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Commit | Line | Data |
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193125db DA |
1 | /* |
2 | * vrf.c: device driver to encapsulate a VRF space | |
3 | * | |
4 | * Copyright (c) 2015 Cumulus Networks. All rights reserved. | |
5 | * Copyright (c) 2015 Shrijeet Mukherjee <shm@cumulusnetworks.com> | |
6 | * Copyright (c) 2015 David Ahern <dsa@cumulusnetworks.com> | |
7 | * | |
8 | * Based on dummy, team and ipvlan drivers | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | */ | |
15 | ||
16 | #include <linux/module.h> | |
17 | #include <linux/kernel.h> | |
18 | #include <linux/netdevice.h> | |
19 | #include <linux/etherdevice.h> | |
20 | #include <linux/ip.h> | |
21 | #include <linux/init.h> | |
22 | #include <linux/moduleparam.h> | |
23 | #include <linux/netfilter.h> | |
24 | #include <linux/rtnetlink.h> | |
25 | #include <net/rtnetlink.h> | |
26 | #include <linux/u64_stats_sync.h> | |
27 | #include <linux/hashtable.h> | |
28 | ||
29 | #include <linux/inetdevice.h> | |
8f58336d | 30 | #include <net/arp.h> |
193125db DA |
31 | #include <net/ip.h> |
32 | #include <net/ip_fib.h> | |
35402e31 | 33 | #include <net/ip6_fib.h> |
193125db | 34 | #include <net/ip6_route.h> |
193125db DA |
35 | #include <net/route.h> |
36 | #include <net/addrconf.h> | |
ee15ee5d | 37 | #include <net/l3mdev.h> |
1aa6c4f6 | 38 | #include <net/fib_rules.h> |
193125db DA |
39 | |
40 | #define DRV_NAME "vrf" | |
41 | #define DRV_VERSION "1.0" | |
42 | ||
1aa6c4f6 DA |
43 | #define FIB_RULE_PREF 1000 /* default preference for FIB rules */ |
44 | static bool add_fib_rules = true; | |
45 | ||
ec539514 | 46 | struct net_vrf { |
b0e95ccd | 47 | struct rtable __rcu *rth; |
afe80a49 | 48 | struct rtable __rcu *rth_local; |
b0e95ccd | 49 | struct rt6_info __rcu *rt6; |
b4869aa2 | 50 | struct rt6_info __rcu *rt6_local; |
ec539514 DA |
51 | u32 tb_id; |
52 | }; | |
53 | ||
193125db DA |
54 | struct pcpu_dstats { |
55 | u64 tx_pkts; | |
56 | u64 tx_bytes; | |
57 | u64 tx_drps; | |
58 | u64 rx_pkts; | |
59 | u64 rx_bytes; | |
afe80a49 | 60 | u64 rx_drps; |
193125db DA |
61 | struct u64_stats_sync syncp; |
62 | }; | |
63 | ||
afe80a49 DA |
64 | static void vrf_rx_stats(struct net_device *dev, int len) |
65 | { | |
66 | struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats); | |
67 | ||
68 | u64_stats_update_begin(&dstats->syncp); | |
69 | dstats->rx_pkts++; | |
70 | dstats->rx_bytes += len; | |
71 | u64_stats_update_end(&dstats->syncp); | |
72 | } | |
73 | ||
57b8efa1 NA |
74 | static void vrf_tx_error(struct net_device *vrf_dev, struct sk_buff *skb) |
75 | { | |
76 | vrf_dev->stats.tx_errors++; | |
77 | kfree_skb(skb); | |
78 | } | |
79 | ||
bc1f4470 | 80 | static void vrf_get_stats64(struct net_device *dev, |
81 | struct rtnl_link_stats64 *stats) | |
193125db DA |
82 | { |
83 | int i; | |
84 | ||
85 | for_each_possible_cpu(i) { | |
86 | const struct pcpu_dstats *dstats; | |
87 | u64 tbytes, tpkts, tdrops, rbytes, rpkts; | |
88 | unsigned int start; | |
89 | ||
90 | dstats = per_cpu_ptr(dev->dstats, i); | |
91 | do { | |
92 | start = u64_stats_fetch_begin_irq(&dstats->syncp); | |
93 | tbytes = dstats->tx_bytes; | |
94 | tpkts = dstats->tx_pkts; | |
95 | tdrops = dstats->tx_drps; | |
96 | rbytes = dstats->rx_bytes; | |
97 | rpkts = dstats->rx_pkts; | |
98 | } while (u64_stats_fetch_retry_irq(&dstats->syncp, start)); | |
99 | stats->tx_bytes += tbytes; | |
100 | stats->tx_packets += tpkts; | |
101 | stats->tx_dropped += tdrops; | |
102 | stats->rx_bytes += rbytes; | |
103 | stats->rx_packets += rpkts; | |
104 | } | |
193125db DA |
105 | } |
106 | ||
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 | { | |
343 | netdev_tx_t ret = is_ip_tx_frame(skb, dev); | |
344 | ||
345 | if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { | |
346 | struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats); | |
347 | ||
348 | u64_stats_update_begin(&dstats->syncp); | |
349 | dstats->tx_pkts++; | |
350 | dstats->tx_bytes += skb->len; | |
351 | u64_stats_update_end(&dstats->syncp); | |
352 | } else { | |
353 | this_cpu_inc(dev->dstats->tx_drps); | |
354 | } | |
355 | ||
356 | return ret; | |
357 | } | |
358 | ||
35402e31 | 359 | #if IS_ENABLED(CONFIG_IPV6) |
35402e31 DA |
360 | /* modelled after ip6_finish_output2 */ |
361 | static int vrf_finish_output6(struct net *net, struct sock *sk, | |
362 | struct sk_buff *skb) | |
363 | { | |
364 | struct dst_entry *dst = skb_dst(skb); | |
365 | struct net_device *dev = dst->dev; | |
366 | struct neighbour *neigh; | |
367 | struct in6_addr *nexthop; | |
368 | int ret; | |
369 | ||
eb63ecc1 DA |
370 | nf_reset(skb); |
371 | ||
35402e31 DA |
372 | skb->protocol = htons(ETH_P_IPV6); |
373 | skb->dev = dev; | |
374 | ||
375 | rcu_read_lock_bh(); | |
376 | nexthop = rt6_nexthop((struct rt6_info *)dst, &ipv6_hdr(skb)->daddr); | |
