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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> |
193125db | 38 | |
8cbb512c DA |
39 | #define RT_FL_TOS(oldflp4) \ |
40 | ((oldflp4)->flowi4_tos & (IPTOS_RT_MASK | RTO_ONLINK)) | |
41 | ||
193125db DA |
42 | #define DRV_NAME "vrf" |
43 | #define DRV_VERSION "1.0" | |
44 | ||
ec539514 | 45 | struct net_vrf { |
b0e95ccd | 46 | struct rtable __rcu *rth; |
671cd19a | 47 | struct rtable __rcu *rth_local; |
b0e95ccd | 48 | struct rt6_info __rcu *rt6; |
625b47b5 | 49 | struct rt6_info __rcu *rt6_local; |
ec539514 DA |
50 | u32 tb_id; |
51 | }; | |
52 | ||
193125db DA |
53 | struct pcpu_dstats { |
54 | u64 tx_pkts; | |
55 | u64 tx_bytes; | |
56 | u64 tx_drps; | |
57 | u64 rx_pkts; | |
58 | u64 rx_bytes; | |
671cd19a | 59 | u64 rx_drps; |
193125db DA |
60 | struct u64_stats_sync syncp; |
61 | }; | |
62 | ||
671cd19a DA |
63 | static void vrf_rx_stats(struct net_device *dev, int len) |
64 | { | |
65 | struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats); | |
66 | ||
67 | u64_stats_update_begin(&dstats->syncp); | |
68 | dstats->rx_pkts++; | |
69 | dstats->rx_bytes += len; | |
70 | u64_stats_update_end(&dstats->syncp); | |
71 | } | |
72 | ||
57b8efa1 NA |
73 | static void vrf_tx_error(struct net_device *vrf_dev, struct sk_buff *skb) |
74 | { | |
75 | vrf_dev->stats.tx_errors++; | |
76 | kfree_skb(skb); | |
77 | } | |
78 | ||
193125db DA |
79 | static struct rtnl_link_stats64 *vrf_get_stats64(struct net_device *dev, |
80 | struct rtnl_link_stats64 *stats) | |
81 | { | |
82 | int i; | |
83 | ||
84 | for_each_possible_cpu(i) { | |
85 | const struct pcpu_dstats *dstats; | |
86 | u64 tbytes, tpkts, tdrops, rbytes, rpkts; | |
87 | unsigned int start; | |
88 | ||
89 | dstats = per_cpu_ptr(dev->dstats, i); | |
90 | do { | |
91 | start = u64_stats_fetch_begin_irq(&dstats->syncp); | |
92 | tbytes = dstats->tx_bytes; | |
93 | tpkts = dstats->tx_pkts; | |
94 | tdrops = dstats->tx_drps; | |
95 | rbytes = dstats->rx_bytes; | |
96 | rpkts = dstats->rx_pkts; | |
97 | } while (u64_stats_fetch_retry_irq(&dstats->syncp, start)); | |
98 | stats->tx_bytes += tbytes; | |
99 | stats->tx_packets += tpkts; | |
100 | stats->tx_dropped += tdrops; | |
101 | stats->rx_bytes += rbytes; | |
102 | stats->rx_packets += rpkts; | |
103 | } | |
104 | return stats; | |
105 | } | |
106 | ||
671cd19a 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 DA |
135 | #if IS_ENABLED(CONFIG_IPV6) |
136 | static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb, | |
137 | struct net_device *dev) | |
138 | { | |
139 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
140 | struct net *net = dev_net(skb->dev); | |
141 | struct flowi6 fl6 = { | |
142 | /* needed to match OIF rule */ | |
143 | .flowi6_oif = dev->ifindex, | |
144 | .flowi6_iif = LOOPBACK_IFINDEX, | |
145 | .daddr = iph->daddr, | |
146 | .saddr = iph->saddr, | |
147 | .flowlabel = ip6_flowinfo(iph), | |
148 | .flowi6_mark = skb->mark, | |
149 | .flowi6_proto = iph->nexthdr, | |
150 | .flowi6_flags = FLOWI_FLAG_L3MDEV_SRC | FLOWI_FLAG_SKIP_NH_OIF, | |
151 | }; | |
152 | int ret = NET_XMIT_DROP; | |
153 | struct dst_entry *dst; | |
154 | struct dst_entry *dst_null = &net->ipv6.ip6_null_entry->dst; | |
155 | ||
156 | dst = ip6_route_output(net, NULL, &fl6); | |
157 | if (dst == dst_null) | |
158 | goto err; | |
159 | ||
160 | skb_dst_drop(skb); | |
625b47b5 DA |
161 | |
162 | /* if dst.dev is loopback or the VRF device again this is locally | |
163 | * originated traffic destined to a local address. Short circuit | |
164 | * to Rx path using our local dst | |
165 | */ | |
166 | if (dst->dev == net->loopback_dev || dst->dev == dev) { | |
167 | struct net_vrf *vrf = netdev_priv(dev); | |
168 | struct rt6_info *rt6_local; | |
169 | ||
170 | /* release looked up dst and use cached local dst */ | |
171 | dst_release(dst); | |
172 | ||
173 | rcu_read_lock(); | |
174 | ||
175 | rt6_local = rcu_dereference(vrf->rt6_local); | |
176 | if (unlikely(!rt6_local)) { | |
177 | rcu_read_unlock(); | |
178 | goto err; | |
179 | } | |
180 | ||
181 | /* Ordering issue: cached local dst is created on newlink | |
182 | * before the IPv6 initialization. Using the local dst | |
