Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
193125db DA |
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 | |
193125db DA |
10 | */ |
11 | ||
cc69837f | 12 | #include <linux/ethtool.h> |
193125db DA |
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> | |
c8baec38 | 25 | #include <linux/spinlock_types.h> |
193125db DA |
26 | |
27 | #include <linux/inetdevice.h> | |
8f58336d | 28 | #include <net/arp.h> |
193125db DA |
29 | #include <net/ip.h> |
30 | #include <net/ip_fib.h> | |
35402e31 | 31 | #include <net/ip6_fib.h> |
193125db | 32 | #include <net/ip6_route.h> |
193125db DA |
33 | #include <net/route.h> |
34 | #include <net/addrconf.h> | |
ee15ee5d | 35 | #include <net/l3mdev.h> |
1aa6c4f6 | 36 | #include <net/fib_rules.h> |
097d3c95 | 37 | #include <net/netns/generic.h> |
193125db DA |
38 | |
39 | #define DRV_NAME "vrf" | |
c8baec38 | 40 | #define DRV_VERSION "1.1" |
193125db | 41 | |
1aa6c4f6 | 42 | #define FIB_RULE_PREF 1000 /* default preference for FIB rules */ |
097d3c95 | 43 | |
c8baec38 AM |
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 | ||
097d3c95 | 99 | static unsigned int vrf_net_id; |
1aa6c4f6 | 100 | |
c8baec38 AM |
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; | |
33306f1a | 107 | struct ctl_table_header *ctl_hdr; |
c8baec38 AM |
108 | }; |
109 | ||
ec539514 | 110 | struct net_vrf { |
b0e95ccd DA |
111 | struct rtable __rcu *rth; |
112 | struct rt6_info __rcu *rt6; | |
43b059a3 DA |
113 | #if IS_ENABLED(CONFIG_IPV6) |
114 | struct fib6_table *fib6_table; | |
115 | #endif | |
ec539514 | 116 | u32 tb_id; |
c8baec38 AM |
117 | |
118 | struct list_head me_list; /* entry in vrf_map_elem */ | |
119 | int ifindex; | |
ec539514 DA |
120 | }; |
121 | ||
193125db DA |
122 | struct pcpu_dstats { |
123 | u64 tx_pkts; | |
124 | u64 tx_bytes; | |
125 | u64 tx_drps; | |
126 | u64 rx_pkts; | |
127 | u64 rx_bytes; | |
afe80a49 | 128 | u64 rx_drps; |
193125db DA |
129 | struct u64_stats_sync syncp; |
130 | }; | |
131 | ||
afe80a49 DA |
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 | ||
57b8efa1 NA |
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 | ||
bc1f4470 | 148 | static void vrf_get_stats64(struct net_device *dev, |
149 | struct rtnl_link_stats64 *stats) | |
193125db DA |
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 | } | |
193125db DA |
173 | } |
174 | ||
c8baec38 AM |
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 | ||
a59a8ffd AM |
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 | ||
c8baec38 AM |
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 | ||
a59a8ffd AM |
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 | ||
dcdd43c4 DA |
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 | ||
afe80a49 DA |
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); | |
afe80a49 DA |
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 | ||
35402e31 | 427 | #if IS_ENABLED(CONFIG_IPV6) |
4c1feac5 DA |
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 | ||
35402e31 DA |
442 | static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb, |
443 | struct net_device *dev) | |
444 | { | |
107e47cc | 445 | const struct ipv6hdr *iph; |
35402e31 | 446 | struct net *net = dev_net(skb->dev); |
107e47cc | 447 | struct flowi6 fl6; |
35402e31 DA |
448 | int ret = NET_XMIT_DROP; |
449 | struct dst_entry *dst; | |
450 | struct dst_entry *dst_null = &net->ipv6.ip6_null_entry->dst; | |
451 | ||
107e47cc PK |
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 | ||
a53c1028 DA |
468 | dst = ip6_dst_lookup_flow(net, NULL, &fl6, NULL); |
469 | if (IS_ERR(dst) || dst == dst_null) | |
35402e31 DA |
470 | goto err; |
471 | ||
472 | skb_dst_drop(skb); | |
b4869aa2 | 473 | |
2e1534f3 ND |
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. | |
b4869aa2 | 476 | */ |
4f04256c DA |
477 | if (dst->dev == dev) |
478 | return vrf_local_xmit(skb, dev, dst); | |
b4869aa2 | 479 | |
35402e31 DA |
480 | skb_dst_set(skb, dst); |
481 | ||
911a66fb DA |
482 | /* strip the ethernet header added for pass through VRF device */ |
483 | __skb_pull(skb, skb_network_offset(skb)); | |
484 | ||
4c1feac5 | 485 | ret = vrf_ip6_local_out(net, skb->sk, skb); |
35402e31 DA |
