Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
193125db DA |
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 | |
193125db DA |
10 | */ |
11 | ||
cc69837f | 12 | #include <linux/ethtool.h> |
193125db DA |
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> | |
c8baec38 | 25 | #include <linux/spinlock_types.h> |
193125db DA |
26 | |
27 | #include <linux/inetdevice.h> | |
8f58336d | 28 | #include <net/arp.h> |
193125db DA |
29 | #include <net/ip.h> |
30 | #include <net/ip_fib.h> | |
35402e31 | 31 | #include <net/ip6_fib.h> |
193125db | 32 | #include <net/ip6_route.h> |
193125db DA |
33 | #include <net/route.h> |
34 | #include <net/addrconf.h> | |
ee15ee5d | 35 | #include <net/l3mdev.h> |
1aa6c4f6 | 36 | #include <net/fib_rules.h> |
b6459415 | 37 | #include <net/sch_generic.h> |
097d3c95 | 38 | #include <net/netns/generic.h> |
8c9c296a | 39 | #include <net/netfilter/nf_conntrack.h> |
193125db DA |
40 | |
41 | #define DRV_NAME "vrf" | |
c8baec38 | 42 | #define DRV_VERSION "1.1" |
193125db | 43 | |
1aa6c4f6 | 44 | #define FIB_RULE_PREF 1000 /* default preference for FIB rules */ |
097d3c95 | 45 | |
c8baec38 AM |
46 | #define HT_MAP_BITS 4 |
47 | #define HASH_INITVAL ((u32)0xcafef00d) | |
48 | ||
49 | struct vrf_map { | |
50 | DECLARE_HASHTABLE(ht, HT_MAP_BITS); | |
51 | spinlock_t vmap_lock; | |
52 | ||
53 | /* shared_tables: | |
54 | * count how many distinct tables do not comply with the strict mode | |
55 | * requirement. | |
56 | * shared_tables value must be 0 in order to enable the strict mode. | |
57 | * | |
58 | * example of the evolution of shared_tables: | |
59 | * | time | |
60 | * add vrf0 --> table 100 shared_tables = 0 | t0 | |
61 | * add vrf1 --> table 101 shared_tables = 0 | t1 | |
62 | * add vrf2 --> table 100 shared_tables = 1 | t2 | |
63 | * add vrf3 --> table 100 shared_tables = 1 | t3 | |
64 | * add vrf4 --> table 101 shared_tables = 2 v t4 | |
65 | * | |
66 | * shared_tables is a "step function" (or "staircase function") | |
67 | * and it is increased by one when the second vrf is associated to a | |
68 | * table. | |
69 | * | |
70 | * at t2, vrf0 and vrf2 are bound to table 100: shared_tables = 1. | |
71 | * | |
72 | * at t3, another dev (vrf3) is bound to the same table 100 but the | |
73 | * value of shared_tables is still 1. | |
74 | * This means that no matter how many new vrfs will register on the | |
75 | * table 100, the shared_tables will not increase (considering only | |
76 | * table 100). | |
77 | * | |
78 | * at t4, vrf4 is bound to table 101, and shared_tables = 2. | |
79 | * | |
80 | * Looking at the value of shared_tables we can immediately know if | |
81 | * the strict_mode can or cannot be enforced. Indeed, strict_mode | |
82 | * can be enforced iff shared_tables = 0. | |
83 | * | |
84 | * Conversely, shared_tables is decreased when a vrf is de-associated | |
85 | * from a table with exactly two associated vrfs. | |
86 | */ | |
87 | u32 shared_tables; | |
88 | ||
89 | bool strict_mode; | |
90 | }; | |
91 | ||
92 | struct vrf_map_elem { | |
93 | struct hlist_node hnode; | |
94 | struct list_head vrf_list; /* VRFs registered to this table */ | |
95 | ||
96 | u32 table_id; | |
97 | int users; | |
98 | int ifindex; | |
99 | }; | |
100 | ||
097d3c95 | 101 | static unsigned int vrf_net_id; |
1aa6c4f6 | 102 | |
c8baec38 AM |
103 | /* per netns vrf data */ |
104 | struct netns_vrf { | |
105 | /* protected by rtnl lock */ | |
106 | bool add_fib_rules; | |
107 | ||
108 | struct vrf_map vmap; | |
33306f1a | 109 | struct ctl_table_header *ctl_hdr; |
c8baec38 AM |
110 | }; |
111 | ||
ec539514 | 112 | struct net_vrf { |
b0e95ccd DA |
113 | struct rtable __rcu *rth; |
114 | struct rt6_info __rcu *rt6; | |
43b059a3 DA |
115 | #if IS_ENABLED(CONFIG_IPV6) |
116 | struct fib6_table *fib6_table; | |
117 | #endif | |
ec539514 | 118 | u32 tb_id; |
c8baec38 AM |
119 | |
120 | struct list_head me_list; /* entry in vrf_map_elem */ | |
121 | int ifindex; | |
ec539514 DA |
122 | }; |
123 | ||
afe80a49 DA |
124 | static void vrf_rx_stats(struct net_device *dev, int len) |
125 | { | |
126 | struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats); | |
127 | ||
128 | u64_stats_update_begin(&dstats->syncp); | |
79e0c5be | 129 | dstats->rx_packets++; |
afe80a49 DA |
130 | dstats->rx_bytes += len; |
131 | u64_stats_update_end(&dstats->syncp); | |
132 | } | |
133 | ||
57b8efa1 NA |
134 | static void vrf_tx_error(struct net_device *vrf_dev, struct sk_buff *skb) |
135 | { | |
136 | vrf_dev->stats.tx_errors++; | |
137 | kfree_skb(skb); | |
138 | } | |
139 | ||
bc1f4470 | 140 | static void vrf_get_stats64(struct net_device *dev, |
141 | struct rtnl_link_stats64 *stats) | |
193125db DA |
142 | { |
143 | int i; | |
144 | ||
145 | for_each_possible_cpu(i) { | |
146 | const struct pcpu_dstats *dstats; | |
147 | u64 tbytes, tpkts, tdrops, rbytes, rpkts; | |
148 | unsigned int start; | |
149 | ||
150 | dstats = per_cpu_ptr(dev->dstats, i); | |
151 | do { | |
068c38ad | 152 | start = u64_stats_fetch_begin(&dstats->syncp); |
193125db | 153 | tbytes = dstats->tx_bytes; |
79e0c5be DB |
154 | tpkts = dstats->tx_packets; |
155 | tdrops = dstats->tx_drops; | |
193125db | 156 | rbytes = dstats->rx_bytes; |
79e0c5be | 157 | rpkts = dstats->rx_packets; |
068c38ad | 158 | } while (u64_stats_fetch_retry(&dstats->syncp, start)); |
193125db DA |
159 | stats->tx_bytes += tbytes; |
160 | stats->tx_packets += tpkts; | |
161 | stats->tx_dropped += tdrops; | |
162 | stats->rx_bytes += rbytes; | |
163 | stats->rx_packets += rpkts; | |
164 | } | |
193125db DA |
165 | } |
166 | ||
c8baec38 AM |
167 | static struct vrf_map *netns_vrf_map(struct net *net) |
168 | { | |
169 | struct netns_vrf *nn_vrf = net_generic(net, vrf_net_id); | |
170 | ||
171 | return &nn_vrf->vmap; | |
172 | } | |
173 | ||
174 | static struct vrf_map *netns_vrf_map_by_dev(struct net_device *dev) | |
175 | { | |
176 | return netns_vrf_map(dev_net(dev)); | |
177 | } | |
178 | ||
a59a8ffd AM |
179 | static int vrf_map_elem_get_vrf_ifindex(struct vrf_map_elem *me) |
180 | { | |
181 | struct list_head *me_head = &me->vrf_list; | |
182 | struct net_vrf *vrf; | |
183 | ||
184 | if (list_empty(me_head)) | |
185 | return -ENODEV; | |
186 | ||
187 | vrf = list_first_entry(me_head, struct net_vrf, me_list); | |
188 | ||
189 | return vrf->ifindex; | |
190 | } | |
191 | ||
c8baec38 AM |
192 | static struct vrf_map_elem *vrf_map_elem_alloc(gfp_t flags) |
193 | { | |
194 | struct vrf_map_elem *me; | |
195 | ||
196 | me = kmalloc(sizeof(*me), flags); | |
197 | if (!me) | |
198 | return NULL; | |
199 | ||
200 | return me; | |
201 | } | |
202 | ||
203 | static void vrf_map_elem_free(struct vrf_map_elem *me) | |
204 | { | |
205 | kfree(me); | |
206 | } | |
207 | ||
208 | static void vrf_map_elem_init(struct vrf_map_elem *me, int table_id, | |
209 | int ifindex, int users) | |
210 | { | |
211 | me->table_id = table_id; | |
212 | me->ifindex = ifindex; | |
213 | me->users = users; | |
214 | INIT_LIST_HEAD(&me->vrf_list); | |
215 | } | |
216 | ||
217 | static struct vrf_map_elem *vrf_map_lookup_elem(struct vrf_map *vmap, | |
218 | u32 table_id) | |
219 | { | |
220 | struct vrf_map_elem *me; | |
221 | u32 key; | |
222 | ||
223 | key = jhash_1word(table_id, HASH_INITVAL); | |
224 | hash_for_each_possible(vmap->ht, me, hnode, key) { | |
225 | if (me->table_id == table_id) | |
226 | return me; | |
227 | } | |
228 | ||
229 | return NULL; | |
230 | } | |
231 | ||
232 | static void vrf_map_add_elem(struct vrf_map *vmap, struct vrf_map_elem *me) | |
233 | { | |
234 | u32 table_id = me->table_id; | |
235 | u32 key; | |
236 | ||
237 | key = jhash_1word(table_id, HASH_INITVAL); | |
238 | hash_add(vmap->ht, &me->hnode, key); | |
239 | } | |
240 | ||
241 | static void vrf_map_del_elem(struct vrf_map_elem *me) | |
242 | { | |
243 | hash_del(&me->hnode); | |
244 | } | |
245 | ||
246 | static void vrf_map_lock(struct vrf_map *vmap) __acquires(&vmap->vmap_lock) | |
247 | { | |
248 | spin_lock(&vmap->vmap_lock); | |
249 | } | |
250 | ||
251 | static void vrf_map_unlock(struct vrf_map *vmap) __releases(&vmap->vmap_lock) | |
252 | { | |
253 | spin_unlock(&vmap->vmap_lock); | |
254 | } | |
255 | ||
256 | /* called with rtnl lock held */ | |
257 | static int | |
258 | vrf_map_register_dev(struct net_device *dev, struct netlink_ext_ack *extack) | |
259 | { | |
260 | struct vrf_map *vmap = netns_vrf_map_by_dev(dev); | |
261 | struct net_vrf *vrf = netdev_priv(dev); | |
262 | struct vrf_map_elem *new_me, *me; | |
263 | u32 table_id = vrf->tb_id; | |
264 | bool free_new_me = false; | |
265 | int users; | |
266 | int res; | |
267 | ||
268 | /* we pre-allocate elements used in the spin-locked section (so that we | |
e9a0bf6d | 269 | * keep the spinlock as short as possible). |
c8baec38 AM |
270 | */ |
271 | new_me = vrf_map_elem_alloc(GFP_KERNEL); | |
272 | if (!new_me) | |
273 | return -ENOMEM; | |
274 | ||
