]>
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 | ||
35402e31 DA |
191 | dst = ip6_route_output(net, NULL, &fl6); |
192 | if (dst == dst_null) | |
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 | ||
477 | if (qdisc_tx_is_default(vrf_dev)) | |
478 | return vrf_ip6_out_direct(vrf_dev, sk, skb); | |
479 | ||
480 | return vrf_ip6_out_redirect(vrf_dev, skb); | |
481 | } | |
482 | ||
b0e95ccd | 483 | /* holding rtnl */ |
810e530b | 484 | static void vrf_rt6_release(struct net_device *dev, struct net_vrf *vrf) |
35402e31 | 485 | { |
b0e95ccd | 486 | struct rt6_info *rt6 = rtnl_dereference(vrf->rt6); |
810e530b DA |
487 | struct net *net = dev_net(dev); |
488 | struct dst_entry *dst; | |
b0e95ccd | 489 | |
b4869aa2 | 490 | RCU_INIT_POINTER(vrf->rt6, NULL); |
b4869aa2 | 491 | synchronize_rcu(); |
b0e95ccd | 492 | |
810e530b DA |
493 | /* move dev in dst's to loopback so this VRF device can be deleted |
494 | * - based on dst_ifdown | |
495 | */ | |
496 | if (rt6) { | |
497 | dst = &rt6->dst; | |
498 | dev_put(dst->dev); | |
499 | dst->dev = net->loopback_dev; | |
500 | dev_hold(dst->dev); | |
501 | dst_release(dst); | |
502 | } | |
35402e31 DA |
503 | } |
504 | ||
505 | static int vrf_rt6_create(struct net_device *dev) | |
506 | { | |
af13b3c3 | 507 | int flags = DST_NOPOLICY | DST_NOXFRM; |
35402e31 | 508 | struct net_vrf *vrf = netdev_priv(dev); |
9ab179d8 | 509 | struct net *net = dev_net(dev); |
4f04256c | 510 | struct rt6_info *rt6; |
35402e31 DA |
511 | int rc = -ENOMEM; |
512 | ||
e4348637 DA |
513 | /* IPv6 can be CONFIG enabled and then disabled runtime */ |
514 | if (!ipv6_mod_enabled()) | |
515 | return 0; | |
516 | ||
43b059a3 DA |
517 | vrf->fib6_table = fib6_new_table(net, vrf->tb_id); |
518 | if (!vrf->fib6_table) | |
b3b4663c DA |
519 | goto out; |
520 | ||
b4869aa2 DA |
521 | /* create a dst for routing packets out a VRF device */ |
522 | rt6 = ip6_dst_alloc(net, dev, flags); | |
35402e31 DA |
523 | if (!rt6) |
524 | goto out; | |
525 | ||
b3b4663c | 526 | rt6->dst.output = vrf_output6; |
b4869aa2 | 527 | |
b0e95ccd DA |
528 | rcu_assign_pointer(vrf->rt6, rt6); |
529 | ||
35402e31 DA |
530 | rc = 0; |
531 | out: | |
532 | return rc; | |
533 | } | |
534 | #else | |
4c1feac5 DA |
535 | static struct sk_buff *vrf_ip6_out(struct net_device *vrf_dev, |
536 | struct sock *sk, | |
537 | struct sk_buff *skb) | |
538 | { | |
539 | return skb; | |
540 | } | |
541 | ||
810e530b | 542 | static void vrf_rt6_release(struct net_device *dev, struct net_vrf *vrf) |
35402e31 DA |
543 | { |
544 | } | |
545 | ||
546 | static int vrf_rt6_create(struct net_device *dev) | |
547 | { | |
548 | return 0; | |
549 | } | |
550 | #endif | |
551 | ||
8f58336d | 552 | /* modelled after ip_finish_output2 */ |
0c4b51f0 | 553 | static int vrf_finish_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
193125db | 554 | { |
8f58336d DA |
555 | struct dst_entry *dst = skb_dst(skb); |
556 | struct rtable *rt = (struct rtable *)dst; | |
557 | struct net_device *dev = dst->dev; | |
558 | unsigned int hh_len = LL_RESERVED_SPACE(dev); | |
559 | struct neighbour *neigh; | |
5c9f7c1d | 560 | bool is_v6gw = false; |
8f58336d DA |
561 | int ret = -EINVAL; |
562 | ||
895b5c9f | 563 | nf_reset_ct(skb); |
eb63ecc1 | 564 | |
8f58336d DA |
565 | /* Be paranoid, rather than too clever. */ |
566 | if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) { | |
567 | struct sk_buff *skb2; | |
568 | ||
569 | skb2 = skb_realloc_headroom(skb, LL_RESERVED_SPACE(dev)); | |
570 | if (!skb2) { | |
571 | ret = -ENOMEM; | |
572 | goto err; | |
573 | } | |
574 | if (skb->sk) | |
575 | skb_set_owner_w(skb2, skb->sk); | |
576 | ||
577 | consume_skb(skb); | |
578 | skb = skb2; | |
579 | } | |
580 | ||
581 | rcu_read_lock_bh(); | |
582 | ||
5c9f7c1d | 583 | neigh = ip_neigh_for_gw(rt, skb, &is_v6gw); |
4ff06203 JA |
584 | if (!IS_ERR(neigh)) { |
585 | sock_confirm_neigh(skb, neigh); | |
5c9f7c1d DA |
586 | /* if crossing protocols, can not use the cached header */ |
587 | ret = neigh_output(neigh, skb, is_v6gw); | |
82dd0d2a DA |
588 | rcu_read_unlock_bh(); |
589 | return ret; | |
4ff06203 | 590 | } |
8f58336d DA |
591 | |
592 | rcu_read_unlock_bh(); | |
593 | err: | |
82dd0d2a | 594 | vrf_tx_error(skb->dev, skb); |
8f58336d | 595 | return ret; |
193125db DA |
596 | } |
597 | ||
ede2059d | 598 | static int vrf_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
193125db DA |
599 | { |
600 | struct net_device *dev = skb_dst(skb)->dev; | |
