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Merge tag 'for-linus-4.15-rc5-tag' of git://git.kernel.org/pub/scm/linux/kernel/git...
[mirror_ubuntu-bionic-kernel.git] / net / ipv4 / fib_frontend.c
1 /*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * IPv4 Forwarding Information Base: FIB frontend.
7 *
8 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
14 */
15
16 #include <linux/module.h>
17 #include <linux/uaccess.h>
18 #include <linux/bitops.h>
19 #include <linux/capability.h>
20 #include <linux/types.h>
21 #include <linux/kernel.h>
22 #include <linux/mm.h>
23 #include <linux/string.h>
24 #include <linux/socket.h>
25 #include <linux/sockios.h>
26 #include <linux/errno.h>
27 #include <linux/in.h>
28 #include <linux/inet.h>
29 #include <linux/inetdevice.h>
30 #include <linux/netdevice.h>
31 #include <linux/if_addr.h>
32 #include <linux/if_arp.h>
33 #include <linux/skbuff.h>
34 #include <linux/cache.h>
35 #include <linux/init.h>
36 #include <linux/list.h>
37 #include <linux/slab.h>
38
39 #include <net/ip.h>
40 #include <net/protocol.h>
41 #include <net/route.h>
42 #include <net/tcp.h>
43 #include <net/sock.h>
44 #include <net/arp.h>
45 #include <net/ip_fib.h>
46 #include <net/rtnetlink.h>
47 #include <net/xfrm.h>
48 #include <net/l3mdev.h>
49 #include <net/lwtunnel.h>
50 #include <trace/events/fib.h>
51
52 #ifndef CONFIG_IP_MULTIPLE_TABLES
53
54 static int __net_init fib4_rules_init(struct net *net)
55 {
56 struct fib_table *local_table, *main_table;
57
58 main_table = fib_trie_table(RT_TABLE_MAIN, NULL);
59 if (!main_table)
60 return -ENOMEM;
61
62 local_table = fib_trie_table(RT_TABLE_LOCAL, main_table);
63 if (!local_table)
64 goto fail;
65
66 hlist_add_head_rcu(&local_table->tb_hlist,
67 &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX]);
68 hlist_add_head_rcu(&main_table->tb_hlist,
69 &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX]);
70 return 0;
71
72 fail:
73 fib_free_table(main_table);
74 return -ENOMEM;
75 }
76
77 static bool fib4_has_custom_rules(struct net *net)
78 {
79 return false;
80 }
81 #else
82
83 struct fib_table *fib_new_table(struct net *net, u32 id)
84 {
85 struct fib_table *tb, *alias = NULL;
86 unsigned int h;
87
88 if (id == 0)
89 id = RT_TABLE_MAIN;
90 tb = fib_get_table(net, id);
91 if (tb)
92 return tb;
93
94 if (id == RT_TABLE_LOCAL && !net->ipv4.fib_has_custom_rules)
95 alias = fib_new_table(net, RT_TABLE_MAIN);
96
97 tb = fib_trie_table(id, alias);
98 if (!tb)
99 return NULL;
100
101 switch (id) {
102 case RT_TABLE_MAIN:
103 rcu_assign_pointer(net->ipv4.fib_main, tb);
104 break;
105 case RT_TABLE_DEFAULT:
106 rcu_assign_pointer(net->ipv4.fib_default, tb);
107 break;
108 default:
109 break;
110 }
111
112 h = id & (FIB_TABLE_HASHSZ - 1);
113 hlist_add_head_rcu(&tb->tb_hlist, &net->ipv4.fib_table_hash[h]);
114 return tb;
115 }
116 EXPORT_SYMBOL_GPL(fib_new_table);
117
118 /* caller must hold either rtnl or rcu read lock */
119 struct fib_table *fib_get_table(struct net *net, u32 id)
120 {
121 struct fib_table *tb;
122 struct hlist_head *head;
123 unsigned int h;
124
125 if (id == 0)
126 id = RT_TABLE_MAIN;
127 h = id & (FIB_TABLE_HASHSZ - 1);
128
129 head = &net->ipv4.fib_table_hash[h];
130 hlist_for_each_entry_rcu(tb, head, tb_hlist) {
131 if (tb->tb_id == id)
132 return tb;
133 }
134 return NULL;
135 }
136
137 static bool fib4_has_custom_rules(struct net *net)
138 {
139 return net->ipv4.fib_has_custom_rules;
140 }
141 #endif /* CONFIG_IP_MULTIPLE_TABLES */
142
143 static void fib_replace_table(struct net *net, struct fib_table *old,
144 struct fib_table *new)
145 {
146 #ifdef CONFIG_IP_MULTIPLE_TABLES
147 switch (new->tb_id) {
148 case RT_TABLE_MAIN:
149 rcu_assign_pointer(net->ipv4.fib_main, new);
150 break;
151 case RT_TABLE_DEFAULT:
152 rcu_assign_pointer(net->ipv4.fib_default, new);
153 break;
154 default:
155 break;
156 }
157
158 #endif
159 /* replace the old table in the hlist */
160 hlist_replace_rcu(&old->tb_hlist, &new->tb_hlist);
161 }
162
163 int fib_unmerge(struct net *net)
164 {
165 struct fib_table *old, *new, *main_table;
166
167 /* attempt to fetch local table if it has been allocated */
168 old = fib_get_table(net, RT_TABLE_LOCAL);
169 if (!old)
170 return 0;
171
172 new = fib_trie_unmerge(old);
173 if (!new)
174 return -ENOMEM;
175
176 /* table is already unmerged */
177 if (new == old)
178 return 0;
179
180 /* replace merged table with clean table */
181 fib_replace_table(net, old, new);
182 fib_free_table(old);
183
184 /* attempt to fetch main table if it has been allocated */
185 main_table = fib_get_table(net, RT_TABLE_MAIN);
186 if (!main_table)
187 return 0;
188
189 /* flush local entries from main table */
190 fib_table_flush_external(main_table);
191
192 return 0;
193 }
194
195 static void fib_flush(struct net *net)
196 {
197 int flushed = 0;
198 unsigned int h;
199
200 for (h = 0; h < FIB_TABLE_HASHSZ; h++) {
201 struct hlist_head *head = &net->ipv4.fib_table_hash[h];
202 struct hlist_node *tmp;
203 struct fib_table *tb;
204
205 hlist_for_each_entry_safe(tb, tmp, head, tb_hlist)
206 flushed += fib_table_flush(net, tb);
207 }
208
209 if (flushed)
210 rt_cache_flush(net);
211 }
212
213 /*
214 * Find address type as if only "dev" was present in the system. If
215 * on_dev is NULL then all interfaces are taken into consideration.
