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Commit | Line | Data |
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193125db DA |
1 | /* |
2 | * vrf.c: device driver to encapsulate a VRF space | |
3 | * | |
4 | * Copyright (c) 2015 Cumulus Networks. All rights reserved. | |
5 | * Copyright (c) 2015 Shrijeet Mukherjee <shm@cumulusnetworks.com> | |
6 | * Copyright (c) 2015 David Ahern <dsa@cumulusnetworks.com> | |
7 | * | |
8 | * Based on dummy, team and ipvlan drivers | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | */ | |
15 | ||
16 | #include <linux/module.h> | |
17 | #include <linux/kernel.h> | |
18 | #include <linux/netdevice.h> | |
19 | #include <linux/etherdevice.h> | |
20 | #include <linux/ip.h> | |
21 | #include <linux/init.h> | |
22 | #include <linux/moduleparam.h> | |
23 | #include <linux/netfilter.h> | |
24 | #include <linux/rtnetlink.h> | |
25 | #include <net/rtnetlink.h> | |
26 | #include <linux/u64_stats_sync.h> | |
27 | #include <linux/hashtable.h> | |
28 | ||
29 | #include <linux/inetdevice.h> | |
8f58336d | 30 | #include <net/arp.h> |
193125db DA |
31 | #include <net/ip.h> |
32 | #include <net/ip_fib.h> | |
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 | ||
cf91a99d | 77 | static int vrf_ip_local_out(struct net *net, struct sock *sk, struct sk_buff *skb) |
193125db | 78 | { |
33224b16 | 79 | return ip_local_out(net, 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 | ||
33224b16 | 225 | ret = ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb); |
193125db DA |
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 | ||
ede2059d | 315 | static int vrf_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
193125db DA |
316 | { |
317 | struct net_device *dev = skb_dst(skb)->dev; | |
318 | ||
29a26a56 | 319 | IP_UPD_PO_STATS(net, IPSTATS_MIB_OUT, skb->len); |
193125db DA |
320 | |
321 | skb->dev = dev; | |
322 | skb->protocol = htons(ETH_P_IP); | |
323 | ||
29a26a56 EB |
324 | return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING, |
325 | net, sk, skb, NULL, dev, | |
8f58336d | 326 | vrf_finish_output, |
193125db DA |
327 | !(IPCB(skb)->flags & IPSKB_REROUTED)); |
328 | } | |
329 | ||
330 | static void vrf_rtable_destroy(struct net_vrf *vrf) | |
331 | { | |
332 | struct dst_entry *dst = (struct dst_entry *)vrf->rth; | |
333 | ||
3a4a27d3 | 334 | dst_destroy(dst); |
193125db DA |
335 | vrf->rth = NULL; |
336 | } | |
337 | ||
338 | static struct rtable *vrf_rtable_create(struct net_device *dev) | |
339 | { | |
b7503e0c | 340 | struct net_vrf *vrf = netdev_priv(dev); |
193125db DA |
341 | struct rtable *rth; |
342 | ||
343 | rth = dst_alloc(&vrf_dst_ops, dev, 2, | |
344 | DST_OBSOLETE_NONE, | |
345 | (DST_HOST | DST_NOPOLICY | DST_NOXFRM)); | |
346 | if (rth) { | |
347 | rth->dst.output = vrf_output; | |
348 | rth->rt_genid = rt_genid_ipv4(dev_net(dev)); | |
349 | rth->rt_flags = 0; | |
350 | rth->rt_type = RTN_UNICAST; | |
351 | rth->rt_is_input = 0; | |
352 | rth->rt_iif = 0; | |
353 | rth->rt_pmtu = 0; | |
354 | rth->rt_gateway = 0; | |
355 | rth->rt_uses_gateway = 0; | |
b7503e0c | 356 | rth->rt_table_id = vrf->tb_id; |
193125db DA |
357 | INIT_LIST_HEAD(&rth->rt_uncached); |
358 | rth->rt_uncached_list = NULL; | |
193125db DA |
359 | } |
