1 | // SPDX-License-Identifier: GPL-2.0-or-later |
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 |
10 | */ |
11 | |
12 | #include <linux/ethtool.h> |
13 | #include <linux/module.h> |
14 | #include <linux/kernel.h> |
15 | #include <linux/netdevice.h> |
16 | #include <linux/etherdevice.h> |
17 | #include <linux/ip.h> |
18 | #include <linux/init.h> |
19 | #include <linux/moduleparam.h> |
20 | #include <linux/netfilter.h> |
21 | #include <linux/rtnetlink.h> |
22 | #include <net/rtnetlink.h> |
23 | #include <linux/u64_stats_sync.h> |
24 | #include <linux/hashtable.h> |
25 | #include <linux/spinlock_types.h> |
26 | |
27 | #include <linux/inetdevice.h> |
28 | #include <net/arp.h> |
29 | #include <net/ip.h> |
30 | #include <net/ip_fib.h> |
31 | #include <net/ip6_fib.h> |
32 | #include <net/ip6_route.h> |
33 | #include <net/route.h> |
34 | #include <net/addrconf.h> |
35 | #include <net/l3mdev.h> |
36 | #include <net/fib_rules.h> |
37 | #include <net/sch_generic.h> |
38 | #include <net/netns/generic.h> |
39 | #include <net/netfilter/nf_conntrack.h> |
40 | |
41 | #define DRV_NAME "vrf" |
42 | #define DRV_VERSION "1.1" |
43 | |
44 | #define FIB_RULE_PREF 1000 /* default preference for FIB rules */ |
45 | |
46 | #define HT_MAP_BITS 4 |
47 | #define HASH_INITVAL ((u32)0xcafef00d) |
48 | |
49 | struct vrf_map { |
50 | DECLARE_HASHTABLE(ht, HT_MAP_BITS); |
51 | spinlock_t vmap_lock; |
52 | |
53 | /* shared_tables: |
54 | * count how many distinct tables do not comply with the strict mode |
55 | * requirement. |
56 | * shared_tables value must be 0 in order to enable the strict mode. |
57 | * |
58 | * example of the evolution of shared_tables: |
59 | * | time |
60 | * add vrf0 --> table 100 shared_tables = 0 | t0 |
61 | * add vrf1 --> table 101 shared_tables = 0 | t1 |
62 | * add vrf2 --> table 100 shared_tables = 1 | t2 |
63 | * add vrf3 --> table 100 shared_tables = 1 | t3 |
64 | * add vrf4 --> table 101 shared_tables = 2 v t4 |
65 | * |
66 | * shared_tables is a "step function" (or "staircase function") |
67 | * and it is increased by one when the second vrf is associated to a |
68 | * table. |
69 | * |
70 | * at t2, vrf0 and vrf2 are bound to table 100: shared_tables = 1. |
71 | * |
72 | * at t3, another dev (vrf3) is bound to the same table 100 but the |
73 | * value of shared_tables is still 1. |
74 | * This means that no matter how many new vrfs will register on the |
75 | * table 100, the shared_tables will not increase (considering only |
76 | * table 100). |
77 | * |
78 | * at t4, vrf4 is bound to table 101, and shared_tables = 2. |
79 | * |
80 | * Looking at the value of shared_tables we can immediately know if |
81 | * the strict_mode can or cannot be enforced. Indeed, strict_mode |
82 | * can be enforced iff shared_tables = 0. |
83 | * |
84 | * Conversely, shared_tables is decreased when a vrf is de-associated |
85 | * from a table with exactly two associated vrfs. |
86 | */ |
87 | u32 shared_tables; |
88 | |
89 | bool strict_mode; |
90 | }; |
91 | |
92 | struct vrf_map_elem { |
93 | struct hlist_node hnode; |
94 | struct list_head vrf_list; /* VRFs registered to this table */ |
95 | |
96 | u32 table_id; |
97 | int users; |
98 | int ifindex; |
99 | }; |
100 | |
101 | static unsigned int vrf_net_id; |
102 | |
103 | /* per netns vrf data */ |
104 | struct netns_vrf { |
105 | /* protected by rtnl lock */ |
106 | bool add_fib_rules; |
107 | |
108 | struct vrf_map vmap; |
109 | struct ctl_table_header *ctl_hdr; |
110 | }; |
111 | |
112 | struct net_vrf { |
113 | struct rtable __rcu *rth; |
114 | struct rt6_info __rcu *rt6; |
115 | #if IS_ENABLED(CONFIG_IPV6) |
116 | struct fib6_table *fib6_table; |
117 | #endif |
118 | u32 tb_id; |
119 | |
120 | struct list_head me_list; /* entry in vrf_map_elem */ |
121 | int ifindex; |
122 | }; |
123 | |
124 | static void vrf_rx_stats(struct net_device *dev, int len) |
125 | { |
126 | struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats); |
127 | |
128 | u64_stats_update_begin(syncp: &dstats->syncp); |
129 | dstats->rx_packets++; |
130 | dstats->rx_bytes += len; |
131 | u64_stats_update_end(syncp: &dstats->syncp); |
132 | } |
133 | |
134 | static void vrf_tx_error(struct net_device *vrf_dev, struct sk_buff *skb) |
135 | { |
136 | vrf_dev->stats.tx_errors++; |
137 | kfree_skb(skb); |
138 | } |
139 | |
140 | static void vrf_get_stats64(struct net_device *dev, |
141 | struct rtnl_link_stats64 *stats) |
142 | { |
143 | int i; |
144 | |
145 | for_each_possible_cpu(i) { |
146 | const struct pcpu_dstats *dstats; |
147 | u64 tbytes, tpkts, tdrops, rbytes, rpkts; |
148 | unsigned int start; |
149 | |
150 | dstats = per_cpu_ptr(dev->dstats, i); |
151 | do { |
152 | start = u64_stats_fetch_begin(syncp: &dstats->syncp); |
153 | tbytes = dstats->tx_bytes; |
154 | tpkts = dstats->tx_packets; |
155 | tdrops = dstats->tx_drops; |
156 | rbytes = dstats->rx_bytes; |
157 | rpkts = dstats->rx_packets; |
158 | } while (u64_stats_fetch_retry(syncp: &dstats->syncp, start)); |
159 | stats->tx_bytes += tbytes; |
160 | stats->tx_packets += tpkts; |
161 | stats->tx_dropped += tdrops; |
162 | stats->rx_bytes += rbytes; |
163 | stats->rx_packets += rpkts; |
164 | } |
165 | } |
166 | |
167 | static struct vrf_map *netns_vrf_map(struct net *net) |
168 | { |
169 | struct netns_vrf *nn_vrf = net_generic(net, id: vrf_net_id); |
170 | |
171 | return &nn_vrf->vmap; |
172 | } |
173 | |
174 | static struct vrf_map *netns_vrf_map_by_dev(struct net_device *dev) |
175 | { |
176 | return netns_vrf_map(net: dev_net(dev)); |
177 | } |
178 | |
179 | static int vrf_map_elem_get_vrf_ifindex(struct vrf_map_elem *me) |
180 | { |
181 | struct list_head *me_head = &me->vrf_list; |
182 | struct net_vrf *vrf; |
183 | |
184 | if (list_empty(head: me_head)) |
185 | return -ENODEV; |
186 | |
187 | vrf = list_first_entry(me_head, struct net_vrf, me_list); |
188 | |
189 | return vrf->ifindex; |
190 | } |
191 | |
192 | static struct vrf_map_elem *vrf_map_elem_alloc(gfp_t flags) |
193 | { |
194 | struct vrf_map_elem *me; |
195 | |
196 | me = kmalloc(size: sizeof(*me), flags); |
197 | if (!me) |
198 | return NULL; |
199 | |
200 | return me; |
201 | } |
202 | |
203 | static void vrf_map_elem_free(struct vrf_map_elem *me) |
204 | { |
205 | kfree(objp: me); |
206 | } |
207 | |
208 | static void vrf_map_elem_init(struct vrf_map_elem *me, int table_id, |
209 | int ifindex, int users) |
210 | { |
211 | me->table_id = table_id; |
212 | me->ifindex = ifindex; |
213 | me->users = users; |
214 | INIT_LIST_HEAD(list: &me->vrf_list); |
215 | } |
216 | |
217 | static struct vrf_map_elem *vrf_map_lookup_elem(struct vrf_map *vmap, |
218 | u32 table_id) |
219 | { |
220 | struct vrf_map_elem *me; |
221 | u32 key; |
222 | |
223 | key = jhash_1word(a: table_id, HASH_INITVAL); |
224 | hash_for_each_possible(vmap->ht, me, hnode, key) { |
225 | if (me->table_id == table_id) |
226 | return me; |
227 | } |
228 | |
229 | return NULL; |
230 | } |
231 | |
232 | static void vrf_map_add_elem(struct vrf_map *vmap, struct vrf_map_elem *me) |
233 | { |
234 | u32 table_id = me->table_id; |
235 | u32 key; |
236 | |
237 | key = jhash_1word(a: table_id, HASH_INITVAL); |
238 | hash_add(vmap->ht, &me->hnode, key); |
239 | } |
240 | |
241 | static void vrf_map_del_elem(struct vrf_map_elem *me) |
242 | { |
243 | hash_del(node: &me->hnode); |
244 | } |
245 | |
246 | static void vrf_map_lock(struct vrf_map *vmap) __acquires(&vmap->vmap_lock) |
247 | { |
248 | spin_lock(lock: &vmap->vmap_lock); |
249 | } |
250 | |
251 | static void vrf_map_unlock(struct vrf_map *vmap) __releases(&vmap->vmap_lock) |
252 | { |
253 | spin_unlock(lock: &vmap->vmap_lock); |
254 | } |
255 | |
256 | /* called with rtnl lock held */ |
257 | static int |
258 | vrf_map_register_dev(struct net_device *dev, struct netlink_ext_ack *extack) |
259 | { |
260 | struct vrf_map *vmap = netns_vrf_map_by_dev(dev); |
261 | struct net_vrf *vrf = netdev_priv(dev); |
