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Commit | Line | Data |
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193125db DA |
1 | /* |
2 | * vrf.c: device driver to encapsulate a VRF space | |
3 | * | |
4 | * Copyright (c) 2015 Cumulus Networks. All rights reserved. | |
5 | * Copyright (c) 2015 Shrijeet Mukherjee <shm@cumulusnetworks.com> | |
6 | * Copyright (c) 2015 David Ahern <dsa@cumulusnetworks.com> | |
7 | * | |
8 | * Based on dummy, team and ipvlan drivers | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | */ | |
15 | ||
16 | #include <linux/module.h> | |
17 | #include <linux/kernel.h> | |
18 | #include <linux/netdevice.h> | |
19 | #include <linux/etherdevice.h> | |
20 | #include <linux/ip.h> | |
21 | #include <linux/init.h> | |
22 | #include <linux/moduleparam.h> | |
23 | #include <linux/netfilter.h> | |
24 | #include <linux/rtnetlink.h> | |
25 | #include <net/rtnetlink.h> | |
26 | #include <linux/u64_stats_sync.h> | |
27 | #include <linux/hashtable.h> | |
28 | ||
29 | #include <linux/inetdevice.h> | |
8f58336d | 30 | #include <net/arp.h> |
193125db DA |
31 | #include <net/ip.h> |
32 | #include <net/ip_fib.h> | |
35402e31 | 33 | #include <net/ip6_fib.h> |
193125db | 34 | #include <net/ip6_route.h> |
193125db DA |
35 | #include <net/route.h> |
36 | #include <net/addrconf.h> | |
ee15ee5d | 37 | #include <net/l3mdev.h> |
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 | ||
193125db DA |
45 | #define vrf_master_get_rcu(dev) \ |
46 | ((struct net_device *)rcu_dereference(dev->rx_handler_data)) | |
47 | ||
ec539514 | 48 | struct net_vrf { |
ec539514 | 49 | struct rtable *rth; |
35402e31 | 50 | struct rt6_info *rt6; |
ec539514 DA |
51 | u32 tb_id; |
52 | }; | |
53 | ||
193125db DA |
54 | struct pcpu_dstats { |
55 | u64 tx_pkts; | |
56 | u64 tx_bytes; | |
57 | u64 tx_drps; | |
58 | u64 rx_pkts; | |
59 | u64 rx_bytes; | |
60 | struct u64_stats_sync syncp; | |
61 | }; | |
62 | ||
63 | static struct dst_entry *vrf_ip_check(struct dst_entry *dst, u32 cookie) | |
64 | { | |
65 | return dst; | |
66 | } | |
67 | ||
cf91a99d | 68 | static int vrf_ip_local_out(struct net *net, struct sock *sk, struct sk_buff *skb) |
193125db | 69 | { |
33224b16 | 70 | return ip_local_out(net, sk, skb); |
193125db DA |
71 | } |
72 | ||
73 | static unsigned int vrf_v4_mtu(const struct dst_entry *dst) | |
74 | { | |
75 | /* TO-DO: return max ethernet size? */ | |
76 | return dst->dev->mtu; | |
77 | } | |
78 | ||
79 | static void vrf_dst_destroy(struct dst_entry *dst) | |
80 | { | |
81 | /* our dst lives forever - or until the device is closed */ | |
82 | } | |
83 | ||
84 | static unsigned int vrf_default_advmss(const struct dst_entry *dst) | |
85 | { | |
86 | return 65535 - 40; | |
87 | } | |
88 | ||
89 | static struct dst_ops vrf_dst_ops = { | |
90 | .family = AF_INET, | |
91 | .local_out = vrf_ip_local_out, | |
92 | .check = vrf_ip_check, | |
93 | .mtu = vrf_v4_mtu, | |
94 | .destroy = vrf_dst_destroy, | |
95 | .default_advmss = vrf_default_advmss, | |
96 | }; | |
97 | ||
35402e31 DA |
98 | /* neighbor handling is done with actual device; do not want |
99 | * to flip skb->dev for those ndisc packets. This really fails | |
100 | * for multiple next protocols (e.g., NEXTHDR_HOP). But it is | |
101 | * a start. | |
102 | */ | |
103 | #if IS_ENABLED(CONFIG_IPV6) | |
104 | static bool check_ipv6_frame(const struct sk_buff *skb) | |
105 | { | |
65c38aa6 DA |
106 | const struct ipv6hdr *ipv6h; |
107 | struct ipv6hdr _ipv6h; | |
35402e31 DA |
108 | bool rc = true; |
109 | ||
65c38aa6 DA |
110 | ipv6h = skb_header_pointer(skb, 0, sizeof(_ipv6h), &_ipv6h); |
111 | if (!ipv6h) | |
35402e31 DA |
112 | goto out; |
113 | ||
114 | if (ipv6h->nexthdr == NEXTHDR_ICMP) { | |
115 | const struct icmp6hdr *icmph; | |
65c38aa6 | 116 | struct icmp6hdr _icmph; |
35402e31 | 117 | |
65c38aa6 DA |
118 | icmph = skb_header_pointer(skb, sizeof(_ipv6h), |
119 | sizeof(_icmph), &_icmph); | |
120 | if (!icmph) | |
35402e31 DA |
121 | goto out; |
122 | ||
35402e31 DA |
123 | switch (icmph->icmp6_type) { |