377 | neigh = __ipv6_neigh_lookup_noref(dst->dev, nexthop); | |
378 | if (unlikely(!neigh)) | |
379 | neigh = __neigh_create(&nd_tbl, nexthop, dst->dev, false); | |
380 | if (!IS_ERR(neigh)) { | |
381 | ret = dst_neigh_output(dst, neigh, skb); | |
382 | rcu_read_unlock_bh(); | |
383 | return ret; | |
384 | } | |
385 | rcu_read_unlock_bh(); | |
386 | ||
387 | IP6_INC_STATS(dev_net(dst->dev), | |
388 | ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES); | |
389 | kfree_skb(skb); | |
390 | return -EINVAL; | |
391 | } | |
392 | ||
393 | /* modelled after ip6_output */ | |
394 | static int vrf_output6(struct net *net, struct sock *sk, struct sk_buff *skb) | |
395 | { | |
396 | return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING, | |
397 | net, sk, skb, NULL, skb_dst(skb)->dev, | |
398 | vrf_finish_output6, | |
399 | !(IP6CB(skb)->flags & IP6SKB_REROUTED)); | |
400 | } | |
401 | ||
4c1feac5 DA |
402 | /* set dst on skb to send packet to us via dev_xmit path. Allows |
403 | * packet to go through device based features such as qdisc, netfilter | |
404 | * hooks and packet sockets with skb->dev set to vrf device. | |
405 | */ | |
406 | static struct sk_buff *vrf_ip6_out(struct net_device *vrf_dev, | |
407 | struct sock *sk, | |
408 | struct sk_buff *skb) | |
409 | { | |
410 | struct net_vrf *vrf = netdev_priv(vrf_dev); | |
411 | struct dst_entry *dst = NULL; | |
412 | struct rt6_info *rt6; | |
413 | ||
414 | /* don't divert link scope packets */ | |
415 | if (rt6_need_strict(&ipv6_hdr(skb)->daddr)) | |
416 | return skb; | |
417 | ||
418 | rcu_read_lock(); | |
419 | ||
420 | rt6 = rcu_dereference(vrf->rt6); | |
421 | if (likely(rt6)) { | |
422 | dst = &rt6->dst; | |
423 | dst_hold(dst); | |
424 | } | |
425 | ||
426 | rcu_read_unlock(); | |
427 | ||
428 | if (unlikely(!dst)) { | |
429 | vrf_tx_error(vrf_dev, skb); | |
430 | return NULL; | |
431 | } | |
432 | ||
433 | skb_dst_drop(skb); | |
434 | skb_dst_set(skb, dst); | |
435 | ||
436 | return skb; | |
437 | } | |
438 | ||
b0e95ccd | 439 | /* holding rtnl */ |
810e530b | 440 | static void vrf_rt6_release(struct net_device *dev, struct net_vrf *vrf) |
35402e31 | 441 | { |
b0e95ccd | 442 | struct rt6_info *rt6 = rtnl_dereference(vrf->rt6); |
b4869aa2 | 443 | struct rt6_info *rt6_local = rtnl_dereference(vrf->rt6_local); |
810e530b DA |
444 | struct net *net = dev_net(dev); |
445 | struct dst_entry *dst; | |
b0e95ccd | 446 | |
b4869aa2 DA |
447 | RCU_INIT_POINTER(vrf->rt6, NULL); |
448 | RCU_INIT_POINTER(vrf->rt6_local, NULL); | |
449 | synchronize_rcu(); | |
b0e95ccd | 450 | |
810e530b DA |
451 | /* move dev in dst's to loopback so this VRF device can be deleted |
452 | * - based on dst_ifdown | |
453 | */ | |
454 | if (rt6) { | |
455 | dst = &rt6->dst; | |
456 | dev_put(dst->dev); | |
457 | dst->dev = net->loopback_dev; | |
458 | dev_hold(dst->dev); | |
459 | dst_release(dst); | |
460 | } | |
b4869aa2 DA |
461 | |
462 | if (rt6_local) { | |
463 | if (rt6_local->rt6i_idev) | |
464 | in6_dev_put(rt6_local->rt6i_idev); | |
465 | ||
810e530b DA |
466 | dst = &rt6_local->dst; |
467 | dev_put(dst->dev); | |
468 | dst->dev = net->loopback_dev; | |
469 | dev_hold(dst->dev); | |
470 | dst_release(dst); | |
b4869aa2 | 471 | } |
35402e31 DA |
472 | } |
473 | ||
474 | static int vrf_rt6_create(struct net_device *dev) | |
475 | { | |
b4869aa2 | 476 | int flags = DST_HOST | DST_NOPOLICY | DST_NOXFRM | DST_NOCACHE; |
35402e31 | 477 | struct net_vrf *vrf = netdev_priv(dev); |
9ab179d8 | 478 | struct net *net = dev_net(dev); |
b3b4663c | 479 | struct fib6_table *rt6i_table; |
b4869aa2 | 480 | struct rt6_info *rt6, *rt6_local; |
35402e31 DA |
481 | int rc = -ENOMEM; |
482 | ||
e4348637 DA |
483 | /* IPv6 can be CONFIG enabled and then disabled runtime */ |
484 | if (!ipv6_mod_enabled()) | |
485 | return 0; | |
486 | ||
b3b4663c DA |
487 | rt6i_table = fib6_new_table(net, vrf->tb_id); |
488 | if (!rt6i_table) | |
489 | goto out; | |
490 | ||
b4869aa2 DA |
491 | /* create a dst for routing packets out a VRF device */ |
492 | rt6 = ip6_dst_alloc(net, dev, flags); | |
35402e31 DA |
493 | if (!rt6) |
494 | goto out; | |
495 | ||
9ab179d8 | 496 | dst_hold(&rt6->dst); |
b3b4663c DA |
497 | |
498 | rt6->rt6i_table = rt6i_table; | |
499 | rt6->dst.output = vrf_output6; | |
b4869aa2 DA |
500 | |
501 | /* create a dst for local routing - packets sent locally | |
502 | * to local address via the VRF device as a loopback | |
503 | */ | |
504 | rt6_local = ip6_dst_alloc(net, dev, flags); | |
505 | if (!rt6_local) { | |
506 | dst_release(&rt6->dst); | |
507 | goto out; | |
508 | } | |
509 | ||
510 | dst_hold(&rt6_local->dst); | |
511 | ||
512 | rt6_local->rt6i_idev = in6_dev_get(dev); | |
513 | rt6_local->rt6i_flags = RTF_UP | RTF_NONEXTHOP | RTF_LOCAL; | |
514 | rt6_local->rt6i_table = rt6i_table; | |
