1 // SPDX-License-Identifier: GPL-2.0-only 2 #include <linux/types.h> 3 #include <linux/skbuff.h> 4 #include <linux/socket.h> 5 #include <linux/sysctl.h> 6 #include <linux/net.h> 7 #include <linux/module.h> 8 #include <linux/if_arp.h> 9 #include <linux/ipv6.h> 10 #include <linux/mpls.h> 11 #include <linux/netconf.h> 12 #include <linux/nospec.h> 13 #include <linux/vmalloc.h> 14 #include <linux/percpu.h> 15 #include <net/gso.h> 16 #include <net/ip.h> 17 #include <net/dst.h> 18 #include <net/sock.h> 19 #include <net/arp.h> 20 #include <net/ip_fib.h> 21 #include <net/netevent.h> 22 #include <net/ip_tunnels.h> 23 #include <net/netns/generic.h> 24 #if IS_ENABLED(CONFIG_IPV6) 25 #include <net/ipv6.h> 26 #endif 27 #include <net/rtnh.h> 28 #include "internal.h" 29 30 /* max memory we will use for mpls_route */ 31 #define MAX_MPLS_ROUTE_MEM 4096 32 33 /* Maximum number of labels to look ahead at when selecting a path of 34 * a multipath route 35 */ 36 #define MAX_MP_SELECT_LABELS 4 37 38 #define MPLS_NEIGH_TABLE_UNSPEC (NEIGH_LINK_TABLE + 1) 39 40 static int label_limit = (1 << 20) - 1; 41 static int ttl_max = 255; 42 43 #if IS_ENABLED(CONFIG_NET_IP_TUNNEL) 44 static size_t ipgre_mpls_encap_hlen(struct ip_tunnel_encap *e) 45 { 46 return sizeof(struct mpls_shim_hdr); 47 } 48 49 static const struct ip_tunnel_encap_ops mpls_iptun_ops = { 50 .encap_hlen = ipgre_mpls_encap_hlen, 51 }; 52 53 static int ipgre_tunnel_encap_add_mpls_ops(void) 54 { 55 return ip_tunnel_encap_add_ops(&mpls_iptun_ops, TUNNEL_ENCAP_MPLS); 56 } 57 58 static void ipgre_tunnel_encap_del_mpls_ops(void) 59 { 60 ip_tunnel_encap_del_ops(&mpls_iptun_ops, TUNNEL_ENCAP_MPLS); 61 } 62 #else 63 static int ipgre_tunnel_encap_add_mpls_ops(void) 64 { 65 return 0; 66 } 67 68 static void ipgre_tunnel_encap_del_mpls_ops(void) 69 { 70 } 71 #endif 72 73 static void rtmsg_lfib(int event, u32 label, struct mpls_route *rt, 74 struct nlmsghdr *nlh, struct net *net, u32 portid, 75 unsigned int nlm_flags); 76 77 static struct mpls_route *mpls_route_input(struct net *net, unsigned int index) 78 { 79 struct mpls_route __rcu **platform_label; 80 81 platform_label = mpls_dereference(net, net->mpls.platform_label); 82 return mpls_dereference(net, platform_label[index]); 83 } 84 85 static struct mpls_route __rcu **mpls_platform_label_rcu(struct net *net, size_t *platform_labels) 86 { 87 struct mpls_route __rcu **platform_label; 88 unsigned int sequence; 89 90 do { 91 sequence = read_seqcount_begin(&net->mpls.platform_label_seq); 92 platform_label = rcu_dereference(net->mpls.platform_label); 93 *platform_labels = net->mpls.platform_labels; 94 } while (read_seqcount_retry(&net->mpls.platform_label_seq, sequence)); 95 96 return platform_label; 97 } 98 99 static struct mpls_route *mpls_route_input_rcu(struct net *net, unsigned int index) 100 { 101 struct mpls_route __rcu **platform_label; 102 size_t platform_labels; 103 104 platform_label = mpls_platform_label_rcu(net, &platform_labels); 105 106 if (index >= platform_labels) 107 return NULL; 108 109 return rcu_dereference(platform_label[index]); 110 } 111 112 bool mpls_output_possible(const struct net_device *dev) 113 { 114 return dev && (dev->flags & IFF_UP) && netif_carrier_ok(dev); 115 } 116 EXPORT_SYMBOL_GPL(mpls_output_possible); 117 118 static u8 *__mpls_nh_via(struct mpls_route *rt, struct mpls_nh *nh) 119 { 120 return (u8 *)nh + rt->rt_via_offset; 121 } 122 123 static const u8 *mpls_nh_via(const struct mpls_route *rt, 124 const struct mpls_nh *nh) 125 { 126 return __mpls_nh_via((struct mpls_route *)rt, (struct mpls_nh *)nh); 127 } 128 129 static unsigned int mpls_nh_header_size(const struct mpls_nh *nh) 130 { 131 /* The size of the layer 2.5 labels to be added for this route */ 132 return nh->nh_labels * sizeof(struct mpls_shim_hdr); 133 } 134 135 unsigned int mpls_dev_mtu(const struct net_device *dev) 136 { 137 /* The amount of data the layer 2 frame can hold */ 138 return dev->mtu; 139 } 140 EXPORT_SYMBOL_GPL(mpls_dev_mtu); 141 142 bool mpls_pkt_too_big(const struct sk_buff *skb, unsigned int mtu) 143 { 144 if (skb->len <= mtu) 145 return false; 146 147 if (skb_is_gso(skb) && skb_gso_validate_network_len(skb, mtu)) 148 return false; 149 150 return true; 151 } 152 EXPORT_SYMBOL_GPL(mpls_pkt_too_big); 153 154 void mpls_stats_inc_outucastpkts(struct net *net, 155 struct net_device *dev, 156 const struct sk_buff *skb) 157 { 158 struct mpls_dev *mdev; 159 160 if (skb->protocol == htons(ETH_P_MPLS_UC)) { 161 mdev = mpls_dev_rcu(dev); 162 if (mdev) 163 MPLS_INC_STATS_LEN(mdev, skb->len, 164 tx_packets, 165 tx_bytes); 166 } else if (skb->protocol == htons(ETH_P_IP)) { 167 IP_UPD_PO_STATS(net, IPSTATS_MIB_OUT, skb->len); 168 #if IS_ENABLED(CONFIG_IPV6) 169 } else if (skb->protocol == htons(ETH_P_IPV6)) { 170 struct inet6_dev *in6dev = in6_dev_rcu(dev); 171 172 if (in6dev) 173 IP6_UPD_PO_STATS(net, in6dev, 174 IPSTATS_MIB_OUT, skb->len); 175 #endif 176 } 177 } 178 EXPORT_SYMBOL_GPL(mpls_stats_inc_outucastpkts); 179 180 static u32 mpls_multipath_hash(struct mpls_route *rt, struct sk_buff *skb) 181 { 182 struct mpls_entry_decoded dec; 183 unsigned int mpls_hdr_len = 0; 184 struct mpls_shim_hdr *hdr; 185 bool eli_seen = false; 186 int label_index; 187 u32 hash = 0; 188 189 for (label_index = 0; label_index < MAX_MP_SELECT_LABELS; 190 label_index++) { 191 mpls_hdr_len += sizeof(*hdr); 192 if (!pskb_may_pull(skb, mpls_hdr_len)) 193 break; 194 195 /* Read and decode the current label */ 196 hdr = mpls_hdr(skb) + label_index; 197 dec = mpls_entry_decode(hdr); 198 199 /* RFC6790 - reserved labels MUST NOT be used as keys 200 * for the load-balancing function 201 */ 202 if (likely(dec.label >= MPLS_LABEL_FIRST_UNRESERVED)) { 203 hash = jhash_1word(dec.label, hash); 204 205 /* The entropy label follows the entropy label 206 * indicator, so this means that the entropy 207 * label was just added to the hash - no need to 208 * go any deeper either in the label stack or in the 209 * payload 210 */ 211 if (eli_seen) 212 break; 213 } else if (dec.label == MPLS_LABEL_ENTROPY) { 214 eli_seen = true; 215 } 216 217 if (!dec.bos) 218 continue; 219 220 /* found bottom label; does skb have room for a header? */ 221 if (pskb_may_pull(skb, mpls_hdr_len + sizeof(struct iphdr))) { 222 const struct iphdr *v4hdr; 223 224 v4hdr = (const struct iphdr *)(hdr + 1); 225 if (v4hdr->version == 4) { 226 hash = jhash_3words(ntohl(v4hdr->saddr), 227 ntohl(v4hdr->daddr), 228 v4hdr->protocol, hash); 229 } else if (v4hdr->version == 6 && 230 pskb_may_pull(skb, mpls_hdr_len + 231 sizeof(struct ipv6hdr))) { 232 const struct ipv6hdr *v6hdr; 233 234 v6hdr = (const struct ipv6hdr *)(hdr + 1); 235 hash = __ipv6_addr_jhash(&v6hdr->saddr, hash); 236 hash = __ipv6_addr_jhash(&v6hdr->daddr, hash); 237 hash = jhash_1word(v6hdr->nexthdr, hash); 238 } 239 } 240 241 break; 242 } 243 244 return hash; 245 } 246 247 static struct mpls_nh *mpls_get_nexthop(struct mpls_route *rt, u8 index) 248 { 249 return (struct mpls_nh *)((u8 *)rt->rt_nh + index * rt->rt_nh_size); 250 } 251 252 /* number of alive nexthops (rt->rt_nhn_alive) and the flags for 253 * a next hop (nh->nh_flags) are modified by netdev event handlers. 254 * Since those fields can change at any moment, use READ_ONCE to 255 * access both. 256 */ 257 static const struct mpls_nh *mpls_select_multipath(struct mpls_route *rt, 258 struct sk_buff *skb) 259 { 260 u32 hash = 0; 261 int nh_index = 0; 262 int n = 0; 263 u8 alive; 264 265 /* No need to look further into packet if there's only 266 * one path 267 */ 268 if (rt->rt_nhn == 1) 269 return rt->rt_nh; 270 271 alive = READ_ONCE(rt->rt_nhn_alive); 272 if (alive == 0) 273 return NULL; 274 275 hash = mpls_multipath_hash(rt, skb); 276 nh_index = hash % alive; 277 if (alive == rt->rt_nhn) 278 goto out; 279 for_nexthops(rt) { 280 unsigned int nh_flags = READ_ONCE(nh->nh_flags); 281 282 if (nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)) 283 continue; 284 if (n == nh_index) 285 return nh; 286 n++; 287 } endfor_nexthops(rt); 288 289 out: 290 return mpls_get_nexthop(rt, nh_index); 291 } 292 293 static bool mpls_egress(struct net *net, struct mpls_route *rt, 294 struct sk_buff *skb, struct mpls_entry_decoded dec) 295 { 296 enum mpls_payload_type payload_type; 297 bool success = false; 298 299 /* The IPv4 code below accesses through the IPv4 header 300 * checksum, which is 12 bytes into the packet. 301 * The IPv6 code below accesses through the IPv6 hop limit 302 * which is 8 bytes into the packet. 303 * 304 * For all supported cases there should always be at least 12 305 * bytes of packet data present. The IPv4 header is 20 bytes 306 * without options and the IPv6 header is always 40 bytes 307 * long. 308 */ 309 if (!pskb_may_pull(skb, 12)) 310 return false; 311 312 payload_type = rt->rt_payload_type; 313 if (payload_type == MPT_UNSPEC) 314 payload_type = ip_hdr(skb)->version; 315 316 switch (payload_type) { 317 case MPT_IPV4: { 318 struct iphdr *hdr4 = ip_hdr(skb); 319 u8 new_ttl; 320 skb->protocol = htons(ETH_P_IP); 321 322 /* If propagating TTL, take the decremented TTL from 323 * the incoming MPLS header, otherwise decrement the 324 * TTL, 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 new_ttl = dec.ttl; 330 else 331 new_ttl = hdr4->ttl ? hdr4->ttl - 1 : 0; 332 333 csum_replace2(&hdr4->check, 334 htons(hdr4->ttl << 8), 335 htons(new_ttl << 8)); 336 hdr4->ttl = new_ttl; 337 success = true; 338 break; 339 } 340 case MPT_IPV6: { 341 struct ipv6hdr *hdr6 = ipv6_hdr(skb); 342 skb->protocol = htons(ETH_P_IPV6); 343 344 /* If propagating TTL, take the decremented TTL from 345 * the incoming MPLS header, otherwise decrement the 346 * hop limit, but only if not 0 to avoid underflow. 