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> | |
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 DA |
38 | |
39 | #define DRV_NAME "vrf" | |
40 | #define DRV_VERSION "1.0" | |
41 | ||
193125db DA |
42 | #define vrf_master_get_rcu(dev) \ |
43 | ((struct net_device *)rcu_dereference(dev->rx_handler_data)) | |
44 | ||
ec539514 DA |
45 | struct slave { |
46 | struct list_head list; | |
47 | struct net_device *dev; | |
48 | }; | |
49 | ||
50 | struct slave_queue { | |
51 | struct list_head all_slaves; | |
52 | }; | |
53 | ||
54 | struct net_vrf { | |
55 | struct slave_queue queue; | |
56 | struct rtable *rth; | |
57 | u32 tb_id; | |
58 | }; | |
59 | ||
193125db DA |
60 | struct pcpu_dstats { |
61 | u64 tx_pkts; | |
62 | u64 tx_bytes; | |
63 | u64 tx_drps; | |
64 | u64 rx_pkts; | |
65 | u64 rx_bytes; | |
66 | struct u64_stats_sync syncp; | |
67 | }; | |
68 | ||
69 | static struct dst_entry *vrf_ip_check(struct dst_entry *dst, u32 cookie) | |
70 | { | |
71 | return dst; | |
72 | } | |
73 | ||
74 | static int vrf_ip_local_out(struct sk_buff *skb) | |
75 | { | |
76 | return ip_local_out(skb); | |
77 | } | |
78 | ||
79 | static unsigned int vrf_v4_mtu(const struct dst_entry *dst) | |
80 | { | |
81 | /* TO-DO: return max ethernet size? */ | |
82 | return dst->dev->mtu; | |
83 | } | |
84 | ||
85 | static void vrf_dst_destroy(struct dst_entry *dst) | |
86 | { | |
87 | /* our dst lives forever - or until the device is closed */ | |
88 | } | |
89 | ||
90 | static unsigned int vrf_default_advmss(const struct dst_entry *dst) | |
91 | { | |
92 | return 65535 - 40; | |
93 | } | |
94 | ||
95 | static struct dst_ops vrf_dst_ops = { | |
96 | .family = AF_INET, | |
97 | .local_out = vrf_ip_local_out, | |
98 | .check = vrf_ip_check, | |
99 | .mtu = vrf_v4_mtu, | |
100 | .destroy = vrf_dst_destroy, | |
101 | .default_advmss = vrf_default_advmss, | |
102 | }; | |
103 | ||
104 | static bool is_ip_rx_frame(struct sk_buff *skb) | |
105 | { | |
106 | switch (skb->protocol) { | |
107 | case htons(ETH_P_IP): | |
108 | case htons(ETH_P_IPV6): | |
109 | return true; | |
110 | } | |
111 | return false; | |
112 | } | |
113 | ||
57b8efa1 NA |
114 | static void vrf_tx_error(struct net_device *vrf_dev, struct sk_buff *skb) |
115 | { | |
116 | vrf_dev->stats.tx_errors++; | |
117 | kfree_skb(skb); | |
118 | } | |
119 | ||
193125db DA |
120 | /* note: already called with rcu_read_lock */ |
121 | static rx_handler_result_t vrf_handle_frame(struct sk_buff **pskb) | |
122 | { | |
123 | struct sk_buff *skb = *pskb; | |
124 | ||
125 | if (is_ip_rx_frame(skb)) { | |
126 | struct net_device *dev = vrf_master_get_rcu(skb->dev); | |
127 | struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats); | |
128 | ||
129 | u64_stats_update_begin(&dstats->syncp); | |
130 | dstats->rx_pkts++; | |
131 | dstats->rx_bytes += skb->len; | |
132 | u64_stats_update_end(&dstats->syncp); | |
133 | ||
134 | skb->dev = dev; | |
135 | ||
136 | return RX_HANDLER_ANOTHER; | |
137 | } | |
138 | return RX_HANDLER_PASS; | |
139 | } | |
140 | ||
141 | static struct rtnl_link_stats64 *vrf_get_stats64(struct net_device *dev, | |
142 | struct rtnl_link_stats64 *stats) | |
143 | { | |
144 | int i; | |
145 | ||
