1
2
3
4
5
6
7
8
9
10
11
12
13
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
45
46static unsigned int vrf_net_id;
47
48struct net_vrf {
49 struct rtable __rcu *rth;
50 struct rt6_info __rcu *rt6;
51#if IS_ENABLED(CONFIG_IPV6)
52 struct fib6_table *fib6_table;
53#endif
54 u32 tb_id;
55};
56
57struct pcpu_dstats {
58 u64 tx_pkts;
59 u64 tx_bytes;
60 u64 tx_drps;
61 u64 rx_pkts;
62 u64 rx_bytes;
63 u64 rx_drps;
64 struct u64_stats_sync syncp;
65};
66
67static void vrf_rx_stats(struct net_device *dev, int len)
68{
69 struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats);
70
71 u64_stats_update_begin(&dstats->syncp);
72 dstats->rx_pkts++;
73 dstats->rx_bytes += len;
74 u64_stats_update_end(&dstats->syncp);
75}
76
77static void vrf_tx_error(struct net_device *vrf_dev, struct sk_buff *skb)
78{
79 vrf_dev->stats.tx_errors++;
80 kfree_skb(skb);
81}
82
83static void vrf_get_stats64(struct net_device *dev,
84 struct rtnl_link_stats64 *stats)
85{
86 int i;
87
88 for_each_possible_cpu(i) {
89 const struct pcpu_dstats *dstats;
90 u64 tbytes, tpkts, tdrops, rbytes, rpkts;
91 unsigned int start;
92
93 dstats = per_cpu_ptr(dev->dstats, i);
94 do {
95 start = u64_stats_fetch_begin_irq(&dstats->syncp);
96 tbytes = dstats->tx_bytes;
97 tpkts = dstats->tx_pkts;
98 tdrops = dstats->tx_drps;
99 rbytes = dstats->rx_bytes;
100 rpkts = dstats->rx_pkts;
101 } while (u64_stats_fetch_retry_irq(&dstats->syncp, start));
102 stats->tx_bytes += tbytes;
103 stats->tx_packets += tpkts;
104 stats->tx_dropped += tdrops;
105 stats->rx_bytes += rbytes;
106 stats->rx_packets += rpkts;
107 }
108}
109
110
111
112
113static bool qdisc_tx_is_default(const struct net_device *dev)
114{
115 struct netdev_queue *txq;
116 struct Qdisc *qdisc;
117
118 if (dev->num_tx_queues > 1)
119 return false;
120
121 txq = netdev_get_tx_queue(dev, 0);
122 qdisc = rcu_access_pointer(txq->qdisc);
123
124 return !qdisc->enqueue;
125}
126
127
128
129
130static int vrf_local_xmit(struct sk_buff *skb, struct net_device *dev,
131 struct dst_entry *dst)
132{
133 int len = skb->len;
134
135 skb_orphan(skb);
136
137 skb_dst_set(skb, dst);
138
139
140
141
142 skb->pkt_type = PACKET_LOOPBACK;
143
144 skb->protocol = eth_type_trans(skb, dev);
145
146 if (likely(netif_rx(skb) == NET_RX_SUCCESS))
147 vrf_rx_stats(dev, len);
148 else
149 this_cpu_inc(dev->dstats->rx_drps);
150
151 return NETDEV_TX_OK;
152}
153
154#if IS_ENABLED(CONFIG_IPV6)
155static int vrf_ip6_local_out(struct net *net, struct sock *sk,
156 struct sk_buff *skb)
157{
158 int err;
159
160 err = nf_hook(NFPROTO_IPV6, NF_INET_LOCAL_OUT, net,
161 sk, skb, NULL, skb_dst(skb)->dev, dst_output);
162
163 if (likely(err == 1))
164 err = dst_output(net, sk, skb);
165
166 return err;
167}
168
169static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb,
170 struct net_device *dev)
171{
172 const struct ipv6hdr *iph = ipv6_hdr(skb);
173 struct net *net = dev_net(skb->dev);
174 struct flowi6 fl6 = {
175
176 .flowi6_oif = dev->ifindex,
177 .flowi6_iif = LOOPBACK_IFINDEX,
178 .daddr = iph->daddr,
179 .saddr = iph->saddr,
180 .flowlabel = ip6_flowinfo(iph),
181 .flowi6_mark = skb->mark,
182 .flowi6_proto = iph->nexthdr,
183 .flowi6_flags = FLOWI_FLAG_SKIP_NH_OIF,
184 };
185 int ret = NET_XMIT_DROP;
186 struct dst_entry *dst;
187 struct dst_entry *dst_null = &net->ipv6.ip6_null_entry->dst;
188
189 dst = ip6_route_output(net, NULL, &fl6);
190 if (dst == dst_null)
191 goto err;
192
193 skb_dst_drop(skb);
194
195
196
197
198
199 if (dst->dev == dev)
200 return vrf_local_xmit(skb, dev, dst);
201
202 skb_dst_set(skb, dst);
203
204
205 __skb_pull(skb, skb_network_offset(skb));
206
207 ret = vrf_ip6_local_out(net, skb->sk, skb);
208 if (unlikely(net_xmit_eval(ret)))
209 dev->stats.tx_errors++;
210 else
211 ret = NET_XMIT_SUCCESS;
212
213 return ret;
214err:
215 vrf_tx_error(dev, skb);
216 return NET_XMIT_DROP;
217}
218#else
219static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb,
220 struct net_device *dev)
221{
222 vrf_tx_error(dev, skb);
223 return NET_XMIT_DROP;
224}
225#endif
226
227
228static int vrf_ip_local_out(struct net *net, struct sock *sk,
