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 | struct pcpu_dstats { |
125 | u64 tx_pkts; |
126 | u64 tx_bytes; |
127 | u64 tx_drps; |
128 | u64 rx_pkts; |
129 | u64 rx_bytes; |
130 | u64 rx_drps; |
131 | struct u64_stats_sync syncp; |
132 | }; |
133 | |
134 | static void vrf_rx_stats(struct net_device *dev, int len) |
135 | { |
136 | struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats); |
137 | |
138 | u64_stats_update_begin(syncp: &dstats->syncp); |
139 | dstats->rx_pkts++; |
140 | dstats->rx_bytes += len; |
141 | u64_stats_update_end(syncp: &dstats->syncp); |
142 | } |
143 | |
144 | static void vrf_tx_error(struct net_device *vrf_dev, struct sk_buff *skb) |
145 | { |
146 | vrf_dev->stats.tx_errors++; |
147 | kfree_skb(skb); |
148 | } |
149 | |
150 | static void vrf_get_stats64(struct net_device *dev, |
151 | struct rtnl_link_stats64 *stats) |
152 | { |
153 | int i; |
154 | |
155 | for_each_possible_cpu(i) { |
156 | const struct pcpu_dstats *dstats; |
157 | u64 tbytes, tpkts, tdrops, rbytes, rpkts; |
158 | unsigned int start; |
159 | |
160 | dstats = per_cpu_ptr(dev->dstats, i); |
161 | do { |
162 | start = u64_stats_fetch_begin(syncp: &dstats->syncp); |
163 | tbytes = dstats->tx_bytes; |
164 | tpkts = dstats->tx_pkts; |
165 | tdrops = dstats->tx_drps; |
166 | rbytes = dstats->rx_bytes; |
167 | rpkts = dstats->rx_pkts; |
168 | } while (u64_stats_fetch_retry(syncp: &dstats->syncp, start)); |
169 | stats->tx_bytes += tbytes; |
170 | stats->tx_packets += tpkts; |
171 | stats->tx_dropped += tdrops; |
172 | stats->rx_bytes += rbytes; |
173 | stats->rx_packets += rpkts; |
174 | } |
175 | } |
176 | |
177 | static struct vrf_map *netns_vrf_map(struct net *net) |
178 | { |
179 | struct netns_vrf *nn_vrf = net_generic(net, id: vrf_net_id); |
180 | |
181 | return &nn_vrf->vmap; |
182 | } |
183 | |
184 | static struct vrf_map *netns_vrf_map_by_dev(struct net_device *dev) |
185 | { |
186 | return netns_vrf_map(net: dev_net(dev)); |
187 | } |
188 | |
189 | static int vrf_map_elem_get_vrf_ifindex(struct vrf_map_elem *me) |
190 | { |
191 | struct list_head *me_head = &me->vrf_list; |
192 | struct net_vrf *vrf; |
193 | |
194 | if (list_empty(head: me_head)) |
195 | return -ENODEV; |
196 | |
197 | vrf = list_first_entry(me_head, struct net_vrf, me_list); |
198 | |
199 | return vrf->ifindex; |
200 | } |
201 | |
202 | static struct vrf_map_elem *vrf_map_elem_alloc(gfp_t flags) |
203 | { |
204 | struct vrf_map_elem *me; |
205 | |
206 | me = kmalloc(size: sizeof(*me), flags); |
207 | if (!me) |
208 | return NULL; |
209 | |
210 | return me; |
211 | } |
212 | |
213 | static void vrf_map_elem_free(struct vrf_map_elem *me) |
214 | { |
215 | kfree(objp: me); |
216 | } |
217 | |
218 | static void vrf_map_elem_init(struct vrf_map_elem *me, int table_id, |
219 | int ifindex, int users) |
220 | { |
221 | me->table_id = table_id; |
222 | me->ifindex = ifindex; |
223 | me->users = users; |
224 | INIT_LIST_HEAD(list: &me->vrf_list); |
225 | } |
226 | |
227 | static struct vrf_map_elem *vrf_map_lookup_elem(struct vrf_map *vmap, |
228 | u32 table_id) |
229 | { |
230 | struct vrf_map_elem *me; |
231 | u32 key; |
232 | |
233 | key = jhash_1word(a: table_id, HASH_INITVAL); |
234 | hash_for_each_possible(vmap->ht, me, hnode, key) { |
235 | if (me->table_id == table_id) |
236 | return me; |
237 | } |
238 | |
239 | return NULL; |
240 | } |
241 | |
242 | static void vrf_map_add_elem(struct vrf_map *vmap, struct vrf_map_elem *me) |
243 | { |
244 | u32 table_id = me->table_id; |
245 | u32 key; |
246 | |
247 | key = jhash_1word(a: table_id, HASH_INITVAL); |
248 | hash_add(vmap->ht, &me->hnode, key); |
249 | } |
250 | |
251 | static void vrf_map_del_elem(struct vrf_map_elem *me) |
252 | { |
253 | hash_del(node: &me->hnode); |
254 | } |
255 | |
256 | static void vrf_map_lock(struct vrf_map *vmap) __acquires(&vmap->vmap_lock) |
257 | { |
258 | spin_lock(lock: &vmap->vmap_lock); |
259 | } |
260 | |
261 | static void vrf_map_unlock(struct vrf_map *vmap) __releases(&vmap->vmap_lock) |
262 | { |
263 | spin_unlock(lock: &vmap->vmap_lock); |
264 | } |
265 | |
266 | /* called with rtnl lock held */ |
267 | static int |
268 | vrf_map_register_dev(struct net_device *dev, struct netlink_ext_ack *extack) |
269 | { |
270 | struct vrf_map *vmap = netns_vrf_map_by_dev(dev); |
271 | struct net_vrf *vrf = netdev_priv(dev); |
272 | struct vrf_map_elem *new_me, *me; |
273 | u32 table_id = vrf->tb_id; |
274 | bool free_new_me = false; |
275 | int users; |
276 | int res; |
277 | |
278 | /* we pre-allocate elements used in the spin-locked section (so that we |
279 | * keep the spinlock as short as possible). |
280 | */ |
281 | new_me = vrf_map_elem_alloc(GFP_KERNEL); |
282 | if (!new_me) |
283 | return -ENOMEM; |
284 | |
285 | vrf_map_elem_init(me: new_me, table_id, ifindex: dev->ifindex, users: 0); |
286 | |
287 | vrf_map_lock(vmap); |
288 | |
289 | me = vrf_map_lookup_elem(vmap, table_id); |
290 | if (!me) { |
291 | me = new_me; |
292 | vrf_map_add_elem(vmap, me); |
293 | goto link_vrf; |
294 | } |
295 | |
296 | /* we already have an entry in the vrf_map, so it means there is (at |
297 | * least) a vrf registered on the specific table. |
298 | */ |
299 | free_new_me = true; |
300 | if (vmap->strict_mode) { |
301 | /* vrfs cannot share the same table */ |
302 | NL_SET_ERR_MSG(extack, "Table is used by another VRF" ); |
303 | res = -EBUSY; |
304 | goto unlock; |
305 | } |
306 | |
307 | link_vrf: |
308 | users = ++me->users; |
309 | if (users == 2) |
310 | ++vmap->shared_tables; |
311 | |
312 | list_add(new: &vrf->me_list, head: &me->vrf_list); |
313 | |
314 | res = 0; |
315 | |
316 | unlock: |
317 | vrf_map_unlock(vmap); |
318 | |
319 | /* clean-up, if needed */ |
320 | if (free_new_me) |
321 | vrf_map_elem_free(me: new_me); |
322 | |
323 | return res; |
324 | } |
325 | |
326 | /* called with rtnl lock held */ |
327 | static void vrf_map_unregister_dev(struct net_device *dev) |
328 | { |
329 | struct vrf_map *vmap = netns_vrf_map_by_dev(dev); |
330 | struct net_vrf *vrf = netdev_priv(dev); |
331 | u32 table_id = vrf->tb_id; |
332 | struct vrf_map_elem *me; |
333 | int users; |
334 | |
335 | vrf_map_lock(vmap); |
336 | |
337 | me = vrf_map_lookup_elem(vmap, table_id); |
338 | if (!me) |
339 | goto unlock; |
340 | |
341 | list_del(entry: &vrf->me_list); |
342 | |
343 | users = --me->users; |
344 | if (users == 1) { |
345 | --vmap->shared_tables; |
346 | } else if (users == 0) { |
347 | vrf_map_del_elem(me); |
348 | |
349 | /* no one will refer to this element anymore */ |
350 | vrf_map_elem_free(me); |
351 | } |
352 | |
353 | unlock: |
354 | vrf_map_unlock(vmap); |
355 | } |
356 | |
357 | /* return the vrf device index associated with the table_id */ |
358 | static int vrf_ifindex_lookup_by_table_id(struct net *net, u32 table_id) |
359 | { |
360 | struct vrf_map *vmap = netns_vrf_map(net); |
361 | struct vrf_map_elem *me; |
362 | int ifindex; |
363 | |
364 | vrf_map_lock(vmap); |
365 | |
366 | if (!vmap->strict_mode) { |
367 | ifindex = -EPERM; |
368 | goto unlock; |
369 | } |
370 | |
371 | me = vrf_map_lookup_elem(vmap, table_id); |
372 | if (!me) { |
373 | ifindex = -ENODEV; |
374 | goto unlock; |
375 | } |
376 | |
377 | ifindex = vrf_map_elem_get_vrf_ifindex(me); |
378 | |
379 | unlock: |
380 | vrf_map_unlock(vmap); |
381 | |
382 | return ifindex; |
383 | } |
384 | |
385 | /* by default VRF devices do not have a qdisc and are expected |
386 | * to be created with only a single queue. |
387 | */ |
