1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * vrf.c: device driver to encapsulate a VRF space
4 *
5 * Copyright (c) 2015 Cumulus Networks. All rights reserved.
6 * Copyright (c) 2015 Shrijeet Mukherjee <shm@cumulusnetworks.com>
7 * Copyright (c) 2015 David Ahern <dsa@cumulusnetworks.com>
8 *
9 * Based on dummy, team and ipvlan drivers
10 */
11
12 #include <linux/ethtool.h>
13 #include <linux/module.h>
14 #include <linux/kernel.h>
15 #include <linux/netdevice.h>
16 #include <linux/etherdevice.h>
17 #include <linux/ip.h>
18 #include <linux/init.h>
19 #include <linux/moduleparam.h>
20 #include <linux/netfilter.h>
21 #include <linux/rtnetlink.h>
22 #include <net/rtnetlink.h>
23 #include <linux/u64_stats_sync.h>
24 #include <linux/hashtable.h>
25 #include <linux/spinlock_types.h>
26
27 #include <linux/inetdevice.h>
28 #include <net/arp.h>
29 #include <net/ip.h>
30 #include <net/ip_fib.h>
31 #include <net/ip6_fib.h>
32 #include <net/ip6_route.h>
33 #include <net/route.h>
34 #include <net/addrconf.h>
35 #include <net/l3mdev.h>
36 #include <net/fib_rules.h>
37 #include <net/sch_generic.h>
38 #include <net/netns/generic.h>
39 #include <net/netfilter/nf_conntrack.h>
40 #include <net/inet_dscp.h>
41
42 #define DRV_NAME "vrf"
43 #define DRV_VERSION "1.1"
44
45 #define FIB_RULE_PREF 1000 /* default preference for FIB rules */
46
47 #define HT_MAP_BITS 4
48 #define HASH_INITVAL ((u32)0xcafef00d)
49
50 struct vrf_map {
51 DECLARE_HASHTABLE(ht, HT_MAP_BITS);
52 spinlock_t vmap_lock;
53
54 /* shared_tables:
55 * count how many distinct tables do not comply with the strict mode
56 * requirement.
57 * shared_tables value must be 0 in order to enable the strict mode.
58 *
59 * example of the evolution of shared_tables:
60 * | time
61 * add vrf0 --> table 100 shared_tables = 0 | t0
62 * add vrf1 --> table 101 shared_tables = 0 | t1
63 * add vrf2 --> table 100 shared_tables = 1 | t2
64 * add vrf3 --> table 100 shared_tables = 1 | t3
65 * add vrf4 --> table 101 shared_tables = 2 v t4
66 *
67 * shared_tables is a "step function" (or "staircase function")
68 * and it is increased by one when the second vrf is associated to a
69 * table.
70 *
71 * at t2, vrf0 and vrf2 are bound to table 100: shared_tables = 1.
72 *
73 * at t3, another dev (vrf3) is bound to the same table 100 but the
74 * value of shared_tables is still 1.
75 * This means that no matter how many new vrfs will register on the
76 * table 100, the shared_tables will not increase (considering only
77 * table 100).
78 *
79 * at t4, vrf4 is bound to table 101, and shared_tables = 2.
80 *
81 * Looking at the value of shared_tables we can immediately know if
82 * the strict_mode can or cannot be enforced. Indeed, strict_mode
83 * can be enforced iff shared_tables = 0.
84 *
85 * Conversely, shared_tables is decreased when a vrf is de-associated
86 * from a table with exactly two associated vrfs.
87 */
88 u32 shared_tables;
89
90 bool strict_mode;
91 };
92
93 struct vrf_map_elem {
94 struct hlist_node hnode;
95 struct list_head vrf_list; /* VRFs registered to this table */
96
97 u32 table_id;
98 int users;
99 int ifindex;
100 };
101
102 static unsigned int vrf_net_id;
103
104 /* per netns vrf data */
105 struct netns_vrf {
106 /* protected by rtnl lock */
107 bool add_fib_rules;
108
109 struct vrf_map vmap;
110 struct ctl_table_header *ctl_hdr;
111 };
112
113 struct net_vrf {
114 struct rtable __rcu *rth;
115 struct rt6_info __rcu *rt6;
116 #if IS_ENABLED(CONFIG_IPV6)
117 struct fib6_table *fib6_table;
118 #endif
119 u32 tb_id;
120
121 struct list_head me_list; /* entry in vrf_map_elem */
122 int ifindex;
123 };
124
vrf_rx_stats(struct net_device * dev,int len)125 static void vrf_rx_stats(struct net_device *dev, int len)
126 {
127 struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats);
128
129 u64_stats_update_begin(&dstats->syncp);
130 u64_stats_inc(&dstats->rx_packets);
131 u64_stats_add(&dstats->rx_bytes, len);
132 u64_stats_update_end(&dstats->syncp);
133 }
134
vrf_tx_error(struct net_device * vrf_dev,struct sk_buff * skb)135 static void vrf_tx_error(struct net_device *vrf_dev, struct sk_buff *skb)
136 {
137 vrf_dev->stats.tx_errors++;
138 kfree_skb(skb);
139 }
140
netns_vrf_map(struct net * net)141 static struct vrf_map *netns_vrf_map(struct net *net)
142 {
143 struct netns_vrf *nn_vrf = net_generic(net, vrf_net_id);
144
145 return &nn_vrf->vmap;
146 }
147
netns_vrf_map_by_dev(struct net_device * dev)148 static struct vrf_map *netns_vrf_map_by_dev(struct net_device *dev)
149 {
150 return netns_vrf_map(dev_net(dev));
151 }
152
vrf_map_elem_get_vrf_ifindex(struct vrf_map_elem * me)153 static int vrf_map_elem_get_vrf_ifindex(struct vrf_map_elem *me)
154 {
155 struct list_head *me_head = &me->vrf_list;
156 struct net_vrf *vrf;
157
158 if (list_empty(me_head))
159 return -ENODEV;
160
161 vrf = list_first_entry(me_head, struct net_vrf, me_list);
162
163 return vrf->ifindex;
164 }
165
vrf_map_elem_alloc(gfp_t flags)166 static struct vrf_map_elem *vrf_map_elem_alloc(gfp_t flags)
167 {
168 struct vrf_map_elem *me;
169
170 me = kmalloc(sizeof(*me), flags);
171 if (!me)
172 return NULL;
173
174 return me;
175 }
176
vrf_map_elem_free(struct vrf_map_elem * me)177 static void vrf_map_elem_free(struct vrf_map_elem *me)
178 {
179 kfree(me);
180 }
181
vrf_map_elem_init(struct vrf_map_elem * me,int table_id,int ifindex,int users)182 static void vrf_map_elem_init(struct vrf_map_elem *me, int table_id,
183 int ifindex, int users)
184 {
185 me->table_id = table_id;
186 me->ifindex = ifindex;
187 me->users = users;
188 INIT_LIST_HEAD(&me->vrf_list);
189 }
190
vrf_map_lookup_elem(struct vrf_map * vmap,u32 table_id)191 static struct vrf_map_elem *vrf_map_lookup_elem(struct vrf_map *vmap,
192 u32 table_id)
193 {
194 struct vrf_map_elem *me;
195 u32 key;
196
197 key = jhash_1word(table_id, HASH_INITVAL);
198 hash_for_each_possible(vmap->ht, me, hnode, key) {
199 if (me->table_id == table_id)
200 return me;
201 }
202
203 return NULL;
204 }
205
vrf_map_add_elem(struct vrf_map * vmap,struct vrf_map_elem * me)206 static void vrf_map_add_elem(struct vrf_map *vmap, struct vrf_map_elem *me)
207 {
208 u32 table_id = me->table_id;
209 u32 key;
210
211 key = jhash_1word(table_id, HASH_INITVAL);
212 hash_add(vmap->ht, &me->hnode, key);
213 }
214
vrf_map_del_elem(struct vrf_map_elem * me)215 static void vrf_map_del_elem(struct vrf_map_elem *me)
216 {
217 hash_del(&me->hnode);
218 }
219
vrf_map_lock(struct vrf_map * vmap)220 static void vrf_map_lock(struct vrf_map *vmap) __acquires(&vmap->vmap_lock)
221 {
222 spin_lock(&vmap->vmap_lock);
223 }
224
vrf_map_unlock(struct vrf_map * vmap)225 static void vrf_map_unlock(struct vrf_map *vmap) __releases(&vmap->vmap_lock)
226 {
227 spin_unlock(&vmap->vmap_lock);
228 }
229
230 /* called with rtnl lock held */
231 static int
vrf_map_register_dev(struct net_device * dev,struct netlink_ext_ack * extack)232 vrf_map_register_dev(struct net_device *dev, struct netlink_ext_ack *extack)
233 {
234 struct vrf_map *vmap = netns_vrf_map_by_dev(dev);
235 struct net_vrf *vrf = netdev_priv(dev);
236 struct vrf_map_elem *new_me, *me;
237 u32 table_id = vrf->tb_id;
238 bool free_new_me = false;
239 int users;
240 int res;
241
242 /* we pre-allocate elements used in the spin-locked section (so that we
243 * keep the spinlock as short as possible).
244 */
245 new_me = vrf_map_elem_alloc(GFP_KERNEL);
246 if (!new_me)
247 return -ENOMEM;
248
249 vrf_map_elem_init(new_me, table_id, dev->ifindex, 0);
250
251 vrf_map_lock(vmap);
252
253 me = vrf_map_lookup_elem(vmap, table_id);
254 if (!me) {
255 me = new_me;
256 vrf_map_add_elem(vmap, me);
257 goto link_vrf;
258 }
259
260 /* we already have an entry in the vrf_map, so it means there is (at
261 * least) a vrf registered on the specific table.
