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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
3 | * operating system. INET is implemented using the BSD Socket | |
4 | * interface as the means of communication with the user level. | |
5 | * | |
6 | * IPv4 Forwarding Information Base: FIB frontend. | |
7 | * | |
1da177e4 LT |
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 | ||
1da177e4 LT |
16 | #include <linux/module.h> |
17 | #include <asm/uaccess.h> | |
1da177e4 | 18 | #include <linux/bitops.h> |
4fc268d2 | 19 | #include <linux/capability.h> |
1da177e4 LT |
20 | #include <linux/types.h> |
21 | #include <linux/kernel.h> | |
1da177e4 LT |
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> | |
14c85021 | 29 | #include <linux/inetdevice.h> |
1da177e4 | 30 | #include <linux/netdevice.h> |
1823730f | 31 | #include <linux/if_addr.h> |
1da177e4 LT |
32 | #include <linux/if_arp.h> |
33 | #include <linux/skbuff.h> | |
7a9bc9b8 | 34 | #include <linux/cache.h> |
1da177e4 | 35 | #include <linux/init.h> |
1af5a8c4 | 36 | #include <linux/list.h> |
5a0e3ad6 | 37 | #include <linux/slab.h> |
1da177e4 LT |
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> | |
1da177e4 LT |
44 | #include <net/arp.h> |
45 | #include <net/ip_fib.h> | |
63f3444f | 46 | #include <net/rtnetlink.h> |
990078af | 47 | #include <net/xfrm.h> |
1da177e4 | 48 | |
1da177e4 LT |
49 | #ifndef CONFIG_IP_MULTIPLE_TABLES |
50 | ||
7b1a74fd | 51 | static int __net_init fib4_rules_init(struct net *net) |
c3e9a353 | 52 | { |
93456b6d DL |
53 | struct fib_table *local_table, *main_table; |
54 | ||
5348ba85 | 55 | local_table = fib_trie_table(RT_TABLE_LOCAL); |
93456b6d | 56 | if (local_table == NULL) |
dbb50165 DL |
57 | return -ENOMEM; |
58 | ||
5348ba85 | 59 | main_table = fib_trie_table(RT_TABLE_MAIN); |
93456b6d | 60 | if (main_table == NULL) |
dbb50165 DL |
61 | goto fail; |
62 | ||
93456b6d | 63 | hlist_add_head_rcu(&local_table->tb_hlist, |
e4aef8ae | 64 | &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX]); |
93456b6d | 65 | hlist_add_head_rcu(&main_table->tb_hlist, |
e4aef8ae | 66 | &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX]); |
dbb50165 DL |
67 | return 0; |
68 | ||
69 | fail: | |
93456b6d | 70 | kfree(local_table); |
dbb50165 | 71 | return -ENOMEM; |
c3e9a353 | 72 | } |
1af5a8c4 | 73 | #else |
1da177e4 | 74 | |
8ad4942c | 75 | struct fib_table *fib_new_table(struct net *net, u32 id) |
1da177e4 LT |
76 | { |
77 | struct fib_table *tb; | |
1af5a8c4 | 78 | unsigned int h; |
1da177e4 | 79 | |
1af5a8c4 PM |
80 | if (id == 0) |
81 | id = RT_TABLE_MAIN; | |
8ad4942c | 82 | tb = fib_get_table(net, id); |
1af5a8c4 PM |
83 | if (tb) |
84 | return tb; | |
7f9b8052 | 85 | |
5348ba85 | 86 | tb = fib_trie_table(id); |
1da177e4 LT |
87 | if (!tb) |
88 | return NULL; | |
1af5a8c4 | 89 | h = id & (FIB_TABLE_HASHSZ - 1); |
e4aef8ae | 90 | hlist_add_head_rcu(&tb->tb_hlist, &net->ipv4.fib_table_hash[h]); |
1da177e4 LT |
91 | return tb; |
92 | } | |
93 | ||
8ad4942c | 94 | struct fib_table *fib_get_table(struct net *net, u32 id) |
1af5a8c4 PM |
95 | { |
96 | struct fib_table *tb; | |
97 | struct hlist_node *node; | |
e4aef8ae | 98 | struct hlist_head *head; |
1af5a8c4 | 99 | unsigned int h; |
1da177e4 | 100 | |
1af5a8c4 PM |
101 | if (id == 0) |
102 | id = RT_TABLE_MAIN; | |
103 | h = id & (FIB_TABLE_HASHSZ - 1); | |
e4aef8ae | 104 | |
1af5a8c4 | 105 | rcu_read_lock(); |
e4aef8ae DL |
106 | head = &net->ipv4.fib_table_hash[h]; |
107 | hlist_for_each_entry_rcu(tb, node, head, tb_hlist) { | |
1af5a8c4 PM |
108 | if (tb->tb_id == id) { |
109 | rcu_read_unlock(); | |
110 | return tb; | |
111 | } | |
112 | } | |
113 | rcu_read_unlock(); | |
114 | return NULL; | |
115 | } | |
1da177e4 LT |
116 | #endif /* CONFIG_IP_MULTIPLE_TABLES */ |
117 | ||
e4aef8ae | 118 | static void fib_flush(struct net *net) |
1da177e4 LT |
119 | { |
120 | int flushed = 0; | |
1da177e4 | 121 | struct fib_table *tb; |
1af5a8c4 | 122 | struct hlist_node *node; |
e4aef8ae | 123 | struct hlist_head *head; |
1af5a8c4 | 124 | unsigned int h; |
1da177e4 | 125 | |
1af5a8c4 | 126 | for (h = 0; h < FIB_TABLE_HASHSZ; h++) { |
e4aef8ae DL |
127 | head = &net->ipv4.fib_table_hash[h]; |
128 | hlist_for_each_entry(tb, node, head, tb_hlist) | |
16c6cf8b | 129 | flushed += fib_table_flush(tb); |
1da177e4 | 130 | } |
1da177e4 LT |
131 | |
132 | if (flushed) | |
76e6ebfb | 133 | rt_cache_flush(net, -1); |
1da177e4 LT |
134 | } |
135 | ||
05538116 LAT |
136 | /* |
137 | * Find address type as if only "dev" was present in the system. If | |
138 | * on_dev is NULL then all interfaces are taken into consideration. | |
139 | */ | |
95c96174 ED |
140 | static inline unsigned int __inet_dev_addr_type(struct net *net, |
141 | const struct net_device *dev, | |
142 | __be32 addr) | |
1da177e4 | 143 | { |
9ade2286 | 144 | struct flowi4 fl4 = { .daddr = addr }; |
1da177e4 | 145 | struct fib_result res; |
95c96174 | 146 | unsigned int ret = RTN_BROADCAST; |
03cf786c | 147 | struct fib_table *local_table; |
1da177e4 | 148 | |
1e637c74 | 149 | if (ipv4_is_zeronet(addr) || ipv4_is_lbcast(addr)) |
1da177e4 | 150 | return RTN_BROADCAST; |
f97c1e0c | 151 | if (ipv4_is_multicast(addr)) |
