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18#include <linux/module.h>
19#include <asm/uaccess.h>
20#include <asm/system.h>
21#include <linux/bitops.h>
22#include <linux/capability.h>
23#include <linux/types.h>
24#include <linux/kernel.h>
25#include <linux/mm.h>
26#include <linux/string.h>
27#include <linux/socket.h>
28#include <linux/sockios.h>
29#include <linux/errno.h>
30#include <linux/in.h>
31#include <linux/inet.h>
32#include <linux/inetdevice.h>
33#include <linux/netdevice.h>
34#include <linux/if_addr.h>
35#include <linux/if_arp.h>
36#include <linux/skbuff.h>
37#include <linux/init.h>
38#include <linux/list.h>
39
40#include <net/ip.h>
41#include <net/protocol.h>
42#include <net/route.h>
43#include <net/tcp.h>
44#include <net/sock.h>
45#include <net/icmp.h>
46#include <net/arp.h>
47#include <net/ip_fib.h>
48#include <net/rtnetlink.h>
49
50#define FFprint(a...) printk(KERN_DEBUG a)
51
52static struct sock *fibnl;
53
54#ifndef CONFIG_IP_MULTIPLE_TABLES
55
56struct fib_table *ip_fib_local_table;
57struct fib_table *ip_fib_main_table;
58
59#define FIB_TABLE_HASHSZ 1
60static struct hlist_head fib_table_hash[FIB_TABLE_HASHSZ];
61
62static void __init fib4_rules_init(void)
63{
64 ip_fib_local_table = fib_hash_init(RT_TABLE_LOCAL);
65 hlist_add_head_rcu(&ip_fib_local_table->tb_hlist, &fib_table_hash[0]);
66 ip_fib_main_table = fib_hash_init(RT_TABLE_MAIN);
67 hlist_add_head_rcu(&ip_fib_main_table->tb_hlist, &fib_table_hash[0]);
68}
69#else
70
71#define FIB_TABLE_HASHSZ 256
72static struct hlist_head fib_table_hash[FIB_TABLE_HASHSZ];
73
74struct fib_table *fib_new_table(u32 id)
75{
76 struct fib_table *tb;
77 unsigned int h;
78
79 if (id == 0)
80 id = RT_TABLE_MAIN;
81 tb = fib_get_table(id);
82 if (tb)
83 return tb;
84 tb = fib_hash_init(id);
85 if (!tb)
86 return NULL;
87 h = id & (FIB_TABLE_HASHSZ - 1);
88 hlist_add_head_rcu(&tb->tb_hlist, &fib_table_hash[h]);
89 return tb;
90}
91
92struct fib_table *fib_get_table(u32 id)
93{
94 struct fib_table *tb;
95 struct hlist_node *node;
96 unsigned int h;
97
98 if (id == 0)
99 id = RT_TABLE_MAIN;
100 h = id & (FIB_TABLE_HASHSZ - 1);
101 rcu_read_lock();
102 hlist_for_each_entry_rcu(tb, node, &fib_table_hash[h], tb_hlist) {
103 if (tb->tb_id == id) {
104 rcu_read_unlock();
105 return tb;
106 }
107 }
108 rcu_read_unlock();
109 return NULL;
110}
111#endif
112
113static void fib_flush(void)
114{
115 int flushed = 0;
116 struct fib_table *tb;
117 struct hlist_node *node;
118 unsigned int h;
119
120 for (h = 0; h < FIB_TABLE_HASHSZ; h++) {
121 hlist_for_each_entry(tb, node, &fib_table_hash[h], tb_hlist)
122 flushed += tb->tb_flush(tb);
123 }
124
125 if (flushed)
126 rt_cache_flush(-1);
127}
128
129
130
131
132
133struct net_device * ip_dev_find(__be32 addr)
134{
135 struct flowi fl = { .nl_u = { .ip4_u = { .daddr = addr } } };
136 struct fib_result res;
137 struct net_device *dev = NULL;
138 struct fib_table *local_table;
139
140#ifdef CONFIG_IP_MULTIPLE_TABLES
141 res.r = NULL;
142#endif
143
144 local_table = fib_get_table(RT_TABLE_LOCAL);
