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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> |
097d3c95 | 39 | #include <net/netns/generic.h> |
193125db DA |
40 | |
41 | #define DRV_NAME "vrf" | |
42 | #define DRV_VERSION "1.0" | |
43 | ||
1aa6c4f6 | 44 | #define FIB_RULE_PREF 1000 /* default preference for FIB rules */ |
097d3c95 DA |
45 | |
46 | static unsigned int vrf_net_id; | |
1aa6c4f6 | 47 | |
ec539514 | 48 | struct net_vrf { |
b0e95ccd DA |
49 | struct rtable __rcu *rth; |
50 | struct rt6_info __rcu *rt6; | |
43b059a3 DA |
51 | #if IS_ENABLED(CONFIG_IPV6) |
52 | struct fib6_table *fib6_table; | |
53 | #endif | |
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 | ||
bc1f4470 | 83 | static void vrf_get_stats64(struct net_device *dev, |
84 | struct rtnl_link_stats64 *stats) | |
193125db DA |
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 | } | |
193125db DA |
108 | } |
109 | ||
dcdd43c4 DA |
110 | /* by default VRF devices do not have a qdisc and are expected |
111 | * to be created with only a single queue. | |
112 | */ | |
113 | static bool qdisc_tx_is_default(const struct net_device *dev) | |
114 | { | |
115 | struct netdev_queue *txq; | |
116 | struct Qdisc *qdisc; | |
117 | ||
118 | if (dev->num_tx_queues > 1) | |
119 | return false; | |
120 | ||
121 | txq = netdev_get_tx_queue(dev, 0); | |
122 | qdisc = rcu_access_pointer(txq->qdisc); | |
123 | ||
124 | return !qdisc->enqueue; | |
125 | } | |
126 | ||
afe80a49 DA |
127 | /* Local traffic destined to local address. Reinsert the packet to rx |
128 | * path, similar to loopback handling. | |
129 | */ | |
130 | static int vrf_local_xmit(struct sk_buff *skb, struct net_device *dev, | |
131 | struct dst_entry *dst) | |
132 | { | |
133 | int len = skb->len; | |
134 | ||
135 | skb_orphan(skb); | |
136 | ||
137 | skb_dst_set(skb, dst); | |
afe80a49 DA |
138 | |
139 | /* set pkt_type to avoid skb hitting packet taps twice - | |
140 | * once on Tx and again in Rx processing | |
141 | */ | |
142 | skb->pkt_type = PACKET_LOOPBACK; | |
143 | ||
144 | skb->protocol = eth_type_trans(skb, dev); | |
145 | ||
146 | if (likely(netif_rx(skb) == NET_RX_SUCCESS)) | |
147 | vrf_rx_stats(dev, len); | |
148 | else | |
149 | this_cpu_inc(dev->dstats->rx_drps); | |
150 | ||
151 | return NETDEV_TX_OK; | |
152 | } | |
153 | ||
35402e31 | 154 | #if IS_ENABLED(CONFIG_IPV6) |
4c1feac5 DA |
155 | static int vrf_ip6_local_out(struct net *net, struct sock *sk, |
156 | struct sk_buff *skb) | |
157 | { | |
158 | int err; | |
159 | ||
160 | err = nf_hook(NFPROTO_IPV6, NF_INET_LOCAL_OUT, net, | |
161 | sk, skb, NULL, skb_dst(skb)->dev, dst_output); | |
162 | ||
163 | if (likely(err == 1)) | |
164 | err = dst_output(net, sk, skb); | |
165 | ||
166 | return err; | |
167 | } | |
168 | ||
35402e31 DA |
169 | static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb, |
170 | struct net_device *dev) | |
171 | { | |
172 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
173 | struct net *net = dev_net(skb->dev); | |
174 | struct flowi6 fl6 = { | |
175 | /* needed to match OIF rule */ | |
176 | .flowi6_oif = dev->ifindex, | |
177 | .flowi6_iif = LOOPBACK_IFINDEX, | |
178 | .daddr = iph->daddr, | |
179 | .saddr = iph->saddr, | |
180 | .flowlabel = ip6_flowinfo(iph), | |
181 | .flowi6_mark = skb->mark, | |
182 | .flowi6_proto = iph->nexthdr, | |
c71ad3d4 | 183 | .flowi6_flags = FLOWI_FLAG_SKIP_NH_OIF, |
35402e31 DA |
184 | }; |
185 | int ret = NET_XMIT_DROP; | |
186 | struct dst_entry *dst; | |
187 | struct dst_entry *dst_null = &net->ipv6.ip6_null_entry->dst; | |
188 | ||
189 | dst = ip6_route_output(net, NULL, &fl6); | |
190 | if (dst == dst_null) | |
191 | goto err; | |
192 | ||
193 | skb_dst_drop(skb); | |
b4869aa2 DA |
194 | |
195 | /* if dst.dev is loopback or the VRF device again this is locally | |
196 | * originated traffic destined to a local address. Short circuit | |
4f04256c | 197 | * to Rx path |
b4869aa2 | 198 | */ |
4f04256c DA |
199 | if (dst->dev == dev) |
200 | return vrf_local_xmit(skb, dev, dst); | |
b4869aa2 | 201 | |
35402e31 DA |
202 | skb_dst_set(skb, dst); |
203 | ||
911a66fb DA |
204 | /* strip the ethernet header added for pass through VRF device */ |
205 | __skb_pull(skb, skb_network_offset(skb)); | |
206 | ||
4c1feac5 | 207 | ret = vrf_ip6_local_out(net, skb->sk, skb); |
35402e31 DA |
208 | if (unlikely(net_xmit_eval(ret))) |
209 | dev->stats.tx_errors++; | |
210 | else | |
211 | ret = NET_XMIT_SUCCESS; | |
212 | ||
213 | return ret; | |
214 | err: | |
215 | vrf_tx_error(dev, skb); | |
216 | return NET_XMIT_DROP; | |
217 | } | |
218 | #else | |
193125db DA |
219 | static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb, |
220 | struct net_device *dev) | |
221 | { | |
57b8efa1 NA |
222 | vrf_tx_error(dev, skb); |
223 | return NET_XMIT_DROP; | |
193125db | 224 | } |
35402e31 | 225 | #endif |
193125db | 226 | |
ebfc102c DA |
227 | /* based on ip_local_out; can't use it b/c the dst is switched pointing to us */ |
228 | static int vrf_ip_local_out(struct net *net, struct sock *sk, | |
229 | struct sk_buff *skb) | |
230 | { | |
231 | int err; | |
232 | ||
233 | err = nf_hook(NFPROTO_IPV4, NF_INET_LOCAL_OUT, net, sk, | |
234 | skb, NULL, skb_dst(skb)->dev, dst_output); | |
235 | if (likely(err == 1)) | |
236 | err = dst_output(net, sk, skb); | |
237 | ||
238 | return err; | |
239 | } | |
240 | ||
193125db DA |
241 | static netdev_tx_t vrf_process_v4_outbound(struct sk_buff *skb, |
242 | struct net_device *vrf_dev) | |
243 | { | |
244 | struct iphdr *ip4h = ip_hdr(skb); | |
245 | int ret = NET_XMIT_DROP; | |
246 | struct flowi4 fl4 = { | |
247 | /* needed to match OIF rule */ | |
248 | .flowi4_oif = vrf_dev->ifindex, | |
249 | .flowi4_iif = LOOPBACK_IFINDEX, | |
250 | .flowi4_tos = RT_TOS(ip4h->tos), | |
c71ad3d4 | 251 | .flowi4_flags = FLOWI_FLAG_ANYSRC | FLOWI_FLAG_SKIP_NH_OIF, |