216 */
217 static inline unsigned int __inet_dev_addr_type(struct net *net,
218 const struct net_device *dev,
219 __be32 addr, u32 tb_id)
220 {
221 struct flowi4 fl4 = { .daddr = addr };
222 struct fib_result res;
223 unsigned int ret = RTN_BROADCAST;
224 struct fib_table *table;
225
226 if (ipv4_is_zeronet(addr) || ipv4_is_lbcast(addr))
227 return RTN_BROADCAST;
228 if (ipv4_is_multicast(addr))
229 return RTN_MULTICAST;
230
231 rcu_read_lock();
232
233 table = fib_get_table(net, tb_id);
234 if (table) {
235 ret = RTN_UNICAST;
236 if (!fib_table_lookup(table, &fl4, &res, FIB_LOOKUP_NOREF)) {
237 if (!dev || dev == res.fi->fib_dev)
238 ret = res.type;
239 }
240 }
241
242 rcu_read_unlock();
243 return ret;
244 }
245
246 unsigned int inet_addr_type_table(struct net *net, __be32 addr, u32 tb_id)
247 {
248 return __inet_dev_addr_type(net, NULL, addr, tb_id);
249 }
250 EXPORT_SYMBOL(inet_addr_type_table);
251
252 unsigned int inet_addr_type(struct net *net, __be32 addr)
253 {
254 return __inet_dev_addr_type(net, NULL, addr, RT_TABLE_LOCAL);
255 }
256 EXPORT_SYMBOL(inet_addr_type);
257
258 unsigned int inet_dev_addr_type(struct net *net, const struct net_device *dev,
259 __be32 addr)
260 {
261 u32 rt_table = l3mdev_fib_table(dev) ? : RT_TABLE_LOCAL;
262
263 return __inet_dev_addr_type(net, dev, addr, rt_table);
264 }
265 EXPORT_SYMBOL(inet_dev_addr_type);
266
267 /* inet_addr_type with dev == NULL but using the table from a dev
268 * if one is associated
269 */
270 unsigned int inet_addr_type_dev_table(struct net *net,
271 const struct net_device *dev,
272 __be32 addr)
273 {
274 u32 rt_table = l3mdev_fib_table(dev) ? : RT_TABLE_LOCAL;
275
276 return __inet_dev_addr_type(net, NULL, addr, rt_table);
277 }
278 EXPORT_SYMBOL(inet_addr_type_dev_table);
279
280 __be32 fib_compute_spec_dst(struct sk_buff *skb)
281 {
282 struct net_device *dev = skb->dev;
283 struct in_device *in_dev;
284 struct fib_result res;
285 struct rtable *rt;
286 struct net *net;
287 int scope;
288
289 rt = skb_rtable(skb);
290 if ((rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST | RTCF_LOCAL)) ==
291 RTCF_LOCAL)
292 return ip_hdr(skb)->daddr;
293
294 in_dev = __in_dev_get_rcu(dev);
295 BUG_ON(!in_dev);
296
297 net = dev_net(dev);
298
299 scope = RT_SCOPE_UNIVERSE;
300 if (!ipv4_is_zeronet(ip_hdr(skb)->saddr)) {
301 struct flowi4 fl4 = {
302 .flowi4_iif = LOOPBACK_IFINDEX,
303 .daddr = ip_hdr(skb)->saddr,
304 .flowi4_tos = RT_TOS(ip_hdr(skb)->tos),
305 .flowi4_scope = scope,
306 .flowi4_mark = IN_DEV_SRC_VMARK(in_dev) ? skb->mark : 0,
307 };
308 if (!fib_lookup(net, &fl4, &res, 0))
309 return FIB_RES_PREFSRC(net, res);
310 } else {
311 scope = RT_SCOPE_LINK;
312 }
313
314 return inet_select_addr(dev, ip_hdr(skb)->saddr, scope);
315 }
316
317 /* Given (packet source, input interface) and optional (dst, oif, tos):
318 * - (main) check, that source is valid i.e. not broadcast or our local
319 * address.
320 * - figure out what "logical" interface this packet arrived
321 * and calculate "specific destination" address.
322 * - check, that packet arrived from expected physical interface.
