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Merge branch 'linux-4.15' of git://github.com/skeggsb/linux into drm-fixes
[mirror_ubuntu-bionic-kernel.git] / drivers / net / vrf.c
1 /*
2 * vrf.c: device driver to encapsulate a VRF space
3 *
4 * Copyright (c) 2015 Cumulus Networks. All rights reserved.
5 * Copyright (c) 2015 Shrijeet Mukherjee <shm@cumulusnetworks.com>
6 * Copyright (c) 2015 David Ahern <dsa@cumulusnetworks.com>
7 *
8 * Based on dummy, team and ipvlan drivers
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 */
15
16 #include <linux/module.h>
17 #include <linux/kernel.h>
18 #include <linux/netdevice.h>
19 #include <linux/etherdevice.h>
20 #include <linux/ip.h>
21 #include <linux/init.h>
22 #include <linux/moduleparam.h>
23 #include <linux/netfilter.h>
24 #include <linux/rtnetlink.h>
25 #include <net/rtnetlink.h>
26 #include <linux/u64_stats_sync.h>
27 #include <linux/hashtable.h>
28
29 #include <linux/inetdevice.h>
30 #include <net/arp.h>
31 #include <net/ip.h>
32 #include <net/ip_fib.h>
33 #include <net/ip6_fib.h>
34 #include <net/ip6_route.h>
35 #include <net/route.h>
36 #include <net/addrconf.h>
37 #include <net/l3mdev.h>
38 #include <net/fib_rules.h>
39 #include <net/netns/generic.h>
40
41 #define DRV_NAME "vrf"
42 #define DRV_VERSION "1.0"
43
44 #define FIB_RULE_PREF 1000 /* default preference for FIB rules */
45
46 static unsigned int vrf_net_id;
47
48 struct net_vrf {
49 struct rtable __rcu *rth;
50 struct rt6_info __rcu *rt6;
51 u32 tb_id;
52 };
53
54 struct pcpu_dstats {
55 u64 tx_pkts;
56 u64 tx_bytes;
57 u64 tx_drps;
58 u64 rx_pkts;
59 u64 rx_bytes;
60 u64 rx_drps;
61 struct u64_stats_sync syncp;
62 };
63
64 static void vrf_rx_stats(struct net_device *dev, int len)
65 {
66 struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats);
67
68 u64_stats_update_begin(&dstats->syncp);
69 dstats->rx_pkts++;
70 dstats->rx_bytes += len;
71 u64_stats_update_end(&dstats->syncp);
72 }
73
74 static void vrf_tx_error(struct net_device *vrf_dev, struct sk_buff *skb)
75 {
76 vrf_dev->stats.tx_errors++;
77 kfree_skb(skb);
78 }
79
80 static void vrf_get_stats64(struct net_device *dev,
81 struct rtnl_link_stats64 *stats)
82 {
83 int i;
84
85 for_each_possible_cpu(i) {
86 const struct pcpu_dstats *dstats;
87 u64 tbytes, tpkts, tdrops, rbytes, rpkts;
88 unsigned int start;
89
90 dstats = per_cpu_ptr(dev->dstats, i);
91 do {
92 start = u64_stats_fetch_begin_irq(&dstats->syncp);
93 tbytes = dstats->tx_bytes;
94 tpkts = dstats->tx_pkts;
95 tdrops = dstats->tx_drps;
96 rbytes = dstats->rx_bytes;
97 rpkts = dstats->rx_pkts;
98 } while (u64_stats_fetch_retry_irq(&dstats->syncp, start));
99 stats->tx_bytes += tbytes;
100 stats->tx_packets += tpkts;
101 stats->tx_dropped += tdrops;
102 stats->rx_bytes += rbytes;
103 stats->rx_packets += rpkts;
104 }
105 }
106
107 /* by default VRF devices do not have a qdisc and are expected
108 * to be created with only a single queue.
109 */
110 static bool qdisc_tx_is_default(const struct net_device *dev)
111 {
112 struct netdev_queue *txq;
113 struct Qdisc *qdisc;
114
115 if (dev->num_tx_queues > 1)
116 return false;
117
118 txq = netdev_get_tx_queue(dev, 0);
119 qdisc = rcu_access_pointer(txq->qdisc);
120
121 return !qdisc->enqueue;
122 }
123
124 /* Local traffic destined to local address. Reinsert the packet to rx
125 * path, similar to loopback handling.
126 */
127 static int vrf_local_xmit(struct sk_buff *skb, struct net_device *dev,
128 struct dst_entry *dst)
129 {
130 int len = skb->len;
131
132 skb_orphan(skb);
133
134 skb_dst_set(skb, dst);
135
136 /* set pkt_type to avoid skb hitting packet taps twice -
137 * once on Tx and again in Rx processing
138 */
139 skb->pkt_type = PACKET_LOOPBACK;
140
141 skb->protocol = eth_type_trans(skb, dev);
142
143 if (likely(netif_rx(skb) == NET_RX_SUCCESS))
144 vrf_rx_stats(dev, len);
145 else
146 this_cpu_inc(dev->dstats->rx_drps);
147
148 return NETDEV_TX_OK;
149 }
150
151 #if IS_ENABLED(CONFIG_IPV6)
152 static int vrf_ip6_local_out(struct net *net, struct sock *sk,
153 struct sk_buff *skb)
154 {
155 int err;
156
157 err = nf_hook(NFPROTO_IPV6, NF_INET_LOCAL_OUT, net,
158 sk, skb, NULL, skb_dst(skb)->dev, dst_output);
159
160 if (likely(err == 1))
161 err = dst_output(net, sk, skb);
162
163 return err;
164 }
165
166 static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb,
167 struct net_device *dev)
168 {
169 const struct ipv6hdr *iph = ipv6_hdr(skb);
170 struct net *net = dev_net(skb->dev);
171 struct flowi6 fl6 = {
172 /* needed to match OIF rule */
173 .flowi6_oif = dev->ifindex,
174 .flowi6_iif = LOOPBACK_IFINDEX,
175 .daddr = iph->daddr,
176 .saddr = iph->saddr,
177 .flowlabel = ip6_flowinfo(iph),
178 .flowi6_mark = skb->mark,
179 .flowi6_proto = iph->nexthdr,
180 .flowi6_flags = FLOWI_FLAG_SKIP_NH_OIF,
181 };
182 int ret = NET_XMIT_DROP;
183 struct dst_entry *dst;
184 struct dst_entry *dst_null = &net->ipv6.ip6_null_entry->dst;
185
186 dst = ip6_route_output(net, NULL, &fl6);
187 if (dst == dst_null)
188 goto err;
189
190 skb_dst_drop(skb);
191
192 /* if dst.dev is loopback or the VRF device again this is locally
193 * originated traffic destined to a local address. Short circuit
194 * to Rx path
195 */
196 if (dst->dev == dev)
197 return vrf_local_xmit(skb, dev, dst);
198
199 skb_dst_set(skb, dst);
200