7a18c5b9 | 252 | .flowi4_proto = ip4h->protocol, |
193125db | 253 | .daddr = ip4h->daddr, |
7a18c5b9 | 254 | .saddr = ip4h->saddr, |
193125db | 255 | }; |
911a66fb DA |
256 | struct net *net = dev_net(vrf_dev); |
257 | struct rtable *rt; | |
258 | ||
259 | rt = ip_route_output_flow(net, &fl4, NULL); | |
260 | if (IS_ERR(rt)) | |
261 | goto err; | |
193125db | 262 | |
911a66fb | 263 | skb_dst_drop(skb); |
afe80a49 DA |
264 | |
265 | /* if dst.dev is loopback or the VRF device again this is locally | |
266 | * originated traffic destined to a local address. Short circuit | |
4f04256c | 267 | * to Rx path |
afe80a49 | 268 | */ |
4f04256c DA |
269 | if (rt->dst.dev == vrf_dev) |
270 | return vrf_local_xmit(skb, vrf_dev, &rt->dst); | |
afe80a49 | 271 | |
911a66fb DA |
272 | skb_dst_set(skb, &rt->dst); |
273 | ||
274 | /* strip the ethernet header added for pass through VRF device */ | |
275 | __skb_pull(skb, skb_network_offset(skb)); | |
193125db DA |
276 | |
277 | if (!ip4h->saddr) { | |
278 | ip4h->saddr = inet_select_addr(skb_dst(skb)->dev, 0, | |
279 | RT_SCOPE_LINK); | |
280 | } | |
281 | ||
ebfc102c | 282 | ret = vrf_ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb); |
193125db DA |
283 | if (unlikely(net_xmit_eval(ret))) |
284 | vrf_dev->stats.tx_errors++; | |
285 | else | |
286 | ret = NET_XMIT_SUCCESS; | |
287 | ||
288 | out: | |
289 | return ret; | |
290 | err: | |
57b8efa1 | 291 | vrf_tx_error(vrf_dev, skb); |
193125db DA |
292 | goto out; |
293 | } | |
294 | ||
295 | static netdev_tx_t is_ip_tx_frame(struct sk_buff *skb, struct net_device *dev) | |
296 | { | |
297 | switch (skb->protocol) { | |
298 | case htons(ETH_P_IP): | |
299 | return vrf_process_v4_outbound(skb, dev); | |
300 | case htons(ETH_P_IPV6): | |
301 | return vrf_process_v6_outbound(skb, dev); | |
302 | default: | |
57b8efa1 | 303 | vrf_tx_error(dev, skb); |
193125db DA |
304 | return NET_XMIT_DROP; |
305 | } | |
306 | } | |
307 | ||
308 | static netdev_tx_t vrf_xmit(struct sk_buff *skb, struct net_device *dev) | |
309 | { | |
f7887d40 | 310 | int len = skb->len; |
193125db DA |
311 | netdev_tx_t ret = is_ip_tx_frame(skb, dev); |
312 | ||
313 | if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { | |
314 | struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats); | |
315 | ||
316 | u64_stats_update_begin(&dstats->syncp); | |
317 | dstats->tx_pkts++; | |
f7887d40 | 318 | dstats->tx_bytes += len; |
193125db DA |
319 | u64_stats_update_end(&dstats->syncp); |
320 | } else { | |
321 | this_cpu_inc(dev->dstats->tx_drps); | |
322 | } | |
323 | ||
324 | return ret; | |
325 | } | |
326 | ||
dcdd43c4 DA |
327 | static int vrf_finish_direct(struct net *net, struct sock *sk, |
328 | struct sk_buff *skb) | |
329 | { | |
330 | struct net_device *vrf_dev = skb->dev; | |
331 | ||
332 | if (!list_empty(&vrf_dev->ptype_all) && | |
333 | likely(skb_headroom(skb) >= ETH_HLEN)) { | |
d58ff351 | 334 | struct ethhdr *eth = skb_push(skb, ETH_HLEN); |
dcdd43c4 DA |
335 | |
336 | ether_addr_copy(eth->h_source, vrf_dev->dev_addr); | |
337 | eth_zero_addr(eth->h_dest); | |
338 | eth->h_proto = skb->protocol; | |
339 | ||
340 | rcu_read_lock_bh(); | |
341 | dev_queue_xmit_nit(skb, vrf_dev); | |
342 | rcu_read_unlock_bh(); | |
343 | ||
344 | skb_pull(skb, ETH_HLEN); | |
345 | } | |
346 | ||
347 | return 1; | |
348 | } | |
349 | ||
35402e31 | 350 | #if IS_ENABLED(CONFIG_IPV6) |
35402e31 DA |
351 | /* modelled after ip6_finish_output2 */ |
352 | static int vrf_finish_output6(struct net *net, struct sock *sk, | |
353 | struct sk_buff *skb) | |
354 | { | |
355 | struct dst_entry *dst = skb_dst(skb); | |
356 | struct net_device *dev = dst->dev; | |
357 | struct neighbour *neigh; | |
358 | struct in6_addr *nexthop; | |
359 | int ret; | |
360 | ||
eb63ecc1 DA |
361 | nf_reset(skb); |
362 | ||
35402e31 DA |
363 | skb->protocol = htons(ETH_P_IPV6); |
364 | skb->dev = dev; | |
365 | ||
366 | rcu_read_lock_bh(); | |
367 | nexthop = rt6_nexthop((struct rt6_info *)dst, &ipv6_hdr(skb)->daddr); | |
368 | neigh = __ipv6_neigh_lookup_noref(dst->dev, nexthop); | |
369 | if (unlikely(!neigh)) | |
370 | neigh = __neigh_create(&nd_tbl, nexthop, dst->dev, false); | |
371 | if (!IS_ERR(neigh)) { | |
4ff06203 | 372 | sock_confirm_neigh(skb, neigh); |
c16ec185 | 373 | ret = neigh_output(neigh, skb); |
35402e31 DA |
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 | ||
4c1feac5 DA |
394 | /* set dst on skb to send packet to us via dev_xmit path. Allows |
395 | * packet to go through device based features such as qdisc, netfilter | |
396 | * hooks and packet sockets with skb->dev set to vrf device. | |
397 | */ | |
a9ec54d1 DA |
398 | static struct sk_buff *vrf_ip6_out_redirect(struct net_device *vrf_dev, |
399 | struct sk_buff *skb) | |
4c1feac5 DA |
400 | { |
401 | struct net_vrf *vrf = netdev_priv(vrf_dev); | |
402 | struct dst_entry *dst = NULL; | |
403 | struct rt6_info *rt6; | |
404 | ||
4c1feac5 DA |
405 | rcu_read_lock(); |
406 | ||
407 | rt6 = rcu_dereference(vrf->rt6); | |
408 | if (likely(rt6)) { | |
409 | dst = &rt6->dst; | |
410 | dst_hold(dst); | |
411 | } | |
412 | ||
413 | rcu_read_unlock(); | |
414 | ||
415 | if (unlikely(!dst)) { | |
416 | vrf_tx_error(vrf_dev, skb); | |
417 | return NULL; | |
418 | } | |
419 | ||
420 | skb_dst_drop(skb); | |
421 | skb_dst_set(skb, dst); | |
422 | ||
423 | return skb; | |
424 | } | |
425 | ||
a9ec54d1 DA |
426 | static int vrf_output6_direct(struct net *net, struct sock *sk, |
427 | struct sk_buff *skb) | |
428 | { | |
429 | skb->protocol = htons(ETH_P_IPV6); | |
430 | ||
431 | return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING, | |
432 | net, sk, skb, NULL, skb->dev, | |
433 | vrf_finish_direct, | |
434 | !(IPCB(skb)->flags & IPSKB_REROUTED)); | |
435 | } | |
436 | ||
437 | static struct sk_buff *vrf_ip6_out_direct(struct net_device *vrf_dev, | |