262 */
263 free_new_me = true;
264 if (vmap->strict_mode) {
265 /* vrfs cannot share the same table */
266 NL_SET_ERR_MSG(extack, "Table is used by another VRF");
267 res = -EBUSY;
268 goto unlock;
269 }
270
271 link_vrf:
272 users = ++me->users;
273 if (users == 2)
274 ++vmap->shared_tables;
275
276 list_add(&vrf->me_list, &me->vrf_list);
277
278 res = 0;
279
280 unlock:
281 vrf_map_unlock(vmap);
282
283 /* clean-up, if needed */
284 if (free_new_me)
285 vrf_map_elem_free(new_me);
286
287 return res;
288 }
289
290 /* called with rtnl lock held */
vrf_map_unregister_dev(struct net_device * dev)291 static void vrf_map_unregister_dev(struct net_device *dev)
292 {
293 struct vrf_map *vmap = netns_vrf_map_by_dev(dev);
294 struct net_vrf *vrf = netdev_priv(dev);
295 u32 table_id = vrf->tb_id;
296 struct vrf_map_elem *me;
297 int users;
298
299 vrf_map_lock(vmap);
300
301 me = vrf_map_lookup_elem(vmap, table_id);
302 if (!me)
303 goto unlock;
304
305 list_del(&vrf->me_list);
306
307 users = --me->users;
308 if (users == 1) {
309 --vmap->shared_tables;
310 } else if (users == 0) {
311 vrf_map_del_elem(me);
312
313 /* no one will refer to this element anymore */
314 vrf_map_elem_free(me);
315 }
316
317 unlock:
318 vrf_map_unlock(vmap);
319 }
320
321 /* return the vrf device index associated with the table_id */
vrf_ifindex_lookup_by_table_id(struct net * net,u32 table_id)322 static int vrf_ifindex_lookup_by_table_id(struct net *net, u32 table_id)
323 {
324 struct vrf_map *vmap = netns_vrf_map(net);
325 struct vrf_map_elem *me;
326 int ifindex;
327
328 vrf_map_lock(vmap);
329
330 if (!vmap->strict_mode) {
331 ifindex = -EPERM;
332 goto unlock;
333 }
334
335 me = vrf_map_lookup_elem(vmap, table_id);
336 if (!me) {
337 ifindex = -ENODEV;
338 goto unlock;
339 }
340
341 ifindex = vrf_map_elem_get_vrf_ifindex(me);
342
343 unlock:
344 vrf_map_unlock(vmap);
345
346 return ifindex;
347 }
348
349 /* by default VRF devices do not have a qdisc and are expected
350 * to be created with only a single queue.
351 */
qdisc_tx_is_default(const struct net_device * dev)352 static bool qdisc_tx_is_default(const struct net_device *dev)
353 {
354 struct netdev_queue *txq;
355 struct Qdisc *qdisc;
356
357 if (dev->num_tx_queues > 1)
358 return false;
359
360 txq = netdev_get_tx_queue(dev, 0);
361 qdisc = rcu_access_pointer(txq->qdisc);
362
363 return !qdisc->enqueue;
364 }
365
366 /* Local traffic destined to local address. Reinsert the packet to rx
367 * path, similar to loopback handling.
368 */
vrf_local_xmit(struct sk_buff * skb,struct net_device * dev,struct dst_entry * dst)369 static int vrf_local_xmit(struct sk_buff *skb, struct net_device *dev,
370 struct dst_entry *dst)
371 {
372 int len = skb->len;
373
374 skb_orphan(skb);
375
376 skb_dst_set(skb, dst);
377
378 /* set pkt_type to avoid skb hitting packet taps twice -
379 * once on Tx and again in Rx processing
380 */
381 skb->pkt_type = PACKET_LOOPBACK;
382
383 skb->protocol = eth_type_trans(skb, dev);
384
385 if (likely(__netif_rx(skb) == NET_RX_SUCCESS)) {
386 vrf_rx_stats(dev, len);
387 } else {
388 struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats);
389
390 u64_stats_update_begin(&dstats->syncp);
391 u64_stats_inc(&dstats->rx_drops);
392 u64_stats_update_end(&dstats->syncp);
393 }
394
395 return NETDEV_TX_OK;
396 }
397
vrf_nf_set_untracked(struct sk_buff * skb)398 static void vrf_nf_set_untracked(struct sk_buff *skb)
399 {
400 if (skb_get_nfct(skb) == 0)
401 nf_ct_set(skb, NULL, IP_CT_UNTRACKED);
402 }
403
vrf_nf_reset_ct(struct sk_buff * skb)404 static void vrf_nf_reset_ct(struct sk_buff *skb)
405 {
406 if (skb_get_nfct(skb) == IP_CT_UNTRACKED)
407 nf_reset_ct(skb);
408 }
409
410 #if IS_ENABLED(CONFIG_IPV6)
vrf_ip6_local_out(struct net * net,struct sock * sk,struct sk_buff * skb)411 static int vrf_ip6_local_out(struct net *net, struct sock *sk,
412 struct sk_buff *skb)
413 {
414 int err;
415
416 vrf_nf_reset_ct(skb);
417
418 err = nf_hook(NFPROTO_IPV6, NF_INET_LOCAL_OUT, net,
419 sk, skb, NULL, skb_dst(skb)->dev, dst_output);
420
421 if (likely(err == 1))
422 err = dst_output(net, sk, skb);
423
424 return err;
425 }
426
vrf_process_v6_outbound(struct sk_buff * skb,struct net_device * dev)427 static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb,
428 struct net_device *dev)
429 {
430 const struct ipv6hdr *iph;
431 struct net *net = dev_net(skb->dev);
432 struct flowi6 fl6;
433 int ret = NET_XMIT_DROP;
434 struct dst_entry *dst;
435 struct dst_entry *dst_null = &net->ipv6.ip6_null_entry->dst;
436
437 if (!pskb_may_pull(skb, ETH_HLEN + sizeof(struct ipv6hdr)))
438 goto err;
439
440 iph = ipv6_hdr(skb);
441
442 memset(&fl6, 0, sizeof(fl6));
443 /* needed to match OIF rule */
444 fl6.flowi6_l3mdev = dev->ifindex;
445 fl6.flowi6_iif = LOOPBACK_IFINDEX;
446 fl6.daddr = iph->daddr;
447 fl6.saddr = iph->saddr;
448 fl6.flowlabel = ip6_flowinfo(iph);
449 fl6.flowi6_mark = skb->mark;
450 fl6.flowi6_proto = iph->nexthdr;
451
452 dst = ip6_dst_lookup_flow(net, NULL, &fl6, NULL);
453 if (IS_ERR(dst) || dst == dst_null)
454 goto err;
455
456 skb_dst_drop(skb);
457
458 /* if dst.dev is the VRF device again this is locally originated traffic
459 * destined to a local address. Short circuit to Rx path.
460 */
461 if (dst->dev == dev)
462 return vrf_local_xmit(skb, dev, dst);
463
464 skb_dst_set(skb, dst);
465
466 /* strip the ethernet header added for pass through VRF device */
467 __skb_pull(skb, skb_network_offset(skb));
468
469 memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
470 ret = vrf_ip6_local_out(net, skb->sk, skb);
471 if (unlikely(net_xmit_eval(ret)))
472 dev->stats.tx_errors++;
473 else
474 ret = NET_XMIT_SUCCESS;
475
476 return ret;
477 err:
478 vrf_tx_error(dev, skb);
479 return NET_XMIT_DROP;
480 }
481 #else
vrf_process_v6_outbound(struct sk_buff * skb,struct net_device * dev)482 static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb,
483 struct net_device *dev)
484 {
485 vrf_tx_error(dev, skb);
486 return NET_XMIT_DROP;
487 }
488 #endif
489
490 /* based on ip_local_out; can't use it b/c the dst is switched pointing to us */
vrf_ip_local_out(struct net * net,struct sock * sk,struct sk_buff * skb)491 static int vrf_ip_local_out(struct net *net, struct sock *sk,
492 struct sk_buff *skb)
493 {
494 int err;
495
496 vrf_nf_reset_ct(skb);
497
498 err = nf_hook(NFPROTO_IPV4, NF_INET_LOCAL_OUT, net, sk,
499 skb, NULL, skb_dst(skb)->dev, dst_output);
500 if (likely(err == 1))
501 err = dst_output(net, sk, skb);
502
503 return err;
504 }
505
vrf_process_v4_outbound(struct sk_buff * skb,struct net_device * vrf_dev)506 static netdev_tx_t vrf_process_v4_outbound(struct sk_buff *skb,
507 struct net_device *vrf_dev)
508 {
509 struct iphdr *ip4h;
510 int ret = NET_XMIT_DROP;
511 struct flowi4 fl4;
512 struct net *net = dev_net(vrf_dev);
513 struct rtable *rt;
514
515 if (!pskb_may_pull(skb, ETH_HLEN + sizeof(struct iphdr)))
516 goto err;
517
518 ip4h = ip_hdr(skb);
519
520 memset(&fl4, 0, sizeof(fl4));
521 /* needed to match OIF rule */
522 fl4.flowi4_l3mdev = vrf_dev->ifindex;
523 fl4.flowi4_iif = LOOPBACK_IFINDEX;
524 fl4.flowi4_tos = ip4h->tos & INET_DSCP_MASK;
525 fl4.flowi4_flags = FLOWI_FLAG_ANYSRC;
526 fl4.flowi4_proto = ip4h->protocol;
527 fl4.daddr = ip4h->daddr;
528 fl4.saddr = ip4h->saddr;
529
530 rt = ip_route_output_flow(net, &fl4, NULL);
531 if (IS_ERR(rt))
532 goto err;
533
534 skb_dst_drop(skb);
535
536 /* if dst.dev is the VRF device again this is locally originated traffic
537 * destined to a local address. Short circuit to Rx path.
