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12#include <linux/module.h>
13#include <linux/kernel.h>
14#include <linux/netdevice.h>
15#include <linux/etherdevice.h>
16#include <linux/ip.h>
17#include <linux/init.h>
18#include <linux/moduleparam.h>
19#include <linux/netfilter.h>
20#include <linux/rtnetlink.h>
21#include <net/rtnetlink.h>
22#include <linux/u64_stats_sync.h>
23#include <linux/hashtable.h>
24
25#include <linux/inetdevice.h>
26#include <net/arp.h>
27#include <net/ip.h>
28#include <net/ip_fib.h>
29#include <net/ip6_fib.h>
30#include <net/ip6_route.h>
31#include <net/route.h>
32#include <net/addrconf.h>
33#include <net/l3mdev.h>
34#include <net/fib_rules.h>
35#include <net/netns/generic.h>
36
37#define DRV_NAME "vrf"
38#define DRV_VERSION "1.0"
39
40#define FIB_RULE_PREF 1000
41
42static unsigned int vrf_net_id;
43
44struct net_vrf {
45 struct rtable __rcu *rth;
46 struct rt6_info __rcu *rt6;
47#if IS_ENABLED(CONFIG_IPV6)
48 struct fib6_table *fib6_table;
49#endif
50 u32 tb_id;
51};
52
53struct pcpu_dstats {
54 u64 tx_pkts;
55 u64 tx_bytes;
56 u64 tx_drps;
57 u64 rx_pkts;
58 u64 rx_bytes;
59 u64 rx_drps;
60 struct u64_stats_sync syncp;
61};
62
63static void vrf_rx_stats(struct net_device *dev, int len)
64{
65 struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats);
66
67 u64_stats_update_begin(&dstats->syncp);
68 dstats->rx_pkts++;
69 dstats->rx_bytes += len;
70 u64_stats_update_end(&dstats->syncp);
71}
72
73static void vrf_tx_error(struct net_device *vrf_dev, struct sk_buff *skb)
74{
75 vrf_dev->stats.tx_errors++;
76 kfree_skb(skb);
77}
78
79static void vrf_get_stats64(struct net_device *dev,
80 struct rtnl_link_stats64 *stats)
81{
82 int i;
83
84 for_each_possible_cpu(i) {
85 const struct pcpu_dstats *dstats;
86 u64 tbytes, tpkts, tdrops, rbytes, rpkts;
87 unsigned int start;
88
89 dstats = per_cpu_ptr(dev->dstats, i);
90 do {
91 start = u64_stats_fetch_begin_irq(&dstats->syncp);
92 tbytes = dstats->tx_bytes;
93 tpkts = dstats->tx_pkts;
94 tdrops = dstats->tx_drps;
95 rbytes = dstats->rx_bytes;
96 rpkts = dstats->rx_pkts;
97 } while (u64_stats_fetch_retry_irq(&dstats->syncp, start));
98 stats->tx_bytes += tbytes;
99 stats->tx_packets += tpkts;
100 stats->tx_dropped += tdrops;
101 stats->rx_bytes += rbytes;
102 stats->rx_packets += rpkts;
103 }
104}
105
106
107
108
109static bool qdisc_tx_is_default(const struct net_device *dev)
110{
111 struct netdev_queue *txq;
112 struct Qdisc *qdisc;
113
114 if (dev->num_tx_queues > 1)
115 return false;
116
117 txq = netdev_get_tx_queue(dev, 0);
118 qdisc = rcu_access_pointer(txq->qdisc);
119
120 return !qdisc->enqueue;
121}
122
123
124
125
126static int vrf_local_xmit(struct sk_buff *skb, struct net_device *dev,
127 struct dst_entry *dst)
128{
129 int len = skb->len;
130
131 skb_orphan(skb);
132
133 skb_dst_set(skb, dst);
134
135
136
137
138 skb->pkt_type = PACKET_LOOPBACK;
139
140 skb->protocol = eth_type_trans(skb, dev);
141
142 if (likely(netif_rx(skb) == NET_RX_SUCCESS))
143 vrf_rx_stats(dev, len);
144 else
145 this_cpu_inc(dev->dstats->rx_drps);
146
147 return NETDEV_TX_OK;
148}
149
150#if IS_ENABLED(CONFIG_IPV6)
151static int vrf_ip6_local_out(struct net *net, struct sock *sk,
152 struct sk_buff *skb)
153{
154 int err;
155
156 err = nf_hook(NFPROTO_IPV6, NF_INET_LOCAL_OUT, net,
157 sk, skb, NULL, skb_dst(skb)->dev, dst_output);
158
159 if (likely(err == 1))
160 err = dst_output(net, sk, skb);
161
162 return err;
163}
164
165static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb,
166 struct net_device *dev)
167{
168 const struct ipv6hdr *iph;
169 struct net *net = dev_net(skb->dev);
170 struct flowi6 fl6;
171 int ret = NET_XMIT_DROP;
172 struct dst_entry *dst;
173 struct dst_entry *dst_null = &net->ipv6.ip6_null_entry->dst;
174
175 if (!pskb_may_pull(skb, ETH_HLEN + sizeof(struct ipv6hdr)))
176 goto err;
177
178 iph = ipv6_hdr(skb);
179
180 memset(&fl6, 0, sizeof(fl6));
181
182 fl6.flowi6_oif = dev->ifindex;
183 fl6.flowi6_iif = LOOPBACK_IFINDEX;
184 fl6.daddr = iph->daddr;
185 fl6.saddr = iph->saddr;
186 fl6.flowlabel = ip6_flowinfo(iph);
187 fl6.flowi6_mark = skb->mark;
188 fl6.flowi6_proto = iph->nexthdr;
189 fl6.flowi6_flags = FLOWI_FLAG_SKIP_NH_OIF;
190
