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CommitLineData
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 <asm/uaccess.h>
18#include <asm/system.h>
19#include <linux/bitops.h>
20#include <linux/capability.h>
21#include <linux/types.h>
22#include <linux/kernel.h>
23#include <linux/mm.h>
24#include <linux/string.h>
25#include <linux/socket.h>
26#include <linux/sockios.h>
27#include <linux/errno.h>
28#include <linux/in.h>
29#include <linux/inet.h>
30#include <linux/inetdevice.h>
31#include <linux/netdevice.h>
32#include <linux/if_addr.h>
33#include <linux/if_arp.h>
34#include <linux/skbuff.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
48#ifndef CONFIG_IP_MULTIPLE_TABLES
49
50static int __net_init fib4_rules_init(struct net *net)
51{
52 struct fib_table *local_table, *main_table;
53
54 local_table = fib_hash_table(RT_TABLE_LOCAL);
55 if (local_table == NULL)
56 return -ENOMEM;
57
58 main_table = fib_hash_table(RT_TABLE_MAIN);
59 if (main_table == NULL)
60 goto fail;
61
62 hlist_add_head_rcu(&local_table->tb_hlist,
63 &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX]);
64 hlist_add_head_rcu(&main_table->tb_hlist,
65 &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX]);
66 return 0;
67
68fail:
69 kfree(local_table);
70 return -ENOMEM;
71}
72#else
73
74struct fib_table *fib_new_table(struct net *net, 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(net, id);
82 if (tb)
83 return tb;
84
85 tb = fib_hash_table(id);
86 if (!tb)
87 return NULL;
88 h = id & (FIB_TABLE_HASHSZ - 1);
89 hlist_add_head_rcu(&tb->tb_hlist, &net->ipv4.fib_table_hash[h]);
90 return tb;
91}
92
93struct fib_table *fib_get_table(struct net *net, u32 id)
94{
95 struct fib_table *tb;
96 struct hlist_node *node;
97 struct hlist_head *head;
98 unsigned int h;
99
100 if (id == 0)
101 id = RT_TABLE_MAIN;
102 h = id & (FIB_TABLE_HASHSZ - 1);
103
104 rcu_read_lock();
105 head = &net->ipv4.fib_table_hash[h];
106 hlist_for_each_entry_rcu(tb, node, head, tb_hlist) {
107 if (tb->tb_id == id) {
108 rcu_read_unlock();
109 return tb;
110 }
111 }
112 rcu_read_unlock();
113 return NULL;
114}
115#endif /* CONFIG_IP_MULTIPLE_TABLES */
116
117void fib_select_default(struct net *net,
118 const struct flowi *flp, struct fib_result *res)
119{
120 struct fib_table *tb;
121 int table = RT_TABLE_MAIN;
122#ifdef CONFIG_IP_MULTIPLE_TABLES
123 if (res->r == NULL || res->r->action != FR_ACT_TO_TBL)
124 return;
125 table = res->r->table;
126#endif
127 tb = fib_get_table(net, table);
128 if (FIB_RES_GW(*res) && FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK)
129 fib_table_select_default(tb, flp, res);
130}
131
132static void fib_flush(struct net *net)
133{
134 int flushed = 0;
135 struct fib_table *tb;
136 struct hlist_node *node;
137 struct hlist_head *head;
138 unsigned int h;
139
140 for (h = 0; h < FIB_TABLE_HASHSZ; h++) {
141 head = &net->ipv4.fib_table_hash[h];
142 hlist_for_each_entry(tb, node, head, tb_hlist)
143 flushed += fib_table_flush(tb);
144 }
145
146 if (flushed)
147 rt_cache_flush(net, -1);
148}
149
150/**
151 * __ip_dev_find - find the first device with a given source address.
152 * @net: the net namespace
153 * @addr: the source address
154 * @devref: if true, take a reference on the found device
155 *
156 * If a caller uses devref=false, it should be protected by RCU, or RTNL
157 */
158struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref)
159{
160 struct flowi fl = {
161 .fl4_dst = addr,
162 .flags = FLOWI_FLAG_MATCH_ANY_IIF
163 };
164 struct fib_result res = { 0 };
165 struct net_device *dev = NULL;
166
167 rcu_read_lock();
168 if (fib_lookup(net, &fl, &res)) {
169 rcu_read_unlock();
170 return NULL;
171 }
172 if (res.type != RTN_LOCAL)
173 goto out;
174 dev = FIB_RES_DEV(res);
175
176 if (dev && devref)
177 dev_hold(dev);
178out:
179 rcu_read_unlock();
180 return dev;
181}
182EXPORT_SYMBOL(__ip_dev_find);
183
184/*
185 * Find address type as if only "dev" was present in the system. If
186 * on_dev is NULL then all interfaces are taken into consideration.
