Commit | Line | Data |
---|---|---|
193125db DA |
1 | /* |
2 | * vrf.c: device driver to encapsulate a VRF space | |
3 | * | |
4 | * Copyright (c) 2015 Cumulus Networks. All rights reserved. | |
5 | * Copyright (c) 2015 Shrijeet Mukherjee <shm@cumulusnetworks.com> | |
6 | * Copyright (c) 2015 David Ahern <dsa@cumulusnetworks.com> | |
7 | * | |
8 | * Based on dummy, team and ipvlan drivers | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | */ | |
15 | ||
16 | #include <linux/module.h> | |
17 | #include <linux/kernel.h> | |
18 | #include <linux/netdevice.h> | |
19 | #include <linux/etherdevice.h> | |
20 | #include <linux/ip.h> | |
21 | #include <linux/init.h> | |
22 | #include <linux/moduleparam.h> | |
23 | #include <linux/netfilter.h> | |
24 | #include <linux/rtnetlink.h> | |
25 | #include <net/rtnetlink.h> | |
26 | #include <linux/u64_stats_sync.h> | |
27 | #include <linux/hashtable.h> | |
28 | ||
29 | #include <linux/inetdevice.h> | |
8f58336d | 30 | #include <net/arp.h> |
193125db DA |
31 | #include <net/ip.h> |
32 | #include <net/ip_fib.h> | |
35402e31 | 33 | #include <net/ip6_fib.h> |
193125db | 34 | #include <net/ip6_route.h> |
193125db DA |
35 | #include <net/route.h> |
36 | #include <net/addrconf.h> | |
ee15ee5d | 37 | #include <net/l3mdev.h> |
1aa6c4f6 | 38 | #include <net/fib_rules.h> |
097d3c95 | 39 | #include <net/netns/generic.h> |
193125db DA |
40 | |
41 | #define DRV_NAME "vrf" | |
42 | #define DRV_VERSION "1.0" | |
43 | ||
1aa6c4f6 | 44 | #define FIB_RULE_PREF 1000 /* default preference for FIB rules */ |
097d3c95 DA |
45 | |
46 | static unsigned int vrf_net_id; | |
1aa6c4f6 | 47 | |
ec539514 | 48 | struct net_vrf { |
b0e95ccd | 49 | struct rtable __rcu *rth; |
afe80a49 | 50 | struct rtable __rcu *rth_local; |
b0e95ccd | 51 | struct rt6_info __rcu *rt6; |
b4869aa2 | 52 | struct rt6_info __rcu *rt6_local; |
ec539514 DA |
53 | u32 tb_id; |
54 | }; | |
55 | ||
193125db DA |
56 | struct pcpu_dstats { |
57 | u64 tx_pkts; | |
58 | u64 tx_bytes; | |
59 | u64 tx_drps; | |
60 | u64 rx_pkts; | |
61 | u64 rx_bytes; | |
afe80a49 | 62 | u64 rx_drps; |
193125db DA |
63 | struct u64_stats_sync syncp; |
64 | }; | |
65 | ||
afe80a49 DA |
66 | static void vrf_rx_stats(struct net_device *dev, int len) |
67 | { | |
68 | struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats); | |
69 | ||
70 | u64_stats_update_begin(&dstats->syncp); | |
71 | dstats->rx_pkts++; | |
72 | dstats->rx_bytes += len; | |
73 | u64_stats_update_end(&dstats->syncp); | |
74 | } | |
75 | ||
57b8efa1 NA |
76 | static void vrf_tx_error(struct net_device *vrf_dev, struct sk_buff *skb) |
77 | { | |
78 | vrf_dev->stats.tx_errors++; | |
79 | kfree_skb(skb); | |
80 | } | |
81 | ||
bc1f4470 | 82 | static void vrf_get_stats64(struct net_device *dev, |
83 | struct rtnl_link_stats64 *stats) | |
193125db DA |
84 | { |
85 | int i; | |
86 | ||
87 | for_each_possible_cpu(i) { | |
88 | const struct pcpu_dstats *dstats; | |
89 | u64 tbytes, tpkts, tdrops, rbytes, rpkts; | |
90 | unsigned int start; | |
91 | ||
92 | dstats = per_cpu_ptr(dev->dstats, i); | |
93 | do { | |
94 | start = u64_stats_fetch_begin_irq(&dstats->syncp); | |
95 | tbytes = dstats->tx_bytes; | |
96 | tpkts = dstats->tx_pkts; | |
97 | tdrops = dstats->tx_drps; | |
98 | rbytes = dstats->rx_bytes; | |
99 | rpkts = dstats->rx_pkts; | |
100 | } while (u64_stats_fetch_retry_irq(&dstats->syncp, start)); | |
101 | stats->tx_bytes += tbytes; | |
102 | stats->tx_packets += tpkts; | |
103 | stats->tx_dropped += tdrops; | |
104 | stats->rx_bytes += rbytes; | |
105 | stats->rx_packets += rpkts; | |
106 | } | |
193125db DA |
107 | } |
108 | ||
dcdd43c4 DA |
109 | /* by default VRF devices do not have a qdisc and are expected |
110 | * to be created with only a single queue. | |
111 | */ | |
112 | static bool qdisc_tx_is_default(const struct net_device *dev) | |
113 | { | |
114 | struct netdev_queue *txq; | |
115 | struct Qdisc *qdisc; | |
116 | ||
117 | if (dev->num_tx_queues > 1) | |
118 | return false; | |
119 | ||
120 | txq = netdev_get_tx_queue(dev, 0); | |
121 | qdisc = rcu_access_pointer(txq->qdisc); | |
122 | ||
123 | return !qdisc->enqueue; | |
124 | } | |
125 | ||
afe80a49 DA |
126 | /* Local traffic destined to local address. Reinsert the packet to rx |
127 | * path, similar to loopback handling. | |
128 | */ | |
129 | static int vrf_local_xmit(struct sk_buff *skb, struct net_device *dev, | |
130 | struct dst_entry *dst) | |
131 | { | |
132 | int len = skb->len; | |
133 | ||
134 | skb_orphan(skb); | |
135 | ||
136 | skb_dst_set(skb, dst); | |
137 | skb_dst_force(skb); | |
138 | ||
139 | /* set pkt_type to avoid skb hitting packet taps twice - | |
140 | * once on Tx and again in Rx processing | |
141 | */ | |
142 | skb->pkt_type = PACKET_LOOPBACK; | |
143 | ||
144 | skb->protocol = eth_type_trans(skb, dev); | |
145 | ||
146 | if (likely(netif_rx(skb) == NET_RX_SUCCESS)) | |
147 | vrf_rx_stats(dev, len); | |
148 | else | |
149 | this_cpu_inc(dev->dstats->rx_drps); | |
150 | ||
151 | return NETDEV_TX_OK; | |
152 | } | |
153 | ||
35402e31 | 154 | #if IS_ENABLED(CONFIG_IPV6) |
4c1feac5 DA |
155 | static int vrf_ip6_local_out(struct net *net, struct sock *sk, |
156 | struct sk_buff *skb) | |
157 | { | |
158 | int err; | |
159 | ||
160 | err = nf_hook(NFPROTO_IPV6, NF_INET_LOCAL_OUT, net, | |
161 | sk, skb, NULL, skb_dst(skb)->dev, dst_output); | |
162 | ||
163 | if (likely(err == 1)) | |
164 | err = dst_output(net, sk, skb); | |
165 | ||
166 | return err; | |
167 | } | |
168 | ||
35402e31 DA |
169 | static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb, |
170 | struct net_device *dev) | |
171 | { | |
172 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
173 | struct net *net = dev_net(skb->dev); | |
174 | struct flowi6 fl6 = { | |
175 | /* needed to match OIF rule */ | |
176 | .flowi6_oif = dev->ifindex, | |
177 | .flowi6_iif = LOOPBACK_IFINDEX, | |
178 | .daddr = iph->daddr, | |
179 | .saddr = iph->saddr, | |
180 | .flowlabel = ip6_flowinfo(iph), | |
181 | .flowi6_mark = skb->mark, | |
182 | .flowi6_proto = iph->nexthdr, | |
c71ad3d4 | 183 | .flowi6_flags = FLOWI_FLAG_SKIP_NH_OIF, |
35402e31 DA |
184 | }; |
185 | int ret = NET_XMIT_DROP; | |
186 | struct dst_entry *dst; | |
187 | struct dst_entry *dst_null = &net->ipv6.ip6_null_entry->dst; | |
188 | ||
189 | dst = ip6_route_output(net, NULL, &fl6); | |
190 | if (dst == dst_null) | |
191 | goto err; | |
192 | ||
193 | skb_dst_drop(skb); | |
b4869aa2 DA |
194 | |
195 | /* if dst.dev is loopback or the VRF device again this is locally | |
196 | * originated traffic destined to a local address. Short circuit | |