145 if (!local_table || local_table->tb_lookup(local_table, &fl, &res))
146 return NULL;
147 if (res.type != RTN_LOCAL)
148 goto out;
149 dev = FIB_RES_DEV(res);
150
151 if (dev)
152 dev_hold(dev);
153out:
154 fib_res_put(&res);
155 return dev;
156}
157
158unsigned inet_addr_type(__be32 addr)
159{
160 struct flowi fl = { .nl_u = { .ip4_u = { .daddr = addr } } };
161 struct fib_result res;
162 unsigned ret = RTN_BROADCAST;
163 struct fib_table *local_table;
164
165 if (ZERONET(addr) || BADCLASS(addr))
166 return RTN_BROADCAST;
167 if (MULTICAST(addr))
168 return RTN_MULTICAST;
169
170#ifdef CONFIG_IP_MULTIPLE_TABLES
171 res.r = NULL;
172#endif
173
174 local_table = fib_get_table(RT_TABLE_LOCAL);
175 if (local_table) {
176 ret = RTN_UNICAST;
177 if (!local_table->tb_lookup(local_table, &fl, &res)) {
178 ret = res.type;
179 fib_res_put(&res);
180 }
181 }
182 return ret;
183}
184
185
186
187
188
189
190
191
192
193int fib_validate_source(__be32 src, __be32 dst, u8 tos, int oif,
194 struct net_device *dev, __be32 *spec_dst, u32 *itag)
195{
196 struct in_device *in_dev;
197 struct flowi fl = { .nl_u = { .ip4_u =
198 { .daddr = src,
199 .saddr = dst,
200 .tos = tos } },
201 .iif = oif };
202 struct fib_result res;
203 int no_addr, rpf;
204 int ret;
205
206 no_addr = rpf = 0;
207 rcu_read_lock();
208 in_dev = __in_dev_get_rcu(dev);
209 if (in_dev) {
210 no_addr = in_dev->ifa_list == NULL;
211 rpf = IN_DEV_RPFILTER(in_dev);
212 }
213 rcu_read_unlock();
214
215 if (in_dev == NULL)
216 goto e_inval;
217
218 if (fib_lookup(&fl, &res))
219 goto last_resort;
220 if (res.type != RTN_UNICAST)
221 goto e_inval_res;
222 *spec_dst = FIB_RES_PREFSRC(res);
223 fib_combine_itag(itag, &res);
224#ifdef CONFIG_IP_ROUTE_MULTIPATH
225 if (FIB_RES_DEV(res) == dev || res.fi->fib_nhs > 1)
226#else
227 if (FIB_RES_DEV(res) == dev)
228#endif
229 {
230 ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST;
231 fib_res_put(&res);
232 return ret;
233 }
234 fib_res_put(&res);
235 if (no_addr)
236 goto last_resort;
237 if (rpf)
238 goto e_inval;
239 fl.oif = dev->ifindex;
240
241 ret = 0;
242 if (fib_lookup(&fl, &res) == 0) {
243 if (res.type == RTN_UNICAST) {
244 *spec_dst = FIB_RES_PREFSRC(res);
245 ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST;
246 }
247 fib_res_put(&res);
248 }
249 return ret;
250
251last_resort:
252 if (rpf)
253 goto e_inval;
254 *spec_dst = inet_select_addr(dev, 0, RT_SCOPE_UNIVERSE);
255 *itag = 0;
256 return 0;
257
258e_inval_res:
259 fib_res_put(&res);
260e_inval:
261 return -EINVAL;
262}
263
264static inline __be32 sk_extract_addr(struct sockaddr *addr)
265{
266 return ((struct sockaddr_in *) addr)->sin_addr.s_addr;
267}
268
269static int put_rtax(struct nlattr *mx, int len, int type, u32 value)
270{
271 struct nlattr *nla;
272
273 nla = (struct nlattr *) ((char *) mx + len);
274 nla->nla_type = type;
275 nla->nla_len = nla_attr_size(4);
276 *(u32 *) nla_data(nla) = value;
277
278 return len + nla_total_size(4);
279}
280
281static int rtentry_to_fib_config(int cmd, struct rtentry *rt,
