER: 1519 nh_flags |= RTNH_F_DEAD; 1520 /* fall through */ 1521 case NETDEV_CHANGE: 1522 nh_flags |= RTNH_F_LINKDOWN; 1523 break; 1524 } 1525 if (event == NETDEV_UNREGISTER) 1526 RCU_INIT_POINTER(nh->nh_dev, NULL); 1527 1528 if (nh->nh_flags != nh_flags) 1529 WRITE_ONCE(nh->nh_flags, nh_flags); 1530 next: 1531 if (!(nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN))) 1532 alive++; 1533 if (!rtnl_dereference(nh->nh_dev)) 1534 deleted++; 1535 } endfor_nexthops(rt); 1536 1537 WRITE_ONCE(rt->rt_nhn_alive, alive); 1538 1539 /* if there are no more nexthops, delete the route */ 1540 if (event == NETDEV_UNREGISTER && deleted == rt->rt_nhn) 1541 mpls_route_update(net, index, NULL, NULL); 1542 } 1543 } 1544 1545 static void mpls_ifup(struct net_device *dev, unsigned int flags) 1546 { 1547 struct mpls_route __rcu **platform_label; 1548 struct net *net = dev_net(dev); 1549 unsigned index; 1550 u8 alive; 1551 1552 platform_label = rtnl_dereference(net->mpls.platform_label); 1553 for (index = 0; index < net->mpls.platform_labels; index++) { 1554 struct mpls_route *rt = rtnl_dereference(platform_label[index]); 1555 1556 if (!rt) 1557 continue; 1558 1559 alive = 0; 1560 change_nexthops(rt) { 1561 unsigned int nh_flags = nh->nh_flags; 1562 struct net_device *nh_dev = 1563 rtnl_dereference(nh->nh_dev); 1564 1565 if (!(nh_flags & flags)) { 1566 alive++; 1567 continue; 1568 } 1569 if (nh_dev != dev) 1570 continue; 1571 alive++; 1572 nh_flags &= ~flags; 1573 WRITE_ONCE(nh->nh_flags, nh_flags); 1574 } endfor_nexthops(rt); 1575 1576 WRITE_ONCE(rt->rt_nhn_alive, alive); 1577 } 1578 } 1579 1580 static int mpls_dev_notify(struct notifier_block *this, unsigned long event, 1581 void *ptr) 1582 { 1583 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1584 struct mpls_dev *mdev; 1585 unsigned int flags; 1586 1587 if (event == NETDEV_REGISTER) { 1588 1589 /* For now just support Ethernet, IPGRE, IP6GRE, SIT and 1590 * IPIP devices 1591 */ 1592 if (dev->type == ARPHRD_ETHER || 1593 dev->type == ARPHRD_LOOPBACK || 1594 dev->type == ARPHRD_IPGRE || 1595 dev->type == ARPHRD_IP6GRE || 1596 dev->type == ARPHRD_SIT || 1597 dev->type == ARPHRD_TUNNEL) { 1598 mdev = mpls_add_dev(dev); 1599 if (IS_ERR(mdev)) 1600 return notifier_from_errno(PTR_ERR(mdev)); 1601 } 1602 return NOTIFY_OK; 1603 } 1604 1605 mdev = mpls_dev_get(dev); 1606 if (!mdev) 1607 return NOTIFY_OK; 1608 1609 switch (event) { 1610 case NETDEV_DOWN: 1611 mpls_ifdown(dev, event); 1612 break; 1613 case NETDEV_UP: 1614 flags = dev_get_flags(dev); 1615 if (flags & (IFF_RUNNING | IFF_LOWER_UP)) 1616 mpls_ifup(dev, RTNH_F_DEAD | RTNH_F_LINKDOWN); 1617 else 1618 mpls_ifup(dev, RTNH_F_DEAD); 1619 break; 1620 case NETDEV_CHANGE: 1621 flags = dev_get_flags(dev); 1622 if (flags & (IFF_RUNNING | IFF_LOWER_UP)) 1623 mpls_ifup(dev, RTNH_F_DEAD | RTNH_F_LINKDOWN); 1624 else 1625 mpls_ifdown(dev, event); 1626 break; 1627 case NETDEV_UNREGISTER: 1628 mpls_ifdown(dev, event); 1629 mdev = mpls_dev_get(dev); 1630 if (mdev) { 1631 mpls_dev_sysctl_unregister(dev, mdev); 1632 RCU_INIT_POINTER(dev->mpls_ptr, NULL); 1633 call_rcu(&mdev->rcu, mpls_dev_destroy_rcu); 1634 } 1635 break; 1636 case NETDEV_CHANGENAME: 1637 mdev = mpls_dev_get(dev); 1638 if (mdev) { 1639 int err; 1640 1641 mpls_dev_sysctl_unregister(dev, mdev); 1642 err = mpls_dev_sysctl_register(dev, mdev); 1643 if (err) 1644 return notifier_from_errno(err); 1645 } 1646 break; 1647 } 1648 return NOTIFY_OK; 1649 } 1650 1651 static struct notifier_block mpls_dev_notifier = { 1652 .notifier_call = mpls_dev_notify, 1653 }; 1654 1655 static int nla_put_via(struct sk_buff *skb, 1656 u8 table, const void *addr, int alen) 1657 { 1658 static const int table_to_family[NEIGH_NR_TABLES + 1] = { 1659 AF_INET, AF_INET6, AF_DECnet, AF_PACKET, 1660 }; 1661 struct nlattr *nla; 1662 struct rtvia *via; 1663 int family = AF_UNSPEC; 1664 1665 nla = nla_reserve(skb, RTA_VIA, alen + 2); 1666 if (!nla) 1667 return -EMSGSIZE; 1668 1669 if (table <= NEIGH_NR_TABLES) 1670 family = table_to_family[table]; 1671 1672 via = nla_data(nla); 1673 via->rtvia_family = family; 1674 memcpy(via->rtvia_addr, addr, alen); 1675 return 0; 1676 } 1677 1678 int nla_put_labels(struct sk_buff *skb, int attrtype, 1679 u8 labels, const u32 label[]) 1680 { 1681 struct nlattr *nla; 1682 struct mpls_shim_hdr *nla_label; 1683 bool bos; 1684 int i; 1685 nla = nla_reserve(skb, attrtype, labels*4); 1686 if (!nla) 1687 return -EMSGSIZE; 1688 1689 nla_label = nla_data(nla); 1690 bos = true; 1691 for (i = labels - 1; i >= 0; i--) { 1692 nla_label[i] = mpls_entry_encode(label[i], 0, 0, bos); 1693 bos = false; 1694 } 1695 1696 return 0; 1697 } 1698 EXPORT_SYMBOL_GPL(nla_put_labels); 1699 1700 int nla_get_labels(const struct nlattr *nla, u8 max_labels, u8 *labels, 1701 u32 label[], struct netlink_ext_ack *extack) 1702 { 1703 unsigned len = nla_len(nla); 1704 struct mpls_shim_hdr *nla_label; 1705 u8 nla_labels; 1706 bool bos; 1707 int i; 1708 1709 /* len needs to be an even multiple of 4 (the label size). Number 1710 * of labels is a u8 so check for overflow. 1711 */ 1712 if (len & 3 || len / 4 > 255) { 1713 NL_SET_ERR_MSG_ATTR(extack, nla, 1714 "Invalid length for labels attribute"); 1715 return -EINVAL; 1716 } 1717 1718 /* Limit the number of new labels allowed */ 1719 nla_labels = len/4; 1720 if (nla_labels > max_labels) { 1721 NL_SET_ERR_MSG(extack, "Too many labels"); 1722 return -EINVAL; 1723 } 1724 1725 /* when label == NULL, caller wants number of labels */ 1726 if (!label) 1727 goto out; 1728 1729 nla_label = nla_data(nla); 1730 bos = true; 1731 for (i = nla_labels - 1; i >= 0; i--, bos = false) { 1732 struct mpls_entry_decoded dec; 1733 dec = mpls_entry_decode(nla_label + i); 1734 1735 /* Ensure the bottom of stack flag is properly set 1736 * and ttl and tc are both clear. 1737 */ 1738 if (dec.ttl) { 1739 NL_SET_ERR_MSG_ATTR(extack, nla, 1740 "TTL in label must be 0"); 1741 return -EINVAL; 1742 } 1743 1744 if (dec.tc) { 1745 NL_SET_ERR_MSG_ATTR(extack, nla, 1746 "Traffic class in label must be 0"); 1747 return -EINVAL; 1748 } 1749 1750 if (dec.bos != bos) { 1751 NL_SET_BAD_ATTR(extack, nla); 1752 if (bos) { 1753 NL_SET_ERR_MSG(extack, 1754 "BOS bit must be set in first label"); 1755 } else { 1756 NL_SET_ERR_MSG(extack, 1757 "BOS bit can only be set in first label"); 1758 } 1759 return -EINVAL; 1760 } 1761 1762 switch (dec.label) { 1763 case MPLS_LABEL_IMPLNULL: 1764 /* RFC3032: This is a label that an LSR may 1765 * assign and distribute, but which never 1766 * actually appears in the encapsulation. 1767 */ 1768 NL_SET_ERR_MSG_ATTR(extack, nla, 1769 "Implicit NULL Label (3) can not be used in encapsulation"); 1770 return -EINVAL; 1771 } 1772 1773 label[i] = dec.label; 1774 } 1775 out: 1776 *labels = nla_labels; 1777 return 0; 1778 } 1779 EXPORT_SYMBOL_GPL(nla_get_labels); 1780 1781 static int rtm_to_route_config(struct sk_buff *skb, 1782 struct nlmsghdr *nlh, 1783 struct mpls_route_config *cfg, 1784 struct netlink_ext_ack *extack) 1785 { 1786 struct rtmsg *rtm; 1787 struct nlattr *tb[RTA_MAX+1]; 1788 int index; 1789 int err; 1790 1791 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_mpls_policy, 1792 extack); 1793 if (err < 0) 1794 goto errout; 1795 1796 err = -EINVAL; 1797 rtm = nlmsg_data(nlh); 1798 1799 if (rtm->rtm_family != AF_MPLS) { 1800 NL_SET_ERR_MSG(extack, "Invalid address family in rtmsg"); 1801 goto errout; 1802 } 1803 if (rtm->rtm_dst_len != 20) { 1804 NL_SET_ERR_MSG(extack, "rtm_dst_len must be 20 for MPLS"); 1805 goto errout; 1806 } 1807 if (rtm->rtm_src_len != 0) { 1808 NL_SET_ERR_MSG(extack, "rtm_src_len must be 0 for MPLS"); 1809 goto errout; 1810 } 1811 if (rtm->rtm_tos != 0) { 1812 NL_SET_ERR_MSG(extack, "rtm_tos must be 0 for MPLS"); 1813 goto errout; 1814 } 1815 if (rtm->rtm_table != RT_TABLE_MAIN) { 1816 NL_SET_ERR_MSG(extack, 1817 "MPLS only supports the main route table"); 1818 goto errout; 1819 } 1820 /* Any value is acceptable for rtm_protocol */ 1821 1822 /* As mpls uses destination specific addresses 1823 * (or source specific address in the case of multicast) 1824 * all addresses have universal scope. 