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193125db DA |
1 | /* |
2 | * vrf.c: device driver to encapsulate a VRF space | |
3 | * | |
4 | * Copyright (c) 2015 Cumulus Networks. All rights reserved. | |
5 | * Copyright (c) 2015 Shrijeet Mukherjee <shm@cumulusnetworks.com> | |
6 | * Copyright (c) 2015 David Ahern <dsa@cumulusnetworks.com> | |
7 | * | |
8 | * Based on dummy, team and ipvlan drivers | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | */ | |
15 | ||
16 | #include <linux/module.h> | |
17 | #include <linux/kernel.h> | |
18 | #include <linux/netdevice.h> | |
19 | #include <linux/etherdevice.h> | |
20 | #include <linux/ip.h> | |
21 | #include <linux/init.h> | |
22 | #include <linux/moduleparam.h> | |
23 | #include <linux/netfilter.h> | |
24 | #include <linux/rtnetlink.h> | |
25 | #include <net/rtnetlink.h> | |
26 | #include <linux/u64_stats_sync.h> | |
27 | #include <linux/hashtable.h> | |
28 | ||
29 | #include <linux/inetdevice.h> | |
8f58336d | 30 | #include <net/arp.h> |
193125db DA |
31 | #include <net/ip.h> |
32 | #include <net/ip_fib.h> | |
35402e31 | 33 | #include <net/ip6_fib.h> |
193125db DA |
34 | #include <net/ip6_route.h> |
35 | #include <net/rtnetlink.h> | |
36 | #include <net/route.h> | |
37 | #include <net/addrconf.h> | |
ee15ee5d | 38 | #include <net/l3mdev.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 | ||
193125db DA |
46 | #define vrf_master_get_rcu(dev) \ |
47 | ((struct net_device *)rcu_dereference(dev->rx_handler_data)) | |
48 | ||
ec539514 DA |
49 | struct slave { |
50 | struct list_head list; | |
51 | struct net_device *dev; | |
52 | }; | |
53 | ||
54 | struct slave_queue { | |
55 | struct list_head all_slaves; | |
56 | }; | |
57 | ||
58 | struct net_vrf { | |
59 | struct slave_queue queue; | |
60 | struct rtable *rth; | |
35402e31 | 61 | struct rt6_info *rt6; |
ec539514 DA |
62 | u32 tb_id; |
63 | }; | |
64 | ||
193125db DA |
65 | struct pcpu_dstats { |
66 | u64 tx_pkts; | |
67 | u64 tx_bytes; | |
68 | u64 tx_drps; | |
69 | u64 rx_pkts; | |
70 | u64 rx_bytes; | |
71 | struct u64_stats_sync syncp; | |
72 | }; | |
73 | ||
74 | static struct dst_entry *vrf_ip_check(struct dst_entry *dst, u32 cookie) | |
75 | { | |
76 | return dst; | |
77 | } | |
78 | ||
cf91a99d | 79 | static int vrf_ip_local_out(struct net *net, struct sock *sk, struct sk_buff *skb) |
193125db | 80 | { |
33224b16 | 81 | return ip_local_out(net, sk, skb); |
193125db DA |
82 | } |
83 | ||
84 | static unsigned int vrf_v4_mtu(const struct dst_entry *dst) | |
85 | { | |
86 | /* TO-DO: return max ethernet size? */ | |
87 | return dst->dev->mtu; | |
88 | } | |
89 | ||
90 | static void vrf_dst_destroy(struct dst_entry *dst) | |
91 | { | |
92 | /* our dst lives forever - or until the device is closed */ | |
93 | } | |
94 | ||
95 | static unsigned int vrf_default_advmss(const struct dst_entry *dst) | |
96 | { | |
97 | return 65535 - 40; | |
98 | } | |
99 | ||
100 | static struct dst_ops vrf_dst_ops = { | |
101 | .family = AF_INET, | |
102 | .local_out = vrf_ip_local_out, | |
103 | .check = vrf_ip_check, | |
104 | .mtu = vrf_v4_mtu, | |
105 | .destroy = vrf_dst_destroy, | |
106 | .default_advmss = vrf_default_advmss, | |
107 | }; | |
108 | ||
35402e31 DA |
109 | /* neighbor handling is done with actual device; do not want |
110 | * to flip skb->dev for those ndisc packets. This really fails | |
111 | * for multiple next protocols (e.g., NEXTHDR_HOP). But it is | |
112 | * a start. | |
113 | */ | |
114 | #if IS_ENABLED(CONFIG_IPV6) | |
115 | static bool check_ipv6_frame(const struct sk_buff *skb) | |
116 | { | |
117 | const struct ipv6hdr *ipv6h = (struct ipv6hdr *)skb->data; | |
118 | size_t hlen = sizeof(*ipv6h); | |
119 | bool rc = true; | |
120 | ||
121 | if (skb->len < hlen) | |
122 | goto out; | |
123 | ||
124 | if (ipv6h->nexthdr == NEXTHDR_ICMP) { | |
125 | const struct icmp6hdr *icmph; | |
126 | ||
127 | if (skb->len < hlen + sizeof(*icmph)) | |
128 | goto out; | |
129 | ||
130 | icmph = (struct icmp6hdr *)(skb->data + sizeof(*ipv6h)); | |
131 | switch (icmph->icmp6_type) { | |
132 | case NDISC_ROUTER_SOLICITATION: | |
133 | case NDISC_ROUTER_ADVERTISEMENT: | |
134 | case NDISC_NEIGHBOUR_SOLICITATION: | |
