1 /* 2 * vrf.c: device driver to encapsulate a VRF space 3 * 4 * Copyright (c) 2015 Cumulus Networks. All rights reserved. 5 * Copyright (c) 2015 Shrijeet Mukherjee <shm@cumulusnetworks.com> 6 * Copyright (c) 2015 David Ahern <dsa@cumulusnetworks.com> 7 * 8 * Based on dummy, team and ipvlan drivers 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License as published by 12 * the Free Software Foundation; either version 2 of the License, or 13 * (at your option) any later version. 14 */ 15 16 #include <linux/module.h> 17 #include <linux/kernel.h> 18 #include <linux/netdevice.h> 19 #include <linux/etherdevice.h> 20 #include <linux/ip.h> 21 #include <linux/init.h> 22 #include <linux/moduleparam.h> 23 #include <linux/netfilter.h> 24 #include <linux/rtnetlink.h> 25 #include <net/rtnetlink.h> 26 #include <linux/u64_stats_sync.h> 27 #include <linux/hashtable.h> 28 29 #include <linux/inetdevice.h> 30 #include <net/arp.h> 31 #include <net/ip.h> 32 #include <net/ip_fib.h> 33 #include <net/ip6_fib.h> 34 #include <net/ip6_route.h> 35 #include <net/route.h> 36 #include <net/addrconf.h> 37 #include <net/l3mdev.h> 38 #include <net/fib_rules.h> 39 #include <net/netns/generic.h> 40 41 #define DRV_NAME "vrf" 42 #define DRV_VERSION "1.0" 43 44 #define FIB_RULE_PREF 1000 /* default preference for FIB rules */ 45 46 static unsigned int vrf_net_id; 47 48 struct net_vrf { 49 struct rtable __rcu *rth; 50 struct rtable __rcu *rth_local; 51 struct rt6_info __rcu *rt6; 52 struct rt6_info __rcu *rt6_local; 53 u32 tb_id; 54 }; 55 56 struct pcpu_dstats { 57 u64 tx_pkts; 58 u64 tx_bytes; 59 u64 tx_drps; 60 u64 rx_pkts; 61 u64 rx_bytes; 62 u64 rx_drps; 63 struct u64_stats_sync syncp; 64 }; 65 66 static void vrf_rx_stats(struct net_device *dev, int len) 67 { 68 struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats); 69 70 u64_stats_update_begin(&dstats->syncp); 71 dstats->rx_pkts++; 72 dstats->rx_bytes += len; 73 u64_stats_update_end(&dstats->syncp); 74 } 75 76 static void vrf_tx_error(struct net_device *vrf_dev, struct sk_buff *skb) 77 { 78 vrf_dev->stats.tx_errors++; 79 kfree_skb(skb); 80 } 81 82 static void vrf_get_stats64(struct net_device *dev, 83 struct rtnl_link_stats64 *stats) 84 { 85 int i; 86 87 for_each_possible_cpu(i) { 88 const struct pcpu_dstats *dstats; 89 u64 tbytes, tpkts, tdrops, rbytes, rpkts; 90 unsigned int start; 91 92 dstats = per_cpu_ptr(dev->dstats, i); 93 do { 94 start = u64_stats_fetch_begin_irq(&dstats->syncp); 95 tbytes = dstats->tx_bytes; 96 tpkts = dstats->tx_pkts; 97 tdrops = dstats->tx_drps; 98 rbytes = dstats->rx_bytes; 99 rpkts = dstats->rx_pkts; 100 } while (u64_stats_fetch_retry_irq(&dstats->syncp, start)); 101 stats->tx_bytes += tbytes; 102 stats->tx_packets += tpkts; 103 stats->tx_dropped += tdrops; 104 stats->rx_bytes += rbytes; 105 stats->rx_packets += rpkts; 106 } 107 } 108 109 /* by default VRF devices do not have a qdisc and are expected 110 * to be created with only a single queue. 111 */ 112 static bool qdisc_tx_is_default(const struct net_device *dev) 113 { 114 struct netdev_queue *txq; 115 struct Qdisc *qdisc; 116 117 if (dev->num_tx_queues > 1) 118 return false; 119 120 txq = netdev_get_tx_queue(dev, 0); 121 qdisc = rcu_access_pointer(txq->qdisc); 122 123 return !qdisc->enqueue; 124 } 125 126 /* Local traffic destined to local address. Reinsert the packet to rx 127 * path, similar to loopback handling. 128 */ 129 static int vrf_local_xmit(struct sk_buff *skb, struct net_device *dev, 130 struct dst_entry *dst) 131 { 132 int len = skb->len; 133 134 skb_orphan(skb); 135 136 skb_dst_set(skb, dst); 137 skb_dst_force(skb); 138 139 /* set pkt_type to avoid skb hitting packet taps twice - 140 * once on Tx and again in Rx processing 141 */ 142 skb->pkt_type = PACKET_LOOPBACK; 143 144 skb->protocol = eth_type_trans(skb, dev); 145 146 if (likely(netif_rx(skb) == NET_RX_SUCCESS)) 147 vrf_rx_stats(dev, len); 148 else 149 this_cpu_inc(dev->dstats->rx_drps); 150 151 return NETDEV_TX_OK; 152 } 153 154 #if IS_ENABLED(CONFIG_IPV6) 155 static int vrf_ip6_local_out(struct net *net, struct sock *sk, 156 struct sk_buff *skb) 157 { 158 int err; 159 160 err = nf_hook(NFPROTO_IPV6, NF_INET_LOCAL_OUT, net, 161 sk, skb, NULL, skb_dst(skb)->dev, dst_output); 162 163 if (likely(err == 1)) 164 err = dst_output(net, sk, skb); 165 166 return err; 167 } 168 169 static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb, 170 struct net_device *dev) 171 { 172 const struct ipv6hdr *iph = ipv6_hdr(skb); 173 struct net *net = dev_net(skb->dev); 174 struct flowi6 fl6 = { 175 /* needed to match OIF rule */ 176 .flowi6_oif = dev->ifindex, 177 .flowi6_iif = LOOPBACK_IFINDEX, 178 .daddr = iph->daddr, 179 .saddr = iph->saddr, 180 .flowlabel = ip6_flowinfo(iph), 181 .flowi6_mark = skb->mark, 182 .flowi6_proto = iph->nexthdr, 183 .flowi6_flags = FLOWI_FLAG_SKIP_NH_OIF, 184 }; 185 int ret = NET_XMIT_DROP; 186 struct dst_entry *dst; 187 struct dst_entry *dst_null = &net->ipv6.ip6_null_entry->dst; 188 189 dst = ip6_route_output(net, NULL, &fl6); 190 if (dst == dst_null) 191 goto