197 | * to Rx path using our local dst | |
198 | */ | |
199 | if (dst->dev == net->loopback_dev || dst->dev == dev) { | |
200 | struct net_vrf *vrf = netdev_priv(dev); | |
201 | struct rt6_info *rt6_local; | |
202 | ||
203 | /* release looked up dst and use cached local dst */ | |
204 | dst_release(dst); | |
205 | ||
206 | rcu_read_lock(); | |
207 | ||
208 | rt6_local = rcu_dereference(vrf->rt6_local); | |
209 | if (unlikely(!rt6_local)) { | |
210 | rcu_read_unlock(); | |
211 | goto err; | |
212 | } | |
213 | ||
214 | /* Ordering issue: cached local dst is created on newlink | |
215 | * before the IPv6 initialization. Using the local dst | |
216 | * requires rt6i_idev to be set so make sure it is. | |
217 | */ | |
218 | if (unlikely(!rt6_local->rt6i_idev)) { | |
219 | rt6_local->rt6i_idev = in6_dev_get(dev); | |
220 | if (!rt6_local->rt6i_idev) { | |
221 | rcu_read_unlock(); | |
222 | goto err; | |
223 | } | |
224 | } | |
225 | ||
226 | dst = &rt6_local->dst; | |
227 | dst_hold(dst); | |
228 | ||
229 | rcu_read_unlock(); | |
230 | ||
231 | return vrf_local_xmit(skb, dev, &rt6_local->dst); | |
232 | } | |
233 | ||
35402e31 DA |
234 | skb_dst_set(skb, dst); |
235 | ||
911a66fb DA |
236 | /* strip the ethernet header added for pass through VRF device */ |
237 | __skb_pull(skb, skb_network_offset(skb)); | |
238 | ||
4c1feac5 | 239 | ret = vrf_ip6_local_out(net, skb->sk, skb); |
35402e31 DA |
240 | if (unlikely(net_xmit_eval(ret))) |
241 | dev->stats.tx_errors++; | |
242 | else | |
243 | ret = NET_XMIT_SUCCESS; | |
244 | ||
245 | return ret; | |
246 | err: | |
247 | vrf_tx_error(dev, skb); | |
248 | return NET_XMIT_DROP; | |
249 | } | |
250 | #else | |
193125db DA |
251 | static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb, |
252 | struct net_device *dev) | |
253 | { | |
57b8efa1 NA |
254 | vrf_tx_error(dev, skb); |
255 | return NET_XMIT_DROP; | |
193125db | 256 | } |
35402e31 | 257 | #endif |
193125db | 258 | |
ebfc102c DA |
259 | /* based on ip_local_out; can't use it b/c the dst is switched pointing to us */ |
260 | static int vrf_ip_local_out(struct net *net, struct sock *sk, | |
261 | struct sk_buff *skb) | |
262 | { | |
263 | int err; | |
264 | ||
265 | err = nf_hook(NFPROTO_IPV4, NF_INET_LOCAL_OUT, net, sk, | |
266 | skb, NULL, skb_dst(skb)->dev, dst_output); | |
267 | if (likely(err == 1)) | |
268 | err = dst_output(net, sk, skb); | |
269 | ||
270 | return err; | |
271 | } | |
272 | ||
193125db DA |
273 | static netdev_tx_t vrf_process_v4_outbound(struct sk_buff *skb, |
274 | struct net_device *vrf_dev) | |
275 | { | |
276 | struct iphdr *ip4h = ip_hdr(skb); | |
277 | int ret = NET_XMIT_DROP; | |
278 | struct flowi4 fl4 = { | |
279 | /* needed to match OIF rule */ | |
280 | .flowi4_oif = vrf_dev->ifindex, | |
281 | .flowi4_iif = LOOPBACK_IFINDEX, | |
282 | .flowi4_tos = RT_TOS(ip4h->tos), | |
c71ad3d4 | 283 | .flowi4_flags = FLOWI_FLAG_ANYSRC | FLOWI_FLAG_SKIP_NH_OIF, |
7a18c5b9 | 284 | .flowi4_proto = ip4h->protocol, |
193125db | 285 | .daddr = ip4h->daddr, |
7a18c5b9 | 286 | .saddr = ip4h->saddr, |
193125db | 287 | }; |
911a66fb DA |
288 | struct net *net = dev_net(vrf_dev); |
289 | struct rtable *rt; | |
290 | ||
291 | rt = ip_route_output_flow(net, &fl4, NULL); | |
292 | if (IS_ERR(rt)) | |
293 | goto err; | |
193125db | 294 | |
911a66fb | 295 | skb_dst_drop(skb); |
afe80a49 DA |
296 | |
297 | /* if dst.dev is loopback or the VRF device again this is locally | |
298 | * originated traffic destined to a local address. Short circuit | |
299 | * to Rx path using our local dst | |
300 | */ | |
301 | if (rt->dst.dev == net->loopback_dev || rt->dst.dev == vrf_dev) { | |
302 | struct net_vrf *vrf = netdev_priv(vrf_dev); | |
303 | struct rtable *rth_local; | |
304 | struct dst_entry *dst = NULL; | |
305 | ||
306 | ip_rt_put(rt); | |
307 | ||
308 | rcu_read_lock(); | |
309 | ||
310 | rth_local = rcu_dereference(vrf->rth_local); | |
311 | if (likely(rth_local)) { | |
312 | dst = &rth_local->dst; | |
313 | dst_hold(dst); | |
314 | } | |
315 | ||
316 | rcu_read_unlock(); | |
317 | ||
318 | if (unlikely(!dst)) | |
319 | goto err; | |
320 | ||
321 | return vrf_local_xmit(skb, vrf_dev, dst); | |
322 | } | |
323 | ||
911a66fb DA |
324 | skb_dst_set(skb, &rt->dst); |
325 | ||
326 | /* strip the ethernet header added for pass through VRF device */ | |
327 | __skb_pull(skb, skb_network_offset(skb)); | |
193125db DA |
328 | |
329 | if (!ip4h->saddr) { | |
330 | ip4h->saddr = inet_select_addr(skb_dst(skb)->dev, 0, | |
331 | RT_SCOPE_LINK); | |
332 | } | |
333 | ||
ebfc102c | 334 | ret = vrf_ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb); |
193125db DA |
335 | if (unlikely(net_xmit_eval(ret))) |
336 | vrf_dev->stats.tx_errors++; | |
337 | else | |
338 | ret = NET_XMIT_SUCCESS; | |
339 | ||
340 | out: | |
341 | return ret; | |
342 | err: | |
57b8efa1 | 343 | vrf_tx_error(vrf_dev, skb); |
193125db DA |
344 | goto out; |
345 | } | |
346 | ||
347 | static netdev_tx_t is_ip_tx_frame(struct sk_buff *skb, struct net_device *dev) | |
348 | { | |
349 | switch (skb->protocol) { | |
350 | case htons(ETH_P_IP): | |
351 | return vrf_process_v4_outbound(skb, dev); | |
352 | case htons(ETH_P_IPV6): | |
353 | return vrf_process_v6_outbound(skb, dev); | |
354 | default: | |
57b8efa1 | 355 | vrf_tx_error(dev, skb); |
193125db DA |
356 | return NET_XMIT_DROP; |
357 | } | |
358 | } | |
359 | ||
360 | static netdev_tx_t vrf_xmit(struct sk_buff *skb, struct net_device *dev) | |
361 | { | |
f7887d40 | 362 | int len = skb->len; |
193125db DA |
363 | netdev_tx_t ret = is_ip_tx_frame(skb, dev); |
364 | ||
365 | if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { | |
366 | struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats); | |
367 | ||
368 | u64_stats_update_begin(&dstats->syncp); | |
369 | dstats->tx_pkts++; | |
f7887d40 | 370 | dstats->tx_bytes += len; |
193125db DA |
371 | u64_stats_update_end(&dstats->syncp); |
372 | } else { | |
373 | this_cpu_inc(dev->dstats->tx_drps); | |
374 | } | |
375 | ||
376 | return ret; | |
377 | } | |
378 | ||
dcdd43c4 DA |
379 | static int vrf_finish_direct(struct net *net, struct sock *sk, |
380 | struct sk_buff *skb) | |
381 | { | |
382 | struct net_device *vrf_dev = skb->dev; | |
383 | ||
384 | if (!list_empty(&vrf_dev->ptype_all) && | |
385 | likely(skb_headroom(skb) >= ETH_HLEN)) { | |
d58ff351 | 386 | struct ethhdr *eth = skb_push(skb, ETH_HLEN); |
dcdd43c4 DA |
387 | |
388 | ether_addr_copy(eth->h_source, vrf_dev->dev_addr); | |
389 | eth_zero_addr(eth->h_dest); | |
390 | eth->h_proto = skb->protocol; | |
391 | ||