191 dst = ip6_dst_lookup_flow(net, NULL, &fl6, NULL);
192 if (IS_ERR(dst) || dst == dst_null)
193 goto err;
194
195 skb_dst_drop(skb);
196
197
198
199
200
201 if (dst->dev == dev)
202 return vrf_local_xmit(skb, dev, dst);
203
204 skb_dst_set(skb, dst);
205
206
207 __skb_pull(skb, skb_network_offset(skb));
208
209 ret = vrf_ip6_local_out(net, skb->sk, skb);
210 if (unlikely(net_xmit_eval(ret)))
211 dev->stats.tx_errors++;
212 else
213 ret = NET_XMIT_SUCCESS;
214
215 return ret;
216err:
217 vrf_tx_error(dev, skb);
218 return NET_XMIT_DROP;
219}
220#else
221static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb,
222 struct net_device *dev)
223{
224 vrf_tx_error(dev, skb);
225 return NET_XMIT_DROP;
226}
227#endif
228
229
230static int vrf_ip_local_out(struct net *net, struct sock *sk,
231 struct sk_buff *skb)
232{
233 int err;
234
235 err = nf_hook(NFPROTO_IPV4, NF_INET_LOCAL_OUT, net, sk,
236 skb, NULL, skb_dst(skb)->dev, dst_output);
237 if (likely(err == 1))
238 err = dst_output(net, sk, skb);
239
240 return err;
241}
242
243static netdev_tx_t vrf_process_v4_outbound(struct sk_buff *skb,
244 struct net_device *vrf_dev)
245{
246 struct iphdr *ip4h;
247 int ret = NET_XMIT_DROP;
248 struct flowi4 fl4;
249 struct net *net = dev_net(vrf_dev);
250 struct rtable *rt;
251
252 if (!pskb_may_pull(skb, ETH_HLEN + sizeof(struct iphdr)))
253 goto err;
254
255 ip4h = ip_hdr(skb);
256
257 memset(&fl4, 0, sizeof(fl4));
258
259 fl4.flowi4_oif = vrf_dev->ifindex;
260 fl4.flowi4_iif = LOOPBACK_IFINDEX;
261 fl4.flowi4_tos = RT_TOS(ip4h->tos);
262 fl4.flowi4_flags = FLOWI_FLAG_ANYSRC | FLOWI_FLAG_SKIP_NH_OIF;
263 fl4.flowi4_proto = ip4h->protocol;
264 fl4.daddr = ip4h->daddr;
265 fl4.saddr = ip4h->saddr;
266
267 rt = ip_route_output_flow(net, &fl4, NULL);
268 if (IS_ERR(rt))
269 goto err;
270
271 skb_dst_drop(skb);
272
273
274
275
276
277 if (rt->dst.dev == vrf_dev)
278 return vrf_local_xmit(skb, vrf_dev, &rt->dst);
279
280 skb_dst_set(skb, &rt->dst);
281
282
283 __skb_pull(skb, skb_network_offset(skb));
284
285 if (!ip4h->saddr) {
286 ip4h->saddr = inet_select_addr(skb_dst(skb)->dev, 0,
287 RT_SCOPE_LINK);
288 }
289
290 ret = vrf_ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb);
291 if (unlikely(net_xmit_eval(ret)))
292 vrf_dev->stats.tx_errors++;
293 else
294 ret = NET_XMIT_SUCCESS;
295
296out:
297 return ret;
298err:
299 vrf_tx_error(vrf_dev, skb);
300 goto out;
301}
302
303static netdev_tx_t is_ip_tx_frame(struct sk_buff *skb, struct net_device *dev)
304{
305 switch (skb->protocol) {
306 case htons(ETH_P_IP):
307 return vrf_process_v4_outbound(skb, dev);
308 case htons(ETH_P_IPV6):
309 return vrf_process_v6_outbound(skb, dev);
310 default:
311 vrf_tx_error(dev, skb);
312 return NET_XMIT_DROP;
313 }
314}
315
316static netdev_tx_t vrf_xmit(struct sk_buff *skb, struct net_device *dev)
317{
318 int len = skb->len;
319 netdev_tx_t ret = is_ip_tx_frame(skb, dev);
320
321 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
322 struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats);
323
324 u64_stats_update_begin(&dstats->syncp);
325 dstats->tx_pkts++;
326 dstats->tx_bytes += len;
327 u64_stats_update_end(&dstats->syncp);
328 } else {
329 this_cpu_inc(dev->dstats->tx_drps);
330 }
331
332 return ret;
333}
334
335static int vrf_finish_direct(struct net *net, struct sock *sk,
336 struct sk_buff *skb)
337{
338 struct net_device *vrf_dev = skb->dev;
339
340 if (!list_empty(&vrf_dev->ptype_all) &&
341 likely(skb_headroom(skb) >= ETH_HLEN)) {
342 struct ethhdr *eth = skb_push(skb, ETH_HLEN);
343
344 ether_addr_copy(eth->h_source, vrf_dev->dev_addr);
345 eth_zero_addr(eth->h_dest);
346 eth->h_proto = skb->protocol;
347
348 rcu_read_lock_bh();
349 dev_queue_xmit_nit(skb, vrf_dev);
350 rcu_read_unlock_bh();
351
352 skb_pull(skb, ETH_HLEN);
353 }
354
355 return 1;
356}
357
358#if IS_ENABLED(CONFIG_IPV6)
359
360static int vrf_finish_output6(struct net *net, struct sock *sk,
361 struct sk_buff *skb)
362{
363 struct dst_entry *dst = skb_dst(skb);
364 struct net_device *dev = dst->dev;
365 const struct in6_addr *nexthop;
366 struct neighbour *neigh;
367 int ret;
368
369 nf_reset_ct(skb);
370
371 skb->protocol = htons(ETH_P_IPV6);
372 skb->dev = dev;
373
374 rcu_read_lock_bh();