282 struct fib_config *cfg)
283{
284 __be32 addr;
285 int plen;
286
287 memset(cfg, 0, sizeof(*cfg));
288
289 if (rt->rt_dst.sa_family != AF_INET)
290 return -EAFNOSUPPORT;
291
292
293
294
295
296
297
298
299
300 plen = 32;
301 addr = sk_extract_addr(&rt->rt_dst);
302 if (!(rt->rt_flags & RTF_HOST)) {
303 __be32 mask = sk_extract_addr(&rt->rt_genmask);
304
305 if (rt->rt_genmask.sa_family != AF_INET) {
306 if (mask || rt->rt_genmask.sa_family)
307 return -EAFNOSUPPORT;
308 }
309
310 if (bad_mask(mask, addr))
311 return -EINVAL;
312
313 plen = inet_mask_len(mask);
314 }
315
316 cfg->fc_dst_len = plen;
317 cfg->fc_dst = addr;
318
319 if (cmd != SIOCDELRT) {
320 cfg->fc_nlflags = NLM_F_CREATE;
321 cfg->fc_protocol = RTPROT_BOOT;
322 }
323
324 if (rt->rt_metric)
325 cfg->fc_priority = rt->rt_metric - 1;
326
327 if (rt->rt_flags & RTF_REJECT) {
328 cfg->fc_scope = RT_SCOPE_HOST;
329 cfg->fc_type = RTN_UNREACHABLE;
330 return 0;
331 }
332
333 cfg->fc_scope = RT_SCOPE_NOWHERE;
334 cfg->fc_type = RTN_UNICAST;
335
336 if (rt->rt_dev) {
337 char *colon;
338 struct net_device *dev;
339 char devname[IFNAMSIZ];
340
341 if (copy_from_user(devname, rt->rt_dev, IFNAMSIZ-1))
342 return -EFAULT;
343
344 devname[IFNAMSIZ-1] = 0;
345 colon = strchr(devname, ':');
346 if (colon)
347 *colon = 0;
348 dev = __dev_get_by_name(&init_net, devname);
349 if (!dev)
350 return -ENODEV;
351 cfg->fc_oif = dev->ifindex;
352 if (colon) {
353 struct in_ifaddr *ifa;
354 struct in_device *in_dev = __in_dev_get_rtnl(dev);
355 if (!in_dev)
356 return -ENODEV;
357 *colon = ':';
358 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next)
359 if (strcmp(ifa->ifa_label, devname) == 0)
360 break;
361 if (ifa == NULL)
362 return -ENODEV;
363 cfg->fc_prefsrc = ifa->ifa_local;
364 }
365 }
366
367 addr = sk_extract_addr(&rt->rt_gateway);
368 if (rt->rt_gateway.sa_family == AF_INET && addr) {
369 cfg->fc_gw = addr;
370 if (rt->rt_flags & RTF_GATEWAY &&
371 inet_addr_type(addr) == RTN_UNICAST)
372 cfg->fc_scope = RT_SCOPE_UNIVERSE;
373 }
374
375 if (cmd == SIOCDELRT)
376 return 0;
377
378 if (rt->rt_flags & RTF_GATEWAY && !cfg->fc_gw)
379 return -EINVAL;
380
381 if (cfg->fc_scope == RT_SCOPE_NOWHERE)
382 cfg->fc_scope = RT_SCOPE_LINK;
383
384 if (rt->rt_flags & (RTF_MTU | RTF_WINDOW | RTF_IRTT)) {
385 struct nlattr *mx;
386 int len = 0;
387
388 mx = kzalloc(3 * nla_total_size(4), GFP_KERNEL);
389 if (mx == NULL)
390 return -ENOMEM;
391
392 if (rt->rt_flags & RTF_MTU)
393 len = put_rtax(mx, len, RTAX_ADVMSS, rt->rt_mtu - 40);
394
395 if (rt->rt_flags & RTF_WINDOW)
396 len = put_rtax(mx, len, RTAX_WINDOW, rt->rt_window);
397
398 if (rt->rt_flags & RTF_IRTT)
399 len = put_rtax(mx, len, RTAX_RTT, rt->rt_irtt << 3);
400
401 cfg->fc_mx = mx;
402 cfg->fc_mx_len = len;
403 }
404
405 return 0;
406}
407
408
409
410
411
412int ip_rt_ioctl(unsigned int cmd, void __user *arg)
413{
414 struct fib_config cfg;
415 struct rtentry rt;
416 int err;
417
418 switch (cmd) {
419 case SIOCADDRT:
420 case SIOCDELRT:
421 if (!capable(CAP_NET_ADMIN))
422 return -EPERM;
423
424 if (copy_from_user(&rt, arg, sizeof(rt)))
425 return -EFAULT;
426
427 rtnl_lock();
428 err = rtentry_to_fib_config(cmd, &rt, &cfg);
429 if (err == 0) {
430 struct fib_table *tb;
431
432 if (cmd == SIOCDELRT) {
433 tb = fib_get_table(cfg.fc_table);
434 if (tb)
435 err = tb->tb_delete(tb, &cfg);
436 else
437 err = -ESRCH;
438 } else {
439 tb = fib_new_table(cfg.fc_table);
440 if (tb)
441 err = tb->tb_insert(tb, &cfg);
442 else
443 err = -ENOBUFS;
444 }
445
446
447 kfree(cfg.fc_mx);
448 }
449 rtnl_unlock();
450 return err;
451 }
452 return -EINVAL;
453}
454
455const struct nla_policy rtm_ipv4_policy[RTA_MAX+1] = {
456 [RTA_DST] = { .type = NLA_U32 },
457 [RTA_SRC] = { .type = NLA_U32 },
458 [RTA_IIF] = { .type = NLA_U32 },
459 [RTA_OIF] = { .type = NLA_U32 },
460 [RTA_GATEWAY] = { .type = NLA_U32 },
461 [RTA_PRIORITY] = { .type = NLA_U32 },
462 [RTA_PREFSRC] = { .type = NLA_U32 },
463 [RTA_METRICS] = { .type = NLA_NESTED },
464 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
465 [RTA_PROTOINFO] = { .type = NLA_U32 },
466 [RTA_FLOW] = { .type = NLA_U32 },
467};
468
469static int rtm_to_fib_config(struct sk_buff *skb, struct nlmsghdr *nlh,
470 struct fib_config *cfg)
471{
472 struct nlattr *attr;
473 int err, remaining;
474 struct rtmsg *rtm;
475
476 err = nlmsg_validate(nlh, sizeof(*rtm), RTA_MAX, rtm_ipv4_policy);
477 if (err < 0)
478 goto errout;
479
480 memset(cfg, 0, sizeof(*cfg));
481
482 rtm = nlmsg_data(nlh);
483 cfg->fc_dst_len = rtm->rtm_dst_len;
484 cfg->fc_tos = rtm->rtm_tos;
485 cfg->fc_table = rtm->rtm_table;
486 cfg->fc_protocol = rtm->rtm_protocol;
487 cfg->fc_scope = rtm->rtm_scope;
488 cfg->fc_type = rtm->rtm_type;
489 cfg->fc_flags = rtm->rtm_flags;
490 cfg->fc_nlflags = nlh->nlmsg_flags;
491
492 cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid;
493 cfg->fc_nlinfo.nlh = nlh;
494
495 if (cfg->fc_type > RTN_MAX) {
496 err = -EINVAL;
497 goto errout;
498 }
499
500 nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), remaining) {
501 switch (nla_type(attr)) {
502 case RTA_DST:
503 cfg->fc_dst = nla_get_be32(attr);
504 break;
505 case RTA_OIF:
506 cfg->fc_oif = nla_get_u32(attr);
507 break;
508 case RTA_GATEWAY:
509 cfg->fc_gw = nla_get_be32(attr);
510 break;
511 case RTA_PRIORITY:
512 cfg->fc_priority = nla_get_u32(attr);
513 break;
514 case RTA_PREFSRC:
515 cfg->fc_prefsrc = nla_get_be32(attr);
516 break;
517 case RTA_METRICS:
518 cfg->fc_mx = nla_data(attr);
519 cfg->fc_mx_len = nla_len(attr);
520 break;
521 case RTA_MULTIPATH:
522 cfg->fc_mp = nla_data(attr);
523 cfg->fc_mp_len = nla_len(attr);
524 break;
525 case RTA_FLOW:
526 cfg->fc_flow = nla_get_u32(attr);
527 break;
528 case RTA_TABLE:
529 cfg->fc_table = nla_get_u32(attr);
530 break;
531 }
532 }
533
534 return 0;
535errout:
536 return err;
537}
538
539static int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
540{
541 struct fib_config cfg;
542 struct fib_table *tb;
543 int err;
544
545 err = rtm_to_fib_config(skb, nlh, &cfg);
546 if (err < 0)
