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> |
193125db | 38 | |
8cbb512c DA |
39 | #define RT_FL_TOS(oldflp4) \ |
40 | ((oldflp4)->flowi4_tos & (IPTOS_RT_MASK | RTO_ONLINK)) | |
41 | ||
193125db DA |
42 | #define DRV_NAME "vrf" |
43 | #define DRV_VERSION "1.0" | |
44 | ||
ec539514 | 45 | struct net_vrf { |
b0e95ccd | 46 | struct rtable __rcu *rth; |
afe80a49 | 47 | struct rtable __rcu *rth_local; |
b0e95ccd | 48 | struct rt6_info __rcu *rt6; |
ec539514 DA |
49 | u32 tb_id; |
50 | }; | |
51 | ||
193125db DA |
52 | struct pcpu_dstats { |
53 | u64 tx_pkts; | |
54 | u64 tx_bytes; | |
55 | u64 tx_drps; | |
56 | u64 rx_pkts; | |
57 | u64 rx_bytes; | |
afe80a49 | 58 | u64 rx_drps; |
193125db DA |
59 | struct u64_stats_sync syncp; |
60 | }; | |
61 | ||
afe80a49 DA |
62 | static void vrf_rx_stats(struct net_device *dev, int len) |
63 | { | |
64 | struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats); | |
65 | ||
66 | u64_stats_update_begin(&dstats->syncp); | |
67 | dstats->rx_pkts++; | |
68 | dstats->rx_bytes += len; | |
69 | u64_stats_update_end(&dstats->syncp); | |
70 | } | |
71 | ||
57b8efa1 NA |
72 | static void vrf_tx_error(struct net_device *vrf_dev, struct sk_buff *skb) |
73 | { | |
74 | vrf_dev->stats.tx_errors++; | |
75 | kfree_skb(skb); | |
76 | } | |
77 | ||
193125db DA |
78 | static struct rtnl_link_stats64 *vrf_get_stats64(struct net_device *dev, |
79 | struct rtnl_link_stats64 *stats) | |
80 | { | |
81 | int i; | |
82 | ||
83 | for_each_possible_cpu(i) { | |
84 | const struct pcpu_dstats *dstats; | |
85 | u64 tbytes, tpkts, tdrops, rbytes, rpkts; | |
86 | unsigned int start; | |
87 | ||
88 | dstats = per_cpu_ptr(dev->dstats, i); | |
89 | do { | |
90 | start = u64_stats_fetch_begin_irq(&dstats->syncp); | |
91 | tbytes = dstats->tx_bytes; | |
92 | tpkts = dstats->tx_pkts; | |
93 | tdrops = dstats->tx_drps; | |
94 | rbytes = dstats->rx_bytes; | |
95 | rpkts = dstats->rx_pkts; | |
96 | } while (u64_stats_fetch_retry_irq(&dstats->syncp, start)); | |
97 | stats->tx_bytes += tbytes; | |
98 | stats->tx_packets += tpkts; | |
99 | stats->tx_dropped += tdrops; | |
100 | stats->rx_bytes += rbytes; | |
101 | stats->rx_packets += rpkts; | |
102 | } | |
103 | return stats; | |
104 | } | |
105 | ||
afe80a49 DA |
106 | /* Local traffic destined to local address. Reinsert the packet to rx |
107 | * path, similar to loopback handling. | |
108 | */ | |
109 | static int vrf_local_xmit(struct sk_buff *skb, struct net_device *dev, | |
110 | struct dst_entry *dst) | |
111 | { | |
112 | int len = skb->len; | |
113 | ||
114 | skb_orphan(skb); | |
115 | ||
116 | skb_dst_set(skb, dst); | |
117 | skb_dst_force(skb); | |
118 | ||
119 | /* set pkt_type to avoid skb hitting packet taps twice - | |
120 | * once on Tx and again in Rx processing | |
121 | */ | |
122 | skb->pkt_type = PACKET_LOOPBACK; | |
123 | ||
124 | skb->protocol = eth_type_trans(skb, dev); | |
125 | ||
126 | if (likely(netif_rx(skb) == NET_RX_SUCCESS)) | |
127 | vrf_rx_stats(dev, len); | |
128 | else | |
129 | this_cpu_inc(dev->dstats->rx_drps); | |
130 | ||
131 | return NETDEV_TX_OK; | |
132 | } | |
133 | ||
35402e31 DA |
134 | #if IS_ENABLED(CONFIG_IPV6) |
135 | static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb, | |
136 | struct net_device *dev) | |
137 | { | |
138 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
139 | struct net *net = dev_net(skb->dev); | |
140 | struct flowi6 fl6 = { | |
141 | /* needed to match OIF rule */ | |
142 | .flowi6_oif = dev->ifindex, | |
143 | .flowi6_iif = LOOPBACK_IFINDEX, | |
144 | .daddr = iph->daddr, | |
145 | .saddr = iph->saddr, | |
146 | .flowlabel = ip6_flowinfo(iph), | |
147 | .flowi6_mark = skb->mark, | |
148 | .flowi6_proto = iph->nexthdr, | |
149 | .flowi6_flags = FLOWI_FLAG_L3MDEV_SRC | FLOWI_FLAG_SKIP_NH_OIF, | |
150 | }; | |
151 | int ret = NET_XMIT_DROP; | |
152 | struct dst_entry *dst; | |
153 | struct dst_entry *dst_null = &net->ipv6.ip6_null_entry->dst; | |
