Commit | Line | Data |
---|---|---|
2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
193125db DA |
2 | /* |
3 | * vrf.c: device driver to encapsulate a VRF space | |
4 | * | |
5 | * Copyright (c) 2015 Cumulus Networks. All rights reserved. | |
6 | * Copyright (c) 2015 Shrijeet Mukherjee <shm@cumulusnetworks.com> | |
7 | * Copyright (c) 2015 David Ahern <dsa@cumulusnetworks.com> | |
8 | * | |
9 | * Based on dummy, team and ipvlan drivers | |
193125db DA |
10 | */ |
11 | ||
12 | #include <linux/module.h> | |
13 | #include <linux/kernel.h> | |
14 | #include <linux/netdevice.h> | |
15 | #include <linux/etherdevice.h> | |
16 | #include <linux/ip.h> | |
17 | #include <linux/init.h> | |
18 | #include <linux/moduleparam.h> | |
19 | #include <linux/netfilter.h> | |
20 | #include <linux/rtnetlink.h> | |
21 | #include <net/rtnetlink.h> | |
22 | #include <linux/u64_stats_sync.h> | |
23 | #include <linux/hashtable.h> | |
24 | ||
25 | #include <linux/inetdevice.h> | |
8f58336d | 26 | #include <net/arp.h> |
193125db DA |
27 | #include <net/ip.h> |
28 | #include <net/ip_fib.h> | |
35402e31 | 29 | #include <net/ip6_fib.h> |
193125db | 30 | #include <net/ip6_route.h> |
193125db DA |
31 | #include <net/route.h> |
32 | #include <net/addrconf.h> | |
ee15ee5d | 33 | #include <net/l3mdev.h> |
1aa6c4f6 | 34 | #include <net/fib_rules.h> |
097d3c95 | 35 | #include <net/netns/generic.h> |
193125db DA |
36 | |
37 | #define DRV_NAME "vrf" | |
38 | #define DRV_VERSION "1.0" | |
39 | ||
1aa6c4f6 | 40 | #define FIB_RULE_PREF 1000 /* default preference for FIB rules */ |
097d3c95 DA |
41 | |
42 | static unsigned int vrf_net_id; | |
1aa6c4f6 | 43 | |
ec539514 | 44 | struct net_vrf { |
b0e95ccd DA |
45 | struct rtable __rcu *rth; |
46 | struct rt6_info __rcu *rt6; | |
43b059a3 DA |
47 | #if IS_ENABLED(CONFIG_IPV6) |
48 | struct fib6_table *fib6_table; | |
49 | #endif | |
ec539514 DA |
50 | u32 tb_id; |
51 | }; | |
52 | ||
193125db DA |
53 | struct pcpu_dstats { |
54 | u64 tx_pkts; | |
55 | u64 tx_bytes; | |
56 | u64 tx_drps; | |
57 | u64 rx_pkts; | |
58 | u64 rx_bytes; | |
afe80a49 | 59 | u64 rx_drps; |
193125db DA |
60 | struct u64_stats_sync syncp; |
61 | }; | |
62 | ||
afe80a49 DA |
63 | static void vrf_rx_stats(struct net_device *dev, int len) |
64 | { | |
65 | struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats); | |
66 | ||
67 | u64_stats_update_begin(&dstats->syncp); | |
68 | dstats->rx_pkts++; | |
69 | dstats->rx_bytes += len; | |
70 | u64_stats_update_end(&dstats->syncp); | |
71 | } | |
72 | ||
57b8efa1 NA |
73 | static void vrf_tx_error(struct net_device *vrf_dev, struct sk_buff *skb) |
74 | { | |
75 | vrf_dev->stats.tx_errors++; | |
76 | kfree_skb(skb); | |
77 | } | |
78 | ||
bc1f4470 | 79 | static void vrf_get_stats64(struct net_device *dev, |
80 | struct rtnl_link_stats64 *stats) | |
193125db DA |
81 | { |
82 | int i; | |
83 | ||
84 | for_each_possible_cpu(i) { | |
85 | const struct pcpu_dstats *dstats; | |
86 | u64 tbytes, tpkts, tdrops, rbytes, rpkts; | |
87 | unsigned int start; | |
88 | ||
89 | dstats = per_cpu_ptr(dev->dstats, i); | |
90 | do { | |
91 | start = u64_stats_fetch_begin_irq(&dstats->syncp); | |
92 | tbytes = dstats->tx_bytes; | |
93 | tpkts = dstats->tx_pkts; | |
94 | tdrops = dstats->tx_drps; | |
95 | rbytes = dstats->rx_bytes; | |
96 | rpkts = dstats->rx_pkts; | |
97 | } while (u64_stats_fetch_retry_irq(&dstats->syncp, start)); | |
98 | stats->tx_bytes += tbytes; | |
99 | stats->tx_packets += tpkts; | |
100 | stats->tx_dropped += tdrops; | |
101 | stats->rx_bytes += rbytes; | |
102 | stats->rx_packets += rpkts; | |
103 | } | |
193125db DA |
104 | } |
105 | ||
dcdd43c4 DA |
106 | /* by default VRF devices do not have a qdisc and are expected |
107 | * to be created with only a single queue. | |
108 | */ | |
109 | static bool qdisc_tx_is_default(const struct net_device *dev) | |
110 | { | |
111 | struct netdev_queue *txq; | |
112 | struct Qdisc *qdisc; | |
113 | ||
114 | if (dev->num_tx_queues > 1) | |
115 | return false; | |
116 | ||
117 | txq = netdev_get_tx_queue(dev, 0); | |
118 | qdisc = rcu_access_pointer(txq->qdisc); | |
119 | ||
120 | return !qdisc->enqueue; | |
121 | } | |
122 | ||
afe80a49 DA |
123 | /* Local traffic destined to local address. Reinsert the packet to rx |
124 | * path, similar to loopback handling. | |
125 | */ | |
126 | static int vrf_local_xmit(struct sk_buff *skb, struct net_device *dev, | |
127 | struct dst_entry *dst) | |
128 | { | |
129 | int len = skb->len; | |
130 | ||
131 | skb_orphan(skb); | |
132 | ||
133 | skb_dst_set(skb, dst); | |
afe80a49 DA |
134 | |
135 | /* set pkt_type to avoid skb hitting packet taps twice - | |
136 | * once on Tx and again in Rx processing | |
137 | */ | |
138 | skb->pkt_type = PACKET_LOOPBACK; | |
139 | ||
140 | skb->protocol = eth_type_trans(skb, dev); | |
141 | ||
142 | if (likely(netif_rx(skb) == NET_RX_SUCCESS)) | |
143 | vrf_rx_stats(dev, len); | |
144 | else | |
145 | this_cpu_inc(dev->dstats->rx_drps); | |
146 | ||
147 | return NETDEV_TX_OK; | |
148 | } | |
149 | ||
35402e31 | 150 | #if IS_ENABLED(CONFIG_IPV6) |
4c1feac5 DA |
151 | static int vrf_ip6_local_out(struct net *net, struct sock *sk, |
152 | struct sk_buff *skb) | |
153 | { | |
154 | int err; | |
155 | ||
156 | err = nf_hook(NFPROTO_IPV6, NF_INET_LOCAL_OUT, net, | |
157 | sk, skb, NULL, skb_dst(skb)->dev, dst_output); | |
158 | ||
159 | if (likely(err == 1)) | |
160 | err = dst_output(net, sk, skb); | |
161 | ||
162 | return err; | |
163 | } | |
164 | ||
35402e31 DA |
165 | static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb, |
166 | struct net_device *dev) | |
167 | { | |
107e47cc | 168 | const struct ipv6hdr *iph; |
35402e31 | 169 | struct net *net = dev_net(skb->dev); |
107e47cc | 170 | struct flowi6 fl6; |
35402e31 DA |
171 | int ret = NET_XMIT_DROP; |
172 | struct dst_entry *dst; | |
173 | struct dst_entry *dst_null = &net->ipv6.ip6_null_entry->dst; | |
174 | ||
107e47cc PK |
175 | if (!pskb_may_pull(skb, ETH_HLEN + sizeof(struct ipv6hdr))) |
176 | goto err; | |
177 | ||
178 | iph = ipv6_hdr(skb); | |
179 | ||
180 | memset(&fl6, 0, sizeof(fl6)); | |
181 | /* needed to match OIF rule */ | |
182 | fl6.flowi6_oif = dev->ifindex; | |
183 | fl6.flowi6_iif = LOOPBACK_IFINDEX; | |
184 | fl6.daddr = iph->daddr; | |
185 | fl6.saddr = iph->saddr; | |
186 | fl6.flowlabel = ip6_flowinfo(iph); | |
187 | fl6.flowi6_mark = skb->mark; | |
188 | fl6.flowi6_proto = iph->nexthdr; | |
189 | fl6.flowi6_flags = FLOWI_FLAG_SKIP_NH_OIF; | |
190 | ||
a53c1028 DA |
