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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 <linux/bitops.h> |
19 | #include <linux/capability.h> |
20 | #include <linux/types.h> |
21 | #include <linux/kernel.h> |
22 | #include <linux/mm.h> |
23 | #include <linux/string.h> |
24 | #include <linux/socket.h> |
25 | #include <linux/sockios.h> |
26 | #include <linux/errno.h> |
27 | #include <linux/in.h> |
28 | #include <linux/inet.h> |
29 | #include <linux/inetdevice.h> |
30 | #include <linux/netdevice.h> |
31 | #include <linux/if_addr.h> |
32 | #include <linux/if_arp.h> |
33 | #include <linux/skbuff.h> |
34 | #include <linux/cache.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 | #include <net/xfrm.h> |
48 | |
49 | #ifndef CONFIG_IP_MULTIPLE_TABLES |
50 | |
51 | static int __net_init fib4_rules_init(struct net *net) |
52 | { |
53 | struct fib_table *local_table, *main_table; |
54 | |
55 | local_table = fib_trie_table(RT_TABLE_LOCAL); |
56 | if (local_table == NULL) |
57 | return -ENOMEM; |
58 | |
59 | main_table = fib_trie_table(RT_TABLE_MAIN); |
60 | if (main_table == NULL) |
61 | goto fail; |
62 | |
63 | hlist_add_head_rcu(&local_table->tb_hlist, |
64 | &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX]); |
65 | hlist_add_head_rcu(&main_table->tb_hlist, |
66 | &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX]); |
67 | return 0; |
68 | |
69 | fail: |
70 | kfree(local_table); |
71 | return -ENOMEM; |
72 | } |
73 | #else |
74 | |
75 | struct fib_table *fib_new_table(struct net *net, u32 id) |
76 | { |
77 | struct fib_table *tb; |
78 | unsigned int h; |
79 | |
80 | if (id == 0) |
81 | id = RT_TABLE_MAIN; |
82 | tb = fib_get_table(net, id); |
83 | if (tb) |
84 | return tb; |
85 | |
86 | tb = fib_trie_table(id); |
87 | if (!tb) |
88 | return NULL; |
89 | |
90 | switch (id) { |
91 | case RT_TABLE_LOCAL: |
92 | net->ipv4.fib_local = tb; |
93 | break; |
94 | |
95 | case RT_TABLE_MAIN: |
96 | net->ipv4.fib_main = tb; |
97 | break; |
98 | |
99 | case RT_TABLE_DEFAULT: |
100 | net->ipv4.fib_default = tb; |
101 | break; |
102 | |
103 | default: |
104 | break; |
105 | } |
106 | |
107 | h = id & (FIB_TABLE_HASHSZ - 1); |
108 | hlist_add_head_rcu(&tb->tb_hlist, &net->ipv4.fib_table_hash[h]); |
109 | return tb; |
110 | } |
111 | |
112 | struct fib_table *fib_get_table(struct net *net, u32 id) |
113 | { |
114 | struct fib_table *tb; |
115 | struct hlist_head *head; |
116 | unsigned int h; |
117 | |
118 | if (id == 0) |
119 | id = RT_TABLE_MAIN; |
120 | h = id & (FIB_TABLE_HASHSZ - 1); |
121 | |
122 | rcu_read_lock(); |
123 | head = &net->ipv4.fib_table_hash[h]; |
124 | hlist_for_each_entry_rcu(tb, head, tb_hlist) { |
125 | if (tb->tb_id == id) { |
126 | rcu_read_unlock(); |
127 | return tb; |
128 | } |
129 | } |
130 | rcu_read_unlock(); |
131 | return NULL; |
132 | } |
133 | #endif /* CONFIG_IP_MULTIPLE_TABLES */ |
134 | |
135 | static void fib_flush(struct net *net) |
136 | { |
137 | int flushed = 0; |
138 | struct fib_table *tb; |
139 | struct hlist_head *head; |
140 | unsigned int h; |
141 | |
142 | for (h = 0; h < FIB_TABLE_HASHSZ; h++) { |
143 | head = &net->ipv4.fib_table_hash[h]; |
144 | hlist_for_each_entry(tb, head, tb_hlist) |
145 | flushed += fib_table_flush(tb); |
146 | } |
147 | |
148 | if (flushed) |
149 | rt_cache_flush(net); |
150 | } |
151 | |
152 | /* |
153 | * Find address type as if only "dev" was present in the system. If |
154 | * on_dev is NULL then all interfaces are taken into consideration. |
155 | */ |
156 | static inline unsigned int __inet_dev_addr_type(struct net *net, |
157 | const struct net_device *dev, |
158 | __be32 addr) |
159 | { |
160 | struct flowi4 fl4 = { .daddr = addr }; |
161 | struct fib_result res; |
162 | unsigned int ret = RTN_BROADCAST; |
163 | struct fib_table *local_table; |
164 | |
165 | if (ipv4_is_zeronet(addr) || ipv4_is_lbcast(addr)) |
166 | return RTN_BROADCAST; |
167 | if (ipv4_is_multicast(addr)) |
168 | return RTN_MULTICAST; |
169 | |
170 | local_table = fib_get_table(net, RT_TABLE_LOCAL); |
171 | if (local_table) { |
172 | ret = RTN_UNICAST; |
173 | rcu_read_lock(); |
174 | if (!fib_table_lookup(local_table, &fl4, &res, FIB_LOOKUP_NOREF)) { |
175 | if (!dev || dev == res.fi->fib_dev) |
176 | ret = res.type; |
177 | } |
178 | rcu_read_unlock(); |
179 | } |
180 | return ret; |
181 | } |
182 | |
