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Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
[karo-tx-linux.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 #else
77
78 struct fib_table *fib_new_table(struct net *net, u32 id)
79 {
80         struct fib_table *tb, *alias = NULL;
81         unsigned int h;
82
83         if (id == 0)
84                 id = RT_TABLE_MAIN;
85         tb = fib_get_table(net, id);
86         if (tb)
87                 return tb;
88
89         if (id == RT_TABLE_LOCAL && !net->ipv4.fib_has_custom_rules)
90                 alias = fib_new_table(net, RT_TABLE_MAIN);
91
92         tb = fib_trie_table(id, alias);
93         if (!tb)
94                 return NULL;
95
96         switch (id) {
97         case RT_TABLE_MAIN:
98                 rcu_assign_pointer(net->ipv4.fib_main, tb);
99                 break;
100         case RT_TABLE_DEFAULT:
101                 rcu_assign_pointer(net->ipv4.fib_default, tb);
102                 break;
103         default:
104                 break;
105         }
106
107         h = id & (FIB_TABLE_HASHSZ - 1);
108         hlist_add_head_rcu(&tb->tb_hlist, &net->ipv4.fib_table_hash[h]);
109         return tb;
110 }
111 EXPORT_SYMBOL_GPL(fib_new_table);
112
113 /* caller must hold either rtnl or rcu read lock */
114 struct fib_table *fib_get_table(struct net *net, u32 id)
115 {
116         struct fib_table *tb;
117         struct hlist_head *head;
118         unsigned int h;
119
120         if (id == 0)
121                 id = RT_TABLE_MAIN;
122         h = id & (FIB_TABLE_HASHSZ - 1);
123
124         head = &net->ipv4.fib_table_hash[h];
125         hlist_for_each_entry_rcu(tb, head, tb_hlist) {
126                 if (tb->tb_id == id)
127                         return tb;
128         }
129         return NULL;
130 }
131 #endif /* CONFIG_IP_MULTIPLE_TABLES */
132
133 static void fib_replace_table(struct net *net, struct fib_table *old,
134                               struct fib_table *new)
135 {
136 #ifdef CONFIG_IP_MULTIPLE_TABLES
137         switch (new->tb_id) {
138         case RT_TABLE_MAIN:
139                 rcu_assign_pointer(net->ipv4.fib_main, new);
140                 break;
141         case RT_TABLE_DEFAULT:
142                 rcu_assign_pointer(net->ipv4.fib_default, new);
143                 break;
144         default:
145                 break;
146         }
147
148 #endif
149         /* replace the old table in the hlist */
150         hlist_replace_rcu(&old->tb_hlist, &new->tb_hlist);
151 }
152
153 int fib_unmerge(struct net *net)
154 {
155         struct fib_table *old, *new, *main_table;
156
157         /* attempt to fetch local table if it has been allocated */
158         old = fib_get_table(net, RT_TABLE_LOCAL);
159         if (!old)
160                 return 0;
161
162         new = fib_trie_unmerge(old);
163         if (!new)
164                 return -ENOMEM;
165
166         /* table is already unmerged */
167         if (new == old)
168                 return 0;
169
170         /* replace merged table with clean table */
171         fib_replace_table(net, old, new);
172         fib_free_table(old);
173
174         /* attempt to fetch main table if it has been allocated */
175         main_table = fib_get_table(net, RT_TABLE_MAIN);
176         if (!main_table)
177                 return 0;
178
179         /* flush local entries from main table */
180         fib_table_flush_external(main_table);
181
182         return 0;
183 }
184
185 static void fib_flush(struct net *net)
186 {
187         int flushed = 0;
188         unsigned int h;
189
190         for (h = 0; h < FIB_TABLE_HASHSZ; h++) {
191                 struct hlist_head *head = &net->ipv4.fib_table_hash[h];
192                 struct hlist_node *tmp;
193                 struct fib_table *tb;
194
195                 hlist_for_each_entry_safe(tb, tmp, head, tb_hlist)
196                         flushed += fib_table_flush(net, tb);
197         }
198
199         if (flushed)
200                 rt_cache_flush(net);
201 }
202
203 /*
204  * Find address type as if only "dev" was present in the system. If
205  * on_dev is NULL then all interfaces are taken into consideration.