392 | rcu_read_lock_bh(); | |
393 | dev_queue_xmit_nit(skb, vrf_dev); | |
394 | rcu_read_unlock_bh(); | |
395 | ||
396 | skb_pull(skb, ETH_HLEN); | |
397 | } | |
398 | ||
399 | return 1; | |
400 | } | |
401 | ||
35402e31 | 402 | #if IS_ENABLED(CONFIG_IPV6) |
35402e31 DA |
403 | /* modelled after ip6_finish_output2 */ |
404 | static int vrf_finish_output6(struct net *net, struct sock *sk, | |
405 | struct sk_buff *skb) | |
406 | { | |
407 | struct dst_entry *dst = skb_dst(skb); | |
408 | struct net_device *dev = dst->dev; | |
409 | struct neighbour *neigh; | |
410 | struct in6_addr *nexthop; | |
411 | int ret; | |
412 | ||
eb63ecc1 DA |
413 | nf_reset(skb); |
414 | ||
35402e31 DA |
415 | skb->protocol = htons(ETH_P_IPV6); |
416 | skb->dev = dev; | |
417 | ||
418 | rcu_read_lock_bh(); | |
419 | nexthop = rt6_nexthop((struct rt6_info *)dst, &ipv6_hdr(skb)->daddr); | |
420 | neigh = __ipv6_neigh_lookup_noref(dst->dev, nexthop); | |
421 | if (unlikely(!neigh)) | |
422 | neigh = __neigh_create(&nd_tbl, nexthop, dst->dev, false); | |
423 | if (!IS_ERR(neigh)) { | |
4ff06203 | 424 | sock_confirm_neigh(skb, neigh); |
c16ec185 | 425 | ret = neigh_output(neigh, skb); |
35402e31 DA |
426 | rcu_read_unlock_bh(); |
427 | return ret; | |
428 | } | |
429 | rcu_read_unlock_bh(); | |
430 | ||
431 | IP6_INC_STATS(dev_net(dst->dev), | |
432 | ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES); | |
433 | kfree_skb(skb); | |
434 | return -EINVAL; | |
435 | } | |
436 | ||
437 | /* modelled after ip6_output */ | |
438 | static int vrf_output6(struct net *net, struct sock *sk, struct sk_buff *skb) | |
439 | { | |
440 | return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING, | |
441 | net, sk, skb, NULL, skb_dst(skb)->dev, | |
442 | vrf_finish_output6, | |
443 | !(IP6CB(skb)->flags & IP6SKB_REROUTED)); | |
444 | } | |
445 | ||
4c1feac5 DA |
446 | /* set dst on skb to send packet to us via dev_xmit path. Allows |
447 | * packet to go through device based features such as qdisc, netfilter | |
448 | * hooks and packet sockets with skb->dev set to vrf device. | |
449 | */ | |
a9ec54d1 DA |
450 | static struct sk_buff *vrf_ip6_out_redirect(struct net_device *vrf_dev, |
451 | struct sk_buff *skb) | |
4c1feac5 DA |
452 | { |
453 | struct net_vrf *vrf = netdev_priv(vrf_dev); | |
454 | struct dst_entry *dst = NULL; | |
455 | struct rt6_info *rt6; | |
456 | ||
4c1feac5 DA |
457 | rcu_read_lock(); |
458 | ||
459 | rt6 = rcu_dereference(vrf->rt6); | |
460 | if (likely(rt6)) { | |
461 | dst = &rt6->dst; | |
462 | dst_hold(dst); | |
463 | } | |
464 | ||
465 | rcu_read_unlock(); | |
466 | ||
467 | if (unlikely(!dst)) { | |
468 | vrf_tx_error(vrf_dev, skb); | |
469 | return NULL; | |
470 | } | |
471 | ||
472 | skb_dst_drop(skb); | |
473 | skb_dst_set(skb, dst); | |
474 | ||
475 | return skb; | |
476 | } | |
477 | ||
a9ec54d1 DA |
478 | static int vrf_output6_direct(struct net *net, struct sock *sk, |
479 | struct sk_buff *skb) | |
480 | { | |
481 | skb->protocol = htons(ETH_P_IPV6); | |
482 | ||
483 | return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING, | |
484 | net, sk, skb, NULL, skb->dev, | |
485 | vrf_finish_direct, | |
486 | !(IPCB(skb)->flags & IPSKB_REROUTED)); | |
487 | } | |
488 | ||
489 | static struct sk_buff *vrf_ip6_out_direct(struct net_device *vrf_dev, | |
490 | struct sock *sk, | |
491 | struct sk_buff *skb) | |
492 | { | |
493 | struct net *net = dev_net(vrf_dev); | |
494 | int err; | |
495 | ||
496 | skb->dev = vrf_dev; | |
497 | ||
498 | err = nf_hook(NFPROTO_IPV6, NF_INET_LOCAL_OUT, net, sk, | |
499 | skb, NULL, vrf_dev, vrf_output6_direct); | |
500 | ||
501 | if (likely(err == 1)) | |
502 | err = vrf_output6_direct(net, sk, skb); | |
503 | ||
504 | /* reset skb device */ | |
505 | if (likely(err == 1)) | |
506 | nf_reset(skb); | |
507 | else | |
508 | skb = NULL; | |
509 | ||
510 | return skb; | |
511 | } | |
512 | ||
513 | static struct sk_buff *vrf_ip6_out(struct net_device *vrf_dev, | |
514 | struct sock *sk, | |
515 | struct sk_buff *skb) | |
516 | { | |
517 | /* don't divert link scope packets */ | |
518 | if (rt6_need_strict(&ipv6_hdr(skb)->daddr)) | |
519 | return skb; | |
520 | ||
521 | if (qdisc_tx_is_default(vrf_dev)) | |
522 | return vrf_ip6_out_direct(vrf_dev, sk, skb); | |
523 | ||
524 | return vrf_ip6_out_redirect(vrf_dev, skb); | |
525 | } | |
526 | ||
b0e95ccd | 527 | /* holding rtnl */ |
810e530b | 528 | static void vrf_rt6_release(struct net_device *dev, struct net_vrf *vrf) |
35402e31 | 529 | { |
b0e95ccd | 530 | struct rt6_info *rt6 = rtnl_dereference(vrf->rt6); |
b4869aa2 | 531 | struct rt6_info *rt6_local = rtnl_dereference(vrf->rt6_local); |
810e530b DA |
532 | struct net *net = dev_net(dev); |
533 | struct dst_entry *dst; | |
b0e95ccd | 534 | |
b4869aa2 DA |
535 | RCU_INIT_POINTER(vrf->rt6, NULL); |
536 | RCU_INIT_POINTER(vrf->rt6_local, NULL); | |
537 | synchronize_rcu(); | |
b0e95ccd | 538 | |
810e530b DA |
539 | /* move dev in dst's to loopback so this VRF device can be deleted |
540 | * - based on dst_ifdown | |
541 | */ | |
542 | if (rt6) { | |
543 | dst = &rt6->dst; | |
544 | dev_put(dst->dev); | |
545 | dst->dev = net->loopback_dev; | |
546 | dev_hold(dst->dev); | |
547 | dst_release(dst); | |
548 | } | |
b4869aa2 DA |
549 | |
550 | if (rt6_local) { | |
3dc857f0 | 551 | if (rt6_local->rt6i_idev) { |
b4869aa2 | 552 | in6_dev_put(rt6_local->rt6i_idev); |
3dc857f0 DA |
553 | rt6_local->rt6i_idev = NULL; |
554 | } | |
b4869aa2 | 555 | |
810e530b DA |
556 | dst = &rt6_local->dst; |
557 | dev_put(dst->dev); | |
558 | dst->dev = net->loopback_dev; | |
559 | dev_hold(dst->dev); | |
560 | dst_release(dst); | |
b4869aa2 | 561 | } |
35402e31 DA |
562 | } |
563 | ||
564 | static int vrf_rt6_create(struct net_device *dev) | |
565 | { | |
a4c2fd7f | 566 | int flags = DST_HOST | DST_NOPOLICY | DST_NOXFRM; |
35402e31 | 567 | struct net_vrf *vrf = netdev_priv(dev); |
9ab179d8 | 568 | struct net *net = dev_net(dev); |
b3b4663c | 569 | struct fib6_table *rt6i_table; |
b4869aa2 | 570 | struct rt6_info *rt6, *rt6_local; |
35402e31 DA |
571 | int rc = -ENOMEM; |
572 | ||
e4348637 DA |
573 | /* IPv6 can be CONFIG enabled and then disabled runtime */ |
574 | if (!ipv6_mod_enabled()) | |
575 | return 0; | |
576 | ||
b3b4663c DA |
577 | rt6i_table = fib6_new_table(net, vrf->tb_id); |
578 | if (!rt6i_table) | |
579 | goto out; | |
580 | ||
b4869aa2 DA |
581 | /* create a dst for routing packets out a VRF device */ |
582 | rt6 = ip6_dst_alloc(net, dev, flags); | |
35402e31 DA |
583 | if (!rt6) |
584 | goto out; | |
585 | ||
b3b4663c DA |
586 | rt6->rt6i_table = rt6i_table; |
