Commit | Line | Data |
---|---|---|
193125db DA |
1 | /* |
2 | * vrf.c: device driver to encapsulate a VRF space | |
3 | * | |
4 | * Copyright (c) 2015 Cumulus Networks. All rights reserved. | |
5 | * Copyright (c) 2015 Shrijeet Mukherjee <shm@cumulusnetworks.com> | |
6 | * Copyright (c) 2015 David Ahern <dsa@cumulusnetworks.com> | |
7 | * | |
8 | * Based on dummy, team and ipvlan drivers | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | */ | |
15 | ||
16 | #include <linux/module.h> | |
17 | #include <linux/kernel.h> | |
18 | #include <linux/netdevice.h> | |
19 | #include <linux/etherdevice.h> | |
20 | #include <linux/ip.h> | |
21 | #include <linux/init.h> | |
22 | #include <linux/moduleparam.h> | |
23 | #include <linux/netfilter.h> | |
24 | #include <linux/rtnetlink.h> | |
25 | #include <net/rtnetlink.h> | |
26 | #include <linux/u64_stats_sync.h> | |
27 | #include <linux/hashtable.h> | |
28 | ||
29 | #include <linux/inetdevice.h> | |
8f58336d | 30 | #include <net/arp.h> |
193125db DA |
31 | #include <net/ip.h> |
32 | #include <net/ip_fib.h> | |
35402e31 | 33 | #include <net/ip6_fib.h> |
193125db | 34 | #include <net/ip6_route.h> |
193125db DA |
35 | #include <net/route.h> |
36 | #include <net/addrconf.h> | |
ee15ee5d | 37 | #include <net/l3mdev.h> |
1aa6c4f6 | 38 | #include <net/fib_rules.h> |
193125db | 39 | |
8cbb512c DA |
40 | #define RT_FL_TOS(oldflp4) \ |
41 | ((oldflp4)->flowi4_tos & (IPTOS_RT_MASK | RTO_ONLINK)) | |
42 | ||
193125db DA |
43 | #define DRV_NAME "vrf" |
44 | #define DRV_VERSION "1.0" | |
45 | ||
1aa6c4f6 DA |
46 | #define FIB_RULE_PREF 1000 /* default preference for FIB rules */ |
47 | static bool add_fib_rules = true; | |
48 | ||
ec539514 | 49 | struct net_vrf { |
b0e95ccd | 50 | struct rtable __rcu *rth; |
afe80a49 | 51 | struct rtable __rcu *rth_local; |
b0e95ccd | 52 | struct rt6_info __rcu *rt6; |
b4869aa2 | 53 | struct rt6_info __rcu *rt6_local; |
ec539514 DA |
54 | u32 tb_id; |
55 | }; | |
56 | ||
193125db DA |
57 | struct pcpu_dstats { |
58 | u64 tx_pkts; | |
59 | u64 tx_bytes; | |
60 | u64 tx_drps; | |
61 | u64 rx_pkts; | |
62 | u64 rx_bytes; | |
afe80a49 | 63 | u64 rx_drps; |
193125db DA |
64 | struct u64_stats_sync syncp; |
65 | }; | |
66 | ||
afe80a49 DA |
67 | static void vrf_rx_stats(struct net_device *dev, int len) |
68 | { | |
69 | struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats); | |
70 | ||
71 | u64_stats_update_begin(&dstats->syncp); | |
72 | dstats->rx_pkts++; | |
73 | dstats->rx_bytes += len; | |
74 | u64_stats_update_end(&dstats->syncp); | |
75 | } | |
76 | ||
57b8efa1 NA |
77 | static void vrf_tx_error(struct net_device *vrf_dev, struct sk_buff *skb) |
78 | { | |
79 | vrf_dev->stats.tx_errors++; | |
80 | kfree_skb(skb); | |
81 | } | |
82 | ||
193125db DA |
83 | static struct rtnl_link_stats64 *vrf_get_stats64(struct net_device *dev, |
84 | struct rtnl_link_stats64 *stats) | |
85 | { | |
86 | int i; | |
87 | ||
88 | for_each_possible_cpu(i) { | |
89 | const struct pcpu_dstats *dstats; | |
90 | u64 tbytes, tpkts, tdrops, rbytes, rpkts; | |
91 | unsigned int start; | |
92 | ||
93 | dstats = per_cpu_ptr(dev->dstats, i); | |
94 | do { | |
95 | start = u64_stats_fetch_begin_irq(&dstats->syncp); | |
96 | tbytes = dstats->tx_bytes; | |
97 | tpkts = dstats->tx_pkts; | |
98 | tdrops = dstats->tx_drps; | |
99 | rbytes = dstats->rx_bytes; | |
100 | rpkts = dstats->rx_pkts; | |
101 | } while (u64_stats_fetch_retry_irq(&dstats->syncp, start)); | |
102 | stats->tx_bytes += tbytes; | |
103 | stats->tx_packets += tpkts; | |
104 | stats->tx_dropped += tdrops; | |
105 | stats->rx_bytes += rbytes; | |
106 | stats->rx_packets += rpkts; | |
107 | } | |
108 | return stats; | |
109 | } | |
110 | ||
afe80a49 DA |
111 | /* Local traffic destined to local address. Reinsert the packet to rx |
112 | * path, similar to loopback handling. | |
113 | */ | |
114 | static int vrf_local_xmit(struct sk_buff *skb, struct net_device *dev, | |
115 | struct dst_entry *dst) | |
116 | { | |
117 | int len = skb->len; | |
118 | ||
119 | skb_orphan(skb); | |
120 | ||
121 | skb_dst_set(skb, dst); | |
122 | skb_dst_force(skb); | |
123 | ||
124 | /* set pkt_type to avoid skb hitting packet taps twice - | |
125 | * once on Tx and again in Rx processing | |
126 | */ | |
127 | skb->pkt_type = PACKET_LOOPBACK; | |
128 | ||
129 | skb->protocol = eth_type_trans(skb, dev); | |
130 | ||
131 | if (likely(netif_rx(skb) == NET_RX_SUCCESS)) | |
132 | vrf_rx_stats(dev, len); | |
133 | else | |
134 | this_cpu_inc(dev->dstats->rx_drps); | |
135 | ||
136 | return NETDEV_TX_OK; | |
137 | } | |
138 | ||
35402e31 | 139 | #if IS_ENABLED(CONFIG_IPV6) |
4c1feac5 DA |
140 | static int vrf_ip6_local_out(struct net *net, struct sock *sk, |
141 | struct sk_buff *skb) | |
142 | { | |
143 | int err; | |
144 | ||
145 | err = nf_hook(NFPROTO_IPV6, NF_INET_LOCAL_OUT, net, | |
146 | sk, skb, NULL, skb_dst(skb)->dev, dst_output); | |
147 | ||
148 | if (likely(err == 1)) | |
149 | err = dst_output(net, sk, skb); | |
150 | ||
151 | return err; | |
152 | } | |
153 | ||
35402e31 DA |
154 | static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb, |
155 | struct net_device *dev) | |
156 | { | |
157 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
158 | struct net *net = dev_net(skb->dev); | |
159 | struct flowi6 fl6 = { | |
160 | /* needed to match OIF rule */ | |
161 | .flowi6_oif = dev->ifindex, | |
162 | .flowi6_iif = LOOPBACK_IFINDEX, | |
163 | .daddr = iph->daddr, | |
164 | .saddr = iph->saddr, | |
165 | .flowlabel = ip6_flowinfo(iph), | |
166 | .flowi6_mark = skb->mark, | |
167 | .flowi6_proto = iph->nexthdr, | |
168 | .flowi6_flags = FLOWI_FLAG_L3MDEV_SRC | FLOWI_FLAG_SKIP_NH_OIF, | |
169 | }; | |
170 | int ret = NET_XMIT_DROP; | |
171 | struct dst_entry *dst; | |
172 | struct dst_entry *dst_null = &net->ipv6.ip6_null_entry->dst; | |
173 | ||
174 | dst = ip6_route_output(net, NULL, &fl6); | |
175 | if (dst == dst_null) | |
176 | goto err; | |
177 | ||
178 | skb_dst_drop(skb); | |
b4869aa2 DA |
179 | |
180 | /* if dst.dev is loopback or the VRF device again this is locally | |
181 | * originated traffic destined to a local address. Short circuit | |
