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> |
193125db | 39 | |
8cbb512c DA |
40 | #define RT_FL_TOS(oldflp4) \ |
41 | ((oldflp4)->flowi4_tos & (IPTOS_RT_MASK | RTO_ONLINK)) | |
42 | ||
193125db DA |
43 | #define DRV_NAME "vrf" |
44 | #define DRV_VERSION "1.0" | |
45 | ||
1aa6c4f6 DA |
46 | #define FIB_RULE_PREF 1000 /* default preference for FIB rules */ |
47 | static bool add_fib_rules = true; | |
48 | ||
ec539514 | 49 | struct net_vrf { |
b0e95ccd | 50 | struct rtable __rcu *rth; |
afe80a49 | 51 | struct rtable __rcu *rth_local; |
b0e95ccd | 52 | struct rt6_info __rcu *rt6; |
b4869aa2 | 53 | struct rt6_info __rcu *rt6_local; |
ec539514 DA |
54 | u32 tb_id; |
55 | }; | |
56 | ||
193125db DA |
57 | struct pcpu_dstats { |
58 | u64 tx_pkts; | |
59 | u64 tx_bytes; | |
60 | u64 tx_drps; | |
61 | u64 rx_pkts; | |
62 | u64 rx_bytes; | |
afe80a49 | 63 | u64 rx_drps; |
193125db DA |
64 | struct u64_stats_sync syncp; |
65 | }; | |
66 | ||
afe80a49 DA |
67 | static void vrf_rx_stats(struct net_device *dev, int len) |
68 | { | |
69 | struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats); | |
70 | ||
71 | u64_stats_update_begin(&dstats->syncp); | |
72 | dstats->rx_pkts++; | |
73 | dstats->rx_bytes += len; | |
74 | u64_stats_update_end(&dstats->syncp); | |
75 | } | |
76 | ||
57b8efa1 NA |
77 | static void vrf_tx_error(struct net_device *vrf_dev, struct sk_buff *skb) |
78 | { | |
79 | vrf_dev->stats.tx_errors++; | |
80 | kfree_skb(skb); | |
81 | } | |
82 | ||
193125db DA |
83 | static struct rtnl_link_stats64 *vrf_get_stats64(struct net_device *dev, |
84 | struct rtnl_link_stats64 *stats) | |
85 | { | |
86 | int i; | |
87 | ||
88 | for_each_possible_cpu(i) { | |
89 | const struct pcpu_dstats *dstats; | |
90 | u64 tbytes, tpkts, tdrops, rbytes, rpkts; | |
91 | unsigned int start; | |
92 | ||
93 | dstats = per_cpu_ptr(dev->dstats, i); | |
94 | do { | |
95 | start = u64_stats_fetch_begin_irq(&dstats->syncp); | |
96 | tbytes = dstats->tx_bytes; | |
97 | tpkts = dstats->tx_pkts; | |
98 | tdrops = dstats->tx_drps; | |
99 | rbytes = dstats->rx_bytes; | |
100 | rpkts = dstats->rx_pkts; | |
101 | } while (u64_stats_fetch_retry_irq(&dstats->syncp, start)); | |
102 | stats->tx_bytes += tbytes; | |
103 | stats->tx_packets += tpkts; | |
104 | stats->tx_dropped += tdrops; | |
105 | stats->rx_bytes += rbytes; | |
106 | stats->rx_packets += rpkts; | |
107 | } | |
108 | return stats; | |
109 | } | |
110 | ||
afe80a49 DA |
111 | /* Local traffic destined to local address. Reinsert the packet to rx |
112 | * path, similar to loopback handling. | |
113 | */ | |
114 | static int vrf_local_xmit(struct sk_buff *skb, struct net_device *dev, | |
115 | struct dst_entry *dst) | |
116 | { | |
117 | int len = skb->len; | |
118 | ||
119 | skb_orphan(skb); | |
120 | ||
121 | skb_dst_set(skb, dst); | |
122 | skb_dst_force(skb); | |
123 | ||
124 | /* set pkt_type to avoid skb hitting packet taps twice - | |
125 | * once on Tx and again in Rx processing | |
126 | */ | |
127 | skb->pkt_type = PACKET_LOOPBACK; | |
128 | ||
129 | skb->protocol = eth_type_trans(skb, dev); | |
130 | ||
131 | if (likely(netif_rx(skb) == NET_RX_SUCCESS)) | |
132 | vrf_rx_stats(dev, len); | |
133 | else | |
134 | this_cpu_inc(dev->dstats->rx_drps); | |
135 | ||
136 | return NETDEV_TX_OK; | |
137 | } | |
138 | ||
35402e31 DA |
139 | #if IS_ENABLED(CONFIG_IPV6) |
140 | static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb, | |
141 | struct net_device *dev) | |
142 | { | |
143 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
144 | struct net *net = dev_net(skb->dev); | |
145 | struct flowi6 fl6 = { | |
146 | /* needed to match OIF rule */ | |
147 | .flowi6_oif = dev->ifindex, | |
148 | .flowi6_iif = LOOPBACK_IFINDEX, | |
149 | .daddr = iph->daddr, | |
150 | .saddr = iph->saddr, | |
151 | .flowlabel = ip6_flowinfo(iph), | |
152 | .flowi6_mark = skb->mark, | |
153 | .flowi6_proto = iph->nexthdr, | |
154 | .flowi6_flags = FLOWI_FLAG_L3MDEV_SRC | FLOWI_FLAG_SKIP_NH_OIF, | |
155 | }; | |
156 | int ret = NET_XMIT_DROP; | |
157 | struct dst_entry *dst; | |
158 | struct dst_entry *dst_null = &net->ipv6.ip6_null_entry->dst; | |
159 | ||
160 | dst = ip6_route_output(net, NULL, &fl6); | |
161 | if (dst == dst_null) | |
162 | goto err; | |
163 | ||
164 | skb_dst_drop(skb); | |
b4869aa2 DA |
165 | |
166 | /* if dst.dev is loopback or the VRF device again this is locally | |
167 | * originated traffic destined to a local address. Short circuit | |
168 | * to Rx path using our local dst | |
169 | */ | |
170 | if (dst->dev == net->loopback_dev || dst->dev == dev) { | |
171 | struct net_vrf *vrf = netdev_priv(dev); | |
172 | struct rt6_info *rt6_local; | |
173 | ||
174 | /* release looked up dst and use cached local dst */ | |
175 | dst_release(dst); | |
176 | ||
177 | rcu_read_lock(); | |
178 | ||
179 | rt6_local = rcu_dereference(vrf->rt6_local); | |
180 | if (unlikely(!rt6_local)) { | |
181 | rcu_read_unlock(); | |
182 | goto err; | |
183 | } | |
184 | ||
185 | /* Ordering issue: cached local dst is created on newlink | |
186 | * before the IPv6 initialization. Using the local dst | |
187 | * requires rt6i_idev to be set so make sure it is. | |
188 | */ | |
189 | if (unlikely(!rt6_local->rt6i_idev)) { | |
190 | rt6_local->rt6i_idev = in6_dev_get(dev); | |
191 | if (!rt6_local->rt6i_idev) { | |
192 | rcu_read_unlock(); | |
193 | goto err; | |
194 | } | |
195 | } | |
196 | ||
197 | dst = &rt6_local->dst; | |
198 | dst_hold(dst); | |
199 | ||
200 | rcu_read_unlock(); | |
201 | ||
202 | return vrf_local_xmit(skb, dev, &rt6_local->dst); | |