587 | rt6->dst.output = vrf_output6; | |
b4869aa2 DA |
588 | |
589 | /* create a dst for local routing - packets sent locally | |
590 | * to local address via the VRF device as a loopback | |
591 | */ | |
592 | rt6_local = ip6_dst_alloc(net, dev, flags); | |
593 | if (!rt6_local) { | |
594 | dst_release(&rt6->dst); | |
595 | goto out; | |
596 | } | |
597 | ||
b4869aa2 DA |
598 | rt6_local->rt6i_idev = in6_dev_get(dev); |
599 | rt6_local->rt6i_flags = RTF_UP | RTF_NONEXTHOP | RTF_LOCAL; | |
600 | rt6_local->rt6i_table = rt6i_table; | |
601 | rt6_local->dst.input = ip6_input; | |
602 | ||
b0e95ccd | 603 | rcu_assign_pointer(vrf->rt6, rt6); |
b4869aa2 | 604 | rcu_assign_pointer(vrf->rt6_local, rt6_local); |
b0e95ccd | 605 | |
35402e31 DA |
606 | rc = 0; |
607 | out: | |
608 | return rc; | |
609 | } | |
610 | #else | |
4c1feac5 DA |
611 | static struct sk_buff *vrf_ip6_out(struct net_device *vrf_dev, |
612 | struct sock *sk, | |
613 | struct sk_buff *skb) | |
614 | { | |
615 | return skb; | |
616 | } | |
617 | ||
810e530b | 618 | static void vrf_rt6_release(struct net_device *dev, struct net_vrf *vrf) |
35402e31 DA |
619 | { |
620 | } | |
621 | ||
622 | static int vrf_rt6_create(struct net_device *dev) | |
623 | { | |
624 | return 0; | |
625 | } | |
626 | #endif | |
627 | ||
8f58336d | 628 | /* modelled after ip_finish_output2 */ |
0c4b51f0 | 629 | static int vrf_finish_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
193125db | 630 | { |
8f58336d DA |
631 | struct dst_entry *dst = skb_dst(skb); |
632 | struct rtable *rt = (struct rtable *)dst; | |
633 | struct net_device *dev = dst->dev; | |
634 | unsigned int hh_len = LL_RESERVED_SPACE(dev); | |
635 | struct neighbour *neigh; | |
636 | u32 nexthop; | |
637 | int ret = -EINVAL; | |
638 | ||
eb63ecc1 DA |
639 | nf_reset(skb); |
640 | ||
8f58336d DA |
641 | /* Be paranoid, rather than too clever. */ |
642 | if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) { | |
643 | struct sk_buff *skb2; | |
644 | ||
645 | skb2 = skb_realloc_headroom(skb, LL_RESERVED_SPACE(dev)); | |
646 | if (!skb2) { | |
647 | ret = -ENOMEM; | |
648 | goto err; | |
649 | } | |
650 | if (skb->sk) | |
651 | skb_set_owner_w(skb2, skb->sk); | |
652 | ||
653 | consume_skb(skb); | |
654 | skb = skb2; | |
655 | } | |
656 | ||
657 | rcu_read_lock_bh(); | |
658 | ||
659 | nexthop = (__force u32)rt_nexthop(rt, ip_hdr(skb)->daddr); | |
660 | neigh = __ipv4_neigh_lookup_noref(dev, nexthop); | |
661 | if (unlikely(!neigh)) | |
662 | neigh = __neigh_create(&arp_tbl, &nexthop, dev, false); | |
4ff06203 JA |
663 | if (!IS_ERR(neigh)) { |
664 | sock_confirm_neigh(skb, neigh); | |
c16ec185 | 665 | ret = neigh_output(neigh, skb); |
4ff06203 | 666 | } |
8f58336d DA |
667 | |
668 | rcu_read_unlock_bh(); | |
669 | err: | |
670 | if (unlikely(ret < 0)) | |
671 | vrf_tx_error(skb->dev, skb); | |
672 | return ret; | |
193125db DA |
673 | } |
674 | ||
ede2059d | 675 | static int vrf_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
193125db DA |
676 | { |
677 | struct net_device *dev = skb_dst(skb)->dev; | |
678 | ||
29a26a56 | 679 | IP_UPD_PO_STATS(net, IPSTATS_MIB_OUT, skb->len); |
193125db DA |
680 | |
681 | skb->dev = dev; | |
682 | skb->protocol = htons(ETH_P_IP); | |
683 | ||
29a26a56 EB |
684 | return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING, |
685 | net, sk, skb, NULL, dev, | |
8f58336d | 686 | vrf_finish_output, |
193125db DA |
687 | !(IPCB(skb)->flags & IPSKB_REROUTED)); |
688 | } | |
689 | ||
ebfc102c DA |
690 | /* set dst on skb to send packet to us via dev_xmit path. Allows |
691 | * packet to go through device based features such as qdisc, netfilter | |
692 | * hooks and packet sockets with skb->dev set to vrf device. | |
693 | */ | |
dcdd43c4 DA |
694 | static struct sk_buff *vrf_ip_out_redirect(struct net_device *vrf_dev, |
695 | struct sk_buff *skb) | |
ebfc102c DA |
696 | { |
697 | struct net_vrf *vrf = netdev_priv(vrf_dev); | |
698 | struct dst_entry *dst = NULL; | |
699 | struct rtable *rth; | |
700 | ||
701 | rcu_read_lock(); | |
702 | ||
703 | rth = rcu_dereference(vrf->rth); | |
704 | if (likely(rth)) { | |
705 | dst = &rth->dst; | |
706 | dst_hold(dst); | |
707 | } | |
708 | ||
709 | rcu_read_unlock(); | |
710 | ||
711 | if (unlikely(!dst)) { | |
712 | vrf_tx_error(vrf_dev, skb); | |
713 | return NULL; | |
714 | } | |
715 | ||
716 | skb_dst_drop(skb); | |
717 | skb_dst_set(skb, dst); | |
718 | ||
719 | return skb; | |
720 | } | |
721 | ||
dcdd43c4 DA |
722 | static int vrf_output_direct(struct net *net, struct sock *sk, |
723 | struct sk_buff *skb) | |
724 | { | |
725 | skb->protocol = htons(ETH_P_IP); | |
726 | ||
727 | return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING, | |
728 | net, sk, skb, NULL, skb->dev, | |
729 | vrf_finish_direct, | |
730 | !(IPCB(skb)->flags & IPSKB_REROUTED)); | |
731 | } | |
732 | ||
733 | static struct sk_buff *vrf_ip_out_direct(struct net_device *vrf_dev, | |
734 | struct sock *sk, | |
735 | struct sk_buff *skb) | |
736 | { | |
737 | struct net *net = dev_net(vrf_dev); | |
738 | int err; | |
739 | ||
740 | skb->dev = vrf_dev; | |
741 | ||
742 | err = nf_hook(NFPROTO_IPV4, NF_INET_LOCAL_OUT, net, sk, | |
743 | skb, NULL, vrf_dev, vrf_output_direct); | |
744 | ||
745 | if (likely(err == 1)) | |
746 | err = vrf_output_direct(net, sk, skb); | |
747 | ||
748 | /* reset skb device */ | |
749 | if (likely(err == 1)) | |
750 | nf_reset(skb); | |
751 | else | |
752 | skb = NULL; | |
753 | ||
754 | return skb; | |
755 | } | |
756 | ||
757 | static struct sk_buff *vrf_ip_out(struct net_device *vrf_dev, | |
758 | struct sock *sk, | |
759 | struct sk_buff *skb) | |
760 | { | |
761 | /* don't divert multicast */ | |
762 | if (ipv4_is_multicast(ip_hdr(skb)->daddr)) | |
763 | return skb; | |
764 | ||
765 | if (qdisc_tx_is_default(vrf_dev)) | |
766 | return vrf_ip_out_direct(vrf_dev, sk, skb); | |
767 | ||
768 | return vrf_ip_out_redirect(vrf_dev, skb); | |
769 | } | |
770 | ||
ebfc102c DA |
771 | /* called with rcu lock held */ |
772 | static struct sk_buff *vrf_l3_out(struct net_device *vrf_dev, | |
773 | struct sock *sk, | |
774 | struct sk_buff *skb, | |
775 | u16 proto) | |
776 | { | |
777 | switch (proto) { | |
778 | case AF_INET: | |
779 | return vrf_ip_out(vrf_dev, sk, skb); | |
4c1feac5 DA |
780 | case AF_INET6: |
781 | return vrf_ip6_out(vrf_dev, sk, skb); | |
ebfc102c DA |
782 | } |
783 | ||
784 | return skb; | |
785 | } | |
786 | ||
b0e95ccd | 787 | /* holding rtnl */ |
810e530b | 788 | static void vrf_rtable_release(struct net_device *dev, struct net_vrf *vrf) |
193125db | 789 | { |
