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net: ipv4: Fix memory leak in network namespace dismantle
[thirdparty/kernel/stable.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, false);
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
286 net = dev_net(dev);
287
288 scope = RT_SCOPE_UNIVERSE;
289 if (!ipv4_is_zeronet(ip_hdr(skb)->saddr)) {
290 bool vmark = in_dev && IN_DEV_SRC_VMARK(in_dev);
291 struct flowi4 fl4 = {
292 .flowi4_iif = LOOPBACK_IFINDEX,
293 .flowi4_oif = l3mdev_master_ifindex_rcu(dev),
294 .daddr = ip_hdr(skb)->saddr,
295 .flowi4_tos = RT_TOS(ip_hdr(skb)->tos),
296 .flowi4_scope = scope,
297 .flowi4_mark = vmark ? skb->mark : 0,
298 };
299 if (!fib_lookup(net, &fl4, &res, 0))
300 return FIB_RES_PREFSRC(net, res);
301 } else {
302 scope = RT_SCOPE_LINK;
303 }
304
305 return inet_select_addr(dev, ip_hdr(skb)->saddr, scope);
306 }
307
308 /* Given (packet source, input interface) and optional (dst, oif, tos):
309 * - (main) check, that source is valid i.e. not broadcast or our local
310 * address.
311 * - figure out what "logical" interface this packet arrived
312 * and calculate "specific destination" address.
313 * - check, that packet arrived from expected physical interface.
314 * called with rcu_read_lock()
315 */
316 static int __fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst,
317 u8 tos, int oif, struct net_device *dev,
318 int rpf, struct in_device *idev, u32 *itag)
319 {
320 int ret, no_addr;
321 struct fib_result res;
322 struct flowi4 fl4;
323 struct net *net = dev_net(dev);
324 bool dev_match;
325
326 fl4.flowi4_oif = 0;
327 fl4.flowi4_iif = l3mdev_master_ifindex_rcu(dev);
328 if (!fl4.flowi4_iif)
329 fl4.flowi4_iif = oif ? : LOOPBACK_IFINDEX;
330 fl4.daddr = src;
331 fl4.saddr = dst;
332 fl4.flowi4_tos = tos;
333 fl4.flowi4_scope = RT_SCOPE_UNIVERSE;
334 fl4.flowi4_tun_key.tun_id = 0;
335 fl4.flowi4_flags = 0;
336 fl4.flowi4_uid = sock_net_uid(net, NULL);
337
338 no_addr = idev->ifa_list == NULL;
339
340 fl4.flowi4_mark = IN_DEV_SRC_VMARK(idev) ? skb->mark : 0;
341
342 trace_fib_validate_source(dev, &fl4);
343
344 if (fib_lookup(net, &fl4, &res, 0))
345 goto last_resort;
346 if (res.type != RTN_UNICAST &&
347 (res.type != RTN_LOCAL || !IN_DEV_ACCEPT_LOCAL(idev)))
348 goto e_inval;
349 if (!rpf && !fib_num_tclassid_users(net) &&
350 (dev->ifindex != oif || !IN_DEV_TX_REDIRECTS(idev)))
351 goto last_resort;
352 fib_combine_itag(itag, &res);
353 dev_match = false;
354
355 #ifdef CONFIG_IP_ROUTE_MULTIPATH
356 for (ret = 0; ret < res.fi->fib_nhs; ret++) {
357 struct fib_nh *nh = &res.fi->fib_nh[ret];
358
359 if (nh->nh_dev == dev) {
360 dev_match = true;
361 break;
362 } else if (l3mdev_master_ifindex_rcu(nh->nh_dev) == dev->ifindex) {
363 dev_match = true;
364 break;
365 }
366 }
367 #else
368 if (FIB_RES_DEV(res) == dev)
369 dev_match = true;
370 #endif
371 if (dev_match) {
372 ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST;
373 return ret;
374 }
375 if (no_addr)
376 goto last_resort;
377 if (rpf == 1)
378 goto e_rpf;
379 fl4.flowi4_oif = dev->ifindex;
380
381 ret = 0;
382 if (fib_lookup(net, &fl4, &res, FIB_LOOKUP_IGNORE_LINKSTATE) == 0) {
383 if (res.type == RTN_UNICAST)
384 ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST;
385 }
386 return ret;
387
388 last_resort:
389 if (rpf)
390 goto e_rpf;
391 *itag = 0;
392 return 0;
393
394 e_inval:
395 return -EINVAL;
396 e_rpf:
397 return -EXDEV;
398 }
399
400 /* Ignore rp_filter for packets protected by IPsec. */
401 int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst,
402 u8 tos, int oif, struct net_device *dev,
403 struct in_device *idev, u32 *itag)
404 {
405 int r = secpath_exists(skb) ? 0 : IN_DEV_RPFILTER(idev);
406
407 if (!r && !fib_num_tclassid_users(dev_net(dev)) &&
408 IN_DEV_ACCEPT_LOCAL(idev) &&
409 (dev->ifindex != oif || !IN_DEV_TX_REDIRECTS(idev))) {
410 *itag = 0;
411 return 0;
412 }
413 return __fib_validate_source(skb, src, dst, tos, oif, dev, r, idev, itag);
414 }
415
416 static inline __be32 sk_extract_addr(struct sockaddr *addr)
417 {
418 return ((struct sockaddr_in *) addr)->sin_addr.s_addr;
419 }
420
421 static int put_rtax(struct nlattr *mx, int len, int type, u32 value)
422 {
423 struct nlattr *nla;
424
425 nla = (struct nlattr *) ((char *) mx + len);
426 nla->nla_type = type;
427 nla->nla_len = nla_attr_size(4);
428 *(u32 *) nla_data(nla) = value;
429
430 return len + nla_total_size(4);
431 }
432
433 static int rtentry_to_fib_config(struct net *net, int cmd, struct rtentry *rt,
434 struct fib_config *cfg)
435 {
436 __be32 addr;
437 int plen;
438
439 memset(cfg, 0, sizeof(*cfg));
440 cfg->fc_nlinfo.nl_net = net;
441
442 if (rt->rt_dst.sa_family != AF_INET)
443 return -EAFNOSUPPORT;
444
445 /*
446 * Check mask for validity:
447 * a) it must be contiguous.