154 | ||
155 | dst = ip6_route_output(net, NULL, &fl6); | |
156 | if (dst == dst_null) | |
157 | goto err; | |
158 | ||
159 | skb_dst_drop(skb); | |
160 | skb_dst_set(skb, dst); | |
161 | ||
911a66fb DA |
162 | /* strip the ethernet header added for pass through VRF device */ |
163 | __skb_pull(skb, skb_network_offset(skb)); | |
164 | ||
35402e31 DA |
165 | ret = ip6_local_out(net, skb->sk, skb); |
166 | if (unlikely(net_xmit_eval(ret))) | |
167 | dev->stats.tx_errors++; | |
168 | else | |
169 | ret = NET_XMIT_SUCCESS; | |
170 | ||
171 | return ret; | |
172 | err: | |
173 | vrf_tx_error(dev, skb); | |
174 | return NET_XMIT_DROP; | |
175 | } | |
176 | #else | |
193125db DA |
177 | static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb, |
178 | struct net_device *dev) | |
179 | { | |
57b8efa1 NA |
180 | vrf_tx_error(dev, skb); |
181 | return NET_XMIT_DROP; | |
193125db | 182 | } |
35402e31 | 183 | #endif |
193125db | 184 | |
193125db DA |
185 | static netdev_tx_t vrf_process_v4_outbound(struct sk_buff *skb, |
186 | struct net_device *vrf_dev) | |
187 | { | |
188 | struct iphdr *ip4h = ip_hdr(skb); | |
189 | int ret = NET_XMIT_DROP; | |
190 | struct flowi4 fl4 = { | |
191 | /* needed to match OIF rule */ | |
192 | .flowi4_oif = vrf_dev->ifindex, | |
193 | .flowi4_iif = LOOPBACK_IFINDEX, | |
194 | .flowi4_tos = RT_TOS(ip4h->tos), | |
6e2895a8 | 195 | .flowi4_flags = FLOWI_FLAG_ANYSRC | FLOWI_FLAG_L3MDEV_SRC | |
58189ca7 | 196 | FLOWI_FLAG_SKIP_NH_OIF, |
193125db DA |
197 | .daddr = ip4h->daddr, |
198 | }; | |
911a66fb DA |
199 | struct net *net = dev_net(vrf_dev); |
200 | struct rtable *rt; | |
201 | ||
202 | rt = ip_route_output_flow(net, &fl4, NULL); | |
203 | if (IS_ERR(rt)) | |
204 | goto err; | |
193125db | 205 | |
911a66fb DA |
206 | if (rt->rt_type != RTN_UNICAST && rt->rt_type != RTN_LOCAL) { |
207 | ip_rt_put(rt); | |
193125db | 208 | goto err; |
911a66fb DA |
209 | } |
210 | ||
211 | skb_dst_drop(skb); | |
afe80a49 DA |
212 | |
213 | /* if dst.dev is loopback or the VRF device again this is locally | |
214 | * originated traffic destined to a local address. Short circuit | |
215 | * to Rx path using our local dst | |
216 | */ | |
217 | if (rt->dst.dev == net->loopback_dev || rt->dst.dev == vrf_dev) { | |
218 | struct net_vrf *vrf = netdev_priv(vrf_dev); | |
219 | struct rtable *rth_local; | |
220 | struct dst_entry *dst = NULL; | |
221 | ||
222 | ip_rt_put(rt); | |
223 | ||
224 | rcu_read_lock(); | |
225 | ||
226 | rth_local = rcu_dereference(vrf->rth_local); | |
227 | if (likely(rth_local)) { | |
228 | dst = &rth_local->dst; | |
229 | dst_hold(dst); | |
230 | } | |
231 | ||
232 | rcu_read_unlock(); | |
233 | ||
234 | if (unlikely(!dst)) | |
235 | goto err; | |
236 | ||
237 | return vrf_local_xmit(skb, vrf_dev, dst); | |
238 | } | |
239 | ||
911a66fb DA |
240 | skb_dst_set(skb, &rt->dst); |
241 | ||
242 | /* strip the ethernet header added for pass through VRF device */ | |
243 | __skb_pull(skb, skb_network_offset(skb)); | |
193125db DA |
244 | |
245 | if (!ip4h->saddr) { | |
246 | ip4h->saddr = inet_select_addr(skb_dst(skb)->dev, 0, | |
247 | RT_SCOPE_LINK); | |
248 | } | |
249 | ||
33224b16 | 250 | ret = ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb); |
193125db DA |
251 | if (unlikely(net_xmit_eval(ret))) |
252 | vrf_dev->stats.tx_errors++; | |
253 | else | |
254 | ret = NET_XMIT_SUCCESS; | |
255 | ||
256 | out: | |
257 | return ret; | |
258 | err: | |
57b8efa1 | 259 | vrf_tx_error(vrf_dev, skb); |
193125db DA |
260 | goto out; |
261 | } | |
262 | ||
263 | static netdev_tx_t is_ip_tx_frame(struct sk_buff *skb, struct net_device *dev) | |
264 | { | |
265 | switch (skb->protocol) { | |
266 | case htons(ETH_P_IP): | |
267 | return vrf_process_v4_outbound(skb, dev); | |
268 | case htons(ETH_P_IPV6): | |
269 | return vrf_process_v6_outbound(skb, dev); | |
270 | default: | |
57b8efa1 | 271 | vrf_tx_error(dev, skb); |
