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[IPV4]: Enable use of 240/4 address space.
[deliverable/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 * Version: $Id: fib_frontend.c,v 1.26 2001/10/31 21:55:54 davem Exp $
9 *
10 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version
15 * 2 of the License, or (at your option) any later version.
16 */
17
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 #ifndef CONFIG_IP_MULTIPLE_TABLES
51
52 static int __net_init fib4_rules_init(struct net *net)
53 {
54 struct fib_table *local_table, *main_table;
55
56 local_table = fib_hash_table(RT_TABLE_LOCAL);
57 if (local_table == NULL)
58 return -ENOMEM;
59
60 main_table = fib_hash_table(RT_TABLE_MAIN);
61 if (main_table == NULL)
62 goto fail;
63
64 hlist_add_head_rcu(&local_table->tb_hlist,
65 &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX]);
66 hlist_add_head_rcu(&main_table->tb_hlist,
67 &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX]);
68 return 0;
69
70 fail:
71 kfree(local_table);
72 return -ENOMEM;
73 }
74 #else
75
76 struct fib_table *fib_new_table(struct net *net, u32 id)
77 {
78 struct fib_table *tb;
79 unsigned int h;
80
81 if (id == 0)
82 id = RT_TABLE_MAIN;
83 tb = fib_get_table(net, id);
84 if (tb)
85 return tb;
86
87 tb = fib_hash_table(id);
88 if (!tb)
89 return NULL;
90 h = id & (FIB_TABLE_HASHSZ - 1);
91 hlist_add_head_rcu(&tb->tb_hlist, &net->ipv4.fib_table_hash[h]);
92 return tb;
93 }
94
95 struct fib_table *fib_get_table(struct net *net, u32 id)
96 {
97 struct fib_table *tb;
98 struct hlist_node *node;
99 struct hlist_head *head;
100 unsigned int h;
101
102 if (id == 0)
103 id = RT_TABLE_MAIN;
104 h = id & (FIB_TABLE_HASHSZ - 1);
105
106 rcu_read_lock();
107 head = &net->ipv4.fib_table_hash[h];
108 hlist_for_each_entry_rcu(tb, node, head, tb_hlist) {
109 if (tb->tb_id == id) {
110 rcu_read_unlock();
111 return tb;
112 }
113 }
114 rcu_read_unlock();
115 return NULL;
116 }
117 #endif /* CONFIG_IP_MULTIPLE_TABLES */
118
119 static void fib_flush(struct net *net)
120 {
121 int flushed = 0;
122 struct fib_table *tb;
123 struct hlist_node *node;
124 struct hlist_head *head;
125 unsigned int h;
126
127 for (h = 0; h < FIB_TABLE_HASHSZ; h++) {
128 head = &net->ipv4.fib_table_hash[h];
129 hlist_for_each_entry(tb, node, head, tb_hlist)
130 flushed += tb->tb_flush(tb);
131 }
132
133 if (flushed)
134 rt_cache_flush(-1);
135 }
136
137 /*
138 * Find the first device with a given source address.
139 */
140
141 struct net_device * ip_dev_find(__be32 addr)
142 {
143 struct flowi fl = { .nl_u = { .ip4_u = { .daddr = addr } } };
144 struct fib_result res;
145 struct net_device *dev = NULL;
146 struct fib_table *local_table;
147
148 #ifdef CONFIG_IP_MULTIPLE_TABLES
149 res.r = NULL;
150 #endif
151
152 local_table = fib_get_table(&init_net, RT_TABLE_LOCAL);
153 if (!local_table || local_table->tb_lookup(local_table, &fl, &res))
154 return NULL;
155 if (res.type != RTN_LOCAL)
156 goto out;
157 dev = FIB_RES_DEV(res);
158
159 if (dev)
160 dev_hold(dev);
161 out:
162 fib_res_put(&res);
163 return dev;
164 }
165
166 /*
167 * Find address type as if only "dev" was present in the system. If
168 * on_dev is NULL then all interfaces are taken into consideration.