187 */
188static inline unsigned __inet_dev_addr_type(struct net *net,
189 const struct net_device *dev,
190 __be32 addr)
191{
192 struct flowi fl = { .fl4_dst = addr };
193 struct fib_result res;
194 unsigned ret = RTN_BROADCAST;
195 struct fib_table *local_table;
196
197 if (ipv4_is_zeronet(addr) || ipv4_is_lbcast(addr))
198 return RTN_BROADCAST;
199 if (ipv4_is_multicast(addr))
200 return RTN_MULTICAST;
201
202#ifdef CONFIG_IP_MULTIPLE_TABLES
203 res.r = NULL;
204#endif
205
206 local_table = fib_get_table(net, RT_TABLE_LOCAL);
207 if (local_table) {
208 ret = RTN_UNICAST;
209 rcu_read_lock();
210 if (!fib_table_lookup(local_table, &fl, &res, FIB_LOOKUP_NOREF)) {
211 if (!dev || dev == res.fi->fib_dev)
212 ret = res.type;
213 }
214 rcu_read_unlock();
215 }
216 return ret;
217}
218
219unsigned int inet_addr_type(struct net *net, __be32 addr)
220{
221 return __inet_dev_addr_type(net, NULL, addr);
222}
223EXPORT_SYMBOL(inet_addr_type);
224
225unsigned int inet_dev_addr_type(struct net *net, const struct net_device *dev,
226 __be32 addr)
227{
228 return __inet_dev_addr_type(net, dev, addr);
229}
230EXPORT_SYMBOL(inet_dev_addr_type);
231
232/* Given (packet source, input interface) and optional (dst, oif, tos):
233 * - (main) check, that source is valid i.e. not broadcast or our local
234 * address.
235 * - figure out what "logical" interface this packet arrived
236 * and calculate "specific destination" address.
237 * - check, that packet arrived from expected physical interface.
238 * called with rcu_read_lock()
239 */
240int fib_validate_source(__be32 src, __be32 dst, u8 tos, int oif,
241 struct net_device *dev, __be32 *spec_dst,
242 u32 *itag, u32 mark)
243{
244 struct in_device *in_dev;
245 struct flowi fl = {
246 .fl4_dst = src,
247 .fl4_src = dst,
248 .fl4_tos = tos,
249 .mark = mark,
250 .iif = oif
251 };
252 struct fib_result res;
253 int no_addr, rpf, accept_local;
254 bool dev_match;
255 int ret;
256 struct net *net;
257
258 no_addr = rpf = accept_local = 0;
259 in_dev = __in_dev_get_rcu(dev);
260 if (in_dev) {
261 no_addr = in_dev->ifa_list == NULL;
262 rpf = IN_DEV_RPFILTER(in_dev);
263 accept_local = IN_DEV_ACCEPT_LOCAL(in_dev);
264 if (mark && !IN_DEV_SRC_VMARK(in_dev))
265 fl.mark = 0;
266 }
267
268 if (in_dev == NULL)
269 goto e_inval;
270
271 net = dev_net(dev);
272 if (fib_lookup(net, &fl, &res))
273 goto last_resort;
274 if (res.type != RTN_UNICAST) {
275 if (res.type != RTN_LOCAL || !accept_local)
276 goto e_inval;
277 }
278 *spec_dst = FIB_RES_PREFSRC(res);
279 fib_combine_itag(itag, &res);
280 dev_match = false;
281
282#ifdef CONFIG_IP_ROUTE_MULTIPATH
283 for (ret = 0; ret < res.fi->fib_nhs; ret++) {
284 struct fib_nh *nh = &res.fi->fib_nh[ret];
285
286 if (nh->nh_dev == dev) {
287 dev_match = true;
288 break;
289 }
290 }
291#else
292 if (FIB_RES_DEV(res) == dev)
293 dev_match = true;
294#endif
295 if (dev_match) {
296 ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST;
297 return ret;
298 }
299 if (no_addr)
300 goto last_resort;
301 if (rpf == 1)
302 goto e_rpf;
303 fl.oif = dev->ifindex;
304
305 ret = 0;
306 if (fib_lookup(net, &fl, &res) == 0) {
307 if (res.type == RTN_UNICAST) {
308 *spec_dst = FIB_RES_PREFSRC(res);
309 ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST;
310 }
311 }
312 return ret;
313
314last_resort:
315 if (rpf)
316 goto e_rpf;
317 *spec_dst = inet_select_addr(dev, 0, RT_SCOPE_UNIVERSE);
318 *itag = 0;
319 return 0;
320
321e_inval:
322 return -EINVAL;
323e_rpf:
324 return -EXDEV;
325}
326
327static inline __be32 sk_extract_addr(struct sockaddr *addr)
328{
329 return ((struct sockaddr_in *) addr)->sin_addr.s_addr;
330}
331
332static int put_rtax(struct nlattr *mx, int len, int type, u32 value)
333{
334 struct nlattr *nla;
335
336 nla = (struct nlattr *) ((char *) mx + len);
337 nla->nla_type = type;
338 nla->nla_len = nla_attr_size(4);
339 *(u32 *) nla_data(nla) = value;
340
341 return len + nla_total_size(4);
342}
343
344static int rtentry_to_fib_config(struct net *net, int cmd, struct rtentry *rt,
345 struct fib_config *cfg)
346{
347 __be32 addr;
348 int plen;
349
350 memset(cfg, 0, sizeof(*cfg));
351 cfg->fc_nlinfo.nl_net = net;
352
353 if (rt->rt_dst.sa_family != AF_INET)
354 return -EAFNOSUPPORT;
355
356 /*
357 * Check mask for validity:
358 * a) it must be contiguous.