388 | static bool qdisc_tx_is_default(const struct net_device *dev) |
389 | { |
390 | struct netdev_queue *txq; |
391 | struct Qdisc *qdisc; |
392 | |
393 | if (dev->num_tx_queues > 1) |
394 | return false; |
395 | |
396 | txq = netdev_get_tx_queue(dev, index: 0); |
397 | qdisc = rcu_access_pointer(txq->qdisc); |
398 | |
399 | return !qdisc->enqueue; |
400 | } |
401 | |
402 | /* Local traffic destined to local address. Reinsert the packet to rx |
403 | * path, similar to loopback handling. |
404 | */ |
405 | static int vrf_local_xmit(struct sk_buff *skb, struct net_device *dev, |
406 | struct dst_entry *dst) |
407 | { |
408 | int len = skb->len; |
409 | |
410 | skb_orphan(skb); |
411 | |
412 | skb_dst_set(skb, dst); |
413 | |
414 | /* set pkt_type to avoid skb hitting packet taps twice - |
415 | * once on Tx and again in Rx processing |
416 | */ |
417 | skb->pkt_type = PACKET_LOOPBACK; |
418 | |
419 | skb->protocol = eth_type_trans(skb, dev); |
420 | |
421 | if (likely(__netif_rx(skb) == NET_RX_SUCCESS)) |
422 | vrf_rx_stats(dev, len); |
423 | else |
424 | this_cpu_inc(dev->dstats->rx_drps); |
425 | |
426 | return NETDEV_TX_OK; |
427 | } |
428 | |
429 | static void vrf_nf_set_untracked(struct sk_buff *skb) |
430 | { |
431 | if (skb_get_nfct(skb) == 0) |
432 | nf_ct_set(skb, NULL, info: IP_CT_UNTRACKED); |
433 | } |
434 | |
435 | static void vrf_nf_reset_ct(struct sk_buff *skb) |
436 | { |
437 | if (skb_get_nfct(skb) == IP_CT_UNTRACKED) |
438 | nf_reset_ct(skb); |
439 | } |
440 | |
441 | #if IS_ENABLED(CONFIG_IPV6) |
442 | static int vrf_ip6_local_out(struct net *net, struct sock *sk, |
443 | struct sk_buff *skb) |
444 | { |
445 | int err; |
446 | |
447 | vrf_nf_reset_ct(skb); |
448 | |
449 | err = nf_hook(pf: NFPROTO_IPV6, hook: NF_INET_LOCAL_OUT, net, |
450 | sk, skb, NULL, outdev: skb_dst(skb)->dev, okfn: dst_output); |
451 | |
452 | if (likely(err == 1)) |
453 | err = dst_output(net, sk, skb); |
454 | |
455 | return err; |
456 | } |
457 | |
458 | static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb, |
459 | struct net_device *dev) |
460 | { |
461 | const struct ipv6hdr *iph; |
462 | struct net *net = dev_net(dev: skb->dev); |
463 | struct flowi6 fl6; |
464 | int ret = NET_XMIT_DROP; |
465 | struct dst_entry *dst; |
466 | struct dst_entry *dst_null = &net->ipv6.ip6_null_entry->dst; |
467 | |
468 | if (!pskb_may_pull(skb, ETH_HLEN + sizeof(struct ipv6hdr))) |
469 | goto err; |
470 | |
471 | iph = ipv6_hdr(skb); |
472 | |
473 | memset(&fl6, 0, sizeof(fl6)); |
474 | /* needed to match OIF rule */ |
475 | fl6.flowi6_l3mdev = dev->ifindex; |
476 | fl6.flowi6_iif = LOOPBACK_IFINDEX; |
477 | fl6.daddr = iph->daddr; |
478 | fl6.saddr = iph->saddr; |
479 | fl6.flowlabel = ip6_flowinfo(hdr: iph); |
480 | fl6.flowi6_mark = skb->mark; |
481 | fl6.flowi6_proto = iph->nexthdr; |
482 | |
483 | dst = ip6_dst_lookup_flow(net, NULL, fl6: &fl6, NULL); |
484 | if (IS_ERR(ptr: dst) || dst == dst_null) |
485 | goto err; |
486 | |
487 | skb_dst_drop(skb); |
488 | |
489 | /* if dst.dev is the VRF device again this is locally originated traffic |
490 | * destined to a local address. Short circuit to Rx path. |
491 | */ |
492 | if (dst->dev == dev) |
493 | return vrf_local_xmit(skb, dev, dst); |
494 | |
495 | skb_dst_set(skb, dst); |
496 | |
497 | /* strip the ethernet header added for pass through VRF device */ |
498 | __skb_pull(skb, len: skb_network_offset(skb)); |
499 | |
500 | memset(IP6CB(skb), 0, sizeof(*IP6CB(skb))); |
501 | ret = vrf_ip6_local_out(net, sk: skb->sk, skb); |
502 | if (unlikely(net_xmit_eval(ret))) |
503 | dev->stats.tx_errors++; |
504 | else |
505 | ret = NET_XMIT_SUCCESS; |
506 | |
507 | return ret; |
508 | err: |
509 | vrf_tx_error(vrf_dev: dev, skb); |
510 | return NET_XMIT_DROP; |
511 | } |
512 | #else |
513 | static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb, |
514 | struct net_device *dev) |
515 | { |
516 | vrf_tx_error(dev, skb); |
517 | return NET_XMIT_DROP; |
518 | } |
519 | #endif |
520 | |
521 | /* based on ip_local_out; can't use it b/c the dst is switched pointing to us */ |
522 | static int vrf_ip_local_out(struct net *net, struct sock *sk, |
523 | struct sk_buff *skb) |
524 | { |
525 | int err; |
526 | |
527 | vrf_nf_reset_ct(skb); |
528 | |
529 | err = nf_hook(pf: NFPROTO_IPV4, hook: NF_INET_LOCAL_OUT, net, sk, |
530 | skb, NULL, outdev: skb_dst(skb)->dev, okfn: dst_output); |
531 | if (likely(err == 1)) |
532 | err = dst_output(net, sk, skb); |
533 | |
534 | return err; |
535 | } |
536 | |
537 | static netdev_tx_t vrf_process_v4_outbound(struct sk_buff *skb, |
538 | struct net_device *vrf_dev) |
539 | { |
540 | struct iphdr *ip4h; |
541 | int ret = NET_XMIT_DROP; |
542 | struct flowi4 fl4; |
543 | struct net *net = dev_net(dev: vrf_dev); |
544 | struct rtable *rt; |
545 | |
546 | if (!pskb_may_pull(skb, ETH_HLEN + sizeof(struct iphdr))) |
547 | goto err; |
548 | |
549 | ip4h = ip_hdr(skb); |
550 | |
551 | memset(&fl4, 0, sizeof(fl4)); |
552 | /* needed to match OIF rule */ |
553 | fl4.flowi4_l3mdev = vrf_dev->ifindex; |
554 | fl4.flowi4_iif = LOOPBACK_IFINDEX; |
555 | fl4.flowi4_tos = RT_TOS(ip4h->tos); |
556 | fl4.flowi4_flags = FLOWI_FLAG_ANYSRC; |
557 | fl4.flowi4_proto = ip4h->protocol; |
558 | fl4.daddr = ip4h->daddr; |
559 | fl4.saddr = ip4h->saddr; |
560 | |
561 | rt = ip_route_output_flow(net, flp: &fl4, NULL); |
562 | if (IS_ERR(ptr: rt)) |
563 | goto err; |
564 | |
565 | skb_dst_drop(skb); |
566 | |
567 | /* if dst.dev is the VRF device again this is locally originated traffic |
568 | * destined to a local address. Short circuit to Rx path. |
569 | */ |
570 | if (rt->dst.dev == vrf_dev) |
571 | return vrf_local_xmit(skb, dev: vrf_dev, dst: &rt->dst); |
572 | |
573 | skb_dst_set(skb, dst: &rt->dst); |
574 | |
575 | /* strip the ethernet header added for pass through VRF device */ |
576 | __skb_pull(skb, len: skb_network_offset(skb)); |
577 | |
578 | if (!ip4h->saddr) { |
579 | ip4h->saddr = inet_select_addr(dev: skb_dst(skb)->dev, dst: 0, |
580 | scope: RT_SCOPE_LINK); |
581 | } |
582 | |
583 | memset(IPCB(skb), 0, sizeof(*IPCB(skb))); |
584 | ret = vrf_ip_local_out(net: dev_net(dev: skb_dst(skb)->dev), sk: skb->sk, skb); |
585 | if (unlikely(net_xmit_eval(ret))) |
586 | vrf_dev->stats.tx_errors++; |
587 | else |
588 | ret = NET_XMIT_SUCCESS; |
589 | |
590 | out: |
591 | return ret; |
592 | err: |
593 | vrf_tx_error(vrf_dev, skb); |
594 | goto out; |
595 | } |
596 | |
597 | static netdev_tx_t is_ip_tx_frame(struct sk_buff *skb, struct net_device *dev) |
598 | { |
599 | switch (skb->protocol) { |
600 | case htons(ETH_P_IP): |
601 | return vrf_process_v4_outbound(skb, vrf_dev: dev); |
602 | case htons(ETH_P_IPV6): |
603 | return vrf_process_v6_outbound(skb, dev); |
604 | default: |
605 | vrf_tx_error(vrf_dev: dev, skb); |
606 | return NET_XMIT_DROP; |
607 | } |
608 | } |
609 | |
610 | static netdev_tx_t vrf_xmit(struct sk_buff *skb, struct net_device *dev) |
611 | { |
612 | int len = skb->len; |
613 | netdev_tx_t ret = is_ip_tx_frame(skb, dev); |
614 | |
615 | if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { |
616 | struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats); |
617 | |
618 | u64_stats_update_begin(syncp: &dstats->syncp); |
619 | dstats->tx_pkts++; |
620 | dstats->tx_bytes += len; |
621 | u64_stats_update_end(syncp: &dstats->syncp); |
622 | } else { |
623 | this_cpu_inc(dev->dstats->tx_drps); |
624 | } |
625 | |
626 | return ret; |
627 | } |
628 | |
629 | static void vrf_finish_direct(struct sk_buff *skb) |
