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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 | #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 | ||
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 | fib_table_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 += 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 | |
157 | */ | |
158 | struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref) | |
159 | { | |
160 | struct flowi fl = { | |
161 | .nl_u = { | |
162 | .ip4_u = { | |
163 | .daddr = addr | |
164 | } | |
165 | }, | |
166 | .flags = FLOWI_FLAG_MATCH_ANY_IIF | |
167 | }; | |
168 | struct fib_result res = { 0 }; | |
169 | struct net_device *dev = NULL; | |
170 | ||
171 | if (fib_lookup(net, &fl, &res)) | |
172 | return NULL; | |
173 | if (res.type != RTN_LOCAL) | |
174 | goto out; | |
175 | dev = FIB_RES_DEV(res); | |
176 | ||
177 | if (dev && devref) | |
178 | dev_hold(dev); | |
179 | out: | |
180 | fib_res_put(&res); | |
181 | return dev; | |
182 | } | |
183 | EXPORT_SYMBOL(__ip_dev_find); | |
184 | ||
185 | /* | |
186 | * Find address type as if only "dev" was present in the system. If | |
187 | * on_dev is NULL then all interfaces are taken into consideration. | |
188 | */ | |
189 | static inline unsigned __inet_dev_addr_type(struct net *net, | |
190 | const struct net_device *dev, | |
191 | __be32 addr) | |
192 | { | |
193 | struct flowi fl = { .nl_u = { .ip4_u = { .daddr = addr } } }; | |
194 | struct fib_result res; | |
195 | unsigned ret = RTN_BROADCAST; | |
196 | struct fib_table *local_table; | |
197 | ||
198 | if (ipv4_is_zeronet(addr) || ipv4_is_lbcast(addr)) | |
199 | return RTN_BROADCAST; | |
200 | if (ipv4_is_multicast(addr)) | |
201 | return RTN_MULTICAST; | |
202 | ||
203 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
204 | res.r = NULL; | |
205 | #endif | |
206 | ||
207 | local_table = fib_get_table(net, RT_TABLE_LOCAL); | |
208 | if (local_table) { | |
209 | ret = RTN_UNICAST; | |
210 | if (!fib_table_lookup(local_table, &fl, &res)) { | |
211 | if (!dev || dev == res.fi->fib_dev) | |
212 | ret = res.type; | |
213 | fib_res_put(&res); | |
214 | } | |
215 | } | |
216 | return ret; | |
217 | } | |
218 | ||
219 | unsigned int inet_addr_type(struct net *net, __be32 addr) | |
220 | { | |
221 | return __inet_dev_addr_type(net, NULL, addr); | |
222 | } | |
223 | EXPORT_SYMBOL(inet_addr_type); | |
224 | ||
225 | unsigned 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 | } | |
230 | EXPORT_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 | */ | |
239 | int fib_validate_source(__be32 src, __be32 dst, u8 tos, int oif, | |
240 | struct net_device *dev, __be32 *spec_dst, | |
241 | u32 *itag, u32 mark) | |
242 | { | |
243 | struct in_device *in_dev; | |
244 | struct flowi fl = { | |
245 | .nl_u = { | |
246 | .ip4_u = { | |
247 | .daddr = src, | |
248 | .saddr = dst, | |
249 | .tos = tos | |
250 | } | |
251 | }, | |
252 | .mark = mark, | |
253 | .iif = oif | |
254 | }; | |
255 | struct fib_result res; | |
256 | int no_addr, rpf, accept_local; | |
257 | bool dev_match; | |
258 | int ret; | |
259 | struct net *net; | |
260 | ||
261 | no_addr = rpf = accept_local = 0; | |
262 | rcu_read_lock(); | |
263 | in_dev = __in_dev_get_rcu(dev); | |
264 | if (in_dev) { | |
265 | no_addr = in_dev->ifa_list == NULL; | |
266 | rpf = IN_DEV_RPFILTER(in_dev); | |
267 | accept_local = IN_DEV_ACCEPT_LOCAL(in_dev); | |
268 | if (mark && !IN_DEV_SRC_VMARK(in_dev)) | |
269 | fl.mark = 0; | |
270 | } | |
271 | rcu_read_unlock(); | |
272 | ||
273 | if (in_dev == NULL) | |
274 | goto e_inval; | |
275 | ||
276 | net = dev_net(dev); | |
277 | if (fib_lookup(net, &fl, &res)) | |
278 | goto last_resort; | |