err; 192 193 skb_dst_drop(skb); 194 195 /* if dst.dev is loopback or the VRF device again this is locally 196 * originated traffic destined to a local address. Short circuit 197 * to Rx path using our local dst 198 */ 199 if (dst->dev == net->loopback_dev || dst->dev == dev) { 200 struct net_vrf *vrf = netdev_priv(dev); 201 struct rt6_info *rt6_local; 202 203 /* release looked up dst and use cached local dst */ 204 dst_release(dst); 205 206 rcu_read_lock(); 207 208 rt6_local = rcu_dereference(vrf->rt6_local); 209 if (unlikely(!rt6_local)) { 210 rcu_read_unlock(); 211 goto err; 212 } 213 214 /* Ordering issue: cached local dst is created on newlink 215 * before the IPv6 initialization. Using the local dst 216 * requires rt6i_idev to be set so make sure it is. 217 */ 218 if (unlikely(!rt6_local->rt6i_idev)) { 219 rt6_local->rt6i_idev = in6_dev_get(dev); 220 if (!rt6_local->rt6i_idev) { 221 rcu_read_unlock(); 222 goto err; 223 } 224 } 225 226 dst = &rt6_local->dst; 227 dst_hold(dst); 228 229 rcu_read_unlock(); 230 231 return vrf_local_xmit(skb, dev, &rt6_local->dst); 232 } 233 234 skb_dst_set(skb, dst); 235 236 /* strip the ethernet header added for pass through VRF device */ 237 __skb_pull(skb, skb_network_offset(skb)); 238 239 ret = vrf_ip6_local_out(net, skb->sk, skb); 240 if (unlikely(net_xmit_eval(ret))) 241 dev->stats.tx_errors++; 242 else 243 ret = NET_XMIT_SUCCESS; 244 245 return ret; 246 err: 247 vrf_tx_error(dev, skb); 248 return NET_XMIT_DROP; 249 } 250 #else 251 static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb, 252 struct net_device *dev) 253 { 254 vrf_tx_error(dev, skb); 255 return NET_XMIT_DROP; 256 } 257 #endif 258 259 /* based on ip_local_out; can't use it b/c the dst is switched pointing to us */ 260 static int vrf_ip_local_out(struct net *net, struct sock *sk, 261 struct sk_buff *skb) 262 { 263 int err; 264 265 err = nf_hook(NFPROTO_IPV4, NF_INET_LOCAL_OUT, net, sk, 266 skb, NULL, skb_dst(skb)->dev, dst_output); 267 if (likely(err == 1)) 268 err = dst_output(net, sk, skb); 269 270 return err; 271 } 272 273 static netdev_tx_t vrf_process_v4_outbound(struct sk_buff *skb, 274 struct net_device *vrf_dev) 275 { 276 struct iphdr *ip4h = ip_hdr(skb); 277 int ret = NET_XMIT_DROP; 278 struct flowi4 fl4 = { 279 /* needed to match OIF rule */ 280 .flowi4_oif = vrf_dev->ifindex, 281 .flowi4_iif = LOOPBACK_IFINDEX, 282 .flowi4_tos = RT_TOS(ip4h->tos), 283 .flowi4_flags = FLOWI_FLAG_ANYSRC | FLOWI_FLAG_SKIP_NH_OIF, 284 .flowi4_proto = ip4h->protocol, 285 .daddr = ip4h->daddr, 286 .saddr = ip4h->saddr, 287 }; 288 struct net *net = dev_net(vrf_dev); 289 struct rtable *rt; 290 291 rt = ip_route_output_flow(net, &fl4, NULL); 292 if (IS_ERR(rt)) 293 goto err; 294 295 skb_dst_drop(skb); 296 297 /* if dst.dev is loopback or the VRF device again this is locally 298 * originated traffic destined to a local address. Short circuit 299 * to Rx path using our local dst 300 */ 301 if (rt->dst.dev == net->loopback_dev || rt->dst.dev == vrf_dev) { 302 struct net_vrf *vrf = netdev_priv(vrf_dev); 303 struct rtable *rth_local; 304 struct dst_entry *dst = NULL; 305 306 ip_rt_put(rt); 307 308 rcu_read_lock(); 309 310 rth_local = rcu_dereference(vrf->rth_local); 311 if (likely(rth_local)) { 312 dst = &rth_local->dst; 313 dst_hold(dst); 314 } 315 316 rcu_read_unlock(); 317 318 if (unlikely(!dst)) 319 goto err; 320 321 return vrf_local_xmit(skb, vrf_dev, dst); 322 } 323 324 skb_dst_set(skb, &rt->dst); 325 326 /* strip the ethernet header added for pass through VRF device */ 327 __skb_pull(skb, skb_network_offset(skb)); 328 329 if (!ip4h->saddr) { 330 ip4h->saddr = inet_select_addr(skb_dst(skb)->dev, 0, 331 RT_SCOPE_LINK); 332 } 333 334 ret = vrf_ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb); 335 if (unlikely(net_xmit_eval(ret))) 336 vrf_dev->stats.tx_errors++; 337 else 338 ret = NET_XMIT_SUCCESS; 339 340 out: 341 return ret; 342 err: 343 vrf_tx_error(vrf_dev, skb); 344 goto out; 345 } 346 347 static netdev_tx_t is_ip_tx_frame(struct sk_buff *skb, struct net_device *dev) 348 { 349 switch (skb->protocol) { 350 case htons(ETH_P_IP): 351 return vrf_process_v4_outbound(skb, dev); 352 case htons(ETH_P_IPV6): 353 return vrf_process_v6_outbound(skb, dev); 354 default: 355 vrf_tx_error(dev, skb); 356 return NET_XMIT_DROP; 357 } 358 } 359 360 static netdev_tx_t vrf_xmit(struct sk_buff *skb, struct net_device *dev) 361 { 362 int len = skb->len; 363 netdev_tx_t ret = is_ip_tx_frame(skb, dev); 364 365 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { 366 struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats); 367 368 u64_stats_update_begin(&dstats->syncp); 369 dstats->tx_pkts++; 370 dstats->tx_bytes += len; 371 u64_stats_update_end(&dstats->syncp); 372 } else { 373 this_cpu_inc(dev->dstats->tx_drps); 374 } 375 376 return ret; 377 } 378 379 static int vrf_finish_direct(struct net *net, struct sock *sk, 380 struct sk_buff *skb) 381 { 382 struct net_device *vrf_dev = skb->dev; 383 384 if (!list_empty(&vrf_dev->ptype_all) && 385 likely(skb_headroom(skb) >= ETH_HLEN)) { 