183 | * requires rt6i_idev to be set so make sure it is. | |
184 | */ | |
185 | if (unlikely(!rt6_local->rt6i_idev)) { | |
186 | rt6_local->rt6i_idev = in6_dev_get(dev); | |
187 | if (!rt6_local->rt6i_idev) { | |
188 | rcu_read_unlock(); | |
189 | goto err; | |
190 | } | |
191 | } | |
192 | ||
193 | dst = &rt6_local->dst; | |
194 | dst_hold(dst); | |
195 | ||
196 | rcu_read_unlock(); | |
197 | ||
198 | return vrf_local_xmit(skb, dev, &rt6_local->dst); | |
199 | } | |
200 | ||
35402e31 DA |
201 | skb_dst_set(skb, dst); |
202 | ||
09fcf916 DA |
203 | /* strip the ethernet header added for pass through VRF device */ |
204 | __skb_pull(skb, skb_network_offset(skb)); | |
205 | ||
35402e31 DA |
206 | ret = ip6_local_out(net, skb->sk, skb); |
207 | if (unlikely(net_xmit_eval(ret))) | |
208 | dev->stats.tx_errors++; | |
209 | else | |
210 | ret = NET_XMIT_SUCCESS; | |
211 | ||
212 | return ret; | |
213 | err: | |
214 | vrf_tx_error(dev, skb); | |
215 | return NET_XMIT_DROP; | |
216 | } | |
217 | #else | |
193125db DA |
218 | static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb, |
219 | struct net_device *dev) | |
220 | { | |
57b8efa1 NA |
221 | vrf_tx_error(dev, skb); |
222 | return NET_XMIT_DROP; | |
193125db | 223 | } |
35402e31 | 224 | #endif |
193125db | 225 | |
193125db DA |
226 | static netdev_tx_t vrf_process_v4_outbound(struct sk_buff *skb, |
227 | struct net_device *vrf_dev) | |
228 | { | |
229 | struct iphdr *ip4h = ip_hdr(skb); | |
230 | int ret = NET_XMIT_DROP; | |
231 | struct flowi4 fl4 = { | |
232 | /* needed to match OIF rule */ | |
233 | .flowi4_oif = vrf_dev->ifindex, | |
234 | .flowi4_iif = LOOPBACK_IFINDEX, | |
235 | .flowi4_tos = RT_TOS(ip4h->tos), | |
6e2895a8 | 236 | .flowi4_flags = FLOWI_FLAG_ANYSRC | FLOWI_FLAG_L3MDEV_SRC | |
58189ca7 | 237 | FLOWI_FLAG_SKIP_NH_OIF, |
193125db DA |
238 | .daddr = ip4h->daddr, |
239 | }; | |
09fcf916 DA |
240 | struct net *net = dev_net(vrf_dev); |
241 | struct rtable *rt; | |
242 | ||
243 | rt = ip_route_output_flow(net, &fl4, NULL); | |
244 | if (IS_ERR(rt)) | |
245 | goto err; | |
193125db | 246 | |
09fcf916 DA |
247 | if (rt->rt_type != RTN_UNICAST && rt->rt_type != RTN_LOCAL) { |
248 | ip_rt_put(rt); | |
193125db | 249 | goto err; |
09fcf916 DA |
250 | } |
251 | ||
252 | skb_dst_drop(skb); | |
671cd19a DA |
253 | |
254 | /* if dst.dev is loopback or the VRF device again this is locally | |
255 | * originated traffic destined to a local address. Short circuit | |
256 | * to Rx path using our local dst | |
257 | */ | |
258 | if (rt->dst.dev == net->loopback_dev || rt->dst.dev == vrf_dev) { | |
259 | struct net_vrf *vrf = netdev_priv(vrf_dev); | |
260 | struct rtable *rth_local; | |
261 | struct dst_entry *dst = NULL; | |
262 | ||
263 | ip_rt_put(rt); | |
264 | ||
265 | rcu_read_lock(); | |
266 | ||
267 | rth_local = rcu_dereference(vrf->rth_local); | |
268 | if (likely(rth_local)) { | |
269 | dst = &rth_local->dst; | |
270 | dst_hold(dst); | |
271 | } | |
272 | ||
273 | rcu_read_unlock(); | |
274 | ||
275 | if (unlikely(!dst)) | |
276 | goto err; | |
277 | ||
278 | return vrf_local_xmit(skb, vrf_dev, dst); | |
279 | } | |
280 | ||
09fcf916 DA |
281 | skb_dst_set(skb, &rt->dst); |
282 | ||
283 | /* strip the ethernet header added for pass through VRF device */ | |
284 | __skb_pull(skb, skb_network_offset(skb)); | |
193125db DA |
285 | |
286 | if (!ip4h->saddr) { | |
287 | ip4h->saddr = inet_select_addr(skb_dst(skb)->dev, 0, | |
288 | RT_SCOPE_LINK); | |
289 | } | |
290 | ||
33224b16 | 291 | ret = ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb); |
193125db DA |
292 | if (unlikely(net_xmit_eval(ret))) |
293 | vrf_dev->stats.tx_errors++; | |
294 | else | |
295 | ret = NET_XMIT_SUCCESS; | |
296 | ||
297 | out: | |
298 | return ret; | |
299 | err: | |
57b8efa1 | 300 | vrf_tx_error(vrf_dev, skb); |
193125db DA |
301 | goto out; |
302 | } | |
303 | ||
304 | static netdev_tx_t is_ip_tx_frame(struct sk_buff *skb, struct net_device *dev) | |
305 | { | |
306 | switch (skb->protocol) { | |
307 | case htons(ETH_P_IP): | |
308 | return vrf_process_v4_outbound(skb, dev); | |
309 | case htons(ETH_P_IPV6): | |
310 | return vrf_process_v6_outbound(skb, dev); | |
311 | default: | |
