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: semantics. | |
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 | 16 | #include <asm/uaccess.h> |
1da177e4 LT |
17 | #include <linux/bitops.h> |
18 | #include <linux/types.h> | |
19 | #include <linux/kernel.h> | |
20 | #include <linux/jiffies.h> | |
21 | #include <linux/mm.h> | |
22 | #include <linux/string.h> | |
23 | #include <linux/socket.h> | |
24 | #include <linux/sockios.h> | |
25 | #include <linux/errno.h> | |
26 | #include <linux/in.h> | |
27 | #include <linux/inet.h> | |
14c85021 | 28 | #include <linux/inetdevice.h> |
1da177e4 LT |
29 | #include <linux/netdevice.h> |
30 | #include <linux/if_arp.h> | |
31 | #include <linux/proc_fs.h> | |
32 | #include <linux/skbuff.h> | |
1da177e4 | 33 | #include <linux/init.h> |
5a0e3ad6 | 34 | #include <linux/slab.h> |
1da177e4 | 35 | |
14c85021 | 36 | #include <net/arp.h> |
1da177e4 LT |
37 | #include <net/ip.h> |
38 | #include <net/protocol.h> | |
39 | #include <net/route.h> | |
40 | #include <net/tcp.h> | |
41 | #include <net/sock.h> | |
42 | #include <net/ip_fib.h> | |
f21c7bc5 | 43 | #include <net/netlink.h> |
4e902c57 | 44 | #include <net/nexthop.h> |
1da177e4 LT |
45 | |
46 | #include "fib_lookup.h" | |
47 | ||
832b4c5e | 48 | static DEFINE_SPINLOCK(fib_info_lock); |
1da177e4 LT |
49 | static struct hlist_head *fib_info_hash; |
50 | static struct hlist_head *fib_info_laddrhash; | |
123b9731 | 51 | static unsigned int fib_info_hash_size; |
1da177e4 LT |
52 | static unsigned int fib_info_cnt; |
53 | ||
54 | #define DEVINDEX_HASHBITS 8 | |
55 | #define DEVINDEX_HASHSIZE (1U << DEVINDEX_HASHBITS) | |
56 | static struct hlist_head fib_info_devhash[DEVINDEX_HASHSIZE]; | |
57 | ||
58 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
59 | ||
60 | static DEFINE_SPINLOCK(fib_multipath_lock); | |
61 | ||
6a31d2a9 ED |
62 | #define for_nexthops(fi) { \ |
63 | int nhsel; const struct fib_nh *nh; \ | |
64 | for (nhsel = 0, nh = (fi)->fib_nh; \ | |
65 | nhsel < (fi)->fib_nhs; \ | |
66 | nh++, nhsel++) | |
67 | ||
68 | #define change_nexthops(fi) { \ | |
69 | int nhsel; struct fib_nh *nexthop_nh; \ | |
70 | for (nhsel = 0, nexthop_nh = (struct fib_nh *)((fi)->fib_nh); \ | |
71 | nhsel < (fi)->fib_nhs; \ | |
72 | nexthop_nh++, nhsel++) | |
1da177e4 LT |
73 | |
74 | #else /* CONFIG_IP_ROUTE_MULTIPATH */ | |
75 | ||
76 | /* Hope, that gcc will optimize it to get rid of dummy loop */ | |
77 | ||
6a31d2a9 ED |
78 | #define for_nexthops(fi) { \ |
79 | int nhsel; const struct fib_nh *nh = (fi)->fib_nh; \ | |
80 | for (nhsel = 0; nhsel < 1; nhsel++) | |
1da177e4 | 81 | |
6a31d2a9 ED |
82 | #define change_nexthops(fi) { \ |
83 | int nhsel; \ | |
84 | struct fib_nh *nexthop_nh = (struct fib_nh *)((fi)->fib_nh); \ | |
85 | for (nhsel = 0; nhsel < 1; nhsel++) | |
1da177e4 LT |
86 | |
87 | #endif /* CONFIG_IP_ROUTE_MULTIPATH */ | |
88 | ||
89 | #define endfor_nexthops(fi) } | |
90 | ||
91 | ||
3be0686b | 92 | const struct fib_prop fib_props[RTN_MAX + 1] = { |
6a31d2a9 | 93 | [RTN_UNSPEC] = { |
1da177e4 LT |
94 | .error = 0, |
95 | .scope = RT_SCOPE_NOWHERE, | |
6a31d2a9 ED |
96 | }, |
97 | [RTN_UNICAST] = { | |
1da177e4 LT |
98 | .error = 0, |
99 | .scope = RT_SCOPE_UNIVERSE, | |
6a31d2a9 ED |
100 | }, |
101 | [RTN_LOCAL] = { | |
1da177e4 LT |
102 | .error = 0, |
103 | .scope = RT_SCOPE_HOST, | |
6a31d2a9 ED |
104 | }, |
105 | [RTN_BROADCAST] = { | |
1da177e4 LT |
106 | .error = 0, |
107 | .scope = RT_SCOPE_LINK, | |
6a31d2a9 ED |
108 | }, |
109 | [RTN_ANYCAST] = { | |
1da177e4 LT |
110 | .error = 0, |
111 | .scope = RT_SCOPE_LINK, | |
6a31d2a9 ED |
112 | }, |
113 | [RTN_MULTICAST] = { | |
1da177e4 LT |
114 | .error = 0, |
115 | .scope = RT_SCOPE_UNIVERSE, | |
6a31d2a9 ED |
116 | }, |
117 | [RTN_BLACKHOLE] = { | |
1da177e4 LT |
118 | .error = -EINVAL, |
119 | .scope = RT_SCOPE_UNIVERSE, | |
6a31d2a9 ED |
120 | }, |
121 | [RTN_UNREACHABLE] = { | |
1da177e4 LT |
122 | .error = -EHOSTUNREACH, |
123 | .scope = RT_SCOPE_UNIVERSE, | |
6a31d2a9 ED |
124 | }, |
125 | [RTN_PROHIBIT] = { | |
1da177e4 LT |
126 | .error = -EACCES, |
127 | .scope = RT_SCOPE_UNIVERSE, | |
6a31d2a9 ED |
128 | }, |
129 | [RTN_THROW] = { | |
1da177e4 LT |
130 | .error = -EAGAIN, |
131 | .scope = RT_SCOPE_UNIVERSE, | |
6a31d2a9 ED |
132 | }, |
133 | [RTN_NAT] = { | |
1da177e4 LT |
134 | .error = -EINVAL, |
135 | .scope = RT_SCOPE_NOWHERE, | |
6a31d2a9 ED |
136 | }, |
137 | [RTN_XRESOLVE] = { | |
1da177e4 LT |
138 | .error = -EINVAL, |
139 | .scope = RT_SCOPE_NOWHERE, | |
6a31d2a9 | 140 | }, |
1da177e4 LT |
141 | }; |
142 | ||
c5038a83 DM |
143 | static void rt_fibinfo_free(struct rtable __rcu **rtp) |
144 | { | |
145 | struct rtable *rt = rcu_dereference_protected(*rtp, 1); | |
146 | ||
147 | if (!rt) | |
148 | return; | |
149 | ||
150 | /* Not even needed : RCU_INIT_POINTER(*rtp, NULL); | |
151 | * because we waited an RCU grace period before calling | |
152 | * free_fib_info_rcu() | |
153 | */ | |
154 | ||
155 | dst_free(&rt->dst); | |
156 | } | |
157 | ||
4895c771 DM |
158 | static void free_nh_exceptions(struct fib_nh *nh) |
159 | { | |
caa41527 | 160 | struct fnhe_hash_bucket *hash; |
4895c771 DM |
161 | int i; |
162 | ||
caa41527 ED |
163 | hash = rcu_dereference_protected(nh->nh_exceptions, 1); |
164 | if (!hash) | |
165 | return; | |
4895c771 DM |
166 | for (i = 0; i < FNHE_HASH_SIZE; i++) { |
167 | struct fib_nh_exception *fnhe; | |
168 | ||
5abf7f7e | 169 | fnhe = rcu_dereference_protected(hash[i].chain, 1); |
4895c771 DM |
170 | while (fnhe) { |
171 | struct fib_nh_exception *next; | |
172 | ||
5abf7f7e | 173 | next = rcu_dereference_protected(fnhe->fnhe_next, 1); |
c5038a83 | 174 | |
2ffae99d TT |
175 | rt_fibinfo_free(&fnhe->fnhe_rth_input); |
176 | rt_fibinfo_free(&fnhe->fnhe_rth_output); | |
c5038a83 | 177 | |
4895c771 DM |
178 | kfree(fnhe); |
179 | ||
180 | fnhe = next; | |
181 | } | |
182 | } | |
183 | kfree(hash); | |
184 | } | |
185 | ||
c5038a83 | 186 | static void rt_fibinfo_free_cpus(struct rtable __rcu * __percpu *rtp) |
d26b3a7c ED |
187 | { |
188 | int cpu; | |