538 */
539 if (rt->dst.dev == vrf_dev)
540 return vrf_local_xmit(skb, vrf_dev, &rt->dst);
541
542 skb_dst_set(skb, &rt->dst);
543
544 /* strip the ethernet header added for pass through VRF device */
545 __skb_pull(skb, skb_network_offset(skb));
546
547 if (!ip4h->saddr) {
548 ip4h->saddr = inet_select_addr(skb_dst(skb)->dev, 0,
549 RT_SCOPE_LINK);
550 }
551
552 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
553 ret = vrf_ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb);
554 if (unlikely(net_xmit_eval(ret)))
555 vrf_dev->stats.tx_errors++;
556 else
557 ret = NET_XMIT_SUCCESS;
558
559 out:
560 return ret;
561 err:
562 vrf_tx_error(vrf_dev, skb);
563 goto out;
564 }
565
is_ip_tx_frame(struct sk_buff * skb,struct net_device * dev)566 static netdev_tx_t is_ip_tx_frame(struct sk_buff *skb, struct net_device *dev)
567 {
568 switch (skb->protocol) {
569 case htons(ETH_P_IP):
570 return vrf_process_v4_outbound(skb, dev);
571 case htons(ETH_P_IPV6):
572 return vrf_process_v6_outbound(skb, dev);
573 default:
574 vrf_tx_error(dev, skb);
575 return NET_XMIT_DROP;
576 }
577 }
578
vrf_xmit(struct sk_buff * skb,struct net_device * dev)579 static netdev_tx_t vrf_xmit(struct sk_buff *skb, struct net_device *dev)
580 {
581 struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats);
582
583 int len = skb->len;
584 netdev_tx_t ret = is_ip_tx_frame(skb, dev);
585
586 u64_stats_update_begin(&dstats->syncp);
587 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
588
589 u64_stats_inc(&dstats->tx_packets);
590 u64_stats_add(&dstats->tx_bytes, len);
591 } else {
592 u64_stats_inc(&dstats->tx_drops);
593 }
594 u64_stats_update_end(&dstats->syncp);
595
596 return ret;
597 }
598
vrf_finish_direct(struct sk_buff * skb)599 static void vrf_finish_direct(struct sk_buff *skb)
600 {
601 struct net_device *vrf_dev = skb->dev;
602
603 if (!list_empty(&vrf_dev->ptype_all) &&
604 likely(skb_headroom(skb) >= ETH_HLEN)) {
605 struct ethhdr *eth = skb_push(skb, ETH_HLEN);
606
607 ether_addr_copy(eth->h_source, vrf_dev->dev_addr);
608 eth_zero_addr(eth->h_dest);
609 eth->h_proto = skb->protocol;
610
611 dev_queue_xmit_nit(skb, vrf_dev);
612
613 skb_pull(skb, ETH_HLEN);
614 }
615
616 vrf_nf_reset_ct(skb);
617 }
618
619 #if IS_ENABLED(CONFIG_IPV6)
620 /* modelled after ip6_finish_output2 */
vrf_finish_output6(struct net * net,struct sock * sk,struct sk_buff * skb)621 static int vrf_finish_output6(struct net *net, struct sock *sk,
622 struct sk_buff *skb)
623 {
624 struct dst_entry *dst = skb_dst(skb);
625 struct net_device *dev = dst->dev;
626 const struct in6_addr *nexthop;
627 struct neighbour *neigh;
628 int ret;
629
630 vrf_nf_reset_ct(skb);
631
632 skb->protocol = htons(ETH_P_IPV6);
633 skb->dev = dev;
634
635 rcu_read_lock();
636 nexthop = rt6_nexthop(dst_rt6_info(dst), &ipv6_hdr(skb)->daddr);
637 neigh = __ipv6_neigh_lookup_noref(dst->dev, nexthop);
638 if (unlikely(!neigh))
639 neigh = __neigh_create(&nd_tbl, nexthop, dst->dev, false);
640 if (!IS_ERR(neigh)) {
641 sock_confirm_neigh(skb, neigh);
642 ret = neigh_output(neigh, skb, false);
643 rcu_read_unlock();
644 return ret;
645 }
646 rcu_read_unlock();
647
648 IP6_INC_STATS(dev_net(dst->dev),
649 ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES);
650 kfree_skb(skb);
651 return -EINVAL;
652 }
653
654 /* modelled after ip6_output */
vrf_output6(struct net * net,struct sock * sk,struct sk_buff * skb)655 static int vrf_output6(struct net *net, struct sock *sk, struct sk_buff *skb)
656 {
657 return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING,
658 net, sk, skb, NULL, skb_dst(skb)->dev,
659 vrf_finish_output6,
660 !(IP6CB(skb)->flags & IP6SKB_REROUTED));
661 }
662
663 /* set dst on skb to send packet to us via dev_xmit path. Allows
664 * packet to go through device based features such as qdisc, netfilter
665 * hooks and packet sockets with skb->dev set to vrf device.
666 */
vrf_ip6_out_redirect(struct net_device * vrf_dev,struct sk_buff * skb)667 static struct sk_buff *vrf_ip6_out_redirect(struct net_device *vrf_dev,
668 struct sk_buff *skb)
669 {
670 struct net_vrf *vrf = netdev_priv(vrf_dev);
671 struct dst_entry *dst = NULL;
672 struct rt6_info *rt6;
673
674 rcu_read_lock();
675
676 rt6 = rcu_dereference(vrf->rt6);
677 if (likely(rt6)) {
678 dst = &rt6->dst;
679 dst_hold(dst);
680 }
681
682 rcu_read_unlock();
683
684 if (unlikely(!dst)) {
685 vrf_tx_error(vrf_dev, skb);
686 return NULL;
687 }
688
689 skb_dst_drop(skb);
690 skb_dst_set(skb, dst);
691
692 return skb;
693 }
694
vrf_output6_direct_finish(struct net * net,struct sock * sk,struct sk_buff * skb)695 static int vrf_output6_direct_finish(struct net *net, struct sock *sk,
696 struct sk_buff *skb)
697 {
698 vrf_finish_direct(skb);
699
700 return vrf_ip6_local_out(net, sk, skb);
701 }
702
vrf_output6_direct(struct net * net,struct sock * sk,struct sk_buff * skb)703 static int vrf_output6_direct(struct net *net, struct sock *sk,
704 struct sk_buff *skb)
705 {
706 int err = 1;
707
708 skb->protocol = htons(ETH_P_IPV6);
709
710 if (!(IPCB(skb)->flags & IPSKB_REROUTED))
711 err = nf_hook(NFPROTO_IPV6, NF_INET_POST_ROUTING, net, sk, skb,
712 NULL, skb->dev, vrf_output6_direct_finish);
713
714 if (likely(err == 1))
715 vrf_finish_direct(skb);
716
717 return err;
718 }
719
vrf_ip6_out_direct_finish(struct net * net,struct sock * sk,struct sk_buff * skb)720 static int vrf_ip6_out_direct_finish(struct net *net, struct sock *sk,
721 struct sk_buff *skb)
722 {
723 int err;
724
725 err = vrf_output6_direct(net, sk, skb);
726 if (likely(err == 1))
727 err = vrf_ip6_local_out(net, sk, skb);
728
729 return err;
730 }
731
vrf_ip6_out_direct(struct net_device * vrf_dev,struct sock * sk,struct sk_buff * skb)732 static struct sk_buff *vrf_ip6_out_direct(struct net_device *vrf_dev,
733 struct sock *sk,
734 struct sk_buff *skb)
735 {
736 struct net *net = dev_net(vrf_dev);
737 int err;
738
739 skb->dev = vrf_dev;
740
741 err = nf_hook(NFPROTO_IPV6, NF_INET_LOCAL_OUT, net, sk,
742 skb, NULL, vrf_dev, vrf_ip6_out_direct_finish);
743
744 if (likely(err == 1))
745 err = vrf_output6_direct(net, sk, skb);
746
747 if (likely(err == 1))
748 return skb;
749
750 return NULL;
751 }
752
vrf_ip6_out(struct net_device * vrf_dev,struct sock * sk,struct sk_buff * skb)753 static struct sk_buff *vrf_ip6_out(struct net_device *vrf_dev,
754 struct sock *sk,
755 struct sk_buff *skb)
756 {
757 /* don't divert link scope packets */
758 if (rt6_need_strict(&ipv6_hdr(skb)->daddr))
759 return skb;
760
761 vrf_nf_set_untracked(skb);
762
763 if (qdisc_tx_is_default(vrf_dev) ||
764 IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED)
765 return vrf_ip6_out_direct(vrf_dev, sk, skb);
766
767 return vrf_ip6_out_redirect(vrf_dev, skb);
768 }
769
770 /* holding rtnl */
vrf_rt6_release(struct net_device * dev,struct net_vrf * vrf)771 static void vrf_rt6_release(struct net_device *dev, struct net_vrf *vrf)
772 {
773 struct rt6_info *rt6 = rtnl_dereference(vrf->rt6);
774 struct net *net = dev_net(dev);
775 struct dst_entry *dst;
776
777 RCU_INIT_POINTER(vrf->rt6, NULL);
778 synchronize_rcu();
779
780 /* move dev in dst's to loopback so this VRF device can be deleted
781 * - based on dst_ifdown
782 */
783 if (rt6) {
784 dst = &rt6->dst;
785 netdev_ref_replace(dst->dev, net->loopback_dev,
786 &dst->dev_tracker, GFP_KERNEL);
787 dst->dev = net->loopback_dev;
788 dst_release(dst);
789 }
790 }
791
vrf_rt6_create(struct net_device * dev)792 static int vrf_rt6_create(struct net_device *dev)
793 {
794 int flags = DST_NOPOLICY | DST_NOXFRM;
795 struct net_vrf *vrf = netdev_priv(dev);
796 struct net *net = dev_net(dev);
797 struct rt6_info *rt6;
798 int rc = -ENOMEM;
799
800 /* IPv6 can be CONFIG enabled and then disabled runtime */
801 if (!ipv6_mod_enabled())
802 return 0;
803
804 vrf->fib6_table = fib6_new_table(net, vrf->tb_id);
805 if (!vrf->fib6_table)
806 goto out;
807
808 /* create a dst for routing packets out a VRF device */
809 rt6 = ip6_dst_alloc(net, dev, flags);
810 if (!rt6)