191 | dst = ip6_dst_lookup_flow(net, NULL, &fl6, NULL); |
192 | if (IS_ERR(dst) || dst == dst_null) | |
35402e31 DA |
193 | goto err; |
194 | ||
195 | skb_dst_drop(skb); | |
b4869aa2 DA |
196 | |
197 | /* if dst.dev is loopback or the VRF device again this is locally | |
198 | * originated traffic destined to a local address. Short circuit | |
4f04256c | 199 | * to Rx path |
b4869aa2 | 200 | */ |
4f04256c DA |
201 | if (dst->dev == dev) |
202 | return vrf_local_xmit(skb, dev, dst); | |
b4869aa2 | 203 | |
35402e31 DA |
204 | skb_dst_set(skb, dst); |
205 | ||
911a66fb DA |
206 | /* strip the ethernet header added for pass through VRF device */ |
207 | __skb_pull(skb, skb_network_offset(skb)); | |
208 | ||
4c1feac5 | 209 | ret = vrf_ip6_local_out(net, skb->sk, skb); |
35402e31 DA |
210 | if (unlikely(net_xmit_eval(ret))) |
211 | dev->stats.tx_errors++; | |
212 | else | |
213 | ret = NET_XMIT_SUCCESS; | |
214 | ||
215 | return ret; | |
216 | err: | |
217 | vrf_tx_error(dev, skb); | |
218 | return NET_XMIT_DROP; | |
219 | } | |
220 | #else | |
193125db DA |
221 | static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb, |
222 | struct net_device *dev) | |
223 | { | |
57b8efa1 NA |
224 | vrf_tx_error(dev, skb); |
225 | return NET_XMIT_DROP; | |
193125db | 226 | } |
35402e31 | 227 | #endif |
193125db | 228 | |
ebfc102c DA |
229 | /* based on ip_local_out; can't use it b/c the dst is switched pointing to us */ |
230 | static int vrf_ip_local_out(struct net *net, struct sock *sk, | |
231 | struct sk_buff *skb) | |
232 | { | |
233 | int err; | |
234 | ||
235 | err = nf_hook(NFPROTO_IPV4, NF_INET_LOCAL_OUT, net, sk, | |
236 | skb, NULL, skb_dst(skb)->dev, dst_output); | |
237 | if (likely(err == 1)) | |
238 | err = dst_output(net, sk, skb); | |
239 | ||
240 | return err; | |
241 | } | |
242 | ||
193125db DA |
243 | static netdev_tx_t vrf_process_v4_outbound(struct sk_buff *skb, |
244 | struct net_device *vrf_dev) | |
245 | { | |
107e47cc | 246 | struct iphdr *ip4h; |
193125db | 247 | int ret = NET_XMIT_DROP; |
107e47cc | 248 | struct flowi4 fl4; |
911a66fb DA |
249 | struct net *net = dev_net(vrf_dev); |
250 | struct rtable *rt; | |
251 | ||
107e47cc PK |
252 | if (!pskb_may_pull(skb, ETH_HLEN + sizeof(struct iphdr))) |
253 | goto err; | |
254 | ||
255 | ip4h = ip_hdr(skb); | |
256 | ||
257 | memset(&fl4, 0, sizeof(fl4)); | |
258 | /* needed to match OIF rule */ | |
259 | fl4.flowi4_oif = vrf_dev->ifindex; | |
260 | fl4.flowi4_iif = LOOPBACK_IFINDEX; | |
261 | fl4.flowi4_tos = RT_TOS(ip4h->tos); | |
262 | fl4.flowi4_flags = FLOWI_FLAG_ANYSRC | FLOWI_FLAG_SKIP_NH_OIF; | |
263 | fl4.flowi4_proto = ip4h->protocol; | |
264 | fl4.daddr = ip4h->daddr; | |
265 | fl4.saddr = ip4h->saddr; | |
266 | ||
911a66fb DA |
267 | rt = ip_route_output_flow(net, &fl4, NULL); |
268 | if (IS_ERR(rt)) | |
269 | goto err; | |
193125db | 270 | |
911a66fb | 271 | skb_dst_drop(skb); |
afe80a49 DA |
272 | |
273 | /* if dst.dev is loopback or the VRF device again this is locally | |
274 | * originated traffic destined to a local address. Short circuit | |
4f04256c | 275 | * to Rx path |
afe80a49 | 276 | */ |
4f04256c DA |
277 | if (rt->dst.dev == vrf_dev) |
278 | return vrf_local_xmit(skb, vrf_dev, &rt->dst); | |
afe80a49 | 279 | |
911a66fb DA |
280 | skb_dst_set(skb, &rt->dst); |
281 | ||
282 | /* strip the ethernet header added for pass through VRF device */ | |
283 | __skb_pull(skb, skb_network_offset(skb)); | |
193125db DA |
284 | |
285 | if (!ip4h->saddr) { | |
286 | ip4h->saddr = inet_select_addr(skb_dst(skb)->dev, 0, | |
287 | RT_SCOPE_LINK); | |
288 | } | |
289 | ||
ebfc102c | 290 | ret = vrf_ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb); |
193125db DA |
291 | if (unlikely(net_xmit_eval(ret))) |
292 | vrf_dev->stats.tx_errors++; | |
293 | else | |
294 | ret = NET_XMIT_SUCCESS; | |
295 | ||
296 | out: | |
297 | return ret; | |
298 | err: | |
57b8efa1 | 299 | vrf_tx_error(vrf_dev, skb); |
193125db DA |
300 | goto out; |
301 | } | |
302 | ||
303 | static netdev_tx_t is_ip_tx_frame(struct sk_buff *skb, struct net_device *dev) | |
304 | { | |
305 | switch (skb->protocol) { | |
306 | case htons(ETH_P_IP): | |
307 | return vrf_process_v4_outbound(skb, dev); | |
308 | case htons(ETH_P_IPV6): | |
309 | return vrf_process_v6_outbound(skb, dev); | |
310 | default: | |
57b8efa1 | 311 | vrf_tx_error(dev, skb); |
193125db DA |
312 | return NET_XMIT_DROP; |
313 | } | |
314 | } | |
315 | ||
316 | static netdev_tx_t vrf_xmit(struct sk_buff *skb, struct net_device *dev) | |
317 | { | |
f7887d40 | 318 | int len = skb->len; |
193125db DA |
319 | netdev_tx_t ret = is_ip_tx_frame(skb, dev); |
320 | ||
321 | if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { | |
322 | struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats); | |
323 | ||
324 | u64_stats_update_begin(&dstats->syncp); | |
325 | dstats->tx_pkts++; | |
f7887d40 | 326 | dstats->tx_bytes += len; |
193125db DA |
327 | u64_stats_update_end(&dstats->syncp); |
328 | } else { | |
329 | this_cpu_inc(dev->dstats->tx_drps); | |
330 | } | |
331 | ||
332 | return ret; | |
333 | } | |
334 | ||
dcdd43c4 DA |
335 | static int vrf_finish_direct(struct net *net, struct sock *sk, |
336 | struct sk_buff *skb) | |
337 | { | |
338 | struct net_device *vrf_dev = skb->dev; | |
339 | ||
340 | if (!list_empty(&vrf_dev->ptype_all) && | |
341 | likely(skb_headroom(skb) >= ETH_HLEN)) { | |
d58ff351 | 342 | struct ethhdr *eth = skb_push(skb, ETH_HLEN); |
dcdd43c4 DA |
343 | |
344 | ether_addr_copy(eth->h_source, vrf_dev->dev_addr); | |
345 | eth_zero_addr(eth->h_dest); | |
346 | eth->h_proto = skb->protocol; | |
347 | ||
348 | rcu_read_lock_bh(); | |
349 | dev_queue_xmit_nit(skb, vrf_dev); | |
350 | rcu_read_unlock_bh(); | |
351 | ||
352 | skb_pull(skb, ETH_HLEN); | |
353 | } | |
354 | ||
355 | return 1; | |
356 | } | |
357 | ||
35402e31 | 358 | #if IS_ENABLED(CONFIG_IPV6) |
35402e31 DA |
359 | /* modelled after ip6_finish_output2 */ |
360 | static int vrf_finish_output6(struct net *net, struct sock *sk, | |
361 | struct sk_buff *skb) | |
362 | { | |
363 | struct dst_entry *dst = skb_dst(skb); | |
364 | struct net_device *dev = dst->dev; | |
9b1c1ef1 | 365 | const struct in6_addr *nexthop; |
35402e31 | 366 | struct neighbour *neigh; |
35402e31 DA |
367 | int ret; |
368 | ||
895b5c9f | 369 | nf_reset_ct(skb); |
eb63ecc1 | 370 | |
35402e31 DA |
371 | skb->protocol = htons(ETH_P_IPV6); |
372 | skb->dev = dev; | |
373 | ||
374 | rcu_read_lock_bh(); | |
375 | nexthop = rt6_nexthop((struct rt6_info *)dst, &ipv6_hdr(skb)->daddr); | |