229 struct sk_buff *skb)
230{
231 int err;
232
233 err = nf_hook(NFPROTO_IPV4, NF_INET_LOCAL_OUT, net, sk,
234 skb, NULL, skb_dst(skb)->dev, dst_output);
235 if (likely(err == 1))
236 err = dst_output(net, sk, skb);
237
238 return err;
239}
240
241static netdev_tx_t vrf_process_v4_outbound(struct sk_buff *skb,
242 struct net_device *vrf_dev)
243{
244 struct iphdr *ip4h = ip_hdr(skb);
245 int ret = NET_XMIT_DROP;
246 struct flowi4 fl4 = {
247
248 .flowi4_oif = vrf_dev->ifindex,
249 .flowi4_iif = LOOPBACK_IFINDEX,
250 .flowi4_tos = RT_TOS(ip4h->tos),
251 .flowi4_flags = FLOWI_FLAG_ANYSRC | FLOWI_FLAG_SKIP_NH_OIF,
252 .flowi4_proto = ip4h->protocol,
253 .daddr = ip4h->daddr,
254 .saddr = ip4h->saddr,
255 };
256 struct net *net = dev_net(vrf_dev);
257 struct rtable *rt;
258
259 rt = ip_route_output_flow(net, &fl4, NULL);
260 if (IS_ERR(rt))
261 goto err;
262
263 skb_dst_drop(skb);
264
265
266
267
268
269 if (rt->dst.dev == vrf_dev)
270 return vrf_local_xmit(skb, vrf_dev, &rt->dst);
271
272 skb_dst_set(skb, &rt->dst);
273
274
275 __skb_pull(skb, skb_network_offset(skb));
276
277 if (!ip4h->saddr) {
278 ip4h->saddr = inet_select_addr(skb_dst(skb)->dev, 0,
279 RT_SCOPE_LINK);
280 }
281
282 ret = vrf_ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb);
283 if (unlikely(net_xmit_eval(ret)))
284 vrf_dev->stats.tx_errors++;
285 else
286 ret = NET_XMIT_SUCCESS;
287
288out:
289 return ret;
290err:
291 vrf_tx_error(vrf_dev, skb);
292 goto out;
293}
294
295static netdev_tx_t is_ip_tx_frame(struct sk_buff *skb, struct net_device *dev)
296{
297 switch (skb->protocol) {
298 case htons(ETH_P_IP):
299 return vrf_process_v4_outbound(skb, dev);
300 case htons(ETH_P_IPV6):
301 return vrf_process_v6_outbound(skb, dev);
302 default:
303 vrf_tx_error(dev, skb);
304 return NET_XMIT_DROP;
305 }
306}
307
308static netdev_tx_t vrf_xmit(struct sk_buff *skb, struct net_device *dev)
309{
310 int len = skb->len;
311 netdev_tx_t ret = is_ip_tx_frame(skb, dev);
312
313 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
314 struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats);
315
316 u64_stats_update_begin(&dstats->syncp);
317 dstats->tx_pkts++;
318 dstats->tx_bytes += len;
319 u64_stats_update_end(&dstats->syncp);
320 } else {
321 this_cpu_inc(dev->dstats->tx_drps);
322 }
323
324 return ret;
325}
326
327static int vrf_finish_direct(struct net *net, struct sock *sk,
328 struct sk_buff *skb)
329{
330 struct net_device *vrf_dev = skb->dev;
331
332 if (!list_empty(&vrf_dev->ptype_all) &&
333 likely(skb_headroom(skb) >= ETH_HLEN)) {
334 struct ethhdr *eth = skb_push(skb, ETH_HLEN);
335
336 ether_addr_copy(eth->h_source, vrf_dev->dev_addr);
337 eth_zero_addr(eth->h_dest);
338 eth->h_proto = skb->protocol;
339
340 rcu_read_lock_bh();
341 dev_queue_xmit_nit(skb, vrf_dev);
342 rcu_read_unlock_bh();
343
344 skb_pull(skb, ETH_HLEN);
345 }
346
347 return 1;
348}
349
350#if IS_ENABLED(CONFIG_IPV6)
351
352static int vrf_finish_output6(struct net *net, struct sock *sk,
353 struct sk_buff *skb)
354{
355 struct dst_entry *dst = skb_dst(skb);
356 struct net_device *dev = dst->dev;
357 struct neighbour *neigh;
358 struct in6_addr *nexthop;
359 int ret;
360
361 nf_reset(skb);
362
363 skb->protocol = htons(ETH_P_IPV6);
364 skb->dev = dev;
365
366 rcu_read_lock_bh();
367 nexthop = rt6_nexthop((struct rt6_info *)dst, &ipv6_hdr(skb)->daddr);
368 neigh = __ipv6_neigh_lookup_noref(dst->dev, nexthop);
369 if (unlikely(!neigh))
370 neigh = __neigh_create(&nd_tbl, nexthop, dst->dev, false);
371 if (!IS_ERR(neigh)) {
372 sock_confirm_neigh(skb, neigh);
373 ret = neigh_output(neigh, skb);
374 rcu_read_unlock_bh();
375 return ret;
376 }
377 rcu_read_unlock_bh();
378
379 IP6_INC_STATS(dev_net(dst->dev),
380 ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES);
381 kfree_skb(skb);
382 return -EINVAL;
383}
384
385
386static int vrf_output6(struct net *net, struct sock *sk, struct sk_buff *skb)
387{
388 return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING,
389 net, sk, skb, NULL, skb_dst(skb)->dev,
390 vrf_finish_output6,
391 !(IP6CB(skb)->flags & IP6SKB_REROUTED));
392}
393