1da177e4 LT |
152 | return RTN_MULTICAST; |
153 | ||
154 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
155 | res.r = NULL; | |
156 | #endif | |
e905a9ed | 157 | |
6b175b26 | 158 | local_table = fib_get_table(net, RT_TABLE_LOCAL); |
03cf786c | 159 | if (local_table) { |
1da177e4 | 160 | ret = RTN_UNICAST; |
ebc0ffae | 161 | rcu_read_lock(); |
9ade2286 | 162 | if (!fib_table_lookup(local_table, &fl4, &res, FIB_LOOKUP_NOREF)) { |
05538116 LAT |
163 | if (!dev || dev == res.fi->fib_dev) |
164 | ret = res.type; | |
1da177e4 | 165 | } |
ebc0ffae | 166 | rcu_read_unlock(); |
1da177e4 LT |
167 | } |
168 | return ret; | |
169 | } | |
170 | ||
6b175b26 | 171 | unsigned int inet_addr_type(struct net *net, __be32 addr) |
05538116 | 172 | { |
6b175b26 | 173 | return __inet_dev_addr_type(net, NULL, addr); |
05538116 | 174 | } |
4bc2f18b | 175 | EXPORT_SYMBOL(inet_addr_type); |
05538116 | 176 | |
6b175b26 EB |
177 | unsigned int inet_dev_addr_type(struct net *net, const struct net_device *dev, |
178 | __be32 addr) | |
05538116 | 179 | { |
6a31d2a9 | 180 | return __inet_dev_addr_type(net, dev, addr); |
05538116 | 181 | } |
4bc2f18b | 182 | EXPORT_SYMBOL(inet_dev_addr_type); |
05538116 | 183 | |
35ebf65e DM |
184 | __be32 fib_compute_spec_dst(struct sk_buff *skb) |
185 | { | |
186 | struct net_device *dev = skb->dev; | |
187 | struct in_device *in_dev; | |
188 | struct fib_result res; | |
a207a4b2 | 189 | struct rtable *rt; |
35ebf65e DM |
190 | struct flowi4 fl4; |
191 | struct net *net; | |
a207a4b2 | 192 | int scope; |
35ebf65e | 193 | |
a207a4b2 DM |
194 | rt = skb_rtable(skb); |
195 | if (!(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) | |
35ebf65e DM |
196 | return ip_hdr(skb)->daddr; |
197 | ||
198 | in_dev = __in_dev_get_rcu(dev); | |
199 | BUG_ON(!in_dev); | |
35ebf65e DM |
200 | |
201 | net = dev_net(dev); | |
a207a4b2 DM |
202 | |
203 | scope = RT_SCOPE_UNIVERSE; | |
204 | if (!ipv4_is_zeronet(ip_hdr(skb)->saddr)) { | |
205 | fl4.flowi4_oif = 0; | |
206 | fl4.flowi4_iif = net->loopback_dev->ifindex; | |
207 | fl4.daddr = ip_hdr(skb)->saddr; | |
208 | fl4.saddr = 0; | |
209 | fl4.flowi4_tos = RT_TOS(ip_hdr(skb)->tos); | |
210 | fl4.flowi4_scope = scope; | |
211 | fl4.flowi4_mark = IN_DEV_SRC_VMARK(in_dev) ? skb->mark : 0; | |
212 | if (!fib_lookup(net, &fl4, &res)) | |
213 | return FIB_RES_PREFSRC(net, res); | |
214 | } else { | |
215 | scope = RT_SCOPE_LINK; | |
216 | } | |
217 | ||
218 | return inet_select_addr(dev, ip_hdr(skb)->saddr, scope); | |
35ebf65e DM |
219 | } |
220 | ||
7a9bc9b8 DM |
221 | #ifdef CONFIG_IP_ROUTE_CLASSID |
222 | int fib_num_tclassid_users __read_mostly; | |
223 | #endif | |
224 | ||
1da177e4 | 225 | /* Given (packet source, input interface) and optional (dst, oif, tos): |
6a31d2a9 ED |
226 | * - (main) check, that source is valid i.e. not broadcast or our local |
227 | * address. | |
228 | * - figure out what "logical" interface this packet arrived | |
229 | * and calculate "specific destination" address. | |
230 | * - check, that packet arrived from expected physical interface. | |
ebc0ffae | 231 | * called with rcu_read_lock() |
1da177e4 | 232 | */ |
7a9bc9b8 DM |
233 | static int __fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst, |
234 | u8 tos, int oif, struct net_device *dev, | |
235 | int rpf, struct in_device *idev, u32 *itag) | |
1da177e4 | 236 | { |
7a9bc9b8 | 237 | int ret, no_addr, accept_local; |
1da177e4 | 238 | struct fib_result res; |
9e56e380 | 239 | struct flowi4 fl4; |
5b707aaa | 240 | struct net *net; |
9e56e380 | 241 | bool dev_match; |
1da177e4 | 242 | |
9ade2286 DM |
243 | fl4.flowi4_oif = 0; |
244 | fl4.flowi4_iif = oif; | |
9ade2286 DM |
245 | fl4.daddr = src; |
246 | fl4.saddr = dst; | |
247 | fl4.flowi4_tos = tos; | |
248 | fl4.flowi4_scope = RT_SCOPE_UNIVERSE; | |
cc7e17ea | 249 | |
7a9bc9b8 | 250 | no_addr = accept_local = 0; |
9e56e380 | 251 | no_addr = idev->ifa_list == NULL; |
990078af | 252 | |
9e56e380 DM |
253 | accept_local = IN_DEV_ACCEPT_LOCAL(idev); |
254 | fl4.flowi4_mark = IN_DEV_SRC_VMARK(idev) ? skb->mark : 0; | |
1da177e4 | 255 | |
c346dca1 | 256 | net = dev_net(dev); |
9ade2286 | 257 | if (fib_lookup(net, &fl4, &res)) |
1da177e4 | 258 | goto last_resort; |
8153a10c PM |
259 | if (res.type != RTN_UNICAST) { |
260 | if (res.type != RTN_LOCAL || !accept_local) | |
ebc0ffae | 261 | goto e_inval; |
8153a10c | 262 | } |
1da177e4 | 263 | fib_combine_itag(itag, &res); |
6f86b325 DM |
264 | dev_match = false; |
265 | ||
1da177e4 | 266 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
6f86b325 DM |
267 | for (ret = 0; ret < res.fi->fib_nhs; ret++) { |
268 | struct fib_nh *nh = &res.fi->fib_nh[ret]; | |
269 | ||
270 | if (nh->nh_dev == dev) { | |
271 | dev_match = true; | |
272 | break; | |
273 | } | |
274 | } | |
1da177e4 LT |
275 | #else |
276 | if (FIB_RES_DEV(res) == dev) | |
6f86b325 | 277 | dev_match = true; |
1da177e4 | 278 | #endif |
6f86b325 | 279 | if (dev_match) { |
1da177e4 | 280 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; |
1da177e4 LT |
281 | return ret; |
282 | } | |
1da177e4 LT |
283 | if (no_addr) |
284 | goto last_resort; | |
c1cf8422 | 285 | if (rpf == 1) |
