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