275 | vrf_map_elem_init(new_me, table_id, dev->ifindex, 0); | |
276 | ||
277 | vrf_map_lock(vmap); | |
278 | ||
279 | me = vrf_map_lookup_elem(vmap, table_id); | |
280 | if (!me) { | |
281 | me = new_me; | |
282 | vrf_map_add_elem(vmap, me); | |
283 | goto link_vrf; | |
284 | } | |
285 | ||
286 | /* we already have an entry in the vrf_map, so it means there is (at | |
287 | * least) a vrf registered on the specific table. | |
288 | */ | |
289 | free_new_me = true; | |
290 | if (vmap->strict_mode) { | |
291 | /* vrfs cannot share the same table */ | |
292 | NL_SET_ERR_MSG(extack, "Table is used by another VRF"); | |
293 | res = -EBUSY; | |
294 | goto unlock; | |
295 | } | |
296 | ||
297 | link_vrf: | |
298 | users = ++me->users; | |
299 | if (users == 2) | |
300 | ++vmap->shared_tables; | |
301 | ||
302 | list_add(&vrf->me_list, &me->vrf_list); | |
303 | ||
304 | res = 0; | |
305 | ||
306 | unlock: | |
307 | vrf_map_unlock(vmap); | |
308 | ||
309 | /* clean-up, if needed */ | |
310 | if (free_new_me) | |
311 | vrf_map_elem_free(new_me); | |
312 | ||
313 | return res; | |
314 | } | |
315 | ||
316 | /* called with rtnl lock held */ | |
317 | static void vrf_map_unregister_dev(struct net_device *dev) | |
318 | { | |
319 | struct vrf_map *vmap = netns_vrf_map_by_dev(dev); | |
320 | struct net_vrf *vrf = netdev_priv(dev); | |
321 | u32 table_id = vrf->tb_id; | |
322 | struct vrf_map_elem *me; | |
323 | int users; | |
324 | ||
325 | vrf_map_lock(vmap); | |
326 | ||
327 | me = vrf_map_lookup_elem(vmap, table_id); | |
328 | if (!me) | |
329 | goto unlock; | |
330 | ||
331 | list_del(&vrf->me_list); | |
332 | ||
333 | users = --me->users; | |
334 | if (users == 1) { | |
335 | --vmap->shared_tables; | |
336 | } else if (users == 0) { | |
337 | vrf_map_del_elem(me); | |
338 | ||
339 | /* no one will refer to this element anymore */ | |
340 | vrf_map_elem_free(me); | |
341 | } | |
342 | ||
343 | unlock: | |
344 | vrf_map_unlock(vmap); | |
345 | } | |
346 | ||
a59a8ffd AM |
347 | /* return the vrf device index associated with the table_id */ |
348 | static int vrf_ifindex_lookup_by_table_id(struct net *net, u32 table_id) | |
349 | { | |
350 | struct vrf_map *vmap = netns_vrf_map(net); | |
351 | struct vrf_map_elem *me; | |
352 | int ifindex; | |
353 | ||
354 | vrf_map_lock(vmap); | |
355 | ||
356 | if (!vmap->strict_mode) { | |
357 | ifindex = -EPERM; | |
358 | goto unlock; | |
359 | } | |
360 | ||
361 | me = vrf_map_lookup_elem(vmap, table_id); | |
362 | if (!me) { | |
363 | ifindex = -ENODEV; | |
364 | goto unlock; | |
365 | } | |
366 | ||
367 | ifindex = vrf_map_elem_get_vrf_ifindex(me); | |
368 | ||
369 | unlock: | |
370 | vrf_map_unlock(vmap); | |
371 | ||
372 | return ifindex; | |
373 | } | |
374 | ||
dcdd43c4 DA |
375 | /* by default VRF devices do not have a qdisc and are expected |
376 | * to be created with only a single queue. | |
377 | */ | |
378 | static bool qdisc_tx_is_default(const struct net_device *dev) | |
379 | { | |
380 | struct netdev_queue *txq; | |
381 | struct Qdisc *qdisc; | |
382 | ||
383 | if (dev->num_tx_queues > 1) | |
384 | return false; | |
385 | ||
386 | txq = netdev_get_tx_queue(dev, 0); | |
387 | qdisc = rcu_access_pointer(txq->qdisc); | |
388 | ||
389 | return !qdisc->enqueue; | |
390 | } | |
391 | ||
afe80a49 DA |
392 | /* Local traffic destined to local address. Reinsert the packet to rx |
393 | * path, similar to loopback handling. | |
394 | */ | |
395 | static int vrf_local_xmit(struct sk_buff *skb, struct net_device *dev, | |
396 | struct dst_entry *dst) | |
397 | { | |
398 | int len = skb->len; | |
399 | ||
400 | skb_orphan(skb); | |
401 | ||
402 | skb_dst_set(skb, dst); | |
afe80a49 DA |
403 | |
404 | /* set pkt_type to avoid skb hitting packet taps twice - | |
405 | * once on Tx and again in Rx processing | |
406 | */ | |
407 | skb->pkt_type = PACKET_LOOPBACK; | |
408 | ||
409 | skb->protocol = eth_type_trans(skb, dev); | |
410 | ||
baebdf48 | 411 | if (likely(__netif_rx(skb) == NET_RX_SUCCESS)) |
afe80a49 DA |
412 | vrf_rx_stats(dev, len); |
413 | else | |
79e0c5be | 414 | this_cpu_inc(dev->dstats->rx_drops); |
afe80a49 DA |
415 | |
416 | return NETDEV_TX_OK; | |
417 | } | |
418 | ||
8c9c296a FW |
419 | static void vrf_nf_set_untracked(struct sk_buff *skb) |
420 | { | |
421 | if (skb_get_nfct(skb) == 0) | |
422 | nf_ct_set(skb, NULL, IP_CT_UNTRACKED); | |
423 | } | |
424 | ||
425 | static void vrf_nf_reset_ct(struct sk_buff *skb) | |
426 | { | |
427 | if (skb_get_nfct(skb) == IP_CT_UNTRACKED) | |
428 | nf_reset_ct(skb); | |
429 | } | |
430 | ||
35402e31 | 431 | #if IS_ENABLED(CONFIG_IPV6) |
4c1feac5 DA |
432 | static int vrf_ip6_local_out(struct net *net, struct sock *sk, |
433 | struct sk_buff *skb) | |
434 | { | |
435 | int err; | |
436 | ||
8c9c296a FW |
437 | vrf_nf_reset_ct(skb); |
438 | ||
4c1feac5 DA |
439 | err = nf_hook(NFPROTO_IPV6, NF_INET_LOCAL_OUT, net, |
440 | sk, skb, NULL, skb_dst(skb)->dev, dst_output); | |
441 | ||
442 | if (likely(err == 1)) | |
443 | err = dst_output(net, sk, skb); | |
444 | ||
445 | return err; | |
446 | } | |
447 | ||
35402e31 DA |
448 | static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb, |
449 | struct net_device *dev) | |
450 | { | |
107e47cc | 451 | const struct ipv6hdr *iph; |
35402e31 | 452 | struct net *net = dev_net(skb->dev); |
107e47cc | 453 | struct flowi6 fl6; |
35402e31 DA |
454 | int ret = NET_XMIT_DROP; |
455 | struct dst_entry *dst; | |
456 | struct dst_entry *dst_null = &net->ipv6.ip6_null_entry->dst; | |
457 | ||
107e47cc PK |
458 | if (!pskb_may_pull(skb, ETH_HLEN + sizeof(struct ipv6hdr))) |
459 | goto err; | |
460 | ||
461 | iph = ipv6_hdr(skb); | |
462 | ||
463 | memset(&fl6, 0, sizeof(fl6)); | |
464 | /* needed to match OIF rule */ | |
40867d74 | 465 | fl6.flowi6_l3mdev = dev->ifindex; |
107e47cc PK |
466 | fl6.flowi6_iif = LOOPBACK_IFINDEX; |
467 | fl6.daddr = iph->daddr; | |
468 | fl6.saddr = iph->saddr; | |
469 | fl6.flowlabel = ip6_flowinfo(iph); | |
470 | fl6.flowi6_mark = skb->mark; | |
471 | fl6.flowi6_proto = iph->nexthdr; | |
107e47cc | 472 | |
a53c1028 DA |
473 | dst = ip6_dst_lookup_flow(net, NULL, &fl6, NULL); |
474 | if (IS_ERR(dst) || dst == dst_null) | |
35402e31 DA |
475 | goto err; |
476 | ||
477 | skb_dst_drop(skb); | |
b4869aa2 | 478 | |
2e1534f3 ND |
479 | /* if dst.dev is the VRF device again this is locally originated traffic |
480 | * destined to a local address. Short circuit to Rx path. | |
b4869aa2 | 481 | */ |
4f04256c DA |
482 | if (dst->dev == dev) |
483 | return vrf_local_xmit(skb, dev, dst); | |
b4869aa2 | 484 | |
35402e31 DA |
485 | skb_dst_set(skb, dst); |
486 | ||
911a66fb DA |
487 | /* strip the ethernet header added for pass through VRF device */ |
488 | __skb_pull(skb, skb_network_offset(skb)); | |
489 | ||
ee201011 | 490 | memset(IP6CB(skb), 0, sizeof(*IP6CB(skb))); |
4c1feac5 | 491 | ret = vrf_ip6_local_out(net, skb->sk, skb); |
35402e31 DA |
492 | if (unlikely(net_xmit_eval(ret))) |
493 | dev->stats.tx_errors++; | |
494 | else | |
495 | ret = NET_XMIT_SUCCESS; | |
496 | ||
497 | return ret; | |
498 | err: | |
499 | vrf_tx_error(dev, skb); | |
500 | return NET_XMIT_DROP; | |
501 | } | |
502 | #else | |
193125db DA |
503 | static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb, |
504 | struct net_device *dev) | |
505 | { | |
57b8efa1 NA |
506 | vrf_tx_error(dev, skb); |
507 | return NET_XMIT_DROP; | |
193125db | 508 | } |
35402e31 | 509 | #endif |
193125db | 510 | |
ebfc102c DA |
511 | /* based on ip_local_out; can't use it b/c the dst is switched pointing to us */ |
512 | static int vrf_ip_local_out(struct net *net, struct sock *sk, | |
513 | struct sk_buff *skb) | |
514 | { | |
515 | int err; | |
516 | ||
8c9c296a FW |
517 | vrf_nf_reset_ct(skb); |
518 | ||
ebfc102c DA |
519 | err = nf_hook(NFPROTO_IPV4, NF_INET_LOCAL_OUT, net, sk, |
520 | skb, NULL, skb_dst(skb)->dev, dst_output); | |
521 | if (likely(err == 1)) | |
522 | err = dst_output(net, sk, skb); | |
523 | ||
524 | return err; | |
525 | } | |
526 | ||
193125db DA |
527 | static netdev_tx_t vrf_process_v4_outbound(struct sk_buff *skb, |
528 | struct net_device *vrf_dev) | |
529 | { | |
107e47cc | 530 | struct iphdr *ip4h; |
193125db | 531 | int ret = NET_XMIT_DROP; |
107e47cc | 532 | struct flowi4 fl4; |
911a66fb DA |
533 | struct net *net = dev_net(vrf_dev); |
534 | struct rtable *rt; | |
535 | ||
107e47cc PK |
536 | if (!pskb_may_pull(skb, ETH_HLEN + sizeof(struct iphdr))) |
537 | goto err; | |
538 | ||
539 | ip4h = ip_hdr(skb); | |
540 | ||
541 | memset(&fl4, 0, sizeof(fl4)); | |
542 | /* needed to match OIF rule */ | |
40867d74 | 543 | fl4.flowi4_l3mdev = vrf_dev->ifindex; |
107e47cc PK |
544 | fl4.flowi4_iif = LOOPBACK_IFINDEX; |
545 | fl4.flowi4_tos = RT_TOS(ip4h->tos); | |
40867d74 | 546 | fl4.flowi4_flags = FLOWI_FLAG_ANYSRC; |
107e47cc PK |
547 | fl4.flowi4_proto = ip4h->protocol; |
548 | fl4.daddr = ip4h->daddr; | |
549 | fl4.saddr = ip4h->saddr; | |
