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 zero = 0; 41 static int one = 1; 42 static int label_limit = (1 << 20) - 1; 43 static int ttl_max = 255; 44 45 #if IS_ENABLED(CONFIG_NET_IP_TUNNEL) 46 static size_t ipgre_mpls_encap_hlen(struct ip_tunnel_encap *e) 47 { 48 return sizeof(struct mpls_shim_hdr); 49 } 50 51 static const struct ip_tunnel_encap_ops mpls_iptun_ops = { 52 .encap_hlen = ipgre_mpls_encap_hlen, 53 }; 54 55 static int ipgre_tunnel_encap_add_mpls_ops(void) 56 { 57 return ip_tunnel_encap_add_ops(&mpls_iptun_ops, TUNNEL_ENCAP_MPLS); 58 } 59 60 static void ipgre_tunnel_encap_del_mpls_ops(void) 61 { 62 ip_tunnel_encap_del_ops(&mpls_iptun_ops, TUNNEL_ENCAP_MPLS); 63 } 64 #else 65 static int ipgre_tunnel_encap_add_mpls_ops(void) 66 { 67 return 0; 68 } 69 70 static void ipgre_tunnel_encap_del_mpls_ops(void) 71 { 72 } 73 #endif 74 75 static void rtmsg_lfib(int event, u32 label, struct mpls_route *rt, 76 struct nlmsghdr *nlh, struct net *net, u32 portid, 77 unsigned int nlm_flags); 78 79 static struct mpls_route *mpls_route_input_rcu(struct net *net, unsigned index) 80 { 81 struct mpls_route *rt = NULL; 82 83 if (index < net->mpls.platform_labels) { 84 struct mpls_route __rcu **platform_label = 85 rcu_dereference(net->mpls.platform_label); 86 rt = rcu_dereference(platform_label[index]); 87 } 88 return rt; 89 } 90 91 bool mpls_output_possible(const struct net_device *dev) 92 { 93 return dev && (dev->flags & IFF_UP) && netif_carrier_ok(dev); 94 } 95 EXPORT_SYMBOL_GPL(mpls_output_possible); 96 97 static u8 *__mpls_nh_via(struct mpls_route *rt, struct mpls_nh *nh) 98 { 99 return (u8 *)nh + rt->rt_via_offset; 100 } 101 102 static const u8 *mpls_nh_via(const struct mpls_route *rt, 103 const struct mpls_nh *nh) 104 { 105 return __mpls_nh_via((struct mpls_route *)rt, (struct mpls_nh *)nh); 106 } 107 108 static unsigned int mpls_nh_header_size(const struct mpls_nh *nh) 109 { 110 /* The size of the layer 2.5 labels to be added for this route */ 111 return nh->nh_labels * sizeof(struct mpls_shim_hdr); 112 } 113 114 unsigned int mpls_dev_mtu(const struct net_device *dev) 115 { 116 /* The amount of data the layer 2 frame can hold */ 117 return dev->mtu; 118 } 119 EXPORT_SYMBOL_GPL(mpls_dev_mtu); 120 121 bool mpls_pkt_too_big(const struct sk_buff *skb, unsigned int mtu) 122 { 123 if (skb->len <= mtu) 124 return false; 125 126 if (skb_is_gso(skb) && skb_gso_validate_network_len(skb, mtu)) 127 return false; 128 129 return true; 130 } 131 EXPORT_SYMBOL_GPL(mpls_pkt_too_big); 132 133 void mpls_stats_inc_outucastpkts(struct net_device *dev, 134 const struct sk_buff *skb) 135 { 136 struct mpls_dev *mdev; 137 138 if (skb->protocol == htons(ETH_P_MPLS_UC)) { 139 mdev = mpls_dev_get(dev); 140 if (mdev) 141 MPLS_INC_STATS_LEN(mdev, skb->len, 142 tx_packets, 143 tx_bytes); 144 } else if (skb->protocol == htons(ETH_P_IP)) { 145 IP_UPD_PO_STATS(dev_net(dev), IPSTATS_MIB_OUT, skb->len); 146 #if IS_ENABLED(CONFIG_IPV6) 147 } else if (skb->protocol == htons(ETH_P_IPV6)) { 148 struct inet6_dev *in6dev = __in6_dev_get(dev); 149 150 if (in6dev) 151 IP6_UPD_PO_STATS(dev_net(dev), in6dev, 152 IPSTATS_MIB_OUT, skb->len); 153 #endif 154 } 155 } 156 EXPORT_SYMBOL_GPL(mpls_stats_inc_outucastpkts); 157 158 static u32 mpls_multipath_hash(struct mpls_route *rt, struct sk_buff *skb) 159 { 160 struct mpls_entry_decoded dec; 161 unsigned int mpls_hdr_len = 0; 162 struct mpls_shim_hdr *hdr; 163 bool eli_seen = false; 164 int label_index; 165 u32 hash = 0; 166 167 for (label_index = 0; label_index < MAX_MP_SELECT_LABELS; 168 label_index++) { 169 mpls_hdr_len += sizeof(*hdr); 170 if (!pskb_may_pull(skb, mpls_hdr_len)) 171 break; 172 173 /* Read and decode the current label */ 174 hdr = mpls_hdr(skb) + label_index; 175 dec = mpls_entry_decode(hdr); 176 177 /* RFC6790 - reserved labels MUST NOT be used as keys 178 * for the load-balancing function 179 */ 180 if (likely(dec.label >= MPLS_LABEL_FIRST_UNRESERVED)) { 181 hash = jhash_1word(dec.label, hash); 182 183 /* The entropy label follows the entropy label 184 * indicator, so this means that the entropy 185 * label was just added to the hash - no need to 186 * go any deeper either in the label stack or in the 187 * payload 188 */ 189 if (eli_seen) 190 break; 191 } else if (dec.label == MPLS_LABEL_ENTROPY) { 192 eli_seen = true; 193 } 194 195 if (!dec.bos) 196 continue; 197 198 /* found bottom label; does skb have room for a header? */ 199 if (pskb_may_pull(skb, mpls_hdr_len + sizeof(struct iphdr))) { 200 const struct iphdr *v4hdr; 201 202 v4hdr = (const struct iphdr *)(hdr + 1); 203 if (v4hdr->version == 4) { 204 hash = jhash_3words(ntohl(v4hdr->saddr), 205 ntohl(v4hdr->daddr), 206 v4hdr->protocol, hash); 207 } else if (v4hdr->version == 6 && 208 pskb_may_pull(skb, mpls_hdr_len + 209 sizeof(struct ipv6hdr))) { 210 const struct ipv6hdr *v6hdr; 211 212 v6hdr = (const struct ipv6hdr *)(hdr + 1); 213 hash = __ipv6_addr_jhash(&v6hdr->saddr, hash); 214 hash = __ipv6_addr_jhash(&v6hdr->daddr, hash); 215 hash = jhash_1word(v6hdr->nexthdr, hash); 216 } 217 } 218 219 break; 220 } 221 222 return hash; 223 } 224 225 static struct mpls_nh *mpls_get_nexthop(struct mpls_route *rt, u8 index) 226 { 227 return (struct mpls_nh *)((u8 *)rt->rt_nh + index * rt->rt_nh_size); 228 } 229 230 /* number of alive nexthops (rt->rt_nhn_alive) and the flags for 231 * a next hop (nh->nh_flags) are modified by netdev event handlers. 232 * Since those fields can change at any moment, use READ_ONCE to 233 * access both. 234 */ 235 static struct mpls_nh *mpls_select_multipath(struct mpls_route *rt, 236 struct sk_buff *skb) 237 { 238 u32 hash = 0; 239 int nh_index = 0; 240 int n = 0; 241 u8 alive; 242 243 /* No need to look further into packet if there's only 244 * one path 245 */ 246 if (rt->rt_nhn == 1) 247 return rt->rt_nh; 248 249 alive = READ_ONCE(rt->rt_nhn_alive); 250 if (alive == 0) 251 return NULL; 252 253 hash = mpls_multipath_hash(rt, skb); 254 nh_index = hash % alive; 255 if (alive == rt->rt_nhn) 256 goto out; 257 for_nexthops(rt) { 258 unsigned int nh_flags = READ_ONCE(nh->nh_flags); 259 260 if (nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)) 261 continue; 262 if (n == nh_index) 263 return nh; 264 n++; 265 } endfor_nexthops(rt); 266 267 out: 268 return mpls_get_nexthop(rt, nh_index); 269 } 270 271 static bool mpls_egress(struct net *net, struct mpls_route *rt, 272 struct sk_buff *skb, struct mpls_entry_decoded dec) 273 { 274 enum mpls_payload_type payload_type; 275 bool success = false; 276 277 /* The IPv4 code below accesses through the IPv4 header 278 * checksum, which is 12 bytes into the packet. 279 * The IPv6 code below accesses through the IPv6 hop limit 280 * which is 8 bytes into the packet. 281 * 282 * For all supported cases there should always be at least 12 283 * bytes of packet data present. The IPv4 header is 20 bytes 284 * without options and the IPv6 header is always 40 bytes 285 * long. 286 */ 287 if (!pskb_may_pull(skb, 12)) 288 return false; 289 290 payload_type = rt->rt_payload_type; 291 if (payload_type == MPT_UNSPEC) 292 payload_type = ip_hdr(skb)->version; 293 294 switch (payload_type) { 295 case MPT_IPV4: { 296 struct iphdr *hdr4 = ip_hdr(skb); 297 u8 new_ttl; 298 skb->protocol = htons(ETH_P_IP); 299 300 /* If propagating TTL, take the decremented TTL from 301 * the incoming MPLS header, otherwise decrement the 302 * TTL, but only if not 0 to avoid underflow. 303 */ 304 if (rt->rt_ttl_propagate == MPLS_TTL_PROP_ENABLED || 305 (rt->rt_ttl_propagate == MPLS_TTL_PROP_DEFAULT && 306 net->mpls.ip_ttl_propagate)) 307 new_ttl = dec.ttl; 308 else 309 new_ttl = hdr4->ttl ? hdr4->ttl - 1 : 0; 310 311 csum_replace2(&hdr4->check, 312 htons(hdr4->ttl << 8), 313 htons(new_ttl << 8)); 314 hdr4->ttl = new_ttl; 315 success = true; 316 break; 317 } 318 case MPT_IPV6: { 319 struct ipv6hdr *hdr6 = ipv6_hdr(skb); 320 skb->protocol = htons(ETH_P_IPV6); 321 322 /* If propagating TTL, take the decremented TTL from 323 * the incoming MPLS header, otherwise decrement the 324 * hop limit, but only if not 0 to avoid underflow. 