183 | unsigned int inet_addr_type(struct net *net, __be32 addr) |
184 | { |
185 | return __inet_dev_addr_type(net, NULL, addr); |
186 | } |
187 | EXPORT_SYMBOL(inet_addr_type); |
188 | |
189 | unsigned int inet_dev_addr_type(struct net *net, const struct net_device *dev, |
190 | __be32 addr) |
191 | { |
192 | return __inet_dev_addr_type(net, dev, addr); |
193 | } |
194 | EXPORT_SYMBOL(inet_dev_addr_type); |
195 | |
196 | __be32 fib_compute_spec_dst(struct sk_buff *skb) |
197 | { |
198 | struct net_device *dev = skb->dev; |
199 | struct in_device *in_dev; |
200 | struct fib_result res; |
201 | struct rtable *rt; |
202 | struct flowi4 fl4; |
203 | struct net *net; |
204 | int scope; |
205 | |
206 | rt = skb_rtable(skb); |
207 | if ((rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST | RTCF_LOCAL)) == |
208 | RTCF_LOCAL) |
209 | return ip_hdr(skb)->daddr; |
210 | |
211 | in_dev = __in_dev_get_rcu(dev); |
212 | BUG_ON(!in_dev); |
213 | |
214 | net = dev_net(dev); |
215 | |
216 | scope = RT_SCOPE_UNIVERSE; |
217 | if (!ipv4_is_zeronet(ip_hdr(skb)->saddr)) { |
218 | fl4.flowi4_oif = 0; |
219 | fl4.flowi4_iif = LOOPBACK_IFINDEX; |
220 | fl4.daddr = ip_hdr(skb)->saddr; |
221 | fl4.saddr = 0; |
222 | fl4.flowi4_tos = RT_TOS(ip_hdr(skb)->tos); |
223 | fl4.flowi4_scope = scope; |
224 | fl4.flowi4_mark = IN_DEV_SRC_VMARK(in_dev) ? skb->mark : 0; |
225 | if (!fib_lookup(net, &fl4, &res)) |
226 | return FIB_RES_PREFSRC(net, res); |
227 | } else { |
228 | scope = RT_SCOPE_LINK; |
229 | } |
230 | |
231 | return inet_select_addr(dev, ip_hdr(skb)->saddr, scope); |
232 | } |
233 | |
234 | /* Given (packet source, input interface) and optional (dst, oif, tos): |
235 | * - (main) check, that source is valid i.e. not broadcast or our local |
236 | * address. |
237 | * - figure out what "logical" interface this packet arrived |
238 | * and calculate "specific destination" address. |
239 | * - check, that packet arrived from expected physical interface. |
240 | * called with rcu_read_lock() |
241 | */ |
242 | static int __fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst, |
243 | u8 tos, int oif, struct net_device *dev, |
244 | int rpf, struct in_device *idev, u32 *itag) |
245 | { |
246 | int ret, no_addr, accept_local; |
247 | struct fib_result res; |
248 | struct flowi4 fl4; |
249 | struct net *net; |
250 | bool dev_match; |
251 | |
252 | fl4.flowi4_oif = 0; |
253 | fl4.flowi4_iif = oif; |
254 | fl4.daddr = src; |
255 | fl4.saddr = dst; |
256 | fl4.flowi4_tos = tos; |
257 | fl4.flowi4_scope = RT_SCOPE_UNIVERSE; |
258 | |
259 | no_addr = idev->ifa_list == NULL; |
260 | |
261 | accept_local = IN_DEV_ACCEPT_LOCAL(idev); |
262 | fl4.flowi4_mark = IN_DEV_SRC_VMARK(idev) ? skb->mark : 0; |
263 | |
264 | net = dev_net(dev); |
265 | if (fib_lookup(net, &fl4, &res)) |
266 | goto last_resort; |
267 | if (res.type != RTN_UNICAST) { |
268 | if (res.type != RTN_LOCAL || !accept_local) |
269 | goto e_inval; |
270 | } |
271 | fib_combine_itag(itag, &res); |
272 | dev_match = false; |
273 | |
274 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
275 | for (ret = 0; ret < res.fi->fib_nhs; ret++) { |
276 | struct fib_nh *nh = &res.fi->fib_nh[ret]; |
277 | |
278 | if (nh->nh_dev == dev) { |
279 | dev_match = true; |
280 | break; |
281 | } |
282 | } |
283 | #else |
284 | if (FIB_RES_DEV(res) == dev) |
285 | dev_match = true; |
286 | #endif |
287 | if (dev_match) { |
288 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; |
289 | return ret; |
290 | } |
291 | if (no_addr) |
292 | goto last_resort; |
293 | if (rpf == 1) |
294 | goto e_rpf; |
295 | fl4.flowi4_oif = dev->ifindex; |
296 | |
297 | ret = 0; |
298 | if (fib_lookup(net, &fl4, &res) == 0) { |
299 | if (res.type == RTN_UNICAST) |
300 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; |
301 | } |
302 | return ret; |
303 | |
304 | last_resort: |
305 | if (rpf) |
306 | goto e_rpf; |
307 | *itag = 0; |
308 | return 0; |
309 | |
310 | e_inval: |
311 | return -EINVAL; |
312 | e_rpf: |
313 | return -EXDEV; |
314 | } |
315 | |
316 | /* Ignore rp_filter for packets protected by IPsec. */ |
317 | int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst, |
318 | u8 tos, int oif, struct net_device *dev, |
319 | struct in_device *idev, u32 *itag) |
320 | { |
321 | int r = secpath_exists(skb) ? 0 : IN_DEV_RPFILTER(idev); |
322 | |