262 | struct vrf_map_elem *new_me, *me; |
263 | u32 table_id = vrf->tb_id; |
264 | bool free_new_me = false; |
265 | int users; |
266 | int res; |
267 | |
268 | /* we pre-allocate elements used in the spin-locked section (so that we |
269 | * keep the spinlock as short as possible). |
270 | */ |
271 | new_me = vrf_map_elem_alloc(GFP_KERNEL); |
272 | if (!new_me) |
273 | return -ENOMEM; |
274 | |
275 | vrf_map_elem_init(me: new_me, table_id, ifindex: dev->ifindex, users: 0); |
276 | |
277 | vrf_map_lock(vmap); |
278 | |
279 | me = vrf_map_lookup_elem(vmap, table_id); |
280 | if (!me) { |
281 | me = new_me; |
282 | vrf_map_add_elem(vmap, me); |
283 | goto link_vrf; |
284 | } |
285 | |
286 | /* we already have an entry in the vrf_map, so it means there is (at |
287 | * least) a vrf registered on the specific table. |
288 | */ |
289 | free_new_me = true; |
290 | if (vmap->strict_mode) { |
291 | /* vrfs cannot share the same table */ |
292 | NL_SET_ERR_MSG(extack, "Table is used by another VRF" ); |
293 | res = -EBUSY; |
294 | goto unlock; |
295 | } |
296 | |
297 | link_vrf: |
298 | users = ++me->users; |
299 | if (users == 2) |
300 | ++vmap->shared_tables; |
301 | |
302 | list_add(new: &vrf->me_list, head: &me->vrf_list); |
303 | |
304 | res = 0; |
305 | |
306 | unlock: |
307 | vrf_map_unlock(vmap); |
308 | |
309 | /* clean-up, if needed */ |
310 | if (free_new_me) |
311 | vrf_map_elem_free(me: new_me); |
312 | |
313 | return res; |
314 | } |
315 | |
316 | /* called with rtnl lock held */ |
317 | static void vrf_map_unregister_dev(struct net_device *dev) |
318 | { |
319 | struct vrf_map *vmap = netns_vrf_map_by_dev(dev); |
320 | struct net_vrf *vrf = netdev_priv(dev); |
321 | u32 table_id = vrf->tb_id; |
322 | struct vrf_map_elem *me; |
323 | int users; |
324 | |
325 | vrf_map_lock(vmap); |
326 | |
327 | me = vrf_map_lookup_elem(vmap, table_id); |
328 | if (!me) |
329 | goto unlock; |
330 | |
331 | list_del(entry: &vrf->me_list); |
332 | |
333 | users = --me->users; |
334 | if (users == 1) { |
335 | --vmap->shared_tables; |
336 | } else if (users == 0) { |
337 | vrf_map_del_elem(me); |
338 | |
339 | /* no one will refer to this element anymore */ |
340 | vrf_map_elem_free(me); |
341 | } |
342 | |
343 | unlock: |
344 | vrf_map_unlock(vmap); |
345 | } |
346 | |
347 | /* return the vrf device index associated with the table_id */ |
348 | static int vrf_ifindex_lookup_by_table_id(struct net *net, u32 table_id) |
349 | { |
350 | struct vrf_map *vmap = netns_vrf_map(net); |
351 | struct vrf_map_elem *me; |
352 | int ifindex; |
353 | |
354 | vrf_map_lock(vmap); |
355 | |
356 | if (!vmap->strict_mode) { |
357 | ifindex = -EPERM; |
358 | goto unlock; |
359 | } |
360 | |
361 | me = vrf_map_lookup_elem(vmap, table_id); |
362 | if (!me) { |
363 | ifindex = -ENODEV; |
364 | goto unlock; |
365 | } |
366 | |
367 | ifindex = vrf_map_elem_get_vrf_ifindex(me); |
368 | |
369 | unlock: |
370 | vrf_map_unlock(vmap); |
371 | |
372 | return ifindex; |
373 | } |
374 | |
375 | /* by default VRF devices do not have a qdisc and are expected |
376 | * to be created with only a single queue. |
377 | */ |
378 | static bool qdisc_tx_is_default(const struct net_device *dev) |
379 | { |
380 | struct netdev_queue *txq; |
381 | struct Qdisc *qdisc; |
382 | |
383 | if (dev->num_tx_queues > 1) |
384 | return false; |
385 | |
386 | txq = netdev_get_tx_queue(dev, index: 0); |
387 | qdisc = rcu_access_pointer(txq->qdisc); |
388 | |
389 | return !qdisc->enqueue; |
390 | } |
391 | |
392 | /* Local traffic destined to local address. Reinsert the packet to rx |
393 | * path, similar to loopback handling. |
394 | */ |
395 | static int vrf_local_xmit(struct sk_buff *skb, struct net_device *dev, |
396 | struct dst_entry *dst) |
397 | { |
398 | int len = skb->len; |
399 | |
400 | skb_orphan(skb); |
401 | |
402 | skb_dst_set(skb, dst); |
403 | |
404 | /* set pkt_type to avoid skb hitting packet taps twice - |
405 | * once on Tx and again in Rx processing |
406 | */ |
407 | skb->pkt_type = PACKET_LOOPBACK; |
408 | |
409 | skb->protocol = eth_type_trans(skb, dev); |
410 | |
411 | if (likely(__netif_rx(skb) == NET_RX_SUCCESS)) |
412 | vrf_rx_stats(dev, len); |
413 | else |
414 | this_cpu_inc(dev->dstats->rx_drops); |
415 | |
416 | return NETDEV_TX_OK; |
417 | } |
418 | |
419 | static void vrf_nf_set_untracked(struct sk_buff *skb) |
420 | { |
421 | if (skb_get_nfct(skb) == 0) |
422 | nf_ct_set(skb, NULL, info: IP_CT_UNTRACKED); |
423 | } |
424 | |
425 | static void vrf_nf_reset_ct(struct sk_buff *skb) |
426 | { |
427 | if (skb_get_nfct(skb) == IP_CT_UNTRACKED) |
428 | nf_reset_ct(skb); |
429 | } |
430 | |
431 | #if IS_ENABLED(CONFIG_IPV6) |
432 | static int vrf_ip6_local_out(struct net *net, struct sock *sk, |
433 | struct sk_buff *skb) |
434 | { |
435 | int err; |
436 | |
437 | vrf_nf_reset_ct(skb); |
438 | |
439 | err = nf_hook(pf: NFPROTO_IPV6, hook: NF_INET_LOCAL_OUT, net, |
440 | sk, skb, NULL, outdev: skb_dst(skb)->dev, okfn: dst_output); |
441 | |
442 | if (likely(err == 1)) |
443 | err = dst_output(net, sk, skb); |
444 | |
445 | return err; |
446 | } |
447 | |
448 | static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb, |
449 | struct net_device *dev) |
450 | { |
451 | const struct ipv6hdr *iph; |
452 | struct net *net = dev_net(dev: skb->dev); |
453 | struct flowi6 fl6; |
454 | int ret = NET_XMIT_DROP; |
455 | struct dst_entry *dst; |
456 | struct dst_entry *dst_null = &net->ipv6.ip6_null_entry->dst; |
457 | |
458 | if (!pskb_may_pull(skb, ETH_HLEN + sizeof(struct ipv6hdr))) |
459 | goto err; |
460 | |
461 | iph = ipv6_hdr(skb); |
462 | |
463 | memset(&fl6, 0, sizeof(fl6)); |
464 | /* needed to match OIF rule */ |
465 | fl6.flowi6_l3mdev = dev->ifindex; |
466 | fl6.flowi6_iif = LOOPBACK_IFINDEX; |
467 | fl6.daddr = iph->daddr; |
468 | fl6.saddr = iph->saddr; |
469 | fl6.flowlabel = ip6_flowinfo(hdr: iph); |
470 | fl6.flowi6_mark = skb->mark; |
471 | fl6.flowi6_proto = iph->nexthdr; |
472 | |
473 | dst = ip6_dst_lookup_flow(net, NULL, fl6: &fl6, NULL); |
474 | if (IS_ERR(ptr: dst) || dst == dst_null) |
475 | goto err; |
476 | |
477 | skb_dst_drop(skb); |
478 | |
479 | /* if dst.dev is the VRF device again this is locally originated traffic |
480 | * destined to a local address. Short circuit to Rx path. |
481 | */ |
482 | if (dst->dev == dev) |
483 | return vrf_local_xmit(skb, dev, dst); |
484 | |
485 | skb_dst_set(skb, dst); |
486 | |
487 | /* strip the ethernet header added for pass through VRF device */ |
488 | __skb_pull(skb, len: skb_network_offset(skb)); |
489 | |
490 | memset(IP6CB(skb), 0, sizeof(*IP6CB(skb))); |
491 | ret = vrf_ip6_local_out(net, sk: skb->sk, skb); |
492 | if (unlikely(net_xmit_eval(ret))) |
493 | dev->stats.tx_errors++; |
494 | else |
495 | ret = NET_XMIT_SUCCESS; |
496 | |
497 | return ret; |
498 | err: |
499 | vrf_tx_error(vrf_dev: dev, skb); |
500 | return NET_XMIT_DROP; |
501 | } |
502 | #else |
503 | static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb, |
504 | struct net_device *dev) |
505 | { |
506 | vrf_tx_error(dev, skb); |
507 | return NET_XMIT_DROP; |
508 | } |
509 | #endif |
510 | |
511 | /* based on ip_local_out; can't use it b/c the dst is switched pointing to us */ |
512 | static int vrf_ip_local_out(struct net *net, struct sock *sk, |
513 | struct sk_buff *skb) |
514 | { |
515 | int err; |
516 | |
517 | vrf_nf_reset_ct(skb); |
518 | |
519 | err = nf_hook(pf: NFPROTO_IPV4, hook: NF_INET_LOCAL_OUT, net, sk, |
520 | skb, NULL, outdev: skb_dst(skb)->dev, okfn: dst_output); |
521 | if (likely(err == 1)) |
522 | err = dst_output(net, sk, skb); |
523 | |
524 | return err; |
525 | } |
526 | |
527 | static netdev_tx_t vrf_process_v4_outbound(struct sk_buff *skb, |
528 | struct net_device *vrf_dev) |
529 | { |
530 | struct iphdr *ip4h; |
531 | int ret = NET_XMIT_DROP; |
532 | struct flowi4 fl4; |
533 | struct net *net = dev_net(dev: vrf_dev); |
534 | struct rtable *rt; |