279 | if (res.type != RTN_UNICAST) { | |
280 | if (res.type != RTN_LOCAL || !accept_local) | |
281 | goto e_inval_res; | |
282 | } | |
283 | *spec_dst = FIB_RES_PREFSRC(res); | |
284 | fib_combine_itag(itag, &res); | |
285 | dev_match = false; | |
286 | ||
287 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
288 | for (ret = 0; ret < res.fi->fib_nhs; ret++) { | |
289 | struct fib_nh *nh = &res.fi->fib_nh[ret]; | |
290 | ||
291 | if (nh->nh_dev == dev) { | |
292 | dev_match = true; | |
293 | break; | |
294 | } | |
295 | } | |
296 | #else | |
297 | if (FIB_RES_DEV(res) == dev) | |
298 | dev_match = true; | |
299 | #endif | |
300 | if (dev_match) { | |
301 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; | |
302 | fib_res_put(&res); | |
303 | return ret; | |
304 | } | |
305 | fib_res_put(&res); | |
306 | if (no_addr) | |
307 | goto last_resort; | |
308 | if (rpf == 1) | |
309 | goto e_rpf; | |
310 | fl.oif = dev->ifindex; | |
311 | ||
312 | ret = 0; | |
313 | if (fib_lookup(net, &fl, &res) == 0) { | |
314 | if (res.type == RTN_UNICAST) { | |
315 | *spec_dst = FIB_RES_PREFSRC(res); | |
316 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; | |
317 | } | |
318 | fib_res_put(&res); | |
319 | } | |
320 | return ret; | |
321 | ||
322 | last_resort: | |
323 | if (rpf) | |
324 | goto e_rpf; | |
325 | *spec_dst = inet_select_addr(dev, 0, RT_SCOPE_UNIVERSE); | |
326 | *itag = 0; | |
327 | return 0; | |
328 | ||
329 | e_inval_res: | |
330 | fib_res_put(&res); | |
331 | e_inval: | |
332 | return -EINVAL; | |
333 | e_rpf: | |
334 | return -EXDEV; | |
335 | } | |
336 | ||
337 | static inline __be32 sk_extract_addr(struct sockaddr *addr) | |
338 | { | |
339 | return ((struct sockaddr_in *) addr)->sin_addr.s_addr; | |
340 | } | |
341 | ||
342 | static int put_rtax(struct nlattr *mx, int len, int type, u32 value) | |
343 | { | |
344 | struct nlattr *nla; | |
345 | ||
346 | nla = (struct nlattr *) ((char *) mx + len); | |
347 | nla->nla_type = type; | |
348 | nla->nla_len = nla_attr_size(4); | |
349 | *(u32 *) nla_data(nla) = value; | |
350 | ||
351 | return len + nla_total_size(4); | |
352 | } | |
353 | ||
354 | static int rtentry_to_fib_config(struct net *net, int cmd, struct rtentry *rt, | |
355 | struct fib_config *cfg) | |
356 | { | |
357 | __be32 addr; | |
358 | int plen; | |
359 | ||
360 | memset(cfg, 0, sizeof(*cfg)); | |
361 | cfg->fc_nlinfo.nl_net = net; | |
362 | ||
363 | if (rt->rt_dst.sa_family != AF_INET) | |
364 | return -EAFNOSUPPORT; | |
365 | ||
366 | /* | |
367 | * Check mask for validity: | |
368 | * a) it must be contiguous. | |
369 | * b) destination must have all host bits clear. | |
370 | * c) if application forgot to set correct family (AF_INET), | |
371 | * reject request unless it is absolutely clear i.e. | |
372 | * both family and mask are zero. | |
373 | */ | |
374 | plen = 32; | |
375 | addr = sk_extract_addr(&rt->rt_dst); | |
376 | if (!(rt->rt_flags & RTF_HOST)) { | |
377 | __be32 mask = sk_extract_addr(&rt->rt_genmask); | |
378 | ||
379 | if (rt->rt_genmask.sa_family != AF_INET) { | |
380 | if (mask || rt->rt_genmask.sa_family) | |
381 | return -EAFNOSUPPORT; | |
382 | } | |
383 | ||
384 | if (bad_mask(mask, addr)) | |
385 | return -EINVAL; | |
386 | ||
387 | plen = inet_mask_len(mask); | |
388 | } | |
389 | ||
390 | cfg->fc_dst_len = plen; | |
391 | cfg->fc_dst = addr; | |
392 | ||
393 | if (cmd != SIOCDELRT) { | |
394 | cfg->fc_nlflags = NLM_F_CREATE; | |
395 | cfg->fc_protocol = RTPROT_BOOT; | |
396 | } | |
397 | ||
398 | if (rt->rt_metric) | |
399 | cfg->fc_priority = rt->rt_metric - 1; | |
400 | ||
401 | if (rt->rt_flags & RTF_REJECT) { | |
402 | cfg->fc_scope = RT_SCOPE_HOST; | |
