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> | |
30 | #include <net/ip.h> | |
31 | #include <net/ip_fib.h> | |
32 | #include <net/ip6_route.h> | |
33 | #include <net/rtnetlink.h> | |
34 | #include <net/route.h> | |
35 | #include <net/addrconf.h> | |
36 | #include <net/vrf.h> | |
37 | ||
38 | #define DRV_NAME "vrf" | |
39 | #define DRV_VERSION "1.0" | |
40 | ||
41 | #define vrf_is_slave(dev) ((dev)->flags & IFF_SLAVE) | |
42 | ||
43 | #define vrf_master_get_rcu(dev) \ | |
44 | ((struct net_device *)rcu_dereference(dev->rx_handler_data)) | |
45 | ||
46 | struct pcpu_dstats { | |
47 | u64 tx_pkts; | |
48 | u64 tx_bytes; | |
49 | u64 tx_drps; | |
50 | u64 rx_pkts; | |
51 | u64 rx_bytes; | |
52 | struct u64_stats_sync syncp; | |
53 | }; | |
54 | ||
55 | static struct dst_entry *vrf_ip_check(struct dst_entry *dst, u32 cookie) | |
56 | { | |
57 | return dst; | |
58 | } | |
59 | ||
60 | static int vrf_ip_local_out(struct sk_buff *skb) | |
61 | { | |
62 | return ip_local_out(skb); | |
63 | } | |
64 | ||
65 | static unsigned int vrf_v4_mtu(const struct dst_entry *dst) | |
66 | { | |
67 | /* TO-DO: return max ethernet size? */ | |
68 | return dst->dev->mtu; | |
69 | } | |
70 | ||
71 | static void vrf_dst_destroy(struct dst_entry *dst) | |
72 | { | |
73 | /* our dst lives forever - or until the device is closed */ | |
74 | } | |
75 | ||
76 | static unsigned int vrf_default_advmss(const struct dst_entry *dst) | |
77 | { | |
78 | return 65535 - 40; | |
79 | } | |
80 | ||
81 | static struct dst_ops vrf_dst_ops = { | |
82 | .family = AF_INET, | |
83 | .local_out = vrf_ip_local_out, | |
84 | .check = vrf_ip_check, | |
85 | .mtu = vrf_v4_mtu, | |
86 | .destroy = vrf_dst_destroy, | |
87 | .default_advmss = vrf_default_advmss, | |
88 | }; | |
89 | ||
90 | static bool is_ip_rx_frame(struct sk_buff *skb) | |
91 | { | |
92 | switch (skb->protocol) { | |
93 | case htons(ETH_P_IP): | |
94 | case htons(ETH_P_IPV6): | |
95 | return true; | |
96 | } | |
97 | return false; | |
98 | } | |
99 | ||
100 | /* note: already called with rcu_read_lock */ | |
101 | static rx_handler_result_t vrf_handle_frame(struct sk_buff **pskb) | |
102 | { | |
103 | struct sk_buff *skb = *pskb; | |
104 | ||
105 | if (is_ip_rx_frame(skb)) { | |
106 | struct net_device *dev = vrf_master_get_rcu(skb->dev); | |
107 | struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats); | |
108 | ||
109 | u64_stats_update_begin(&dstats->syncp); | |
110 | dstats->rx_pkts++; | |
111 | dstats->rx_bytes += skb->len; | |
112 | u64_stats_update_end(&dstats->syncp); | |
113 | ||
114 | skb->dev = dev; | |
115 | ||
116 | return RX_HANDLER_ANOTHER; | |
117 | } | |
118 | return RX_HANDLER_PASS; | |
119 | } | |
120 | ||
121 | static struct rtnl_link_stats64 *vrf_get_stats64(struct net_device *dev, | |
122 | struct rtnl_link_stats64 *stats) | |
123 | { | |
124 | int i; | |
125 | ||
126 | for_each_possible_cpu(i) { | |