630 | { |
631 | struct net_device *vrf_dev = skb->dev; |
632 | |
633 | if (!list_empty(head: &vrf_dev->ptype_all) && |
634 | likely(skb_headroom(skb) >= ETH_HLEN)) { |
635 | struct ethhdr *eth = skb_push(skb, ETH_HLEN); |
636 | |
637 | ether_addr_copy(dst: eth->h_source, src: vrf_dev->dev_addr); |
638 | eth_zero_addr(addr: eth->h_dest); |
639 | eth->h_proto = skb->protocol; |
640 | |
641 | dev_queue_xmit_nit(skb, dev: vrf_dev); |
642 | |
643 | skb_pull(skb, ETH_HLEN); |
644 | } |
645 | |
646 | vrf_nf_reset_ct(skb); |
647 | } |
648 | |
649 | #if IS_ENABLED(CONFIG_IPV6) |
650 | /* modelled after ip6_finish_output2 */ |
651 | static int vrf_finish_output6(struct net *net, struct sock *sk, |
652 | struct sk_buff *skb) |
653 | { |
654 | struct dst_entry *dst = skb_dst(skb); |
655 | struct net_device *dev = dst->dev; |
656 | const struct in6_addr *nexthop; |
657 | struct neighbour *neigh; |
658 | int ret; |
659 | |
660 | vrf_nf_reset_ct(skb); |
661 | |
662 | skb->protocol = htons(ETH_P_IPV6); |
663 | skb->dev = dev; |
664 | |
665 | rcu_read_lock(); |
666 | nexthop = rt6_nexthop(rt: (struct rt6_info *)dst, daddr: &ipv6_hdr(skb)->daddr); |
667 | neigh = __ipv6_neigh_lookup_noref(dev: dst->dev, pkey: nexthop); |
668 | if (unlikely(!neigh)) |
669 | neigh = __neigh_create(tbl: &nd_tbl, pkey: nexthop, dev: dst->dev, want_ref: false); |
670 | if (!IS_ERR(ptr: neigh)) { |
671 | sock_confirm_neigh(skb, n: neigh); |
672 | ret = neigh_output(n: neigh, skb, skip_cache: false); |
673 | rcu_read_unlock(); |
674 | return ret; |
675 | } |
676 | rcu_read_unlock(); |
677 | |
678 | IP6_INC_STATS(dev_net(dst->dev), |
679 | ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES); |
680 | kfree_skb(skb); |
681 | return -EINVAL; |
682 | } |
683 | |
684 | /* modelled after ip6_output */ |
685 | static int vrf_output6(struct net *net, struct sock *sk, struct sk_buff *skb) |
686 | { |
687 | return NF_HOOK_COND(pf: NFPROTO_IPV6, hook: NF_INET_POST_ROUTING, |
688 | net, sk, skb, NULL, out: skb_dst(skb)->dev, |
689 | okfn: vrf_finish_output6, |
690 | cond: !(IP6CB(skb)->flags & IP6SKB_REROUTED)); |
691 | } |
692 | |
693 | /* set dst on skb to send packet to us via dev_xmit path. Allows |
694 | * packet to go through device based features such as qdisc, netfilter |
695 | * hooks and packet sockets with skb->dev set to vrf device. |
696 | */ |
697 | static struct sk_buff *vrf_ip6_out_redirect(struct net_device *vrf_dev, |
698 | struct sk_buff *skb) |
699 | { |
700 | struct net_vrf *vrf = netdev_priv(dev: vrf_dev); |
701 | struct dst_entry *dst = NULL; |
702 | struct rt6_info *rt6; |
703 | |
704 | rcu_read_lock(); |
705 | |
706 | rt6 = rcu_dereference(vrf->rt6); |
707 | if (likely(rt6)) { |
708 | dst = &rt6->dst; |
709 | dst_hold(dst); |
710 | } |
711 | |
712 | rcu_read_unlock(); |
713 | |
714 | if (unlikely(!dst)) { |
715 | vrf_tx_error(vrf_dev, skb); |
716 | return NULL; |
717 | } |
718 | |
719 | skb_dst_drop(skb); |
720 | skb_dst_set(skb, dst); |
721 | |
722 | return skb; |
723 | } |
724 | |
725 | static int vrf_output6_direct_finish(struct net *net, struct sock *sk, |
726 | struct sk_buff *skb) |
727 | { |
728 | vrf_finish_direct(skb); |
729 | |
730 | return vrf_ip6_local_out(net, sk, skb); |
731 | } |
732 | |
733 | static int vrf_output6_direct(struct net *net, struct sock *sk, |
734 | struct sk_buff *skb) |
735 | { |
736 | int err = 1; |
737 | |
738 | skb->protocol = htons(ETH_P_IPV6); |
739 | |
740 | if (!(IPCB(skb)->flags & IPSKB_REROUTED)) |
741 | err = nf_hook(pf: NFPROTO_IPV6, hook: NF_INET_POST_ROUTING, net, sk, skb, |
742 | NULL, outdev: skb->dev, okfn: vrf_output6_direct_finish); |
743 | |
744 | if (likely(err == 1)) |
745 | vrf_finish_direct(skb); |
746 | |
747 | return err; |
748 | } |
749 | |
750 | static int vrf_ip6_out_direct_finish(struct net *net, struct sock *sk, |
751 | struct sk_buff *skb) |
752 | { |
753 | int err; |
754 | |
755 | err = vrf_output6_direct(net, sk, skb); |
756 | if (likely(err == 1)) |
757 | err = vrf_ip6_local_out(net, sk, skb); |
758 | |
759 | return err; |
760 | } |
761 | |
762 | static struct sk_buff *vrf_ip6_out_direct(struct net_device *vrf_dev, |
763 | struct sock *sk, |
764 | struct sk_buff *skb) |
765 | { |
766 | struct net *net = dev_net(dev: vrf_dev); |
767 | int err; |
768 | |
769 | skb->dev = vrf_dev; |
770 | |
771 | err = nf_hook(pf: NFPROTO_IPV6, hook: NF_INET_LOCAL_OUT, net, sk, |
772 | skb, NULL, outdev: vrf_dev, okfn: vrf_ip6_out_direct_finish); |
773 | |
774 | if (likely(err == 1)) |
775 | err = vrf_output6_direct(net, sk, skb); |
776 | |
777 | if (likely(err == 1)) |
778 | return skb; |
779 | |
780 | return NULL; |
781 | } |
782 | |
783 | static struct sk_buff *vrf_ip6_out(struct net_device *vrf_dev, |
784 | struct sock *sk, |
785 | struct sk_buff *skb) |
786 | { |
787 | /* don't divert link scope packets */ |
788 | if (rt6_need_strict(daddr: &ipv6_hdr(skb)->daddr)) |
789 | return skb; |
790 | |
791 | vrf_nf_set_untracked(skb); |
792 | |
793 | if (qdisc_tx_is_default(dev: vrf_dev) || |
794 | IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED) |
795 | return vrf_ip6_out_direct(vrf_dev, sk, skb); |
796 | |
797 | return vrf_ip6_out_redirect(vrf_dev, skb); |
798 | } |
799 | |
800 | /* holding rtnl */ |
801 | static void vrf_rt6_release(struct net_device *dev, struct net_vrf *vrf) |
802 | { |
803 | struct rt6_info *rt6 = rtnl_dereference(vrf->rt6); |
804 | struct net *net = dev_net(dev); |
805 | struct dst_entry *dst; |
806 | |
807 | RCU_INIT_POINTER(vrf->rt6, NULL); |
808 | synchronize_rcu(); |
809 | |
810 | /* move dev in dst's to loopback so this VRF device can be deleted |
811 | * - based on dst_ifdown |
812 | */ |
813 | if (rt6) { |
814 | dst = &rt6->dst; |
815 | netdev_ref_replace(odev: dst->dev, ndev: net->loopback_dev, |
816 | tracker: &dst->dev_tracker, GFP_KERNEL); |
817 | dst->dev = net->loopback_dev; |
818 | dst_release(dst); |
819 | } |
820 | } |
821 | |
822 | static int vrf_rt6_create(struct net_device *dev) |
823 | { |
824 | int flags = DST_NOPOLICY | DST_NOXFRM; |
825 | struct net_vrf *vrf = netdev_priv(dev); |
826 | struct net *net = dev_net(dev); |
827 | struct rt6_info *rt6; |
828 | int rc = -ENOMEM; |
829 | |
830 | /* IPv6 can be CONFIG enabled and then disabled runtime */ |
831 | if (!ipv6_mod_enabled()) |
832 | return 0; |
833 | |
834 | vrf->fib6_table = fib6_new_table(net, id: vrf->tb_id); |
835 | if (!vrf->fib6_table) |
836 | goto out; |
837 | |
838 | /* create a dst for routing packets out a VRF device */ |
839 | rt6 = ip6_dst_alloc(net, dev, flags); |
840 | if (!rt6) |
841 | goto out; |
842 | |
843 | rt6->dst.output = vrf_output6; |
844 | |
845 | rcu_assign_pointer(vrf->rt6, rt6); |
846 | |
847 | rc = 0; |
848 | out: |
849 | return rc; |
850 | } |
851 | #else |
852 | static struct sk_buff *vrf_ip6_out(struct net_device *vrf_dev, |
853 | struct sock *sk, |
854 | struct sk_buff *skb) |
855 | { |
856 | return skb; |
857 | } |
858 | |
859 | static void vrf_rt6_release(struct net_device *dev, struct net_vrf *vrf) |
860 | { |
861 | } |
862 | |
863 | static int vrf_rt6_create(struct net_device *dev) |
864 | { |
865 | return 0; |
866 | } |
867 | #endif |
868 | |
869 | /* modelled after ip_finish_output2 */ |
870 | static int vrf_finish_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
871 | { |
872 | struct dst_entry *dst = skb_dst(skb); |
873 | struct rtable *rt = (struct rtable *)dst; |
874 | struct net_device *dev = dst->dev; |
875 | unsigned int hh_len = LL_RESERVED_SPACE(dev); |
876 | struct neighbour *neigh; |
