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Commit | Line | Data |
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193125db DA |
1 | /* |
2 | * vrf.c: device driver to encapsulate a VRF space | |
3 | * | |
4 | * Copyright (c) 2015 Cumulus Networks. All rights reserved. | |
5 | * Copyright (c) 2015 Shrijeet Mukherjee <shm@cumulusnetworks.com> | |
6 | * Copyright (c) 2015 David Ahern <dsa@cumulusnetworks.com> | |
7 | * | |
8 | * Based on dummy, team and ipvlan drivers | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | */ | |
15 | ||
16 | #include <linux/module.h> | |
17 | #include <linux/kernel.h> | |
18 | #include <linux/netdevice.h> | |
19 | #include <linux/etherdevice.h> | |
20 | #include <linux/ip.h> | |
21 | #include <linux/init.h> | |
22 | #include <linux/moduleparam.h> | |
23 | #include <linux/netfilter.h> | |
24 | #include <linux/rtnetlink.h> | |
25 | #include <net/rtnetlink.h> | |
26 | #include <linux/u64_stats_sync.h> | |
27 | #include <linux/hashtable.h> | |
28 | ||
29 | #include <linux/inetdevice.h> | |
8f58336d | 30 | #include <net/arp.h> |
193125db DA |
31 | #include <net/ip.h> |
32 | #include <net/ip_fib.h> | |
35402e31 | 33 | #include <net/ip6_fib.h> |
193125db | 34 | #include <net/ip6_route.h> |
193125db DA |
35 | #include <net/route.h> |
36 | #include <net/addrconf.h> | |
ee15ee5d | 37 | #include <net/l3mdev.h> |
1aa6c4f6 | 38 | #include <net/fib_rules.h> |
193125db | 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 DA |
139 | #if IS_ENABLED(CONFIG_IPV6) |
140 | static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb, | |
141 | struct net_device *dev) | |
142 | { | |
143 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
144 | struct net *net = dev_net(skb->dev); | |
145 | struct flowi6 fl6 = { | |
146 | /* needed to match OIF rule */ | |
147 | .flowi6_oif = dev->ifindex, | |
148 | .flowi6_iif = LOOPBACK_IFINDEX, | |
149 | .daddr = iph->daddr, | |
150 | .saddr = iph->saddr, | |
151 | .flowlabel = ip6_flowinfo(iph), | |
152 | .flowi6_mark = skb->mark, | |
153 | .flowi6_proto = iph->nexthdr, | |
154 | .flowi6_flags = FLOWI_FLAG_L3MDEV_SRC | FLOWI_FLAG_SKIP_NH_OIF, | |
155 | }; | |
156 | int ret = NET_XMIT_DROP; | |
157 | struct dst_entry *dst; | |
158 | struct dst_entry *dst_null = &net->ipv6.ip6_null_entry->dst; | |
159 | ||
160 | dst = ip6_route_output(net, NULL, &fl6); | |
161 | if (dst == dst_null) | |
162 | goto err; | |
163 | ||
164 | skb_dst_drop(skb); | |
b4869aa2 DA |
165 | |
166 | /* if dst.dev is loopback or the VRF device again this is locally | |
167 | * originated traffic destined to a local address. Short circuit | |
168 | * to Rx path using our local dst | |
169 | */ | |
170 | if (dst->dev == net->loopback_dev || dst->dev == dev) { | |
171 | struct net_vrf *vrf = netdev_priv(dev); | |
172 | struct rt6_info *rt6_local; | |
173 | ||
174 | /* release looked up dst and use cached local dst */ | |
175 | dst_release(dst); | |
176 | ||
177 | rcu_read_lock(); | |
178 | ||
179 | rt6_local = rcu_dereference(vrf->rt6_local); | |
180 | if (unlikely(!rt6_local)) { | |
181 | rcu_read_unlock(); | |
182 | goto err; | |
183 | } | |
184 | ||
185 | /* Ordering issue: cached local dst is created on newlink | |
186 | * before the IPv6 initialization. Using the local dst | |
187 | * requires rt6i_idev to be set so make sure it is. | |
188 | */ | |
189 | if (unlikely(!rt6_local->rt6i_idev)) { | |
190 | rt6_local->rt6i_idev = in6_dev_get(dev); | |
191 | if (!rt6_local->rt6i_idev) { | |
192 | rcu_read_unlock(); | |
193 | goto err; | |
194 | } | |
195 | } | |
196 | ||
197 | dst = &rt6_local->dst; | |
198 | dst_hold(dst); | |
199 | ||
200 | rcu_read_unlock(); | |
201 | ||
202 | return vrf_local_xmit(skb, dev, &rt6_local->dst); | |
203 | } | |
204 | ||
35402e31 DA |
205 | skb_dst_set(skb, dst); |
206 | ||
911a66fb DA |
207 | /* strip the ethernet header added for pass through VRF device */ |
208 | __skb_pull(skb, skb_network_offset(skb)); | |
209 | ||
35402e31 DA |
210 | ret = ip6_local_out(net, skb->sk, skb); |
211 | if (unlikely(net_xmit_eval(ret))) | |
212 | dev->stats.tx_errors++; | |
213 | else | |
214 | ret = NET_XMIT_SUCCESS; | |
215 | ||
216 | return ret; | |
217 | err: | |
218 | vrf_tx_error(dev, skb); | |
219 | return NET_XMIT_DROP; | |
220 | } | |
221 | #else | |
193125db DA |
222 | static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb, |
223 | struct net_device *dev) | |
224 | { | |
57b8efa1 NA |
225 | vrf_tx_error(dev, skb); |
226 | return NET_XMIT_DROP; | |
193125db | 227 | } |
35402e31 | 228 | #endif |
193125db | 229 | |
ebfc102c DA |
230 | /* based on ip_local_out; can't use it b/c the dst is switched pointing to us */ |
231 | static int vrf_ip_local_out(struct net *net, struct sock *sk, | |
232 | struct sk_buff *skb) | |
233 | { | |
234 | int err; | |
235 | ||
236 | err = nf_hook(NFPROTO_IPV4, NF_INET_LOCAL_OUT, net, sk, | |
237 | skb, NULL, skb_dst(skb)->dev, dst_output); | |
238 | if (likely(err == 1)) | |
239 | err = dst_output(net, sk, skb); | |
240 | ||
241 | return err; | |
242 | } | |
243 | ||
193125db DA |
244 | static netdev_tx_t vrf_process_v4_outbound(struct sk_buff *skb, |
245 | struct net_device *vrf_dev) | |
246 | { | |
247 | struct iphdr *ip4h = ip_hdr(skb); | |
248 | int ret = NET_XMIT_DROP; | |
249 | struct flowi4 fl4 = { | |
250 | /* needed to match OIF rule */ | |
251 | .flowi4_oif = vrf_dev->ifindex, | |
252 | .flowi4_iif = LOOPBACK_IFINDEX, | |
253 | .flowi4_tos = RT_TOS(ip4h->tos), | |
6e2895a8 | 254 | .flowi4_flags = FLOWI_FLAG_ANYSRC | FLOWI_FLAG_L3MDEV_SRC | |
58189ca7 | 255 | FLOWI_FLAG_SKIP_NH_OIF, |
