Commit | Line | Data |
---|---|---|
193125db DA |
1 | /* |
2 | * vrf.c: device driver to encapsulate a VRF space | |
3 | * | |
4 | * Copyright (c) 2015 Cumulus Networks. All rights reserved. | |
5 | * Copyright (c) 2015 Shrijeet Mukherjee <shm@cumulusnetworks.com> | |
6 | * Copyright (c) 2015 David Ahern <dsa@cumulusnetworks.com> | |
7 | * | |
8 | * Based on dummy, team and ipvlan drivers | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | */ | |
15 | ||
16 | #include <linux/module.h> | |
17 | #include <linux/kernel.h> | |
18 | #include <linux/netdevice.h> | |
19 | #include <linux/etherdevice.h> | |
20 | #include <linux/ip.h> | |
21 | #include <linux/init.h> | |
22 | #include <linux/moduleparam.h> | |
23 | #include <linux/netfilter.h> | |
24 | #include <linux/rtnetlink.h> | |
25 | #include <net/rtnetlink.h> | |
26 | #include <linux/u64_stats_sync.h> | |
27 | #include <linux/hashtable.h> | |
28 | ||
29 | #include <linux/inetdevice.h> | |
8f58336d | 30 | #include <net/arp.h> |
193125db DA |
31 | #include <net/ip.h> |
32 | #include <net/ip_fib.h> | |
35402e31 | 33 | #include <net/ip6_fib.h> |
193125db | 34 | #include <net/ip6_route.h> |
193125db DA |
35 | #include <net/route.h> |
36 | #include <net/addrconf.h> | |
ee15ee5d | 37 | #include <net/l3mdev.h> |
193125db | 38 | |
8cbb512c DA |
39 | #define RT_FL_TOS(oldflp4) \ |
40 | ((oldflp4)->flowi4_tos & (IPTOS_RT_MASK | RTO_ONLINK)) | |
41 | ||
193125db DA |
42 | #define DRV_NAME "vrf" |
43 | #define DRV_VERSION "1.0" | |
44 | ||
193125db DA |
45 | #define vrf_master_get_rcu(dev) \ |
46 | ((struct net_device *)rcu_dereference(dev->rx_handler_data)) | |
47 | ||
ec539514 | 48 | struct net_vrf { |
ec539514 | 49 | struct rtable *rth; |
35402e31 | 50 | struct rt6_info *rt6; |
ec539514 DA |
51 | u32 tb_id; |
52 | }; | |
53 | ||
193125db DA |
54 | struct pcpu_dstats { |
55 | u64 tx_pkts; | |
56 | u64 tx_bytes; | |
57 | u64 tx_drps; | |
58 | u64 rx_pkts; | |
59 | u64 rx_bytes; | |
60 | struct u64_stats_sync syncp; | |
61 | }; | |
62 | ||
35402e31 DA |
63 | /* neighbor handling is done with actual device; do not want |
64 | * to flip skb->dev for those ndisc packets. This really fails | |
65 | * for multiple next protocols (e.g., NEXTHDR_HOP). But it is | |
66 | * a start. | |
67 | */ | |
68 | #if IS_ENABLED(CONFIG_IPV6) | |
69 | static bool check_ipv6_frame(const struct sk_buff *skb) | |
70 | { | |
65c38aa6 DA |
71 | const struct ipv6hdr *ipv6h; |
72 | struct ipv6hdr _ipv6h; | |
35402e31 DA |
73 | bool rc = true; |
74 | ||
65c38aa6 DA |
75 | ipv6h = skb_header_pointer(skb, 0, sizeof(_ipv6h), &_ipv6h); |
76 | if (!ipv6h) | |
35402e31 DA |
77 | goto out; |
78 | ||
79 | if (ipv6h->nexthdr == NEXTHDR_ICMP) { | |
80 | const struct icmp6hdr *icmph; | |
65c38aa6 | 81 | struct icmp6hdr _icmph; |
35402e31 | 82 | |
65c38aa6 DA |
83 | icmph = skb_header_pointer(skb, sizeof(_ipv6h), |
84 | sizeof(_icmph), &_icmph); | |
85 | if (!icmph) | |
35402e31 DA |
86 | goto out; |
87 | ||
35402e31 DA |
88 | switch (icmph->icmp6_type) { |
89 | case NDISC_ROUTER_SOLICITATION: | |
90 | case NDISC_ROUTER_ADVERTISEMENT: | |
91 | case NDISC_NEIGHBOUR_SOLICITATION: | |
92 | case NDISC_NEIGHBOUR_ADVERTISEMENT: | |
93 | case NDISC_REDIRECT: | |
94 | rc = false; | |
95 | break; | |
96 | } | |
97 | } | |
98 | ||
99 | out: | |
100 | return rc; | |
101 | } | |
102 | #else | |
103 | static bool check_ipv6_frame(const struct sk_buff *skb) | |
104 | { | |
105 | return false; | |
106 | } | |
107 | #endif | |
108 | ||
193125db DA |
109 | static bool is_ip_rx_frame(struct sk_buff *skb) |
110 | { | |
111 | switch (skb->protocol) { | |
