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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 | ||
38 | #include <net/ip.h> | |
39 | #include <net/protocol.h> | |
40 | #include <net/route.h> | |
41 | #include <net/tcp.h> | |
42 | #include <net/sock.h> | |
43 | #include <net/icmp.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 | ||
50 | static 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 | ||
68 | fail: | |
69 | kfree(local_table); | |
70 | return -ENOMEM; | |
71 | } | |
72 | #else | |
73 | ||
74 | struct 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 | ||
93 | struct 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 | ||
117 | void 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 | tb->tb_select_default(tb, flp, res); | |
130 | } | |
131 | ||
132 | static 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 += tb->tb_flush(tb); | |
144 | } | |
145 | ||
146 | if (flushed) | |
147 | rt_cache_flush(net, -1); | |
148 | } | |
149 | ||
150 | /* | |
151 | * Find the first device with a given source address. | |
152 | */ | |
153 | ||
154 | struct net_device * ip_dev_find(struct net *net, __be32 addr) | |
155 | { | |
156 | struct flowi fl = { .nl_u = { .ip4_u = { .daddr = addr } } }; | |
157 | struct fib_result res; | |
158 | struct net_device *dev = NULL; | |
159 | struct fib_table *local_table; | |
160 | ||
161 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
162 | res.r = NULL; | |
163 | #endif | |
164 | ||
165 | local_table = fib_get_table(net, RT_TABLE_LOCAL); | |
166 | if (!local_table || local_table->tb_lookup(local_table, &fl, &res)) | |
167 | return NULL; | |
168 | if (res.type != RTN_LOCAL) | |
169 | goto out; | |
170 | dev = FIB_RES_DEV(res); | |
171 | ||
172 | if (dev) | |
173 | dev_hold(dev); | |
174 | out: | |
175 | fib_res_put(&res); | |
176 | return dev; | |
177 | } | |
178 | ||
179 | /* | |
180 | * Find address type as if only "dev" was present in the system. If | |
181 | * on_dev is NULL then all interfaces are taken into consideration. | |
182 | */ | |
183 | static inline unsigned __inet_dev_addr_type(struct net *net, | |
184 | const struct net_device *dev, | |
185 | __be32 addr) | |
186 | { | |
187 | struct flowi fl = { .nl_u = { .ip4_u = { .daddr = addr } } }; | |
188 | struct fib_result res; | |
189 | unsigned ret = RTN_BROADCAST; | |
190 | struct fib_table *local_table; | |
191 | ||
192 | if (ipv4_is_zeronet(addr) || ipv4_is_lbcast(addr)) | |
193 | return RTN_BROADCAST; | |
194 | if (ipv4_is_multicast(addr)) | |
195 | return RTN_MULTICAST; | |
196 | ||
197 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
198 | res.r = NULL; | |
199 | #endif | |
200 | ||
201 | local_table = fib_get_table(net, RT_TABLE_LOCAL); | |
202 | if (local_table) { | |
203 | ret = RTN_UNICAST; | |
204 | if (!local_table->tb_lookup(local_table, &fl, &res)) { | |
205 | if (!dev || dev == res.fi->fib_dev) | |
206 | ret = res.type; | |
207 | fib_res_put(&res); | |
208 | } | |
209 | } | |
210 | return ret; | |
211 | } | |
212 | ||
213 | unsigned int inet_addr_type(struct net *net, __be32 addr) | |
214 | { | |
215 | return __inet_dev_addr_type(net, NULL, addr); | |
216 | } | |
217 | ||
218 | unsigned int inet_dev_addr_type(struct net *net, const struct net_device *dev, | |
219 | __be32 addr) | |
220 | { | |
221 | return __inet_dev_addr_type(net, dev, addr); | |
222 | } | |
223 | ||
224 | /* Given (packet source, input interface) and optional (dst, oif, tos): | |
225 | - (main) check, that source is valid i.e. not broadcast or our local | |
226 | address. | |
227 | - figure out what "logical" interface this packet arrived | |
228 | and calculate "specific destination" address. | |