206  */
207 static inline unsigned int __inet_dev_addr_type(struct net *net,
208                                                 const struct net_device *dev,
209                                                 __be32 addr, u32 tb_id)
210 {
211         struct flowi4           fl4 = { .daddr = addr };
212         struct fib_result       res;
213         unsigned int ret = RTN_BROADCAST;
214         struct fib_table *table;
215
216         if (ipv4_is_zeronet(addr) || ipv4_is_lbcast(addr))
217                 return RTN_BROADCAST;
218         if (ipv4_is_multicast(addr))
219                 return RTN_MULTICAST;
220
221         rcu_read_lock();
222
223         table = fib_get_table(net, tb_id);
224         if (table) {
225                 ret = RTN_UNICAST;
226                 if (!fib_table_lookup(table, &fl4, &res, FIB_LOOKUP_NOREF)) {
227                         if (!dev || dev == res.fi->fib_dev)
228                                 ret = res.type;
229                 }
230         }
231
232         rcu_read_unlock();
233         return ret;
234 }
235
236 unsigned int inet_addr_type_table(struct net *net, __be32 addr, u32 tb_id)
237 {
238         return __inet_dev_addr_type(net, NULL, addr, tb_id);
239 }
240 EXPORT_SYMBOL(inet_addr_type_table);
241
242 unsigned int inet_addr_type(struct net *net, __be32 addr)
243 {
244         return __inet_dev_addr_type(net, NULL, addr, RT_TABLE_LOCAL);
245 }
246 EXPORT_SYMBOL(inet_addr_type);
247
248 unsigned int inet_dev_addr_type(struct net *net, const struct net_device *dev,
249                                 __be32 addr)
250 {
251         u32 rt_table = l3mdev_fib_table(dev) ? : RT_TABLE_LOCAL;
252
253         return __inet_dev_addr_type(net, dev, addr, rt_table);
254 }
255 EXPORT_SYMBOL(inet_dev_addr_type);
256
257 /* inet_addr_type with dev == NULL but using the table from a dev
258  * if one is associated
259  */
260 unsigned int inet_addr_type_dev_table(struct net *net,
261                                       const struct net_device *dev,
262                                       __be32 addr)
263 {
264         u32 rt_table = l3mdev_fib_table(dev) ? : RT_TABLE_LOCAL;
265
266         return __inet_dev_addr_type(net, NULL, addr, rt_table);
267 }
268 EXPORT_SYMBOL(inet_addr_type_dev_table);
269
270 __be32 fib_compute_spec_dst(struct sk_buff *skb)
271 {
272         struct net_device *dev = skb->dev;
273         struct in_device *in_dev;
274         struct fib_result res;
275         struct rtable *rt;
276         struct net *net;
277         int scope;
278
279         rt = skb_rtable(skb);
280         if ((rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST | RTCF_LOCAL)) ==
281             RTCF_LOCAL)
282                 return ip_hdr(skb)->daddr;
283
284         in_dev = __in_dev_get_rcu(dev);
285         BUG_ON(!in_dev);
286
287         net = dev_net(dev);
288
289         scope = RT_SCOPE_UNIVERSE;
290         if (!ipv4_is_zeronet(ip_hdr(skb)->saddr)) {
291                 struct flowi4 fl4 = {
292                         .flowi4_iif = LOOPBACK_IFINDEX,
293                         .daddr = ip_hdr(skb)->saddr,
294                         .flowi4_tos = RT_TOS(ip_hdr(skb)->tos),
295                         .flowi4_scope = scope,
296                         .flowi4_mark = IN_DEV_SRC_VMARK(in_dev) ? skb->mark : 0,
297                 };
298                 if (!fib_lookup(net, &fl4, &res, 0))
299                         return FIB_RES_PREFSRC(net, res);
300         } else {
301                 scope = RT_SCOPE_LINK;
302         }
303
304         return inet_select_addr(dev, ip_hdr(skb)->saddr, scope);
305 }
306
307 /* Given (packet source, input interface) and optional (dst, oif, tos):
308  * - (main) check, that source is valid i.e. not broadcast or our local
309  *   address.
310  * - figure out what "logical" interface this packet arrived
311  *   and calculate "specific destination" address.
312  * - check, that packet arrived from expected physical interface.
313  * called with rcu_read_lock()
314  */
315 static int __fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst,
316                                  u8 tos, int oif, struct net_device *dev,
317                                  int rpf, struct in_device *idev, u32 *itag)
318 {
319         int ret, no_addr;
320         struct fib_result res;
321         struct flowi4 fl4;
322         struct net *net = dev_net(dev);
323         bool dev_match;
324
325         fl4.flowi4_oif = 0;
326         fl4.flowi4_iif = l3mdev_master_ifindex_rcu(dev);
327         if (!fl4.flowi4_iif)
328                 fl4.flowi4_iif = oif ? : LOOPBACK_IFINDEX;
329         fl4.daddr = src;
330         fl4.saddr = dst;
331         fl4.flowi4_tos = tos;
332         fl4.flowi4_scope = RT_SCOPE_UNIVERSE;
333         fl4.flowi4_tun_key.tun_id = 0;
334         fl4.flowi4_flags = 0;
335         fl4.flowi4_uid = sock_net_uid(net, NULL);
336
337         no_addr = idev->ifa_list == NULL;
338
339         fl4.flowi4_mark = IN_DEV_SRC_VMARK(idev) ? skb->mark : 0;
340
341         trace_fib_validate_source(dev, &fl4);
342
343         if (fib_lookup(net, &fl4, &res, 0))
344                 goto last_resort;
345         if (res.type != RTN_UNICAST &&
346             (res.type != RTN_LOCAL || !IN_DEV_ACCEPT_LOCAL(idev)))
347                 goto e_inval;
348         if (!rpf && !fib_num_tclassid_users(net) &&
349             (dev->ifindex != oif || !IN_DEV_TX_REDIRECTS(idev)))
350                 goto last_resort;
351         fib_combine_itag(itag, &res);
352         dev_match = false;
353
354 #ifdef CONFIG_IP_ROUTE_MULTIPATH
355         for (ret = 0; ret < res.fi->fib_nhs; ret++) {
356                 struct fib_nh *nh = &res.fi->fib_nh[ret];
357
358                 if (nh->nh_dev == dev) {
359                         dev_match = true;
360                         break;
361                 } else if (l3mdev_master_ifindex_rcu(nh->nh_dev) == dev->ifindex) {
362                         dev_match = true;
363                         break;
364                 }
365         }
366 #else
367         if (FIB_RES_DEV(res) == dev)
368                 dev_match = true;
369 #endif
370         if (dev_match) {
371                 ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST;
372                 return ret;
373         }
374         if (no_addr)
375                 goto last_resort;
376         if (rpf == 1)
377                 goto e_rpf;
378         fl4.flowi4_oif = dev->ifindex;
379
380         ret = 0;
381         if (fib_lookup(net, &fl4, &res, FIB_LOOKUP_IGNORE_LINKSTATE) == 0) {
382                 if (res.type == RTN_UNICAST)
383                         ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST;
384         }
385         return ret;
386
387 last_resort:
388         if (rpf)
389                 goto e_rpf;
390         *itag = 0;
391         return 0;
392
393 e_inval:
394         return -EINVAL;
395 e_rpf:
396         return -EXDEV;
397 }
398
399 /* Ignore rp_filter for packets protected by IPsec. */
400 int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst,
401                         u8 tos, int oif, struct net_device *dev,
402                         struct in_device *idev, u32 *itag)
403 {
404         int r = secpath_exists(skb) ? 0 : IN_DEV_RPFILTER(idev);
405
406         if (!r && !fib_num_tclassid_users(dev_net(dev)) &&
407             IN_DEV_ACCEPT_LOCAL(idev) &&
408             (dev->ifindex != oif || !IN_DEV_TX_REDIRECTS(idev))) {
409                 *itag = 0;
410                 return 0;
411         }
412         return __fib_validate_source(skb, src, dst, tos, oif, dev, r, idev, itag);
413 }
414
415 static inline __be32 sk_extract_addr(struct sockaddr *addr)
416 {
417         return ((struct sockaddr_in *) addr)->sin_addr.s_addr;
418 }
419
420 static int put_rtax(struct nlattr *mx, int len, int type, u32 value)
421 {
422         struct nlattr *nla;
423
424         nla = (struct nlattr *) ((char *) mx + len);
425         nla->nla_type = type;
426         nla->nla_len = nla_attr_size(4);
427         *(u32 *) nla_data(nla) = value;
428
429         return len + nla_total_size(4);
430 }
431
432 static int rtentry_to_fib_config(struct net *net, int cmd, struct rtentry *rt,
433                                  struct fib_config *cfg)
434 {
435         __be32 addr;
436         int plen;
437
438         memset(cfg, 0, sizeof(*cfg));
439         cfg->fc_nlinfo.nl_net = net;
440
441         if (rt->rt_dst.sa_family != AF_INET)
442                 return -EAFNOSUPPORT;
443
444         /*
445          * Check mask for validity:
446          * a) it must be contiguous.