201 /* strip the ethernet header added for pass through VRF device */
202 __skb_pull(skb, skb_network_offset(skb));
203
204 ret = vrf_ip6_local_out(net, skb->sk, skb);
205 if (unlikely(net_xmit_eval(ret)))
206 dev->stats.tx_errors++;
207 else
208 ret = NET_XMIT_SUCCESS;
209
210 return ret;
211 err:
212 vrf_tx_error(dev, skb);
213 return NET_XMIT_DROP;
214 }
215 #else
216 static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb,
217 struct net_device *dev)
218 {
219 vrf_tx_error(dev, skb);
220 return NET_XMIT_DROP;
221 }
222 #endif
223
224 /* based on ip_local_out; can't use it b/c the dst is switched pointing to us */
225 static int vrf_ip_local_out(struct net *net, struct sock *sk,
226 struct sk_buff *skb)
227 {
228 int err;
229
230 err = nf_hook(NFPROTO_IPV4, NF_INET_LOCAL_OUT, net, sk,
231 skb, NULL, skb_dst(skb)->dev, dst_output);
232 if (likely(err == 1))
233 err = dst_output(net, sk, skb);
234
235 return err;
236 }
237
238 static netdev_tx_t vrf_process_v4_outbound(struct sk_buff *skb,
239 struct net_device *vrf_dev)
240 {
241 struct iphdr *ip4h = ip_hdr(skb);
242 int ret = NET_XMIT_DROP;
243 struct flowi4 fl4 = {
244 /* needed to match OIF rule */
245 .flowi4_oif = vrf_dev->ifindex,
246 .flowi4_iif = LOOPBACK_IFINDEX,
247 .flowi4_tos = RT_TOS(ip4h->tos),
248 .flowi4_flags = FLOWI_FLAG_ANYSRC | FLOWI_FLAG_SKIP_NH_OIF,
249 .flowi4_proto = ip4h->protocol,
250 .daddr = ip4h->daddr,
251 .saddr = ip4h->saddr,
252 };
253 struct net *net = dev_net(vrf_dev);
254 struct rtable *rt;
255
256 rt = ip_route_output_flow(net, &fl4, NULL);
257 if (IS_ERR(rt))
258 goto err;
259
260 skb_dst_drop(skb);
261
262 /* if dst.dev is loopback or the VRF device again this is locally
263 * originated traffic destined to a local address. Short circuit
264 * to Rx path
265 */
266 if (rt->dst.dev == vrf_dev)
267 return vrf_local_xmit(skb, vrf_dev, &rt->dst);
268
269 skb_dst_set(skb, &rt->dst);
270
271 /* strip the ethernet header added for pass through VRF device */
272 __skb_pull(skb, skb_network_offset(skb));
273
274 if (!ip4h->saddr) {
275 ip4h->saddr = inet_select_addr(skb_dst(skb)->dev, 0,
276 RT_SCOPE_LINK);
277 }
278
279 ret = vrf_ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb);
280 if (unlikely(net_xmit_eval(ret)))
281 vrf_dev->stats.tx_errors++;
282 else
283 ret = NET_XMIT_SUCCESS;
284
285 out:
286 return ret;
287 err:
288 vrf_tx_error(vrf_dev, skb);
289 goto out;
290 }
291
292 static netdev_tx_t is_ip_tx_frame(struct sk_buff *skb, struct net_device *dev)
293 {
294 switch (skb->protocol) {
295 case htons(ETH_P_IP):
296 return vrf_process_v4_outbound(skb, dev);
297 case htons(ETH_P_IPV6):
298 return vrf_process_v6_outbound(skb, dev);
299 default:
300 vrf_tx_error(dev, skb);
301 return NET_XMIT_DROP;
302 }
303 }
304
305 static netdev_tx_t vrf_xmit(struct sk_buff *skb, struct net_device *dev)
306 {
307 int len = skb->len;
308 netdev_tx_t ret = is_ip_tx_frame(skb, dev);
309
310 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
311 struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats);
312
313 u64_stats_update_begin(&dstats->syncp);
314 dstats->tx_pkts++;
315 dstats->tx_bytes += len;
316 u64_stats_update_end(&dstats->syncp);
317 } else {
318 this_cpu_inc(dev->dstats->tx_drps);
319 }
320
321 return ret;
322 }
323
324 static int vrf_finish_direct(struct net *net, struct sock *sk,
325 struct sk_buff *skb)
326 {
327 struct net_device *vrf_dev = skb->dev;
328
329 if (!list_empty(&vrf_dev->ptype_all) &&
330 likely(skb_headroom(skb) >= ETH_HLEN)) {
331 struct ethhdr *eth = skb_push(skb, ETH_HLEN);
332
333 ether_addr_copy(eth->h_source, vrf_dev->dev_addr);
334 eth_zero_addr(eth->h_dest);
335 eth->h_proto = skb->protocol;
336
337 rcu_read_lock_bh();
338 dev_queue_xmit_nit(skb, vrf_dev);
339 rcu_read_unlock_bh();
340
341 skb_pull(skb, ETH_HLEN);
342 }
343
344 return 1;
345 }
346
347 #if IS_ENABLED(CONFIG_IPV6)
348 /* modelled after ip6_finish_output2 */
349 static int vrf_finish_output6(struct net *net, struct sock *sk,
350 struct sk_buff *skb)
351 {
352 struct dst_entry *dst = skb_dst(skb);
353 struct net_device *dev = dst->dev;
354 struct neighbour *neigh;
355 struct in6_addr *nexthop;
356 int ret;
357
358 nf_reset(skb);
359
360 skb->protocol = htons(ETH_P_IPV6);
361 skb->dev = dev;
362
363 rcu_read_lock_bh();
364 nexthop = rt6_nexthop((struct rt6_info *)dst, &ipv6_hdr(skb)->daddr);
365 neigh = __ipv6_neigh_lookup_noref(dst->dev, nexthop);
366 if (unlikely(!neigh))
367 neigh = __neigh_create(&nd_tbl, nexthop, dst->dev, false);
368 if (!IS_ERR(neigh)) {
369 sock_confirm_neigh(skb, neigh);
370 ret = neigh_output(neigh, skb);
371 rcu_read_unlock_bh();
372 return ret;
373 }
374 rcu_read_unlock_bh();
375
376 IP6_INC_STATS(dev_net(dst->dev),
377 ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES);
378 kfree_skb(skb);
379 return -EINVAL;
380 }
381
382 /* modelled after ip6_output */
383 static int vrf_output6(struct net *net, struct sock *sk, struct sk_buff *skb)
384 {
385 return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING,
386 net, sk, skb, NULL, skb_dst(skb)->dev,
387 vrf_finish_output6,
388 !(IP6CB(skb)->flags & IP6SKB_REROUTED));
389 }
390
391 /* set dst on skb to send packet to us via dev_xmit path. Allows
392 * packet to go through device based features such as qdisc, netfilter
393 * hooks and packet sockets with skb->dev set to vrf device.