347 */ 348 if (rt->rt_ttl_propagate == MPLS_TTL_PROP_ENABLED || 349 (rt->rt_ttl_propagate == MPLS_TTL_PROP_DEFAULT && 350 net->mpls.ip_ttl_propagate)) 351 hdr6->hop_limit = dec.ttl; 352 else if (hdr6->hop_limit) 353 hdr6->hop_limit = hdr6->hop_limit - 1; 354 success = true; 355 break; 356 } 357 case MPT_UNSPEC: 358 /* Should have decided which protocol it is by now */ 359 break; 360 } 361 362 return success; 363 } 364 365 static int mpls_forward(struct sk_buff *skb, struct net_device *dev, 366 struct packet_type *pt, struct net_device *orig_dev) 367 { 368 struct net *net = dev_net_rcu(dev); 369 struct mpls_shim_hdr *hdr; 370 const struct mpls_nh *nh; 371 struct mpls_route *rt; 372 struct mpls_entry_decoded dec; 373 struct net_device *out_dev; 374 struct mpls_dev *out_mdev; 375 struct mpls_dev *mdev; 376 unsigned int hh_len; 377 unsigned int new_header_size; 378 unsigned int mtu; 379 int err; 380 381 /* Careful this entire function runs inside of an rcu critical section */ 382 383 mdev = mpls_dev_rcu(dev); 384 if (!mdev) 385 goto drop; 386 387 MPLS_INC_STATS_LEN(mdev, skb->len, rx_packets, 388 rx_bytes); 389 390 if (!mdev->input_enabled) { 391 MPLS_INC_STATS(mdev, rx_dropped); 392 goto drop; 393 } 394 395 if (skb->pkt_type != PACKET_HOST) 396 goto err; 397 398 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) 399 goto err; 400 401 if (!pskb_may_pull(skb, sizeof(*hdr))) 402 goto err; 403 404 skb_dst_drop(skb); 405 406 /* Read and decode the label */ 407 hdr = mpls_hdr(skb); 408 dec = mpls_entry_decode(hdr); 409 410 rt = mpls_route_input_rcu(net, dec.label); 411 if (!rt) { 412 MPLS_INC_STATS(mdev, rx_noroute); 413 goto drop; 414 } 415 416 nh = mpls_select_multipath(rt, skb); 417 if (!nh) 418 goto err; 419 420 /* Pop the label */ 421 skb_pull(skb, sizeof(*hdr)); 422 skb_reset_network_header(skb); 423 424 skb_orphan(skb); 425 426 if (skb_warn_if_lro(skb)) 427 goto err; 428 429 skb_forward_csum(skb); 430 431 /* Verify ttl is valid */ 432 if (dec.ttl <= 1) 433 goto err; 434 435 /* Find the output device */ 436 out_dev = nh->nh_dev; 437 if (!mpls_output_possible(out_dev)) 438 goto tx_err; 439 440 /* Verify the destination can hold the packet */ 441 new_header_size = mpls_nh_header_size(nh); 442 mtu = mpls_dev_mtu(out_dev); 443 if (mpls_pkt_too_big(skb, mtu - new_header_size)) 444 goto tx_err; 445 446 hh_len = LL_RESERVED_SPACE(out_dev); 447 if (!out_dev->header_ops) 448 hh_len = 0; 449 450 /* Ensure there is enough space for the headers in the skb */ 451 if (skb_cow(skb, hh_len + new_header_size)) 452 goto tx_err; 453 454 skb->dev = out_dev; 455 skb->protocol = htons(ETH_P_MPLS_UC); 456 457 dec.ttl -= 1; 458 if (unlikely(!new_header_size && dec.bos)) { 459 /* Penultimate hop popping */ 460 if (!mpls_egress(net, rt, skb, dec)) 461 goto err; 462 } else { 463 bool bos; 464 int i; 465 skb_push(skb, new_header_size); 466 skb_reset_network_header(skb); 467 /* Push the new labels */ 468 hdr = mpls_hdr(skb); 469 bos = dec.bos; 470 for (i = nh->nh_labels - 1; i >= 0; i--) { 471 hdr[i] = mpls_entry_encode(nh->nh_label[i], 472 dec.ttl, 0, bos); 473 bos = false; 474 } 475 } 476 477 mpls_stats_inc_outucastpkts(net, out_dev, skb); 478 479 /* If via wasn't specified then send out using device address */ 480 if (nh->nh_via_table == MPLS_NEIGH_TABLE_UNSPEC) 481 err = neigh_xmit(NEIGH_LINK_TABLE, out_dev, 482 out_dev->dev_addr, skb); 483 else 484 err = neigh_xmit(nh->nh_via_table, out_dev, 485 mpls_nh_via(rt, nh), skb); 486 if (err) 487 net_dbg_ratelimited("%s: packet transmission failed: %d\n", 488 __func__, err); 489 return 0; 490 491 tx_err: 492 out_mdev = out_dev ? mpls_dev_rcu(out_dev) : NULL; 493 if (out_mdev) 494 MPLS_INC_STATS(out_mdev, tx_errors); 495 goto drop; 496 err: 497 MPLS_INC_STATS(mdev, rx_errors); 498 drop: 499 kfree_skb(skb); 500 return NET_RX_DROP; 501 } 502 503 static struct packet_type mpls_packet_type __read_mostly = { 504 .type = cpu_to_be16(ETH_P_MPLS_UC), 505 .func = mpls_forward, 506 }; 507 508 static const struct nla_policy rtm_mpls_policy[RTA_MAX+1] = { 509 [RTA_DST] = { .type = NLA_U32 }, 510 [RTA_OIF] = { .type = NLA_U32 }, 511 [RTA_TTL_PROPAGATE] = { .type = NLA_U8 }, 512 }; 513 514 struct mpls_route_config { 515 u32 rc_protocol; 516 u32 rc_ifindex; 517 u8 rc_via_table; 518 u8 rc_via_alen; 519 u8 rc_via[MAX_VIA_ALEN]; 520 u32 rc_label; 521 u8 rc_ttl_propagate; 522 u8 rc_output_labels; 523 u32 rc_output_label[MAX_NEW_LABELS]; 524 u32 rc_nlflags; 525 enum mpls_payload_type rc_payload_type; 526 struct nl_info rc_nlinfo; 527 struct rtnexthop *rc_mp; 528 int rc_mp_len; 529 }; 530 531 /* all nexthops within a route have the same size based on max 532 * number of labels and max via length for a hop 533 */ 534 static struct mpls_route *mpls_rt_alloc(u8 num_nh, u8 max_alen, u8 max_labels) 535 { 536 u8 nh_size = MPLS_NH_SIZE(max_labels, max_alen); 537 struct mpls_route *rt; 538 size_t size; 539 540 size = sizeof(*rt) + num_nh * nh_size; 541 if (size > MAX_MPLS_ROUTE_MEM) 542 return ERR_PTR(-EINVAL); 543 544 rt = kzalloc(size, GFP_KERNEL); 545 if (!rt) 546 return ERR_PTR(-ENOMEM); 547 548 rt->rt_nhn = num_nh; 549 rt->rt_nhn_alive = num_nh; 550 rt->rt_nh_size = nh_size; 551 rt->rt_via_offset = MPLS_NH_VIA_OFF(max_labels); 552 553 return rt; 554 } 555 556 static void mpls_rt_free_rcu(struct rcu_head *head) 557 { 558 struct mpls_route *rt; 559 560 rt = container_of(head, struct mpls_route, rt_rcu); 561 562 change_nexthops(rt) { 563 netdev_put(nh->nh_dev, &nh->nh_dev_tracker); 564 } endfor_nexthops(rt); 565 566 kfree(rt); 567 } 568 569 static void mpls_rt_free(struct mpls_route *rt) 570 { 571 if (rt) 572 call_rcu(&rt->rt_rcu, mpls_rt_free_rcu); 573 } 574 575 static void mpls_notify_route(struct net *net, unsigned index, 576 struct mpls_route *old, struct mpls_route *new, 577 const struct nl_info *info) 578 { 579 struct nlmsghdr *nlh = info ? info->nlh : NULL; 580 unsigned portid = info ? info->portid : 0; 581 int event = new ? RTM_NEWROUTE : RTM_DELROUTE; 582 struct mpls_route *rt = new ? new : old; 583 unsigned nlm_flags = (old && new) ? NLM_F_REPLACE : 0; 584 /* Ignore reserved labels for now */ 585 if (rt && (index >= MPLS_LABEL_FIRST_UNRESERVED)) 586 rtmsg_lfib(event, index, rt, nlh, net, portid, nlm_flags); 587 } 588 589 static void mpls_route_update(struct net *net, unsigned index, 590 struct mpls_route *new, 591 const struct nl_info *info) 592 { 593 struct mpls_route __rcu **platform_label; 594 struct mpls_route *rt; 595 596 platform_label = mpls_dereference(net, net->mpls.platform_label); 597 rt = mpls_dereference(net, platform_label[index]); 598 rcu_assign_pointer(platform_label[index], new); 599 600 mpls_notify_route(net, index, rt, new, info); 601 602 /* If we removed a route free it now */ 603 mpls_rt_free(rt); 604 } 605 606 static unsigned int find_free_label(struct net *net) 607 { 608 unsigned int index; 609 610 for (index = MPLS_LABEL_FIRST_UNRESERVED; 611 index < net->mpls.platform_labels; 612 index++) { 613 if (!mpls_route_input(net, index)) 614 return index; 615 } 616 617 return LABEL_NOT_SPECIFIED; 618 } 619 620 #if IS_ENABLED(CONFIG_INET) 621 static struct net_device *inet_fib_lookup_dev(struct net *net, 622 struct mpls_nh *nh, 623 const void *addr) 624 { 625 struct net_device *dev; 626 struct rtable *rt; 627 struct in_addr daddr; 628 629 memcpy(&daddr, addr, sizeof(struct in_addr)); 630 rt = ip_route_output(net, daddr.s_addr, 0, 0, 0, RT_SCOPE_UNIVERSE); 631 if (IS_ERR(rt)) 632 return ERR_CAST(rt); 633 634 dev = rt->dst.dev; 635 netdev_hold(dev, &nh->nh_dev_tracker, GFP_KERNEL); 636 ip_rt_put(rt); 637 638 return dev; 639 } 640 #else 641 static struct net_device *inet_fib_lookup_dev(struct net *net, 642 struct mpls_nh *nh, 643 const void *addr) 644 { 645 return ERR_PTR(-EAFNOSUPPORT); 646 } 647 #endif 648 649 #if IS_ENABLED(CONFIG_IPV6) 650 static struct net_device *inet6_fib_lookup_dev(struct net *net, 651 struct mpls_nh *nh, 652 const void *addr) 653 { 654 struct net_device *dev; 655 struct dst_entry *dst; 656 struct flowi6 fl6; 657 658 memset(&fl6, 0, sizeof(fl6)); 659 memcpy(&fl6.daddr, addr, sizeof(struct in6_addr)); 660 dst = ip6_dst_lookup_flow(net, NULL, &fl6, NULL); 661 if (IS_ERR(dst)) 662 return ERR_CAST(dst); 663 664 dev = dst->dev; 665 netdev_hold(dev, &nh->nh_dev_tracker, GFP_KERNEL); 666 dst_release(dst); 667 668 return dev; 669 } 670 #else 671 static struct net_device *inet6_fib_lookup_dev(struct net *net, 672 struct mpls_nh *nh, 673 const void *addr) 674 { 675 return ERR_PTR(-EAFNOSUPPORT); 676 } 677 #endif 678 679 static struct net_device *find_outdev(struct net *net, 680 struct mpls_route *rt, 681 struct mpls_nh *nh, int oif) 682 { 683 struct net_device *dev = NULL; 684 685 if (!oif) { 686 switch (nh->nh_via_table) { 687 case NEIGH_ARP_TABLE: 688 dev = inet_fib_lookup_dev(net, nh, mpls_nh_via(rt, nh)); 689 break; 690 case NEIGH_ND_TABLE: 691 dev = inet6_fib_lookup_dev(net, nh, mpls_nh_via(rt, nh)); 692 break; 693 case NEIGH_LINK_TABLE: 694 break; 695 } 696 } else { 697 dev = netdev_get_by_index(net, oif, 698 &nh->nh_dev_tracker, GFP_KERNEL); 699 } 700 701 if (!dev) 702 return ERR_PTR(-ENODEV); 703 704 if (IS_ERR(dev)) 705 return dev; 706 707 nh->nh_dev = dev; 708 709 return dev; 710 } 711 712 static int mpls_nh_assign_dev(struct net *net, struct mpls_route *rt, 713 struct mpls_nh *nh, int oif) 714 { 715 struct net_device *dev = NULL; 716 int err = -ENODEV; 717 718 dev = find_outdev(net, rt, nh, oif); 719 if (IS_ERR(dev)) { 720 err = PTR_ERR(dev); 721 goto errout; 722 } 723 724 /* Ensure this is a supported device */ 725 err = -EINVAL; 726 if (!mpls_dev_get(net, dev)) 727 goto errout_put; 728 729 if ((nh->nh_via_table == NEIGH_LINK_TABLE) && 730 (dev->addr_len != nh->nh_via_alen)) 731 goto errout_put; 732 733 if (!