135 | case NDISC_NEIGHBOUR_ADVERTISEMENT: | |
136 | case NDISC_REDIRECT: | |
137 | rc = false; | |
138 | break; | |
139 | } | |
140 | } | |
141 | ||
142 | out: | |
143 | return rc; | |
144 | } | |
145 | #else | |
146 | static bool check_ipv6_frame(const struct sk_buff *skb) | |
147 | { | |
148 | return false; | |
149 | } | |
150 | #endif | |
151 | ||
193125db DA |
152 | static bool is_ip_rx_frame(struct sk_buff *skb) |
153 | { | |
154 | switch (skb->protocol) { | |
155 | case htons(ETH_P_IP): | |
193125db | 156 | return true; |
35402e31 DA |
157 | case htons(ETH_P_IPV6): |
158 | return check_ipv6_frame(skb); | |
193125db DA |
159 | } |
160 | return false; | |
161 | } | |
162 | ||
57b8efa1 NA |
163 | static void vrf_tx_error(struct net_device *vrf_dev, struct sk_buff *skb) |
164 | { | |
165 | vrf_dev->stats.tx_errors++; | |
166 | kfree_skb(skb); | |
167 | } | |
168 | ||
193125db DA |
169 | /* note: already called with rcu_read_lock */ |
170 | static rx_handler_result_t vrf_handle_frame(struct sk_buff **pskb) | |
171 | { | |
172 | struct sk_buff *skb = *pskb; | |
173 | ||
174 | if (is_ip_rx_frame(skb)) { | |
175 | struct net_device *dev = vrf_master_get_rcu(skb->dev); | |
176 | struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats); | |
177 | ||
178 | u64_stats_update_begin(&dstats->syncp); | |
179 | dstats->rx_pkts++; | |
180 | dstats->rx_bytes += skb->len; | |
181 | u64_stats_update_end(&dstats->syncp); | |
182 | ||
183 | skb->dev = dev; | |
184 | ||
185 | return RX_HANDLER_ANOTHER; | |
186 | } | |
187 | return RX_HANDLER_PASS; | |
188 | } | |
189 | ||
190 | static struct rtnl_link_stats64 *vrf_get_stats64(struct net_device *dev, | |
191 | struct rtnl_link_stats64 *stats) | |
192 | { | |
193 | int i; | |
194 | ||
195 | for_each_possible_cpu(i) { | |
196 | const struct pcpu_dstats *dstats; | |
197 | u64 tbytes, tpkts, tdrops, rbytes, rpkts; | |
198 | unsigned int start; | |
199 | ||
200 | dstats = per_cpu_ptr(dev->dstats, i); | |
201 | do { | |
202 | start = u64_stats_fetch_begin_irq(&dstats->syncp); | |
203 | tbytes = dstats->tx_bytes; | |
204 | tpkts = dstats->tx_pkts; | |
205 | tdrops = dstats->tx_drps; | |
206 | rbytes = dstats->rx_bytes; | |
207 | rpkts = dstats->rx_pkts; | |
208 | } while (u64_stats_fetch_retry_irq(&dstats->syncp, start)); | |
209 | stats->tx_bytes += tbytes; | |
210 | stats->tx_packets += tpkts; | |
211 | stats->tx_dropped += tdrops; | |
212 | stats->rx_bytes += rbytes; | |
213 | stats->rx_packets += rpkts; | |
214 | } | |
215 | return stats; | |
216 | } | |
217 | ||
35402e31 DA |
218 | #if IS_ENABLED(CONFIG_IPV6) |
219 | static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb, | |
220 | struct net_device *dev) | |
221 | { | |
222 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
223 | struct net *net = dev_net(skb->dev); | |
224 | struct flowi6 fl6 = { | |
225 | /* needed to match OIF rule */ | |
226 | .flowi6_oif = dev->ifindex, | |
227 | .flowi6_iif = LOOPBACK_IFINDEX, | |
228 | .daddr = iph->daddr, | |
229 | .saddr = iph->saddr, | |
230 | .flowlabel = ip6_flowinfo(iph), | |
231 | .flowi6_mark = skb->mark, | |
232 | .flowi6_proto = iph->nexthdr, | |
233 | .flowi6_flags = FLOWI_FLAG_L3MDEV_SRC | FLOWI_FLAG_SKIP_NH_OIF, | |
234 | }; | |
235 | int ret = NET_XMIT_DROP; | |
236 | struct dst_entry *dst; | |
237 | struct dst_entry *dst_null = &net->ipv6.ip6_null_entry->dst; | |
238 | ||
239 | dst = ip6_route_output(net, NULL, &fl6); | |
240 | if (dst == dst_null) | |
241 | goto err; | |
242 | ||
243 | skb_dst_drop(skb); | |
244 | skb_dst_set(skb, dst); | |
245 | ||
246 | ret = ip6_local_out(net, skb->sk, skb); | |
247 | if (unlikely(net_xmit_eval(ret))) | |
248 | dev->stats.tx_errors++; | |
249 | else | |
250 | ret = NET_XMIT_SUCCESS; | |
251 | ||
252 | return ret; | |
253 | err: | |
254 | vrf_tx_error(dev, skb); | |
255 | return NET_XMIT_DROP; | |
256 | } | |
257 | #else | |
193125db DA |
258 | static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb, |
259 | struct net_device *dev) | |
260 | { | |
57b8efa1 NA |
261 | vrf_tx_error(dev, skb); |
262 | return NET_XMIT_DROP; | |
193125db | 263 | } |
35402e31 | 264 | #endif |
193125db DA |
265 | |