403 | cfg->fc_type = RTN_UNREACHABLE; | |
404 | return 0; | |
405 | } | |
406 | ||
407 | cfg->fc_scope = RT_SCOPE_NOWHERE; | |
408 | cfg->fc_type = RTN_UNICAST; | |
409 | ||
410 | if (rt->rt_dev) { | |
411 | char *colon; | |
412 | struct net_device *dev; | |
413 | char devname[IFNAMSIZ]; | |
414 | ||
415 | if (copy_from_user(devname, rt->rt_dev, IFNAMSIZ-1)) | |
416 | return -EFAULT; | |
417 | ||
418 | devname[IFNAMSIZ-1] = 0; | |
419 | colon = strchr(devname, ':'); | |
420 | if (colon) | |
421 | *colon = 0; | |
422 | dev = __dev_get_by_name(net, devname); | |
423 | if (!dev) | |
424 | return -ENODEV; | |
425 | cfg->fc_oif = dev->ifindex; | |
426 | if (colon) { | |
427 | struct in_ifaddr *ifa; | |
428 | struct in_device *in_dev = __in_dev_get_rtnl(dev); | |
429 | if (!in_dev) | |
430 | return -ENODEV; | |
431 | *colon = ':'; | |
432 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) | |
433 | if (strcmp(ifa->ifa_label, devname) == 0) | |
434 | break; | |
435 | if (ifa == NULL) | |
436 | return -ENODEV; | |
437 | cfg->fc_prefsrc = ifa->ifa_local; | |
438 | } | |
439 | } | |
440 | ||
441 | addr = sk_extract_addr(&rt->rt_gateway); | |
442 | if (rt->rt_gateway.sa_family == AF_INET && addr) { | |
443 | cfg->fc_gw = addr; | |
444 | if (rt->rt_flags & RTF_GATEWAY && | |
445 | inet_addr_type(net, addr) == RTN_UNICAST) | |
446 | cfg->fc_scope = RT_SCOPE_UNIVERSE; | |
447 | } | |
448 | ||
449 | if (cmd == SIOCDELRT) | |
450 | return 0; | |
451 | ||
452 | if (rt->rt_flags & RTF_GATEWAY && !cfg->fc_gw) | |
453 | return -EINVAL; | |
454 | ||
455 | if (cfg->fc_scope == RT_SCOPE_NOWHERE) | |
456 | cfg->fc_scope = RT_SCOPE_LINK; | |
457 | ||
458 | if (rt->rt_flags & (RTF_MTU | RTF_WINDOW | RTF_IRTT)) { | |
459 | struct nlattr *mx; | |
460 | int len = 0; | |
461 | ||
462 | mx = kzalloc(3 * nla_total_size(4), GFP_KERNEL); | |
463 | if (mx == NULL) | |
464 | return -ENOMEM; | |
465 | ||
466 | if (rt->rt_flags & RTF_MTU) | |
467 | len = put_rtax(mx, len, RTAX_ADVMSS, rt->rt_mtu - 40); | |
468 | ||
469 | if (rt->rt_flags & RTF_WINDOW) | |
470 | len = put_rtax(mx, len, RTAX_WINDOW, rt->rt_window); | |
471 | ||
472 | if (rt->rt_flags & RTF_IRTT) | |
473 | len = put_rtax(mx, len, RTAX_RTT, rt->rt_irtt << 3); | |
474 | ||
475 | cfg->fc_mx = mx; | |
476 | cfg->fc_mx_len = len; | |
477 | } | |
478 | ||
479 | return 0; | |
480 | } | |
481 | ||
482 | /* | |
483 | * Handle IP routing ioctl calls. | |
484 | * These are used to manipulate the routing tables | |
485 | */ | |
486 | int ip_rt_ioctl(struct net *net, unsigned int cmd, void __user *arg) | |
487 | { | |
488 | struct fib_config cfg; | |
489 | struct rtentry rt; | |
490 | int err; | |
491 | ||
492 | switch (cmd) { | |
493 | case SIOCADDRT: /* Add a route */ | |
494 | case SIOCDELRT: /* Delete a route */ | |
495 | if (!capable(CAP_NET_ADMIN)) | |
496 | return -EPERM; | |
497 | ||
498 | if (copy_from_user(&rt, arg, sizeof(rt))) | |
499 | return -EFAULT; | |
500 | ||
501 | rtnl_lock(); | |
502 | err = rtentry_to_fib_config(net, cmd, &rt, &cfg); | |
503 | if (err == 0) { | |
504 | struct fib_table *tb; | |
505 | ||
506 | if (cmd == SIOCDELRT) { | |
507 | tb = fib_get_table(net, cfg.fc_table); | |
508 | if (tb) | |
509 | err = fib_table_delete(tb, &cfg); | |
510 | else | |
511 | err = -ESRCH; | |
512 | } else { | |
513 | tb = fib_new_table(net, cfg.fc_table); | |
514 | if (tb) | |
515 | err = fib_table_insert(tb, &cfg); | |
516 | else | |
517 | err = -ENOBUFS; | |
518 | } | |
519 | ||
520 | /* allocated by rtentry_to_fib_config() */ | |
521 | kfree(cfg.fc_mx); | |
522 | } | |
523 | rtnl_unlock(); | |
524 | return err; | |
525 | } | |
526 | return -EINVAL; | |
527 | } | |
528 | ||