169 */
170 static inline unsigned __inet_dev_addr_type(struct net *net,
171 const struct net_device *dev,
172 __be32 addr)
173 {
174 struct flowi fl = { .nl_u = { .ip4_u = { .daddr = addr } } };
175 struct fib_result res;
176 unsigned ret = RTN_BROADCAST;
177 struct fib_table *local_table;
178
179 if (ipv4_is_zeronet(addr) || ipv4_is_lbcast(addr))
180 return RTN_BROADCAST;
181 if (ipv4_is_multicast(addr))
182 return RTN_MULTICAST;
183
184 #ifdef CONFIG_IP_MULTIPLE_TABLES
185 res.r = NULL;
186 #endif
187
188 local_table = fib_get_table(net, RT_TABLE_LOCAL);
189 if (local_table) {
190 ret = RTN_UNICAST;
191 if (!local_table->tb_lookup(local_table, &fl, &res)) {
192 if (!dev || dev == res.fi->fib_dev)
193 ret = res.type;
194 fib_res_put(&res);
195 }
196 }
197 return ret;
198 }
199
200 unsigned int inet_addr_type(struct net *net, __be32 addr)
201 {
202 return __inet_dev_addr_type(net, NULL, addr);
203 }
204
205 unsigned int inet_dev_addr_type(struct net *net, const struct net_device *dev,
206 __be32 addr)
207 {
208 return __inet_dev_addr_type(net, dev, addr);
209 }
210
211 /* Given (packet source, input interface) and optional (dst, oif, tos):
212 - (main) check, that source is valid i.e. not broadcast or our local
213 address.
214 - figure out what "logical" interface this packet arrived
215 and calculate "specific destination" address.
216 - check, that packet arrived from expected physical interface.
217 */
218
219 int fib_validate_source(__be32 src, __be32 dst, u8 tos, int oif,
220 struct net_device *dev, __be32 *spec_dst, u32 *itag)
221 {
222 struct in_device *in_dev;
223 struct flowi fl = { .nl_u = { .ip4_u =
224 { .daddr = src,
225 .saddr = dst,
226 .tos = tos } },
227 .iif = oif };
228 struct fib_result res;
229 int no_addr, rpf;
230 int ret;
231
232 no_addr = rpf = 0;
233 rcu_read_lock();
234 in_dev = __in_dev_get_rcu(dev);
235 if (in_dev) {
236 no_addr = in_dev->ifa_list == NULL;
237 rpf = IN_DEV_RPFILTER(in_dev);
238 }
239 rcu_read_unlock();
240
241 if (in_dev == NULL)
242 goto e_inval;
243
244 if (fib_lookup(&fl, &res))
245 goto last_resort;
246 if (res.type != RTN_UNICAST)
247 goto e_inval_res;
248 *spec_dst = FIB_RES_PREFSRC(res);
249 fib_combine_itag(itag, &res);
250 #ifdef CONFIG_IP_ROUTE_MULTIPATH
251 if (FIB_RES_DEV(res) == dev || res.fi->fib_nhs > 1)
252 #else
253 if (FIB_RES_DEV(res) == dev)
254 #endif
255 {
256 ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST;
257 fib_res_put(&res);
258 return ret;
259 }
260 fib_res_put(&res);
261 if (no_addr)
262 goto last_resort;
263 if (rpf)
264 goto e_inval;
265 fl.oif = dev->ifindex;
266
267 ret = 0;
268 if (fib_lookup(&fl, &res) == 0) {
269 if (res.type == RTN_UNICAST) {
270 *spec_dst = FIB_RES_PREFSRC(res);
271 ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST;
272 }
273 fib_res_put(&res);
274 }
275 return ret;
276
277 last_resort:
278 if (rpf)
279 goto e_inval;
280 *spec_dst = inet_select_addr(dev, 0, RT_SCOPE_UNIVERSE);
281 *itag = 0;
282 return 0;
283
284 e_inval_res:
285 fib_res_put(&res);
286 e_inval:
287 return -EINVAL;
288 }
289
290 static inline __be32 sk_extract_addr(struct sockaddr *addr)
291 {
292 return ((struct sockaddr_in *) addr)->sin_addr.s_addr;
293 }
294
295 static int put_rtax(struct nlattr *mx, int len, int type, u32 value)
296 {
297 struct nlattr *nla;
298
299 nla = (struct nlattr *) ((char *) mx + len);
300 nla->nla_type = type;
301 nla->nla_len = nla_attr_size(4);
302 *(u32 *) nla_data(nla) = value;
303
304 return len + nla_total_size(4);
305 }
306
307 static int rtentry_to_fib_config(struct net *net, int cmd, struct rtentry *rt,
308 struct fib_config *cfg)
309 {
310 __be32 addr;
311 int plen;
312
313 memset(cfg, 0, sizeof(*cfg));
314 cfg->fc_nlinfo.nl_net = net;
315
316 if (rt->rt_dst.sa_family != AF_INET)
317 return -EAFNOSUPPORT;
318
319 /*
320 * Check mask for validity:
321 * a) it must be contiguous.