193125db DA |
256 | .daddr = ip4h->daddr, |
257 | }; | |
911a66fb DA |
258 | struct net *net = dev_net(vrf_dev); |
259 | struct rtable *rt; | |
260 | ||
261 | rt = ip_route_output_flow(net, &fl4, NULL); | |
262 | if (IS_ERR(rt)) | |
263 | goto err; | |
193125db | 264 | |
911a66fb DA |
265 | if (rt->rt_type != RTN_UNICAST && rt->rt_type != RTN_LOCAL) { |
266 | ip_rt_put(rt); | |
193125db | 267 | goto err; |
911a66fb DA |
268 | } |
269 | ||
270 | skb_dst_drop(skb); | |
afe80a49 DA |
271 | |
272 | /* if dst.dev is loopback or the VRF device again this is locally | |
273 | * originated traffic destined to a local address. Short circuit | |
274 | * to Rx path using our local dst | |
275 | */ | |
276 | if (rt->dst.dev == net->loopback_dev || rt->dst.dev == vrf_dev) { | |
277 | struct net_vrf *vrf = netdev_priv(vrf_dev); | |
278 | struct rtable *rth_local; | |
279 | struct dst_entry *dst = NULL; | |
280 | ||
281 | ip_rt_put(rt); | |
282 | ||
283 | rcu_read_lock(); | |
284 | ||
285 | rth_local = rcu_dereference(vrf->rth_local); | |
286 | if (likely(rth_local)) { | |
287 | dst = &rth_local->dst; | |
288 | dst_hold(dst); | |
289 | } | |
290 | ||
291 | rcu_read_unlock(); | |
292 | ||
293 | if (unlikely(!dst)) | |
294 | goto err; | |
295 | ||
296 | return vrf_local_xmit(skb, vrf_dev, dst); | |
297 | } | |
298 | ||
911a66fb DA |
299 | skb_dst_set(skb, &rt->dst); |
300 | ||
301 | /* strip the ethernet header added for pass through VRF device */ | |
302 | __skb_pull(skb, skb_network_offset(skb)); | |
193125db DA |
303 | |
304 | if (!ip4h->saddr) { | |
305 | ip4h->saddr = inet_select_addr(skb_dst(skb)->dev, 0, | |
306 | RT_SCOPE_LINK); | |
307 | } | |
308 | ||
ebfc102c | 309 | ret = vrf_ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb); |
193125db DA |
310 | if (unlikely(net_xmit_eval(ret))) |
311 | vrf_dev->stats.tx_errors++; | |
312 | else | |
313 | ret = NET_XMIT_SUCCESS; | |
314 | ||
315 | out: | |
316 | return ret; | |
317 | err: | |
57b8efa1 | 318 | vrf_tx_error(vrf_dev, skb); |
193125db DA |
319 | goto out; |
320 | } | |
321 | ||
322 | static netdev_tx_t is_ip_tx_frame(struct sk_buff *skb, struct net_device *dev) | |
323 | { | |
324 | switch (skb->protocol) { | |
325 | case htons(ETH_P_IP): | |
326 | return vrf_process_v4_outbound(skb, dev); | |
327 | case htons(ETH_P_IPV6): | |
328 | return vrf_process_v6_outbound(skb, dev); | |
329 | default: | |
57b8efa1 | 330 | vrf_tx_error(dev, skb); |
193125db DA |
331 | return NET_XMIT_DROP; |
332 | } | |
333 | } | |
334 | ||
335 | static netdev_tx_t vrf_xmit(struct sk_buff *skb, struct net_device *dev) | |
336 | { | |
337 | netdev_tx_t ret = is_ip_tx_frame(skb, dev); | |
338 | ||
339 | if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { | |
340 | struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats); | |
341 | ||
342 | u64_stats_update_begin(&dstats->syncp); | |
343 | dstats->tx_pkts++; | |
344 | dstats->tx_bytes += skb->len; | |
345 | u64_stats_update_end(&dstats->syncp); | |
346 | } else { | |
347 | this_cpu_inc(dev->dstats->tx_drps); | |
348 | } | |
349 | ||
350 | return ret; | |
351 | } | |
352 | ||
35402e31 | 353 | #if IS_ENABLED(CONFIG_IPV6) |
35402e31 DA |
354 | /* modelled after ip6_finish_output2 */ |
355 | static int vrf_finish_output6(struct net *net, struct sock *sk, | |
356 | struct sk_buff *skb) | |
357 | { | |
358 | struct dst_entry *dst = skb_dst(skb); | |
359 | struct net_device *dev = dst->dev; | |
360 | struct neighbour *neigh; | |
361 | struct in6_addr *nexthop; | |
362 | int ret; | |
363 | ||
364 | skb->protocol = htons(ETH_P_IPV6); | |
365 | skb->dev = dev; | |
366 | ||
367 | rcu_read_lock_bh(); | |
368 | nexthop = rt6_nexthop((struct rt6_info *)dst, &ipv6_hdr(skb)->daddr); | |
369 | neigh = __ipv6_neigh_lookup_noref(dst->dev, nexthop); | |
370 | if (unlikely(!neigh)) | |
371 | neigh = __neigh_create(&nd_tbl, nexthop, dst->dev, false); | |
372 | if (!IS_ERR(neigh)) { | |
373 | ret = dst_neigh_output(dst, neigh, skb); | |
374 | rcu_read_unlock_bh(); | |
375 | return ret; | |
376 | } | |
377 | rcu_read_unlock_bh(); | |
378 | ||
379 | IP6_INC_STATS(dev_net(dst->dev), | |
380 | ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES); | |
381 | kfree_skb(skb); | |
382 | return -EINVAL; | |
383 | } | |
384 | ||
385 | /* modelled after ip6_output */ | |
386 | static int vrf_output6(struct net *net, struct sock *sk, struct sk_buff *skb) | |
387 | { | |
388 | return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING, | |
389 | net, sk, skb, NULL, skb_dst(skb)->dev, | |
390 | vrf_finish_output6, | |
391 | !(IP6CB(skb)->flags & IP6SKB_REROUTED)); | |
392 | } | |
393 | ||
b0e95ccd | 394 | /* holding rtnl */ |
810e530b | 395 | static void vrf_rt6_release(struct net_device *dev, struct net_vrf *vrf) |
35402e31 | 396 | { |
b0e95ccd | 397 | struct rt6_info *rt6 = rtnl_dereference(vrf->rt6); |
b4869aa2 | 398 | struct rt6_info *rt6_local = rtnl_dereference(vrf->rt6_local); |
810e530b DA |
399 | struct net *net = dev_net(dev); |
400 | struct dst_entry *dst; | |
b0e95ccd | 401 | |
b4869aa2 DA |
402 | RCU_INIT_POINTER(vrf->rt6, NULL); |
403 | RCU_INIT_POINTER(vrf->rt6_local, NULL); | |
404 | synchronize_rcu(); | |
b0e95ccd | 405 | |
810e530b DA |
406 | /* move dev in dst's to loopback so this VRF device can be deleted |
407 | * - based on dst_ifdown | |
408 | */ | |
409 | if (rt6) { | |
410 | dst = &rt6->dst; | |
411 | dev_put(dst->dev); | |
412 | dst->dev = net->loopback_dev; | |
413 | dev_hold(dst->dev); | |
414 | dst_release(dst); | |
415 | } | |
b4869aa2 DA |
416 | |
417 | if (rt6_local) { | |
418 | if (rt6_local->rt6i_idev) | |