375 nexthop = rt6_nexthop((struct rt6_info *)dst, &ipv6_hdr(skb)->daddr);
376 neigh = __ipv6_neigh_lookup_noref(dst->dev, nexthop);
377 if (unlikely(!neigh))
378 neigh = __neigh_create(&nd_tbl, nexthop, dst->dev, false);
379 if (!IS_ERR(neigh)) {
380 sock_confirm_neigh(skb, neigh);
381 ret = neigh_output(neigh, skb, false);
382 rcu_read_unlock_bh();
383 return ret;
384 }
385 rcu_read_unlock_bh();
386
387 IP6_INC_STATS(dev_net(dst->dev),
388 ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES);
389 kfree_skb(skb);
390 return -EINVAL;
391}
392
393
394static int vrf_output6(struct net *net, struct sock *sk, struct sk_buff *skb)
395{
396 return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING,
397 net, sk, skb, NULL, skb_dst(skb)->dev,
398 vrf_finish_output6,
399 !(IP6CB(skb)->flags & IP6SKB_REROUTED));
400}
401
402
403
404
405
406static struct sk_buff *vrf_ip6_out_redirect(struct net_device *vrf_dev,
407 struct sk_buff *skb)
408{
409 struct net_vrf *vrf = netdev_priv(vrf_dev);
410 struct dst_entry *dst = NULL;
411 struct rt6_info *rt6;
412
413 rcu_read_lock();
414
415 rt6 = rcu_dereference(vrf->rt6);
416 if (likely(rt6)) {
417 dst = &rt6->dst;
418 dst_hold(dst);
419 }
420
421 rcu_read_unlock();
422
423 if (unlikely(!dst)) {
424 vrf_tx_error(vrf_dev, skb);
425 return NULL;
426 }
427
428 skb_dst_drop(skb);
429 skb_dst_set(skb, dst);
430
431 return skb;
432}
433
434static int vrf_output6_direct(struct net *net, struct sock *sk,
435 struct sk_buff *skb)
436{
437 skb->protocol = htons(ETH_P_IPV6);
438
439 return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING,
440 net, sk, skb, NULL, skb->dev,
441 vrf_finish_direct,
442 !(IPCB(skb)->flags & IPSKB_REROUTED));
443}
444
445static struct sk_buff *vrf_ip6_out_direct(struct net_device *vrf_dev,
446 struct sock *sk,
447 struct sk_buff *skb)
448{
449 struct net *net = dev_net(vrf_dev);
450 int err;
451
452 skb->dev = vrf_dev;
453
454 err = nf_hook(NFPROTO_IPV6, NF_INET_LOCAL_OUT, net, sk,
455 skb, NULL, vrf_dev, vrf_output6_direct);
456
457 if (likely(err == 1))
458 err = vrf_output6_direct(net, sk, skb);
459
460
461 if (likely(err == 1))
462 nf_reset_ct(skb);
463 else
464 skb = NULL;
465
466 return skb;
467}
468
469static struct sk_buff *vrf_ip6_out(struct net_device *vrf_dev,
470 struct sock *sk,
471 struct sk_buff *skb)
472{
473
474 if (rt6_need_strict(&ipv6_hdr(skb)->daddr))
475 return skb;
476
477 if (qdisc_tx_is_default(vrf_dev) ||
478 IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED)
479 return vrf_ip6_out_direct(vrf_dev, sk, skb);
480
481 return vrf_ip6_out_redirect(vrf_dev, skb);
482}
483
484
485static void vrf_rt6_release(struct net_device *dev, struct net_vrf *vrf)
486{
487 struct rt6_info *rt6 = rtnl_dereference(vrf->rt6);
488 struct net *net = dev_net(dev);
489 struct dst_entry *dst;
490
491 RCU_INIT_POINTER(vrf->rt6, NULL);
492 synchronize_rcu();
493
494
495
496
497 if (rt6) {
498 dst = &rt6->dst;
499 dev_put(dst->dev);
500 dst->dev = net->loopback_dev;
501 dev_hold(dst->dev);
502 dst_release(dst);
503 }
504}
505
506static int vrf_rt6_create(struct net_device *dev)
507{
508 int flags = DST_NOPOLICY | DST_NOXFRM;
509 struct net_vrf *vrf = netdev_priv(dev);
510 struct net *net = dev_net(dev);
511 struct rt6_info *rt6;
512 int rc = -ENOMEM;
513
514
515 if (!ipv6_mod_enabled())
516 return 0;
517
518 vrf->fib6_table = fib6_new_table(net, vrf->tb_id);
519 if (!vrf->fib6_table)
520 goto out;
521
522
523 rt6 = ip6_dst_alloc(net, dev, flags);
524 if (!rt6)
525 goto out;
526
527 rt6->dst.output = vrf_output6;
528
529 rcu_assign_pointer(vrf->rt6, rt6);
530
531 rc = 0;
532out:
533 return rc;
534}
535#else
536static struct sk_buff *vrf_ip6_out(struct net_device *vrf_dev,
537 struct sock *sk,
538 struct sk_buff *skb)
539{
540 return skb;
541}
542
543static void vrf_rt6_release(struct net_device *dev, struct net_vrf *vrf)
544{
545}
546
547static int vrf_rt6_create(struct net_device *dev)
548{
549 return 0;
550}
551#endif
552
553
554static int vrf_finish_output(struct net *net, struct sock *sk, struct sk_buff *skb)
555{
556 struct dst_entry *dst = skb_dst(skb);
557 struct rtable *rt = (struct rtable *)dst;
558 struct net_device *dev = dst->dev;
559 unsigned int hh_len = LL_RESERVED_SPACE(dev);