376 | neigh = __ipv6_neigh_lookup_noref(dst->dev, nexthop); | |
377 | if (unlikely(!neigh)) | |
378 | neigh = __neigh_create(&nd_tbl, nexthop, dst->dev, false); | |
379 | if (!IS_ERR(neigh)) { | |
4ff06203 | 380 | sock_confirm_neigh(skb, neigh); |
0353f282 | 381 | ret = neigh_output(neigh, skb, false); |
35402e31 DA |
382 | rcu_read_unlock_bh(); |
383 | return ret; | |
384 | } | |
385 | rcu_read_unlock_bh(); | |
386 | ||
387 | IP6_INC_STATS(dev_net(dst->dev), | |
388 | ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES); | |
389 | kfree_skb(skb); | |
390 | return -EINVAL; | |
391 | } | |
392 | ||
393 | /* modelled after ip6_output */ | |
394 | static int vrf_output6(struct net *net, struct sock *sk, struct sk_buff *skb) | |
395 | { | |
396 | return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING, | |
397 | net, sk, skb, NULL, skb_dst(skb)->dev, | |
398 | vrf_finish_output6, | |
399 | !(IP6CB(skb)->flags & IP6SKB_REROUTED)); | |
400 | } | |
401 | ||
4c1feac5 DA |
402 | /* set dst on skb to send packet to us via dev_xmit path. Allows |
403 | * packet to go through device based features such as qdisc, netfilter | |
404 | * hooks and packet sockets with skb->dev set to vrf device. | |
405 | */ | |
a9ec54d1 DA |
406 | static struct sk_buff *vrf_ip6_out_redirect(struct net_device *vrf_dev, |
407 | struct sk_buff *skb) | |
4c1feac5 DA |
408 | { |
409 | struct net_vrf *vrf = netdev_priv(vrf_dev); | |
410 | struct dst_entry *dst = NULL; | |
411 | struct rt6_info *rt6; | |
412 | ||
4c1feac5 DA |
413 | rcu_read_lock(); |
414 | ||
415 | rt6 = rcu_dereference(vrf->rt6); | |
416 | if (likely(rt6)) { | |
417 | dst = &rt6->dst; | |
418 | dst_hold(dst); | |
419 | } | |
420 | ||
421 | rcu_read_unlock(); | |
422 | ||
423 | if (unlikely(!dst)) { | |
424 | vrf_tx_error(vrf_dev, skb); | |
425 | return NULL; | |
426 | } | |
427 | ||
428 | skb_dst_drop(skb); | |
429 | skb_dst_set(skb, dst); | |
430 | ||
431 | return skb; | |
432 | } | |
433 | ||
a9ec54d1 DA |
434 | static int vrf_output6_direct(struct net *net, struct sock *sk, |
435 | struct sk_buff *skb) | |
436 | { | |
437 | skb->protocol = htons(ETH_P_IPV6); | |
438 | ||
439 | return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING, | |
440 | net, sk, skb, NULL, skb->dev, | |
441 | vrf_finish_direct, | |
442 | !(IPCB(skb)->flags & IPSKB_REROUTED)); | |
443 | } | |
444 | ||
445 | static struct sk_buff *vrf_ip6_out_direct(struct net_device *vrf_dev, | |
446 | struct sock *sk, | |
447 | struct sk_buff *skb) | |
448 | { | |
449 | struct net *net = dev_net(vrf_dev); | |
450 | int err; | |
451 | ||
452 | skb->dev = vrf_dev; | |
453 | ||
454 | err = nf_hook(NFPROTO_IPV6, NF_INET_LOCAL_OUT, net, sk, | |
455 | skb, NULL, vrf_dev, vrf_output6_direct); | |
456 | ||
457 | if (likely(err == 1)) | |
458 | err = vrf_output6_direct(net, sk, skb); | |
459 | ||
460 | /* reset skb device */ | |
461 | if (likely(err == 1)) | |
895b5c9f | 462 | nf_reset_ct(skb); |
a9ec54d1 DA |
463 | else |
464 | skb = NULL; | |
465 | ||
466 | return skb; | |
467 | } | |
468 | ||
469 | static struct sk_buff *vrf_ip6_out(struct net_device *vrf_dev, | |
470 | struct sock *sk, | |
471 | struct sk_buff *skb) | |
472 | { | |
473 | /* don't divert link scope packets */ | |
474 | if (rt6_need_strict(&ipv6_hdr(skb)->daddr)) | |
475 | return skb; | |
476 | ||
16b9db1c DA |
477 | if (qdisc_tx_is_default(vrf_dev) || |
478 | IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED) | |
a9ec54d1 DA |
479 | return vrf_ip6_out_direct(vrf_dev, sk, skb); |
480 | ||
481 | return vrf_ip6_out_redirect(vrf_dev, skb); | |
482 | } | |
483 | ||
b0e95ccd | 484 | /* holding rtnl */ |
810e530b | 485 | static void vrf_rt6_release(struct net_device *dev, struct net_vrf *vrf) |
35402e31 | 486 | { |
b0e95ccd | 487 | struct rt6_info *rt6 = rtnl_dereference(vrf->rt6); |
810e530b DA |
488 | struct net *net = dev_net(dev); |
489 | struct dst_entry *dst; | |
b0e95ccd | 490 | |
b4869aa2 | 491 | RCU_INIT_POINTER(vrf->rt6, NULL); |
b4869aa2 | 492 | synchronize_rcu(); |
b0e95ccd | 493 | |
810e530b DA |
494 | /* move dev in dst's to loopback so this VRF device can be deleted |
495 | * - based on dst_ifdown | |
496 | */ | |
497 | if (rt6) { | |
498 | dst = &rt6->dst; | |
499 | dev_put(dst->dev); | |
500 | dst->dev = net->loopback_dev; | |
501 | dev_hold(dst->dev); | |
502 | dst_release(dst); | |
503 | } | |
35402e31 DA |
504 | } |
505 | ||
506 | static int vrf_rt6_create(struct net_device *dev) | |
507 | { | |
af13b3c3 | 508 | int flags = DST_NOPOLICY | DST_NOXFRM; |
35402e31 | 509 | struct net_vrf *vrf = netdev_priv(dev); |
9ab179d8 | 510 | struct net *net = dev_net(dev); |
4f04256c | 511 | struct rt6_info *rt6; |
35402e31 DA |
512 | int rc = -ENOMEM; |
513 | ||
e4348637 DA |
514 | /* IPv6 can be CONFIG enabled and then disabled runtime */ |
515 | if (!ipv6_mod_enabled()) | |
516 | return 0; | |
517 | ||
43b059a3 DA |
518 | vrf->fib6_table = fib6_new_table(net, vrf->tb_id); |
519 | if (!vrf->fib6_table) | |
b3b4663c DA |
520 | goto out; |
521 | ||
b4869aa2 DA |
522 | /* create a dst for routing packets out a VRF device */ |
523 | rt6 = ip6_dst_alloc(net, dev, flags); | |
35402e31 DA |
524 | if (!rt6) |
525 | goto out; | |
526 | ||
b3b4663c | 527 | rt6->dst.output = vrf_output6; |
b4869aa2 | 528 | |
b0e95ccd DA |
529 | rcu_assign_pointer(vrf->rt6, rt6); |
530 | ||
35402e31 DA |
531 | rc = 0; |
532 | out: | |
533 | return rc; | |
534 | } | |
535 | #else | |
4c1feac5 DA |
536 | static struct sk_buff *vrf_ip6_out(struct net_device *vrf_dev, |
537 | struct sock *sk, | |
538 | struct sk_buff *skb) | |
539 | { | |
540 | return skb; | |
541 | } | |
542 | ||
810e530b | 543 | static void vrf_rt6_release(struct net_device *dev, struct net_vrf *vrf) |
35402e31 DA |
544 | { |
545 | } | |
546 | ||
547 | static int vrf_rt6_create(struct net_device *dev) | |
548 | { | |
549 | return 0; | |
550 | } | |
551 | #endif | |
552 | ||
8f58336d | 553 | /* modelled after ip_finish_output2 */ |
0c4b51f0 | 554 | static int vrf_finish_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
193125db | 555 | { |
8f58336d DA |
556 | struct dst_entry *dst = skb_dst(skb); |
557 | struct rtable *rt = (struct rtable *)dst; | |
558 | struct net_device *dev = dst->dev; | |
559 | unsigned int hh_len = LL_RESERVED_SPACE(dev); | |
560 | struct neighbour *neigh; | |
5c9f7c1d | 561 | bool is_v6gw = false; |
8f58336d DA |
562 | int ret = -EINVAL; |
563 | ||
895b5c9f | 564 | nf_reset_ct(skb); |
eb63ecc1 | 565 | |
8f58336d DA |
566 | /* Be paranoid, rather than too clever. */ |