(dev->flags & IFF_UP)) { 734 nh->nh_flags |= RTNH_F_DEAD; 735 } else { 736 unsigned int flags; 737 738 flags = netif_get_flags(dev); 739 if (!(flags & (IFF_RUNNING | IFF_LOWER_UP))) 740 nh->nh_flags |= RTNH_F_LINKDOWN; 741 } 742 743 return 0; 744 745 errout_put: 746 netdev_put(nh->nh_dev, &nh->nh_dev_tracker); 747 nh->nh_dev = NULL; 748 errout: 749 return err; 750 } 751 752 static int nla_get_via(const struct nlattr *nla, u8 *via_alen, u8 *via_table, 753 u8 via_addr[], struct netlink_ext_ack *extack) 754 { 755 struct rtvia *via = nla_data(nla); 756 int err = -EINVAL; 757 int alen; 758 759 if (nla_len(nla) < offsetof(struct rtvia, rtvia_addr)) { 760 NL_SET_ERR_MSG_ATTR(extack, nla, 761 "Invalid attribute length for RTA_VIA"); 762 goto errout; 763 } 764 alen = nla_len(nla) - 765 offsetof(struct rtvia, rtvia_addr); 766 if (alen > MAX_VIA_ALEN) { 767 NL_SET_ERR_MSG_ATTR(extack, nla, 768 "Invalid address length for RTA_VIA"); 769 goto errout; 770 } 771 772 /* Validate the address family */ 773 switch (via->rtvia_family) { 774 case AF_PACKET: 775 *via_table = NEIGH_LINK_TABLE; 776 break; 777 case AF_INET: 778 *via_table = NEIGH_ARP_TABLE; 779 if (alen != 4) 780 goto errout; 781 break; 782 case AF_INET6: 783 *via_table = NEIGH_ND_TABLE; 784 if (alen != 16) 785 goto errout; 786 break; 787 default: 788 /* Unsupported address family */ 789 goto errout; 790 } 791 792 memcpy(via_addr, via->rtvia_addr, alen); 793 *via_alen = alen; 794 err = 0; 795 796 errout: 797 return err; 798 } 799 800 static int mpls_nh_build_from_cfg(struct mpls_route_config *cfg, 801 struct mpls_route *rt) 802 { 803 struct net *net = cfg->rc_nlinfo.nl_net; 804 struct mpls_nh *nh = rt->rt_nh; 805 int err; 806 int i; 807 808 if (!nh) 809 return -ENOMEM; 810 811 nh->nh_labels = cfg->rc_output_labels; 812 for (i = 0; i < nh->nh_labels; i++) 813 nh->nh_label[i] = cfg->rc_output_label[i]; 814 815 nh->nh_via_table = cfg->rc_via_table; 816 memcpy(__mpls_nh_via(rt, nh), cfg->rc_via, cfg->rc_via_alen); 817 nh->nh_via_alen = cfg->rc_via_alen; 818 819 err = mpls_nh_assign_dev(net, rt, nh, cfg->rc_ifindex); 820 if (err) 821 goto errout; 822 823 if (nh->nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)) 824 rt->rt_nhn_alive--; 825 826 return 0; 827 828 errout: 829 return err; 830 } 831 832 static int mpls_nh_build(struct net *net, struct mpls_route *rt, 833 struct mpls_nh *nh, int oif, struct nlattr *via, 834 struct nlattr *newdst, u8 max_labels, 835 struct netlink_ext_ack *extack) 836 { 837 int err = -ENOMEM; 838 839 if (!nh) 840 goto errout; 841 842 if (newdst) { 843 err = nla_get_labels(newdst, max_labels, &nh->nh_labels, 844 nh->nh_label, extack); 845 if (err) 846 goto errout; 847 } 848 849 if (via) { 850 err = nla_get_via(via, &nh->nh_via_alen, &nh->nh_via_table, 851 __mpls_nh_via(rt, nh), extack); 852 if (err) 853 goto errout; 854 } else { 855 nh->nh_via_table = MPLS_NEIGH_TABLE_UNSPEC; 856 } 857 858 err = mpls_nh_assign_dev(net, rt, nh, oif); 859 if (err) 860 goto errout; 861 862 return 0; 863 864 errout: 865 return err; 866 } 867 868 static u8 mpls_count_nexthops(struct rtnexthop *rtnh, int len, 869 u8 cfg_via_alen, u8 *max_via_alen, 870 u8 *max_labels) 871 { 872 int remaining = len; 873 u8 nhs = 0; 874 875 *max_via_alen = 0; 876 *max_labels = 0; 877 878 while (rtnh_ok(rtnh, remaining)) { 879 struct nlattr *nla, *attrs = rtnh_attrs(rtnh); 880 int attrlen; 881 u8 n_labels = 0; 882 883 attrlen = rtnh_attrlen(rtnh); 884 nla = nla_find(attrs, attrlen, RTA_VIA); 885 if (nla && nla_len(nla) >= 886 offsetof(struct rtvia, rtvia_addr)) { 887 int via_alen = nla_len(nla) - 888 offsetof(struct rtvia, rtvia_addr); 889 890 if (via_alen <= MAX_VIA_ALEN) 891 *max_via_alen = max_t(u16, *max_via_alen, 892 via_alen); 893 } 894 895 nla = nla_find(attrs, attrlen, RTA_NEWDST); 896 if (nla && 897 nla_get_labels(nla, MAX_NEW_LABELS, &n_labels, 898 NULL, NULL) != 0) 899 return 0; 900 901 *max_labels = max_t(u8, *max_labels, n_labels); 902 903 /* number of nexthops is tracked by a u8. 904 * Check for overflow. 905 */ 906 if (nhs == 255) 907 return 0; 908 nhs++; 909 910 rtnh = rtnh_next(rtnh, &remaining); 911 } 912 913 /* leftover implies invalid nexthop configuration, discard it */ 914 return remaining > 0 ? 0 : nhs; 915 } 916 917 static int mpls_nh_build_multi(struct mpls_route_config *cfg, 918 struct mpls_route *rt, u8 max_labels, 919 struct netlink_ext_ack *extack) 920 { 921 struct rtnexthop *rtnh = cfg->rc_mp; 922 struct nlattr *nla_via, *nla_newdst; 923 int remaining = cfg->rc_mp_len; 924 int err = 0; 925 926 rt->rt_nhn = 0; 927 928 change_nexthops(rt) { 929 int attrlen; 930 931 nla_via = NULL; 932 nla_newdst = NULL; 933 934 err = -EINVAL; 935 if (!rtnh_ok(rtnh, remaining)) 936 goto errout; 937 938 /* neither weighted multipath nor any flags 939 * are supported 940 */ 941 if (rtnh->rtnh_hops || rtnh->rtnh_flags) 942 goto errout; 943 944 attrlen = rtnh_attrlen(rtnh); 945 if (attrlen > 0) { 946 struct nlattr *attrs = rtnh_attrs(rtnh); 947 948 nla_via = nla_find(attrs, attrlen, RTA_VIA); 949 nla_newdst = nla_find(attrs, attrlen, RTA_NEWDST); 950 } 951 952 err = mpls_nh_build(cfg->rc_nlinfo.nl_net, rt, nh, 953 rtnh->rtnh_ifindex, nla_via, nla_newdst, 954 max_labels, extack); 955 if (err) 956 goto errout; 957 958 if (nh->nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)) 959 rt->rt_nhn_alive--; 960 961 rtnh = rtnh_next(rtnh, &remaining); 962 rt->rt_nhn++; 963 } endfor_nexthops(rt); 964 965 return 0; 966 967 errout: 968 return err; 969 } 970 971 static bool mpls_label_ok(struct net *net, unsigned int *index, 972 struct netlink_ext_ack *extack) 973 { 974 /* Reserved labels may not be set */ 975 if (*index < MPLS_LABEL_FIRST_UNRESERVED) { 976 NL_SET_ERR_MSG(extack, 977 "Invalid label - must be MPLS_LABEL_FIRST_UNRESERVED or higher"); 978 return false; 979 } 980 981 /* The full 20 bit range may not be supported. */ 982 if (*index >= net->mpls.platform_labels) { 983 NL_SET_ERR_MSG(extack, 984 "Label >= configured maximum in platform_labels"); 985 return false; 986 } 987 988 *index = array_index_nospec(*index, net->mpls.platform_labels); 989 990 return true; 991 } 992 993 static int mpls_route_add(struct mpls_route_config *cfg, 994 struct netlink_ext_ack *extack) 995 { 996 struct net *net = cfg->rc_nlinfo.nl_net; 997 struct mpls_route *rt, *old; 998 int err = -EINVAL; 999 u8 max_via_alen; 1000 unsigned index; 1001 u8 max_labels; 1002 u8 nhs; 1003 1004 index = cfg->rc_label; 1005 1006 /* If a label was not specified during insert pick one */ 1007 if ((index == LABEL_NOT_SPECIFIED) && 1008 (cfg->rc_nlflags & NLM_F_CREATE)) { 1009 index = find_free_label(net); 1010 } 1011 1012 if (!mpls_label_ok(net, &index, extack)) 1013 goto errout; 1014 1015 /* Append makes no sense with mpls */ 1016 err = -EOPNOTSUPP; 1017 if (cfg->rc_nlflags & NLM_F_APPEND) { 1018 NL_SET_ERR_MSG(extack, "MPLS does not support route append"); 1019 goto errout; 1020 } 1021 1022 err = -EEXIST; 1023 old = mpls_route_input(net, index); 1024 if ((cfg->rc_nlflags & NLM_F_EXCL) && old) 1025 goto errout; 1026 1027 err = -EEXIST; 1028 if (!(cfg->rc_nlflags & NLM_F_REPLACE) && old) 1029 goto errout; 1030 1031 err = -ENOENT; 1032 if (!(cfg->rc_nlflags & NLM_F_CREATE) && !old) 1033 goto errout; 1034 1035 err = -EINVAL; 1036 if (cfg->rc_mp) { 1037 nhs = mpls_count_nexthops(cfg->rc_mp, cfg->rc_mp_len, 1038 cfg->rc_via_alen, &max_via_alen, 1039 &max_labels); 1040 } else { 1041 max_via_alen = cfg->rc_via_alen; 1042 max_labels = cfg->rc_output_labels; 1043 nhs = 1; 1044 } 1045 1046 if (nhs == 0) { 1047 NL_SET_ERR_MSG(extack, "Route does not contain a nexthop"); 1048 goto errout; 1049 } 1050 1051 rt = mpls_rt_alloc(nhs, max_via_alen, max_labels); 1052 if (IS_ERR(rt)) { 1053 err = PTR_ERR(rt); 1054 goto errout; 1055 } 1056 1057 rt->rt_protocol = cfg->rc_protocol; 1058 rt->rt_payload_type = cfg->rc_payload_type; 1059 rt->rt_ttl_propagate = cfg->rc_ttl_propagate; 1060 1061 if (cfg->rc_mp) 1062 err = mpls_nh_build_multi(cfg, rt, max_labels, extack); 1063 else 1064 err = mpls_nh_build_from_cfg(cfg, rt); 1065 if (err) 1066 goto freert; 1067 1068 mpls_route_update(net, index, rt, &cfg->rc_nlinfo); 1069 1070 return 0; 1071 1072 freert: 1073 mpls_rt_free(rt); 1074 errout: 1075 return err; 1076 } 1077 1078 static int mpls_route_del(struct mpls_route_config *cfg, 1079 struct netlink_ext_ack *extack) 1080 { 1081 struct net *net = cfg->rc_nlinfo.nl_net; 1082 unsigned index; 1083 int err = -EINVAL; 1084 1085 index = cfg->rc_label; 1086 1087 if (!mpls_label_ok(net, &index, extack)) 1088 goto errout; 1089 1090 mpls_route_update(net, index, NULL, &cfg->rc_nlinfo); 1091 1092 err = 0; 1093 errout: 1094 return err; 1095 } 1096 1097 static void mpls_get_stats(struct mpls_dev *mdev, 1098 struct mpls_link_stats *stats) 1099 { 1100 struct mpls_pcpu_stats *p; 1101 int i; 1102 1103 memset(stats, 0, sizeof(*stats)); 