322 * b) destination must have all host bits clear.
323 * c) if application forgot to set correct family (AF_INET),
324 * reject request unless it is absolutely clear i.e.
325 * both family and mask are zero.
326 */
327 plen = 32;
328 addr = sk_extract_addr(&rt->rt_dst);
329 if (!(rt->rt_flags & RTF_HOST)) {
330 __be32 mask = sk_extract_addr(&rt->rt_genmask);
331
332 if (rt->rt_genmask.sa_family != AF_INET) {
333 if (mask || rt->rt_genmask.sa_family)
334 return -EAFNOSUPPORT;
335 }
336
337 if (bad_mask(mask, addr))
338 return -EINVAL;
339
340 plen = inet_mask_len(mask);
341 }
342
343 cfg->fc_dst_len = plen;
344 cfg->fc_dst = addr;
345
346 if (cmd != SIOCDELRT) {
347 cfg->fc_nlflags = NLM_F_CREATE;
348 cfg->fc_protocol = RTPROT_BOOT;
349 }
350
351 if (rt->rt_metric)
352 cfg->fc_priority = rt->rt_metric - 1;
353
354 if (rt->rt_flags & RTF_REJECT) {
355 cfg->fc_scope = RT_SCOPE_HOST;
356 cfg->fc_type = RTN_UNREACHABLE;
357 return 0;
358 }
359
360 cfg->fc_scope = RT_SCOPE_NOWHERE;
361 cfg->fc_type = RTN_UNICAST;
362
363 if (rt->rt_dev) {
364 char *colon;
365 struct net_device *dev;
366 char devname[IFNAMSIZ];
367
368 if (copy_from_user(devname, rt->rt_dev, IFNAMSIZ-1))
369 return -EFAULT;
370
371 devname[IFNAMSIZ-1] = 0;
372 colon = strchr(devname, ':');
373 if (colon)
374 *colon = 0;
375 dev = __dev_get_by_name(net, devname);
376 if (!dev)
377 return -ENODEV;
378 cfg->fc_oif = dev->ifindex;
379 if (colon) {
380 struct in_ifaddr *ifa;
381 struct in_device *in_dev = __in_dev_get_rtnl(dev);
382 if (!in_dev)
383 return -ENODEV;
384 *colon = ':';
385 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next)
386 if (strcmp(ifa->ifa_label, devname) == 0)
387 break;
388 if (ifa == NULL)
389 return -ENODEV;
390 cfg->fc_prefsrc = ifa->ifa_local;
391 }
392 }
393
394 addr = sk_extract_addr(&rt->rt_gateway);
395 if (rt->rt_gateway.sa_family == AF_INET && addr) {
396 cfg->fc_gw = addr;
397 if (rt->rt_flags & RTF_GATEWAY &&
398 inet_addr_type(net, addr) == RTN_UNICAST)
399 cfg->fc_scope = RT_SCOPE_UNIVERSE;
400 }
401
402 if (cmd == SIOCDELRT)
403 return 0;
404
405 if (rt->rt_flags & RTF_GATEWAY && !cfg->fc_gw)
406 return -EINVAL;
407
408 if (cfg->fc_scope == RT_SCOPE_NOWHERE)
409 cfg->fc_scope = RT_SCOPE_LINK;
410
411 if (rt->rt_flags & (RTF_MTU | RTF_WINDOW | RTF_IRTT)) {
412 struct nlattr *mx;
413 int len = 0;
414
415 mx = kzalloc(3 * nla_total_size(4), GFP_KERNEL);
416 if (mx == NULL)
417 return -ENOMEM;
418
419 if (rt->rt_flags & RTF_MTU)
420 len = put_rtax(mx, len, RTAX_ADVMSS, rt->rt_mtu - 40);
421
422 if (rt->rt_flags & RTF_WINDOW)
423 len = put_rtax(mx, len, RTAX_WINDOW, rt->rt_window);
424
425 if (rt->rt_flags & RTF_IRTT)
426 len = put_rtax(mx, len, RTAX_RTT, rt->rt_irtt << 3);
427
428 cfg->fc_mx = mx;
429 cfg->fc_mx_len = len;
430 }
431
432 return 0;
433 }
434
435 /*
436 * Handle IP routing ioctl calls. These are used to manipulate the routing tables
437 */
438
439 int ip_rt_ioctl(struct net *net, unsigned int cmd, void __user *arg)
440 {
441 struct fib_config cfg;
442 struct rtentry rt;
443 int err;
444
445 switch (cmd) {