189 | ||
190 | if (!rtp) | |
191 | return; | |
192 | ||
193 | for_each_possible_cpu(cpu) { | |
194 | struct rtable *rt; | |
195 | ||
196 | rt = rcu_dereference_protected(*per_cpu_ptr(rtp, cpu), 1); | |
197 | if (rt) | |
198 | dst_free(&rt->dst); | |
199 | } | |
200 | free_percpu(rtp); | |
201 | } | |
202 | ||
1da177e4 | 203 | /* Release a nexthop info record */ |
19c1ea14 YZ |
204 | static void free_fib_info_rcu(struct rcu_head *head) |
205 | { | |
206 | struct fib_info *fi = container_of(head, struct fib_info, rcu); | |
207 | ||
e49cc0da YZ |
208 | change_nexthops(fi) { |
209 | if (nexthop_nh->nh_dev) | |
210 | dev_put(nexthop_nh->nh_dev); | |
caa41527 | 211 | free_nh_exceptions(nexthop_nh); |
c5038a83 DM |
212 | rt_fibinfo_free_cpus(nexthop_nh->nh_pcpu_rth_output); |
213 | rt_fibinfo_free(&nexthop_nh->nh_rth_input); | |
e49cc0da YZ |
214 | } endfor_nexthops(fi); |
215 | ||
216 | release_net(fi->fib_net); | |
19c1ea14 YZ |
217 | if (fi->fib_metrics != (u32 *) dst_default_metrics) |
218 | kfree(fi->fib_metrics); | |
219 | kfree(fi); | |
220 | } | |
1da177e4 LT |
221 | |
222 | void free_fib_info(struct fib_info *fi) | |
223 | { | |
224 | if (fi->fib_dead == 0) { | |
058bd4d2 | 225 | pr_warn("Freeing alive fib_info %p\n", fi); |
1da177e4 LT |
226 | return; |
227 | } | |
1da177e4 | 228 | fib_info_cnt--; |
7a9bc9b8 DM |
229 | #ifdef CONFIG_IP_ROUTE_CLASSID |
230 | change_nexthops(fi) { | |
231 | if (nexthop_nh->nh_tclassid) | |
f4530fa5 | 232 | fi->fib_net->ipv4.fib_num_tclassid_users--; |
7a9bc9b8 DM |
233 | } endfor_nexthops(fi); |
234 | #endif | |
19c1ea14 | 235 | call_rcu(&fi->rcu, free_fib_info_rcu); |
1da177e4 LT |
236 | } |
237 | ||
238 | void fib_release_info(struct fib_info *fi) | |
239 | { | |
832b4c5e | 240 | spin_lock_bh(&fib_info_lock); |
1da177e4 LT |
241 | if (fi && --fi->fib_treeref == 0) { |
242 | hlist_del(&fi->fib_hash); | |
243 | if (fi->fib_prefsrc) | |
244 | hlist_del(&fi->fib_lhash); | |
245 | change_nexthops(fi) { | |
71fceff0 | 246 | if (!nexthop_nh->nh_dev) |
1da177e4 | 247 | continue; |
71fceff0 | 248 | hlist_del(&nexthop_nh->nh_hash); |
1da177e4 LT |
249 | } endfor_nexthops(fi) |
250 | fi->fib_dead = 1; | |
251 | fib_info_put(fi); | |
252 | } | |
832b4c5e | 253 | spin_unlock_bh(&fib_info_lock); |
1da177e4 LT |
254 | } |
255 | ||
6a31d2a9 | 256 | static inline int nh_comp(const struct fib_info *fi, const struct fib_info *ofi) |
1da177e4 LT |
257 | { |
258 | const struct fib_nh *onh = ofi->fib_nh; | |
259 | ||
260 | for_nexthops(fi) { | |
261 | if (nh->nh_oif != onh->nh_oif || | |
262 | nh->nh_gw != onh->nh_gw || | |
263 | nh->nh_scope != onh->nh_scope || | |
264 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
265 | nh->nh_weight != onh->nh_weight || | |
266 | #endif | |
c7066f70 | 267 | #ifdef CONFIG_IP_ROUTE_CLASSID |
1da177e4 LT |
268 | nh->nh_tclassid != onh->nh_tclassid || |
269 | #endif | |
6a31d2a9 | 270 | ((nh->nh_flags ^ onh->nh_flags) & ~RTNH_F_DEAD)) |
1da177e4 LT |
271 | return -1; |
272 | onh++; | |
273 | } endfor_nexthops(fi); | |
274 | return 0; | |
275 | } | |
276 | ||
88ebc72f DM |
277 | static inline unsigned int fib_devindex_hashfn(unsigned int val) |
278 | { | |
279 | unsigned int mask = DEVINDEX_HASHSIZE - 1; | |
280 | ||
281 | return (val ^ | |
282 | (val >> DEVINDEX_HASHBITS) ^ | |
283 | (val >> (DEVINDEX_HASHBITS * 2))) & mask; | |
284 | } | |
285 | ||
1da177e4 LT |
286 | static inline unsigned int fib_info_hashfn(const struct fib_info *fi) |
287 | { | |
123b9731 | 288 | unsigned int mask = (fib_info_hash_size - 1); |
1da177e4 LT |
289 | unsigned int val = fi->fib_nhs; |
290 | ||
37e826c5 | 291 | val ^= (fi->fib_protocol << 8) | fi->fib_scope; |
81f7bf6c | 292 | val ^= (__force u32)fi->fib_prefsrc; |
1da177e4 | 293 | val ^= fi->fib_priority; |
88ebc72f DM |
294 | for_nexthops(fi) { |
295 | val ^= fib_devindex_hashfn(nh->nh_oif); | |
296 | } endfor_nexthops(fi) | |
1da177e4 LT |
297 | |
298 | return (val ^ (val >> 7) ^ (val >> 12)) & mask; | |
299 | } | |
300 | ||
301 | static struct fib_info *fib_find_info(const struct fib_info *nfi) | |
302 | { | |
303 | struct hlist_head *head; | |
1da177e4 LT |
304 | struct fib_info *fi; |
305 | unsigned int hash; | |
306 | ||
307 | hash = fib_info_hashfn(nfi); | |
308 | head = &fib_info_hash[hash]; | |
309 | ||
b67bfe0d | 310 | hlist_for_each_entry(fi, head, fib_hash) { |
09ad9bc7 | 311 | if (!net_eq(fi->fib_net, nfi->fib_net)) |
4814bdbd | 312 | continue; |
1da177e4 LT |
313 | if (fi->fib_nhs != nfi->fib_nhs) |
314 | continue; | |
315 | if (nfi->fib_protocol == fi->fib_protocol && | |
37e826c5 | 316 | nfi->fib_scope == fi->fib_scope && |
1da177e4 LT |
317 | nfi->fib_prefsrc == fi->fib_prefsrc && |
318 | nfi->fib_priority == fi->fib_priority && | |
f4ef85bb | 319 | nfi->fib_type == fi->fib_type && |
1da177e4 | 320 | memcmp(nfi->fib_metrics, fi->fib_metrics, |
fcd13f42 | 321 | sizeof(u32) * RTAX_MAX) == 0 && |
6a31d2a9 | 322 | ((nfi->fib_flags ^ fi->fib_flags) & ~RTNH_F_DEAD) == 0 && |
1da177e4 LT |
323 | (nfi->fib_nhs == 0 || nh_comp(fi, nfi) == 0)) |
324 | return fi; | |
325 | } | |
326 | ||
327 | return NULL; | |
328 | } | |
329 | ||
1da177e4 | 330 | /* Check, that the gateway is already configured. |
6a31d2a9 | 331 | * Used only by redirect accept routine. |
1da177e4 | 332 | */ |
d878e72e | 333 | int ip_fib_check_default(__be32 gw, struct net_device *dev) |
1da177e4 LT |
334 | { |
335 | struct hlist_head *head; | |
1da177e4 LT |
336 | struct fib_nh *nh; |
337 | unsigned int hash; | |
338 | ||
832b4c5e | 339 | spin_lock(&fib_info_lock); |
1da177e4 LT |
340 | |
341 | hash = fib_devindex_hashfn(dev->ifindex); | |
342 | head = &fib_info_devhash[hash]; | |
b67bfe0d | 343 | hlist_for_each_entry(nh, head, nh_hash) { |
1da177e4 LT |
344 | if (nh->nh_dev == dev && |
345 | nh->nh_gw == gw && | |
6a31d2a9 | 346 | !(nh->nh_flags & RTNH_F_DEAD)) { |
832b4c5e | 347 | spin_unlock(&fib_info_lock); |
1da177e4 LT |
348 | return 0; |
349 | } | |
350 | } | |
351 | ||
832b4c5e | 352 | spin_unlock(&fib_info_lock); |
1da177e4 LT |
353 | |
354 | return -1; | |
355 | } | |