529 | const struct nla_policy rtm_ipv4_policy[RTA_MAX + 1] = { | |
530 | [RTA_DST] = { .type = NLA_U32 }, | |
531 | [RTA_SRC] = { .type = NLA_U32 }, | |
532 | [RTA_IIF] = { .type = NLA_U32 }, | |
533 | [RTA_OIF] = { .type = NLA_U32 }, | |
534 | [RTA_GATEWAY] = { .type = NLA_U32 }, | |
535 | [RTA_PRIORITY] = { .type = NLA_U32 }, | |
536 | [RTA_PREFSRC] = { .type = NLA_U32 }, | |
537 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
538 | [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, | |
539 | [RTA_FLOW] = { .type = NLA_U32 }, | |
540 | }; | |
541 | ||
542 | static int rtm_to_fib_config(struct net *net, struct sk_buff *skb, | |
543 | struct nlmsghdr *nlh, struct fib_config *cfg) | |
544 | { | |
545 | struct nlattr *attr; | |
546 | int err, remaining; | |
547 | struct rtmsg *rtm; | |
548 | ||
549 | err = nlmsg_validate(nlh, sizeof(*rtm), RTA_MAX, rtm_ipv4_policy); | |
550 | if (err < 0) | |
551 | goto errout; | |
552 | ||
553 | memset(cfg, 0, sizeof(*cfg)); | |
554 | ||
555 | rtm = nlmsg_data(nlh); | |
556 | cfg->fc_dst_len = rtm->rtm_dst_len; | |
557 | cfg->fc_tos = rtm->rtm_tos; | |
558 | cfg->fc_table = rtm->rtm_table; | |
559 | cfg->fc_protocol = rtm->rtm_protocol; | |
560 | cfg->fc_scope = rtm->rtm_scope; | |
561 | cfg->fc_type = rtm->rtm_type; | |
562 | cfg->fc_flags = rtm->rtm_flags; | |
563 | cfg->fc_nlflags = nlh->nlmsg_flags; | |
564 | ||
565 | cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid; | |
566 | cfg->fc_nlinfo.nlh = nlh; | |
567 | cfg->fc_nlinfo.nl_net = net; | |
568 | ||
569 | if (cfg->fc_type > RTN_MAX) { | |
570 | err = -EINVAL; | |
571 | goto errout; | |
572 | } | |
573 | ||
574 | nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), remaining) { | |
575 | switch (nla_type(attr)) { | |
576 | case RTA_DST: | |
577 | cfg->fc_dst = nla_get_be32(attr); | |
578 | break; | |
579 | case RTA_OIF: | |
580 | cfg->fc_oif = nla_get_u32(attr); | |
581 | break; | |
582 | case RTA_GATEWAY: | |
583 | cfg->fc_gw = nla_get_be32(attr); | |
584 | break; | |
585 | case RTA_PRIORITY: | |
586 | cfg->fc_priority = nla_get_u32(attr); | |
587 | break; | |
588 | case RTA_PREFSRC: | |
589 | cfg->fc_prefsrc = nla_get_be32(attr); | |
590 | break; | |
591 | case RTA_METRICS: | |
592 | cfg->fc_mx = nla_data(attr); | |
593 | cfg->fc_mx_len = nla_len(attr); | |
594 | break; | |
595 | case RTA_MULTIPATH: | |
596 | cfg->fc_mp = nla_data(attr); | |
597 | cfg->fc_mp_len = nla_len(attr); | |
598 | break; | |
599 | case RTA_FLOW: | |
600 | cfg->fc_flow = nla_get_u32(attr); | |
601 | break; | |
602 | case RTA_TABLE: | |
603 | cfg->fc_table = nla_get_u32(attr); | |
604 | break; | |
605 | } | |
606 | } | |
607 | ||
608 | return 0; | |
609 | errout: | |
610 | return err; | |
611 | } | |
612 | ||
613 | static int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) | |
614 | { | |
615 | struct net *net = sock_net(skb->sk); | |
616 | struct fib_config cfg; | |
617 | struct fib_table *tb; | |
618 | int err; | |
619 | ||
620 | err = rtm_to_fib_config(net, skb, nlh, &cfg); | |
621 | if (err < 0) | |
622 | goto errout; | |
623 | ||
624 | tb = fib_get_table(net, cfg.fc_table); | |
625 | if (tb == NULL) { | |
626 | err = -ESRCH; | |
627 | goto errout; | |
628 | } | |
629 | ||
630 | err = fib_table_delete(tb, &cfg); | |
631 | errout: | |
632 | return err; | |
633 | } | |
634 | ||
635 | static int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) | |
636 | { | |
637 | struct net *net = sock_net(skb->sk); | |
638 | struct fib_config cfg; | |
639 | struct fib_table *tb; | |
640 | int err; | |
641 | ||
642 | err = rtm_to_fib_config(net, skb, nlh, &cfg); | |
643 | if (err < 0) | |
644 | goto errout; | |
645 | ||
646 | tb = fib_new_table(net, cfg.fc_table); | |
