| 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
| 2 | /* |
| 3 | * vrf.c: device driver to encapsulate a VRF space |
| 4 | * |
| 5 | * Copyright (c) 2015 Cumulus Networks. All rights reserved. |
| 6 | * Copyright (c) 2015 Shrijeet Mukherjee <shm@cumulusnetworks.com> |
| 7 | * Copyright (c) 2015 David Ahern <dsa@cumulusnetworks.com> |
| 8 | * |
| 9 | * Based on dummy, team and ipvlan drivers |
| 10 | */ |
| 11 | |
| 12 | #include <linux/ethtool.h> |
| 13 | #include <linux/module.h> |
| 14 | #include <linux/kernel.h> |
| 15 | #include <linux/netdevice.h> |
| 16 | #include <linux/etherdevice.h> |
| 17 | #include <linux/ip.h> |
| 18 | #include <linux/init.h> |
| 19 | #include <linux/moduleparam.h> |
| 20 | #include <linux/netfilter.h> |
| 21 | #include <linux/rtnetlink.h> |
| 22 | #include <net/rtnetlink.h> |
| 23 | #include <linux/u64_stats_sync.h> |
| 24 | #include <linux/hashtable.h> |
| 25 | #include <linux/spinlock_types.h> |
| 26 | |
| 27 | #include <linux/inetdevice.h> |
| 28 | #include <net/arp.h> |
| 29 | #include <net/ip.h> |
| 30 | #include <net/ip_fib.h> |
| 31 | #include <net/ip6_fib.h> |
| 32 | #include <net/ip6_route.h> |
| 33 | #include <net/route.h> |
| 34 | #include <net/addrconf.h> |
| 35 | #include <net/l3mdev.h> |
| 36 | #include <net/fib_rules.h> |
| 37 | #include <net/netns/generic.h> |
| 38 | |
| 39 | #define DRV_NAME "vrf" |
| 40 | #define DRV_VERSION "1.1" |
| 41 | |
| 42 | #define FIB_RULE_PREF 1000 /* default preference for FIB rules */ |
| 43 | |
| 44 | #define HT_MAP_BITS 4 |
| 45 | #define HASH_INITVAL ((u32)0xcafef00d) |
| 46 | |
| 47 | struct vrf_map { |
| 48 | DECLARE_HASHTABLE(ht, HT_MAP_BITS); |
| 49 | spinlock_t vmap_lock; |
| 50 | |
| 51 | /* shared_tables: |
| 52 | * count how many distinct tables do not comply with the strict mode |
| 53 | * requirement. |
| 54 | * shared_tables value must be 0 in order to enable the strict mode. |
| 55 | * |
| 56 | * example of the evolution of shared_tables: |
| 57 | * | time |
| 58 | * add vrf0 --> table 100 shared_tables = 0 | t0 |
| 59 | * add vrf1 --> table 101 shared_tables = 0 | t1 |
| 60 | * add vrf2 --> table 100 shared_tables = 1 | t2 |
| 61 | * add vrf3 --> table 100 shared_tables = 1 | t3 |
| 62 | * add vrf4 --> table 101 shared_tables = 2 v t4 |
| 63 | * |
| 64 | * shared_tables is a "step function" (or "staircase function") |
| 65 | * and it is increased by one when the second vrf is associated to a |
| 66 | * table. |
| 67 | * |
| 68 | * at t2, vrf0 and vrf2 are bound to table 100: shared_tables = 1. |
| 69 | * |
| 70 | * at t3, another dev (vrf3) is bound to the same table 100 but the |
| 71 | * value of shared_tables is still 1. |
| 72 | * This means that no matter how many new vrfs will register on the |
| 73 | * table 100, the shared_tables will not increase (considering only |
| 74 | * table 100). |
| 75 | * |
| 76 | * at t4, vrf4 is bound to table 101, and shared_tables = 2. |
| 77 | * |
| 78 | * Looking at the value of shared_tables we can immediately know if |
| 79 | * the strict_mode can or cannot be enforced. Indeed, strict_mode |
| 80 | * can be enforced iff shared_tables = 0. |
| 81 | * |
| 82 | * Conversely, shared_tables is decreased when a vrf is de-associated |
| 83 | * from a table with exactly two associated vrfs. |
| 84 | */ |
| 85 | u32 shared_tables; |
| 86 | |
| 87 | bool strict_mode; |
| 88 | }; |
| 89 | |
| 90 | struct vrf_map_elem { |
| 91 | struct hlist_node hnode; |
| 92 | struct list_head vrf_list; /* VRFs registered to this table */ |
| 93 | |
| 94 | u32 table_id; |
| 95 | int users; |
| 96 | int ifindex; |
| 97 | }; |
| 98 | |
| 99 | static unsigned int vrf_net_id; |
| 100 | |
| 101 | /* per netns vrf data */ |
| 102 | struct netns_vrf { |
| 103 | /* protected by rtnl lock */ |
| 104 | bool add_fib_rules; |
| 105 | |
| 106 | struct vrf_map vmap; |
| 107 | struct ctl_table_header *ctl_hdr; |
| 108 | }; |
| 109 | |
| 110 | struct net_vrf { |
| 111 | struct rtable __rcu *rth; |
| 112 | struct rt6_info __rcu *rt6; |
| 113 | #if IS_ENABLED(CONFIG_IPV6) |
| 114 | struct fib6_table *fib6_table; |
| 115 | #endif |
| 116 | u32 tb_id; |
| 117 | |
| 118 | struct list_head me_list; /* entry in vrf_map_elem */ |
| 119 | int ifindex; |
| 120 | }; |
| 121 | |
| 122 | struct pcpu_dstats { |
| 123 | u64 tx_pkts; |
| 124 | u64 tx_bytes; |
| 125 | u64 tx_drps; |
| 126 | u64 rx_pkts; |
| 127 | u64 rx_bytes; |
| 128 | u64 rx_drps; |
| 129 | struct u64_stats_sync syncp; |
| 130 | }; |
| 131 | |
| 132 | static void vrf_rx_stats(struct net_device *dev, int len) |
| 133 | { |
| 134 | struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats); |
| 135 | |
| 136 | u64_stats_update_begin(&dstats->syncp); |
| 137 | dstats->rx_pkts++; |
| 138 | dstats->rx_bytes += len; |
| 139 | u64_stats_update_end(&dstats->syncp); |
| 140 | } |
| 141 | |
| 142 | static void vrf_tx_error(struct net_device *vrf_dev, struct sk_buff *skb) |
| 143 | { |
| 144 | vrf_dev->stats.tx_errors++; |
| 145 | kfree_skb(skb); |
| 146 | } |
| 147 | |
| 148 | static void vrf_get_stats64(struct net_device *dev, |
| 149 | struct rtnl_link_stats64 *stats) |
| 150 | { |
| 151 | int i; |
| 152 | |
| 153 | for_each_possible_cpu(i) { |
| 154 | const struct pcpu_dstats *dstats; |
| 155 | u64 tbytes, tpkts, tdrops, rbytes, rpkts; |
| 156 | unsigned int start; |
| 157 | |
| 158 | dstats = per_cpu_ptr(dev->dstats, i); |
| 159 | do { |
| 160 | start = u64_stats_fetch_begin_irq(&dstats->syncp); |
| 161 | tbytes = dstats->tx_bytes; |
| 162 | tpkts = dstats->tx_pkts; |
| 163 | tdrops = dstats->tx_drps; |
| 164 | rbytes = dstats->rx_bytes; |
| 165 | rpkts = dstats->rx_pkts; |
| 166 | } while (u64_stats_fetch_retry_irq(&dstats->syncp, start)); |
| 167 | stats->tx_bytes += tbytes; |
| 168 | stats->tx_packets += tpkts; |
| 169 | stats->tx_dropped += tdrops; |
| 170 | stats->rx_bytes += rbytes; |
| 171 | stats->rx_packets += rpkts; |
| 172 | } |
| 173 | } |
| 174 | |
| 175 | static struct vrf_map *netns_vrf_map(struct net *net) |
| 176 | { |
| 177 | struct netns_vrf *nn_vrf = net_generic(net, vrf_net_id); |
| 178 | |
| 179 | return &nn_vrf->vmap; |
| 180 | } |
| 181 | |
| 182 | static struct vrf_map *netns_vrf_map_by_dev(struct net_device *dev) |
| 183 | { |
| 184 | return netns_vrf_map(dev_net(dev)); |
| 185 | } |
| 186 | |
| 187 | static int vrf_map_elem_get_vrf_ifindex(struct vrf_map_elem *me) |
| 188 | { |
| 189 | struct list_head *me_head = &me->vrf_list; |
| 190 | struct net_vrf *vrf; |
| 191 | |
| 192 | if (list_empty(me_head)) |
| 193 | return -ENODEV; |
| 194 | |
| 195 | vrf = list_first_entry(me_head, struct net_vrf, me_list); |
| 196 | |
| 197 | return vrf->ifindex; |
| 198 | } |
| 199 | |
| 200 | static struct vrf_map_elem *vrf_map_elem_alloc(gfp_t flags) |
| 201 | { |
| 202 | struct vrf_map_elem *me; |
| 203 | |
| 204 | me = kmalloc(sizeof(*me), flags); |
| 205 | if (!me) |
| 206 | return NULL; |
| 207 | |
| 208 | return me; |
| 209 | } |
| 210 | |
| 211 | static void vrf_map_elem_free(struct vrf_map_elem *me) |
| 212 | { |
| 213 | kfree(me); |
| 214 | } |
| 215 | |
| 216 | static void vrf_map_elem_init(struct vrf_map_elem *me, int table_id, |
| 217 | int ifindex, int users) |
| 218 | { |
| 219 | me->table_id = table_id; |
| 220 | me->ifindex = ifindex; |
| 221 | me->users = users; |
| 222 | INIT_LIST_HEAD(&me->vrf_list); |
| 223 | } |
| 224 | |
| 225 | static struct vrf_map_elem *vrf_map_lookup_elem(struct vrf_map *vmap, |
| 226 | u32 table_id) |
| 227 | { |
| 228 | struct vrf_map_elem *me; |
| 229 | u32 key; |
| 230 | |
| 231 | key = jhash_1word(table_id, HASH_INITVAL); |
| 232 | hash_for_each_possible(vmap->ht, me, hnode, key) { |
| 233 | if (me->table_id == table_id) |
| 234 | return me; |
| 235 | } |
| 236 | |
| 237 | return NULL; |
| 238 | } |
| 239 | |
| 240 | static void vrf_map_add_elem(struct vrf_map *vmap, struct vrf_map_elem *me) |
| 241 | { |
| 242 | u32 table_id = me->table_id; |
| 243 | u32 key; |
| 244 | |
| 245 | key = jhash_1word(table_id, HASH_INITVAL); |
| 246 | hash_add(vmap->ht, &me->hnode, key); |
| 247 | } |
| 248 | |
| 249 | static void vrf_map_del_elem(struct vrf_map_elem *me) |
| 250 | { |
| 251 | hash_del(&me->hnode); |
| 252 | } |
| 253 | |
| 254 | static void vrf_map_lock(struct vrf_map *vmap) __acquires(&vmap->vmap_lock) |