1104 1105 for_each_possible_cpu(i) { 1106 struct mpls_link_stats local; 1107 unsigned int start; 1108 1109 p = per_cpu_ptr(mdev->stats, i); 1110 do { 1111 start = u64_stats_fetch_begin(&p->syncp); 1112 local = p->stats; 1113 } while (u64_stats_fetch_retry(&p->syncp, start)); 1114 1115 stats->rx_packets += local.rx_packets; 1116 stats->rx_bytes += local.rx_bytes; 1117 stats->tx_packets += local.tx_packets; 1118 stats->tx_bytes += local.tx_bytes; 1119 stats->rx_errors += local.rx_errors; 1120 stats->tx_errors += local.tx_errors; 1121 stats->rx_dropped += local.rx_dropped; 1122 stats->tx_dropped += local.tx_dropped; 1123 stats->rx_noroute += local.rx_noroute; 1124 } 1125 } 1126 1127 static int mpls_fill_stats_af(struct sk_buff *skb, 1128 const struct net_device *dev) 1129 { 1130 struct mpls_link_stats *stats; 1131 struct mpls_dev *mdev; 1132 struct nlattr *nla; 1133 1134 mdev = mpls_dev_rcu(dev); 1135 if (!mdev) 1136 return -ENODATA; 1137 1138 nla = nla_reserve_64bit(skb, MPLS_STATS_LINK, 1139 sizeof(struct mpls_link_stats), 1140 MPLS_STATS_UNSPEC); 1141 if (!nla) 1142 return -EMSGSIZE; 1143 1144 stats = nla_data(nla); 1145 mpls_get_stats(mdev, stats); 1146 1147 return 0; 1148 } 1149 1150 static size_t mpls_get_stats_af_size(const struct net_device *dev) 1151 { 1152 struct mpls_dev *mdev; 1153 1154 mdev = mpls_dev_rcu(dev); 1155 if (!mdev) 1156 return 0; 1157 1158 return nla_total_size_64bit(sizeof(struct mpls_link_stats)); 1159 } 1160 1161 static int mpls_netconf_fill_devconf(struct sk_buff *skb, struct mpls_dev *mdev, 1162 u32 portid, u32 seq, int event, 1163 unsigned int flags, int type) 1164 { 1165 struct nlmsghdr *nlh; 1166 struct netconfmsg *ncm; 1167 bool all = false; 1168 1169 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 1170 flags); 1171 if (!nlh) 1172 return -EMSGSIZE; 1173 1174 if (type == NETCONFA_ALL) 1175 all = true; 1176 1177 ncm = nlmsg_data(nlh); 1178 ncm->ncm_family = AF_MPLS; 1179 1180 if (nla_put_s32(skb, NETCONFA_IFINDEX, mdev->dev->ifindex) < 0) 1181 goto nla_put_failure; 1182 1183 if ((all || type == NETCONFA_INPUT) && 1184 nla_put_s32(skb, NETCONFA_INPUT, 1185 READ_ONCE(mdev->input_enabled)) < 0) 1186 goto nla_put_failure; 1187 1188 nlmsg_end(skb, nlh); 1189 return 0; 1190 1191 nla_put_failure: 1192 nlmsg_cancel(skb, nlh); 1193 return -EMSGSIZE; 1194 } 1195 1196 static int mpls_netconf_msgsize_devconf(int type) 1197 { 1198 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 1199 + nla_total_size(4); /* NETCONFA_IFINDEX */ 1200 bool all = false; 1201 1202 if (type == NETCONFA_ALL) 1203 all = true; 1204 1205 if (all || type == NETCONFA_INPUT) 1206 size += nla_total_size(4); 1207 1208 return size; 1209 } 1210 1211 static void mpls_netconf_notify_devconf(struct net *net, int event, 1212 int type, struct mpls_dev *mdev) 1213 { 1214 struct sk_buff *skb; 1215 int err = -ENOBUFS; 1216 1217 skb = nlmsg_new(mpls_netconf_msgsize_devconf(type), GFP_KERNEL); 1218 if (!skb) 1219 goto errout; 1220 1221 err = mpls_netconf_fill_devconf(skb, mdev, 0, 0, event, 0, type); 1222 if (err < 0) { 1223 /* -EMSGSIZE implies BUG in mpls_netconf_msgsize_devconf() */ 1224 WARN_ON(err == -EMSGSIZE); 1225 kfree_skb(skb); 1226 goto errout; 1227 } 1228 1229 rtnl_notify(skb, net, 0, RTNLGRP_MPLS_NETCONF, NULL, GFP_KERNEL); 1230 return; 1231 errout: 1232 rtnl_set_sk_err(net, RTNLGRP_MPLS_NETCONF, err); 1233 } 1234 1235 static const struct nla_policy devconf_mpls_policy[NETCONFA_MAX + 1] = { 1236 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 1237 }; 1238 1239 static int mpls_netconf_valid_get_req(struct sk_buff *skb, 1240 const struct nlmsghdr *nlh, 1241 struct nlattr **tb, 1242 struct netlink_ext_ack *extack) 1243 { 1244 int i, err; 1245 1246 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) { 1247 NL_SET_ERR_MSG_MOD(extack, 1248 "Invalid header for netconf get request"); 1249 return -EINVAL; 1250 } 1251 1252 if (!netlink_strict_get_check(skb)) 1253 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg), 1254 tb, NETCONFA_MAX, 1255 devconf_mpls_policy, extack); 1256 1257 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg), 1258 tb, NETCONFA_MAX, 1259 devconf_mpls_policy, extack); 1260 if (err) 1261 return err; 1262 1263 for (i = 0; i <= NETCONFA_MAX; i++) { 1264 if (!tb[i]) 1265 continue; 1266 1267 switch (i) { 1268 case NETCONFA_IFINDEX: 1269 break; 1270 default: 1271 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request"); 1272 return -EINVAL; 1273 } 1274 } 1275 1276 return 0; 1277 } 1278 1279 static int mpls_netconf_get_devconf(struct sk_buff *in_skb, 1280 struct nlmsghdr *nlh, 1281 struct netlink_ext_ack *extack) 1282 { 1283 struct net *net = sock_net(in_skb->sk); 1284 struct nlattr *tb[NETCONFA_MAX + 1]; 1285 struct net_device *dev; 1286 struct mpls_dev *mdev; 1287 struct sk_buff *skb; 1288 int ifindex; 1289 int err; 1290 1291 err = mpls_netconf_valid_get_req(in_skb, nlh, tb, extack); 1292 if (err < 0) 1293 goto errout; 1294 1295 if (!tb[NETCONFA_IFINDEX]) { 1296 err = -EINVAL; 1297 goto errout; 1298 } 1299 1300 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 1301 1302 skb = nlmsg_new(mpls_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL); 1303 if (!skb) { 1304 err = -ENOBUFS; 1305 goto errout; 1306 } 1307 1308 rcu_read_lock(); 1309 1310 dev = dev_get_by_index_rcu(net, ifindex); 1311 if (!dev) { 1312 err = -EINVAL; 1313 goto errout_unlock; 1314 } 1315 1316 mdev = mpls_dev_rcu(dev); 1317 if (!mdev) { 1318 err = -EINVAL; 1319 goto errout_unlock; 1320 } 1321 1322 err = mpls_netconf_fill_devconf(skb, mdev, 1323 NETLINK_CB(in_skb).portid, 1324 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 1325 NETCONFA_ALL); 1326 if (err < 0) { 1327 /* -EMSGSIZE implies BUG in mpls_netconf_msgsize_devconf() */ 1328 WARN_ON(err == -EMSGSIZE); 1329 goto errout_unlock; 1330 } 1331 1332 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 1333 1334 rcu_read_unlock(); 1335 errout: 1336 return err; 1337 1338 errout_unlock: 1339 rcu_read_unlock(); 1340 kfree_skb(skb); 1341 goto errout; 1342 } 1343 1344 static int mpls_netconf_dump_devconf(struct sk_buff *skb, 1345 struct netlink_callback *cb) 1346 { 1347 const struct nlmsghdr *nlh = cb->nlh; 1348 struct net *net = sock_net(skb->sk); 1349 struct { 1350 unsigned long ifindex; 1351 } *ctx = (void *)cb->ctx; 1352 struct net_device *dev; 1353 struct mpls_dev *mdev; 1354 int err = 0; 1355 1356 if (cb->strict_check) { 1357 struct netlink_ext_ack *extack = cb->extack; 1358 struct netconfmsg *ncm; 1359 1360 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) { 1361 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request"); 1362 return -EINVAL; 1363 } 1364 1365 if (nlmsg_attrlen(nlh, sizeof(*ncm))) { 1366 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request"); 1367 return -EINVAL; 1368 } 1369 } 1370 1371 rcu_read_lock(); 1372 for_each_netdev_dump(net, dev, ctx->ifindex) { 1373 mdev = mpls_dev_rcu(dev); 1374 if (!mdev) 1375 continue; 1376 err = mpls_netconf_fill_devconf(skb, mdev, 1377 NETLINK_CB(cb->skb).portid, 1378 nlh->nlmsg_seq, 1379 RTM_NEWNETCONF, 1380 NLM_F_MULTI, 1381 NETCONFA_ALL); 1382 if (err < 0) 1383 break; 1384 } 1385 rcu_read_unlock(); 1386 1387 return err; 1388 } 1389 1390 #define MPLS_PERDEV_SYSCTL_OFFSET(field) \ 1391 (&((struct mpls_dev *)0)->field) 1392 1393 static int mpls_conf_proc(const struct ctl_table *ctl, int write, 1394 void *buffer, size_t *lenp, loff_t *ppos) 1395 { 1396 int oval = *(int *)ctl->data; 1397 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 1398 1399 if (write) { 1400 struct mpls_dev *mdev = ctl->extra1; 1401 int i = (int *)ctl->data - (int *)mdev; 1402 struct net *net = ctl->extra2; 1403 int val = *(int *)ctl->data; 1404 1405 if (i == offsetof(struct mpls_dev, input_enabled) && 1406 val != oval) { 1407 mpls_netconf_notify_devconf(net, RTM_NEWNETCONF, 1408 NETCONFA_INPUT, mdev); 1409 } 1410 } 1411 1412 return ret; 1413 } 1414 1415 static const struct ctl_table mpls_dev_table[] = { 1416 { 1417 .procname = "input", 1418 .maxlen = sizeof(int), 1419 .mode = 0644, 1420 .proc_handler = mpls_conf_proc, 1421 .data = MPLS_PERDEV_SYSCTL_OFFSET(input_enabled), 1422 }, 1423 }; 1424 1425 static int mpls_dev_sysctl_register(struct net_device *dev, 1426 struct mpls_dev *mdev) 1427 { 1428 char path[sizeof("net/mpls/conf/") + IFNAMSIZ]; 1429 size_t table_size = ARRAY_SIZE(mpls_dev_table); 1430 struct net *net = dev_net(dev); 1431 struct ctl_table *table; 1432 int i; 1433 1434 table = kmemdup(&mpls_dev_table, sizeof(mpls_dev_table), GFP_KERNEL); 1435 if (!table) 1436 goto out; 1437 1438 /* Table data contains only offsets relative to the base of 1439 * the mdev at this point, so make them absolute. 