356 | ||
339bf98f TG |
357 | static inline size_t fib_nlmsg_size(struct fib_info *fi) |
358 | { | |
359 | size_t payload = NLMSG_ALIGN(sizeof(struct rtmsg)) | |
360 | + nla_total_size(4) /* RTA_TABLE */ | |
361 | + nla_total_size(4) /* RTA_DST */ | |
362 | + nla_total_size(4) /* RTA_PRIORITY */ | |
ea697639 DB |
363 | + nla_total_size(4) /* RTA_PREFSRC */ |
364 | + nla_total_size(TCP_CA_NAME_MAX); /* RTAX_CC_ALGO */ | |
339bf98f TG |
365 | |
366 | /* space for nested metrics */ | |
367 | payload += nla_total_size((RTAX_MAX * nla_total_size(4))); | |
368 | ||
369 | if (fi->fib_nhs) { | |
370 | /* Also handles the special case fib_nhs == 1 */ | |
371 | ||
372 | /* each nexthop is packed in an attribute */ | |
373 | size_t nhsize = nla_total_size(sizeof(struct rtnexthop)); | |
374 | ||
375 | /* may contain flow and gateway attribute */ | |
376 | nhsize += 2 * nla_total_size(4); | |
377 | ||
378 | /* all nexthops are packed in a nested attribute */ | |
379 | payload += nla_total_size(fi->fib_nhs * nhsize); | |
380 | } | |
381 | ||
382 | return payload; | |
383 | } | |
384 | ||
81f7bf6c | 385 | void rtmsg_fib(int event, __be32 key, struct fib_alias *fa, |
9877b253 | 386 | int dst_len, u32 tb_id, const struct nl_info *info, |
b8f55831 | 387 | unsigned int nlm_flags) |
1da177e4 LT |
388 | { |
389 | struct sk_buff *skb; | |
4e902c57 | 390 | u32 seq = info->nlh ? info->nlh->nlmsg_seq : 0; |
f21c7bc5 | 391 | int err = -ENOBUFS; |
1da177e4 | 392 | |
339bf98f | 393 | skb = nlmsg_new(fib_nlmsg_size(fa->fa_info), GFP_KERNEL); |
f21c7bc5 TG |
394 | if (skb == NULL) |
395 | goto errout; | |
1da177e4 | 396 | |
15e47304 | 397 | err = fib_dump_info(skb, info->portid, seq, event, tb_id, |
37e826c5 | 398 | fa->fa_type, key, dst_len, |
b8f55831 | 399 | fa->fa_tos, fa->fa_info, nlm_flags); |
26932566 PM |
400 | if (err < 0) { |
401 | /* -EMSGSIZE implies BUG in fib_nlmsg_size() */ | |
402 | WARN_ON(err == -EMSGSIZE); | |
403 | kfree_skb(skb); | |
404 | goto errout; | |
405 | } | |
15e47304 | 406 | rtnl_notify(skb, info->nl_net, info->portid, RTNLGRP_IPV4_ROUTE, |
1ce85fe4 PNA |
407 | info->nlh, GFP_KERNEL); |
408 | return; | |
f21c7bc5 TG |
409 | errout: |
410 | if (err < 0) | |
4d1169c1 | 411 | rtnl_set_sk_err(info->nl_net, RTNLGRP_IPV4_ROUTE, err); |
1da177e4 LT |
412 | } |
413 | ||
414 | /* Return the first fib alias matching TOS with | |
415 | * priority less than or equal to PRIO. | |
416 | */ | |
417 | struct fib_alias *fib_find_alias(struct list_head *fah, u8 tos, u32 prio) | |
418 | { | |
419 | if (fah) { | |
420 | struct fib_alias *fa; | |
421 | list_for_each_entry(fa, fah, fa_list) { | |
422 | if (fa->fa_tos > tos) | |
423 | continue; | |
424 | if (fa->fa_info->fib_priority >= prio || | |
425 | fa->fa_tos < tos) | |
426 | return fa; | |
427 | } | |
428 | } | |
429 | return NULL; | |
430 | } | |
431 | ||
c9cb6b6e SH |
432 | static int fib_detect_death(struct fib_info *fi, int order, |
433 | struct fib_info **last_resort, int *last_idx, | |
434 | int dflt) | |
1da177e4 LT |
435 | { |
436 | struct neighbour *n; | |
437 | int state = NUD_NONE; | |
438 | ||
439 | n = neigh_lookup(&arp_tbl, &fi->fib_nh[0].nh_gw, fi->fib_dev); | |
440 | if (n) { | |
441 | state = n->nud_state; | |
442 | neigh_release(n); | |
443 | } | |
d9319100 | 444 | if (state == NUD_REACHABLE) |
1da177e4 | 445 | return 0; |
6a31d2a9 | 446 | if ((state & NUD_VALID) && order != dflt) |
1da177e4 | 447 | return 0; |
6a31d2a9 ED |
448 | if ((state & NUD_VALID) || |
449 | (*last_idx < 0 && order > dflt)) { | |
1da177e4 LT |
450 | *last_resort = fi; |
451 | *last_idx = order; | |
452 | } | |
453 | return 1; | |
454 | } | |
455 | ||
456 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
457 | ||
4e902c57 | 458 | static int fib_count_nexthops(struct rtnexthop *rtnh, int remaining) |
1da177e4 LT |
459 | { |
460 | int nhs = 0; | |
1da177e4 | 461 | |
4e902c57 | 462 | while (rtnh_ok(rtnh, remaining)) { |
1da177e4 | 463 | nhs++; |
4e902c57 TG |
464 | rtnh = rtnh_next(rtnh, &remaining); |
465 | } | |
466 | ||
467 | /* leftover implies invalid nexthop configuration, discard it */ | |
468 | return remaining > 0 ? 0 : nhs; | |
1da177e4 LT |
469 | } |
470 | ||
4e902c57 TG |
471 | static int fib_get_nhs(struct fib_info *fi, struct rtnexthop *rtnh, |
472 | int remaining, struct fib_config *cfg) | |
1da177e4 | 473 | { |
1da177e4 | 474 | change_nexthops(fi) { |
4e902c57 TG |
475 | int attrlen; |
476 | ||
477 | if (!rtnh_ok(rtnh, remaining)) | |
1da177e4 | 478 | return -EINVAL; |
4e902c57 | 479 | |
71fceff0 DM |
480 | nexthop_nh->nh_flags = |
481 | (cfg->fc_flags & ~0xFF) | rtnh->rtnh_flags; | |
482 | nexthop_nh->nh_oif = rtnh->rtnh_ifindex; | |
483 | nexthop_nh->nh_weight = rtnh->rtnh_hops + 1; | |
4e902c57 TG |
484 | |
485 | attrlen = rtnh_attrlen(rtnh); | |
486 | if (attrlen > 0) { | |
487 | struct nlattr *nla, *attrs = rtnh_attrs(rtnh); | |
488 | ||
489 | nla = nla_find(attrs, attrlen, RTA_GATEWAY); | |
71fceff0 | 490 | nexthop_nh->nh_gw = nla ? nla_get_be32(nla) : 0; |
c7066f70 | 491 | #ifdef CONFIG_IP_ROUTE_CLASSID |
4e902c57 | 492 | nla = nla_find(attrs, attrlen, RTA_FLOW); |
71fceff0 | 493 | nexthop_nh->nh_tclassid = nla ? nla_get_u32(nla) : 0; |
7a9bc9b8 | 494 | if (nexthop_nh->nh_tclassid) |
f4530fa5 | 495 | fi->fib_net->ipv4.fib_num_tclassid_users++; |
1da177e4 LT |
496 | #endif |
497 | } | |
4e902c57 TG |
498 | |
499 | rtnh = rtnh_next(rtnh, &remaining); | |
1da177e4 | 500 | } endfor_nexthops(fi); |
4e902c57 | 501 | |
1da177e4 LT |
502 | return 0; |
503 | } | |
504 | ||
505 | #endif | |
506 | ||
4e902c57 | 507 | int fib_nh_match(struct fib_config *cfg, struct fib_info *fi) |
1da177e4 LT |
508 | { |
509 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
4e902c57 TG |
510 | struct rtnexthop *rtnh; |
511 | int remaining; | |
1da177e4 LT |
512 | #endif |
513 | ||
4e902c57 | 514 | if (cfg->fc_priority && cfg->fc_priority != fi->fib_priority) |
1da177e4 LT |
515 | return 1; |
516 | ||
4e902c57 TG |
517 | if (cfg->fc_oif || cfg->fc_gw) { |
518 | if ((!cfg->fc_oif || cfg->fc_oif == fi->fib_nh->nh_oif) && | |