325 */ 326 if (rt->rt_ttl_propagate == MPLS_TTL_PROP_ENABLED || 327 (rt->rt_ttl_propagate == MPLS_TTL_PROP_DEFAULT && 328 net->mpls.ip_ttl_propagate)) 329 hdr6->hop_limit = dec.ttl; 330 else if (hdr6->hop_limit) 331 hdr6->hop_limit = hdr6->hop_limit - 1; 332 success = true; 333 break; 334 } 335 case MPT_UNSPEC: 336 /* Should have decided which protocol it is by now */ 337 break; 338 } 339 340 return success; 341 } 342 343 static int mpls_forward(struct sk_buff *skb, struct net_device *dev, 344 struct packet_type *pt, struct net_device *orig_dev) 345 { 346 struct net *net = dev_net(dev); 347 struct mpls_shim_hdr *hdr; 348 struct mpls_route *rt; 349 struct mpls_nh *nh; 350 struct mpls_entry_decoded dec; 351 struct net_device *out_dev; 352 struct mpls_dev *out_mdev; 353 struct mpls_dev *mdev; 354 unsigned int hh_len; 355 unsigned int new_header_size; 356 unsigned int mtu; 357 int err; 358 359 /* Careful this entire function runs inside of an rcu critical section */ 360 361 mdev = mpls_dev_get(dev); 362 if (!mdev) 363 goto drop; 364 365 MPLS_INC_STATS_LEN(mdev, skb->len, rx_packets, 366 rx_bytes); 367 368 if (!mdev->input_enabled) { 369 MPLS_INC_STATS(mdev, rx_dropped); 370 goto drop; 371 } 372 373 if (skb->pkt_type != PACKET_HOST) 374 goto err; 375 376 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) 377 goto err; 378 379 if (!pskb_may_pull(skb, sizeof(*hdr))) 380 goto err; 381 382 /* Read and decode the label */ 383 hdr = mpls_hdr(skb); 384 dec = mpls_entry_decode(hdr); 385 386 rt = mpls_route_input_rcu(net, dec.label); 387 if (!rt) { 388 MPLS_INC_STATS(mdev, rx_noroute); 389 goto drop; 390 } 391 392 nh = mpls_select_multipath(rt, skb); 393 if (!nh) 394 goto err; 395 396 /* Pop the label */ 397 skb_pull(skb, sizeof(*hdr)); 398 skb_reset_network_header(skb); 399 400 skb_orphan(skb); 401 402 if (skb_warn_if_lro(skb)) 403 goto err; 404 405 skb_forward_csum(skb); 406 407 /* Verify ttl is valid */ 408 if (dec.ttl <= 1) 409 goto err; 410 dec.ttl -= 1; 411 412 /* Find the output device */ 413 out_dev = rcu_dereference(nh->nh_dev); 414 if (!mpls_output_possible(out_dev)) 415 goto tx_err; 416 417 /* Verify the destination can hold the packet */ 418 new_header_size = mpls_nh_header_size(nh); 419 mtu = mpls_dev_mtu(out_dev); 420 if (mpls_pkt_too_big(skb, mtu - new_header_size)) 421 goto tx_err; 422 423 hh_len = LL_RESERVED_SPACE(out_dev); 424 if (!out_dev->header_ops) 425 hh_len = 0; 426 427 /* Ensure there is enough space for the headers in the skb */ 428 if (skb_cow(skb, hh_len + new_header_size)) 429 goto tx_err; 430 431 skb->dev = out_dev; 432 skb->protocol = htons(ETH_P_MPLS_UC); 433 434 if (unlikely(!new_header_size && dec.bos)) { 435 /* Penultimate hop popping */ 436 if (!mpls_egress(dev_net(out_dev), rt, skb, dec)) 437 goto err; 438 } else { 439 bool bos; 440 int i; 441 skb_push(skb, new_header_size); 442 skb_reset_network_header(skb); 443 /* Push the new labels */ 444 hdr = mpls_hdr(skb); 445 bos = dec.bos; 446 for (i = nh->nh_labels - 1; i >= 0; i--) { 447 hdr[i] = mpls_entry_encode(nh->nh_label[i], 448 dec.ttl, 0, bos); 449 bos = false; 450 } 451 } 452 453 mpls_stats_inc_outucastpkts(out_dev, skb); 454 455 /* If via wasn't specified then send out using device address */ 456 if (nh->nh_via_table == MPLS_NEIGH_TABLE_UNSPEC) 457 err = neigh_xmit(NEIGH_LINK_TABLE, out_dev, 458 out_dev->dev_addr, skb); 459 else 460 err = neigh_xmit(nh->nh_via_table, out_dev, 461 mpls_nh_via(rt, nh), skb); 462 if (err) 463 net_dbg_ratelimited("%s: packet transmission failed: %d\n", 464 __func__, err); 465 return 0; 466 467 tx_err: 468 out_mdev = out_dev ? mpls_dev_get(out_dev) : NULL; 469 if (out_mdev) 470 MPLS_INC_STATS(out_mdev, tx_errors); 471 goto drop; 472 err: 473 MPLS_INC_STATS(mdev, rx_errors); 474 drop: 475 kfree_skb(skb); 476 return NET_RX_DROP; 477 } 478 479 static struct packet_type mpls_packet_type __read_mostly = { 480 .type = cpu_to_be16(ETH_P_MPLS_UC), 481 .func = mpls_forward, 482 }; 483 484 static const struct nla_policy rtm_mpls_policy[RTA_MAX+1] = { 485 [RTA_DST] = { .type = NLA_U32 }, 486 [RTA_OIF] = { .type = NLA_U32 }, 487 [RTA_TTL_PROPAGATE] = { .type = NLA_U8 }, 488 }; 489 490 struct mpls_route_config { 491 u32 rc_protocol; 492 u32 rc_ifindex; 493 u8 rc_via_table; 494 u8 rc_via_alen; 495 u8 rc_via[MAX_VIA_ALEN]; 496 u32 rc_label; 497 u8 rc_ttl_propagate; 498 u8 rc_output_labels; 499 u32 rc_output_label[MAX_NEW_LABELS]; 500 u32 rc_nlflags; 501 enum mpls_payload_type rc_payload_type; 502 struct nl_info rc_nlinfo; 503 struct rtnexthop *rc_mp; 504 int rc_mp_len; 505 }; 506 507 /* all nexthops within a route have the same size based on max 508 * number of labels and max via length for a hop 509 */ 510 static struct mpls_route *mpls_rt_alloc(u8 num_nh, u8 max_alen, u8 max_labels) 511 { 512 u8 nh_size = MPLS_NH_SIZE(max_labels, max_alen); 513 struct mpls_route *rt; 514 size_t size; 515 516 size = sizeof(*rt) + num_nh * nh_size; 517 if (size > MAX_MPLS_ROUTE_MEM) 518 return ERR_PTR(-EINVAL); 519 520 rt = kzalloc(size, GFP_KERNEL); 521 if (!rt) 522 return ERR_PTR(-ENOMEM); 523 524 rt->rt_nhn = num_nh; 525 rt->rt_nhn_alive = num_nh; 526 rt->rt_nh_size = nh_size; 527 rt->rt_via_offset = MPLS_NH_VIA_OFF(max_labels); 528 529 return rt; 530 } 531 532 static void mpls_rt_free(struct mpls_route *rt) 533 { 534 if (rt) 535 kfree_rcu(rt, rt_rcu); 536 } 537 538 static void mpls_notify_route(struct net *net, unsigned index, 539 struct mpls_route *old, struct mpls_route *new, 540 const struct nl_info *info) 541 { 542 struct nlmsghdr *nlh = info ? info->nlh : NULL; 543 unsigned portid = info ? info->portid : 0; 544 int event = new ? RTM_NEWROUTE : RTM_DELROUTE; 545 struct mpls_route *rt = new ? new : old; 546 unsigned nlm_flags = (old && new) ? NLM_F_REPLACE : 0; 547 /* Ignore reserved labels for now */ 548 if (rt && (index >= MPLS_LABEL_FIRST_UNRESERVED)) 549 rtmsg_lfib(event, index, rt, nlh, net, portid, nlm_flags); 550 } 551 552 static void mpls_route_update(struct net *net, unsigned index, 553 struct mpls_route *new, 554 const struct nl_info *info) 555 { 556 struct mpls_route __rcu **platform_label; 557 struct mpls_route *rt; 558 559 ASSERT_RTNL(); 560 561 platform_label = rtnl_dereference(net->mpls.platform_label); 562 rt = rtnl_dereference(platform_label[index]); 563 rcu_assign_pointer(platform_label[index], new); 564 565 mpls_notify_route(net, index, rt, new, info); 566 567 /* If we removed a route free it now */ 568 mpls_rt_free(rt); 569 } 570 571 static unsigned find_free_label(struct net *net) 572 { 573 struct mpls_route __rcu **platform_label; 574 size_t platform_labels; 575 unsigned index; 576 577 platform_label = rtnl_dereference(net->mpls.platform_label); 578 platform_labels = net->mpls.platform_labels; 579 for (index = MPLS_LABEL_FIRST_UNRESERVED; index < platform_labels; 580 index++) { 581 if (!rtnl_dereference(platform_label[index])) 582 return index; 583 } 584 return LABEL_NOT_SPECIFIED; 585 } 586 587 #if IS_ENABLED(CONFIG_INET) 588 static struct net_device *inet_fib_lookup_dev(struct net *net, 589 const void *addr) 590 { 591 struct net_device *dev; 592 struct rtable *rt; 593 struct in_addr daddr; 594 595 memcpy(&daddr, addr, sizeof(struct in_addr)); 596 rt = ip_route_output(net, daddr.s_addr, 0, 0, 0); 597 if (IS_ERR(rt)) 598 return ERR_CAST(rt); 599 600 dev = rt->dst.dev; 601 dev_hold(dev); 602 603 ip_rt_put(rt); 604 605 return dev; 606 } 607 #else 608 static struct net_device *inet_fib_lookup_dev(struct net *net, 609 const void *addr) 610 { 611 return ERR_PTR(-EAFNOSUPPORT); 612 } 613 #endif 614 615 #if IS_ENABLED(CONFIG_IPV6) 616 static struct net_device *inet6_fib_lookup_dev(struct net *net, 617 const void *addr) 618 { 619 struct net_device *dev; 620 struct dst_entry *dst; 621 struct flowi6 fl6; 622 int err; 623 624 if (!ipv6_stub) 625 return ERR_PTR(-EAFNOSUPPORT); 626 627 memset(&fl6, 0, sizeof(fl6)); 628 memcpy(&fl6.daddr, addr, sizeof(struct in6_addr)); 629 err = ipv6_stub->ipv6_dst_lookup(net, NULL, &dst, &fl6); 630 if (err) 631 return ERR_PTR(err); 632 633 dev = dst->dev; 634 dev_hold(dev); 635 dst_release(dst); 636 637 return dev; 638 } 639 #else 640 static struct net_device *inet6_fib_lookup_dev(struct net *net, 641 const void *addr) 642 { 643 return ERR_PTR(-EAFNOSUPPORT); 644 } 645 #endif 646 647 static struct net_device *find_outdev(struct net *net, 648 struct mpls_route *rt, 649 struct mpls_nh *nh, int oif) 650 { 651 struct net_device *dev = NULL; 652 653 if (!oif) { 654 switch (nh->nh_via_table) { 655 case NEIGH_ARP_TABLE: 656 dev = inet_fib_lookup_dev(net, mpls_nh_via(rt, nh)); 657 break; 658 case NEIGH_ND_TABLE: 659 dev = inet6_fib_lookup_dev(net, mpls_nh_via(rt, nh)); 660 break; 661 case NEIGH_LINK_TABLE: 662 break; 663 } 664 } else { 665 dev = dev_get_by_index(net, oif); 666 } 667 668 if (!dev) 669 return ERR_PTR(-ENODEV); 670 671 if (IS_ERR(dev)) 672 return dev; 673 674 /* The caller is holding rtnl anyways, so release the dev reference */ 675 dev_put(dev); 676 677 return dev; 678 } 679 680 static int mpls_nh_assign_dev(struct net *net, struct mpls_route *rt, 681 struct mpls_nh *nh, int oif) 682 { 683 struct net_device *dev = NULL; 684 int err = -ENODEV; 685 686 dev = find_outdev(net, rt, nh, oif); 687 if (IS_ERR(dev)) { 688 err = PTR_ERR(dev); 689 dev = NULL; 690 goto errout; 691 } 692 693 /* Ensure this is a supported device */ 694 err = -EINVAL; 695 if (!mpls_dev_get(dev)) 696 goto errout; 697 698 if ((nh->nh_via_table == NEIGH_LINK_TABLE) && 699 (dev->addr_len != nh->nh_via_alen)) 700 goto errout; 701 702 RCU_INIT_POINTER(nh->nh_dev, dev); 703 704 if (!(dev->flags & IFF_UP)) { 705 nh->nh_flags |= RTNH_F_DEAD; 706 } else { 707 unsigned int flags; 708 709 flags = dev_get_flags(dev); 710 if (!