359 * b) destination must have all host bits clear.
360 * c) if application forgot to set correct family (AF_INET),
361 * reject request unless it is absolutely clear i.e.
362 * both family and mask are zero.
363 */
364 plen = 32;
365 addr = sk_extract_addr(&rt->rt_dst);
366 if (!(rt->rt_flags & RTF_HOST)) {
367 __be32 mask = sk_extract_addr(&rt->rt_genmask);
368
369 if (rt->rt_genmask.sa_family != AF_INET) {
370 if (mask || rt->rt_genmask.sa_family)
371 return -EAFNOSUPPORT;
372 }
373
374 if (bad_mask(mask, addr))
375 return -EINVAL;
376
377 plen = inet_mask_len(mask);
378 }
379
380 cfg->fc_dst_len = plen;
381 cfg->fc_dst = addr;
382
383 if (cmd != SIOCDELRT) {
384 cfg->fc_nlflags = NLM_F_CREATE;
385 cfg->fc_protocol = RTPROT_BOOT;
386 }
387
388 if (rt->rt_metric)
389 cfg->fc_priority = rt->rt_metric - 1;
390
391 if (rt->rt_flags & RTF_REJECT) {
392 cfg->fc_scope = RT_SCOPE_HOST;
393 cfg->fc_type = RTN_UNREACHABLE;
394 return 0;
395 }
396
397 cfg->fc_scope = RT_SCOPE_NOWHERE;
398 cfg->fc_type = RTN_UNICAST;
399
400 if (rt->rt_dev) {
401 char *colon;
402 struct net_device *dev;
403 char devname[IFNAMSIZ];
404
405 if (copy_from_user(devname, rt->rt_dev, IFNAMSIZ-1))
406 return -EFAULT;
407
408 devname[IFNAMSIZ-1] = 0;
409 colon = strchr(devname, ':');
410 if (colon)
411 *colon = 0;
412 dev = __dev_get_by_name(net, devname);
413 if (!dev)
414 return -ENODEV;
415 cfg->fc_oif = dev->ifindex;
416 if (colon) {
417 struct in_ifaddr *ifa;
418 struct in_device *in_dev = __in_dev_get_rtnl(dev);
419 if (!in_dev)
420 return -ENODEV;
421 *colon = ':';
422 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next)
423 if (strcmp(ifa->ifa_label, devname) == 0)
424 break;
425 if (ifa == NULL)
426 return -ENODEV;
427 cfg->fc_prefsrc = ifa->ifa_local;
428 }
429 }
430
431 addr = sk_extract_addr(&rt->rt_gateway);
432 if (rt->rt_gateway.sa_family == AF_INET && addr) {
433 cfg->fc_gw = addr;
434 if (rt->rt_flags & RTF_GATEWAY &&
435 inet_addr_type(net, addr) == RTN_UNICAST)
436 cfg->fc_scope = RT_SCOPE_UNIVERSE;
437 }
438
439 if (cmd == SIOCDELRT)
440 return 0;
441
442 if (rt->rt_flags & RTF_GATEWAY && !cfg->fc_gw)
443 return -EINVAL;
444
445 if (cfg->fc_scope == RT_SCOPE_NOWHERE)
446 cfg->fc_scope = RT_SCOPE_LINK;
447
448 if (rt->rt_flags & (RTF_MTU | RTF_WINDOW | RTF_IRTT)) {
449 struct nlattr *mx;
450 int len = 0;
451
452 mx = kzalloc(3 * nla_total_size(4), GFP_KERNEL);
453 if (mx == NULL)
454 return -ENOMEM;
455
456 if (rt->rt_flags & RTF_MTU)
457 len = put_rtax(mx, len, RTAX_ADVMSS, rt->rt_mtu - 40);
458
459 if (rt->rt_flags & RTF_WINDOW)
460 len = put_rtax(mx, len, RTAX_WINDOW, rt->rt_window);
461
462 if (rt->rt_flags & RTF_IRTT)
463 len = put_rtax(mx, len, RTAX_RTT, rt->rt_irtt << 3);
464
465 cfg->fc_mx = mx;
466 cfg->fc_mx_len = len;
467 }
468
469 return 0;
470}
471
472/*
473 * Handle IP routing ioctl calls.