560 struct neighbour *neigh;
561 bool is_v6gw = false;
562 int ret = -EINVAL;
563
564 nf_reset_ct(skb);
565
566
567 if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) {
568 struct sk_buff *skb2;
569
570 skb2 = skb_realloc_headroom(skb, LL_RESERVED_SPACE(dev));
571 if (!skb2) {
572 ret = -ENOMEM;
573 goto err;
574 }
575 if (skb->sk)
576 skb_set_owner_w(skb2, skb->sk);
577
578 consume_skb(skb);
579 skb = skb2;
580 }
581
582 rcu_read_lock_bh();
583
584 neigh = ip_neigh_for_gw(rt, skb, &is_v6gw);
585 if (!IS_ERR(neigh)) {
586 sock_confirm_neigh(skb, neigh);
587
588 ret = neigh_output(neigh, skb, is_v6gw);
589 rcu_read_unlock_bh();
590 return ret;
591 }
592
593 rcu_read_unlock_bh();
594err:
595 vrf_tx_error(skb->dev, skb);
596 return ret;
597}
598
599static int vrf_output(struct net *net, struct sock *sk, struct sk_buff *skb)
600{
601 struct net_device *dev = skb_dst(skb)->dev;
602
603 IP_UPD_PO_STATS(net, IPSTATS_MIB_OUT, skb->len);
604
605 skb->dev = dev;
606 skb->protocol = htons(ETH_P_IP);
607
608 return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING,
609 net, sk, skb, NULL, dev,
610 vrf_finish_output,
611 !(IPCB(skb)->flags & IPSKB_REROUTED));
612}
613
614
615
616
617
618static struct sk_buff *vrf_ip_out_redirect(struct net_device *vrf_dev,
619 struct sk_buff *skb)
620{
621 struct net_vrf *vrf = netdev_priv(vrf_dev);
622 struct dst_entry *dst = NULL;
623 struct rtable *rth;
624
625 rcu_read_lock();
626
627 rth = rcu_dereference(vrf->rth);
628 if (likely(rth)) {
629 dst = &rth->dst;
630 dst_hold(dst);
631 }
632
633 rcu_read_unlock();
634
635 if (unlikely(!dst)) {
636 vrf_tx_error(vrf_dev, skb);
637 return NULL;
638 }
639
640 skb_dst_drop(skb);
641 skb_dst_set(skb, dst);
642
643 return skb;
644}
645
646static int vrf_output_direct(struct net *net, struct sock *sk,
647 struct sk_buff *skb)
648{
649 skb->protocol = htons(ETH_P_IP);
650
651 return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING,
652 net, sk, skb, NULL, skb->dev,
653 vrf_finish_direct,
654 !(IPCB(skb)->flags & IPSKB_REROUTED));
655}
656
657static struct sk_buff *vrf_ip_out_direct(struct net_device *vrf_dev,
658 struct sock *sk,
659 struct sk_buff *skb)
660{
661 struct net *net = dev_net(vrf_dev);
662 int err;
663
664 skb->dev = vrf_dev;
665
666 err = nf_hook(NFPROTO_IPV4, NF_INET_LOCAL_OUT, net, sk,
667 skb, NULL, vrf_dev, vrf_output_direct);
668
669 if (likely(err == 1))
670 err = vrf_output_direct(net, sk, skb);
671
672
673 if (likely(err == 1))
674 nf_reset_ct(skb);
675 else
676 skb = NULL;
677
678 return skb;
679}
680
681static struct sk_buff *vrf_ip_out(struct net_device *vrf_dev,
682 struct sock *sk,
683 struct sk_buff *skb)
684{
685
686 if (ipv4_is_multicast(ip_hdr(skb)->daddr) ||
687 ipv4_is_lbcast(ip_hdr(skb)->daddr))
688 return skb;
689
690 if (qdisc_tx_is_default(vrf_dev) ||
691 IPCB(skb)->flags & IPSKB_XFRM_TRANSFORMED)
692 return vrf_ip_out_direct(vrf_dev, sk, skb);
693
694 return vrf_ip_out_redirect(vrf_dev, skb);
695}
696
697
698static struct sk_buff *vrf_l3_out(struct net_device *vrf_dev,
699 struct sock *sk,
700 struct sk_buff *skb,
701 u16 proto)
702{
703 switch (proto) {
704 case AF_INET:
705 return vrf_ip_out(vrf_dev, sk, skb);
706 case AF_INET6:
707 return vrf_ip6_out(vrf_dev, sk, skb);
708 }
709
710 return skb;
711}
712
713
714static void vrf_rtable_release(struct net_device *dev, struct net_vrf *vrf)
715{
716 struct rtable *rth = rtnl_dereference(vrf->rth);
717 struct net *net = dev_net(dev);
718 struct dst_entry *dst;
719
720 RCU_INIT_POINTER(vrf->rth, NULL);
721 synchronize_rcu();
722
723
724
725
726 if (rth) {
727 dst = &rth->dst;
728 dev_put(dst->dev);
729 dst->dev = net->loopback_dev;
730 dev_hold(dst->dev);
731 dst_release(dst);
732 }
733}
734
735static int vrf_rtable_create(struct net_device *dev)
736{
737 struct net_vrf *vrf = netdev_priv(dev);
738 struct rtable *rth;
739
740 if (!fib_new_table(dev_net(dev), vrf->tb_id))
741 return -ENOMEM;
742
743
744 rth = rt_dst_alloc(dev, 0, RTN_UNICAST, 1, 1);
745 if (!rth)
746 return -ENOMEM;
747
748 rth->dst.output = vrf_output;
749
750 rcu_assign_pointer(vrf->rth, rth);
751
752 return 0;
753}
754
755
756
757
758static void cycle_netdev(struct net_device *dev,
759 struct netlink_ext_ack *extack)
760{