(flags & (IFF_RUNNING | IFF_LOWER_UP))) 711 nh->nh_flags |= RTNH_F_LINKDOWN; 712 } 713 714 return 0; 715 716 errout: 717 return err; 718 } 719 720 static int nla_get_via(const struct nlattr *nla, u8 *via_alen, u8 *via_table, 721 u8 via_addr[], struct netlink_ext_ack *extack) 722 { 723 struct rtvia *via = nla_data(nla); 724 int err = -EINVAL; 725 int alen; 726 727 if (nla_len(nla) < offsetof(struct rtvia, rtvia_addr)) { 728 NL_SET_ERR_MSG_ATTR(extack, nla, 729 "Invalid attribute length for RTA_VIA"); 730 goto errout; 731 } 732 alen = nla_len(nla) - 733 offsetof(struct rtvia, rtvia_addr); 734 if (alen > MAX_VIA_ALEN) { 735 NL_SET_ERR_MSG_ATTR(extack, nla, 736 "Invalid address length for RTA_VIA"); 737 goto errout; 738 } 739 740 /* Validate the address family */ 741 switch (via->rtvia_family) { 742 case AF_PACKET: 743 *via_table = NEIGH_LINK_TABLE; 744 break; 745 case AF_INET: 746 *via_table = NEIGH_ARP_TABLE; 747 if (alen != 4) 748 goto errout; 749 break; 750 case AF_INET6: 751 *via_table = NEIGH_ND_TABLE; 752 if (alen != 16) 753 goto errout; 754 break; 755 default: 756 /* Unsupported address family */ 757 goto errout; 758 } 759 760 memcpy(via_addr, via->rtvia_addr, alen); 761 *via_alen = alen; 762 err = 0; 763 764 errout: 765 return err; 766 } 767 768 static int mpls_nh_build_from_cfg(struct mpls_route_config *cfg, 769 struct mpls_route *rt) 770 { 771 struct net *net = cfg->rc_nlinfo.nl_net; 772 struct mpls_nh *nh = rt->rt_nh; 773 int err; 774 int i; 775 776 if (!nh) 777 return -ENOMEM; 778 779 nh->nh_labels = cfg->rc_output_labels; 780 for (i = 0; i < nh->nh_labels; i++) 781 nh->nh_label[i] = cfg->rc_output_label[i]; 782 783 nh->nh_via_table = cfg->rc_via_table; 784 memcpy(__mpls_nh_via(rt, nh), cfg->rc_via, cfg->rc_via_alen); 785 nh->nh_via_alen = cfg->rc_via_alen; 786 787 err = mpls_nh_assign_dev(net, rt, nh, cfg->rc_ifindex); 788 if (err) 789 goto errout; 790 791 if (nh->nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)) 792 rt->rt_nhn_alive--; 793 794 return 0; 795 796 errout: 797 return err; 798 } 799 800 static int mpls_nh_build(struct net *net, struct mpls_route *rt, 801 struct mpls_nh *nh, int oif, struct nlattr *via, 802 struct nlattr *newdst, u8 max_labels, 803 struct netlink_ext_ack *extack) 804 { 805 int err = -ENOMEM; 806 807 if (!nh) 808 goto errout; 809 810 if (newdst) { 811 err = nla_get_labels(newdst, max_labels, &nh->nh_labels, 812 nh->nh_label, extack); 813 if (err) 814 goto errout; 815 } 816 817 if (via) { 818 err = nla_get_via(via, &nh->nh_via_alen, &nh->nh_via_table, 819 __mpls_nh_via(rt, nh), extack); 820 if (err) 821 goto errout; 822 } else { 823 nh->nh_via_table = MPLS_NEIGH_TABLE_UNSPEC; 824 } 825 826 err = mpls_nh_assign_dev(net, rt, nh, oif); 827 if (err) 828 goto errout; 829 830 return 0; 831 832 errout: 833 return err; 834 } 835 836 static u8 mpls_count_nexthops(struct rtnexthop *rtnh, int len, 837 u8 cfg_via_alen, u8 *max_via_alen, 838 u8 *max_labels) 839 { 840 int remaining = len; 841 u8 nhs = 0; 842 843 *max_via_alen = 0; 844 *max_labels = 0; 845 846 while (rtnh_ok(rtnh, remaining)) { 847 struct nlattr *nla, *attrs = rtnh_attrs(rtnh); 848 int attrlen; 849 u8 n_labels = 0; 850 851 attrlen = rtnh_attrlen(rtnh); 852 nla = nla_find(attrs, attrlen, RTA_VIA); 853 if (nla && nla_len(nla) >= 854 offsetof(struct rtvia, rtvia_addr)) { 855 int via_alen = nla_len(nla) - 856 offsetof(struct rtvia, rtvia_addr); 857 858 if (via_alen <= MAX_VIA_ALEN) 859 *max_via_alen = max_t(u16, *max_via_alen, 860 via_alen); 861 } 862 863 nla = nla_find(attrs, attrlen, RTA_NEWDST); 864 if (nla && 865 nla_get_labels(nla, MAX_NEW_LABELS, &n_labels, 866 NULL, NULL) != 0) 867 return 0; 868 869 *max_labels = max_t(u8, *max_labels, n_labels); 870 871 /* number of nexthops is tracked by a u8. 872 * Check for overflow. 873 */ 874 if (nhs == 255) 875 return 0; 876 nhs++; 877 878 rtnh = rtnh_next(rtnh, &remaining); 879 } 880 881 /* leftover implies invalid nexthop configuration, discard it */ 882 return remaining > 0 ? 0 : nhs; 883 } 884 885 static int mpls_nh_build_multi(struct mpls_route_config *cfg, 886 struct mpls_route *rt, u8 max_labels, 887 struct netlink_ext_ack *extack) 888 { 889 struct rtnexthop *rtnh = cfg->rc_mp; 890 struct nlattr *nla_via, *nla_newdst; 891 int remaining = cfg->rc_mp_len; 892 int err = 0; 893 u8 nhs = 0; 894 895 change_nexthops(rt) { 896 int attrlen; 897 898 nla_via = NULL; 899 nla_newdst = NULL; 900 901 err = -EINVAL; 902 if (!rtnh_ok(rtnh, remaining)) 903 goto errout; 904 905 /* neither weighted multipath nor any flags 906 * are supported 907 */ 908 if (rtnh->rtnh_hops || rtnh->rtnh_flags) 909 goto errout; 910 911 attrlen = rtnh_attrlen(rtnh); 912 if (attrlen > 0) { 913 struct nlattr *attrs = rtnh_attrs(rtnh); 914 915 nla_via = nla_find(attrs, attrlen, RTA_VIA); 916 nla_newdst = nla_find(attrs, attrlen, RTA_NEWDST); 917 } 918 919 err = mpls_nh_build(cfg->rc_nlinfo.nl_net, rt, nh, 920 rtnh->rtnh_ifindex, nla_via, nla_newdst, 921 max_labels, extack); 922 if (err) 923 goto errout; 924 925 if (nh->nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)) 926 rt->rt_nhn_alive--; 927 928 rtnh = rtnh_next(rtnh, &remaining); 929 nhs++; 930 } endfor_nexthops(rt); 931 932 rt->rt_nhn = nhs; 933 934 return 0; 935 936 errout: 937 return err; 938 } 939 940 static bool mpls_label_ok(struct net *net, unsigned int *index, 941 struct netlink_ext_ack *extack) 942 { 943 bool is_ok = true; 944 945 /* Reserved labels may not be set */ 946 if (*index < MPLS_LABEL_FIRST_UNRESERVED) { 947 NL_SET_ERR_MSG(extack, 948 "Invalid label - must be MPLS_LABEL_FIRST_UNRESERVED or higher"); 949 is_ok = false; 950 } 951 952 /* The full 20 bit range may not be supported. */ 953 if (is_ok && *index >= net->mpls.platform_labels) { 954 NL_SET_ERR_MSG(extack, 955 "Label >= configured maximum in platform_labels"); 956 is_ok = false; 957 } 958 959 *index = array_index_nospec(*index, net->mpls.platform_labels); 960 return is_ok; 961 } 962 963 static int mpls_route_add(struct mpls_route_config *cfg, 964 struct netlink_ext_ack *extack) 965 { 966 struct mpls_route __rcu **platform_label; 967 struct net *net = cfg->rc_nlinfo.nl_net; 968 struct mpls_route *rt, *old; 969 int err = -EINVAL; 970 u8 max_via_alen; 971 unsigned index; 972 u8 max_labels; 973 u8 nhs; 974 975 index = cfg->rc_label; 976 977 /* If a label was not specified during insert pick one */ 978 if ((index == LABEL_NOT_SPECIFIED) && 979 (cfg->rc_nlflags & NLM_F_CREATE)) { 980 index = find_free_label(net); 981 } 982 983 if (!mpls_label_ok(net, &index, extack)) 984 goto errout; 985 986 /* Append makes no sense with mpls */ 987 err = -EOPNOTSUPP; 988 if (cfg->rc_nlflags & NLM_F_APPEND) { 989 NL_SET_ERR_MSG(extack, "MPLS does not support route append"); 990 goto errout; 991 } 992 993 err = -EEXIST; 994 platform_label = rtnl_dereference(net->mpls.platform_label); 995 old = rtnl_dereference(platform_label[index]); 996 if ((cfg->rc_nlflags & NLM_F_EXCL) && old) 997 goto errout; 998 999 err = -EEXIST; 1000 if (!(cfg->rc_nlflags & NLM_F_REPLACE) && old) 1001 goto errout; 1002 1003 err = -ENOENT; 1004 if (!(cfg->rc_nlflags & NLM_F_CREATE) && !old) 1005 goto errout; 1006 1007 err = -EINVAL; 1008 if (cfg->rc_mp) { 1009 nhs = mpls_count_nexthops(cfg->rc_mp, cfg->rc_mp_len, 1010 cfg->rc_via_alen, &max_via_alen, 1011 &max_labels); 1012 } else { 1013 max_via_alen = cfg->rc_via_alen; 1014 max_labels = cfg->rc_output_labels; 1015 nhs = 1; 1016 } 1017 1018 if (nhs == 0) { 1019 NL_SET_ERR_MSG(extack, "Route does not contain a nexthop"); 1020 goto errout; 1021 } 1022 1023 err = -ENOMEM; 1024 rt = mpls_rt_alloc(nhs, max_via_alen, max_labels); 1025 if (IS_ERR(rt)) { 1026 err = PTR_ERR(rt); 1027 goto errout; 1028 } 1029 1030 rt->rt_protocol = cfg->rc_protocol; 1031 rt->rt_payload_type = cfg->rc_payload_type; 1032 rt->rt_ttl_propagate = cfg->rc_ttl_propagate; 1033 1034 if (cfg->rc_mp) 1035 err = mpls_nh_build_multi(cfg, rt, max_labels, extack); 1036 else 1037 err = mpls_nh_build_from_cfg(cfg, rt); 1038 if (err) 1039 goto freert; 1040 1041 mpls_route_update(net, index, rt, &cfg->rc_nlinfo); 1042 1043 return 0; 1044 1045 freert: 1046 mpls_rt_free(rt); 1047 errout: 1048 return err; 1049 } 1050 1051 static int mpls_route_del(struct mpls_route_config *cfg, 1052 struct netlink_ext_ack *extack) 1053 { 1054 struct net *net = cfg->rc_nlinfo.nl_net; 1055 unsigned index; 1056 int err = -EINVAL; 1057 1058 index = cfg->rc_label; 1059 1060 if (!mpls_label_ok(net, &index, extack)) 1061 goto errout; 1062 1063 mpls_route_update(net, index, NULL, &cfg->rc_nlinfo); 1064 1065 err = 0; 1066 errout: 1067 return err; 1068 } 1069 1070 static void mpls_get_stats(struct mpls_dev *mdev, 1071 struct mpls_link_stats *stats) 1072 { 1073 struct mpls_pcpu_stats *p; 1074 int i; 1075 1076 memset(stats, 0, sizeof(*stats)); 1077 1078 for_each_possible_cpu(i) { 1079 struct mpls_link_stats local; 1080 unsigned int start; 1081 1082 p = per_cpu_ptr(mdev->stats, i); 1083 do { 1084 start = u64_stats_fetch_begin(&p->syncp); 1085 local = p->stats; 1086 } while (u64_stats_fetch_retry(&p->syncp, start)); 1087 1088 stats->rx_packets += local.rx_packets; 1089 stats->rx_bytes += local.rx_bytes; 1090 stats->tx_packets += local.tx_packets; 1091 stats->tx_bytes += local.tx_bytes; 1092 