438 | struct sock *sk, | |
439 | struct sk_buff *skb) | |
440 | { | |
441 | struct net *net = dev_net(vrf_dev); | |
442 | int err; | |
443 | ||
444 | skb->dev = vrf_dev; | |
445 | ||
446 | err = nf_hook(NFPROTO_IPV6, NF_INET_LOCAL_OUT, net, sk, | |
447 | skb, NULL, vrf_dev, vrf_output6_direct); | |
448 | ||
449 | if (likely(err == 1)) | |
450 | err = vrf_output6_direct(net, sk, skb); | |
451 | ||
452 | /* reset skb device */ | |
453 | if (likely(err == 1)) | |
454 | nf_reset(skb); | |
455 | else | |
456 | skb = NULL; | |
457 | ||
458 | return skb; | |
459 | } | |
460 | ||
461 | static struct sk_buff *vrf_ip6_out(struct net_device *vrf_dev, | |
462 | struct sock *sk, | |
463 | struct sk_buff *skb) | |
464 | { | |
465 | /* don't divert link scope packets */ | |
466 | if (rt6_need_strict(&ipv6_hdr(skb)->daddr)) | |
467 | return skb; | |
468 | ||
469 | if (qdisc_tx_is_default(vrf_dev)) | |
470 | return vrf_ip6_out_direct(vrf_dev, sk, skb); | |
471 | ||
472 | return vrf_ip6_out_redirect(vrf_dev, skb); | |
473 | } | |
474 | ||
b0e95ccd | 475 | /* holding rtnl */ |
810e530b | 476 | static void vrf_rt6_release(struct net_device *dev, struct net_vrf *vrf) |
35402e31 | 477 | { |
b0e95ccd | 478 | struct rt6_info *rt6 = rtnl_dereference(vrf->rt6); |
810e530b DA |
479 | struct net *net = dev_net(dev); |
480 | struct dst_entry *dst; | |
b0e95ccd | 481 | |
b4869aa2 | 482 | RCU_INIT_POINTER(vrf->rt6, NULL); |
b4869aa2 | 483 | synchronize_rcu(); |
b0e95ccd | 484 | |
810e530b DA |
485 | /* move dev in dst's to loopback so this VRF device can be deleted |
486 | * - based on dst_ifdown | |
487 | */ | |
488 | if (rt6) { | |
489 | dst = &rt6->dst; | |
490 | dev_put(dst->dev); | |
491 | dst->dev = net->loopback_dev; | |
492 | dev_hold(dst->dev); | |
493 | dst_release(dst); | |
494 | } | |
35402e31 DA |
495 | } |
496 | ||
497 | static int vrf_rt6_create(struct net_device *dev) | |
498 | { | |
a4c2fd7f | 499 | int flags = DST_HOST | DST_NOPOLICY | DST_NOXFRM; |
35402e31 | 500 | struct net_vrf *vrf = netdev_priv(dev); |
9ab179d8 | 501 | struct net *net = dev_net(dev); |
4f04256c | 502 | struct rt6_info *rt6; |
35402e31 DA |
503 | int rc = -ENOMEM; |
504 | ||
e4348637 DA |
505 | /* IPv6 can be CONFIG enabled and then disabled runtime */ |
506 | if (!ipv6_mod_enabled()) | |
507 | return 0; | |
508 | ||
43b059a3 DA |
509 | vrf->fib6_table = fib6_new_table(net, vrf->tb_id); |
510 | if (!vrf->fib6_table) | |
b3b4663c DA |
511 | goto out; |
512 | ||
b4869aa2 DA |
513 | /* create a dst for routing packets out a VRF device */ |
514 | rt6 = ip6_dst_alloc(net, dev, flags); | |
35402e31 DA |
515 | if (!rt6) |
516 | goto out; | |
517 | ||
b3b4663c | 518 | rt6->dst.output = vrf_output6; |
b4869aa2 | 519 | |
b0e95ccd DA |
520 | rcu_assign_pointer(vrf->rt6, rt6); |
521 | ||
35402e31 DA |
522 | rc = 0; |
523 | out: | |
524 | return rc; | |
525 | } | |
526 | #else | |
4c1feac5 DA |
527 | static struct sk_buff *vrf_ip6_out(struct net_device *vrf_dev, |
528 | struct sock *sk, | |
529 | struct sk_buff *skb) | |
530 | { | |
531 | return skb; | |
532 | } | |
533 | ||
810e530b | 534 | static void vrf_rt6_release(struct net_device *dev, struct net_vrf *vrf) |
35402e31 DA |
535 | { |
536 | } | |
537 | ||
538 | static int vrf_rt6_create(struct net_device *dev) | |
539 | { | |
540 | return 0; | |
541 | } | |
542 | #endif | |
543 | ||
8f58336d | 544 | /* modelled after ip_finish_output2 */ |
0c4b51f0 | 545 | static int vrf_finish_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
193125db | 546 | { |
8f58336d DA |
547 | struct dst_entry *dst = skb_dst(skb); |
548 | struct rtable *rt = (struct rtable *)dst; | |
549 | struct net_device *dev = dst->dev; | |
550 | unsigned int hh_len = LL_RESERVED_SPACE(dev); | |
551 | struct neighbour *neigh; | |
552 | u32 nexthop; | |
553 | int ret = -EINVAL; | |
554 | ||
eb63ecc1 DA |
555 | nf_reset(skb); |
556 | ||
8f58336d DA |
557 | /* Be paranoid, rather than too clever. */ |
558 | if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) { | |
559 | struct sk_buff *skb2; | |
560 | ||
561 | skb2 = skb_realloc_headroom(skb, LL_RESERVED_SPACE(dev)); | |
562 | if (!skb2) { | |
563 | ret = -ENOMEM; | |
564 | goto err; | |
565 | } | |
566 | if (skb->sk) | |
567 | skb_set_owner_w(skb2, skb->sk); | |
568 | ||
569 | consume_skb(skb); | |
570 | skb = skb2; | |
571 | } | |
572 | ||
573 | rcu_read_lock_bh(); | |
574 | ||
575 | nexthop = (__force u32)rt_nexthop(rt, ip_hdr(skb)->daddr); | |
576 | neigh = __ipv4_neigh_lookup_noref(dev, nexthop); | |
577 | if (unlikely(!neigh)) | |
578 | neigh = __neigh_create(&arp_tbl, &nexthop, dev, false); | |
4ff06203 JA |
579 | if (!IS_ERR(neigh)) { |
580 | sock_confirm_neigh(skb, neigh); | |
c16ec185 | 581 | ret = neigh_output(neigh, skb); |
82dd0d2a DA |
582 | rcu_read_unlock_bh(); |
583 | return ret; | |
4ff06203 | 584 | } |
8f58336d DA |
585 | |
586 | rcu_read_unlock_bh(); | |
587 | err: | |
82dd0d2a | 588 | vrf_tx_error(skb->dev, skb); |
8f58336d | 589 | return ret; |
193125db DA |
590 | } |
591 | ||
ede2059d | 592 | static int vrf_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
193125db DA |
593 | { |
594 | struct net_device *dev = skb_dst(skb)->dev; | |
595 | ||
29a26a56 | 596 | IP_UPD_PO_STATS(net, IPSTATS_MIB_OUT, skb->len); |
193125db DA |
597 | |
598 | skb->dev = dev; | |
599 | skb->protocol = htons(ETH_P_IP); | |
600 | ||
29a26a56 EB |
601 | return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING, |
602 | net, sk, skb, NULL, dev, | |
8f58336d | 603 | vrf_finish_output, |
193125db DA |
604 | !(IPCB(skb)->flags & IPSKB_REROUTED)); |
605 | } | |
606 | ||
ebfc102c DA |
607 | /* set dst on skb to send packet to us via dev_xmit path. Allows |
608 | * packet to go through device based features such as qdisc, netfilter | |
609 | * hooks and packet sockets with skb->dev set to vrf device. | |
610 | */ | |
dcdd43c4 DA |