567 | if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) { | |
568 | struct sk_buff *skb2; | |
569 | ||
570 | skb2 = skb_realloc_headroom(skb, LL_RESERVED_SPACE(dev)); | |
571 | if (!skb2) { | |
572 | ret = -ENOMEM; | |
573 | goto err; | |
574 | } | |
575 | if (skb->sk) | |
576 | skb_set_owner_w(skb2, skb->sk); | |
577 | ||
578 | consume_skb(skb); | |
579 | skb = skb2; | |
580 | } | |
581 | ||
582 | rcu_read_lock_bh(); | |
583 | ||
5c9f7c1d | 584 | neigh = ip_neigh_for_gw(rt, skb, &is_v6gw); |
4ff06203 JA |
585 | if (!IS_ERR(neigh)) { |
586 | sock_confirm_neigh(skb, neigh); | |
5c9f7c1d DA |
587 | /* if crossing protocols, can not use the cached header */ |
588 | ret = neigh_output(neigh, skb, is_v6gw); | |
82dd0d2a DA |
589 | rcu_read_unlock_bh(); |
590 | return ret; | |
4ff06203 | 591 | } |
8f58336d DA |
592 | |
593 | rcu_read_unlock_bh(); | |
594 | err: | |
82dd0d2a | 595 | vrf_tx_error(skb->dev, skb); |
8f58336d | 596 | return ret; |
193125db DA |
597 | } |
598 | ||
ede2059d | 599 | static int vrf_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
193125db DA |
600 | { |
601 | struct net_device *dev = skb_dst(skb)->dev; | |
602 | ||
29a26a56 | 603 | IP_UPD_PO_STATS(net, IPSTATS_MIB_OUT, skb->len); |
193125db DA |
604 | |
605 | skb->dev = dev; | |
606 | skb->protocol = htons(ETH_P_IP); | |
607 | ||
29a26a56 EB |
608 | return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING, |
609 | net, sk, skb, NULL, dev, | |
8f58336d | 610 | vrf_finish_output, |
193125db DA |
611 | !(IPCB(skb)->flags & IPSKB_REROUTED)); |
612 | } | |
613 | ||
ebfc102c DA |
614 | /* set dst on skb to send packet to us via dev_xmit path. Allows |
615 | * packet to go through device based features such as qdisc, netfilter | |
616 | * hooks and packet sockets with skb->dev set to vrf device. | |
617 | */ | |
dcdd43c4 DA |
618 | static struct sk_buff *vrf_ip_out_redirect(struct net_device *vrf_dev, |
619 | struct sk_buff *skb) | |
ebfc102c DA |
620 | { |
621 | struct net_vrf *vrf = netdev_priv(vrf_dev); | |
622 | struct dst_entry *dst = NULL; | |
623 | struct rtable *rth; | |
624 | ||
625 | rcu_read_lock(); | |
626 | ||
627 | rth = rcu_dereference(vrf->rth); | |
628 | if (likely(rth)) { | |
629 | dst = &rth->dst; | |
630 | dst_hold(dst); | |
631 | } | |
632 | ||
633 | rcu_read_unlock(); | |
634 | ||
635 | if (unlikely(!dst)) { | |
636 | vrf_tx_error(vrf_dev, skb); | |
637 | return NULL; | |
638 | } | |
639 | ||
640 | skb_dst_drop(skb); | |
641 | skb_dst_set(skb, dst); | |
642 | ||
643 | return skb; | |
644 | } | |
645 | ||
dcdd43c4 DA |
646 | static int vrf_output_direct(struct net *net, struct sock *sk, |
647 | struct sk_buff *skb) | |
648 | { | |
649 | skb->protocol = htons(ETH_P_IP); | |
650 | ||
651 | return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING, | |
652 | net, sk, skb, NULL, skb->dev, | |
653 | vrf_finish_direct, | |
654 | !(IPCB(skb)->flags & IPSKB_REROUTED)); | |
655 | } | |
656 | ||
657 | static struct sk_buff *vrf_ip_out_direct(struct net_device *vrf_dev, | |
658 | struct sock *sk, | |
659 | struct sk_buff *skb) | |
660 | { | |
661 | struct net *net = dev_net(vrf_dev); | |
662 | int err; | |
663 | ||
664 | skb->dev = vrf_dev; | |
665 | ||
666 | err = nf_hook(NFPROTO_IPV4, NF_INET_LOCAL_OUT, net, sk, | |
667 | skb, NULL, vrf_dev, vrf_output_direct); | |
668 | ||
669 | if (likely(err == 1)) | |
670 | err = vrf_output_direct(net, sk, skb); | |
671 | ||
672 | /* reset skb device */ | |
673 | if (likely(err == 1)) | |
895b5c9f | 674 | nf_reset_ct(skb); |
dcdd43c4 DA |
675 | else |
676 | skb = NULL; | |
677 | ||
678 | return skb; | |
679 | } | |
680 | ||
681 | static struct sk_buff *vrf_ip_out(struct net_device *vrf_dev, | |
682 | struct sock *sk, | |
683 | struct sk_buff *skb) | |
684 | { | |
1e19c4d6 DA |
685 | /* don't divert multicast or local broadcast */ |
686 | if (ipv4_is_multicast(ip_hdr(skb)->daddr) || | |
687 | ipv4_is_lbcast(ip_hdr(skb)->daddr)) | |
dcdd43c4 DA |
688 | return skb; |
689 | ||
16b9db1c DA |
690 | if (qdisc_tx_is_default(vrf_dev) || |
691 | IPCB(skb)->flags & IPSKB_XFRM_TRANSFORMED) | |
dcdd43c4 DA |
692 | return vrf_ip_out_direct(vrf_dev, sk, skb); |
693 | ||
694 | return vrf_ip_out_redirect(vrf_dev, skb); | |
695 | } | |
696 | ||
ebfc102c DA |
697 | /* called with rcu lock held */ |
698 | static struct sk_buff *vrf_l3_out(struct net_device *vrf_dev, | |
699 | struct sock *sk, | |
700 | struct sk_buff *skb, | |
701 | u16 proto) | |
702 | { | |
703 | switch (proto) { | |
704 | case AF_INET: | |
705 | return vrf_ip_out(vrf_dev, sk, skb); | |
4c1feac5 DA |
706 | case AF_INET6: |
707 | return vrf_ip6_out(vrf_dev, sk, skb); | |
ebfc102c DA |
708 | } |
709 | ||
710 | return skb; | |
711 | } | |
712 | ||
b0e95ccd | 713 | /* holding rtnl */ |
810e530b | 714 | static void vrf_rtable_release(struct net_device *dev, struct net_vrf *vrf) |
193125db | 715 | { |
b0e95ccd | 716 | struct rtable *rth = rtnl_dereference(vrf->rth); |
810e530b DA |
717 | struct net *net = dev_net(dev); |
718 | struct dst_entry *dst; | |
b0e95ccd | 719 | |
afe80a49 | 720 | RCU_INIT_POINTER(vrf->rth, NULL); |
afe80a49 | 721 | synchronize_rcu(); |
193125db | 722 | |
810e530b DA |
723 | /* move dev in dst's to loopback so this VRF device can be deleted |
724 | * - based on dst_ifdown | |
725 | */ | |
726 | if (rth) { | |
727 | dst = &rth->dst; | |
728 | dev_put(dst->dev); | |
729 | dst->dev = net->loopback_dev; | |
730 | dev_hold(dst->dev); | |
731 | dst_release(dst); | |
732 | } | |
193125db DA |
733 | } |
734 | ||
b0e95ccd | 735 | static int vrf_rtable_create(struct net_device *dev) |
193125db | 736 | { |
b7503e0c | 737 | struct net_vrf *vrf = netdev_priv(dev); |
4f04256c | 738 | struct rtable *rth; |
193125db | 739 | |
b3b4663c | 740 | if (!fib_new_table(dev_net(dev), vrf->tb_id)) |
b0e95ccd | 741 | return -ENOMEM; |
b3b4663c | 742 | |
afe80a49 | 743 | /* create a dst for routing packets out through a VRF device */ |
af13b3c3 | 744 | rth = rt_dst_alloc(dev, 0, RTN_UNICAST, 1, 1); |
b0e95ccd DA |
745 | if (!rth) |
746 | return -ENOMEM; | |
193125db | 747 | |
b0e95ccd | 748 | rth->dst.output = vrf_output; |
b0e95ccd DA |
749 | |
750 | rcu_assign_pointer(vrf->rth, rth); | |
751 | ||
752 | return 0; | |
193125db DA |
753 | } |
754 | ||
755 | /**************************** device handling ********************/ | |
756 | ||
757 | /* cycle interface to flush neighbor cache and move routes across tables */ | |
dc1aea1e PM |
758 | static void cycle_netdev(struct net_device *dev, |
759 | struct netlink_ext_ack *extack) | |