446 case SIOCADDRT: /* Add a route */
447 case SIOCDELRT: /* Delete a route */
448 if (!capable(CAP_NET_ADMIN))
449 return -EPERM;
450
451 if (copy_from_user(&rt, arg, sizeof(rt)))
452 return -EFAULT;
453
454 rtnl_lock();
455 err = rtentry_to_fib_config(net, cmd, &rt, &cfg);
456 if (err == 0) {
457 struct fib_table *tb;
458
459 if (cmd == SIOCDELRT) {
460 tb = fib_get_table(net, cfg.fc_table);
461 if (tb)
462 err = tb->tb_delete(tb, &cfg);
463 else
464 err = -ESRCH;
465 } else {
466 tb = fib_new_table(net, cfg.fc_table);
467 if (tb)
468 err = tb->tb_insert(tb, &cfg);
469 else
470 err = -ENOBUFS;
471 }
472
473 /* allocated by rtentry_to_fib_config() */
474 kfree(cfg.fc_mx);
475 }
476 rtnl_unlock();
477 return err;
478 }
479 return -EINVAL;
480 }
481
482 const struct nla_policy rtm_ipv4_policy[RTA_MAX+1] = {
483 [RTA_DST] = { .type = NLA_U32 },
484 [RTA_SRC] = { .type = NLA_U32 },
485 [RTA_IIF] = { .type = NLA_U32 },
486 [RTA_OIF] = { .type = NLA_U32 },
487 [RTA_GATEWAY] = { .type = NLA_U32 },
488 [RTA_PRIORITY] = { .type = NLA_U32 },
489 [RTA_PREFSRC] = { .type = NLA_U32 },
490 [RTA_METRICS] = { .type = NLA_NESTED },
491 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
492 [RTA_PROTOINFO] = { .type = NLA_U32 },
493 [RTA_FLOW] = { .type = NLA_U32 },
494 };
495
496 static int rtm_to_fib_config(struct net *net, struct sk_buff *skb,
497 struct nlmsghdr *nlh, struct fib_config *cfg)
498 {
499 struct nlattr *attr;
500 int err, remaining;
501 struct rtmsg *rtm;
502
503 err = nlmsg_validate(nlh, sizeof(*rtm), RTA_MAX, rtm_ipv4_policy);
504 if (err < 0)
505 goto errout;
506
507 memset(cfg, 0, sizeof(*cfg));
508
509 rtm = nlmsg_data(nlh);
510 cfg->fc_dst_len = rtm->rtm_dst_len;
511 cfg->fc_tos = rtm->rtm_tos;
512 cfg->fc_table = rtm->rtm_table;
513 cfg->fc_protocol = rtm->rtm_protocol;
514 cfg->fc_scope = rtm->rtm_scope;
515 cfg->fc_type = rtm->rtm_type;
516 cfg->fc_flags = rtm->rtm_flags;
517 cfg->fc_nlflags = nlh->nlmsg_flags;
518
519 cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid;
520 cfg->fc_nlinfo.nlh = nlh;
521 cfg->fc_nlinfo.nl_net = net;
522
523 if (cfg->fc_type > RTN_MAX) {
524 err = -EINVAL;
525 goto errout;
526 }
527
528 nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), remaining) {
529 switch (nla_type(attr)) {
530 case RTA_DST:
531 cfg->fc_dst = nla_get_be32(attr);
532 break;
533 case RTA_OIF:
534 cfg->fc_oif = nla_get_u32(attr);
535 break;
536 case RTA_GATEWAY:
537 cfg->fc_gw = nla_get_be32(attr);
538 break;
539 case RTA_PRIORITY:
540 cfg->fc_priority = nla_get_u32(attr);
541 break;
542 case RTA_PREFSRC:
543 cfg->fc_prefsrc = nla_get_be32(attr);
544 break;
545 case RTA_METRICS:
546 cfg->fc_mx = nla_data(attr);
547 cfg->fc_mx_len = nla_len(attr);
548 break;
549 case RTA_MULTIPATH:
550 cfg->fc_mp = nla_data(attr);
551 cfg->fc_mp_len = nla_len(attr);
552 break;
553 case RTA_FLOW:
554 cfg->fc_flow = nla_get_u32(attr);
555 break;
556 case RTA_TABLE:
557 cfg->fc_table = nla_get_u32(attr);
558 break;
559 }
560 }
561
562 return 0;
563 errout:
564 return err;
565 }
566
567 static int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
