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 DA |
473 | |
474 | /* if dst.dev is loopback or the VRF device again this is locally | |
475 | * originated traffic destined to a local address. Short circuit | |
4f04256c | 476 | * to Rx path |
b4869aa2 | 477 | */ |
4f04256c DA |
478 | if (dst->dev == dev) |
479 | return vrf_local_xmit(skb, dev, dst); | |
b4869aa2 | 480 | |
35402e31 DA |
481 | skb_dst_set(skb, dst); |
482 | ||
911a66fb DA |
483 | /* strip the ethernet header added for pass through VRF device */ |
484 | __skb_pull(skb, skb_network_offset(skb)); | |
485 | ||
4c1feac5 | 486 | ret = vrf_ip6_local_out(net, skb->sk, skb); |
35402e31 DA |
487 | if (unlikely(net_xmit_eval(ret))) |
488 | dev->stats.tx_errors++; | |
489 | else | |
490 | ret = NET_XMIT_SUCCESS; | |
491 | ||
492 | return ret; | |
493 | err: | |
494 | vrf_tx_error(dev, skb); | |
495 | return NET_XMIT_DROP; | |
496 | } | |
497 | #else | |
193125db DA |
498 | static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb, |
499 | struct net_device *dev) | |
500 | { | |
57b8efa1 NA |
501 | vrf_tx_error(dev, skb); |
502 | return NET_XMIT_DROP; | |
193125db | 503 | } |
35402e31 | 504 | #endif |
193125db | 505 | |
ebfc102c DA |
506 | /* based on ip_local_out; can't use it b/c the dst is switched pointing to us */ |
507 | static int vrf_ip_local_out(struct net *net, struct sock *sk, | |
508 | struct sk_buff *skb) | |
509 | { | |
510 | int err; | |
511 | ||
512 | err = nf_hook(NFPROTO_IPV4, NF_INET_LOCAL_OUT, net, sk, | |
513 | skb, NULL, skb_dst(skb)->dev, dst_output); | |
514 | if (likely(err == 1)) | |
515 | err = dst_output(net, sk, skb); | |
516 | ||
517 | return err; | |
518 | } | |
519 | ||
193125db DA |
520 | static netdev_tx_t vrf_process_v4_outbound(struct sk_buff *skb, |
521 | struct net_device *vrf_dev) | |
522 | { | |
107e47cc | 523 | struct iphdr *ip4h; |
193125db | 524 | int ret = NET_XMIT_DROP; |
107e47cc | 525 | struct flowi4 fl4; |
911a66fb DA |
526 | struct net *net = dev_net(vrf_dev); |
527 | struct rtable *rt; | |
528 | ||
107e47cc PK |
529 | if (!pskb_may_pull(skb, ETH_HLEN + sizeof(struct iphdr))) |
530 | goto err; | |
531 | ||
532 | ip4h = ip_hdr(skb); | |
533 | ||
534 | memset(&fl4, 0, sizeof(fl4)); | |
535 | /* needed to match OIF rule */ | |
536 | fl4.flowi4_oif = vrf_dev->ifindex; | |
537 | fl4.flowi4_iif = LOOPBACK_IFINDEX; | |
538 | fl4.flowi4_tos = RT_TOS(ip4h->tos); | |
539 | fl4.flowi4_flags = FLOWI_FLAG_ANYSRC | FLOWI_FLAG_SKIP_NH_OIF; | |
540 | fl4.flowi4_proto = ip4h->protocol; | |
541 | fl4.daddr = ip4h->daddr; | |
542 | fl4.saddr = ip4h->saddr; | |
543 | ||
911a66fb DA |
544 | rt = ip_route_output_flow(net, &fl4, NULL); |
545 | if (IS_ERR(rt)) | |
546 | goto err; | |
193125db | 547 | |
911a66fb | 548 | skb_dst_drop(skb); |
afe80a49 DA |
549 | |
550 | /* if dst.dev is loopback or the VRF device again this is locally | |
551 | * originated traffic destined to a local address. Short circuit | |
4f04256c | 552 | * to Rx path |
afe80a49 | 553 | */ |
4f04256c DA |
554 | if (rt->dst.dev == vrf_dev) |
555 | return vrf_local_xmit(skb, vrf_dev, &rt->dst); | |
afe80a49 | 556 | |
911a66fb DA |
557 | skb_dst_set(skb, &rt->dst); |
558 | ||
559 | /* strip the ethernet header added for pass through VRF device */ | |
560 | __skb_pull(skb, skb_network_offset(skb)); | |
193125db DA |
561 | |
562 | if (!ip4h->saddr) { | |
563 | ip4h->saddr = inet_select_addr(skb_dst(skb)->dev, 0, | |
564 | RT_SCOPE_LINK); | |
565 | } | |
566 | ||
ebfc102c | 567 | ret = vrf_ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb); |
193125db DA |
568 | if (unlikely(net_xmit_eval(ret))) |
569 | vrf_dev->stats.tx_errors++; | |
570 | else | |
571 | ret = NET_XMIT_SUCCESS; | |
572 | ||
573 | out: | |
574 | return ret; | |
575 | err: | |
57b8efa1 | 576 | vrf_tx_error(vrf_dev, skb); |
193125db DA |
577 | goto out; |
578 | } | |
579 | ||
580 | static netdev_tx_t is_ip_tx_frame(struct sk_buff *skb, struct net_device *dev) | |
581 | { | |
582 | switch (skb->protocol) { | |
583 | case htons(ETH_P_IP): | |
584 | return vrf_process_v4_outbound(skb, dev); | |
585 | case htons(ETH_P_IPV6): | |
586 | return vrf_process_v6_outbound(skb, dev); | |
587 | default: | |
57b8efa1 | 588 | vrf_tx_error(dev, skb); |
193125db DA |
589 | return NET_XMIT_DROP; |
590 | } | |
591 | } | |
592 | ||
593 | static netdev_tx_t vrf_xmit(struct sk_buff *skb, struct net_device *dev) | |
594 | { | |
f7887d40 | 595 | int len = skb->len; |
193125db DA |
596 | netdev_tx_t ret = is_ip_tx_frame(skb, dev); |
597 | ||
598 | if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { | |
599 | struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats); | |
600 | ||
601 | u64_stats_update_begin(&dstats->syncp); | |
602 | dstats->tx_pkts++; | |
f7887d40 | 603 | dstats->tx_bytes += len; |
193125db DA |
604 | u64_stats_update_end(&dstats->syncp); |
605 | } else { | |
606 | this_cpu_inc(dev->dstats->tx_drps); | |
607 | } | |
608 | ||
609 | return ret; | |
610 | } | |
611 | ||
9e2b7fa2 | 612 | static void vrf_finish_direct(struct sk_buff *skb) |
dcdd43c4 DA |
613 | { |
614 | struct net_device *vrf_dev = skb->dev; | |
615 | ||
616 | if (!list_empty(&vrf_dev->ptype_all) && | |
617 | likely(skb_headroom(skb) >= ETH_HLEN)) { | |
d58ff351 | 618 | struct ethhdr *eth = skb_push(skb, ETH_HLEN); |
dcdd43c4 DA |
619 | |
620 | ether_addr_copy(eth->h_source, vrf_dev->dev_addr); | |
621 | eth_zero_addr(eth->h_dest); | |
622 | eth->h_proto = skb->protocol; | |
623 | ||
624 | rcu_read_lock_bh(); | |
625 | dev_queue_xmit_nit(skb, vrf_dev); | |
626 | rcu_read_unlock_bh(); | |
627 | ||
628 | skb_pull(skb, ETH_HLEN); | |
629 | } | |
630 | ||
9e2b7fa2 MW |
631 | /* reset skb device */ |
632 | nf_reset_ct(skb); | |
dcdd43c4 DA |
633 | } |
634 | ||
35402e31 | 635 | #if IS_ENABLED(CONFIG_IPV6) |
35402e31 DA |
636 | /* modelled after ip6_finish_output2 */ |
637 | static int vrf_finish_output6(struct net *net, struct sock *sk, | |
638 | struct sk_buff *skb) | |
639 | { | |
640 | struct dst_entry *dst = skb_dst(skb); | |
641 | struct net_device *dev = dst->dev; | |
9b1c1ef1 | 642 | const struct in6_addr *nexthop; |
35402e31 | 643 | struct neighbour *neigh; |
35402e31 DA |
644 | int ret; |
645 | ||
895b5c9f | 646 | nf_reset_ct(skb); |
eb63ecc1 | 647 | |
35402e31 DA |
648 | skb->protocol = htons(ETH_P_IPV6); |
649 | skb->dev = dev; | |
650 | ||
651 | rcu_read_lock_bh(); | |
652 | nexthop = rt6_nexthop((struct rt6_info *)dst, &ipv6_hdr(skb)->daddr); | |
653 | neigh = __ipv6_neigh_lookup_noref(dst->dev, nexthop); | |
654 | if (unlikely(!neigh)) | |
655 | neigh = __neigh_create(&nd_tbl, nexthop, dst->dev, false); | |
656 | if (!IS_ERR(neigh)) { | |
4ff06203 | 657 | sock_confirm_neigh(skb, neigh); |
0353f282 | 658 | ret = neigh_output(neigh, skb, false); |
35402e31 DA |
659 | rcu_read_unlock_bh(); |
660 | return ret; | |
661 | } | |
662 | rcu_read_unlock_bh(); | |
663 | ||
664 | IP6_INC_STATS(dev_net(dst->dev), | |
665 | ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES); | |
