Commit | Line | Data |
---|---|---|
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> |
571e7226 | 45 | #include <net/lwtunnel.h> |
1da177e4 LT |
46 | |
47 | #include "fib_lookup.h" | |
48 | ||
832b4c5e | 49 | static DEFINE_SPINLOCK(fib_info_lock); |
1da177e4 LT |
50 | static struct hlist_head *fib_info_hash; |
51 | static struct hlist_head *fib_info_laddrhash; | |
123b9731 | 52 | static unsigned int fib_info_hash_size; |
1da177e4 LT |
53 | static unsigned int fib_info_cnt; |
54 | ||
55 | #define DEVINDEX_HASHBITS 8 | |
56 | #define DEVINDEX_HASHSIZE (1U << DEVINDEX_HASHBITS) | |
57 | static struct hlist_head fib_info_devhash[DEVINDEX_HASHSIZE]; | |
58 | ||
59 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
0e884c78 | 60 | u32 fib_multipath_secret __read_mostly; |
1da177e4 | 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); | |
338f665a | 207 | struct dst_metrics *m; |
19c1ea14 | 208 | |
e49cc0da YZ |
209 | change_nexthops(fi) { |
210 | if (nexthop_nh->nh_dev) | |
211 | dev_put(nexthop_nh->nh_dev); | |
5a6228a0 | 212 | lwtstate_put(nexthop_nh->nh_lwtstate); |
caa41527 | 213 | free_nh_exceptions(nexthop_nh); |
c5038a83 DM |
214 | rt_fibinfo_free_cpus(nexthop_nh->nh_pcpu_rth_output); |
215 | rt_fibinfo_free(&nexthop_nh->nh_rth_input); | |
e49cc0da YZ |
216 | } endfor_nexthops(fi); |
217 | ||
338f665a ED |
218 | m = fi->fib_metrics; |
219 | if (m != &dst_default_metrics && atomic_dec_and_test(&m->refcnt)) | |
220 | kfree(m); | |
19c1ea14 YZ |
221 | kfree(fi); |
222 | } | |
1da177e4 LT |
223 | |
224 | void free_fib_info(struct fib_info *fi) | |
225 | { | |
226 | if (fi->fib_dead == 0) { | |
058bd4d2 | 227 | pr_warn("Freeing alive fib_info %p\n", fi); |
1da177e4 LT |
228 | return; |
229 | } | |
1da177e4 | 230 | fib_info_cnt--; |
7a9bc9b8 DM |
231 | #ifdef CONFIG_IP_ROUTE_CLASSID |
232 | change_nexthops(fi) { | |
233 | if (nexthop_nh->nh_tclassid) | |
f4530fa5 | 234 | fi->fib_net->ipv4.fib_num_tclassid_users--; |
7a9bc9b8 DM |
235 | } endfor_nexthops(fi); |
236 | #endif | |
19c1ea14 | 237 | call_rcu(&fi->rcu, free_fib_info_rcu); |
1da177e4 LT |
238 | } |
239 | ||
240 | void fib_release_info(struct fib_info *fi) | |
241 | { | |
832b4c5e | 242 | spin_lock_bh(&fib_info_lock); |
1da177e4 LT |
243 | if (fi && --fi->fib_treeref == 0) { |
244 | hlist_del(&fi->fib_hash); | |
245 | if (fi->fib_prefsrc) | |
246 | hlist_del(&fi->fib_lhash); | |
247 | change_nexthops(fi) { | |
71fceff0 | 248 | if (!nexthop_nh->nh_dev) |
1da177e4 | 249 | continue; |
71fceff0 | 250 | hlist_del(&nexthop_nh->nh_hash); |
1da177e4 LT |
251 | } endfor_nexthops(fi) |
252 | fi->fib_dead = 1; | |
253 | fib_info_put(fi); | |
254 | } | |
832b4c5e | 255 | spin_unlock_bh(&fib_info_lock); |
1da177e4 LT |
256 | } |
257 | ||
6a31d2a9 | 258 | static inline int nh_comp(const struct fib_info *fi, const struct fib_info *ofi) |
1da177e4 LT |
259 | { |
260 | const struct fib_nh *onh = ofi->fib_nh; | |
261 | ||
262 | for_nexthops(fi) { | |
263 | if (nh->nh_oif != onh->nh_oif || | |
264 | nh->nh_gw != onh->nh_gw || | |
265 | nh->nh_scope != onh->nh_scope || | |
266 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
267 | nh->nh_weight != onh->nh_weight || | |
268 | #endif | |
c7066f70 | 269 | #ifdef CONFIG_IP_ROUTE_CLASSID |
1da177e4 LT |
270 | nh->nh_tclassid != onh->nh_tclassid || |
271 | #endif | |
571e7226 | 272 | lwtunnel_cmp_encap(nh->nh_lwtstate, onh->nh_lwtstate) || |
8a3d0316 | 273 | ((nh->nh_flags ^ onh->nh_flags) & ~RTNH_COMPARE_MASK)) |
1da177e4 LT |
274 | return -1; |
275 | onh++; | |
276 | } endfor_nexthops(fi); | |
277 | return 0; | |
278 | } | |
279 | ||
88ebc72f DM |
280 | static inline unsigned int fib_devindex_hashfn(unsigned int val) |
281 | { | |
282 | unsigned int mask = DEVINDEX_HASHSIZE - 1; | |
283 | ||
284 | return (val ^ | |
285 | (val >> DEVINDEX_HASHBITS) ^ | |
286 | (val >> (DEVINDEX_HASHBITS * 2))) & mask; | |
287 | } | |
288 | ||
1da177e4 LT |
289 | static inline unsigned int fib_info_hashfn(const struct fib_info *fi) |
290 | { | |
123b9731 | 291 | unsigned int mask = (fib_info_hash_size - 1); |
1da177e4 LT |
292 | unsigned int val = fi->fib_nhs; |
293 | ||
37e826c5 | 294 | val ^= (fi->fib_protocol << 8) | fi->fib_scope; |
81f7bf6c | 295 | val ^= (__force u32)fi->fib_prefsrc; |
1da177e4 | 296 | val ^= fi->fib_priority; |
88ebc72f DM |
297 | for_nexthops(fi) { |
298 | val ^= fib_devindex_hashfn(nh->nh_oif); | |
299 | } endfor_nexthops(fi) | |
1da177e4 LT |
300 | |
301 | return (val ^ (val >> 7) ^ (val >> 12)) & mask; | |
302 | } | |
303 | ||
304 | static struct fib_info *fib_find_info(const struct fib_info *nfi) | |
305 | { | |
306 | struct hlist_head *head; | |
1da177e4 LT |
307 | struct fib_info *fi; |
308 | unsigned int hash; | |
309 | ||
310 | hash = fib_info_hashfn(nfi); | |
311 | head = &fib_info_hash[hash]; | |
312 | ||
b67bfe0d | 313 | hlist_for_each_entry(fi, head, fib_hash) { |
09ad9bc7 | 314 | if (!net_eq(fi->fib_net, nfi->fib_net)) |
4814bdbd | 315 | continue; |
1da177e4 LT |
316 | if (fi->fib_nhs != nfi->fib_nhs) |
317 | continue; | |
318 | if (nfi->fib_protocol == fi->fib_protocol && | |
37e826c5 | 319 | nfi->fib_scope == fi->fib_scope && |
1da177e4 LT |
320 | nfi->fib_prefsrc == fi->fib_prefsrc && |
321 | nfi->fib_priority == fi->fib_priority && | |
f4ef85bb | 322 | nfi->fib_type == fi->fib_type && |
1da177e4 | 323 | memcmp(nfi->fib_metrics, fi->fib_metrics, |
fcd13f42 | 324 | sizeof(u32) * RTAX_MAX) == 0 && |
8a3d0316 | 325 | !((nfi->fib_flags ^ fi->fib_flags) & ~RTNH_COMPARE_MASK) && |
1da177e4 LT |
326 | (nfi->fib_nhs == 0 || nh_comp(fi, nfi) == 0)) |
327 | return fi; | |
328 | } | |
329 | ||
330 | return NULL; | |
331 | } | |
332 | ||
1da177e4 | 333 | /* Check, that the gateway is already configured. |
6a31d2a9 | 334 | * Used only by redirect accept routine. |
1da177e4 | 335 | */ |
d878e72e | 336 | int ip_fib_check_default(__be32 gw, struct net_device *dev) |
1da177e4 LT |
337 | { |
338 | struct hlist_head *head; | |
1da177e4 LT |
339 | struct fib_nh *nh; |
340 | unsigned int hash; | |
341 | ||
832b4c5e | 342 | spin_lock(&fib_info_lock); |
1da177e4 LT |
343 | |
344 | hash = fib_devindex_hashfn(dev->ifindex); | |
345 | head = &fib_info_devhash[hash]; | |