877 | bool is_v6gw = false; |
878 | |
879 | vrf_nf_reset_ct(skb); |
880 | |
881 | /* Be paranoid, rather than too clever. */ |
882 | if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) { |
883 | skb = skb_expand_head(skb, headroom: hh_len); |
884 | if (!skb) { |
885 | dev->stats.tx_errors++; |
886 | return -ENOMEM; |
887 | } |
888 | } |
889 | |
890 | rcu_read_lock(); |
891 | |
892 | neigh = ip_neigh_for_gw(rt, skb, is_v6gw: &is_v6gw); |
893 | if (!IS_ERR(ptr: neigh)) { |
894 | int ret; |
895 | |
896 | sock_confirm_neigh(skb, n: neigh); |
897 | /* if crossing protocols, can not use the cached header */ |
898 | ret = neigh_output(n: neigh, skb, skip_cache: is_v6gw); |
899 | rcu_read_unlock(); |
900 | return ret; |
901 | } |
902 | |
903 | rcu_read_unlock(); |
904 | vrf_tx_error(vrf_dev: skb->dev, skb); |
905 | return -EINVAL; |
906 | } |
907 | |
908 | static int vrf_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
909 | { |
910 | struct net_device *dev = skb_dst(skb)->dev; |
911 | |
912 | IP_UPD_PO_STATS(net, IPSTATS_MIB_OUT, skb->len); |
913 | |
914 | skb->dev = dev; |
915 | skb->protocol = htons(ETH_P_IP); |
916 | |
917 | return NF_HOOK_COND(pf: NFPROTO_IPV4, hook: NF_INET_POST_ROUTING, |
918 | net, sk, skb, NULL, out: dev, |
919 | okfn: vrf_finish_output, |
920 | cond: !(IPCB(skb)->flags & IPSKB_REROUTED)); |
921 | } |
922 | |
923 | /* set dst on skb to send packet to us via dev_xmit path. Allows |
924 | * packet to go through device based features such as qdisc, netfilter |
925 | * hooks and packet sockets with skb->dev set to vrf device. |
926 | */ |
927 | static struct sk_buff *vrf_ip_out_redirect(struct net_device *vrf_dev, |
928 | struct sk_buff *skb) |
929 | { |
930 | struct net_vrf *vrf = netdev_priv(dev: vrf_dev); |
931 | struct dst_entry *dst = NULL; |
932 | struct rtable *rth; |
933 | |
934 | rcu_read_lock(); |
935 | |
936 | rth = rcu_dereference(vrf->rth); |
937 | if (likely(rth)) { |
938 | dst = &rth->dst; |
939 | dst_hold(dst); |
940 | } |
941 | |
942 | rcu_read_unlock(); |
943 | |
944 | if (unlikely(!dst)) { |
945 | vrf_tx_error(vrf_dev, skb); |
946 | return NULL; |
947 | } |
948 | |
949 | skb_dst_drop(skb); |
950 | skb_dst_set(skb, dst); |
951 | |
952 | return skb; |
953 | } |
954 | |
955 | static int vrf_output_direct_finish(struct net *net, struct sock *sk, |
956 | struct sk_buff *skb) |
957 | { |
958 | vrf_finish_direct(skb); |
959 | |
960 | return vrf_ip_local_out(net, sk, skb); |
961 | } |
962 | |
963 | static int vrf_output_direct(struct net *net, struct sock *sk, |
964 | struct sk_buff *skb) |
965 | { |
966 | int err = 1; |
967 | |
968 | skb->protocol = htons(ETH_P_IP); |
969 | |
970 | if (!(IPCB(skb)->flags & IPSKB_REROUTED)) |
971 | err = nf_hook(pf: NFPROTO_IPV4, hook: NF_INET_POST_ROUTING, net, sk, skb, |
972 | NULL, outdev: skb->dev, okfn: vrf_output_direct_finish); |
973 | |
974 | if (likely(err == 1)) |
975 | vrf_finish_direct(skb); |
976 | |
977 | return err; |
978 | } |
979 | |
980 | static int vrf_ip_out_direct_finish(struct net *net, struct sock *sk, |
981 | struct sk_buff *skb) |
982 | { |
983 | int err; |
984 | |
985 | err = vrf_output_direct(net, sk, skb); |
986 | if (likely(err == 1)) |
987 | err = vrf_ip_local_out(net, sk, skb); |
988 | |
989 | return err; |
990 | } |
991 | |
992 | static struct sk_buff *vrf_ip_out_direct(struct net_device *vrf_dev, |
993 | struct sock *sk, |
994 | struct sk_buff *skb) |
995 | { |
996 | struct net *net = dev_net(dev: vrf_dev); |
997 | int err; |
998 | |
999 | skb->dev = vrf_dev; |
1000 | |
1001 | err = nf_hook(pf: NFPROTO_IPV4, hook: NF_INET_LOCAL_OUT, net, sk, |
1002 | skb, NULL, outdev: vrf_dev, okfn: vrf_ip_out_direct_finish); |
1003 | |
1004 | if (likely(err == 1)) |
1005 | err = vrf_output_direct(net, sk, skb); |
1006 | |
1007 | if (likely(err == 1)) |
1008 | return skb; |
1009 | |
1010 | return NULL; |
1011 | } |
1012 | |
1013 | static struct sk_buff *vrf_ip_out(struct net_device *vrf_dev, |
1014 | struct sock *sk, |
1015 | struct sk_buff *skb) |
1016 | { |
1017 | /* don't divert multicast or local broadcast */ |
1018 | if (ipv4_is_multicast(addr: ip_hdr(skb)->daddr) || |
1019 | ipv4_is_lbcast(addr: ip_hdr(skb)->daddr)) |
1020 | return skb; |
1021 | |
1022 | vrf_nf_set_untracked(skb); |
1023 | |
1024 | if (qdisc_tx_is_default(dev: vrf_dev) || |
1025 | IPCB(skb)->flags & IPSKB_XFRM_TRANSFORMED) |
1026 | return vrf_ip_out_direct(vrf_dev, sk, skb); |
1027 | |
1028 | return vrf_ip_out_redirect(vrf_dev, skb); |
1029 | } |
1030 | |
1031 | /* called with rcu lock held */ |
1032 | static struct sk_buff *vrf_l3_out(struct net_device *vrf_dev, |
1033 | struct sock *sk, |
1034 | struct sk_buff *skb, |
1035 | u16 proto) |
1036 | { |
1037 | switch (proto) { |
1038 | case AF_INET: |
1039 | return vrf_ip_out(vrf_dev, sk, skb); |
1040 | case AF_INET6: |
1041 | return vrf_ip6_out(vrf_dev, sk, skb); |
1042 | } |
1043 | |
1044 | return skb; |
1045 | } |
1046 | |
1047 | /* holding rtnl */ |
1048 | static void vrf_rtable_release(struct net_device *dev, struct net_vrf *vrf) |
1049 | { |
1050 | struct rtable *rth = rtnl_dereference(vrf->rth); |
1051 | struct net *net = dev_net(dev); |
1052 | struct dst_entry *dst; |
1053 | |
1054 | RCU_INIT_POINTER(vrf->rth, NULL); |
1055 | synchronize_rcu(); |
1056 | |
1057 | /* move dev in dst's to loopback so this VRF device can be deleted |
1058 | * - based on dst_ifdown |
1059 | */ |
1060 | if (rth) { |
1061 | dst = &rth->dst; |
1062 | netdev_ref_replace(odev: dst->dev, ndev: net->loopback_dev, |
1063 | tracker: &dst->dev_tracker, GFP_KERNEL); |
1064 | dst->dev = net->loopback_dev; |
1065 | dst_release(dst); |
1066 | } |
1067 | } |
1068 | |
1069 | static int vrf_rtable_create(struct net_device *dev) |
1070 | { |
1071 | struct net_vrf *vrf = netdev_priv(dev); |
1072 | struct rtable *rth; |
1073 | |
1074 | if (!fib_new_table(net: dev_net(dev), id: vrf->tb_id)) |
1075 | return -ENOMEM; |
1076 | |
1077 | /* create a dst for routing packets out through a VRF device */ |
1078 | rth = rt_dst_alloc(dev, flags: 0, type: RTN_UNICAST, noxfrm: 1); |
1079 | if (!rth) |
1080 | return -ENOMEM; |
1081 | |
1082 | rth->dst.output = vrf_output; |
1083 | |
1084 | rcu_assign_pointer(vrf->rth, rth); |
1085 | |
1086 | return 0; |
1087 | } |
1088 | |
1089 | /**************************** device handling ********************/ |
1090 | |
1091 | /* cycle interface to flush neighbor cache and move routes across tables */ |
1092 | static void cycle_netdev(struct net_device *dev, |
1093 | struct netlink_ext_ack *extack) |
1094 | { |
1095 | unsigned int flags = dev->flags; |
1096 | int ret; |
1097 | |
1098 | if (!netif_running(dev)) |
1099 | return; |
1100 | |
1101 | ret = dev_change_flags(dev, flags: flags & ~IFF_UP, extack); |
1102 | if (ret >= 0) |
1103 | ret = dev_change_flags(dev, flags, extack); |
1104 | |
1105 | if (ret < 0) { |
1106 | netdev_err(dev, |
1107 | format: "Failed to cycle device %s; route tables might be wrong!\n" , |
1108 | dev->name); |
1109 | } |
1110 | } |
1111 | |
1112 | static int do_vrf_add_slave(struct net_device *dev, struct net_device *port_dev, |
1113 | struct netlink_ext_ack *extack) |
1114 | { |
1115 | int ret; |
1116 | |
1117 | /* do not allow loopback device to be enslaved to a VRF. |
1118 | * The vrf device acts as the loopback for the vrf. |
1119 | */ |
1120 | if (port_dev == dev_net(dev)->loopback_dev) { |
1121 | NL_SET_ERR_MSG(extack, |
1122 | "Can not enslave loopback device to a VRF" ); |
1123 | return -EOPNOTSUPP; |
1124 | } |
1125 | |