394
395
396
397
398static struct sk_buff *vrf_ip6_out_redirect(struct net_device *vrf_dev,
399 struct sk_buff *skb)
400{
401 struct net_vrf *vrf = netdev_priv(vrf_dev);
402 struct dst_entry *dst = NULL;
403 struct rt6_info *rt6;
404
405 rcu_read_lock();
406
407 rt6 = rcu_dereference(vrf->rt6);
408 if (likely(rt6)) {
409 dst = &rt6->dst;
410 dst_hold(dst);
411 }
412
413 rcu_read_unlock();
414
415 if (unlikely(!dst)) {
416 vrf_tx_error(vrf_dev, skb);
417 return NULL;
418 }
419
420 skb_dst_drop(skb);
421 skb_dst_set(skb, dst);
422
423 return skb;
424}
425
426static int vrf_output6_direct(struct net *net, struct sock *sk,
427 struct sk_buff *skb)
428{
429 skb->protocol = htons(ETH_P_IPV6);
430
431 return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING,
432 net, sk, skb, NULL, skb->dev,
433 vrf_finish_direct,
434 !(IPCB(skb)->flags & IPSKB_REROUTED));
435}
436
437static struct sk_buff *vrf_ip6_out_direct(struct net_device *vrf_dev,
438 struct sock *sk,
439 struct sk_buff *skb)
440{
441 struct net *net = dev_net(vrf_dev);
442 int err;
443
444 skb->dev = vrf_dev;
445
446 err = nf_hook(NFPROTO_IPV6, NF_INET_LOCAL_OUT, net, sk,
447 skb, NULL, vrf_dev, vrf_output6_direct);
448
449 if (likely(err == 1))
450 err = vrf_output6_direct(net, sk, skb);
451
452
453 if (likely(err == 1))
454 nf_reset(skb);
455 else
456 skb = NULL;
457
458 return skb;
459}
460
461static struct sk_buff *vrf_ip6_out(struct net_device *vrf_dev,
462 struct sock *sk,
463 struct sk_buff *skb)
464{
465
466 if (rt6_need_strict(&ipv6_hdr(skb)->daddr))
467 return skb;
468
469 if (qdisc_tx_is_default(vrf_dev))
470 return vrf_ip6_out_direct(vrf_dev, sk, skb);
471
472 return vrf_ip6_out_redirect(vrf_dev, skb);
473}
474
475
476static void vrf_rt6_release(struct net_device *dev, struct net_vrf *vrf)
477{
478 struct rt6_info *rt6 = rtnl_dereference(vrf->rt6);
479 struct net *net = dev_net(dev);
480 struct dst_entry *dst;
481
482 RCU_INIT_POINTER(vrf->rt6, NULL);
483 synchronize_rcu();
484
485
486
487
488 if (rt6) {
489 dst = &rt6->dst;
490 dev_put(dst->dev);
491 dst->dev = net->loopback_dev;
492 dev_hold(dst->dev);
493 dst_release(dst);
494 }
495}
496
497static int vrf_rt6_create(struct net_device *dev)
498{
499 int flags = DST_HOST | DST_NOPOLICY | DST_NOXFRM;
500 struct net_vrf *vrf = netdev_priv(dev);
501 struct net *net = dev_net(dev);
502 struct rt6_info *rt6;
503 int rc = -ENOMEM;
504
505
506 if (!ipv6_mod_enabled())
507 return 0;
508
509 vrf->fib6_table = fib6_new_table(net, vrf->tb_id);
510 if (!vrf->fib6_table)
511 goto out;
512
513
514 rt6 = ip6_dst_alloc(net, dev, flags);
515 if (!rt6)
516 goto out;
517
518 rt6->dst.output = vrf_output6;
519
520 rcu_assign_pointer(vrf->rt6, rt6);
521
522 rc = 0;
523out:
524 return rc;
525}
526#else
527static struct sk_buff *vrf_ip6_out(struct net_device *vrf_dev,
528 struct sock *sk,
529 struct sk_buff *skb)
530{
531 return skb;
532}
533
534static void vrf_rt6_release(struct net_device *dev, struct net_vrf *vrf)
535{
536}
537
538static int vrf_rt6_create(struct net_device *dev)
539{
540 return 0;
541}
542#endif
543
544
545static int vrf_finish_output(struct net *net, struct sock *sk, struct sk_buff *skb)
546{
547 struct dst_entry *dst = skb_dst(skb);
548 struct rtable *rt = (struct rtable *)dst;
549 struct net_device *dev = dst->dev;
550 unsigned int hh_len = LL_RESERVED_SPACE(dev);
551 struct neighbour *neigh;
552 u32 nexthop;
553 int ret = -EINVAL;
554
555 nf_reset(skb);
556
557
558 if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) {
559 struct sk_buff *skb2;
560
561 skb2 = skb_realloc_headroom(skb, LL_RESERVED_SPACE(dev));
562 if (!skb2) {
563 ret = -ENOMEM;
564 goto err;
565 }
566 if (skb->sk)
567 skb_set_owner_w(skb2, skb->sk);
568
569 consume_skb(skb);
570 skb = skb2;
571 }
572
573 rcu_read_lock_bh();
574
575 nexthop = (__force u32)rt_nexthop(rt, ip_hdr(skb)->daddr);
576 neigh = __ipv4_neigh_lookup_noref(dev, nexthop);
577 if (unlikely(!neigh))
578 neigh = __neigh_create(&arp_tbl, &nexthop, dev, false);
579 if (!IS_ERR(neigh)) {
580 sock_confirm_neigh(skb, neigh);
581 ret = neigh_output(neigh, skb);
582 rcu_read_unlock_bh();