394 */
395 static struct sk_buff *vrf_ip6_out_redirect(struct net_device *vrf_dev,
396 struct sk_buff *skb)
397 {
398 struct net_vrf *vrf = netdev_priv(vrf_dev);
399 struct dst_entry *dst = NULL;
400 struct rt6_info *rt6;
401
402 rcu_read_lock();
403
404 rt6 = rcu_dereference(vrf->rt6);
405 if (likely(rt6)) {
406 dst = &rt6->dst;
407 dst_hold(dst);
408 }
409
410 rcu_read_unlock();
411
412 if (unlikely(!dst)) {
413 vrf_tx_error(vrf_dev, skb);
414 return NULL;
415 }
416
417 skb_dst_drop(skb);
418 skb_dst_set(skb, dst);
419
420 return skb;
421 }
422
423 static int vrf_output6_direct(struct net *net, struct sock *sk,
424 struct sk_buff *skb)
425 {
426 skb->protocol = htons(ETH_P_IPV6);
427
428 return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING,
429 net, sk, skb, NULL, skb->dev,
430 vrf_finish_direct,
431 !(IPCB(skb)->flags & IPSKB_REROUTED));
432 }
433
434 static struct sk_buff *vrf_ip6_out_direct(struct net_device *vrf_dev,
435 struct sock *sk,
436 struct sk_buff *skb)
437 {
438 struct net *net = dev_net(vrf_dev);
439 int err;
440
441 skb->dev = vrf_dev;
442
443 err = nf_hook(NFPROTO_IPV6, NF_INET_LOCAL_OUT, net, sk,
444 skb, NULL, vrf_dev, vrf_output6_direct);
445
446 if (likely(err == 1))
447 err = vrf_output6_direct(net, sk, skb);
448
449 /* reset skb device */
450 if (likely(err == 1))
451 nf_reset(skb);
452 else
453 skb = NULL;
454
455 return skb;
456 }
457
458 static struct sk_buff *vrf_ip6_out(struct net_device *vrf_dev,
459 struct sock *sk,
460 struct sk_buff *skb)
461 {
462 /* don't divert link scope packets */
463 if (rt6_need_strict(&ipv6_hdr(skb)->daddr))
464 return skb;
465
466 if (qdisc_tx_is_default(vrf_dev))
467 return vrf_ip6_out_direct(vrf_dev, sk, skb);
468
469 return vrf_ip6_out_redirect(vrf_dev, skb);
470 }
471
472 /* holding rtnl */
473 static void vrf_rt6_release(struct net_device *dev, struct net_vrf *vrf)
474 {
475 struct rt6_info *rt6 = rtnl_dereference(vrf->rt6);
476 struct net *net = dev_net(dev);
477 struct dst_entry *dst;
478
479 RCU_INIT_POINTER(vrf->rt6, NULL);
480 synchronize_rcu();
481
482 /* move dev in dst's to loopback so this VRF device can be deleted
483 * - based on dst_ifdown
484 */
485 if (rt6) {
486 dst = &rt6->dst;
487 dev_put(dst->dev);
488 dst->dev = net->loopback_dev;
489 dev_hold(dst->dev);
490 dst_release(dst);
491 }
492 }
493
494 static int vrf_rt6_create(struct net_device *dev)
495 {
496 int flags = DST_HOST | DST_NOPOLICY | DST_NOXFRM;
497 struct net_vrf *vrf = netdev_priv(dev);
498 struct net *net = dev_net(dev);
499 struct fib6_table *rt6i_table;
500 struct rt6_info *rt6;
501 int rc = -ENOMEM;
502
503 /* IPv6 can be CONFIG enabled and then disabled runtime */
504 if (!ipv6_mod_enabled())
505 return 0;
506
507 rt6i_table = fib6_new_table(net, vrf->tb_id);
508 if (!rt6i_table)
509 goto out;
510
511 /* create a dst for routing packets out a VRF device */
512 rt6 = ip6_dst_alloc(net, dev, flags);
513 if (!rt6)
514 goto out;
515
516 rt6->rt6i_table = rt6i_table;
517 rt6->dst.output = vrf_output6;
518
519 rcu_assign_pointer(vrf->rt6, rt6);
520
521 rc = 0;
522 out:
523 return rc;
524 }
525 #else
526 static struct sk_buff *vrf_ip6_out(struct net_device *vrf_dev,
527 struct sock *sk,
528 struct sk_buff *skb)
529 {
530 return skb;
531 }
532
533 static void vrf_rt6_release(struct net_device *dev, struct net_vrf *vrf)
534 {
535 }
536
537 static int vrf_rt6_create(struct net_device *dev)
538 {
539 return 0;
540 }
541 #endif
542
543 /* modelled after ip_finish_output2 */
544 static int vrf_finish_output(struct net *net, struct sock *sk, struct sk_buff *skb)
545 {
546 struct dst_entry *dst = skb_dst(skb);
547 struct rtable *rt = (struct rtable *)dst;
548 struct net_device *dev = dst->dev;
549 unsigned int hh_len = LL_RESERVED_SPACE(dev);
550 struct neighbour *neigh;
551 u32 nexthop;
552 int ret = -EINVAL;
553
554 nf_reset(skb);
555
556 /* Be paranoid, rather than too clever. */
557 if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) {
558 struct sk_buff *skb2;
559
560 skb2 = skb_realloc_headroom(skb, LL_RESERVED_SPACE(dev));
561 if (!skb2) {
562 ret = -ENOMEM;
563 goto err;
564 }
565 if (skb->sk)
566 skb_set_owner_w(skb2, skb->sk);
567
568 consume_skb(skb);
569 skb = skb2;
570 }
571
572 rcu_read_lock_bh();
573
574 nexthop = (__force u32)rt_nexthop(rt, ip_hdr(skb)->daddr);
575 neigh = __ipv4_neigh_lookup_noref(dev, nexthop);
576 if (unlikely(!neigh))
577 neigh = __neigh_create(&arp_tbl, &nexthop, dev, false);
578 if (!IS_ERR(neigh)) {
579 sock_confirm_neigh(skb, neigh);
580 ret = neigh_output(neigh, skb);
581 }
582
583 rcu_read_unlock_bh();
584 err:
585 if (unlikely(ret < 0))
586 vrf_tx_error(skb->dev, skb);
587 return ret;
588 }
589
590 static int vrf_output(struct net *net, struct sock *sk, struct sk_buff *skb)
591 {
592 struct net_device *dev = skb_dst(skb)->dev;
593
594 IP_UPD_PO_STATS(net, IPSTATS_MIB_OUT, skb->len);
595
596 skb->dev = dev;
597 skb->protocol = htons(ETH_P_IP);
598
599 return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING,
600 net, sk, skb, NULL, dev,
601 vrf_finish_output,
602 !(IPCB(skb)->flags & IPSKB_REROUTED));
603 }
604
605 /* set dst on skb to send packet to us via dev_xmit path. Allows
606 * packet to go through device based features such as qdisc, netfilter
607 * hooks and packet sockets with skb->dev set to vrf device.