647 | if (tb == NULL) { | |
648 | err = -ENOBUFS; | |
649 | goto errout; | |
650 | } | |
651 | ||
652 | err = fib_table_insert(tb, &cfg); | |
653 | errout: | |
654 | return err; | |
655 | } | |
656 | ||
657 | static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb) | |
658 | { | |
659 | struct net *net = sock_net(skb->sk); | |
660 | unsigned int h, s_h; | |
661 | unsigned int e = 0, s_e; | |
662 | struct fib_table *tb; | |
663 | struct hlist_node *node; | |
664 | struct hlist_head *head; | |
665 | int dumped = 0; | |
666 | ||
667 | if (nlmsg_len(cb->nlh) >= sizeof(struct rtmsg) && | |
668 | ((struct rtmsg *) nlmsg_data(cb->nlh))->rtm_flags & RTM_F_CLONED) | |
669 | return ip_rt_dump(skb, cb); | |
670 | ||
671 | s_h = cb->args[0]; | |
672 | s_e = cb->args[1]; | |
673 | ||
674 | for (h = s_h; h < FIB_TABLE_HASHSZ; h++, s_e = 0) { | |
675 | e = 0; | |
676 | head = &net->ipv4.fib_table_hash[h]; | |
677 | hlist_for_each_entry(tb, node, head, tb_hlist) { | |
678 | if (e < s_e) | |
679 | goto next; | |
680 | if (dumped) | |
681 | memset(&cb->args[2], 0, sizeof(cb->args) - | |
682 | 2 * sizeof(cb->args[0])); | |
683 | if (fib_table_dump(tb, skb, cb) < 0) | |
684 | goto out; | |
685 | dumped = 1; | |
686 | next: | |
687 | e++; | |
688 | } | |
689 | } | |
690 | out: | |
691 | cb->args[1] = e; | |
692 | cb->args[0] = h; | |
693 | ||
694 | return skb->len; | |
695 | } | |
696 | ||
697 | /* Prepare and feed intra-kernel routing request. | |
698 | * Really, it should be netlink message, but :-( netlink | |
699 | * can be not configured, so that we feed it directly | |
700 | * to fib engine. It is legal, because all events occur | |
701 | * only when netlink is already locked. | |
702 | */ | |
703 | static void fib_magic(int cmd, int type, __be32 dst, int dst_len, struct in_ifaddr *ifa) | |
704 | { | |
705 | struct net *net = dev_net(ifa->ifa_dev->dev); | |
706 | struct fib_table *tb; | |
707 | struct fib_config cfg = { | |
708 | .fc_protocol = RTPROT_KERNEL, | |
709 | .fc_type = type, | |
710 | .fc_dst = dst, | |
711 | .fc_dst_len = dst_len, | |
712 | .fc_prefsrc = ifa->ifa_local, | |
713 | .fc_oif = ifa->ifa_dev->dev->ifindex, | |
714 | .fc_nlflags = NLM_F_CREATE | NLM_F_APPEND, | |
715 | .fc_nlinfo = { | |
716 | .nl_net = net, | |
717 | }, | |
718 | }; | |
719 | ||
720 | if (type == RTN_UNICAST) | |
721 | tb = fib_new_table(net, RT_TABLE_MAIN); | |
722 | else | |
723 | tb = fib_new_table(net, RT_TABLE_LOCAL); | |
724 | ||
725 | if (tb == NULL) | |
726 | return; | |
727 | ||
728 | cfg.fc_table = tb->tb_id; | |
729 | ||
730 | if (type != RTN_LOCAL) | |
731 | cfg.fc_scope = RT_SCOPE_LINK; | |
732 | else | |
733 | cfg.fc_scope = RT_SCOPE_HOST; | |
734 | ||
735 | if (cmd == RTM_NEWROUTE) | |
736 | fib_table_insert(tb, &cfg); | |
737 | else | |
738 | fib_table_delete(tb, &cfg); | |
739 | } | |
740 | ||
741 | void fib_add_ifaddr(struct in_ifaddr *ifa) | |
742 | { | |
743 | struct in_device *in_dev = ifa->ifa_dev; | |
744 | struct net_device *dev = in_dev->dev; | |
745 | struct in_ifaddr *prim = ifa; | |
746 | __be32 mask = ifa->ifa_mask; | |
747 | __be32 addr = ifa->ifa_local; | |
748 | __be32 prefix = ifa->ifa_address & mask; | |
749 | ||
750 | if (ifa->ifa_flags & IFA_F_SECONDARY) { | |
751 | prim = inet_ifa_byprefix(in_dev, prefix, mask); | |
752 | if (prim == NULL) { | |
753 | printk(KERN_WARNING "fib_add_ifaddr: bug: prim == NULL\n"); | |
754 | return; | |
755 | } | |
756 | } | |
757 | ||
758 | fib_magic(RTM_NEWROUTE, RTN_LOCAL, addr, 32, prim); | |
759 | ||
760 | if (!(dev->flags & IFF_UP)) | |
761 | return; | |
762 | ||
763 | /* Add broadcast address, if it is explicitly assigned. */ | |
764 | if (ifa->ifa_broadcast && ifa->ifa_broadcast != htonl(0xFFFFFFFF)) | |