182 | * to Rx path using our local dst | |
183 | */ | |
184 | if (dst->dev == net->loopback_dev || dst->dev == dev) { | |
185 | struct net_vrf *vrf = netdev_priv(dev); | |
186 | struct rt6_info *rt6_local; | |
187 | ||
188 | /* release looked up dst and use cached local dst */ | |
189 | dst_release(dst); | |
190 | ||
191 | rcu_read_lock(); | |
192 | ||
193 | rt6_local = rcu_dereference(vrf->rt6_local); | |
194 | if (unlikely(!rt6_local)) { | |
195 | rcu_read_unlock(); | |
196 | goto err; | |
197 | } | |
198 | ||
199 | /* Ordering issue: cached local dst is created on newlink | |
200 | * before the IPv6 initialization. Using the local dst | |
201 | * requires rt6i_idev to be set so make sure it is. | |
202 | */ | |
203 | if (unlikely(!rt6_local->rt6i_idev)) { | |
204 | rt6_local->rt6i_idev = in6_dev_get(dev); | |
205 | if (!rt6_local->rt6i_idev) { | |
206 | rcu_read_unlock(); | |
207 | goto err; | |
208 | } | |
209 | } | |
210 | ||
211 | dst = &rt6_local->dst; | |
212 | dst_hold(dst); | |
213 | ||
214 | rcu_read_unlock(); | |
215 | ||
216 | return vrf_local_xmit(skb, dev, &rt6_local->dst); | |
217 | } | |
218 | ||
35402e31 DA |
219 | skb_dst_set(skb, dst); |
220 | ||
911a66fb DA |
221 | /* strip the ethernet header added for pass through VRF device */ |
222 | __skb_pull(skb, skb_network_offset(skb)); | |
223 | ||
4c1feac5 | 224 | ret = vrf_ip6_local_out(net, skb->sk, skb); |
35402e31 DA |
225 | if (unlikely(net_xmit_eval(ret))) |
226 | dev->stats.tx_errors++; | |
227 | else | |
228 | ret = NET_XMIT_SUCCESS; | |
229 | ||
230 | return ret; | |
231 | err: | |
232 | vrf_tx_error(dev, skb); | |
233 | return NET_XMIT_DROP; | |
234 | } | |
235 | #else | |
193125db DA |
236 | static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb, |
237 | struct net_device *dev) | |
238 | { | |
57b8efa1 NA |
239 | vrf_tx_error(dev, skb); |
240 | return NET_XMIT_DROP; | |
193125db | 241 | } |
35402e31 | 242 | #endif |
193125db | 243 | |
ebfc102c DA |
244 | /* based on ip_local_out; can't use it b/c the dst is switched pointing to us */ |
245 | static int vrf_ip_local_out(struct net *net, struct sock *sk, | |
246 | struct sk_buff *skb) | |
247 | { | |
248 | int err; | |
249 | ||
250 | err = nf_hook(NFPROTO_IPV4, NF_INET_LOCAL_OUT, net, sk, | |
251 | skb, NULL, skb_dst(skb)->dev, dst_output); | |
252 | if (likely(err == 1)) | |
253 | err = dst_output(net, sk, skb); | |
254 | ||
255 | return err; | |
256 | } | |
257 | ||
193125db DA |
258 | static netdev_tx_t vrf_process_v4_outbound(struct sk_buff *skb, |
259 | struct net_device *vrf_dev) | |
260 | { | |
261 | struct iphdr *ip4h = ip_hdr(skb); | |
262 | int ret = NET_XMIT_DROP; | |
263 | struct flowi4 fl4 = { | |
264 | /* needed to match OIF rule */ | |
265 | .flowi4_oif = vrf_dev->ifindex, | |
266 | .flowi4_iif = LOOPBACK_IFINDEX, | |
267 | .flowi4_tos = RT_TOS(ip4h->tos), | |
6e2895a8 | 268 | .flowi4_flags = FLOWI_FLAG_ANYSRC | FLOWI_FLAG_L3MDEV_SRC | |
58189ca7 | 269 | FLOWI_FLAG_SKIP_NH_OIF, |
193125db DA |
270 | .daddr = ip4h->daddr, |
271 | }; | |
911a66fb DA |
272 | struct net *net = dev_net(vrf_dev); |
273 | struct rtable *rt; | |
274 | ||
275 | rt = ip_route_output_flow(net, &fl4, NULL); | |
276 | if (IS_ERR(rt)) | |
277 | goto err; | |
193125db | 278 | |
911a66fb DA |
279 | if (rt->rt_type != RTN_UNICAST && rt->rt_type != RTN_LOCAL) { |
280 | ip_rt_put(rt); | |
193125db | 281 | goto err; |
911a66fb DA |
282 | } |
283 | ||
284 | skb_dst_drop(skb); | |
afe80a49 DA |
285 | |
286 | /* if dst.dev is loopback or the VRF device again this is locally | |
287 | * originated traffic destined to a local address. Short circuit | |
288 | * to Rx path using our local dst | |
289 | */ | |
290 | if (rt->dst.dev == net->loopback_dev || rt->dst.dev == vrf_dev) { | |
291 | struct net_vrf *vrf = netdev_priv(vrf_dev); | |
292 | struct rtable *rth_local; | |
293 | struct dst_entry *dst = NULL; | |
294 | ||
295 | ip_rt_put(rt); | |
296 | ||
297 | rcu_read_lock(); | |
298 | ||
299 | rth_local = rcu_dereference(vrf->rth_local); | |
300 | if (likely(rth_local)) { | |
301 | dst = &rth_local->dst; | |
302 | dst_hold(dst); | |
303 | } | |
304 | ||
305 | rcu_read_unlock(); | |
306 | ||
307 | if (unlikely(!dst)) | |
308 | goto err; | |
309 | ||
310 | return vrf_local_xmit(skb, vrf_dev, dst); | |
311 | } | |
312 | ||
911a66fb DA |
313 | skb_dst_set(skb, &rt->dst); |
314 | ||
315 | /* strip the ethernet header added for pass through VRF device */ | |
316 | __skb_pull(skb, skb_network_offset(skb)); | |
193125db DA |
317 | |
318 | if (!ip4h->saddr) { | |
319 | ip4h->saddr = inet_select_addr(skb_dst(skb)->dev, 0, | |
320 | RT_SCOPE_LINK); | |
321 | } | |
322 | ||
ebfc102c | 323 | ret = vrf_ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb); |
193125db DA |
324 | if (unlikely(net_xmit_eval(ret))) |
325 | vrf_dev->stats.tx_errors++; | |
326 | else | |
327 | ret = NET_XMIT_SUCCESS; | |
328 | ||
329 | out: | |
330 | return ret; | |
331 | err: | |
57b8efa1 | 332 | vrf_tx_error(vrf_dev, skb); |
193125db DA |
333 | goto out; |
334 | } | |
335 | ||
336 | static netdev_tx_t is_ip_tx_frame(struct sk_buff *skb, struct net_device *dev) | |
337 | { | |
338 | switch (skb->protocol) { | |
339 | case htons(ETH_P_IP): | |
340 | return vrf_process_v4_outbound(skb, dev); | |
341 | case htons(ETH_P_IPV6): | |
342 | return vrf_process_v6_outbound(skb, dev); | |
343 | default: | |
57b8efa1 | 344 | vrf_tx_error(dev, skb); |
193125db DA |
345 | return NET_XMIT_DROP; |
346 | } | |
347 | } | |
348 | ||
349 | static netdev_tx_t vrf_xmit(struct sk_buff *skb, struct net_device *dev) | |
350 | { | |
351 | netdev_tx_t ret = is_ip_tx_frame(skb, dev); | |
352 | ||
353 | if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { | |
354 | struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats); | |
355 | ||
356 | u64_stats_update_begin(&dstats->syncp); | |
357 | dstats->tx_pkts++; | |
358 | dstats->tx_bytes += skb->len; | |
359 | u64_stats_update_end(&dstats->syncp); | |
360 | } else { | |
361 | this_cpu_inc(dev->dstats->tx_drps); | |
362 | } | |
363 | ||
364 | return ret; | |
365 | } | |
366 | ||
35402e31 | 367 | #if IS_ENABLED(CONFIG_IPV6) |