601 | ||
29a26a56 | 602 | IP_UPD_PO_STATS(net, IPSTATS_MIB_OUT, skb->len); |
193125db DA |
603 | |
604 | skb->dev = dev; | |
605 | skb->protocol = htons(ETH_P_IP); | |
606 | ||
29a26a56 EB |
607 | return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING, |
608 | net, sk, skb, NULL, dev, | |
8f58336d | 609 | vrf_finish_output, |
193125db DA |
610 | !(IPCB(skb)->flags & IPSKB_REROUTED)); |
611 | } | |
612 | ||
ebfc102c DA |
613 | /* set dst on skb to send packet to us via dev_xmit path. Allows |
614 | * packet to go through device based features such as qdisc, netfilter | |
615 | * hooks and packet sockets with skb->dev set to vrf device. | |
616 | */ | |
dcdd43c4 DA |
617 | static struct sk_buff *vrf_ip_out_redirect(struct net_device *vrf_dev, |
618 | struct sk_buff *skb) | |
ebfc102c DA |
619 | { |
620 | struct net_vrf *vrf = netdev_priv(vrf_dev); | |
621 | struct dst_entry *dst = NULL; | |
622 | struct rtable *rth; | |
623 | ||
624 | rcu_read_lock(); | |
625 | ||
626 | rth = rcu_dereference(vrf->rth); | |
627 | if (likely(rth)) { | |
628 | dst = &rth->dst; | |
629 | dst_hold(dst); | |
630 | } | |
631 | ||
632 | rcu_read_unlock(); | |
633 | ||
634 | if (unlikely(!dst)) { | |
635 | vrf_tx_error(vrf_dev, skb); | |
636 | return NULL; | |
637 | } | |
638 | ||
639 | skb_dst_drop(skb); | |
640 | skb_dst_set(skb, dst); | |
641 | ||
642 | return skb; | |
643 | } | |
644 | ||
dcdd43c4 DA |
645 | static int vrf_output_direct(struct net *net, struct sock *sk, |
646 | struct sk_buff *skb) | |
647 | { | |
648 | skb->protocol = htons(ETH_P_IP); | |
649 | ||
650 | return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING, | |
651 | net, sk, skb, NULL, skb->dev, | |
652 | vrf_finish_direct, | |
653 | !(IPCB(skb)->flags & IPSKB_REROUTED)); | |
654 | } | |
655 | ||
656 | static struct sk_buff *vrf_ip_out_direct(struct net_device *vrf_dev, | |
657 | struct sock *sk, | |
658 | struct sk_buff *skb) | |
659 | { | |
660 | struct net *net = dev_net(vrf_dev); | |
661 | int err; | |
662 | ||
663 | skb->dev = vrf_dev; | |
664 | ||
665 | err = nf_hook(NFPROTO_IPV4, NF_INET_LOCAL_OUT, net, sk, | |
666 | skb, NULL, vrf_dev, vrf_output_direct); | |
667 | ||
668 | if (likely(err == 1)) | |
669 | err = vrf_output_direct(net, sk, skb); | |
670 | ||
671 | /* reset skb device */ | |
672 | if (likely(err == 1)) | |
895b5c9f | 673 | nf_reset_ct(skb); |
dcdd43c4 DA |
674 | else |
675 | skb = NULL; | |
676 | ||
677 | return skb; | |
678 | } | |
679 | ||
680 | static struct sk_buff *vrf_ip_out(struct net_device *vrf_dev, | |
681 | struct sock *sk, | |
682 | struct sk_buff *skb) | |
683 | { | |
1e19c4d6 DA |
684 | /* don't divert multicast or local broadcast */ |
685 | if (ipv4_is_multicast(ip_hdr(skb)->daddr) || | |
686 | ipv4_is_lbcast(ip_hdr(skb)->daddr)) | |
dcdd43c4 DA |
687 | return skb; |
688 | ||
689 | if (qdisc_tx_is_default(vrf_dev)) | |
690 | return vrf_ip_out_direct(vrf_dev, sk, skb); | |
691 | ||
692 | return vrf_ip_out_redirect(vrf_dev, skb); | |
693 | } | |
694 | ||
ebfc102c DA |
695 | /* called with rcu lock held */ |
696 | static struct sk_buff *vrf_l3_out(struct net_device *vrf_dev, | |
697 | struct sock *sk, | |
698 | struct sk_buff *skb, | |
699 | u16 proto) | |
700 | { | |
701 | switch (proto) { | |
702 | case AF_INET: | |
703 | return vrf_ip_out(vrf_dev, sk, skb); | |
4c1feac5 DA |
704 | case AF_INET6: |
705 | return vrf_ip6_out(vrf_dev, sk, skb); | |
ebfc102c DA |
706 | } |
707 | ||
708 | return skb; | |
709 | } | |
710 | ||
b0e95ccd | 711 | /* holding rtnl */ |
810e530b | 712 | static void vrf_rtable_release(struct net_device *dev, struct net_vrf *vrf) |
193125db | 713 | { |
b0e95ccd | 714 | struct rtable *rth = rtnl_dereference(vrf->rth); |
810e530b DA |
715 | struct net *net = dev_net(dev); |
716 | struct dst_entry *dst; | |
b0e95ccd | 717 | |
afe80a49 | 718 | RCU_INIT_POINTER(vrf->rth, NULL); |
afe80a49 | 719 | synchronize_rcu(); |
193125db | 720 | |
810e530b DA |
721 | /* move dev in dst's to loopback so this VRF device can be deleted |
722 | * - based on dst_ifdown | |
723 | */ | |
724 | if (rth) { | |
725 | dst = &rth->dst; | |
726 | dev_put(dst->dev); | |
727 | dst->dev = net->loopback_dev; | |
728 | dev_hold(dst->dev); | |
729 | dst_release(dst); | |
730 | } | |
193125db DA |
731 | } |
732 | ||
b0e95ccd | 733 | static int vrf_rtable_create(struct net_device *dev) |
193125db | 734 | { |
b7503e0c | 735 | struct net_vrf *vrf = netdev_priv(dev); |
4f04256c | 736 | struct rtable *rth; |
193125db | 737 | |