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 | |
193125db DA |
497 | static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb, |
498 | struct net_device *dev) | |
499 | { | |
57b8efa1 NA |
500 | vrf_tx_error(dev, skb); |
501 | return NET_XMIT_DROP; | |
193125db | 502 | } |
35402e31 | 503 | #endif |
193125db | 504 | |
ebfc102c DA |
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 | ||
193125db DA |
519 | static netdev_tx_t vrf_process_v4_outbound(struct sk_buff *skb, |
520 | struct net_device *vrf_dev) | |
521 | { | |
107e47cc | 522 | struct iphdr *ip4h; |
193125db | 523 | int ret = NET_XMIT_DROP; |
107e47cc | 524 | struct flowi4 fl4; |
911a66fb DA |
525 | struct net *net = dev_net(vrf_dev); |
526 | struct rtable *rt; | |
527 | ||
107e47cc PK |
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 | ||
911a66fb DA |
543 | rt = ip_route_output_flow(net, &fl4, NULL); |
544 | if (IS_ERR(rt)) | |
545 | goto err; | |
193125db | 546 | |
911a66fb | 547 | skb_dst_drop(skb); |
afe80a49 | 548 | |
2e1534f3 ND |
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. | |
afe80a49 | 551 | */ |
4f04256c DA |
552 | if (rt->dst.dev == vrf_dev) |
553 | return vrf_local_xmit(skb, vrf_dev, &rt->dst); | |
afe80a49 | 554 | |
911a66fb DA |
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)); | |
193125db DA |
559 | |
560 | if (!ip4h->saddr) { | |
561 | ip4h->saddr = inet_select_addr(skb_dst(skb)->dev, 0, | |
562 | RT_SCOPE_LINK); | |
563 | } | |
564 | ||
ebfc102c | 565 | ret = vrf_ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb); |
193125db DA |
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: | |
57b8efa1 | 574 | vrf_tx_error(vrf_dev, skb); |
193125db DA |
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: | |
57b8efa1 | 586 | vrf_tx_error(dev, skb); |
193125db DA |
587 | return NET_XMIT_DROP; |
588 | } | |
589 | } | |
590 | ||
591 | static netdev_tx_t vrf_xmit(struct sk_buff *skb, struct net_device *dev) | |
592 | { | |
f7887d40 | 593 | int len = skb->len; |
193125db DA |
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++; | |
f7887d40 | 601 | dstats->tx_bytes += len; |
193125db DA |
602 | u64_stats_update_end(&dstats->syncp); |
603 | } else { | |
604 | this_cpu_inc(dev->dstats->tx_drps); | |
605 | } | |
606 | ||
607 | return ret; | |
608 | } | |
609 | ||
9e2b7fa2 | 610 | static void vrf_finish_direct(struct sk_buff *skb) |
dcdd43c4 DA |
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)) { | |
d58ff351 | 616 | struct ethhdr *eth = skb_push(skb, ETH_HLEN); |
dcdd43c4 DA |
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 | ||
9e2b7fa2 MW |
629 | /* reset skb device */ |
630 | nf_reset_ct(skb); | |
dcdd43c4 DA |
631 | } |
632 | ||
35402e31 | 633 | #if IS_ENABLED(CONFIG_IPV6) |
35402e31 DA |
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; | |
9b1c1ef1 | 640 | const struct in6_addr *nexthop; |
35402e31 | 641 | struct neighbour *neigh; |
35402e31 DA |
642 | int ret; |
643 | ||
895b5c9f | 644 | nf_reset_ct(skb); |
eb63ecc1 | 645 | |
35402e31 DA |
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)) { | |
4ff06203 | 655 | sock_confirm_neigh(skb, neigh); |
0353f282 | 656 | ret = neigh_output(neigh, skb, false); |
35402e31 DA |
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 | ||
4c1feac5 DA |
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 | */ | |
a9ec54d1 DA |
681 | static struct sk_buff *vrf_ip6_out_redirect(struct net_device *vrf_dev, |
682 | struct sk_buff *skb) | |
4c1feac5 DA |
683 | { |
684 | struct net_vrf *vrf = netdev_priv(vrf_dev); | |
685 | struct dst_entry *dst = NULL; | |
686 | struct rt6_info *rt6; | |
687 | ||
4c1feac5 DA |
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 | ||
9e2b7fa2 MW |
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 | ||
a9ec54d1 DA |
717 | static int vrf_output6_direct(struct net *net, struct sock *sk, |
718 | struct sk_buff *skb) | |
719 | { | |
9e2b7fa2 MW |
720 | int err = 1; |
721 | ||
a9ec54d1 DA |
722 | skb->protocol = htons(ETH_P_IPV6); |
723 | ||
9e2b7fa2 MW |
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; | |
a9ec54d1 DA |
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, | |
