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> | |
33 | #include <net/ip6_route.h> | |
34 | #include <net/rtnetlink.h> | |
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 DA |
48 | struct slave { |
49 | struct list_head list; | |
50 | struct net_device *dev; | |
51 | }; | |
52 | ||
53 | struct slave_queue { | |
54 | struct list_head all_slaves; | |
55 | }; | |
56 | ||
57 | struct net_vrf { | |
58 | struct slave_queue queue; | |
59 | struct rtable *rth; | |
60 | u32 tb_id; | |
61 | }; | |
62 | ||
193125db DA |
63 | struct pcpu_dstats { |
64 | u64 tx_pkts; | |
65 | u64 tx_bytes; | |
66 | u64 tx_drps; | |
67 | u64 rx_pkts; | |
68 | u64 rx_bytes; | |
69 | struct u64_stats_sync syncp; | |
70 | }; | |
71 | ||
72 | static struct dst_entry *vrf_ip_check(struct dst_entry *dst, u32 cookie) | |
73 | { | |
74 | return dst; | |
75 | } | |
76 | ||
4ebdfba7 | 77 | static int vrf_ip_local_out(struct sock *sk, struct sk_buff *skb) |
193125db | 78 | { |
4ebdfba7 | 79 | return ip_local_out_sk(sk, skb); |
193125db DA |
80 | } |
81 | ||
82 | static unsigned int vrf_v4_mtu(const struct dst_entry *dst) | |
83 | { | |
84 | /* TO-DO: return max ethernet size? */ | |
85 | return dst->dev->mtu; | |
86 | } | |
87 | ||
88 | static void vrf_dst_destroy(struct dst_entry *dst) | |
89 | { | |
90 | /* our dst lives forever - or until the device is closed */ | |
91 | } | |
92 | ||
93 | static unsigned int vrf_default_advmss(const struct dst_entry *dst) | |
94 | { | |
95 | return 65535 - 40; | |
96 | } | |
97 | ||
98 | static struct dst_ops vrf_dst_ops = { | |
99 | .family = AF_INET, | |
100 | .local_out = vrf_ip_local_out, | |
101 | .check = vrf_ip_check, | |
102 | .mtu = vrf_v4_mtu, | |
103 | .destroy = vrf_dst_destroy, | |
104 | .default_advmss = vrf_default_advmss, | |
105 | }; | |
106 | ||
107 | static bool is_ip_rx_frame(struct sk_buff *skb) | |
108 | { | |
109 | switch (skb->protocol) { | |
110 | case htons(ETH_P_IP): | |
111 | case htons(ETH_P_IPV6): | |
112 | return true; | |
113 | } | |
114 | return false; | |
115 | } | |
116 | ||
57b8efa1 NA |
117 | static void vrf_tx_error(struct net_device *vrf_dev, struct sk_buff *skb) |
118 | { | |
119 | vrf_dev->stats.tx_errors++; | |
120 | kfree_skb(skb); | |
121 | } | |
122 | ||
193125db DA |
123 | /* note: already called with rcu_read_lock */ |
124 | static rx_handler_result_t vrf_handle_frame(struct sk_buff **pskb) | |
125 | { | |
126 | struct sk_buff *skb = *pskb; | |
127 | ||
128 | if (is_ip_rx_frame(skb)) { | |
129 | struct net_device *dev = vrf_master_get_rcu(skb->dev); | |
130 | struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats); | |
131 | ||
132 | u64_stats_update_begin(&dstats->syncp); | |
133 | dstats->rx_pkts++; | |
134 | dstats->rx_bytes += skb->len; | |
135 | u64_stats_update_end(&dstats->syncp); | |
136 | ||
137 | skb->dev = dev; | |
138 | ||
139 | return RX_HANDLER_ANOTHER; | |