b3b4663c | 738 | if (!fib_new_table(dev_net(dev), vrf->tb_id)) |
b0e95ccd | 739 | return -ENOMEM; |
b3b4663c | 740 | |
afe80a49 | 741 | /* create a dst for routing packets out through a VRF device */ |
af13b3c3 | 742 | rth = rt_dst_alloc(dev, 0, RTN_UNICAST, 1, 1); |
b0e95ccd DA |
743 | if (!rth) |
744 | return -ENOMEM; | |
193125db | 745 | |
b0e95ccd | 746 | rth->dst.output = vrf_output; |
b0e95ccd DA |
747 | |
748 | rcu_assign_pointer(vrf->rth, rth); | |
749 | ||
750 | return 0; | |
193125db DA |
751 | } |
752 | ||
753 | /**************************** device handling ********************/ | |
754 | ||
755 | /* cycle interface to flush neighbor cache and move routes across tables */ | |
dc1aea1e PM |
756 | static void cycle_netdev(struct net_device *dev, |
757 | struct netlink_ext_ack *extack) | |
193125db DA |
758 | { |
759 | unsigned int flags = dev->flags; | |
760 | int ret; | |
761 | ||
762 | if (!netif_running(dev)) | |
763 | return; | |
764 | ||
567c5e13 | 765 | ret = dev_change_flags(dev, flags & ~IFF_UP, extack); |
193125db | 766 | if (ret >= 0) |
567c5e13 | 767 | ret = dev_change_flags(dev, flags, extack); |
193125db DA |
768 | |
769 | if (ret < 0) { | |
770 | netdev_err(dev, | |
771 | "Failed to cycle device %s; route tables might be wrong!\n", | |
772 | dev->name); | |
773 | } | |
774 | } | |
775 | ||
42ab19ee DA |
776 | static int do_vrf_add_slave(struct net_device *dev, struct net_device *port_dev, |
777 | struct netlink_ext_ack *extack) | |
193125db | 778 | { |
bad53162 | 779 | int ret; |
193125db | 780 | |
26d31ac1 DA |
781 | /* do not allow loopback device to be enslaved to a VRF. |
782 | * The vrf device acts as the loopback for the vrf. | |
783 | */ | |
de3baa3e DA |
784 | if (port_dev == dev_net(dev)->loopback_dev) { |
785 | NL_SET_ERR_MSG(extack, | |
786 | "Can not enslave loopback device to a VRF"); | |
26d31ac1 | 787 | return -EOPNOTSUPP; |
de3baa3e | 788 | } |
26d31ac1 | 789 | |
fdeea7be | 790 | port_dev->priv_flags |= IFF_L3MDEV_SLAVE; |
42ab19ee | 791 | ret = netdev_master_upper_dev_link(port_dev, dev, NULL, NULL, extack); |
193125db | 792 | if (ret < 0) |
fdeea7be | 793 | goto err; |
193125db | 794 | |
dc1aea1e | 795 | cycle_netdev(port_dev, extack); |
193125db DA |
796 | |
797 | return 0; | |
fdeea7be IS |
798 | |
799 | err: | |
800 | port_dev->priv_flags &= ~IFF_L3MDEV_SLAVE; | |
801 | return ret; | |
193125db DA |
802 | } |
803 | ||
33eaf2a6 DA |
804 | static int vrf_add_slave(struct net_device *dev, struct net_device *port_dev, |
805 | struct netlink_ext_ack *extack) | |
193125db | 806 | { |
de3baa3e DA |
807 | if (netif_is_l3_master(port_dev)) { |
808 | NL_SET_ERR_MSG(extack, | |
809 | "Can not enslave an L3 master device to a VRF"); | |
810 | return -EINVAL; | |
811 | } | |
812 | ||
813 | if (netif_is_l3_slave(port_dev)) | |
193125db DA |
814 | return -EINVAL; |
815 | ||
42ab19ee | 816 | return do_vrf_add_slave(dev, port_dev, extack); |
193125db DA |
817 | } |
818 | ||
819 | /* inverse of do_vrf_add_slave */ | |
820 | static int do_vrf_del_slave(struct net_device *dev, struct net_device *port_dev) | |
821 | { | |
193125db | 822 | netdev_upper_dev_unlink(port_dev, dev); |
fee6d4c7 | 823 | port_dev->priv_flags &= ~IFF_L3MDEV_SLAVE; |
193125db | 824 | |
dc1aea1e | 825 | cycle_netdev(port_dev, NULL); |
193125db | 826 | |
193125db DA |
827 | return 0; |
828 | } | |
829 | ||
830 | static int vrf_del_slave(struct net_device *dev, struct net_device *port_dev) | |
831 | { | |
193125db DA |
832 | return do_vrf_del_slave(dev, port_dev); |
833 | } | |
834 | ||
835 | static void vrf_dev_uninit(struct net_device *dev) | |
836 | { | |
837 | struct net_vrf *vrf = netdev_priv(dev); | |
193125db | 838 | |
810e530b DA |
839 | vrf_rtable_release(dev, vrf); |
840 | vrf_rt6_release(dev, vrf); | |
193125db | 841 | |
3a4a27d3 | 842 | free_percpu(dev->dstats); |
193125db DA |
843 | dev->dstats = NULL; |
844 | } | |
845 | ||
846 | static int vrf_dev_init(struct net_device *dev) | |
847 | { | |
848 | struct net_vrf *vrf = netdev_priv(dev); | |
849 | ||
193125db DA |
850 | dev->dstats = netdev_alloc_pcpu_stats(struct pcpu_dstats); |
851 | if (!dev->dstats) | |
852 | goto out_nomem; | |
853 | ||
854 | /* create the default dst which points back to us */ | |
b0e95ccd | 855 | if (vrf_rtable_create(dev) != 0) |
193125db DA |
856 | goto out_stats; |
857 | ||
35402e31 DA |
858 | if (vrf_rt6_create(dev) != 0) |
859 | goto out_rth; | |
860 | ||
193125db DA |
861 | dev->flags = IFF_MASTER | IFF_NOARP; |