360 | ||
361 | return rth; | |
362 | } | |
363 | ||
364 | /**************************** device handling ********************/ | |
365 | ||
366 | /* cycle interface to flush neighbor cache and move routes across tables */ | |
367 | static void cycle_netdev(struct net_device *dev) | |
368 | { | |
369 | unsigned int flags = dev->flags; | |
370 | int ret; | |
371 | ||
372 | if (!netif_running(dev)) | |
373 | return; | |
374 | ||
375 | ret = dev_change_flags(dev, flags & ~IFF_UP); | |
376 | if (ret >= 0) | |
377 | ret = dev_change_flags(dev, flags); | |
378 | ||
379 | if (ret < 0) { | |
380 | netdev_err(dev, | |
381 | "Failed to cycle device %s; route tables might be wrong!\n", | |
382 | dev->name); | |
383 | } | |
384 | } | |
385 | ||
386 | static struct slave *__vrf_find_slave_dev(struct slave_queue *queue, | |
387 | struct net_device *dev) | |
388 | { | |
389 | struct list_head *head = &queue->all_slaves; | |
390 | struct slave *slave; | |
391 | ||
392 | list_for_each_entry(slave, head, list) { | |
393 | if (slave->dev == dev) | |
394 | return slave; | |
395 | } | |
396 | ||
397 | return NULL; | |
398 | } | |
399 | ||
400 | /* inverse of __vrf_insert_slave */ | |
401 | static void __vrf_remove_slave(struct slave_queue *queue, struct slave *slave) | |
402 | { | |
193125db | 403 | list_del(&slave->list); |
193125db DA |
404 | } |
405 | ||
406 | static void __vrf_insert_slave(struct slave_queue *queue, struct slave *slave) | |
407 | { | |
193125db | 408 | list_add(&slave->list, &queue->all_slaves); |
193125db DA |
409 | } |
410 | ||
411 | static int do_vrf_add_slave(struct net_device *dev, struct net_device *port_dev) | |
412 | { | |
193125db | 413 | struct slave *slave = kzalloc(sizeof(*slave), GFP_KERNEL); |
193125db DA |
414 | struct net_vrf *vrf = netdev_priv(dev); |
415 | struct slave_queue *queue = &vrf->queue; | |
416 | int ret = -ENOMEM; | |
417 | ||
93a7e7e8 | 418 | if (!slave) |
193125db DA |
419 | goto out_fail; |
420 | ||
421 | slave->dev = port_dev; | |
193125db | 422 | |
193125db DA |
423 | /* register the packet handler for slave ports */ |
424 | ret = netdev_rx_handler_register(port_dev, vrf_handle_frame, dev); | |
425 | if (ret) { | |
426 | netdev_err(port_dev, | |
427 | "Device %s failed to register rx_handler\n", | |
428 | port_dev->name); | |
15df5e71 | 429 | goto out_fail; |
193125db DA |
430 | } |
431 | ||
432 | ret = netdev_master_upper_dev_link(port_dev, dev); | |
433 | if (ret < 0) | |
434 | goto out_unregister; | |
435 | ||
fee6d4c7 | 436 | port_dev->priv_flags |= IFF_L3MDEV_SLAVE; |
15df5e71 | 437 | __vrf_insert_slave(queue, slave); |
193125db DA |
438 | cycle_netdev(port_dev); |
439 | ||
440 | return 0; | |
441 | ||
442 | out_unregister: | |
443 | netdev_rx_handler_unregister(port_dev); | |
193125db | 444 | out_fail: |
193125db DA |
445 | kfree(slave); |
446 | return ret; | |
447 | } | |
448 | ||
449 | static int vrf_add_slave(struct net_device *dev, struct net_device *port_dev) | |
450 | { | |
fee6d4c7 | 451 | if (netif_is_l3_master(port_dev) || netif_is_l3_slave(port_dev)) |
193125db DA |
452 | return -EINVAL; |
453 | ||
454 | return do_vrf_add_slave(dev, port_dev); | |
455 | } | |
456 | ||
457 | /* inverse of do_vrf_add_slave */ | |
