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1da177e4 LT |
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/config.h> | |
19 | #include <linux/module.h> | |
20 | #include <asm/uaccess.h> | |
21 | #include <asm/system.h> | |
22 | #include <linux/bitops.h> | |
4fc268d2 | 23 | #include <linux/capability.h> |
1da177e4 LT |
24 | #include <linux/types.h> |
25 | #include <linux/kernel.h> | |
26 | #include <linux/sched.h> | |
27 | #include <linux/mm.h> | |
28 | #include <linux/string.h> | |
29 | #include <linux/socket.h> | |
30 | #include <linux/sockios.h> | |
31 | #include <linux/errno.h> | |
32 | #include <linux/in.h> | |
33 | #include <linux/inet.h> | |
14c85021 | 34 | #include <linux/inetdevice.h> |
1da177e4 LT |
35 | #include <linux/netdevice.h> |
36 | #include <linux/if_arp.h> | |
37 | #include <linux/skbuff.h> | |
38 | #include <linux/netlink.h> | |
39 | #include <linux/init.h> | |
40 | ||
41 | #include <net/ip.h> | |
42 | #include <net/protocol.h> | |
43 | #include <net/route.h> | |
44 | #include <net/tcp.h> | |
45 | #include <net/sock.h> | |
46 | #include <net/icmp.h> | |
47 | #include <net/arp.h> | |
48 | #include <net/ip_fib.h> | |
49 | ||
50 | #define FFprint(a...) printk(KERN_DEBUG a) | |
51 | ||
52 | #ifndef CONFIG_IP_MULTIPLE_TABLES | |
53 | ||
54 | #define RT_TABLE_MIN RT_TABLE_MAIN | |
55 | ||
56 | struct fib_table *ip_fib_local_table; | |
57 | struct fib_table *ip_fib_main_table; | |
58 | ||
59 | #else | |
60 | ||
61 | #define RT_TABLE_MIN 1 | |
62 | ||
63 | struct fib_table *fib_tables[RT_TABLE_MAX+1]; | |
64 | ||
65 | struct fib_table *__fib_new_table(int id) | |
66 | { | |
67 | struct fib_table *tb; | |
68 | ||
69 | tb = fib_hash_init(id); | |
70 | if (!tb) | |
71 | return NULL; | |
72 | fib_tables[id] = tb; | |
73 | return tb; | |
74 | } | |
75 | ||
76 | ||
77 | #endif /* CONFIG_IP_MULTIPLE_TABLES */ | |
78 | ||
79 | ||
80 | static void fib_flush(void) | |
81 | { | |
82 | int flushed = 0; | |
83 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
84 | struct fib_table *tb; | |
85 | int id; | |
86 | ||
87 | for (id = RT_TABLE_MAX; id>0; id--) { | |
88 | if ((tb = fib_get_table(id))==NULL) | |
89 | continue; | |
90 | flushed += tb->tb_flush(tb); | |
91 | } | |
92 | #else /* CONFIG_IP_MULTIPLE_TABLES */ | |
93 | flushed += ip_fib_main_table->tb_flush(ip_fib_main_table); | |
94 | flushed += ip_fib_local_table->tb_flush(ip_fib_local_table); | |
95 | #endif /* CONFIG_IP_MULTIPLE_TABLES */ | |
96 | ||
97 | if (flushed) | |
98 | rt_cache_flush(-1); | |
99 | } | |
100 | ||
101 | /* | |
102 | * Find the first device with a given source address. | |
103 | */ | |
104 | ||
105 | struct net_device * ip_dev_find(u32 addr) | |
106 | { | |
107 | struct flowi fl = { .nl_u = { .ip4_u = { .daddr = addr } } }; | |
108 | struct fib_result res; | |
109 | struct net_device *dev = NULL; | |
110 | ||
111 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
112 | res.r = NULL; | |
113 | #endif | |
114 | ||
115 | if (!ip_fib_local_table || | |