b0e95ccd | 790 | struct rtable *rth = rtnl_dereference(vrf->rth); |
afe80a49 | 791 | struct rtable *rth_local = rtnl_dereference(vrf->rth_local); |
810e530b DA |
792 | struct net *net = dev_net(dev); |
793 | struct dst_entry *dst; | |
b0e95ccd | 794 | |
afe80a49 DA |
795 | RCU_INIT_POINTER(vrf->rth, NULL); |
796 | RCU_INIT_POINTER(vrf->rth_local, NULL); | |
797 | synchronize_rcu(); | |
193125db | 798 | |
810e530b DA |
799 | /* move dev in dst's to loopback so this VRF device can be deleted |
800 | * - based on dst_ifdown | |
801 | */ | |
802 | if (rth) { | |
803 | dst = &rth->dst; | |
804 | dev_put(dst->dev); | |
805 | dst->dev = net->loopback_dev; | |
806 | dev_hold(dst->dev); | |
807 | dst_release(dst); | |
808 | } | |
afe80a49 | 809 | |
810e530b DA |
810 | if (rth_local) { |
811 | dst = &rth_local->dst; | |
812 | dev_put(dst->dev); | |
813 | dst->dev = net->loopback_dev; | |
814 | dev_hold(dst->dev); | |
815 | dst_release(dst); | |
816 | } | |
193125db DA |
817 | } |
818 | ||
b0e95ccd | 819 | static int vrf_rtable_create(struct net_device *dev) |
193125db | 820 | { |
b7503e0c | 821 | struct net_vrf *vrf = netdev_priv(dev); |
afe80a49 | 822 | struct rtable *rth, *rth_local; |
193125db | 823 | |
b3b4663c | 824 | if (!fib_new_table(dev_net(dev), vrf->tb_id)) |
b0e95ccd | 825 | return -ENOMEM; |
b3b4663c | 826 | |
afe80a49 | 827 | /* create a dst for routing packets out through a VRF device */ |
9ab179d8 | 828 | rth = rt_dst_alloc(dev, 0, RTN_UNICAST, 1, 1, 0); |
b0e95ccd DA |
829 | if (!rth) |
830 | return -ENOMEM; | |
193125db | 831 | |
afe80a49 DA |
832 | /* create a dst for local ingress routing - packets sent locally |
833 | * to local address via the VRF device as a loopback | |
834 | */ | |
835 | rth_local = rt_dst_alloc(dev, RTCF_LOCAL, RTN_LOCAL, 1, 1, 0); | |
836 | if (!rth_local) { | |
837 | dst_release(&rth->dst); | |
838 | return -ENOMEM; | |
839 | } | |
840 | ||
b0e95ccd DA |
841 | rth->dst.output = vrf_output; |
842 | rth->rt_table_id = vrf->tb_id; | |
843 | ||
afe80a49 DA |
844 | rth_local->rt_table_id = vrf->tb_id; |
845 | ||
b0e95ccd | 846 | rcu_assign_pointer(vrf->rth, rth); |
afe80a49 | 847 | rcu_assign_pointer(vrf->rth_local, rth_local); |
b0e95ccd DA |
848 | |
849 | return 0; | |
193125db DA |
850 | } |
851 | ||
852 | /**************************** device handling ********************/ | |
853 | ||
854 | /* cycle interface to flush neighbor cache and move routes across tables */ | |
855 | static void cycle_netdev(struct net_device *dev) | |
856 | { | |
857 | unsigned int flags = dev->flags; | |
858 | int ret; | |
859 | ||
860 | if (!netif_running(dev)) | |
861 | return; | |
862 | ||
863 | ret = dev_change_flags(dev, flags & ~IFF_UP); | |
864 | if (ret >= 0) | |
865 | ret = dev_change_flags(dev, flags); | |
866 | ||
867 | if (ret < 0) { | |
868 | netdev_err(dev, | |
869 | "Failed to cycle device %s; route tables might be wrong!\n", | |
870 | dev->name); | |
871 | } | |
872 | } | |
873 | ||
193125db DA |
874 | static int do_vrf_add_slave(struct net_device *dev, struct net_device *port_dev) |
875 | { | |
bad53162 | 876 | int ret; |
193125db | 877 | |
26d31ac1 DA |
878 | /* do not allow loopback device to be enslaved to a VRF. |
879 | * The vrf device acts as the loopback for the vrf. | |
880 | */ | |
881 | if (port_dev == dev_net(dev)->loopback_dev) | |
882 | return -EOPNOTSUPP; | |
883 | ||
fdeea7be | 884 | port_dev->priv_flags |= IFF_L3MDEV_SLAVE; |
29bf24af | 885 | ret = netdev_master_upper_dev_link(port_dev, dev, NULL, NULL); |
193125db | 886 | if (ret < 0) |
fdeea7be | 887 | goto err; |
193125db | 888 | |
193125db DA |
889 | cycle_netdev(port_dev); |
890 | ||
891 | return 0; | |
fdeea7be IS |
892 | |
893 | err: | |
894 | port_dev->priv_flags &= ~IFF_L3MDEV_SLAVE; | |
895 | return ret; | |
193125db DA |
896 | } |
897 | ||
898 | static int vrf_add_slave(struct net_device *dev, struct net_device *port_dev) | |
899 | { | |
fee6d4c7 | 900 | if (netif_is_l3_master(port_dev) || netif_is_l3_slave(port_dev)) |
193125db DA |
901 | return -EINVAL; |
902 | ||
903 | return do_vrf_add_slave(dev, port_dev); | |
904 | } | |
905 | ||
906 | /* inverse of do_vrf_add_slave */ | |
907 | static int do_vrf_del_slave(struct net_device *dev, struct net_device *port_dev) | |
908 | { | |
193125db | 909 | netdev_upper_dev_unlink(port_dev, dev); |
fee6d4c7 | 910 | port_dev->priv_flags &= ~IFF_L3MDEV_SLAVE; |
193125db | 911 | |
193125db DA |
912 | cycle_netdev(port_dev); |
913 | ||
193125db DA |
914 | return 0; |
915 | } | |
916 | ||
917 | static int vrf_del_slave(struct net_device *dev, struct net_device *port_dev) | |
918 | { | |
193125db DA |
919 | return do_vrf_del_slave(dev, port_dev); |
920 | } | |
921 | ||
922 | static void vrf_dev_uninit(struct net_device *dev) | |
923 | { | |
924 | struct net_vrf *vrf = netdev_priv(dev); | |
193125db | 925 | |
810e530b DA |
926 | vrf_rtable_release(dev, vrf); |
927 | vrf_rt6_release(dev, vrf); | |
193125db | 928 | |
3a4a27d3 | 929 | free_percpu(dev->dstats); |
193125db DA |
930 | dev->dstats = NULL; |
931 | } | |
932 | ||
933 | static int vrf_dev_init(struct net_device *dev) | |
934 | { | |
935 | struct net_vrf *vrf = netdev_priv(dev); | |
936 | ||
193125db DA |
937 | dev->dstats = netdev_alloc_pcpu_stats(struct pcpu_dstats); |
938 | if (!dev->dstats) | |
939 | goto out_nomem; | |
940 | ||
941 | /* create the default dst which points back to us */ | |
b0e95ccd | 942 | if (vrf_rtable_create(dev) != 0) |
193125db DA |
943 | goto out_stats; |
944 | ||
35402e31 DA |
945 | if (vrf_rt6_create(dev) != 0) |
946 | goto out_rth; | |
947 | ||
193125db DA |
948 | dev->flags = IFF_MASTER | IFF_NOARP; |
949 | ||
b87ab6b8 DA |
950 | /* MTU is irrelevant for VRF device; set to 64k similar to lo */ |
951 | dev->mtu = 64 * 1024; | |
952 | ||
953 | /* similarly, oper state is irrelevant; set to up to avoid confusion */ | |
954 | dev->operstate = IF_OPER_UP; | |
78e7a2ae | 955 | netdev_lockdep_set_classes(dev); |
193125db DA |
956 | return 0; |
957 | ||
35402e31 | 958 | out_rth: |
810e530b | 959 | vrf_rtable_release(dev, vrf); |
193125db DA |
960 | out_stats: |
961 | free_percpu(dev->dstats); | |
962 | dev->dstats = NULL; | |
963 | out_nomem: | |
964 | return -ENOMEM; | |
965 | } | |
966 | ||
967 | static const struct net_device_ops vrf_netdev_ops = { | |
968 | .ndo_init = vrf_dev_init, | |
969 | .ndo_uninit = vrf_dev_uninit, | |
970 | .ndo_start_xmit = vrf_xmit, | |
971 | .ndo_get_stats64 = vrf_get_stats64, | |
972 | .ndo_add_slave = vrf_add_slave, | |
973 | .ndo_del_slave = vrf_del_slave, | |
974 | }; | |
975 | ||
ee15ee5d DA |
976 | static u32 vrf_fib_table(const struct net_device *dev) |