266 | static int vrf_send_v4_prep(struct sk_buff *skb, struct flowi4 *fl4, | |
267 | struct net_device *vrf_dev) | |
268 | { | |
269 | struct rtable *rt; | |
270 | int err = 1; | |
271 | ||
272 | rt = ip_route_output_flow(dev_net(vrf_dev), fl4, NULL); | |
273 | if (IS_ERR(rt)) | |
274 | goto out; | |
275 | ||
276 | /* TO-DO: what about broadcast ? */ | |
277 | if (rt->rt_type != RTN_UNICAST && rt->rt_type != RTN_LOCAL) { | |
278 | ip_rt_put(rt); | |
279 | goto out; | |
280 | } | |
281 | ||
282 | skb_dst_drop(skb); | |
283 | skb_dst_set(skb, &rt->dst); | |
284 | err = 0; | |
285 | out: | |
286 | return err; | |
287 | } | |
288 | ||
289 | static netdev_tx_t vrf_process_v4_outbound(struct sk_buff *skb, | |
290 | struct net_device *vrf_dev) | |
291 | { | |
292 | struct iphdr *ip4h = ip_hdr(skb); | |
293 | int ret = NET_XMIT_DROP; | |
294 | struct flowi4 fl4 = { | |
295 | /* needed to match OIF rule */ | |
296 | .flowi4_oif = vrf_dev->ifindex, | |
297 | .flowi4_iif = LOOPBACK_IFINDEX, | |
298 | .flowi4_tos = RT_TOS(ip4h->tos), | |
6e2895a8 | 299 | .flowi4_flags = FLOWI_FLAG_ANYSRC | FLOWI_FLAG_L3MDEV_SRC | |
58189ca7 | 300 | FLOWI_FLAG_SKIP_NH_OIF, |
193125db DA |
301 | .daddr = ip4h->daddr, |
302 | }; | |
303 | ||
304 | if (vrf_send_v4_prep(skb, &fl4, vrf_dev)) | |
305 | goto err; | |
306 | ||
307 | if (!ip4h->saddr) { | |
308 | ip4h->saddr = inet_select_addr(skb_dst(skb)->dev, 0, | |
309 | RT_SCOPE_LINK); | |
310 | } | |
311 | ||
33224b16 | 312 | ret = ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb); |
193125db DA |
313 | if (unlikely(net_xmit_eval(ret))) |
314 | vrf_dev->stats.tx_errors++; | |
315 | else | |
316 | ret = NET_XMIT_SUCCESS; | |
317 | ||
318 | out: | |
319 | return ret; | |
320 | err: | |
57b8efa1 | 321 | vrf_tx_error(vrf_dev, skb); |
193125db DA |
322 | goto out; |
323 | } | |
324 | ||
325 | static netdev_tx_t is_ip_tx_frame(struct sk_buff *skb, struct net_device *dev) | |
326 | { | |
8f58336d DA |
327 | /* strip the ethernet header added for pass through VRF device */ |
328 | __skb_pull(skb, skb_network_offset(skb)); | |
329 | ||
193125db DA |
330 | switch (skb->protocol) { |
331 | case htons(ETH_P_IP): | |
332 | return vrf_process_v4_outbound(skb, dev); | |
333 | case htons(ETH_P_IPV6): | |
334 | return vrf_process_v6_outbound(skb, dev); | |
335 | default: | |
57b8efa1 | 336 | vrf_tx_error(dev, skb); |
193125db DA |
337 | return NET_XMIT_DROP; |
338 | } | |
339 | } | |
340 | ||
341 | static netdev_tx_t vrf_xmit(struct sk_buff *skb, struct net_device *dev) | |
342 | { | |
343 | netdev_tx_t ret = is_ip_tx_frame(skb, dev); | |
344 | ||
345 | if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { | |
346 | struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats); | |
347 | ||
348 | u64_stats_update_begin(&dstats->syncp); | |
349 | dstats->tx_pkts++; | |
350 | dstats->tx_bytes += skb->len; | |
351 | u64_stats_update_end(&dstats->syncp); | |
352 | } else { | |
353 | this_cpu_inc(dev->dstats->tx_drps); | |
354 | } | |
355 | ||
356 | return ret; | |
357 | } | |
358 | ||
35402e31 DA |
359 | #if IS_ENABLED(CONFIG_IPV6) |
360 | static struct dst_entry *vrf_ip6_check(struct dst_entry *dst, u32 cookie) | |
361 | { | |
362 | return dst; | |
363 | } | |
364 | ||
365 | static struct dst_ops vrf_dst_ops6 = { | |
366 | .family = AF_INET6, | |
367 | .local_out = ip6_local_out, | |
368 | .check = vrf_ip6_check, | |
369 | .mtu = vrf_v4_mtu, | |
370 | .destroy = vrf_dst_destroy, | |
371 | .default_advmss = vrf_default_advmss, | |
372 | }; | |
373 | ||
374 | static int init_dst_ops6_kmem_cachep(void) | |
375 | { | |
376 | vrf_dst_ops6.kmem_cachep = kmem_cache_create("vrf_ip6_dst_cache", | |
377 | sizeof(struct rt6_info), | |
378 | 0, | |
379 | SLAB_HWCACHE_ALIGN, | |
380 | NULL); | |
381 | ||
382 | if (!vrf_dst_ops6.kmem_cachep) | |
383 | return -ENOMEM; | |
384 | ||
385 | return 0; | |
386 | } | |
387 | ||
388 | static void free_dst_ops6_kmem_cachep(void) | |
389 | { | |
390 | kmem_cache_destroy(vrf_dst_ops6.kmem_cachep); | |
391 | } | |
392 | ||
393 | static int vrf_input6(struct sk_buff *skb) | |
394 | { | |
395 | skb->dev->stats.rx_errors++; | |
396 | kfree_skb(skb); | |
397 | return 0; | |