323 * called with rcu_read_lock()
324 */
325 static int __fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst,
326 u8 tos, int oif, struct net_device *dev,
327 int rpf, struct in_device *idev, u32 *itag)
328 {
329 int ret, no_addr;
330 struct fib_result res;
331 struct flowi4 fl4;
332 struct net *net = dev_net(dev);
333 bool dev_match;
334
335 fl4.flowi4_oif = 0;
336 fl4.flowi4_iif = l3mdev_master_ifindex_rcu(dev);
337 if (!fl4.flowi4_iif)
338 fl4.flowi4_iif = oif ? : LOOPBACK_IFINDEX;
339 fl4.daddr = src;
340 fl4.saddr = dst;
341 fl4.flowi4_tos = tos;
342 fl4.flowi4_scope = RT_SCOPE_UNIVERSE;
343 fl4.flowi4_tun_key.tun_id = 0;
344 fl4.flowi4_flags = 0;
345 fl4.flowi4_uid = sock_net_uid(net, NULL);
346
347 no_addr = idev->ifa_list == NULL;
348
349 fl4.flowi4_mark = IN_DEV_SRC_VMARK(idev) ? skb->mark : 0;
350
351 trace_fib_validate_source(dev, &fl4);
352
353 if (fib_lookup(net, &fl4, &res, 0))
354 goto last_resort;
355 if (res.type != RTN_UNICAST &&
356 (res.type != RTN_LOCAL || !IN_DEV_ACCEPT_LOCAL(idev)))
357 goto e_inval;
358 fib_combine_itag(itag, &res);
359 dev_match = false;
360
361 #ifdef CONFIG_IP_ROUTE_MULTIPATH
362 for (ret = 0; ret < res.fi->fib_nhs; ret++) {
363 struct fib_nh *nh = &res.fi->fib_nh[ret];
364
365 if (nh->nh_dev == dev) {
366 dev_match = true;
367 break;
368 } else if (l3mdev_master_ifindex_rcu(nh->nh_dev) == dev->ifindex) {
369 dev_match = true;
370 break;
371 }
372 }
373 #else
374 if (FIB_RES_DEV(res) == dev)
375 dev_match = true;
376 #endif
377 if (dev_match) {
378 ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST;
379 return ret;
380 }
381 if (no_addr)
382 goto last_resort;
383 if (rpf == 1)
384 goto e_rpf;
385 fl4.flowi4_oif = dev->ifindex;
386
387 ret = 0;
388 if (fib_lookup(net, &fl4, &res, FIB_LOOKUP_IGNORE_LINKSTATE) == 0) {
389 if (res.type == RTN_UNICAST)
390 ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST;
391 }
392 return ret;
393
394 last_resort:
395 if (rpf)
396 goto e_rpf;
397 *itag = 0;
398 return 0;
399
400 e_inval:
401 return -EINVAL;
402 e_rpf:
403 return -EXDEV;
404 }
405
406 /* Ignore rp_filter for packets protected by IPsec. */
407 int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst,
408 u8 tos, int oif, struct net_device *dev,
409 struct in_device *idev, u32 *itag)
410 {
411 int r = secpath_exists(skb) ? 0 : IN_DEV_RPFILTER(idev);
412 struct net *net = dev_net(dev);
413
414 if (!r && !fib_num_tclassid_users(net) &&
415 (dev->ifindex != oif || !IN_DEV_TX_REDIRECTS(idev))) {
416 if (IN_DEV_ACCEPT_LOCAL(idev))
417 goto ok;
418 /* with custom local routes in place, checking local addresses
419 * only will be too optimistic, with custom rules, checking
420 * local addresses only can be too strict, e.g. due to vrf
421 */
422 if (net->ipv4.fib_has_custom_local_routes ||
423 fib4_has_custom_rules(net))
424 goto full_check;
425 if (inet_lookup_ifaddr_rcu(net, src))
426 return -EINVAL;
427
428 ok:
429 *itag = 0;
430 return 0;
431 }
432
433 full_check:
434 return __fib_validate_source(skb, src, dst, tos, oif, dev, r, idev, itag);
435 }
436
437 static inline __be32 sk_extract_addr(struct sockaddr *addr)
438 {
439 return ((struct sockaddr_in *) addr)->sin_addr.s_addr;
440 }
441
442 static int put_rtax(struct nlattr *mx, int len, int type, u32 value)
443 {
444 struct nlattr *nla;
445
446 nla = (struct nlattr *) ((char *) mx + len);
447 nla->nla_type = type;
448 nla->nla_len = nla_attr_size(4);
449 *(u32 *) nla_data(nla) = value;
450
451 return len + nla_total_size(4);
452 }
453
454 static int rtentry_to_fib_config(struct net *net, int cmd, struct rtentry *rt,
455 struct fib_config *cfg)
456 {
457 __be32 addr;
458 int plen;
459
460 memset(cfg, 0, sizeof(*cfg));
461 cfg->fc_nlinfo.nl_net = net;
462
463 if (rt->rt_dst.sa_family != AF_INET)
464 return -EAFNOSUPPORT;
465
466 /*
467 * Check mask for validity:
468 * a) it must be contiguous.
469 * b) destination must have all host bits clear.
470 * c) if application forgot to set correct family (AF_INET),
471 * reject request unless it is absolutely clear i.e.
472 * both family and mask are zero.
473 */
474 plen = 32;
475 addr = sk_extract_addr(&rt->rt_dst);
476 if (!(rt->rt_flags & RTF_HOST)) {
477 __be32 mask = sk_extract_addr(&rt->rt_genmask);
478
479 if (rt->rt_genmask.sa_family != AF_INET) {
480 if (mask || rt->rt_genmask.sa_family)
481 return -EAFNOSUPPORT;
482 }
483
484 if (bad_mask(mask, addr))
485 return -EINVAL;
486
487 plen = inet_mask_len(mask);
488 }
489
490 cfg->fc_dst_len = plen;
491 cfg->fc_dst = addr;
492
493 if (cmd != SIOCDELRT) {
494 cfg->fc_nlflags = NLM_F_CREATE;
495 cfg->fc_protocol = RTPROT_BOOT;
496 }
497
498 if (rt->rt_metric)
499 cfg->fc_priority = rt->rt_metric - 1;
500
501 if (rt->rt_flags & RTF_REJECT) {
502 cfg->fc_scope = RT_SCOPE_HOST;
503 cfg->fc_type = RTN_UNREACHABLE;
504 return 0;
505 }
506
507 cfg->fc_scope = RT_SCOPE_NOWHERE;
508 cfg->fc_type = RTN_UNICAST;
509
510 if (rt->rt_dev) {
511 char *colon;
512 struct net_device *dev;
513 char devname[IFNAMSIZ];
514
515 if (copy_from_user(devname, rt->rt_dev, IFNAMSIZ-1))
516 return -EFAULT;
517
518 devname[IFNAMSIZ-1] = 0;
519 colon = strchr(devname, ':');
520 if (colon)
521 *colon = 0;
522 dev = __dev_get_by_name(net, devname);
523 if (!dev)
524 return -ENODEV;
525 cfg->fc_oif = dev->ifindex;
526 cfg->fc_table = l3mdev_fib_table(dev);
527 if (colon) {
528 struct in_ifaddr *ifa;
529 struct in_device *in_dev = __in_dev_get_rtnl(dev);
530 if (!in_dev)
531 return -ENODEV;
532 *colon = ':';
533 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next)
534 if (strcmp(ifa->ifa_label, devname) == 0)
535 break;
536 if (!ifa)
537 return -ENODEV;
538 cfg->fc_prefsrc = ifa->ifa_local;
539 }
540 }
541
542 addr = sk_extract_addr(&rt->rt_gateway);
543 if (rt->rt_gateway.sa_family == AF_INET && addr) {
544 unsigned int addr_type;
545
546 cfg->fc_gw = addr;
547 addr_type = inet_addr_type_table(net, addr, cfg->fc_table);
548 if (rt->rt_flags & RTF_GATEWAY &&
549 addr_type == RTN_UNICAST)
550 cfg->fc_scope = RT_SCOPE_UNIVERSE;
551 }
552
553 if (cmd == SIOCDELRT)
554 return 0;
555
556 if (rt->rt_flags & RTF_GATEWAY && !cfg->fc_gw)
557 return -EINVAL;
558
559 if (cfg->fc_scope == RT_SCOPE_NOWHERE)
560 cfg->fc_scope = RT_SCOPE_LINK;
561
562 if (rt->rt_flags & (RTF_MTU | RTF_WINDOW | RTF_IRTT)) {
563 struct nlattr *mx;
564 int len = 0;
565
566 mx = kzalloc(3 * nla_total_size(4), GFP_KERNEL);
567 if (!mx)
568 return -ENOMEM;
569
570 if (rt->rt_flags & RTF_MTU)
571 len = put_rtax(mx, len, RTAX_ADVMSS, rt->rt_mtu - 40);
572
573 if (rt->rt_flags & RTF_WINDOW)
574 len = put_rtax(mx, len, RTAX_WINDOW, rt->rt_window);
575
576 if (rt->rt_flags & RTF_IRTT)
577 len = put_rtax(mx, len, RTAX_RTT, rt->rt_irtt << 3);
578
579 cfg->fc_mx = mx;
580 cfg->fc_mx_len = len;
581 }
582
583 return 0;
584 }
585
586 /*
587 * Handle IP routing ioctl calls.