112 | case htons(ETH_P_IP): | |
193125db | 113 | return true; |
35402e31 DA |
114 | case htons(ETH_P_IPV6): |
115 | return check_ipv6_frame(skb); | |
193125db DA |
116 | } |
117 | return false; | |
118 | } | |
119 | ||
57b8efa1 NA |
120 | static void vrf_tx_error(struct net_device *vrf_dev, struct sk_buff *skb) |
121 | { | |
122 | vrf_dev->stats.tx_errors++; | |
123 | kfree_skb(skb); | |
124 | } | |
125 | ||
193125db DA |
126 | /* note: already called with rcu_read_lock */ |
127 | static rx_handler_result_t vrf_handle_frame(struct sk_buff **pskb) | |
128 | { | |
129 | struct sk_buff *skb = *pskb; | |
130 | ||
131 | if (is_ip_rx_frame(skb)) { | |
132 | struct net_device *dev = vrf_master_get_rcu(skb->dev); | |
133 | struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats); | |
134 | ||
135 | u64_stats_update_begin(&dstats->syncp); | |
136 | dstats->rx_pkts++; | |
137 | dstats->rx_bytes += skb->len; | |
138 | u64_stats_update_end(&dstats->syncp); | |
139 | ||
140 | skb->dev = dev; | |
141 | ||
142 | return RX_HANDLER_ANOTHER; | |
143 | } | |
144 | return RX_HANDLER_PASS; | |
145 | } | |
146 | ||
147 | static struct rtnl_link_stats64 *vrf_get_stats64(struct net_device *dev, | |
148 | struct rtnl_link_stats64 *stats) | |
149 | { | |
150 | int i; | |
151 | ||
152 | for_each_possible_cpu(i) { | |
153 | const struct pcpu_dstats *dstats; | |
154 | u64 tbytes, tpkts, tdrops, rbytes, rpkts; | |
155 | unsigned int start; | |
156 | ||
157 | dstats = per_cpu_ptr(dev->dstats, i); | |
158 | do { | |
159 | start = u64_stats_fetch_begin_irq(&dstats->syncp); | |
160 | tbytes = dstats->tx_bytes; | |
161 | tpkts = dstats->tx_pkts; | |
162 | tdrops = dstats->tx_drps; | |
163 | rbytes = dstats->rx_bytes; | |
164 | rpkts = dstats->rx_pkts; | |
165 | } while (u64_stats_fetch_retry_irq(&dstats->syncp, start)); | |
166 | stats->tx_bytes += tbytes; | |
167 | stats->tx_packets += tpkts; | |
168 | stats->tx_dropped += tdrops; | |
169 | stats->rx_bytes += rbytes; | |
170 | stats->rx_packets += rpkts; | |
171 | } | |
172 | return stats; | |
173 | } | |
174 | ||
35402e31 DA |
175 | #if IS_ENABLED(CONFIG_IPV6) |
176 | static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb, | |
177 | struct net_device *dev) | |
178 | { | |
179 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
180 | struct net *net = dev_net(skb->dev); | |
181 | struct flowi6 fl6 = { | |
182 | /* needed to match OIF rule */ | |
183 | .flowi6_oif = dev->ifindex, | |
184 | .flowi6_iif = LOOPBACK_IFINDEX, | |
185 | .daddr = iph->daddr, | |
186 | .saddr = iph->saddr, | |
187 | .flowlabel = ip6_flowinfo(iph), | |
188 | .flowi6_mark = skb->mark, | |
189 | .flowi6_proto = iph->nexthdr, | |
190 | .flowi6_flags = FLOWI_FLAG_L3MDEV_SRC | FLOWI_FLAG_SKIP_NH_OIF, | |
191 | }; | |
192 | int ret = NET_XMIT_DROP; | |
193 | struct dst_entry *dst; | |
194 | struct dst_entry *dst_null = &net->ipv6.ip6_null_entry->dst; | |
195 | ||
196 | dst = ip6_route_output(net, NULL, &fl6); | |
197 | if (dst == dst_null) | |
198 | goto err; | |
199 | ||
200 | skb_dst_drop(skb); | |
201 | skb_dst_set(skb, dst); | |
202 | ||
203 | ret = ip6_local_out(net, skb->sk, skb); | |
204 | if (unlikely(net_xmit_eval(ret))) | |
205 | dev->stats.tx_errors++; | |
206 | else | |
207 | ret = NET_XMIT_SUCCESS; | |
208 | ||
209 | return ret; | |
210 | err: | |
211 | vrf_tx_error(dev, skb); | |
212 | return NET_XMIT_DROP; | |
213 | } | |
214 | #else | |
193125db DA |
215 | static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb, |
216 | struct net_device *dev) | |
217 | { | |
57b8efa1 NA |
218 | vrf_tx_error(dev, skb); |