474 * These are used to manipulate the routing tables
475 */
476int ip_rt_ioctl(struct net *net, unsigned int cmd, void __user *arg)
477{
478 struct fib_config cfg;
479 struct rtentry rt;
480 int err;
481
482 switch (cmd) {
483 case SIOCADDRT: /* Add a route */
484 case SIOCDELRT: /* Delete a route */
485 if (!capable(CAP_NET_ADMIN))
486 return -EPERM;
487
488 if (copy_from_user(&rt, arg, sizeof(rt)))
489 return -EFAULT;
490
491 rtnl_lock();
492 err = rtentry_to_fib_config(net, cmd, &rt, &cfg);
493 if (err == 0) {
494 struct fib_table *tb;
495
496 if (cmd == SIOCDELRT) {
497 tb = fib_get_table(net, cfg.fc_table);
498 if (tb)
499 err = fib_table_delete(tb, &cfg);
500 else
501 err = -ESRCH;
502 } else {
503 tb = fib_new_table(net, cfg.fc_table);
504 if (tb)
505 err = fib_table_insert(tb, &cfg);
506 else
507 err = -ENOBUFS;
508 }
509
510 /* allocated by rtentry_to_fib_config() */
511 kfree(cfg.fc_mx);
512 }
513 rtnl_unlock();
514 return err;
515 }
516 return -EINVAL;
517}
518
519const struct nla_policy rtm_ipv4_policy[RTA_MAX + 1] = {
520 [RTA_DST] = { .type = NLA_U32 },
521 [RTA_SRC] = { .type = NLA_U32 },
522 [RTA_IIF] = { .type = NLA_U32 },
523 [RTA_OIF] = { .type = NLA_U32 },
524 [RTA_GATEWAY] = { .type = NLA_U32 },
525 [RTA_PRIORITY] = { .type = NLA_U32 },
526 [RTA_PREFSRC] = { .type = NLA_U32 },
527 [RTA_METRICS] = { .type = NLA_NESTED },
528 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
529 [RTA_FLOW] = { .type = NLA_U32 },
530};
531
532static int rtm_to_fib_config(struct net *net, struct sk_buff *skb,
533 struct nlmsghdr *nlh, struct fib_config *cfg)
534{
535 struct nlattr *attr;
536 int err, remaining;
537 struct rtmsg *rtm;
538
539 err = nlmsg_validate(nlh, sizeof(*rtm), RTA_MAX, rtm_ipv4_policy);
540 if (err < 0)
541 goto errout;
542
543 memset(cfg, 0, sizeof(*cfg));
544
545 rtm = nlmsg_data(nlh);
546 cfg->fc_dst_len = rtm->rtm_dst_len;
547 cfg->fc_tos = rtm->rtm_tos;
548 cfg->fc_table = rtm->rtm_table;
549 cfg->fc_protocol = rtm->rtm_protocol;
550 cfg->fc_scope = rtm->rtm_scope;
551 cfg->fc_type = rtm->rtm_type;
552 cfg->fc_flags = rtm->rtm_flags;
553 cfg->fc_nlflags = nlh->nlmsg_flags;
554
555 cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid;
556 cfg->fc_nlinfo.nlh = nlh;
557 cfg->fc_nlinfo.nl_net = net;
558
559 if (cfg->fc_type > RTN_MAX) {
560 err = -EINVAL;
561 goto errout;
562 }
563
564 nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), remaining) {
565 switch (nla_type(attr)) {
566 case RTA_DST:
567 cfg->fc_dst = nla_get_be32(attr);
568 break;
569 case RTA_OIF:
570 cfg->fc_oif = nla_get_u32(attr);
571 break;
572 case RTA_GATEWAY:
573 cfg->fc_gw = nla_get_be32(attr);
574 break;
575 case RTA_PRIORITY:
576 cfg->fc_priority = nla_get_u32(attr);
577 break;
578 case RTA_PREFSRC:
579 cfg->fc_prefsrc = nla_get_be32(attr);
580 break;
581 case RTA_METRICS:
582 cfg->fc_mx = nla_data(attr);
583 cfg->fc_mx_len = nla_len(attr);
584 break;
585 case RTA_MULTIPATH:
586 cfg->fc_mp = nla_data(attr);
587 cfg->fc_mp_len = nla_len(attr);
588 break;
589 case RTA_FLOW:
590 cfg->fc_flow = nla_get_u32(attr);
591 break;
592 case RTA_TABLE:
593 cfg->fc_table = nla_get_u32(attr);
594 break;
595 }
596 }
597
598 return 0;
599errout:
600 return err;
601}
602
603static int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
604{
605 struct net *net = sock_net(skb->sk);
606 struct fib_config cfg;
607 struct fib_table *tb;
608 int err;
609
610 err = rtm_to_fib_config(net, skb, nlh, &cfg);
611 if (err < 0)
612 goto errout;
613
614 tb = fib_get_table(net, cfg.fc_table);
615 if (tb == NULL) {
616 err = -ESRCH;
617 goto errout;
618 }
619
620 err = fib_table_delete(tb, &cfg);
621errout:
622 return err;
623}
624
625static int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
626{
627 struct net *net = sock_net(skb->sk);
628 struct fib_config cfg;
629 struct fib_table *tb;
630 int err;
631
632 err = rtm_to_fib_config(net, skb, nlh, &cfg);
633 if (err < 0)
634 goto errout;
635
636 tb = fib_new_table(net, cfg.fc_table);
637 if (tb == NULL) {
638 err = -ENOBUFS;
639 goto errout;
640 }
641
642 err = fib_table_insert(tb, &cfg);
643errout:
644 return err;
645}
646
647static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb)
648{
649 struct net *net = sock_net(skb->sk);
650 unsigned int h, s_h;
651 unsigned int e = 0, s_e;
652 struct fib_table *tb;
653 struct hlist_node *node;
654 struct hlist_head *head;
655 int dumped = 0;
656
657 if (nlmsg_len(cb->nlh) >= sizeof(struct rtmsg) &&
658 ((struct rtmsg *) nlmsg_data(cb->nlh))->rtm_flags & RTM_F_CLONED)
659 return ip_rt_dump(skb, cb);
660
661 s_h = cb->args[0];
662 s_e = cb->args[1];
663
664 for (h = s_h; h < FIB_TABLE_HASHSZ; h++, s_e = 0) {
665 e = 0;
666 head = &net->ipv4.fib_table_hash[h];
667 hlist_for_each_entry(tb, node, head, tb_hlist) {
668 if (e < s_e)
669 goto next;
670 if (dumped)
671 memset(&cb->args[2], 0, sizeof(cb->args) -
672 2 * sizeof(cb->args[0]));
673 if (fib_table_dump(tb, skb, cb) < 0)
674 goto out;
675 dumped = 1;
676next:
677 e++;
678 }
679 }
680out:
681 cb->args[1] = e;
682 cb->args[0] = h;
683
684 return skb->len;
685}
686
687/* Prepare and feed intra-kernel routing request.
688 * Really, it should be netlink message, but :-( netlink
689 * can be not configured, so that we feed it directly
690 * to fib engine. It is legal, because all events occur
691 * only when netlink is already locked.
