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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> |
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 DA |
49 | struct rtable __rcu *rth; |
50 | struct rt6_info __rcu *rt6; | |
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); | |
afe80a49 DA |
135 | |
136 | /* set pkt_type to avoid skb hitting packet taps twice - | |
137 | * once on Tx and again in Rx processing | |
138 | */ | |
139 | skb->pkt_type = PACKET_LOOPBACK; | |
140 | ||
141 | skb->protocol = eth_type_trans(skb, dev); | |
142 | ||
143 | if (likely(netif_rx(skb) == NET_RX_SUCCESS)) | |
144 | vrf_rx_stats(dev, len); | |
145 | else | |
146 | this_cpu_inc(dev->dstats->rx_drps); | |
147 | ||
148 | return NETDEV_TX_OK; | |
149 | } | |
150 | ||
35402e31 | 151 | #if IS_ENABLED(CONFIG_IPV6) |
4c1feac5 DA |
152 | static int vrf_ip6_local_out(struct net *net, struct sock *sk, |
153 | struct sk_buff *skb) | |
154 | { | |
155 | int err; | |
156 | ||
157 | err = nf_hook(NFPROTO_IPV6, NF_INET_LOCAL_OUT, net, | |
158 | sk, skb, NULL, skb_dst(skb)->dev, dst_output); | |
159 | ||
160 | if (likely(err == 1)) | |
161 | err = dst_output(net, sk, skb); | |
162 | ||
163 | return err; | |
164 | } | |
165 | ||
35402e31 DA |
166 | static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb, |
167 | struct net_device *dev) | |
168 | { | |
169 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
170 | struct net *net = dev_net(skb->dev); | |
171 | struct flowi6 fl6 = { | |
172 | /* needed to match OIF rule */ | |
173 | .flowi6_oif = dev->ifindex, | |
174 | .flowi6_iif = LOOPBACK_IFINDEX, | |
175 | .daddr = iph->daddr, | |
176 | .saddr = iph->saddr, | |
177 | .flowlabel = ip6_flowinfo(iph), | |
178 | .flowi6_mark = skb->mark, | |
179 | .flowi6_proto = iph->nexthdr, | |
c71ad3d4 | 180 | .flowi6_flags = FLOWI_FLAG_SKIP_NH_OIF, |
35402e31 DA |
181 | }; |
182 | int ret = NET_XMIT_DROP; | |
183 | struct dst_entry *dst; | |
184 | struct dst_entry *dst_null = &net->ipv6.ip6_null_entry->dst; | |
185 | ||
186 | dst = ip6_route_output(net, NULL, &fl6); | |
187 | if (dst == dst_null) | |
188 | goto err; | |
189 | ||
190 | skb_dst_drop(skb); | |
b4869aa2 DA |
191 | |
192 | /* if dst.dev is loopback or the VRF device again this is locally | |
193 | * originated traffic destined to a local address. Short circuit | |
4f04256c | 194 | * to Rx path |
b4869aa2 | 195 | */ |
4f04256c DA |
196 | if (dst->dev == dev) |
197 | return vrf_local_xmit(skb, dev, dst); | |
b4869aa2 | 198 | |
35402e31 DA |
199 | skb_dst_set(skb, dst); |
200 | ||
911a66fb DA |
201 | /* strip the ethernet header added for pass through VRF device */ |
202 | __skb_pull(skb, skb_network_offset(skb)); | |
203 | ||
4c1feac5 | 204 | ret = vrf_ip6_local_out(net, skb->sk, skb); |
35402e31 DA |
205 | if (unlikely(net_xmit_eval(ret))) |
206 | dev->stats.tx_errors++; | |
207 | else | |
208 | ret = NET_XMIT_SUCCESS; | |
209 | ||
210 | return ret; | |
211 | err: | |
212 | vrf_tx_error(dev, skb); | |
213 | return NET_XMIT_DROP; | |
214 | } | |
215 | #else | |
193125db DA |
216 | static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb, |
217 | struct net_device *dev) | |
218 | { | |
57b8efa1 NA |
219 | vrf_tx_error(dev, skb); |
220 | return NET_XMIT_DROP; | |
193125db | 221 | } |
35402e31 | 222 | #endif |
193125db | 223 | |
ebfc102c DA |
224 | /* based on ip_local_out; can't use it b/c the dst is switched pointing to us */ |
225 | static int vrf_ip_local_out(struct net *net, struct sock *sk, | |
226 | struct sk_buff *skb) | |
227 | { | |
228 | int err; | |
229 | ||
230 | err = nf_hook(NFPROTO_IPV4, NF_INET_LOCAL_OUT, net, sk, | |
231 | skb, NULL, skb_dst(skb)->dev, dst_output); | |
232 | if (likely(err == 1)) | |
233 | err = dst_output(net, sk, skb); | |
234 | ||
235 | return err; | |
236 | } | |
237 | ||
193125db DA |
238 | static netdev_tx_t vrf_process_v4_outbound(struct sk_buff *skb, |
239 | struct net_device *vrf_dev) | |
240 | { | |
241 | struct iphdr *ip4h = ip_hdr(skb); | |
242 | int ret = NET_XMIT_DROP; | |
243 | struct flowi4 fl4 = { | |
244 | /* needed to match OIF rule */ | |
245 | .flowi4_oif = vrf_dev->ifindex, | |
246 | .flowi4_iif = LOOPBACK_IFINDEX, | |
247 | .flowi4_tos = RT_TOS(ip4h->tos), | |
c71ad3d4 | 248 | .flowi4_flags = FLOWI_FLAG_ANYSRC | FLOWI_FLAG_SKIP_NH_OIF, |
7a18c5b9 | 249 | .flowi4_proto = ip4h->protocol, |
193125db | 250 | .daddr = ip4h->daddr, |
7a18c5b9 | 251 | .saddr = ip4h->saddr, |
193125db | 252 | }; |
911a66fb DA |
253 | struct net *net = dev_net(vrf_dev); |
254 | struct rtable *rt; | |
255 | ||
256 | rt = ip_route_output_flow(net, &fl4, NULL); | |
257 | if (IS_ERR(rt)) | |
258 | goto err; | |
193125db | 259 | |
911a66fb | 260 | skb_dst_drop(skb); |
afe80a49 DA |
261 | |
262 | /* if dst.dev is loopback or the VRF device again this is locally | |
263 | * originated traffic destined to a local address. Short circuit | |
4f04256c | 264 | * to Rx path |
afe80a49 | 265 | */ |
4f04256c DA |
266 | if (rt->dst.dev == vrf_dev) |
267 | return vrf_local_xmit(skb, vrf_dev, &rt->dst); | |
afe80a49 | 268 | |
911a66fb DA |
269 | skb_dst_set(skb, &rt->dst); |
270 | ||
271 | /* strip the ethernet header added for pass through VRF device */ | |
272 | __skb_pull(skb, skb_network_offset(skb)); | |
193125db DA |
273 | |
274 | if (!ip4h->saddr) { | |
275 | ip4h->saddr = inet_select_addr(skb_dst(skb)->dev, 0, | |
276 | RT_SCOPE_LINK); | |
277 | } | |
278 | ||
ebfc102c | 279 | ret = vrf_ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb); |
193125db DA |
280 | if (unlikely(net_xmit_eval(ret))) |
281 | vrf_dev->stats.tx_errors++; | |
282 | else | |
283 | ret = NET_XMIT_SUCCESS; | |
284 | ||
285 | out: | |
286 | return ret; | |
287 | err: | |
57b8efa1 | 288 | vrf_tx_error(vrf_dev, skb); |