568 {
569 struct net *net = skb->sk->sk_net;
570 struct fib_config cfg;
571 struct fib_table *tb;
572 int err;
573
574 err = rtm_to_fib_config(net, skb, nlh, &cfg);
575 if (err < 0)
576 goto errout;
577
578 tb = fib_get_table(net, cfg.fc_table);
579 if (tb == NULL) {
580 err = -ESRCH;
581 goto errout;
582 }
583
584 err = tb->tb_delete(tb, &cfg);
585 errout:
586 return err;
587 }
588
589 static int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
590 {
591 struct net *net = skb->sk->sk_net;
592 struct fib_config cfg;
593 struct fib_table *tb;
594 int err;
595
596 err = rtm_to_fib_config(net, skb, nlh, &cfg);
597 if (err < 0)
598 goto errout;
599
600 tb = fib_new_table(net, cfg.fc_table);
601 if (tb == NULL) {
602 err = -ENOBUFS;
603 goto errout;
604 }
605
606 err = tb->tb_insert(tb, &cfg);
607 errout:
608 return err;
609 }
610
611 static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb)
612 {
613 struct net *net = skb->sk->sk_net;
614 unsigned int h, s_h;
615 unsigned int e = 0, s_e;
616 struct fib_table *tb;
617 struct hlist_node *node;
618 struct hlist_head *head;
619 int dumped = 0;
620
621 if (nlmsg_len(cb->nlh) >= sizeof(struct rtmsg) &&
622 ((struct rtmsg *) nlmsg_data(cb->nlh))->rtm_flags & RTM_F_CLONED)
623 return ip_rt_dump(skb, cb);
624
625 s_h = cb->args[0];
626 s_e = cb->args[1];
627
628 for (h = s_h; h < FIB_TABLE_HASHSZ; h++, s_e = 0) {
629 e = 0;
630 head = &net->ipv4.fib_table_hash[h];
631 hlist_for_each_entry(tb, node, head, tb_hlist) {
632 if (e < s_e)
633 goto next;
634 if (dumped)
635 memset(&cb->args[2], 0, sizeof(cb->args) -
636 2 * sizeof(cb->args[0]));
637 if (tb->tb_dump(tb, skb, cb) < 0)
638 goto out;
639 dumped = 1;
640 next:
641 e++;
642 }
643 }
644 out:
645 cb->args[1] = e;
646 cb->args[0] = h;
647
648 return skb->len;
649 }
650
651 /* Prepare and feed intra-kernel routing request.
652 Really, it should be netlink message, but :-( netlink
653 can be not configured, so that we feed it directly
654 to fib engine. It is legal, because all events occur
655 only when netlink is already locked.
656 */
657
658 static void fib_magic(int cmd, int type, __be32 dst, int dst_len, struct in_ifaddr *ifa)
659 {
660 struct net *net = ifa->ifa_dev->dev->nd_net;
661 struct fib_table *tb;
662 struct fib_config cfg = {
663 .fc_protocol = RTPROT_KERNEL,
664 .fc_type = type,
665 .fc_dst = dst,
666 .fc_dst_len = dst_len,
667 .fc_prefsrc = ifa->ifa_local,
668 .fc_oif = ifa->ifa_dev->dev->ifindex,
669 .fc_nlflags = NLM_F_CREATE | NLM_F_APPEND,
670 .fc_nlinfo = {
671 .nl_net = net,
672 },
673 };
674
675 if (type == RTN_UNICAST)
676 tb = fib_new_table(net, RT_TABLE_MAIN);
677 else
678 tb = fib_new_table(net, RT_TABLE_LOCAL);
679
680 if (tb == NULL)
681 return;
682
683 cfg.fc_table = tb->tb_id;
684
685 if (type != RTN_LOCAL)
686 cfg.fc_scope = RT_SCOPE_LINK;
687 else
688 cfg.fc_scope = RT_SCOPE_HOST;
689
690 if (cmd == RTM_NEWROUTE)
691 tb->tb_insert(tb, &cfg);
692 else
693 tb->tb_delete(tb, &cfg);
694 }
695
696 void fib_add_ifaddr(struct in_ifaddr *ifa)
697 {