| 255 | { |
| 256 | spin_lock(&vmap->vmap_lock); |
| 257 | } |
| 258 | |
| 259 | static void vrf_map_unlock(struct vrf_map *vmap) __releases(&vmap->vmap_lock) |
| 260 | { |
| 261 | spin_unlock(&vmap->vmap_lock); |
| 262 | } |
| 263 | |
| 264 | /* called with rtnl lock held */ |
| 265 | static int |
| 266 | vrf_map_register_dev(struct net_device *dev, struct netlink_ext_ack *extack) |
| 267 | { |
| 268 | struct vrf_map *vmap = netns_vrf_map_by_dev(dev); |
| 269 | struct net_vrf *vrf = netdev_priv(dev); |
| 270 | struct vrf_map_elem *new_me, *me; |
| 271 | u32 table_id = vrf->tb_id; |
| 272 | bool free_new_me = false; |
| 273 | int users; |
| 274 | int res; |
| 275 | |
| 276 | /* we pre-allocate elements used in the spin-locked section (so that we |
| 277 | * keep the spinlock as short as possibile). |
| 278 | */ |
| 279 | new_me = vrf_map_elem_alloc(GFP_KERNEL); |
| 280 | if (!new_me) |
| 281 | return -ENOMEM; |
| 282 | |
| 283 | vrf_map_elem_init(new_me, table_id, dev->ifindex, 0); |
| 284 | |
| 285 | vrf_map_lock(vmap); |
| 286 | |
| 287 | me = vrf_map_lookup_elem(vmap, table_id); |
| 288 | if (!me) { |
| 289 | me = new_me; |
| 290 | vrf_map_add_elem(vmap, me); |
| 291 | goto link_vrf; |
| 292 | } |
| 293 | |
| 294 | /* we already have an entry in the vrf_map, so it means there is (at |
| 295 | * least) a vrf registered on the specific table. |
| 296 | */ |
| 297 | free_new_me = true; |
| 298 | if (vmap->strict_mode) { |
| 299 | /* vrfs cannot share the same table */ |
| 300 | NL_SET_ERR_MSG(extack, "Table is used by another VRF"); |
| 301 | res = -EBUSY; |
| 302 | goto unlock; |
| 303 | } |
| 304 | |
| 305 | link_vrf: |
| 306 | users = ++me->users; |
| 307 | if (users == 2) |
| 308 | ++vmap->shared_tables; |
| 309 | |
| 310 | list_add(&vrf->me_list, &me->vrf_list); |
| 311 | |
| 312 | res = 0; |
| 313 | |
| 314 | unlock: |
| 315 | vrf_map_unlock(vmap); |
| 316 | |
| 317 | /* clean-up, if needed */ |
| 318 | if (free_new_me) |
| 319 | vrf_map_elem_free(new_me); |
| 320 | |
| 321 | return res; |
| 322 | } |
| 323 | |
| 324 | /* called with rtnl lock held */ |
| 325 | static void vrf_map_unregister_dev(struct net_device *dev) |
| 326 | { |
| 327 | struct vrf_map *vmap = netns_vrf_map_by_dev(dev); |
| 328 | struct net_vrf *vrf = netdev_priv(dev); |
| 329 | u32 table_id = vrf->tb_id; |
| 330 | struct vrf_map_elem *me; |
| 331 | int users; |
| 332 | |
| 333 | vrf_map_lock(vmap); |
| 334 | |
| 335 | me = vrf_map_lookup_elem(vmap, table_id); |
| 336 | if (!me) |
| 337 | goto unlock; |
| 338 | |
| 339 | list_del(&vrf->me_list); |
| 340 | |
| 341 | users = --me->users; |
| 342 | if (users == 1) { |
| 343 | --vmap->shared_tables; |
| 344 | } else if (users == 0) { |
| 345 | vrf_map_del_elem(me); |
| 346 | |
| 347 | /* no one will refer to this element anymore */ |
| 348 | vrf_map_elem_free(me); |
| 349 | } |
| 350 | |
| 351 | unlock: |
| 352 | vrf_map_unlock(vmap); |
| 353 | } |
| 354 | |
| 355 | /* return the vrf device index associated with the table_id */ |
| 356 | static int vrf_ifindex_lookup_by_table_id(struct net *net, u32 table_id) |
| 357 | { |
| 358 | struct vrf_map *vmap = netns_vrf_map(net); |
| 359 | struct vrf_map_elem *me; |
| 360 | int ifindex; |
| 361 | |
| 362 | vrf_map_lock(vmap); |
| 363 | |
| 364 | if (!vmap->strict_mode) { |
| 365 | ifindex = -EPERM; |
| 366 | goto unlock; |
| 367 | } |
| 368 | |
| 369 | me = vrf_map_lookup_elem(vmap, table_id); |
| 370 | if (!me) { |
| 371 | ifindex = -ENODEV; |
| 372 | goto unlock; |
| 373 | } |
| 374 | |
| 375 | ifindex = vrf_map_elem_get_vrf_ifindex(me); |
| 376 | |
| 377 | unlock: |
| 378 | vrf_map_unlock(vmap); |
| 379 | |
| 380 | return ifindex; |
| 381 | } |
| 382 | |
| 383 | /* by default VRF devices do not have a qdisc and are expected |
| 384 | * to be created with only a single queue. |
| 385 | */ |
| 386 | static bool qdisc_tx_is_default(const struct net_device *dev) |
| 387 | { |
| 388 | struct netdev_queue *txq; |
| 389 | struct Qdisc *qdisc; |
| 390 | |
| 391 | if (dev->num_tx_queues > 1) |
| 392 | return false; |
| 393 | |
| 394 | txq = netdev_get_tx_queue(dev, 0); |
| 395 | qdisc = rcu_access_pointer(txq->qdisc); |
| 396 | |
| 397 | return !qdisc->enqueue; |
| 398 | } |
| 399 | |
| 400 | /* Local traffic destined to local address. Reinsert the packet to rx |
| 401 | * path, similar to loopback handling. |
| 402 | */ |
| 403 | static int vrf_local_xmit(struct sk_buff *skb, struct net_device *dev, |
| 404 | struct dst_entry *dst) |
| 405 | { |
| 406 | int len = skb->len; |
| 407 | |
| 408 | skb_orphan(skb); |
| 409 | |
| 410 | skb_dst_set(skb, dst); |
| 411 | |
| 412 | /* set pkt_type to avoid skb hitting packet taps twice - |
| 413 | * once on Tx and again in Rx processing |
| 414 | */ |
| 415 | skb->pkt_type = PACKET_LOOPBACK; |
| 416 | |
| 417 | skb->protocol = eth_type_trans(skb, dev); |
| 418 | |
| 419 | if (likely(netif_rx(skb) == NET_RX_SUCCESS)) |
| 420 | vrf_rx_stats(dev, len); |
| 421 | else |
| 422 | this_cpu_inc(dev->dstats->rx_drps); |
| 423 | |
| 424 | return NETDEV_TX_OK; |
| 425 | } |
| 426 | |
| 427 | #if IS_ENABLED(CONFIG_IPV6) |
| 428 | static int vrf_ip6_local_out(struct net *net, struct sock *sk, |
| 429 | struct sk_buff *skb) |
| 430 | { |
| 431 | int err; |
| 432 | |
| 433 | err = nf_hook(NFPROTO_IPV6, NF_INET_LOCAL_OUT, net, |
| 434 | sk, skb, NULL, skb_dst(skb)->dev, dst_output); |
| 435 | |
| 436 | if (likely(err == 1)) |
| 437 | err = dst_output(net, sk, skb); |
| 438 | |
| 439 | return err; |
| 440 | } |
| 441 | |
| 442 | static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb, |
| 443 | struct net_device *dev) |
| 444 | { |
| 445 | const struct ipv6hdr *iph; |
| 446 | struct net *net = dev_net(skb->dev); |
| 447 | struct flowi6 fl6; |
| 448 | int ret = NET_XMIT_DROP; |
| 449 | struct dst_entry *dst; |
| 450 | struct dst_entry *dst_null = &net->ipv6.ip6_null_entry->dst; |
| 451 | |
| 452 | if (!pskb_may_pull(skb, ETH_HLEN + sizeof(struct ipv6hdr))) |
| 453 | goto err; |
| 454 | |
| 455 | iph = ipv6_hdr(skb); |
| 456 | |
| 457 | memset(&fl6, 0, sizeof(fl6)); |
| 458 | /* needed to match OIF rule */ |
| 459 | fl6.flowi6_oif = dev->ifindex; |
| 460 | fl6.flowi6_iif = LOOPBACK_IFINDEX; |
| 461 | fl6.daddr = iph->daddr; |
| 462 | fl6.saddr = iph->saddr; |
| 463 | fl6.flowlabel = ip6_flowinfo(iph); |
| 464 | fl6.flowi6_mark = skb->mark; |
| 465 | fl6.flowi6_proto = iph->nexthdr; |
| 466 | fl6.flowi6_flags = FLOWI_FLAG_SKIP_NH_OIF; |
| 467 | |
| 468 | dst = ip6_dst_lookup_flow(net, NULL, &fl6, NULL); |
| 469 | if (IS_ERR(dst) || dst == dst_null) |
| 470 | goto err; |
| 471 | |
| 472 | skb_dst_drop(skb); |
| 473 | |
| 474 | /* if dst.dev is the VRF device again this is locally originated traffic |
| 475 | * destined to a local address. Short circuit to Rx path. |
| 476 | */ |
| 477 | if (dst->dev == dev) |
| 478 | return vrf_local_xmit(skb, dev, dst); |
| 479 | |
| 480 | skb_dst_set(skb, dst); |
| 481 | |
| 482 | /* strip the ethernet header added for pass through VRF device */ |
| 483 | __skb_pull(skb, skb_network_offset(skb)); |
| 484 | |
| 485 | ret = vrf_ip6_local_out(net, skb->sk, skb); |
| 486 | if (unlikely(net_xmit_eval(ret))) |
| 487 | dev->stats.tx_errors++; |
| 488 | else |
| 489 | ret = NET_XMIT_SUCCESS; |
| 490 | |
| 491 | return ret; |
| 492 | err: |
| 493 | vrf_tx_error(dev, skb); |
| 494 | return NET_XMIT_DROP; |
| 495 | } |
| 496 | #else |
| 497 | static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb, |
| 498 | struct net_device *dev) |
| 499 | { |
| 500 | vrf_tx_error(dev, skb); |
| 501 | return NET_XMIT_DROP; |
| 502 | } |
| 503 | #endif |
| 504 | |
| 505 | /* based on ip_local_out; can't use it b/c the dst is switched pointing to us */ |
| 506 | static int vrf_ip_local_out(struct net *net, struct sock *sk, |
| 507 | struct sk_buff *skb) |
| 508 | { |
| 509 | int err; |
| 510 | |
| 511 | err = nf_hook(NFPROTO_IPV4, NF_INET_LOCAL_OUT, net, sk, |
| 512 | skb, NULL, skb_dst(skb)->dev, dst_output); |
| 513 | if (likely(err == 1)) |
| 514 | err = dst_output(net, sk, skb); |
| 515 | |
| 516 | return err; |
| 517 | } |
| 518 | |
| 519 | static netdev_tx_t vrf_process_v4_outbound(struct sk_buff *skb, |
| 520 | struct net_device *vrf_dev) |
| 521 | { |
| 522 | struct iphdr *ip4h; |
| 523 | int ret = NET_XMIT_DROP; |