116 | ip_fib_local_table->tb_lookup(ip_fib_local_table, &fl, &res)) | |
117 | return NULL; | |
118 | if (res.type != RTN_LOCAL) | |
119 | goto out; | |
120 | dev = FIB_RES_DEV(res); | |
121 | ||
122 | if (dev) | |
123 | dev_hold(dev); | |
124 | out: | |
125 | fib_res_put(&res); | |
126 | return dev; | |
127 | } | |
128 | ||
129 | unsigned inet_addr_type(u32 addr) | |
130 | { | |
131 | struct flowi fl = { .nl_u = { .ip4_u = { .daddr = addr } } }; | |
132 | struct fib_result res; | |
133 | unsigned ret = RTN_BROADCAST; | |
134 | ||
135 | if (ZERONET(addr) || BADCLASS(addr)) | |
136 | return RTN_BROADCAST; | |
137 | if (MULTICAST(addr)) | |
138 | return RTN_MULTICAST; | |
139 | ||
140 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
141 | res.r = NULL; | |
142 | #endif | |
143 | ||
144 | if (ip_fib_local_table) { | |
145 | ret = RTN_UNICAST; | |
146 | if (!ip_fib_local_table->tb_lookup(ip_fib_local_table, | |
147 | &fl, &res)) { | |
148 | ret = res.type; | |
149 | fib_res_put(&res); | |
150 | } | |
151 | } | |
152 | return ret; | |
153 | } | |
154 | ||
155 | /* Given (packet source, input interface) and optional (dst, oif, tos): | |
156 | - (main) check, that source is valid i.e. not broadcast or our local | |
157 | address. | |
158 | - figure out what "logical" interface this packet arrived | |
159 | and calculate "specific destination" address. | |
160 | - check, that packet arrived from expected physical interface. | |
161 | */ | |
162 | ||
163 | int fib_validate_source(u32 src, u32 dst, u8 tos, int oif, | |
164 | struct net_device *dev, u32 *spec_dst, u32 *itag) | |
165 | { | |
166 | struct in_device *in_dev; | |
167 | struct flowi fl = { .nl_u = { .ip4_u = | |
168 | { .daddr = src, | |
169 | .saddr = dst, | |
170 | .tos = tos } }, | |
171 | .iif = oif }; | |
172 | struct fib_result res; | |
173 | int no_addr, rpf; | |
174 | int ret; | |
175 | ||
176 | no_addr = rpf = 0; | |
177 | rcu_read_lock(); | |
e5ed6399 | 178 | in_dev = __in_dev_get_rcu(dev); |
1da177e4 LT |
179 | if (in_dev) { |
180 | no_addr = in_dev->ifa_list == NULL; | |
181 | rpf = IN_DEV_RPFILTER(in_dev); | |
182 | } | |
183 | rcu_read_unlock(); | |
184 | ||
185 | if (in_dev == NULL) | |
186 | goto e_inval; | |
187 | ||
188 | if (fib_lookup(&fl, &res)) | |
189 | goto last_resort; | |
190 | if (res.type != RTN_UNICAST) | |
191 | goto e_inval_res; | |
192 | *spec_dst = FIB_RES_PREFSRC(res); | |
193 | fib_combine_itag(itag, &res); | |
194 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
195 | if (FIB_RES_DEV(res) == dev || res.fi->fib_nhs > 1) | |
196 | #else | |
197 | if (FIB_RES_DEV(res) == dev) | |
198 | #endif | |
199 | { | |
200 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; | |
201 | fib_res_put(&res); | |
202 | return ret; | |
203 | } | |
204 | fib_res_put(&res); | |
205 | if (no_addr) | |
206 | goto last_resort; | |
207 | if (rpf) | |
208 | goto e_inval; | |
209 | fl.oif = dev->ifindex; | |
210 | ||
211 | ret = 0; | |
212 | if (fib_lookup(&fl, &res) == 0) { | |
