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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
40#define DRV_NAME "vrf"
41#define DRV_VERSION "1.0"
42
43#define FIB_RULE_PREF 1000
44static bool add_fib_rules = true;
45
46struct net_vrf {
47 struct rtable __rcu *rth;
48 struct rtable __rcu *rth_local;
49 struct rt6_info __rcu *rt6;
50 struct rt6_info __rcu *rt6_local;
51 u32 tb_id;
52};
53
54struct 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
64static 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
74static 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
80static struct rtnl_link_stats64 *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 return stats;
106}
107
108
109
110
111static int vrf_local_xmit(struct sk_buff *skb, struct net_device *dev,
112 struct dst_entry *dst)
113{
114 int len = skb->len;
115
116 skb_orphan(skb);
117
118 skb_dst_set(skb, dst);
119 skb_dst_force(skb);
120
121
122
123
124 skb->pkt_type = PACKET_LOOPBACK;
125
126 skb->protocol = eth_type_trans(skb, dev);
127
128 if (likely(netif_rx(skb) == NET_RX_SUCCESS))
129 vrf_rx_stats(dev, len);
130 else
131 this_cpu_inc(dev->dstats->rx_drps);
132
133 return NETDEV_TX_OK;
134}
135
136#if IS_ENABLED(CONFIG_IPV6)
137static int vrf_ip6_local_out(struct net *net, struct sock *sk,
138 struct sk_buff *skb)
139{
140 int err;
141
142 err = nf_hook(NFPROTO_IPV6, NF_INET_LOCAL_OUT, net,
143 sk, skb, NULL, skb_dst(skb)->dev, dst_output);
144
145 if (likely(err == 1))
146 err = dst_output(net, sk, skb);
147
148 return err;
149}
150
151static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb,
152 struct net_device *dev)
153{
154 const struct ipv6hdr *iph = ipv6_hdr(skb);
155 struct net *net = dev_net(skb->dev);
156 struct flowi6 fl6 = {
157
158 .flowi6_oif = dev->ifindex,
159 .flowi6_iif = LOOPBACK_IFINDEX,
160 .daddr = iph->daddr,
161 .saddr = iph->saddr,
162 .flowlabel = ip6_flowinfo(iph),
163 .flowi6_mark = skb->mark,
164 .flowi6_proto = iph->nexthdr,
165 .flowi6_flags = FLOWI_FLAG_SKIP_NH_OIF,
166 };
167 int ret = NET_XMIT_DROP;
168 struct dst_entry *dst;
169 struct dst_entry *dst_null = &net->ipv6.ip6_null_entry->dst;
170
171 dst = ip6_route_output(net, NULL, &fl6);
172 if (dst == dst_null)
173 goto err;
174
175 skb_dst_drop(skb);
176
177
178
179
180
181 if (dst->dev == net->loopback_dev || dst->dev == dev) {
182 struct net_vrf *vrf = netdev_priv(dev);
183 struct rt6_info *rt6_local;
184
185
186 dst_release(dst);
187
188 rcu_read_lock();
189
190 rt6_local = rcu_dereference(vrf->rt6_local);
191 if (unlikely(!rt6_local)) {
192 rcu_read_unlock();
193 goto err;
194 }
195
196
197
198
199
200 if (unlikely(!rt6_local->rt6i_idev)) {
201 rt6_local->rt6i_idev = in6_dev_get(dev);
202 if (!rt6_local->rt6i_idev) {
203 rcu_read_unlock();
204 goto err;
205 }
206 }
207
208 dst = &rt6_local->dst;
209 dst_hold(dst);
210
211 rcu_read_unlock();
212
213 return vrf_local_xmit(skb, dev, &rt6_local->dst);
214 }
215
216 skb_dst_set(skb, dst);
217
218
219 __skb_pull(skb, skb_network_offset(skb));
220
221 ret = vrf_ip6_local_out(net, skb->sk, skb);
222 if (unlikely(net_xmit_eval(ret)))
223 dev->stats.tx_errors++;
224 else
225 ret = NET_XMIT_SUCCESS;
226
227 return ret;
228err:
229 vrf_tx_error(dev, skb);
230 return NET_XMIT_DROP;
231}
232#else
233static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb,
234 struct net_device *dev)
235{
236 vrf_tx_error(dev, skb);
237 return NET_XMIT_DROP;
238}
239#endif
240
241
242static int vrf_ip_local_out(struct net *net, struct sock *sk,