862 | ||
b87ab6b8 DA |
863 | /* MTU is irrelevant for VRF device; set to 64k similar to lo */ |
864 | dev->mtu = 64 * 1024; | |
865 | ||
866 | /* similarly, oper state is irrelevant; set to up to avoid confusion */ | |
867 | dev->operstate = IF_OPER_UP; | |
193125db DA |
868 | return 0; |
869 | ||
35402e31 | 870 | out_rth: |
810e530b | 871 | vrf_rtable_release(dev, vrf); |
193125db DA |
872 | out_stats: |
873 | free_percpu(dev->dstats); | |
874 | dev->dstats = NULL; | |
875 | out_nomem: | |
876 | return -ENOMEM; | |
877 | } | |
878 | ||
879 | static const struct net_device_ops vrf_netdev_ops = { | |
880 | .ndo_init = vrf_dev_init, | |
881 | .ndo_uninit = vrf_dev_uninit, | |
882 | .ndo_start_xmit = vrf_xmit, | |
6819e3f6 | 883 | .ndo_set_mac_address = eth_mac_addr, |
193125db DA |
884 | .ndo_get_stats64 = vrf_get_stats64, |
885 | .ndo_add_slave = vrf_add_slave, | |
886 | .ndo_del_slave = vrf_del_slave, | |
887 | }; | |
888 | ||
ee15ee5d DA |
889 | static u32 vrf_fib_table(const struct net_device *dev) |
890 | { | |
891 | struct net_vrf *vrf = netdev_priv(dev); | |
892 | ||
893 | return vrf->tb_id; | |
894 | } | |
895 | ||
73e20b76 DA |
896 | static int vrf_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb) |
897 | { | |
1a4a5bf5 | 898 | kfree_skb(skb); |
73e20b76 DA |
899 | return 0; |
900 | } | |
901 | ||
902 | static struct sk_buff *vrf_rcv_nfhook(u8 pf, unsigned int hook, | |
903 | struct sk_buff *skb, | |
904 | struct net_device *dev) | |
905 | { | |
906 | struct net *net = dev_net(dev); | |
907 | ||
1a4a5bf5 | 908 | if (nf_hook(pf, hook, net, NULL, skb, dev, NULL, vrf_rcv_finish) != 1) |
73e20b76 DA |
909 | skb = NULL; /* kfree_skb(skb) handled by nf code */ |
910 | ||
911 | return skb; | |
912 | } | |
913 | ||
74b20582 DA |
914 | #if IS_ENABLED(CONFIG_IPV6) |
915 | /* neighbor handling is done with actual device; do not want | |
916 | * to flip skb->dev for those ndisc packets. This really fails | |
917 | * for multiple next protocols (e.g., NEXTHDR_HOP). But it is | |
918 | * a start. | |
919 | */ | |
920 | static bool ipv6_ndisc_frame(const struct sk_buff *skb) | |
921 | { | |
922 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
923 | bool rc = false; | |
924 | ||
925 | if (iph->nexthdr == NEXTHDR_ICMP) { | |
926 | const struct icmp6hdr *icmph; | |
927 | struct icmp6hdr _icmph; | |
928 | ||
929 | icmph = skb_header_pointer(skb, sizeof(*iph), | |
930 | sizeof(_icmph), &_icmph); | |
931 | if (!icmph) | |
932 | goto out; | |
933 | ||
934 | switch (icmph->icmp6_type) { | |
935 | case NDISC_ROUTER_SOLICITATION: | |
936 | case NDISC_ROUTER_ADVERTISEMENT: | |
937 | case NDISC_NEIGHBOUR_SOLICITATION: | |
938 | case NDISC_NEIGHBOUR_ADVERTISEMENT: | |
939 | case NDISC_REDIRECT: | |
940 | rc = true; | |
941 | break; | |
942 | } | |
943 | } | |
944 | ||
945 | out: | |
946 | return rc; | |
947 | } | |
948 | ||
9ff74384 DA |
949 | static struct rt6_info *vrf_ip6_route_lookup(struct net *net, |
950 | const struct net_device *dev, | |
951 | struct flowi6 *fl6, | |
952 | int ifindex, | |
b75cc8f9 | 953 | const struct sk_buff *skb, |
9ff74384 DA |
954 | int flags) |
955 | { | |
956 | struct net_vrf *vrf = netdev_priv(dev); | |
9ff74384 | 957 | |
43b059a3 | 958 | return ip6_pol_route(net, vrf->fib6_table, ifindex, fl6, skb, flags); |
9ff74384 DA |
959 | } |
960 | ||
961 | static void vrf_ip6_input_dst(struct sk_buff *skb, struct net_device *vrf_dev, | |
962 | int ifindex) | |
963 | { | |
964 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
965 | struct flowi6 fl6 = { | |
ecf09117 AB |
966 | .flowi6_iif = ifindex, |
967 | .flowi6_mark = skb->mark, | |
968 | .flowi6_proto = iph->nexthdr, | |
9ff74384 DA |
969 | .daddr = iph->daddr, |
970 | .saddr = iph->saddr, | |
971 | .flowlabel = ip6_flowinfo(iph), | |
9ff74384 DA |
972 | }; |
973 | struct net *net = dev_net(vrf_dev); | |
974 | struct rt6_info *rt6; | |
975 | ||
b75cc8f9 | 976 | rt6 = vrf_ip6_route_lookup(net, vrf_dev, &fl6, ifindex, skb, |
9ff74384 DA |
977 | RT6_LOOKUP_F_HAS_SADDR | RT6_LOOKUP_F_IFACE); |
978 | if (unlikely(!rt6)) | |
979 | return; | |
980 | ||
981 | if (unlikely(&rt6->dst == &net->ipv6.ip6_null_entry->dst)) | |
982 | return; | |
983 | ||
984 | skb_dst_set(skb, &rt6->dst); | |
985 | } | |
986 | ||
74b20582 DA |
987 | static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev, |
988 | struct sk_buff *skb) | |
989 | { | |
9ff74384 | 990 | int orig_iif = skb->skb_iif; |
6f12fa77 MM |
991 | bool need_strict = rt6_need_strict(&ipv6_hdr(skb)->daddr); |
