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treewide: kzalloc() -> kcalloc()
[linux-2.6/btrfs-unstable.git] / net / ipv4 / fib_frontend.c
blobb21833651394233bbdb143d765e4408333b13b72
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 struct net *net = dev_net(dev);
330 struct flow_keys flkeys;
331 int ret, no_addr;
332 struct fib_result res;
333 struct flowi4 fl4;
334 bool dev_match;
335
336 fl4.flowi4_oif = 0;
337 fl4.flowi4_iif = l3mdev_master_ifindex_rcu(dev);
338 if (!fl4.flowi4_iif)
339 fl4.flowi4_iif = oif ? : LOOPBACK_IFINDEX;
340 fl4.daddr = src;
341 fl4.saddr = dst;
342 fl4.flowi4_tos = tos;
343 fl4.flowi4_scope = RT_SCOPE_UNIVERSE;
344 fl4.flowi4_tun_key.tun_id = 0;
345 fl4.flowi4_flags = 0;
346 fl4.flowi4_uid = sock_net_uid(net, NULL);
347
348 no_addr = idev->ifa_list == NULL;
349
350 fl4.flowi4_mark = IN_DEV_SRC_VMARK(idev) ? skb->mark : 0;
351 if (!fib4_rules_early_flow_dissect(net, skb, &fl4, &flkeys)) {
352 fl4.flowi4_proto = 0;
353 fl4.fl4_sport = 0;
354 fl4.fl4_dport = 0;
355 }
356
357 if (fib_lookup(net, &fl4, &res, 0))
358 goto last_resort;
359 if (res.type != RTN_UNICAST &&
360 (res.type != RTN_LOCAL || !IN_DEV_ACCEPT_LOCAL(idev)))
361 goto e_inval;
362 fib_combine_itag(itag, &res);
363 dev_match = false;
364
365 #ifdef CONFIG_IP_ROUTE_MULTIPATH
366 for (ret = 0; ret < res.fi->fib_nhs; ret++) {
367 struct fib_nh *nh = &res.fi->fib_nh[ret];
368
369 if (nh->nh_dev == dev) {
370 dev_match = true;
371 break;
372 } else if (l3mdev_master_ifindex_rcu(nh->nh_dev) == dev->ifindex) {
373 dev_match = true;
374 break;
375 }
376 }
377 #else
378 if (FIB_RES_DEV(res) == dev)
379 dev_match = true;
380 #endif
381 if (dev_match) {
382 ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST;
383 return ret;
384 }
385 if (no_addr)
386 goto last_resort;
387 if (rpf == 1)
388 goto e_rpf;
389 fl4.flowi4_oif = dev->ifindex;
390
391 ret = 0;
392 if (fib_lookup(net, &fl4, &res, FIB_LOOKUP_IGNORE_LINKSTATE) == 0) {
393 if (res.type == RTN_UNICAST)
394 ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST;
395 }
396 return ret;
397
398 last_resort:
399 if (rpf)
400 goto e_rpf;
401 *itag = 0;
402 return 0;
403
404 e_inval:
405 return -EINVAL;
406 e_rpf:
407 return -EXDEV;
408 }
409
410 /* Ignore rp_filter for packets protected by IPsec. */
411 int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst,
412 u8 tos, int oif, struct net_device *dev,
413 struct in_device *idev, u32 *itag)
414 {
415 int r = secpath_exists(skb) ? 0 : IN_DEV_RPFILTER(idev);
416 struct net *net = dev_net(dev);
417
418 if (!r && !fib_num_tclassid_users(net) &&
419 (dev->ifindex != oif || !IN_DEV_TX_REDIRECTS(idev))) {
420 if (IN_DEV_ACCEPT_LOCAL(idev))
421 goto ok;
422 /* with custom local routes in place, checking local addresses
423 * only will be too optimistic, with custom rules, checking
424 * local addresses only can be too strict, e.g. due to vrf
425 */
426 if (net->ipv4.fib_has_custom_local_routes ||
427 fib4_has_custom_rules(net))
428 goto full_check;
429 if (inet_lookup_ifaddr_rcu(net, src))
430 return -EINVAL;
431
432 ok:
433 *itag = 0;
434 return 0;
435 }
436
437 full_check:
438 return __fib_validate_source(skb, src, dst, tos, oif, dev, r, idev, itag);
439 }
440
441 static inline __be32 sk_extract_addr(struct sockaddr *addr)
442 {
443 return ((struct sockaddr_in *) addr)->sin_addr.s_addr;
444 }
445
446 static int put_rtax(struct nlattr *mx, int len, int type, u32 value)
447 {
448 struct nlattr *nla;
449
450 nla = (struct nlattr *) ((char *) mx + len);
451 nla->nla_type = type;
452 nla->nla_len = nla_attr_size(4);
453 *(u32 *) nla_data(nla) = value;
454
455 return len + nla_total_size(4);
456 }
457
458 static int rtentry_to_fib_config(struct net *net, int cmd, struct rtentry *rt,
459 struct fib_config *cfg)
460 {
461 __be32 addr;
462 int plen;
463
464 memset(cfg, 0, sizeof(*cfg));
465 cfg->fc_nlinfo.nl_net = net;
466
467 if (rt->rt_dst.sa_family != AF_INET)
468 return -EAFNOSUPPORT;
469
470 /*
471 * Check mask for validity:
472 * a) it must be contiguous.