698 struct in_device *in_dev = ifa->ifa_dev;
699 struct net_device *dev = in_dev->dev;
700 struct in_ifaddr *prim = ifa;
701 __be32 mask = ifa->ifa_mask;
702 __be32 addr = ifa->ifa_local;
703 __be32 prefix = ifa->ifa_address&mask;
704
705 if (ifa->ifa_flags&IFA_F_SECONDARY) {
706 prim = inet_ifa_byprefix(in_dev, prefix, mask);
707 if (prim == NULL) {
708 printk(KERN_WARNING "fib_add_ifaddr: bug: prim == NULL\n");
709 return;
710 }
711 }
712
713 fib_magic(RTM_NEWROUTE, RTN_LOCAL, addr, 32, prim);
714
715 if (!(dev->flags&IFF_UP))
716 return;
717
718 /* Add broadcast address, if it is explicitly assigned. */
719 if (ifa->ifa_broadcast && ifa->ifa_broadcast != htonl(0xFFFFFFFF))
720 fib_magic(RTM_NEWROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim);
721
722 if (!ipv4_is_zeronet(prefix) && !(ifa->ifa_flags&IFA_F_SECONDARY) &&
723 (prefix != addr || ifa->ifa_prefixlen < 32)) {
724 fib_magic(RTM_NEWROUTE, dev->flags&IFF_LOOPBACK ? RTN_LOCAL :
725 RTN_UNICAST, prefix, ifa->ifa_prefixlen, prim);
726
727 /* Add network specific broadcasts, when it takes a sense */
728 if (ifa->ifa_prefixlen < 31) {
729 fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix, 32, prim);
730 fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix|~mask, 32, prim);
731 }
732 }
733 }
734
735 static void fib_del_ifaddr(struct in_ifaddr *ifa)
736 {
737 struct in_device *in_dev = ifa->ifa_dev;
738 struct net_device *dev = in_dev->dev;
739 struct in_ifaddr *ifa1;
740 struct in_ifaddr *prim = ifa;
741 __be32 brd = ifa->ifa_address|~ifa->ifa_mask;
742 __be32 any = ifa->ifa_address&ifa->ifa_mask;
743 #define LOCAL_OK 1
744 #define BRD_OK 2
745 #define BRD0_OK 4
746 #define BRD1_OK 8
747 unsigned ok = 0;
748
749 if (!(ifa->ifa_flags&IFA_F_SECONDARY))
750 fib_magic(RTM_DELROUTE, dev->flags&IFF_LOOPBACK ? RTN_LOCAL :
751 RTN_UNICAST, any, ifa->ifa_prefixlen, prim);
752 else {
753 prim = inet_ifa_byprefix(in_dev, any, ifa->ifa_mask);
754 if (prim == NULL) {
755 printk(KERN_WARNING "fib_del_ifaddr: bug: prim == NULL\n");
756 return;
757 }
758 }
759
760 /* Deletion is more complicated than add.
761 We should take care of not to delete too much :-)
762
763 Scan address list to be sure that addresses are really gone.
764 */
765
766 for (ifa1 = in_dev->ifa_list; ifa1; ifa1 = ifa1->ifa_next) {
767 if (ifa->ifa_local == ifa1->ifa_local)
768 ok |= LOCAL_OK;
769 if (ifa->ifa_broadcast == ifa1->ifa_broadcast)
770 ok |= BRD_OK;
771 if (brd == ifa1->ifa_broadcast)
772 ok |= BRD1_OK;
773 if (any == ifa1->ifa_broadcast)
774 ok |= BRD0_OK;
775 }
776
777 if (!(ok&BRD_OK))
778 fib_magic(RTM_DELROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim);
779 if (!(ok&BRD1_OK))
780 fib_magic(RTM_DELROUTE, RTN_BROADCAST, brd, 32, prim);
781 if (!(ok&BRD0_OK))
782 fib_magic(RTM_DELROUTE, RTN_BROADCAST, any, 32, prim);
783 if (!(ok&LOCAL_OK)) {
784 fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 32, prim);
785
786 /* Check, that this local address finally disappeared. */
787 if (inet_addr_type(dev->nd_net, ifa->ifa_local) != RTN_LOCAL) {
788 /* And the last, but not the least thing.