458 | static int do_vrf_del_slave(struct net_device *dev, struct net_device *port_dev) | |
459 | { | |
193125db DA |
460 | struct net_vrf *vrf = netdev_priv(dev); |
461 | struct slave_queue *queue = &vrf->queue; | |
462 | struct slave *slave; | |
463 | ||
193125db | 464 | netdev_upper_dev_unlink(port_dev, dev); |
fee6d4c7 | 465 | port_dev->priv_flags &= ~IFF_L3MDEV_SLAVE; |
193125db DA |
466 | |
467 | netdev_rx_handler_unregister(port_dev); | |
468 | ||
193125db DA |
469 | cycle_netdev(port_dev); |
470 | ||
471 | slave = __vrf_find_slave_dev(queue, port_dev); | |
472 | if (slave) | |
473 | __vrf_remove_slave(queue, slave); | |
474 | ||
475 | kfree(slave); | |
476 | ||
477 | return 0; | |
478 | } | |
479 | ||
480 | static int vrf_del_slave(struct net_device *dev, struct net_device *port_dev) | |
481 | { | |
193125db DA |
482 | return do_vrf_del_slave(dev, port_dev); |
483 | } | |
484 | ||
485 | static void vrf_dev_uninit(struct net_device *dev) | |
486 | { | |
487 | struct net_vrf *vrf = netdev_priv(dev); | |
488 | struct slave_queue *queue = &vrf->queue; | |
489 | struct list_head *head = &queue->all_slaves; | |
490 | struct slave *slave, *next; | |
491 | ||
492 | vrf_rtable_destroy(vrf); | |
493 | ||
494 | list_for_each_entry_safe(slave, next, head, list) | |
495 | vrf_del_slave(dev, slave->dev); | |
496 | ||
3a4a27d3 | 497 | free_percpu(dev->dstats); |
193125db DA |
498 | dev->dstats = NULL; |
499 | } | |
500 | ||
501 | static int vrf_dev_init(struct net_device *dev) | |
502 | { | |
503 | struct net_vrf *vrf = netdev_priv(dev); | |
504 | ||
505 | INIT_LIST_HEAD(&vrf->queue.all_slaves); | |
506 | ||
507 | dev->dstats = netdev_alloc_pcpu_stats(struct pcpu_dstats); | |
508 | if (!dev->dstats) | |
509 | goto out_nomem; | |
510 | ||
511 | /* create the default dst which points back to us */ | |
512 | vrf->rth = vrf_rtable_create(dev); | |
513 | if (!vrf->rth) | |
514 | goto out_stats; | |
515 | ||
516 | dev->flags = IFF_MASTER | IFF_NOARP; | |
517 | ||
518 | return 0; | |
519 | ||
520 | out_stats: | |
521 | free_percpu(dev->dstats); | |
522 | dev->dstats = NULL; | |
523 | out_nomem: | |
524 | return -ENOMEM; | |
525 | } | |
526 | ||
527 | static const struct net_device_ops vrf_netdev_ops = { | |
528 | .ndo_init = vrf_dev_init, | |
529 | .ndo_uninit = vrf_dev_uninit, | |
530 | .ndo_start_xmit = vrf_xmit, | |
531 | .ndo_get_stats64 = vrf_get_stats64, | |
532 | .ndo_add_slave = vrf_add_slave, | |
533 | .ndo_del_slave = vrf_del_slave, | |
534 | }; | |
535 | ||
ee15ee5d DA |
536 | static u32 vrf_fib_table(const struct net_device *dev) |
537 | { | |
538 | struct net_vrf *vrf = netdev_priv(dev); | |
539 | ||
540 | return vrf->tb_id; | |
541 | } | |
542 | ||
543 | static struct rtable *vrf_get_rtable(const struct net_device *dev, | |
544 | const struct flowi4 *fl4) | |
545 | { | |
546 | struct rtable *rth = NULL; | |
547 | ||
6e2895a8 | 548 | if (!(fl4->flowi4_flags & FLOWI_FLAG_L3MDEV_SRC)) { |
ee15ee5d DA |
549 | struct net_vrf *vrf = netdev_priv(dev); |
550 | ||
551 | rth = vrf->rth; | |
552 | atomic_inc(&rth->dst.__refcnt); | |
553 | } | |
554 | ||
555 | return rth; | |
556 | } | |
557 | ||
8cbb512c DA |
558 | /* called under rcu_read_lock */ |
559 | static void vrf_get_saddr(struct net_device *dev, struct flowi4 *fl4) | |
560 | { | |
