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Commit | Line | Data |
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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 | { | |
168 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
169 | struct net *net = dev_net(skb->dev); | |
170 | struct flowi6 fl6 = { | |
171 | /* needed to match OIF rule */ | |
172 | .flowi6_oif = dev->ifindex, | |
173 | .flowi6_iif = LOOPBACK_IFINDEX, | |
174 | .daddr = iph->daddr, | |
175 | .saddr = iph->saddr, | |
176 | .flowlabel = ip6_flowinfo(iph), | |
177 | .flowi6_mark = skb->mark, | |
178 | .flowi6_proto = iph->nexthdr, | |
c71ad3d4 | 179 | .flowi6_flags = FLOWI_FLAG_SKIP_NH_OIF, |
35402e31 DA |
180 | }; |
181 | int ret = NET_XMIT_DROP; | |
182 | struct dst_entry *dst; | |
183 | struct dst_entry *dst_null = &net->ipv6.ip6_null_entry->dst; | |
184 | ||
185 | dst = ip6_route_output(net, NULL, &fl6); | |
186 | if (dst == dst_null) | |
187 | goto err; | |
188 | ||
189 | skb_dst_drop(skb); | |
b4869aa2 DA |
190 | |
191 | /* if dst.dev is loopback or the VRF device again this is locally | |
192 | * originated traffic destined to a local address. Short circuit | |
4f04256c | 193 | * to Rx path |
b4869aa2 | 194 | */ |
4f04256c DA |
195 | if (dst->dev == dev) |
196 | return vrf_local_xmit(skb, dev, dst); | |
b4869aa2 | 197 | |
35402e31 DA |
198 | skb_dst_set(skb, dst); |
199 | ||
911a66fb DA |
200 | /* strip the ethernet header added for pass through VRF device */ |
201 | __skb_pull(skb, skb_network_offset(skb)); | |
202 | ||
4c1feac5 | 203 | ret = vrf_ip6_local_out(net, skb->sk, skb); |
35402e31 DA |
204 | if (unlikely(net_xmit_eval(ret))) |
205 | dev->stats.tx_errors++; | |
206 | else | |
207 | ret = NET_XMIT_SUCCESS; | |
208 | ||
209 | return ret; | |
210 | err: | |
211 | vrf_tx_error(dev, skb); | |
212 | return NET_XMIT_DROP; | |
213 | } | |
214 | #else | |
193125db DA |
215 | static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb, |
216 | struct net_device *dev) | |
217 | { | |
57b8efa1 NA |
218 | vrf_tx_error(dev, skb); |
219 | return NET_XMIT_DROP; | |
193125db | 220 | } |
35402e31 | 221 | #endif |
193125db | 222 | |
ebfc102c DA |
223 | /* based on ip_local_out; can't use it b/c the dst is switched pointing to us */ |
224 | static int vrf_ip_local_out(struct net *net, struct sock *sk, | |
225 | struct sk_buff *skb) | |
226 | { | |
227 | int err; | |
228 | ||
229 | err = nf_hook(NFPROTO_IPV4, NF_INET_LOCAL_OUT, net, sk, | |
230 | skb, NULL, skb_dst(skb)->dev, dst_output); | |
231 | if (likely(err == 1)) | |
232 | err = dst_output(net, sk, skb); | |
233 | ||
234 | return err; | |
235 | } | |
236 | ||
193125db DA |
237 | static netdev_tx_t vrf_process_v4_outbound(struct sk_buff *skb, |
238 | struct net_device *vrf_dev) | |
239 | { | |
240 | struct iphdr *ip4h = ip_hdr(skb); | |
241 | int ret = NET_XMIT_DROP; | |
242 | struct flowi4 fl4 = { | |
243 | /* needed to match OIF rule */ | |
244 | .flowi4_oif = vrf_dev->ifindex, | |
245 | .flowi4_iif = LOOPBACK_IFINDEX, | |
246 | .flowi4_tos = RT_TOS(ip4h->tos), | |
c71ad3d4 | 247 | .flowi4_flags = FLOWI_FLAG_ANYSRC | FLOWI_FLAG_SKIP_NH_OIF, |
7a18c5b9 | 248 | .flowi4_proto = ip4h->protocol, |
193125db | 249 | .daddr = ip4h->daddr, |
7a18c5b9 | 250 | .saddr = ip4h->saddr, |
193125db | 251 | }; |
911a66fb DA |
252 | struct net *net = dev_net(vrf_dev); |
253 | struct rtable *rt; | |
254 | ||
255 | rt = ip_route_output_flow(net, &fl4, NULL); | |
256 | if (IS_ERR(rt)) | |
257 | goto err; | |
193125db | 258 | |
911a66fb | 259 | skb_dst_drop(skb); |
afe80a49 DA |
260 | |
261 | /* if dst.dev is loopback or the VRF device again this is locally | |
262 | * originated traffic destined to a local address. Short circuit | |
4f04256c | 263 | * to Rx path |
afe80a49 | 264 | */ |
4f04256c DA |
265 | if (rt->dst.dev == vrf_dev) |
266 | return vrf_local_xmit(skb, vrf_dev, &rt->dst); | |
afe80a49 | 267 | |
911a66fb DA |
268 | skb_dst_set(skb, &rt->dst); |
269 | ||
270 | /* strip the ethernet header added for pass through VRF device */ | |
271 | __skb_pull(skb, skb_network_offset(skb)); | |
193125db DA |
272 | |
273 | if (!ip4h->saddr) { | |
274 | ip4h->saddr = inet_select_addr(skb_dst(skb)->dev, 0, | |
275 | RT_SCOPE_LINK); | |
276 | } | |
277 | ||
ebfc102c | 278 | ret = vrf_ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb); |
193125db DA |
279 | if (unlikely(net_xmit_eval(ret))) |
280 | vrf_dev->stats.tx_errors++; | |
281 | else | |
282 | ret = NET_XMIT_SUCCESS; | |
283 | ||
284 | out: | |
285 | return ret; | |
286 | err: | |
57b8efa1 | 287 | vrf_tx_error(vrf_dev, skb); |
193125db DA |
288 | goto out; |
289 | } | |
290 | ||
291 | static netdev_tx_t is_ip_tx_frame(struct sk_buff *skb, struct net_device *dev) | |
292 | { | |
293 | switch (skb->protocol) { | |
294 | case htons(ETH_P_IP): | |
295 | return vrf_process_v4_outbound(skb, dev); | |
296 | case htons(ETH_P_IPV6): | |
297 | return vrf_process_v6_outbound(skb, dev); | |
298 | default: | |
57b8efa1 | 299 | vrf_tx_error(dev, skb); |
193125db DA |
300 | return NET_XMIT_DROP; |
301 | } | |
302 | } | |
303 | ||
304 | static netdev_tx_t vrf_xmit(struct sk_buff *skb, struct net_device *dev) | |
305 | { | |
f7887d40 | 306 | int len = skb->len; |
193125db DA |
307 | netdev_tx_t ret = is_ip_tx_frame(skb, dev); |
308 | ||
309 | if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { | |
310 | struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats); | |
311 | ||
312 | u64_stats_update_begin(&dstats->syncp); | |
313 | dstats->tx_pkts++; | |
f7887d40 | 314 | dstats->tx_bytes += len; |
193125db DA |
315 | u64_stats_update_end(&dstats->syncp); |
316 | } else { | |
317 | this_cpu_inc(dev->dstats->tx_drps); | |
318 | } | |
319 | ||
320 | return ret; | |