761 unsigned int flags = dev->flags;
762 int ret;
763
764 if (!netif_running(dev))
765 return;
766
767 ret = dev_change_flags(dev, flags & ~IFF_UP, extack);
768 if (ret >= 0)
769 ret = dev_change_flags(dev, flags, extack);
770
771 if (ret < 0) {
772 netdev_err(dev,
773 "Failed to cycle device %s; route tables might be wrong!\n",
774 dev->name);
775 }
776}
777
778static int do_vrf_add_slave(struct net_device *dev, struct net_device *port_dev,
779 struct netlink_ext_ack *extack)
780{
781 int ret;
782
783
784
785
786 if (port_dev == dev_net(dev)->loopback_dev) {
787 NL_SET_ERR_MSG(extack,
788 "Can not enslave loopback device to a VRF");
789 return -EOPNOTSUPP;
790 }
791
792 port_dev->priv_flags |= IFF_L3MDEV_SLAVE;
793 ret = netdev_master_upper_dev_link(port_dev, dev, NULL, NULL, extack);
794 if (ret < 0)
795 goto err;
796
797 cycle_netdev(port_dev, extack);
798
799 return 0;
800
801err:
802 port_dev->priv_flags &= ~IFF_L3MDEV_SLAVE;
803 return ret;
804}
805
806static int vrf_add_slave(struct net_device *dev, struct net_device *port_dev,
807 struct netlink_ext_ack *extack)
808{
809 if (netif_is_l3_master(port_dev)) {
810 NL_SET_ERR_MSG(extack,
811 "Can not enslave an L3 master device to a VRF");
812 return -EINVAL;
813 }
814
815 if (netif_is_l3_slave(port_dev))
816 return -EINVAL;
817
818 return do_vrf_add_slave(dev, port_dev, extack);
819}
820
821
822static int do_vrf_del_slave(struct net_device *dev, struct net_device *port_dev)
823{
824 netdev_upper_dev_unlink(port_dev, dev);
825 port_dev->priv_flags &= ~IFF_L3MDEV_SLAVE;
826
827 cycle_netdev(port_dev, NULL);
828
829 return 0;
830}
831
832static int vrf_del_slave(struct net_device *dev, struct net_device *port_dev)
833{
834 return do_vrf_del_slave(dev, port_dev);
835}
836
837static void vrf_dev_uninit(struct net_device *dev)
838{
839 struct net_vrf *vrf = netdev_priv(dev);
840
841 vrf_rtable_release(dev, vrf);
842 vrf_rt6_release(dev, vrf);
843
844 free_percpu(dev->dstats);
845 dev->dstats = NULL;
846}
847
848static int vrf_dev_init(struct net_device *dev)
849{
850 struct net_vrf *vrf = netdev_priv(dev);
851
852 dev->dstats = netdev_alloc_pcpu_stats(struct pcpu_dstats);
853 if (!dev->dstats)
854 goto out_nomem;
855
856
857 if (vrf_rtable_create(dev) != 0)
858 goto out_stats;
859
860 if (vrf_rt6_create(dev) != 0)
861 goto out_rth;
862
863 dev->flags = IFF_MASTER | IFF_NOARP;
864
865
866 dev->mtu = 64 * 1024;
867
868
869 dev->operstate = IF_OPER_UP;
870 return 0;
871
872out_rth:
873 vrf_rtable_release(dev, vrf);
874out_stats:
875 free_percpu(dev->dstats);
876 dev->dstats = NULL;
877out_nomem:
878 return -ENOMEM;
879}
880
881static const struct net_device_ops vrf_netdev_ops = {
882 .ndo_init = vrf_dev_init,
883 .ndo_uninit = vrf_dev_uninit,
884 .ndo_start_xmit = vrf_xmit,
885 .ndo_set_mac_address = eth_mac_addr,
886 .ndo_get_stats64 = vrf_get_stats64,
887 .ndo_add_slave = vrf_add_slave,
888 .ndo_del_slave = vrf_del_slave,
889};
890
891static u32 vrf_fib_table(const struct net_device *dev)
892{
893 struct net_vrf *vrf = netdev_priv(dev);
894
895 return vrf->tb_id;
896}
897
898static int vrf_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb)
899{
900 kfree_skb(skb);
901 return 0;
902}
903
904static struct sk_buff *vrf_rcv_nfhook(u8 pf, unsigned int hook,
905 struct sk_buff *skb,
906 struct net_device *dev)
907{
908 struct net *net = dev_net(dev);
909
910 if (nf_hook(pf, hook, net, NULL, skb, dev, NULL, vrf_rcv_finish) != 1)
911 skb = NULL;
912
913 return skb;
914}
915
916#if IS_ENABLED(CONFIG_IPV6)
917
918
919
920
921
922static bool ipv6_ndisc_frame(const struct sk_buff *skb)
923{
924 const struct ipv6hdr *iph = ipv6_hdr(skb);
925 bool rc = false;
926
927 if (iph->nexthdr == NEXTHDR_ICMP) {
928 const struct icmp6hdr *icmph;
929 struct icmp6hdr _icmph;
930
931 icmph = skb_header_pointer(skb, sizeof(*iph),
932 sizeof(_icmph), &_icmph);
933 if (!icmph)
934 goto out;
935
936 switch (icmph->icmp6_type) {
937 case NDISC_ROUTER_SOLICITATION:
938 case NDISC_ROUTER_ADVERTISEMENT:
939 case NDISC_NEIGHBOUR_SOLICITATION:
940 case NDISC_NEIGHBOUR_ADVERTISEMENT:
941 case NDISC_REDIRECT:
942 rc = true;
943 break;
944 }
945 }
946
947out:
948 return rc;
949}
950
951static struct rt6_info *vrf_ip6_route_lookup(struct net *net,