323 | if (!r && !fib_num_tclassid_users(dev_net(dev)) && |
324 | (dev->ifindex != oif || !IN_DEV_TX_REDIRECTS(idev))) { |
325 | *itag = 0; |
326 | return 0; |
327 | } |
328 | return __fib_validate_source(skb, src, dst, tos, oif, dev, r, idev, itag); |
329 | } |
330 | |
331 | static inline __be32 sk_extract_addr(struct sockaddr *addr) |
332 | { |
333 | return ((struct sockaddr_in *) addr)->sin_addr.s_addr; |
334 | } |
335 | |
336 | static int put_rtax(struct nlattr *mx, int len, int type, u32 value) |
337 | { |
338 | struct nlattr *nla; |
339 | |
340 | nla = (struct nlattr *) ((char *) mx + len); |
341 | nla->nla_type = type; |
342 | nla->nla_len = nla_attr_size(4); |
343 | *(u32 *) nla_data(nla) = value; |
344 | |
345 | return len + nla_total_size(4); |
346 | } |
347 | |
348 | static int rtentry_to_fib_config(struct net *net, int cmd, struct rtentry *rt, |
349 | struct fib_config *cfg) |
350 | { |
351 | __be32 addr; |
352 | int plen; |
353 | |
354 | memset(cfg, 0, sizeof(*cfg)); |
355 | cfg->fc_nlinfo.nl_net = net; |
356 | |
357 | if (rt->rt_dst.sa_family != AF_INET) |
358 | return -EAFNOSUPPORT; |
359 | |
360 | /* |
361 | * Check mask for validity: |
362 | * a) it must be contiguous. |
363 | * b) destination must have all host bits clear. |
364 | * c) if application forgot to set correct family (AF_INET), |
365 | * reject request unless it is absolutely clear i.e. |
366 | * both family and mask are zero. |
367 | */ |
368 | plen = 32; |
369 | addr = sk_extract_addr(&rt->rt_dst); |
370 | if (!(rt->rt_flags & RTF_HOST)) { |
371 | __be32 mask = sk_extract_addr(&rt->rt_genmask); |
372 | |
373 | if (rt->rt_genmask.sa_family != AF_INET) { |
374 | if (mask || rt->rt_genmask.sa_family) |
375 | return -EAFNOSUPPORT; |
376 | } |
377 | |
378 | if (bad_mask(mask, addr)) |
379 | return -EINVAL; |
380 | |
381 | plen = inet_mask_len(mask); |
382 | } |
383 | |
384 | cfg->fc_dst_len = plen; |
385 | cfg->fc_dst = addr; |
386 | |
387 | if (cmd != SIOCDELRT) { |
388 | cfg->fc_nlflags = NLM_F_CREATE; |
389 | cfg->fc_protocol = RTPROT_BOOT; |
390 | } |
391 | |
392 | if (rt->rt_metric) |
393 | cfg->fc_priority = rt->rt_metric - 1; |
394 | |
395 | if (rt->rt_flags & RTF_REJECT) { |
396 | cfg->fc_scope = RT_SCOPE_HOST; |
397 | cfg->fc_type = RTN_UNREACHABLE; |
398 | return 0; |
399 | } |
400 | |
401 | cfg->fc_scope = RT_SCOPE_NOWHERE; |
402 | cfg->fc_type = RTN_UNICAST; |
403 | |
404 | if (rt->rt_dev) { |
405 | char *colon; |
406 | struct net_device *dev; |
407 | char devname[IFNAMSIZ]; |
408 | |
409 | if (copy_from_user(devname, rt->rt_dev, IFNAMSIZ-1)) |
410 | return -EFAULT; |
411 | |
412 | devname[IFNAMSIZ-1] = 0; |
413 | colon = strchr(devname, ':'); |
414 | if (colon) |
415 | *colon = 0; |
416 | dev = __dev_get_by_name(net, devname); |
417 | if (!dev) |
418 | return -ENODEV; |
419 | cfg->fc_oif = dev->ifindex; |
420 | if (colon) { |
421 | struct in_ifaddr *ifa; |
422 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
423 | if (!in_dev) |
424 | return -ENODEV; |
425 | *colon = ':'; |
426 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) |
427 | if (strcmp(ifa->ifa_label, devname) == 0) |
428 | break; |
429 | if (ifa == NULL) |
430 | return -ENODEV; |
431 | cfg->fc_prefsrc = ifa->ifa_local; |
432 | } |
433 | } |
434 | |
435 | addr = sk_extract_addr(&rt->rt_gateway); |
436 | if (rt->rt_gateway.sa_family == AF_INET && addr) { |
437 | cfg->fc_gw = addr; |
438 | if (rt->rt_flags & RTF_GATEWAY && |
439 | inet_addr_type(net, addr) == RTN_UNICAST) |
440 | cfg->fc_scope = RT_SCOPE_UNIVERSE; |
441 | } |
442 | |
443 | if (cmd == SIOCDELRT) |
444 | return 0; |
445 | |
446 | if (rt->rt_flags & RTF_GATEWAY && !cfg->fc_gw) |
447 | return -EINVAL; |
448 | |
449 | if (cfg->fc_scope == RT_SCOPE_NOWHERE) |
450 | cfg->fc_scope = RT_SCOPE_LINK; |
451 | |
452 | if (rt->rt_flags & (RTF_MTU | RTF_WINDOW | RTF_IRTT)) { |
453 | struct nlattr *mx; |
454 | int len = 0; |
455 | |
456 | mx = kzalloc(3 * nla_total_size(4), GFP_KERNEL); |
457 | if (mx == NULL) |
458 | return -ENOMEM; |
459 | |
460 | if (rt->rt_flags & RTF_MTU) |
461 | len = put_rtax(mx, len, RTAX_ADVMSS, rt->rt_mtu - 40); |
462 | |
463 | if (rt->rt_flags & RTF_WINDOW) |
464 | len = put_rtax(mx, len, RTAX_WINDOW, rt->rt_window); |
465 | |
466 | if (rt->rt_flags & RTF_IRTT) |
467 | len = put_rtax(mx, len, RTAX_RTT, rt->rt_irtt << 3); |
468 | |
469 | cfg->fc_mx = mx; |