992 | bool is_ndisc = ipv6_ndisc_frame(skb); | |
9ff74384 | 993 | |
6f12fa77 MM |
994 | /* loopback, multicast & non-ND link-local traffic; do not push through |
995 | * packet taps again. Reset pkt_type for upper layers to process skb | |
b4869aa2 | 996 | */ |
6f12fa77 | 997 | if (skb->pkt_type == PACKET_LOOPBACK || (need_strict && !is_ndisc)) { |
b4869aa2 DA |
998 | skb->dev = vrf_dev; |
999 | skb->skb_iif = vrf_dev->ifindex; | |
a04a480d | 1000 | IP6CB(skb)->flags |= IP6SKB_L3SLAVE; |
6f12fa77 MM |
1001 | if (skb->pkt_type == PACKET_LOOPBACK) |
1002 | skb->pkt_type = PACKET_HOST; | |
b4869aa2 DA |
1003 | goto out; |
1004 | } | |
1005 | ||
6f12fa77 MM |
1006 | /* if packet is NDISC then keep the ingress interface */ |
1007 | if (!is_ndisc) { | |
926d93a3 | 1008 | vrf_rx_stats(vrf_dev, skb->len); |
74b20582 DA |
1009 | skb->dev = vrf_dev; |
1010 | skb->skb_iif = vrf_dev->ifindex; | |
1011 | ||
a9ec54d1 DA |
1012 | if (!list_empty(&vrf_dev->ptype_all)) { |
1013 | skb_push(skb, skb->mac_len); | |
1014 | dev_queue_xmit_nit(skb, vrf_dev); | |
1015 | skb_pull(skb, skb->mac_len); | |
1016 | } | |
74b20582 DA |
1017 | |
1018 | IP6CB(skb)->flags |= IP6SKB_L3SLAVE; | |
1019 | } | |
1020 | ||
9ff74384 DA |
1021 | if (need_strict) |
1022 | vrf_ip6_input_dst(skb, vrf_dev, orig_iif); | |
1023 | ||
73e20b76 | 1024 | skb = vrf_rcv_nfhook(NFPROTO_IPV6, NF_INET_PRE_ROUTING, skb, vrf_dev); |
b4869aa2 | 1025 | out: |
74b20582 DA |
1026 | return skb; |
1027 | } | |
1028 | ||
1029 | #else | |
1030 | static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev, | |
1031 | struct sk_buff *skb) | |
1032 | { | |
1033 | return skb; | |
1034 | } | |
1035 | #endif | |
1036 | ||
1037 | static struct sk_buff *vrf_ip_rcv(struct net_device *vrf_dev, | |
1038 | struct sk_buff *skb) | |
1039 | { | |
1040 | skb->dev = vrf_dev; | |
1041 | skb->skb_iif = vrf_dev->ifindex; | |
a04a480d | 1042 | IPCB(skb)->flags |= IPSKB_L3SLAVE; |
74b20582 | 1043 | |
e58e4159 DA |
1044 | if (ipv4_is_multicast(ip_hdr(skb)->daddr)) |
1045 | goto out; | |
1046 | ||
afe80a49 DA |
1047 | /* loopback traffic; do not push through packet taps again. |
1048 | * Reset pkt_type for upper layers to process skb | |
1049 | */ | |
1050 | if (skb->pkt_type == PACKET_LOOPBACK) { | |
1051 | skb->pkt_type = PACKET_HOST; | |
1052 | goto out; | |
1053 | } | |
1054 | ||
926d93a3 DA |
1055 | vrf_rx_stats(vrf_dev, skb->len); |
1056 | ||
dcdd43c4 DA |
1057 | if (!list_empty(&vrf_dev->ptype_all)) { |
1058 | skb_push(skb, skb->mac_len); | |
1059 | dev_queue_xmit_nit(skb, vrf_dev); | |
1060 | skb_pull(skb, skb->mac_len); | |
1061 | } | |
74b20582 | 1062 | |
73e20b76 | 1063 | skb = vrf_rcv_nfhook(NFPROTO_IPV4, NF_INET_PRE_ROUTING, skb, vrf_dev); |
afe80a49 | 1064 | out: |
74b20582 DA |
1065 | return skb; |
1066 | } | |
1067 | ||
1068 | /* called with rcu lock held */ | |
1069 | static struct sk_buff *vrf_l3_rcv(struct net_device *vrf_dev, | |
1070 | struct sk_buff *skb, | |
1071 | u16 proto) | |
1072 | { | |
1073 | switch (proto) { | |
1074 | case AF_INET: | |
1075 | return vrf_ip_rcv(vrf_dev, skb); | |
1076 | case AF_INET6: | |
1077 | return vrf_ip6_rcv(vrf_dev, skb); | |
1078 | } | |
1079 | ||
1080 | return skb; | |
1081 | } | |
1082 | ||
35402e31 | 1083 | #if IS_ENABLED(CONFIG_IPV6) |
4c1feac5 DA |
1084 | /* send to link-local or multicast address via interface enslaved to |
1085 | * VRF device. Force lookup to VRF table without changing flow struct | |
7d9e5f42 WW |
1086 | * Note: Caller to this function must hold rcu_read_lock() and no refcnt |
1087 | * is taken on the dst by this function. | |
4c1feac5 DA |
1088 | */ |
1089 | static struct dst_entry *vrf_link_scope_lookup(const struct net_device *dev, | |
1090 | struct flowi6 *fl6) | |
35402e31 | 1091 | { |
9ff74384 | 1092 | struct net *net = dev_net(dev); |
7d9e5f42 | 1093 | int flags = RT6_LOOKUP_F_IFACE | RT6_LOOKUP_F_DST_NOREF; |
b0e95ccd | 1094 | struct dst_entry *dst = NULL; |
9ff74384 | 1095 | struct rt6_info *rt; |
35402e31 | 1096 | |
4c1feac5 DA |
1097 | /* VRF device does not have a link-local address and |
1098 | * sending packets to link-local or mcast addresses over | |
1099 | * a VRF device does not make sense | |
1100 | */ | |
1101 | if (fl6->flowi6_oif == dev->ifindex) { | |
1102 | dst = &net->ipv6.ip6_null_entry->dst; | |
4c1feac5 | 1103 | return dst; |
35402e31 DA |
1104 | } |
1105 | ||
4c1feac5 DA |
1106 | if (!ipv6_addr_any(&fl6->saddr)) |
1107 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