146 | for_each_possible_cpu(i) { | |
147 | const struct pcpu_dstats *dstats; | |
148 | u64 tbytes, tpkts, tdrops, rbytes, rpkts; | |
149 | unsigned int start; | |
150 | ||
151 | dstats = per_cpu_ptr(dev->dstats, i); | |
152 | do { | |
153 | start = u64_stats_fetch_begin_irq(&dstats->syncp); | |
154 | tbytes = dstats->tx_bytes; | |
155 | tpkts = dstats->tx_pkts; | |
156 | tdrops = dstats->tx_drps; | |
157 | rbytes = dstats->rx_bytes; | |
158 | rpkts = dstats->rx_pkts; | |
159 | } while (u64_stats_fetch_retry_irq(&dstats->syncp, start)); | |
160 | stats->tx_bytes += tbytes; | |
161 | stats->tx_packets += tpkts; | |
162 | stats->tx_dropped += tdrops; | |
163 | stats->rx_bytes += rbytes; | |
164 | stats->rx_packets += rpkts; | |
165 | } | |
166 | return stats; | |
167 | } | |
168 | ||
169 | static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb, | |
170 | struct net_device *dev) | |
171 | { | |
57b8efa1 NA |
172 | vrf_tx_error(dev, skb); |
173 | return NET_XMIT_DROP; | |
193125db DA |
174 | } |
175 | ||
176 | static int vrf_send_v4_prep(struct sk_buff *skb, struct flowi4 *fl4, | |
177 | struct net_device *vrf_dev) | |
178 | { | |
179 | struct rtable *rt; | |
180 | int err = 1; | |
181 | ||
182 | rt = ip_route_output_flow(dev_net(vrf_dev), fl4, NULL); | |
183 | if (IS_ERR(rt)) | |
184 | goto out; | |
185 | ||
186 | /* TO-DO: what about broadcast ? */ | |
187 | if (rt->rt_type != RTN_UNICAST && rt->rt_type != RTN_LOCAL) { | |
188 | ip_rt_put(rt); | |
189 | goto out; | |
190 | } | |
191 | ||
192 | skb_dst_drop(skb); | |
193 | skb_dst_set(skb, &rt->dst); | |
194 | err = 0; | |
195 | out: | |
196 | return err; | |
197 | } | |
198 | ||
199 | static netdev_tx_t vrf_process_v4_outbound(struct sk_buff *skb, | |
200 | struct net_device *vrf_dev) | |
201 | { | |
202 | struct iphdr *ip4h = ip_hdr(skb); | |
203 | int ret = NET_XMIT_DROP; | |
204 | struct flowi4 fl4 = { | |
205 | /* needed to match OIF rule */ | |
206 | .flowi4_oif = vrf_dev->ifindex, | |
207 | .flowi4_iif = LOOPBACK_IFINDEX, | |
208 | .flowi4_tos = RT_TOS(ip4h->tos), | |
6e2895a8 | 209 | .flowi4_flags = FLOWI_FLAG_ANYSRC | FLOWI_FLAG_L3MDEV_SRC | |
58189ca7 | 210 | FLOWI_FLAG_SKIP_NH_OIF, |
193125db DA |
211 | .daddr = ip4h->daddr, |
212 | }; | |
213 | ||
214 | if (vrf_send_v4_prep(skb, &fl4, vrf_dev)) | |
215 | goto err; | |
216 | ||
217 | if (!ip4h->saddr) { | |
218 | ip4h->saddr = inet_select_addr(skb_dst(skb)->dev, 0, | |
219 | RT_SCOPE_LINK); | |
220 | } | |
221 | ||
222 | ret = ip_local_out(skb); | |
223 | if (unlikely(net_xmit_eval(ret))) | |
224 | vrf_dev->stats.tx_errors++; | |
225 | else | |
226 | ret = NET_XMIT_SUCCESS; | |
227 | ||
228 | out: | |
229 | return ret; | |
230 | err: | |
57b8efa1 | 231 | vrf_tx_error(vrf_dev, skb); |
193125db DA |
232 | goto out; |
233 | } | |
234 | ||
235 | static netdev_tx_t is_ip_tx_frame(struct sk_buff *skb, struct net_device *dev) | |
236 | { | |
8f58336d DA |
237 | /* strip the ethernet header added for pass through VRF device */ |
238 | __skb_pull(skb, skb_network_offset(skb)); | |
239 | ||
193125db DA |
240 | switch (skb->protocol) { |
241 | case htons(ETH_P_IP): | |
242 | return vrf_process_v4_outbound(skb, dev); | |
243 | case htons(ETH_P_IPV6): | |