470 | cfg->fc_mx_len = len; |
471 | } |
472 | |
473 | return 0; |
474 | } |
475 | |
476 | /* |
477 | * Handle IP routing ioctl calls. |
478 | * These are used to manipulate the routing tables |
479 | */ |
480 | int ip_rt_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
481 | { |
482 | struct fib_config cfg; |
483 | struct rtentry rt; |
484 | int err; |
485 | |
486 | switch (cmd) { |
487 | case SIOCADDRT: /* Add a route */ |
488 | case SIOCDELRT: /* Delete a route */ |
489 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
490 | return -EPERM; |
491 | |
492 | if (copy_from_user(&rt, arg, sizeof(rt))) |
493 | return -EFAULT; |
494 | |
495 | rtnl_lock(); |
496 | err = rtentry_to_fib_config(net, cmd, &rt, &cfg); |
497 | if (err == 0) { |
498 | struct fib_table *tb; |
499 | |
500 | if (cmd == SIOCDELRT) { |
501 | tb = fib_get_table(net, cfg.fc_table); |
502 | if (tb) |
503 | err = fib_table_delete(tb, &cfg); |
504 | else |
505 | err = -ESRCH; |
506 | } else { |
507 | tb = fib_new_table(net, cfg.fc_table); |
508 | if (tb) |
509 | err = fib_table_insert(tb, &cfg); |
510 | else |
511 | err = -ENOBUFS; |
512 | } |
513 | |
514 | /* allocated by rtentry_to_fib_config() */ |
515 | kfree(cfg.fc_mx); |
516 | } |
517 | rtnl_unlock(); |
518 | return err; |
519 | } |
520 | return -EINVAL; |
521 | } |
522 | |
523 | const struct nla_policy rtm_ipv4_policy[RTA_MAX + 1] = { |
524 | [RTA_DST] = { .type = NLA_U32 }, |
525 | [RTA_SRC] = { .type = NLA_U32 }, |
526 | [RTA_IIF] = { .type = NLA_U32 }, |
527 | [RTA_OIF] = { .type = NLA_U32 }, |
528 | [RTA_GATEWAY] = { .type = NLA_U32 }, |
529 | [RTA_PRIORITY] = { .type = NLA_U32 }, |
530 | [RTA_PREFSRC] = { .type = NLA_U32 }, |
531 | [RTA_METRICS] = { .type = NLA_NESTED }, |
532 | [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, |
533 | [RTA_FLOW] = { .type = NLA_U32 }, |
534 | }; |
535 | |
536 | static int rtm_to_fib_config(struct net *net, struct sk_buff *skb, |
537 | struct nlmsghdr *nlh, struct fib_config *cfg) |
538 | { |
539 | struct nlattr *attr; |
540 | int err, remaining; |
541 | struct rtmsg *rtm; |
542 | |
543 | err = nlmsg_validate(nlh, sizeof(*rtm), RTA_MAX, rtm_ipv4_policy); |
544 | if (err < 0) |
545 | goto errout; |
546 | |
547 | memset(cfg, 0, sizeof(*cfg)); |
548 | |
549 | rtm = nlmsg_data(nlh); |
550 | cfg->fc_dst_len = rtm->rtm_dst_len; |
551 | cfg->fc_tos = rtm->rtm_tos; |
552 | cfg->fc_table = rtm->rtm_table; |
553 | cfg->fc_protocol = rtm->rtm_protocol; |
554 | cfg->fc_scope = rtm->rtm_scope; |
555 | cfg->fc_type = rtm->rtm_type; |
556 | cfg->fc_flags = rtm->rtm_flags; |
557 | cfg->fc_nlflags = nlh->nlmsg_flags; |
558 | |
559 | cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid; |
560 | cfg->fc_nlinfo.nlh = nlh; |
561 | cfg->fc_nlinfo.nl_net = net; |
562 | |
563 | if (cfg->fc_type > RTN_MAX) { |
564 | err = -EINVAL; |
565 | goto errout; |
566 | } |
567 | |
568 | nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), remaining) { |
569 | switch (nla_type(attr)) { |
570 | case RTA_DST: |
571 | cfg->fc_dst = nla_get_be32(attr); |
572 | break; |
573 | case RTA_OIF: |
574 | cfg->fc_oif = nla_get_u32(attr); |
575 | break; |
576 | case RTA_GATEWAY: |
577 | cfg->fc_gw = nla_get_be32(attr); |
578 | break; |
579 | case RTA_PRIORITY: |
580 | cfg->fc_priority = nla_get_u32(attr); |
581 | break; |
582 | case RTA_PREFSRC: |
583 | cfg->fc_prefsrc = nla_get_be32(attr); |
584 | break; |
585 | case RTA_METRICS: |
586 | cfg->fc_mx = nla_data(attr); |
587 | cfg->fc_mx_len = nla_len(attr); |
588 | break; |
589 | case RTA_MULTIPATH: |
590 | cfg->fc_mp = nla_data(attr); |
591 | cfg->fc_mp_len = nla_len(attr); |
592 | break; |
593 | case RTA_FLOW: |
594 | cfg->fc_flow = nla_get_u32(attr); |
595 | break; |
596 | case RTA_TABLE: |
597 | cfg->fc_table = nla_get_u32(attr); |
598 | break; |
599 | } |
600 | } |
601 | |
602 | return 0; |
603 | errout: |
604 | return err; |
605 | } |
606 | |
607 | static int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) |
608 | { |
609 | struct net *net = sock_net(skb->sk); |
610 | struct fib_config cfg; |
611 | struct fib_table *tb; |
612 | int err; |
613 | |
614 | err = rtm_to_fib_config(net, skb, nlh, &cfg); |
615 | if (err < 0) |
616 | goto errout; |
617 | |
618 | tb = fib_get_table(net, cfg.fc_table); |
619 | if (tb == NULL) { |
620 | err = -ESRCH; |
621 | goto errout; |
622 | } |
623 | |