811 goto out;
812
813 rt6->dst.output = vrf_output6;
814
815 rcu_assign_pointer(vrf->rt6, rt6);
816
817 rc = 0;
818 out:
819 return rc;
820 }
821 #else
vrf_ip6_out(struct net_device * vrf_dev,struct sock * sk,struct sk_buff * skb)822 static struct sk_buff *vrf_ip6_out(struct net_device *vrf_dev,
823 struct sock *sk,
824 struct sk_buff *skb)
825 {
826 return skb;
827 }
828
vrf_rt6_release(struct net_device * dev,struct net_vrf * vrf)829 static void vrf_rt6_release(struct net_device *dev, struct net_vrf *vrf)
830 {
831 }
832
vrf_rt6_create(struct net_device * dev)833 static int vrf_rt6_create(struct net_device *dev)
834 {
835 return 0;
836 }
837 #endif
838
839 /* modelled after ip_finish_output2 */
vrf_finish_output(struct net * net,struct sock * sk,struct sk_buff * skb)840 static int vrf_finish_output(struct net *net, struct sock *sk, struct sk_buff *skb)
841 {
842 struct dst_entry *dst = skb_dst(skb);
843 struct rtable *rt = dst_rtable(dst);
844 struct net_device *dev = dst->dev;
845 unsigned int hh_len = LL_RESERVED_SPACE(dev);
846 struct neighbour *neigh;
847 bool is_v6gw = false;
848
849 vrf_nf_reset_ct(skb);
850
851 /* Be paranoid, rather than too clever. */
852 if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) {
853 skb = skb_expand_head(skb, hh_len);
854 if (!skb) {
855 dev->stats.tx_errors++;
856 return -ENOMEM;
857 }
858 }
859
860 rcu_read_lock();
861
862 neigh = ip_neigh_for_gw(rt, skb, &is_v6gw);
863 if (!IS_ERR(neigh)) {
864 int ret;
865
866 sock_confirm_neigh(skb, neigh);
867 /* if crossing protocols, can not use the cached header */
868 ret = neigh_output(neigh, skb, is_v6gw);
869 rcu_read_unlock();
870 return ret;
871 }
872
873 rcu_read_unlock();
874 vrf_tx_error(skb->dev, skb);
875 return -EINVAL;
876 }
877
vrf_output(struct net * net,struct sock * sk,struct sk_buff * skb)878 static int vrf_output(struct net *net, struct sock *sk, struct sk_buff *skb)
879 {
880 struct net_device *dev = skb_dst(skb)->dev;
881
882 IP_UPD_PO_STATS(net, IPSTATS_MIB_OUT, skb->len);
883
884 skb->dev = dev;
885 skb->protocol = htons(ETH_P_IP);
886
887 return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING,
888 net, sk, skb, NULL, dev,
889 vrf_finish_output,
890 !(IPCB(skb)->flags & IPSKB_REROUTED));
891 }
892
893 /* set dst on skb to send packet to us via dev_xmit path. Allows
894 * packet to go through device based features such as qdisc, netfilter
895 * hooks and packet sockets with skb->dev set to vrf device.
896 */
vrf_ip_out_redirect(struct net_device * vrf_dev,struct sk_buff * skb)897 static struct sk_buff *vrf_ip_out_redirect(struct net_device *vrf_dev,
898 struct sk_buff *skb)
899 {
900 struct net_vrf *vrf = netdev_priv(vrf_dev);
901 struct dst_entry *dst = NULL;
902 struct rtable *rth;
903
904 rcu_read_lock();
905
906 rth = rcu_dereference(vrf->rth);
907 if (likely(rth)) {
908 dst = &rth->dst;
909 dst_hold(dst);
910 }
911
912 rcu_read_unlock();
913
914 if (unlikely(!dst)) {
915 vrf_tx_error(vrf_dev, skb);
916 return NULL;
917 }
918
919 skb_dst_drop(skb);
920 skb_dst_set(skb, dst);
921
922 return skb;
923 }
924
vrf_output_direct_finish(struct net * net,struct sock * sk,struct sk_buff * skb)925 static int vrf_output_direct_finish(struct net *net, struct sock *sk,
926 struct sk_buff *skb)
927 {
928 vrf_finish_direct(skb);
929
930 return vrf_ip_local_out(net, sk, skb);
931 }
932
vrf_output_direct(struct net * net,struct sock * sk,struct sk_buff * skb)933 static int vrf_output_direct(struct net *net, struct sock *sk,
934 struct sk_buff *skb)
935 {
936 int err = 1;
937
938 skb->protocol = htons(ETH_P_IP);
939
940 if (!(IPCB(skb)->flags & IPSKB_REROUTED))
941 err = nf_hook(NFPROTO_IPV4, NF_INET_POST_ROUTING, net, sk, skb,
942 NULL, skb->dev, vrf_output_direct_finish);
943
944 if (likely(err == 1))
945 vrf_finish_direct(skb);
946
947 return err;
948 }
949
vrf_ip_out_direct_finish(struct net * net,struct sock * sk,struct sk_buff * skb)950 static int vrf_ip_out_direct_finish(struct net *net, struct sock *sk,
951 struct sk_buff *skb)
952 {
953 int err;
954
955 err = vrf_output_direct(net, sk, skb);
956 if (likely(err == 1))
957 err = vrf_ip_local_out(net, sk, skb);
958
959 return err;
960 }
961
vrf_ip_out_direct(struct net_device * vrf_dev,struct sock * sk,struct sk_buff * skb)962 static struct sk_buff *vrf_ip_out_direct(struct net_device *vrf_dev,
963 struct sock *sk,
964 struct sk_buff *skb)
965 {
966 struct net *net = dev_net(vrf_dev);
967 int err;
968
969 skb->dev = vrf_dev;
970
971 err = nf_hook(NFPROTO_IPV4, NF_INET_LOCAL_OUT, net, sk,
972 skb, NULL, vrf_dev, vrf_ip_out_direct_finish);
973
974 if (likely(err == 1))
975 err = vrf_output_direct(net, sk, skb);
976
977 if (likely(err == 1))
978 return skb;
979
980 return NULL;
981 }
982
vrf_ip_out(struct net_device * vrf_dev,struct sock * sk,struct sk_buff * skb)983 static struct sk_buff *vrf_ip_out(struct net_device *vrf_dev,
984 struct sock *sk,
985 struct sk_buff *skb)
986 {
987 /* don't divert multicast or local broadcast */
988 if (ipv4_is_multicast(ip_hdr(skb)->daddr) ||
989 ipv4_is_lbcast(ip_hdr(skb)->daddr))
990 return skb;
991
992 vrf_nf_set_untracked(skb);
993
994 if (qdisc_tx_is_default(vrf_dev) ||
995 IPCB(skb)->flags & IPSKB_XFRM_TRANSFORMED)
996 return vrf_ip_out_direct(vrf_dev, sk, skb);
997
998 return vrf_ip_out_redirect(vrf_dev, skb);
999 }
1000
1001 /* called with rcu lock held */
vrf_l3_out(struct net_device * vrf_dev,struct sock * sk,struct sk_buff * skb,u16 proto)1002 static struct sk_buff *vrf_l3_out(struct net_device *vrf_dev,
1003 struct sock *sk,
1004 struct sk_buff *skb,
1005 u16 proto)
1006 {
1007 switch (proto) {
1008 case AF_INET:
1009 return vrf_ip_out(vrf_dev, sk, skb);
1010 case AF_INET6:
1011 return vrf_ip6_out(vrf_dev, sk, skb);
1012 }
1013
1014 return skb;
1015 }
1016
1017 /* holding rtnl */
vrf_rtable_release(struct net_device * dev,struct net_vrf * vrf)1018 static void vrf_rtable_release(struct net_device *dev, struct net_vrf *vrf)
1019 {
1020 struct rtable *rth = rtnl_dereference(vrf->rth);
1021 struct net *net = dev_net(dev);
1022 struct dst_entry *dst;
1023
1024 RCU_INIT_POINTER(vrf->rth, NULL);
1025 synchronize_rcu();
1026
1027 /* move dev in dst's to loopback so this VRF device can be deleted
1028 * - based on dst_ifdown
1029 */
1030 if (rth) {
1031 dst = &rth->dst;
1032 netdev_ref_replace(dst->dev, net->loopback_dev,
1033 &dst->dev_tracker, GFP_KERNEL);
1034 dst->dev = net->loopback_dev;
1035 dst_release(dst);
1036 }
1037 }
1038
vrf_rtable_create(struct net_device * dev)1039 static int vrf_rtable_create(struct net_device *dev)
1040 {
1041 struct net_vrf *vrf = netdev_priv(dev);
1042 struct rtable *rth;
1043
1044 if (!fib_new_table(dev_net(dev), vrf->tb_id))
1045 return -ENOMEM;
1046
1047 /* create a dst for routing packets out through a VRF device */
1048 rth = rt_dst_alloc(dev, 0, RTN_UNICAST, 1);
1049 if (!rth)
1050 return -ENOMEM;
1051
1052 rth->dst.output = vrf_output;
1053
1054 rcu_assign_pointer(vrf->rth, rth);
1055
1056 return 0;
1057 }
1058
1059 /**************************** device handling ********************/
1060
1061 /* cycle interface to flush neighbor cache and move routes across tables */
cycle_netdev(struct net_device * dev,struct netlink_ext_ack * extack)1062 static void cycle_netdev(struct net_device *dev,
1063 struct netlink_ext_ack *extack)
1064 {
1065 unsigned int flags = dev->flags;
1066 int ret;
1067
1068 if (!netif_running(dev))
1069 return;
1070
1071 ret = dev_change_flags(dev, flags & ~IFF_UP, extack);
1072 if (ret >= 0)
1073 ret = dev_change_flags(dev, flags, extack);
1074
1075 if (ret < 0) {
1076 netdev_err(dev,
1077 "Failed to cycle device %s; route tables might be wrong!\n",
1078 dev->name);
1079 }
1080 }
1081
do_vrf_add_slave(struct net_device * dev,struct net_device * port_dev,struct netlink_ext_ack * extack)1082 static int do_vrf_add_slave(struct net_device *dev, struct net_device *port_dev,
1083 struct netlink_ext_ack *extack)
1084 {
1085 int ret;
1086
1087 /* do not allow loopback device to be enslaved to a VRF.