1440 */ 1441 for (i = 0; i < table_size; i++) { 1442 table[i].data = (char *)mdev + (uintptr_t)table[i].data; 1443 table[i].extra1 = mdev; 1444 table[i].extra2 = net; 1445 } 1446 1447 snprintf(path, sizeof(path), "net/mpls/conf/%s", dev->name); 1448 1449 mdev->sysctl = register_net_sysctl_sz(net, path, table, table_size); 1450 if (!mdev->sysctl) 1451 goto free; 1452 1453 mpls_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, mdev); 1454 return 0; 1455 1456 free: 1457 kfree(table); 1458 out: 1459 mdev->sysctl = NULL; 1460 return -ENOBUFS; 1461 } 1462 1463 static void mpls_dev_sysctl_unregister(struct net_device *dev, 1464 struct mpls_dev *mdev) 1465 { 1466 struct net *net = dev_net(dev); 1467 const struct ctl_table *table; 1468 1469 if (!mdev->sysctl) 1470 return; 1471 1472 table = mdev->sysctl->ctl_table_arg; 1473 unregister_net_sysctl_table(mdev->sysctl); 1474 kfree(table); 1475 1476 mpls_netconf_notify_devconf(net, RTM_DELNETCONF, 0, mdev); 1477 } 1478 1479 static struct mpls_dev *mpls_add_dev(struct net_device *dev) 1480 { 1481 struct mpls_dev *mdev; 1482 int err = -ENOMEM; 1483 int i; 1484 1485 mdev = kzalloc_obj(*mdev); 1486 if (!mdev) 1487 return ERR_PTR(err); 1488 1489 mdev->stats = alloc_percpu(struct mpls_pcpu_stats); 1490 if (!mdev->stats) 1491 goto free; 1492 1493 for_each_possible_cpu(i) { 1494 struct mpls_pcpu_stats *mpls_stats; 1495 1496 mpls_stats = per_cpu_ptr(mdev->stats, i); 1497 u64_stats_init(&mpls_stats->syncp); 1498 } 1499 1500 mdev->dev = dev; 1501 1502 err = mpls_dev_sysctl_register(dev, mdev); 1503 if (err) 1504 goto free; 1505 1506 rcu_assign_pointer(dev->mpls_ptr, mdev); 1507 1508 return mdev; 1509 1510 free: 1511 free_percpu(mdev->stats); 1512 kfree(mdev); 1513 return ERR_PTR(err); 1514 } 1515 1516 static void mpls_dev_destroy_rcu(struct rcu_head *head) 1517 { 1518 struct mpls_dev *mdev = container_of(head, struct mpls_dev, rcu); 1519 1520 free_percpu(mdev->stats); 1521 kfree(mdev); 1522 } 1523 1524 static int mpls_ifdown(struct net_device *dev, int event) 1525 { 1526 struct net *net = dev_net(dev); 1527 unsigned int index; 1528 1529 for (index = 0; index < net->mpls.platform_labels; index++) { 1530 struct mpls_route *rt; 1531 bool nh_del = false; 1532 u8 alive = 0; 1533 1534 rt = mpls_route_input(net, index); 1535 if (!rt) 1536 continue; 1537 1538 if (event == NETDEV_UNREGISTER) { 1539 u8 deleted = 0; 1540 1541 for_nexthops(rt) { 1542 if (!nh->nh_dev || nh->nh_dev == dev) 1543 deleted++; 1544 if (nh->nh_dev == dev) 1545 nh_del = true; 1546 } endfor_nexthops(rt); 1547 1548 /* if there are no more nexthops, delete the route */ 1549 if (deleted == rt->rt_nhn) { 1550 mpls_route_update(net, index, NULL, NULL); 1551 continue; 1552 } 1553 1554 if (nh_del) { 1555 size_t size = sizeof(*rt) + rt->rt_nhn * 1556 rt->rt_nh_size; 1557 struct mpls_route *orig = rt; 1558 1559 rt = kmemdup(orig, size, GFP_KERNEL); 1560 if (!rt) 1561 return -ENOMEM; 1562 } 1563 } 1564 1565 change_nexthops(rt) { 1566 unsigned int nh_flags = nh->nh_flags; 1567 1568 if (nh->nh_dev != dev) { 1569 if (nh_del) 1570 netdev_hold(nh->nh_dev, &nh->nh_dev_tracker, 1571 GFP_KERNEL); 1572 goto next; 1573 } 1574 1575 switch (event) { 1576 case NETDEV_DOWN: 1577 case NETDEV_UNREGISTER: 1578 nh_flags |= RTNH_F_DEAD; 1579 fallthrough; 1580 case NETDEV_CHANGE: 1581 nh_flags |= RTNH_F_LINKDOWN; 1582 break; 1583 } 1584 if (event == NETDEV_UNREGISTER) 1585 nh->nh_dev = NULL; 1586 1587 if (nh->nh_flags != nh_flags) 1588 WRITE_ONCE(nh->nh_flags, nh_flags); 1589 next: 1590 if (!(nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN))) 1591 alive++; 1592 } endfor_nexthops(rt); 1593 1594 WRITE_ONCE(rt->rt_nhn_alive, alive); 1595 1596 if (nh_del) 1597 mpls_route_update(net, index, rt, NULL); 1598 } 1599 1600 return 0; 1601 } 1602 1603 static void mpls_ifup(struct net_device *dev, unsigned int flags) 1604 { 1605 struct net *net = dev_net(dev); 1606 unsigned int index; 1607 u8 alive; 1608 1609 for (index = 0; index < net->mpls.platform_labels; index++) { 1610 struct mpls_route *rt; 1611 1612 rt = mpls_route_input(net, index); 1613 if (!rt) 1614 continue; 1615 1616 alive = 0; 1617 change_nexthops(rt) { 1618 unsigned int nh_flags = nh->nh_flags; 1619 1620 if (!(nh_flags & flags)) { 1621 alive++; 1622 continue; 1623 } 1624 if (nh->nh_dev != dev) 1625 continue; 1626 alive++; 1627 nh_flags &= ~flags; 1628 WRITE_ONCE(nh->nh_flags, nh_flags); 1629 } endfor_nexthops(rt); 1630 1631 WRITE_ONCE(rt->rt_nhn_alive, alive); 1632 } 1633 } 1634 1635 static int mpls_dev_notify(struct notifier_block *this, unsigned long event, 1636 void *ptr) 1637 { 1638 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1639 struct net *net = dev_net(dev); 1640 struct mpls_dev *mdev; 1641 unsigned int flags; 1642 int err; 1643 1644 mutex_lock(&net->mpls.platform_mutex); 1645 1646 if (event == NETDEV_REGISTER) { 1647 mdev = mpls_add_dev(dev); 1648 if (IS_ERR(mdev)) { 1649 err = PTR_ERR(mdev); 1650 goto err; 1651 } 1652 1653 goto out; 1654 } 1655 1656 mdev = mpls_dev_get(net, dev); 1657 if (!mdev) 1658 goto out; 1659 1660 switch (event) { 1661 1662 case NETDEV_DOWN: 1663 err = mpls_ifdown(dev, event); 1664 if (err) 1665 goto err; 1666 break; 1667 case NETDEV_UP: 1668 flags = netif_get_flags(dev); 1669 if (flags & (IFF_RUNNING | IFF_LOWER_UP)) 1670 mpls_ifup(dev, RTNH_F_DEAD | RTNH_F_LINKDOWN); 1671 else 1672 mpls_ifup(dev, RTNH_F_DEAD); 1673 break; 1674 case NETDEV_CHANGE: 1675 flags = netif_get_flags(dev); 1676 if (flags & (IFF_RUNNING | IFF_LOWER_UP)) { 1677 mpls_ifup(dev, RTNH_F_DEAD | RTNH_F_LINKDOWN); 1678 } else { 1679 err = mpls_ifdown(dev, event); 1680 if (err) 1681 goto err; 1682 } 1683 break; 1684 case NETDEV_UNREGISTER: 1685 err = mpls_ifdown(dev, event); 1686 if (err) 1687 goto err; 1688 1689 mdev = mpls_dev_get(net, dev); 1690 if (mdev) { 1691 mpls_dev_sysctl_unregister(dev, mdev); 1692 RCU_INIT_POINTER(dev->mpls_ptr, NULL); 1693 call_rcu(&mdev->rcu, mpls_dev_destroy_rcu); 1694 } 1695 break; 1696 case NETDEV_CHANGENAME: 1697 mdev = mpls_dev_get(net, dev); 1698 if (mdev) { 1699 mpls_dev_sysctl_unregister(dev, mdev); 1700 err = mpls_dev_sysctl_register(dev, mdev); 1701 if (err) 1702 goto err; 1703 } 1704 break; 1705 } 1706 1707 out: 1708 mutex_unlock(&net->mpls.platform_mutex); 1709 return NOTIFY_OK; 1710 1711 err: 1712 mutex_unlock(&net->mpls.platform_mutex); 1713 return notifier_from_errno(err); 1714 } 1715 1716 static struct notifier_block mpls_dev_notifier = { 1717 .notifier_call = mpls_dev_notify, 1718 }; 1719 1720 static int nla_put_via(struct sk_buff *skb, 1721 u8 table, const void *addr, int alen) 1722 { 1723 static const int table_to_family[NEIGH_NR_TABLES + 1] = { 1724 AF_INET, AF_INET6, AF_PACKET, 1725 }; 1726 struct nlattr *nla; 1727 struct rtvia *via; 1728 int family = AF_UNSPEC; 1729 1730 nla = nla_reserve(skb, RTA_VIA, alen + 2); 1731 if (!nla) 1732 return -EMSGSIZE; 1733 1734 if (table <= NEIGH_NR_TABLES) 1735 family = table_to_family[table]; 1736 1737 via = nla_data(nla); 1738 via->rtvia_family = family; 1739 memcpy(via->rtvia_addr, addr, alen); 1740 return 0; 1741 } 1742 1743 int nla_put_labels(struct sk_buff *skb, int attrtype, 1744 u8 labels, const u32 label[]) 1745 { 1746 struct nlattr *nla; 1747 struct mpls_shim_hdr *nla_label; 1748 bool bos; 1749 int i; 1750 nla = nla_reserve(skb, attrtype, labels*4); 1751 if (!nla) 1752 return -EMSGSIZE; 1753 1754 nla_label = nla_data(nla); 1755 bos = true; 1756 for (i = labels - 1; i >= 0; i--) { 1757 nla_label[i] = mpls_entry_encode(label[i], 0, 0, bos); 1758 bos = false; 1759 } 1760 1761 return 0; 1762 } 1763 EXPORT_SYMBOL_GPL(nla_put_labels); 1764 1765 int nla_get_labels(const struct nlattr *nla, u8 max_labels, u8 *labels, 1766 u32 label[], struct netlink_ext_ack *extack) 1767 { 1768 unsigned len = nla_len(nla); 1769 struct mpls_shim_hdr *nla_label; 1770 u8 nla_labels; 1771 bool bos; 1772 int i; 1773 1774 /* len needs to be an even multiple of 4 (the label size). Number 1775 * of labels is a u8 so check for overflow. 1776 */ 1777 if (len & 3 || len / 4 > 255) { 1778 NL_SET_ERR_MSG_ATTR(extack, nla, 1779 "Invalid length for labels attribute"); 1780 return -EINVAL; 1781 } 1782 1783 /* Limit the number of new labels allowed */ 1784 nla_labels = len/4; 1785 if (nla_labels > max_labels) { 1786 NL_SET_ERR_MSG(extack, "Too many labels"); 1787 return -EINVAL; 1788 } 1789 1790 /* when label == NULL, caller wants number of labels */ 1791 if (!label) 1792 goto out; 1793 1794 nla_label = nla_data(nla); 1795 bos = true; 1796 for (i = nla_labels - 1; i >= 0; i--, bos = false) { 1797 struct mpls_entry_decoded dec; 1798 dec = mpls_entry_decode(nla_label + i); 1799 1800 /* Ensure the bottom of stack flag is properly set 1801 * and ttl and tc are both clear. 1802 */ 1803 if (dec.ttl) { 1804 NL_SET_ERR_MSG_ATTR(extack, nla, 1805 "TTL in label must be 0"); 1806 return -EINVAL; 1807 } 1808 1809 if (dec.tc) { 1810 NL_SET_ERR_MSG_ATTR(extack, nla, 1811 "Traffic class in label must be 0"); 1812 return -EINVAL; 1813 } 1814 1815 if (dec.bos != bos) { 1816 NL_SET_BAD_ATTR(extack, nla); 1817 if (bos) { 1818 NL_SET_ERR_MSG(extack, 1819 "BOS bit must be set in first label"); 1820 } else { 1821 NL_SET_ERR_MSG(extack, 1822 "BOS bit can only be set in first label"); 1823 } 1824 return -EINVAL; 1825 } 1826 1827 switch (dec.label) { 1828 case MPLS_LABEL_IMPLNULL: 1829 /* RFC3032: This is a label that an LSR may 1830 * assign and distribute, but which never 1831 * actually appears in the encapsulation. 