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Merge branch 'parisc-4.6-2' of git://git.kernel.org/pub/scm/linux/kernel/git/deller...
[deliverable/linux.git] / drivers / net / vrf.c
1 /*
2 * vrf.c: device driver to encapsulate a VRF space
3 *
4 * Copyright (c) 2015 Cumulus Networks. All rights reserved.
5 * Copyright (c) 2015 Shrijeet Mukherjee <shm@cumulusnetworks.com>
6 * Copyright (c) 2015 David Ahern <dsa@cumulusnetworks.com>
7 *
8 * Based on dummy, team and ipvlan drivers
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 */
15
16 #include <linux/module.h>
17 #include <linux/kernel.h>
18 #include <linux/netdevice.h>
19 #include <linux/etherdevice.h>
20 #include <linux/ip.h>
21 #include <linux/init.h>
22 #include <linux/moduleparam.h>
23 #include <linux/netfilter.h>
24 #include <linux/rtnetlink.h>
25 #include <net/rtnetlink.h>
26 #include <linux/u64_stats_sync.h>
27 #include <linux/hashtable.h>
28
29 #include <linux/inetdevice.h>
30 #include <net/arp.h>
31 #include <net/ip.h>
32 #include <net/ip_fib.h>
33 #include <net/ip6_fib.h>
34 #include <net/ip6_route.h>
35 #include <net/route.h>
36 #include <net/addrconf.h>
37 #include <net/l3mdev.h>
38
39 #define RT_FL_TOS(oldflp4) \
40 ((oldflp4)->flowi4_tos & (IPTOS_RT_MASK | RTO_ONLINK))
41
42 #define DRV_NAME "vrf"
43 #define DRV_VERSION "1.0"
44
45 #define vrf_master_get_rcu(dev) \
46 ((struct net_device *)rcu_dereference(dev->rx_handler_data))
47
48 struct net_vrf {
49 struct rtable *rth;
50 struct rt6_info *rt6;
51 u32 tb_id;
52 };
53
54 struct pcpu_dstats {
55 u64 tx_pkts;
56 u64 tx_bytes;
57 u64 tx_drps;
58 u64 rx_pkts;
59 u64 rx_bytes;
60 struct u64_stats_sync syncp;
61 };
62
63 static struct dst_entry *vrf_ip_check(struct dst_entry *dst, u32 cookie)
64 {
65 return dst;
66 }
67
68 static int vrf_ip_local_out(struct net *net, struct sock *sk, struct sk_buff *skb)
69 {
70 return ip_local_out(net, sk, skb);
71 }
72
73 static unsigned int vrf_v4_mtu(const struct dst_entry *dst)
74 {
75 /* TO-DO: return max ethernet size? */
76 return dst->dev->mtu;
77 }
78
79 static void vrf_dst_destroy(struct dst_entry *dst)
80 {
81 /* our dst lives forever - or until the device is closed */
82 }
83
84 static unsigned int vrf_default_advmss(const struct dst_entry *dst)
85 {
86 return 65535 - 40;
87 }
88
89 static struct dst_ops vrf_dst_ops = {
90 .family = AF_INET,
91 .local_out = vrf_ip_local_out,
92 .check = vrf_ip_check,
93 .mtu = vrf_v4_mtu,
94 .destroy = vrf_dst_destroy,
95 .default_advmss = vrf_default_advmss,
96 };
97
98 /* neighbor handling is done with actual device; do not want
99 * to flip skb->dev for those ndisc packets. This really fails
100 * for multiple next protocols (e.g., NEXTHDR_HOP). But it is
101 * a start.