666 | kfree_skb(skb); | |
667 | return -EINVAL; | |
668 | } | |
669 | ||
670 | /* modelled after ip6_output */ | |
671 | static int vrf_output6(struct net *net, struct sock *sk, struct sk_buff *skb) | |
672 | { | |
673 | return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING, | |
674 | net, sk, skb, NULL, skb_dst(skb)->dev, | |
675 | vrf_finish_output6, | |
676 | !(IP6CB(skb)->flags & IP6SKB_REROUTED)); | |
677 | } | |
678 | ||
4c1feac5 DA |
679 | /* set dst on skb to send packet to us via dev_xmit path. Allows |
680 | * packet to go through device based features such as qdisc, netfilter | |
681 | * hooks and packet sockets with skb->dev set to vrf device. | |
682 | */ | |
a9ec54d1 DA |
683 | static struct sk_buff *vrf_ip6_out_redirect(struct net_device *vrf_dev, |
684 | struct sk_buff *skb) | |
4c1feac5 DA |
685 | { |
686 | struct net_vrf *vrf = netdev_priv(vrf_dev); | |
687 | struct dst_entry *dst = NULL; | |
688 | struct rt6_info *rt6; | |
689 | ||
4c1feac5 DA |
690 | rcu_read_lock(); |
691 | ||
692 | rt6 = rcu_dereference(vrf->rt6); | |
693 | if (likely(rt6)) { | |
694 | dst = &rt6->dst; | |
695 | dst_hold(dst); | |
696 | } | |
697 | ||
698 | rcu_read_unlock(); | |
699 | ||
700 | if (unlikely(!dst)) { | |
701 | vrf_tx_error(vrf_dev, skb); | |
702 | return NULL; | |
703 | } | |
704 | ||
705 | skb_dst_drop(skb); | |
706 | skb_dst_set(skb, dst); | |
707 | ||
708 | return skb; | |
709 | } | |
710 | ||
9e2b7fa2 MW |
711 | static int vrf_output6_direct_finish(struct net *net, struct sock *sk, |
712 | struct sk_buff *skb) | |
713 | { | |
714 | vrf_finish_direct(skb); | |
715 | ||
716 | return vrf_ip6_local_out(net, sk, skb); | |
717 | } | |
718 | ||
a9ec54d1 DA |
719 | static int vrf_output6_direct(struct net *net, struct sock *sk, |
720 | struct sk_buff *skb) | |
721 | { | |
9e2b7fa2 MW |
722 | int err = 1; |
723 | ||
a9ec54d1 DA |
724 | skb->protocol = htons(ETH_P_IPV6); |
725 | ||
9e2b7fa2 MW |
726 | if (!(IPCB(skb)->flags & IPSKB_REROUTED)) |
727 | err = nf_hook(NFPROTO_IPV6, NF_INET_POST_ROUTING, net, sk, skb, | |
728 | NULL, skb->dev, vrf_output6_direct_finish); | |
729 | ||
730 | if (likely(err == 1)) | |
731 | vrf_finish_direct(skb); | |
732 | ||
733 | return err; | |
734 | } | |
735 | ||
736 | static int vrf_ip6_out_direct_finish(struct net *net, struct sock *sk, | |
737 | struct sk_buff *skb) | |
738 | { | |
739 | int err; | |
740 | ||
741 | err = vrf_output6_direct(net, sk, skb); | |
742 | if (likely(err == 1)) | |
743 | err = vrf_ip6_local_out(net, sk, skb); | |
744 | ||
745 | return err; | |
a9ec54d1 DA |
746 | } |
747 | ||
748 | static struct sk_buff *vrf_ip6_out_direct(struct net_device *vrf_dev, | |
749 | struct sock *sk, | |
750 | struct sk_buff *skb) | |
751 | { | |
752 | struct net *net = dev_net(vrf_dev); | |
753 | int err; | |
754 | ||
755 | skb->dev = vrf_dev; | |
756 | ||
757 | err = nf_hook(NFPROTO_IPV6, NF_INET_LOCAL_OUT, net, sk, | |
9e2b7fa2 | 758 | skb, NULL, vrf_dev, vrf_ip6_out_direct_finish); |
a9ec54d1 DA |
759 | |
760 | if (likely(err == 1)) | |
761 | err = vrf_output6_direct(net, sk, skb); | |
762 | ||
a9ec54d1 | 763 | if (likely(err == 1)) |
9e2b7fa2 | 764 | return skb; |
a9ec54d1 | 765 | |
9e2b7fa2 | 766 | return NULL; |
a9ec54d1 DA |
767 | } |
768 | ||
769 | static struct sk_buff *vrf_ip6_out(struct net_device *vrf_dev, | |
770 | struct sock *sk, | |
771 | struct sk_buff *skb) | |
772 | { | |
773 | /* don't divert link scope packets */ | |
774 | if (rt6_need_strict(&ipv6_hdr(skb)->daddr)) | |
775 | return skb; | |
776 | ||
16b9db1c DA |
777 | if (qdisc_tx_is_default(vrf_dev) || |
778 | IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED) | |
a9ec54d1 DA |
779 | return vrf_ip6_out_direct(vrf_dev, sk, skb); |
780 | ||
781 | return vrf_ip6_out_redirect(vrf_dev, skb); | |
782 | } | |
783 | ||
b0e95ccd | 784 | /* holding rtnl */ |
810e530b | 785 | static void vrf_rt6_release(struct net_device *dev, struct net_vrf *vrf) |
35402e31 | 786 | { |
b0e95ccd | 787 | struct rt6_info *rt6 = rtnl_dereference(vrf->rt6); |
810e530b DA |
788 | struct net *net = dev_net(dev); |
789 | struct dst_entry *dst; | |
b0e95ccd | 790 | |
b4869aa2 | 791 | RCU_INIT_POINTER(vrf->rt6, NULL); |
b4869aa2 | 792 | synchronize_rcu(); |
b0e95ccd | 793 | |
810e530b DA |
794 | /* move dev in dst's to loopback so this VRF device can be deleted |
795 | * - based on dst_ifdown | |
796 | */ | |
797 | if (rt6) { | |
798 | dst = &rt6->dst; | |
799 | dev_put(dst->dev); | |
800 | dst->dev = net->loopback_dev; | |
801 | dev_hold(dst->dev); | |
802 | dst_release(dst); | |
803 | } | |
35402e31 DA |
804 | } |
805 | ||
806 | static int vrf_rt6_create(struct net_device *dev) | |
807 | { | |
af13b3c3 | 808 | int flags = DST_NOPOLICY | DST_NOXFRM; |
35402e31 | 809 | struct net_vrf *vrf = netdev_priv(dev); |
9ab179d8 | 810 | struct net *net = dev_net(dev); |
4f04256c | 811 | struct rt6_info *rt6; |
35402e31 DA |
812 | int rc = -ENOMEM; |
813 | ||
e4348637 DA |
814 | /* IPv6 can be CONFIG enabled and then disabled runtime */ |
815 | if (!ipv6_mod_enabled()) | |
816 | return 0; | |
817 | ||
43b059a3 DA |
818 | vrf->fib6_table = fib6_new_table(net, vrf->tb_id); |
819 | if (!vrf->fib6_table) | |
b3b4663c DA |
820 | goto out; |
821 | ||
b4869aa2 DA |
822 | /* create a dst for routing packets out a VRF device */ |
823 | rt6 = ip6_dst_alloc(net, dev, flags); | |
35402e31 DA |
824 | if (!rt6) |
825 | goto out; | |
826 | ||
b3b4663c | 827 | rt6->dst.output = vrf_output6; |
b4869aa2 | 828 | |
b0e95ccd DA |
829 | rcu_assign_pointer(vrf->rt6, rt6); |
830 | ||
35402e31 DA |
831 | rc = 0; |
832 | out: | |
833 | return rc; | |
834 | } | |
835 | #else | |
4c1feac5 DA |
836 | static struct sk_buff *vrf_ip6_out(struct net_device *vrf_dev, |
837 | struct sock *sk, | |
838 | struct sk_buff *skb) | |
839 | { | |
840 | return skb; | |
841 | } | |
842 | ||
810e530b | 843 | static void vrf_rt6_release(struct net_device *dev, struct net_vrf *vrf) |
35402e31 DA |
844 | { |
845 | } | |
846 | ||
847 | static int vrf_rt6_create(struct net_device *dev) | |
848 | { | |
849 | return 0; | |
850 | } | |
851 | #endif | |
852 | ||
8f58336d | 853 | /* modelled after ip_finish_output2 */ |
0c4b51f0 | 854 | static int vrf_finish_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
193125db | 855 | { |
8f58336d DA |
856 | struct dst_entry *dst = skb_dst(skb); |
857 | struct rtable *rt = (struct rtable *)dst; | |
858 | struct net_device *dev = dst->dev; | |
859 | unsigned int hh_len = LL_RESERVED_SPACE(dev); | |
860 | struct neighbour *neigh; | |
5c9f7c1d | 861 | bool is_v6gw = false; |
8f58336d DA |
862 | int ret = -EINVAL; |
863 | ||
895b5c9f | 864 | nf_reset_ct(skb); |
eb63ecc1 | 865 | |
8f58336d DA |
866 | /* Be paranoid, rather than too clever. */ |
867 | if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) { | |
868 | struct sk_buff *skb2; | |
869 | ||
870 | skb2 = skb_realloc_headroom(skb, LL_RESERVED_SPACE(dev)); | |
871 | if (!skb2) { | |
872 | ret = -ENOMEM; | |