386 struct ethhdr *eth = (struct ethhdr *)skb_push(skb, ETH_HLEN); 387 388 ether_addr_copy(eth->h_source, vrf_dev->dev_addr); 389 eth_zero_addr(eth->h_dest); 390 eth->h_proto = skb->protocol; 391 392 rcu_read_lock_bh(); 393 dev_queue_xmit_nit(skb, vrf_dev); 394 rcu_read_unlock_bh(); 395 396 skb_pull(skb, ETH_HLEN); 397 } 398 399 return 1; 400 } 401 402 #if IS_ENABLED(CONFIG_IPV6) 403 /* modelled after ip6_finish_output2 */ 404 static int vrf_finish_output6(struct net *net, struct sock *sk, 405 struct sk_buff *skb) 406 { 407 struct dst_entry *dst = skb_dst(skb); 408 struct net_device *dev = dst->dev; 409 struct neighbour *neigh; 410 struct in6_addr *nexthop; 411 int ret; 412 413 nf_reset(skb); 414 415 skb->protocol = htons(ETH_P_IPV6); 416 skb->dev = dev; 417 418 rcu_read_lock_bh(); 419 nexthop = rt6_nexthop((struct rt6_info *)dst, &ipv6_hdr(skb)->daddr); 420 neigh = __ipv6_neigh_lookup_noref(dst->dev, nexthop); 421 if (unlikely(!neigh)) 422 neigh = __neigh_create(&nd_tbl, nexthop, dst->dev, false); 423 if (!IS_ERR(neigh)) { 424 sock_confirm_neigh(skb, neigh); 425 ret = neigh_output(neigh, skb); 426 rcu_read_unlock_bh(); 427 return ret; 428 } 429 rcu_read_unlock_bh(); 430 431 IP6_INC_STATS(dev_net(dst->dev), 432 ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES); 433 kfree_skb(skb); 434 return -EINVAL; 435 } 436 437 /* modelled after ip6_output */ 438 static int vrf_output6(struct net *net, struct sock *sk, struct sk_buff *skb) 439 { 440 return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING, 441 net, sk, skb, NULL, skb_dst(skb)->dev, 442 vrf_finish_output6, 443 !(IP6CB(skb)->flags & IP6SKB_REROUTED)); 444 } 445 446 /* set dst on skb to send packet to us via dev_xmit path. Allows 447 * packet to go through device based features such as qdisc, netfilter 448 * hooks and packet sockets with skb->dev set to vrf device. 449 */ 450 static struct sk_buff *vrf_ip6_out_redirect(struct net_device *vrf_dev, 451 struct sk_buff *skb) 452 { 453 struct net_vrf *vrf = netdev_priv(vrf_dev); 454 struct dst_entry *dst = NULL; 455 struct rt6_info *rt6; 456 457 rcu_read_lock(); 458 459 rt6 = rcu_dereference(vrf->rt6); 460 if (likely(rt6)) { 461 dst = &rt6->dst; 462 dst_hold(dst); 463 } 464 465 rcu_read_unlock(); 466 467 if (unlikely(!dst)) { 468 vrf_tx_error(vrf_dev, skb); 469 return NULL; 470 } 471 472 skb_dst_drop(skb); 473 skb_dst_set(skb, dst); 474 475 return skb; 476 } 477 478 static int vrf_output6_direct(struct net *net, struct sock *sk, 479 struct sk_buff *skb) 480 { 481 skb->protocol = htons(ETH_P_IPV6); 482 483 return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING, 484 net, sk, skb, NULL, skb->dev, 485 vrf_finish_direct, 486 !(IPCB(skb)->flags & IPSKB_REROUTED)); 487 } 488 489 static struct sk_buff *vrf_ip6_out_direct(struct net_device *vrf_dev, 490 struct sock *sk, 491 struct sk_buff *skb) 492 { 493 struct net *net = dev_net(vrf_dev); 494 int err; 495 496 skb->dev = vrf_dev; 497 498 err = nf_hook(NFPROTO_IPV6, NF_INET_LOCAL_OUT, net, sk, 499 skb, NULL, vrf_dev, vrf_output6_direct); 500 501 if (likely(err == 1)) 502 err = vrf_output6_direct(net, sk, skb); 503 504 /* reset skb device */ 505 if (likely(err == 1)) 506 nf_reset(skb); 507 else 508 skb = NULL; 509 510 return skb; 511 } 512 513 static struct sk_buff *vrf_ip6_out(struct net_device *vrf_dev, 514 struct sock *sk, 515 struct sk_buff *skb) 516 { 517 /* don't divert link scope packets */ 518 if (rt6_need_strict(&ipv6_hdr(skb)->daddr)) 519 return skb; 520 521 if (qdisc_tx_is_default(vrf_dev)) 522 return vrf_ip6_out_direct(vrf_dev, sk, skb); 523 524 return vrf_ip6_out_redirect(vrf_dev, skb); 525 } 526 527 /* holding rtnl */ 528 static void vrf_rt6_release(struct net_device *dev, struct net_vrf *vrf) 529 { 530 struct rt6_info *rt6 = rtnl_dereference(vrf->rt6); 531 struct rt6_info *rt6_local = rtnl_dereference(vrf->rt6_local); 532 struct net *net = dev_net(dev); 533 struct dst_entry *dst; 534 535 RCU_INIT_POINTER(vrf->rt6, NULL); 536 RCU_INIT_POINTER(vrf->rt6_local, NULL); 537 synchronize_rcu(); 538 539 /* move dev in dst's to loopback so this VRF device can be deleted 540 * - based on dst_ifdown 541 */ 542 if (rt6) { 543 dst = &rt6->dst; 544 dev_put(dst->dev); 545 dst->dev = net->loopback_dev; 546 dev_hold(dst->dev); 547 dst_release(dst); 548 } 549 550 if (rt6_local) { 551 if (rt6_local->rt6i_idev) { 552 in6_dev_put(rt6_local->rt6i_idev); 553 rt6_local->rt6i_idev = NULL; 554 } 555 556 dst = &rt6_local->dst; 557 dev_put(dst->dev); 558 dst->dev = net->loopback_dev; 559 dev_hold(dst->dev); 560 dst_release(dst); 561 } 562 } 563 564 static int vrf_rt6_create(struct net_device *dev) 565 { 566 int flags = DST_HOST | DST_NOPOLICY | DST_NOXFRM | DST_NOCACHE; 567 struct net_vrf *vrf = netdev_priv(dev); 568 struct net *net = dev_net(dev); 569 struct fib6_table *rt6i_table; 570 struct rt6_info *rt6, *rt6_local; 571 int rc = -ENOMEM; 572 573 /* IPv6 can be CONFIG enabled and then disabled runtime */ 574 if (!ipv6_mod_enabled()) 575 return 0; 576 577 rt6i_table = fib6_new_table(net, vrf->tb_id); 578 if (!rt6i_table) 