447          * b) destination must have all host bits clear.
448          * c) if application forgot to set correct family (AF_INET),
449          *    reject request unless it is absolutely clear i.e.
450          *    both family and mask are zero.
451          */
452         plen = 32;
453         addr = sk_extract_addr(&rt->rt_dst);
454         if (!(rt->rt_flags & RTF_HOST)) {
455                 __be32 mask = sk_extract_addr(&rt->rt_genmask);
456
457                 if (rt->rt_genmask.sa_family != AF_INET) {
458                         if (mask || rt->rt_genmask.sa_family)
459                                 return -EAFNOSUPPORT;
460                 }
461
462                 if (bad_mask(mask, addr))
463                         return -EINVAL;
464
465                 plen = inet_mask_len(mask);
466         }
467
468         cfg->fc_dst_len = plen;
469         cfg->fc_dst = addr;
470
471         if (cmd != SIOCDELRT) {
472                 cfg->fc_nlflags = NLM_F_CREATE;
473                 cfg->fc_protocol = RTPROT_BOOT;
474         }
475
476         if (rt->rt_metric)
477                 cfg->fc_priority = rt->rt_metric - 1;
478
479         if (rt->rt_flags & RTF_REJECT) {
480                 cfg->fc_scope = RT_SCOPE_HOST;
481                 cfg->fc_type = RTN_UNREACHABLE;
482                 return 0;
483         }
484
485         cfg->fc_scope = RT_SCOPE_NOWHERE;
486         cfg->fc_type = RTN_UNICAST;
487
488         if (rt->rt_dev) {
489                 char *colon;
490                 struct net_device *dev;
491                 char devname[IFNAMSIZ];
492
493                 if (copy_from_user(devname, rt->rt_dev, IFNAMSIZ-1))
494                         return -EFAULT;
495
496                 devname[IFNAMSIZ-1] = 0;
497                 colon = strchr(devname, ':');
498                 if (colon)
499                         *colon = 0;
500                 dev = __dev_get_by_name(net, devname);
501                 if (!dev)
502                         return -ENODEV;
503                 cfg->fc_oif = dev->ifindex;
504                 cfg->fc_table = l3mdev_fib_table(dev);
505                 if (colon) {
506                         struct in_ifaddr *ifa;
507                         struct in_device *in_dev = __in_dev_get_rtnl(dev);
508                         if (!in_dev)
509                                 return -ENODEV;
510                         *colon = ':';
511                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next)
512                                 if (strcmp(ifa->ifa_label, devname) == 0)
513                                         break;
514                         if (!ifa)
515                                 return -ENODEV;
516                         cfg->fc_prefsrc = ifa->ifa_local;
517                 }
518         }
519
520         addr = sk_extract_addr(&rt->rt_gateway);
521         if (rt->rt_gateway.sa_family == AF_INET && addr) {
522                 unsigned int addr_type;
523
524                 cfg->fc_gw = addr;
525                 addr_type = inet_addr_type_table(net, addr, cfg->fc_table);
526                 if (rt->rt_flags & RTF_GATEWAY &&
527                     addr_type == RTN_UNICAST)
528                         cfg->fc_scope = RT_SCOPE_UNIVERSE;
529         }
530
531         if (cmd == SIOCDELRT)
532                 return 0;
533
534         if (rt->rt_flags & RTF_GATEWAY && !cfg->fc_gw)
535                 return -EINVAL;
536
537         if (cfg->fc_scope == RT_SCOPE_NOWHERE)
538                 cfg->fc_scope = RT_SCOPE_LINK;
539
540         if (rt->rt_flags & (RTF_MTU | RTF_WINDOW | RTF_IRTT)) {
541                 struct nlattr *mx;
542                 int len = 0;
543
544                 mx = kzalloc(3 * nla_total_size(4), GFP_KERNEL);
545                 if (!mx)
546                         return -ENOMEM;
547
548                 if (rt->rt_flags & RTF_MTU)
549                         len = put_rtax(mx, len, RTAX_ADVMSS, rt->rt_mtu - 40);
550
551                 if (rt->rt_flags & RTF_WINDOW)
552                         len = put_rtax(mx, len, RTAX_WINDOW, rt->rt_window);
553
554                 if (rt->rt_flags & RTF_IRTT)
555                         len = put_rtax(mx, len, RTAX_RTT, rt->rt_irtt << 3);
556
557                 cfg->fc_mx = mx;
558                 cfg->fc_mx_len = len;
559         }
560
561         return 0;
562 }
563
564 /*
565  * Handle IP routing ioctl calls.