692 */
693static void fib_magic(int cmd, int type, __be32 dst, int dst_len, struct in_ifaddr *ifa)
694{
695 struct net *net = dev_net(ifa->ifa_dev->dev);
696 struct fib_table *tb;
697 struct fib_config cfg = {
698 .fc_protocol = RTPROT_KERNEL,
699 .fc_type = type,
700 .fc_dst = dst,
701 .fc_dst_len = dst_len,
702 .fc_prefsrc = ifa->ifa_local,
703 .fc_oif = ifa->ifa_dev->dev->ifindex,
704 .fc_nlflags = NLM_F_CREATE | NLM_F_APPEND,
705 .fc_nlinfo = {
706 .nl_net = net,
707 },
708 };
709
710 if (type == RTN_UNICAST)
711 tb = fib_new_table(net, RT_TABLE_MAIN);
712 else
713 tb = fib_new_table(net, RT_TABLE_LOCAL);
714
715 if (tb == NULL)
716 return;
717
718 cfg.fc_table = tb->tb_id;
719
720 if (type != RTN_LOCAL)
721 cfg.fc_scope = RT_SCOPE_LINK;
722 else
723 cfg.fc_scope = RT_SCOPE_HOST;
724
725 if (cmd == RTM_NEWROUTE)
726 fib_table_insert(tb, &cfg);
727 else
728 fib_table_delete(tb, &cfg);
729}
730
731void fib_add_ifaddr(struct in_ifaddr *ifa)
732{
733 struct in_device *in_dev = ifa->ifa_dev;
734 struct net_device *dev = in_dev->dev;
735 struct in_ifaddr *prim = ifa;
736 __be32 mask = ifa->ifa_mask;
737 __be32 addr = ifa->ifa_local;
738 __be32 prefix = ifa->ifa_address & mask;
739
740 if (ifa->ifa_flags & IFA_F_SECONDARY) {
741 prim = inet_ifa_byprefix(in_dev, prefix, mask);
742 if (prim == NULL) {
743 printk(KERN_WARNING "fib_add_ifaddr: bug: prim == NULL\n");
744 return;
745 }
746 }
747
748 fib_magic(RTM_NEWROUTE, RTN_LOCAL, addr, 32, prim);
749
750 if (!(dev->flags & IFF_UP))
751 return;
752
753 /* Add broadcast address, if it is explicitly assigned. */
754 if (ifa->ifa_broadcast && ifa->ifa_broadcast != htonl(0xFFFFFFFF))
755 fib_magic(RTM_NEWROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim);
756
757 if (!ipv4_is_zeronet(prefix) && !(ifa->ifa_flags & IFA_F_SECONDARY) &&
758 (prefix != addr || ifa->ifa_prefixlen < 32)) {
759 fib_magic(RTM_NEWROUTE,
760 dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST,
761 prefix, ifa->ifa_prefixlen, prim);
762
763 /* Add network specific broadcasts, when it takes a sense */
764 if (ifa->ifa_prefixlen < 31) {
765 fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix, 32, prim);
766 fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix | ~mask,
767 32, prim);
768 }
769 }
770}
771
772static void fib_del_ifaddr(struct in_ifaddr *ifa)
773{
774 struct in_device *in_dev = ifa->ifa_dev;
775 struct net_device *dev = in_dev->dev;
776 struct in_ifaddr *ifa1;
777 struct in_ifaddr *prim = ifa;
778 __be32 brd = ifa->ifa_address | ~ifa->ifa_mask;
779 __be32 any = ifa->ifa_address & ifa->ifa_mask;
780#define LOCAL_OK 1
781#define BRD_OK 2
782#define BRD0_OK 4
783#define BRD1_OK 8
784 unsigned ok = 0;
785
786 if (!(ifa->ifa_flags & IFA_F_SECONDARY))
787 fib_magic(RTM_DELROUTE,
788 dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST,
789 any, ifa->ifa_prefixlen, prim);
790 else {
791 prim = inet_ifa_byprefix(in_dev, any, ifa->ifa_mask);
792 if (prim == NULL) {
793 printk(KERN_WARNING "fib_del_ifaddr: bug: prim == NULL\n");
794 return;
795 }
796 }
797
798 /* Deletion is more complicated than add.
799 * We should take care of not to delete too much :-)
800 *
801 * Scan address list to be sure that addresses are really gone.
802 */
803
804 for (ifa1 = in_dev->ifa_list; ifa1; ifa1 = ifa1->ifa_next) {
805 if (ifa->ifa_local == ifa1->ifa_local)
806 ok |= LOCAL_OK;
807 if (ifa->ifa_broadcast == ifa1->ifa_broadcast)
808 ok |= BRD_OK;
809 if (brd == ifa1->ifa_broadcast)
810 ok |= BRD1_OK;
811 if (any == ifa1->ifa_broadcast)
812 ok |= BRD0_OK;
813 }
814
815 if (!(ok & BRD_OK))
816 fib_magic(RTM_DELROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim);
817 if (!(ok & BRD1_OK))
818 fib_magic(RTM_DELROUTE, RTN_BROADCAST, brd, 32, prim);
819 if (!(ok & BRD0_OK))
820 fib_magic(RTM_DELROUTE, RTN_BROADCAST, any, 32, prim);
821 if (!(ok & LOCAL_OK)) {
822 fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 32, prim);
823
824 /* Check, that this local address finally disappeared. */
825 if (inet_addr_type(dev_net(dev), ifa->ifa_local) != RTN_LOCAL) {
826 /* And the last, but not the least thing.