519 | (!cfg->fc_gw || cfg->fc_gw == fi->fib_nh->nh_gw)) | |
1da177e4 LT |
520 | return 0; |
521 | return 1; | |
522 | } | |
523 | ||
524 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
4e902c57 | 525 | if (cfg->fc_mp == NULL) |
1da177e4 | 526 | return 0; |
4e902c57 TG |
527 | |
528 | rtnh = cfg->fc_mp; | |
529 | remaining = cfg->fc_mp_len; | |
e905a9ed | 530 | |
1da177e4 | 531 | for_nexthops(fi) { |
4e902c57 | 532 | int attrlen; |
1da177e4 | 533 | |
4e902c57 | 534 | if (!rtnh_ok(rtnh, remaining)) |
1da177e4 | 535 | return -EINVAL; |
4e902c57 TG |
536 | |
537 | if (rtnh->rtnh_ifindex && rtnh->rtnh_ifindex != nh->nh_oif) | |
1da177e4 | 538 | return 1; |
4e902c57 TG |
539 | |
540 | attrlen = rtnh_attrlen(rtnh); | |
f76936d0 | 541 | if (attrlen > 0) { |
4e902c57 TG |
542 | struct nlattr *nla, *attrs = rtnh_attrs(rtnh); |
543 | ||
544 | nla = nla_find(attrs, attrlen, RTA_GATEWAY); | |
17fb2c64 | 545 | if (nla && nla_get_be32(nla) != nh->nh_gw) |
1da177e4 | 546 | return 1; |
c7066f70 | 547 | #ifdef CONFIG_IP_ROUTE_CLASSID |
4e902c57 TG |
548 | nla = nla_find(attrs, attrlen, RTA_FLOW); |
549 | if (nla && nla_get_u32(nla) != nh->nh_tclassid) | |
1da177e4 LT |
550 | return 1; |
551 | #endif | |
552 | } | |
4e902c57 TG |
553 | |
554 | rtnh = rtnh_next(rtnh, &remaining); | |
1da177e4 LT |
555 | } endfor_nexthops(fi); |
556 | #endif | |
557 | return 0; | |
558 | } | |
559 | ||
560 | ||
561 | /* | |
6a31d2a9 ED |
562 | * Picture |
563 | * ------- | |
564 | * | |
565 | * Semantics of nexthop is very messy by historical reasons. | |
566 | * We have to take into account, that: | |
567 | * a) gateway can be actually local interface address, | |
568 | * so that gatewayed route is direct. | |
569 | * b) gateway must be on-link address, possibly | |
570 | * described not by an ifaddr, but also by a direct route. | |
571 | * c) If both gateway and interface are specified, they should not | |
572 | * contradict. | |
573 | * d) If we use tunnel routes, gateway could be not on-link. | |
574 | * | |
575 | * Attempt to reconcile all of these (alas, self-contradictory) conditions | |
576 | * results in pretty ugly and hairy code with obscure logic. | |
577 | * | |
578 | * I chose to generalized it instead, so that the size | |
579 | * of code does not increase practically, but it becomes | |
580 | * much more general. | |
581 | * Every prefix is assigned a "scope" value: "host" is local address, | |
582 | * "link" is direct route, | |
583 | * [ ... "site" ... "interior" ... ] | |
584 | * and "universe" is true gateway route with global meaning. | |
585 | * | |
586 | * Every prefix refers to a set of "nexthop"s (gw, oif), | |
587 | * where gw must have narrower scope. This recursion stops | |
588 | * when gw has LOCAL scope or if "nexthop" is declared ONLINK, | |
589 | * which means that gw is forced to be on link. | |
590 | * | |
591 | * Code is still hairy, but now it is apparently logically | |
592 | * consistent and very flexible. F.e. as by-product it allows | |
593 | * to co-exists in peace independent exterior and interior | |
594 | * routing processes. | |
595 | * | |
596 | * Normally it looks as following. | |
597 | * | |
598 | * {universe prefix} -> (gw, oif) [scope link] | |
599 | * | | |
600 | * |-> {link prefix} -> (gw, oif) [scope local] | |
601 | * | | |
602 | * |-> {local prefix} (terminal node) | |
1da177e4 | 603 | */ |
4e902c57 TG |
604 | static int fib_check_nh(struct fib_config *cfg, struct fib_info *fi, |
605 | struct fib_nh *nh) | |
1da177e4 LT |
606 | { |
607 | int err; | |
86167a37 | 608 | struct net *net; |
6a31d2a9 | 609 | struct net_device *dev; |
1da177e4 | 610 | |
86167a37 | 611 | net = cfg->fc_nlinfo.nl_net; |
1da177e4 LT |
612 | if (nh->nh_gw) { |
613 | struct fib_result res; | |
614 | ||
6a31d2a9 | 615 | if (nh->nh_flags & RTNH_F_ONLINK) { |
1da177e4 | 616 | |
4e902c57 | 617 | if (cfg->fc_scope >= RT_SCOPE_LINK) |
1da177e4 | 618 | return -EINVAL; |
86167a37 | 619 | if (inet_addr_type(net, nh->nh_gw) != RTN_UNICAST) |
1da177e4 | 620 | return -EINVAL; |
6a31d2a9 ED |
621 | dev = __dev_get_by_index(net, nh->nh_oif); |
622 | if (!dev) | |
1da177e4 | 623 | return -ENODEV; |
6a31d2a9 | 624 | if (!(dev->flags & IFF_UP)) |
1da177e4 LT |
625 | return -ENETDOWN; |
626 | nh->nh_dev = dev; | |
627 | dev_hold(dev); | |
628 | nh->nh_scope = RT_SCOPE_LINK; | |
629 | return 0; | |
630 | } | |
ebc0ffae | 631 | rcu_read_lock(); |
1da177e4 | 632 | { |
9ade2286 DM |
633 | struct flowi4 fl4 = { |
634 | .daddr = nh->nh_gw, | |
635 | .flowi4_scope = cfg->fc_scope + 1, | |
636 | .flowi4_oif = nh->nh_oif, | |
6a662719 | 637 | .flowi4_iif = LOOPBACK_IFINDEX, |
4e902c57 | 638 | }; |
1da177e4 LT |
639 | |
640 | /* It is not necessary, but requires a bit of thinking */ | |
9ade2286 DM |
641 | if (fl4.flowi4_scope < RT_SCOPE_LINK) |
642 | fl4.flowi4_scope = RT_SCOPE_LINK; | |
643 | err = fib_lookup(net, &fl4, &res); | |
ebc0ffae ED |
644 | if (err) { |
645 | rcu_read_unlock(); | |
1da177e4 | 646 | return err; |
ebc0ffae | 647 | } |
1da177e4 LT |
648 | } |
649 | err = -EINVAL; | |
650 | if (res.type != RTN_UNICAST && res.type != RTN_LOCAL) | |
651 | goto out; | |
652 | nh->nh_scope = res.scope; | |
653 | nh->nh_oif = FIB_RES_OIF(res); | |
6a31d2a9 ED |
654 | nh->nh_dev = dev = FIB_RES_DEV(res); |
655 | if (!dev) | |
1da177e4 | 656 | goto out; |
6a31d2a9 | 657 | dev_hold(dev); |
8723e1b4 | 658 | err = (dev->flags & IFF_UP) ? 0 : -ENETDOWN; |
1da177e4 LT |
659 | } else { |
660 | struct in_device *in_dev; | |
661 | ||
6a31d2a9 | 662 | if (nh->nh_flags & (RTNH_F_PERVASIVE | RTNH_F_ONLINK)) |
1da177e4 LT |
663 | return -EINVAL; |
664 | ||
8723e1b4 ED |
665 | rcu_read_lock(); |
666 | err = -ENODEV; | |
86167a37 | 667 | in_dev = inetdev_by_index(net, nh->nh_oif); |
1da177e4 | 668 | if (in_dev == NULL) |
8723e1b4 ED |
669 | goto out; |
670 | err = -ENETDOWN; | |
671 | if (!(in_dev->dev->flags & IFF_UP)) | |
672 | goto out; | |
1da177e4 LT |
673 | nh->nh_dev = in_dev->dev; |
674 | dev_hold(nh->nh_dev); | |
675 | nh->nh_scope = RT_SCOPE_HOST; | |
8723e1b4 | 676 | err = 0; |