193125db DA |
272 | return NET_XMIT_DROP; |
273 | } | |
274 | } | |
275 | ||
276 | static netdev_tx_t vrf_xmit(struct sk_buff *skb, struct net_device *dev) | |
277 | { | |
278 | netdev_tx_t ret = is_ip_tx_frame(skb, dev); | |
279 | ||
280 | if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { | |
281 | struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats); | |
282 | ||
283 | u64_stats_update_begin(&dstats->syncp); | |
284 | dstats->tx_pkts++; | |
285 | dstats->tx_bytes += skb->len; | |
286 | u64_stats_update_end(&dstats->syncp); | |
287 | } else { | |
288 | this_cpu_inc(dev->dstats->tx_drps); | |
289 | } | |
290 | ||
291 | return ret; | |
292 | } | |
293 | ||
35402e31 | 294 | #if IS_ENABLED(CONFIG_IPV6) |
35402e31 DA |
295 | /* modelled after ip6_finish_output2 */ |
296 | static int vrf_finish_output6(struct net *net, struct sock *sk, | |
297 | struct sk_buff *skb) | |
298 | { | |
299 | struct dst_entry *dst = skb_dst(skb); | |
300 | struct net_device *dev = dst->dev; | |
301 | struct neighbour *neigh; | |
302 | struct in6_addr *nexthop; | |
303 | int ret; | |
304 | ||
305 | skb->protocol = htons(ETH_P_IPV6); | |
306 | skb->dev = dev; | |
307 | ||
308 | rcu_read_lock_bh(); | |
309 | nexthop = rt6_nexthop((struct rt6_info *)dst, &ipv6_hdr(skb)->daddr); | |
310 | neigh = __ipv6_neigh_lookup_noref(dst->dev, nexthop); | |
311 | if (unlikely(!neigh)) | |
312 | neigh = __neigh_create(&nd_tbl, nexthop, dst->dev, false); | |
313 | if (!IS_ERR(neigh)) { | |
314 | ret = dst_neigh_output(dst, neigh, skb); | |
315 | rcu_read_unlock_bh(); | |
316 | return ret; | |
317 | } | |
318 | rcu_read_unlock_bh(); | |
319 | ||
320 | IP6_INC_STATS(dev_net(dst->dev), | |
321 | ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES); | |
322 | kfree_skb(skb); | |
323 | return -EINVAL; | |
324 | } | |
325 | ||
326 | /* modelled after ip6_output */ | |
327 | static int vrf_output6(struct net *net, struct sock *sk, struct sk_buff *skb) | |
328 | { | |
329 | return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING, | |
330 | net, sk, skb, NULL, skb_dst(skb)->dev, | |
331 | vrf_finish_output6, | |
332 | !(IP6CB(skb)->flags & IP6SKB_REROUTED)); | |
333 | } | |
334 | ||
b0e95ccd | 335 | /* holding rtnl */ |
9ab179d8 | 336 | static void vrf_rt6_release(struct net_vrf *vrf) |
35402e31 | 337 | { |
b0e95ccd DA |
338 | struct rt6_info *rt6 = rtnl_dereference(vrf->rt6); |
339 | ||
3d9dc408 | 340 | rcu_assign_pointer(vrf->rt6, NULL); |
b0e95ccd DA |
341 | |
342 | if (rt6) | |
343 | dst_release(&rt6->dst); | |
35402e31 DA |
344 | } |
345 | ||
346 | static int vrf_rt6_create(struct net_device *dev) | |
347 | { | |
348 | struct net_vrf *vrf = netdev_priv(dev); | |
9ab179d8 | 349 | struct net *net = dev_net(dev); |
b3b4663c | 350 | struct fib6_table *rt6i_table; |
3d9dc408 | 351 | struct rt6_info *rt6; |
35402e31 DA |
352 | int rc = -ENOMEM; |
353 | ||
b3b4663c DA |
354 | rt6i_table = fib6_new_table(net, vrf->tb_id); |
355 | if (!rt6i_table) | |
356 | goto out; | |
357 | ||
3d9dc408 DM |
358 | rt6 = ip6_dst_alloc(net, dev, |
359 | DST_HOST | DST_NOPOLICY | DST_NOXFRM | DST_NOCACHE); | |
35402e31 DA |
360 | if (!rt6) |
361 | goto out; | |
362 | ||
9ab179d8 | 363 | dst_hold(&rt6->dst); |
b3b4663c DA |
364 | |
365 | rt6->rt6i_table = rt6i_table; | |
366 | rt6->dst.output = vrf_output6; | |
b0e95ccd DA |
367 | rcu_assign_pointer(vrf->rt6, rt6); |
368 | ||
35402e31 DA |
369 | rc = 0; |
370 | out: | |
371 | return rc; | |
372 | } | |
373 | #else | |
9ab179d8 | 374 | static void vrf_rt6_release(struct net_vrf *vrf) |
35402e31 DA |
375 | { |
376 | } | |
377 | ||
378 | static int vrf_rt6_create(struct net_device *dev) | |
379 | { | |
380 | return 0; | |
381 | } | |
382 | #endif | |
383 | ||
8f58336d | 384 | /* modelled after ip_finish_output2 */ |
0c4b51f0 | 385 | static int vrf_finish_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
193125db | 386 | { |
8f58336d DA |
387 | struct dst_entry *dst = skb_dst(skb); |