579 goto out; 580 581 /* create a dst for routing packets out a VRF device */ 582 rt6 = ip6_dst_alloc(net, dev, flags); 583 if (!rt6) 584 goto out; 585 586 dst_hold(&rt6->dst); 587 588 rt6->rt6i_table = rt6i_table; 589 rt6->dst.output = vrf_output6; 590 591 /* create a dst for local routing - packets sent locally 592 * to local address via the VRF device as a loopback 593 */ 594 rt6_local = ip6_dst_alloc(net, dev, flags); 595 if (!rt6_local) { 596 dst_release(&rt6->dst); 597 goto out; 598 } 599 600 dst_hold(&rt6_local->dst); 601 602 rt6_local->rt6i_idev = in6_dev_get(dev); 603 rt6_local->rt6i_flags = RTF_UP | RTF_NONEXTHOP | RTF_LOCAL; 604 rt6_local->rt6i_table = rt6i_table; 605 rt6_local->dst.input = ip6_input; 606 607 rcu_assign_pointer(vrf->rt6, rt6); 608 rcu_assign_pointer(vrf->rt6_local, rt6_local); 609 610 rc = 0; 611 out: 612 return rc; 613 } 614 #else 615 static struct sk_buff *vrf_ip6_out(struct net_device *vrf_dev, 616 struct sock *sk, 617 struct sk_buff *skb) 618 { 619 return skb; 620 } 621 622 static void vrf_rt6_release(struct net_device *dev, struct net_vrf *vrf) 623 { 624 } 625 626 static int vrf_rt6_create(struct net_device *dev) 627 { 628 return 0; 629 } 630 #endif 631 632 /* modelled after ip_finish_output2 */ 633 static int vrf_finish_output(struct net *net, struct sock *sk, struct sk_buff *skb) 634 { 635 struct dst_entry *dst = skb_dst(skb); 636 struct rtable *rt = (struct rtable *)dst; 637 struct net_device *dev = dst->dev; 638 unsigned int hh_len = LL_RESERVED_SPACE(dev); 639 struct neighbour *neigh; 640 u32 nexthop; 641 int ret = -EINVAL; 642 643 nf_reset(skb); 644 645 /* Be paranoid, rather than too clever. */ 646 if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) { 647 struct sk_buff *skb2; 648 649 skb2 = skb_realloc_headroom(skb, LL_RESERVED_SPACE(dev)); 650 if (!skb2) { 651 ret = -ENOMEM; 652 goto err; 653 } 654 if (skb->sk) 655 skb_set_owner_w(skb2, skb->sk); 656 657 consume_skb(skb); 658 skb = skb2; 659 } 660 661 rcu_read_lock_bh(); 662 663 nexthop = (__force u32)rt_nexthop(rt, ip_hdr(skb)->daddr); 664 neigh = __ipv4_neigh_lookup_noref(dev, nexthop); 665 if (unlikely(!neigh)) 666 neigh = __neigh_create(&arp_tbl, &nexthop, dev, false); 667 if (!IS_ERR(neigh)) { 668 sock_confirm_neigh(skb, neigh); 669 ret = neigh_output(neigh, skb); 670 } 671 672 rcu_read_unlock_bh(); 673 err: 674 if (unlikely(ret < 0)) 675 vrf_tx_error(skb->dev, skb); 676 return ret; 677 } 678 679 static int vrf_output(struct net *net, struct sock *sk, struct sk_buff *skb) 680 { 681 struct net_device *dev = skb_dst(skb)->dev; 682 683 IP_UPD_PO_STATS(net, IPSTATS_MIB_OUT, skb->len); 684 685 skb->dev = dev; 686 skb->protocol = htons(ETH_P_IP); 687 688 return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING, 689 net, sk, skb, NULL, dev, 690 vrf_finish_output, 691 !(IPCB(skb)->flags & IPSKB_REROUTED)); 692 } 693 694 /* set dst on skb to send packet to us via dev_xmit path. Allows 695 * packet to go through device based features such as qdisc, netfilter 696 * hooks and packet sockets with skb->dev set to vrf device. 697 */ 698 static struct sk_buff *vrf_ip_out_redirect(struct net_device *vrf_dev, 699 struct sk_buff *skb) 700 { 701 struct net_vrf *vrf = netdev_priv(vrf_dev); 702 struct dst_entry *dst = NULL; 703 struct rtable *rth; 704 705 rcu_read_lock(); 706 707 rth = rcu_dereference(vrf->rth); 708 if (likely(rth)) { 709 dst = &rth->dst; 710 dst_hold(dst); 711 } 712 713 rcu_read_unlock(); 714 715 if (unlikely(!dst)) { 716 vrf_tx_error(vrf_dev, skb); 717 return NULL; 718 } 719 720 skb_dst_drop(skb); 721 skb_dst_set(skb, dst); 722 723 return skb; 724 } 725 726 static int vrf_output_direct(struct net *net, struct sock *sk, 727 struct sk_buff *skb) 728 { 729 skb->protocol = htons(ETH_P_IP); 730 731 return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING, 732 net, sk, skb, NULL, skb->dev, 733 vrf_finish_direct, 734 !(IPCB(skb)->flags & IPSKB_REROUTED)); 735 } 736 737 static struct sk_buff *vrf_ip_out_direct(struct net_device *vrf_dev, 738 struct sock *sk, 739 struct sk_buff *skb) 740 { 741 struct net *net = dev_net(vrf_dev); 742 int err; 743 744 skb->dev = vrf_dev; 745 746 err = nf_hook(NFPROTO_IPV4, NF_INET_LOCAL_OUT, net, sk, 747 skb, NULL, vrf_dev, vrf_output_direct); 748 749 if (likely(err == 1)) 750 err = vrf_output_direct(net, sk, skb); 751 752 /* reset skb device */ 753 if (likely(err == 1)) 754 nf_reset(skb); 755 else 756 skb = NULL; 757 758 return skb; 759 } 760 761 static struct sk_buff *vrf_ip_out(struct net_device *vrf_dev, 762 struct sock *sk, 763 struct sk_buff *skb) 764 { 765 /* don't divert multicast */ 766 if (ipv4_is_multicast(ip_hdr(skb)->daddr)) 767 return skb; 768 769 if (qdisc_tx_is_default(vrf_dev)) 770 return vrf_ip_out_direct(vrf_dev, sk, skb); 771 772 return vrf_ip_out_redirect(vrf_dev, skb); 773 } 774 775 /* called with rcu lock held */ 776 static struct sk_buff *vrf_l3_out(struct net_device *vrf_dev, 777 struct sock *sk, 778 struct sk_buff *skb, 779 u16 proto) 780 { 781 switch (proto) { 782 case AF_INET: 783 return