219 | return NET_XMIT_DROP; | |
193125db | 220 | } |
35402e31 | 221 | #endif |
193125db DA |
222 | |
223 | static int vrf_send_v4_prep(struct sk_buff *skb, struct flowi4 *fl4, | |
224 | struct net_device *vrf_dev) | |
225 | { | |
226 | struct rtable *rt; | |
227 | int err = 1; | |
228 | ||
229 | rt = ip_route_output_flow(dev_net(vrf_dev), fl4, NULL); | |
230 | if (IS_ERR(rt)) | |
231 | goto out; | |
232 | ||
233 | /* TO-DO: what about broadcast ? */ | |
234 | if (rt->rt_type != RTN_UNICAST && rt->rt_type != RTN_LOCAL) { | |
235 | ip_rt_put(rt); | |
236 | goto out; | |
237 | } | |
238 | ||
239 | skb_dst_drop(skb); | |
240 | skb_dst_set(skb, &rt->dst); | |
241 | err = 0; | |
242 | out: | |
243 | return err; | |
244 | } | |
245 | ||
246 | static netdev_tx_t vrf_process_v4_outbound(struct sk_buff *skb, | |
247 | struct net_device *vrf_dev) | |
248 | { | |
249 | struct iphdr *ip4h = ip_hdr(skb); | |
250 | int ret = NET_XMIT_DROP; | |
251 | struct flowi4 fl4 = { | |
252 | /* needed to match OIF rule */ | |
253 | .flowi4_oif = vrf_dev->ifindex, | |
254 | .flowi4_iif = LOOPBACK_IFINDEX, | |
255 | .flowi4_tos = RT_TOS(ip4h->tos), | |
6e2895a8 | 256 | .flowi4_flags = FLOWI_FLAG_ANYSRC | FLOWI_FLAG_L3MDEV_SRC | |
58189ca7 | 257 | FLOWI_FLAG_SKIP_NH_OIF, |
193125db DA |
258 | .daddr = ip4h->daddr, |
259 | }; | |
260 | ||
261 | if (vrf_send_v4_prep(skb, &fl4, vrf_dev)) | |
262 | goto err; | |
263 | ||
264 | if (!ip4h->saddr) { | |
265 | ip4h->saddr = inet_select_addr(skb_dst(skb)->dev, 0, | |
266 | RT_SCOPE_LINK); | |
267 | } | |
268 | ||
33224b16 | 269 | ret = ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb); |
193125db DA |
270 | if (unlikely(net_xmit_eval(ret))) |
271 | vrf_dev->stats.tx_errors++; | |
272 | else | |
273 | ret = NET_XMIT_SUCCESS; | |
274 | ||
275 | out: | |
276 | return ret; | |
277 | err: | |
57b8efa1 | 278 | vrf_tx_error(vrf_dev, skb); |
193125db DA |
279 | goto out; |
280 | } | |
281 | ||
282 | static netdev_tx_t is_ip_tx_frame(struct sk_buff *skb, struct net_device *dev) | |
283 | { | |
8f58336d DA |
284 | /* strip the ethernet header added for pass through VRF device */ |
285 | __skb_pull(skb, skb_network_offset(skb)); | |
286 | ||
193125db DA |
287 | switch (skb->protocol) { |
288 | case htons(ETH_P_IP): | |
289 | return vrf_process_v4_outbound(skb, dev); | |
290 | case htons(ETH_P_IPV6): | |
291 | return vrf_process_v6_outbound(skb, dev); | |
292 | default: | |
57b8efa1 | 293 | vrf_tx_error(dev, skb); |
193125db DA |
294 | return NET_XMIT_DROP; |
295 | } | |
296 | } | |
297 | ||
298 | static netdev_tx_t vrf_xmit(struct sk_buff *skb, struct net_device *dev) | |
299 | { | |
300 | netdev_tx_t ret = is_ip_tx_frame(skb, dev); | |
301 | ||
302 | if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { | |
303 | struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats); | |
304 | ||
305 | u64_stats_update_begin(&dstats->syncp); | |
306 | dstats->tx_pkts++; | |
307 | dstats->tx_bytes += skb->len; | |
308 | u64_stats_update_end(&dstats->syncp); | |
309 | } else { | |
310 | this_cpu_inc(dev->dstats->tx_drps); | |
311 | } | |
312 | ||
313 | return ret; | |
314 | } | |
315 | ||
35402e31 | 316 | #if IS_ENABLED(CONFIG_IPV6) |
35402e31 DA |
317 | /* modelled after ip6_finish_output2 */ |
318 | static int vrf_finish_output6(struct net *net, struct sock *sk, | |
319 | struct sk_buff *skb) | |
320 | { | |
321 | struct dst_entry *dst = skb_dst(skb); | |
322 | struct net_device *dev = dst->dev; | |
323 | struct neighbour *neigh; | |
324 | struct in6_addr *nexthop; | |
325 | int ret; | |
326 | ||
327 | skb->protocol = htons(ETH_P_IPV6); | |