535 | |
536 | if (!pskb_may_pull(skb, ETH_HLEN + sizeof(struct iphdr))) |
537 | goto err; |
538 | |
539 | ip4h = ip_hdr(skb); |
540 | |
541 | memset(&fl4, 0, sizeof(fl4)); |
542 | /* needed to match OIF rule */ |
543 | fl4.flowi4_l3mdev = vrf_dev->ifindex; |
544 | fl4.flowi4_iif = LOOPBACK_IFINDEX; |
545 | fl4.flowi4_tos = RT_TOS(ip4h->tos); |
546 | fl4.flowi4_flags = FLOWI_FLAG_ANYSRC; |
547 | fl4.flowi4_proto = ip4h->protocol; |
548 | fl4.daddr = ip4h->daddr; |
549 | fl4.saddr = ip4h->saddr; |
550 | |
551 | rt = ip_route_output_flow(net, flp: &fl4, NULL); |
552 | if (IS_ERR(ptr: rt)) |
553 | goto err; |
554 | |
555 | skb_dst_drop(skb); |
556 | |
557 | /* if dst.dev is the VRF device again this is locally originated traffic |
558 | * destined to a local address. Short circuit to Rx path. |
559 | */ |
560 | if (rt->dst.dev == vrf_dev) |
561 | return vrf_local_xmit(skb, dev: vrf_dev, dst: &rt->dst); |
562 | |
563 | skb_dst_set(skb, dst: &rt->dst); |
564 | |
565 | /* strip the ethernet header added for pass through VRF device */ |
566 | __skb_pull(skb, len: skb_network_offset(skb)); |
567 | |
568 | if (!ip4h->saddr) { |
569 | ip4h->saddr = inet_select_addr(dev: skb_dst(skb)->dev, dst: 0, |
570 | scope: RT_SCOPE_LINK); |
571 | } |
572 | |
573 | memset(IPCB(skb), 0, sizeof(*IPCB(skb))); |
574 | ret = vrf_ip_local_out(net: dev_net(dev: skb_dst(skb)->dev), sk: skb->sk, skb); |
575 | if (unlikely(net_xmit_eval(ret))) |
576 | vrf_dev->stats.tx_errors++; |
577 | else |
578 | ret = NET_XMIT_SUCCESS; |
579 | |
580 | out: |
581 | return ret; |
582 | err: |
583 | vrf_tx_error(vrf_dev, skb); |
584 | goto out; |
585 | } |
586 | |
587 | static netdev_tx_t is_ip_tx_frame(struct sk_buff *skb, struct net_device *dev) |
588 | { |
589 | switch (skb->protocol) { |
590 | case htons(ETH_P_IP): |
591 | return vrf_process_v4_outbound(skb, vrf_dev: dev); |
592 | case htons(ETH_P_IPV6): |
593 | return vrf_process_v6_outbound(skb, dev); |
594 | default: |
595 | vrf_tx_error(vrf_dev: dev, skb); |
596 | return NET_XMIT_DROP; |
597 | } |
598 | } |
599 | |
600 | static netdev_tx_t vrf_xmit(struct sk_buff *skb, struct net_device *dev) |
601 | { |
602 | int len = skb->len; |
603 | netdev_tx_t ret = is_ip_tx_frame(skb, dev); |
604 | |
605 | if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { |
606 | struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats); |
607 | |
608 | u64_stats_update_begin(syncp: &dstats->syncp); |
609 | dstats->tx_packets++; |
610 | dstats->tx_bytes += len; |
611 | u64_stats_update_end(syncp: &dstats->syncp); |
612 | } else { |
613 | this_cpu_inc(dev->dstats->tx_drops); |
614 | } |
615 | |
616 | return ret; |
617 | } |
618 | |
619 | static void vrf_finish_direct(struct sk_buff *skb) |
620 | { |
621 | struct net_device *vrf_dev = skb->dev; |
622 | |
623 | if (!list_empty(head: &vrf_dev->ptype_all) && |
624 | likely(skb_headroom(skb) >= ETH_HLEN)) { |
625 | struct ethhdr *eth = skb_push(skb, ETH_HLEN); |
626 | |
627 | ether_addr_copy(dst: eth->h_source, src: vrf_dev->dev_addr); |
628 | eth_zero_addr(addr: eth->h_dest); |
629 | eth->h_proto = skb->protocol; |
630 | |
631 | dev_queue_xmit_nit(skb, dev: vrf_dev); |
632 | |
633 | skb_pull(skb, ETH_HLEN); |
634 | } |
635 | |
636 | vrf_nf_reset_ct(skb); |
637 | } |
638 | |
639 | #if IS_ENABLED(CONFIG_IPV6) |
640 | /* modelled after ip6_finish_output2 */ |
641 | static int vrf_finish_output6(struct net *net, struct sock *sk, |
642 | struct sk_buff *skb) |
643 | { |
644 | struct dst_entry *dst = skb_dst(skb); |
645 | struct net_device *dev = dst->dev; |
646 | const struct in6_addr *nexthop; |
647 | struct neighbour *neigh; |
648 | int ret; |
649 | |
650 | vrf_nf_reset_ct(skb); |
651 | |
652 | skb->protocol = htons(ETH_P_IPV6); |
653 | skb->dev = dev; |
654 | |
655 | rcu_read_lock(); |
656 | nexthop = rt6_nexthop(rt: (struct rt6_info *)dst, daddr: &ipv6_hdr(skb)->daddr); |
657 | neigh = __ipv6_neigh_lookup_noref(dev: dst->dev, pkey: nexthop); |
658 | if (unlikely(!neigh)) |
659 | neigh = __neigh_create(tbl: &nd_tbl, pkey: nexthop, dev: dst->dev, want_ref: false); |
660 | if (!IS_ERR(ptr: neigh)) { |
661 | sock_confirm_neigh(skb, n: neigh); |
662 | ret = neigh_output(n: neigh, skb, skip_cache: false); |
663 | rcu_read_unlock(); |
664 | return ret; |
665 | } |
666 | rcu_read_unlock(); |
667 | |
668 | IP6_INC_STATS(dev_net(dst->dev), |
669 | ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES); |
670 | kfree_skb(skb); |
671 | return -EINVAL; |
672 | } |
673 | |
674 | /* modelled after ip6_output */ |
675 | static int vrf_output6(struct net *net, struct sock *sk, struct sk_buff *skb) |
676 | { |
677 | return NF_HOOK_COND(pf: NFPROTO_IPV6, hook: NF_INET_POST_ROUTING, |
678 | net, sk, skb, NULL, out: skb_dst(skb)->dev, |
679 | okfn: vrf_finish_output6, |
680 | cond: !(IP6CB(skb)->flags & IP6SKB_REROUTED)); |
681 | } |
682 | |
683 | /* set dst on skb to send packet to us via dev_xmit path. Allows |
684 | * packet to go through device based features such as qdisc, netfilter |
685 | * hooks and packet sockets with skb->dev set to vrf device. |
686 | */ |
687 | static struct sk_buff *vrf_ip6_out_redirect(struct net_device *vrf_dev, |
688 | struct sk_buff *skb) |
689 | { |
690 | struct net_vrf *vrf = netdev_priv(dev: vrf_dev); |
691 | struct dst_entry *dst = NULL; |
692 | struct rt6_info *rt6; |
693 | |
694 | rcu_read_lock(); |
695 | |
696 | rt6 = rcu_dereference(vrf->rt6); |
697 | if (likely(rt6)) { |
698 | dst = &rt6->dst; |
699 | dst_hold(dst); |
700 | } |
701 | |
702 | rcu_read_unlock(); |
703 | |
704 | if (unlikely(!dst)) { |
705 | vrf_tx_error(vrf_dev, skb); |
706 | return NULL; |
707 | } |
708 | |
709 | skb_dst_drop(skb); |
710 | skb_dst_set(skb, dst); |
711 | |
712 | return skb; |
713 | } |
714 | |
715 | static int vrf_output6_direct_finish(struct net *net, struct sock *sk, |
716 | struct sk_buff *skb) |
717 | { |
718 | vrf_finish_direct(skb); |
719 | |
720 | return vrf_ip6_local_out(net, sk, skb); |
721 | } |
722 | |
723 | static int vrf_output6_direct(struct net *net, struct sock *sk, |
724 | struct sk_buff *skb) |
725 | { |
726 | int err = 1; |
727 | |
728 | skb->protocol = htons(ETH_P_IPV6); |
729 | |
730 | if (!(IPCB(skb)->flags & IPSKB_REROUTED)) |
731 | err = nf_hook(pf: NFPROTO_IPV6, hook: NF_INET_POST_ROUTING, net, sk, skb, |
732 | NULL, outdev: skb->dev, okfn: vrf_output6_direct_finish); |
733 | |
734 | if (likely(err == 1)) |
735 | vrf_finish_direct(skb); |
736 | |
737 | return err; |
738 | } |
739 | |
740 | static int vrf_ip6_out_direct_finish(struct net *net, struct sock *sk, |
741 | struct sk_buff *skb) |
742 | { |
743 | int err; |
744 | |
745 | err = vrf_output6_direct(net, sk, skb); |
746 | if (likely(err == 1)) |
747 | err = vrf_ip6_local_out(net, sk, skb); |
748 | |
749 | return err; |
750 | } |
751 | |
752 | static struct sk_buff *vrf_ip6_out_direct(struct net_device *vrf_dev, |
753 | struct sock *sk, |
754 | struct sk_buff *skb) |
755 | { |
756 | struct net *net = dev_net(dev: vrf_dev); |
757 | int err; |
758 | |
759 | skb->dev = vrf_dev; |
760 | |
761 | err = nf_hook(pf: NFPROTO_IPV6, hook: NF_INET_LOCAL_OUT, net, sk, |
762 | skb, NULL, outdev: vrf_dev, okfn: vrf_ip6_out_direct_finish); |
763 | |
764 | if (likely(err == 1)) |
765 | err = vrf_output6_direct(net, sk, skb); |
766 | |
767 | if (likely(err == 1)) |
768 | return skb; |
769 | |
770 | return NULL; |
771 | } |
772 | |
773 | static struct sk_buff *vrf_ip6_out(struct net_device *vrf_dev, |
774 | struct sock *sk, |
775 | struct sk_buff *skb) |
776 | { |
777 | /* don't divert link scope packets */ |
778 | if (rt6_need_strict(daddr: &ipv6_hdr(skb)->daddr)) |
779 | return skb; |
780 | |
781 | vrf_nf_set_untracked(skb); |
782 | |
783 | if (qdisc_tx_is_default(dev: vrf_dev) || |
784 | IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED) |
785 | return vrf_ip6_out_direct(vrf_dev, sk, skb); |
786 | |
787 | return vrf_ip6_out_redirect(vrf_dev, skb); |