1825 */ 1826 if (rtm->rtm_scope != RT_SCOPE_UNIVERSE) { 1827 NL_SET_ERR_MSG(extack, 1828 "Invalid route scope - MPLS only supports UNIVERSE"); 1829 goto errout; 1830 } 1831 if (rtm->rtm_type != RTN_UNICAST) { 1832 NL_SET_ERR_MSG(extack, 1833 "Invalid route type - MPLS only supports UNICAST"); 1834 goto errout; 1835 } 1836 if (rtm->rtm_flags != 0) { 1837 NL_SET_ERR_MSG(extack, "rtm_flags must be 0 for MPLS"); 1838 goto errout; 1839 } 1840 1841 cfg->rc_label = LABEL_NOT_SPECIFIED; 1842 cfg->rc_protocol = rtm->rtm_protocol; 1843 cfg->rc_via_table = MPLS_NEIGH_TABLE_UNSPEC; 1844 cfg->rc_ttl_propagate = MPLS_TTL_PROP_DEFAULT; 1845 cfg->rc_nlflags = nlh->nlmsg_flags; 1846 cfg->rc_nlinfo.portid = NETLINK_CB(skb).portid; 1847 cfg->rc_nlinfo.nlh = nlh; 1848 cfg->rc_nlinfo.nl_net = sock_net(skb->sk); 1849 1850 for (index = 0; index <= RTA_MAX; index++) { 1851 struct nlattr *nla = tb[index]; 1852 if (!nla) 1853 continue; 1854 1855 switch (index) { 1856 case RTA_OIF: 1857 cfg->rc_ifindex = nla_get_u32(nla); 1858 break; 1859 case RTA_NEWDST: 1860 if (nla_get_labels(nla, MAX_NEW_LABELS, 1861 &cfg->rc_output_labels, 1862 cfg->rc_output_label, extack)) 1863 goto errout; 1864 break; 1865 case RTA_DST: 1866 { 1867 u8 label_count; 1868 if (nla_get_labels(nla, 1, &label_count, 1869 &cfg->rc_label, extack)) 1870 goto errout; 1871 1872 if (!mpls_label_ok(cfg->rc_nlinfo.nl_net, 1873 &cfg->rc_label, extack)) 1874 goto errout; 1875 break; 1876 } 1877 case RTA_GATEWAY: 1878 NL_SET_ERR_MSG(extack, "MPLS does not support RTA_GATEWAY attribute"); 1879 goto errout; 1880 case RTA_VIA: 1881 { 1882 if (nla_get_via(nla, &cfg->rc_via_alen, 1883 &cfg->rc_via_table, cfg->rc_via, 1884 extack)) 1885 goto errout; 1886 break; 1887 } 1888 case RTA_MULTIPATH: 1889 { 1890 cfg->rc_mp = nla_data(nla); 1891 cfg->rc_mp_len = nla_len(nla); 1892 break; 1893 } 1894 case RTA_TTL_PROPAGATE: 1895 { 1896 u8 ttl_propagate = nla_get_u8(nla); 1897 1898 if (ttl_propagate > 1) { 1899 NL_SET_ERR_MSG_ATTR(extack, nla, 1900 "RTA_TTL_PROPAGATE can only be 0 or 1"); 1901 goto errout; 1902 } 1903 cfg->rc_ttl_propagate = ttl_propagate ? 1904 MPLS_TTL_PROP_ENABLED : 1905 MPLS_TTL_PROP_DISABLED; 1906 break; 1907 } 1908 default: 1909 NL_SET_ERR_MSG_ATTR(extack, nla, "Unknown attribute"); 1910 /* Unsupported attribute */ 1911 goto errout; 1912 } 1913 } 1914 1915 err = 0; 1916 errout: 1917 return err; 1918 } 1919 1920 static int mpls_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, 1921 struct netlink_ext_ack *extack) 1922 { 1923 struct mpls_route_config *cfg; 1924 int err; 1925 1926 cfg = kzalloc(sizeof(*cfg), GFP_KERNEL); 1927 if (!cfg) 1928 return -ENOMEM; 1929 1930 err = rtm_to_route_config(skb, nlh, cfg, extack); 1931 if (err < 0) 1932 goto out; 1933 1934 err = mpls_route_del(cfg, extack); 1935 out: 1936 kfree(cfg); 1937 1938 return err; 1939 } 1940 1941 1942 static int mpls_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, 1943 struct netlink_ext_ack *extack) 1944 { 1945 struct mpls_route_config *cfg; 1946 int err; 1947 1948 cfg = kzalloc(sizeof(*cfg), GFP_KERNEL); 1949 if (!cfg) 1950 return -ENOMEM; 1951 1952 err = rtm_to_route_config(skb, nlh, cfg, extack); 1953 if (err < 0) 1954 goto out; 1955 1956 err = mpls_route_add(cfg, extack); 1957 out: 1958 kfree(cfg); 1959 1960 return err; 1961 } 1962 1963 static int mpls_dump_route(struct sk_buff *skb, u32 portid, u32 seq, int event, 1964 u32 label, struct mpls_route *rt, int flags) 1965 { 1966 struct net_device *dev; 1967 struct nlmsghdr *nlh; 1968 struct rtmsg *rtm; 1969 1970 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*rtm), flags); 1971 if (nlh == NULL) 1972 return -EMSGSIZE; 1973 1974 rtm = nlmsg_data(nlh); 1975 rtm->rtm_family = AF_MPLS; 1976 rtm->rtm_dst_len = 20; 1977 rtm->rtm_src_len = 0; 1978 rtm->rtm_tos = 0; 1979 rtm->rtm_table = RT_TABLE_MAIN; 1980 rtm->rtm_protocol = rt->rt_protocol; 1981 rtm->rtm_scope = RT_SCOPE_UNIVERSE; 1982 rtm->rtm_type = RTN_UNICAST; 1983 rtm->rtm_flags = 0; 1984 1985 if (nla_put_labels(skb, RTA_DST, 1, &label)) 1986 goto nla_put_failure; 1987 1988 if (rt->rt_ttl_propagate != MPLS_TTL_PROP_DEFAULT) { 1989 bool ttl_propagate = 1990 rt->rt_ttl_propagate == MPLS_TTL_PROP_ENABLED; 1991 1992 if (nla_put_u8(skb, RTA_TTL_PROPAGATE, 1993 ttl_propagate)) 1994 goto nla_put_failure; 1995 } 1996 if (rt->rt_nhn == 1) { 1997 const struct mpls_nh *nh = rt->rt_nh; 1998 1999 if (nh->nh_labels && 2000 nla_put_labels(skb, RTA_NEWDST, nh->nh_labels, 2001 nh->nh_label)) 2002 goto nla_put_failure; 2003 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC && 2004 nla_put_via(skb, nh->nh_via_table, mpls_nh_via(rt, nh), 2005 nh->nh_via_alen)) 2006 goto