608 */
609 static struct sk_buff *vrf_ip_out_redirect(struct net_device *vrf_dev,
610 struct sk_buff *skb)
611 {
612 struct net_vrf *vrf = netdev_priv(vrf_dev);
613 struct dst_entry *dst = NULL;
614 struct rtable *rth;
615
616 rcu_read_lock();
617
618 rth = rcu_dereference(vrf->rth);
619 if (likely(rth)) {
620 dst = &rth->dst;
621 dst_hold(dst);
622 }
623
624 rcu_read_unlock();
625
626 if (unlikely(!dst)) {
627 vrf_tx_error(vrf_dev, skb);
628 return NULL;
629 }
630
631 skb_dst_drop(skb);
632 skb_dst_set(skb, dst);
633
634 return skb;
635 }
636
637 static int vrf_output_direct(struct net *net, struct sock *sk,
638 struct sk_buff *skb)
639 {
640 skb->protocol = htons(ETH_P_IP);
641
642 return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING,
643 net, sk, skb, NULL, skb->dev,
644 vrf_finish_direct,
645 !(IPCB(skb)->flags & IPSKB_REROUTED));
646 }
647
648 static struct sk_buff *vrf_ip_out_direct(struct net_device *vrf_dev,
649 struct sock *sk,
650 struct sk_buff *skb)
651 {
652 struct net *net = dev_net(vrf_dev);
653 int err;
654
655 skb->dev = vrf_dev;
656
657 err = nf_hook(NFPROTO_IPV4, NF_INET_LOCAL_OUT, net, sk,
658 skb, NULL, vrf_dev, vrf_output_direct);
659
660 if (likely(err == 1))
661 err = vrf_output_direct(net, sk, skb);
662
663 /* reset skb device */
664 if (likely(err == 1))
665 nf_reset(skb);
666 else
667 skb = NULL;
668
669 return skb;
670 }
671
672 static struct sk_buff *vrf_ip_out(struct net_device *vrf_dev,
673 struct sock *sk,
674 struct sk_buff *skb)
675 {
676 /* don't divert multicast */
677 if (ipv4_is_multicast(ip_hdr(skb)->daddr))
678 return skb;
679
680 if (qdisc_tx_is_default(vrf_dev))
681 return vrf_ip_out_direct(vrf_dev, sk, skb);
682
683 return vrf_ip_out_redirect(vrf_dev, skb);
684 }
685
686 /* called with rcu lock held */
687 static struct sk_buff *vrf_l3_out(struct net_device *vrf_dev,
688 struct sock *sk,
689 struct sk_buff *skb,
690 u16 proto)
691 {
692 switch (proto) {
693 case AF_INET:
694 return vrf_ip_out(vrf_dev, sk, skb);
695 case AF_INET6:
696 return vrf_ip6_out(vrf_dev, sk, skb);
697 }
698
699 return skb;
700 }
701
702 /* holding rtnl */
703 static void vrf_rtable_release(struct net_device *dev, struct net_vrf *vrf)
704 {
705 struct rtable *rth = rtnl_dereference(vrf->rth);
706 struct net *net = dev_net(dev);
707 struct dst_entry *dst;
708
709 RCU_INIT_POINTER(vrf->rth, NULL);
710 synchronize_rcu();
711
712 /* move dev in dst's to loopback so this VRF device can be deleted
713 * - based on dst_ifdown
714 */
715 if (rth) {
716 dst = &rth->dst;
717 dev_put(dst->dev);
718 dst->dev = net->loopback_dev;
719 dev_hold(dst->dev);
720 dst_release(dst);
721 }
722 }
723
724 static int vrf_rtable_create(struct net_device *dev)
725 {
726 struct net_vrf *vrf = netdev_priv(dev);
727 struct rtable *rth;
728
729 if (!fib_new_table(dev_net(dev), vrf->tb_id))
730 return -ENOMEM;
731
732 /* create a dst for routing packets out through a VRF device */
733 rth = rt_dst_alloc(dev, 0, RTN_UNICAST, 1, 1, 0);
734 if (!rth)
735 return -ENOMEM;
736
737 rth->dst.output = vrf_output;
738 rth->rt_table_id = vrf->tb_id;
739
740 rcu_assign_pointer(vrf->rth, rth);
741
742 return 0;
743 }
744
745 /**************************** device handling ********************/
746
747 /* cycle interface to flush neighbor cache and move routes across tables */
748 static void cycle_netdev(struct net_device *dev)
749 {
750 unsigned int flags = dev->flags;
751 int ret;
752
753 if (!netif_running(dev))
754 return;
755
756 ret = dev_change_flags(dev, flags & ~IFF_UP);
757 if (ret >= 0)
758 ret = dev_change_flags(dev, flags);
759
760 if (ret < 0) {
761 netdev_err(dev,
762 "Failed to cycle device %s; route tables might be wrong!\n",
763 dev->name);
764 }
765 }
766
767 static int do_vrf_add_slave(struct net_device *dev, struct net_device *port_dev,
768 struct netlink_ext_ack *extack)
769 {
770 int ret;
771
772 /* do not allow loopback device to be enslaved to a VRF.