1832 */ 1833 NL_SET_ERR_MSG_ATTR(extack, nla, 1834 "Implicit NULL Label (3) can not be used in encapsulation"); 1835 return -EINVAL; 1836 } 1837 1838 label[i] = dec.label; 1839 } 1840 out: 1841 *labels = nla_labels; 1842 return 0; 1843 } 1844 EXPORT_SYMBOL_GPL(nla_get_labels); 1845 1846 static int rtm_to_route_config(struct sk_buff *skb, 1847 struct nlmsghdr *nlh, 1848 struct mpls_route_config *cfg, 1849 struct netlink_ext_ack *extack) 1850 { 1851 struct rtmsg *rtm; 1852 struct nlattr *tb[RTA_MAX+1]; 1853 int index; 1854 int err; 1855 1856 err = nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX, 1857 rtm_mpls_policy, extack); 1858 if (err < 0) 1859 goto errout; 1860 1861 err = -EINVAL; 1862 rtm = nlmsg_data(nlh); 1863 1864 if (rtm->rtm_family != AF_MPLS) { 1865 NL_SET_ERR_MSG(extack, "Invalid address family in rtmsg"); 1866 goto errout; 1867 } 1868 if (rtm->rtm_dst_len != 20) { 1869 NL_SET_ERR_MSG(extack, "rtm_dst_len must be 20 for MPLS"); 1870 goto errout; 1871 } 1872 if (rtm->rtm_src_len != 0) { 1873 NL_SET_ERR_MSG(extack, "rtm_src_len must be 0 for MPLS"); 1874 goto errout; 1875 } 1876 if (rtm->rtm_tos != 0) { 1877 NL_SET_ERR_MSG(extack, "rtm_tos must be 0 for MPLS"); 1878 goto errout; 1879 } 1880 if (rtm->rtm_table != RT_TABLE_MAIN) { 1881 NL_SET_ERR_MSG(extack, 1882 "MPLS only supports the main route table"); 1883 goto errout; 1884 } 1885 /* Any value is acceptable for rtm_protocol */ 1886 1887 /* As mpls uses destination specific addresses 1888 * (or source specific address in the case of multicast) 1889 * all addresses have universal scope. 1890 */ 1891 if (rtm->rtm_scope != RT_SCOPE_UNIVERSE) { 1892 NL_SET_ERR_MSG(extack, 1893 "Invalid route scope - MPLS only supports UNIVERSE"); 1894 goto errout; 1895 } 1896 if (rtm->rtm_type != RTN_UNICAST) { 1897 NL_SET_ERR_MSG(extack, 1898 "Invalid route type - MPLS only supports UNICAST"); 1899 goto errout; 1900 } 1901 if (rtm->rtm_flags != 0) { 1902 NL_SET_ERR_MSG(extack, "rtm_flags must be 0 for MPLS"); 1903 goto errout; 1904 } 1905 1906 cfg->rc_label = LABEL_NOT_SPECIFIED; 1907 cfg->rc_protocol = rtm->rtm_protocol; 1908 cfg->rc_via_table = MPLS_NEIGH_TABLE_UNSPEC; 1909 cfg->rc_ttl_propagate = MPLS_TTL_PROP_DEFAULT; 1910 cfg->rc_nlflags = nlh->nlmsg_flags; 1911 cfg->rc_nlinfo.portid = NETLINK_CB(skb).portid; 1912 cfg->rc_nlinfo.nlh = nlh; 1913 cfg->rc_nlinfo.nl_net = sock_net(skb->sk); 1914 1915 for (index = 0; index <= RTA_MAX; index++) { 1916 struct nlattr *nla = tb[index]; 1917 if (!nla) 1918 continue; 1919 1920 switch (index) { 1921 case RTA_OIF: 1922 cfg->rc_ifindex = nla_get_u32(nla); 1923 break; 1924 case RTA_NEWDST: 1925 if (nla_get_labels(nla, MAX_NEW_LABELS, 1926 &cfg->rc_output_labels, 1927 cfg->rc_output_label, extack)) 1928 goto errout; 1929 break; 1930 case RTA_DST: 1931 { 1932 u8 label_count; 1933 if (nla_get_labels(nla, 1, &label_count, 1934 &cfg->rc_label, extack)) 1935 goto errout; 1936 1937 if (!mpls_label_ok(cfg->rc_nlinfo.nl_net, 1938 &cfg->rc_label, extack)) 1939 goto errout; 1940 break; 1941 } 1942 case RTA_GATEWAY: 1943 NL_SET_ERR_MSG(extack, "MPLS does not support RTA_GATEWAY attribute"); 1944 goto errout; 1945 case RTA_VIA: 1946 { 1947 if (nla_get_via(nla, &cfg->rc_via_alen, 1948 &cfg->rc_via_table, cfg->rc_via, 1949 extack)) 1950 goto errout; 1951 break; 1952 } 1953 case RTA_MULTIPATH: 1954 { 1955 cfg->rc_mp = nla_data(nla); 1956 cfg->rc_mp_len = nla_len(nla); 1957 break; 1958 } 1959 case RTA_TTL_PROPAGATE: 1960 { 1961 u8 ttl_propagate = nla_get_u8(nla); 1962 1963 if (ttl_propagate > 1) { 1964 NL_SET_ERR_MSG_ATTR(extack, nla, 1965 "RTA_TTL_PROPAGATE can only be 0 or 1"); 1966 goto errout; 1967 } 1968 cfg->rc_ttl_propagate = ttl_propagate ? 1969 MPLS_TTL_PROP_ENABLED : 1970 MPLS_TTL_PROP_DISABLED; 1971 break; 1972 } 1973 default: 1974 NL_SET_ERR_MSG_ATTR(extack, nla, "Unknown attribute"); 1975 /* Unsupported attribute */ 1976 goto errout; 1977 } 1978 } 1979 1980 err = 0; 1981 errout: 1982 return err; 1983 } 1984 1985 static int mpls_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, 1986 struct netlink_ext_ack *extack) 1987 { 1988 struct net *net = sock_net(skb->sk); 1989 struct mpls_route_config *cfg; 1990 int err; 1991 1992 cfg = kzalloc_obj(*cfg); 1993 if (!cfg) 1994 return -ENOMEM; 1995 1996 err = rtm_to_route_config(skb, nlh, cfg, extack); 1997 if (err < 0) 1998 goto out; 1999 2000 mutex_lock(&net->mpls.platform_mutex); 2001 err = mpls_route_del(cfg, extack); 2002 mutex_unlock(&net->mpls.platform_mutex); 2003 out: 2004 kfree(cfg); 2005 2006 return err; 2007 } 2008 2009 2010 static int mpls_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, 2011 struct netlink_ext_ack *extack) 2012 { 2013 struct net *net = sock_net(skb->sk); 2014 struct mpls_route_config *cfg; 2015 int err; 2016 2017 cfg = kzalloc_obj(*cfg); 2018 if (!cfg) 2019 return -ENOMEM; 2020 2021 err = rtm_to_route_config(skb, nlh, cfg, extack); 2022 if (err < 0) 2023 goto out; 2024 2025 mutex_lock(&net->mpls.platform_mutex); 2026 err = mpls_route_add(cfg, extack); 2027 mutex_unlock(&net->mpls.platform_mutex); 2028 out: 2029 kfree(cfg); 2030 2031 return err; 2032 } 2033 2034 static int mpls_dump_route(struct sk_buff *skb, u32 portid, u32 seq, int event, 2035 u32 label, struct mpls_route *rt, int flags) 2036 { 2037 struct net_device *dev; 2038 struct nlmsghdr *nlh; 2039 struct rtmsg *rtm; 2040 2041 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*rtm), flags); 2042 if (nlh == NULL) 2043 return -EMSGSIZE; 2044 2045 rtm = nlmsg_data(nlh); 2046 rtm->rtm_family = AF_MPLS; 2047 rtm->rtm_dst_len = 20; 2048 rtm->rtm_src_len = 0; 2049 rtm->rtm_tos = 0; 2050 rtm->rtm_table = RT_TABLE_MAIN; 2051 rtm->rtm_protocol = rt->rt_protocol; 2052 rtm->rtm_scope = RT_SCOPE_UNIVERSE; 2053 rtm->rtm_type = RTN_UNICAST; 2054 rtm->rtm_flags = 0; 2055 2056 if (nla_put_labels(skb, RTA_DST, 1, &label)) 2057 goto nla_put_failure; 2058 2059 if (rt->rt_ttl_propagate != MPLS_TTL_PROP_DEFAULT) { 2060 bool ttl_propagate = 2061 rt->rt_ttl_propagate == MPLS_TTL_PROP_ENABLED; 2062 2063 if (nla_put_u8(skb, RTA_TTL_PROPAGATE, 2064 ttl_propagate)) 2065 goto nla_put_failure; 2066 } 2067 if (rt->rt_nhn == 1) { 2068 const struct mpls_nh *nh = rt->rt_nh; 2069 2070 if (nh->nh_labels && 2071 nla_put_labels(skb, RTA_NEWDST, nh->nh_labels, 2072 nh->nh_label)) 2073 goto nla_put_failure; 2074 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC && 2075 nla_put_via(skb, nh->nh_via_table, mpls_nh_via(rt, nh), 2076 nh->nh_via_alen)) 2077 goto nla_put_failure; 2078 dev = nh->nh_dev; 2079 if (dev && nla_put_u32(skb, RTA_OIF, dev->ifindex)) 2080 goto nla_put_failure; 2081 if (nh->nh_flags & RTNH_F_LINKDOWN) 2082 rtm->rtm_flags |= RTNH_F_LINKDOWN; 2083 if (nh->nh_flags & RTNH_F_DEAD) 2084 rtm->rtm_flags |= RTNH_F_DEAD; 2085 } else { 2086 struct rtnexthop *rtnh; 2087 struct nlattr *mp; 2088 u8 linkdown = 0; 2089 u8 dead = 0; 2090 2091 mp = nla_nest_start_noflag(skb, RTA_MULTIPATH); 2092 if (!mp) 2093 goto nla_put_failure; 2094 2095 for_nexthops(rt) { 2096 dev = nh->nh_dev; 2097 if (!dev) 2098 continue; 2099 2100 rtnh = nla_reserve_nohdr(skb, sizeof(*rtnh)); 2101 if (!rtnh) 2102 goto nla_put_failure; 2103 2104 rtnh->rtnh_ifindex = dev->ifindex; 2105 if (nh->nh_flags & RTNH_F_LINKDOWN) { 2106 rtnh->rtnh_flags |= RTNH_F_LINKDOWN; 2107 linkdown++; 2108 } 2109 if (nh->nh_flags & RTNH_F_DEAD) { 2110 rtnh->rtnh_flags |= RTNH_F_DEAD; 2111 dead++; 2112 } 2113 2114 if (nh->nh_labels && nla_put_labels(skb, RTA_NEWDST, 2115 nh->nh_labels, 2116 nh->nh_label)) 2117 goto nla_put_failure; 2118 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC && 2119 nla_put_via(skb, nh->nh_via_table, 2120 mpls_nh_via(rt, nh), 2121 nh->nh_via_alen)) 2122 goto nla_put_failure; 2123 2124 /* length of rtnetlink header + attributes */ 2125 rtnh->rtnh_len = nlmsg_get_pos(skb) - (void *)rtnh; 2126 } endfor_nexthops(rt); 2127 2128 if (linkdown == rt->rt_nhn) 2129 rtm->rtm_flags |= RTNH_F_LINKDOWN; 2130 if (dead == rt->rt_nhn) 2131 rtm->rtm_flags |= RTNH_F_DEAD; 2132 2133 nla_nest_end(skb, mp); 2134 } 2135 2136 nlmsg_end(skb, nlh); 2137 return 0; 2138 2139 nla_put_failure: 2140 nlmsg_cancel(skb, nlh); 2141 return -EMSGSIZE; 2142 } 2143 2144 #if IS_ENABLED(CONFIG_INET) 2145 static int mpls_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh, 2146 struct fib_dump_filter *filter, 2147 struct netlink_callback *cb) 2148 { 2149 return ip_valid_fib_dump_req(net, nlh, filter, cb); 2150 } 2151 #else 2152 static int mpls_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh, 2153 struct fib_dump_filter *filter, 2154 struct netlink_callback *cb) 2155 { 2156 struct netlink_ext_ack *extack = cb->extack; 2157 struct nlattr *tb[RTA_MAX + 1]; 2158 struct rtmsg *rtm; 2159 int err, i; 2160 2161 rtm = nlmsg_payload(nlh, sizeof(*rtm)); 2162 if (!rtm) { 2163 NL_SET_ERR_MSG_MOD(extack, "Invalid header for FIB dump request"); 2164 return -EINVAL; 2165 } 2166 2167 if (rtm->rtm_dst_len || rtm->rtm_src_len || rtm->rtm_tos || 2168 rtm->rtm_table || rtm->rtm_scope || rtm->rtm_type || 2169 rtm->rtm_flags) { 2170 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for FIB dump request"); 2171 return -EINVAL; 2172 } 2173 2174 if (rtm->rtm_protocol) { 2175 filter->protocol = rtm->rtm_protocol; 2176 filter->filter_set = 1; 2177 cb->answer_flags = NLM_F_DUMP_FILTERED; 2178 } 2179 2180 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX, 2181 rtm_mpls_policy, extack); 2182 if (err < 0) 2183 return err; 2184 2185 for (i = 0; i <= RTA_MAX; ++i) { 2186 int ifindex; 2187 2188 if (i == RTA_OIF) { 2189 ifindex = nla_get_u32(tb[i]); 2190 filter->dev = dev_get_by_index_rcu(net, ifindex); 2191 if (!filter->dev) 2192 return -ENODEV; 2193 filter->filter_set = 1; 2194 } else if (tb[i]) { 2195 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request"); 2196 return -EINVAL; 2197 } 2198 } 2199 2200 return 0; 2201 } 2202 #endif 2203 2204 static bool mpls_rt_uses_dev(struct mpls_route *rt, 2205 const struct net_device *dev) 2206 { 2207 if (rt->rt_nhn == 1) { 2208 struct mpls_nh *nh = rt->rt_nh; 2209 2210 if (nh->nh_dev == dev) 2211 return true; 2212 } else { 2213 for_nexthops(rt) { 2214 if (nh->nh_dev == dev) 2215 return true; 2216 } endfor_nexthops(rt); 2217 } 2218 2219 return false; 2220 } 2221 2222 static int mpls_dump_routes(struct sk_buff *skb, struct netlink_callback *cb) 2223 { 2224 const struct nlmsghdr *nlh = cb->nlh; 2225 struct net *net = sock_net(skb->sk); 2226 struct mpls_route __rcu **platform_label; 2227 struct fib_dump_filter filter = { 2228 .rtnl_held = false, 2229 }; 2230 unsigned int flags = NLM_F_MULTI; 2231 size_t platform_labels; 2232 unsigned int index; 2233 int err; 2234 2235 rcu_read_lock(); 2236 2237 if (cb->strict_check) { 2238 err = mpls_valid_fib_dump_req(net, nlh, &filter, cb); 2239 if (err < 0) 2240 goto err; 2241 2242 /* for MPLS, there is only 1 table with fixed type and flags. 