388 | struct rtable *rt = (struct rtable *)dst; | |
389 | struct net_device *dev = dst->dev; | |
390 | unsigned int hh_len = LL_RESERVED_SPACE(dev); | |
391 | struct neighbour *neigh; | |
392 | u32 nexthop; | |
393 | int ret = -EINVAL; | |
394 | ||
395 | /* Be paranoid, rather than too clever. */ | |
396 | if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) { | |
397 | struct sk_buff *skb2; | |
398 | ||
399 | skb2 = skb_realloc_headroom(skb, LL_RESERVED_SPACE(dev)); | |
400 | if (!skb2) { | |
401 | ret = -ENOMEM; | |
402 | goto err; | |
403 | } | |
404 | if (skb->sk) | |
405 | skb_set_owner_w(skb2, skb->sk); | |
406 | ||
407 | consume_skb(skb); | |
408 | skb = skb2; | |
409 | } | |
410 | ||
411 | rcu_read_lock_bh(); | |
412 | ||
413 | nexthop = (__force u32)rt_nexthop(rt, ip_hdr(skb)->daddr); | |
414 | neigh = __ipv4_neigh_lookup_noref(dev, nexthop); | |
415 | if (unlikely(!neigh)) | |
416 | neigh = __neigh_create(&arp_tbl, &nexthop, dev, false); | |
417 | if (!IS_ERR(neigh)) | |
418 | ret = dst_neigh_output(dst, neigh, skb); | |
419 | ||
420 | rcu_read_unlock_bh(); | |
421 | err: | |
422 | if (unlikely(ret < 0)) | |
423 | vrf_tx_error(skb->dev, skb); | |
424 | return ret; | |
193125db DA |
425 | } |
426 | ||
ede2059d | 427 | static int vrf_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
193125db DA |
428 | { |
429 | struct net_device *dev = skb_dst(skb)->dev; | |
430 | ||
29a26a56 | 431 | IP_UPD_PO_STATS(net, IPSTATS_MIB_OUT, skb->len); |
193125db DA |
432 | |
433 | skb->dev = dev; | |
434 | skb->protocol = htons(ETH_P_IP); | |
435 | ||
29a26a56 EB |
436 | return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING, |
437 | net, sk, skb, NULL, dev, | |
8f58336d | 438 | vrf_finish_output, |
193125db DA |
439 | !(IPCB(skb)->flags & IPSKB_REROUTED)); |
440 | } | |
441 | ||
b0e95ccd | 442 | /* holding rtnl */ |
9ab179d8 | 443 | static void vrf_rtable_release(struct net_vrf *vrf) |
193125db | 444 | { |
b0e95ccd | 445 | struct rtable *rth = rtnl_dereference(vrf->rth); |
afe80a49 | 446 | struct rtable *rth_local = rtnl_dereference(vrf->rth_local); |
b0e95ccd | 447 | |
afe80a49 DA |
448 | RCU_INIT_POINTER(vrf->rth, NULL); |
449 | RCU_INIT_POINTER(vrf->rth_local, NULL); | |
450 | synchronize_rcu(); | |
193125db | 451 | |
b0e95ccd DA |
452 | if (rth) |
453 | dst_release(&rth->dst); | |
afe80a49 DA |
454 | |
455 | if (rth_local) | |
456 | dst_release(&rth_local->dst); | |
193125db DA |
457 | } |
458 | ||
b0e95ccd | 459 | static int vrf_rtable_create(struct net_device *dev) |
193125db | 460 | { |
b7503e0c | 461 | struct net_vrf *vrf = netdev_priv(dev); |
afe80a49 | 462 | struct rtable *rth, *rth_local; |
193125db | 463 | |
b3b4663c | 464 | if (!fib_new_table(dev_net(dev), vrf->tb_id)) |
b0e95ccd | 465 | return -ENOMEM; |
b3b4663c | 466 | |
afe80a49 | 467 | /* create a dst for routing packets out through a VRF device */ |
9ab179d8 | 468 | rth = rt_dst_alloc(dev, 0, RTN_UNICAST, 1, 1, 0); |
b0e95ccd DA |
469 | if (!rth) |
470 | return -ENOMEM; | |
193125db | 471 | |
afe80a49 DA |
472 | /* create a dst for local ingress routing - packets sent locally |
473 | * to local address via the VRF device as a loopback | |
474 | */ | |
475 | rth_local = rt_dst_alloc(dev, RTCF_LOCAL, RTN_LOCAL, 1, 1, 0); | |
476 | if (!rth_local) { | |
477 | dst_release(&rth->dst); | |
478 | return -ENOMEM; | |
479 | } | |
480 | ||
b0e95ccd DA |
481 | rth->dst.output = vrf_output; |
482 | rth->rt_table_id = vrf->tb_id; | |
483 | ||
afe80a49 DA |
484 | rth_local->rt_table_id = vrf->tb_id; |
485 | ||
b0e95ccd | 486 | rcu_assign_pointer(vrf->rth, rth); |
afe80a49 | 487 | rcu_assign_pointer(vrf->rth_local, rth_local); |
b0e95ccd DA |
488 | |
489 | return 0; | |
193125db DA |
490 | } |
491 | ||
492 | /**************************** device handling ********************/ | |
493 | ||
494 | /* cycle interface to flush neighbor cache and move routes across tables */ | |
