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 DA |
46 | struct rtable __rcu *rth; |
47 | struct rt6_info __rcu *rt6; | |
ec539514 DA |
48 | u32 tb_id; |
49 | }; | |
50 | ||
193125db DA |
51 | struct pcpu_dstats { |
52 | u64 tx_pkts; | |
53 | u64 tx_bytes; | |
54 | u64 tx_drps; | |
55 | u64 rx_pkts; | |
56 | u64 rx_bytes; | |
57 | struct u64_stats_sync syncp; | |
58 | }; | |
59 | ||
57b8efa1 NA |
60 | static void vrf_tx_error(struct net_device *vrf_dev, struct sk_buff *skb) |
61 | { | |
62 | vrf_dev->stats.tx_errors++; | |
63 | kfree_skb(skb); | |
64 | } | |
65 | ||
193125db DA |
66 | static struct rtnl_link_stats64 *vrf_get_stats64(struct net_device *dev, |
67 | struct rtnl_link_stats64 *stats) | |
68 | { | |
69 | int i; | |
70 | ||
71 | for_each_possible_cpu(i) { | |
72 | const struct pcpu_dstats *dstats; | |
73 | u64 tbytes, tpkts, tdrops, rbytes, rpkts; | |
74 | unsigned int start; | |
75 | ||
76 | dstats = per_cpu_ptr(dev->dstats, i); | |
77 | do { | |
78 | start = u64_stats_fetch_begin_irq(&dstats->syncp); | |
79 | tbytes = dstats->tx_bytes; | |
80 | tpkts = dstats->tx_pkts; | |
81 | tdrops = dstats->tx_drps; | |
82 | rbytes = dstats->rx_bytes; | |
83 | rpkts = dstats->rx_pkts; | |
84 | } while (u64_stats_fetch_retry_irq(&dstats->syncp, start)); | |
85 | stats->tx_bytes += tbytes; | |
86 | stats->tx_packets += tpkts; | |
87 | stats->tx_dropped += tdrops; | |
88 | stats->rx_bytes += rbytes; | |
89 | stats->rx_packets += rpkts; | |
90 | } | |
91 | return stats; | |
92 | } | |
93 | ||
35402e31 DA |
94 | #if IS_ENABLED(CONFIG_IPV6) |
95 | static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb, | |
96 | struct net_device *dev) | |
97 | { | |
98 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
99 | struct net *net = dev_net(skb->dev); | |
100 | struct flowi6 fl6 = { | |
101 | /* needed to match OIF rule */ | |
102 | .flowi6_oif = dev->ifindex, | |
103 | .flowi6_iif = LOOPBACK_IFINDEX, | |
104 | .daddr = iph->daddr, | |
105 | .saddr = iph->saddr, | |
106 | .flowlabel = ip6_flowinfo(iph), | |
107 | .flowi6_mark = skb->mark, | |
108 | .flowi6_proto = iph->nexthdr, | |
109 | .flowi6_flags = FLOWI_FLAG_L3MDEV_SRC | FLOWI_FLAG_SKIP_NH_OIF, | |
110 | }; | |
111 | int ret = NET_XMIT_DROP; | |
112 | struct dst_entry *dst; | |
113 | struct dst_entry *dst_null = &net->ipv6.ip6_null_entry->dst; | |
114 | ||
115 | dst = ip6_route_output(net, NULL, &fl6); | |
116 | if (dst == dst_null) | |
117 | goto err; | |
118 | ||
119 | skb_dst_drop(skb); | |
120 | skb_dst_set(skb, dst); | |
121 | ||
122 | ret = ip6_local_out(net, skb->sk, skb); | |
123 | if (unlikely(net_xmit_eval(ret))) | |
124 | dev->stats.tx_errors++; | |
125 | else | |
126 | ret = NET_XMIT_SUCCESS; | |
127 | ||
128 | return ret; | |
129 | err: | |
130 | vrf_tx_error(dev, skb); | |
131 | return NET_XMIT_DROP; | |
132 | } | |
133 | #else | |
193125db DA |
134 | static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb, |
135 | struct net_device *dev) | |
136 | { | |
57b8efa1 NA |
137 | vrf_tx_error(dev, skb); |
138 | return NET_XMIT_DROP; | |
193125db | 139 | } |
35402e31 | 140 | #endif |
193125db DA |
141 | |
142 | static int vrf_send_v4_prep(struct sk_buff *skb, struct flowi4 *fl4, | |
143 | struct net_device *vrf_dev) | |
144 | { | |
145 | struct rtable *rt; | |
146 | int err = 1; | |
147 | ||
148 | rt = ip_route_output_flow(dev_net(vrf_dev), fl4, NULL); | |
149 | if (IS_ERR(rt)) | |
150 | goto out; | |
151 | ||