102 */
103 #if IS_ENABLED(CONFIG_IPV6)
104 static bool check_ipv6_frame(const struct sk_buff *skb)
105 {
106 const struct ipv6hdr *ipv6h;
107 struct ipv6hdr _ipv6h;
108 bool rc = true;
109
110 ipv6h = skb_header_pointer(skb, 0, sizeof(_ipv6h), &_ipv6h);
111 if (!ipv6h)
112 goto out;
113
114 if (ipv6h->nexthdr == NEXTHDR_ICMP) {
115 const struct icmp6hdr *icmph;
116 struct icmp6hdr _icmph;
117
118 icmph = skb_header_pointer(skb, sizeof(_ipv6h),
119 sizeof(_icmph), &_icmph);
120 if (!icmph)
121 goto out;
122
123 switch (icmph->icmp6_type) {
124 case NDISC_ROUTER_SOLICITATION:
125 case NDISC_ROUTER_ADVERTISEMENT:
126 case NDISC_NEIGHBOUR_SOLICITATION:
127 case NDISC_NEIGHBOUR_ADVERTISEMENT:
128 case NDISC_REDIRECT:
129 rc = false;
130 break;
131 }
132 }
133
134 out:
135 return rc;
136 }
137 #else
138 static bool check_ipv6_frame(const struct sk_buff *skb)
139 {
140 return false;
141 }
142 #endif
143
144 static bool is_ip_rx_frame(struct sk_buff *skb)
145 {
146 switch (skb->protocol) {
147 case htons(ETH_P_IP):
148 return true;
149 case htons(ETH_P_IPV6):
150 return check_ipv6_frame(skb);
151 }
152 return false;
153 }
154
155 static void vrf_tx_error(struct net_device *vrf_dev, struct sk_buff *skb)
156 {
157 vrf_dev->stats.tx_errors++;
158 kfree_skb(skb);
159 }
160
161 /* note: already called with rcu_read_lock */
162 static rx_handler_result_t vrf_handle_frame(struct sk_buff **pskb)
163 {
164 struct sk_buff *skb = *pskb;
165
166 if (is_ip_rx_frame(skb)) {
167 struct net_device *dev = vrf_master_get_rcu(skb->dev);
168 struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats);
169
170 u64_stats_update_begin(&dstats->syncp);
171 dstats->rx_pkts++;
172 dstats->rx_bytes += skb->len;
173 u64_stats_update_end(&dstats->syncp);
174
175 skb->dev = dev;
176
177 return RX_HANDLER_ANOTHER;
178 }
179 return RX_HANDLER_PASS;
180 }
181
182 static struct rtnl_link_stats64 *vrf_get_stats64(struct net_device *dev,
183 struct rtnl_link_stats64 *stats)
184 {
185 int i;
186
187 for_each_possible_cpu(i) {
188 const struct pcpu_dstats *dstats;
189 u64 tbytes, tpkts, tdrops, rbytes, rpkts;
190 unsigned int start;
191
192 dstats = per_cpu_ptr(dev->dstats, i);
193 do {
194 start = u64_stats_fetch_begin_irq(&dstats->syncp);
195 tbytes = dstats->tx_bytes;
196 tpkts = dstats->tx_pkts;
197 tdrops = dstats->tx_drps;
198 rbytes = dstats->rx_bytes;
199 rpkts = dstats->rx_pkts;
200 } while (u64_stats_fetch_retry_irq(&dstats->syncp, start));
201 stats->tx_bytes += tbytes;
202 stats->tx_packets += tpkts;
203 stats->tx_dropped += tdrops;
204 stats->rx_bytes += rbytes;
205 stats->rx_packets += rpkts;
206 }
207 return stats;
208 }
209
210 #if IS_ENABLED(CONFIG_IPV6)
211 static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb,
212 struct net_device *dev)
213 {
214 const struct ipv6hdr *iph = ipv6_hdr(skb);
215 struct net *net = dev_net(skb->dev);
216 struct flowi6 fl6 = {
217 /* needed to match OIF rule */
218 .flowi6_oif = dev->ifindex,
219 .flowi6_iif = LOOPBACK_IFINDEX,
220 .daddr = iph->daddr,
221 .saddr = iph->saddr,
222 .flowlabel = ip6_flowinfo(iph),
223 .flowi6_mark = skb->mark,
224 .flowi6_proto = iph->nexthdr,
225 .flowi6_flags = FLOWI_FLAG_L3MDEV_SRC | FLOWI_FLAG_SKIP_NH_OIF,
226 };
227 int ret = NET_XMIT_DROP;
228 struct dst_entry *dst;
229 struct dst_entry *dst_null = &net->ipv6.ip6_null_entry->dst;