547 goto errout;
548
549 tb = fib_get_table(cfg.fc_table);
550 if (tb == NULL) {
551 err = -ESRCH;
552 goto errout;
553 }
554
555 err = tb->tb_delete(tb, &cfg);
556errout:
557 return err;
558}
559
560static int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
561{
562 struct fib_config cfg;
563 struct fib_table *tb;
564 int err;
565
566 err = rtm_to_fib_config(skb, nlh, &cfg);
567 if (err < 0)
568 goto errout;
569
570 tb = fib_new_table(cfg.fc_table);
571 if (tb == NULL) {
572 err = -ENOBUFS;
573 goto errout;
574 }
575
576 err = tb->tb_insert(tb, &cfg);
577errout:
578 return err;
579}
580
581static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb)
582{
583 unsigned int h, s_h;
584 unsigned int e = 0, s_e;
585 struct fib_table *tb;
586 struct hlist_node *node;
587 int dumped = 0;
588
589 if (nlmsg_len(cb->nlh) >= sizeof(struct rtmsg) &&
590 ((struct rtmsg *) nlmsg_data(cb->nlh))->rtm_flags & RTM_F_CLONED)
591 return ip_rt_dump(skb, cb);
592
593 s_h = cb->args[0];
594 s_e = cb->args[1];
595
596 for (h = s_h; h < FIB_TABLE_HASHSZ; h++, s_e = 0) {
597 e = 0;
598 hlist_for_each_entry(tb, node, &fib_table_hash[h], tb_hlist) {
599 if (e < s_e)
600 goto next;
601 if (dumped)
602 memset(&cb->args[2], 0, sizeof(cb->args) -
603 2 * sizeof(cb->args[0]));
604 if (tb->tb_dump(tb, skb, cb) < 0)
605 goto out;
606 dumped = 1;
607next:
608 e++;
609 }
610 }
611out:
612 cb->args[1] = e;
613 cb->args[0] = h;
614
615 return skb->len;
616}
617
618
619
620
621
622
623
624
625static void fib_magic(int cmd, int type, __be32 dst, int dst_len, struct in_ifaddr *ifa)
626{
627 struct fib_table *tb;
628 struct fib_config cfg = {
629 .fc_protocol = RTPROT_KERNEL,
630 .fc_type = type,
631 .fc_dst = dst,
632 .fc_dst_len = dst_len,
633 .fc_prefsrc = ifa->ifa_local,
634 .fc_oif = ifa->ifa_dev->dev->ifindex,
635 .fc_nlflags = NLM_F_CREATE | NLM_F_APPEND,
636 };
637
638 if (type == RTN_UNICAST)
639 tb = fib_new_table(RT_TABLE_MAIN);
640 else
641 tb = fib_new_table(RT_TABLE_LOCAL);
642
643 if (tb == NULL)
644 return;
645
646 cfg.fc_table = tb->tb_id;
647
648 if (type != RTN_LOCAL)
649 cfg.fc_scope = RT_SCOPE_LINK;
650 else
651 cfg.fc_scope = RT_SCOPE_HOST;
652
653 if (cmd == RTM_NEWROUTE)
654 tb->tb_insert(tb, &cfg);
655 else
656 tb->tb_delete(tb, &cfg);
657}
658
659void fib_add_ifaddr(struct in_ifaddr *ifa)
660{
661 struct in_device *in_dev = ifa->ifa_dev;
662 struct net_device *dev = in_dev->dev;
663 struct in_ifaddr *prim = ifa;
664 __be32 mask = ifa->ifa_mask;
665 __be32 addr = ifa->ifa_local;
666 __be32 prefix = ifa->ifa_address&mask;
667
668 if (ifa->ifa_flags&IFA_F_SECONDARY) {
669 prim = inet_ifa_byprefix(in_dev, prefix, mask);
670 if (prim == NULL) {
671 printk(KERN_DEBUG "fib_add_ifaddr: bug: prim == NULL\n");
672 return;
673 }
674 }
675
676 fib_magic(RTM_NEWROUTE, RTN_LOCAL, addr, 32, prim);
677
678 if (!(dev->flags&IFF_UP))
679 return;
680
681
682 if (ifa->ifa_broadcast && ifa->ifa_broadcast != htonl(0xFFFFFFFF))
683 fib_magic(RTM_NEWROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim);