152 | /* TO-DO: what about broadcast ? */ | |
153 | if (rt->rt_type != RTN_UNICAST && rt->rt_type != RTN_LOCAL) { | |
154 | ip_rt_put(rt); | |
155 | goto out; | |
156 | } | |
157 | ||
158 | skb_dst_drop(skb); | |
159 | skb_dst_set(skb, &rt->dst); | |
160 | err = 0; | |
161 | out: | |
162 | return err; | |
163 | } | |
164 | ||
165 | static netdev_tx_t vrf_process_v4_outbound(struct sk_buff *skb, | |
166 | struct net_device *vrf_dev) | |
167 | { | |
168 | struct iphdr *ip4h = ip_hdr(skb); | |
169 | int ret = NET_XMIT_DROP; | |
170 | struct flowi4 fl4 = { | |
171 | /* needed to match OIF rule */ | |
172 | .flowi4_oif = vrf_dev->ifindex, | |
173 | .flowi4_iif = LOOPBACK_IFINDEX, | |
174 | .flowi4_tos = RT_TOS(ip4h->tos), | |
6e2895a8 | 175 | .flowi4_flags = FLOWI_FLAG_ANYSRC | FLOWI_FLAG_L3MDEV_SRC | |
58189ca7 | 176 | FLOWI_FLAG_SKIP_NH_OIF, |
193125db DA |
177 | .daddr = ip4h->daddr, |
178 | }; | |
179 | ||
180 | if (vrf_send_v4_prep(skb, &fl4, vrf_dev)) | |
181 | goto err; | |
182 | ||
183 | if (!ip4h->saddr) { | |
184 | ip4h->saddr = inet_select_addr(skb_dst(skb)->dev, 0, | |
185 | RT_SCOPE_LINK); | |
186 | } | |
187 | ||
33224b16 | 188 | ret = ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb); |
193125db DA |
189 | if (unlikely(net_xmit_eval(ret))) |
190 | vrf_dev->stats.tx_errors++; | |
191 | else | |
192 | ret = NET_XMIT_SUCCESS; | |
193 | ||
194 | out: | |
195 | return ret; | |
196 | err: | |
57b8efa1 | 197 | vrf_tx_error(vrf_dev, skb); |
193125db DA |
198 | goto out; |
199 | } | |
200 | ||
201 | static netdev_tx_t is_ip_tx_frame(struct sk_buff *skb, struct net_device *dev) | |
202 | { | |
8f58336d DA |
203 | /* strip the ethernet header added for pass through VRF device */ |
204 | __skb_pull(skb, skb_network_offset(skb)); | |
205 | ||
193125db DA |
206 | switch (skb->protocol) { |
207 | case htons(ETH_P_IP): | |
208 | return vrf_process_v4_outbound(skb, dev); | |
209 | case htons(ETH_P_IPV6): | |
210 | return vrf_process_v6_outbound(skb, dev); | |
211 | default: | |
57b8efa1 | 212 | vrf_tx_error(dev, skb); |
193125db DA |
213 | return NET_XMIT_DROP; |
214 | } | |
215 | } | |
216 | ||
217 | static netdev_tx_t vrf_xmit(struct sk_buff *skb, struct net_device *dev) | |
218 | { | |
219 | netdev_tx_t ret = is_ip_tx_frame(skb, dev); | |
220 | ||
221 | if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { | |
222 | struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats); | |
223 | ||
224 | u64_stats_update_begin(&dstats->syncp); | |
225 | dstats->tx_pkts++; | |
226 | dstats->tx_bytes += skb->len; | |
227 | u64_stats_update_end(&dstats->syncp); | |
228 | } else { | |
229 | this_cpu_inc(dev->dstats->tx_drps); | |
230 | } | |
231 | ||
232 | return ret; | |
233 | } | |
234 | ||
35402e31 | 235 | #if IS_ENABLED(CONFIG_IPV6) |
35402e31 DA |
236 | /* modelled after ip6_finish_output2 */ |
237 | static int vrf_finish_output6(struct net *net, struct sock *sk, | |
238 | struct sk_buff *skb) | |
239 | { | |
240 | struct dst_entry *dst = skb_dst(skb); | |
241 | struct net_device *dev = dst->dev; | |
242 | struct neighbour *neigh; | |
243 | struct in6_addr *nexthop; | |
244 | int ret; | |
245 | ||
246 | skb->protocol = htons(ETH_P_IPV6); | |
247 | skb->dev = dev; | |
248 | ||
249 | rcu_read_lock_bh(); | |
250 | nexthop = rt6_nexthop((struct rt6_info *)dst, &ipv6_hdr(skb)->daddr); | |
251 | neigh = __ipv6_neigh_lookup_noref(dst->dev, nexthop); | |
252 | if (unlikely(!neigh)) | |