193125db DA |
289 | goto out; |
290 | } | |
291 | ||
292 | static netdev_tx_t is_ip_tx_frame(struct sk_buff *skb, struct net_device *dev) | |
293 | { | |
294 | switch (skb->protocol) { | |
295 | case htons(ETH_P_IP): | |
296 | return vrf_process_v4_outbound(skb, dev); | |
297 | case htons(ETH_P_IPV6): | |
298 | return vrf_process_v6_outbound(skb, dev); | |
299 | default: | |
57b8efa1 | 300 | vrf_tx_error(dev, skb); |
193125db DA |
301 | return NET_XMIT_DROP; |
302 | } | |
303 | } | |
304 | ||
305 | static netdev_tx_t vrf_xmit(struct sk_buff *skb, struct net_device *dev) | |
306 | { | |
f7887d40 | 307 | int len = skb->len; |
193125db DA |
308 | netdev_tx_t ret = is_ip_tx_frame(skb, dev); |
309 | ||
310 | if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { | |
311 | struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats); | |
312 | ||
313 | u64_stats_update_begin(&dstats->syncp); | |
314 | dstats->tx_pkts++; | |
f7887d40 | 315 | dstats->tx_bytes += len; |
193125db DA |
316 | u64_stats_update_end(&dstats->syncp); |
317 | } else { | |
318 | this_cpu_inc(dev->dstats->tx_drps); | |
319 | } | |
320 | ||
321 | return ret; | |
322 | } | |
323 | ||
dcdd43c4 DA |
324 | static int vrf_finish_direct(struct net *net, struct sock *sk, |
325 | struct sk_buff *skb) | |
326 | { | |
327 | struct net_device *vrf_dev = skb->dev; | |
328 | ||
329 | if (!list_empty(&vrf_dev->ptype_all) && | |
330 | likely(skb_headroom(skb) >= ETH_HLEN)) { | |
d58ff351 | 331 | struct ethhdr *eth = skb_push(skb, ETH_HLEN); |
dcdd43c4 DA |
332 | |
333 | ether_addr_copy(eth->h_source, vrf_dev->dev_addr); | |
334 | eth_zero_addr(eth->h_dest); | |
335 | eth->h_proto = skb->protocol; | |
336 | ||
337 | rcu_read_lock_bh(); | |
338 | dev_queue_xmit_nit(skb, vrf_dev); | |
339 | rcu_read_unlock_bh(); | |
340 | ||
341 | skb_pull(skb, ETH_HLEN); | |
342 | } | |
343 | ||
344 | return 1; | |
345 | } | |
346 | ||
35402e31 | 347 | #if IS_ENABLED(CONFIG_IPV6) |
35402e31 DA |
348 | /* modelled after ip6_finish_output2 */ |
349 | static int vrf_finish_output6(struct net *net, struct sock *sk, | |
350 | struct sk_buff *skb) | |
351 | { | |
352 | struct dst_entry *dst = skb_dst(skb); | |
353 | struct net_device *dev = dst->dev; | |
354 | struct neighbour *neigh; | |
355 | struct in6_addr *nexthop; | |
356 | int ret; | |
357 | ||
eb63ecc1 DA |
358 | nf_reset(skb); |
359 | ||
35402e31 DA |
360 | skb->protocol = htons(ETH_P_IPV6); |
361 | skb->dev = dev; | |
362 | ||
363 | rcu_read_lock_bh(); | |
364 | nexthop = rt6_nexthop((struct rt6_info *)dst, &ipv6_hdr(skb)->daddr); | |
365 | neigh = __ipv6_neigh_lookup_noref(dst->dev, nexthop); | |
366 | if (unlikely(!neigh)) | |
367 | neigh = __neigh_create(&nd_tbl, nexthop, dst->dev, false); | |
368 | if (!IS_ERR(neigh)) { | |
4ff06203 | 369 | sock_confirm_neigh(skb, neigh); |
c16ec185 | 370 | ret = neigh_output(neigh, skb); |
35402e31 DA |
371 | rcu_read_unlock_bh(); |
372 | return ret; | |
373 | } | |
374 | rcu_read_unlock_bh(); | |
375 | ||
376 | IP6_INC_STATS(dev_net(dst->dev), | |
377 | ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES); | |
378 | kfree_skb(skb); | |
379 | return -EINVAL; | |
380 | } | |
381 | ||
382 | /* modelled after ip6_output */ | |
383 | static int vrf_output6(struct net *net, struct sock *sk, struct sk_buff *skb) | |
384 | { | |
385 | return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING, | |
386 | net, sk, skb, NULL, skb_dst(skb)->dev, | |
387 | vrf_finish_output6, | |
388 | !(IP6CB(skb)->flags & IP6SKB_REROUTED)); | |
389 | } | |
390 | ||
4c1feac5 DA |
391 | /* set dst on skb to send packet to us via dev_xmit path. Allows |
392 | * packet to go through device based features such as qdisc, netfilter | |
393 | * hooks and packet sockets with skb->dev set to vrf device. | |
394 | */ | |
a9ec54d1 DA |
395 | static struct sk_buff *vrf_ip6_out_redirect(struct net_device *vrf_dev, |
396 | struct sk_buff *skb) | |
4c1feac5 DA |
397 | { |
398 | struct net_vrf *vrf = netdev_priv(vrf_dev); | |
399 | struct dst_entry *dst = NULL; | |
400 | struct rt6_info *rt6; | |
401 | ||
4c1feac5 DA |
402 | rcu_read_lock(); |
403 | ||
404 | rt6 = rcu_dereference(vrf->rt6); | |
405 | if (likely(rt6)) { | |
406 | dst = &rt6->dst; | |
407 | dst_hold(dst); | |
408 | } | |
409 | ||
410 | rcu_read_unlock(); | |
411 | ||
412 | if (unlikely(!dst)) { | |
413 | vrf_tx_error(vrf_dev, skb); | |
414 | return NULL; | |
415 | } | |
416 | ||
417 | skb_dst_drop(skb); | |
418 | skb_dst_set(skb, dst); | |
419 | ||
420 | return skb; | |
421 | } | |
422 | ||
a9ec54d1 DA |
423 | static int vrf_output6_direct(struct net *net, struct sock *sk, |
424 | struct sk_buff *skb) | |
425 | { | |
426 | skb->protocol = htons(ETH_P_IPV6); | |
427 | ||
428 | return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING, | |
429 | net, sk, skb, NULL, skb->dev, | |
430 | vrf_finish_direct, | |
431 | !(IPCB(skb)->flags & IPSKB_REROUTED)); | |
432 | } | |
433 | ||
434 | static struct sk_buff *vrf_ip6_out_direct(struct net_device *vrf_dev, | |
435 | struct sock *sk, | |
436 | struct sk_buff *skb) | |
437 | { | |
438 | struct net *net = dev_net(vrf_dev); | |
439 | int err; | |
440 | ||
441 | skb->dev = vrf_dev; | |
442 | ||
443 | err = nf_hook(NFPROTO_IPV6, NF_INET_LOCAL_OUT, net, sk, | |
444 | skb, NULL, vrf_dev, vrf_output6_direct); | |
445 | ||
446 | if (likely(err == 1)) | |
447 | err = vrf_output6_direct(net, sk, skb); | |
448 | ||
449 | /* reset skb device */ | |
450 | if (likely(err == 1)) | |
451 | nf_reset(skb); | |
452 | else | |
453 | skb = NULL; | |
454 | ||
455 | return skb; | |
456 | } | |
457 | ||
458 | static struct sk_buff *vrf_ip6_out(struct net_device *vrf_dev, | |
459 | struct sock *sk, | |
460 | struct sk_buff *skb) | |