127 | const struct pcpu_dstats *dstats; | |
128 | u64 tbytes, tpkts, tdrops, rbytes, rpkts; | |
129 | unsigned int start; | |
130 | ||
131 | dstats = per_cpu_ptr(dev->dstats, i); | |
132 | do { | |
133 | start = u64_stats_fetch_begin_irq(&dstats->syncp); | |
134 | tbytes = dstats->tx_bytes; | |
135 | tpkts = dstats->tx_pkts; | |
136 | tdrops = dstats->tx_drps; | |
137 | rbytes = dstats->rx_bytes; | |
138 | rpkts = dstats->rx_pkts; | |
139 | } while (u64_stats_fetch_retry_irq(&dstats->syncp, start)); | |
140 | stats->tx_bytes += tbytes; | |
141 | stats->tx_packets += tpkts; | |
142 | stats->tx_dropped += tdrops; | |
143 | stats->rx_bytes += rbytes; | |
144 | stats->rx_packets += rpkts; | |
145 | } | |
146 | return stats; | |
147 | } | |
148 | ||
149 | static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb, | |
150 | struct net_device *dev) | |
151 | { | |
152 | return 0; | |
153 | } | |
154 | ||
155 | static int vrf_send_v4_prep(struct sk_buff *skb, struct flowi4 *fl4, | |
156 | struct net_device *vrf_dev) | |
157 | { | |
158 | struct rtable *rt; | |
159 | int err = 1; | |
160 | ||
161 | rt = ip_route_output_flow(dev_net(vrf_dev), fl4, NULL); | |
162 | if (IS_ERR(rt)) | |
163 | goto out; | |
164 | ||
165 | /* TO-DO: what about broadcast ? */ | |
166 | if (rt->rt_type != RTN_UNICAST && rt->rt_type != RTN_LOCAL) { | |
167 | ip_rt_put(rt); | |
168 | goto out; | |
169 | } | |
170 | ||
171 | skb_dst_drop(skb); | |
172 | skb_dst_set(skb, &rt->dst); | |
173 | err = 0; | |
174 | out: | |
175 | return err; | |
176 | } | |
177 | ||
178 | static netdev_tx_t vrf_process_v4_outbound(struct sk_buff *skb, | |
179 | struct net_device *vrf_dev) | |
180 | { | |
181 | struct iphdr *ip4h = ip_hdr(skb); | |
182 | int ret = NET_XMIT_DROP; | |
183 | struct flowi4 fl4 = { | |
184 | /* needed to match OIF rule */ | |
185 | .flowi4_oif = vrf_dev->ifindex, | |
186 | .flowi4_iif = LOOPBACK_IFINDEX, | |
187 | .flowi4_tos = RT_TOS(ip4h->tos), | |
188 | .flowi4_flags = FLOWI_FLAG_ANYSRC | FLOWI_FLAG_VRFSRC, | |
189 | .daddr = ip4h->daddr, | |
190 | }; | |
191 | ||
192 | if (vrf_send_v4_prep(skb, &fl4, vrf_dev)) | |
193 | goto err; | |
194 | ||
195 | if (!ip4h->saddr) { | |
196 | ip4h->saddr = inet_select_addr(skb_dst(skb)->dev, 0, | |
197 | RT_SCOPE_LINK); | |
198 | } | |
199 | ||
200 | ret = ip_local_out(skb); | |
201 | if (unlikely(net_xmit_eval(ret))) | |
202 | vrf_dev->stats.tx_errors++; | |
203 | else | |
204 | ret = NET_XMIT_SUCCESS; | |
205 | ||
206 | out: | |
207 | return ret; | |
208 | err: | |
209 | vrf_dev->stats.tx_errors++; | |
210 | kfree_skb(skb); | |
211 | goto out; | |
212 | } | |
213 | ||
214 | static netdev_tx_t is_ip_tx_frame(struct sk_buff *skb, struct net_device *dev) | |
215 | { | |
216 | switch (skb->protocol) { | |
217 | case htons(ETH_P_IP): | |
218 | return vrf_process_v4_outbound(skb, dev); | |
219 | case htons(ETH_P_IPV6): | |
220 | return vrf_process_v6_outbound(skb, dev); | |