243 struct sk_buff *skb)
244{
245 int err;
246
247 err = nf_hook(NFPROTO_IPV4, NF_INET_LOCAL_OUT, net, sk,
248 skb, NULL, skb_dst(skb)->dev, dst_output);
249 if (likely(err == 1))
250 err = dst_output(net, sk, skb);
251
252 return err;
253}
254
255static netdev_tx_t vrf_process_v4_outbound(struct sk_buff *skb,
256 struct net_device *vrf_dev)
257{
258 struct iphdr *ip4h = ip_hdr(skb);
259 int ret = NET_XMIT_DROP;
260 struct flowi4 fl4 = {
261
262 .flowi4_oif = vrf_dev->ifindex,
263 .flowi4_iif = LOOPBACK_IFINDEX,
264 .flowi4_tos = RT_TOS(ip4h->tos),
265 .flowi4_flags = FLOWI_FLAG_ANYSRC | FLOWI_FLAG_SKIP_NH_OIF,
266 .daddr = ip4h->daddr,
267 };
268 struct net *net = dev_net(vrf_dev);
269 struct rtable *rt;
270
271 rt = ip_route_output_flow(net, &fl4, NULL);
272 if (IS_ERR(rt))
273 goto err;
274
275 if (rt->rt_type != RTN_UNICAST && rt->rt_type != RTN_LOCAL) {
276 ip_rt_put(rt);
277 goto err;
278 }
279
280 skb_dst_drop(skb);
281
282
283
284
285
286 if (rt->dst.dev == net->loopback_dev || rt->dst.dev == vrf_dev) {
287 struct net_vrf *vrf = netdev_priv(vrf_dev);
288 struct rtable *rth_local;
289 struct dst_entry *dst = NULL;
290
291 ip_rt_put(rt);
292
293 rcu_read_lock();
294
295 rth_local = rcu_dereference(vrf->rth_local);
296 if (likely(rth_local)) {
297 dst = &rth_local->dst;
298 dst_hold(dst);
299 }
300
301 rcu_read_unlock();
302
303 if (unlikely(!dst))
304 goto err;
305
306 return vrf_local_xmit(skb, vrf_dev, dst);
307 }
308
309 skb_dst_set(skb, &rt->dst);
310
311
312 __skb_pull(skb, skb_network_offset(skb));
313
314 if (!ip4h->saddr) {
315 ip4h->saddr = inet_select_addr(skb_dst(skb)->dev, 0,
316 RT_SCOPE_LINK);
317 }
318
319 ret = vrf_ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb);
320 if (unlikely(net_xmit_eval(ret)))
321 vrf_dev->stats.tx_errors++;
322 else
323 ret = NET_XMIT_SUCCESS;
324
325out:
326 return ret;
327err:
328 vrf_tx_error(vrf_dev, skb);
329 goto out;
330}
331
332static netdev_tx_t is_ip_tx_frame(struct sk_buff *skb, struct net_device *dev)
333{
334 switch (skb->protocol) {
335 case htons(ETH_P_IP):
336 return vrf_process_v4_outbound(skb, dev);
337 case htons(ETH_P_IPV6):
338 return vrf_process_v6_outbound(skb, dev);
339 default:
340 vrf_tx_error(dev, skb);
341 return NET_XMIT_DROP;
342 }
343}
344
345static netdev_tx_t vrf_xmit(struct sk_buff *skb, struct net_device *dev)
346{
347 netdev_tx_t ret = is_ip_tx_frame(skb, dev);
348
349 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
350 struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats);
351
352 u64_stats_update_begin(&dstats->syncp);
353 dstats->tx_pkts++;
354 dstats->tx_bytes += skb->len;
355 u64_stats_update_end(&dstats->syncp);
356 } else {
357 this_cpu_inc(dev->dstats->tx_drps);
358 }
359
360 return ret;
361}
362
363#if IS_ENABLED(CONFIG_IPV6)
364
365static int vrf_finish_output6(struct net *net, struct sock *sk,
366 struct sk_buff *skb)
367{
368 struct dst_entry *dst = skb_dst(skb);
369 struct net_device *dev = dst->dev;
370 struct neighbour *neigh;
371 struct in6_addr *nexthop;
372 int ret;
373
374 skb->protocol = htons(ETH_P_IPV6);
375 skb->dev = dev;
376
377 rcu_read_lock_bh();
378 nexthop = rt6_nexthop((struct rt6_info *)dst, &ipv6_hdr(skb)->daddr);
379 neigh = __ipv6_neigh_lookup_noref(dst->dev, nexthop);
380 if (unlikely(!neigh))
381 neigh = __neigh_create(&nd_tbl, nexthop, dst->dev, false);
382 if (!IS_ERR(neigh)) {
383 ret = dst_neigh_output(dst, neigh, skb);
384 rcu_read_unlock_bh();
385 return ret;
386 }
387 rcu_read_unlock_bh();
388