b67bfe0d | 346 | hlist_for_each_entry(nh, head, nh_hash) { |
1da177e4 LT |
347 | if (nh->nh_dev == dev && |
348 | nh->nh_gw == gw && | |
6a31d2a9 | 349 | !(nh->nh_flags & RTNH_F_DEAD)) { |
832b4c5e | 350 | spin_unlock(&fib_info_lock); |
1da177e4 LT |
351 | return 0; |
352 | } | |
353 | } | |
354 | ||
832b4c5e | 355 | spin_unlock(&fib_info_lock); |
1da177e4 LT |
356 | |
357 | return -1; | |
358 | } | |
359 | ||
339bf98f TG |
360 | static inline size_t fib_nlmsg_size(struct fib_info *fi) |
361 | { | |
362 | size_t payload = NLMSG_ALIGN(sizeof(struct rtmsg)) | |
363 | + nla_total_size(4) /* RTA_TABLE */ | |
364 | + nla_total_size(4) /* RTA_DST */ | |
365 | + nla_total_size(4) /* RTA_PRIORITY */ | |
ea697639 DB |
366 | + nla_total_size(4) /* RTA_PREFSRC */ |
367 | + nla_total_size(TCP_CA_NAME_MAX); /* RTAX_CC_ALGO */ | |
339bf98f TG |
368 | |
369 | /* space for nested metrics */ | |
370 | payload += nla_total_size((RTAX_MAX * nla_total_size(4))); | |
371 | ||
372 | if (fi->fib_nhs) { | |
571e7226 | 373 | size_t nh_encapsize = 0; |
339bf98f TG |
374 | /* Also handles the special case fib_nhs == 1 */ |
375 | ||
376 | /* each nexthop is packed in an attribute */ | |
377 | size_t nhsize = nla_total_size(sizeof(struct rtnexthop)); | |
378 | ||
379 | /* may contain flow and gateway attribute */ | |
380 | nhsize += 2 * nla_total_size(4); | |
381 | ||
571e7226 RP |
382 | /* grab encap info */ |
383 | for_nexthops(fi) { | |
384 | if (nh->nh_lwtstate) { | |
385 | /* RTA_ENCAP_TYPE */ | |
386 | nh_encapsize += lwtunnel_get_encap_size( | |
387 | nh->nh_lwtstate); | |
388 | /* RTA_ENCAP */ | |
389 | nh_encapsize += nla_total_size(2); | |
390 | } | |
391 | } endfor_nexthops(fi); | |
392 | ||
339bf98f | 393 | /* all nexthops are packed in a nested attribute */ |
571e7226 RP |
394 | payload += nla_total_size((fi->fib_nhs * nhsize) + |
395 | nh_encapsize); | |
396 | ||
339bf98f TG |
397 | } |
398 | ||
399 | return payload; | |
400 | } | |
401 | ||
81f7bf6c | 402 | void rtmsg_fib(int event, __be32 key, struct fib_alias *fa, |
9877b253 | 403 | int dst_len, u32 tb_id, const struct nl_info *info, |
b8f55831 | 404 | unsigned int nlm_flags) |
1da177e4 LT |
405 | { |
406 | struct sk_buff *skb; | |
4e902c57 | 407 | u32 seq = info->nlh ? info->nlh->nlmsg_seq : 0; |
f21c7bc5 | 408 | int err = -ENOBUFS; |
1da177e4 | 409 | |
339bf98f | 410 | skb = nlmsg_new(fib_nlmsg_size(fa->fa_info), GFP_KERNEL); |
51456b29 | 411 | if (!skb) |
f21c7bc5 | 412 | goto errout; |
1da177e4 | 413 | |
15e47304 | 414 | err = fib_dump_info(skb, info->portid, seq, event, tb_id, |
37e826c5 | 415 | fa->fa_type, key, dst_len, |
b8f55831 | 416 | fa->fa_tos, fa->fa_info, nlm_flags); |
26932566 PM |
417 | if (err < 0) { |
418 | /* -EMSGSIZE implies BUG in fib_nlmsg_size() */ | |
419 | WARN_ON(err == -EMSGSIZE); | |
420 | kfree_skb(skb); | |
421 | goto errout; | |
422 | } | |
15e47304 | 423 | rtnl_notify(skb, info->nl_net, info->portid, RTNLGRP_IPV4_ROUTE, |
1ce85fe4 PNA |
424 | info->nlh, GFP_KERNEL); |
425 | return; | |
f21c7bc5 TG |
426 | errout: |
427 | if (err < 0) | |
4d1169c1 | 428 | rtnl_set_sk_err(info->nl_net, RTNLGRP_IPV4_ROUTE, err); |
1da177e4 LT |
429 | } |
430 | ||
c9cb6b6e SH |
431 | static int fib_detect_death(struct fib_info *fi, int order, |
432 | struct fib_info **last_resort, int *last_idx, | |
433 | int dflt) | |
1da177e4 LT |
434 | { |
435 | struct neighbour *n; | |
436 | int state = NUD_NONE; | |
437 | ||
438 | n = neigh_lookup(&arp_tbl, &fi->fib_nh[0].nh_gw, fi->fib_dev); | |
439 | if (n) { | |
440 | state = n->nud_state; | |
441 | neigh_release(n); | |
88f64320 JA |
442 | } else { |
443 | return 0; | |
1da177e4 | 444 | } |
d9319100 | 445 | if (state == NUD_REACHABLE) |
1da177e4 | 446 | return 0; |
6a31d2a9 | 447 | if ((state & NUD_VALID) && order != dflt) |
1da177e4 | 448 | return 0; |
6a31d2a9 | 449 | if ((state & NUD_VALID) || |
88f64320 | 450 | (*last_idx < 0 && order > dflt && state != NUD_INCOMPLETE)) { |
1da177e4 LT |
451 | *last_resort = fi; |
452 | *last_idx = order; | |
453 | } | |
454 | return 1; | |
455 | } | |
456 | ||
457 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
458 | ||
4e902c57 | 459 | static int fib_count_nexthops(struct rtnexthop *rtnh, int remaining) |
1da177e4 LT |
460 | { |
461 | int nhs = 0; | |
1da177e4 | 462 | |
4e902c57 | 463 | while (rtnh_ok(rtnh, remaining)) { |
1da177e4 | 464 | nhs++; |
4e902c57 TG |
465 | rtnh = rtnh_next(rtnh, &remaining); |
466 | } | |
467 | ||
468 | /* leftover implies invalid nexthop configuration, discard it */ | |
469 | return remaining > 0 ? 0 : nhs; | |
1da177e4 LT |
470 | } |
471 | ||
4e902c57 TG |
472 | static int fib_get_nhs(struct fib_info *fi, struct rtnexthop *rtnh, |
473 | int remaining, struct fib_config *cfg) | |
1da177e4 | 474 | { |
571e7226 RP |
475 | struct net *net = cfg->fc_nlinfo.nl_net; |
476 | int ret; | |
477 | ||
1da177e4 | 478 | change_nexthops(fi) { |
4e902c57 TG |
479 | int attrlen; |
480 | ||
481 | if (!rtnh_ok(rtnh, remaining)) | |
1da177e4 | 482 | return -EINVAL; |
4e902c57 | 483 | |
a9c22185 JA |
484 | if (rtnh->rtnh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)) |
485 | return -EINVAL; | |
486 | ||
71fceff0 DM |
487 | nexthop_nh->nh_flags = |
488 | (cfg->fc_flags & ~0xFF) | rtnh->rtnh_flags; | |
489 | nexthop_nh->nh_oif = rtnh->rtnh_ifindex; | |
490 | nexthop_nh->nh_weight = rtnh->rtnh_hops + 1; | |
4e902c57 TG |
491 | |
492 | attrlen = rtnh_attrlen(rtnh); | |
493 | if (attrlen > 0) { | |
494 | struct nlattr *nla, *attrs = rtnh_attrs(rtnh); | |
495 | ||
496 | nla = nla_find(attrs, attrlen, RTA_GATEWAY); | |
67b61f6c | 497 | nexthop_nh->nh_gw = nla ? nla_get_in_addr(nla) : 0; |
c7066f70 | 498 | #ifdef CONFIG_IP_ROUTE_CLASSID |
4e902c57 | 499 | nla = nla_find(attrs, attrlen, RTA_FLOW); |
71fceff0 | 500 | nexthop_nh->nh_tclassid = nla ? nla_get_u32(nla) : 0; |
7a9bc9b8 | 501 | if (nexthop_nh->nh_tclassid) |
f4530fa5 | 502 | fi->fib_net->ipv4.fib_num_tclassid_users++; |
1da177e4 | 503 | #endif |
571e7226 RP |
504 | nla = nla_find(attrs, attrlen, RTA_ENCAP); |
505 | if (nla) { | |
506 | struct lwtunnel_state *lwtstate; | |
507 | struct net_device *dev = NULL; | |