789 We must flush stray FIB entries.
790
791 First of all, we scan fib_info list searching
792 for stray nexthop entries, then ignite fib_flush.
793 */
794 if (fib_sync_down(ifa->ifa_local, NULL, 0))
795 fib_flush(dev->nd_net);
796 }
797 }
798 #undef LOCAL_OK
799 #undef BRD_OK
800 #undef BRD0_OK
801 #undef BRD1_OK
802 }
803
804 static void nl_fib_lookup(struct fib_result_nl *frn, struct fib_table *tb )
805 {
806
807 struct fib_result res;
808 struct flowi fl = { .mark = frn->fl_mark,
809 .nl_u = { .ip4_u = { .daddr = frn->fl_addr,
810 .tos = frn->fl_tos,
811 .scope = frn->fl_scope } } };
812
813 #ifdef CONFIG_IP_MULTIPLE_TABLES
814 res.r = NULL;
815 #endif
816
817 frn->err = -ENOENT;
818 if (tb) {
819 local_bh_disable();
820
821 frn->tb_id = tb->tb_id;
822 frn->err = tb->tb_lookup(tb, &fl, &res);
823
824 if (!frn->err) {
825 frn->prefixlen = res.prefixlen;
826 frn->nh_sel = res.nh_sel;
827 frn->type = res.type;
828 frn->scope = res.scope;
829 fib_res_put(&res);
830 }
831 local_bh_enable();
832 }
833 }
834
835 static void nl_fib_input(struct sk_buff *skb)
836 {
837 struct net *net;
838 struct fib_result_nl *frn;
839 struct nlmsghdr *nlh;
840 struct fib_table *tb;
841 u32 pid;
842
843 net = skb->sk->sk_net;
844 nlh = nlmsg_hdr(skb);
845 if (skb->len < NLMSG_SPACE(0) || skb->len < nlh->nlmsg_len ||
846 nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*frn)))
847 return;
848
849 skb = skb_clone(skb, GFP_KERNEL);
850 if (skb == NULL)
851 return;
852 nlh = nlmsg_hdr(skb);
853
854 frn = (struct fib_result_nl *) NLMSG_DATA(nlh);
855 tb = fib_get_table(net, frn->tb_id_in);
856
857 nl_fib_lookup(frn, tb);
858
859 pid = NETLINK_CB(skb).pid; /* pid of sending process */
860 NETLINK_CB(skb).pid = 0; /* from kernel */
861 NETLINK_CB(skb).dst_group = 0; /* unicast */
862 netlink_unicast(net->ipv4.fibnl, skb, pid, MSG_DONTWAIT);
863 }
864
865 static int nl_fib_lookup_init(struct net *net)
866 {
867 struct sock *sk;
868 sk = netlink_kernel_create(net, NETLINK_FIB_LOOKUP, 0,
869 nl_fib_input, NULL, THIS_MODULE);
870 if (sk == NULL)
871 return -EAFNOSUPPORT;
872 net->ipv4.fibnl = sk;
873 return 0;
874 }
875
876 static void nl_fib_lookup_exit(struct net *net)
877 {
878 netlink_kernel_release(net->ipv4.fibnl);
879 net->ipv4.fibnl = NULL;
880 }
881
882 static void fib_disable_ip(struct net_device *dev, int force)
883 {
884 if (fib_sync_down(0, dev, force))
885 fib_flush(dev->nd_net);
886 rt_cache_flush(0);
887 arp_ifdown(dev);
888 }
889
890 static int fib_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
891 {
892 struct in_ifaddr *ifa = (struct in_ifaddr*)ptr;
893
894 switch (event) {
895 case NETDEV_UP:
896 fib_add_ifaddr(ifa);
897 #ifdef CONFIG_IP_ROUTE_MULTIPATH
898 fib_sync_up(ifa->ifa_dev->dev);
899 #endif
900 rt_cache_flush(-1);
901 break;
902 case NETDEV_DOWN:
903 fib_del_ifaddr(ifa);
904 if (ifa->ifa_dev->ifa_list == NULL) {
905 /* Last address was deleted from this interface.