124 | case NDISC_ROUTER_SOLICITATION: | |
125 | case NDISC_ROUTER_ADVERTISEMENT: | |
126 | case NDISC_NEIGHBOUR_SOLICITATION: | |
127 | case NDISC_NEIGHBOUR_ADVERTISEMENT: | |
128 | case NDISC_REDIRECT: | |
129 | rc = false; | |
130 | break; | |
131 | } | |
132 | } | |
133 | ||
134 | out: | |
135 | return rc; | |
136 | } | |
137 | #else | |
138 | static bool check_ipv6_frame(const struct sk_buff *skb) | |
139 | { | |
140 | return false; | |
141 | } | |
142 | #endif | |
143 | ||
193125db DA |
144 | static bool is_ip_rx_frame(struct sk_buff *skb) |
145 | { | |
146 | switch (skb->protocol) { | |
147 | case htons(ETH_P_IP): | |
193125db | 148 | return true; |
35402e31 DA |
149 | case htons(ETH_P_IPV6): |
150 | return check_ipv6_frame(skb); | |
193125db DA |
151 | } |
152 | return false; | |
153 | } | |
154 | ||
57b8efa1 NA |
155 | static void vrf_tx_error(struct net_device *vrf_dev, struct sk_buff *skb) |
156 | { | |
157 | vrf_dev->stats.tx_errors++; | |
158 | kfree_skb(skb); | |
159 | } | |
160 | ||
193125db DA |
161 | /* note: already called with rcu_read_lock */ |
162 | static rx_handler_result_t vrf_handle_frame(struct sk_buff **pskb) | |
163 | { | |
164 | struct sk_buff *skb = *pskb; | |
165 | ||
166 | if (is_ip_rx_frame(skb)) { | |
167 | struct net_device *dev = vrf_master_get_rcu(skb->dev); | |
168 | struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats); | |
169 | ||
170 | u64_stats_update_begin(&dstats->syncp); | |
171 | dstats->rx_pkts++; | |
172 | dstats->rx_bytes += skb->len; | |
173 | u64_stats_update_end(&dstats->syncp); | |
174 | ||
175 | skb->dev = dev; | |
176 | ||
177 | return RX_HANDLER_ANOTHER; | |
178 | } | |
179 | return RX_HANDLER_PASS; | |
180 | } | |
181 | ||
182 | static struct rtnl_link_stats64 *vrf_get_stats64(struct net_device *dev, | |
183 | struct rtnl_link_stats64 *stats) | |
184 | { | |
185 | int i; | |
186 | ||
187 | for_each_possible_cpu(i) { | |
188 | const struct pcpu_dstats *dstats; | |
189 | u64 tbytes, tpkts, tdrops, rbytes, rpkts; | |
190 | unsigned int start; | |
191 | ||
192 | dstats = per_cpu_ptr(dev->dstats, i); | |
193 | do { | |
194 | start = u64_stats_fetch_begin_irq(&dstats->syncp); | |
195 | tbytes = dstats->tx_bytes; | |
196 | tpkts = dstats->tx_pkts; | |
197 | tdrops = dstats->tx_drps; | |
198 | rbytes = dstats->rx_bytes; | |
199 | rpkts = dstats->rx_pkts; | |
200 | } while (u64_stats_fetch_retry_irq(&dstats->syncp, start)); | |
201 | stats->tx_bytes += tbytes; | |
202 | stats->tx_packets += tpkts; | |
203 | stats->tx_dropped += tdrops; | |
204 | stats->rx_bytes += rbytes; | |
205 | stats->rx_packets += rpkts; | |
206 | } | |
207 | return stats; | |
208 | } | |
209 | ||
35402e31 DA |
210 | #if IS_ENABLED(CONFIG_IPV6) |
211 | static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb, | |
212 | struct net_device *dev) | |
213 | { | |
214 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
215 | struct net *net = dev_net(skb->dev); | |
216 | struct flowi6 fl6 = { | |
217 | /* needed to match OIF rule */ | |
218 | .flowi6_oif = dev->ifindex, | |
219 | .flowi6_iif = LOOPBACK_IFINDEX, | |
220 | .daddr = iph->daddr, | |
221 | .saddr = iph->saddr, | |
222 | .flowlabel = ip6_flowinfo(iph), | |
223 | .flowi6_mark = skb->mark, | |
224 | .flowi6_proto = iph->nexthdr, | |
225 | .flowi6_flags = FLOWI_FLAG_L3MDEV_SRC | FLOWI_FLAG_SKIP_NH_OIF, | |
226 | }; | |
227 | int ret = NET_XMIT_DROP; | |
228 | struct dst_entry *dst; | |
229 | struct dst_entry *dst_null = &net->ipv6.ip6_null_entry->dst; | |
230 | ||
231 | dst = ip6_route_output(net, NULL, &fl6); | |
232 | if (dst == dst_null) | |
233 | goto err; | |
234 | ||
235 | skb_dst_drop(skb); | |
236 | skb_dst_set(skb, dst); | |
237 | ||
238 | ret = ip6_local_out(net, skb->sk, skb); | |
239 | if (unlikely(net_xmit_eval(ret))) | |
240 | dev->stats.tx_errors++; | |
241 | else | |
242 | ret = NET_XMIT_SUCCESS; | |
243 | ||
244 | return ret; | |
245 | err: | |
246 | vrf_tx_error(dev, skb); | |
247 | return NET_XMIT_DROP; | |
248 | } | |
249 | #else | |
193125db DA |