788 | } |
789 | |
790 | /* holding rtnl */ |
791 | static void vrf_rt6_release(struct net_device *dev, struct net_vrf *vrf) |
792 | { |
793 | struct rt6_info *rt6 = rtnl_dereference(vrf->rt6); |
794 | struct net *net = dev_net(dev); |
795 | struct dst_entry *dst; |
796 | |
797 | RCU_INIT_POINTER(vrf->rt6, NULL); |
798 | synchronize_rcu(); |
799 | |
800 | /* move dev in dst's to loopback so this VRF device can be deleted |
801 | * - based on dst_ifdown |
802 | */ |
803 | if (rt6) { |
804 | dst = &rt6->dst; |
805 | netdev_ref_replace(odev: dst->dev, ndev: net->loopback_dev, |
806 | tracker: &dst->dev_tracker, GFP_KERNEL); |
807 | dst->dev = net->loopback_dev; |
808 | dst_release(dst); |
809 | } |
810 | } |
811 | |
812 | static int vrf_rt6_create(struct net_device *dev) |
813 | { |
814 | int flags = DST_NOPOLICY | DST_NOXFRM; |
815 | struct net_vrf *vrf = netdev_priv(dev); |
816 | struct net *net = dev_net(dev); |
817 | struct rt6_info *rt6; |
818 | int rc = -ENOMEM; |
819 | |
820 | /* IPv6 can be CONFIG enabled and then disabled runtime */ |
821 | if (!ipv6_mod_enabled()) |
822 | return 0; |
823 | |
824 | vrf->fib6_table = fib6_new_table(net, id: vrf->tb_id); |
825 | if (!vrf->fib6_table) |
826 | goto out; |
827 | |
828 | /* create a dst for routing packets out a VRF device */ |
829 | rt6 = ip6_dst_alloc(net, dev, flags); |
830 | if (!rt6) |
831 | goto out; |
832 | |
833 | rt6->dst.output = vrf_output6; |
834 | |
835 | rcu_assign_pointer(vrf->rt6, rt6); |
836 | |
837 | rc = 0; |
838 | out: |
839 | return rc; |
840 | } |
841 | #else |
842 | static struct sk_buff *vrf_ip6_out(struct net_device *vrf_dev, |
843 | struct sock *sk, |
844 | struct sk_buff *skb) |
845 | { |
846 | return skb; |
847 | } |
848 | |
849 | static void vrf_rt6_release(struct net_device *dev, struct net_vrf *vrf) |
850 | { |
851 | } |
852 | |
853 | static int vrf_rt6_create(struct net_device *dev) |
854 | { |
855 | return 0; |
856 | } |
857 | #endif |
858 | |
859 | /* modelled after ip_finish_output2 */ |
860 | static int vrf_finish_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
861 | { |
862 | struct dst_entry *dst = skb_dst(skb); |
863 | struct rtable *rt = (struct rtable *)dst; |
864 | struct net_device *dev = dst->dev; |
865 | unsigned int hh_len = LL_RESERVED_SPACE(dev); |
866 | struct neighbour *neigh; |
867 | bool is_v6gw = false; |
868 | |
869 | vrf_nf_reset_ct(skb); |
870 | |
871 | /* Be paranoid, rather than too clever. */ |
872 | if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) { |
873 | skb = skb_expand_head(skb, headroom: hh_len); |
874 | if (!skb) { |
875 | dev->stats.tx_errors++; |
876 | return -ENOMEM; |
877 | } |
878 | } |
879 | |
880 | rcu_read_lock(); |
881 | |
882 | neigh = ip_neigh_for_gw(rt, skb, is_v6gw: &is_v6gw); |
883 | if (!IS_ERR(ptr: neigh)) { |
884 | int ret; |
885 | |
886 | sock_confirm_neigh(skb, n: neigh); |
887 | /* if crossing protocols, can not use the cached header */ |
888 | ret = neigh_output(n: neigh, skb, skip_cache: is_v6gw); |
889 | rcu_read_unlock(); |
890 | return ret; |
891 | } |
892 | |
893 | rcu_read_unlock(); |
894 | vrf_tx_error(vrf_dev: skb->dev, skb); |
895 | return -EINVAL; |
896 | } |
897 | |
898 | static int vrf_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
899 | { |
900 | struct net_device *dev = skb_dst(skb)->dev; |
901 | |
902 | IP_UPD_PO_STATS(net, IPSTATS_MIB_OUT, skb->len); |
903 | |
904 | skb->dev = dev; |
905 | skb->protocol = htons(ETH_P_IP); |
906 | |
907 | return NF_HOOK_COND(pf: NFPROTO_IPV4, hook: NF_INET_POST_ROUTING, |
908 | net, sk, skb, NULL, out: dev, |
909 | okfn: vrf_finish_output, |
910 | cond: !(IPCB(skb)->flags & IPSKB_REROUTED)); |
911 | } |
912 | |
913 | /* set dst on skb to send packet to us via dev_xmit path. Allows |
914 | * packet to go through device based features such as qdisc, netfilter |
915 | * hooks and packet sockets with skb->dev set to vrf device. |
916 | */ |
917 | static struct sk_buff *vrf_ip_out_redirect(struct net_device *vrf_dev, |
918 | struct sk_buff *skb) |
919 | { |
920 | struct net_vrf *vrf = netdev_priv(dev: vrf_dev); |
921 | struct dst_entry *dst = NULL; |
922 | struct rtable *rth; |
923 | |
924 | rcu_read_lock(); |
925 | |
926 | rth = rcu_dereference(vrf->rth); |
927 | if (likely(rth)) { |
928 | dst = &rth->dst; |
929 | dst_hold(dst); |
930 | } |
931 | |
932 | rcu_read_unlock(); |
933 | |
934 | if (unlikely(!dst)) { |
935 | vrf_tx_error(vrf_dev, skb); |
936 | return NULL; |
937 | } |
938 | |
939 | skb_dst_drop(skb); |
940 | skb_dst_set(skb, dst); |
941 | |
942 | return skb; |
943 | } |
944 | |
945 | static int vrf_output_direct_finish(struct net *net, struct sock *sk, |
946 | struct sk_buff *skb) |
947 | { |
948 | vrf_finish_direct(skb); |
949 | |
950 | return vrf_ip_local_out(net, sk, skb); |
951 | } |
952 | |
953 | static int vrf_output_direct(struct net *net, struct sock *sk, |
954 | struct sk_buff *skb) |
955 | { |
956 | int err = 1; |
957 | |
958 | skb->protocol = htons(ETH_P_IP); |
959 | |
960 | if (!(IPCB(skb)->flags & IPSKB_REROUTED)) |
961 | err = nf_hook(pf: NFPROTO_IPV4, hook: NF_INET_POST_ROUTING, net, sk, skb, |
962 | NULL, outdev: skb->dev, okfn: vrf_output_direct_finish); |
963 | |
964 | if (likely(err == 1)) |
965 | vrf_finish_direct(skb); |
966 | |
967 | return err; |
968 | } |
969 | |
970 | static int vrf_ip_out_direct_finish(struct net *net, struct sock *sk, |
971 | struct sk_buff *skb) |
972 | { |
973 | int err; |
974 | |
975 | err = vrf_output_direct(net, sk, skb); |
976 | if (likely(err == 1)) |
977 | err = vrf_ip_local_out(net, sk, skb); |
978 | |
979 | return err; |
980 | } |
981 | |
982 | static struct sk_buff *vrf_ip_out_direct(struct net_device *vrf_dev, |
983 | struct sock *sk, |
984 | struct sk_buff *skb) |
985 | { |
986 | struct net *net = dev_net(dev: vrf_dev); |
987 | int err; |
988 | |
989 | skb->dev = vrf_dev; |
990 | |
991 | err = nf_hook(pf: NFPROTO_IPV4, hook: NF_INET_LOCAL_OUT, net, sk, |
992 | skb, NULL, outdev: vrf_dev, okfn: vrf_ip_out_direct_finish); |
993 | |
994 | if (likely(err == 1)) |
995 | err = vrf_output_direct(net, sk, skb); |
996 | |
997 | if (likely(err == 1)) |
998 | return skb; |
999 | |
1000 | return NULL; |
1001 | } |
1002 | |
1003 | static struct sk_buff *vrf_ip_out(struct net_device *vrf_dev, |
1004 | struct sock *sk, |
1005 | struct sk_buff *skb) |
1006 | { |
1007 | /* don't divert multicast or local broadcast */ |
1008 | if (ipv4_is_multicast(addr: ip_hdr(skb)->daddr) || |
1009 | ipv4_is_lbcast(addr: ip_hdr(skb)->daddr)) |
1010 | return skb; |
1011 | |
1012 | vrf_nf_set_untracked(skb); |
1013 | |
1014 | if (qdisc_tx_is_default(dev: vrf_dev) || |
1015 | IPCB(skb)->flags & IPSKB_XFRM_TRANSFORMED) |
1016 | return vrf_ip_out_direct(vrf_dev, sk, skb); |
1017 | |
1018 | return vrf_ip_out_redirect(vrf_dev, skb); |
1019 | } |
1020 | |
1021 | /* called with rcu lock held */ |
1022 | static struct sk_buff *vrf_l3_out(struct net_device *vrf_dev, |
1023 | struct sock *sk, |
1024 | struct sk_buff *skb, |
1025 | u16 proto) |
1026 | { |
1027 | switch (proto) { |
1028 | case AF_INET: |
1029 | return vrf_ip_out(vrf_dev, sk, skb); |
1030 | case AF_INET6: |
1031 | return vrf_ip6_out(vrf_dev, sk, skb); |
1032 | } |
1033 | |
1034 | return skb; |
1035 | } |
1036 | |
1037 | /* holding rtnl */ |
1038 | static void vrf_rtable_release(struct net_device *dev, struct net_vrf *vrf) |
1039 | { |
1040 | struct rtable *rth = rtnl_dereference(vrf->rth); |
1041 | struct net *net = dev_net(dev); |
1042 | struct dst_entry *dst; |
1043 | |
1044 | RCU_INIT_POINTER(vrf->rth, NULL); |
1045 | synchronize_rcu(); |
1046 | |
1047 | /* move dev in dst's to loopback so this VRF device can be deleted |
1048 | * - based on dst_ifdown |
1049 | */ |
1050 | if (rth) { |
1051 | dst = &rth->dst; |
1052 | netdev_ref_replace(odev: dst->dev, ndev: net->loopback_dev, |
1053 | tracker: &dst->dev_tracker, GFP_KERNEL); |
1054 | dst->dev = net->loopback_dev; |