1da177e4 | 677 | } |
8723e1b4 ED |
678 | out: |
679 | rcu_read_unlock(); | |
680 | return err; | |
1da177e4 LT |
681 | } |
682 | ||
81f7bf6c | 683 | static inline unsigned int fib_laddr_hashfn(__be32 val) |
1da177e4 | 684 | { |
123b9731 | 685 | unsigned int mask = (fib_info_hash_size - 1); |
1da177e4 | 686 | |
6a31d2a9 ED |
687 | return ((__force u32)val ^ |
688 | ((__force u32)val >> 7) ^ | |
689 | ((__force u32)val >> 14)) & mask; | |
1da177e4 LT |
690 | } |
691 | ||
123b9731 | 692 | static struct hlist_head *fib_info_hash_alloc(int bytes) |
1da177e4 LT |
693 | { |
694 | if (bytes <= PAGE_SIZE) | |
88f83491 | 695 | return kzalloc(bytes, GFP_KERNEL); |
1da177e4 LT |
696 | else |
697 | return (struct hlist_head *) | |
6a31d2a9 ED |
698 | __get_free_pages(GFP_KERNEL | __GFP_ZERO, |
699 | get_order(bytes)); | |
1da177e4 LT |
700 | } |
701 | ||
123b9731 | 702 | static void fib_info_hash_free(struct hlist_head *hash, int bytes) |
1da177e4 LT |
703 | { |
704 | if (!hash) | |
705 | return; | |
706 | ||
707 | if (bytes <= PAGE_SIZE) | |
708 | kfree(hash); | |
709 | else | |
710 | free_pages((unsigned long) hash, get_order(bytes)); | |
711 | } | |
712 | ||
123b9731 DM |
713 | static void fib_info_hash_move(struct hlist_head *new_info_hash, |
714 | struct hlist_head *new_laddrhash, | |
715 | unsigned int new_size) | |
1da177e4 | 716 | { |
b7656e7f | 717 | struct hlist_head *old_info_hash, *old_laddrhash; |
123b9731 | 718 | unsigned int old_size = fib_info_hash_size; |
b7656e7f | 719 | unsigned int i, bytes; |
1da177e4 | 720 | |
832b4c5e | 721 | spin_lock_bh(&fib_info_lock); |
b7656e7f DM |
722 | old_info_hash = fib_info_hash; |
723 | old_laddrhash = fib_info_laddrhash; | |
123b9731 | 724 | fib_info_hash_size = new_size; |
1da177e4 LT |
725 | |
726 | for (i = 0; i < old_size; i++) { | |
727 | struct hlist_head *head = &fib_info_hash[i]; | |
b67bfe0d | 728 | struct hlist_node *n; |
1da177e4 LT |
729 | struct fib_info *fi; |
730 | ||
b67bfe0d | 731 | hlist_for_each_entry_safe(fi, n, head, fib_hash) { |
1da177e4 LT |
732 | struct hlist_head *dest; |
733 | unsigned int new_hash; | |
734 | ||
735 | hlist_del(&fi->fib_hash); | |
736 | ||
737 | new_hash = fib_info_hashfn(fi); | |
738 | dest = &new_info_hash[new_hash]; | |
739 | hlist_add_head(&fi->fib_hash, dest); | |
740 | } | |
741 | } | |
742 | fib_info_hash = new_info_hash; | |
743 | ||
744 | for (i = 0; i < old_size; i++) { | |
745 | struct hlist_head *lhead = &fib_info_laddrhash[i]; | |
b67bfe0d | 746 | struct hlist_node *n; |
1da177e4 LT |
747 | struct fib_info *fi; |
748 | ||
b67bfe0d | 749 | hlist_for_each_entry_safe(fi, n, lhead, fib_lhash) { |
1da177e4 LT |
750 | struct hlist_head *ldest; |
751 | unsigned int new_hash; | |
752 | ||
753 | hlist_del(&fi->fib_lhash); | |
754 | ||
755 | new_hash = fib_laddr_hashfn(fi->fib_prefsrc); | |
756 | ldest = &new_laddrhash[new_hash]; | |
757 | hlist_add_head(&fi->fib_lhash, ldest); | |
758 | } | |
759 | } | |
760 | fib_info_laddrhash = new_laddrhash; | |
761 | ||
832b4c5e | 762 | spin_unlock_bh(&fib_info_lock); |
b7656e7f DM |
763 | |
764 | bytes = old_size * sizeof(struct hlist_head *); | |
123b9731 DM |
765 | fib_info_hash_free(old_info_hash, bytes); |
766 | fib_info_hash_free(old_laddrhash, bytes); | |
1da177e4 LT |
767 | } |
768 | ||
436c3b66 DM |
769 | __be32 fib_info_update_nh_saddr(struct net *net, struct fib_nh *nh) |
770 | { | |
771 | nh->nh_saddr = inet_select_addr(nh->nh_dev, | |
772 | nh->nh_gw, | |
37e826c5 | 773 | nh->nh_parent->fib_scope); |
436c3b66 DM |
774 | nh->nh_saddr_genid = atomic_read(&net->ipv4.dev_addr_genid); |
775 | ||
776 | return nh->nh_saddr; | |
777 | } | |
778 | ||
4e902c57 | 779 | struct fib_info *fib_create_info(struct fib_config *cfg) |
1da177e4 LT |
780 | { |
781 | int err; | |
782 | struct fib_info *fi = NULL; | |
783 | struct fib_info *ofi; | |
1da177e4 | 784 | int nhs = 1; |
7462bd74 | 785 | struct net *net = cfg->fc_nlinfo.nl_net; |
1da177e4 | 786 | |
4c8237cd DM |
787 | if (cfg->fc_type > RTN_MAX) |
788 | goto err_inval; | |
789 | ||
1da177e4 | 790 | /* Fast check to catch the most weird cases */ |
4e902c57 | 791 | if (fib_props[cfg->fc_type].scope > cfg->fc_scope) |
1da177e4 LT |
792 | goto err_inval; |
793 | ||
794 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
4e902c57 TG |
795 | if (cfg->fc_mp) { |
796 | nhs = fib_count_nexthops(cfg->fc_mp, cfg->fc_mp_len); | |
1da177e4 LT |
797 | if (nhs == 0) |
798 | goto err_inval; | |
799 | } | |
800 | #endif | |
1da177e4 LT |
801 | |
802 | err = -ENOBUFS; | |
123b9731 DM |
803 | if (fib_info_cnt >= fib_info_hash_size) { |
804 | unsigned int new_size = fib_info_hash_size << 1; | |
1da177e4 LT |
805 | struct hlist_head *new_info_hash; |
806 | struct hlist_head *new_laddrhash; | |
807 | unsigned int bytes; | |
808 | ||
809 | if (!new_size) | |
d94ce9b2 | 810 | new_size = 16; |
1da177e4 | 811 | bytes = new_size * sizeof(struct hlist_head *); |
123b9731 DM |
812 | new_info_hash = fib_info_hash_alloc(bytes); |
813 | new_laddrhash = fib_info_hash_alloc(bytes); | |
1da177e4 | 814 | if (!new_info_hash || !new_laddrhash) { |
123b9731 DM |
815 | fib_info_hash_free(new_info_hash, bytes); |
816 | fib_info_hash_free(new_laddrhash, bytes); | |
88f83491 | 817 | } else |
123b9731 | 818 | fib_info_hash_move(new_info_hash, new_laddrhash, new_size); |
1da177e4 | 819 | |
123b9731 | 820 | if (!fib_info_hash_size) |
1da177e4 LT |
821 | goto failure; |
822 | } | |
823 | ||
0da974f4 | 824 | fi = kzalloc(sizeof(*fi)+nhs*sizeof(struct fib_nh), GFP_KERNEL); |
1da177e4 LT |
825 | if (fi == NULL) |
826 | goto failure; | |
aeefa1ec | 827 | fib_info_cnt++; |
725d1e1b DM |
828 | if (cfg->fc_mx) { |
829 | fi->fib_metrics = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL); | |
830 | if (!fi->fib_metrics) | |
831 | goto failure; | |
832 | } else | |
833 | fi->fib_metrics = (u32 *) dst_default_metrics; | |
1da177e4 | 834 | |
57d7a600 | 835 | fi->fib_net = hold_net(net); |
4e902c57 | 836 | fi->fib_protocol = cfg->fc_protocol; |
37e826c5 | 837 | fi->fib_scope = cfg->fc_scope; |
4e902c57 TG |