473 * b) destination must have all host bits clear.
474 * c) if application forgot to set correct family (AF_INET),
475 * reject request unless it is absolutely clear i.e.
476 * both family and mask are zero.
477 */
478 plen = 32;
479 addr = sk_extract_addr(&rt->rt_dst);
480 if (!(rt->rt_flags & RTF_HOST)) {
481 __be32 mask = sk_extract_addr(&rt->rt_genmask);
482
483 if (rt->rt_genmask.sa_family != AF_INET) {
484 if (mask || rt->rt_genmask.sa_family)
485 return -EAFNOSUPPORT;
486 }
487
488 if (bad_mask(mask, addr))
489 return -EINVAL;
490
491 plen = inet_mask_len(mask);
492 }
493
494 cfg->fc_dst_len = plen;
495 cfg->fc_dst = addr;
496
497 if (cmd != SIOCDELRT) {
498 cfg->fc_nlflags = NLM_F_CREATE;
499 cfg->fc_protocol = RTPROT_BOOT;
500 }
501
502 if (rt->rt_metric)
503 cfg->fc_priority = rt->rt_metric - 1;
504
505 if (rt->rt_flags & RTF_REJECT) {
506 cfg->fc_scope = RT_SCOPE_HOST;
507 cfg->fc_type = RTN_UNREACHABLE;
508 return 0;
509 }
510
511 cfg->fc_scope = RT_SCOPE_NOWHERE;
512 cfg->fc_type = RTN_UNICAST;
513
514 if (rt->rt_dev) {
515 char *colon;
516 struct net_device *dev;
517 char devname[IFNAMSIZ];
518
519 if (copy_from_user(devname, rt->rt_dev, IFNAMSIZ-1))
520 return -EFAULT;
521
522 devname[IFNAMSIZ-1] = 0;
523 colon = strchr(devname, ':');
524 if (colon)
525 *colon = 0;
526 dev = __dev_get_by_name(net, devname);
527 if (!dev)
528 return -ENODEV;
529 cfg->fc_oif = dev->ifindex;
530 cfg->fc_table = l3mdev_fib_table(dev);
531 if (colon) {
532 struct in_ifaddr *ifa;
533 struct in_device *in_dev = __in_dev_get_rtnl(dev);
534 if (!in_dev)
535 return -ENODEV;
536 *colon = ':';
537 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next)
538 if (strcmp(ifa->ifa_label, devname) == 0)
539 break;
540 if (!ifa)
541 return -ENODEV;
542 cfg->fc_prefsrc = ifa->ifa_local;
543 }
544 }
545
546 addr = sk_extract_addr(&rt->rt_gateway);
547 if (rt->rt_gateway.sa_family == AF_INET && addr) {
548 unsigned int addr_type;
549
550 cfg->fc_gw = addr;
551 addr_type = inet_addr_type_table(net, addr, cfg->fc_table);
552 if (rt->rt_flags & RTF_GATEWAY &&
553 addr_type == RTN_UNICAST)
554 cfg->fc_scope = RT_SCOPE_UNIVERSE;
555 }
556
557 if (cmd == SIOCDELRT)
558 return 0;
559
560 if (rt->rt_flags & RTF_GATEWAY && !cfg->fc_gw)
561 return -EINVAL;
562
563 if (cfg->fc_scope == RT_SCOPE_NOWHERE)
564 cfg->fc_scope = RT_SCOPE_LINK;
565
566 if (rt->rt_flags & (RTF_MTU | RTF_WINDOW | RTF_IRTT)) {
567 struct nlattr *mx;
568 int len = 0;
569
570 mx = kcalloc(3, nla_total_size(4), GFP_KERNEL);
571 if (!mx)
572 return -ENOMEM;
573
574 if (rt->rt_flags & RTF_MTU)
575 len = put_rtax(mx, len, RTAX_ADVMSS, rt->rt_mtu - 40);
576
577 if (rt->rt_flags & RTF_WINDOW)
578 len = put_rtax(mx, len, RTAX_WINDOW, rt->rt_window);
579
580 if (rt->rt_flags & RTF_IRTT)
581 len = put_rtax(mx, len, RTAX_RTT, rt->rt_irtt << 3);
582
583 cfg->fc_mx = mx;
584 cfg->fc_mx_len = len;
585 }
586
587 return 0;
588 }
589
590 /*
591 * Handle IP routing ioctl calls.