508 | struct nlattr *nla_entype; | |
509 | ||
510 | nla_entype = nla_find(attrs, attrlen, | |
511 | RTA_ENCAP_TYPE); | |
512 | if (!nla_entype) | |
513 | goto err_inval; | |
514 | if (cfg->fc_oif) | |
515 | dev = __dev_get_by_index(net, cfg->fc_oif); | |
516 | ret = lwtunnel_build_state(dev, nla_get_u16( | |
517 | nla_entype), | |
127eb7cd TH |
518 | nla, AF_INET, cfg, |
519 | &lwtstate); | |
571e7226 RP |
520 | if (ret) |
521 | goto errout; | |
5a6228a0 ND |
522 | nexthop_nh->nh_lwtstate = |
523 | lwtstate_get(lwtstate); | |
571e7226 | 524 | } |
1da177e4 | 525 | } |
4e902c57 TG |
526 | |
527 | rtnh = rtnh_next(rtnh, &remaining); | |
1da177e4 | 528 | } endfor_nexthops(fi); |
4e902c57 | 529 | |
1da177e4 | 530 | return 0; |
571e7226 RP |
531 | |
532 | err_inval: | |
533 | ret = -EINVAL; | |
534 | ||
535 | errout: | |
536 | return ret; | |
1da177e4 LT |
537 | } |
538 | ||
0e884c78 PN |
539 | static void fib_rebalance(struct fib_info *fi) |
540 | { | |
541 | int total; | |
542 | int w; | |
543 | struct in_device *in_dev; | |
544 | ||
545 | if (fi->fib_nhs < 2) | |
546 | return; | |
547 | ||
548 | total = 0; | |
549 | for_nexthops(fi) { | |
550 | if (nh->nh_flags & RTNH_F_DEAD) | |
551 | continue; | |
552 | ||
51161aa9 | 553 | in_dev = __in_dev_get_rtnl(nh->nh_dev); |
0e884c78 PN |
554 | |
555 | if (in_dev && | |
556 | IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev) && | |
557 | nh->nh_flags & RTNH_F_LINKDOWN) | |
558 | continue; | |
559 | ||
560 | total += nh->nh_weight; | |
561 | } endfor_nexthops(fi); | |
562 | ||
563 | w = 0; | |
564 | change_nexthops(fi) { | |
565 | int upper_bound; | |
566 | ||
51161aa9 | 567 | in_dev = __in_dev_get_rtnl(nexthop_nh->nh_dev); |
0e884c78 PN |
568 | |
569 | if (nexthop_nh->nh_flags & RTNH_F_DEAD) { | |
570 | upper_bound = -1; | |
571 | } else if (in_dev && | |
572 | IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev) && | |
573 | nexthop_nh->nh_flags & RTNH_F_LINKDOWN) { | |
574 | upper_bound = -1; | |
575 | } else { | |
576 | w += nexthop_nh->nh_weight; | |
0a837fe4 PN |
577 | upper_bound = DIV_ROUND_CLOSEST_ULL((u64)w << 31, |
578 | total) - 1; | |
0e884c78 PN |
579 | } |
580 | ||
581 | atomic_set(&nexthop_nh->nh_upper_bound, upper_bound); | |
582 | } endfor_nexthops(fi); | |
583 | ||
584 | net_get_random_once(&fib_multipath_secret, | |
585 | sizeof(fib_multipath_secret)); | |
586 | } | |
587 | ||
588 | static inline void fib_add_weight(struct fib_info *fi, | |
589 | const struct fib_nh *nh) | |
590 | { | |
591 | fi->fib_weight += nh->nh_weight; | |
592 | } | |
593 | ||
594 | #else /* CONFIG_IP_ROUTE_MULTIPATH */ | |
595 | ||
596 | #define fib_rebalance(fi) do { } while (0) | |
597 | #define fib_add_weight(fi, nh) do { } while (0) | |
598 | ||
599 | #endif /* CONFIG_IP_ROUTE_MULTIPATH */ | |
1da177e4 | 600 | |
e01286ef YX |
601 | static int fib_encap_match(struct net *net, u16 encap_type, |
602 | struct nlattr *encap, | |
127eb7cd TH |
603 | int oif, const struct fib_nh *nh, |
604 | const struct fib_config *cfg) | |
571e7226 RP |
605 | { |
606 | struct lwtunnel_state *lwtstate; | |
607 | struct net_device *dev = NULL; | |
df383e62 | 608 | int ret, result = 0; |
571e7226 RP |
609 | |
610 | if (encap_type == LWTUNNEL_ENCAP_NONE) | |
611 | return 0; | |
612 | ||
613 | if (oif) | |
614 | dev = __dev_get_by_index(net, oif); | |
127eb7cd TH |
615 | ret = lwtunnel_build_state(dev, encap_type, encap, |
616 | AF_INET, cfg, &lwtstate); | |
df383e62 JB |
617 | if (!ret) { |
618 | result = lwtunnel_cmp_encap(lwtstate, nh->nh_lwtstate); | |
619 | lwtstate_free(lwtstate); | |
620 | } | |
571e7226 | 621 | |
df383e62 | 622 | return result; |
571e7226 RP |
623 | } |
624 | ||
4e902c57 | 625 | int fib_nh_match(struct fib_config *cfg, struct fib_info *fi) |
1da177e4 | 626 | { |
571e7226 | 627 | struct net *net = cfg->fc_nlinfo.nl_net; |
1da177e4 | 628 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
4e902c57 TG |
629 | struct rtnexthop *rtnh; |
630 | int remaining; | |
1da177e4 LT |
631 | #endif |
632 | ||
4e902c57 | 633 | if (cfg->fc_priority && cfg->fc_priority != fi->fib_priority) |
1da177e4 LT |
634 | return 1; |
635 | ||
4e902c57 | 636 | if (cfg->fc_oif || cfg->fc_gw) { |
571e7226 RP |
637 | if (cfg->fc_encap) { |
638 | if (fib_encap_match(net, cfg->fc_encap_type, | |
639 | cfg->fc_encap, cfg->fc_oif, | |
127eb7cd | 640 | fi->fib_nh, cfg)) |
571e7226 RP |
641 | return 1; |
642 | } | |
4e902c57 TG |
643 | if ((!cfg->fc_oif || cfg->fc_oif == fi->fib_nh->nh_oif) && |
644 | (!cfg->fc_gw || cfg->fc_gw == fi->fib_nh->nh_gw)) | |
1da177e4 LT |
645 | return 0; |
646 | return 1; | |
647 | } | |
648 | ||
649 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
51456b29 | 650 | if (!cfg->fc_mp) |
1da177e4 | 651 | return 0; |
4e902c57 TG |
652 | |
653 | rtnh = cfg->fc_mp; | |
654 | remaining = cfg->fc_mp_len; | |
e905a9ed | 655 | |
1da177e4 | 656 | for_nexthops(fi) { |
4e902c57 | 657 | int attrlen; |
1da177e4 | 658 | |
4e902c57 | 659 | if (!rtnh_ok(rtnh, remaining)) |
1da177e4 | 660 | return -EINVAL; |
4e902c57 TG |
661 | |
662 | if (rtnh->rtnh_ifindex && rtnh->rtnh_ifindex != nh->nh_oif) | |
1da177e4 | 663 | return 1; |
4e902c57 TG |
664 | |
665 | attrlen = rtnh_attrlen(rtnh); | |
f76936d0 | 666 | if (attrlen > 0) { |
4e902c57 TG |
667 | struct nlattr *nla, *attrs = rtnh_attrs(rtnh); |
668 | ||
669 | nla = nla_find(attrs, attrlen, RTA_GATEWAY); | |
67b61f6c | 670 | if (nla && nla_get_in_addr(nla) != nh->nh_gw) |
1da177e4 | 671 | return 1; |
c7066f70 | 672 | #ifdef CONFIG_IP_ROUTE_CLASSID |
4e902c57 TG |
673 | nla = nla_find(attrs, attrlen, RTA_FLOW); |
674 | if (nla && nla_get_u32(nla) != nh->nh_tclassid) | |
1da177e4 LT |
675 | return 1; |
676 | #endif | |
677 | } | |
4e902c57 TG |
678 | |
679 | rtnh = rtnh_next(rtnh, &remaining); | |
1da177e4 LT |
680 | } endfor_nexthops(fi); |
681 | #endif | |
682 | return 0; | |
683 | } | |
684 | ||
685 | ||
686 | /* | |
6a31d2a9 ED |
687 | * Picture |
688 | * ------- | |
689 | * | |
690 | * Semantics of nexthop is very messy by historical reasons. | |
691 | * We have to take into account, that: | |
692 | * a) gateway can be actually local interface address, | |
693 | * so that gatewayed route is direct. | |