213 | if (res.type == RTN_UNICAST) { | |
214 | *spec_dst = FIB_RES_PREFSRC(res); | |
215 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; | |
216 | } | |
217 | fib_res_put(&res); | |
218 | } | |
219 | return ret; | |
220 | ||
221 | last_resort: | |
222 | if (rpf) | |
223 | goto e_inval; | |
224 | *spec_dst = inet_select_addr(dev, 0, RT_SCOPE_UNIVERSE); | |
225 | *itag = 0; | |
226 | return 0; | |
227 | ||
228 | e_inval_res: | |
229 | fib_res_put(&res); | |
230 | e_inval: | |
231 | return -EINVAL; | |
232 | } | |
233 | ||
234 | #ifndef CONFIG_IP_NOSIOCRT | |
235 | ||
236 | /* | |
237 | * Handle IP routing ioctl calls. These are used to manipulate the routing tables | |
238 | */ | |
239 | ||
240 | int ip_rt_ioctl(unsigned int cmd, void __user *arg) | |
241 | { | |
242 | int err; | |
243 | struct kern_rta rta; | |
244 | struct rtentry r; | |
245 | struct { | |
246 | struct nlmsghdr nlh; | |
247 | struct rtmsg rtm; | |
248 | } req; | |
249 | ||
250 | switch (cmd) { | |
251 | case SIOCADDRT: /* Add a route */ | |
252 | case SIOCDELRT: /* Delete a route */ | |
253 | if (!capable(CAP_NET_ADMIN)) | |
254 | return -EPERM; | |
255 | if (copy_from_user(&r, arg, sizeof(struct rtentry))) | |
256 | return -EFAULT; | |
257 | rtnl_lock(); | |
258 | err = fib_convert_rtentry(cmd, &req.nlh, &req.rtm, &rta, &r); | |
259 | if (err == 0) { | |
260 | if (cmd == SIOCDELRT) { | |
261 | struct fib_table *tb = fib_get_table(req.rtm.rtm_table); | |
262 | err = -ESRCH; | |
263 | if (tb) | |
264 | err = tb->tb_delete(tb, &req.rtm, &rta, &req.nlh, NULL); | |
265 | } else { | |
266 | struct fib_table *tb = fib_new_table(req.rtm.rtm_table); | |
267 | err = -ENOBUFS; | |
268 | if (tb) | |
269 | err = tb->tb_insert(tb, &req.rtm, &rta, &req.nlh, NULL); | |
270 | } | |
a51482bd | 271 | kfree(rta.rta_mx); |
1da177e4 LT |
272 | } |
273 | rtnl_unlock(); | |
274 | return err; | |
275 | } | |
276 | return -EINVAL; | |
277 | } | |
278 | ||
279 | #else | |
280 | ||
281 | int ip_rt_ioctl(unsigned int cmd, void *arg) | |
282 | { | |
283 | return -EINVAL; | |
284 | } | |
285 | ||
286 | #endif | |
287 | ||
288 | static int inet_check_attr(struct rtmsg *r, struct rtattr **rta) | |
289 | { | |
290 | int i; | |
291 | ||
caf5b04c LT |
292 | for (i=1; i<=RTA_MAX; i++, rta++) { |
293 | struct rtattr *attr = *rta; | |
1da177e4 LT |
294 | if (attr) { |
295 | if (RTA_PAYLOAD(attr) < 4) | |
296 | return -EINVAL; | |
297 | if (i != RTA_MULTIPATH && i != RTA_METRICS) | |
caf5b04c | 298 | *rta = (struct rtattr*)RTA_DATA(attr); |
1da177e4 LT |
299 | } |
300 | } | |
301 | return 0; | |
302 | } | |
303 | ||
304 | int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) | |
305 | { | |
306 | struct fib_table * tb; | |
307 | struct rtattr **rta = arg; | |
308 | struct rtmsg *r = NLMSG_DATA(nlh); | |
309 | ||
310 | if (inet_check_attr(r, rta)) | |
311 | return -EINVAL; | |
312 | ||
313 | tb = fib_get_table(r->rtm_table); | |
314 | if (tb) | |
315 | return tb->tb_delete(tb, r, (struct kern_rta*)rta, nlh, &NETLINK_CB(skb)); | |