221 | default: | |
222 | return NET_XMIT_DROP; | |
223 | } | |
224 | } | |
225 | ||
226 | static netdev_tx_t vrf_xmit(struct sk_buff *skb, struct net_device *dev) | |
227 | { | |
228 | netdev_tx_t ret = is_ip_tx_frame(skb, dev); | |
229 | ||
230 | if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { | |
231 | struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats); | |
232 | ||
233 | u64_stats_update_begin(&dstats->syncp); | |
234 | dstats->tx_pkts++; | |
235 | dstats->tx_bytes += skb->len; | |
236 | u64_stats_update_end(&dstats->syncp); | |
237 | } else { | |
238 | this_cpu_inc(dev->dstats->tx_drps); | |
239 | } | |
240 | ||
241 | return ret; | |
242 | } | |
243 | ||
244 | static netdev_tx_t vrf_finish(struct sock *sk, struct sk_buff *skb) | |
245 | { | |
246 | return dev_queue_xmit(skb); | |
247 | } | |
248 | ||
249 | static int vrf_output(struct sock *sk, struct sk_buff *skb) | |
250 | { | |
251 | struct net_device *dev = skb_dst(skb)->dev; | |
252 | ||
253 | IP_UPD_PO_STATS(dev_net(dev), IPSTATS_MIB_OUT, skb->len); | |
254 | ||
255 | skb->dev = dev; | |
256 | skb->protocol = htons(ETH_P_IP); | |
257 | ||
258 | return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING, sk, skb, | |
259 | NULL, dev, | |
260 | vrf_finish, | |
261 | !(IPCB(skb)->flags & IPSKB_REROUTED)); | |
262 | } | |
263 | ||
264 | static void vrf_rtable_destroy(struct net_vrf *vrf) | |
265 | { | |
266 | struct dst_entry *dst = (struct dst_entry *)vrf->rth; | |
267 | ||
3a4a27d3 | 268 | dst_destroy(dst); |
193125db DA |
269 | vrf->rth = NULL; |
270 | } | |
271 | ||
272 | static struct rtable *vrf_rtable_create(struct net_device *dev) | |
273 | { | |
274 | struct rtable *rth; | |
275 | ||
276 | rth = dst_alloc(&vrf_dst_ops, dev, 2, | |
277 | DST_OBSOLETE_NONE, | |
278 | (DST_HOST | DST_NOPOLICY | DST_NOXFRM)); | |
279 | if (rth) { | |
280 | rth->dst.output = vrf_output; | |
281 | rth->rt_genid = rt_genid_ipv4(dev_net(dev)); | |
282 | rth->rt_flags = 0; | |
283 | rth->rt_type = RTN_UNICAST; | |
284 | rth->rt_is_input = 0; | |
285 | rth->rt_iif = 0; | |
286 | rth->rt_pmtu = 0; | |
287 | rth->rt_gateway = 0; | |
288 | rth->rt_uses_gateway = 0; | |
289 | INIT_LIST_HEAD(&rth->rt_uncached); | |
290 | rth->rt_uncached_list = NULL; | |
291 | rth->rt_lwtstate = NULL; | |
292 | } | |
293 | ||
294 | return rth; | |
295 | } | |
296 | ||
297 | /**************************** device handling ********************/ | |
298 | ||
299 | /* cycle interface to flush neighbor cache and move routes across tables */ | |
300 | static void cycle_netdev(struct net_device *dev) | |
301 | { | |
302 | unsigned int flags = dev->flags; | |
303 | int ret; | |
304 | ||
305 | if (!netif_running(dev)) | |
306 | return; | |
307 | ||
308 | ret = dev_change_flags(dev, flags & ~IFF_UP); | |
309 | if (ret >= 0) | |
310 | ret = dev_change_flags(dev, flags); | |
311 | ||
312 | if (ret < 0) { | |
313 | netdev_err(dev, | |
