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