838 | fi->fib_flags = cfg->fc_flags; |
839 | fi->fib_priority = cfg->fc_priority; | |
840 | fi->fib_prefsrc = cfg->fc_prefsrc; | |
f4ef85bb | 841 | fi->fib_type = cfg->fc_type; |
1da177e4 LT |
842 | |
843 | fi->fib_nhs = nhs; | |
844 | change_nexthops(fi) { | |
71fceff0 | 845 | nexthop_nh->nh_parent = fi; |
d26b3a7c | 846 | nexthop_nh->nh_pcpu_rth_output = alloc_percpu(struct rtable __rcu *); |
f8a17175 JA |
847 | if (!nexthop_nh->nh_pcpu_rth_output) |
848 | goto failure; | |
1da177e4 LT |
849 | } endfor_nexthops(fi) |
850 | ||
4e902c57 TG |
851 | if (cfg->fc_mx) { |
852 | struct nlattr *nla; | |
853 | int remaining; | |
854 | ||
855 | nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) { | |
8f4c1f9b | 856 | int type = nla_type(nla); |
4e902c57 TG |
857 | |
858 | if (type) { | |
6fac2625 DM |
859 | u32 val; |
860 | ||
4e902c57 | 861 | if (type > RTAX_MAX) |
1da177e4 | 862 | goto err_inval; |
ea697639 DB |
863 | if (type == RTAX_CC_ALGO) { |
864 | char tmp[TCP_CA_NAME_MAX]; | |
865 | ||
866 | nla_strlcpy(tmp, nla, sizeof(tmp)); | |
867 | val = tcp_ca_get_key_by_name(tmp); | |
868 | if (val == TCP_CA_UNSPEC) | |
869 | goto err_inval; | |
870 | } else { | |
871 | val = nla_get_u32(nla); | |
872 | } | |
6fac2625 DM |
873 | if (type == RTAX_ADVMSS && val > 65535 - 40) |
874 | val = 65535 - 40; | |
710ab6c0 DM |
875 | if (type == RTAX_MTU && val > 65535 - 15) |
876 | val = 65535 - 15; | |
6fac2625 | 877 | fi->fib_metrics[type - 1] = val; |
1da177e4 | 878 | } |
1da177e4 LT |
879 | } |
880 | } | |
1da177e4 | 881 | |
4e902c57 | 882 | if (cfg->fc_mp) { |
1da177e4 | 883 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
4e902c57 TG |
884 | err = fib_get_nhs(fi, cfg->fc_mp, cfg->fc_mp_len, cfg); |
885 | if (err != 0) | |
1da177e4 | 886 | goto failure; |
4e902c57 | 887 | if (cfg->fc_oif && fi->fib_nh->nh_oif != cfg->fc_oif) |
1da177e4 | 888 | goto err_inval; |
4e902c57 | 889 | if (cfg->fc_gw && fi->fib_nh->nh_gw != cfg->fc_gw) |
1da177e4 | 890 | goto err_inval; |
c7066f70 | 891 | #ifdef CONFIG_IP_ROUTE_CLASSID |
4e902c57 | 892 | if (cfg->fc_flow && fi->fib_nh->nh_tclassid != cfg->fc_flow) |
1da177e4 LT |
893 | goto err_inval; |
894 | #endif | |
895 | #else | |
896 | goto err_inval; | |
897 | #endif | |
898 | } else { | |
899 | struct fib_nh *nh = fi->fib_nh; | |
4e902c57 TG |
900 | |
901 | nh->nh_oif = cfg->fc_oif; | |
902 | nh->nh_gw = cfg->fc_gw; | |
903 | nh->nh_flags = cfg->fc_flags; | |
c7066f70 | 904 | #ifdef CONFIG_IP_ROUTE_CLASSID |
4e902c57 | 905 | nh->nh_tclassid = cfg->fc_flow; |
7a9bc9b8 | 906 | if (nh->nh_tclassid) |
f4530fa5 | 907 | fi->fib_net->ipv4.fib_num_tclassid_users++; |
1da177e4 | 908 | #endif |
1da177e4 LT |
909 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
910 | nh->nh_weight = 1; | |
911 | #endif | |
912 | } | |
913 | ||
4e902c57 TG |
914 | if (fib_props[cfg->fc_type].error) { |
915 | if (cfg->fc_gw || cfg->fc_oif || cfg->fc_mp) | |
1da177e4 LT |
916 | goto err_inval; |
917 | goto link_it; | |
4c8237cd DM |
918 | } else { |
919 | switch (cfg->fc_type) { | |
920 | case RTN_UNICAST: | |
921 | case RTN_LOCAL: | |
922 | case RTN_BROADCAST: | |
923 | case RTN_ANYCAST: | |
924 | case RTN_MULTICAST: | |
925 | break; | |
926 | default: | |
927 | goto err_inval; | |
928 | } | |
1da177e4 LT |
929 | } |
930 | ||
4e902c57 | 931 | if (cfg->fc_scope > RT_SCOPE_HOST) |
1da177e4 LT |
932 | goto err_inval; |
933 | ||
4e902c57 | 934 | if (cfg->fc_scope == RT_SCOPE_HOST) { |
1da177e4 LT |
935 | struct fib_nh *nh = fi->fib_nh; |
936 | ||
937 | /* Local address is added. */ | |
938 | if (nhs != 1 || nh->nh_gw) | |
939 | goto err_inval; | |
940 | nh->nh_scope = RT_SCOPE_NOWHERE; | |
7462bd74 | 941 | nh->nh_dev = dev_get_by_index(net, fi->fib_nh->nh_oif); |
1da177e4 LT |
942 | err = -ENODEV; |
943 | if (nh->nh_dev == NULL) | |
944 | goto failure; | |
945 | } else { | |
946 | change_nexthops(fi) { | |
6a31d2a9 ED |
947 | err = fib_check_nh(cfg, fi, nexthop_nh); |
948 | if (err != 0) | |
1da177e4 LT |
949 | goto failure; |
950 | } endfor_nexthops(fi) | |
951 | } | |
952 | ||
953 | if (fi->fib_prefsrc) { | |
4e902c57 TG |
954 | if (cfg->fc_type != RTN_LOCAL || !cfg->fc_dst || |
955 | fi->fib_prefsrc != cfg->fc_dst) | |
7462bd74 | 956 | if (inet_addr_type(net, fi->fib_prefsrc) != RTN_LOCAL) |
1da177e4 LT |
957 | goto err_inval; |
958 | } | |
959 | ||
1fc050a1 | 960 | change_nexthops(fi) { |
436c3b66 | 961 | fib_info_update_nh_saddr(net, nexthop_nh); |
1fc050a1 DM |
962 | } endfor_nexthops(fi) |
963 | ||
1da177e4 | 964 | link_it: |
6a31d2a9 ED |
965 | ofi = fib_find_info(fi); |
966 | if (ofi) { | |
1da177e4 LT |
967 | fi->fib_dead = 1; |
968 | free_fib_info(fi); | |
969 | ofi->fib_treeref++; | |
970 | return ofi; | |
971 | } | |
972 | ||
973 | fi->fib_treeref++; | |
974 | atomic_inc(&fi->fib_clntref); | |
832b4c5e | 975 | spin_lock_bh(&fib_info_lock); |
1da177e4 LT |
976 | hlist_add_head(&fi->fib_hash, |
977 | &fib_info_hash[fib_info_hashfn(fi)]); | |
978 | if (fi->fib_prefsrc) { | |
979 | struct hlist_head *head; | |
980 | ||
981 | head = &fib_info_laddrhash[fib_laddr_hashfn(fi->fib_prefsrc)]; | |
982 | hlist_add_head(&fi->fib_lhash, head); | |
983 | } | |
984 | change_nexthops(fi) { | |
985 | struct hlist_head *head; | |
986 | unsigned int hash; | |
987 | ||
71fceff0 | 988 | if (!nexthop_nh->nh_dev) |
1da177e4 | 989 | continue; |
71fceff0 | 990 | hash = fib_devindex_hashfn(nexthop_nh->nh_dev->ifindex); |
1da177e4 | 991 | head = &fib_info_devhash[hash]; |
71fceff0 | 992 | hlist_add_head(&nexthop_nh->nh_hash, head); |
1da177e4 | 993 | } endfor_nexthops(fi) |
832b4c5e | 994 | spin_unlock_bh(&fib_info_lock); |
1da177e4 LT |
995 | return fi; |
996 | ||
997 | err_inval: | |
998 | err = -EINVAL; | |
999 | ||
1000 | failure: | |
e905a9ed | 1001 | if (fi) { |
1da177e4 LT |
1002 | fi->fib_dead = 1; |
1003 | free_fib_info(fi); | |
1004 | } | |
4e902c57 TG |
1005 | |
1006 | return ERR_PTR(err); | |
1da177e4 LT |
1007 | } |
1008 | ||
15e47304 | 1009 | int fib_dump_info(struct sk_buff *skb, u32 portid, u32 seq, int event, |