203 | } | |
204 | ||
35402e31 DA |
205 | skb_dst_set(skb, dst); |
206 | ||
911a66fb DA |
207 | /* strip the ethernet header added for pass through VRF device */ |
208 | __skb_pull(skb, skb_network_offset(skb)); | |
209 | ||
35402e31 DA |
210 | ret = ip6_local_out(net, skb->sk, skb); |
211 | if (unlikely(net_xmit_eval(ret))) | |
212 | dev->stats.tx_errors++; | |
213 | else | |
214 | ret = NET_XMIT_SUCCESS; | |
215 | ||
216 | return ret; | |
217 | err: | |
218 | vrf_tx_error(dev, skb); | |
219 | return NET_XMIT_DROP; | |
220 | } | |
221 | #else | |
193125db DA |
222 | static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb, |
223 | struct net_device *dev) | |
224 | { | |
57b8efa1 NA |
225 | vrf_tx_error(dev, skb); |
226 | return NET_XMIT_DROP; | |
193125db | 227 | } |
35402e31 | 228 | #endif |
193125db | 229 | |
193125db DA |
230 | static netdev_tx_t vrf_process_v4_outbound(struct sk_buff *skb, |
231 | struct net_device *vrf_dev) | |
232 | { | |
233 | struct iphdr *ip4h = ip_hdr(skb); | |
234 | int ret = NET_XMIT_DROP; | |
235 | struct flowi4 fl4 = { | |
236 | /* needed to match OIF rule */ | |
237 | .flowi4_oif = vrf_dev->ifindex, | |
238 | .flowi4_iif = LOOPBACK_IFINDEX, | |
239 | .flowi4_tos = RT_TOS(ip4h->tos), | |
6e2895a8 | 240 | .flowi4_flags = FLOWI_FLAG_ANYSRC | FLOWI_FLAG_L3MDEV_SRC | |
58189ca7 | 241 | FLOWI_FLAG_SKIP_NH_OIF, |
193125db DA |
242 | .daddr = ip4h->daddr, |
243 | }; | |
911a66fb DA |
244 | struct net *net = dev_net(vrf_dev); |
245 | struct rtable *rt; | |
246 | ||
247 | rt = ip_route_output_flow(net, &fl4, NULL); | |
248 | if (IS_ERR(rt)) | |
249 | goto err; | |
193125db | 250 | |
911a66fb DA |
251 | if (rt->rt_type != RTN_UNICAST && rt->rt_type != RTN_LOCAL) { |
252 | ip_rt_put(rt); | |
193125db | 253 | goto err; |
911a66fb DA |
254 | } |
255 | ||
256 | skb_dst_drop(skb); | |
afe80a49 DA |
257 | |
258 | /* if dst.dev is loopback or the VRF device again this is locally | |
259 | * originated traffic destined to a local address. Short circuit | |
260 | * to Rx path using our local dst | |
261 | */ | |
262 | if (rt->dst.dev == net->loopback_dev || rt->dst.dev == vrf_dev) { | |
263 | struct net_vrf *vrf = netdev_priv(vrf_dev); | |
264 | struct rtable *rth_local; | |
265 | struct dst_entry *dst = NULL; | |
266 | ||
267 | ip_rt_put(rt); | |
268 | ||
269 | rcu_read_lock(); | |
270 | ||
271 | rth_local = rcu_dereference(vrf->rth_local); | |
272 | if (likely(rth_local)) { | |
273 | dst = &rth_local->dst; | |
274 | dst_hold(dst); | |
275 | } | |
276 | ||
277 | rcu_read_unlock(); | |
278 | ||
279 | if (unlikely(!dst)) | |
280 | goto err; | |
281 | ||
282 | return vrf_local_xmit(skb, vrf_dev, dst); | |
283 | } | |
284 | ||
911a66fb DA |
285 | skb_dst_set(skb, &rt->dst); |
286 | ||
287 | /* strip the ethernet header added for pass through VRF device */ | |
288 | __skb_pull(skb, skb_network_offset(skb)); | |
193125db DA |
289 | |
290 | if (!ip4h->saddr) { | |
291 | ip4h->saddr = inet_select_addr(skb_dst(skb)->dev, 0, | |
292 | RT_SCOPE_LINK); | |
293 | } | |
294 | ||
33224b16 | 295 | ret = ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb); |
193125db DA |
296 | if (unlikely(net_xmit_eval(ret))) |
297 | vrf_dev->stats.tx_errors++; | |
298 | else | |
299 | ret = NET_XMIT_SUCCESS; | |
300 | ||
301 | out: | |
302 | return ret; | |
303 | err: | |
57b8efa1 | 304 | vrf_tx_error(vrf_dev, skb); |
193125db DA |
305 | goto out; |
306 | } | |
307 | ||
308 | static netdev_tx_t is_ip_tx_frame(struct sk_buff *skb, struct net_device *dev) | |
309 | { | |
310 | switch (skb->protocol) { | |
311 | case htons(ETH_P_IP): | |
312 | return vrf_process_v4_outbound(skb, dev); | |
313 | case htons(ETH_P_IPV6): | |
314 | return vrf_process_v6_outbound(skb, dev); | |
315 | default: | |
57b8efa1 | 316 | vrf_tx_error(dev, skb); |
193125db DA |
317 | return NET_XMIT_DROP; |
318 | } | |
319 | } | |
320 | ||
321 | static netdev_tx_t vrf_xmit(struct sk_buff *skb, struct net_device *dev) | |
322 | { | |
323 | netdev_tx_t ret = is_ip_tx_frame(skb, dev); | |
324 | ||
325 | if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { | |
326 | struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats); | |
327 | ||
328 | u64_stats_update_begin(&dstats->syncp); | |
329 | dstats->tx_pkts++; | |
330 | dstats->tx_bytes += skb->len; | |
331 | u64_stats_update_end(&dstats->syncp); | |
332 | } else { | |
333 | this_cpu_inc(dev->dstats->tx_drps); | |
334 | } | |
335 | ||
336 | return ret; | |
337 | } | |
338 | ||
35402e31 | 339 | #if IS_ENABLED(CONFIG_IPV6) |
35402e31 DA |
340 | /* modelled after ip6_finish_output2 */ |
341 | static int vrf_finish_output6(struct net *net, struct sock *sk, | |
342 | struct sk_buff *skb) | |
343 | { | |
344 | struct dst_entry *dst = skb_dst(skb); | |
345 | struct net_device *dev = dst->dev; | |
346 | struct neighbour *neigh; | |
347 | struct in6_addr *nexthop; | |
348 | int ret; | |
349 | ||
350 | skb->protocol = htons(ETH_P_IPV6); | |
351 | skb->dev = dev; | |
352 | ||
353 | rcu_read_lock_bh(); | |
354 | nexthop = rt6_nexthop((struct rt6_info *)dst, &ipv6_hdr(skb)->daddr); | |
355 | neigh = __ipv6_neigh_lookup_noref(dst->dev, nexthop); | |
356 | if (unlikely(!neigh)) | |
357 | neigh = __neigh_create(&nd_tbl, nexthop, dst->dev, false); | |
358 | if (!IS_ERR(neigh)) { | |
359 | ret = dst_neigh_output(dst, neigh, skb); | |
360 | rcu_read_unlock_bh(); | |
361 | return ret; | |
362 | } | |
363 | rcu_read_unlock_bh(); | |
364 | ||
365 | IP6_INC_STATS(dev_net(dst->dev), | |
366 | ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES); | |
367 | kfree_skb(skb); | |