1126 | port_dev->priv_flags |= IFF_L3MDEV_SLAVE; |
1127 | ret = netdev_master_upper_dev_link(dev: port_dev, upper_dev: dev, NULL, NULL, extack); |
1128 | if (ret < 0) |
1129 | goto err; |
1130 | |
1131 | cycle_netdev(dev: port_dev, extack); |
1132 | |
1133 | return 0; |
1134 | |
1135 | err: |
1136 | port_dev->priv_flags &= ~IFF_L3MDEV_SLAVE; |
1137 | return ret; |
1138 | } |
1139 | |
1140 | static int vrf_add_slave(struct net_device *dev, struct net_device *port_dev, |
1141 | struct netlink_ext_ack *extack) |
1142 | { |
1143 | if (netif_is_l3_master(dev: port_dev)) { |
1144 | NL_SET_ERR_MSG(extack, |
1145 | "Can not enslave an L3 master device to a VRF" ); |
1146 | return -EINVAL; |
1147 | } |
1148 | |
1149 | if (netif_is_l3_slave(dev: port_dev)) |
1150 | return -EINVAL; |
1151 | |
1152 | return do_vrf_add_slave(dev, port_dev, extack); |
1153 | } |
1154 | |
1155 | /* inverse of do_vrf_add_slave */ |
1156 | static int do_vrf_del_slave(struct net_device *dev, struct net_device *port_dev) |
1157 | { |
1158 | netdev_upper_dev_unlink(dev: port_dev, upper_dev: dev); |
1159 | port_dev->priv_flags &= ~IFF_L3MDEV_SLAVE; |
1160 | |
1161 | cycle_netdev(dev: port_dev, NULL); |
1162 | |
1163 | return 0; |
1164 | } |
1165 | |
1166 | static int vrf_del_slave(struct net_device *dev, struct net_device *port_dev) |
1167 | { |
1168 | return do_vrf_del_slave(dev, port_dev); |
1169 | } |
1170 | |
1171 | static void vrf_dev_uninit(struct net_device *dev) |
1172 | { |
1173 | struct net_vrf *vrf = netdev_priv(dev); |
1174 | |
1175 | vrf_rtable_release(dev, vrf); |
1176 | vrf_rt6_release(dev, vrf); |
1177 | |
1178 | free_percpu(pdata: dev->dstats); |
1179 | dev->dstats = NULL; |
1180 | } |
1181 | |
1182 | static int vrf_dev_init(struct net_device *dev) |
1183 | { |
1184 | struct net_vrf *vrf = netdev_priv(dev); |
1185 | |
1186 | dev->dstats = netdev_alloc_pcpu_stats(struct pcpu_dstats); |
1187 | if (!dev->dstats) |
1188 | goto out_nomem; |
1189 | |
1190 | /* create the default dst which points back to us */ |
1191 | if (vrf_rtable_create(dev) != 0) |
1192 | goto out_stats; |
1193 | |
1194 | if (vrf_rt6_create(dev) != 0) |
1195 | goto out_rth; |
1196 | |
1197 | dev->flags = IFF_MASTER | IFF_NOARP; |
1198 | |
1199 | /* similarly, oper state is irrelevant; set to up to avoid confusion */ |
1200 | dev->operstate = IF_OPER_UP; |
1201 | netdev_lockdep_set_classes(dev); |
1202 | return 0; |
1203 | |
1204 | out_rth: |
1205 | vrf_rtable_release(dev, vrf); |
1206 | out_stats: |
1207 | free_percpu(pdata: dev->dstats); |
1208 | dev->dstats = NULL; |
1209 | out_nomem: |
1210 | return -ENOMEM; |
1211 | } |
1212 | |
1213 | static const struct net_device_ops vrf_netdev_ops = { |
1214 | .ndo_init = vrf_dev_init, |
1215 | .ndo_uninit = vrf_dev_uninit, |
1216 | .ndo_start_xmit = vrf_xmit, |
1217 | .ndo_set_mac_address = eth_mac_addr, |
1218 | .ndo_get_stats64 = vrf_get_stats64, |
1219 | .ndo_add_slave = vrf_add_slave, |
1220 | .ndo_del_slave = vrf_del_slave, |
1221 | }; |
1222 | |
1223 | static u32 vrf_fib_table(const struct net_device *dev) |
1224 | { |
1225 | struct net_vrf *vrf = netdev_priv(dev); |
1226 | |
1227 | return vrf->tb_id; |
1228 | } |
1229 | |
1230 | static int vrf_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb) |
1231 | { |
1232 | kfree_skb(skb); |
1233 | return 0; |
1234 | } |
1235 | |
1236 | static struct sk_buff *vrf_rcv_nfhook(u8 pf, unsigned int hook, |
1237 | struct sk_buff *skb, |
1238 | struct net_device *dev) |
1239 | { |
1240 | struct net *net = dev_net(dev); |
1241 | |
1242 | if (nf_hook(pf, hook, net, NULL, skb, indev: dev, NULL, okfn: vrf_rcv_finish) != 1) |
1243 | skb = NULL; /* kfree_skb(skb) handled by nf code */ |
1244 | |
1245 | return skb; |
1246 | } |
1247 | |
1248 | static int (struct sk_buff *skb, |
1249 | struct net_device *vrf_dev, u16 proto) |
1250 | { |
1251 | struct ethhdr *eth; |
1252 | int err; |
1253 | |
1254 | /* in general, we do not know if there is enough space in the head of |
1255 | * the packet for hosting the mac header. |
1256 | */ |
1257 | err = skb_cow_head(skb, LL_RESERVED_SPACE(vrf_dev)); |
1258 | if (unlikely(err)) |
1259 | /* no space in the skb head */ |
1260 | return -ENOBUFS; |
1261 | |
1262 | __skb_push(skb, ETH_HLEN); |
1263 | eth = (struct ethhdr *)skb->data; |
1264 | |
1265 | skb_reset_mac_header(skb); |
1266 | skb_reset_mac_len(skb); |
1267 | |
1268 | /* we set the ethernet destination and the source addresses to the |
1269 | * address of the VRF device. |
1270 | */ |
1271 | ether_addr_copy(dst: eth->h_dest, src: vrf_dev->dev_addr); |
1272 | ether_addr_copy(dst: eth->h_source, src: vrf_dev->dev_addr); |
1273 | eth->h_proto = htons(proto); |
1274 | |
1275 | /* the destination address of the Ethernet frame corresponds to the |
1276 | * address set on the VRF interface; therefore, the packet is intended |
1277 | * to be processed locally. |
1278 | */ |
1279 | skb->protocol = eth->h_proto; |
1280 | skb->pkt_type = PACKET_HOST; |
1281 | |
1282 | skb_postpush_rcsum(skb, start: skb->data, ETH_HLEN); |
1283 | |
1284 | skb_pull_inline(skb, ETH_HLEN); |
1285 | |
1286 | return 0; |
1287 | } |
1288 | |
1289 | /* prepare and add the mac header to the packet if it was not set previously. |
1290 | * In this way, packet sniffers such as tcpdump can parse the packet correctly. |
1291 | * If the mac header was already set, the original mac header is left |
1292 | * untouched and the function returns immediately. |
1293 | */ |
1294 | static int (struct sk_buff *skb, |
1295 | struct net_device *vrf_dev, |
1296 | u16 proto, struct net_device *orig_dev) |
1297 | { |
1298 | if (skb_mac_header_was_set(skb) && dev_has_header(dev: orig_dev)) |
1299 | return 0; |
1300 | |
1301 | return vrf_prepare_mac_header(skb, vrf_dev, proto); |
1302 | } |
1303 | |
1304 | #if IS_ENABLED(CONFIG_IPV6) |
1305 | /* neighbor handling is done with actual device; do not want |
1306 | * to flip skb->dev for those ndisc packets. This really fails |
1307 | * for multiple next protocols (e.g., NEXTHDR_HOP). But it is |
1308 | * a start. |
1309 | */ |
1310 | static bool ipv6_ndisc_frame(const struct sk_buff *skb) |
1311 | { |
1312 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
1313 | bool rc = false; |
1314 | |
1315 | if (iph->nexthdr == NEXTHDR_ICMP) { |
1316 | const struct icmp6hdr *icmph; |
1317 | struct icmp6hdr _icmph; |
1318 | |
1319 | icmph = skb_header_pointer(skb, offset: sizeof(*iph), |
1320 | len: sizeof(_icmph), buffer: &_icmph); |
1321 | if (!icmph) |
1322 | goto out; |
1323 | |
1324 | switch (icmph->icmp6_type) { |
1325 | case NDISC_ROUTER_SOLICITATION: |
1326 | case NDISC_ROUTER_ADVERTISEMENT: |
1327 | case NDISC_NEIGHBOUR_SOLICITATION: |
1328 | case NDISC_NEIGHBOUR_ADVERTISEMENT: |
1329 | case NDISC_REDIRECT: |
1330 | rc = true; |
1331 | break; |
1332 | } |
1333 | } |
1334 | |
1335 | out: |
1336 | return rc; |
1337 | } |
1338 | |
1339 | static struct rt6_info *vrf_ip6_route_lookup(struct net *net, |
1340 | const struct net_device *dev, |
1341 | struct flowi6 *fl6, |
1342 | int ifindex, |
1343 | const struct sk_buff *skb, |
1344 | int flags) |
1345 | { |
1346 | struct net_vrf *vrf = netdev_priv(dev); |
1347 | |
1348 | return ip6_pol_route(net, table: vrf->fib6_table, ifindex, fl6, skb, flags); |
1349 | } |
1350 | |
1351 | static void vrf_ip6_input_dst(struct sk_buff *skb, struct net_device *vrf_dev, |
1352 | int ifindex) |
1353 | { |
1354 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
1355 | struct flowi6 fl6 = { |
1356 | .flowi6_iif = ifindex, |