1088 * The vrf device acts as the loopback for the vrf.
1089 */
1090 if (port_dev == dev_net(dev)->loopback_dev) {
1091 NL_SET_ERR_MSG(extack,
1092 "Can not enslave loopback device to a VRF");
1093 return -EOPNOTSUPP;
1094 }
1095
1096 port_dev->priv_flags |= IFF_L3MDEV_SLAVE;
1097 ret = netdev_master_upper_dev_link(port_dev, dev, NULL, NULL, extack);
1098 if (ret < 0)
1099 goto err;
1100
1101 cycle_netdev(port_dev, extack);
1102
1103 return 0;
1104
1105 err:
1106 port_dev->priv_flags &= ~IFF_L3MDEV_SLAVE;
1107 return ret;
1108 }
1109
vrf_add_slave(struct net_device * dev,struct net_device * port_dev,struct netlink_ext_ack * extack)1110 static int vrf_add_slave(struct net_device *dev, struct net_device *port_dev,
1111 struct netlink_ext_ack *extack)
1112 {
1113 if (netif_is_l3_master(port_dev)) {
1114 NL_SET_ERR_MSG(extack,
1115 "Can not enslave an L3 master device to a VRF");
1116 return -EINVAL;
1117 }
1118
1119 if (netif_is_l3_slave(port_dev))
1120 return -EINVAL;
1121
1122 return do_vrf_add_slave(dev, port_dev, extack);
1123 }
1124
1125 /* inverse of do_vrf_add_slave */
do_vrf_del_slave(struct net_device * dev,struct net_device * port_dev)1126 static int do_vrf_del_slave(struct net_device *dev, struct net_device *port_dev)
1127 {
1128 netdev_upper_dev_unlink(port_dev, dev);
1129 port_dev->priv_flags &= ~IFF_L3MDEV_SLAVE;
1130
1131 cycle_netdev(port_dev, NULL);
1132
1133 return 0;
1134 }
1135
vrf_del_slave(struct net_device * dev,struct net_device * port_dev)1136 static int vrf_del_slave(struct net_device *dev, struct net_device *port_dev)
1137 {
1138 return do_vrf_del_slave(dev, port_dev);
1139 }
1140
vrf_dev_uninit(struct net_device * dev)1141 static void vrf_dev_uninit(struct net_device *dev)
1142 {
1143 struct net_vrf *vrf = netdev_priv(dev);
1144
1145 vrf_rtable_release(dev, vrf);
1146 vrf_rt6_release(dev, vrf);
1147 }
1148
vrf_dev_init(struct net_device * dev)1149 static int vrf_dev_init(struct net_device *dev)
1150 {
1151 struct net_vrf *vrf = netdev_priv(dev);
1152
1153 /* create the default dst which points back to us */
1154 if (vrf_rtable_create(dev) != 0)
1155 goto out_nomem;
1156
1157 if (vrf_rt6_create(dev) != 0)
1158 goto out_rth;
1159
1160 dev->flags = IFF_MASTER | IFF_NOARP;
1161
1162 /* similarly, oper state is irrelevant; set to up to avoid confusion */
1163 dev->operstate = IF_OPER_UP;
1164 netdev_lockdep_set_classes(dev);
1165 return 0;
1166
1167 out_rth:
1168 vrf_rtable_release(dev, vrf);
1169 out_nomem:
1170 return -ENOMEM;
1171 }
1172
1173 static const struct net_device_ops vrf_netdev_ops = {
1174 .ndo_init = vrf_dev_init,
1175 .ndo_uninit = vrf_dev_uninit,
1176 .ndo_start_xmit = vrf_xmit,
1177 .ndo_set_mac_address = eth_mac_addr,
1178 .ndo_add_slave = vrf_add_slave,
1179 .ndo_del_slave = vrf_del_slave,
1180 };
1181
vrf_fib_table(const struct net_device * dev)1182 static u32 vrf_fib_table(const struct net_device *dev)
1183 {
1184 struct net_vrf *vrf = netdev_priv(dev);
1185
1186 return vrf->tb_id;
1187 }
1188
vrf_rcv_finish(struct net * net,struct sock * sk,struct sk_buff * skb)1189 static int vrf_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb)
1190 {
1191 kfree_skb(skb);
1192 return 0;
1193 }
1194
vrf_rcv_nfhook(u8 pf,unsigned int hook,struct sk_buff * skb,struct net_device * dev)1195 static struct sk_buff *vrf_rcv_nfhook(u8 pf, unsigned int hook,
1196 struct sk_buff *skb,
1197 struct net_device *dev)
1198 {
1199 struct net *net = dev_net(dev);
1200
1201 if (nf_hook(pf, hook, net, NULL, skb, dev, NULL, vrf_rcv_finish) != 1)
1202 skb = NULL; /* kfree_skb(skb) handled by nf code */
1203
1204 return skb;
1205 }
1206
vrf_prepare_mac_header(struct sk_buff * skb,struct net_device * vrf_dev,u16 proto)1207 static int vrf_prepare_mac_header(struct sk_buff *skb,
1208 struct net_device *vrf_dev, u16 proto)
1209 {
1210 struct ethhdr *eth;
1211 int err;
1212
1213 /* in general, we do not know if there is enough space in the head of
1214 * the packet for hosting the mac header.
1215 */
1216 err = skb_cow_head(skb, LL_RESERVED_SPACE(vrf_dev));
1217 if (unlikely(err))
1218 /* no space in the skb head */
1219 return -ENOBUFS;
1220
1221 __skb_push(skb, ETH_HLEN);
1222 eth = (struct ethhdr *)skb->data;
1223
1224 skb_reset_mac_header(skb);
1225 skb_reset_mac_len(skb);
1226
1227 /* we set the ethernet destination and the source addresses to the
1228 * address of the VRF device.
1229 */
1230 ether_addr_copy(eth->h_dest, vrf_dev->dev_addr);
1231 ether_addr_copy(eth->h_source, vrf_dev->dev_addr);
1232 eth->h_proto = htons(proto);
1233
1234 /* the destination address of the Ethernet frame corresponds to the
1235 * address set on the VRF interface; therefore, the packet is intended
1236 * to be processed locally.
1237 */
1238 skb->protocol = eth->h_proto;
1239 skb->pkt_type = PACKET_HOST;
1240
1241 skb_postpush_rcsum(skb, skb->data, ETH_HLEN);
1242
1243 skb_pull_inline(skb, ETH_HLEN);
1244
1245 return 0;
1246 }
1247
1248 /* prepare and add the mac header to the packet if it was not set previously.
1249 * In this way, packet sniffers such as tcpdump can parse the packet correctly.
1250 * If the mac header was already set, the original mac header is left
1251 * untouched and the function returns immediately.
1252 */
vrf_add_mac_header_if_unset(struct sk_buff * skb,struct net_device * vrf_dev,u16 proto,struct net_device * orig_dev)1253 static int vrf_add_mac_header_if_unset(struct sk_buff *skb,
1254 struct net_device *vrf_dev,
1255 u16 proto, struct net_device *orig_dev)
1256 {
1257 if (skb_mac_header_was_set(skb) && dev_has_header(orig_dev))
1258 return 0;
1259
1260 return vrf_prepare_mac_header(skb, vrf_dev, proto);
1261 }
1262
1263 #if IS_ENABLED(CONFIG_IPV6)
1264 /* neighbor handling is done with actual device; do not want
1265 * to flip skb->dev for those ndisc packets. This really fails
1266 * for multiple next protocols (e.g., NEXTHDR_HOP). But it is
1267 * a start.