583 return ret;
584 }
585
586 rcu_read_unlock_bh();
587err:
588 vrf_tx_error(skb->dev, skb);
589 return ret;
590}
591
592static int vrf_output(struct net *net, struct sock *sk, struct sk_buff *skb)
593{
594 struct net_device *dev = skb_dst(skb)->dev;
595
596 IP_UPD_PO_STATS(net, IPSTATS_MIB_OUT, skb->len);
597
598 skb->dev = dev;
599 skb->protocol = htons(ETH_P_IP);
600
601 return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING,
602 net, sk, skb, NULL, dev,
603 vrf_finish_output,
604 !(IPCB(skb)->flags & IPSKB_REROUTED));
605}
606
607
608
609
610
611static struct sk_buff *vrf_ip_out_redirect(struct net_device *vrf_dev,
612 struct sk_buff *skb)
613{
614 struct net_vrf *vrf = netdev_priv(vrf_dev);
615 struct dst_entry *dst = NULL;
616 struct rtable *rth;
617
618 rcu_read_lock();
619
620 rth = rcu_dereference(vrf->rth);
621 if (likely(rth)) {
622 dst = &rth->dst;
623 dst_hold(dst);
624 }
625
626 rcu_read_unlock();
627
628 if (unlikely(!dst)) {
629 vrf_tx_error(vrf_dev, skb);
630 return NULL;
631 }
632
633 skb_dst_drop(skb);
634 skb_dst_set(skb, dst);
635
636 return skb;
637}
638
639static int vrf_output_direct(struct net *net, struct sock *sk,
640 struct sk_buff *skb)
641{
642 skb->protocol = htons(ETH_P_IP);
643
644 return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING,
645 net, sk, skb, NULL, skb->dev,
646 vrf_finish_direct,
647 !(IPCB(skb)->flags & IPSKB_REROUTED));
648}
649
650static struct sk_buff *vrf_ip_out_direct(struct net_device *vrf_dev,
651 struct sock *sk,
652 struct sk_buff *skb)
653{
654 struct net *net = dev_net(vrf_dev);
655 int err;
656
657 skb->dev = vrf_dev;
658
659 err = nf_hook(NFPROTO_IPV4, NF_INET_LOCAL_OUT, net, sk,
660 skb, NULL, vrf_dev, vrf_output_direct);
661
662 if (likely(err == 1))
663 err = vrf_output_direct(net, sk, skb);
664
665
666 if (likely(err == 1))
667 nf_reset(skb);
668 else
669 skb = NULL;
670
671 return skb;
672}
673
674static struct sk_buff *vrf_ip_out(struct net_device *vrf_dev,
675 struct sock *sk,
676 struct sk_buff *skb)
677{
678
679 if (ipv4_is_multicast(ip_hdr(skb)->daddr) ||
680 ipv4_is_lbcast(ip_hdr(skb)->daddr))
681 return skb;
682
683 if (qdisc_tx_is_default(vrf_dev))
684 return vrf_ip_out_direct(vrf_dev, sk, skb);
685
686 return vrf_ip_out_redirect(vrf_dev, skb);
687}
688
689
690static struct sk_buff *vrf_l3_out(struct net_device *vrf_dev,
691 struct sock *sk,
692 struct sk_buff *skb,
693 u16 proto)
694{
695 switch (proto) {
696 case AF_INET:
697 return vrf_ip_out(vrf_dev, sk, skb);
698 case AF_INET6:
699 return vrf_ip6_out(vrf_dev, sk, skb);
700 }
701
702 return skb;
703}
704
705
706static void vrf_rtable_release(struct net_device *dev, struct net_vrf *vrf)
707{
708 struct rtable *rth = rtnl_dereference(vrf->rth);
709 struct net *net = dev_net(dev);
710 struct dst_entry *dst;
711
712 RCU_INIT_POINTER(vrf->rth, NULL);
713 synchronize_rcu();
714
715
716
717
718 if (rth) {
719 dst = &rth->dst;
720 dev_put(dst->dev);
721 dst->dev = net->loopback_dev;
722 dev_hold(dst->dev);
723 dst_release(dst);
724 }
725}
726
727static int vrf_rtable_create(struct net_device *dev)
728{
729 struct net_vrf *vrf = netdev_priv(dev);
730 struct rtable *rth;
731
732 if (!fib_new_table(dev_net(dev), vrf->tb_id))
733 return -ENOMEM;
734
735
736 rth = rt_dst_alloc(dev, 0, RTN_UNICAST, 1, 1, 0);
737 if (!rth)
738 return -ENOMEM;
739
740 rth->dst.output = vrf_output;
741
742 rcu_assign_pointer(vrf->rth, rth);
743
744 return 0;
745}
746
747
748
749
750static void cycle_netdev(struct net_device *dev,
751 struct netlink_ext_ack *extack)
752{
753 unsigned int flags = dev->flags;
754 int ret;
755
756 if (!netif_running(dev))
757 return;
758
759 ret = dev_change_flags(dev, flags & ~IFF_UP, extack);
760 if (ret >= 0)
761 ret = dev_change_flags(dev, flags, extack);
762
763 if (ret < 0) {
764 netdev_err(dev,
765 "Failed to cycle device %s; route tables might be wrong!\n",
766 dev->name);
767 }
768}
769
770static int do_vrf_add_slave(struct net_device *dev, struct net_device *port_dev,
771 struct netlink_ext_ack *extack)
772{
773 int ret;
774
775
776
777
778 if (port_dev == dev_net(dev)->loopback_dev) {