316 | return -ESRCH; | |
317 | } | |
318 | ||
319 | int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) | |
320 | { | |
321 | struct fib_table * tb; | |
322 | struct rtattr **rta = arg; | |
323 | struct rtmsg *r = NLMSG_DATA(nlh); | |
324 | ||
325 | if (inet_check_attr(r, rta)) | |
326 | return -EINVAL; | |
327 | ||
328 | tb = fib_new_table(r->rtm_table); | |
329 | if (tb) | |
330 | return tb->tb_insert(tb, r, (struct kern_rta*)rta, nlh, &NETLINK_CB(skb)); | |
331 | return -ENOBUFS; | |
332 | } | |
333 | ||
334 | int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb) | |
335 | { | |
336 | int t; | |
337 | int s_t; | |
338 | struct fib_table *tb; | |
339 | ||
340 | if (NLMSG_PAYLOAD(cb->nlh, 0) >= sizeof(struct rtmsg) && | |
341 | ((struct rtmsg*)NLMSG_DATA(cb->nlh))->rtm_flags&RTM_F_CLONED) | |
342 | return ip_rt_dump(skb, cb); | |
343 | ||
344 | s_t = cb->args[0]; | |
345 | if (s_t == 0) | |
346 | s_t = cb->args[0] = RT_TABLE_MIN; | |
347 | ||
348 | for (t=s_t; t<=RT_TABLE_MAX; t++) { | |
349 | if (t < s_t) continue; | |
350 | if (t > s_t) | |
351 | memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(cb->args[0])); | |
352 | if ((tb = fib_get_table(t))==NULL) | |
353 | continue; | |
354 | if (tb->tb_dump(tb, skb, cb) < 0) | |
355 | break; | |
356 | } | |
357 | ||
358 | cb->args[0] = t; | |
359 | ||
360 | return skb->len; | |
361 | } | |
362 | ||
363 | /* Prepare and feed intra-kernel routing request. | |
364 | Really, it should be netlink message, but :-( netlink | |
365 | can be not configured, so that we feed it directly | |
366 | to fib engine. It is legal, because all events occur | |
367 | only when netlink is already locked. | |
368 | */ | |
369 | ||
370 | static void fib_magic(int cmd, int type, u32 dst, int dst_len, struct in_ifaddr *ifa) | |
371 | { | |
372 | struct fib_table * tb; | |
373 | struct { | |
374 | struct nlmsghdr nlh; | |
375 | struct rtmsg rtm; | |
376 | } req; | |
377 | struct kern_rta rta; | |
378 | ||
379 | memset(&req.rtm, 0, sizeof(req.rtm)); | |
380 | memset(&rta, 0, sizeof(rta)); | |
381 | ||
382 | if (type == RTN_UNICAST) | |
383 | tb = fib_new_table(RT_TABLE_MAIN); | |
384 | else | |
385 | tb = fib_new_table(RT_TABLE_LOCAL); | |
386 | ||
387 | if (tb == NULL) | |
388 | return; | |
389 | ||
390 | req.nlh.nlmsg_len = sizeof(req); | |
391 | req.nlh.nlmsg_type = cmd; | |
392 | req.nlh.nlmsg_flags = NLM_F_REQUEST|NLM_F_CREATE|NLM_F_APPEND; | |
393 | req.nlh.nlmsg_pid = 0; | |
394 | req.nlh.nlmsg_seq = 0; | |
395 | ||
396 | req.rtm.rtm_dst_len = dst_len; | |
397 | req.rtm.rtm_table = tb->tb_id; | |
398 | req.rtm.rtm_protocol = RTPROT_KERNEL; | |
399 | req.rtm.rtm_scope = (type != RTN_LOCAL ? RT_SCOPE_LINK : RT_SCOPE_HOST); | |
400 | req.rtm.rtm_type = type; | |
401 | ||
402 | rta.rta_dst = &dst; | |
403 | rta.rta_prefsrc = &ifa->ifa_local; | |
404 | rta.rta_oif = &ifa->ifa_dev->dev->ifindex; | |
405 | ||
406 | if (cmd == RTM_NEWROUTE) | |
407 | tb->tb_insert(tb, &req.rtm, &rta, &req.nlh, NULL); | |