230
231 dst = ip6_route_output(net, NULL, &fl6);
232 if (dst == dst_null)
233 goto err;
234
235 skb_dst_drop(skb);
236 skb_dst_set(skb, dst);
237
238 ret = ip6_local_out(net, skb->sk, skb);
239 if (unlikely(net_xmit_eval(ret)))
240 dev->stats.tx_errors++;
241 else
242 ret = NET_XMIT_SUCCESS;
243
244 return ret;
245 err:
246 vrf_tx_error(dev, skb);
247 return NET_XMIT_DROP;
248 }
249 #else
250 static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb,
251 struct net_device *dev)
252 {
253 vrf_tx_error(dev, skb);
254 return NET_XMIT_DROP;
255 }
256 #endif
257
258 static int vrf_send_v4_prep(struct sk_buff *skb, struct flowi4 *fl4,
259 struct net_device *vrf_dev)
260 {
261 struct rtable *rt;
262 int err = 1;
263
264 rt = ip_route_output_flow(dev_net(vrf_dev), fl4, NULL);
265 if (IS_ERR(rt))
266 goto out;
267
268 /* TO-DO: what about broadcast ? */
269 if (rt->rt_type != RTN_UNICAST && rt->rt_type != RTN_LOCAL) {
270 ip_rt_put(rt);
271 goto out;
272 }
273
274 skb_dst_drop(skb);
275 skb_dst_set(skb, &rt->dst);
276 err = 0;
277 out:
278 return err;
279 }
280
281 static netdev_tx_t vrf_process_v4_outbound(struct sk_buff *skb,
282 struct net_device *vrf_dev)
283 {
284 struct iphdr *ip4h = ip_hdr(skb);
285 int ret = NET_XMIT_DROP;
286 struct flowi4 fl4 = {
287 /* needed to match OIF rule */
288 .flowi4_oif = vrf_dev->ifindex,
289 .flowi4_iif = LOOPBACK_IFINDEX,
290 .flowi4_tos = RT_TOS(ip4h->tos),
291 .flowi4_flags = FLOWI_FLAG_ANYSRC | FLOWI_FLAG_L3MDEV_SRC |
292 FLOWI_FLAG_SKIP_NH_OIF,
293 .daddr = ip4h->daddr,
294 };
295
296 if (vrf_send_v4_prep(skb, &fl4, vrf_dev))
297 goto err;
298
299 if (!ip4h->saddr) {
300 ip4h->saddr = inet_select_addr(skb_dst(skb)->dev, 0,
301 RT_SCOPE_LINK);
302 }
303
304 ret = ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb);
305 if (unlikely(net_xmit_eval(ret)))
306 vrf_dev->stats.tx_errors++;
307 else
308 ret = NET_XMIT_SUCCESS;
309
310 out:
311 return ret;
312 err:
313 vrf_tx_error(vrf_dev, skb);
314 goto out;
315 }
316
317 static netdev_tx_t is_ip_tx_frame(struct sk_buff *skb, struct net_device *dev)
318 {
319 /* strip the ethernet header added for pass through VRF device */
320 __skb_pull(skb, skb_network_offset(skb));
321
322 switch (skb->protocol) {
323 case htons(ETH_P_IP):
324 return vrf_process_v4_outbound(skb, dev);
325 case htons(ETH_P_IPV6):
326 return vrf_process_v6_outbound(skb, dev);
327 default:
328 vrf_tx_error(dev, skb);
329 return NET_XMIT_DROP;
330 }
331 }
332
333 static netdev_tx_t vrf_xmit(struct sk_buff *skb, struct net_device *dev)
334 {
335 netdev_tx_t ret = is_ip_tx_frame(skb, dev);
336
337 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
338 struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats);
339
340 u64_stats_update_begin(&dstats->syncp);
341 dstats->tx_pkts++;
342 dstats->tx_bytes += skb->len;
343 u64_stats_update_end(&dstats->syncp);
344 } else {
345 this_cpu_inc(dev->dstats->tx_drps);
346 }
347
348 return ret;
349 }
350
351 #if IS_ENABLED(CONFIG_IPV6)
352 static struct dst_entry *vrf_ip6_check(struct dst_entry *dst, u32 cookie)
353 {
354 return dst;
355 }
356
357 static struct dst_ops vrf_dst_ops6 = {
358 .family = AF_INET6,
359 .local_out = ip6_local_out,
360 .check = vrf_ip6_check,
361 .mtu = vrf_v4_mtu,
362 .destroy = vrf_dst_destroy,
363 .default_advmss = vrf_default_advmss,
364 };