35402e31 DA |
368 | /* modelled after ip6_finish_output2 */ |
369 | static int vrf_finish_output6(struct net *net, struct sock *sk, | |
370 | struct sk_buff *skb) | |
371 | { | |
372 | struct dst_entry *dst = skb_dst(skb); | |
373 | struct net_device *dev = dst->dev; | |
374 | struct neighbour *neigh; | |
375 | struct in6_addr *nexthop; | |
376 | int ret; | |
377 | ||
378 | skb->protocol = htons(ETH_P_IPV6); | |
379 | skb->dev = dev; | |
380 | ||
381 | rcu_read_lock_bh(); | |
382 | nexthop = rt6_nexthop((struct rt6_info *)dst, &ipv6_hdr(skb)->daddr); | |
383 | neigh = __ipv6_neigh_lookup_noref(dst->dev, nexthop); | |
384 | if (unlikely(!neigh)) | |
385 | neigh = __neigh_create(&nd_tbl, nexthop, dst->dev, false); | |
386 | if (!IS_ERR(neigh)) { | |
387 | ret = dst_neigh_output(dst, neigh, skb); | |
388 | rcu_read_unlock_bh(); | |
389 | return ret; | |
390 | } | |
391 | rcu_read_unlock_bh(); | |
392 | ||
393 | IP6_INC_STATS(dev_net(dst->dev), | |
394 | ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES); | |
395 | kfree_skb(skb); | |
396 | return -EINVAL; | |
397 | } | |
398 | ||
399 | /* modelled after ip6_output */ | |
400 | static int vrf_output6(struct net *net, struct sock *sk, struct sk_buff *skb) | |
401 | { | |
402 | return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING, | |
403 | net, sk, skb, NULL, skb_dst(skb)->dev, | |
404 | vrf_finish_output6, | |
405 | !(IP6CB(skb)->flags & IP6SKB_REROUTED)); | |
406 | } | |
407 | ||
4c1feac5 DA |
408 | /* set dst on skb to send packet to us via dev_xmit path. Allows |
409 | * packet to go through device based features such as qdisc, netfilter | |
410 | * hooks and packet sockets with skb->dev set to vrf device. | |
411 | */ | |
412 | static struct sk_buff *vrf_ip6_out(struct net_device *vrf_dev, | |
413 | struct sock *sk, | |
414 | struct sk_buff *skb) | |
415 | { | |
416 | struct net_vrf *vrf = netdev_priv(vrf_dev); | |
417 | struct dst_entry *dst = NULL; | |
418 | struct rt6_info *rt6; | |
419 | ||
420 | /* don't divert link scope packets */ | |
421 | if (rt6_need_strict(&ipv6_hdr(skb)->daddr)) | |
422 | return skb; | |
423 | ||
424 | rcu_read_lock(); | |
425 | ||
426 | rt6 = rcu_dereference(vrf->rt6); | |
427 | if (likely(rt6)) { | |
428 | dst = &rt6->dst; | |
429 | dst_hold(dst); | |
430 | } | |
431 | ||
432 | rcu_read_unlock(); | |
433 | ||
434 | if (unlikely(!dst)) { | |
435 | vrf_tx_error(vrf_dev, skb); | |
436 | return NULL; | |
437 | } | |
438 | ||
439 | skb_dst_drop(skb); | |
440 | skb_dst_set(skb, dst); | |
441 | ||
442 | return skb; | |
443 | } | |
444 | ||
b0e95ccd | 445 | /* holding rtnl */ |
810e530b | 446 | static void vrf_rt6_release(struct net_device *dev, struct net_vrf *vrf) |
35402e31 | 447 | { |
b0e95ccd | 448 | struct rt6_info *rt6 = rtnl_dereference(vrf->rt6); |
b4869aa2 | 449 | struct rt6_info *rt6_local = rtnl_dereference(vrf->rt6_local); |
810e530b DA |
450 | struct net *net = dev_net(dev); |
451 | struct dst_entry *dst; | |
b0e95ccd | 452 | |
b4869aa2 DA |
453 | RCU_INIT_POINTER(vrf->rt6, NULL); |
454 | RCU_INIT_POINTER(vrf->rt6_local, NULL); | |
455 | synchronize_rcu(); | |
b0e95ccd | 456 | |
810e530b DA |
457 | /* move dev in dst's to loopback so this VRF device can be deleted |
458 | * - based on dst_ifdown | |
459 | */ | |
460 | if (rt6) { | |
461 | dst = &rt6->dst; | |
462 | dev_put(dst->dev); | |
463 | dst->dev = net->loopback_dev; | |
464 | dev_hold(dst->dev); | |
465 | dst_release(dst); | |
466 | } | |
b4869aa2 DA |
467 | |
468 | if (rt6_local) { | |
469 | if (rt6_local->rt6i_idev) | |
470 | in6_dev_put(rt6_local->rt6i_idev); | |
471 | ||
810e530b DA |
472 | dst = &rt6_local->dst; |
473 | dev_put(dst->dev); | |
474 | dst->dev = net->loopback_dev; | |
475 | dev_hold(dst->dev); | |
476 | dst_release(dst); | |
b4869aa2 | 477 | } |
35402e31 DA |
478 | } |
479 | ||
480 | static int vrf_rt6_create(struct net_device *dev) | |
481 | { | |
b4869aa2 | 482 | int flags = DST_HOST | DST_NOPOLICY | DST_NOXFRM | DST_NOCACHE; |
35402e31 | 483 | struct net_vrf *vrf = netdev_priv(dev); |
9ab179d8 | 484 | struct net *net = dev_net(dev); |
b3b4663c | 485 | struct fib6_table *rt6i_table; |
b4869aa2 | 486 | struct rt6_info *rt6, *rt6_local; |
35402e31 DA |
487 | int rc = -ENOMEM; |
488 | ||
e4348637 DA |
489 | /* IPv6 can be CONFIG enabled and then disabled runtime */ |
490 | if (!ipv6_mod_enabled()) | |
491 | return 0; | |
492 | ||
b3b4663c DA |
493 | rt6i_table = fib6_new_table(net, vrf->tb_id); |
494 | if (!rt6i_table) | |
495 | goto out; | |
496 | ||
b4869aa2 DA |
497 | /* create a dst for routing packets out a VRF device */ |
498 | rt6 = ip6_dst_alloc(net, dev, flags); | |
35402e31 DA |
499 | if (!rt6) |
500 | goto out; | |
501 | ||
9ab179d8 | 502 | dst_hold(&rt6->dst); |
b3b4663c DA |
503 | |
504 | rt6->rt6i_table = rt6i_table; | |
505 | rt6->dst.output = vrf_output6; | |
b4869aa2 DA |
506 | |
507 | /* create a dst for local routing - packets sent locally | |
508 | * to local address via the VRF device as a loopback | |
509 | */ | |
510 | rt6_local = ip6_dst_alloc(net, dev, flags); | |
511 | if (!rt6_local) { | |
512 | dst_release(&rt6->dst); | |
513 | goto out; | |
514 | } | |
515 | ||
516 | dst_hold(&rt6_local->dst); | |
517 | ||
518 | rt6_local->rt6i_idev = in6_dev_get(dev); | |
519 | rt6_local->rt6i_flags = RTF_UP | RTF_NONEXTHOP | RTF_LOCAL; | |
520 | rt6_local->rt6i_table = rt6i_table; | |
521 | rt6_local->dst.input = ip6_input; | |
522 | ||
b0e95ccd | 523 | rcu_assign_pointer(vrf->rt6, rt6); |
b4869aa2 | 524 | rcu_assign_pointer(vrf->rt6_local, rt6_local); |
b0e95ccd | 525 | |
35402e31 DA |
526 | rc = 0; |
527 | out: | |
528 | return rc; | |
529 | } | |
530 | #else | |
4c1feac5 DA |
531 | static struct sk_buff *vrf_ip6_out(struct net_device *vrf_dev, |
532 | struct sock *sk, | |
533 | struct sk_buff *skb) | |
534 | { | |
535 | return skb; | |
536 | } | |
537 | ||
810e530b | 538 | static void vrf_rt6_release(struct net_device *dev, struct net_vrf *vrf) |
35402e31 DA |
539 | { |
540 | } | |
541 | ||
542 | static int vrf_rt6_create(struct net_device *dev) | |
543 | { | |
544 | return 0; | |
545 | } | |
546 | #endif | |
547 | ||