566  * These are used to manipulate the routing tables
567  */
568 int ip_rt_ioctl(struct net *net, unsigned int cmd, void __user *arg)
569 {
570         struct fib_config cfg;
571         struct rtentry rt;
572         int err;
573
574         switch (cmd) {
575         case SIOCADDRT:         /* Add a route */
576         case SIOCDELRT:         /* Delete a route */
577                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
578                         return -EPERM;
579
580                 if (copy_from_user(&rt, arg, sizeof(rt)))
581                         return -EFAULT;
582
583                 rtnl_lock();
584                 err = rtentry_to_fib_config(net, cmd, &rt, &cfg);
585                 if (err == 0) {
586                         struct fib_table *tb;
587
588                         if (cmd == SIOCDELRT) {
589                                 tb = fib_get_table(net, cfg.fc_table);
590                                 if (tb)
591                                         err = fib_table_delete(net, tb, &cfg);
592                                 else
593                                         err = -ESRCH;
594                         } else {
595                                 tb = fib_new_table(net, cfg.fc_table);
596                                 if (tb)
597                                         err = fib_table_insert(net, tb, &cfg);
598                                 else
599                                         err = -ENOBUFS;
600                         }
601
602                         /* allocated by rtentry_to_fib_config() */
603                         kfree(cfg.fc_mx);
604                 }
605                 rtnl_unlock();
606                 return err;
607         }
608         return -EINVAL;
609 }
610
611 const struct nla_policy rtm_ipv4_policy[RTA_MAX + 1] = {
612         [RTA_DST]               = { .type = NLA_U32 },
613         [RTA_SRC]               = { .type = NLA_U32 },
614         [RTA_IIF]               = { .type = NLA_U32 },
615         [RTA_OIF]               = { .type = NLA_U32 },
616         [RTA_GATEWAY]           = { .type = NLA_U32 },
617         [RTA_PRIORITY]          = { .type = NLA_U32 },
618         [RTA_PREFSRC]           = { .type = NLA_U32 },
619         [RTA_METRICS]           = { .type = NLA_NESTED },
620         [RTA_MULTIPATH]         = { .len = sizeof(struct rtnexthop) },
621         [RTA_FLOW]              = { .type = NLA_U32 },
622         [RTA_ENCAP_TYPE]        = { .type = NLA_U16 },
623         [RTA_ENCAP]             = { .type = NLA_NESTED },
624         [RTA_UID]               = { .type = NLA_U32 },
625         [RTA_MARK]              = { .type = NLA_U32 },
626 };
627
628 static int rtm_to_fib_config(struct net *net, struct sk_buff *skb,
629                              struct nlmsghdr *nlh, struct fib_config *cfg)
630 {
631         struct nlattr *attr;
632         int err, remaining;
633         struct rtmsg *rtm;
634
635         err = nlmsg_validate(nlh, sizeof(*rtm), RTA_MAX, rtm_ipv4_policy,
636                              NULL);
637         if (err < 0)
638                 goto errout;
639
640         memset(cfg, 0, sizeof(*cfg));
641
642         rtm = nlmsg_data(nlh);
643         cfg->fc_dst_len = rtm->rtm_dst_len;
644         cfg->fc_tos = rtm->rtm_tos;
645         cfg->fc_table = rtm->rtm_table;
646         cfg->fc_protocol = rtm->rtm_protocol;
647         cfg->fc_scope = rtm->rtm_scope;
648         cfg->fc_type = rtm->rtm_type;
649         cfg->fc_flags = rtm->rtm_flags;
650         cfg->fc_nlflags = nlh->nlmsg_flags;
651
652         cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid;
653         cfg->fc_nlinfo.nlh = nlh;
654         cfg->fc_nlinfo.nl_net = net;
655
656         if (cfg->fc_type > RTN_MAX) {
657                 err = -EINVAL;
658                 goto errout;
659         }
660
661         nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), remaining) {
662                 switch (nla_type(attr)) {
663                 case RTA_DST:
664                         cfg->fc_dst = nla_get_be32(attr);
665                         break;
666                 case RTA_OIF:
667                         cfg->fc_oif = nla_get_u32(attr);
668                         break;
669                 case RTA_GATEWAY:
670                         cfg->fc_gw = nla_get_be32(attr);
671                         break;
672                 case RTA_PRIORITY:
673                         cfg->fc_priority = nla_get_u32(attr);
674                         break;
675                 case RTA_PREFSRC:
676                         cfg->fc_prefsrc = nla_get_be32(attr);
677                         break;
678                 case RTA_METRICS:
679                         cfg->fc_mx = nla_data(attr);
680                         cfg->fc_mx_len = nla_len(attr);
681                         break;
682                 case RTA_MULTIPATH:
683                         err = lwtunnel_valid_encap_type_attr(nla_data(attr),
684                                                              nla_len(attr));
685                         if (err < 0)
686                                 goto errout;
687                         cfg->fc_mp = nla_data(attr);
688                         cfg->fc_mp_len = nla_len(attr);
689                         break;
690                 case RTA_FLOW:
691                         cfg->fc_flow = nla_get_u32(attr);
692                         break;
693                 case RTA_TABLE:
694                         cfg->fc_table = nla_get_u32(attr);
695                         break;
696                 case RTA_ENCAP:
697                         cfg->fc_encap = attr;
698                         break;
699                 case RTA_ENCAP_TYPE:
700                         cfg->fc_encap_type = nla_get_u16(attr);
701                         err = lwtunnel_valid_encap_type(cfg->fc_encap_type);
702                         if (err < 0)
703                                 goto errout;
704                         break;
705                 }
706         }
707
708         return 0;
709 errout:
710         return err;
711 }
712
713 static int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh,
714                              struct netlink_ext_ack *extack)
715 {
716         struct net *net = sock_net(skb->sk);
717         struct fib_config cfg;