461 | { | |
462 | /* don't divert link scope packets */ | |
463 | if (rt6_need_strict(&ipv6_hdr(skb)->daddr)) | |
464 | return skb; | |
465 | ||
466 | if (qdisc_tx_is_default(vrf_dev)) | |
467 | return vrf_ip6_out_direct(vrf_dev, sk, skb); | |
468 | ||
469 | return vrf_ip6_out_redirect(vrf_dev, skb); | |
470 | } | |
471 | ||
b0e95ccd | 472 | /* holding rtnl */ |
810e530b | 473 | static void vrf_rt6_release(struct net_device *dev, struct net_vrf *vrf) |
35402e31 | 474 | { |
b0e95ccd | 475 | struct rt6_info *rt6 = rtnl_dereference(vrf->rt6); |
810e530b DA |
476 | struct net *net = dev_net(dev); |
477 | struct dst_entry *dst; | |
b0e95ccd | 478 | |
b4869aa2 | 479 | RCU_INIT_POINTER(vrf->rt6, NULL); |
b4869aa2 | 480 | synchronize_rcu(); |
b0e95ccd | 481 | |
810e530b DA |
482 | /* move dev in dst's to loopback so this VRF device can be deleted |
483 | * - based on dst_ifdown | |
484 | */ | |
485 | if (rt6) { | |
486 | dst = &rt6->dst; | |
487 | dev_put(dst->dev); | |
488 | dst->dev = net->loopback_dev; | |
489 | dev_hold(dst->dev); | |
490 | dst_release(dst); | |
491 | } | |
35402e31 DA |
492 | } |
493 | ||
494 | static int vrf_rt6_create(struct net_device *dev) | |
495 | { | |
a4c2fd7f | 496 | int flags = DST_HOST | DST_NOPOLICY | DST_NOXFRM; |
35402e31 | 497 | struct net_vrf *vrf = netdev_priv(dev); |
9ab179d8 | 498 | struct net *net = dev_net(dev); |
b3b4663c | 499 | struct fib6_table *rt6i_table; |
4f04256c | 500 | struct rt6_info *rt6; |
35402e31 DA |
501 | int rc = -ENOMEM; |
502 | ||
e4348637 DA |
503 | /* IPv6 can be CONFIG enabled and then disabled runtime */ |
504 | if (!ipv6_mod_enabled()) | |
505 | return 0; | |
506 | ||
b3b4663c DA |
507 | rt6i_table = fib6_new_table(net, vrf->tb_id); |
508 | if (!rt6i_table) | |
509 | goto out; | |
510 | ||
b4869aa2 DA |
511 | /* create a dst for routing packets out a VRF device */ |
512 | rt6 = ip6_dst_alloc(net, dev, flags); | |
35402e31 DA |
513 | if (!rt6) |
514 | goto out; | |
515 | ||
b3b4663c DA |
516 | rt6->rt6i_table = rt6i_table; |
517 | rt6->dst.output = vrf_output6; | |
b4869aa2 | 518 | |
b0e95ccd DA |
519 | rcu_assign_pointer(vrf->rt6, rt6); |
520 | ||
35402e31 DA |
521 | rc = 0; |
522 | out: | |
523 | return rc; | |
524 | } | |
525 | #else | |
4c1feac5 DA |
526 | static struct sk_buff *vrf_ip6_out(struct net_device *vrf_dev, |
527 | struct sock *sk, | |
528 | struct sk_buff *skb) | |
529 | { | |
530 | return skb; | |
531 | } | |
532 | ||
810e530b | 533 | static void vrf_rt6_release(struct net_device *dev, struct net_vrf *vrf) |
35402e31 DA |
534 | { |
535 | } | |
536 | ||
537 | static int vrf_rt6_create(struct net_device *dev) | |
538 | { | |
539 | return 0; | |
540 | } | |
541 | #endif | |
542 | ||
8f58336d | 543 | /* modelled after ip_finish_output2 */ |
0c4b51f0 | 544 | static int vrf_finish_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
193125db | 545 | { |
8f58336d DA |
546 | struct dst_entry *dst = skb_dst(skb); |
547 | struct rtable *rt = (struct rtable *)dst; | |
548 | struct net_device *dev = dst->dev; | |
549 | unsigned int hh_len = LL_RESERVED_SPACE(dev); | |
550 | struct neighbour *neigh; | |
551 | u32 nexthop; | |
552 | int ret = -EINVAL; | |
553 | ||
eb63ecc1 DA |
554 | nf_reset(skb); |
555 | ||
8f58336d DA |
556 | /* Be paranoid, rather than too clever. */ |
557 | if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) { | |
558 | struct sk_buff *skb2; | |
559 | ||
560 | skb2 = skb_realloc_headroom(skb, LL_RESERVED_SPACE(dev)); | |
561 | if (!skb2) { | |
562 | ret = -ENOMEM; | |
563 | goto err; | |
564 | } | |
565 | if (skb->sk) | |
566 | skb_set_owner_w(skb2, skb->sk); | |
567 | ||
568 | consume_skb(skb); | |
569 | skb = skb2; | |
570 | } | |
571 | ||
572 | rcu_read_lock_bh(); | |
573 | ||
574 | nexthop = (__force u32)rt_nexthop(rt, ip_hdr(skb)->daddr); | |
575 | neigh = __ipv4_neigh_lookup_noref(dev, nexthop); | |
576 | if (unlikely(!neigh)) | |
577 | neigh = __neigh_create(&arp_tbl, &nexthop, dev, false); | |
4ff06203 JA |
578 | if (!IS_ERR(neigh)) { |
579 | sock_confirm_neigh(skb, neigh); | |
c16ec185 | 580 | ret = neigh_output(neigh, skb); |
4ff06203 | 581 | } |
8f58336d DA |
582 | |
583 | rcu_read_unlock_bh(); | |
584 | err: | |
585 | if (unlikely(ret < 0)) | |
586 | vrf_tx_error(skb->dev, skb); | |
587 | return ret; | |
193125db DA |
588 | } |
589 | ||
ede2059d | 590 | static int vrf_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
193125db DA |
591 | { |
592 | struct net_device *dev = skb_dst(skb)->dev; | |
593 | ||
29a26a56 | 594 | IP_UPD_PO_STATS(net, IPSTATS_MIB_OUT, skb->len); |
193125db DA |
595 | |
596 | skb->dev = dev; | |
597 | skb->protocol = htons(ETH_P_IP); | |
598 | ||
29a26a56 EB |
599 | return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING, |
600 | net, sk, skb, NULL, dev, | |
8f58336d | 601 | vrf_finish_output, |
193125db DA |
602 | !(IPCB(skb)->flags & IPSKB_REROUTED)); |
603 | } | |
604 | ||
ebfc102c DA |
605 | /* set dst on skb to send packet to us via dev_xmit path. Allows |
606 | * packet to go through device based features such as qdisc, netfilter | |
607 | * hooks and packet sockets with skb->dev set to vrf device. | |
608 | */ | |
dcdd43c4 DA |
609 | static struct sk_buff *vrf_ip_out_redirect(struct net_device *vrf_dev, |
610 | struct sk_buff *skb) | |
ebfc102c DA |
611 | { |
612 | struct net_vrf *vrf = netdev_priv(vrf_dev); | |
613 | struct dst_entry *dst = NULL; | |
614 | struct rtable *rth; | |
615 | ||
616 | rcu_read_lock(); | |
617 | ||
618 | rth = rcu_dereference(vrf->rth); | |
619 | if (likely(rth)) { | |
620 | dst = &rth->dst; | |
621 | dst_hold(dst); | |
622 | } | |
623 | ||
624 | rcu_read_unlock(); | |
625 | ||
626 | if (unlikely(!dst)) { | |
627 | vrf_tx_error(vrf_dev, skb); | |
628 | return NULL; | |