140 | } | |
141 | return RX_HANDLER_PASS; | |
142 | } | |
143 | ||
144 | static struct rtnl_link_stats64 *vrf_get_stats64(struct net_device *dev, | |
145 | struct rtnl_link_stats64 *stats) | |
146 | { | |
147 | int i; | |
148 | ||
149 | for_each_possible_cpu(i) { | |
150 | const struct pcpu_dstats *dstats; | |
151 | u64 tbytes, tpkts, tdrops, rbytes, rpkts; | |
152 | unsigned int start; | |
153 | ||
154 | dstats = per_cpu_ptr(dev->dstats, i); | |
155 | do { | |
156 | start = u64_stats_fetch_begin_irq(&dstats->syncp); | |
157 | tbytes = dstats->tx_bytes; | |
158 | tpkts = dstats->tx_pkts; | |
159 | tdrops = dstats->tx_drps; | |
160 | rbytes = dstats->rx_bytes; | |
161 | rpkts = dstats->rx_pkts; | |
162 | } while (u64_stats_fetch_retry_irq(&dstats->syncp, start)); | |
163 | stats->tx_bytes += tbytes; | |
164 | stats->tx_packets += tpkts; | |
165 | stats->tx_dropped += tdrops; | |
166 | stats->rx_bytes += rbytes; | |
167 | stats->rx_packets += rpkts; | |
168 | } | |
169 | return stats; | |
170 | } | |
171 | ||
172 | static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb, | |
173 | struct net_device *dev) | |
174 | { | |
57b8efa1 NA |
175 | vrf_tx_error(dev, skb); |
176 | return NET_XMIT_DROP; | |
193125db DA |
177 | } |
178 | ||
179 | static int vrf_send_v4_prep(struct sk_buff *skb, struct flowi4 *fl4, | |
180 | struct net_device *vrf_dev) | |
181 | { | |
182 | struct rtable *rt; | |
183 | int err = 1; | |
184 | ||
185 | rt = ip_route_output_flow(dev_net(vrf_dev), fl4, NULL); | |
186 | if (IS_ERR(rt)) | |
187 | goto out; | |
188 | ||
189 | /* TO-DO: what about broadcast ? */ | |
190 | if (rt->rt_type != RTN_UNICAST && rt->rt_type != RTN_LOCAL) { | |
191 | ip_rt_put(rt); | |
192 | goto out; | |
193 | } | |
194 | ||
195 | skb_dst_drop(skb); | |
196 | skb_dst_set(skb, &rt->dst); | |
197 | err = 0; | |
198 | out: | |
199 | return err; | |
200 | } | |
201 | ||
202 | static netdev_tx_t vrf_process_v4_outbound(struct sk_buff *skb, | |
203 | struct net_device *vrf_dev) | |
204 | { | |
205 | struct iphdr *ip4h = ip_hdr(skb); | |
206 | int ret = NET_XMIT_DROP; | |
207 | struct flowi4 fl4 = { | |
208 | /* needed to match OIF rule */ | |
209 | .flowi4_oif = vrf_dev->ifindex, | |
210 | .flowi4_iif = LOOPBACK_IFINDEX, | |
211 | .flowi4_tos = RT_TOS(ip4h->tos), | |
6e2895a8 | 212 | .flowi4_flags = FLOWI_FLAG_ANYSRC | FLOWI_FLAG_L3MDEV_SRC | |
58189ca7 | 213 | FLOWI_FLAG_SKIP_NH_OIF, |
193125db DA |
214 | .daddr = ip4h->daddr, |
215 | }; | |
216 | ||
217 | if (vrf_send_v4_prep(skb, &fl4, vrf_dev)) | |
218 | goto err; | |
219 | ||
220 | if (!ip4h->saddr) { | |
221 | ip4h->saddr = inet_select_addr(skb_dst(skb)->dev, 0, | |
222 | RT_SCOPE_LINK); | |
223 | } | |
224 | ||
225 | ret = ip_local_out(skb); | |
226 | if (unlikely(net_xmit_eval(ret))) | |
227 | vrf_dev->stats.tx_errors++; | |
228 | else | |
229 | ret = NET_XMIT_SUCCESS; | |
230 | ||
231 | out: | |