419 | in6_dev_put(rt6_local->rt6i_idev); | |
420 | ||
810e530b DA |
421 | dst = &rt6_local->dst; |
422 | dev_put(dst->dev); | |
423 | dst->dev = net->loopback_dev; | |
424 | dev_hold(dst->dev); | |
425 | dst_release(dst); | |
b4869aa2 | 426 | } |
35402e31 DA |
427 | } |
428 | ||
429 | static int vrf_rt6_create(struct net_device *dev) | |
430 | { | |
b4869aa2 | 431 | int flags = DST_HOST | DST_NOPOLICY | DST_NOXFRM | DST_NOCACHE; |
35402e31 | 432 | struct net_vrf *vrf = netdev_priv(dev); |
9ab179d8 | 433 | struct net *net = dev_net(dev); |
b3b4663c | 434 | struct fib6_table *rt6i_table; |
b4869aa2 | 435 | struct rt6_info *rt6, *rt6_local; |
35402e31 DA |
436 | int rc = -ENOMEM; |
437 | ||
e4348637 DA |
438 | /* IPv6 can be CONFIG enabled and then disabled runtime */ |
439 | if (!ipv6_mod_enabled()) | |
440 | return 0; | |
441 | ||
b3b4663c DA |
442 | rt6i_table = fib6_new_table(net, vrf->tb_id); |
443 | if (!rt6i_table) | |
444 | goto out; | |
445 | ||
b4869aa2 DA |
446 | /* create a dst for routing packets out a VRF device */ |
447 | rt6 = ip6_dst_alloc(net, dev, flags); | |
35402e31 DA |
448 | if (!rt6) |
449 | goto out; | |
450 | ||
9ab179d8 | 451 | dst_hold(&rt6->dst); |
b3b4663c DA |
452 | |
453 | rt6->rt6i_table = rt6i_table; | |
454 | rt6->dst.output = vrf_output6; | |
b4869aa2 DA |
455 | |
456 | /* create a dst for local routing - packets sent locally | |
457 | * to local address via the VRF device as a loopback | |
458 | */ | |
459 | rt6_local = ip6_dst_alloc(net, dev, flags); | |
460 | if (!rt6_local) { | |
461 | dst_release(&rt6->dst); | |
462 | goto out; | |
463 | } | |
464 | ||
465 | dst_hold(&rt6_local->dst); | |
466 | ||
467 | rt6_local->rt6i_idev = in6_dev_get(dev); | |
468 | rt6_local->rt6i_flags = RTF_UP | RTF_NONEXTHOP | RTF_LOCAL; | |
469 | rt6_local->rt6i_table = rt6i_table; | |
470 | rt6_local->dst.input = ip6_input; | |
471 | ||
b0e95ccd | 472 | rcu_assign_pointer(vrf->rt6, rt6); |
b4869aa2 | 473 | rcu_assign_pointer(vrf->rt6_local, rt6_local); |
b0e95ccd | 474 | |
35402e31 DA |
475 | rc = 0; |
476 | out: | |
477 | return rc; | |
478 | } | |
479 | #else | |
810e530b | 480 | static void vrf_rt6_release(struct net_device *dev, struct net_vrf *vrf) |
35402e31 DA |
481 | { |
482 | } | |
483 | ||
484 | static int vrf_rt6_create(struct net_device *dev) | |
485 | { | |
486 | return 0; | |
487 | } | |
488 | #endif | |
489 | ||
8f58336d | 490 | /* modelled after ip_finish_output2 */ |
0c4b51f0 | 491 | static int vrf_finish_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
193125db | 492 | { |
8f58336d DA |
493 | struct dst_entry *dst = skb_dst(skb); |
494 | struct rtable *rt = (struct rtable *)dst; | |
495 | struct net_device *dev = dst->dev; | |
496 | unsigned int hh_len = LL_RESERVED_SPACE(dev); | |
497 | struct neighbour *neigh; | |
498 | u32 nexthop; | |
499 | int ret = -EINVAL; | |
500 | ||
501 | /* Be paranoid, rather than too clever. */ | |
502 | if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) { | |
503 | struct sk_buff *skb2; | |
504 | ||
505 | skb2 = skb_realloc_headroom(skb, LL_RESERVED_SPACE(dev)); | |
506 | if (!skb2) { | |
507 | ret = -ENOMEM; | |
508 | goto err; | |
509 | } | |
510 | if (skb->sk) | |
511 | skb_set_owner_w(skb2, skb->sk); | |
512 | ||
513 | consume_skb(skb); | |
514 | skb = skb2; | |
515 | } | |
516 | ||
517 | rcu_read_lock_bh(); | |
518 | ||
519 | nexthop = (__force u32)rt_nexthop(rt, ip_hdr(skb)->daddr); | |
520 | neigh = __ipv4_neigh_lookup_noref(dev, nexthop); | |
521 | if (unlikely(!neigh)) | |
522 | neigh = __neigh_create(&arp_tbl, &nexthop, dev, false); | |
523 | if (!IS_ERR(neigh)) | |
524 | ret = dst_neigh_output(dst, neigh, skb); | |
525 | ||
526 | rcu_read_unlock_bh(); | |
527 | err: | |
528 | if (unlikely(ret < 0)) | |
529 | vrf_tx_error(skb->dev, skb); | |
530 | return ret; | |
193125db DA |
531 | } |
532 | ||
ede2059d | 533 | static int vrf_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
193125db DA |
534 | { |
535 | struct net_device *dev = skb_dst(skb)->dev; | |
536 | ||
29a26a56 | 537 | IP_UPD_PO_STATS(net, IPSTATS_MIB_OUT, skb->len); |
193125db DA |
538 | |
539 | skb->dev = dev; | |
540 | skb->protocol = htons(ETH_P_IP); | |
541 | ||
29a26a56 EB |
542 | return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING, |
543 | net, sk, skb, NULL, dev, | |
8f58336d | 544 | vrf_finish_output, |
193125db DA |
545 | !(IPCB(skb)->flags & IPSKB_REROUTED)); |
546 | } | |
547 | ||
ebfc102c DA |
548 | /* set dst on skb to send packet to us via dev_xmit path. Allows |
549 | * packet to go through device based features such as qdisc, netfilter | |
550 | * hooks and packet sockets with skb->dev set to vrf device. | |
551 | */ | |
552 | static struct sk_buff *vrf_ip_out(struct net_device *vrf_dev, | |
553 | struct sock *sk, | |
554 | struct sk_buff *skb) | |
555 | { | |
556 | struct net_vrf *vrf = netdev_priv(vrf_dev); | |
557 | struct dst_entry *dst = NULL; | |
558 | struct rtable *rth; | |
559 | ||
560 | rcu_read_lock(); | |
561 | ||
562 | rth = rcu_dereference(vrf->rth); | |
563 | if (likely(rth)) { | |
564 | dst = &rth->dst; | |
565 | dst_hold(dst); | |
566 | } | |
567 | ||
568 | rcu_read_unlock(); | |
569 | ||
570 | if (unlikely(!dst)) { | |
571 | vrf_tx_error(vrf_dev, skb); | |
572 | return NULL; | |
573 | } | |
574 | ||
575 | skb_dst_drop(skb); | |
576 | skb_dst_set(skb, dst); | |
577 | ||
578 | return skb; | |
579 | } | |
580 | ||
581 | /* called with rcu lock held */ | |
582 | static struct sk_buff *vrf_l3_out(struct net_device *vrf_dev, | |
583 | struct sock *sk, | |
584 | struct sk_buff *skb, | |