611 | static struct sk_buff *vrf_ip_out_redirect(struct net_device *vrf_dev, |
612 | struct sk_buff *skb) | |
ebfc102c DA |
613 | { |
614 | struct net_vrf *vrf = netdev_priv(vrf_dev); | |
615 | struct dst_entry *dst = NULL; | |
616 | struct rtable *rth; | |
617 | ||
618 | rcu_read_lock(); | |
619 | ||
620 | rth = rcu_dereference(vrf->rth); | |
621 | if (likely(rth)) { | |
622 | dst = &rth->dst; | |
623 | dst_hold(dst); | |
624 | } | |
625 | ||
626 | rcu_read_unlock(); | |
627 | ||
628 | if (unlikely(!dst)) { | |
629 | vrf_tx_error(vrf_dev, skb); | |
630 | return NULL; | |
631 | } | |
632 | ||
633 | skb_dst_drop(skb); | |
634 | skb_dst_set(skb, dst); | |
635 | ||
636 | return skb; | |
637 | } | |
638 | ||
dcdd43c4 DA |
639 | static int vrf_output_direct(struct net *net, struct sock *sk, |
640 | struct sk_buff *skb) | |
641 | { | |
642 | skb->protocol = htons(ETH_P_IP); | |
643 | ||
644 | return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING, | |
645 | net, sk, skb, NULL, skb->dev, | |
646 | vrf_finish_direct, | |
647 | !(IPCB(skb)->flags & IPSKB_REROUTED)); | |
648 | } | |
649 | ||
650 | static struct sk_buff *vrf_ip_out_direct(struct net_device *vrf_dev, | |
651 | struct sock *sk, | |
652 | struct sk_buff *skb) | |
653 | { | |
654 | struct net *net = dev_net(vrf_dev); | |
655 | int err; | |
656 | ||
657 | skb->dev = vrf_dev; | |
658 | ||
659 | err = nf_hook(NFPROTO_IPV4, NF_INET_LOCAL_OUT, net, sk, | |
660 | skb, NULL, vrf_dev, vrf_output_direct); | |
661 | ||
662 | if (likely(err == 1)) | |
663 | err = vrf_output_direct(net, sk, skb); | |
664 | ||
665 | /* reset skb device */ | |
666 | if (likely(err == 1)) | |
667 | nf_reset(skb); | |
668 | else | |
669 | skb = NULL; | |
670 | ||
671 | return skb; | |
672 | } | |
673 | ||
674 | static struct sk_buff *vrf_ip_out(struct net_device *vrf_dev, | |
675 | struct sock *sk, | |
676 | struct sk_buff *skb) | |
677 | { | |
1e19c4d6 DA |
678 | /* don't divert multicast or local broadcast */ |
679 | if (ipv4_is_multicast(ip_hdr(skb)->daddr) || | |
680 | ipv4_is_lbcast(ip_hdr(skb)->daddr)) | |
dcdd43c4 DA |
681 | return skb; |
682 | ||
683 | if (qdisc_tx_is_default(vrf_dev)) | |
684 | return vrf_ip_out_direct(vrf_dev, sk, skb); | |
685 | ||
686 | return vrf_ip_out_redirect(vrf_dev, skb); | |
687 | } | |
688 | ||
ebfc102c DA |
689 | /* called with rcu lock held */ |
690 | static struct sk_buff *vrf_l3_out(struct net_device *vrf_dev, | |
691 | struct sock *sk, | |
692 | struct sk_buff *skb, | |
693 | u16 proto) | |
694 | { | |
695 | switch (proto) { | |
696 | case AF_INET: | |
697 | return vrf_ip_out(vrf_dev, sk, skb); | |
4c1feac5 DA |
698 | case AF_INET6: |
699 | return vrf_ip6_out(vrf_dev, sk, skb); | |
ebfc102c DA |
700 | } |
701 | ||
702 | return skb; | |
703 | } | |
704 | ||
b0e95ccd | 705 | /* holding rtnl */ |
810e530b | 706 | static void vrf_rtable_release(struct net_device *dev, struct net_vrf *vrf) |
193125db | 707 | { |
b0e95ccd | 708 | struct rtable *rth = rtnl_dereference(vrf->rth); |
810e530b DA |
709 | struct net *net = dev_net(dev); |
710 | struct dst_entry *dst; | |
b0e95ccd | 711 | |
afe80a49 | 712 | RCU_INIT_POINTER(vrf->rth, NULL); |
afe80a49 | 713 | synchronize_rcu(); |
193125db | 714 | |
810e530b DA |
715 | /* move dev in dst's to loopback so this VRF device can be deleted |
716 | * - based on dst_ifdown | |
717 | */ | |
718 | if (rth) { | |
719 | dst = &rth->dst; | |
720 | dev_put(dst->dev); | |
721 | dst->dev = net->loopback_dev; | |
722 | dev_hold(dst->dev); | |
723 | dst_release(dst); | |
724 | } | |
193125db DA |
725 | } |
726 | ||
b0e95ccd | 727 | static int vrf_rtable_create(struct net_device *dev) |
193125db | 728 | { |
b7503e0c | 729 | struct net_vrf *vrf = netdev_priv(dev); |
4f04256c | 730 | struct rtable *rth; |
193125db | 731 | |
b3b4663c | 732 | if (!fib_new_table(dev_net(dev), vrf->tb_id)) |
b0e95ccd | 733 | return -ENOMEM; |
b3b4663c | 734 | |
afe80a49 | 735 | /* create a dst for routing packets out through a VRF device */ |
9ab179d8 | 736 | rth = rt_dst_alloc(dev, 0, RTN_UNICAST, 1, 1, 0); |
b0e95ccd DA |
737 | if (!rth) |
738 | return -ENOMEM; | |
193125db | 739 | |
b0e95ccd | 740 | rth->dst.output = vrf_output; |
b0e95ccd DA |
741 | |
742 | rcu_assign_pointer(vrf->rth, rth); | |
743 | ||
744 | return 0; | |
193125db DA |
745 | } |
746 | ||
747 | /**************************** device handling ********************/ | |
748 | ||
749 | /* cycle interface to flush neighbor cache and move routes across tables */ | |
750 | static void cycle_netdev(struct net_device *dev) | |
751 | { | |
752 | unsigned int flags = dev->flags; | |
753 | int ret; | |
754 | ||
755 | if (!netif_running(dev)) | |
756 | return; | |
757 | ||
758 | ret = dev_change_flags(dev, flags & ~IFF_UP); | |
759 | if (ret >= 0) | |
760 | ret = dev_change_flags(dev, flags); | |
761 | ||
762 | if (ret < 0) { | |
763 | netdev_err(dev, | |
764 | "Failed to cycle device %s; route tables might be wrong!\n", | |
765 | dev->name); | |
766 | } | |
767 | } | |
768 | ||
42ab19ee DA |
769 | static int do_vrf_add_slave(struct net_device *dev, struct net_device *port_dev, |
770 | struct netlink_ext_ack *extack) | |
193125db | 771 | { |
bad53162 | 772 | int ret; |
193125db | 773 | |
26d31ac1 DA |
774 | /* do not allow loopback device to be enslaved to a VRF. |
775 | * The vrf device acts as the loopback for the vrf. | |
776 | */ | |
de3baa3e DA |
777 | if (port_dev == dev_net(dev)->loopback_dev) { |
778 | NL_SET_ERR_MSG(extack, | |
779 | "Can not enslave loopback device to a VRF"); | |
26d31ac1 | 780 | return -EOPNOTSUPP; |
de3baa3e | 781 | } |
26d31ac1 | 782 | |
fdeea7be | 783 | port_dev->priv_flags |= IFF_L3MDEV_SLAVE; |
42ab19ee | 784 | ret = netdev_master_upper_dev_link(port_dev, dev, NULL, NULL, extack); |
193125db | 785 | if (ret < 0) |
fdeea7be | 786 | goto err; |
193125db | 787 | |
193125db DA |
788 | cycle_netdev(port_dev); |