827 * We must flush stray FIB entries.
828 *
829 * First of all, we scan fib_info list searching
830 * for stray nexthop entries, then ignite fib_flush.
831 */
832 if (fib_sync_down_addr(dev_net(dev), ifa->ifa_local))
833 fib_flush(dev_net(dev));
834 }
835 }
836#undef LOCAL_OK
837#undef BRD_OK
838#undef BRD0_OK
839#undef BRD1_OK
840}
841
842static void nl_fib_lookup(struct fib_result_nl *frn, struct fib_table *tb)
843{
844
845 struct fib_result res;
846 struct flowi fl = {
847 .mark = frn->fl_mark,
848 .fl4_dst = frn->fl_addr,
849 .fl4_tos = frn->fl_tos,
850 .fl4_scope = frn->fl_scope,
851 };
852
853#ifdef CONFIG_IP_MULTIPLE_TABLES
854 res.r = NULL;
855#endif
856
857 frn->err = -ENOENT;
858 if (tb) {
859 local_bh_disable();
860
861 frn->tb_id = tb->tb_id;
862 rcu_read_lock();
863 frn->err = fib_table_lookup(tb, &fl, &res, FIB_LOOKUP_NOREF);
864
865 if (!frn->err) {
866 frn->prefixlen = res.prefixlen;
867 frn->nh_sel = res.nh_sel;
868 frn->type = res.type;
869 frn->scope = res.scope;
870 }
871 rcu_read_unlock();
872 local_bh_enable();
873 }
874}
875
876static void nl_fib_input(struct sk_buff *skb)
877{
878 struct net *net;
879 struct fib_result_nl *frn;
880 struct nlmsghdr *nlh;
881 struct fib_table *tb;
882 u32 pid;
883
884 net = sock_net(skb->sk);
885 nlh = nlmsg_hdr(skb);
886 if (skb->len < NLMSG_SPACE(0) || skb->len < nlh->nlmsg_len ||
887 nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*frn)))
888 return;
889
890 skb = skb_clone(skb, GFP_KERNEL);
891 if (skb == NULL)
892 return;
893 nlh = nlmsg_hdr(skb);
894
895 frn = (struct fib_result_nl *) NLMSG_DATA(nlh);
896 tb = fib_get_table(net, frn->tb_id_in);
897
898 nl_fib_lookup(frn, tb);
899
900 pid = NETLINK_CB(skb).pid; /* pid of sending process */
901 NETLINK_CB(skb).pid = 0; /* from kernel */
902 NETLINK_CB(skb).dst_group = 0; /* unicast */
903 netlink_unicast(net->ipv4.fibnl, skb, pid, MSG_DONTWAIT);
904}
905
906static int __net_init nl_fib_lookup_init(struct net *net)
907{
908 struct sock *sk;
909 sk = netlink_kernel_create(net, NETLINK_FIB_LOOKUP, 0,
910 nl_fib_input, NULL, THIS_MODULE);
911 if (sk == NULL)
912 return -EAFNOSUPPORT;
913 net->ipv4.fibnl = sk;
914 return 0;
915}
916
917static void nl_fib_lookup_exit(struct net *net)
918{
919 netlink_kernel_release(net->ipv4.fibnl);
920 net->ipv4.fibnl = NULL;
921}
922
923static void fib_disable_ip(struct net_device *dev, int force, int delay)
924{
925 if (fib_sync_down_dev(dev, force))
926 fib_flush(dev_net(dev));
927 rt_cache_flush(dev_net(dev), delay);
928 arp_ifdown(dev);
929}
930
931static int fib_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
932{
933 struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
934 struct net_device *dev = ifa->ifa_dev->dev;
935
936 switch (event) {
937 case NETDEV_UP:
938 fib_add_ifaddr(ifa);
939#ifdef CONFIG_IP_ROUTE_MULTIPATH
940 fib_sync_up(dev);
941#endif
942 rt_cache_flush(dev_net(dev), -1);
943 break;
944 case NETDEV_DOWN:
945 fib_del_ifaddr(ifa);
946 if (ifa->ifa_dev->ifa_list == NULL) {
947 /* Last address was deleted from this interface.
948 * Disable IP.