624 | err = fib_table_delete(tb, &cfg); |
625 | errout: |
626 | return err; |
627 | } |
628 | |
629 | static int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) |
630 | { |
631 | struct net *net = sock_net(skb->sk); |
632 | struct fib_config cfg; |
633 | struct fib_table *tb; |
634 | int err; |
635 | |
636 | err = rtm_to_fib_config(net, skb, nlh, &cfg); |
637 | if (err < 0) |
638 | goto errout; |
639 | |
640 | tb = fib_new_table(net, cfg.fc_table); |
641 | if (tb == NULL) { |
642 | err = -ENOBUFS; |
643 | goto errout; |
644 | } |
645 | |
646 | err = fib_table_insert(tb, &cfg); |
647 | errout: |
648 | return err; |
649 | } |
650 | |
651 | static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb) |
652 | { |
653 | struct net *net = sock_net(skb->sk); |
654 | unsigned int h, s_h; |
655 | unsigned int e = 0, s_e; |
656 | struct fib_table *tb; |
657 | struct hlist_head *head; |
658 | int dumped = 0; |
659 | |
660 | if (nlmsg_len(cb->nlh) >= sizeof(struct rtmsg) && |
661 | ((struct rtmsg *) nlmsg_data(cb->nlh))->rtm_flags & RTM_F_CLONED) |
662 | return ip_rt_dump(skb, cb); |
663 | |
664 | s_h = cb->args[0]; |
665 | s_e = cb->args[1]; |
666 | |
667 | for (h = s_h; h < FIB_TABLE_HASHSZ; h++, s_e = 0) { |
668 | e = 0; |
669 | head = &net->ipv4.fib_table_hash[h]; |
670 | hlist_for_each_entry(tb, head, tb_hlist) { |
671 | if (e < s_e) |
672 | goto next; |
673 | if (dumped) |
674 | memset(&cb->args[2], 0, sizeof(cb->args) - |
675 | 2 * sizeof(cb->args[0])); |
676 | if (fib_table_dump(tb, skb, cb) < 0) |
677 | goto out; |
678 | dumped = 1; |
679 | next: |
680 | e++; |
681 | } |
682 | } |
683 | out: |
684 | cb->args[1] = e; |
685 | cb->args[0] = h; |
686 | |
687 | return skb->len; |
688 | } |
689 | |
690 | /* Prepare and feed intra-kernel routing request. |
691 | * Really, it should be netlink message, but :-( netlink |
692 | * can be not configured, so that we feed it directly |
693 | * to fib engine. It is legal, because all events occur |
694 | * only when netlink is already locked. |
695 | */ |
696 | static void fib_magic(int cmd, int type, __be32 dst, int dst_len, struct in_ifaddr *ifa) |
697 | { |
698 | struct net *net = dev_net(ifa->ifa_dev->dev); |
699 | struct fib_table *tb; |
700 | struct fib_config cfg = { |
701 | .fc_protocol = RTPROT_KERNEL, |
702 | .fc_type = type, |
703 | .fc_dst = dst, |
704 | .fc_dst_len = dst_len, |
705 | .fc_prefsrc = ifa->ifa_local, |
706 | .fc_oif = ifa->ifa_dev->dev->ifindex, |
707 | .fc_nlflags = NLM_F_CREATE | NLM_F_APPEND, |
708 | .fc_nlinfo = { |
709 | .nl_net = net, |
710 | }, |
711 | }; |
712 | |
713 | if (type == RTN_UNICAST) |
714 | tb = fib_new_table(net, RT_TABLE_MAIN); |
715 | else |
716 | tb = fib_new_table(net, RT_TABLE_LOCAL); |
717 | |
718 | if (tb == NULL) |
719 | return; |
720 | |
721 | cfg.fc_table = tb->tb_id; |
722 | |
723 | if (type != RTN_LOCAL) |
724 | cfg.fc_scope = RT_SCOPE_LINK; |
725 | else |
726 | cfg.fc_scope = RT_SCOPE_HOST; |
727 | |
728 | if (cmd == RTM_NEWROUTE) |
729 | fib_table_insert(tb, &cfg); |
730 | else |
731 | fib_table_delete(tb, &cfg); |
732 | } |
733 | |
734 | void fib_add_ifaddr(struct in_ifaddr *ifa) |
735 | { |
736 | struct in_device *in_dev = ifa->ifa_dev; |
737 | struct net_device *dev = in_dev->dev; |
738 | struct in_ifaddr *prim = ifa; |
739 | __be32 mask = ifa->ifa_mask; |
740 | __be32 addr = ifa->ifa_local; |
741 | __be32 prefix = ifa->ifa_address & mask; |
742 | |
743 | if (ifa->ifa_flags & IFA_F_SECONDARY) { |
744 | prim = inet_ifa_byprefix(in_dev, prefix, mask); |
745 | if (prim == NULL) { |
746 | pr_warn("%s: bug: prim == NULL\n", __func__); |
747 | return; |
748 | } |
749 | } |
750 | |
751 | fib_magic(RTM_NEWROUTE, RTN_LOCAL, addr, 32, prim); |
752 | |
753 | if (!(dev->flags & IFF_UP)) |
754 | return; |
755 | |
756 | /* Add broadcast address, if it is explicitly assigned. */ |
757 | if (ifa->ifa_broadcast && ifa->ifa_broadcast != htonl(0xFFFFFFFF)) |
758 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); |
759 | |
760 | if (!ipv4_is_zeronet(prefix) && !(ifa->ifa_flags & IFA_F_SECONDARY) && |
761 | (prefix != addr || ifa->ifa_prefixlen < 32)) { |
762 | fib_magic(RTM_NEWROUTE, |
763 | dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST, |
764 | prefix, ifa->ifa_prefixlen, prim); |
765 | |
766 | /* Add network specific broadcasts, when it takes a sense */ |