b5f7e755 | 286 | goto e_rpf; |
9ade2286 | 287 | fl4.flowi4_oif = dev->ifindex; |
1da177e4 LT |
288 | |
289 | ret = 0; | |
9ade2286 | 290 | if (fib_lookup(net, &fl4, &res) == 0) { |
41347dcd | 291 | if (res.type == RTN_UNICAST) |
1da177e4 | 292 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; |
1da177e4 LT |
293 | } |
294 | return ret; | |
295 | ||
296 | last_resort: | |
297 | if (rpf) | |
b5f7e755 | 298 | goto e_rpf; |
1da177e4 LT |
299 | *itag = 0; |
300 | return 0; | |
301 | ||
1da177e4 LT |
302 | e_inval: |
303 | return -EINVAL; | |
b5f7e755 ED |
304 | e_rpf: |
305 | return -EXDEV; | |
1da177e4 LT |
306 | } |
307 | ||
7a9bc9b8 DM |
308 | /* Ignore rp_filter for packets protected by IPsec. */ |
309 | int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst, | |
310 | u8 tos, int oif, struct net_device *dev, | |
311 | struct in_device *idev, u32 *itag) | |
312 | { | |
313 | int r = secpath_exists(skb) ? 0 : IN_DEV_RPFILTER(idev); | |
314 | ||
315 | if (!r && !fib_num_tclassid_users) { | |
316 | *itag = 0; | |
317 | return 0; | |
318 | } | |
319 | return __fib_validate_source(skb, src, dst, tos, oif, dev, r, idev, itag); | |
320 | } | |
321 | ||
81f7bf6c | 322 | static inline __be32 sk_extract_addr(struct sockaddr *addr) |
4e902c57 TG |
323 | { |
324 | return ((struct sockaddr_in *) addr)->sin_addr.s_addr; | |
325 | } | |
326 | ||
327 | static int put_rtax(struct nlattr *mx, int len, int type, u32 value) | |
328 | { | |
329 | struct nlattr *nla; | |
330 | ||
331 | nla = (struct nlattr *) ((char *) mx + len); | |
332 | nla->nla_type = type; | |
333 | nla->nla_len = nla_attr_size(4); | |
334 | *(u32 *) nla_data(nla) = value; | |
335 | ||
336 | return len + nla_total_size(4); | |
337 | } | |
338 | ||
4b5d47d4 | 339 | static int rtentry_to_fib_config(struct net *net, int cmd, struct rtentry *rt, |
4e902c57 TG |
340 | struct fib_config *cfg) |
341 | { | |
6d85c10a | 342 | __be32 addr; |
4e902c57 TG |
343 | int plen; |
344 | ||
345 | memset(cfg, 0, sizeof(*cfg)); | |
4b5d47d4 | 346 | cfg->fc_nlinfo.nl_net = net; |
4e902c57 TG |
347 | |
348 | if (rt->rt_dst.sa_family != AF_INET) | |
349 | return -EAFNOSUPPORT; | |
350 | ||
351 | /* | |
352 | * Check mask for validity: | |
353 | * a) it must be contiguous. | |
354 | * b) destination must have all host bits clear. | |
355 | * c) if application forgot to set correct family (AF_INET), | |
356 | * reject request unless it is absolutely clear i.e. | |
357 | * both family and mask are zero. | |
358 | */ | |
359 | plen = 32; | |
360 | addr = sk_extract_addr(&rt->rt_dst); | |
361 | if (!(rt->rt_flags & RTF_HOST)) { | |
81f7bf6c | 362 | __be32 mask = sk_extract_addr(&rt->rt_genmask); |
4e902c57 TG |
363 | |
364 | if (rt->rt_genmask.sa_family != AF_INET) { | |
365 | if (mask || rt->rt_genmask.sa_family) | |
366 | return -EAFNOSUPPORT; | |
367 | } | |
368 | ||
369 | if (bad_mask(mask, addr)) | |
370 | return -EINVAL; | |
371 | ||
372 | plen = inet_mask_len(mask); | |
373 | } | |
374 | ||
375 | cfg->fc_dst_len = plen; | |
376 | cfg->fc_dst = addr; | |
377 | ||
378 | if (cmd != SIOCDELRT) { | |
379 | cfg->fc_nlflags = NLM_F_CREATE; | |
380 | cfg->fc_protocol = RTPROT_BOOT; | |
381 | } | |
382 | ||
383 | if (rt->rt_metric) | |
384 | cfg->fc_priority = rt->rt_metric - 1; | |
385 | ||
386 | if (rt->rt_flags & RTF_REJECT) { | |
387 | cfg->fc_scope = RT_SCOPE_HOST; | |
388 | cfg->fc_type = RTN_UNREACHABLE; | |
389 | return 0; | |
390 | } | |
391 | ||
392 | cfg->fc_scope = RT_SCOPE_NOWHERE; | |
393 | cfg->fc_type = RTN_UNICAST; | |
394 | ||
395 | if (rt->rt_dev) { | |
396 | char *colon; | |
397 | struct net_device *dev; | |
398 | char devname[IFNAMSIZ]; | |
399 | ||
400 | if (copy_from_user(devname, rt->rt_dev, IFNAMSIZ-1)) | |
401 | return -EFAULT; | |
402 | ||
403 | devname[IFNAMSIZ-1] = 0; | |
404 | colon = strchr(devname, ':'); | |
405 | if (colon) | |
406 | *colon = 0; | |
4b5d47d4 | 407 | dev = __dev_get_by_name(net, devname); |
4e902c57 TG |
408 | if (!dev) |
409 | return -ENODEV; | |
410 | cfg->fc_oif = dev->ifindex; | |
411 | if (colon) { | |
412 | struct in_ifaddr *ifa; | |
413 | struct in_device *in_dev = __in_dev_get_rtnl(dev); | |
414 | if (!in_dev) | |
415 | return -ENODEV; | |
416 | *colon = ':'; | |
417 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) | |
418 | if (strcmp(ifa->ifa_label, devname) == 0) | |
419 | break; | |
420 | if (ifa == NULL) | |
421 | return -ENODEV; | |
422 | cfg->fc_prefsrc = ifa->ifa_local; | |
423 | } | |
424 | } | |
425 | ||
426 | addr = sk_extract_addr(&rt->rt_gateway); | |
427 | if (rt->rt_gateway.sa_family == AF_INET && addr) { | |
428 | cfg->fc_gw = addr; | |
429 | if (rt->rt_flags & RTF_GATEWAY && | |
4b5d47d4 | 430 | inet_addr_type(net, addr) == RTN_UNICAST) |
4e902c57 TG |
431 | cfg->fc_scope = RT_SCOPE_UNIVERSE; |
432 | } | |
433 | ||
434 | if (cmd == SIOCDELRT) | |
435 | return 0; | |
436 | ||
437 | if (rt->rt_flags & RTF_GATEWAY && !cfg->fc_gw) | |
438 | return -EINVAL; | |
439 | ||
440 | if (cfg->fc_scope == RT_SCOPE_NOWHERE) | |
441 | cfg->fc_scope = RT_SCOPE_LINK; | |
442 | ||
443 | if (rt->rt_flags & (RTF_MTU | RTF_WINDOW | RTF_IRTT)) { | |
444 | struct nlattr *mx; | |
445 | int len = 0; | |