495 | static void cycle_netdev(struct net_device *dev) | |
496 | { | |
497 | unsigned int flags = dev->flags; | |
498 | int ret; | |
499 | ||
500 | if (!netif_running(dev)) | |
501 | return; | |
502 | ||
503 | ret = dev_change_flags(dev, flags & ~IFF_UP); | |
504 | if (ret >= 0) | |
505 | ret = dev_change_flags(dev, flags); | |
506 | ||
507 | if (ret < 0) { | |
508 | netdev_err(dev, | |
509 | "Failed to cycle device %s; route tables might be wrong!\n", | |
510 | dev->name); | |
511 | } | |
512 | } | |
513 | ||
193125db DA |
514 | static int do_vrf_add_slave(struct net_device *dev, struct net_device *port_dev) |
515 | { | |
bad53162 | 516 | int ret; |
193125db | 517 | |
29bf24af | 518 | ret = netdev_master_upper_dev_link(port_dev, dev, NULL, NULL); |
193125db | 519 | if (ret < 0) |
74b20582 | 520 | return ret; |
193125db | 521 | |
fee6d4c7 | 522 | port_dev->priv_flags |= IFF_L3MDEV_SLAVE; |
193125db DA |
523 | cycle_netdev(port_dev); |
524 | ||
525 | return 0; | |
193125db DA |
526 | } |
527 | ||
528 | static int vrf_add_slave(struct net_device *dev, struct net_device *port_dev) | |
529 | { | |
fee6d4c7 | 530 | if (netif_is_l3_master(port_dev) || netif_is_l3_slave(port_dev)) |
193125db DA |
531 | return -EINVAL; |
532 | ||
533 | return do_vrf_add_slave(dev, port_dev); | |
534 | } | |
535 | ||
536 | /* inverse of do_vrf_add_slave */ | |
537 | static int do_vrf_del_slave(struct net_device *dev, struct net_device *port_dev) | |
538 | { | |
193125db | 539 | netdev_upper_dev_unlink(port_dev, dev); |
fee6d4c7 | 540 | port_dev->priv_flags &= ~IFF_L3MDEV_SLAVE; |
193125db | 541 | |
193125db DA |
542 | cycle_netdev(port_dev); |
543 | ||
193125db DA |
544 | return 0; |
545 | } | |
546 | ||
547 | static int vrf_del_slave(struct net_device *dev, struct net_device *port_dev) | |
548 | { | |
193125db DA |
549 | return do_vrf_del_slave(dev, port_dev); |
550 | } | |
551 | ||
552 | static void vrf_dev_uninit(struct net_device *dev) | |
553 | { | |
554 | struct net_vrf *vrf = netdev_priv(dev); | |
bad53162 NA |
555 | struct net_device *port_dev; |
556 | struct list_head *iter; | |
193125db | 557 | |
9ab179d8 DA |
558 | vrf_rtable_release(vrf); |
559 | vrf_rt6_release(vrf); | |
193125db | 560 | |
bad53162 NA |
561 | netdev_for_each_lower_dev(dev, port_dev, iter) |
562 | vrf_del_slave(dev, port_dev); | |
193125db | 563 | |
3a4a27d3 | 564 | free_percpu(dev->dstats); |
193125db DA |
565 | dev->dstats = NULL; |
566 | } | |
567 | ||
568 | static int vrf_dev_init(struct net_device *dev) | |
569 | { | |
570 | struct net_vrf *vrf = netdev_priv(dev); | |
571 | ||
193125db DA |
572 | dev->dstats = netdev_alloc_pcpu_stats(struct pcpu_dstats); |
573 | if (!dev->dstats) | |
574 | goto out_nomem; | |
575 | ||
576 | /* create the default dst which points back to us */ | |
b0e95ccd | 577 | if (vrf_rtable_create(dev) != 0) |
193125db DA |
578 | goto out_stats; |
579 | ||
35402e31 DA |
580 | if (vrf_rt6_create(dev) != 0) |
581 | goto out_rth; | |
582 | ||
193125db DA |
583 | dev->flags = IFF_MASTER | IFF_NOARP; |
584 | ||
b87ab6b8 DA |
585 | /* MTU is irrelevant for VRF device; set to 64k similar to lo */ |
586 | dev->mtu = 64 * 1024; | |
587 | ||
588 | /* similarly, oper state is irrelevant; set to up to avoid confusion */ | |
589 | dev->operstate = IF_OPER_UP; | |
590 | ||
193125db DA |
591 | return 0; |
592 | ||
35402e31 | 593 | out_rth: |
9ab179d8 | 594 | vrf_rtable_release(vrf); |
193125db DA |
595 | out_stats: |
596 | free_percpu(dev->dstats); | |
597 | dev->dstats = NULL; | |
598 | out_nomem: | |
599 | return -ENOMEM; | |
600 | } | |
601 | ||
602 | static const struct net_device_ops vrf_netdev_ops = { | |
603 | .ndo_init = vrf_dev_init, | |
604 | .ndo_uninit = vrf_dev_uninit, | |
605 | .ndo_start_xmit = vrf_xmit, | |
606 | .ndo_get_stats64 = vrf_get_stats64, | |
607 | .ndo_add_slave = vrf_add_slave, | |
608 | .ndo_del_slave = vrf_del_slave, | |
609 | }; | |
610 | ||
ee15ee5d DA |