244 | return vrf_process_v6_outbound(skb, dev); | |
245 | default: | |
57b8efa1 | 246 | vrf_tx_error(dev, skb); |
193125db DA |
247 | return NET_XMIT_DROP; |
248 | } | |
249 | } | |
250 | ||
251 | static netdev_tx_t vrf_xmit(struct sk_buff *skb, struct net_device *dev) | |
252 | { | |
253 | netdev_tx_t ret = is_ip_tx_frame(skb, dev); | |
254 | ||
255 | if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { | |
256 | struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats); | |
257 | ||
258 | u64_stats_update_begin(&dstats->syncp); | |
259 | dstats->tx_pkts++; | |
260 | dstats->tx_bytes += skb->len; | |
261 | u64_stats_update_end(&dstats->syncp); | |
262 | } else { | |
263 | this_cpu_inc(dev->dstats->tx_drps); | |
264 | } | |
265 | ||
266 | return ret; | |
267 | } | |
268 | ||
8f58336d | 269 | /* modelled after ip_finish_output2 */ |
0c4b51f0 | 270 | static int vrf_finish_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
193125db | 271 | { |
8f58336d DA |
272 | struct dst_entry *dst = skb_dst(skb); |
273 | struct rtable *rt = (struct rtable *)dst; | |
274 | struct net_device *dev = dst->dev; | |
275 | unsigned int hh_len = LL_RESERVED_SPACE(dev); | |
276 | struct neighbour *neigh; | |
277 | u32 nexthop; | |
278 | int ret = -EINVAL; | |
279 | ||
280 | /* Be paranoid, rather than too clever. */ | |
281 | if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) { | |
282 | struct sk_buff *skb2; | |
283 | ||
284 | skb2 = skb_realloc_headroom(skb, LL_RESERVED_SPACE(dev)); | |
285 | if (!skb2) { | |
286 | ret = -ENOMEM; | |
287 | goto err; | |
288 | } | |
289 | if (skb->sk) | |
290 | skb_set_owner_w(skb2, skb->sk); | |
291 | ||
292 | consume_skb(skb); | |
293 | skb = skb2; | |
294 | } | |
295 | ||
296 | rcu_read_lock_bh(); | |
297 | ||
298 | nexthop = (__force u32)rt_nexthop(rt, ip_hdr(skb)->daddr); | |
299 | neigh = __ipv4_neigh_lookup_noref(dev, nexthop); | |
300 | if (unlikely(!neigh)) | |
301 | neigh = __neigh_create(&arp_tbl, &nexthop, dev, false); | |
302 | if (!IS_ERR(neigh)) | |
303 | ret = dst_neigh_output(dst, neigh, skb); | |
304 | ||
305 | rcu_read_unlock_bh(); | |
306 | err: | |
307 | if (unlikely(ret < 0)) | |
308 | vrf_tx_error(skb->dev, skb); | |
309 | return ret; | |
193125db DA |
310 | } |
311 | ||
312 | static int vrf_output(struct sock *sk, struct sk_buff *skb) | |
313 | { | |
314 | struct net_device *dev = skb_dst(skb)->dev; | |
29a26a56 | 315 | struct net *net = dev_net(dev); |
193125db | 316 | |
29a26a56 | 317 | IP_UPD_PO_STATS(net, IPSTATS_MIB_OUT, skb->len); |
193125db DA |
318 | |
319 | skb->dev = dev; | |
320 | skb->protocol = htons(ETH_P_IP); | |
321 | ||
29a26a56 EB |
322 | return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING, |
323 | net, sk, skb, NULL, dev, | |
8f58336d | 324 | vrf_finish_output, |
193125db DA |
325 | !(IPCB(skb)->flags & IPSKB_REROUTED)); |
326 | } | |
327 | ||
328 | static void vrf_rtable_destroy(struct net_vrf *vrf) | |
329 | { | |
330 | struct dst_entry *dst = (struct dst_entry *)vrf->rth; | |
331 | ||
3a4a27d3 | 332 | dst_destroy(dst); |
193125db DA |
333 | vrf->rth = NULL; |
334 | } | |
335 | ||
336 | static struct rtable *vrf_rtable_create(struct net_device *dev) | |
337 | { | |