694 | * b) gateway must be on-link address, possibly | |
695 | * described not by an ifaddr, but also by a direct route. | |
696 | * c) If both gateway and interface are specified, they should not | |
697 | * contradict. | |
698 | * d) If we use tunnel routes, gateway could be not on-link. | |
699 | * | |
700 | * Attempt to reconcile all of these (alas, self-contradictory) conditions | |
701 | * results in pretty ugly and hairy code with obscure logic. | |
702 | * | |
703 | * I chose to generalized it instead, so that the size | |
704 | * of code does not increase practically, but it becomes | |
705 | * much more general. | |
706 | * Every prefix is assigned a "scope" value: "host" is local address, | |
707 | * "link" is direct route, | |
708 | * [ ... "site" ... "interior" ... ] | |
709 | * and "universe" is true gateway route with global meaning. | |
710 | * | |
711 | * Every prefix refers to a set of "nexthop"s (gw, oif), | |
712 | * where gw must have narrower scope. This recursion stops | |
713 | * when gw has LOCAL scope or if "nexthop" is declared ONLINK, | |
714 | * which means that gw is forced to be on link. | |
715 | * | |
716 | * Code is still hairy, but now it is apparently logically | |
717 | * consistent and very flexible. F.e. as by-product it allows | |
718 | * to co-exists in peace independent exterior and interior | |
719 | * routing processes. | |
720 | * | |
721 | * Normally it looks as following. | |
722 | * | |
723 | * {universe prefix} -> (gw, oif) [scope link] | |
724 | * | | |
725 | * |-> {link prefix} -> (gw, oif) [scope local] | |
726 | * | | |
727 | * |-> {local prefix} (terminal node) | |
1da177e4 | 728 | */ |
4e902c57 TG |
729 | static int fib_check_nh(struct fib_config *cfg, struct fib_info *fi, |
730 | struct fib_nh *nh) | |
1da177e4 | 731 | { |
127eb7cd | 732 | int err = 0; |
86167a37 | 733 | struct net *net; |
6a31d2a9 | 734 | struct net_device *dev; |
1da177e4 | 735 | |
86167a37 | 736 | net = cfg->fc_nlinfo.nl_net; |
1da177e4 LT |
737 | if (nh->nh_gw) { |
738 | struct fib_result res; | |
739 | ||
6a31d2a9 | 740 | if (nh->nh_flags & RTNH_F_ONLINK) { |
30bbaa19 | 741 | unsigned int addr_type; |
1da177e4 | 742 | |
4e902c57 | 743 | if (cfg->fc_scope >= RT_SCOPE_LINK) |
1da177e4 | 744 | return -EINVAL; |
6a31d2a9 ED |
745 | dev = __dev_get_by_index(net, nh->nh_oif); |
746 | if (!dev) | |
1da177e4 | 747 | return -ENODEV; |
6a31d2a9 | 748 | if (!(dev->flags & IFF_UP)) |
1da177e4 | 749 | return -ENETDOWN; |
30bbaa19 DA |
750 | addr_type = inet_addr_type_dev_table(net, dev, nh->nh_gw); |
751 | if (addr_type != RTN_UNICAST) | |
752 | return -EINVAL; | |
8a3d0316 AG |
753 | if (!netif_carrier_ok(dev)) |
754 | nh->nh_flags |= RTNH_F_LINKDOWN; | |
1da177e4 LT |
755 | nh->nh_dev = dev; |
756 | dev_hold(dev); | |
757 | nh->nh_scope = RT_SCOPE_LINK; | |
758 | return 0; | |
759 | } | |
ebc0ffae | 760 | rcu_read_lock(); |
1da177e4 | 761 | { |
3bfd8472 | 762 | struct fib_table *tbl = NULL; |
9ade2286 DM |
763 | struct flowi4 fl4 = { |
764 | .daddr = nh->nh_gw, | |
765 | .flowi4_scope = cfg->fc_scope + 1, | |
766 | .flowi4_oif = nh->nh_oif, | |
6a662719 | 767 | .flowi4_iif = LOOPBACK_IFINDEX, |
4e902c57 | 768 | }; |
1da177e4 LT |
769 | |
770 | /* It is not necessary, but requires a bit of thinking */ | |
9ade2286 DM |
771 | if (fl4.flowi4_scope < RT_SCOPE_LINK) |
772 | fl4.flowi4_scope = RT_SCOPE_LINK; | |
3bfd8472 DA |
773 | |
774 | if (cfg->fc_table) | |
775 | tbl = fib_get_table(net, cfg->fc_table); | |
776 | ||
777 | if (tbl) | |
778 | err = fib_table_lookup(tbl, &fl4, &res, | |
1e313678 ED |
779 | FIB_LOOKUP_IGNORE_LINKSTATE | |
780 | FIB_LOOKUP_NOREF); | |
4c9bcd11 DA |
781 | |
782 | /* on error or if no table given do full lookup. This | |
783 | * is needed for example when nexthops are in the local | |
784 | * table rather than the given table | |
785 | */ | |
786 | if (!tbl || err) { | |
3bfd8472 DA |
787 | err = fib_lookup(net, &fl4, &res, |
788 | FIB_LOOKUP_IGNORE_LINKSTATE); | |
4c9bcd11 DA |
789 | } |
790 | ||
ebc0ffae ED |
791 | if (err) { |
792 | rcu_read_unlock(); | |
1da177e4 | 793 | return err; |
ebc0ffae | 794 | } |
1da177e4 LT |
795 | } |
796 | err = -EINVAL; | |
797 | if (res.type != RTN_UNICAST && res.type != RTN_LOCAL) | |
798 | goto out; | |
799 | nh->nh_scope = res.scope; | |
800 | nh->nh_oif = FIB_RES_OIF(res); | |
6a31d2a9 ED |
801 | nh->nh_dev = dev = FIB_RES_DEV(res); |
802 | if (!dev) | |
1da177e4 | 803 | goto out; |
6a31d2a9 | 804 | dev_hold(dev); |
8a3d0316 AG |
805 | if (!netif_carrier_ok(dev)) |
806 | nh->nh_flags |= RTNH_F_LINKDOWN; | |
8723e1b4 | 807 | err = (dev->flags & IFF_UP) ? 0 : -ENETDOWN; |
1da177e4 LT |
808 | } else { |
809 | struct in_device *in_dev; | |
810 | ||
6a31d2a9 | 811 | if (nh->nh_flags & (RTNH_F_PERVASIVE | RTNH_F_ONLINK)) |
1da177e4 LT |
812 | return -EINVAL; |
813 | ||
8723e1b4 ED |
814 | rcu_read_lock(); |
815 | err = -ENODEV; | |
86167a37 | 816 | in_dev = inetdev_by_index(net, nh->nh_oif); |
51456b29 | 817 | if (!in_dev) |
8723e1b4 ED |
818 | goto out; |
819 | err = -ENETDOWN; | |
820 | if (!(in_dev->dev->flags & IFF_UP)) | |
821 | goto out; | |
1da177e4 LT |
822 | nh->nh_dev = in_dev->dev; |
823 | dev_hold(nh->nh_dev); | |
824 | nh->nh_scope = RT_SCOPE_HOST; | |
8a3d0316 AG |
825 | if (!netif_carrier_ok(nh->nh_dev)) |
826 | nh->nh_flags |= RTNH_F_LINKDOWN; | |
8723e1b4 | 827 | err = 0; |
1da177e4 | 828 | } |
8723e1b4 ED |
829 | out: |
830 | rcu_read_unlock(); | |
831 | return err; | |
1da177e4 LT |
832 | } |
833 | ||
81f7bf6c | 834 | static inline unsigned int fib_laddr_hashfn(__be32 val) |
1da177e4 | 835 | { |
123b9731 | 836 | unsigned int mask = (fib_info_hash_size - 1); |
1da177e4 | 837 | |
6a31d2a9 ED |
838 | return ((__force u32)val ^ |
839 | ((__force u32)val >> 7) ^ | |
840 | ((__force u32)val >> 14)) & mask; | |
1da177e4 LT |
841 | } |
842 | ||
123b9731 | 843 | static struct hlist_head *fib_info_hash_alloc(int bytes) |
1da177e4 LT |
844 | { |
845 | if (bytes <= PAGE_SIZE) | |
88f83491 | 846 | return kzalloc(bytes, GFP_KERNEL); |
1da177e4 LT |
847 | else |
848 | return (struct hlist_head *) | |
6a31d2a9 ED |
849 | __get_free_pages(GFP_KERNEL | __GFP_ZERO, |