368 | return -EINVAL; | |
369 | } | |
370 | ||
371 | /* modelled after ip6_output */ | |
372 | static int vrf_output6(struct net *net, struct sock *sk, struct sk_buff *skb) | |
373 | { | |
374 | return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING, | |
375 | net, sk, skb, NULL, skb_dst(skb)->dev, | |
376 | vrf_finish_output6, | |
377 | !(IP6CB(skb)->flags & IP6SKB_REROUTED)); | |
378 | } | |
379 | ||
b0e95ccd | 380 | /* holding rtnl */ |
810e530b | 381 | static void vrf_rt6_release(struct net_device *dev, struct net_vrf *vrf) |
35402e31 | 382 | { |
b0e95ccd | 383 | struct rt6_info *rt6 = rtnl_dereference(vrf->rt6); |
b4869aa2 | 384 | struct rt6_info *rt6_local = rtnl_dereference(vrf->rt6_local); |
810e530b DA |
385 | struct net *net = dev_net(dev); |
386 | struct dst_entry *dst; | |
b0e95ccd | 387 | |
b4869aa2 DA |
388 | RCU_INIT_POINTER(vrf->rt6, NULL); |
389 | RCU_INIT_POINTER(vrf->rt6_local, NULL); | |
390 | synchronize_rcu(); | |
b0e95ccd | 391 | |
810e530b DA |
392 | /* move dev in dst's to loopback so this VRF device can be deleted |
393 | * - based on dst_ifdown | |
394 | */ | |
395 | if (rt6) { | |
396 | dst = &rt6->dst; | |
397 | dev_put(dst->dev); | |
398 | dst->dev = net->loopback_dev; | |
399 | dev_hold(dst->dev); | |
400 | dst_release(dst); | |
401 | } | |
b4869aa2 DA |
402 | |
403 | if (rt6_local) { | |
404 | if (rt6_local->rt6i_idev) | |
405 | in6_dev_put(rt6_local->rt6i_idev); | |
406 | ||
810e530b DA |
407 | dst = &rt6_local->dst; |
408 | dev_put(dst->dev); | |
409 | dst->dev = net->loopback_dev; | |
410 | dev_hold(dst->dev); | |
411 | dst_release(dst); | |
b4869aa2 | 412 | } |
35402e31 DA |
413 | } |
414 | ||
415 | static int vrf_rt6_create(struct net_device *dev) | |
416 | { | |
b4869aa2 | 417 | int flags = DST_HOST | DST_NOPOLICY | DST_NOXFRM | DST_NOCACHE; |
35402e31 | 418 | struct net_vrf *vrf = netdev_priv(dev); |
9ab179d8 | 419 | struct net *net = dev_net(dev); |
b3b4663c | 420 | struct fib6_table *rt6i_table; |
b4869aa2 | 421 | struct rt6_info *rt6, *rt6_local; |
35402e31 DA |
422 | int rc = -ENOMEM; |
423 | ||
e4348637 DA |
424 | /* IPv6 can be CONFIG enabled and then disabled runtime */ |
425 | if (!ipv6_mod_enabled()) | |
426 | return 0; | |
427 | ||
b3b4663c DA |
428 | rt6i_table = fib6_new_table(net, vrf->tb_id); |
429 | if (!rt6i_table) | |
430 | goto out; | |
431 | ||
b4869aa2 DA |
432 | /* create a dst for routing packets out a VRF device */ |
433 | rt6 = ip6_dst_alloc(net, dev, flags); | |
35402e31 DA |
434 | if (!rt6) |
435 | goto out; | |
436 | ||
9ab179d8 | 437 | dst_hold(&rt6->dst); |
b3b4663c DA |
438 | |
439 | rt6->rt6i_table = rt6i_table; | |
440 | rt6->dst.output = vrf_output6; | |
b4869aa2 DA |
441 | |
442 | /* create a dst for local routing - packets sent locally | |
443 | * to local address via the VRF device as a loopback | |
444 | */ | |
445 | rt6_local = ip6_dst_alloc(net, dev, flags); | |
446 | if (!rt6_local) { | |
447 | dst_release(&rt6->dst); | |
448 | goto out; | |
449 | } | |
450 | ||
451 | dst_hold(&rt6_local->dst); | |
452 | ||
453 | rt6_local->rt6i_idev = in6_dev_get(dev); | |
454 | rt6_local->rt6i_flags = RTF_UP | RTF_NONEXTHOP | RTF_LOCAL; | |
455 | rt6_local->rt6i_table = rt6i_table; | |
456 | rt6_local->dst.input = ip6_input; | |
457 | ||
b0e95ccd | 458 | rcu_assign_pointer(vrf->rt6, rt6); |
b4869aa2 | 459 | rcu_assign_pointer(vrf->rt6_local, rt6_local); |
b0e95ccd | 460 | |
35402e31 DA |
461 | rc = 0; |
462 | out: | |
463 | return rc; | |
464 | } | |
465 | #else | |
810e530b | 466 | static void vrf_rt6_release(struct net_device *dev, struct net_vrf *vrf) |
35402e31 DA |
467 | { |
468 | } | |
469 | ||
470 | static int vrf_rt6_create(struct net_device *dev) | |
471 | { | |
472 | return 0; | |
473 | } | |
474 | #endif | |
475 | ||
8f58336d | 476 | /* modelled after ip_finish_output2 */ |
0c4b51f0 | 477 | static int vrf_finish_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
193125db | 478 | { |
8f58336d DA |
479 | struct dst_entry *dst = skb_dst(skb); |
480 | struct rtable *rt = (struct rtable *)dst; | |
481 | struct net_device *dev = dst->dev; | |
482 | unsigned int hh_len = LL_RESERVED_SPACE(dev); | |
483 | struct neighbour *neigh; | |
484 | u32 nexthop; | |
485 | int ret = -EINVAL; | |
486 | ||
487 | /* Be paranoid, rather than too clever. */ | |
488 | if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) { | |
489 | struct sk_buff *skb2; | |
490 | ||
491 | skb2 = skb_realloc_headroom(skb, LL_RESERVED_SPACE(dev)); | |
492 | if (!skb2) { | |
493 | ret = -ENOMEM; | |
494 | goto err; | |
495 | } | |
496 | if (skb->sk) | |
497 | skb_set_owner_w(skb2, skb->sk); | |
498 | ||
499 | consume_skb(skb); | |
500 | skb = skb2; | |
501 | } | |
502 | ||
503 | rcu_read_lock_bh(); | |
504 | ||
505 | nexthop = (__force u32)rt_nexthop(rt, ip_hdr(skb)->daddr); | |
506 | neigh = __ipv4_neigh_lookup_noref(dev, nexthop); | |
507 | if (unlikely(!neigh)) | |
508 | neigh = __neigh_create(&arp_tbl, &nexthop, dev, false); | |
509 | if (!IS_ERR(neigh)) | |
510 | ret = dst_neigh_output(dst, neigh, skb); | |
511 | ||
512 | rcu_read_unlock_bh(); | |
513 | err: | |
514 | if (unlikely(ret < 0)) | |
515 | vrf_tx_error(skb->dev, skb); | |
516 | return ret; | |
193125db DA |
517 | } |
518 | ||
ede2059d | 519 | static int vrf_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
193125db DA |
520 | { |
521 | struct net_device *dev = skb_dst(skb)->dev; | |
522 | ||
29a26a56 | 523 | IP_UPD_PO_STATS(net, IPSTATS_MIB_OUT, skb->len); |
193125db DA |
524 | |
525 | skb->dev = dev; | |
526 | skb->protocol = htons(ETH_P_IP); | |