b7503e0c | 338 | struct net_vrf *vrf = netdev_priv(dev); |
193125db DA |
339 | struct rtable *rth; |
340 | ||
341 | rth = dst_alloc(&vrf_dst_ops, dev, 2, | |
342 | DST_OBSOLETE_NONE, | |
343 | (DST_HOST | DST_NOPOLICY | DST_NOXFRM)); | |
344 | if (rth) { | |
345 | rth->dst.output = vrf_output; | |
346 | rth->rt_genid = rt_genid_ipv4(dev_net(dev)); | |
347 | rth->rt_flags = 0; | |
348 | rth->rt_type = RTN_UNICAST; | |
349 | rth->rt_is_input = 0; | |
350 | rth->rt_iif = 0; | |
351 | rth->rt_pmtu = 0; | |
352 | rth->rt_gateway = 0; | |
353 | rth->rt_uses_gateway = 0; | |
b7503e0c | 354 | rth->rt_table_id = vrf->tb_id; |
193125db DA |
355 | INIT_LIST_HEAD(&rth->rt_uncached); |
356 | rth->rt_uncached_list = NULL; | |
193125db DA |
357 | } |
358 | ||
359 | return rth; | |
360 | } | |
361 | ||
362 | /**************************** device handling ********************/ | |
363 | ||
364 | /* cycle interface to flush neighbor cache and move routes across tables */ | |
365 | static void cycle_netdev(struct net_device *dev) | |
366 | { | |
367 | unsigned int flags = dev->flags; | |
368 | int ret; | |
369 | ||
370 | if (!netif_running(dev)) | |
371 | return; | |
372 | ||
373 | ret = dev_change_flags(dev, flags & ~IFF_UP); | |
374 | if (ret >= 0) | |
375 | ret = dev_change_flags(dev, flags); | |
376 | ||
377 | if (ret < 0) { | |
378 | netdev_err(dev, | |
379 | "Failed to cycle device %s; route tables might be wrong!\n", | |
380 | dev->name); | |
381 | } | |
382 | } | |
383 | ||
384 | static struct slave *__vrf_find_slave_dev(struct slave_queue *queue, | |
385 | struct net_device *dev) | |
386 | { | |
387 | struct list_head *head = &queue->all_slaves; | |
388 | struct slave *slave; | |
389 | ||
390 | list_for_each_entry(slave, head, list) { | |
391 | if (slave->dev == dev) | |
392 | return slave; | |
393 | } | |
394 | ||
395 | return NULL; | |
396 | } | |
397 | ||
398 | /* inverse of __vrf_insert_slave */ | |
399 | static void __vrf_remove_slave(struct slave_queue *queue, struct slave *slave) | |
400 | { | |
193125db | 401 | list_del(&slave->list); |
193125db DA |
402 | } |
403 | ||
404 | static void __vrf_insert_slave(struct slave_queue *queue, struct slave *slave) | |
405 | { | |
193125db | 406 | list_add(&slave->list, &queue->all_slaves); |
193125db DA |
407 | } |
408 | ||
409 | static int do_vrf_add_slave(struct net_device *dev, struct net_device *port_dev) | |
410 | { | |
193125db | 411 | struct slave *slave = kzalloc(sizeof(*slave), GFP_KERNEL); |
193125db DA |
412 | struct net_vrf *vrf = netdev_priv(dev); |
413 | struct slave_queue *queue = &vrf->queue; | |
414 | int ret = -ENOMEM; | |
415 | ||
93a7e7e8 | 416 | if (!slave) |
193125db DA |
417 | goto out_fail; |
418 | ||
419 | slave->dev = port_dev; | |
193125db | 420 | |
193125db DA |
421 | /* register the packet handler for slave ports */ |
422 | ret = netdev_rx_handler_register(port_dev, vrf_handle_frame, dev); | |
423 | if (ret) { | |
424 | netdev_err(port_dev, | |
425 | "Device %s failed to register rx_handler\n", | |
426 | port_dev->name); | |
15df5e71 | 427 | goto out_fail; |
193125db DA |
428 | } |
429 | ||
430 | ret = netdev_master_upper_dev_link(port_dev, dev); | |
431 | if (ret < 0) | |
