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ipv4: Return EINVAL when ping_group_range sysctl doesn't map to user ns
[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 [RTA_TABLE] = { .type = NLA_U32 },
651 };
652
653 static int rtm_to_fib_config(struct net *net, struct sk_buff *skb,
654 struct nlmsghdr *nlh, struct fib_config *cfg,
655 struct netlink_ext_ack *extack)
656 {
657 struct nlattr *attr;
658 int err, remaining;
659 struct rtmsg *rtm;
660
661 err = nlmsg_validate(nlh, sizeof(*rtm), RTA_MAX, rtm_ipv4_policy,
662 extack);
663 if (err < 0)
664 goto errout;
665
666 memset(cfg, 0, sizeof(*cfg));
667
668 rtm = nlmsg_data(nlh);
669 cfg->fc_dst_len = rtm->rtm_dst_len;
670 cfg->fc_tos = rtm->rtm_tos;
671 cfg->fc_table = rtm->rtm_table;
672 cfg->fc_protocol = rtm->rtm_protocol;
673 cfg->fc_scope = rtm->rtm_scope;
674 cfg->fc_type = rtm->rtm_type;
675 cfg->fc_flags = rtm->rtm_flags;
676 cfg->fc_nlflags = nlh->nlmsg_flags;
677
678 cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid;
679 cfg->fc_nlinfo.nlh = nlh;
680 cfg->fc_nlinfo.nl_net = net;
681
682 if (cfg->fc_type > RTN_MAX) {
683 NL_SET_ERR_MSG(extack, "Invalid route type");
684 err = -EINVAL;
685 goto errout;
686 }
687
688 nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), remaining) {
689 switch (nla_type(attr)) {
690 case RTA_DST:
691 cfg->fc_dst = nla_get_be32(attr);
692 break;
693 case RTA_OIF:
694 cfg->fc_oif = nla_get_u32(attr);
695 break;
696 case RTA_GATEWAY:
697 cfg->fc_gw = nla_get_be32(attr);
698 break;
699 case RTA_PRIORITY:
700 cfg->fc_priority = nla_get_u32(attr);
701 break;
702 case RTA_PREFSRC:
703 cfg->fc_prefsrc = nla_get_be32(attr);
704 break;
705 case RTA_METRICS:
706 cfg->fc_mx = nla_data(attr);
707 cfg->fc_mx_len = nla_len(attr);
708 break;
709 case RTA_MULTIPATH:
710 err = lwtunnel_valid_encap_type_attr(nla_data(attr),
711 nla_len(attr),
712 extack);
713 if (err < 0)
714 goto errout;
715 cfg->fc_mp = nla_data(attr);
716 cfg->fc_mp_len = nla_len(attr);
717 break;
718 case RTA_FLOW:
719 cfg->fc_flow = nla_get_u32(attr);
720 break;
721 case RTA_TABLE:
722 cfg->fc_table = nla_get_u32(attr);
723 break;
724 case RTA_ENCAP:
725 cfg->fc_encap = attr;
726 break;
727 case RTA_ENCAP_TYPE:
728 cfg->fc_encap_type = nla_get_u16(attr);
729 err = lwtunnel_valid_encap_type(cfg->fc_encap_type,
730 extack);
731 if (err < 0)
732 goto errout;
733 break;
734 }
735 }
736
737 return 0;
738 errout:
739 return err;
740 }
741
742 static int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh,
743 struct netlink_ext_ack *extack)
744 {
745 struct net *net = sock_net(skb->sk);
746 struct fib_config cfg;
747 struct fib_table *tb;
748 int err;
749
750 err = rtm_to_fib_config(net, skb, nlh, &cfg, extack);
751 if (err < 0)
752 goto errout;
753
754 tb = fib_get_table(net, cfg.fc_table);
755 if (!tb) {
756 NL_SET_ERR_MSG(extack, "FIB table does not exist");
757 err = -ESRCH;
758 goto errout;
759 }
760
761 err = fib_table_delete(net, tb, &cfg, extack);
762 errout:
763 return err;