389 IP6_INC_STATS(dev_net(dst->dev),
390 ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES);
391 kfree_skb(skb);
392 return -EINVAL;
393}
394
395
396static int vrf_output6(struct net *net, struct sock *sk, struct sk_buff *skb)
397{
398 return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING,
399 net, sk, skb, NULL, skb_dst(skb)->dev,
400 vrf_finish_output6,
401 !(IP6CB(skb)->flags & IP6SKB_REROUTED));
402}
403
404
405
406
407
408static struct sk_buff *vrf_ip6_out(struct net_device *vrf_dev,
409 struct sock *sk,
410 struct sk_buff *skb)
411{
412 struct net_vrf *vrf = netdev_priv(vrf_dev);
413 struct dst_entry *dst = NULL;
414 struct rt6_info *rt6;
415
416
417 if (rt6_need_strict(&ipv6_hdr(skb)->daddr))
418 return skb;
419
420 rcu_read_lock();
421
422 rt6 = rcu_dereference(vrf->rt6);
423 if (likely(rt6)) {
424 dst = &rt6->dst;
425 dst_hold(dst);
426 }
427
428 rcu_read_unlock();
429
430 if (unlikely(!dst)) {
431 vrf_tx_error(vrf_dev, skb);
432 return NULL;
433 }
434
435 skb_dst_drop(skb);
436 skb_dst_set(skb, dst);
437
438 return skb;
439}
440
441
442static void vrf_rt6_release(struct net_device *dev, struct net_vrf *vrf)
443{
444 struct rt6_info *rt6 = rtnl_dereference(vrf->rt6);
445 struct rt6_info *rt6_local = rtnl_dereference(vrf->rt6_local);
446 struct net *net = dev_net(dev);
447 struct dst_entry *dst;
448
449 RCU_INIT_POINTER(vrf->rt6, NULL);
450 RCU_INIT_POINTER(vrf->rt6_local, NULL);
451 synchronize_rcu();
452
453
454
455
456 if (rt6) {
457 dst = &rt6->dst;
458 dev_put(dst->dev);
459 dst->dev = net->loopback_dev;
460 dev_hold(dst->dev);
461 dst_release(dst);
462 }
463
464 if (rt6_local) {
465 if (rt6_local->rt6i_idev)
466 in6_dev_put(rt6_local->rt6i_idev);
467
468 dst = &rt6_local->dst;
469 dev_put(dst->dev);
470 dst->dev = net->loopback_dev;
471 dev_hold(dst->dev);
472 dst_release(dst);
473 }
474}
475
476static int vrf_rt6_create(struct net_device *dev)
477{
478 int flags = DST_HOST | DST_NOPOLICY | DST_NOXFRM | DST_NOCACHE;
479 struct net_vrf *vrf = netdev_priv(dev);
480 struct net *net = dev_net(dev);
481 struct fib6_table *rt6i_table;
482 struct rt6_info *rt6, *rt6_local;
483 int rc = -ENOMEM;
484
485
486 if (!ipv6_mod_enabled())
487 return 0;
488
489 rt6i_table = fib6_new_table(net, vrf->tb_id);
490 if (!rt6i_table)
491 goto out;
492
493
494 rt6 = ip6_dst_alloc(net, dev, flags);
495 if (!rt6)
496 goto out;
497
498 dst_hold(&rt6->dst);
499
500 rt6->rt6i_table = rt6i_table;
501 rt6->dst.output = vrf_output6;
502
503
504
505
506 rt6_local = ip6_dst_alloc(net, dev, flags);
507 if (!rt6_local) {
508 dst_release(&rt6->dst);
509 goto out;
510 }
511
512 dst_hold(&rt6_local->dst);
513
514 rt6_local->rt6i_idev = in6_dev_get(dev);
515 rt6_local->rt6i_flags = RTF_UP | RTF_NONEXTHOP | RTF_LOCAL;
516 rt6_local->rt6i_table = rt6i_table;
517 rt6_local->dst.input = ip6_input;
518
519 rcu_assign_pointer(vrf->rt6, rt6);
520 rcu_assign_pointer(vrf->rt6_local, rt6_local);
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
556 if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) {
557 struct sk_buff *skb2;
558
559 skb2 = skb_realloc_headroom(skb, LL_RESERVED_SPACE(dev));
560 if (!skb2) {
561 ret = -ENOMEM;
562 goto err;
563 }
564 if (skb->sk)
565 skb_set_owner_w(skb2, skb->sk);
566
567 consume_skb(skb);
568 skb = skb2;
569 }
570
571 rcu_read_lock_bh();
572
573 nexthop = (__force u32)rt_nexthop(rt, ip_hdr(skb)->daddr);
574 neigh = __ipv4_neigh_lookup_noref(dev, nexthop);
575 if (unlikely(!neigh))
576 neigh = __neigh_create(&arp_tbl, &nexthop, dev, false);