592 * These are used to manipulate the routing tables
593 */
594 int ip_rt_ioctl(struct net *net, unsigned int cmd, struct rtentry *rt)
595 {
596 struct fib_config cfg;
597 int err;
598
599 switch (cmd) {
600 case SIOCADDRT: /* Add a route */
601 case SIOCDELRT: /* Delete a route */
602 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
603 return -EPERM;
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 [RTA_IP_PROTO] = { .type = NLA_U8 },
652 [RTA_SPORT] = { .type = NLA_U16 },
653 [RTA_DPORT] = { .type = NLA_U16 },
654 };
655
656 static int rtm_to_fib_config(struct net *net, struct sk_buff *skb,
657 struct nlmsghdr *nlh, struct fib_config *cfg,
658 struct netlink_ext_ack *extack)
659 {
660 struct nlattr *attr;
661 int err, remaining;
662 struct rtmsg *rtm;
663
664 err = nlmsg_validate(nlh, sizeof(*rtm), RTA_MAX, rtm_ipv4_policy,
665 extack);
666 if (err < 0)
667 goto errout;
668
669 memset(cfg, 0, sizeof(*cfg));
670
671 rtm = nlmsg_data(nlh);
672 cfg->fc_dst_len = rtm->rtm_dst_len;
673 cfg->fc_tos = rtm->rtm_tos;
674 cfg->fc_table = rtm->rtm_table;
675 cfg->fc_protocol = rtm->rtm_protocol;
676 cfg->fc_scope = rtm->rtm_scope;
677 cfg->fc_type = rtm->rtm_type;
678 cfg->fc_flags = rtm->rtm_flags;
679 cfg->fc_nlflags = nlh->nlmsg_flags;
680
681 cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid;
682 cfg->fc_nlinfo.nlh = nlh;
683 cfg->fc_nlinfo.nl_net = net;
684
685 if (cfg->fc_type > RTN_MAX) {
686 NL_SET_ERR_MSG(extack, "Invalid route type");
687 err = -EINVAL;
688 goto errout;
689 }
690
691 nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), remaining) {
692 switch (nla_type(attr)) {
693 case RTA_DST:
694 cfg->fc_dst = nla_get_be32(attr);
695 break;
696 case RTA_OIF:
697 cfg->fc_oif = nla_get_u32(attr);
698 break;
699 case RTA_GATEWAY:
700 cfg->fc_gw = nla_get_be32(attr);
701 break;
702 case RTA_PRIORITY:
703 cfg->fc_priority = nla_get_u32(attr);
704 break;
705 case RTA_PREFSRC:
706 cfg->fc_prefsrc = nla_get_be32(attr);
707 break;
708 case RTA_METRICS:
709 cfg->fc_mx = nla_data(attr);
710 cfg->fc_mx_len = nla_len(attr);
711 break;
712 case RTA_MULTIPATH:
713 err = lwtunnel_valid_encap_type_attr(nla_data(attr),
714 nla_len(attr),
715 extack);
716 if (err < 0)
717 goto errout;
718 cfg->fc_mp = nla_data(attr);
719 cfg->fc_mp_len = nla_len(attr);
720 break;
721 case RTA_FLOW:
722 cfg->fc_flow = nla_get_u32(attr);
723 break;
724 case RTA_TABLE:
725 cfg->fc_table = nla_get_u32(attr);
726 break;
727 case RTA_ENCAP:
728 cfg->fc_encap = attr;
729 break;
730 case RTA_ENCAP_TYPE:
731 cfg->fc_encap_type = nla_get_u16(attr);
732 err = lwtunnel_valid_encap_type(cfg->fc_encap_type,
733 extack);
734 if (err < 0)
735 goto errout;
736 break;
737 }
738 }
739
740 return 0;
741 errout:
742 return err;
743 }
744
745 static int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh,
746 struct netlink_ext_ack *extack)
747 {
748 struct net *net = sock_net(skb->sk);
749 struct fib_config cfg;
750 struct fib_table *tb;
751 int err;
752
753 err = rtm_to_fib_config(net, skb, nlh, &cfg, extack);
754 if (err < 0)
755 goto errout;
756
757 tb = fib_get_table(net, cfg.fc_table);
758 if (!tb) {
759 NL_SET_ERR_MSG(extack, "FIB table does not exist");
760 err = -ESRCH;
761 goto errout;
762 }
763
764 err = fib_table_delete(net, tb, &cfg, extack);
765 errout:
766 return err;
767 }
768
769 static int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh,
770 struct netlink_ext_ack *extack)
771 {
772 struct net *net = sock_net(skb->sk);
773 struct fib_config cfg;
774 struct fib_table *tb;
775 int err;
776
777 err = rtm_to_fib_config(net, skb, nlh, &cfg, extack);
778 if (err < 0)
779 goto errout;
780
781 tb = fib_new_table(net, cfg.fc_table);