229 | - check, that packet arrived from expected physical interface. | |
230 | */ | |
231 | ||
232 | int fib_validate_source(__be32 src, __be32 dst, u8 tos, int oif, | |
233 | struct net_device *dev, __be32 *spec_dst, u32 *itag) | |
234 | { | |
235 | struct in_device *in_dev; | |
236 | struct flowi fl = { .nl_u = { .ip4_u = | |
237 | { .daddr = src, | |
238 | .saddr = dst, | |
239 | .tos = tos } }, | |
240 | .iif = oif }; | |
241 | struct fib_result res; | |
242 | int no_addr, rpf; | |
243 | int ret; | |
244 | struct net *net; | |
245 | ||
246 | no_addr = rpf = 0; | |
247 | rcu_read_lock(); | |
248 | in_dev = __in_dev_get_rcu(dev); | |
249 | if (in_dev) { | |
250 | no_addr = in_dev->ifa_list == NULL; | |
251 | rpf = IN_DEV_RPFILTER(in_dev); | |
252 | } | |
253 | rcu_read_unlock(); | |
254 | ||
255 | if (in_dev == NULL) | |
256 | goto e_inval; | |
257 | ||
258 | net = dev_net(dev); | |
259 | if (fib_lookup(net, &fl, &res)) | |
260 | goto last_resort; | |
261 | if (res.type != RTN_UNICAST) | |
262 | goto e_inval_res; | |
263 | *spec_dst = FIB_RES_PREFSRC(res); | |
264 | fib_combine_itag(itag, &res); | |
265 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
266 | if (FIB_RES_DEV(res) == dev || res.fi->fib_nhs > 1) | |
267 | #else | |
268 | if (FIB_RES_DEV(res) == dev) | |
269 | #endif | |
270 | { | |
271 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; | |
272 | fib_res_put(&res); | |
273 | return ret; | |
274 | } | |
275 | fib_res_put(&res); | |
276 | if (no_addr) | |
277 | goto last_resort; | |
278 | if (rpf) | |
279 | goto e_inval; | |
280 | fl.oif = dev->ifindex; | |
281 | ||
282 | ret = 0; | |
283 | if (fib_lookup(net, &fl, &res) == 0) { | |
284 | if (res.type == RTN_UNICAST) { | |
285 | *spec_dst = FIB_RES_PREFSRC(res); | |
286 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; | |
287 | } | |
288 | fib_res_put(&res); | |
289 | } | |
290 | return ret; | |
291 | ||
292 | last_resort: | |
293 | if (rpf) | |
294 | goto e_inval; | |
295 | *spec_dst = inet_select_addr(dev, 0, RT_SCOPE_UNIVERSE); | |
296 | *itag = 0; | |
297 | return 0; | |
298 | ||
299 | e_inval_res: | |
300 | fib_res_put(&res); | |
301 | e_inval: | |
302 | return -EINVAL; | |
303 | } | |
304 | ||
305 | static inline __be32 sk_extract_addr(struct sockaddr *addr) | |
306 | { | |
307 | return ((struct sockaddr_in *) addr)->sin_addr.s_addr; | |
308 | } | |
309 | ||
310 | static int put_rtax(struct nlattr *mx, int len, int type, u32 value) | |
311 | { | |
312 | struct nlattr *nla; | |
313 | ||
314 | nla = (struct nlattr *) ((char *) mx + len); | |
315 | nla->nla_type = type; | |
316 | nla->nla_len = nla_attr_size(4); | |
317 | *(u32 *) nla_data(nla) = value; | |
318 | ||
319 | return len + nla_total_size(4); | |
320 | } | |
321 | ||
322 | static int rtentry_to_fib_config(struct net *net, int cmd, struct rtentry *rt, | |
323 | struct fib_config *cfg) | |
324 | { | |
325 | __be32 addr; | |
326 | int plen; | |
327 | ||
328 | memset(cfg, 0, sizeof(*cfg)); | |
329 | cfg->fc_nlinfo.nl_net = net; | |
330 | ||
331 | if (rt->rt_dst.sa_family != AF_INET) | |
332 | return -EAFNOSUPPORT; | |
333 | ||
334 | /* | |
335 | * Check mask for validity: | |
336 | * a) it must be contiguous. | |
337 | * b) destination must have all host bits clear. | |
338 | * c) if application forgot to set correct family (AF_INET), | |
339 | * reject request unless it is absolutely clear i.e. | |
340 | * both family and mask are zero. | |
341 | */ | |
342 | plen = 32; | |
343 | addr = sk_extract_addr(&rt->rt_dst); | |
344 | if (!(rt->rt_flags & RTF_HOST)) { | |
345 | __be32 mask = sk_extract_addr(&rt->rt_genmask); | |
346 | ||
347 | if (rt->rt_genmask.sa_family != AF_INET) { | |
348 | if (mask || rt->rt_genmask.sa_family) | |
