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 *mpls_route_input_rcu(struct net *net, unsigned int index) 86 { 87 struct mpls_route __rcu **platform_label; 88 89 if (index >= net->mpls.platform_labels) 90 return NULL; 91 92 platform_label = rcu_dereference(net->mpls.platform_label); 93 return rcu_dereference(platform_label[index]); 94 } 95 96 bool mpls_output_possible(const struct net_device *dev) 97 { 98 return dev && (dev->flags & IFF_UP) && netif_carrier_ok(dev); 99 } 100 EXPORT_SYMBOL_GPL(mpls_output_possible); 101 102 static u8 *__mpls_nh_via(struct mpls_route *rt, struct mpls_nh *nh) 103 { 104 return (u8 *)nh + rt->rt_via_offset; 105 } 106 107 static const u8 *mpls_nh_via(const struct mpls_route *rt, 108 const struct mpls_nh *nh) 109 { 110 return __mpls_nh_via((struct mpls_route *)rt, (struct mpls_nh *)nh); 111 } 112 113 static unsigned int mpls_nh_header_size(const struct mpls_nh *nh) 114 { 115 /* The size of the layer 2.5 labels to be added for this route */ 116 return nh->nh_labels * sizeof(struct mpls_shim_hdr); 117 } 118 119 unsigned int mpls_dev_mtu(const struct net_device *dev) 120 { 121 /* The amount of data the layer 2 frame can hold */ 122 return dev->mtu; 123 } 124 EXPORT_SYMBOL_GPL(mpls_dev_mtu); 125 126 bool mpls_pkt_too_big(const struct sk_buff *skb, unsigned int mtu) 127 { 128 if (skb->len <= mtu) 129 return false; 130 131 if (skb_is_gso(skb) && skb_gso_validate_network_len(skb, mtu)) 132 return false; 133 134 return true; 135 } 136 EXPORT_SYMBOL_GPL(mpls_pkt_too_big); 137 138 void mpls_stats_inc_outucastpkts(struct net *net, 139 struct net_device *dev, 140 const struct sk_buff *skb) 141 { 142 struct mpls_dev *mdev; 143 144 if (skb->protocol == htons(ETH_P_MPLS_UC)) { 145 mdev = mpls_dev_rcu(dev); 146 if (mdev) 147 MPLS_INC_STATS_LEN(mdev, skb->len, 148 tx_packets, 149 tx_bytes); 150 } else if (skb->protocol == htons(ETH_P_IP)) { 151 IP_UPD_PO_STATS(net, IPSTATS_MIB_OUT, skb->len); 152 #if IS_ENABLED(CONFIG_IPV6) 153 } else if (skb->protocol == htons(ETH_P_IPV6)) { 154 struct inet6_dev *in6dev = in6_dev_rcu(dev); 155 156 if (in6dev) 157 IP6_UPD_PO_STATS(net, in6dev, 158 IPSTATS_MIB_OUT, skb->len); 159 #endif 160 } 161 } 162 EXPORT_SYMBOL_GPL(mpls_stats_inc_outucastpkts); 163 164 static u32 mpls_multipath_hash(struct mpls_route *rt, struct sk_buff *skb) 165 { 166 struct mpls_entry_decoded dec; 167 unsigned int mpls_hdr_len = 0; 168 struct mpls_shim_hdr *hdr; 169 bool eli_seen = false; 170 int label_index; 171 u32 hash = 0; 172 173 for (label_index = 0; label_index < MAX_MP_SELECT_LABELS; 174 label_index++) { 175 mpls_hdr_len += sizeof(*hdr); 176 if (!pskb_may_pull(skb, mpls_hdr_len)) 177 break; 178 179 /* Read and decode the current label */ 180 hdr = mpls_hdr(skb) + label_index; 181 dec = mpls_entry_decode(hdr); 182 183 /* RFC6790 - reserved labels MUST NOT be used as keys 184 * for the load-balancing function 185 */ 186 if (likely(dec.label >= MPLS_LABEL_FIRST_UNRESERVED)) { 187 hash = jhash_1word(dec.label, hash); 188 189 /* The entropy label follows the entropy label 190 * indicator, so this means that the entropy 191 * label was just added to the hash - no need to 192 * go any deeper either in the label stack or in the 193 * payload 194 */ 195 if (eli_seen) 196 break; 197 } else if (dec.label == MPLS_LABEL_ENTROPY) { 198 eli_seen = true; 199 } 200 201 if (!dec.bos) 202 continue; 203 204 /* found bottom label; does skb have room for a header? */ 205 if (pskb_may_pull(skb, mpls_hdr_len + sizeof(struct iphdr))) { 206 const struct iphdr *v4hdr; 207 208 v4hdr = (const struct iphdr *)(hdr + 1); 209 if (v4hdr->version == 4) { 210 hash = jhash_3words(ntohl(v4hdr->saddr), 211 ntohl(v4hdr->daddr), 212 v4hdr->protocol, hash); 213 } else if (v4hdr->version == 6 && 214 pskb_may_pull(skb, mpls_hdr_len + 215 sizeof(struct ipv6hdr))) { 216 const struct ipv6hdr *v6hdr; 217 218 v6hdr = (const struct ipv6hdr *)(hdr + 1); 219 hash = __ipv6_addr_jhash(&v6hdr->saddr, hash); 220 hash = __ipv6_addr_jhash(&v6hdr->daddr, hash); 221 hash = jhash_1word(v6hdr->nexthdr, hash); 222 } 223 } 224 225 break; 226 } 227 228 return hash; 229 } 230 231 static struct mpls_nh *mpls_get_nexthop(struct mpls_route *rt, u8 index) 232 { 233 return (struct mpls_nh *)((u8 *)rt->rt_nh + index * rt->rt_nh_size); 234 } 235 236 /* number of alive nexthops (rt->rt_nhn_alive) and the flags for 237 * a next hop (nh->nh_flags) are modified by netdev event handlers. 238 * Since those fields can change at any moment, use READ_ONCE to 239 * access both. 240 */ 241 static const struct mpls_nh *mpls_select_multipath(struct mpls_route *rt, 242 struct sk_buff *skb) 243 { 244 u32 hash = 0; 245 int nh_index = 0; 246 int n = 0; 247 u8 alive; 248 249 /* No need to look further into packet if there's only 250 * one path 251 */ 252 if (rt->rt_nhn == 1) 253 return rt->rt_nh; 254 255 alive = READ_ONCE(rt->rt_nhn_alive); 256 if (alive == 0) 257 return NULL; 258 259 hash = mpls_multipath_hash(rt, skb); 260 nh_index = hash % alive; 261 if (alive == rt->rt_nhn) 262 goto out; 263 for_nexthops(rt) { 264 unsigned int nh_flags = READ_ONCE(nh->nh_flags); 265 266 if (nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)) 267 continue; 268 if (n == nh_index) 269 return nh; 270 n++; 271 } endfor_nexthops(rt); 272 273 out: 274 return mpls_get_nexthop(rt, nh_index); 275 } 276 277 static bool mpls_egress(struct net *net, struct mpls_route *rt, 278 struct sk_buff *skb, struct mpls_entry_decoded dec) 279 { 280 enum mpls_payload_type payload_type; 281 bool success = false; 282 283 /* The IPv4 code below accesses through the IPv4 header 284 * checksum, which is 12 bytes into the packet. 285 * The IPv6 code below accesses through the IPv6 hop limit 286 * which is 8 bytes into the packet. 287 * 288 * For all supported cases there should always be at least 12 289 * bytes of packet data present. The IPv4 header is 20 bytes 290 * without options and the IPv6 header is always 40 bytes 291 * long. 292 */ 293 if (!pskb_may_pull(skb, 12)) 294 return false; 295 296 payload_type = rt->rt_payload_type; 297 if (payload_type == MPT_UNSPEC) 298 payload_type = ip_hdr(skb)->version; 299 300 switch (payload_type) { 301 case MPT_IPV4: { 302 struct iphdr *hdr4 = ip_hdr(skb); 303 u8 new_ttl; 304 skb->protocol = htons(ETH_P_IP); 305 306 /* If propagating TTL, take the decremented TTL from 307 * the incoming MPLS header, otherwise decrement the 308 * TTL, but only if not 0 to avoid underflow. 309 */ 310 if (rt->rt_ttl_propagate == MPLS_TTL_PROP_ENABLED || 311 (rt->rt_ttl_propagate == MPLS_TTL_PROP_DEFAULT && 312 net->mpls.ip_ttl_propagate)) 313 new_ttl = dec.ttl; 314 else 315 new_ttl = hdr4->ttl ? hdr4->ttl - 1 : 0; 316 317 csum_replace2(&hdr4->check, 318 htons(hdr4->ttl << 8), 319 htons(new_ttl << 8)); 320 hdr4->ttl = new_ttl; 321 success = true; 322 break; 323 } 324 case MPT_IPV6: { 325 struct ipv6hdr *hdr6 = ipv6_hdr(skb); 326 skb->protocol = htons(ETH_P_IPV6); 327 328 /* If propagating TTL, take the decremented TTL from 329 * the incoming MPLS header, otherwise decrement the 330 * hop limit, but only if not 0 to avoid underflow. 331 */ 332 if (rt->rt_ttl_propagate == MPLS_TTL_PROP_ENABLED || 333 (rt->rt_ttl_propagate == MPLS_TTL_PROP_DEFAULT && 334 net->mpls.ip_ttl_propagate)) 335 hdr6->hop_limit = dec.ttl; 336 else if (hdr6->hop_limit) 337 hdr6->hop_limit = hdr6->hop_limit - 1; 338 success = true; 339 break; 340 } 341 case MPT_UNSPEC: 342 /* Should have decided which protocol it is by now */ 343 break; 344 } 345 346 return success; 347 } 348 349 static int mpls_forward(struct sk_buff *skb, struct net_device *dev, 350 struct packet_type *pt, struct net_device *orig_dev) 351 { 352 struct net *net = dev_net_rcu(dev); 353 struct mpls_shim_hdr *hdr; 354 const struct mpls_nh *nh; 355 struct mpls_route *rt; 356 struct mpls_entry_decoded dec; 357 struct net_device *out_dev; 358 struct mpls_dev *out_mdev; 359 struct mpls_dev *mdev; 360 unsigned int hh_len; 361 unsigned int new_header_size; 362 unsigned int mtu; 363 int err; 364 365 /* Careful this entire function runs inside of an rcu critical section */ 366 367 mdev = mpls_dev_rcu(dev); 368 if (!mdev) 369 goto drop; 370 371 MPLS_INC_STATS_LEN(mdev, skb->len, rx_packets, 372 rx_bytes); 373 374 if (!mdev->input_enabled) { 375 MPLS_INC_STATS(mdev, rx_dropped); 376 goto drop; 377 } 378 379 if (skb->pkt_type != PACKET_HOST) 380 goto err; 381 382 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) 383 goto err; 384 385 if (!pskb_may_pull(skb, sizeof(*hdr))) 386 goto err; 387 388 skb_dst_drop(skb); 389 390 /* Read and decode the label */ 391 hdr = mpls_hdr(skb); 392 dec = mpls_entry_decode(hdr); 393 394 rt = mpls_route_input_rcu(net, dec.label); 395 if (!rt) { 396 MPLS_INC_STATS(mdev, rx_noroute); 397 goto drop; 398 } 399 400 nh = mpls_select_multipath(rt, skb); 401 if (!nh) 402 goto err; 403 404 /* Pop the label */ 405 skb_pull(skb, sizeof(*hdr)); 406 skb_reset_network_header(skb); 407 408 skb_orphan(skb); 409 410 if (skb_warn_if_lro(skb)) 411 goto err; 412 413 skb_forward_csum(skb); 414 415 /* Verify ttl is valid */ 416 if (dec.ttl <= 1) 417 goto err; 418 419 /* Find the output device */ 420 out_dev = nh->nh_dev; 421 if (!mpls_output_possible(out_dev)) 422 goto tx_err; 423 424 /* Verify the destination can hold the packet */ 425 new_header_size = mpls_nh_header_size(nh); 426 mtu = mpls_dev_mtu(out_dev); 427 if (mpls_pkt_too_big(skb, mtu - new_header_size)) 428 goto tx_err; 429 430 hh_len = LL_RESERVED_SPACE(out_dev); 431 if (!out_dev->header_ops) 432 hh_len = 0; 433 434 /* Ensure there is enough space for the headers in the skb */ 435 if (skb_cow(skb, hh_len + new_header_size)) 436 goto tx_err; 437 438 skb->dev = out_dev; 439 skb->protocol = htons(ETH_P_MPLS_UC); 440 441 dec.ttl -= 1; 442 if (unlikely(!new_header_size && dec.bos)) { 443 /* Penultimate hop popping */ 444 if (!mpls_egress(net, rt, skb, dec)) 445 goto err; 446 } else { 447 bool bos; 448 int i; 449 skb_push(skb, new_header_size); 450 skb_reset_network_header(skb); 451 /* Push the new labels */ 452 hdr = mpls_hdr(skb); 453 bos = dec.bos; 454 for (i = nh->nh_labels - 1; i >= 0; i--) { 455 hdr[i] = mpls_entry_encode(nh->nh_label[i], 456 dec.ttl, 0, bos); 457 bos = false; 458 } 459 } 460 461 mpls_stats_inc_outucastpkts(net, out_dev, skb); 462 463 /* If via wasn't specified then send out using device address */ 464 if (nh->nh_via_table == MPLS_NEIGH_TABLE_UNSPEC) 465 err = neigh_xmit(NEIGH_LINK_TABLE, out_dev, 466 out_dev->dev_addr, skb); 467 else 468 err = neigh_xmit(nh->nh_via_table, out_dev, 469 mpls_nh_via(rt, nh), skb); 470 if (err) 471 net_dbg_ratelimited("%s: packet transmission failed: %d\n", 472 __func__, err); 473 return 0; 474 475 tx_err: 476 out_mdev = out_dev ? mpls_dev_rcu(out_dev) : NULL; 477 if (out_mdev) 478 MPLS_INC_STATS(out_mdev, tx_errors); 479 goto drop; 480 err: 481 MPLS_INC_STATS(mdev, rx_errors); 482 drop: 483 kfree_skb(skb); 484 return NET_RX_DROP; 485 } 486 487 static struct packet_type mpls_packet_type __read_mostly = { 488 .type = cpu_to_be16(ETH_P_MPLS_UC), 489 .func = mpls_forward, 490 }; 491 492 static const struct nla_policy rtm_mpls_policy[RTA_MAX+1] = { 493 [RTA_DST] = { .type = NLA_U32 }, 494 [RTA_OIF] = { .type = NLA_U32 }, 495 [RTA_TTL_PROPAGATE] = { .type = NLA_U8 }, 496 }; 497 498 struct mpls_route_config { 499 u32 rc_protocol; 500 u32 rc_ifindex; 501 u8 rc_via_table; 502 u8 rc_via_alen; 503 u8 rc_via[MAX_VIA_ALEN]; 504 u32 rc_label; 505 u8 rc_ttl_propagate; 506 u8 rc_output_labels; 507 u32 rc_output_label[MAX_NEW_LABELS]; 508 u32 rc_nlflags; 509 enum mpls_payload_type rc_payload_type; 510 struct nl_info rc_nlinfo; 511 struct rtnexthop *rc_mp; 512 int rc_mp_len; 513 }; 514 515 /* all nexthops within a route have the same size based on max 516 * number of labels and max via length for a hop 517 */ 518 static struct mpls_route *mpls_rt_alloc(u8 num_nh, u8 max_alen, u8 max_labels) 519 { 520 u8 nh_size = MPLS_NH_SIZE(max_labels, max_alen); 521 struct mpls_route *rt; 522 size_t size; 523 524 size = sizeof(*rt) + num_nh * nh_size; 525 if (size > MAX_MPLS_ROUTE_MEM) 526 return ERR_PTR(-EINVAL); 527 528 rt = kzalloc(size, GFP_KERNEL); 529 if (!rt) 530 return ERR_PTR(-ENOMEM); 531 532 rt->rt_nhn = num_nh; 533 rt->rt_nhn_alive = num_nh; 534 rt->rt_nh_size = nh_size; 535 rt->rt_via_offset = MPLS_NH_VIA_OFF(max_labels); 536 537 return rt; 538 } 539 540 static void mpls_rt_free_rcu(struct rcu_head *head) 541 { 542 struct mpls_route *rt; 543 544 rt = container_of(head, struct mpls_route, rt_rcu); 545 546 change_nexthops(rt) { 547 netdev_put(nh->nh_dev, &nh->nh_dev_tracker); 548 } endfor_nexthops(rt); 549 550 kfree(rt); 551 } 552 553 static void mpls_rt_free(struct mpls_route *rt) 554 { 555 if (rt) 556 call_rcu(&rt->rt_rcu, mpls_rt_free_rcu); 557 } 558 559 static void mpls_notify_route(struct net *net, unsigned index, 560 struct mpls_route *old, struct mpls_route *new, 561 const struct nl_info *info) 562 { 563 struct nlmsghdr *nlh = info ? info->nlh : NULL; 564 unsigned portid = info ? info->portid : 0; 565 int event = new ? RTM_NEWROUTE : RTM_DELROUTE; 566 struct mpls_route *rt = new ? new : old; 567 unsigned nlm_flags = (old && new) ? NLM_F_REPLACE : 0; 568 /* Ignore reserved labels for now */ 569 if (rt && (index >= MPLS_LABEL_FIRST_UNRESERVED)) 570 rtmsg_lfib(event, index, rt, nlh, net, portid, nlm_flags); 571 } 572 573 static void mpls_route_update(struct net *net, unsigned index, 574 struct mpls_route *new, 575 const struct nl_info *info) 576 { 577 struct mpls_route __rcu **platform_label; 578 struct mpls_route *rt; 579 580 platform_label = mpls_dereference(net, net->mpls.platform_label); 581 rt = mpls_dereference(net, platform_label[index]); 582 rcu_assign_pointer(platform_label[index], new); 583 584 mpls_notify_route(net, index, rt, new, info); 585 586 /* If we removed a route free it now */ 587 mpls_rt_free(rt); 588 } 589 590 static unsigned int find_free_label(struct net *net) 591 { 592 unsigned int index; 593 594 for (index = MPLS_LABEL_FIRST_UNRESERVED; 595 index < net->mpls.platform_labels; 596 index++) { 597 if (!mpls_route_input(net, index)) 598 return index; 599 } 600 601 return LABEL_NOT_SPECIFIED; 602 } 603 604 #if IS_ENABLED(CONFIG_INET) 605 static struct net_device *inet_fib_lookup_dev(struct net *net, 606 struct mpls_nh *nh, 607 const void *addr) 608 { 609 struct net_device *dev; 610 struct rtable *rt; 611 struct in_addr daddr; 612 613 memcpy(&daddr, addr, sizeof(struct in_addr)); 614 rt = ip_route_output(net, daddr.s_addr, 0, 0, 0, RT_SCOPE_UNIVERSE); 615 if (IS_ERR(rt)) 616 return ERR_CAST(rt); 617 618 dev = rt->dst.dev; 619 netdev_hold(dev, &nh->nh_dev_tracker, GFP_KERNEL); 620 ip_rt_put(rt); 621 622 return dev; 623 } 624 #else 625 static struct net_device *inet_fib_lookup_dev(struct net *net, 626 struct mpls_nh *nh, 627 const void *addr) 628 { 629 return ERR_PTR(-EAFNOSUPPORT); 630 } 631 #endif 632 633 #if IS_ENABLED(CONFIG_IPV6) 634 static struct net_device *inet6_fib_lookup_dev(struct net *net, 635 struct mpls_nh *nh, 636 const void *addr) 637 { 638 struct net_device *dev; 639 struct dst_entry *dst; 640 struct flowi6 fl6; 641 642 memset(&fl6, 0, sizeof(fl6)); 643 memcpy(&fl6.daddr, addr, sizeof(struct in6_addr)); 644 dst = ip6_dst_lookup_flow(net, NULL, &fl6, NULL); 645 if (IS_ERR(dst)) 646 return ERR_CAST(dst); 647 648 dev = dst->dev; 649 netdev_hold(dev, &nh->nh_dev_tracker, GFP_KERNEL); 650 dst_release(dst); 651 652 return dev; 653 } 654 #else 655 static struct net_device *inet6_fib_lookup_dev(struct net *net, 656 struct mpls_nh *nh, 657 const void *addr) 658 { 659 return ERR_PTR(-EAFNOSUPPORT); 660 } 661 #endif 662 663 static struct net_device *find_outdev(struct net *net, 664 struct mpls_route *rt, 665 struct mpls_nh *nh, int oif) 666 { 667 struct net_device *dev = NULL; 668 669 if (!oif) { 670 switch (nh->nh_via_table) { 671 case NEIGH_ARP_TABLE: 672 dev = inet_fib_lookup_dev(net, nh, mpls_nh_via(rt, nh)); 673 break; 674 case NEIGH_ND_TABLE: 675 dev = inet6_fib_lookup_dev(net, nh, mpls_nh_via(rt, nh)); 676 break; 677 case NEIGH_LINK_TABLE: 678 break; 679 } 680 } else { 681 dev = netdev_get_by_index(net, oif, 682 &nh->nh_dev_tracker, GFP_KERNEL); 683 } 684 685 if (!dev) 686 return ERR_PTR(-ENODEV); 687 688 if (IS_ERR(dev)) 689 return dev; 690 691 nh->nh_dev = dev; 692 693 return dev; 694 } 695 696 static int mpls_nh_assign_dev(struct net *net, struct mpls_route *rt, 697 struct mpls_nh *nh, int oif) 698 { 699 struct net_device *dev = NULL; 700 int err = -ENODEV; 701 702 dev = find_outdev(net, rt, nh, oif); 703 if (IS_ERR(dev)) { 704 err = PTR_ERR(dev); 705 goto errout; 706 } 707 708 /* Ensure this is a supported device */ 709 err = -EINVAL; 710 if (!mpls_dev_get(net, dev)) 711 goto errout_put; 712 713 if ((nh->nh_via_table == NEIGH_LINK_TABLE) && 714 (dev->addr_len != nh->nh_via_alen)) 715 goto errout_put; 716 717 if (!(dev->flags & IFF_UP)) { 718 nh->nh_flags |= RTNH_F_DEAD; 719 } else { 720 unsigned int flags; 721 722 flags = netif_get_flags(dev); 723 if (!