232 | return ret; | |
233 | err: | |
57b8efa1 | 234 | vrf_tx_error(vrf_dev, skb); |
193125db DA |
235 | goto out; |
236 | } | |
237 | ||
238 | static netdev_tx_t is_ip_tx_frame(struct sk_buff *skb, struct net_device *dev) | |
239 | { | |
8f58336d DA |
240 | /* strip the ethernet header added for pass through VRF device */ |
241 | __skb_pull(skb, skb_network_offset(skb)); | |
242 | ||
193125db DA |
243 | switch (skb->protocol) { |
244 | case htons(ETH_P_IP): | |
245 | return vrf_process_v4_outbound(skb, dev); | |
246 | case htons(ETH_P_IPV6): | |
247 | return vrf_process_v6_outbound(skb, dev); | |
248 | default: | |
57b8efa1 | 249 | vrf_tx_error(dev, skb); |
193125db DA |
250 | return NET_XMIT_DROP; |
251 | } | |
252 | } | |
253 | ||
254 | static netdev_tx_t vrf_xmit(struct sk_buff *skb, struct net_device *dev) | |
255 | { | |
256 | netdev_tx_t ret = is_ip_tx_frame(skb, dev); | |
257 | ||
258 | if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { | |
259 | struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats); | |
260 | ||
261 | u64_stats_update_begin(&dstats->syncp); | |
262 | dstats->tx_pkts++; | |
263 | dstats->tx_bytes += skb->len; | |
264 | u64_stats_update_end(&dstats->syncp); | |
265 | } else { | |
266 | this_cpu_inc(dev->dstats->tx_drps); | |
267 | } | |
268 | ||
269 | return ret; | |
270 | } | |
271 | ||
8f58336d | 272 | /* modelled after ip_finish_output2 */ |
0c4b51f0 | 273 | static int vrf_finish_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
193125db | 274 | { |
8f58336d DA |
275 | struct dst_entry *dst = skb_dst(skb); |
276 | struct rtable *rt = (struct rtable *)dst; | |
277 | struct net_device *dev = dst->dev; | |
278 | unsigned int hh_len = LL_RESERVED_SPACE(dev); | |
279 | struct neighbour *neigh; | |
280 | u32 nexthop; | |
281 | int ret = -EINVAL; | |
282 | ||
283 | /* Be paranoid, rather than too clever. */ | |
284 | if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) { | |
285 | struct sk_buff *skb2; | |
286 | ||
287 | skb2 = skb_realloc_headroom(skb, LL_RESERVED_SPACE(dev)); | |
288 | if (!skb2) { | |
289 | ret = -ENOMEM; | |
290 | goto err; | |
291 | } | |
292 | if (skb->sk) | |
293 | skb_set_owner_w(skb2, skb->sk); | |
294 | ||
295 | consume_skb(skb); | |
296 | skb = skb2; | |
297 | } | |
298 | ||
299 | rcu_read_lock_bh(); | |
300 | ||
301 | nexthop = (__force u32)rt_nexthop(rt, ip_hdr(skb)->daddr); | |
302 | neigh = __ipv4_neigh_lookup_noref(dev, nexthop); | |
303 | if (unlikely(!neigh)) | |
304 | neigh = __neigh_create(&arp_tbl, &nexthop, dev, false); | |
305 | if (!IS_ERR(neigh)) | |
306 | ret = dst_neigh_output(dst, neigh, skb); | |
307 | ||
308 | rcu_read_unlock_bh(); | |
309 | err: | |
310 | if (unlikely(ret < 0)) | |
311 | vrf_tx_error(skb->dev, skb); | |
312 | return ret; | |
193125db DA |
313 | } |
314 | ||
315 | static int vrf_output(struct sock *sk, struct sk_buff *skb) | |