718         struct fib_table *tb;
719         int err;
720
721         err = rtm_to_fib_config(net, skb, nlh, &cfg);
722         if (err < 0)
723                 goto errout;
724
725         tb = fib_get_table(net, cfg.fc_table);
726         if (!tb) {
727                 err = -ESRCH;
728                 goto errout;
729         }
730
731         err = fib_table_delete(net, tb, &cfg);
732 errout:
733         return err;
734 }
735
736 static int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh,
737                              struct netlink_ext_ack *extack)
738 {
739         struct net *net = sock_net(skb->sk);
740         struct fib_config cfg;
741         struct fib_table *tb;
742         int err;
743
744         err = rtm_to_fib_config(net, skb, nlh, &cfg);
745         if (err < 0)
746                 goto errout;
747
748         tb = fib_new_table(net, cfg.fc_table);
749         if (!tb) {
750                 err = -ENOBUFS;
751                 goto errout;
752         }
753
754         err = fib_table_insert(net, tb, &cfg);
755 errout:
756         return err;
757 }
758
759 static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb)
760 {
761         struct net *net = sock_net(skb->sk);
762         unsigned int h, s_h;
763         unsigned int e = 0, s_e;
764         struct fib_table *tb;
765         struct hlist_head *head;
766         int dumped = 0, err;
767
768         if (nlmsg_len(cb->nlh) >= sizeof(struct rtmsg) &&
769             ((struct rtmsg *) nlmsg_data(cb->nlh))->rtm_flags & RTM_F_CLONED)
770                 return skb->len;
771
772         s_h = cb->args[0];
773         s_e = cb->args[1];
774
775         rcu_read_lock();
776
777         for (h = s_h; h < FIB_TABLE_HASHSZ; h++, s_e = 0) {
778                 e = 0;
779                 head = &net->ipv4.fib_table_hash[h];
780                 hlist_for_each_entry_rcu(tb, head, tb_hlist) {
781                         if (e < s_e)
782                                 goto next;
783                         if (dumped)
784                                 memset(&cb->args[2], 0, sizeof(cb->args) -
785                                                  2 * sizeof(cb->args[0]));
786                         err = fib_table_dump(tb, skb, cb);
787                         if (err < 0) {
788                                 if (likely(skb->len))
789                                         goto out;
790
791                                 goto out_err;
792                         }
793                         dumped = 1;
794 next:
795                         e++;
796                 }
797         }
798 out:
799         err = skb->len;
800 out_err:
801         rcu_read_unlock();
802
803         cb->args[1] = e;
804         cb->args[0] = h;
805
806         return err;
807 }
808
809 /* Prepare and feed intra-kernel routing request.
810  * Really, it should be netlink message, but :-( netlink
811  * can be not configured, so that we feed it directly
812  * to fib engine. It is legal, because all events occur
813  * only when netlink is already locked.
814  */
815 static void fib_magic(int cmd, int type, __be32 dst, int dst_len, struct in_ifaddr *ifa)
816 {
817         struct net *net = dev_net(ifa->ifa_dev->dev);
818         u32 tb_id = l3mdev_fib_table(ifa->ifa_dev->dev);
819         struct fib_table *tb;
820         struct fib_config cfg = {
821                 .fc_protocol = RTPROT_KERNEL,
822                 .fc_type = type,
823                 .fc_dst = dst,
824                 .fc_dst_len = dst_len,
825                 .fc_prefsrc = ifa->ifa_local,
826                 .fc_oif = ifa->ifa_dev->dev->ifindex,
827                 .fc_nlflags = NLM_F_CREATE | NLM_F_APPEND,
828                 .fc_nlinfo = {
829                         .nl_net = net,
830                 },
831         };
832
833         if (!tb_id)
834                 tb_id = (type == RTN_UNICAST) ? RT_TABLE_MAIN : RT_TABLE_LOCAL;
835
836         tb = fib_new_table(net, tb_id);
837         if (!tb)
838                 return;
839
840         cfg.fc_table = tb->tb_id;
841
842         if (type != RTN_LOCAL)
843                 cfg.fc_scope = RT_SCOPE_LINK;
844         else
845                 cfg.fc_scope = RT_SCOPE_HOST;
846
847         if (cmd == RTM_NEWROUTE)
848                 fib_table_insert(net, tb, &cfg);
849         else
850                 fib_table_delete(net, tb, &cfg);
851 }
852
853 void fib_add_ifaddr(struct in_ifaddr *ifa)
854 {
855         struct in_device *in_dev = ifa->ifa_dev;
856         struct net_device *dev = in_dev->dev;
857         struct in_ifaddr *prim = ifa;
858         __be32 mask = ifa->ifa_mask;
859         __be32 addr = ifa->ifa_local;
860         __be32 prefix = ifa->ifa_address & mask;
861
862         if (ifa->ifa_flags & IFA_F_SECONDARY) {
863                 prim = inet_ifa_byprefix(in_dev, prefix, mask);
864                 if (!prim) {
865                         pr_warn("%s: bug: prim == NULL\n", __func__);
866                         return;
867                 }
868         }
869
870         fib_magic(RTM_NEWROUTE, RTN_LOCAL, addr, 32, prim);
871
872         if (!(dev->flags & IFF_UP))
873                 return;
874
875         /* Add broadcast address, if it is explicitly assigned. */
876         if (ifa->ifa_broadcast && ifa->ifa_broadcast != htonl(0xFFFFFFFF))
877                 fib_magic(RTM_NEWROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim);
878
879         if (!ipv4_is_zeronet(prefix) && !(ifa->ifa_flags & IFA_F_SECONDARY) &&
880             (prefix != addr || ifa->ifa_prefixlen < 32)) {
881                 if (!(ifa->ifa_flags & IFA_F_NOPREFIXROUTE))
882                         fib_magic(RTM_NEWROUTE,
883                                   dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST,
884                                   prefix, ifa->ifa_prefixlen, prim);
885
886                 /* Add network specific broadcasts, when it takes a sense */
887                 if (ifa->ifa_prefixlen < 31) {
888                         fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix, 32, prim);
889                         fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix | ~mask,
890                                   32, prim);
891                 }
892         }
893 }
894
895 /* Delete primary or secondary address.