(flags & (IFF_RUNNING | IFF_LOWER_UP))) 724 nh->nh_flags |= RTNH_F_LINKDOWN; 725 } 726 727 return 0; 728 729 errout_put: 730 netdev_put(nh->nh_dev, &nh->nh_dev_tracker); 731 nh->nh_dev = NULL; 732 errout: 733 return err; 734 } 735 736 static int nla_get_via(const struct nlattr *nla, u8 *via_alen, u8 *via_table, 737 u8 via_addr[], struct netlink_ext_ack *extack) 738 { 739 struct rtvia *via = nla_data(nla); 740 int err = -EINVAL; 741 int alen; 742 743 if (nla_len(nla) < offsetof(struct rtvia, rtvia_addr)) { 744 NL_SET_ERR_MSG_ATTR(extack, nla, 745 "Invalid attribute length for RTA_VIA"); 746 goto errout; 747 } 748 alen = nla_len(nla) - 749 offsetof(struct rtvia, rtvia_addr); 750 if (alen > MAX_VIA_ALEN) { 751 NL_SET_ERR_MSG_ATTR(extack, nla, 752 "Invalid address length for RTA_VIA"); 753 goto errout; 754 } 755 756 /* Validate the address family */ 757 switch (via->rtvia_family) { 758 case AF_PACKET: 759 *via_table = NEIGH_LINK_TABLE; 760 break; 761 case AF_INET: 762 *via_table = NEIGH_ARP_TABLE; 763 if (alen != 4) 764 goto errout; 765 break; 766 case AF_INET6: 767 *via_table = NEIGH_ND_TABLE; 768 if (alen != 16) 769 goto errout; 770 break; 771 default: 772 /* Unsupported address family */ 773 goto errout; 774 } 775 776 memcpy(via_addr, via->rtvia_addr, alen); 777 *via_alen = alen; 778 err = 0; 779 780 errout: 781 return err; 782 } 783 784 static int mpls_nh_build_from_cfg(struct mpls_route_config *cfg, 785 struct mpls_route *rt) 786 { 787 struct net *net = cfg->rc_nlinfo.nl_net; 788 struct mpls_nh *nh = rt->rt_nh; 789 int err; 790 int i; 791 792 if (!nh) 793 return -ENOMEM; 794 795 nh->nh_labels = cfg->rc_output_labels; 796 for (i = 0; i < nh->nh_labels; i++) 797 nh->nh_label[i] = cfg->rc_output_label[i]; 798 799 nh->nh_via_table = cfg->rc_via_table; 800 memcpy(__mpls_nh_via(rt, nh), cfg->rc_via, cfg->rc_via_alen); 801 nh->nh_via_alen = cfg->rc_via_alen; 802 803 err = mpls_nh_assign_dev(net, rt, nh, cfg->rc_ifindex); 804 if (err) 805 goto errout; 806 807 if (nh->nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)) 808 rt->rt_nhn_alive--; 809 810 return 0; 811 812 errout: 813 return err; 814 } 815 816 static int mpls_nh_build(struct net *net, struct mpls_route *rt, 817 struct mpls_nh *nh, int oif, struct nlattr *via, 818 struct nlattr *newdst, u8 max_labels, 819 struct netlink_ext_ack *extack) 820 { 821 int err = -ENOMEM; 822 823 if (!nh) 824 goto errout; 825 826 if (newdst) { 827 err = nla_get_labels(newdst, max_labels, &nh->nh_labels, 828 nh->nh_label, extack); 829 if (err) 830 goto errout; 831 } 832 833 if (via) { 834 err = nla_get_via(via, &nh->nh_via_alen, &nh->nh_via_table, 835 __mpls_nh_via(rt, nh), extack); 836 if (err) 837 goto errout; 838 } else { 839 nh->nh_via_table = MPLS_NEIGH_TABLE_UNSPEC; 840 } 841 842 err = mpls_nh_assign_dev(net, rt, nh, oif); 843 if (err) 844 goto errout; 845 846 return 0; 847 848 errout: 849 return err; 850 } 851 852 static u8 mpls_count_nexthops(struct rtnexthop *rtnh, int len, 853 u8 cfg_via_alen, u8 *max_via_alen, 854 u8 *max_labels) 855 { 856 int remaining = len; 857 u8 nhs = 0; 858 859 *max_via_alen = 0; 860 *max_labels = 0; 861 862 while (rtnh_ok(rtnh, remaining)) { 863 struct nlattr *nla, *attrs = rtnh_attrs(rtnh); 864 int attrlen; 865 u8 n_labels = 0; 866 867 attrlen = rtnh_attrlen(rtnh); 868 nla = nla_find(attrs, attrlen, RTA_VIA); 869 if (nla && nla_len(nla) >= 870 offsetof(struct rtvia, rtvia_addr)) { 871 int via_alen = nla_len(nla) - 872 offsetof(struct rtvia, rtvia_addr); 873 874 if (via_alen <= MAX_VIA_ALEN) 875 *max_via_alen = max_t(u16, *max_via_alen, 876 via_alen); 877 } 878 879 nla = nla_find(attrs, attrlen, RTA_NEWDST); 880 if (nla && 881 nla_get_labels(nla, MAX_NEW_LABELS, &n_labels, 882 NULL, NULL) != 0) 883 return 0; 884 885 *max_labels = max_t(u8, *max_labels, n_labels); 886 887 /* number of nexthops is tracked by a u8. 888 * Check for overflow. 889 */ 890 if (nhs == 255) 891 return 0; 892 nhs++; 893 894 rtnh = rtnh_next(rtnh, &remaining); 895 } 896 897 /* leftover implies invalid nexthop configuration, discard it */ 898 return remaining > 0 ? 0 : nhs; 899 } 900 901 static int mpls_nh_build_multi(struct mpls_route_config *cfg, 902 struct mpls_route *rt, u8 max_labels, 903 struct netlink_ext_ack *extack) 904 { 905 struct rtnexthop *rtnh = cfg->rc_mp; 906 struct nlattr *nla_via, *nla_newdst; 907 int remaining = cfg->rc_mp_len; 908 int err = 0; 909 910 rt->rt_nhn = 0; 911 912 change_nexthops(rt) { 913 int attrlen; 914 915 nla_via = NULL; 916 nla_newdst = NULL; 917 918 err = -EINVAL; 919 if (!rtnh_ok(rtnh, remaining)) 920 goto errout; 921 922 /* neither weighted multipath nor any flags 923 * are supported 924 */ 925 if (rtnh->rtnh_hops || rtnh->rtnh_flags) 926 goto errout; 927 928 attrlen = rtnh_attrlen(rtnh); 929 if (attrlen > 0) { 930 struct nlattr *attrs = rtnh_attrs(rtnh); 931 932 nla_via = nla_find(attrs, attrlen, RTA_VIA); 933 nla_newdst = nla_find(attrs, attrlen, RTA_NEWDST); 934 } 935 936 err = mpls_nh_build(cfg->rc_nlinfo.nl_net, rt, nh, 937 rtnh->rtnh_ifindex, nla_via, nla_newdst, 938 max_labels, extack); 939 if (err) 940 goto errout; 941 942 if (nh->nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)) 943 rt->rt_nhn_alive--; 944 945 rtnh = rtnh_next(rtnh, &remaining); 946 rt->rt_nhn++; 947 } endfor_nexthops(rt); 948 949 return 0; 950 951 errout: 952 return err; 953 } 954 955 static bool mpls_label_ok(struct net *net, unsigned int *index, 956 struct netlink_ext_ack *extack) 957 { 958 /* Reserved labels may not be set */ 959 if (*index < MPLS_LABEL_FIRST_UNRESERVED) { 960 NL_SET_ERR_MSG(extack, 961 "Invalid label - must be MPLS_LABEL_FIRST_UNRESERVED or higher"); 962 return false; 963 } 964 965 /* The full 20 bit range may not be supported. */ 966 if (*index >= net->mpls.platform_labels) { 967 NL_SET_ERR_MSG(extack, 968 "Label >= configured maximum in platform_labels"); 969 return false; 970 } 971 972 *index = array_index_nospec(*index, net->mpls.platform_labels); 973 974 return true; 975 } 976 977 static int mpls_route_add(struct mpls_route_config *cfg, 978 struct netlink_ext_ack *extack) 979 { 980 struct net *net = cfg->rc_nlinfo.nl_net; 981 struct mpls_route *rt, *old; 982 int err = -EINVAL; 983 u8 max_via_alen; 984 unsigned index; 985 u8 max_labels; 986 u8 nhs; 987 988 index = cfg->rc_label; 989 990 /* If a label was not specified during insert pick one */ 991 if ((index == LABEL_NOT_SPECIFIED) && 992 (cfg->rc_nlflags & NLM_F_CREATE)) { 993 index = find_free_label(net); 994 } 995 996 if (!mpls_label_ok(net, &index, extack)) 997 goto errout; 998 999 /* Append makes no sense with mpls */ 1000 err = -EOPNOTSUPP; 1001 if (cfg->rc_nlflags & NLM_F_APPEND) { 1002 NL_SET_ERR_MSG(extack, "MPLS does not support route append"); 1003 goto errout; 1004 } 1005 1006 err = -EEXIST; 1007 old = mpls_route_input(net, index); 1008 if ((cfg->rc_nlflags & NLM_F_EXCL) && old) 1009 goto errout; 1010 1011 err = -EEXIST; 1012 if (!(cfg->rc_nlflags & NLM_F_REPLACE) && old) 1013 goto errout; 1014 1015 err = -ENOENT; 1016 if (!(cfg->rc_nlflags & NLM_F_CREATE) && !old) 1017 goto errout; 1018 1019 err = -EINVAL; 1020 if (cfg->rc_mp) { 1021 nhs = mpls_count_nexthops(cfg->rc_mp, cfg->rc_mp_len, 1022 cfg->rc_via_alen, &max_via_alen, 1023 &max_labels); 1024 } else { 1025 max_via_alen = cfg->rc_via_alen; 1026 max_labels = cfg->rc_output_labels; 1027 nhs = 1; 1028 } 1029 1030 if (nhs == 0) { 1031 NL_SET_ERR_MSG(extack, "Route does not contain a nexthop"); 1032 goto errout; 1033 } 1034 1035 rt = mpls_rt_alloc(nhs, max_via_alen, max_labels); 1036 if (IS_ERR(rt)) { 1037 err = PTR_ERR(rt); 1038 goto errout; 1039 } 1040 1041 rt->rt_protocol = cfg->rc_protocol; 1042 rt->rt_payload_type = cfg->rc_payload_type; 1043 rt->rt_ttl_propagate = cfg->rc_ttl_propagate; 1044 1045 if (cfg->rc_mp) 1046 err = mpls_nh_build_multi(cfg, rt, max_labels, extack); 1047 else 1048 err = mpls_nh_build_from_cfg(cfg, rt); 1049 if (err) 1050 goto freert; 1051 1052 mpls_route_update(net, index, rt, &cfg->rc_nlinfo); 1053 1054 return 0; 1055 1056 freert: 1057 mpls_rt_free(rt); 1058 errout: 1059 return err; 1060 } 1061 1062 static int mpls_route_del(struct mpls_route_config *cfg, 1063 struct netlink_ext_ack *extack) 1064 { 1065 struct net *net = cfg->rc_nlinfo.nl_net; 1066 unsigned index; 1067 int err = -EINVAL; 1068 1069 index = cfg->rc_label; 1070 1071 if (!mpls_label_ok(net, &index, extack)) 1072 goto errout; 1073 1074 mpls_route_update(net, index, NULL, &cfg->rc_nlinfo); 1075 1076 err = 0; 1077 errout: 1078 return err; 1079 } 1080 1081 static void mpls_get_stats(struct mpls_dev *mdev, 1082 struct mpls_link_stats *stats) 1083 { 1084 struct mpls_pcpu_stats *p; 1085 int i; 1086 1087 memset(stats, 0, sizeof(*stats)); 1088 1089 for_each_possible_cpu(i) { 1090 struct mpls_link_stats local; 1091 unsigned int start; 1092 1093 p = per_cpu_ptr(mdev->stats, i); 1094 do { 1095 start = u64_stats_fetch_begin(&p->syncp); 1096 local = p->stats; 1097 } while (u64_stats_fetch_retry(&p->syncp, start)); 1098 1099 stats->rx_packets += local.rx_packets; 1100 stats->rx_bytes += local.rx_bytes; 1101 stats->tx_packets += local.tx_packets; 1102 stats->tx_bytes += local.tx_bytes; 1103 stats->rx_errors += local.rx_errors; 1104 stats->tx_errors += local.tx_errors; 1105 stats->rx_dropped += local.rx_dropped; 1106 stats->tx_dropped += local.tx_dropped; 1107 stats->rx_noroute += local.rx_noroute; 1108 } 1109 } 1110 1111 static int mpls_fill_stats_af(struct sk_buff *skb, 1112 const struct net_device *dev) 1113 { 1114 struct mpls_link_stats *stats; 1115 struct mpls_dev *mdev; 1116 struct nlattr *nla; 1117 1118 mdev = mpls_dev_rcu(dev); 1119 if (!mdev) 1120 return -ENODATA; 1121 1122 nla = nla_reserve_64bit(skb, MPLS_STATS_LINK, 1123 sizeof(struct mpls_link_stats), 1124 MPLS_STATS_UNSPEC); 1125 if (!nla) 1126 return -EMSGSIZE; 1127 1128 stats = nla_data(nla); 1129 mpls_get_stats(mdev, stats); 1130 1131 return 0; 1132 } 1133 1134 static size_t mpls_get_stats_af_size(const struct net_device *dev) 1135 { 1136 struct mpls_dev *mdev; 1137 1138 mdev = mpls_dev_rcu(dev); 1139 if (!mdev) 1140 return 0; 1141 1142 return nla_total_size_64bit(sizeof(struct mpls_link_stats)); 1143 } 1144 1145 static int mpls_netconf_fill_devconf(struct sk_buff *skb, struct mpls_dev *mdev, 1146 u32 