446 | ||
447 | mx = kzalloc(3 * nla_total_size(4), GFP_KERNEL); | |
e905a9ed | 448 | if (mx == NULL) |
4e902c57 TG |
449 | return -ENOMEM; |
450 | ||
451 | if (rt->rt_flags & RTF_MTU) | |
452 | len = put_rtax(mx, len, RTAX_ADVMSS, rt->rt_mtu - 40); | |
453 | ||
454 | if (rt->rt_flags & RTF_WINDOW) | |
455 | len = put_rtax(mx, len, RTAX_WINDOW, rt->rt_window); | |
456 | ||
457 | if (rt->rt_flags & RTF_IRTT) | |
458 | len = put_rtax(mx, len, RTAX_RTT, rt->rt_irtt << 3); | |
459 | ||
460 | cfg->fc_mx = mx; | |
461 | cfg->fc_mx_len = len; | |
462 | } | |
463 | ||
464 | return 0; | |
465 | } | |
466 | ||
1da177e4 | 467 | /* |
6a31d2a9 ED |
468 | * Handle IP routing ioctl calls. |
469 | * These are used to manipulate the routing tables | |
1da177e4 | 470 | */ |
1bad118a | 471 | int ip_rt_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 | 472 | { |
4e902c57 TG |
473 | struct fib_config cfg; |
474 | struct rtentry rt; | |
1da177e4 | 475 | int err; |
1da177e4 LT |
476 | |
477 | switch (cmd) { | |
478 | case SIOCADDRT: /* Add a route */ | |
479 | case SIOCDELRT: /* Delete a route */ | |
480 | if (!capable(CAP_NET_ADMIN)) | |
481 | return -EPERM; | |
4e902c57 TG |
482 | |
483 | if (copy_from_user(&rt, arg, sizeof(rt))) | |
1da177e4 | 484 | return -EFAULT; |
4e902c57 | 485 | |
1da177e4 | 486 | rtnl_lock(); |
1bad118a | 487 | err = rtentry_to_fib_config(net, cmd, &rt, &cfg); |
1da177e4 | 488 | if (err == 0) { |
4e902c57 TG |
489 | struct fib_table *tb; |
490 | ||
1da177e4 | 491 | if (cmd == SIOCDELRT) { |
1bad118a | 492 | tb = fib_get_table(net, cfg.fc_table); |
1da177e4 | 493 | if (tb) |
16c6cf8b | 494 | err = fib_table_delete(tb, &cfg); |
4e902c57 TG |
495 | else |
496 | err = -ESRCH; | |
1da177e4 | 497 | } else { |
1bad118a | 498 | tb = fib_new_table(net, cfg.fc_table); |
1da177e4 | 499 | if (tb) |
16c6cf8b | 500 | err = fib_table_insert(tb, &cfg); |
4e902c57 TG |
501 | else |
502 | err = -ENOBUFS; | |
1da177e4 | 503 | } |
4e902c57 TG |
504 | |
505 | /* allocated by rtentry_to_fib_config() */ | |
506 | kfree(cfg.fc_mx); | |
1da177e4 LT |
507 | } |
508 | rtnl_unlock(); | |
509 | return err; | |
510 | } | |
511 | return -EINVAL; | |
512 | } | |
513 | ||
6a31d2a9 | 514 | const struct nla_policy rtm_ipv4_policy[RTA_MAX + 1] = { |
4e902c57 TG |
515 | [RTA_DST] = { .type = NLA_U32 }, |
516 | [RTA_SRC] = { .type = NLA_U32 }, | |
517 | [RTA_IIF] = { .type = NLA_U32 }, | |
518 | [RTA_OIF] = { .type = NLA_U32 }, | |
519 | [RTA_GATEWAY] = { .type = NLA_U32 }, | |
520 | [RTA_PRIORITY] = { .type = NLA_U32 }, | |
521 | [RTA_PREFSRC] = { .type = NLA_U32 }, | |
522 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
5176f91e | 523 | [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, |
4e902c57 | 524 | [RTA_FLOW] = { .type = NLA_U32 }, |
4e902c57 TG |
525 | }; |
526 | ||
4b5d47d4 | 527 | static int rtm_to_fib_config(struct net *net, struct sk_buff *skb, |
6a31d2a9 | 528 | struct nlmsghdr *nlh, struct fib_config *cfg) |
1da177e4 | 529 | { |
4e902c57 TG |
530 | struct nlattr *attr; |
531 | int err, remaining; | |
532 | struct rtmsg *rtm; | |
533 | ||
534 | err = nlmsg_validate(nlh, sizeof(*rtm), RTA_MAX, rtm_ipv4_policy); | |
535 | if (err < 0) | |
536 | goto errout; | |
537 | ||
538 | memset(cfg, 0, sizeof(*cfg)); | |
539 | ||
540 | rtm = nlmsg_data(nlh); | |
4e902c57 | 541 | cfg->fc_dst_len = rtm->rtm_dst_len; |
4e902c57 TG |
542 | cfg->fc_tos = rtm->rtm_tos; |
543 | cfg->fc_table = rtm->rtm_table; | |
544 | cfg->fc_protocol = rtm->rtm_protocol; | |
545 | cfg->fc_scope = rtm->rtm_scope; | |
546 | cfg->fc_type = rtm->rtm_type; | |
547 | cfg->fc_flags = rtm->rtm_flags; | |
548 | cfg->fc_nlflags = nlh->nlmsg_flags; | |
549 | ||
550 | cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid; | |
551 | cfg->fc_nlinfo.nlh = nlh; | |
4b5d47d4 | 552 | cfg->fc_nlinfo.nl_net = net; |
4e902c57 | 553 | |
a0ee18b9 TG |
554 | if (cfg->fc_type > RTN_MAX) { |
555 | err = -EINVAL; | |
556 | goto errout; | |
557 | } | |
558 | ||
4e902c57 | 559 | nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), remaining) { |
8f4c1f9b | 560 | switch (nla_type(attr)) { |
4e902c57 | 561 | case RTA_DST: |
17fb2c64 | 562 | cfg->fc_dst = nla_get_be32(attr); |
4e902c57 | 563 | break; |
4e902c57 TG |
564 | case RTA_OIF: |
565 | cfg->fc_oif = nla_get_u32(attr); | |
566 | break; | |
567 | case RTA_GATEWAY: | |
17fb2c64 | 568 | cfg->fc_gw = nla_get_be32(attr); |
4e902c57 TG |
569 | break; |
570 | case RTA_PRIORITY: | |
571 | cfg->fc_priority = nla_get_u32(attr); | |
572 | break; | |
573 | case RTA_PREFSRC: | |
17fb2c64 | 574 | cfg->fc_prefsrc = nla_get_be32(attr); |
4e902c57 TG |
575 | break; |
576 | case RTA_METRICS: | |
577 | cfg->fc_mx = nla_data(attr); | |
578 | cfg->fc_mx_len = nla_len(attr); | |
579 | break; | |
580 | case RTA_MULTIPATH: | |
581 | cfg->fc_mp = nla_data(attr); | |
582 | cfg->fc_mp_len = nla_len(attr); | |
583 | break; | |
584 | case RTA_FLOW: | |
585 | cfg->fc_flow = nla_get_u32(attr); | |
586 | break; | |
4e902c57 TG |
587 | case RTA_TABLE: |
588 | cfg->fc_table = nla_get_u32(attr); | |
589 | break; | |
1da177e4 LT |
590 | } |
591 | } | |
4e902c57 | 592 | |
1da177e4 | 593 | return 0; |
4e902c57 TG |