316 | { | |
317 | struct net_device *dev = skb_dst(skb)->dev; | |
29a26a56 | 318 | struct net *net = dev_net(dev); |
193125db | 319 | |
29a26a56 | 320 | IP_UPD_PO_STATS(net, IPSTATS_MIB_OUT, skb->len); |
193125db DA |
321 | |
322 | skb->dev = dev; | |
323 | skb->protocol = htons(ETH_P_IP); | |
324 | ||
29a26a56 EB |
325 | return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING, |
326 | net, sk, skb, NULL, dev, | |
8f58336d | 327 | vrf_finish_output, |
193125db DA |
328 | !(IPCB(skb)->flags & IPSKB_REROUTED)); |
329 | } | |
330 | ||
331 | static void vrf_rtable_destroy(struct net_vrf *vrf) | |
332 | { | |
333 | struct dst_entry *dst = (struct dst_entry *)vrf->rth; | |
334 | ||
3a4a27d3 | 335 | dst_destroy(dst); |
193125db DA |
336 | vrf->rth = NULL; |
337 | } | |
338 | ||
339 | static struct rtable *vrf_rtable_create(struct net_device *dev) | |
340 | { | |
b7503e0c | 341 | struct net_vrf *vrf = netdev_priv(dev); |
193125db DA |
342 | struct rtable *rth; |
343 | ||
344 | rth = dst_alloc(&vrf_dst_ops, dev, 2, | |
345 | DST_OBSOLETE_NONE, | |
346 | (DST_HOST | DST_NOPOLICY | DST_NOXFRM)); | |
347 | if (rth) { | |
348 | rth->dst.output = vrf_output; | |
349 | rth->rt_genid = rt_genid_ipv4(dev_net(dev)); | |
350 | rth->rt_flags = 0; | |
351 | rth->rt_type = RTN_UNICAST; | |
352 | rth->rt_is_input = 0; | |
353 | rth->rt_iif = 0; | |
354 | rth->rt_pmtu = 0; | |
355 | rth->rt_gateway = 0; | |
356 | rth->rt_uses_gateway = 0; | |
b7503e0c | 357 | rth->rt_table_id = vrf->tb_id; |
193125db DA |
358 | INIT_LIST_HEAD(&rth->rt_uncached); |
359 | rth->rt_uncached_list = NULL; | |
193125db DA |
360 | } |
361 | ||
362 | return rth; | |
363 | } | |
364 | ||
365 | /**************************** device handling ********************/ | |
366 | ||
367 | /* cycle interface to flush neighbor cache and move routes across tables */ | |
368 | static void cycle_netdev(struct net_device *dev) | |
369 | { | |
370 | unsigned int flags = dev->flags; | |
371 | int ret; | |
372 | ||
373 | if (!netif_running(dev)) | |
374 | return; | |
375 | ||
376 | ret = dev_change_flags(dev, flags & ~IFF_UP); | |
377 | if (ret >= 0) | |
378 | ret = dev_change_flags(dev, flags); | |
379 | ||
380 | if (ret < 0) { | |
381 | netdev_err(dev, | |
382 | "Failed to cycle device %s; route tables might be wrong!\n", | |
383 | dev->name); | |
384 | } | |
385 | } | |
386 | ||
387 | static struct slave *__vrf_find_slave_dev(struct slave_queue *queue, | |
388 | struct net_device *dev) | |
389 | { | |
390 | struct list_head *head = &queue->all_slaves; | |
391 | struct slave *slave; | |
392 | ||
393 | list_for_each_entry(slave, head, list) { | |
394 | if (slave->dev == dev) | |
395 | return slave; | |
396 | } | |
397 | ||
398 | return NULL; | |
399 | } | |
400 | ||
401 | /* inverse of __vrf_insert_slave */ | |
402 | static void __vrf_remove_slave(struct slave_queue *queue, struct slave *slave) | |