448 * b) destination must have all host bits clear.
449 * c) if application forgot to set correct family (AF_INET),
450 * reject request unless it is absolutely clear i.e.
451 * both family and mask are zero.
452 */
453 plen = 32;
454 addr = sk_extract_addr(&rt->rt_dst);
455 if (!(rt->rt_flags & RTF_HOST)) {
456 __be32 mask = sk_extract_addr(&rt->rt_genmask);
457
458 if (rt->rt_genmask.sa_family != AF_INET) {
459 if (mask || rt->rt_genmask.sa_family)
460 return -EAFNOSUPPORT;
461 }
462
463 if (bad_mask(mask, addr))
464 return -EINVAL;
465
466 plen = inet_mask_len(mask);
467 }
468
469 cfg->fc_dst_len = plen;
470 cfg->fc_dst = addr;
471
472 if (cmd != SIOCDELRT) {
473 cfg->fc_nlflags = NLM_F_CREATE;
474 cfg->fc_protocol = RTPROT_BOOT;
475 }
476
477 if (rt->rt_metric)
478 cfg->fc_priority = rt->rt_metric - 1;
479
480 if (rt->rt_flags & RTF_REJECT) {
481 cfg->fc_scope = RT_SCOPE_HOST;
482 cfg->fc_type = RTN_UNREACHABLE;
483 return 0;
484 }
485
486 cfg->fc_scope = RT_SCOPE_NOWHERE;
487 cfg->fc_type = RTN_UNICAST;
488
489 if (rt->rt_dev) {
490 char *colon;
491 struct net_device *dev;
492 char devname[IFNAMSIZ];
493
494 if (copy_from_user(devname, rt->rt_dev, IFNAMSIZ-1))
495 return -EFAULT;
496
497 devname[IFNAMSIZ-1] = 0;
498 colon = strchr(devname, ':');
499 if (colon)
500 *colon = 0;
501 dev = __dev_get_by_name(net, devname);
502 if (!dev)
503 return -ENODEV;
504 cfg->fc_oif = dev->ifindex;
505 cfg->fc_table = l3mdev_fib_table(dev);
506 if (colon) {
507 struct in_ifaddr *ifa;
508 struct in_device *in_dev = __in_dev_get_rtnl(dev);
509 if (!in_dev)
510 return -ENODEV;
511 *colon = ':';
512 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next)
513 if (strcmp(ifa->ifa_label, devname) == 0)
514 break;
515 if (!ifa)
516 return -ENODEV;
517 cfg->fc_prefsrc = ifa->ifa_local;
518 }
519 }
520
521 addr = sk_extract_addr(&rt->rt_gateway);
522 if (rt->rt_gateway.sa_family == AF_INET && addr) {
523 unsigned int addr_type;
524
525 cfg->fc_gw = addr;
526 addr_type = inet_addr_type_table(net, addr, cfg->fc_table);
527 if (rt->rt_flags & RTF_GATEWAY &&
528 addr_type == RTN_UNICAST)
529 cfg->fc_scope = RT_SCOPE_UNIVERSE;
530 }
531
532 if (cmd == SIOCDELRT)
533 return 0;
534
535 if (rt->rt_flags & RTF_GATEWAY && !cfg->fc_gw)
536 return -EINVAL;
537
538 if (cfg->fc_scope == RT_SCOPE_NOWHERE)
539 cfg->fc_scope = RT_SCOPE_LINK;
540
541 if (rt->rt_flags & (RTF_MTU | RTF_WINDOW | RTF_IRTT)) {
542 struct nlattr *mx;
543 int len = 0;
544
545 mx = kzalloc(3 * nla_total_size(4), GFP_KERNEL);
546 if (!mx)
547 return -ENOMEM;
548
549 if (rt->rt_flags & RTF_MTU)
550 len = put_rtax(mx, len, RTAX_ADVMSS, rt->rt_mtu - 40);
551
552 if (rt->rt_flags & RTF_WINDOW)
553 len = put_rtax(mx, len, RTAX_WINDOW, rt->rt_window);
554
555 if (rt->rt_flags & RTF_IRTT)
556 len = put_rtax(mx, len, RTAX_RTT, rt->rt_irtt << 3);
557
558 cfg->fc_mx = mx;
559 cfg->fc_mx_len = len;
560 }
561
562 return 0;
563 }
564
565 /*
566 * Handle IP routing ioctl calls.