349 | return -EAFNOSUPPORT; | |
350 | } | |
351 | ||
352 | if (bad_mask(mask, addr)) | |
353 | return -EINVAL; | |
354 | ||
355 | plen = inet_mask_len(mask); | |
356 | } | |
357 | ||
358 | cfg->fc_dst_len = plen; | |
359 | cfg->fc_dst = addr; | |
360 | ||
361 | if (cmd != SIOCDELRT) { | |
362 | cfg->fc_nlflags = NLM_F_CREATE; | |
363 | cfg->fc_protocol = RTPROT_BOOT; | |
364 | } | |
365 | ||
366 | if (rt->rt_metric) | |
367 | cfg->fc_priority = rt->rt_metric - 1; | |
368 | ||
369 | if (rt->rt_flags & RTF_REJECT) { | |
370 | cfg->fc_scope = RT_SCOPE_HOST; | |
371 | cfg->fc_type = RTN_UNREACHABLE; | |
372 | return 0; | |
373 | } | |
374 | ||
375 | cfg->fc_scope = RT_SCOPE_NOWHERE; | |
376 | cfg->fc_type = RTN_UNICAST; | |
377 | ||
378 | if (rt->rt_dev) { | |
379 | char *colon; | |
380 | struct net_device *dev; | |
381 | char devname[IFNAMSIZ]; | |
382 | ||
383 | if (copy_from_user(devname, rt->rt_dev, IFNAMSIZ-1)) | |
384 | return -EFAULT; | |
385 | ||
386 | devname[IFNAMSIZ-1] = 0; | |
387 | colon = strchr(devname, ':'); | |
388 | if (colon) | |
389 | *colon = 0; | |
390 | dev = __dev_get_by_name(net, devname); | |
391 | if (!dev) | |
392 | return -ENODEV; | |
393 | cfg->fc_oif = dev->ifindex; | |
394 | if (colon) { | |
395 | struct in_ifaddr *ifa; | |
396 | struct in_device *in_dev = __in_dev_get_rtnl(dev); | |
397 | if (!in_dev) | |
398 | return -ENODEV; | |
399 | *colon = ':'; | |
400 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) | |
401 | if (strcmp(ifa->ifa_label, devname) == 0) | |
402 | break; | |
403 | if (ifa == NULL) | |
404 | return -ENODEV; | |
405 | cfg->fc_prefsrc = ifa->ifa_local; | |
406 | } | |
407 | } | |
408 | ||
409 | addr = sk_extract_addr(&rt->rt_gateway); | |
410 | if (rt->rt_gateway.sa_family == AF_INET && addr) { | |
411 | cfg->fc_gw = addr; | |
412 | if (rt->rt_flags & RTF_GATEWAY && | |
413 | inet_addr_type(net, addr) == RTN_UNICAST) | |
414 | cfg->fc_scope = RT_SCOPE_UNIVERSE; | |
415 | } | |
416 | ||
417 | if (cmd == SIOCDELRT) | |
418 | return 0; | |
419 | ||
420 | if (rt->rt_flags & RTF_GATEWAY && !cfg->fc_gw) | |
421 | return -EINVAL; | |
422 | ||
423 | if (cfg->fc_scope == RT_SCOPE_NOWHERE) | |
424 | cfg->fc_scope = RT_SCOPE_LINK; | |
425 | ||
426 | if (rt->rt_flags & (RTF_MTU | RTF_WINDOW | RTF_IRTT)) { | |
427 | struct nlattr *mx; | |
428 | int len = 0; | |
429 | ||
430 | mx = kzalloc(3 * nla_total_size(4), GFP_KERNEL); | |
431 | if (mx == NULL) | |
432 | return -ENOMEM; | |
433 | ||
434 | if (rt->rt_flags & RTF_MTU) | |
435 | len = put_rtax(mx, len, RTAX_ADVMSS, rt->rt_mtu - 40); | |
436 | ||
437 | if (rt->rt_flags & RTF_WINDOW) | |
438 | len = put_rtax(mx, len, RTAX_WINDOW, rt->rt_window); | |
439 | ||
440 | if (rt->rt_flags & RTF_IRTT) | |
441 | len = put_rtax(mx, len, RTAX_RTT, rt->rt_irtt << 3); | |
442 | ||
443 | cfg->fc_mx = mx; | |
444 | cfg->fc_mx_len = len; | |
445 | } | |
446 | ||
447 | return 0; | |
448 | } | |
449 | ||
450 | /* | |
451 | * Handle IP routing ioctl calls. These are used to manipulate the routing tables | |
452 | */ | |
453 | ||
454 | int ip_rt_ioctl(struct net *net, unsigned int cmd, void __user *arg) | |
455 | { | |
456 | struct fib_config cfg; | |
457 | struct rtentry rt; | |
458 | int err; | |
459 | ||
460 | switch (cmd) { | |
461 | case SIOCADDRT: /* Add a route */ | |
462 | case SIOCDELRT: /* Delete a route */ | |
463 | if (!capable(CAP_NET_ADMIN)) | |
464 | return -EPERM; | |
465 | ||
466 | if (copy_from_user(&rt, arg, sizeof(rt))) | |
467 | return -EFAULT; | |
468 | ||
469 | rtnl_lock(); | |
470 | err = rtentry_to_fib_config(net, cmd, &rt, &cfg); | |
471 | if (err == 0) { | |
472 | struct fib_table *tb; | |
473 | ||
474 | if (cmd == SIOCDELRT) { | |
475 | tb = fib_get_table(net, cfg.fc_table); | |