515 | rt6_local->dst.input = ip6_input; | |
516 | ||
b0e95ccd | 517 | rcu_assign_pointer(vrf->rt6, rt6); |
b4869aa2 | 518 | rcu_assign_pointer(vrf->rt6_local, rt6_local); |
b0e95ccd | 519 | |
35402e31 DA |
520 | rc = 0; |
521 | out: | |
522 | return rc; | |
523 | } | |
524 | #else | |
4c1feac5 DA |
525 | static struct sk_buff *vrf_ip6_out(struct net_device *vrf_dev, |
526 | struct sock *sk, | |
527 | struct sk_buff *skb) | |
528 | { | |
529 | return skb; | |
530 | } | |
531 | ||
810e530b | 532 | static void vrf_rt6_release(struct net_device *dev, struct net_vrf *vrf) |
35402e31 DA |
533 | { |
534 | } | |
535 | ||
536 | static int vrf_rt6_create(struct net_device *dev) | |
537 | { | |
538 | return 0; | |
539 | } | |
540 | #endif | |
541 | ||
8f58336d | 542 | /* modelled after ip_finish_output2 */ |
0c4b51f0 | 543 | static int vrf_finish_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
193125db | 544 | { |
8f58336d DA |
545 | struct dst_entry *dst = skb_dst(skb); |
546 | struct rtable *rt = (struct rtable *)dst; | |
547 | struct net_device *dev = dst->dev; | |
548 | unsigned int hh_len = LL_RESERVED_SPACE(dev); | |
549 | struct neighbour *neigh; | |
550 | u32 nexthop; | |
551 | int ret = -EINVAL; | |
552 | ||
eb63ecc1 DA |
553 | nf_reset(skb); |
554 | ||
8f58336d DA |
555 | /* Be paranoid, rather than too clever. */ |
556 | if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) { | |
557 | struct sk_buff *skb2; | |
558 | ||
559 | skb2 = skb_realloc_headroom(skb, LL_RESERVED_SPACE(dev)); | |
560 | if (!skb2) { | |
561 | ret = -ENOMEM; | |
562 | goto err; | |
563 | } | |
564 | if (skb->sk) | |
565 | skb_set_owner_w(skb2, skb->sk); | |
566 | ||
567 | consume_skb(skb); | |
568 | skb = skb2; | |
569 | } | |
570 | ||
571 | rcu_read_lock_bh(); | |
572 | ||
573 | nexthop = (__force u32)rt_nexthop(rt, ip_hdr(skb)->daddr); | |
574 | neigh = __ipv4_neigh_lookup_noref(dev, nexthop); | |
575 | if (unlikely(!neigh)) | |
576 | neigh = __neigh_create(&arp_tbl, &nexthop, dev, false); | |
577 | if (!IS_ERR(neigh)) | |
578 | ret = dst_neigh_output(dst, neigh, skb); | |
579 | ||
580 | rcu_read_unlock_bh(); | |
581 | err: | |
582 | if (unlikely(ret < 0)) | |
583 | vrf_tx_error(skb->dev, skb); | |
584 | return ret; | |
193125db DA |
585 | } |
586 | ||
ede2059d | 587 | static int vrf_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
193125db DA |
588 | { |
589 | struct net_device *dev = skb_dst(skb)->dev; | |
590 | ||
29a26a56 | 591 | IP_UPD_PO_STATS(net, IPSTATS_MIB_OUT, skb->len); |
193125db DA |
592 | |
593 | skb->dev = dev; | |
594 | skb->protocol = htons(ETH_P_IP); | |
595 | ||
29a26a56 EB |
596 | return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING, |
597 | net, sk, skb, NULL, dev, | |
8f58336d | 598 | vrf_finish_output, |
193125db DA |
599 | !(IPCB(skb)->flags & IPSKB_REROUTED)); |
600 | } | |
601 | ||
ebfc102c DA |
602 | /* set dst on skb to send packet to us via dev_xmit path. Allows |
603 | * packet to go through device based features such as qdisc, netfilter | |
604 | * hooks and packet sockets with skb->dev set to vrf device. | |
605 | */ | |
606 | static struct sk_buff *vrf_ip_out(struct net_device *vrf_dev, | |
607 | struct sock *sk, | |
608 | struct sk_buff *skb) | |
609 | { | |
610 | struct net_vrf *vrf = netdev_priv(vrf_dev); | |
611 | struct dst_entry *dst = NULL; | |
612 | struct rtable *rth; | |
613 | ||
e58e4159 DA |
614 | /* don't divert multicast */ |
615 | if (ipv4_is_multicast(ip_hdr(skb)->daddr)) | |
616 | return skb; | |
617 | ||
ebfc102c DA |
618 | rcu_read_lock(); |
619 | ||
620 | rth = rcu_dereference(vrf->rth); | |
621 | if (likely(rth)) { | |
622 | dst = &rth->dst; | |
623 | dst_hold(dst); | |
624 | } | |
625 | ||
626 | rcu_read_unlock(); | |
627 | ||
628 | if (unlikely(!dst)) { | |
629 | vrf_tx_error(vrf_dev, skb); | |
630 | return NULL; | |
631 | } | |
632 | ||
633 | skb_dst_drop(skb); | |
634 | skb_dst_set(skb, dst); | |
635 | ||
636 | return skb; | |
637 | } | |
638 | ||
639 | /* called with rcu lock held */ | |
640 | static struct sk_buff *vrf_l3_out(struct net_device *vrf_dev, | |
641 | struct sock *sk, | |
642 | struct sk_buff *skb, | |
643 | u16 proto) | |
644 | { | |
645 | switch (proto) { | |
646 | case AF_INET: | |
647 | return vrf_ip_out(vrf_dev, sk, skb); | |
4c1feac5 DA |
648 | case AF_INET6: |
649 | return vrf_ip6_out(vrf_dev, sk, skb); | |
ebfc102c DA |
650 | } |
651 | ||
652 | return skb; | |
653 | } | |
654 | ||
b0e95ccd | 655 | /* holding rtnl */ |
810e530b | 656 | static void vrf_rtable_release(struct net_device *dev, struct net_vrf *vrf) |
193125db | 657 | { |
b0e95ccd | 658 | struct rtable *rth = rtnl_dereference(vrf->rth); |
afe80a49 | 659 | struct rtable *rth_local = rtnl_dereference(vrf->rth_local); |
810e530b DA |
660 | struct net *net = dev_net(dev); |
661 | struct dst_entry *dst; | |
b0e95ccd | 662 | |
afe80a49 DA |