253 | neigh = __neigh_create(&nd_tbl, nexthop, dst->dev, false); | |
254 | if (!IS_ERR(neigh)) { | |
255 | ret = dst_neigh_output(dst, neigh, skb); | |
256 | rcu_read_unlock_bh(); | |
257 | return ret; | |
258 | } | |
259 | rcu_read_unlock_bh(); | |
260 | ||
261 | IP6_INC_STATS(dev_net(dst->dev), | |
262 | ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES); | |
263 | kfree_skb(skb); | |
264 | return -EINVAL; | |
265 | } | |
266 | ||
267 | /* modelled after ip6_output */ | |
268 | static int vrf_output6(struct net *net, struct sock *sk, struct sk_buff *skb) | |
269 | { | |
270 | return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING, | |
271 | net, sk, skb, NULL, skb_dst(skb)->dev, | |
272 | vrf_finish_output6, | |
273 | !(IP6CB(skb)->flags & IP6SKB_REROUTED)); | |
274 | } | |
275 | ||
b0e95ccd | 276 | /* holding rtnl */ |
9ab179d8 | 277 | static void vrf_rt6_release(struct net_vrf *vrf) |
35402e31 | 278 | { |
b0e95ccd DA |
279 | struct rt6_info *rt6 = rtnl_dereference(vrf->rt6); |
280 | ||
281 | rcu_assign_pointer(vrf->rt6, NULL); | |
282 | ||
283 | if (rt6) | |
284 | dst_release(&rt6->dst); | |
35402e31 DA |
285 | } |
286 | ||
287 | static int vrf_rt6_create(struct net_device *dev) | |
288 | { | |
289 | struct net_vrf *vrf = netdev_priv(dev); | |
9ab179d8 | 290 | struct net *net = dev_net(dev); |
b3b4663c | 291 | struct fib6_table *rt6i_table; |
35402e31 | 292 | struct rt6_info *rt6; |
35402e31 DA |
293 | int rc = -ENOMEM; |
294 | ||
b3b4663c DA |
295 | rt6i_table = fib6_new_table(net, vrf->tb_id); |
296 | if (!rt6i_table) | |
297 | goto out; | |
298 | ||
9ab179d8 DA |
299 | rt6 = ip6_dst_alloc(net, dev, |
300 | DST_HOST | DST_NOPOLICY | DST_NOXFRM | DST_NOCACHE); | |
35402e31 DA |
301 | if (!rt6) |
302 | goto out; | |
303 | ||
9ab179d8 | 304 | dst_hold(&rt6->dst); |
b3b4663c DA |
305 | |
306 | rt6->rt6i_table = rt6i_table; | |
307 | rt6->dst.output = vrf_output6; | |
b0e95ccd DA |
308 | rcu_assign_pointer(vrf->rt6, rt6); |
309 | ||
35402e31 DA |
310 | rc = 0; |
311 | out: | |
312 | return rc; | |
313 | } | |
314 | #else | |
9ab179d8 | 315 | static void vrf_rt6_release(struct net_vrf *vrf) |
35402e31 DA |
316 | { |
317 | } | |
318 | ||
319 | static int vrf_rt6_create(struct net_device *dev) | |
320 | { | |
321 | return 0; | |
322 | } | |
323 | #endif | |
324 | ||
8f58336d | 325 | /* modelled after ip_finish_output2 */ |
0c4b51f0 | 326 | static int vrf_finish_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
193125db | 327 | { |
8f58336d DA |
328 | struct dst_entry *dst = skb_dst(skb); |
329 | struct rtable *rt = (struct rtable *)dst; | |
330 | struct net_device *dev = dst->dev; | |
331 | unsigned int hh_len = LL_RESERVED_SPACE(dev); | |
332 | struct neighbour *neigh; | |
333 | u32 nexthop; | |
334 | int ret = -EINVAL; | |
335 | ||
336 | /* Be paranoid, rather than too clever. */ | |
337 | if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) { | |
338 | struct sk_buff *skb2; | |
339 | ||
340 | skb2 = skb_realloc_headroom(skb, LL_RESERVED_SPACE(dev)); | |
341 | if (!skb2) { | |
342 | ret = -ENOMEM; | |
343 | goto err; | |
344 | } | |
345 | if (skb->sk) | |
346 | skb_set_owner_w(skb2, skb->sk); | |
347 | ||
348 | consume_skb(skb); | |
349 | skb = skb2; | |
350 | } | |
351 | ||
352 | rcu_read_lock_bh(); | |
353 | ||
354 | nexthop = (__force u32)rt_nexthop(rt, ip_hdr(skb)->daddr); | |
355 | neigh = __ipv4_neigh_lookup_noref(dev, nexthop); | |
356 | if (unlikely(!neigh)) | |