567 * These are used to manipulate the routing tables
568 */
569 int ip_rt_ioctl(struct net *net, unsigned int cmd, void __user *arg)
570 {
571 struct fib_config cfg;
572 struct rtentry rt;
573 int err;
574
575 switch (cmd) {
576 case SIOCADDRT: /* Add a route */
577 case SIOCDELRT: /* Delete a route */
578 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
579 return -EPERM;
580
581 if (copy_from_user(&rt, arg, sizeof(rt)))
582 return -EFAULT;
583
584 rtnl_lock();
585 err = rtentry_to_fib_config(net, cmd, &rt, &cfg);
586 if (err == 0) {
587 struct fib_table *tb;
588
589 if (cmd == SIOCDELRT) {
590 tb = fib_get_table(net, cfg.fc_table);
591 if (tb)
592 err = fib_table_delete(net, tb, &cfg,
593 NULL);
594 else
595 err = -ESRCH;
596 } else {
597 tb = fib_new_table(net, cfg.fc_table);
598 if (tb)
599 err = fib_table_insert(net, tb,
600 &cfg, NULL);
601 else
602 err = -ENOBUFS;
603 }
604
605 /* allocated by rtentry_to_fib_config() */
606 kfree(cfg.fc_mx);
607 }
608 rtnl_unlock();
609 return err;
610 }
611 return -EINVAL;
612 }
613
614 const struct nla_policy rtm_ipv4_policy[RTA_MAX + 1] = {
615 [RTA_DST] = { .type = NLA_U32 },
616 [RTA_SRC] = { .type = NLA_U32 },
617 [RTA_IIF] = { .type = NLA_U32 },
618 [RTA_OIF] = { .type = NLA_U32 },
619 [RTA_GATEWAY] = { .type = NLA_U32 },
620 [RTA_PRIORITY] = { .type = NLA_U32 },
621 [RTA_PREFSRC] = { .type = NLA_U32 },
622 [RTA_METRICS] = { .type = NLA_NESTED },
623 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
624 [RTA_FLOW] = { .type = NLA_U32 },
625 [RTA_ENCAP_TYPE] = { .type = NLA_U16 },
626 [RTA_ENCAP] = { .type = NLA_NESTED },
627 [RTA_UID] = { .type = NLA_U32 },
628 [RTA_MARK] = { .type = NLA_U32 },
629 [RTA_TABLE] = { .type = NLA_U32 },
630 };
631
632 static int rtm_to_fib_config(struct net *net, struct sk_buff *skb,
633 struct nlmsghdr *nlh, struct fib_config *cfg,
634 struct netlink_ext_ack *extack)
635 {
636 struct nlattr *attr;
637 int err, remaining;
638 struct rtmsg *rtm;
639
640 err = nlmsg_validate(nlh, sizeof(*rtm), RTA_MAX, rtm_ipv4_policy,
641 extack);
642 if (err < 0)
643 goto errout;
644
645 memset(cfg, 0, sizeof(*cfg));
646
647 rtm = nlmsg_data(nlh);
648 cfg->fc_dst_len = rtm->rtm_dst_len;
649 cfg->fc_tos = rtm->rtm_tos;
650 cfg->fc_table = rtm->rtm_table;
651 cfg->fc_protocol = rtm->rtm_protocol;
652 cfg->fc_scope = rtm->rtm_scope;
653 cfg->fc_type = rtm->rtm_type;
654 cfg->fc_flags = rtm->rtm_flags;
655 cfg->fc_nlflags = nlh->nlmsg_flags;
656
657 cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid;
658 cfg->fc_nlinfo.nlh = nlh;
659 cfg->fc_nlinfo.nl_net = net;
660
661 if (cfg->fc_type > RTN_MAX) {
662 NL_SET_ERR_MSG(extack, "Invalid route type");
663 err = -EINVAL;
664 goto errout;
665 }
666
667 nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), remaining) {
668 switch (nla_type(attr)) {
669 case RTA_DST:
670 cfg->fc_dst = nla_get_be32(attr);
671 break;
672 case RTA_OIF:
673 cfg->fc_oif = nla_get_u32(attr);
674 break;
675 case RTA_GATEWAY:
676 cfg->fc_gw = nla_get_be32(attr);
677 break;
678 case RTA_PRIORITY:
679 cfg->fc_priority = nla_get_u32(attr);
680 break;
681 case RTA_PREFSRC:
682 cfg->fc_prefsrc = nla_get_be32(attr);
683 break;
684 case RTA_METRICS:
685 cfg->fc_mx = nla_data(attr);
686 cfg->fc_mx_len = nla_len(attr);
687 break;
688 case RTA_MULTIPATH:
689 err = lwtunnel_valid_encap_type_attr(nla_data(attr),
690 nla_len(attr),
691 extack);
692 if (err < 0)
693 goto errout;
694 cfg->fc_mp = nla_data(attr);
695 cfg->fc_mp_len = nla_len(attr);
696 break;
697 case RTA_FLOW:
698 cfg->fc_flow = nla_get_u32(attr);
699 break;
700 case RTA_TABLE:
701 cfg->fc_table = nla_get_u32(attr);
702 break;
703 case RTA_ENCAP:
704 cfg->fc_encap = attr;
705 break;
706 case RTA_ENCAP_TYPE:
707 cfg->fc_encap_type = nla_get_u16(attr);
708 err = lwtunnel_valid_encap_type(cfg->fc_encap_type,
709 extack);
710 if (err < 0)
711 goto errout;
712 break;
713 }
714 }
715
716 return 0;
717 errout:
718 return err;
719 }
720
721 static int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh,
722 struct netlink_ext_ack *extack)
723 {
724 struct net *net = sock_net(skb->sk);
725 struct fib_config cfg;
726 struct fib_table *tb;
727 int err;
728
729 err = rtm_to_fib_config(net, skb, nlh, &cfg, extack);
730 if (err < 0)
731 goto errout;
732
733 tb = fib_get_table(net, cfg.fc_table);
734 if (!tb) {
735 NL_SET_ERR_MSG(extack, "FIB table does not exist");
736 err = -ESRCH;
737 goto errout;
738 }
739
740 err = fib_table_delete(net, tb, &cfg, extack);
741 errout:
742 return err;
743 }
744
745 static int inet_rtm_newroute(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_new_table(net, cfg.fc_table);
758 if (!tb) {
759 err = -ENOBUFS;
760 goto errout;
761 }
762
763 err = fib_table_insert(net, tb, &cfg, extack);
764 errout:
765 return err;
766 }
767
768 static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb)
769 {
770 struct net *net = sock_net(skb->sk);
771 unsigned int h, s_h;
772 unsigned int e = 0, s_e;
773 struct fib_table *tb;
774 struct hlist_head *head;
775 int dumped = 0, err;
776
777 if (nlmsg_len(cb->nlh) >= sizeof(struct rtmsg) &&
778 ((struct rtmsg *) nlmsg_data(cb->nlh))->rtm_flags & RTM_F_CLONED)
779 return skb->len;
780
781 s_h = cb->args[0];
782 s_e = cb->args[1];
783
784 rcu_read_lock();
785
786 for (h = s_h; h < FIB_TABLE_HASHSZ; h++, s_e = 0) {
787 e = 0;
788 head = &net->ipv4.fib_table_hash[h];
789 hlist_for_each_entry_rcu(tb, head, tb_hlist) {
790 if (e < s_e)
791 goto next;
792 if (dumped)
793 memset(&cb->args[2], 0, sizeof(cb->args) -
794 2 * sizeof(cb->args[0]));
795 err = fib_table_dump(tb, skb, cb);
796 if (err < 0) {
797 if (likely(skb->len))
798 goto out;
799
800 goto out_err;
801 }
802 dumped = 1;
803 next:
804 e++;
805 }
806 }
807 out:
808 err = skb->len;
809 out_err:
810 rcu_read_unlock();
811
812 cb->args[1] = e;
813 cb->args[0] = h;
814
815 return err;
816 }
817
818 /* Prepare and feed intra-kernel routing request.
819 * Really, it should be netlink message, but :-( netlink
820 * can be not configured, so that we feed it directly
821 * to fib engine. It is legal, because all events occur
822 * only when netlink is already locked.