585 | u16 proto) | |
586 | { | |
587 | switch (proto) { | |
588 | case AF_INET: | |
589 | return vrf_ip_out(vrf_dev, sk, skb); | |
590 | } | |
591 | ||
592 | return skb; | |
593 | } | |
594 | ||
b0e95ccd | 595 | /* holding rtnl */ |
810e530b | 596 | static void vrf_rtable_release(struct net_device *dev, struct net_vrf *vrf) |
193125db | 597 | { |
b0e95ccd | 598 | struct rtable *rth = rtnl_dereference(vrf->rth); |
afe80a49 | 599 | struct rtable *rth_local = rtnl_dereference(vrf->rth_local); |
810e530b DA |
600 | struct net *net = dev_net(dev); |
601 | struct dst_entry *dst; | |
b0e95ccd | 602 | |
afe80a49 DA |
603 | RCU_INIT_POINTER(vrf->rth, NULL); |
604 | RCU_INIT_POINTER(vrf->rth_local, NULL); | |
605 | synchronize_rcu(); | |
193125db | 606 | |
810e530b DA |
607 | /* move dev in dst's to loopback so this VRF device can be deleted |
608 | * - based on dst_ifdown | |
609 | */ | |
610 | if (rth) { | |
611 | dst = &rth->dst; | |
612 | dev_put(dst->dev); | |
613 | dst->dev = net->loopback_dev; | |
614 | dev_hold(dst->dev); | |
615 | dst_release(dst); | |
616 | } | |
afe80a49 | 617 | |
810e530b DA |
618 | if (rth_local) { |
619 | dst = &rth_local->dst; | |
620 | dev_put(dst->dev); | |
621 | dst->dev = net->loopback_dev; | |
622 | dev_hold(dst->dev); | |
623 | dst_release(dst); | |
624 | } | |
193125db DA |
625 | } |
626 | ||
b0e95ccd | 627 | static int vrf_rtable_create(struct net_device *dev) |
193125db | 628 | { |
b7503e0c | 629 | struct net_vrf *vrf = netdev_priv(dev); |
afe80a49 | 630 | struct rtable *rth, *rth_local; |
193125db | 631 | |
b3b4663c | 632 | if (!fib_new_table(dev_net(dev), vrf->tb_id)) |
b0e95ccd | 633 | return -ENOMEM; |
b3b4663c | 634 | |
afe80a49 | 635 | /* create a dst for routing packets out through a VRF device */ |
9ab179d8 | 636 | rth = rt_dst_alloc(dev, 0, RTN_UNICAST, 1, 1, 0); |
b0e95ccd DA |
637 | if (!rth) |
638 | return -ENOMEM; | |
193125db | 639 | |
afe80a49 DA |
640 | /* create a dst for local ingress routing - packets sent locally |
641 | * to local address via the VRF device as a loopback | |
642 | */ | |
643 | rth_local = rt_dst_alloc(dev, RTCF_LOCAL, RTN_LOCAL, 1, 1, 0); | |
644 | if (!rth_local) { | |
645 | dst_release(&rth->dst); | |
646 | return -ENOMEM; | |
647 | } | |
648 | ||
b0e95ccd DA |
649 | rth->dst.output = vrf_output; |
650 | rth->rt_table_id = vrf->tb_id; | |
651 | ||
afe80a49 DA |
652 | rth_local->rt_table_id = vrf->tb_id; |
653 | ||
b0e95ccd | 654 | rcu_assign_pointer(vrf->rth, rth); |
afe80a49 | 655 | rcu_assign_pointer(vrf->rth_local, rth_local); |
b0e95ccd DA |
656 | |
657 | return 0; | |
193125db DA |
658 | } |
659 | ||
660 | /**************************** device handling ********************/ | |
661 | ||
662 | /* cycle interface to flush neighbor cache and move routes across tables */ | |
663 | static void cycle_netdev(struct net_device *dev) | |
664 | { | |
665 | unsigned int flags = dev->flags; | |
666 | int ret; | |
667 | ||
668 | if (!netif_running(dev)) | |
669 | return; | |
670 | ||
671 | ret = dev_change_flags(dev, flags & ~IFF_UP); | |
672 | if (ret >= 0) | |
673 | ret = dev_change_flags(dev, flags); | |
674 | ||
675 | if (ret < 0) { | |
676 | netdev_err(dev, | |
677 | "Failed to cycle device %s; route tables might be wrong!\n", | |
678 | dev->name); | |
679 | } | |
680 | } | |
681 | ||
193125db DA |
682 | static int do_vrf_add_slave(struct net_device *dev, struct net_device *port_dev) |
683 | { | |
bad53162 | 684 | int ret; |
193125db | 685 | |
29bf24af | 686 | ret = netdev_master_upper_dev_link(port_dev, dev, NULL, NULL); |
193125db | 687 | if (ret < 0) |
74b20582 | 688 | return ret; |
193125db | 689 | |
fee6d4c7 | 690 | port_dev->priv_flags |= IFF_L3MDEV_SLAVE; |
193125db DA |
691 | cycle_netdev(port_dev); |
692 | ||
693 | return 0; | |
193125db DA |
694 | } |
695 | ||
696 | static int vrf_add_slave(struct net_device *dev, struct net_device *port_dev) | |
697 | { | |
fee6d4c7 | 698 | if (netif_is_l3_master(port_dev) || netif_is_l3_slave(port_dev)) |
193125db DA |
699 | return -EINVAL; |
700 | ||
701 | return do_vrf_add_slave(dev, port_dev); | |
702 | } | |
703 | ||
704 | /* inverse of do_vrf_add_slave */ | |
705 | static int do_vrf_del_slave(struct net_device *dev, struct net_device *port_dev) | |
706 | { | |
193125db | 707 | netdev_upper_dev_unlink(port_dev, dev); |
fee6d4c7 | 708 | port_dev->priv_flags &= ~IFF_L3MDEV_SLAVE; |
193125db | 709 | |
193125db DA |
710 | cycle_netdev(port_dev); |
711 | ||
193125db DA |
712 | return 0; |
713 | } | |
714 | ||
715 | static int vrf_del_slave(struct net_device *dev, struct net_device *port_dev) | |
716 | { | |
193125db DA |
717 | return do_vrf_del_slave(dev, port_dev); |
718 | } | |
719 | ||
720 | static void vrf_dev_uninit(struct net_device *dev) | |
721 | { | |
722 | struct net_vrf *vrf = netdev_priv(dev); | |
bad53162 NA |
723 | struct net_device *port_dev; |
724 | struct list_head *iter; | |
193125db | 725 | |
810e530b DA |
726 | vrf_rtable_release(dev, vrf); |
727 | vrf_rt6_release(dev, vrf); | |
193125db | 728 | |
bad53162 NA |
729 | netdev_for_each_lower_dev(dev, port_dev, iter) |
730 | vrf_del_slave(dev, port_dev); | |
193125db | 731 | |
3a4a27d3 | 732 | free_percpu(dev->dstats); |
193125db DA |
733 | dev->dstats = NULL; |
734 | } | |
735 | ||
736 | static int vrf_dev_init(struct net_device *dev) | |
737 | { | |
738 | struct net_vrf *vrf = netdev_priv(dev); | |
739 | ||
193125db DA |
740 | dev->dstats = netdev_alloc_pcpu_stats(struct pcpu_dstats); |
741 | if (!dev->dstats) | |
742 | goto out_nomem; | |
743 | ||
744 | /* create the default dst which points back to us */ | |