873 | goto err; | |
874 | } | |
875 | if (skb->sk) | |
876 | skb_set_owner_w(skb2, skb->sk); | |
877 | ||
878 | consume_skb(skb); | |
879 | skb = skb2; | |
880 | } | |
881 | ||
882 | rcu_read_lock_bh(); | |
883 | ||
5c9f7c1d | 884 | neigh = ip_neigh_for_gw(rt, skb, &is_v6gw); |
4ff06203 JA |
885 | if (!IS_ERR(neigh)) { |
886 | sock_confirm_neigh(skb, neigh); | |
5c9f7c1d DA |
887 | /* if crossing protocols, can not use the cached header */ |
888 | ret = neigh_output(neigh, skb, is_v6gw); | |
82dd0d2a DA |
889 | rcu_read_unlock_bh(); |
890 | return ret; | |
4ff06203 | 891 | } |
8f58336d DA |
892 | |
893 | rcu_read_unlock_bh(); | |
894 | err: | |
82dd0d2a | 895 | vrf_tx_error(skb->dev, skb); |
8f58336d | 896 | return ret; |
193125db DA |
897 | } |
898 | ||
ede2059d | 899 | static int vrf_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
193125db DA |
900 | { |
901 | struct net_device *dev = skb_dst(skb)->dev; | |
902 | ||
29a26a56 | 903 | IP_UPD_PO_STATS(net, IPSTATS_MIB_OUT, skb->len); |
193125db DA |
904 | |
905 | skb->dev = dev; | |
906 | skb->protocol = htons(ETH_P_IP); | |
907 | ||
29a26a56 EB |
908 | return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING, |
909 | net, sk, skb, NULL, dev, | |
8f58336d | 910 | vrf_finish_output, |
193125db DA |
911 | !(IPCB(skb)->flags & IPSKB_REROUTED)); |
912 | } | |
913 | ||
ebfc102c DA |
914 | /* set dst on skb to send packet to us via dev_xmit path. Allows |
915 | * packet to go through device based features such as qdisc, netfilter | |
916 | * hooks and packet sockets with skb->dev set to vrf device. | |
917 | */ | |
dcdd43c4 DA |
918 | static struct sk_buff *vrf_ip_out_redirect(struct net_device *vrf_dev, |
919 | struct sk_buff *skb) | |
ebfc102c DA |
920 | { |
921 | struct net_vrf *vrf = netdev_priv(vrf_dev); | |
922 | struct dst_entry *dst = NULL; | |
923 | struct rtable *rth; | |
924 | ||
925 | rcu_read_lock(); | |
926 | ||
927 | rth = rcu_dereference(vrf->rth); | |
928 | if (likely(rth)) { | |
929 | dst = &rth->dst; | |
930 | dst_hold(dst); | |
931 | } | |
932 | ||
933 | rcu_read_unlock(); | |
934 | ||
935 | if (unlikely(!dst)) { | |
936 | vrf_tx_error(vrf_dev, skb); | |
937 | return NULL; | |
938 | } | |
939 | ||
940 | skb_dst_drop(skb); | |
941 | skb_dst_set(skb, dst); | |
942 | ||
943 | return skb; | |
944 | } | |
945 | ||
9e2b7fa2 MW |
946 | static int vrf_output_direct_finish(struct net *net, struct sock *sk, |
947 | struct sk_buff *skb) | |
948 | { | |
949 | vrf_finish_direct(skb); | |
950 | ||
951 | return vrf_ip_local_out(net, sk, skb); | |
952 | } | |
953 | ||
dcdd43c4 DA |
954 | static int vrf_output_direct(struct net *net, struct sock *sk, |
955 | struct sk_buff *skb) | |
956 | { | |
9e2b7fa2 MW |
957 | int err = 1; |
958 | ||
dcdd43c4 DA |
959 | skb->protocol = htons(ETH_P_IP); |
960 | ||
9e2b7fa2 MW |
961 | if (!(IPCB(skb)->flags & IPSKB_REROUTED)) |
962 | err = nf_hook(NFPROTO_IPV4, NF_INET_POST_ROUTING, net, sk, skb, | |
963 | NULL, skb->dev, vrf_output_direct_finish); | |
964 | ||
965 | if (likely(err == 1)) | |
966 | vrf_finish_direct(skb); | |
967 | ||
968 | return err; | |
969 | } | |
970 | ||
971 | static int vrf_ip_out_direct_finish(struct net *net, struct sock *sk, | |
972 | struct sk_buff *skb) | |
973 | { | |
974 | int err; | |
975 | ||
976 | err = vrf_output_direct(net, sk, skb); | |
977 | if (likely(err == 1)) | |
978 | err = vrf_ip_local_out(net, sk, skb); | |
979 | ||
980 | return err; | |
dcdd43c4 DA |
981 | } |
982 | ||
983 | static struct sk_buff *vrf_ip_out_direct(struct net_device *vrf_dev, | |
984 | struct sock *sk, | |
985 | struct sk_buff *skb) | |
986 | { | |
987 | struct net *net = dev_net(vrf_dev); | |
988 | int err; | |
989 | ||
990 | skb->dev = vrf_dev; | |
991 | ||
992 | err = nf_hook(NFPROTO_IPV4, NF_INET_LOCAL_OUT, net, sk, | |
9e2b7fa2 | 993 | skb, NULL, vrf_dev, vrf_ip_out_direct_finish); |
dcdd43c4 DA |
994 | |
995 | if (likely(err == 1)) | |
996 | err = vrf_output_direct(net, sk, skb); | |
997 | ||
dcdd43c4 | 998 | if (likely(err == 1)) |
9e2b7fa2 | 999 | return skb; |
dcdd43c4 | 1000 | |
9e2b7fa2 | 1001 | return NULL; |
dcdd43c4 DA |
1002 | } |
1003 | ||
1004 | static struct sk_buff *vrf_ip_out(struct net_device *vrf_dev, | |
1005 | struct sock *sk, | |
1006 | struct sk_buff *skb) | |
1007 | { | |
1e19c4d6 DA |
1008 | /* don't divert multicast or local broadcast */ |
1009 | if (ipv4_is_multicast(ip_hdr(skb)->daddr) || | |
1010 | ipv4_is_lbcast(ip_hdr(skb)->daddr)) | |
dcdd43c4 DA |
1011 | return skb; |
1012 | ||
16b9db1c DA |
1013 | if (qdisc_tx_is_default(vrf_dev) || |
1014 | IPCB(skb)->flags & IPSKB_XFRM_TRANSFORMED) | |
dcdd43c4 DA |
1015 | return vrf_ip_out_direct(vrf_dev, sk, skb); |
1016 | ||
1017 | return vrf_ip_out_redirect(vrf_dev, skb); | |
1018 | } | |
1019 | ||
ebfc102c DA |
1020 | /* called with rcu lock held */ |
1021 | static struct sk_buff *vrf_l3_out(struct net_device *vrf_dev, | |
1022 | struct sock *sk, | |
1023 | struct sk_buff *skb, | |
1024 | u16 proto) | |
1025 | { | |
1026 | switch (proto) { | |
1027 | case AF_INET: | |
1028 | return vrf_ip_out(vrf_dev, sk, skb); | |
4c1feac5 DA |
1029 | case AF_INET6: |
1030 | return vrf_ip6_out(vrf_dev, sk, skb); | |
ebfc102c DA |
1031 | } |
1032 | ||
1033 | return skb; | |
1034 | } | |
1035 | ||
b0e95ccd | 1036 | /* holding rtnl */ |
810e530b | 1037 | static void vrf_rtable_release(struct net_device *dev, struct net_vrf *vrf) |
193125db | 1038 | { |
b0e95ccd | 1039 | struct rtable *rth = rtnl_dereference(vrf->rth); |
810e530b DA |
1040 | struct net *net = dev_net(dev); |
1041 | struct dst_entry *dst; | |
b0e95ccd | 1042 | |
afe80a49 | 1043 | RCU_INIT_POINTER(vrf->rth, NULL); |
afe80a49 | 1044 | synchronize_rcu(); |
193125db | 1045 | |
810e530b DA |
1046 | /* move dev in dst's to loopback so this VRF device can be deleted |
1047 | * - based on dst_ifdown | |
1048 | */ | |
1049 | if (rth) { | |
1050 | dst = &rth->dst; | |
1051 | dev_put(dst->dev); | |
1052 | dst->dev = net->loopback_dev; | |
1053 | dev_hold(dst->dev); | |
1054 | dst_release(dst); | |
1055 | } | |
193125db DA |
1056 | } |
1057 | ||
b0e95ccd | 1058 | static int vrf_rtable_create(struct net_device *dev) |
193125db | 1059 | { |
b7503e0c | 1060 | struct net_vrf *vrf = netdev_priv(dev); |
4f04256c | 1061 | struct rtable *rth; |
193125db | 1062 | |
b3b4663c | 1063 | if (!fib_new_table(dev_net(dev), vrf->tb_id)) |
b0e95ccd | 1064 | return -ENOMEM; |
b3b4663c | 1065 | |
afe80a49 | 1066 | /* create a dst for routing packets out through a VRF device */ |
af13b3c3 | 1067 | rth = rt_dst_alloc(dev, 0, RTN_UNICAST, 1, 1); |
b0e95ccd DA |
1068 | if (!rth) |
1069 | return -ENOMEM; | |
193125db | 1070 | |
b0e95ccd | 1071 | rth->dst.output = vrf_output; |
b0e95ccd DA |
1072 | |
1073 | rcu_assign_pointer(vrf->rth, rth); | |
1074 | ||
1075 | return 0; | |
193125db DA |
1076 | } |
1077 | ||
1078 | /**************************** device handling ********************/ | |
1079 | ||
1080 | /* cycle interface to flush neighbor cache and move routes across tables */ | |