| 524 | struct flowi4 fl4; |
| 525 | struct net *net = dev_net(vrf_dev); |
| 526 | struct rtable *rt; |
| 527 | |
| 528 | if (!pskb_may_pull(skb, ETH_HLEN + sizeof(struct iphdr))) |
| 529 | goto err; |
| 530 | |
| 531 | ip4h = ip_hdr(skb); |
| 532 | |
| 533 | memset(&fl4, 0, sizeof(fl4)); |
| 534 | /* needed to match OIF rule */ |
| 535 | fl4.flowi4_oif = vrf_dev->ifindex; |
| 536 | fl4.flowi4_iif = LOOPBACK_IFINDEX; |
| 537 | fl4.flowi4_tos = RT_TOS(ip4h->tos); |
| 538 | fl4.flowi4_flags = FLOWI_FLAG_ANYSRC | FLOWI_FLAG_SKIP_NH_OIF; |
| 539 | fl4.flowi4_proto = ip4h->protocol; |
| 540 | fl4.daddr = ip4h->daddr; |
| 541 | fl4.saddr = ip4h->saddr; |
| 542 | |
| 543 | rt = ip_route_output_flow(net, &fl4, NULL); |
| 544 | if (IS_ERR(rt)) |
| 545 | goto err; |
| 546 | |
| 547 | skb_dst_drop(skb); |
| 548 | |
| 549 | /* if dst.dev is the VRF device again this is locally originated traffic |
| 550 | * destined to a local address. Short circuit to Rx path. |
| 551 | */ |
| 552 | if (rt->dst.dev == vrf_dev) |
| 553 | return vrf_local_xmit(skb, vrf_dev, &rt->dst); |
| 554 | |
| 555 | skb_dst_set(skb, &rt->dst); |
| 556 | |
| 557 | /* strip the ethernet header added for pass through VRF device */ |
| 558 | __skb_pull(skb, skb_network_offset(skb)); |
| 559 | |
| 560 | if (!ip4h->saddr) { |
| 561 | ip4h->saddr = inet_select_addr(skb_dst(skb)->dev, 0, |
| 562 | RT_SCOPE_LINK); |
| 563 | } |
| 564 | |
| 565 | ret = vrf_ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb); |
| 566 | if (unlikely(net_xmit_eval(ret))) |
| 567 | vrf_dev->stats.tx_errors++; |
| 568 | else |
| 569 | ret = NET_XMIT_SUCCESS; |
| 570 | |
| 571 | out: |
| 572 | return ret; |
| 573 | err: |
| 574 | vrf_tx_error(vrf_dev, skb); |
| 575 | goto out; |
| 576 | } |
| 577 | |
| 578 | static netdev_tx_t is_ip_tx_frame(struct sk_buff *skb, struct net_device *dev) |
| 579 | { |
| 580 | switch (skb->protocol) { |
| 581 | case htons(ETH_P_IP): |
| 582 | return vrf_process_v4_outbound(skb, dev); |
| 583 | case htons(ETH_P_IPV6): |
| 584 | return vrf_process_v6_outbound(skb, dev); |
| 585 | default: |
| 586 | vrf_tx_error(dev, skb); |
| 587 | return NET_XMIT_DROP; |
| 588 | } |
| 589 | } |
| 590 | |
| 591 | static netdev_tx_t vrf_xmit(struct sk_buff *skb, struct net_device *dev) |
| 592 | { |
| 593 | int len = skb->len; |
| 594 | netdev_tx_t ret = is_ip_tx_frame(skb, dev); |
| 595 | |
| 596 | if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { |
| 597 | struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats); |
| 598 | |
| 599 | u64_stats_update_begin(&dstats->syncp); |
| 600 | dstats->tx_pkts++; |
| 601 | dstats->tx_bytes += len; |
| 602 | u64_stats_update_end(&dstats->syncp); |
| 603 | } else { |
| 604 | this_cpu_inc(dev->dstats->tx_drps); |
| 605 | } |
| 606 | |
| 607 | return ret; |
| 608 | } |
| 609 | |
| 610 | static void vrf_finish_direct(struct sk_buff *skb) |
| 611 | { |
| 612 | struct net_device *vrf_dev = skb->dev; |
| 613 | |
| 614 | if (!list_empty(&vrf_dev->ptype_all) && |
| 615 | likely(skb_headroom(skb) >= ETH_HLEN)) { |
| 616 | struct ethhdr *eth = skb_push(skb, ETH_HLEN); |
| 617 | |
| 618 | ether_addr_copy(eth->h_source, vrf_dev->dev_addr); |
| 619 | eth_zero_addr(eth->h_dest); |
| 620 | eth->h_proto = skb->protocol; |
| 621 | |
| 622 | rcu_read_lock_bh(); |
| 623 | dev_queue_xmit_nit(skb, vrf_dev); |
| 624 | rcu_read_unlock_bh(); |
| 625 | |
| 626 | skb_pull(skb, ETH_HLEN); |
| 627 | } |
| 628 | |
| 629 | /* reset skb device */ |
| 630 | nf_reset_ct(skb); |
| 631 | } |
| 632 | |
| 633 | #if IS_ENABLED(CONFIG_IPV6) |
| 634 | /* modelled after ip6_finish_output2 */ |
| 635 | static int vrf_finish_output6(struct net *net, struct sock *sk, |
| 636 | struct sk_buff *skb) |
| 637 | { |
| 638 | struct dst_entry *dst = skb_dst(skb); |
| 639 | struct net_device *dev = dst->dev; |
| 640 | const struct in6_addr *nexthop; |
| 641 | struct neighbour *neigh; |
| 642 | int ret; |
| 643 | |
| 644 | nf_reset_ct(skb); |
| 645 | |
| 646 | skb->protocol = htons(ETH_P_IPV6); |
| 647 | skb->dev = dev; |
| 648 | |
| 649 | rcu_read_lock_bh(); |
| 650 | nexthop = rt6_nexthop((struct rt6_info *)dst, &ipv6_hdr(skb)->daddr); |
| 651 | neigh = __ipv6_neigh_lookup_noref(dst->dev, nexthop); |
| 652 | if (unlikely(!neigh)) |
| 653 | neigh = __neigh_create(&nd_tbl, nexthop, dst->dev, false); |
| 654 | if (!IS_ERR(neigh)) { |
| 655 | sock_confirm_neigh(skb, neigh); |
| 656 | ret = neigh_output(neigh, skb, false); |
| 657 | rcu_read_unlock_bh(); |
| 658 | return ret; |
| 659 | } |
| 660 | rcu_read_unlock_bh(); |
| 661 | |
| 662 | IP6_INC_STATS(dev_net(dst->dev), |
| 663 | ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES); |
| 664 | kfree_skb(skb); |
| 665 | return -EINVAL; |
| 666 | } |
| 667 | |
| 668 | /* modelled after ip6_output */ |
| 669 | static int vrf_output6(struct net *net, struct sock *sk, struct sk_buff *skb) |
| 670 | { |
| 671 | return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING, |
| 672 | net, sk, skb, NULL, skb_dst(skb)->dev, |
| 673 | vrf_finish_output6, |
| 674 | !(IP6CB(skb)->flags & IP6SKB_REROUTED)); |
| 675 | } |
| 676 | |
| 677 | /* set dst on skb to send packet to us via dev_xmit path. Allows |
| 678 | * packet to go through device based features such as qdisc, netfilter |
| 679 | * hooks and packet sockets with skb->dev set to vrf device. |
| 680 | */ |
| 681 | static struct sk_buff *vrf_ip6_out_redirect(struct net_device *vrf_dev, |
| 682 | struct sk_buff *skb) |
| 683 | { |
| 684 | struct net_vrf *vrf = netdev_priv(vrf_dev); |
| 685 | struct dst_entry *dst = NULL; |
| 686 | struct rt6_info *rt6; |
| 687 | |
| 688 | rcu_read_lock(); |
| 689 | |
| 690 | rt6 = rcu_dereference(vrf->rt6); |
| 691 | if (likely(rt6)) { |
| 692 | dst = &rt6->dst; |
| 693 | dst_hold(dst); |
| 694 | } |
| 695 | |
| 696 | rcu_read_unlock(); |
| 697 | |
| 698 | if (unlikely(!dst)) { |
| 699 | vrf_tx_error(vrf_dev, skb); |
| 700 | return NULL; |
| 701 | } |
| 702 | |
| 703 | skb_dst_drop(skb); |
| 704 | skb_dst_set(skb, dst); |
| 705 | |
| 706 | return skb; |
| 707 | } |
| 708 | |
| 709 | static int vrf_output6_direct_finish(struct net *net, struct sock *sk, |
| 710 | struct sk_buff *skb) |
| 711 | { |
| 712 | vrf_finish_direct(skb); |
| 713 | |
| 714 | return vrf_ip6_local_out(net, sk, skb); |
| 715 | } |
| 716 | |
| 717 | static int vrf_output6_direct(struct net *net, struct sock *sk, |
| 718 | struct sk_buff *skb) |
| 719 | { |
| 720 | int err = 1; |
| 721 | |
| 722 | skb->protocol = htons(ETH_P_IPV6); |
| 723 | |
| 724 | if (!(IPCB(skb)->flags & IPSKB_REROUTED)) |
| 725 | err = nf_hook(NFPROTO_IPV6, NF_INET_POST_ROUTING, net, sk, skb, |
| 726 | NULL, skb->dev, vrf_output6_direct_finish); |
| 727 | |
| 728 | if (likely(err == 1)) |
| 729 | vrf_finish_direct(skb); |
| 730 | |
| 731 | return err; |
| 732 | } |
| 733 | |
| 734 | static int vrf_ip6_out_direct_finish(struct net *net, struct sock *sk, |
| 735 | struct sk_buff *skb) |
| 736 | { |
| 737 | int err; |
| 738 | |
| 739 | err = vrf_output6_direct(net, sk, skb); |
| 740 | if (likely(err == 1)) |
| 741 | err = vrf_ip6_local_out(net, sk, skb); |
| 742 | |
| 743 | return err; |
| 744 | } |
| 745 | |
| 746 | static struct sk_buff *vrf_ip6_out_direct(struct net_device *vrf_dev, |
| 747 | struct sock *sk, |
| 748 | struct sk_buff *skb) |
| 749 | { |
| 750 | struct net *net = dev_net(vrf_dev); |
| 751 | int err; |
| 752 | |
| 753 | skb->dev = vrf_dev; |
| 754 | |
| 755 | err = nf_hook(NFPROTO_IPV6, NF_INET_LOCAL_OUT, net, sk, |
| 756 | skb, NULL, vrf_dev, vrf_ip6_out_direct_finish); |
| 757 | |
| 758 | if (likely(err == 1)) |
| 759 | err = vrf_output6_direct(net, sk, skb); |
| 760 | |
| 761 | if (likely(err == 1)) |
| 762 | return skb; |
| 763 | |
| 764 | return NULL; |
| 765 | } |
| 766 | |
| 767 | static struct sk_buff *vrf_ip6_out(struct net_device *vrf_dev, |
| 768 | struct sock *sk, |
| 769 | struct sk_buff *skb) |
| 770 | { |
| 771 | /* don't divert link scope packets */ |
| 772 | if (rt6_need_strict(&ipv6_hdr(skb)->daddr)) |
| 773 | return skb; |
| 774 | |
| 775 | if (qdisc_tx_is_default(vrf_dev) || |
| 776 | IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED) |
| 777 | return vrf_ip6_out_direct(vrf_dev, sk, skb); |
| 778 | |
| 779 | return vrf_ip6_out_redirect(vrf_dev, skb); |
| 780 | } |