663 | RCU_INIT_POINTER(vrf->rth, NULL); |
664 | RCU_INIT_POINTER(vrf->rth_local, NULL); | |
665 | synchronize_rcu(); | |
193125db | 666 | |
810e530b DA |
667 | /* move dev in dst's to loopback so this VRF device can be deleted |
668 | * - based on dst_ifdown | |
669 | */ | |
670 | if (rth) { | |
671 | dst = &rth->dst; | |
672 | dev_put(dst->dev); | |
673 | dst->dev = net->loopback_dev; | |
674 | dev_hold(dst->dev); | |
675 | dst_release(dst); | |
676 | } | |
afe80a49 | 677 | |
810e530b DA |
678 | if (rth_local) { |
679 | dst = &rth_local->dst; | |
680 | dev_put(dst->dev); | |
681 | dst->dev = net->loopback_dev; | |
682 | dev_hold(dst->dev); | |
683 | dst_release(dst); | |
684 | } | |
193125db DA |
685 | } |
686 | ||
b0e95ccd | 687 | static int vrf_rtable_create(struct net_device *dev) |
193125db | 688 | { |
b7503e0c | 689 | struct net_vrf *vrf = netdev_priv(dev); |
afe80a49 | 690 | struct rtable *rth, *rth_local; |
193125db | 691 | |
b3b4663c | 692 | if (!fib_new_table(dev_net(dev), vrf->tb_id)) |
b0e95ccd | 693 | return -ENOMEM; |
b3b4663c | 694 | |
afe80a49 | 695 | /* create a dst for routing packets out through a VRF device */ |
9ab179d8 | 696 | rth = rt_dst_alloc(dev, 0, RTN_UNICAST, 1, 1, 0); |
b0e95ccd DA |
697 | if (!rth) |
698 | return -ENOMEM; | |
193125db | 699 | |
afe80a49 DA |
700 | /* create a dst for local ingress routing - packets sent locally |
701 | * to local address via the VRF device as a loopback | |
702 | */ | |
703 | rth_local = rt_dst_alloc(dev, RTCF_LOCAL, RTN_LOCAL, 1, 1, 0); | |
704 | if (!rth_local) { | |
705 | dst_release(&rth->dst); | |
706 | return -ENOMEM; | |
707 | } | |
708 | ||
b0e95ccd DA |
709 | rth->dst.output = vrf_output; |
710 | rth->rt_table_id = vrf->tb_id; | |
711 | ||
afe80a49 DA |
712 | rth_local->rt_table_id = vrf->tb_id; |
713 | ||
b0e95ccd | 714 | rcu_assign_pointer(vrf->rth, rth); |
afe80a49 | 715 | rcu_assign_pointer(vrf->rth_local, rth_local); |
b0e95ccd DA |
716 | |
717 | return 0; | |
193125db DA |
718 | } |
719 | ||
720 | /**************************** device handling ********************/ | |
721 | ||
722 | /* cycle interface to flush neighbor cache and move routes across tables */ | |
723 | static void cycle_netdev(struct net_device *dev) | |
724 | { | |
725 | unsigned int flags = dev->flags; | |
726 | int ret; | |
727 | ||
728 | if (!netif_running(dev)) | |
729 | return; | |
730 | ||
731 | ret = dev_change_flags(dev, flags & ~IFF_UP); | |
732 | if (ret >= 0) | |
733 | ret = dev_change_flags(dev, flags); | |
734 | ||
735 | if (ret < 0) { | |
736 | netdev_err(dev, | |
737 | "Failed to cycle device %s; route tables might be wrong!\n", | |
738 | dev->name); | |
739 | } | |
740 | } | |
741 | ||
193125db DA |
742 | static int do_vrf_add_slave(struct net_device *dev, struct net_device *port_dev) |
743 | { | |
bad53162 | 744 | int ret; |
193125db | 745 | |
29bf24af | 746 | ret = netdev_master_upper_dev_link(port_dev, dev, NULL, NULL); |
193125db | 747 | if (ret < 0) |
74b20582 | 748 | return ret; |
193125db | 749 | |
fee6d4c7 | 750 | port_dev->priv_flags |= IFF_L3MDEV_SLAVE; |
193125db DA |
751 | cycle_netdev(port_dev); |
752 | ||
753 | return 0; | |
193125db DA |
754 | } |
755 | ||
756 | static int vrf_add_slave(struct net_device *dev, struct net_device *port_dev) | |
757 | { | |
fee6d4c7 | 758 | if (netif_is_l3_master(port_dev) || netif_is_l3_slave(port_dev)) |
193125db DA |
759 | return -EINVAL; |
760 | ||
761 | return do_vrf_add_slave(dev, port_dev); | |
762 | } | |
763 | ||
764 | /* inverse of do_vrf_add_slave */ | |
765 | static int do_vrf_del_slave(struct net_device *dev, struct net_device *port_dev) | |
766 | { | |
193125db | 767 | netdev_upper_dev_unlink(port_dev, dev); |
fee6d4c7 | 768 | port_dev->priv_flags &= ~IFF_L3MDEV_SLAVE; |
193125db | 769 | |
193125db DA |
770 | cycle_netdev(port_dev); |
771 | ||
193125db DA |
772 | return 0; |
773 | } | |
774 | ||
775 | static int vrf_del_slave(struct net_device *dev, struct net_device *port_dev) | |
776 | { | |
193125db DA |
777 | return do_vrf_del_slave(dev, port_dev); |
778 | } | |
779 | ||
780 | static void vrf_dev_uninit(struct net_device *dev) | |
781 | { | |
782 | struct net_vrf *vrf = netdev_priv(dev); | |
bad53162 NA |
783 | struct net_device *port_dev; |
784 | struct list_head *iter; | |
193125db | 785 | |
810e530b DA |
786 | vrf_rtable_release(dev, vrf); |
787 | vrf_rt6_release(dev, vrf); | |
193125db | 788 | |
bad53162 NA |
789 | netdev_for_each_lower_dev(dev, port_dev, iter) |
790 | vrf_del_slave(dev, port_dev); | |
193125db | 791 | |
3a4a27d3 | 792 | free_percpu(dev->dstats); |
193125db DA |
793 | dev->dstats = NULL; |
794 | } | |
795 | ||
796 | static int vrf_dev_init(struct net_device *dev) | |
797 | { | |
798 | struct net_vrf *vrf = netdev_priv(dev); | |
799 | ||
193125db DA |
800 | dev->dstats = netdev_alloc_pcpu_stats(struct pcpu_dstats); |
