]>
Commit | Line | Data |
---|---|---|
193125db DA |
1 | /* |
2 | * vrf.c: device driver to encapsulate a VRF space | |
3 | * | |
4 | * Copyright (c) 2015 Cumulus Networks. All rights reserved. | |
5 | * Copyright (c) 2015 Shrijeet Mukherjee <shm@cumulusnetworks.com> | |
6 | * Copyright (c) 2015 David Ahern <dsa@cumulusnetworks.com> | |
7 | * | |
8 | * Based on dummy, team and ipvlan drivers | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | */ | |
15 | ||
16 | #include <linux/module.h> | |
17 | #include <linux/kernel.h> | |
18 | #include <linux/netdevice.h> | |
19 | #include <linux/etherdevice.h> | |
20 | #include <linux/ip.h> | |
21 | #include <linux/init.h> | |
22 | #include <linux/moduleparam.h> | |
23 | #include <linux/netfilter.h> | |
24 | #include <linux/rtnetlink.h> | |
25 | #include <net/rtnetlink.h> | |
26 | #include <linux/u64_stats_sync.h> | |
27 | #include <linux/hashtable.h> | |
28 | ||
29 | #include <linux/inetdevice.h> | |
8f58336d | 30 | #include <net/arp.h> |
193125db DA |
31 | #include <net/ip.h> |
32 | #include <net/ip_fib.h> | |
35402e31 | 33 | #include <net/ip6_fib.h> |
193125db | 34 | #include <net/ip6_route.h> |
193125db DA |
35 | #include <net/route.h> |
36 | #include <net/addrconf.h> | |
ee15ee5d | 37 | #include <net/l3mdev.h> |
1aa6c4f6 | 38 | #include <net/fib_rules.h> |
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; | |
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 | ||
dcdd43c4 DA |
107 | /* by default VRF devices do not have a qdisc and are expected |
108 | * to be created with only a single queue. | |
109 | */ | |
110 | static bool qdisc_tx_is_default(const struct net_device *dev) | |
111 | { | |
112 | struct netdev_queue *txq; | |
113 | struct Qdisc *qdisc; | |
114 | ||
115 | if (dev->num_tx_queues > 1) | |
116 | return false; | |
117 | ||
118 | txq = netdev_get_tx_queue(dev, 0); | |
119 | qdisc = rcu_access_pointer(txq->qdisc); | |
120 | ||
121 | return !qdisc->enqueue; | |
122 | } | |
123 | ||
afe80a49 DA |
124 | /* Local traffic destined to local address. Reinsert the packet to rx |
125 | * path, similar to loopback handling. | |
126 | */ | |
127 | static int vrf_local_xmit(struct sk_buff *skb, struct net_device *dev, | |
128 | struct dst_entry *dst) | |
129 | { | |
130 | int len = skb->len; | |
131 | ||
132 | skb_orphan(skb); | |
133 | ||
134 | skb_dst_set(skb, dst); | |
afe80a49 DA |
135 | |
136 | /* set pkt_type to avoid skb hitting packet taps twice - | |
137 | * once on Tx and again in Rx processing | |
138 | */ | |
139 | skb->pkt_type = PACKET_LOOPBACK; | |
140 | ||
141 | skb->protocol = eth_type_trans(skb, dev); | |
142 | ||
143 | if (likely(netif_rx(skb) == NET_RX_SUCCESS)) | |
144 | vrf_rx_stats(dev, len); | |
145 | else | |
146 | this_cpu_inc(dev->dstats->rx_drps); | |
147 | ||
148 | return NETDEV_TX_OK; | |
149 | } | |
150 | ||
35402e31 | 151 | #if IS_ENABLED(CONFIG_IPV6) |
4c1feac5 DA |
152 | static int vrf_ip6_local_out(struct net *net, struct sock *sk, |
153 | struct sk_buff *skb) | |
154 | { | |
155 | int err; | |
156 | ||
157 | err = nf_hook(NFPROTO_IPV6, NF_INET_LOCAL_OUT, net, | |
158 | sk, skb, NULL, skb_dst(skb)->dev, dst_output); | |
159 | ||
160 | if (likely(err == 1)) | |
161 | err = dst_output(net, sk, skb); | |
162 | ||
163 | return err; | |
164 | } | |
165 | ||
35402e31 DA |
166 | static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb, |
167 | struct net_device *dev) | |
168 | { | |
37e73b05 | 169 | const struct ipv6hdr *iph; |
35402e31 | 170 | struct net *net = dev_net(skb->dev); |
37e73b05 | 171 | struct flowi6 fl6; |
35402e31 DA |
172 | int ret = NET_XMIT_DROP; |
173 | struct dst_entry *dst; | |
174 | struct dst_entry *dst_null = &net->ipv6.ip6_null_entry->dst; | |
175 | ||
37e73b05 PK |
176 | if (!pskb_may_pull(skb, ETH_HLEN + sizeof(struct ipv6hdr))) |
177 | goto err; | |
178 | ||
179 | iph = ipv6_hdr(skb); | |
180 | ||
181 | memset(&fl6, 0, sizeof(fl6)); | |
182 | /* needed to match OIF rule */ | |
183 | fl6.flowi6_oif = dev->ifindex; | |
184 | fl6.flowi6_iif = LOOPBACK_IFINDEX; | |
185 | fl6.daddr = iph->daddr; | |
186 | fl6.saddr = iph->saddr; | |
187 | fl6.flowlabel = ip6_flowinfo(iph); | |
188 | fl6.flowi6_mark = skb->mark; | |
189 | fl6.flowi6_proto = iph->nexthdr; | |
190 | fl6.flowi6_flags = FLOWI_FLAG_SKIP_NH_OIF; | |
191 | ||
35402e31 DA |
192 | dst = ip6_route_output(net, NULL, &fl6); |
193 | if (dst == dst_null) | |
194 | goto err; | |
195 | ||
196 | skb_dst_drop(skb); | |
b4869aa2 DA |
197 | |
198 | /* if dst.dev is loopback or the VRF device again this is locally | |
199 | * originated traffic destined to a local address. Short circuit | |
4f04256c | 200 | * to Rx path |
b4869aa2 | 201 | */ |
4f04256c DA |
202 | if (dst->dev == dev) |
203 | return vrf_local_xmit(skb, dev, dst); | |
b4869aa2 | 204 | |
35402e31 DA |
205 | skb_dst_set(skb, dst); |
206 | ||
911a66fb DA |
207 | /* strip the ethernet header added for pass through VRF device */ |
208 | __skb_pull(skb, skb_network_offset(skb)); | |
209 | ||
4c1feac5 | 210 | ret = vrf_ip6_local_out(net, skb->sk, skb); |
35402e31 DA |
211 | if (unlikely(net_xmit_eval(ret))) |
212 | dev->stats.tx_errors++; | |
213 | else | |
214 | ret = NET_XMIT_SUCCESS; | |
215 | ||
216 | return ret; | |
217 | err: | |
218 | vrf_tx_error(dev, skb); | |
219 | return NET_XMIT_DROP; | |
220 | } | |
221 | #else | |
193125db DA |
222 | static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb, |
223 | struct net_device *dev) | |
224 | { | |
57b8efa1 NA |
225 | vrf_tx_error(dev, skb); |
226 | return NET_XMIT_DROP; | |
193125db | 227 | } |
35402e31 | 228 | #endif |
193125db | 229 | |
ebfc102c DA |
230 | /* based on ip_local_out; can't use it b/c the dst is switched pointing to us */ |
231 | static int vrf_ip_local_out(struct net *net, struct sock *sk, | |
232 | struct sk_buff *skb) | |
233 | { | |
234 | int err; | |
235 | ||