789 | ||
790 | return 0; | |
fdeea7be IS |
791 | |
792 | err: | |
793 | port_dev->priv_flags &= ~IFF_L3MDEV_SLAVE; | |
794 | return ret; | |
193125db DA |
795 | } |
796 | ||
33eaf2a6 DA |
797 | static int vrf_add_slave(struct net_device *dev, struct net_device *port_dev, |
798 | struct netlink_ext_ack *extack) | |
193125db | 799 | { |
de3baa3e DA |
800 | if (netif_is_l3_master(port_dev)) { |
801 | NL_SET_ERR_MSG(extack, | |
802 | "Can not enslave an L3 master device to a VRF"); | |
803 | return -EINVAL; | |
804 | } | |
805 | ||
806 | if (netif_is_l3_slave(port_dev)) | |
193125db DA |
807 | return -EINVAL; |
808 | ||
42ab19ee | 809 | return do_vrf_add_slave(dev, port_dev, extack); |
193125db DA |
810 | } |
811 | ||
812 | /* inverse of do_vrf_add_slave */ | |
813 | static int do_vrf_del_slave(struct net_device *dev, struct net_device *port_dev) | |
814 | { | |
193125db | 815 | netdev_upper_dev_unlink(port_dev, dev); |
fee6d4c7 | 816 | port_dev->priv_flags &= ~IFF_L3MDEV_SLAVE; |
193125db | 817 | |
193125db DA |
818 | cycle_netdev(port_dev); |
819 | ||
193125db DA |
820 | return 0; |
821 | } | |
822 | ||
823 | static int vrf_del_slave(struct net_device *dev, struct net_device *port_dev) | |
824 | { | |
193125db DA |
825 | return do_vrf_del_slave(dev, port_dev); |
826 | } | |
827 | ||
828 | static void vrf_dev_uninit(struct net_device *dev) | |
829 | { | |
830 | struct net_vrf *vrf = netdev_priv(dev); | |
193125db | 831 | |
810e530b DA |
832 | vrf_rtable_release(dev, vrf); |
833 | vrf_rt6_release(dev, vrf); | |
193125db | 834 | |
3a4a27d3 | 835 | free_percpu(dev->dstats); |
193125db DA |
836 | dev->dstats = NULL; |
837 | } | |
838 | ||
839 | static int vrf_dev_init(struct net_device *dev) | |
840 | { | |
841 | struct net_vrf *vrf = netdev_priv(dev); | |
842 | ||
193125db DA |
843 | dev->dstats = netdev_alloc_pcpu_stats(struct pcpu_dstats); |
844 | if (!dev->dstats) | |
845 | goto out_nomem; | |
846 | ||
847 | /* create the default dst which points back to us */ | |
b0e95ccd | 848 | if (vrf_rtable_create(dev) != 0) |
193125db DA |
849 | goto out_stats; |
850 | ||
35402e31 DA |
851 | if (vrf_rt6_create(dev) != 0) |
852 | goto out_rth; | |
853 | ||
193125db DA |
854 | dev->flags = IFF_MASTER | IFF_NOARP; |
855 | ||
b87ab6b8 DA |
856 | /* MTU is irrelevant for VRF device; set to 64k similar to lo */ |
857 | dev->mtu = 64 * 1024; | |
858 | ||
859 | /* similarly, oper state is irrelevant; set to up to avoid confusion */ | |
860 | dev->operstate = IF_OPER_UP; | |
78e7a2ae | 861 | netdev_lockdep_set_classes(dev); |
193125db DA |
862 | return 0; |
863 | ||
35402e31 | 864 | out_rth: |
810e530b | 865 | vrf_rtable_release(dev, vrf); |
193125db DA |
866 | out_stats: |
867 | free_percpu(dev->dstats); | |
868 | dev->dstats = NULL; | |
869 | out_nomem: | |
870 | return -ENOMEM; | |
871 | } | |
872 | ||
873 | static const struct net_device_ops vrf_netdev_ops = { | |
874 | .ndo_init = vrf_dev_init, | |
875 | .ndo_uninit = vrf_dev_uninit, | |
876 | .ndo_start_xmit = vrf_xmit, | |
877 | .ndo_get_stats64 = vrf_get_stats64, | |
878 | .ndo_add_slave = vrf_add_slave, | |
879 | .ndo_del_slave = vrf_del_slave, | |
880 | }; | |
881 | ||
ee15ee5d DA |
882 | static u32 vrf_fib_table(const struct net_device *dev) |
883 | { | |
884 | struct net_vrf *vrf = netdev_priv(dev); | |
885 | ||
886 | return vrf->tb_id; | |
887 | } | |
888 | ||
73e20b76 DA |
889 | static int vrf_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb) |
890 | { | |
1a4a5bf5 | 891 | kfree_skb(skb); |
73e20b76 DA |
892 | return 0; |
893 | } | |
894 | ||
895 | static struct sk_buff *vrf_rcv_nfhook(u8 pf, unsigned int hook, | |
896 | struct sk_buff *skb, | |
897 | struct net_device *dev) | |
898 | { | |
899 | struct net *net = dev_net(dev); | |
900 | ||
1a4a5bf5 | 901 | if (nf_hook(pf, hook, net, NULL, skb, dev, NULL, vrf_rcv_finish) != 1) |
73e20b76 DA |
902 | skb = NULL; /* kfree_skb(skb) handled by nf code */ |
903 | ||
904 | return skb; | |
905 | } | |
906 | ||
74b20582 DA |
907 | #if IS_ENABLED(CONFIG_IPV6) |
908 | /* neighbor handling is done with actual device; do not want | |
909 | * to flip skb->dev for those ndisc packets. This really fails | |
910 | * for multiple next protocols (e.g., NEXTHDR_HOP). But it is | |
911 | * a start. | |
912 | */ | |
913 | static bool ipv6_ndisc_frame(const struct sk_buff *skb) | |
914 | { | |
915 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
916 | bool rc = false; | |
917 | ||
918 | if (iph->nexthdr == NEXTHDR_ICMP) { | |
919 | const struct icmp6hdr *icmph; | |
920 | struct icmp6hdr _icmph; | |
921 | ||
922 | icmph = skb_header_pointer(skb, sizeof(*iph), | |
923 | sizeof(_icmph), &_icmph); | |
924 | if (!icmph) | |
925 | goto out; | |
926 | ||
927 | switch (icmph->icmp6_type) { | |
928 | case NDISC_ROUTER_SOLICITATION: | |
929 | case NDISC_ROUTER_ADVERTISEMENT: | |
930 | case NDISC_NEIGHBOUR_SOLICITATION: | |
931 | case NDISC_NEIGHBOUR_ADVERTISEMENT: | |
932 | case NDISC_REDIRECT: | |
933 | rc = true; | |
934 | break; | |
935 | } | |
936 | } | |
937 | ||
938 | out: | |
939 | return rc; | |
940 | } | |
941 | ||
9ff74384 DA |
942 | static struct rt6_info *vrf_ip6_route_lookup(struct net *net, |
943 | const struct net_device *dev, | |
944 | struct flowi6 *fl6, | |
945 | int ifindex, | |
b75cc8f9 | 946 | const struct sk_buff *skb, |
9ff74384 DA |
947 | int flags) |
948 | { | |
949 | struct net_vrf *vrf = netdev_priv(dev); | |
9ff74384 | 950 | |
43b059a3 | 951 | return ip6_pol_route(net, vrf->fib6_table, ifindex, fl6, skb, flags); |
9ff74384 DA |
952 | } |
953 | ||
954 | static void vrf_ip6_input_dst(struct sk_buff *skb, struct net_device *vrf_dev, | |
955 | int ifindex) | |
956 | { | |
957 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
958 | struct flowi6 fl6 = { | |
ecf09117 AB |
959 | .flowi6_iif = ifindex, |
960 | .flowi6_mark = skb->mark, | |