8f58336d | 548 | /* modelled after ip_finish_output2 */ |
0c4b51f0 | 549 | static int vrf_finish_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
193125db | 550 | { |
8f58336d DA |
551 | struct dst_entry *dst = skb_dst(skb); |
552 | struct rtable *rt = (struct rtable *)dst; | |
553 | struct net_device *dev = dst->dev; | |
554 | unsigned int hh_len = LL_RESERVED_SPACE(dev); | |
555 | struct neighbour *neigh; | |
556 | u32 nexthop; | |
557 | int ret = -EINVAL; | |
558 | ||
559 | /* Be paranoid, rather than too clever. */ | |
560 | if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) { | |
561 | struct sk_buff *skb2; | |
562 | ||
563 | skb2 = skb_realloc_headroom(skb, LL_RESERVED_SPACE(dev)); | |
564 | if (!skb2) { | |
565 | ret = -ENOMEM; | |
566 | goto err; | |
567 | } | |
568 | if (skb->sk) | |
569 | skb_set_owner_w(skb2, skb->sk); | |
570 | ||
571 | consume_skb(skb); | |
572 | skb = skb2; | |
573 | } | |
574 | ||
575 | rcu_read_lock_bh(); | |
576 | ||
577 | nexthop = (__force u32)rt_nexthop(rt, ip_hdr(skb)->daddr); | |
578 | neigh = __ipv4_neigh_lookup_noref(dev, nexthop); | |
579 | if (unlikely(!neigh)) | |
580 | neigh = __neigh_create(&arp_tbl, &nexthop, dev, false); | |
581 | if (!IS_ERR(neigh)) | |
582 | ret = dst_neigh_output(dst, neigh, skb); | |
583 | ||
584 | rcu_read_unlock_bh(); | |
585 | err: | |
586 | if (unlikely(ret < 0)) | |
587 | vrf_tx_error(skb->dev, skb); | |
588 | return ret; | |
193125db DA |
589 | } |
590 | ||
ede2059d | 591 | static int vrf_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
193125db DA |
592 | { |
593 | struct net_device *dev = skb_dst(skb)->dev; | |
594 | ||
29a26a56 | 595 | IP_UPD_PO_STATS(net, IPSTATS_MIB_OUT, skb->len); |
193125db DA |
596 | |
597 | skb->dev = dev; | |
598 | skb->protocol = htons(ETH_P_IP); | |
599 | ||
29a26a56 EB |
600 | return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING, |
601 | net, sk, skb, NULL, dev, | |
8f58336d | 602 | vrf_finish_output, |
193125db DA |
603 | !(IPCB(skb)->flags & IPSKB_REROUTED)); |
604 | } | |
605 | ||
ebfc102c DA |
606 | /* set dst on skb to send packet to us via dev_xmit path. Allows |
607 | * packet to go through device based features such as qdisc, netfilter | |
608 | * hooks and packet sockets with skb->dev set to vrf device. | |
609 | */ | |
610 | static struct sk_buff *vrf_ip_out(struct net_device *vrf_dev, | |
611 | struct sock *sk, | |
612 | struct sk_buff *skb) | |
613 | { | |
614 | struct net_vrf *vrf = netdev_priv(vrf_dev); | |
615 | struct dst_entry *dst = NULL; | |
616 | struct rtable *rth; | |
617 | ||
618 | rcu_read_lock(); | |
619 | ||
620 | rth = rcu_dereference(vrf->rth); | |
621 | if (likely(rth)) { | |
622 | dst = &rth->dst; | |
623 | dst_hold(dst); | |
624 | } | |
625 | ||
626 | rcu_read_unlock(); | |
627 | ||
628 | if (unlikely(!dst)) { | |
629 | vrf_tx_error(vrf_dev, skb); | |
630 | return NULL; | |
631 | } | |
632 | ||
633 | skb_dst_drop(skb); | |
634 | skb_dst_set(skb, dst); | |
635 | ||
636 | return skb; | |
637 | } | |
638 | ||
639 | /* called with rcu lock held */ | |
640 | static struct sk_buff *vrf_l3_out(struct net_device *vrf_dev, | |
641 | struct sock *sk, | |
642 | struct sk_buff *skb, | |
643 | u16 proto) | |
644 | { | |
645 | switch (proto) { | |
646 | case AF_INET: | |
647 | return vrf_ip_out(vrf_dev, sk, skb); | |
4c1feac5 DA |
648 | case AF_INET6: |
649 | return vrf_ip6_out(vrf_dev, sk, skb); | |
ebfc102c DA |
650 | } |
651 | ||
652 | return skb; | |
653 | } | |
654 | ||
b0e95ccd | 655 | /* holding rtnl */ |
810e530b | 656 | static void vrf_rtable_release(struct net_device *dev, struct net_vrf *vrf) |
193125db | 657 | { |
b0e95ccd | 658 | struct rtable *rth = rtnl_dereference(vrf->rth); |
afe80a49 | 659 | struct rtable *rth_local = rtnl_dereference(vrf->rth_local); |
810e530b DA |
660 | struct net *net = dev_net(dev); |
661 | struct dst_entry *dst; | |
b0e95ccd | 662 | |
afe80a49 DA |
663 | RCU_INIT_POINTER(vrf->rth, NULL); |
664 | RCU_INIT_POINTER(vrf->rth_local, NULL); | |
665 | synchronize_rcu(); | |
193125db | 666 | |
810e530b DA |
667 | /* move dev in dst's to loopback so this VRF device can be deleted |
668 | * - based on dst_ifdown | |
669 | */ | |
670 | if (rth) { | |
671 | dst = &rth->dst; | |
672 | dev_put(dst->dev); | |
673 | dst->dev = net->loopback_dev; | |
674 | dev_hold(dst->dev); | |
675 | dst_release(dst); | |
676 | } | |
afe80a49 | 677 | |
810e530b DA |
678 | if (rth_local) { |
679 | dst = &rth_local->dst; | |
680 | dev_put(dst->dev); | |
681 | dst->dev = net->loopback_dev; | |
682 | dev_hold(dst->dev); | |
683 | dst_release(dst); | |
684 | } | |
193125db DA |
685 | } |
686 | ||
b0e95ccd | 687 | static int vrf_rtable_create(struct net_device *dev) |
193125db | 688 | { |
b7503e0c | 689 | struct net_vrf *vrf = netdev_priv(dev); |
afe80a49 | 690 | struct rtable *rth, *rth_local; |
193125db | 691 | |
b3b4663c | 692 | if (!fib_new_table(dev_net(dev), vrf->tb_id)) |
b0e95ccd | 693 | return -ENOMEM; |
b3b4663c | 694 | |
afe80a49 | 695 | /* create a dst for routing packets out through a VRF device */ |
9ab179d8 | 696 | rth = rt_dst_alloc(dev, 0, RTN_UNICAST, 1, 1, 0); |
b0e95ccd DA |
697 | if (!rth) |
698 | return -ENOMEM; | |
193125db | 699 | |
afe80a49 DA |
700 | /* create a dst for local ingress routing - packets sent locally |
701 | * to local address via the VRF device as a loopback | |
702 | */ | |
703 | rth_local = rt_dst_alloc(dev, RTCF_LOCAL, RTN_LOCAL, 1, 1, 0); | |
704 | if (!rth_local) { | |
705 | dst_release(&rth->dst); | |
706 | return -ENOMEM; | |
707 | } | |
708 | ||
b0e95ccd DA |
709 | rth->dst.output = vrf_output; |
710 | rth->rt_table_id = vrf->tb_id; | |
711 | ||
afe80a49 DA |
712 | rth_local->rt_table_id = vrf->tb_id; |
713 | ||
b0e95ccd | 714 | rcu_assign_pointer(vrf->rth, rth); |
afe80a49 | 715 | rcu_assign_pointer(vrf->rth_local, rth_local); |
b0e95ccd DA |
716 | |
717 | return 0; | |
193125db DA |
718 | } |
719 | ||
720 | /**************************** device handling ********************/ | |
721 | ||
722 | /* cycle interface to flush neighbor cache and move routes across tables */ | |
723 | static void cycle_netdev(struct net_device *dev) | |
724 | { | |