vrf_ip_out(vrf_dev, sk, skb); 784 case AF_INET6: 785 return vrf_ip6_out(vrf_dev, sk, skb); 786 } 787 788 return skb; 789 } 790 791 /* holding rtnl */ 792 static void vrf_rtable_release(struct net_device *dev, struct net_vrf *vrf) 793 { 794 struct rtable *rth = rtnl_dereference(vrf->rth); 795 struct rtable *rth_local = rtnl_dereference(vrf->rth_local); 796 struct net *net = dev_net(dev); 797 struct dst_entry *dst; 798 799 RCU_INIT_POINTER(vrf->rth, NULL); 800 RCU_INIT_POINTER(vrf->rth_local, NULL); 801 synchronize_rcu(); 802 803 /* move dev in dst's to loopback so this VRF device can be deleted 804 * - based on dst_ifdown 805 */ 806 if (rth) { 807 dst = &rth->dst; 808 dev_put(dst->dev); 809 dst->dev = net->loopback_dev; 810 dev_hold(dst->dev); 811 dst_release(dst); 812 } 813 814 if (rth_local) { 815 dst = &rth_local->dst; 816 dev_put(dst->dev); 817 dst->dev = net->loopback_dev; 818 dev_hold(dst->dev); 819 dst_release(dst); 820 } 821 } 822 823 static int vrf_rtable_create(struct net_device *dev) 824 { 825 struct net_vrf *vrf = netdev_priv(dev); 826 struct rtable *rth, *rth_local; 827 828 if (!fib_new_table(dev_net(dev), vrf->tb_id)) 829 return -ENOMEM; 830 831 /* create a dst for routing packets out through a VRF device */ 832 rth = rt_dst_alloc(dev, 0, RTN_UNICAST, 1, 1, 0); 833 if (!rth) 834 return -ENOMEM; 835 836 /* create a dst for local ingress routing - packets sent locally 837 * to local address via the VRF device as a loopback 838 */ 839 rth_local = rt_dst_alloc(dev, RTCF_LOCAL, RTN_LOCAL, 1, 1, 0); 840 if (!rth_local) { 841 dst_release(&rth->dst); 842 return -ENOMEM; 843 } 844 845 rth->dst.output = vrf_output; 846 rth->rt_table_id = vrf->tb_id; 847 848 rth_local->rt_table_id = vrf->tb_id; 849 850 rcu_assign_pointer(vrf->rth, rth); 851 rcu_assign_pointer(vrf->rth_local, rth_local); 852 853 return 0; 854 } 855 856 /**************************** device handling ********************/ 857 858 /* cycle interface to flush neighbor cache and move routes across tables */ 859 static void cycle_netdev(struct net_device *dev) 860 { 861 unsigned int flags = dev->flags; 862 int ret; 863 864 if (!netif_running(dev)) 865 return; 866 867 ret = dev_change_flags(dev, flags & ~IFF_UP); 868 if (ret >= 0) 869 ret = dev_change_flags(dev, flags); 870 871 if (ret < 0) { 872 netdev_err(dev, 873 "Failed to cycle device %s; route tables might be wrong!\n", 874 dev->name); 875 } 876 } 877 878 static int do_vrf_add_slave(struct net_device *dev, struct net_device *port_dev) 879 { 880 int ret; 881 882 /* do not allow loopback device to be enslaved to a VRF. 883 * The vrf device acts as the loopback for the vrf. 884 */ 885 if (port_dev == dev_net(dev)->loopback_dev) 886 return -EOPNOTSUPP; 887 888 port_dev->priv_flags |= IFF_L3MDEV_SLAVE; 889 ret = netdev_master_upper_dev_link(port_dev, dev, NULL, NULL); 890 if (ret < 0) 891 goto err; 892 893 cycle_netdev(port_dev); 894 895 return 0; 896 897 err: 898 port_dev->priv_flags &= ~IFF_L3MDEV_SLAVE; 899 return ret; 900 } 901 902 static int vrf_add_slave(struct net_device *dev, struct net_device *port_dev) 903 { 904 if (netif_is_l3_master(port_dev) || netif_is_l3_slave(port_dev)) 905 return -EINVAL; 906 907 return do_vrf_add_slave(dev, port_dev); 908 } 909 910 /* inverse of do_vrf_add_slave */ 911 static int do_vrf_del_slave(struct net_device *dev, struct net_device *port_dev) 912 { 913 netdev_upper_dev_unlink(port_dev, dev); 914 port_dev->priv_flags &= ~IFF_L3MDEV_SLAVE; 915 916 cycle_netdev(port_dev); 917 918 return 0; 919 } 920 921 static int vrf_del_slave(struct net_device *dev, struct net_device *port_dev) 922 { 923 return do_vrf_del_slave(dev, port_dev); 924 } 925 926 static void vrf_dev_uninit(struct net_device *dev) 927 { 928 struct net_vrf *vrf = netdev_priv(dev); 929 struct net_device *port_dev; 930 struct list_head *iter; 931 932 vrf_rtable_release(dev, vrf); 933 vrf_rt6_release(dev, vrf); 934 935 netdev_for_each_lower_dev(dev, port_dev, iter) 936 vrf_del_slave(dev, port_dev); 937 938 free_percpu(dev->dstats); 939 dev->dstats = NULL; 940 } 941 942 static int vrf_dev_init(struct net_device *dev) 943 { 944 struct net_vrf *vrf = netdev_priv(dev); 945 946 dev->dstats = netdev_alloc_pcpu_stats(struct pcpu_dstats); 947 if (!dev->dstats) 948 goto out_nomem; 949 950 /* create the default dst which points back to us */ 951 if (vrf_rtable_create(dev) != 0) 952 goto out_stats; 953 954 if (vrf_rt6_create(dev) != 0) 955 goto out_rth; 956 957 dev->flags = IFF_MASTER | IFF_NOARP; 958 959 /* MTU is irrelevant for VRF device; set to 64k similar to lo */ 960 dev->mtu = 64 * 1024; 961 962 /* similarly, oper state is irrelevant; set to up to avoid confusion */ 963 dev->operstate = IF_OPER_UP; 964 netdev_lockdep_set_classes(dev); 965 return 0; 966 967 out_rth: 968 vrf_rtable_release(dev, vrf); 969 out_stats: 970 free_percpu(dev->dstats); 971 dev->dstats = NULL; 972 out_nomem: 973 return -ENOMEM; 974 } 975 976 static const struct net_device_ops vrf_netdev_ops = { 977 .ndo_init = vrf_dev_init, 978 .ndo_uninit = vrf_dev_uninit, 979 .ndo_start_xmit = vrf_xmit, 980 .ndo_get_stats64 = vrf_get_stats64, 981 .ndo_add_slave = vrf_add_slave, 982 .ndo_del_slave = vrf_del_slave, 983 }; 984 985 static u32 vrf_fib_table(const struct net_device *dev) 986 { 987 struct net_vrf *vrf = netdev_priv(dev); 988 989 return vrf->tb_id; 990 } 991 992 static int vrf_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb) 993 { 994 kfree_skb(skb); 995 return 0; 996 } 997 998 static struct sk_buff *vrf_rcv_nfhook(u8 pf, unsigned int hook, 999 struct sk_buff *skb, 1000 struct net_device *dev) 1001 { 1002 struct net *net = dev_net(dev); 1003 1004 if (nf_hook(pf, hook, net, NULL, skb, dev, NULL, vrf_rcv_finish) != 1) 1005 skb = NULL; /* kfree_skb(skb) handled by nf code */ 1006 1007 return skb; 1008 } 1009 1010 #if IS_ENABLED(CONFIG_IPV6) 1011 /* neighbor handling is done with actual device; do not want 1012 * to flip skb->dev for those ndisc packets. This really fails 1013 * for multiple next protocols (e.g., NEXTHDR_HOP). But it is 1014 * a start. 1015 */ 1016 static bool ipv6_ndisc_frame(const struct sk_buff *skb) 1017 { 1018 const struct ipv6hdr *iph = ipv6_hdr(skb); 1019 bool rc = false; 1020 1021 if (iph->nexthdr == NEXTHDR_ICMP) { 1022 const struct icmp6hdr *icmph; 1023 struct icmp6hdr _icmph; 1024 1025 icmph = skb_header_pointer(skb, sizeof(*iph), 1026 sizeof(_icmph), &_icmph); 1027 if (!icmph) 1028 goto out; 1029 1030 switch (icmph->icmp6_type) { 1031 case NDISC_ROUTER_SOLICITATION: 1032 case NDISC_ROUTER_ADVERTISEMENT: 1033 case NDISC_NEIGHBOUR_SOLICITATION: 1034 case NDISC_NEIGHBOUR_ADVERTISEMENT: 1035 case NDISC_REDIRECT: 1036 rc = true; 1037 break; 1038 } 1039 } 1040 1041 out: 1042 return rc; 1043 } 1044 1045 static struct rt6_info *vrf_ip6_route_lookup(struct net *net, 1046 const struct net_device *dev, 1047 struct flowi6 *fl6, 1048 int ifindex, 1049 int flags) 1050 { 1051 struct net_vrf *vrf = netdev_priv(dev); 1052 struct fib6_table *table = NULL; 1053 struct rt6_info *rt6; 1054 1055 rcu_read_lock(); 1056 1057 /* fib6_table does not have a refcnt and can not be freed */ 1058 rt6 = rcu_dereference(vrf->rt6); 1059 if (likely(rt6)) 1060 table = rt6->rt6i_table; 1061 1062 rcu_read_unlock(); 1063 1064 if (!table) 1065 return NULL; 1066 1067 return ip6_pol_route(net, table, ifindex, fl6, flags); 1068 } 1069 1070 static void vrf_ip6_input_dst(struct sk_buff *skb, struct net_device *vrf_dev, 1071 int ifindex) 1072 { 1073 const struct ipv6hdr *iph = ipv6_hdr(skb); 1074 struct flowi6 fl6 = { 1075 .daddr = iph->daddr, 1076 .saddr = iph->saddr, 1077 .flowlabel = ip6_flowinfo(iph), 1078 .flowi6_mark = skb->mark, 1079 .flowi6_proto = iph->nexthdr, 1080 .flowi6_iif = ifindex, 1081 }; 1082 struct net *net = dev_net(vrf_dev); 1083 struct rt6_info *rt6; 1084 1085 rt6 = vrf_ip6_route_lookup(net, vrf_dev, &fl6, ifindex, 1086 RT6_LOOKUP_F_HAS_SADDR | RT6_LOOKUP_F_IFACE); 1087 if (unlikely(!rt6)) 1088 return; 1089 1090 if (unlikely(&rt6->dst == &net->ipv6.ip6_null_entry->dst)) 1091 return; 1092 1093 skb_dst_set(skb, &rt6->dst); 1094 } 1095 1096 static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev, 1097 struct sk_buff *skb) 1098 { 1099 int orig_iif = skb->skb_iif; 1100 bool need_strict; 1101 1102 /* loopback traffic; do not push through packet taps again. 1103 * Reset pkt_type for upper layers to process skb 1104 */ 1105 if (skb->pkt_type == PACKET_LOOPBACK) { 1106 skb->dev = vrf_dev; 1107 skb->skb_iif = vrf_dev->ifindex; 1108 IP6CB(skb)->flags |= IP6SKB_L3SLAVE; 1109 skb->pkt_type = PACKET_HOST; 1110 goto out; 1111 } 1112 1113 /* if packet is NDISC or addressed to multicast or link-local 1114 * then keep the ingress interface 1115 */ 1116 need_strict = rt6_need_strict(&ipv6_hdr(skb)->daddr); 1117 if (!ipv6_ndisc_frame(skb) && !need_strict) { 1118 vrf_rx_stats(vrf_dev, skb->len); 1119 skb->dev = vrf_dev; 1120 skb->skb_iif = vrf_dev->ifindex; 1121 1122 if (!list_empty(&vrf_dev->ptype_all)) { 1123 skb_push(skb, skb->mac_len); 1124 dev_queue_xmit_nit(skb, vrf_dev); 1125 skb_pull(skb, skb->mac_len); 1126 } 1127 1128 IP6CB(skb)->flags |= IP6SKB_L3SLAVE; 1129 } 1130 1131 if (need_strict) 1132 vrf_ip6_input_dst(skb, vrf_dev, orig_iif); 1133 1134 skb = vrf_rcv_nfhook(NFPROTO_IPV6, NF_INET_PRE_ROUTING, skb, vrf_dev); 1135 out: 1136 return skb; 1137 } 1138 1139 #else 1140 static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev, 1141 struct sk_buff *skb) 1142 { 1143 return skb; 1144 } 1145 #endif 1146 1147 static struct sk_buff *vrf_ip_rcv(struct net_device *vrf_dev, 1148 struct sk_buff *skb) 1149 { 1150 skb->dev = vrf_dev; 1151 skb->skb_iif = vrf_dev->ifindex; 1152 IPCB(skb)->flags |= IPSKB_L3SLAVE; 1153 1154 if (ipv4_is_multicast(ip_hdr(skb)->daddr)) 1155 goto out; 1156 1157 /* loopback traffic; do not push through packet taps again. 