588 * These are used to manipulate the routing tables
589 */
590 int ip_rt_ioctl(struct net *net, unsigned int cmd, void __user *arg)
591 {
592 struct fib_config cfg;
593 struct rtentry rt;
594 int err;
595
596 switch (cmd) {
597 case SIOCADDRT: /* Add a route */
598 case SIOCDELRT: /* Delete a route */
599 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
600 return -EPERM;
601
602 if (copy_from_user(&rt, arg, sizeof(rt)))
603 return -EFAULT;
604
605 rtnl_lock();
606 err = rtentry_to_fib_config(net, cmd, &rt, &cfg);
607 if (err == 0) {
608 struct fib_table *tb;
609
610 if (cmd == SIOCDELRT) {
611 tb = fib_get_table(net, cfg.fc_table);
612 if (tb)
613 err = fib_table_delete(net, tb, &cfg,
614 NULL);
615 else
616 err = -ESRCH;
617 } else {
618 tb = fib_new_table(net, cfg.fc_table);
619 if (tb)
620 err = fib_table_insert(net, tb,
621 &cfg, NULL);
622 else
623 err = -ENOBUFS;
624 }
625
626 /* allocated by rtentry_to_fib_config() */
627 kfree(cfg.fc_mx);
628 }
629 rtnl_unlock();
630 return err;
631 }
632 return -EINVAL;
633 }
634
635 const struct nla_policy rtm_ipv4_policy[RTA_MAX + 1] = {
636 [RTA_DST] = { .type = NLA_U32 },
637 [RTA_SRC] = { .type = NLA_U32 },
638 [RTA_IIF] = { .type = NLA_U32 },
639 [RTA_OIF] = { .type = NLA_U32 },
640 [RTA_GATEWAY] = { .type = NLA_U32 },
641 [RTA_PRIORITY] = { .type = NLA_U32 },
642 [RTA_PREFSRC] = { .type = NLA_U32 },
643 [RTA_METRICS] = { .type = NLA_NESTED },
644 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
645 [RTA_FLOW] = { .type = NLA_U32 },
646 [RTA_ENCAP_TYPE] = { .type = NLA_U16 },
647 [RTA_ENCAP] = { .type = NLA_NESTED },
648 [RTA_UID] = { .type = NLA_U32 },
649 [RTA_MARK] = { .type = NLA_U32 },
650 };
651
652 static int rtm_to_fib_config(struct net *net, struct sk_buff *skb,
653 struct nlmsghdr *nlh, struct fib_config *cfg,
654 struct netlink_ext_ack *extack)
655 {
656 struct nlattr *attr;
657 int err, remaining;
658 struct rtmsg *rtm;
659
660 err = nlmsg_validate(nlh, sizeof(*rtm), RTA_MAX, rtm_ipv4_policy,
661 extack);
662 if (err < 0)
663 goto errout;
664
665 memset(cfg, 0, sizeof(*cfg));
666
667 rtm = nlmsg_data(nlh);
668 cfg->fc_dst_len = rtm->rtm_dst_len;
669 cfg->fc_tos = rtm->rtm_tos;
670 cfg->fc_table = rtm->rtm_table;
671 cfg->fc_protocol = rtm->rtm_protocol;
672 cfg->fc_scope = rtm->rtm_scope;
673 cfg->fc_type = rtm->rtm_type;
674 cfg->fc_flags = rtm->rtm_flags;
675 cfg->fc_nlflags = nlh->nlmsg_flags;
676
677 cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid;
678 cfg->fc_nlinfo.nlh = nlh;
679 cfg->fc_nlinfo.nl_net = net;
680
681 if (cfg->fc_type > RTN_MAX) {
682 NL_SET_ERR_MSG(extack, "Invalid route type");
683 err = -EINVAL;
684 goto errout;
685 }
686
687 nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), remaining) {
688 switch (nla_type(attr)) {
689 case RTA_DST:
690 cfg->fc_dst = nla_get_be32(attr);
691 break;
692 case RTA_OIF:
693 cfg->fc_oif = nla_get_u32(attr);
694 break;
695 case RTA_GATEWAY:
696 cfg->fc_gw = nla_get_be32(attr);
697 break;
698 case RTA_PRIORITY:
699 cfg->fc_priority = nla_get_u32(attr);
700 break;
701 case RTA_PREFSRC:
702 cfg->fc_prefsrc = nla_get_be32(attr);
703 break;
704 case RTA_METRICS:
705 cfg->fc_mx = nla_data(attr);
706 cfg->fc_mx_len = nla_len(attr);
707 break;
708 case RTA_MULTIPATH:
709 err = lwtunnel_valid_encap_type_attr(nla_data(attr),
710 nla_len(attr),
711 extack);
712 if (err < 0)
713 goto errout;
714 cfg->fc_mp = nla_data(attr);
715 cfg->fc_mp_len = nla_len(attr);
716 break;
717 case RTA_FLOW:
718 cfg->fc_flow = nla_get_u32(attr);
719 break;
720 case RTA_TABLE:
721 cfg->fc_table = nla_get_u32(attr);
722 break;
723 case RTA_ENCAP:
724 cfg->fc_encap = attr;
725 break;
726 case RTA_ENCAP_TYPE:
727 cfg->fc_encap_type = nla_get_u16(attr);
728 err = lwtunnel_valid_encap_type(cfg->fc_encap_type,
729 extack);
730 if (err < 0)
731 goto errout;
732 break;
733 }
734 }
735
736 return 0;
737 errout:
738 return err;
739 }
740
741 static int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh,
742 struct netlink_ext_ack *extack)
743 {
744 struct net *net = sock_net(skb->sk);
745 struct fib_config cfg;
746 struct fib_table *tb;
747 int err;
748
749 err = rtm_to_fib_config(net, skb, nlh, &cfg, extack);
750 if (err < 0)
751 goto errout;
752
753 tb = fib_get_table(net, cfg.fc_table);
754 if (!tb) {
755 NL_SET_ERR_MSG(extack, "FIB table does not exist");
756 err = -ESRCH;
757 goto errout;
758 }
759
760 err = fib_table_delete(net, tb, &cfg, extack);