portid, u32 seq, int event, 1147 unsigned int flags, int type) 1148 { 1149 struct nlmsghdr *nlh; 1150 struct netconfmsg *ncm; 1151 bool all = false; 1152 1153 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 1154 flags); 1155 if (!nlh) 1156 return -EMSGSIZE; 1157 1158 if (type == NETCONFA_ALL) 1159 all = true; 1160 1161 ncm = nlmsg_data(nlh); 1162 ncm->ncm_family = AF_MPLS; 1163 1164 if (nla_put_s32(skb, NETCONFA_IFINDEX, mdev->dev->ifindex) < 0) 1165 goto nla_put_failure; 1166 1167 if ((all || type == NETCONFA_INPUT) && 1168 nla_put_s32(skb, NETCONFA_INPUT, 1169 READ_ONCE(mdev->input_enabled)) < 0) 1170 goto nla_put_failure; 1171 1172 nlmsg_end(skb, nlh); 1173 return 0; 1174 1175 nla_put_failure: 1176 nlmsg_cancel(skb, nlh); 1177 return -EMSGSIZE; 1178 } 1179 1180 static int mpls_netconf_msgsize_devconf(int type) 1181 { 1182 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 1183 + nla_total_size(4); /* NETCONFA_IFINDEX */ 1184 bool all = false; 1185 1186 if (type == NETCONFA_ALL) 1187 all = true; 1188 1189 if (all || type == NETCONFA_INPUT) 1190 size += nla_total_size(4); 1191 1192 return size; 1193 } 1194 1195 static void mpls_netconf_notify_devconf(struct net *net, int event, 1196 int type, struct mpls_dev *mdev) 1197 { 1198 struct sk_buff *skb; 1199 int err = -ENOBUFS; 1200 1201 skb = nlmsg_new(mpls_netconf_msgsize_devconf(type), GFP_KERNEL); 1202 if (!skb) 1203 goto errout; 1204 1205 err = mpls_netconf_fill_devconf(skb, mdev, 0, 0, event, 0, type); 1206 if (err < 0) { 1207 /* -EMSGSIZE implies BUG in mpls_netconf_msgsize_devconf() */ 1208 WARN_ON(err == -EMSGSIZE); 1209 kfree_skb(skb); 1210 goto errout; 1211 } 1212 1213 rtnl_notify(skb, net, 0, RTNLGRP_MPLS_NETCONF, NULL, GFP_KERNEL); 1214 return; 1215 errout: 1216 rtnl_set_sk_err(net, RTNLGRP_MPLS_NETCONF, err); 1217 } 1218 1219 static const struct nla_policy devconf_mpls_policy[NETCONFA_MAX + 1] = { 1220 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 1221 }; 1222 1223 static int mpls_netconf_valid_get_req(struct sk_buff *skb, 1224 const struct nlmsghdr *nlh, 1225 struct nlattr **tb, 1226 struct netlink_ext_ack *extack) 1227 { 1228 int i, err; 1229 1230 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) { 1231 NL_SET_ERR_MSG_MOD(extack, 1232 "Invalid header for netconf get request"); 1233 return -EINVAL; 1234 } 1235 1236 if (!netlink_strict_get_check(skb)) 1237 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg), 1238 tb, NETCONFA_MAX, 1239 devconf_mpls_policy, extack); 1240 1241 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg), 1242 tb, NETCONFA_MAX, 1243 devconf_mpls_policy, extack); 1244 if (err) 1245 return err; 1246 1247 for (i = 0; i <= NETCONFA_MAX; i++) { 1248 if (!tb[i]) 1249 continue; 1250 1251 switch (i) { 1252 case NETCONFA_IFINDEX: 1253 break; 1254 default: 1255 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request"); 1256 return -EINVAL; 1257 } 1258 } 1259 1260 return 0; 1261 } 1262 1263 static int mpls_netconf_get_devconf(struct sk_buff *in_skb, 1264 struct nlmsghdr *nlh, 1265 struct netlink_ext_ack *extack) 1266 { 1267 struct net *net = sock_net(in_skb->sk); 1268 struct nlattr *tb[NETCONFA_MAX + 1]; 1269 struct net_device *dev; 1270 struct mpls_dev *mdev; 1271 struct sk_buff *skb; 1272 int ifindex; 1273 int err; 1274 1275 err = mpls_netconf_valid_get_req(in_skb, nlh, tb, extack); 1276 if (err < 0) 1277 goto errout; 1278 1279 if (!tb[NETCONFA_IFINDEX]) { 1280 err = -EINVAL; 1281 goto errout; 1282 } 1283 1284 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 1285 1286 skb = nlmsg_new(mpls_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL); 1287 if (!skb) { 1288 err = -ENOBUFS; 1289 goto errout; 1290 } 1291 1292 rcu_read_lock(); 1293 1294 dev = dev_get_by_index_rcu(net, ifindex); 1295 if (!dev) { 1296 err = -EINVAL; 1297 goto errout_unlock; 1298 } 1299 1300 mdev = mpls_dev_rcu(dev); 1301 if (!mdev) { 1302 err = -EINVAL; 1303 goto errout_unlock; 1304 } 1305 1306 err = mpls_netconf_fill_devconf(skb, mdev, 1307 NETLINK_CB(in_skb).portid, 1308 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 1309 NETCONFA_ALL); 1310 if (err < 0) { 1311 /* -EMSGSIZE implies BUG in mpls_netconf_msgsize_devconf() */ 1312 WARN_ON(err == -EMSGSIZE); 1313 goto errout_unlock; 1314 } 1315 1316 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 1317 1318 rcu_read_unlock(); 1319 errout: 1320 return err; 1321 1322 errout_unlock: 1323 rcu_read_unlock(); 1324 kfree_skb(skb); 1325 goto errout; 1326 } 1327 1328 static int mpls_netconf_dump_devconf(struct sk_buff *skb, 1329 struct netlink_callback *cb) 1330 { 1331 const struct nlmsghdr *nlh = cb->nlh; 1332 struct net *net = sock_net(skb->sk); 1333 struct { 1334 unsigned long ifindex; 1335 } *ctx = (void *)cb->ctx; 1336 struct net_device *dev; 1337 struct mpls_dev *mdev; 1338 int err = 0; 1339 1340 if (cb->strict_check) { 1341 struct netlink_ext_ack *extack = cb->extack; 1342 struct netconfmsg *ncm; 1343 1344 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) { 1345 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request"); 1346 return -EINVAL; 1347 } 1348 1349 if (nlmsg_attrlen(nlh, sizeof(*ncm))) { 1350 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request"); 1351 return -EINVAL; 1352 } 1353 } 1354 1355 rcu_read_lock(); 1356 for_each_netdev_dump(net, dev, ctx->ifindex) { 1357 mdev = mpls_dev_rcu(dev); 1358 if (!mdev) 1359 continue; 1360 err = mpls_netconf_fill_devconf(skb, mdev, 1361 NETLINK_CB(cb->skb).portid, 1362 nlh->nlmsg_seq, 1363 RTM_NEWNETCONF, 1364 NLM_F_MULTI, 1365 NETCONFA_ALL); 1366 if (err < 0) 1367 break; 1368 } 1369 rcu_read_unlock(); 1370 1371 return err; 1372 } 1373 1374 #define MPLS_PERDEV_SYSCTL_OFFSET(field) \ 1375 (&((struct mpls_dev *)0)->field) 1376 1377 static int mpls_conf_proc(const struct ctl_table *ctl, int write, 1378 void *buffer, size_t *lenp, loff_t *ppos) 1379 { 1380 int oval = *(int *)ctl->data; 1381 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 1382 1383 if (write) { 1384 struct mpls_dev *mdev = ctl->extra1; 1385 int i = (int *)ctl->data - (int *)mdev; 1386 struct net *net = ctl->extra2; 1387 int val = *(int *)ctl->data; 1388 1389 if (i == offsetof(struct mpls_dev, input_enabled) && 1390 val != oval) { 1391 mpls_netconf_notify_devconf(net, RTM_NEWNETCONF, 1392 NETCONFA_INPUT, mdev); 1393 } 1394 } 1395 1396 return ret; 1397 } 1398 1399 static const struct ctl_table mpls_dev_table[] = { 1400 { 1401 .procname = "input", 1402 .maxlen = sizeof(int), 1403 .mode = 0644, 1404 .proc_handler = mpls_conf_proc, 1405 .data = MPLS_PERDEV_SYSCTL_OFFSET(input_enabled), 1406 }, 1407 }; 1408 1409 static int mpls_dev_sysctl_register(struct net_device *dev, 1410 struct mpls_dev *mdev) 1411 { 1412 char path[sizeof("net/mpls/conf/") + IFNAMSIZ]; 1413 size_t table_size = ARRAY_SIZE(mpls_dev_table); 1414 struct net *net = dev_net(dev); 1415 struct ctl_table *table; 1416 int i; 1417 1418 table = kmemdup(&mpls_dev_table, sizeof(mpls_dev_table), GFP_KERNEL); 1419 if (!table) 1420 goto out; 1421 1422 /* Table data contains only offsets relative to the base of 1423 * the mdev at this point, so make them absolute. 1424 */ 1425 for (i = 0; i < table_size; i++) { 1426 table[i].data = (char *)mdev + (uintptr_t)table[i].data; 1427 table[i].extra1 = mdev; 1428 table[i].extra2 = net; 1429 } 1430 1431 snprintf(path, sizeof(path), "net/mpls/conf/%s", dev->name); 1432 1433 mdev->sysctl = register_net_sysctl_sz(net, path, table, table_size); 1434 if (!mdev->sysctl) 1435 goto free; 1436 1437 mpls_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, mdev); 1438 return 0; 1439 1440 free: 1441 kfree(table); 1442 out: 1443 mdev->sysctl = NULL; 1444 return -ENOBUFS; 1445 } 1446 1447 static void mpls_dev_sysctl_unregister(struct net_device *dev, 1448 struct mpls_dev *mdev) 1449 { 1450 struct net *net = dev_net(dev); 1451 const struct ctl_table *table; 1452 1453 if (!mdev->sysctl) 1454 return; 1455 1456 table = mdev->sysctl->ctl_table_arg; 1457 unregister_net_sysctl_table(mdev->sysctl); 1458 kfree(table); 1459 1460 mpls_netconf_notify_devconf(net, RTM_DELNETCONF, 0, mdev); 1461 } 1462 1463 static struct mpls_dev *mpls_add_dev(struct net_device *dev) 1464 { 1465 struct mpls_dev *mdev; 1466 int err = -ENOMEM; 1467 int i; 1468 1469 mdev = kzalloc_obj(*mdev); 1470 if (!mdev) 1471 return ERR_PTR(err); 1472 1473 mdev->stats = alloc_percpu(struct mpls_pcpu_stats); 1474 if (!mdev->stats) 1475 goto free; 1476 1477 for_each_possible_cpu(i) { 1478 struct mpls_pcpu_stats *mpls_stats; 1479 1480 mpls_stats = per_cpu_ptr(mdev->stats, i); 1481 u64_stats_init(&mpls_stats->syncp); 1482 } 1483 1484 mdev->dev = dev; 1485 1486 err = mpls_dev_sysctl_register(dev, mdev); 1487 if (err) 1488 goto free; 1489 1490 rcu_assign_pointer(dev->mpls_ptr, mdev); 1491 1492 return mdev; 1493 1494 free: 1495 free_percpu(mdev->stats); 1496 kfree(mdev); 1497 return ERR_PTR(err); 1498 } 1499 1500 static void mpls_dev_destroy_rcu(struct rcu_head *head) 1501 { 1502 struct mpls_dev *mdev = container_of(head, struct mpls_dev, rcu); 1503 1504 free_percpu(mdev->stats); 1505 kfree(mdev); 1506 } 1507 1508 static int mpls_ifdown(struct net_device *dev, int event) 1509 { 1510 struct net *net = dev_net(dev); 1511 unsigned int index; 1512 1513 for (index = 0; index < net->mpls.platform_labels; index++) { 1514 struct mpls_route *rt; 1515 bool nh_del = false; 1516 u8 alive = 0; 1517 1518 rt = mpls_route_input(net, index); 1519 if (!rt) 1520 continue; 1521 1522 if (event == NETDEV_UNREGISTER) { 1523 u8 deleted = 0; 1524 1525 for_nexthops(rt) { 1526 if (!nh->nh_dev || nh->nh_dev == dev) 1527 deleted++; 1528 if (nh->nh_dev == dev) 1529 nh_del = true; 1530 } endfor_nexthops(rt); 1531 1532 /* if there are no more nexthops, delete the route */ 1533 if (deleted == rt->rt_nhn) { 1534 mpls_route_update(net, index, NULL, NULL); 1535 continue; 1536 } 1537 1538 if (nh_del) { 1539 size_t size = sizeof(*rt) + rt->rt_nhn * 1540 rt->rt_nh_size; 1541 struct mpls_route *orig = rt; 1542 1543 rt = kmemdup(orig, size, GFP_KERNEL); 1544 if (!rt) 1545 return -ENOMEM; 1546 } 1547 } 1548 1549 change_nexthops(rt) { 1550 unsigned int nh_flags = nh->nh_flags; 1551 1552 if (nh->nh_dev != dev) { 1553 if (nh_del) 1554 netdev_hold(nh->nh_dev, &nh->nh_dev_tracker, 1555 GFP_KERNEL); 1556 goto next; 1557 } 1558 1559 switch (event) { 1560 case NETDEV_DOWN: 1561 case NETDEV_UNREGISTER: 1562 nh_flags |= RTNH_F_DEAD; 1563 fallthrough; 1564 case NETDEV_CHANGE: 1565 nh_flags |= RTNH_F_LINKDOWN; 1566 break; 1567 } 1568 if (event == NETDEV_UNREGISTER) 1569 nh->nh_dev = NULL; 1570 1571 if (nh->nh_flags != nh_flags) 1572 WRITE_ONCE(nh->nh_flags, nh_flags); 1573 next: 1574 if (!(nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN))) 1575 alive++; 1576 } endfor_nexthops(rt); 1577 1578 WRITE_ONCE(rt->rt_nhn_alive, alive); 1579 1580 if (nh_del) 1581 mpls_route_update(net, index, rt, NULL); 1582 } 1583 1584 return 0; 1585 } 1586 1587 static void mpls_ifup(struct net_device *dev, unsigned int flags) 1588 { 1589 struct net *net = dev_net(dev); 1590 unsigned int index; 1591 u8 alive; 1592 1593 for (index = 0; index < net->mpls.platform_labels; index++) { 1594 struct mpls_route *rt; 1595 1596 rt = mpls_route_input(net, index); 1597 if (!rt) 1598 continue; 1599 1600 alive = 0; 1601 change_nexthops(rt) { 1602 unsigned int nh_flags = nh->nh_flags; 1603 1604 if (!(nh_flags & flags)) { 1605 alive++; 1606 continue; 1607 } 1608 if (nh->nh_dev != dev) 1609 continue; 1610 alive++; 1611 nh_flags &= ~flags; 1612 WRITE_ONCE(nh->nh_flags, nh_flags); 1613 } endfor_nexthops(rt); 1614 1615 WRITE_ONCE(rt->rt_nhn_alive, alive); 1616 } 1617 } 1618 1619 static int mpls_dev_notify(struct notifier_block *this, unsigned long event, 1620 void *ptr) 1621 { 1622 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1623 struct net *net = dev_net(dev); 1624 struct mpls_dev *mdev; 1625 unsigned int flags; 1626 int err; 1627 1628 mutex_lock(&net->mpls.platform_mutex); 1629 1630 if (event == NETDEV_REGISTER) { 1631 mdev = mpls_add_dev(dev); 1632 if (IS_ERR(mdev)) { 1633 err = PTR_ERR(mdev); 1634 goto err; 1635 } 1636 1637 goto out; 1638 } 1639 1640 mdev = mpls_dev_get(net, dev); 1641 if (!mdev) 1642 goto out; 1643 1644 switch (event) { 1645 1646 case NETDEV_DOWN: 1647 err = mpls_ifdown(dev, event); 1648 if (err) 1649 goto err; 1650 break; 1651 case NETDEV_UP: 1652 flags = netif_get_flags(dev); 1653 if (flags & (IFF_RUNNING | IFF_LOWER_UP)) 1654 mpls_ifup(dev, RTNH_F_DEAD | RTNH_F_LINKDOWN); 1655 else 1656 mpls_ifup(dev, RTNH_F_DEAD); 1657 break; 1658 case NETDEV_CHANGE: 1659 flags = netif_get_flags(dev); 1660 if (flags & (IFF_RUNNING | IFF_LOWER_UP)) { 1661 mpls_ifup(dev, RTNH_F_DEAD | RTNH_F_LINKDOWN); 1662 } else { 1663 err = mpls_ifdown(dev, event); 1664 if (err) 1665 goto err; 1666 } 1667 break; 1668 case NETDEV_UNREGISTER: 1669 err = mpls_ifdown(dev, event); 1670 if (err) 1671 goto err; 1672 1673 mdev = mpls_dev_get(net, dev); 1674 if (mdev) { 1675 mpls_dev_sysctl_unregister(dev, mdev); 1676 RCU_INIT_POINTER(dev->mpls_ptr, NULL); 1677 call_rcu(&mdev->rcu, mpls_dev_destroy_rcu); 1678 } 1679 break; 1680 case NETDEV_CHANGENAME: 1681 mdev = mpls_dev_get(net, dev); 1682 if (mdev) { 1683 mpls_dev_sysctl_unregister(dev, mdev); 1684 err = mpls_dev_sysctl_register(dev, mdev); 1685 if (err) 1686 goto err; 1687 } 1688 break; 1689 } 1690 1691 out: 1692 mutex_unlock(&net->mpls.platform_mutex); 1693 return NOTIFY_OK; 1694 1695 err: 1696 mutex_unlock(&net->mpls.platform_mutex); 1697 return notifier_from_errno(err); 1698 } 1699 1700 static struct notifier_block mpls_dev_notifier = { 1701 .notifier_call = mpls_dev_notify, 1702 }; 1703 1704 static int nla_put_via(struct sk_buff *skb, 1705 u8 table, const void *addr, int alen) 1706 { 1707 static const int table_to_family[NEIGH_NR_TABLES + 1] = { 1708 AF_INET, AF_INET6, AF_PACKET, 1709 }; 1710 struct nlattr *nla; 1711 struct rtvia *via; 1712 int family = AF_UNSPEC; 1713 1714 nla = nla_reserve(skb, RTA_VIA, alen + 2); 1715 if (!nla) 1716 return -EMSGSIZE; 1717 1718 if (table <= NEIGH_NR_TABLES) 1719 family = table_to_family[table]; 1720 1721 via = nla_data(nla); 1722 via->rtvia_family = family; 1723 memcpy(via->rtvia_addr, addr, alen); 1724 return 0; 1725 } 1726 1727 int nla_put_labels(struct sk_buff *skb, int attrtype, 1728 u8 labels, const u32 label[]) 1729 { 1730 struct nlattr *nla; 1731 struct mpls_shim_hdr *nla_label; 1732 bool bos; 1733 int i; 1734 nla = nla_reserve(skb, attrtype, labels*4); 1735 if (!nla) 1736 return -EMSGSIZE; 1737 1738 nla_label = nla_data(nla); 1739 bos = true; 1740 for (i = labels - 1; i >= 0; i--) { 1741 nla_label[i] = mpls_entry_encode(label[i], 0, 0, bos); 1742 bos = false; 1743 } 1744 1745 return 0; 1746 } 1747 EXPORT_SYMBOL_GPL(nla_put_labels); 1748 1749 int nla_get_labels(const struct nlattr *nla, u8 max_labels, u8 *labels, 1750 u32 label[], struct netlink_ext_ack *extack) 1751 { 1752 unsigned len = nla_len(nla); 1753 struct mpls_shim_hdr *nla_label; 1754 u8 nla_labels; 1755 bool bos; 1756 int i; 1757 1758 /* len needs to be an even multiple of 4 (the label size). Number 1759 * of labels is a u8 so check for overflow. 1760 */ 1761 if (len & 3 || len / 4 > 255) { 1762 NL_SET_ERR_MSG_ATTR(extack, nla, 1763 "Invalid length for labels attribute"); 1764 return -EINVAL; 1765 } 1766 1767 /* Limit the number of new labels allowed */ 1768 nla_labels = len/4; 1769 if (nla_labels > max_labels) { 1770 NL_SET_ERR_MSG(extack, "Too many labels"); 1771 return -EINVAL; 1772 } 1773 1774 /* when label == NULL, caller wants number of labels */ 1775 if (!label) 1776 goto out; 1777 1778 nla_label = nla_data(nla); 1779 bos = true; 1780 for (i = nla_labels - 1; i >= 0; i--, bos = false) { 1781 struct mpls_entry_decoded dec; 1782 dec = mpls_entry_decode(nla_label + i); 1783 1784 /* Ensure the bottom of stack flag is properly set 1785 * and ttl and tc are both clear. 1786 */ 1787 if (dec.ttl) { 1788 NL_SET_ERR_MSG_ATTR(extack, nla, 1789 "TTL in label must be 0"); 1790 return -EINVAL; 1791 } 1792 1793 if (dec.tc) { 1794 NL_SET_ERR_MSG_ATTR(extack, nla, 1795 "Traffic class in label must be 0"); 1796 return -EINVAL; 1797 } 1798 1799 if (dec.bos != bos) { 1800 NL_SET_BAD_ATTR(extack, nla); 1801 if (bos) { 1802 NL_SET_ERR_MSG(extack, 1803 "BOS bit must be set in first label"); 1804 } else { 1805 NL_SET_ERR_MSG(extack, 1806 "BOS bit can only be set in first label"); 1807 } 1808 return -EINVAL; 1809 } 1810 1811 switch (dec.label) { 1812 case MPLS_LABEL_IMPLNULL: 1813 /* RFC3032: This is a label that an LSR may 1814 * assign and distribute, but which never 1815 * actually appears in the encapsulation. 1816 */ 1817 NL_SET_ERR_MSG_ATTR(extack, nla, 1818 "Implicit NULL Label (3) can not be used in encapsulation"); 1819 return -EINVAL; 1820 } 1821 1822 label[i] = dec.label; 1823 } 1824 out: 1825 *labels = nla_labels; 1826 return 0; 1827 } 1828 EXPORT_SYMBOL_GPL(nla_get_labels); 1829 1830 static int rtm_to_route_config(struct sk_buff *skb, 1831 struct nlmsghdr *nlh, 1832 struct mpls_route_config *cfg, 1833 struct netlink_ext_ack *extack) 1834 { 1835 struct rtmsg *rtm; 1836 struct nlattr *tb[RTA_MAX+1]; 1837 int index; 1838 int err; 1839 1840 err = nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX, 1841 rtm_mpls_policy, extack); 1842 if (err < 0) 1843 goto errout; 1844 1845 err = -EINVAL; 1846 rtm = nlmsg_data(nlh); 1847 1848 if (rtm->rtm_family != AF_MPLS) { 1849 NL_SET_ERR_MSG(extack, "Invalid address family in rtmsg"); 1850 goto errout; 1851 } 1852 if (rtm->rtm_dst_len != 20) { 1853 NL_SET_ERR_MSG(extack, "rtm_dst_len must be 20 for MPLS"); 1854 goto errout; 1855 } 1856 if (rtm->rtm_src_len != 0) { 1857 NL_SET_ERR_MSG(extack, "rtm_src_len must be 0 for MPLS"); 1858 goto errout; 1859 } 1860 if (rtm->rtm_tos != 0) { 1861 NL_SET_ERR_MSG(extack, "rtm_tos must be 0 for MPLS"); 1862 goto errout; 1863 } 1864 if (rtm->rtm_table != RT_TABLE_MAIN) { 1865 NL_SET_ERR_MSG(extack, 1866 "MPLS only supports the main route table"); 1867 goto errout; 1868 } 1869 /* Any value is acceptable for rtm_protocol */ 1870 1871 /* As mpls uses destination specific addresses 1872 * (or source specific address in the case of multicast) 1873 * all addresses have universal scope. 