1158 * Reset pkt_type for upper layers to process skb 1159 */ 1160 if (skb->pkt_type == PACKET_LOOPBACK) { 1161 skb->pkt_type = PACKET_HOST; 1162 goto out; 1163 } 1164 1165 vrf_rx_stats(vrf_dev, skb->len); 1166 1167 if (!list_empty(&vrf_dev->ptype_all)) { 1168 skb_push(skb, skb->mac_len); 1169 dev_queue_xmit_nit(skb, vrf_dev); 1170 skb_pull(skb, skb->mac_len); 1171 } 1172 1173 skb = vrf_rcv_nfhook(NFPROTO_IPV4, NF_INET_PRE_ROUTING, skb, vrf_dev); 1174 out: 1175 return skb; 1176 } 1177 1178 /* called with rcu lock held */ 1179 static struct sk_buff *vrf_l3_rcv(struct net_device *vrf_dev, 1180 struct sk_buff *skb, 1181 u16 proto) 1182 { 1183 switch (proto) { 1184 case AF_INET: 1185 return vrf_ip_rcv(vrf_dev, skb); 1186 case AF_INET6: 1187 return vrf_ip6_rcv(vrf_dev, skb); 1188 } 1189 1190 return skb; 1191 } 1192 1193 #if IS_ENABLED(CONFIG_IPV6) 1194 /* send to link-local or multicast address via interface enslaved to 1195 * VRF device. Force lookup to VRF table without changing flow struct 1196 */ 1197 static struct dst_entry *vrf_link_scope_lookup(const struct net_device *dev, 1198 struct flowi6 *fl6) 1199 { 1200 struct net *net = dev_net(dev); 1201 int flags = RT6_LOOKUP_F_IFACE; 1202 struct dst_entry *dst = NULL; 1203 struct rt6_info *rt; 1204 1205 /* VRF device does not have a link-local address and 1206 * sending packets to link-local or mcast addresses over 1207 * a VRF device does not make sense 1208 */ 1209 if (fl6->flowi6_oif == dev->ifindex) { 1210 dst = &net->ipv6.ip6_null_entry->dst; 1211 dst_hold(dst); 1212 return dst; 1213 } 1214 1215 if (!ipv6_addr_any(&fl6->saddr)) 1216 flags |= RT6_LOOKUP_F_HAS_SADDR; 1217 1218 rt = vrf_ip6_route_lookup(net, dev, fl6, fl6->flowi6_oif, flags); 1219 if (rt) 1220 dst = &rt->dst; 1221 1222 return dst; 1223 } 1224 #endif 1225 1226 static const struct l3mdev_ops vrf_l3mdev_ops = { 1227 .l3mdev_fib_table = vrf_fib_table, 1228 .l3mdev_l3_rcv = vrf_l3_rcv, 1229 .l3mdev_l3_out = vrf_l3_out, 1230 #if IS_ENABLED(CONFIG_IPV6) 1231 .l3mdev_link_scope_lookup = vrf_link_scope_lookup, 1232 #endif 1233 }; 1234 1235 static void vrf_get_drvinfo(struct net_device *dev, 1236 struct ethtool_drvinfo *info) 1237 { 1238 strlcpy(info->driver, DRV_NAME, sizeof(info->driver)); 1239 strlcpy(info->version, DRV_VERSION, sizeof(info->version)); 1240 } 1241 1242 static const struct ethtool_ops vrf_ethtool_ops = { 1243 .get_drvinfo = vrf_get_drvinfo, 1244 }; 1245 1246 static inline size_t vrf_fib_rule_nl_size(void) 1247 { 1248 size_t sz; 1249 1250 sz = NLMSG_ALIGN(sizeof(struct fib_rule_hdr)); 1251 sz += nla_total_size(sizeof(u8)); /* FRA_L3MDEV */ 1252 sz += nla_total_size(sizeof(u32)); /* FRA_PRIORITY */ 1253 1254 return sz; 1255 } 1256 1257 static int vrf_fib_rule(const struct net_device *dev, __u8 family, bool add_it) 1258 { 1259 struct fib_rule_hdr *frh; 1260 struct nlmsghdr *nlh; 1261 struct sk_buff *skb; 1262 int err; 1263 1264 if (family == AF_INET6 && !ipv6_mod_enabled()) 1265 return 0; 1266 1267 skb = nlmsg_new(vrf_fib_rule_nl_size(), GFP_KERNEL); 1268 if (!skb) 1269 return -ENOMEM; 1270 1271 nlh = nlmsg_put(skb, 0, 0, 0, sizeof(*frh), 0); 1272 if (!nlh) 1273 goto nla_put_failure; 1274 1275 /* rule only needs to appear once */ 1276 nlh->nlmsg_flags |= NLM_F_EXCL; 1277 1278 frh = nlmsg_data(nlh); 1279 memset(frh, 0, sizeof(*frh)); 1280 frh->family = family; 1281 frh->action = FR_ACT_TO_TBL; 1282 1283 if (nla_put_u32(skb, FRA_L3MDEV, 1)) 1284 goto nla_put_failure; 1285 1286 if (nla_put_u32(skb, FRA_PRIORITY, FIB_RULE_PREF)) 1287 goto nla_put_failure; 1288 1289 nlmsg_end(skb, nlh); 1290 1291 /* fib_nl_{new,del}rule handling looks for net from skb->sk */ 1292 skb->sk = dev_net(dev)->rtnl; 1293 if (add_it) { 1294 err = fib_nl_newrule(skb, nlh, NULL); 1295 if (err == -EEXIST) 1296 err = 0; 1297 } else { 1298 err = fib_nl_delrule(skb, nlh, NULL); 1299 if (err == -ENOENT) 1300 err = 0; 1301 } 1302 nlmsg_free(skb); 1303 1304 return err; 1305 1306 nla_put_failure: 1307 nlmsg_free(skb); 1308 1309 return -EMSGSIZE; 1310 } 1311 1312 static int vrf_add_fib_rules(const struct net_device *dev) 1313 { 1314 int err; 1315 1316 err = vrf_fib_rule(dev, AF_INET, true); 1317 if (err < 0) 1318 goto out_err; 1319 1320 err = vrf_fib_rule(dev, AF_INET6, true); 1321 if (err < 0) 1322 goto ipv6_err; 1323 1324 #if IS_ENABLED(CONFIG_IP_MROUTE_MULTIPLE_TABLES) 1325 err = vrf_fib_rule(dev, RTNL_FAMILY_IPMR, true); 1326 if (err < 0) 1327 goto ipmr_err; 1328 #endif 1329 1330 return 0; 1331 1332 #if IS_ENABLED(CONFIG_IP_MROUTE_MULTIPLE_TABLES) 1333 ipmr_err: 1334 vrf_fib_rule(dev, AF_INET6, false); 1335 #endif 1336 1337 ipv6_err: 1338 vrf_fib_rule(dev, AF_INET, false); 1339 1340 out_err: 1341 netdev_err(dev, "Failed to add FIB rules.