476 | if (tb) | |
477 | err = tb->tb_delete(tb, &cfg); | |
478 | else | |
479 | err = -ESRCH; | |
480 | } else { | |
481 | tb = fib_new_table(net, cfg.fc_table); | |
482 | if (tb) | |
483 | err = tb->tb_insert(tb, &cfg); | |
484 | else | |
485 | err = -ENOBUFS; | |
486 | } | |
487 | ||
488 | /* allocated by rtentry_to_fib_config() */ | |
489 | kfree(cfg.fc_mx); | |
490 | } | |
491 | rtnl_unlock(); | |
492 | return err; | |
493 | } | |
494 | return -EINVAL; | |
495 | } | |
496 | ||
497 | const struct nla_policy rtm_ipv4_policy[RTA_MAX+1] = { | |
498 | [RTA_DST] = { .type = NLA_U32 }, | |
499 | [RTA_SRC] = { .type = NLA_U32 }, | |
500 | [RTA_IIF] = { .type = NLA_U32 }, | |
501 | [RTA_OIF] = { .type = NLA_U32 }, | |
502 | [RTA_GATEWAY] = { .type = NLA_U32 }, | |
503 | [RTA_PRIORITY] = { .type = NLA_U32 }, | |
504 | [RTA_PREFSRC] = { .type = NLA_U32 }, | |
505 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
506 | [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, | |
507 | [RTA_FLOW] = { .type = NLA_U32 }, | |
508 | }; | |
509 | ||
510 | static int rtm_to_fib_config(struct net *net, struct sk_buff *skb, | |
511 | struct nlmsghdr *nlh, struct fib_config *cfg) | |
512 | { | |
513 | struct nlattr *attr; | |
514 | int err, remaining; | |
515 | struct rtmsg *rtm; | |
516 | ||
517 | err = nlmsg_validate(nlh, sizeof(*rtm), RTA_MAX, rtm_ipv4_policy); | |
518 | if (err < 0) | |
519 | goto errout; | |
520 | ||
521 | memset(cfg, 0, sizeof(*cfg)); | |
522 | ||
523 | rtm = nlmsg_data(nlh); | |
524 | cfg->fc_dst_len = rtm->rtm_dst_len; | |
525 | cfg->fc_tos = rtm->rtm_tos; | |
526 | cfg->fc_table = rtm->rtm_table; | |
527 | cfg->fc_protocol = rtm->rtm_protocol; | |
528 | cfg->fc_scope = rtm->rtm_scope; | |
529 | cfg->fc_type = rtm->rtm_type; | |
530 | cfg->fc_flags = rtm->rtm_flags; | |
531 | cfg->fc_nlflags = nlh->nlmsg_flags; | |
532 | ||
533 | cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid; | |
534 | cfg->fc_nlinfo.nlh = nlh; | |
535 | cfg->fc_nlinfo.nl_net = net; | |
536 | ||
537 | if (cfg->fc_type > RTN_MAX) { | |
538 | err = -EINVAL; | |
539 | goto errout; | |
540 | } | |
541 | ||
542 | nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), remaining) { | |
543 | switch (nla_type(attr)) { | |
544 | case RTA_DST: | |
545 | cfg->fc_dst = nla_get_be32(attr); | |
546 | break; | |
547 | case RTA_OIF: | |
548 | cfg->fc_oif = nla_get_u32(attr); | |
549 | break; | |
550 | case RTA_GATEWAY: | |
551 | cfg->fc_gw = nla_get_be32(attr); | |
552 | break; | |
553 | case RTA_PRIORITY: | |
554 | cfg->fc_priority = nla_get_u32(attr); | |
555 | break; | |
556 | case RTA_PREFSRC: | |
557 | cfg->fc_prefsrc = nla_get_be32(attr); | |
558 | break; | |
559 | case RTA_METRICS: | |
560 | cfg->fc_mx = nla_data(attr); | |
561 | cfg->fc_mx_len = nla_len(attr); | |
562 | break; | |
563 | case RTA_MULTIPATH: | |
564 | cfg->fc_mp = nla_data(attr); | |
565 | cfg->fc_mp_len = nla_len(attr); | |
566 | break; | |
567 | case RTA_FLOW: | |
568 | cfg->fc_flow = nla_get_u32(attr); | |
569 | break; | |
570 | case RTA_TABLE: | |
571 | cfg->fc_table = nla_get_u32(attr); | |
572 | break; | |
573 | } | |
574 | } | |
575 | ||
576 | return 0; | |
577 | errout: | |
578 | return err; | |
579 | } | |
580 | ||
581 | static int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) | |
582 | { | |
583 | struct net *net = sock_net(skb->sk); | |
584 | struct fib_config cfg; | |
585 | struct fib_table *tb; | |
586 | int err; | |
587 | ||
588 | err = rtm_to_fib_config(net, skb, nlh, &cfg); | |
589 | if (err < 0) | |
590 | goto errout; | |
591 | ||
592 | tb = fib_get_table(net, cfg.fc_table); | |
593 | if (tb == NULL) { | |
594 | err = -ESRCH; | |
595 | goto errout; | |