408 | else | |
409 | tb->tb_delete(tb, &req.rtm, &rta, &req.nlh, NULL); | |
410 | } | |
411 | ||
0ff60a45 | 412 | void fib_add_ifaddr(struct in_ifaddr *ifa) |
1da177e4 LT |
413 | { |
414 | struct in_device *in_dev = ifa->ifa_dev; | |
415 | struct net_device *dev = in_dev->dev; | |
416 | struct in_ifaddr *prim = ifa; | |
417 | u32 mask = ifa->ifa_mask; | |
418 | u32 addr = ifa->ifa_local; | |
419 | u32 prefix = ifa->ifa_address&mask; | |
420 | ||
421 | if (ifa->ifa_flags&IFA_F_SECONDARY) { | |
422 | prim = inet_ifa_byprefix(in_dev, prefix, mask); | |
423 | if (prim == NULL) { | |
424 | printk(KERN_DEBUG "fib_add_ifaddr: bug: prim == NULL\n"); | |
425 | return; | |
426 | } | |
427 | } | |
428 | ||
429 | fib_magic(RTM_NEWROUTE, RTN_LOCAL, addr, 32, prim); | |
430 | ||
431 | if (!(dev->flags&IFF_UP)) | |
432 | return; | |
433 | ||
434 | /* Add broadcast address, if it is explicitly assigned. */ | |
435 | if (ifa->ifa_broadcast && ifa->ifa_broadcast != 0xFFFFFFFF) | |
436 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); | |
437 | ||
438 | if (!ZERONET(prefix) && !(ifa->ifa_flags&IFA_F_SECONDARY) && | |
439 | (prefix != addr || ifa->ifa_prefixlen < 32)) { | |
440 | fib_magic(RTM_NEWROUTE, dev->flags&IFF_LOOPBACK ? RTN_LOCAL : | |
441 | RTN_UNICAST, prefix, ifa->ifa_prefixlen, prim); | |
442 | ||
443 | /* Add network specific broadcasts, when it takes a sense */ | |
444 | if (ifa->ifa_prefixlen < 31) { | |
445 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix, 32, prim); | |
446 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix|~mask, 32, prim); | |
447 | } | |
448 | } | |
449 | } | |
450 | ||
451 | static void fib_del_ifaddr(struct in_ifaddr *ifa) | |
452 | { | |
453 | struct in_device *in_dev = ifa->ifa_dev; | |
454 | struct net_device *dev = in_dev->dev; | |
455 | struct in_ifaddr *ifa1; | |
456 | struct in_ifaddr *prim = ifa; | |
457 | u32 brd = ifa->ifa_address|~ifa->ifa_mask; | |
458 | u32 any = ifa->ifa_address&ifa->ifa_mask; | |
459 | #define LOCAL_OK 1 | |
460 | #define BRD_OK 2 | |
461 | #define BRD0_OK 4 | |
462 | #define BRD1_OK 8 | |
463 | unsigned ok = 0; | |
464 | ||
465 | if (!(ifa->ifa_flags&IFA_F_SECONDARY)) | |
466 | fib_magic(RTM_DELROUTE, dev->flags&IFF_LOOPBACK ? RTN_LOCAL : | |
467 | RTN_UNICAST, any, ifa->ifa_prefixlen, prim); | |
468 | else { | |
469 | prim = inet_ifa_byprefix(in_dev, any, ifa->ifa_mask); | |
470 | if (prim == NULL) { | |
471 | printk(KERN_DEBUG "fib_del_ifaddr: bug: prim == NULL\n"); | |
472 | return; | |
473 | } | |
474 | } | |
475 | ||
476 | /* Deletion is more complicated than add. | |
477 | We should take care of not to delete too much :-) | |
478 | ||
479 | Scan address list to be sure that addresses are really gone. | |
480 | */ | |
481 | ||
482 | for (ifa1 = in_dev->ifa_list; ifa1; ifa1 = ifa1->ifa_next) { | |
483 | if (ifa->ifa_local == ifa1->ifa_local) | |
484 | ok |= LOCAL_OK; | |
485 | if (ifa->ifa_broadcast == ifa1->ifa_broadcast) | |
486 | ok |= BRD_OK; | |