432 | goto out_unregister; | |
433 | ||
fee6d4c7 | 434 | port_dev->priv_flags |= IFF_L3MDEV_SLAVE; |
15df5e71 | 435 | __vrf_insert_slave(queue, slave); |
193125db DA |
436 | cycle_netdev(port_dev); |
437 | ||
438 | return 0; | |
439 | ||
440 | out_unregister: | |
441 | netdev_rx_handler_unregister(port_dev); | |
193125db | 442 | out_fail: |
193125db DA |
443 | kfree(slave); |
444 | return ret; | |
445 | } | |
446 | ||
447 | static int vrf_add_slave(struct net_device *dev, struct net_device *port_dev) | |
448 | { | |
fee6d4c7 | 449 | if (netif_is_l3_master(port_dev) || netif_is_l3_slave(port_dev)) |
193125db DA |
450 | return -EINVAL; |
451 | ||
452 | return do_vrf_add_slave(dev, port_dev); | |
453 | } | |
454 | ||
455 | /* inverse of do_vrf_add_slave */ | |
456 | static int do_vrf_del_slave(struct net_device *dev, struct net_device *port_dev) | |
457 | { | |
193125db DA |
458 | struct net_vrf *vrf = netdev_priv(dev); |
459 | struct slave_queue *queue = &vrf->queue; | |
460 | struct slave *slave; | |
461 | ||
193125db | 462 | netdev_upper_dev_unlink(port_dev, dev); |
fee6d4c7 | 463 | port_dev->priv_flags &= ~IFF_L3MDEV_SLAVE; |
193125db DA |
464 | |
465 | netdev_rx_handler_unregister(port_dev); | |
466 | ||
193125db DA |
467 | cycle_netdev(port_dev); |
468 | ||
469 | slave = __vrf_find_slave_dev(queue, port_dev); | |
470 | if (slave) | |
471 | __vrf_remove_slave(queue, slave); | |
472 | ||
473 | kfree(slave); | |
474 | ||
475 | return 0; | |
476 | } | |
477 | ||
478 | static int vrf_del_slave(struct net_device *dev, struct net_device *port_dev) | |
479 | { | |
193125db DA |
480 | return do_vrf_del_slave(dev, port_dev); |
481 | } | |
482 | ||
483 | static void vrf_dev_uninit(struct net_device *dev) | |
484 | { | |
485 | struct net_vrf *vrf = netdev_priv(dev); | |
486 | struct slave_queue *queue = &vrf->queue; | |
487 | struct list_head *head = &queue->all_slaves; | |
488 | struct slave *slave, *next; | |
489 | ||
490 | vrf_rtable_destroy(vrf); | |
491 | ||
492 | list_for_each_entry_safe(slave, next, head, list) | |
493 | vrf_del_slave(dev, slave->dev); | |
494 | ||
3a4a27d3 | 495 | free_percpu(dev->dstats); |
193125db DA |
496 | dev->dstats = NULL; |
497 | } | |
498 | ||
499 | static int vrf_dev_init(struct net_device *dev) | |
500 | { | |
501 | struct net_vrf *vrf = netdev_priv(dev); | |
502 | ||
503 | INIT_LIST_HEAD(&vrf->queue.all_slaves); | |
504 | ||
505 | dev->dstats = netdev_alloc_pcpu_stats(struct pcpu_dstats); | |
506 | if (!dev->dstats) | |
507 | goto out_nomem; | |
508 | ||
509 | /* create the default dst which points back to us */ | |
510 | vrf->rth = vrf_rtable_create(dev); | |
511 | if (!vrf->rth) | |
512 | goto out_stats; | |
513 | ||
514 | dev->flags = IFF_MASTER | IFF_NOARP; | |
515 | ||
516 | return 0; | |
517 | ||
518 | out_stats: | |
519 | free_percpu(dev->dstats); | |
520 | dev->dstats = NULL; | |
521 | out_nomem: | |
522 | return -ENOMEM; | |
523 | } | |
524 | ||
525 | static const struct net_device_ops vrf_netdev_ops = { | |
526 | .ndo_init = vrf_dev_init, | |
527 | .ndo_uninit = vrf_dev_uninit, | |
528 | .ndo_start_xmit = vrf_xmit, | |
529 | .ndo_get_stats64 = vrf_get_stats64, | |
530 | .ndo_add_slave = vrf_add_slave, | |