365
366 static int init_dst_ops6_kmem_cachep(void)
367 {
368 vrf_dst_ops6.kmem_cachep = kmem_cache_create("vrf_ip6_dst_cache",
369 sizeof(struct rt6_info),
370 0,
371 SLAB_HWCACHE_ALIGN,
372 NULL);
373
374 if (!vrf_dst_ops6.kmem_cachep)
375 return -ENOMEM;
376
377 return 0;
378 }
379
380 static void free_dst_ops6_kmem_cachep(void)
381 {
382 kmem_cache_destroy(vrf_dst_ops6.kmem_cachep);
383 }
384
385 static int vrf_input6(struct sk_buff *skb)
386 {
387 skb->dev->stats.rx_errors++;
388 kfree_skb(skb);
389 return 0;
390 }
391
392 /* modelled after ip6_finish_output2 */
393 static int vrf_finish_output6(struct net *net, struct sock *sk,
394 struct sk_buff *skb)
395 {
396 struct dst_entry *dst = skb_dst(skb);
397 struct net_device *dev = dst->dev;
398 struct neighbour *neigh;
399 struct in6_addr *nexthop;
400 int ret;
401
402 skb->protocol = htons(ETH_P_IPV6);
403 skb->dev = dev;
404
405 rcu_read_lock_bh();
406 nexthop = rt6_nexthop((struct rt6_info *)dst, &ipv6_hdr(skb)->daddr);
407 neigh = __ipv6_neigh_lookup_noref(dst->dev, nexthop);
408 if (unlikely(!neigh))
409 neigh = __neigh_create(&nd_tbl, nexthop, dst->dev, false);
410 if (!IS_ERR(neigh)) {
411 ret = dst_neigh_output(dst, neigh, skb);
412 rcu_read_unlock_bh();
413 return ret;
414 }
415 rcu_read_unlock_bh();
416
417 IP6_INC_STATS(dev_net(dst->dev),
418 ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES);
419 kfree_skb(skb);
420 return -EINVAL;
421 }
422
423 /* modelled after ip6_output */
424 static int vrf_output6(struct net *net, struct sock *sk, struct sk_buff *skb)
425 {
426 return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING,
427 net, sk, skb, NULL, skb_dst(skb)->dev,
428 vrf_finish_output6,
429 !(IP6CB(skb)->flags & IP6SKB_REROUTED));
430 }
431
432 static void vrf_rt6_destroy(struct net_vrf *vrf)
433 {
434 dst_destroy(&vrf->rt6->dst);
435 free_percpu(vrf->rt6->rt6i_pcpu);
436 vrf->rt6 = NULL;
437 }
438
439 static int vrf_rt6_create(struct net_device *dev)
440 {
441 struct net_vrf *vrf = netdev_priv(dev);
442 struct dst_entry *dst;
443 struct rt6_info *rt6;
444 int cpu;
445 int rc = -ENOMEM;
446
447 rt6 = dst_alloc(&vrf_dst_ops6, dev, 0,
448 DST_OBSOLETE_NONE,
449 (DST_HOST | DST_NOPOLICY | DST_NOXFRM));
450 if (!rt6)
451 goto out;
452
453 dst = &rt6->dst;
454
455 rt6->rt6i_pcpu = alloc_percpu_gfp(struct rt6_info *, GFP_KERNEL);
456 if (!rt6->rt6i_pcpu) {
457 dst_destroy(dst);
458 goto out;
459 }
460 for_each_possible_cpu(cpu) {
461 struct rt6_info **p = per_cpu_ptr(rt6->rt6i_pcpu, cpu);
462 *p = NULL;
463 }
464
465 memset(dst + 1, 0, sizeof(*rt6) - sizeof(*dst));
466
467 INIT_LIST_HEAD(&rt6->rt6i_siblings);
468 INIT_LIST_HEAD(&rt6->rt6i_uncached);
469
470 rt6->dst.input = vrf_input6;
471 rt6->dst.output = vrf_output6;
472
473 rt6->rt6i_table = fib6_get_table(dev_net(dev), vrf->tb_id);
474
475 atomic_set(&rt6->dst.__refcnt, 2);
476
477 vrf->rt6 = rt6;
478 rc = 0;
479 out:
480 return rc;
481 }
482 #else
483 static int init_dst_ops6_kmem_cachep(void)
484 {
485 return 0;
486 }
487
488 static void free_dst_ops6_kmem_cachep(void)
489 {
490 }
491
492 static void vrf_rt6_destroy(struct net_vrf *vrf)
493 {
494 }
495
496 static int vrf_rt6_create(struct net_device *dev)
497 {
498 return 0;
499 }
500 #endif
501
502 /* modelled after ip_finish_output2 */
503 static int vrf_finish_output(struct net *net, struct sock *sk, struct sk_buff *skb)