1108 | ||
b75cc8f9 | 1109 | rt = vrf_ip6_route_lookup(net, dev, fl6, fl6->flowi6_oif, NULL, flags); |
4c1feac5 DA |
1110 | if (rt) |
1111 | dst = &rt->dst; | |
9ff74384 | 1112 | |
b0e95ccd | 1113 | return dst; |
35402e31 DA |
1114 | } |
1115 | #endif | |
1116 | ||
ee15ee5d DA |
1117 | static const struct l3mdev_ops vrf_l3mdev_ops = { |
1118 | .l3mdev_fib_table = vrf_fib_table, | |
74b20582 | 1119 | .l3mdev_l3_rcv = vrf_l3_rcv, |
ebfc102c | 1120 | .l3mdev_l3_out = vrf_l3_out, |
35402e31 | 1121 | #if IS_ENABLED(CONFIG_IPV6) |
4c1feac5 | 1122 | .l3mdev_link_scope_lookup = vrf_link_scope_lookup, |
35402e31 | 1123 | #endif |
ee15ee5d DA |
1124 | }; |
1125 | ||
193125db DA |
1126 | static void vrf_get_drvinfo(struct net_device *dev, |
1127 | struct ethtool_drvinfo *info) | |
1128 | { | |
1129 | strlcpy(info->driver, DRV_NAME, sizeof(info->driver)); | |
1130 | strlcpy(info->version, DRV_VERSION, sizeof(info->version)); | |
1131 | } | |
1132 | ||
1133 | static const struct ethtool_ops vrf_ethtool_ops = { | |
1134 | .get_drvinfo = vrf_get_drvinfo, | |
1135 | }; | |
1136 | ||
1aa6c4f6 DA |
1137 | static inline size_t vrf_fib_rule_nl_size(void) |
1138 | { | |
1139 | size_t sz; | |
1140 | ||
1141 | sz = NLMSG_ALIGN(sizeof(struct fib_rule_hdr)); | |
1142 | sz += nla_total_size(sizeof(u8)); /* FRA_L3MDEV */ | |
1143 | sz += nla_total_size(sizeof(u32)); /* FRA_PRIORITY */ | |
1b71af60 | 1144 | sz += nla_total_size(sizeof(u8)); /* FRA_PROTOCOL */ |
1aa6c4f6 DA |
1145 | |
1146 | return sz; | |
1147 | } | |
1148 | ||
1149 | static int vrf_fib_rule(const struct net_device *dev, __u8 family, bool add_it) | |
1150 | { | |
1151 | struct fib_rule_hdr *frh; | |
1152 | struct nlmsghdr *nlh; | |
1153 | struct sk_buff *skb; | |
1154 | int err; | |
1155 | ||
dac91170 DA |
1156 | if ((family == AF_INET6 || family == RTNL_FAMILY_IP6MR) && |
1157 | !ipv6_mod_enabled()) | |
e4348637 DA |
1158 | return 0; |
1159 | ||
1aa6c4f6 DA |
1160 | skb = nlmsg_new(vrf_fib_rule_nl_size(), GFP_KERNEL); |
1161 | if (!skb) | |
1162 | return -ENOMEM; | |
1163 | ||
1164 | nlh = nlmsg_put(skb, 0, 0, 0, sizeof(*frh), 0); | |
1165 | if (!nlh) | |
1166 | goto nla_put_failure; | |
1167 | ||
1168 | /* rule only needs to appear once */ | |
426c87ca | 1169 | nlh->nlmsg_flags |= NLM_F_EXCL; |
1aa6c4f6 DA |
1170 | |
1171 | frh = nlmsg_data(nlh); | |
1172 | memset(frh, 0, sizeof(*frh)); | |
1173 | frh->family = family; | |
1174 | frh->action = FR_ACT_TO_TBL; | |
1b71af60 DS |
1175 | |
1176 | if (nla_put_u8(skb, FRA_PROTOCOL, RTPROT_KERNEL)) | |
1177 | goto nla_put_failure; | |
1aa6c4f6 | 1178 | |
18129a24 | 1179 | if (nla_put_u8(skb, FRA_L3MDEV, 1)) |
1aa6c4f6 DA |
1180 | goto nla_put_failure; |
1181 | ||
1182 | if (nla_put_u32(skb, FRA_PRIORITY, FIB_RULE_PREF)) | |
1183 | goto nla_put_failure; | |
1184 | ||
1185 | nlmsg_end(skb, nlh); | |
1186 | ||
1187 | /* fib_nl_{new,del}rule handling looks for net from skb->sk */ | |
1188 | skb->sk = dev_net(dev)->rtnl; | |
1189 | if (add_it) { | |
c21ef3e3 | 1190 | err = fib_nl_newrule(skb, nlh, NULL); |
1aa6c4f6 DA |
1191 | if (err == -EEXIST) |
1192 | err = 0; | |
1193 | } else { | |
c21ef3e3 | 1194 | err = fib_nl_delrule(skb, nlh, NULL); |
1aa6c4f6 DA |
1195 | if (err == -ENOENT) |
1196 | err = 0; | |
1197 | } | |
1198 | nlmsg_free(skb); | |
1199 | ||
1200 | return err; | |
1201 | ||
1202 | nla_put_failure: | |
1203 | nlmsg_free(skb); | |
1204 | ||
1205 | return -EMSGSIZE; | |
1206 | } | |
1207 | ||
1208 | static int vrf_add_fib_rules(const struct net_device *dev) | |
1209 | { | |
1210 | int err; | |
1211 | ||
1212 | err = vrf_fib_rule(dev, AF_INET, true); | |
1213 | if (err < 0) | |
1214 | goto out_err; | |
1215 | ||
1216 | err = vrf_fib_rule(dev, AF_INET6, true); | |
1217 | if (err < 0) | |
1218 | goto ipv6_err; | |
1219 | ||
e58e4159 DA |
1220 | #if IS_ENABLED(CONFIG_IP_MROUTE_MULTIPLE_TABLES) |
1221 | err = vrf_fib_rule(dev, RTNL_FAMILY_IPMR, true); | |
1222 | if (err < 0) | |
1223 | goto ipmr_err; | |
1224 | #endif | |
1225 | ||
e4a38c0c PR |
1226 | #if IS_ENABLED(CONFIG_IPV6_MROUTE_MULTIPLE_TABLES) |
1227 | err = vrf_fib_rule(dev, RTNL_FAMILY_IP6MR, true); | |
1228 | if (err < 0) | |
1229 | goto ip6mr_err; | |
1230 | #endif | |
1231 | ||
1aa6c4f6 DA |
1232 | return 0; |
1233 | ||
e4a38c0c PR |
1234 | #if IS_ENABLED(CONFIG_IPV6_MROUTE_MULTIPLE_TABLES) |
1235 | ip6mr_err: | |
1236 | vrf_fib_rule(dev, RTNL_FAMILY_IPMR, false); | |
1237 | #endif | |
1238 | ||
e58e4159 DA |