398 | } | |
399 | ||
400 | /* modelled after ip6_finish_output2 */ | |
401 | static int vrf_finish_output6(struct net *net, struct sock *sk, | |
402 | struct sk_buff *skb) | |
403 | { | |
404 | struct dst_entry *dst = skb_dst(skb); | |
405 | struct net_device *dev = dst->dev; | |
406 | struct neighbour *neigh; | |
407 | struct in6_addr *nexthop; | |
408 | int ret; | |
409 | ||
410 | skb->protocol = htons(ETH_P_IPV6); | |
411 | skb->dev = dev; | |
412 | ||
413 | rcu_read_lock_bh(); | |
414 | nexthop = rt6_nexthop((struct rt6_info *)dst, &ipv6_hdr(skb)->daddr); | |
415 | neigh = __ipv6_neigh_lookup_noref(dst->dev, nexthop); | |
416 | if (unlikely(!neigh)) | |
417 | neigh = __neigh_create(&nd_tbl, nexthop, dst->dev, false); | |
418 | if (!IS_ERR(neigh)) { | |
419 | ret = dst_neigh_output(dst, neigh, skb); | |
420 | rcu_read_unlock_bh(); | |
421 | return ret; | |
422 | } | |
423 | rcu_read_unlock_bh(); | |
424 | ||
425 | IP6_INC_STATS(dev_net(dst->dev), | |
426 | ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES); | |
427 | kfree_skb(skb); | |
428 | return -EINVAL; | |
429 | } | |
430 | ||
431 | /* modelled after ip6_output */ | |
432 | static int vrf_output6(struct net *net, struct sock *sk, struct sk_buff *skb) | |
433 | { | |
434 | return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING, | |
435 | net, sk, skb, NULL, skb_dst(skb)->dev, | |
436 | vrf_finish_output6, | |
437 | !(IP6CB(skb)->flags & IP6SKB_REROUTED)); | |
438 | } | |
439 | ||
440 | static void vrf_rt6_destroy(struct net_vrf *vrf) | |
441 | { | |
442 | dst_destroy(&vrf->rt6->dst); | |
443 | free_percpu(vrf->rt6->rt6i_pcpu); | |
444 | vrf->rt6 = NULL; | |
445 | } | |
446 | ||
447 | static int vrf_rt6_create(struct net_device *dev) | |
448 | { | |
449 | struct net_vrf *vrf = netdev_priv(dev); | |
450 | struct dst_entry *dst; | |
451 | struct rt6_info *rt6; | |
452 | int cpu; | |
453 | int rc = -ENOMEM; | |
454 | ||
455 | rt6 = dst_alloc(&vrf_dst_ops6, dev, 0, | |
456 | DST_OBSOLETE_NONE, | |
457 | (DST_HOST | DST_NOPOLICY | DST_NOXFRM)); | |
458 | if (!rt6) | |
459 | goto out; | |
460 | ||
461 | dst = &rt6->dst; | |
462 | ||
463 | rt6->rt6i_pcpu = alloc_percpu_gfp(struct rt6_info *, GFP_KERNEL); | |
464 | if (!rt6->rt6i_pcpu) { | |
465 | dst_destroy(dst); | |
466 | goto out; | |
467 | } | |
468 | for_each_possible_cpu(cpu) { | |
469 | struct rt6_info **p = per_cpu_ptr(rt6->rt6i_pcpu, cpu); | |
470 | *p = NULL; | |
471 | } | |
472 | ||
473 | memset(dst + 1, 0, sizeof(*rt6) - sizeof(*dst)); | |
474 | ||
475 | INIT_LIST_HEAD(&rt6->rt6i_siblings); | |
476 | INIT_LIST_HEAD(&rt6->rt6i_uncached); | |
477 | ||
478 | rt6->dst.input = vrf_input6; | |
479 | rt6->dst.output = vrf_output6; | |
480 | ||
481 | rt6->rt6i_table = fib6_get_table(dev_net(dev), vrf->tb_id); | |
482 | ||
483 | atomic_set(&rt6->dst.__refcnt, 2); | |
484 | ||
485 | vrf->rt6 = rt6; | |
486 | rc = 0; | |
487 | out: | |
488 | return rc; | |
489 | } | |
490 | #else | |
491 | static int init_dst_ops6_kmem_cachep(void) | |
492 | { | |
493 | return 0; | |
494 | } | |
495 | ||
496 | static void free_dst_ops6_kmem_cachep(void) | |
497 | { | |
498 | } | |
499 | ||
500 | static void vrf_rt6_destroy(struct net_vrf *vrf) | |
501 | { | |
502 | } | |
503 | ||
504 | static int vrf_rt6_create(struct net_device *dev) | |
505 | { | |
506 | return 0; | |
507 | } | |
508 | #endif | |
509 | ||
8f58336d | 510 | /* modelled after ip_finish_output2 */ |
0c4b51f0 | 511 | static int vrf_finish_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
193125db | 512 | { |
8f58336d DA |
513 | struct dst_entry *dst = skb_dst(skb); |
514 | struct rtable *rt = (struct rtable *)dst; | |
515 | struct net_device *dev = dst->dev; | |
516 | unsigned int hh_len = LL_RESERVED_SPACE(dev); | |
517 | struct neighbour *neigh; | |
518 | u32 nexthop; | |
519 | int ret = -EINVAL; | |
520 | ||
521 | /* Be paranoid, rather than too clever. */ | |
522 | if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) { | |
523 | struct sk_buff *skb2; | |
524 | ||
525 | skb2 = skb_realloc_headroom(skb, LL_RESERVED_SPACE(dev)); | |
526 | if (!skb2) { | |
527 | ret = -ENOMEM; | |
528 | goto err; | |
529 | } | |
530 | if (skb->sk) | |