236 | err = nf_hook(NFPROTO_IPV4, NF_INET_LOCAL_OUT, net, sk, | |
237 | skb, NULL, skb_dst(skb)->dev, dst_output); | |
238 | if (likely(err == 1)) | |
239 | err = dst_output(net, sk, skb); | |
240 | ||
241 | return err; | |
242 | } | |
243 | ||
193125db DA |
244 | static netdev_tx_t vrf_process_v4_outbound(struct sk_buff *skb, |
245 | struct net_device *vrf_dev) | |
246 | { | |
37e73b05 | 247 | struct iphdr *ip4h; |
193125db | 248 | int ret = NET_XMIT_DROP; |
37e73b05 | 249 | struct flowi4 fl4; |
911a66fb DA |
250 | struct net *net = dev_net(vrf_dev); |
251 | struct rtable *rt; | |
252 | ||
37e73b05 PK |
253 | if (!pskb_may_pull(skb, ETH_HLEN + sizeof(struct iphdr))) |
254 | goto err; | |
255 | ||
256 | ip4h = ip_hdr(skb); | |
257 | ||
258 | memset(&fl4, 0, sizeof(fl4)); | |
259 | /* needed to match OIF rule */ | |
260 | fl4.flowi4_oif = vrf_dev->ifindex; | |
261 | fl4.flowi4_iif = LOOPBACK_IFINDEX; | |
262 | fl4.flowi4_tos = RT_TOS(ip4h->tos); | |
263 | fl4.flowi4_flags = FLOWI_FLAG_ANYSRC | FLOWI_FLAG_SKIP_NH_OIF; | |
264 | fl4.flowi4_proto = ip4h->protocol; | |
265 | fl4.daddr = ip4h->daddr; | |
266 | fl4.saddr = ip4h->saddr; | |
267 | ||
911a66fb DA |
268 | rt = ip_route_output_flow(net, &fl4, NULL); |
269 | if (IS_ERR(rt)) | |
270 | goto err; | |
193125db | 271 | |
911a66fb | 272 | skb_dst_drop(skb); |
afe80a49 DA |
273 | |
274 | /* if dst.dev is loopback or the VRF device again this is locally | |
275 | * originated traffic destined to a local address. Short circuit | |
4f04256c | 276 | * to Rx path |
afe80a49 | 277 | */ |
4f04256c DA |
278 | if (rt->dst.dev == vrf_dev) |
279 | return vrf_local_xmit(skb, vrf_dev, &rt->dst); | |
afe80a49 | 280 | |
911a66fb 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 | ||
ebfc102c | 291 | ret = vrf_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 | { | |
f7887d40 | 319 | int len = skb->len; |
193125db DA |
320 | netdev_tx_t ret = is_ip_tx_frame(skb, dev); |
321 | ||
322 | if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { | |
323 | struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats); | |
324 | ||
325 | u64_stats_update_begin(&dstats->syncp); | |
326 | dstats->tx_pkts++; | |
f7887d40 | 327 | dstats->tx_bytes += len; |
193125db DA |
328 | u64_stats_update_end(&dstats->syncp); |
329 | } else { | |
330 | this_cpu_inc(dev->dstats->tx_drps); | |
331 | } | |
332 | ||
333 | return ret; | |
334 | } | |
335 | ||
dcdd43c4 DA |
336 | static int vrf_finish_direct(struct net *net, struct sock *sk, |
337 | struct sk_buff *skb) | |
338 | { | |
339 | struct net_device *vrf_dev = skb->dev; | |
340 | ||
341 | if (!list_empty(&vrf_dev->ptype_all) && | |
342 | likely(skb_headroom(skb) >= ETH_HLEN)) { | |
d58ff351 | 343 | struct ethhdr *eth = skb_push(skb, ETH_HLEN); |
dcdd43c4 DA |
344 | |
345 | ether_addr_copy(eth->h_source, vrf_dev->dev_addr); | |
346 | eth_zero_addr(eth->h_dest); | |
347 | eth->h_proto = skb->protocol; | |
348 | ||
349 | rcu_read_lock_bh(); | |
350 | dev_queue_xmit_nit(skb, vrf_dev); | |
351 | rcu_read_unlock_bh(); | |
352 | ||
353 | skb_pull(skb, ETH_HLEN); | |
354 | } | |
355 | ||
356 | return 1; | |
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; | |
fdfc428e | 366 | const struct in6_addr *nexthop; |
35402e31 | 367 | struct neighbour *neigh; |
35402e31 DA |
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)) { | |
4ff06203 | 381 | sock_confirm_neigh(skb, neigh); |
c16ec185 | 382 | ret = neigh_output(neigh, skb); |
35402e31 DA |
383 | rcu_read_unlock_bh(); |
384 | return ret; | |
385 | } | |
386 | rcu_read_unlock_bh(); | |
387 | ||
388 | IP6_INC_STATS(dev_net(dst->dev), | |
389 | ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES); | |
390 | kfree_skb(skb); | |
391 | return -EINVAL; | |
392 | } | |
393 | ||
394 | /* modelled after ip6_output */ | |
395 | static int vrf_output6(struct net *net, struct sock *sk, struct sk_buff *skb) | |
396 | { | |
397 | return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING, | |
398 | net, sk, skb, NULL, skb_dst(skb)->dev, | |
399 | vrf_finish_output6, | |
400 | !(IP6CB(skb)->flags & IP6SKB_REROUTED)); | |
401 | } | |
402 | ||
4c1feac5 DA |
403 | /* set dst on skb to send packet to us via dev_xmit path. Allows |
404 | * packet to go through device based features such as qdisc, netfilter | |
405 | * hooks and packet sockets with skb->dev set to vrf device. | |
406 | */ | |
a9ec54d1 DA |
407 | static struct sk_buff *vrf_ip6_out_redirect(struct net_device *vrf_dev, |
408 | struct sk_buff *skb) | |
4c1feac5 DA |
409 | { |
410 | struct net_vrf *vrf = netdev_priv(vrf_dev); | |
411 | struct dst_entry *dst = NULL; | |
412 | struct rt6_info *rt6; | |
413 | ||
4c1feac5 DA |
414 | rcu_read_lock(); |
415 | ||
416 | rt6 = rcu_dereference(vrf->rt6); | |
417 | if (likely(rt6)) { | |
418 | dst = &rt6->dst; | |
419 | dst_hold(dst); | |
420 | } | |
421 | ||
422 | rcu_read_unlock(); | |
423 | ||
424 | if (unlikely(!dst)) { | |
425 | vrf_tx_error(vrf_dev, skb); | |
426 | return NULL; | |
427 | } | |
428 | ||
429 | skb_dst_drop(skb); | |
430 | skb_dst_set(skb, dst); | |
431 | ||
432 | return skb; | |
433 | } | |
434 | ||
a9ec54d1 DA |
435 | static int vrf_output6_direct(struct net *net, struct sock *sk, |
436 | struct sk_buff *skb) | |
437 | { | |
438 | skb->protocol = htons(ETH_P_IPV6); | |
439 | ||
440 | return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING, | |
441 | net, sk, skb, NULL, skb->dev, | |
442 | vrf_finish_direct, | |
443 | !(IPCB(skb)->flags & IPSKB_REROUTED)); | |
444 | } | |
445 | ||
446 | static struct sk_buff *vrf_ip6_out_direct(struct net_device *vrf_dev, | |
447 | struct sock *sk, | |
448 | struct sk_buff *skb) | |
449 | { | |
450 | struct net *net = dev_net(vrf_dev); | |
451 | int err; | |
452 | ||
453 | skb->dev = vrf_dev; | |
454 | ||
455 | err = nf_hook(NFPROTO_IPV6, NF_INET_LOCAL_OUT, net, sk, | |