1239 | #if IS_ENABLED(CONFIG_IP_MROUTE_MULTIPLE_TABLES) |
1240 | ipmr_err: | |
1241 | vrf_fib_rule(dev, AF_INET6, false); | |
1242 | #endif | |
1243 | ||
1aa6c4f6 DA |
1244 | ipv6_err: |
1245 | vrf_fib_rule(dev, AF_INET, false); | |
1246 | ||
1247 | out_err: | |
1248 | netdev_err(dev, "Failed to add FIB rules.\n"); | |
1249 | return err; | |
1250 | } | |
1251 | ||
193125db DA |
1252 | static void vrf_setup(struct net_device *dev) |
1253 | { | |
1254 | ether_setup(dev); | |
1255 | ||
1256 | /* Initialize the device structure. */ | |
1257 | dev->netdev_ops = &vrf_netdev_ops; | |
ee15ee5d | 1258 | dev->l3mdev_ops = &vrf_l3mdev_ops; |
193125db | 1259 | dev->ethtool_ops = &vrf_ethtool_ops; |
cf124db5 | 1260 | dev->needs_free_netdev = true; |
193125db DA |
1261 | |
1262 | /* Fill in device structure with ethernet-generic values. */ | |
1263 | eth_hw_addr_random(dev); | |
1264 | ||
1265 | /* don't acquire vrf device's netif_tx_lock when transmitting */ | |
1266 | dev->features |= NETIF_F_LLTX; | |
1267 | ||
1268 | /* don't allow vrf devices to change network namespaces. */ | |
1269 | dev->features |= NETIF_F_NETNS_LOCAL; | |
7889681f DA |
1270 | |
1271 | /* does not make sense for a VLAN to be added to a vrf device */ | |
1272 | dev->features |= NETIF_F_VLAN_CHALLENGED; | |
1273 | ||
1274 | /* enable offload features */ | |
1275 | dev->features |= NETIF_F_GSO_SOFTWARE; | |
cb160394 | 1276 | dev->features |= NETIF_F_RXCSUM | NETIF_F_HW_CSUM | NETIF_F_SCTP_CRC; |
7889681f DA |
1277 | dev->features |= NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA; |
1278 | ||
1279 | dev->hw_features = dev->features; | |
1280 | dev->hw_enc_features = dev->features; | |
1281 | ||
1282 | /* default to no qdisc; user can add if desired */ | |
1283 | dev->priv_flags |= IFF_NO_QUEUE; | |
1017e098 | 1284 | dev->priv_flags |= IFF_NO_RX_HANDLER; |
6819e3f6 | 1285 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
ad49bc63 | 1286 | |
5055376a ML |
1287 | /* VRF devices do not care about MTU, but if the MTU is set |
1288 | * too low then the ipv4 and ipv6 protocols are disabled | |
1289 | * which breaks networking. | |
1290 | */ | |
1291 | dev->min_mtu = IPV6_MIN_MTU; | |
1292 | dev->max_mtu = ETH_MAX_MTU; | |
193125db DA |
1293 | } |
1294 | ||
a8b8a889 MS |
1295 | static int vrf_validate(struct nlattr *tb[], struct nlattr *data[], |
1296 | struct netlink_ext_ack *extack) | |
193125db DA |
1297 | { |
1298 | if (tb[IFLA_ADDRESS]) { | |
53b94835 DA |
1299 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) { |
1300 | NL_SET_ERR_MSG(extack, "Invalid hardware address"); | |
193125db | 1301 | return -EINVAL; |
53b94835 DA |
1302 | } |
1303 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) { | |
1304 | NL_SET_ERR_MSG(extack, "Invalid hardware address"); | |
193125db | 1305 | return -EADDRNOTAVAIL; |
53b94835 | 1306 | } |
193125db DA |
1307 | } |
1308 | return 0; | |
1309 | } | |
1310 | ||
1311 | static void vrf_dellink(struct net_device *dev, struct list_head *head) | |
1312 | { | |
f630c38e NA |
1313 | struct net_device *port_dev; |
1314 | struct list_head *iter; | |
1315 | ||
1316 | netdev_for_each_lower_dev(dev, port_dev, iter) | |
1317 | vrf_del_slave(dev, port_dev); | |
1318 | ||
193125db DA |
1319 | unregister_netdevice_queue(dev, head); |
1320 | } | |
1321 | ||
1322 | static int vrf_newlink(struct net *src_net, struct net_device *dev, | |
7a3f4a18 MS |
1323 | struct nlattr *tb[], struct nlattr *data[], |
1324 | struct netlink_ext_ack *extack) | |
193125db DA |
1325 | { |
1326 | struct net_vrf *vrf = netdev_priv(dev); | |
097d3c95 DA |
1327 | bool *add_fib_rules; |
1328 | struct net *net; | |
1aa6c4f6 | 1329 | int err; |
193125db | 1330 | |
53b94835 DA |
1331 | if (!data || !data[IFLA_VRF_TABLE]) { |
1332 | NL_SET_ERR_MSG(extack, "VRF table id is missing"); | |
193125db | 1333 | return -EINVAL; |
53b94835 | 1334 | } |
193125db DA |
1335 | |
1336 | vrf->tb_id = nla_get_u32(data[IFLA_VRF_TABLE]); | |
53b94835 DA |
1337 | if (vrf->tb_id == RT_TABLE_UNSPEC) { |
1338 | NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VRF_TABLE], | |
1339 | "Invalid VRF table id"); | |
24c63bbc | 1340 | return -EINVAL; |
53b94835 | 1341 | } |
193125db | 1342 | |
007979ea | 1343 | dev->priv_flags |= IFF_L3MDEV_MASTER; |
193125db | 1344 | |
1aa6c4f6 DA |
1345 | err = register_netdevice(dev); |
1346 | if (err) | |
1347 | goto out; | |
1348 | ||
097d3c95 DA |
1349 | net = dev_net(dev); |
1350 | add_fib_rules = net_generic(net, vrf_net_id); | |