611 | static u32 vrf_fib_table(const struct net_device *dev) |
612 | { | |
613 | struct net_vrf *vrf = netdev_priv(dev); | |
614 | ||
615 | return vrf->tb_id; | |
616 | } | |
617 | ||
618 | static struct rtable *vrf_get_rtable(const struct net_device *dev, | |
619 | const struct flowi4 *fl4) | |
620 | { | |
621 | struct rtable *rth = NULL; | |
622 | ||
6e2895a8 | 623 | if (!(fl4->flowi4_flags & FLOWI_FLAG_L3MDEV_SRC)) { |
ee15ee5d DA |
624 | struct net_vrf *vrf = netdev_priv(dev); |
625 | ||
b0e95ccd DA |
626 | rcu_read_lock(); |
627 | ||
628 | rth = rcu_dereference(vrf->rth); | |
629 | if (likely(rth)) | |
630 | dst_hold(&rth->dst); | |
631 | ||
632 | rcu_read_unlock(); | |
ee15ee5d DA |
633 | } |
634 | ||
635 | return rth; | |
636 | } | |
637 | ||
8cbb512c | 638 | /* called under rcu_read_lock */ |
b5bdacf3 | 639 | static int vrf_get_saddr(struct net_device *dev, struct flowi4 *fl4) |
8cbb512c DA |
640 | { |
641 | struct fib_result res = { .tclassid = 0 }; | |
642 | struct net *net = dev_net(dev); | |
643 | u32 orig_tos = fl4->flowi4_tos; | |
644 | u8 flags = fl4->flowi4_flags; | |
645 | u8 scope = fl4->flowi4_scope; | |
646 | u8 tos = RT_FL_TOS(fl4); | |
b5bdacf3 | 647 | int rc; |
8cbb512c DA |
648 | |
649 | if (unlikely(!fl4->daddr)) | |
b5bdacf3 | 650 | return 0; |
8cbb512c DA |
651 | |
652 | fl4->flowi4_flags |= FLOWI_FLAG_SKIP_NH_OIF; | |
653 | fl4->flowi4_iif = LOOPBACK_IFINDEX; | |
1ff23bee DA |
654 | /* make sure oif is set to VRF device for lookup */ |
655 | fl4->flowi4_oif = dev->ifindex; | |
8cbb512c DA |
656 | fl4->flowi4_tos = tos & IPTOS_RT_MASK; |
657 | fl4->flowi4_scope = ((tos & RTO_ONLINK) ? | |
658 | RT_SCOPE_LINK : RT_SCOPE_UNIVERSE); | |
659 | ||
b5bdacf3 DA |
660 | rc = fib_lookup(net, fl4, &res, 0); |
661 | if (!rc) { | |
8cbb512c DA |
662 | if (res.type == RTN_LOCAL) |
663 | fl4->saddr = res.fi->fib_prefsrc ? : fl4->daddr; | |
664 | else | |
665 | fib_select_path(net, &res, fl4, -1); | |
666 | } | |
667 | ||
668 | fl4->flowi4_flags = flags; | |
669 | fl4->flowi4_tos = orig_tos; | |
670 | fl4->flowi4_scope = scope; | |
b5bdacf3 DA |
671 | |
672 | return rc; | |
8cbb512c DA |
673 | } |
674 | ||
74b20582 DA |
675 | #if IS_ENABLED(CONFIG_IPV6) |
676 | /* neighbor handling is done with actual device; do not want | |
677 | * to flip skb->dev for those ndisc packets. This really fails | |
678 | * for multiple next protocols (e.g., NEXTHDR_HOP). But it is | |
679 | * a start. | |
680 | */ | |
681 | static bool ipv6_ndisc_frame(const struct sk_buff *skb) | |
682 | { | |
683 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
684 | bool rc = false; | |
685 | ||
686 | if (iph->nexthdr == NEXTHDR_ICMP) { | |
687 | const struct icmp6hdr *icmph; | |
688 | struct icmp6hdr _icmph; | |
689 | ||
690 | icmph = skb_header_pointer(skb, sizeof(*iph), | |
691 | sizeof(_icmph), &_icmph); | |
692 | if (!icmph) | |
693 | goto out; | |
694 | ||
695 | switch (icmph->icmp6_type) { | |
696 | case NDISC_ROUTER_SOLICITATION: | |
697 | case NDISC_ROUTER_ADVERTISEMENT: | |
698 | case NDISC_NEIGHBOUR_SOLICITATION: | |
699 | case NDISC_NEIGHBOUR_ADVERTISEMENT: | |
700 | case NDISC_REDIRECT: | |
701 | rc = true; | |
702 | break; | |
703 | } | |
704 | } | |
705 | ||
706 | out: | |
707 | return rc; | |
708 | } | |
709 | ||
710 | static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev, | |
711 | struct sk_buff *skb) | |
712 | { | |
713 | /* if packet is NDISC keep the ingress interface */ | |
714 | if (!ipv6_ndisc_frame(skb)) { | |
715 | skb->dev = vrf_dev; | |
716 | skb->skb_iif = vrf_dev->ifindex; | |
717 | ||
718 | skb_push(skb, skb->mac_len); | |
719 | dev_queue_xmit_nit(skb, vrf_dev); | |
720 | skb_pull(skb, skb->mac_len); | |
721 | ||
722 | IP6CB(skb)->flags |= IP6SKB_L3SLAVE; | |
723 | } | |
724 | ||
725 | return skb; | |
726 | } | |
727 | ||
728 | #else | |
729 | static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev, | |
730 | struct sk_buff *skb) | |
731 | { | |