561 | struct fib_result res = { .tclassid = 0 }; | |
562 | struct net *net = dev_net(dev); | |
563 | u32 orig_tos = fl4->flowi4_tos; | |
564 | u8 flags = fl4->flowi4_flags; | |
565 | u8 scope = fl4->flowi4_scope; | |
566 | u8 tos = RT_FL_TOS(fl4); | |
567 | ||
568 | if (unlikely(!fl4->daddr)) | |
569 | return; | |
570 | ||
571 | fl4->flowi4_flags |= FLOWI_FLAG_SKIP_NH_OIF; | |
572 | fl4->flowi4_iif = LOOPBACK_IFINDEX; | |
573 | fl4->flowi4_tos = tos & IPTOS_RT_MASK; | |
574 | fl4->flowi4_scope = ((tos & RTO_ONLINK) ? | |
575 | RT_SCOPE_LINK : RT_SCOPE_UNIVERSE); | |
576 | ||
577 | if (!fib_lookup(net, fl4, &res, 0)) { | |
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; | |
587 | } | |
588 | ||
ee15ee5d DA |
589 | static const struct l3mdev_ops vrf_l3mdev_ops = { |
590 | .l3mdev_fib_table = vrf_fib_table, | |
591 | .l3mdev_get_rtable = vrf_get_rtable, | |
8cbb512c | 592 | .l3mdev_get_saddr = vrf_get_saddr, |
ee15ee5d DA |
593 | }; |
594 | ||
193125db DA |
595 | static void vrf_get_drvinfo(struct net_device *dev, |
596 | struct ethtool_drvinfo *info) | |
597 | { | |
598 | strlcpy(info->driver, DRV_NAME, sizeof(info->driver)); | |
599 | strlcpy(info->version, DRV_VERSION, sizeof(info->version)); | |
600 | } | |
601 | ||
602 | static const struct ethtool_ops vrf_ethtool_ops = { | |
603 | .get_drvinfo = vrf_get_drvinfo, | |
604 | }; | |
605 | ||
606 | static void vrf_setup(struct net_device *dev) | |
607 | { | |
608 | ether_setup(dev); | |
609 | ||
610 | /* Initialize the device structure. */ | |
611 | dev->netdev_ops = &vrf_netdev_ops; | |
ee15ee5d | 612 | dev->l3mdev_ops = &vrf_l3mdev_ops; |
193125db DA |
613 | dev->ethtool_ops = &vrf_ethtool_ops; |
614 | dev->destructor = free_netdev; | |
615 | ||
616 | /* Fill in device structure with ethernet-generic values. */ | |
617 | eth_hw_addr_random(dev); | |
618 | ||
619 | /* don't acquire vrf device's netif_tx_lock when transmitting */ | |
620 | dev->features |= NETIF_F_LLTX; | |
621 | ||
622 | /* don't allow vrf devices to change network namespaces. */ | |
623 | dev->features |= NETIF_F_NETNS_LOCAL; | |
624 | } | |
625 | ||
626 | static int vrf_validate(struct nlattr *tb[], struct nlattr *data[]) | |
627 | { | |
628 | if (tb[IFLA_ADDRESS]) { | |
629 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) | |
630 | return -EINVAL; | |
631 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) | |
632 | return -EADDRNOTAVAIL; | |
633 | } | |
634 | return 0; | |
635 | } | |
636 | ||
637 | static void vrf_dellink(struct net_device *dev, struct list_head *head) | |
638 | { | |
193125db DA |
639 | unregister_netdevice_queue(dev, head); |
640 | } | |
641 | ||
642 | static int vrf_newlink(struct net *src_net, struct net_device *dev, | |
643 | struct nlattr *tb[], struct nlattr *data[]) | |
644 | { | |
645 | struct net_vrf *vrf = netdev_priv(dev); | |
193125db DA |
646 | int err; |
647 | ||
648 | if (!data || !data[IFLA_VRF_TABLE]) | |
649 | return -EINVAL; | |
650 | ||
651 | vrf->tb_id = nla_get_u32(data[IFLA_VRF_TABLE]); | |
652 | ||
007979ea | 653 | dev->priv_flags |= IFF_L3MDEV_MASTER; |
193125db | 654 | |
193125db DA |
655 | err = register_netdevice(dev); |
656 | if (err < 0) | |
657 | goto out_fail; | |
658 | ||
193125db DA |
659 | return 0; |