725 | unsigned int flags = dev->flags; | |
726 | int ret; | |
727 | ||
728 | if (!netif_running(dev)) | |
729 | return; | |
730 | ||
731 | ret = dev_change_flags(dev, flags & ~IFF_UP); | |
732 | if (ret >= 0) | |
733 | ret = dev_change_flags(dev, flags); | |
734 | ||
735 | if (ret < 0) { | |
736 | netdev_err(dev, | |
737 | "Failed to cycle device %s; route tables might be wrong!\n", | |
738 | dev->name); | |
739 | } | |
740 | } | |
741 | ||
193125db DA |
742 | static int do_vrf_add_slave(struct net_device *dev, struct net_device *port_dev) |
743 | { | |
bad53162 | 744 | int ret; |
193125db | 745 | |
29bf24af | 746 | ret = netdev_master_upper_dev_link(port_dev, dev, NULL, NULL); |
193125db | 747 | if (ret < 0) |
74b20582 | 748 | return ret; |
193125db | 749 | |
fee6d4c7 | 750 | port_dev->priv_flags |= IFF_L3MDEV_SLAVE; |
193125db DA |
751 | cycle_netdev(port_dev); |
752 | ||
753 | return 0; | |
193125db DA |
754 | } |
755 | ||
756 | static int vrf_add_slave(struct net_device *dev, struct net_device *port_dev) | |
757 | { | |
fee6d4c7 | 758 | if (netif_is_l3_master(port_dev) || netif_is_l3_slave(port_dev)) |
193125db DA |
759 | return -EINVAL; |
760 | ||
761 | return do_vrf_add_slave(dev, port_dev); | |
762 | } | |
763 | ||
764 | /* inverse of do_vrf_add_slave */ | |
765 | static int do_vrf_del_slave(struct net_device *dev, struct net_device *port_dev) | |
766 | { | |
193125db | 767 | netdev_upper_dev_unlink(port_dev, dev); |
fee6d4c7 | 768 | port_dev->priv_flags &= ~IFF_L3MDEV_SLAVE; |
193125db | 769 | |
193125db DA |
770 | cycle_netdev(port_dev); |
771 | ||
193125db DA |
772 | return 0; |
773 | } | |
774 | ||
775 | static int vrf_del_slave(struct net_device *dev, struct net_device *port_dev) | |
776 | { | |
193125db DA |
777 | return do_vrf_del_slave(dev, port_dev); |
778 | } | |
779 | ||
780 | static void vrf_dev_uninit(struct net_device *dev) | |
781 | { | |
782 | struct net_vrf *vrf = netdev_priv(dev); | |
bad53162 NA |
783 | struct net_device *port_dev; |
784 | struct list_head *iter; | |
193125db | 785 | |
810e530b DA |
786 | vrf_rtable_release(dev, vrf); |
787 | vrf_rt6_release(dev, vrf); | |
193125db | 788 | |
bad53162 NA |
789 | netdev_for_each_lower_dev(dev, port_dev, iter) |
790 | vrf_del_slave(dev, port_dev); | |
193125db | 791 | |
3a4a27d3 | 792 | free_percpu(dev->dstats); |
193125db DA |
793 | dev->dstats = NULL; |
794 | } | |
795 | ||
796 | static int vrf_dev_init(struct net_device *dev) | |
797 | { | |
798 | struct net_vrf *vrf = netdev_priv(dev); | |
799 | ||
193125db DA |
800 | dev->dstats = netdev_alloc_pcpu_stats(struct pcpu_dstats); |
801 | if (!dev->dstats) | |
802 | goto out_nomem; | |
803 | ||
804 | /* create the default dst which points back to us */ | |
b0e95ccd | 805 | if (vrf_rtable_create(dev) != 0) |
193125db DA |
806 | goto out_stats; |
807 | ||
35402e31 DA |
808 | if (vrf_rt6_create(dev) != 0) |
809 | goto out_rth; | |
810 | ||
193125db DA |
811 | dev->flags = IFF_MASTER | IFF_NOARP; |
812 | ||
b87ab6b8 DA |
813 | /* MTU is irrelevant for VRF device; set to 64k similar to lo */ |
814 | dev->mtu = 64 * 1024; | |
815 | ||
816 | /* similarly, oper state is irrelevant; set to up to avoid confusion */ | |
817 | dev->operstate = IF_OPER_UP; | |
78e7a2ae | 818 | netdev_lockdep_set_classes(dev); |
193125db DA |
819 | return 0; |
820 | ||
35402e31 | 821 | out_rth: |
810e530b | 822 | vrf_rtable_release(dev, vrf); |
193125db DA |
823 | out_stats: |
824 | free_percpu(dev->dstats); | |
825 | dev->dstats = NULL; | |
826 | out_nomem: | |
827 | return -ENOMEM; | |
828 | } | |
829 | ||
830 | static const struct net_device_ops vrf_netdev_ops = { | |
831 | .ndo_init = vrf_dev_init, | |
832 | .ndo_uninit = vrf_dev_uninit, | |
833 | .ndo_start_xmit = vrf_xmit, | |
834 | .ndo_get_stats64 = vrf_get_stats64, | |
835 | .ndo_add_slave = vrf_add_slave, | |
836 | .ndo_del_slave = vrf_del_slave, | |
837 | }; | |
838 | ||
ee15ee5d DA |
839 | static u32 vrf_fib_table(const struct net_device *dev) |
840 | { | |
841 | struct net_vrf *vrf = netdev_priv(dev); | |
842 | ||
843 | return vrf->tb_id; | |
844 | } | |
845 | ||
846 | static struct rtable *vrf_get_rtable(const struct net_device *dev, | |
847 | const struct flowi4 *fl4) | |
848 | { | |
849 | struct rtable *rth = NULL; | |
850 | ||
6e2895a8 | 851 | if (!(fl4->flowi4_flags & FLOWI_FLAG_L3MDEV_SRC)) { |
ee15ee5d DA |
852 | struct net_vrf *vrf = netdev_priv(dev); |
853 | ||
b0e95ccd DA |
854 | rcu_read_lock(); |
855 | ||
856 | rth = rcu_dereference(vrf->rth); | |
857 | if (likely(rth)) | |
858 | dst_hold(&rth->dst); | |
859 | ||
860 | rcu_read_unlock(); | |
ee15ee5d DA |
861 | } |
862 | ||
863 | return rth; | |
864 | } | |
865 | ||
8cbb512c | 866 | /* called under rcu_read_lock */ |
b5bdacf3 | 867 | static int vrf_get_saddr(struct net_device *dev, struct flowi4 *fl4) |
8cbb512c DA |
868 | { |
869 | struct fib_result res = { .tclassid = 0 }; | |
870 | struct net *net = dev_net(dev); | |
871 | u32 orig_tos = fl4->flowi4_tos; | |
872 | u8 flags = fl4->flowi4_flags; | |
873 | u8 scope = fl4->flowi4_scope; | |
874 | u8 tos = RT_FL_TOS(fl4); | |
b5bdacf3 | 875 | int rc; |
8cbb512c DA |
876 | |
877 | if (unlikely(!fl4->daddr)) | |
b5bdacf3 | 878 | return 0; |
8cbb512c DA |
879 | |
880 | fl4->flowi4_flags |= FLOWI_FLAG_SKIP_NH_OIF; | |
881 | fl4->flowi4_iif = LOOPBACK_IFINDEX; | |
1ff23bee DA |
882 | /* make sure oif is set to VRF device for lookup */ |
883 | fl4->flowi4_oif = dev->ifindex; | |
8cbb512c DA |
884 | fl4->flowi4_tos = tos & IPTOS_RT_MASK; |
885 | fl4->flowi4_scope = ((tos & RTO_ONLINK) ? | |
886 | RT_SCOPE_LINK : RT_SCOPE_UNIVERSE); | |
887 | ||
b5bdacf3 DA |
888 | rc = fib_lookup(net, fl4, &res, 0); |
889 | if (!rc) { | |
8cbb512c DA |
890 | if (res.type == RTN_LOCAL) |
891 | fl4->saddr = res.fi->fib_prefsrc ? : fl4->daddr; | |
892 | else | |
893 | fib_select_path(net, &res, fl4, -1); | |
894 | } | |
895 | ||
896 | fl4->flowi4_flags = flags; | |
897 | fl4->flowi4_tos = orig_tos; | |
898 | fl4->flowi4_scope = scope; | |
b5bdacf3 DA |
899 | |
900 | return rc; | |
8cbb512c DA |
901 | } |
902 | ||
73e20b76 DA |
903 | static int vrf_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb) |