403 | { | |
193125db | 404 | list_del(&slave->list); |
193125db DA |
405 | } |
406 | ||
407 | static void __vrf_insert_slave(struct slave_queue *queue, struct slave *slave) | |
408 | { | |
193125db | 409 | list_add(&slave->list, &queue->all_slaves); |
193125db DA |
410 | } |
411 | ||
412 | static int do_vrf_add_slave(struct net_device *dev, struct net_device *port_dev) | |
413 | { | |
193125db | 414 | struct slave *slave = kzalloc(sizeof(*slave), GFP_KERNEL); |
193125db DA |
415 | struct net_vrf *vrf = netdev_priv(dev); |
416 | struct slave_queue *queue = &vrf->queue; | |
417 | int ret = -ENOMEM; | |
418 | ||
93a7e7e8 | 419 | if (!slave) |
193125db DA |
420 | goto out_fail; |
421 | ||
422 | slave->dev = port_dev; | |
193125db | 423 | |
193125db DA |
424 | /* register the packet handler for slave ports */ |
425 | ret = netdev_rx_handler_register(port_dev, vrf_handle_frame, dev); | |
426 | if (ret) { | |
427 | netdev_err(port_dev, | |
428 | "Device %s failed to register rx_handler\n", | |
429 | port_dev->name); | |
15df5e71 | 430 | goto out_fail; |
193125db DA |
431 | } |
432 | ||
433 | ret = netdev_master_upper_dev_link(port_dev, dev); | |
434 | if (ret < 0) | |
435 | goto out_unregister; | |
436 | ||
fee6d4c7 | 437 | port_dev->priv_flags |= IFF_L3MDEV_SLAVE; |
15df5e71 | 438 | __vrf_insert_slave(queue, slave); |
193125db DA |
439 | cycle_netdev(port_dev); |
440 | ||
441 | return 0; | |
442 | ||
443 | out_unregister: | |
444 | netdev_rx_handler_unregister(port_dev); | |
193125db | 445 | out_fail: |
193125db DA |
446 | kfree(slave); |
447 | return ret; | |
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 DA |
461 | struct net_vrf *vrf = netdev_priv(dev); |
462 | struct slave_queue *queue = &vrf->queue; | |
463 | struct slave *slave; | |
464 | ||
193125db | 465 | netdev_upper_dev_unlink(port_dev, dev); |
fee6d4c7 | 466 | port_dev->priv_flags &= ~IFF_L3MDEV_SLAVE; |
193125db DA |
467 | |
468 | netdev_rx_handler_unregister(port_dev); | |
469 | ||
193125db DA |
470 | cycle_netdev(port_dev); |
471 | ||
472 | slave = __vrf_find_slave_dev(queue, port_dev); | |
473 | if (slave) | |
474 | __vrf_remove_slave(queue, slave); | |
475 | ||
476 | kfree(slave); | |
477 | ||
478 | return 0; | |
479 | } | |
480 | ||
481 | static int vrf_del_slave(struct net_device *dev, struct net_device *port_dev) | |
482 | { | |
193125db DA |
483 | return do_vrf_del_slave(dev, port_dev); |
484 | } | |
485 | ||
486 | static void vrf_dev_uninit(struct net_device *dev) | |
487 | { | |
488 | struct net_vrf *vrf = netdev_priv(dev); | |
489 | struct slave_queue *queue = &vrf->queue; | |
490 | struct list_head *head = &queue->all_slaves; | |
491 | struct slave *slave, *next; | |
492 | ||
493 | vrf_rtable_destroy(vrf); | |
494 | ||
495 | list_for_each_entry_safe(slave, next, head, list) | |
496 | vrf_del_slave(dev, slave->dev); | |
497 | ||
3a4a27d3 | 498 | free_percpu(dev->dstats); |