977 | { | |
978 | struct net_vrf *vrf = netdev_priv(dev); | |
979 | ||
980 | return vrf->tb_id; | |
981 | } | |
982 | ||
73e20b76 DA |
983 | static int vrf_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb) |
984 | { | |
1a4a5bf5 | 985 | kfree_skb(skb); |
73e20b76 DA |
986 | return 0; |
987 | } | |
988 | ||
989 | static struct sk_buff *vrf_rcv_nfhook(u8 pf, unsigned int hook, | |
990 | struct sk_buff *skb, | |
991 | struct net_device *dev) | |
992 | { | |
993 | struct net *net = dev_net(dev); | |
994 | ||
1a4a5bf5 | 995 | if (nf_hook(pf, hook, net, NULL, skb, dev, NULL, vrf_rcv_finish) != 1) |
73e20b76 DA |
996 | skb = NULL; /* kfree_skb(skb) handled by nf code */ |
997 | ||
998 | return skb; | |
999 | } | |
1000 | ||
74b20582 DA |
1001 | #if IS_ENABLED(CONFIG_IPV6) |
1002 | /* neighbor handling is done with actual device; do not want | |
1003 | * to flip skb->dev for those ndisc packets. This really fails | |
1004 | * for multiple next protocols (e.g., NEXTHDR_HOP). But it is | |
1005 | * a start. | |
1006 | */ | |
1007 | static bool ipv6_ndisc_frame(const struct sk_buff *skb) | |
1008 | { | |
1009 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
1010 | bool rc = false; | |
1011 | ||
1012 | if (iph->nexthdr == NEXTHDR_ICMP) { | |
1013 | const struct icmp6hdr *icmph; | |
1014 | struct icmp6hdr _icmph; | |
1015 | ||
1016 | icmph = skb_header_pointer(skb, sizeof(*iph), | |
1017 | sizeof(_icmph), &_icmph); | |
1018 | if (!icmph) | |
1019 | goto out; | |
1020 | ||
1021 | switch (icmph->icmp6_type) { | |
1022 | case NDISC_ROUTER_SOLICITATION: | |
1023 | case NDISC_ROUTER_ADVERTISEMENT: | |
1024 | case NDISC_NEIGHBOUR_SOLICITATION: | |
1025 | case NDISC_NEIGHBOUR_ADVERTISEMENT: | |
1026 | case NDISC_REDIRECT: | |
1027 | rc = true; | |
1028 | break; | |
1029 | } | |
1030 | } | |
1031 | ||
1032 | out: | |
1033 | return rc; | |
1034 | } | |
1035 | ||
9ff74384 DA |
1036 | static struct rt6_info *vrf_ip6_route_lookup(struct net *net, |
1037 | const struct net_device *dev, | |
1038 | struct flowi6 *fl6, | |
1039 | int ifindex, | |
1040 | int flags) | |
1041 | { | |
1042 | struct net_vrf *vrf = netdev_priv(dev); | |
1043 | struct fib6_table *table = NULL; | |
1044 | struct rt6_info *rt6; | |
1045 | ||
1046 | rcu_read_lock(); | |
1047 | ||
1048 | /* fib6_table does not have a refcnt and can not be freed */ | |
1049 | rt6 = rcu_dereference(vrf->rt6); | |
1050 | if (likely(rt6)) | |
1051 | table = rt6->rt6i_table; | |
1052 | ||
1053 | rcu_read_unlock(); | |
1054 | ||
1055 | if (!table) | |
1056 | return NULL; | |
1057 | ||
1058 | return ip6_pol_route(net, table, ifindex, fl6, flags); | |
1059 | } | |
1060 | ||
1061 | static void vrf_ip6_input_dst(struct sk_buff *skb, struct net_device *vrf_dev, | |
1062 | int ifindex) | |
1063 | { | |
1064 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
1065 | struct flowi6 fl6 = { | |
1066 | .daddr = iph->daddr, | |
1067 | .saddr = iph->saddr, | |
1068 | .flowlabel = ip6_flowinfo(iph), | |
1069 | .flowi6_mark = skb->mark, | |
1070 | .flowi6_proto = iph->nexthdr, | |
1071 | .flowi6_iif = ifindex, | |
1072 | }; | |
1073 | struct net *net = dev_net(vrf_dev); | |
1074 | struct rt6_info *rt6; | |
1075 | ||
1076 | rt6 = vrf_ip6_route_lookup(net, vrf_dev, &fl6, ifindex, | |
1077 | RT6_LOOKUP_F_HAS_SADDR | RT6_LOOKUP_F_IFACE); | |
1078 | if (unlikely(!rt6)) | |
1079 | return; | |
1080 | ||
1081 | if (unlikely(&rt6->dst == &net->ipv6.ip6_null_entry->dst)) | |
1082 | return; | |
1083 | ||
1084 | skb_dst_set(skb, &rt6->dst); | |
1085 | } | |
1086 | ||
74b20582 DA |
1087 | static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev, |
1088 | struct sk_buff *skb) | |
1089 | { | |
9ff74384 DA |
1090 | int orig_iif = skb->skb_iif; |
1091 | bool need_strict; | |
1092 | ||
b4869aa2 DA |
1093 | /* loopback traffic; do not push through packet taps again. |
1094 | * Reset pkt_type for upper layers to process skb | |
1095 | */ | |
1096 | if (skb->pkt_type == PACKET_LOOPBACK) { | |
1097 | skb->dev = vrf_dev; | |
1098 | skb->skb_iif = vrf_dev->ifindex; | |
a04a480d | 1099 | IP6CB(skb)->flags |= IP6SKB_L3SLAVE; |
b4869aa2 DA |
1100 | skb->pkt_type = PACKET_HOST; |
1101 | goto out; | |
1102 | } | |
1103 | ||
9ff74384 DA |
1104 | /* if packet is NDISC or addressed to multicast or link-local |
1105 | * then keep the ingress interface | |
1106 | */ | |
1107 | need_strict = rt6_need_strict(&ipv6_hdr(skb)->daddr); | |
1108 | if (!ipv6_ndisc_frame(skb) && !need_strict) { | |
926d93a3 | 1109 | vrf_rx_stats(vrf_dev, skb->len); |
74b20582 DA |
1110 | skb->dev = vrf_dev; |
1111 | skb->skb_iif = vrf_dev->ifindex; | |
1112 | ||
a9ec54d1 DA |
1113 | if (!list_empty(&vrf_dev->ptype_all)) { |
1114 | skb_push(skb, skb->mac_len); | |
1115 | dev_queue_xmit_nit(skb, vrf_dev); | |
1116 | skb_pull(skb, skb->mac_len); | |
1117 | } | |
74b20582 DA |
1118 | |
1119 | IP6CB(skb)->flags |= IP6SKB_L3SLAVE; | |
1120 | } | |
1121 | ||
9ff74384 DA |
1122 | if (need_strict) |
1123 | vrf_ip6_input_dst(skb, vrf_dev, orig_iif); | |
1124 | ||
73e20b76 | 1125 | skb = vrf_rcv_nfhook(NFPROTO_IPV6, NF_INET_PRE_ROUTING, skb, vrf_dev); |
b4869aa2 | 1126 | out: |
74b20582 DA |
1127 | return skb; |
1128 | } | |
1129 | ||
1130 | #else | |
1131 | static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev, | |
1132 | struct sk_buff *skb) | |
1133 | { | |
1134 | return skb; | |
1135 | } | |
1136 | #endif | |
1137 | ||
1138 | static struct sk_buff *vrf_ip_rcv(struct net_device *vrf_dev, | |
1139 | struct sk_buff *skb) | |
1140 | { | |
1141 | skb->dev = vrf_dev; | |
1142 | skb->skb_iif = vrf_dev->ifindex; | |
a04a480d | 1143 | IPCB(skb)->flags |= IPSKB_L3SLAVE; |
74b20582 | 1144 | |
e58e4159 DA |
1145 | if (ipv4_is_multicast(ip_hdr(skb)->daddr)) |
1146 | goto out; | |
1147 | ||
afe80a49 DA |
1148 | /* loopback traffic; do not push through packet taps again. |
1149 | * Reset pkt_type for upper layers to process skb | |
1150 | */ | |
1151 | if (skb->pkt_type == PACKET_LOOPBACK) { | |
1152 | skb->pkt_type = PACKET_HOST; | |
1153 | goto out; | |
1154 | } | |
1155 | ||
926d93a3 DA |
1156 | vrf_rx_stats(vrf_dev, skb->len); |
1157 | ||
dcdd43c4 DA |
1158 | if (!list_empty(&vrf_dev->ptype_all)) { |
1159 | skb_push(skb, skb->mac_len); | |
1160 | dev_queue_xmit_nit(skb, vrf_dev); | |
1161 | skb_pull(skb, skb->mac_len); | |
1162 | } | |
74b20582 | 1163 | |
73e20b76 | 1164 | skb = vrf_rcv_nfhook(NFPROTO_IPV4, NF_INET_PRE_ROUTING, skb, vrf_dev); |
afe80a49 | 1165 | out: |
74b20582 DA |
1166 | return skb; |
1167 | } | |
1168 | ||
1169 | /* called with rcu lock held */ | |