629 | } | |
630 | ||
631 | skb_dst_drop(skb); | |
632 | skb_dst_set(skb, dst); | |
633 | ||
634 | return skb; | |
635 | } | |
636 | ||
dcdd43c4 DA |
637 | static int vrf_output_direct(struct net *net, struct sock *sk, |
638 | struct sk_buff *skb) | |
639 | { | |
640 | skb->protocol = htons(ETH_P_IP); | |
641 | ||
642 | return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING, | |
643 | net, sk, skb, NULL, skb->dev, | |
644 | vrf_finish_direct, | |
645 | !(IPCB(skb)->flags & IPSKB_REROUTED)); | |
646 | } | |
647 | ||
648 | static struct sk_buff *vrf_ip_out_direct(struct net_device *vrf_dev, | |
649 | struct sock *sk, | |
650 | struct sk_buff *skb) | |
651 | { | |
652 | struct net *net = dev_net(vrf_dev); | |
653 | int err; | |
654 | ||
655 | skb->dev = vrf_dev; | |
656 | ||
657 | err = nf_hook(NFPROTO_IPV4, NF_INET_LOCAL_OUT, net, sk, | |
658 | skb, NULL, vrf_dev, vrf_output_direct); | |
659 | ||
660 | if (likely(err == 1)) | |
661 | err = vrf_output_direct(net, sk, skb); | |
662 | ||
663 | /* reset skb device */ | |
664 | if (likely(err == 1)) | |
665 | nf_reset(skb); | |
666 | else | |
667 | skb = NULL; | |
668 | ||
669 | return skb; | |
670 | } | |
671 | ||
672 | static struct sk_buff *vrf_ip_out(struct net_device *vrf_dev, | |
673 | struct sock *sk, | |
674 | struct sk_buff *skb) | |
675 | { | |
676 | /* don't divert multicast */ | |
677 | if (ipv4_is_multicast(ip_hdr(skb)->daddr)) | |
678 | return skb; | |
679 | ||
680 | if (qdisc_tx_is_default(vrf_dev)) | |
681 | return vrf_ip_out_direct(vrf_dev, sk, skb); | |
682 | ||
683 | return vrf_ip_out_redirect(vrf_dev, skb); | |
684 | } | |
685 | ||
ebfc102c DA |
686 | /* called with rcu lock held */ |
687 | static struct sk_buff *vrf_l3_out(struct net_device *vrf_dev, | |
688 | struct sock *sk, | |
689 | struct sk_buff *skb, | |
690 | u16 proto) | |
691 | { | |
692 | switch (proto) { | |
693 | case AF_INET: | |
694 | return vrf_ip_out(vrf_dev, sk, skb); | |
4c1feac5 DA |
695 | case AF_INET6: |
696 | return vrf_ip6_out(vrf_dev, sk, skb); | |
ebfc102c DA |
697 | } |
698 | ||
699 | return skb; | |
700 | } | |
701 | ||
b0e95ccd | 702 | /* holding rtnl */ |
810e530b | 703 | static void vrf_rtable_release(struct net_device *dev, struct net_vrf *vrf) |
193125db | 704 | { |
b0e95ccd | 705 | struct rtable *rth = rtnl_dereference(vrf->rth); |
810e530b DA |
706 | struct net *net = dev_net(dev); |
707 | struct dst_entry *dst; | |
b0e95ccd | 708 | |
afe80a49 | 709 | RCU_INIT_POINTER(vrf->rth, NULL); |
afe80a49 | 710 | synchronize_rcu(); |
193125db | 711 | |
810e530b DA |
712 | /* move dev in dst's to loopback so this VRF device can be deleted |
713 | * - based on dst_ifdown | |
714 | */ | |
715 | if (rth) { | |
716 | dst = &rth->dst; | |
717 | dev_put(dst->dev); | |
718 | dst->dev = net->loopback_dev; | |
719 | dev_hold(dst->dev); | |
720 | dst_release(dst); | |
721 | } | |
193125db DA |
722 | } |
723 | ||
b0e95ccd | 724 | static int vrf_rtable_create(struct net_device *dev) |
193125db | 725 | { |
b7503e0c | 726 | struct net_vrf *vrf = netdev_priv(dev); |
4f04256c | 727 | struct rtable *rth; |
193125db | 728 | |
b3b4663c | 729 | if (!fib_new_table(dev_net(dev), vrf->tb_id)) |
b0e95ccd | 730 | return -ENOMEM; |
b3b4663c | 731 | |
afe80a49 | 732 | /* create a dst for routing packets out through a VRF device */ |
9ab179d8 | 733 | rth = rt_dst_alloc(dev, 0, RTN_UNICAST, 1, 1, 0); |
b0e95ccd DA |
734 | if (!rth) |
735 | return -ENOMEM; | |
193125db | 736 | |
b0e95ccd DA |
737 | rth->dst.output = vrf_output; |
738 | rth->rt_table_id = vrf->tb_id; | |
739 | ||
740 | rcu_assign_pointer(vrf->rth, rth); | |
741 | ||
742 | return 0; | |
193125db DA |
743 | } |
744 | ||
745 | /**************************** device handling ********************/ | |
746 | ||
747 | /* cycle interface to flush neighbor cache and move routes across tables */ | |
748 | static void cycle_netdev(struct net_device *dev) | |
749 | { | |
750 | unsigned int flags = dev->flags; | |
751 | int ret; | |
752 | ||
753 | if (!netif_running(dev)) | |
754 | return; | |
755 | ||
756 | ret = dev_change_flags(dev, flags & ~IFF_UP); | |
757 | if (ret >= 0) | |
758 | ret = dev_change_flags(dev, flags); | |
759 | ||
760 | if (ret < 0) { | |
761 | netdev_err(dev, | |
762 | "Failed to cycle device %s; route tables might be wrong!\n", | |
763 | dev->name); | |
764 | } | |
765 | } | |
766 | ||
42ab19ee DA |
767 | static int do_vrf_add_slave(struct net_device *dev, struct net_device *port_dev, |
768 | struct netlink_ext_ack *extack) | |
193125db | 769 | { |
bad53162 | 770 | int ret; |
193125db | 771 | |
26d31ac1 DA |
772 | /* do not allow loopback device to be enslaved to a VRF. |
773 | * The vrf device acts as the loopback for the vrf. | |
774 | */ | |
de3baa3e DA |
775 | if (port_dev == dev_net(dev)->loopback_dev) { |
776 | NL_SET_ERR_MSG(extack, | |
777 | "Can not enslave loopback device to a VRF"); | |
26d31ac1 | 778 | return -EOPNOTSUPP; |
de3baa3e | 779 | } |
26d31ac1 | 780 | |
fdeea7be | 781 | port_dev->priv_flags |= IFF_L3MDEV_SLAVE; |
42ab19ee | 782 | ret = netdev_master_upper_dev_link(port_dev, dev, NULL, NULL, extack); |
193125db | 783 | if (ret < 0) |
fdeea7be | 784 | goto err; |
193125db | 785 | |
193125db DA |
786 | cycle_netdev(port_dev); |
787 | ||
788 | return 0; | |
fdeea7be IS |
789 | |
790 | err: | |
791 | port_dev->priv_flags &= ~IFF_L3MDEV_SLAVE; | |
792 | return ret; | |
193125db DA |
793 | } |
794 | ||
33eaf2a6 DA |
795 | static int vrf_add_slave(struct net_device *dev, struct net_device *port_dev, |
796 | struct netlink_ext_ack *extack) | |
193125db | 797 | { |
de3baa3e DA |
798 | if (netif_is_l3_master(port_dev)) { |
799 | NL_SET_ERR_MSG(extack, | |
800 | "Can not enslave an L3 master device to a VRF"); | |
801 | return -EINVAL; | |