823 */
824 static void fib_magic(int cmd, int type, __be32 dst, int dst_len, struct in_ifaddr *ifa)
825 {
826 struct net *net = dev_net(ifa->ifa_dev->dev);
827 u32 tb_id = l3mdev_fib_table(ifa->ifa_dev->dev);
828 struct fib_table *tb;
829 struct fib_config cfg = {
830 .fc_protocol = RTPROT_KERNEL,
831 .fc_type = type,
832 .fc_dst = dst,
833 .fc_dst_len = dst_len,
834 .fc_prefsrc = ifa->ifa_local,
835 .fc_oif = ifa->ifa_dev->dev->ifindex,
836 .fc_nlflags = NLM_F_CREATE | NLM_F_APPEND,
837 .fc_nlinfo = {
838 .nl_net = net,
839 },
840 };
841
842 if (!tb_id)
843 tb_id = (type == RTN_UNICAST) ? RT_TABLE_MAIN : RT_TABLE_LOCAL;
844
845 tb = fib_new_table(net, tb_id);
846 if (!tb)
847 return;
848
849 cfg.fc_table = tb->tb_id;
850
851 if (type != RTN_LOCAL)
852 cfg.fc_scope = RT_SCOPE_LINK;
853 else
854 cfg.fc_scope = RT_SCOPE_HOST;
855
856 if (cmd == RTM_NEWROUTE)
857 fib_table_insert(net, tb, &cfg, NULL);
858 else
859 fib_table_delete(net, tb, &cfg, NULL);
860 }
861
862 void fib_add_ifaddr(struct in_ifaddr *ifa)
863 {
864 struct in_device *in_dev = ifa->ifa_dev;
865 struct net_device *dev = in_dev->dev;
866 struct in_ifaddr *prim = ifa;
867 __be32 mask = ifa->ifa_mask;
868 __be32 addr = ifa->ifa_local;
869 __be32 prefix = ifa->ifa_address & mask;
870
871 if (ifa->ifa_flags & IFA_F_SECONDARY) {
872 prim = inet_ifa_byprefix(in_dev, prefix, mask);
873 if (!prim) {
874 pr_warn("%s: bug: prim == NULL\n", __func__);
875 return;
876 }
877 }
878
879 fib_magic(RTM_NEWROUTE, RTN_LOCAL, addr, 32, prim);
880
881 if (!(dev->flags & IFF_UP))
882 return;
883
884 /* Add broadcast address, if it is explicitly assigned. */
885 if (ifa->ifa_broadcast && ifa->ifa_broadcast != htonl(0xFFFFFFFF))
886 fib_magic(RTM_NEWROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim);
887
888 if (!ipv4_is_zeronet(prefix) && !(ifa->ifa_flags & IFA_F_SECONDARY) &&
889 (prefix != addr || ifa->ifa_prefixlen < 32)) {
890 if (!(ifa->ifa_flags & IFA_F_NOPREFIXROUTE))
891 fib_magic(RTM_NEWROUTE,
892 dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST,
893 prefix, ifa->ifa_prefixlen, prim);
894
895 /* Add network specific broadcasts, when it takes a sense */
896 if (ifa->ifa_prefixlen < 31) {
897 fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix, 32, prim);
898 fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix | ~mask,
899 32, prim);
900 }
901 }
902 }
903
904 /* Delete primary or secondary address.
905 * Optionally, on secondary address promotion consider the addresses
906 * from subnet iprim as deleted, even if they are in device list.
907 * In this case the secondary ifa can be in device list.
908 */
909 void fib_del_ifaddr(struct in_ifaddr *ifa, struct in_ifaddr *iprim)
910 {
911 struct in_device *in_dev = ifa->ifa_dev;
912 struct net_device *dev = in_dev->dev;
913 struct in_ifaddr *ifa1;
914 struct in_ifaddr *prim = ifa, *prim1 = NULL;
915 __be32 brd = ifa->ifa_address | ~ifa->ifa_mask;
916 __be32 any = ifa->ifa_address & ifa->ifa_mask;
917 #define LOCAL_OK 1
918 #define BRD_OK 2
919 #define BRD0_OK 4
920 #define BRD1_OK 8
921 unsigned int ok = 0;
922 int subnet = 0; /* Primary network */
923 int gone = 1; /* Address is missing */
924 int same_prefsrc = 0; /* Another primary with same IP */
925
926 if (ifa->ifa_flags & IFA_F_SECONDARY) {
927 prim = inet_ifa_byprefix(in_dev, any, ifa->ifa_mask);
928 if (!prim) {
929 /* if the device has been deleted, we don't perform
930 * address promotion
931 */
932 if (!in_dev->dead)
933 pr_warn("%s: bug: prim == NULL\n", __func__);
934 return;
935 }
936 if (iprim && iprim != prim) {
937 pr_warn("%s: bug: iprim != prim\n", __func__);
938 return;
939 }
940 } else if (!ipv4_is_zeronet(any) &&
941 (any != ifa->ifa_local || ifa->ifa_prefixlen < 32)) {
942 if (!(ifa->ifa_flags & IFA_F_NOPREFIXROUTE))
943 fib_magic(RTM_DELROUTE,
944 dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST,
945 any, ifa->ifa_prefixlen, prim);
946 subnet = 1;
947 }
948
949 if (in_dev->dead)
950 goto no_promotions;
951
952 /* Deletion is more complicated than add.
953 * We should take care of not to delete too much :-)
954 *
955 * Scan address list to be sure that addresses are really gone.
956 */
957
958 for (ifa1 = in_dev->ifa_list; ifa1; ifa1 = ifa1->ifa_next) {
959 if (ifa1 == ifa) {
960 /* promotion, keep the IP */
961 gone = 0;
962 continue;
963 }
964 /* Ignore IFAs from our subnet */
965 if (iprim && ifa1->ifa_mask == iprim->ifa_mask &&
966 inet_ifa_match(ifa1->ifa_address, iprim))
967 continue;
968
969 /* Ignore ifa1 if it uses different primary IP (prefsrc) */
970 if (ifa1->ifa_flags & IFA_F_SECONDARY) {
971 /* Another address from our subnet? */
972 if (ifa1->ifa_mask == prim->ifa_mask &&
973 inet_ifa_match(ifa1->ifa_address, prim))
974 prim1 = prim;
975 else {
976 /* We reached the secondaries, so
977 * same_prefsrc should be determined.