dc1aea1e PM |
1081 | static void cycle_netdev(struct net_device *dev, |
1082 | struct netlink_ext_ack *extack) | |
193125db DA |
1083 | { |
1084 | unsigned int flags = dev->flags; | |
1085 | int ret; | |
1086 | ||
1087 | if (!netif_running(dev)) | |
1088 | return; | |
1089 | ||
567c5e13 | 1090 | ret = dev_change_flags(dev, flags & ~IFF_UP, extack); |
193125db | 1091 | if (ret >= 0) |
567c5e13 | 1092 | ret = dev_change_flags(dev, flags, extack); |
193125db DA |
1093 | |
1094 | if (ret < 0) { | |
1095 | netdev_err(dev, | |
1096 | "Failed to cycle device %s; route tables might be wrong!\n", | |
1097 | dev->name); | |
1098 | } | |
1099 | } | |
1100 | ||
42ab19ee DA |
1101 | static int do_vrf_add_slave(struct net_device *dev, struct net_device *port_dev, |
1102 | struct netlink_ext_ack *extack) | |
193125db | 1103 | { |
bad53162 | 1104 | int ret; |
193125db | 1105 | |
26d31ac1 DA |
1106 | /* do not allow loopback device to be enslaved to a VRF. |
1107 | * The vrf device acts as the loopback for the vrf. | |
1108 | */ | |
de3baa3e DA |
1109 | if (port_dev == dev_net(dev)->loopback_dev) { |
1110 | NL_SET_ERR_MSG(extack, | |
1111 | "Can not enslave loopback device to a VRF"); | |
26d31ac1 | 1112 | return -EOPNOTSUPP; |
de3baa3e | 1113 | } |
26d31ac1 | 1114 | |
fdeea7be | 1115 | port_dev->priv_flags |= IFF_L3MDEV_SLAVE; |
42ab19ee | 1116 | ret = netdev_master_upper_dev_link(port_dev, dev, NULL, NULL, extack); |
193125db | 1117 | if (ret < 0) |
fdeea7be | 1118 | goto err; |
193125db | 1119 | |
dc1aea1e | 1120 | cycle_netdev(port_dev, extack); |
193125db DA |
1121 | |
1122 | return 0; | |
fdeea7be IS |
1123 | |
1124 | err: | |
1125 | port_dev->priv_flags &= ~IFF_L3MDEV_SLAVE; | |
1126 | return ret; | |
193125db DA |
1127 | } |
1128 | ||
33eaf2a6 DA |
1129 | static int vrf_add_slave(struct net_device *dev, struct net_device *port_dev, |
1130 | struct netlink_ext_ack *extack) | |
193125db | 1131 | { |
de3baa3e DA |
1132 | if (netif_is_l3_master(port_dev)) { |
1133 | NL_SET_ERR_MSG(extack, | |
1134 | "Can not enslave an L3 master device to a VRF"); | |
1135 | return -EINVAL; | |
1136 | } | |
1137 | ||
1138 | if (netif_is_l3_slave(port_dev)) | |
193125db DA |
1139 | return -EINVAL; |
1140 | ||
42ab19ee | 1141 | return do_vrf_add_slave(dev, port_dev, extack); |
193125db DA |
1142 | } |
1143 | ||
1144 | /* inverse of do_vrf_add_slave */ | |
1145 | static int do_vrf_del_slave(struct net_device *dev, struct net_device *port_dev) | |
1146 | { | |
193125db | 1147 | netdev_upper_dev_unlink(port_dev, dev); |
fee6d4c7 | 1148 | port_dev->priv_flags &= ~IFF_L3MDEV_SLAVE; |
193125db | 1149 | |
dc1aea1e | 1150 | cycle_netdev(port_dev, NULL); |
193125db | 1151 | |
193125db DA |
1152 | return 0; |
1153 | } | |
1154 | ||
1155 | static int vrf_del_slave(struct net_device *dev, struct net_device *port_dev) | |
1156 | { | |
193125db DA |
1157 | return do_vrf_del_slave(dev, port_dev); |
1158 | } | |
1159 | ||
1160 | static void vrf_dev_uninit(struct net_device *dev) | |
1161 | { | |
1162 | struct net_vrf *vrf = netdev_priv(dev); | |
193125db | 1163 | |
810e530b DA |
1164 | vrf_rtable_release(dev, vrf); |
1165 | vrf_rt6_release(dev, vrf); | |
193125db | 1166 | |
3a4a27d3 | 1167 | free_percpu(dev->dstats); |
193125db DA |
1168 | dev->dstats = NULL; |
1169 | } | |
1170 | ||
1171 | static int vrf_dev_init(struct net_device *dev) | |
1172 | { | |
1173 | struct net_vrf *vrf = netdev_priv(dev); | |
1174 | ||
193125db DA |
1175 | dev->dstats = netdev_alloc_pcpu_stats(struct pcpu_dstats); |
1176 | if (!dev->dstats) | |
1177 | goto out_nomem; | |
1178 | ||
1179 | /* create the default dst which points back to us */ | |
b0e95ccd | 1180 | if (vrf_rtable_create(dev) != 0) |
193125db DA |
1181 | goto out_stats; |
1182 | ||
35402e31 DA |
1183 | if (vrf_rt6_create(dev) != 0) |
1184 | goto out_rth; | |
1185 | ||
193125db DA |
1186 | dev->flags = IFF_MASTER | IFF_NOARP; |
1187 | ||
b87ab6b8 DA |
1188 | /* MTU is irrelevant for VRF device; set to 64k similar to lo */ |
1189 | dev->mtu = 64 * 1024; | |
1190 | ||
1191 | /* similarly, oper state is irrelevant; set to up to avoid confusion */ | |
1192 | dev->operstate = IF_OPER_UP; | |
1a33e10e | 1193 | netdev_lockdep_set_classes(dev); |
193125db DA |
1194 | return 0; |
1195 | ||
35402e31 | 1196 | out_rth: |
810e530b | 1197 | vrf_rtable_release(dev, vrf); |
193125db DA |
1198 | out_stats: |
1199 | free_percpu(dev->dstats); | |
1200 | dev->dstats = NULL; | |
1201 | out_nomem: | |
1202 | return -ENOMEM; | |
1203 | } | |
1204 | ||
1205 | static const struct net_device_ops vrf_netdev_ops = { | |
1206 | .ndo_init = vrf_dev_init, | |
1207 | .ndo_uninit = vrf_dev_uninit, | |
1208 | .ndo_start_xmit = vrf_xmit, | |
6819e3f6 | 1209 | .ndo_set_mac_address = eth_mac_addr, |
193125db DA |
1210 | .ndo_get_stats64 = vrf_get_stats64, |
1211 | .ndo_add_slave = vrf_add_slave, | |
1212 | .ndo_del_slave = vrf_del_slave, | |
1213 | }; | |
1214 | ||
ee15ee5d DA |
1215 | static u32 vrf_fib_table(const struct net_device *dev) |
1216 | { | |
1217 | struct net_vrf *vrf = netdev_priv(dev); | |
1218 | ||
1219 | return vrf->tb_id; | |
1220 | } | |
1221 | ||
73e20b76 DA |
1222 | static int vrf_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb) |
1223 | { | |
1a4a5bf5 | 1224 | kfree_skb(skb); |
73e20b76 DA |
1225 | return 0; |
1226 | } | |
1227 | ||
1228 | static struct sk_buff *vrf_rcv_nfhook(u8 pf, unsigned int hook, | |
1229 | struct sk_buff *skb, | |
1230 | struct net_device *dev) | |
1231 | { | |
1232 | struct net *net = dev_net(dev); | |
1233 | ||
1a4a5bf5 | 1234 | if (nf_hook(pf, hook, net, NULL, skb, dev, NULL, vrf_rcv_finish) != 1) |
73e20b76 DA |
1235 | skb = NULL; /* kfree_skb(skb) handled by nf code */ |
1236 | ||
1237 | return skb; | |
1238 | } | |
1239 | ||
9125abe7 AM |
1240 | static int vrf_prepare_mac_header(struct sk_buff *skb, |
1241 | struct net_device *vrf_dev, u16 proto) | |
1242 | { | |
1243 | struct ethhdr *eth; | |
1244 | int err; | |
1245 | ||
1246 | /* in general, we do not know if there is enough space in the head of | |
1247 | * the packet for hosting the mac header. | |
1248 | */ | |
1249 | err = skb_cow_head(skb, LL_RESERVED_SPACE(vrf_dev)); | |
1250 | if (unlikely(err)) | |
1251 | /* no space in the skb head */ | |
1252 | return -ENOBUFS; | |
1253 | ||
1254 | __skb_push(skb, ETH_HLEN); | |
1255 | eth = (struct ethhdr *)skb->data; | |
1256 | ||
1257 | skb_reset_mac_header(skb); | |
1258 | ||
1259 | /* we set the ethernet destination and the source addresses to the | |
1260 | * address of the VRF device. | |
1261 | */ | |
1262 | ether_addr_copy(eth->h_dest, vrf_dev->dev_addr); | |
1263 | ether_addr_copy(eth->h_source, vrf_dev->dev_addr); | |
1264 | eth->h_proto = htons(proto); | |
1265 | ||
1266 | /* the destination address of the Ethernet frame corresponds to the | |
1267 | * address set on the VRF interface; therefore, the packet is intended | |
1268 | * to be processed locally. | |
1269 | */ | |