952 const struct net_device *dev,
953 struct flowi6 *fl6,
954 int ifindex,
955 const struct sk_buff *skb,
956 int flags)
957{
958 struct net_vrf *vrf = netdev_priv(dev);
959
960 return ip6_pol_route(net, vrf->fib6_table, ifindex, fl6, skb, flags);
961}
962
963static void vrf_ip6_input_dst(struct sk_buff *skb, struct net_device *vrf_dev,
964 int ifindex)
965{
966 const struct ipv6hdr *iph = ipv6_hdr(skb);
967 struct flowi6 fl6 = {
968 .flowi6_iif = ifindex,
969 .flowi6_mark = skb->mark,
970 .flowi6_proto = iph->nexthdr,
971 .daddr = iph->daddr,
972 .saddr = iph->saddr,
973 .flowlabel = ip6_flowinfo(iph),
974 };
975 struct net *net = dev_net(vrf_dev);
976 struct rt6_info *rt6;
977
978 rt6 = vrf_ip6_route_lookup(net, vrf_dev, &fl6, ifindex, skb,
979 RT6_LOOKUP_F_HAS_SADDR | RT6_LOOKUP_F_IFACE);
980 if (unlikely(!rt6))
981 return;
982
983 if (unlikely(&rt6->dst == &net->ipv6.ip6_null_entry->dst))
984 return;
985
986 skb_dst_set(skb, &rt6->dst);
987}
988
989static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev,
990 struct sk_buff *skb)
991{
992 int orig_iif = skb->skb_iif;
993 bool need_strict = rt6_need_strict(&ipv6_hdr(skb)->daddr);
994 bool is_ndisc = ipv6_ndisc_frame(skb);
995
996
997
998
999 if (skb->pkt_type == PACKET_LOOPBACK || (need_strict && !is_ndisc)) {
1000 skb->dev = vrf_dev;
1001 skb->skb_iif = vrf_dev->ifindex;
1002 IP6CB(skb)->flags |= IP6SKB_L3SLAVE;
1003 if (skb->pkt_type == PACKET_LOOPBACK)
1004 skb->pkt_type = PACKET_HOST;
1005 goto out;
1006 }
1007
1008
1009 if (!is_ndisc) {
1010 vrf_rx_stats(vrf_dev, skb->len);
1011 skb->dev = vrf_dev;
1012 skb->skb_iif = vrf_dev->ifindex;
1013
1014 if (!list_empty(&vrf_dev->ptype_all)) {
1015 skb_push(skb, skb->mac_len);
1016 dev_queue_xmit_nit(skb, vrf_dev);
1017 skb_pull(skb, skb->mac_len);
1018 }
1019
1020 IP6CB(skb)->flags |= IP6SKB_L3SLAVE;
1021 }
1022
1023 if (need_strict)
1024 vrf_ip6_input_dst(skb, vrf_dev, orig_iif);
1025
1026 skb = vrf_rcv_nfhook(NFPROTO_IPV6, NF_INET_PRE_ROUTING, skb, vrf_dev);
1027out:
1028 return skb;
1029}
1030
1031#else
1032static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev,
1033 struct sk_buff *skb)
1034{
1035 return skb;
1036}
1037#endif
1038
1039static struct sk_buff *vrf_ip_rcv(struct net_device *vrf_dev,
1040 struct sk_buff *skb)
1041{
1042 skb->dev = vrf_dev;
1043 skb->skb_iif = vrf_dev->ifindex;
1044 IPCB(skb)->flags |= IPSKB_L3SLAVE;
1045
1046 if (ipv4_is_multicast(ip_hdr(skb)->daddr))
1047 goto out;
1048
1049
1050
1051
1052 if (skb->pkt_type == PACKET_LOOPBACK) {
1053 skb->pkt_type = PACKET_HOST;
1054 goto out;
1055 }
1056
1057 vrf_rx_stats(vrf_dev, skb->len);
1058
1059 if (!list_empty(&vrf_dev->ptype_all)) {
1060 skb_push(skb, skb->mac_len);
1061 dev_queue_xmit_nit(skb, vrf_dev);
1062 skb_pull(skb, skb->mac_len);
1063 }
1064
1065 skb = vrf_rcv_nfhook(NFPROTO_IPV4, NF_INET_PRE_ROUTING, skb, vrf_dev);
1066out:
1067 return skb;
1068}
1069
1070
1071static struct sk_buff *vrf_l3_rcv(struct net_device *vrf_dev,
1072 struct sk_buff *skb,
1073 u16 proto)
1074{
1075 switch (proto) {
1076 case AF_INET:
1077 return vrf_ip_rcv(vrf_dev, skb);
1078 case AF_INET6:
1079 return vrf_ip6_rcv(vrf_dev, skb);
1080 }
1081
1082 return skb;
1083}
1084
1085#if IS_ENABLED(CONFIG_IPV6)
1086
1087
1088
1089
1090
1091static struct dst_entry *vrf_link_scope_lookup(const struct net_device *dev,
1092 struct flowi6 *fl6)
1093{
1094 struct net *net = dev_net(dev);
1095 int flags = RT6_LOOKUP_F_IFACE | RT6_LOOKUP_F_DST_NOREF;
1096 struct dst_entry *dst = NULL;
1097 struct rt6_info *rt;
1098
1099
1100
1101
1102
1103 if (fl6->flowi6_oif == dev->ifindex) {
1104 dst = &net->ipv6.ip6_null_entry->dst;
1105 return dst;
1106 }
1107
1108 if (!ipv6_addr_any(&fl6->saddr))
1109 flags |= RT6_LOOKUP_F_HAS_SADDR;
1110
1111 rt = vrf_ip6_route_lookup(net, dev, fl6, fl6->flowi6_oif, NULL, flags);
1112 if (rt)
1113 dst = &rt->dst;
1114
1115 return dst;
1116}
1117#endif
1118
1119static const struct l3mdev_ops vrf_l3mdev_ops = {
1120 .l3mdev_fib_table = vrf_fib_table,
1121 .l3mdev_l3_rcv = vrf_l3_rcv,
1122 .l3mdev_l3_out = vrf_l3_out,
1123#if IS_ENABLED(CONFIG_IPV6)
1124 .l3mdev_link_scope_lookup = vrf_link_scope_lookup,
1125#endif
1126};
1127
1128static void vrf_get_drvinfo(struct net_device *dev,