487 | if (brd == ifa1->ifa_broadcast) | |
488 | ok |= BRD1_OK; | |
489 | if (any == ifa1->ifa_broadcast) | |
490 | ok |= BRD0_OK; | |
491 | } | |
492 | ||
493 | if (!(ok&BRD_OK)) | |
494 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); | |
495 | if (!(ok&BRD1_OK)) | |
496 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, brd, 32, prim); | |
497 | if (!(ok&BRD0_OK)) | |
498 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, any, 32, prim); | |
499 | if (!(ok&LOCAL_OK)) { | |
500 | fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 32, prim); | |
501 | ||
502 | /* Check, that this local address finally disappeared. */ | |
503 | if (inet_addr_type(ifa->ifa_local) != RTN_LOCAL) { | |
504 | /* And the last, but not the least thing. | |
505 | We must flush stray FIB entries. | |
506 | ||
507 | First of all, we scan fib_info list searching | |
508 | for stray nexthop entries, then ignite fib_flush. | |
509 | */ | |
510 | if (fib_sync_down(ifa->ifa_local, NULL, 0)) | |
511 | fib_flush(); | |
512 | } | |
513 | } | |
514 | #undef LOCAL_OK | |
515 | #undef BRD_OK | |
516 | #undef BRD0_OK | |
517 | #undef BRD1_OK | |
518 | } | |
519 | ||
246955fe RO |
520 | static void nl_fib_lookup(struct fib_result_nl *frn, struct fib_table *tb ) |
521 | { | |
522 | ||
523 | struct fib_result res; | |
524 | struct flowi fl = { .nl_u = { .ip4_u = { .daddr = frn->fl_addr, | |
525 | .fwmark = frn->fl_fwmark, | |
526 | .tos = frn->fl_tos, | |
527 | .scope = frn->fl_scope } } }; | |
528 | if (tb) { | |
529 | local_bh_disable(); | |
530 | ||
531 | frn->tb_id = tb->tb_id; | |
532 | frn->err = tb->tb_lookup(tb, &fl, &res); | |
533 | ||
534 | if (!frn->err) { | |
535 | frn->prefixlen = res.prefixlen; | |
536 | frn->nh_sel = res.nh_sel; | |
537 | frn->type = res.type; | |
538 | frn->scope = res.scope; | |
539 | } | |
540 | local_bh_enable(); | |
541 | } | |
542 | } | |
543 | ||
544 | static void nl_fib_input(struct sock *sk, int len) | |
545 | { | |
546 | struct sk_buff *skb = NULL; | |
547 | struct nlmsghdr *nlh = NULL; | |
548 | struct fib_result_nl *frn; | |
246955fe RO |
549 | u32 pid; |
550 | struct fib_table *tb; | |
551 | ||
ea86575e | 552 | skb = skb_dequeue(&sk->sk_receive_queue); |
246955fe | 553 | nlh = (struct nlmsghdr *)skb->data; |
ea86575e TG |
554 | if (skb->len < NLMSG_SPACE(0) || skb->len < nlh->nlmsg_len || |
555 | nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*frn))) { | |
556 | kfree_skb(skb); | |
557 | return; | |
558 | } | |
246955fe RO |
559 | |
560 | frn = (struct fib_result_nl *) NLMSG_DATA(nlh); | |
561 | tb = fib_get_table(frn->tb_id_in); | |
562 | ||
563 | nl_fib_lookup(frn, tb); | |
564 | ||
565 | pid = nlh->nlmsg_pid; /*pid of sending process */ | |
246955fe RO |
566 | NETLINK_CB(skb).pid = 0; /* from kernel */ |
567 | NETLINK_CB(skb).dst_pid = pid; | |
ac6d439d | 568 | NETLINK_CB(skb).dst_group = 0; /* unicast */ |
246955fe RO |
569 | netlink_unicast(sk, skb, pid, MSG_DONTWAIT); |
570 | } | |
571 | ||