764 }
765
766 static int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh,
767 struct netlink_ext_ack *extack)
768 {
769 struct net *net = sock_net(skb->sk);
770 struct fib_config cfg;
771 struct fib_table *tb;
772 int err;
773
774 err = rtm_to_fib_config(net, skb, nlh, &cfg, extack);
775 if (err < 0)
776 goto errout;
777
778 tb = fib_new_table(net, cfg.fc_table);
779 if (!tb) {
780 err = -ENOBUFS;
781 goto errout;
782 }
783
784 err = fib_table_insert(net, tb, &cfg, extack);
785 if (!err && cfg.fc_type == RTN_LOCAL)
786 net->ipv4.fib_has_custom_local_routes = true;
787 errout:
788 return err;
789 }
790
791 static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb)
792 {
793 struct net *net = sock_net(skb->sk);
794 unsigned int h, s_h;
795 unsigned int e = 0, s_e;
796 struct fib_table *tb;
797 struct hlist_head *head;
798 int dumped = 0, err;
799
800 if (nlmsg_len(cb->nlh) >= sizeof(struct rtmsg) &&
801 ((struct rtmsg *) nlmsg_data(cb->nlh))->rtm_flags & RTM_F_CLONED)
802 return skb->len;
803
804 s_h = cb->args[0];
805 s_e = cb->args[1];
806
807 rcu_read_lock();
808
809 for (h = s_h; h < FIB_TABLE_HASHSZ; h++, s_e = 0) {
810 e = 0;
811 head = &net->ipv4.fib_table_hash[h];
812 hlist_for_each_entry_rcu(tb, head, tb_hlist) {
813 if (e < s_e)
814 goto next;
815 if (dumped)
816 memset(&cb->args[2], 0, sizeof(cb->args) -
817 2 * sizeof(cb->args[0]));
818 err = fib_table_dump(tb, skb, cb);
819 if (err < 0) {
820 if (likely(skb->len))
821 goto out;
822
823 goto out_err;
824 }
825 dumped = 1;
826 next:
827 e++;
828 }
829 }
830 out:
831 err = skb->len;
832 out_err:
833 rcu_read_unlock();
834
835 cb->args[1] = e;
836 cb->args[0] = h;
837
838 return err;
839 }
840
841 /* Prepare and feed intra-kernel routing request.
842 * Really, it should be netlink message, but :-( netlink
843 * can be not configured, so that we feed it directly
844 * to fib engine. It is legal, because all events occur
845 * only when netlink is already locked.
846 */
847 static void fib_magic(int cmd, int type, __be32 dst, int dst_len, struct in_ifaddr *ifa)
848 {
849 struct net *net = dev_net(ifa->ifa_dev->dev);
850 u32 tb_id = l3mdev_fib_table(ifa->ifa_dev->dev);
851 struct fib_table *tb;
852 struct fib_config cfg = {
853 .fc_protocol = RTPROT_KERNEL,
854 .fc_type = type,
855 .fc_dst = dst,
856 .fc_dst_len = dst_len,
857 .fc_prefsrc = ifa->ifa_local,
858 .fc_oif = ifa->ifa_dev->dev->ifindex,
859 .fc_nlflags = NLM_F_CREATE | NLM_F_APPEND,
860 .fc_nlinfo = {
861 .nl_net = net,
862 },
863 };
864
865 if (!tb_id)
866 tb_id = (type == RTN_UNICAST) ? RT_TABLE_MAIN : RT_TABLE_LOCAL;
867
868 tb = fib_new_table(net, tb_id);
869 if (!tb)
870 return;
871
872 cfg.fc_table = tb->tb_id;
873
874 if (type != RTN_LOCAL)
875 cfg.fc_scope = RT_SCOPE_LINK;
876 else
877 cfg.fc_scope = RT_SCOPE_HOST;
878
879 if (cmd == RTM_NEWROUTE)
880 fib_table_insert(net, tb, &cfg, NULL);
881 else
882 fib_table_delete(net, tb, &cfg, NULL);
883 }
884
885 void fib_add_ifaddr(struct in_ifaddr *ifa)
886 {