577 if (!IS_ERR(neigh))
578 ret = dst_neigh_output(dst, neigh, skb);
579
580 rcu_read_unlock_bh();
581err:
582 if (unlikely(ret < 0))
583 vrf_tx_error(skb->dev, skb);
584 return ret;
585}
586
587static int vrf_output(struct net *net, struct sock *sk, struct sk_buff *skb)
588{
589 struct net_device *dev = skb_dst(skb)->dev;
590
591 IP_UPD_PO_STATS(net, IPSTATS_MIB_OUT, skb->len);
592
593 skb->dev = dev;
594 skb->protocol = htons(ETH_P_IP);
595
596 return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING,
597 net, sk, skb, NULL, dev,
598 vrf_finish_output,
599 !(IPCB(skb)->flags & IPSKB_REROUTED));
600}
601
602
603
604
605
606static struct sk_buff *vrf_ip_out(struct net_device *vrf_dev,
607 struct sock *sk,
608 struct sk_buff *skb)
609{
610 struct net_vrf *vrf = netdev_priv(vrf_dev);
611 struct dst_entry *dst = NULL;
612 struct rtable *rth;
613
614 rcu_read_lock();
615
616 rth = rcu_dereference(vrf->rth);
617 if (likely(rth)) {
618 dst = &rth->dst;
619 dst_hold(dst);
620 }
621
622 rcu_read_unlock();
623
624 if (unlikely(!dst)) {
625 vrf_tx_error(vrf_dev, skb);
626 return NULL;
627 }
628
629 skb_dst_drop(skb);
630 skb_dst_set(skb, dst);
631
632 return skb;
633}
634
635
636static struct sk_buff *vrf_l3_out(struct net_device *vrf_dev,
637 struct sock *sk,
638 struct sk_buff *skb,
639 u16 proto)
640{
641 switch (proto) {
642 case AF_INET:
643 return vrf_ip_out(vrf_dev, sk, skb);
644 case AF_INET6:
645 return vrf_ip6_out(vrf_dev, sk, skb);
646 }
647
648 return skb;
649}
650
651
652static void vrf_rtable_release(struct net_device *dev, struct net_vrf *vrf)
653{
654 struct rtable *rth = rtnl_dereference(vrf->rth);
655 struct rtable *rth_local = rtnl_dereference(vrf->rth_local);
656 struct net *net = dev_net(dev);
657 struct dst_entry *dst;
658
659 RCU_INIT_POINTER(vrf->rth, NULL);
660 RCU_INIT_POINTER(vrf->rth_local, NULL);
661 synchronize_rcu();
662
663
664
665
666 if (rth) {
667 dst = &rth->dst;
668 dev_put(dst->dev);
669 dst->dev = net->loopback_dev;
670 dev_hold(dst->dev);
671 dst_release(dst);
672 }
673
674 if (rth_local) {
675 dst = &rth_local->dst;
676 dev_put(dst->dev);
677 dst->dev = net->loopback_dev;
678 dev_hold(dst->dev);
679 dst_release(dst);
680 }
681}
682
683static int vrf_rtable_create(struct net_device *dev)
684{
685 struct net_vrf *vrf = netdev_priv(dev);
686 struct rtable *rth, *rth_local;
687
688 if (!fib_new_table(dev_net(dev), vrf->tb_id))
689 return -ENOMEM;
690
691
692 rth = rt_dst_alloc(dev, 0, RTN_UNICAST, 1, 1, 0);
693 if (!rth)
694 return -ENOMEM;
695
696
697
698
699 rth_local = rt_dst_alloc(dev, RTCF_LOCAL, RTN_LOCAL, 1, 1, 0);
700 if (!rth_local) {
701 dst_release(&rth->dst);
702 return -ENOMEM;
703 }
704
705 rth->dst.output = vrf_output;
706 rth->rt_table_id = vrf->tb_id;
707
708 rth_local->rt_table_id = vrf->tb_id;
709
710 rcu_assign_pointer(vrf->rth, rth);
711 rcu_assign_pointer(vrf->rth_local, rth_local);
712
713 return 0;
714}
715
716
717
718
719static void cycle_netdev(struct net_device *dev)
720{
721 unsigned int flags = dev->flags;
722 int ret;
723
724 if (!netif_running(dev))
725 return;
726
727 ret = dev_change_flags(dev, flags & ~IFF_UP);
728 if (ret >= 0)
729 ret = dev_change_flags(dev, flags);
730
731 if (ret < 0) {
732 netdev_err(dev,
733 "Failed to cycle device %s; route tables might be wrong!\n",
734 dev->name);
735 }
736}
737
738static int do_vrf_add_slave(struct net_device *dev, struct net_device *port_dev)
739{
740 int ret;
741
742 ret = netdev_master_upper_dev_link(port_dev, dev, NULL, NULL);