684
685 if (!ZERONET(prefix) && !(ifa->ifa_flags&IFA_F_SECONDARY) &&
686 (prefix != addr || ifa->ifa_prefixlen < 32)) {
687 fib_magic(RTM_NEWROUTE, dev->flags&IFF_LOOPBACK ? RTN_LOCAL :
688 RTN_UNICAST, prefix, ifa->ifa_prefixlen, prim);
689
690
691 if (ifa->ifa_prefixlen < 31) {
692 fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix, 32, prim);
693 fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix|~mask, 32, prim);
694 }
695 }
696}
697
698static void fib_del_ifaddr(struct in_ifaddr *ifa)
699{
700 struct in_device *in_dev = ifa->ifa_dev;
701 struct net_device *dev = in_dev->dev;
702 struct in_ifaddr *ifa1;
703 struct in_ifaddr *prim = ifa;
704 __be32 brd = ifa->ifa_address|~ifa->ifa_mask;
705 __be32 any = ifa->ifa_address&ifa->ifa_mask;
706#define LOCAL_OK 1
707#define BRD_OK 2
708#define BRD0_OK 4
709#define BRD1_OK 8
710 unsigned ok = 0;
711
712 if (!(ifa->ifa_flags&IFA_F_SECONDARY))
713 fib_magic(RTM_DELROUTE, dev->flags&IFF_LOOPBACK ? RTN_LOCAL :
714 RTN_UNICAST, any, ifa->ifa_prefixlen, prim);
715 else {
716 prim = inet_ifa_byprefix(in_dev, any, ifa->ifa_mask);
717 if (prim == NULL) {
718 printk(KERN_DEBUG "fib_del_ifaddr: bug: prim == NULL\n");
719 return;
720 }
721 }
722
723
724
725
726
727
728
729 for (ifa1 = in_dev->ifa_list; ifa1; ifa1 = ifa1->ifa_next) {
730 if (ifa->ifa_local == ifa1->ifa_local)
731 ok |= LOCAL_OK;
732 if (ifa->ifa_broadcast == ifa1->ifa_broadcast)
733 ok |= BRD_OK;
734 if (brd == ifa1->ifa_broadcast)
735 ok |= BRD1_OK;
736 if (any == ifa1->ifa_broadcast)
737 ok |= BRD0_OK;
738 }
739
740 if (!(ok&BRD_OK))
741 fib_magic(RTM_DELROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim);
742 if (!(ok&BRD1_OK))
743 fib_magic(RTM_DELROUTE, RTN_BROADCAST, brd, 32, prim);
744 if (!(ok&BRD0_OK))
745 fib_magic(RTM_DELROUTE, RTN_BROADCAST, any, 32, prim);
746 if (!(ok&LOCAL_OK)) {
747 fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 32, prim);
748
749
750 if (inet_addr_type(ifa->ifa_local) != RTN_LOCAL) {
751
752
753
754
755
756
757 if (fib_sync_down(ifa->ifa_local, NULL, 0))
758 fib_flush();
759 }
760 }
761#undef LOCAL_OK
762#undef BRD_OK
763#undef BRD0_OK
764#undef BRD1_OK
765}
766
767static void nl_fib_lookup(struct fib_result_nl *frn, struct fib_table *tb )
768{
769
770 struct fib_result res;
771 struct flowi fl = { .mark = frn->fl_mark,
772 .nl_u = { .ip4_u = { .daddr = frn->fl_addr,
773 .tos = frn->fl_tos,
774 .scope = frn->fl_scope } } };
775
776#ifdef CONFIG_IP_MULTIPLE_TABLES
777 res.r = NULL;
778#endif
779
780 frn->err = -ENOENT;
781 if (tb) {
782 local_bh_disable();
783
784 frn->tb_id = tb->tb_id;
785 frn->err = tb->tb_lookup(tb, &fl, &res);
786
787 if (!frn->err) {
788 frn->prefixlen = res.prefixlen;
789 frn->nh_sel = res.nh_sel;
790 frn->type = res.type;
791 frn->scope = res.scope;
792 fib_res_put(&res);
793 }
794 local_bh_enable();
795 }
796}
797
798static void nl_fib_input(struct sk_buff *skb)
799{
800 struct fib_result_nl *frn;
801 struct nlmsghdr *nlh;
802 struct fib_table *tb;
803 u32 pid;
804
805 nlh = nlmsg_hdr(skb);