531 | .ndo_del_slave = vrf_del_slave, | |
532 | }; | |
533 | ||
ee15ee5d DA |
534 | static u32 vrf_fib_table(const struct net_device *dev) |
535 | { | |
536 | struct net_vrf *vrf = netdev_priv(dev); | |
537 | ||
538 | return vrf->tb_id; | |
539 | } | |
540 | ||
541 | static struct rtable *vrf_get_rtable(const struct net_device *dev, | |
542 | const struct flowi4 *fl4) | |
543 | { | |
544 | struct rtable *rth = NULL; | |
545 | ||
6e2895a8 | 546 | if (!(fl4->flowi4_flags & FLOWI_FLAG_L3MDEV_SRC)) { |
ee15ee5d DA |
547 | struct net_vrf *vrf = netdev_priv(dev); |
548 | ||
549 | rth = vrf->rth; | |
550 | atomic_inc(&rth->dst.__refcnt); | |
551 | } | |
552 | ||
553 | return rth; | |
554 | } | |
555 | ||
556 | static const struct l3mdev_ops vrf_l3mdev_ops = { | |
557 | .l3mdev_fib_table = vrf_fib_table, | |
558 | .l3mdev_get_rtable = vrf_get_rtable, | |
559 | }; | |
560 | ||
193125db DA |
561 | static void vrf_get_drvinfo(struct net_device *dev, |
562 | struct ethtool_drvinfo *info) | |
563 | { | |
564 | strlcpy(info->driver, DRV_NAME, sizeof(info->driver)); | |
565 | strlcpy(info->version, DRV_VERSION, sizeof(info->version)); | |
566 | } | |
567 | ||
568 | static const struct ethtool_ops vrf_ethtool_ops = { | |
569 | .get_drvinfo = vrf_get_drvinfo, | |
570 | }; | |
571 | ||
572 | static void vrf_setup(struct net_device *dev) | |
573 | { | |
574 | ether_setup(dev); | |
575 | ||
576 | /* Initialize the device structure. */ | |
577 | dev->netdev_ops = &vrf_netdev_ops; | |
ee15ee5d | 578 | dev->l3mdev_ops = &vrf_l3mdev_ops; |
193125db DA |
579 | dev->ethtool_ops = &vrf_ethtool_ops; |
580 | dev->destructor = free_netdev; | |
581 | ||
582 | /* Fill in device structure with ethernet-generic values. */ | |
583 | eth_hw_addr_random(dev); | |
584 | ||
585 | /* don't acquire vrf device's netif_tx_lock when transmitting */ | |
586 | dev->features |= NETIF_F_LLTX; | |
587 | ||
588 | /* don't allow vrf devices to change network namespaces. */ | |
589 | dev->features |= NETIF_F_NETNS_LOCAL; | |
590 | } | |
591 | ||
592 | static int vrf_validate(struct nlattr *tb[], struct nlattr *data[]) | |
593 | { | |
594 | if (tb[IFLA_ADDRESS]) { | |
595 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) | |
596 | return -EINVAL; | |
597 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) | |
598 | return -EADDRNOTAVAIL; | |
599 | } | |
600 | return 0; | |
601 | } | |
602 | ||
603 | static void vrf_dellink(struct net_device *dev, struct list_head *head) | |
604 | { | |
193125db DA |
605 | unregister_netdevice_queue(dev, head); |
606 | } | |
607 | ||
608 | static int vrf_newlink(struct net *src_net, struct net_device *dev, | |
609 | struct nlattr *tb[], struct nlattr *data[]) | |
610 | { | |
611 | struct net_vrf *vrf = netdev_priv(dev); | |
193125db DA |
612 | int err; |
613 | ||
614 | if (!data || !data[IFLA_VRF_TABLE]) | |
615 | return -EINVAL; | |
616 | ||
617 | vrf->tb_id = nla_get_u32(data[IFLA_VRF_TABLE]); | |
618 | ||
007979ea | 619 | dev->priv_flags |= IFF_L3MDEV_MASTER; |
193125db | 620 | |
193125db DA |
621 | err = register_netdevice(dev); |
622 | if (err < 0) | |
623 | goto out_fail; | |
624 | ||
193125db DA |
625 | return 0; |
626 | ||
627 | out_fail: | |
193125db DA |