779 NL_SET_ERR_MSG(extack,
780 "Can not enslave loopback device to a VRF");
781 return -EOPNOTSUPP;
782 }
783
784 port_dev->priv_flags |= IFF_L3MDEV_SLAVE;
785 ret = netdev_master_upper_dev_link(port_dev, dev, NULL, NULL, extack);
786 if (ret < 0)
787 goto err;
788
789 cycle_netdev(port_dev, extack);
790
791 return 0;
792
793err:
794 port_dev->priv_flags &= ~IFF_L3MDEV_SLAVE;
795 return ret;
796}
797
798static int vrf_add_slave(struct net_device *dev, struct net_device *port_dev,
799 struct netlink_ext_ack *extack)
800{
801 if (netif_is_l3_master(port_dev)) {
802 NL_SET_ERR_MSG(extack,
803 "Can not enslave an L3 master device to a VRF");
804 return -EINVAL;
805 }
806
807 if (netif_is_l3_slave(port_dev))
808 return -EINVAL;
809
810 return do_vrf_add_slave(dev, port_dev, extack);
811}
812
813
814static int do_vrf_del_slave(struct net_device *dev, struct net_device *port_dev)
815{
816 netdev_upper_dev_unlink(port_dev, dev);
817 port_dev->priv_flags &= ~IFF_L3MDEV_SLAVE;
818
819 cycle_netdev(port_dev, NULL);
820
821 return 0;
822}
823
824static int vrf_del_slave(struct net_device *dev, struct net_device *port_dev)
825{
826 return do_vrf_del_slave(dev, port_dev);
827}
828
829static void vrf_dev_uninit(struct net_device *dev)
830{
831 struct net_vrf *vrf = netdev_priv(dev);
832
833 vrf_rtable_release(dev, vrf);
834 vrf_rt6_release(dev, vrf);
835
836 free_percpu(dev->dstats);
837 dev->dstats = NULL;
838}
839
840static int vrf_dev_init(struct net_device *dev)
841{
842 struct net_vrf *vrf = netdev_priv(dev);
843
844 dev->dstats = netdev_alloc_pcpu_stats(struct pcpu_dstats);
845 if (!dev->dstats)
846 goto out_nomem;
847
848
849 if (vrf_rtable_create(dev) != 0)
850 goto out_stats;
851
852 if (vrf_rt6_create(dev) != 0)
853 goto out_rth;
854
855 dev->flags = IFF_MASTER | IFF_NOARP;
856
857
858 dev->mtu = 64 * 1024;
859
860
861 dev->operstate = IF_OPER_UP;
862 netdev_lockdep_set_classes(dev);
863 return 0;
864
865out_rth:
866 vrf_rtable_release(dev, vrf);
867out_stats:
868 free_percpu(dev->dstats);
869 dev->dstats = NULL;
870out_nomem:
871 return -ENOMEM;
872}
873
874static const struct net_device_ops vrf_netdev_ops = {
875 .ndo_init = vrf_dev_init,
876 .ndo_uninit = vrf_dev_uninit,
877 .ndo_start_xmit = vrf_xmit,
878 .ndo_get_stats64 = vrf_get_stats64,
879 .ndo_add_slave = vrf_add_slave,
880 .ndo_del_slave = vrf_del_slave,
881};
882
883static u32 vrf_fib_table(const struct net_device *dev)
884{
885 struct net_vrf *vrf = netdev_priv(dev);
886
887 return vrf->tb_id;
888}
889
890static int vrf_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb)
891{
892 kfree_skb(skb);
893 return 0;
894}
895
896static struct sk_buff *vrf_rcv_nfhook(u8 pf, unsigned int hook,
897 struct sk_buff *skb,
898 struct net_device *dev)
899{
900 struct net *net = dev_net(dev);
901
902 if (nf_hook(pf, hook, net, NULL, skb, dev, NULL, vrf_rcv_finish) != 1)
903 skb = NULL;
904
905 return skb;
906}
907
908#if IS_ENABLED(CONFIG_IPV6)
909
910
911
912
913
914static bool ipv6_ndisc_frame(const struct sk_buff *skb)
915{
916 const struct ipv6hdr *iph = ipv6_hdr(skb);
917 bool rc = false;
918
919 if (iph->nexthdr == NEXTHDR_ICMP) {
920 const struct icmp6hdr *icmph;
921 struct icmp6hdr _icmph;
922
923 icmph = skb_header_pointer(skb, sizeof(*iph),
924 sizeof(_icmph), &_icmph);
925 if (!icmph)
926 goto out;
927
928 switch (icmph->icmp6_type) {
929 case NDISC_ROUTER_SOLICITATION:
930 case NDISC_ROUTER_ADVERTISEMENT:
931 case NDISC_NEIGHBOUR_SOLICITATION:
932 case NDISC_NEIGHBOUR_ADVERTISEMENT:
933 case NDISC_REDIRECT:
934 rc = true;
935 break;
936 }
937 }
938
939out:
940 return rc;
941}
942
943static struct rt6_info *vrf_ip6_route_lookup(struct net *net,
944 const struct net_device *dev,
945 struct flowi6 *fl6,
946 int ifindex,
947 const struct sk_buff *skb,
948 int flags)
949{
950 struct net_vrf *vrf = netdev_priv(dev);
951
952 return ip6_pol_route(net, vrf->fib6_table, ifindex, fl6, skb, flags);
953}
954
955static void vrf_ip6_input_dst(struct sk_buff *skb, struct net_device *vrf_dev,
956 int ifindex)
957{
958 const struct ipv6hdr *iph = ipv6_hdr(skb);
959 struct flowi6 fl6 = {
960 .flowi6_iif = ifindex,