250 | static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb, |
251 | struct net_device *dev) | |
252 | { | |
57b8efa1 NA |
253 | vrf_tx_error(dev, skb); |
254 | return NET_XMIT_DROP; | |
193125db | 255 | } |
35402e31 | 256 | #endif |
193125db DA |
257 | |
258 | static int vrf_send_v4_prep(struct sk_buff *skb, struct flowi4 *fl4, | |
259 | struct net_device *vrf_dev) | |
260 | { | |
261 | struct rtable *rt; | |
262 | int err = 1; | |
263 | ||
264 | rt = ip_route_output_flow(dev_net(vrf_dev), fl4, NULL); | |
265 | if (IS_ERR(rt)) | |
266 | goto out; | |
267 | ||
268 | /* TO-DO: what about broadcast ? */ | |
269 | if (rt->rt_type != RTN_UNICAST && rt->rt_type != RTN_LOCAL) { | |
270 | ip_rt_put(rt); | |
271 | goto out; | |
272 | } | |
273 | ||
274 | skb_dst_drop(skb); | |
275 | skb_dst_set(skb, &rt->dst); | |
276 | err = 0; | |
277 | out: | |
278 | return err; | |
279 | } | |
280 | ||
281 | static netdev_tx_t vrf_process_v4_outbound(struct sk_buff *skb, | |
282 | struct net_device *vrf_dev) | |
283 | { | |
284 | struct iphdr *ip4h = ip_hdr(skb); | |
285 | int ret = NET_XMIT_DROP; | |
286 | struct flowi4 fl4 = { | |
287 | /* needed to match OIF rule */ | |
288 | .flowi4_oif = vrf_dev->ifindex, | |
289 | .flowi4_iif = LOOPBACK_IFINDEX, | |
290 | .flowi4_tos = RT_TOS(ip4h->tos), | |
6e2895a8 | 291 | .flowi4_flags = FLOWI_FLAG_ANYSRC | FLOWI_FLAG_L3MDEV_SRC | |
58189ca7 | 292 | FLOWI_FLAG_SKIP_NH_OIF, |
193125db DA |
293 | .daddr = ip4h->daddr, |
294 | }; | |
295 | ||
296 | if (vrf_send_v4_prep(skb, &fl4, vrf_dev)) | |
297 | goto err; | |
298 | ||
299 | if (!ip4h->saddr) { | |
300 | ip4h->saddr = inet_select_addr(skb_dst(skb)->dev, 0, | |
301 | RT_SCOPE_LINK); | |
302 | } | |
303 | ||
33224b16 | 304 | ret = ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb); |
193125db DA |
305 | if (unlikely(net_xmit_eval(ret))) |
306 | vrf_dev->stats.tx_errors++; | |
307 | else | |
308 | ret = NET_XMIT_SUCCESS; | |
309 | ||
310 | out: | |
311 | return ret; | |
312 | err: | |
57b8efa1 | 313 | vrf_tx_error(vrf_dev, skb); |
193125db DA |
314 | goto out; |
315 | } | |
316 | ||
317 | static netdev_tx_t is_ip_tx_frame(struct sk_buff *skb, struct net_device *dev) | |
318 | { | |
8f58336d DA |
319 | /* strip the ethernet header added for pass through VRF device */ |
320 | __skb_pull(skb, skb_network_offset(skb)); | |
321 | ||
193125db DA |
322 | switch (skb->protocol) { |
323 | case htons(ETH_P_IP): | |
324 | return vrf_process_v4_outbound(skb, dev); | |
325 | case htons(ETH_P_IPV6): | |
326 | return vrf_process_v6_outbound(skb, dev); | |
327 | default: | |
57b8efa1 | 328 | vrf_tx_error(dev, skb); |
193125db DA |
329 | return NET_XMIT_DROP; |
330 | } | |
331 | } | |
332 | ||
333 | static netdev_tx_t vrf_xmit(struct sk_buff *skb, struct net_device *dev) | |
334 | { | |
335 | netdev_tx_t ret = is_ip_tx_frame(skb, dev); | |
336 | ||
337 | if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { | |
338 | struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats); | |
339 | ||
340 | u64_stats_update_begin(&dstats->syncp); | |
341 | dstats->tx_pkts++; | |
342 | dstats->tx_bytes += skb->len; | |
343 | u64_stats_update_end(&dstats->syncp); | |
344 | } else { | |
345 | this_cpu_inc(dev->dstats->tx_drps); | |
346 | } | |
347 | ||
348 | return ret; | |
349 | } | |
350 | ||
35402e31 DA |
351 | #if IS_ENABLED(CONFIG_IPV6) |
352 | static struct dst_entry *vrf_ip6_check(struct dst_entry *dst, u32 cookie) | |
353 | { | |
354 | return dst; | |
355 | } | |
356 | ||
357 | static struct dst_ops vrf_dst_ops6 = { | |
358 | .family = AF_INET6, | |
359 | .local_out = ip6_local_out, | |
360 | .check = vrf_ip6_check, | |
361 | .mtu = vrf_v4_mtu, | |
362 | .destroy = vrf_dst_destroy, | |
363 | .default_advmss = vrf_default_advmss, | |
364 | }; | |
365 | ||
366 | static int init_dst_ops6_kmem_cachep(void) | |
367 | { | |
368 | vrf_dst_ops6.kmem_cachep = kmem_cache_create("vrf_ip6_dst_cache", | |
369 | sizeof(struct rt6_info), | |
370 | 0, | |
371 | SLAB_HWCACHE_ALIGN, | |
372 | NULL); | |
373 | ||
374 | if (!vrf_dst_ops6.kmem_cachep) | |