328 | skb->dev = dev; | |
329 | ||
330 | rcu_read_lock_bh(); | |
331 | nexthop = rt6_nexthop((struct rt6_info *)dst, &ipv6_hdr(skb)->daddr); | |
332 | neigh = __ipv6_neigh_lookup_noref(dst->dev, nexthop); | |
333 | if (unlikely(!neigh)) | |
334 | neigh = __neigh_create(&nd_tbl, nexthop, dst->dev, false); | |
335 | if (!IS_ERR(neigh)) { | |
336 | ret = dst_neigh_output(dst, neigh, skb); | |
337 | rcu_read_unlock_bh(); | |
338 | return ret; | |
339 | } | |
340 | rcu_read_unlock_bh(); | |
341 | ||
342 | IP6_INC_STATS(dev_net(dst->dev), | |
343 | ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES); | |
344 | kfree_skb(skb); | |
345 | return -EINVAL; | |
346 | } | |
347 | ||
348 | /* modelled after ip6_output */ | |
349 | static int vrf_output6(struct net *net, struct sock *sk, struct sk_buff *skb) | |
350 | { | |
351 | return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING, | |
352 | net, sk, skb, NULL, skb_dst(skb)->dev, | |
353 | vrf_finish_output6, | |
354 | !(IP6CB(skb)->flags & IP6SKB_REROUTED)); | |
355 | } | |
356 | ||
9ab179d8 | 357 | static void vrf_rt6_release(struct net_vrf *vrf) |
35402e31 | 358 | { |
9ab179d8 | 359 | dst_release(&vrf->rt6->dst); |
35402e31 DA |
360 | vrf->rt6 = NULL; |
361 | } | |
362 | ||
363 | static int vrf_rt6_create(struct net_device *dev) | |
364 | { | |
365 | struct net_vrf *vrf = netdev_priv(dev); | |
9ab179d8 | 366 | struct net *net = dev_net(dev); |
b3b4663c | 367 | struct fib6_table *rt6i_table; |
35402e31 | 368 | struct rt6_info *rt6; |
35402e31 DA |
369 | int rc = -ENOMEM; |
370 | ||
b3b4663c DA |
371 | rt6i_table = fib6_new_table(net, vrf->tb_id); |
372 | if (!rt6i_table) | |
373 | goto out; | |
374 | ||
9ab179d8 DA |
375 | rt6 = ip6_dst_alloc(net, dev, |
376 | DST_HOST | DST_NOPOLICY | DST_NOXFRM | DST_NOCACHE); | |
35402e31 DA |
377 | if (!rt6) |
378 | goto out; | |
379 | ||
9ab179d8 | 380 | dst_hold(&rt6->dst); |
b3b4663c DA |
381 | |
382 | rt6->rt6i_table = rt6i_table; | |
383 | rt6->dst.output = vrf_output6; | |
35402e31 DA |
384 | vrf->rt6 = rt6; |
385 | rc = 0; | |
386 | out: | |
387 | return rc; | |
388 | } | |
389 | #else | |
9ab179d8 | 390 | static void vrf_rt6_release(struct net_vrf *vrf) |
35402e31 DA |
391 | { |
392 | } | |
393 | ||
394 | static int vrf_rt6_create(struct net_device *dev) | |
395 | { | |
396 | return 0; | |
397 | } | |
398 | #endif | |
399 | ||
8f58336d | 400 | /* modelled after ip_finish_output2 */ |
0c4b51f0 | 401 | static int vrf_finish_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
193125db | 402 | { |
8f58336d DA |
403 | struct dst_entry *dst = skb_dst(skb); |
404 | struct rtable *rt = (struct rtable *)dst; | |
405 | struct net_device *dev = dst->dev; | |
406 | unsigned int hh_len = LL_RESERVED_SPACE(dev); | |
407 | struct neighbour *neigh; | |
408 | u32 nexthop; | |
409 | int ret = -EINVAL; | |
410 | ||
411 | /* Be paranoid, rather than too clever. */ | |
412 | if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) { | |
413 | struct sk_buff *skb2; | |
414 | ||
415 | skb2 = skb_realloc_headroom(skb, LL_RESERVED_SPACE(dev)); | |
416 | if (!skb2) { | |
417 | ret = -ENOMEM; | |
418 | goto err; | |
419 | } | |
420 | if (skb->sk) | |
421 | skb_set_owner_w(skb2, skb->sk); | |
422 | ||
423 | consume_skb(skb); | |
424 | skb = skb2; | |
425 | } | |
426 | ||
427 | rcu_read_lock_bh(); | |
428 | ||
429 | nexthop = (__force u32)rt_nexthop(rt, ip_hdr(skb)->daddr); | |
430 | neigh = __ipv4_neigh_lookup_noref(dev, nexthop); | |
431 | if (unlikely(!neigh)) | |
432 | neigh = __neigh_create(&arp_tbl, &nexthop, dev, false); | |