37e826c5 | 1010 | u32 tb_id, u8 type, __be32 dst, int dst_len, u8 tos, |
be403ea1 | 1011 | struct fib_info *fi, unsigned int flags) |
1da177e4 | 1012 | { |
be403ea1 | 1013 | struct nlmsghdr *nlh; |
1da177e4 | 1014 | struct rtmsg *rtm; |
1da177e4 | 1015 | |
15e47304 | 1016 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*rtm), flags); |
be403ea1 | 1017 | if (nlh == NULL) |
26932566 | 1018 | return -EMSGSIZE; |
be403ea1 TG |
1019 | |
1020 | rtm = nlmsg_data(nlh); | |
1da177e4 LT |
1021 | rtm->rtm_family = AF_INET; |
1022 | rtm->rtm_dst_len = dst_len; | |
1023 | rtm->rtm_src_len = 0; | |
1024 | rtm->rtm_tos = tos; | |
709772e6 KPO |
1025 | if (tb_id < 256) |
1026 | rtm->rtm_table = tb_id; | |
1027 | else | |
1028 | rtm->rtm_table = RT_TABLE_COMPAT; | |
f3756b79 DM |
1029 | if (nla_put_u32(skb, RTA_TABLE, tb_id)) |
1030 | goto nla_put_failure; | |
1da177e4 LT |
1031 | rtm->rtm_type = type; |
1032 | rtm->rtm_flags = fi->fib_flags; | |
37e826c5 | 1033 | rtm->rtm_scope = fi->fib_scope; |
1da177e4 | 1034 | rtm->rtm_protocol = fi->fib_protocol; |
be403ea1 | 1035 | |
f3756b79 DM |
1036 | if (rtm->rtm_dst_len && |
1037 | nla_put_be32(skb, RTA_DST, dst)) | |
1038 | goto nla_put_failure; | |
1039 | if (fi->fib_priority && | |
1040 | nla_put_u32(skb, RTA_PRIORITY, fi->fib_priority)) | |
1041 | goto nla_put_failure; | |
1da177e4 | 1042 | if (rtnetlink_put_metrics(skb, fi->fib_metrics) < 0) |
be403ea1 TG |
1043 | goto nla_put_failure; |
1044 | ||
f3756b79 DM |
1045 | if (fi->fib_prefsrc && |
1046 | nla_put_be32(skb, RTA_PREFSRC, fi->fib_prefsrc)) | |
1047 | goto nla_put_failure; | |
1da177e4 | 1048 | if (fi->fib_nhs == 1) { |
f3756b79 DM |
1049 | if (fi->fib_nh->nh_gw && |
1050 | nla_put_be32(skb, RTA_GATEWAY, fi->fib_nh->nh_gw)) | |
1051 | goto nla_put_failure; | |
1052 | if (fi->fib_nh->nh_oif && | |
1053 | nla_put_u32(skb, RTA_OIF, fi->fib_nh->nh_oif)) | |
1054 | goto nla_put_failure; | |
c7066f70 | 1055 | #ifdef CONFIG_IP_ROUTE_CLASSID |
f3756b79 DM |
1056 | if (fi->fib_nh[0].nh_tclassid && |
1057 | nla_put_u32(skb, RTA_FLOW, fi->fib_nh[0].nh_tclassid)) | |
1058 | goto nla_put_failure; | |
8265abc0 | 1059 | #endif |
1da177e4 LT |
1060 | } |
1061 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
1062 | if (fi->fib_nhs > 1) { | |
be403ea1 TG |
1063 | struct rtnexthop *rtnh; |
1064 | struct nlattr *mp; | |
1065 | ||
1066 | mp = nla_nest_start(skb, RTA_MULTIPATH); | |
1067 | if (mp == NULL) | |
1068 | goto nla_put_failure; | |
1da177e4 LT |
1069 | |
1070 | for_nexthops(fi) { | |
be403ea1 TG |
1071 | rtnh = nla_reserve_nohdr(skb, sizeof(*rtnh)); |
1072 | if (rtnh == NULL) | |
1073 | goto nla_put_failure; | |
1074 | ||
1075 | rtnh->rtnh_flags = nh->nh_flags & 0xFF; | |
1076 | rtnh->rtnh_hops = nh->nh_weight - 1; | |
1077 | rtnh->rtnh_ifindex = nh->nh_oif; | |
1078 | ||
f3756b79 DM |
1079 | if (nh->nh_gw && |
1080 | nla_put_be32(skb, RTA_GATEWAY, nh->nh_gw)) | |
1081 | goto nla_put_failure; | |
c7066f70 | 1082 | #ifdef CONFIG_IP_ROUTE_CLASSID |
f3756b79 DM |
1083 | if (nh->nh_tclassid && |
1084 | nla_put_u32(skb, RTA_FLOW, nh->nh_tclassid)) | |
1085 | goto nla_put_failure; | |
8265abc0 | 1086 | #endif |
be403ea1 TG |
1087 | /* length of rtnetlink header + attributes */ |
1088 | rtnh->rtnh_len = nlmsg_get_pos(skb) - (void *) rtnh; | |
1da177e4 | 1089 | } endfor_nexthops(fi); |
be403ea1 TG |
1090 | |
1091 | nla_nest_end(skb, mp); | |
1da177e4 LT |
1092 | } |
1093 | #endif | |
053c095a JB |
1094 | nlmsg_end(skb, nlh); |
1095 | return 0; | |
1da177e4 | 1096 | |
be403ea1 | 1097 | nla_put_failure: |
26932566 PM |
1098 | nlmsg_cancel(skb, nlh); |
1099 | return -EMSGSIZE; | |
1da177e4 LT |
1100 | } |
1101 | ||
1da177e4 | 1102 | /* |
6a31d2a9 ED |
1103 | * Update FIB if: |
1104 | * - local address disappeared -> we must delete all the entries | |
1105 | * referring to it. | |
1106 | * - device went down -> we must shutdown all nexthops going via it. | |
1da177e4 | 1107 | */ |
4814bdbd | 1108 | int fib_sync_down_addr(struct net *net, __be32 local) |
1da177e4 LT |
1109 | { |
1110 | int ret = 0; | |
85326fa5 DL |
1111 | unsigned int hash = fib_laddr_hashfn(local); |
1112 | struct hlist_head *head = &fib_info_laddrhash[hash]; | |
85326fa5 | 1113 | struct fib_info *fi; |
1da177e4 | 1114 | |
85326fa5 DL |
1115 | if (fib_info_laddrhash == NULL || local == 0) |
1116 | return 0; | |
1da177e4 | 1117 | |
b67bfe0d | 1118 | hlist_for_each_entry(fi, head, fib_lhash) { |
09ad9bc7 | 1119 | if (!net_eq(fi->fib_net, net)) |
4814bdbd | 1120 | continue; |
85326fa5 DL |
1121 | if (fi->fib_prefsrc == local) { |
1122 | fi->fib_flags |= RTNH_F_DEAD; | |
1123 | ret++; | |
1da177e4 LT |
1124 | } |
1125 | } | |
85326fa5 DL |
1126 | return ret; |
1127 | } | |
1128 | ||
1129 | int fib_sync_down_dev(struct net_device *dev, int force) | |
1130 | { | |
1131 | int ret = 0; | |
1132 | int scope = RT_SCOPE_NOWHERE; | |
1133 | struct fib_info *prev_fi = NULL; | |
1134 | unsigned int hash = fib_devindex_hashfn(dev->ifindex); | |
1135 | struct hlist_head *head = &fib_info_devhash[hash]; | |
85326fa5 | 1136 | struct fib_nh *nh; |
1da177e4 | 1137 | |
85326fa5 DL |
1138 | if (force) |
1139 | scope = -1; | |
1da177e4 | 1140 | |
b67bfe0d | 1141 | hlist_for_each_entry(nh, head, nh_hash) { |
85326fa5 DL |
1142 | struct fib_info *fi = nh->nh_parent; |
1143 | int dead; | |
1da177e4 | 1144 | |
85326fa5 DL |
1145 | BUG_ON(!fi->fib_nhs); |
1146 | if (nh->nh_dev != dev || fi == prev_fi) | |
1147 | continue; | |
1148 | prev_fi = fi; | |
1149 | dead = 0; | |
1150 | change_nexthops(fi) { | |
6a31d2a9 | 1151 | if (nexthop_nh->nh_flags & RTNH_F_DEAD) |
85326fa5 | 1152 | dead++; |
71fceff0 DM |
1153 | else if (nexthop_nh->nh_dev == dev && |
1154 | nexthop_nh->nh_scope != scope) { | |
1155 | nexthop_nh->nh_flags |= RTNH_F_DEAD; | |
1da177e4 | 1156 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
85326fa5 | 1157 | spin_lock_bh(&fib_multipath_lock); |
71fceff0 DM |
1158 | fi->fib_power -= nexthop_nh->nh_power; |
1159 | nexthop_nh->nh_power = 0; | |
85326fa5 | 1160 | spin_unlock_bh(&fib_multipath_lock); |
1da177e4 | 1161 | #endif |