594 | errout: |
595 | return err; | |
1da177e4 LT |
596 | } |
597 | ||
6ed2533e | 598 | static int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) |
1da177e4 | 599 | { |
3b1e0a65 | 600 | struct net *net = sock_net(skb->sk); |
4e902c57 TG |
601 | struct fib_config cfg; |
602 | struct fib_table *tb; | |
603 | int err; | |
1da177e4 | 604 | |
4b5d47d4 | 605 | err = rtm_to_fib_config(net, skb, nlh, &cfg); |
4e902c57 TG |
606 | if (err < 0) |
607 | goto errout; | |
1da177e4 | 608 | |
8ad4942c | 609 | tb = fib_get_table(net, cfg.fc_table); |
4e902c57 TG |
610 | if (tb == NULL) { |
611 | err = -ESRCH; | |
612 | goto errout; | |
613 | } | |
614 | ||
16c6cf8b | 615 | err = fib_table_delete(tb, &cfg); |
4e902c57 TG |
616 | errout: |
617 | return err; | |
1da177e4 LT |
618 | } |
619 | ||
6ed2533e | 620 | static int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) |
1da177e4 | 621 | { |
3b1e0a65 | 622 | struct net *net = sock_net(skb->sk); |
4e902c57 TG |
623 | struct fib_config cfg; |
624 | struct fib_table *tb; | |
625 | int err; | |
1da177e4 | 626 | |
4b5d47d4 | 627 | err = rtm_to_fib_config(net, skb, nlh, &cfg); |
4e902c57 TG |
628 | if (err < 0) |
629 | goto errout; | |
1da177e4 | 630 | |
226b0b4a | 631 | tb = fib_new_table(net, cfg.fc_table); |
4e902c57 TG |
632 | if (tb == NULL) { |
633 | err = -ENOBUFS; | |
634 | goto errout; | |
635 | } | |
636 | ||
16c6cf8b | 637 | err = fib_table_insert(tb, &cfg); |
4e902c57 TG |
638 | errout: |
639 | return err; | |
1da177e4 LT |
640 | } |
641 | ||
63f3444f | 642 | static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4 | 643 | { |
3b1e0a65 | 644 | struct net *net = sock_net(skb->sk); |
1af5a8c4 PM |
645 | unsigned int h, s_h; |
646 | unsigned int e = 0, s_e; | |
1da177e4 | 647 | struct fib_table *tb; |
1af5a8c4 | 648 | struct hlist_node *node; |
e4aef8ae | 649 | struct hlist_head *head; |
1af5a8c4 | 650 | int dumped = 0; |
1da177e4 | 651 | |
be403ea1 TG |
652 | if (nlmsg_len(cb->nlh) >= sizeof(struct rtmsg) && |
653 | ((struct rtmsg *) nlmsg_data(cb->nlh))->rtm_flags & RTM_F_CLONED) | |
1da177e4 LT |
654 | return ip_rt_dump(skb, cb); |
655 | ||
1af5a8c4 PM |
656 | s_h = cb->args[0]; |
657 | s_e = cb->args[1]; | |
658 | ||
659 | for (h = s_h; h < FIB_TABLE_HASHSZ; h++, s_e = 0) { | |
660 | e = 0; | |
e4aef8ae DL |
661 | head = &net->ipv4.fib_table_hash[h]; |
662 | hlist_for_each_entry(tb, node, head, tb_hlist) { | |
1af5a8c4 PM |
663 | if (e < s_e) |
664 | goto next; | |
665 | if (dumped) | |
666 | memset(&cb->args[2], 0, sizeof(cb->args) - | |
e905a9ed | 667 | 2 * sizeof(cb->args[0])); |
16c6cf8b | 668 | if (fib_table_dump(tb, skb, cb) < 0) |
1af5a8c4 PM |
669 | goto out; |
670 | dumped = 1; | |
671 | next: | |
672 | e++; | |
673 | } | |
1da177e4 | 674 | } |
1af5a8c4 PM |
675 | out: |
676 | cb->args[1] = e; | |
677 | cb->args[0] = h; | |
1da177e4 LT |
678 | |
679 | return skb->len; | |
680 | } | |
681 | ||
682 | /* Prepare and feed intra-kernel routing request. | |
6a31d2a9 ED |
683 | * Really, it should be netlink message, but :-( netlink |
684 | * can be not configured, so that we feed it directly | |
685 | * to fib engine. It is legal, because all events occur | |
686 | * only when netlink is already locked. | |
1da177e4 | 687 | */ |
81f7bf6c | 688 | static void fib_magic(int cmd, int type, __be32 dst, int dst_len, struct in_ifaddr *ifa) |
1da177e4 | 689 | { |
c346dca1 | 690 | struct net *net = dev_net(ifa->ifa_dev->dev); |
4e902c57 TG |
691 | struct fib_table *tb; |
692 | struct fib_config cfg = { | |
693 | .fc_protocol = RTPROT_KERNEL, | |
694 | .fc_type = type, | |
695 | .fc_dst = dst, | |
696 | .fc_dst_len = dst_len, | |
697 | .fc_prefsrc = ifa->ifa_local, | |
698 | .fc_oif = ifa->ifa_dev->dev->ifindex, | |
699 | .fc_nlflags = NLM_F_CREATE | NLM_F_APPEND, | |
4d1169c1 | 700 | .fc_nlinfo = { |
4b5d47d4 | 701 | .nl_net = net, |
4d1169c1 | 702 | }, |
4e902c57 | 703 | }; |
1da177e4 LT |
704 | |
705 | if (type == RTN_UNICAST) | |
4b5d47d4 | 706 | tb = fib_new_table(net, RT_TABLE_MAIN); |
1da177e4 | 707 | else |
4b5d47d4 | 708 | tb = fib_new_table(net, RT_TABLE_LOCAL); |
1da177e4 LT |
709 | |
710 | if (tb == NULL) | |
711 | return; | |
712 | ||
4e902c57 | 713 | cfg.fc_table = tb->tb_id; |
1da177e4 | 714 | |
4e902c57 TG |
715 | if (type != RTN_LOCAL) |
716 | cfg.fc_scope = RT_SCOPE_LINK; | |
717 | else | |
718 | cfg.fc_scope = RT_SCOPE_HOST; | |
1da177e4 LT |
719 | |
720 | if (cmd == RTM_NEWROUTE) | |
16c6cf8b | 721 | fib_table_insert(tb, &cfg); |
1da177e4 | 722 | else |
16c6cf8b | 723 | fib_table_delete(tb, &cfg); |
1da177e4 LT |
724 | } |
725 | ||
0ff60a45 | 726 | void fib_add_ifaddr(struct in_ifaddr *ifa) |
1da177e4 LT |
727 | { |
728 | struct in_device *in_dev = ifa->ifa_dev; | |
729 | struct net_device *dev = in_dev->dev; | |
730 | struct in_ifaddr *prim = ifa; | |
a144ea4b AV |
731 | __be32 mask = ifa->ifa_mask; |
732 | __be32 addr = ifa->ifa_local; | |
6a31d2a9 | 733 | __be32 prefix = ifa->ifa_address & mask; |
1da177e4 | 734 | |
6a31d2a9 | 735 | if (ifa->ifa_flags & IFA_F_SECONDARY) { |
1da177e4 LT |
736 | prim = inet_ifa_byprefix(in_dev, prefix, mask); |
737 | if (prim == NULL) { | |
058bd4d2 | 738 | pr_warn("%s: bug: prim == NULL\n", __func__); |