nla_put_failure; 2007 dev = rtnl_dereference(nh->nh_dev); 2008 if (dev && nla_put_u32(skb, RTA_OIF, dev->ifindex)) 2009 goto nla_put_failure; 2010 if (nh->nh_flags & RTNH_F_LINKDOWN) 2011 rtm->rtm_flags |= RTNH_F_LINKDOWN; 2012 if (nh->nh_flags & RTNH_F_DEAD) 2013 rtm->rtm_flags |= RTNH_F_DEAD; 2014 } else { 2015 struct rtnexthop *rtnh; 2016 struct nlattr *mp; 2017 u8 linkdown = 0; 2018 u8 dead = 0; 2019 2020 mp = nla_nest_start(skb, RTA_MULTIPATH); 2021 if (!mp) 2022 goto nla_put_failure; 2023 2024 for_nexthops(rt) { 2025 dev = rtnl_dereference(nh->nh_dev); 2026 if (!dev) 2027 continue; 2028 2029 rtnh = nla_reserve_nohdr(skb, sizeof(*rtnh)); 2030 if (!rtnh) 2031 goto nla_put_failure; 2032 2033 rtnh->rtnh_ifindex = dev->ifindex; 2034 if (nh->nh_flags & RTNH_F_LINKDOWN) { 2035 rtnh->rtnh_flags |= RTNH_F_LINKDOWN; 2036 linkdown++; 2037 } 2038 if (nh->nh_flags & RTNH_F_DEAD) { 2039 rtnh->rtnh_flags |= RTNH_F_DEAD; 2040 dead++; 2041 } 2042 2043 if (nh->nh_labels && nla_put_labels(skb, RTA_NEWDST, 2044 nh->nh_labels, 2045 nh->nh_label)) 2046 goto nla_put_failure; 2047 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC && 2048 nla_put_via(skb, nh->nh_via_table, 2049 mpls_nh_via(rt, nh), 2050 nh->nh_via_alen)) 2051 goto nla_put_failure; 2052 2053 /* length of rtnetlink header + attributes */ 2054 rtnh->rtnh_len = nlmsg_get_pos(skb) - (void *)rtnh; 2055 } endfor_nexthops(rt); 2056 2057 if (linkdown == rt->rt_nhn) 2058 rtm->rtm_flags |= RTNH_F_LINKDOWN; 2059 if (dead == rt->rt_nhn) 2060 rtm->rtm_flags |= RTNH_F_DEAD; 2061 2062 nla_nest_end(skb, mp); 2063 } 2064 2065 nlmsg_end(skb, nlh); 2066 return 0; 2067 2068 nla_put_failure: 2069 nlmsg_cancel(skb, nlh); 2070 return -EMSGSIZE; 2071 } 2072 2073 #if IS_ENABLED(CONFIG_INET) 2074 static int mpls_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh, 2075 struct fib_dump_filter *filter, 2076 struct netlink_callback *cb) 2077 { 2078 return ip_valid_fib_dump_req(net, nlh, filter, cb); 2079 } 2080 #else 2081 static int mpls_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh, 2082 struct fib_dump_filter *filter, 2083 struct netlink_callback *cb) 2084 { 2085 struct netlink_ext_ack *extack = cb->extack; 2086 struct nlattr *tb[RTA_MAX + 1]; 2087 struct rtmsg *rtm; 2088 int err, i; 2089 2090 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) { 2091 NL_SET_ERR_MSG_MOD(extack, "Invalid header for FIB dump request"); 2092 return -EINVAL; 2093 } 2094 2095 rtm = nlmsg_data(nlh); 2096 if (rtm->rtm_dst_len || rtm->rtm_src_len || rtm->rtm_tos || 2097 rtm->rtm_table || rtm->rtm_scope || rtm->rtm_type || 2098 rtm->rtm_flags) { 2099 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for FIB dump request"); 2100 return -EINVAL; 2101 } 2102 2103 if (rtm->rtm_protocol) { 2104 filter->protocol = rtm->rtm_protocol; 2105 filter->filter_set = 1; 2106 cb->answer_flags = NLM_F_DUMP_FILTERED; 2107 } 2108 2109 err = nlmsg_parse_strict(nlh, sizeof(*rtm), tb, RTA_MAX, 2110 rtm_mpls_policy, extack); 2111 if (err < 0) 2112 return err; 2113 2114 for (i = 0; i <= RTA_MAX; ++i) { 2115 int ifindex; 2116 2117 if (i == RTA_OIF) { 2118 ifindex = nla_get_u32(tb[i]); 2119 filter->dev = __dev_get_by_index(net, ifindex); 2120 if (!filter->dev) 2121 return -ENODEV; 2122 filter->filter_set = 1; 2123 } else if (tb[i]) { 2124 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request"); 2125 return -EINVAL; 2126 } 2127 } 2128 2129 return 0; 2130 } 2131 #endif 2132 2133 static bool mpls_rt_uses_dev(struct mpls_route *rt, 2134 const struct net_device *dev) 2135 { 2136 struct net_device *nh_dev; 2137 2138 if (rt->rt_nhn == 1) { 2139 struct mpls_nh *nh = rt->rt_nh; 2140 2141 nh_dev = rtnl_dereference(nh->nh_dev); 2142 if (dev == nh_dev) 2143 return true; 2144 } else { 2145 for_nexthops(rt) { 2146 nh_dev = rtnl_dereference(nh->nh_dev); 2147 if (nh_dev == dev) 2148 return true; 2149 } endfor_nexthops(rt); 2150 } 2151 2152 return false; 2153 } 2154 2155 static int mpls_dump_routes(struct sk_buff *skb, struct netlink_callback *cb) 2156 { 2157 const struct nlmsghdr *nlh = cb->nlh; 2158 struct net *net = sock_net(skb->sk); 2159 struct mpls_route __rcu **platform_label; 2160 struct fib_dump_filter filter = {}; 2161 unsigned int flags = NLM_F_MULTI; 2162 size_t platform_labels; 2163 unsigned int index; 2164 2165 ASSERT_RTNL(); 2166 2167 if (cb->strict_check) { 2168 int err; 2169 2170 err = mpls_valid_fib_dump_req(net, nlh, &filter, cb); 2171 if (err < 0) 2172 return err; 2173 2174 /* for MPLS, there is only 1 table with fixed type and flags. 