782 if (!tb) {
783 err = -ENOBUFS;
784 goto errout;
785 }
786
787 err = fib_table_insert(net, tb, &cfg, extack);
788 if (!err && cfg.fc_type == RTN_LOCAL)
789 net->ipv4.fib_has_custom_local_routes = true;
790 errout:
791 return err;
792 }
793
794 static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb)
795 {
796 struct net *net = sock_net(skb->sk);
797 unsigned int h, s_h;
798 unsigned int e = 0, s_e;
799 struct fib_table *tb;
800 struct hlist_head *head;
801 int dumped = 0, err;
802
803 if (nlmsg_len(cb->nlh) >= sizeof(struct rtmsg) &&
804 ((struct rtmsg *) nlmsg_data(cb->nlh))->rtm_flags & RTM_F_CLONED)
805 return skb->len;
806
807 s_h = cb->args[0];
808 s_e = cb->args[1];
809
810 rcu_read_lock();
811
812 for (h = s_h; h < FIB_TABLE_HASHSZ; h++, s_e = 0) {
813 e = 0;
814 head = &net->ipv4.fib_table_hash[h];
815 hlist_for_each_entry_rcu(tb, head, tb_hlist) {
816 if (e < s_e)
817 goto next;
818 if (dumped)
819 memset(&cb->args[2], 0, sizeof(cb->args) -
820 2 * sizeof(cb->args[0]));
821 err = fib_table_dump(tb, skb, cb);
822 if (err < 0) {
823 if (likely(skb->len))
824 goto out;
825
826 goto out_err;
827 }
828 dumped = 1;
829 next:
830 e++;
831 }
832 }
833 out:
834 err = skb->len;
835 out_err:
836 rcu_read_unlock();
837
838 cb->args[1] = e;
839 cb->args[0] = h;
840
841 return err;
842 }
843
844 /* Prepare and feed intra-kernel routing request.
845 * Really, it should be netlink message, but :-( netlink
846 * can be not configured, so that we feed it directly
847 * to fib engine. It is legal, because all events occur
848 * only when netlink is already locked.
849 */
850 static void fib_magic(int cmd, int type, __be32 dst, int dst_len,
851 struct in_ifaddr *ifa, u32 rt_priority)
852 {
853 struct net *net = dev_net(ifa->ifa_dev->dev);
854 u32 tb_id = l3mdev_fib_table(ifa->ifa_dev->dev);
855 struct fib_table *tb;
856 struct fib_config cfg = {
857 .fc_protocol = RTPROT_KERNEL,
858 .fc_type = type,
859 .fc_dst = dst,
860 .fc_dst_len = dst_len,
861 .fc_priority = rt_priority,
862 .fc_prefsrc = ifa->ifa_local,
863 .fc_oif = ifa->ifa_dev->dev->ifindex,
864 .fc_nlflags = NLM_F_CREATE | NLM_F_APPEND,
865 .fc_nlinfo = {
866 .nl_net = net,
867 },
868 };
869
870 if (!tb_id)
871 tb_id = (type == RTN_UNICAST) ? RT_TABLE_MAIN : RT_TABLE_LOCAL;
872
873 tb = fib_new_table(net, tb_id);
874 if (!tb)
875 return;
876
877 cfg.fc_table = tb->tb_id;
878
879 if (type != RTN_LOCAL)
880 cfg.fc_scope = RT_SCOPE_LINK;
881 else
882 cfg.fc_scope = RT_SCOPE_HOST;
883
884 if (cmd == RTM_NEWROUTE)
885 fib_table_insert(net, tb, &cfg, NULL);
886 else
887 fib_table_delete(net, tb, &cfg, NULL);
888 }
889
890 void fib_add_ifaddr(struct in_ifaddr *ifa)
891 {
892 struct in_device *in_dev = ifa->ifa_dev;
893 struct net_device *dev = in_dev->dev;
894 struct in_ifaddr *prim = ifa;
895 __be32 mask = ifa->ifa_mask;
896 __be32 addr = ifa->ifa_local;
897 __be32 prefix = ifa->ifa_address & mask;
898
899 if (ifa->ifa_flags & IFA_F_SECONDARY) {
900 prim = inet_ifa_byprefix(in_dev, prefix, mask);
901 if (!prim) {
902 pr_warn("%s: bug: prim == NULL\n", __func__);
903 return;
904 }
905 }
906
907 fib_magic(RTM_NEWROUTE, RTN_LOCAL, addr, 32, prim, 0);
908
909 if (!(dev->flags & IFF_UP))
910 return;
911
912 /* Add broadcast address, if it is explicitly assigned. */
913 if (ifa->ifa_broadcast && ifa->ifa_broadcast != htonl(0xFFFFFFFF))
914 fib_magic(RTM_NEWROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32,
915 prim, 0);
916
917 if (!ipv4_is_zeronet(prefix) && !(ifa->ifa_flags & IFA_F_SECONDARY) &&
918 (prefix != addr || ifa->ifa_prefixlen < 32)) {
919 if (!(ifa->ifa_flags & IFA_F_NOPREFIXROUTE))
920 fib_magic(RTM_NEWROUTE,