57b8efa1 | 312 | vrf_tx_error(dev, skb); |
193125db DA |
313 | return NET_XMIT_DROP; |
314 | } | |
315 | } | |
316 | ||
317 | static netdev_tx_t vrf_xmit(struct sk_buff *skb, struct net_device *dev) | |
318 | { | |
319 | netdev_tx_t ret = is_ip_tx_frame(skb, dev); | |
320 | ||
321 | if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { | |
322 | struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats); | |
323 | ||
324 | u64_stats_update_begin(&dstats->syncp); | |
325 | dstats->tx_pkts++; | |
326 | dstats->tx_bytes += skb->len; | |
327 | u64_stats_update_end(&dstats->syncp); | |
328 | } else { | |
329 | this_cpu_inc(dev->dstats->tx_drps); | |
330 | } | |
331 | ||
332 | return ret; | |
333 | } | |
334 | ||
35402e31 | 335 | #if IS_ENABLED(CONFIG_IPV6) |
35402e31 DA |
336 | /* modelled after ip6_finish_output2 */ |
337 | static int vrf_finish_output6(struct net *net, struct sock *sk, | |
338 | struct sk_buff *skb) | |
339 | { | |
340 | struct dst_entry *dst = skb_dst(skb); | |
341 | struct net_device *dev = dst->dev; | |
342 | struct neighbour *neigh; | |
343 | struct in6_addr *nexthop; | |
344 | int ret; | |
345 | ||
346 | skb->protocol = htons(ETH_P_IPV6); | |
347 | skb->dev = dev; | |
348 | ||
349 | rcu_read_lock_bh(); | |
350 | nexthop = rt6_nexthop((struct rt6_info *)dst, &ipv6_hdr(skb)->daddr); | |
351 | neigh = __ipv6_neigh_lookup_noref(dst->dev, nexthop); | |
352 | if (unlikely(!neigh)) | |
353 | neigh = __neigh_create(&nd_tbl, nexthop, dst->dev, false); | |
354 | if (!IS_ERR(neigh)) { | |
355 | ret = dst_neigh_output(dst, neigh, skb); | |
356 | rcu_read_unlock_bh(); | |
357 | return ret; | |
358 | } | |
359 | rcu_read_unlock_bh(); | |
360 | ||
361 | IP6_INC_STATS(dev_net(dst->dev), | |
362 | ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES); | |
363 | kfree_skb(skb); | |
364 | return -EINVAL; | |
365 | } | |
366 | ||
367 | /* modelled after ip6_output */ | |
368 | static int vrf_output6(struct net *net, struct sock *sk, struct sk_buff *skb) | |
369 | { | |
370 | return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING, | |
371 | net, sk, skb, NULL, skb_dst(skb)->dev, | |
372 | vrf_finish_output6, | |
373 | !(IP6CB(skb)->flags & IP6SKB_REROUTED)); | |
374 | } | |
375 | ||
b0e95ccd | 376 | /* holding rtnl */ |
9ab179d8 | 377 | static void vrf_rt6_release(struct net_vrf *vrf) |
35402e31 | 378 | { |
b0e95ccd | 379 | struct rt6_info *rt6 = rtnl_dereference(vrf->rt6); |
625b47b5 | 380 | struct rt6_info *rt6_local = rtnl_dereference(vrf->rt6_local); |
b0e95ccd | 381 | |
625b47b5 DA |
382 | RCU_INIT_POINTER(vrf->rt6, NULL); |
383 | RCU_INIT_POINTER(vrf->rt6_local, NULL); | |
384 | synchronize_rcu(); | |
b0e95ccd DA |
385 | |
386 | if (rt6) | |
387 | dst_release(&rt6->dst); | |
625b47b5 DA |
388 | |
389 | if (rt6_local) { | |
390 | if (rt6_local->rt6i_idev) | |
391 | in6_dev_put(rt6_local->rt6i_idev); | |
392 | ||
393 | dst_release(&rt6_local->dst); | |
394 | } | |
35402e31 DA |
395 | } |
396 | ||
397 | static int vrf_rt6_create(struct net_device *dev) | |
398 | { | |
625b47b5 | 399 | int flags = DST_HOST | DST_NOPOLICY | DST_NOXFRM | DST_NOCACHE; |
35402e31 | 400 | struct net_vrf *vrf = netdev_priv(dev); |
9ab179d8 | 401 | struct net *net = dev_net(dev); |
b3b4663c | 402 | struct fib6_table *rt6i_table; |
625b47b5 | 403 | struct rt6_info *rt6, *rt6_local; |
35402e31 DA |
404 | int rc = -ENOMEM; |
405 | ||
b3b4663c DA |
406 | rt6i_table = fib6_new_table(net, vrf->tb_id); |
407 | if (!rt6i_table) | |
408 | goto out; | |
409 | ||
625b47b5 DA |
410 | /* create a dst for routing packets out a VRF device */ |
411 | rt6 = ip6_dst_alloc(net, dev, flags); | |
35402e31 DA |
412 | if (!rt6) |
413 | goto out; | |
414 | ||
9ab179d8 | 415 | dst_hold(&rt6->dst); |
b3b4663c DA |
416 | |
417 | rt6->rt6i_table = rt6i_table; | |
418 | rt6->dst.output = vrf_output6; | |
625b47b5 DA |
419 | |
420 | /* create a dst for local routing - packets sent locally | |
421 | * to local address via the VRF device as a loopback | |
422 | */ | |
423 | rt6_local = ip6_dst_alloc(net, dev, flags); | |
424 | if (!rt6_local) { | |
425 | dst_release(&rt6->dst); | |
426 | goto out; | |
427 | } | |
428 | ||
429 | dst_hold(&rt6_local->dst); | |