193125db DA |
760 | { |
761 | unsigned int flags = dev->flags; | |
762 | int ret; | |
763 | ||
764 | if (!netif_running(dev)) | |
765 | return; | |
766 | ||
567c5e13 | 767 | ret = dev_change_flags(dev, flags & ~IFF_UP, extack); |
193125db | 768 | if (ret >= 0) |
567c5e13 | 769 | ret = dev_change_flags(dev, flags, extack); |
193125db DA |
770 | |
771 | if (ret < 0) { | |
772 | netdev_err(dev, | |
773 | "Failed to cycle device %s; route tables might be wrong!\n", | |
774 | dev->name); | |
775 | } | |
776 | } | |
777 | ||
42ab19ee DA |
778 | static int do_vrf_add_slave(struct net_device *dev, struct net_device *port_dev, |
779 | struct netlink_ext_ack *extack) | |
193125db | 780 | { |
bad53162 | 781 | int ret; |
193125db | 782 | |
26d31ac1 DA |
783 | /* do not allow loopback device to be enslaved to a VRF. |
784 | * The vrf device acts as the loopback for the vrf. | |
785 | */ | |
de3baa3e DA |
786 | if (port_dev == dev_net(dev)->loopback_dev) { |
787 | NL_SET_ERR_MSG(extack, | |
788 | "Can not enslave loopback device to a VRF"); | |
26d31ac1 | 789 | return -EOPNOTSUPP; |
de3baa3e | 790 | } |
26d31ac1 | 791 | |
fdeea7be | 792 | port_dev->priv_flags |= IFF_L3MDEV_SLAVE; |
42ab19ee | 793 | ret = netdev_master_upper_dev_link(port_dev, dev, NULL, NULL, extack); |
193125db | 794 | if (ret < 0) |
fdeea7be | 795 | goto err; |
193125db | 796 | |
dc1aea1e | 797 | cycle_netdev(port_dev, extack); |
193125db DA |
798 | |
799 | return 0; | |
fdeea7be IS |
800 | |
801 | err: | |
802 | port_dev->priv_flags &= ~IFF_L3MDEV_SLAVE; | |
803 | return ret; | |
193125db DA |
804 | } |
805 | ||
33eaf2a6 DA |
806 | static int vrf_add_slave(struct net_device *dev, struct net_device *port_dev, |
807 | struct netlink_ext_ack *extack) | |
193125db | 808 | { |
de3baa3e DA |
809 | if (netif_is_l3_master(port_dev)) { |
810 | NL_SET_ERR_MSG(extack, | |
811 | "Can not enslave an L3 master device to a VRF"); | |
812 | return -EINVAL; | |
813 | } | |
814 | ||
815 | if (netif_is_l3_slave(port_dev)) | |
193125db DA |
816 | return -EINVAL; |
817 | ||
42ab19ee | 818 | return do_vrf_add_slave(dev, port_dev, extack); |
193125db DA |
819 | } |
820 | ||
821 | /* inverse of do_vrf_add_slave */ | |
822 | static int do_vrf_del_slave(struct net_device *dev, struct net_device *port_dev) | |
823 | { | |
193125db | 824 | netdev_upper_dev_unlink(port_dev, dev); |
fee6d4c7 | 825 | port_dev->priv_flags &= ~IFF_L3MDEV_SLAVE; |
193125db | 826 | |
dc1aea1e | 827 | cycle_netdev(port_dev, NULL); |
193125db | 828 | |
193125db DA |
829 | return 0; |
830 | } | |
831 | ||
832 | static int vrf_del_slave(struct net_device *dev, struct net_device *port_dev) | |
833 | { | |
193125db DA |
834 | return do_vrf_del_slave(dev, port_dev); |
835 | } | |
836 | ||
837 | static void vrf_dev_uninit(struct net_device *dev) | |
838 | { | |
839 | struct net_vrf *vrf = netdev_priv(dev); | |
193125db | 840 | |
810e530b DA |
841 | vrf_rtable_release(dev, vrf); |
842 | vrf_rt6_release(dev, vrf); | |
193125db | 843 | |
3a4a27d3 | 844 | free_percpu(dev->dstats); |
193125db DA |
845 | dev->dstats = NULL; |
846 | } | |
847 | ||
848 | static int vrf_dev_init(struct net_device *dev) | |
849 | { | |
850 | struct net_vrf *vrf = netdev_priv(dev); | |
851 | ||
193125db DA |
852 | dev->dstats = netdev_alloc_pcpu_stats(struct pcpu_dstats); |
853 | if (!dev->dstats) | |
854 | goto out_nomem; | |
855 | ||
856 | /* create the default dst which points back to us */ | |
b0e95ccd | 857 | if (vrf_rtable_create(dev) != 0) |
193125db DA |
858 | goto out_stats; |
859 | ||
35402e31 DA |
860 | if (vrf_rt6_create(dev) != 0) |
861 | goto out_rth; | |
862 | ||
193125db DA |
863 | dev->flags = IFF_MASTER | IFF_NOARP; |
864 | ||
b87ab6b8 DA |
865 | /* MTU is irrelevant for VRF device; set to 64k similar to lo */ |
866 | dev->mtu = 64 * 1024; | |
867 | ||
868 | /* similarly, oper state is irrelevant; set to up to avoid confusion */ | |
869 | dev->operstate = IF_OPER_UP; | |
1a33e10e | 870 | netdev_lockdep_set_classes(dev); |
193125db DA |
871 | return 0; |
872 | ||
35402e31 | 873 | out_rth: |
810e530b | 874 | vrf_rtable_release(dev, vrf); |
193125db DA |
875 | out_stats: |
876 | free_percpu(dev->dstats); | |
877 | dev->dstats = NULL; | |
878 | out_nomem: | |
879 | return -ENOMEM; | |
880 | } | |
881 | ||
882 | static const struct net_device_ops vrf_netdev_ops = { | |
883 | .ndo_init = vrf_dev_init, | |
884 | .ndo_uninit = vrf_dev_uninit, | |
885 | .ndo_start_xmit = vrf_xmit, | |
6819e3f6 | 886 | .ndo_set_mac_address = eth_mac_addr, |
193125db DA |
887 | .ndo_get_stats64 = vrf_get_stats64, |
888 | .ndo_add_slave = vrf_add_slave, | |
889 | .ndo_del_slave = vrf_del_slave, | |
890 | }; | |
891 | ||
ee15ee5d DA |
892 | static u32 vrf_fib_table(const struct net_device *dev) |
893 | { | |
894 | struct net_vrf *vrf = netdev_priv(dev); | |
895 | ||
896 | return vrf->tb_id; | |
897 | } | |
898 | ||
73e20b76 DA |
899 | static int vrf_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb) |
900 | { | |
1a4a5bf5 | 901 | kfree_skb(skb); |
73e20b76 DA |
902 | return 0; |
903 | } | |
904 | ||
905 | static struct sk_buff *vrf_rcv_nfhook(u8 pf, unsigned int hook, | |
906 | struct sk_buff *skb, | |
907 | struct net_device *dev) | |
908 | { | |
909 | struct net *net = dev_net(dev); | |
910 | ||
1a4a5bf5 | 911 | if (nf_hook(pf, hook, net, NULL, skb, dev, NULL, vrf_rcv_finish) != 1) |
73e20b76 DA |
912 | skb = NULL; /* kfree_skb(skb) handled by nf code */ |
913 | ||
914 | return skb; | |
915 | } | |
916 | ||
74b20582 DA |
917 | #if IS_ENABLED(CONFIG_IPV6) |
918 | /* neighbor handling is done with actual device; do not want | |
919 | * to flip skb->dev for those ndisc packets. This really fails | |
920 | * for multiple next protocols (e.g., NEXTHDR_HOP). But it is | |
921 | * a start. | |
922 | */ | |
923 | static bool ipv6_ndisc_frame(const struct sk_buff *skb) | |
924 | { | |
925 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
926 | bool rc = false; | |
927 | ||
928 | if (iph->nexthdr == NEXTHDR_ICMP) { | |
929 | const struct icmp6hdr *icmph; | |
930 | struct icmp6hdr _icmph; | |
931 | ||
932 | icmph = skb_header_pointer(skb, sizeof(*iph), | |
933 | sizeof(_icmph), &_icmph); | |
934 | if (!icmph) | |
935 | goto out; | |
936 | ||
937 | switch (icmph->icmp6_type) { | |
938 | case NDISC_ROUTER_SOLICITATION: | |
939 | case NDISC_ROUTER_ADVERTISEMENT: | |
940 | case NDISC_NEIGHBOUR_SOLICITATION: | |
941 | case NDISC_NEIGHBOUR_ADVERTISEMENT: | |
942 | case NDISC_REDIRECT: | |
943 | rc = true; | |
944 | break; | |
945 | } | |
946 | } | |
947 | ||