357 | neigh = __neigh_create(&arp_tbl, &nexthop, dev, false); | |
358 | if (!IS_ERR(neigh)) | |
359 | ret = dst_neigh_output(dst, neigh, skb); | |
360 | ||
361 | rcu_read_unlock_bh(); | |
362 | err: | |
363 | if (unlikely(ret < 0)) | |
364 | vrf_tx_error(skb->dev, skb); | |
365 | return ret; | |
193125db DA |
366 | } |
367 | ||
ede2059d | 368 | static int vrf_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
193125db DA |
369 | { |
370 | struct net_device *dev = skb_dst(skb)->dev; | |
371 | ||
29a26a56 | 372 | IP_UPD_PO_STATS(net, IPSTATS_MIB_OUT, skb->len); |
193125db DA |
373 | |
374 | skb->dev = dev; | |
375 | skb->protocol = htons(ETH_P_IP); | |
376 | ||
29a26a56 EB |
377 | return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING, |
378 | net, sk, skb, NULL, dev, | |
8f58336d | 379 | vrf_finish_output, |
193125db DA |
380 | !(IPCB(skb)->flags & IPSKB_REROUTED)); |
381 | } | |
382 | ||
b0e95ccd | 383 | /* holding rtnl */ |
9ab179d8 | 384 | static void vrf_rtable_release(struct net_vrf *vrf) |
193125db | 385 | { |
b0e95ccd DA |
386 | struct rtable *rth = rtnl_dereference(vrf->rth); |
387 | ||
388 | rcu_assign_pointer(vrf->rth, NULL); | |
193125db | 389 | |
b0e95ccd DA |
390 | if (rth) |
391 | dst_release(&rth->dst); | |
193125db DA |
392 | } |
393 | ||
b0e95ccd | 394 | static int vrf_rtable_create(struct net_device *dev) |
193125db | 395 | { |
b7503e0c | 396 | struct net_vrf *vrf = netdev_priv(dev); |
193125db DA |
397 | struct rtable *rth; |
398 | ||
b3b4663c | 399 | if (!fib_new_table(dev_net(dev), vrf->tb_id)) |
b0e95ccd | 400 | return -ENOMEM; |
b3b4663c | 401 | |
9ab179d8 | 402 | rth = rt_dst_alloc(dev, 0, RTN_UNICAST, 1, 1, 0); |
b0e95ccd DA |
403 | if (!rth) |
404 | return -ENOMEM; | |
193125db | 405 | |
b0e95ccd DA |
406 | rth->dst.output = vrf_output; |
407 | rth->rt_table_id = vrf->tb_id; | |
408 | ||
409 | rcu_assign_pointer(vrf->rth, rth); | |
410 | ||
411 | return 0; | |
193125db DA |
412 | } |
413 | ||
414 | /**************************** device handling ********************/ | |
415 | ||
416 | /* cycle interface to flush neighbor cache and move routes across tables */ | |
417 | static void cycle_netdev(struct net_device *dev) | |
418 | { | |
419 | unsigned int flags = dev->flags; | |
420 | int ret; | |
421 | ||
422 | if (!netif_running(dev)) | |
423 | return; | |
424 | ||
425 | ret = dev_change_flags(dev, flags & ~IFF_UP); | |
426 | if (ret >= 0) | |
427 | ret = dev_change_flags(dev, flags); | |
428 | ||
429 | if (ret < 0) { | |
430 | netdev_err(dev, | |
431 | "Failed to cycle device %s; route tables might be wrong!\n", | |
432 | dev->name); | |
433 | } | |
434 | } | |
435 | ||
193125db DA |
436 | static int do_vrf_add_slave(struct net_device *dev, struct net_device *port_dev) |
437 | { | |
bad53162 | 438 | int ret; |
193125db | 439 | |
29bf24af | 440 | ret = netdev_master_upper_dev_link(port_dev, dev, NULL, NULL); |
193125db | 441 | if (ret < 0) |
74b20582 | 442 | return ret; |
193125db | 443 | |
fee6d4c7 | 444 | port_dev->priv_flags |= IFF_L3MDEV_SLAVE; |
193125db DA |
445 | cycle_netdev(port_dev); |
446 | ||
447 | return 0; | |
193125db DA |
448 | } |
449 | ||
450 | static int vrf_add_slave(struct net_device *dev, struct net_device *port_dev) | |
451 | { | |
fee6d4c7 | 452 | if (netif_is_l3_master(port_dev) || netif_is_l3_slave(port_dev)) |
193125db DA |
453 | return -EINVAL; |
454 | ||
455 | return do_vrf_add_slave(dev, port_dev); | |
456 | } | |
457 | ||