430 | ||
431 | rt6_local->rt6i_idev = in6_dev_get(dev); | |
432 | rt6_local->rt6i_flags = RTF_UP | RTF_NONEXTHOP | RTF_LOCAL; | |
433 | rt6_local->rt6i_table = rt6i_table; | |
434 | rt6_local->dst.input = ip6_input; | |
435 | ||
b0e95ccd | 436 | rcu_assign_pointer(vrf->rt6, rt6); |
625b47b5 | 437 | rcu_assign_pointer(vrf->rt6_local, rt6_local); |
b0e95ccd | 438 | |
35402e31 DA |
439 | rc = 0; |
440 | out: | |
441 | return rc; | |
442 | } | |
443 | #else | |
9ab179d8 | 444 | static void vrf_rt6_release(struct net_vrf *vrf) |
35402e31 DA |
445 | { |
446 | } | |
447 | ||
448 | static int vrf_rt6_create(struct net_device *dev) | |
449 | { | |
450 | return 0; | |
451 | } | |
452 | #endif | |
453 | ||
8f58336d | 454 | /* modelled after ip_finish_output2 */ |
0c4b51f0 | 455 | static int vrf_finish_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
193125db | 456 | { |
8f58336d DA |
457 | struct dst_entry *dst = skb_dst(skb); |
458 | struct rtable *rt = (struct rtable *)dst; | |
459 | struct net_device *dev = dst->dev; | |
460 | unsigned int hh_len = LL_RESERVED_SPACE(dev); | |
461 | struct neighbour *neigh; | |
462 | u32 nexthop; | |
463 | int ret = -EINVAL; | |
464 | ||
465 | /* Be paranoid, rather than too clever. */ | |
466 | if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) { | |
467 | struct sk_buff *skb2; | |
468 | ||
469 | skb2 = skb_realloc_headroom(skb, LL_RESERVED_SPACE(dev)); | |
470 | if (!skb2) { | |
471 | ret = -ENOMEM; | |
472 | goto err; | |
473 | } | |
474 | if (skb->sk) | |
475 | skb_set_owner_w(skb2, skb->sk); | |
476 | ||
477 | consume_skb(skb); | |
478 | skb = skb2; | |
479 | } | |
480 | ||
481 | rcu_read_lock_bh(); | |
482 | ||
483 | nexthop = (__force u32)rt_nexthop(rt, ip_hdr(skb)->daddr); | |
484 | neigh = __ipv4_neigh_lookup_noref(dev, nexthop); | |
485 | if (unlikely(!neigh)) | |
486 | neigh = __neigh_create(&arp_tbl, &nexthop, dev, false); | |
487 | if (!IS_ERR(neigh)) | |
488 | ret = dst_neigh_output(dst, neigh, skb); | |
489 | ||
490 | rcu_read_unlock_bh(); | |
491 | err: | |
492 | if (unlikely(ret < 0)) | |
493 | vrf_tx_error(skb->dev, skb); | |
494 | return ret; | |
193125db DA |
495 | } |
496 | ||
ede2059d | 497 | static int vrf_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
193125db DA |
498 | { |
499 | struct net_device *dev = skb_dst(skb)->dev; | |
500 | ||
29a26a56 | 501 | IP_UPD_PO_STATS(net, IPSTATS_MIB_OUT, skb->len); |
193125db DA |
502 | |
503 | skb->dev = dev; | |
504 | skb->protocol = htons(ETH_P_IP); | |
505 | ||
29a26a56 EB |
506 | return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING, |
507 | net, sk, skb, NULL, dev, | |
8f58336d | 508 | vrf_finish_output, |
193125db DA |
509 | !(IPCB(skb)->flags & IPSKB_REROUTED)); |
510 | } | |
511 | ||
b0e95ccd | 512 | /* holding rtnl */ |
9ab179d8 | 513 | static void vrf_rtable_release(struct net_vrf *vrf) |
193125db | 514 | { |
b0e95ccd | 515 | struct rtable *rth = rtnl_dereference(vrf->rth); |
671cd19a | 516 | struct rtable *rth_local = rtnl_dereference(vrf->rth_local); |
b0e95ccd | 517 | |
671cd19a DA |
518 | RCU_INIT_POINTER(vrf->rth, NULL); |
519 | RCU_INIT_POINTER(vrf->rth_local, NULL); | |
520 | synchronize_rcu(); | |
193125db | 521 | |
b0e95ccd DA |
522 | if (rth) |
523 | dst_release(&rth->dst); | |
671cd19a DA |
524 | |
525 | if (rth_local) | |
526 | dst_release(&rth_local->dst); | |
193125db DA |
527 | } |
528 | ||
b0e95ccd | 529 | static int vrf_rtable_create(struct net_device *dev) |
193125db | 530 | { |
b7503e0c | 531 | struct net_vrf *vrf = netdev_priv(dev); |
671cd19a | 532 | struct rtable *rth, *rth_local; |
193125db | 533 | |
b3b4663c | 534 | if (!fib_new_table(dev_net(dev), vrf->tb_id)) |
b0e95ccd | 535 | return -ENOMEM; |
b3b4663c | 536 | |
671cd19a | 537 | /* create a dst for routing packets out through a VRF device */ |
9ab179d8 | 538 | rth = rt_dst_alloc(dev, 0, RTN_UNICAST, 1, 1, 0); |
b0e95ccd DA |
539 | if (!rth) |
540 | return -ENOMEM; | |
193125db | 541 | |
671cd19a DA |
542 | /* create a dst for local ingress routing - packets sent locally |
543 | * to local address via the VRF device as a loopback | |
544 | */ | |
545 | rth_local = rt_dst_alloc(dev, RTCF_LOCAL, RTN_LOCAL, 1, 1, 0); | |
546 | if (!rth_local) { | |