761 errout:
762 return err;
763 }
764
765 static int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh,
766 struct netlink_ext_ack *extack)
767 {
768 struct net *net = sock_net(skb->sk);
769 struct fib_config cfg;
770 struct fib_table *tb;
771 int err;
772
773 err = rtm_to_fib_config(net, skb, nlh, &cfg, extack);
774 if (err < 0)
775 goto errout;
776
777 tb = fib_new_table(net, cfg.fc_table);
778 if (!tb) {
779 err = -ENOBUFS;
780 goto errout;
781 }
782
783 err = fib_table_insert(net, tb, &cfg, extack);
784 if (!err && cfg.fc_type == RTN_LOCAL)
785 net->ipv4.fib_has_custom_local_routes = true;
786 errout:
787 return err;
788 }
789
790 static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb)
791 {
792 struct net *net = sock_net(skb->sk);
793 unsigned int h, s_h;
794 unsigned int e = 0, s_e;
795 struct fib_table *tb;
796 struct hlist_head *head;
797 int dumped = 0, err;
798
799 if (nlmsg_len(cb->nlh) >= sizeof(struct rtmsg) &&
800 ((struct rtmsg *) nlmsg_data(cb->nlh))->rtm_flags & RTM_F_CLONED)
801 return skb->len;
802
803 s_h = cb->args[0];
804 s_e = cb->args[1];
805
806 rcu_read_lock();
807
808 for (h = s_h; h < FIB_TABLE_HASHSZ; h++, s_e = 0) {
809 e = 0;
810 head = &net->ipv4.fib_table_hash[h];
811 hlist_for_each_entry_rcu(tb, head, tb_hlist) {
812 if (e < s_e)
813 goto next;
814 if (dumped)
815 memset(&cb->args[2], 0, sizeof(cb->args) -
816 2 * sizeof(cb->args[0]));
817 err = fib_table_dump(tb, skb, cb);
818 if (err < 0) {
819 if (likely(skb->len))
820 goto out;
821
822 goto out_err;
823 }
824 dumped = 1;
825 next:
826 e++;
827 }
828 }
829 out:
830 err = skb->len;
831 out_err:
832 rcu_read_unlock();
833
834 cb->args[1] = e;
835 cb->args[0] = h;
836
837 return err;
838 }
839
840 /* Prepare and feed intra-kernel routing request.
841 * Really, it should be netlink message, but :-( netlink
842 * can be not configured, so that we feed it directly
843 * to fib engine. It is legal, because all events occur
844 * only when netlink is already locked.
845 */
846 static void fib_magic(int cmd, int type, __be32 dst, int dst_len, struct in_ifaddr *ifa)
847 {
848 struct net *net = dev_net(ifa->ifa_dev->dev);
849 u32 tb_id = l3mdev_fib_table(ifa->ifa_dev->dev);
850 struct fib_table *tb;
851 struct fib_config cfg = {
852 .fc_protocol = RTPROT_KERNEL,
853 .fc_type = type,
854 .fc_dst = dst,
855 .fc_dst_len = dst_len,
856 .fc_prefsrc = ifa->ifa_local,
857 .fc_oif = ifa->ifa_dev->dev->ifindex,
858 .fc_nlflags = NLM_F_CREATE | NLM_F_APPEND,
859 .fc_nlinfo = {
860 .nl_net = net,
861 },
862 };
863
864 if (!tb_id)
865 tb_id = (type == RTN_UNICAST) ? RT_TABLE_MAIN : RT_TABLE_LOCAL;
866
867 tb = fib_new_table(net, tb_id);
868 if (!tb)
869 return;
870
871 cfg.fc_table = tb->tb_id;
872
873 if (type != RTN_LOCAL)
874 cfg.fc_scope = RT_SCOPE_LINK;
875 else
876 cfg.fc_scope = RT_SCOPE_HOST;
877
878 if (cmd == RTM_NEWROUTE)
879 fib_table_insert(net, tb, &cfg, NULL);
880 else
881 fib_table_delete(net, tb, &cfg, NULL);
882 }
883
884 void fib_add_ifaddr(struct in_ifaddr *ifa)
885 {
886 struct in_device *in_dev = ifa->ifa_dev;
887 struct net_device *dev = in_dev->dev;
888 struct in_ifaddr *prim = ifa;
889 __be32 mask = ifa->ifa_mask;
890 __be32 addr = ifa->ifa_local;
891 __be32 prefix = ifa->ifa_address & mask;
892
893 if (ifa->ifa_flags & IFA_F_SECONDARY) {
894 prim = inet_ifa_byprefix(in_dev, prefix, mask);
895 if (!prim) {
896 pr_warn("%s: bug: prim == NULL\n", __func__);
897 return;
898 }
899 }
900
901 fib_magic(RTM_NEWROUTE, RTN_LOCAL, addr, 32, prim);
902
903 if (!(dev->flags & IFF_UP))
904 return;
905
906 /* Add broadcast address, if it is explicitly assigned. */
907 if (ifa->ifa_broadcast && ifa->ifa_broadcast != htonl(0xFFFFFFFF))
908 fib_magic(RTM_NEWROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim);
909
910 if (!ipv4_is_zeronet(prefix) && !(ifa->ifa_flags & IFA_F_SECONDARY) &&
911 (prefix != addr || ifa->ifa_prefixlen < 32)) {
912 if (!(ifa->ifa_flags & IFA_F_NOPREFIXROUTE))
913 fib_magic(RTM_NEWROUTE,
914 dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST,
915 prefix, ifa->ifa_prefixlen, prim);
916
917 /* Add network specific broadcasts, when it takes a sense */
918 if (ifa->ifa_prefixlen < 31) {
919 fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix, 32, prim);
920 fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix | ~mask,
921 32, prim);
922 }
923 }
924 }
925
926 /* Delete primary or secondary address.