375 | return -ENOMEM; | |
376 | ||
377 | return 0; | |
378 | } | |
379 | ||
380 | static void free_dst_ops6_kmem_cachep(void) | |
381 | { | |
382 | kmem_cache_destroy(vrf_dst_ops6.kmem_cachep); | |
383 | } | |
384 | ||
385 | static int vrf_input6(struct sk_buff *skb) | |
386 | { | |
387 | skb->dev->stats.rx_errors++; | |
388 | kfree_skb(skb); | |
389 | return 0; | |
390 | } | |
391 | ||
392 | /* modelled after ip6_finish_output2 */ | |
393 | static int vrf_finish_output6(struct net *net, struct sock *sk, | |
394 | struct sk_buff *skb) | |
395 | { | |
396 | struct dst_entry *dst = skb_dst(skb); | |
397 | struct net_device *dev = dst->dev; | |
398 | struct neighbour *neigh; | |
399 | struct in6_addr *nexthop; | |
400 | int ret; | |
401 | ||
402 | skb->protocol = htons(ETH_P_IPV6); | |
403 | skb->dev = dev; | |
404 | ||
405 | rcu_read_lock_bh(); | |
406 | nexthop = rt6_nexthop((struct rt6_info *)dst, &ipv6_hdr(skb)->daddr); | |
407 | neigh = __ipv6_neigh_lookup_noref(dst->dev, nexthop); | |
408 | if (unlikely(!neigh)) | |
409 | neigh = __neigh_create(&nd_tbl, nexthop, dst->dev, false); | |
410 | if (!IS_ERR(neigh)) { | |
411 | ret = dst_neigh_output(dst, neigh, skb); | |
412 | rcu_read_unlock_bh(); | |
413 | return ret; | |
414 | } | |
415 | rcu_read_unlock_bh(); | |
416 | ||
417 | IP6_INC_STATS(dev_net(dst->dev), | |
418 | ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES); | |
419 | kfree_skb(skb); | |
420 | return -EINVAL; | |
421 | } | |
422 | ||
423 | /* modelled after ip6_output */ | |
424 | static int vrf_output6(struct net *net, struct sock *sk, struct sk_buff *skb) | |
425 | { | |
426 | return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING, | |
427 | net, sk, skb, NULL, skb_dst(skb)->dev, | |
428 | vrf_finish_output6, | |
429 | !(IP6CB(skb)->flags & IP6SKB_REROUTED)); | |
430 | } | |
431 | ||
432 | static void vrf_rt6_destroy(struct net_vrf *vrf) | |
433 | { | |
434 | dst_destroy(&vrf->rt6->dst); | |
435 | free_percpu(vrf->rt6->rt6i_pcpu); | |
436 | vrf->rt6 = NULL; | |
437 | } | |
438 | ||
439 | static int vrf_rt6_create(struct net_device *dev) | |
440 | { | |
441 | struct net_vrf *vrf = netdev_priv(dev); | |
442 | struct dst_entry *dst; | |
443 | struct rt6_info *rt6; | |
444 | int cpu; | |
445 | int rc = -ENOMEM; | |
446 | ||
447 | rt6 = dst_alloc(&vrf_dst_ops6, dev, 0, | |
448 | DST_OBSOLETE_NONE, | |
449 | (DST_HOST | DST_NOPOLICY | DST_NOXFRM)); | |
450 | if (!rt6) | |
451 | goto out; | |
452 | ||
453 | dst = &rt6->dst; | |
454 | ||
455 | rt6->rt6i_pcpu = alloc_percpu_gfp(struct rt6_info *, GFP_KERNEL); | |
456 | if (!rt6->rt6i_pcpu) { | |
457 | dst_destroy(dst); | |
458 | goto out; | |
459 | } | |
460 | for_each_possible_cpu(cpu) { | |
461 | struct rt6_info **p = per_cpu_ptr(rt6->rt6i_pcpu, cpu); | |
462 | *p = NULL; | |
463 | } | |
464 | ||
465 | memset(dst + 1, 0, sizeof(*rt6) - sizeof(*dst)); | |
466 | ||
467 | INIT_LIST_HEAD(&rt6->rt6i_siblings); | |
468 | INIT_LIST_HEAD(&rt6->rt6i_uncached); | |
469 | ||
470 | rt6->dst.input = vrf_input6; | |
471 | rt6->dst.output = vrf_output6; | |
472 | ||
473 | rt6->rt6i_table = fib6_get_table(dev_net(dev), vrf->tb_id); | |
474 | ||
475 | atomic_set(&rt6->dst.__refcnt, 2); | |
476 | ||
477 | vrf->rt6 = rt6; | |
478 | rc = 0; | |
479 | out: | |
480 | return rc; | |
481 | } | |
482 | #else | |
483 | static int init_dst_ops6_kmem_cachep(void) | |
484 | { | |
485 | return 0; | |
486 | } | |
487 | ||
488 | static void free_dst_ops6_kmem_cachep(void) | |
489 | { | |
490 | } | |
491 | ||
492 | static void vrf_rt6_destroy(struct net_vrf *vrf) | |
493 | { | |
494 | } | |
495 | ||
496 | static int vrf_rt6_create(struct net_device *dev) | |
497 | { | |
498 | return 0; | |
499 | } | |
500 | #endif | |
501 | ||
8f58336d | 502 | /* modelled after ip_finish_output2 */ |
0c4b51f0 | 503 | static int vrf_finish_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
193125db | 504 | { |
8f58336d DA |
505 | struct dst_entry *dst = skb_dst(skb); |
506 | struct rtable *rt = (struct rtable *)dst; | |