896  * Optionally, on secondary address promotion consider the addresses
897  * from subnet iprim as deleted, even if they are in device list.
898  * In this case the secondary ifa can be in device list.
899  */
900 void fib_del_ifaddr(struct in_ifaddr *ifa, struct in_ifaddr *iprim)
901 {
902         struct in_device *in_dev = ifa->ifa_dev;
903         struct net_device *dev = in_dev->dev;
904         struct in_ifaddr *ifa1;
905         struct in_ifaddr *prim = ifa, *prim1 = NULL;
906         __be32 brd = ifa->ifa_address | ~ifa->ifa_mask;
907         __be32 any = ifa->ifa_address & ifa->ifa_mask;
908 #define LOCAL_OK        1
909 #define BRD_OK          2
910 #define BRD0_OK         4
911 #define BRD1_OK         8
912         unsigned int ok = 0;
913         int subnet = 0;         /* Primary network */
914         int gone = 1;           /* Address is missing */
915         int same_prefsrc = 0;   /* Another primary with same IP */
916
917         if (ifa->ifa_flags & IFA_F_SECONDARY) {
918                 prim = inet_ifa_byprefix(in_dev, any, ifa->ifa_mask);
919                 if (!prim) {
920                         /* if the device has been deleted, we don't perform
921                          * address promotion
922                          */
923                         if (!in_dev->dead)
924                                 pr_warn("%s: bug: prim == NULL\n", __func__);
925                         return;
926                 }
927                 if (iprim && iprim != prim) {
928                         pr_warn("%s: bug: iprim != prim\n", __func__);
929                         return;
930                 }
931         } else if (!ipv4_is_zeronet(any) &&
932                    (any != ifa->ifa_local || ifa->ifa_prefixlen < 32)) {
933                 if (!(ifa->ifa_flags & IFA_F_NOPREFIXROUTE))
934                         fib_magic(RTM_DELROUTE,
935                                   dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST,
936                                   any, ifa->ifa_prefixlen, prim);
937                 subnet = 1;
938         }
939
940         if (in_dev->dead)
941                 goto no_promotions;
942
943         /* Deletion is more complicated than add.
944          * We should take care of not to delete too much :-)
945          *
946          * Scan address list to be sure that addresses are really gone.
947          */
948
949         for (ifa1 = in_dev->ifa_list; ifa1; ifa1 = ifa1->ifa_next) {
950                 if (ifa1 == ifa) {
951                         /* promotion, keep the IP */
952                         gone = 0;
953                         continue;
954                 }
955                 /* Ignore IFAs from our subnet */
956                 if (iprim && ifa1->ifa_mask == iprim->ifa_mask &&
957                     inet_ifa_match(ifa1->ifa_address, iprim))
958                         continue;
959
960                 /* Ignore ifa1 if it uses different primary IP (prefsrc) */
961                 if (ifa1->ifa_flags & IFA_F_SECONDARY) {
962                         /* Another address from our subnet? */
963                         if (ifa1->ifa_mask == prim->ifa_mask &&
964                             inet_ifa_match(ifa1->ifa_address, prim))
965                                 prim1 = prim;
966                         else {
967                                 /* We reached the secondaries, so
968                                  * same_prefsrc should be determined.
969                                  */
970                                 if (!same_prefsrc)
971                                         continue;
972                                 /* Search new prim1 if ifa1 is not
973                                  * using the current prim1
974                                  */
975                                 if (!prim1 ||
976                                     ifa1->ifa_mask != prim1->ifa_mask ||
977                                     !inet_ifa_match(ifa1->ifa_address, prim1))
978                                         prim1 = inet_ifa_byprefix(in_dev,
979                                                         ifa1->ifa_address,
980                                                         ifa1->ifa_mask);
981                                 if (!prim1)
982                                         continue;
983                                 if (prim1->ifa_local != prim->ifa_local)
984                                         continue;
985                         }
986                 } else {
987                         if (prim->ifa_local != ifa1->ifa_local)
988                                 continue;
989                         prim1 = ifa1;
990                         if (prim != prim1)
991                                 same_prefsrc = 1;
992                 }
993                 if (ifa->ifa_local == ifa1->ifa_local)
994                         ok |= LOCAL_OK;
995                 if (ifa->ifa_broadcast == ifa1->ifa_broadcast)
996                         ok |= BRD_OK;
997                 if (brd == ifa1->ifa_broadcast)
998                         ok |= BRD1_OK;
999                 if (any == ifa1->ifa_broadcast)
1000                         ok |= BRD0_OK;
1001                 /* primary has network specific broadcasts */
1002                 if (prim1 == ifa1 && ifa1->ifa_prefixlen < 31) {
1003                         __be32 brd1 = ifa1->ifa_address | ~ifa1->ifa_mask;
1004                         __be32 any1 = ifa1->ifa_address & ifa1->ifa_mask;
1005
1006                         if (!ipv4_is_zeronet(any1)) {
1007                                 if (ifa->ifa_broadcast == brd1 ||
1008                                     ifa->ifa_broadcast == any1)
1009                                         ok |= BRD_OK;
1010                                 if (brd == brd1 || brd == any1)
1011                                         ok |= BRD1_OK;
1012                                 if (any == brd1 || any == any1)
1013                                         ok |= BRD0_OK;
1014                         }
1015                 }
1016         }
1017
1018 no_promotions:
1019         if (!(ok & BRD_OK))
1020                 fib_magic(RTM_DELROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim);
1021         if (subnet && ifa->ifa_prefixlen < 31) {
1022                 if (!(ok & BRD1_OK))
1023                         fib_magic(RTM_DELROUTE, RTN_BROADCAST, brd, 32, prim);
1024                 if (!(ok & BRD0_OK))
1025                         fib_magic(RTM_DELROUTE, RTN_BROADCAST, any, 32, prim);
1026         }
1027         if (!(ok & LOCAL_OK)) {
1028                 unsigned int addr_type;
1029
1030                 fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 32, prim);
1031
1032                 /* Check, that this local address finally disappeared. */
1033                 addr_type = inet_addr_type_dev_table(dev_net(dev), dev,
1034                                                      ifa->ifa_local);
1035                 if (gone && addr_type != RTN_LOCAL) {
1036                         /* And the last, but not the least thing.