547 | dst_release(&rth->dst); | |
548 | return -ENOMEM; | |
549 | } | |
550 | ||
b0e95ccd DA |
551 | rth->dst.output = vrf_output; |
552 | rth->rt_table_id = vrf->tb_id; | |
553 | ||
671cd19a DA |
554 | rth_local->rt_table_id = vrf->tb_id; |
555 | ||
b0e95ccd | 556 | rcu_assign_pointer(vrf->rth, rth); |
671cd19a | 557 | rcu_assign_pointer(vrf->rth_local, rth_local); |
b0e95ccd DA |
558 | |
559 | return 0; | |
193125db DA |
560 | } |
561 | ||
562 | /**************************** device handling ********************/ | |
563 | ||
564 | /* cycle interface to flush neighbor cache and move routes across tables */ | |
565 | static void cycle_netdev(struct net_device *dev) | |
566 | { | |
567 | unsigned int flags = dev->flags; | |
568 | int ret; | |
569 | ||
570 | if (!netif_running(dev)) | |
571 | return; | |
572 | ||
573 | ret = dev_change_flags(dev, flags & ~IFF_UP); | |
574 | if (ret >= 0) | |
575 | ret = dev_change_flags(dev, flags); | |
576 | ||
577 | if (ret < 0) { | |
578 | netdev_err(dev, | |
579 | "Failed to cycle device %s; route tables might be wrong!\n", | |
580 | dev->name); | |
581 | } | |
582 | } | |
583 | ||
193125db DA |
584 | static int do_vrf_add_slave(struct net_device *dev, struct net_device *port_dev) |
585 | { | |
bad53162 | 586 | int ret; |
193125db | 587 | |
29bf24af | 588 | ret = netdev_master_upper_dev_link(port_dev, dev, NULL, NULL); |
193125db | 589 | if (ret < 0) |
74b20582 | 590 | return ret; |
193125db | 591 | |
fee6d4c7 | 592 | port_dev->priv_flags |= IFF_L3MDEV_SLAVE; |
193125db DA |
593 | cycle_netdev(port_dev); |
594 | ||
595 | return 0; | |
193125db DA |
596 | } |
597 | ||
598 | static int vrf_add_slave(struct net_device *dev, struct net_device *port_dev) | |
599 | { | |
fee6d4c7 | 600 | if (netif_is_l3_master(port_dev) || netif_is_l3_slave(port_dev)) |
193125db DA |
601 | return -EINVAL; |
602 | ||
603 | return do_vrf_add_slave(dev, port_dev); | |
604 | } | |
605 | ||
606 | /* inverse of do_vrf_add_slave */ | |
607 | static int do_vrf_del_slave(struct net_device *dev, struct net_device *port_dev) | |
608 | { | |
193125db | 609 | netdev_upper_dev_unlink(port_dev, dev); |
fee6d4c7 | 610 | port_dev->priv_flags &= ~IFF_L3MDEV_SLAVE; |
193125db | 611 | |
193125db DA |
612 | cycle_netdev(port_dev); |
613 | ||
193125db DA |
614 | return 0; |
615 | } | |
616 | ||
617 | static int vrf_del_slave(struct net_device *dev, struct net_device *port_dev) | |
618 | { | |
193125db DA |
619 | return do_vrf_del_slave(dev, port_dev); |
620 | } | |
621 | ||
622 | static void vrf_dev_uninit(struct net_device *dev) | |
623 | { | |
624 | struct net_vrf *vrf = netdev_priv(dev); | |
bad53162 NA |
625 | struct net_device *port_dev; |
626 | struct list_head *iter; | |
193125db | 627 | |
9ab179d8 DA |
628 | vrf_rtable_release(vrf); |
629 | vrf_rt6_release(vrf); | |
193125db | 630 | |
bad53162 NA |
631 | netdev_for_each_lower_dev(dev, port_dev, iter) |
632 | vrf_del_slave(dev, port_dev); | |
193125db | 633 | |
3a4a27d3 | 634 | free_percpu(dev->dstats); |
193125db DA |
635 | dev->dstats = NULL; |
636 | } | |
637 | ||
638 | static int vrf_dev_init(struct net_device *dev) | |
639 | { | |
640 | struct net_vrf *vrf = netdev_priv(dev); | |
641 | ||
193125db DA |
642 | dev->dstats = netdev_alloc_pcpu_stats(struct pcpu_dstats); |
643 | if (!dev->dstats) | |
644 | goto out_nomem; | |
645 | ||
646 | /* create the default dst which points back to us */ | |
b0e95ccd | 647 | if (vrf_rtable_create(dev) != 0) |
193125db DA |
648 | goto out_stats; |
649 | ||
35402e31 DA |
650 | if (vrf_rt6_create(dev) != 0) |
651 | goto out_rth; | |
652 | ||
193125db DA |
653 | dev->flags = IFF_MASTER | IFF_NOARP; |
654 | ||
b87ab6b8 DA |
655 | /* MTU is irrelevant for VRF device; set to 64k similar to lo */ |
656 | dev->mtu = 64 * 1024; | |
657 | ||
658 | /* similarly, oper state is irrelevant; set to up to avoid confusion */ | |
659 | dev->operstate = IF_OPER_UP; | |
660 | ||
193125db DA |
661 | return 0; |
662 | ||
35402e31 | 663 | out_rth: |
9ab179d8 | 664 | vrf_rtable_release(vrf); |
193125db DA |
665 | out_stats: |
666 | free_percpu(dev->dstats); | |
667 | dev->dstats = NULL; | |
668 | out_nomem: | |
669 | return -ENOMEM; | |
670 | } | |
671 | ||