531 | skb_set_owner_w(skb2, skb->sk); | |
532 | ||
533 | consume_skb(skb); | |
534 | skb = skb2; | |
535 | } | |
536 | ||
537 | rcu_read_lock_bh(); | |
538 | ||
539 | nexthop = (__force u32)rt_nexthop(rt, ip_hdr(skb)->daddr); | |
540 | neigh = __ipv4_neigh_lookup_noref(dev, nexthop); | |
541 | if (unlikely(!neigh)) | |
542 | neigh = __neigh_create(&arp_tbl, &nexthop, dev, false); | |
543 | if (!IS_ERR(neigh)) | |
544 | ret = dst_neigh_output(dst, neigh, skb); | |
545 | ||
546 | rcu_read_unlock_bh(); | |
547 | err: | |
548 | if (unlikely(ret < 0)) | |
549 | vrf_tx_error(skb->dev, skb); | |
550 | return ret; | |
193125db DA |
551 | } |
552 | ||
ede2059d | 553 | static int vrf_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
193125db DA |
554 | { |
555 | struct net_device *dev = skb_dst(skb)->dev; | |
556 | ||
29a26a56 | 557 | IP_UPD_PO_STATS(net, IPSTATS_MIB_OUT, skb->len); |
193125db DA |
558 | |
559 | skb->dev = dev; | |
560 | skb->protocol = htons(ETH_P_IP); | |
561 | ||
29a26a56 EB |
562 | return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING, |
563 | net, sk, skb, NULL, dev, | |
8f58336d | 564 | vrf_finish_output, |
193125db DA |
565 | !(IPCB(skb)->flags & IPSKB_REROUTED)); |
566 | } | |
567 | ||
568 | static void vrf_rtable_destroy(struct net_vrf *vrf) | |
569 | { | |
570 | struct dst_entry *dst = (struct dst_entry *)vrf->rth; | |
571 | ||
3a4a27d3 | 572 | dst_destroy(dst); |
193125db DA |
573 | vrf->rth = NULL; |
574 | } | |
575 | ||
576 | static struct rtable *vrf_rtable_create(struct net_device *dev) | |
577 | { | |
b7503e0c | 578 | struct net_vrf *vrf = netdev_priv(dev); |
193125db DA |
579 | struct rtable *rth; |
580 | ||
581 | rth = dst_alloc(&vrf_dst_ops, dev, 2, | |
582 | DST_OBSOLETE_NONE, | |
583 | (DST_HOST | DST_NOPOLICY | DST_NOXFRM)); | |
584 | if (rth) { | |
585 | rth->dst.output = vrf_output; | |
586 | rth->rt_genid = rt_genid_ipv4(dev_net(dev)); | |
587 | rth->rt_flags = 0; | |
588 | rth->rt_type = RTN_UNICAST; | |
589 | rth->rt_is_input = 0; | |
590 | rth->rt_iif = 0; | |
591 | rth->rt_pmtu = 0; | |
592 | rth->rt_gateway = 0; | |
593 | rth->rt_uses_gateway = 0; | |
b7503e0c | 594 | rth->rt_table_id = vrf->tb_id; |
193125db DA |
595 | INIT_LIST_HEAD(&rth->rt_uncached); |
596 | rth->rt_uncached_list = NULL; | |
193125db DA |
597 | } |
598 | ||
599 | return rth; | |
600 | } | |
601 | ||
602 | /**************************** device handling ********************/ | |
603 | ||
604 | /* cycle interface to flush neighbor cache and move routes across tables */ | |
605 | static void cycle_netdev(struct net_device *dev) | |
606 | { | |
607 | unsigned int flags = dev->flags; | |
608 | int ret; | |
609 | ||
610 | if (!netif_running(dev)) | |
611 | return; | |
612 | ||
613 | ret = dev_change_flags(dev, flags & ~IFF_UP); | |
614 | if (ret >= 0) | |
615 | ret = dev_change_flags(dev, flags); | |
616 | ||
617 | if (ret < 0) { | |
618 | netdev_err(dev, | |
619 | "Failed to cycle device %s; route tables might be wrong!\n", | |
620 | dev->name); | |
621 | } | |
622 | } | |
623 | ||
624 | static struct slave *__vrf_find_slave_dev(struct slave_queue *queue, | |
625 | struct net_device *dev) | |
626 | { | |
627 | struct list_head *head = &queue->all_slaves; | |
628 | struct slave *slave; | |
629 | ||
630 | list_for_each_entry(slave, head, list) { | |
631 | if (slave->dev == dev) | |
632 | return slave; | |
633 | } | |
634 | ||
635 | return NULL; | |
636 | } | |
637 | ||
638 | /* inverse of __vrf_insert_slave */ | |
639 | static void __vrf_remove_slave(struct slave_queue *queue, struct slave *slave) | |
640 | { | |
193125db | 641 | list_del(&slave->list); |
193125db DA |
642 | } |
643 | ||
644 | static void __vrf_insert_slave(struct slave_queue *queue, struct slave *slave) | |
645 | { | |
193125db | 646 | list_add(&slave->list, &queue->all_slaves); |
193125db DA |
647 | } |
648 | ||
649 | static int do_vrf_add_slave(struct net_device *dev, struct net_device *port_dev) | |
650 | { | |
193125db | 651 | struct slave *slave = kzalloc(sizeof(*slave), GFP_KERNEL); |
193125db DA |
652 | struct net_vrf *vrf = netdev_priv(dev); |
653 | struct slave_queue *queue = &vrf->queue; | |
654 | int ret = -ENOMEM; | |