456 | skb, NULL, vrf_dev, vrf_output6_direct); | |
457 | ||
458 | if (likely(err == 1)) | |
459 | err = vrf_output6_direct(net, sk, skb); | |
460 | ||
461 | /* reset skb device */ | |
462 | if (likely(err == 1)) | |
463 | nf_reset(skb); | |
464 | else | |
465 | skb = NULL; | |
466 | ||
467 | return skb; | |
468 | } | |
469 | ||
470 | static struct sk_buff *vrf_ip6_out(struct net_device *vrf_dev, | |
471 | struct sock *sk, | |
472 | struct sk_buff *skb) | |
473 | { | |
474 | /* don't divert link scope packets */ | |
475 | if (rt6_need_strict(&ipv6_hdr(skb)->daddr)) | |
476 | return skb; | |
477 | ||
478 | if (qdisc_tx_is_default(vrf_dev)) | |
479 | return vrf_ip6_out_direct(vrf_dev, sk, skb); | |
480 | ||
481 | return vrf_ip6_out_redirect(vrf_dev, skb); | |
482 | } | |
483 | ||
b0e95ccd | 484 | /* holding rtnl */ |
810e530b | 485 | static void vrf_rt6_release(struct net_device *dev, struct net_vrf *vrf) |
35402e31 | 486 | { |
b0e95ccd | 487 | struct rt6_info *rt6 = rtnl_dereference(vrf->rt6); |
810e530b DA |
488 | struct net *net = dev_net(dev); |
489 | struct dst_entry *dst; | |
b0e95ccd | 490 | |
b4869aa2 | 491 | RCU_INIT_POINTER(vrf->rt6, NULL); |
b4869aa2 | 492 | synchronize_rcu(); |
b0e95ccd | 493 | |
810e530b DA |
494 | /* move dev in dst's to loopback so this VRF device can be deleted |
495 | * - based on dst_ifdown | |
496 | */ | |
497 | if (rt6) { | |
498 | dst = &rt6->dst; | |
499 | dev_put(dst->dev); | |
500 | dst->dev = net->loopback_dev; | |
501 | dev_hold(dst->dev); | |
502 | dst_release(dst); | |
503 | } | |
35402e31 DA |
504 | } |
505 | ||
506 | static int vrf_rt6_create(struct net_device *dev) | |
507 | { | |
a4c2fd7f | 508 | int flags = DST_HOST | DST_NOPOLICY | DST_NOXFRM; |
35402e31 | 509 | struct net_vrf *vrf = netdev_priv(dev); |
9ab179d8 | 510 | struct net *net = dev_net(dev); |
b3b4663c | 511 | struct fib6_table *rt6i_table; |
4f04256c | 512 | struct rt6_info *rt6; |
35402e31 DA |
513 | int rc = -ENOMEM; |
514 | ||
e4348637 DA |
515 | /* IPv6 can be CONFIG enabled and then disabled runtime */ |
516 | if (!ipv6_mod_enabled()) | |
517 | return 0; | |
518 | ||
b3b4663c DA |
519 | rt6i_table = fib6_new_table(net, vrf->tb_id); |
520 | if (!rt6i_table) | |
521 | goto out; | |
522 | ||
b4869aa2 DA |
523 | /* create a dst for routing packets out a VRF device */ |
524 | rt6 = ip6_dst_alloc(net, dev, flags); | |
35402e31 DA |
525 | if (!rt6) |
526 | goto out; | |
527 | ||
b3b4663c DA |
528 | rt6->rt6i_table = rt6i_table; |
529 | rt6->dst.output = vrf_output6; | |
b4869aa2 | 530 | |
b0e95ccd DA |
531 | rcu_assign_pointer(vrf->rt6, rt6); |
532 | ||
35402e31 DA |
533 | rc = 0; |
534 | out: | |
535 | return rc; | |
536 | } | |
537 | #else | |
4c1feac5 DA |
538 | static struct sk_buff *vrf_ip6_out(struct net_device *vrf_dev, |
539 | struct sock *sk, | |
540 | struct sk_buff *skb) | |
541 | { | |
542 | return skb; | |
543 | } | |
544 | ||
810e530b | 545 | static void vrf_rt6_release(struct net_device *dev, struct net_vrf *vrf) |
35402e31 DA |
546 | { |
547 | } | |
548 | ||
549 | static int vrf_rt6_create(struct net_device *dev) | |
550 | { | |
551 | return 0; | |
552 | } | |
553 | #endif | |
554 | ||
8f58336d | 555 | /* modelled after ip_finish_output2 */ |
0c4b51f0 | 556 | static int vrf_finish_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
193125db | 557 | { |
8f58336d DA |
558 | struct dst_entry *dst = skb_dst(skb); |
559 | struct rtable *rt = (struct rtable *)dst; | |
560 | struct net_device *dev = dst->dev; | |
561 | unsigned int hh_len = LL_RESERVED_SPACE(dev); | |
562 | struct neighbour *neigh; | |
563 | u32 nexthop; | |
564 | int ret = -EINVAL; | |
565 | ||
eb63ecc1 DA |
566 | nf_reset(skb); |
567 | ||
8f58336d DA |
568 | /* Be paranoid, rather than too clever. */ |
569 | if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) { | |
570 | struct sk_buff *skb2; | |
571 | ||
572 | skb2 = skb_realloc_headroom(skb, LL_RESERVED_SPACE(dev)); | |
573 | if (!skb2) { | |
574 | ret = -ENOMEM; | |
575 | goto err; | |
576 | } | |
577 | if (skb->sk) | |
578 | skb_set_owner_w(skb2, skb->sk); | |
579 | ||
580 | consume_skb(skb); | |
581 | skb = skb2; | |
582 | } | |
583 | ||
584 | rcu_read_lock_bh(); | |
585 | ||
586 | nexthop = (__force u32)rt_nexthop(rt, ip_hdr(skb)->daddr); | |
587 | neigh = __ipv4_neigh_lookup_noref(dev, nexthop); | |
588 | if (unlikely(!neigh)) | |
589 | neigh = __neigh_create(&arp_tbl, &nexthop, dev, false); | |
4ff06203 JA |
590 | if (!IS_ERR(neigh)) { |
591 | sock_confirm_neigh(skb, neigh); | |
c16ec185 | 592 | ret = neigh_output(neigh, skb); |
20029940 DA |
593 | rcu_read_unlock_bh(); |
594 | return ret; | |
4ff06203 | 595 | } |
8f58336d DA |
596 | |
597 | rcu_read_unlock_bh(); | |
598 | err: | |
20029940 | 599 | vrf_tx_error(skb->dev, skb); |
8f58336d | 600 | return ret; |
193125db DA |
601 | } |
602 | ||
ede2059d | 603 | static int vrf_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
193125db DA |
604 | { |
605 | struct net_device *dev = skb_dst(skb)->dev; | |
606 | ||
29a26a56 | 607 | IP_UPD_PO_STATS(net, IPSTATS_MIB_OUT, skb->len); |
193125db DA |
608 | |
609 | skb->dev = dev; | |
610 | skb->protocol = htons(ETH_P_IP); | |
611 | ||
29a26a56 EB |
612 | return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING, |
613 | net, sk, skb, NULL, dev, | |
8f58336d | 614 | vrf_finish_output, |
193125db DA |
615 | !(IPCB(skb)->flags & IPSKB_REROUTED)); |
616 | } | |
617 | ||
ebfc102c DA |
618 | /* set dst on skb to send packet to us via dev_xmit path. Allows |
619 | * packet to go through device based features such as qdisc, netfilter | |
620 | * hooks and packet sockets with skb->dev set to vrf device. | |
621 | */ | |
dcdd43c4 DA |
622 | static struct sk_buff *vrf_ip_out_redirect(struct net_device *vrf_dev, |
623 | struct sk_buff *skb) | |
ebfc102c DA |
624 | { |
625 | struct net_vrf *vrf = netdev_priv(vrf_dev); | |