9e2b7fa2 | 756 | skb, NULL, vrf_dev, vrf_ip6_out_direct_finish); |
a9ec54d1 DA |
757 | |
758 | if (likely(err == 1)) | |
759 | err = vrf_output6_direct(net, sk, skb); | |
760 | ||
a9ec54d1 | 761 | if (likely(err == 1)) |
9e2b7fa2 | 762 | return skb; |
a9ec54d1 | 763 | |
9e2b7fa2 | 764 | return NULL; |
a9ec54d1 DA |
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 | ||
16b9db1c DA |
775 | if (qdisc_tx_is_default(vrf_dev) || |
776 | IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED) | |
a9ec54d1 DA |
777 | return vrf_ip6_out_direct(vrf_dev, sk, skb); |
778 | ||
779 | return vrf_ip6_out_redirect(vrf_dev, skb); | |
780 | } | |
781 | ||
b0e95ccd | 782 | /* holding rtnl */ |
810e530b | 783 | static void vrf_rt6_release(struct net_device *dev, struct net_vrf *vrf) |
35402e31 | 784 | { |
b0e95ccd | 785 | struct rt6_info *rt6 = rtnl_dereference(vrf->rt6); |
810e530b DA |
786 | struct net *net = dev_net(dev); |
787 | struct dst_entry *dst; | |
b0e95ccd | 788 | |
b4869aa2 | 789 | RCU_INIT_POINTER(vrf->rt6, NULL); |
b4869aa2 | 790 | synchronize_rcu(); |
b0e95ccd | 791 | |
810e530b DA |
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 | } | |
35402e31 DA |
802 | } |
803 | ||
804 | static int vrf_rt6_create(struct net_device *dev) | |
805 | { | |
af13b3c3 | 806 | int flags = DST_NOPOLICY | DST_NOXFRM; |
35402e31 | 807 | struct net_vrf *vrf = netdev_priv(dev); |
9ab179d8 | 808 | struct net *net = dev_net(dev); |
4f04256c | 809 | struct rt6_info *rt6; |
35402e31 DA |
810 | int rc = -ENOMEM; |
811 | ||
e4348637 DA |
812 | /* IPv6 can be CONFIG enabled and then disabled runtime */ |
813 | if (!ipv6_mod_enabled()) | |
814 | return 0; | |
815 | ||
43b059a3 DA |
816 | vrf->fib6_table = fib6_new_table(net, vrf->tb_id); |
817 | if (!vrf->fib6_table) | |
b3b4663c DA |
818 | goto out; |
819 | ||
b4869aa2 DA |
820 | /* create a dst for routing packets out a VRF device */ |
821 | rt6 = ip6_dst_alloc(net, dev, flags); | |
35402e31 DA |
822 | if (!rt6) |
823 | goto out; | |
824 | ||
b3b4663c | 825 | rt6->dst.output = vrf_output6; |
b4869aa2 | 826 | |
b0e95ccd DA |
827 | rcu_assign_pointer(vrf->rt6, rt6); |
828 | ||
35402e31 DA |
829 | rc = 0; |
830 | out: | |
831 | return rc; | |
832 | } | |
833 | #else | |
4c1feac5 DA |
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 | ||
810e530b | 841 | static void vrf_rt6_release(struct net_device *dev, struct net_vrf *vrf) |
35402e31 DA |
842 | { |
843 | } | |
844 | ||
845 | static int vrf_rt6_create(struct net_device *dev) | |
846 | { | |
847 | return 0; | |
848 | } | |
849 | #endif | |
850 | ||
8f58336d | 851 | /* modelled after ip_finish_output2 */ |
0c4b51f0 | 852 | static int vrf_finish_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
193125db | 853 | { |
8f58336d DA |
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; | |
5c9f7c1d | 859 | bool is_v6gw = false; |
8f58336d DA |
860 | int ret = -EINVAL; |
861 | ||
895b5c9f | 862 | nf_reset_ct(skb); |
eb63ecc1 | 863 | |
8f58336d DA |
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 | ||
5c9f7c1d | 882 | neigh = ip_neigh_for_gw(rt, skb, &is_v6gw); |
4ff06203 JA |
883 | if (!IS_ERR(neigh)) { |
884 | sock_confirm_neigh(skb, neigh); | |
5c9f7c1d DA |
885 | /* if crossing protocols, can not use the cached header */ |
886 | ret = neigh_output(neigh, skb, is_v6gw); | |
82dd0d2a DA |
887 | rcu_read_unlock_bh(); |
888 | return ret; | |
4ff06203 | 889 | } |
8f58336d DA |
890 | |
891 | rcu_read_unlock_bh(); | |
892 | err: | |
82dd0d2a | 893 | vrf_tx_error(skb->dev, skb); |
8f58336d | 894 | return ret; |
193125db DA |
895 | } |
896 | ||
ede2059d | 897 | static int vrf_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
193125db DA |
898 | { |
899 | struct net_device *dev = skb_dst(skb)->dev; | |
900 | ||
29a26a56 | 901 | IP_UPD_PO_STATS(net, IPSTATS_MIB_OUT, skb->len); |
193125db DA |
902 | |
903 | skb->dev = dev; | |
904 | skb->protocol = htons(ETH_P_IP); | |
905 | ||
29a26a56 EB |
906 | return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING, |
907 | net, sk, skb, NULL, dev, | |
8f58336d | 908 | vrf_finish_output, |
193125db DA |
909 | !(IPCB(skb)->flags & IPSKB_REROUTED)); |
910 | } | |
911 | ||
ebfc102c DA |