550 | ||
911a66fb DA |
551 | rt = ip_route_output_flow(net, &fl4, NULL); |
552 | if (IS_ERR(rt)) | |
553 | goto err; | |
193125db | 554 | |
911a66fb | 555 | skb_dst_drop(skb); |
afe80a49 | 556 | |
2e1534f3 ND |
557 | /* if dst.dev is the VRF device again this is locally originated traffic |
558 | * destined to a local address. Short circuit to Rx path. | |
afe80a49 | 559 | */ |
4f04256c DA |
560 | if (rt->dst.dev == vrf_dev) |
561 | return vrf_local_xmit(skb, vrf_dev, &rt->dst); | |
afe80a49 | 562 | |
911a66fb DA |
563 | skb_dst_set(skb, &rt->dst); |
564 | ||
565 | /* strip the ethernet header added for pass through VRF device */ | |
566 | __skb_pull(skb, skb_network_offset(skb)); | |
193125db DA |
567 | |
568 | if (!ip4h->saddr) { | |
569 | ip4h->saddr = inet_select_addr(skb_dst(skb)->dev, 0, | |
570 | RT_SCOPE_LINK); | |
571 | } | |
572 | ||
ee201011 | 573 | memset(IPCB(skb), 0, sizeof(*IPCB(skb))); |
ebfc102c | 574 | ret = vrf_ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb); |
193125db DA |
575 | if (unlikely(net_xmit_eval(ret))) |
576 | vrf_dev->stats.tx_errors++; | |
577 | else | |
578 | ret = NET_XMIT_SUCCESS; | |
579 | ||
580 | out: | |
581 | return ret; | |
582 | err: | |
57b8efa1 | 583 | vrf_tx_error(vrf_dev, skb); |
193125db DA |
584 | goto out; |
585 | } | |
586 | ||
587 | static netdev_tx_t is_ip_tx_frame(struct sk_buff *skb, struct net_device *dev) | |
588 | { | |
589 | switch (skb->protocol) { | |
590 | case htons(ETH_P_IP): | |
591 | return vrf_process_v4_outbound(skb, dev); | |
592 | case htons(ETH_P_IPV6): | |
593 | return vrf_process_v6_outbound(skb, dev); | |
594 | default: | |
57b8efa1 | 595 | vrf_tx_error(dev, skb); |
193125db DA |
596 | return NET_XMIT_DROP; |
597 | } | |
598 | } | |
599 | ||
600 | static netdev_tx_t vrf_xmit(struct sk_buff *skb, struct net_device *dev) | |
601 | { | |
f7887d40 | 602 | int len = skb->len; |
193125db DA |
603 | netdev_tx_t ret = is_ip_tx_frame(skb, dev); |
604 | ||
605 | if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { | |
606 | struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats); | |
607 | ||
608 | u64_stats_update_begin(&dstats->syncp); | |
79e0c5be | 609 | dstats->tx_packets++; |
f7887d40 | 610 | dstats->tx_bytes += len; |
193125db DA |
611 | u64_stats_update_end(&dstats->syncp); |
612 | } else { | |
79e0c5be | 613 | this_cpu_inc(dev->dstats->tx_drops); |
193125db DA |
614 | } |
615 | ||
616 | return ret; | |
617 | } | |
618 | ||
9e2b7fa2 | 619 | static void vrf_finish_direct(struct sk_buff *skb) |
dcdd43c4 DA |
620 | { |
621 | struct net_device *vrf_dev = skb->dev; | |
622 | ||
623 | if (!list_empty(&vrf_dev->ptype_all) && | |
624 | likely(skb_headroom(skb) >= ETH_HLEN)) { | |
d58ff351 | 625 | struct ethhdr *eth = skb_push(skb, ETH_HLEN); |
dcdd43c4 DA |
626 | |
627 | ether_addr_copy(eth->h_source, vrf_dev->dev_addr); | |
628 | eth_zero_addr(eth->h_dest); | |
629 | eth->h_proto = skb->protocol; | |
630 | ||
dcdd43c4 | 631 | dev_queue_xmit_nit(skb, vrf_dev); |
dcdd43c4 DA |
632 | |
633 | skb_pull(skb, ETH_HLEN); | |
634 | } | |
635 | ||
8c9c296a | 636 | vrf_nf_reset_ct(skb); |
dcdd43c4 DA |
637 | } |
638 | ||
35402e31 | 639 | #if IS_ENABLED(CONFIG_IPV6) |
35402e31 DA |
640 | /* modelled after ip6_finish_output2 */ |
641 | static int vrf_finish_output6(struct net *net, struct sock *sk, | |
642 | struct sk_buff *skb) | |
643 | { | |
644 | struct dst_entry *dst = skb_dst(skb); | |
645 | struct net_device *dev = dst->dev; | |
9b1c1ef1 | 646 | const struct in6_addr *nexthop; |
35402e31 | 647 | struct neighbour *neigh; |
35402e31 DA |
648 | int ret; |
649 | ||
8c9c296a | 650 | vrf_nf_reset_ct(skb); |
eb63ecc1 | 651 | |
35402e31 DA |
652 | skb->protocol = htons(ETH_P_IPV6); |
653 | skb->dev = dev; | |
654 | ||
2033ab90 | 655 | rcu_read_lock(); |
35402e31 DA |
656 | nexthop = rt6_nexthop((struct rt6_info *)dst, &ipv6_hdr(skb)->daddr); |
657 | neigh = __ipv6_neigh_lookup_noref(dst->dev, nexthop); | |
658 | if (unlikely(!neigh)) | |
659 | neigh = __neigh_create(&nd_tbl, nexthop, dst->dev, false); | |
660 | if (!IS_ERR(neigh)) { | |
4ff06203 | 661 | sock_confirm_neigh(skb, neigh); |
0353f282 | 662 | ret = neigh_output(neigh, skb, false); |
2033ab90 | 663 | rcu_read_unlock(); |
35402e31 DA |
664 | return ret; |
665 | } | |
2033ab90 | 666 | rcu_read_unlock(); |
35402e31 DA |
667 | |
668 | IP6_INC_STATS(dev_net(dst->dev), | |
669 | ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES); | |
670 | kfree_skb(skb); | |
671 | return -EINVAL; | |
672 | } | |
673 | ||
674 | /* modelled after ip6_output */ | |
675 | static int vrf_output6(struct net *net, struct sock *sk, struct sk_buff *skb) | |
676 | { | |
677 | return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING, | |
678 | net, sk, skb, NULL, skb_dst(skb)->dev, | |
679 | vrf_finish_output6, | |
680 | !(IP6CB(skb)->flags & IP6SKB_REROUTED)); | |
681 | } | |
682 | ||
4c1feac5 DA |
683 | /* set dst on skb to send packet to us via dev_xmit path. Allows |
684 | * packet to go through device based features such as qdisc, netfilter | |
685 | * hooks and packet sockets with skb->dev set to vrf device. | |
686 | */ | |
a9ec54d1 DA |
687 | static struct sk_buff *vrf_ip6_out_redirect(struct net_device *vrf_dev, |
688 | struct sk_buff *skb) | |
4c1feac5 DA |
689 | { |
690 | struct net_vrf *vrf = netdev_priv(vrf_dev); | |
691 | struct dst_entry *dst = NULL; | |
692 | struct rt6_info *rt6; | |
693 | ||
4c1feac5 DA |
694 | rcu_read_lock(); |
695 | ||
696 | rt6 = rcu_dereference(vrf->rt6); | |
697 | if (likely(rt6)) { | |
698 | dst = &rt6->dst; | |
699 | dst_hold(dst); | |
700 | } | |
701 | ||
702 | rcu_read_unlock(); | |
703 | ||
704 | if (unlikely(!dst)) { | |
705 | vrf_tx_error(vrf_dev, skb); | |
706 | return NULL; | |
707 | } | |
708 | ||
709 | skb_dst_drop(skb); | |
710 | skb_dst_set(skb, dst); | |
711 | ||
712 | return skb; | |
713 | } | |
714 | ||
9e2b7fa2 MW |
715 | static int vrf_output6_direct_finish(struct net *net, struct sock *sk, |
716 | struct sk_buff *skb) | |
717 | { | |
718 | vrf_finish_direct(skb); | |
719 | ||
720 | return vrf_ip6_local_out(net, sk, skb); | |
721 | } | |
722 | ||
a9ec54d1 DA |
723 | static int vrf_output6_direct(struct net *net, struct sock *sk, |
724 | struct sk_buff *skb) | |
725 | { | |
9e2b7fa2 MW |
726 | int err = 1; |
727 | ||
a9ec54d1 DA |
728 | skb->protocol = htons(ETH_P_IPV6); |
729 | ||
9e2b7fa2 MW |
730 | if (!(IPCB(skb)->flags & IPSKB_REROUTED)) |
731 | err = nf_hook(NFPROTO_IPV6, NF_INET_POST_ROUTING, net, sk, skb, | |
732 | NULL, skb->dev, vrf_output6_direct_finish); | |
733 | ||
734 | if (likely(err == 1)) | |
735 | vrf_finish_direct(skb); | |
736 | ||
737 | return err; | |
738 | } | |
739 | ||
740 | static int vrf_ip6_out_direct_finish(struct net *net, struct sock *sk, | |
741 | struct sk_buff *skb) | |
742 | { | |
743 | int err; | |
744 | ||
745 | err = vrf_output6_direct(net, sk, skb); | |
746 | if (likely(err == 1)) | |
747 | err = vrf_ip6_local_out(net, sk, skb); | |
748 | ||
749 | return err; | |
a9ec54d1 DA |
750 | } |
751 | ||
752 | static struct sk_buff *vrf_ip6_out_direct(struct net_device *vrf_dev, | |
753 | struct sock *sk, | |
754 | struct sk_buff *skb) | |
755 | { | |
756 | struct net *net = dev_net(vrf_dev); | |
757 | int err; | |
758 | ||
759 | skb->dev = vrf_dev; | |
760 | ||
761 | err = nf_hook(NFPROTO_IPV6, NF_INET_LOCAL_OUT, net, sk, | |
9e2b7fa2 | 762 | skb, NULL, vrf_dev, vrf_ip6_out_direct_finish); |
a9ec54d1 DA |
763 | |
764 | if (likely(err == 1)) | |
765 | err = vrf_output6_direct(net, sk, skb); | |
766 | ||
a9ec54d1 | 767 | if (likely(err == 1)) |
9e2b7fa2 | 768 | return skb; |
a9ec54d1 | 769 | |
9e2b7fa2 | 770 | return NULL; |
a9ec54d1 DA |
771 | } |
772 | ||
773 | static struct sk_buff *vrf_ip6_out(struct net_device *vrf_dev, | |
774 | struct sock *sk, | |
775 | struct sk_buff *skb) | |
776 | { | |
777 | /* don't divert link scope packets */ | |
778 | if (rt6_need_strict(&ipv6_hdr(skb)->daddr)) | |
779 | return skb; | |
780 | ||
d43b75fb ND |
781 | vrf_nf_set_untracked(skb); |
782 | ||
16b9db1c DA |
783 | if (qdisc_tx_is_default(vrf_dev) || |
784 | IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED) | |
a9ec54d1 DA |
785 | return vrf_ip6_out_direct(vrf_dev, sk, skb); |
786 | ||
787 | return vrf_ip6_out_redirect(vrf_dev, skb); | |
788 | } | |
789 | ||
b0e95ccd | 790 | /* holding rtnl */ |
810e530b | 791 | static void vrf_rt6_release(struct net_device *dev, struct net_vrf *vrf) |
35402e31 | 792 | { |
b0e95ccd | 793 | struct rt6_info *rt6 = rtnl_dereference(vrf->rt6); |
810e530b DA |
794 | struct net *net = dev_net(dev); |
795 | struct dst_entry *dst; | |
b0e95ccd | 796 | |
b4869aa2 | 797 | RCU_INIT_POINTER(vrf->rt6, NULL); |
b4869aa2 | 798 | synchronize_rcu(); |
b0e95ccd | 799 | |
810e530b DA |
800 | /* move dev in dst's to loopback so this VRF device can be deleted |
801 | * - based on dst_ifdown | |
802 | */ | |
803 | if (rt6) { | |
804 | dst = &rt6->dst; | |