773 * The vrf device acts as the loopback for the vrf.
774 */
775 if (port_dev == dev_net(dev)->loopback_dev) {
776 NL_SET_ERR_MSG(extack,
777 "Can not enslave loopback device to a VRF");
778 return -EOPNOTSUPP;
779 }
780
781 port_dev->priv_flags |= IFF_L3MDEV_SLAVE;
782 ret = netdev_master_upper_dev_link(port_dev, dev, NULL, NULL, extack);
783 if (ret < 0)
784 goto err;
785
786 cycle_netdev(port_dev);
787
788 return 0;
789
790 err:
791 port_dev->priv_flags &= ~IFF_L3MDEV_SLAVE;
792 return ret;
793 }
794
795 static int vrf_add_slave(struct net_device *dev, struct net_device *port_dev,
796 struct netlink_ext_ack *extack)
797 {
798 if (netif_is_l3_master(port_dev)) {
799 NL_SET_ERR_MSG(extack,
800 "Can not enslave an L3 master device to a VRF");
801 return -EINVAL;
802 }
803
804 if (netif_is_l3_slave(port_dev))
805 return -EINVAL;
806
807 return do_vrf_add_slave(dev, port_dev, extack);
808 }
809
810 /* inverse of do_vrf_add_slave */
811 static int do_vrf_del_slave(struct net_device *dev, struct net_device *port_dev)
812 {
813 netdev_upper_dev_unlink(port_dev, dev);
814 port_dev->priv_flags &= ~IFF_L3MDEV_SLAVE;
815
816 cycle_netdev(port_dev);
817
818 return 0;
819 }
820
821 static int vrf_del_slave(struct net_device *dev, struct net_device *port_dev)
822 {
823 return do_vrf_del_slave(dev, port_dev);
824 }
825
826 static void vrf_dev_uninit(struct net_device *dev)
827 {
828 struct net_vrf *vrf = netdev_priv(dev);
829
830 vrf_rtable_release(dev, vrf);
831 vrf_rt6_release(dev, vrf);
832
833 free_percpu(dev->dstats);
834 dev->dstats = NULL;
835 }
836
837 static int vrf_dev_init(struct net_device *dev)
838 {
839 struct net_vrf *vrf = netdev_priv(dev);
840
841 dev->dstats = netdev_alloc_pcpu_stats(struct pcpu_dstats);
842 if (!dev->dstats)
843 goto out_nomem;
844
845 /* create the default dst which points back to us */
846 if (vrf_rtable_create(dev) != 0)
847 goto out_stats;
848
849 if (vrf_rt6_create(dev) != 0)
850 goto out_rth;
851
852 dev->flags = IFF_MASTER | IFF_NOARP;
853
854 /* MTU is irrelevant for VRF device; set to 64k similar to lo */
855 dev->mtu = 64 * 1024;
856
857 /* similarly, oper state is irrelevant; set to up to avoid confusion */
858 dev->operstate = IF_OPER_UP;
859 netdev_lockdep_set_classes(dev);
860 return 0;
861
862 out_rth:
863 vrf_rtable_release(dev, vrf);
864 out_stats:
865 free_percpu(dev->dstats);
866 dev->dstats = NULL;
867 out_nomem:
868 return -ENOMEM;
869 }
870
871 static const struct net_device_ops vrf_netdev_ops = {
872 .ndo_init = vrf_dev_init,
873 .ndo_uninit = vrf_dev_uninit,
874 .ndo_start_xmit = vrf_xmit,
875 .ndo_get_stats64 = vrf_get_stats64,
876 .ndo_add_slave = vrf_add_slave,
877 .ndo_del_slave = vrf_del_slave,
878 };
879
880 static u32 vrf_fib_table(const struct net_device *dev)
881 {
882 struct net_vrf *vrf = netdev_priv(dev);
883
884 return vrf->tb_id;
885 }
886
887 static int vrf_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb)
888 {
889 kfree_skb(skb);
890 return 0;
891 }
892
893 static struct sk_buff *vrf_rcv_nfhook(u8 pf, unsigned int hook,
894 struct sk_buff *skb,
895 struct net_device *dev)
896 {
897 struct net *net = dev_net(dev);
898
899 if (nf_hook(pf, hook, net, NULL, skb, dev, NULL, vrf_rcv_finish) != 1)
900 skb = NULL; /* kfree_skb(skb) handled by nf code */
901
902 return skb;
903 }
904
905 #if IS_ENABLED(CONFIG_IPV6)
906 /* neighbor handling is done with actual device; do not want
907 * to flip skb->dev for those ndisc packets. This really fails
908 * for multiple next protocols (e.g., NEXTHDR_HOP). But it is
909 * a start.