507 | struct net_device *dev = dst->dev; | |
508 | unsigned int hh_len = LL_RESERVED_SPACE(dev); | |
509 | struct neighbour *neigh; | |
510 | u32 nexthop; | |
511 | int ret = -EINVAL; | |
512 | ||
513 | /* Be paranoid, rather than too clever. */ | |
514 | if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) { | |
515 | struct sk_buff *skb2; | |
516 | ||
517 | skb2 = skb_realloc_headroom(skb, LL_RESERVED_SPACE(dev)); | |
518 | if (!skb2) { | |
519 | ret = -ENOMEM; | |
520 | goto err; | |
521 | } | |
522 | if (skb->sk) | |
523 | skb_set_owner_w(skb2, skb->sk); | |
524 | ||
525 | consume_skb(skb); | |
526 | skb = skb2; | |
527 | } | |
528 | ||
529 | rcu_read_lock_bh(); | |
530 | ||
531 | nexthop = (__force u32)rt_nexthop(rt, ip_hdr(skb)->daddr); | |
532 | neigh = __ipv4_neigh_lookup_noref(dev, nexthop); | |
533 | if (unlikely(!neigh)) | |
534 | neigh = __neigh_create(&arp_tbl, &nexthop, dev, false); | |
535 | if (!IS_ERR(neigh)) | |
536 | ret = dst_neigh_output(dst, neigh, skb); | |
537 | ||
538 | rcu_read_unlock_bh(); | |
539 | err: | |
540 | if (unlikely(ret < 0)) | |
541 | vrf_tx_error(skb->dev, skb); | |
542 | return ret; | |
193125db DA |
543 | } |
544 | ||
ede2059d | 545 | static int vrf_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
193125db DA |
546 | { |
547 | struct net_device *dev = skb_dst(skb)->dev; | |
548 | ||
29a26a56 | 549 | IP_UPD_PO_STATS(net, IPSTATS_MIB_OUT, skb->len); |
193125db DA |
550 | |
551 | skb->dev = dev; | |
552 | skb->protocol = htons(ETH_P_IP); | |
553 | ||
29a26a56 EB |
554 | return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING, |
555 | net, sk, skb, NULL, dev, | |
8f58336d | 556 | vrf_finish_output, |
193125db DA |
557 | !(IPCB(skb)->flags & IPSKB_REROUTED)); |
558 | } | |
559 | ||
560 | static void vrf_rtable_destroy(struct net_vrf *vrf) | |
561 | { | |
562 | struct dst_entry *dst = (struct dst_entry *)vrf->rth; | |
563 | ||
3a4a27d3 | 564 | dst_destroy(dst); |
193125db DA |
565 | vrf->rth = NULL; |
566 | } | |
567 | ||
568 | static struct rtable *vrf_rtable_create(struct net_device *dev) | |
569 | { | |
b7503e0c | 570 | struct net_vrf *vrf = netdev_priv(dev); |
193125db DA |
571 | struct rtable *rth; |
572 | ||
573 | rth = dst_alloc(&vrf_dst_ops, dev, 2, | |
574 | DST_OBSOLETE_NONE, | |
575 | (DST_HOST | DST_NOPOLICY | DST_NOXFRM)); | |
576 | if (rth) { | |
577 | rth->dst.output = vrf_output; | |
578 | rth->rt_genid = rt_genid_ipv4(dev_net(dev)); | |
579 | rth->rt_flags = 0; | |
580 | rth->rt_type = RTN_UNICAST; | |
581 | rth->rt_is_input = 0; | |
582 | rth->rt_iif = 0; | |
583 | rth->rt_pmtu = 0; | |
584 | rth->rt_gateway = 0; | |
585 | rth->rt_uses_gateway = 0; | |
b7503e0c | 586 | rth->rt_table_id = vrf->tb_id; |
193125db DA |
587 | INIT_LIST_HEAD(&rth->rt_uncached); |
588 | rth->rt_uncached_list = NULL; | |
193125db DA |
589 | } |
590 | ||
591 | return rth; | |
592 | } | |
593 | ||
594 | /**************************** device handling ********************/ | |
595 | ||
596 | /* cycle interface to flush neighbor cache and move routes across tables */ | |
597 | static void cycle_netdev(struct net_device *dev) | |
598 | { | |
599 | unsigned int flags = dev->flags; | |
600 | int ret; | |
601 | ||
602 | if (!netif_running(dev)) | |
603 | return; | |
604 | ||
605 | ret = dev_change_flags(dev, flags & ~IFF_UP); | |
606 | if (ret >= 0) | |
607 | ret = dev_change_flags(dev, flags); | |
608 | ||
609 | if (ret < 0) { | |
610 | netdev_err(dev, | |
611 | "Failed to cycle device %s; route tables might be wrong!\n", | |
612 | dev->name); | |
613 | } | |
614 | } | |
615 | ||
193125db DA |
616 | static int do_vrf_add_slave(struct net_device *dev, struct net_device *port_dev) |
617 | { | |
bad53162 | 618 | int ret; |
193125db | 619 | |
193125db DA |
620 | /* register the packet handler for slave ports */ |
621 | ret = netdev_rx_handler_register(port_dev, vrf_handle_frame, dev); | |
622 | if (ret) { | |
623 | netdev_err(port_dev, | |
624 | "Device %s failed to register rx_handler\n", | |
625 | port_dev->name); | |
15df5e71 | 626 | goto out_fail; |
193125db DA |