767 | if (ifa->ifa_prefixlen < 31) { |
768 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix, 32, prim); |
769 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix | ~mask, |
770 | 32, prim); |
771 | } |
772 | } |
773 | } |
774 | |
775 | /* Delete primary or secondary address. |
776 | * Optionally, on secondary address promotion consider the addresses |
777 | * from subnet iprim as deleted, even if they are in device list. |
778 | * In this case the secondary ifa can be in device list. |
779 | */ |
780 | void fib_del_ifaddr(struct in_ifaddr *ifa, struct in_ifaddr *iprim) |
781 | { |
782 | struct in_device *in_dev = ifa->ifa_dev; |
783 | struct net_device *dev = in_dev->dev; |
784 | struct in_ifaddr *ifa1; |
785 | struct in_ifaddr *prim = ifa, *prim1 = NULL; |
786 | __be32 brd = ifa->ifa_address | ~ifa->ifa_mask; |
787 | __be32 any = ifa->ifa_address & ifa->ifa_mask; |
788 | #define LOCAL_OK 1 |
789 | #define BRD_OK 2 |
790 | #define BRD0_OK 4 |
791 | #define BRD1_OK 8 |
792 | unsigned int ok = 0; |
793 | int subnet = 0; /* Primary network */ |
794 | int gone = 1; /* Address is missing */ |
795 | int same_prefsrc = 0; /* Another primary with same IP */ |
796 | |
797 | if (ifa->ifa_flags & IFA_F_SECONDARY) { |
798 | prim = inet_ifa_byprefix(in_dev, any, ifa->ifa_mask); |
799 | if (prim == NULL) { |
800 | pr_warn("%s: bug: prim == NULL\n", __func__); |
801 | return; |
802 | } |
803 | if (iprim && iprim != prim) { |
804 | pr_warn("%s: bug: iprim != prim\n", __func__); |
805 | return; |
806 | } |
807 | } else if (!ipv4_is_zeronet(any) && |
808 | (any != ifa->ifa_local || ifa->ifa_prefixlen < 32)) { |
809 | fib_magic(RTM_DELROUTE, |
810 | dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST, |
811 | any, ifa->ifa_prefixlen, prim); |
812 | subnet = 1; |
813 | } |
814 | |
815 | /* Deletion is more complicated than add. |
816 | * We should take care of not to delete too much :-) |
817 | * |
818 | * Scan address list to be sure that addresses are really gone. |
819 | */ |
820 | |
821 | for (ifa1 = in_dev->ifa_list; ifa1; ifa1 = ifa1->ifa_next) { |
822 | if (ifa1 == ifa) { |
823 | /* promotion, keep the IP */ |
824 | gone = 0; |
825 | continue; |
826 | } |
827 | /* Ignore IFAs from our subnet */ |
828 | if (iprim && ifa1->ifa_mask == iprim->ifa_mask && |
829 | inet_ifa_match(ifa1->ifa_address, iprim)) |
830 | continue; |
831 | |
832 | /* Ignore ifa1 if it uses different primary IP (prefsrc) */ |
833 | if (ifa1->ifa_flags & IFA_F_SECONDARY) { |
834 | /* Another address from our subnet? */ |
835 | if (ifa1->ifa_mask == prim->ifa_mask && |
836 | inet_ifa_match(ifa1->ifa_address, prim)) |
837 | prim1 = prim; |
838 | else { |
839 | /* We reached the secondaries, so |
840 | * same_prefsrc should be determined. |
841 | */ |
842 | if (!same_prefsrc) |
843 | continue; |
844 | /* Search new prim1 if ifa1 is not |
845 | * using the current prim1 |
846 | */ |
847 | if (!prim1 || |
848 | ifa1->ifa_mask != prim1->ifa_mask || |
849 | !inet_ifa_match(ifa1->ifa_address, prim1)) |
850 | prim1 = inet_ifa_byprefix(in_dev, |
851 | ifa1->ifa_address, |
852 | ifa1->ifa_mask); |
853 | if (!prim1) |
854 | continue; |
855 | if (prim1->ifa_local != prim->ifa_local) |
856 | continue; |
857 | } |
858 | } else { |
859 | if (prim->ifa_local != ifa1->ifa_local) |
860 | continue; |
861 | prim1 = ifa1; |
862 | if (prim != prim1) |
863 | same_prefsrc = 1; |
864 | } |
865 | if (ifa->ifa_local == ifa1->ifa_local) |
866 | ok |= LOCAL_OK; |
867 | if (ifa->ifa_broadcast == ifa1->ifa_broadcast) |
868 | ok |= BRD_OK; |
869 | if (brd == ifa1->ifa_broadcast) |
870 | ok |= BRD1_OK; |
871 | if (any == ifa1->ifa_broadcast) |
872 | ok |= BRD0_OK; |
873 | /* primary has network specific broadcasts */ |
874 | if (prim1 == ifa1 && ifa1->ifa_prefixlen < 31) { |
875 | __be32 brd1 = ifa1->ifa_address | ~ifa1->ifa_mask; |
876 | __be32 any1 = ifa1->ifa_address & ifa1->ifa_mask; |
877 | |
878 | if (!ipv4_is_zeronet(any1)) { |
879 | if (ifa->ifa_broadcast == brd1 || |
880 | ifa->ifa_broadcast == any1) |
881 | ok |= BRD_OK; |
882 | if (brd == brd1 || brd == any1) |
883 | ok |= BRD1_OK; |
884 | if (any == brd1 || any == any1) |
885 | ok |= BRD0_OK; |
886 | } |
887 | } |
888 | } |
889 | |
890 | if (!(ok & BRD_OK)) |
891 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); |
892 | if (subnet && ifa->ifa_prefixlen < 31) { |
893 | if (!(ok & BRD1_OK)) |