1da177e4 LT |
739 | return; |
740 | } | |
741 | } | |
742 | ||
743 | fib_magic(RTM_NEWROUTE, RTN_LOCAL, addr, 32, prim); | |
744 | ||
6a31d2a9 | 745 | if (!(dev->flags & IFF_UP)) |
1da177e4 LT |
746 | return; |
747 | ||
748 | /* Add broadcast address, if it is explicitly assigned. */ | |
a144ea4b | 749 | if (ifa->ifa_broadcast && ifa->ifa_broadcast != htonl(0xFFFFFFFF)) |
1da177e4 LT |
750 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); |
751 | ||
6a31d2a9 | 752 | if (!ipv4_is_zeronet(prefix) && !(ifa->ifa_flags & IFA_F_SECONDARY) && |
1da177e4 | 753 | (prefix != addr || ifa->ifa_prefixlen < 32)) { |
6a31d2a9 ED |
754 | fib_magic(RTM_NEWROUTE, |
755 | dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST, | |
756 | prefix, ifa->ifa_prefixlen, prim); | |
1da177e4 LT |
757 | |
758 | /* Add network specific broadcasts, when it takes a sense */ | |
759 | if (ifa->ifa_prefixlen < 31) { | |
760 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix, 32, prim); | |
6a31d2a9 ED |
761 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix | ~mask, |
762 | 32, prim); | |
1da177e4 LT |
763 | } |
764 | } | |
765 | } | |
766 | ||
e6abbaa2 JA |
767 | /* Delete primary or secondary address. |
768 | * Optionally, on secondary address promotion consider the addresses | |
769 | * from subnet iprim as deleted, even if they are in device list. | |
770 | * In this case the secondary ifa can be in device list. | |
771 | */ | |
772 | void fib_del_ifaddr(struct in_ifaddr *ifa, struct in_ifaddr *iprim) | |
1da177e4 LT |
773 | { |
774 | struct in_device *in_dev = ifa->ifa_dev; | |
775 | struct net_device *dev = in_dev->dev; | |
776 | struct in_ifaddr *ifa1; | |
e6abbaa2 | 777 | struct in_ifaddr *prim = ifa, *prim1 = NULL; |
6a31d2a9 ED |
778 | __be32 brd = ifa->ifa_address | ~ifa->ifa_mask; |
779 | __be32 any = ifa->ifa_address & ifa->ifa_mask; | |
1da177e4 LT |
780 | #define LOCAL_OK 1 |
781 | #define BRD_OK 2 | |
782 | #define BRD0_OK 4 | |
783 | #define BRD1_OK 8 | |
95c96174 | 784 | unsigned int ok = 0; |
e6abbaa2 JA |
785 | int subnet = 0; /* Primary network */ |
786 | int gone = 1; /* Address is missing */ | |
787 | int same_prefsrc = 0; /* Another primary with same IP */ | |
1da177e4 | 788 | |
e6abbaa2 | 789 | if (ifa->ifa_flags & IFA_F_SECONDARY) { |
1da177e4 LT |
790 | prim = inet_ifa_byprefix(in_dev, any, ifa->ifa_mask); |
791 | if (prim == NULL) { | |
058bd4d2 | 792 | pr_warn("%s: bug: prim == NULL\n", __func__); |
1da177e4 LT |
793 | return; |
794 | } | |
e6abbaa2 | 795 | if (iprim && iprim != prim) { |
058bd4d2 | 796 | pr_warn("%s: bug: iprim != prim\n", __func__); |
e6abbaa2 JA |
797 | return; |
798 | } | |
799 | } else if (!ipv4_is_zeronet(any) && | |
800 | (any != ifa->ifa_local || ifa->ifa_prefixlen < 32)) { | |
801 | fib_magic(RTM_DELROUTE, | |
802 | dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST, | |
803 | any, ifa->ifa_prefixlen, prim); | |
804 | subnet = 1; | |
1da177e4 LT |
805 | } |
806 | ||
807 | /* Deletion is more complicated than add. | |
6a31d2a9 ED |
808 | * We should take care of not to delete too much :-) |
809 | * | |
810 | * Scan address list to be sure that addresses are really gone. | |
1da177e4 LT |
811 | */ |
812 | ||
813 | for (ifa1 = in_dev->ifa_list; ifa1; ifa1 = ifa1->ifa_next) { | |
e6abbaa2 JA |
814 | if (ifa1 == ifa) { |
815 | /* promotion, keep the IP */ | |
816 | gone = 0; | |
817 | continue; | |
818 | } | |
819 | /* Ignore IFAs from our subnet */ | |
820 | if (iprim && ifa1->ifa_mask == iprim->ifa_mask && | |
821 | inet_ifa_match(ifa1->ifa_address, iprim)) | |
822 | continue; | |
823 | ||
824 | /* Ignore ifa1 if it uses different primary IP (prefsrc) */ | |
825 | if (ifa1->ifa_flags & IFA_F_SECONDARY) { | |
826 | /* Another address from our subnet? */ | |
827 | if (ifa1->ifa_mask == prim->ifa_mask && | |
828 | inet_ifa_match(ifa1->ifa_address, prim)) | |
829 | prim1 = prim; | |
830 | else { | |
831 | /* We reached the secondaries, so | |
832 | * same_prefsrc should be determined. | |
833 | */ | |
834 | if (!same_prefsrc) | |
835 | continue; | |
836 | /* Search new prim1 if ifa1 is not | |
837 | * using the current prim1 | |
838 | */ | |
839 | if (!prim1 || | |
840 | ifa1->ifa_mask != prim1->ifa_mask || | |
841 | !inet_ifa_match(ifa1->ifa_address, prim1)) | |
842 | prim1 = inet_ifa_byprefix(in_dev, | |
843 | ifa1->ifa_address, | |
844 | ifa1->ifa_mask); | |
845 | if (!prim1) | |
846 | continue; | |
847 | if (prim1->ifa_local != prim->ifa_local) | |
848 | continue; | |
849 | } | |
850 | } else { | |
851 | if (prim->ifa_local != ifa1->ifa_local) | |
852 | continue; | |
853 | prim1 = ifa1; | |
854 | if (prim != prim1) | |
855 | same_prefsrc = 1; | |
856 | } | |
1da177e4 LT |
857 | if (ifa->ifa_local == ifa1->ifa_local) |
858 | ok |= LOCAL_OK; | |
859 | if (ifa->ifa_broadcast == ifa1->ifa_broadcast) | |
860 | ok |= BRD_OK; | |
861 | if (brd == ifa1->ifa_broadcast) | |
862 | ok |= BRD1_OK; | |
863 | if (any == ifa1->ifa_broadcast) | |
864 | ok |= BRD0_OK; | |
e6abbaa2 JA |
865 | /* primary has network specific broadcasts */ |
866 | if (prim1 == ifa1 && ifa1->ifa_prefixlen < 31) { | |
867 | __be32 brd1 = ifa1->ifa_address | ~ifa1->ifa_mask; | |