743 if (ret < 0)
744 return ret;
745
746 port_dev->priv_flags |= IFF_L3MDEV_SLAVE;
747 cycle_netdev(port_dev);
748
749 return 0;
750}
751
752static int vrf_add_slave(struct net_device *dev, struct net_device *port_dev)
753{
754 if (netif_is_l3_master(port_dev) || netif_is_l3_slave(port_dev))
755 return -EINVAL;
756
757 return do_vrf_add_slave(dev, port_dev);
758}
759
760
761static int do_vrf_del_slave(struct net_device *dev, struct net_device *port_dev)
762{
763 netdev_upper_dev_unlink(port_dev, dev);
764 port_dev->priv_flags &= ~IFF_L3MDEV_SLAVE;
765
766 cycle_netdev(port_dev);
767
768 return 0;
769}
770
771static int vrf_del_slave(struct net_device *dev, struct net_device *port_dev)
772{
773 return do_vrf_del_slave(dev, port_dev);
774}
775
776static void vrf_dev_uninit(struct net_device *dev)
777{
778 struct net_vrf *vrf = netdev_priv(dev);
779 struct net_device *port_dev;
780 struct list_head *iter;
781
782 vrf_rtable_release(dev, vrf);
783 vrf_rt6_release(dev, vrf);
784
785 netdev_for_each_lower_dev(dev, port_dev, iter)
786 vrf_del_slave(dev, port_dev);
787
788 free_percpu(dev->dstats);
789 dev->dstats = NULL;
790}
791
792static int vrf_dev_init(struct net_device *dev)
793{
794 struct net_vrf *vrf = netdev_priv(dev);
795
796 dev->dstats = netdev_alloc_pcpu_stats(struct pcpu_dstats);
797 if (!dev->dstats)
798 goto out_nomem;
799
800
801 if (vrf_rtable_create(dev) != 0)
802 goto out_stats;
803
804 if (vrf_rt6_create(dev) != 0)
805 goto out_rth;
806
807 dev->flags = IFF_MASTER | IFF_NOARP;
808
809
810 dev->mtu = 64 * 1024;
811
812
813 dev->operstate = IF_OPER_UP;
814 netdev_lockdep_set_classes(dev);
815 return 0;
816
817out_rth:
818 vrf_rtable_release(dev, vrf);
819out_stats:
820 free_percpu(dev->dstats);
821 dev->dstats = NULL;
822out_nomem:
823 return -ENOMEM;
824}
825
826static const struct net_device_ops vrf_netdev_ops = {
827 .ndo_init = vrf_dev_init,
828 .ndo_uninit = vrf_dev_uninit,
829 .ndo_start_xmit = vrf_xmit,
830 .ndo_get_stats64 = vrf_get_stats64,
831 .ndo_add_slave = vrf_add_slave,
832 .ndo_del_slave = vrf_del_slave,
833};
834
835static u32 vrf_fib_table(const struct net_device *dev)
836{
837 struct net_vrf *vrf = netdev_priv(dev);
838
839 return vrf->tb_id;
840}
841
842static int vrf_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb)
843{
844 return 0;
845}
846
847static struct sk_buff *vrf_rcv_nfhook(u8 pf, unsigned int hook,
848 struct sk_buff *skb,
849 struct net_device *dev)
850{
851 struct net *net = dev_net(dev);
852
853 nf_reset(skb);
854
855 if (NF_HOOK(pf, hook, net, NULL, skb, dev, NULL, vrf_rcv_finish) < 0)
856 skb = NULL;
857
858 return skb;
859}
860
861#if IS_ENABLED(CONFIG_IPV6)
862
863
864
865
866
867static bool ipv6_ndisc_frame(const struct sk_buff *skb)
868{
869 const struct ipv6hdr *iph = ipv6_hdr(skb);
870 bool rc = false;
871
872 if (iph->nexthdr == NEXTHDR_ICMP) {
873 const struct icmp6hdr *icmph;
874 struct icmp6hdr _icmph;
875
876 icmph = skb_header_pointer(skb, sizeof(*iph),
877 sizeof(_icmph), &_icmph);
878 if (!icmph)
879 goto out;
880
881 switch (icmph->icmp6_type) {
882 case NDISC_ROUTER_SOLICITATION:
883 case NDISC_ROUTER_ADVERTISEMENT:
884 case NDISC_NEIGHBOUR_SOLICITATION:
885 case NDISC_NEIGHBOUR_ADVERTISEMENT:
886 case NDISC_REDIRECT:
887 rc = true;
888 break;
889 }
890 }
891
892out:
893 return rc;
894}
895
896static struct rt6_info *vrf_ip6_route_lookup(struct net *net,
897 const struct net_device *dev,
898 struct flowi6 *fl6,
899 int ifindex,
900 int flags)
901{