850 | get_order(bytes)); | |
1da177e4 LT |
851 | } |
852 | ||
123b9731 | 853 | static void fib_info_hash_free(struct hlist_head *hash, int bytes) |
1da177e4 LT |
854 | { |
855 | if (!hash) | |
856 | return; | |
857 | ||
858 | if (bytes <= PAGE_SIZE) | |
859 | kfree(hash); | |
860 | else | |
861 | free_pages((unsigned long) hash, get_order(bytes)); | |
862 | } | |
863 | ||
123b9731 DM |
864 | static void fib_info_hash_move(struct hlist_head *new_info_hash, |
865 | struct hlist_head *new_laddrhash, | |
866 | unsigned int new_size) | |
1da177e4 | 867 | { |
b7656e7f | 868 | struct hlist_head *old_info_hash, *old_laddrhash; |
123b9731 | 869 | unsigned int old_size = fib_info_hash_size; |
b7656e7f | 870 | unsigned int i, bytes; |
1da177e4 | 871 | |
832b4c5e | 872 | spin_lock_bh(&fib_info_lock); |
b7656e7f DM |
873 | old_info_hash = fib_info_hash; |
874 | old_laddrhash = fib_info_laddrhash; | |
123b9731 | 875 | fib_info_hash_size = new_size; |
1da177e4 LT |
876 | |
877 | for (i = 0; i < old_size; i++) { | |
878 | struct hlist_head *head = &fib_info_hash[i]; | |
b67bfe0d | 879 | struct hlist_node *n; |
1da177e4 LT |
880 | struct fib_info *fi; |
881 | ||
b67bfe0d | 882 | hlist_for_each_entry_safe(fi, n, head, fib_hash) { |
1da177e4 LT |
883 | struct hlist_head *dest; |
884 | unsigned int new_hash; | |
885 | ||
1da177e4 LT |
886 | new_hash = fib_info_hashfn(fi); |
887 | dest = &new_info_hash[new_hash]; | |
888 | hlist_add_head(&fi->fib_hash, dest); | |
889 | } | |
890 | } | |
891 | fib_info_hash = new_info_hash; | |
892 | ||
893 | for (i = 0; i < old_size; i++) { | |
894 | struct hlist_head *lhead = &fib_info_laddrhash[i]; | |
b67bfe0d | 895 | struct hlist_node *n; |
1da177e4 LT |
896 | struct fib_info *fi; |
897 | ||
b67bfe0d | 898 | hlist_for_each_entry_safe(fi, n, lhead, fib_lhash) { |
1da177e4 LT |
899 | struct hlist_head *ldest; |
900 | unsigned int new_hash; | |
901 | ||
1da177e4 LT |
902 | new_hash = fib_laddr_hashfn(fi->fib_prefsrc); |
903 | ldest = &new_laddrhash[new_hash]; | |
904 | hlist_add_head(&fi->fib_lhash, ldest); | |
905 | } | |
906 | } | |
907 | fib_info_laddrhash = new_laddrhash; | |
908 | ||
832b4c5e | 909 | spin_unlock_bh(&fib_info_lock); |
b7656e7f DM |
910 | |
911 | bytes = old_size * sizeof(struct hlist_head *); | |
123b9731 DM |
912 | fib_info_hash_free(old_info_hash, bytes); |
913 | fib_info_hash_free(old_laddrhash, bytes); | |
1da177e4 LT |
914 | } |
915 | ||
436c3b66 DM |
916 | __be32 fib_info_update_nh_saddr(struct net *net, struct fib_nh *nh) |
917 | { | |
918 | nh->nh_saddr = inet_select_addr(nh->nh_dev, | |
919 | nh->nh_gw, | |
37e826c5 | 920 | nh->nh_parent->fib_scope); |
436c3b66 DM |
921 | nh->nh_saddr_genid = atomic_read(&net->ipv4.dev_addr_genid); |
922 | ||
923 | return nh->nh_saddr; | |
924 | } | |
925 | ||
021dd3b8 DA |
926 | static bool fib_valid_prefsrc(struct fib_config *cfg, __be32 fib_prefsrc) |
927 | { | |
928 | if (cfg->fc_type != RTN_LOCAL || !cfg->fc_dst || | |
929 | fib_prefsrc != cfg->fc_dst) { | |
9b8ff518 | 930 | u32 tb_id = cfg->fc_table; |
e1b8d903 | 931 | int rc; |
021dd3b8 DA |
932 | |
933 | if (tb_id == RT_TABLE_MAIN) | |
934 | tb_id = RT_TABLE_LOCAL; | |
935 | ||
e1b8d903 DA |
936 | rc = inet_addr_type_table(cfg->fc_nlinfo.nl_net, |
937 | fib_prefsrc, tb_id); | |
938 | ||
939 | if (rc != RTN_LOCAL && tb_id != RT_TABLE_LOCAL) { | |
940 | rc = inet_addr_type_table(cfg->fc_nlinfo.nl_net, | |
941 | fib_prefsrc, RT_TABLE_LOCAL); | |
021dd3b8 | 942 | } |
e1b8d903 DA |
943 | |
944 | if (rc != RTN_LOCAL) | |
945 | return false; | |
021dd3b8 DA |
946 | } |
947 | return true; | |
948 | } | |
949 | ||
6cf9dfd3 FW |
950 | static int |
951 | fib_convert_metrics(struct fib_info *fi, const struct fib_config *cfg) | |
952 | { | |
c3a8d947 | 953 | bool ecn_ca = false; |
6cf9dfd3 FW |
954 | struct nlattr *nla; |
955 | int remaining; | |
956 | ||
957 | if (!cfg->fc_mx) | |
958 | return 0; | |
959 | ||
960 | nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) { | |
961 | int type = nla_type(nla); | |
962 | u32 val; | |
963 | ||
964 | if (!type) | |
965 | continue; | |
966 | if (type > RTAX_MAX) | |
967 | return -EINVAL; | |
968 | ||
969 | if (type == RTAX_CC_ALGO) { | |
970 | char tmp[TCP_CA_NAME_MAX]; | |
971 | ||
972 | nla_strlcpy(tmp, nla, sizeof(tmp)); | |
c3a8d947 | 973 | val = tcp_ca_get_key_by_name(tmp, &ecn_ca); |
6cf9dfd3 FW |
974 | if (val == TCP_CA_UNSPEC) |
975 | return -EINVAL; | |
976 | } else { | |
977 | val = nla_get_u32(nla); | |
978 | } | |
979 | if (type == RTAX_ADVMSS && val > 65535 - 40) | |
980 | val = 65535 - 40; | |
981 | if (type == RTAX_MTU && val > 65535 - 15) | |
982 | val = 65535 - 15; | |
1c76c5d5 PA |
983 | if (type == RTAX_HOPLIMIT && val > 255) |
984 | val = 255; | |
b8d3e416 DB |
985 | if (type == RTAX_FEATURES && (val & ~RTAX_FEATURE_MASK)) |
986 | return -EINVAL; | |
338f665a | 987 | fi->fib_metrics->metrics[type - 1] = val; |
6cf9dfd3 FW |
988 | } |
989 | ||
c3a8d947 | 990 | if (ecn_ca) |
338f665a | 991 | fi->fib_metrics->metrics[RTAX_FEATURES - 1] |= DST_FEATURE_ECN_CA; |
c3a8d947 | 992 | |
6cf9dfd3 FW |
993 | return 0; |
994 | } | |
995 | ||
4e902c57 | 996 | struct fib_info *fib_create_info(struct fib_config *cfg) |
1da177e4 LT |
997 | { |
998 | int err; | |
999 | struct fib_info *fi = NULL; | |
1000 | struct fib_info *ofi; | |
1da177e4 | 1001 | int nhs = 1; |
7462bd74 | 1002 | struct net *net = cfg->fc_nlinfo.nl_net; |
1da177e4 | 1003 | |
4c8237cd DM |
1004 | if (cfg->fc_type > RTN_MAX) |
1005 | goto err_inval; | |
1006 | ||
1da177e4 | 1007 | /* Fast check to catch the most weird cases */ |
4e902c57 | 1008 | if (fib_props[cfg->fc_type].scope > cfg->fc_scope) |
1da177e4 LT |
1009 | goto err_inval; |
1010 | ||
a9c22185 JA |
1011 | if (cfg->fc_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)) |
1012 | goto err_inval; | |
1013 | ||
1da177e4 | 1014 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
4e902c57 TG |
1015 | if (cfg->fc_mp) { |
1016 | nhs = fib_count_nexthops(cfg->fc_mp, cfg->fc_mp_len); | |
1da177e4 LT |
1017 | if (nhs == 0) |
1018 | goto err_inval; | |
1019 | } | |
1020 | #endif | |
1da177e4 LT |
1021 | |
1022 | err = -ENOBUFS; | |
123b9731 DM |