627 | } |
628 | ||
29bf24af | 629 | ret = netdev_master_upper_dev_link(port_dev, dev, NULL, NULL); |
193125db DA |
630 | if (ret < 0) |
631 | goto out_unregister; | |
632 | ||
fee6d4c7 | 633 | port_dev->priv_flags |= IFF_L3MDEV_SLAVE; |
193125db DA |
634 | cycle_netdev(port_dev); |
635 | ||
636 | return 0; | |
637 | ||
638 | out_unregister: | |
639 | netdev_rx_handler_unregister(port_dev); | |
193125db | 640 | out_fail: |
193125db DA |
641 | return ret; |
642 | } | |
643 | ||
644 | static int vrf_add_slave(struct net_device *dev, struct net_device *port_dev) | |
645 | { | |
fee6d4c7 | 646 | if (netif_is_l3_master(port_dev) || netif_is_l3_slave(port_dev)) |
193125db DA |
647 | return -EINVAL; |
648 | ||
649 | return do_vrf_add_slave(dev, port_dev); | |
650 | } | |
651 | ||
652 | /* inverse of do_vrf_add_slave */ | |
653 | static int do_vrf_del_slave(struct net_device *dev, struct net_device *port_dev) | |
654 | { | |
193125db | 655 | netdev_upper_dev_unlink(port_dev, dev); |
fee6d4c7 | 656 | port_dev->priv_flags &= ~IFF_L3MDEV_SLAVE; |
193125db DA |
657 | |
658 | netdev_rx_handler_unregister(port_dev); | |
659 | ||
193125db DA |
660 | cycle_netdev(port_dev); |
661 | ||
193125db DA |
662 | return 0; |
663 | } | |
664 | ||
665 | static int vrf_del_slave(struct net_device *dev, struct net_device *port_dev) | |
666 | { | |
193125db DA |
667 | return do_vrf_del_slave(dev, port_dev); |
668 | } | |
669 | ||
670 | static void vrf_dev_uninit(struct net_device *dev) | |
671 | { | |
672 | struct net_vrf *vrf = netdev_priv(dev); | |
bad53162 NA |
673 | struct net_device *port_dev; |
674 | struct list_head *iter; | |
193125db DA |
675 | |
676 | vrf_rtable_destroy(vrf); | |
35402e31 | 677 | vrf_rt6_destroy(vrf); |
193125db | 678 | |
bad53162 NA |
679 | netdev_for_each_lower_dev(dev, port_dev, iter) |
680 | vrf_del_slave(dev, port_dev); | |
193125db | 681 | |
3a4a27d3 | 682 | free_percpu(dev->dstats); |
193125db DA |
683 | dev->dstats = NULL; |
684 | } | |
685 | ||
686 | static int vrf_dev_init(struct net_device *dev) | |
687 | { | |
688 | struct net_vrf *vrf = netdev_priv(dev); | |
689 | ||
193125db DA |
690 | dev->dstats = netdev_alloc_pcpu_stats(struct pcpu_dstats); |
691 | if (!dev->dstats) | |
692 | goto out_nomem; | |
693 | ||
694 | /* create the default dst which points back to us */ | |
695 | vrf->rth = vrf_rtable_create(dev); | |
696 | if (!vrf->rth) | |
697 | goto out_stats; | |
698 | ||
35402e31 DA |
699 | if (vrf_rt6_create(dev) != 0) |
700 | goto out_rth; | |
701 | ||
193125db DA |
702 | dev->flags = IFF_MASTER | IFF_NOARP; |
703 | ||
704 | return 0; | |
705 | ||
35402e31 DA |
706 | out_rth: |
707 | vrf_rtable_destroy(vrf); | |
193125db DA |
708 | out_stats: |
709 | free_percpu(dev->dstats); | |
710 | dev->dstats = NULL; | |
711 | out_nomem: | |
712 | return -ENOMEM; | |
713 | } | |
714 | ||
715 | static const struct net_device_ops vrf_netdev_ops = { | |
716 | .ndo_init = vrf_dev_init, | |
717 | .ndo_uninit = vrf_dev_uninit, | |
718 | .ndo_start_xmit = vrf_xmit, | |
719 | .ndo_get_stats64 = vrf_get_stats64, | |
720 | .ndo_add_slave = vrf_add_slave, | |
721 | .ndo_del_slave = vrf_del_slave, | |
722 | }; | |
723 | ||
ee15ee5d DA |
724 | static u32 vrf_fib_table(const struct net_device *dev) |
725 | { | |
726 | struct net_vrf *vrf = netdev_priv(dev); | |
727 | ||
728 | return vrf->tb_id; | |
729 | } | |
730 | ||
731 | static struct rtable *vrf_get_rtable(const struct net_device *dev, | |
732 | const struct flowi4 *fl4) | |
733 | { | |
734 | struct rtable *rth = NULL; | |
735 | ||
6e2895a8 | 736 | if (!(fl4->flowi4_flags & FLOWI_FLAG_L3MDEV_SRC)) { |
ee15ee5d DA |
737 | struct net_vrf *vrf = netdev_priv(dev); |
738 | ||
739 | rth = vrf->rth; | |
740 | atomic_inc(&rth->dst.__refcnt); | |
741 | } | |
742 | ||
743 | return rth; | |
744 | } | |
745 | ||
8cbb512c | 746 | /* called under rcu_read_lock */ |
b5bdacf3 | 747 | static int vrf_get_saddr(struct net_device *dev, struct flowi4 *fl4) |
8cbb512c DA |
748 | { |
749 | struct fib_result res = { .tclassid = 0 }; | |