433 | if (!IS_ERR(neigh)) | |
434 | ret = dst_neigh_output(dst, neigh, skb); | |
435 | ||
436 | rcu_read_unlock_bh(); | |
437 | err: | |
438 | if (unlikely(ret < 0)) | |
439 | vrf_tx_error(skb->dev, skb); | |
440 | return ret; | |
193125db DA |
441 | } |
442 | ||
ede2059d | 443 | static int vrf_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
193125db DA |
444 | { |
445 | struct net_device *dev = skb_dst(skb)->dev; | |
446 | ||
29a26a56 | 447 | IP_UPD_PO_STATS(net, IPSTATS_MIB_OUT, skb->len); |
193125db DA |
448 | |
449 | skb->dev = dev; | |
450 | skb->protocol = htons(ETH_P_IP); | |
451 | ||
29a26a56 EB |
452 | return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING, |
453 | net, sk, skb, NULL, dev, | |
8f58336d | 454 | vrf_finish_output, |
193125db DA |
455 | !(IPCB(skb)->flags & IPSKB_REROUTED)); |
456 | } | |
457 | ||
9ab179d8 | 458 | static void vrf_rtable_release(struct net_vrf *vrf) |
193125db DA |
459 | { |
460 | struct dst_entry *dst = (struct dst_entry *)vrf->rth; | |
461 | ||
9ab179d8 | 462 | dst_release(dst); |
193125db DA |
463 | vrf->rth = NULL; |
464 | } | |
465 | ||
466 | static struct rtable *vrf_rtable_create(struct net_device *dev) | |
467 | { | |
b7503e0c | 468 | struct net_vrf *vrf = netdev_priv(dev); |
193125db DA |
469 | struct rtable *rth; |
470 | ||
b3b4663c DA |
471 | if (!fib_new_table(dev_net(dev), vrf->tb_id)) |
472 | return NULL; | |
473 | ||
9ab179d8 | 474 | rth = rt_dst_alloc(dev, 0, RTN_UNICAST, 1, 1, 0); |
193125db DA |
475 | if (rth) { |
476 | rth->dst.output = vrf_output; | |
b7503e0c | 477 | rth->rt_table_id = vrf->tb_id; |
193125db DA |
478 | } |
479 | ||
480 | return rth; | |
481 | } | |
482 | ||
483 | /**************************** device handling ********************/ | |
484 | ||
485 | /* cycle interface to flush neighbor cache and move routes across tables */ | |
486 | static void cycle_netdev(struct net_device *dev) | |
487 | { | |
488 | unsigned int flags = dev->flags; | |
489 | int ret; | |
490 | ||
491 | if (!netif_running(dev)) | |
492 | return; | |
493 | ||
494 | ret = dev_change_flags(dev, flags & ~IFF_UP); | |
495 | if (ret >= 0) | |
496 | ret = dev_change_flags(dev, flags); | |
497 | ||
498 | if (ret < 0) { | |
499 | netdev_err(dev, | |
500 | "Failed to cycle device %s; route tables might be wrong!\n", | |
501 | dev->name); | |
502 | } | |
503 | } | |
504 | ||
193125db DA |
505 | static int do_vrf_add_slave(struct net_device *dev, struct net_device *port_dev) |
506 | { | |
bad53162 | 507 | int ret; |
193125db | 508 | |
193125db DA |
509 | /* register the packet handler for slave ports */ |
510 | ret = netdev_rx_handler_register(port_dev, vrf_handle_frame, dev); | |
511 | if (ret) { | |
512 | netdev_err(port_dev, | |
513 | "Device %s failed to register rx_handler\n", | |
514 | port_dev->name); | |
15df5e71 | 515 | goto out_fail; |
193125db DA |
516 | } |
517 | ||
29bf24af | 518 | ret = netdev_master_upper_dev_link(port_dev, dev, NULL, NULL); |
193125db DA |
519 | if (ret < 0) |
520 | goto out_unregister; | |
521 | ||
fee6d4c7 | 522 | port_dev->priv_flags |= IFF_L3MDEV_SLAVE; |
193125db DA |
523 | cycle_netdev(port_dev); |
524 | ||
525 | return 0; | |
526 | ||
527 | out_unregister: | |
528 | netdev_rx_handler_unregister(port_dev); | |
193125db | 529 | out_fail: |
193125db DA |
530 | return ret; |
531 | } | |
532 | ||
533 | static int vrf_add_slave(struct net_device *dev, struct net_device *port_dev) | |
534 | { | |
fee6d4c7 | 535 | if (netif_is_l3_master(port_dev) || netif_is_l3_slave(port_dev)) |
193125db DA |
536 | return -EINVAL; |
537 | ||
538 | return do_vrf_add_slave(dev, port_dev); | |