910 */
911 static bool ipv6_ndisc_frame(const struct sk_buff *skb)
912 {
913 const struct ipv6hdr *iph = ipv6_hdr(skb);
914 bool rc = false;
915
916 if (iph->nexthdr == NEXTHDR_ICMP) {
917 const struct icmp6hdr *icmph;
918 struct icmp6hdr _icmph;
919
920 icmph = skb_header_pointer(skb, sizeof(*iph),
921 sizeof(_icmph), &_icmph);
922 if (!icmph)
923 goto out;
924
925 switch (icmph->icmp6_type) {
926 case NDISC_ROUTER_SOLICITATION:
927 case NDISC_ROUTER_ADVERTISEMENT:
928 case NDISC_NEIGHBOUR_SOLICITATION:
929 case NDISC_NEIGHBOUR_ADVERTISEMENT:
930 case NDISC_REDIRECT:
931 rc = true;
932 break;
933 }
934 }
935
936 out:
937 return rc;
938 }
939
940 static struct rt6_info *vrf_ip6_route_lookup(struct net *net,
941 const struct net_device *dev,
942 struct flowi6 *fl6,
943 int ifindex,
944 int flags)
945 {
946 struct net_vrf *vrf = netdev_priv(dev);
947 struct fib6_table *table = NULL;
948 struct rt6_info *rt6;
949
950 rcu_read_lock();
951
952 /* fib6_table does not have a refcnt and can not be freed */
953 rt6 = rcu_dereference(vrf->rt6);
954 if (likely(rt6))
955 table = rt6->rt6i_table;
956
957 rcu_read_unlock();
958
959 if (!table)
960 return NULL;
961
962 return ip6_pol_route(net, table, ifindex, fl6, flags);
963 }
964
965 static void vrf_ip6_input_dst(struct sk_buff *skb, struct net_device *vrf_dev,
966 int ifindex)
967 {
968 const struct ipv6hdr *iph = ipv6_hdr(skb);
969 struct flowi6 fl6 = {
970 .flowi6_iif = ifindex,
971 .flowi6_mark = skb->mark,
972 .flowi6_proto = iph->nexthdr,
973 .daddr = iph->daddr,
974 .saddr = iph->saddr,
975 .flowlabel = ip6_flowinfo(iph),
976 };
977 struct net *net = dev_net(vrf_dev);
978 struct rt6_info *rt6;
979
980 rt6 = vrf_ip6_route_lookup(net, vrf_dev, &fl6, ifindex,
981 RT6_LOOKUP_F_HAS_SADDR | RT6_LOOKUP_F_IFACE);
982 if (unlikely(!rt6))
983 return;
984
985 if (unlikely(&rt6->dst == &net->ipv6.ip6_null_entry->dst))
986 return;
987
988 skb_dst_set(skb, &rt6->dst);
989 }
990
991 static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev,
992 struct sk_buff *skb)
993 {
994 int orig_iif = skb->skb_iif;
995 bool need_strict;
996
997 /* loopback traffic; do not push through packet taps again.
998 * Reset pkt_type for upper layers to process skb
999 */
1000 if (skb->pkt_type == PACKET_LOOPBACK) {
1001 skb->dev = vrf_dev;
1002 skb->skb_iif = vrf_dev->ifindex;
1003 IP6CB(skb)->flags |= IP6SKB_L3SLAVE;
1004 skb->pkt_type = PACKET_HOST;
1005 goto out;
1006 }
1007
1008 /* if packet is NDISC or addressed to multicast or link-local
1009 * then keep the ingress interface
1010 */
1011 need_strict = rt6_need_strict(&ipv6_hdr(skb)->daddr);
1012 if (!ipv6_ndisc_frame(skb) && !need_strict) {
1013 vrf_rx_stats(vrf_dev, skb->len);
1014 skb->dev = vrf_dev;
1015 skb->skb_iif = vrf_dev->ifindex;
1016
1017 if (!list_empty(&vrf_dev->ptype_all)) {
1018 skb_push(skb, skb->mac_len);
1019 dev_queue_xmit_nit(skb, vrf_dev);
1020 skb_pull(skb, skb->mac_len);
1021 }
1022
1023 IP6CB(skb)->flags |= IP6SKB_L3SLAVE;
1024 }
1025
1026 if (need_strict)
1027 vrf_ip6_input_dst(skb, vrf_dev, orig_iif);
1028
1029 skb = vrf_rcv_nfhook(NFPROTO_IPV6, NF_INET_PRE_ROUTING, skb, vrf_dev);
1030 out:
1031 return skb;
1032 }
1033
1034 #else
1035 static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev,
1036 struct sk_buff *skb)
1037 {
1038 return skb;
1039 }
1040 #endif
1041
1042 static struct sk_buff *vrf_ip_rcv(struct net_device *vrf_dev,
1043 struct sk_buff *skb)
1044 {
1045 skb->dev = vrf_dev;
1046 skb->skb_iif = vrf_dev->ifindex;
1047 IPCB(skb)->flags |= IPSKB_L3SLAVE;
1048
1049 if (ipv4_is_multicast(ip_hdr(skb)->daddr))
1050 goto out;
1051
1052 /* loopback traffic; do not push through packet taps again.
1053 * Reset pkt_type for upper layers to process skb
1054 */
1055 if (skb->pkt_type == PACKET_LOOPBACK) {
1056 skb->pkt_type = PACKET_HOST;
1057 goto out;
1058 }
1059
1060 vrf_rx_stats(vrf_dev, skb->len);
1061
1062 if (!list_empty(&vrf_dev->ptype_all)) {
1063 skb_push(skb, skb->mac_len);
1064 dev_queue_xmit_nit(skb, vrf_dev);
1065 skb_pull(skb, skb->mac_len);
1066 }
1067
1068 skb = vrf_rcv_nfhook(NFPROTO_IPV4, NF_INET_PRE_ROUTING, skb, vrf_dev);
1069 out:
1070 return skb;
1071 }
1072
1073 /* called with rcu lock held */
1074 static struct sk_buff *vrf_l3_rcv(struct net_device *vrf_dev,
1075 struct sk_buff *skb,
1076 u16 proto)
1077 {
1078 switch (proto) {
1079 case AF_INET:
1080 return vrf_ip_rcv(vrf_dev, skb);
1081 case AF_INET6:
1082 return vrf_ip6_rcv(vrf_dev, skb);
1083 }
1084
1085 return skb;
1086 }
1087
1088 #if IS_ENABLED(CONFIG_IPV6)
1089 /* send to link-local or multicast address via interface enslaved to
1090 * VRF device. Force lookup to VRF table without changing flow struct
1091 */
1092 static struct dst_entry *vrf_link_scope_lookup(const struct net_device *dev,
1093 struct flowi6 *fl6)
1094 {
1095 struct net *net = dev_net(dev);
1096 int flags = RT6_LOOKUP_F_IFACE;
1097 struct dst_entry *dst = NULL;