85326fa5 DL |
1162 | dead++; |
1163 | } | |
1da177e4 | 1164 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
71fceff0 | 1165 | if (force > 1 && nexthop_nh->nh_dev == dev) { |
85326fa5 DL |
1166 | dead = fi->fib_nhs; |
1167 | break; | |
1da177e4 | 1168 | } |
85326fa5 DL |
1169 | #endif |
1170 | } endfor_nexthops(fi) | |
1171 | if (dead == fi->fib_nhs) { | |
1172 | fi->fib_flags |= RTNH_F_DEAD; | |
1173 | ret++; | |
1da177e4 LT |
1174 | } |
1175 | } | |
1176 | ||
1177 | return ret; | |
1178 | } | |
1179 | ||
0c838ff1 DM |
1180 | /* Must be invoked inside of an RCU protected region. */ |
1181 | void fib_select_default(struct fib_result *res) | |
1182 | { | |
1183 | struct fib_info *fi = NULL, *last_resort = NULL; | |
1184 | struct list_head *fa_head = res->fa_head; | |
1185 | struct fib_table *tb = res->table; | |
1186 | int order = -1, last_idx = -1; | |
1187 | struct fib_alias *fa; | |
1188 | ||
1189 | list_for_each_entry_rcu(fa, fa_head, fa_list) { | |
1190 | struct fib_info *next_fi = fa->fa_info; | |
1191 | ||
37e826c5 | 1192 | if (next_fi->fib_scope != res->scope || |
0c838ff1 DM |
1193 | fa->fa_type != RTN_UNICAST) |
1194 | continue; | |
1195 | ||
1196 | if (next_fi->fib_priority > res->fi->fib_priority) | |
1197 | break; | |
1198 | if (!next_fi->fib_nh[0].nh_gw || | |
1199 | next_fi->fib_nh[0].nh_scope != RT_SCOPE_LINK) | |
1200 | continue; | |
1201 | ||
1202 | fib_alias_accessed(fa); | |
1203 | ||
1204 | if (fi == NULL) { | |
1205 | if (next_fi != res->fi) | |
1206 | break; | |
1207 | } else if (!fib_detect_death(fi, order, &last_resort, | |
1208 | &last_idx, tb->tb_default)) { | |
1209 | fib_result_assign(res, fi); | |
1210 | tb->tb_default = order; | |
1211 | goto out; | |
1212 | } | |
1213 | fi = next_fi; | |
1214 | order++; | |
1215 | } | |
1216 | ||
1217 | if (order <= 0 || fi == NULL) { | |
1218 | tb->tb_default = -1; | |
1219 | goto out; | |
1220 | } | |
1221 | ||
1222 | if (!fib_detect_death(fi, order, &last_resort, &last_idx, | |
1223 | tb->tb_default)) { | |
1224 | fib_result_assign(res, fi); | |
1225 | tb->tb_default = order; | |
1226 | goto out; | |
1227 | } | |
1228 | ||
1229 | if (last_idx >= 0) | |
1230 | fib_result_assign(res, last_resort); | |
1231 | tb->tb_default = last_idx; | |
1232 | out: | |
31d40937 | 1233 | return; |
0c838ff1 DM |
1234 | } |
1235 | ||
1da177e4 LT |
1236 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
1237 | ||
1238 | /* | |
6a31d2a9 ED |
1239 | * Dead device goes up. We wake up dead nexthops. |
1240 | * It takes sense only on multipath routes. | |
1da177e4 | 1241 | */ |
1da177e4 LT |
1242 | int fib_sync_up(struct net_device *dev) |
1243 | { | |
1244 | struct fib_info *prev_fi; | |
1245 | unsigned int hash; | |
1246 | struct hlist_head *head; | |
1da177e4 LT |
1247 | struct fib_nh *nh; |
1248 | int ret; | |
1249 | ||
6a31d2a9 | 1250 | if (!(dev->flags & IFF_UP)) |
1da177e4 LT |
1251 | return 0; |
1252 | ||
1253 | prev_fi = NULL; | |
1254 | hash = fib_devindex_hashfn(dev->ifindex); | |
1255 | head = &fib_info_devhash[hash]; | |
1256 | ret = 0; | |
1257 | ||
b67bfe0d | 1258 | hlist_for_each_entry(nh, head, nh_hash) { |
1da177e4 LT |
1259 | struct fib_info *fi = nh->nh_parent; |
1260 | int alive; | |
1261 | ||
1262 | BUG_ON(!fi->fib_nhs); | |
1263 | if (nh->nh_dev != dev || fi == prev_fi) | |
1264 | continue; | |
1265 | ||
1266 | prev_fi = fi; | |
1267 | alive = 0; | |
1268 | change_nexthops(fi) { | |
6a31d2a9 | 1269 | if (!(nexthop_nh->nh_flags & RTNH_F_DEAD)) { |
1da177e4 LT |
1270 | alive++; |
1271 | continue; | |
1272 | } | |
71fceff0 | 1273 | if (nexthop_nh->nh_dev == NULL || |
6a31d2a9 | 1274 | !(nexthop_nh->nh_dev->flags & IFF_UP)) |
1da177e4 | 1275 | continue; |
71fceff0 DM |
1276 | if (nexthop_nh->nh_dev != dev || |
1277 | !__in_dev_get_rtnl(dev)) | |
1da177e4 LT |
1278 | continue; |
1279 | alive++; | |
1280 | spin_lock_bh(&fib_multipath_lock); | |
71fceff0 DM |
1281 | nexthop_nh->nh_power = 0; |
1282 | nexthop_nh->nh_flags &= ~RTNH_F_DEAD; | |
1da177e4 LT |
1283 | spin_unlock_bh(&fib_multipath_lock); |
1284 | } endfor_nexthops(fi) | |
1285 | ||
1286 | if (alive > 0) { | |
1287 | fi->fib_flags &= ~RTNH_F_DEAD; | |
1288 | ret++; | |
1289 | } | |
1290 | } | |
1291 | ||
1292 | return ret; | |
1293 | } | |
1294 | ||
1295 | /* | |
6a31d2a9 ED |
1296 | * The algorithm is suboptimal, but it provides really |
1297 | * fair weighted route distribution. | |
1da177e4 | 1298 | */ |
1b7fe593 | 1299 | void fib_select_multipath(struct fib_result *res) |
1da177e4 LT |
1300 | { |
1301 | struct fib_info *fi = res->fi; | |
1302 | int w; | |
1303 | ||
1304 | spin_lock_bh(&fib_multipath_lock); | |
1305 | if (fi->fib_power <= 0) { | |
1306 | int power = 0; | |
1307 | change_nexthops(fi) { | |
6a31d2a9 | 1308 | if (!(nexthop_nh->nh_flags & RTNH_F_DEAD)) { |
71fceff0 DM |
1309 | power += nexthop_nh->nh_weight; |
1310 | nexthop_nh->nh_power = nexthop_nh->nh_weight; | |
1da177e4 LT |
1311 | } |
1312 | } endfor_nexthops(fi); | |
1313 | fi->fib_power = power; | |
1314 | if (power <= 0) { | |
1315 | spin_unlock_bh(&fib_multipath_lock); | |
1316 | /* Race condition: route has just become dead. */ | |
1317 | res->nh_sel = 0; | |
1318 | return; | |
1319 | } | |
1320 | } | |
1321 | ||
1322 | ||
1323 | /* w should be random number [0..fi->fib_power-1], | |
6a31d2a9 | 1324 | * it is pretty bad approximation. |
1da177e4 LT |
1325 | */ |
1326 | ||
1327 | w = jiffies % fi->fib_power; | |
1328 | ||
1329 | change_nexthops(fi) { | |
6a31d2a9 | 1330 | if (!(nexthop_nh->nh_flags & RTNH_F_DEAD) && |
71fceff0 | 1331 | nexthop_nh->nh_power) { |
6a31d2a9 ED |
1332 | w -= nexthop_nh->nh_power; |
1333 | if (w <= 0) { | |
71fceff0 | 1334 | nexthop_nh->nh_power--; |
1da177e4 LT |
1335 | fi->fib_power--; |
1336 | res->nh_sel = nhsel; | |
1337 | spin_unlock_bh(&fib_multipath_lock); | |
1338 | return; | |
1339 | } | |
1340 | } | |
1341 | } endfor_nexthops(fi); | |
1342 | ||
1343 | /* Race condition: route has just become dead. */ | |
1344 | res->nh_sel = 0; | |
1345 | spin_unlock_bh(&fib_multipath_lock); | |
1346 | } | |
1347 | #endif |