1268 */
ipv6_ndisc_frame(const struct sk_buff * skb)1269 static bool ipv6_ndisc_frame(const struct sk_buff *skb)
1270 {
1271 const struct ipv6hdr *iph = ipv6_hdr(skb);
1272 bool rc = false;
1273
1274 if (iph->nexthdr == NEXTHDR_ICMP) {
1275 const struct icmp6hdr *icmph;
1276 struct icmp6hdr _icmph;
1277
1278 icmph = skb_header_pointer(skb, sizeof(*iph),
1279 sizeof(_icmph), &_icmph);
1280 if (!icmph)
1281 goto out;
1282
1283 switch (icmph->icmp6_type) {
1284 case NDISC_ROUTER_SOLICITATION:
1285 case NDISC_ROUTER_ADVERTISEMENT:
1286 case NDISC_NEIGHBOUR_SOLICITATION:
1287 case NDISC_NEIGHBOUR_ADVERTISEMENT:
1288 case NDISC_REDIRECT:
1289 rc = true;
1290 break;
1291 }
1292 }
1293
1294 out:
1295 return rc;
1296 }
1297
vrf_ip6_route_lookup(struct net * net,const struct net_device * dev,struct flowi6 * fl6,int ifindex,const struct sk_buff * skb,int flags)1298 static struct rt6_info *vrf_ip6_route_lookup(struct net *net,
1299 const struct net_device *dev,
1300 struct flowi6 *fl6,
1301 int ifindex,
1302 const struct sk_buff *skb,
1303 int flags)
1304 {
1305 struct net_vrf *vrf = netdev_priv(dev);
1306
1307 return ip6_pol_route(net, vrf->fib6_table, ifindex, fl6, skb, flags);
1308 }
1309
vrf_ip6_input_dst(struct sk_buff * skb,struct net_device * vrf_dev,int ifindex)1310 static void vrf_ip6_input_dst(struct sk_buff *skb, struct net_device *vrf_dev,
1311 int ifindex)
1312 {
1313 const struct ipv6hdr *iph = ipv6_hdr(skb);
1314 struct flowi6 fl6 = {
1315 .flowi6_iif = ifindex,
1316 .flowi6_mark = skb->mark,
1317 .flowi6_proto = iph->nexthdr,
1318 .daddr = iph->daddr,
1319 .saddr = iph->saddr,
1320 .flowlabel = ip6_flowinfo(iph),
1321 };
1322 struct net *net = dev_net(vrf_dev);
1323 struct rt6_info *rt6;
1324
1325 rt6 = vrf_ip6_route_lookup(net, vrf_dev, &fl6, ifindex, skb,
1326 RT6_LOOKUP_F_HAS_SADDR | RT6_LOOKUP_F_IFACE);
1327 if (unlikely(!rt6))
1328 return;
1329
1330 if (unlikely(&rt6->dst == &net->ipv6.ip6_null_entry->dst))
1331 return;
1332
1333 skb_dst_set(skb, &rt6->dst);
1334 }
1335
vrf_ip6_rcv(struct net_device * vrf_dev,struct sk_buff * skb)1336 static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev,
1337 struct sk_buff *skb)
1338 {
1339 int orig_iif = skb->skb_iif;
1340 bool need_strict = rt6_need_strict(&ipv6_hdr(skb)->daddr);
1341 bool is_ndisc = ipv6_ndisc_frame(skb);
1342
1343 /* loopback, multicast & non-ND link-local traffic; do not push through
1344 * packet taps again. Reset pkt_type for upper layers to process skb.
1345 * For non-loopback strict packets, determine the dst using the original
1346 * ifindex.
1347 */
1348 if (skb->pkt_type == PACKET_LOOPBACK || (need_strict && !is_ndisc)) {
1349 skb->dev = vrf_dev;
1350 skb->skb_iif = vrf_dev->ifindex;
1351 IP6CB(skb)->flags |= IP6SKB_L3SLAVE;
1352
1353 if (skb->pkt_type == PACKET_LOOPBACK)
1354 skb->pkt_type = PACKET_HOST;
1355 else
1356 vrf_ip6_input_dst(skb, vrf_dev, orig_iif);
1357
1358 goto out;
1359 }
1360
1361 /* if packet is NDISC then keep the ingress interface */
1362 if (!is_ndisc) {
1363 struct net_device *orig_dev = skb->dev;
1364
1365 vrf_rx_stats(vrf_dev, skb->len);
1366 skb->dev = vrf_dev;
1367 skb->skb_iif = vrf_dev->ifindex;
1368
1369 if (!list_empty(&vrf_dev->ptype_all)) {
1370 int err;
1371
1372 err = vrf_add_mac_header_if_unset(skb, vrf_dev,
1373 ETH_P_IPV6,
1374 orig_dev);
1375 if (likely(!err)) {
1376 skb_push(skb, skb->mac_len);
1377 dev_queue_xmit_nit(skb, vrf_dev);
1378 skb_pull(skb, skb->mac_len);
1379 }
1380 }
1381
1382 IP6CB(skb)->flags |= IP6SKB_L3SLAVE;
1383 }
1384
1385 if (need_strict)
1386 vrf_ip6_input_dst(skb, vrf_dev, orig_iif);
1387
1388 skb = vrf_rcv_nfhook(NFPROTO_IPV6, NF_INET_PRE_ROUTING, skb, vrf_dev);
1389 out:
1390 return skb;
1391 }
1392
1393 #else
vrf_ip6_rcv(struct net_device * vrf_dev,struct sk_buff * skb)1394 static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev,
1395 struct sk_buff *skb)
1396 {
1397 return skb;
1398 }
1399 #endif
1400
vrf_ip_rcv(struct net_device * vrf_dev,struct sk_buff * skb)1401 static struct sk_buff *vrf_ip_rcv(struct net_device *vrf_dev,
1402 struct sk_buff *skb)
1403 {
1404 struct net_device *orig_dev = skb->dev;
1405
1406 skb->dev = vrf_dev;
1407 skb->skb_iif = vrf_dev->ifindex;
1408 IPCB(skb)->flags |= IPSKB_L3SLAVE;
1409
1410 if (ipv4_is_multicast(ip_hdr(skb)->daddr))
1411 goto out;
1412
1413 /* loopback traffic; do not push through packet taps again.
1414 * Reset pkt_type for upper layers to process skb
1415 */
1416 if (skb->pkt_type == PACKET_LOOPBACK) {
1417 skb->pkt_type = PACKET_HOST;
1418 goto out;
1419 }
1420
1421 vrf_rx_stats(vrf_dev, skb->len);
1422
1423 if (!list_empty(&vrf_dev->ptype_all)) {
1424 int err;
1425
1426 err = vrf_add_mac_header_if_unset(skb, vrf_dev, ETH_P_IP,
1427 orig_dev);
1428 if (likely(!err)) {
1429 skb_push(skb, skb->mac_len);
1430 dev_queue_xmit_nit(skb, vrf_dev);
1431 skb_pull(skb, skb->mac_len);
1432 }
1433 }
1434
1435 skb = vrf_rcv_nfhook(NFPROTO_IPV4, NF_INET_PRE_ROUTING, skb, vrf_dev);
1436 out:
1437 return skb;
1438 }
1439
1440 /* called with rcu lock held */
vrf_l3_rcv(struct net_device * vrf_dev,struct sk_buff * skb,u16 proto)1441 static struct sk_buff *vrf_l3_rcv(struct net_device *vrf_dev,
1442 struct sk_buff *skb,
1443 u16 proto)
1444 {
1445 switch (proto) {
1446 case AF_INET:
1447 return vrf_ip_rcv(vrf_dev, skb);
1448 case AF_INET6:
1449 return vrf_ip6_rcv(vrf_dev, skb);
1450 }
1451
1452 return skb;
1453 }
1454
1455 #if IS_ENABLED(CONFIG_IPV6)
1456 /* send to link-local or multicast address via interface enslaved to
1457 * VRF device. Force lookup to VRF table without changing flow struct
1458 * Note: Caller to this function must hold rcu_read_lock() and no refcnt
1459 * is taken on the dst by this function.