1270 | skb->protocol = eth->h_proto; | |
1271 | skb->pkt_type = PACKET_HOST; | |
1272 | ||
1273 | skb_postpush_rcsum(skb, skb->data, ETH_HLEN); | |
1274 | ||
1275 | skb_pull_inline(skb, ETH_HLEN); | |
1276 | ||
1277 | return 0; | |
1278 | } | |
1279 | ||
1280 | /* prepare and add the mac header to the packet if it was not set previously. | |
1281 | * In this way, packet sniffers such as tcpdump can parse the packet correctly. | |
1282 | * If the mac header was already set, the original mac header is left | |
1283 | * untouched and the function returns immediately. | |
1284 | */ | |
1285 | static int vrf_add_mac_header_if_unset(struct sk_buff *skb, | |
1286 | struct net_device *vrf_dev, | |
1287 | u16 proto) | |
1288 | { | |
1289 | if (skb_mac_header_was_set(skb)) | |
1290 | return 0; | |
1291 | ||
1292 | return vrf_prepare_mac_header(skb, vrf_dev, proto); | |
1293 | } | |
1294 | ||
74b20582 DA |
1295 | #if IS_ENABLED(CONFIG_IPV6) |
1296 | /* neighbor handling is done with actual device; do not want | |
1297 | * to flip skb->dev for those ndisc packets. This really fails | |
1298 | * for multiple next protocols (e.g., NEXTHDR_HOP). But it is | |
1299 | * a start. | |
1300 | */ | |
1301 | static bool ipv6_ndisc_frame(const struct sk_buff *skb) | |
1302 | { | |
1303 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
1304 | bool rc = false; | |
1305 | ||
1306 | if (iph->nexthdr == NEXTHDR_ICMP) { | |
1307 | const struct icmp6hdr *icmph; | |
1308 | struct icmp6hdr _icmph; | |
1309 | ||
1310 | icmph = skb_header_pointer(skb, sizeof(*iph), | |
1311 | sizeof(_icmph), &_icmph); | |
1312 | if (!icmph) | |
1313 | goto out; | |
1314 | ||
1315 | switch (icmph->icmp6_type) { | |
1316 | case NDISC_ROUTER_SOLICITATION: | |
1317 | case NDISC_ROUTER_ADVERTISEMENT: | |
1318 | case NDISC_NEIGHBOUR_SOLICITATION: | |
1319 | case NDISC_NEIGHBOUR_ADVERTISEMENT: | |
1320 | case NDISC_REDIRECT: | |
1321 | rc = true; | |
1322 | break; | |
1323 | } | |
1324 | } | |
1325 | ||
1326 | out: | |
1327 | return rc; | |
1328 | } | |
1329 | ||
9ff74384 DA |
1330 | static struct rt6_info *vrf_ip6_route_lookup(struct net *net, |
1331 | const struct net_device *dev, | |
1332 | struct flowi6 *fl6, | |
1333 | int ifindex, | |
b75cc8f9 | 1334 | const struct sk_buff *skb, |
9ff74384 DA |
1335 | int flags) |
1336 | { | |
1337 | struct net_vrf *vrf = netdev_priv(dev); | |
9ff74384 | 1338 | |
43b059a3 | 1339 | return ip6_pol_route(net, vrf->fib6_table, ifindex, fl6, skb, flags); |
9ff74384 DA |
1340 | } |
1341 | ||
1342 | static void vrf_ip6_input_dst(struct sk_buff *skb, struct net_device *vrf_dev, | |
1343 | int ifindex) | |
1344 | { | |
1345 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
1346 | struct flowi6 fl6 = { | |
ecf09117 AB |
1347 | .flowi6_iif = ifindex, |
1348 | .flowi6_mark = skb->mark, | |
1349 | .flowi6_proto = iph->nexthdr, | |
9ff74384 DA |
1350 | .daddr = iph->daddr, |
1351 | .saddr = iph->saddr, | |
1352 | .flowlabel = ip6_flowinfo(iph), | |
9ff74384 DA |
1353 | }; |
1354 | struct net *net = dev_net(vrf_dev); | |
1355 | struct rt6_info *rt6; | |
1356 | ||
b75cc8f9 | 1357 | rt6 = vrf_ip6_route_lookup(net, vrf_dev, &fl6, ifindex, skb, |
9ff74384 DA |
1358 | RT6_LOOKUP_F_HAS_SADDR | RT6_LOOKUP_F_IFACE); |
1359 | if (unlikely(!rt6)) | |
1360 | return; | |
1361 | ||
1362 | if (unlikely(&rt6->dst == &net->ipv6.ip6_null_entry->dst)) | |
1363 | return; | |
1364 | ||
1365 | skb_dst_set(skb, &rt6->dst); | |
1366 | } | |
1367 | ||
74b20582 DA |
1368 | static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev, |
1369 | struct sk_buff *skb) | |
1370 | { | |
9ff74384 | 1371 | int orig_iif = skb->skb_iif; |
6f12fa77 MM |
1372 | bool need_strict = rt6_need_strict(&ipv6_hdr(skb)->daddr); |
1373 | bool is_ndisc = ipv6_ndisc_frame(skb); | |
205704c6 | 1374 | bool is_ll_src; |
9ff74384 | 1375 | |
6f12fa77 | 1376 | /* loopback, multicast & non-ND link-local traffic; do not push through |
205704c6 SS |
1377 | * packet taps again. Reset pkt_type for upper layers to process skb. |
1378 | * for packets with lladdr src, however, skip so that the dst can be | |
1379 | * determine at input using original ifindex in the case that daddr | |
1380 | * needs strict | |
b4869aa2 | 1381 | */ |
205704c6 SS |
1382 | is_ll_src = ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL; |
1383 | if (skb->pkt_type == PACKET_LOOPBACK || | |
1384 | (need_strict && !is_ndisc && !is_ll_src)) { | |
b4869aa2 DA |
1385 | skb->dev = vrf_dev; |
1386 | skb->skb_iif = vrf_dev->ifindex; | |
a04a480d | 1387 | IP6CB(skb)->flags |= IP6SKB_L3SLAVE; |
6f12fa77 MM |
1388 | if (skb->pkt_type == PACKET_LOOPBACK) |
1389 | skb->pkt_type = PACKET_HOST; | |
b4869aa2 DA |
1390 | goto out; |
1391 | } | |
1392 | ||
6f12fa77 MM |
1393 | /* if packet is NDISC then keep the ingress interface */ |
1394 | if (!is_ndisc) { | |
926d93a3 | 1395 | vrf_rx_stats(vrf_dev, skb->len); |
74b20582 DA |
1396 | skb->dev = vrf_dev; |
1397 | skb->skb_iif = vrf_dev->ifindex; | |
1398 | ||
a9ec54d1 | 1399 | if (!list_empty(&vrf_dev->ptype_all)) { |
04893908 AM |
1400 | int err; |
1401 | ||
1402 | err = vrf_add_mac_header_if_unset(skb, vrf_dev, | |
1403 | ETH_P_IPV6); | |
1404 | if (likely(!err)) { | |
1405 | skb_push(skb, skb->mac_len); | |
1406 | dev_queue_xmit_nit(skb, vrf_dev); | |
1407 | skb_pull(skb, skb->mac_len); | |
1408 | } | |
a9ec54d1 | 1409 | } |
74b20582 DA |
1410 | |
1411 | IP6CB(skb)->flags |= IP6SKB_L3SLAVE; | |
1412 | } | |
1413 | ||
9ff74384 DA |
1414 | if (need_strict) |
1415 | vrf_ip6_input_dst(skb, vrf_dev, orig_iif); | |
1416 | ||
73e20b76 | 1417 | skb = vrf_rcv_nfhook(NFPROTO_IPV6, NF_INET_PRE_ROUTING, skb, vrf_dev); |
b4869aa2 | 1418 | out: |
74b20582 DA |
1419 | return skb; |
1420 | } | |
1421 | ||
1422 | #else | |
1423 | static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev, | |
1424 | struct sk_buff *skb) | |
1425 | { | |
1426 | return skb; | |
1427 | } | |
1428 | #endif | |
1429 | ||
1430 | static struct sk_buff *vrf_ip_rcv(struct net_device *vrf_dev, | |
1431 | struct sk_buff *skb) | |
1432 | { | |
1433 | skb->dev = vrf_dev; | |
1434 | skb->skb_iif = vrf_dev->ifindex; | |
a04a480d | 1435 | IPCB(skb)->flags |= IPSKB_L3SLAVE; |
74b20582 | 1436 | |
e58e4159 DA |
1437 | if (ipv4_is_multicast(ip_hdr(skb)->daddr)) |
1438 | goto out; | |
1439 | ||
afe80a49 DA |
1440 | /* loopback traffic; do not push through packet taps again. |
1441 | * Reset pkt_type for upper layers to process skb | |
1442 | */ | |
1443 | if (skb->pkt_type == PACKET_LOOPBACK) { | |
1444 | skb->pkt_type = PACKET_HOST; | |
1445 | goto out; | |
1446 | } | |
1447 | ||
926d93a3 DA |
1448 | vrf_rx_stats(vrf_dev, skb->len); |
1449 | ||
dcdd43c4 | 1450 | if (!list_empty(&vrf_dev->ptype_all)) { |
04893908 AM |
1451 | int err; |
1452 | ||
1453 | err = vrf_add_mac_header_if_unset(skb, vrf_dev, ETH_P_IP); | |
1454 | if (likely(!err)) { | |
1455 | skb_push(skb, skb->mac_len); | |
1456 | dev_queue_xmit_nit(skb, vrf_dev); | |
1457 | skb_pull(skb, skb->mac_len); | |