458 | /* inverse of do_vrf_add_slave */ | |
459 | static int do_vrf_del_slave(struct net_device *dev, struct net_device *port_dev) | |
460 | { | |
193125db | 461 | netdev_upper_dev_unlink(port_dev, dev); |
fee6d4c7 | 462 | port_dev->priv_flags &= ~IFF_L3MDEV_SLAVE; |
193125db | 463 | |
193125db DA |
464 | cycle_netdev(port_dev); |
465 | ||
193125db DA |
466 | return 0; |
467 | } | |
468 | ||
469 | static int vrf_del_slave(struct net_device *dev, struct net_device *port_dev) | |
470 | { | |
193125db DA |
471 | return do_vrf_del_slave(dev, port_dev); |
472 | } | |
473 | ||
474 | static void vrf_dev_uninit(struct net_device *dev) | |
475 | { | |
476 | struct net_vrf *vrf = netdev_priv(dev); | |
bad53162 NA |
477 | struct net_device *port_dev; |
478 | struct list_head *iter; | |
193125db | 479 | |
9ab179d8 DA |
480 | vrf_rtable_release(vrf); |
481 | vrf_rt6_release(vrf); | |
193125db | 482 | |
bad53162 NA |
483 | netdev_for_each_lower_dev(dev, port_dev, iter) |
484 | vrf_del_slave(dev, port_dev); | |
193125db | 485 | |
3a4a27d3 | 486 | free_percpu(dev->dstats); |
193125db DA |
487 | dev->dstats = NULL; |
488 | } | |
489 | ||
490 | static int vrf_dev_init(struct net_device *dev) | |
491 | { | |
492 | struct net_vrf *vrf = netdev_priv(dev); | |
493 | ||
193125db DA |
494 | dev->dstats = netdev_alloc_pcpu_stats(struct pcpu_dstats); |
495 | if (!dev->dstats) | |
496 | goto out_nomem; | |
497 | ||
498 | /* create the default dst which points back to us */ | |
b0e95ccd | 499 | if (vrf_rtable_create(dev) != 0) |
193125db DA |
500 | goto out_stats; |
501 | ||
35402e31 DA |
502 | if (vrf_rt6_create(dev) != 0) |
503 | goto out_rth; | |
504 | ||
193125db DA |
505 | dev->flags = IFF_MASTER | IFF_NOARP; |
506 | ||
507 | return 0; | |
508 | ||
35402e31 | 509 | out_rth: |
9ab179d8 | 510 | vrf_rtable_release(vrf); |
193125db DA |
511 | out_stats: |
512 | free_percpu(dev->dstats); | |
513 | dev->dstats = NULL; | |
514 | out_nomem: | |
515 | return -ENOMEM; | |
516 | } | |
517 | ||
518 | static const struct net_device_ops vrf_netdev_ops = { | |
519 | .ndo_init = vrf_dev_init, | |
520 | .ndo_uninit = vrf_dev_uninit, | |
521 | .ndo_start_xmit = vrf_xmit, | |
522 | .ndo_get_stats64 = vrf_get_stats64, | |
523 | .ndo_add_slave = vrf_add_slave, | |
524 | .ndo_del_slave = vrf_del_slave, | |
525 | }; | |
526 | ||
ee15ee5d DA |
527 | static u32 vrf_fib_table(const struct net_device *dev) |
528 | { | |
529 | struct net_vrf *vrf = netdev_priv(dev); | |
530 | ||
531 | return vrf->tb_id; | |
532 | } | |
533 | ||
534 | static struct rtable *vrf_get_rtable(const struct net_device *dev, | |
535 | const struct flowi4 *fl4) | |
536 | { | |
537 | struct rtable *rth = NULL; | |
538 | ||
6e2895a8 | 539 | if (!(fl4->flowi4_flags & FLOWI_FLAG_L3MDEV_SRC)) { |
ee15ee5d DA |
540 | struct net_vrf *vrf = netdev_priv(dev); |
541 | ||
b0e95ccd DA |
542 | rcu_read_lock(); |
543 | ||
544 | rth = rcu_dereference(vrf->rth); | |
545 | if (likely(rth)) | |
546 | dst_hold(&rth->dst); | |
547 | ||
548 | rcu_read_unlock(); | |
ee15ee5d DA |
549 | } |
550 | ||
551 | return rth; | |
552 | } | |
553 | ||
8cbb512c | 554 | /* called under rcu_read_lock */ |
b5bdacf3 | 555 | static int vrf_get_saddr(struct net_device *dev, struct flowi4 *fl4) |
8cbb512c DA |
556 | { |
557 | struct fib_result res = { .tclassid = 0 }; | |
558 | struct net *net = dev_net(dev); | |
559 | u32 orig_tos = fl4->flowi4_tos; | |
560 | u8 flags = fl4->flowi4_flags; | |
561 | u8 scope = fl4->flowi4_scope; | |