1460 */
vrf_link_scope_lookup(const struct net_device * dev,struct flowi6 * fl6)1461 static struct dst_entry *vrf_link_scope_lookup(const struct net_device *dev,
1462 struct flowi6 *fl6)
1463 {
1464 struct net *net = dev_net(dev);
1465 int flags = RT6_LOOKUP_F_IFACE | RT6_LOOKUP_F_DST_NOREF;
1466 struct dst_entry *dst = NULL;
1467 struct rt6_info *rt;
1468
1469 /* VRF device does not have a link-local address and
1470 * sending packets to link-local or mcast addresses over
1471 * a VRF device does not make sense
1472 */
1473 if (fl6->flowi6_oif == dev->ifindex) {
1474 dst = &net->ipv6.ip6_null_entry->dst;
1475 return dst;
1476 }
1477
1478 if (!ipv6_addr_any(&fl6->saddr))
1479 flags |= RT6_LOOKUP_F_HAS_SADDR;
1480
1481 rt = vrf_ip6_route_lookup(net, dev, fl6, fl6->flowi6_oif, NULL, flags);
1482 if (rt)
1483 dst = &rt->dst;
1484
1485 return dst;
1486 }
1487 #endif
1488
1489 static const struct l3mdev_ops vrf_l3mdev_ops = {
1490 .l3mdev_fib_table = vrf_fib_table,
1491 .l3mdev_l3_rcv = vrf_l3_rcv,
1492 .l3mdev_l3_out = vrf_l3_out,
1493 #if IS_ENABLED(CONFIG_IPV6)
1494 .l3mdev_link_scope_lookup = vrf_link_scope_lookup,
1495 #endif
1496 };
1497
vrf_get_drvinfo(struct net_device * dev,struct ethtool_drvinfo * info)1498 static void vrf_get_drvinfo(struct net_device *dev,
1499 struct ethtool_drvinfo *info)
1500 {
1501 strscpy(info->driver, DRV_NAME, sizeof(info->driver));
1502 strscpy(info->version, DRV_VERSION, sizeof(info->version));
1503 }
1504
1505 static const struct ethtool_ops vrf_ethtool_ops = {
1506 .get_drvinfo = vrf_get_drvinfo,
1507 };
1508
vrf_fib_rule_nl_size(void)1509 static inline size_t vrf_fib_rule_nl_size(void)
1510 {
1511 size_t sz;
1512
1513 sz = NLMSG_ALIGN(sizeof(struct fib_rule_hdr));
1514 sz += nla_total_size(sizeof(u8)); /* FRA_L3MDEV */
1515 sz += nla_total_size(sizeof(u32)); /* FRA_PRIORITY */
1516 sz += nla_total_size(sizeof(u8)); /* FRA_PROTOCOL */
1517
1518 return sz;
1519 }
1520
vrf_fib_rule(const struct net_device * dev,__u8 family,bool add_it)1521 static int vrf_fib_rule(const struct net_device *dev, __u8 family, bool add_it)
1522 {
1523 struct fib_rule_hdr *frh;
1524 struct nlmsghdr *nlh;
1525 struct sk_buff *skb;
1526 int err;
1527
1528 if ((family == AF_INET6 || family == RTNL_FAMILY_IP6MR) &&
1529 !ipv6_mod_enabled())
1530 return 0;
1531
1532 skb = nlmsg_new(vrf_fib_rule_nl_size(), GFP_KERNEL);
1533 if (!skb)
1534 return -ENOMEM;
1535
1536 nlh = nlmsg_put(skb, 0, 0, 0, sizeof(*frh), 0);
1537 if (!nlh)
1538 goto nla_put_failure;
1539
1540 /* rule only needs to appear once */
1541 nlh->nlmsg_flags |= NLM_F_EXCL;
1542
1543 frh = nlmsg_data(nlh);
1544 memset(frh, 0, sizeof(*frh));
1545 frh->family = family;
1546 frh->action = FR_ACT_TO_TBL;
1547
1548 if (nla_put_u8(skb, FRA_PROTOCOL, RTPROT_KERNEL))
1549 goto nla_put_failure;
1550
1551 if (nla_put_u8(skb, FRA_L3MDEV, 1))
1552 goto nla_put_failure;
1553
1554 if (nla_put_u32(skb, FRA_PRIORITY, FIB_RULE_PREF))
1555 goto nla_put_failure;
1556
1557 nlmsg_end(skb, nlh);
1558
1559 /* fib_nl_{new,del}rule handling looks for net from skb->sk */
1560 skb->sk = dev_net(dev)->rtnl;
1561 if (add_it) {
1562 err = fib_nl_newrule(skb, nlh, NULL);
1563 if (err == -EEXIST)
1564 err = 0;
1565 } else {
1566 err = fib_nl_delrule(skb, nlh, NULL);
1567 if (err == -ENOENT)
1568 err = 0;
1569 }
1570 nlmsg_free(skb);
1571
1572 return err;
1573
1574 nla_put_failure:
1575 nlmsg_free(skb);
1576
1577 return -EMSGSIZE;
1578 }
1579
vrf_add_fib_rules(const struct net_device * dev)1580 static int vrf_add_fib_rules(const struct net_device *dev)
1581 {
1582 int err;
1583
1584 err = vrf_fib_rule(dev, AF_INET, true);
1585 if (err < 0)
1586 goto out_err;
1587
1588 err = vrf_fib_rule(dev, AF_INET6, true);
1589 if (err < 0)
1590 goto ipv6_err;
1591
1592 #if IS_ENABLED(CONFIG_IP_MROUTE_MULTIPLE_TABLES)
1593 err = vrf_fib_rule(dev, RTNL_FAMILY_IPMR, true);
1594 if (err < 0)
1595 goto ipmr_err;
1596 #endif
1597
1598 #if IS_ENABLED(CONFIG_IPV6_MROUTE_MULTIPLE_TABLES)
1599 err = vrf_fib_rule(dev, RTNL_FAMILY_IP6MR, true);
1600 if (err < 0)
1601 goto ip6mr_err;
1602 #endif
1603
1604 return 0;
1605
1606 #if IS_ENABLED(CONFIG_IPV6_MROUTE_MULTIPLE_TABLES)
1607 ip6mr_err:
1608 vrf_fib_rule(dev, RTNL_FAMILY_IPMR, false);
1609 #endif
1610
1611 #if IS_ENABLED(CONFIG_IP_MROUTE_MULTIPLE_TABLES)
1612 ipmr_err:
1613 vrf_fib_rule(dev, AF_INET6, false);
1614 #endif
1615
1616 ipv6_err:
1617 vrf_fib_rule(dev, AF_INET, false);
1618
1619 out_err:
1620 netdev_err(dev, "Failed to add FIB rules.\n");
1621 return err;
1622 }
1623
vrf_setup(struct net_device * dev)1624 static void vrf_setup(struct net_device *dev)
1625 {
1626 ether_setup(dev);
1627
1628 /* Initialize the device structure. */
1629 dev->netdev_ops = &vrf_netdev_ops;
1630 dev->l3mdev_ops = &vrf_l3mdev_ops;
1631 dev->ethtool_ops = &vrf_ethtool_ops;
1632 dev->needs_free_netdev = true;
1633
1634 /* Fill in device structure with ethernet-generic values. */
1635 eth_hw_addr_random(dev);
1636
1637 /* don't acquire vrf device's netif_tx_lock when transmitting */
1638 dev->lltx = true;
1639
1640 /* don't allow vrf devices to change network namespaces. */
1641 dev->netns_local = true;
1642
1643 /* does not make sense for a VLAN to be added to a vrf device */
1644 dev->features |= NETIF_F_VLAN_CHALLENGED;
1645
1646 /* enable offload features */
1647 dev->features |= NETIF_F_GSO_SOFTWARE;
1648 dev->features |= NETIF_F_RXCSUM | NETIF_F_HW_CSUM | NETIF_F_SCTP_CRC;
1649 dev->features |= NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA;
1650
1651 dev->hw_features = dev->features;
1652 dev->hw_enc_features = dev->features;
1653
1654 /* default to no qdisc; user can add if desired */
1655 dev->priv_flags |= IFF_NO_QUEUE;
1656 dev->priv_flags |= IFF_NO_RX_HANDLER;
1657 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1658
1659 /* VRF devices do not care about MTU, but if the MTU is set
1660 * too low then the ipv4 and ipv6 protocols are disabled
1661 * which breaks networking.
1662 */
1663 dev->min_mtu = IPV6_MIN_MTU;
1664 dev->max_mtu = IP6_MAX_MTU;
1665 dev->mtu = dev->max_mtu;
1666
1667 dev->pcpu_stat_type = NETDEV_PCPU_STAT_DSTATS;
1668 }
1669
vrf_validate(struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)1670 static int vrf_validate(struct nlattr *tb[], struct nlattr *data[],
1671 struct netlink_ext_ack *extack)
1672 {
1673 if (tb[IFLA_ADDRESS]) {
1674 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
1675 NL_SET_ERR_MSG(extack, "Invalid hardware address");
1676 return -EINVAL;
1677 }
1678 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
1679 NL_SET_ERR_MSG(extack, "Invalid hardware address");
1680 return -EADDRNOTAVAIL;
1681 }
1682 }
1683 return 0;
1684 }
1685
vrf_dellink(struct net_device * dev,struct list_head * head)1686 static void vrf_dellink(struct net_device *dev, struct list_head *head)
1687 {
1688 struct net_device *port_dev;
1689 struct list_head *iter;
1690
1691 netdev_for_each_lower_dev(dev, port_dev, iter)
1692 vrf_del_slave(dev, port_dev);
1693
1694 vrf_map_unregister_dev(dev);
1695
1696 unregister_netdevice_queue(dev, head);
1697 }
1698
vrf_newlink(struct net * src_net,struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)1699 static int vrf_newlink(struct net *src_net, struct net_device *dev,
1700 struct nlattr *tb[], struct nlattr *data[],
1701 struct netlink_ext_ack *extack)
1702 {
1703 struct net_vrf *vrf = netdev_priv(dev);
1704 struct netns_vrf *nn_vrf;
1705 bool *add_fib_rules;
1706 struct net *net;
1707 int err;
1708
1709 if (!data || !data[IFLA_VRF_TABLE]) {
1710 NL_SET_ERR_MSG(extack, "VRF table id is missing");
1711 return -EINVAL;
1712 }
1713
1714 vrf->tb_id = nla_get_u32(data[IFLA_VRF_TABLE]);
1715 if (vrf->tb_id == RT_TABLE_UNSPEC) {
1716 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VRF_TABLE],
1717 "Invalid VRF table id");
1718 return -EINVAL;
1719 }
1720
1721 dev->priv_flags |= IFF_L3MDEV_MASTER;
1722
1723 err = register_netdevice(dev);
1724 if (err)
1725 goto out;
1726
1727 /* mapping between table_id and vrf;
1728 * note: such binding could not be done in the dev init function
1729 * because dev->ifindex id is not available yet.