1055 | dst_release(dst); |
1056 | } |
1057 | } |
1058 | |
1059 | static int vrf_rtable_create(struct net_device *dev) |
1060 | { |
1061 | struct net_vrf *vrf = netdev_priv(dev); |
1062 | struct rtable *rth; |
1063 | |
1064 | if (!fib_new_table(net: dev_net(dev), id: vrf->tb_id)) |
1065 | return -ENOMEM; |
1066 | |
1067 | /* create a dst for routing packets out through a VRF device */ |
1068 | rth = rt_dst_alloc(dev, flags: 0, type: RTN_UNICAST, noxfrm: 1); |
1069 | if (!rth) |
1070 | return -ENOMEM; |
1071 | |
1072 | rth->dst.output = vrf_output; |
1073 | |
1074 | rcu_assign_pointer(vrf->rth, rth); |
1075 | |
1076 | return 0; |
1077 | } |
1078 | |
1079 | /**************************** device handling ********************/ |
1080 | |
1081 | /* cycle interface to flush neighbor cache and move routes across tables */ |
1082 | static void cycle_netdev(struct net_device *dev, |
1083 | struct netlink_ext_ack *extack) |
1084 | { |
1085 | unsigned int flags = dev->flags; |
1086 | int ret; |
1087 | |
1088 | if (!netif_running(dev)) |
1089 | return; |
1090 | |
1091 | ret = dev_change_flags(dev, flags: flags & ~IFF_UP, extack); |
1092 | if (ret >= 0) |
1093 | ret = dev_change_flags(dev, flags, extack); |
1094 | |
1095 | if (ret < 0) { |
1096 | netdev_err(dev, |
1097 | format: "Failed to cycle device %s; route tables might be wrong!\n" , |
1098 | dev->name); |
1099 | } |
1100 | } |
1101 | |
1102 | static int do_vrf_add_slave(struct net_device *dev, struct net_device *port_dev, |
1103 | struct netlink_ext_ack *extack) |
1104 | { |
1105 | int ret; |
1106 | |
1107 | /* do not allow loopback device to be enslaved to a VRF. |
1108 | * The vrf device acts as the loopback for the vrf. |
1109 | */ |
1110 | if (port_dev == dev_net(dev)->loopback_dev) { |
1111 | NL_SET_ERR_MSG(extack, |
1112 | "Can not enslave loopback device to a VRF" ); |
1113 | return -EOPNOTSUPP; |
1114 | } |
1115 | |
1116 | port_dev->priv_flags |= IFF_L3MDEV_SLAVE; |
1117 | ret = netdev_master_upper_dev_link(dev: port_dev, upper_dev: dev, NULL, NULL, extack); |
1118 | if (ret < 0) |
1119 | goto err; |
1120 | |
1121 | cycle_netdev(dev: port_dev, extack); |
1122 | |
1123 | return 0; |
1124 | |
1125 | err: |
1126 | port_dev->priv_flags &= ~IFF_L3MDEV_SLAVE; |
1127 | return ret; |
1128 | } |
1129 | |
1130 | static int vrf_add_slave(struct net_device *dev, struct net_device *port_dev, |
1131 | struct netlink_ext_ack *extack) |
1132 | { |
1133 | if (netif_is_l3_master(dev: port_dev)) { |
1134 | NL_SET_ERR_MSG(extack, |
1135 | "Can not enslave an L3 master device to a VRF" ); |
1136 | return -EINVAL; |
1137 | } |
1138 | |
1139 | if (netif_is_l3_slave(dev: port_dev)) |
1140 | return -EINVAL; |
1141 | |
1142 | return do_vrf_add_slave(dev, port_dev, extack); |
1143 | } |
1144 | |
1145 | /* inverse of do_vrf_add_slave */ |
1146 | static int do_vrf_del_slave(struct net_device *dev, struct net_device *port_dev) |
1147 | { |
1148 | netdev_upper_dev_unlink(dev: port_dev, upper_dev: dev); |
1149 | port_dev->priv_flags &= ~IFF_L3MDEV_SLAVE; |
1150 | |
1151 | cycle_netdev(dev: port_dev, NULL); |
1152 | |
1153 | return 0; |
1154 | } |
1155 | |
1156 | static int vrf_del_slave(struct net_device *dev, struct net_device *port_dev) |
1157 | { |
1158 | return do_vrf_del_slave(dev, port_dev); |
1159 | } |
1160 | |
1161 | static void vrf_dev_uninit(struct net_device *dev) |
1162 | { |
1163 | struct net_vrf *vrf = netdev_priv(dev); |
1164 | |
1165 | vrf_rtable_release(dev, vrf); |
1166 | vrf_rt6_release(dev, vrf); |
1167 | } |
1168 | |
1169 | static int vrf_dev_init(struct net_device *dev) |
1170 | { |
1171 | struct net_vrf *vrf = netdev_priv(dev); |
1172 | |
1173 | /* create the default dst which points back to us */ |
1174 | if (vrf_rtable_create(dev) != 0) |
1175 | goto out_nomem; |
1176 | |
1177 | if (vrf_rt6_create(dev) != 0) |
1178 | goto out_rth; |
1179 | |
1180 | dev->flags = IFF_MASTER | IFF_NOARP; |
1181 | |
1182 | /* similarly, oper state is irrelevant; set to up to avoid confusion */ |
1183 | dev->operstate = IF_OPER_UP; |
1184 | netdev_lockdep_set_classes(dev); |
1185 | return 0; |
1186 | |
1187 | out_rth: |
1188 | vrf_rtable_release(dev, vrf); |
1189 | out_nomem: |
1190 | return -ENOMEM; |
1191 | } |
1192 | |
1193 | static const struct net_device_ops vrf_netdev_ops = { |
1194 | .ndo_init = vrf_dev_init, |
1195 | .ndo_uninit = vrf_dev_uninit, |
1196 | .ndo_start_xmit = vrf_xmit, |
1197 | .ndo_set_mac_address = eth_mac_addr, |
1198 | .ndo_get_stats64 = vrf_get_stats64, |
1199 | .ndo_add_slave = vrf_add_slave, |
1200 | .ndo_del_slave = vrf_del_slave, |
1201 | }; |
1202 | |
1203 | static u32 vrf_fib_table(const struct net_device *dev) |
1204 | { |
1205 | struct net_vrf *vrf = netdev_priv(dev); |
1206 | |
1207 | return vrf->tb_id; |
1208 | } |
1209 | |
1210 | static int vrf_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb) |
1211 | { |
1212 | kfree_skb(skb); |
1213 | return 0; |
1214 | } |
1215 | |
1216 | static struct sk_buff *vrf_rcv_nfhook(u8 pf, unsigned int hook, |
1217 | struct sk_buff *skb, |
1218 | struct net_device *dev) |
1219 | { |
1220 | struct net *net = dev_net(dev); |
1221 | |
1222 | if (nf_hook(pf, hook, net, NULL, skb, indev: dev, NULL, okfn: vrf_rcv_finish) != 1) |
1223 | skb = NULL; /* kfree_skb(skb) handled by nf code */ |
1224 | |
1225 | return skb; |
1226 | } |
1227 | |
1228 | static int (struct sk_buff *skb, |
1229 | struct net_device *vrf_dev, u16 proto) |
1230 | { |
1231 | struct ethhdr *eth; |
1232 | int err; |
1233 | |
1234 | /* in general, we do not know if there is enough space in the head of |
1235 | * the packet for hosting the mac header. |
1236 | */ |
1237 | err = skb_cow_head(skb, LL_RESERVED_SPACE(vrf_dev)); |
1238 | if (unlikely(err)) |
1239 | /* no space in the skb head */ |
1240 | return -ENOBUFS; |
1241 | |
1242 | __skb_push(skb, ETH_HLEN); |
1243 | eth = (struct ethhdr *)skb->data; |
1244 | |
1245 | skb_reset_mac_header(skb); |
1246 | skb_reset_mac_len(skb); |
1247 | |
1248 | /* we set the ethernet destination and the source addresses to the |
1249 | * address of the VRF device. |
1250 | */ |
1251 | ether_addr_copy(dst: eth->h_dest, src: vrf_dev->dev_addr); |
1252 | ether_addr_copy(dst: eth->h_source, src: vrf_dev->dev_addr); |
1253 | eth->h_proto = htons(proto); |
1254 | |
1255 | /* the destination address of the Ethernet frame corresponds to the |
1256 | * address set on the VRF interface; therefore, the packet is intended |
1257 | * to be processed locally. |
1258 | */ |
1259 | skb->protocol = eth->h_proto; |
1260 | skb->pkt_type = PACKET_HOST; |
1261 | |
1262 | skb_postpush_rcsum(skb, start: skb->data, ETH_HLEN); |
1263 | |
1264 | skb_pull_inline(skb, ETH_HLEN); |
1265 | |
1266 | return 0; |
1267 | } |
1268 | |
1269 | /* prepare and add the mac header to the packet if it was not set previously. |
1270 | * In this way, packet sniffers such as tcpdump can parse the packet correctly. |
1271 | * If the mac header was already set, the original mac header is left |
1272 | * untouched and the function returns immediately. |
1273 | */ |
1274 | static int (struct sk_buff *skb, |
1275 | struct net_device *vrf_dev, |
1276 | u16 proto, struct net_device *orig_dev) |
1277 | { |
1278 | if (skb_mac_header_was_set(skb) && dev_has_header(dev: orig_dev)) |
1279 | return 0; |
1280 | |
1281 | return vrf_prepare_mac_header(skb, vrf_dev, proto); |
1282 | } |
1283 | |
1284 | #if IS_ENABLED(CONFIG_IPV6) |
1285 | /* neighbor handling is done with actual device; do not want |
1286 | * to flip skb->dev for those ndisc packets. This really fails |
1287 | * for multiple next protocols (e.g., NEXTHDR_HOP). But it is |
1288 | * a start. |
1289 | */ |
1290 | static bool ipv6_ndisc_frame(const struct sk_buff *skb) |
1291 | { |
1292 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
1293 | bool rc = false; |
1294 | |
1295 | if (iph->nexthdr == NEXTHDR_ICMP) { |
1296 | const struct icmp6hdr *icmph; |
1297 | struct icmp6hdr _icmph; |