b0e95ccd | 745 | if (vrf_rtable_create(dev) != 0) |
193125db DA |
746 | goto out_stats; |
747 | ||
35402e31 DA |
748 | if (vrf_rt6_create(dev) != 0) |
749 | goto out_rth; | |
750 | ||
193125db DA |
751 | dev->flags = IFF_MASTER | IFF_NOARP; |
752 | ||
b87ab6b8 DA |
753 | /* MTU is irrelevant for VRF device; set to 64k similar to lo */ |
754 | dev->mtu = 64 * 1024; | |
755 | ||
756 | /* similarly, oper state is irrelevant; set to up to avoid confusion */ | |
757 | dev->operstate = IF_OPER_UP; | |
78e7a2ae | 758 | netdev_lockdep_set_classes(dev); |
193125db DA |
759 | return 0; |
760 | ||
35402e31 | 761 | out_rth: |
810e530b | 762 | vrf_rtable_release(dev, vrf); |
193125db DA |
763 | out_stats: |
764 | free_percpu(dev->dstats); | |
765 | dev->dstats = NULL; | |
766 | out_nomem: | |
767 | return -ENOMEM; | |
768 | } | |
769 | ||
770 | static const struct net_device_ops vrf_netdev_ops = { | |
771 | .ndo_init = vrf_dev_init, | |
772 | .ndo_uninit = vrf_dev_uninit, | |
773 | .ndo_start_xmit = vrf_xmit, | |
774 | .ndo_get_stats64 = vrf_get_stats64, | |
775 | .ndo_add_slave = vrf_add_slave, | |
776 | .ndo_del_slave = vrf_del_slave, | |
777 | }; | |
778 | ||
ee15ee5d DA |
779 | static u32 vrf_fib_table(const struct net_device *dev) |
780 | { | |
781 | struct net_vrf *vrf = netdev_priv(dev); | |
782 | ||
783 | return vrf->tb_id; | |
784 | } | |
785 | ||
786 | static struct rtable *vrf_get_rtable(const struct net_device *dev, | |
787 | const struct flowi4 *fl4) | |
788 | { | |
789 | struct rtable *rth = NULL; | |
790 | ||
6e2895a8 | 791 | if (!(fl4->flowi4_flags & FLOWI_FLAG_L3MDEV_SRC)) { |
ee15ee5d DA |
792 | struct net_vrf *vrf = netdev_priv(dev); |
793 | ||
b0e95ccd DA |
794 | rcu_read_lock(); |
795 | ||
796 | rth = rcu_dereference(vrf->rth); | |
797 | if (likely(rth)) | |
798 | dst_hold(&rth->dst); | |
799 | ||
800 | rcu_read_unlock(); | |
ee15ee5d DA |
801 | } |
802 | ||
803 | return rth; | |
804 | } | |
805 | ||
8cbb512c | 806 | /* called under rcu_read_lock */ |
b5bdacf3 | 807 | static int vrf_get_saddr(struct net_device *dev, struct flowi4 *fl4) |
8cbb512c DA |
808 | { |
809 | struct fib_result res = { .tclassid = 0 }; | |
810 | struct net *net = dev_net(dev); | |
811 | u32 orig_tos = fl4->flowi4_tos; | |
812 | u8 flags = fl4->flowi4_flags; | |
813 | u8 scope = fl4->flowi4_scope; | |
814 | u8 tos = RT_FL_TOS(fl4); | |
b5bdacf3 | 815 | int rc; |
8cbb512c DA |
816 | |
817 | if (unlikely(!fl4->daddr)) | |
b5bdacf3 | 818 | return 0; |
8cbb512c DA |
819 | |
820 | fl4->flowi4_flags |= FLOWI_FLAG_SKIP_NH_OIF; | |
821 | fl4->flowi4_iif = LOOPBACK_IFINDEX; | |
1ff23bee DA |
822 | /* make sure oif is set to VRF device for lookup */ |
823 | fl4->flowi4_oif = dev->ifindex; | |
8cbb512c DA |
824 | fl4->flowi4_tos = tos & IPTOS_RT_MASK; |
825 | fl4->flowi4_scope = ((tos & RTO_ONLINK) ? | |
826 | RT_SCOPE_LINK : RT_SCOPE_UNIVERSE); | |
827 | ||
b5bdacf3 DA |
828 | rc = fib_lookup(net, fl4, &res, 0); |
829 | if (!rc) { | |
8cbb512c DA |
830 | if (res.type == RTN_LOCAL) |
831 | fl4->saddr = res.fi->fib_prefsrc ? : fl4->daddr; | |
832 | else | |
833 | fib_select_path(net, &res, fl4, -1); | |
834 | } | |
835 | ||
836 | fl4->flowi4_flags = flags; | |
837 | fl4->flowi4_tos = orig_tos; | |
838 | fl4->flowi4_scope = scope; | |
b5bdacf3 DA |
839 | |
840 | return rc; | |
8cbb512c DA |
841 | } |
842 | ||
73e20b76 DA |
843 | static int vrf_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb) |
844 | { | |
845 | return 0; | |
846 | } | |
847 | ||
848 | static struct sk_buff *vrf_rcv_nfhook(u8 pf, unsigned int hook, | |
849 | struct sk_buff *skb, | |
850 | struct net_device *dev) | |
851 | { | |
852 | struct net *net = dev_net(dev); | |
853 | ||
854 | nf_reset(skb); | |
855 | ||
856 | if (NF_HOOK(pf, hook, net, NULL, skb, dev, NULL, vrf_rcv_finish) < 0) | |
857 | skb = NULL; /* kfree_skb(skb) handled by nf code */ | |
858 | ||
859 | return skb; | |
860 | } | |
861 | ||
74b20582 DA |
862 | #if IS_ENABLED(CONFIG_IPV6) |
863 | /* neighbor handling is done with actual device; do not want | |
864 | * to flip skb->dev for those ndisc packets. This really fails | |
865 | * for multiple next protocols (e.g., NEXTHDR_HOP). But it is | |
866 | * a start. | |
867 | */ | |
868 | static bool ipv6_ndisc_frame(const struct sk_buff *skb) | |
869 | { | |
870 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
871 | bool rc = false; | |
872 | ||
873 | if (iph->nexthdr == NEXTHDR_ICMP) { | |
874 | const struct icmp6hdr *icmph; | |
875 | struct icmp6hdr _icmph; | |
876 | ||
877 | icmph = skb_header_pointer(skb, sizeof(*iph), | |
878 | sizeof(_icmph), &_icmph); | |
879 | if (!icmph) | |
880 | goto out; | |
881 | ||
882 | switch (icmph->icmp6_type) { | |
883 | case NDISC_ROUTER_SOLICITATION: | |
884 | case NDISC_ROUTER_ADVERTISEMENT: | |
885 | case NDISC_NEIGHBOUR_SOLICITATION: | |
886 | case NDISC_NEIGHBOUR_ADVERTISEMENT: | |
887 | case NDISC_REDIRECT: | |
888 | rc = true; | |
889 | break; | |
890 | } | |
891 | } | |
892 | ||
893 | out: | |
894 | return rc; | |
895 | } | |
896 | ||
9ff74384 DA |
897 | static struct rt6_info *vrf_ip6_route_lookup(struct net *net, |
898 | const struct net_device *dev, | |
899 | struct flowi6 *fl6, | |
900 | int ifindex, | |
901 | int flags) | |
902 | { | |
903 | struct net_vrf *vrf = netdev_priv(dev); | |
904 | struct fib6_table *table = NULL; | |
905 | struct rt6_info *rt6; | |
906 | ||
907 | rcu_read_lock(); | |
908 | ||
909 | /* fib6_table does not have a refcnt and can not be freed */ | |
910 | rt6 = rcu_dereference(vrf->rt6); | |
911 | if (likely(rt6)) | |