527 | ||
29a26a56 EB |
528 | return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING, |
529 | net, sk, skb, NULL, dev, | |
8f58336d | 530 | vrf_finish_output, |
193125db DA |
531 | !(IPCB(skb)->flags & IPSKB_REROUTED)); |
532 | } | |
533 | ||
b0e95ccd | 534 | /* holding rtnl */ |
810e530b | 535 | static void vrf_rtable_release(struct net_device *dev, struct net_vrf *vrf) |
193125db | 536 | { |
b0e95ccd | 537 | struct rtable *rth = rtnl_dereference(vrf->rth); |
afe80a49 | 538 | struct rtable *rth_local = rtnl_dereference(vrf->rth_local); |
810e530b DA |
539 | struct net *net = dev_net(dev); |
540 | struct dst_entry *dst; | |
b0e95ccd | 541 | |
afe80a49 DA |
542 | RCU_INIT_POINTER(vrf->rth, NULL); |
543 | RCU_INIT_POINTER(vrf->rth_local, NULL); | |
544 | synchronize_rcu(); | |
193125db | 545 | |
810e530b DA |
546 | /* move dev in dst's to loopback so this VRF device can be deleted |
547 | * - based on dst_ifdown | |
548 | */ | |
549 | if (rth) { | |
550 | dst = &rth->dst; | |
551 | dev_put(dst->dev); | |
552 | dst->dev = net->loopback_dev; | |
553 | dev_hold(dst->dev); | |
554 | dst_release(dst); | |
555 | } | |
afe80a49 | 556 | |
810e530b DA |
557 | if (rth_local) { |
558 | dst = &rth_local->dst; | |
559 | dev_put(dst->dev); | |
560 | dst->dev = net->loopback_dev; | |
561 | dev_hold(dst->dev); | |
562 | dst_release(dst); | |
563 | } | |
193125db DA |
564 | } |
565 | ||
b0e95ccd | 566 | static int vrf_rtable_create(struct net_device *dev) |
193125db | 567 | { |
b7503e0c | 568 | struct net_vrf *vrf = netdev_priv(dev); |
afe80a49 | 569 | struct rtable *rth, *rth_local; |
193125db | 570 | |
b3b4663c | 571 | if (!fib_new_table(dev_net(dev), vrf->tb_id)) |
b0e95ccd | 572 | return -ENOMEM; |
b3b4663c | 573 | |
afe80a49 | 574 | /* create a dst for routing packets out through a VRF device */ |
9ab179d8 | 575 | rth = rt_dst_alloc(dev, 0, RTN_UNICAST, 1, 1, 0); |
b0e95ccd DA |
576 | if (!rth) |
577 | return -ENOMEM; | |
193125db | 578 | |
afe80a49 DA |
579 | /* create a dst for local ingress routing - packets sent locally |
580 | * to local address via the VRF device as a loopback | |
581 | */ | |
582 | rth_local = rt_dst_alloc(dev, RTCF_LOCAL, RTN_LOCAL, 1, 1, 0); | |
583 | if (!rth_local) { | |
584 | dst_release(&rth->dst); | |
585 | return -ENOMEM; | |
586 | } | |
587 | ||
b0e95ccd DA |
588 | rth->dst.output = vrf_output; |
589 | rth->rt_table_id = vrf->tb_id; | |
590 | ||
afe80a49 DA |
591 | rth_local->rt_table_id = vrf->tb_id; |
592 | ||
b0e95ccd | 593 | rcu_assign_pointer(vrf->rth, rth); |
afe80a49 | 594 | rcu_assign_pointer(vrf->rth_local, rth_local); |
b0e95ccd DA |
595 | |
596 | return 0; | |
193125db DA |
597 | } |
598 | ||
599 | /**************************** device handling ********************/ | |
600 | ||
601 | /* cycle interface to flush neighbor cache and move routes across tables */ | |
602 | static void cycle_netdev(struct net_device *dev) | |
603 | { | |
604 | unsigned int flags = dev->flags; | |
605 | int ret; | |
606 | ||
607 | if (!netif_running(dev)) | |
608 | return; | |
609 | ||
610 | ret = dev_change_flags(dev, flags & ~IFF_UP); | |
611 | if (ret >= 0) | |
612 | ret = dev_change_flags(dev, flags); | |
613 | ||
614 | if (ret < 0) { | |
615 | netdev_err(dev, | |
616 | "Failed to cycle device %s; route tables might be wrong!\n", | |
617 | dev->name); | |
618 | } | |
619 | } | |
620 | ||
193125db DA |
621 | static int do_vrf_add_slave(struct net_device *dev, struct net_device *port_dev) |
622 | { | |
bad53162 | 623 | int ret; |
193125db | 624 | |
29bf24af | 625 | ret = netdev_master_upper_dev_link(port_dev, dev, NULL, NULL); |
193125db | 626 | if (ret < 0) |
74b20582 | 627 | return ret; |
193125db | 628 | |
fee6d4c7 | 629 | port_dev->priv_flags |= IFF_L3MDEV_SLAVE; |
193125db DA |
630 | cycle_netdev(port_dev); |
631 | ||
632 | return 0; | |
193125db DA |
633 | } |
634 | ||
635 | static int vrf_add_slave(struct net_device *dev, struct net_device *port_dev) | |
636 | { | |
fee6d4c7 | 637 | if (netif_is_l3_master(port_dev) || netif_is_l3_slave(port_dev)) |
193125db DA |
638 | return -EINVAL; |
639 | ||
640 | return do_vrf_add_slave(dev, port_dev); | |
641 | } | |
642 | ||
643 | /* inverse of do_vrf_add_slave */ | |
644 | static int do_vrf_del_slave(struct net_device *dev, struct net_device *port_dev) | |
645 | { | |
193125db | 646 | netdev_upper_dev_unlink(port_dev, dev); |
fee6d4c7 | 647 | port_dev->priv_flags &= ~IFF_L3MDEV_SLAVE; |
193125db | 648 | |
193125db DA |
649 | cycle_netdev(port_dev); |
650 | ||
193125db DA |
651 | return 0; |
652 | } | |
653 | ||
654 | static int vrf_del_slave(struct net_device *dev, struct net_device *port_dev) | |
655 | { | |
193125db DA |
656 | return do_vrf_del_slave(dev, port_dev); |
657 | } | |
658 | ||
659 | static void vrf_dev_uninit(struct net_device *dev) | |
660 | { | |
661 | struct net_vrf *vrf = netdev_priv(dev); | |
bad53162 NA |
662 | struct net_device *port_dev; |
663 | struct list_head *iter; | |
193125db | 664 | |
810e530b DA |
665 | vrf_rtable_release(dev, vrf); |
666 | vrf_rt6_release(dev, vrf); | |
193125db | 667 | |
bad53162 NA |
668 | netdev_for_each_lower_dev(dev, port_dev, iter) |
669 | vrf_del_slave(dev, port_dev); | |
193125db | 670 | |
3a4a27d3 | 671 | free_percpu(dev->dstats); |
193125db DA |
672 | dev->dstats = NULL; |
673 | } | |
674 | ||
675 | static int vrf_dev_init(struct net_device *dev) | |
676 | { | |
677 | struct net_vrf *vrf = netdev_priv(dev); | |
678 | ||
193125db DA |
679 | dev->dstats = netdev_alloc_pcpu_stats(struct pcpu_dstats); |
680 | if (!dev->dstats) | |
681 | goto out_nomem; | |