921 dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST,
922 prefix, ifa->ifa_prefixlen, prim,
923 ifa->ifa_rt_priority);
924
925 /* Add network specific broadcasts, when it takes a sense */
926 if (ifa->ifa_prefixlen < 31) {
927 fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix, 32,
928 prim, 0);
929 fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix | ~mask,
930 32, prim, 0);
931 }
932 }
933 }
934
935 void fib_modify_prefix_metric(struct in_ifaddr *ifa, u32 new_metric)
936 {
937 __be32 prefix = ifa->ifa_address & ifa->ifa_mask;
938 struct in_device *in_dev = ifa->ifa_dev;
939 struct net_device *dev = in_dev->dev;
940
941 if (!(dev->flags & IFF_UP) ||
942 ifa->ifa_flags & (IFA_F_SECONDARY | IFA_F_NOPREFIXROUTE) ||
943 ipv4_is_zeronet(prefix) ||
944 prefix == ifa->ifa_local || ifa->ifa_prefixlen == 32)
945 return;
946
947 /* add the new */
948 fib_magic(RTM_NEWROUTE,
949 dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST,
950 prefix, ifa->ifa_prefixlen, ifa, new_metric);
951
952 /* delete the old */
953 fib_magic(RTM_DELROUTE,
954 dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST,
955 prefix, ifa->ifa_prefixlen, ifa, ifa->ifa_rt_priority);
956 }
957
958 /* Delete primary or secondary address.
959 * Optionally, on secondary address promotion consider the addresses
960 * from subnet iprim as deleted, even if they are in device list.
961 * In this case the secondary ifa can be in device list.
962 */
963 void fib_del_ifaddr(struct in_ifaddr *ifa, struct in_ifaddr *iprim)
964 {
965 struct in_device *in_dev = ifa->ifa_dev;
966 struct net_device *dev = in_dev->dev;
967 struct in_ifaddr *ifa1;
968 struct in_ifaddr *prim = ifa, *prim1 = NULL;
969 __be32 brd = ifa->ifa_address | ~ifa->ifa_mask;
970 __be32 any = ifa->ifa_address & ifa->ifa_mask;
971 #define LOCAL_OK 1
972 #define BRD_OK 2
973 #define BRD0_OK 4
974 #define BRD1_OK 8
975 unsigned int ok = 0;
976 int subnet = 0; /* Primary network */
977 int gone = 1; /* Address is missing */
978 int same_prefsrc = 0; /* Another primary with same IP */
979
980 if (ifa->ifa_flags & IFA_F_SECONDARY) {
981 prim = inet_ifa_byprefix(in_dev, any, ifa->ifa_mask);
982 if (!prim) {
983 /* if the device has been deleted, we don't perform
984 * address promotion
985 */
986 if (!in_dev->dead)
987 pr_warn("%s: bug: prim == NULL\n", __func__);
988 return;
989 }
990 if (iprim && iprim != prim) {
991 pr_warn("%s: bug: iprim != prim\n", __func__);
992 return;
993 }
994 } else if (!ipv4_is_zeronet(any) &&
995 (any != ifa->ifa_local || ifa->ifa_prefixlen < 32)) {
996 if (!(ifa->ifa_flags & IFA_F_NOPREFIXROUTE))
997 fib_magic(RTM_DELROUTE,
998 dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST,
999 any, ifa->ifa_prefixlen, prim, 0);
1000 subnet = 1;
1001 }
1002
1003 if (in_dev->dead)
1004 goto no_promotions;
1005
1006 /* Deletion is more complicated than add.
1007 * We should take care of not to delete too much :-)
1008 *
1009 * Scan address list to be sure that addresses are really gone.
1010 */
1011
1012 for (ifa1 = in_dev->ifa_list; ifa1; ifa1 = ifa1->ifa_next) {
1013 if (ifa1 == ifa) {
1014 /* promotion, keep the IP */
1015 gone = 0;
1016 continue;
1017 }
1018 /* Ignore IFAs from our subnet */
1019 if (iprim && ifa1->ifa_mask == iprim->ifa_mask &&
1020 inet_ifa_match(ifa1->ifa_address, iprim))
1021 continue;
1022
1023 /* Ignore ifa1 if it uses different primary IP (prefsrc) */
1024 if (ifa1->ifa_flags & IFA_F_SECONDARY) {
1025 /* Another address from our subnet? */
1026 if (ifa1->ifa_mask == prim->ifa_mask &&
1027 inet_ifa_match(ifa1->ifa_address, prim))
1028 prim1 = prim;
1029 else {
1030 /* We reached the secondaries, so
1031 * same_prefsrc should be determined.