1357 | .flowi6_mark = skb->mark, |
1358 | .flowi6_proto = iph->nexthdr, |
1359 | .daddr = iph->daddr, |
1360 | .saddr = iph->saddr, |
1361 | .flowlabel = ip6_flowinfo(hdr: iph), |
1362 | }; |
1363 | struct net *net = dev_net(dev: vrf_dev); |
1364 | struct rt6_info *rt6; |
1365 | |
1366 | rt6 = vrf_ip6_route_lookup(net, dev: vrf_dev, fl6: &fl6, ifindex, skb, |
1367 | RT6_LOOKUP_F_HAS_SADDR | RT6_LOOKUP_F_IFACE); |
1368 | if (unlikely(!rt6)) |
1369 | return; |
1370 | |
1371 | if (unlikely(&rt6->dst == &net->ipv6.ip6_null_entry->dst)) |
1372 | return; |
1373 | |
1374 | skb_dst_set(skb, dst: &rt6->dst); |
1375 | } |
1376 | |
1377 | static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev, |
1378 | struct sk_buff *skb) |
1379 | { |
1380 | int orig_iif = skb->skb_iif; |
1381 | bool need_strict = rt6_need_strict(daddr: &ipv6_hdr(skb)->daddr); |
1382 | bool is_ndisc = ipv6_ndisc_frame(skb); |
1383 | |
1384 | /* loopback, multicast & non-ND link-local traffic; do not push through |
1385 | * packet taps again. Reset pkt_type for upper layers to process skb. |
1386 | * For non-loopback strict packets, determine the dst using the original |
1387 | * ifindex. |
1388 | */ |
1389 | if (skb->pkt_type == PACKET_LOOPBACK || (need_strict && !is_ndisc)) { |
1390 | skb->dev = vrf_dev; |
1391 | skb->skb_iif = vrf_dev->ifindex; |
1392 | IP6CB(skb)->flags |= IP6SKB_L3SLAVE; |
1393 | |
1394 | if (skb->pkt_type == PACKET_LOOPBACK) |
1395 | skb->pkt_type = PACKET_HOST; |
1396 | else |
1397 | vrf_ip6_input_dst(skb, vrf_dev, ifindex: orig_iif); |
1398 | |
1399 | goto out; |
1400 | } |
1401 | |
1402 | /* if packet is NDISC then keep the ingress interface */ |
1403 | if (!is_ndisc) { |
1404 | struct net_device *orig_dev = skb->dev; |
1405 | |
1406 | vrf_rx_stats(dev: vrf_dev, len: skb->len); |
1407 | skb->dev = vrf_dev; |
1408 | skb->skb_iif = vrf_dev->ifindex; |
1409 | |
1410 | if (!list_empty(head: &vrf_dev->ptype_all)) { |
1411 | int err; |
1412 | |
1413 | err = vrf_add_mac_header_if_unset(skb, vrf_dev, |
1414 | ETH_P_IPV6, |
1415 | orig_dev); |
1416 | if (likely(!err)) { |
1417 | skb_push(skb, len: skb->mac_len); |
1418 | dev_queue_xmit_nit(skb, dev: vrf_dev); |
1419 | skb_pull(skb, len: skb->mac_len); |
1420 | } |
1421 | } |
1422 | |
1423 | IP6CB(skb)->flags |= IP6SKB_L3SLAVE; |
1424 | } |
1425 | |
1426 | if (need_strict) |
1427 | vrf_ip6_input_dst(skb, vrf_dev, ifindex: orig_iif); |
1428 | |
1429 | skb = vrf_rcv_nfhook(pf: NFPROTO_IPV6, hook: NF_INET_PRE_ROUTING, skb, dev: vrf_dev); |
1430 | out: |
1431 | return skb; |
1432 | } |
1433 | |
1434 | #else |
1435 | static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev, |
1436 | struct sk_buff *skb) |
1437 | { |
1438 | return skb; |
1439 | } |
1440 | #endif |
1441 | |
1442 | static struct sk_buff *vrf_ip_rcv(struct net_device *vrf_dev, |
1443 | struct sk_buff *skb) |
1444 | { |
1445 | struct net_device *orig_dev = skb->dev; |
1446 | |
1447 | skb->dev = vrf_dev; |
1448 | skb->skb_iif = vrf_dev->ifindex; |
1449 | IPCB(skb)->flags |= IPSKB_L3SLAVE; |
1450 | |
1451 | if (ipv4_is_multicast(addr: ip_hdr(skb)->daddr)) |
1452 | goto out; |
1453 | |
1454 | /* loopback traffic; do not push through packet taps again. |
1455 | * Reset pkt_type for upper layers to process skb |
1456 | */ |
1457 | if (skb->pkt_type == PACKET_LOOPBACK) { |
1458 | skb->pkt_type = PACKET_HOST; |
1459 | goto out; |
1460 | } |
1461 | |
1462 | vrf_rx_stats(dev: vrf_dev, len: skb->len); |
1463 | |
1464 | if (!list_empty(head: &vrf_dev->ptype_all)) { |
1465 | int err; |
1466 | |
1467 | err = vrf_add_mac_header_if_unset(skb, vrf_dev, ETH_P_IP, |
1468 | orig_dev); |
1469 | if (likely(!err)) { |
1470 | skb_push(skb, len: skb->mac_len); |
1471 | dev_queue_xmit_nit(skb, dev: vrf_dev); |
1472 | skb_pull(skb, len: skb->mac_len); |
1473 | } |
1474 | } |
1475 | |
1476 | skb = vrf_rcv_nfhook(pf: NFPROTO_IPV4, hook: NF_INET_PRE_ROUTING, skb, dev: vrf_dev); |
1477 | out: |
1478 | return skb; |
1479 | } |
1480 | |
1481 | /* called with rcu lock held */ |
1482 | static struct sk_buff *vrf_l3_rcv(struct net_device *vrf_dev, |
1483 | struct sk_buff *skb, |
1484 | u16 proto) |
1485 | { |
1486 | switch (proto) { |
1487 | case AF_INET: |
1488 | return vrf_ip_rcv(vrf_dev, skb); |
1489 | case AF_INET6: |
1490 | return vrf_ip6_rcv(vrf_dev, skb); |
1491 | } |
1492 | |
1493 | return skb; |
1494 | } |
1495 | |
1496 | #if IS_ENABLED(CONFIG_IPV6) |
1497 | /* send to link-local or multicast address via interface enslaved to |
1498 | * VRF device. Force lookup to VRF table without changing flow struct |
1499 | * Note: Caller to this function must hold rcu_read_lock() and no refcnt |
1500 | * is taken on the dst by this function. |
1501 | */ |
1502 | static struct dst_entry *vrf_link_scope_lookup(const struct net_device *dev, |
1503 | struct flowi6 *fl6) |
1504 | { |
1505 | struct net *net = dev_net(dev); |
1506 | int flags = RT6_LOOKUP_F_IFACE | RT6_LOOKUP_F_DST_NOREF; |
1507 | struct dst_entry *dst = NULL; |
1508 | struct rt6_info *rt; |
1509 | |
1510 | /* VRF device does not have a link-local address and |
1511 | * sending packets to link-local or mcast addresses over |
1512 | * a VRF device does not make sense |
1513 | */ |
1514 | if (fl6->flowi6_oif == dev->ifindex) { |
1515 | dst = &net->ipv6.ip6_null_entry->dst; |
1516 | return dst; |
1517 | } |
1518 | |
1519 | if (!ipv6_addr_any(a: &fl6->saddr)) |
1520 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
1521 | |
1522 | rt = vrf_ip6_route_lookup(net, dev, fl6, ifindex: fl6->flowi6_oif, NULL, flags); |
1523 | if (rt) |
1524 | dst = &rt->dst; |
1525 | |
1526 | return dst; |
1527 | } |
1528 | #endif |
1529 | |
1530 | static const struct l3mdev_ops vrf_l3mdev_ops = { |
1531 | .l3mdev_fib_table = vrf_fib_table, |
1532 | .l3mdev_l3_rcv = vrf_l3_rcv, |
1533 | .l3mdev_l3_out = vrf_l3_out, |
1534 | #if IS_ENABLED(CONFIG_IPV6) |
1535 | .l3mdev_link_scope_lookup = vrf_link_scope_lookup, |
1536 | #endif |
1537 | }; |
1538 | |
1539 | static void vrf_get_drvinfo(struct net_device *dev, |
1540 | struct ethtool_drvinfo *info) |
1541 | { |
1542 | strscpy(p: info->driver, DRV_NAME, size: sizeof(info->driver)); |
1543 | strscpy(p: info->version, DRV_VERSION, size: sizeof(info->version)); |
1544 | } |
1545 | |
1546 | static const struct ethtool_ops vrf_ethtool_ops = { |
1547 | .get_drvinfo = vrf_get_drvinfo, |
1548 | }; |
1549 | |
1550 | static inline size_t vrf_fib_rule_nl_size(void) |
1551 | { |
1552 | size_t sz; |
1553 | |
1554 | sz = NLMSG_ALIGN(sizeof(struct fib_rule_hdr)); |
1555 | sz += nla_total_size(payload: sizeof(u8)); /* FRA_L3MDEV */ |
1556 | sz += nla_total_size(payload: sizeof(u32)); /* FRA_PRIORITY */ |
1557 | sz += nla_total_size(payload: sizeof(u8)); /* FRA_PROTOCOL */ |
1558 | |
1559 | return sz; |
1560 | } |
1561 | |
1562 | static int vrf_fib_rule(const struct net_device *dev, __u8 family, bool add_it) |
1563 | { |
1564 | struct fib_rule_hdr *frh; |
1565 | struct nlmsghdr *nlh; |
1566 | struct sk_buff *skb; |
1567 | int err; |
1568 | |
1569 | if ((family == AF_INET6 || family == RTNL_FAMILY_IP6MR) && |
1570 | !ipv6_mod_enabled()) |
1571 | return 0; |
1572 | |
1573 | skb = nlmsg_new(payload: vrf_fib_rule_nl_size(), GFP_KERNEL); |
1574 | if (!skb) |
1575 | return -ENOMEM; |
1576 | |
1577 | nlh = nlmsg_put(skb, portid: 0, seq: 0, type: 0, payload: sizeof(*frh), flags: 0); |
1578 | if (!nlh) |
1579 | goto nla_put_failure; |
1580 | |
1581 | /* rule only needs to appear once */ |
1582 | nlh->nlmsg_flags |= NLM_F_EXCL; |
1583 | |
1584 | frh = nlmsg_data(nlh); |