904 | { | |
905 | return 0; | |
906 | } | |
907 | ||
908 | static struct sk_buff *vrf_rcv_nfhook(u8 pf, unsigned int hook, | |
909 | struct sk_buff *skb, | |
910 | struct net_device *dev) | |
911 | { | |
912 | struct net *net = dev_net(dev); | |
913 | ||
914 | nf_reset(skb); | |
915 | ||
916 | if (NF_HOOK(pf, hook, net, NULL, skb, dev, NULL, vrf_rcv_finish) < 0) | |
917 | skb = NULL; /* kfree_skb(skb) handled by nf code */ | |
918 | ||
919 | return skb; | |
920 | } | |
921 | ||
74b20582 DA |
922 | #if IS_ENABLED(CONFIG_IPV6) |
923 | /* neighbor handling is done with actual device; do not want | |
924 | * to flip skb->dev for those ndisc packets. This really fails | |
925 | * for multiple next protocols (e.g., NEXTHDR_HOP). But it is | |
926 | * a start. | |
927 | */ | |
928 | static bool ipv6_ndisc_frame(const struct sk_buff *skb) | |
929 | { | |
930 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
931 | bool rc = false; | |
932 | ||
933 | if (iph->nexthdr == NEXTHDR_ICMP) { | |
934 | const struct icmp6hdr *icmph; | |
935 | struct icmp6hdr _icmph; | |
936 | ||
937 | icmph = skb_header_pointer(skb, sizeof(*iph), | |
938 | sizeof(_icmph), &_icmph); | |
939 | if (!icmph) | |
940 | goto out; | |
941 | ||
942 | switch (icmph->icmp6_type) { | |
943 | case NDISC_ROUTER_SOLICITATION: | |
944 | case NDISC_ROUTER_ADVERTISEMENT: | |
945 | case NDISC_NEIGHBOUR_SOLICITATION: | |
946 | case NDISC_NEIGHBOUR_ADVERTISEMENT: | |
947 | case NDISC_REDIRECT: | |
948 | rc = true; | |
949 | break; | |
950 | } | |
951 | } | |
952 | ||
953 | out: | |
954 | return rc; | |
955 | } | |
956 | ||
9ff74384 DA |
957 | static struct rt6_info *vrf_ip6_route_lookup(struct net *net, |
958 | const struct net_device *dev, | |
959 | struct flowi6 *fl6, | |
960 | int ifindex, | |
961 | int flags) | |
962 | { | |
963 | struct net_vrf *vrf = netdev_priv(dev); | |
964 | struct fib6_table *table = NULL; | |
965 | struct rt6_info *rt6; | |
966 | ||
967 | rcu_read_lock(); | |
968 | ||
969 | /* fib6_table does not have a refcnt and can not be freed */ | |
970 | rt6 = rcu_dereference(vrf->rt6); | |
971 | if (likely(rt6)) | |
972 | table = rt6->rt6i_table; | |
973 | ||
974 | rcu_read_unlock(); | |
975 | ||
976 | if (!table) | |
977 | return NULL; | |
978 | ||
979 | return ip6_pol_route(net, table, ifindex, fl6, flags); | |
980 | } | |
981 | ||
982 | static void vrf_ip6_input_dst(struct sk_buff *skb, struct net_device *vrf_dev, | |
983 | int ifindex) | |
984 | { | |
985 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
986 | struct flowi6 fl6 = { | |
987 | .daddr = iph->daddr, | |
988 | .saddr = iph->saddr, | |
989 | .flowlabel = ip6_flowinfo(iph), | |
990 | .flowi6_mark = skb->mark, | |
991 | .flowi6_proto = iph->nexthdr, | |
992 | .flowi6_iif = ifindex, | |
993 | }; | |
994 | struct net *net = dev_net(vrf_dev); | |
995 | struct rt6_info *rt6; | |
996 | ||
997 | rt6 = vrf_ip6_route_lookup(net, vrf_dev, &fl6, ifindex, | |
998 | RT6_LOOKUP_F_HAS_SADDR | RT6_LOOKUP_F_IFACE); | |
999 | if (unlikely(!rt6)) | |
1000 | return; | |
1001 | ||
1002 | if (unlikely(&rt6->dst == &net->ipv6.ip6_null_entry->dst)) | |
1003 | return; | |
1004 | ||
1005 | skb_dst_set(skb, &rt6->dst); | |
1006 | } | |
1007 | ||
74b20582 DA |
1008 | static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev, |
1009 | struct sk_buff *skb) | |
1010 | { | |
9ff74384 DA |
1011 | int orig_iif = skb->skb_iif; |
1012 | bool need_strict; | |
1013 | ||
b4869aa2 DA |
1014 | /* loopback traffic; do not push through packet taps again. |
1015 | * Reset pkt_type for upper layers to process skb | |
1016 | */ | |
1017 | if (skb->pkt_type == PACKET_LOOPBACK) { | |
1018 | skb->dev = vrf_dev; | |
1019 | skb->skb_iif = vrf_dev->ifindex; | |
1020 | skb->pkt_type = PACKET_HOST; | |
1021 | goto out; | |
1022 | } | |
1023 | ||
9ff74384 DA |
1024 | /* if packet is NDISC or addressed to multicast or link-local |
1025 | * then keep the ingress interface | |
1026 | */ | |
1027 | need_strict = rt6_need_strict(&ipv6_hdr(skb)->daddr); | |
1028 | if (!ipv6_ndisc_frame(skb) && !need_strict) { | |
74b20582 DA |
1029 | skb->dev = vrf_dev; |
1030 | skb->skb_iif = vrf_dev->ifindex; | |
1031 | ||
1032 | skb_push(skb, skb->mac_len); | |
1033 | dev_queue_xmit_nit(skb, vrf_dev); | |
1034 | skb_pull(skb, skb->mac_len); | |
1035 | ||
1036 | IP6CB(skb)->flags |= IP6SKB_L3SLAVE; | |
1037 | } | |
1038 | ||
9ff74384 DA |
1039 | if (need_strict) |
1040 | vrf_ip6_input_dst(skb, vrf_dev, orig_iif); | |
1041 | ||
73e20b76 | 1042 | skb = vrf_rcv_nfhook(NFPROTO_IPV6, NF_INET_PRE_ROUTING, skb, vrf_dev); |
b4869aa2 | 1043 | out: |
74b20582 DA |
1044 | return skb; |
1045 | } | |
1046 | ||
1047 | #else | |
1048 | static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev, | |
1049 | struct sk_buff *skb) | |
1050 | { | |
1051 | return skb; | |
1052 | } | |
1053 | #endif | |
1054 | ||
1055 | static struct sk_buff *vrf_ip_rcv(struct net_device *vrf_dev, | |
1056 | struct sk_buff *skb) | |
1057 | { | |
1058 | skb->dev = vrf_dev; | |
1059 | skb->skb_iif = vrf_dev->ifindex; | |
1060 | ||
afe80a49 DA |
1061 | /* loopback traffic; do not push through packet taps again. |
1062 | * Reset pkt_type for upper layers to process skb | |
1063 | */ | |
1064 | if (skb->pkt_type == PACKET_LOOPBACK) { | |
1065 | skb->pkt_type = PACKET_HOST; | |
1066 | goto out; | |
1067 | } | |
1068 | ||
74b20582 DA |
1069 | skb_push(skb, skb->mac_len); |
1070 | dev_queue_xmit_nit(skb, vrf_dev); | |
1071 | skb_pull(skb, skb->mac_len); | |
1072 | ||
73e20b76 | 1073 | skb = vrf_rcv_nfhook(NFPROTO_IPV4, NF_INET_PRE_ROUTING, skb, vrf_dev); |
afe80a49 | 1074 | out: |
74b20582 DA |
1075 | return skb; |
1076 | } | |
1077 | ||
1078 | /* called with rcu lock held */ | |
1079 | static struct sk_buff *vrf_l3_rcv(struct net_device *vrf_dev, | |
1080 | struct sk_buff *skb, | |
1081 | u16 proto) | |
1082 | { | |
1083 | switch (proto) { | |
1084 | case AF_INET: | |
1085 | return vrf_ip_rcv(vrf_dev, skb); | |
1086 | case AF_INET6: | |
1087 | return vrf_ip6_rcv(vrf_dev, skb); | |
1088 | } | |
1089 | ||
1090 | return skb; | |
1091 | } | |
1092 | ||
35402e31 | 1093 | #if IS_ENABLED(CONFIG_IPV6) |
4c1feac5 DA |