321 | } | |
322 | ||
dcdd43c4 DA |
323 | static int vrf_finish_direct(struct net *net, struct sock *sk, |
324 | struct sk_buff *skb) | |
325 | { | |
326 | struct net_device *vrf_dev = skb->dev; | |
327 | ||
328 | if (!list_empty(&vrf_dev->ptype_all) && | |
329 | likely(skb_headroom(skb) >= ETH_HLEN)) { | |
d58ff351 | 330 | struct ethhdr *eth = skb_push(skb, ETH_HLEN); |
dcdd43c4 DA |
331 | |
332 | ether_addr_copy(eth->h_source, vrf_dev->dev_addr); | |
333 | eth_zero_addr(eth->h_dest); | |
334 | eth->h_proto = skb->protocol; | |
335 | ||
336 | rcu_read_lock_bh(); | |
337 | dev_queue_xmit_nit(skb, vrf_dev); | |
338 | rcu_read_unlock_bh(); | |
339 | ||
340 | skb_pull(skb, ETH_HLEN); | |
341 | } | |
342 | ||
343 | return 1; | |
344 | } | |
345 | ||
35402e31 | 346 | #if IS_ENABLED(CONFIG_IPV6) |
35402e31 DA |
347 | /* modelled after ip6_finish_output2 */ |
348 | static int vrf_finish_output6(struct net *net, struct sock *sk, | |
349 | struct sk_buff *skb) | |
350 | { | |
351 | struct dst_entry *dst = skb_dst(skb); | |
352 | struct net_device *dev = dst->dev; | |
353 | struct neighbour *neigh; | |
354 | struct in6_addr *nexthop; | |
355 | int ret; | |
356 | ||
eb63ecc1 DA |
357 | nf_reset(skb); |
358 | ||
35402e31 DA |
359 | skb->protocol = htons(ETH_P_IPV6); |
360 | skb->dev = dev; | |
361 | ||
362 | rcu_read_lock_bh(); | |
363 | nexthop = rt6_nexthop((struct rt6_info *)dst, &ipv6_hdr(skb)->daddr); | |
364 | neigh = __ipv6_neigh_lookup_noref(dst->dev, nexthop); | |
365 | if (unlikely(!neigh)) | |
366 | neigh = __neigh_create(&nd_tbl, nexthop, dst->dev, false); | |
367 | if (!IS_ERR(neigh)) { | |
4ff06203 | 368 | sock_confirm_neigh(skb, neigh); |
0353f282 | 369 | ret = neigh_output(neigh, skb, false); |
35402e31 DA |
370 | rcu_read_unlock_bh(); |
371 | return ret; | |
372 | } | |
373 | rcu_read_unlock_bh(); | |
374 | ||
375 | IP6_INC_STATS(dev_net(dst->dev), | |
376 | ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES); | |
377 | kfree_skb(skb); | |
378 | return -EINVAL; | |
379 | } | |
380 | ||
381 | /* modelled after ip6_output */ | |
382 | static int vrf_output6(struct net *net, struct sock *sk, struct sk_buff *skb) | |
383 | { | |
384 | return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING, | |
385 | net, sk, skb, NULL, skb_dst(skb)->dev, | |
386 | vrf_finish_output6, | |
387 | !(IP6CB(skb)->flags & IP6SKB_REROUTED)); | |
388 | } | |
389 | ||
4c1feac5 DA |
390 | /* set dst on skb to send packet to us via dev_xmit path. Allows |
391 | * packet to go through device based features such as qdisc, netfilter | |
392 | * hooks and packet sockets with skb->dev set to vrf device. | |
393 | */ | |
a9ec54d1 DA |
394 | static struct sk_buff *vrf_ip6_out_redirect(struct net_device *vrf_dev, |
395 | struct sk_buff *skb) | |
4c1feac5 DA |
396 | { |
397 | struct net_vrf *vrf = netdev_priv(vrf_dev); | |
398 | struct dst_entry *dst = NULL; | |
399 | struct rt6_info *rt6; | |
400 | ||
4c1feac5 DA |
401 | rcu_read_lock(); |
402 | ||
403 | rt6 = rcu_dereference(vrf->rt6); | |
404 | if (likely(rt6)) { | |
405 | dst = &rt6->dst; | |
406 | dst_hold(dst); | |
407 | } | |
408 | ||
409 | rcu_read_unlock(); | |
410 | ||
411 | if (unlikely(!dst)) { | |
412 | vrf_tx_error(vrf_dev, skb); | |
413 | return NULL; | |
414 | } | |
415 | ||
416 | skb_dst_drop(skb); | |
417 | skb_dst_set(skb, dst); | |
418 | ||
419 | return skb; | |
420 | } | |
421 | ||
a9ec54d1 DA |
422 | static int vrf_output6_direct(struct net *net, struct sock *sk, |
423 | struct sk_buff *skb) | |
424 | { | |
425 | skb->protocol = htons(ETH_P_IPV6); | |
426 | ||
427 | return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING, | |
428 | net, sk, skb, NULL, skb->dev, | |
429 | vrf_finish_direct, | |
430 | !(IPCB(skb)->flags & IPSKB_REROUTED)); | |
431 | } | |
432 | ||
433 | static struct sk_buff *vrf_ip6_out_direct(struct net_device *vrf_dev, | |
434 | struct sock *sk, | |
435 | struct sk_buff *skb) | |
436 | { | |
437 | struct net *net = dev_net(vrf_dev); | |
438 | int err; | |
439 | ||
440 | skb->dev = vrf_dev; | |
441 | ||
442 | err = nf_hook(NFPROTO_IPV6, NF_INET_LOCAL_OUT, net, sk, | |
443 | skb, NULL, vrf_dev, vrf_output6_direct); | |
444 | ||
445 | if (likely(err == 1)) | |
446 | err = vrf_output6_direct(net, sk, skb); | |
447 | ||
448 | /* reset skb device */ | |
449 | if (likely(err == 1)) | |
450 | nf_reset(skb); | |
451 | else | |
452 | skb = NULL; | |
453 | ||
454 | return skb; | |
455 | } | |
456 | ||
457 | static struct sk_buff *vrf_ip6_out(struct net_device *vrf_dev, | |
458 | struct sock *sk, | |
459 | struct sk_buff *skb) | |
460 | { | |
461 | /* don't divert link scope packets */ | |
462 | if (rt6_need_strict(&ipv6_hdr(skb)->daddr)) | |
463 | return skb; | |
464 | ||
465 | if (qdisc_tx_is_default(vrf_dev)) | |
466 | return vrf_ip6_out_direct(vrf_dev, sk, skb); | |
467 | ||
468 | return vrf_ip6_out_redirect(vrf_dev, skb); | |
469 | } | |
470 | ||
b0e95ccd | 471 | /* holding rtnl */ |
810e530b | 472 | static void vrf_rt6_release(struct net_device *dev, struct net_vrf *vrf) |
35402e31 | 473 | { |
b0e95ccd | 474 | struct rt6_info *rt6 = rtnl_dereference(vrf->rt6); |
810e530b DA |
475 | struct net *net = dev_net(dev); |
476 | struct dst_entry *dst; | |
b0e95ccd | 477 | |
b4869aa2 | 478 | RCU_INIT_POINTER(vrf->rt6, NULL); |
b4869aa2 | 479 | synchronize_rcu(); |
b0e95ccd | 480 | |
810e530b DA |
481 | /* move dev in dst's to loopback so this VRF device can be deleted |
482 | * - based on dst_ifdown | |
483 | */ | |
484 | if (rt6) { | |
485 | dst = &rt6->dst; | |
486 | dev_put(dst->dev); | |
487 | dst->dev = net->loopback_dev; | |
488 | dev_hold(dst->dev); | |
489 | dst_release(dst); | |
490 | } | |
35402e31 DA |
491 | } |
492 | ||
493 | static int vrf_rt6_create(struct net_device *dev) | |