868 | __be32 any1 = ifa1->ifa_address & ifa1->ifa_mask; | |
869 | ||
870 | if (!ipv4_is_zeronet(any1)) { | |
871 | if (ifa->ifa_broadcast == brd1 || | |
872 | ifa->ifa_broadcast == any1) | |
873 | ok |= BRD_OK; | |
874 | if (brd == brd1 || brd == any1) | |
875 | ok |= BRD1_OK; | |
876 | if (any == brd1 || any == any1) | |
877 | ok |= BRD0_OK; | |
878 | } | |
879 | } | |
1da177e4 LT |
880 | } |
881 | ||
6a31d2a9 | 882 | if (!(ok & BRD_OK)) |
1da177e4 | 883 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); |
e6abbaa2 JA |
884 | if (subnet && ifa->ifa_prefixlen < 31) { |
885 | if (!(ok & BRD1_OK)) | |
886 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, brd, 32, prim); | |
887 | if (!(ok & BRD0_OK)) | |
888 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, any, 32, prim); | |
889 | } | |
6a31d2a9 | 890 | if (!(ok & LOCAL_OK)) { |
1da177e4 LT |
891 | fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 32, prim); |
892 | ||
893 | /* Check, that this local address finally disappeared. */ | |
e6abbaa2 JA |
894 | if (gone && |
895 | inet_addr_type(dev_net(dev), ifa->ifa_local) != RTN_LOCAL) { | |
1da177e4 | 896 | /* And the last, but not the least thing. |
6a31d2a9 ED |
897 | * We must flush stray FIB entries. |
898 | * | |
899 | * First of all, we scan fib_info list searching | |
900 | * for stray nexthop entries, then ignite fib_flush. | |
901 | */ | |
c346dca1 YH |
902 | if (fib_sync_down_addr(dev_net(dev), ifa->ifa_local)) |
903 | fib_flush(dev_net(dev)); | |
1da177e4 LT |
904 | } |
905 | } | |
906 | #undef LOCAL_OK | |
907 | #undef BRD_OK | |
908 | #undef BRD0_OK | |
909 | #undef BRD1_OK | |
910 | } | |
911 | ||
6a31d2a9 | 912 | static void nl_fib_lookup(struct fib_result_nl *frn, struct fib_table *tb) |
246955fe | 913 | { |
e905a9ed | 914 | |
246955fe | 915 | struct fib_result res; |
9ade2286 DM |
916 | struct flowi4 fl4 = { |
917 | .flowi4_mark = frn->fl_mark, | |
918 | .daddr = frn->fl_addr, | |
919 | .flowi4_tos = frn->fl_tos, | |
920 | .flowi4_scope = frn->fl_scope, | |
6a31d2a9 | 921 | }; |
1194ed0a | 922 | |
912a41a4 SV |
923 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
924 | res.r = NULL; | |
925 | #endif | |
926 | ||
1194ed0a | 927 | frn->err = -ENOENT; |
246955fe RO |
928 | if (tb) { |
929 | local_bh_disable(); | |
930 | ||
931 | frn->tb_id = tb->tb_id; | |
ebc0ffae | 932 | rcu_read_lock(); |
9ade2286 | 933 | frn->err = fib_table_lookup(tb, &fl4, &res, FIB_LOOKUP_NOREF); |
246955fe RO |
934 | |
935 | if (!frn->err) { | |
936 | frn->prefixlen = res.prefixlen; | |
937 | frn->nh_sel = res.nh_sel; | |
938 | frn->type = res.type; | |
939 | frn->scope = res.scope; | |
940 | } | |
ebc0ffae | 941 | rcu_read_unlock(); |
246955fe RO |
942 | local_bh_enable(); |
943 | } | |
944 | } | |
945 | ||
28f7b036 | 946 | static void nl_fib_input(struct sk_buff *skb) |
246955fe | 947 | { |
6bd48fcf | 948 | struct net *net; |
246955fe | 949 | struct fib_result_nl *frn; |
28f7b036 | 950 | struct nlmsghdr *nlh; |
246955fe | 951 | struct fib_table *tb; |
28f7b036 | 952 | u32 pid; |
1194ed0a | 953 | |
3b1e0a65 | 954 | net = sock_net(skb->sk); |
b529ccf2 | 955 | nlh = nlmsg_hdr(skb); |
ea86575e | 956 | if (skb->len < NLMSG_SPACE(0) || skb->len < nlh->nlmsg_len || |
d883a036 | 957 | nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*frn))) |
ea86575e | 958 | return; |
d883a036 DL |
959 | |
960 | skb = skb_clone(skb, GFP_KERNEL); | |
961 | if (skb == NULL) | |
962 | return; | |
963 | nlh = nlmsg_hdr(skb); | |
e905a9ed | 964 | |
246955fe | 965 | frn = (struct fib_result_nl *) NLMSG_DATA(nlh); |
6bd48fcf | 966 | tb = fib_get_table(net, frn->tb_id_in); |
246955fe RO |
967 | |
968 | nl_fib_lookup(frn, tb); | |
e905a9ed | 969 | |
6a31d2a9 ED |
970 | pid = NETLINK_CB(skb).pid; /* pid of sending process */ |
971 | NETLINK_CB(skb).pid = 0; /* from kernel */ | |
ac6d439d | 972 | NETLINK_CB(skb).dst_group = 0; /* unicast */ |
6bd48fcf | 973 | netlink_unicast(net->ipv4.fibnl, skb, pid, MSG_DONTWAIT); |
e905a9ed | 974 | } |
246955fe | 975 | |
2c8c1e72 | 976 | static int __net_init nl_fib_lookup_init(struct net *net) |
246955fe | 977 | { |
6bd48fcf | 978 | struct sock *sk; |
a31f2d17 PNA |
979 | struct netlink_kernel_cfg cfg = { |
980 | .input = nl_fib_input, | |
981 | }; | |
982 | ||
983 | sk = netlink_kernel_create(net, NETLINK_FIB_LOOKUP, THIS_MODULE, &cfg); | |
6bd48fcf | 984 | if (sk == NULL) |
7b1a74fd | 985 | return -EAFNOSUPPORT; |
6bd48fcf | 986 | net->ipv4.fibnl = sk; |
7b1a74fd DL |
987 | return 0; |
988 | } | |
989 | ||
990 | static void nl_fib_lookup_exit(struct net *net) | |
991 | { | |
b7c6ba6e | 992 | netlink_kernel_release(net->ipv4.fibnl); |
775516bf | 993 | net->ipv4.fibnl = NULL; |
246955fe RO |
994 | } |
995 | ||
e2ce1468 | 996 | static void fib_disable_ip(struct net_device *dev, int force, int delay) |
1da177e4 | 997 | { |
85326fa5 | 998 | if (fib_sync_down_dev(dev, force)) |
c346dca1 | 999 | fib_flush(dev_net(dev)); |
e2ce1468 | 1000 | rt_cache_flush(dev_net(dev), delay); |
1da177e4 LT |
1001 | arp_ifdown(dev); |
1002 | } | |
1003 | ||
1004 | static int fib_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1005 | { | |