948 | out: | |
949 | return rc; | |
950 | } | |
951 | ||
9ff74384 DA |
952 | static struct rt6_info *vrf_ip6_route_lookup(struct net *net, |
953 | const struct net_device *dev, | |
954 | struct flowi6 *fl6, | |
955 | int ifindex, | |
b75cc8f9 | 956 | const struct sk_buff *skb, |
9ff74384 DA |
957 | int flags) |
958 | { | |
959 | struct net_vrf *vrf = netdev_priv(dev); | |
9ff74384 | 960 | |
43b059a3 | 961 | return ip6_pol_route(net, vrf->fib6_table, ifindex, fl6, skb, flags); |
9ff74384 DA |
962 | } |
963 | ||
964 | static void vrf_ip6_input_dst(struct sk_buff *skb, struct net_device *vrf_dev, | |
965 | int ifindex) | |
966 | { | |
967 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
968 | struct flowi6 fl6 = { | |
ecf09117 AB |
969 | .flowi6_iif = ifindex, |
970 | .flowi6_mark = skb->mark, | |
971 | .flowi6_proto = iph->nexthdr, | |
9ff74384 DA |
972 | .daddr = iph->daddr, |
973 | .saddr = iph->saddr, | |
974 | .flowlabel = ip6_flowinfo(iph), | |
9ff74384 DA |
975 | }; |
976 | struct net *net = dev_net(vrf_dev); | |
977 | struct rt6_info *rt6; | |
978 | ||
b75cc8f9 | 979 | rt6 = vrf_ip6_route_lookup(net, vrf_dev, &fl6, ifindex, skb, |
9ff74384 DA |
980 | RT6_LOOKUP_F_HAS_SADDR | RT6_LOOKUP_F_IFACE); |
981 | if (unlikely(!rt6)) | |
982 | return; | |
983 | ||
984 | if (unlikely(&rt6->dst == &net->ipv6.ip6_null_entry->dst)) | |
985 | return; | |
986 | ||
987 | skb_dst_set(skb, &rt6->dst); | |
988 | } | |
989 | ||
74b20582 DA |
990 | static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev, |
991 | struct sk_buff *skb) | |
992 | { | |
9ff74384 | 993 | int orig_iif = skb->skb_iif; |
6f12fa77 MM |
994 | bool need_strict = rt6_need_strict(&ipv6_hdr(skb)->daddr); |
995 | bool is_ndisc = ipv6_ndisc_frame(skb); | |
9ff74384 | 996 | |
6f12fa77 MM |
997 | /* loopback, multicast & non-ND link-local traffic; do not push through |
998 | * packet taps again. Reset pkt_type for upper layers to process skb | |
b4869aa2 | 999 | */ |
6f12fa77 | 1000 | if (skb->pkt_type == PACKET_LOOPBACK || (need_strict && !is_ndisc)) { |
b4869aa2 DA |
1001 | skb->dev = vrf_dev; |
1002 | skb->skb_iif = vrf_dev->ifindex; | |
a04a480d | 1003 | IP6CB(skb)->flags |= IP6SKB_L3SLAVE; |
6f12fa77 MM |
1004 | if (skb->pkt_type == PACKET_LOOPBACK) |
1005 | skb->pkt_type = PACKET_HOST; | |
b4869aa2 DA |
1006 | goto out; |
1007 | } | |
1008 | ||
6f12fa77 MM |
1009 | /* if packet is NDISC then keep the ingress interface */ |
1010 | if (!is_ndisc) { | |
926d93a3 | 1011 | vrf_rx_stats(vrf_dev, skb->len); |
74b20582 DA |
1012 | skb->dev = vrf_dev; |
1013 | skb->skb_iif = vrf_dev->ifindex; | |
1014 | ||
a9ec54d1 DA |
1015 | if (!list_empty(&vrf_dev->ptype_all)) { |
1016 | skb_push(skb, skb->mac_len); | |
1017 | dev_queue_xmit_nit(skb, vrf_dev); | |
1018 | skb_pull(skb, skb->mac_len); | |
1019 | } | |
74b20582 DA |
1020 | |
1021 | IP6CB(skb)->flags |= IP6SKB_L3SLAVE; | |
1022 | } | |
1023 | ||
9ff74384 DA |
1024 | if (need_strict) |
1025 | vrf_ip6_input_dst(skb, vrf_dev, orig_iif); | |
1026 | ||
73e20b76 | 1027 | skb = vrf_rcv_nfhook(NFPROTO_IPV6, NF_INET_PRE_ROUTING, skb, vrf_dev); |
b4869aa2 | 1028 | out: |
74b20582 DA |
1029 | return skb; |
1030 | } | |
1031 | ||
1032 | #else | |
1033 | static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev, | |
1034 | struct sk_buff *skb) | |
1035 | { | |
1036 | return skb; | |
1037 | } | |
1038 | #endif | |
1039 | ||
1040 | static struct sk_buff *vrf_ip_rcv(struct net_device *vrf_dev, | |
1041 | struct sk_buff *skb) | |
1042 | { | |
1043 | skb->dev = vrf_dev; | |
1044 | skb->skb_iif = vrf_dev->ifindex; | |
a04a480d | 1045 | IPCB(skb)->flags |= IPSKB_L3SLAVE; |
74b20582 | 1046 | |
e58e4159 DA |
1047 | if (ipv4_is_multicast(ip_hdr(skb)->daddr)) |
1048 | goto out; | |
1049 | ||
afe80a49 DA |
1050 | /* loopback traffic; do not push through packet taps again. |
1051 | * Reset pkt_type for upper layers to process skb | |
1052 | */ | |
1053 | if (skb->pkt_type == PACKET_LOOPBACK) { | |
1054 | skb->pkt_type = PACKET_HOST; | |
1055 | goto out; | |
1056 | } | |
1057 | ||
926d93a3 DA |
1058 | vrf_rx_stats(vrf_dev, skb->len); |
1059 | ||
dcdd43c4 DA |
1060 | if (!list_empty(&vrf_dev->ptype_all)) { |
1061 | skb_push(skb, skb->mac_len); | |
1062 | dev_queue_xmit_nit(skb, vrf_dev); | |
1063 | skb_pull(skb, skb->mac_len); | |
1064 | } | |
74b20582 | 1065 | |
73e20b76 | 1066 | skb = vrf_rcv_nfhook(NFPROTO_IPV4, NF_INET_PRE_ROUTING, skb, vrf_dev); |
afe80a49 | 1067 | out: |
74b20582 DA |
1068 | return skb; |
1069 | } | |
1070 | ||
1071 | /* called with rcu lock held */ | |
1072 | static struct sk_buff *vrf_l3_rcv(struct net_device *vrf_dev, | |
1073 | struct sk_buff *skb, | |
1074 | u16 proto) | |
1075 | { | |
1076 | switch (proto) { | |
1077 | case AF_INET: | |
1078 | return vrf_ip_rcv(vrf_dev, skb); | |
1079 | case AF_INET6: | |
1080 | return vrf_ip6_rcv(vrf_dev, skb); | |
1081 | } | |
1082 | ||
1083 | return skb; | |
1084 | } | |
1085 | ||
35402e31 | 1086 | #if IS_ENABLED(CONFIG_IPV6) |
4c1feac5 DA |
1087 | /* send to link-local or multicast address via interface enslaved to |
1088 | * VRF device. Force lookup to VRF table without changing flow struct | |
7d9e5f42 WW |
1089 | * Note: Caller to this function must hold rcu_read_lock() and no refcnt |
1090 | * is taken on the dst by this function. | |
4c1feac5 DA |
1091 | */ |
1092 | static struct dst_entry *vrf_link_scope_lookup(const struct net_device *dev, | |
1093 | struct flowi6 *fl6) | |
35402e31 | 1094 | { |
9ff74384 | 1095 | struct net *net = dev_net(dev); |
7d9e5f42 | 1096 | int flags = RT6_LOOKUP_F_IFACE | RT6_LOOKUP_F_DST_NOREF; |
b0e95ccd | 1097 | struct dst_entry *dst = NULL; |
9ff74384 | 1098 | struct rt6_info *rt; |
35402e31 | 1099 | |
4c1feac5 DA |
1100 | /* VRF device does not have a link-local address and |
1101 | * sending packets to link-local or mcast addresses over | |
1102 | * a VRF device does not make sense | |
1103 | */ | |
1104 | if (fl6->flowi6_oif == dev->ifindex) { | |
1105 | dst = &net->ipv6.ip6_null_entry->dst; | |
4c1feac5 | 1106 | return dst; |
35402e31 DA |
1107 | } |
1108 | ||
4c1feac5 DA |
1109 | if (!ipv6_addr_any(&fl6->saddr)) |
1110 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
1111 | ||
b75cc8f9 | 1112 | rt = vrf_ip6_route_lookup(net, dev, fl6, fl6->flowi6_oif, NULL, flags); |
4c1feac5 DA |
1113 | if (rt) |
1114 | dst = &rt->dst; | |
9ff74384 | 1115 | |
b0e95ccd | 1116 | return dst; |
35402e31 DA |
1117 | } |
1118 | #endif | |
1119 | ||
ee15ee5d DA |
1120 | static const struct l3mdev_ops vrf_l3mdev_ops = { |