494 | { | |
a4c2fd7f | 495 | int flags = DST_HOST | DST_NOPOLICY | DST_NOXFRM; |
35402e31 | 496 | struct net_vrf *vrf = netdev_priv(dev); |
9ab179d8 | 497 | struct net *net = dev_net(dev); |
4f04256c | 498 | struct rt6_info *rt6; |
35402e31 DA |
499 | int rc = -ENOMEM; |
500 | ||
e4348637 DA |
501 | /* IPv6 can be CONFIG enabled and then disabled runtime */ |
502 | if (!ipv6_mod_enabled()) | |
503 | return 0; | |
504 | ||
43b059a3 DA |
505 | vrf->fib6_table = fib6_new_table(net, vrf->tb_id); |
506 | if (!vrf->fib6_table) | |
b3b4663c DA |
507 | goto out; |
508 | ||
b4869aa2 DA |
509 | /* create a dst for routing packets out a VRF device */ |
510 | rt6 = ip6_dst_alloc(net, dev, flags); | |
35402e31 DA |
511 | if (!rt6) |
512 | goto out; | |
513 | ||
b3b4663c | 514 | rt6->dst.output = vrf_output6; |
b4869aa2 | 515 | |
b0e95ccd DA |
516 | rcu_assign_pointer(vrf->rt6, rt6); |
517 | ||
35402e31 DA |
518 | rc = 0; |
519 | out: | |
520 | return rc; | |
521 | } | |
522 | #else | |
4c1feac5 DA |
523 | static struct sk_buff *vrf_ip6_out(struct net_device *vrf_dev, |
524 | struct sock *sk, | |
525 | struct sk_buff *skb) | |
526 | { | |
527 | return skb; | |
528 | } | |
529 | ||
810e530b | 530 | static void vrf_rt6_release(struct net_device *dev, struct net_vrf *vrf) |
35402e31 DA |
531 | { |
532 | } | |
533 | ||
534 | static int vrf_rt6_create(struct net_device *dev) | |
535 | { | |
536 | return 0; | |
537 | } | |
538 | #endif | |
539 | ||
8f58336d | 540 | /* modelled after ip_finish_output2 */ |
0c4b51f0 | 541 | static int vrf_finish_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
193125db | 542 | { |
8f58336d DA |
543 | struct dst_entry *dst = skb_dst(skb); |
544 | struct rtable *rt = (struct rtable *)dst; | |
545 | struct net_device *dev = dst->dev; | |
546 | unsigned int hh_len = LL_RESERVED_SPACE(dev); | |
547 | struct neighbour *neigh; | |
5c9f7c1d | 548 | bool is_v6gw = false; |
8f58336d DA |
549 | int ret = -EINVAL; |
550 | ||
eb63ecc1 DA |
551 | nf_reset(skb); |
552 | ||
8f58336d DA |
553 | /* Be paranoid, rather than too clever. */ |
554 | if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) { | |
555 | struct sk_buff *skb2; | |
556 | ||
557 | skb2 = skb_realloc_headroom(skb, LL_RESERVED_SPACE(dev)); | |
558 | if (!skb2) { | |
559 | ret = -ENOMEM; | |
560 | goto err; | |
561 | } | |
562 | if (skb->sk) | |
563 | skb_set_owner_w(skb2, skb->sk); | |
564 | ||
565 | consume_skb(skb); | |
566 | skb = skb2; | |
567 | } | |
568 | ||
569 | rcu_read_lock_bh(); | |
570 | ||
5c9f7c1d | 571 | neigh = ip_neigh_for_gw(rt, skb, &is_v6gw); |
4ff06203 JA |
572 | if (!IS_ERR(neigh)) { |
573 | sock_confirm_neigh(skb, neigh); | |
5c9f7c1d DA |
574 | /* if crossing protocols, can not use the cached header */ |
575 | ret = neigh_output(neigh, skb, is_v6gw); | |
82dd0d2a DA |
576 | rcu_read_unlock_bh(); |
577 | return ret; | |
4ff06203 | 578 | } |
8f58336d DA |
579 | |
580 | rcu_read_unlock_bh(); | |
581 | err: | |
82dd0d2a | 582 | vrf_tx_error(skb->dev, skb); |
8f58336d | 583 | return ret; |
193125db DA |
584 | } |
585 | ||
ede2059d | 586 | static int vrf_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
193125db DA |
587 | { |
588 | struct net_device *dev = skb_dst(skb)->dev; | |
589 | ||
29a26a56 | 590 | IP_UPD_PO_STATS(net, IPSTATS_MIB_OUT, skb->len); |
193125db DA |
591 | |
592 | skb->dev = dev; | |
593 | skb->protocol = htons(ETH_P_IP); | |
594 | ||
29a26a56 EB |
595 | return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING, |
596 | net, sk, skb, NULL, dev, | |
8f58336d | 597 | vrf_finish_output, |
193125db DA |
598 | !(IPCB(skb)->flags & IPSKB_REROUTED)); |
599 | } | |
600 | ||
ebfc102c DA |
601 | /* set dst on skb to send packet to us via dev_xmit path. Allows |
602 | * packet to go through device based features such as qdisc, netfilter | |
603 | * hooks and packet sockets with skb->dev set to vrf device. | |
604 | */ | |
dcdd43c4 DA |
605 | static struct sk_buff *vrf_ip_out_redirect(struct net_device *vrf_dev, |
606 | struct sk_buff *skb) | |
ebfc102c DA |
607 | { |
608 | struct net_vrf *vrf = netdev_priv(vrf_dev); | |
609 | struct dst_entry *dst = NULL; | |
610 | struct rtable *rth; | |
611 | ||
612 | rcu_read_lock(); | |
613 | ||
614 | rth = rcu_dereference(vrf->rth); | |
615 | if (likely(rth)) { | |
616 | dst = &rth->dst; | |
617 | dst_hold(dst); | |
618 | } | |
619 | ||
620 | rcu_read_unlock(); | |
621 | ||
622 | if (unlikely(!dst)) { | |
623 | vrf_tx_error(vrf_dev, skb); | |
624 | return NULL; | |
625 | } | |
626 | ||
627 | skb_dst_drop(skb); | |
628 | skb_dst_set(skb, dst); | |
629 | ||
630 | return skb; | |
631 | } | |
632 | ||
dcdd43c4 DA |
633 | static int vrf_output_direct(struct net *net, struct sock *sk, |
634 | struct sk_buff *skb) | |
635 | { | |
636 | skb->protocol = htons(ETH_P_IP); | |
637 | ||
638 | return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING, | |
639 | net, sk, skb, NULL, skb->dev, | |
640 | vrf_finish_direct, | |
641 | !(IPCB(skb)->flags & IPSKB_REROUTED)); | |
642 | } | |
643 | ||
644 | static struct sk_buff *vrf_ip_out_direct(struct net_device *vrf_dev, | |
645 | struct sock *sk, | |
646 | struct sk_buff *skb) | |
647 | { | |
648 | struct net *net = dev_net(vrf_dev); | |
649 | int err; | |
650 | ||
651 | skb->dev = vrf_dev; | |
652 | ||
653 | err = nf_hook(NFPROTO_IPV4, NF_INET_LOCAL_OUT, net, sk, | |
654 | skb, NULL, vrf_dev, vrf_output_direct); | |
655 | ||
656 | if (likely(err == 1)) | |
657 | err = vrf_output_direct(net, sk, skb); | |
658 | ||
659 | /* reset skb device */ | |
660 | if (likely(err == 1)) | |
661 | nf_reset(skb); | |
662 | else | |
663 | skb = NULL; | |
664 | ||
665 | return skb; | |
666 | } | |
667 | ||
668 | static struct sk_buff *vrf_ip_out(struct net_device *vrf_dev, | |