732 | return skb; | |
733 | } | |
734 | #endif | |
735 | ||
736 | static struct sk_buff *vrf_ip_rcv(struct net_device *vrf_dev, | |
737 | struct sk_buff *skb) | |
738 | { | |
739 | skb->dev = vrf_dev; | |
740 | skb->skb_iif = vrf_dev->ifindex; | |
741 | ||
afe80a49 DA |
742 | /* loopback traffic; do not push through packet taps again. |
743 | * Reset pkt_type for upper layers to process skb | |
744 | */ | |
745 | if (skb->pkt_type == PACKET_LOOPBACK) { | |
746 | skb->pkt_type = PACKET_HOST; | |
747 | goto out; | |
748 | } | |
749 | ||
74b20582 DA |
750 | skb_push(skb, skb->mac_len); |
751 | dev_queue_xmit_nit(skb, vrf_dev); | |
752 | skb_pull(skb, skb->mac_len); | |
753 | ||
afe80a49 | 754 | out: |
74b20582 DA |
755 | return skb; |
756 | } | |
757 | ||
758 | /* called with rcu lock held */ | |
759 | static struct sk_buff *vrf_l3_rcv(struct net_device *vrf_dev, | |
760 | struct sk_buff *skb, | |
761 | u16 proto) | |
762 | { | |
763 | switch (proto) { | |
764 | case AF_INET: | |
765 | return vrf_ip_rcv(vrf_dev, skb); | |
766 | case AF_INET6: | |
767 | return vrf_ip6_rcv(vrf_dev, skb); | |
768 | } | |
769 | ||
770 | return skb; | |
771 | } | |
772 | ||
35402e31 DA |
773 | #if IS_ENABLED(CONFIG_IPV6) |
774 | static struct dst_entry *vrf_get_rt6_dst(const struct net_device *dev, | |
775 | const struct flowi6 *fl6) | |
776 | { | |
b0e95ccd | 777 | struct dst_entry *dst = NULL; |
35402e31 DA |
778 | |
779 | if (!(fl6->flowi6_flags & FLOWI_FLAG_L3MDEV_SRC)) { | |
780 | struct net_vrf *vrf = netdev_priv(dev); | |
b0e95ccd DA |
781 | struct rt6_info *rt; |
782 | ||
783 | rcu_read_lock(); | |
784 | ||
785 | rt = rcu_dereference(vrf->rt6); | |
786 | if (likely(rt)) { | |
787 | dst = &rt->dst; | |
788 | dst_hold(dst); | |
789 | } | |
35402e31 | 790 | |
b0e95ccd | 791 | rcu_read_unlock(); |
35402e31 DA |
792 | } |
793 | ||
b0e95ccd | 794 | return dst; |
35402e31 DA |
795 | } |
796 | #endif | |
797 | ||
ee15ee5d DA |
798 | static const struct l3mdev_ops vrf_l3mdev_ops = { |
799 | .l3mdev_fib_table = vrf_fib_table, | |
800 | .l3mdev_get_rtable = vrf_get_rtable, | |
8cbb512c | 801 | .l3mdev_get_saddr = vrf_get_saddr, |
74b20582 | 802 | .l3mdev_l3_rcv = vrf_l3_rcv, |
35402e31 DA |
803 | #if IS_ENABLED(CONFIG_IPV6) |
804 | .l3mdev_get_rt6_dst = vrf_get_rt6_dst, | |
805 | #endif | |
ee15ee5d DA |
806 | }; |
807 | ||
193125db DA |
808 | static void vrf_get_drvinfo(struct net_device *dev, |
809 | struct ethtool_drvinfo *info) | |
810 | { | |
811 | strlcpy(info->driver, DRV_NAME, sizeof(info->driver)); | |
812 | strlcpy(info->version, DRV_VERSION, sizeof(info->version)); | |
813 | } | |
814 | ||
815 | static const struct ethtool_ops vrf_ethtool_ops = { | |
816 | .get_drvinfo = vrf_get_drvinfo, | |
817 | }; | |
818 | ||
819 | static void vrf_setup(struct net_device *dev) | |
820 | { | |
821 | ether_setup(dev); | |
822 | ||
823 | /* Initialize the device structure. */ | |
824 | dev->netdev_ops = &vrf_netdev_ops; | |
ee15ee5d | 825 | dev->l3mdev_ops = &vrf_l3mdev_ops; |
193125db DA |
826 | dev->ethtool_ops = &vrf_ethtool_ops; |
827 | dev->destructor = free_netdev; | |
828 | ||
829 | /* Fill in device structure with ethernet-generic values. */ | |
830 | eth_hw_addr_random(dev); | |
831 | ||
832 | /* don't acquire vrf device's netif_tx_lock when transmitting */ | |
833 | dev->features |= NETIF_F_LLTX; | |
834 | ||
835 | /* don't allow vrf devices to change network namespaces. */ | |
836 | dev->features |= NETIF_F_NETNS_LOCAL; | |
837 | } | |
838 | ||
839 | static int vrf_validate(struct nlattr *tb[], struct nlattr *data[]) | |
840 | { | |
841 | if (tb[IFLA_ADDRESS]) { | |
842 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) | |
843 | return -EINVAL; | |
844 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) | |
845 | return -EADDRNOTAVAIL; | |
846 | } | |
847 | return 0; | |
848 | } | |
849 | ||
850 | static void vrf_dellink(struct net_device *dev, struct list_head *head) | |
851 | { | |