stats->rx_errors += local.rx_errors; 1093 stats->tx_errors += local.tx_errors; 1094 stats->rx_dropped += local.rx_dropped; 1095 stats->tx_dropped += local.tx_dropped; 1096 stats->rx_noroute += local.rx_noroute; 1097 } 1098 } 1099 1100 static int mpls_fill_stats_af(struct sk_buff *skb, 1101 const struct net_device *dev) 1102 { 1103 struct mpls_link_stats *stats; 1104 struct mpls_dev *mdev; 1105 struct nlattr *nla; 1106 1107 mdev = mpls_dev_get(dev); 1108 if (!mdev) 1109 return -ENODATA; 1110 1111 nla = nla_reserve_64bit(skb, MPLS_STATS_LINK, 1112 sizeof(struct mpls_link_stats), 1113 MPLS_STATS_UNSPEC); 1114 if (!nla) 1115 return -EMSGSIZE; 1116 1117 stats = nla_data(nla); 1118 mpls_get_stats(mdev, stats); 1119 1120 return 0; 1121 } 1122 1123 static size_t mpls_get_stats_af_size(const struct net_device *dev) 1124 { 1125 struct mpls_dev *mdev; 1126 1127 mdev = mpls_dev_get(dev); 1128 if (!mdev) 1129 return 0; 1130 1131 return nla_total_size_64bit(sizeof(struct mpls_link_stats)); 1132 } 1133 1134 static int mpls_netconf_fill_devconf(struct sk_buff *skb, struct mpls_dev *mdev, 1135 u32 portid, u32 seq, int event, 1136 unsigned int flags, int type) 1137 { 1138 struct nlmsghdr *nlh; 1139 struct netconfmsg *ncm; 1140 bool all = false; 1141 1142 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 1143 flags); 1144 if (!nlh) 1145 return -EMSGSIZE; 1146 1147 if (type == NETCONFA_ALL) 1148 all = true; 1149 1150 ncm = nlmsg_data(nlh); 1151 ncm->ncm_family = AF_MPLS; 1152 1153 if (nla_put_s32(skb, NETCONFA_IFINDEX, mdev->dev->ifindex) < 0) 1154 goto nla_put_failure; 1155 1156 if ((all || type == NETCONFA_INPUT) && 1157 nla_put_s32(skb, NETCONFA_INPUT, 1158 mdev->input_enabled) < 0) 1159 goto nla_put_failure; 1160 1161 nlmsg_end(skb, nlh); 1162 return 0; 1163 1164 nla_put_failure: 1165 nlmsg_cancel(skb, nlh); 1166 return -EMSGSIZE; 1167 } 1168 1169 static int mpls_netconf_msgsize_devconf(int type) 1170 { 1171 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 1172 + nla_total_size(4); /* NETCONFA_IFINDEX */ 1173 bool all = false; 1174 1175 if (type == NETCONFA_ALL) 1176 all = true; 1177 1178 if (all || type == NETCONFA_INPUT) 1179 size += nla_total_size(4); 1180 1181 return size; 1182 } 1183 1184 static void mpls_netconf_notify_devconf(struct net *net, int event, 1185 int type, struct mpls_dev *mdev) 1186 { 1187 struct sk_buff *skb; 1188 int err = -ENOBUFS; 1189 1190 skb = nlmsg_new(mpls_netconf_msgsize_devconf(type), GFP_KERNEL); 1191 if (!skb) 1192 goto errout; 1193 1194 err = mpls_netconf_fill_devconf(skb, mdev, 0, 0, event, 0, type); 1195 if (err < 0) { 1196 /* -EMSGSIZE implies BUG in mpls_netconf_msgsize_devconf() */ 1197 WARN_ON(err == -EMSGSIZE); 1198 kfree_skb(skb); 1199 goto errout; 1200 } 1201 1202 rtnl_notify(skb, net, 0, RTNLGRP_MPLS_NETCONF, NULL, GFP_KERNEL); 1203 return; 1204 errout: 1205 if (err < 0) 1206 rtnl_set_sk_err(net, RTNLGRP_MPLS_NETCONF, err); 1207 } 1208 1209 static const struct nla_policy devconf_mpls_policy[NETCONFA_MAX + 1] = { 1210 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 1211 }; 1212 1213 static int mpls_netconf_valid_get_req(struct sk_buff *skb, 1214 const struct nlmsghdr *nlh, 1215 struct nlattr **tb, 1216 struct netlink_ext_ack *extack) 1217 { 1218 int i, err; 1219 1220 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) { 1221 NL_SET_ERR_MSG_MOD(extack, 1222 "Invalid header for netconf get request"); 1223 return -EINVAL; 1224 } 1225 1226 if (!netlink_strict_get_check(skb)) 1227 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg), 1228 tb, NETCONFA_MAX, 1229 devconf_mpls_policy, extack); 1230 1231 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg), 1232 tb, NETCONFA_MAX, 1233 devconf_mpls_policy, extack); 1234 if (err) 1235 return err; 1236 1237 for (i = 0; i <= NETCONFA_MAX; i++) { 1238 if (!tb[i]) 1239 continue; 1240 1241 switch (i) { 1242 case NETCONFA_IFINDEX: 1243 break; 1244 default: 1245 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request"); 1246 return -EINVAL; 1247 } 1248 } 1249 1250 return 0; 1251 } 1252 1253 static int mpls_netconf_get_devconf(struct sk_buff *in_skb, 1254 struct nlmsghdr *nlh, 1255 struct netlink_ext_ack *extack) 1256 { 1257 struct net *net = sock_net(in_skb->sk); 1258 struct nlattr *tb[NETCONFA_MAX + 1]; 1259 struct net_device *dev; 1260 struct mpls_dev *mdev; 1261 struct sk_buff *skb; 1262 int ifindex; 1263 int err; 1264 1265 err = mpls_netconf_valid_get_req(in_skb, nlh, tb, extack); 1266 if (err < 0) 1267 goto errout; 1268 1269 err = -EINVAL; 1270 if (!tb[NETCONFA_IFINDEX]) 1271 goto errout; 1272 1273 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 1274 dev = __dev_get_by_index(net, ifindex); 1275 if (!dev) 1276 goto errout; 1277 1278 mdev = mpls_dev_get(dev); 1279 if (!mdev) 1280 goto errout; 1281 1282 err = -ENOBUFS; 1283 skb = nlmsg_new(mpls_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL); 1284 if (!skb) 1285 goto errout; 1286 1287 err = mpls_netconf_fill_devconf(skb, mdev, 1288 NETLINK_CB(in_skb).portid, 1289 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 1290 NETCONFA_ALL); 1291 if (err < 0) { 1292 /* -EMSGSIZE implies BUG in mpls_netconf_msgsize_devconf() */ 1293 WARN_ON(err == -EMSGSIZE); 1294 kfree_skb(skb); 1295 goto errout; 1296 } 1297 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 1298 errout: 1299 return err; 1300 } 1301 1302 static int mpls_netconf_dump_devconf(struct sk_buff *skb, 1303 struct netlink_callback *cb) 1304 { 1305 const struct nlmsghdr *nlh = cb->nlh; 1306 struct net *net = sock_net(skb->sk); 1307 struct hlist_head *head; 1308 struct net_device *dev; 1309 struct mpls_dev *mdev; 1310 int idx, s_idx; 1311 int h, s_h; 1312 1313 if (cb->strict_check) { 1314 struct netlink_ext_ack *extack = cb->extack; 1315 struct netconfmsg *ncm; 1316 1317 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) { 1318 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request"); 1319 return -EINVAL; 1320 } 1321 1322 if (nlmsg_attrlen(nlh, sizeof(*ncm))) { 1323 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request"); 1324 return -EINVAL; 1325 } 1326 } 1327 1328 s_h = cb->args[0]; 1329 s_idx = idx = cb->args[1]; 1330 1331 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 1332 idx = 0; 1333 head = &net->dev_index_head[h]; 1334 rcu_read_lock(); 1335 cb->seq = net->dev_base_seq; 1336 hlist_for_each_entry_rcu(dev, head, index_hlist) { 1337 if (idx < s_idx) 1338 goto cont; 1339 mdev = mpls_dev_get(dev); 1340 if (!mdev) 1341 goto cont; 1342 if (mpls_netconf_fill_devconf(skb, mdev, 1343 NETLINK_CB(cb->skb).portid, 1344 nlh->nlmsg_seq, 1345 RTM_NEWNETCONF, 1346 NLM_F_MULTI, 1347 NETCONFA_ALL) < 0) { 1348 rcu_read_unlock(); 1349 goto done; 1350 } 1351 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 1352 cont: 1353 idx++; 1354 } 1355 rcu_read_unlock(); 1356 } 1357 done: 1358 cb->args[0] = h; 1359 cb->args[1] = idx; 1360 1361 return skb->len; 1362 } 1363 1364 #define MPLS_PERDEV_SYSCTL_OFFSET(field) \ 1365 (&((struct mpls_dev *)0)->field) 1366 1367 static int mpls_conf_proc(struct ctl_table *ctl, int write, 1368 void __user *buffer, 1369 size_t *lenp, loff_t *ppos) 1370 { 1371 int oval = *(int *)ctl->data; 1372 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 1373 1374 if (write) { 1375 struct mpls_dev *mdev = ctl->extra1; 1376 int i = (int *)ctl->data - (int *)mdev; 1377 struct net *net = ctl->extra2; 1378 int val = *(int *)ctl->data; 1379 1380 if (i == offsetof(struct mpls_dev, input_enabled) && 1381 val != oval) { 1382 mpls_netconf_notify_devconf(net, RTM_NEWNETCONF, 1383 NETCONFA_INPUT, mdev); 1384 } 1385 } 1386 1387 return ret; 1388 } 1389 1390 static const struct ctl_table mpls_dev_table[] = { 1391 { 1392 .procname = "input", 1393 .maxlen = sizeof(int), 1394 .mode = 0644, 1395 .proc_handler = mpls_conf_proc, 1396 .data = MPLS_PERDEV_SYSCTL_OFFSET(input_enabled), 1397 }, 1398 { } 1399 }; 1400 1401 static int mpls_dev_sysctl_register(struct net_device *dev, 1402 struct mpls_dev *mdev) 1403 { 1404 char path[sizeof("net/mpls/conf/") + IFNAMSIZ]; 1405 struct net *net = dev_net(dev); 1406 struct ctl_table *table; 1407 int i; 1408 1409 table = kmemdup(&mpls_dev_table, sizeof(mpls_dev_table), GFP_KERNEL); 1410 if (!table) 1411 goto out; 1412 1413 /* Table data contains only offsets relative to the base of 1414 * the mdev at this point, so make them absolute. 