1874 */ 1875 if (rtm->rtm_scope != RT_SCOPE_UNIVERSE) { 1876 NL_SET_ERR_MSG(extack, 1877 "Invalid route scope - MPLS only supports UNIVERSE"); 1878 goto errout; 1879 } 1880 if (rtm->rtm_type != RTN_UNICAST) { 1881 NL_SET_ERR_MSG(extack, 1882 "Invalid route type - MPLS only supports UNICAST"); 1883 goto errout; 1884 } 1885 if (rtm->rtm_flags != 0) { 1886 NL_SET_ERR_MSG(extack, "rtm_flags must be 0 for MPLS"); 1887 goto errout; 1888 } 1889 1890 cfg->rc_label = LABEL_NOT_SPECIFIED; 1891 cfg->rc_protocol = rtm->rtm_protocol; 1892 cfg->rc_via_table = MPLS_NEIGH_TABLE_UNSPEC; 1893 cfg->rc_ttl_propagate = MPLS_TTL_PROP_DEFAULT; 1894 cfg->rc_nlflags = nlh->nlmsg_flags; 1895 cfg->rc_nlinfo.portid = NETLINK_CB(skb).portid; 1896 cfg->rc_nlinfo.nlh = nlh; 1897 cfg->rc_nlinfo.nl_net = sock_net(skb->sk); 1898 1899 for (index = 0; index <= RTA_MAX; index++) { 1900 struct nlattr *nla = tb[index]; 1901 if (!nla) 1902 continue; 1903 1904 switch (index) { 1905 case RTA_OIF: 1906 cfg->rc_ifindex = nla_get_u32(nla); 1907 break; 1908 case RTA_NEWDST: 1909 if (nla_get_labels(nla, MAX_NEW_LABELS, 1910 &cfg->rc_output_labels, 1911 cfg->rc_output_label, extack)) 1912 goto errout; 1913 break; 1914 case RTA_DST: 1915 { 1916 u8 label_count; 1917 if (nla_get_labels(nla, 1, &label_count, 1918 &cfg->rc_label, extack)) 1919 goto errout; 1920 1921 if (!mpls_label_ok(cfg->rc_nlinfo.nl_net, 1922 &cfg->rc_label, extack)) 1923 goto errout; 1924 break; 1925 } 1926 case RTA_GATEWAY: 1927 NL_SET_ERR_MSG(extack, "MPLS does not support RTA_GATEWAY attribute"); 1928 goto errout; 1929 case RTA_VIA: 1930 { 1931 if (nla_get_via(nla, &cfg->rc_via_alen, 1932 &cfg->rc_via_table, cfg->rc_via, 1933 extack)) 1934 goto errout; 1935 break; 1936 } 1937 case RTA_MULTIPATH: 1938 { 1939 cfg->rc_mp = nla_data(nla); 1940 cfg->rc_mp_len = nla_len(nla); 1941 break; 1942 } 1943 case RTA_TTL_PROPAGATE: 1944 { 1945 u8 ttl_propagate = nla_get_u8(nla); 1946 1947 if (ttl_propagate > 1) { 1948 NL_SET_ERR_MSG_ATTR(extack, nla, 1949 "RTA_TTL_PROPAGATE can only be 0 or 1"); 1950 goto errout; 1951 } 1952 cfg->rc_ttl_propagate = ttl_propagate ? 1953 MPLS_TTL_PROP_ENABLED : 1954 MPLS_TTL_PROP_DISABLED; 1955 break; 1956 } 1957 default: 1958 NL_SET_ERR_MSG_ATTR(extack, nla, "Unknown attribute"); 1959 /* Unsupported attribute */ 1960 goto errout; 1961 } 1962 } 1963 1964 err = 0; 1965 errout: 1966 return err; 1967 } 1968 1969 static int mpls_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, 1970 struct netlink_ext_ack *extack) 1971 { 1972 struct net *net = sock_net(skb->sk); 1973 struct mpls_route_config *cfg; 1974 int err; 1975 1976 cfg = kzalloc_obj(*cfg); 1977 if (!cfg) 1978 return -ENOMEM; 1979 1980 err = rtm_to_route_config(skb, nlh, cfg, extack); 1981 if (err < 0) 1982 goto out; 1983 1984 mutex_lock(&net->mpls.platform_mutex); 1985 err = mpls_route_del(cfg, extack); 1986 mutex_unlock(&net->mpls.platform_mutex); 1987 out: 1988 kfree(cfg); 1989 1990 return err; 1991 } 1992 1993 1994 static int mpls_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, 1995 struct netlink_ext_ack *extack) 1996 { 1997 struct net *net = sock_net(skb->sk); 1998 struct mpls_route_config *cfg; 1999 int err; 2000 2001 cfg = kzalloc_obj(*cfg); 2002 if (!cfg) 2003 return -ENOMEM; 2004 2005 err = rtm_to_route_config(skb, nlh, cfg, extack); 2006 if (err < 0) 2007 goto out; 2008 2009 mutex_lock(&net->mpls.platform_mutex); 2010 err = mpls_route_add(cfg, extack); 2011 mutex_unlock(&net->mpls.platform_mutex); 2012 out: 2013 kfree(cfg); 2014 2015 return err; 2016 } 2017 2018 static int mpls_dump_route(struct sk_buff *skb, u32 portid, u32 seq, int event, 2019 u32 label, struct mpls_route *rt, int flags) 2020 { 2021 struct net_device *dev; 2022 struct nlmsghdr *nlh; 2023 struct rtmsg *rtm; 2024 2025 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*rtm), flags); 2026 if (nlh == NULL) 2027 return -EMSGSIZE; 2028 2029 rtm = nlmsg_data(nlh); 2030 rtm->rtm_family = AF_MPLS; 2031 rtm->rtm_dst_len = 20; 2032 rtm->rtm_src_len = 0; 2033 rtm->rtm_tos = 0; 2034 rtm->rtm_table = RT_TABLE_MAIN; 2035 rtm->rtm_protocol = rt->rt_protocol; 2036 rtm->rtm_scope = RT_SCOPE_UNIVERSE; 2037 rtm->rtm_type = RTN_UNICAST; 2038 rtm->rtm_flags = 0; 2039 2040 if (nla_put_labels(skb, RTA_DST, 1, &label)) 2041 goto nla_put_failure; 2042 2043 if (rt->rt_ttl_propagate != MPLS_TTL_PROP_DEFAULT) { 2044 bool ttl_propagate = 2045 rt->rt_ttl_propagate == MPLS_TTL_PROP_ENABLED; 2046 2047 if (nla_put_u8(skb, RTA_TTL_PROPAGATE, 2048 ttl_propagate)) 2049 goto nla_put_failure; 2050 } 2051 if (rt->rt_nhn == 1) { 2052 const struct mpls_nh *nh = rt->rt_nh; 2053 2054 if (nh->nh_labels && 2055 nla_put_labels(skb, RTA_NEWDST, nh->nh_labels, 2056 nh->nh_label)) 2057 goto nla_put_failure; 2058 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC && 2059 nla_put_via(skb, nh->nh_via_table, mpls_nh_via(rt, nh), 2060 nh->nh_via_alen)) 2061 goto nla_put_failure; 2062 dev = nh->nh_dev; 2063 if (dev && nla_put_u32(skb, RTA_OIF, dev->ifindex)) 2064 goto nla_put_failure; 2065 if (nh->nh_flags & RTNH_F_LINKDOWN) 2066 rtm->rtm_flags |= RTNH_F_LINKDOWN; 2067 if (nh->nh_flags & RTNH_F_DEAD) 2068 rtm->rtm_flags |= RTNH_F_DEAD; 2069 } else { 2070 struct rtnexthop *rtnh; 2071 struct nlattr *mp; 2072 u8 linkdown = 0; 2073 u8 dead = 0; 2074 2075 mp = nla_nest_start_noflag(skb, RTA_MULTIPATH); 2076 if (!mp) 2077 goto nla_put_failure; 2078 2079 for_nexthops(rt) { 2080 dev = nh->nh_dev; 2081 if (!dev) 2082 continue; 2083 2084 rtnh = nla_reserve_nohdr(skb, sizeof(*rtnh)); 2085 if (!rtnh) 2086 goto nla_put_failure; 2087 2088 rtnh->rtnh_ifindex = dev->ifindex; 2089 if (nh->nh_flags & RTNH_F_LINKDOWN) { 2090 rtnh->rtnh_flags |= RTNH_F_LINKDOWN; 2091 linkdown++; 2092 } 2093 if (nh->nh_flags & RTNH_F_DEAD) { 2094 rtnh->rtnh_flags |= RTNH_F_DEAD; 2095 dead++; 2096 } 2097 2098 if (nh->nh_labels && nla_put_labels(skb, RTA_NEWDST, 2099 nh->nh_labels, 2100 nh->nh_label)) 2101 goto nla_put_failure; 2102 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC && 2103 nla_put_via(skb, nh->nh_via_table, 2104 mpls_nh_via(rt, nh), 2105 nh->nh_via_alen)) 2106 goto nla_put_failure; 2107 2108 /* length of rtnetlink header + attributes */ 2109 rtnh->rtnh_len = nlmsg_get_pos(skb) - (void *)rtnh; 2110 } endfor_nexthops(rt); 2111 2112 if (linkdown == rt->rt_nhn) 2113 rtm->rtm_flags |= RTNH_F_LINKDOWN; 2114 if (dead == rt->rt_nhn) 2115 rtm->rtm_flags |= RTNH_F_DEAD; 2116 2117 nla_nest_end(skb, mp); 2118 } 2119 2120 nlmsg_end(skb, nlh); 2121 return 0; 2122 2123 nla_put_failure: 2124 nlmsg_cancel(skb, nlh); 2125 return -EMSGSIZE; 2126 } 2127 2128 #if IS_ENABLED(CONFIG_INET) 2129 static int mpls_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh, 2130 struct fib_dump_filter *filter, 2131 struct netlink_callback *cb) 2132 { 2133 return ip_valid_fib_dump_req(net, nlh, filter, cb); 2134 } 2135 #else 2136 static int mpls_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh, 2137 struct fib_dump_filter *filter, 2138 struct netlink_callback *cb) 2139 { 2140 struct netlink_ext_ack *extack = cb->extack; 2141 struct nlattr *tb[RTA_MAX + 1]; 2142 struct rtmsg *rtm; 2143 int err, i; 2144 2145 rtm = nlmsg_payload(nlh, sizeof(*rtm)); 2146 if (!rtm) { 2147 NL_SET_ERR_MSG_MOD(extack, "Invalid header for FIB dump request"); 2148 return -EINVAL; 2149 } 2150 2151 if (rtm->rtm_dst_len || rtm->rtm_src_len || rtm->rtm_tos || 2152 rtm->rtm_table || rtm->rtm_scope || rtm->rtm_type || 2153 rtm->rtm_flags) { 2154 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for FIB dump request"); 2155 return -EINVAL; 2156 } 2157 2158 if (rtm->rtm_protocol) { 2159 filter->protocol = rtm->rtm_protocol; 2160 filter->filter_set = 1; 2161 cb->answer_flags = NLM_F_DUMP_FILTERED; 2162 } 2163 2164 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX, 2165 rtm_mpls_policy, extack); 2166 if (err < 0) 2167 return err; 2168 2169 for (i = 0; i <= RTA_MAX; ++i) { 2170 int ifindex; 2171 2172 if (i == RTA_OIF) { 2173 ifindex = nla_get_u32(tb[i]); 2174 filter->dev = dev_get_by_index_rcu(net, ifindex); 2175 if (!filter->dev) 2176 return -ENODEV; 2177 filter->filter_set = 1; 2178 } else if (tb[i]) { 2179 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request"); 2180 return -EINVAL; 2181 } 2182 } 2183 2184 return 0; 2185 } 2186 #endif 2187 2188 static bool mpls_rt_uses_dev(struct mpls_route *rt, 2189 const struct net_device *dev) 2190 { 2191 if (rt->rt_nhn == 1) { 2192 struct mpls_nh *nh = rt->rt_nh; 2193 2194 if (nh->nh_dev == dev) 2195 return true; 2196 } else { 2197 for_nexthops(rt) { 2198 if (nh->nh_dev == dev) 2199 return true; 2200 } endfor_nexthops(rt); 2201 } 2202 2203 return false; 2204 } 2205 2206 static int mpls_dump_routes(struct sk_buff *skb, struct netlink_callback *cb) 2207 { 2208 const struct nlmsghdr *nlh = cb->nlh; 2209 struct net *net = sock_net(skb->sk); 2210 struct mpls_route __rcu **platform_label; 2211 struct fib_dump_filter filter = { 2212 .rtnl_held = false, 2213 }; 2214 unsigned int flags = NLM_F_MULTI; 2215 size_t platform_labels; 2216 unsigned int index; 2217 int err; 2218 2219 rcu_read_lock(); 2220 2221 if (cb->strict_check) { 2222 err = mpls_valid_fib_dump_req(net, nlh, &filter, cb); 2223 if (err < 0) 2224 goto err; 2225 2226 /* for MPLS, there is only 1 table with fixed type and flags. 