193125db DA |
499 | dev->dstats = NULL; |
500 | } | |
501 | ||
502 | static int vrf_dev_init(struct net_device *dev) | |
503 | { | |
504 | struct net_vrf *vrf = netdev_priv(dev); | |
505 | ||
506 | INIT_LIST_HEAD(&vrf->queue.all_slaves); | |
507 | ||
508 | dev->dstats = netdev_alloc_pcpu_stats(struct pcpu_dstats); | |
509 | if (!dev->dstats) | |
510 | goto out_nomem; | |
511 | ||
512 | /* create the default dst which points back to us */ | |
513 | vrf->rth = vrf_rtable_create(dev); | |
514 | if (!vrf->rth) | |
515 | goto out_stats; | |
516 | ||
517 | dev->flags = IFF_MASTER | IFF_NOARP; | |
518 | ||
519 | return 0; | |
520 | ||
521 | out_stats: | |
522 | free_percpu(dev->dstats); | |
523 | dev->dstats = NULL; | |
524 | out_nomem: | |
525 | return -ENOMEM; | |
526 | } | |
527 | ||
528 | static const struct net_device_ops vrf_netdev_ops = { | |
529 | .ndo_init = vrf_dev_init, | |
530 | .ndo_uninit = vrf_dev_uninit, | |
531 | .ndo_start_xmit = vrf_xmit, | |
532 | .ndo_get_stats64 = vrf_get_stats64, | |
533 | .ndo_add_slave = vrf_add_slave, | |
534 | .ndo_del_slave = vrf_del_slave, | |
535 | }; | |
536 | ||
ee15ee5d DA |
537 | static u32 vrf_fib_table(const struct net_device *dev) |
538 | { | |
539 | struct net_vrf *vrf = netdev_priv(dev); | |
540 | ||
541 | return vrf->tb_id; | |
542 | } | |
543 | ||
544 | static struct rtable *vrf_get_rtable(const struct net_device *dev, | |
545 | const struct flowi4 *fl4) | |
546 | { | |
547 | struct rtable *rth = NULL; | |
548 | ||
6e2895a8 | 549 | if (!(fl4->flowi4_flags & FLOWI_FLAG_L3MDEV_SRC)) { |
ee15ee5d DA |
550 | struct net_vrf *vrf = netdev_priv(dev); |
551 | ||
552 | rth = vrf->rth; | |
553 | atomic_inc(&rth->dst.__refcnt); | |
554 | } | |
555 | ||
556 | return rth; | |
557 | } | |
558 | ||
8cbb512c DA |
559 | /* called under rcu_read_lock */ |
560 | static void vrf_get_saddr(struct net_device *dev, struct flowi4 *fl4) | |
561 | { | |
562 | struct fib_result res = { .tclassid = 0 }; | |
563 | struct net *net = dev_net(dev); | |
564 | u32 orig_tos = fl4->flowi4_tos; | |
565 | u8 flags = fl4->flowi4_flags; | |
566 | u8 scope = fl4->flowi4_scope; | |
567 | u8 tos = RT_FL_TOS(fl4); | |
568 | ||
569 | if (unlikely(!fl4->daddr)) | |
570 | return; | |
571 | ||
572 | fl4->flowi4_flags |= FLOWI_FLAG_SKIP_NH_OIF; | |
573 | fl4->flowi4_iif = LOOPBACK_IFINDEX; | |
574 | fl4->flowi4_tos = tos & IPTOS_RT_MASK; | |
575 | fl4->flowi4_scope = ((tos & RTO_ONLINK) ? | |
576 | RT_SCOPE_LINK : RT_SCOPE_UNIVERSE); | |
577 | ||
578 | if (!fib_lookup(net, fl4, &res, 0)) { | |
579 | if (res.type == RTN_LOCAL) | |
580 | fl4->saddr = res.fi->fib_prefsrc ? : fl4->daddr; | |
581 | else | |
582 | fib_select_path(net, &res, fl4, -1); | |
583 | } | |
584 | ||
585 | fl4->flowi4_flags = flags; | |
586 | fl4->flowi4_tos = orig_tos; | |
587 | fl4->flowi4_scope = scope; | |
588 | } | |
589 | ||
ee15ee5d DA |