6ed2533e | 1006 | struct in_ifaddr *ifa = (struct in_ifaddr *)ptr; |
76e6ebfb | 1007 | struct net_device *dev = ifa->ifa_dev->dev; |
436c3b66 | 1008 | struct net *net = dev_net(dev); |
1da177e4 LT |
1009 | |
1010 | switch (event) { | |
1011 | case NETDEV_UP: | |
1012 | fib_add_ifaddr(ifa); | |
1013 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
76e6ebfb | 1014 | fib_sync_up(dev); |
1da177e4 | 1015 | #endif |
436c3b66 | 1016 | atomic_inc(&net->ipv4.dev_addr_genid); |
76e6ebfb | 1017 | rt_cache_flush(dev_net(dev), -1); |
1da177e4 LT |
1018 | break; |
1019 | case NETDEV_DOWN: | |
e6abbaa2 | 1020 | fib_del_ifaddr(ifa, NULL); |
436c3b66 | 1021 | atomic_inc(&net->ipv4.dev_addr_genid); |
9fcc2e8a | 1022 | if (ifa->ifa_dev->ifa_list == NULL) { |
1da177e4 | 1023 | /* Last address was deleted from this interface. |
6a31d2a9 | 1024 | * Disable IP. |
1da177e4 | 1025 | */ |
e2ce1468 | 1026 | fib_disable_ip(dev, 1, 0); |
1da177e4 | 1027 | } else { |
76e6ebfb | 1028 | rt_cache_flush(dev_net(dev), -1); |
1da177e4 LT |
1029 | } |
1030 | break; | |
1031 | } | |
1032 | return NOTIFY_DONE; | |
1033 | } | |
1034 | ||
1035 | static int fib_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1036 | { | |
1037 | struct net_device *dev = ptr; | |
e5ed6399 | 1038 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
436c3b66 | 1039 | struct net *net = dev_net(dev); |
1da177e4 LT |
1040 | |
1041 | if (event == NETDEV_UNREGISTER) { | |
e2ce1468 | 1042 | fib_disable_ip(dev, 2, -1); |
1da177e4 LT |
1043 | return NOTIFY_DONE; |
1044 | } | |
1045 | ||
1046 | if (!in_dev) | |
1047 | return NOTIFY_DONE; | |
1048 | ||
1049 | switch (event) { | |
1050 | case NETDEV_UP: | |
1051 | for_ifa(in_dev) { | |
1052 | fib_add_ifaddr(ifa); | |
1053 | } endfor_ifa(in_dev); | |
1054 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
1055 | fib_sync_up(dev); | |
1056 | #endif | |
436c3b66 | 1057 | atomic_inc(&net->ipv4.dev_addr_genid); |
76e6ebfb | 1058 | rt_cache_flush(dev_net(dev), -1); |
1da177e4 LT |
1059 | break; |
1060 | case NETDEV_DOWN: | |
e2ce1468 | 1061 | fib_disable_ip(dev, 0, 0); |
1da177e4 LT |
1062 | break; |
1063 | case NETDEV_CHANGEMTU: | |
1064 | case NETDEV_CHANGE: | |
76e6ebfb | 1065 | rt_cache_flush(dev_net(dev), 0); |
1da177e4 | 1066 | break; |
a5ee1551 | 1067 | case NETDEV_UNREGISTER_BATCH: |
6561a3b1 DM |
1068 | /* The batch unregister is only called on the first |
1069 | * device in the list of devices being unregistered. | |
1070 | * Therefore we should not pass dev_net(dev) in here. | |
1071 | */ | |
1072 | rt_cache_flush_batch(NULL); | |
a5ee1551 | 1073 | break; |
1da177e4 LT |
1074 | } |
1075 | return NOTIFY_DONE; | |
1076 | } | |
1077 | ||
1078 | static struct notifier_block fib_inetaddr_notifier = { | |
6ed2533e | 1079 | .notifier_call = fib_inetaddr_event, |
1da177e4 LT |
1080 | }; |
1081 | ||
1082 | static struct notifier_block fib_netdev_notifier = { | |
6ed2533e | 1083 | .notifier_call = fib_netdev_event, |
1da177e4 LT |
1084 | }; |
1085 | ||
7b1a74fd | 1086 | static int __net_init ip_fib_net_init(struct net *net) |
1da177e4 | 1087 | { |
dce5cbee | 1088 | int err; |
10da66f7 ED |
1089 | size_t size = sizeof(struct hlist_head) * FIB_TABLE_HASHSZ; |
1090 | ||
1091 | /* Avoid false sharing : Use at least a full cache line */ | |
1092 | size = max_t(size_t, size, L1_CACHE_BYTES); | |
1af5a8c4 | 1093 | |
10da66f7 | 1094 | net->ipv4.fib_table_hash = kzalloc(size, GFP_KERNEL); |
e4aef8ae DL |
1095 | if (net->ipv4.fib_table_hash == NULL) |
1096 | return -ENOMEM; | |
1097 | ||
dce5cbee DL |
1098 | err = fib4_rules_init(net); |
1099 | if (err < 0) | |
1100 | goto fail; | |
1101 | return 0; | |
1102 | ||
1103 | fail: | |
1104 | kfree(net->ipv4.fib_table_hash); | |
1105 | return err; | |
7b1a74fd | 1106 | } |
1da177e4 | 1107 | |
2c8c1e72 | 1108 | static void ip_fib_net_exit(struct net *net) |
7b1a74fd DL |
1109 | { |
1110 | unsigned int i; | |
1111 | ||
1112 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
1113 | fib4_rules_exit(net); | |
1114 | #endif | |
1115 | ||
e2666f84 | 1116 | rtnl_lock(); |
7b1a74fd DL |
1117 | for (i = 0; i < FIB_TABLE_HASHSZ; i++) { |
1118 | struct fib_table *tb; | |
1119 | struct hlist_head *head; | |
1120 | struct hlist_node *node, *tmp; | |
63f3444f | 1121 | |
e4aef8ae | 1122 | head = &net->ipv4.fib_table_hash[i]; |
7b1a74fd DL |
1123 | hlist_for_each_entry_safe(tb, node, tmp, head, tb_hlist) { |
1124 | hlist_del(node); | |
16c6cf8b | 1125 | fib_table_flush(tb); |
4aa2c466 | 1126 | fib_free_table(tb); |
7b1a74fd DL |
1127 | } |
1128 | } | |
e2666f84 | 1129 | rtnl_unlock(); |
e4aef8ae | 1130 | kfree(net->ipv4.fib_table_hash); |
7b1a74fd DL |
1131 | } |
1132 | ||
1133 | static int __net_init fib_net_init(struct net *net) | |
1134 | { | |
1135 | int error; | |
1136 | ||
7b1a74fd DL |
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 | { | |
c7ac8679 GR |
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); | |
7b1a74fd DL |
1173 | |
1174 | register_pernet_subsys(&fib_net_ops); | |
1175 | register_netdevice_notifier(&fib_netdev_notifier); | |
1176 | register_inetaddr_notifier(&fib_inetaddr_notifier); | |
7f9b8052 | 1177 | |
5348ba85 | 1178 | fib_trie_init(); |
1da177e4 | 1179 | } |