2227 * If either are set in the filter then return nothing. 2228 */ 2229 if ((filter.table_id && filter.table_id != RT_TABLE_MAIN) || 2230 (filter.rt_type && filter.rt_type != RTN_UNICAST) || 2231 filter.flags) 2232 goto unlock; 2233 } 2234 2235 index = cb->args[0]; 2236 if (index < MPLS_LABEL_FIRST_UNRESERVED) 2237 index = MPLS_LABEL_FIRST_UNRESERVED; 2238 2239 platform_label = rcu_dereference(net->mpls.platform_label); 2240 platform_labels = net->mpls.platform_labels; 2241 2242 if (filter.filter_set) 2243 flags |= NLM_F_DUMP_FILTERED; 2244 2245 for (; index < platform_labels; index++) { 2246 struct mpls_route *rt; 2247 2248 rt = rcu_dereference(platform_label[index]); 2249 if (!rt) 2250 continue; 2251 2252 if ((filter.dev && !mpls_rt_uses_dev(rt, filter.dev)) || 2253 (filter.protocol && rt->rt_protocol != filter.protocol)) 2254 continue; 2255 2256 if (mpls_dump_route(skb, NETLINK_CB(cb->skb).portid, 2257 cb->nlh->nlmsg_seq, RTM_NEWROUTE, 2258 index, rt, flags) < 0) 2259 break; 2260 } 2261 cb->args[0] = index; 2262 2263 unlock: 2264 rcu_read_unlock(); 2265 return skb->len; 2266 2267 err: 2268 rcu_read_unlock(); 2269 return err; 2270 } 2271 2272 static inline size_t lfib_nlmsg_size(struct mpls_route *rt) 2273 { 2274 size_t payload = 2275 NLMSG_ALIGN(sizeof(struct rtmsg)) 2276 + nla_total_size(4) /* RTA_DST */ 2277 + nla_total_size(1); /* RTA_TTL_PROPAGATE */ 2278 2279 if (rt->rt_nhn == 1) { 2280 struct mpls_nh *nh = rt->rt_nh; 2281 2282 if (nh->nh_dev) 2283 payload += nla_total_size(4); /* RTA_OIF */ 2284 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC) /* RTA_VIA */ 2285 payload += nla_total_size(2 + nh->nh_via_alen); 2286 if (nh->nh_labels) /* RTA_NEWDST */ 2287 payload += nla_total_size(nh->nh_labels * 4); 2288 } else { 2289 /* each nexthop is packed in an attribute */ 2290 size_t nhsize = 0; 2291 2292 for_nexthops(rt) { 2293 if (!nh->nh_dev) 2294 continue; 2295 nhsize += nla_total_size(sizeof(struct rtnexthop)); 2296 /* RTA_VIA */ 2297 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC) 2298 nhsize += nla_total_size(2 + nh->nh_via_alen); 2299 if (nh->nh_labels) 2300 nhsize += nla_total_size(nh->nh_labels * 4); 2301 } endfor_nexthops(rt); 2302 /* nested attribute */ 2303 payload += nla_total_size(nhsize); 2304 } 2305 2306 return payload; 2307 } 2308 2309 static void rtmsg_lfib(int event, u32 label, struct mpls_route *rt, 2310 struct nlmsghdr *nlh, struct net *net, u32 portid, 2311 unsigned int nlm_flags) 2312 { 2313 struct sk_buff *skb; 2314 u32 seq = nlh ? nlh->nlmsg_seq : 0; 2315 int err = -ENOBUFS; 2316 2317 skb = nlmsg_new(lfib_nlmsg_size(rt), GFP_KERNEL); 2318 if (skb == NULL) 2319 goto errout; 2320 2321 err = mpls_dump_route(skb, portid, seq, event, label, rt, nlm_flags); 2322 if (err < 0) { 2323 /* -EMSGSIZE implies BUG in lfib_nlmsg_size */ 2324 WARN_ON(err == -EMSGSIZE); 2325 kfree_skb(skb); 2326 goto errout; 2327 } 2328 rtnl_notify(skb, net, portid, RTNLGRP_MPLS_ROUTE, nlh, GFP_KERNEL); 2329 2330 return; 2331 errout: 2332 rtnl_set_sk_err(net, RTNLGRP_MPLS_ROUTE, err); 2333 } 2334 2335 static int mpls_valid_getroute_req(struct sk_buff *skb, 2336 const struct nlmsghdr *nlh, 2337 struct nlattr **tb, 2338 struct netlink_ext_ack *extack) 2339 { 2340 struct rtmsg *rtm; 2341 int i, err; 2342 2343 rtm = nlmsg_payload(nlh, sizeof(*rtm)); 2344 if (!rtm) { 2345 NL_SET_ERR_MSG_MOD(extack, 2346 "Invalid header for get route request"); 2347 return -EINVAL; 2348 } 2349 2350 if (!netlink_strict_get_check(skb)) 2351 return nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX, 2352 rtm_mpls_policy, extack); 2353 2354 if ((rtm->rtm_dst_len && rtm->rtm_dst_len != 20) || 2355 rtm->rtm_src_len || rtm->rtm_tos || rtm->rtm_table || 2356 rtm->rtm_protocol || rtm->rtm_scope || rtm->rtm_type) { 2357 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get route request"); 2358 return -EINVAL; 2359 } 2360 if (rtm->rtm_flags & ~RTM_F_FIB_MATCH) { 2361 NL_SET_ERR_MSG_MOD(extack, 2362 "Invalid flags for get route request"); 2363 return -EINVAL; 2364 } 2365 2366 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX, 2367 rtm_mpls_policy, extack); 2368 if (err) 2369 return err; 2370 2371 if ((tb[RTA_DST] || tb[RTA_NEWDST]) && !rtm->rtm_dst_len) { 2372 NL_SET_ERR_MSG_MOD(extack, "rtm_dst_len must be 20 for MPLS"); 2373 return -EINVAL; 2374 } 2375 2376 for (i = 0; i <= RTA_MAX; i++) { 2377 if (!tb[i]) 2378 continue; 2379 2380 switch (i) { 2381 case RTA_DST: 2382 case RTA_NEWDST: 2383 break; 2384 default: 2385 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get route request"); 2386 return -EINVAL; 2387 } 2388 } 2389 2390 return 0; 2391 } 2392 2393 static int mpls_getroute(struct sk_buff *in_skb, struct nlmsghdr *in_nlh, 2394 struct netlink_ext_ack *extack) 2395 { 2396 struct net *net = sock_net(in_skb->sk); 2397 u32 portid = NETLINK_CB(in_skb).portid; 2398 u32 in_label = LABEL_NOT_SPECIFIED; 2399 struct nlattr *tb[RTA_MAX + 1]; 2400 struct mpls_route *rt = NULL; 2401 u32 labels[MAX_NEW_LABELS]; 2402 struct mpls_shim_hdr *hdr; 2403 unsigned int hdr_size = 0; 2404 const struct mpls_nh *nh; 2405 struct net_device *dev; 2406 struct rtmsg *rtm, *r; 2407 struct nlmsghdr *nlh; 2408 struct sk_buff *skb; 2409 u8 n_labels; 2410 int err; 2411 2412 mutex_lock(&net->mpls.platform_mutex); 2413 2414 err = mpls_valid_getroute_req(in_skb, in_nlh, tb, extack); 2415 if (err < 0) 2416 goto errout; 2417 2418 rtm = nlmsg_data(in_nlh); 2419 2420 if (tb[RTA_DST]) { 2421 u8 label_count; 2422 2423 if (nla_get_labels(tb[RTA_DST], 1, &label_count, 2424 &in_label, extack)) { 2425 err = -EINVAL; 2426 goto errout; 2427 } 2428 2429 if (!mpls_label_ok(net, &in_label, extack)) { 2430 err = -EINVAL; 2431 goto errout; 2432 } 2433 } 2434 2435 if (in_label < net->mpls.platform_labels) 2436 rt = mpls_route_input(net, in_label); 2437 if (!rt) { 2438 err = -ENETUNREACH; 2439 goto errout; 2440 } 2441 2442 if (rtm->rtm_flags & RTM_F_FIB_MATCH) { 2443 skb = nlmsg_new(lfib_nlmsg_size(rt), GFP_KERNEL); 2444 if (!skb) { 2445 err = -ENOBUFS; 2446 goto errout; 2447 } 2448 2449 err = mpls_dump_route(skb, portid, in_nlh->nlmsg_seq, 2450 RTM_NEWROUTE, in_label, rt, 0); 2451 if (err < 0) { 2452 /* -EMSGSIZE implies BUG in lfib_nlmsg_size */ 2453 WARN_ON(err == -EMSGSIZE); 2454 goto errout_free; 2455 } 2456 2457 err = rtnl_unicast(skb, net, portid); 2458 goto errout; 2459 } 2460 2461 if (tb[RTA_NEWDST]) { 2462 if (nla_get_labels(tb[RTA_NEWDST], MAX_NEW_LABELS, &n_labels, 2463 labels, extack) != 0) { 2464 err = -EINVAL; 2465 goto errout; 2466 } 2467 2468 hdr_size = n_labels * sizeof(struct mpls_shim_hdr); 2469 } 2470 2471 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); 2472 if (!skb) { 2473 err = -ENOBUFS; 2474 goto errout; 2475 } 2476 2477 skb->protocol = htons(ETH_P_MPLS_UC); 2478 2479 if (hdr_size) { 2480 bool bos; 2481 int i; 2482 2483 if (skb_cow(skb, hdr_size)) { 2484 err = -ENOBUFS; 2485 goto errout_free; 2486 } 2487 2488 skb_reserve(skb, hdr_size); 2489 skb_push(skb, hdr_size); 2490 skb_reset_network_header(skb); 2491 2492 /* Push new labels */ 2493 hdr = mpls_hdr(skb); 2494 bos = true; 2495 for (i = n_labels - 1; i >= 0; i--) { 2496 hdr[i] = mpls_entry_encode(labels[i], 2497 1, 0, bos); 2498 bos = false; 2499 } 2500 } 2501 2502 nh = mpls_select_multipath(rt, skb); 2503 if (!nh) { 2504 err = -ENETUNREACH; 2505 goto errout_free; 2506 } 2507 2508 if (hdr_size) { 2509 skb_pull(skb, hdr_size); 2510 skb_reset_network_header(skb); 2511 } 2512 2513 nlh = nlmsg_put(skb, portid, in_nlh->nlmsg_seq, 2514 RTM_NEWROUTE, sizeof(*r), 0); 2515 if (!nlh) { 2516 err = -EMSGSIZE; 2517 goto errout_free; 2518 } 2519 2520 r = nlmsg_data(nlh); 2521 r->rtm_family = AF_MPLS; 2522 r->rtm_dst_len = 20; 2523 r->rtm_src_len = 0; 2524 r->rtm_table = RT_TABLE_MAIN; 2525 r->rtm_type = RTN_UNICAST; 2526 r->rtm_scope = RT_SCOPE_UNIVERSE; 2527 r->rtm_protocol = rt->rt_protocol; 2528 r->rtm_flags = 0; 2529 2530 if (nla_put_labels(skb, RTA_DST, 1, &in_label)) 2531 goto nla_put_failure; 2532 2533 if (nh->nh_labels && 2534 nla_put_labels(skb, RTA_NEWDST, nh->nh_labels, 2535 nh->nh_label)) 2536 goto nla_put_failure; 2537 2538 if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC && 2539 nla_put_via(skb, nh->nh_via_table, mpls_nh_via(rt, nh), 2540 nh->nh_via_alen)) 2541 goto nla_put_failure; 2542 dev = nh->nh_dev; 2543 if (dev && nla_put_u32(skb, RTA_OIF, dev->ifindex)) 2544 goto nla_put_failure; 2545 2546 nlmsg_end(skb, nlh); 2547 2548 err = rtnl_unicast(skb, net, portid); 2549 errout: 2550 mutex_unlock(&net->mpls.platform_mutex); 2551 return err; 2552 2553 nla_put_failure: 2554 nlmsg_cancel(skb, nlh); 2555 err = -EMSGSIZE; 2556 errout_free: 2557 mutex_unlock(&net->mpls.platform_mutex); 2558 kfree_skb(skb); 2559 return err; 2560 } 2561 2562 static int resize_platform_label_table(struct net *net, size_t limit) 2563 { 2564 size_t size = sizeof(struct mpls_route *) * limit; 