682 | ||
683 | /* create the default dst which points back to us */ | |
b0e95ccd | 684 | if (vrf_rtable_create(dev) != 0) |
193125db DA |
685 | goto out_stats; |
686 | ||
35402e31 DA |
687 | if (vrf_rt6_create(dev) != 0) |
688 | goto out_rth; | |
689 | ||
193125db DA |
690 | dev->flags = IFF_MASTER | IFF_NOARP; |
691 | ||
b87ab6b8 DA |
692 | /* MTU is irrelevant for VRF device; set to 64k similar to lo */ |
693 | dev->mtu = 64 * 1024; | |
694 | ||
695 | /* similarly, oper state is irrelevant; set to up to avoid confusion */ | |
696 | dev->operstate = IF_OPER_UP; | |
78e7a2ae | 697 | netdev_lockdep_set_classes(dev); |
193125db DA |
698 | return 0; |
699 | ||
35402e31 | 700 | out_rth: |
810e530b | 701 | vrf_rtable_release(dev, vrf); |
193125db DA |
702 | out_stats: |
703 | free_percpu(dev->dstats); | |
704 | dev->dstats = NULL; | |
705 | out_nomem: | |
706 | return -ENOMEM; | |
707 | } | |
708 | ||
709 | static const struct net_device_ops vrf_netdev_ops = { | |
710 | .ndo_init = vrf_dev_init, | |
711 | .ndo_uninit = vrf_dev_uninit, | |
712 | .ndo_start_xmit = vrf_xmit, | |
713 | .ndo_get_stats64 = vrf_get_stats64, | |
714 | .ndo_add_slave = vrf_add_slave, | |
715 | .ndo_del_slave = vrf_del_slave, | |
716 | }; | |
717 | ||
ee15ee5d DA |
718 | static u32 vrf_fib_table(const struct net_device *dev) |
719 | { | |
720 | struct net_vrf *vrf = netdev_priv(dev); | |
721 | ||
722 | return vrf->tb_id; | |
723 | } | |
724 | ||
725 | static struct rtable *vrf_get_rtable(const struct net_device *dev, | |
726 | const struct flowi4 *fl4) | |
727 | { | |
728 | struct rtable *rth = NULL; | |
729 | ||
6e2895a8 | 730 | if (!(fl4->flowi4_flags & FLOWI_FLAG_L3MDEV_SRC)) { |
ee15ee5d DA |
731 | struct net_vrf *vrf = netdev_priv(dev); |
732 | ||
b0e95ccd DA |
733 | rcu_read_lock(); |
734 | ||
735 | rth = rcu_dereference(vrf->rth); | |
736 | if (likely(rth)) | |
737 | dst_hold(&rth->dst); | |
738 | ||
739 | rcu_read_unlock(); | |
ee15ee5d DA |
740 | } |
741 | ||
742 | return rth; | |
743 | } | |
744 | ||
8cbb512c | 745 | /* called under rcu_read_lock */ |
b5bdacf3 | 746 | static int vrf_get_saddr(struct net_device *dev, struct flowi4 *fl4) |
8cbb512c DA |
747 | { |
748 | struct fib_result res = { .tclassid = 0 }; | |
749 | struct net *net = dev_net(dev); | |
750 | u32 orig_tos = fl4->flowi4_tos; | |
751 | u8 flags = fl4->flowi4_flags; | |
752 | u8 scope = fl4->flowi4_scope; | |
753 | u8 tos = RT_FL_TOS(fl4); | |
b5bdacf3 | 754 | int rc; |
8cbb512c DA |
755 | |
756 | if (unlikely(!fl4->daddr)) | |
b5bdacf3 | 757 | return 0; |
8cbb512c DA |
758 | |
759 | fl4->flowi4_flags |= FLOWI_FLAG_SKIP_NH_OIF; | |
760 | fl4->flowi4_iif = LOOPBACK_IFINDEX; | |
1ff23bee DA |
761 | /* make sure oif is set to VRF device for lookup */ |
762 | fl4->flowi4_oif = dev->ifindex; | |
8cbb512c DA |
763 | fl4->flowi4_tos = tos & IPTOS_RT_MASK; |
764 | fl4->flowi4_scope = ((tos & RTO_ONLINK) ? | |
765 | RT_SCOPE_LINK : RT_SCOPE_UNIVERSE); | |
766 | ||
b5bdacf3 DA |
767 | rc = fib_lookup(net, fl4, &res, 0); |
768 | if (!rc) { | |
8cbb512c DA |
769 | if (res.type == RTN_LOCAL) |
770 | fl4->saddr = res.fi->fib_prefsrc ? : fl4->daddr; | |
771 | else | |
772 | fib_select_path(net, &res, fl4, -1); | |
773 | } | |
774 | ||
775 | fl4->flowi4_flags = flags; | |
776 | fl4->flowi4_tos = orig_tos; | |
777 | fl4->flowi4_scope = scope; | |
b5bdacf3 DA |
778 | |
779 | return rc; | |
8cbb512c DA |
780 | } |
781 | ||
73e20b76 DA |
782 | static int vrf_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb) |
783 | { | |
784 | return 0; | |
785 | } | |
786 | ||
787 | static struct sk_buff *vrf_rcv_nfhook(u8 pf, unsigned int hook, | |
788 | struct sk_buff *skb, | |
789 | struct net_device *dev) | |
790 | { | |
791 | struct net *net = dev_net(dev); | |
792 | ||
793 | nf_reset(skb); | |
794 | ||
795 | if (NF_HOOK(pf, hook, net, NULL, skb, dev, NULL, vrf_rcv_finish) < 0) | |
796 | skb = NULL; /* kfree_skb(skb) handled by nf code */ | |
797 | ||
798 | return skb; | |
799 | } | |
800 | ||
74b20582 DA |
801 | #if IS_ENABLED(CONFIG_IPV6) |
802 | /* neighbor handling is done with actual device; do not want | |
803 | * to flip skb->dev for those ndisc packets. This really fails | |
804 | * for multiple next protocols (e.g., NEXTHDR_HOP). But it is | |
805 | * a start. | |
806 | */ | |
807 | static bool ipv6_ndisc_frame(const struct sk_buff *skb) | |
808 | { | |
809 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
810 | bool rc = false; | |
811 | ||
812 | if (iph->nexthdr == NEXTHDR_ICMP) { | |
813 | const struct icmp6hdr *icmph; | |
814 | struct icmp6hdr _icmph; | |
815 | ||
816 | icmph = skb_header_pointer(skb, sizeof(*iph), | |
817 | sizeof(_icmph), &_icmph); | |
818 | if (!icmph) | |
819 | goto out; | |
820 | ||
821 | switch (icmph->icmp6_type) { | |
822 | case NDISC_ROUTER_SOLICITATION: | |
823 | case NDISC_ROUTER_ADVERTISEMENT: | |
824 | case NDISC_NEIGHBOUR_SOLICITATION: | |
825 | case NDISC_NEIGHBOUR_ADVERTISEMENT: | |
826 | case NDISC_REDIRECT: | |
827 | rc = true; | |
828 | break; | |
829 | } | |
830 | } | |
831 | ||
832 | out: | |
833 | return rc; | |
834 | } | |
835 | ||
9ff74384 DA |
836 | static struct rt6_info *vrf_ip6_route_lookup(struct net *net, |
837 | const struct net_device *dev, | |
838 | struct flowi6 *fl6, | |
839 | int ifindex, | |
840 | int flags) | |
841 | { | |
842 | struct net_vrf *vrf = netdev_priv(dev); | |
843 | struct fib6_table *table = NULL; | |
844 | struct rt6_info *rt6; | |
845 | ||
846 | rcu_read_lock(); | |
847 | ||
848 | /* fib6_table does not have a refcnt and can not be freed */ | |