2243 * If either are set in the filter then return nothing. 2244 */ 2245 if ((filter.table_id && filter.table_id != RT_TABLE_MAIN) || 2246 (filter.rt_type && filter.rt_type != RTN_UNICAST) || 2247 filter.flags) 2248 goto unlock; 2249 } 2250 2251 index = cb->args[0]; 2252 if (index < MPLS_LABEL_FIRST_UNRESERVED) 2253 index = MPLS_LABEL_FIRST_UNRESERVED; 2254 2255 platform_label = mpls_platform_label_rcu(net, &platform_labels); 2256 2257 if (filter.filter_set) 2258 flags |= NLM_F_DUMP_FILTERED; 2259 2260 for (; index < platform_labels; index++) { 2261 struct mpls_route *rt; 2262 2263 rt = rcu_dereference(platform_label[index]); 2264 if (!rt) 2265 continue; 2266 2267 if ((filter.dev && !mpls_rt_uses_dev(rt, filter.dev)) || 2268 (filter.protocol && rt->rt_protocol != filter.protocol)) 2269 continue; 2270 2271 if (mpls_dump_route(skb, NETLINK_CB(cb->skb).portid, 2272 cb->nlh->nlmsg_seq, RTM_NEWROUTE, 2273 index, rt, flags) < 0) 2274 break; 2275 } 2276 cb->args[0] = index; 2277 2278 unlock: 2279 rcu_read_unlock(); 2280 return skb->len; 2281 2282 err: 2283 rcu_read_unlock(); 2284 return err; 2285 } 2286 2287 static inline size_t lfib_nlmsg_size(struct mpls_route *rt) 2288 { 2289 size_t payload = 2290 NLMSG_ALIGN(sizeof(struct rtmsg)) 2291 + nla_total_size(4) /* RTA_DST */ 2292 + nla_total_size(1); /* RTA_TTL_PROPAGATE */ 2293 2294 if (rt->rt_nhn == 1) { 2295 struct mpls_nh *nh = rt->rt_nh; 2296 2297 if (nh->nh_dev) 2298 payload += nla_total_size(4); /* RTA_OIF */ 2299 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC) /* RTA_VIA */ 2300 payload += nla_total_size(2 + nh->nh_via_alen); 2301 if (nh->nh_labels) /* RTA_NEWDST */ 2302 payload += nla_total_size(nh->nh_labels * 4); 2303 } else { 2304 /* each nexthop is packed in an attribute */ 2305 size_t nhsize = 0; 2306 2307 for_nexthops(rt) { 2308 if (!nh->nh_dev) 2309 continue; 2310 nhsize += nla_total_size(sizeof(struct rtnexthop)); 2311 /* RTA_VIA */ 2312 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC) 2313 nhsize += nla_total_size(2 + nh->nh_via_alen); 2314 if (nh->nh_labels) 2315 nhsize += nla_total_size(nh->nh_labels * 4); 2316 } endfor_nexthops(rt); 2317 /* nested attribute */ 2318 payload += nla_total_size(nhsize); 2319 } 2320 2321 return payload; 2322 } 2323 2324 static void rtmsg_lfib(int event, u32 label, struct mpls_route *rt, 2325 struct nlmsghdr *nlh, struct net *net, u32 portid, 2326 unsigned int nlm_flags) 2327 { 2328 struct sk_buff *skb; 2329 u32 seq = nlh ? nlh->nlmsg_seq : 0; 2330 int err = -ENOBUFS; 2331 2332 skb = nlmsg_new(lfib_nlmsg_size(rt), GFP_KERNEL); 2333 if (skb == NULL) 2334 goto errout; 2335 2336 err = mpls_dump_route(skb, portid, seq, event, label, rt, nlm_flags); 2337 if (err < 0) { 2338 /* -EMSGSIZE implies BUG in lfib_nlmsg_size */ 2339 WARN_ON(err == -EMSGSIZE); 2340 kfree_skb(skb); 2341 goto errout; 2342 } 2343 rtnl_notify(skb, net, portid, RTNLGRP_MPLS_ROUTE, nlh, GFP_KERNEL); 2344 2345 return; 2346 errout: 2347 rtnl_set_sk_err(net, RTNLGRP_MPLS_ROUTE, err); 2348 } 2349 2350 static int mpls_valid_getroute_req(struct sk_buff *skb, 2351 const struct nlmsghdr *nlh, 2352 struct nlattr **tb, 2353 struct netlink_ext_ack *extack) 2354 { 2355 struct rtmsg *rtm; 2356 int i, err; 2357 2358 rtm = nlmsg_payload(nlh, sizeof(*rtm)); 2359 if (!rtm) { 2360 NL_SET_ERR_MSG_MOD(extack, 2361 "Invalid header for get route request"); 2362 return -EINVAL; 2363 } 2364 2365 if (!netlink_strict_get_check(skb)) 2366 return nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX, 2367 rtm_mpls_policy, extack); 2368 2369 if ((rtm->rtm_dst_len && rtm->rtm_dst_len != 20) || 2370 rtm->rtm_src_len || rtm->rtm_tos || rtm->rtm_table || 2371 rtm->rtm_protocol || rtm->rtm_scope || rtm->rtm_type) { 2372 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get route request"); 2373 return -EINVAL; 2374 } 2375 if (rtm->rtm_flags & ~RTM_F_FIB_MATCH) { 2376 NL_SET_ERR_MSG_MOD(extack, 2377 "Invalid flags for get route request"); 2378 return -EINVAL; 2379 } 2380 2381 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX, 2382 rtm_mpls_policy, extack); 2383 if (err) 2384 return err; 2385 2386 if ((tb[RTA_DST] || tb[RTA_NEWDST]) && !rtm->rtm_dst_len) { 2387 NL_SET_ERR_MSG_MOD(extack, "rtm_dst_len must be 20 for MPLS"); 2388 return -EINVAL; 2389 } 2390 2391 for (i = 0; i <= RTA_MAX; i++) { 2392 if (!tb[i]) 2393 continue; 2394 2395 switch (i) { 2396 case RTA_DST: 2397 case RTA_NEWDST: 2398 break; 2399 default: 2400 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get route request"); 2401 return -EINVAL; 2402 } 2403 } 2404 2405 return 0; 2406 } 2407 2408 static int mpls_getroute(struct sk_buff *in_skb, struct nlmsghdr *in_nlh, 2409 struct netlink_ext_ack *extack) 2410 { 2411 struct net *net = sock_net(in_skb->sk); 2412 u32 portid = NETLINK_CB(in_skb).portid; 2413 u32 in_label = LABEL_NOT_SPECIFIED; 2414 struct nlattr *tb[RTA_MAX + 1]; 2415 struct mpls_route *rt = NULL; 2416 u32 labels[MAX_NEW_LABELS]; 2417 struct mpls_shim_hdr *hdr; 2418 unsigned int hdr_size = 0; 2419 const struct mpls_nh *nh; 2420 struct net_device *dev; 2421 struct rtmsg *rtm, *r; 2422 struct nlmsghdr *nlh; 2423 struct sk_buff *skb; 2424 u8 n_labels; 2425 int err; 2426 2427 mutex_lock(&net->mpls.platform_mutex); 2428 2429 err = mpls_valid_getroute_req(in_skb, in_nlh, tb, extack); 2430 if (err < 0) 2431 goto errout; 2432 2433 rtm = nlmsg_data(in_nlh); 2434 2435 if (tb[RTA_DST]) { 2436 u8 label_count; 2437 2438 if (nla_get_labels(tb[RTA_DST], 1, &label_count, 2439 &in_label, extack)) { 2440 err = -EINVAL; 2441 goto errout; 2442 } 2443 2444 if (!mpls_label_ok(net, &in_label, extack)) { 2445 err = -EINVAL; 2446 goto errout; 2447 } 2448 } 2449 2450 if (in_label < net->mpls.platform_labels) 2451 rt = mpls_route_input(net, in_label); 2452 if (!rt) { 2453 err = -ENETUNREACH; 2454 goto errout; 2455 } 2456 2457 if (rtm->rtm_flags & RTM_F_FIB_MATCH) { 2458 skb = nlmsg_new(lfib_nlmsg_size(rt), GFP_KERNEL); 2459 if (!skb) { 2460 err = -ENOBUFS; 2461 goto errout; 2462 } 2463 2464 err = mpls_dump_route(skb, portid, in_nlh->nlmsg_seq, 2465 RTM_NEWROUTE, in_label, rt, 0); 2466 if (err < 0) { 2467 /* -EMSGSIZE implies BUG in lfib_nlmsg_size */ 2468 WARN_ON(err == -EMSGSIZE); 2469 goto errout_free; 2470 } 2471 2472 err = rtnl_unicast(skb, net, portid); 2473 goto errout; 2474 } 2475 2476 if (tb[RTA_NEWDST]) { 2477 if (nla_get_labels(tb[RTA_NEWDST], MAX_NEW_LABELS, &n_labels, 2478 labels, extack) != 0) { 2479 err = -EINVAL; 2480 goto errout; 2481 } 2482 2483 hdr_size = n_labels * sizeof(struct mpls_shim_hdr); 2484 } 2485 2486 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); 2487 if (!skb) { 2488 err = -ENOBUFS; 2489 goto errout; 2490 } 2491 2492 skb->protocol = htons(ETH_P_MPLS_UC); 2493 2494 if (hdr_size) { 2495 bool bos; 2496 int i; 2497 2498 if (skb_cow(skb, hdr_size)) { 2499 err = -ENOBUFS; 2500 goto errout_free; 2501 } 2502 2503 skb_reserve(skb, hdr_size); 2504 skb_push(skb, hdr_size); 2505 skb_reset_network_header(skb); 2506 2507 /* Push new labels */ 2508 hdr = mpls_hdr(skb); 2509 bos = true; 2510 for (i = n_labels - 1; i >= 0; i--) { 2511 hdr[i] = mpls_entry_encode(labels[i], 2512 1, 0, bos); 2513 bos = false; 2514 } 2515 } 2516 2517 nh = mpls_select_multipath(rt, skb); 2518 if (!nh) { 2519 err = -ENETUNREACH; 2520 goto errout_free; 2521 } 2522 2523 if (hdr_size) { 2524 skb_pull(skb, hdr_size); 2525 skb_reset_network_header(skb); 2526 } 2527 2528 nlh = nlmsg_put(skb, portid, in_nlh->nlmsg_seq, 2529 RTM_NEWROUTE, sizeof(*r), 0); 2530 if (!nlh) { 2531 err = -EMSGSIZE; 2532 goto errout_free; 2533 } 2534 2535 r = nlmsg_data(nlh); 2536 r->rtm_family = AF_MPLS; 2537 r->rtm_dst_len = 20; 2538 r->rtm_src_len = 0; 2539 r->rtm_table = RT_TABLE_MAIN; 2540 r->rtm_type = RTN_UNICAST; 2541 r->rtm_scope = RT_SCOPE_UNIVERSE; 2542 r->rtm_protocol = rt->rt_protocol; 2543 r->rtm_flags = 0; 2544 2545 if (nla_put_labels(skb, RTA_DST, 1, &in_label)) 2546 goto nla_put_failure; 2547 2548 if (nh->nh_labels && 2549 nla_put_labels(skb, RTA_NEWDST, nh->nh_labels, 2550 nh->nh_label)) 2551 goto nla_put_failure; 2552 2553 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC && 2554 nla_put_via(skb, nh->nh_via_table, mpls_nh_via(rt, nh), 2555 nh->nh_via_alen)) 2556 goto nla_put_failure; 2557 dev = nh->nh_dev; 2558 if (dev && nla_put_u32(skb, RTA_OIF, dev->ifindex)) 2559 goto nla_put_failure; 2560 2561 nlmsg_end(skb, nlh); 2562 2563 err = rtnl_unicast(skb, net, portid); 2564 errout: 2565 mutex_unlock(&net->mpls.platform_mutex); 2566 return err; 2567 2568 nla_put_failure: 2569 nlmsg_cancel(skb, nlh); 2570 err = -EMSGSIZE; 2571 errout_free: 2572 mutex_unlock(&net->mpls.platform_mutex); 2573 kfree_skb(skb); 2574 return err; 2575 } 2576 2577 static int resize_platform_label_table(struct