1032 */
1033 if (!same_prefsrc)
1034 continue;
1035 /* Search new prim1 if ifa1 is not
1036 * using the current prim1
1037 */
1038 if (!prim1 ||
1039 ifa1->ifa_mask != prim1->ifa_mask ||
1040 !inet_ifa_match(ifa1->ifa_address, prim1))
1041 prim1 = inet_ifa_byprefix(in_dev,
1042 ifa1->ifa_address,
1043 ifa1->ifa_mask);
1044 if (!prim1)
1045 continue;
1046 if (prim1->ifa_local != prim->ifa_local)
1047 continue;
1048 }
1049 } else {
1050 if (prim->ifa_local != ifa1->ifa_local)
1051 continue;
1052 prim1 = ifa1;
1053 if (prim != prim1)
1054 same_prefsrc = 1;
1055 }
1056 if (ifa->ifa_local == ifa1->ifa_local)
1057 ok |= LOCAL_OK;
1058 if (ifa->ifa_broadcast == ifa1->ifa_broadcast)
1059 ok |= BRD_OK;
1060 if (brd == ifa1->ifa_broadcast)
1061 ok |= BRD1_OK;
1062 if (any == ifa1->ifa_broadcast)
1063 ok |= BRD0_OK;
1064 /* primary has network specific broadcasts */
1065 if (prim1 == ifa1 && ifa1->ifa_prefixlen < 31) {
1066 __be32 brd1 = ifa1->ifa_address | ~ifa1->ifa_mask;
1067 __be32 any1 = ifa1->ifa_address & ifa1->ifa_mask;
1068
1069 if (!ipv4_is_zeronet(any1)) {
1070 if (ifa->ifa_broadcast == brd1 ||
1071 ifa->ifa_broadcast == any1)
1072 ok |= BRD_OK;
1073 if (brd == brd1 || brd == any1)
1074 ok |= BRD1_OK;
1075 if (any == brd1 || any == any1)
1076 ok |= BRD0_OK;
1077 }
1078 }
1079 }
1080
1081 no_promotions:
1082 if (!(ok & BRD_OK))
1083 fib_magic(RTM_DELROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32,
1084 prim, 0);
1085 if (subnet && ifa->ifa_prefixlen < 31) {
1086 if (!(ok & BRD1_OK))
1087 fib_magic(RTM_DELROUTE, RTN_BROADCAST, brd, 32,
1088 prim, 0);
1089 if (!(ok & BRD0_OK))
1090 fib_magic(RTM_DELROUTE, RTN_BROADCAST, any, 32,
1091 prim, 0);
1092 }
1093 if (!(ok & LOCAL_OK)) {
1094 unsigned int addr_type;
1095
1096 fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 32, prim, 0);
1097
1098 /* Check, that this local address finally disappeared. */
1099 addr_type = inet_addr_type_dev_table(dev_net(dev), dev,
1100 ifa->ifa_local);
1101 if (gone && addr_type != RTN_LOCAL) {
1102 /* And the last, but not the least thing.
1103 * We must flush stray FIB entries.
1104 *
1105 * First of all, we scan fib_info list searching
1106 * for stray nexthop entries, then ignite fib_flush.
1107 */
1108 if (fib_sync_down_addr(dev, ifa->ifa_local))
1109 fib_flush(dev_net(dev));
1110 }
1111 }
1112 #undef LOCAL_OK
1113 #undef BRD_OK
1114 #undef BRD0_OK
1115 #undef BRD1_OK
1116 }
1117
1118 static void nl_fib_lookup(struct net *net, struct fib_result_nl *frn)
1119 {
1120
1121 struct fib_result res;
1122 struct flowi4 fl4 = {
1123 .flowi4_mark = frn->fl_mark,
1124 .daddr = frn->fl_addr,
1125 .flowi4_tos = frn->fl_tos,
1126 .flowi4_scope = frn->fl_scope,
1127 };
1128 struct fib_table *tb;
1129
1130 rcu_read_lock();
1131
1132 tb = fib_get_table(net, frn->tb_id_in);
1133
1134 frn->err = -ENOENT;
1135 if (tb) {
1136 local_bh_disable();
1137
1138 frn->tb_id = tb->tb_id;
1139 frn->err = fib_table_lookup(tb, &fl4, &res, FIB_LOOKUP_NOREF);
1140
1141 if (!frn->err) {
1142 frn->prefixlen = res.prefixlen;
1143 frn->nh_sel = res.nh_sel;
1144 frn->type = res.type;
1145 frn->scope = res.scope;
1146 }
1147 local_bh_enable();
1148 }
1149
1150 rcu_read_unlock();
1151 }
1152
1153 static void nl_fib_input(struct sk_buff *skb)
1154 {
1155 struct net *net;
1156 struct fib_result_nl *frn;
1157 struct nlmsghdr *nlh;
1158 u32 portid;
1159
1160 net = sock_net(skb->sk);
1161 nlh = nlmsg_hdr(skb);
1162 if (skb->len < nlmsg_total_size(sizeof(*frn)) ||