801 | if (!dev->dstats) | |
802 | goto out_nomem; | |
803 | ||
804 | /* create the default dst which points back to us */ | |
b0e95ccd | 805 | if (vrf_rtable_create(dev) != 0) |
193125db DA |
806 | goto out_stats; |
807 | ||
35402e31 DA |
808 | if (vrf_rt6_create(dev) != 0) |
809 | goto out_rth; | |
810 | ||
193125db DA |
811 | dev->flags = IFF_MASTER | IFF_NOARP; |
812 | ||
b87ab6b8 DA |
813 | /* MTU is irrelevant for VRF device; set to 64k similar to lo */ |
814 | dev->mtu = 64 * 1024; | |
815 | ||
816 | /* similarly, oper state is irrelevant; set to up to avoid confusion */ | |
817 | dev->operstate = IF_OPER_UP; | |
78e7a2ae | 818 | netdev_lockdep_set_classes(dev); |
193125db DA |
819 | return 0; |
820 | ||
35402e31 | 821 | out_rth: |
810e530b | 822 | vrf_rtable_release(dev, vrf); |
193125db DA |
823 | out_stats: |
824 | free_percpu(dev->dstats); | |
825 | dev->dstats = NULL; | |
826 | out_nomem: | |
827 | return -ENOMEM; | |
828 | } | |
829 | ||
830 | static const struct net_device_ops vrf_netdev_ops = { | |
831 | .ndo_init = vrf_dev_init, | |
832 | .ndo_uninit = vrf_dev_uninit, | |
833 | .ndo_start_xmit = vrf_xmit, | |
834 | .ndo_get_stats64 = vrf_get_stats64, | |
835 | .ndo_add_slave = vrf_add_slave, | |
836 | .ndo_del_slave = vrf_del_slave, | |
837 | }; | |
838 | ||
ee15ee5d DA |
839 | static u32 vrf_fib_table(const struct net_device *dev) |
840 | { | |
841 | struct net_vrf *vrf = netdev_priv(dev); | |
842 | ||
843 | return vrf->tb_id; | |
844 | } | |
845 | ||
73e20b76 DA |
846 | static int vrf_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb) |
847 | { | |
848 | return 0; | |
849 | } | |
850 | ||
851 | static struct sk_buff *vrf_rcv_nfhook(u8 pf, unsigned int hook, | |
852 | struct sk_buff *skb, | |
853 | struct net_device *dev) | |
854 | { | |
855 | struct net *net = dev_net(dev); | |
856 | ||
73e20b76 DA |
857 | if (NF_HOOK(pf, hook, net, NULL, skb, dev, NULL, vrf_rcv_finish) < 0) |
858 | skb = NULL; /* kfree_skb(skb) handled by nf code */ | |
859 | ||
860 | return skb; | |
861 | } | |
862 | ||
74b20582 DA |
863 | #if IS_ENABLED(CONFIG_IPV6) |
864 | /* neighbor handling is done with actual device; do not want | |
865 | * to flip skb->dev for those ndisc packets. This really fails | |
866 | * for multiple next protocols (e.g., NEXTHDR_HOP). But it is | |
867 | * a start. | |
868 | */ | |
869 | static bool ipv6_ndisc_frame(const struct sk_buff *skb) | |
870 | { | |
871 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
872 | bool rc = false; | |
873 | ||
874 | if (iph->nexthdr == NEXTHDR_ICMP) { | |
875 | const struct icmp6hdr *icmph; | |
876 | struct icmp6hdr _icmph; | |
877 | ||
878 | icmph = skb_header_pointer(skb, sizeof(*iph), | |
879 | sizeof(_icmph), &_icmph); | |
880 | if (!icmph) | |
881 | goto out; | |
882 | ||
883 | switch (icmph->icmp6_type) { | |
884 | case NDISC_ROUTER_SOLICITATION: | |
885 | case NDISC_ROUTER_ADVERTISEMENT: | |
886 | case NDISC_NEIGHBOUR_SOLICITATION: | |
887 | case NDISC_NEIGHBOUR_ADVERTISEMENT: | |
888 | case NDISC_REDIRECT: | |
889 | rc = true; | |
890 | break; | |
891 | } | |
892 | } | |
893 | ||
894 | out: | |
895 | return rc; | |
896 | } | |
897 | ||
9ff74384 DA |
898 | static struct rt6_info *vrf_ip6_route_lookup(struct net *net, |
899 | const struct net_device *dev, | |
900 | struct flowi6 *fl6, | |
901 | int ifindex, | |
902 | int flags) | |
903 | { | |
904 | struct net_vrf *vrf = netdev_priv(dev); | |
905 | struct fib6_table *table = NULL; | |
906 | struct rt6_info *rt6; | |
907 | ||
908 | rcu_read_lock(); | |
909 | ||
910 | /* fib6_table does not have a refcnt and can not be freed */ | |
911 | rt6 = rcu_dereference(vrf->rt6); | |
912 | if (likely(rt6)) | |
913 | table = rt6->rt6i_table; | |
914 | ||
915 | rcu_read_unlock(); | |
916 | ||
917 | if (!table) | |
918 | return NULL; | |
919 | ||
920 | return ip6_pol_route(net, table, ifindex, fl6, flags); | |
921 | } | |
922 | ||
923 | static void vrf_ip6_input_dst(struct sk_buff *skb, struct net_device *vrf_dev, | |
924 | int ifindex) | |
925 | { | |
926 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
927 | struct flowi6 fl6 = { | |
928 | .daddr = iph->daddr, | |
929 | .saddr = iph->saddr, | |
930 | .flowlabel = ip6_flowinfo(iph), | |
931 | .flowi6_mark = skb->mark, | |
932 | .flowi6_proto = iph->nexthdr, | |
933 | .flowi6_iif = ifindex, | |
934 | }; | |
935 | struct net *net = dev_net(vrf_dev); | |
936 | struct rt6_info *rt6; | |
937 | ||
938 | rt6 = vrf_ip6_route_lookup(net, vrf_dev, &fl6, ifindex, | |
939 | RT6_LOOKUP_F_HAS_SADDR | RT6_LOOKUP_F_IFACE); | |
940 | if (unlikely(!rt6)) | |
941 | return; | |
942 | ||
943 | if (unlikely(&rt6->dst == &net->ipv6.ip6_null_entry->dst)) | |
944 | return; | |
945 | ||
946 | skb_dst_set(skb, &rt6->dst); | |
947 | } | |
948 | ||
74b20582 DA |
949 | static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev, |