961 | .flowi6_proto = iph->nexthdr, | |
9ff74384 DA |
962 | .daddr = iph->daddr, |
963 | .saddr = iph->saddr, | |
964 | .flowlabel = ip6_flowinfo(iph), | |
9ff74384 DA |
965 | }; |
966 | struct net *net = dev_net(vrf_dev); | |
967 | struct rt6_info *rt6; | |
968 | ||
b75cc8f9 | 969 | rt6 = vrf_ip6_route_lookup(net, vrf_dev, &fl6, ifindex, skb, |
9ff74384 DA |
970 | RT6_LOOKUP_F_HAS_SADDR | RT6_LOOKUP_F_IFACE); |
971 | if (unlikely(!rt6)) | |
972 | return; | |
973 | ||
974 | if (unlikely(&rt6->dst == &net->ipv6.ip6_null_entry->dst)) | |
975 | return; | |
976 | ||
977 | skb_dst_set(skb, &rt6->dst); | |
978 | } | |
979 | ||
74b20582 DA |
980 | static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev, |
981 | struct sk_buff *skb) | |
982 | { | |
9ff74384 DA |
983 | int orig_iif = skb->skb_iif; |
984 | bool need_strict; | |
985 | ||
b4869aa2 DA |
986 | /* loopback traffic; do not push through packet taps again. |
987 | * Reset pkt_type for upper layers to process skb | |
988 | */ | |
989 | if (skb->pkt_type == PACKET_LOOPBACK) { | |
990 | skb->dev = vrf_dev; | |
991 | skb->skb_iif = vrf_dev->ifindex; | |
a04a480d | 992 | IP6CB(skb)->flags |= IP6SKB_L3SLAVE; |
b4869aa2 DA |
993 | skb->pkt_type = PACKET_HOST; |
994 | goto out; | |
995 | } | |
996 | ||
9ff74384 DA |
997 | /* if packet is NDISC or addressed to multicast or link-local |
998 | * then keep the ingress interface | |
999 | */ | |
1000 | need_strict = rt6_need_strict(&ipv6_hdr(skb)->daddr); | |
1001 | if (!ipv6_ndisc_frame(skb) && !need_strict) { | |
926d93a3 | 1002 | vrf_rx_stats(vrf_dev, skb->len); |
74b20582 DA |
1003 | skb->dev = vrf_dev; |
1004 | skb->skb_iif = vrf_dev->ifindex; | |
1005 | ||
a9ec54d1 DA |
1006 | if (!list_empty(&vrf_dev->ptype_all)) { |
1007 | skb_push(skb, skb->mac_len); | |
1008 | dev_queue_xmit_nit(skb, vrf_dev); | |
1009 | skb_pull(skb, skb->mac_len); | |
1010 | } | |
74b20582 DA |
1011 | |
1012 | IP6CB(skb)->flags |= IP6SKB_L3SLAVE; | |
1013 | } | |
1014 | ||
9ff74384 DA |
1015 | if (need_strict) |
1016 | vrf_ip6_input_dst(skb, vrf_dev, orig_iif); | |
1017 | ||
73e20b76 | 1018 | skb = vrf_rcv_nfhook(NFPROTO_IPV6, NF_INET_PRE_ROUTING, skb, vrf_dev); |
b4869aa2 | 1019 | out: |
74b20582 DA |
1020 | return skb; |
1021 | } | |
1022 | ||
1023 | #else | |
1024 | static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev, | |
1025 | struct sk_buff *skb) | |
1026 | { | |
1027 | return skb; | |
1028 | } | |
1029 | #endif | |
1030 | ||
1031 | static struct sk_buff *vrf_ip_rcv(struct net_device *vrf_dev, | |
1032 | struct sk_buff *skb) | |
1033 | { | |
1034 | skb->dev = vrf_dev; | |
1035 | skb->skb_iif = vrf_dev->ifindex; | |
a04a480d | 1036 | IPCB(skb)->flags |= IPSKB_L3SLAVE; |
74b20582 | 1037 | |
e58e4159 DA |
1038 | if (ipv4_is_multicast(ip_hdr(skb)->daddr)) |
1039 | goto out; | |
1040 | ||
afe80a49 DA |
1041 | /* loopback traffic; do not push through packet taps again. |
1042 | * Reset pkt_type for upper layers to process skb | |
1043 | */ | |
1044 | if (skb->pkt_type == PACKET_LOOPBACK) { | |
1045 | skb->pkt_type = PACKET_HOST; | |
1046 | goto out; | |
1047 | } | |
1048 | ||
926d93a3 DA |
1049 | vrf_rx_stats(vrf_dev, skb->len); |
1050 | ||
dcdd43c4 DA |
1051 | if (!list_empty(&vrf_dev->ptype_all)) { |
1052 | skb_push(skb, skb->mac_len); | |
1053 | dev_queue_xmit_nit(skb, vrf_dev); | |
1054 | skb_pull(skb, skb->mac_len); | |
1055 | } | |
74b20582 | 1056 | |
73e20b76 | 1057 | skb = vrf_rcv_nfhook(NFPROTO_IPV4, NF_INET_PRE_ROUTING, skb, vrf_dev); |
afe80a49 | 1058 | out: |
74b20582 DA |
1059 | return skb; |
1060 | } | |
1061 | ||
1062 | /* called with rcu lock held */ | |
1063 | static struct sk_buff *vrf_l3_rcv(struct net_device *vrf_dev, | |
1064 | struct sk_buff *skb, | |
1065 | u16 proto) | |
1066 | { | |
1067 | switch (proto) { | |
1068 | case AF_INET: | |
1069 | return vrf_ip_rcv(vrf_dev, skb); | |
1070 | case AF_INET6: | |
1071 | return vrf_ip6_rcv(vrf_dev, skb); | |
1072 | } | |
1073 | ||
1074 | return skb; | |
1075 | } | |
1076 | ||
35402e31 | 1077 | #if IS_ENABLED(CONFIG_IPV6) |
4c1feac5 DA |
1078 | /* send to link-local or multicast address via interface enslaved to |
1079 | * VRF device. Force lookup to VRF table without changing flow struct | |
1080 | */ | |
1081 | static struct dst_entry *vrf_link_scope_lookup(const struct net_device *dev, | |
1082 | struct flowi6 *fl6) | |
35402e31 | 1083 | { |
9ff74384 | 1084 | struct net *net = dev_net(dev); |
4c1feac5 | 1085 | int flags = RT6_LOOKUP_F_IFACE; |
b0e95ccd | 1086 | struct dst_entry *dst = NULL; |
9ff74384 | 1087 | struct rt6_info *rt; |
35402e31 | 1088 | |
4c1feac5 DA |
1089 | /* VRF device does not have a link-local address and |
1090 | * sending packets to link-local or mcast addresses over | |
1091 | * a VRF device does not make sense | |
1092 | */ | |
1093 | if (fl6->flowi6_oif == dev->ifindex) { | |
1094 | dst = &net->ipv6.ip6_null_entry->dst; | |
1095 | dst_hold(dst); | |
1096 | return dst; | |
35402e31 DA |
1097 | } |
1098 | ||
4c1feac5 DA |
1099 | if (!ipv6_addr_any(&fl6->saddr)) |
1100 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
1101 | ||
b75cc8f9 | 1102 | rt = vrf_ip6_route_lookup(net, dev, fl6, fl6->flowi6_oif, NULL, flags); |
4c1feac5 DA |
1103 | if (rt) |
1104 | dst = &rt->dst; | |
9ff74384 | 1105 | |
b0e95ccd | 1106 | return dst; |
35402e31 DA |
1107 | } |
1108 | #endif | |
1109 | ||
ee15ee5d DA |
1110 | static const struct l3mdev_ops vrf_l3mdev_ops = { |
1111 | .l3mdev_fib_table = vrf_fib_table, | |
74b20582 | 1112 | .l3mdev_l3_rcv = vrf_l3_rcv, |
ebfc102c | 1113 | .l3mdev_l3_out = vrf_l3_out, |
35402e31 | 1114 | #if IS_ENABLED(CONFIG_IPV6) |
4c1feac5 | 1115 | .l3mdev_link_scope_lookup = vrf_link_scope_lookup, |
35402e31 | 1116 | #endif |
ee15ee5d DA |
1117 | }; |
1118 | ||
193125db DA |
1119 | static void vrf_get_drvinfo(struct net_device *dev, |
1120 | struct ethtool_drvinfo *info) | |