1163 skb->len < nlh->nlmsg_len ||
1164 nlmsg_len(nlh) < sizeof(*frn))
1165 return;
1166
1167 skb = netlink_skb_clone(skb, GFP_KERNEL);
1168 if (!skb)
1169 return;
1170 nlh = nlmsg_hdr(skb);
1171
1172 frn = (struct fib_result_nl *) nlmsg_data(nlh);
1173 nl_fib_lookup(net, frn);
1174
1175 portid = NETLINK_CB(skb).portid; /* netlink portid */
1176 NETLINK_CB(skb).portid = 0; /* from kernel */
1177 NETLINK_CB(skb).dst_group = 0; /* unicast */
1178 netlink_unicast(net->ipv4.fibnl, skb, portid, MSG_DONTWAIT);
1179 }
1180
1181 static int __net_init nl_fib_lookup_init(struct net *net)
1182 {
1183 struct sock *sk;
1184 struct netlink_kernel_cfg cfg = {
1185 .input = nl_fib_input,
1186 };
1187
1188 sk = netlink_kernel_create(net, NETLINK_FIB_LOOKUP, &cfg);
1189 if (!sk)
1190 return -EAFNOSUPPORT;
1191 net->ipv4.fibnl = sk;
1192 return 0;
1193 }
1194
1195 static void nl_fib_lookup_exit(struct net *net)
1196 {
1197 netlink_kernel_release(net->ipv4.fibnl);
1198 net->ipv4.fibnl = NULL;
1199 }
1200
1201 static void fib_disable_ip(struct net_device *dev, unsigned long event,
1202 bool force)
1203 {
1204 if (fib_sync_down_dev(dev, event, force))
1205 fib_flush(dev_net(dev));
1206 else
1207 rt_cache_flush(dev_net(dev));
1208 arp_ifdown(dev);
1209 }
1210
1211 static int fib_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
1212 {
1213 struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
1214 struct net_device *dev = ifa->ifa_dev->dev;
1215 struct net *net = dev_net(dev);
1216
1217 switch (event) {
1218 case NETDEV_UP:
1219 fib_add_ifaddr(ifa);
1220 #ifdef CONFIG_IP_ROUTE_MULTIPATH
1221 fib_sync_up(dev, RTNH_F_DEAD);
1222 #endif
1223 atomic_inc(&net->ipv4.dev_addr_genid);
1224 rt_cache_flush(dev_net(dev));
1225 break;
1226 case NETDEV_DOWN:
1227 fib_del_ifaddr(ifa, NULL);
1228 atomic_inc(&net->ipv4.dev_addr_genid);
1229 if (!ifa->ifa_dev->ifa_list) {
1230 /* Last address was deleted from this interface.
1231 * Disable IP.
1232 */
1233 fib_disable_ip(dev, event, true);
1234 } else {
1235 rt_cache_flush(dev_net(dev));
1236 }
1237 break;
1238 }
1239 return NOTIFY_DONE;
1240 }
1241
1242 static int fib_netdev_event(struct notifier_block *this, unsigned long event, void *ptr)
1243 {
1244 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1245 struct netdev_notifier_changeupper_info *info;
1246 struct in_device *in_dev;
1247 struct net *net = dev_net(dev);
1248 unsigned int flags;
1249
1250 if (event == NETDEV_UNREGISTER) {
1251 fib_disable_ip(dev, event, true);
1252 rt_flush_dev(dev);
1253 return NOTIFY_DONE;
1254 }
1255
1256 in_dev = __in_dev_get_rtnl(dev);
1257 if (!in_dev)
1258 return NOTIFY_DONE;
1259
1260 switch (event) {
1261 case NETDEV_UP:
1262 for_ifa(in_dev) {
1263 fib_add_ifaddr(ifa);
1264 } endfor_ifa(in_dev);
1265 #ifdef CONFIG_IP_ROUTE_MULTIPATH
1266 fib_sync_up(dev, RTNH_F_DEAD);
1267 #endif
1268 atomic_inc(&net->ipv4.dev_addr_genid);
1269 rt_cache_flush(net);
1270 break;
1271 case NETDEV_DOWN:
1272 fib_disable_ip(dev, event, false);
1273 break;
1274 case NETDEV_CHANGE:
1275 flags = dev_get_flags(dev);
1276 if (flags & (IFF_RUNNING | IFF_LOWER_UP))
1277 fib_sync_up(dev, RTNH_F_LINKDOWN);
1278 else
1279 fib_sync_down_dev(dev, event, false);
1280 /* fall through */
1281 case NETDEV_CHANGEMTU:
1282 rt_cache_flush(net);
1283 break;
1284 case NETDEV_CHANGEUPPER:
1285 info = ptr;
1286 /* flush all routes if dev is linked to or unlinked from
1287 * an L3 master device (e.g., VRF)