655 | ||
93a7e7e8 | 656 | if (!slave) |
193125db DA |
657 | goto out_fail; |
658 | ||
659 | slave->dev = port_dev; | |
193125db | 660 | |
193125db DA |
661 | /* register the packet handler for slave ports */ |
662 | ret = netdev_rx_handler_register(port_dev, vrf_handle_frame, dev); | |
663 | if (ret) { | |
664 | netdev_err(port_dev, | |
665 | "Device %s failed to register rx_handler\n", | |
666 | port_dev->name); | |
15df5e71 | 667 | goto out_fail; |
193125db DA |
668 | } |
669 | ||
670 | ret = netdev_master_upper_dev_link(port_dev, dev); | |
671 | if (ret < 0) | |
672 | goto out_unregister; | |
673 | ||
fee6d4c7 | 674 | port_dev->priv_flags |= IFF_L3MDEV_SLAVE; |
15df5e71 | 675 | __vrf_insert_slave(queue, slave); |
193125db DA |
676 | cycle_netdev(port_dev); |
677 | ||
678 | return 0; | |
679 | ||
680 | out_unregister: | |
681 | netdev_rx_handler_unregister(port_dev); | |
193125db | 682 | out_fail: |
193125db DA |
683 | kfree(slave); |
684 | return ret; | |
685 | } | |
686 | ||
687 | static int vrf_add_slave(struct net_device *dev, struct net_device *port_dev) | |
688 | { | |
fee6d4c7 | 689 | if (netif_is_l3_master(port_dev) || netif_is_l3_slave(port_dev)) |
193125db DA |
690 | return -EINVAL; |
691 | ||
692 | return do_vrf_add_slave(dev, port_dev); | |
693 | } | |
694 | ||
695 | /* inverse of do_vrf_add_slave */ | |
696 | static int do_vrf_del_slave(struct net_device *dev, struct net_device *port_dev) | |
697 | { | |
193125db DA |
698 | struct net_vrf *vrf = netdev_priv(dev); |
699 | struct slave_queue *queue = &vrf->queue; | |
700 | struct slave *slave; | |
701 | ||
193125db | 702 | netdev_upper_dev_unlink(port_dev, dev); |
fee6d4c7 | 703 | port_dev->priv_flags &= ~IFF_L3MDEV_SLAVE; |
193125db DA |
704 | |
705 | netdev_rx_handler_unregister(port_dev); | |
706 | ||
193125db DA |
707 | cycle_netdev(port_dev); |
708 | ||
709 | slave = __vrf_find_slave_dev(queue, port_dev); | |
710 | if (slave) | |
711 | __vrf_remove_slave(queue, slave); | |
712 | ||
713 | kfree(slave); | |
714 | ||
715 | return 0; | |
716 | } | |
717 | ||
718 | static int vrf_del_slave(struct net_device *dev, struct net_device *port_dev) | |
719 | { | |
193125db DA |
720 | return do_vrf_del_slave(dev, port_dev); |
721 | } | |
722 | ||
723 | static void vrf_dev_uninit(struct net_device *dev) | |
724 | { | |
725 | struct net_vrf *vrf = netdev_priv(dev); | |
726 | struct slave_queue *queue = &vrf->queue; | |
727 | struct list_head *head = &queue->all_slaves; | |
728 | struct slave *slave, *next; | |
729 | ||
730 | vrf_rtable_destroy(vrf); | |
35402e31 | 731 | vrf_rt6_destroy(vrf); |
193125db DA |
732 | |
733 | list_for_each_entry_safe(slave, next, head, list) | |
734 | vrf_del_slave(dev, slave->dev); | |
735 | ||
3a4a27d3 | 736 | free_percpu(dev->dstats); |
193125db DA |
737 | dev->dstats = NULL; |
738 | } | |
739 | ||
740 | static int vrf_dev_init(struct net_device *dev) | |
741 | { | |
742 | struct net_vrf *vrf = netdev_priv(dev); | |
743 | ||
744 | INIT_LIST_HEAD(&vrf->queue.all_slaves); | |
745 | ||
746 | dev->dstats = netdev_alloc_pcpu_stats(struct pcpu_dstats); | |
747 | if (!dev->dstats) | |
748 | goto out_nomem; | |
749 | ||
750 | /* create the default dst which points back to us */ | |
751 | vrf->rth = vrf_rtable_create(dev); | |
752 | if (!vrf->rth) | |
753 | goto out_stats; | |
754 | ||
35402e31 DA |
755 | if (vrf_rt6_create(dev) != 0) |
756 | goto out_rth; | |
757 | ||
193125db DA |
758 | dev->flags = IFF_MASTER | IFF_NOARP; |
759 | ||
760 | return 0; | |
761 | ||
35402e31 DA |
762 | out_rth: |
763 | vrf_rtable_destroy(vrf); | |
193125db DA |
764 | out_stats: |
765 | free_percpu(dev->dstats); | |
766 | dev->dstats = NULL; | |
767 | out_nomem: | |
768 | return -ENOMEM; | |
769 | } | |
770 | ||
771 | static const struct net_device_ops vrf_netdev_ops = { | |
772 | .ndo_init = vrf_dev_init, | |
773 | .ndo_uninit = vrf_dev_uninit, | |
774 | .ndo_start_xmit = vrf_xmit, | |
775 | .ndo_get_stats64 = vrf_get_stats64, | |
776 | .ndo_add_slave = vrf_add_slave, | |
777 | .ndo_del_slave = vrf_del_slave, | |
778 | }; | |
779 | ||
ee15ee5d DA |
780 | static u32 vrf_fib_table(const struct net_device *dev) |
781 | { | |