1415 */ 1416 for (i = 0; i < ARRAY_SIZE(mpls_dev_table); i++) { 1417 table[i].data = (char *)mdev + (uintptr_t)table[i].data; 1418 table[i].extra1 = mdev; 1419 table[i].extra2 = net; 1420 } 1421 1422 snprintf(path, sizeof(path), "net/mpls/conf/%s", dev->name); 1423 1424 mdev->sysctl = register_net_sysctl(net, path, table); 1425 if (!mdev->sysctl) 1426 goto free; 1427 1428 mpls_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, mdev); 1429 return 0; 1430 1431 free: 1432 kfree(table); 1433 out: 1434 return -ENOBUFS; 1435 } 1436 1437 static void mpls_dev_sysctl_unregister(struct net_device *dev, 1438 struct mpls_dev *mdev) 1439 { 1440 struct net *net = dev_net(dev); 1441 struct ctl_table *table; 1442 1443 table = mdev->sysctl->ctl_table_arg; 1444 unregister_net_sysctl_table(mdev->sysctl); 1445 kfree(table); 1446 1447 mpls_netconf_notify_devconf(net, RTM_DELNETCONF, 0, mdev); 1448 } 1449 1450 static struct mpls_dev *mpls_add_dev(struct net_device *dev) 1451 { 1452 struct mpls_dev *mdev; 1453 int err = -ENOMEM; 1454 int i; 1455 1456 ASSERT_RTNL(); 1457 1458 mdev = kzalloc(sizeof(*mdev), GFP_KERNEL); 1459 if (!mdev) 1460 return ERR_PTR(err); 1461 1462 mdev->stats = alloc_percpu(struct mpls_pcpu_stats); 1463 if (!mdev->stats) 1464 goto free; 1465 1466 for_each_possible_cpu(i) { 1467 struct mpls_pcpu_stats *mpls_stats; 1468 1469 mpls_stats = per_cpu_ptr(mdev->stats, i); 1470 u64_stats_init(&mpls_stats->syncp); 1471 } 1472 1473 mdev->dev = dev; 1474 1475 err = mpls_dev_sysctl_register(dev, mdev); 1476 if (err) 1477 goto free; 1478 1479 rcu_assign_pointer(dev->mpls_ptr, mdev); 1480 1481 return mdev; 1482 1483 free: 1484 free_percpu(mdev->stats); 1485 kfree(mdev); 1486 return ERR_PTR(err); 1487 } 1488 1489 static void mpls_dev_destroy_rcu(struct rcu_head *head) 1490 { 1491 struct mpls_dev *mdev = container_of(head, struct mpls_dev, rcu); 1492 1493 free_percpu(mdev->stats); 1494 kfree(mdev); 1495 } 1496 1497 static void mpls_ifdown(struct net_device *dev, int event) 1498 { 1499 struct mpls_route __rcu **platform_label; 1500 struct net *net = dev_net(dev); 1501 u8 alive, deleted; 1502 unsigned index; 1503 1504 platform_label = rtnl_dereference(net->mpls.platform_label); 1505 for (index = 0; index < net->mpls.platform_labels; index++) { 1506 struct mpls_route *rt = rtnl_dereference(platform_label[index]); 1507 1508 if (!rt) 1509 continue; 1510 1511 alive = 0; 1512 deleted = 0; 1513 change_nexthops(rt) { 1514 unsigned int nh_flags = nh->nh_flags; 1515 1516 if (rtnl_dereference(nh->nh_dev) != dev) 1517 goto next; 1518 1519 switch (event) { 1520 case NETDEV_DOWN: 1521 case NETDEV_UNREGISTER: 1522 nh_flags |= RTNH_F_DEAD; 1523 /* fall through */ 1524 case NETDEV_CHANGE: 1525 nh_flags |= RTNH_F_LINKDOWN; 1526 break; 1527 } 1528 if (event == NETDEV_UNREGISTER) 1529 RCU_INIT_POINTER(nh->nh_dev, NULL); 1530 1531 if (nh->nh_flags != nh_flags) 1532 WRITE_ONCE(nh->nh_flags, nh_flags); 1533 next: 1534 if (!(nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN))) 1535 alive++; 1536 if (!rtnl_dereference(nh->nh_dev)) 1537 deleted++; 1538 } endfor_nexthops(rt); 1539 1540 WRITE_ONCE(rt->rt_nhn_alive, alive); 1541 1542 /* if there are no more nexthops, delete the route */ 1543 if (event == NETDEV_UNREGISTER && deleted == rt->rt_nhn) 1544 mpls_route_update(net, index, NULL, NULL); 1545 } 1546 } 1547 1548 static void mpls_ifup(struct net_device *dev, unsigned int flags) 1549 { 1550 struct mpls_route __rcu **platform_label; 1551 struct net *net = dev_net(dev); 1552 unsigned index; 1553 u8 alive; 1554 1555 platform_label = rtnl_dereference(net->mpls.platform_label); 1556 for (index = 0; index < net->mpls.platform_labels; index++) { 1557 struct mpls_route *rt = rtnl_dereference(platform_label[index]); 1558 1559 if (!rt) 1560 continue; 1561 1562 alive = 0; 1563 change_nexthops(rt) { 1564 unsigned int nh_flags = nh->nh_flags; 1565 struct net_device *nh_dev = 1566 rtnl_dereference(nh->nh_dev); 1567 1568 if (!(nh_flags & flags)) { 1569 alive++; 1570 continue; 1571 } 1572 if (nh_dev != dev) 1573 continue; 1574 alive++; 1575 nh_flags &= ~flags; 1576 WRITE_ONCE(nh->nh_flags, nh_flags); 1577 } endfor_nexthops(rt); 1578 1579 WRITE_ONCE(rt->rt_nhn_alive, alive); 1580 } 1581 } 1582 1583 static int mpls_dev_notify(struct notifier_block *this, unsigned long event, 1584 void *ptr) 1585 { 1586 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1587 struct mpls_dev *mdev; 1588 unsigned int flags; 1589 1590 if (event == NETDEV_REGISTER) { 1591 1592 /* For now just support Ethernet, IPGRE, IP6GRE, SIT and 1593 * IPIP devices 1594 */ 1595 if (dev->type == ARPHRD_ETHER || 1596 dev->type == ARPHRD_LOOPBACK || 1597 dev->type == ARPHRD_IPGRE || 1598 dev->type == ARPHRD_IP6GRE || 1599 dev->type == ARPHRD_SIT || 1600 dev->type == ARPHRD_TUNNEL) { 1601 mdev = mpls_add_dev(dev); 1602 if (IS_ERR(mdev)) 1603 return notifier_from_errno(PTR_ERR(mdev)); 1604 } 1605 return NOTIFY_OK; 1606 } 1607 1608 mdev = mpls_dev_get(dev); 1609 if (!mdev) 1610 return NOTIFY_OK; 1611 1612 switch (event) { 1613 case NETDEV_DOWN: 1614 mpls_ifdown(dev, event); 1615 break; 1616 case NETDEV_UP: 1617 flags = dev_get_flags(dev); 1618 if (flags & (IFF_RUNNING | IFF_LOWER_UP)) 1619 mpls_ifup(dev, RTNH_F_DEAD | RTNH_F_LINKDOWN); 1620 else 1621 mpls_ifup(dev, RTNH_F_DEAD); 1622 break; 1623 case NETDEV_CHANGE: 1624 flags = dev_get_flags(dev); 1625 if (flags & (IFF_RUNNING | IFF_LOWER_UP)) 1626 mpls_ifup(dev, RTNH_F_DEAD | RTNH_F_LINKDOWN); 1627 else 1628 mpls_ifdown(dev, event); 1629 break; 1630 case NETDEV_UNREGISTER: 1631 mpls_ifdown(dev, event); 1632 mdev = mpls_dev_get(dev); 1633 if (mdev) { 1634 mpls_dev_sysctl_unregister(dev, mdev); 1635 RCU_INIT_POINTER(dev->mpls_ptr, NULL); 1636 call_rcu(&mdev->rcu, mpls_dev_destroy_rcu); 1637 } 1638 break; 1639 case NETDEV_CHANGENAME: 1640 mdev = mpls_dev_get(dev); 1641 if (mdev) { 1642 int err; 1643 1644 mpls_dev_sysctl_unregister(dev, mdev); 1645 err = mpls_dev_sysctl_register(dev, mdev); 1646 if (err) 1647 return notifier_from_errno(err); 1648 } 1649 break; 1650 } 1651 return NOTIFY_OK; 1652 } 1653 1654 static struct notifier_block mpls_dev_notifier = { 1655 .notifier_call = mpls_dev_notify, 1656 }; 1657 1658 static int nla_put_via(struct sk_buff *skb, 1659 u8 table, const void *addr, int alen) 1660 { 1661 static const int table_to_family[NEIGH_NR_TABLES + 1] = { 1662 AF_INET, AF_INET6, AF_DECnet, AF_PACKET, 1663 }; 1664 struct nlattr *nla; 1665 struct rtvia *via; 1666 int family = AF_UNSPEC; 1667 1668 nla = nla_reserve(skb, RTA_VIA, alen + 2); 1669 if (!nla) 1670 return -EMSGSIZE; 1671 1672 if (table <= NEIGH_NR_TABLES) 1673 family = table_to_family[table]; 1674 1675 via = nla_data(nla); 1676 via->rtvia_family = family; 1677 memcpy(via->rtvia_addr, addr, alen); 1678 return 0; 1679 } 1680 1681 int nla_put_labels(struct sk_buff *skb, int attrtype, 1682 u8 labels, const u32 label[]) 1683 { 1684 struct nlattr *nla; 1685 struct mpls_shim_hdr *nla_label; 1686 bool bos; 1687 int i; 1688 nla = nla_reserve(skb, attrtype, labels*4); 1689 if (!nla) 1690 return -EMSGSIZE; 1691 1692 nla_label = nla_data(nla); 1693 bos = true; 1694 for (i = labels - 1; i >= 0; i--) { 1695 nla_label[i] = mpls_entry_encode(label[i], 0, 0, bos); 1696 bos = false; 1697 } 1698 1699 return 0; 1700 } 1701 EXPORT_SYMBOL_GPL(nla_put_labels); 1702 1703 int nla_get_labels(const struct nlattr *nla, u8 max_labels, u8 *labels, 1704 u32 label[], struct netlink_ext_ack *extack) 1705 { 1706 unsigned len = nla_len(nla); 1707 struct mpls_shim_hdr *nla_label; 1708 u8 nla_labels; 1709 bool bos; 1710 int i; 1711 1712 /* len needs to be an even multiple of 4 (the label size). Number 1713 * of labels is a u8 so check for overflow. 1714 */ 1715 if (len & 3 || len / 4 > 255) { 1716 NL_SET_ERR_MSG_ATTR(extack, nla, 1717 "Invalid length for labels attribute"); 1718 return -EINVAL; 1719 } 1720 1721 /* Limit the number of new labels allowed */ 1722 nla_labels = len/4; 1723 if (nla_labels > max_labels) { 1724 NL_SET_ERR_MSG(extack, "Too many labels"); 1725 return -EINVAL; 1726 } 1727 1728 /* when label == NULL, caller wants number of labels */ 1729 if (!label) 1730 goto out; 1731 1732 nla_label = nla_data(nla); 1733 bos = true; 1734 for (i = nla_labels - 1; i >= 0; i--, bos = false) { 1735 struct mpls_entry_decoded dec; 1736 dec = mpls_entry_decode(nla_label + i); 1737 1738 /* Ensure the bottom of stack flag is properly set 1739 * and ttl and tc are both clear. 1740 */ 1741 if (dec.ttl) { 1742 NL_SET_ERR_MSG_ATTR(extack, nla, 1743 "TTL in label must be 0"); 1744 return -EINVAL; 1745 } 1746 1747 if (dec.tc) { 1748 NL_SET_ERR_MSG_ATTR(extack, nla, 1749 "Traffic class in label must be 0"); 1750 return -EINVAL; 1751 } 1752 1753 if (dec.bos != bos) { 1754 NL_SET_BAD_ATTR(extack, nla); 1755 if (bos) { 1756 NL_SET_ERR_MSG(extack, 1757 "BOS bit must be set in first label"); 1758 } else { 1759 NL_SET_ERR_MSG(extack, 1760 "BOS bit can only be set in first label"); 1761 } 1762 return -EINVAL; 1763 } 1764 1765 switch (dec.label) { 1766 case MPLS_LABEL_IMPLNULL: 1767 /* RFC3032: This is a label that an LSR may 1768 * assign and distribute, but which never 1769 * actually appears in the encapsulation. 