802 | } | |
803 | ||
804 | if (netif_is_l3_slave(port_dev)) | |
193125db DA |
805 | return -EINVAL; |
806 | ||
42ab19ee | 807 | return do_vrf_add_slave(dev, port_dev, extack); |
193125db DA |
808 | } |
809 | ||
810 | /* inverse of do_vrf_add_slave */ | |
811 | static int do_vrf_del_slave(struct net_device *dev, struct net_device *port_dev) | |
812 | { | |
193125db | 813 | netdev_upper_dev_unlink(port_dev, dev); |
fee6d4c7 | 814 | port_dev->priv_flags &= ~IFF_L3MDEV_SLAVE; |
193125db | 815 | |
193125db DA |
816 | cycle_netdev(port_dev); |
817 | ||
193125db DA |
818 | return 0; |
819 | } | |
820 | ||
821 | static int vrf_del_slave(struct net_device *dev, struct net_device *port_dev) | |
822 | { | |
193125db DA |
823 | return do_vrf_del_slave(dev, port_dev); |
824 | } | |
825 | ||
826 | static void vrf_dev_uninit(struct net_device *dev) | |
827 | { | |
828 | struct net_vrf *vrf = netdev_priv(dev); | |
193125db | 829 | |
810e530b DA |
830 | vrf_rtable_release(dev, vrf); |
831 | vrf_rt6_release(dev, vrf); | |
193125db | 832 | |
3a4a27d3 | 833 | free_percpu(dev->dstats); |
193125db DA |
834 | dev->dstats = NULL; |
835 | } | |
836 | ||
837 | static int vrf_dev_init(struct net_device *dev) | |
838 | { | |
839 | struct net_vrf *vrf = netdev_priv(dev); | |
840 | ||
193125db DA |
841 | dev->dstats = netdev_alloc_pcpu_stats(struct pcpu_dstats); |
842 | if (!dev->dstats) | |
843 | goto out_nomem; | |
844 | ||
845 | /* create the default dst which points back to us */ | |
b0e95ccd | 846 | if (vrf_rtable_create(dev) != 0) |
193125db DA |
847 | goto out_stats; |
848 | ||
35402e31 DA |
849 | if (vrf_rt6_create(dev) != 0) |
850 | goto out_rth; | |
851 | ||
193125db DA |
852 | dev->flags = IFF_MASTER | IFF_NOARP; |
853 | ||
b87ab6b8 DA |
854 | /* MTU is irrelevant for VRF device; set to 64k similar to lo */ |
855 | dev->mtu = 64 * 1024; | |
856 | ||
857 | /* similarly, oper state is irrelevant; set to up to avoid confusion */ | |
858 | dev->operstate = IF_OPER_UP; | |
78e7a2ae | 859 | netdev_lockdep_set_classes(dev); |
193125db DA |
860 | return 0; |
861 | ||
35402e31 | 862 | out_rth: |
810e530b | 863 | vrf_rtable_release(dev, vrf); |
193125db DA |
864 | out_stats: |
865 | free_percpu(dev->dstats); | |
866 | dev->dstats = NULL; | |
867 | out_nomem: | |
868 | return -ENOMEM; | |
869 | } | |
870 | ||
871 | static const struct net_device_ops vrf_netdev_ops = { | |
872 | .ndo_init = vrf_dev_init, | |
873 | .ndo_uninit = vrf_dev_uninit, | |
874 | .ndo_start_xmit = vrf_xmit, | |
875 | .ndo_get_stats64 = vrf_get_stats64, | |
876 | .ndo_add_slave = vrf_add_slave, | |
877 | .ndo_del_slave = vrf_del_slave, | |
878 | }; | |
879 | ||
ee15ee5d DA |
880 | static u32 vrf_fib_table(const struct net_device *dev) |
881 | { | |
882 | struct net_vrf *vrf = netdev_priv(dev); | |
883 | ||
884 | return vrf->tb_id; | |
885 | } | |
886 | ||
73e20b76 DA |
887 | static int vrf_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb) |
888 | { | |
1a4a5bf5 | 889 | kfree_skb(skb); |
73e20b76 DA |
890 | return 0; |
891 | } | |
892 | ||
893 | static struct sk_buff *vrf_rcv_nfhook(u8 pf, unsigned int hook, | |
894 | struct sk_buff *skb, | |
895 | struct net_device *dev) | |
896 | { | |
897 | struct net *net = dev_net(dev); | |
898 | ||
1a4a5bf5 | 899 | if (nf_hook(pf, hook, net, NULL, skb, dev, NULL, vrf_rcv_finish) != 1) |
73e20b76 DA |
900 | skb = NULL; /* kfree_skb(skb) handled by nf code */ |
901 | ||
902 | return skb; | |
903 | } | |
904 | ||
74b20582 DA |
905 | #if IS_ENABLED(CONFIG_IPV6) |
906 | /* neighbor handling is done with actual device; do not want | |
907 | * to flip skb->dev for those ndisc packets. This really fails | |
908 | * for multiple next protocols (e.g., NEXTHDR_HOP). But it is | |
909 | * a start. | |
910 | */ | |
911 | static bool ipv6_ndisc_frame(const struct sk_buff *skb) | |
912 | { | |
913 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
914 | bool rc = false; | |
915 | ||
916 | if (iph->nexthdr == NEXTHDR_ICMP) { | |
917 | const struct icmp6hdr *icmph; | |
918 | struct icmp6hdr _icmph; | |
919 | ||
920 | icmph = skb_header_pointer(skb, sizeof(*iph), | |
921 | sizeof(_icmph), &_icmph); | |
922 | if (!icmph) | |
923 | goto out; | |
924 | ||
925 | switch (icmph->icmp6_type) { | |
926 | case NDISC_ROUTER_SOLICITATION: | |
927 | case NDISC_ROUTER_ADVERTISEMENT: | |
928 | case NDISC_NEIGHBOUR_SOLICITATION: | |
929 | case NDISC_NEIGHBOUR_ADVERTISEMENT: | |
930 | case NDISC_REDIRECT: | |
931 | rc = true; | |
932 | break; | |
933 | } | |
934 | } | |
935 | ||
936 | out: | |
937 | return rc; | |
938 | } | |
939 | ||
9ff74384 DA |
940 | static struct rt6_info *vrf_ip6_route_lookup(struct net *net, |
941 | const struct net_device *dev, | |
942 | struct flowi6 *fl6, | |
943 | int ifindex, | |
944 | int flags) | |
945 | { | |
946 | struct net_vrf *vrf = netdev_priv(dev); | |
947 | struct fib6_table *table = NULL; | |
948 | struct rt6_info *rt6; | |
949 | ||
950 | rcu_read_lock(); | |
951 | ||
952 | /* fib6_table does not have a refcnt and can not be freed */ | |
953 | rt6 = rcu_dereference(vrf->rt6); | |
954 | if (likely(rt6)) | |
955 | table = rt6->rt6i_table; | |
956 | ||
957 | rcu_read_unlock(); | |
958 | ||
959 | if (!table) | |
960 | return NULL; | |
961 | ||
962 | return ip6_pol_route(net, table, ifindex, fl6, flags); | |
963 | } | |
964 | ||
965 | static void vrf_ip6_input_dst(struct sk_buff *skb, struct net_device *vrf_dev, | |
966 | int ifindex) | |
967 | { | |
968 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
969 | struct flowi6 fl6 = { | |
ecf09117 AB |
970 | .flowi6_iif = ifindex, |
971 | .flowi6_mark = skb->mark, | |
972 | .flowi6_proto = iph->nexthdr, | |
9ff74384 DA |
973 | .daddr = iph->daddr, |
974 | .saddr = iph->saddr, | |