d62607c3 JK |
805 | netdev_ref_replace(dst->dev, net->loopback_dev, |
806 | &dst->dev_tracker, GFP_KERNEL); | |
810e530b | 807 | dst->dev = net->loopback_dev; |
810e530b DA |
808 | dst_release(dst); |
809 | } | |
35402e31 DA |
810 | } |
811 | ||
812 | static int vrf_rt6_create(struct net_device *dev) | |
813 | { | |
af13b3c3 | 814 | int flags = DST_NOPOLICY | DST_NOXFRM; |
35402e31 | 815 | struct net_vrf *vrf = netdev_priv(dev); |
9ab179d8 | 816 | struct net *net = dev_net(dev); |
4f04256c | 817 | struct rt6_info *rt6; |
35402e31 DA |
818 | int rc = -ENOMEM; |
819 | ||
e4348637 DA |
820 | /* IPv6 can be CONFIG enabled and then disabled runtime */ |
821 | if (!ipv6_mod_enabled()) | |
822 | return 0; | |
823 | ||
43b059a3 DA |
824 | vrf->fib6_table = fib6_new_table(net, vrf->tb_id); |
825 | if (!vrf->fib6_table) | |
b3b4663c DA |
826 | goto out; |
827 | ||
b4869aa2 DA |
828 | /* create a dst for routing packets out a VRF device */ |
829 | rt6 = ip6_dst_alloc(net, dev, flags); | |
35402e31 DA |
830 | if (!rt6) |
831 | goto out; | |
832 | ||
b3b4663c | 833 | rt6->dst.output = vrf_output6; |
b4869aa2 | 834 | |
b0e95ccd DA |
835 | rcu_assign_pointer(vrf->rt6, rt6); |
836 | ||
35402e31 DA |
837 | rc = 0; |
838 | out: | |
839 | return rc; | |
840 | } | |
841 | #else | |
4c1feac5 DA |
842 | static struct sk_buff *vrf_ip6_out(struct net_device *vrf_dev, |
843 | struct sock *sk, | |
844 | struct sk_buff *skb) | |
845 | { | |
846 | return skb; | |
847 | } | |
848 | ||
810e530b | 849 | static void vrf_rt6_release(struct net_device *dev, struct net_vrf *vrf) |
35402e31 DA |
850 | { |
851 | } | |
852 | ||
853 | static int vrf_rt6_create(struct net_device *dev) | |
854 | { | |
855 | return 0; | |
856 | } | |
857 | #endif | |
858 | ||
8f58336d | 859 | /* modelled after ip_finish_output2 */ |
0c4b51f0 | 860 | static int vrf_finish_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
193125db | 861 | { |
8f58336d DA |
862 | struct dst_entry *dst = skb_dst(skb); |
863 | struct rtable *rt = (struct rtable *)dst; | |
864 | struct net_device *dev = dst->dev; | |
865 | unsigned int hh_len = LL_RESERVED_SPACE(dev); | |
866 | struct neighbour *neigh; | |
5c9f7c1d | 867 | bool is_v6gw = false; |
8f58336d | 868 | |
8c9c296a | 869 | vrf_nf_reset_ct(skb); |
eb63ecc1 | 870 | |
8f58336d DA |
871 | /* Be paranoid, rather than too clever. */ |
872 | if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) { | |
14ee70ca VA |
873 | skb = skb_expand_head(skb, hh_len); |
874 | if (!skb) { | |
06669e68 | 875 | dev->stats.tx_errors++; |
14ee70ca | 876 | return -ENOMEM; |
8f58336d | 877 | } |
8f58336d DA |
878 | } |
879 | ||
2033ab90 | 880 | rcu_read_lock(); |
8f58336d | 881 | |
5c9f7c1d | 882 | neigh = ip_neigh_for_gw(rt, skb, &is_v6gw); |
4ff06203 | 883 | if (!IS_ERR(neigh)) { |
14ee70ca VA |
884 | int ret; |
885 | ||
4ff06203 | 886 | sock_confirm_neigh(skb, neigh); |
5c9f7c1d DA |
887 | /* if crossing protocols, can not use the cached header */ |
888 | ret = neigh_output(neigh, skb, is_v6gw); | |
2033ab90 | 889 | rcu_read_unlock(); |
82dd0d2a | 890 | return ret; |
4ff06203 | 891 | } |
8f58336d | 892 | |
2033ab90 | 893 | rcu_read_unlock(); |
82dd0d2a | 894 | vrf_tx_error(skb->dev, skb); |
14ee70ca | 895 | return -EINVAL; |
193125db DA |
896 | } |
897 | ||
ede2059d | 898 | static int vrf_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
193125db DA |
899 | { |
900 | struct net_device *dev = skb_dst(skb)->dev; | |
901 | ||
29a26a56 | 902 | IP_UPD_PO_STATS(net, IPSTATS_MIB_OUT, skb->len); |
193125db DA |
903 | |
904 | skb->dev = dev; | |
905 | skb->protocol = htons(ETH_P_IP); | |
906 | ||
29a26a56 EB |
907 | return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING, |
908 | net, sk, skb, NULL, dev, | |
8f58336d | 909 | vrf_finish_output, |
193125db DA |
910 | !(IPCB(skb)->flags & IPSKB_REROUTED)); |
911 | } | |
912 | ||
ebfc102c DA |
913 | /* set dst on skb to send packet to us via dev_xmit path. Allows |
914 | * packet to go through device based features such as qdisc, netfilter | |
915 | * hooks and packet sockets with skb->dev set to vrf device. | |
916 | */ | |
dcdd43c4 DA |
917 | static struct sk_buff *vrf_ip_out_redirect(struct net_device *vrf_dev, |
918 | struct sk_buff *skb) | |
ebfc102c DA |
919 | { |
920 | struct net_vrf *vrf = netdev_priv(vrf_dev); | |
921 | struct dst_entry *dst = NULL; | |
922 | struct rtable *rth; | |
923 | ||
924 | rcu_read_lock(); | |
925 | ||
926 | rth = rcu_dereference(vrf->rth); | |
927 | if (likely(rth)) { | |
928 | dst = &rth->dst; | |
929 | dst_hold(dst); | |
930 | } | |
931 | ||
932 | rcu_read_unlock(); | |
933 | ||
934 | if (unlikely(!dst)) { | |
935 | vrf_tx_error(vrf_dev, skb); | |
936 | return NULL; | |
937 | } | |
938 | ||
939 | skb_dst_drop(skb); | |
940 | skb_dst_set(skb, dst); | |
941 | ||
942 | return skb; | |
943 | } | |
944 | ||
9e2b7fa2 MW |
945 | static int vrf_output_direct_finish(struct net *net, struct sock *sk, |
946 | struct sk_buff *skb) | |
947 | { | |
948 | vrf_finish_direct(skb); | |
949 | ||
950 | return vrf_ip_local_out(net, sk, skb); | |
951 | } | |
952 | ||
dcdd43c4 DA |
953 | static int vrf_output_direct(struct net *net, struct sock *sk, |
954 | struct sk_buff *skb) | |
955 | { | |
9e2b7fa2 MW |
956 | int err = 1; |
957 | ||
dcdd43c4 DA |
958 | skb->protocol = htons(ETH_P_IP); |
959 | ||
9e2b7fa2 MW |
960 | if (!(IPCB(skb)->flags & IPSKB_REROUTED)) |
961 | err = nf_hook(NFPROTO_IPV4, NF_INET_POST_ROUTING, net, sk, skb, | |
962 | NULL, skb->dev, vrf_output_direct_finish); | |
963 | ||
964 | if (likely(err == 1)) | |
965 | vrf_finish_direct(skb); | |
966 | ||
967 | return err; | |
968 | } | |
969 | ||
970 | static int vrf_ip_out_direct_finish(struct net *net, struct sock *sk, | |
971 | struct sk_buff *skb) | |
972 | { | |
973 | int err; | |
974 | ||
975 | err = vrf_output_direct(net, sk, skb); | |
976 | if (likely(err == 1)) | |
977 | err = vrf_ip_local_out(net, sk, skb); | |
978 | ||
979 | return err; | |
dcdd43c4 DA |
980 | } |
981 | ||
982 | static struct sk_buff *vrf_ip_out_direct(struct net_device *vrf_dev, | |
983 | struct sock *sk, | |
984 | struct sk_buff *skb) | |
985 | { | |
986 | struct net *net = dev_net(vrf_dev); | |
987 | int err; | |
988 | ||
989 | skb->dev = vrf_dev; | |
990 | ||
991 | err = nf_hook(NFPROTO_IPV4, NF_INET_LOCAL_OUT, net, sk, | |
9e2b7fa2 | 992 | skb, NULL, vrf_dev, vrf_ip_out_direct_finish); |
dcdd43c4 DA |
993 | |
994 | if (likely(err == 1)) | |
995 | err = vrf_output_direct(net, sk, skb); | |
996 | ||
dcdd43c4 | 997 | if (likely(err == 1)) |
9e2b7fa2 | 998 | return skb; |
dcdd43c4 | 999 | |
9e2b7fa2 | 1000 | return NULL; |
dcdd43c4 DA |
1001 | } |
1002 | ||
1003 | static struct sk_buff *vrf_ip_out(struct net_device *vrf_dev, | |
1004 | struct sock *sk, | |
1005 | struct sk_buff *skb) | |
1006 | { | |
1e19c4d6 DA |
1007 | /* don't divert multicast or local broadcast */ |
1008 | if (ipv4_is_multicast(ip_hdr(skb)->daddr) || | |
1009 | ipv4_is_lbcast(ip_hdr(skb)->daddr)) | |
dcdd43c4 DA |
1010 | return skb; |
1011 | ||
d43b75fb ND |
1012 | vrf_nf_set_untracked(skb); |
1013 | ||
16b9db1c DA |
1014 | if (qdisc_tx_is_default(vrf_dev) || |
1015 | IPCB(skb)->flags & IPSKB_XFRM_TRANSFORMED) | |
dcdd43c4 DA |
1016 | return vrf_ip_out_direct(vrf_dev, sk, skb); |
1017 | ||
1018 | return vrf_ip_out_redirect(vrf_dev, skb); | |
1019 | } | |
1020 | ||
ebfc102c DA |
1021 | /* called with rcu lock held */ |
1022 | static struct sk_buff *vrf_l3_out(struct net_device *vrf_dev, | |
1023 | struct sock *sk, | |
1024 | struct sk_buff *skb, | |
1025 | u16 proto) | |
1026 | { | |
1027 | switch (proto) { | |
1028 | case AF_INET: | |
1029 | return vrf_ip_out(vrf_dev, sk, skb); | |
4c1feac5 DA |
1030 | case AF_INET6: |
1031 | return vrf_ip6_out(vrf_dev, sk, skb); | |
ebfc102c DA |
1032 | } |
1033 | ||
1034 | return skb; | |
1035 | } | |
1036 | ||
b0e95ccd | 1037 | /* holding rtnl */ |
810e530b | 1038 | static void vrf_rtable_release(struct net_device *dev, struct net_vrf *vrf) |
193125db | 1039 | { |
b0e95ccd | 1040 | struct rtable *rth = rtnl_dereference(vrf->rth); |
810e530b DA |
1041 | struct net *net = dev_net(dev); |
1042 | struct dst_entry *dst; | |
b0e95ccd | 1043 | |
afe80a49 | 1044 | RCU_INIT_POINTER(vrf->rth, NULL); |
afe80a49 | 1045 | synchronize_rcu(); |
193125db | 1046 | |
810e530b DA |
1047 | /* move dev in dst's to loopback so this VRF device can be deleted |
1048 | * - based on dst_ifdown | |
1049 | */ | |
1050 | if (rth) { | |
1051 | dst = &rth->dst; | |
d62607c3 JK |
1052 | netdev_ref_replace(dst->dev, net->loopback_dev, |
1053 | &dst->dev_tracker, GFP_KERNEL); | |
810e530b | 1054 | dst->dev = net->loopback_dev; |
810e530b DA |
1055 | dst_release(dst); |
1056 | } | |
193125db DA |
1057 | } |
1058 | ||
b0e95ccd | 1059 | static int vrf_rtable_create(struct net_device *dev) |
193125db | 1060 | { |
b7503e0c | 1061 | struct net_vrf *vrf = netdev_priv(dev); |
4f04256c | 1062 | struct rtable *rth; |