1770 */ 1771 NL_SET_ERR_MSG_ATTR(extack, nla, 1772 "Implicit NULL Label (3) can not be used in encapsulation"); 1773 return -EINVAL; 1774 } 1775 1776 label[i] = dec.label; 1777 } 1778 out: 1779 *labels = nla_labels; 1780 return 0; 1781 } 1782 EXPORT_SYMBOL_GPL(nla_get_labels); 1783 1784 static int rtm_to_route_config(struct sk_buff *skb, 1785 struct nlmsghdr *nlh, 1786 struct mpls_route_config *cfg, 1787 struct netlink_ext_ack *extack) 1788 { 1789 struct rtmsg *rtm; 1790 struct nlattr *tb[RTA_MAX+1]; 1791 int index; 1792 int err; 1793 1794 err = nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX, 1795 rtm_mpls_policy, extack); 1796 if (err < 0) 1797 goto errout; 1798 1799 err = -EINVAL; 1800 rtm = nlmsg_data(nlh); 1801 1802 if (rtm->rtm_family != AF_MPLS) { 1803 NL_SET_ERR_MSG(extack, "Invalid address family in rtmsg"); 1804 goto errout; 1805 } 1806 if (rtm->rtm_dst_len != 20) { 1807 NL_SET_ERR_MSG(extack, "rtm_dst_len must be 20 for MPLS"); 1808 goto errout; 1809 } 1810 if (rtm->rtm_src_len != 0) { 1811 NL_SET_ERR_MSG(extack, "rtm_src_len must be 0 for MPLS"); 1812 goto errout; 1813 } 1814 if (rtm->rtm_tos != 0) { 1815 NL_SET_ERR_MSG(extack, "rtm_tos must be 0 for MPLS"); 1816 goto errout; 1817 } 1818 if (rtm->rtm_table != RT_TABLE_MAIN) { 1819 NL_SET_ERR_MSG(extack, 1820 "MPLS only supports the main route table"); 1821 goto errout; 1822 } 1823 /* Any value is acceptable for rtm_protocol */ 1824 1825 /* As mpls uses destination specific addresses 1826 * (or source specific address in the case of multicast) 1827 * all addresses have universal scope. 1828 */ 1829 if (rtm->rtm_scope != RT_SCOPE_UNIVERSE) { 1830 NL_SET_ERR_MSG(extack, 1831 "Invalid route scope - MPLS only supports UNIVERSE"); 1832 goto errout; 1833 } 1834 if (rtm->rtm_type != RTN_UNICAST) { 1835 NL_SET_ERR_MSG(extack, 1836 "Invalid route type - MPLS only supports UNICAST"); 1837 goto errout; 1838 } 1839 if (rtm->rtm_flags != 0) { 1840 NL_SET_ERR_MSG(extack, "rtm_flags must be 0 for MPLS"); 1841 goto errout; 1842 } 1843 1844 cfg->rc_label = LABEL_NOT_SPECIFIED; 1845 cfg->rc_protocol = rtm->rtm_protocol; 1846 cfg->rc_via_table = MPLS_NEIGH_TABLE_UNSPEC; 1847 cfg->rc_ttl_propagate = MPLS_TTL_PROP_DEFAULT; 1848 cfg->rc_nlflags = nlh->nlmsg_flags; 1849 cfg->rc_nlinfo.portid = NETLINK_CB(skb).portid; 1850 cfg->rc_nlinfo.nlh = nlh; 1851 cfg->rc_nlinfo.nl_net = sock_net(skb->sk); 1852 1853 for (index = 0; index <= RTA_MAX; index++) { 1854 struct nlattr *nla = tb[index]; 1855 if (!nla) 1856 continue; 1857 1858 switch (index) { 1859 case RTA_OIF: 1860 cfg->rc_ifindex = nla_get_u32(nla); 1861 break; 1862 case RTA_NEWDST: 1863 if (nla_get_labels(nla, MAX_NEW_LABELS, 1864 &cfg->rc_output_labels, 1865 cfg->rc_output_label, extack)) 1866 goto errout; 1867 break; 1868 case RTA_DST: 1869 { 1870 u8 label_count; 1871 if (nla_get_labels(nla, 1, &label_count, 1872 &cfg->rc_label, extack)) 1873 goto errout; 1874 1875 if (!mpls_label_ok(cfg->rc_nlinfo.nl_net, 1876 &cfg->rc_label, extack)) 1877 goto errout; 1878 break; 1879 } 1880 case RTA_GATEWAY: 1881 NL_SET_ERR_MSG(extack, "MPLS does not support RTA_GATEWAY attribute"); 1882 goto errout; 1883 case RTA_VIA: 1884 { 1885 if (nla_get_via(nla, &cfg->rc_via_alen, 1886 &cfg->rc_via_table, cfg->rc_via, 1887 extack)) 1888 goto errout; 1889 break; 1890 } 1891 case RTA_MULTIPATH: 1892 { 1893 cfg->rc_mp = nla_data(nla); 1894 cfg->rc_mp_len = nla_len(nla); 1895 break; 1896 } 1897 case RTA_TTL_PROPAGATE: 1898 { 1899 u8 ttl_propagate = nla_get_u8(nla); 1900 1901 if (ttl_propagate > 1) { 1902 NL_SET_ERR_MSG_ATTR(extack, nla, 1903 "RTA_TTL_PROPAGATE can only be 0 or 1"); 1904 goto errout; 1905 } 1906 cfg->rc_ttl_propagate = ttl_propagate ? 1907 MPLS_TTL_PROP_ENABLED : 1908 MPLS_TTL_PROP_DISABLED; 1909 break; 1910 } 1911 default: 1912 NL_SET_ERR_MSG_ATTR(extack, nla, "Unknown attribute"); 1913 /* Unsupported attribute */ 1914 goto errout; 1915 } 1916 } 1917 1918 err = 0; 1919 errout: 1920 return err; 1921 } 1922 1923 static int mpls_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, 1924 struct netlink_ext_ack *extack) 1925 { 1926 struct mpls_route_config *cfg; 1927 int err; 1928 1929 cfg = kzalloc(sizeof(*cfg), GFP_KERNEL); 1930 if (!cfg) 1931 return -ENOMEM; 1932 1933 err = rtm_to_route_config(skb, nlh, cfg, extack); 1934 if (err < 0) 1935 goto out; 1936 1937 err = mpls_route_del(cfg, extack); 1938 out: 1939 kfree(cfg); 1940 1941 return err; 1942 } 1943 1944 1945 static int mpls_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, 1946 struct netlink_ext_ack *extack) 1947 { 1948 struct mpls_route_config *cfg; 1949 int err; 1950 1951 cfg = kzalloc(sizeof(*cfg), GFP_KERNEL); 1952 if (!cfg) 1953 return -ENOMEM; 1954 1955 err = rtm_to_route_config(skb, nlh, cfg, extack); 1956 if (err < 0) 1957 goto out; 1958 1959 err = mpls_route_add(cfg, extack); 1960 out: 1961 kfree(cfg); 1962 1963 return err; 1964 } 1965 1966 static int mpls_dump_route(struct sk_buff *skb, u32 portid, u32 seq, int event, 1967 u32 label, struct mpls_route *rt, int flags) 1968 { 1969 struct net_device *dev; 1970 struct nlmsghdr *nlh; 1971 struct rtmsg *rtm; 1972 1973 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*rtm), flags); 1974 if (nlh == NULL) 1975 return -EMSGSIZE; 1976 1977 rtm = nlmsg_data(nlh); 1978 rtm->rtm_family = AF_MPLS; 1979 rtm->rtm_dst_len = 20; 1980 rtm->rtm_src_len = 0; 1981 rtm->rtm_tos = 0; 1982 rtm->rtm_table = RT_TABLE_MAIN; 1983 rtm->rtm_protocol = rt->rt_protocol; 1984 rtm->rtm_scope = RT_SCOPE_UNIVERSE; 1985 rtm->rtm_type = RTN_UNICAST; 1986 rtm->rtm_flags = 0; 1987 1988 if (nla_put_labels(skb, RTA_DST, 1, &label)) 1989 goto nla_put_failure; 1990 1991 if (rt->rt_ttl_propagate != MPLS_TTL_PROP_DEFAULT) { 1992 bool ttl_propagate = 1993 rt->rt_ttl_propagate == MPLS_TTL_PROP_ENABLED; 1994 1995 if (nla_put_u8(skb, RTA_TTL_PROPAGATE, 1996 ttl_propagate)) 1997 goto nla_put_failure; 1998 } 1999 if (rt->rt_nhn == 1) { 2000 const struct mpls_nh *nh = rt->rt_nh; 2001 2002 if (nh->nh_labels && 2003 nla_put_labels(skb, RTA_NEWDST, nh->nh_labels, 2004 nh->nh_label)) 2005 goto nla_put_failure; 2006 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC && 2007 nla_put_via(skb, nh->nh_via_table, mpls_nh_via(rt, nh), 2008 nh->nh_via_alen)) 2009 goto nla_put_failure; 2010 dev = rtnl_dereference(nh->nh_dev); 2011 if (dev && nla_put_u32(skb, RTA_OIF, dev->ifindex)) 2012 goto nla_put_failure; 2013 if (nh->nh_flags & RTNH_F_LINKDOWN) 2014 rtm->rtm_flags |= RTNH_F_LINKDOWN; 2015 if (nh->nh_flags & RTNH_F_DEAD) 2016 rtm->rtm_flags |= RTNH_F_DEAD; 2017 } else { 2018 struct rtnexthop *rtnh; 2019 struct nlattr *mp; 2020 u8 linkdown = 0; 2021 u8 dead = 0; 2022 2023 mp = nla_nest_start_noflag(skb, RTA_MULTIPATH); 2024 if (!mp) 2025 goto nla_put_failure; 2026 2027 for_nexthops(rt) { 2028 dev = rtnl_dereference(nh->nh_dev); 2029 if (!dev) 2030 continue; 2031 2032 rtnh = nla_reserve_nohdr(skb, sizeof(*rtnh)); 2033 if (!rtnh) 2034 goto nla_put_failure; 2035 2036 rtnh->rtnh_ifindex = dev->ifindex; 2037 if (nh->nh_flags & RTNH_F_LINKDOWN) { 2038 rtnh->rtnh_flags |= RTNH_F_LINKDOWN; 2039 linkdown++; 2040 } 2041 if (nh->nh_flags & RTNH_F_DEAD) { 2042 rtnh->rtnh_flags |= RTNH_F_DEAD; 2043 dead++; 2044 } 2045 2046 if (nh->nh_labels && nla_put_labels(skb, RTA_NEWDST, 2047 nh->nh_labels, 2048 nh->nh_label)) 2049 goto nla_put_failure; 2050 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC && 2051 nla_put_via(skb, nh->nh_via_table, 2052 mpls_nh_via(rt, nh), 2053 nh->nh_via_alen)) 2054 goto nla_put_failure; 2055 2056 /* length of rtnetlink header + attributes */ 2057 rtnh->rtnh_len = nlmsg_get_pos(skb) - (void *)rtnh; 2058 } endfor_nexthops(rt); 2059 2060 if (linkdown == rt->rt_nhn) 2061 rtm->rtm_flags |= RTNH_F_LINKDOWN; 2062 if (dead == rt->rt_nhn) 2063 rtm->rtm_flags |= RTNH_F_DEAD; 2064 2065 nla_nest_end(skb, mp); 2066 } 2067 2068 nlmsg_end(skb, nlh); 2069 return 0; 2070 2071 nla_put_failure: 2072 nlmsg_cancel(skb, nlh); 2073 return -EMSGSIZE; 2074 } 2075 2076 #if IS_ENABLED(CONFIG_INET) 2077 static int mpls_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh, 2078 struct fib_dump_filter *filter, 2079 struct netlink_callback *cb) 2080 { 2081 return ip_valid_fib_dump_req(net, nlh, filter, cb); 2082 } 2083 #else 2084 static int mpls_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh, 2085 struct fib_dump_filter *filter, 2086 struct netlink_callback *cb) 2087 { 2088 struct netlink_ext_ack *extack = cb->extack; 2089 struct nlattr *tb[RTA_MAX + 1]; 2090 struct rtmsg *rtm; 2091 int err, i; 2092 2093 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) { 2094 NL_SET_ERR_MSG_MOD(extack, "Invalid header for FIB dump request"); 2095 return -EINVAL; 2096 } 2097 2098 rtm = nlmsg_data(nlh); 2099 if (rtm->rtm_dst_len || rtm->rtm_src_len || rtm->rtm_tos || 2100 rtm->rtm_table || rtm->rtm_scope || rtm->rtm_type || 2101 rtm->rtm_flags) { 2102 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for FIB dump request"); 2103 return -EINVAL; 2104 } 2105 2106 if (rtm->rtm_protocol) { 2107 filter->protocol = rtm->rtm_protocol; 2108 filter->filter_set = 1; 2109 cb->answer_flags = NLM_F_DUMP_FILTERED; 2110 } 2111 2112 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX, 2113 rtm_mpls_policy, extack); 2114 if (err < 0) 2115 return err; 2116 2117 for (i = 0; i <= RTA_MAX; ++i) { 2118 int ifindex; 2119 2120 if (i == RTA_OIF) { 2121 ifindex = nla_get_u32(tb[i]); 2122 filter->dev = __dev_get_by_index(net, ifindex); 2123 if (!filter->dev) 2124 return -ENODEV; 2125 filter->filter_set = 1; 2126 } else if (tb[i]) { 2127 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request"); 2128 return -EINVAL; 2129 } 2130 } 2131 2132 return 0; 2133 } 2134 #endif 2135 2136 static bool mpls_rt_uses_dev(struct mpls_route *rt, 2137 const struct net_device *dev) 2138 { 2139 struct net_device *nh_dev; 2140 2141 if (rt->rt_nhn == 1) { 2142 struct mpls_nh *nh = rt->rt_nh; 2143 2144 nh_dev = rtnl_dereference(nh->nh_dev); 2145 if (dev == nh_dev) 2146 return true; 2147 } else { 2148 for_nexthops(rt) { 2149 nh_dev = rtnl_dereference(nh->nh_dev); 2150 if (nh_dev == dev) 2151 return true; 2152 } endfor_nexthops(rt); 2153 } 2154 2155 return false; 2156 } 2157 2158 static int mpls_dump_routes(struct sk_buff *skb, struct netlink_callback *cb) 2159 { 2160 const struct nlmsghdr *nlh = cb->nlh; 2161 struct net *net = sock_net(skb->sk); 2162 struct mpls_route __rcu **platform_label; 2163 struct fib_dump_filter filter = {}; 2164 unsigned int flags = NLM_F_MULTI; 2165 size_t platform_labels; 2166 unsigned int index; 2167 2168 ASSERT_RTNL(); 2169 2170 if (cb->strict_check) { 2171 int err; 2172 2173 err = mpls_valid_fib_dump_req(net, nlh, &filter, cb); 2174 if (err < 0) 2175 return err; 2176 2177 /* for MPLS, there is only 1 table with fixed type and flags. 