\n"); 1342 return err; 1343 } 1344 1345 static void vrf_setup(struct net_device *dev) 1346 { 1347 ether_setup(dev); 1348 1349 /* Initialize the device structure. */ 1350 dev->netdev_ops = &vrf_netdev_ops; 1351 dev->l3mdev_ops = &vrf_l3mdev_ops; 1352 dev->ethtool_ops = &vrf_ethtool_ops; 1353 dev->needs_free_netdev = true; 1354 1355 /* Fill in device structure with ethernet-generic values. */ 1356 eth_hw_addr_random(dev); 1357 1358 /* don't acquire vrf device's netif_tx_lock when transmitting */ 1359 dev->features |= NETIF_F_LLTX; 1360 1361 /* don't allow vrf devices to change network namespaces. */ 1362 dev->features |= NETIF_F_NETNS_LOCAL; 1363 1364 /* does not make sense for a VLAN to be added to a vrf device */ 1365 dev->features |= NETIF_F_VLAN_CHALLENGED; 1366 1367 /* enable offload features */ 1368 dev->features |= NETIF_F_GSO_SOFTWARE; 1369 dev->features |= NETIF_F_RXCSUM | NETIF_F_HW_CSUM; 1370 dev->features |= NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA; 1371 1372 dev->hw_features = dev->features; 1373 dev->hw_enc_features = dev->features; 1374 1375 /* default to no qdisc; user can add if desired */ 1376 dev->priv_flags |= IFF_NO_QUEUE; 1377 } 1378 1379 static int vrf_validate(struct nlattr *tb[], struct nlattr *data[]) 1380 { 1381 if (tb[IFLA_ADDRESS]) { 1382 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 1383 return -EINVAL; 1384 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 1385 return -EADDRNOTAVAIL; 1386 } 1387 return 0; 1388 } 1389 1390 static void vrf_dellink(struct net_device *dev, struct list_head *head) 1391 { 1392 unregister_netdevice_queue(dev, head); 1393 } 1394 1395 static int vrf_newlink(struct net *src_net, struct net_device *dev, 1396 struct nlattr *tb[], struct nlattr *data[]) 1397 { 1398 struct net_vrf *vrf = netdev_priv(dev); 1399 bool *add_fib_rules; 1400 struct net *net; 1401 int err; 1402 1403 if (!data || !data[IFLA_VRF_TABLE]) 1404 return -EINVAL; 1405 1406 vrf->tb_id = nla_get_u32(data[IFLA_VRF_TABLE]); 1407 if (vrf->tb_id == RT_TABLE_UNSPEC) 1408 return -EINVAL; 1409 1410 dev->priv_flags |= IFF_L3MDEV_MASTER; 1411 1412 err = register_netdevice(dev); 1413 if (err) 1414 goto out; 1415 1416 net = dev_net(dev); 1417 add_fib_rules = net_generic(net, vrf_net_id); 1418 if (*add_fib_rules) { 1419 err = vrf_add_fib_rules(dev); 1420 if (err) { 1421 unregister_netdevice(dev); 1422 goto out; 1423 } 1424 *add_fib_rules = false; 1425 } 1426 1427 out: 1428 return err; 1429 } 1430 1431 static size_t vrf_nl_getsize(const struct net_device *dev) 1432 { 1433 return nla_total_size(sizeof(u32)); /* IFLA_VRF_TABLE */ 1434 } 1435 1436 static int vrf_fillinfo(struct sk_buff *skb, 1437 const struct net_device *dev) 1438 { 1439 struct net_vrf *vrf = netdev_priv(dev); 1440 1441 return nla_put_u32(skb, IFLA_VRF_TABLE, vrf->tb_id); 1442 } 1443 1444 static size_t vrf_get_slave_size(const struct net_device *bond_dev, 1445 const struct net_device *slave_dev) 1446 { 1447 return nla_total_size(sizeof(u32)); /* IFLA_VRF_PORT_TABLE */ 1448 } 1449 1450 static int vrf_fill_slave_info(struct sk_buff *skb, 1451 const struct net_device *vrf_dev, 1452 const struct net_device *slave_dev) 1453 { 1454 struct net_vrf *vrf = netdev_priv(vrf_dev); 1455 1456 if (nla_put_u32(skb, IFLA_VRF_PORT_TABLE, vrf->tb_id)) 1457 return -EMSGSIZE; 1458 1459 return 0; 1460 } 1461 1462 static const struct nla_policy vrf_nl_policy[IFLA_VRF_MAX + 1] = { 1463 [IFLA_VRF_TABLE] = { .type = NLA_U32 }, 1464 }; 1465 1466 static struct rtnl_link_ops vrf_link_ops __read_mostly = { 1467 .kind = DRV_NAME, 1468 .priv_size = sizeof(struct net_vrf), 1469 1470 .get_size = vrf_nl_getsize, 1471 .policy = vrf_nl_policy, 1472 .validate = vrf_validate, 1473 .fill_info = vrf_fillinfo, 1474 1475 .get_slave_size = vrf_get_slave_size, 1476 .fill_slave_info = vrf_fill_slave_info, 1477 1478 .newlink = vrf_newlink, 1479 .dellink = vrf_dellink, 1480 .setup = vrf_setup, 1481 .maxtype = IFLA_VRF_MAX, 1482 }; 1483 1484 static int vrf_device_event(struct notifier_block *unused, 1485 unsigned long event, void *ptr) 1486 { 1487 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1488 1489 /* only care about unregister events to drop slave references */ 1490 if (event == NETDEV_UNREGISTER) { 1491 struct net_device *vrf_dev; 1492 1493 if (!netif_is_l3_slave(dev)) 1494 goto out; 1495 1496 vrf_dev = netdev_master_upper_dev_get(dev); 1497 vrf_del_slave(vrf_dev, dev); 1498 } 1499 out: 1500 return NOTIFY_DONE; 1501 } 1502 1503 static struct notifier_block vrf_notifier_block __read_mostly = { 1504 .notifier_call = vrf_device_event, 1505 }; 1506 1507 /* Initialize per network namespace state */ 1508 static int __net_init vrf_netns_init(struct net *net) 1509 { 1510 bool *add_fib_rules = net_generic(net, vrf_net_id); 1511 1512 *add_fib_rules = true; 1513 1514 return 0; 1515 } 1516 1517 static struct pernet_operations vrf_net_ops __net_initdata = { 1518 .init = vrf_netns_init, 1519 .id = &vrf_net_id, 1520 .size = sizeof(bool), 1521 }; 1522 1523 static int __init vrf_init_module(void) 1524 { 1525 int rc; 1526 1527 register_netdevice_notifier(&vrf_notifier_block); 1528 1529 rc = register_pernet_subsys(&vrf_net_ops); 1530 if (rc < 0) 1531 goto error; 1532 1533 rc = rtnl_link_register(&vrf_link_ops); 1534 if (rc < 0) { 1535 unregister_pernet_subsys(&vrf_net_ops); 1536 goto error; 1537 } 1538 1539 return 0; 1540 1541 error: 1542 unregister_netdevice_notifier(&vrf_notifier_block); 1543 return rc; 1544 } 1545 1546 module_init(vrf_init_module); 1547 MODULE_AUTHOR("Shrijeet Mukherjee, David Ahern"); 1548 MODULE_DESCRIPTION("Device driver to instantiate VRF domains"); 1549 MODULE_LICENSE("GPL"); 1550 MODULE_ALIAS_RTNL_LINK(DRV_NAME); 1551 MODULE_VERSION(DRV_VERSION); 1552