912 | table = rt6->rt6i_table; | |
913 | ||
914 | rcu_read_unlock(); | |
915 | ||
916 | if (!table) | |
917 | return NULL; | |
918 | ||
919 | return ip6_pol_route(net, table, ifindex, fl6, flags); | |
920 | } | |
921 | ||
922 | static void vrf_ip6_input_dst(struct sk_buff *skb, struct net_device *vrf_dev, | |
923 | int ifindex) | |
924 | { | |
925 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
926 | struct flowi6 fl6 = { | |
927 | .daddr = iph->daddr, | |
928 | .saddr = iph->saddr, | |
929 | .flowlabel = ip6_flowinfo(iph), | |
930 | .flowi6_mark = skb->mark, | |
931 | .flowi6_proto = iph->nexthdr, | |
932 | .flowi6_iif = ifindex, | |
933 | }; | |
934 | struct net *net = dev_net(vrf_dev); | |
935 | struct rt6_info *rt6; | |
936 | ||
937 | rt6 = vrf_ip6_route_lookup(net, vrf_dev, &fl6, ifindex, | |
938 | RT6_LOOKUP_F_HAS_SADDR | RT6_LOOKUP_F_IFACE); | |
939 | if (unlikely(!rt6)) | |
940 | return; | |
941 | ||
942 | if (unlikely(&rt6->dst == &net->ipv6.ip6_null_entry->dst)) | |
943 | return; | |
944 | ||
945 | skb_dst_set(skb, &rt6->dst); | |
946 | } | |
947 | ||
74b20582 DA |
948 | static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev, |
949 | struct sk_buff *skb) | |
950 | { | |
9ff74384 DA |
951 | int orig_iif = skb->skb_iif; |
952 | bool need_strict; | |
953 | ||
b4869aa2 DA |
954 | /* loopback traffic; do not push through packet taps again. |
955 | * Reset pkt_type for upper layers to process skb | |
956 | */ | |
957 | if (skb->pkt_type == PACKET_LOOPBACK) { | |
958 | skb->dev = vrf_dev; | |
959 | skb->skb_iif = vrf_dev->ifindex; | |
960 | skb->pkt_type = PACKET_HOST; | |
961 | goto out; | |
962 | } | |
963 | ||
9ff74384 DA |
964 | /* if packet is NDISC or addressed to multicast or link-local |
965 | * then keep the ingress interface | |
966 | */ | |
967 | need_strict = rt6_need_strict(&ipv6_hdr(skb)->daddr); | |
968 | if (!ipv6_ndisc_frame(skb) && !need_strict) { | |
74b20582 DA |
969 | skb->dev = vrf_dev; |
970 | skb->skb_iif = vrf_dev->ifindex; | |
971 | ||
972 | skb_push(skb, skb->mac_len); | |
973 | dev_queue_xmit_nit(skb, vrf_dev); | |
974 | skb_pull(skb, skb->mac_len); | |
975 | ||
976 | IP6CB(skb)->flags |= IP6SKB_L3SLAVE; | |
977 | } | |
978 | ||
9ff74384 DA |
979 | if (need_strict) |
980 | vrf_ip6_input_dst(skb, vrf_dev, orig_iif); | |
981 | ||
73e20b76 | 982 | skb = vrf_rcv_nfhook(NFPROTO_IPV6, NF_INET_PRE_ROUTING, skb, vrf_dev); |
b4869aa2 | 983 | out: |
74b20582 DA |
984 | return skb; |
985 | } | |
986 | ||
987 | #else | |
988 | static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev, | |
989 | struct sk_buff *skb) | |
990 | { | |
991 | return skb; | |
992 | } | |
993 | #endif | |
994 | ||
995 | static struct sk_buff *vrf_ip_rcv(struct net_device *vrf_dev, | |
996 | struct sk_buff *skb) | |
997 | { | |
998 | skb->dev = vrf_dev; | |
999 | skb->skb_iif = vrf_dev->ifindex; | |
1000 | ||
afe80a49 DA |
1001 | /* loopback traffic; do not push through packet taps again. |
1002 | * Reset pkt_type for upper layers to process skb | |
1003 | */ | |
1004 | if (skb->pkt_type == PACKET_LOOPBACK) { | |
1005 | skb->pkt_type = PACKET_HOST; | |
1006 | goto out; | |
1007 | } | |
1008 | ||
74b20582 DA |
1009 | skb_push(skb, skb->mac_len); |
1010 | dev_queue_xmit_nit(skb, vrf_dev); | |
1011 | skb_pull(skb, skb->mac_len); | |
1012 | ||
73e20b76 | 1013 | skb = vrf_rcv_nfhook(NFPROTO_IPV4, NF_INET_PRE_ROUTING, skb, vrf_dev); |
afe80a49 | 1014 | out: |
74b20582 DA |
1015 | return skb; |
1016 | } | |
1017 | ||
1018 | /* called with rcu lock held */ | |
1019 | static struct sk_buff *vrf_l3_rcv(struct net_device *vrf_dev, | |
1020 | struct sk_buff *skb, | |
1021 | u16 proto) | |
1022 | { | |
1023 | switch (proto) { | |
1024 | case AF_INET: | |
1025 | return vrf_ip_rcv(vrf_dev, skb); | |
1026 | case AF_INET6: | |
1027 | return vrf_ip6_rcv(vrf_dev, skb); | |
1028 | } | |
1029 | ||
1030 | return skb; | |
1031 | } | |
1032 | ||
35402e31 DA |
1033 | #if IS_ENABLED(CONFIG_IPV6) |
1034 | static struct dst_entry *vrf_get_rt6_dst(const struct net_device *dev, | |
cd2a9e62 | 1035 | struct flowi6 *fl6) |
35402e31 | 1036 | { |
9ff74384 DA |
1037 | bool need_strict = rt6_need_strict(&fl6->daddr); |
1038 | struct net_vrf *vrf = netdev_priv(dev); | |
1039 | struct net *net = dev_net(dev); | |
b0e95ccd | 1040 | struct dst_entry *dst = NULL; |
9ff74384 | 1041 | struct rt6_info *rt; |
35402e31 | 1042 | |
9ff74384 DA |
1043 | /* send to link-local or multicast address */ |
1044 | if (need_strict) { | |
1045 | int flags = RT6_LOOKUP_F_IFACE; | |
1046 | ||
1047 | /* VRF device does not have a link-local address and | |
1048 | * sending packets to link-local or mcast addresses over | |
1049 | * a VRF device does not make sense | |
1050 | */ | |
1051 | if (fl6->flowi6_oif == dev->ifindex) { | |
1052 | struct dst_entry *dst = &net->ipv6.ip6_null_entry->dst; | |
1053 | ||
1054 | dst_hold(dst); | |
1055 | return dst; | |
1056 | } | |
1057 | ||
1058 | if (!ipv6_addr_any(&fl6->saddr)) | |
1059 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
1060 | ||
1061 | rt = vrf_ip6_route_lookup(net, dev, fl6, fl6->flowi6_oif, flags); | |
1062 | if (rt) | |
1063 | dst = &rt->dst; | |
1064 | ||
1065 | } else if (!(fl6->flowi6_flags & FLOWI_FLAG_L3MDEV_SRC)) { | |
b0e95ccd DA |
1066 | |
1067 | rcu_read_lock(); | |
1068 | ||
1069 | rt = rcu_dereference(vrf->rt6); | |
1070 | if (likely(rt)) { | |
1071 | dst = &rt->dst; | |
1072 | dst_hold(dst); | |
1073 | } | |
35402e31 | 1074 | |
b0e95ccd | 1075 | rcu_read_unlock(); |
35402e31 DA |
1076 | } |
1077 | ||
9ff74384 DA |
1078 | /* make sure oif is set to VRF device for lookup */ |