562 | u8 tos = RT_FL_TOS(fl4); | |
b5bdacf3 | 563 | int rc; |
8cbb512c DA |
564 | |
565 | if (unlikely(!fl4->daddr)) | |
b5bdacf3 | 566 | return 0; |
8cbb512c DA |
567 | |
568 | fl4->flowi4_flags |= FLOWI_FLAG_SKIP_NH_OIF; | |
569 | fl4->flowi4_iif = LOOPBACK_IFINDEX; | |
1ff23bee DA |
570 | /* make sure oif is set to VRF device for lookup */ |
571 | fl4->flowi4_oif = dev->ifindex; | |
8cbb512c DA |
572 | fl4->flowi4_tos = tos & IPTOS_RT_MASK; |
573 | fl4->flowi4_scope = ((tos & RTO_ONLINK) ? | |
574 | RT_SCOPE_LINK : RT_SCOPE_UNIVERSE); | |
575 | ||
b5bdacf3 DA |
576 | rc = fib_lookup(net, fl4, &res, 0); |
577 | if (!rc) { | |
8cbb512c DA |
578 | if (res.type == RTN_LOCAL) |
579 | fl4->saddr = res.fi->fib_prefsrc ? : fl4->daddr; | |
580 | else | |
581 | fib_select_path(net, &res, fl4, -1); | |
582 | } | |
583 | ||
584 | fl4->flowi4_flags = flags; | |
585 | fl4->flowi4_tos = orig_tos; | |
586 | fl4->flowi4_scope = scope; | |
b5bdacf3 DA |
587 | |
588 | return rc; | |
8cbb512c DA |
589 | } |
590 | ||
74b20582 DA |
591 | #if IS_ENABLED(CONFIG_IPV6) |
592 | /* neighbor handling is done with actual device; do not want | |
593 | * to flip skb->dev for those ndisc packets. This really fails | |
594 | * for multiple next protocols (e.g., NEXTHDR_HOP). But it is | |
595 | * a start. | |
596 | */ | |
597 | static bool ipv6_ndisc_frame(const struct sk_buff *skb) | |
598 | { | |
599 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
600 | bool rc = false; | |
601 | ||
602 | if (iph->nexthdr == NEXTHDR_ICMP) { | |
603 | const struct icmp6hdr *icmph; | |
604 | struct icmp6hdr _icmph; | |
605 | ||
606 | icmph = skb_header_pointer(skb, sizeof(*iph), | |
607 | sizeof(_icmph), &_icmph); | |
608 | if (!icmph) | |
609 | goto out; | |
610 | ||
611 | switch (icmph->icmp6_type) { | |
612 | case NDISC_ROUTER_SOLICITATION: | |
613 | case NDISC_ROUTER_ADVERTISEMENT: | |
614 | case NDISC_NEIGHBOUR_SOLICITATION: | |
615 | case NDISC_NEIGHBOUR_ADVERTISEMENT: | |
616 | case NDISC_REDIRECT: | |
617 | rc = true; | |
618 | break; | |
619 | } | |
620 | } | |
621 | ||
622 | out: | |
623 | return rc; | |
624 | } | |
625 | ||
626 | static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev, | |
627 | struct sk_buff *skb) | |
628 | { | |
629 | /* if packet is NDISC keep the ingress interface */ | |
630 | if (!ipv6_ndisc_frame(skb)) { | |
631 | skb->dev = vrf_dev; | |
632 | skb->skb_iif = vrf_dev->ifindex; | |
633 | ||
634 | skb_push(skb, skb->mac_len); | |
635 | dev_queue_xmit_nit(skb, vrf_dev); | |
636 | skb_pull(skb, skb->mac_len); | |
637 | ||
638 | IP6CB(skb)->flags |= IP6SKB_L3SLAVE; | |
639 | } | |
640 | ||
641 | return skb; | |
642 | } | |
643 | ||
644 | #else | |
645 | static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev, | |
646 | struct sk_buff *skb) | |
647 | { | |
648 | return skb; | |
649 | } | |
650 | #endif | |
651 | ||
652 | static struct sk_buff *vrf_ip_rcv(struct net_device *vrf_dev, | |
653 | struct sk_buff *skb) | |
654 | { | |
655 | skb->dev = vrf_dev; | |
656 | skb->skb_iif = vrf_dev->ifindex; | |
657 | ||
658 | skb_push(skb, skb->mac_len); | |
659 | dev_queue_xmit_nit(skb, vrf_dev); | |
660 | skb_pull(skb, skb->mac_len); | |
661 | ||
662 | return skb; | |
663 | } | |
664 | ||
665 | /* called with rcu lock held */ | |
666 | static struct sk_buff *vrf_l3_rcv(struct net_device *vrf_dev, | |
667 | struct sk_buff *skb, | |
668 | u16 proto) | |
669 | { | |
670 | switch (proto) { | |