1298 | |
1299 | icmph = skb_header_pointer(skb, offset: sizeof(*iph), |
1300 | len: sizeof(_icmph), buffer: &_icmph); |
1301 | if (!icmph) |
1302 | goto out; |
1303 | |
1304 | switch (icmph->icmp6_type) { |
1305 | case NDISC_ROUTER_SOLICITATION: |
1306 | case NDISC_ROUTER_ADVERTISEMENT: |
1307 | case NDISC_NEIGHBOUR_SOLICITATION: |
1308 | case NDISC_NEIGHBOUR_ADVERTISEMENT: |
1309 | case NDISC_REDIRECT: |
1310 | rc = true; |
1311 | break; |
1312 | } |
1313 | } |
1314 | |
1315 | out: |
1316 | return rc; |
1317 | } |
1318 | |
1319 | static struct rt6_info *vrf_ip6_route_lookup(struct net *net, |
1320 | const struct net_device *dev, |
1321 | struct flowi6 *fl6, |
1322 | int ifindex, |
1323 | const struct sk_buff *skb, |
1324 | int flags) |
1325 | { |
1326 | struct net_vrf *vrf = netdev_priv(dev); |
1327 | |
1328 | return ip6_pol_route(net, table: vrf->fib6_table, ifindex, fl6, skb, flags); |
1329 | } |
1330 | |
1331 | static void vrf_ip6_input_dst(struct sk_buff *skb, struct net_device *vrf_dev, |
1332 | int ifindex) |
1333 | { |
1334 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
1335 | struct flowi6 fl6 = { |
1336 | .flowi6_iif = ifindex, |
1337 | .flowi6_mark = skb->mark, |
1338 | .flowi6_proto = iph->nexthdr, |
1339 | .daddr = iph->daddr, |
1340 | .saddr = iph->saddr, |
1341 | .flowlabel = ip6_flowinfo(hdr: iph), |
1342 | }; |
1343 | struct net *net = dev_net(dev: vrf_dev); |
1344 | struct rt6_info *rt6; |
1345 | |
1346 | rt6 = vrf_ip6_route_lookup(net, dev: vrf_dev, fl6: &fl6, ifindex, skb, |
1347 | RT6_LOOKUP_F_HAS_SADDR | RT6_LOOKUP_F_IFACE); |
1348 | if (unlikely(!rt6)) |
1349 | return; |
1350 | |
1351 | if (unlikely(&rt6->dst == &net->ipv6.ip6_null_entry->dst)) |
1352 | return; |
1353 | |
1354 | skb_dst_set(skb, dst: &rt6->dst); |
1355 | } |
1356 | |
1357 | static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev, |
1358 | struct sk_buff *skb) |
1359 | { |
1360 | int orig_iif = skb->skb_iif; |
1361 | bool need_strict = rt6_need_strict(daddr: &ipv6_hdr(skb)->daddr); |
1362 | bool is_ndisc = ipv6_ndisc_frame(skb); |
1363 | |
1364 | /* loopback, multicast & non-ND link-local traffic; do not push through |
1365 | * packet taps again. Reset pkt_type for upper layers to process skb. |
1366 | * For non-loopback strict packets, determine the dst using the original |
1367 | * ifindex. |
1368 | */ |
1369 | if (skb->pkt_type == PACKET_LOOPBACK || (need_strict && !is_ndisc)) { |
1370 | skb->dev = vrf_dev; |
1371 | skb->skb_iif = vrf_dev->ifindex; |
1372 | IP6CB(skb)->flags |= IP6SKB_L3SLAVE; |
1373 | |
1374 | if (skb->pkt_type == PACKET_LOOPBACK) |
1375 | skb->pkt_type = PACKET_HOST; |
1376 | else |
1377 | vrf_ip6_input_dst(skb, vrf_dev, ifindex: orig_iif); |
1378 | |
1379 | goto out; |
1380 | } |
1381 | |
1382 | /* if packet is NDISC then keep the ingress interface */ |
1383 | if (!is_ndisc) { |
1384 | struct net_device *orig_dev = skb->dev; |
1385 | |
1386 | vrf_rx_stats(dev: vrf_dev, len: skb->len); |
1387 | skb->dev = vrf_dev; |
1388 | skb->skb_iif = vrf_dev->ifindex; |
1389 | |
1390 | if (!list_empty(head: &vrf_dev->ptype_all)) { |
1391 | int err; |
1392 | |
1393 | err = vrf_add_mac_header_if_unset(skb, vrf_dev, |
1394 | ETH_P_IPV6, |
1395 | orig_dev); |
1396 | if (likely(!err)) { |
1397 | skb_push(skb, len: skb->mac_len); |
1398 | dev_queue_xmit_nit(skb, dev: vrf_dev); |
1399 | skb_pull(skb, len: skb->mac_len); |
1400 | } |
1401 | } |
1402 | |
1403 | IP6CB(skb)->flags |= IP6SKB_L3SLAVE; |
1404 | } |
1405 | |
1406 | if (need_strict) |
1407 | vrf_ip6_input_dst(skb, vrf_dev, ifindex: orig_iif); |
1408 | |
1409 | skb = vrf_rcv_nfhook(pf: NFPROTO_IPV6, hook: NF_INET_PRE_ROUTING, skb, dev: vrf_dev); |
1410 | out: |
1411 | return skb; |
1412 | } |
1413 | |
1414 | #else |
1415 | static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev, |
1416 | struct sk_buff *skb) |
1417 | { |
1418 | return skb; |
1419 | } |
1420 | #endif |
1421 | |
1422 | static struct sk_buff *vrf_ip_rcv(struct net_device *vrf_dev, |
1423 | struct sk_buff *skb) |
1424 | { |
1425 | struct net_device *orig_dev = skb->dev; |
1426 | |
1427 | skb->dev = vrf_dev; |
1428 | skb->skb_iif = vrf_dev->ifindex; |
1429 | IPCB(skb)->flags |= IPSKB_L3SLAVE; |
1430 | |
1431 | if (ipv4_is_multicast(addr: ip_hdr(skb)->daddr)) |
1432 | goto out; |
1433 | |
1434 | /* loopback traffic; do not push through packet taps again. |
1435 | * Reset pkt_type for upper layers to process skb |
1436 | */ |
1437 | if (skb->pkt_type == PACKET_LOOPBACK) { |
1438 | skb->pkt_type = PACKET_HOST; |
1439 | goto out; |
1440 | } |
1441 | |
1442 | vrf_rx_stats(dev: vrf_dev, len: skb->len); |
1443 | |
1444 | if (!list_empty(head: &vrf_dev->ptype_all)) { |
1445 | int err; |
1446 | |
1447 | err = vrf_add_mac_header_if_unset(skb, vrf_dev, ETH_P_IP, |
1448 | orig_dev); |
1449 | if (likely(!err)) { |
1450 | skb_push(skb, len: skb->mac_len); |
1451 | dev_queue_xmit_nit(skb, dev: vrf_dev); |
1452 | skb_pull(skb, len: skb->mac_len); |
1453 | } |
1454 | } |
1455 | |
1456 | skb = vrf_rcv_nfhook(pf: NFPROTO_IPV4, hook: NF_INET_PRE_ROUTING, skb, dev: vrf_dev); |
1457 | out: |
1458 | return skb; |
1459 | } |
1460 | |
1461 | /* called with rcu lock held */ |
1462 | static struct sk_buff *vrf_l3_rcv(struct net_device *vrf_dev, |
1463 | struct sk_buff *skb, |
1464 | u16 proto) |
1465 | { |
1466 | switch (proto) { |
1467 | case AF_INET: |
1468 | return vrf_ip_rcv(vrf_dev, skb); |
1469 | case AF_INET6: |
1470 | return vrf_ip6_rcv(vrf_dev, skb); |
1471 | } |
1472 | |
1473 | return skb; |
1474 | } |
1475 | |
1476 | #if IS_ENABLED(CONFIG_IPV6) |
1477 | /* send to link-local or multicast address via interface enslaved to |
1478 | * VRF device. Force lookup to VRF table without changing flow struct |
1479 | * Note: Caller to this function must hold rcu_read_lock() and no refcnt |
1480 | * is taken on the dst by this function. |
1481 | */ |
1482 | static struct dst_entry *vrf_link_scope_lookup(const struct net_device *dev, |
1483 | struct flowi6 *fl6) |
1484 | { |
1485 | struct net *net = dev_net(dev); |
1486 | int flags = RT6_LOOKUP_F_IFACE | RT6_LOOKUP_F_DST_NOREF; |
1487 | struct dst_entry *dst = NULL; |
1488 | struct rt6_info *rt; |
1489 | |
1490 | /* VRF device does not have a link-local address and |
1491 | * sending packets to link-local or mcast addresses over |
1492 | * a VRF device does not make sense |
1493 | */ |
1494 | if (fl6->flowi6_oif == dev->ifindex) { |
1495 | dst = &net->ipv6.ip6_null_entry->dst; |
1496 | return dst; |
1497 | } |
1498 | |
1499 | if (!ipv6_addr_any(a: &fl6->saddr)) |
1500 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
1501 | |
1502 | rt = vrf_ip6_route_lookup(net, dev, fl6, ifindex: fl6->flowi6_oif, NULL, flags); |
1503 | if (rt) |
1504 | dst = &rt->dst; |
1505 | |
1506 | return dst; |
1507 | } |
1508 | #endif |
1509 | |
1510 | static const struct l3mdev_ops vrf_l3mdev_ops = { |
1511 | .l3mdev_fib_table = vrf_fib_table, |
1512 | .l3mdev_l3_rcv = vrf_l3_rcv, |
1513 | .l3mdev_l3_out = vrf_l3_out, |
1514 | #if IS_ENABLED(CONFIG_IPV6) |
1515 | .l3mdev_link_scope_lookup = vrf_link_scope_lookup, |
1516 | #endif |
1517 | }; |
1518 | |
1519 | static void vrf_get_drvinfo(struct net_device *dev, |
1520 | struct ethtool_drvinfo *info) |
1521 | { |
1522 | strscpy(info->driver, DRV_NAME, sizeof(info->driver)); |
1523 | strscpy(info->version, DRV_VERSION, sizeof(info->version)); |
1524 | } |
1525 | |
1526 | static const struct ethtool_ops vrf_ethtool_ops = { |
1527 | .get_drvinfo = vrf_get_drvinfo, |
1528 | }; |
1529 | |
1530 | static inline size_t vrf_fib_rule_nl_size(void) |
1531 | { |
1532 | size_t sz; |
1533 | |
1534 | sz = NLMSG_ALIGN(sizeof(struct fib_rule_hdr)); |
1535 | sz += nla_total_size(payload: sizeof(u8)); /* FRA_L3MDEV */ |
1536 | sz += nla_total_size(payload: sizeof(u32)); /* FRA_PRIORITY */ |
1537 | sz += nla_total_size(payload: sizeof(u8)); /* FRA_PROTOCOL */ |
1538 | |
1539 | return sz; |
1540 | } |