504 {
505 struct dst_entry *dst = skb_dst(skb);
506 struct rtable *rt = (struct rtable *)dst;
507 struct net_device *dev = dst->dev;
508 unsigned int hh_len = LL_RESERVED_SPACE(dev);
509 struct neighbour *neigh;
510 u32 nexthop;
511 int ret = -EINVAL;
512
513 /* Be paranoid, rather than too clever. */
514 if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) {
515 struct sk_buff *skb2;
516
517 skb2 = skb_realloc_headroom(skb, LL_RESERVED_SPACE(dev));
518 if (!skb2) {
519 ret = -ENOMEM;
520 goto err;
521 }
522 if (skb->sk)
523 skb_set_owner_w(skb2, skb->sk);
524
525 consume_skb(skb);
526 skb = skb2;
527 }
528
529 rcu_read_lock_bh();
530
531 nexthop = (__force u32)rt_nexthop(rt, ip_hdr(skb)->daddr);
532 neigh = __ipv4_neigh_lookup_noref(dev, nexthop);
533 if (unlikely(!neigh))
534 neigh = __neigh_create(&arp_tbl, &nexthop, dev, false);
535 if (!IS_ERR(neigh))
536 ret = dst_neigh_output(dst, neigh, skb);
537
538 rcu_read_unlock_bh();
539 err:
540 if (unlikely(ret < 0))
541 vrf_tx_error(skb->dev, skb);
542 return ret;
543 }
544
545 static int vrf_output(struct net *net, struct sock *sk, struct sk_buff *skb)
546 {
547 struct net_device *dev = skb_dst(skb)->dev;
548
549 IP_UPD_PO_STATS(net, IPSTATS_MIB_OUT, skb->len);
550
551 skb->dev = dev;
552 skb->protocol = htons(ETH_P_IP);
553
554 return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING,
555 net, sk, skb, NULL, dev,
556 vrf_finish_output,
557 !(IPCB(skb)->flags & IPSKB_REROUTED));
558 }
559
560 static void vrf_rtable_destroy(struct net_vrf *vrf)
561 {
562 struct dst_entry *dst = (struct dst_entry *)vrf->rth;
563
564 dst_destroy(dst);
565 vrf->rth = NULL;
566 }
567
568 static struct rtable *vrf_rtable_create(struct net_device *dev)
569 {
570 struct net_vrf *vrf = netdev_priv(dev);
571 struct rtable *rth;
572
573 rth = dst_alloc(&vrf_dst_ops, dev, 2,
574 DST_OBSOLETE_NONE,
575 (DST_HOST | DST_NOPOLICY | DST_NOXFRM));
576 if (rth) {
577 rth->dst.output = vrf_output;
578 rth->rt_genid = rt_genid_ipv4(dev_net(dev));
579 rth->rt_flags = 0;
580 rth->rt_type = RTN_UNICAST;
581 rth->rt_is_input = 0;
582 rth->rt_iif = 0;
583 rth->rt_pmtu = 0;
584 rth->rt_gateway = 0;
585 rth->rt_uses_gateway = 0;
586 rth->rt_table_id = vrf->tb_id;
587 INIT_LIST_HEAD(&rth->rt_uncached);
588 rth->rt_uncached_list = NULL;
589 }
590
591 return rth;
592 }
593
594 /**************************** device handling ********************/
595
596 /* cycle interface to flush neighbor cache and move routes across tables */
597 static void cycle_netdev(struct net_device *dev)
598 {
599 unsigned int flags = dev->flags;
600 int ret;
601
602 if (!netif_running(dev))
603 return;
604
605 ret = dev_change_flags(dev, flags & ~IFF_UP);
606 if (ret >= 0)
607 ret = dev_change_flags(dev, flags);
608
609 if (ret < 0) {
610 netdev_err(dev,
611 "Failed to cycle device %s; route tables might be wrong!\n",
612 dev->name);
613 }
614 }
615
616 static int do_vrf_add_slave(struct net_device *dev, struct net_device *port_dev)
617 {
618 int ret;
619
620 /* register the packet handler for slave ports */
621 ret = netdev_rx_handler_register(port_dev, vrf_handle_frame, dev);
622 if (ret) {
623 netdev_err(port_dev,
624 "Device %s failed to register rx_handler\n",
625 port_dev->name);
626 goto out_fail;
627 }
628
629 ret = netdev_master_upper_dev_link(port_dev, dev, NULL, NULL);