2175 * If either are set in the filter then return nothing. 2176 */ 2177 if ((filter.table_id && filter.table_id != RT_TABLE_MAIN) || 2178 (filter.rt_type && filter.rt_type != RTN_UNICAST) || 2179 filter.flags) 2180 return skb->len; 2181 } 2182 2183 index = cb->args[0]; 2184 if (index < MPLS_LABEL_FIRST_UNRESERVED) 2185 index = MPLS_LABEL_FIRST_UNRESERVED; 2186 2187 platform_label = rtnl_dereference(net->mpls.platform_label); 2188 platform_labels = net->mpls.platform_labels; 2189 2190 if (filter.filter_set) 2191 flags |= NLM_F_DUMP_FILTERED; 2192 2193 for (; index < platform_labels; index++) { 2194 struct mpls_route *rt; 2195 2196 rt = rtnl_dereference(platform_label[index]); 2197 if (!rt) 2198 continue; 2199 2200 if ((filter.dev && !mpls_rt_uses_dev(rt, filter.dev)) || 2201 (filter.protocol && rt->rt_protocol != filter.protocol)) 2202 continue; 2203 2204 if (mpls_dump_route(skb, NETLINK_CB(cb->skb).portid, 2205 cb->nlh->nlmsg_seq, RTM_NEWROUTE, 2206 index, rt, flags) < 0) 2207 break; 2208 } 2209 cb->args[0] = index; 2210 2211 return skb->len; 2212 } 2213 2214 static inline size_t lfib_nlmsg_size(struct mpls_route *rt) 2215 { 2216 size_t payload = 2217 NLMSG_ALIGN(sizeof(struct rtmsg)) 2218 + nla_total_size(4) /* RTA_DST */ 2219 + nla_total_size(1); /* RTA_TTL_PROPAGATE */ 2220 2221 if (rt->rt_nhn == 1) { 2222 struct mpls_nh *nh = rt->rt_nh; 2223 2224 if (nh->nh_dev) 2225 payload += nla_total_size(4); /* RTA_OIF */ 2226 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC) /* RTA_VIA */ 2227 payload += nla_total_size(2 + nh->nh_via_alen); 2228 if (nh->nh_labels) /* RTA_NEWDST */ 2229 payload += nla_total_size(nh->nh_labels * 4); 2230 } else { 2231 /* each nexthop is packed in an attribute */ 2232 size_t nhsize = 0; 2233 2234 for_nexthops(rt) { 2235 if (!rtnl_dereference(nh->nh_dev)) 2236 continue; 2237 nhsize += nla_total_size(sizeof(struct rtnexthop)); 2238 /* RTA_VIA */ 2239 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC) 2240 nhsize += nla_total_size(2 + nh->nh_via_alen); 2241 if (nh->nh_labels) 2242 nhsize += nla_total_size(nh->nh_labels * 4); 2243 } endfor_nexthops(rt); 2244 /* nested attribute */ 2245 payload += nla_total_size(nhsize); 2246 } 2247 2248 return payload; 2249 } 2250 2251 static void rtmsg_lfib(int event, u32 label, struct mpls_route *rt, 2252 struct nlmsghdr *nlh, struct net *net, u32 portid, 2253 unsigned int nlm_flags) 2254 { 2255 struct sk_buff *skb; 2256 u32 seq = nlh ? nlh->nlmsg_seq : 0; 2257 int err = -ENOBUFS; 2258 2259 skb = nlmsg_new(lfib_nlmsg_size(rt), GFP_KERNEL); 2260 if (skb == NULL) 2261 goto errout; 2262 2263 err = mpls_dump_route(skb, portid, seq, event, label, rt, nlm_flags); 2264 if (err < 0) { 2265 /* -EMSGSIZE implies BUG in lfib_nlmsg_size */ 2266 WARN_ON(err == -EMSGSIZE); 2267 kfree_skb(skb); 2268 goto errout; 2269 } 2270 rtnl_notify(skb, net, portid, RTNLGRP_MPLS_ROUTE, nlh, GFP_KERNEL); 2271 2272 return; 2273 errout: 2274 if (err < 0) 2275 rtnl_set_sk_err(net, RTNLGRP_MPLS_ROUTE, err); 2276 } 2277 2278 static int mpls_valid_getroute_req(struct sk_buff *skb, 2279 const struct nlmsghdr *nlh, 2280 struct nlattr **tb, 2281 struct netlink_ext_ack *extack) 2282 { 2283 struct rtmsg *rtm; 2284 int i, err; 2285 2286 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) { 2287 NL_SET_ERR_MSG_MOD(extack, 2288 "Invalid header for get route request"); 2289 return -EINVAL; 2290 } 2291 2292 if (!netlink_strict_get_check(skb)) 2293 return nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, 2294 rtm_mpls_policy, extack); 2295 2296 rtm = nlmsg_data(nlh); 2297 if ((rtm->rtm_dst_len && rtm->rtm_dst_len != 20) || 2298 rtm->rtm_src_len || rtm->rtm_tos || rtm->rtm_table || 2299 rtm->rtm_protocol || rtm->rtm_scope || rtm->rtm_type) { 2300 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get route request"); 2301 return -EINVAL; 2302 } 2303 if (rtm->rtm_flags & ~RTM_F_FIB_MATCH) { 2304 NL_SET_ERR_MSG_MOD(extack, 2305 "Invalid flags for get route request"); 2306 return -EINVAL; 2307 } 2308 2309 err = nlmsg_parse_strict(nlh, sizeof(*rtm), tb, RTA_MAX, 2310 rtm_mpls_policy, extack); 2311 if (err) 2312 return err; 2313 2314 if ((tb[RTA_DST] || tb[RTA_NEWDST]) && !rtm->rtm_dst_len) { 2315 NL_SET_ERR_MSG_MOD(extack, "rtm_dst_len must be 20 for MPLS"); 2316 return -EINVAL; 2317 } 2318 2319 for (i = 0; i <= RTA_MAX; i++) { 2320 if (!tb[i]) 2321 continue; 2322 2323 switch (i) { 2324 case RTA_DST: 2325 case RTA_NEWDST: 2326 break; 2327 default: 2328 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get route request"); 2329 return -EINVAL; 2330 } 2331 } 2332 2333 return 0; 2334 } 2335 2336 static int mpls_getroute(struct sk_buff *in_skb, struct nlmsghdr *in_nlh, 2337 struct netlink_ext_ack *extack) 2338 { 2339 struct net *net = sock_net(in_skb->sk); 2340 u32 portid = NETLINK_CB(in_skb).portid; 2341 u32 in_label = LABEL_NOT_SPECIFIED; 2342 struct nlattr *tb[RTA_MAX + 1]; 2343 u32 labels[MAX_NEW_LABELS]; 2344 struct mpls_shim_hdr *hdr; 2345 unsigned int hdr_size = 0; 2346 struct net_device *dev; 2347 struct mpls_route *rt; 2348 struct rtmsg *rtm, *r; 2349 struct nlmsghdr *nlh; 2350 struct sk_buff *skb; 2351 struct mpls_nh *nh; 2352 u8 n_labels; 2353 int err; 2354 2355 err = mpls_valid_getroute_req(in_skb, in_nlh, tb, extack); 2356 if (err < 0) 2357 goto errout; 2358 2359 rtm = nlmsg_data(in_nlh); 2360 2361 if (tb[RTA_DST]) { 2362 u8 label_count; 2363 2364 if (nla_get_labels(tb[RTA_DST], 1, &label_count, 2365 &in_label, extack)) { 2366 err = -EINVAL; 2367 goto errout; 2368 } 2369 2370 if (!mpls_label_ok(net, &in_label, extack)) { 2371 err = -EINVAL; 2372 goto errout; 2373 } 2374 } 2375 2376 rt = mpls_route_input_rcu(net, in_label); 2377 if (!rt) { 2378 err = -ENETUNREACH; 2379 goto errout; 2380 } 2381 2382 if (rtm->rtm_flags & RTM_F_FIB_MATCH) { 2383 skb = nlmsg_new(lfib_nlmsg_size(rt), GFP_KERNEL); 2384 if (!skb) { 2385 err = -ENOBUFS; 2386 goto errout; 2387 } 2388 2389 err = mpls_dump_route(skb, portid, in_nlh->nlmsg_seq, 2390 RTM_NEWROUTE, in_label, rt, 0); 2391 if (err < 0) { 2392 /* -EMSGSIZE implies BUG in lfib_nlmsg_size */ 2393 WARN_ON(err == -EMSGSIZE); 2394 goto errout_free; 2395 } 2396 2397 return rtnl_unicast(skb, net, portid); 2398 } 2399 2400 if (tb[RTA_NEWDST]) { 2401 if (nla_get_labels(tb[RTA_NEWDST], MAX_NEW_LABELS, &n_labels, 2402 labels, extack) != 0) { 2403 err = -EINVAL; 2404 goto errout; 2405 } 2406 2407 hdr_size = n_labels * sizeof(struct mpls_shim_hdr); 2408 } 2409 2410 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); 2411 if (!skb) { 2412 err = -ENOBUFS; 2413 goto errout; 2414 } 2415 2416 skb->protocol = htons(ETH_P_MPLS_UC); 2417 2418 if (hdr_size) { 2419 bool bos; 2420 int i; 2421 2422 if (skb_cow(skb, hdr_size)) { 2423 err = -ENOBUFS; 2424 goto errout_free; 2425 } 2426 2427 skb_reserve(skb, hdr_size); 2428 skb_push(skb, hdr_size); 2429 skb_reset_network_header(skb); 2430 2431 /* Push new labels */ 2432 hdr = mpls_hdr(skb); 2433 bos = true; 2434 for (i = n_labels - 1; i >= 0; i--) { 2435 hdr[i] = mpls_entry_encode(labels[i], 2436 1, 0, bos); 2437 bos = false; 2438 } 2439 } 2440 2441 nh = mpls_select_multipath(rt, skb); 2442 if (!nh) { 2443 err = -ENETUNREACH; 2444 goto errout_free; 2445 } 2446 2447 if (hdr_size) { 2448 skb_pull(skb, hdr_size); 2449 skb_reset_network_header(skb); 2450 } 2451 2452 nlh = nlmsg_put(skb, portid, in_nlh->nlmsg_seq, 2453 RTM_NEWROUTE, sizeof(*r), 0); 2454 if (!nlh) { 2455 err = -EMSGSIZE; 2456 goto errout_free; 2457 } 2458 2459 r = nlmsg_data(nlh); 2460 r->rtm_family = AF_MPLS; 2461 r->rtm_dst_len = 20; 2462 r->rtm_src_len = 0; 2463 r->rtm_table = RT_TABLE_MAIN; 2464 r->rtm_type = RTN_UNICAST; 2465 r->rtm_scope = RT_SCOPE_UNIVERSE; 2466 r->rtm_protocol = rt->rt_protocol; 2467 r->rtm_flags = 0; 2468 2469 if (nla_put_labels(skb, RTA_DST, 1, &in_label)) 2470 goto nla_put_failure; 2471 2472 if (nh->nh_labels && 2473 nla_put_labels(skb, RTA_NEWDST, nh->nh_labels, 2474 nh->nh_label)) 2475 goto nla_put_failure; 2476 2477 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC && 2478 nla_put_via(skb, nh->nh_via_table, mpls_nh_via(rt, nh), 2479 nh->nh_via_alen)) 2480 goto nla_put_failure; 2481 dev = rtnl_dereference(nh->nh_dev); 2482 if (dev && nla_put_u32(skb, RTA_OIF, dev->ifindex)) 2483 goto