2565 size_t old_limit; 2566 size_t cp_size; 2567 struct mpls_route __rcu **labels = NULL, **old; 2568 struct mpls_route *rt0 = NULL, *rt2 = NULL; 2569 unsigned index; 2570 2571 if (size) { 2572 labels = kvzalloc(size, GFP_KERNEL); 2573 if (!labels) 2574 goto nolabels; 2575 } 2576 2577 /* In case the predefined labels need to be populated */ 2578 if (limit > MPLS_LABEL_IPV4NULL) { 2579 struct net_device *lo = net->loopback_dev; 2580 2581 rt0 = mpls_rt_alloc(1, lo->addr_len, 0); 2582 if (IS_ERR(rt0)) 2583 goto nort0; 2584 2585 rt0->rt_nh->nh_dev = lo; 2586 netdev_hold(lo, &rt0->rt_nh->nh_dev_tracker, GFP_KERNEL); 2587 rt0->rt_protocol = RTPROT_KERNEL; 2588 rt0->rt_payload_type = MPT_IPV4; 2589 rt0->rt_ttl_propagate = MPLS_TTL_PROP_DEFAULT; 2590 rt0->rt_nh->nh_via_table = NEIGH_LINK_TABLE; 2591 rt0->rt_nh->nh_via_alen = lo->addr_len; 2592 memcpy(__mpls_nh_via(rt0, rt0->rt_nh), lo->dev_addr, 2593 lo->addr_len); 2594 } 2595 if (limit > MPLS_LABEL_IPV6NULL) { 2596 struct net_device *lo = net->loopback_dev; 2597 2598 rt2 = mpls_rt_alloc(1, lo->addr_len, 0); 2599 if (IS_ERR(rt2)) 2600 goto nort2; 2601 2602 rt2->rt_nh->nh_dev = lo; 2603 netdev_hold(lo, &rt2->rt_nh->nh_dev_tracker, GFP_KERNEL); 2604 rt2->rt_protocol = RTPROT_KERNEL; 2605 rt2->rt_payload_type = MPT_IPV6; 2606 rt2->rt_ttl_propagate = MPLS_TTL_PROP_DEFAULT; 2607 rt2->rt_nh->nh_via_table = NEIGH_LINK_TABLE; 2608 rt2->rt_nh->nh_via_alen = lo->addr_len; 2609 memcpy(__mpls_nh_via(rt2, rt2->rt_nh), lo->dev_addr, 2610 lo->addr_len); 2611 } 2612 2613 mutex_lock(&net->mpls.platform_mutex); 2614 2615 /* Remember the original table */ 2616 old = mpls_dereference(net, net->mpls.platform_label); 2617 old_limit = net->mpls.platform_labels; 2618 2619 /* Free any labels beyond the new table */ 2620 for (index = limit; index < old_limit; index++) 2621 mpls_route_update(net, index, NULL, NULL); 2622 2623 /* Copy over the old labels */ 2624 cp_size = size; 2625 if (old_limit < limit) 2626 cp_size = old_limit * sizeof(struct mpls_route *); 2627 2628 memcpy(labels, old, cp_size); 2629 2630 /* If needed set the predefined labels */ 2631 if ((old_limit <= MPLS_LABEL_IPV6NULL) && 2632 (limit > MPLS_LABEL_IPV6NULL)) { 2633 RCU_INIT_POINTER(labels[MPLS_LABEL_IPV6NULL], rt2); 2634 rt2 = NULL; 2635 } 2636 2637 if ((old_limit <= MPLS_LABEL_IPV4NULL) && 2638 (limit > MPLS_LABEL_IPV4NULL)) { 2639 RCU_INIT_POINTER(labels[MPLS_LABEL_IPV4NULL], rt0); 2640 rt0 = NULL; 2641 } 2642 2643 /* Update the global pointers */ 2644 net->mpls.platform_labels = limit; 2645 rcu_assign_pointer(net->mpls.platform_label, labels); 2646 2647 mutex_unlock(&net->mpls.platform_mutex); 2648 2649 mpls_rt_free(rt2); 2650 mpls_rt_free(rt0); 2651 2652 if (old) { 2653 synchronize_rcu(); 2654 kvfree(old); 2655 } 2656 return 0; 2657 2658 nort2: 2659 mpls_rt_free(rt0); 2660 nort0: 2661 kvfree(labels); 2662 nolabels: 2663 return -ENOMEM; 2664 } 2665 2666 static int mpls_platform_labels(const struct ctl_table *table, int write, 2667 void *buffer, size_t *lenp, loff_t *ppos) 2668 { 2669 struct net *net = table->data; 2670 int platform_labels = net->mpls.platform_labels; 2671 int ret; 2672 struct ctl_table tmp = { 2673 .procname = table->procname, 2674 .data = &platform_labels, 2675 .maxlen = sizeof(int), 2676 .mode = table->mode, 2677 .extra1 = SYSCTL_ZERO, 2678 .extra2 = &label_limit, 2679 }; 2680 2681 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); 2682 2683 if (write && ret == 0) 2684 ret = resize_platform_label_table(net, platform_labels); 2685 2686 return ret; 2687 } 2688 2689 #define MPLS_NS_SYSCTL_OFFSET(field) \ 2690 (&((struct net *)0)->field) 2691 2692 static const struct ctl_table mpls_table[] = { 2693 { 2694 .procname = "platform_labels", 2695 .data = NULL, 2696 .maxlen = sizeof(int), 2697 .mode = 0644, 2698 .proc_handler = mpls_platform_labels, 2699 }, 2700 { 2701 .procname = "ip_ttl_propagate", 2702 .data = MPLS_NS_SYSCTL_OFFSET(mpls.ip_ttl_propagate), 2703 .maxlen = sizeof(int), 2704 .mode = 0644, 2705 .proc_handler = proc_dointvec_minmax, 2706 .extra1 = SYSCTL_ZERO, 2707 .extra2 = SYSCTL_ONE, 2708 }, 2709 { 2710 .procname = "default_ttl", 2711 .data = MPLS_NS_SYSCTL_OFFSET(mpls.default_ttl), 2712 .maxlen = sizeof(int), 2713 .mode = 0644, 2714 .proc_handler = proc_dointvec_minmax, 2715 .extra1 = SYSCTL_ONE, 2716 .extra2 = &ttl_max, 2717 }, 2718 }; 2719 2720 static __net_init int mpls_net_init(struct net *net) 2721 { 2722 size_t table_size = ARRAY_SIZE(mpls_table); 2723 struct ctl_table *table; 2724 int i; 2725 2726 mutex_init(&net->mpls.platform_mutex); 2727 net->mpls.platform_labels = 0; 2728 net->mpls.platform_label = NULL; 2729 net->mpls.ip_ttl_propagate = 1; 2730 net->mpls.default_ttl = 255; 2731 2732 table = kmemdup(mpls_table, sizeof(mpls_table), GFP_KERNEL); 2733 if (table == NULL) 2734 return -ENOMEM; 2735 2736 /* Table data contains only offsets relative to the base of 2737 * the mdev at this point, so make them absolute. 2738 */ 2739 for (i = 0; i < table_size; i++) 2740 table[i].data = (char *)net + (uintptr_t)table[i].data; 2741 2742 net->mpls.ctl = register_net_sysctl_sz(net, "net/mpls", table, 2743 table_size); 2744 if (net->mpls.ctl == NULL) { 2745 kfree(table); 2746 return -ENOMEM; 2747 } 2748 2749 return 0; 2750 } 2751 2752 static __net_exit void mpls_net_exit(struct net *net) 2753 { 2754 struct mpls_route __rcu **platform_label; 2755 size_t platform_labels; 2756 const struct ctl_table *table; 2757 unsigned int index; 2758 2759 table = net->mpls.ctl->ctl_table_arg; 2760 unregister_net_sysctl_table(net->mpls.ctl); 2761 kfree(table); 2762 2763 /* An rcu grace period has passed since there was a device in 2764 * the network namespace (and thus the last in flight packet) 2765 * left this network namespace. This is because 2766 * unregister_netdevice_many and netdev_run_todo has completed 2767 * for each network device that was in this network namespace. 2768 * 2769 * As such no additional rcu synchronization is necessary when 2770 * freeing the platform_label table. 2771 */ 2772 mutex_lock(&net->mpls.platform_mutex); 2773 2774 platform_label = mpls_dereference(net, net->mpls.platform_label); 2775 platform_labels = net->mpls.platform_labels; 2776 2777 for (index = 0; index < platform_labels; index++) { 2778 struct mpls_route *rt; 2779 2780 rt = mpls_dereference(net, platform_label[index]); 2781 mpls_notify_route(net, index, rt, NULL, NULL); 2782 mpls_rt_free(rt); 2783 } 2784 2785 mutex_unlock(&net->mpls.platform_mutex); 2786 2787 kvfree(platform_label); 2788 } 2789 2790 static struct pernet_operations mpls_net_ops = { 2791 .init = mpls_net_init, 2792 .exit = mpls_net_exit, 2793 }; 2794 2795 static struct rtnl_af_ops mpls_af_ops __read_mostly = { 2796 .family = AF_MPLS, 2797 .fill_stats_af = mpls_fill_stats_af, 2798 .get_stats_af_size = mpls_get_stats_af_size, 2799 }; 2800 2801 static const struct rtnl_msg_handler mpls_rtnl_msg_handlers[] __initdata_or_module = { 2802 {THIS_MODULE, PF_MPLS, RTM_NEWROUTE, mpls_rtm_newroute, NULL, 2803 RTNL_FLAG_DOIT_UNLOCKED}, 2804 {THIS_MODULE, PF_MPLS, RTM_DELROUTE, mpls_rtm_delroute, NULL, 2805 RTNL_FLAG_DOIT_UNLOCKED}, 2806 {THIS_MODULE, PF_MPLS, RTM_GETROUTE, mpls_getroute, mpls_dump_routes, 2807 RTNL_FLAG_DOIT_UNLOCKED | RTNL_FLAG_DUMP_UNLOCKED}, 2808 {THIS_MODULE, PF_MPLS, RTM_GETNETCONF, 2809 mpls_netconf_get_devconf, mpls_netconf_dump_devconf, 2810 RTNL_FLAG_DOIT_UNLOCKED | RTNL_FLAG_DUMP_UNLOCKED}, 2811 }; 2812 2813 static int __init mpls_init(void) 2814 { 2815 int err; 2816 2817 BUILD_BUG_ON(sizeof(struct mpls_shim_hdr) != 4); 2818 2819 err = register_pernet_subsys(&mpls_net_ops); 2820 if (err) 2821 goto out; 2822 2823 err = register_netdevice_notifier(&mpls_dev_notifier); 2824 if (err) 2825 goto out_unregister_pernet; 2826 2827 dev_add_pack(&mpls_packet_type); 2828 2829 err = rtnl_af_register(&mpls_af_ops); 2830 if (err) 2831 goto out_unregister_dev_type; 2832 2833 err = rtnl_register_many(mpls_rtnl_msg_handlers); 2834 if (err) 2835 goto out_unregister_rtnl_af; 2836 2837 err = ipgre_tunnel_encap_add_mpls_ops(); 2838 if (err) { 2839 pr_err("Can't add mpls over gre tunnel ops\n"); 2840 goto out_unregister_rtnl; 2841 } 2842 2843 err = 0; 2844 out: 2845 return err; 2846 2847 out_unregister_rtnl: 2848 rtnl_unregister_many(mpls_rtnl_msg_handlers); 2849 out_unregister_rtnl_af: 2850 rtnl_af_unregister(&mpls_af_ops); 2851 out_unregister_dev_type: 2852 dev_remove_pack(&mpls_packet_type); 2853 unregister_netdevice_notifier(&mpls_dev_notifier); 2854 out_unregister_pernet: 2855 unregister_pernet_subsys(&mpls_net_ops); 2856 goto out; 2857 } 2858 module_init(mpls_init); 2859 2860 static void __exit mpls_exit(void) 2861 { 2862 rtnl_unregister_all(PF_MPLS); 2863 rtnl_af_unregister(&mpls_af_ops); 2864 dev_remove_pack(&mpls_packet_type); 2865 unregister_netdevice_notifier(&mpls_dev_notifier); 2866 unregister_pernet_subsys(&mpls_net_ops); 2867 ipgre_tunnel_encap_del_mpls_ops(); 2868 } 2869 module_exit(mpls_exit); 2870 2871 MODULE_DESCRIPTION("MultiProtocol Label Switching"); 2872 MODULE_LICENSE("GPL v2"); 2873 MODULE_ALIAS_NETPROTO(PF_MPLS); 2874