1037                          * We must flush stray FIB entries.
1038                          *
1039                          * First of all, we scan fib_info list searching
1040                          * for stray nexthop entries, then ignite fib_flush.
1041                          */
1042                         if (fib_sync_down_addr(dev, ifa->ifa_local))
1043                                 fib_flush(dev_net(dev));
1044                 }
1045         }
1046 #undef LOCAL_OK
1047 #undef BRD_OK
1048 #undef BRD0_OK
1049 #undef BRD1_OK
1050 }
1051
1052 static void nl_fib_lookup(struct net *net, struct fib_result_nl *frn)
1053 {
1054
1055         struct fib_result       res;
1056         struct flowi4           fl4 = {
1057                 .flowi4_mark = frn->fl_mark,
1058                 .daddr = frn->fl_addr,
1059                 .flowi4_tos = frn->fl_tos,
1060                 .flowi4_scope = frn->fl_scope,
1061         };
1062         struct fib_table *tb;
1063
1064         rcu_read_lock();
1065
1066         tb = fib_get_table(net, frn->tb_id_in);
1067
1068         frn->err = -ENOENT;
1069         if (tb) {
1070                 local_bh_disable();
1071
1072                 frn->tb_id = tb->tb_id;
1073                 frn->err = fib_table_lookup(tb, &fl4, &res, FIB_LOOKUP_NOREF);
1074
1075                 if (!frn->err) {
1076                         frn->prefixlen = res.prefixlen;
1077                         frn->nh_sel = res.nh_sel;
1078                         frn->type = res.type;
1079                         frn->scope = res.scope;
1080                 }
1081                 local_bh_enable();
1082         }
1083
1084         rcu_read_unlock();
1085 }
1086
1087 static void nl_fib_input(struct sk_buff *skb)
1088 {
1089         struct net *net;
1090         struct fib_result_nl *frn;
1091         struct nlmsghdr *nlh;
1092         u32 portid;
1093
1094         net = sock_net(skb->sk);
1095         nlh = nlmsg_hdr(skb);
1096         if (skb->len < nlmsg_total_size(sizeof(*frn)) ||
1097             skb->len < nlh->nlmsg_len ||
1098             nlmsg_len(nlh) < sizeof(*frn))
1099                 return;
1100
1101         skb = netlink_skb_clone(skb, GFP_KERNEL);
1102         if (!skb)
1103                 return;
1104         nlh = nlmsg_hdr(skb);
1105
1106         frn = (struct fib_result_nl *) nlmsg_data(nlh);
1107         nl_fib_lookup(net, frn);
1108
1109         portid = NETLINK_CB(skb).portid;      /* netlink portid */
1110         NETLINK_CB(skb).portid = 0;        /* from kernel */
1111         NETLINK_CB(skb).dst_group = 0;  /* unicast */
1112         netlink_unicast(net->ipv4.fibnl, skb, portid, MSG_DONTWAIT);
1113 }
1114
1115 static int __net_init nl_fib_lookup_init(struct net *net)
1116 {
1117         struct sock *sk;
1118         struct netlink_kernel_cfg cfg = {
1119                 .input  = nl_fib_input,
1120         };
1121
1122         sk = netlink_kernel_create(net, NETLINK_FIB_LOOKUP, &cfg);
1123         if (!sk)
1124                 return -EAFNOSUPPORT;
1125         net->ipv4.fibnl = sk;
1126         return 0;
1127 }
1128
1129 static void nl_fib_lookup_exit(struct net *net)
1130 {
1131         netlink_kernel_release(net->ipv4.fibnl);
1132         net->ipv4.fibnl = NULL;
1133 }
1134
1135 static void fib_disable_ip(struct net_device *dev, unsigned long event,
1136                            bool force)
1137 {
1138         if (fib_sync_down_dev(dev, event, force))
1139                 fib_flush(dev_net(dev));
1140         else
1141                 rt_cache_flush(dev_net(dev));
1142         arp_ifdown(dev);
1143 }
1144
1145 static int fib_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
1146 {
1147         struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
1148         struct net_device *dev = ifa->ifa_dev->dev;
1149         struct net *net = dev_net(dev);
1150
1151         switch (event) {
1152         case NETDEV_UP:
1153                 fib_add_ifaddr(ifa);
1154 #ifdef CONFIG_IP_ROUTE_MULTIPATH
1155                 fib_sync_up(dev, RTNH_F_DEAD);
1156 #endif
1157                 atomic_inc(&net->ipv4.dev_addr_genid);
1158                 rt_cache_flush(dev_net(dev));
1159                 break;
1160         case NETDEV_DOWN:
1161                 fib_del_ifaddr(ifa, NULL);
1162                 atomic_inc(&net->ipv4.dev_addr_genid);
1163                 if (!ifa->ifa_dev->ifa_list) {
1164                         /* Last address was deleted from this interface.
1165                          * Disable IP.