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 | */ | |
dcdd43c4 DA |
916 | static struct sk_buff *vrf_ip_out_redirect(struct net_device *vrf_dev, |
917 | struct sk_buff *skb) | |
ebfc102c DA |
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 | ||
9e2b7fa2 MW |
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 | ||
dcdd43c4 DA |
952 | static int vrf_output_direct(struct net *net, struct sock *sk, |
953 | struct sk_buff *skb) | |
954 | { | |
9e2b7fa2 MW |
955 | int err = 1; |
956 | ||
dcdd43c4 DA |
957 | skb->protocol = htons(ETH_P_IP); |
958 | ||
9e2b7fa2 MW |
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; | |
dcdd43c4 DA |
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, | |
9e2b7fa2 | 991 | skb, NULL, vrf_dev, vrf_ip_out_direct_finish); |
dcdd43c4 DA |
992 | |
993 | if (likely(err == 1)) | |
994 | err = vrf_output_direct(net, sk, skb); | |
995 | ||
dcdd43c4 | 996 | if (likely(err == 1)) |
9e2b7fa2 | 997 | return skb; |
dcdd43c4 | 998 | |
9e2b7fa2 | 999 | return NULL; |
dcdd43c4 DA |
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 | { | |
1e19c4d6 DA |
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)) | |
dcdd43c4 DA |
1009 | return skb; |
1010 | ||
16b9db1c DA |
1011 | if (qdisc_tx_is_default(vrf_dev) || |
1012 | IPCB(skb)->flags & IPSKB_XFRM_TRANSFORMED) | |
dcdd43c4 DA |
1013 | return vrf_ip_out_direct(vrf_dev, sk, skb); |
1014 | ||
1015 | return vrf_ip_out_redirect(vrf_dev, skb); | |
1016 | } | |
1017 | ||
ebfc102c DA |
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); | |
4c1feac5 DA |
1027 | case AF_INET6: |
1028 | return vrf_ip6_out(vrf_dev, sk, skb); | |
ebfc102c DA |
1029 | } |
1030 | ||
1031 | return skb; | |
1032 | } | |
1033 | ||
b0e95ccd | 1034 | /* holding rtnl */ |
810e530b | 1035 | static void vrf_rtable_release(struct net_device *dev, struct net_vrf *vrf) |
193125db | 1036 | { |
b0e95ccd | 1037 | struct rtable *rth = rtnl_dereference(vrf->rth); |
810e530b DA |
1038 | struct net *net = dev_net(dev); |
1039 | struct dst_entry *dst; | |
b0e95ccd | 1040 | |
afe80a49 | 1041 | RCU_INIT_POINTER(vrf->rth, NULL); |
afe80a49 | 1042 | synchronize_rcu(); |
193125db | 1043 | |
810e530b DA |
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 | } | |
193125db DA |
1054 | } |
1055 | ||
b0e95ccd | 1056 | static int vrf_rtable_create(struct net_device *dev) |
193125db | 1057 | { |
b7503e0c | 1058 | struct net_vrf *vrf = netdev_priv(dev); |
4f04256c | 1059 | struct rtable *rth; |
193125db | 1060 | |
b3b4663c | 1061 | if (!fib_new_table(dev_net(dev), vrf->tb_id)) |
b0e95ccd | 1062 | return -ENOMEM; |
b3b4663c | 1063 | |
afe80a49 | 1064 | /* create a dst for routing packets out through a VRF device */ |
af13b3c3 | 1065 | rth = rt_dst_alloc(dev, 0, RTN_UNICAST, 1, 1); |
b0e95ccd DA |
1066 | if (!rth) |
1067 | return -ENOMEM; | |
193125db | 1068 | |
b0e95ccd | 1069 | rth->dst.output = vrf_output; |
b0e95ccd DA |
1070 | |
1071 | rcu_assign_pointer(vrf->rth, rth); | |
1072 | ||
1073 | return 0; | |
193125db DA |
1074 | } |
1075 | ||
1076 | /**************************** device handling ********************/ | |
1077 | ||
1078 | /* cycle interface to flush neighbor cache and move routes across tables */ | |
dc1aea1e PM |
1079 | static void cycle_netdev(struct net_device *dev, |
1080 | struct netlink_ext_ack *extack) | |
193125db DA |
1081 | { |
1082 | unsigned int flags = dev->flags; | |
1083 | int ret; | |
1084 | ||
1085 | if (!netif_running(dev)) | |
1086 | return; | |
1087 | ||
567c5e13 | 1088 | ret = dev_change_flags(dev, flags & ~IFF_UP, extack); |
193125db | 1089 | if (ret >= 0) |
567c5e13 | 1090 | ret = dev_change_flags(dev, flags, extack); |
193125db DA |
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 | ||
42ab19ee DA |
1099 | static int do_vrf_add_slave(struct net_device *dev, struct net_device *port_dev, |
1100 | struct netlink_ext_ack *extack) | |
193125db | 1101 | { |
bad53162 | 1102 | int ret; |
193125db | 1103 | |
26d31ac1 DA |
1104 | /* do not allow loopback device to be enslaved to a VRF. |
1105 | * The vrf device acts as the loopback for the vrf. | |
1106 | */ | |
de3baa3e DA |
1107 | if (port_dev == dev_net(dev)->loopback_dev) { |
1108 | NL_SET_ERR_MSG(extack, | |