1023 | if (fib_info_cnt >= fib_info_hash_size) { |
1024 | unsigned int new_size = fib_info_hash_size << 1; | |
1da177e4 LT |
1025 | struct hlist_head *new_info_hash; |
1026 | struct hlist_head *new_laddrhash; | |
1027 | unsigned int bytes; | |
1028 | ||
1029 | if (!new_size) | |
d94ce9b2 | 1030 | new_size = 16; |
1da177e4 | 1031 | bytes = new_size * sizeof(struct hlist_head *); |
123b9731 DM |
1032 | new_info_hash = fib_info_hash_alloc(bytes); |
1033 | new_laddrhash = fib_info_hash_alloc(bytes); | |
1da177e4 | 1034 | if (!new_info_hash || !new_laddrhash) { |
123b9731 DM |
1035 | fib_info_hash_free(new_info_hash, bytes); |
1036 | fib_info_hash_free(new_laddrhash, bytes); | |
88f83491 | 1037 | } else |
123b9731 | 1038 | fib_info_hash_move(new_info_hash, new_laddrhash, new_size); |
1da177e4 | 1039 | |
123b9731 | 1040 | if (!fib_info_hash_size) |
1da177e4 LT |
1041 | goto failure; |
1042 | } | |
1043 | ||
0da974f4 | 1044 | fi = kzalloc(sizeof(*fi)+nhs*sizeof(struct fib_nh), GFP_KERNEL); |
51456b29 | 1045 | if (!fi) |
1da177e4 | 1046 | goto failure; |
aeefa1ec | 1047 | fib_info_cnt++; |
725d1e1b | 1048 | if (cfg->fc_mx) { |
338f665a | 1049 | fi->fib_metrics = kzalloc(sizeof(*fi->fib_metrics), GFP_KERNEL); |
725d1e1b DM |
1050 | if (!fi->fib_metrics) |
1051 | goto failure; | |
338f665a | 1052 | atomic_set(&fi->fib_metrics->refcnt, 1); |
725d1e1b | 1053 | } else |
338f665a | 1054 | fi->fib_metrics = (struct dst_metrics *)&dst_default_metrics; |
1da177e4 | 1055 | |
efd7ef1c | 1056 | fi->fib_net = net; |
4e902c57 | 1057 | fi->fib_protocol = cfg->fc_protocol; |
37e826c5 | 1058 | fi->fib_scope = cfg->fc_scope; |
4e902c57 TG |
1059 | fi->fib_flags = cfg->fc_flags; |
1060 | fi->fib_priority = cfg->fc_priority; | |
1061 | fi->fib_prefsrc = cfg->fc_prefsrc; | |
f4ef85bb | 1062 | fi->fib_type = cfg->fc_type; |
1da177e4 LT |
1063 | |
1064 | fi->fib_nhs = nhs; | |
1065 | change_nexthops(fi) { | |
71fceff0 | 1066 | nexthop_nh->nh_parent = fi; |
d26b3a7c | 1067 | nexthop_nh->nh_pcpu_rth_output = alloc_percpu(struct rtable __rcu *); |
f8a17175 JA |
1068 | if (!nexthop_nh->nh_pcpu_rth_output) |
1069 | goto failure; | |
1da177e4 LT |
1070 | } endfor_nexthops(fi) |
1071 | ||
6cf9dfd3 FW |
1072 | err = fib_convert_metrics(fi, cfg); |
1073 | if (err) | |
1074 | goto failure; | |
1da177e4 | 1075 | |
4e902c57 | 1076 | if (cfg->fc_mp) { |
1da177e4 | 1077 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
4e902c57 TG |
1078 | err = fib_get_nhs(fi, cfg->fc_mp, cfg->fc_mp_len, cfg); |
1079 | if (err != 0) | |
1da177e4 | 1080 | goto failure; |
4e902c57 | 1081 | if (cfg->fc_oif && fi->fib_nh->nh_oif != cfg->fc_oif) |
1da177e4 | 1082 | goto err_inval; |
4e902c57 | 1083 | if (cfg->fc_gw && fi->fib_nh->nh_gw != cfg->fc_gw) |
1da177e4 | 1084 | goto err_inval; |
c7066f70 | 1085 | #ifdef CONFIG_IP_ROUTE_CLASSID |
4e902c57 | 1086 | if (cfg->fc_flow && fi->fib_nh->nh_tclassid != cfg->fc_flow) |
1da177e4 LT |
1087 | goto err_inval; |
1088 | #endif | |
1089 | #else | |
1090 | goto err_inval; | |
1091 | #endif | |
1092 | } else { | |
1093 | struct fib_nh *nh = fi->fib_nh; | |
4e902c57 | 1094 | |
571e7226 RP |
1095 | if (cfg->fc_encap) { |
1096 | struct lwtunnel_state *lwtstate; | |
1097 | struct net_device *dev = NULL; | |
1098 | ||
1099 | if (cfg->fc_encap_type == LWTUNNEL_ENCAP_NONE) | |
1100 | goto err_inval; | |
1101 | if (cfg->fc_oif) | |
1102 | dev = __dev_get_by_index(net, cfg->fc_oif); | |
1103 | err = lwtunnel_build_state(dev, cfg->fc_encap_type, | |
127eb7cd TH |
1104 | cfg->fc_encap, AF_INET, cfg, |
1105 | &lwtstate); | |
571e7226 RP |
1106 | if (err) |
1107 | goto failure; | |
1108 | ||
5a6228a0 | 1109 | nh->nh_lwtstate = lwtstate_get(lwtstate); |
571e7226 | 1110 | } |
4e902c57 TG |
1111 | nh->nh_oif = cfg->fc_oif; |
1112 | nh->nh_gw = cfg->fc_gw; | |
1113 | nh->nh_flags = cfg->fc_flags; | |
c7066f70 | 1114 | #ifdef CONFIG_IP_ROUTE_CLASSID |
4e902c57 | 1115 | nh->nh_tclassid = cfg->fc_flow; |
7a9bc9b8 | 1116 | if (nh->nh_tclassid) |
f4530fa5 | 1117 | fi->fib_net->ipv4.fib_num_tclassid_users++; |
1da177e4 | 1118 | #endif |
1da177e4 LT |
1119 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
1120 | nh->nh_weight = 1; | |
1121 | #endif | |
1122 | } | |
1123 | ||
4e902c57 TG |
1124 | if (fib_props[cfg->fc_type].error) { |
1125 | if (cfg->fc_gw || cfg->fc_oif || cfg->fc_mp) | |
1da177e4 LT |
1126 | goto err_inval; |
1127 | goto link_it; | |
4c8237cd DM |
1128 | } else { |
1129 | switch (cfg->fc_type) { | |
1130 | case RTN_UNICAST: | |
1131 | case RTN_LOCAL: | |
1132 | case RTN_BROADCAST: | |
1133 | case RTN_ANYCAST: | |
1134 | case RTN_MULTICAST: | |
1135 | break; | |
1136 | default: | |
1137 | goto err_inval; | |
1138 | } | |
1da177e4 LT |
1139 | } |
1140 | ||
4e902c57 | 1141 | if (cfg->fc_scope > RT_SCOPE_HOST) |
1da177e4 LT |
1142 | goto err_inval; |
1143 | ||
4e902c57 | 1144 | if (cfg->fc_scope == RT_SCOPE_HOST) { |
1da177e4 LT |
1145 | struct fib_nh *nh = fi->fib_nh; |
1146 | ||
1147 | /* Local address is added. */ | |
1148 | if (nhs != 1 || nh->nh_gw) | |
1149 | goto err_inval; | |
1150 | nh->nh_scope = RT_SCOPE_NOWHERE; | |
7462bd74 | 1151 | nh->nh_dev = dev_get_by_index(net, fi->fib_nh->nh_oif); |
1da177e4 | 1152 | err = -ENODEV; |
51456b29 | 1153 | if (!nh->nh_dev) |
1da177e4 LT |
1154 | goto failure; |
1155 | } else { | |
8a3d0316 AG |
1156 | int linkdown = 0; |
1157 | ||
1da177e4 | 1158 | change_nexthops(fi) { |
6a31d2a9 ED |
1159 | err = fib_check_nh(cfg, fi, nexthop_nh); |
1160 | if (err != 0) | |
1da177e4 | 1161 | goto failure; |
8a3d0316 AG |
1162 | if (nexthop_nh->nh_flags & RTNH_F_LINKDOWN) |
1163 | linkdown++; | |
1da177e4 | 1164 | } endfor_nexthops(fi) |
8a3d0316 AG |
1165 | if (linkdown == fi->fib_nhs) |
1166 | fi->fib_flags |= RTNH_F_LINKDOWN; | |
1da177e4 LT |
1167 | } |
1168 | ||
021dd3b8 DA |
1169 | if (fi->fib_prefsrc && !fib_valid_prefsrc(cfg, fi->fib_prefsrc)) |
1170 | goto err_inval; | |
1da177e4 | 1171 | |
1fc050a1 | 1172 | change_nexthops(fi) { |
436c3b66 | 1173 | fib_info_update_nh_saddr(net, nexthop_nh); |
0e884c78 | 1174 | fib_add_weight(fi, nexthop_nh); |
1fc050a1 DM |
1175 | } endfor_nexthops(fi) |
1176 | ||
0e884c78 PN |
1177 | fib_rebalance(fi); |
1178 | ||