978 */
979 if (!same_prefsrc)
980 continue;
981 /* Search new prim1 if ifa1 is not
982 * using the current prim1
983 */
984 if (!prim1 ||
985 ifa1->ifa_mask != prim1->ifa_mask ||
986 !inet_ifa_match(ifa1->ifa_address, prim1))
987 prim1 = inet_ifa_byprefix(in_dev,
988 ifa1->ifa_address,
989 ifa1->ifa_mask);
990 if (!prim1)
991 continue;
992 if (prim1->ifa_local != prim->ifa_local)
993 continue;
994 }
995 } else {
996 if (prim->ifa_local != ifa1->ifa_local)
997 continue;
998 prim1 = ifa1;
999 if (prim != prim1)
1000 same_prefsrc = 1;
1001 }
1002 if (ifa->ifa_local == ifa1->ifa_local)
1003 ok |= LOCAL_OK;
1004 if (ifa->ifa_broadcast == ifa1->ifa_broadcast)
1005 ok |= BRD_OK;
1006 if (brd == ifa1->ifa_broadcast)
1007 ok |= BRD1_OK;
1008 if (any == ifa1->ifa_broadcast)
1009 ok |= BRD0_OK;
1010 /* primary has network specific broadcasts */
1011 if (prim1 == ifa1 && ifa1->ifa_prefixlen < 31) {
1012 __be32 brd1 = ifa1->ifa_address | ~ifa1->ifa_mask;
1013 __be32 any1 = ifa1->ifa_address & ifa1->ifa_mask;
1014
1015 if (!ipv4_is_zeronet(any1)) {
1016 if (ifa->ifa_broadcast == brd1 ||
1017 ifa->ifa_broadcast == any1)
1018 ok |= BRD_OK;
1019 if (brd == brd1 || brd == any1)
1020 ok |= BRD1_OK;
1021 if (any == brd1 || any == any1)
1022 ok |= BRD0_OK;
1023 }
1024 }
1025 }
1026
1027 no_promotions:
1028 if (!(ok & BRD_OK))
1029 fib_magic(RTM_DELROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim);
1030 if (subnet && ifa->ifa_prefixlen < 31) {
1031 if (!(ok & BRD1_OK))
1032 fib_magic(RTM_DELROUTE, RTN_BROADCAST, brd, 32, prim);
1033 if (!(ok & BRD0_OK))
1034 fib_magic(RTM_DELROUTE, RTN_BROADCAST, any, 32, prim);
1035 }
1036 if (!(ok & LOCAL_OK)) {
1037 unsigned int addr_type;
1038
1039 fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 32, prim);
1040
1041 /* Check, that this local address finally disappeared. */
1042 addr_type = inet_addr_type_dev_table(dev_net(dev), dev,
1043 ifa->ifa_local);
1044 if (gone && addr_type != RTN_LOCAL) {
1045 /* And the last, but not the least thing.
1046 * We must flush stray FIB entries.
1047 *
1048 * First of all, we scan fib_info list searching
1049 * for stray nexthop entries, then ignite fib_flush.
1050 */
1051 if (fib_sync_down_addr(dev, ifa->ifa_local))
1052 fib_flush(dev_net(dev));
1053 }
1054 }
1055 #undef LOCAL_OK
1056 #undef BRD_OK
1057 #undef BRD0_OK
1058 #undef BRD1_OK
1059 }
1060
1061 static void nl_fib_lookup(struct net *net, struct fib_result_nl *frn)
1062 {
1063
1064 struct fib_result res;
1065 struct flowi4 fl4 = {
1066 .flowi4_mark = frn->fl_mark,
1067 .daddr = frn->fl_addr,
1068 .flowi4_tos = frn->fl_tos,
1069 .flowi4_scope = frn->fl_scope,
1070 };
1071 struct fib_table *tb;
1072
1073 rcu_read_lock();
1074
1075 tb = fib_get_table(net, frn->tb_id_in);
1076
1077 frn->err = -ENOENT;
1078 if (tb) {
1079 local_bh_disable();
1080
1081 frn->tb_id = tb->tb_id;
1082 frn->err = fib_table_lookup(tb, &fl4, &res, FIB_LOOKUP_NOREF);
1083
1084 if (!frn->err) {
1085 frn->prefixlen = res.prefixlen;
1086 frn->nh_sel = res.nh_sel;
1087 frn->type = res.type;
1088 frn->scope = res.scope;
1089 }
1090 local_bh_enable();
1091 }
1092
1093 rcu_read_unlock();
1094 }
1095
1096 static void nl_fib_input(struct sk_buff *skb)
1097 {
1098 struct net *net;
1099 struct fib_result_nl *frn;
1100 struct nlmsghdr *nlh;
1101 u32 portid;
1102
1103 net = sock_net(skb->sk);
1104 nlh = nlmsg_hdr(skb);
1105 if (skb->len < nlmsg_total_size(sizeof(*frn)) ||
1106 skb->len < nlh->nlmsg_len ||
1107 nlmsg_len(nlh) < sizeof(*frn))
1108 return;