950 | struct sk_buff *skb) | |
951 | { | |
9ff74384 DA |
952 | int orig_iif = skb->skb_iif; |
953 | bool need_strict; | |
954 | ||
b4869aa2 DA |
955 | /* loopback traffic; do not push through packet taps again. |
956 | * Reset pkt_type for upper layers to process skb | |
957 | */ | |
958 | if (skb->pkt_type == PACKET_LOOPBACK) { | |
959 | skb->dev = vrf_dev; | |
960 | skb->skb_iif = vrf_dev->ifindex; | |
a04a480d | 961 | IP6CB(skb)->flags |= IP6SKB_L3SLAVE; |
b4869aa2 DA |
962 | skb->pkt_type = PACKET_HOST; |
963 | goto out; | |
964 | } | |
965 | ||
9ff74384 DA |
966 | /* if packet is NDISC or addressed to multicast or link-local |
967 | * then keep the ingress interface | |
968 | */ | |
969 | need_strict = rt6_need_strict(&ipv6_hdr(skb)->daddr); | |
970 | if (!ipv6_ndisc_frame(skb) && !need_strict) { | |
926d93a3 | 971 | vrf_rx_stats(vrf_dev, skb->len); |
74b20582 DA |
972 | skb->dev = vrf_dev; |
973 | skb->skb_iif = vrf_dev->ifindex; | |
974 | ||
975 | skb_push(skb, skb->mac_len); | |
976 | dev_queue_xmit_nit(skb, vrf_dev); | |
977 | skb_pull(skb, skb->mac_len); | |
978 | ||
979 | IP6CB(skb)->flags |= IP6SKB_L3SLAVE; | |
980 | } | |
981 | ||
9ff74384 DA |
982 | if (need_strict) |
983 | vrf_ip6_input_dst(skb, vrf_dev, orig_iif); | |
984 | ||
73e20b76 | 985 | skb = vrf_rcv_nfhook(NFPROTO_IPV6, NF_INET_PRE_ROUTING, skb, vrf_dev); |
b4869aa2 | 986 | out: |
74b20582 DA |
987 | return skb; |
988 | } | |
989 | ||
990 | #else | |
991 | static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev, | |
992 | struct sk_buff *skb) | |
993 | { | |
994 | return skb; | |
995 | } | |
996 | #endif | |
997 | ||
998 | static struct sk_buff *vrf_ip_rcv(struct net_device *vrf_dev, | |
999 | struct sk_buff *skb) | |
1000 | { | |
1001 | skb->dev = vrf_dev; | |
1002 | skb->skb_iif = vrf_dev->ifindex; | |
a04a480d | 1003 | IPCB(skb)->flags |= IPSKB_L3SLAVE; |
74b20582 | 1004 | |
e58e4159 DA |
1005 | if (ipv4_is_multicast(ip_hdr(skb)->daddr)) |
1006 | goto out; | |
1007 | ||
afe80a49 DA |
1008 | /* loopback traffic; do not push through packet taps again. |
1009 | * Reset pkt_type for upper layers to process skb | |
1010 | */ | |
1011 | if (skb->pkt_type == PACKET_LOOPBACK) { | |
1012 | skb->pkt_type = PACKET_HOST; | |
1013 | goto out; | |
1014 | } | |
1015 | ||
926d93a3 DA |
1016 | vrf_rx_stats(vrf_dev, skb->len); |
1017 | ||
74b20582 DA |
1018 | skb_push(skb, skb->mac_len); |
1019 | dev_queue_xmit_nit(skb, vrf_dev); | |
1020 | skb_pull(skb, skb->mac_len); | |
1021 | ||
73e20b76 | 1022 | skb = vrf_rcv_nfhook(NFPROTO_IPV4, NF_INET_PRE_ROUTING, skb, vrf_dev); |
afe80a49 | 1023 | out: |
74b20582 DA |
1024 | return skb; |
1025 | } | |
1026 | ||
1027 | /* called with rcu lock held */ | |
1028 | static struct sk_buff *vrf_l3_rcv(struct net_device *vrf_dev, | |
1029 | struct sk_buff *skb, | |
1030 | u16 proto) | |
1031 | { | |
1032 | switch (proto) { | |
1033 | case AF_INET: | |
1034 | return vrf_ip_rcv(vrf_dev, skb); | |
1035 | case AF_INET6: | |
1036 | return vrf_ip6_rcv(vrf_dev, skb); | |
1037 | } | |
1038 | ||
1039 | return skb; | |
1040 | } | |
1041 | ||
35402e31 | 1042 | #if IS_ENABLED(CONFIG_IPV6) |
4c1feac5 DA |
1043 | /* send to link-local or multicast address via interface enslaved to |
1044 | * VRF device. Force lookup to VRF table without changing flow struct | |
1045 | */ | |
1046 | static struct dst_entry *vrf_link_scope_lookup(const struct net_device *dev, | |
1047 | struct flowi6 *fl6) | |
35402e31 | 1048 | { |
9ff74384 | 1049 | struct net *net = dev_net(dev); |
4c1feac5 | 1050 | int flags = RT6_LOOKUP_F_IFACE; |
b0e95ccd | 1051 | struct dst_entry *dst = NULL; |
9ff74384 | 1052 | struct rt6_info *rt; |
35402e31 | 1053 | |
4c1feac5 DA |
1054 | /* VRF device does not have a link-local address and |
1055 | * sending packets to link-local or mcast addresses over | |
1056 | * a VRF device does not make sense | |
1057 | */ | |
1058 | if (fl6->flowi6_oif == dev->ifindex) { | |
1059 | dst = &net->ipv6.ip6_null_entry->dst; | |
1060 | dst_hold(dst); | |
1061 | return dst; | |
35402e31 DA |
1062 | } |
1063 | ||
4c1feac5 DA |
1064 | if (!ipv6_addr_any(&fl6->saddr)) |
1065 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
1066 | ||
1067 | rt = vrf_ip6_route_lookup(net, dev, fl6, fl6->flowi6_oif, flags); | |
1068 | if (rt) | |
1069 | dst = &rt->dst; | |
9ff74384 | 1070 | |
b0e95ccd | 1071 | return dst; |
35402e31 DA |
1072 | } |
1073 | #endif | |
1074 | ||
ee15ee5d DA |
1075 | static const struct l3mdev_ops vrf_l3mdev_ops = { |
1076 | .l3mdev_fib_table = vrf_fib_table, | |
74b20582 | 1077 | .l3mdev_l3_rcv = vrf_l3_rcv, |
ebfc102c | 1078 | .l3mdev_l3_out = vrf_l3_out, |
35402e31 | 1079 | #if IS_ENABLED(CONFIG_IPV6) |
4c1feac5 | 1080 | .l3mdev_link_scope_lookup = vrf_link_scope_lookup, |
35402e31 | 1081 | #endif |
ee15ee5d DA |
1082 | }; |
1083 | ||
193125db DA |