| 781 | |
| 782 | /* holding rtnl */ |
| 783 | static void vrf_rt6_release(struct net_device *dev, struct net_vrf *vrf) |
| 784 | { |
| 785 | struct rt6_info *rt6 = rtnl_dereference(vrf->rt6); |
| 786 | struct net *net = dev_net(dev); |
| 787 | struct dst_entry *dst; |
| 788 | |
| 789 | RCU_INIT_POINTER(vrf->rt6, NULL); |
| 790 | synchronize_rcu(); |
| 791 | |
| 792 | /* move dev in dst's to loopback so this VRF device can be deleted |
| 793 | * - based on dst_ifdown |
| 794 | */ |
| 795 | if (rt6) { |
| 796 | dst = &rt6->dst; |
| 797 | dev_put(dst->dev); |
| 798 | dst->dev = net->loopback_dev; |
| 799 | dev_hold(dst->dev); |
| 800 | dst_release(dst); |
| 801 | } |
| 802 | } |
| 803 | |
| 804 | static int vrf_rt6_create(struct net_device *dev) |
| 805 | { |
| 806 | int flags = DST_NOPOLICY | DST_NOXFRM; |
| 807 | struct net_vrf *vrf = netdev_priv(dev); |
| 808 | struct net *net = dev_net(dev); |
| 809 | struct rt6_info *rt6; |
| 810 | int rc = -ENOMEM; |
| 811 | |
| 812 | /* IPv6 can be CONFIG enabled and then disabled runtime */ |
| 813 | if (!ipv6_mod_enabled()) |
| 814 | return 0; |
| 815 | |
| 816 | vrf->fib6_table = fib6_new_table(net, vrf->tb_id); |
| 817 | if (!vrf->fib6_table) |
| 818 | goto out; |
| 819 | |
| 820 | /* create a dst for routing packets out a VRF device */ |
| 821 | rt6 = ip6_dst_alloc(net, dev, flags); |
| 822 | if (!rt6) |
| 823 | goto out; |
| 824 | |
| 825 | rt6->dst.output = vrf_output6; |
| 826 | |
| 827 | rcu_assign_pointer(vrf->rt6, rt6); |
| 828 | |
| 829 | rc = 0; |
| 830 | out: |
| 831 | return rc; |
| 832 | } |
| 833 | #else |
| 834 | static struct sk_buff *vrf_ip6_out(struct net_device *vrf_dev, |
| 835 | struct sock *sk, |
| 836 | struct sk_buff *skb) |
| 837 | { |
| 838 | return skb; |
| 839 | } |
| 840 | |
| 841 | static void vrf_rt6_release(struct net_device *dev, struct net_vrf *vrf) |
| 842 | { |
| 843 | } |
| 844 | |
| 845 | static int vrf_rt6_create(struct net_device *dev) |
| 846 | { |
| 847 | return 0; |
| 848 | } |
| 849 | #endif |
| 850 | |
| 851 | /* modelled after ip_finish_output2 */ |
| 852 | static int vrf_finish_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
| 853 | { |
| 854 | struct dst_entry *dst = skb_dst(skb); |
| 855 | struct rtable *rt = (struct rtable *)dst; |
| 856 | struct net_device *dev = dst->dev; |
| 857 | unsigned int hh_len = LL_RESERVED_SPACE(dev); |
| 858 | struct neighbour *neigh; |
| 859 | bool is_v6gw = false; |
| 860 | int ret = -EINVAL; |
| 861 | |
| 862 | nf_reset_ct(skb); |
| 863 | |
| 864 | /* Be paranoid, rather than too clever. */ |
| 865 | if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) { |
| 866 | struct sk_buff *skb2; |
| 867 | |
| 868 | skb2 = skb_realloc_headroom(skb, LL_RESERVED_SPACE(dev)); |
| 869 | if (!skb2) { |
| 870 | ret = -ENOMEM; |
| 871 | goto err; |
| 872 | } |
| 873 | if (skb->sk) |
| 874 | skb_set_owner_w(skb2, skb->sk); |
| 875 | |
| 876 | consume_skb(skb); |
| 877 | skb = skb2; |
| 878 | } |
| 879 | |
| 880 | rcu_read_lock_bh(); |
| 881 | |
| 882 | neigh = ip_neigh_for_gw(rt, skb, &is_v6gw); |
| 883 | if (!IS_ERR(neigh)) { |
| 884 | sock_confirm_neigh(skb, neigh); |
| 885 | /* if crossing protocols, can not use the cached header */ |
| 886 | ret = neigh_output(neigh, skb, is_v6gw); |
| 887 | rcu_read_unlock_bh(); |
| 888 | return ret; |
| 889 | } |
| 890 | |
| 891 | rcu_read_unlock_bh(); |
| 892 | err: |
| 893 | vrf_tx_error(skb->dev, skb); |
| 894 | return ret; |
| 895 | } |
| 896 | |
| 897 | static int vrf_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
| 898 | { |
| 899 | struct net_device *dev = skb_dst(skb)->dev; |
| 900 | |
| 901 | IP_UPD_PO_STATS(net, IPSTATS_MIB_OUT, skb->len); |
| 902 | |
| 903 | skb->dev = dev; |
| 904 | skb->protocol = htons(ETH_P_IP); |
| 905 | |
| 906 | return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING, |
| 907 | net, sk, skb, NULL, dev, |
| 908 | vrf_finish_output, |
| 909 | !(IPCB(skb)->flags & IPSKB_REROUTED)); |
| 910 | } |
| 911 | |
| 912 | /* set dst on skb to send packet to us via dev_xmit path. Allows |
| 913 | * packet to go through device based features such as qdisc, netfilter |
| 914 | * hooks and packet sockets with skb->dev set to vrf device. |
| 915 | */ |
| 916 | static struct sk_buff *vrf_ip_out_redirect(struct net_device *vrf_dev, |
| 917 | struct sk_buff *skb) |
| 918 | { |
| 919 | struct net_vrf *vrf = netdev_priv(vrf_dev); |
| 920 | struct dst_entry *dst = NULL; |
| 921 | struct rtable *rth; |
| 922 | |
| 923 | rcu_read_lock(); |
| 924 | |
| 925 | rth = rcu_dereference(vrf->rth); |
| 926 | if (likely(rth)) { |
| 927 | dst = &rth->dst; |
| 928 | dst_hold(dst); |
| 929 | } |
| 930 | |
| 931 | rcu_read_unlock(); |
| 932 | |
| 933 | if (unlikely(!dst)) { |
| 934 | vrf_tx_error(vrf_dev, skb); |
| 935 | return NULL; |
| 936 | } |
| 937 | |
| 938 | skb_dst_drop(skb); |
| 939 | skb_dst_set(skb, dst); |
| 940 | |
| 941 | return skb; |
| 942 | } |
| 943 | |
| 944 | static int vrf_output_direct_finish(struct net *net, struct sock *sk, |
| 945 | struct sk_buff *skb) |
| 946 | { |
| 947 | vrf_finish_direct(skb); |
| 948 | |
| 949 | return vrf_ip_local_out(net, sk, skb); |
| 950 | } |
| 951 | |
| 952 | static int vrf_output_direct(struct net *net, struct sock *sk, |
| 953 | struct sk_buff *skb) |
| 954 | { |
| 955 | int err = 1; |
| 956 | |
| 957 | skb->protocol = htons(ETH_P_IP); |
| 958 | |
| 959 | if (!(IPCB(skb)->flags & IPSKB_REROUTED)) |
| 960 | err = nf_hook(NFPROTO_IPV4, NF_INET_POST_ROUTING, net, sk, skb, |
| 961 | NULL, skb->dev, vrf_output_direct_finish); |
| 962 | |
| 963 | if (likely(err == 1)) |
| 964 | vrf_finish_direct(skb); |
| 965 | |
| 966 | return err; |
| 967 | } |
| 968 | |
| 969 | static int vrf_ip_out_direct_finish(struct net *net, struct sock *sk, |
| 970 | struct sk_buff *skb) |
| 971 | { |
| 972 | int err; |
| 973 | |
| 974 | err = vrf_output_direct(net, sk, skb); |
| 975 | if (likely(err == 1)) |
| 976 | err = vrf_ip_local_out(net, sk, skb); |
| 977 | |
| 978 | return err; |
| 979 | } |
| 980 | |
| 981 | static struct sk_buff *vrf_ip_out_direct(struct net_device *vrf_dev, |
| 982 | struct sock *sk, |
| 983 | struct sk_buff *skb) |
| 984 | { |
| 985 | struct net *net = dev_net(vrf_dev); |
| 986 | int err; |
| 987 | |
| 988 | skb->dev = vrf_dev; |
| 989 | |
| 990 | err = nf_hook(NFPROTO_IPV4, NF_INET_LOCAL_OUT, net, sk, |
| 991 | skb, NULL, vrf_dev, vrf_ip_out_direct_finish); |
| 992 | |
| 993 | if (likely(err == 1)) |
| 994 | err = vrf_output_direct(net, sk, skb); |
| 995 | |
| 996 | if (likely(err == 1)) |
| 997 | return skb; |
| 998 | |
| 999 | return NULL; |
| 1000 | } |
| 1001 | |
| 1002 | static struct sk_buff *vrf_ip_out(struct net_device *vrf_dev, |
| 1003 | struct sock *sk, |
| 1004 | struct sk_buff *skb) |
| 1005 | { |
| 1006 | /* don't divert multicast or local broadcast */ |
| 1007 | if (ipv4_is_multicast(ip_hdr(skb)->daddr) || |
| 1008 | ipv4_is_lbcast(ip_hdr(skb)->daddr)) |
| 1009 | return skb; |
| 1010 | |
| 1011 | if (qdisc_tx_is_default(vrf_dev) || |
| 1012 | IPCB(skb)->flags & IPSKB_XFRM_TRANSFORMED) |
| 1013 | return vrf_ip_out_direct(vrf_dev, sk, skb); |
| 1014 | |
| 1015 | return vrf_ip_out_redirect(vrf_dev, skb); |
| 1016 | } |
| 1017 | |
| 1018 | /* called with rcu lock held */ |
| 1019 | static struct sk_buff *vrf_l3_out(struct net_device *vrf_dev, |
| 1020 | struct sock *sk, |
| 1021 | struct sk_buff *skb, |
| 1022 | u16 proto) |
| 1023 | { |
| 1024 | switch (proto) { |
| 1025 | case AF_INET: |
| 1026 | return vrf_ip_out(vrf_dev, sk, skb); |
| 1027 | case AF_INET6: |
| 1028 | return vrf_ip6_out(vrf_dev, sk, skb); |
| 1029 | } |
| 1030 | |
| 1031 | return skb; |
| 1032 | } |
| 1033 | |
| 1034 | /* holding rtnl */ |
| 1035 | static void vrf_rtable_release(struct net_device *dev, struct net_vrf *vrf) |
| 1036 | { |
| 1037 | struct rtable *rth = rtnl_dereference(vrf->rth); |
| 1038 | struct net *net = dev_net(dev); |
| 1039 | struct dst_entry *dst; |
| 1040 | |
| 1041 | RCU_INIT_POINTER(vrf->rth, NULL); |
| 1042 | synchronize_rcu(); |
| 1043 | |
| 1044 | /* move dev in dst's to loopback so this VRF device can be deleted |
| 1045 | * - based on dst_ifdown |
| 1046 | */ |
| 1047 | if (rth) { |
| 1048 | dst = &rth->dst; |
| 1049 | dev_put(dst->dev); |
| 1050 | dst->dev = net->loopback_dev; |