1121 | .l3mdev_fib_table = vrf_fib_table, | |
74b20582 | 1122 | .l3mdev_l3_rcv = vrf_l3_rcv, |
ebfc102c | 1123 | .l3mdev_l3_out = vrf_l3_out, |
35402e31 | 1124 | #if IS_ENABLED(CONFIG_IPV6) |
4c1feac5 | 1125 | .l3mdev_link_scope_lookup = vrf_link_scope_lookup, |
35402e31 | 1126 | #endif |
ee15ee5d DA |
1127 | }; |
1128 | ||
193125db DA |
1129 | static void vrf_get_drvinfo(struct net_device *dev, |
1130 | struct ethtool_drvinfo *info) | |
1131 | { | |
1132 | strlcpy(info->driver, DRV_NAME, sizeof(info->driver)); | |
1133 | strlcpy(info->version, DRV_VERSION, sizeof(info->version)); | |
1134 | } | |
1135 | ||
1136 | static const struct ethtool_ops vrf_ethtool_ops = { | |
1137 | .get_drvinfo = vrf_get_drvinfo, | |
1138 | }; | |
1139 | ||
1aa6c4f6 DA |
1140 | static inline size_t vrf_fib_rule_nl_size(void) |
1141 | { | |
1142 | size_t sz; | |
1143 | ||
1144 | sz = NLMSG_ALIGN(sizeof(struct fib_rule_hdr)); | |
1145 | sz += nla_total_size(sizeof(u8)); /* FRA_L3MDEV */ | |
1146 | sz += nla_total_size(sizeof(u32)); /* FRA_PRIORITY */ | |
1b71af60 | 1147 | sz += nla_total_size(sizeof(u8)); /* FRA_PROTOCOL */ |
1aa6c4f6 DA |
1148 | |
1149 | return sz; | |
1150 | } | |
1151 | ||
1152 | static int vrf_fib_rule(const struct net_device *dev, __u8 family, bool add_it) | |
1153 | { | |
1154 | struct fib_rule_hdr *frh; | |
1155 | struct nlmsghdr *nlh; | |
1156 | struct sk_buff *skb; | |
1157 | int err; | |
1158 | ||
dac91170 DA |
1159 | if ((family == AF_INET6 || family == RTNL_FAMILY_IP6MR) && |
1160 | !ipv6_mod_enabled()) | |
e4348637 DA |
1161 | return 0; |
1162 | ||
1aa6c4f6 DA |
1163 | skb = nlmsg_new(vrf_fib_rule_nl_size(), GFP_KERNEL); |
1164 | if (!skb) | |
1165 | return -ENOMEM; | |
1166 | ||
1167 | nlh = nlmsg_put(skb, 0, 0, 0, sizeof(*frh), 0); | |
1168 | if (!nlh) | |
1169 | goto nla_put_failure; | |
1170 | ||
1171 | /* rule only needs to appear once */ | |
426c87ca | 1172 | nlh->nlmsg_flags |= NLM_F_EXCL; |
1aa6c4f6 DA |
1173 | |
1174 | frh = nlmsg_data(nlh); | |
1175 | memset(frh, 0, sizeof(*frh)); | |
1176 | frh->family = family; | |
1177 | frh->action = FR_ACT_TO_TBL; | |
1b71af60 DS |
1178 | |
1179 | if (nla_put_u8(skb, FRA_PROTOCOL, RTPROT_KERNEL)) | |
1180 | goto nla_put_failure; | |
1aa6c4f6 | 1181 | |
18129a24 | 1182 | if (nla_put_u8(skb, FRA_L3MDEV, 1)) |
1aa6c4f6 DA |
1183 | goto nla_put_failure; |
1184 | ||
1185 | if (nla_put_u32(skb, FRA_PRIORITY, FIB_RULE_PREF)) | |
1186 | goto nla_put_failure; | |
1187 | ||
1188 | nlmsg_end(skb, nlh); | |
1189 | ||
1190 | /* fib_nl_{new,del}rule handling looks for net from skb->sk */ | |
1191 | skb->sk = dev_net(dev)->rtnl; | |
1192 | if (add_it) { | |
c21ef3e3 | 1193 | err = fib_nl_newrule(skb, nlh, NULL); |
1aa6c4f6 DA |
1194 | if (err == -EEXIST) |
1195 | err = 0; | |
1196 | } else { | |
c21ef3e3 | 1197 | err = fib_nl_delrule(skb, nlh, NULL); |
1aa6c4f6 DA |
1198 | if (err == -ENOENT) |
1199 | err = 0; | |
1200 | } | |
1201 | nlmsg_free(skb); | |
1202 | ||
1203 | return err; | |
1204 | ||
1205 | nla_put_failure: | |
1206 | nlmsg_free(skb); | |
1207 | ||
1208 | return -EMSGSIZE; | |
1209 | } | |
1210 | ||
1211 | static int vrf_add_fib_rules(const struct net_device *dev) | |
1212 | { | |
1213 | int err; | |
1214 | ||
1215 | err = vrf_fib_rule(dev, AF_INET, true); | |
1216 | if (err < 0) | |
1217 | goto out_err; | |
1218 | ||
1219 | err = vrf_fib_rule(dev, AF_INET6, true); | |
1220 | if (err < 0) | |
1221 | goto ipv6_err; | |
1222 | ||
e58e4159 DA |
1223 | #if IS_ENABLED(CONFIG_IP_MROUTE_MULTIPLE_TABLES) |
1224 | err = vrf_fib_rule(dev, RTNL_FAMILY_IPMR, true); | |
1225 | if (err < 0) | |
1226 | goto ipmr_err; | |
1227 | #endif | |
1228 | ||
e4a38c0c PR |
1229 | #if IS_ENABLED(CONFIG_IPV6_MROUTE_MULTIPLE_TABLES) |
1230 | err = vrf_fib_rule(dev, RTNL_FAMILY_IP6MR, true); | |
1231 | if (err < 0) | |
1232 | goto ip6mr_err; | |
1233 | #endif | |
1234 | ||
1aa6c4f6 DA |
1235 | return 0; |
1236 | ||
e4a38c0c PR |
1237 | #if IS_ENABLED(CONFIG_IPV6_MROUTE_MULTIPLE_TABLES) |
1238 | ip6mr_err: | |
1239 | vrf_fib_rule(dev, RTNL_FAMILY_IPMR, false); | |
1240 | #endif | |
1241 | ||
e58e4159 DA |
1242 | #if IS_ENABLED(CONFIG_IP_MROUTE_MULTIPLE_TABLES) |
1243 | ipmr_err: | |
1244 | vrf_fib_rule(dev, AF_INET6, false); | |
1245 | #endif | |
1246 | ||
1aa6c4f6 DA |
1247 | ipv6_err: |
1248 | vrf_fib_rule(dev, AF_INET, false); | |
1249 | ||
1250 | out_err: | |
1251 | netdev_err(dev, "Failed to add FIB rules.\n"); | |
1252 | return err; | |
1253 | } | |
1254 | ||
193125db DA |
1255 | static void vrf_setup(struct net_device *dev) |
1256 | { | |
1257 | ether_setup(dev); | |
1258 | ||
1259 | /* Initialize the device structure. */ | |
1260 | dev->netdev_ops = &vrf_netdev_ops; | |
ee15ee5d | 1261 | dev->l3mdev_ops = &vrf_l3mdev_ops; |
193125db | 1262 | dev->ethtool_ops = &vrf_ethtool_ops; |
cf124db5 | 1263 | dev->needs_free_netdev = true; |
193125db DA |
1264 | |
1265 | /* Fill in device structure with ethernet-generic values. */ | |
1266 | eth_hw_addr_random(dev); | |
1267 | ||
1268 | /* don't acquire vrf device's netif_tx_lock when transmitting */ | |
1269 | dev->features |= NETIF_F_LLTX; | |
1270 | ||
1271 | /* don't allow vrf devices to change network namespaces. */ | |
1272 | dev->features |= NETIF_F_NETNS_LOCAL; | |
7889681f DA |
1273 | |
1274 | /* does not make sense for a VLAN to be added to a vrf device */ | |
1275 | dev->features |= NETIF_F_VLAN_CHALLENGED; | |
1276 | ||
1277 | /* enable offload features */ | |
1278 | dev->features |= NETIF_F_GSO_SOFTWARE; | |
cb160394 | 1279 | dev->features |= NETIF_F_RXCSUM | NETIF_F_HW_CSUM | NETIF_F_SCTP_CRC; |
7889681f DA |
1280 | dev->features |= NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA; |
1281 | ||
1282 | dev->hw_features = dev->features; | |
1283 | dev->hw_enc_features = dev->features; | |
1284 | ||
1285 | /* default to no qdisc; user can add if desired */ | |
1286 | dev->priv_flags |= IFF_NO_QUEUE; | |
1017e098 | 1287 | dev->priv_flags |= IFF_NO_RX_HANDLER; |
6819e3f6 | 1288 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
ad49bc63 | 1289 | |
5055376a ML |
1290 | /* VRF devices do not care about MTU, but if the MTU is set |
1291 | * too low then the ipv4 and ipv6 protocols are disabled | |
1292 | * which breaks networking. | |
1293 | */ | |
1294 | dev->min_mtu = IPV6_MIN_MTU; | |
1295 | dev->max_mtu = ETH_MAX_MTU; | |
193125db DA |
1296 | } |
1297 | ||
a8b8a889 MS |
1298 | static int vrf_validate(struct nlattr *tb[], struct nlattr *data[], |
1299 | struct netlink_ext_ack *extack) | |
193125db DA |
1300 | { |
1301 | if (tb[IFLA_ADDRESS]) { | |