626 | struct dst_entry *dst = NULL; | |
627 | struct rtable *rth; | |
628 | ||
629 | rcu_read_lock(); | |
630 | ||
631 | rth = rcu_dereference(vrf->rth); | |
632 | if (likely(rth)) { | |
633 | dst = &rth->dst; | |
634 | dst_hold(dst); | |
635 | } | |
636 | ||
637 | rcu_read_unlock(); | |
638 | ||
639 | if (unlikely(!dst)) { | |
640 | vrf_tx_error(vrf_dev, skb); | |
641 | return NULL; | |
642 | } | |
643 | ||
644 | skb_dst_drop(skb); | |
645 | skb_dst_set(skb, dst); | |
646 | ||
647 | return skb; | |
648 | } | |
649 | ||
dcdd43c4 DA |
650 | static int vrf_output_direct(struct net *net, struct sock *sk, |
651 | struct sk_buff *skb) | |
652 | { | |
653 | skb->protocol = htons(ETH_P_IP); | |
654 | ||
655 | return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING, | |
656 | net, sk, skb, NULL, skb->dev, | |
657 | vrf_finish_direct, | |
658 | !(IPCB(skb)->flags & IPSKB_REROUTED)); | |
659 | } | |
660 | ||
661 | static struct sk_buff *vrf_ip_out_direct(struct net_device *vrf_dev, | |
662 | struct sock *sk, | |
663 | struct sk_buff *skb) | |
664 | { | |
665 | struct net *net = dev_net(vrf_dev); | |
666 | int err; | |
667 | ||
668 | skb->dev = vrf_dev; | |
669 | ||
670 | err = nf_hook(NFPROTO_IPV4, NF_INET_LOCAL_OUT, net, sk, | |
671 | skb, NULL, vrf_dev, vrf_output_direct); | |
672 | ||
673 | if (likely(err == 1)) | |
674 | err = vrf_output_direct(net, sk, skb); | |
675 | ||
676 | /* reset skb device */ | |
677 | if (likely(err == 1)) | |
678 | nf_reset(skb); | |
679 | else | |
680 | skb = NULL; | |
681 | ||
682 | return skb; | |
683 | } | |
684 | ||
685 | static struct sk_buff *vrf_ip_out(struct net_device *vrf_dev, | |
686 | struct sock *sk, | |
687 | struct sk_buff *skb) | |
688 | { | |
1e19c4d6 DA |
689 | /* don't divert multicast or local broadcast */ |
690 | if (ipv4_is_multicast(ip_hdr(skb)->daddr) || | |
691 | ipv4_is_lbcast(ip_hdr(skb)->daddr)) | |
dcdd43c4 DA |
692 | return skb; |
693 | ||
694 | if (qdisc_tx_is_default(vrf_dev)) | |
695 | return vrf_ip_out_direct(vrf_dev, sk, skb); | |
696 | ||
697 | return vrf_ip_out_redirect(vrf_dev, skb); | |
698 | } | |
699 | ||
ebfc102c DA |
700 | /* called with rcu lock held */ |
701 | static struct sk_buff *vrf_l3_out(struct net_device *vrf_dev, | |
702 | struct sock *sk, | |
703 | struct sk_buff *skb, | |
704 | u16 proto) | |
705 | { | |
706 | switch (proto) { | |
707 | case AF_INET: | |
708 | return vrf_ip_out(vrf_dev, sk, skb); | |
4c1feac5 DA |
709 | case AF_INET6: |
710 | return vrf_ip6_out(vrf_dev, sk, skb); | |
ebfc102c DA |
711 | } |
712 | ||
713 | return skb; | |
714 | } | |
715 | ||
b0e95ccd | 716 | /* holding rtnl */ |
810e530b | 717 | static void vrf_rtable_release(struct net_device *dev, struct net_vrf *vrf) |
193125db | 718 | { |
b0e95ccd | 719 | struct rtable *rth = rtnl_dereference(vrf->rth); |
810e530b DA |
720 | struct net *net = dev_net(dev); |
721 | struct dst_entry *dst; | |
b0e95ccd | 722 | |
afe80a49 | 723 | RCU_INIT_POINTER(vrf->rth, NULL); |
afe80a49 | 724 | synchronize_rcu(); |
193125db | 725 | |
810e530b DA |
726 | /* move dev in dst's to loopback so this VRF device can be deleted |
727 | * - based on dst_ifdown | |
728 | */ | |
729 | if (rth) { | |
730 | dst = &rth->dst; | |
731 | dev_put(dst->dev); | |
732 | dst->dev = net->loopback_dev; | |
733 | dev_hold(dst->dev); | |
734 | dst_release(dst); | |
735 | } | |
193125db DA |
736 | } |
737 | ||
b0e95ccd | 738 | static int vrf_rtable_create(struct net_device *dev) |
193125db | 739 | { |
b7503e0c | 740 | struct net_vrf *vrf = netdev_priv(dev); |
4f04256c | 741 | struct rtable *rth; |
193125db | 742 | |
b3b4663c | 743 | if (!fib_new_table(dev_net(dev), vrf->tb_id)) |
b0e95ccd | 744 | return -ENOMEM; |
b3b4663c | 745 | |
afe80a49 | 746 | /* create a dst for routing packets out through a VRF device */ |
9ab179d8 | 747 | rth = rt_dst_alloc(dev, 0, RTN_UNICAST, 1, 1, 0); |
b0e95ccd DA |
748 | if (!rth) |
749 | return -ENOMEM; | |
193125db | 750 | |
b0e95ccd DA |
751 | rth->dst.output = vrf_output; |
752 | rth->rt_table_id = vrf->tb_id; | |
753 | ||
754 | rcu_assign_pointer(vrf->rth, rth); | |
755 | ||
756 | return 0; | |
193125db DA |
757 | } |
758 | ||
759 | /**************************** device handling ********************/ | |
760 | ||
761 | /* cycle interface to flush neighbor cache and move routes across tables */ | |
762 | static void cycle_netdev(struct net_device *dev) | |
763 | { | |
764 | unsigned int flags = dev->flags; | |
765 | int ret; | |
766 | ||
767 | if (!netif_running(dev)) | |
768 | return; | |
769 | ||
770 | ret = dev_change_flags(dev, flags & ~IFF_UP); | |
771 | if (ret >= 0) | |
772 | ret = dev_change_flags(dev, flags); | |
773 | ||
774 | if (ret < 0) { | |
775 | netdev_err(dev, | |
776 | "Failed to cycle device %s; route tables might be wrong!\n", | |
777 | dev->name); | |
778 | } | |
779 | } | |
780 | ||
42ab19ee DA |
781 | static int do_vrf_add_slave(struct net_device *dev, struct net_device *port_dev, |
782 | struct netlink_ext_ack *extack) | |
193125db | 783 | { |
bad53162 | 784 | int ret; |
193125db | 785 | |
26d31ac1 DA |
786 | /* do not allow loopback device to be enslaved to a VRF. |
787 | * The vrf device acts as the loopback for the vrf. | |
788 | */ | |
de3baa3e DA |
789 | if (port_dev == dev_net(dev)->loopback_dev) { |
790 | NL_SET_ERR_MSG(extack, | |
791 | "Can not enslave loopback device to a VRF"); | |
26d31ac1 | 792 | return -EOPNOTSUPP; |
de3baa3e | 793 | } |
26d31ac1 | 794 | |
fdeea7be | 795 | port_dev->priv_flags |= IFF_L3MDEV_SLAVE; |
42ab19ee | 796 | ret = netdev_master_upper_dev_link(port_dev, dev, NULL, NULL, extack); |
193125db | 797 | if (ret < 0) |
fdeea7be | 798 | goto err; |
193125db | 799 | |
193125db DA |
800 | cycle_netdev(port_dev); |
801 | ||
802 | return 0; | |
fdeea7be IS |
803 | |
804 | err: | |
805 | port_dev->priv_flags &= ~IFF_L3MDEV_SLAVE; | |
806 | return ret; | |