572 | static void nl_fib_lookup_init(void) | |
573 | { | |
06628607 | 574 | netlink_kernel_create(NETLINK_FIB_LOOKUP, 0, nl_fib_input, THIS_MODULE); |
246955fe RO |
575 | } |
576 | ||
1da177e4 LT |
577 | static void fib_disable_ip(struct net_device *dev, int force) |
578 | { | |
579 | if (fib_sync_down(0, dev, force)) | |
580 | fib_flush(); | |
581 | rt_cache_flush(0); | |
582 | arp_ifdown(dev); | |
583 | } | |
584 | ||
585 | static int fib_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr) | |
586 | { | |
587 | struct in_ifaddr *ifa = (struct in_ifaddr*)ptr; | |
588 | ||
589 | switch (event) { | |
590 | case NETDEV_UP: | |
591 | fib_add_ifaddr(ifa); | |
592 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
593 | fib_sync_up(ifa->ifa_dev->dev); | |
594 | #endif | |
595 | rt_cache_flush(-1); | |
596 | break; | |
597 | case NETDEV_DOWN: | |
598 | fib_del_ifaddr(ifa); | |
9fcc2e8a | 599 | if (ifa->ifa_dev->ifa_list == NULL) { |
1da177e4 LT |
600 | /* Last address was deleted from this interface. |
601 | Disable IP. | |
602 | */ | |
603 | fib_disable_ip(ifa->ifa_dev->dev, 1); | |
604 | } else { | |
605 | rt_cache_flush(-1); | |
606 | } | |
607 | break; | |
608 | } | |
609 | return NOTIFY_DONE; | |
610 | } | |
611 | ||
612 | static int fib_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
613 | { | |
614 | struct net_device *dev = ptr; | |
e5ed6399 | 615 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
616 | |
617 | if (event == NETDEV_UNREGISTER) { | |
618 | fib_disable_ip(dev, 2); | |
619 | return NOTIFY_DONE; | |
620 | } | |
621 | ||
622 | if (!in_dev) | |
623 | return NOTIFY_DONE; | |
624 | ||
625 | switch (event) { | |
626 | case NETDEV_UP: | |
627 | for_ifa(in_dev) { | |
628 | fib_add_ifaddr(ifa); | |
629 | } endfor_ifa(in_dev); | |
630 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
631 | fib_sync_up(dev); | |
632 | #endif | |
633 | rt_cache_flush(-1); | |
634 | break; | |
635 | case NETDEV_DOWN: | |
636 | fib_disable_ip(dev, 0); | |
637 | break; | |
638 | case NETDEV_CHANGEMTU: | |
639 | case NETDEV_CHANGE: | |
640 | rt_cache_flush(0); | |
641 | break; | |
642 | } | |
643 | return NOTIFY_DONE; | |
644 | } | |
645 | ||
646 | static struct notifier_block fib_inetaddr_notifier = { | |
647 | .notifier_call =fib_inetaddr_event, | |
648 | }; | |
649 | ||
650 | static struct notifier_block fib_netdev_notifier = { | |
651 | .notifier_call =fib_netdev_event, | |
652 | }; | |
653 | ||
654 | void __init ip_fib_init(void) | |
655 | { | |
656 | #ifndef CONFIG_IP_MULTIPLE_TABLES | |
657 | ip_fib_local_table = fib_hash_init(RT_TABLE_LOCAL); | |
658 | ip_fib_main_table = fib_hash_init(RT_TABLE_MAIN); | |
659 | #else | |
660 | fib_rules_init(); | |
661 | #endif | |
662 | ||
663 | register_netdevice_notifier(&fib_netdev_notifier); | |
664 | register_inetaddr_notifier(&fib_inetaddr_notifier); | |
246955fe | 665 | nl_fib_lookup_init(); |
1da177e4 LT |
666 | } |
667 | ||
668 | EXPORT_SYMBOL(inet_addr_type); | |
1da177e4 | 669 | EXPORT_SYMBOL(ip_rt_ioctl); |