1121 | { | |
1122 | strlcpy(info->driver, DRV_NAME, sizeof(info->driver)); | |
1123 | strlcpy(info->version, DRV_VERSION, sizeof(info->version)); | |
1124 | } | |
1125 | ||
1126 | static const struct ethtool_ops vrf_ethtool_ops = { | |
1127 | .get_drvinfo = vrf_get_drvinfo, | |
1128 | }; | |
1129 | ||
1aa6c4f6 DA |
1130 | static inline size_t vrf_fib_rule_nl_size(void) |
1131 | { | |
1132 | size_t sz; | |
1133 | ||
1134 | sz = NLMSG_ALIGN(sizeof(struct fib_rule_hdr)); | |
1135 | sz += nla_total_size(sizeof(u8)); /* FRA_L3MDEV */ | |
1136 | sz += nla_total_size(sizeof(u32)); /* FRA_PRIORITY */ | |
1b71af60 | 1137 | sz += nla_total_size(sizeof(u8)); /* FRA_PROTOCOL */ |
1aa6c4f6 DA |
1138 | |
1139 | return sz; | |
1140 | } | |
1141 | ||
1142 | static int vrf_fib_rule(const struct net_device *dev, __u8 family, bool add_it) | |
1143 | { | |
1144 | struct fib_rule_hdr *frh; | |
1145 | struct nlmsghdr *nlh; | |
1146 | struct sk_buff *skb; | |
1147 | int err; | |
1148 | ||
e4348637 DA |
1149 | if (family == AF_INET6 && !ipv6_mod_enabled()) |
1150 | return 0; | |
1151 | ||
1aa6c4f6 DA |
1152 | skb = nlmsg_new(vrf_fib_rule_nl_size(), GFP_KERNEL); |
1153 | if (!skb) | |
1154 | return -ENOMEM; | |
1155 | ||
1156 | nlh = nlmsg_put(skb, 0, 0, 0, sizeof(*frh), 0); | |
1157 | if (!nlh) | |
1158 | goto nla_put_failure; | |
1159 | ||
1160 | /* rule only needs to appear once */ | |
426c87ca | 1161 | nlh->nlmsg_flags |= NLM_F_EXCL; |
1aa6c4f6 DA |
1162 | |
1163 | frh = nlmsg_data(nlh); | |
1164 | memset(frh, 0, sizeof(*frh)); | |
1165 | frh->family = family; | |
1166 | frh->action = FR_ACT_TO_TBL; | |
1b71af60 DS |
1167 | |
1168 | if (nla_put_u8(skb, FRA_PROTOCOL, RTPROT_KERNEL)) | |
1169 | goto nla_put_failure; | |
1aa6c4f6 | 1170 | |
18129a24 | 1171 | if (nla_put_u8(skb, FRA_L3MDEV, 1)) |
1aa6c4f6 DA |
1172 | goto nla_put_failure; |
1173 | ||
1174 | if (nla_put_u32(skb, FRA_PRIORITY, FIB_RULE_PREF)) | |
1175 | goto nla_put_failure; | |
1176 | ||
1177 | nlmsg_end(skb, nlh); | |
1178 | ||
1179 | /* fib_nl_{new,del}rule handling looks for net from skb->sk */ | |
1180 | skb->sk = dev_net(dev)->rtnl; | |
1181 | if (add_it) { | |
c21ef3e3 | 1182 | err = fib_nl_newrule(skb, nlh, NULL); |
1aa6c4f6 DA |
1183 | if (err == -EEXIST) |
1184 | err = 0; | |
1185 | } else { | |
c21ef3e3 | 1186 | err = fib_nl_delrule(skb, nlh, NULL); |
1aa6c4f6 DA |
1187 | if (err == -ENOENT) |
1188 | err = 0; | |
1189 | } | |
1190 | nlmsg_free(skb); | |
1191 | ||
1192 | return err; | |
1193 | ||
1194 | nla_put_failure: | |
1195 | nlmsg_free(skb); | |
1196 | ||
1197 | return -EMSGSIZE; | |
1198 | } | |
1199 | ||
1200 | static int vrf_add_fib_rules(const struct net_device *dev) | |
1201 | { | |
1202 | int err; | |
1203 | ||
1204 | err = vrf_fib_rule(dev, AF_INET, true); | |
1205 | if (err < 0) | |
1206 | goto out_err; | |
1207 | ||
1208 | err = vrf_fib_rule(dev, AF_INET6, true); | |
1209 | if (err < 0) | |
1210 | goto ipv6_err; | |
1211 | ||
e58e4159 DA |
1212 | #if IS_ENABLED(CONFIG_IP_MROUTE_MULTIPLE_TABLES) |
1213 | err = vrf_fib_rule(dev, RTNL_FAMILY_IPMR, true); | |
1214 | if (err < 0) | |
1215 | goto ipmr_err; | |
1216 | #endif | |
1217 | ||
1aa6c4f6 DA |
1218 | return 0; |
1219 | ||
e58e4159 DA |
1220 | #if IS_ENABLED(CONFIG_IP_MROUTE_MULTIPLE_TABLES) |
1221 | ipmr_err: | |
1222 | vrf_fib_rule(dev, AF_INET6, false); | |
1223 | #endif | |
1224 | ||
1aa6c4f6 DA |
1225 | ipv6_err: |
1226 | vrf_fib_rule(dev, AF_INET, false); | |
1227 | ||
1228 | out_err: | |
1229 | netdev_err(dev, "Failed to add FIB rules.\n"); | |
1230 | return err; | |
1231 | } | |
1232 | ||
193125db DA |
1233 | static void vrf_setup(struct net_device *dev) |
1234 | { | |
1235 | ether_setup(dev); | |
1236 | ||
1237 | /* Initialize the device structure. */ | |
1238 | dev->netdev_ops = &vrf_netdev_ops; | |
ee15ee5d | 1239 | dev->l3mdev_ops = &vrf_l3mdev_ops; |
193125db | 1240 | dev->ethtool_ops = &vrf_ethtool_ops; |
cf124db5 | 1241 | dev->needs_free_netdev = true; |
193125db DA |
1242 | |
1243 | /* Fill in device structure with ethernet-generic values. */ | |
1244 | eth_hw_addr_random(dev); | |
1245 | ||
1246 | /* don't acquire vrf device's netif_tx_lock when transmitting */ | |
1247 | dev->features |= NETIF_F_LLTX; | |
1248 | ||
1249 | /* don't allow vrf devices to change network namespaces. */ | |
1250 | dev->features |= NETIF_F_NETNS_LOCAL; | |
7889681f DA |
1251 | |
1252 | /* does not make sense for a VLAN to be added to a vrf device */ | |
1253 | dev->features |= NETIF_F_VLAN_CHALLENGED; | |
1254 | ||
1255 | /* enable offload features */ | |
1256 | dev->features |= NETIF_F_GSO_SOFTWARE; | |
1257 | dev->features |= NETIF_F_RXCSUM | NETIF_F_HW_CSUM; | |
1258 | dev->features |= NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA; | |
1259 | ||
1260 | dev->hw_features = dev->features; | |
1261 | dev->hw_enc_features = dev->features; | |
1262 | ||
1263 | /* default to no qdisc; user can add if desired */ | |
1264 | dev->priv_flags |= IFF_NO_QUEUE; | |
193125db DA |
1265 | } |
1266 | ||
a8b8a889 MS |
1267 | static int vrf_validate(struct nlattr *tb[], struct nlattr *data[], |
1268 | struct netlink_ext_ack *extack) | |
193125db DA |
1269 | { |
1270 | if (tb[IFLA_ADDRESS]) { | |
53b94835 DA |
1271 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) { |
1272 | NL_SET_ERR_MSG(extack, "Invalid hardware address"); | |
193125db | 1273 | return -EINVAL; |
53b94835 DA |
1274 | } |
1275 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) { | |
1276 | NL_SET_ERR_MSG(extack, "Invalid hardware address"); | |
193125db | 1277 | return -EADDRNOTAVAIL; |
53b94835 | 1278 | } |
193125db DA |
1279 | } |
1280 | return 0; | |
1281 | } | |
1282 | ||
1283 | static void vrf_dellink(struct net_device *dev, struct list_head *head) | |
1284 | { | |
f630c38e NA |
1285 | struct net_device *port_dev; |
1286 | struct list_head *iter; | |
1287 | ||