1129 struct ethtool_drvinfo *info)
1130{
1131 strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
1132 strlcpy(info->version, DRV_VERSION, sizeof(info->version));
1133}
1134
1135static const struct ethtool_ops vrf_ethtool_ops = {
1136 .get_drvinfo = vrf_get_drvinfo,
1137};
1138
1139static inline size_t vrf_fib_rule_nl_size(void)
1140{
1141 size_t sz;
1142
1143 sz = NLMSG_ALIGN(sizeof(struct fib_rule_hdr));
1144 sz += nla_total_size(sizeof(u8));
1145 sz += nla_total_size(sizeof(u32));
1146 sz += nla_total_size(sizeof(u8));
1147
1148 return sz;
1149}
1150
1151static int vrf_fib_rule(const struct net_device *dev, __u8 family, bool add_it)
1152{
1153 struct fib_rule_hdr *frh;
1154 struct nlmsghdr *nlh;
1155 struct sk_buff *skb;
1156 int err;
1157
1158 if ((family == AF_INET6 || family == RTNL_FAMILY_IP6MR) &&
1159 !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
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_PROTOCOL, RTPROT_KERNEL))
1179 goto nla_put_failure;
1180
1181 if (nla_put_u8(skb, FRA_L3MDEV, 1))
1182 goto nla_put_failure;
1183
1184 if (nla_put_u32(skb, FRA_PRIORITY, FIB_RULE_PREF))
1185 goto nla_put_failure;
1186
1187 nlmsg_end(skb, nlh);
1188
1189
1190 skb->sk = dev_net(dev)->rtnl;
1191 if (add_it) {
1192 err = fib_nl_newrule(skb, nlh, NULL);
1193 if (err == -EEXIST)
1194 err = 0;
1195 } else {
1196 err = fib_nl_delrule(skb, nlh, NULL);
1197 if (err == -ENOENT)
1198 err = 0;
1199 }
1200 nlmsg_free(skb);
1201
1202 return err;
1203
1204nla_put_failure:
1205 nlmsg_free(skb);
1206
1207 return -EMSGSIZE;
1208}
1209
1210static int vrf_add_fib_rules(const struct net_device *dev)
1211{
1212 int err;
1213
1214 err = vrf_fib_rule(dev, AF_INET, true);
1215 if (err < 0)
1216 goto out_err;
1217
1218 err = vrf_fib_rule(dev, AF_INET6, true);
1219 if (err < 0)
1220 goto ipv6_err;
1221
1222#if IS_ENABLED(CONFIG_IP_MROUTE_MULTIPLE_TABLES)
1223 err = vrf_fib_rule(dev, RTNL_FAMILY_IPMR, true);
1224 if (err < 0)
1225 goto ipmr_err;
1226#endif
1227
1228#if IS_ENABLED(CONFIG_IPV6_MROUTE_MULTIPLE_TABLES)
1229 err = vrf_fib_rule(dev, RTNL_FAMILY_IP6MR, true);
1230 if (err < 0)
1231 goto ip6mr_err;
1232#endif
1233
1234 return 0;
1235
1236#if IS_ENABLED(CONFIG_IPV6_MROUTE_MULTIPLE_TABLES)
1237ip6mr_err:
1238 vrf_fib_rule(dev, RTNL_FAMILY_IPMR, false);
1239#endif
1240
1241#if IS_ENABLED(CONFIG_IP_MROUTE_MULTIPLE_TABLES)
1242ipmr_err:
1243 vrf_fib_rule(dev, AF_INET6, false);
1244#endif
1245
1246ipv6_err:
1247 vrf_fib_rule(dev, AF_INET, false);
1248
1249out_err:
1250 netdev_err(dev, "Failed to add FIB rules.\n");
1251 return err;
1252}
1253
1254static void vrf_setup(struct net_device *dev)
1255{
1256 ether_setup(dev);
1257
1258
1259 dev->netdev_ops = &vrf_netdev_ops;
1260 dev->l3mdev_ops = &vrf_l3mdev_ops;
1261 dev->ethtool_ops = &vrf_ethtool_ops;
1262 dev->needs_free_netdev = true;
1263
1264
1265 eth_hw_addr_random(dev);
1266
1267
1268 dev->features |= NETIF_F_LLTX;
1269
1270
1271 dev->features |= NETIF_F_NETNS_LOCAL;
1272
1273
1274 dev->features |= NETIF_F_VLAN_CHALLENGED;
1275
1276
1277 dev->features |= NETIF_F_GSO_SOFTWARE;
1278 dev->features |= NETIF_F_RXCSUM | NETIF_F_HW_CSUM | NETIF_F_SCTP_CRC;
1279 dev->features |= NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA;
1280
1281 dev->hw_features = dev->features;
1282 dev->hw_enc_features = dev->features;
1283
1284
1285 dev->priv_flags |= IFF_NO_QUEUE;
1286 dev->priv_flags |= IFF_NO_RX_HANDLER;
1287 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1288
1289
1290
1291
1292
1293 dev->min_mtu = IPV6_MIN_MTU;
1294 dev->max_mtu = ETH_MAX_MTU;
1295}
1296
1297static int vrf_validate(struct nlattr *tb[], struct nlattr *data[],
1298 struct netlink_ext_ack *extack)
1299{
1300 if (tb[IFLA_ADDRESS]) {
1301 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
1302 NL_SET_ERR_MSG(extack, "Invalid hardware address");
1303 return -EINVAL;
1304 }
1305 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
1306 NL_SET_ERR_MSG(extack, "Invalid hardware address");
1307 return -EADDRNOTAVAIL;
1308 }
1309 }
1310 return 0;
1311}
1312
1313static void vrf_dellink(struct net_device *dev, struct list_head *head)
1314{
1315 struct net_device *port_dev;
1316 struct list_head *iter;
1317