887 struct in_device *in_dev = ifa->ifa_dev;
888 struct net_device *dev = in_dev->dev;
889 struct in_ifaddr *prim = ifa;
890 __be32 mask = ifa->ifa_mask;
891 __be32 addr = ifa->ifa_local;
892 __be32 prefix = ifa->ifa_address & mask;
893
894 if (ifa->ifa_flags & IFA_F_SECONDARY) {
895 prim = inet_ifa_byprefix(in_dev, prefix, mask);
896 if (!prim) {
897 pr_warn("%s: bug: prim == NULL\n", __func__);
898 return;
899 }
900 }
901
902 fib_magic(RTM_NEWROUTE, RTN_LOCAL, addr, 32, prim);
903
904 if (!(dev->flags & IFF_UP))
905 return;
906
907 /* Add broadcast address, if it is explicitly assigned. */
908 if (ifa->ifa_broadcast && ifa->ifa_broadcast != htonl(0xFFFFFFFF))
909 fib_magic(RTM_NEWROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim);
910
911 if (!ipv4_is_zeronet(prefix) && !(ifa->ifa_flags & IFA_F_SECONDARY) &&
912 (prefix != addr || ifa->ifa_prefixlen < 32)) {
913 if (!(ifa->ifa_flags & IFA_F_NOPREFIXROUTE))
914 fib_magic(RTM_NEWROUTE,
915 dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST,
916 prefix, ifa->ifa_prefixlen, prim);
917
918 /* Add network specific broadcasts, when it takes a sense */
919 if (ifa->ifa_prefixlen < 31) {
920 fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix, 32, prim);
921 fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix | ~mask,
922 32, prim);
923 }
924 }
925 }
926
927 /* Delete primary or secondary address.
928 * Optionally, on secondary address promotion consider the addresses
929 * from subnet iprim as deleted, even if they are in device list.
930 * In this case the secondary ifa can be in device list.
931 */
932 void fib_del_ifaddr(struct in_ifaddr *ifa, struct in_ifaddr *iprim)
933 {
934 struct in_device *in_dev = ifa->ifa_dev;
935 struct net_device *dev = in_dev->dev;
936 struct in_ifaddr *ifa1;
937 struct in_ifaddr *prim = ifa, *prim1 = NULL;
938 __be32 brd = ifa->ifa_address | ~ifa->ifa_mask;
939 __be32 any = ifa->ifa_address & ifa->ifa_mask;
940 #define LOCAL_OK 1
941 #define BRD_OK 2
942 #define BRD0_OK 4
943 #define BRD1_OK 8
944 unsigned int ok = 0;
945 int subnet = 0; /* Primary network */
946 int gone = 1; /* Address is missing */
947 int same_prefsrc = 0; /* Another primary with same IP */
948
949 if (ifa->ifa_flags & IFA_F_SECONDARY) {
950 prim = inet_ifa_byprefix(in_dev, any, ifa->ifa_mask);
951 if (!prim) {
952 /* if the device has been deleted, we don't perform
953 * address promotion
954 */
955 if (!in_dev->dead)
956 pr_warn("%s: bug: prim == NULL\n", __func__);
957 return;
958 }
959 if (iprim && iprim != prim) {
960 pr_warn("%s: bug: iprim != prim\n", __func__);
961 return;
962 }
963 } else if (!ipv4_is_zeronet(any) &&
964 (any != ifa->ifa_local || ifa->ifa_prefixlen < 32)) {
965 if (!(ifa->ifa_flags & IFA_F_NOPREFIXROUTE))
966 fib_magic(RTM_DELROUTE,
967 dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST,
968 any, ifa->ifa_prefixlen, prim);
969 subnet = 1;
970 }
971
972 if (in_dev->dead)
973 goto no_promotions;
974
975 /* Deletion is more complicated than add.