669 | struct sock *sk, | |
670 | struct sk_buff *skb) | |
671 | { | |
1e19c4d6 DA |
672 | /* don't divert multicast or local broadcast */ |
673 | if (ipv4_is_multicast(ip_hdr(skb)->daddr) || | |
674 | ipv4_is_lbcast(ip_hdr(skb)->daddr)) | |
dcdd43c4 DA |
675 | return skb; |
676 | ||
677 | if (qdisc_tx_is_default(vrf_dev)) | |
678 | return vrf_ip_out_direct(vrf_dev, sk, skb); | |
679 | ||
680 | return vrf_ip_out_redirect(vrf_dev, skb); | |
681 | } | |
682 | ||
ebfc102c DA |
683 | /* called with rcu lock held */ |
684 | static struct sk_buff *vrf_l3_out(struct net_device *vrf_dev, | |
685 | struct sock *sk, | |
686 | struct sk_buff *skb, | |
687 | u16 proto) | |
688 | { | |
689 | switch (proto) { | |
690 | case AF_INET: | |
691 | return vrf_ip_out(vrf_dev, sk, skb); | |
4c1feac5 DA |
692 | case AF_INET6: |
693 | return vrf_ip6_out(vrf_dev, sk, skb); | |
ebfc102c DA |
694 | } |
695 | ||
696 | return skb; | |
697 | } | |
698 | ||
b0e95ccd | 699 | /* holding rtnl */ |
810e530b | 700 | static void vrf_rtable_release(struct net_device *dev, struct net_vrf *vrf) |
193125db | 701 | { |
b0e95ccd | 702 | struct rtable *rth = rtnl_dereference(vrf->rth); |
810e530b DA |
703 | struct net *net = dev_net(dev); |
704 | struct dst_entry *dst; | |
b0e95ccd | 705 | |
afe80a49 | 706 | RCU_INIT_POINTER(vrf->rth, NULL); |
afe80a49 | 707 | synchronize_rcu(); |
193125db | 708 | |
810e530b DA |
709 | /* move dev in dst's to loopback so this VRF device can be deleted |
710 | * - based on dst_ifdown | |
711 | */ | |
712 | if (rth) { | |
713 | dst = &rth->dst; | |
714 | dev_put(dst->dev); | |
715 | dst->dev = net->loopback_dev; | |
716 | dev_hold(dst->dev); | |
717 | dst_release(dst); | |
718 | } | |
193125db DA |
719 | } |
720 | ||
b0e95ccd | 721 | static int vrf_rtable_create(struct net_device *dev) |
193125db | 722 | { |
b7503e0c | 723 | struct net_vrf *vrf = netdev_priv(dev); |
4f04256c | 724 | struct rtable *rth; |
193125db | 725 | |
b3b4663c | 726 | if (!fib_new_table(dev_net(dev), vrf->tb_id)) |
b0e95ccd | 727 | return -ENOMEM; |
b3b4663c | 728 | |
afe80a49 | 729 | /* create a dst for routing packets out through a VRF device */ |
9ab179d8 | 730 | rth = rt_dst_alloc(dev, 0, RTN_UNICAST, 1, 1, 0); |
b0e95ccd DA |
731 | if (!rth) |
732 | return -ENOMEM; | |
193125db | 733 | |
b0e95ccd | 734 | rth->dst.output = vrf_output; |
b0e95ccd DA |
735 | |
736 | rcu_assign_pointer(vrf->rth, rth); | |
737 | ||
738 | return 0; | |
193125db DA |
739 | } |
740 | ||
741 | /**************************** device handling ********************/ | |
742 | ||
743 | /* cycle interface to flush neighbor cache and move routes across tables */ | |
dc1aea1e PM |
744 | static void cycle_netdev(struct net_device *dev, |
745 | struct netlink_ext_ack *extack) | |
193125db DA |
746 | { |
747 | unsigned int flags = dev->flags; | |
748 | int ret; | |
749 | ||
750 | if (!netif_running(dev)) | |
751 | return; | |
752 | ||
567c5e13 | 753 | ret = dev_change_flags(dev, flags & ~IFF_UP, extack); |
193125db | 754 | if (ret >= 0) |
567c5e13 | 755 | ret = dev_change_flags(dev, flags, extack); |
193125db DA |
756 | |
757 | if (ret < 0) { | |
758 | netdev_err(dev, | |
759 | "Failed to cycle device %s; route tables might be wrong!\n", | |
760 | dev->name); | |
761 | } | |
762 | } | |
763 | ||
42ab19ee DA |
764 | static int do_vrf_add_slave(struct net_device *dev, struct net_device *port_dev, |
765 | struct netlink_ext_ack *extack) | |
193125db | 766 | { |
bad53162 | 767 | int ret; |
193125db | 768 | |
26d31ac1 DA |
769 | /* do not allow loopback device to be enslaved to a VRF. |
770 | * The vrf device acts as the loopback for the vrf. | |
771 | */ | |
de3baa3e DA |
772 | if (port_dev == dev_net(dev)->loopback_dev) { |
773 | NL_SET_ERR_MSG(extack, | |
774 | "Can not enslave loopback device to a VRF"); | |
26d31ac1 | 775 | return -EOPNOTSUPP; |
de3baa3e | 776 | } |
26d31ac1 | 777 | |
fdeea7be | 778 | port_dev->priv_flags |= IFF_L3MDEV_SLAVE; |
42ab19ee | 779 | ret = netdev_master_upper_dev_link(port_dev, dev, NULL, NULL, extack); |
193125db | 780 | if (ret < 0) |
fdeea7be | 781 | goto err; |
193125db | 782 | |
dc1aea1e | 783 | cycle_netdev(port_dev, extack); |
193125db DA |
784 | |
785 | return 0; | |
fdeea7be IS |
786 | |
787 | err: | |
788 | port_dev->priv_flags &= ~IFF_L3MDEV_SLAVE; | |
789 | return ret; | |
193125db DA |
790 | } |
791 | ||
33eaf2a6 DA |
792 | static int vrf_add_slave(struct net_device *dev, struct net_device *port_dev, |
793 | struct netlink_ext_ack *extack) | |
193125db | 794 | { |
de3baa3e DA |
795 | if (netif_is_l3_master(port_dev)) { |
796 | NL_SET_ERR_MSG(extack, | |
797 | "Can not enslave an L3 master device to a VRF"); | |
798 | return -EINVAL; | |
799 | } | |
800 | ||
801 | if (netif_is_l3_slave(port_dev)) | |
193125db DA |
802 | return -EINVAL; |
803 | ||
42ab19ee | 804 | return do_vrf_add_slave(dev, port_dev, extack); |
193125db DA |
805 | } |
806 | ||
807 | /* inverse of do_vrf_add_slave */ | |
808 | static int do_vrf_del_slave(struct net_device *dev, struct net_device *port_dev) | |
809 | { | |
193125db | 810 | netdev_upper_dev_unlink(port_dev, dev); |
fee6d4c7 | 811 | port_dev->priv_flags &= ~IFF_L3MDEV_SLAVE; |
193125db | 812 | |
dc1aea1e | 813 | cycle_netdev(port_dev, NULL); |
193125db | 814 | |
193125db DA |
815 | return 0; |
816 | } | |
817 | ||
818 | static int vrf_del_slave(struct net_device *dev, struct net_device *port_dev) | |
819 | { | |
193125db DA |
820 | return do_vrf_del_slave(dev, port_dev); |
821 | } | |
822 | ||
823 | static void vrf_dev_uninit(struct net_device *dev) | |
824 | { | |
825 | struct net_vrf *vrf = netdev_priv(dev); | |
193125db | 826 | |
810e530b DA |
827 | vrf_rtable_release(dev, vrf); |
828 | vrf_rt6_release(dev, vrf); | |