1098 struct rt6_info *rt;
1099
1100 /* VRF device does not have a link-local address and
1101 * sending packets to link-local or mcast addresses over
1102 * a VRF device does not make sense
1103 */
1104 if (fl6->flowi6_oif == dev->ifindex) {
1105 dst = &net->ipv6.ip6_null_entry->dst;
1106 dst_hold(dst);
1107 return dst;
1108 }
1109
1110 if (!ipv6_addr_any(&fl6->saddr))
1111 flags |= RT6_LOOKUP_F_HAS_SADDR;
1112
1113 rt = vrf_ip6_route_lookup(net, dev, fl6, fl6->flowi6_oif, flags);
1114 if (rt)
1115 dst = &rt->dst;
1116
1117 return dst;
1118 }
1119 #endif
1120
1121 static const struct l3mdev_ops vrf_l3mdev_ops = {
1122 .l3mdev_fib_table = vrf_fib_table,
1123 .l3mdev_l3_rcv = vrf_l3_rcv,
1124 .l3mdev_l3_out = vrf_l3_out,
1125 #if IS_ENABLED(CONFIG_IPV6)
1126 .l3mdev_link_scope_lookup = vrf_link_scope_lookup,
1127 #endif
1128 };
1129
1130 static void vrf_get_drvinfo(struct net_device *dev,
1131 struct ethtool_drvinfo *info)
1132 {
1133 strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
1134 strlcpy(info->version, DRV_VERSION, sizeof(info->version));
1135 }
1136
1137 static const struct ethtool_ops vrf_ethtool_ops = {
1138 .get_drvinfo = vrf_get_drvinfo,
1139 };
1140
1141 static inline size_t vrf_fib_rule_nl_size(void)
1142 {
1143 size_t sz;
1144
1145 sz = NLMSG_ALIGN(sizeof(struct fib_rule_hdr));
1146 sz += nla_total_size(sizeof(u8)); /* FRA_L3MDEV */
1147 sz += nla_total_size(sizeof(u32)); /* FRA_PRIORITY */
1148
1149 return sz;
1150 }
1151
1152 static int vrf_fib_rule(const struct net_device *dev, __u8 family, bool add_it)
1153 {
1154 struct fib_rule_hdr *frh;
1155 struct nlmsghdr *nlh;
1156 struct sk_buff *skb;
1157 int err;
1158
1159 if (family == AF_INET6 && !ipv6_mod_enabled())
1160 return 0;
1161
1162 skb = nlmsg_new(vrf_fib_rule_nl_size(), GFP_KERNEL);
1163 if (!skb)
1164 return -ENOMEM;
1165
1166 nlh = nlmsg_put(skb, 0, 0, 0, sizeof(*frh), 0);
1167 if (!nlh)
1168 goto nla_put_failure;
1169
1170 /* rule only needs to appear once */
1171 nlh->nlmsg_flags |= NLM_F_EXCL;
1172
1173 frh = nlmsg_data(nlh);
1174 memset(frh, 0, sizeof(*frh));
1175 frh->family = family;
1176 frh->action = FR_ACT_TO_TBL;
1177
1178 if (nla_put_u8(skb, FRA_L3MDEV, 1))
1179 goto nla_put_failure;
1180
1181 if (nla_put_u32(skb, FRA_PRIORITY, FIB_RULE_PREF))
1182 goto nla_put_failure;
1183
1184 nlmsg_end(skb, nlh);
1185
1186 /* fib_nl_{new,del}rule handling looks for net from skb->sk */
1187 skb->sk = dev_net(dev)->rtnl;
1188 if (add_it) {
1189 err = fib_nl_newrule(skb, nlh, NULL);
1190 if (err == -EEXIST)
1191 err = 0;
1192 } else {
1193 err = fib_nl_delrule(skb, nlh, NULL);
1194 if (err == -ENOENT)
1195 err = 0;
1196 }
1197 nlmsg_free(skb);
1198
1199 return err;
1200
1201 nla_put_failure:
1202 nlmsg_free(skb);
1203
1204 return -EMSGSIZE;
1205 }
1206
1207 static int vrf_add_fib_rules(const struct net_device *dev)
1208 {
1209 int err;
1210
1211 err = vrf_fib_rule(dev, AF_INET, true);
1212 if (err < 0)
1213 goto out_err;
1214
1215 err = vrf_fib_rule(dev, AF_INET6, true);
1216 if (err < 0)
1217 goto ipv6_err;
1218
1219 #if IS_ENABLED(CONFIG_IP_MROUTE_MULTIPLE_TABLES)
1220 err = vrf_fib_rule(dev, RTNL_FAMILY_IPMR, true);
1221 if (err < 0)
1222 goto ipmr_err;
1223 #endif
1224
1225 return 0;
1226
1227 #if IS_ENABLED(CONFIG_IP_MROUTE_MULTIPLE_TABLES)
1228 ipmr_err:
1229 vrf_fib_rule(dev, AF_INET6, false);
1230 #endif
1231
1232 ipv6_err:
1233 vrf_fib_rule(dev, AF_INET, false);
1234
1235 out_err:
1236 netdev_err(dev, "Failed to add FIB rules.\n");
1237 return err;
1238 }
1239
1240 static void vrf_setup(struct net_device *dev)
1241 {
1242 ether_setup(dev);
1243
1244 /* Initialize the device structure. */
1245 dev->netdev_ops = &vrf_netdev_ops;
1246 dev->l3mdev_ops = &vrf_l3mdev_ops;
1247 dev->ethtool_ops = &vrf_ethtool_ops;
1248 dev->needs_free_netdev = true;
1249
1250 /* Fill in device structure with ethernet-generic values. */
1251 eth_hw_addr_random(dev);
1252
1253 /* don't acquire vrf device's netif_tx_lock when transmitting */
1254 dev->features |= NETIF_F_LLTX;
1255
1256 /* don't allow vrf devices to change network namespaces. */
1257 dev->features |= NETIF_F_NETNS_LOCAL;
1258
1259 /* does not make sense for a VLAN to be added to a vrf device */
1260 dev->features |= NETIF_F_VLAN_CHALLENGED;
1261
1262 /* enable offload features */
1263 dev->features |= NETIF_F_GSO_SOFTWARE;
1264 dev->features |= NETIF_F_RXCSUM | NETIF_F_HW_CSUM;
1265 dev->features |= NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA;
1266
1267 dev->hw_features = dev->features;
1268 dev->hw_enc_features = dev->features;
1269
1270 /* default to no qdisc; user can add if desired */
1271 dev->priv_flags |= IFF_NO_QUEUE;
1272 }
1273
1274 static int vrf_validate(struct nlattr *tb[], struct nlattr *data[],
1275 struct netlink_ext_ack *extack)
1276 {
1277 if (tb[IFLA_ADDRESS]) {
1278 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