1288 | netdev_for_each_lower_dev(dev, port_dev, iter) | |
1289 | vrf_del_slave(dev, port_dev); | |
1290 | ||
193125db DA |
1291 | unregister_netdevice_queue(dev, head); |
1292 | } | |
1293 | ||
1294 | static int vrf_newlink(struct net *src_net, struct net_device *dev, | |
7a3f4a18 MS |
1295 | struct nlattr *tb[], struct nlattr *data[], |
1296 | struct netlink_ext_ack *extack) | |
193125db DA |
1297 | { |
1298 | struct net_vrf *vrf = netdev_priv(dev); | |
097d3c95 DA |
1299 | bool *add_fib_rules; |
1300 | struct net *net; | |
1aa6c4f6 | 1301 | int err; |
193125db | 1302 | |
53b94835 DA |
1303 | if (!data || !data[IFLA_VRF_TABLE]) { |
1304 | NL_SET_ERR_MSG(extack, "VRF table id is missing"); | |
193125db | 1305 | return -EINVAL; |
53b94835 | 1306 | } |
193125db DA |
1307 | |
1308 | vrf->tb_id = nla_get_u32(data[IFLA_VRF_TABLE]); | |
53b94835 DA |
1309 | if (vrf->tb_id == RT_TABLE_UNSPEC) { |
1310 | NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VRF_TABLE], | |
1311 | "Invalid VRF table id"); | |
24c63bbc | 1312 | return -EINVAL; |
53b94835 | 1313 | } |
193125db | 1314 | |
007979ea | 1315 | dev->priv_flags |= IFF_L3MDEV_MASTER; |
193125db | 1316 | |
1aa6c4f6 DA |
1317 | err = register_netdevice(dev); |
1318 | if (err) | |
1319 | goto out; | |
1320 | ||
097d3c95 DA |
1321 | net = dev_net(dev); |
1322 | add_fib_rules = net_generic(net, vrf_net_id); | |
1323 | if (*add_fib_rules) { | |
1aa6c4f6 DA |
1324 | err = vrf_add_fib_rules(dev); |
1325 | if (err) { | |
1326 | unregister_netdevice(dev); | |
1327 | goto out; | |
1328 | } | |
097d3c95 | 1329 | *add_fib_rules = false; |
1aa6c4f6 DA |
1330 | } |
1331 | ||
1332 | out: | |
1333 | return err; | |
193125db DA |
1334 | } |
1335 | ||
1336 | static size_t vrf_nl_getsize(const struct net_device *dev) | |
1337 | { | |
1338 | return nla_total_size(sizeof(u32)); /* IFLA_VRF_TABLE */ | |
1339 | } | |
1340 | ||
1341 | static int vrf_fillinfo(struct sk_buff *skb, | |
1342 | const struct net_device *dev) | |
1343 | { | |
1344 | struct net_vrf *vrf = netdev_priv(dev); | |
1345 | ||
1346 | return nla_put_u32(skb, IFLA_VRF_TABLE, vrf->tb_id); | |
1347 | } | |
1348 | ||
67eb0331 DA |
1349 | static size_t vrf_get_slave_size(const struct net_device *bond_dev, |
1350 | const struct net_device *slave_dev) | |
1351 | { | |
1352 | return nla_total_size(sizeof(u32)); /* IFLA_VRF_PORT_TABLE */ | |
1353 | } | |
1354 | ||
1355 | static int vrf_fill_slave_info(struct sk_buff *skb, | |
1356 | const struct net_device *vrf_dev, | |
1357 | const struct net_device *slave_dev) | |
1358 | { | |
1359 | struct net_vrf *vrf = netdev_priv(vrf_dev); | |
1360 | ||
1361 | if (nla_put_u32(skb, IFLA_VRF_PORT_TABLE, vrf->tb_id)) | |
1362 | return -EMSGSIZE; | |
1363 | ||
1364 | return 0; | |
1365 | } | |
1366 | ||
193125db DA |
1367 | static const struct nla_policy vrf_nl_policy[IFLA_VRF_MAX + 1] = { |
1368 | [IFLA_VRF_TABLE] = { .type = NLA_U32 }, | |
1369 | }; | |
1370 | ||
1371 | static struct rtnl_link_ops vrf_link_ops __read_mostly = { | |
1372 | .kind = DRV_NAME, | |
1373 | .priv_size = sizeof(struct net_vrf), | |
1374 | ||
1375 | .get_size = vrf_nl_getsize, | |
1376 | .policy = vrf_nl_policy, | |
1377 | .validate = vrf_validate, | |
1378 | .fill_info = vrf_fillinfo, | |
1379 | ||
67eb0331 DA |
1380 | .get_slave_size = vrf_get_slave_size, |
1381 | .fill_slave_info = vrf_fill_slave_info, | |
1382 | ||
193125db DA |
1383 | .newlink = vrf_newlink, |
1384 | .dellink = vrf_dellink, | |
1385 | .setup = vrf_setup, | |
1386 | .maxtype = IFLA_VRF_MAX, | |
1387 | }; | |
1388 | ||
1389 | static int vrf_device_event(struct notifier_block *unused, | |
1390 | unsigned long event, void *ptr) | |
1391 | { | |
1392 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
1393 | ||
1394 | /* only care about unregister events to drop slave references */ | |
1395 | if (event == NETDEV_UNREGISTER) { | |
193125db DA |
1396 | struct net_device *vrf_dev; |
1397 | ||
fee6d4c7 | 1398 | if (!netif_is_l3_slave(dev)) |
193125db DA |
1399 | goto out; |
1400 | ||
58aa9087 NA |
1401 | vrf_dev = netdev_master_upper_dev_get(dev); |
1402 | vrf_del_slave(vrf_dev, dev); | |
193125db DA |
1403 | } |
1404 | out: | |
1405 | return NOTIFY_DONE; | |
1406 | } | |
1407 | ||
1408 | static struct notifier_block vrf_notifier_block __read_mostly = { | |
1409 | .notifier_call = vrf_device_event, | |
1410 | }; | |
1411 | ||
097d3c95 DA |
1412 | /* Initialize per network namespace state */ |
1413 | static int __net_init vrf_netns_init(struct net *net) | |
1414 | { | |
1415 | bool *add_fib_rules = net_generic(net, vrf_net_id); | |
1416 | ||
1417 | *add_fib_rules = true; | |
1418 | ||
1419 | return 0; | |
1420 | } | |
1421 | ||
1422 | static struct pernet_operations vrf_net_ops __net_initdata = { | |
1423 | .init = vrf_netns_init, | |
1424 | .id = &vrf_net_id, | |
1425 | .size = sizeof(bool), | |
1426 | }; | |
1427 | ||
193125db DA |
1428 | static int __init vrf_init_module(void) |
1429 | { | |
1430 | int rc; | |
1431 | ||
193125db DA |
1432 | register_netdevice_notifier(&vrf_notifier_block); |
1433 | ||
097d3c95 | 1434 | rc = register_pernet_subsys(&vrf_net_ops); |
193125db DA |
1435 | if (rc < 0) |
1436 | goto error; | |
1437 | ||
097d3c95 DA |
1438 | rc = rtnl_link_register(&vrf_link_ops); |
1439 | if (rc < 0) { | |
1440 | unregister_pernet_subsys(&vrf_net_ops); | |
1441 | goto error; | |
1442 | } | |
1443 | ||
193125db DA |
1444 | return 0; |
1445 | ||
1446 | error: | |
1447 | unregister_netdevice_notifier(&vrf_notifier_block); | |
193125db DA |
1448 | return rc; |
1449 | } | |
1450 | ||
193125db | 1451 | module_init(vrf_init_module); |
193125db DA |
1452 | MODULE_AUTHOR("Shrijeet Mukherjee, David Ahern"); |
1453 | MODULE_DESCRIPTION("Device driver to instantiate VRF domains"); | |
1454 | MODULE_LICENSE("GPL"); | |
1455 | MODULE_ALIAS_RTNL_LINK(DRV_NAME); | |
1456 | MODULE_VERSION(DRV_VERSION); |