1166                          */
1167                         fib_disable_ip(dev, event, true);
1168                 } else {
1169                         rt_cache_flush(dev_net(dev));
1170                 }
1171                 break;
1172         }
1173         return NOTIFY_DONE;
1174 }
1175
1176 static int fib_netdev_event(struct notifier_block *this, unsigned long event, void *ptr)
1177 {
1178         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1179         struct netdev_notifier_changeupper_info *info;
1180         struct in_device *in_dev;
1181         struct net *net = dev_net(dev);
1182         unsigned int flags;
1183
1184         if (event == NETDEV_UNREGISTER) {
1185                 fib_disable_ip(dev, event, true);
1186                 rt_flush_dev(dev);
1187                 return NOTIFY_DONE;
1188         }
1189
1190         in_dev = __in_dev_get_rtnl(dev);
1191         if (!in_dev)
1192                 return NOTIFY_DONE;
1193
1194         switch (event) {
1195         case NETDEV_UP:
1196                 for_ifa(in_dev) {
1197                         fib_add_ifaddr(ifa);
1198                 } endfor_ifa(in_dev);
1199 #ifdef CONFIG_IP_ROUTE_MULTIPATH
1200                 fib_sync_up(dev, RTNH_F_DEAD);
1201 #endif
1202                 atomic_inc(&net->ipv4.dev_addr_genid);
1203                 rt_cache_flush(net);
1204                 break;
1205         case NETDEV_DOWN:
1206                 fib_disable_ip(dev, event, false);
1207                 break;
1208         case NETDEV_CHANGE:
1209                 flags = dev_get_flags(dev);
1210                 if (flags & (IFF_RUNNING | IFF_LOWER_UP))
1211                         fib_sync_up(dev, RTNH_F_LINKDOWN);
1212                 else
1213                         fib_sync_down_dev(dev, event, false);
1214                 /* fall through */
1215         case NETDEV_CHANGEMTU:
1216                 rt_cache_flush(net);
1217                 break;
1218         case NETDEV_CHANGEUPPER:
1219                 info = ptr;
1220                 /* flush all routes if dev is linked to or unlinked from
1221                  * an L3 master device (e.g., VRF)
1222                  */
1223                 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
1224                         fib_disable_ip(dev, NETDEV_DOWN, true);
1225                 break;
1226         }
1227         return NOTIFY_DONE;
1228 }
1229
1230 static struct notifier_block fib_inetaddr_notifier = {
1231         .notifier_call = fib_inetaddr_event,
1232 };
1233
1234 static struct notifier_block fib_netdev_notifier = {
1235         .notifier_call = fib_netdev_event,
1236 };
1237
1238 static int __net_init ip_fib_net_init(struct net *net)
1239 {
1240         int err;
1241         size_t size = sizeof(struct hlist_head) * FIB_TABLE_HASHSZ;
1242
1243         net->ipv4.fib_seq = 0;
1244
1245         /* Avoid false sharing : Use at least a full cache line */
1246         size = max_t(size_t, size, L1_CACHE_BYTES);
1247
1248         net->ipv4.fib_table_hash = kzalloc(size, GFP_KERNEL);
1249         if (!net->ipv4.fib_table_hash)
1250                 return -ENOMEM;
1251
1252         err = fib4_rules_init(net);
1253         if (err < 0)
1254                 goto fail;
1255         return 0;
1256
1257 fail:
1258         kfree(net->ipv4.fib_table_hash);
1259         return err;
1260 }
1261
1262 static void ip_fib_net_exit(struct net *net)
1263 {
1264         unsigned int i;
1265
1266         rtnl_lock();
1267 #ifdef CONFIG_IP_MULTIPLE_TABLES
1268         RCU_INIT_POINTER(net->ipv4.fib_main, NULL);
1269         RCU_INIT_POINTER(net->ipv4.fib_default, NULL);
1270 #endif
1271         for (i = 0; i < FIB_TABLE_HASHSZ; i++) {
1272                 struct hlist_head *head = &net->ipv4.fib_table_hash[i];
1273                 struct hlist_node *tmp;
1274                 struct fib_table *tb;
1275
1276                 hlist_for_each_entry_safe(tb, tmp, head, tb_hlist) {
1277                         hlist_del(&tb->tb_hlist);
1278                         fib_table_flush(net, tb);
1279                         fib_free_table(tb);
1280                 }
1281         }
1282
1283 #ifdef CONFIG_IP_MULTIPLE_TABLES
1284         fib4_rules_exit(net);
1285 #endif
1286         rtnl_unlock();
1287         kfree(net->ipv4.fib_table_hash);
1288 }
1289
1290 static int __net_init fib_net_init(struct net *net)
1291 {
1292         int error;
1293
1294 #ifdef CONFIG_IP_ROUTE_CLASSID
1295         net->ipv4.fib_num_tclassid_users = 0;
1296 #endif
1297         error = ip_fib_net_init(net);
1298         if (error < 0)
1299                 goto out;
1300         error = nl_fib_lookup_init(net);
1301         if (error < 0)
1302                 goto out_nlfl;
1303         error = fib_proc_init(net);
1304         if (error < 0)
1305                 goto out_proc;
1306 out:
1307         return error;
1308
1309 out_proc:
1310         nl_fib_lookup_exit(net);
1311 out_nlfl:
1312         ip_fib_net_exit(net);
1313         goto out;
1314 }
1315
1316 static void __net_exit fib_net_exit(struct net *net)
1317 {
1318         fib_proc_exit(net);
1319         nl_fib_lookup_exit(net);
1320         ip_fib_net_exit(net);
1321 }
1322
1323 static struct pernet_operations fib_net_ops = {
1324         .init = fib_net_init,
1325         .exit = fib_net_exit,
1326 };
1327
1328 void __init ip_fib_init(void)
1329 {
1330         rtnl_register(PF_INET, RTM_NEWROUTE, inet_rtm_newroute, NULL, NULL);
1331         rtnl_register(PF_INET, RTM_DELROUTE, inet_rtm_delroute, NULL, NULL);
1332         rtnl_register(PF_INET, RTM_GETROUTE, NULL, inet_dump_fib, NULL);
1333
1334         register_pernet_subsys(&fib_net_ops);
1335         register_netdevice_notifier(&fib_netdev_notifier);
1336         register_inetaddr_notifier(&fib_inetaddr_notifier);
1337
1338         fib_trie_init();
1339 }