193125db | 829 | |
3a4a27d3 | 830 | free_percpu(dev->dstats); |
193125db DA |
831 | dev->dstats = NULL; |
832 | } | |
833 | ||
834 | static int vrf_dev_init(struct net_device *dev) | |
835 | { | |
836 | struct net_vrf *vrf = netdev_priv(dev); | |
837 | ||
193125db DA |
838 | dev->dstats = netdev_alloc_pcpu_stats(struct pcpu_dstats); |
839 | if (!dev->dstats) | |
840 | goto out_nomem; | |
841 | ||
842 | /* create the default dst which points back to us */ | |
b0e95ccd | 843 | if (vrf_rtable_create(dev) != 0) |
193125db DA |
844 | goto out_stats; |
845 | ||
35402e31 DA |
846 | if (vrf_rt6_create(dev) != 0) |
847 | goto out_rth; | |
848 | ||
193125db DA |
849 | dev->flags = IFF_MASTER | IFF_NOARP; |
850 | ||
b87ab6b8 DA |
851 | /* MTU is irrelevant for VRF device; set to 64k similar to lo */ |
852 | dev->mtu = 64 * 1024; | |
853 | ||
854 | /* similarly, oper state is irrelevant; set to up to avoid confusion */ | |
855 | dev->operstate = IF_OPER_UP; | |
78e7a2ae | 856 | netdev_lockdep_set_classes(dev); |
193125db DA |
857 | return 0; |
858 | ||
35402e31 | 859 | out_rth: |
810e530b | 860 | vrf_rtable_release(dev, vrf); |
193125db DA |
861 | out_stats: |
862 | free_percpu(dev->dstats); | |
863 | dev->dstats = NULL; | |
864 | out_nomem: | |
865 | return -ENOMEM; | |
866 | } | |
867 | ||
868 | static const struct net_device_ops vrf_netdev_ops = { | |
869 | .ndo_init = vrf_dev_init, | |
870 | .ndo_uninit = vrf_dev_uninit, | |
871 | .ndo_start_xmit = vrf_xmit, | |
6819e3f6 | 872 | .ndo_set_mac_address = eth_mac_addr, |
193125db DA |
873 | .ndo_get_stats64 = vrf_get_stats64, |
874 | .ndo_add_slave = vrf_add_slave, | |
875 | .ndo_del_slave = vrf_del_slave, | |
876 | }; | |
877 | ||
ee15ee5d DA |
878 | static u32 vrf_fib_table(const struct net_device *dev) |
879 | { | |
880 | struct net_vrf *vrf = netdev_priv(dev); | |
881 | ||
882 | return vrf->tb_id; | |
883 | } | |
884 | ||
73e20b76 DA |
885 | static int vrf_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb) |
886 | { | |
1a4a5bf5 | 887 | kfree_skb(skb); |
73e20b76 DA |
888 | return 0; |
889 | } | |
890 | ||
891 | static struct sk_buff *vrf_rcv_nfhook(u8 pf, unsigned int hook, | |
892 | struct sk_buff *skb, | |
893 | struct net_device *dev) | |
894 | { | |
895 | struct net *net = dev_net(dev); | |
896 | ||
1a4a5bf5 | 897 | if (nf_hook(pf, hook, net, NULL, skb, dev, NULL, vrf_rcv_finish) != 1) |
73e20b76 DA |
898 | skb = NULL; /* kfree_skb(skb) handled by nf code */ |
899 | ||
900 | return skb; | |
901 | } | |
902 | ||
74b20582 DA |
903 | #if IS_ENABLED(CONFIG_IPV6) |
904 | /* neighbor handling is done with actual device; do not want | |
905 | * to flip skb->dev for those ndisc packets. This really fails | |
906 | * for multiple next protocols (e.g., NEXTHDR_HOP). But it is | |
907 | * a start. | |
908 | */ | |
909 | static bool ipv6_ndisc_frame(const struct sk_buff *skb) | |
910 | { | |
911 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
912 | bool rc = false; | |
913 | ||
914 | if (iph->nexthdr == NEXTHDR_ICMP) { | |
915 | const struct icmp6hdr *icmph; | |
916 | struct icmp6hdr _icmph; | |
917 | ||
918 | icmph = skb_header_pointer(skb, sizeof(*iph), | |
919 | sizeof(_icmph), &_icmph); | |
920 | if (!icmph) | |
921 | goto out; | |
922 | ||
923 | switch (icmph->icmp6_type) { | |
924 | case NDISC_ROUTER_SOLICITATION: | |
925 | case NDISC_ROUTER_ADVERTISEMENT: | |
926 | case NDISC_NEIGHBOUR_SOLICITATION: | |
927 | case NDISC_NEIGHBOUR_ADVERTISEMENT: | |
928 | case NDISC_REDIRECT: | |
929 | rc = true; | |
930 | break; | |
931 | } | |
932 | } | |
933 | ||
934 | out: | |
935 | return rc; | |
936 | } | |
937 | ||
9ff74384 DA |
938 | static struct rt6_info *vrf_ip6_route_lookup(struct net *net, |
939 | const struct net_device *dev, | |
940 | struct flowi6 *fl6, | |
941 | int ifindex, | |
b75cc8f9 | 942 | const struct sk_buff *skb, |
9ff74384 DA |
943 | int flags) |
944 | { | |
945 | struct net_vrf *vrf = netdev_priv(dev); | |
9ff74384 | 946 | |
43b059a3 | 947 | return ip6_pol_route(net, vrf->fib6_table, ifindex, fl6, skb, flags); |
9ff74384 DA |
948 | } |
949 | ||
950 | static void vrf_ip6_input_dst(struct sk_buff *skb, struct net_device *vrf_dev, | |
951 | int ifindex) | |
952 | { | |
953 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
954 | struct flowi6 fl6 = { | |
ecf09117 AB |
955 | .flowi6_iif = ifindex, |
956 | .flowi6_mark = skb->mark, | |
957 | .flowi6_proto = iph->nexthdr, | |
9ff74384 DA |
958 | .daddr = iph->daddr, |
959 | .saddr = iph->saddr, | |
960 | .flowlabel = ip6_flowinfo(iph), | |
9ff74384 DA |
961 | }; |
962 | struct net *net = dev_net(vrf_dev); | |
963 | struct rt6_info *rt6; | |
964 | ||
b75cc8f9 | 965 | rt6 = vrf_ip6_route_lookup(net, vrf_dev, &fl6, ifindex, skb, |
9ff74384 DA |
966 | RT6_LOOKUP_F_HAS_SADDR | RT6_LOOKUP_F_IFACE); |
967 | if (unlikely(!rt6)) | |
968 | return; | |
969 | ||
970 | if (unlikely(&rt6->dst == &net->ipv6.ip6_null_entry->dst)) | |
971 | return; | |
972 | ||
973 | skb_dst_set(skb, &rt6->dst); | |
974 | } | |
975 | ||
74b20582 DA |
976 | static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev, |
977 | struct sk_buff *skb) | |
978 | { | |
9ff74384 | 979 | int orig_iif = skb->skb_iif; |
6f12fa77 MM |
980 | bool need_strict = rt6_need_strict(&ipv6_hdr(skb)->daddr); |
981 | bool is_ndisc = ipv6_ndisc_frame(skb); | |
9ff74384 | 982 | |
6f12fa77 MM |
983 | /* loopback, multicast & non-ND link-local traffic; do not push through |
984 | * packet taps again. Reset pkt_type for upper layers to process skb | |
b4869aa2 | 985 | */ |
6f12fa77 | 986 | if (skb->pkt_type == PACKET_LOOPBACK || (need_strict && !is_ndisc)) { |
b4869aa2 DA |
987 | skb->dev = vrf_dev; |
988 | skb->skb_iif = vrf_dev->ifindex; | |