| 1051 | dev_hold(dst->dev); |
| 1052 | dst_release(dst); |
| 1053 | } |
| 1054 | } |
| 1055 | |
| 1056 | static int vrf_rtable_create(struct net_device *dev) |
| 1057 | { |
| 1058 | struct net_vrf *vrf = netdev_priv(dev); |
| 1059 | struct rtable *rth; |
| 1060 | |
| 1061 | if (!fib_new_table(dev_net(dev), vrf->tb_id)) |
| 1062 | return -ENOMEM; |
| 1063 | |
| 1064 | /* create a dst for routing packets out through a VRF device */ |
| 1065 | rth = rt_dst_alloc(dev, 0, RTN_UNICAST, 1, 1); |
| 1066 | if (!rth) |
| 1067 | return -ENOMEM; |
| 1068 | |
| 1069 | rth->dst.output = vrf_output; |
| 1070 | |
| 1071 | rcu_assign_pointer(vrf->rth, rth); |
| 1072 | |
| 1073 | return 0; |
| 1074 | } |
| 1075 | |
| 1076 | /**************************** device handling ********************/ |
| 1077 | |
| 1078 | /* cycle interface to flush neighbor cache and move routes across tables */ |
| 1079 | static void cycle_netdev(struct net_device *dev, |
| 1080 | struct netlink_ext_ack *extack) |
| 1081 | { |
| 1082 | unsigned int flags = dev->flags; |
| 1083 | int ret; |
| 1084 | |
| 1085 | if (!netif_running(dev)) |
| 1086 | return; |
| 1087 | |
| 1088 | ret = dev_change_flags(dev, flags & ~IFF_UP, extack); |
| 1089 | if (ret >= 0) |
| 1090 | ret = dev_change_flags(dev, flags, extack); |
| 1091 | |
| 1092 | if (ret < 0) { |
| 1093 | netdev_err(dev, |
| 1094 | "Failed to cycle device %s; route tables might be wrong!\n", |
| 1095 | dev->name); |
| 1096 | } |
| 1097 | } |
| 1098 | |
| 1099 | static int do_vrf_add_slave(struct net_device *dev, struct net_device *port_dev, |
| 1100 | struct netlink_ext_ack *extack) |
| 1101 | { |
| 1102 | int ret; |
| 1103 | |
| 1104 | /* do not allow loopback device to be enslaved to a VRF. |
| 1105 | * The vrf device acts as the loopback for the vrf. |
| 1106 | */ |
| 1107 | if (port_dev == dev_net(dev)->loopback_dev) { |
| 1108 | NL_SET_ERR_MSG(extack, |
| 1109 | "Can not enslave loopback device to a VRF"); |
| 1110 | return -EOPNOTSUPP; |
| 1111 | } |
| 1112 | |
| 1113 | port_dev->priv_flags |= IFF_L3MDEV_SLAVE; |
| 1114 | ret = netdev_master_upper_dev_link(port_dev, dev, NULL, NULL, extack); |
| 1115 | if (ret < 0) |
| 1116 | goto err; |
| 1117 | |
| 1118 | cycle_netdev(port_dev, extack); |
| 1119 | |
| 1120 | return 0; |
| 1121 | |
| 1122 | err: |
| 1123 | port_dev->priv_flags &= ~IFF_L3MDEV_SLAVE; |
| 1124 | return ret; |
| 1125 | } |
| 1126 | |
| 1127 | static int vrf_add_slave(struct net_device *dev, struct net_device *port_dev, |
| 1128 | struct netlink_ext_ack *extack) |
| 1129 | { |
| 1130 | if (netif_is_l3_master(port_dev)) { |
| 1131 | NL_SET_ERR_MSG(extack, |
| 1132 | "Can not enslave an L3 master device to a VRF"); |
| 1133 | return -EINVAL; |
| 1134 | } |
| 1135 | |
| 1136 | if (netif_is_l3_slave(port_dev)) |
| 1137 | return -EINVAL; |
| 1138 | |
| 1139 | return do_vrf_add_slave(dev, port_dev, extack); |
| 1140 | } |
| 1141 | |
| 1142 | /* inverse of do_vrf_add_slave */ |
| 1143 | static int do_vrf_del_slave(struct net_device *dev, struct net_device *port_dev) |
| 1144 | { |
| 1145 | netdev_upper_dev_unlink(port_dev, dev); |
| 1146 | port_dev->priv_flags &= ~IFF_L3MDEV_SLAVE; |
| 1147 | |
| 1148 | cycle_netdev(port_dev, NULL); |
| 1149 | |
| 1150 | return 0; |
| 1151 | } |
| 1152 | |
| 1153 | static int vrf_del_slave(struct net_device *dev, struct net_device *port_dev) |
| 1154 | { |
| 1155 | return do_vrf_del_slave(dev, port_dev); |
| 1156 | } |
| 1157 | |
| 1158 | static void vrf_dev_uninit(struct net_device *dev) |
| 1159 | { |
| 1160 | struct net_vrf *vrf = netdev_priv(dev); |
| 1161 | |
| 1162 | vrf_rtable_release(dev, vrf); |
| 1163 | vrf_rt6_release(dev, vrf); |
| 1164 | |
| 1165 | free_percpu(dev->dstats); |
| 1166 | dev->dstats = NULL; |
| 1167 | } |
| 1168 | |
| 1169 | static int vrf_dev_init(struct net_device *dev) |
| 1170 | { |
| 1171 | struct net_vrf *vrf = netdev_priv(dev); |
| 1172 | |
| 1173 | dev->dstats = netdev_alloc_pcpu_stats(struct pcpu_dstats); |
| 1174 | if (!dev->dstats) |
| 1175 | goto out_nomem; |
| 1176 | |
| 1177 | /* create the default dst which points back to us */ |
| 1178 | if (vrf_rtable_create(dev) != 0) |
| 1179 | goto out_stats; |
| 1180 | |
| 1181 | if (vrf_rt6_create(dev) != 0) |
| 1182 | goto out_rth; |
| 1183 | |
| 1184 | dev->flags = IFF_MASTER | IFF_NOARP; |
| 1185 | |
| 1186 | /* similarly, oper state is irrelevant; set to up to avoid confusion */ |
| 1187 | dev->operstate = IF_OPER_UP; |
| 1188 | netdev_lockdep_set_classes(dev); |
| 1189 | return 0; |
| 1190 | |
| 1191 | out_rth: |
| 1192 | vrf_rtable_release(dev, vrf); |
| 1193 | out_stats: |
| 1194 | free_percpu(dev->dstats); |
| 1195 | dev->dstats = NULL; |
| 1196 | out_nomem: |
| 1197 | return -ENOMEM; |
| 1198 | } |
| 1199 | |
| 1200 | static const struct net_device_ops vrf_netdev_ops = { |
| 1201 | .ndo_init = vrf_dev_init, |
| 1202 | .ndo_uninit = vrf_dev_uninit, |
| 1203 | .ndo_start_xmit = vrf_xmit, |
| 1204 | .ndo_set_mac_address = eth_mac_addr, |
| 1205 | .ndo_get_stats64 = vrf_get_stats64, |
| 1206 | .ndo_add_slave = vrf_add_slave, |
| 1207 | .ndo_del_slave = vrf_del_slave, |
| 1208 | }; |
| 1209 | |
| 1210 | static u32 vrf_fib_table(const struct net_device *dev) |
| 1211 | { |
| 1212 | struct net_vrf *vrf = netdev_priv(dev); |
| 1213 | |
| 1214 | return vrf->tb_id; |
| 1215 | } |
| 1216 | |
| 1217 | static int vrf_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb) |
| 1218 | { |
| 1219 | kfree_skb(skb); |
| 1220 | return 0; |
| 1221 | } |
| 1222 | |
| 1223 | static struct sk_buff *vrf_rcv_nfhook(u8 pf, unsigned int hook, |
| 1224 | struct sk_buff *skb, |
| 1225 | struct net_device *dev) |
| 1226 | { |
| 1227 | struct net *net = dev_net(dev); |
| 1228 | |
| 1229 | if (nf_hook(pf, hook, net, NULL, skb, dev, NULL, vrf_rcv_finish) != 1) |
| 1230 | skb = NULL; /* kfree_skb(skb) handled by nf code */ |
| 1231 | |
| 1232 | return skb; |
| 1233 | } |
| 1234 | |
| 1235 | static int vrf_prepare_mac_header(struct sk_buff *skb, |
| 1236 | struct net_device *vrf_dev, u16 proto) |
| 1237 | { |
| 1238 | struct ethhdr *eth; |
| 1239 | int err; |
| 1240 | |
| 1241 | /* in general, we do not know if there is enough space in the head of |
| 1242 | * the packet for hosting the mac header. |
| 1243 | */ |
| 1244 | err = skb_cow_head(skb, LL_RESERVED_SPACE(vrf_dev)); |
| 1245 | if (unlikely(err)) |
| 1246 | /* no space in the skb head */ |
| 1247 | return -ENOBUFS; |
| 1248 | |
| 1249 | __skb_push(skb, ETH_HLEN); |
| 1250 | eth = (struct ethhdr *)skb->data; |
| 1251 | |
| 1252 | skb_reset_mac_header(skb); |
| 1253 | |
| 1254 | /* we set the ethernet destination and the source addresses to the |
| 1255 | * address of the VRF device. |
| 1256 | */ |
| 1257 | ether_addr_copy(eth->h_dest, vrf_dev->dev_addr); |
| 1258 | ether_addr_copy(eth->h_source, vrf_dev->dev_addr); |
| 1259 | eth->h_proto = htons(proto); |
| 1260 | |
| 1261 | /* the destination address of the Ethernet frame corresponds to the |
| 1262 | * address set on the VRF interface; therefore, the packet is intended |
| 1263 | * to be processed locally. |
| 1264 | */ |
| 1265 | skb->protocol = eth->h_proto; |
| 1266 | skb->pkt_type = PACKET_HOST; |
| 1267 | |
| 1268 | skb_postpush_rcsum(skb, skb->data, ETH_HLEN); |
| 1269 | |
| 1270 | skb_pull_inline(skb, ETH_HLEN); |
| 1271 | |
| 1272 | return 0; |
| 1273 | } |
| 1274 | |
| 1275 | /* prepare and add the mac header to the packet if it was not set previously. |
| 1276 | * In this way, packet sniffers such as tcpdump can parse the packet correctly. |
| 1277 | * If the mac header was already set, the original mac header is left |
| 1278 | * untouched and the function returns immediately. |
| 1279 | */ |
| 1280 | static int vrf_add_mac_header_if_unset(struct sk_buff *skb, |
| 1281 | struct net_device *vrf_dev, |
| 1282 | u16 proto) |
| 1283 | { |
| 1284 | if (skb_mac_header_was_set(skb)) |
| 1285 | return 0; |
| 1286 | |
| 1287 | return vrf_prepare_mac_header(skb, vrf_dev, proto); |
| 1288 | } |
| 1289 | |
| 1290 | #if IS_ENABLED(CONFIG_IPV6) |
| 1291 | /* neighbor handling is done with actual device; do not want |
| 1292 | * to flip skb->dev for those ndisc packets. This really fails |
| 1293 | * for multiple next protocols (e.g., NEXTHDR_HOP). But it is |
| 1294 | * a start. |
| 1295 | */ |