539 | } | |
540 | ||
541 | /* inverse of do_vrf_add_slave */ | |
542 | static int do_vrf_del_slave(struct net_device *dev, struct net_device *port_dev) | |
543 | { | |
193125db | 544 | netdev_upper_dev_unlink(port_dev, dev); |
fee6d4c7 | 545 | port_dev->priv_flags &= ~IFF_L3MDEV_SLAVE; |
193125db DA |
546 | |
547 | netdev_rx_handler_unregister(port_dev); | |
548 | ||
193125db DA |
549 | cycle_netdev(port_dev); |
550 | ||
193125db DA |
551 | return 0; |
552 | } | |
553 | ||
554 | static int vrf_del_slave(struct net_device *dev, struct net_device *port_dev) | |
555 | { | |
193125db DA |
556 | return do_vrf_del_slave(dev, port_dev); |
557 | } | |
558 | ||
559 | static void vrf_dev_uninit(struct net_device *dev) | |
560 | { | |
561 | struct net_vrf *vrf = netdev_priv(dev); | |
bad53162 NA |
562 | struct net_device *port_dev; |
563 | struct list_head *iter; | |
193125db | 564 | |
9ab179d8 DA |
565 | vrf_rtable_release(vrf); |
566 | vrf_rt6_release(vrf); | |
193125db | 567 | |
bad53162 NA |
568 | netdev_for_each_lower_dev(dev, port_dev, iter) |
569 | vrf_del_slave(dev, port_dev); | |
193125db | 570 | |
3a4a27d3 | 571 | free_percpu(dev->dstats); |
193125db DA |
572 | dev->dstats = NULL; |
573 | } | |
574 | ||
575 | static int vrf_dev_init(struct net_device *dev) | |
576 | { | |
577 | struct net_vrf *vrf = netdev_priv(dev); | |
578 | ||
193125db DA |
579 | dev->dstats = netdev_alloc_pcpu_stats(struct pcpu_dstats); |
580 | if (!dev->dstats) | |
581 | goto out_nomem; | |
582 | ||
583 | /* create the default dst which points back to us */ | |
584 | vrf->rth = vrf_rtable_create(dev); | |
585 | if (!vrf->rth) | |
586 | goto out_stats; | |
587 | ||
35402e31 DA |
588 | if (vrf_rt6_create(dev) != 0) |
589 | goto out_rth; | |
590 | ||
193125db DA |
591 | dev->flags = IFF_MASTER | IFF_NOARP; |
592 | ||
593 | return 0; | |
594 | ||
35402e31 | 595 | out_rth: |
9ab179d8 | 596 | vrf_rtable_release(vrf); |
193125db DA |
597 | out_stats: |
598 | free_percpu(dev->dstats); | |
599 | dev->dstats = NULL; | |
600 | out_nomem: | |
601 | return -ENOMEM; | |
602 | } | |
603 | ||
604 | static const struct net_device_ops vrf_netdev_ops = { | |
605 | .ndo_init = vrf_dev_init, | |
606 | .ndo_uninit = vrf_dev_uninit, | |
607 | .ndo_start_xmit = vrf_xmit, | |
608 | .ndo_get_stats64 = vrf_get_stats64, | |
609 | .ndo_add_slave = vrf_add_slave, | |
610 | .ndo_del_slave = vrf_del_slave, | |
611 | }; | |
612 | ||
ee15ee5d DA |
613 | static u32 vrf_fib_table(const struct net_device *dev) |
614 | { | |
615 | struct net_vrf *vrf = netdev_priv(dev); | |
616 | ||
617 | return vrf->tb_id; | |
618 | } | |
619 | ||
620 | static struct rtable *vrf_get_rtable(const struct net_device *dev, | |
621 | const struct flowi4 *fl4) | |
622 | { | |
623 | struct rtable *rth = NULL; | |
624 | ||
6e2895a8 | 625 | if (!(fl4->flowi4_flags & FLOWI_FLAG_L3MDEV_SRC)) { |
ee15ee5d DA |
626 | struct net_vrf *vrf = netdev_priv(dev); |
627 | ||
628 | rth = vrf->rth; | |
9ab179d8 | 629 | dst_hold(&rth->dst); |
ee15ee5d DA |
630 | } |
631 | ||
632 | return rth; | |
633 | } | |
634 | ||
8cbb512c | 635 | /* called under rcu_read_lock */ |
b5bdacf3 | 636 | static int vrf_get_saddr(struct net_device *dev, struct flowi4 *fl4) |
8cbb512c DA |
637 | { |
638 | struct fib_result res = { .tclassid = 0 }; | |
639 | struct net *net = dev_net(dev); | |
640 | u32 orig_tos = fl4->flowi4_tos; | |
641 | u8 flags = fl4->flowi4_flags; | |
642 | u8 scope = fl4->flowi4_scope; | |
643 | u8 tos = RT_FL_TOS(fl4); | |
b5bdacf3 | 644 | int rc; |
8cbb512c DA |
645 | |
646 | if (unlikely(!fl4->daddr)) | |