1084 | static void vrf_get_drvinfo(struct net_device *dev, |
1085 | struct ethtool_drvinfo *info) | |
1086 | { | |
1087 | strlcpy(info->driver, DRV_NAME, sizeof(info->driver)); | |
1088 | strlcpy(info->version, DRV_VERSION, sizeof(info->version)); | |
1089 | } | |
1090 | ||
1091 | static const struct ethtool_ops vrf_ethtool_ops = { | |
1092 | .get_drvinfo = vrf_get_drvinfo, | |
1093 | }; | |
1094 | ||
1aa6c4f6 DA |
1095 | static inline size_t vrf_fib_rule_nl_size(void) |
1096 | { | |
1097 | size_t sz; | |
1098 | ||
1099 | sz = NLMSG_ALIGN(sizeof(struct fib_rule_hdr)); | |
1100 | sz += nla_total_size(sizeof(u8)); /* FRA_L3MDEV */ | |
1101 | sz += nla_total_size(sizeof(u32)); /* FRA_PRIORITY */ | |
1102 | ||
1103 | return sz; | |
1104 | } | |
1105 | ||
1106 | static int vrf_fib_rule(const struct net_device *dev, __u8 family, bool add_it) | |
1107 | { | |
1108 | struct fib_rule_hdr *frh; | |
1109 | struct nlmsghdr *nlh; | |
1110 | struct sk_buff *skb; | |
1111 | int err; | |
1112 | ||
e4348637 DA |
1113 | if (family == AF_INET6 && !ipv6_mod_enabled()) |
1114 | return 0; | |
1115 | ||
1aa6c4f6 DA |
1116 | skb = nlmsg_new(vrf_fib_rule_nl_size(), GFP_KERNEL); |
1117 | if (!skb) | |
1118 | return -ENOMEM; | |
1119 | ||
1120 | nlh = nlmsg_put(skb, 0, 0, 0, sizeof(*frh), 0); | |
1121 | if (!nlh) | |
1122 | goto nla_put_failure; | |
1123 | ||
1124 | /* rule only needs to appear once */ | |
1125 | nlh->nlmsg_flags &= NLM_F_EXCL; | |
1126 | ||
1127 | frh = nlmsg_data(nlh); | |
1128 | memset(frh, 0, sizeof(*frh)); | |
1129 | frh->family = family; | |
1130 | frh->action = FR_ACT_TO_TBL; | |
1131 | ||
1132 | if (nla_put_u32(skb, FRA_L3MDEV, 1)) | |
1133 | goto nla_put_failure; | |
1134 | ||
1135 | if (nla_put_u32(skb, FRA_PRIORITY, FIB_RULE_PREF)) | |
1136 | goto nla_put_failure; | |
1137 | ||
1138 | nlmsg_end(skb, nlh); | |
1139 | ||
1140 | /* fib_nl_{new,del}rule handling looks for net from skb->sk */ | |
1141 | skb->sk = dev_net(dev)->rtnl; | |
1142 | if (add_it) { | |
1143 | err = fib_nl_newrule(skb, nlh); | |
1144 | if (err == -EEXIST) | |
1145 | err = 0; | |
1146 | } else { | |
1147 | err = fib_nl_delrule(skb, nlh); | |
1148 | if (err == -ENOENT) | |
1149 | err = 0; | |
1150 | } | |
1151 | nlmsg_free(skb); | |
1152 | ||
1153 | return err; | |
1154 | ||
1155 | nla_put_failure: | |
1156 | nlmsg_free(skb); | |
1157 | ||
1158 | return -EMSGSIZE; | |
1159 | } | |
1160 | ||
1161 | static int vrf_add_fib_rules(const struct net_device *dev) | |
1162 | { | |
1163 | int err; | |
1164 | ||
1165 | err = vrf_fib_rule(dev, AF_INET, true); | |
1166 | if (err < 0) | |
1167 | goto out_err; | |
1168 | ||
1169 | err = vrf_fib_rule(dev, AF_INET6, true); | |
1170 | if (err < 0) | |
1171 | goto ipv6_err; | |
1172 | ||
e58e4159 DA |
1173 | #if IS_ENABLED(CONFIG_IP_MROUTE_MULTIPLE_TABLES) |
1174 | err = vrf_fib_rule(dev, RTNL_FAMILY_IPMR, true); | |
1175 | if (err < 0) | |
1176 | goto ipmr_err; | |
1177 | #endif | |
1178 | ||
1aa6c4f6 DA |
1179 | return 0; |
1180 | ||
e58e4159 DA |
1181 | #if IS_ENABLED(CONFIG_IP_MROUTE_MULTIPLE_TABLES) |
1182 | ipmr_err: | |
1183 | vrf_fib_rule(dev, AF_INET6, false); | |
1184 | #endif | |
1185 | ||
1aa6c4f6 DA |
1186 | ipv6_err: |
1187 | vrf_fib_rule(dev, AF_INET, false); | |
1188 | ||
1189 | out_err: | |
1190 | netdev_err(dev, "Failed to add FIB rules.\n"); | |
1191 | return err; | |
1192 | } | |
1193 | ||
193125db DA |
1194 | static void vrf_setup(struct net_device *dev) |
1195 | { | |
1196 | ether_setup(dev); | |
1197 | ||
1198 | /* Initialize the device structure. */ | |
1199 | dev->netdev_ops = &vrf_netdev_ops; | |
ee15ee5d | 1200 | dev->l3mdev_ops = &vrf_l3mdev_ops; |
193125db DA |
1201 | dev->ethtool_ops = &vrf_ethtool_ops; |
1202 | dev->destructor = free_netdev; | |
1203 | ||
1204 | /* Fill in device structure with ethernet-generic values. */ | |
1205 | eth_hw_addr_random(dev); | |
1206 | ||
1207 | /* don't acquire vrf device's netif_tx_lock when transmitting */ | |
1208 | dev->features |= NETIF_F_LLTX; | |
1209 | ||
1210 | /* don't allow vrf devices to change network namespaces. */ | |
1211 | dev->features |= NETIF_F_NETNS_LOCAL; | |
7889681f DA |
1212 | |
1213 | /* does not make sense for a VLAN to be added to a vrf device */ | |
1214 | dev->features |= NETIF_F_VLAN_CHALLENGED; | |
1215 | ||
1216 | /* enable offload features */ | |
1217 | dev->features |= NETIF_F_GSO_SOFTWARE; | |
1218 | dev->features |= NETIF_F_RXCSUM | NETIF_F_HW_CSUM; | |
1219 | dev->features |= NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA; | |
1220 | ||
1221 | dev->hw_features = dev->features; | |
1222 | dev->hw_enc_features = dev->features; | |
1223 | ||
1224 | /* default to no qdisc; user can add if desired */ | |
1225 | dev->priv_flags |= IFF_NO_QUEUE; | |
193125db DA |
1226 | } |
1227 | ||
1228 | static int vrf_validate(struct nlattr *tb[], struct nlattr *data[]) | |
1229 | { | |