671 | case AF_INET: | |
672 | return vrf_ip_rcv(vrf_dev, skb); | |
673 | case AF_INET6: | |
674 | return vrf_ip6_rcv(vrf_dev, skb); | |
675 | } | |
676 | ||
677 | return skb; | |
678 | } | |
679 | ||
35402e31 DA |
680 | #if IS_ENABLED(CONFIG_IPV6) |
681 | static struct dst_entry *vrf_get_rt6_dst(const struct net_device *dev, | |
682 | const struct flowi6 *fl6) | |
683 | { | |
b0e95ccd | 684 | struct dst_entry *dst = NULL; |
35402e31 DA |
685 | |
686 | if (!(fl6->flowi6_flags & FLOWI_FLAG_L3MDEV_SRC)) { | |
687 | struct net_vrf *vrf = netdev_priv(dev); | |
b0e95ccd DA |
688 | struct rt6_info *rt; |
689 | ||
690 | rcu_read_lock(); | |
691 | ||
692 | rt = rcu_dereference(vrf->rt6); | |
693 | if (likely(rt)) { | |
694 | dst = &rt->dst; | |
695 | dst_hold(dst); | |
696 | } | |
35402e31 | 697 | |
b0e95ccd | 698 | rcu_read_unlock(); |
35402e31 DA |
699 | } |
700 | ||
b0e95ccd | 701 | return dst; |
35402e31 DA |
702 | } |
703 | #endif | |
704 | ||
ee15ee5d DA |
705 | static const struct l3mdev_ops vrf_l3mdev_ops = { |
706 | .l3mdev_fib_table = vrf_fib_table, | |
707 | .l3mdev_get_rtable = vrf_get_rtable, | |
8cbb512c | 708 | .l3mdev_get_saddr = vrf_get_saddr, |
74b20582 | 709 | .l3mdev_l3_rcv = vrf_l3_rcv, |
35402e31 DA |
710 | #if IS_ENABLED(CONFIG_IPV6) |
711 | .l3mdev_get_rt6_dst = vrf_get_rt6_dst, | |
712 | #endif | |
ee15ee5d DA |
713 | }; |
714 | ||
193125db DA |
715 | static void vrf_get_drvinfo(struct net_device *dev, |
716 | struct ethtool_drvinfo *info) | |
717 | { | |
718 | strlcpy(info->driver, DRV_NAME, sizeof(info->driver)); | |
719 | strlcpy(info->version, DRV_VERSION, sizeof(info->version)); | |
720 | } | |
721 | ||
722 | static const struct ethtool_ops vrf_ethtool_ops = { | |
723 | .get_drvinfo = vrf_get_drvinfo, | |
724 | }; | |
725 | ||
726 | static void vrf_setup(struct net_device *dev) | |
727 | { | |
728 | ether_setup(dev); | |
729 | ||
730 | /* Initialize the device structure. */ | |
731 | dev->netdev_ops = &vrf_netdev_ops; | |
ee15ee5d | 732 | dev->l3mdev_ops = &vrf_l3mdev_ops; |
193125db DA |
733 | dev->ethtool_ops = &vrf_ethtool_ops; |
734 | dev->destructor = free_netdev; | |
735 | ||
736 | /* Fill in device structure with ethernet-generic values. */ | |
737 | eth_hw_addr_random(dev); | |
738 | ||
739 | /* don't acquire vrf device's netif_tx_lock when transmitting */ | |
740 | dev->features |= NETIF_F_LLTX; | |
741 | ||
742 | /* don't allow vrf devices to change network namespaces. */ | |
743 | dev->features |= NETIF_F_NETNS_LOCAL; | |
744 | } | |
745 | ||
746 | static int vrf_validate(struct nlattr *tb[], struct nlattr *data[]) | |
747 | { | |
748 | if (tb[IFLA_ADDRESS]) { | |
749 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) | |
750 | return -EINVAL; | |
751 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) | |
752 | return -EADDRNOTAVAIL; | |
753 | } | |
754 | return 0; | |
755 | } | |
756 | ||
757 | static void vrf_dellink(struct net_device *dev, struct list_head *head) | |
758 | { | |
193125db DA |
759 | unregister_netdevice_queue(dev, head); |
760 | } | |
761 | ||
762 | static int vrf_newlink(struct net *src_net, struct net_device *dev, | |
763 | struct nlattr *tb[], struct nlattr *data[]) | |
764 | { | |
765 | struct net_vrf *vrf = netdev_priv(dev); | |
193125db DA |
766 | |
767 | if (!data || !data[IFLA_VRF_TABLE]) | |
768 | return -EINVAL; | |
769 | ||
770 | vrf->tb_id = nla_get_u32(data[IFLA_VRF_TABLE]); | |
771 | ||
007979ea | 772 | dev->priv_flags |= IFF_L3MDEV_MASTER; |