806 if (skb->len < NLMSG_SPACE(0) || skb->len < nlh->nlmsg_len ||
807 nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*frn)))
808 return;
809
810 skb = skb_clone(skb, GFP_KERNEL);
811 if (skb == NULL)
812 return;
813 nlh = nlmsg_hdr(skb);
814
815 frn = (struct fib_result_nl *) NLMSG_DATA(nlh);
816 tb = fib_get_table(frn->tb_id_in);
817
818 nl_fib_lookup(frn, tb);
819
820 pid = NETLINK_CB(skb).pid;
821 NETLINK_CB(skb).pid = 0;
822 NETLINK_CB(skb).dst_group = 0;
823 netlink_unicast(fibnl, skb, pid, MSG_DONTWAIT);
824}
825
826static void nl_fib_lookup_init(void)
827{
828 fibnl = netlink_kernel_create(&init_net, NETLINK_FIB_LOOKUP, 0,
829 nl_fib_input, NULL, THIS_MODULE);
830}
831
832static void fib_disable_ip(struct net_device *dev, int force)
833{
834 if (fib_sync_down(0, dev, force))
835 fib_flush();
836 rt_cache_flush(0);
837 arp_ifdown(dev);
838}
839
840static int fib_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
841{
842 struct in_ifaddr *ifa = (struct in_ifaddr*)ptr;
843
844 switch (event) {
845 case NETDEV_UP:
846 fib_add_ifaddr(ifa);
847#ifdef CONFIG_IP_ROUTE_MULTIPATH
848 fib_sync_up(ifa->ifa_dev->dev);
849#endif
850 rt_cache_flush(-1);
851 break;
852 case NETDEV_DOWN:
853 fib_del_ifaddr(ifa);
854 if (ifa->ifa_dev->ifa_list == NULL) {
855
856
857
858 fib_disable_ip(ifa->ifa_dev->dev, 1);
859 } else {
860 rt_cache_flush(-1);
861 }
862 break;
863 }
864 return NOTIFY_DONE;
865}
866
867static int fib_netdev_event(struct notifier_block *this, unsigned long event, void *ptr)
868{
869 struct net_device *dev = ptr;
870 struct in_device *in_dev = __in_dev_get_rtnl(dev);
871
872 if (dev->nd_net != &init_net)
873 return NOTIFY_DONE;
874
875 if (event == NETDEV_UNREGISTER) {
876 fib_disable_ip(dev, 2);
877 return NOTIFY_DONE;
878 }
879
880 if (!in_dev)
881 return NOTIFY_DONE;
882
883 switch (event) {
884 case NETDEV_UP:
885 for_ifa(in_dev) {
886 fib_add_ifaddr(ifa);
887 } endfor_ifa(in_dev);
888#ifdef CONFIG_IP_ROUTE_MULTIPATH
889 fib_sync_up(dev);
890#endif
891 rt_cache_flush(-1);
892 break;
893 case NETDEV_DOWN:
894 fib_disable_ip(dev, 0);
895 break;
896 case NETDEV_CHANGEMTU:
897 case NETDEV_CHANGE:
898 rt_cache_flush(0);
899 break;
900 }
901 return NOTIFY_DONE;
902}
903
904static struct notifier_block fib_inetaddr_notifier = {
905 .notifier_call =fib_inetaddr_event,
906};
907
908static struct notifier_block fib_netdev_notifier = {
909 .notifier_call =fib_netdev_event,
910};
911
912void __init ip_fib_init(void)
913{
914 unsigned int i;
915
916 for (i = 0; i < FIB_TABLE_HASHSZ; i++)
917 INIT_HLIST_HEAD(&fib_table_hash[i]);
918
919 fib4_rules_init();
920
921 register_netdevice_notifier(&fib_netdev_notifier);
922 register_inetaddr_notifier(&fib_inetaddr_notifier);
923 nl_fib_lookup_init();
924
925 rtnl_register(PF_INET, RTM_NEWROUTE, inet_rtm_newroute, NULL);
926 rtnl_register(PF_INET, RTM_DELROUTE, inet_rtm_delroute, NULL);
927 rtnl_register(PF_INET, RTM_GETROUTE, NULL, inet_dump_fib);
928}
929
930EXPORT_SYMBOL(inet_addr_type);
931EXPORT_SYMBOL(ip_dev_find);
932