53b94835 DA |
1302 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) { |
1303 | NL_SET_ERR_MSG(extack, "Invalid hardware address"); | |
193125db | 1304 | return -EINVAL; |
53b94835 DA |
1305 | } |
1306 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) { | |
1307 | NL_SET_ERR_MSG(extack, "Invalid hardware address"); | |
193125db | 1308 | return -EADDRNOTAVAIL; |
53b94835 | 1309 | } |
193125db DA |
1310 | } |
1311 | return 0; | |
1312 | } | |
1313 | ||
1314 | static void vrf_dellink(struct net_device *dev, struct list_head *head) | |
1315 | { | |
f630c38e NA |
1316 | struct net_device *port_dev; |
1317 | struct list_head *iter; | |
1318 | ||
1319 | netdev_for_each_lower_dev(dev, port_dev, iter) | |
1320 | vrf_del_slave(dev, port_dev); | |
1321 | ||
193125db DA |
1322 | unregister_netdevice_queue(dev, head); |
1323 | } | |
1324 | ||
1325 | static int vrf_newlink(struct net *src_net, struct net_device *dev, | |
7a3f4a18 MS |
1326 | struct nlattr *tb[], struct nlattr *data[], |
1327 | struct netlink_ext_ack *extack) | |
193125db DA |
1328 | { |
1329 | struct net_vrf *vrf = netdev_priv(dev); | |
097d3c95 DA |
1330 | bool *add_fib_rules; |
1331 | struct net *net; | |
1aa6c4f6 | 1332 | int err; |
193125db | 1333 | |
53b94835 DA |
1334 | if (!data || !data[IFLA_VRF_TABLE]) { |
1335 | NL_SET_ERR_MSG(extack, "VRF table id is missing"); | |
193125db | 1336 | return -EINVAL; |
53b94835 | 1337 | } |
193125db DA |
1338 | |
1339 | vrf->tb_id = nla_get_u32(data[IFLA_VRF_TABLE]); | |
53b94835 DA |
1340 | if (vrf->tb_id == RT_TABLE_UNSPEC) { |
1341 | NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VRF_TABLE], | |
1342 | "Invalid VRF table id"); | |
24c63bbc | 1343 | return -EINVAL; |
53b94835 | 1344 | } |
193125db | 1345 | |
007979ea | 1346 | dev->priv_flags |= IFF_L3MDEV_MASTER; |
193125db | 1347 | |
1aa6c4f6 DA |
1348 | err = register_netdevice(dev); |
1349 | if (err) | |
1350 | goto out; | |
1351 | ||
097d3c95 DA |
1352 | net = dev_net(dev); |
1353 | add_fib_rules = net_generic(net, vrf_net_id); | |
1354 | if (*add_fib_rules) { | |
1aa6c4f6 DA |
1355 | err = vrf_add_fib_rules(dev); |
1356 | if (err) { | |
1357 | unregister_netdevice(dev); | |
1358 | goto out; | |
1359 | } | |
097d3c95 | 1360 | *add_fib_rules = false; |
1aa6c4f6 DA |
1361 | } |
1362 | ||
1363 | out: | |
1364 | return err; | |
193125db DA |
1365 | } |
1366 | ||
1367 | static size_t vrf_nl_getsize(const struct net_device *dev) | |
1368 | { | |
1369 | return nla_total_size(sizeof(u32)); /* IFLA_VRF_TABLE */ | |
1370 | } | |
1371 | ||
1372 | static int vrf_fillinfo(struct sk_buff *skb, | |
1373 | const struct net_device *dev) | |
1374 | { | |
1375 | struct net_vrf *vrf = netdev_priv(dev); | |
1376 | ||
1377 | return nla_put_u32(skb, IFLA_VRF_TABLE, vrf->tb_id); | |
1378 | } | |
1379 | ||
67eb0331 DA |
1380 | static size_t vrf_get_slave_size(const struct net_device *bond_dev, |
1381 | const struct net_device *slave_dev) | |
1382 | { | |
1383 | return nla_total_size(sizeof(u32)); /* IFLA_VRF_PORT_TABLE */ | |
1384 | } | |
1385 | ||
1386 | static int vrf_fill_slave_info(struct sk_buff *skb, | |
1387 | const struct net_device *vrf_dev, | |
1388 | const struct net_device *slave_dev) | |
1389 | { | |
1390 | struct net_vrf *vrf = netdev_priv(vrf_dev); | |
1391 | ||
1392 | if (nla_put_u32(skb, IFLA_VRF_PORT_TABLE, vrf->tb_id)) | |
1393 | return -EMSGSIZE; | |
1394 | ||
1395 | return 0; | |
1396 | } | |
1397 | ||
193125db DA |
1398 | static const struct nla_policy vrf_nl_policy[IFLA_VRF_MAX + 1] = { |
1399 | [IFLA_VRF_TABLE] = { .type = NLA_U32 }, | |
1400 | }; | |
1401 | ||
1402 | static struct rtnl_link_ops vrf_link_ops __read_mostly = { | |
1403 | .kind = DRV_NAME, | |
1404 | .priv_size = sizeof(struct net_vrf), | |
1405 | ||
1406 | .get_size = vrf_nl_getsize, | |
1407 | .policy = vrf_nl_policy, | |
1408 | .validate = vrf_validate, | |
1409 | .fill_info = vrf_fillinfo, | |
1410 | ||
67eb0331 DA |
1411 | .get_slave_size = vrf_get_slave_size, |
1412 | .fill_slave_info = vrf_fill_slave_info, | |
1413 | ||
193125db DA |
1414 | .newlink = vrf_newlink, |
1415 | .dellink = vrf_dellink, | |
1416 | .setup = vrf_setup, | |
1417 | .maxtype = IFLA_VRF_MAX, | |
1418 | }; | |
1419 | ||
1420 | static int vrf_device_event(struct notifier_block *unused, | |
1421 | unsigned long event, void *ptr) | |
1422 | { | |
1423 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
1424 | ||
1425 | /* only care about unregister events to drop slave references */ | |
1426 | if (event == NETDEV_UNREGISTER) { | |
193125db DA |
1427 | struct net_device *vrf_dev; |
1428 | ||
fee6d4c7 | 1429 | if (!netif_is_l3_slave(dev)) |
193125db DA |
1430 | goto out; |
1431 | ||
58aa9087 NA |
1432 | vrf_dev = netdev_master_upper_dev_get(dev); |
1433 | vrf_del_slave(vrf_dev, dev); | |
193125db DA |
1434 | } |
1435 | out: | |
1436 | return NOTIFY_DONE; | |
1437 | } | |
1438 | ||
1439 | static struct notifier_block vrf_notifier_block __read_mostly = { | |
1440 | .notifier_call = vrf_device_event, | |
1441 | }; | |
1442 | ||
097d3c95 DA |
1443 | /* Initialize per network namespace state */ |
1444 | static int __net_init vrf_netns_init(struct net *net) | |
1445 | { | |
1446 | bool *add_fib_rules = net_generic(net, vrf_net_id); | |
1447 | ||
1448 | *add_fib_rules = true; | |
1449 | ||
1450 | return 0; | |
1451 | } | |
1452 | ||
1453 | static struct pernet_operations vrf_net_ops __net_initdata = { | |
1454 | .init = vrf_netns_init, | |
1455 | .id = &vrf_net_id, | |
1456 | .size = sizeof(bool), | |
1457 | }; | |
1458 | ||
193125db DA |
1459 | static int __init vrf_init_module(void) |
1460 | { | |
1461 | int rc; | |
1462 | ||
193125db DA |
1463 | register_netdevice_notifier(&vrf_notifier_block); |
1464 | ||
097d3c95 | 1465 | rc = register_pernet_subsys(&vrf_net_ops); |
193125db DA |
1466 | if (rc < 0) |
1467 | goto error; | |
1468 | ||
097d3c95 DA |
1469 | rc = rtnl_link_register(&vrf_link_ops); |
1470 | if (rc < 0) { | |
1471 | unregister_pernet_subsys(&vrf_net_ops); | |
1472 | goto error; | |
1473 | } | |
1474 | ||
193125db DA |
1475 | return 0; |
1476 | ||
1477 | error: | |
1478 | unregister_netdevice_notifier(&vrf_notifier_block); | |
193125db DA |
1479 | return rc; |
1480 | } | |
1481 | ||
193125db | 1482 | module_init(vrf_init_module); |
193125db DA |
1483 | MODULE_AUTHOR("Shrijeet Mukherjee, David Ahern"); |
1484 | MODULE_DESCRIPTION("Device driver to instantiate VRF domains"); | |
1485 | MODULE_LICENSE("GPL"); | |
1486 | MODULE_ALIAS_RTNL_LINK(DRV_NAME); | |
1487 | MODULE_VERSION(DRV_VERSION); |