765 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); | |
766 | ||
767 | if (!ipv4_is_zeronet(prefix) && !(ifa->ifa_flags & IFA_F_SECONDARY) && | |
768 | (prefix != addr || ifa->ifa_prefixlen < 32)) { | |
769 | fib_magic(RTM_NEWROUTE, | |
770 | dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST, | |
771 | prefix, ifa->ifa_prefixlen, prim); | |
772 | ||
773 | /* Add network specific broadcasts, when it takes a sense */ | |
774 | if (ifa->ifa_prefixlen < 31) { | |
775 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix, 32, prim); | |
776 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix | ~mask, | |
777 | 32, prim); | |
778 | } | |
779 | } | |
780 | } | |
781 | ||
782 | static void fib_del_ifaddr(struct in_ifaddr *ifa) | |
783 | { | |
784 | struct in_device *in_dev = ifa->ifa_dev; | |
785 | struct net_device *dev = in_dev->dev; | |
786 | struct in_ifaddr *ifa1; | |
787 | struct in_ifaddr *prim = ifa; | |
788 | __be32 brd = ifa->ifa_address | ~ifa->ifa_mask; | |
789 | __be32 any = ifa->ifa_address & ifa->ifa_mask; | |
790 | #define LOCAL_OK 1 | |
791 | #define BRD_OK 2 | |
792 | #define BRD0_OK 4 | |
793 | #define BRD1_OK 8 | |
794 | unsigned ok = 0; | |
795 | ||
796 | if (!(ifa->ifa_flags & IFA_F_SECONDARY)) | |
797 | fib_magic(RTM_DELROUTE, | |
798 | dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST, | |
799 | any, ifa->ifa_prefixlen, prim); | |
800 | else { | |
801 | prim = inet_ifa_byprefix(in_dev, any, ifa->ifa_mask); | |
802 | if (prim == NULL) { | |
803 | printk(KERN_WARNING "fib_del_ifaddr: bug: prim == NULL\n"); | |
804 | return; | |
805 | } | |
806 | } | |
807 | ||
808 | /* Deletion is more complicated than add. | |
809 | * We should take care of not to delete too much :-) | |
810 | * | |
811 | * Scan address list to be sure that addresses are really gone. | |
812 | */ | |
813 | ||
814 | for (ifa1 = in_dev->ifa_list; ifa1; ifa1 = ifa1->ifa_next) { | |
815 | if (ifa->ifa_local == ifa1->ifa_local) | |
816 | ok |= LOCAL_OK; | |
817 | if (ifa->ifa_broadcast == ifa1->ifa_broadcast) | |
818 | ok |= BRD_OK; | |
819 | if (brd == ifa1->ifa_broadcast) | |
820 | ok |= BRD1_OK; | |
821 | if (any == ifa1->ifa_broadcast) | |
822 | ok |= BRD0_OK; | |
823 | } | |
824 | ||
825 | if (!(ok & BRD_OK)) | |
826 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); | |
827 | if (!(ok & BRD1_OK)) | |
828 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, brd, 32, prim); | |
829 | if (!(ok & BRD0_OK)) | |
830 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, any, 32, prim); | |
831 | if (!(ok & LOCAL_OK)) { | |
832 | fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 32, prim); | |
833 | ||
834 | /* Check, that this local address finally disappeared. */ | |
835 | if (inet_addr_type(dev_net(dev), ifa->ifa_local) != RTN_LOCAL) { | |
836 | /* And the last, but not the least thing. | |
837 | * We must flush stray FIB entries. | |
838 | * | |
839 | * First of all, we scan fib_info list searching | |
840 | * for stray nexthop entries, then ignite fib_flush. | |
841 | */ | |
842 | if (fib_sync_down_addr(dev_net(dev), ifa->ifa_local)) | |
843 | fib_flush(dev_net(dev)); | |
844 | } | |
845 | } | |
846 | #undef LOCAL_OK | |
847 | #undef BRD_OK | |
848 | #undef BRD0_OK | |
849 | #undef BRD1_OK | |
850 | } | |
851 | ||
852 | static void nl_fib_lookup(struct fib_result_nl *frn, struct fib_table *tb) | |
853 | { | |
854 | ||
855 | struct fib_result res; | |
856 | struct flowi fl = { | |
857 | .mark = frn->fl_mark, | |
858 | .nl_u = { | |
859 | .ip4_u = { | |
860 | .daddr = frn->fl_addr, | |
861 | .tos = frn->fl_tos, | |
862 | .scope = frn->fl_scope | |
863 | } | |
864 | } | |
865 | }; | |