672 | static const struct net_device_ops vrf_netdev_ops = { | |
673 | .ndo_init = vrf_dev_init, | |
674 | .ndo_uninit = vrf_dev_uninit, | |
675 | .ndo_start_xmit = vrf_xmit, | |
676 | .ndo_get_stats64 = vrf_get_stats64, | |
677 | .ndo_add_slave = vrf_add_slave, | |
678 | .ndo_del_slave = vrf_del_slave, | |
679 | }; | |
680 | ||
ee15ee5d DA |
681 | static u32 vrf_fib_table(const struct net_device *dev) |
682 | { | |
683 | struct net_vrf *vrf = netdev_priv(dev); | |
684 | ||
685 | return vrf->tb_id; | |
686 | } | |
687 | ||
688 | static struct rtable *vrf_get_rtable(const struct net_device *dev, | |
689 | const struct flowi4 *fl4) | |
690 | { | |
691 | struct rtable *rth = NULL; | |
692 | ||
6e2895a8 | 693 | if (!(fl4->flowi4_flags & FLOWI_FLAG_L3MDEV_SRC)) { |
ee15ee5d DA |
694 | struct net_vrf *vrf = netdev_priv(dev); |
695 | ||
b0e95ccd DA |
696 | rcu_read_lock(); |
697 | ||
698 | rth = rcu_dereference(vrf->rth); | |
699 | if (likely(rth)) | |
700 | dst_hold(&rth->dst); | |
701 | ||
702 | rcu_read_unlock(); | |
ee15ee5d DA |
703 | } |
704 | ||
705 | return rth; | |
706 | } | |
707 | ||
8cbb512c | 708 | /* called under rcu_read_lock */ |
b5bdacf3 | 709 | static int vrf_get_saddr(struct net_device *dev, struct flowi4 *fl4) |
8cbb512c DA |
710 | { |
711 | struct fib_result res = { .tclassid = 0 }; | |
712 | struct net *net = dev_net(dev); | |
713 | u32 orig_tos = fl4->flowi4_tos; | |
714 | u8 flags = fl4->flowi4_flags; | |
715 | u8 scope = fl4->flowi4_scope; | |
716 | u8 tos = RT_FL_TOS(fl4); | |
b5bdacf3 | 717 | int rc; |
8cbb512c DA |
718 | |
719 | if (unlikely(!fl4->daddr)) | |
b5bdacf3 | 720 | return 0; |
8cbb512c DA |
721 | |
722 | fl4->flowi4_flags |= FLOWI_FLAG_SKIP_NH_OIF; | |
723 | fl4->flowi4_iif = LOOPBACK_IFINDEX; | |
1ff23bee DA |
724 | /* make sure oif is set to VRF device for lookup */ |
725 | fl4->flowi4_oif = dev->ifindex; | |
8cbb512c DA |
726 | fl4->flowi4_tos = tos & IPTOS_RT_MASK; |
727 | fl4->flowi4_scope = ((tos & RTO_ONLINK) ? | |
728 | RT_SCOPE_LINK : RT_SCOPE_UNIVERSE); | |
729 | ||
b5bdacf3 DA |
730 | rc = fib_lookup(net, fl4, &res, 0); |
731 | if (!rc) { | |
8cbb512c DA |
732 | if (res.type == RTN_LOCAL) |
733 | fl4->saddr = res.fi->fib_prefsrc ? : fl4->daddr; | |
734 | else | |
735 | fib_select_path(net, &res, fl4, -1); | |
736 | } | |
737 | ||
738 | fl4->flowi4_flags = flags; | |
739 | fl4->flowi4_tos = orig_tos; | |
740 | fl4->flowi4_scope = scope; | |
b5bdacf3 DA |
741 | |
742 | return rc; | |
8cbb512c DA |
743 | } |
744 | ||
74b20582 DA |
745 | #if IS_ENABLED(CONFIG_IPV6) |
746 | /* neighbor handling is done with actual device; do not want | |
747 | * to flip skb->dev for those ndisc packets. This really fails | |
748 | * for multiple next protocols (e.g., NEXTHDR_HOP). But it is | |
749 | * a start. | |
750 | */ | |
751 | static bool ipv6_ndisc_frame(const struct sk_buff *skb) | |
752 | { | |
753 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
754 | bool rc = false; | |
755 | ||
756 | if (iph->nexthdr == NEXTHDR_ICMP) { | |
757 | const struct icmp6hdr *icmph; | |
758 | struct icmp6hdr _icmph; | |
759 | ||
760 | icmph = skb_header_pointer(skb, sizeof(*iph), | |
761 | sizeof(_icmph), &_icmph); | |
762 | if (!icmph) | |
763 | goto out; | |
764 | ||
765 | switch (icmph->icmp6_type) { | |
766 | case NDISC_ROUTER_SOLICITATION: | |
767 | case NDISC_ROUTER_ADVERTISEMENT: | |
768 | case NDISC_NEIGHBOUR_SOLICITATION: | |
769 | case NDISC_NEIGHBOUR_ADVERTISEMENT: | |
770 | case NDISC_REDIRECT: | |
771 | rc = true; | |
772 | break; | |
773 | } | |
774 | } | |
775 | ||
776 | out: | |
777 | return rc; | |
778 | } | |
779 | ||
780 | static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev, | |
781 | struct sk_buff *skb) | |
782 | { | |
625b47b5 DA |
783 | /* loopback traffic; do not push through packet taps again. |
784 | * Reset pkt_type for upper layers to process skb | |
785 | */ | |
786 | if (skb->pkt_type == PACKET_LOOPBACK) { | |
787 | skb->dev = vrf_dev; | |
788 | skb->skb_iif = vrf_dev->ifindex; | |
789 | skb->pkt_type = PACKET_HOST; | |
790 | goto out; | |
791 | } | |
792 | ||
74b20582 DA |
793 | /* if packet is NDISC keep the ingress interface */ |
794 | if (!ipv6_ndisc_frame(skb)) { | |