630 if (ret < 0)
631 goto out_unregister;
632
633 port_dev->priv_flags |= IFF_L3MDEV_SLAVE;
634 cycle_netdev(port_dev);
635
636 return 0;
637
638 out_unregister:
639 netdev_rx_handler_unregister(port_dev);
640 out_fail:
641 return ret;
642 }
643
644 static int vrf_add_slave(struct net_device *dev, struct net_device *port_dev)
645 {
646 if (netif_is_l3_master(port_dev) || netif_is_l3_slave(port_dev))
647 return -EINVAL;
648
649 return do_vrf_add_slave(dev, port_dev);
650 }
651
652 /* inverse of do_vrf_add_slave */
653 static int do_vrf_del_slave(struct net_device *dev, struct net_device *port_dev)
654 {
655 netdev_upper_dev_unlink(port_dev, dev);
656 port_dev->priv_flags &= ~IFF_L3MDEV_SLAVE;
657
658 netdev_rx_handler_unregister(port_dev);
659
660 cycle_netdev(port_dev);
661
662 return 0;
663 }
664
665 static int vrf_del_slave(struct net_device *dev, struct net_device *port_dev)
666 {
667 return do_vrf_del_slave(dev, port_dev);
668 }
669
670 static void vrf_dev_uninit(struct net_device *dev)
671 {
672 struct net_vrf *vrf = netdev_priv(dev);
673 struct net_device *port_dev;
674 struct list_head *iter;
675
676 vrf_rtable_destroy(vrf);
677 vrf_rt6_destroy(vrf);
678
679 netdev_for_each_lower_dev(dev, port_dev, iter)
680 vrf_del_slave(dev, port_dev);
681
682 free_percpu(dev->dstats);
683 dev->dstats = NULL;
684 }
685
686 static int vrf_dev_init(struct net_device *dev)
687 {
688 struct net_vrf *vrf = netdev_priv(dev);
689
690 dev->dstats = netdev_alloc_pcpu_stats(struct pcpu_dstats);
691 if (!dev->dstats)
692 goto out_nomem;
693
694 /* create the default dst which points back to us */
695 vrf->rth = vrf_rtable_create(dev);
696 if (!vrf->rth)
697 goto out_stats;
698
699 if (vrf_rt6_create(dev) != 0)
700 goto out_rth;
701
702 dev->flags = IFF_MASTER | IFF_NOARP;
703
704 return 0;
705
706 out_rth:
707 vrf_rtable_destroy(vrf);
708 out_stats:
709 free_percpu(dev->dstats);
710 dev->dstats = NULL;
711 out_nomem:
712 return -ENOMEM;
713 }
714
715 static const struct net_device_ops vrf_netdev_ops = {
716 .ndo_init = vrf_dev_init,
717 .ndo_uninit = vrf_dev_uninit,
718 .ndo_start_xmit = vrf_xmit,
719 .ndo_get_stats64 = vrf_get_stats64,
720 .ndo_add_slave = vrf_add_slave,
721 .ndo_del_slave = vrf_del_slave,
722 };
723
724 static u32 vrf_fib_table(const struct net_device *dev)
725 {
726 struct net_vrf *vrf = netdev_priv(dev);
727
728 return vrf->tb_id;
729 }
730
731 static struct rtable *vrf_get_rtable(const struct net_device *dev,
732 const struct flowi4 *fl4)
733 {
734 struct rtable *rth = NULL;
735
736 if (!(fl4->flowi4_flags & FLOWI_FLAG_L3MDEV_SRC)) {
737 struct net_vrf *vrf = netdev_priv(dev);
738
739 rth = vrf->rth;
740 atomic_inc(&rth->dst.__refcnt);
741 }
742
743 return rth;
744 }
745
746 /* called under rcu_read_lock */
747 static int vrf_get_saddr(struct net_device *dev, struct flowi4 *fl4)
748 {
749 struct fib_result res = { .tclassid = 0 };
750 struct net *net = dev_net(dev);
751 u32 orig_tos = fl4->flowi4_tos;
752 u8 flags = fl4->flowi4_flags;
753 u8 scope = fl4->flowi4_scope;
754 u8 tos = RT_FL_TOS(fl4);
755 int rc;
756
757 if (unlikely(!fl4->daddr))
758 return 0;
759
760 fl4->flowi4_flags |= FLOWI_FLAG_SKIP_NH_OIF;
761 fl4->flowi4_iif = LOOPBACK_IFINDEX;
762 fl4->flowi4_tos = tos & IPTOS_RT_MASK;
763 fl4->flowi4_scope = ((tos & RTO_ONLINK) ?