949 */
950 fib_disable_ip(dev, 1, 0);
951 } else {
952 rt_cache_flush(dev_net(dev), -1);
953 }
954 break;
955 }
956 return NOTIFY_DONE;
957}
958
959static int fib_netdev_event(struct notifier_block *this, unsigned long event, void *ptr)
960{
961 struct net_device *dev = ptr;
962 struct in_device *in_dev = __in_dev_get_rtnl(dev);
963
964 if (event == NETDEV_UNREGISTER) {
965 fib_disable_ip(dev, 2, -1);
966 return NOTIFY_DONE;
967 }
968
969 if (!in_dev)
970 return NOTIFY_DONE;
971
972 switch (event) {
973 case NETDEV_UP:
974 for_ifa(in_dev) {
975 fib_add_ifaddr(ifa);
976 } endfor_ifa(in_dev);
977#ifdef CONFIG_IP_ROUTE_MULTIPATH
978 fib_sync_up(dev);
979#endif
980 rt_cache_flush(dev_net(dev), -1);
981 break;
982 case NETDEV_DOWN:
983 fib_disable_ip(dev, 0, 0);
984 break;
985 case NETDEV_CHANGEMTU:
986 case NETDEV_CHANGE:
987 rt_cache_flush(dev_net(dev), 0);
988 break;
989 case NETDEV_UNREGISTER_BATCH:
990 rt_cache_flush_batch();
991 break;
992 }
993 return NOTIFY_DONE;
994}
995
996static struct notifier_block fib_inetaddr_notifier = {
997 .notifier_call = fib_inetaddr_event,
998};
999
1000static struct notifier_block fib_netdev_notifier = {
1001 .notifier_call = fib_netdev_event,
1002};
1003
1004static int __net_init ip_fib_net_init(struct net *net)
1005{
1006 int err;
1007 size_t size = sizeof(struct hlist_head) * FIB_TABLE_HASHSZ;
1008
1009 /* Avoid false sharing : Use at least a full cache line */
1010 size = max_t(size_t, size, L1_CACHE_BYTES);
1011
1012 net->ipv4.fib_table_hash = kzalloc(size, GFP_KERNEL);
1013 if (net->ipv4.fib_table_hash == NULL)
1014 return -ENOMEM;
1015
1016 err = fib4_rules_init(net);
1017 if (err < 0)
1018 goto fail;
1019 return 0;
1020
1021fail:
1022 kfree(net->ipv4.fib_table_hash);
1023 return err;
1024}
1025
1026static void ip_fib_net_exit(struct net *net)
1027{
1028 unsigned int i;
1029
1030#ifdef CONFIG_IP_MULTIPLE_TABLES
1031 fib4_rules_exit(net);
1032#endif
1033
1034 for (i = 0; i < FIB_TABLE_HASHSZ; i++) {
1035 struct fib_table *tb;
1036 struct hlist_head *head;
1037 struct hlist_node *node, *tmp;
1038
1039 head = &net->ipv4.fib_table_hash[i];
1040 hlist_for_each_entry_safe(tb, node, tmp, head, tb_hlist) {
1041 hlist_del(node);
1042 fib_table_flush(tb);
1043 fib_free_table(tb);
1044 }
1045 }
1046 kfree(net->ipv4.fib_table_hash);
1047}
1048
1049static int __net_init fib_net_init(struct net *net)
1050{
1051 int error;
1052
1053 error = ip_fib_net_init(net);
1054 if (error < 0)
1055 goto out;
1056 error = nl_fib_lookup_init(net);
1057 if (error < 0)
1058 goto out_nlfl;
1059 error = fib_proc_init(net);
1060 if (error < 0)
1061 goto out_proc;
1062out:
1063 return error;
1064
1065out_proc:
1066 nl_fib_lookup_exit(net);
1067out_nlfl:
1068 ip_fib_net_exit(net);
1069 goto out;
1070}
1071
1072static void __net_exit fib_net_exit(struct net *net)
1073{
1074 fib_proc_exit(net);
1075 nl_fib_lookup_exit(net);
1076 ip_fib_net_exit(net);
1077}
1078
1079static struct pernet_operations fib_net_ops = {
1080 .init = fib_net_init,
1081 .exit = fib_net_exit,
1082};
1083
1084void __init ip_fib_init(void)
1085{
1086 rtnl_register(PF_INET, RTM_NEWROUTE, inet_rtm_newroute, NULL);
1087 rtnl_register(PF_INET, RTM_DELROUTE, inet_rtm_delroute, NULL);
1088 rtnl_register(PF_INET, RTM_GETROUTE, NULL, inet_dump_fib);
1089
1090 register_pernet_subsys(&fib_net_ops);
1091 register_netdevice_notifier(&fib_netdev_notifier);
1092 register_inetaddr_notifier(&fib_inetaddr_notifier);
1093
1094 fib_hash_init();
1095}
Clone of davem's net-next-2.6 tree