1585 | memset(frh, 0, sizeof(*frh)); |
1586 | frh->family = family; |
1587 | frh->action = FR_ACT_TO_TBL; |
1588 | |
1589 | if (nla_put_u8(skb, attrtype: FRA_PROTOCOL, RTPROT_KERNEL)) |
1590 | goto nla_put_failure; |
1591 | |
1592 | if (nla_put_u8(skb, attrtype: FRA_L3MDEV, value: 1)) |
1593 | goto nla_put_failure; |
1594 | |
1595 | if (nla_put_u32(skb, attrtype: FRA_PRIORITY, FIB_RULE_PREF)) |
1596 | goto nla_put_failure; |
1597 | |
1598 | nlmsg_end(skb, nlh); |
1599 | |
1600 | /* fib_nl_{new,del}rule handling looks for net from skb->sk */ |
1601 | skb->sk = dev_net(dev)->rtnl; |
1602 | if (add_it) { |
1603 | err = fib_nl_newrule(skb, nlh, NULL); |
1604 | if (err == -EEXIST) |
1605 | err = 0; |
1606 | } else { |
1607 | err = fib_nl_delrule(skb, nlh, NULL); |
1608 | if (err == -ENOENT) |
1609 | err = 0; |
1610 | } |
1611 | nlmsg_free(skb); |
1612 | |
1613 | return err; |
1614 | |
1615 | nla_put_failure: |
1616 | nlmsg_free(skb); |
1617 | |
1618 | return -EMSGSIZE; |
1619 | } |
1620 | |
1621 | static int vrf_add_fib_rules(const struct net_device *dev) |
1622 | { |
1623 | int err; |
1624 | |
1625 | err = vrf_fib_rule(dev, AF_INET, add_it: true); |
1626 | if (err < 0) |
1627 | goto out_err; |
1628 | |
1629 | err = vrf_fib_rule(dev, AF_INET6, add_it: true); |
1630 | if (err < 0) |
1631 | goto ipv6_err; |
1632 | |
1633 | #if IS_ENABLED(CONFIG_IP_MROUTE_MULTIPLE_TABLES) |
1634 | err = vrf_fib_rule(dev, RTNL_FAMILY_IPMR, add_it: true); |
1635 | if (err < 0) |
1636 | goto ipmr_err; |
1637 | #endif |
1638 | |
1639 | #if IS_ENABLED(CONFIG_IPV6_MROUTE_MULTIPLE_TABLES) |
1640 | err = vrf_fib_rule(dev, RTNL_FAMILY_IP6MR, add_it: true); |
1641 | if (err < 0) |
1642 | goto ip6mr_err; |
1643 | #endif |
1644 | |
1645 | return 0; |
1646 | |
1647 | #if IS_ENABLED(CONFIG_IPV6_MROUTE_MULTIPLE_TABLES) |
1648 | ip6mr_err: |
1649 | vrf_fib_rule(dev, RTNL_FAMILY_IPMR, add_it: false); |
1650 | #endif |
1651 | |
1652 | #if IS_ENABLED(CONFIG_IP_MROUTE_MULTIPLE_TABLES) |
1653 | ipmr_err: |
1654 | vrf_fib_rule(dev, AF_INET6, add_it: false); |
1655 | #endif |
1656 | |
1657 | ipv6_err: |
1658 | vrf_fib_rule(dev, AF_INET, add_it: false); |
1659 | |
1660 | out_err: |
1661 | netdev_err(dev, format: "Failed to add FIB rules.\n" ); |
1662 | return err; |
1663 | } |
1664 | |
1665 | static void vrf_setup(struct net_device *dev) |
1666 | { |
1667 | ether_setup(dev); |
1668 | |
1669 | /* Initialize the device structure. */ |
1670 | dev->netdev_ops = &vrf_netdev_ops; |
1671 | dev->l3mdev_ops = &vrf_l3mdev_ops; |
1672 | dev->ethtool_ops = &vrf_ethtool_ops; |
1673 | dev->needs_free_netdev = true; |
1674 | |
1675 | /* Fill in device structure with ethernet-generic values. */ |
1676 | eth_hw_addr_random(dev); |
1677 | |
1678 | /* don't acquire vrf device's netif_tx_lock when transmitting */ |
1679 | dev->features |= NETIF_F_LLTX; |
1680 | |
1681 | /* don't allow vrf devices to change network namespaces. */ |
1682 | dev->features |= NETIF_F_NETNS_LOCAL; |
1683 | |
1684 | /* does not make sense for a VLAN to be added to a vrf device */ |
1685 | dev->features |= NETIF_F_VLAN_CHALLENGED; |
1686 | |
1687 | /* enable offload features */ |
1688 | dev->features |= NETIF_F_GSO_SOFTWARE; |
1689 | dev->features |= NETIF_F_RXCSUM | NETIF_F_HW_CSUM | NETIF_F_SCTP_CRC; |
1690 | dev->features |= NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA; |
1691 | |
1692 | dev->hw_features = dev->features; |
1693 | dev->hw_enc_features = dev->features; |
1694 | |
1695 | /* default to no qdisc; user can add if desired */ |
1696 | dev->priv_flags |= IFF_NO_QUEUE; |
1697 | dev->priv_flags |= IFF_NO_RX_HANDLER; |
1698 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
1699 | |
1700 | /* VRF devices do not care about MTU, but if the MTU is set |
1701 | * too low then the ipv4 and ipv6 protocols are disabled |
1702 | * which breaks networking. |
1703 | */ |
1704 | dev->min_mtu = IPV6_MIN_MTU; |
1705 | dev->max_mtu = IP6_MAX_MTU; |
1706 | dev->mtu = dev->max_mtu; |
1707 | } |
1708 | |
1709 | static int vrf_validate(struct nlattr *tb[], struct nlattr *data[], |
1710 | struct netlink_ext_ack *extack) |
1711 | { |
1712 | if (tb[IFLA_ADDRESS]) { |
1713 | if (nla_len(nla: tb[IFLA_ADDRESS]) != ETH_ALEN) { |
1714 | NL_SET_ERR_MSG(extack, "Invalid hardware address" ); |
1715 | return -EINVAL; |
1716 | } |
1717 | if (!is_valid_ether_addr(addr: nla_data(nla: tb[IFLA_ADDRESS]))) { |
1718 | NL_SET_ERR_MSG(extack, "Invalid hardware address" ); |
1719 | return -EADDRNOTAVAIL; |
1720 | } |
1721 | } |
1722 | return 0; |
1723 | } |
1724 | |
1725 | static void vrf_dellink(struct net_device *dev, struct list_head *head) |
1726 | { |
1727 | struct net_device *port_dev; |
1728 | struct list_head *iter; |
1729 | |
1730 | netdev_for_each_lower_dev(dev, port_dev, iter) |
1731 | vrf_del_slave(dev, port_dev); |
1732 | |
1733 | vrf_map_unregister_dev(dev); |
1734 | |
1735 | unregister_netdevice_queue(dev, head); |
1736 | } |
1737 | |
1738 | static int vrf_newlink(struct net *src_net, struct net_device *dev, |
1739 | struct nlattr *tb[], struct nlattr *data[], |
1740 | struct netlink_ext_ack *extack) |
1741 | { |
1742 | struct net_vrf *vrf = netdev_priv(dev); |
1743 | struct netns_vrf *nn_vrf; |
1744 | bool *add_fib_rules; |
1745 | struct net *net; |
1746 | int err; |
1747 | |
1748 | if (!data || !data[IFLA_VRF_TABLE]) { |
1749 | NL_SET_ERR_MSG(extack, "VRF table id is missing" ); |
1750 | return -EINVAL; |
1751 | } |
1752 | |
1753 | vrf->tb_id = nla_get_u32(nla: data[IFLA_VRF_TABLE]); |
1754 | if (vrf->tb_id == RT_TABLE_UNSPEC) { |
1755 | NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VRF_TABLE], |
1756 | "Invalid VRF table id" ); |
1757 | return -EINVAL; |
1758 | } |
1759 | |
1760 | dev->priv_flags |= IFF_L3MDEV_MASTER; |
1761 | |
1762 | err = register_netdevice(dev); |
1763 | if (err) |
1764 | goto out; |
1765 | |
1766 | /* mapping between table_id and vrf; |
1767 | * note: such binding could not be done in the dev init function |
1768 | * because dev->ifindex id is not available yet. |
1769 | */ |
1770 | vrf->ifindex = dev->ifindex; |
1771 | |
1772 | err = vrf_map_register_dev(dev, extack); |
1773 | if (err) { |
1774 | unregister_netdevice(dev); |
1775 | goto out; |
1776 | } |
1777 | |
1778 | net = dev_net(dev); |
1779 | nn_vrf = net_generic(net, id: vrf_net_id); |
1780 | |
1781 | add_fib_rules = &nn_vrf->add_fib_rules; |
1782 | if (*add_fib_rules) { |
1783 | err = vrf_add_fib_rules(dev); |
1784 | if (err) { |
1785 | vrf_map_unregister_dev(dev); |
1786 | unregister_netdevice(dev); |
1787 | goto out; |
1788 | } |
1789 | *add_fib_rules = false; |
1790 | } |
1791 | |
1792 | out: |
1793 | return err; |
1794 | } |
1795 | |
1796 | static size_t vrf_nl_getsize(const struct net_device *dev) |
1797 | { |
1798 | return nla_total_size(payload: sizeof(u32)); /* IFLA_VRF_TABLE */ |
1799 | } |
1800 | |
1801 | static int vrf_fillinfo(struct sk_buff *skb, |
1802 | const struct net_device *dev) |
1803 | { |
1804 | struct net_vrf *vrf = netdev_priv(dev); |
1805 | |
1806 | return nla_put_u32(skb, attrtype: IFLA_VRF_TABLE, value: vrf->tb_id); |
1807 | } |
1808 | |
1809 | static size_t vrf_get_slave_size(const struct net_device *bond_dev, |
1810 | const struct net_device *slave_dev) |
1811 | { |
1812 | return nla_total_size(payload: sizeof(u32)); /* IFLA_VRF_PORT_TABLE */ |
1813 | } |
1814 | |
1815 | static int vrf_fill_slave_info(struct sk_buff *skb, |
1816 | const struct net_device *vrf_dev, |
1817 | const struct net_device *slave_dev) |
1818 | { |