314 | "Failed to cycle device %s; route tables might be wrong!\n", | |
315 | dev->name); | |
316 | } | |
317 | } | |
318 | ||
319 | static struct slave *__vrf_find_slave_dev(struct slave_queue *queue, | |
320 | struct net_device *dev) | |
321 | { | |
322 | struct list_head *head = &queue->all_slaves; | |
323 | struct slave *slave; | |
324 | ||
325 | list_for_each_entry(slave, head, list) { | |
326 | if (slave->dev == dev) | |
327 | return slave; | |
328 | } | |
329 | ||
330 | return NULL; | |
331 | } | |
332 | ||
333 | /* inverse of __vrf_insert_slave */ | |
334 | static void __vrf_remove_slave(struct slave_queue *queue, struct slave *slave) | |
335 | { | |
193125db | 336 | list_del(&slave->list); |
193125db DA |
337 | } |
338 | ||
339 | static void __vrf_insert_slave(struct slave_queue *queue, struct slave *slave) | |
340 | { | |
193125db | 341 | list_add(&slave->list, &queue->all_slaves); |
193125db DA |
342 | } |
343 | ||
344 | static int do_vrf_add_slave(struct net_device *dev, struct net_device *port_dev) | |
345 | { | |
346 | struct net_vrf_dev *vrf_ptr = kmalloc(sizeof(*vrf_ptr), GFP_KERNEL); | |
347 | struct slave *slave = kzalloc(sizeof(*slave), GFP_KERNEL); | |
348 | struct slave *duplicate_slave; | |
349 | struct net_vrf *vrf = netdev_priv(dev); | |
350 | struct slave_queue *queue = &vrf->queue; | |
351 | int ret = -ENOMEM; | |
352 | ||
353 | if (!slave || !vrf_ptr) | |
354 | goto out_fail; | |
355 | ||
356 | slave->dev = port_dev; | |
357 | ||
358 | vrf_ptr->ifindex = dev->ifindex; | |
359 | vrf_ptr->tb_id = vrf->tb_id; | |
360 | ||
361 | duplicate_slave = __vrf_find_slave_dev(queue, port_dev); | |
362 | if (duplicate_slave) { | |
363 | ret = -EBUSY; | |
364 | goto out_fail; | |
365 | } | |
366 | ||
367 | __vrf_insert_slave(queue, slave); | |
368 | ||
369 | /* register the packet handler for slave ports */ | |
370 | ret = netdev_rx_handler_register(port_dev, vrf_handle_frame, dev); | |
371 | if (ret) { | |
372 | netdev_err(port_dev, | |
373 | "Device %s failed to register rx_handler\n", | |
374 | port_dev->name); | |
375 | goto out_remove; | |
376 | } | |
377 | ||
378 | ret = netdev_master_upper_dev_link(port_dev, dev); | |
379 | if (ret < 0) | |
380 | goto out_unregister; | |
381 | ||
382 | port_dev->flags |= IFF_SLAVE; | |
383 | ||
384 | rcu_assign_pointer(port_dev->vrf_ptr, vrf_ptr); | |
385 | cycle_netdev(port_dev); | |
386 | ||
387 | return 0; | |
388 | ||
389 | out_unregister: | |
390 | netdev_rx_handler_unregister(port_dev); | |
391 | out_remove: | |
392 | __vrf_remove_slave(queue, slave); | |
393 | out_fail: | |
394 | kfree(vrf_ptr); | |
395 | kfree(slave); | |
396 | return ret; | |
397 | } | |
398 | ||
399 | static int vrf_add_slave(struct net_device *dev, struct net_device *port_dev) | |
400 | { | |
401 | if (!netif_is_vrf(dev) || netif_is_vrf(port_dev) || | |
402 | vrf_is_slave(port_dev)) | |
403 | return -EINVAL; | |
404 | ||
405 | return do_vrf_add_slave(dev, port_dev); | |