976 * We should take care of not to delete too much :-)
977 *
978 * Scan address list to be sure that addresses are really gone.
979 */
980
981 for (ifa1 = in_dev->ifa_list; ifa1; ifa1 = ifa1->ifa_next) {
982 if (ifa1 == ifa) {
983 /* promotion, keep the IP */
984 gone = 0;
985 continue;
986 }
987 /* Ignore IFAs from our subnet */
988 if (iprim && ifa1->ifa_mask == iprim->ifa_mask &&
989 inet_ifa_match(ifa1->ifa_address, iprim))
990 continue;
991
992 /* Ignore ifa1 if it uses different primary IP (prefsrc) */
993 if (ifa1->ifa_flags & IFA_F_SECONDARY) {
994 /* Another address from our subnet? */
995 if (ifa1->ifa_mask == prim->ifa_mask &&
996 inet_ifa_match(ifa1->ifa_address, prim))
997 prim1 = prim;
998 else {
999 /* We reached the secondaries, so
1000 * same_prefsrc should be determined.
1001 */
1002 if (!same_prefsrc)
1003 continue;
1004 /* Search new prim1 if ifa1 is not
1005 * using the current prim1
1006 */
1007 if (!prim1 ||
1008 ifa1->ifa_mask != prim1->ifa_mask ||
1009 !inet_ifa_match(ifa1->ifa_address, prim1))
1010 prim1 = inet_ifa_byprefix(in_dev,
1011 ifa1->ifa_address,
1012 ifa1->ifa_mask);
1013 if (!prim1)
1014 continue;
1015 if (prim1->ifa_local != prim->ifa_local)
1016 continue;
1017 }
1018 } else {
1019 if (prim->ifa_local != ifa1->ifa_local)
1020 continue;
1021 prim1 = ifa1;
1022 if (prim != prim1)
1023 same_prefsrc = 1;
1024 }
1025 if (ifa->ifa_local == ifa1->ifa_local)
1026 ok |= LOCAL_OK;
1027 if (ifa->ifa_broadcast == ifa1->ifa_broadcast)
1028 ok |= BRD_OK;
1029 if (brd == ifa1->ifa_broadcast)
1030 ok |= BRD1_OK;
1031 if (any == ifa1->ifa_broadcast)
1032 ok |= BRD0_OK;
1033 /* primary has network specific broadcasts */
1034 if (prim1 == ifa1 && ifa1->ifa_prefixlen < 31) {
1035 __be32 brd1 = ifa1->ifa_address | ~ifa1->ifa_mask;
1036 __be32 any1 = ifa1->ifa_address & ifa1->ifa_mask;
1037
1038 if (!ipv4_is_zeronet(any1)) {
1039 if (ifa->ifa_broadcast == brd1 ||
1040 ifa->ifa_broadcast == any1)
1041 ok |= BRD_OK;
1042 if (brd == brd1 || brd == any1)
1043 ok |= BRD1_OK;
1044 if (any == brd1 || any == any1)
1045 ok |= BRD0_OK;
1046 }
1047 }
1048 }
1049
1050 no_promotions:
1051 if (!(ok & BRD_OK))
1052 fib_magic(RTM_DELROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim);
1053 if (subnet && ifa->ifa_prefixlen < 31) {
1054 if (!(ok & BRD1_OK))
1055 fib_magic(RTM_DELROUTE, RTN_BROADCAST, brd, 32, prim);
1056 if (!(ok & BRD0_OK))
1057 fib_magic(RTM_DELROUTE, RTN_BROADCAST, any, 32, prim);
1058 }
1059 if (!(ok & LOCAL_OK)) {
1060 unsigned int addr_type;
1061
1062 fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 32, prim);
1063
1064 /* Check, that this local address finally disappeared. */
1065 addr_type = inet_addr_type_dev_table(dev_net(dev), dev,
1066 ifa->ifa_local);
1067 if (gone && addr_type != RTN_LOCAL) {
1068 /* And the last, but not the least thing.