596 | } | |
597 | ||
598 | err = tb->tb_delete(tb, &cfg); | |
599 | errout: | |
600 | return err; | |
601 | } | |
602 | ||
603 | static int inet_rtm_newroute(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_new_table(net, cfg.fc_table); | |
615 | if (tb == NULL) { | |
616 | err = -ENOBUFS; | |
617 | goto errout; | |
618 | } | |
619 | ||
620 | err = tb->tb_insert(tb, &cfg); | |
621 | errout: | |
622 | return err; | |
623 | } | |
624 | ||
625 | static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb) | |
626 | { | |
627 | struct net *net = sock_net(skb->sk); | |
628 | unsigned int h, s_h; | |
629 | unsigned int e = 0, s_e; | |
630 | struct fib_table *tb; | |
631 | struct hlist_node *node; | |
632 | struct hlist_head *head; | |
633 | int dumped = 0; | |
634 | ||
635 | if (nlmsg_len(cb->nlh) >= sizeof(struct rtmsg) && | |
636 | ((struct rtmsg *) nlmsg_data(cb->nlh))->rtm_flags & RTM_F_CLONED) | |
637 | return ip_rt_dump(skb, cb); | |
638 | ||
639 | s_h = cb->args[0]; | |
640 | s_e = cb->args[1]; | |
641 | ||
642 | for (h = s_h; h < FIB_TABLE_HASHSZ; h++, s_e = 0) { | |
643 | e = 0; | |
644 | head = &net->ipv4.fib_table_hash[h]; | |
645 | hlist_for_each_entry(tb, node, head, tb_hlist) { | |
646 | if (e < s_e) | |
647 | goto next; | |
648 | if (dumped) | |
649 | memset(&cb->args[2], 0, sizeof(cb->args) - | |
650 | 2 * sizeof(cb->args[0])); | |
651 | if (tb->tb_dump(tb, skb, cb) < 0) | |
652 | goto out; | |
653 | dumped = 1; | |
654 | next: | |
655 | e++; | |
656 | } | |
657 | } | |
658 | out: | |
659 | cb->args[1] = e; | |
660 | cb->args[0] = h; | |
661 | ||
662 | return skb->len; | |
663 | } | |
664 | ||
665 | /* Prepare and feed intra-kernel routing request. | |
666 | Really, it should be netlink message, but :-( netlink | |
667 | can be not configured, so that we feed it directly | |
668 | to fib engine. It is legal, because all events occur | |
669 | only when netlink is already locked. | |
670 | */ | |
671 | ||
672 | static void fib_magic(int cmd, int type, __be32 dst, int dst_len, struct in_ifaddr *ifa) | |
673 | { | |
674 | struct net *net = dev_net(ifa->ifa_dev->dev); | |
675 | struct fib_table *tb; | |
676 | struct fib_config cfg = { | |
677 | .fc_protocol = RTPROT_KERNEL, | |
678 | .fc_type = type, | |
679 | .fc_dst = dst, | |
680 | .fc_dst_len = dst_len, | |
681 | .fc_prefsrc = ifa->ifa_local, | |
682 | .fc_oif = ifa->ifa_dev->dev->ifindex, | |
683 | .fc_nlflags = NLM_F_CREATE | NLM_F_APPEND, | |
684 | .fc_nlinfo = { | |
685 | .nl_net = net, | |
686 | }, | |
687 | }; | |
688 | ||
689 | if (type == RTN_UNICAST) | |
690 | tb = fib_new_table(net, RT_TABLE_MAIN); | |
691 | else | |
692 | tb = fib_new_table(net, RT_TABLE_LOCAL); | |
693 | ||
694 | if (tb == NULL) | |
695 | return; | |
696 | ||
697 | cfg.fc_table = tb->tb_id; | |
698 | ||
699 | if (type != RTN_LOCAL) | |
700 | cfg.fc_scope = RT_SCOPE_LINK; | |
701 | else | |
702 | cfg.fc_scope = RT_SCOPE_HOST; | |
703 | ||
704 | if (cmd == RTM_NEWROUTE) | |
705 | tb->tb_insert(tb, &cfg); | |
706 | else | |
707 | tb->tb_delete(tb, &cfg); | |
708 | } | |
709 | ||
710 | void fib_add_ifaddr(struct in_ifaddr *ifa) | |
711 | { | |
712 | struct in_device *in_dev = ifa->ifa_dev; | |
713 | struct net_device *dev = in_dev->dev; | |
714 | struct in_ifaddr *prim = ifa; | |
715 | __be32 mask = ifa->ifa_mask; | |
716 | __be32 addr = ifa->ifa_local; | |
717 | __be32 prefix = ifa->ifa_address&mask; | |
718 | ||
719 | if (ifa->ifa_flags&IFA_F_SECONDARY) { | |
720 | prim = inet_ifa_byprefix(in_dev, prefix, mask); | |
721 | if (prim == NULL) { | |
722 | printk(KERN_WARNING "fib_add_ifaddr: bug: prim == NULL\n"); | |
723 | return; | |
724 | } | |
725 | } | |
726 | ||
727 | fib_magic(RTM_NEWROUTE, RTN_LOCAL, addr, 32, prim); | |