927 * Optionally, on secondary address promotion consider the addresses
928 * from subnet iprim as deleted, even if they are in device list.
929 * In this case the secondary ifa can be in device list.
930 */
931 void fib_del_ifaddr(struct in_ifaddr *ifa, struct in_ifaddr *iprim)
932 {
933 struct in_device *in_dev = ifa->ifa_dev;
934 struct net_device *dev = in_dev->dev;
935 struct in_ifaddr *ifa1;
936 struct in_ifaddr *prim = ifa, *prim1 = NULL;
937 __be32 brd = ifa->ifa_address | ~ifa->ifa_mask;
938 __be32 any = ifa->ifa_address & ifa->ifa_mask;
939 #define LOCAL_OK 1
940 #define BRD_OK 2
941 #define BRD0_OK 4
942 #define BRD1_OK 8
943 unsigned int ok = 0;
944 int subnet = 0; /* Primary network */
945 int gone = 1; /* Address is missing */
946 int same_prefsrc = 0; /* Another primary with same IP */
947
948 if (ifa->ifa_flags & IFA_F_SECONDARY) {
949 prim = inet_ifa_byprefix(in_dev, any, ifa->ifa_mask);
950 if (!prim) {
951 /* if the device has been deleted, we don't perform
952 * address promotion
953 */
954 if (!in_dev->dead)
955 pr_warn("%s: bug: prim == NULL\n", __func__);
956 return;
957 }
958 if (iprim && iprim != prim) {
959 pr_warn("%s: bug: iprim != prim\n", __func__);
960 return;
961 }
962 } else if (!ipv4_is_zeronet(any) &&
963 (any != ifa->ifa_local || ifa->ifa_prefixlen < 32)) {
964 if (!(ifa->ifa_flags & IFA_F_NOPREFIXROUTE))
965 fib_magic(RTM_DELROUTE,
966 dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST,
967 any, ifa->ifa_prefixlen, prim);
968 subnet = 1;
969 }
970
971 if (in_dev->dead)
972 goto no_promotions;
973
974 /* Deletion is more complicated than add.
975 * We should take care of not to delete too much :-)
976 *
977 * Scan address list to be sure that addresses are really gone.
978 */
979
980 for (ifa1 = in_dev->ifa_list; ifa1; ifa1 = ifa1->ifa_next) {
981 if (ifa1 == ifa) {
982 /* promotion, keep the IP */
983 gone = 0;
984 continue;
985 }
986 /* Ignore IFAs from our subnet */
987 if (iprim && ifa1->ifa_mask == iprim->ifa_mask &&
988 inet_ifa_match(ifa1->ifa_address, iprim))
989 continue;
990
991 /* Ignore ifa1 if it uses different primary IP (prefsrc) */
992 if (ifa1->ifa_flags & IFA_F_SECONDARY) {
993 /* Another address from our subnet? */
994 if (ifa1->ifa_mask == prim->ifa_mask &&
995 inet_ifa_match(ifa1->ifa_address, prim))
996 prim1 = prim;
997 else {
998 /* We reached the secondaries, so
999 * same_prefsrc should be determined.
1000 */
1001 if (!same_prefsrc)
1002 continue;
1003 /* Search new prim1 if ifa1 is not
1004 * using the current prim1
1005 */
1006 if (!prim1 ||
1007 ifa1->ifa_mask != prim1->ifa_mask ||
1008 !inet_ifa_match(ifa1->ifa_address, prim1))
1009 prim1 = inet_ifa_byprefix(in_dev,
1010 ifa1->ifa_address,
1011 ifa1->ifa_mask);
1012 if (!prim1)
1013 continue;
1014 if (prim1->ifa_local != prim->ifa_local)
1015 continue;
1016 }
1017 } else {
1018 if (prim->ifa_local != ifa1->ifa_local)
1019 continue;
1020 prim1 = ifa1;
1021 if (prim != prim1)
1022 same_prefsrc = 1;
1023 }
1024 if (ifa->ifa_local == ifa1->ifa_local)
1025 ok |= LOCAL_OK;
1026 if (ifa->ifa_broadcast == ifa1->ifa_broadcast)
1027 ok |= BRD_OK;
1028 if (brd == ifa1->ifa_broadcast)
1029 ok |= BRD1_OK;
1030 if (any == ifa1->ifa_broadcast)
1031 ok |= BRD0_OK;
1032 /* primary has network specific broadcasts */
1033 if (prim1 == ifa1 && ifa1->ifa_prefixlen < 31) {
1034 __be32 brd1 = ifa1->ifa_address | ~ifa1->ifa_mask;
1035 __be32 any1 = ifa1->ifa_address & ifa1->ifa_mask;
1036
1037 if (!ipv4_is_zeronet(any1)) {
1038 if (ifa->ifa_broadcast == brd1 ||
1039 ifa->ifa_broadcast == any1)
1040 ok |= BRD_OK;
1041 if (brd == brd1 || brd == any1)
1042 ok |= BRD1_OK;
1043 if (any == brd1 || any == any1)
1044 ok |= BRD0_OK;
1045 }
1046 }
1047 }
1048
1049 no_promotions:
1050 if (!(ok & BRD_OK))
1051 fib_magic(RTM_DELROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim);
1052 if (subnet && ifa->ifa_prefixlen < 31) {
1053 if (!(ok & BRD1_OK))
1054 fib_magic(RTM_DELROUTE, RTN_BROADCAST, brd, 32, prim);
1055 if (!(ok & BRD0_OK))
1056 fib_magic(RTM_DELROUTE, RTN_BROADCAST, any, 32, prim);
1057 }
1058 if (!(ok & LOCAL_OK)) {
1059 unsigned int addr_type;
1060
1061 fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 32, prim);
1062
1063 /* Check, that this local address finally disappeared. */
1064 addr_type = inet_addr_type_dev_table(dev_net(dev), dev,
1065 ifa->ifa_local);
1066 if (gone && addr_type != RTN_LOCAL) {
1067 /* And the last, but not the least thing.