193125db DA |
807 | } |
808 | ||
33eaf2a6 DA |
809 | static int vrf_add_slave(struct net_device *dev, struct net_device *port_dev, |
810 | struct netlink_ext_ack *extack) | |
193125db | 811 | { |
de3baa3e DA |
812 | if (netif_is_l3_master(port_dev)) { |
813 | NL_SET_ERR_MSG(extack, | |
814 | "Can not enslave an L3 master device to a VRF"); | |
815 | return -EINVAL; | |
816 | } | |
817 | ||
818 | if (netif_is_l3_slave(port_dev)) | |
193125db DA |
819 | return -EINVAL; |
820 | ||
42ab19ee | 821 | return do_vrf_add_slave(dev, port_dev, extack); |
193125db DA |
822 | } |
823 | ||
824 | /* inverse of do_vrf_add_slave */ | |
825 | static int do_vrf_del_slave(struct net_device *dev, struct net_device *port_dev) | |
826 | { | |
193125db | 827 | netdev_upper_dev_unlink(port_dev, dev); |
fee6d4c7 | 828 | port_dev->priv_flags &= ~IFF_L3MDEV_SLAVE; |
193125db | 829 | |
193125db DA |
830 | cycle_netdev(port_dev); |
831 | ||
193125db DA |
832 | return 0; |
833 | } | |
834 | ||
835 | static int vrf_del_slave(struct net_device *dev, struct net_device *port_dev) | |
836 | { | |
193125db DA |
837 | return do_vrf_del_slave(dev, port_dev); |
838 | } | |
839 | ||
840 | static void vrf_dev_uninit(struct net_device *dev) | |
841 | { | |
842 | struct net_vrf *vrf = netdev_priv(dev); | |
193125db | 843 | |
810e530b DA |
844 | vrf_rtable_release(dev, vrf); |
845 | vrf_rt6_release(dev, vrf); | |
193125db | 846 | |
3a4a27d3 | 847 | free_percpu(dev->dstats); |
193125db DA |
848 | dev->dstats = NULL; |
849 | } | |
850 | ||
851 | static int vrf_dev_init(struct net_device *dev) | |
852 | { | |
853 | struct net_vrf *vrf = netdev_priv(dev); | |
854 | ||
193125db DA |
855 | dev->dstats = netdev_alloc_pcpu_stats(struct pcpu_dstats); |
856 | if (!dev->dstats) | |
857 | goto out_nomem; | |
858 | ||
859 | /* create the default dst which points back to us */ | |
b0e95ccd | 860 | if (vrf_rtable_create(dev) != 0) |
193125db DA |
861 | goto out_stats; |
862 | ||
35402e31 DA |
863 | if (vrf_rt6_create(dev) != 0) |
864 | goto out_rth; | |
865 | ||
193125db DA |
866 | dev->flags = IFF_MASTER | IFF_NOARP; |
867 | ||
b87ab6b8 DA |
868 | /* MTU is irrelevant for VRF device; set to 64k similar to lo */ |
869 | dev->mtu = 64 * 1024; | |
870 | ||
871 | /* similarly, oper state is irrelevant; set to up to avoid confusion */ | |
872 | dev->operstate = IF_OPER_UP; | |
78e7a2ae | 873 | netdev_lockdep_set_classes(dev); |
193125db DA |
874 | return 0; |
875 | ||
35402e31 | 876 | out_rth: |
810e530b | 877 | vrf_rtable_release(dev, vrf); |
193125db DA |
878 | out_stats: |
879 | free_percpu(dev->dstats); | |
880 | dev->dstats = NULL; | |
881 | out_nomem: | |
882 | return -ENOMEM; | |
883 | } | |
884 | ||
885 | static const struct net_device_ops vrf_netdev_ops = { | |
886 | .ndo_init = vrf_dev_init, | |
887 | .ndo_uninit = vrf_dev_uninit, | |
888 | .ndo_start_xmit = vrf_xmit, | |
889 | .ndo_get_stats64 = vrf_get_stats64, | |
890 | .ndo_add_slave = vrf_add_slave, | |
891 | .ndo_del_slave = vrf_del_slave, | |
892 | }; | |
893 | ||
ee15ee5d DA |
894 | static u32 vrf_fib_table(const struct net_device *dev) |
895 | { | |
896 | struct net_vrf *vrf = netdev_priv(dev); | |
897 | ||
898 | return vrf->tb_id; | |
899 | } | |
900 | ||
73e20b76 DA |
901 | static int vrf_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb) |
902 | { | |
1a4a5bf5 | 903 | kfree_skb(skb); |
73e20b76 DA |
904 | return 0; |
905 | } | |
906 | ||
907 | static struct sk_buff *vrf_rcv_nfhook(u8 pf, unsigned int hook, | |
908 | struct sk_buff *skb, | |
909 | struct net_device *dev) | |
910 | { | |
911 | struct net *net = dev_net(dev); | |
912 | ||
1a4a5bf5 | 913 | if (nf_hook(pf, hook, net, NULL, skb, dev, NULL, vrf_rcv_finish) != 1) |
73e20b76 DA |
914 | skb = NULL; /* kfree_skb(skb) handled by nf code */ |
915 | ||
916 | return skb; | |
917 | } | |
918 | ||
74b20582 DA |
919 | #if IS_ENABLED(CONFIG_IPV6) |
920 | /* neighbor handling is done with actual device; do not want | |
921 | * to flip skb->dev for those ndisc packets. This really fails | |
922 | * for multiple next protocols (e.g., NEXTHDR_HOP). But it is | |
923 | * a start. | |
924 | */ | |
925 | static bool ipv6_ndisc_frame(const struct sk_buff *skb) | |
926 | { | |
927 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
928 | bool rc = false; | |
929 | ||
930 | if (iph->nexthdr == NEXTHDR_ICMP) { | |
931 | const struct icmp6hdr *icmph; | |
932 | struct icmp6hdr _icmph; | |
933 | ||
934 | icmph = skb_header_pointer(skb, sizeof(*iph), | |
935 | sizeof(_icmph), &_icmph); | |
936 | if (!icmph) | |
937 | goto out; | |
938 | ||
939 | switch (icmph->icmp6_type) { | |
940 | case NDISC_ROUTER_SOLICITATION: | |
941 | case NDISC_ROUTER_ADVERTISEMENT: | |
942 | case NDISC_NEIGHBOUR_SOLICITATION: | |
943 | case NDISC_NEIGHBOUR_ADVERTISEMENT: | |
944 | case NDISC_REDIRECT: | |
945 | rc = true; | |
946 | break; | |
947 | } | |
948 | } | |
949 | ||
950 | out: | |
951 | return rc; | |
952 | } | |
953 | ||
9ff74384 DA |
954 | static struct rt6_info *vrf_ip6_route_lookup(struct net *net, |
955 | const struct net_device *dev, | |
956 | struct flowi6 *fl6, | |
957 | int ifindex, | |
958 | int flags) | |
959 | { | |
960 | struct net_vrf *vrf = netdev_priv(dev); | |
961 | struct fib6_table *table = NULL; | |
962 | struct rt6_info *rt6; | |
963 | ||
964 | rcu_read_lock(); | |
965 | ||
966 | /* fib6_table does not have a refcnt and can not be freed */ | |
967 | rt6 = rcu_dereference(vrf->rt6); | |
968 | if (likely(rt6)) | |
969 | table = rt6->rt6i_table; | |
970 | ||
971 | rcu_read_unlock(); | |
972 | ||
973 | if (!table) | |
974 | return NULL; | |
975 | ||
976 | return ip6_pol_route(net, table, ifindex, fl6, flags); | |
977 | } | |
978 | ||
979 | static void vrf_ip6_input_dst(struct sk_buff *skb, struct net_device *vrf_dev, | |
980 | int ifindex) | |
981 | { | |
982 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