764 RT_SCOPE_LINK : RT_SCOPE_UNIVERSE);
765
766 rc = fib_lookup(net, fl4, &res, 0);
767 if (!rc) {
768 if (res.type == RTN_LOCAL)
769 fl4->saddr = res.fi->fib_prefsrc ? : fl4->daddr;
770 else
771 fib_select_path(net, &res, fl4, -1);
772 }
773
774 fl4->flowi4_flags = flags;
775 fl4->flowi4_tos = orig_tos;
776 fl4->flowi4_scope = scope;
777
778 return rc;
779 }
780
781 #if IS_ENABLED(CONFIG_IPV6)
782 static struct dst_entry *vrf_get_rt6_dst(const struct net_device *dev,
783 const struct flowi6 *fl6)
784 {
785 struct rt6_info *rt = NULL;
786
787 if (!(fl6->flowi6_flags & FLOWI_FLAG_L3MDEV_SRC)) {
788 struct net_vrf *vrf = netdev_priv(dev);
789
790 rt = vrf->rt6;
791 atomic_inc(&rt->dst.__refcnt);
792 }
793
794 return (struct dst_entry *)rt;
795 }
796 #endif
797
798 static const struct l3mdev_ops vrf_l3mdev_ops = {
799 .l3mdev_fib_table = vrf_fib_table,
800 .l3mdev_get_rtable = vrf_get_rtable,
801 .l3mdev_get_saddr = vrf_get_saddr,
802 #if IS_ENABLED(CONFIG_IPV6)
803 .l3mdev_get_rt6_dst = vrf_get_rt6_dst,
804 #endif
805 };
806
807 static void vrf_get_drvinfo(struct net_device *dev,
808 struct ethtool_drvinfo *info)
809 {
810 strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
811 strlcpy(info->version, DRV_VERSION, sizeof(info->version));
812 }
813
814 static const struct ethtool_ops vrf_ethtool_ops = {
815 .get_drvinfo = vrf_get_drvinfo,
816 };
817
818 static void vrf_setup(struct net_device *dev)
819 {
820 ether_setup(dev);
821
822 /* Initialize the device structure. */
823 dev->netdev_ops = &vrf_netdev_ops;
824 dev->l3mdev_ops = &vrf_l3mdev_ops;
825 dev->ethtool_ops = &vrf_ethtool_ops;
826 dev->destructor = free_netdev;
827
828 /* Fill in device structure with ethernet-generic values. */
829 eth_hw_addr_random(dev);
830
831 /* don't acquire vrf device's netif_tx_lock when transmitting */
832 dev->features |= NETIF_F_LLTX;
833
834 /* don't allow vrf devices to change network namespaces. */
835 dev->features |= NETIF_F_NETNS_LOCAL;
836 }
837
838 static int vrf_validate(struct nlattr *tb[], struct nlattr *data[])
839 {
840 if (tb[IFLA_ADDRESS]) {
841 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
842 return -EINVAL;
843 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
844 return -EADDRNOTAVAIL;
845 }
846 return 0;
847 }
848
849 static void vrf_dellink(struct net_device *dev, struct list_head *head)
850 {
851 unregister_netdevice_queue(dev, head);
852 }
853
854 static int vrf_newlink(struct net *src_net, struct net_device *dev,
855 struct nlattr *tb[], struct nlattr *data[])
856 {
857 struct net_vrf *vrf = netdev_priv(dev);
858
859 if (!data || !data[IFLA_VRF_TABLE])
860 return -EINVAL;
861
862 vrf->tb_id = nla_get_u32(data[IFLA_VRF_TABLE]);
863
864 dev->priv_flags |= IFF_L3MDEV_MASTER;
865
866 return register_netdevice(dev);
867 }
868
869 static size_t vrf_nl_getsize(const struct net_device *dev)
870 {
871 return nla_total_size(sizeof(u32)); /* IFLA_VRF_TABLE */
872 }
873
874 static int vrf_fillinfo(struct sk_buff *skb,
875 const struct net_device *dev)
876 {
877 struct net_vrf *vrf = netdev_priv(dev);