894 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, brd, 32, prim); |
895 | if (!(ok & BRD0_OK)) |
896 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, any, 32, prim); |
897 | } |
898 | if (!(ok & LOCAL_OK)) { |
899 | fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 32, prim); |
900 | |
901 | /* Check, that this local address finally disappeared. */ |
902 | if (gone && |
903 | inet_addr_type(dev_net(dev), ifa->ifa_local) != RTN_LOCAL) { |
904 | /* And the last, but not the least thing. |
905 | * We must flush stray FIB entries. |
906 | * |
907 | * First of all, we scan fib_info list searching |
908 | * for stray nexthop entries, then ignite fib_flush. |
909 | */ |
910 | if (fib_sync_down_addr(dev_net(dev), ifa->ifa_local)) |
911 | fib_flush(dev_net(dev)); |
912 | } |
913 | } |
914 | #undef LOCAL_OK |
915 | #undef BRD_OK |
916 | #undef BRD0_OK |
917 | #undef BRD1_OK |
918 | } |
919 | |
920 | static void nl_fib_lookup(struct fib_result_nl *frn, struct fib_table *tb) |
921 | { |
922 | |
923 | struct fib_result res; |
924 | struct flowi4 fl4 = { |
925 | .flowi4_mark = frn->fl_mark, |
926 | .daddr = frn->fl_addr, |
927 | .flowi4_tos = frn->fl_tos, |
928 | .flowi4_scope = frn->fl_scope, |
929 | }; |
930 | |
931 | frn->err = -ENOENT; |
932 | if (tb) { |
933 | local_bh_disable(); |
934 | |
935 | frn->tb_id = tb->tb_id; |
936 | rcu_read_lock(); |
937 | frn->err = fib_table_lookup(tb, &fl4, &res, FIB_LOOKUP_NOREF); |
938 | |
939 | if (!frn->err) { |
940 | frn->prefixlen = res.prefixlen; |
941 | frn->nh_sel = res.nh_sel; |
942 | frn->type = res.type; |
943 | frn->scope = res.scope; |
944 | } |
945 | rcu_read_unlock(); |
946 | local_bh_enable(); |
947 | } |
948 | } |
949 | |
950 | static void nl_fib_input(struct sk_buff *skb) |
951 | { |
952 | struct net *net; |
953 | struct fib_result_nl *frn; |
954 | struct nlmsghdr *nlh; |
955 | struct fib_table *tb; |
956 | u32 portid; |
957 | |
958 | net = sock_net(skb->sk); |
959 | nlh = nlmsg_hdr(skb); |
960 | if (skb->len < NLMSG_SPACE(0) || skb->len < nlh->nlmsg_len || |
961 | nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*frn))) |
962 | return; |
963 | |
964 | skb = skb_clone(skb, GFP_KERNEL); |
965 | if (skb == NULL) |
966 | return; |
967 | nlh = nlmsg_hdr(skb); |
968 | |
969 | frn = (struct fib_result_nl *) NLMSG_DATA(nlh); |
970 | tb = fib_get_table(net, frn->tb_id_in); |
971 | |
972 | nl_fib_lookup(frn, tb); |
973 | |
974 | portid = NETLINK_CB(skb).portid; /* netlink portid */ |
975 | NETLINK_CB(skb).portid = 0; /* from kernel */ |
976 | NETLINK_CB(skb).dst_group = 0; /* unicast */ |
977 | netlink_unicast(net->ipv4.fibnl, skb, portid, MSG_DONTWAIT); |
978 | } |
979 | |
980 | static int __net_init nl_fib_lookup_init(struct net *net) |
981 | { |
982 | struct sock *sk; |
983 | struct netlink_kernel_cfg cfg = { |
984 | .input = nl_fib_input, |
985 | }; |
986 | |
987 | sk = netlink_kernel_create(net, NETLINK_FIB_LOOKUP, &cfg); |
988 | if (sk == NULL) |
989 | return -EAFNOSUPPORT; |
990 | net->ipv4.fibnl = sk; |
991 | return 0; |
992 | } |
993 | |
994 | static void nl_fib_lookup_exit(struct net *net) |
995 | { |
996 | netlink_kernel_release(net->ipv4.fibnl); |
997 | net->ipv4.fibnl = NULL; |
998 | } |
999 | |
1000 | static void fib_disable_ip(struct net_device *dev, int force) |
1001 | { |
1002 | if (fib_sync_down_dev(dev, force)) |
1003 | fib_flush(dev_net(dev)); |
1004 | rt_cache_flush(dev_net(dev)); |
1005 | arp_ifdown(dev); |
1006 | } |
1007 | |
1008 | static int fib_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr) |
1009 | { |
1010 | struct in_ifaddr *ifa = (struct in_ifaddr *)ptr; |
1011 | struct net_device *dev = ifa->ifa_dev->dev; |
1012 | struct net *net = dev_net(dev); |
1013 | |
1014 | switch (event) { |
1015 | case NETDEV_UP: |
1016 | fib_add_ifaddr(ifa); |
1017 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
1018 | fib_sync_up(dev); |
1019 | #endif |
1020 | atomic_inc(&net->ipv4.dev_addr_genid); |
1021 | rt_cache_flush(dev_net(dev)); |
1022 | break; |
1023 | case NETDEV_DOWN: |
1024 | fib_del_ifaddr(ifa, NULL); |
1025 | atomic_inc(&net->ipv4.dev_addr_genid); |
1026 | if (ifa->ifa_dev->ifa_list == NULL) { |
1027 | /* Last address was deleted from this interface. |
1028 | * Disable IP. |
1029 | */ |
1030 | fib_disable_ip(dev, 1); |
1031 | } else { |
1032 | rt_cache_flush(dev_net(dev)); |