961 .flowi6_mark = skb->mark,
962 .flowi6_proto = iph->nexthdr,
963 .daddr = iph->daddr,
964 .saddr = iph->saddr,
965 .flowlabel = ip6_flowinfo(iph),
966 };
967 struct net *net = dev_net(vrf_dev);
968 struct rt6_info *rt6;
969
970 rt6 = vrf_ip6_route_lookup(net, vrf_dev, &fl6, ifindex, skb,
971 RT6_LOOKUP_F_HAS_SADDR | RT6_LOOKUP_F_IFACE);
972 if (unlikely(!rt6))
973 return;
974
975 if (unlikely(&rt6->dst == &net->ipv6.ip6_null_entry->dst))
976 return;
977
978 skb_dst_set(skb, &rt6->dst);
979}
980
981static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev,
982 struct sk_buff *skb)
983{
984 int orig_iif = skb->skb_iif;
985 bool need_strict = rt6_need_strict(&ipv6_hdr(skb)->daddr);
986 bool is_ndisc = ipv6_ndisc_frame(skb);
987
988
989
990
991 if (skb->pkt_type == PACKET_LOOPBACK || (need_strict && !is_ndisc)) {
992 skb->dev = vrf_dev;
993 skb->skb_iif = vrf_dev->ifindex;
994 IP6CB(skb)->flags |= IP6SKB_L3SLAVE;
995 if (skb->pkt_type == PACKET_LOOPBACK)
996 skb->pkt_type = PACKET_HOST;
997 goto out;
998 }
999
1000
1001 if (!is_ndisc) {
1002 vrf_rx_stats(vrf_dev, skb->len);
1003 skb->dev = vrf_dev;
1004 skb->skb_iif = vrf_dev->ifindex;
1005
1006 if (!list_empty(&vrf_dev->ptype_all)) {
1007 skb_push(skb, skb->mac_len);
1008 dev_queue_xmit_nit(skb, vrf_dev);
1009 skb_pull(skb, skb->mac_len);
1010 }
1011
1012 IP6CB(skb)->flags |= IP6SKB_L3SLAVE;
1013 }
1014
1015 if (need_strict)
1016 vrf_ip6_input_dst(skb, vrf_dev, orig_iif);
1017
1018 skb = vrf_rcv_nfhook(NFPROTO_IPV6, NF_INET_PRE_ROUTING, skb, vrf_dev);
1019out:
1020 return skb;
1021}
1022
1023#else
1024static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev,
1025 struct sk_buff *skb)
1026{
1027 return skb;
1028}
1029#endif
1030
1031static struct sk_buff *vrf_ip_rcv(struct net_device *vrf_dev,
1032 struct sk_buff *skb)
1033{
1034 skb->dev = vrf_dev;
1035 skb->skb_iif = vrf_dev->ifindex;
1036 IPCB(skb)->flags |= IPSKB_L3SLAVE;
1037
1038 if (ipv4_is_multicast(ip_hdr(skb)->daddr))
1039 goto out;
1040
1041
1042
1043
1044 if (skb->pkt_type == PACKET_LOOPBACK) {
1045 skb->pkt_type = PACKET_HOST;
1046 goto out;
1047 }
1048
1049 vrf_rx_stats(vrf_dev, skb->len);
1050
1051 if (!list_empty(&vrf_dev->ptype_all)) {
1052 skb_push(skb, skb->mac_len);
1053 dev_queue_xmit_nit(skb, vrf_dev);
1054 skb_pull(skb, skb->mac_len);
1055 }
1056
1057 skb = vrf_rcv_nfhook(NFPROTO_IPV4, NF_INET_PRE_ROUTING, skb, vrf_dev);
1058out:
1059 return skb;
1060}
1061
1062
1063static struct sk_buff *vrf_l3_rcv(struct net_device *vrf_dev,
1064 struct sk_buff *skb,
1065 u16 proto)
1066{
1067 switch (proto) {
1068 case AF_INET:
1069 return vrf_ip_rcv(vrf_dev, skb);
1070 case AF_INET6:
1071 return vrf_ip6_rcv(vrf_dev, skb);
1072 }
1073
1074 return skb;
1075}
1076
1077#if IS_ENABLED(CONFIG_IPV6)
1078
1079
1080
1081static struct dst_entry *vrf_link_scope_lookup(const struct net_device *dev,
1082 struct flowi6 *fl6)
1083{
1084 struct net *net = dev_net(dev);
1085 int flags = RT6_LOOKUP_F_IFACE;
1086 struct dst_entry *dst = NULL;
1087 struct rt6_info *rt;
1088
1089
1090
1091
1092
1093 if (fl6->flowi6_oif == dev->ifindex) {
1094 dst = &net->ipv6.ip6_null_entry->dst;
1095 dst_hold(dst);
1096 return dst;
1097 }
1098
1099 if (!ipv6_addr_any(&fl6->saddr))
1100 flags |= RT6_LOOKUP_F_HAS_SADDR;
1101
1102 rt = vrf_ip6_route_lookup(net, dev, fl6, fl6->flowi6_oif, NULL, flags);
1103 if (rt)
1104 dst = &rt->dst;
1105
1106 return dst;
1107}
1108#endif
1109
1110static const struct l3mdev_ops vrf_l3mdev_ops = {
1111 .l3mdev_fib_table = vrf_fib_table,
1112 .l3mdev_l3_rcv = vrf_l3_rcv,
1113 .l3mdev_l3_out = vrf_l3_out,
1114#if IS_ENABLED(CONFIG_IPV6)
1115 .l3mdev_link_scope_lookup = vrf_link_scope_lookup,
1116#endif
1117};
1118
1119static void vrf_get_drvinfo(struct net_device *dev,
1120 struct ethtool_drvinfo *info)
1121{
1122 strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
1123 strlcpy(info->version, DRV_VERSION, sizeof(info->version));
1124}
1125
1126static const struct ethtool_ops vrf_ethtool_ops = {
1127 .get_drvinfo = vrf_get_drvinfo,
1128};
1129
1130static inline size_t vrf_fib_rule_nl_size(void)
1131{
1132 size_t sz;
1133