406 | } | |
407 | ||
408 | /* inverse of do_vrf_add_slave */ | |
409 | static int do_vrf_del_slave(struct net_device *dev, struct net_device *port_dev) | |
410 | { | |
411 | struct net_vrf_dev *vrf_ptr = rtnl_dereference(port_dev->vrf_ptr); | |
412 | struct net_vrf *vrf = netdev_priv(dev); | |
413 | struct slave_queue *queue = &vrf->queue; | |
414 | struct slave *slave; | |
415 | ||
416 | RCU_INIT_POINTER(port_dev->vrf_ptr, NULL); | |
417 | ||
418 | netdev_upper_dev_unlink(port_dev, dev); | |
419 | port_dev->flags &= ~IFF_SLAVE; | |
420 | ||
421 | netdev_rx_handler_unregister(port_dev); | |
422 | ||
423 | /* after netdev_rx_handler_unregister for synchronize_rcu */ | |
424 | kfree(vrf_ptr); | |
425 | ||
426 | cycle_netdev(port_dev); | |
427 | ||
428 | slave = __vrf_find_slave_dev(queue, port_dev); | |
429 | if (slave) | |
430 | __vrf_remove_slave(queue, slave); | |
431 | ||
432 | kfree(slave); | |
433 | ||
434 | return 0; | |
435 | } | |
436 | ||
437 | static int vrf_del_slave(struct net_device *dev, struct net_device *port_dev) | |
438 | { | |
439 | if (!netif_is_vrf(dev)) | |
440 | return -EINVAL; | |
441 | ||
442 | return do_vrf_del_slave(dev, port_dev); | |
443 | } | |
444 | ||
445 | static void vrf_dev_uninit(struct net_device *dev) | |
446 | { | |
447 | struct net_vrf *vrf = netdev_priv(dev); | |
448 | struct slave_queue *queue = &vrf->queue; | |
449 | struct list_head *head = &queue->all_slaves; | |
450 | struct slave *slave, *next; | |
451 | ||
452 | vrf_rtable_destroy(vrf); | |
453 | ||
454 | list_for_each_entry_safe(slave, next, head, list) | |
455 | vrf_del_slave(dev, slave->dev); | |
456 | ||
3a4a27d3 | 457 | free_percpu(dev->dstats); |
193125db DA |
458 | dev->dstats = NULL; |
459 | } | |
460 | ||
461 | static int vrf_dev_init(struct net_device *dev) | |
462 | { | |
463 | struct net_vrf *vrf = netdev_priv(dev); | |
464 | ||
465 | INIT_LIST_HEAD(&vrf->queue.all_slaves); | |
466 | ||
467 | dev->dstats = netdev_alloc_pcpu_stats(struct pcpu_dstats); | |
468 | if (!dev->dstats) | |
469 | goto out_nomem; | |
470 | ||
471 | /* create the default dst which points back to us */ | |
472 | vrf->rth = vrf_rtable_create(dev); | |
473 | if (!vrf->rth) | |
474 | goto out_stats; | |
475 | ||
476 | dev->flags = IFF_MASTER | IFF_NOARP; | |
477 | ||
478 | return 0; | |
479 | ||
480 | out_stats: | |
481 | free_percpu(dev->dstats); | |
482 | dev->dstats = NULL; | |
483 | out_nomem: | |
484 | return -ENOMEM; | |
485 | } | |
486 | ||
487 | static const struct net_device_ops vrf_netdev_ops = { | |
488 | .ndo_init = vrf_dev_init, | |
489 | .ndo_uninit = vrf_dev_uninit, | |
490 | .ndo_start_xmit = vrf_xmit, | |
491 | .ndo_get_stats64 = vrf_get_stats64, | |
492 | .ndo_add_slave = vrf_add_slave, | |
493 | .ndo_del_slave = vrf_del_slave, | |
494 | }; | |
495 | ||
496 | static void vrf_get_drvinfo(struct net_device *dev, | |
497 | struct ethtool_drvinfo *info) | |
498 | { | |