1068 * We must flush stray FIB entries.
1069 *
1070 * First of all, we scan fib_info list searching
1071 * for stray nexthop entries, then ignite fib_flush.
1072 */
1073 if (fib_sync_down_addr(dev, ifa->ifa_local))
1074 fib_flush(dev_net(dev));
1075 }
1076 }
1077 #undef LOCAL_OK
1078 #undef BRD_OK
1079 #undef BRD0_OK
1080 #undef BRD1_OK
1081 }
1082
1083 static void nl_fib_lookup(struct net *net, struct fib_result_nl *frn)
1084 {
1085
1086 struct fib_result res;
1087 struct flowi4 fl4 = {
1088 .flowi4_mark = frn->fl_mark,
1089 .daddr = frn->fl_addr,
1090 .flowi4_tos = frn->fl_tos,
1091 .flowi4_scope = frn->fl_scope,
1092 };
1093 struct fib_table *tb;
1094
1095 rcu_read_lock();
1096
1097 tb = fib_get_table(net, frn->tb_id_in);
1098
1099 frn->err = -ENOENT;
1100 if (tb) {
1101 local_bh_disable();
1102
1103 frn->tb_id = tb->tb_id;
1104 frn->err = fib_table_lookup(tb, &fl4, &res, FIB_LOOKUP_NOREF);
1105
1106 if (!frn->err) {
1107 frn->prefixlen = res.prefixlen;
1108 frn->nh_sel = res.nh_sel;
1109 frn->type = res.type;
1110 frn->scope = res.scope;
1111 }
1112 local_bh_enable();
1113 }
1114
1115 rcu_read_unlock();
1116 }
1117
1118 static void nl_fib_input(struct sk_buff *skb)
1119 {
1120 struct net *net;
1121 struct fib_result_nl *frn;
1122 struct nlmsghdr *nlh;
1123 u32 portid;
1124
1125 net = sock_net(skb->sk);
1126 nlh = nlmsg_hdr(skb);
1127 if (skb->len < nlmsg_total_size(sizeof(*frn)) ||
1128 skb->len < nlh->nlmsg_len ||
1129 nlmsg_len(nlh) < sizeof(*frn))
1130 return;
1131
1132 skb = netlink_skb_clone(skb, GFP_KERNEL);
1133 if (!skb)
1134 return;
1135 nlh = nlmsg_hdr(skb);
1136
1137 frn = (struct fib_result_nl *) nlmsg_data(nlh);
1138 nl_fib_lookup(net, frn);
1139
1140 portid = NETLINK_CB(skb).portid; /* netlink portid */
1141 NETLINK_CB(skb).portid = 0; /* from kernel */
1142 NETLINK_CB(skb).dst_group = 0; /* unicast */
1143 netlink_unicast(net->ipv4.fibnl, skb, portid, MSG_DONTWAIT);
1144 }
1145
1146 static int __net_init nl_fib_lookup_init(struct net *net)
1147 {
1148 struct sock *sk;
1149 struct netlink_kernel_cfg cfg = {
1150 .input = nl_fib_input,
1151 };
1152
1153 sk = netlink_kernel_create(net, NETLINK_FIB_LOOKUP, &cfg);
1154 if (!sk)
1155 return -EAFNOSUPPORT;
1156 net->ipv4.fibnl = sk;
1157 return 0;
1158 }
1159
1160 static void nl_fib_lookup_exit(struct net *net)
1161 {
1162 netlink_kernel_release(net->ipv4.fibnl);
1163 net->ipv4.fibnl = NULL;
1164 }
1165
1166 static void fib_disable_ip(struct net_device *dev, unsigned long event,
1167 bool force)
1168 {
1169 if (fib_sync_down_dev(dev, event, force))
1170 fib_flush(dev_net(dev));
1171 else
1172 rt_cache_flush(dev_net(dev));
1173 arp_ifdown(dev);
1174 }
1175
1176 static int fib_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
1177 {
1178 struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
1179 struct net_device *dev = ifa->ifa_dev->dev;
1180 struct net *net = dev_net(dev);
1181
1182 switch (event) {
1183 case NETDEV_UP:
1184 fib_add_ifaddr(ifa);
1185 #ifdef CONFIG_IP_ROUTE_MULTIPATH
1186 fib_sync_up(dev, RTNH_F_DEAD);
1187 #endif
1188 atomic_inc(&net->ipv4.dev_addr_genid);
1189 rt_cache_flush(dev_net(dev));
1190 break;
1191 case NETDEV_DOWN:
1192 fib_del_ifaddr(ifa, NULL);
1193 atomic_inc(&net->ipv4.dev_addr_genid);
1194 if (!ifa->ifa_dev->ifa_list) {
1195 /* Last address was deleted from this interface.
1196 * Disable IP.