1134 sz = NLMSG_ALIGN(sizeof(struct fib_rule_hdr));
1135 sz += nla_total_size(sizeof(u8));
1136 sz += nla_total_size(sizeof(u32));
1137 sz += nla_total_size(sizeof(u8));
1138
1139 return sz;
1140}
1141
1142static int vrf_fib_rule(const struct net_device *dev, __u8 family, bool add_it)
1143{
1144 struct fib_rule_hdr *frh;
1145 struct nlmsghdr *nlh;
1146 struct sk_buff *skb;
1147 int err;
1148
1149 if (family == AF_INET6 && !ipv6_mod_enabled())
1150 return 0;
1151
1152 skb = nlmsg_new(vrf_fib_rule_nl_size(), GFP_KERNEL);
1153 if (!skb)
1154 return -ENOMEM;
1155
1156 nlh = nlmsg_put(skb, 0, 0, 0, sizeof(*frh), 0);
1157 if (!nlh)
1158 goto nla_put_failure;
1159
1160
1161 nlh->nlmsg_flags |= NLM_F_EXCL;
1162
1163 frh = nlmsg_data(nlh);
1164 memset(frh, 0, sizeof(*frh));
1165 frh->family = family;
1166 frh->action = FR_ACT_TO_TBL;
1167
1168 if (nla_put_u8(skb, FRA_PROTOCOL, RTPROT_KERNEL))
1169 goto nla_put_failure;
1170
1171 if (nla_put_u8(skb, FRA_L3MDEV, 1))
1172 goto nla_put_failure;
1173
1174 if (nla_put_u32(skb, FRA_PRIORITY, FIB_RULE_PREF))
1175 goto nla_put_failure;
1176
1177 nlmsg_end(skb, nlh);
1178
1179
1180 skb->sk = dev_net(dev)->rtnl;
1181 if (add_it) {
1182 err = fib_nl_newrule(skb, nlh, NULL);
1183 if (err == -EEXIST)
1184 err = 0;
1185 } else {
1186 err = fib_nl_delrule(skb, nlh, NULL);
1187 if (err == -ENOENT)
1188 err = 0;
1189 }
1190 nlmsg_free(skb);
1191
1192 return err;
1193
1194nla_put_failure:
1195 nlmsg_free(skb);
1196
1197 return -EMSGSIZE;
1198}
1199
1200static int vrf_add_fib_rules(const struct net_device *dev)
1201{
1202 int err;
1203
1204 err = vrf_fib_rule(dev, AF_INET, true);
1205 if (err < 0)
1206 goto out_err;
1207
1208 err = vrf_fib_rule(dev, AF_INET6, true);
1209 if (err < 0)
1210 goto ipv6_err;
1211
1212#if IS_ENABLED(CONFIG_IP_MROUTE_MULTIPLE_TABLES)
1213 err = vrf_fib_rule(dev, RTNL_FAMILY_IPMR, true);
1214 if (err < 0)
1215 goto ipmr_err;
1216#endif
1217
1218#if IS_ENABLED(CONFIG_IPV6_MROUTE_MULTIPLE_TABLES)
1219 err = vrf_fib_rule(dev, RTNL_FAMILY_IP6MR, true);
1220 if (err < 0)
1221 goto ip6mr_err;
1222#endif
1223
1224 return 0;
1225
1226#if IS_ENABLED(CONFIG_IPV6_MROUTE_MULTIPLE_TABLES)
1227ip6mr_err:
1228 vrf_fib_rule(dev, RTNL_FAMILY_IPMR, false);
1229#endif
1230
1231#if IS_ENABLED(CONFIG_IP_MROUTE_MULTIPLE_TABLES)
1232ipmr_err:
1233 vrf_fib_rule(dev, AF_INET6, false);
1234#endif
1235
1236ipv6_err:
1237 vrf_fib_rule(dev, AF_INET, false);
1238
1239out_err:
1240 netdev_err(dev, "Failed to add FIB rules.\n");
1241 return err;
1242}
1243
1244static void vrf_setup(struct net_device *dev)
1245{
1246 ether_setup(dev);
1247
1248
1249 dev->netdev_ops = &vrf_netdev_ops;
1250 dev->l3mdev_ops = &vrf_l3mdev_ops;
1251 dev->ethtool_ops = &vrf_ethtool_ops;
1252 dev->needs_free_netdev = true;
1253
1254
1255 eth_hw_addr_random(dev);
1256
1257
1258 dev->features |= NETIF_F_LLTX;
1259
1260
1261 dev->features |= NETIF_F_NETNS_LOCAL;
1262
1263
1264 dev->features |= NETIF_F_VLAN_CHALLENGED;
1265
1266
1267 dev->features |= NETIF_F_GSO_SOFTWARE;
1268 dev->features |= NETIF_F_RXCSUM | NETIF_F_HW_CSUM | NETIF_F_SCTP_CRC;
1269 dev->features |= NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA;
1270
1271 dev->hw_features = dev->features;
1272 dev->hw_enc_features = dev->features;
1273
1274
1275 dev->priv_flags |= IFF_NO_QUEUE;
1276
1277 dev->min_mtu = 0;
1278 dev->max_mtu = 0;
1279}
1280
1281static int vrf_validate(struct nlattr *tb[], struct nlattr *data[],
1282 struct netlink_ext_ack *extack)
1283{
1284 if (tb[IFLA_ADDRESS]) {
1285 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
1286 NL_SET_ERR_MSG(extack, "Invalid hardware address");
1287 return -EINVAL;
1288 }
1289 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
1290 NL_SET_ERR_MSG(extack, "Invalid hardware address");
1291 return -EADDRNOTAVAIL;
1292 }
1293 }
1294 return 0;
1295}
1296
1297static void vrf_dellink(struct net_device *dev, struct list_head *head)
1298{
1299 struct net_device *port_dev;
1300 struct list_head *iter;
1301
1302 netdev_for_each_lower_dev(dev, port_dev, iter)
1303 vrf_del_slave(dev, port_dev);
1304
1305 unregister_netdevice_queue(dev, head);