499 | strlcpy(info->driver, DRV_NAME, sizeof(info->driver)); | |
500 | strlcpy(info->version, DRV_VERSION, sizeof(info->version)); | |
501 | } | |
502 | ||
503 | static const struct ethtool_ops vrf_ethtool_ops = { | |
504 | .get_drvinfo = vrf_get_drvinfo, | |
505 | }; | |
506 | ||
507 | static void vrf_setup(struct net_device *dev) | |
508 | { | |
509 | ether_setup(dev); | |
510 | ||
511 | /* Initialize the device structure. */ | |
512 | dev->netdev_ops = &vrf_netdev_ops; | |
513 | dev->ethtool_ops = &vrf_ethtool_ops; | |
514 | dev->destructor = free_netdev; | |
515 | ||
516 | /* Fill in device structure with ethernet-generic values. */ | |
517 | eth_hw_addr_random(dev); | |
518 | ||
519 | /* don't acquire vrf device's netif_tx_lock when transmitting */ | |
520 | dev->features |= NETIF_F_LLTX; | |
521 | ||
522 | /* don't allow vrf devices to change network namespaces. */ | |
523 | dev->features |= NETIF_F_NETNS_LOCAL; | |
524 | } | |
525 | ||
526 | static int vrf_validate(struct nlattr *tb[], struct nlattr *data[]) | |
527 | { | |
528 | if (tb[IFLA_ADDRESS]) { | |
529 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) | |
530 | return -EINVAL; | |
531 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) | |
532 | return -EADDRNOTAVAIL; | |
533 | } | |
534 | return 0; | |
535 | } | |
536 | ||
537 | static void vrf_dellink(struct net_device *dev, struct list_head *head) | |
538 | { | |
539 | struct net_vrf_dev *vrf_ptr = rtnl_dereference(dev->vrf_ptr); | |
540 | ||
541 | RCU_INIT_POINTER(dev->vrf_ptr, NULL); | |
542 | kfree_rcu(vrf_ptr, rcu); | |
543 | unregister_netdevice_queue(dev, head); | |
544 | } | |
545 | ||
546 | static int vrf_newlink(struct net *src_net, struct net_device *dev, | |
547 | struct nlattr *tb[], struct nlattr *data[]) | |
548 | { | |
549 | struct net_vrf *vrf = netdev_priv(dev); | |
550 | struct net_vrf_dev *vrf_ptr; | |
551 | int err; | |
552 | ||
553 | if (!data || !data[IFLA_VRF_TABLE]) | |
554 | return -EINVAL; | |
555 | ||
556 | vrf->tb_id = nla_get_u32(data[IFLA_VRF_TABLE]); | |
557 | ||
558 | dev->priv_flags |= IFF_VRF_MASTER; | |
559 | ||
560 | err = -ENOMEM; | |
561 | vrf_ptr = kmalloc(sizeof(*dev->vrf_ptr), GFP_KERNEL); | |
562 | if (!vrf_ptr) | |
563 | goto out_fail; | |
564 | ||
565 | vrf_ptr->ifindex = dev->ifindex; | |
566 | vrf_ptr->tb_id = vrf->tb_id; | |
567 | ||
568 | err = register_netdevice(dev); | |
569 | if (err < 0) | |
570 | goto out_fail; | |
571 | ||
572 | rcu_assign_pointer(dev->vrf_ptr, vrf_ptr); | |
573 | ||
574 | return 0; | |
575 | ||
576 | out_fail: | |
577 | kfree(vrf_ptr); | |
578 | free_netdev(dev); | |
579 | return err; | |
580 | } | |
581 | ||
582 | static size_t vrf_nl_getsize(const struct net_device *dev) | |
583 | { | |
584 | return nla_total_size(sizeof(u32)); /* IFLA_VRF_TABLE */ | |
585 | } | |
586 | ||
587 | static int vrf_fillinfo(struct sk_buff *skb, | |
588 | const struct net_device *dev) | |
589 | { | |