1541 | |
1542 | static int vrf_fib_rule(const struct net_device *dev, __u8 family, bool add_it) |
1543 | { |
1544 | struct fib_rule_hdr *frh; |
1545 | struct nlmsghdr *nlh; |
1546 | struct sk_buff *skb; |
1547 | int err; |
1548 | |
1549 | if ((family == AF_INET6 || family == RTNL_FAMILY_IP6MR) && |
1550 | !ipv6_mod_enabled()) |
1551 | return 0; |
1552 | |
1553 | skb = nlmsg_new(payload: vrf_fib_rule_nl_size(), GFP_KERNEL); |
1554 | if (!skb) |
1555 | return -ENOMEM; |
1556 | |
1557 | nlh = nlmsg_put(skb, portid: 0, seq: 0, type: 0, payload: sizeof(*frh), flags: 0); |
1558 | if (!nlh) |
1559 | goto nla_put_failure; |
1560 | |
1561 | /* rule only needs to appear once */ |
1562 | nlh->nlmsg_flags |= NLM_F_EXCL; |
1563 | |
1564 | frh = nlmsg_data(nlh); |
1565 | memset(frh, 0, sizeof(*frh)); |
1566 | frh->family = family; |
1567 | frh->action = FR_ACT_TO_TBL; |
1568 | |
1569 | if (nla_put_u8(skb, attrtype: FRA_PROTOCOL, RTPROT_KERNEL)) |
1570 | goto nla_put_failure; |
1571 | |
1572 | if (nla_put_u8(skb, attrtype: FRA_L3MDEV, value: 1)) |
1573 | goto nla_put_failure; |
1574 | |
1575 | if (nla_put_u32(skb, attrtype: FRA_PRIORITY, FIB_RULE_PREF)) |
1576 | goto nla_put_failure; |
1577 | |
1578 | nlmsg_end(skb, nlh); |
1579 | |
1580 | /* fib_nl_{new,del}rule handling looks for net from skb->sk */ |
1581 | skb->sk = dev_net(dev)->rtnl; |
1582 | if (add_it) { |
1583 | err = fib_nl_newrule(skb, nlh, NULL); |
1584 | if (err == -EEXIST) |
1585 | err = 0; |
1586 | } else { |
1587 | err = fib_nl_delrule(skb, nlh, NULL); |
1588 | if (err == -ENOENT) |
1589 | err = 0; |
1590 | } |
1591 | nlmsg_free(skb); |
1592 | |
1593 | return err; |
1594 | |
1595 | nla_put_failure: |
1596 | nlmsg_free(skb); |
1597 | |
1598 | return -EMSGSIZE; |
1599 | } |
1600 | |
1601 | static int vrf_add_fib_rules(const struct net_device *dev) |
1602 | { |
1603 | int err; |
1604 | |
1605 | err = vrf_fib_rule(dev, AF_INET, add_it: true); |
1606 | if (err < 0) |
1607 | goto out_err; |
1608 | |
1609 | err = vrf_fib_rule(dev, AF_INET6, add_it: true); |
1610 | if (err < 0) |
1611 | goto ipv6_err; |
1612 | |
1613 | #if IS_ENABLED(CONFIG_IP_MROUTE_MULTIPLE_TABLES) |
1614 | err = vrf_fib_rule(dev, RTNL_FAMILY_IPMR, add_it: true); |
1615 | if (err < 0) |
1616 | goto ipmr_err; |
1617 | #endif |
1618 | |
1619 | #if IS_ENABLED(CONFIG_IPV6_MROUTE_MULTIPLE_TABLES) |
1620 | err = vrf_fib_rule(dev, RTNL_FAMILY_IP6MR, add_it: true); |
1621 | if (err < 0) |
1622 | goto ip6mr_err; |
1623 | #endif |
1624 | |
1625 | return 0; |
1626 | |
1627 | #if IS_ENABLED(CONFIG_IPV6_MROUTE_MULTIPLE_TABLES) |
1628 | ip6mr_err: |
1629 | vrf_fib_rule(dev, RTNL_FAMILY_IPMR, add_it: false); |
1630 | #endif |
1631 | |
1632 | #if IS_ENABLED(CONFIG_IP_MROUTE_MULTIPLE_TABLES) |
1633 | ipmr_err: |
1634 | vrf_fib_rule(dev, AF_INET6, add_it: false); |
1635 | #endif |
1636 | |
1637 | ipv6_err: |
1638 | vrf_fib_rule(dev, AF_INET, add_it: false); |
1639 | |
1640 | out_err: |
1641 | netdev_err(dev, format: "Failed to add FIB rules.\n" ); |
1642 | return err; |
1643 | } |
1644 | |
1645 | static void vrf_setup(struct net_device *dev) |
1646 | { |
1647 | ether_setup(dev); |
1648 | |
1649 | /* Initialize the device structure. */ |
1650 | dev->netdev_ops = &vrf_netdev_ops; |
1651 | dev->l3mdev_ops = &vrf_l3mdev_ops; |
1652 | dev->ethtool_ops = &vrf_ethtool_ops; |
1653 | dev->needs_free_netdev = true; |
1654 | |
1655 | /* Fill in device structure with ethernet-generic values. */ |
1656 | eth_hw_addr_random(dev); |
1657 | |
1658 | /* don't acquire vrf device's netif_tx_lock when transmitting */ |
1659 | dev->features |= NETIF_F_LLTX; |
1660 | |
1661 | /* don't allow vrf devices to change network namespaces. */ |
1662 | dev->features |= NETIF_F_NETNS_LOCAL; |
1663 | |
1664 | /* does not make sense for a VLAN to be added to a vrf device */ |
1665 | dev->features |= NETIF_F_VLAN_CHALLENGED; |
1666 | |
1667 | /* enable offload features */ |
1668 | dev->features |= NETIF_F_GSO_SOFTWARE; |
1669 | dev->features |= NETIF_F_RXCSUM | NETIF_F_HW_CSUM | NETIF_F_SCTP_CRC; |
1670 | dev->features |= NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA; |
1671 | |
1672 | dev->hw_features = dev->features; |
1673 | dev->hw_enc_features = dev->features; |
1674 | |
1675 | /* default to no qdisc; user can add if desired */ |
1676 | dev->priv_flags |= IFF_NO_QUEUE; |
1677 | dev->priv_flags |= IFF_NO_RX_HANDLER; |
1678 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
1679 | |
1680 | /* VRF devices do not care about MTU, but if the MTU is set |
1681 | * too low then the ipv4 and ipv6 protocols are disabled |
1682 | * which breaks networking. |
1683 | */ |
1684 | dev->min_mtu = IPV6_MIN_MTU; |
1685 | dev->max_mtu = IP6_MAX_MTU; |
1686 | dev->mtu = dev->max_mtu; |
1687 | |
1688 | dev->pcpu_stat_type = NETDEV_PCPU_STAT_DSTATS; |
1689 | } |
1690 | |
1691 | static int vrf_validate(struct nlattr *tb[], struct nlattr *data[], |
1692 | struct netlink_ext_ack *extack) |
1693 | { |
1694 | if (tb[IFLA_ADDRESS]) { |
1695 | if (nla_len(nla: tb[IFLA_ADDRESS]) != ETH_ALEN) { |
1696 | NL_SET_ERR_MSG(extack, "Invalid hardware address" ); |
1697 | return -EINVAL; |
1698 | } |
1699 | if (!is_valid_ether_addr(addr: nla_data(nla: tb[IFLA_ADDRESS]))) { |
1700 | NL_SET_ERR_MSG(extack, "Invalid hardware address" ); |
1701 | return -EADDRNOTAVAIL; |
1702 | } |
1703 | } |
1704 | return 0; |
1705 | } |
1706 | |
1707 | static void vrf_dellink(struct net_device *dev, struct list_head *head) |
1708 | { |
1709 | struct net_device *port_dev; |
1710 | struct list_head *iter; |
1711 | |
1712 | netdev_for_each_lower_dev(dev, port_dev, iter) |
1713 | vrf_del_slave(dev, port_dev); |
1714 | |
1715 | vrf_map_unregister_dev(dev); |
1716 | |
1717 | unregister_netdevice_queue(dev, head); |
1718 | } |
1719 | |
1720 | static int vrf_newlink(struct net *src_net, struct net_device *dev, |
1721 | struct nlattr *tb[], struct nlattr *data[], |
1722 | struct netlink_ext_ack *extack) |
1723 | { |
1724 | struct net_vrf *vrf = netdev_priv(dev); |
1725 | struct netns_vrf *nn_vrf; |
1726 | bool *add_fib_rules; |
1727 | struct net *net; |
1728 | int err; |
1729 | |
1730 | if (!data || !data[IFLA_VRF_TABLE]) { |
1731 | NL_SET_ERR_MSG(extack, "VRF table id is missing" ); |
1732 | return -EINVAL; |
1733 | } |
1734 | |
1735 | vrf->tb_id = nla_get_u32(nla: data[IFLA_VRF_TABLE]); |
1736 | if (vrf->tb_id == RT_TABLE_UNSPEC) { |
1737 | NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VRF_TABLE], |
1738 | "Invalid VRF table id" ); |
1739 | return -EINVAL; |
1740 | } |
1741 | |
1742 | dev->priv_flags |= IFF_L3MDEV_MASTER; |
1743 | |
1744 | err = register_netdevice(dev); |
1745 | if (err) |
1746 | goto out; |
1747 | |
1748 | /* mapping between table_id and vrf; |
1749 | * note: such binding could not be done in the dev init function |
1750 | * because dev->ifindex id is not available yet. |
1751 | */ |
1752 | vrf->ifindex = dev->ifindex; |
1753 | |
1754 | err = vrf_map_register_dev(dev, extack); |
1755 | if (err) { |
1756 | unregister_netdevice(dev); |
1757 | goto out; |
1758 | } |
1759 | |
1760 | net = dev_net(dev); |
1761 | nn_vrf = net_generic(net, id: vrf_net_id); |
1762 | |
1763 | add_fib_rules = &nn_vrf->add_fib_rules; |
1764 | if (*add_fib_rules) { |
1765 | err = vrf_add_fib_rules(dev); |
1766 | if (err) { |
1767 | vrf_map_unregister_dev(dev); |
1768 | unregister_netdevice(dev); |
1769 | goto out; |
1770 | } |
1771 | *add_fib_rules = false; |
1772 | } |
1773 | |
1774 | out: |
1775 | return err; |
1776 | } |
1777 | |
1778 | static size_t vrf_nl_getsize(const struct net_device *dev) |
1779 | { |
1780 | return nla_total_size(payload: sizeof(u32)); /* IFLA_VRF_TABLE */ |
1781 | } |
1782 | |
1783 | static int vrf_fillinfo(struct sk_buff *skb, |
1784 | const struct net_device *dev) |
1785 | { |
1786 | struct net_vrf *vrf = netdev_priv(dev); |
1787 | |
1788 | return nla_put_u32(skb, attrtype: IFLA_VRF_TABLE, value: vrf->tb_id); |
1789 | } |