1458 | } | |
dcdd43c4 | 1459 | } |
74b20582 | 1460 | |
73e20b76 | 1461 | skb = vrf_rcv_nfhook(NFPROTO_IPV4, NF_INET_PRE_ROUTING, skb, vrf_dev); |
afe80a49 | 1462 | out: |
74b20582 DA |
1463 | return skb; |
1464 | } | |
1465 | ||
1466 | /* called with rcu lock held */ | |
1467 | static struct sk_buff *vrf_l3_rcv(struct net_device *vrf_dev, | |
1468 | struct sk_buff *skb, | |
1469 | u16 proto) | |
1470 | { | |
1471 | switch (proto) { | |
1472 | case AF_INET: | |
1473 | return vrf_ip_rcv(vrf_dev, skb); | |
1474 | case AF_INET6: | |
1475 | return vrf_ip6_rcv(vrf_dev, skb); | |
1476 | } | |
1477 | ||
1478 | return skb; | |
1479 | } | |
1480 | ||
35402e31 | 1481 | #if IS_ENABLED(CONFIG_IPV6) |
4c1feac5 DA |
1482 | /* send to link-local or multicast address via interface enslaved to |
1483 | * VRF device. Force lookup to VRF table without changing flow struct | |
7d9e5f42 WW |
1484 | * Note: Caller to this function must hold rcu_read_lock() and no refcnt |
1485 | * is taken on the dst by this function. | |
4c1feac5 DA |
1486 | */ |
1487 | static struct dst_entry *vrf_link_scope_lookup(const struct net_device *dev, | |
1488 | struct flowi6 *fl6) | |
35402e31 | 1489 | { |
9ff74384 | 1490 | struct net *net = dev_net(dev); |
7d9e5f42 | 1491 | int flags = RT6_LOOKUP_F_IFACE | RT6_LOOKUP_F_DST_NOREF; |
b0e95ccd | 1492 | struct dst_entry *dst = NULL; |
9ff74384 | 1493 | struct rt6_info *rt; |
35402e31 | 1494 | |
4c1feac5 DA |
1495 | /* VRF device does not have a link-local address and |
1496 | * sending packets to link-local or mcast addresses over | |
1497 | * a VRF device does not make sense | |
1498 | */ | |
1499 | if (fl6->flowi6_oif == dev->ifindex) { | |
1500 | dst = &net->ipv6.ip6_null_entry->dst; | |
4c1feac5 | 1501 | return dst; |
35402e31 DA |
1502 | } |
1503 | ||
4c1feac5 DA |
1504 | if (!ipv6_addr_any(&fl6->saddr)) |
1505 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
1506 | ||
b75cc8f9 | 1507 | rt = vrf_ip6_route_lookup(net, dev, fl6, fl6->flowi6_oif, NULL, flags); |
4c1feac5 DA |
1508 | if (rt) |
1509 | dst = &rt->dst; | |
9ff74384 | 1510 | |
b0e95ccd | 1511 | return dst; |
35402e31 DA |
1512 | } |
1513 | #endif | |
1514 | ||
ee15ee5d DA |
1515 | static const struct l3mdev_ops vrf_l3mdev_ops = { |
1516 | .l3mdev_fib_table = vrf_fib_table, | |
74b20582 | 1517 | .l3mdev_l3_rcv = vrf_l3_rcv, |
ebfc102c | 1518 | .l3mdev_l3_out = vrf_l3_out, |
35402e31 | 1519 | #if IS_ENABLED(CONFIG_IPV6) |
4c1feac5 | 1520 | .l3mdev_link_scope_lookup = vrf_link_scope_lookup, |
35402e31 | 1521 | #endif |
ee15ee5d DA |
1522 | }; |
1523 | ||
193125db DA |
1524 | static void vrf_get_drvinfo(struct net_device *dev, |
1525 | struct ethtool_drvinfo *info) | |
1526 | { | |
1527 | strlcpy(info->driver, DRV_NAME, sizeof(info->driver)); | |
1528 | strlcpy(info->version, DRV_VERSION, sizeof(info->version)); | |
1529 | } | |
1530 | ||
1531 | static const struct ethtool_ops vrf_ethtool_ops = { | |
1532 | .get_drvinfo = vrf_get_drvinfo, | |
1533 | }; | |
1534 | ||
1aa6c4f6 DA |
1535 | static inline size_t vrf_fib_rule_nl_size(void) |
1536 | { | |
1537 | size_t sz; | |
1538 | ||
1539 | sz = NLMSG_ALIGN(sizeof(struct fib_rule_hdr)); | |
1540 | sz += nla_total_size(sizeof(u8)); /* FRA_L3MDEV */ | |
1541 | sz += nla_total_size(sizeof(u32)); /* FRA_PRIORITY */ | |
1b71af60 | 1542 | sz += nla_total_size(sizeof(u8)); /* FRA_PROTOCOL */ |
1aa6c4f6 DA |
1543 | |
1544 | return sz; | |
1545 | } | |
1546 | ||
1547 | static int vrf_fib_rule(const struct net_device *dev, __u8 family, bool add_it) | |
1548 | { | |
1549 | struct fib_rule_hdr *frh; | |
1550 | struct nlmsghdr *nlh; | |
1551 | struct sk_buff *skb; | |
1552 | int err; | |
1553 | ||
dac91170 DA |
1554 | if ((family == AF_INET6 || family == RTNL_FAMILY_IP6MR) && |
1555 | !ipv6_mod_enabled()) | |
e4348637 DA |
1556 | return 0; |
1557 | ||
1aa6c4f6 DA |
1558 | skb = nlmsg_new(vrf_fib_rule_nl_size(), GFP_KERNEL); |
1559 | if (!skb) | |
1560 | return -ENOMEM; | |
1561 | ||
1562 | nlh = nlmsg_put(skb, 0, 0, 0, sizeof(*frh), 0); | |
1563 | if (!nlh) | |
1564 | goto nla_put_failure; | |
1565 | ||
1566 | /* rule only needs to appear once */ | |
426c87ca | 1567 | nlh->nlmsg_flags |= NLM_F_EXCL; |
1aa6c4f6 DA |
1568 | |
1569 | frh = nlmsg_data(nlh); | |
1570 | memset(frh, 0, sizeof(*frh)); | |
1571 | frh->family = family; | |
1572 | frh->action = FR_ACT_TO_TBL; | |
1b71af60 DS |
1573 | |
1574 | if (nla_put_u8(skb, FRA_PROTOCOL, RTPROT_KERNEL)) | |
1575 | goto nla_put_failure; | |
1aa6c4f6 | 1576 | |
18129a24 | 1577 | if (nla_put_u8(skb, FRA_L3MDEV, 1)) |
1aa6c4f6 DA |
1578 | goto nla_put_failure; |
1579 | ||
1580 | if (nla_put_u32(skb, FRA_PRIORITY, FIB_RULE_PREF)) | |
1581 | goto nla_put_failure; | |
1582 | ||
1583 | nlmsg_end(skb, nlh); | |
1584 | ||
1585 | /* fib_nl_{new,del}rule handling looks for net from skb->sk */ | |
1586 | skb->sk = dev_net(dev)->rtnl; | |
1587 | if (add_it) { | |
c21ef3e3 | 1588 | err = fib_nl_newrule(skb, nlh, NULL); |
1aa6c4f6 DA |
1589 | if (err == -EEXIST) |
1590 | err = 0; | |
1591 | } else { | |
c21ef3e3 | 1592 | err = fib_nl_delrule(skb, nlh, NULL); |
1aa6c4f6 DA |
1593 | if (err == -ENOENT) |
1594 | err = 0; | |
1595 | } | |
1596 | nlmsg_free(skb); | |
1597 | ||
1598 | return err; | |
1599 | ||
1600 | nla_put_failure: | |
1601 | nlmsg_free(skb); | |
1602 | ||
1603 | return -EMSGSIZE; | |
1604 | } | |
1605 | ||
1606 | static int vrf_add_fib_rules(const struct net_device *dev) | |
1607 | { | |
1608 | int err; | |
1609 | ||
1610 | err = vrf_fib_rule(dev, AF_INET, true); | |
1611 | if (err < 0) | |
1612 | goto out_err; | |
1613 | ||
1614 | err = vrf_fib_rule(dev, AF_INET6, true); | |
1615 | if (err < 0) | |
1616 | goto ipv6_err; | |
1617 | ||
e58e4159 DA |
1618 | #if IS_ENABLED(CONFIG_IP_MROUTE_MULTIPLE_TABLES) |
1619 | err = vrf_fib_rule(dev, RTNL_FAMILY_IPMR, true); | |
1620 | if (err < 0) | |
1621 | goto ipmr_err; | |
1622 | #endif | |
1623 | ||
e4a38c0c PR |
1624 | #if IS_ENABLED(CONFIG_IPV6_MROUTE_MULTIPLE_TABLES) |
1625 | err = vrf_fib_rule(dev, RTNL_FAMILY_IP6MR, true); | |
1626 | if (err < 0) | |
1627 | goto ip6mr_err; | |
1628 | #endif | |
1629 | ||
1aa6c4f6 DA |
1630 | return 0; |
1631 | ||
e4a38c0c PR |
1632 | #if IS_ENABLED(CONFIG_IPV6_MROUTE_MULTIPLE_TABLES) |
1633 | ip6mr_err: | |
1634 | vrf_fib_rule(dev, RTNL_FAMILY_IPMR, false); | |
1635 | #endif | |
1636 | ||
e58e4159 DA |
1637 | #if IS_ENABLED(CONFIG_IP_MROUTE_MULTIPLE_TABLES) |
1638 | ipmr_err: | |
1639 | vrf_fib_rule(dev, AF_INET6, false); | |
1640 | #endif | |
1641 | ||
1aa6c4f6 DA |
1642 | ipv6_err: |
1643 | vrf_fib_rule(dev, AF_INET, false); | |
1644 | ||
1645 | out_err: | |
1646 | netdev_err(dev, "Failed to add FIB rules.\n"); | |
1647 | return err; | |
1648 | } | |
1649 | ||
193125db DA |
1650 | static void vrf_setup(struct net_device *dev) |
1651 | { | |
1652 | ether_setup(dev); | |
1653 | ||
1654 | /* Initialize the device structure. */ | |
1655 | dev->netdev_ops = &vrf_netdev_ops; | |
ee15ee5d | 1656 | dev->l3mdev_ops = &vrf_l3mdev_ops; |