1318 netdev_for_each_lower_dev(dev, port_dev, iter)
1319 vrf_del_slave(dev, port_dev);
1320
1321 unregister_netdevice_queue(dev, head);
1322}
1323
1324static int vrf_newlink(struct net *src_net, struct net_device *dev,
1325 struct nlattr *tb[], struct nlattr *data[],
1326 struct netlink_ext_ack *extack)
1327{
1328 struct net_vrf *vrf = netdev_priv(dev);
1329 bool *add_fib_rules;
1330 struct net *net;
1331 int err;
1332
1333 if (!data || !data[IFLA_VRF_TABLE]) {
1334 NL_SET_ERR_MSG(extack, "VRF table id is missing");
1335 return -EINVAL;
1336 }
1337
1338 vrf->tb_id = nla_get_u32(data[IFLA_VRF_TABLE]);
1339 if (vrf->tb_id == RT_TABLE_UNSPEC) {
1340 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VRF_TABLE],
1341 "Invalid VRF table id");
1342 return -EINVAL;
1343 }
1344
1345 dev->priv_flags |= IFF_L3MDEV_MASTER;
1346
1347 err = register_netdevice(dev);
1348 if (err)
1349 goto out;
1350
1351 net = dev_net(dev);
1352 add_fib_rules = net_generic(net, vrf_net_id);
1353 if (*add_fib_rules) {
1354 err = vrf_add_fib_rules(dev);
1355 if (err) {
1356 unregister_netdevice(dev);
1357 goto out;
1358 }
1359 *add_fib_rules = false;
1360 }
1361
1362out:
1363 return err;
1364}
1365
1366static size_t vrf_nl_getsize(const struct net_device *dev)
1367{
1368 return nla_total_size(sizeof(u32));
1369}
1370
1371static int vrf_fillinfo(struct sk_buff *skb,
1372 const struct net_device *dev)
1373{
1374 struct net_vrf *vrf = netdev_priv(dev);
1375
1376 return nla_put_u32(skb, IFLA_VRF_TABLE, vrf->tb_id);
1377}
1378
1379static size_t vrf_get_slave_size(const struct net_device *bond_dev,
1380 const struct net_device *slave_dev)
1381{
1382 return nla_total_size(sizeof(u32));
1383}
1384
1385static int vrf_fill_slave_info(struct sk_buff *skb,
1386 const struct net_device *vrf_dev,
1387 const struct net_device *slave_dev)
1388{
1389 struct net_vrf *vrf = netdev_priv(vrf_dev);
1390
1391 if (nla_put_u32(skb, IFLA_VRF_PORT_TABLE, vrf->tb_id))
1392 return -EMSGSIZE;
1393
1394 return 0;
1395}
1396
1397static const struct nla_policy vrf_nl_policy[IFLA_VRF_MAX + 1] = {
1398 [IFLA_VRF_TABLE] = { .type = NLA_U32 },
1399};
1400
1401static struct rtnl_link_ops vrf_link_ops __read_mostly = {
1402 .kind = DRV_NAME,
1403 .priv_size = sizeof(struct net_vrf),
1404
1405 .get_size = vrf_nl_getsize,
1406 .policy = vrf_nl_policy,
1407 .validate = vrf_validate,
1408 .fill_info = vrf_fillinfo,
1409
1410 .get_slave_size = vrf_get_slave_size,
1411 .fill_slave_info = vrf_fill_slave_info,
1412
1413 .newlink = vrf_newlink,
1414 .dellink = vrf_dellink,
1415 .setup = vrf_setup,
1416 .maxtype = IFLA_VRF_MAX,
1417};
1418
1419static int vrf_device_event(struct notifier_block *unused,
1420 unsigned long event, void *ptr)
1421{
1422 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1423
1424
1425 if (event == NETDEV_UNREGISTER) {
1426 struct net_device *vrf_dev;
1427
1428 if (!netif_is_l3_slave(dev))
1429 goto out;
1430
1431 vrf_dev = netdev_master_upper_dev_get(dev);
1432 vrf_del_slave(vrf_dev, dev);
1433 }
1434out:
1435 return NOTIFY_DONE;
1436}
1437
1438static struct notifier_block vrf_notifier_block __read_mostly = {
1439 .notifier_call = vrf_device_event,
1440};
1441
1442
1443static int __net_init vrf_netns_init(struct net *net)
1444{
1445 bool *add_fib_rules = net_generic(net, vrf_net_id);
1446
1447 *add_fib_rules = true;
1448
1449 return 0;
1450}
1451
1452static struct pernet_operations vrf_net_ops __net_initdata = {
1453 .init = vrf_netns_init,
1454 .id = &vrf_net_id,
1455 .size = sizeof(bool),
1456};
1457
1458static int __init vrf_init_module(void)
1459{
1460 int rc;
1461
1462 register_netdevice_notifier(&vrf_notifier_block);
1463
1464 rc = register_pernet_subsys(&vrf_net_ops);
1465 if (rc < 0)
1466 goto error;
1467
1468 rc = rtnl_link_register(&vrf_link_ops);
1469 if (rc < 0) {
1470 unregister_pernet_subsys(&vrf_net_ops);
1471 goto error;
1472 }
1473
1474 return 0;
1475
1476error:
1477 unregister_netdevice_notifier(&vrf_notifier_block);
1478 return rc;
1479}
1480
1481module_init(vrf_init_module);
1482MODULE_AUTHOR("Shrijeet Mukherjee, David Ahern");
1483MODULE_DESCRIPTION("Device driver to instantiate VRF domains");
1484MODULE_LICENSE("GPL");
1485MODULE_ALIAS_RTNL_LINK(DRV_NAME);
1486MODULE_VERSION(DRV_VERSION);
1487