1288 */
1289 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
1290 fib_disable_ip(dev, NETDEV_DOWN, true);
1291 break;
1292 }
1293 return NOTIFY_DONE;
1294 }
1295
1296 static struct notifier_block fib_inetaddr_notifier = {
1297 .notifier_call = fib_inetaddr_event,
1298 };
1299
1300 static struct notifier_block fib_netdev_notifier = {
1301 .notifier_call = fib_netdev_event,
1302 };
1303
1304 static int __net_init ip_fib_net_init(struct net *net)
1305 {
1306 int err;
1307 size_t size = sizeof(struct hlist_head) * FIB_TABLE_HASHSZ;
1308
1309 err = fib4_notifier_init(net);
1310 if (err)
1311 return err;
1312
1313 /* Avoid false sharing : Use at least a full cache line */
1314 size = max_t(size_t, size, L1_CACHE_BYTES);
1315
1316 net->ipv4.fib_table_hash = kzalloc(size, GFP_KERNEL);
1317 if (!net->ipv4.fib_table_hash) {
1318 err = -ENOMEM;
1319 goto err_table_hash_alloc;
1320 }
1321
1322 err = fib4_rules_init(net);
1323 if (err < 0)
1324 goto err_rules_init;
1325 return 0;
1326
1327 err_rules_init:
1328 kfree(net->ipv4.fib_table_hash);
1329 err_table_hash_alloc:
1330 fib4_notifier_exit(net);
1331 return err;
1332 }
1333
1334 static void ip_fib_net_exit(struct net *net)
1335 {
1336 int i;
1337
1338 rtnl_lock();
1339 #ifdef CONFIG_IP_MULTIPLE_TABLES
1340 RCU_INIT_POINTER(net->ipv4.fib_main, NULL);
1341 RCU_INIT_POINTER(net->ipv4.fib_default, NULL);
1342 #endif
1343 /* Destroy the tables in reverse order to guarantee that the
1344 * local table, ID 255, is destroyed before the main table, ID
1345 * 254. This is necessary as the local table may contain
1346 * references to data contained in the main table.
1347 */
1348 for (i = FIB_TABLE_HASHSZ - 1; i >= 0; i--) {
1349 struct hlist_head *head = &net->ipv4.fib_table_hash[i];
1350 struct hlist_node *tmp;
1351 struct fib_table *tb;
1352
1353 hlist_for_each_entry_safe(tb, tmp, head, tb_hlist) {
1354 hlist_del(&tb->tb_hlist);
1355 fib_table_flush(net, tb);
1356 fib_free_table(tb);
1357 }
1358 }
1359
1360 #ifdef CONFIG_IP_MULTIPLE_TABLES
1361 fib4_rules_exit(net);
1362 #endif
1363 rtnl_unlock();
1364 kfree(net->ipv4.fib_table_hash);
1365 fib4_notifier_exit(net);
1366 }
1367
1368 static int __net_init fib_net_init(struct net *net)
1369 {
1370 int error;
1371
1372 #ifdef CONFIG_IP_ROUTE_CLASSID
1373 net->ipv4.fib_num_tclassid_users = 0;
1374 #endif
1375 error = ip_fib_net_init(net);
1376 if (error < 0)
1377 goto out;
1378 error = nl_fib_lookup_init(net);
1379 if (error < 0)
1380 goto out_nlfl;
1381 error = fib_proc_init(net);
1382 if (error < 0)
1383 goto out_proc;
1384 out:
1385 return error;
1386
1387 out_proc:
1388 nl_fib_lookup_exit(net);
1389 out_nlfl:
1390 ip_fib_net_exit(net);
1391 goto out;
1392 }
1393
1394 static void __net_exit fib_net_exit(struct net *net)
1395 {
1396 fib_proc_exit(net);
1397 nl_fib_lookup_exit(net);
1398 ip_fib_net_exit(net);
1399 }
1400
1401 static struct pernet_operations fib_net_ops = {
1402 .init = fib_net_init,
1403 .exit = fib_net_exit,
1404 };
1405
1406 void __init ip_fib_init(void)
1407 {
1408 fib_trie_init();
1409
1410 register_pernet_subsys(&fib_net_ops);
1411
1412 register_netdevice_notifier(&fib_netdev_notifier);
1413 register_inetaddr_notifier(&fib_inetaddr_notifier);
1414
1415 rtnl_register(PF_INET, RTM_NEWROUTE, inet_rtm_newroute, NULL, 0);
1416 rtnl_register(PF_INET, RTM_DELROUTE, inet_rtm_delroute, NULL, 0);
1417 rtnl_register(PF_INET, RTM_GETROUTE, NULL, inet_dump_fib, 0);
1418 }
(deprecated) Btrfs devel tree