1351 | if (*add_fib_rules) { | |
1aa6c4f6 DA |
1352 | err = vrf_add_fib_rules(dev); |
1353 | if (err) { | |
1354 | unregister_netdevice(dev); | |
1355 | goto out; | |
1356 | } | |
097d3c95 | 1357 | *add_fib_rules = false; |
1aa6c4f6 DA |
1358 | } |
1359 | ||
1360 | out: | |
1361 | return err; | |
193125db DA |
1362 | } |
1363 | ||
1364 | static size_t vrf_nl_getsize(const struct net_device *dev) | |
1365 | { | |
1366 | return nla_total_size(sizeof(u32)); /* IFLA_VRF_TABLE */ | |
1367 | } | |
1368 | ||
1369 | static int vrf_fillinfo(struct sk_buff *skb, | |
1370 | const struct net_device *dev) | |
1371 | { | |
1372 | struct net_vrf *vrf = netdev_priv(dev); | |
1373 | ||
1374 | return nla_put_u32(skb, IFLA_VRF_TABLE, vrf->tb_id); | |
1375 | } | |
1376 | ||
67eb0331 DA |
1377 | static size_t vrf_get_slave_size(const struct net_device *bond_dev, |
1378 | const struct net_device *slave_dev) | |
1379 | { | |
1380 | return nla_total_size(sizeof(u32)); /* IFLA_VRF_PORT_TABLE */ | |
1381 | } | |
1382 | ||
1383 | static int vrf_fill_slave_info(struct sk_buff *skb, | |
1384 | const struct net_device *vrf_dev, | |
1385 | const struct net_device *slave_dev) | |
1386 | { | |
1387 | struct net_vrf *vrf = netdev_priv(vrf_dev); | |
1388 | ||
1389 | if (nla_put_u32(skb, IFLA_VRF_PORT_TABLE, vrf->tb_id)) | |
1390 | return -EMSGSIZE; | |
1391 | ||
1392 | return 0; | |
1393 | } | |
1394 | ||
193125db DA |
1395 | static const struct nla_policy vrf_nl_policy[IFLA_VRF_MAX + 1] = { |
1396 | [IFLA_VRF_TABLE] = { .type = NLA_U32 }, | |
1397 | }; | |
1398 | ||
1399 | static struct rtnl_link_ops vrf_link_ops __read_mostly = { | |
1400 | .kind = DRV_NAME, | |
1401 | .priv_size = sizeof(struct net_vrf), | |
1402 | ||
1403 | .get_size = vrf_nl_getsize, | |
1404 | .policy = vrf_nl_policy, | |
1405 | .validate = vrf_validate, | |
1406 | .fill_info = vrf_fillinfo, | |
1407 | ||
67eb0331 DA |
1408 | .get_slave_size = vrf_get_slave_size, |
1409 | .fill_slave_info = vrf_fill_slave_info, | |
1410 | ||
193125db DA |
1411 | .newlink = vrf_newlink, |
1412 | .dellink = vrf_dellink, | |
1413 | .setup = vrf_setup, | |
1414 | .maxtype = IFLA_VRF_MAX, | |
1415 | }; | |
1416 | ||
1417 | static int vrf_device_event(struct notifier_block *unused, | |
1418 | unsigned long event, void *ptr) | |
1419 | { | |
1420 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
1421 | ||
1422 | /* only care about unregister events to drop slave references */ | |
1423 | if (event == NETDEV_UNREGISTER) { | |
193125db DA |
1424 | struct net_device *vrf_dev; |
1425 | ||
fee6d4c7 | 1426 | if (!netif_is_l3_slave(dev)) |
193125db DA |
1427 | goto out; |
1428 | ||
58aa9087 NA |
1429 | vrf_dev = netdev_master_upper_dev_get(dev); |
1430 | vrf_del_slave(vrf_dev, dev); | |
193125db DA |
1431 | } |
1432 | out: | |
1433 | return NOTIFY_DONE; | |
1434 | } | |
1435 | ||
1436 | static struct notifier_block vrf_notifier_block __read_mostly = { | |
1437 | .notifier_call = vrf_device_event, | |
1438 | }; | |
1439 | ||
097d3c95 DA |
1440 | /* Initialize per network namespace state */ |
1441 | static int __net_init vrf_netns_init(struct net *net) | |
1442 | { | |
1443 | bool *add_fib_rules = net_generic(net, vrf_net_id); | |
1444 | ||
1445 | *add_fib_rules = true; | |
1446 | ||
1447 | return 0; | |
1448 | } | |
1449 | ||
1450 | static struct pernet_operations vrf_net_ops __net_initdata = { | |
1451 | .init = vrf_netns_init, | |
1452 | .id = &vrf_net_id, | |
1453 | .size = sizeof(bool), | |
1454 | }; | |
1455 | ||
193125db DA |
1456 | static int __init vrf_init_module(void) |
1457 | { | |
1458 | int rc; | |
1459 | ||
193125db DA |
1460 | register_netdevice_notifier(&vrf_notifier_block); |
1461 | ||
097d3c95 | 1462 | rc = register_pernet_subsys(&vrf_net_ops); |
193125db DA |
1463 | if (rc < 0) |
1464 | goto error; | |
1465 | ||
097d3c95 DA |
1466 | rc = rtnl_link_register(&vrf_link_ops); |
1467 | if (rc < 0) { | |
1468 | unregister_pernet_subsys(&vrf_net_ops); | |
1469 | goto error; | |
1470 | } | |
1471 | ||
193125db DA |
1472 | return 0; |
1473 | ||
1474 | error: | |
1475 | unregister_netdevice_notifier(&vrf_notifier_block); | |
193125db DA |
1476 | return rc; |
1477 | } | |
1478 | ||
193125db | 1479 | module_init(vrf_init_module); |
193125db DA |
1480 | MODULE_AUTHOR("Shrijeet Mukherjee, David Ahern"); |
1481 | MODULE_DESCRIPTION("Device driver to instantiate VRF domains"); | |
1482 | MODULE_LICENSE("GPL"); | |
1483 | MODULE_ALIAS_RTNL_LINK(DRV_NAME); | |
1484 | MODULE_VERSION(DRV_VERSION); |