975 | .flowlabel = ip6_flowinfo(iph), | |
9ff74384 DA |
976 | }; |
977 | struct net *net = dev_net(vrf_dev); | |
978 | struct rt6_info *rt6; | |
979 | ||
980 | rt6 = vrf_ip6_route_lookup(net, vrf_dev, &fl6, ifindex, | |
981 | RT6_LOOKUP_F_HAS_SADDR | RT6_LOOKUP_F_IFACE); | |
982 | if (unlikely(!rt6)) | |
983 | return; | |
984 | ||
985 | if (unlikely(&rt6->dst == &net->ipv6.ip6_null_entry->dst)) | |
986 | return; | |
987 | ||
988 | skb_dst_set(skb, &rt6->dst); | |
989 | } | |
990 | ||
74b20582 DA |
991 | static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev, |
992 | struct sk_buff *skb) | |
993 | { | |
9ff74384 DA |
994 | int orig_iif = skb->skb_iif; |
995 | bool need_strict; | |
996 | ||
b4869aa2 DA |
997 | /* loopback traffic; do not push through packet taps again. |
998 | * Reset pkt_type for upper layers to process skb | |
999 | */ | |
1000 | if (skb->pkt_type == PACKET_LOOPBACK) { | |
1001 | skb->dev = vrf_dev; | |
1002 | skb->skb_iif = vrf_dev->ifindex; | |
a04a480d | 1003 | IP6CB(skb)->flags |= IP6SKB_L3SLAVE; |
b4869aa2 DA |
1004 | skb->pkt_type = PACKET_HOST; |
1005 | goto out; | |
1006 | } | |
1007 | ||
9ff74384 DA |
1008 | /* if packet is NDISC or addressed to multicast or link-local |
1009 | * then keep the ingress interface | |
1010 | */ | |
1011 | need_strict = rt6_need_strict(&ipv6_hdr(skb)->daddr); | |
1012 | if (!ipv6_ndisc_frame(skb) && !need_strict) { | |
926d93a3 | 1013 | vrf_rx_stats(vrf_dev, skb->len); |
74b20582 DA |
1014 | skb->dev = vrf_dev; |
1015 | skb->skb_iif = vrf_dev->ifindex; | |
1016 | ||
a9ec54d1 DA |
1017 | if (!list_empty(&vrf_dev->ptype_all)) { |
1018 | skb_push(skb, skb->mac_len); | |
1019 | dev_queue_xmit_nit(skb, vrf_dev); | |
1020 | skb_pull(skb, skb->mac_len); | |
1021 | } | |
74b20582 DA |
1022 | |
1023 | IP6CB(skb)->flags |= IP6SKB_L3SLAVE; | |
1024 | } | |
1025 | ||
9ff74384 DA |
1026 | if (need_strict) |
1027 | vrf_ip6_input_dst(skb, vrf_dev, orig_iif); | |
1028 | ||
73e20b76 | 1029 | skb = vrf_rcv_nfhook(NFPROTO_IPV6, NF_INET_PRE_ROUTING, skb, vrf_dev); |
b4869aa2 | 1030 | out: |
74b20582 DA |
1031 | return skb; |
1032 | } | |
1033 | ||
1034 | #else | |
1035 | static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev, | |
1036 | struct sk_buff *skb) | |
1037 | { | |
1038 | return skb; | |
1039 | } | |
1040 | #endif | |
1041 | ||
1042 | static struct sk_buff *vrf_ip_rcv(struct net_device *vrf_dev, | |
1043 | struct sk_buff *skb) | |
1044 | { | |
1045 | skb->dev = vrf_dev; | |
1046 | skb->skb_iif = vrf_dev->ifindex; | |
a04a480d | 1047 | IPCB(skb)->flags |= IPSKB_L3SLAVE; |
74b20582 | 1048 | |
e58e4159 DA |
1049 | if (ipv4_is_multicast(ip_hdr(skb)->daddr)) |
1050 | goto out; | |
1051 | ||
afe80a49 DA |
1052 | /* loopback traffic; do not push through packet taps again. |
1053 | * Reset pkt_type for upper layers to process skb | |
1054 | */ | |
1055 | if (skb->pkt_type == PACKET_LOOPBACK) { | |
1056 | skb->pkt_type = PACKET_HOST; | |
1057 | goto out; | |
1058 | } | |
1059 | ||
926d93a3 DA |
1060 | vrf_rx_stats(vrf_dev, skb->len); |
1061 | ||
dcdd43c4 DA |
1062 | if (!list_empty(&vrf_dev->ptype_all)) { |
1063 | skb_push(skb, skb->mac_len); | |
1064 | dev_queue_xmit_nit(skb, vrf_dev); | |
1065 | skb_pull(skb, skb->mac_len); | |
1066 | } | |
74b20582 | 1067 | |
73e20b76 | 1068 | skb = vrf_rcv_nfhook(NFPROTO_IPV4, NF_INET_PRE_ROUTING, skb, vrf_dev); |
afe80a49 | 1069 | out: |
74b20582 DA |
1070 | return skb; |
1071 | } | |
1072 | ||
1073 | /* called with rcu lock held */ | |
1074 | static struct sk_buff *vrf_l3_rcv(struct net_device *vrf_dev, | |
1075 | struct sk_buff *skb, | |
1076 | u16 proto) | |
1077 | { | |
1078 | switch (proto) { | |
1079 | case AF_INET: | |
1080 | return vrf_ip_rcv(vrf_dev, skb); | |
1081 | case AF_INET6: | |
1082 | return vrf_ip6_rcv(vrf_dev, skb); | |
1083 | } | |
1084 | ||
1085 | return skb; | |
1086 | } | |
1087 | ||
35402e31 | 1088 | #if IS_ENABLED(CONFIG_IPV6) |
4c1feac5 DA |
1089 | /* send to link-local or multicast address via interface enslaved to |
1090 | * VRF device. Force lookup to VRF table without changing flow struct | |
1091 | */ | |
1092 | static struct dst_entry *vrf_link_scope_lookup(const struct net_device *dev, | |
1093 | struct flowi6 *fl6) | |
35402e31 | 1094 | { |
9ff74384 | 1095 | struct net *net = dev_net(dev); |
4c1feac5 | 1096 | int flags = RT6_LOOKUP_F_IFACE; |
b0e95ccd | 1097 | struct dst_entry *dst = NULL; |
9ff74384 | 1098 | struct rt6_info *rt; |
35402e31 | 1099 | |
4c1feac5 DA |
1100 | /* VRF device does not have a link-local address and |
1101 | * sending packets to link-local or mcast addresses over | |
1102 | * a VRF device does not make sense | |
1103 | */ | |
1104 | if (fl6->flowi6_oif == dev->ifindex) { | |
1105 | dst = &net->ipv6.ip6_null_entry->dst; | |
1106 | dst_hold(dst); | |
1107 | return dst; | |
35402e31 DA |
1108 | } |
1109 | ||
4c1feac5 DA |
1110 | if (!ipv6_addr_any(&fl6->saddr)) |
1111 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
1112 | ||
1113 | rt = vrf_ip6_route_lookup(net, dev, fl6, fl6->flowi6_oif, flags); | |
1114 | if (rt) | |
1115 | dst = &rt->dst; | |
9ff74384 | 1116 | |
b0e95ccd | 1117 | return dst; |
35402e31 DA |
1118 | } |
1119 | #endif | |
1120 | ||
ee15ee5d DA |
1121 | static const struct l3mdev_ops vrf_l3mdev_ops = { |
1122 | .l3mdev_fib_table = vrf_fib_table, | |
74b20582 | 1123 | .l3mdev_l3_rcv = vrf_l3_rcv, |
ebfc102c | 1124 | .l3mdev_l3_out = vrf_l3_out, |
35402e31 | 1125 | #if IS_ENABLED(CONFIG_IPV6) |
4c1feac5 | 1126 | .l3mdev_link_scope_lookup = vrf_link_scope_lookup, |
35402e31 | 1127 | #endif |
ee15ee5d DA |
1128 | }; |
1129 | ||
193125db DA |
1130 | static void vrf_get_drvinfo(struct net_device *dev, |
1131 | struct ethtool_drvinfo *info) | |
1132 | { | |