866 | ||
867 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
868 | res.r = NULL; | |
869 | #endif | |
870 | ||
871 | frn->err = -ENOENT; | |
872 | if (tb) { | |
873 | local_bh_disable(); | |
874 | ||
875 | frn->tb_id = tb->tb_id; | |
876 | frn->err = fib_table_lookup(tb, &fl, &res); | |
877 | ||
878 | if (!frn->err) { | |
879 | frn->prefixlen = res.prefixlen; | |
880 | frn->nh_sel = res.nh_sel; | |
881 | frn->type = res.type; | |
882 | frn->scope = res.scope; | |
883 | fib_res_put(&res); | |
884 | } | |
885 | local_bh_enable(); | |
886 | } | |
887 | } | |
888 | ||
889 | static void nl_fib_input(struct sk_buff *skb) | |
890 | { | |
891 | struct net *net; | |
892 | struct fib_result_nl *frn; | |
893 | struct nlmsghdr *nlh; | |
894 | struct fib_table *tb; | |
895 | u32 pid; | |
896 | ||
897 | net = sock_net(skb->sk); | |
898 | nlh = nlmsg_hdr(skb); | |
899 | if (skb->len < NLMSG_SPACE(0) || skb->len < nlh->nlmsg_len || | |
900 | nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*frn))) | |
901 | return; | |
902 | ||
903 | skb = skb_clone(skb, GFP_KERNEL); | |
904 | if (skb == NULL) | |
905 | return; | |
906 | nlh = nlmsg_hdr(skb); | |
907 | ||
908 | frn = (struct fib_result_nl *) NLMSG_DATA(nlh); | |
909 | tb = fib_get_table(net, frn->tb_id_in); | |
910 | ||
911 | nl_fib_lookup(frn, tb); | |
912 | ||
913 | pid = NETLINK_CB(skb).pid; /* pid of sending process */ | |
914 | NETLINK_CB(skb).pid = 0; /* from kernel */ | |
915 | NETLINK_CB(skb).dst_group = 0; /* unicast */ | |
916 | netlink_unicast(net->ipv4.fibnl, skb, pid, MSG_DONTWAIT); | |
917 | } | |
918 | ||
919 | static int __net_init nl_fib_lookup_init(struct net *net) | |
920 | { | |
921 | struct sock *sk; | |
922 | sk = netlink_kernel_create(net, NETLINK_FIB_LOOKUP, 0, | |
923 | nl_fib_input, NULL, THIS_MODULE); | |
924 | if (sk == NULL) | |
925 | return -EAFNOSUPPORT; | |
926 | net->ipv4.fibnl = sk; | |
927 | return 0; | |
928 | } | |
929 | ||
930 | static void nl_fib_lookup_exit(struct net *net) | |
931 | { | |
932 | netlink_kernel_release(net->ipv4.fibnl); | |
933 | net->ipv4.fibnl = NULL; | |
934 | } | |
935 | ||
936 | static void fib_disable_ip(struct net_device *dev, int force, int delay) | |
937 | { | |
938 | if (fib_sync_down_dev(dev, force)) | |
939 | fib_flush(dev_net(dev)); | |
940 | rt_cache_flush(dev_net(dev), delay); | |
941 | arp_ifdown(dev); | |
942 | } | |
943 | ||
944 | static int fib_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr) | |
945 | { | |
946 | struct in_ifaddr *ifa = (struct in_ifaddr *)ptr; | |
947 | struct net_device *dev = ifa->ifa_dev->dev; | |
948 | ||
949 | switch (event) { | |
950 | case NETDEV_UP: | |
951 | fib_add_ifaddr(ifa); | |
952 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
953 | fib_sync_up(dev); | |
954 | #endif | |
955 | rt_cache_flush(dev_net(dev), -1); | |
956 | break; | |
957 | case NETDEV_DOWN: | |
958 | fib_del_ifaddr(ifa); | |
959 | if (ifa->ifa_dev->ifa_list == NULL) { | |
960 | /* Last address was deleted from this interface. | |
961 | * Disable IP. | |
962 | */ | |
963 | fib_disable_ip(dev, 1, 0); | |
964 | } else { | |
965 | rt_cache_flush(dev_net(dev), -1); | |
966 | } | |
967 | break; | |
968 | } | |
969 | return NOTIFY_DONE; | |
970 | } | |
971 | ||
972 | static int fib_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
973 | { | |
974 | struct net_device *dev = ptr; | |
975 | struct in_device *in_dev = __in_dev_get_rtnl(dev); | |
976 | ||
977 | if (event == NETDEV_UNREGISTER) { | |
978 | fib_disable_ip(dev, 2, -1); | |
979 | return NOTIFY_DONE; | |
980 | } | |
981 | ||
982 | if (!in_dev) | |
983 | return NOTIFY_DONE; | |
984 | ||
985 | switch (event) { | |
986 | case NETDEV_UP: | |