193125db | 1063 | |
b3b4663c | 1064 | if (!fib_new_table(dev_net(dev), vrf->tb_id)) |
b0e95ccd | 1065 | return -ENOMEM; |
b3b4663c | 1066 | |
afe80a49 | 1067 | /* create a dst for routing packets out through a VRF device */ |
b5c8b3fe | 1068 | rth = rt_dst_alloc(dev, 0, RTN_UNICAST, 1); |
b0e95ccd DA |
1069 | if (!rth) |
1070 | return -ENOMEM; | |
193125db | 1071 | |
b0e95ccd | 1072 | rth->dst.output = vrf_output; |
b0e95ccd DA |
1073 | |
1074 | rcu_assign_pointer(vrf->rth, rth); | |
1075 | ||
1076 | return 0; | |
193125db DA |
1077 | } |
1078 | ||
1079 | /**************************** device handling ********************/ | |
1080 | ||
1081 | /* cycle interface to flush neighbor cache and move routes across tables */ | |
dc1aea1e PM |
1082 | static void cycle_netdev(struct net_device *dev, |
1083 | struct netlink_ext_ack *extack) | |
193125db DA |
1084 | { |
1085 | unsigned int flags = dev->flags; | |
1086 | int ret; | |
1087 | ||
1088 | if (!netif_running(dev)) | |
1089 | return; | |
1090 | ||
567c5e13 | 1091 | ret = dev_change_flags(dev, flags & ~IFF_UP, extack); |
193125db | 1092 | if (ret >= 0) |
567c5e13 | 1093 | ret = dev_change_flags(dev, flags, extack); |
193125db DA |
1094 | |
1095 | if (ret < 0) { | |
1096 | netdev_err(dev, | |
1097 | "Failed to cycle device %s; route tables might be wrong!\n", | |
1098 | dev->name); | |
1099 | } | |
1100 | } | |
1101 | ||
42ab19ee DA |
1102 | static int do_vrf_add_slave(struct net_device *dev, struct net_device *port_dev, |
1103 | struct netlink_ext_ack *extack) | |
193125db | 1104 | { |
bad53162 | 1105 | int ret; |
193125db | 1106 | |
26d31ac1 DA |
1107 | /* do not allow loopback device to be enslaved to a VRF. |
1108 | * The vrf device acts as the loopback for the vrf. | |
1109 | */ | |
de3baa3e DA |
1110 | if (port_dev == dev_net(dev)->loopback_dev) { |
1111 | NL_SET_ERR_MSG(extack, | |
1112 | "Can not enslave loopback device to a VRF"); | |
26d31ac1 | 1113 | return -EOPNOTSUPP; |
de3baa3e | 1114 | } |
26d31ac1 | 1115 | |
fdeea7be | 1116 | port_dev->priv_flags |= IFF_L3MDEV_SLAVE; |
42ab19ee | 1117 | ret = netdev_master_upper_dev_link(port_dev, dev, NULL, NULL, extack); |
193125db | 1118 | if (ret < 0) |
fdeea7be | 1119 | goto err; |
193125db | 1120 | |
dc1aea1e | 1121 | cycle_netdev(port_dev, extack); |
193125db DA |
1122 | |
1123 | return 0; | |
fdeea7be IS |
1124 | |
1125 | err: | |
1126 | port_dev->priv_flags &= ~IFF_L3MDEV_SLAVE; | |
1127 | return ret; | |
193125db DA |
1128 | } |
1129 | ||
33eaf2a6 DA |
1130 | static int vrf_add_slave(struct net_device *dev, struct net_device *port_dev, |
1131 | struct netlink_ext_ack *extack) | |
193125db | 1132 | { |
de3baa3e DA |
1133 | if (netif_is_l3_master(port_dev)) { |
1134 | NL_SET_ERR_MSG(extack, | |
1135 | "Can not enslave an L3 master device to a VRF"); | |
1136 | return -EINVAL; | |
1137 | } | |
1138 | ||
1139 | if (netif_is_l3_slave(port_dev)) | |
193125db DA |
1140 | return -EINVAL; |
1141 | ||
42ab19ee | 1142 | return do_vrf_add_slave(dev, port_dev, extack); |
193125db DA |
1143 | } |
1144 | ||
1145 | /* inverse of do_vrf_add_slave */ | |
1146 | static int do_vrf_del_slave(struct net_device *dev, struct net_device *port_dev) | |
1147 | { | |
193125db | 1148 | netdev_upper_dev_unlink(port_dev, dev); |
fee6d4c7 | 1149 | port_dev->priv_flags &= ~IFF_L3MDEV_SLAVE; |
193125db | 1150 | |
dc1aea1e | 1151 | cycle_netdev(port_dev, NULL); |
193125db | 1152 | |
193125db DA |
1153 | return 0; |
1154 | } | |
1155 | ||
1156 | static int vrf_del_slave(struct net_device *dev, struct net_device *port_dev) | |
1157 | { | |
193125db DA |
1158 | return do_vrf_del_slave(dev, port_dev); |
1159 | } | |
1160 | ||
1161 | static void vrf_dev_uninit(struct net_device *dev) | |
1162 | { | |
1163 | struct net_vrf *vrf = netdev_priv(dev); | |
193125db | 1164 | |
810e530b DA |
1165 | vrf_rtable_release(dev, vrf); |
1166 | vrf_rt6_release(dev, vrf); | |
193125db DA |
1167 | } |
1168 | ||
1169 | static int vrf_dev_init(struct net_device *dev) | |
1170 | { | |
1171 | struct net_vrf *vrf = netdev_priv(dev); | |
1172 | ||
193125db | 1173 | /* create the default dst which points back to us */ |
b0e95ccd | 1174 | if (vrf_rtable_create(dev) != 0) |
34d21de9 | 1175 | goto out_nomem; |
193125db | 1176 | |
35402e31 DA |
1177 | if (vrf_rt6_create(dev) != 0) |
1178 | goto out_rth; | |
1179 | ||
193125db DA |
1180 | dev->flags = IFF_MASTER | IFF_NOARP; |
1181 | ||
b87ab6b8 DA |
1182 | /* similarly, oper state is irrelevant; set to up to avoid confusion */ |
1183 | dev->operstate = IF_OPER_UP; | |
1a33e10e | 1184 | netdev_lockdep_set_classes(dev); |
193125db DA |
1185 | return 0; |
1186 | ||
35402e31 | 1187 | out_rth: |
810e530b | 1188 | vrf_rtable_release(dev, vrf); |
193125db DA |
1189 | out_nomem: |
1190 | return -ENOMEM; | |
1191 | } | |
1192 | ||
1193 | static const struct net_device_ops vrf_netdev_ops = { | |
1194 | .ndo_init = vrf_dev_init, | |
1195 | .ndo_uninit = vrf_dev_uninit, | |
1196 | .ndo_start_xmit = vrf_xmit, | |
6819e3f6 | 1197 | .ndo_set_mac_address = eth_mac_addr, |
193125db DA |
1198 | .ndo_get_stats64 = vrf_get_stats64, |
1199 | .ndo_add_slave = vrf_add_slave, | |
1200 | .ndo_del_slave = vrf_del_slave, | |
1201 | }; | |
1202 | ||
ee15ee5d DA |
1203 | static u32 vrf_fib_table(const struct net_device *dev) |
1204 | { | |
1205 | struct net_vrf *vrf = netdev_priv(dev); | |
1206 | ||
1207 | return vrf->tb_id; | |
1208 | } | |
1209 | ||
73e20b76 DA |
1210 | static int vrf_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb) |
1211 | { | |
1a4a5bf5 | 1212 | kfree_skb(skb); |
73e20b76 DA |
1213 | return 0; |
1214 | } | |
1215 | ||
1216 | static struct sk_buff *vrf_rcv_nfhook(u8 pf, unsigned int hook, | |
1217 | struct sk_buff *skb, | |
1218 | struct net_device *dev) | |
1219 | { | |
1220 | struct net *net = dev_net(dev); | |
1221 | ||
1a4a5bf5 | 1222 | if (nf_hook(pf, hook, net, NULL, skb, dev, NULL, vrf_rcv_finish) != 1) |
73e20b76 DA |
1223 | skb = NULL; /* kfree_skb(skb) handled by nf code */ |
1224 | ||
1225 | return skb; | |
1226 | } | |
1227 | ||
9125abe7 AM |
1228 | static int vrf_prepare_mac_header(struct sk_buff *skb, |
1229 | struct net_device *vrf_dev, u16 proto) | |
1230 | { | |
1231 | struct ethhdr *eth; | |
1232 | int err; | |
1233 | ||
1234 | /* in general, we do not know if there is enough space in the head of | |
1235 | * the packet for hosting the mac header. | |
1236 | */ | |
1237 | err = skb_cow_head(skb, LL_RESERVED_SPACE(vrf_dev)); | |
1238 | if (unlikely(err)) | |
1239 | /* no space in the skb head */ | |
1240 | return -ENOBUFS; | |
1241 | ||
1242 | __skb_push(skb, ETH_HLEN); | |
1243 | eth = (struct ethhdr *)skb->data; | |
1244 | ||
1245 | skb_reset_mac_header(skb); | |
012d69fb | 1246 | skb_reset_mac_len(skb); |
9125abe7 AM |
1247 | |
1248 | /* we set the ethernet destination and the source addresses to the | |
1249 | * address of the VRF device. | |
1250 | */ | |
1251 | ether_addr_copy(eth->h_dest, vrf_dev->dev_addr); | |
1252 | ether_addr_copy(eth->h_source, vrf_dev->dev_addr); | |
1253 | eth->h_proto = htons(proto); | |
1254 | ||
1255 | /* the destination address of the Ethernet frame corresponds to the | |
1256 | * address set on the VRF interface; therefore, the packet is intended | |
1257 | * to be processed locally. | |
1258 | */ | |
1259 | skb->protocol = eth->h_proto; | |
1260 | skb->pkt_type = PACKET_HOST; | |
1261 | ||
1262 | skb_postpush_rcsum(skb, skb->data, ETH_HLEN); | |
1263 | ||
1264 | skb_pull_inline(skb, ETH_HLEN); | |
1265 | ||
1266 | return 0; | |
1267 | } | |
1268 | ||
1269 | /* prepare and add the mac header to the packet if it was not set previously. | |
1270 | * In this way, packet sniffers such as tcpdump can parse the packet correctly. | |
1271 | * If the mac header was already set, the original mac header is left | |
1272 | * untouched and the function returns immediately. | |
1273 | */ | |
1274 | static int vrf_add_mac_header_if_unset(struct sk_buff *skb, | |
1275 | struct net_device *vrf_dev, | |
012d69fb | 1276 | u16 proto, struct net_device *orig_dev) |
9125abe7 | 1277 | { |
012d69fb | 1278 | if (skb_mac_header_was_set(skb) && dev_has_header(orig_dev)) |
9125abe7 AM |
1279 | return 0; |
1280 | ||
1281 | return vrf_prepare_mac_header(skb, vrf_dev, proto); | |
1282 | } | |
1283 | ||
74b20582 DA |
1284 | #if IS_ENABLED(CONFIG_IPV6) |
1285 | /* neighbor handling is done with actual device; do not want | |
1286 | * to flip skb->dev for those ndisc packets. This really fails | |
1287 | * for multiple next protocols (e.g., NEXTHDR_HOP). But it is | |
1288 | * a start. | |
1289 | */ | |
1290 | static bool ipv6_ndisc_frame(const struct sk_buff *skb) | |
1291 | { | |
1292 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
1293 | bool rc = false; | |
1294 | ||
1295 | if (iph->nexthdr == NEXTHDR_ICMP) { | |
1296 | const struct icmp6hdr *icmph; | |
1297 | struct icmp6hdr _icmph; | |
1298 | ||