1069 * We must flush stray FIB entries.
1070 *
1071 * First of all, we scan fib_info list searching
1072 * for stray nexthop entries, then ignite fib_flush.
1073 */
1074 if (fib_sync_down_addr(dev, ifa->ifa_local))
1075 fib_flush(dev_net(dev));
1076 }
1077 }
1078 #undef LOCAL_OK
1079 #undef BRD_OK
1080 #undef BRD0_OK
1081 #undef BRD1_OK
1082 }
1083
1084 static void nl_fib_lookup(struct net *net, struct fib_result_nl *frn)
1085 {
1086
1087 struct fib_result res;
1088 struct flowi4 fl4 = {
1089 .flowi4_mark = frn->fl_mark,
1090 .daddr = frn->fl_addr,
1091 .flowi4_tos = frn->fl_tos,
1092 .flowi4_scope = frn->fl_scope,
1093 };
1094 struct fib_table *tb;
1095
1096 rcu_read_lock();
1097
1098 tb = fib_get_table(net, frn->tb_id_in);
1099
1100 frn->err = -ENOENT;
1101 if (tb) {
1102 local_bh_disable();
1103
1104 frn->tb_id = tb->tb_id;
1105 frn->err = fib_table_lookup(tb, &fl4, &res, FIB_LOOKUP_NOREF);
1106
1107 if (!frn->err) {
1108 frn->prefixlen = res.prefixlen;
1109 frn->nh_sel = res.nh_sel;
1110 frn->type = res.type;
1111 frn->scope = res.scope;
1112 }
1113 local_bh_enable();
1114 }
1115
1116 rcu_read_unlock();
1117 }
1118
1119 static void nl_fib_input(struct sk_buff *skb)
1120 {
1121 struct net *net;
1122 struct fib_result_nl *frn;
1123 struct nlmsghdr *nlh;
1124 u32 portid;
1125
1126 net = sock_net(skb->sk);
1127 nlh = nlmsg_hdr(skb);
1128 if (skb->len < nlmsg_total_size(sizeof(*frn)) ||
1129 skb->len < nlh->nlmsg_len ||
1130 nlmsg_len(nlh) < sizeof(*frn))
1131 return;
1132
1133 skb = netlink_skb_clone(skb, GFP_KERNEL);
1134 if (!skb)
1135 return;
1136 nlh = nlmsg_hdr(skb);
1137
1138 frn = (struct fib_result_nl *) nlmsg_data(nlh);
1139 nl_fib_lookup(net, frn);
1140
1141 portid = NETLINK_CB(skb).portid; /* netlink portid */
1142 NETLINK_CB(skb).portid = 0; /* from kernel */
1143 NETLINK_CB(skb).dst_group = 0; /* unicast */
1144 netlink_unicast(net->ipv4.fibnl, skb, portid, MSG_DONTWAIT);
1145 }
1146
1147 static int __net_init nl_fib_lookup_init(struct net *net)
1148 {
1149 struct sock *sk;
1150 struct netlink_kernel_cfg cfg = {
1151 .input = nl_fib_input,
1152 };
1153
1154 sk = netlink_kernel_create(net, NETLINK_FIB_LOOKUP, &cfg);
1155 if (!sk)
1156 return -EAFNOSUPPORT;
1157 net->ipv4.fibnl = sk;
1158 return 0;
1159 }
1160
1161 static void nl_fib_lookup_exit(struct net *net)
1162 {
1163 netlink_kernel_release(net->ipv4.fibnl);
1164 net->ipv4.fibnl = NULL;
1165 }
1166
1167 static void fib_disable_ip(struct net_device *dev, unsigned long event,
1168 bool force)
1169 {
1170 if (fib_sync_down_dev(dev, event, force))
1171 fib_flush(dev_net(dev));
1172 else
1173 rt_cache_flush(dev_net(dev));
1174 arp_ifdown(dev);
1175 }
1176
1177 static int fib_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
1178 {
1179 struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
1180 struct net_device *dev = ifa->ifa_dev->dev;
1181 struct net *net = dev_net(dev);
1182
1183 switch (event) {
1184 case NETDEV_UP:
1185 fib_add_ifaddr(ifa);
1186 #ifdef CONFIG_IP_ROUTE_MULTIPATH
1187 fib_sync_up(dev, RTNH_F_DEAD);
1188 #endif
1189 atomic_inc(&net->ipv4.dev_addr_genid);
1190 rt_cache_flush(dev_net(dev));
1191 break;
1192 case NETDEV_DOWN:
1193 fib_del_ifaddr(ifa, NULL);
1194 atomic_inc(&net->ipv4.dev_addr_genid);
1195 if (!ifa->ifa_dev->ifa_list) {
1196 /* Last address was deleted from this interface.