878
879 return nla_put_u32(skb, IFLA_VRF_TABLE, vrf->tb_id);
880 }
881
882 static size_t vrf_get_slave_size(const struct net_device *bond_dev,
883 const struct net_device *slave_dev)
884 {
885 return nla_total_size(sizeof(u32)); /* IFLA_VRF_PORT_TABLE */
886 }
887
888 static int vrf_fill_slave_info(struct sk_buff *skb,
889 const struct net_device *vrf_dev,
890 const struct net_device *slave_dev)
891 {
892 struct net_vrf *vrf = netdev_priv(vrf_dev);
893
894 if (nla_put_u32(skb, IFLA_VRF_PORT_TABLE, vrf->tb_id))
895 return -EMSGSIZE;
896
897 return 0;
898 }
899
900 static const struct nla_policy vrf_nl_policy[IFLA_VRF_MAX + 1] = {
901 [IFLA_VRF_TABLE] = { .type = NLA_U32 },
902 };
903
904 static struct rtnl_link_ops vrf_link_ops __read_mostly = {
905 .kind = DRV_NAME,
906 .priv_size = sizeof(struct net_vrf),
907
908 .get_size = vrf_nl_getsize,
909 .policy = vrf_nl_policy,
910 .validate = vrf_validate,
911 .fill_info = vrf_fillinfo,
912
913 .get_slave_size = vrf_get_slave_size,
914 .fill_slave_info = vrf_fill_slave_info,
915
916 .newlink = vrf_newlink,
917 .dellink = vrf_dellink,
918 .setup = vrf_setup,
919 .maxtype = IFLA_VRF_MAX,
920 };
921
922 static int vrf_device_event(struct notifier_block *unused,
923 unsigned long event, void *ptr)
924 {
925 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
926
927 /* only care about unregister events to drop slave references */
928 if (event == NETDEV_UNREGISTER) {
929 struct net_device *vrf_dev;
930
931 if (!netif_is_l3_slave(dev))
932 goto out;
933
934 vrf_dev = netdev_master_upper_dev_get(dev);
935 vrf_del_slave(vrf_dev, dev);
936 }
937 out:
938 return NOTIFY_DONE;
939 }
940
941 static struct notifier_block vrf_notifier_block __read_mostly = {
942 .notifier_call = vrf_device_event,
943 };
944
945 static int __init vrf_init_module(void)
946 {
947 int rc;
948
949 vrf_dst_ops.kmem_cachep =
950 kmem_cache_create("vrf_ip_dst_cache",
951 sizeof(struct rtable), 0,
952 SLAB_HWCACHE_ALIGN,
953 NULL);
954
955 if (!vrf_dst_ops.kmem_cachep)
956 return -ENOMEM;
957
958 rc = init_dst_ops6_kmem_cachep();
959 if (rc != 0)
960 goto error2;
961
962 register_netdevice_notifier(&vrf_notifier_block);
963
964 rc = rtnl_link_register(&vrf_link_ops);
965 if (rc < 0)
966 goto error;
967
968 return 0;
969
970 error:
971 unregister_netdevice_notifier(&vrf_notifier_block);
972 free_dst_ops6_kmem_cachep();
973 error2:
974 kmem_cache_destroy(vrf_dst_ops.kmem_cachep);
975 return rc;
976 }
977
978 static void __exit vrf_cleanup_module(void)
979 {
980 rtnl_link_unregister(&vrf_link_ops);
981 unregister_netdevice_notifier(&vrf_notifier_block);
982 kmem_cache_destroy(vrf_dst_ops.kmem_cachep);
983 free_dst_ops6_kmem_cachep();
984 }
985
986 module_init(vrf_init_module);
987 module_exit(vrf_cleanup_module);
988 MODULE_AUTHOR("Shrijeet Mukherjee, David Ahern");
989 MODULE_DESCRIPTION("Device driver to instantiate VRF domains");
990 MODULE_LICENSE("GPL");
991 MODULE_ALIAS_RTNL_LINK(DRV_NAME);
992 MODULE_VERSION(DRV_VERSION);
Linux kernel - Deliverables
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