590 | static const struct l3mdev_ops vrf_l3mdev_ops = { |
591 | .l3mdev_fib_table = vrf_fib_table, | |
592 | .l3mdev_get_rtable = vrf_get_rtable, | |
8cbb512c | 593 | .l3mdev_get_saddr = vrf_get_saddr, |
ee15ee5d DA |
594 | }; |
595 | ||
193125db DA |
596 | static void vrf_get_drvinfo(struct net_device *dev, |
597 | struct ethtool_drvinfo *info) | |
598 | { | |
599 | strlcpy(info->driver, DRV_NAME, sizeof(info->driver)); | |
600 | strlcpy(info->version, DRV_VERSION, sizeof(info->version)); | |
601 | } | |
602 | ||
603 | static const struct ethtool_ops vrf_ethtool_ops = { | |
604 | .get_drvinfo = vrf_get_drvinfo, | |
605 | }; | |
606 | ||
607 | static void vrf_setup(struct net_device *dev) | |
608 | { | |
609 | ether_setup(dev); | |
610 | ||
611 | /* Initialize the device structure. */ | |
612 | dev->netdev_ops = &vrf_netdev_ops; | |
ee15ee5d | 613 | dev->l3mdev_ops = &vrf_l3mdev_ops; |
193125db DA |
614 | dev->ethtool_ops = &vrf_ethtool_ops; |
615 | dev->destructor = free_netdev; | |
616 | ||
617 | /* Fill in device structure with ethernet-generic values. */ | |
618 | eth_hw_addr_random(dev); | |
619 | ||
620 | /* don't acquire vrf device's netif_tx_lock when transmitting */ | |
621 | dev->features |= NETIF_F_LLTX; | |
622 | ||
623 | /* don't allow vrf devices to change network namespaces. */ | |
624 | dev->features |= NETIF_F_NETNS_LOCAL; | |
625 | } | |
626 | ||
627 | static int vrf_validate(struct nlattr *tb[], struct nlattr *data[]) | |
628 | { | |
629 | if (tb[IFLA_ADDRESS]) { | |
630 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) | |
631 | return -EINVAL; | |
632 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) | |
633 | return -EADDRNOTAVAIL; | |
634 | } | |
635 | return 0; | |
636 | } | |
637 | ||
638 | static void vrf_dellink(struct net_device *dev, struct list_head *head) | |
639 | { | |
193125db DA |
640 | unregister_netdevice_queue(dev, head); |
641 | } | |
642 | ||
643 | static int vrf_newlink(struct net *src_net, struct net_device *dev, | |
644 | struct nlattr *tb[], struct nlattr *data[]) | |
645 | { | |
646 | struct net_vrf *vrf = netdev_priv(dev); | |
193125db DA |
647 | int err; |
648 | ||
649 | if (!data || !data[IFLA_VRF_TABLE]) | |
650 | return -EINVAL; | |
651 | ||
652 | vrf->tb_id = nla_get_u32(data[IFLA_VRF_TABLE]); | |
653 | ||
007979ea | 654 | dev->priv_flags |= IFF_L3MDEV_MASTER; |
193125db | 655 | |
193125db DA |
656 | err = register_netdevice(dev); |
657 | if (err < 0) | |
658 | goto out_fail; | |
659 | ||
193125db DA |
660 | return 0; |
661 | ||
662 | out_fail: | |
193125db DA |
663 | free_netdev(dev); |
664 | return err; | |
665 | } | |
666 | ||
667 | static size_t vrf_nl_getsize(const struct net_device *dev) | |
668 | { | |
669 | return nla_total_size(sizeof(u32)); /* IFLA_VRF_TABLE */ | |
670 | } | |
671 | ||
672 | static int vrf_fillinfo(struct sk_buff *skb, | |
673 | const struct net_device *dev) | |