193125db | 1657 | dev->ethtool_ops = &vrf_ethtool_ops; |
cf124db5 | 1658 | dev->needs_free_netdev = true; |
193125db DA |
1659 | |
1660 | /* Fill in device structure with ethernet-generic values. */ | |
1661 | eth_hw_addr_random(dev); | |
1662 | ||
1663 | /* don't acquire vrf device's netif_tx_lock when transmitting */ | |
1664 | dev->features |= NETIF_F_LLTX; | |
1665 | ||
1666 | /* don't allow vrf devices to change network namespaces. */ | |
1667 | dev->features |= NETIF_F_NETNS_LOCAL; | |
7889681f DA |
1668 | |
1669 | /* does not make sense for a VLAN to be added to a vrf device */ | |
1670 | dev->features |= NETIF_F_VLAN_CHALLENGED; | |
1671 | ||
1672 | /* enable offload features */ | |
1673 | dev->features |= NETIF_F_GSO_SOFTWARE; | |
cb160394 | 1674 | dev->features |= NETIF_F_RXCSUM | NETIF_F_HW_CSUM | NETIF_F_SCTP_CRC; |
7889681f DA |
1675 | dev->features |= NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA; |
1676 | ||
1677 | dev->hw_features = dev->features; | |
1678 | dev->hw_enc_features = dev->features; | |
1679 | ||
1680 | /* default to no qdisc; user can add if desired */ | |
1681 | dev->priv_flags |= IFF_NO_QUEUE; | |
1017e098 | 1682 | dev->priv_flags |= IFF_NO_RX_HANDLER; |
6819e3f6 | 1683 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
ad49bc63 | 1684 | |
5055376a ML |
1685 | /* VRF devices do not care about MTU, but if the MTU is set |
1686 | * too low then the ipv4 and ipv6 protocols are disabled | |
1687 | * which breaks networking. | |
1688 | */ | |
1689 | dev->min_mtu = IPV6_MIN_MTU; | |
1690 | dev->max_mtu = ETH_MAX_MTU; | |
193125db DA |
1691 | } |
1692 | ||
a8b8a889 MS |
1693 | static int vrf_validate(struct nlattr *tb[], struct nlattr *data[], |
1694 | struct netlink_ext_ack *extack) | |
193125db DA |
1695 | { |
1696 | if (tb[IFLA_ADDRESS]) { | |
53b94835 DA |
1697 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) { |
1698 | NL_SET_ERR_MSG(extack, "Invalid hardware address"); | |
193125db | 1699 | return -EINVAL; |
53b94835 DA |
1700 | } |
1701 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) { | |
1702 | NL_SET_ERR_MSG(extack, "Invalid hardware address"); | |
193125db | 1703 | return -EADDRNOTAVAIL; |
53b94835 | 1704 | } |
193125db DA |
1705 | } |
1706 | return 0; | |
1707 | } | |
1708 | ||
1709 | static void vrf_dellink(struct net_device *dev, struct list_head *head) | |
1710 | { | |
f630c38e NA |
1711 | struct net_device *port_dev; |
1712 | struct list_head *iter; | |
1713 | ||
1714 | netdev_for_each_lower_dev(dev, port_dev, iter) | |
1715 | vrf_del_slave(dev, port_dev); | |
1716 | ||
c8baec38 AM |
1717 | vrf_map_unregister_dev(dev); |
1718 | ||
193125db DA |
1719 | unregister_netdevice_queue(dev, head); |
1720 | } | |
1721 | ||
1722 | static int vrf_newlink(struct net *src_net, struct net_device *dev, | |
7a3f4a18 MS |
1723 | struct nlattr *tb[], struct nlattr *data[], |
1724 | struct netlink_ext_ack *extack) | |
193125db DA |
1725 | { |
1726 | struct net_vrf *vrf = netdev_priv(dev); | |
c8baec38 | 1727 | struct netns_vrf *nn_vrf; |
097d3c95 DA |
1728 | bool *add_fib_rules; |
1729 | struct net *net; | |
1aa6c4f6 | 1730 | int err; |
193125db | 1731 | |
53b94835 DA |
1732 | if (!data || !data[IFLA_VRF_TABLE]) { |
1733 | NL_SET_ERR_MSG(extack, "VRF table id is missing"); | |
193125db | 1734 | return -EINVAL; |
53b94835 | 1735 | } |
193125db DA |
1736 | |
1737 | vrf->tb_id = nla_get_u32(data[IFLA_VRF_TABLE]); | |
53b94835 DA |
1738 | if (vrf->tb_id == RT_TABLE_UNSPEC) { |
1739 | NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VRF_TABLE], | |
1740 | "Invalid VRF table id"); | |
24c63bbc | 1741 | return -EINVAL; |
53b94835 | 1742 | } |
193125db | 1743 | |
007979ea | 1744 | dev->priv_flags |= IFF_L3MDEV_MASTER; |
193125db | 1745 | |
1aa6c4f6 DA |
1746 | err = register_netdevice(dev); |
1747 | if (err) | |
1748 | goto out; | |
1749 | ||
c8baec38 AM |
1750 | /* mapping between table_id and vrf; |
1751 | * note: such binding could not be done in the dev init function | |
1752 | * because dev->ifindex id is not available yet. | |
1753 | */ | |
1754 | vrf->ifindex = dev->ifindex; | |
1755 | ||
1756 | err = vrf_map_register_dev(dev, extack); | |
1757 | if (err) { | |
1758 | unregister_netdevice(dev); | |
1759 | goto out; | |
1760 | } | |
1761 | ||
097d3c95 | 1762 | net = dev_net(dev); |
c8baec38 AM |
1763 | nn_vrf = net_generic(net, vrf_net_id); |
1764 | ||
1765 | add_fib_rules = &nn_vrf->add_fib_rules; | |
097d3c95 | 1766 | if (*add_fib_rules) { |
1aa6c4f6 DA |
1767 | err = vrf_add_fib_rules(dev); |
1768 | if (err) { | |
c8baec38 | 1769 | vrf_map_unregister_dev(dev); |
1aa6c4f6 DA |
1770 | unregister_netdevice(dev); |
1771 | goto out; | |
1772 | } | |
097d3c95 | 1773 | *add_fib_rules = false; |
1aa6c4f6 DA |
1774 | } |
1775 | ||
1776 | out: | |
1777 | return err; | |
193125db DA |
1778 | } |
1779 | ||
1780 | static size_t vrf_nl_getsize(const struct net_device *dev) | |
1781 | { | |
1782 | return nla_total_size(sizeof(u32)); /* IFLA_VRF_TABLE */ | |
1783 | } | |
1784 | ||
1785 | static int vrf_fillinfo(struct sk_buff *skb, | |
1786 | const struct net_device *dev) | |
1787 | { | |
1788 | struct net_vrf *vrf = netdev_priv(dev); | |
1789 | ||
1790 | return nla_put_u32(skb, IFLA_VRF_TABLE, vrf->tb_id); | |
1791 | } | |
1792 | ||
67eb0331 DA |
1793 | static size_t vrf_get_slave_size(const struct net_device *bond_dev, |
1794 | const struct net_device *slave_dev) | |
1795 | { | |
1796 | return nla_total_size(sizeof(u32)); /* IFLA_VRF_PORT_TABLE */ | |
1797 | } | |
1798 | ||
1799 | static int vrf_fill_slave_info(struct sk_buff *skb, | |
1800 | const struct net_device *vrf_dev, | |
1801 | const struct net_device *slave_dev) | |
1802 | { | |
1803 | struct net_vrf *vrf = netdev_priv(vrf_dev); | |
1804 | ||
1805 | if (nla_put_u32(skb, IFLA_VRF_PORT_TABLE, vrf->tb_id)) | |
1806 | return -EMSGSIZE; | |
1807 | ||
1808 | return 0; | |
1809 | } | |
1810 | ||
193125db DA |
1811 | static const struct nla_policy vrf_nl_policy[IFLA_VRF_MAX + 1] = { |
1812 | [IFLA_VRF_TABLE] = { .type = NLA_U32 }, | |
1813 | }; | |
1814 | ||
1815 | static struct rtnl_link_ops vrf_link_ops __read_mostly = { | |
1816 | .kind = DRV_NAME, | |
1817 | .priv_size = sizeof(struct net_vrf), | |
1818 | ||
1819 | .get_size = vrf_nl_getsize, | |
1820 | .policy = vrf_nl_policy, | |
1821 | .validate = vrf_validate, | |
1822 | .fill_info = vrf_fillinfo, | |
1823 | ||
67eb0331 DA |
1824 | .get_slave_size = vrf_get_slave_size, |
1825 | .fill_slave_info = vrf_fill_slave_info, | |
1826 | ||
193125db DA |
1827 | .newlink = vrf_newlink, |
1828 | .dellink = vrf_dellink, | |
1829 | .setup = vrf_setup, | |
1830 | .maxtype = IFLA_VRF_MAX, | |
1831 | }; | |
1832 | ||
1833 | static int vrf_device_event(struct notifier_block *unused, | |
1834 | unsigned long event, void *ptr) | |
1835 | { | |
1836 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
1837 | ||
1838 | /* only care about unregister events to drop slave references */ | |