782 | struct net_vrf *vrf = netdev_priv(dev); | |
783 | ||
784 | return vrf->tb_id; | |
785 | } | |
786 | ||
787 | static struct rtable *vrf_get_rtable(const struct net_device *dev, | |
788 | const struct flowi4 *fl4) | |
789 | { | |
790 | struct rtable *rth = NULL; | |
791 | ||
6e2895a8 | 792 | if (!(fl4->flowi4_flags & FLOWI_FLAG_L3MDEV_SRC)) { |
ee15ee5d DA |
793 | struct net_vrf *vrf = netdev_priv(dev); |
794 | ||
795 | rth = vrf->rth; | |
796 | atomic_inc(&rth->dst.__refcnt); | |
797 | } | |
798 | ||
799 | return rth; | |
800 | } | |
801 | ||
8cbb512c DA |
802 | /* called under rcu_read_lock */ |
803 | static void vrf_get_saddr(struct net_device *dev, struct flowi4 *fl4) | |
804 | { | |
805 | struct fib_result res = { .tclassid = 0 }; | |
806 | struct net *net = dev_net(dev); | |
807 | u32 orig_tos = fl4->flowi4_tos; | |
808 | u8 flags = fl4->flowi4_flags; | |
809 | u8 scope = fl4->flowi4_scope; | |
810 | u8 tos = RT_FL_TOS(fl4); | |
811 | ||
812 | if (unlikely(!fl4->daddr)) | |
813 | return; | |
814 | ||
815 | fl4->flowi4_flags |= FLOWI_FLAG_SKIP_NH_OIF; | |
816 | fl4->flowi4_iif = LOOPBACK_IFINDEX; | |
817 | fl4->flowi4_tos = tos & IPTOS_RT_MASK; | |
818 | fl4->flowi4_scope = ((tos & RTO_ONLINK) ? | |
819 | RT_SCOPE_LINK : RT_SCOPE_UNIVERSE); | |
820 | ||
821 | if (!fib_lookup(net, fl4, &res, 0)) { | |
822 | if (res.type == RTN_LOCAL) | |
823 | fl4->saddr = res.fi->fib_prefsrc ? : fl4->daddr; | |
824 | else | |
825 | fib_select_path(net, &res, fl4, -1); | |
826 | } | |
827 | ||
828 | fl4->flowi4_flags = flags; | |
829 | fl4->flowi4_tos = orig_tos; | |
830 | fl4->flowi4_scope = scope; | |
831 | } | |
832 | ||
35402e31 DA |
833 | #if IS_ENABLED(CONFIG_IPV6) |
834 | static struct dst_entry *vrf_get_rt6_dst(const struct net_device *dev, | |
835 | const struct flowi6 *fl6) | |
836 | { | |
837 | struct rt6_info *rt = NULL; | |
838 | ||
839 | if (!(fl6->flowi6_flags & FLOWI_FLAG_L3MDEV_SRC)) { | |
840 | struct net_vrf *vrf = netdev_priv(dev); | |
841 | ||
842 | rt = vrf->rt6; | |
843 | atomic_inc(&rt->dst.__refcnt); | |
844 | } | |
845 | ||
846 | return (struct dst_entry *)rt; | |
847 | } | |
848 | #endif | |
849 | ||
ee15ee5d DA |
850 | static const struct l3mdev_ops vrf_l3mdev_ops = { |
851 | .l3mdev_fib_table = vrf_fib_table, | |
852 | .l3mdev_get_rtable = vrf_get_rtable, | |
8cbb512c | 853 | .l3mdev_get_saddr = vrf_get_saddr, |
35402e31 DA |
854 | #if IS_ENABLED(CONFIG_IPV6) |
855 | .l3mdev_get_rt6_dst = vrf_get_rt6_dst, | |
856 | #endif | |
ee15ee5d DA |
857 | }; |
858 | ||
193125db DA |
859 | static void vrf_get_drvinfo(struct net_device *dev, |
860 | struct ethtool_drvinfo *info) | |
861 | { | |
862 | strlcpy(info->driver, DRV_NAME, sizeof(info->driver)); | |
863 | strlcpy(info->version, DRV_VERSION, sizeof(info->version)); | |
864 | } | |
865 | ||
866 | static const struct ethtool_ops vrf_ethtool_ops = { | |
867 | .get_drvinfo = vrf_get_drvinfo, | |
868 | }; | |
869 | ||
870 | static void vrf_setup(struct net_device *dev) | |
871 | { | |
872 | ether_setup(dev); | |
873 | ||
874 | /* Initialize the device structure. */ | |
875 | dev->netdev_ops = &vrf_netdev_ops; | |
ee15ee5d | 876 | dev->l3mdev_ops = &vrf_l3mdev_ops; |
193125db DA |
877 | dev->ethtool_ops = &vrf_ethtool_ops; |
878 | dev->destructor = free_netdev; | |
879 | ||
880 | /* Fill in device structure with ethernet-generic values. */ | |
881 | eth_hw_addr_random(dev); | |
882 | ||
883 | /* don't acquire vrf device's netif_tx_lock when transmitting */ | |
884 | dev->features |= NETIF_F_LLTX; | |
885 | ||
886 | /* don't allow vrf devices to change network namespaces. */ | |
887 | dev->features |= NETIF_F_NETNS_LOCAL; | |
888 | } | |
889 | ||
890 | static int vrf_validate(struct nlattr *tb[], struct nlattr *data[]) | |
891 | { | |
892 | if (tb[IFLA_ADDRESS]) { | |
893 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) | |
894 | return -EINVAL; | |
895 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) | |
896 | return -EADDRNOTAVAIL; | |
897 | } | |
898 | return 0; | |
899 | } | |
900 | ||
901 | static void vrf_dellink(struct net_device *dev, struct list_head *head) | |
902 | { | |
193125db DA |
903 | unregister_netdevice_queue(dev, head); |