1133 | strlcpy(info->driver, DRV_NAME, sizeof(info->driver)); | |
1134 | strlcpy(info->version, DRV_VERSION, sizeof(info->version)); | |
1135 | } | |
1136 | ||
1137 | static const struct ethtool_ops vrf_ethtool_ops = { | |
1138 | .get_drvinfo = vrf_get_drvinfo, | |
1139 | }; | |
1140 | ||
1aa6c4f6 DA |
1141 | static inline size_t vrf_fib_rule_nl_size(void) |
1142 | { | |
1143 | size_t sz; | |
1144 | ||
1145 | sz = NLMSG_ALIGN(sizeof(struct fib_rule_hdr)); | |
1146 | sz += nla_total_size(sizeof(u8)); /* FRA_L3MDEV */ | |
1147 | sz += nla_total_size(sizeof(u32)); /* FRA_PRIORITY */ | |
1148 | ||
1149 | return sz; | |
1150 | } | |
1151 | ||
1152 | static int vrf_fib_rule(const struct net_device *dev, __u8 family, bool add_it) | |
1153 | { | |
1154 | struct fib_rule_hdr *frh; | |
1155 | struct nlmsghdr *nlh; | |
1156 | struct sk_buff *skb; | |
1157 | int err; | |
1158 | ||
e4348637 DA |
1159 | if (family == AF_INET6 && !ipv6_mod_enabled()) |
1160 | return 0; | |
1161 | ||
1aa6c4f6 DA |
1162 | skb = nlmsg_new(vrf_fib_rule_nl_size(), GFP_KERNEL); |
1163 | if (!skb) | |
1164 | return -ENOMEM; | |
1165 | ||
1166 | nlh = nlmsg_put(skb, 0, 0, 0, sizeof(*frh), 0); | |
1167 | if (!nlh) | |
1168 | goto nla_put_failure; | |
1169 | ||
1170 | /* rule only needs to appear once */ | |
426c87ca | 1171 | nlh->nlmsg_flags |= NLM_F_EXCL; |
1aa6c4f6 DA |
1172 | |
1173 | frh = nlmsg_data(nlh); | |
1174 | memset(frh, 0, sizeof(*frh)); | |
1175 | frh->family = family; | |
1176 | frh->action = FR_ACT_TO_TBL; | |
1177 | ||
18129a24 | 1178 | if (nla_put_u8(skb, FRA_L3MDEV, 1)) |
1aa6c4f6 DA |
1179 | goto nla_put_failure; |
1180 | ||
1181 | if (nla_put_u32(skb, FRA_PRIORITY, FIB_RULE_PREF)) | |
1182 | goto nla_put_failure; | |
1183 | ||
1184 | nlmsg_end(skb, nlh); | |
1185 | ||
1186 | /* fib_nl_{new,del}rule handling looks for net from skb->sk */ | |
1187 | skb->sk = dev_net(dev)->rtnl; | |
1188 | if (add_it) { | |
c21ef3e3 | 1189 | err = fib_nl_newrule(skb, nlh, NULL); |
1aa6c4f6 DA |
1190 | if (err == -EEXIST) |
1191 | err = 0; | |
1192 | } else { | |
c21ef3e3 | 1193 | err = fib_nl_delrule(skb, nlh, NULL); |
1aa6c4f6 DA |
1194 | if (err == -ENOENT) |
1195 | err = 0; | |
1196 | } | |
1197 | nlmsg_free(skb); | |
1198 | ||
1199 | return err; | |
1200 | ||
1201 | nla_put_failure: | |
1202 | nlmsg_free(skb); | |
1203 | ||
1204 | return -EMSGSIZE; | |
1205 | } | |
1206 | ||
1207 | static int vrf_add_fib_rules(const struct net_device *dev) | |
1208 | { | |
1209 | int err; | |
1210 | ||
1211 | err = vrf_fib_rule(dev, AF_INET, true); | |
1212 | if (err < 0) | |
1213 | goto out_err; | |
1214 | ||
1215 | err = vrf_fib_rule(dev, AF_INET6, true); | |
1216 | if (err < 0) | |
1217 | goto ipv6_err; | |
1218 | ||
e58e4159 DA |
1219 | #if IS_ENABLED(CONFIG_IP_MROUTE_MULTIPLE_TABLES) |
1220 | err = vrf_fib_rule(dev, RTNL_FAMILY_IPMR, true); | |
1221 | if (err < 0) | |
1222 | goto ipmr_err; | |
1223 | #endif | |
1224 | ||
1aa6c4f6 DA |
1225 | return 0; |
1226 | ||
e58e4159 DA |
1227 | #if IS_ENABLED(CONFIG_IP_MROUTE_MULTIPLE_TABLES) |
1228 | ipmr_err: | |
1229 | vrf_fib_rule(dev, AF_INET6, false); | |
1230 | #endif | |
1231 | ||
1aa6c4f6 DA |
1232 | ipv6_err: |
1233 | vrf_fib_rule(dev, AF_INET, false); | |
1234 | ||
1235 | out_err: | |
1236 | netdev_err(dev, "Failed to add FIB rules.\n"); | |
1237 | return err; | |
1238 | } | |
1239 | ||
193125db DA |
1240 | static void vrf_setup(struct net_device *dev) |
1241 | { | |
1242 | ether_setup(dev); | |
1243 | ||
1244 | /* Initialize the device structure. */ | |
1245 | dev->netdev_ops = &vrf_netdev_ops; | |
ee15ee5d | 1246 | dev->l3mdev_ops = &vrf_l3mdev_ops; |
193125db | 1247 | dev->ethtool_ops = &vrf_ethtool_ops; |
cf124db5 | 1248 | dev->needs_free_netdev = true; |
193125db DA |
1249 | |
1250 | /* Fill in device structure with ethernet-generic values. */ | |
1251 | eth_hw_addr_random(dev); | |
1252 | ||
1253 | /* don't acquire vrf device's netif_tx_lock when transmitting */ | |
1254 | dev->features |= NETIF_F_LLTX; | |
1255 | ||
1256 | /* don't allow vrf devices to change network namespaces. */ | |
1257 | dev->features |= NETIF_F_NETNS_LOCAL; | |
7889681f DA |
1258 | |
1259 | /* does not make sense for a VLAN to be added to a vrf device */ | |
1260 | dev->features |= NETIF_F_VLAN_CHALLENGED; | |
1261 | ||
1262 | /* enable offload features */ | |
1263 | dev->features |= NETIF_F_GSO_SOFTWARE; | |
1264 | dev->features |= NETIF_F_RXCSUM | NETIF_F_HW_CSUM; | |
1265 | dev->features |= NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA; | |
1266 | ||
1267 | dev->hw_features = dev->features; | |
1268 | dev->hw_enc_features = dev->features; | |
1269 | ||
1270 | /* default to no qdisc; user can add if desired */ | |
1271 | dev->priv_flags |= IFF_NO_QUEUE; | |
193125db DA |
1272 | } |
1273 | ||
a8b8a889 MS |
1274 | static int vrf_validate(struct nlattr *tb[], struct nlattr *data[], |
1275 | struct netlink_ext_ack *extack) | |
193125db DA |
1276 | { |
1277 | if (tb[IFLA_ADDRESS]) { | |
53b94835 DA |
1278 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) { |
1279 | NL_SET_ERR_MSG(extack, "Invalid hardware address"); | |
193125db | 1280 | return -EINVAL; |
53b94835 DA |
1281 | } |
1282 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) { | |
1283 | NL_SET_ERR_MSG(extack, "Invalid hardware address"); | |
193125db | 1284 | return -EADDRNOTAVAIL; |
53b94835 | 1285 | } |
193125db DA |
1286 | } |
1287 | return 0; | |
1288 | } | |
1289 | ||
1290 | static void vrf_dellink(struct net_device *dev, struct list_head *head) | |
1291 | { | |
f630c38e NA |
1292 | struct net_device *port_dev; |
1293 | struct list_head *iter; | |
1294 | ||
1295 | netdev_for_each_lower_dev(dev, port_dev, iter) | |
1296 | vrf_del_slave(dev, port_dev); | |
1297 | ||
193125db DA |