1299 | icmph = skb_header_pointer(skb, sizeof(*iph), | |
1300 | sizeof(_icmph), &_icmph); | |
1301 | if (!icmph) | |
1302 | goto out; | |
1303 | ||
1304 | switch (icmph->icmp6_type) { | |
1305 | case NDISC_ROUTER_SOLICITATION: | |
1306 | case NDISC_ROUTER_ADVERTISEMENT: | |
1307 | case NDISC_NEIGHBOUR_SOLICITATION: | |
1308 | case NDISC_NEIGHBOUR_ADVERTISEMENT: | |
1309 | case NDISC_REDIRECT: | |
1310 | rc = true; | |
1311 | break; | |
1312 | } | |
1313 | } | |
1314 | ||
1315 | out: | |
1316 | return rc; | |
1317 | } | |
1318 | ||
9ff74384 DA |
1319 | static struct rt6_info *vrf_ip6_route_lookup(struct net *net, |
1320 | const struct net_device *dev, | |
1321 | struct flowi6 *fl6, | |
1322 | int ifindex, | |
b75cc8f9 | 1323 | const struct sk_buff *skb, |
9ff74384 DA |
1324 | int flags) |
1325 | { | |
1326 | struct net_vrf *vrf = netdev_priv(dev); | |
9ff74384 | 1327 | |
43b059a3 | 1328 | return ip6_pol_route(net, vrf->fib6_table, ifindex, fl6, skb, flags); |
9ff74384 DA |
1329 | } |
1330 | ||
1331 | static void vrf_ip6_input_dst(struct sk_buff *skb, struct net_device *vrf_dev, | |
1332 | int ifindex) | |
1333 | { | |
1334 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
1335 | struct flowi6 fl6 = { | |
ecf09117 AB |
1336 | .flowi6_iif = ifindex, |
1337 | .flowi6_mark = skb->mark, | |
1338 | .flowi6_proto = iph->nexthdr, | |
9ff74384 DA |
1339 | .daddr = iph->daddr, |
1340 | .saddr = iph->saddr, | |
1341 | .flowlabel = ip6_flowinfo(iph), | |
9ff74384 DA |
1342 | }; |
1343 | struct net *net = dev_net(vrf_dev); | |
1344 | struct rt6_info *rt6; | |
1345 | ||
b75cc8f9 | 1346 | rt6 = vrf_ip6_route_lookup(net, vrf_dev, &fl6, ifindex, skb, |
9ff74384 DA |
1347 | RT6_LOOKUP_F_HAS_SADDR | RT6_LOOKUP_F_IFACE); |
1348 | if (unlikely(!rt6)) | |
1349 | return; | |
1350 | ||
1351 | if (unlikely(&rt6->dst == &net->ipv6.ip6_null_entry->dst)) | |
1352 | return; | |
1353 | ||
1354 | skb_dst_set(skb, &rt6->dst); | |
1355 | } | |
1356 | ||
74b20582 DA |
1357 | static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev, |
1358 | struct sk_buff *skb) | |
1359 | { | |
9ff74384 | 1360 | int orig_iif = skb->skb_iif; |
6f12fa77 MM |
1361 | bool need_strict = rt6_need_strict(&ipv6_hdr(skb)->daddr); |
1362 | bool is_ndisc = ipv6_ndisc_frame(skb); | |
9ff74384 | 1363 | |
6f12fa77 | 1364 | /* loopback, multicast & non-ND link-local traffic; do not push through |
205704c6 | 1365 | * packet taps again. Reset pkt_type for upper layers to process skb. |
f2575c8f AT |
1366 | * For non-loopback strict packets, determine the dst using the original |
1367 | * ifindex. | |
b4869aa2 | 1368 | */ |
603113c5 | 1369 | if (skb->pkt_type == PACKET_LOOPBACK || (need_strict && !is_ndisc)) { |
b4869aa2 DA |
1370 | skb->dev = vrf_dev; |
1371 | skb->skb_iif = vrf_dev->ifindex; | |
a04a480d | 1372 | IP6CB(skb)->flags |= IP6SKB_L3SLAVE; |
603113c5 | 1373 | |
6f12fa77 MM |
1374 | if (skb->pkt_type == PACKET_LOOPBACK) |
1375 | skb->pkt_type = PACKET_HOST; | |
f2575c8f | 1376 | else |
603113c5 AT |
1377 | vrf_ip6_input_dst(skb, vrf_dev, orig_iif); |
1378 | ||
b4869aa2 DA |
1379 | goto out; |
1380 | } | |
1381 | ||
6f12fa77 MM |
1382 | /* if packet is NDISC then keep the ingress interface */ |
1383 | if (!is_ndisc) { | |
012d69fb EB |
1384 | struct net_device *orig_dev = skb->dev; |
1385 | ||
926d93a3 | 1386 | vrf_rx_stats(vrf_dev, skb->len); |
74b20582 DA |
1387 | skb->dev = vrf_dev; |
1388 | skb->skb_iif = vrf_dev->ifindex; | |
1389 | ||
a9ec54d1 | 1390 | if (!list_empty(&vrf_dev->ptype_all)) { |
04893908 AM |
1391 | int err; |
1392 | ||
1393 | err = vrf_add_mac_header_if_unset(skb, vrf_dev, | |
012d69fb EB |
1394 | ETH_P_IPV6, |
1395 | orig_dev); | |
04893908 AM |
1396 | if (likely(!err)) { |
1397 | skb_push(skb, skb->mac_len); | |
1398 | dev_queue_xmit_nit(skb, vrf_dev); | |
1399 | skb_pull(skb, skb->mac_len); | |
1400 | } | |
a9ec54d1 | 1401 | } |
74b20582 DA |
1402 | |
1403 | IP6CB(skb)->flags |= IP6SKB_L3SLAVE; | |
1404 | } | |
1405 | ||
9ff74384 DA |
1406 | if (need_strict) |
1407 | vrf_ip6_input_dst(skb, vrf_dev, orig_iif); | |
1408 | ||
73e20b76 | 1409 | skb = vrf_rcv_nfhook(NFPROTO_IPV6, NF_INET_PRE_ROUTING, skb, vrf_dev); |
b4869aa2 | 1410 | out: |
74b20582 DA |
1411 | return skb; |
1412 | } | |
1413 | ||
1414 | #else | |
1415 | static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev, | |
1416 | struct sk_buff *skb) | |
1417 | { | |
1418 | return skb; | |
1419 | } | |
1420 | #endif | |
1421 | ||
1422 | static struct sk_buff *vrf_ip_rcv(struct net_device *vrf_dev, | |
1423 | struct sk_buff *skb) | |
1424 | { | |
012d69fb EB |
1425 | struct net_device *orig_dev = skb->dev; |
1426 | ||
74b20582 DA |
1427 | skb->dev = vrf_dev; |
1428 | skb->skb_iif = vrf_dev->ifindex; | |
a04a480d | 1429 | IPCB(skb)->flags |= IPSKB_L3SLAVE; |
74b20582 | 1430 | |
e58e4159 DA |
1431 | if (ipv4_is_multicast(ip_hdr(skb)->daddr)) |
1432 | goto out; | |
1433 | ||
afe80a49 DA |
1434 | /* loopback traffic; do not push through packet taps again. |
1435 | * Reset pkt_type for upper layers to process skb | |
1436 | */ | |
1437 | if (skb->pkt_type == PACKET_LOOPBACK) { | |
1438 | skb->pkt_type = PACKET_HOST; | |
1439 | goto out; | |
1440 | } | |
1441 | ||
926d93a3 DA |
1442 | vrf_rx_stats(vrf_dev, skb->len); |
1443 | ||
dcdd43c4 | 1444 | if (!list_empty(&vrf_dev->ptype_all)) { |
04893908 AM |
1445 | int err; |
1446 | ||
012d69fb EB |
1447 | err = vrf_add_mac_header_if_unset(skb, vrf_dev, ETH_P_IP, |
1448 | orig_dev); | |
04893908 AM |
1449 | if (likely(!err)) { |
1450 | skb_push(skb, skb->mac_len); | |
1451 | dev_queue_xmit_nit(skb, vrf_dev); | |
1452 | skb_pull(skb, skb->mac_len); | |
1453 | } | |
dcdd43c4 | 1454 | } |
74b20582 | 1455 | |
73e20b76 | 1456 | skb = vrf_rcv_nfhook(NFPROTO_IPV4, NF_INET_PRE_ROUTING, skb, vrf_dev); |
afe80a49 | 1457 | out: |
74b20582 DA |
1458 | return skb; |
1459 | } | |
1460 | ||
1461 | /* called with rcu lock held */ | |
1462 | static struct sk_buff *vrf_l3_rcv(struct net_device *vrf_dev, | |
1463 | struct sk_buff *skb, | |
1464 | u16 proto) | |
1465 | { | |
1466 | switch (proto) { | |
1467 | case AF_INET: | |
1468 | return vrf_ip_rcv(vrf_dev, skb); | |
1469 | case AF_INET6: | |
1470 | return vrf_ip6_rcv(vrf_dev, skb); | |
1471 | } | |
1472 | ||
1473 | return skb; | |
1474 | } | |
1475 | ||
35402e31 | 1476 | #if IS_ENABLED(CONFIG_IPV6) |
4c1feac5 DA |
1477 | /* send to link-local or multicast address via interface enslaved to |
1478 | * VRF device. Force lookup to VRF table without changing flow struct | |
7d9e5f42 WW |
1479 | * Note: Caller to this function must hold rcu_read_lock() and no refcnt |
1480 | * is taken on the dst by this function. | |
4c1feac5 DA |
1481 | */ |
1482 | static struct dst_entry *vrf_link_scope_lookup(const struct net_device *dev, | |
1483 | struct flowi6 *fl6) | |
35402e31 | 1484 | { |
9ff74384 | 1485 | struct net *net = dev_net(dev); |
7d9e5f42 | 1486 | int flags = RT6_LOOKUP_F_IFACE | RT6_LOOKUP_F_DST_NOREF; |
b0e95ccd | 1487 | struct dst_entry *dst = NULL; |
9ff74384 | 1488 | struct rt6_info *rt; |
35402e31 | 1489 | |
4c1feac5 DA |
1490 | /* VRF device does not have a link-local address and |
1491 | * sending packets to link-local or mcast addresses over | |
1492 | * a VRF device does not make sense | |
1493 | */ | |
1494 | if (fl6->flowi6_oif == dev->ifindex) { | |
1495 | dst = &net->ipv6.ip6_null_entry->dst; | |
4c1feac5 | 1496 | return dst; |
35402e31 DA |
1497 | } |
1498 | ||
4c1feac5 DA |
1499 | if (!ipv6_addr_any(&fl6->saddr)) |
1500 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
1501 | ||
b75cc8f9 | 1502 | rt = vrf_ip6_route_lookup(net, dev, fl6, fl6->flowi6_oif, NULL, flags); |
4c1feac5 DA |
1503 | if (rt) |
1504 | dst = &rt->dst; | |
9ff74384 | 1505 | |
b0e95ccd | 1506 | return dst; |
35402e31 DA |
1507 | } |
1508 | #endif | |
1509 | ||
ee15ee5d DA |
1510 | static const struct l3mdev_ops vrf_l3mdev_ops = { |
1511 | .l3mdev_fib_table = vrf_fib_table, | |
74b20582 | 1512 | .l3mdev_l3_rcv = vrf_l3_rcv, |
ebfc102c | 1513 | .l3mdev_l3_out = vrf_l3_out, |
35402e31 | 1514 | #if IS_ENABLED(CONFIG_IPV6) |
4c1feac5 | 1515 | .l3mdev_link_scope_lookup = vrf_link_scope_lookup, |
35402e31 | 1516 | #endif |
ee15ee5d DA |
1517 | }; |
1518 | ||
193125db DA |
1519 | static void vrf_get_drvinfo(struct net_device *dev, |
1520 | struct ethtool_drvinfo *info) | |
1521 | { | |
fb3ceec1 WS |
1522 | strscpy(info->driver, DRV_NAME, sizeof(info->driver)); |
1523 | strscpy(info->version, DRV_VERSION, sizeof(info->version)); | |
193125db DA |
1524 | } |
1525 | ||
1526 | static const struct ethtool_ops vrf_ethtool_ops = { | |
1527 | .get_drvinfo = vrf_get_drvinfo, | |
1528 | }; | |
1529 | ||
1aa6c4f6 DA |
1530 | static inline size_t vrf_fib_rule_nl_size(void) |
1531 | { | |
1532 | size_t sz; | |
1533 | ||
1534 | sz = NLMSG_ALIGN(sizeof(struct fib_rule_hdr)); | |
1535 | sz += nla_total_size(sizeof(u8)); /* FRA_L3MDEV */ | |
1536 | sz += nla_total_size(sizeof(u32)); /* FRA_PRIORITY */ | |