| 1296 | static bool ipv6_ndisc_frame(const struct sk_buff *skb) |
| 1297 | { |
| 1298 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
| 1299 | bool rc = false; |
| 1300 | |
| 1301 | if (iph->nexthdr == NEXTHDR_ICMP) { |
| 1302 | const struct icmp6hdr *icmph; |
| 1303 | struct icmp6hdr _icmph; |
| 1304 | |
| 1305 | icmph = skb_header_pointer(skb, sizeof(*iph), |
| 1306 | sizeof(_icmph), &_icmph); |
| 1307 | if (!icmph) |
| 1308 | goto out; |
| 1309 | |
| 1310 | switch (icmph->icmp6_type) { |
| 1311 | case NDISC_ROUTER_SOLICITATION: |
| 1312 | case NDISC_ROUTER_ADVERTISEMENT: |
| 1313 | case NDISC_NEIGHBOUR_SOLICITATION: |
| 1314 | case NDISC_NEIGHBOUR_ADVERTISEMENT: |
| 1315 | case NDISC_REDIRECT: |
| 1316 | rc = true; |
| 1317 | break; |
| 1318 | } |
| 1319 | } |
| 1320 | |
| 1321 | out: |
| 1322 | return rc; |
| 1323 | } |
| 1324 | |
| 1325 | static struct rt6_info *vrf_ip6_route_lookup(struct net *net, |
| 1326 | const struct net_device *dev, |
| 1327 | struct flowi6 *fl6, |
| 1328 | int ifindex, |
| 1329 | const struct sk_buff *skb, |
| 1330 | int flags) |
| 1331 | { |
| 1332 | struct net_vrf *vrf = netdev_priv(dev); |
| 1333 | |
| 1334 | return ip6_pol_route(net, vrf->fib6_table, ifindex, fl6, skb, flags); |
| 1335 | } |
| 1336 | |
| 1337 | static void vrf_ip6_input_dst(struct sk_buff *skb, struct net_device *vrf_dev, |
| 1338 | int ifindex) |
| 1339 | { |
| 1340 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
| 1341 | struct flowi6 fl6 = { |
| 1342 | .flowi6_iif = ifindex, |
| 1343 | .flowi6_mark = skb->mark, |
| 1344 | .flowi6_proto = iph->nexthdr, |
| 1345 | .daddr = iph->daddr, |
| 1346 | .saddr = iph->saddr, |
| 1347 | .flowlabel = ip6_flowinfo(iph), |
| 1348 | }; |
| 1349 | struct net *net = dev_net(vrf_dev); |
| 1350 | struct rt6_info *rt6; |
| 1351 | |
| 1352 | rt6 = vrf_ip6_route_lookup(net, vrf_dev, &fl6, ifindex, skb, |
| 1353 | RT6_LOOKUP_F_HAS_SADDR | RT6_LOOKUP_F_IFACE); |
| 1354 | if (unlikely(!rt6)) |
| 1355 | return; |
| 1356 | |
| 1357 | if (unlikely(&rt6->dst == &net->ipv6.ip6_null_entry->dst)) |
| 1358 | return; |
| 1359 | |
| 1360 | skb_dst_set(skb, &rt6->dst); |
| 1361 | } |
| 1362 | |
| 1363 | static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev, |
| 1364 | struct sk_buff *skb) |
| 1365 | { |
| 1366 | int orig_iif = skb->skb_iif; |
| 1367 | bool need_strict = rt6_need_strict(&ipv6_hdr(skb)->daddr); |
| 1368 | bool is_ndisc = ipv6_ndisc_frame(skb); |
| 1369 | bool is_ll_src; |
| 1370 | |
| 1371 | /* loopback, multicast & non-ND link-local traffic; do not push through |
| 1372 | * packet taps again. Reset pkt_type for upper layers to process skb. |
| 1373 | * for packets with lladdr src, however, skip so that the dst can be |
| 1374 | * determine at input using original ifindex in the case that daddr |
| 1375 | * needs strict |
| 1376 | */ |
| 1377 | is_ll_src = ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL; |
| 1378 | if (skb->pkt_type == PACKET_LOOPBACK || |
| 1379 | (need_strict && !is_ndisc && !is_ll_src)) { |
| 1380 | skb->dev = vrf_dev; |
| 1381 | skb->skb_iif = vrf_dev->ifindex; |
| 1382 | IP6CB(skb)->flags |= IP6SKB_L3SLAVE; |
| 1383 | if (skb->pkt_type == PACKET_LOOPBACK) |
| 1384 | skb->pkt_type = PACKET_HOST; |
| 1385 | goto out; |
| 1386 | } |
| 1387 | |
| 1388 | /* if packet is NDISC then keep the ingress interface */ |
| 1389 | if (!is_ndisc) { |
| 1390 | vrf_rx_stats(vrf_dev, skb->len); |
| 1391 | skb->dev = vrf_dev; |
| 1392 | skb->skb_iif = vrf_dev->ifindex; |
| 1393 | |
| 1394 | if (!list_empty(&vrf_dev->ptype_all)) { |
| 1395 | int err; |
| 1396 | |
| 1397 | err = vrf_add_mac_header_if_unset(skb, vrf_dev, |
| 1398 | ETH_P_IPV6); |
| 1399 | if (likely(!err)) { |
| 1400 | skb_push(skb, skb->mac_len); |
| 1401 | dev_queue_xmit_nit(skb, vrf_dev); |
| 1402 | skb_pull(skb, skb->mac_len); |
| 1403 | } |
| 1404 | } |
| 1405 | |
| 1406 | IP6CB(skb)->flags |= IP6SKB_L3SLAVE; |
| 1407 | } |
| 1408 | |
| 1409 | if (need_strict) |
| 1410 | vrf_ip6_input_dst(skb, vrf_dev, orig_iif); |
| 1411 | |
| 1412 | skb = vrf_rcv_nfhook(NFPROTO_IPV6, NF_INET_PRE_ROUTING, skb, vrf_dev); |
| 1413 | out: |
| 1414 | return skb; |
| 1415 | } |
| 1416 | |
| 1417 | #else |
| 1418 | static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev, |
| 1419 | struct sk_buff *skb) |
| 1420 | { |
| 1421 | return skb; |
| 1422 | } |
| 1423 | #endif |
| 1424 | |
| 1425 | static struct sk_buff *vrf_ip_rcv(struct net_device *vrf_dev, |
| 1426 | struct sk_buff *skb) |
| 1427 | { |
| 1428 | skb->dev = vrf_dev; |
| 1429 | skb->skb_iif = vrf_dev->ifindex; |
| 1430 | IPCB(skb)->flags |= IPSKB_L3SLAVE; |
| 1431 | |
| 1432 | if (ipv4_is_multicast(ip_hdr(skb)->daddr)) |
| 1433 | goto out; |
| 1434 | |
| 1435 | /* loopback traffic; do not push through packet taps again. |
| 1436 | * Reset pkt_type for upper layers to process skb |
| 1437 | */ |
| 1438 | if (skb->pkt_type == PACKET_LOOPBACK) { |
| 1439 | skb->pkt_type = PACKET_HOST; |
| 1440 | goto out; |
| 1441 | } |
| 1442 | |
| 1443 | vrf_rx_stats(vrf_dev, skb->len); |
| 1444 | |
| 1445 | if (!list_empty(&vrf_dev->ptype_all)) { |
| 1446 | int err; |
| 1447 | |
| 1448 | err = vrf_add_mac_header_if_unset(skb, vrf_dev, ETH_P_IP); |
| 1449 | if (likely(!err)) { |
| 1450 | skb_push(skb, skb->mac_len); |
| 1451 | dev_queue_xmit_nit(skb, vrf_dev); |
| 1452 | skb_pull(skb, skb->mac_len); |
| 1453 | } |
| 1454 | } |
| 1455 | |
| 1456 | skb = vrf_rcv_nfhook(NFPROTO_IPV4, NF_INET_PRE_ROUTING, skb, vrf_dev); |
| 1457 | out: |
| 1458 | return skb; |
| 1459 | } |
| 1460 | |
| 1461 | /* called with rcu lock held */ |
| 1462 | static struct sk_buff *vrf_l3_rcv(struct net_device *vrf_dev, |
| 1463 | struct sk_buff *skb, |
| 1464 | u16 proto) |
| 1465 | { |
| 1466 | switch (proto) { |
| 1467 | case AF_INET: |
| 1468 | return vrf_ip_rcv(vrf_dev, skb); |
| 1469 | case AF_INET6: |
| 1470 | return vrf_ip6_rcv(vrf_dev, skb); |
| 1471 | } |
| 1472 | |
| 1473 | return skb; |
| 1474 | } |
| 1475 | |
| 1476 | #if IS_ENABLED(CONFIG_IPV6) |
| 1477 | /* send to link-local or multicast address via interface enslaved to |
| 1478 | * VRF device. Force lookup to VRF table without changing flow struct |
| 1479 | * Note: Caller to this function must hold rcu_read_lock() and no refcnt |
| 1480 | * is taken on the dst by this function. |
| 1481 | */ |
| 1482 | static struct dst_entry *vrf_link_scope_lookup(const struct net_device *dev, |
| 1483 | struct flowi6 *fl6) |
| 1484 | { |
| 1485 | struct net *net = dev_net(dev); |
| 1486 | int flags = RT6_LOOKUP_F_IFACE | RT6_LOOKUP_F_DST_NOREF; |
| 1487 | struct dst_entry *dst = NULL; |
| 1488 | struct rt6_info *rt; |
| 1489 | |
| 1490 | /* VRF device does not have a link-local address and |
| 1491 | * sending packets to link-local or mcast addresses over |
| 1492 | * a VRF device does not make sense |
| 1493 | */ |
| 1494 | if (fl6->flowi6_oif == dev->ifindex) { |
| 1495 | dst = &net->ipv6.ip6_null_entry->dst; |
| 1496 | return dst; |
| 1497 | } |
| 1498 | |
| 1499 | if (!ipv6_addr_any(&fl6->saddr)) |
| 1500 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
| 1501 | |
| 1502 | rt = vrf_ip6_route_lookup(net, dev, fl6, fl6->flowi6_oif, NULL, flags); |
| 1503 | if (rt) |
| 1504 | dst = &rt->dst; |
| 1505 | |
| 1506 | return dst; |
| 1507 | } |
| 1508 | #endif |
| 1509 | |
| 1510 | static const struct l3mdev_ops vrf_l3mdev_ops = { |
| 1511 | .l3mdev_fib_table = vrf_fib_table, |
| 1512 | .l3mdev_l3_rcv = vrf_l3_rcv, |
| 1513 | .l3mdev_l3_out = vrf_l3_out, |
| 1514 | #if IS_ENABLED(CONFIG_IPV6) |
| 1515 | .l3mdev_link_scope_lookup = vrf_link_scope_lookup, |
| 1516 | #endif |
| 1517 | }; |
| 1518 | |
| 1519 | static void vrf_get_drvinfo(struct net_device *dev, |
| 1520 | struct ethtool_drvinfo *info) |
| 1521 | { |
| 1522 | strlcpy(info->driver, DRV_NAME, sizeof(info->driver)); |
| 1523 | strlcpy(info->version, DRV_VERSION, sizeof(info->version)); |
| 1524 | } |
| 1525 | |
| 1526 | static const struct ethtool_ops vrf_ethtool_ops = { |
| 1527 | .get_drvinfo = vrf_get_drvinfo, |
| 1528 | }; |
| 1529 | |
| 1530 | static inline size_t vrf_fib_rule_nl_size(void) |
| 1531 | { |
| 1532 | size_t sz; |
| 1533 | |
| 1534 | sz = NLMSG_ALIGN(sizeof(struct fib_rule_hdr)); |
| 1535 | sz += nla_total_size(sizeof(u8)); /* FRA_L3MDEV */ |