1033 | } |
1034 | break; |
1035 | } |
1036 | return NOTIFY_DONE; |
1037 | } |
1038 | |
1039 | static int fib_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) |
1040 | { |
1041 | struct net_device *dev = ptr; |
1042 | struct in_device *in_dev; |
1043 | struct net *net = dev_net(dev); |
1044 | |
1045 | if (event == NETDEV_UNREGISTER) { |
1046 | fib_disable_ip(dev, 2); |
1047 | rt_flush_dev(dev); |
1048 | return NOTIFY_DONE; |
1049 | } |
1050 | |
1051 | in_dev = __in_dev_get_rtnl(dev); |
1052 | |
1053 | switch (event) { |
1054 | case NETDEV_UP: |
1055 | for_ifa(in_dev) { |
1056 | fib_add_ifaddr(ifa); |
1057 | } endfor_ifa(in_dev); |
1058 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
1059 | fib_sync_up(dev); |
1060 | #endif |
1061 | atomic_inc(&net->ipv4.dev_addr_genid); |
1062 | rt_cache_flush(net); |
1063 | break; |
1064 | case NETDEV_DOWN: |
1065 | fib_disable_ip(dev, 0); |
1066 | break; |
1067 | case NETDEV_CHANGEMTU: |
1068 | case NETDEV_CHANGE: |
1069 | rt_cache_flush(net); |
1070 | break; |
1071 | } |
1072 | return NOTIFY_DONE; |
1073 | } |
1074 | |
1075 | static struct notifier_block fib_inetaddr_notifier = { |
1076 | .notifier_call = fib_inetaddr_event, |
1077 | }; |
1078 | |
1079 | static struct notifier_block fib_netdev_notifier = { |
1080 | .notifier_call = fib_netdev_event, |
1081 | }; |
1082 | |
1083 | static int __net_init ip_fib_net_init(struct net *net) |
1084 | { |
1085 | int err; |
1086 | size_t size = sizeof(struct hlist_head) * FIB_TABLE_HASHSZ; |
1087 | |
1088 | /* Avoid false sharing : Use at least a full cache line */ |
1089 | size = max_t(size_t, size, L1_CACHE_BYTES); |
1090 | |
1091 | net->ipv4.fib_table_hash = kzalloc(size, GFP_KERNEL); |
1092 | if (net->ipv4.fib_table_hash == NULL) |
1093 | return -ENOMEM; |
1094 | |
1095 | err = fib4_rules_init(net); |
1096 | if (err < 0) |
1097 | goto fail; |
1098 | return 0; |
1099 | |
1100 | fail: |
1101 | kfree(net->ipv4.fib_table_hash); |
1102 | return err; |
1103 | } |
1104 | |
1105 | static void ip_fib_net_exit(struct net *net) |
1106 | { |
1107 | unsigned int i; |
1108 | |
1109 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
1110 | fib4_rules_exit(net); |
1111 | #endif |
1112 | |
1113 | rtnl_lock(); |
1114 | for (i = 0; i < FIB_TABLE_HASHSZ; i++) { |
1115 | struct fib_table *tb; |
1116 | struct hlist_head *head; |
1117 | struct hlist_node *tmp; |
1118 | |
1119 | head = &net->ipv4.fib_table_hash[i]; |
1120 | hlist_for_each_entry_safe(tb, tmp, head, tb_hlist) { |
1121 | hlist_del(&tb->tb_hlist); |
1122 | fib_table_flush(tb); |
1123 | fib_free_table(tb); |
1124 | } |
1125 | } |
1126 | rtnl_unlock(); |
1127 | kfree(net->ipv4.fib_table_hash); |
1128 | } |
1129 | |
1130 | static int __net_init fib_net_init(struct net *net) |
1131 | { |
1132 | int error; |
1133 | |
1134 | #ifdef CONFIG_IP_ROUTE_CLASSID |
1135 | net->ipv4.fib_num_tclassid_users = 0; |
1136 | #endif |
1137 | error = ip_fib_net_init(net); |
1138 | if (error < 0) |
1139 | goto out; |
1140 | error = nl_fib_lookup_init(net); |
1141 | if (error < 0) |
1142 | goto out_nlfl; |
1143 | error = fib_proc_init(net); |
1144 | if (error < 0) |
1145 | goto out_proc; |
1146 | out: |
1147 | return error; |
1148 | |
1149 | out_proc: |
1150 | nl_fib_lookup_exit(net); |
1151 | out_nlfl: |
1152 | ip_fib_net_exit(net); |
1153 | goto out; |
1154 | } |
1155 | |
1156 | static void __net_exit fib_net_exit(struct net *net) |
1157 | { |
1158 | fib_proc_exit(net); |
1159 | nl_fib_lookup_exit(net); |
1160 | ip_fib_net_exit(net); |
1161 | } |
1162 | |
1163 | static struct pernet_operations fib_net_ops = { |
1164 | .init = fib_net_init, |
1165 | .exit = fib_net_exit, |
1166 | }; |
1167 | |
1168 | void __init ip_fib_init(void) |
1169 | { |
1170 | rtnl_register(PF_INET, RTM_NEWROUTE, inet_rtm_newroute, NULL, NULL); |
1171 | rtnl_register(PF_INET, RTM_DELROUTE, inet_rtm_delroute, NULL, NULL); |
1172 | rtnl_register(PF_INET, RTM_GETROUTE, NULL, inet_dump_fib, NULL); |
1173 | |
1174 | register_pernet_subsys(&fib_net_ops); |
1175 | register_netdevice_notifier(&fib_netdev_notifier); |
1176 | register_inetaddr_notifier(&fib_inetaddr_notifier); |
1177 | |
1178 | fib_trie_init(); |
1179 | } |
1180 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
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jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9