1170 | static struct sk_buff *vrf_l3_rcv(struct net_device *vrf_dev, | |
1171 | struct sk_buff *skb, | |
1172 | u16 proto) | |
1173 | { | |
1174 | switch (proto) { | |
1175 | case AF_INET: | |
1176 | return vrf_ip_rcv(vrf_dev, skb); | |
1177 | case AF_INET6: | |
1178 | return vrf_ip6_rcv(vrf_dev, skb); | |
1179 | } | |
1180 | ||
1181 | return skb; | |
1182 | } | |
1183 | ||
35402e31 | 1184 | #if IS_ENABLED(CONFIG_IPV6) |
4c1feac5 DA |
1185 | /* send to link-local or multicast address via interface enslaved to |
1186 | * VRF device. Force lookup to VRF table without changing flow struct | |
1187 | */ | |
1188 | static struct dst_entry *vrf_link_scope_lookup(const struct net_device *dev, | |
1189 | struct flowi6 *fl6) | |
35402e31 | 1190 | { |
9ff74384 | 1191 | struct net *net = dev_net(dev); |
4c1feac5 | 1192 | int flags = RT6_LOOKUP_F_IFACE; |
b0e95ccd | 1193 | struct dst_entry *dst = NULL; |
9ff74384 | 1194 | struct rt6_info *rt; |
35402e31 | 1195 | |
4c1feac5 DA |
1196 | /* VRF device does not have a link-local address and |
1197 | * sending packets to link-local or mcast addresses over | |
1198 | * a VRF device does not make sense | |
1199 | */ | |
1200 | if (fl6->flowi6_oif == dev->ifindex) { | |
1201 | dst = &net->ipv6.ip6_null_entry->dst; | |
1202 | dst_hold(dst); | |
1203 | return dst; | |
35402e31 DA |
1204 | } |
1205 | ||
4c1feac5 DA |
1206 | if (!ipv6_addr_any(&fl6->saddr)) |
1207 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
1208 | ||
1209 | rt = vrf_ip6_route_lookup(net, dev, fl6, fl6->flowi6_oif, flags); | |
1210 | if (rt) | |
1211 | dst = &rt->dst; | |
9ff74384 | 1212 | |
b0e95ccd | 1213 | return dst; |
35402e31 DA |
1214 | } |
1215 | #endif | |
1216 | ||
ee15ee5d DA |
1217 | static const struct l3mdev_ops vrf_l3mdev_ops = { |
1218 | .l3mdev_fib_table = vrf_fib_table, | |
74b20582 | 1219 | .l3mdev_l3_rcv = vrf_l3_rcv, |
ebfc102c | 1220 | .l3mdev_l3_out = vrf_l3_out, |
35402e31 | 1221 | #if IS_ENABLED(CONFIG_IPV6) |
4c1feac5 | 1222 | .l3mdev_link_scope_lookup = vrf_link_scope_lookup, |
35402e31 | 1223 | #endif |
ee15ee5d DA |
1224 | }; |
1225 | ||
193125db DA |
1226 | static void vrf_get_drvinfo(struct net_device *dev, |
1227 | struct ethtool_drvinfo *info) | |
1228 | { | |
1229 | strlcpy(info->driver, DRV_NAME, sizeof(info->driver)); | |
1230 | strlcpy(info->version, DRV_VERSION, sizeof(info->version)); | |
1231 | } | |
1232 | ||
1233 | static const struct ethtool_ops vrf_ethtool_ops = { | |
1234 | .get_drvinfo = vrf_get_drvinfo, | |
1235 | }; | |
1236 | ||
1aa6c4f6 DA |
1237 | static inline size_t vrf_fib_rule_nl_size(void) |
1238 | { | |
1239 | size_t sz; | |
1240 | ||
1241 | sz = NLMSG_ALIGN(sizeof(struct fib_rule_hdr)); | |
1242 | sz += nla_total_size(sizeof(u8)); /* FRA_L3MDEV */ | |
1243 | sz += nla_total_size(sizeof(u32)); /* FRA_PRIORITY */ | |
1244 | ||
1245 | return sz; | |
1246 | } | |
1247 | ||
1248 | static int vrf_fib_rule(const struct net_device *dev, __u8 family, bool add_it) | |
1249 | { | |
1250 | struct fib_rule_hdr *frh; | |
1251 | struct nlmsghdr *nlh; | |
1252 | struct sk_buff *skb; | |
1253 | int err; | |
1254 | ||
e4348637 DA |
1255 | if (family == AF_INET6 && !ipv6_mod_enabled()) |
1256 | return 0; | |
1257 | ||
1aa6c4f6 DA |
1258 | skb = nlmsg_new(vrf_fib_rule_nl_size(), GFP_KERNEL); |
1259 | if (!skb) | |
1260 | return -ENOMEM; | |
1261 | ||
1262 | nlh = nlmsg_put(skb, 0, 0, 0, sizeof(*frh), 0); | |
1263 | if (!nlh) | |
1264 | goto nla_put_failure; | |
1265 | ||
1266 | /* rule only needs to appear once */ | |
426c87ca | 1267 | nlh->nlmsg_flags |= NLM_F_EXCL; |
1aa6c4f6 DA |
1268 | |
1269 | frh = nlmsg_data(nlh); | |
1270 | memset(frh, 0, sizeof(*frh)); | |
1271 | frh->family = family; | |
1272 | frh->action = FR_ACT_TO_TBL; | |
1273 | ||
1274 | if (nla_put_u32(skb, FRA_L3MDEV, 1)) | |
1275 | goto nla_put_failure; | |
1276 | ||
1277 | if (nla_put_u32(skb, FRA_PRIORITY, FIB_RULE_PREF)) | |
1278 | goto nla_put_failure; | |
1279 | ||
1280 | nlmsg_end(skb, nlh); | |
1281 | ||
1282 | /* fib_nl_{new,del}rule handling looks for net from skb->sk */ | |
1283 | skb->sk = dev_net(dev)->rtnl; | |
1284 | if (add_it) { | |
c21ef3e3 | 1285 | err = fib_nl_newrule(skb, nlh, NULL); |
1aa6c4f6 DA |
1286 | if (err == -EEXIST) |
1287 | err = 0; | |
1288 | } else { | |
c21ef3e3 | 1289 | err = fib_nl_delrule(skb, nlh, NULL); |
1aa6c4f6 DA |
1290 | if (err == -ENOENT) |
1291 | err = 0; | |
1292 | } | |
1293 | nlmsg_free(skb); | |
1294 | ||
1295 | return err; | |
1296 | ||
1297 | nla_put_failure: | |
1298 | nlmsg_free(skb); | |
1299 | ||
1300 | return -EMSGSIZE; | |
1301 | } | |
1302 | ||
1303 | static int vrf_add_fib_rules(const struct net_device *dev) | |
1304 | { | |
1305 | int err; | |
1306 | ||
1307 | err = vrf_fib_rule(dev, AF_INET, true); | |
1308 | if (err < 0) | |
1309 | goto out_err; | |
1310 | ||
1311 | err = vrf_fib_rule(dev, AF_INET6, true); | |
1312 | if (err < 0) | |
1313 | goto ipv6_err; | |
1314 | ||
e58e4159 DA |
1315 | #if IS_ENABLED(CONFIG_IP_MROUTE_MULTIPLE_TABLES) |
1316 | err = vrf_fib_rule(dev, RTNL_FAMILY_IPMR, true); | |
1317 | if (err < 0) | |
1318 | goto ipmr_err; | |
1319 | #endif | |
1320 | ||
1aa6c4f6 DA |
1321 | return 0; |
1322 | ||
e58e4159 DA |
1323 | #if IS_ENABLED(CONFIG_IP_MROUTE_MULTIPLE_TABLES) |
1324 | ipmr_err: | |
1325 | vrf_fib_rule(dev, AF_INET6, false); | |
1326 | #endif | |
1327 | ||
1aa6c4f6 DA |
1328 | ipv6_err: |
1329 | vrf_fib_rule(dev, AF_INET, false); | |
1330 | ||
1331 | out_err: | |
1332 | netdev_err(dev, "Failed to add FIB rules.\n"); | |
1333 | return err; | |
1334 | } | |
1335 | ||
193125db DA |
1336 | static void vrf_setup(struct net_device *dev) |
1337 | { | |
1338 | ether_setup(dev); | |
1339 | ||
1340 | /* Initialize the device structure. */ | |
1341 | dev->netdev_ops = &vrf_netdev_ops; | |
ee15ee5d | 1342 | dev->l3mdev_ops = &vrf_l3mdev_ops; |
193125db | 1343 | dev->ethtool_ops = &vrf_ethtool_ops; |
cf124db5 | 1344 | dev->needs_free_netdev = true; |
193125db DA |
1345 | |
1346 | /* Fill in device structure with ethernet-generic values. */ | |
1347 | eth_hw_addr_random(dev); | |
1348 | ||
1349 | /* don't acquire vrf device's netif_tx_lock when transmitting */ | |
1350 | dev->features |= NETIF_F_LLTX; | |
1351 | ||
1352 | /* don't allow vrf devices to change network namespaces. */ | |
1353 | dev->features |= NETIF_F_NETNS_LOCAL; | |
7889681f DA |
1354 | |
1355 | /* does not make sense for a VLAN to be added to a vrf device */ | |
1356 | dev->features |= NETIF_F_VLAN_CHALLENGED; | |
1357 | ||
1358 | /* enable offload features */ | |
1359 | dev->features |= NETIF_F_GSO_SOFTWARE; | |
1360 | dev->features |= NETIF_F_RXCSUM | NETIF_F_HW_CSUM; | |