987 | for_ifa(in_dev) { | |
988 | fib_add_ifaddr(ifa); | |
989 | } endfor_ifa(in_dev); | |
990 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
991 | fib_sync_up(dev); | |
992 | #endif | |
993 | rt_cache_flush(dev_net(dev), -1); | |
994 | break; | |
995 | case NETDEV_DOWN: | |
996 | fib_disable_ip(dev, 0, 0); | |
997 | break; | |
998 | case NETDEV_CHANGEMTU: | |
999 | case NETDEV_CHANGE: | |
1000 | rt_cache_flush(dev_net(dev), 0); | |
1001 | break; | |
1002 | case NETDEV_UNREGISTER_BATCH: | |
1003 | rt_cache_flush_batch(); | |
1004 | break; | |
1005 | } | |
1006 | return NOTIFY_DONE; | |
1007 | } | |
1008 | ||
1009 | static struct notifier_block fib_inetaddr_notifier = { | |
1010 | .notifier_call = fib_inetaddr_event, | |
1011 | }; | |
1012 | ||
1013 | static struct notifier_block fib_netdev_notifier = { | |
1014 | .notifier_call = fib_netdev_event, | |
1015 | }; | |
1016 | ||
1017 | static int __net_init ip_fib_net_init(struct net *net) | |
1018 | { | |
1019 | int err; | |
1020 | unsigned int i; | |
1021 | ||
1022 | net->ipv4.fib_table_hash = kzalloc( | |
1023 | sizeof(struct hlist_head)*FIB_TABLE_HASHSZ, GFP_KERNEL); | |
1024 | if (net->ipv4.fib_table_hash == NULL) | |
1025 | return -ENOMEM; | |
1026 | ||
1027 | for (i = 0; i < FIB_TABLE_HASHSZ; i++) | |
1028 | INIT_HLIST_HEAD(&net->ipv4.fib_table_hash[i]); | |
1029 | ||
1030 | err = fib4_rules_init(net); | |
1031 | if (err < 0) | |
1032 | goto fail; | |
1033 | return 0; | |
1034 | ||
1035 | fail: | |
1036 | kfree(net->ipv4.fib_table_hash); | |
1037 | return err; | |
1038 | } | |
1039 | ||
1040 | static void ip_fib_net_exit(struct net *net) | |
1041 | { | |
1042 | unsigned int i; | |
1043 | ||
1044 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
1045 | fib4_rules_exit(net); | |
1046 | #endif | |
1047 | ||
1048 | for (i = 0; i < FIB_TABLE_HASHSZ; i++) { | |
1049 | struct fib_table *tb; | |
1050 | struct hlist_head *head; | |
1051 | struct hlist_node *node, *tmp; | |
1052 | ||
1053 | head = &net->ipv4.fib_table_hash[i]; | |
1054 | hlist_for_each_entry_safe(tb, node, tmp, head, tb_hlist) { | |
1055 | hlist_del(node); | |
1056 | fib_table_flush(tb); | |
1057 | kfree(tb); | |
1058 | } | |
1059 | } | |
1060 | kfree(net->ipv4.fib_table_hash); | |
1061 | } | |
1062 | ||
1063 | static int __net_init fib_net_init(struct net *net) | |
1064 | { | |
1065 | int error; | |
1066 | ||
1067 | error = ip_fib_net_init(net); | |
1068 | if (error < 0) | |
1069 | goto out; | |
1070 | error = nl_fib_lookup_init(net); | |
1071 | if (error < 0) | |
1072 | goto out_nlfl; | |
1073 | error = fib_proc_init(net); | |
1074 | if (error < 0) | |
1075 | goto out_proc; | |
1076 | out: | |
1077 | return error; | |
1078 | ||
1079 | out_proc: | |
1080 | nl_fib_lookup_exit(net); | |
1081 | out_nlfl: | |
1082 | ip_fib_net_exit(net); | |
1083 | goto out; | |
1084 | } | |
1085 | ||
1086 | static void __net_exit fib_net_exit(struct net *net) | |
1087 | { | |
1088 | fib_proc_exit(net); | |
1089 | nl_fib_lookup_exit(net); | |
1090 | ip_fib_net_exit(net); | |
1091 | } | |
1092 | ||
1093 | static struct pernet_operations fib_net_ops = { | |
1094 | .init = fib_net_init, | |
1095 | .exit = fib_net_exit, | |
1096 | }; | |
1097 | ||
1098 | void __init ip_fib_init(void) | |
1099 | { | |
1100 | rtnl_register(PF_INET, RTM_NEWROUTE, inet_rtm_newroute, NULL); | |
1101 | rtnl_register(PF_INET, RTM_DELROUTE, inet_rtm_delroute, NULL); | |
1102 | rtnl_register(PF_INET, RTM_GETROUTE, NULL, inet_dump_fib); | |
1103 | ||
1104 | register_pernet_subsys(&fib_net_ops); | |
1105 | register_netdevice_notifier(&fib_netdev_notifier); | |
1106 | register_inetaddr_notifier(&fib_inetaddr_notifier); | |
1107 | ||
1108 | fib_hash_init(); | |
1109 | } |