906 Disable IP.
907 */
908 fib_disable_ip(ifa->ifa_dev->dev, 1);
909 } else {
910 rt_cache_flush(-1);
911 }
912 break;
913 }
914 return NOTIFY_DONE;
915 }
916
917 static int fib_netdev_event(struct notifier_block *this, unsigned long event, void *ptr)
918 {
919 struct net_device *dev = ptr;
920 struct in_device *in_dev = __in_dev_get_rtnl(dev);
921
922 if (event == NETDEV_UNREGISTER) {
923 fib_disable_ip(dev, 2);
924 return NOTIFY_DONE;
925 }
926
927 if (!in_dev)
928 return NOTIFY_DONE;
929
930 switch (event) {
931 case NETDEV_UP:
932 for_ifa(in_dev) {
933 fib_add_ifaddr(ifa);
934 } endfor_ifa(in_dev);
935 #ifdef CONFIG_IP_ROUTE_MULTIPATH
936 fib_sync_up(dev);
937 #endif
938 rt_cache_flush(-1);
939 break;
940 case NETDEV_DOWN:
941 fib_disable_ip(dev, 0);
942 break;
943 case NETDEV_CHANGEMTU:
944 case NETDEV_CHANGE:
945 rt_cache_flush(0);
946 break;
947 }
948 return NOTIFY_DONE;
949 }
950
951 static struct notifier_block fib_inetaddr_notifier = {
952 .notifier_call =fib_inetaddr_event,
953 };
954
955 static struct notifier_block fib_netdev_notifier = {
956 .notifier_call =fib_netdev_event,
957 };
958
959 static int __net_init ip_fib_net_init(struct net *net)
960 {
961 unsigned int i;
962
963 net->ipv4.fib_table_hash = kzalloc(
964 sizeof(struct hlist_head)*FIB_TABLE_HASHSZ, GFP_KERNEL);
965 if (net->ipv4.fib_table_hash == NULL)
966 return -ENOMEM;
967
968 for (i = 0; i < FIB_TABLE_HASHSZ; i++)
969 INIT_HLIST_HEAD(&net->ipv4.fib_table_hash[i]);
970
971 return fib4_rules_init(net);
972 }
973
974 static void __net_exit ip_fib_net_exit(struct net *net)
975 {
976 unsigned int i;
977
978 #ifdef CONFIG_IP_MULTIPLE_TABLES
979 fib4_rules_exit(net);
980 #endif
981
982 for (i = 0; i < FIB_TABLE_HASHSZ; i++) {
983 struct fib_table *tb;
984 struct hlist_head *head;
985 struct hlist_node *node, *tmp;
986
987 head = &net->ipv4.fib_table_hash[i];
988 hlist_for_each_entry_safe(tb, node, tmp, head, tb_hlist) {
989 hlist_del(node);
990 tb->tb_flush(tb);
991 kfree(tb);
992 }
993 }
994 kfree(net->ipv4.fib_table_hash);
995 }
996
997 static int __net_init fib_net_init(struct net *net)
998 {
999 int error;
1000
1001 error = ip_fib_net_init(net);
1002 if (error < 0)
1003 goto out;
1004 error = nl_fib_lookup_init(net);
1005 if (error < 0)
1006 goto out_nlfl;
1007 error = fib_proc_init(net);
1008 if (error < 0)
1009 goto out_proc;
1010 out:
1011 return error;
1012
1013 out_proc:
1014 nl_fib_lookup_exit(net);
1015 out_nlfl:
1016 ip_fib_net_exit(net);
1017 goto out;
1018 }
1019
1020 static void __net_exit fib_net_exit(struct net *net)
1021 {
1022 fib_proc_exit(net);
1023 nl_fib_lookup_exit(net);
1024 ip_fib_net_exit(net);
1025 }
1026
1027 static struct pernet_operations fib_net_ops = {
1028 .init = fib_net_init,
1029 .exit = fib_net_exit,
1030 };
1031
1032 void __init ip_fib_init(void)
1033 {
1034 rtnl_register(PF_INET, RTM_NEWROUTE, inet_rtm_newroute, NULL);
1035 rtnl_register(PF_INET, RTM_DELROUTE, inet_rtm_delroute, NULL);
1036 rtnl_register(PF_INET, RTM_GETROUTE, NULL, inet_dump_fib);
1037
1038 register_pernet_subsys(&fib_net_ops);
1039 register_netdevice_notifier(&fib_netdev_notifier);
1040 register_inetaddr_notifier(&fib_inetaddr_notifier);
1041
1042 fib_hash_init();
1043 }
1044
1045 EXPORT_SYMBOL(inet_addr_type);
1046 EXPORT_SYMBOL(inet_dev_addr_type);
1047 EXPORT_SYMBOL(ip_dev_find);
Linux kernel - Deliverables
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