1079 | if (!need_strict) | |
1080 | fl6->flowi6_oif = dev->ifindex; | |
1081 | ||
b0e95ccd | 1082 | return dst; |
35402e31 | 1083 | } |
0d240e78 DA |
1084 | |
1085 | /* called under rcu_read_lock */ | |
1086 | static int vrf_get_saddr6(struct net_device *dev, const struct sock *sk, | |
1087 | struct flowi6 *fl6) | |
1088 | { | |
1089 | struct net *net = dev_net(dev); | |
1090 | struct dst_entry *dst; | |
1091 | struct rt6_info *rt; | |
1092 | int err; | |
1093 | ||
1094 | if (rt6_need_strict(&fl6->daddr)) { | |
1095 | rt = vrf_ip6_route_lookup(net, dev, fl6, fl6->flowi6_oif, | |
1096 | RT6_LOOKUP_F_IFACE); | |
1097 | if (unlikely(!rt)) | |
1098 | return 0; | |
1099 | ||
1100 | dst = &rt->dst; | |
1101 | } else { | |
1102 | __u8 flags = fl6->flowi6_flags; | |
1103 | ||
1104 | fl6->flowi6_flags |= FLOWI_FLAG_L3MDEV_SRC; | |
1105 | fl6->flowi6_flags |= FLOWI_FLAG_SKIP_NH_OIF; | |
1106 | ||
1107 | dst = ip6_route_output(net, sk, fl6); | |
1108 | rt = (struct rt6_info *)dst; | |
1109 | ||
1110 | fl6->flowi6_flags = flags; | |
1111 | } | |
1112 | ||
1113 | err = dst->error; | |
1114 | if (!err) { | |
1115 | err = ip6_route_get_saddr(net, rt, &fl6->daddr, | |
1116 | sk ? inet6_sk(sk)->srcprefs : 0, | |
1117 | &fl6->saddr); | |
1118 | } | |
1119 | ||
1120 | dst_release(dst); | |
1121 | ||
1122 | return err; | |
1123 | } | |
35402e31 DA |
1124 | #endif |
1125 | ||
ee15ee5d DA |
1126 | static const struct l3mdev_ops vrf_l3mdev_ops = { |
1127 | .l3mdev_fib_table = vrf_fib_table, | |
1128 | .l3mdev_get_rtable = vrf_get_rtable, | |
8cbb512c | 1129 | .l3mdev_get_saddr = vrf_get_saddr, |
74b20582 | 1130 | .l3mdev_l3_rcv = vrf_l3_rcv, |
ebfc102c | 1131 | .l3mdev_l3_out = vrf_l3_out, |
35402e31 DA |
1132 | #if IS_ENABLED(CONFIG_IPV6) |
1133 | .l3mdev_get_rt6_dst = vrf_get_rt6_dst, | |
0d240e78 | 1134 | .l3mdev_get_saddr6 = vrf_get_saddr6, |
35402e31 | 1135 | #endif |
ee15ee5d DA |
1136 | }; |
1137 | ||
193125db DA |
1138 | static void vrf_get_drvinfo(struct net_device *dev, |
1139 | struct ethtool_drvinfo *info) | |
1140 | { | |
1141 | strlcpy(info->driver, DRV_NAME, sizeof(info->driver)); | |
1142 | strlcpy(info->version, DRV_VERSION, sizeof(info->version)); | |
1143 | } | |
1144 | ||
1145 | static const struct ethtool_ops vrf_ethtool_ops = { | |
1146 | .get_drvinfo = vrf_get_drvinfo, | |
1147 | }; | |
1148 | ||
1aa6c4f6 DA |
1149 | static inline size_t vrf_fib_rule_nl_size(void) |
1150 | { | |
1151 | size_t sz; | |
1152 | ||
1153 | sz = NLMSG_ALIGN(sizeof(struct fib_rule_hdr)); | |
1154 | sz += nla_total_size(sizeof(u8)); /* FRA_L3MDEV */ | |
1155 | sz += nla_total_size(sizeof(u32)); /* FRA_PRIORITY */ | |
1156 | ||
1157 | return sz; | |
1158 | } | |
1159 | ||
1160 | static int vrf_fib_rule(const struct net_device *dev, __u8 family, bool add_it) | |
1161 | { | |
1162 | struct fib_rule_hdr *frh; | |
1163 | struct nlmsghdr *nlh; | |
1164 | struct sk_buff *skb; | |
1165 | int err; | |
1166 | ||
e4348637 DA |
1167 | if (family == AF_INET6 && !ipv6_mod_enabled()) |
1168 | return 0; | |
1169 | ||
1aa6c4f6 DA |
1170 | skb = nlmsg_new(vrf_fib_rule_nl_size(), GFP_KERNEL); |
1171 | if (!skb) | |
1172 | return -ENOMEM; | |
1173 | ||
1174 | nlh = nlmsg_put(skb, 0, 0, 0, sizeof(*frh), 0); | |
1175 | if (!nlh) | |
1176 | goto nla_put_failure; | |
1177 | ||
1178 | /* rule only needs to appear once */ | |
1179 | nlh->nlmsg_flags &= NLM_F_EXCL; | |
1180 | ||
1181 | frh = nlmsg_data(nlh); | |
1182 | memset(frh, 0, sizeof(*frh)); | |
1183 | frh->family = family; | |
1184 | frh->action = FR_ACT_TO_TBL; | |
1185 | ||
1186 | if (nla_put_u32(skb, FRA_L3MDEV, 1)) | |
1187 | goto nla_put_failure; | |
1188 | ||
1189 | if (nla_put_u32(skb, FRA_PRIORITY, FIB_RULE_PREF)) | |
1190 | goto nla_put_failure; | |
1191 | ||
1192 | nlmsg_end(skb, nlh); | |
1193 | ||
1194 | /* fib_nl_{new,del}rule handling looks for net from skb->sk */ | |
1195 | skb->sk = dev_net(dev)->rtnl; | |
1196 | if (add_it) { | |
1197 | err = fib_nl_newrule(skb, nlh); | |
1198 | if (err == -EEXIST) | |
1199 | err = 0; | |
1200 | } else { | |
1201 | err = fib_nl_delrule(skb, nlh); | |
1202 | if (err == -ENOENT) | |
1203 | err = 0; | |
1204 | } | |
1205 | nlmsg_free(skb); | |
1206 | ||
1207 | return err; | |
1208 | ||
1209 | nla_put_failure: | |
1210 | nlmsg_free(skb); | |
1211 | ||
1212 | return -EMSGSIZE; | |
1213 | } | |
1214 | ||
1215 | static int vrf_add_fib_rules(const struct net_device *dev) | |
1216 | { | |
1217 | int err; | |
1218 | ||
1219 | err = vrf_fib_rule(dev, AF_INET, true); | |
1220 | if (err < 0) | |
1221 | goto out_err; | |
1222 | ||
1223 | err = vrf_fib_rule(dev, AF_INET6, true); | |
1224 | if (err < 0) | |
1225 | goto ipv6_err; | |
1226 | ||
1227 | return 0; | |
1228 | ||
1229 | ipv6_err: | |
1230 | vrf_fib_rule(dev, AF_INET, false); | |
1231 | ||
1232 | out_err: | |
1233 | netdev_err(dev, "Failed to add FIB rules.\n"); | |
1234 | return err; | |
1235 | } | |
1236 | ||
193125db DA |
1237 | static void vrf_setup(struct net_device *dev) |
1238 | { | |
1239 | ether_setup(dev); | |
1240 | ||
1241 | /* Initialize the device structure. */ | |
1242 | dev->netdev_ops = &vrf_netdev_ops; | |
ee15ee5d | 1243 | dev->l3mdev_ops = &vrf_l3mdev_ops; |
193125db DA |
1244 | dev->ethtool_ops = &vrf_ethtool_ops; |
1245 | dev->destructor = free_netdev; | |
1246 | ||
1247 | /* Fill in device structure with ethernet-generic values. */ | |
1248 | eth_hw_addr_random(dev); | |
1249 | ||
1250 | /* don't acquire vrf device's netif_tx_lock when transmitting */ | |
1251 | dev->features |= NETIF_F_LLTX; | |
1252 | ||
1253 | /* don't allow vrf devices to change network namespaces. */ | |