983 | struct flowi6 fl6 = { | |
ecf09117 AB |
984 | .flowi6_iif = ifindex, |
985 | .flowi6_mark = skb->mark, | |
986 | .flowi6_proto = iph->nexthdr, | |
9ff74384 DA |
987 | .daddr = iph->daddr, |
988 | .saddr = iph->saddr, | |
989 | .flowlabel = ip6_flowinfo(iph), | |
9ff74384 DA |
990 | }; |
991 | struct net *net = dev_net(vrf_dev); | |
992 | struct rt6_info *rt6; | |
993 | ||
994 | rt6 = vrf_ip6_route_lookup(net, vrf_dev, &fl6, ifindex, | |
995 | RT6_LOOKUP_F_HAS_SADDR | RT6_LOOKUP_F_IFACE); | |
996 | if (unlikely(!rt6)) | |
997 | return; | |
998 | ||
999 | if (unlikely(&rt6->dst == &net->ipv6.ip6_null_entry->dst)) | |
1000 | return; | |
1001 | ||
1002 | skb_dst_set(skb, &rt6->dst); | |
1003 | } | |
1004 | ||
74b20582 DA |
1005 | static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev, |
1006 | struct sk_buff *skb) | |
1007 | { | |
9ff74384 | 1008 | int orig_iif = skb->skb_iif; |
906f2a1d MM |
1009 | bool need_strict = rt6_need_strict(&ipv6_hdr(skb)->daddr); |
1010 | bool is_ndisc = ipv6_ndisc_frame(skb); | |
9ff74384 | 1011 | |
906f2a1d MM |
1012 | /* loopback, multicast & non-ND link-local traffic; do not push through |
1013 | * packet taps again. Reset pkt_type for upper layers to process skb | |
b4869aa2 | 1014 | */ |
906f2a1d | 1015 | if (skb->pkt_type == PACKET_LOOPBACK || (need_strict && !is_ndisc)) { |
b4869aa2 DA |
1016 | skb->dev = vrf_dev; |
1017 | skb->skb_iif = vrf_dev->ifindex; | |
a04a480d | 1018 | IP6CB(skb)->flags |= IP6SKB_L3SLAVE; |
906f2a1d MM |
1019 | if (skb->pkt_type == PACKET_LOOPBACK) |
1020 | skb->pkt_type = PACKET_HOST; | |
b4869aa2 DA |
1021 | goto out; |
1022 | } | |
1023 | ||
906f2a1d MM |
1024 | /* if packet is NDISC then keep the ingress interface */ |
1025 | if (!is_ndisc) { | |
926d93a3 | 1026 | vrf_rx_stats(vrf_dev, skb->len); |
74b20582 DA |
1027 | skb->dev = vrf_dev; |
1028 | skb->skb_iif = vrf_dev->ifindex; | |
1029 | ||
a9ec54d1 DA |
1030 | if (!list_empty(&vrf_dev->ptype_all)) { |
1031 | skb_push(skb, skb->mac_len); | |
1032 | dev_queue_xmit_nit(skb, vrf_dev); | |
1033 | skb_pull(skb, skb->mac_len); | |
1034 | } | |
74b20582 DA |
1035 | |
1036 | IP6CB(skb)->flags |= IP6SKB_L3SLAVE; | |
1037 | } | |
1038 | ||
9ff74384 DA |
1039 | if (need_strict) |
1040 | vrf_ip6_input_dst(skb, vrf_dev, orig_iif); | |
1041 | ||
73e20b76 | 1042 | skb = vrf_rcv_nfhook(NFPROTO_IPV6, NF_INET_PRE_ROUTING, skb, vrf_dev); |
b4869aa2 | 1043 | out: |
74b20582 DA |
1044 | return skb; |
1045 | } | |
1046 | ||
1047 | #else | |
1048 | static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev, | |
1049 | struct sk_buff *skb) | |
1050 | { | |
1051 | return skb; | |
1052 | } | |
1053 | #endif | |
1054 | ||
1055 | static struct sk_buff *vrf_ip_rcv(struct net_device *vrf_dev, | |
1056 | struct sk_buff *skb) | |
1057 | { | |
1058 | skb->dev = vrf_dev; | |
1059 | skb->skb_iif = vrf_dev->ifindex; | |
a04a480d | 1060 | IPCB(skb)->flags |= IPSKB_L3SLAVE; |
74b20582 | 1061 | |
e58e4159 DA |
1062 | if (ipv4_is_multicast(ip_hdr(skb)->daddr)) |
1063 | goto out; | |
1064 | ||
afe80a49 DA |
1065 | /* loopback traffic; do not push through packet taps again. |
1066 | * Reset pkt_type for upper layers to process skb | |
1067 | */ | |
1068 | if (skb->pkt_type == PACKET_LOOPBACK) { | |
1069 | skb->pkt_type = PACKET_HOST; | |
1070 | goto out; | |
1071 | } | |
1072 | ||
926d93a3 DA |
1073 | vrf_rx_stats(vrf_dev, skb->len); |
1074 | ||
dcdd43c4 DA |
1075 | if (!list_empty(&vrf_dev->ptype_all)) { |
1076 | skb_push(skb, skb->mac_len); | |
1077 | dev_queue_xmit_nit(skb, vrf_dev); | |
1078 | skb_pull(skb, skb->mac_len); | |
1079 | } | |
74b20582 | 1080 | |
73e20b76 | 1081 | skb = vrf_rcv_nfhook(NFPROTO_IPV4, NF_INET_PRE_ROUTING, skb, vrf_dev); |
afe80a49 | 1082 | out: |
74b20582 DA |
1083 | return skb; |
1084 | } | |
1085 | ||
1086 | /* called with rcu lock held */ | |
1087 | static struct sk_buff *vrf_l3_rcv(struct net_device *vrf_dev, | |
1088 | struct sk_buff *skb, | |
1089 | u16 proto) | |
1090 | { | |
1091 | switch (proto) { | |
1092 | case AF_INET: | |
1093 | return vrf_ip_rcv(vrf_dev, skb); | |
1094 | case AF_INET6: | |
1095 | return vrf_ip6_rcv(vrf_dev, skb); | |
1096 | } | |
1097 | ||
1098 | return skb; | |
1099 | } | |
1100 | ||
35402e31 | 1101 | #if IS_ENABLED(CONFIG_IPV6) |
4c1feac5 DA |
1102 | /* send to link-local or multicast address via interface enslaved to |
1103 | * VRF device. Force lookup to VRF table without changing flow struct | |
1104 | */ | |
1105 | static struct dst_entry *vrf_link_scope_lookup(const struct net_device *dev, | |
1106 | struct flowi6 *fl6) | |
35402e31 | 1107 | { |
9ff74384 | 1108 | struct net *net = dev_net(dev); |
4c1feac5 | 1109 | int flags = RT6_LOOKUP_F_IFACE; |
b0e95ccd | 1110 | struct dst_entry *dst = NULL; |
9ff74384 | 1111 | struct rt6_info *rt; |
35402e31 | 1112 | |
4c1feac5 DA |
1113 | /* VRF device does not have a link-local address and |
1114 | * sending packets to link-local or mcast addresses over | |
1115 | * a VRF device does not make sense | |
1116 | */ | |
1117 | if (fl6->flowi6_oif == dev->ifindex) { | |
1118 | dst = &net->ipv6.ip6_null_entry->dst; | |
1119 | dst_hold(dst); | |
1120 | return dst; | |
35402e31 DA |
1121 | } |
1122 | ||
4c1feac5 DA |
1123 | if (!ipv6_addr_any(&fl6->saddr)) |
1124 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
1125 | ||
1126 | rt = vrf_ip6_route_lookup(net, dev, fl6, fl6->flowi6_oif, flags); | |
1127 | if (rt) | |
1128 | dst = &rt->dst; | |
9ff74384 | 1129 | |
b0e95ccd | 1130 | return dst; |
35402e31 DA |
1131 | } |
1132 | #endif | |
1133 | ||
ee15ee5d DA |
1134 | static const struct l3mdev_ops vrf_l3mdev_ops = { |
1135 | .l3mdev_fib_table = vrf_fib_table, | |
74b20582 | 1136 | .l3mdev_l3_rcv = vrf_l3_rcv, |
ebfc102c | 1137 | .l3mdev_l3_out = vrf_l3_out, |
35402e31 | 1138 | #if IS_ENABLED(CONFIG_IPV6) |
4c1feac5 | 1139 | .l3mdev_link_scope_lookup = vrf_link_scope_lookup, |