1790 | |
1791 | static size_t vrf_get_slave_size(const struct net_device *bond_dev, |
1792 | const struct net_device *slave_dev) |
1793 | { |
1794 | return nla_total_size(payload: sizeof(u32)); /* IFLA_VRF_PORT_TABLE */ |
1795 | } |
1796 | |
1797 | static int vrf_fill_slave_info(struct sk_buff *skb, |
1798 | const struct net_device *vrf_dev, |
1799 | const struct net_device *slave_dev) |
1800 | { |
1801 | struct net_vrf *vrf = netdev_priv(dev: vrf_dev); |
1802 | |
1803 | if (nla_put_u32(skb, attrtype: IFLA_VRF_PORT_TABLE, value: vrf->tb_id)) |
1804 | return -EMSGSIZE; |
1805 | |
1806 | return 0; |
1807 | } |
1808 | |
1809 | static const struct nla_policy vrf_nl_policy[IFLA_VRF_MAX + 1] = { |
1810 | [IFLA_VRF_TABLE] = { .type = NLA_U32 }, |
1811 | }; |
1812 | |
1813 | static struct rtnl_link_ops vrf_link_ops __read_mostly = { |
1814 | .kind = DRV_NAME, |
1815 | .priv_size = sizeof(struct net_vrf), |
1816 | |
1817 | .get_size = vrf_nl_getsize, |
1818 | .policy = vrf_nl_policy, |
1819 | .validate = vrf_validate, |
1820 | .fill_info = vrf_fillinfo, |
1821 | |
1822 | .get_slave_size = vrf_get_slave_size, |
1823 | .fill_slave_info = vrf_fill_slave_info, |
1824 | |
1825 | .newlink = vrf_newlink, |
1826 | .dellink = vrf_dellink, |
1827 | .setup = vrf_setup, |
1828 | .maxtype = IFLA_VRF_MAX, |
1829 | }; |
1830 | |
1831 | static int vrf_device_event(struct notifier_block *unused, |
1832 | unsigned long event, void *ptr) |
1833 | { |
1834 | struct net_device *dev = netdev_notifier_info_to_dev(info: ptr); |
1835 | |
1836 | /* only care about unregister events to drop slave references */ |
1837 | if (event == NETDEV_UNREGISTER) { |
1838 | struct net_device *vrf_dev; |
1839 | |
1840 | if (!netif_is_l3_slave(dev)) |
1841 | goto out; |
1842 | |
1843 | vrf_dev = netdev_master_upper_dev_get(dev); |
1844 | vrf_del_slave(dev: vrf_dev, port_dev: dev); |
1845 | } |
1846 | out: |
1847 | return NOTIFY_DONE; |
1848 | } |
1849 | |
1850 | static struct notifier_block vrf_notifier_block __read_mostly = { |
1851 | .notifier_call = vrf_device_event, |
1852 | }; |
1853 | |
1854 | static int vrf_map_init(struct vrf_map *vmap) |
1855 | { |
1856 | spin_lock_init(&vmap->vmap_lock); |
1857 | hash_init(vmap->ht); |
1858 | |
1859 | vmap->strict_mode = false; |
1860 | |
1861 | return 0; |
1862 | } |
1863 | |
1864 | #ifdef CONFIG_SYSCTL |
1865 | static bool vrf_strict_mode(struct vrf_map *vmap) |
1866 | { |
1867 | bool strict_mode; |
1868 | |
1869 | vrf_map_lock(vmap); |
1870 | strict_mode = vmap->strict_mode; |
1871 | vrf_map_unlock(vmap); |
1872 | |
1873 | return strict_mode; |
1874 | } |
1875 | |
1876 | static int vrf_strict_mode_change(struct vrf_map *vmap, bool new_mode) |
1877 | { |
1878 | bool *cur_mode; |
1879 | int res = 0; |
1880 | |
1881 | vrf_map_lock(vmap); |
1882 | |
1883 | cur_mode = &vmap->strict_mode; |
1884 | if (*cur_mode == new_mode) |
1885 | goto unlock; |
1886 | |
1887 | if (*cur_mode) { |
1888 | /* disable strict mode */ |
1889 | *cur_mode = false; |
1890 | } else { |
1891 | if (vmap->shared_tables) { |
1892 | /* we cannot allow strict_mode because there are some |
1893 | * vrfs that share one or more tables. |
1894 | */ |
1895 | res = -EBUSY; |
1896 | goto unlock; |
1897 | } |
1898 | |
1899 | /* no tables are shared among vrfs, so we can go back |
1900 | * to 1:1 association between a vrf with its table. |
1901 | */ |
1902 | *cur_mode = true; |
1903 | } |
1904 | |
1905 | unlock: |
1906 | vrf_map_unlock(vmap); |
1907 | |
1908 | return res; |
1909 | } |
1910 | |
1911 | static int vrf_shared_table_handler(struct ctl_table *table, int write, |
1912 | void *buffer, size_t *lenp, loff_t *ppos) |
1913 | { |
1914 | struct net *net = (struct net *)table->extra1; |
1915 | struct vrf_map *vmap = netns_vrf_map(net); |
1916 | int proc_strict_mode = 0; |
1917 | struct ctl_table tmp = { |
1918 | .procname = table->procname, |
1919 | .data = &proc_strict_mode, |
1920 | .maxlen = sizeof(int), |
1921 | .mode = table->mode, |
1922 | .extra1 = SYSCTL_ZERO, |
1923 | .extra2 = SYSCTL_ONE, |
1924 | }; |
1925 | int ret; |
1926 | |
1927 | if (!write) |
1928 | proc_strict_mode = vrf_strict_mode(vmap); |
1929 | |
1930 | ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); |
1931 | |
1932 | if (write && ret == 0) |
1933 | ret = vrf_strict_mode_change(vmap, new_mode: (bool)proc_strict_mode); |
1934 | |
1935 | return ret; |
1936 | } |
1937 | |
1938 | static const struct ctl_table vrf_table[] = { |
1939 | { |
1940 | .procname = "strict_mode" , |
1941 | .data = NULL, |
1942 | .maxlen = sizeof(int), |
1943 | .mode = 0644, |
1944 | .proc_handler = vrf_shared_table_handler, |
1945 | /* set by the vrf_netns_init */ |
1946 | .extra1 = NULL, |
1947 | }, |
1948 | }; |
1949 | |
1950 | static int vrf_netns_init_sysctl(struct net *net, struct netns_vrf *nn_vrf) |
1951 | { |
1952 | struct ctl_table *table; |
1953 | |
1954 | table = kmemdup(p: vrf_table, size: sizeof(vrf_table), GFP_KERNEL); |
1955 | if (!table) |
1956 | return -ENOMEM; |
1957 | |
1958 | /* init the extra1 parameter with the reference to current netns */ |
1959 | table[0].extra1 = net; |
1960 | |
1961 | nn_vrf->ctl_hdr = register_net_sysctl_sz(net, path: "net/vrf" , table, |
1962 | ARRAY_SIZE(vrf_table)); |
1963 | if (!nn_vrf->ctl_hdr) { |
1964 | kfree(objp: table); |
1965 | return -ENOMEM; |
1966 | } |
1967 | |
1968 | return 0; |
1969 | } |
1970 | |
1971 | static void vrf_netns_exit_sysctl(struct net *net) |
1972 | { |
1973 | struct netns_vrf *nn_vrf = net_generic(net, id: vrf_net_id); |
1974 | struct ctl_table *table; |
1975 | |
1976 | table = nn_vrf->ctl_hdr->ctl_table_arg; |
1977 | unregister_net_sysctl_table(header: nn_vrf->ctl_hdr); |
1978 | kfree(objp: table); |
1979 | } |
1980 | #else |
1981 | static int vrf_netns_init_sysctl(struct net *net, struct netns_vrf *nn_vrf) |
1982 | { |
1983 | return 0; |
1984 | } |
1985 | |
1986 | static void vrf_netns_exit_sysctl(struct net *net) |
1987 | { |
1988 | } |
1989 | #endif |
1990 | |
1991 | /* Initialize per network namespace state */ |
1992 | static int __net_init vrf_netns_init(struct net *net) |
1993 | { |
1994 | struct netns_vrf *nn_vrf = net_generic(net, id: vrf_net_id); |
1995 | |
1996 | nn_vrf->add_fib_rules = true; |
1997 | vrf_map_init(vmap: &nn_vrf->vmap); |
1998 | |
1999 | return vrf_netns_init_sysctl(net, nn_vrf); |
2000 | } |
2001 | |
2002 | static void __net_exit vrf_netns_exit(struct net *net) |
2003 | { |
2004 | vrf_netns_exit_sysctl(net); |
2005 | } |
2006 | |
2007 | static struct pernet_operations vrf_net_ops __net_initdata = { |
2008 | .init = vrf_netns_init, |
2009 | .exit = vrf_netns_exit, |
2010 | .id = &vrf_net_id, |
2011 | .size = sizeof(struct netns_vrf), |
2012 | }; |
2013 | |
2014 | static int __init vrf_init_module(void) |
2015 | { |
2016 | int rc; |
2017 | |
2018 | register_netdevice_notifier(nb: &vrf_notifier_block); |
2019 | |
2020 | rc = register_pernet_subsys(&vrf_net_ops); |
2021 | if (rc < 0) |
2022 | goto error; |
2023 | |
2024 | rc = l3mdev_table_lookup_register(l3type: L3MDEV_TYPE_VRF, |
2025 | fn: vrf_ifindex_lookup_by_table_id); |
2026 | if (rc < 0) |
2027 | goto unreg_pernet; |
2028 | |
2029 | rc = rtnl_link_register(ops: &vrf_link_ops); |
2030 | if (rc < 0) |
2031 | goto table_lookup_unreg; |
2032 | |
2033 | return 0; |
2034 | |
2035 | table_lookup_unreg: |
2036 | l3mdev_table_lookup_unregister(l3type: L3MDEV_TYPE_VRF, |
2037 | fn: vrf_ifindex_lookup_by_table_id); |
2038 | |
2039 | unreg_pernet: |
2040 | unregister_pernet_subsys(&vrf_net_ops); |
2041 | |
2042 | error: |
2043 | unregister_netdevice_notifier(nb: &vrf_notifier_block); |
2044 | return rc; |
2045 | } |
2046 | |
2047 | module_init(vrf_init_module); |
2048 | MODULE_AUTHOR("Shrijeet Mukherjee, David Ahern" ); |
2049 | MODULE_DESCRIPTION("Device driver to instantiate VRF domains" ); |
2050 | MODULE_LICENSE("GPL" ); |
2051 | MODULE_ALIAS_RTNL_LINK(DRV_NAME); |
2052 | MODULE_VERSION(DRV_VERSION); |
2053 | |