1109
1110 skb = netlink_skb_clone(skb, GFP_KERNEL);
1111 if (!skb)
1112 return;
1113 nlh = nlmsg_hdr(skb);
1114
1115 frn = (struct fib_result_nl *) nlmsg_data(nlh);
1116 nl_fib_lookup(net, frn);
1117
1118 portid = NETLINK_CB(skb).portid; /* netlink portid */
1119 NETLINK_CB(skb).portid = 0; /* from kernel */
1120 NETLINK_CB(skb).dst_group = 0; /* unicast */
1121 netlink_unicast(net->ipv4.fibnl, skb, portid, MSG_DONTWAIT);
1122 }
1123
1124 static int __net_init nl_fib_lookup_init(struct net *net)
1125 {
1126 struct sock *sk;
1127 struct netlink_kernel_cfg cfg = {
1128 .input = nl_fib_input,
1129 };
1130
1131 sk = netlink_kernel_create(net, NETLINK_FIB_LOOKUP, &cfg);
1132 if (!sk)
1133 return -EAFNOSUPPORT;
1134 net->ipv4.fibnl = sk;
1135 return 0;
1136 }
1137
1138 static void nl_fib_lookup_exit(struct net *net)
1139 {
1140 netlink_kernel_release(net->ipv4.fibnl);
1141 net->ipv4.fibnl = NULL;
1142 }
1143
1144 static void fib_disable_ip(struct net_device *dev, unsigned long event,
1145 bool force)
1146 {
1147 if (fib_sync_down_dev(dev, event, force))
1148 fib_flush(dev_net(dev));
1149 else
1150 rt_cache_flush(dev_net(dev));
1151 arp_ifdown(dev);
1152 }
1153
1154 static int fib_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
1155 {
1156 struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
1157 struct net_device *dev = ifa->ifa_dev->dev;
1158 struct net *net = dev_net(dev);
1159
1160 switch (event) {
1161 case NETDEV_UP:
1162 fib_add_ifaddr(ifa);
1163 #ifdef CONFIG_IP_ROUTE_MULTIPATH
1164 fib_sync_up(dev, RTNH_F_DEAD);
1165 #endif
1166 atomic_inc(&net->ipv4.dev_addr_genid);
1167 rt_cache_flush(dev_net(dev));
1168 break;
1169 case NETDEV_DOWN:
1170 fib_del_ifaddr(ifa, NULL);
1171 atomic_inc(&net->ipv4.dev_addr_genid);
1172 if (!ifa->ifa_dev->ifa_list) {
1173 /* Last address was deleted from this interface.
1174 * Disable IP.
1175 */
1176 fib_disable_ip(dev, event, true);
1177 } else {
1178 rt_cache_flush(dev_net(dev));
1179 }
1180 break;
1181 }
1182 return NOTIFY_DONE;
1183 }
1184
1185 static int fib_netdev_event(struct notifier_block *this, unsigned long event, void *ptr)
1186 {
1187 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1188 struct netdev_notifier_changeupper_info *upper_info = ptr;
1189 struct netdev_notifier_info_ext *info_ext = ptr;
1190 struct in_device *in_dev;
1191 struct net *net = dev_net(dev);
1192 unsigned int flags;
1193
1194 if (event == NETDEV_UNREGISTER) {
1195 fib_disable_ip(dev, event, true);
1196 rt_flush_dev(dev);
1197 return NOTIFY_DONE;
1198 }
1199
1200 in_dev = __in_dev_get_rtnl(dev);
1201 if (!in_dev)
1202 return NOTIFY_DONE;
1203
1204 switch (event) {
1205 case NETDEV_UP:
1206 for_ifa(in_dev) {
1207 fib_add_ifaddr(ifa);
1208 } endfor_ifa(in_dev);
1209 #ifdef CONFIG_IP_ROUTE_MULTIPATH
1210 fib_sync_up(dev, RTNH_F_DEAD);
1211 #endif
1212 atomic_inc(&net->ipv4.dev_addr_genid);
1213 rt_cache_flush(net);
1214 break;
1215 case NETDEV_DOWN:
1216 fib_disable_ip(dev, event, false);
1217 break;
1218 case NETDEV_CHANGE:
1219 flags = dev_get_flags(dev);
1220 if (flags & (IFF_RUNNING | IFF_LOWER_UP))
1221 fib_sync_up(dev, RTNH_F_LINKDOWN);
1222 else
1223 fib_sync_down_dev(dev, event, false);
1224 rt_cache_flush(net);
1225 break;
1226 case NETDEV_CHANGEMTU:
1227 fib_sync_mtu(dev, info_ext->ext.mtu);
1228 rt_cache_flush(net);
1229 break;
1230 case NETDEV_CHANGEUPPER:
1231 upper_info = ptr;
1232 /* flush all routes if dev is linked to or unlinked from
1233 * an L3 master device (e.g., VRF)
1234 */