1361 | dev->features |= NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA; | |
1362 | ||
1363 | dev->hw_features = dev->features; | |
1364 | dev->hw_enc_features = dev->features; | |
1365 | ||
1366 | /* default to no qdisc; user can add if desired */ | |
1367 | dev->priv_flags |= IFF_NO_QUEUE; | |
193125db DA |
1368 | } |
1369 | ||
a8b8a889 MS |
1370 | static int vrf_validate(struct nlattr *tb[], struct nlattr *data[], |
1371 | struct netlink_ext_ack *extack) | |
193125db DA |
1372 | { |
1373 | if (tb[IFLA_ADDRESS]) { | |
1374 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) | |
1375 | return -EINVAL; | |
1376 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) | |
1377 | return -EADDRNOTAVAIL; | |
1378 | } | |
1379 | return 0; | |
1380 | } | |
1381 | ||
1382 | static void vrf_dellink(struct net_device *dev, struct list_head *head) | |
1383 | { | |
f630c38e NA |
1384 | struct net_device *port_dev; |
1385 | struct list_head *iter; | |
1386 | ||
1387 | netdev_for_each_lower_dev(dev, port_dev, iter) | |
1388 | vrf_del_slave(dev, port_dev); | |
1389 | ||
193125db DA |
1390 | unregister_netdevice_queue(dev, head); |
1391 | } | |
1392 | ||
1393 | static int vrf_newlink(struct net *src_net, struct net_device *dev, | |
7a3f4a18 MS |
1394 | struct nlattr *tb[], struct nlattr *data[], |
1395 | struct netlink_ext_ack *extack) | |
193125db DA |
1396 | { |
1397 | struct net_vrf *vrf = netdev_priv(dev); | |
097d3c95 DA |
1398 | bool *add_fib_rules; |
1399 | struct net *net; | |
1aa6c4f6 | 1400 | int err; |
193125db DA |
1401 | |
1402 | if (!data || !data[IFLA_VRF_TABLE]) | |
1403 | return -EINVAL; | |
1404 | ||
1405 | vrf->tb_id = nla_get_u32(data[IFLA_VRF_TABLE]); | |
24c63bbc DA |
1406 | if (vrf->tb_id == RT_TABLE_UNSPEC) |
1407 | return -EINVAL; | |
193125db | 1408 | |
007979ea | 1409 | dev->priv_flags |= IFF_L3MDEV_MASTER; |
193125db | 1410 | |
1aa6c4f6 DA |
1411 | err = register_netdevice(dev); |
1412 | if (err) | |
1413 | goto out; | |
1414 | ||
097d3c95 DA |
1415 | net = dev_net(dev); |
1416 | add_fib_rules = net_generic(net, vrf_net_id); | |
1417 | if (*add_fib_rules) { | |
1aa6c4f6 DA |
1418 | err = vrf_add_fib_rules(dev); |
1419 | if (err) { | |
1420 | unregister_netdevice(dev); | |
1421 | goto out; | |
1422 | } | |
097d3c95 | 1423 | *add_fib_rules = false; |
1aa6c4f6 DA |
1424 | } |
1425 | ||
1426 | out: | |
1427 | return err; | |
193125db DA |
1428 | } |
1429 | ||
1430 | static size_t vrf_nl_getsize(const struct net_device *dev) | |
1431 | { | |
1432 | return nla_total_size(sizeof(u32)); /* IFLA_VRF_TABLE */ | |
1433 | } | |
1434 | ||
1435 | static int vrf_fillinfo(struct sk_buff *skb, | |
1436 | const struct net_device *dev) | |
1437 | { | |
1438 | struct net_vrf *vrf = netdev_priv(dev); | |
1439 | ||
1440 | return nla_put_u32(skb, IFLA_VRF_TABLE, vrf->tb_id); | |
1441 | } | |
1442 | ||
67eb0331 DA |
1443 | static size_t vrf_get_slave_size(const struct net_device *bond_dev, |
1444 | const struct net_device *slave_dev) | |
1445 | { | |
1446 | return nla_total_size(sizeof(u32)); /* IFLA_VRF_PORT_TABLE */ | |
1447 | } | |
1448 | ||
1449 | static int vrf_fill_slave_info(struct sk_buff *skb, | |
1450 | const struct net_device *vrf_dev, | |
1451 | const struct net_device *slave_dev) | |
1452 | { | |
1453 | struct net_vrf *vrf = netdev_priv(vrf_dev); | |
1454 | ||
1455 | if (nla_put_u32(skb, IFLA_VRF_PORT_TABLE, vrf->tb_id)) | |
1456 | return -EMSGSIZE; | |
1457 | ||
1458 | return 0; | |
1459 | } | |
1460 | ||
193125db DA |
1461 | static const struct nla_policy vrf_nl_policy[IFLA_VRF_MAX + 1] = { |
1462 | [IFLA_VRF_TABLE] = { .type = NLA_U32 }, | |
1463 | }; | |
1464 | ||
1465 | static struct rtnl_link_ops vrf_link_ops __read_mostly = { | |
1466 | .kind = DRV_NAME, | |
1467 | .priv_size = sizeof(struct net_vrf), | |
1468 | ||
1469 | .get_size = vrf_nl_getsize, | |
1470 | .policy = vrf_nl_policy, | |
1471 | .validate = vrf_validate, | |
1472 | .fill_info = vrf_fillinfo, | |
1473 | ||
67eb0331 DA |
1474 | .get_slave_size = vrf_get_slave_size, |
1475 | .fill_slave_info = vrf_fill_slave_info, | |
1476 | ||
193125db DA |
1477 | .newlink = vrf_newlink, |
1478 | .dellink = vrf_dellink, | |
1479 | .setup = vrf_setup, | |
1480 | .maxtype = IFLA_VRF_MAX, | |
1481 | }; | |
1482 | ||
1483 | static int vrf_device_event(struct notifier_block *unused, | |
1484 | unsigned long event, void *ptr) | |
1485 | { | |
1486 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
1487 | ||
1488 | /* only care about unregister events to drop slave references */ | |
1489 | if (event == NETDEV_UNREGISTER) { | |
193125db DA |
1490 | struct net_device *vrf_dev; |
1491 | ||
fee6d4c7 | 1492 | if (!netif_is_l3_slave(dev)) |
193125db DA |
1493 | goto out; |
1494 | ||
58aa9087 NA |
1495 | vrf_dev = netdev_master_upper_dev_get(dev); |
1496 | vrf_del_slave(vrf_dev, dev); | |
193125db DA |
1497 | } |
1498 | out: | |
1499 | return NOTIFY_DONE; | |
1500 | } | |
1501 | ||
1502 | static struct notifier_block vrf_notifier_block __read_mostly = { | |
1503 | .notifier_call = vrf_device_event, | |
1504 | }; | |
1505 | ||
097d3c95 DA |
1506 | /* Initialize per network namespace state */ |
1507 | static int __net_init vrf_netns_init(struct net *net) | |
1508 | { | |
1509 | bool *add_fib_rules = net_generic(net, vrf_net_id); | |
1510 | ||
1511 | *add_fib_rules = true; | |
1512 | ||
1513 | return 0; | |
1514 | } | |
1515 | ||
1516 | static struct pernet_operations vrf_net_ops __net_initdata = { | |
1517 | .init = vrf_netns_init, | |
1518 | .id = &vrf_net_id, | |
1519 | .size = sizeof(bool), | |
1520 | }; | |
1521 | ||
193125db DA |
1522 | static int __init vrf_init_module(void) |
1523 | { | |
1524 | int rc; | |
1525 | ||
193125db DA |
1526 | register_netdevice_notifier(&vrf_notifier_block); |
1527 | ||
097d3c95 | 1528 | rc = register_pernet_subsys(&vrf_net_ops); |
193125db DA |
1529 | if (rc < 0) |
1530 | goto error; | |
1531 | ||
097d3c95 DA |
1532 | rc = rtnl_link_register(&vrf_link_ops); |
1533 | if (rc < 0) { | |
1534 | unregister_pernet_subsys(&vrf_net_ops); | |
1535 | goto error; | |
1536 | } | |
1537 | ||
193125db DA |
1538 | return 0; |
1539 | ||
1540 | error: | |
1541 | unregister_netdevice_notifier(&vrf_notifier_block); | |
193125db DA |
1542 | return rc; |
1543 | } | |
1544 | ||
193125db | 1545 | module_init(vrf_init_module); |
193125db DA |
1546 | MODULE_AUTHOR("Shrijeet Mukherjee, David Ahern"); |
1547 | MODULE_DESCRIPTION("Device driver to instantiate VRF domains"); | |
1548 | MODULE_LICENSE("GPL"); | |
1549 | MODULE_ALIAS_RTNL_LINK(DRV_NAME); | |
1550 | MODULE_VERSION(DRV_VERSION); |