nla_put_failure; 2484 2485 nlmsg_end(skb, nlh); 2486 2487 err = rtnl_unicast(skb, net, portid); 2488 errout: 2489 return err; 2490 2491 nla_put_failure: 2492 nlmsg_cancel(skb, nlh); 2493 err = -EMSGSIZE; 2494 errout_free: 2495 kfree_skb(skb); 2496 return err; 2497 } 2498 2499 static int resize_platform_label_table(struct net *net, size_t limit) 2500 { 2501 size_t size = sizeof(struct mpls_route *) * limit; 2502 size_t old_limit; 2503 size_t cp_size; 2504 struct mpls_route __rcu **labels = NULL, **old; 2505 struct mpls_route *rt0 = NULL, *rt2 = NULL; 2506 unsigned index; 2507 2508 if (size) { 2509 labels = kvzalloc(size, GFP_KERNEL); 2510 if (!labels) 2511 goto nolabels; 2512 } 2513 2514 /* In case the predefined labels need to be populated */ 2515 if (limit > MPLS_LABEL_IPV4NULL) { 2516 struct net_device *lo = net->loopback_dev; 2517 rt0 = mpls_rt_alloc(1, lo->addr_len, 0); 2518 if (IS_ERR(rt0)) 2519 goto nort0; 2520 RCU_INIT_POINTER(rt0->rt_nh->nh_dev, lo); 2521 rt0->rt_protocol = RTPROT_KERNEL; 2522 rt0->rt_payload_type = MPT_IPV4; 2523 rt0->rt_ttl_propagate = MPLS_TTL_PROP_DEFAULT; 2524 rt0->rt_nh->nh_via_table = NEIGH_LINK_TABLE; 2525 rt0->rt_nh->nh_via_alen = lo->addr_len; 2526 memcpy(__mpls_nh_via(rt0, rt0->rt_nh), lo->dev_addr, 2527 lo->addr_len); 2528 } 2529 if (limit > MPLS_LABEL_IPV6NULL) { 2530 struct net_device *lo = net->loopback_dev; 2531 rt2 = mpls_rt_alloc(1, lo->addr_len, 0); 2532 if (IS_ERR(rt2)) 2533 goto nort2; 2534 RCU_INIT_POINTER(rt2->rt_nh->nh_dev, lo); 2535 rt2->rt_protocol = RTPROT_KERNEL; 2536 rt2->rt_payload_type = MPT_IPV6; 2537 rt2->rt_ttl_propagate = MPLS_TTL_PROP_DEFAULT; 2538 rt2->rt_nh->nh_via_table = NEIGH_LINK_TABLE; 2539 rt2->rt_nh->nh_via_alen = lo->addr_len; 2540 memcpy(__mpls_nh_via(rt2, rt2->rt_nh), lo->dev_addr, 2541 lo->addr_len); 2542 } 2543 2544 rtnl_lock(); 2545 /* Remember the original table */ 2546 old = rtnl_dereference(net->mpls.platform_label); 2547 old_limit = net->mpls.platform_labels; 2548 2549 /* Free any labels beyond the new table */ 2550 for (index = limit; index < old_limit; index++) 2551 mpls_route_update(net, index, NULL, NULL); 2552 2553 /* Copy over the old labels */ 2554 cp_size = size; 2555 if (old_limit < limit) 2556 cp_size = old_limit * sizeof(struct mpls_route *); 2557 2558 memcpy(labels, old, cp_size); 2559 2560 /* If needed set the predefined labels */ 2561 if ((old_limit <= MPLS_LABEL_IPV6NULL) && 2562 (limit > MPLS_LABEL_IPV6NULL)) { 2563 RCU_INIT_POINTER(labels[MPLS_LABEL_IPV6NULL], rt2); 2564 rt2 = NULL; 2565 } 2566 2567 if ((old_limit <= MPLS_LABEL_IPV4NULL) && 2568 (limit > MPLS_LABEL_IPV4NULL)) { 2569 RCU_INIT_POINTER(labels[MPLS_LABEL_IPV4NULL], rt0); 2570 rt0 = NULL; 2571 } 2572 2573 /* Update the global pointers */ 2574 net->mpls.platform_labels = limit; 2575 rcu_assign_pointer(net->mpls.platform_label, labels); 2576 2577 rtnl_unlock(); 2578 2579 mpls_rt_free(rt2); 2580 mpls_rt_free(rt0); 2581 2582 if (old) { 2583 synchronize_rcu(); 2584 kvfree(old); 2585 } 2586 return 0; 2587 2588 nort2: 2589 mpls_rt_free(rt0); 2590 nort0: 2591 kvfree(labels); 2592 nolabels: 2593 return -ENOMEM; 2594 } 2595 2596 static int mpls_platform_labels(struct ctl_table *table, int write, 2597 void __user *buffer, size_t *lenp, loff_t *ppos) 2598 { 2599 struct net *net = table->data; 2600 int platform_labels = net->mpls.platform_labels; 2601 int ret; 2602 struct ctl_table tmp = { 2603 .procname = table->procname, 2604 .data = &platform_labels, 2605 .maxlen = sizeof(int), 2606 .mode = table->mode, 2607 .extra1 = &zero, 2608 .extra2 = &label_limit, 2609 }; 2610 2611 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); 2612 2613 if (write && ret == 0) 2614 ret = resize_platform_label_table(net, platform_labels); 2615 2616 return ret; 2617 } 2618 2619 #define MPLS_NS_SYSCTL_OFFSET(field) \ 2620 (&((struct net *)0)->field) 2621 2622 static const struct ctl_table mpls_table[] = { 2623 { 2624 .procname = "platform_labels", 2625 .data = NULL, 2626 .maxlen = sizeof(int), 2627 .mode = 0644, 2628 .proc_handler = mpls_platform_labels, 2629 }, 2630 { 2631 .procname = "ip_ttl_propagate", 2632 .data = MPLS_NS_SYSCTL_OFFSET(mpls.ip_ttl_propagate), 2633 .maxlen = sizeof(int), 2634 .mode = 0644, 2635 .proc_handler = proc_dointvec_minmax, 2636 .extra1 = &zero, 2637 .extra2 = &one, 2638 }, 2639 { 2640 .procname = "default_ttl", 2641 .data = MPLS_NS_SYSCTL_OFFSET(mpls.default_ttl), 2642 .maxlen = sizeof(int), 2643 .mode = 0644, 2644 .proc_handler = proc_dointvec_minmax, 2645 .extra1 = &one, 2646 .extra2 = &ttl_max, 2647 }, 2648 { } 2649 }; 2650 2651 static int mpls_net_init(struct net *net) 2652 { 2653 struct ctl_table *table; 2654 int i; 2655 2656 net->mpls.platform_labels = 0; 2657 net->mpls.platform_label = NULL; 2658 net->mpls.ip_ttl_propagate = 1; 2659 net->mpls.default_ttl = 255; 2660 2661 table = kmemdup(mpls_table, sizeof(mpls_table), GFP_KERNEL); 2662 if (table == NULL) 2663 return -ENOMEM; 2664 2665 /* Table data contains only offsets relative to the base of 2666 * the mdev at this point, so make them absolute. 2667 */ 2668 for (i = 0; i < ARRAY_SIZE(mpls_table) - 1; i++) 2669 table[i].data = (char *)net + (uintptr_t)table[i].data; 2670 2671 net->mpls.ctl = register_net_sysctl(net, "net/mpls", table); 2672 if (net->mpls.ctl == NULL) { 2673 kfree(table); 2674 return -ENOMEM; 2675 } 2676 2677 return 0; 2678 } 2679 2680 static void mpls_net_exit(struct net *net) 2681 { 2682 struct mpls_route __rcu **platform_label; 2683 size_t platform_labels; 2684 struct ctl_table *table; 2685 unsigned int index; 2686 2687 table = net->mpls.ctl->ctl_table_arg; 2688 unregister_net_sysctl_table(net->mpls.ctl); 2689 kfree(table); 2690 2691 /* An rcu grace period has passed since there was a device in 2692 * the network namespace (and thus the last in flight packet) 2693 * left this network namespace. This is because 2694 * unregister_netdevice_many and netdev_run_todo has completed 2695 * for each network device that was in this network namespace. 2696 * 2697 * As such no additional rcu synchronization is necessary when 2698 * freeing the platform_label table. 2699 */ 2700 rtnl_lock(); 2701 platform_label = rtnl_dereference(net->mpls.platform_label); 2702 platform_labels = net->mpls.platform_labels; 2703 for (index = 0; index < platform_labels; index++) { 2704 struct mpls_route *rt = rtnl_dereference(platform_label[index]); 2705 RCU_INIT_POINTER(platform_label[index], NULL); 2706 mpls_notify_route(net, index, rt, NULL, NULL); 2707 mpls_rt_free(rt); 2708 } 2709 rtnl_unlock(); 2710 2711 kvfree(platform_label); 2712 } 2713 2714 static struct pernet_operations mpls_net_ops = { 2715 .init = mpls_net_init, 2716 .exit = mpls_net_exit, 2717 }; 2718 2719 static struct rtnl_af_ops mpls_af_ops __read_mostly = { 2720 .family = AF_MPLS, 2721 .fill_stats_af = mpls_fill_stats_af, 2722 .get_stats_af_size = mpls_get_stats_af_size, 2723 }; 2724 2725 static int __init mpls_init(void) 2726 { 2727 int err; 2728 2729 BUILD_BUG_ON(sizeof(struct mpls_shim_hdr) != 4); 2730 2731 err = register_pernet_subsys(&mpls_net_ops); 2732 if (err) 2733 goto out; 2734 2735 err = register_netdevice_notifier(&mpls_dev_notifier); 2736 if (err) 2737 goto out_unregister_pernet; 2738 2739 dev_add_pack(&mpls_packet_type); 2740 2741 rtnl_af_register(&mpls_af_ops); 2742 2743 rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_NEWROUTE, 2744 mpls_rtm_newroute, NULL, 0); 2745 rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_DELROUTE, 2746 mpls_rtm_delroute, NULL, 0); 2747 rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_GETROUTE, 2748 mpls_getroute, mpls_dump_routes, 0); 2749 rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_GETNETCONF, 2750 mpls_netconf_get_devconf, 2751 mpls_netconf_dump_devconf, 0); 2752 err = ipgre_tunnel_encap_add_mpls_ops(); 2753 if (err) 2754 pr_err("Can't add mpls over gre tunnel ops\n"); 2755 2756 err = 0; 2757 out: 2758 return err; 2759 2760 out_unregister_pernet: 2761 unregister_pernet_subsys(&mpls_net_ops); 2762 goto out; 2763 } 2764 module_init(mpls_init); 2765 2766 static void __exit mpls_exit(void) 2767 { 2768 rtnl_unregister_all(PF_MPLS); 2769 rtnl_af_unregister(&mpls_af_ops); 2770 dev_remove_pack(&mpls_packet_type); 2771 unregister_netdevice_notifier(&mpls_dev_notifier); 2772 unregister_pernet_subsys(&mpls_net_ops); 2773 ipgre_tunnel_encap_del_mpls_ops(); 2774 } 2775 module_exit(mpls_exit); 2776 2777 MODULE_DESCRIPTION("MultiProtocol Label Switching"); 2778 MODULE_LICENSE("GPL v2"); 2779 MODULE_ALIAS_NETPROTO(PF_MPLS); 2780