628 | free_netdev(dev); |
629 | return err; | |
630 | } | |
631 | ||
632 | static size_t vrf_nl_getsize(const struct net_device *dev) | |
633 | { | |
634 | return nla_total_size(sizeof(u32)); /* IFLA_VRF_TABLE */ | |
635 | } | |
636 | ||
637 | static int vrf_fillinfo(struct sk_buff *skb, | |
638 | const struct net_device *dev) | |
639 | { | |
640 | struct net_vrf *vrf = netdev_priv(dev); | |
641 | ||
642 | return nla_put_u32(skb, IFLA_VRF_TABLE, vrf->tb_id); | |
643 | } | |
644 | ||
645 | static const struct nla_policy vrf_nl_policy[IFLA_VRF_MAX + 1] = { | |
646 | [IFLA_VRF_TABLE] = { .type = NLA_U32 }, | |
647 | }; | |
648 | ||
649 | static struct rtnl_link_ops vrf_link_ops __read_mostly = { | |
650 | .kind = DRV_NAME, | |
651 | .priv_size = sizeof(struct net_vrf), | |
652 | ||
653 | .get_size = vrf_nl_getsize, | |
654 | .policy = vrf_nl_policy, | |
655 | .validate = vrf_validate, | |
656 | .fill_info = vrf_fillinfo, | |
657 | ||
658 | .newlink = vrf_newlink, | |
659 | .dellink = vrf_dellink, | |
660 | .setup = vrf_setup, | |
661 | .maxtype = IFLA_VRF_MAX, | |
662 | }; | |
663 | ||
664 | static int vrf_device_event(struct notifier_block *unused, | |
665 | unsigned long event, void *ptr) | |
666 | { | |
667 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
668 | ||
669 | /* only care about unregister events to drop slave references */ | |
670 | if (event == NETDEV_UNREGISTER) { | |
193125db DA |
671 | struct net_device *vrf_dev; |
672 | ||
fee6d4c7 | 673 | if (!netif_is_l3_slave(dev)) |
193125db DA |
674 | goto out; |
675 | ||
58aa9087 NA |
676 | vrf_dev = netdev_master_upper_dev_get(dev); |
677 | vrf_del_slave(vrf_dev, dev); | |
193125db DA |
678 | } |
679 | out: | |
680 | return NOTIFY_DONE; | |
681 | } | |
682 | ||
683 | static struct notifier_block vrf_notifier_block __read_mostly = { | |
684 | .notifier_call = vrf_device_event, | |
685 | }; | |
686 | ||
687 | static int __init vrf_init_module(void) | |
688 | { | |
689 | int rc; | |
690 | ||
691 | vrf_dst_ops.kmem_cachep = | |
692 | kmem_cache_create("vrf_ip_dst_cache", | |
693 | sizeof(struct rtable), 0, | |
e367da02 | 694 | SLAB_HWCACHE_ALIGN, |
193125db DA |
695 | NULL); |
696 | ||
697 | if (!vrf_dst_ops.kmem_cachep) | |
698 | return -ENOMEM; | |
699 | ||
700 | register_netdevice_notifier(&vrf_notifier_block); | |
701 | ||
702 | rc = rtnl_link_register(&vrf_link_ops); | |
703 | if (rc < 0) | |
704 | goto error; | |
705 | ||
706 | return 0; | |
707 | ||
708 | error: | |
709 | unregister_netdevice_notifier(&vrf_notifier_block); | |
710 | kmem_cache_destroy(vrf_dst_ops.kmem_cachep); | |
711 | return rc; | |
712 | } | |
713 | ||
714 | static void __exit vrf_cleanup_module(void) | |
715 | { | |
716 | rtnl_link_unregister(&vrf_link_ops); | |
717 | unregister_netdevice_notifier(&vrf_notifier_block); | |
718 | kmem_cache_destroy(vrf_dst_ops.kmem_cachep); | |
719 | } | |
720 | ||
721 | module_init(vrf_init_module); | |
722 | module_exit(vrf_cleanup_module); | |
723 | MODULE_AUTHOR("Shrijeet Mukherjee, David Ahern"); | |
724 | MODULE_DESCRIPTION("Device driver to instantiate VRF domains"); | |
725 | MODULE_LICENSE("GPL"); | |
726 | MODULE_ALIAS_RTNL_LINK(DRV_NAME); | |
727 | MODULE_VERSION(DRV_VERSION); |