| 1536 | sz += nla_total_size(sizeof(u32)); /* FRA_PRIORITY */ |
| 1537 | sz += nla_total_size(sizeof(u8)); /* FRA_PROTOCOL */ |
| 1538 | |
| 1539 | return sz; |
| 1540 | } |
| 1541 | |
| 1542 | static int vrf_fib_rule(const struct net_device *dev, __u8 family, bool add_it) |
| 1543 | { |
| 1544 | struct fib_rule_hdr *frh; |
| 1545 | struct nlmsghdr *nlh; |
| 1546 | struct sk_buff *skb; |
| 1547 | int err; |
| 1548 | |
| 1549 | if ((family == AF_INET6 || family == RTNL_FAMILY_IP6MR) && |
| 1550 | !ipv6_mod_enabled()) |
| 1551 | return 0; |
| 1552 | |
| 1553 | skb = nlmsg_new(vrf_fib_rule_nl_size(), GFP_KERNEL); |
| 1554 | if (!skb) |
| 1555 | return -ENOMEM; |
| 1556 | |
| 1557 | nlh = nlmsg_put(skb, 0, 0, 0, sizeof(*frh), 0); |
| 1558 | if (!nlh) |
| 1559 | goto nla_put_failure; |
| 1560 | |
| 1561 | /* rule only needs to appear once */ |
| 1562 | nlh->nlmsg_flags |= NLM_F_EXCL; |
| 1563 | |
| 1564 | frh = nlmsg_data(nlh); |
| 1565 | memset(frh, 0, sizeof(*frh)); |
| 1566 | frh->family = family; |
| 1567 | frh->action = FR_ACT_TO_TBL; |
| 1568 | |
| 1569 | if (nla_put_u8(skb, FRA_PROTOCOL, RTPROT_KERNEL)) |
| 1570 | goto nla_put_failure; |
| 1571 | |
| 1572 | if (nla_put_u8(skb, FRA_L3MDEV, 1)) |
| 1573 | goto nla_put_failure; |
| 1574 | |
| 1575 | if (nla_put_u32(skb, FRA_PRIORITY, FIB_RULE_PREF)) |
| 1576 | goto nla_put_failure; |
| 1577 | |
| 1578 | nlmsg_end(skb, nlh); |
| 1579 | |
| 1580 | /* fib_nl_{new,del}rule handling looks for net from skb->sk */ |
| 1581 | skb->sk = dev_net(dev)->rtnl; |
| 1582 | if (add_it) { |
| 1583 | err = fib_nl_newrule(skb, nlh, NULL); |
| 1584 | if (err == -EEXIST) |
| 1585 | err = 0; |
| 1586 | } else { |
| 1587 | err = fib_nl_delrule(skb, nlh, NULL); |
| 1588 | if (err == -ENOENT) |
| 1589 | err = 0; |
| 1590 | } |
| 1591 | nlmsg_free(skb); |
| 1592 | |
| 1593 | return err; |
| 1594 | |
| 1595 | nla_put_failure: |
| 1596 | nlmsg_free(skb); |
| 1597 | |
| 1598 | return -EMSGSIZE; |
| 1599 | } |
| 1600 | |
| 1601 | static int vrf_add_fib_rules(const struct net_device *dev) |
| 1602 | { |
| 1603 | int err; |
| 1604 | |
| 1605 | err = vrf_fib_rule(dev, AF_INET, true); |
| 1606 | if (err < 0) |
| 1607 | goto out_err; |
| 1608 | |
| 1609 | err = vrf_fib_rule(dev, AF_INET6, true); |
| 1610 | if (err < 0) |
| 1611 | goto ipv6_err; |
| 1612 | |
| 1613 | #if IS_ENABLED(CONFIG_IP_MROUTE_MULTIPLE_TABLES) |
| 1614 | err = vrf_fib_rule(dev, RTNL_FAMILY_IPMR, true); |
| 1615 | if (err < 0) |
| 1616 | goto ipmr_err; |
| 1617 | #endif |
| 1618 | |
| 1619 | #if IS_ENABLED(CONFIG_IPV6_MROUTE_MULTIPLE_TABLES) |
| 1620 | err = vrf_fib_rule(dev, RTNL_FAMILY_IP6MR, true); |
| 1621 | if (err < 0) |
| 1622 | goto ip6mr_err; |
| 1623 | #endif |
| 1624 | |
| 1625 | return 0; |
| 1626 | |
| 1627 | #if IS_ENABLED(CONFIG_IPV6_MROUTE_MULTIPLE_TABLES) |
| 1628 | ip6mr_err: |
| 1629 | vrf_fib_rule(dev, RTNL_FAMILY_IPMR, false); |
| 1630 | #endif |
| 1631 | |
| 1632 | #if IS_ENABLED(CONFIG_IP_MROUTE_MULTIPLE_TABLES) |
| 1633 | ipmr_err: |
| 1634 | vrf_fib_rule(dev, AF_INET6, false); |
| 1635 | #endif |
| 1636 | |
| 1637 | ipv6_err: |
| 1638 | vrf_fib_rule(dev, AF_INET, false); |
| 1639 | |
| 1640 | out_err: |
| 1641 | netdev_err(dev, "Failed to add FIB rules.\n"); |
| 1642 | return err; |
| 1643 | } |
| 1644 | |
| 1645 | static void vrf_setup(struct net_device *dev) |
| 1646 | { |
| 1647 | ether_setup(dev); |
| 1648 | |
| 1649 | /* Initialize the device structure. */ |
| 1650 | dev->netdev_ops = &vrf_netdev_ops; |
| 1651 | dev->l3mdev_ops = &vrf_l3mdev_ops; |
| 1652 | dev->ethtool_ops = &vrf_ethtool_ops; |
| 1653 | dev->needs_free_netdev = true; |
| 1654 | |
| 1655 | /* Fill in device structure with ethernet-generic values. */ |
| 1656 | eth_hw_addr_random(dev); |
| 1657 | |
| 1658 | /* don't acquire vrf device's netif_tx_lock when transmitting */ |
| 1659 | dev->features |= NETIF_F_LLTX; |
| 1660 | |
| 1661 | /* don't allow vrf devices to change network namespaces. */ |
| 1662 | dev->features |= NETIF_F_NETNS_LOCAL; |
| 1663 | |
| 1664 | /* does not make sense for a VLAN to be added to a vrf device */ |
| 1665 | dev->features |= NETIF_F_VLAN_CHALLENGED; |
| 1666 | |
| 1667 | /* enable offload features */ |
| 1668 | dev->features |= NETIF_F_GSO_SOFTWARE; |
| 1669 | dev->features |= NETIF_F_RXCSUM | NETIF_F_HW_CSUM | NETIF_F_SCTP_CRC; |
| 1670 | dev->features |= NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA; |
| 1671 | |
| 1672 | dev->hw_features = dev->features; |
| 1673 | dev->hw_enc_features = dev->features; |
| 1674 | |
| 1675 | /* default to no qdisc; user can add if desired */ |
| 1676 | dev->priv_flags |= IFF_NO_QUEUE; |
| 1677 | dev->priv_flags |= IFF_NO_RX_HANDLER; |
| 1678 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
| 1679 | |
| 1680 | /* VRF devices do not care about MTU, but if the MTU is set |
| 1681 | * too low then the ipv4 and ipv6 protocols are disabled |
| 1682 | * which breaks networking. |
| 1683 | */ |
| 1684 | dev->min_mtu = IPV6_MIN_MTU; |
| 1685 | dev->max_mtu = IP6_MAX_MTU; |
| 1686 | dev->mtu = dev->max_mtu; |
| 1687 | } |
| 1688 | |
| 1689 | static int vrf_validate(struct nlattr *tb[], struct nlattr *data[], |
| 1690 | struct netlink_ext_ack *extack) |
| 1691 | { |
| 1692 | if (tb[IFLA_ADDRESS]) { |
| 1693 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) { |
| 1694 | NL_SET_ERR_MSG(extack, "Invalid hardware address"); |
| 1695 | return -EINVAL; |
| 1696 | } |
| 1697 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) { |
| 1698 | NL_SET_ERR_MSG(extack, "Invalid hardware address"); |
| 1699 | return -EADDRNOTAVAIL; |
| 1700 | } |
| 1701 | } |
| 1702 | return 0; |
| 1703 | } |
| 1704 | |
| 1705 | static void vrf_dellink(struct net_device *dev, struct list_head *head) |
| 1706 | { |
| 1707 | struct net_device *port_dev; |
| 1708 | struct list_head *iter; |
| 1709 | |
| 1710 | netdev_for_each_lower_dev(dev, port_dev, iter) |
| 1711 | vrf_del_slave(dev, port_dev); |
| 1712 | |
| 1713 | vrf_map_unregister_dev(dev); |
| 1714 | |
| 1715 | unregister_netdevice_queue(dev, head); |
| 1716 | } |
| 1717 | |
| 1718 | static int vrf_newlink(struct net *src_net, struct net_device *dev, |
| 1719 | struct nlattr *tb[], struct nlattr *data[], |
| 1720 | struct netlink_ext_ack *extack) |
| 1721 | { |
| 1722 | struct net_vrf *vrf = netdev_priv(dev); |
| 1723 | struct netns_vrf *nn_vrf; |
| 1724 | bool *add_fib_rules; |
| 1725 | struct net *net; |
| 1726 | int err; |
| 1727 | |
| 1728 | if (!data || !data[IFLA_VRF_TABLE]) { |
| 1729 | NL_SET_ERR_MSG(extack, "VRF table id is missing"); |
| 1730 | return -EINVAL; |
| 1731 | } |
| 1732 | |
| 1733 | vrf->tb_id = nla_get_u32(data[IFLA_VRF_TABLE]); |
| 1734 | if (vrf->tb_id == RT_TABLE_UNSPEC) { |
| 1735 | NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VRF_TABLE], |
| 1736 | "Invalid VRF table id"); |
| 1737 | return -EINVAL; |
| 1738 | } |
| 1739 | |
| 1740 | dev->priv_flags |= IFF_L3MDEV_MASTER; |
| 1741 | |
| 1742 | err = register_netdevice(dev); |
| 1743 | if (err) |
| 1744 | goto out; |
| 1745 | |
| 1746 | /* mapping between table_id and vrf; |
| 1747 | * note: such binding could not be done in the dev init function |
| 1748 | * because dev->ifindex id is not available yet. |
| 1749 | */ |
| 1750 | vrf->ifindex = dev->ifindex; |
| 1751 | |
| 1752 | err = vrf_map_register_dev(dev, extack); |
| 1753 | if (err) { |
| 1754 | unregister_netdevice(dev); |
| 1755 | goto out; |
| 1756 | } |
| 1757 | |
| 1758 | net = dev_net(dev); |
| 1759 | nn_vrf = net_generic(net, vrf_net_id); |
| 1760 | |
| 1761 | add_fib_rules = &nn_vrf->add_fib_rules; |
| 1762 | if (*add_fib_rules) { |
| 1763 | err = vrf_add_fib_rules(dev); |
| 1764 | if (err) { |
| 1765 | vrf_map_unregister_dev(dev); |
| 1766 | unregister_netdevice(dev); |
| 1767 | goto out; |
| 1768 | } |
| 1769 | *add_fib_rules = false; |
| 1770 | } |
| 1771 | |
| 1772 | out: |
| 1773 | return err; |
| 1774 | } |
| 1775 | |
| 1776 | static size_t vrf_nl_getsize(const struct net_device *dev) |
| 1777 | { |
| 1778 | return nla_total_size(sizeof(u32)); /* IFLA_VRF_TABLE */ |
| 1779 | } |
| 1780 | |
| 1781 | static int vrf_fillinfo(struct sk_buff *skb, |
| 1782 | const struct net_device *dev) |
| 1783 | { |
| 1784 | struct net_vrf *vrf = netdev_priv(dev); |
| 1785 | |
| 1786 | return nla_put_u32(skb, IFLA_VRF_TABLE, vrf->tb_id); |