1230 | if (tb[IFLA_ADDRESS]) { | |
1231 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) | |
1232 | return -EINVAL; | |
1233 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) | |
1234 | return -EADDRNOTAVAIL; | |
1235 | } | |
1236 | return 0; | |
1237 | } | |
1238 | ||
1239 | static void vrf_dellink(struct net_device *dev, struct list_head *head) | |
1240 | { | |
193125db DA |
1241 | unregister_netdevice_queue(dev, head); |
1242 | } | |
1243 | ||
1244 | static int vrf_newlink(struct net *src_net, struct net_device *dev, | |
1245 | struct nlattr *tb[], struct nlattr *data[]) | |
1246 | { | |
1247 | struct net_vrf *vrf = netdev_priv(dev); | |
1aa6c4f6 | 1248 | int err; |
193125db DA |
1249 | |
1250 | if (!data || !data[IFLA_VRF_TABLE]) | |
1251 | return -EINVAL; | |
1252 | ||
1253 | vrf->tb_id = nla_get_u32(data[IFLA_VRF_TABLE]); | |
24c63bbc DA |
1254 | if (vrf->tb_id == RT_TABLE_UNSPEC) |
1255 | return -EINVAL; | |
193125db | 1256 | |
007979ea | 1257 | dev->priv_flags |= IFF_L3MDEV_MASTER; |
193125db | 1258 | |
1aa6c4f6 DA |
1259 | err = register_netdevice(dev); |
1260 | if (err) | |
1261 | goto out; | |
1262 | ||
1263 | if (add_fib_rules) { | |
1264 | err = vrf_add_fib_rules(dev); | |
1265 | if (err) { | |
1266 | unregister_netdevice(dev); | |
1267 | goto out; | |
1268 | } | |
1269 | add_fib_rules = false; | |
1270 | } | |
1271 | ||
1272 | out: | |
1273 | return err; | |
193125db DA |
1274 | } |
1275 | ||
1276 | static size_t vrf_nl_getsize(const struct net_device *dev) | |
1277 | { | |
1278 | return nla_total_size(sizeof(u32)); /* IFLA_VRF_TABLE */ | |
1279 | } | |
1280 | ||
1281 | static int vrf_fillinfo(struct sk_buff *skb, | |
1282 | const struct net_device *dev) | |
1283 | { | |
1284 | struct net_vrf *vrf = netdev_priv(dev); | |
1285 | ||
1286 | return nla_put_u32(skb, IFLA_VRF_TABLE, vrf->tb_id); | |
1287 | } | |
1288 | ||
67eb0331 DA |
1289 | static size_t vrf_get_slave_size(const struct net_device *bond_dev, |
1290 | const struct net_device *slave_dev) | |
1291 | { | |
1292 | return nla_total_size(sizeof(u32)); /* IFLA_VRF_PORT_TABLE */ | |
1293 | } | |
1294 | ||
1295 | static int vrf_fill_slave_info(struct sk_buff *skb, | |
1296 | const struct net_device *vrf_dev, | |
1297 | const struct net_device *slave_dev) | |
1298 | { | |
1299 | struct net_vrf *vrf = netdev_priv(vrf_dev); | |
1300 | ||
1301 | if (nla_put_u32(skb, IFLA_VRF_PORT_TABLE, vrf->tb_id)) | |
1302 | return -EMSGSIZE; | |
1303 | ||
1304 | return 0; | |
1305 | } | |
1306 | ||
193125db DA |
1307 | static const struct nla_policy vrf_nl_policy[IFLA_VRF_MAX + 1] = { |
1308 | [IFLA_VRF_TABLE] = { .type = NLA_U32 }, | |
1309 | }; | |
1310 | ||
1311 | static struct rtnl_link_ops vrf_link_ops __read_mostly = { | |
1312 | .kind = DRV_NAME, | |
1313 | .priv_size = sizeof(struct net_vrf), | |
1314 | ||
1315 | .get_size = vrf_nl_getsize, | |
1316 | .policy = vrf_nl_policy, | |
1317 | .validate = vrf_validate, | |
1318 | .fill_info = vrf_fillinfo, | |
1319 | ||
67eb0331 DA |
1320 | .get_slave_size = vrf_get_slave_size, |
1321 | .fill_slave_info = vrf_fill_slave_info, | |
1322 | ||
193125db DA |
1323 | .newlink = vrf_newlink, |
1324 | .dellink = vrf_dellink, | |
1325 | .setup = vrf_setup, | |
1326 | .maxtype = IFLA_VRF_MAX, | |
1327 | }; | |
1328 | ||
1329 | static int vrf_device_event(struct notifier_block *unused, | |
1330 | unsigned long event, void *ptr) | |
1331 | { | |
1332 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
1333 | ||
1334 | /* only care about unregister events to drop slave references */ | |
1335 | if (event == NETDEV_UNREGISTER) { | |
193125db DA |
1336 | struct net_device *vrf_dev; |
1337 | ||
fee6d4c7 | 1338 | if (!netif_is_l3_slave(dev)) |
193125db DA |
1339 | goto out; |
1340 | ||
58aa9087 NA |
1341 | vrf_dev = netdev_master_upper_dev_get(dev); |
1342 | vrf_del_slave(vrf_dev, dev); | |
193125db DA |
1343 | } |
1344 | out: | |
1345 | return NOTIFY_DONE; | |
1346 | } | |
1347 | ||
1348 | static struct notifier_block vrf_notifier_block __read_mostly = { | |
1349 | .notifier_call = vrf_device_event, | |
1350 | }; | |
1351 | ||
1352 | static int __init vrf_init_module(void) | |
1353 | { | |
1354 | int rc; | |
1355 | ||
193125db DA |
1356 | register_netdevice_notifier(&vrf_notifier_block); |
1357 | ||
1358 | rc = rtnl_link_register(&vrf_link_ops); | |
1359 | if (rc < 0) | |
1360 | goto error; | |
1361 | ||
1362 | return 0; | |
1363 | ||
1364 | error: | |
1365 | unregister_netdevice_notifier(&vrf_notifier_block); | |
193125db DA |
1366 | return rc; |
1367 | } | |
1368 | ||
193125db | 1369 | module_init(vrf_init_module); |
193125db DA |
1370 | MODULE_AUTHOR("Shrijeet Mukherjee, David Ahern"); |
1371 | MODULE_DESCRIPTION("Device driver to instantiate VRF domains"); | |
1372 | MODULE_LICENSE("GPL"); | |
1373 | MODULE_ALIAS_RTNL_LINK(DRV_NAME); | |
1374 | MODULE_VERSION(DRV_VERSION); |