902 struct net_vrf *vrf = netdev_priv(dev);
903 struct fib6_table *table = NULL;
904 struct rt6_info *rt6;
905
906 rcu_read_lock();
907
908
909 rt6 = rcu_dereference(vrf->rt6);
910 if (likely(rt6))
911 table = rt6->rt6i_table;
912
913 rcu_read_unlock();
914
915 if (!table)
916 return NULL;
917
918 return ip6_pol_route(net, table, ifindex, fl6, flags);
919}
920
921static void vrf_ip6_input_dst(struct sk_buff *skb, struct net_device *vrf_dev,
922 int ifindex)
923{
924 const struct ipv6hdr *iph = ipv6_hdr(skb);
925 struct flowi6 fl6 = {
926 .daddr = iph->daddr,
927 .saddr = iph->saddr,
928 .flowlabel = ip6_flowinfo(iph),
929 .flowi6_mark = skb->mark,
930 .flowi6_proto = iph->nexthdr,
931 .flowi6_iif = ifindex,
932 };
933 struct net *net = dev_net(vrf_dev);
934 struct rt6_info *rt6;
935
936 rt6 = vrf_ip6_route_lookup(net, vrf_dev, &fl6, ifindex,
937 RT6_LOOKUP_F_HAS_SADDR | RT6_LOOKUP_F_IFACE);
938 if (unlikely(!rt6))
939 return;
940
941 if (unlikely(&rt6->dst == &net->ipv6.ip6_null_entry->dst))
942 return;
943
944 skb_dst_set(skb, &rt6->dst);
945}
946
947static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev,
948 struct sk_buff *skb)
949{
950 int orig_iif = skb->skb_iif;
951 bool need_strict;
952
953
954
955
956 if (skb->pkt_type == PACKET_LOOPBACK) {
957 skb->dev = vrf_dev;
958 skb->skb_iif = vrf_dev->ifindex;
959 IP6CB(skb)->flags |= IP6SKB_L3SLAVE;
960 skb->pkt_type = PACKET_HOST;
961 goto out;
962 }
963
964
965
966
967 need_strict = rt6_need_strict(&ipv6_hdr(skb)->daddr);
968 if (!ipv6_ndisc_frame(skb) && !need_strict) {
969 skb->dev = vrf_dev;
970 skb->skb_iif = vrf_dev->ifindex;
971
972 skb_push(skb, skb->mac_len);
973 dev_queue_xmit_nit(skb, vrf_dev);
974 skb_pull(skb, skb->mac_len);
975
976 IP6CB(skb)->flags |= IP6SKB_L3SLAVE;
977 }
978
979 if (need_strict)
980 vrf_ip6_input_dst(skb, vrf_dev, orig_iif);
981
982 skb = vrf_rcv_nfhook(NFPROTO_IPV6, NF_INET_PRE_ROUTING, skb, vrf_dev);
983out:
984 return skb;
985}
986
987#else
988static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev,
989 struct sk_buff *skb)
990{
991 return skb;
992}
993#endif
994
995static struct sk_buff *vrf_ip_rcv(struct net_device *vrf_dev,
996 struct sk_buff *skb)
997{
998 skb->dev = vrf_dev;
999 skb->skb_iif = vrf_dev->ifindex;
1000 IPCB(skb)->flags |= IPSKB_L3SLAVE;
1001
1002
1003
1004
1005 if (skb->pkt_type == PACKET_LOOPBACK) {
1006 skb->pkt_type = PACKET_HOST;
1007 goto out;
1008 }
1009
1010 skb_push(skb, skb->mac_len);
1011 dev_queue_xmit_nit(skb, vrf_dev);
1012 skb_pull(skb, skb->mac_len);
1013
1014 skb = vrf_rcv_nfhook(NFPROTO_IPV4, NF_INET_PRE_ROUTING, skb, vrf_dev);
1015out:
1016 return skb;
1017}
1018
1019
1020static struct sk_buff *vrf_l3_rcv(struct net_device *vrf_dev,
1021 struct sk_buff *skb,
1022 u16 proto)
1023{
1024 switch (proto) {
1025 case AF_INET:
1026 return vrf_ip_rcv(vrf_dev, skb);
1027 case AF_INET6:
1028 return vrf_ip6_rcv(vrf_dev, skb);
1029 }
1030
1031 return skb;
1032}
1033
1034#if IS_ENABLED(CONFIG_IPV6)
1035
1036
1037
1038static struct dst_entry *vrf_link_scope_lookup(const struct net_device *dev,
1039 struct flowi6 *fl6)
1040{
1041 struct net *net = dev_net(dev);
1042 int flags = RT6_LOOKUP_F_IFACE;
1043 struct dst_entry *dst = NULL;
1044 struct rt6_info *rt;
1045
1046
1047
1048
1049
1050 if (fl6->flowi6_oif == dev->ifindex) {
1051 dst = &net->ipv6.ip6_null_entry->dst;
1052 dst_hold(dst);
1053 return dst;
1054 }
1055
1056 if (!ipv6_addr_any(&fl6->saddr))
1057 flags |= RT6_LOOKUP_F_HAS_SADDR;
1058
1059 rt = vrf_ip6_route_lookup(net, dev, fl6, fl6->flowi6_oif, flags);