849 | rt6 = rcu_dereference(vrf->rt6); | |
850 | if (likely(rt6)) | |
851 | table = rt6->rt6i_table; | |
852 | ||
853 | rcu_read_unlock(); | |
854 | ||
855 | if (!table) | |
856 | return NULL; | |
857 | ||
858 | return ip6_pol_route(net, table, ifindex, fl6, flags); | |
859 | } | |
860 | ||
861 | static void vrf_ip6_input_dst(struct sk_buff *skb, struct net_device *vrf_dev, | |
862 | int ifindex) | |
863 | { | |
864 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
865 | struct flowi6 fl6 = { | |
866 | .daddr = iph->daddr, | |
867 | .saddr = iph->saddr, | |
868 | .flowlabel = ip6_flowinfo(iph), | |
869 | .flowi6_mark = skb->mark, | |
870 | .flowi6_proto = iph->nexthdr, | |
871 | .flowi6_iif = ifindex, | |
872 | }; | |
873 | struct net *net = dev_net(vrf_dev); | |
874 | struct rt6_info *rt6; | |
875 | ||
876 | rt6 = vrf_ip6_route_lookup(net, vrf_dev, &fl6, ifindex, | |
877 | RT6_LOOKUP_F_HAS_SADDR | RT6_LOOKUP_F_IFACE); | |
878 | if (unlikely(!rt6)) | |
879 | return; | |
880 | ||
881 | if (unlikely(&rt6->dst == &net->ipv6.ip6_null_entry->dst)) | |
882 | return; | |
883 | ||
884 | skb_dst_set(skb, &rt6->dst); | |
885 | } | |
886 | ||
74b20582 DA |
887 | static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev, |
888 | struct sk_buff *skb) | |
889 | { | |
9ff74384 DA |
890 | int orig_iif = skb->skb_iif; |
891 | bool need_strict; | |
892 | ||
b4869aa2 DA |
893 | /* loopback traffic; do not push through packet taps again. |
894 | * Reset pkt_type for upper layers to process skb | |
895 | */ | |
896 | if (skb->pkt_type == PACKET_LOOPBACK) { | |
897 | skb->dev = vrf_dev; | |
898 | skb->skb_iif = vrf_dev->ifindex; | |
899 | skb->pkt_type = PACKET_HOST; | |
900 | goto out; | |
901 | } | |
902 | ||
9ff74384 DA |
903 | /* if packet is NDISC or addressed to multicast or link-local |
904 | * then keep the ingress interface | |
905 | */ | |
906 | need_strict = rt6_need_strict(&ipv6_hdr(skb)->daddr); | |
907 | if (!ipv6_ndisc_frame(skb) && !need_strict) { | |
74b20582 DA |
908 | skb->dev = vrf_dev; |
909 | skb->skb_iif = vrf_dev->ifindex; | |
910 | ||
911 | skb_push(skb, skb->mac_len); | |
912 | dev_queue_xmit_nit(skb, vrf_dev); | |
913 | skb_pull(skb, skb->mac_len); | |
914 | ||
915 | IP6CB(skb)->flags |= IP6SKB_L3SLAVE; | |
916 | } | |
917 | ||
9ff74384 DA |
918 | if (need_strict) |
919 | vrf_ip6_input_dst(skb, vrf_dev, orig_iif); | |
920 | ||
73e20b76 | 921 | skb = vrf_rcv_nfhook(NFPROTO_IPV6, NF_INET_PRE_ROUTING, skb, vrf_dev); |
b4869aa2 | 922 | out: |
74b20582 DA |
923 | return skb; |
924 | } | |
925 | ||
926 | #else | |
927 | static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev, | |
928 | struct sk_buff *skb) | |
929 | { | |
930 | return skb; | |
931 | } | |
932 | #endif | |
933 | ||
934 | static struct sk_buff *vrf_ip_rcv(struct net_device *vrf_dev, | |
935 | struct sk_buff *skb) | |
936 | { | |
937 | skb->dev = vrf_dev; | |
938 | skb->skb_iif = vrf_dev->ifindex; | |
939 | ||
afe80a49 DA |
940 | /* loopback traffic; do not push through packet taps again. |
941 | * Reset pkt_type for upper layers to process skb | |
942 | */ | |
943 | if (skb->pkt_type == PACKET_LOOPBACK) { | |
944 | skb->pkt_type = PACKET_HOST; | |
945 | goto out; | |
946 | } | |
947 | ||
74b20582 DA |
948 | skb_push(skb, skb->mac_len); |
949 | dev_queue_xmit_nit(skb, vrf_dev); | |
950 | skb_pull(skb, skb->mac_len); | |
951 | ||
73e20b76 | 952 | skb = vrf_rcv_nfhook(NFPROTO_IPV4, NF_INET_PRE_ROUTING, skb, vrf_dev); |
afe80a49 | 953 | out: |
74b20582 DA |
954 | return skb; |
955 | } | |
956 | ||
957 | /* called with rcu lock held */ | |
958 | static struct sk_buff *vrf_l3_rcv(struct net_device *vrf_dev, | |
959 | struct sk_buff *skb, | |
960 | u16 proto) | |
961 | { | |
962 | switch (proto) { | |
963 | case AF_INET: | |
964 | return vrf_ip_rcv(vrf_dev, skb); | |
965 | case AF_INET6: | |
966 | return vrf_ip6_rcv(vrf_dev, skb); | |
967 | } | |
968 | ||
969 | return skb; | |
970 | } | |
971 | ||
35402e31 DA |
972 | #if IS_ENABLED(CONFIG_IPV6) |
973 | static struct dst_entry *vrf_get_rt6_dst(const struct net_device *dev, | |
cd2a9e62 | 974 | struct flowi6 *fl6) |
35402e31 | 975 | { |
9ff74384 DA |
976 | bool need_strict = rt6_need_strict(&fl6->daddr); |
977 | struct net_vrf *vrf = netdev_priv(dev); | |
978 | struct net *net = dev_net(dev); | |
b0e95ccd | 979 | struct dst_entry *dst = NULL; |
9ff74384 | 980 | struct rt6_info *rt; |
35402e31 | 981 | |
9ff74384 DA |
982 | /* send to link-local or multicast address */ |
983 | if (need_strict) { | |
984 | int flags = RT6_LOOKUP_F_IFACE; | |
985 | ||
986 | /* VRF device does not have a link-local address and | |
987 | * sending packets to link-local or mcast addresses over | |
988 | * a VRF device does not make sense | |
989 | */ | |
990 | if (fl6->flowi6_oif == dev->ifindex) { | |
991 | struct dst_entry *dst = &net->ipv6.ip6_null_entry->dst; | |
992 | ||
993 | dst_hold(dst); | |
994 | return dst; | |
995 | } | |
996 | ||
997 | if (!ipv6_addr_any(&fl6->saddr)) | |
998 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
999 | ||
1000 | rt = vrf_ip6_route_lookup(net, dev, fl6, fl6->flowi6_oif, flags); | |
1001 | if (rt) | |
1002 | dst = &rt->dst; | |
1003 | ||
1004 | } else if (!(fl6->flowi6_flags & FLOWI_FLAG_L3MDEV_SRC)) { | |
b0e95ccd DA |
1005 | |
1006 | rcu_read_lock(); | |
1007 | ||
1008 | rt = rcu_dereference(vrf->rt6); | |
1009 | if (likely(rt)) { | |
1010 | dst = &rt->dst; | |
1011 | dst_hold(dst); | |
1012 | } | |
35402e31 | 1013 | |
b0e95ccd | 1014 | rcu_read_unlock(); |
35402e31 DA |
1015 | } |
1016 | ||
9ff74384 DA |
1017 | /* make sure oif is set to VRF device for lookup */ |