1254 | dev->features |= NETIF_F_NETNS_LOCAL; | |
7889681f DA |
1255 | |
1256 | /* does not make sense for a VLAN to be added to a vrf device */ | |
1257 | dev->features |= NETIF_F_VLAN_CHALLENGED; | |
1258 | ||
1259 | /* enable offload features */ | |
1260 | dev->features |= NETIF_F_GSO_SOFTWARE; | |
1261 | dev->features |= NETIF_F_RXCSUM | NETIF_F_HW_CSUM; | |
1262 | dev->features |= NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA; | |
1263 | ||
1264 | dev->hw_features = dev->features; | |
1265 | dev->hw_enc_features = dev->features; | |
1266 | ||
1267 | /* default to no qdisc; user can add if desired */ | |
1268 | dev->priv_flags |= IFF_NO_QUEUE; | |
193125db DA |
1269 | } |
1270 | ||
1271 | static int vrf_validate(struct nlattr *tb[], struct nlattr *data[]) | |
1272 | { | |
1273 | if (tb[IFLA_ADDRESS]) { | |
1274 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) | |
1275 | return -EINVAL; | |
1276 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) | |
1277 | return -EADDRNOTAVAIL; | |
1278 | } | |
1279 | return 0; | |
1280 | } | |
1281 | ||
1282 | static void vrf_dellink(struct net_device *dev, struct list_head *head) | |
1283 | { | |
193125db DA |
1284 | unregister_netdevice_queue(dev, head); |
1285 | } | |
1286 | ||
1287 | static int vrf_newlink(struct net *src_net, struct net_device *dev, | |
1288 | struct nlattr *tb[], struct nlattr *data[]) | |
1289 | { | |
1290 | struct net_vrf *vrf = netdev_priv(dev); | |
1aa6c4f6 | 1291 | int err; |
193125db DA |
1292 | |
1293 | if (!data || !data[IFLA_VRF_TABLE]) | |
1294 | return -EINVAL; | |
1295 | ||
1296 | vrf->tb_id = nla_get_u32(data[IFLA_VRF_TABLE]); | |
1297 | ||
007979ea | 1298 | dev->priv_flags |= IFF_L3MDEV_MASTER; |
193125db | 1299 | |
1aa6c4f6 DA |
1300 | err = register_netdevice(dev); |
1301 | if (err) | |
1302 | goto out; | |
1303 | ||
1304 | if (add_fib_rules) { | |
1305 | err = vrf_add_fib_rules(dev); | |
1306 | if (err) { | |
1307 | unregister_netdevice(dev); | |
1308 | goto out; | |
1309 | } | |
1310 | add_fib_rules = false; | |
1311 | } | |
1312 | ||
1313 | out: | |
1314 | return err; | |
193125db DA |
1315 | } |
1316 | ||
1317 | static size_t vrf_nl_getsize(const struct net_device *dev) | |
1318 | { | |
1319 | return nla_total_size(sizeof(u32)); /* IFLA_VRF_TABLE */ | |
1320 | } | |
1321 | ||
1322 | static int vrf_fillinfo(struct sk_buff *skb, | |
1323 | const struct net_device *dev) | |
1324 | { | |
1325 | struct net_vrf *vrf = netdev_priv(dev); | |
1326 | ||
1327 | return nla_put_u32(skb, IFLA_VRF_TABLE, vrf->tb_id); | |
1328 | } | |
1329 | ||
67eb0331 DA |
1330 | static size_t vrf_get_slave_size(const struct net_device *bond_dev, |
1331 | const struct net_device *slave_dev) | |
1332 | { | |
1333 | return nla_total_size(sizeof(u32)); /* IFLA_VRF_PORT_TABLE */ | |
1334 | } | |
1335 | ||
1336 | static int vrf_fill_slave_info(struct sk_buff *skb, | |
1337 | const struct net_device *vrf_dev, | |
1338 | const struct net_device *slave_dev) | |
1339 | { | |
1340 | struct net_vrf *vrf = netdev_priv(vrf_dev); | |
1341 | ||
1342 | if (nla_put_u32(skb, IFLA_VRF_PORT_TABLE, vrf->tb_id)) | |
1343 | return -EMSGSIZE; | |
1344 | ||
1345 | return 0; | |
1346 | } | |
1347 | ||
193125db DA |
1348 | static const struct nla_policy vrf_nl_policy[IFLA_VRF_MAX + 1] = { |
1349 | [IFLA_VRF_TABLE] = { .type = NLA_U32 }, | |
1350 | }; | |
1351 | ||
1352 | static struct rtnl_link_ops vrf_link_ops __read_mostly = { | |
1353 | .kind = DRV_NAME, | |
1354 | .priv_size = sizeof(struct net_vrf), | |
1355 | ||
1356 | .get_size = vrf_nl_getsize, | |
1357 | .policy = vrf_nl_policy, | |
1358 | .validate = vrf_validate, | |
1359 | .fill_info = vrf_fillinfo, | |
1360 | ||
67eb0331 DA |
1361 | .get_slave_size = vrf_get_slave_size, |
1362 | .fill_slave_info = vrf_fill_slave_info, | |
1363 | ||
193125db DA |
1364 | .newlink = vrf_newlink, |
1365 | .dellink = vrf_dellink, | |
1366 | .setup = vrf_setup, | |
1367 | .maxtype = IFLA_VRF_MAX, | |
1368 | }; | |
1369 | ||
1370 | static int vrf_device_event(struct notifier_block *unused, | |
1371 | unsigned long event, void *ptr) | |
1372 | { | |
1373 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
1374 | ||
1375 | /* only care about unregister events to drop slave references */ | |
1376 | if (event == NETDEV_UNREGISTER) { | |
193125db DA |
1377 | struct net_device *vrf_dev; |
1378 | ||
fee6d4c7 | 1379 | if (!netif_is_l3_slave(dev)) |
193125db DA |
1380 | goto out; |
1381 | ||
58aa9087 NA |
1382 | vrf_dev = netdev_master_upper_dev_get(dev); |
1383 | vrf_del_slave(vrf_dev, dev); | |
193125db DA |
1384 | } |
1385 | out: | |
1386 | return NOTIFY_DONE; | |
1387 | } | |
1388 | ||
1389 | static struct notifier_block vrf_notifier_block __read_mostly = { | |
1390 | .notifier_call = vrf_device_event, | |
1391 | }; | |
1392 | ||
1393 | static int __init vrf_init_module(void) | |
1394 | { | |
1395 | int rc; | |
1396 | ||
193125db DA |
1397 | register_netdevice_notifier(&vrf_notifier_block); |
1398 | ||
1399 | rc = rtnl_link_register(&vrf_link_ops); | |
1400 | if (rc < 0) | |
1401 | goto error; | |
1402 | ||
1403 | return 0; | |
1404 | ||
1405 | error: | |
1406 | unregister_netdevice_notifier(&vrf_notifier_block); | |
193125db DA |
1407 | return rc; |
1408 | } | |
1409 | ||
193125db | 1410 | module_init(vrf_init_module); |
193125db DA |
1411 | MODULE_AUTHOR("Shrijeet Mukherjee, David Ahern"); |
1412 | MODULE_DESCRIPTION("Device driver to instantiate VRF domains"); | |
1413 | MODULE_LICENSE("GPL"); | |
1414 | MODULE_ALIAS_RTNL_LINK(DRV_NAME); | |
1415 | MODULE_VERSION(DRV_VERSION); |