1094 | /* send to link-local or multicast address via interface enslaved to |
1095 | * VRF device. Force lookup to VRF table without changing flow struct | |
1096 | */ | |
1097 | static struct dst_entry *vrf_link_scope_lookup(const struct net_device *dev, | |
1098 | struct flowi6 *fl6) | |
35402e31 | 1099 | { |
9ff74384 | 1100 | struct net *net = dev_net(dev); |
4c1feac5 | 1101 | int flags = RT6_LOOKUP_F_IFACE; |
b0e95ccd | 1102 | struct dst_entry *dst = NULL; |
9ff74384 | 1103 | struct rt6_info *rt; |
35402e31 | 1104 | |
4c1feac5 DA |
1105 | /* VRF device does not have a link-local address and |
1106 | * sending packets to link-local or mcast addresses over | |
1107 | * a VRF device does not make sense | |
1108 | */ | |
1109 | if (fl6->flowi6_oif == dev->ifindex) { | |
1110 | dst = &net->ipv6.ip6_null_entry->dst; | |
1111 | dst_hold(dst); | |
1112 | return dst; | |
35402e31 DA |
1113 | } |
1114 | ||
4c1feac5 DA |
1115 | if (!ipv6_addr_any(&fl6->saddr)) |
1116 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
1117 | ||
1118 | rt = vrf_ip6_route_lookup(net, dev, fl6, fl6->flowi6_oif, flags); | |
1119 | if (rt) | |
1120 | dst = &rt->dst; | |
9ff74384 | 1121 | |
b0e95ccd | 1122 | return dst; |
35402e31 | 1123 | } |
0d240e78 DA |
1124 | |
1125 | /* called under rcu_read_lock */ | |
1126 | static int vrf_get_saddr6(struct net_device *dev, const struct sock *sk, | |
1127 | struct flowi6 *fl6) | |
1128 | { | |
1129 | struct net *net = dev_net(dev); | |
1130 | struct dst_entry *dst; | |
1131 | struct rt6_info *rt; | |
1132 | int err; | |
1133 | ||
1134 | if (rt6_need_strict(&fl6->daddr)) { | |
1135 | rt = vrf_ip6_route_lookup(net, dev, fl6, fl6->flowi6_oif, | |
1136 | RT6_LOOKUP_F_IFACE); | |
1137 | if (unlikely(!rt)) | |
1138 | return 0; | |
1139 | ||
1140 | dst = &rt->dst; | |
1141 | } else { | |
1142 | __u8 flags = fl6->flowi6_flags; | |
1143 | ||
1144 | fl6->flowi6_flags |= FLOWI_FLAG_L3MDEV_SRC; | |
1145 | fl6->flowi6_flags |= FLOWI_FLAG_SKIP_NH_OIF; | |
1146 | ||
1147 | dst = ip6_route_output(net, sk, fl6); | |
1148 | rt = (struct rt6_info *)dst; | |
1149 | ||
1150 | fl6->flowi6_flags = flags; | |
1151 | } | |
1152 | ||
1153 | err = dst->error; | |
1154 | if (!err) { | |
1155 | err = ip6_route_get_saddr(net, rt, &fl6->daddr, | |
1156 | sk ? inet6_sk(sk)->srcprefs : 0, | |
1157 | &fl6->saddr); | |
1158 | } | |
1159 | ||
1160 | dst_release(dst); | |
1161 | ||
1162 | return err; | |
1163 | } | |
35402e31 DA |
1164 | #endif |
1165 | ||
ee15ee5d DA |
1166 | static const struct l3mdev_ops vrf_l3mdev_ops = { |
1167 | .l3mdev_fib_table = vrf_fib_table, | |
1168 | .l3mdev_get_rtable = vrf_get_rtable, | |
8cbb512c | 1169 | .l3mdev_get_saddr = vrf_get_saddr, |
74b20582 | 1170 | .l3mdev_l3_rcv = vrf_l3_rcv, |
ebfc102c | 1171 | .l3mdev_l3_out = vrf_l3_out, |
35402e31 | 1172 | #if IS_ENABLED(CONFIG_IPV6) |
4c1feac5 | 1173 | .l3mdev_link_scope_lookup = vrf_link_scope_lookup, |
0d240e78 | 1174 | .l3mdev_get_saddr6 = vrf_get_saddr6, |
35402e31 | 1175 | #endif |
ee15ee5d DA |
1176 | }; |
1177 | ||
193125db DA |
1178 | static void vrf_get_drvinfo(struct net_device *dev, |
1179 | struct ethtool_drvinfo *info) | |
1180 | { | |
1181 | strlcpy(info->driver, DRV_NAME, sizeof(info->driver)); | |
1182 | strlcpy(info->version, DRV_VERSION, sizeof(info->version)); | |
1183 | } | |
1184 | ||
1185 | static const struct ethtool_ops vrf_ethtool_ops = { | |
1186 | .get_drvinfo = vrf_get_drvinfo, | |
1187 | }; | |
1188 | ||
1aa6c4f6 DA |
1189 | static inline size_t vrf_fib_rule_nl_size(void) |
1190 | { | |
1191 | size_t sz; | |
1192 | ||
1193 | sz = NLMSG_ALIGN(sizeof(struct fib_rule_hdr)); | |
1194 | sz += nla_total_size(sizeof(u8)); /* FRA_L3MDEV */ | |
1195 | sz += nla_total_size(sizeof(u32)); /* FRA_PRIORITY */ | |
1196 | ||
1197 | return sz; | |
1198 | } | |
1199 | ||
1200 | static int vrf_fib_rule(const struct net_device *dev, __u8 family, bool add_it) | |
1201 | { | |
1202 | struct fib_rule_hdr *frh; | |
1203 | struct nlmsghdr *nlh; | |
1204 | struct sk_buff *skb; | |
1205 | int err; | |
1206 | ||
e4348637 DA |
1207 | if (family == AF_INET6 && !ipv6_mod_enabled()) |
1208 | return 0; | |
1209 | ||
1aa6c4f6 DA |
1210 | skb = nlmsg_new(vrf_fib_rule_nl_size(), GFP_KERNEL); |
1211 | if (!skb) | |
1212 | return -ENOMEM; | |
1213 | ||
1214 | nlh = nlmsg_put(skb, 0, 0, 0, sizeof(*frh), 0); | |
1215 | if (!nlh) | |
1216 | goto nla_put_failure; | |
1217 | ||
1218 | /* rule only needs to appear once */ | |
1219 | nlh->nlmsg_flags &= NLM_F_EXCL; | |
1220 | ||
1221 | frh = nlmsg_data(nlh); | |
1222 | memset(frh, 0, sizeof(*frh)); | |
1223 | frh->family = family; | |
1224 | frh->action = FR_ACT_TO_TBL; | |
1225 | ||
1226 | if (nla_put_u32(skb, FRA_L3MDEV, 1)) | |
1227 | goto nla_put_failure; | |
1228 | ||
1229 | if (nla_put_u32(skb, FRA_PRIORITY, FIB_RULE_PREF)) | |
1230 | goto nla_put_failure; | |
1231 | ||
1232 | nlmsg_end(skb, nlh); | |
1233 | ||
1234 | /* fib_nl_{new,del}rule handling looks for net from skb->sk */ | |
1235 | skb->sk = dev_net(dev)->rtnl; | |
1236 | if (add_it) { | |
1237 | err = fib_nl_newrule(skb, nlh); | |
1238 | if (err == -EEXIST) | |
1239 | err = 0; | |
1240 | } else { | |
1241 | err = fib_nl_delrule(skb, nlh); | |
1242 | if (err == -ENOENT) | |
1243 | err = 0; | |
1244 | } | |
1245 | nlmsg_free(skb); | |
1246 | ||
1247 | return err; | |
1248 | ||
1249 | nla_put_failure: | |
1250 | nlmsg_free(skb); | |
1251 | ||
1252 | return -EMSGSIZE; | |
1253 | } | |
1254 | ||
1255 | static int vrf_add_fib_rules(const struct net_device *dev) | |
1256 | { | |
1257 | int err; | |
1258 | ||
1259 | err = vrf_fib_rule(dev, AF_INET, true); | |
1260 | if (err < 0) | |
1261 | goto out_err; | |
1262 | ||
1263 | err = vrf_fib_rule(dev, AF_INET6, true); | |
1264 | if (err < 0) | |
1265 | goto ipv6_err; | |
1266 | ||
1267 | return 0; | |
1268 | ||
1269 | ipv6_err: | |
1270 | vrf_fib_rule(dev, AF_INET, false); | |
1271 | ||
1272 | out_err: | |
1273 | netdev_err(dev, "Failed to add FIB rules.\n"); | |
1274 | return err; | |
1275 | } | |
1276 | ||
193125db DA |
1277 | static void vrf_setup(struct net_device *dev) |
1278 | { | |
1279 | ether_setup(dev); | |
1280 | ||