795 | skb->dev = vrf_dev; | |
796 | skb->skb_iif = vrf_dev->ifindex; | |
797 | ||
798 | skb_push(skb, skb->mac_len); | |
799 | dev_queue_xmit_nit(skb, vrf_dev); | |
800 | skb_pull(skb, skb->mac_len); | |
801 | ||
802 | IP6CB(skb)->flags |= IP6SKB_L3SLAVE; | |
803 | } | |
804 | ||
625b47b5 | 805 | out: |
74b20582 DA |
806 | return skb; |
807 | } | |
808 | ||
809 | #else | |
810 | static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev, | |
811 | struct sk_buff *skb) | |
812 | { | |
813 | return skb; | |
814 | } | |
815 | #endif | |
816 | ||
817 | static struct sk_buff *vrf_ip_rcv(struct net_device *vrf_dev, | |
818 | struct sk_buff *skb) | |
819 | { | |
820 | skb->dev = vrf_dev; | |
821 | skb->skb_iif = vrf_dev->ifindex; | |
822 | ||
671cd19a DA |
823 | /* loopback traffic; do not push through packet taps again. |
824 | * Reset pkt_type for upper layers to process skb | |
825 | */ | |
826 | if (skb->pkt_type == PACKET_LOOPBACK) { | |
827 | skb->pkt_type = PACKET_HOST; | |
828 | goto out; | |
829 | } | |
830 | ||
74b20582 DA |
831 | skb_push(skb, skb->mac_len); |
832 | dev_queue_xmit_nit(skb, vrf_dev); | |
833 | skb_pull(skb, skb->mac_len); | |
834 | ||
671cd19a | 835 | out: |
74b20582 DA |
836 | return skb; |
837 | } | |
838 | ||
839 | /* called with rcu lock held */ | |
840 | static struct sk_buff *vrf_l3_rcv(struct net_device *vrf_dev, | |
841 | struct sk_buff *skb, | |
842 | u16 proto) | |
843 | { | |
844 | switch (proto) { | |
845 | case AF_INET: | |
846 | return vrf_ip_rcv(vrf_dev, skb); | |
847 | case AF_INET6: | |
848 | return vrf_ip6_rcv(vrf_dev, skb); | |
849 | } | |
850 | ||
851 | return skb; | |
852 | } | |
853 | ||
35402e31 DA |
854 | #if IS_ENABLED(CONFIG_IPV6) |
855 | static struct dst_entry *vrf_get_rt6_dst(const struct net_device *dev, | |
856 | const struct flowi6 *fl6) | |
857 | { | |
b0e95ccd | 858 | struct dst_entry *dst = NULL; |
35402e31 DA |
859 | |
860 | if (!(fl6->flowi6_flags & FLOWI_FLAG_L3MDEV_SRC)) { | |
861 | struct net_vrf *vrf = netdev_priv(dev); | |
b0e95ccd DA |
862 | struct rt6_info *rt; |
863 | ||
864 | rcu_read_lock(); | |
865 | ||
866 | rt = rcu_dereference(vrf->rt6); | |
867 | if (likely(rt)) { | |
868 | dst = &rt->dst; | |
869 | dst_hold(dst); | |
870 | } | |
35402e31 | 871 | |
b0e95ccd | 872 | rcu_read_unlock(); |
35402e31 DA |
873 | } |
874 | ||
b0e95ccd | 875 | return dst; |
35402e31 DA |
876 | } |
877 | #endif | |
878 | ||
ee15ee5d DA |
879 | static const struct l3mdev_ops vrf_l3mdev_ops = { |
880 | .l3mdev_fib_table = vrf_fib_table, | |
881 | .l3mdev_get_rtable = vrf_get_rtable, | |
8cbb512c | 882 | .l3mdev_get_saddr = vrf_get_saddr, |
74b20582 | 883 | .l3mdev_l3_rcv = vrf_l3_rcv, |
35402e31 DA |
884 | #if IS_ENABLED(CONFIG_IPV6) |
885 | .l3mdev_get_rt6_dst = vrf_get_rt6_dst, | |
886 | #endif | |
ee15ee5d DA |
887 | }; |
888 | ||
193125db DA |
889 | static void vrf_get_drvinfo(struct net_device *dev, |
890 | struct ethtool_drvinfo *info) | |
891 | { | |
892 | strlcpy(info->driver, DRV_NAME, sizeof(info->driver)); | |
893 | strlcpy(info->version, DRV_VERSION, sizeof(info->version)); | |
894 | } | |
895 | ||
896 | static const struct ethtool_ops vrf_ethtool_ops = { | |
897 | .get_drvinfo = vrf_get_drvinfo, | |
898 | }; | |
899 | ||
900 | static void vrf_setup(struct net_device *dev) | |
901 | { | |
902 | ether_setup(dev); | |
903 | ||
904 | /* Initialize the device structure. */ | |
905 | dev->netdev_ops = &vrf_netdev_ops; | |
ee15ee5d | 906 | dev->l3mdev_ops = &vrf_l3mdev_ops; |
193125db DA |
907 | dev->ethtool_ops = &vrf_ethtool_ops; |
908 | dev->destructor = free_netdev; | |
909 | ||
910 | /* Fill in device structure with ethernet-generic values. */ | |
911 | eth_hw_addr_random(dev); | |
912 | ||
913 | /* don't acquire vrf device's netif_tx_lock when transmitting */ | |
914 | dev->features |= NETIF_F_LLTX; | |
915 | ||
916 | /* don't allow vrf devices to change network namespaces. */ | |
917 | dev->features |= NETIF_F_NETNS_LOCAL; | |
918 | } | |
919 | ||
920 | static int vrf_validate(struct nlattr *tb[], struct nlattr *data[]) | |
921 | { | |
922 | if (tb[IFLA_ADDRESS]) { | |
923 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) | |
924 | return -EINVAL; | |