1da177e4 | 1179 | link_it: |
6a31d2a9 ED |
1180 | ofi = fib_find_info(fi); |
1181 | if (ofi) { | |
1da177e4 LT |
1182 | fi->fib_dead = 1; |
1183 | free_fib_info(fi); | |
1184 | ofi->fib_treeref++; | |
1185 | return ofi; | |
1186 | } | |
1187 | ||
1188 | fi->fib_treeref++; | |
1189 | atomic_inc(&fi->fib_clntref); | |
832b4c5e | 1190 | spin_lock_bh(&fib_info_lock); |
1da177e4 LT |
1191 | hlist_add_head(&fi->fib_hash, |
1192 | &fib_info_hash[fib_info_hashfn(fi)]); | |
1193 | if (fi->fib_prefsrc) { | |
1194 | struct hlist_head *head; | |
1195 | ||
1196 | head = &fib_info_laddrhash[fib_laddr_hashfn(fi->fib_prefsrc)]; | |
1197 | hlist_add_head(&fi->fib_lhash, head); | |
1198 | } | |
1199 | change_nexthops(fi) { | |
1200 | struct hlist_head *head; | |
1201 | unsigned int hash; | |
1202 | ||
71fceff0 | 1203 | if (!nexthop_nh->nh_dev) |
1da177e4 | 1204 | continue; |
71fceff0 | 1205 | hash = fib_devindex_hashfn(nexthop_nh->nh_dev->ifindex); |
1da177e4 | 1206 | head = &fib_info_devhash[hash]; |
71fceff0 | 1207 | hlist_add_head(&nexthop_nh->nh_hash, head); |
1da177e4 | 1208 | } endfor_nexthops(fi) |
832b4c5e | 1209 | spin_unlock_bh(&fib_info_lock); |
1da177e4 LT |
1210 | return fi; |
1211 | ||
1212 | err_inval: | |
1213 | err = -EINVAL; | |
1214 | ||
1215 | failure: | |
e905a9ed | 1216 | if (fi) { |
1da177e4 LT |
1217 | fi->fib_dead = 1; |
1218 | free_fib_info(fi); | |
1219 | } | |
4e902c57 TG |
1220 | |
1221 | return ERR_PTR(err); | |
1da177e4 LT |
1222 | } |
1223 | ||
15e47304 | 1224 | int fib_dump_info(struct sk_buff *skb, u32 portid, u32 seq, int event, |
37e826c5 | 1225 | u32 tb_id, u8 type, __be32 dst, int dst_len, u8 tos, |
be403ea1 | 1226 | struct fib_info *fi, unsigned int flags) |
1da177e4 | 1227 | { |
be403ea1 | 1228 | struct nlmsghdr *nlh; |
1da177e4 | 1229 | struct rtmsg *rtm; |
1da177e4 | 1230 | |
15e47304 | 1231 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*rtm), flags); |
51456b29 | 1232 | if (!nlh) |
26932566 | 1233 | return -EMSGSIZE; |
be403ea1 TG |
1234 | |
1235 | rtm = nlmsg_data(nlh); | |
1da177e4 LT |
1236 | rtm->rtm_family = AF_INET; |
1237 | rtm->rtm_dst_len = dst_len; | |
1238 | rtm->rtm_src_len = 0; | |
1239 | rtm->rtm_tos = tos; | |
709772e6 KPO |
1240 | if (tb_id < 256) |
1241 | rtm->rtm_table = tb_id; | |
1242 | else | |
1243 | rtm->rtm_table = RT_TABLE_COMPAT; | |
f3756b79 DM |
1244 | if (nla_put_u32(skb, RTA_TABLE, tb_id)) |
1245 | goto nla_put_failure; | |
1da177e4 LT |
1246 | rtm->rtm_type = type; |
1247 | rtm->rtm_flags = fi->fib_flags; | |
37e826c5 | 1248 | rtm->rtm_scope = fi->fib_scope; |
1da177e4 | 1249 | rtm->rtm_protocol = fi->fib_protocol; |
be403ea1 | 1250 | |
f3756b79 | 1251 | if (rtm->rtm_dst_len && |
930345ea | 1252 | nla_put_in_addr(skb, RTA_DST, dst)) |
f3756b79 DM |
1253 | goto nla_put_failure; |
1254 | if (fi->fib_priority && | |
1255 | nla_put_u32(skb, RTA_PRIORITY, fi->fib_priority)) | |
1256 | goto nla_put_failure; | |
338f665a | 1257 | if (rtnetlink_put_metrics(skb, fi->fib_metrics->metrics) < 0) |
be403ea1 TG |
1258 | goto nla_put_failure; |
1259 | ||
f3756b79 | 1260 | if (fi->fib_prefsrc && |
930345ea | 1261 | nla_put_in_addr(skb, RTA_PREFSRC, fi->fib_prefsrc)) |
f3756b79 | 1262 | goto nla_put_failure; |
1da177e4 | 1263 | if (fi->fib_nhs == 1) { |
0eeb075f AG |
1264 | struct in_device *in_dev; |
1265 | ||
f3756b79 | 1266 | if (fi->fib_nh->nh_gw && |
930345ea | 1267 | nla_put_in_addr(skb, RTA_GATEWAY, fi->fib_nh->nh_gw)) |
f3756b79 DM |
1268 | goto nla_put_failure; |
1269 | if (fi->fib_nh->nh_oif && | |
1270 | nla_put_u32(skb, RTA_OIF, fi->fib_nh->nh_oif)) | |
1271 | goto nla_put_failure; | |
0eeb075f | 1272 | if (fi->fib_nh->nh_flags & RTNH_F_LINKDOWN) { |
96ac5cc9 | 1273 | in_dev = __in_dev_get_rtnl(fi->fib_nh->nh_dev); |
0eeb075f AG |
1274 | if (in_dev && |
1275 | IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev)) | |
1276 | rtm->rtm_flags |= RTNH_F_DEAD; | |
1277 | } | |
c7066f70 | 1278 | #ifdef CONFIG_IP_ROUTE_CLASSID |
f3756b79 DM |
1279 | if (fi->fib_nh[0].nh_tclassid && |
1280 | nla_put_u32(skb, RTA_FLOW, fi->fib_nh[0].nh_tclassid)) | |
1281 | goto nla_put_failure; | |
8265abc0 | 1282 | #endif |
2e84b8ce DA |
1283 | if (fi->fib_nh->nh_lwtstate && |
1284 | lwtunnel_fill_encap(skb, fi->fib_nh->nh_lwtstate) < 0) | |
1285 | goto nla_put_failure; | |
1da177e4 LT |
1286 | } |
1287 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
1288 | if (fi->fib_nhs > 1) { | |
be403ea1 TG |
1289 | struct rtnexthop *rtnh; |
1290 | struct nlattr *mp; | |
1291 | ||
1292 | mp = nla_nest_start(skb, RTA_MULTIPATH); | |
51456b29 | 1293 | if (!mp) |
be403ea1 | 1294 | goto nla_put_failure; |
1da177e4 LT |
1295 | |
1296 | for_nexthops(fi) { | |
0eeb075f AG |
1297 | struct in_device *in_dev; |
1298 | ||
be403ea1 | 1299 | rtnh = nla_reserve_nohdr(skb, sizeof(*rtnh)); |
51456b29 | 1300 | if (!rtnh) |
be403ea1 TG |
1301 | goto nla_put_failure; |
1302 | ||
1303 | rtnh->rtnh_flags = nh->nh_flags & 0xFF; | |
0eeb075f | 1304 | if (nh->nh_flags & RTNH_F_LINKDOWN) { |
96ac5cc9 | 1305 | in_dev = __in_dev_get_rtnl(nh->nh_dev); |
0eeb075f AG |
1306 | if (in_dev && |
1307 | IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev)) | |
1308 | rtnh->rtnh_flags |= RTNH_F_DEAD; | |
1309 | } | |
be403ea1 TG |
1310 | rtnh->rtnh_hops = nh->nh_weight - 1; |
1311 | rtnh->rtnh_ifindex = nh->nh_oif; | |
1312 | ||
f3756b79 | 1313 | if (nh->nh_gw && |
930345ea | 1314 | nla_put_in_addr(skb, RTA_GATEWAY, nh->nh_gw)) |
f3756b79 | 1315 | goto nla_put_failure; |
c7066f70 | 1316 | #ifdef CONFIG_IP_ROUTE_CLASSID |
f3756b79 DM |
1317 | if (nh->nh_tclassid && |
1318 | nla_put_u32(skb, RTA_FLOW, nh->nh_tclassid)) | |
1319 | goto nla_put_failure; | |
8265abc0 | 1320 | #endif |
2e84b8ce DA |
1321 | if (nh->nh_lwtstate && |
1322 | lwtunnel_fill_encap(skb, nh->nh_lwtstate) < 0) | |
1323 | goto nla_put_failure; | |
1324 | ||
be403ea1 TG |
1325 | /* length of rtnetlink header + attributes */ |
1326 | rtnh->rtnh_len = nlmsg_get_pos(skb) - (void *) rtnh; | |
1da177e4 | 1327 | } endfor_nexthops(fi); |
be403ea1 TG |
1328 | |
1329 | nla_nest_end(skb, mp); | |
1da177e4 LT |
1330 | } |
1331 | #endif | |
053c095a JB |
1332 | nlmsg_end(skb, nlh); |
1333 | return 0; | |