35402e31 | 1140 | #endif |
ee15ee5d DA |
1141 | }; |
1142 | ||
193125db DA |
1143 | static void vrf_get_drvinfo(struct net_device *dev, |
1144 | struct ethtool_drvinfo *info) | |
1145 | { | |
1146 | strlcpy(info->driver, DRV_NAME, sizeof(info->driver)); | |
1147 | strlcpy(info->version, DRV_VERSION, sizeof(info->version)); | |
1148 | } | |
1149 | ||
1150 | static const struct ethtool_ops vrf_ethtool_ops = { | |
1151 | .get_drvinfo = vrf_get_drvinfo, | |
1152 | }; | |
1153 | ||
1aa6c4f6 DA |
1154 | static inline size_t vrf_fib_rule_nl_size(void) |
1155 | { | |
1156 | size_t sz; | |
1157 | ||
1158 | sz = NLMSG_ALIGN(sizeof(struct fib_rule_hdr)); | |
1159 | sz += nla_total_size(sizeof(u8)); /* FRA_L3MDEV */ | |
1160 | sz += nla_total_size(sizeof(u32)); /* FRA_PRIORITY */ | |
1161 | ||
1162 | return sz; | |
1163 | } | |
1164 | ||
1165 | static int vrf_fib_rule(const struct net_device *dev, __u8 family, bool add_it) | |
1166 | { | |
1167 | struct fib_rule_hdr *frh; | |
1168 | struct nlmsghdr *nlh; | |
1169 | struct sk_buff *skb; | |
1170 | int err; | |
1171 | ||
e4348637 DA |
1172 | if (family == AF_INET6 && !ipv6_mod_enabled()) |
1173 | return 0; | |
1174 | ||
1aa6c4f6 DA |
1175 | skb = nlmsg_new(vrf_fib_rule_nl_size(), GFP_KERNEL); |
1176 | if (!skb) | |
1177 | return -ENOMEM; | |
1178 | ||
1179 | nlh = nlmsg_put(skb, 0, 0, 0, sizeof(*frh), 0); | |
1180 | if (!nlh) | |
1181 | goto nla_put_failure; | |
1182 | ||
1183 | /* rule only needs to appear once */ | |
426c87ca | 1184 | nlh->nlmsg_flags |= NLM_F_EXCL; |
1aa6c4f6 DA |
1185 | |
1186 | frh = nlmsg_data(nlh); | |
1187 | memset(frh, 0, sizeof(*frh)); | |
1188 | frh->family = family; | |
1189 | frh->action = FR_ACT_TO_TBL; | |
1190 | ||
18129a24 | 1191 | if (nla_put_u8(skb, FRA_L3MDEV, 1)) |
1aa6c4f6 DA |
1192 | goto nla_put_failure; |
1193 | ||
1194 | if (nla_put_u32(skb, FRA_PRIORITY, FIB_RULE_PREF)) | |
1195 | goto nla_put_failure; | |
1196 | ||
1197 | nlmsg_end(skb, nlh); | |
1198 | ||
1199 | /* fib_nl_{new,del}rule handling looks for net from skb->sk */ | |
1200 | skb->sk = dev_net(dev)->rtnl; | |
1201 | if (add_it) { | |
c21ef3e3 | 1202 | err = fib_nl_newrule(skb, nlh, NULL); |
1aa6c4f6 DA |
1203 | if (err == -EEXIST) |
1204 | err = 0; | |
1205 | } else { | |
c21ef3e3 | 1206 | err = fib_nl_delrule(skb, nlh, NULL); |
1aa6c4f6 DA |
1207 | if (err == -ENOENT) |
1208 | err = 0; | |
1209 | } | |
1210 | nlmsg_free(skb); | |
1211 | ||
1212 | return err; | |
1213 | ||
1214 | nla_put_failure: | |
1215 | nlmsg_free(skb); | |
1216 | ||
1217 | return -EMSGSIZE; | |
1218 | } | |
1219 | ||
1220 | static int vrf_add_fib_rules(const struct net_device *dev) | |
1221 | { | |
1222 | int err; | |
1223 | ||
1224 | err = vrf_fib_rule(dev, AF_INET, true); | |
1225 | if (err < 0) | |
1226 | goto out_err; | |
1227 | ||
1228 | err = vrf_fib_rule(dev, AF_INET6, true); | |
1229 | if (err < 0) | |
1230 | goto ipv6_err; | |
1231 | ||
e58e4159 DA |
1232 | #if IS_ENABLED(CONFIG_IP_MROUTE_MULTIPLE_TABLES) |
1233 | err = vrf_fib_rule(dev, RTNL_FAMILY_IPMR, true); | |
1234 | if (err < 0) | |
1235 | goto ipmr_err; | |
1236 | #endif | |
1237 | ||
1aa6c4f6 DA |
1238 | return 0; |
1239 | ||
e58e4159 DA |
1240 | #if IS_ENABLED(CONFIG_IP_MROUTE_MULTIPLE_TABLES) |
1241 | ipmr_err: | |
1242 | vrf_fib_rule(dev, AF_INET6, false); | |
1243 | #endif | |
1244 | ||
1aa6c4f6 DA |
1245 | ipv6_err: |
1246 | vrf_fib_rule(dev, AF_INET, false); | |
1247 | ||
1248 | out_err: | |
1249 | netdev_err(dev, "Failed to add FIB rules.\n"); | |
1250 | return err; | |
1251 | } | |
1252 | ||
193125db DA |
1253 | static void vrf_setup(struct net_device *dev) |
1254 | { | |
1255 | ether_setup(dev); | |
1256 | ||
1257 | /* Initialize the device structure. */ | |
1258 | dev->netdev_ops = &vrf_netdev_ops; | |
ee15ee5d | 1259 | dev->l3mdev_ops = &vrf_l3mdev_ops; |
193125db | 1260 | dev->ethtool_ops = &vrf_ethtool_ops; |
cf124db5 | 1261 | dev->needs_free_netdev = true; |
193125db DA |
1262 | |
1263 | /* Fill in device structure with ethernet-generic values. */ | |
1264 | eth_hw_addr_random(dev); | |
1265 | ||
1266 | /* don't acquire vrf device's netif_tx_lock when transmitting */ | |
1267 | dev->features |= NETIF_F_LLTX; | |
1268 | ||
1269 | /* don't allow vrf devices to change network namespaces. */ | |
1270 | dev->features |= NETIF_F_NETNS_LOCAL; | |
7889681f DA |
1271 | |
1272 | /* does not make sense for a VLAN to be added to a vrf device */ | |
1273 | dev->features |= NETIF_F_VLAN_CHALLENGED; | |
1274 | ||
1275 | /* enable offload features */ | |
1276 | dev->features |= NETIF_F_GSO_SOFTWARE; | |
1277 | dev->features |= NETIF_F_RXCSUM | NETIF_F_HW_CSUM; | |
1278 | dev->features |= NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA; | |
1279 | ||
1280 | dev->hw_features = dev->features; | |
1281 | dev->hw_enc_features = dev->features; | |
1282 | ||
1283 | /* default to no qdisc; user can add if desired */ | |
1284 | dev->priv_flags |= IFF_NO_QUEUE; | |
193125db DA |
1285 | } |
1286 | ||
a8b8a889 MS |
1287 | static int vrf_validate(struct nlattr *tb[], struct nlattr *data[], |
1288 | struct netlink_ext_ack *extack) | |
193125db DA |
1289 | { |
1290 | if (tb[IFLA_ADDRESS]) { | |
53b94835 DA |
1291 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) { |
1292 | NL_SET_ERR_MSG(extack, "Invalid hardware address"); | |
193125db | 1293 | return -EINVAL; |
53b94835 DA |
1294 | } |
1295 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) { | |
1296 | NL_SET_ERR_MSG(extack, "Invalid hardware address"); | |
193125db | 1297 | return -EADDRNOTAVAIL; |
53b94835 | 1298 | } |
193125db DA |
1299 | } |
1300 | return 0; | |
1301 | } | |
1302 | ||
1303 | static void vrf_dellink(struct net_device *dev, struct list_head *head) | |
1304 | { | |
f630c38e NA |
1305 | struct net_device *port_dev; |
1306 | struct list_head *iter; | |
1307 | ||