net *net, size_t limit) 2578 { 2579 size_t size = sizeof(struct mpls_route *) * limit; 2580 size_t old_limit; 2581 size_t cp_size; 2582 struct mpls_route __rcu **labels = NULL, **old; 2583 struct mpls_route *rt0 = NULL, *rt2 = NULL; 2584 unsigned index; 2585 2586 if (size) { 2587 labels = kvzalloc(size, GFP_KERNEL); 2588 if (!labels) 2589 goto nolabels; 2590 } 2591 2592 /* In case the predefined labels need to be populated */ 2593 if (limit > MPLS_LABEL_IPV4NULL) { 2594 struct net_device *lo = net->loopback_dev; 2595 2596 rt0 = mpls_rt_alloc(1, lo->addr_len, 0); 2597 if (IS_ERR(rt0)) 2598 goto nort0; 2599 2600 rt0->rt_nh->nh_dev = lo; 2601 netdev_hold(lo, &rt0->rt_nh->nh_dev_tracker, GFP_KERNEL); 2602 rt0->rt_protocol = RTPROT_KERNEL; 2603 rt0->rt_payload_type = MPT_IPV4; 2604 rt0->rt_ttl_propagate = MPLS_TTL_PROP_DEFAULT; 2605 rt0->rt_nh->nh_via_table = NEIGH_LINK_TABLE; 2606 rt0->rt_nh->nh_via_alen = lo->addr_len; 2607 memcpy(__mpls_nh_via(rt0, rt0->rt_nh), lo->dev_addr, 2608 lo->addr_len); 2609 } 2610 if (limit > MPLS_LABEL_IPV6NULL) { 2611 struct net_device *lo = net->loopback_dev; 2612 2613 rt2 = mpls_rt_alloc(1, lo->addr_len, 0); 2614 if (IS_ERR(rt2)) 2615 goto nort2; 2616 2617 rt2->rt_nh->nh_dev = lo; 2618 netdev_hold(lo, &rt2->rt_nh->nh_dev_tracker, GFP_KERNEL); 2619 rt2->rt_protocol = RTPROT_KERNEL; 2620 rt2->rt_payload_type = MPT_IPV6; 2621 rt2->rt_ttl_propagate = MPLS_TTL_PROP_DEFAULT; 2622 rt2->rt_nh->nh_via_table = NEIGH_LINK_TABLE; 2623 rt2->rt_nh->nh_via_alen = lo->addr_len; 2624 memcpy(__mpls_nh_via(rt2, rt2->rt_nh), lo->dev_addr, 2625 lo->addr_len); 2626 } 2627 2628 mutex_lock(&net->mpls.platform_mutex); 2629 2630 /* Remember the original table */ 2631 old = mpls_dereference(net, net->mpls.platform_label); 2632 old_limit = net->mpls.platform_labels; 2633 2634 /* Free any labels beyond the new table */ 2635 for (index = limit; index < old_limit; index++) 2636 mpls_route_update(net, index, NULL, NULL); 2637 2638 /* Copy over the old labels */ 2639 cp_size = size; 2640 if (old_limit < limit) 2641 cp_size = old_limit * sizeof(struct mpls_route *); 2642 2643 memcpy(labels, old, cp_size); 2644 2645 /* If needed set the predefined labels */ 2646 if ((old_limit <= MPLS_LABEL_IPV6NULL) && 2647 (limit > MPLS_LABEL_IPV6NULL)) { 2648 RCU_INIT_POINTER(labels[MPLS_LABEL_IPV6NULL], rt2); 2649 rt2 = NULL; 2650 } 2651 2652 if ((old_limit <= MPLS_LABEL_IPV4NULL) && 2653 (limit > MPLS_LABEL_IPV4NULL)) { 2654 RCU_INIT_POINTER(labels[MPLS_LABEL_IPV4NULL], rt0); 2655 rt0 = NULL; 2656 } 2657 2658 /* Update the global pointers */ 2659 local_bh_disable(); 2660 write_seqcount_begin(&net->mpls.platform_label_seq); 2661 net->mpls.platform_labels = limit; 2662 rcu_assign_pointer(net->mpls.platform_label, labels); 2663 write_seqcount_end(&net->mpls.platform_label_seq); 2664 local_bh_enable(); 2665 2666 mutex_unlock(&net->mpls.platform_mutex); 2667 2668 mpls_rt_free(rt2); 2669 mpls_rt_free(rt0); 2670 2671 if (old) { 2672 synchronize_rcu(); 2673 kvfree(old); 2674 } 2675 return 0; 2676 2677 nort2: 2678 mpls_rt_free(rt0); 2679 nort0: 2680 kvfree(labels); 2681 nolabels: 2682 return -ENOMEM; 2683 } 2684 2685 static int mpls_platform_labels(const struct ctl_table *table, int write, 2686 void *buffer, size_t *lenp, loff_t *ppos) 2687 { 2688 struct net *net = table->data; 2689 int platform_labels = net->mpls.platform_labels; 2690 int ret; 2691 struct ctl_table tmp = { 2692 .procname = table->procname, 2693 .data = &platform_labels, 2694 .maxlen = sizeof(int), 2695 .mode = table->mode, 2696 .extra1 = SYSCTL_ZERO, 2697 .extra2 = &label_limit, 2698 }; 2699 2700 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); 2701 2702 if (write && ret == 0) 2703 ret = resize_platform_label_table(net, platform_labels); 2704 2705 return ret; 2706 } 2707 2708 #define MPLS_NS_SYSCTL_OFFSET(field) \ 2709 (&((struct net *)0)->field) 2710 2711 static const struct ctl_table mpls_table[] = { 2712 { 2713 .procname = "platform_labels", 2714 .data = NULL, 2715 .maxlen = sizeof(int), 2716 .mode = 0644, 2717 .proc_handler = mpls_platform_labels, 2718 }, 2719 { 2720 .procname = "ip_ttl_propagate", 2721 .data = MPLS_NS_SYSCTL_OFFSET(mpls.ip_ttl_propagate), 2722 .maxlen = sizeof(int), 2723 .mode = 0644, 2724 .proc_handler = proc_dointvec_minmax, 2725 .extra1 = SYSCTL_ZERO, 2726 .extra2 = SYSCTL_ONE, 2727 }, 2728 { 2729 .procname = "default_ttl", 2730 .data = MPLS_NS_SYSCTL_OFFSET(mpls.default_ttl), 2731 .maxlen = sizeof(int), 2732 .mode = 0644, 2733 .proc_handler = proc_dointvec_minmax, 2734 .extra1 = SYSCTL_ONE, 2735 .extra2 = &ttl_max, 2736 }, 2737 }; 2738 2739 static __net_init int mpls_net_init(struct net *net) 2740 { 2741 size_t table_size = ARRAY_SIZE(mpls_table); 2742 struct ctl_table *table; 2743 int i; 2744 2745 mutex_init(&net->mpls.platform_mutex); 2746 seqcount_mutex_init(&net->mpls.platform_label_seq, &net->mpls.platform_mutex); 2747 2748 net->mpls.platform_labels = 0; 2749 net->mpls.platform_label = NULL; 2750 net->mpls.ip_ttl_propagate = 1; 2751 net->mpls.default_ttl = 255; 2752 2753 table = kmemdup(mpls_table, sizeof(mpls_table), GFP_KERNEL); 2754 if (table == NULL) 2755 return -ENOMEM; 2756 2757 /* Table data contains only offsets relative to the base of 2758 * the mdev at this point, so make them absolute. 2759 */ 2760 for (i = 0; i < table_size; i++) 2761 table[i].data = (char *)net + (uintptr_t)table[i].data; 2762 2763 net->mpls.ctl = register_net_sysctl_sz(net, "net/mpls", table, 2764 table_size); 2765 if (net->mpls.ctl == NULL) { 2766 kfree(table); 2767 return -ENOMEM; 2768 } 2769 2770 return 0; 2771 } 2772 2773 static __net_exit void mpls_net_exit(struct net *net) 2774 { 2775 struct mpls_route __rcu **platform_label; 2776 size_t platform_labels; 2777 const struct ctl_table *table; 2778 unsigned int index; 2779 2780 table = net->mpls.ctl->ctl_table_arg; 2781 unregister_net_sysctl_table(net->mpls.ctl); 2782 kfree(table); 2783 2784 /* An rcu grace period has passed since there was a device in 2785 * the network namespace (and thus the last in flight packet) 2786 * left this network namespace. This is because 2787 * unregister_netdevice_many and netdev_run_todo has completed 2788 * for each network device that was in this network namespace. 2789 * 2790 * As such no additional rcu synchronization is necessary when 2791 * freeing the platform_label table. 2792 */ 2793 mutex_lock(&net->mpls.platform_mutex); 2794 2795 platform_label = mpls_dereference(net, net->mpls.platform_label); 2796 platform_labels = net->mpls.platform_labels; 2797 2798 for (index = 0; index < platform_labels; index++) { 2799 struct mpls_route *rt; 2800 2801 rt = mpls_dereference(net, platform_label[index]); 2802 mpls_notify_route(net, index, rt, NULL, NULL); 2803 mpls_rt_free(rt); 2804 } 2805 2806 mutex_unlock(&net->mpls.platform_mutex); 2807 2808 kvfree(platform_label); 2809 } 2810 2811 static struct pernet_operations mpls_net_ops = { 2812 .init = mpls_net_init, 2813 .exit = mpls_net_exit, 2814 }; 2815 2816 static struct rtnl_af_ops mpls_af_ops __read_mostly = { 2817 .family = AF_MPLS, 2818 .fill_stats_af = mpls_fill_stats_af, 2819 .get_stats_af_size = mpls_get_stats_af_size, 2820 }; 2821 2822 static const struct rtnl_msg_handler mpls_rtnl_msg_handlers[] __initdata_or_module = { 2823 {THIS_MODULE, PF_MPLS, RTM_NEWROUTE, mpls_rtm_newroute, NULL, 2824 RTNL_FLAG_DOIT_UNLOCKED}, 2825 {THIS_MODULE, PF_MPLS, RTM_DELROUTE, mpls_rtm_delroute, NULL, 2826 RTNL_FLAG_DOIT_UNLOCKED}, 2827 {THIS_MODULE, PF_MPLS, RTM_GETROUTE, mpls_getroute, mpls_dump_routes, 2828 RTNL_FLAG_DOIT_UNLOCKED | RTNL_FLAG_DUMP_UNLOCKED}, 2829 {THIS_MODULE, PF_MPLS, RTM_GETNETCONF, 2830 mpls_netconf_get_devconf, mpls_netconf_dump_devconf, 2831 RTNL_FLAG_DOIT_UNLOCKED | RTNL_FLAG_DUMP_UNLOCKED}, 2832 }; 2833 2834 static int __init mpls_init(void) 2835 { 2836 int err; 2837 2838 BUILD_BUG_ON(sizeof(struct mpls_shim_hdr) != 4); 2839 2840 err = register_pernet_subsys(&mpls_net_ops); 2841 if (err) 2842 goto out; 2843 2844 err = register_netdevice_notifier(&mpls_dev_notifier); 2845 if (err) 2846 goto out_unregister_pernet; 2847 2848 dev_add_pack(&mpls_packet_type); 2849 2850 err = rtnl_af_register(&mpls_af_ops); 2851 if (err) 2852 goto out_unregister_dev_type; 2853 2854 err = rtnl_register_many(mpls_rtnl_msg_handlers); 2855 if (err) 2856 goto out_unregister_rtnl_af; 2857 2858 err = ipgre_tunnel_encap_add_mpls_ops(); 2859 if (err) { 2860 pr_err("Can't add mpls over gre tunnel ops\n"); 2861 goto out_unregister_rtnl; 2862 } 2863 2864 err = 0; 2865 out: 2866 return err; 2867 2868 out_unregister_rtnl: 2869 rtnl_unregister_many(mpls_rtnl_msg_handlers); 2870 out_unregister_rtnl_af: 2871 rtnl_af_unregister(&mpls_af_ops); 2872 out_unregister_dev_type: 2873 dev_remove_pack(&mpls_packet_type); 2874 unregister_netdevice_notifier(&mpls_dev_notifier); 2875 out_unregister_pernet: 2876 unregister_pernet_subsys(&mpls_net_ops); 2877 goto out; 2878 } 2879 module_init(mpls_init); 2880 2881 static void __exit mpls_exit(void) 2882 { 2883 rtnl_unregister_all(PF_MPLS); 2884 rtnl_af_unregister(&mpls_af_ops); 2885 dev_remove_pack(&mpls_packet_type); 2886 unregister_netdevice_notifier(&mpls_dev_notifier); 2887 unregister_pernet_subsys(&mpls_net_ops); 2888 ipgre_tunnel_encap_del_mpls_ops(); 2889 } 2890 module_exit(mpls_exit); 2891 2892 MODULE_DESCRIPTION("MultiProtocol Label Switching"); 2893 MODULE_LICENSE("GPL v2"); 2894 MODULE_ALIAS_NETPROTO(PF_MPLS); 2895