1109 | "Can not enslave loopback device to a VRF"); | |
26d31ac1 | 1110 | return -EOPNOTSUPP; |
de3baa3e | 1111 | } |
26d31ac1 | 1112 | |
fdeea7be | 1113 | port_dev->priv_flags |= IFF_L3MDEV_SLAVE; |
42ab19ee | 1114 | ret = netdev_master_upper_dev_link(port_dev, dev, NULL, NULL, extack); |
193125db | 1115 | if (ret < 0) |
fdeea7be | 1116 | goto err; |
193125db | 1117 | |
dc1aea1e | 1118 | cycle_netdev(port_dev, extack); |
193125db DA |
1119 | |
1120 | return 0; | |
fdeea7be IS |
1121 | |
1122 | err: | |
1123 | port_dev->priv_flags &= ~IFF_L3MDEV_SLAVE; | |
1124 | return ret; | |
193125db DA |
1125 | } |
1126 | ||
33eaf2a6 DA |
1127 | static int vrf_add_slave(struct net_device *dev, struct net_device *port_dev, |
1128 | struct netlink_ext_ack *extack) | |
193125db | 1129 | { |
de3baa3e DA |
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)) | |
193125db DA |
1137 | return -EINVAL; |
1138 | ||
42ab19ee | 1139 | return do_vrf_add_slave(dev, port_dev, extack); |
193125db DA |
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 | { | |
193125db | 1145 | netdev_upper_dev_unlink(port_dev, dev); |
fee6d4c7 | 1146 | port_dev->priv_flags &= ~IFF_L3MDEV_SLAVE; |
193125db | 1147 | |
dc1aea1e | 1148 | cycle_netdev(port_dev, NULL); |
193125db | 1149 | |
193125db DA |
1150 | return 0; |
1151 | } | |
1152 | ||
1153 | static int vrf_del_slave(struct net_device *dev, struct net_device *port_dev) | |
1154 | { | |
193125db DA |
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); | |
193125db | 1161 | |
810e530b DA |
1162 | vrf_rtable_release(dev, vrf); |
1163 | vrf_rt6_release(dev, vrf); | |
193125db | 1164 | |
3a4a27d3 | 1165 | free_percpu(dev->dstats); |
193125db DA |
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 | ||
193125db DA |
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 */ | |
b0e95ccd | 1178 | if (vrf_rtable_create(dev) != 0) |
193125db DA |
1179 | goto out_stats; |
1180 | ||
35402e31 DA |
1181 | if (vrf_rt6_create(dev) != 0) |
1182 | goto out_rth; | |
1183 | ||
193125db DA |
1184 | dev->flags = IFF_MASTER | IFF_NOARP; |
1185 | ||
b87ab6b8 DA |
1186 | /* similarly, oper state is irrelevant; set to up to avoid confusion */ |
1187 | dev->operstate = IF_OPER_UP; | |
1a33e10e | 1188 | netdev_lockdep_set_classes(dev); |
193125db DA |
1189 | return 0; |
1190 | ||
35402e31 | 1191 | out_rth: |
810e530b | 1192 | vrf_rtable_release(dev, vrf); |
193125db DA |
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, | |
6819e3f6 | 1204 | .ndo_set_mac_address = eth_mac_addr, |
193125db DA |
1205 | .ndo_get_stats64 = vrf_get_stats64, |
1206 | .ndo_add_slave = vrf_add_slave, | |
1207 | .ndo_del_slave = vrf_del_slave, | |
1208 | }; | |
1209 | ||
ee15ee5d DA |
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 | ||
73e20b76 DA |
1217 | static int vrf_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb) |
1218 | { | |
1a4a5bf5 | 1219 | kfree_skb(skb); |
73e20b76 DA |
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 | ||
1a4a5bf5 | 1229 | if (nf_hook(pf, hook, net, NULL, skb, dev, NULL, vrf_rcv_finish) != 1) |
73e20b76 DA |
1230 | skb = NULL; /* kfree_skb(skb) handled by nf code */ |
1231 | ||
1232 | return skb; | |
1233 | } | |
1234 | ||
9125abe7 AM |
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 | ||
74b20582 DA |
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 | ||
9ff74384 DA |
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, | |
b75cc8f9 | 1329 | const struct sk_buff *skb, |
9ff74384 DA |
1330 | int flags) |
1331 | { | |
1332 | struct net_vrf *vrf = netdev_priv(dev); | |
9ff74384 | 1333 | |
43b059a3 | 1334 | return ip6_pol_route(net, vrf->fib6_table, ifindex, fl6, skb, flags); |
9ff74384 DA |
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 = { | |
ecf09117 AB |
1342 | .flowi6_iif = ifindex, |
1343 | .flowi6_mark = skb->mark, | |
1344 | .flowi6_proto = iph->nexthdr, | |
9ff74384 DA |
1345 | .daddr = iph->daddr, |
1346 | .saddr = iph->saddr, | |
1347 | .flowlabel = ip6_flowinfo(iph), | |
9ff74384 DA |
1348 | }; |
1349 | struct net *net = dev_net(vrf_dev); | |
1350 | struct rt6_info *rt6; | |
1351 | ||
b75cc8f9 | 1352 | rt6 = vrf_ip6_route_lookup(net, vrf_dev, &fl6, ifindex, skb, |