b5bdacf3 | 647 | return 0; |
8cbb512c DA |
648 | |
649 | fl4->flowi4_flags |= FLOWI_FLAG_SKIP_NH_OIF; | |
650 | fl4->flowi4_iif = LOOPBACK_IFINDEX; | |
651 | fl4->flowi4_tos = tos & IPTOS_RT_MASK; | |
652 | fl4->flowi4_scope = ((tos & RTO_ONLINK) ? | |
653 | RT_SCOPE_LINK : RT_SCOPE_UNIVERSE); | |
654 | ||
b5bdacf3 DA |
655 | rc = fib_lookup(net, fl4, &res, 0); |
656 | if (!rc) { | |
8cbb512c DA |
657 | if (res.type == RTN_LOCAL) |
658 | fl4->saddr = res.fi->fib_prefsrc ? : fl4->daddr; | |
659 | else | |
660 | fib_select_path(net, &res, fl4, -1); | |
661 | } | |
662 | ||
663 | fl4->flowi4_flags = flags; | |
664 | fl4->flowi4_tos = orig_tos; | |
665 | fl4->flowi4_scope = scope; | |
b5bdacf3 DA |
666 | |
667 | return rc; | |
8cbb512c DA |
668 | } |
669 | ||
35402e31 DA |
670 | #if IS_ENABLED(CONFIG_IPV6) |
671 | static struct dst_entry *vrf_get_rt6_dst(const struct net_device *dev, | |
672 | const struct flowi6 *fl6) | |
673 | { | |
674 | struct rt6_info *rt = NULL; | |
675 | ||
676 | if (!(fl6->flowi6_flags & FLOWI_FLAG_L3MDEV_SRC)) { | |
677 | struct net_vrf *vrf = netdev_priv(dev); | |
678 | ||
679 | rt = vrf->rt6; | |
9ab179d8 | 680 | dst_hold(&rt->dst); |
35402e31 DA |
681 | } |
682 | ||
683 | return (struct dst_entry *)rt; | |
684 | } | |
685 | #endif | |
686 | ||
ee15ee5d DA |
687 | static const struct l3mdev_ops vrf_l3mdev_ops = { |
688 | .l3mdev_fib_table = vrf_fib_table, | |
689 | .l3mdev_get_rtable = vrf_get_rtable, | |
8cbb512c | 690 | .l3mdev_get_saddr = vrf_get_saddr, |
35402e31 DA |
691 | #if IS_ENABLED(CONFIG_IPV6) |
692 | .l3mdev_get_rt6_dst = vrf_get_rt6_dst, | |
693 | #endif | |
ee15ee5d DA |
694 | }; |
695 | ||
193125db DA |
696 | static void vrf_get_drvinfo(struct net_device *dev, |
697 | struct ethtool_drvinfo *info) | |
698 | { | |
699 | strlcpy(info->driver, DRV_NAME, sizeof(info->driver)); | |
700 | strlcpy(info->version, DRV_VERSION, sizeof(info->version)); | |
701 | } | |
702 | ||
703 | static const struct ethtool_ops vrf_ethtool_ops = { | |
704 | .get_drvinfo = vrf_get_drvinfo, | |
705 | }; | |
706 | ||
707 | static void vrf_setup(struct net_device *dev) | |
708 | { | |
709 | ether_setup(dev); | |
710 | ||
711 | /* Initialize the device structure. */ | |
712 | dev->netdev_ops = &vrf_netdev_ops; | |
ee15ee5d | 713 | dev->l3mdev_ops = &vrf_l3mdev_ops; |
193125db DA |
714 | dev->ethtool_ops = &vrf_ethtool_ops; |
715 | dev->destructor = free_netdev; | |
716 | ||
717 | /* Fill in device structure with ethernet-generic values. */ | |
718 | eth_hw_addr_random(dev); | |
719 | ||
720 | /* don't acquire vrf device's netif_tx_lock when transmitting */ | |
721 | dev->features |= NETIF_F_LLTX; | |
722 | ||
723 | /* don't allow vrf devices to change network namespaces. */ | |
724 | dev->features |= NETIF_F_NETNS_LOCAL; | |
725 | } | |
726 | ||
727 | static int vrf_validate(struct nlattr *tb[], struct nlattr *data[]) | |
728 | { | |
729 | if (tb[IFLA_ADDRESS]) { | |
730 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) | |
731 | return -EINVAL; | |
732 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) | |
733 | return -EADDRNOTAVAIL; | |
734 | } | |
735 | return 0; | |
736 | } | |
737 | ||
738 | static void vrf_dellink(struct net_device *dev, struct list_head *head) | |
739 | { | |
193125db DA |
740 | unregister_netdevice_queue(dev, head); |
741 | } | |
742 | ||
743 | static int vrf_newlink(struct net *src_net, struct net_device *dev, | |
744 | struct nlattr *tb[], struct nlattr *data[]) | |
745 | { | |
746 | struct net_vrf *vrf = netdev_priv(dev); | |
193125db DA |
747 | |
748 | if (!data || !data[IFLA_VRF_TABLE]) | |