925 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) | |
926 | return -EADDRNOTAVAIL; | |
927 | } | |
928 | return 0; | |
929 | } | |
930 | ||
931 | static void vrf_dellink(struct net_device *dev, struct list_head *head) | |
932 | { | |
193125db DA |
933 | unregister_netdevice_queue(dev, head); |
934 | } | |
935 | ||
936 | static int vrf_newlink(struct net *src_net, struct net_device *dev, | |
937 | struct nlattr *tb[], struct nlattr *data[]) | |
938 | { | |
939 | struct net_vrf *vrf = netdev_priv(dev); | |
193125db DA |
940 | |
941 | if (!data || !data[IFLA_VRF_TABLE]) | |
942 | return -EINVAL; | |
943 | ||
944 | vrf->tb_id = nla_get_u32(data[IFLA_VRF_TABLE]); | |
945 | ||
007979ea | 946 | dev->priv_flags |= IFF_L3MDEV_MASTER; |
193125db | 947 | |
7f109f7c | 948 | return register_netdevice(dev); |
193125db DA |
949 | } |
950 | ||
951 | static size_t vrf_nl_getsize(const struct net_device *dev) | |
952 | { | |
953 | return nla_total_size(sizeof(u32)); /* IFLA_VRF_TABLE */ | |
954 | } | |
955 | ||
956 | static int vrf_fillinfo(struct sk_buff *skb, | |
957 | const struct net_device *dev) | |
958 | { | |
959 | struct net_vrf *vrf = netdev_priv(dev); | |
960 | ||
961 | return nla_put_u32(skb, IFLA_VRF_TABLE, vrf->tb_id); | |
962 | } | |
963 | ||
67eb0331 DA |
964 | static size_t vrf_get_slave_size(const struct net_device *bond_dev, |
965 | const struct net_device *slave_dev) | |
966 | { | |
967 | return nla_total_size(sizeof(u32)); /* IFLA_VRF_PORT_TABLE */ | |
968 | } | |
969 | ||
970 | static int vrf_fill_slave_info(struct sk_buff *skb, | |
971 | const struct net_device *vrf_dev, | |
972 | const struct net_device *slave_dev) | |
973 | { | |
974 | struct net_vrf *vrf = netdev_priv(vrf_dev); | |
975 | ||
976 | if (nla_put_u32(skb, IFLA_VRF_PORT_TABLE, vrf->tb_id)) | |
977 | return -EMSGSIZE; | |
978 | ||
979 | return 0; | |
980 | } | |
981 | ||
193125db DA |
982 | static const struct nla_policy vrf_nl_policy[IFLA_VRF_MAX + 1] = { |
983 | [IFLA_VRF_TABLE] = { .type = NLA_U32 }, | |
984 | }; | |
985 | ||
986 | static struct rtnl_link_ops vrf_link_ops __read_mostly = { | |
987 | .kind = DRV_NAME, | |
988 | .priv_size = sizeof(struct net_vrf), | |
989 | ||
990 | .get_size = vrf_nl_getsize, | |
991 | .policy = vrf_nl_policy, | |
992 | .validate = vrf_validate, | |
993 | .fill_info = vrf_fillinfo, | |
994 | ||
67eb0331 DA |
995 | .get_slave_size = vrf_get_slave_size, |
996 | .fill_slave_info = vrf_fill_slave_info, | |
997 | ||
193125db DA |
998 | .newlink = vrf_newlink, |
999 | .dellink = vrf_dellink, | |
1000 | .setup = vrf_setup, | |
1001 | .maxtype = IFLA_VRF_MAX, | |
1002 | }; | |
1003 | ||
1004 | static int vrf_device_event(struct notifier_block *unused, | |
1005 | unsigned long event, void *ptr) | |
1006 | { | |
1007 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
1008 | ||
1009 | /* only care about unregister events to drop slave references */ | |
1010 | if (event == NETDEV_UNREGISTER) { | |
193125db DA |
1011 | struct net_device *vrf_dev; |
1012 | ||
fee6d4c7 | 1013 | if (!netif_is_l3_slave(dev)) |
193125db DA |
1014 | goto out; |
1015 | ||
58aa9087 NA |
1016 | vrf_dev = netdev_master_upper_dev_get(dev); |
1017 | vrf_del_slave(vrf_dev, dev); | |
193125db DA |
1018 | } |
1019 | out: | |
1020 | return NOTIFY_DONE; | |
1021 | } | |
1022 | ||
1023 | static struct notifier_block vrf_notifier_block __read_mostly = { | |
1024 | .notifier_call = vrf_device_event, | |
1025 | }; | |
1026 | ||
1027 | static int __init vrf_init_module(void) | |
1028 | { | |
1029 | int rc; | |
1030 | ||
193125db DA |
1031 | register_netdevice_notifier(&vrf_notifier_block); |
1032 | ||
1033 | rc = rtnl_link_register(&vrf_link_ops); | |
1034 | if (rc < 0) | |
1035 | goto error; | |
1036 | ||
1037 | return 0; | |
1038 | ||
1039 | error: | |
1040 | unregister_netdevice_notifier(&vrf_notifier_block); | |
193125db DA |
1041 | return rc; |
1042 | } | |
1043 | ||
193125db | 1044 | module_init(vrf_init_module); |
193125db DA |
1045 | MODULE_AUTHOR("Shrijeet Mukherjee, David Ahern"); |
1046 | MODULE_DESCRIPTION("Device driver to instantiate VRF domains"); | |
1047 | MODULE_LICENSE("GPL"); | |
1048 | MODULE_ALIAS_RTNL_LINK(DRV_NAME); | |
1049 | MODULE_VERSION(DRV_VERSION); |