750 | struct net *net = dev_net(dev); | |
751 | u32 orig_tos = fl4->flowi4_tos; | |
752 | u8 flags = fl4->flowi4_flags; | |
753 | u8 scope = fl4->flowi4_scope; | |
754 | u8 tos = RT_FL_TOS(fl4); | |
b5bdacf3 | 755 | int rc; |
8cbb512c DA |
756 | |
757 | if (unlikely(!fl4->daddr)) | |
b5bdacf3 | 758 | return 0; |
8cbb512c DA |
759 | |
760 | fl4->flowi4_flags |= FLOWI_FLAG_SKIP_NH_OIF; | |
761 | fl4->flowi4_iif = LOOPBACK_IFINDEX; | |
762 | fl4->flowi4_tos = tos & IPTOS_RT_MASK; | |
763 | fl4->flowi4_scope = ((tos & RTO_ONLINK) ? | |
764 | RT_SCOPE_LINK : RT_SCOPE_UNIVERSE); | |
765 | ||
b5bdacf3 DA |
766 | rc = fib_lookup(net, fl4, &res, 0); |
767 | if (!rc) { | |
8cbb512c DA |
768 | if (res.type == RTN_LOCAL) |
769 | fl4->saddr = res.fi->fib_prefsrc ? : fl4->daddr; | |
770 | else | |
771 | fib_select_path(net, &res, fl4, -1); | |
772 | } | |
773 | ||
774 | fl4->flowi4_flags = flags; | |
775 | fl4->flowi4_tos = orig_tos; | |
776 | fl4->flowi4_scope = scope; | |
b5bdacf3 DA |
777 | |
778 | return rc; | |
8cbb512c DA |
779 | } |
780 | ||
35402e31 DA |
781 | #if IS_ENABLED(CONFIG_IPV6) |
782 | static struct dst_entry *vrf_get_rt6_dst(const struct net_device *dev, | |
783 | const struct flowi6 *fl6) | |
784 | { | |
785 | struct rt6_info *rt = NULL; | |
786 | ||
787 | if (!(fl6->flowi6_flags & FLOWI_FLAG_L3MDEV_SRC)) { | |
788 | struct net_vrf *vrf = netdev_priv(dev); | |
789 | ||
790 | rt = vrf->rt6; | |
791 | atomic_inc(&rt->dst.__refcnt); | |
792 | } | |
793 | ||
794 | return (struct dst_entry *)rt; | |
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, |
35402e31 DA |
802 | #if IS_ENABLED(CONFIG_IPV6) |
803 | .l3mdev_get_rt6_dst = vrf_get_rt6_dst, | |
804 | #endif | |
ee15ee5d DA |
805 | }; |
806 | ||
193125db DA |
807 | static void vrf_get_drvinfo(struct net_device *dev, |
808 | struct ethtool_drvinfo *info) | |
809 | { | |
810 | strlcpy(info->driver, DRV_NAME, sizeof(info->driver)); | |
811 | strlcpy(info->version, DRV_VERSION, sizeof(info->version)); | |
812 | } | |
813 | ||
814 | static const struct ethtool_ops vrf_ethtool_ops = { | |
815 | .get_drvinfo = vrf_get_drvinfo, | |
816 | }; | |
817 | ||
818 | static void vrf_setup(struct net_device *dev) | |
819 | { | |
820 | ether_setup(dev); | |
821 | ||
822 | /* Initialize the device structure. */ | |
823 | dev->netdev_ops = &vrf_netdev_ops; | |
ee15ee5d | 824 | dev->l3mdev_ops = &vrf_l3mdev_ops; |
193125db DA |
825 | dev->ethtool_ops = &vrf_ethtool_ops; |
826 | dev->destructor = free_netdev; | |
827 | ||
828 | /* Fill in device structure with ethernet-generic values. */ | |
829 | eth_hw_addr_random(dev); | |
830 | ||
831 | /* don't acquire vrf device's netif_tx_lock when transmitting */ | |
832 | dev->features |= NETIF_F_LLTX; | |
833 | ||
834 | /* don't allow vrf devices to change network namespaces. */ | |
835 | dev->features |= NETIF_F_NETNS_LOCAL; | |
836 | } | |
837 | ||
838 | static int vrf_validate(struct nlattr *tb[], struct nlattr *data[]) | |
839 | { | |
840 | if (tb[IFLA_ADDRESS]) { | |
841 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) | |
842 | return -EINVAL; | |
843 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) | |
844 | return -EADDRNOTAVAIL; | |
845 | } | |
846 | return 0; | |
847 | } | |
848 | ||
849 | static void vrf_dellink(struct net_device *dev, struct list_head *head) | |
850 | { | |
193125db DA |
851 | unregister_netdevice_queue(dev, head); |
852 | } | |
853 | ||
854 | static int vrf_newlink(struct net *src_net, struct net_device *dev, | |
855 | struct nlattr *tb[], struct nlattr *data[]) | |
856 | { | |
857 | struct net_vrf *vrf = netdev_priv(dev); | |
193125db DA |
858 | |
859 | if (!data || !data[IFLA_VRF_TABLE]) | |
860 | return -EINVAL; | |
861 | ||
862 | vrf->tb_id = nla_get_u32(data[IFLA_VRF_TABLE]); | |
863 | ||
007979ea | 864 | dev->priv_flags |= IFF_L3MDEV_MASTER; |
193125db | 865 | |
7f109f7c | 866 | return register_netdevice(dev); |
193125db DA |
867 | } |
868 | ||
869 | static size_t vrf_nl_getsize(const struct net_device *dev) | |
870 | { | |
871 | return nla_total_size(sizeof(u32)); /* IFLA_VRF_TABLE */ | |