1306}
1307
1308static int vrf_newlink(struct net *src_net, struct net_device *dev,
1309 struct nlattr *tb[], struct nlattr *data[],
1310 struct netlink_ext_ack *extack)
1311{
1312 struct net_vrf *vrf = netdev_priv(dev);
1313 bool *add_fib_rules;
1314 struct net *net;
1315 int err;
1316
1317 if (!data || !data[IFLA_VRF_TABLE]) {
1318 NL_SET_ERR_MSG(extack, "VRF table id is missing");
1319 return -EINVAL;
1320 }
1321
1322 vrf->tb_id = nla_get_u32(data[IFLA_VRF_TABLE]);
1323 if (vrf->tb_id == RT_TABLE_UNSPEC) {
1324 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VRF_TABLE],
1325 "Invalid VRF table id");
1326 return -EINVAL;
1327 }
1328
1329 dev->priv_flags |= IFF_L3MDEV_MASTER;
1330
1331 err = register_netdevice(dev);
1332 if (err)
1333 goto out;
1334
1335 net = dev_net(dev);
1336 add_fib_rules = net_generic(net, vrf_net_id);
1337 if (*add_fib_rules) {
1338 err = vrf_add_fib_rules(dev);
1339 if (err) {
1340 unregister_netdevice(dev);
1341 goto out;
1342 }
1343 *add_fib_rules = false;
1344 }
1345
1346out:
1347 return err;
1348}
1349
1350static size_t vrf_nl_getsize(const struct net_device *dev)
1351{
1352 return nla_total_size(sizeof(u32));
1353}
1354
1355static int vrf_fillinfo(struct sk_buff *skb,
1356 const struct net_device *dev)
1357{
1358 struct net_vrf *vrf = netdev_priv(dev);
1359
1360 return nla_put_u32(skb, IFLA_VRF_TABLE, vrf->tb_id);
1361}
1362
1363static size_t vrf_get_slave_size(const struct net_device *bond_dev,
1364 const struct net_device *slave_dev)
1365{
1366 return nla_total_size(sizeof(u32));
1367}
1368
1369static int vrf_fill_slave_info(struct sk_buff *skb,
1370 const struct net_device *vrf_dev,
1371 const struct net_device *slave_dev)
1372{
1373 struct net_vrf *vrf = netdev_priv(vrf_dev);
1374
1375 if (nla_put_u32(skb, IFLA_VRF_PORT_TABLE, vrf->tb_id))
1376 return -EMSGSIZE;
1377
1378 return 0;
1379}
1380
1381static const struct nla_policy vrf_nl_policy[IFLA_VRF_MAX + 1] = {
1382 [IFLA_VRF_TABLE] = { .type = NLA_U32 },
1383};
1384
1385static struct rtnl_link_ops vrf_link_ops __read_mostly = {
1386 .kind = DRV_NAME,
1387 .priv_size = sizeof(struct net_vrf),
1388
1389 .get_size = vrf_nl_getsize,
1390 .policy = vrf_nl_policy,
1391 .validate = vrf_validate,
1392 .fill_info = vrf_fillinfo,
1393
1394 .get_slave_size = vrf_get_slave_size,
1395 .fill_slave_info = vrf_fill_slave_info,
1396
1397 .newlink = vrf_newlink,
1398 .dellink = vrf_dellink,
1399 .setup = vrf_setup,
1400 .maxtype = IFLA_VRF_MAX,
1401};
1402
1403static int vrf_device_event(struct notifier_block *unused,
1404 unsigned long event, void *ptr)
1405{
1406 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1407
1408
1409 if (event == NETDEV_UNREGISTER) {
1410 struct net_device *vrf_dev;
1411
1412 if (!netif_is_l3_slave(dev))
1413 goto out;
1414
1415 vrf_dev = netdev_master_upper_dev_get(dev);
1416 vrf_del_slave(vrf_dev, dev);
1417 }
1418out:
1419 return NOTIFY_DONE;
1420}
1421
1422static struct notifier_block vrf_notifier_block __read_mostly = {
1423 .notifier_call = vrf_device_event,
1424};
1425
1426
1427static int __net_init vrf_netns_init(struct net *net)
1428{
1429 bool *add_fib_rules = net_generic(net, vrf_net_id);
1430
1431 *add_fib_rules = true;
1432
1433 return 0;
1434}
1435
1436static struct pernet_operations vrf_net_ops __net_initdata = {
1437 .init = vrf_netns_init,
1438 .id = &vrf_net_id,
1439 .size = sizeof(bool),
1440};
1441
1442static int __init vrf_init_module(void)
1443{
1444 int rc;
1445
1446 register_netdevice_notifier(&vrf_notifier_block);
1447
1448 rc = register_pernet_subsys(&vrf_net_ops);
1449 if (rc < 0)
1450 goto error;
1451
1452 rc = rtnl_link_register(&vrf_link_ops);
1453 if (rc < 0) {
1454 unregister_pernet_subsys(&vrf_net_ops);
1455 goto error;
1456 }
1457
1458 return 0;
1459
1460error:
1461 unregister_netdevice_notifier(&vrf_notifier_block);
1462 return rc;
1463}
1464
1465module_init(vrf_init_module);
1466MODULE_AUTHOR("Shrijeet Mukherjee, David Ahern");
1467MODULE_DESCRIPTION("Device driver to instantiate VRF domains");
1468MODULE_LICENSE("GPL");
1469MODULE_ALIAS_RTNL_LINK(DRV_NAME);
1470MODULE_VERSION(DRV_VERSION);
1471