1060 if (rt)
1061 dst = &rt->dst;
1062
1063 return dst;
1064}
1065#endif
1066
1067static const struct l3mdev_ops vrf_l3mdev_ops = {
1068 .l3mdev_fib_table = vrf_fib_table,
1069 .l3mdev_l3_rcv = vrf_l3_rcv,
1070 .l3mdev_l3_out = vrf_l3_out,
1071#if IS_ENABLED(CONFIG_IPV6)
1072 .l3mdev_link_scope_lookup = vrf_link_scope_lookup,
1073#endif
1074};
1075
1076static void vrf_get_drvinfo(struct net_device *dev,
1077 struct ethtool_drvinfo *info)
1078{
1079 strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
1080 strlcpy(info->version, DRV_VERSION, sizeof(info->version));
1081}
1082
1083static const struct ethtool_ops vrf_ethtool_ops = {
1084 .get_drvinfo = vrf_get_drvinfo,
1085};
1086
1087static inline size_t vrf_fib_rule_nl_size(void)
1088{
1089 size_t sz;
1090
1091 sz = NLMSG_ALIGN(sizeof(struct fib_rule_hdr));
1092 sz += nla_total_size(sizeof(u8));
1093 sz += nla_total_size(sizeof(u32));
1094
1095 return sz;
1096}
1097
1098static int vrf_fib_rule(const struct net_device *dev, __u8 family, bool add_it)
1099{
1100 struct fib_rule_hdr *frh;
1101 struct nlmsghdr *nlh;
1102 struct sk_buff *skb;
1103 int err;
1104
1105 if (family == AF_INET6 && !ipv6_mod_enabled())
1106 return 0;
1107
1108 skb = nlmsg_new(vrf_fib_rule_nl_size(), GFP_KERNEL);
1109 if (!skb)
1110 return -ENOMEM;
1111
1112 nlh = nlmsg_put(skb, 0, 0, 0, sizeof(*frh), 0);
1113 if (!nlh)
1114 goto nla_put_failure;
1115
1116
1117 nlh->nlmsg_flags &= NLM_F_EXCL;
1118
1119 frh = nlmsg_data(nlh);
1120 memset(frh, 0, sizeof(*frh));
1121 frh->family = family;
1122 frh->action = FR_ACT_TO_TBL;
1123
1124 if (nla_put_u32(skb, FRA_L3MDEV, 1))
1125 goto nla_put_failure;
1126
1127 if (nla_put_u32(skb, FRA_PRIORITY, FIB_RULE_PREF))
1128 goto nla_put_failure;
1129
1130 nlmsg_end(skb, nlh);
1131
1132
1133 skb->sk = dev_net(dev)->rtnl;
1134 if (add_it) {
1135 err = fib_nl_newrule(skb, nlh);
1136 if (err == -EEXIST)
1137 err = 0;
1138 } else {
1139 err = fib_nl_delrule(skb, nlh);
1140 if (err == -ENOENT)
1141 err = 0;
1142 }
1143 nlmsg_free(skb);
1144
1145 return err;
1146
1147nla_put_failure:
1148 nlmsg_free(skb);
1149
1150 return -EMSGSIZE;
1151}
1152
1153static int vrf_add_fib_rules(const struct net_device *dev)
1154{
1155 int err;
1156
1157 err = vrf_fib_rule(dev, AF_INET, true);
1158 if (err < 0)
1159 goto out_err;
1160
1161 err = vrf_fib_rule(dev, AF_INET6, true);
1162 if (err < 0)
1163 goto ipv6_err;
1164
1165 return 0;
1166
1167ipv6_err:
1168 vrf_fib_rule(dev, AF_INET, false);
1169
1170out_err:
1171 netdev_err(dev, "Failed to add FIB rules.\n");
1172 return err;
1173}
1174
1175static void vrf_setup(struct net_device *dev)
1176{
1177 ether_setup(dev);
1178
1179
1180 dev->netdev_ops = &vrf_netdev_ops;
1181 dev->l3mdev_ops = &vrf_l3mdev_ops;
1182 dev->ethtool_ops = &vrf_ethtool_ops;
1183 dev->destructor = free_netdev;
1184
1185
1186 eth_hw_addr_random(dev);
1187
1188
1189 dev->features |= NETIF_F_LLTX;
1190
1191
1192 dev->features |= NETIF_F_NETNS_LOCAL;
1193
1194
1195 dev->features |= NETIF_F_VLAN_CHALLENGED;
1196
1197
1198 dev->features |= NETIF_F_GSO_SOFTWARE;
1199 dev->features |= NETIF_F_RXCSUM | NETIF_F_HW_CSUM;
1200 dev->features |= NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA;
1201
1202 dev->hw_features = dev->features;
1203 dev->hw_enc_features = dev->features;
1204
1205
1206 dev->priv_flags |= IFF_NO_QUEUE;
1207}
1208
1209static int vrf_validate(struct nlattr *tb[], struct nlattr *data[])
1210{
1211 if (tb[IFLA_ADDRESS]) {