1298 | unregister_netdevice_queue(dev, head); |
1299 | } | |
1300 | ||
1301 | static int vrf_newlink(struct net *src_net, struct net_device *dev, | |
7a3f4a18 MS |
1302 | struct nlattr *tb[], struct nlattr *data[], |
1303 | struct netlink_ext_ack *extack) | |
193125db DA |
1304 | { |
1305 | struct net_vrf *vrf = netdev_priv(dev); | |
097d3c95 DA |
1306 | bool *add_fib_rules; |
1307 | struct net *net; | |
1aa6c4f6 | 1308 | int err; |
193125db | 1309 | |
53b94835 DA |
1310 | if (!data || !data[IFLA_VRF_TABLE]) { |
1311 | NL_SET_ERR_MSG(extack, "VRF table id is missing"); | |
193125db | 1312 | return -EINVAL; |
53b94835 | 1313 | } |
193125db DA |
1314 | |
1315 | vrf->tb_id = nla_get_u32(data[IFLA_VRF_TABLE]); | |
53b94835 DA |
1316 | if (vrf->tb_id == RT_TABLE_UNSPEC) { |
1317 | NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VRF_TABLE], | |
1318 | "Invalid VRF table id"); | |
24c63bbc | 1319 | return -EINVAL; |
53b94835 | 1320 | } |
193125db | 1321 | |
007979ea | 1322 | dev->priv_flags |= IFF_L3MDEV_MASTER; |
193125db | 1323 | |
1aa6c4f6 DA |
1324 | err = register_netdevice(dev); |
1325 | if (err) | |
1326 | goto out; | |
1327 | ||
097d3c95 DA |
1328 | net = dev_net(dev); |
1329 | add_fib_rules = net_generic(net, vrf_net_id); | |
1330 | if (*add_fib_rules) { | |
1aa6c4f6 DA |
1331 | err = vrf_add_fib_rules(dev); |
1332 | if (err) { | |
1333 | unregister_netdevice(dev); | |
1334 | goto out; | |
1335 | } | |
097d3c95 | 1336 | *add_fib_rules = false; |
1aa6c4f6 DA |
1337 | } |
1338 | ||
1339 | out: | |
1340 | return err; | |
193125db DA |
1341 | } |
1342 | ||
1343 | static size_t vrf_nl_getsize(const struct net_device *dev) | |
1344 | { | |
1345 | return nla_total_size(sizeof(u32)); /* IFLA_VRF_TABLE */ | |
1346 | } | |
1347 | ||
1348 | static int vrf_fillinfo(struct sk_buff *skb, | |
1349 | const struct net_device *dev) | |
1350 | { | |
1351 | struct net_vrf *vrf = netdev_priv(dev); | |
1352 | ||
1353 | return nla_put_u32(skb, IFLA_VRF_TABLE, vrf->tb_id); | |
1354 | } | |
1355 | ||
67eb0331 DA |
1356 | static size_t vrf_get_slave_size(const struct net_device *bond_dev, |
1357 | const struct net_device *slave_dev) | |
1358 | { | |
1359 | return nla_total_size(sizeof(u32)); /* IFLA_VRF_PORT_TABLE */ | |
1360 | } | |
1361 | ||
1362 | static int vrf_fill_slave_info(struct sk_buff *skb, | |
1363 | const struct net_device *vrf_dev, | |
1364 | const struct net_device *slave_dev) | |
1365 | { | |
1366 | struct net_vrf *vrf = netdev_priv(vrf_dev); | |
1367 | ||
1368 | if (nla_put_u32(skb, IFLA_VRF_PORT_TABLE, vrf->tb_id)) | |
1369 | return -EMSGSIZE; | |
1370 | ||
1371 | return 0; | |
1372 | } | |
1373 | ||
193125db DA |
1374 | static const struct nla_policy vrf_nl_policy[IFLA_VRF_MAX + 1] = { |
1375 | [IFLA_VRF_TABLE] = { .type = NLA_U32 }, | |
1376 | }; | |
1377 | ||
1378 | static struct rtnl_link_ops vrf_link_ops __read_mostly = { | |
1379 | .kind = DRV_NAME, | |
1380 | .priv_size = sizeof(struct net_vrf), | |
1381 | ||
1382 | .get_size = vrf_nl_getsize, | |
1383 | .policy = vrf_nl_policy, | |
1384 | .validate = vrf_validate, | |
1385 | .fill_info = vrf_fillinfo, | |
1386 | ||
67eb0331 DA |
1387 | .get_slave_size = vrf_get_slave_size, |
1388 | .fill_slave_info = vrf_fill_slave_info, | |
1389 | ||
193125db DA |
1390 | .newlink = vrf_newlink, |
1391 | .dellink = vrf_dellink, | |
1392 | .setup = vrf_setup, | |
1393 | .maxtype = IFLA_VRF_MAX, | |
1394 | }; | |
1395 | ||
1396 | static int vrf_device_event(struct notifier_block *unused, | |
1397 | unsigned long event, void *ptr) | |
1398 | { | |
1399 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
1400 | ||
1401 | /* only care about unregister events to drop slave references */ | |
1402 | if (event == NETDEV_UNREGISTER) { | |
193125db DA |
1403 | struct net_device *vrf_dev; |
1404 | ||
fee6d4c7 | 1405 | if (!netif_is_l3_slave(dev)) |
193125db DA |
1406 | goto out; |
1407 | ||
58aa9087 NA |
1408 | vrf_dev = netdev_master_upper_dev_get(dev); |
1409 | vrf_del_slave(vrf_dev, dev); | |
193125db DA |
1410 | } |
1411 | out: | |
1412 | return NOTIFY_DONE; | |
1413 | } | |
1414 | ||
1415 | static struct notifier_block vrf_notifier_block __read_mostly = { | |
1416 | .notifier_call = vrf_device_event, | |
1417 | }; | |
1418 | ||
097d3c95 DA |
1419 | /* Initialize per network namespace state */ |
1420 | static int __net_init vrf_netns_init(struct net *net) | |
1421 | { | |
1422 | bool *add_fib_rules = net_generic(net, vrf_net_id); | |
1423 | ||
1424 | *add_fib_rules = true; | |
1425 | ||
1426 | return 0; | |
1427 | } | |
1428 | ||
1429 | static struct pernet_operations vrf_net_ops __net_initdata = { | |
1430 | .init = vrf_netns_init, | |
1431 | .id = &vrf_net_id, | |
1432 | .size = sizeof(bool), | |
1433 | }; | |
1434 | ||
193125db DA |
1435 | static int __init vrf_init_module(void) |
1436 | { | |
1437 | int rc; | |
1438 | ||
193125db DA |
1439 | register_netdevice_notifier(&vrf_notifier_block); |
1440 | ||
097d3c95 | 1441 | rc = register_pernet_subsys(&vrf_net_ops); |
193125db DA |
1442 | if (rc < 0) |
1443 | goto error; | |
1444 | ||
097d3c95 DA |
1445 | rc = rtnl_link_register(&vrf_link_ops); |
1446 | if (rc < 0) { | |
1447 | unregister_pernet_subsys(&vrf_net_ops); | |
1448 | goto error; | |
1449 | } | |
1450 | ||
193125db DA |
1451 | return 0; |
1452 | ||
1453 | error: | |
1454 | unregister_netdevice_notifier(&vrf_notifier_block); | |
193125db DA |
1455 | return rc; |
1456 | } | |
1457 | ||
193125db | 1458 | module_init(vrf_init_module); |
193125db DA |
1459 | MODULE_AUTHOR("Shrijeet Mukherjee, David Ahern"); |
1460 | MODULE_DESCRIPTION("Device driver to instantiate VRF domains"); | |
1461 | MODULE_LICENSE("GPL"); | |
1462 | MODULE_ALIAS_RTNL_LINK(DRV_NAME); | |
1463 | MODULE_VERSION(DRV_VERSION); |