1197 * Disable IP.
1198 */
1199 fib_disable_ip(dev, event, true);
1200 } else {
1201 rt_cache_flush(dev_net(dev));
1202 }
1203 break;
1204 }
1205 return NOTIFY_DONE;
1206 }
1207
1208 static int fib_netdev_event(struct notifier_block *this, unsigned long event, void *ptr)
1209 {
1210 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1211 struct netdev_notifier_changeupper_info *info;
1212 struct in_device *in_dev;
1213 struct net *net = dev_net(dev);
1214 unsigned int flags;
1215
1216 if (event == NETDEV_UNREGISTER) {
1217 fib_disable_ip(dev, event, true);
1218 rt_flush_dev(dev);
1219 return NOTIFY_DONE;
1220 }
1221
1222 in_dev = __in_dev_get_rtnl(dev);
1223 if (!in_dev)
1224 return NOTIFY_DONE;
1225
1226 switch (event) {
1227 case NETDEV_UP:
1228 for_ifa(in_dev) {
1229 fib_add_ifaddr(ifa);
1230 } endfor_ifa(in_dev);
1231 #ifdef CONFIG_IP_ROUTE_MULTIPATH
1232 fib_sync_up(dev, RTNH_F_DEAD);
1233 #endif
1234 atomic_inc(&net->ipv4.dev_addr_genid);
1235 rt_cache_flush(net);
1236 break;
1237 case NETDEV_DOWN:
1238 fib_disable_ip(dev, event, false);
1239 break;
1240 case NETDEV_CHANGE:
1241 flags = dev_get_flags(dev);
1242 if (flags & (IFF_RUNNING | IFF_LOWER_UP))
1243 fib_sync_up(dev, RTNH_F_LINKDOWN);
1244 else
1245 fib_sync_down_dev(dev, event, false);
1246 /* fall through */
1247 case NETDEV_CHANGEMTU:
1248 rt_cache_flush(net);
1249 break;
1250 case NETDEV_CHANGEUPPER:
1251 info = ptr;
1252 /* flush all routes if dev is linked to or unlinked from
1253 * an L3 master device (e.g., VRF)
1254 */
1255 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
1256 fib_disable_ip(dev, NETDEV_DOWN, true);
1257 break;
1258 }
1259 return NOTIFY_DONE;
1260 }
1261
1262 static struct notifier_block fib_inetaddr_notifier = {
1263 .notifier_call = fib_inetaddr_event,
1264 };
1265
1266 static struct notifier_block fib_netdev_notifier = {
1267 .notifier_call = fib_netdev_event,
1268 };
1269
1270 static int __net_init ip_fib_net_init(struct net *net)
1271 {
1272 int err;
1273 size_t size = sizeof(struct hlist_head) * FIB_TABLE_HASHSZ;
1274
1275 err = fib4_notifier_init(net);
1276 if (err)
1277 return err;
1278
1279 /* Avoid false sharing : Use at least a full cache line */
1280 size = max_t(size_t, size, L1_CACHE_BYTES);
1281
1282 net->ipv4.fib_table_hash = kzalloc(size, GFP_KERNEL);
1283 if (!net->ipv4.fib_table_hash) {
1284 err = -ENOMEM;
1285 goto err_table_hash_alloc;
1286 }
1287
1288 err = fib4_rules_init(net);
1289 if (err < 0)
1290 goto err_rules_init;
1291 return 0;