a04a480d | 989 | IP6CB(skb)->flags |= IP6SKB_L3SLAVE; |
6f12fa77 MM |
990 | if (skb->pkt_type == PACKET_LOOPBACK) |
991 | skb->pkt_type = PACKET_HOST; | |
b4869aa2 DA |
992 | goto out; |
993 | } | |
994 | ||
6f12fa77 MM |
995 | /* if packet is NDISC then keep the ingress interface */ |
996 | if (!is_ndisc) { | |
926d93a3 | 997 | vrf_rx_stats(vrf_dev, skb->len); |
74b20582 DA |
998 | skb->dev = vrf_dev; |
999 | skb->skb_iif = vrf_dev->ifindex; | |
1000 | ||
a9ec54d1 DA |
1001 | if (!list_empty(&vrf_dev->ptype_all)) { |
1002 | skb_push(skb, skb->mac_len); | |
1003 | dev_queue_xmit_nit(skb, vrf_dev); | |
1004 | skb_pull(skb, skb->mac_len); | |
1005 | } | |
74b20582 DA |
1006 | |
1007 | IP6CB(skb)->flags |= IP6SKB_L3SLAVE; | |
1008 | } | |
1009 | ||
9ff74384 DA |
1010 | if (need_strict) |
1011 | vrf_ip6_input_dst(skb, vrf_dev, orig_iif); | |
1012 | ||
73e20b76 | 1013 | skb = vrf_rcv_nfhook(NFPROTO_IPV6, NF_INET_PRE_ROUTING, skb, vrf_dev); |
b4869aa2 | 1014 | out: |
74b20582 DA |
1015 | return skb; |
1016 | } | |
1017 | ||
1018 | #else | |
1019 | static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev, | |
1020 | struct sk_buff *skb) | |
1021 | { | |
1022 | return skb; | |
1023 | } | |
1024 | #endif | |
1025 | ||
1026 | static struct sk_buff *vrf_ip_rcv(struct net_device *vrf_dev, | |
1027 | struct sk_buff *skb) | |
1028 | { | |
1029 | skb->dev = vrf_dev; | |
1030 | skb->skb_iif = vrf_dev->ifindex; | |
a04a480d | 1031 | IPCB(skb)->flags |= IPSKB_L3SLAVE; |
74b20582 | 1032 | |
e58e4159 DA |
1033 | if (ipv4_is_multicast(ip_hdr(skb)->daddr)) |
1034 | goto out; | |
1035 | ||
afe80a49 DA |
1036 | /* loopback traffic; do not push through packet taps again. |
1037 | * Reset pkt_type for upper layers to process skb | |
1038 | */ | |
1039 | if (skb->pkt_type == PACKET_LOOPBACK) { | |
1040 | skb->pkt_type = PACKET_HOST; | |
1041 | goto out; | |
1042 | } | |
1043 | ||
926d93a3 DA |
1044 | vrf_rx_stats(vrf_dev, skb->len); |
1045 | ||
dcdd43c4 DA |
1046 | if (!list_empty(&vrf_dev->ptype_all)) { |
1047 | skb_push(skb, skb->mac_len); | |
1048 | dev_queue_xmit_nit(skb, vrf_dev); | |
1049 | skb_pull(skb, skb->mac_len); | |
1050 | } | |
74b20582 | 1051 | |
73e20b76 | 1052 | skb = vrf_rcv_nfhook(NFPROTO_IPV4, NF_INET_PRE_ROUTING, skb, vrf_dev); |
afe80a49 | 1053 | out: |
74b20582 DA |
1054 | return skb; |
1055 | } | |
1056 | ||
1057 | /* called with rcu lock held */ | |
1058 | static struct sk_buff *vrf_l3_rcv(struct net_device *vrf_dev, | |
1059 | struct sk_buff *skb, | |
1060 | u16 proto) | |
1061 | { | |
1062 | switch (proto) { | |
1063 | case AF_INET: | |
1064 | return vrf_ip_rcv(vrf_dev, skb); | |
1065 | case AF_INET6: | |
1066 | return vrf_ip6_rcv(vrf_dev, skb); | |
1067 | } | |
1068 | ||
1069 | return skb; | |
1070 | } | |
1071 | ||
35402e31 | 1072 | #if IS_ENABLED(CONFIG_IPV6) |
4c1feac5 DA |
1073 | /* send to link-local or multicast address via interface enslaved to |
1074 | * VRF device. Force lookup to VRF table without changing flow struct | |
1075 | */ | |
1076 | static struct dst_entry *vrf_link_scope_lookup(const struct net_device *dev, | |
1077 | struct flowi6 *fl6) | |
35402e31 | 1078 | { |
9ff74384 | 1079 | struct net *net = dev_net(dev); |
4c1feac5 | 1080 | int flags = RT6_LOOKUP_F_IFACE; |
b0e95ccd | 1081 | struct dst_entry *dst = NULL; |
9ff74384 | 1082 | struct rt6_info *rt; |
35402e31 | 1083 | |
4c1feac5 DA |
1084 | /* VRF device does not have a link-local address and |
1085 | * sending packets to link-local or mcast addresses over | |
1086 | * a VRF device does not make sense | |
1087 | */ | |
1088 | if (fl6->flowi6_oif == dev->ifindex) { | |
1089 | dst = &net->ipv6.ip6_null_entry->dst; | |
1090 | dst_hold(dst); | |
1091 | return dst; | |
35402e31 DA |
1092 | } |
1093 | ||
4c1feac5 DA |
1094 | if (!ipv6_addr_any(&fl6->saddr)) |
1095 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
1096 | ||
b75cc8f9 | 1097 | rt = vrf_ip6_route_lookup(net, dev, fl6, fl6->flowi6_oif, NULL, flags); |
4c1feac5 DA |
1098 | if (rt) |
1099 | dst = &rt->dst; | |
9ff74384 | 1100 | |
b0e95ccd | 1101 | return dst; |
35402e31 DA |
1102 | } |
1103 | #endif | |
1104 | ||
ee15ee5d DA |
1105 | static const struct l3mdev_ops vrf_l3mdev_ops = { |
1106 | .l3mdev_fib_table = vrf_fib_table, | |
74b20582 | 1107 | .l3mdev_l3_rcv = vrf_l3_rcv, |
ebfc102c | 1108 | .l3mdev_l3_out = vrf_l3_out, |
35402e31 | 1109 | #if IS_ENABLED(CONFIG_IPV6) |
4c1feac5 | 1110 | .l3mdev_link_scope_lookup = vrf_link_scope_lookup, |
35402e31 | 1111 | #endif |
ee15ee5d DA |
1112 | }; |
1113 | ||
193125db DA |
1114 | static void vrf_get_drvinfo(struct net_device *dev, |
1115 | struct ethtool_drvinfo *info) | |
1116 | { | |
1117 | strlcpy(info->driver, DRV_NAME, sizeof(info->driver)); | |
1118 | strlcpy(info->version, DRV_VERSION, sizeof(info->version)); | |
1119 | } | |
1120 | ||
1121 | static const struct ethtool_ops vrf_ethtool_ops = { | |
1122 | .get_drvinfo = vrf_get_drvinfo, | |
1123 | }; | |
1124 | ||
1aa6c4f6 DA |
1125 | static inline size_t vrf_fib_rule_nl_size(void) |
1126 | { | |
1127 | size_t sz; | |
1128 | ||
1129 | sz = NLMSG_ALIGN(sizeof(struct fib_rule_hdr)); | |
1130 | sz += nla_total_size(sizeof(u8)); /* FRA_L3MDEV */ | |
1131 | sz += nla_total_size(sizeof(u32)); /* FRA_PRIORITY */ | |
1b71af60 | 1132 | sz += nla_total_size(sizeof(u8)); /* FRA_PROTOCOL */ |
1aa6c4f6 DA |
1133 | |
1134 | return sz; | |
1135 | } | |
1136 | ||
1137 | static int vrf_fib_rule(const struct net_device *dev, __u8 family, bool add_it) | |
1138 | { | |
1139 | struct fib_rule_hdr *frh; | |
1140 | struct nlmsghdr *nlh; | |
1141 | struct sk_buff *skb; | |
1142 | int err; | |
1143 | ||
e4348637 DA |
1144 | if (family == AF_INET6 && !ipv6_mod_enabled()) |
1145 | return 0; | |
1146 | ||
1aa6c4f6 DA |