674 | { | |
675 | struct net_vrf *vrf = netdev_priv(dev); | |
676 | ||
677 | return nla_put_u32(skb, IFLA_VRF_TABLE, vrf->tb_id); | |
678 | } | |
679 | ||
680 | static const struct nla_policy vrf_nl_policy[IFLA_VRF_MAX + 1] = { | |
681 | [IFLA_VRF_TABLE] = { .type = NLA_U32 }, | |
682 | }; | |
683 | ||
684 | static struct rtnl_link_ops vrf_link_ops __read_mostly = { | |
685 | .kind = DRV_NAME, | |
686 | .priv_size = sizeof(struct net_vrf), | |
687 | ||
688 | .get_size = vrf_nl_getsize, | |
689 | .policy = vrf_nl_policy, | |
690 | .validate = vrf_validate, | |
691 | .fill_info = vrf_fillinfo, | |
692 | ||
693 | .newlink = vrf_newlink, | |
694 | .dellink = vrf_dellink, | |
695 | .setup = vrf_setup, | |
696 | .maxtype = IFLA_VRF_MAX, | |
697 | }; | |
698 | ||
699 | static int vrf_device_event(struct notifier_block *unused, | |
700 | unsigned long event, void *ptr) | |
701 | { | |
702 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
703 | ||
704 | /* only care about unregister events to drop slave references */ | |
705 | if (event == NETDEV_UNREGISTER) { | |
193125db DA |
706 | struct net_device *vrf_dev; |
707 | ||
fee6d4c7 | 708 | if (!netif_is_l3_slave(dev)) |
193125db DA |
709 | goto out; |
710 | ||
58aa9087 NA |
711 | vrf_dev = netdev_master_upper_dev_get(dev); |
712 | vrf_del_slave(vrf_dev, dev); | |
193125db DA |
713 | } |
714 | out: | |
715 | return NOTIFY_DONE; | |
716 | } | |
717 | ||
718 | static struct notifier_block vrf_notifier_block __read_mostly = { | |
719 | .notifier_call = vrf_device_event, | |
720 | }; | |
721 | ||
722 | static int __init vrf_init_module(void) | |
723 | { | |
724 | int rc; | |
725 | ||
726 | vrf_dst_ops.kmem_cachep = | |
727 | kmem_cache_create("vrf_ip_dst_cache", | |
728 | sizeof(struct rtable), 0, | |
e367da02 | 729 | SLAB_HWCACHE_ALIGN, |
193125db DA |
730 | NULL); |
731 | ||
732 | if (!vrf_dst_ops.kmem_cachep) | |
733 | return -ENOMEM; | |
734 | ||
735 | register_netdevice_notifier(&vrf_notifier_block); | |
736 | ||
737 | rc = rtnl_link_register(&vrf_link_ops); | |
738 | if (rc < 0) | |
739 | goto error; | |
740 | ||
741 | return 0; | |
742 | ||
743 | error: | |
744 | unregister_netdevice_notifier(&vrf_notifier_block); | |
745 | kmem_cache_destroy(vrf_dst_ops.kmem_cachep); | |
746 | return rc; | |
747 | } | |
748 | ||
749 | static void __exit vrf_cleanup_module(void) | |
750 | { | |
751 | rtnl_link_unregister(&vrf_link_ops); | |
752 | unregister_netdevice_notifier(&vrf_notifier_block); | |
753 | kmem_cache_destroy(vrf_dst_ops.kmem_cachep); | |
754 | } | |
755 | ||
756 | module_init(vrf_init_module); | |
757 | module_exit(vrf_cleanup_module); | |
758 | MODULE_AUTHOR("Shrijeet Mukherjee, David Ahern"); | |
759 | MODULE_DESCRIPTION("Device driver to instantiate VRF domains"); | |
760 | MODULE_LICENSE("GPL"); | |
761 | MODULE_ALIAS_RTNL_LINK(DRV_NAME); | |
762 | MODULE_VERSION(DRV_VERSION); |