904 | } | |
905 | ||
906 | static int vrf_newlink(struct net *src_net, struct net_device *dev, | |
907 | struct nlattr *tb[], struct nlattr *data[]) | |
908 | { | |
909 | struct net_vrf *vrf = netdev_priv(dev); | |
193125db DA |
910 | int err; |
911 | ||
912 | if (!data || !data[IFLA_VRF_TABLE]) | |
913 | return -EINVAL; | |
914 | ||
915 | vrf->tb_id = nla_get_u32(data[IFLA_VRF_TABLE]); | |
916 | ||
007979ea | 917 | dev->priv_flags |= IFF_L3MDEV_MASTER; |
193125db | 918 | |
193125db DA |
919 | err = register_netdevice(dev); |
920 | if (err < 0) | |
921 | goto out_fail; | |
922 | ||
193125db DA |
923 | return 0; |
924 | ||
925 | out_fail: | |
193125db DA |
926 | free_netdev(dev); |
927 | return err; | |
928 | } | |
929 | ||
930 | static size_t vrf_nl_getsize(const struct net_device *dev) | |
931 | { | |
932 | return nla_total_size(sizeof(u32)); /* IFLA_VRF_TABLE */ | |
933 | } | |
934 | ||
935 | static int vrf_fillinfo(struct sk_buff *skb, | |
936 | const struct net_device *dev) | |
937 | { | |
938 | struct net_vrf *vrf = netdev_priv(dev); | |
939 | ||
940 | return nla_put_u32(skb, IFLA_VRF_TABLE, vrf->tb_id); | |
941 | } | |
942 | ||
943 | static const struct nla_policy vrf_nl_policy[IFLA_VRF_MAX + 1] = { | |
944 | [IFLA_VRF_TABLE] = { .type = NLA_U32 }, | |
945 | }; | |
946 | ||
947 | static struct rtnl_link_ops vrf_link_ops __read_mostly = { | |
948 | .kind = DRV_NAME, | |
949 | .priv_size = sizeof(struct net_vrf), | |
950 | ||
951 | .get_size = vrf_nl_getsize, | |
952 | .policy = vrf_nl_policy, | |
953 | .validate = vrf_validate, | |
954 | .fill_info = vrf_fillinfo, | |
955 | ||
956 | .newlink = vrf_newlink, | |
957 | .dellink = vrf_dellink, | |
958 | .setup = vrf_setup, | |
959 | .maxtype = IFLA_VRF_MAX, | |
960 | }; | |
961 | ||
962 | static int vrf_device_event(struct notifier_block *unused, | |
963 | unsigned long event, void *ptr) | |
964 | { | |
965 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
966 | ||
967 | /* only care about unregister events to drop slave references */ | |
968 | if (event == NETDEV_UNREGISTER) { | |
193125db DA |
969 | struct net_device *vrf_dev; |
970 | ||
fee6d4c7 | 971 | if (!netif_is_l3_slave(dev)) |
193125db DA |
972 | goto out; |
973 | ||
58aa9087 NA |
974 | vrf_dev = netdev_master_upper_dev_get(dev); |
975 | vrf_del_slave(vrf_dev, dev); | |
193125db DA |
976 | } |
977 | out: | |
978 | return NOTIFY_DONE; | |
979 | } | |
980 | ||
981 | static struct notifier_block vrf_notifier_block __read_mostly = { | |
982 | .notifier_call = vrf_device_event, | |
983 | }; | |
984 | ||
985 | static int __init vrf_init_module(void) | |
986 | { | |
987 | int rc; | |
988 | ||
989 | vrf_dst_ops.kmem_cachep = | |
990 | kmem_cache_create("vrf_ip_dst_cache", | |
991 | sizeof(struct rtable), 0, | |
e367da02 | 992 | SLAB_HWCACHE_ALIGN, |
193125db DA |
993 | NULL); |
994 | ||
995 | if (!vrf_dst_ops.kmem_cachep) | |
996 | return -ENOMEM; | |
997 | ||
35402e31 DA |
998 | rc = init_dst_ops6_kmem_cachep(); |
999 | if (rc != 0) | |
1000 | goto error2; | |
1001 | ||
193125db DA |
1002 | register_netdevice_notifier(&vrf_notifier_block); |
1003 | ||
1004 | rc = rtnl_link_register(&vrf_link_ops); | |
1005 | if (rc < 0) | |
1006 | goto error; | |
1007 | ||
1008 | return 0; | |
1009 | ||
1010 | error: | |
1011 | unregister_netdevice_notifier(&vrf_notifier_block); | |
35402e31 DA |
1012 | free_dst_ops6_kmem_cachep(); |
1013 | error2: | |
193125db DA |
1014 | kmem_cache_destroy(vrf_dst_ops.kmem_cachep); |
1015 | return rc; | |
1016 | } | |
1017 | ||
1018 | static void __exit vrf_cleanup_module(void) | |
1019 | { | |
1020 | rtnl_link_unregister(&vrf_link_ops); | |
1021 | unregister_netdevice_notifier(&vrf_notifier_block); | |
1022 | kmem_cache_destroy(vrf_dst_ops.kmem_cachep); | |
35402e31 | 1023 | free_dst_ops6_kmem_cachep(); |
193125db DA |
1024 | } |
1025 | ||
1026 | module_init(vrf_init_module); | |
1027 | module_exit(vrf_cleanup_module); | |
1028 | MODULE_AUTHOR("Shrijeet Mukherjee, David Ahern"); | |
1029 | MODULE_DESCRIPTION("Device driver to instantiate VRF domains"); | |
1030 | MODULE_LICENSE("GPL"); | |
1031 | MODULE_ALIAS_RTNL_LINK(DRV_NAME); | |
1032 | MODULE_VERSION(DRV_VERSION); |