728 | ||
729 | if (!(dev->flags&IFF_UP)) | |
730 | return; | |
731 | ||
732 | /* Add broadcast address, if it is explicitly assigned. */ | |
733 | if (ifa->ifa_broadcast && ifa->ifa_broadcast != htonl(0xFFFFFFFF)) | |
734 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); | |
735 | ||
736 | if (!ipv4_is_zeronet(prefix) && !(ifa->ifa_flags&IFA_F_SECONDARY) && | |
737 | (prefix != addr || ifa->ifa_prefixlen < 32)) { | |
738 | fib_magic(RTM_NEWROUTE, dev->flags&IFF_LOOPBACK ? RTN_LOCAL : | |
739 | RTN_UNICAST, prefix, ifa->ifa_prefixlen, prim); | |
740 | ||
741 | /* Add network specific broadcasts, when it takes a sense */ | |
742 | if (ifa->ifa_prefixlen < 31) { | |
743 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix, 32, prim); | |
744 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix|~mask, 32, prim); | |
745 | } | |
746 | } | |
747 | } | |
748 | ||
749 | static void fib_del_ifaddr(struct in_ifaddr *ifa) | |
750 | { | |
751 | struct in_device *in_dev = ifa->ifa_dev; | |
752 | struct net_device *dev = in_dev->dev; | |
753 | struct in_ifaddr *ifa1; | |
754 | struct in_ifaddr *prim = ifa; | |
755 | __be32 brd = ifa->ifa_address|~ifa->ifa_mask; | |
756 | __be32 any = ifa->ifa_address&ifa->ifa_mask; | |
757 | #define LOCAL_OK 1 | |
758 | #define BRD_OK 2 | |
759 | #define BRD0_OK 4 | |
760 | #define BRD1_OK 8 | |
761 | unsigned ok = 0; | |
762 | ||
763 | if (!(ifa->ifa_flags&IFA_F_SECONDARY)) | |
764 | fib_magic(RTM_DELROUTE, dev->flags&IFF_LOOPBACK ? RTN_LOCAL : | |
765 | RTN_UNICAST, any, ifa->ifa_prefixlen, prim); | |
766 | else { | |
767 | prim = inet_ifa_byprefix(in_dev, any, ifa->ifa_mask); | |
768 | if (prim == NULL) { | |
769 | printk(KERN_WARNING "fib_del_ifaddr: bug: prim == NULL\n"); | |
770 | return; | |
771 | } | |
772 | } | |
773 | ||
774 | /* Deletion is more complicated than add. | |
775 | We should take care of not to delete too much :-) | |
776 | ||
777 | Scan address list to be sure that addresses are really gone. | |
778 | */ | |
779 | ||
780 | for (ifa1 = in_dev->ifa_list; ifa1; ifa1 = ifa1->ifa_next) { | |
781 | if (ifa->ifa_local == ifa1->ifa_local) | |
782 | ok |= LOCAL_OK; | |
783 | if (ifa->ifa_broadcast == ifa1->ifa_broadcast) | |
784 | ok |= BRD_OK; | |
785 | if (brd == ifa1->ifa_broadcast) | |
786 | ok |= BRD1_OK; | |
787 | if (any == ifa1->ifa_broadcast) | |
788 | ok |= BRD0_OK; | |
789 | } | |
790 | ||
791 | if (!(ok&BRD_OK)) | |
792 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); | |
793 | if (!(ok&BRD1_OK)) | |
794 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, brd, 32, prim); | |
795 | if (!(ok&BRD0_OK)) | |
796 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, any, 32, prim); | |
797 | if (!(ok&LOCAL_OK)) { | |
798 | fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 32, prim); | |
799 | ||
800 | /* Check, that this local address finally disappeared. */ | |
801 | if (inet_addr_type(dev_net(dev), ifa->ifa_local) != RTN_LOCAL) { | |
802 | /* And the last, but not the least thing. | |
803 | We must flush stray FIB entries. | |
804 | ||
805 | First of all, we scan fib_info list searching | |
806 | for stray nexthop entries, then ignite fib_flush. | |
807 | */ | |
808 | if (fib_sync_down_addr(dev_net(dev), ifa->ifa_local)) | |
809 | fib_flush(dev_net(dev)); | |
810 | } | |
811 | } | |
812 | #undef LOCAL_OK | |
813 | #undef BRD_OK | |
814 | #undef BRD0_OK | |
815 | #undef BRD1_OK | |
816 | } | |
817 | ||
818 | static void nl_fib_lookup(struct fib_result_nl *frn, struct fib_table *tb ) | |
819 | { | |
820 | ||
821 | struct fib_result res; | |
822 | struct flowi fl = { .mark = frn->fl_mark, | |
823 | .nl_u = { .ip4_u = { .daddr = frn->fl_addr, | |