1018 | if (!need_strict) | |
1019 | fl6->flowi6_oif = dev->ifindex; | |
1020 | ||
b0e95ccd | 1021 | return dst; |
35402e31 | 1022 | } |
0d240e78 DA |
1023 | |
1024 | /* called under rcu_read_lock */ | |
1025 | static int vrf_get_saddr6(struct net_device *dev, const struct sock *sk, | |
1026 | struct flowi6 *fl6) | |
1027 | { | |
1028 | struct net *net = dev_net(dev); | |
1029 | struct dst_entry *dst; | |
1030 | struct rt6_info *rt; | |
1031 | int err; | |
1032 | ||
1033 | if (rt6_need_strict(&fl6->daddr)) { | |
1034 | rt = vrf_ip6_route_lookup(net, dev, fl6, fl6->flowi6_oif, | |
1035 | RT6_LOOKUP_F_IFACE); | |
1036 | if (unlikely(!rt)) | |
1037 | return 0; | |
1038 | ||
1039 | dst = &rt->dst; | |
1040 | } else { | |
1041 | __u8 flags = fl6->flowi6_flags; | |
1042 | ||
1043 | fl6->flowi6_flags |= FLOWI_FLAG_L3MDEV_SRC; | |
1044 | fl6->flowi6_flags |= FLOWI_FLAG_SKIP_NH_OIF; | |
1045 | ||
1046 | dst = ip6_route_output(net, sk, fl6); | |
1047 | rt = (struct rt6_info *)dst; | |
1048 | ||
1049 | fl6->flowi6_flags = flags; | |
1050 | } | |
1051 | ||
1052 | err = dst->error; | |
1053 | if (!err) { | |
1054 | err = ip6_route_get_saddr(net, rt, &fl6->daddr, | |
1055 | sk ? inet6_sk(sk)->srcprefs : 0, | |
1056 | &fl6->saddr); | |
1057 | } | |
1058 | ||
1059 | dst_release(dst); | |
1060 | ||
1061 | return err; | |
1062 | } | |
35402e31 DA |
1063 | #endif |
1064 | ||
ee15ee5d DA |
1065 | static const struct l3mdev_ops vrf_l3mdev_ops = { |
1066 | .l3mdev_fib_table = vrf_fib_table, | |
1067 | .l3mdev_get_rtable = vrf_get_rtable, | |
8cbb512c | 1068 | .l3mdev_get_saddr = vrf_get_saddr, |
74b20582 | 1069 | .l3mdev_l3_rcv = vrf_l3_rcv, |
35402e31 DA |
1070 | #if IS_ENABLED(CONFIG_IPV6) |
1071 | .l3mdev_get_rt6_dst = vrf_get_rt6_dst, | |
0d240e78 | 1072 | .l3mdev_get_saddr6 = vrf_get_saddr6, |
35402e31 | 1073 | #endif |
ee15ee5d DA |
1074 | }; |
1075 | ||
193125db DA |
1076 | static void vrf_get_drvinfo(struct net_device *dev, |
1077 | struct ethtool_drvinfo *info) | |
1078 | { | |
1079 | strlcpy(info->driver, DRV_NAME, sizeof(info->driver)); | |
1080 | strlcpy(info->version, DRV_VERSION, sizeof(info->version)); | |
1081 | } | |
1082 | ||
1083 | static const struct ethtool_ops vrf_ethtool_ops = { | |
1084 | .get_drvinfo = vrf_get_drvinfo, | |
1085 | }; | |
1086 | ||
1aa6c4f6 DA |
1087 | static inline size_t vrf_fib_rule_nl_size(void) |
1088 | { | |
1089 | size_t sz; | |
1090 | ||
1091 | sz = NLMSG_ALIGN(sizeof(struct fib_rule_hdr)); | |
1092 | sz += nla_total_size(sizeof(u8)); /* FRA_L3MDEV */ | |
1093 | sz += nla_total_size(sizeof(u32)); /* FRA_PRIORITY */ | |
1094 | ||
1095 | return sz; | |
1096 | } | |
1097 | ||
1098 | static int vrf_fib_rule(const struct net_device *dev, __u8 family, bool add_it) | |
1099 | { | |
1100 | struct fib_rule_hdr *frh; | |
1101 | struct nlmsghdr *nlh; | |
1102 | struct sk_buff *skb; | |
1103 | int err; | |
1104 | ||
e4348637 DA |
1105 | if (family == AF_INET6 && !ipv6_mod_enabled()) |
1106 | return 0; | |
1107 | ||
1aa6c4f6 DA |
1108 | skb = nlmsg_new(vrf_fib_rule_nl_size(), GFP_KERNEL); |
1109 | if (!skb) | |
1110 | return -ENOMEM; | |
1111 | ||
1112 | nlh = nlmsg_put(skb, 0, 0, 0, sizeof(*frh), 0); | |
1113 | if (!nlh) | |
1114 | goto nla_put_failure; | |
1115 | ||
1116 | /* rule only needs to appear once */ | |
1117 | nlh->nlmsg_flags &= NLM_F_EXCL; | |
1118 | ||
1119 | frh = nlmsg_data(nlh); | |
1120 | memset(frh, 0, sizeof(*frh)); | |
1121 | frh->family = family; | |
1122 | frh->action = FR_ACT_TO_TBL; | |
1123 | ||
1124 | if (nla_put_u32(skb, FRA_L3MDEV, 1)) | |
1125 | goto nla_put_failure; | |
1126 | ||
1127 | if (nla_put_u32(skb, FRA_PRIORITY, FIB_RULE_PREF)) | |
1128 | goto nla_put_failure; | |
1129 | ||
1130 | nlmsg_end(skb, nlh); | |
1131 | ||
1132 | /* fib_nl_{new,del}rule handling looks for net from skb->sk */ | |
1133 | skb->sk = dev_net(dev)->rtnl; | |
1134 | if (add_it) { | |
1135 | err = fib_nl_newrule(skb, nlh); | |
1136 | if (err == -EEXIST) | |
1137 | err = 0; | |
1138 | } else { | |
1139 | err = fib_nl_delrule(skb, nlh); | |
1140 | if (err == -ENOENT) | |
1141 | err = 0; | |
1142 | } | |
1143 | nlmsg_free(skb); | |
1144 | ||
1145 | return err; | |
1146 | ||
1147 | nla_put_failure: | |
1148 | nlmsg_free(skb); | |
1149 | ||
1150 | return -EMSGSIZE; | |
1151 | } | |
1152 | ||
1153 | static int vrf_add_fib_rules(const struct net_device *dev) | |
1154 | { | |
1155 | int err; | |
1156 | ||
1157 | err = vrf_fib_rule(dev, AF_INET, true); | |
1158 | if (err < 0) | |
1159 | goto out_err; | |
1160 | ||
1161 | err = vrf_fib_rule(dev, AF_INET6, true); | |
1162 | if (err < 0) | |
1163 | goto ipv6_err; | |
1164 | ||
1165 | return 0; | |
1166 | ||
1167 | ipv6_err: | |
1168 | vrf_fib_rule(dev, AF_INET, false); | |
1169 | ||
1170 | out_err: | |
1171 | netdev_err(dev, "Failed to add FIB rules.\n"); | |
1172 | return err; | |
1173 | } | |
1174 | ||
193125db DA |
1175 | static void vrf_setup(struct net_device *dev) |
1176 | { | |
1177 | ether_setup(dev); | |
1178 | ||
1179 | /* Initialize the device structure. */ | |
1180 | dev->netdev_ops = &vrf_netdev_ops; | |
ee15ee5d | 1181 | dev->l3mdev_ops = &vrf_l3mdev_ops; |
193125db DA |
1182 | dev->ethtool_ops = &vrf_ethtool_ops; |
1183 | dev->destructor = free_netdev; | |
1184 | ||
1185 | /* Fill in device structure with ethernet-generic values. */ | |
1186 | eth_hw_addr_random(dev); | |
1187 | ||
1188 | /* don't acquire vrf device's netif_tx_lock when transmitting */ | |
1189 | dev->features |= NETIF_F_LLTX; | |
1190 | ||
1191 | /* don't allow vrf devices to change network namespaces. */ | |