1212 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1213 return -EINVAL;
1214 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1215 return -EADDRNOTAVAIL;
1216 }
1217 return 0;
1218}
1219
1220static void vrf_dellink(struct net_device *dev, struct list_head *head)
1221{
1222 unregister_netdevice_queue(dev, head);
1223}
1224
1225static int vrf_newlink(struct net *src_net, struct net_device *dev,
1226 struct nlattr *tb[], struct nlattr *data[])
1227{
1228 struct net_vrf *vrf = netdev_priv(dev);
1229 int err;
1230
1231 if (!data || !data[IFLA_VRF_TABLE])
1232 return -EINVAL;
1233
1234 vrf->tb_id = nla_get_u32(data[IFLA_VRF_TABLE]);
1235
1236 dev->priv_flags |= IFF_L3MDEV_MASTER;
1237
1238 err = register_netdevice(dev);
1239 if (err)
1240 goto out;
1241
1242 if (add_fib_rules) {
1243 err = vrf_add_fib_rules(dev);
1244 if (err) {
1245 unregister_netdevice(dev);
1246 goto out;
1247 }
1248 add_fib_rules = false;
1249 }
1250
1251out:
1252 return err;
1253}
1254
1255static size_t vrf_nl_getsize(const struct net_device *dev)
1256{
1257 return nla_total_size(sizeof(u32));
1258}
1259
1260static int vrf_fillinfo(struct sk_buff *skb,
1261 const struct net_device *dev)
1262{
1263 struct net_vrf *vrf = netdev_priv(dev);
1264
1265 return nla_put_u32(skb, IFLA_VRF_TABLE, vrf->tb_id);
1266}
1267
1268static size_t vrf_get_slave_size(const struct net_device *bond_dev,
1269 const struct net_device *slave_dev)
1270{
1271 return nla_total_size(sizeof(u32));
1272}
1273
1274static int vrf_fill_slave_info(struct sk_buff *skb,
1275 const struct net_device *vrf_dev,
1276 const struct net_device *slave_dev)
1277{
1278 struct net_vrf *vrf = netdev_priv(vrf_dev);
1279
1280 if (nla_put_u32(skb, IFLA_VRF_PORT_TABLE, vrf->tb_id))
1281 return -EMSGSIZE;
1282
1283 return 0;
1284}
1285
1286static const struct nla_policy vrf_nl_policy[IFLA_VRF_MAX + 1] = {
1287 [IFLA_VRF_TABLE] = { .type = NLA_U32 },
1288};
1289
1290static struct rtnl_link_ops vrf_link_ops __read_mostly = {
1291 .kind = DRV_NAME,
1292 .priv_size = sizeof(struct net_vrf),
1293
1294 .get_size = vrf_nl_getsize,
1295 .policy = vrf_nl_policy,
1296 .validate = vrf_validate,
1297 .fill_info = vrf_fillinfo,
1298
1299 .get_slave_size = vrf_get_slave_size,
1300 .fill_slave_info = vrf_fill_slave_info,
1301
1302 .newlink = vrf_newlink,
1303 .dellink = vrf_dellink,
1304 .setup = vrf_setup,
1305 .maxtype = IFLA_VRF_MAX,
1306};
1307
1308static int vrf_device_event(struct notifier_block *unused,
1309 unsigned long event, void *ptr)
1310{
1311 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1312
1313
1314 if (event == NETDEV_UNREGISTER) {
1315 struct net_device *vrf_dev;
1316
1317 if (!netif_is_l3_slave(dev))
1318 goto out;
1319
1320 vrf_dev = netdev_master_upper_dev_get(dev);
1321 vrf_del_slave(vrf_dev, dev);
1322 }
1323out:
1324 return NOTIFY_DONE;
1325}
1326
1327static struct notifier_block vrf_notifier_block __read_mostly = {
1328 .notifier_call = vrf_device_event,
1329};
1330
1331static int __init vrf_init_module(void)
1332{
1333 int rc;
1334
1335 register_netdevice_notifier(&vrf_notifier_block);
1336
1337 rc = rtnl_link_register(&vrf_link_ops);
1338 if (rc < 0)
1339 goto error;
1340
1341 return 0;
1342
1343error:
1344 unregister_netdevice_notifier(&vrf_notifier_block);
1345 return rc;
1346}
1347
1348module_init(vrf_init_module);
1349MODULE_AUTHOR("Shrijeet Mukherjee, David Ahern");
1350MODULE_DESCRIPTION("Device driver to instantiate VRF domains");
1351MODULE_LICENSE("GPL");
1352MODULE_ALIAS_RTNL_LINK(DRV_NAME);
1353MODULE_VERSION(DRV_VERSION);
1354