1b71af60 | 1537 | sz += nla_total_size(sizeof(u8)); /* FRA_PROTOCOL */ |
1aa6c4f6 DA |
1538 | |
1539 | return sz; | |
1540 | } | |
1541 | ||
1542 | static int vrf_fib_rule(const struct net_device *dev, __u8 family, bool add_it) | |
1543 | { | |
1544 | struct fib_rule_hdr *frh; | |
1545 | struct nlmsghdr *nlh; | |
1546 | struct sk_buff *skb; | |
1547 | int err; | |
1548 | ||
dac91170 DA |
1549 | if ((family == AF_INET6 || family == RTNL_FAMILY_IP6MR) && |
1550 | !ipv6_mod_enabled()) | |
e4348637 DA |
1551 | return 0; |
1552 | ||
1aa6c4f6 DA |
1553 | skb = nlmsg_new(vrf_fib_rule_nl_size(), GFP_KERNEL); |
1554 | if (!skb) | |
1555 | return -ENOMEM; | |
1556 | ||
1557 | nlh = nlmsg_put(skb, 0, 0, 0, sizeof(*frh), 0); | |
1558 | if (!nlh) | |
1559 | goto nla_put_failure; | |
1560 | ||
1561 | /* rule only needs to appear once */ | |
426c87ca | 1562 | nlh->nlmsg_flags |= NLM_F_EXCL; |
1aa6c4f6 DA |
1563 | |
1564 | frh = nlmsg_data(nlh); | |
1565 | memset(frh, 0, sizeof(*frh)); | |
1566 | frh->family = family; | |
1567 | frh->action = FR_ACT_TO_TBL; | |
1b71af60 DS |
1568 | |
1569 | if (nla_put_u8(skb, FRA_PROTOCOL, RTPROT_KERNEL)) | |
1570 | goto nla_put_failure; | |
1aa6c4f6 | 1571 | |
18129a24 | 1572 | if (nla_put_u8(skb, FRA_L3MDEV, 1)) |
1aa6c4f6 DA |
1573 | goto nla_put_failure; |
1574 | ||
1575 | if (nla_put_u32(skb, FRA_PRIORITY, FIB_RULE_PREF)) | |
1576 | goto nla_put_failure; | |
1577 | ||
1578 | nlmsg_end(skb, nlh); | |
1579 | ||
1580 | /* fib_nl_{new,del}rule handling looks for net from skb->sk */ | |
1581 | skb->sk = dev_net(dev)->rtnl; | |
1582 | if (add_it) { | |
c21ef3e3 | 1583 | err = fib_nl_newrule(skb, nlh, NULL); |
1aa6c4f6 DA |
1584 | if (err == -EEXIST) |
1585 | err = 0; | |
1586 | } else { | |
c21ef3e3 | 1587 | err = fib_nl_delrule(skb, nlh, NULL); |
1aa6c4f6 DA |
1588 | if (err == -ENOENT) |
1589 | err = 0; | |
1590 | } | |
1591 | nlmsg_free(skb); | |
1592 | ||
1593 | return err; | |
1594 | ||
1595 | nla_put_failure: | |
1596 | nlmsg_free(skb); | |
1597 | ||
1598 | return -EMSGSIZE; | |
1599 | } | |
1600 | ||
1601 | static int vrf_add_fib_rules(const struct net_device *dev) | |
1602 | { | |
1603 | int err; | |
1604 | ||
1605 | err = vrf_fib_rule(dev, AF_INET, true); | |
1606 | if (err < 0) | |
1607 | goto out_err; | |
1608 | ||
1609 | err = vrf_fib_rule(dev, AF_INET6, true); | |
1610 | if (err < 0) | |
1611 | goto ipv6_err; | |
1612 | ||
e58e4159 DA |
1613 | #if IS_ENABLED(CONFIG_IP_MROUTE_MULTIPLE_TABLES) |
1614 | err = vrf_fib_rule(dev, RTNL_FAMILY_IPMR, true); | |
1615 | if (err < 0) | |
1616 | goto ipmr_err; | |
1617 | #endif | |
1618 | ||
e4a38c0c PR |
1619 | #if IS_ENABLED(CONFIG_IPV6_MROUTE_MULTIPLE_TABLES) |
1620 | err = vrf_fib_rule(dev, RTNL_FAMILY_IP6MR, true); | |
1621 | if (err < 0) | |
1622 | goto ip6mr_err; | |
1623 | #endif | |
1624 | ||
1aa6c4f6 DA |
1625 | return 0; |
1626 | ||
e4a38c0c PR |
1627 | #if IS_ENABLED(CONFIG_IPV6_MROUTE_MULTIPLE_TABLES) |
1628 | ip6mr_err: | |
1629 | vrf_fib_rule(dev, RTNL_FAMILY_IPMR, false); | |
1630 | #endif | |
1631 | ||
e58e4159 DA |
1632 | #if IS_ENABLED(CONFIG_IP_MROUTE_MULTIPLE_TABLES) |
1633 | ipmr_err: | |
1634 | vrf_fib_rule(dev, AF_INET6, false); | |
1635 | #endif | |
1636 | ||
1aa6c4f6 DA |
1637 | ipv6_err: |
1638 | vrf_fib_rule(dev, AF_INET, false); | |
1639 | ||
1640 | out_err: | |
1641 | netdev_err(dev, "Failed to add FIB rules.\n"); | |
1642 | return err; | |
1643 | } | |
1644 | ||
193125db DA |
1645 | static void vrf_setup(struct net_device *dev) |
1646 | { | |
1647 | ether_setup(dev); | |
1648 | ||
1649 | /* Initialize the device structure. */ | |
1650 | dev->netdev_ops = &vrf_netdev_ops; | |
ee15ee5d | 1651 | dev->l3mdev_ops = &vrf_l3mdev_ops; |
193125db | 1652 | dev->ethtool_ops = &vrf_ethtool_ops; |
cf124db5 | 1653 | dev->needs_free_netdev = true; |
193125db DA |
1654 | |
1655 | /* Fill in device structure with ethernet-generic values. */ | |
1656 | eth_hw_addr_random(dev); | |
1657 | ||
1658 | /* don't acquire vrf device's netif_tx_lock when transmitting */ | |
1659 | dev->features |= NETIF_F_LLTX; | |
1660 | ||
1661 | /* don't allow vrf devices to change network namespaces. */ | |
1662 | dev->features |= NETIF_F_NETNS_LOCAL; | |
7889681f DA |
1663 | |
1664 | /* does not make sense for a VLAN to be added to a vrf device */ | |
1665 | dev->features |= NETIF_F_VLAN_CHALLENGED; | |
1666 | ||
1667 | /* enable offload features */ | |
1668 | dev->features |= NETIF_F_GSO_SOFTWARE; | |
cb160394 | 1669 | dev->features |= NETIF_F_RXCSUM | NETIF_F_HW_CSUM | NETIF_F_SCTP_CRC; |
7889681f DA |
1670 | dev->features |= NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA; |
1671 | ||
1672 | dev->hw_features = dev->features; | |
1673 | dev->hw_enc_features = dev->features; | |
1674 | ||
1675 | /* default to no qdisc; user can add if desired */ | |
1676 | dev->priv_flags |= IFF_NO_QUEUE; | |
1017e098 | 1677 | dev->priv_flags |= IFF_NO_RX_HANDLER; |
6819e3f6 | 1678 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
ad49bc63 | 1679 | |
5055376a ML |
1680 | /* VRF devices do not care about MTU, but if the MTU is set |
1681 | * too low then the ipv4 and ipv6 protocols are disabled | |
1682 | * which breaks networking. | |
1683 | */ | |
1684 | dev->min_mtu = IPV6_MIN_MTU; | |
9bb392f6 ND |
1685 | dev->max_mtu = IP6_MAX_MTU; |
1686 | dev->mtu = dev->max_mtu; | |
34d21de9 DB |
1687 | |
1688 | dev->pcpu_stat_type = NETDEV_PCPU_STAT_DSTATS; | |
193125db DA |
1689 | } |
1690 | ||
a8b8a889 MS |
1691 | static int vrf_validate(struct nlattr *tb[], struct nlattr *data[], |
1692 | struct netlink_ext_ack *extack) | |
193125db DA |
1693 | { |
1694 | if (tb[IFLA_ADDRESS]) { | |
53b94835 DA |
1695 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) { |
1696 | NL_SET_ERR_MSG(extack, "Invalid hardware address"); | |
193125db | 1697 | return -EINVAL; |
53b94835 DA |
1698 | } |
1699 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) { | |
1700 | NL_SET_ERR_MSG(extack, "Invalid hardware address"); | |
193125db | 1701 | return -EADDRNOTAVAIL; |
53b94835 | 1702 | } |
193125db DA |
1703 | } |
1704 | return 0; | |
1705 | } | |
1706 | ||
1707 | static void vrf_dellink(struct net_device *dev, struct list_head *head) | |
1708 | { | |
f630c38e NA |
1709 | struct net_device *port_dev; |
1710 | struct list_head *iter; | |
1711 | ||
1712 | netdev_for_each_lower_dev(dev, port_dev, iter) | |
1713 | vrf_del_slave(dev, port_dev); | |
1714 | ||
c8baec38 AM |
1715 | vrf_map_unregister_dev(dev); |
1716 | ||
193125db DA |
1717 | unregister_netdevice_queue(dev, head); |
1718 | } | |
1719 | ||
1720 | static int vrf_newlink(struct net *src_net, struct net_device *dev, | |
7a3f4a18 MS |
1721 | struct nlattr *tb[], struct nlattr *data[], |
1722 | struct netlink_ext_ack *extack) | |
193125db DA |
1723 | { |
1724 | struct net_vrf *vrf = netdev_priv(dev); | |
c8baec38 | 1725 | struct netns_vrf *nn_vrf; |
097d3c95 DA |
1726 | bool *add_fib_rules; |
1727 | struct net *net; | |
1aa6c4f6 | 1728 | int err; |
193125db | 1729 | |
53b94835 DA |
1730 | if (!data || !data[IFLA_VRF_TABLE]) { |
1731 | NL_SET_ERR_MSG(extack, "VRF table id is missing"); | |
193125db | 1732 | return -EINVAL; |
53b94835 | 1733 | } |
193125db DA |
1734 | |
1735 | vrf->tb_id = nla_get_u32(data[IFLA_VRF_TABLE]); | |
53b94835 DA |
1736 | if (vrf->tb_id == RT_TABLE_UNSPEC) { |
1737 | NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VRF_TABLE], | |
1738 | "Invalid VRF table id"); | |
24c63bbc | 1739 | return -EINVAL; |
53b94835 | 1740 | } |
193125db | 1741 | |
007979ea | 1742 | dev->priv_flags |= IFF_L3MDEV_MASTER; |
193125db | 1743 | |
1aa6c4f6 DA |
1744 | err = register_netdevice(dev); |
1745 | if (err) | |
1746 | goto out; | |
1747 | ||
c8baec38 AM |
1748 | /* mapping between table_id and vrf; |
1749 | * note: such binding could not be done in the dev init function | |
1750 | * because dev->ifindex id is not available yet. | |
1751 | */ | |
1752 | vrf->ifindex = dev->ifindex; | |
1753 | ||
1754 | err = vrf_map_register_dev(dev, extack); | |
1755 | if (err) { | |
1756 | unregister_netdevice(dev); | |
1757 | goto out; | |
1758 | } | |
1759 | ||
097d3c95 | 1760 | net = dev_net(dev); |
c8baec38 AM |
1761 | nn_vrf = net_generic(net, vrf_net_id); |
1762 | ||
1763 | add_fib_rules = &nn_vrf->add_fib_rules; | |
097d3c95 | 1764 | if (*add_fib_rules) { |
1aa6c4f6 DA |
1765 | err = vrf_add_fib_rules(dev); |
1766 | if (err) { | |
c8baec38 | 1767 | vrf_map_unregister_dev(dev); |
1aa6c4f6 DA |
1768 | unregister_netdevice(dev); |
1769 | goto out; | |
1770 | } | |
097d3c95 | 1771 | *add_fib_rules = false; |
1aa6c4f6 DA |
1772 | } |
1773 | ||
1774 | out: | |
1775 | return err; | |
193125db DA |
1776 | } |
1777 | ||
1778 | static size_t vrf_nl_getsize(const struct net_device *dev) | |
1779 | { | |
1780 | return nla_total_size(sizeof(u32)); /* IFLA_VRF_TABLE */ | |
1781 | } | |
1782 | ||
1783 | static int vrf_fillinfo(struct sk_buff *skb, | |