1819 | struct net_vrf *vrf = netdev_priv(dev: vrf_dev); |
1820 | |
1821 | if (nla_put_u32(skb, attrtype: IFLA_VRF_PORT_TABLE, value: vrf->tb_id)) |
1822 | return -EMSGSIZE; |
1823 | |
1824 | return 0; |
1825 | } |
1826 | |
1827 | static const struct nla_policy vrf_nl_policy[IFLA_VRF_MAX + 1] = { |
1828 | [IFLA_VRF_TABLE] = { .type = NLA_U32 }, |
1829 | }; |
1830 | |
1831 | static struct rtnl_link_ops vrf_link_ops __read_mostly = { |
1832 | .kind = DRV_NAME, |
1833 | .priv_size = sizeof(struct net_vrf), |
1834 | |
1835 | .get_size = vrf_nl_getsize, |
1836 | .policy = vrf_nl_policy, |
1837 | .validate = vrf_validate, |
1838 | .fill_info = vrf_fillinfo, |
1839 | |
1840 | .get_slave_size = vrf_get_slave_size, |
1841 | .fill_slave_info = vrf_fill_slave_info, |
1842 | |
1843 | .newlink = vrf_newlink, |
1844 | .dellink = vrf_dellink, |
1845 | .setup = vrf_setup, |
1846 | .maxtype = IFLA_VRF_MAX, |
1847 | }; |
1848 | |
1849 | static int vrf_device_event(struct notifier_block *unused, |
1850 | unsigned long event, void *ptr) |
1851 | { |
1852 | struct net_device *dev = netdev_notifier_info_to_dev(info: ptr); |
1853 | |
1854 | /* only care about unregister events to drop slave references */ |
1855 | if (event == NETDEV_UNREGISTER) { |
1856 | struct net_device *vrf_dev; |
1857 | |
1858 | if (!netif_is_l3_slave(dev)) |
1859 | goto out; |
1860 | |
1861 | vrf_dev = netdev_master_upper_dev_get(dev); |
1862 | vrf_del_slave(dev: vrf_dev, port_dev: dev); |
1863 | } |
1864 | out: |
1865 | return NOTIFY_DONE; |
1866 | } |
1867 | |
1868 | static struct notifier_block vrf_notifier_block __read_mostly = { |
1869 | .notifier_call = vrf_device_event, |
1870 | }; |
1871 | |
1872 | static int vrf_map_init(struct vrf_map *vmap) |
1873 | { |
1874 | spin_lock_init(&vmap->vmap_lock); |
1875 | hash_init(vmap->ht); |
1876 | |
1877 | vmap->strict_mode = false; |
1878 | |
1879 | return 0; |
1880 | } |
1881 | |
1882 | #ifdef CONFIG_SYSCTL |
1883 | static bool vrf_strict_mode(struct vrf_map *vmap) |
1884 | { |
1885 | bool strict_mode; |
1886 | |
1887 | vrf_map_lock(vmap); |
1888 | strict_mode = vmap->strict_mode; |
1889 | vrf_map_unlock(vmap); |
1890 | |
1891 | return strict_mode; |
1892 | } |
1893 | |
1894 | static int vrf_strict_mode_change(struct vrf_map *vmap, bool new_mode) |
1895 | { |
1896 | bool *cur_mode; |
1897 | int res = 0; |
1898 | |
1899 | vrf_map_lock(vmap); |
1900 | |
1901 | cur_mode = &vmap->strict_mode; |
1902 | if (*cur_mode == new_mode) |
1903 | goto unlock; |
1904 | |
1905 | if (*cur_mode) { |
1906 | /* disable strict mode */ |
1907 | *cur_mode = false; |
1908 | } else { |
1909 | if (vmap->shared_tables) { |
1910 | /* we cannot allow strict_mode because there are some |
1911 | * vrfs that share one or more tables. |
1912 | */ |
1913 | res = -EBUSY; |
1914 | goto unlock; |
1915 | } |
1916 | |
1917 | /* no tables are shared among vrfs, so we can go back |
1918 | * to 1:1 association between a vrf with its table. |
1919 | */ |
1920 | *cur_mode = true; |
1921 | } |
1922 | |
1923 | unlock: |
1924 | vrf_map_unlock(vmap); |
1925 | |
1926 | return res; |
1927 | } |
1928 | |
1929 | static int vrf_shared_table_handler(struct ctl_table *table, int write, |
1930 | void *buffer, size_t *lenp, loff_t *ppos) |
1931 | { |
1932 | struct net *net = (struct net *)table->extra1; |
1933 | struct vrf_map *vmap = netns_vrf_map(net); |
1934 | int proc_strict_mode = 0; |
1935 | struct ctl_table tmp = { |
1936 | .procname = table->procname, |
1937 | .data = &proc_strict_mode, |
1938 | .maxlen = sizeof(int), |
1939 | .mode = table->mode, |
1940 | .extra1 = SYSCTL_ZERO, |
1941 | .extra2 = SYSCTL_ONE, |
1942 | }; |
1943 | int ret; |
1944 | |
1945 | if (!write) |
1946 | proc_strict_mode = vrf_strict_mode(vmap); |
1947 | |
1948 | ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); |
1949 | |
1950 | if (write && ret == 0) |
1951 | ret = vrf_strict_mode_change(vmap, new_mode: (bool)proc_strict_mode); |
1952 | |
1953 | return ret; |
1954 | } |
1955 | |
1956 | static const struct ctl_table vrf_table[] = { |
1957 | { |
1958 | .procname = "strict_mode" , |
1959 | .data = NULL, |
1960 | .maxlen = sizeof(int), |
1961 | .mode = 0644, |
1962 | .proc_handler = vrf_shared_table_handler, |
1963 | /* set by the vrf_netns_init */ |
1964 | .extra1 = NULL, |
1965 | }, |
1966 | }; |
1967 | |
1968 | static int vrf_netns_init_sysctl(struct net *net, struct netns_vrf *nn_vrf) |
1969 | { |
1970 | struct ctl_table *table; |
1971 | |
1972 | table = kmemdup(p: vrf_table, size: sizeof(vrf_table), GFP_KERNEL); |
1973 | if (!table) |
1974 | return -ENOMEM; |
1975 | |
1976 | /* init the extra1 parameter with the reference to current netns */ |
1977 | table[0].extra1 = net; |
1978 | |
1979 | nn_vrf->ctl_hdr = register_net_sysctl_sz(net, path: "net/vrf" , table, |
1980 | ARRAY_SIZE(vrf_table)); |
1981 | if (!nn_vrf->ctl_hdr) { |
1982 | kfree(objp: table); |
1983 | return -ENOMEM; |
1984 | } |
1985 | |
1986 | return 0; |
1987 | } |
1988 | |
1989 | static void vrf_netns_exit_sysctl(struct net *net) |
1990 | { |
1991 | struct netns_vrf *nn_vrf = net_generic(net, id: vrf_net_id); |
1992 | struct ctl_table *table; |
1993 | |
1994 | table = nn_vrf->ctl_hdr->ctl_table_arg; |
1995 | unregister_net_sysctl_table(header: nn_vrf->ctl_hdr); |
1996 | kfree(objp: table); |
1997 | } |
1998 | #else |
1999 | static int vrf_netns_init_sysctl(struct net *net, struct netns_vrf *nn_vrf) |
2000 | { |
2001 | return 0; |
2002 | } |
2003 | |
2004 | static void vrf_netns_exit_sysctl(struct net *net) |
2005 | { |
2006 | } |
2007 | #endif |
2008 | |
2009 | /* Initialize per network namespace state */ |
2010 | static int __net_init vrf_netns_init(struct net *net) |
2011 | { |
2012 | struct netns_vrf *nn_vrf = net_generic(net, id: vrf_net_id); |
2013 | |
2014 | nn_vrf->add_fib_rules = true; |
2015 | vrf_map_init(vmap: &nn_vrf->vmap); |
2016 | |
2017 | return vrf_netns_init_sysctl(net, nn_vrf); |
2018 | } |
2019 | |
2020 | static void __net_exit vrf_netns_exit(struct net *net) |
2021 | { |
2022 | vrf_netns_exit_sysctl(net); |
2023 | } |
2024 | |
2025 | static struct pernet_operations vrf_net_ops __net_initdata = { |
2026 | .init = vrf_netns_init, |
2027 | .exit = vrf_netns_exit, |
2028 | .id = &vrf_net_id, |
2029 | .size = sizeof(struct netns_vrf), |
2030 | }; |
2031 | |
2032 | static int __init vrf_init_module(void) |
2033 | { |
2034 | int rc; |
2035 | |
2036 | register_netdevice_notifier(nb: &vrf_notifier_block); |
2037 | |
2038 | rc = register_pernet_subsys(&vrf_net_ops); |
2039 | if (rc < 0) |
2040 | goto error; |
2041 | |
2042 | rc = l3mdev_table_lookup_register(l3type: L3MDEV_TYPE_VRF, |
2043 | fn: vrf_ifindex_lookup_by_table_id); |
2044 | if (rc < 0) |
2045 | goto unreg_pernet; |
2046 | |
2047 | rc = rtnl_link_register(ops: &vrf_link_ops); |
2048 | if (rc < 0) |
2049 | goto table_lookup_unreg; |
2050 | |
2051 | return 0; |
2052 | |
2053 | table_lookup_unreg: |
2054 | l3mdev_table_lookup_unregister(l3type: L3MDEV_TYPE_VRF, |
2055 | fn: vrf_ifindex_lookup_by_table_id); |
2056 | |
2057 | unreg_pernet: |
2058 | unregister_pernet_subsys(&vrf_net_ops); |
2059 | |
2060 | error: |
2061 | unregister_netdevice_notifier(nb: &vrf_notifier_block); |
2062 | return rc; |
2063 | } |
2064 | |
2065 | module_init(vrf_init_module); |
2066 | MODULE_AUTHOR("Shrijeet Mukherjee, David Ahern" ); |
2067 | MODULE_DESCRIPTION("Device driver to instantiate VRF domains" ); |
2068 | MODULE_LICENSE("GPL" ); |
2069 | MODULE_ALIAS_RTNL_LINK(DRV_NAME); |
2070 | MODULE_VERSION(DRV_VERSION); |
2071 | |