1730 */
1731 vrf->ifindex = dev->ifindex;
1732
1733 err = vrf_map_register_dev(dev, extack);
1734 if (err) {
1735 unregister_netdevice(dev);
1736 goto out;
1737 }
1738
1739 net = dev_net(dev);
1740 nn_vrf = net_generic(net, vrf_net_id);
1741
1742 add_fib_rules = &nn_vrf->add_fib_rules;
1743 if (*add_fib_rules) {
1744 err = vrf_add_fib_rules(dev);
1745 if (err) {
1746 vrf_map_unregister_dev(dev);
1747 unregister_netdevice(dev);
1748 goto out;
1749 }
1750 *add_fib_rules = false;
1751 }
1752
1753 out:
1754 return err;
1755 }
1756
vrf_nl_getsize(const struct net_device * dev)1757 static size_t vrf_nl_getsize(const struct net_device *dev)
1758 {
1759 return nla_total_size(sizeof(u32)); /* IFLA_VRF_TABLE */
1760 }
1761
vrf_fillinfo(struct sk_buff * skb,const struct net_device * dev)1762 static int vrf_fillinfo(struct sk_buff *skb,
1763 const struct net_device *dev)
1764 {
1765 struct net_vrf *vrf = netdev_priv(dev);
1766
1767 return nla_put_u32(skb, IFLA_VRF_TABLE, vrf->tb_id);
1768 }
1769
vrf_get_slave_size(const struct net_device * bond_dev,const struct net_device * slave_dev)1770 static size_t vrf_get_slave_size(const struct net_device *bond_dev,
1771 const struct net_device *slave_dev)
1772 {
1773 return nla_total_size(sizeof(u32)); /* IFLA_VRF_PORT_TABLE */
1774 }
1775
vrf_fill_slave_info(struct sk_buff * skb,const struct net_device * vrf_dev,const struct net_device * slave_dev)1776 static int vrf_fill_slave_info(struct sk_buff *skb,
1777 const struct net_device *vrf_dev,
1778 const struct net_device *slave_dev)
1779 {
1780 struct net_vrf *vrf = netdev_priv(vrf_dev);
1781
1782 if (nla_put_u32(skb, IFLA_VRF_PORT_TABLE, vrf->tb_id))
1783 return -EMSGSIZE;
1784
1785 return 0;
1786 }
1787
1788 static const struct nla_policy vrf_nl_policy[IFLA_VRF_MAX + 1] = {
1789 [IFLA_VRF_TABLE] = { .type = NLA_U32 },
1790 };
1791
1792 static struct rtnl_link_ops vrf_link_ops __read_mostly = {
1793 .kind = DRV_NAME,
1794 .priv_size = sizeof(struct net_vrf),
1795
1796 .get_size = vrf_nl_getsize,
1797 .policy = vrf_nl_policy,
1798 .validate = vrf_validate,
1799 .fill_info = vrf_fillinfo,
1800
1801 .get_slave_size = vrf_get_slave_size,
1802 .fill_slave_info = vrf_fill_slave_info,
1803
1804 .newlink = vrf_newlink,
1805 .dellink = vrf_dellink,
1806 .setup = vrf_setup,
1807 .maxtype = IFLA_VRF_MAX,
1808 };
1809
vrf_device_event(struct notifier_block * unused,unsigned long event,void * ptr)1810 static int vrf_device_event(struct notifier_block *unused,
1811 unsigned long event, void *ptr)
1812 {
1813 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1814
1815 /* only care about unregister events to drop slave references */
1816 if (event == NETDEV_UNREGISTER) {
1817 struct net_device *vrf_dev;
1818
1819 if (!netif_is_l3_slave(dev))
1820 goto out;
1821
1822 vrf_dev = netdev_master_upper_dev_get(dev);
1823 vrf_del_slave(vrf_dev, dev);
1824 }
1825 out:
1826 return NOTIFY_DONE;
1827 }
1828
1829 static struct notifier_block vrf_notifier_block __read_mostly = {
1830 .notifier_call = vrf_device_event,
1831 };
1832
vrf_map_init(struct vrf_map * vmap)1833 static int vrf_map_init(struct vrf_map *vmap)
1834 {
1835 spin_lock_init(&vmap->vmap_lock);
1836 hash_init(vmap->ht);
1837
1838 vmap->strict_mode = false;
1839
1840 return 0;
1841 }
1842
1843 #ifdef CONFIG_SYSCTL
vrf_strict_mode(struct vrf_map * vmap)1844 static bool vrf_strict_mode(struct vrf_map *vmap)
1845 {
1846 bool strict_mode;
1847
1848 vrf_map_lock(vmap);
1849 strict_mode = vmap->strict_mode;
1850 vrf_map_unlock(vmap);
1851
1852 return strict_mode;
1853 }
1854
vrf_strict_mode_change(struct vrf_map * vmap,bool new_mode)1855 static int vrf_strict_mode_change(struct vrf_map *vmap, bool new_mode)
1856 {
1857 bool *cur_mode;
1858 int res = 0;
1859
1860 vrf_map_lock(vmap);
1861
1862 cur_mode = &vmap->strict_mode;
1863 if (*cur_mode == new_mode)
1864 goto unlock;
1865
1866 if (*cur_mode) {
1867 /* disable strict mode */
1868 *cur_mode = false;
1869 } else {
1870 if (vmap->shared_tables) {
1871 /* we cannot allow strict_mode because there are some
1872 * vrfs that share one or more tables.
1873 */
1874 res = -EBUSY;
1875 goto unlock;
1876 }
1877
1878 /* no tables are shared among vrfs, so we can go back
1879 * to 1:1 association between a vrf with its table.
1880 */
1881 *cur_mode = true;
1882 }
1883
1884 unlock:
1885 vrf_map_unlock(vmap);
1886
1887 return res;
1888 }
1889
vrf_shared_table_handler(const struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)1890 static int vrf_shared_table_handler(const struct ctl_table *table, int write,
1891 void *buffer, size_t *lenp, loff_t *ppos)
1892 {
1893 struct net *net = (struct net *)table->extra1;
1894 struct vrf_map *vmap = netns_vrf_map(net);
1895 int proc_strict_mode = 0;
1896 struct ctl_table tmp = {
1897 .procname = table->procname,
1898 .data = &proc_strict_mode,
1899 .maxlen = sizeof(int),
1900 .mode = table->mode,
1901 .extra1 = SYSCTL_ZERO,
1902 .extra2 = SYSCTL_ONE,
1903 };
1904 int ret;
1905
1906 if (!write)
1907 proc_strict_mode = vrf_strict_mode(vmap);
1908
1909 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
1910
1911 if (write && ret == 0)
1912 ret = vrf_strict_mode_change(vmap, (bool)proc_strict_mode);
1913
1914 return ret;
1915 }
1916
1917 static const struct ctl_table vrf_table[] = {
1918 {
1919 .procname = "strict_mode",
1920 .data = NULL,
1921 .maxlen = sizeof(int),
1922 .mode = 0644,
1923 .proc_handler = vrf_shared_table_handler,
1924 /* set by the vrf_netns_init */
1925 .extra1 = NULL,
1926 },
1927 };
1928
vrf_netns_init_sysctl(struct net * net,struct netns_vrf * nn_vrf)1929 static int vrf_netns_init_sysctl(struct net *net, struct netns_vrf *nn_vrf)
1930 {
1931 struct ctl_table *table;
1932
1933 table = kmemdup(vrf_table, sizeof(vrf_table), GFP_KERNEL);
1934 if (!table)
1935 return -ENOMEM;
1936
1937 /* init the extra1 parameter with the reference to current netns */
1938 table[0].extra1 = net;
1939
1940 nn_vrf->ctl_hdr = register_net_sysctl_sz(net, "net/vrf", table,
1941 ARRAY_SIZE(vrf_table));
1942 if (!nn_vrf->ctl_hdr) {
1943 kfree(table);
1944 return -ENOMEM;
1945 }
1946
1947 return 0;
1948 }
1949
vrf_netns_exit_sysctl(struct net * net)1950 static void vrf_netns_exit_sysctl(struct net *net)
1951 {
1952 struct netns_vrf *nn_vrf = net_generic(net, vrf_net_id);
1953 const struct ctl_table *table;
1954
1955 table = nn_vrf->ctl_hdr->ctl_table_arg;
1956 unregister_net_sysctl_table(nn_vrf->ctl_hdr);
1957 kfree(table);
1958 }
1959 #else
vrf_netns_init_sysctl(struct net * net,struct netns_vrf * nn_vrf)1960 static int vrf_netns_init_sysctl(struct net *net, struct netns_vrf *nn_vrf)
1961 {
1962 return 0;
1963 }
1964
vrf_netns_exit_sysctl(struct net * net)1965 static void vrf_netns_exit_sysctl(struct net *net)
1966 {
1967 }
1968 #endif
1969
1970 /* Initialize per network namespace state */
vrf_netns_init(struct net * net)1971 static int __net_init vrf_netns_init(struct net *net)
1972 {
1973 struct netns_vrf *nn_vrf = net_generic(net, vrf_net_id);
1974
1975 nn_vrf->add_fib_rules = true;
1976 vrf_map_init(&nn_vrf->vmap);
1977
1978 return vrf_netns_init_sysctl(net, nn_vrf);
1979 }
1980
vrf_netns_exit(struct net * net)1981 static void __net_exit vrf_netns_exit(struct net *net)
1982 {
1983 vrf_netns_exit_sysctl(net);
1984 }
1985
1986 static struct pernet_operations vrf_net_ops __net_initdata = {
1987 .init = vrf_netns_init,
1988 .exit = vrf_netns_exit,
1989 .id = &vrf_net_id,
1990 .size = sizeof(struct netns_vrf),
1991 };
1992
vrf_init_module(void)1993 static int __init vrf_init_module(void)
1994 {
1995 int rc;
1996
1997 register_netdevice_notifier(&vrf_notifier_block);
1998
1999 rc = register_pernet_subsys(&vrf_net_ops);
2000 if (rc < 0)
2001 goto error;
2002
2003 rc = l3mdev_table_lookup_register(L3MDEV_TYPE_VRF,
2004 vrf_ifindex_lookup_by_table_id);
2005 if (rc < 0)
2006 goto unreg_pernet;
2007
2008 rc = rtnl_link_register(&vrf_link_ops);
2009 if (rc < 0)
2010 goto table_lookup_unreg;
2011
2012 return 0;
2013
2014 table_lookup_unreg:
2015 l3mdev_table_lookup_unregister(L3MDEV_TYPE_VRF,
2016 vrf_ifindex_lookup_by_table_id);
2017
2018 unreg_pernet:
2019 unregister_pernet_subsys(&vrf_net_ops);
2020
2021 error:
2022 unregister_netdevice_notifier(&vrf_notifier_block);
2023 return rc;
2024 }
2025
2026 module_init(vrf_init_module);
2027 MODULE_AUTHOR("Shrijeet Mukherjee, David Ahern");
2028 MODULE_DESCRIPTION("Device driver to instantiate VRF domains");
2029 MODULE_LICENSE("GPL");
2030 MODULE_ALIAS_RTNL_LINK(DRV_NAME);
2031 MODULE_VERSION(DRV_VERSION);
2032