1308 | netdev_for_each_lower_dev(dev, port_dev, iter) | |
1309 | vrf_del_slave(dev, port_dev); | |
1310 | ||
193125db DA |
1311 | unregister_netdevice_queue(dev, head); |
1312 | } | |
1313 | ||
1314 | static int vrf_newlink(struct net *src_net, struct net_device *dev, | |
7a3f4a18 MS |
1315 | struct nlattr *tb[], struct nlattr *data[], |
1316 | struct netlink_ext_ack *extack) | |
193125db DA |
1317 | { |
1318 | struct net_vrf *vrf = netdev_priv(dev); | |
097d3c95 DA |
1319 | bool *add_fib_rules; |
1320 | struct net *net; | |
1aa6c4f6 | 1321 | int err; |
193125db | 1322 | |
53b94835 DA |
1323 | if (!data || !data[IFLA_VRF_TABLE]) { |
1324 | NL_SET_ERR_MSG(extack, "VRF table id is missing"); | |
193125db | 1325 | return -EINVAL; |
53b94835 | 1326 | } |
193125db DA |
1327 | |
1328 | vrf->tb_id = nla_get_u32(data[IFLA_VRF_TABLE]); | |
53b94835 DA |
1329 | if (vrf->tb_id == RT_TABLE_UNSPEC) { |
1330 | NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VRF_TABLE], | |
1331 | "Invalid VRF table id"); | |
24c63bbc | 1332 | return -EINVAL; |
53b94835 | 1333 | } |
193125db | 1334 | |
007979ea | 1335 | dev->priv_flags |= IFF_L3MDEV_MASTER; |
193125db | 1336 | |
1aa6c4f6 DA |
1337 | err = register_netdevice(dev); |
1338 | if (err) | |
1339 | goto out; | |
1340 | ||
097d3c95 DA |
1341 | net = dev_net(dev); |
1342 | add_fib_rules = net_generic(net, vrf_net_id); | |
1343 | if (*add_fib_rules) { | |
1aa6c4f6 DA |
1344 | err = vrf_add_fib_rules(dev); |
1345 | if (err) { | |
1346 | unregister_netdevice(dev); | |
1347 | goto out; | |
1348 | } | |
097d3c95 | 1349 | *add_fib_rules = false; |
1aa6c4f6 DA |
1350 | } |
1351 | ||
1352 | out: | |
1353 | return err; | |
193125db DA |
1354 | } |
1355 | ||
1356 | static size_t vrf_nl_getsize(const struct net_device *dev) | |
1357 | { | |
1358 | return nla_total_size(sizeof(u32)); /* IFLA_VRF_TABLE */ | |
1359 | } | |
1360 | ||
1361 | static int vrf_fillinfo(struct sk_buff *skb, | |
1362 | const struct net_device *dev) | |
1363 | { | |
1364 | struct net_vrf *vrf = netdev_priv(dev); | |
1365 | ||
1366 | return nla_put_u32(skb, IFLA_VRF_TABLE, vrf->tb_id); | |
1367 | } | |
1368 | ||
67eb0331 DA |
1369 | static size_t vrf_get_slave_size(const struct net_device *bond_dev, |
1370 | const struct net_device *slave_dev) | |
1371 | { | |
1372 | return nla_total_size(sizeof(u32)); /* IFLA_VRF_PORT_TABLE */ | |
1373 | } | |
1374 | ||
1375 | static int vrf_fill_slave_info(struct sk_buff *skb, | |
1376 | const struct net_device *vrf_dev, | |
1377 | const struct net_device *slave_dev) | |
1378 | { | |
1379 | struct net_vrf *vrf = netdev_priv(vrf_dev); | |
1380 | ||
1381 | if (nla_put_u32(skb, IFLA_VRF_PORT_TABLE, vrf->tb_id)) | |
1382 | return -EMSGSIZE; | |
1383 | ||
1384 | return 0; | |
1385 | } | |
1386 | ||
193125db DA |
1387 | static const struct nla_policy vrf_nl_policy[IFLA_VRF_MAX + 1] = { |
1388 | [IFLA_VRF_TABLE] = { .type = NLA_U32 }, | |
1389 | }; | |
1390 | ||
1391 | static struct rtnl_link_ops vrf_link_ops __read_mostly = { | |
1392 | .kind = DRV_NAME, | |
1393 | .priv_size = sizeof(struct net_vrf), | |
1394 | ||
1395 | .get_size = vrf_nl_getsize, | |
1396 | .policy = vrf_nl_policy, | |
1397 | .validate = vrf_validate, | |
1398 | .fill_info = vrf_fillinfo, | |
1399 | ||
67eb0331 DA |
1400 | .get_slave_size = vrf_get_slave_size, |
1401 | .fill_slave_info = vrf_fill_slave_info, | |
1402 | ||
193125db DA |
1403 | .newlink = vrf_newlink, |
1404 | .dellink = vrf_dellink, | |
1405 | .setup = vrf_setup, | |
1406 | .maxtype = IFLA_VRF_MAX, | |
1407 | }; | |
1408 | ||
1409 | static int vrf_device_event(struct notifier_block *unused, | |
1410 | unsigned long event, void *ptr) | |
1411 | { | |
1412 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
1413 | ||
1414 | /* only care about unregister events to drop slave references */ | |
1415 | if (event == NETDEV_UNREGISTER) { | |
193125db DA |
1416 | struct net_device *vrf_dev; |
1417 | ||
fee6d4c7 | 1418 | if (!netif_is_l3_slave(dev)) |
193125db DA |
1419 | goto out; |
1420 | ||
58aa9087 NA |
1421 | vrf_dev = netdev_master_upper_dev_get(dev); |
1422 | vrf_del_slave(vrf_dev, dev); | |
193125db DA |
1423 | } |
1424 | out: | |
1425 | return NOTIFY_DONE; | |
1426 | } | |
1427 | ||
1428 | static struct notifier_block vrf_notifier_block __read_mostly = { | |
1429 | .notifier_call = vrf_device_event, | |
1430 | }; | |
1431 | ||
097d3c95 DA |
1432 | /* Initialize per network namespace state */ |
1433 | static int __net_init vrf_netns_init(struct net *net) | |
1434 | { | |
1435 | bool *add_fib_rules = net_generic(net, vrf_net_id); | |
1436 | ||
1437 | *add_fib_rules = true; | |
1438 | ||
1439 | return 0; | |
1440 | } | |
1441 | ||
1442 | static struct pernet_operations vrf_net_ops __net_initdata = { | |
1443 | .init = vrf_netns_init, | |
1444 | .id = &vrf_net_id, | |
1445 | .size = sizeof(bool), | |
1446 | }; | |
1447 | ||
193125db DA |
1448 | static int __init vrf_init_module(void) |
1449 | { | |
1450 | int rc; | |
1451 | ||
193125db DA |
1452 | register_netdevice_notifier(&vrf_notifier_block); |
1453 | ||
097d3c95 | 1454 | rc = register_pernet_subsys(&vrf_net_ops); |
193125db DA |
1455 | if (rc < 0) |
1456 | goto error; | |
1457 | ||
097d3c95 DA |
1458 | rc = rtnl_link_register(&vrf_link_ops); |
1459 | if (rc < 0) { | |
1460 | unregister_pernet_subsys(&vrf_net_ops); | |
1461 | goto error; | |
1462 | } | |
1463 | ||
193125db DA |
1464 | return 0; |
1465 | ||
1466 | error: | |
1467 | unregister_netdevice_notifier(&vrf_notifier_block); | |
193125db DA |
1468 | return rc; |
1469 | } | |
1470 | ||
193125db | 1471 | module_init(vrf_init_module); |
193125db DA |
1472 | MODULE_AUTHOR("Shrijeet Mukherjee, David Ahern"); |
1473 | MODULE_DESCRIPTION("Device driver to instantiate VRF domains"); | |
1474 | MODULE_LICENSE("GPL"); | |
1475 | MODULE_ALIAS_RTNL_LINK(DRV_NAME); | |
1476 | MODULE_VERSION(DRV_VERSION); |