1279 NL_SET_ERR_MSG(extack, "Invalid hardware address");
1280 return -EINVAL;
1281 }
1282 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
1283 NL_SET_ERR_MSG(extack, "Invalid hardware address");
1284 return -EADDRNOTAVAIL;
1285 }
1286 }
1287 return 0;
1288 }
1289
1290 static void vrf_dellink(struct net_device *dev, struct list_head *head)
1291 {
1292 struct net_device *port_dev;
1293 struct list_head *iter;
1294
1295 netdev_for_each_lower_dev(dev, port_dev, iter)
1296 vrf_del_slave(dev, port_dev);
1297
1298 unregister_netdevice_queue(dev, head);
1299 }
1300
1301 static int vrf_newlink(struct net *src_net, struct net_device *dev,
1302 struct nlattr *tb[], struct nlattr *data[],
1303 struct netlink_ext_ack *extack)
1304 {
1305 struct net_vrf *vrf = netdev_priv(dev);
1306 bool *add_fib_rules;
1307 struct net *net;
1308 int err;
1309
1310 if (!data || !data[IFLA_VRF_TABLE]) {
1311 NL_SET_ERR_MSG(extack, "VRF table id is missing");
1312 return -EINVAL;
1313 }
1314
1315 vrf->tb_id = nla_get_u32(data[IFLA_VRF_TABLE]);
1316 if (vrf->tb_id == RT_TABLE_UNSPEC) {
1317 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VRF_TABLE],
1318 "Invalid VRF table id");
1319 return -EINVAL;
1320 }
1321
1322 dev->priv_flags |= IFF_L3MDEV_MASTER;
1323
1324 err = register_netdevice(dev);
1325 if (err)
1326 goto out;
1327
1328 net = dev_net(dev);
1329 add_fib_rules = net_generic(net, vrf_net_id);
1330 if (*add_fib_rules) {
1331 err = vrf_add_fib_rules(dev);
1332 if (err) {
1333 unregister_netdevice(dev);
1334 goto out;
1335 }
1336 *add_fib_rules = false;
1337 }
1338
1339 out:
1340 return err;
1341 }
1342
1343 static size_t vrf_nl_getsize(const struct net_device *dev)
1344 {
1345 return nla_total_size(sizeof(u32)); /* IFLA_VRF_TABLE */
1346 }
1347
1348 static int vrf_fillinfo(struct sk_buff *skb,
1349 const struct net_device *dev)
1350 {
1351 struct net_vrf *vrf = netdev_priv(dev);
1352
1353 return nla_put_u32(skb, IFLA_VRF_TABLE, vrf->tb_id);
1354 }
1355
1356 static size_t vrf_get_slave_size(const struct net_device *bond_dev,
1357 const struct net_device *slave_dev)
1358 {
1359 return nla_total_size(sizeof(u32)); /* IFLA_VRF_PORT_TABLE */
1360 }
1361
1362 static int vrf_fill_slave_info(struct sk_buff *skb,
1363 const struct net_device *vrf_dev,
1364 const struct net_device *slave_dev)
1365 {
1366 struct net_vrf *vrf = netdev_priv(vrf_dev);
1367
1368 if (nla_put_u32(skb, IFLA_VRF_PORT_TABLE, vrf->tb_id))
1369 return -EMSGSIZE;
1370
1371 return 0;
1372 }
1373
1374 static const struct nla_policy vrf_nl_policy[IFLA_VRF_MAX + 1] = {
1375 [IFLA_VRF_TABLE] = { .type = NLA_U32 },
1376 };
1377
1378 static struct rtnl_link_ops vrf_link_ops __read_mostly = {
1379 .kind = DRV_NAME,
1380 .priv_size = sizeof(struct net_vrf),
1381
1382 .get_size = vrf_nl_getsize,
1383 .policy = vrf_nl_policy,
1384 .validate = vrf_validate,
1385 .fill_info = vrf_fillinfo,
1386
1387 .get_slave_size = vrf_get_slave_size,
1388 .fill_slave_info = vrf_fill_slave_info,
1389
1390 .newlink = vrf_newlink,
1391 .dellink = vrf_dellink,
1392 .setup = vrf_setup,
1393 .maxtype = IFLA_VRF_MAX,
1394 };
1395
1396 static int vrf_device_event(struct notifier_block *unused,
1397 unsigned long event, void *ptr)
1398 {
1399 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1400
1401 /* only care about unregister events to drop slave references */
1402 if (event == NETDEV_UNREGISTER) {
1403 struct net_device *vrf_dev;
1404
1405 if (!netif_is_l3_slave(dev))
1406 goto out;
1407
1408 vrf_dev = netdev_master_upper_dev_get(dev);
1409 vrf_del_slave(vrf_dev, dev);
1410 }
1411 out:
1412 return NOTIFY_DONE;
1413 }
1414
1415 static struct notifier_block vrf_notifier_block __read_mostly = {
1416 .notifier_call = vrf_device_event,
1417 };
1418
1419 /* Initialize per network namespace state */
1420 static int __net_init vrf_netns_init(struct net *net)
1421 {
1422 bool *add_fib_rules = net_generic(net, vrf_net_id);
1423
1424 *add_fib_rules = true;
1425
1426 return 0;
1427 }
1428
1429 static struct pernet_operations vrf_net_ops __net_initdata = {
1430 .init = vrf_netns_init,
1431 .id = &vrf_net_id,
1432 .size = sizeof(bool),
1433 };
1434
1435 static int __init vrf_init_module(void)
1436 {
1437 int rc;
1438
1439 register_netdevice_notifier(&vrf_notifier_block);
1440
1441 rc = register_pernet_subsys(&vrf_net_ops);
1442 if (rc < 0)
1443 goto error;
1444
1445 rc = rtnl_link_register(&vrf_link_ops);
1446 if (rc < 0) {
1447 unregister_pernet_subsys(&vrf_net_ops);
1448 goto error;
1449 }
1450
1451 return 0;
1452
1453 error:
1454 unregister_netdevice_notifier(&vrf_notifier_block);
1455 return rc;
1456 }
1457
1458 module_init(vrf_init_module);
1459 MODULE_AUTHOR("Shrijeet Mukherjee, David Ahern");
1460 MODULE_DESCRIPTION("Device driver to instantiate VRF domains");
1461 MODULE_LICENSE("GPL");
1462 MODULE_ALIAS_RTNL_LINK(DRV_NAME);
1463 MODULE_VERSION(DRV_VERSION);
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