824 | .tos = frn->fl_tos, | |
825 | .scope = frn->fl_scope } } }; | |
826 | ||
827 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
828 | res.r = NULL; | |
829 | #endif | |
830 | ||
831 | frn->err = -ENOENT; | |
832 | if (tb) { | |
833 | local_bh_disable(); | |
834 | ||
835 | frn->tb_id = tb->tb_id; | |
836 | frn->err = tb->tb_lookup(tb, &fl, &res); | |
837 | ||
838 | if (!frn->err) { | |
839 | frn->prefixlen = res.prefixlen; | |
840 | frn->nh_sel = res.nh_sel; | |
841 | frn->type = res.type; | |
842 | frn->scope = res.scope; | |
843 | fib_res_put(&res); | |
844 | } | |
845 | local_bh_enable(); | |
846 | } | |
847 | } | |
848 | ||
849 | static void nl_fib_input(struct sk_buff *skb) | |
850 | { | |
851 | struct net *net; | |
852 | struct fib_result_nl *frn; | |
853 | struct nlmsghdr *nlh; | |
854 | struct fib_table *tb; | |
855 | u32 pid; | |
856 | ||
857 | net = sock_net(skb->sk); | |
858 | nlh = nlmsg_hdr(skb); | |
859 | if (skb->len < NLMSG_SPACE(0) || skb->len < nlh->nlmsg_len || | |
860 | nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*frn))) | |
861 | return; | |
862 | ||
863 | skb = skb_clone(skb, GFP_KERNEL); | |
864 | if (skb == NULL) | |
865 | return; | |
866 | nlh = nlmsg_hdr(skb); | |
867 | ||
868 | frn = (struct fib_result_nl *) NLMSG_DATA(nlh); | |
869 | tb = fib_get_table(net, frn->tb_id_in); | |
870 | ||
871 | nl_fib_lookup(frn, tb); | |
872 | ||
873 | pid = NETLINK_CB(skb).pid; /* pid of sending process */ | |
874 | NETLINK_CB(skb).pid = 0; /* from kernel */ | |
875 | NETLINK_CB(skb).dst_group = 0; /* unicast */ | |
876 | netlink_unicast(net->ipv4.fibnl, skb, pid, MSG_DONTWAIT); | |
877 | } | |
878 | ||
879 | static int nl_fib_lookup_init(struct net *net) | |
880 | { | |
881 | struct sock *sk; | |
882 | sk = netlink_kernel_create(net, NETLINK_FIB_LOOKUP, 0, | |
883 | nl_fib_input, NULL, THIS_MODULE); | |
884 | if (sk == NULL) | |
885 | return -EAFNOSUPPORT; | |
886 | net->ipv4.fibnl = sk; | |
887 | return 0; | |
888 | } | |
889 | ||
890 | static void nl_fib_lookup_exit(struct net *net) | |
891 | { | |
892 | netlink_kernel_release(net->ipv4.fibnl); | |
893 | net->ipv4.fibnl = NULL; | |
894 | } | |
895 | ||
896 | static void fib_disable_ip(struct net_device *dev, int force) | |
897 | { | |
898 | if (fib_sync_down_dev(dev, force)) | |
899 | fib_flush(dev_net(dev)); | |
900 | rt_cache_flush(dev_net(dev), 0); | |
901 | arp_ifdown(dev); | |
902 | } | |
903 | ||
904 | static int fib_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr) | |
905 | { | |
906 | struct in_ifaddr *ifa = (struct in_ifaddr *)ptr; | |
907 | struct net_device *dev = ifa->ifa_dev->dev; | |
908 | ||
909 | switch (event) { | |
910 | case NETDEV_UP: | |
911 | fib_add_ifaddr(ifa); | |
912 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
913 | fib_sync_up(dev); | |
914 | #endif | |
915 | rt_cache_flush(dev_net(dev), -1); | |
916 | break; | |
917 | case NETDEV_DOWN: | |
918 | fib_del_ifaddr(ifa); | |
919 | if (ifa->ifa_dev->ifa_list == NULL) { | |
920 | /* Last address was deleted from this interface. | |
921 | Disable IP. | |
922 | */ | |
923 | fib_disable_ip(dev, 1); | |
924 | } else { | |
925 | rt_cache_flush(dev_net(dev), -1); | |
926 | } | |
927 | break; | |
928 | } | |
929 | return NOTIFY_DONE; | |
930 | } | |
931 | ||
932 | static int fib_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
933 | { | |
934 | struct net_device *dev = ptr; | |
935 | struct in_device *in_dev = __in_dev_get_rtnl(dev); | |
936 | ||
937 | if (event == NETDEV_UNREGISTER) { | |
938 | fib_disable_ip(dev, 2); | |
939 | return NOTIFY_DONE; | |
940 | } | |
941 | ||
942 | if (!in_dev) | |
943 | return NOTIFY_DONE; | |
944 | ||
945 | switch (event) { | |
946 | case NETDEV_UP: | |