9ff74384 DA |
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 | ||
74b20582 DA |
1363 | static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev, |
1364 | struct sk_buff *skb) | |
1365 | { | |
9ff74384 | 1366 | int orig_iif = skb->skb_iif; |
6f12fa77 MM |
1367 | bool need_strict = rt6_need_strict(&ipv6_hdr(skb)->daddr); |
1368 | bool is_ndisc = ipv6_ndisc_frame(skb); | |
205704c6 | 1369 | bool is_ll_src; |
9ff74384 | 1370 | |
6f12fa77 | 1371 | /* loopback, multicast & non-ND link-local traffic; do not push through |
205704c6 SS |
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 | |
b4869aa2 | 1376 | */ |
205704c6 SS |
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)) { | |
b4869aa2 DA |
1380 | skb->dev = vrf_dev; |
1381 | skb->skb_iif = vrf_dev->ifindex; | |
a04a480d | 1382 | IP6CB(skb)->flags |= IP6SKB_L3SLAVE; |
6f12fa77 MM |
1383 | if (skb->pkt_type == PACKET_LOOPBACK) |
1384 | skb->pkt_type = PACKET_HOST; | |
b4869aa2 DA |
1385 | goto out; |
1386 | } | |
1387 | ||
6f12fa77 MM |
1388 | /* if packet is NDISC then keep the ingress interface */ |
1389 | if (!is_ndisc) { | |
926d93a3 | 1390 | vrf_rx_stats(vrf_dev, skb->len); |
74b20582 DA |
1391 | skb->dev = vrf_dev; |
1392 | skb->skb_iif = vrf_dev->ifindex; | |
1393 | ||
a9ec54d1 | 1394 | if (!list_empty(&vrf_dev->ptype_all)) { |
04893908 AM |
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 | } | |
a9ec54d1 | 1404 | } |
74b20582 DA |
1405 | |
1406 | IP6CB(skb)->flags |= IP6SKB_L3SLAVE; | |
1407 | } | |
1408 | ||
9ff74384 DA |
1409 | if (need_strict) |
1410 | vrf_ip6_input_dst(skb, vrf_dev, orig_iif); | |
1411 | ||
73e20b76 | 1412 | skb = vrf_rcv_nfhook(NFPROTO_IPV6, NF_INET_PRE_ROUTING, skb, vrf_dev); |
b4869aa2 | 1413 | out: |
74b20582 DA |
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; | |
a04a480d | 1430 | IPCB(skb)->flags |= IPSKB_L3SLAVE; |
74b20582 | 1431 | |
e58e4159 DA |
1432 | if (ipv4_is_multicast(ip_hdr(skb)->daddr)) |
1433 | goto out; | |
1434 | ||
afe80a49 DA |
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 | ||
926d93a3 DA |
1443 | vrf_rx_stats(vrf_dev, skb->len); |
1444 | ||
dcdd43c4 | 1445 | if (!list_empty(&vrf_dev->ptype_all)) { |
04893908 AM |
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 | } | |
dcdd43c4 | 1454 | } |
74b20582 | 1455 | |
73e20b76 | 1456 | skb = vrf_rcv_nfhook(NFPROTO_IPV4, NF_INET_PRE_ROUTING, skb, vrf_dev); |
afe80a49 | 1457 | out: |
74b20582 DA |
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 | ||
35402e31 | 1476 | #if IS_ENABLED(CONFIG_IPV6) |
4c1feac5 DA |
1477 | /* send to link-local or multicast address via interface enslaved to |
1478 | * VRF device. Force lookup to VRF table without changing flow struct | |
7d9e5f42 WW |
1479 | * Note: Caller to this function must hold rcu_read_lock() and no refcnt |
1480 | * is taken on the dst by this function. | |
4c1feac5 DA |
1481 | */ |
1482 | static struct dst_entry *vrf_link_scope_lookup(const struct net_device *dev, | |
1483 | struct flowi6 *fl6) | |
35402e31 | 1484 | { |
9ff74384 | 1485 | struct net *net = dev_net(dev); |
7d9e5f42 | 1486 | int flags = RT6_LOOKUP_F_IFACE | RT6_LOOKUP_F_DST_NOREF; |
b0e95ccd | 1487 | struct dst_entry *dst = NULL; |
9ff74384 | 1488 | struct rt6_info *rt; |
35402e31 | 1489 | |
4c1feac5 DA |
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; | |
4c1feac5 | 1496 | return dst; |
35402e31 DA |
1497 | } |
1498 | ||
4c1feac5 DA |
1499 | if (!ipv6_addr_any(&fl6->saddr)) |
1500 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
1501 | ||
b75cc8f9 | 1502 | rt = vrf_ip6_route_lookup(net, dev, fl6, fl6->flowi6_oif, NULL, flags); |
4c1feac5 DA |
1503 | if (rt) |
1504 | dst = &rt->dst; | |
9ff74384 | 1505 | |
b0e95ccd | 1506 | return dst; |
35402e31 DA |
1507 | } |
1508 | #endif | |
1509 | ||
ee15ee5d DA |
1510 | static const struct l3mdev_ops vrf_l3mdev_ops = { |
1511 | .l3mdev_fib_table = vrf_fib_table, | |
74b20582 | 1512 | .l3mdev_l3_rcv = vrf_l3_rcv, |
ebfc102c | 1513 | .l3mdev_l3_out = vrf_l3_out, |
35402e31 | 1514 | #if IS_ENABLED(CONFIG_IPV6) |
4c1feac5 | 1515 | .l3mdev_link_scope_lookup = vrf_link_scope_lookup, |
35402e31 | 1516 | #endif |
ee15ee5d DA |
1517 | }; |