1784 | const struct net_device *dev) | |
1785 | { | |
1786 | struct net_vrf *vrf = netdev_priv(dev); | |
1787 | ||
1788 | return nla_put_u32(skb, IFLA_VRF_TABLE, vrf->tb_id); | |
1789 | } | |
1790 | ||
67eb0331 DA |
1791 | static size_t vrf_get_slave_size(const struct net_device *bond_dev, |
1792 | const struct net_device *slave_dev) | |
1793 | { | |
1794 | return nla_total_size(sizeof(u32)); /* IFLA_VRF_PORT_TABLE */ | |
1795 | } | |
1796 | ||
1797 | static int vrf_fill_slave_info(struct sk_buff *skb, | |
1798 | const struct net_device *vrf_dev, | |
1799 | const struct net_device *slave_dev) | |
1800 | { | |
1801 | struct net_vrf *vrf = netdev_priv(vrf_dev); | |
1802 | ||
1803 | if (nla_put_u32(skb, IFLA_VRF_PORT_TABLE, vrf->tb_id)) | |
1804 | return -EMSGSIZE; | |
1805 | ||
1806 | return 0; | |
1807 | } | |
1808 | ||
193125db DA |
1809 | static const struct nla_policy vrf_nl_policy[IFLA_VRF_MAX + 1] = { |
1810 | [IFLA_VRF_TABLE] = { .type = NLA_U32 }, | |
1811 | }; | |
1812 | ||
1813 | static struct rtnl_link_ops vrf_link_ops __read_mostly = { | |
1814 | .kind = DRV_NAME, | |
1815 | .priv_size = sizeof(struct net_vrf), | |
1816 | ||
1817 | .get_size = vrf_nl_getsize, | |
1818 | .policy = vrf_nl_policy, | |
1819 | .validate = vrf_validate, | |
1820 | .fill_info = vrf_fillinfo, | |
1821 | ||
67eb0331 DA |
1822 | .get_slave_size = vrf_get_slave_size, |
1823 | .fill_slave_info = vrf_fill_slave_info, | |
1824 | ||
193125db DA |
1825 | .newlink = vrf_newlink, |
1826 | .dellink = vrf_dellink, | |
1827 | .setup = vrf_setup, | |
1828 | .maxtype = IFLA_VRF_MAX, | |
1829 | }; | |
1830 | ||
1831 | static int vrf_device_event(struct notifier_block *unused, | |
1832 | unsigned long event, void *ptr) | |
1833 | { | |
1834 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
1835 | ||
1836 | /* only care about unregister events to drop slave references */ | |
1837 | if (event == NETDEV_UNREGISTER) { | |
193125db DA |
1838 | struct net_device *vrf_dev; |
1839 | ||
fee6d4c7 | 1840 | if (!netif_is_l3_slave(dev)) |
193125db DA |
1841 | goto out; |
1842 | ||
58aa9087 NA |
1843 | vrf_dev = netdev_master_upper_dev_get(dev); |
1844 | vrf_del_slave(vrf_dev, dev); | |
193125db DA |
1845 | } |
1846 | out: | |
1847 | return NOTIFY_DONE; | |
1848 | } | |
1849 | ||
1850 | static struct notifier_block vrf_notifier_block __read_mostly = { | |
1851 | .notifier_call = vrf_device_event, | |
1852 | }; | |
1853 | ||
c8baec38 AM |
1854 | static int vrf_map_init(struct vrf_map *vmap) |
1855 | { | |
1856 | spin_lock_init(&vmap->vmap_lock); | |
1857 | hash_init(vmap->ht); | |
1858 | ||
1859 | vmap->strict_mode = false; | |
1860 | ||
1861 | return 0; | |
1862 | } | |
1863 | ||
1b6687e3 DA |
1864 | #ifdef CONFIG_SYSCTL |
1865 | static bool vrf_strict_mode(struct vrf_map *vmap) | |
1866 | { | |
1867 | bool strict_mode; | |
1868 | ||
1869 | vrf_map_lock(vmap); | |
1870 | strict_mode = vmap->strict_mode; | |
1871 | vrf_map_unlock(vmap); | |
1872 | ||
1873 | return strict_mode; | |
1874 | } | |
1875 | ||
1876 | static int vrf_strict_mode_change(struct vrf_map *vmap, bool new_mode) | |
1877 | { | |
1878 | bool *cur_mode; | |
1879 | int res = 0; | |
1880 | ||
1881 | vrf_map_lock(vmap); | |
1882 | ||
1883 | cur_mode = &vmap->strict_mode; | |
1884 | if (*cur_mode == new_mode) | |
1885 | goto unlock; | |
1886 | ||
1887 | if (*cur_mode) { | |
1888 | /* disable strict mode */ | |
1889 | *cur_mode = false; | |
1890 | } else { | |
1891 | if (vmap->shared_tables) { | |
1892 | /* we cannot allow strict_mode because there are some | |
1893 | * vrfs that share one or more tables. | |
1894 | */ | |
1895 | res = -EBUSY; | |
1896 | goto unlock; | |
1897 | } | |
1898 | ||
1899 | /* no tables are shared among vrfs, so we can go back | |
1900 | * to 1:1 association between a vrf with its table. | |
1901 | */ | |
1902 | *cur_mode = true; | |
1903 | } | |
1904 | ||
1905 | unlock: | |
1906 | vrf_map_unlock(vmap); | |
1907 | ||
1908 | return res; | |
1909 | } | |
1910 | ||
33306f1a AM |
1911 | static int vrf_shared_table_handler(struct ctl_table *table, int write, |
1912 | void *buffer, size_t *lenp, loff_t *ppos) | |
1913 | { | |
1914 | struct net *net = (struct net *)table->extra1; | |
1915 | struct vrf_map *vmap = netns_vrf_map(net); | |
1916 | int proc_strict_mode = 0; | |
1917 | struct ctl_table tmp = { | |
1918 | .procname = table->procname, | |
1919 | .data = &proc_strict_mode, | |
1920 | .maxlen = sizeof(int), | |
1921 | .mode = table->mode, | |
1922 | .extra1 = SYSCTL_ZERO, | |
1923 | .extra2 = SYSCTL_ONE, | |
1924 | }; | |
1925 | int ret; | |
1926 | ||
1927 | if (!write) | |
1928 | proc_strict_mode = vrf_strict_mode(vmap); | |
1929 | ||
1930 | ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); | |
1931 | ||
1932 | if (write && ret == 0) | |
1933 | ret = vrf_strict_mode_change(vmap, (bool)proc_strict_mode); | |
1934 | ||
1935 | return ret; | |
1936 | } | |
1937 | ||
1938 | static const struct ctl_table vrf_table[] = { | |
1939 | { | |
1940 | .procname = "strict_mode", | |
1941 | .data = NULL, | |
1942 | .maxlen = sizeof(int), | |
1943 | .mode = 0644, | |
1944 | .proc_handler = vrf_shared_table_handler, | |
1945 | /* set by the vrf_netns_init */ | |
1946 | .extra1 = NULL, | |
1947 | }, | |
33306f1a AM |
1948 | }; |
1949 | ||
1b6687e3 | 1950 | static int vrf_netns_init_sysctl(struct net *net, struct netns_vrf *nn_vrf) |
097d3c95 | 1951 | { |
33306f1a | 1952 | struct ctl_table *table; |
097d3c95 | 1953 | |
33306f1a AM |
1954 | table = kmemdup(vrf_table, sizeof(vrf_table), GFP_KERNEL); |
1955 | if (!table) | |
1956 | return -ENOMEM; | |
1957 | ||
1958 | /* init the extra1 parameter with the reference to current netns */ | |
1959 | table[0].extra1 = net; | |
1960 | ||
3ca9aa74 JG |
1961 | nn_vrf->ctl_hdr = register_net_sysctl_sz(net, "net/vrf", table, |
1962 | ARRAY_SIZE(vrf_table)); | |
33306f1a | 1963 | if (!nn_vrf->ctl_hdr) { |
1b6687e3 DA |
1964 | kfree(table); |
1965 | return -ENOMEM; | |
33306f1a AM |
1966 | } |
1967 | ||
097d3c95 | 1968 | return 0; |
33306f1a AM |
1969 | } |
1970 | ||
1b6687e3 | 1971 | static void vrf_netns_exit_sysctl(struct net *net) |
33306f1a AM |
1972 | { |
1973 | struct netns_vrf *nn_vrf = net_generic(net, vrf_net_id); | |
1974 | struct ctl_table *table; | |
1975 | ||
1976 | table = nn_vrf->ctl_hdr->ctl_table_arg; | |
1977 | unregister_net_sysctl_table(nn_vrf->ctl_hdr); | |
1978 | kfree(table); | |
097d3c95 | 1979 | } |
1b6687e3 DA |
1980 | #else |
1981 | static int vrf_netns_init_sysctl(struct net *net, struct netns_vrf *nn_vrf) | |
1982 | { | |
1983 | return 0; | |
1984 | } | |
1985 | ||
1986 | static void vrf_netns_exit_sysctl(struct net *net) | |
1987 | { | |
1988 | } | |
1989 | #endif | |
1990 | ||
1991 | /* Initialize per network namespace state */ | |
1992 | static int __net_init vrf_netns_init(struct net *net) | |
1993 | { | |
1994 | struct netns_vrf *nn_vrf = net_generic(net, vrf_net_id); | |
1995 | ||
1996 | nn_vrf->add_fib_rules = true; | |
1997 | vrf_map_init(&nn_vrf->vmap); | |
1998 | ||
1999 | return vrf_netns_init_sysctl(net, nn_vrf); | |
2000 | } | |
2001 | ||
2002 | static void __net_exit vrf_netns_exit(struct net *net) | |
2003 | { | |
2004 | vrf_netns_exit_sysctl(net); | |
2005 | } | |
097d3c95 DA |
2006 | |
2007 | static struct pernet_operations vrf_net_ops __net_initdata = { | |
2008 | .init = vrf_netns_init, | |
33306f1a | 2009 | .exit = vrf_netns_exit, |
097d3c95 | 2010 | .id = &vrf_net_id, |
c8baec38 | 2011 | .size = sizeof(struct netns_vrf), |
097d3c95 DA |
2012 | }; |
2013 | ||
193125db DA |
2014 | static int __init vrf_init_module(void) |
2015 | { | |
2016 | int rc; | |
2017 | ||
193125db DA |
2018 | register_netdevice_notifier(&vrf_notifier_block); |
2019 | ||
097d3c95 | 2020 | rc = register_pernet_subsys(&vrf_net_ops); |
193125db DA |
2021 | if (rc < 0) |
2022 | goto error; | |
2023 | ||
a59a8ffd AM |
2024 | rc = l3mdev_table_lookup_register(L3MDEV_TYPE_VRF, |
2025 | vrf_ifindex_lookup_by_table_id); | |
2026 | if (rc < 0) | |
2027 | goto unreg_pernet; | |
2028 | ||
097d3c95 | 2029 | rc = rtnl_link_register(&vrf_link_ops); |
a59a8ffd AM |
2030 | if (rc < 0) |
2031 | goto table_lookup_unreg; | |
097d3c95 | 2032 | |
193125db DA |
2033 | return 0; |
2034 | ||
a59a8ffd AM |
2035 | table_lookup_unreg: |
2036 | l3mdev_table_lookup_unregister(L3MDEV_TYPE_VRF, | |
2037 | vrf_ifindex_lookup_by_table_id); | |
2038 | ||
2039 | unreg_pernet: | |
2040 | unregister_pernet_subsys(&vrf_net_ops); | |
2041 | ||
193125db DA |
2042 | error: |
2043 | unregister_netdevice_notifier(&vrf_notifier_block); | |
193125db DA |
2044 | return rc; |
2045 | } | |
2046 | ||
193125db | 2047 | module_init(vrf_init_module); |
193125db DA |
2048 | MODULE_AUTHOR("Shrijeet Mukherjee, David Ahern"); |
2049 | MODULE_DESCRIPTION("Device driver to instantiate VRF domains"); | |
2050 | MODULE_LICENSE("GPL"); | |
2051 | MODULE_ALIAS_RTNL_LINK(DRV_NAME); | |
2052 | MODULE_VERSION(DRV_VERSION); |