1281 | /* Initialize the device structure. */ | |
1282 | dev->netdev_ops = &vrf_netdev_ops; | |
ee15ee5d | 1283 | dev->l3mdev_ops = &vrf_l3mdev_ops; |
193125db DA |
1284 | dev->ethtool_ops = &vrf_ethtool_ops; |
1285 | dev->destructor = free_netdev; | |
1286 | ||
1287 | /* Fill in device structure with ethernet-generic values. */ | |
1288 | eth_hw_addr_random(dev); | |
1289 | ||
1290 | /* don't acquire vrf device's netif_tx_lock when transmitting */ | |
1291 | dev->features |= NETIF_F_LLTX; | |
1292 | ||
1293 | /* don't allow vrf devices to change network namespaces. */ | |
1294 | dev->features |= NETIF_F_NETNS_LOCAL; | |
7889681f DA |
1295 | |
1296 | /* does not make sense for a VLAN to be added to a vrf device */ | |
1297 | dev->features |= NETIF_F_VLAN_CHALLENGED; | |
1298 | ||
1299 | /* enable offload features */ | |
1300 | dev->features |= NETIF_F_GSO_SOFTWARE; | |
1301 | dev->features |= NETIF_F_RXCSUM | NETIF_F_HW_CSUM; | |
1302 | dev->features |= NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA; | |
1303 | ||
1304 | dev->hw_features = dev->features; | |
1305 | dev->hw_enc_features = dev->features; | |
1306 | ||
1307 | /* default to no qdisc; user can add if desired */ | |
1308 | dev->priv_flags |= IFF_NO_QUEUE; | |
193125db DA |
1309 | } |
1310 | ||
1311 | static int vrf_validate(struct nlattr *tb[], struct nlattr *data[]) | |
1312 | { | |
1313 | if (tb[IFLA_ADDRESS]) { | |
1314 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) | |
1315 | return -EINVAL; | |
1316 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) | |
1317 | return -EADDRNOTAVAIL; | |
1318 | } | |
1319 | return 0; | |
1320 | } | |
1321 | ||
1322 | static void vrf_dellink(struct net_device *dev, struct list_head *head) | |
1323 | { | |
193125db DA |
1324 | unregister_netdevice_queue(dev, head); |
1325 | } | |
1326 | ||
1327 | static int vrf_newlink(struct net *src_net, struct net_device *dev, | |
1328 | struct nlattr *tb[], struct nlattr *data[]) | |
1329 | { | |
1330 | struct net_vrf *vrf = netdev_priv(dev); | |
1aa6c4f6 | 1331 | int err; |
193125db DA |
1332 | |
1333 | if (!data || !data[IFLA_VRF_TABLE]) | |
1334 | return -EINVAL; | |
1335 | ||
1336 | vrf->tb_id = nla_get_u32(data[IFLA_VRF_TABLE]); | |
1337 | ||
007979ea | 1338 | dev->priv_flags |= IFF_L3MDEV_MASTER; |
193125db | 1339 | |
1aa6c4f6 DA |
1340 | err = register_netdevice(dev); |
1341 | if (err) | |
1342 | goto out; | |
1343 | ||
1344 | if (add_fib_rules) { | |
1345 | err = vrf_add_fib_rules(dev); | |
1346 | if (err) { | |
1347 | unregister_netdevice(dev); | |
1348 | goto out; | |
1349 | } | |
1350 | add_fib_rules = false; | |
1351 | } | |
1352 | ||
1353 | out: | |
1354 | return err; | |
193125db DA |
1355 | } |
1356 | ||
1357 | static size_t vrf_nl_getsize(const struct net_device *dev) | |
1358 | { | |
1359 | return nla_total_size(sizeof(u32)); /* IFLA_VRF_TABLE */ | |
1360 | } | |
1361 | ||
1362 | static int vrf_fillinfo(struct sk_buff *skb, | |
1363 | const struct net_device *dev) | |
1364 | { | |
1365 | struct net_vrf *vrf = netdev_priv(dev); | |
1366 | ||
1367 | return nla_put_u32(skb, IFLA_VRF_TABLE, vrf->tb_id); | |
1368 | } | |
1369 | ||
67eb0331 DA |
1370 | static size_t vrf_get_slave_size(const struct net_device *bond_dev, |
1371 | const struct net_device *slave_dev) | |
1372 | { | |
1373 | return nla_total_size(sizeof(u32)); /* IFLA_VRF_PORT_TABLE */ | |
1374 | } | |
1375 | ||
1376 | static int vrf_fill_slave_info(struct sk_buff *skb, | |
1377 | const struct net_device *vrf_dev, | |
1378 | const struct net_device *slave_dev) | |
1379 | { | |
1380 | struct net_vrf *vrf = netdev_priv(vrf_dev); | |
1381 | ||
1382 | if (nla_put_u32(skb, IFLA_VRF_PORT_TABLE, vrf->tb_id)) | |
1383 | return -EMSGSIZE; | |
1384 | ||
1385 | return 0; | |
1386 | } | |
1387 | ||
193125db DA |
1388 | static const struct nla_policy vrf_nl_policy[IFLA_VRF_MAX + 1] = { |
1389 | [IFLA_VRF_TABLE] = { .type = NLA_U32 }, | |
1390 | }; | |
1391 | ||
1392 | static struct rtnl_link_ops vrf_link_ops __read_mostly = { | |
1393 | .kind = DRV_NAME, | |
1394 | .priv_size = sizeof(struct net_vrf), | |
1395 | ||
1396 | .get_size = vrf_nl_getsize, | |
1397 | .policy = vrf_nl_policy, | |
1398 | .validate = vrf_validate, | |
1399 | .fill_info = vrf_fillinfo, | |
1400 | ||
67eb0331 DA |
1401 | .get_slave_size = vrf_get_slave_size, |
1402 | .fill_slave_info = vrf_fill_slave_info, | |
1403 | ||
193125db DA |
1404 | .newlink = vrf_newlink, |
1405 | .dellink = vrf_dellink, | |
1406 | .setup = vrf_setup, | |
1407 | .maxtype = IFLA_VRF_MAX, | |
1408 | }; | |
1409 | ||
1410 | static int vrf_device_event(struct notifier_block *unused, | |
1411 | unsigned long event, void *ptr) | |
1412 | { | |
1413 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
1414 | ||
1415 | /* only care about unregister events to drop slave references */ | |
1416 | if (event == NETDEV_UNREGISTER) { | |
193125db DA |
1417 | struct net_device *vrf_dev; |
1418 | ||
fee6d4c7 | 1419 | if (!netif_is_l3_slave(dev)) |
193125db DA |
1420 | goto out; |
1421 | ||
58aa9087 NA |
1422 | vrf_dev = netdev_master_upper_dev_get(dev); |
1423 | vrf_del_slave(vrf_dev, dev); | |
193125db DA |
1424 | } |
1425 | out: | |
1426 | return NOTIFY_DONE; | |
1427 | } | |
1428 | ||
1429 | static struct notifier_block vrf_notifier_block __read_mostly = { | |
1430 | .notifier_call = vrf_device_event, | |
1431 | }; | |
1432 | ||
1433 | static int __init vrf_init_module(void) | |
1434 | { | |
1435 | int rc; | |
1436 | ||
193125db DA |
1437 | register_netdevice_notifier(&vrf_notifier_block); |
1438 | ||
1439 | rc = rtnl_link_register(&vrf_link_ops); | |
1440 | if (rc < 0) | |
1441 | goto error; | |
1442 | ||
1443 | return 0; | |
1444 | ||
1445 | error: | |
1446 | unregister_netdevice_notifier(&vrf_notifier_block); | |
193125db DA |
1447 | return rc; |
1448 | } | |
1449 | ||
193125db | 1450 | module_init(vrf_init_module); |
193125db DA |
1451 | MODULE_AUTHOR("Shrijeet Mukherjee, David Ahern"); |
1452 | MODULE_DESCRIPTION("Device driver to instantiate VRF domains"); | |
1453 | MODULE_LICENSE("GPL"); | |
1454 | MODULE_ALIAS_RTNL_LINK(DRV_NAME); | |
1455 | MODULE_VERSION(DRV_VERSION); |