1197 */
1198 fib_disable_ip(dev, event, true);
1199 } else {
1200 rt_cache_flush(dev_net(dev));
1201 }
1202 break;
1203 }
1204 return NOTIFY_DONE;
1205 }
1206
1207 static int fib_netdev_event(struct notifier_block *this, unsigned long event, void *ptr)
1208 {
1209 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1210 struct netdev_notifier_changeupper_info *info;
1211 struct in_device *in_dev;
1212 struct net *net = dev_net(dev);
1213 unsigned int flags;
1214
1215 if (event == NETDEV_UNREGISTER) {
1216 fib_disable_ip(dev, event, true);
1217 rt_flush_dev(dev);
1218 return NOTIFY_DONE;
1219 }
1220
1221 in_dev = __in_dev_get_rtnl(dev);
1222 if (!in_dev)
1223 return NOTIFY_DONE;
1224
1225 switch (event) {
1226 case NETDEV_UP:
1227 for_ifa(in_dev) {
1228 fib_add_ifaddr(ifa);
1229 } endfor_ifa(in_dev);
1230 #ifdef CONFIG_IP_ROUTE_MULTIPATH
1231 fib_sync_up(dev, RTNH_F_DEAD);
1232 #endif
1233 atomic_inc(&net->ipv4.dev_addr_genid);
1234 rt_cache_flush(net);
1235 break;
1236 case NETDEV_DOWN:
1237 fib_disable_ip(dev, event, false);
1238 break;
1239 case NETDEV_CHANGE:
1240 flags = dev_get_flags(dev);
1241 if (flags & (IFF_RUNNING | IFF_LOWER_UP))
1242 fib_sync_up(dev, RTNH_F_LINKDOWN);
1243 else
1244 fib_sync_down_dev(dev, event, false);
1245 /* fall through */
1246 case NETDEV_CHANGEMTU:
1247 rt_cache_flush(net);
1248 break;
1249 case NETDEV_CHANGEUPPER:
1250 info = ptr;
1251 /* flush all routes if dev is linked to or unlinked from
1252 * an L3 master device (e.g., VRF)
1253 */
1254 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
1255 fib_disable_ip(dev, NETDEV_DOWN, true);
1256 break;
1257 }
1258 return NOTIFY_DONE;
1259 }
1260
1261 static struct notifier_block fib_inetaddr_notifier = {
1262 .notifier_call = fib_inetaddr_event,
1263 };
1264
1265 static struct notifier_block fib_netdev_notifier = {
1266 .notifier_call = fib_netdev_event,
1267 };
1268
1269 static int __net_init ip_fib_net_init(struct net *net)
1270 {
1271 int err;
1272 size_t size = sizeof(struct hlist_head) * FIB_TABLE_HASHSZ;
1273
1274 err = fib4_notifier_init(net);
1275 if (err)
1276 return err;
1277
1278 /* Avoid false sharing : Use at least a full cache line */
1279 size = max_t(size_t, size, L1_CACHE_BYTES);
1280
1281 net->ipv4.fib_table_hash = kzalloc(size, GFP_KERNEL);
1282 if (!net->ipv4.fib_table_hash) {
1283 err = -ENOMEM;
1284 goto err_table_hash_alloc;
1285 }
1286
1287 err = fib4_rules_init(net);
1288 if (err < 0)
1289 goto err_rules_init;
1290 return 0;
1291
1292 err_rules_init:
1293 kfree(net->ipv4.fib_table_hash);
1294 err_table_hash_alloc:
1295 fib4_notifier_exit(net);
1296 return err;
1297 }
1298
1299 static void ip_fib_net_exit(struct net *net)
1300 {
1301 int i;
1302
1303 rtnl_lock();
1304 #ifdef CONFIG_IP_MULTIPLE_TABLES
1305 RCU_INIT_POINTER(net->ipv4.fib_main, NULL);
1306 RCU_INIT_POINTER(net->ipv4.fib_default, NULL);
1307 #endif
1308 /* Destroy the tables in reverse order to guarantee that the
1309 * local table, ID 255, is destroyed before the main table, ID
1310 * 254. This is necessary as the local table may contain
1311 * references to data contained in the main table.
1312 */
1313 for (i = FIB_TABLE_HASHSZ - 1; i >= 0; i--) {
1314 struct hlist_head *head = &net->ipv4.fib_table_hash[i];
1315 struct hlist_node *tmp;
1316 struct fib_table *tb;
1317
1318 hlist_for_each_entry_safe(tb, tmp, head, tb_hlist) {
1319 hlist_del(&tb->tb_hlist);
1320 fib_table_flush(net, tb);
1321 fib_free_table(tb);
1322 }
1323 }
1324
1325 #ifdef CONFIG_IP_MULTIPLE_TABLES
1326 fib4_rules_exit(net);
1327 #endif
1328 rtnl_unlock();
1329 kfree(net->ipv4.fib_table_hash);
1330 fib4_notifier_exit(net);
1331 }
1332
1333 static int __net_init fib_net_init(struct net *net)
1334 {
1335 int error;
1336
1337 #ifdef CONFIG_IP_ROUTE_CLASSID
1338 net->ipv4.fib_num_tclassid_users = 0;
1339 #endif
1340 error = ip_fib_net_init(net);
1341 if (error < 0)
1342 goto out;
1343 error = nl_fib_lookup_init(net);
1344 if (error < 0)
1345 goto out_nlfl;
1346 error = fib_proc_init(net);
1347 if (error < 0)
1348 goto out_proc;
1349 out:
1350 return error;
1351
1352 out_proc:
1353 nl_fib_lookup_exit(net);
1354 out_nlfl:
1355 ip_fib_net_exit(net);
1356 goto out;
1357 }
1358
1359 static void __net_exit fib_net_exit(struct net *net)
1360 {
1361 fib_proc_exit(net);
1362 nl_fib_lookup_exit(net);
1363 ip_fib_net_exit(net);
1364 }
1365
1366 static struct pernet_operations fib_net_ops = {
1367 .init = fib_net_init,
1368 .exit = fib_net_exit,
1369 };
1370
1371 void __init ip_fib_init(void)
1372 {
1373 fib_trie_init();
1374
1375 register_pernet_subsys(&fib_net_ops);
1376
1377 register_netdevice_notifier(&fib_netdev_notifier);
1378 register_inetaddr_notifier(&fib_inetaddr_notifier);
1379
1380 rtnl_register(PF_INET, RTM_NEWROUTE, inet_rtm_newroute, NULL, 0);
1381 rtnl_register(PF_INET, RTM_DELROUTE, inet_rtm_delroute, NULL, 0);
1382 rtnl_register(PF_INET, RTM_GETROUTE, NULL, inet_dump_fib, 0);
1383 }
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