1147 | skb = nlmsg_new(vrf_fib_rule_nl_size(), GFP_KERNEL); |
1148 | if (!skb) | |
1149 | return -ENOMEM; | |
1150 | ||
1151 | nlh = nlmsg_put(skb, 0, 0, 0, sizeof(*frh), 0); | |
1152 | if (!nlh) | |
1153 | goto nla_put_failure; | |
1154 | ||
1155 | /* rule only needs to appear once */ | |
426c87ca | 1156 | nlh->nlmsg_flags |= NLM_F_EXCL; |
1aa6c4f6 DA |
1157 | |
1158 | frh = nlmsg_data(nlh); | |
1159 | memset(frh, 0, sizeof(*frh)); | |
1160 | frh->family = family; | |
1161 | frh->action = FR_ACT_TO_TBL; | |
1b71af60 DS |
1162 | |
1163 | if (nla_put_u8(skb, FRA_PROTOCOL, RTPROT_KERNEL)) | |
1164 | goto nla_put_failure; | |
1aa6c4f6 | 1165 | |
18129a24 | 1166 | if (nla_put_u8(skb, FRA_L3MDEV, 1)) |
1aa6c4f6 DA |
1167 | goto nla_put_failure; |
1168 | ||
1169 | if (nla_put_u32(skb, FRA_PRIORITY, FIB_RULE_PREF)) | |
1170 | goto nla_put_failure; | |
1171 | ||
1172 | nlmsg_end(skb, nlh); | |
1173 | ||
1174 | /* fib_nl_{new,del}rule handling looks for net from skb->sk */ | |
1175 | skb->sk = dev_net(dev)->rtnl; | |
1176 | if (add_it) { | |
c21ef3e3 | 1177 | err = fib_nl_newrule(skb, nlh, NULL); |
1aa6c4f6 DA |
1178 | if (err == -EEXIST) |
1179 | err = 0; | |
1180 | } else { | |
c21ef3e3 | 1181 | err = fib_nl_delrule(skb, nlh, NULL); |
1aa6c4f6 DA |
1182 | if (err == -ENOENT) |
1183 | err = 0; | |
1184 | } | |
1185 | nlmsg_free(skb); | |
1186 | ||
1187 | return err; | |
1188 | ||
1189 | nla_put_failure: | |
1190 | nlmsg_free(skb); | |
1191 | ||
1192 | return -EMSGSIZE; | |
1193 | } | |
1194 | ||
1195 | static int vrf_add_fib_rules(const struct net_device *dev) | |
1196 | { | |
1197 | int err; | |
1198 | ||
1199 | err = vrf_fib_rule(dev, AF_INET, true); | |
1200 | if (err < 0) | |
1201 | goto out_err; | |
1202 | ||
1203 | err = vrf_fib_rule(dev, AF_INET6, true); | |
1204 | if (err < 0) | |
1205 | goto ipv6_err; | |
1206 | ||
e58e4159 DA |
1207 | #if IS_ENABLED(CONFIG_IP_MROUTE_MULTIPLE_TABLES) |
1208 | err = vrf_fib_rule(dev, RTNL_FAMILY_IPMR, true); | |
1209 | if (err < 0) | |
1210 | goto ipmr_err; | |
1211 | #endif | |
1212 | ||
e4a38c0c PR |
1213 | #if IS_ENABLED(CONFIG_IPV6_MROUTE_MULTIPLE_TABLES) |
1214 | err = vrf_fib_rule(dev, RTNL_FAMILY_IP6MR, true); | |
1215 | if (err < 0) | |
1216 | goto ip6mr_err; | |
1217 | #endif | |
1218 | ||
1aa6c4f6 DA |
1219 | return 0; |
1220 | ||
e4a38c0c PR |
1221 | #if IS_ENABLED(CONFIG_IPV6_MROUTE_MULTIPLE_TABLES) |
1222 | ip6mr_err: | |
1223 | vrf_fib_rule(dev, RTNL_FAMILY_IPMR, false); | |
1224 | #endif | |
1225 | ||
e58e4159 DA |
1226 | #if IS_ENABLED(CONFIG_IP_MROUTE_MULTIPLE_TABLES) |
1227 | ipmr_err: | |
1228 | vrf_fib_rule(dev, AF_INET6, false); | |
1229 | #endif | |
1230 | ||
1aa6c4f6 DA |
1231 | ipv6_err: |
1232 | vrf_fib_rule(dev, AF_INET, false); | |
1233 | ||
1234 | out_err: | |
1235 | netdev_err(dev, "Failed to add FIB rules.\n"); | |
1236 | return err; | |
1237 | } | |
1238 | ||
193125db DA |
1239 | static void vrf_setup(struct net_device *dev) |
1240 | { | |
1241 | ether_setup(dev); | |
1242 | ||
1243 | /* Initialize the device structure. */ | |
1244 | dev->netdev_ops = &vrf_netdev_ops; | |
ee15ee5d | 1245 | dev->l3mdev_ops = &vrf_l3mdev_ops; |
193125db | 1246 | dev->ethtool_ops = &vrf_ethtool_ops; |
cf124db5 | 1247 | dev->needs_free_netdev = true; |
193125db DA |
1248 | |
1249 | /* Fill in device structure with ethernet-generic values. */ | |
1250 | eth_hw_addr_random(dev); | |
1251 | ||
1252 | /* don't acquire vrf device's netif_tx_lock when transmitting */ | |
1253 | dev->features |= NETIF_F_LLTX; | |
1254 | ||
1255 | /* don't allow vrf devices to change network namespaces. */ | |
1256 | dev->features |= NETIF_F_NETNS_LOCAL; | |
7889681f DA |
1257 | |
1258 | /* does not make sense for a VLAN to be added to a vrf device */ | |
1259 | dev->features |= NETIF_F_VLAN_CHALLENGED; | |
1260 | ||
1261 | /* enable offload features */ | |
1262 | dev->features |= NETIF_F_GSO_SOFTWARE; | |
cb160394 | 1263 | dev->features |= NETIF_F_RXCSUM | NETIF_F_HW_CSUM | NETIF_F_SCTP_CRC; |
7889681f DA |
1264 | dev->features |= NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA; |
1265 | ||
1266 | dev->hw_features = dev->features; | |
1267 | dev->hw_enc_features = dev->features; | |
1268 | ||
1269 | /* default to no qdisc; user can add if desired */ | |
1270 | dev->priv_flags |= IFF_NO_QUEUE; | |
1017e098 | 1271 | dev->priv_flags |= IFF_NO_RX_HANDLER; |
6819e3f6 | 1272 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
ad49bc63 | 1273 | |
5055376a ML |
1274 | /* VRF devices do not care about MTU, but if the MTU is set |
1275 | * too low then the ipv4 and ipv6 protocols are disabled | |
1276 | * which breaks networking. | |
1277 | */ | |
1278 | dev->min_mtu = IPV6_MIN_MTU; | |
1279 | dev->max_mtu = ETH_MAX_MTU; | |
193125db DA |
1280 | } |
1281 | ||
a8b8a889 MS |
1282 | static int vrf_validate(struct nlattr *tb[], struct nlattr *data[], |
1283 | struct netlink_ext_ack *extack) | |
193125db DA |
1284 | { |
1285 | if (tb[IFLA_ADDRESS]) { | |
53b94835 DA |
1286 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) { |
1287 | NL_SET_ERR_MSG(extack, "Invalid hardware address"); | |
193125db | 1288 | return -EINVAL; |
53b94835 DA |
1289 | } |
1290 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) { | |
1291 | NL_SET_ERR_MSG(extack, "Invalid hardware address"); | |
193125db | 1292 | return -EADDRNOTAVAIL; |
53b94835 | 1293 | } |
193125db DA |
1294 | } |
1295 | return 0; | |
1296 | } | |
1297 | ||
1298 | static void vrf_dellink(struct net_device *dev, struct list_head *head) | |
1299 | { | |
f630c38e NA |
1300 | struct net_device *port_dev; |
1301 | struct list_head *iter; | |
1302 | ||
1303 | netdev_for_each_lower_dev(dev, port_dev, iter) | |
1304 | vrf_del_slave(dev, port_dev); | |
1305 | ||
193125db DA |