193125db | 773 | |
7f109f7c | 774 | return register_netdevice(dev); |
193125db DA |
775 | } |
776 | ||
777 | static size_t vrf_nl_getsize(const struct net_device *dev) | |
778 | { | |
779 | return nla_total_size(sizeof(u32)); /* IFLA_VRF_TABLE */ | |
780 | } | |
781 | ||
782 | static int vrf_fillinfo(struct sk_buff *skb, | |
783 | const struct net_device *dev) | |
784 | { | |
785 | struct net_vrf *vrf = netdev_priv(dev); | |
786 | ||
787 | return nla_put_u32(skb, IFLA_VRF_TABLE, vrf->tb_id); | |
788 | } | |
789 | ||
67eb0331 DA |
790 | static size_t vrf_get_slave_size(const struct net_device *bond_dev, |
791 | const struct net_device *slave_dev) | |
792 | { | |
793 | return nla_total_size(sizeof(u32)); /* IFLA_VRF_PORT_TABLE */ | |
794 | } | |
795 | ||
796 | static int vrf_fill_slave_info(struct sk_buff *skb, | |
797 | const struct net_device *vrf_dev, | |
798 | const struct net_device *slave_dev) | |
799 | { | |
800 | struct net_vrf *vrf = netdev_priv(vrf_dev); | |
801 | ||
802 | if (nla_put_u32(skb, IFLA_VRF_PORT_TABLE, vrf->tb_id)) | |
803 | return -EMSGSIZE; | |
804 | ||
805 | return 0; | |
806 | } | |
807 | ||
193125db DA |
808 | static const struct nla_policy vrf_nl_policy[IFLA_VRF_MAX + 1] = { |
809 | [IFLA_VRF_TABLE] = { .type = NLA_U32 }, | |
810 | }; | |
811 | ||
812 | static struct rtnl_link_ops vrf_link_ops __read_mostly = { | |
813 | .kind = DRV_NAME, | |
814 | .priv_size = sizeof(struct net_vrf), | |
815 | ||
816 | .get_size = vrf_nl_getsize, | |
817 | .policy = vrf_nl_policy, | |
818 | .validate = vrf_validate, | |
819 | .fill_info = vrf_fillinfo, | |
820 | ||
67eb0331 DA |
821 | .get_slave_size = vrf_get_slave_size, |
822 | .fill_slave_info = vrf_fill_slave_info, | |
823 | ||
193125db DA |
824 | .newlink = vrf_newlink, |
825 | .dellink = vrf_dellink, | |
826 | .setup = vrf_setup, | |
827 | .maxtype = IFLA_VRF_MAX, | |
828 | }; | |
829 | ||
830 | static int vrf_device_event(struct notifier_block *unused, | |
831 | unsigned long event, void *ptr) | |
832 | { | |
833 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
834 | ||
835 | /* only care about unregister events to drop slave references */ | |
836 | if (event == NETDEV_UNREGISTER) { | |
193125db DA |
837 | struct net_device *vrf_dev; |
838 | ||
fee6d4c7 | 839 | if (!netif_is_l3_slave(dev)) |
193125db DA |
840 | goto out; |
841 | ||
58aa9087 NA |
842 | vrf_dev = netdev_master_upper_dev_get(dev); |
843 | vrf_del_slave(vrf_dev, dev); | |
193125db DA |
844 | } |
845 | out: | |
846 | return NOTIFY_DONE; | |
847 | } | |
848 | ||
849 | static struct notifier_block vrf_notifier_block __read_mostly = { | |
850 | .notifier_call = vrf_device_event, | |
851 | }; | |
852 | ||
853 | static int __init vrf_init_module(void) | |
854 | { | |
855 | int rc; | |
856 | ||
193125db DA |
857 | register_netdevice_notifier(&vrf_notifier_block); |
858 | ||
859 | rc = rtnl_link_register(&vrf_link_ops); | |
860 | if (rc < 0) | |
861 | goto error; | |
862 | ||
863 | return 0; | |
864 | ||
865 | error: | |
866 | unregister_netdevice_notifier(&vrf_notifier_block); | |
193125db DA |
867 | return rc; |
868 | } | |
869 | ||
193125db | 870 | module_init(vrf_init_module); |
193125db DA |
871 | MODULE_AUTHOR("Shrijeet Mukherjee, David Ahern"); |
872 | MODULE_DESCRIPTION("Device driver to instantiate VRF domains"); | |
873 | MODULE_LICENSE("GPL"); | |
874 | MODULE_ALIAS_RTNL_LINK(DRV_NAME); | |
875 | MODULE_VERSION(DRV_VERSION); |