749 | return -EINVAL; | |
750 | ||
751 | vrf->tb_id = nla_get_u32(data[IFLA_VRF_TABLE]); | |
752 | ||
007979ea | 753 | dev->priv_flags |= IFF_L3MDEV_MASTER; |
193125db | 754 | |
7f109f7c | 755 | return register_netdevice(dev); |
193125db DA |
756 | } |
757 | ||
758 | static size_t vrf_nl_getsize(const struct net_device *dev) | |
759 | { | |
760 | return nla_total_size(sizeof(u32)); /* IFLA_VRF_TABLE */ | |
761 | } | |
762 | ||
763 | static int vrf_fillinfo(struct sk_buff *skb, | |
764 | const struct net_device *dev) | |
765 | { | |
766 | struct net_vrf *vrf = netdev_priv(dev); | |
767 | ||
768 | return nla_put_u32(skb, IFLA_VRF_TABLE, vrf->tb_id); | |
769 | } | |
770 | ||
67eb0331 DA |
771 | static size_t vrf_get_slave_size(const struct net_device *bond_dev, |
772 | const struct net_device *slave_dev) | |
773 | { | |
774 | return nla_total_size(sizeof(u32)); /* IFLA_VRF_PORT_TABLE */ | |
775 | } | |
776 | ||
777 | static int vrf_fill_slave_info(struct sk_buff *skb, | |
778 | const struct net_device *vrf_dev, | |
779 | const struct net_device *slave_dev) | |
780 | { | |
781 | struct net_vrf *vrf = netdev_priv(vrf_dev); | |
782 | ||
783 | if (nla_put_u32(skb, IFLA_VRF_PORT_TABLE, vrf->tb_id)) | |
784 | return -EMSGSIZE; | |
785 | ||
786 | return 0; | |
787 | } | |
788 | ||
193125db DA |
789 | static const struct nla_policy vrf_nl_policy[IFLA_VRF_MAX + 1] = { |
790 | [IFLA_VRF_TABLE] = { .type = NLA_U32 }, | |
791 | }; | |
792 | ||
793 | static struct rtnl_link_ops vrf_link_ops __read_mostly = { | |
794 | .kind = DRV_NAME, | |
795 | .priv_size = sizeof(struct net_vrf), | |
796 | ||
797 | .get_size = vrf_nl_getsize, | |
798 | .policy = vrf_nl_policy, | |
799 | .validate = vrf_validate, | |
800 | .fill_info = vrf_fillinfo, | |
801 | ||
67eb0331 DA |
802 | .get_slave_size = vrf_get_slave_size, |
803 | .fill_slave_info = vrf_fill_slave_info, | |
804 | ||
193125db DA |
805 | .newlink = vrf_newlink, |
806 | .dellink = vrf_dellink, | |
807 | .setup = vrf_setup, | |
808 | .maxtype = IFLA_VRF_MAX, | |
809 | }; | |
810 | ||
811 | static int vrf_device_event(struct notifier_block *unused, | |
812 | unsigned long event, void *ptr) | |
813 | { | |
814 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
815 | ||
816 | /* only care about unregister events to drop slave references */ | |
817 | if (event == NETDEV_UNREGISTER) { | |
193125db DA |
818 | struct net_device *vrf_dev; |
819 | ||
fee6d4c7 | 820 | if (!netif_is_l3_slave(dev)) |
193125db DA |
821 | goto out; |
822 | ||
58aa9087 NA |
823 | vrf_dev = netdev_master_upper_dev_get(dev); |
824 | vrf_del_slave(vrf_dev, dev); | |
193125db DA |
825 | } |
826 | out: | |
827 | return NOTIFY_DONE; | |
828 | } | |
829 | ||
830 | static struct notifier_block vrf_notifier_block __read_mostly = { | |
831 | .notifier_call = vrf_device_event, | |
832 | }; | |
833 | ||
834 | static int __init vrf_init_module(void) | |
835 | { | |
836 | int rc; | |
837 | ||
193125db DA |
838 | register_netdevice_notifier(&vrf_notifier_block); |
839 | ||
840 | rc = rtnl_link_register(&vrf_link_ops); | |
841 | if (rc < 0) | |
842 | goto error; | |
843 | ||
844 | return 0; | |
845 | ||
846 | error: | |
847 | unregister_netdevice_notifier(&vrf_notifier_block); | |
193125db DA |
848 | return rc; |
849 | } | |
850 | ||
193125db | 851 | module_init(vrf_init_module); |
193125db DA |
852 | MODULE_AUTHOR("Shrijeet Mukherjee, David Ahern"); |
853 | MODULE_DESCRIPTION("Device driver to instantiate VRF domains"); | |
854 | MODULE_LICENSE("GPL"); | |
855 | MODULE_ALIAS_RTNL_LINK(DRV_NAME); | |
856 | MODULE_VERSION(DRV_VERSION); |