1306 | unregister_netdevice_queue(dev, head); |
1307 | } | |
1308 | ||
1309 | static int vrf_newlink(struct net *src_net, struct net_device *dev, | |
7a3f4a18 MS |
1310 | struct nlattr *tb[], struct nlattr *data[], |
1311 | struct netlink_ext_ack *extack) | |
193125db DA |
1312 | { |
1313 | struct net_vrf *vrf = netdev_priv(dev); | |
097d3c95 DA |
1314 | bool *add_fib_rules; |
1315 | struct net *net; | |
1aa6c4f6 | 1316 | int err; |
193125db | 1317 | |
53b94835 DA |
1318 | if (!data || !data[IFLA_VRF_TABLE]) { |
1319 | NL_SET_ERR_MSG(extack, "VRF table id is missing"); | |
193125db | 1320 | return -EINVAL; |
53b94835 | 1321 | } |
193125db DA |
1322 | |
1323 | vrf->tb_id = nla_get_u32(data[IFLA_VRF_TABLE]); | |
53b94835 DA |
1324 | if (vrf->tb_id == RT_TABLE_UNSPEC) { |
1325 | NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VRF_TABLE], | |
1326 | "Invalid VRF table id"); | |
24c63bbc | 1327 | return -EINVAL; |
53b94835 | 1328 | } |
193125db | 1329 | |
007979ea | 1330 | dev->priv_flags |= IFF_L3MDEV_MASTER; |
193125db | 1331 | |
1aa6c4f6 DA |
1332 | err = register_netdevice(dev); |
1333 | if (err) | |
1334 | goto out; | |
1335 | ||
097d3c95 DA |
1336 | net = dev_net(dev); |
1337 | add_fib_rules = net_generic(net, vrf_net_id); | |
1338 | if (*add_fib_rules) { | |
1aa6c4f6 DA |
1339 | err = vrf_add_fib_rules(dev); |
1340 | if (err) { | |
1341 | unregister_netdevice(dev); | |
1342 | goto out; | |
1343 | } | |
097d3c95 | 1344 | *add_fib_rules = false; |
1aa6c4f6 DA |
1345 | } |
1346 | ||
1347 | out: | |
1348 | return err; | |
193125db DA |
1349 | } |
1350 | ||
1351 | static size_t vrf_nl_getsize(const struct net_device *dev) | |
1352 | { | |
1353 | return nla_total_size(sizeof(u32)); /* IFLA_VRF_TABLE */ | |
1354 | } | |
1355 | ||
1356 | static int vrf_fillinfo(struct sk_buff *skb, | |
1357 | const struct net_device *dev) | |
1358 | { | |
1359 | struct net_vrf *vrf = netdev_priv(dev); | |
1360 | ||
1361 | return nla_put_u32(skb, IFLA_VRF_TABLE, vrf->tb_id); | |
1362 | } | |
1363 | ||
67eb0331 DA |
1364 | static size_t vrf_get_slave_size(const struct net_device *bond_dev, |
1365 | const struct net_device *slave_dev) | |
1366 | { | |
1367 | return nla_total_size(sizeof(u32)); /* IFLA_VRF_PORT_TABLE */ | |
1368 | } | |
1369 | ||
1370 | static int vrf_fill_slave_info(struct sk_buff *skb, | |
1371 | const struct net_device *vrf_dev, | |
1372 | const struct net_device *slave_dev) | |
1373 | { | |
1374 | struct net_vrf *vrf = netdev_priv(vrf_dev); | |
1375 | ||
1376 | if (nla_put_u32(skb, IFLA_VRF_PORT_TABLE, vrf->tb_id)) | |
1377 | return -EMSGSIZE; | |
1378 | ||
1379 | return 0; | |
1380 | } | |
1381 | ||
193125db DA |
1382 | static const struct nla_policy vrf_nl_policy[IFLA_VRF_MAX + 1] = { |
1383 | [IFLA_VRF_TABLE] = { .type = NLA_U32 }, | |
1384 | }; | |
1385 | ||
1386 | static struct rtnl_link_ops vrf_link_ops __read_mostly = { | |
1387 | .kind = DRV_NAME, | |
1388 | .priv_size = sizeof(struct net_vrf), | |
1389 | ||
1390 | .get_size = vrf_nl_getsize, | |
1391 | .policy = vrf_nl_policy, | |
1392 | .validate = vrf_validate, | |
1393 | .fill_info = vrf_fillinfo, | |
1394 | ||
67eb0331 DA |
1395 | .get_slave_size = vrf_get_slave_size, |
1396 | .fill_slave_info = vrf_fill_slave_info, | |
1397 | ||
193125db DA |
1398 | .newlink = vrf_newlink, |
1399 | .dellink = vrf_dellink, | |
1400 | .setup = vrf_setup, | |
1401 | .maxtype = IFLA_VRF_MAX, | |
1402 | }; | |
1403 | ||
1404 | static int vrf_device_event(struct notifier_block *unused, | |
1405 | unsigned long event, void *ptr) | |
1406 | { | |
1407 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
1408 | ||
1409 | /* only care about unregister events to drop slave references */ | |
1410 | if (event == NETDEV_UNREGISTER) { | |
193125db DA |
1411 | struct net_device *vrf_dev; |
1412 | ||
fee6d4c7 | 1413 | if (!netif_is_l3_slave(dev)) |
193125db DA |
1414 | goto out; |
1415 | ||
58aa9087 NA |
1416 | vrf_dev = netdev_master_upper_dev_get(dev); |
1417 | vrf_del_slave(vrf_dev, dev); | |
193125db DA |
1418 | } |
1419 | out: | |
1420 | return NOTIFY_DONE; | |
1421 | } | |
1422 | ||
1423 | static struct notifier_block vrf_notifier_block __read_mostly = { | |
1424 | .notifier_call = vrf_device_event, | |
1425 | }; | |
1426 | ||
097d3c95 DA |
1427 | /* Initialize per network namespace state */ |
1428 | static int __net_init vrf_netns_init(struct net *net) | |
1429 | { | |
1430 | bool *add_fib_rules = net_generic(net, vrf_net_id); | |
1431 | ||
1432 | *add_fib_rules = true; | |
1433 | ||
1434 | return 0; | |
1435 | } | |
1436 | ||
1437 | static struct pernet_operations vrf_net_ops __net_initdata = { | |
1438 | .init = vrf_netns_init, | |
1439 | .id = &vrf_net_id, | |
1440 | .size = sizeof(bool), | |
1441 | }; | |
1442 | ||
193125db DA |
1443 | static int __init vrf_init_module(void) |
1444 | { | |
1445 | int rc; | |
1446 | ||
193125db DA |
1447 | register_netdevice_notifier(&vrf_notifier_block); |
1448 | ||
097d3c95 | 1449 | rc = register_pernet_subsys(&vrf_net_ops); |
193125db DA |
1450 | if (rc < 0) |
1451 | goto error; | |
1452 | ||
097d3c95 DA |
1453 | rc = rtnl_link_register(&vrf_link_ops); |
1454 | if (rc < 0) { | |
1455 | unregister_pernet_subsys(&vrf_net_ops); | |
1456 | goto error; | |
1457 | } | |
1458 | ||
193125db DA |
1459 | return 0; |
1460 | ||
1461 | error: | |
1462 | unregister_netdevice_notifier(&vrf_notifier_block); | |
193125db DA |
1463 | return rc; |
1464 | } | |
1465 | ||
193125db | 1466 | module_init(vrf_init_module); |
193125db DA |
1467 | MODULE_AUTHOR("Shrijeet Mukherjee, David Ahern"); |
1468 | MODULE_DESCRIPTION("Device driver to instantiate VRF domains"); | |
1469 | MODULE_LICENSE("GPL"); | |
1470 | MODULE_ALIAS_RTNL_LINK(DRV_NAME); | |
1471 | MODULE_VERSION(DRV_VERSION); |