590 | struct net_vrf *vrf = netdev_priv(dev); | |
591 | ||
592 | return nla_put_u32(skb, IFLA_VRF_TABLE, vrf->tb_id); | |
593 | } | |
594 | ||
595 | static const struct nla_policy vrf_nl_policy[IFLA_VRF_MAX + 1] = { | |
596 | [IFLA_VRF_TABLE] = { .type = NLA_U32 }, | |
597 | }; | |
598 | ||
599 | static struct rtnl_link_ops vrf_link_ops __read_mostly = { | |
600 | .kind = DRV_NAME, | |
601 | .priv_size = sizeof(struct net_vrf), | |
602 | ||
603 | .get_size = vrf_nl_getsize, | |
604 | .policy = vrf_nl_policy, | |
605 | .validate = vrf_validate, | |
606 | .fill_info = vrf_fillinfo, | |
607 | ||
608 | .newlink = vrf_newlink, | |
609 | .dellink = vrf_dellink, | |
610 | .setup = vrf_setup, | |
611 | .maxtype = IFLA_VRF_MAX, | |
612 | }; | |
613 | ||
614 | static int vrf_device_event(struct notifier_block *unused, | |
615 | unsigned long event, void *ptr) | |
616 | { | |
617 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
618 | ||
619 | /* only care about unregister events to drop slave references */ | |
620 | if (event == NETDEV_UNREGISTER) { | |
621 | struct net_vrf_dev *vrf_ptr = rtnl_dereference(dev->vrf_ptr); | |
622 | struct net_device *vrf_dev; | |
623 | ||
624 | if (!vrf_ptr || netif_is_vrf(dev)) | |
625 | goto out; | |
626 | ||
627 | vrf_dev = __dev_get_by_index(dev_net(dev), vrf_ptr->ifindex); | |
628 | if (vrf_dev) | |
629 | vrf_del_slave(vrf_dev, dev); | |
630 | } | |
631 | out: | |
632 | return NOTIFY_DONE; | |
633 | } | |
634 | ||
635 | static struct notifier_block vrf_notifier_block __read_mostly = { | |
636 | .notifier_call = vrf_device_event, | |
637 | }; | |
638 | ||
639 | static int __init vrf_init_module(void) | |
640 | { | |
641 | int rc; | |
642 | ||
643 | vrf_dst_ops.kmem_cachep = | |
644 | kmem_cache_create("vrf_ip_dst_cache", | |
645 | sizeof(struct rtable), 0, | |
646 | SLAB_HWCACHE_ALIGN | SLAB_PANIC, | |
647 | NULL); | |
648 | ||
649 | if (!vrf_dst_ops.kmem_cachep) | |
650 | return -ENOMEM; | |
651 | ||
652 | register_netdevice_notifier(&vrf_notifier_block); | |
653 | ||
654 | rc = rtnl_link_register(&vrf_link_ops); | |
655 | if (rc < 0) | |
656 | goto error; | |
657 | ||
658 | return 0; | |
659 | ||
660 | error: | |
661 | unregister_netdevice_notifier(&vrf_notifier_block); | |
662 | kmem_cache_destroy(vrf_dst_ops.kmem_cachep); | |
663 | return rc; | |
664 | } | |
665 | ||
666 | static void __exit vrf_cleanup_module(void) | |
667 | { | |
668 | rtnl_link_unregister(&vrf_link_ops); | |
669 | unregister_netdevice_notifier(&vrf_notifier_block); | |
670 | kmem_cache_destroy(vrf_dst_ops.kmem_cachep); | |
671 | } | |
672 | ||
673 | module_init(vrf_init_module); | |
674 | module_exit(vrf_cleanup_module); | |
675 | MODULE_AUTHOR("Shrijeet Mukherjee, David Ahern"); | |
676 | MODULE_DESCRIPTION("Device driver to instantiate VRF domains"); | |
677 | MODULE_LICENSE("GPL"); | |
678 | MODULE_ALIAS_RTNL_LINK(DRV_NAME); | |
679 | MODULE_VERSION(DRV_VERSION); |