660 | ||
661 | out_fail: | |
193125db DA |
662 | free_netdev(dev); |
663 | return err; | |
664 | } | |
665 | ||
666 | static size_t vrf_nl_getsize(const struct net_device *dev) | |
667 | { | |
668 | return nla_total_size(sizeof(u32)); /* IFLA_VRF_TABLE */ | |
669 | } | |
670 | ||
671 | static int vrf_fillinfo(struct sk_buff *skb, | |
672 | const struct net_device *dev) | |
673 | { | |
674 | struct net_vrf *vrf = netdev_priv(dev); | |
675 | ||
676 | return nla_put_u32(skb, IFLA_VRF_TABLE, vrf->tb_id); | |
677 | } | |
678 | ||
679 | static const struct nla_policy vrf_nl_policy[IFLA_VRF_MAX + 1] = { | |
680 | [IFLA_VRF_TABLE] = { .type = NLA_U32 }, | |
681 | }; | |
682 | ||
683 | static struct rtnl_link_ops vrf_link_ops __read_mostly = { | |
684 | .kind = DRV_NAME, | |
685 | .priv_size = sizeof(struct net_vrf), | |
686 | ||
687 | .get_size = vrf_nl_getsize, | |
688 | .policy = vrf_nl_policy, | |
689 | .validate = vrf_validate, | |
690 | .fill_info = vrf_fillinfo, | |
691 | ||
692 | .newlink = vrf_newlink, | |
693 | .dellink = vrf_dellink, | |
694 | .setup = vrf_setup, | |
695 | .maxtype = IFLA_VRF_MAX, | |
696 | }; | |
697 | ||
698 | static int vrf_device_event(struct notifier_block *unused, | |
699 | unsigned long event, void *ptr) | |
700 | { | |
701 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
702 | ||
703 | /* only care about unregister events to drop slave references */ | |
704 | if (event == NETDEV_UNREGISTER) { | |
193125db DA |
705 | struct net_device *vrf_dev; |
706 | ||
fee6d4c7 | 707 | if (!netif_is_l3_slave(dev)) |
193125db DA |
708 | goto out; |
709 | ||
58aa9087 NA |
710 | vrf_dev = netdev_master_upper_dev_get(dev); |
711 | vrf_del_slave(vrf_dev, dev); | |
193125db DA |
712 | } |
713 | out: | |
714 | return NOTIFY_DONE; | |
715 | } | |
716 | ||
717 | static struct notifier_block vrf_notifier_block __read_mostly = { | |
718 | .notifier_call = vrf_device_event, | |
719 | }; | |
720 | ||
721 | static int __init vrf_init_module(void) | |
722 | { | |
723 | int rc; | |
724 | ||
725 | vrf_dst_ops.kmem_cachep = | |
726 | kmem_cache_create("vrf_ip_dst_cache", | |
727 | sizeof(struct rtable), 0, | |
e367da02 | 728 | SLAB_HWCACHE_ALIGN, |
193125db DA |
729 | NULL); |
730 | ||
731 | if (!vrf_dst_ops.kmem_cachep) | |
732 | return -ENOMEM; | |
733 | ||
734 | register_netdevice_notifier(&vrf_notifier_block); | |
735 | ||
736 | rc = rtnl_link_register(&vrf_link_ops); | |
737 | if (rc < 0) | |
738 | goto error; | |
739 | ||
740 | return 0; | |
741 | ||
742 | error: | |
743 | unregister_netdevice_notifier(&vrf_notifier_block); | |
744 | kmem_cache_destroy(vrf_dst_ops.kmem_cachep); | |
745 | return rc; | |
746 | } | |
747 | ||
748 | static void __exit vrf_cleanup_module(void) | |
749 | { | |
750 | rtnl_link_unregister(&vrf_link_ops); | |
751 | unregister_netdevice_notifier(&vrf_notifier_block); | |
752 | kmem_cache_destroy(vrf_dst_ops.kmem_cachep); | |
753 | } | |
754 | ||
755 | module_init(vrf_init_module); | |
756 | module_exit(vrf_cleanup_module); | |
757 | MODULE_AUTHOR("Shrijeet Mukherjee, David Ahern"); | |
758 | MODULE_DESCRIPTION("Device driver to instantiate VRF domains"); | |
759 | MODULE_LICENSE("GPL"); | |
760 | MODULE_ALIAS_RTNL_LINK(DRV_NAME); | |
761 | MODULE_VERSION(DRV_VERSION); |