1839 | if (event == NETDEV_UNREGISTER) { | |
193125db DA |
1840 | struct net_device *vrf_dev; |
1841 | ||
fee6d4c7 | 1842 | if (!netif_is_l3_slave(dev)) |
193125db DA |
1843 | goto out; |
1844 | ||
58aa9087 NA |
1845 | vrf_dev = netdev_master_upper_dev_get(dev); |
1846 | vrf_del_slave(vrf_dev, dev); | |
193125db DA |
1847 | } |
1848 | out: | |
1849 | return NOTIFY_DONE; | |
1850 | } | |
1851 | ||
1852 | static struct notifier_block vrf_notifier_block __read_mostly = { | |
1853 | .notifier_call = vrf_device_event, | |
1854 | }; | |
1855 | ||
c8baec38 AM |
1856 | static int vrf_map_init(struct vrf_map *vmap) |
1857 | { | |
1858 | spin_lock_init(&vmap->vmap_lock); | |
1859 | hash_init(vmap->ht); | |
1860 | ||
1861 | vmap->strict_mode = false; | |
1862 | ||
1863 | return 0; | |
1864 | } | |
1865 | ||
1b6687e3 DA |
1866 | #ifdef CONFIG_SYSCTL |
1867 | static bool vrf_strict_mode(struct vrf_map *vmap) | |
1868 | { | |
1869 | bool strict_mode; | |
1870 | ||
1871 | vrf_map_lock(vmap); | |
1872 | strict_mode = vmap->strict_mode; | |
1873 | vrf_map_unlock(vmap); | |
1874 | ||
1875 | return strict_mode; | |
1876 | } | |
1877 | ||
1878 | static int vrf_strict_mode_change(struct vrf_map *vmap, bool new_mode) | |
1879 | { | |
1880 | bool *cur_mode; | |
1881 | int res = 0; | |
1882 | ||
1883 | vrf_map_lock(vmap); | |
1884 | ||
1885 | cur_mode = &vmap->strict_mode; | |
1886 | if (*cur_mode == new_mode) | |
1887 | goto unlock; | |
1888 | ||
1889 | if (*cur_mode) { | |
1890 | /* disable strict mode */ | |
1891 | *cur_mode = false; | |
1892 | } else { | |
1893 | if (vmap->shared_tables) { | |
1894 | /* we cannot allow strict_mode because there are some | |
1895 | * vrfs that share one or more tables. | |
1896 | */ | |
1897 | res = -EBUSY; | |
1898 | goto unlock; | |
1899 | } | |
1900 | ||
1901 | /* no tables are shared among vrfs, so we can go back | |
1902 | * to 1:1 association between a vrf with its table. | |
1903 | */ | |
1904 | *cur_mode = true; | |
1905 | } | |
1906 | ||
1907 | unlock: | |
1908 | vrf_map_unlock(vmap); | |
1909 | ||
1910 | return res; | |
1911 | } | |
1912 | ||
33306f1a AM |
1913 | static int vrf_shared_table_handler(struct ctl_table *table, int write, |
1914 | void *buffer, size_t *lenp, loff_t *ppos) | |
1915 | { | |
1916 | struct net *net = (struct net *)table->extra1; | |
1917 | struct vrf_map *vmap = netns_vrf_map(net); | |
1918 | int proc_strict_mode = 0; | |
1919 | struct ctl_table tmp = { | |
1920 | .procname = table->procname, | |
1921 | .data = &proc_strict_mode, | |
1922 | .maxlen = sizeof(int), | |
1923 | .mode = table->mode, | |
1924 | .extra1 = SYSCTL_ZERO, | |
1925 | .extra2 = SYSCTL_ONE, | |
1926 | }; | |
1927 | int ret; | |
1928 | ||
1929 | if (!write) | |
1930 | proc_strict_mode = vrf_strict_mode(vmap); | |
1931 | ||
1932 | ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); | |
1933 | ||
1934 | if (write && ret == 0) | |
1935 | ret = vrf_strict_mode_change(vmap, (bool)proc_strict_mode); | |
1936 | ||
1937 | return ret; | |
1938 | } | |
1939 | ||
1940 | static const struct ctl_table vrf_table[] = { | |
1941 | { | |
1942 | .procname = "strict_mode", | |
1943 | .data = NULL, | |
1944 | .maxlen = sizeof(int), | |
1945 | .mode = 0644, | |
1946 | .proc_handler = vrf_shared_table_handler, | |
1947 | /* set by the vrf_netns_init */ | |
1948 | .extra1 = NULL, | |
1949 | }, | |
1950 | { }, | |
1951 | }; | |
1952 | ||
1b6687e3 | 1953 | static int vrf_netns_init_sysctl(struct net *net, struct netns_vrf *nn_vrf) |
097d3c95 | 1954 | { |
33306f1a | 1955 | struct ctl_table *table; |
097d3c95 | 1956 | |
33306f1a AM |
1957 | table = kmemdup(vrf_table, sizeof(vrf_table), GFP_KERNEL); |
1958 | if (!table) | |
1959 | return -ENOMEM; | |
1960 | ||
1961 | /* init the extra1 parameter with the reference to current netns */ | |
1962 | table[0].extra1 = net; | |
1963 | ||
1964 | nn_vrf->ctl_hdr = register_net_sysctl(net, "net/vrf", table); | |
1965 | if (!nn_vrf->ctl_hdr) { | |
1b6687e3 DA |
1966 | kfree(table); |
1967 | return -ENOMEM; | |
33306f1a AM |
1968 | } |
1969 | ||
097d3c95 | 1970 | return 0; |
33306f1a AM |
1971 | } |
1972 | ||
1b6687e3 | 1973 | static void vrf_netns_exit_sysctl(struct net *net) |
33306f1a AM |
1974 | { |
1975 | struct netns_vrf *nn_vrf = net_generic(net, vrf_net_id); | |
1976 | struct ctl_table *table; | |
1977 | ||
1978 | table = nn_vrf->ctl_hdr->ctl_table_arg; | |
1979 | unregister_net_sysctl_table(nn_vrf->ctl_hdr); | |
1980 | kfree(table); | |
097d3c95 | 1981 | } |
1b6687e3 DA |
1982 | #else |
1983 | static int vrf_netns_init_sysctl(struct net *net, struct netns_vrf *nn_vrf) | |
1984 | { | |
1985 | return 0; | |
1986 | } | |
1987 | ||
1988 | static void vrf_netns_exit_sysctl(struct net *net) | |
1989 | { | |
1990 | } | |
1991 | #endif | |
1992 | ||
1993 | /* Initialize per network namespace state */ | |
1994 | static int __net_init vrf_netns_init(struct net *net) | |
1995 | { | |
1996 | struct netns_vrf *nn_vrf = net_generic(net, vrf_net_id); | |
1997 | ||
1998 | nn_vrf->add_fib_rules = true; | |
1999 | vrf_map_init(&nn_vrf->vmap); | |
2000 | ||
2001 | return vrf_netns_init_sysctl(net, nn_vrf); | |
2002 | } | |
2003 | ||
2004 | static void __net_exit vrf_netns_exit(struct net *net) | |
2005 | { | |
2006 | vrf_netns_exit_sysctl(net); | |
2007 | } | |
097d3c95 DA |
2008 | |
2009 | static struct pernet_operations vrf_net_ops __net_initdata = { | |
2010 | .init = vrf_netns_init, | |
33306f1a | 2011 | .exit = vrf_netns_exit, |
097d3c95 | 2012 | .id = &vrf_net_id, |
c8baec38 | 2013 | .size = sizeof(struct netns_vrf), |
097d3c95 DA |
2014 | }; |
2015 | ||
193125db DA |
2016 | static int __init vrf_init_module(void) |
2017 | { | |
2018 | int rc; | |
2019 | ||
193125db DA |
2020 | register_netdevice_notifier(&vrf_notifier_block); |
2021 | ||
097d3c95 | 2022 | rc = register_pernet_subsys(&vrf_net_ops); |
193125db DA |
2023 | if (rc < 0) |
2024 | goto error; | |
2025 | ||
a59a8ffd AM |
2026 | rc = l3mdev_table_lookup_register(L3MDEV_TYPE_VRF, |
2027 | vrf_ifindex_lookup_by_table_id); | |
2028 | if (rc < 0) | |
2029 | goto unreg_pernet; | |
2030 | ||
097d3c95 | 2031 | rc = rtnl_link_register(&vrf_link_ops); |
a59a8ffd AM |
2032 | if (rc < 0) |
2033 | goto table_lookup_unreg; | |
097d3c95 | 2034 | |
193125db DA |
2035 | return 0; |
2036 | ||
a59a8ffd AM |
2037 | table_lookup_unreg: |
2038 | l3mdev_table_lookup_unregister(L3MDEV_TYPE_VRF, | |
2039 | vrf_ifindex_lookup_by_table_id); | |
2040 | ||
2041 | unreg_pernet: | |
2042 | unregister_pernet_subsys(&vrf_net_ops); | |
2043 | ||
193125db DA |
2044 | error: |
2045 | unregister_netdevice_notifier(&vrf_notifier_block); | |
193125db DA |
2046 | return rc; |
2047 | } | |
2048 | ||
193125db | 2049 | module_init(vrf_init_module); |
193125db DA |
2050 | MODULE_AUTHOR("Shrijeet Mukherjee, David Ahern"); |
2051 | MODULE_DESCRIPTION("Device driver to instantiate VRF domains"); | |
2052 | MODULE_LICENSE("GPL"); | |
2053 | MODULE_ALIAS_RTNL_LINK(DRV_NAME); | |
2054 | MODULE_VERSION(DRV_VERSION); |