872 | } | |
873 | ||
874 | static int vrf_fillinfo(struct sk_buff *skb, | |
875 | const struct net_device *dev) | |
876 | { | |
877 | struct net_vrf *vrf = netdev_priv(dev); | |
878 | ||
879 | return nla_put_u32(skb, IFLA_VRF_TABLE, vrf->tb_id); | |
880 | } | |
881 | ||
67eb0331 DA |
882 | static size_t vrf_get_slave_size(const struct net_device *bond_dev, |
883 | const struct net_device *slave_dev) | |
884 | { | |
885 | return nla_total_size(sizeof(u32)); /* IFLA_VRF_PORT_TABLE */ | |
886 | } | |
887 | ||
888 | static int vrf_fill_slave_info(struct sk_buff *skb, | |
889 | const struct net_device *vrf_dev, | |
890 | const struct net_device *slave_dev) | |
891 | { | |
892 | struct net_vrf *vrf = netdev_priv(vrf_dev); | |
893 | ||
894 | if (nla_put_u32(skb, IFLA_VRF_PORT_TABLE, vrf->tb_id)) | |
895 | return -EMSGSIZE; | |
896 | ||
897 | return 0; | |
898 | } | |
899 | ||
193125db DA |
900 | static const struct nla_policy vrf_nl_policy[IFLA_VRF_MAX + 1] = { |
901 | [IFLA_VRF_TABLE] = { .type = NLA_U32 }, | |
902 | }; | |
903 | ||
904 | static struct rtnl_link_ops vrf_link_ops __read_mostly = { | |
905 | .kind = DRV_NAME, | |
906 | .priv_size = sizeof(struct net_vrf), | |
907 | ||
908 | .get_size = vrf_nl_getsize, | |
909 | .policy = vrf_nl_policy, | |
910 | .validate = vrf_validate, | |
911 | .fill_info = vrf_fillinfo, | |
912 | ||
67eb0331 DA |
913 | .get_slave_size = vrf_get_slave_size, |
914 | .fill_slave_info = vrf_fill_slave_info, | |
915 | ||
193125db DA |
916 | .newlink = vrf_newlink, |
917 | .dellink = vrf_dellink, | |
918 | .setup = vrf_setup, | |
919 | .maxtype = IFLA_VRF_MAX, | |
920 | }; | |
921 | ||
922 | static int vrf_device_event(struct notifier_block *unused, | |
923 | unsigned long event, void *ptr) | |
924 | { | |
925 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
926 | ||
927 | /* only care about unregister events to drop slave references */ | |
928 | if (event == NETDEV_UNREGISTER) { | |
193125db DA |
929 | struct net_device *vrf_dev; |
930 | ||
fee6d4c7 | 931 | if (!netif_is_l3_slave(dev)) |
193125db DA |
932 | goto out; |
933 | ||
58aa9087 NA |
934 | vrf_dev = netdev_master_upper_dev_get(dev); |
935 | vrf_del_slave(vrf_dev, dev); | |
193125db DA |
936 | } |
937 | out: | |
938 | return NOTIFY_DONE; | |
939 | } | |
940 | ||
941 | static struct notifier_block vrf_notifier_block __read_mostly = { | |
942 | .notifier_call = vrf_device_event, | |
943 | }; | |
944 | ||
945 | static int __init vrf_init_module(void) | |
946 | { | |
947 | int rc; | |
948 | ||
949 | vrf_dst_ops.kmem_cachep = | |
950 | kmem_cache_create("vrf_ip_dst_cache", | |
951 | sizeof(struct rtable), 0, | |
e367da02 | 952 | SLAB_HWCACHE_ALIGN, |
193125db DA |
953 | NULL); |
954 | ||
955 | if (!vrf_dst_ops.kmem_cachep) | |
956 | return -ENOMEM; | |
957 | ||
35402e31 DA |
958 | rc = init_dst_ops6_kmem_cachep(); |
959 | if (rc != 0) | |
960 | goto error2; | |
961 | ||
193125db DA |
962 | register_netdevice_notifier(&vrf_notifier_block); |
963 | ||
964 | rc = rtnl_link_register(&vrf_link_ops); | |
965 | if (rc < 0) | |
966 | goto error; | |
967 | ||
968 | return 0; | |
969 | ||
970 | error: | |
971 | unregister_netdevice_notifier(&vrf_notifier_block); | |
35402e31 DA |
972 | free_dst_ops6_kmem_cachep(); |
973 | error2: | |
193125db DA |
974 | kmem_cache_destroy(vrf_dst_ops.kmem_cachep); |
975 | return rc; | |
976 | } | |
977 | ||
978 | static void __exit vrf_cleanup_module(void) | |
979 | { | |
980 | rtnl_link_unregister(&vrf_link_ops); | |
981 | unregister_netdevice_notifier(&vrf_notifier_block); | |
982 | kmem_cache_destroy(vrf_dst_ops.kmem_cachep); | |
35402e31 | 983 | free_dst_ops6_kmem_cachep(); |
193125db DA |
984 | } |
985 | ||
986 | module_init(vrf_init_module); | |
987 | module_exit(vrf_cleanup_module); | |
988 | MODULE_AUTHOR("Shrijeet Mukherjee, David Ahern"); | |
989 | MODULE_DESCRIPTION("Device driver to instantiate VRF domains"); | |
990 | MODULE_LICENSE("GPL"); | |
991 | MODULE_ALIAS_RTNL_LINK(DRV_NAME); | |
992 | MODULE_VERSION(DRV_VERSION); |