| 1787 | } |
| 1788 | |
| 1789 | static size_t vrf_get_slave_size(const struct net_device *bond_dev, |
| 1790 | const struct net_device *slave_dev) |
| 1791 | { |
| 1792 | return nla_total_size(sizeof(u32)); /* IFLA_VRF_PORT_TABLE */ |
| 1793 | } |
| 1794 | |
| 1795 | static int vrf_fill_slave_info(struct sk_buff *skb, |
| 1796 | const struct net_device *vrf_dev, |
| 1797 | const struct net_device *slave_dev) |
| 1798 | { |
| 1799 | struct net_vrf *vrf = netdev_priv(vrf_dev); |
| 1800 | |
| 1801 | if (nla_put_u32(skb, IFLA_VRF_PORT_TABLE, vrf->tb_id)) |
| 1802 | return -EMSGSIZE; |
| 1803 | |
| 1804 | return 0; |
| 1805 | } |
| 1806 | |
| 1807 | static const struct nla_policy vrf_nl_policy[IFLA_VRF_MAX + 1] = { |
| 1808 | [IFLA_VRF_TABLE] = { .type = NLA_U32 }, |
| 1809 | }; |
| 1810 | |
| 1811 | static struct rtnl_link_ops vrf_link_ops __read_mostly = { |
| 1812 | .kind = DRV_NAME, |
| 1813 | .priv_size = sizeof(struct net_vrf), |
| 1814 | |
| 1815 | .get_size = vrf_nl_getsize, |
| 1816 | .policy = vrf_nl_policy, |
| 1817 | .validate = vrf_validate, |
| 1818 | .fill_info = vrf_fillinfo, |
| 1819 | |
| 1820 | .get_slave_size = vrf_get_slave_size, |
| 1821 | .fill_slave_info = vrf_fill_slave_info, |
| 1822 | |
| 1823 | .newlink = vrf_newlink, |
| 1824 | .dellink = vrf_dellink, |
| 1825 | .setup = vrf_setup, |
| 1826 | .maxtype = IFLA_VRF_MAX, |
| 1827 | }; |
| 1828 | |
| 1829 | static int vrf_device_event(struct notifier_block *unused, |
| 1830 | unsigned long event, void *ptr) |
| 1831 | { |
| 1832 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
| 1833 | |
| 1834 | /* only care about unregister events to drop slave references */ |
| 1835 | if (event == NETDEV_UNREGISTER) { |
| 1836 | struct net_device *vrf_dev; |
| 1837 | |
| 1838 | if (!netif_is_l3_slave(dev)) |
| 1839 | goto out; |
| 1840 | |
| 1841 | vrf_dev = netdev_master_upper_dev_get(dev); |
| 1842 | vrf_del_slave(vrf_dev, dev); |
| 1843 | } |
| 1844 | out: |
| 1845 | return NOTIFY_DONE; |
| 1846 | } |
| 1847 | |
| 1848 | static struct notifier_block vrf_notifier_block __read_mostly = { |
| 1849 | .notifier_call = vrf_device_event, |
| 1850 | }; |
| 1851 | |
| 1852 | static int vrf_map_init(struct vrf_map *vmap) |
| 1853 | { |
| 1854 | spin_lock_init(&vmap->vmap_lock); |
| 1855 | hash_init(vmap->ht); |
| 1856 | |
| 1857 | vmap->strict_mode = false; |
| 1858 | |
| 1859 | return 0; |
| 1860 | } |
| 1861 | |
| 1862 | #ifdef CONFIG_SYSCTL |
| 1863 | static bool vrf_strict_mode(struct vrf_map *vmap) |
| 1864 | { |
| 1865 | bool strict_mode; |
| 1866 | |
| 1867 | vrf_map_lock(vmap); |
| 1868 | strict_mode = vmap->strict_mode; |
| 1869 | vrf_map_unlock(vmap); |
| 1870 | |
| 1871 | return strict_mode; |
| 1872 | } |
| 1873 | |
| 1874 | static int vrf_strict_mode_change(struct vrf_map *vmap, bool new_mode) |
| 1875 | { |
| 1876 | bool *cur_mode; |
| 1877 | int res = 0; |
| 1878 | |
| 1879 | vrf_map_lock(vmap); |
| 1880 | |
| 1881 | cur_mode = &vmap->strict_mode; |
| 1882 | if (*cur_mode == new_mode) |
| 1883 | goto unlock; |
| 1884 | |
| 1885 | if (*cur_mode) { |
| 1886 | /* disable strict mode */ |
| 1887 | *cur_mode = false; |
| 1888 | } else { |
| 1889 | if (vmap->shared_tables) { |
| 1890 | /* we cannot allow strict_mode because there are some |
| 1891 | * vrfs that share one or more tables. |
| 1892 | */ |
| 1893 | res = -EBUSY; |
| 1894 | goto unlock; |
| 1895 | } |
| 1896 | |
| 1897 | /* no tables are shared among vrfs, so we can go back |
| 1898 | * to 1:1 association between a vrf with its table. |
| 1899 | */ |
| 1900 | *cur_mode = true; |
| 1901 | } |
| 1902 | |
| 1903 | unlock: |
| 1904 | vrf_map_unlock(vmap); |
| 1905 | |
| 1906 | return res; |
| 1907 | } |
| 1908 | |
| 1909 | static int vrf_shared_table_handler(struct ctl_table *table, int write, |
| 1910 | void *buffer, size_t *lenp, loff_t *ppos) |
| 1911 | { |
| 1912 | struct net *net = (struct net *)table->extra1; |
| 1913 | struct vrf_map *vmap = netns_vrf_map(net); |
| 1914 | int proc_strict_mode = 0; |
| 1915 | struct ctl_table tmp = { |
| 1916 | .procname = table->procname, |
| 1917 | .data = &proc_strict_mode, |
| 1918 | .maxlen = sizeof(int), |
| 1919 | .mode = table->mode, |
| 1920 | .extra1 = SYSCTL_ZERO, |
| 1921 | .extra2 = SYSCTL_ONE, |
| 1922 | }; |
| 1923 | int ret; |
| 1924 | |
| 1925 | if (!write) |
| 1926 | proc_strict_mode = vrf_strict_mode(vmap); |
| 1927 | |
| 1928 | ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); |
| 1929 | |
| 1930 | if (write && ret == 0) |
| 1931 | ret = vrf_strict_mode_change(vmap, (bool)proc_strict_mode); |
| 1932 | |
| 1933 | return ret; |
| 1934 | } |
| 1935 | |
| 1936 | static const struct ctl_table vrf_table[] = { |
| 1937 | { |
| 1938 | .procname = "strict_mode", |
| 1939 | .data = NULL, |
| 1940 | .maxlen = sizeof(int), |
| 1941 | .mode = 0644, |
| 1942 | .proc_handler = vrf_shared_table_handler, |
| 1943 | /* set by the vrf_netns_init */ |
| 1944 | .extra1 = NULL, |
| 1945 | }, |
| 1946 | { }, |
| 1947 | }; |
| 1948 | |
| 1949 | static int vrf_netns_init_sysctl(struct net *net, struct netns_vrf *nn_vrf) |
| 1950 | { |
| 1951 | struct ctl_table *table; |
| 1952 | |
| 1953 | table = kmemdup(vrf_table, sizeof(vrf_table), GFP_KERNEL); |
| 1954 | if (!table) |
| 1955 | return -ENOMEM; |
| 1956 | |
| 1957 | /* init the extra1 parameter with the reference to current netns */ |
| 1958 | table[0].extra1 = net; |
| 1959 | |
| 1960 | nn_vrf->ctl_hdr = register_net_sysctl(net, "net/vrf", table); |
| 1961 | if (!nn_vrf->ctl_hdr) { |
| 1962 | kfree(table); |
| 1963 | return -ENOMEM; |
| 1964 | } |
| 1965 | |
| 1966 | return 0; |
| 1967 | } |
| 1968 | |
| 1969 | static void vrf_netns_exit_sysctl(struct net *net) |
| 1970 | { |
| 1971 | struct netns_vrf *nn_vrf = net_generic(net, vrf_net_id); |
| 1972 | struct ctl_table *table; |
| 1973 | |
| 1974 | table = nn_vrf->ctl_hdr->ctl_table_arg; |
| 1975 | unregister_net_sysctl_table(nn_vrf->ctl_hdr); |
| 1976 | kfree(table); |
| 1977 | } |
| 1978 | #else |
| 1979 | static int vrf_netns_init_sysctl(struct net *net, struct netns_vrf *nn_vrf) |
| 1980 | { |
| 1981 | return 0; |
| 1982 | } |
| 1983 | |
| 1984 | static void vrf_netns_exit_sysctl(struct net *net) |
| 1985 | { |
| 1986 | } |
| 1987 | #endif |
| 1988 | |
| 1989 | /* Initialize per network namespace state */ |
| 1990 | static int __net_init vrf_netns_init(struct net *net) |
| 1991 | { |
| 1992 | struct netns_vrf *nn_vrf = net_generic(net, vrf_net_id); |
| 1993 | |
| 1994 | nn_vrf->add_fib_rules = true; |
| 1995 | vrf_map_init(&nn_vrf->vmap); |
| 1996 | |
| 1997 | return vrf_netns_init_sysctl(net, nn_vrf); |
| 1998 | } |
| 1999 | |
| 2000 | static void __net_exit vrf_netns_exit(struct net *net) |
| 2001 | { |
| 2002 | vrf_netns_exit_sysctl(net); |
| 2003 | } |
| 2004 | |
| 2005 | static struct pernet_operations vrf_net_ops __net_initdata = { |
| 2006 | .init = vrf_netns_init, |
| 2007 | .exit = vrf_netns_exit, |
| 2008 | .id = &vrf_net_id, |
| 2009 | .size = sizeof(struct netns_vrf), |
| 2010 | }; |
| 2011 | |
| 2012 | static int __init vrf_init_module(void) |
| 2013 | { |
| 2014 | int rc; |
| 2015 | |
| 2016 | register_netdevice_notifier(&vrf_notifier_block); |
| 2017 | |
| 2018 | rc = register_pernet_subsys(&vrf_net_ops); |
| 2019 | if (rc < 0) |
| 2020 | goto error; |
| 2021 | |
| 2022 | rc = l3mdev_table_lookup_register(L3MDEV_TYPE_VRF, |
| 2023 | vrf_ifindex_lookup_by_table_id); |
| 2024 | if (rc < 0) |
| 2025 | goto unreg_pernet; |
| 2026 | |
| 2027 | rc = rtnl_link_register(&vrf_link_ops); |
| 2028 | if (rc < 0) |
| 2029 | goto table_lookup_unreg; |
| 2030 | |
| 2031 | return 0; |
| 2032 | |
| 2033 | table_lookup_unreg: |
| 2034 | l3mdev_table_lookup_unregister(L3MDEV_TYPE_VRF, |
| 2035 | vrf_ifindex_lookup_by_table_id); |
| 2036 | |
| 2037 | unreg_pernet: |
| 2038 | unregister_pernet_subsys(&vrf_net_ops); |
| 2039 | |
| 2040 | error: |
| 2041 | unregister_netdevice_notifier(&vrf_notifier_block); |
| 2042 | return rc; |
| 2043 | } |
| 2044 | |
| 2045 | module_init(vrf_init_module); |
| 2046 | MODULE_AUTHOR("Shrijeet Mukherjee, David Ahern"); |
| 2047 | MODULE_DESCRIPTION("Device driver to instantiate VRF domains"); |
| 2048 | MODULE_LICENSE("GPL"); |
| 2049 | MODULE_ALIAS_RTNL_LINK(DRV_NAME); |
| 2050 | MODULE_VERSION(DRV_VERSION); |