1192 | dev->features |= NETIF_F_NETNS_LOCAL; | |
7889681f DA |
1193 | |
1194 | /* does not make sense for a VLAN to be added to a vrf device */ | |
1195 | dev->features |= NETIF_F_VLAN_CHALLENGED; | |
1196 | ||
1197 | /* enable offload features */ | |
1198 | dev->features |= NETIF_F_GSO_SOFTWARE; | |
1199 | dev->features |= NETIF_F_RXCSUM | NETIF_F_HW_CSUM; | |
1200 | dev->features |= NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA; | |
1201 | ||
1202 | dev->hw_features = dev->features; | |
1203 | dev->hw_enc_features = dev->features; | |
1204 | ||
1205 | /* default to no qdisc; user can add if desired */ | |
1206 | dev->priv_flags |= IFF_NO_QUEUE; | |
193125db DA |
1207 | } |
1208 | ||
1209 | static int vrf_validate(struct nlattr *tb[], struct nlattr *data[]) | |
1210 | { | |
1211 | if (tb[IFLA_ADDRESS]) { | |
1212 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) | |
1213 | return -EINVAL; | |
1214 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) | |
1215 | return -EADDRNOTAVAIL; | |
1216 | } | |
1217 | return 0; | |
1218 | } | |
1219 | ||
1220 | static void vrf_dellink(struct net_device *dev, struct list_head *head) | |
1221 | { | |
193125db DA |
1222 | unregister_netdevice_queue(dev, head); |
1223 | } | |
1224 | ||
1225 | static int vrf_newlink(struct net *src_net, struct net_device *dev, | |
1226 | struct nlattr *tb[], struct nlattr *data[]) | |
1227 | { | |
1228 | struct net_vrf *vrf = netdev_priv(dev); | |
1aa6c4f6 | 1229 | int err; |
193125db DA |
1230 | |
1231 | if (!data || !data[IFLA_VRF_TABLE]) | |
1232 | return -EINVAL; | |
1233 | ||
1234 | vrf->tb_id = nla_get_u32(data[IFLA_VRF_TABLE]); | |
1235 | ||
007979ea | 1236 | dev->priv_flags |= IFF_L3MDEV_MASTER; |
193125db | 1237 | |
1aa6c4f6 DA |
1238 | err = register_netdevice(dev); |
1239 | if (err) | |
1240 | goto out; | |
1241 | ||
1242 | if (add_fib_rules) { | |
1243 | err = vrf_add_fib_rules(dev); | |
1244 | if (err) { | |
1245 | unregister_netdevice(dev); | |
1246 | goto out; | |
1247 | } | |
1248 | add_fib_rules = false; | |
1249 | } | |
1250 | ||
1251 | out: | |
1252 | return err; | |
193125db DA |
1253 | } |
1254 | ||
1255 | static size_t vrf_nl_getsize(const struct net_device *dev) | |
1256 | { | |
1257 | return nla_total_size(sizeof(u32)); /* IFLA_VRF_TABLE */ | |
1258 | } | |
1259 | ||
1260 | static int vrf_fillinfo(struct sk_buff *skb, | |
1261 | const struct net_device *dev) | |
1262 | { | |
1263 | struct net_vrf *vrf = netdev_priv(dev); | |
1264 | ||
1265 | return nla_put_u32(skb, IFLA_VRF_TABLE, vrf->tb_id); | |
1266 | } | |
1267 | ||
67eb0331 DA |
1268 | static size_t vrf_get_slave_size(const struct net_device *bond_dev, |
1269 | const struct net_device *slave_dev) | |
1270 | { | |
1271 | return nla_total_size(sizeof(u32)); /* IFLA_VRF_PORT_TABLE */ | |
1272 | } | |
1273 | ||
1274 | static int vrf_fill_slave_info(struct sk_buff *skb, | |
1275 | const struct net_device *vrf_dev, | |
1276 | const struct net_device *slave_dev) | |
1277 | { | |
1278 | struct net_vrf *vrf = netdev_priv(vrf_dev); | |
1279 | ||
1280 | if (nla_put_u32(skb, IFLA_VRF_PORT_TABLE, vrf->tb_id)) | |
1281 | return -EMSGSIZE; | |
1282 | ||
1283 | return 0; | |
1284 | } | |
1285 | ||
193125db DA |
1286 | static const struct nla_policy vrf_nl_policy[IFLA_VRF_MAX + 1] = { |
1287 | [IFLA_VRF_TABLE] = { .type = NLA_U32 }, | |
1288 | }; | |
1289 | ||
1290 | static struct rtnl_link_ops vrf_link_ops __read_mostly = { | |
1291 | .kind = DRV_NAME, | |
1292 | .priv_size = sizeof(struct net_vrf), | |
1293 | ||
1294 | .get_size = vrf_nl_getsize, | |
1295 | .policy = vrf_nl_policy, | |
1296 | .validate = vrf_validate, | |
1297 | .fill_info = vrf_fillinfo, | |
1298 | ||
67eb0331 DA |
1299 | .get_slave_size = vrf_get_slave_size, |
1300 | .fill_slave_info = vrf_fill_slave_info, | |
1301 | ||
193125db DA |
1302 | .newlink = vrf_newlink, |
1303 | .dellink = vrf_dellink, | |
1304 | .setup = vrf_setup, | |
1305 | .maxtype = IFLA_VRF_MAX, | |
1306 | }; | |
1307 | ||
1308 | static int vrf_device_event(struct notifier_block *unused, | |
1309 | unsigned long event, void *ptr) | |
1310 | { | |
1311 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
1312 | ||
1313 | /* only care about unregister events to drop slave references */ | |
1314 | if (event == NETDEV_UNREGISTER) { | |
193125db DA |
1315 | struct net_device *vrf_dev; |
1316 | ||
fee6d4c7 | 1317 | if (!netif_is_l3_slave(dev)) |
193125db DA |
1318 | goto out; |
1319 | ||
58aa9087 NA |
1320 | vrf_dev = netdev_master_upper_dev_get(dev); |
1321 | vrf_del_slave(vrf_dev, dev); | |
193125db DA |
1322 | } |
1323 | out: | |
1324 | return NOTIFY_DONE; | |
1325 | } | |
1326 | ||
1327 | static struct notifier_block vrf_notifier_block __read_mostly = { | |
1328 | .notifier_call = vrf_device_event, | |
1329 | }; | |
1330 | ||
1331 | static int __init vrf_init_module(void) | |
1332 | { | |
1333 | int rc; | |
1334 | ||
193125db DA |
1335 | register_netdevice_notifier(&vrf_notifier_block); |
1336 | ||
1337 | rc = rtnl_link_register(&vrf_link_ops); | |
1338 | if (rc < 0) | |
1339 | goto error; | |
1340 | ||
1341 | return 0; | |
1342 | ||
1343 | error: | |
1344 | unregister_netdevice_notifier(&vrf_notifier_block); | |
193125db DA |
1345 | return rc; |
1346 | } | |
1347 | ||
193125db | 1348 | module_init(vrf_init_module); |
193125db DA |
1349 | MODULE_AUTHOR("Shrijeet Mukherjee, David Ahern"); |
1350 | MODULE_DESCRIPTION("Device driver to instantiate VRF domains"); | |
1351 | MODULE_LICENSE("GPL"); | |
1352 | MODULE_ALIAS_RTNL_LINK(DRV_NAME); | |
1353 | MODULE_VERSION(DRV_VERSION); |