1292
1293 err_rules_init:
1294 kfree(net->ipv4.fib_table_hash);
1295 err_table_hash_alloc:
1296 fib4_notifier_exit(net);
1297 return err;
1298 }
1299
1300 static void ip_fib_net_exit(struct net *net)
1301 {
1302 int i;
1303
1304 rtnl_lock();
1305 #ifdef CONFIG_IP_MULTIPLE_TABLES
1306 RCU_INIT_POINTER(net->ipv4.fib_main, NULL);
1307 RCU_INIT_POINTER(net->ipv4.fib_default, NULL);
1308 #endif
1309 /* Destroy the tables in reverse order to guarantee that the
1310 * local table, ID 255, is destroyed before the main table, ID
1311 * 254. This is necessary as the local table may contain
1312 * references to data contained in the main table.
1313 */
1314 for (i = FIB_TABLE_HASHSZ - 1; i >= 0; i--) {
1315 struct hlist_head *head = &net->ipv4.fib_table_hash[i];
1316 struct hlist_node *tmp;
1317 struct fib_table *tb;
1318
1319 hlist_for_each_entry_safe(tb, tmp, head, tb_hlist) {
1320 hlist_del(&tb->tb_hlist);
1321 fib_table_flush(net, tb);
1322 fib_free_table(tb);
1323 }
1324 }
1325
1326 #ifdef CONFIG_IP_MULTIPLE_TABLES
1327 fib4_rules_exit(net);
1328 #endif
1329 rtnl_unlock();
1330 kfree(net->ipv4.fib_table_hash);
1331 fib4_notifier_exit(net);
1332 }
1333
1334 static int __net_init fib_net_init(struct net *net)
1335 {
1336 int error;
1337
1338 #ifdef CONFIG_IP_ROUTE_CLASSID
1339 net->ipv4.fib_num_tclassid_users = 0;
1340 #endif
1341 error = ip_fib_net_init(net);
1342 if (error < 0)
1343 goto out;
1344 error = nl_fib_lookup_init(net);
1345 if (error < 0)
1346 goto out_nlfl;
1347 error = fib_proc_init(net);
1348 if (error < 0)
1349 goto out_proc;
1350 out:
1351 return error;
1352
1353 out_proc:
1354 nl_fib_lookup_exit(net);
1355 out_nlfl:
1356 ip_fib_net_exit(net);
1357 goto out;
1358 }
1359
1360 static void __net_exit fib_net_exit(struct net *net)
1361 {
1362 fib_proc_exit(net);
1363 nl_fib_lookup_exit(net);
1364 ip_fib_net_exit(net);
1365 }
1366
1367 static struct pernet_operations fib_net_ops = {
1368 .init = fib_net_init,
1369 .exit = fib_net_exit,
1370 };
1371
1372 void __init ip_fib_init(void)
1373 {
1374 fib_trie_init();
1375
1376 register_pernet_subsys(&fib_net_ops);
1377
1378 register_netdevice_notifier(&fib_netdev_notifier);
1379 register_inetaddr_notifier(&fib_inetaddr_notifier);
1380
1381 rtnl_register(PF_INET, RTM_NEWROUTE, inet_rtm_newroute, NULL, 0);
1382 rtnl_register(PF_INET, RTM_DELROUTE, inet_rtm_delroute, NULL, 0);
1383 rtnl_register(PF_INET, RTM_GETROUTE, NULL, inet_dump_fib, 0);
1384 }
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