1235 if (upper_info->upper_dev &&
1236 netif_is_l3_master(upper_info->upper_dev))
1237 fib_disable_ip(dev, NETDEV_DOWN, true);
1238 break;
1239 }
1240 return NOTIFY_DONE;
1241 }
1242
1243 static struct notifier_block fib_inetaddr_notifier = {
1244 .notifier_call = fib_inetaddr_event,
1245 };
1246
1247 static struct notifier_block fib_netdev_notifier = {
1248 .notifier_call = fib_netdev_event,
1249 };
1250
1251 static int __net_init ip_fib_net_init(struct net *net)
1252 {
1253 int err;
1254 size_t size = sizeof(struct hlist_head) * FIB_TABLE_HASHSZ;
1255
1256 err = fib4_notifier_init(net);
1257 if (err)
1258 return err;
1259
1260 /* Avoid false sharing : Use at least a full cache line */
1261 size = max_t(size_t, size, L1_CACHE_BYTES);
1262
1263 net->ipv4.fib_table_hash = kzalloc(size, GFP_KERNEL);
1264 if (!net->ipv4.fib_table_hash) {
1265 err = -ENOMEM;
1266 goto err_table_hash_alloc;
1267 }
1268
1269 err = fib4_rules_init(net);
1270 if (err < 0)
1271 goto err_rules_init;
1272 return 0;
1273
1274 err_rules_init:
1275 kfree(net->ipv4.fib_table_hash);
1276 err_table_hash_alloc:
1277 fib4_notifier_exit(net);
1278 return err;
1279 }
1280
1281 static void ip_fib_net_exit(struct net *net)
1282 {
1283 int i;
1284
1285 rtnl_lock();
1286 #ifdef CONFIG_IP_MULTIPLE_TABLES
1287 RCU_INIT_POINTER(net->ipv4.fib_main, NULL);
1288 RCU_INIT_POINTER(net->ipv4.fib_default, NULL);
1289 #endif
1290 /* Destroy the tables in reverse order to guarantee that the
1291 * local table, ID 255, is destroyed before the main table, ID
1292 * 254. This is necessary as the local table may contain
1293 * references to data contained in the main table.
1294 */
1295 for (i = FIB_TABLE_HASHSZ - 1; i >= 0; i--) {
1296 struct hlist_head *head = &net->ipv4.fib_table_hash[i];
1297 struct hlist_node *tmp;
1298 struct fib_table *tb;
1299
1300 hlist_for_each_entry_safe(tb, tmp, head, tb_hlist) {
1301 hlist_del(&tb->tb_hlist);
1302 fib_table_flush(net, tb, true);
1303 fib_free_table(tb);
1304 }
1305 }
1306
1307 #ifdef CONFIG_IP_MULTIPLE_TABLES
1308 fib4_rules_exit(net);
1309 #endif
1310 rtnl_unlock();
1311 kfree(net->ipv4.fib_table_hash);
1312 fib4_notifier_exit(net);
1313 }
1314
1315 static int __net_init fib_net_init(struct net *net)
1316 {
1317 int error;
1318
1319 #ifdef CONFIG_IP_ROUTE_CLASSID
1320 net->ipv4.fib_num_tclassid_users = 0;
1321 #endif
1322 error = ip_fib_net_init(net);
1323 if (error < 0)
1324 goto out;
1325 error = nl_fib_lookup_init(net);
1326 if (error < 0)
1327 goto out_nlfl;
1328 error = fib_proc_init(net);
1329 if (error < 0)
1330 goto out_proc;
1331 out:
1332 return error;
1333
1334 out_proc:
1335 nl_fib_lookup_exit(net);
1336 out_nlfl:
1337 ip_fib_net_exit(net);
1338 goto out;
1339 }
1340
1341 static void __net_exit fib_net_exit(struct net *net)
1342 {
1343 fib_proc_exit(net);
1344 nl_fib_lookup_exit(net);
1345 ip_fib_net_exit(net);
1346 }
1347
1348 static struct pernet_operations fib_net_ops = {
1349 .init = fib_net_init,
1350 .exit = fib_net_exit,
1351 };
1352
1353 void __init ip_fib_init(void)
1354 {
1355 fib_trie_init();
1356
1357 register_pernet_subsys(&fib_net_ops);
1358
1359 register_netdevice_notifier(&fib_netdev_notifier);
1360 register_inetaddr_notifier(&fib_inetaddr_notifier);
1361
1362 rtnl_register(PF_INET, RTM_NEWROUTE, inet_rtm_newroute, NULL, 0);
1363 rtnl_register(PF_INET, RTM_DELROUTE, inet_rtm_delroute, NULL, 0);
1364 rtnl_register(PF_INET, RTM_GETROUTE, NULL, inet_dump_fib, 0);
1365 }
Mirror https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git