1518 | ||
193125db DA |
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 | ||
1aa6c4f6 DA |
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 */ | |
1b71af60 | 1537 | sz += nla_total_size(sizeof(u8)); /* FRA_PROTOCOL */ |
1aa6c4f6 DA |
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 | ||
dac91170 DA |
1549 | if ((family == AF_INET6 || family == RTNL_FAMILY_IP6MR) && |
1550 | !ipv6_mod_enabled()) | |
e4348637 DA |
1551 | return 0; |
1552 | ||
1aa6c4f6 DA |
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 */ | |
426c87ca | 1562 | nlh->nlmsg_flags |= NLM_F_EXCL; |
1aa6c4f6 DA |
1563 | |
1564 | frh = nlmsg_data(nlh); | |
1565 | memset(frh, 0, sizeof(*frh)); | |
1566 | frh->family = family; | |
1567 | frh->action = FR_ACT_TO_TBL; | |
1b71af60 DS |
1568 | |
1569 | if (nla_put_u8(skb, FRA_PROTOCOL, RTPROT_KERNEL)) | |
1570 | goto nla_put_failure; | |
1aa6c4f6 | 1571 | |
18129a24 | 1572 | if (nla_put_u8(skb, FRA_L3MDEV, 1)) |
1aa6c4f6 DA |
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) { | |
c21ef3e3 | 1583 | err = fib_nl_newrule(skb, nlh, NULL); |
1aa6c4f6 DA |
1584 | if (err == -EEXIST) |
1585 | err = 0; | |
1586 | } else { | |
c21ef3e3 | 1587 | err = fib_nl_delrule(skb, nlh, NULL); |
1aa6c4f6 DA |
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 | ||
e58e4159 DA |
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 | ||
e4a38c0c PR |
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 | ||
1aa6c4f6 DA |
1625 | return 0; |
1626 | ||
e4a38c0c PR |
1627 | #if IS_ENABLED(CONFIG_IPV6_MROUTE_MULTIPLE_TABLES) |
1628 | ip6mr_err: | |
1629 | vrf_fib_rule(dev, RTNL_FAMILY_IPMR, false); | |
1630 | #endif | |
1631 | ||
e58e4159 DA |
1632 | #if IS_ENABLED(CONFIG_IP_MROUTE_MULTIPLE_TABLES) |
1633 | ipmr_err: | |
1634 | vrf_fib_rule(dev, AF_INET6, false); | |
1635 | #endif | |
1636 | ||
1aa6c4f6 DA |
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 | ||
193125db DA |
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; | |
ee15ee5d | 1651 | dev->l3mdev_ops = &vrf_l3mdev_ops; |
193125db | 1652 | dev->ethtool_ops = &vrf_ethtool_ops; |
cf124db5 | 1653 | dev->needs_free_netdev = true; |
193125db DA |
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; | |
7889681f DA |
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; | |
cb160394 | 1669 | dev->features |= NETIF_F_RXCSUM | NETIF_F_HW_CSUM | NETIF_F_SCTP_CRC; |
7889681f DA |
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; | |
1017e098 | 1677 | dev->priv_flags |= IFF_NO_RX_HANDLER; |
6819e3f6 | 1678 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
ad49bc63 | 1679 | |
5055376a ML |
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; | |
9bb392f6 ND |
1685 | dev->max_mtu = IP6_MAX_MTU; |
1686 | dev->mtu = dev->max_mtu; | |
193125db DA |
1687 | } |
1688 | ||
a8b8a889 MS |
1689 | static int vrf_validate(struct nlattr *tb[], struct nlattr *data[], |
1690 | struct netlink_ext_ack *extack) | |
193125db DA |
1691 | { |
1692 | if (tb[IFLA_ADDRESS]) { | |
53b94835 DA |
1693 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) { |
1694 | NL_SET_ERR_MSG(extack, "Invalid hardware address"); | |
193125db | 1695 | return -EINVAL; |
53b94835 DA |
1696 | } |
1697 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) { | |
1698 | NL_SET_ERR_MSG(extack, "Invalid hardware address"); | |
193125db | 1699 | return -EADDRNOTAVAIL; |
53b94835 | 1700 | } |
193125db DA |
1701 | } |
1702 | return 0; | |
1703 | } | |
1704 | ||
1705 | static void vrf_dellink(struct net_device *dev, struct list_head *head) | |
1706 | { | |
f630c38e NA |
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 | ||
c8baec38 AM |
1713 | vrf_map_unregister_dev(dev); |
1714 | ||
193125db DA |
1715 | unregister_netdevice_queue(dev, head); |
1716 | } | |
1717 | ||
1718 | static int vrf_newlink(struct net *src_net, struct net_device *dev, | |
7a3f4a18 MS |
1719 | struct nlattr *tb[], struct nlattr *data[], |
1720 | struct netlink_ext_ack *extack) | |
193125db DA |
1721 | { |
1722 | struct net_vrf *vrf = netdev_priv(dev); | |
c8baec38 | 1723 | struct netns_vrf *nn_vrf; |
097d3c95 DA |
1724 | bool *add_fib_rules; |
1725 | struct net *net; | |
1aa6c4f6 | 1726 | int err; |