193125db DA |
852 | unregister_netdevice_queue(dev, head); |
853 | } | |
854 | ||
855 | static int vrf_newlink(struct net *src_net, struct net_device *dev, | |
856 | struct nlattr *tb[], struct nlattr *data[]) | |
857 | { | |
858 | struct net_vrf *vrf = netdev_priv(dev); | |
193125db DA |
859 | |
860 | if (!data || !data[IFLA_VRF_TABLE]) | |
861 | return -EINVAL; | |
862 | ||
863 | vrf->tb_id = nla_get_u32(data[IFLA_VRF_TABLE]); | |
864 | ||
007979ea | 865 | dev->priv_flags |= IFF_L3MDEV_MASTER; |
193125db | 866 | |
7f109f7c | 867 | return register_netdevice(dev); |
193125db DA |
868 | } |
869 | ||
870 | static size_t vrf_nl_getsize(const struct net_device *dev) | |
871 | { | |
872 | return nla_total_size(sizeof(u32)); /* IFLA_VRF_TABLE */ | |
873 | } | |
874 | ||
875 | static int vrf_fillinfo(struct sk_buff *skb, | |
876 | const struct net_device *dev) | |
877 | { | |
878 | struct net_vrf *vrf = netdev_priv(dev); | |
879 | ||
880 | return nla_put_u32(skb, IFLA_VRF_TABLE, vrf->tb_id); | |
881 | } | |
882 | ||
67eb0331 DA |
883 | static size_t vrf_get_slave_size(const struct net_device *bond_dev, |
884 | const struct net_device *slave_dev) | |
885 | { | |
886 | return nla_total_size(sizeof(u32)); /* IFLA_VRF_PORT_TABLE */ | |
887 | } | |
888 | ||
889 | static int vrf_fill_slave_info(struct sk_buff *skb, | |
890 | const struct net_device *vrf_dev, | |
891 | const struct net_device *slave_dev) | |
892 | { | |
893 | struct net_vrf *vrf = netdev_priv(vrf_dev); | |
894 | ||
895 | if (nla_put_u32(skb, IFLA_VRF_PORT_TABLE, vrf->tb_id)) | |
896 | return -EMSGSIZE; | |
897 | ||
898 | return 0; | |
899 | } | |
900 | ||
193125db DA |
901 | static const struct nla_policy vrf_nl_policy[IFLA_VRF_MAX + 1] = { |
902 | [IFLA_VRF_TABLE] = { .type = NLA_U32 }, | |
903 | }; | |
904 | ||
905 | static struct rtnl_link_ops vrf_link_ops __read_mostly = { | |
906 | .kind = DRV_NAME, | |
907 | .priv_size = sizeof(struct net_vrf), | |
908 | ||
909 | .get_size = vrf_nl_getsize, | |
910 | .policy = vrf_nl_policy, | |
911 | .validate = vrf_validate, | |
912 | .fill_info = vrf_fillinfo, | |
913 | ||
67eb0331 DA |
914 | .get_slave_size = vrf_get_slave_size, |
915 | .fill_slave_info = vrf_fill_slave_info, | |
916 | ||
193125db DA |
917 | .newlink = vrf_newlink, |
918 | .dellink = vrf_dellink, | |
919 | .setup = vrf_setup, | |
920 | .maxtype = IFLA_VRF_MAX, | |
921 | }; | |
922 | ||
923 | static int vrf_device_event(struct notifier_block *unused, | |
924 | unsigned long event, void *ptr) | |
925 | { | |
926 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
927 | ||
928 | /* only care about unregister events to drop slave references */ | |
929 | if (event == NETDEV_UNREGISTER) { | |
193125db DA |
930 | struct net_device *vrf_dev; |
931 | ||
fee6d4c7 | 932 | if (!netif_is_l3_slave(dev)) |
193125db DA |
933 | goto out; |
934 | ||
58aa9087 NA |
935 | vrf_dev = netdev_master_upper_dev_get(dev); |
936 | vrf_del_slave(vrf_dev, dev); | |
193125db DA |
937 | } |
938 | out: | |
939 | return NOTIFY_DONE; | |
940 | } | |
941 | ||
942 | static struct notifier_block vrf_notifier_block __read_mostly = { | |
943 | .notifier_call = vrf_device_event, | |
944 | }; | |
945 | ||
946 | static int __init vrf_init_module(void) | |
947 | { | |
948 | int rc; | |
949 | ||
193125db DA |
950 | register_netdevice_notifier(&vrf_notifier_block); |
951 | ||
952 | rc = rtnl_link_register(&vrf_link_ops); | |
953 | if (rc < 0) | |
954 | goto error; | |
955 | ||
956 | return 0; | |
957 | ||
958 | error: | |
959 | unregister_netdevice_notifier(&vrf_notifier_block); | |
193125db DA |
960 | return rc; |
961 | } | |
962 | ||
193125db | 963 | module_init(vrf_init_module); |
193125db DA |
964 | MODULE_AUTHOR("Shrijeet Mukherjee, David Ahern"); |
965 | MODULE_DESCRIPTION("Device driver to instantiate VRF domains"); | |
966 | MODULE_LICENSE("GPL"); | |
967 | MODULE_ALIAS_RTNL_LINK(DRV_NAME); | |
968 | MODULE_VERSION(DRV_VERSION); |