2178 * If either are set in the filter then return nothing. 2179 */ 2180 if ((filter.table_id && filter.table_id != RT_TABLE_MAIN) || 2181 (filter.rt_type && filter.rt_type != RTN_UNICAST) || 2182 filter.flags) 2183 return skb->len; 2184 } 2185 2186 index = cb->args[0]; 2187 if (index < MPLS_LABEL_FIRST_UNRESERVED) 2188 index = MPLS_LABEL_FIRST_UNRESERVED; 2189 2190 platform_label = rtnl_dereference(net->mpls.platform_label); 2191 platform_labels = net->mpls.platform_labels; 2192 2193 if (filter.filter_set) 2194 flags |= NLM_F_DUMP_FILTERED; 2195 2196 for (; index < platform_labels; index++) { 2197 struct mpls_route *rt; 2198 2199 rt = rtnl_dereference(platform_label[index]); 2200 if (!rt) 2201 continue; 2202 2203 if ((filter.dev && !mpls_rt_uses_dev(rt, filter.dev)) || 2204 (filter.protocol && rt->rt_protocol != filter.protocol)) 2205 continue; 2206 2207 if (mpls_dump_route(skb, NETLINK_CB(cb->skb).portid, 2208 cb->nlh->nlmsg_seq, RTM_NEWROUTE, 2209 index, rt, flags) < 0) 2210 break; 2211 } 2212 cb->args[0] = index; 2213 2214 return skb->len; 2215 } 2216 2217 static inline size_t lfib_nlmsg_size(struct mpls_route *rt) 2218 { 2219 size_t payload = 2220 NLMSG_ALIGN(sizeof(struct rtmsg)) 2221 + nla_total_size(4) /* RTA_DST */ 2222 + nla_total_size(1); /* RTA_TTL_PROPAGATE */ 2223 2224 if (rt->rt_nhn == 1) { 2225 struct mpls_nh *nh = rt->rt_nh; 2226 2227 if (nh->nh_dev) 2228 payload += nla_total_size(4); /* RTA_OIF */ 2229 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC) /* RTA_VIA */ 2230 payload += nla_total_size(2 + nh->nh_via_alen); 2231 if (nh->nh_labels) /* RTA_NEWDST */ 2232 payload += nla_total_size(nh->nh_labels * 4); 2233 } else { 2234 /* each nexthop is packed in an attribute */ 2235 size_t nhsize = 0; 2236 2237 for_nexthops(rt) { 2238 if (!rtnl_dereference(nh->nh_dev)) 2239 continue; 2240 nhsize += nla_total_size(sizeof(struct rtnexthop)); 2241 /* RTA_VIA */ 2242 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC) 2243 nhsize += nla_total_size(2 + nh->nh_via_alen); 2244 if (nh->nh_labels) 2245 nhsize += nla_total_size(nh->nh_labels * 4); 2246 } endfor_nexthops(rt); 2247 /* nested attribute */ 2248 payload += nla_total_size(nhsize); 2249 } 2250 2251 return payload; 2252 } 2253 2254 static void rtmsg_lfib(int event, u32 label, struct mpls_route *rt, 2255 struct nlmsghdr *nlh, struct net *net, u32 portid, 2256 unsigned int nlm_flags) 2257 { 2258 struct sk_buff *skb; 2259 u32 seq = nlh ? nlh->nlmsg_seq : 0; 2260 int err = -ENOBUFS; 2261 2262 skb = nlmsg_new(lfib_nlmsg_size(rt), GFP_KERNEL); 2263 if (skb == NULL) 2264 goto errout; 2265 2266 err = mpls_dump_route(skb, portid, seq, event, label, rt, nlm_flags); 2267 if (err < 0) { 2268 /* -EMSGSIZE implies BUG in lfib_nlmsg_size */ 2269 WARN_ON(err == -EMSGSIZE); 2270 kfree_skb(skb); 2271 goto errout; 2272 } 2273 rtnl_notify(skb, net, portid, RTNLGRP_MPLS_ROUTE, nlh, GFP_KERNEL); 2274 2275 return; 2276 errout: 2277 if (err < 0) 2278 rtnl_set_sk_err(net, RTNLGRP_MPLS_ROUTE, err); 2279 } 2280 2281 static int mpls_valid_getroute_req(struct sk_buff *skb, 2282 const struct nlmsghdr *nlh, 2283 struct nlattr **tb, 2284 struct netlink_ext_ack *extack) 2285 { 2286 struct rtmsg *rtm; 2287 int i, err; 2288 2289 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) { 2290 NL_SET_ERR_MSG_MOD(extack, 2291 "Invalid header for get route request"); 2292 return -EINVAL; 2293 } 2294 2295 if (!netlink_strict_get_check(skb)) 2296 return nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX, 2297 rtm_mpls_policy, extack); 2298 2299 rtm = nlmsg_data(nlh); 2300 if ((rtm->rtm_dst_len && rtm->rtm_dst_len != 20) || 2301 rtm->rtm_src_len || rtm->rtm_tos || rtm->rtm_table || 2302 rtm->rtm_protocol || rtm->rtm_scope || rtm->rtm_type) { 2303 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get route request"); 2304 return -EINVAL; 2305 } 2306 if (rtm->rtm_flags & ~RTM_F_FIB_MATCH) { 2307 NL_SET_ERR_MSG_MOD(extack, 2308 "Invalid flags for get route request"); 2309 return -EINVAL; 2310 } 2311 2312 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX, 2313 rtm_mpls_policy, extack); 2314 if (err) 2315 return err; 2316 2317 if ((tb[RTA_DST] || tb[RTA_NEWDST]) && !rtm->rtm_dst_len) { 2318 NL_SET_ERR_MSG_MOD(extack, "rtm_dst_len must be 20 for MPLS"); 2319 return -EINVAL; 2320 } 2321 2322 for (i = 0; i <= RTA_MAX; i++) { 2323 if (!tb[i]) 2324 continue; 2325 2326 switch (i) { 2327 case RTA_DST: 2328 case RTA_NEWDST: 2329 break; 2330 default: 2331 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get route request"); 2332 return -EINVAL; 2333 } 2334 } 2335 2336 return 0; 2337 } 2338 2339 static int mpls_getroute(struct sk_buff *in_skb, struct nlmsghdr *in_nlh, 2340 struct netlink_ext_ack *extack) 2341 { 2342 struct net *net = sock_net(in_skb->sk); 2343 u32 portid = NETLINK_CB(in_skb).portid; 2344 u32 in_label = LABEL_NOT_SPECIFIED; 2345 struct nlattr *tb[RTA_MAX + 1]; 2346 u32 labels[MAX_NEW_LABELS]; 2347 struct mpls_shim_hdr *hdr; 2348 unsigned int hdr_size = 0; 2349 struct net_device *dev; 2350 struct mpls_route *rt; 2351 struct rtmsg *rtm, *r; 2352 struct nlmsghdr *nlh; 2353 struct sk_buff *skb; 2354 struct mpls_nh *nh; 2355 u8 n_labels; 2356 int err; 2357 2358 err = mpls_valid_getroute_req(in_skb, in_nlh, tb, extack); 2359 if (err < 0) 2360 goto errout; 2361 2362 rtm = nlmsg_data(in_nlh); 2363 2364 if (tb[RTA_DST]) { 2365 u8 label_count; 2366 2367 if (nla_get_labels(tb[RTA_DST], 1, &label_count, 2368 &in_label, extack)) { 2369 err = -EINVAL; 2370 goto errout; 2371 } 2372 2373 if (!mpls_label_ok(net, &in_label, extack)) { 2374 err = -EINVAL; 2375 goto errout; 2376 } 2377 } 2378 2379 rt = mpls_route_input_rcu(net, in_label); 2380 if (!rt) { 2381 err = -ENETUNREACH; 2382 goto errout; 2383 } 2384 2385 if (rtm->rtm_flags & RTM_F_FIB_MATCH) { 2386 skb = nlmsg_new(lfib_nlmsg_size(rt), GFP_KERNEL); 2387 if (!skb) { 2388 err = -ENOBUFS; 2389 goto errout; 2390 } 2391 2392 err = mpls_dump_route(skb, portid, in_nlh->nlmsg_seq, 2393 RTM_NEWROUTE, in_label, rt, 0); 2394 if (err < 0) { 2395 /* -EMSGSIZE implies BUG in lfib_nlmsg_size */ 2396 WARN_ON(err == -EMSGSIZE); 2397 goto errout_free; 2398 } 2399 2400 return rtnl_unicast(skb, net, portid); 2401 } 2402 2403 if (tb[RTA_NEWDST]) { 2404 if (nla_get_labels(tb[RTA_NEWDST], MAX_NEW_LABELS, &n_labels, 2405 labels, extack) != 0) { 2406 err = -EINVAL; 2407 goto errout; 2408 } 2409 2410 hdr_size = n_labels * sizeof(struct mpls_shim_hdr); 2411 } 2412 2413 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); 2414 if (!skb) { 2415 err = -ENOBUFS; 2416 goto errout; 2417 } 2418 2419 skb->protocol = htons(ETH_P_MPLS_UC); 2420 2421 if (hdr_size) { 2422 bool bos; 2423 int i; 2424 2425 if (skb_cow(skb, hdr_size)) { 2426 err = -ENOBUFS; 2427 goto errout_free; 2428 } 2429 2430 skb_reserve(skb, hdr_size); 2431 skb_push(skb, hdr_size); 2432 skb_reset_network_header(skb); 2433 2434 /* Push new labels */ 2435 hdr = mpls_hdr(skb); 2436 bos = true; 2437 for (i = n_labels - 1; i >= 0; i--) { 2438 hdr[i] = mpls_entry_encode(labels[i], 2439 1, 0, bos); 2440 bos = false; 2441 } 2442 } 2443 2444 nh = mpls_select_multipath(rt, skb); 2445 if (!nh) { 2446 err = -ENETUNREACH; 2447 goto errout_free; 2448 } 2449 2450 if (hdr_size) { 2451 skb_pull(skb, hdr_size); 2452 skb_reset_network_header(skb); 2453 } 2454 2455 nlh = nlmsg_put(skb, portid, in_nlh->nlmsg_seq, 2456 RTM_NEWROUTE, sizeof(*r), 0); 2457 if (!nlh) { 2458 err = -EMSGSIZE; 2459 goto errout_free; 2460 } 2461 2462 r = nlmsg_data(nlh); 2463 r->rtm_family = AF_MPLS; 2464 r->rtm_dst_len = 20; 2465 r->rtm_src_len = 0; 2466 r->rtm_table = RT_TABLE_MAIN; 2467 r->rtm_type = RTN_UNICAST; 2468 r->rtm_scope = RT_SCOPE_UNIVERSE; 2469 r->rtm_protocol = rt->rt_protocol; 2470 r->rtm_flags = 0; 2471 2472 if (nla_put_labels(skb, RTA_DST, 1, &in_label)) 2473 goto nla_put_failure; 2474 2475 if (nh->nh_labels && 2476 nla_put_labels(skb, RTA_NEWDST, nh->nh_labels, 2477 nh->nh_label)) 2478 goto nla_put_failure; 2479 2480 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC && 2481 nla_put_via(skb, nh->nh_via_table, mpls_nh_via(rt, nh), 2482 nh->nh_via_alen)) 2483 goto nla_put_failure; 2484 dev = rtnl_dereference(nh->nh_dev); 2485 if (dev && nla_put_u32(skb, RTA_OIF, dev->ifindex)) 2486 goto nla_put_failure; 2487 2488 nlmsg_end(skb, nlh); 2489 2490 err = rtnl_unicast(skb, net, portid); 2491 errout: 2492 return err; 2493 2494 nla_put_failure: 2495 nlmsg_cancel(skb, nlh); 2496 err = -EMSGSIZE; 2497 errout_free: 2498 kfree_skb(skb); 2499 return err; 2500 } 2501 2502 static int resize_platform_label_table(struct net *net, size_t limit) 2503 { 2504 size_t size = sizeof(struct mpls_route *) * limit; 2505 size_t old_limit; 2506 size_t cp_size; 2507 struct mpls_route __rcu **labels = NULL, **old; 2508 struct mpls_route *rt0 = NULL, *rt2 = NULL; 2509 unsigned index; 2510 2511 if (size) { 2512 labels = kvzalloc(size, GFP_KERNEL); 2513 if (!labels) 2514 goto nolabels; 2515 } 2516 2517 /* In case the predefined labels need to be populated */ 2518 if (limit > MPLS_LABEL_IPV4NULL) { 2519 struct net_device *lo = net->loopback_dev; 2520 rt0 = mpls_rt_alloc(1, lo->addr_len, 0); 2521 if (IS_ERR(rt0)) 2522 goto nort0; 2523 RCU_INIT_POINTER(rt0->rt_nh->nh_dev, lo); 2524 rt0->rt_protocol = RTPROT_KERNEL; 2525 rt0->rt_payload_type = MPT_IPV4; 2526 rt0->rt_ttl_propagate = MPLS_TTL_PROP_DEFAULT; 2527 rt0->rt_nh->nh_via_table = NEIGH_LINK_TABLE; 2528 rt0->rt_nh->nh_via_alen = lo->addr_len; 2529 memcpy(__mpls_nh_via(rt0, rt0->rt_nh), lo->dev_addr, 2530 lo->addr_len); 2531 } 2532 if (limit > MPLS_LABEL_IPV6NULL) { 2533 struct net_device *lo = net->loopback_dev; 2534 rt2 = mpls_rt_alloc(1, lo->addr_len, 0); 2535 if (IS_ERR(rt2)) 2536 goto nort2; 2537 RCU_INIT_POINTER(rt2->rt_nh->nh_dev, lo); 2538 rt2->rt_protocol = RTPROT_KERNEL; 2539 rt2->rt_payload_type = MPT_IPV6; 2540 rt2->rt_ttl_propagate = MPLS_TTL_PROP_DEFAULT; 2541 rt2->rt_nh->nh_via_table = NEIGH_LINK_TABLE; 2542 rt2->rt_nh->nh_via_alen = lo->addr_len; 2543 memcpy(__mpls_nh_via(rt2, rt2->rt_nh), lo->dev_addr, 2544 lo->addr_len); 2545 } 2546 2547 rtnl_lock(); 2548 /* Remember the original table */ 2549 old = rtnl_dereference(net->mpls.platform_label); 2550 old_limit = net->mpls.platform_labels; 2551 2552 /* Free any labels beyond the new table */ 2553 for (index = limit; index < old_limit; index++) 2554 mpls_route_update(net, index, NULL, NULL); 2555 2556 /* Copy over the old labels */ 2557 cp_size = size; 2558 if (old_limit < limit) 2559 cp_size = old_limit * sizeof(struct mpls_route *); 2560 2561 memcpy(labels, old, cp_size); 2562 2563 /* If needed set the predefined labels */ 2564 if ((old_limit <= MPLS_LABEL_IPV6NULL) && 2565 (limit > MPLS_LABEL_IPV6NULL)) { 2566 RCU_INIT_POINTER(labels[MPLS_LABEL_IPV6NULL], rt2); 2567 rt2 = NULL; 2568 } 2569 2570 if ((old_limit <= MPLS_LABEL_IPV4NULL) && 2571 (limit > MPLS_LABEL_IPV4NULL)) { 2572 RCU_INIT_POINTER(labels[MPLS_LABEL_IPV4NULL], rt0); 2573 rt0 = NULL; 2574 } 2575 2576 /* Update the global pointers */ 2577 net->mpls.platform_labels = limit; 2578 rcu_assign_pointer(net->mpls.platform_label, labels); 2579 2580 rtnl_unlock(); 2581 2582 mpls_rt_free(rt2); 2583 mpls_rt_free(rt0); 2584 2585 if (old) { 2586 synchronize_rcu(); 2587 kvfree(old); 2588 } 2589 return 0; 2590 2591 nort2: 2592 mpls_rt_free(rt0); 2593 nort0: 2594 kvfree(labels); 2595 nolabels: 2596 return -ENOMEM; 2597 } 2598 2599 static int mpls_platform_labels(struct ctl_table *table, int write, 2600 void __user *buffer, size_t *lenp, loff_t *ppos) 2601 { 2602 struct net *net = table->data; 2603 int platform_labels = net->mpls.platform_labels; 2604 int ret; 2605 struct ctl_table tmp = { 2606 .procname = table->procname, 2607 .data = &platform_labels, 2608 .maxlen = sizeof(int), 2609 .mode = table->mode, 2610 .extra1 = &zero, 2611 .extra2 = &label_limit, 2612 }; 2613 2614 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); 2615 2616 if (write && ret == 0) 2617 ret = resize_platform_label_table(net, platform_labels); 2618 2619 return ret; 2620 } 2621 2622 #define MPLS_NS_SYSCTL_OFFSET(field) \ 2623 (&((struct net *)0)->field) 2624 2625 static const struct ctl_table mpls_table[] = { 2626 { 2627 .procname = "platform_labels", 2628 .data = NULL, 2629 .maxlen = sizeof(int), 2630 .mode = 0644, 2631 .proc_handler = mpls_platform_labels, 2632 }, 2633 { 2634 .procname = "ip_ttl_propagate", 2635 .data = MPLS_NS_SYSCTL_OFFSET(mpls.ip_ttl_propagate), 2636 .maxlen = sizeof(int), 2637 .mode = 0644, 2638 .proc_handler = proc_dointvec_minmax, 2639 .extra1 = &zero, 2640 .extra2 = &one, 2641 }, 2642 { 2643 .procname = "default_ttl", 2644 .data = MPLS_NS_SYSCTL_OFFSET(mpls.default_ttl), 2645 .maxlen = sizeof(int), 2646 .mode = 0644, 2647 .proc_handler = proc_dointvec_minmax, 2648 .extra1 = &one, 2649 .extra2 = &ttl_max, 2650 }, 2651 { } 2652 }; 2653 2654 static int mpls_net_init(struct net *net) 2655 { 2656 struct ctl_table *table; 2657 int i; 2658 2659 net->mpls.platform_labels = 0; 2660 net->mpls.platform_label = NULL; 2661 net->mpls.ip_ttl_propagate = 1; 2662 net->mpls.default_ttl = 255; 2663 2664 table = kmemdup(mpls_table, sizeof(mpls_table), GFP_KERNEL); 2665 if (table == NULL) 2666 return -ENOMEM; 2667 2668 /* Table data contains only offsets relative to the base of 2669 * the mdev at this point, so make them absolute. 2670 */ 2671 for (i = 0; i < ARRAY_SIZE(mpls_table) - 1; i++) 2672 table[i].data = (char *)net + (uintptr_t)table[i].data; 2673 2674 net->mpls.ctl = register_net_sysctl(net, "net/mpls", table); 2675 if (net->mpls.ctl == NULL) { 2676 kfree(table); 2677 return -ENOMEM; 2678 } 2679 2680 return 0; 2681 } 2682 2683 static void mpls_net_exit(struct net *net) 2684 { 2685 struct mpls_route __rcu **platform_label; 2686 size_t platform_labels; 2687 struct ctl_table *table; 2688 unsigned int index; 2689 2690 table = net->mpls.ctl->ctl_table_arg; 2691 unregister_net_sysctl_table(net->mpls.ctl); 2692 kfree(table); 2693 2694 /* An rcu grace period has passed since there was a device in 2695 * the network namespace (and thus the last in flight packet) 2696 * left this network namespace. This is because 2697 * unregister_netdevice_many and netdev_run_todo has completed 2698 * for each network device that was in this network namespace. 2699 * 2700 * As such no additional rcu synchronization is necessary when 2701 * freeing the platform_label table. 2702 */ 2703 rtnl_lock(); 2704 platform_label = rtnl_dereference(net->mpls.platform_label); 2705 platform_labels = net->mpls.platform_labels; 2706 for (index = 0; index < platform_labels; index++) { 2707 struct mpls_route *rt = rtnl_dereference(platform_label[index]); 2708 RCU_INIT_POINTER(platform_label[index], NULL); 2709 mpls_notify_route(net, index, rt, NULL, NULL); 2710 mpls_rt_free(rt); 2711 } 2712 rtnl_unlock(); 2713 2714 kvfree(platform_label); 2715 } 2716 2717 static struct pernet_operations mpls_net_ops = { 2718 .init = mpls_net_init, 2719 .exit = mpls_net_exit, 2720 }; 2721 2722 static struct rtnl_af_ops mpls_af_ops __read_mostly = { 2723 .family = AF_MPLS, 2724 .fill_stats_af = mpls_fill_stats_af, 2725 .get_stats_af_size = mpls_get_stats_af_size, 2726 }; 2727 2728 static int __init mpls_init(void) 2729 { 2730 int err; 2731 2732 BUILD_BUG_ON(sizeof(struct mpls_shim_hdr) != 4); 2733 2734 err = register_pernet_subsys(&mpls_net_ops); 2735 if (err) 2736 goto out; 2737 2738 err = register_netdevice_notifier(&mpls_dev_notifier); 2739 if (err) 2740 goto out_unregister_pernet; 2741 2742 dev_add_pack(&mpls_packet_type); 2743 2744 rtnl_af_register(&mpls_af_ops); 2745 2746 rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_NEWROUTE, 2747 mpls_rtm_newroute, NULL, 0); 2748 rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_DELROUTE, 2749 mpls_rtm_delroute, NULL, 0); 2750 rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_GETROUTE, 2751 mpls_getroute, mpls_dump_routes, 0); 2752 rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_GETNETCONF, 2753 mpls_netconf_get_devconf, 2754 mpls_netconf_dump_devconf, 0); 2755 err = ipgre_tunnel_encap_add_mpls_ops(); 2756 if (err) 2757 pr_err("Can't add mpls over gre tunnel ops\n"); 2758 2759 err = 0; 2760 out: 2761 return err; 2762 2763 out_unregister_pernet: 2764 unregister_pernet_subsys(&mpls_net_ops); 2765 goto out; 2766 } 2767 module_init(mpls_init); 2768 2769 static void __exit mpls_exit(void) 2770 { 2771 rtnl_unregister_all(PF_MPLS); 2772 rtnl_af_unregister(&mpls_af_ops); 2773 dev_remove_pack(&mpls_packet_type); 2774 unregister_netdevice_notifier(&mpls_dev_notifier); 2775 unregister_pernet_subsys(&mpls_net_ops); 2776 ipgre_tunnel_encap_del_mpls_ops(); 2777 } 2778 module_exit(mpls_exit); 2779 2780 MODULE_DESCRIPTION("MultiProtocol Label Switching"); 2781 MODULE_LICENSE("GPL v2"); 2782 MODULE_ALIAS_NETPROTO(PF_MPLS); 2783