193125db | 1727 | |
53b94835 DA |
1728 | if (!data || !data[IFLA_VRF_TABLE]) { |
1729 | NL_SET_ERR_MSG(extack, "VRF table id is missing"); | |
193125db | 1730 | return -EINVAL; |
53b94835 | 1731 | } |
193125db DA |
1732 | |
1733 | vrf->tb_id = nla_get_u32(data[IFLA_VRF_TABLE]); | |
53b94835 DA |
1734 | if (vrf->tb_id == RT_TABLE_UNSPEC) { |
1735 | NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VRF_TABLE], | |
1736 | "Invalid VRF table id"); | |
24c63bbc | 1737 | return -EINVAL; |
53b94835 | 1738 | } |
193125db | 1739 | |
007979ea | 1740 | dev->priv_flags |= IFF_L3MDEV_MASTER; |
193125db | 1741 | |
1aa6c4f6 DA |
1742 | err = register_netdevice(dev); |
1743 | if (err) | |
1744 | goto out; | |
1745 | ||
c8baec38 AM |
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 | ||
097d3c95 | 1758 | net = dev_net(dev); |
c8baec38 AM |
1759 | nn_vrf = net_generic(net, vrf_net_id); |
1760 | ||
1761 | add_fib_rules = &nn_vrf->add_fib_rules; | |
097d3c95 | 1762 | if (*add_fib_rules) { |
1aa6c4f6 DA |
1763 | err = vrf_add_fib_rules(dev); |
1764 | if (err) { | |
c8baec38 | 1765 | vrf_map_unregister_dev(dev); |
1aa6c4f6 DA |
1766 | unregister_netdevice(dev); |
1767 | goto out; | |
1768 | } | |
097d3c95 | 1769 | *add_fib_rules = false; |
1aa6c4f6 DA |
1770 | } |
1771 | ||
1772 | out: | |
1773 | return err; | |
193125db DA |
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 | ||
67eb0331 DA |
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 | ||
193125db DA |
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 | ||
67eb0331 DA |
1820 | .get_slave_size = vrf_get_slave_size, |
1821 | .fill_slave_info = vrf_fill_slave_info, | |
1822 | ||
193125db DA |
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) { | |
193125db DA |
1836 | struct net_device *vrf_dev; |
1837 | ||
fee6d4c7 | 1838 | if (!netif_is_l3_slave(dev)) |
193125db DA |
1839 | goto out; |
1840 | ||
58aa9087 NA |
1841 | vrf_dev = netdev_master_upper_dev_get(dev); |
1842 | vrf_del_slave(vrf_dev, dev); | |
193125db DA |
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 | ||
c8baec38 AM |
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 | ||
1b6687e3 DA |
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 | ||
33306f1a AM |
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 | ||
1b6687e3 | 1949 | static int vrf_netns_init_sysctl(struct net *net, struct netns_vrf *nn_vrf) |
097d3c95 | 1950 | { |
33306f1a | 1951 | struct ctl_table *table; |
097d3c95 | 1952 | |
33306f1a AM |
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) { | |
1b6687e3 DA |
1962 | kfree(table); |
1963 | return -ENOMEM; | |
33306f1a AM |
1964 | } |
1965 | ||
097d3c95 | 1966 | return 0; |
33306f1a AM |
1967 | } |
1968 | ||
1b6687e3 | 1969 | static void vrf_netns_exit_sysctl(struct net *net) |
33306f1a AM |
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); | |
097d3c95 | 1977 | } |
1b6687e3 DA |
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 | } | |
097d3c95 DA |
2004 | |
2005 | static struct pernet_operations vrf_net_ops __net_initdata = { | |
2006 | .init = vrf_netns_init, | |
33306f1a | 2007 | .exit = vrf_netns_exit, |
097d3c95 | 2008 | .id = &vrf_net_id, |
c8baec38 | 2009 | .size = sizeof(struct netns_vrf), |
097d3c95 DA |
2010 | }; |
2011 | ||
193125db DA |
2012 | static int __init vrf_init_module(void) |
2013 | { | |
2014 | int rc; | |
2015 | ||
193125db DA |
2016 | register_netdevice_notifier(&vrf_notifier_block); |
2017 | ||
097d3c95 | 2018 | rc = register_pernet_subsys(&vrf_net_ops); |
193125db DA |
2019 | if (rc < 0) |
2020 | goto error; | |
2021 | ||
a59a8ffd AM |
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 | ||
097d3c95 | 2027 | rc = rtnl_link_register(&vrf_link_ops); |
a59a8ffd AM |
2028 | if (rc < 0) |
2029 | goto table_lookup_unreg; | |
097d3c95 | 2030 | |
193125db DA |
2031 | return 0; |
2032 | ||
a59a8ffd AM |
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 | ||
193125db DA |
2040 | error: |
2041 | unregister_netdevice_notifier(&vrf_notifier_block); | |
193125db DA |
2042 | return rc; |
2043 | } | |
2044 | ||
193125db | 2045 | module_init(vrf_init_module); |
193125db DA |
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); |