947 | for_ifa(in_dev) { | |
948 | fib_add_ifaddr(ifa); | |
949 | } endfor_ifa(in_dev); | |
950 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
951 | fib_sync_up(dev); | |
952 | #endif | |
953 | rt_cache_flush(dev_net(dev), -1); | |
954 | break; | |
955 | case NETDEV_DOWN: | |
956 | fib_disable_ip(dev, 0); | |
957 | break; | |
958 | case NETDEV_CHANGEMTU: | |
959 | case NETDEV_CHANGE: | |
960 | rt_cache_flush(dev_net(dev), 0); | |
961 | break; | |
962 | } | |
963 | return NOTIFY_DONE; | |
964 | } | |
965 | ||
966 | static struct notifier_block fib_inetaddr_notifier = { | |
967 | .notifier_call = fib_inetaddr_event, | |
968 | }; | |
969 | ||
970 | static struct notifier_block fib_netdev_notifier = { | |
971 | .notifier_call = fib_netdev_event, | |
972 | }; | |
973 | ||
974 | static int __net_init ip_fib_net_init(struct net *net) | |
975 | { | |
976 | int err; | |
977 | unsigned int i; | |
978 | ||
979 | net->ipv4.fib_table_hash = kzalloc( | |
980 | sizeof(struct hlist_head)*FIB_TABLE_HASHSZ, GFP_KERNEL); | |
981 | if (net->ipv4.fib_table_hash == NULL) | |
982 | return -ENOMEM; | |
983 | ||
984 | for (i = 0; i < FIB_TABLE_HASHSZ; i++) | |
985 | INIT_HLIST_HEAD(&net->ipv4.fib_table_hash[i]); | |
986 | ||
987 | err = fib4_rules_init(net); | |
988 | if (err < 0) | |
989 | goto fail; | |
990 | return 0; | |
991 | ||
992 | fail: | |
993 | kfree(net->ipv4.fib_table_hash); | |
994 | return err; | |
995 | } | |
996 | ||
997 | static void __net_exit ip_fib_net_exit(struct net *net) | |
998 | { | |
999 | unsigned int i; | |
1000 | ||
1001 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
1002 | fib4_rules_exit(net); | |
1003 | #endif | |
1004 | ||
1005 | for (i = 0; i < FIB_TABLE_HASHSZ; i++) { | |
1006 | struct fib_table *tb; | |
1007 | struct hlist_head *head; | |
1008 | struct hlist_node *node, *tmp; | |
1009 | ||
1010 | head = &net->ipv4.fib_table_hash[i]; | |
1011 | hlist_for_each_entry_safe(tb, node, tmp, head, tb_hlist) { | |
1012 | hlist_del(node); | |
1013 | tb->tb_flush(tb); | |
1014 | kfree(tb); | |
1015 | } | |
1016 | } | |
1017 | kfree(net->ipv4.fib_table_hash); | |
1018 | } | |
1019 | ||
1020 | static int __net_init fib_net_init(struct net *net) | |
1021 | { | |
1022 | int error; | |
1023 | ||
1024 | error = ip_fib_net_init(net); | |
1025 | if (error < 0) | |
1026 | goto out; | |
1027 | error = nl_fib_lookup_init(net); | |
1028 | if (error < 0) | |
1029 | goto out_nlfl; | |
1030 | error = fib_proc_init(net); | |
1031 | if (error < 0) | |
1032 | goto out_proc; | |
1033 | out: | |
1034 | return error; | |
1035 | ||
1036 | out_proc: | |
1037 | nl_fib_lookup_exit(net); | |
1038 | out_nlfl: | |
1039 | ip_fib_net_exit(net); | |
1040 | goto out; | |
1041 | } | |
1042 | ||
1043 | static void __net_exit fib_net_exit(struct net *net) | |
1044 | { | |
1045 | fib_proc_exit(net); | |
1046 | nl_fib_lookup_exit(net); | |
1047 | ip_fib_net_exit(net); | |
1048 | } | |
1049 | ||
1050 | static struct pernet_operations fib_net_ops = { | |
1051 | .init = fib_net_init, | |
1052 | .exit = fib_net_exit, | |
1053 | }; | |
1054 | ||
1055 | void __init ip_fib_init(void) | |
1056 | { | |
1057 | rtnl_register(PF_INET, RTM_NEWROUTE, inet_rtm_newroute, NULL); | |
1058 | rtnl_register(PF_INET, RTM_DELROUTE, inet_rtm_delroute, NULL); | |
1059 | rtnl_register(PF_INET, RTM_GETROUTE, NULL, inet_dump_fib); | |
1060 | ||
1061 | register_pernet_subsys(&fib_net_ops); | |
1062 | register_netdevice_notifier(&fib_netdev_notifier); | |
1063 | register_inetaddr_notifier(&fib_inetaddr_notifier); | |
1064 | ||
1065 | fib_hash_init(); | |
1066 | } | |
1067 | ||
1068 | EXPORT_SYMBOL(inet_addr_type); | |
1069 | EXPORT_SYMBOL(inet_dev_addr_type); | |
1070 | EXPORT_SYMBOL(ip_dev_find); |