1da177e4 | 1334 | |
be403ea1 | 1335 | nla_put_failure: |
26932566 PM |
1336 | nlmsg_cancel(skb, nlh); |
1337 | return -EMSGSIZE; | |
1da177e4 LT |
1338 | } |
1339 | ||
1da177e4 | 1340 | /* |
6a31d2a9 ED |
1341 | * Update FIB if: |
1342 | * - local address disappeared -> we must delete all the entries | |
1343 | * referring to it. | |
1344 | * - device went down -> we must shutdown all nexthops going via it. | |
1da177e4 | 1345 | */ |
4814bdbd | 1346 | int fib_sync_down_addr(struct net *net, __be32 local) |
1da177e4 LT |
1347 | { |
1348 | int ret = 0; | |
85326fa5 DL |
1349 | unsigned int hash = fib_laddr_hashfn(local); |
1350 | struct hlist_head *head = &fib_info_laddrhash[hash]; | |
85326fa5 | 1351 | struct fib_info *fi; |
1da177e4 | 1352 | |
51456b29 | 1353 | if (!fib_info_laddrhash || local == 0) |
85326fa5 | 1354 | return 0; |
1da177e4 | 1355 | |
b67bfe0d | 1356 | hlist_for_each_entry(fi, head, fib_lhash) { |
09ad9bc7 | 1357 | if (!net_eq(fi->fib_net, net)) |
4814bdbd | 1358 | continue; |
85326fa5 DL |
1359 | if (fi->fib_prefsrc == local) { |
1360 | fi->fib_flags |= RTNH_F_DEAD; | |
1361 | ret++; | |
1da177e4 LT |
1362 | } |
1363 | } | |
85326fa5 DL |
1364 | return ret; |
1365 | } | |
1366 | ||
4f823def JA |
1367 | /* Event force Flags Description |
1368 | * NETDEV_CHANGE 0 LINKDOWN Carrier OFF, not for scope host | |
1369 | * NETDEV_DOWN 0 LINKDOWN|DEAD Link down, not for scope host | |
1370 | * NETDEV_DOWN 1 LINKDOWN|DEAD Last address removed | |
1371 | * NETDEV_UNREGISTER 1 LINKDOWN|DEAD Device removed | |
1372 | */ | |
1373 | int fib_sync_down_dev(struct net_device *dev, unsigned long event, bool force) | |
85326fa5 DL |
1374 | { |
1375 | int ret = 0; | |
1376 | int scope = RT_SCOPE_NOWHERE; | |
1377 | struct fib_info *prev_fi = NULL; | |
1378 | unsigned int hash = fib_devindex_hashfn(dev->ifindex); | |
1379 | struct hlist_head *head = &fib_info_devhash[hash]; | |
85326fa5 | 1380 | struct fib_nh *nh; |
1da177e4 | 1381 | |
4f823def | 1382 | if (force) |
85326fa5 | 1383 | scope = -1; |
1da177e4 | 1384 | |
b67bfe0d | 1385 | hlist_for_each_entry(nh, head, nh_hash) { |
85326fa5 DL |
1386 | struct fib_info *fi = nh->nh_parent; |
1387 | int dead; | |
1da177e4 | 1388 | |
85326fa5 DL |
1389 | BUG_ON(!fi->fib_nhs); |
1390 | if (nh->nh_dev != dev || fi == prev_fi) | |
1391 | continue; | |
1392 | prev_fi = fi; | |
1393 | dead = 0; | |
1394 | change_nexthops(fi) { | |
6a31d2a9 | 1395 | if (nexthop_nh->nh_flags & RTNH_F_DEAD) |
85326fa5 | 1396 | dead++; |
71fceff0 DM |
1397 | else if (nexthop_nh->nh_dev == dev && |
1398 | nexthop_nh->nh_scope != scope) { | |
8a3d0316 AG |
1399 | switch (event) { |
1400 | case NETDEV_DOWN: | |
1401 | case NETDEV_UNREGISTER: | |
1402 | nexthop_nh->nh_flags |= RTNH_F_DEAD; | |
1403 | /* fall through */ | |
1404 | case NETDEV_CHANGE: | |
1405 | nexthop_nh->nh_flags |= RTNH_F_LINKDOWN; | |
1406 | break; | |
1407 | } | |
85326fa5 DL |
1408 | dead++; |
1409 | } | |
1da177e4 | 1410 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
8a3d0316 AG |
1411 | if (event == NETDEV_UNREGISTER && |
1412 | nexthop_nh->nh_dev == dev) { | |
85326fa5 DL |
1413 | dead = fi->fib_nhs; |
1414 | break; | |
1da177e4 | 1415 | } |
85326fa5 DL |
1416 | #endif |
1417 | } endfor_nexthops(fi) | |
1418 | if (dead == fi->fib_nhs) { | |
8a3d0316 AG |
1419 | switch (event) { |
1420 | case NETDEV_DOWN: | |
1421 | case NETDEV_UNREGISTER: | |
1422 | fi->fib_flags |= RTNH_F_DEAD; | |
1423 | /* fall through */ | |
1424 | case NETDEV_CHANGE: | |
1425 | fi->fib_flags |= RTNH_F_LINKDOWN; | |
1426 | break; | |
1427 | } | |
85326fa5 | 1428 | ret++; |
1da177e4 | 1429 | } |
0e884c78 PN |
1430 | |
1431 | fib_rebalance(fi); | |
1da177e4 LT |
1432 | } |
1433 | ||
1434 | return ret; | |
1435 | } | |
1436 | ||
0c838ff1 | 1437 | /* Must be invoked inside of an RCU protected region. */ |
2392debc | 1438 | void fib_select_default(const struct flowi4 *flp, struct fib_result *res) |
0c838ff1 DM |
1439 | { |
1440 | struct fib_info *fi = NULL, *last_resort = NULL; | |
56315f9e | 1441 | struct hlist_head *fa_head = res->fa_head; |
0c838ff1 | 1442 | struct fib_table *tb = res->table; |
18a912e9 | 1443 | u8 slen = 32 - res->prefixlen; |
0c838ff1 | 1444 | int order = -1, last_idx = -1; |
2392debc JA |
1445 | struct fib_alias *fa, *fa1 = NULL; |
1446 | u32 last_prio = res->fi->fib_priority; | |
1447 | u8 last_tos = 0; | |
0c838ff1 | 1448 | |
56315f9e | 1449 | hlist_for_each_entry_rcu(fa, fa_head, fa_list) { |
0c838ff1 DM |
1450 | struct fib_info *next_fi = fa->fa_info; |
1451 | ||
18a912e9 JA |
1452 | if (fa->fa_slen != slen) |
1453 | continue; | |
2392debc JA |
1454 | if (fa->fa_tos && fa->fa_tos != flp->flowi4_tos) |
1455 | continue; | |
18a912e9 JA |
1456 | if (fa->tb_id != tb->tb_id) |
1457 | continue; | |
2392debc JA |
1458 | if (next_fi->fib_priority > last_prio && |
1459 | fa->fa_tos == last_tos) { | |
1460 | if (last_tos) | |
1461 | continue; | |
1462 | break; | |
1463 | } | |
1464 | if (next_fi->fib_flags & RTNH_F_DEAD) | |
1465 | continue; | |
1466 | last_tos = fa->fa_tos; | |
1467 | last_prio = next_fi->fib_priority; | |
1468 | ||
37e826c5 | 1469 | if (next_fi->fib_scope != res->scope || |
0c838ff1 DM |
1470 | fa->fa_type != RTN_UNICAST) |
1471 | continue; | |
0c838ff1 DM |
1472 | if (!next_fi->fib_nh[0].nh_gw || |
1473 | next_fi->fib_nh[0].nh_scope != RT_SCOPE_LINK) | |
1474 | continue; | |
1475 | ||
1476 | fib_alias_accessed(fa); | |
1477 | ||
51456b29 | 1478 | if (!fi) { |
0c838ff1 DM |
1479 | if (next_fi != res->fi) |
1480 | break; | |
2392debc | 1481 | fa1 = fa; |
0c838ff1 | 1482 | } else if (!fib_detect_death(fi, order, &last_resort, |
2392debc | 1483 | &last_idx, fa1->fa_default)) { |
0c838ff1 | 1484 | fib_result_assign(res, fi); |
2392debc | 1485 | fa1->fa_default = order; |
0c838ff1 DM |
1486 | goto out; |
1487 | } | |
1488 | fi = next_fi; | |
1489 | order++; | |
1490 | } | |
1491 | ||
51456b29 | 1492 | if (order <= 0 || !fi) { |
2392debc JA |
1493 | if (fa1) |
1494 | fa1->fa_default = -1; | |
0c838ff1 DM |
1495 | goto out; |
1496 | } | |
1497 | ||
1498 | if (!fib_detect_death(fi, order, &last_resort, &last_idx, | |
2392debc | 1499 | fa1->fa_default)) { |
0c838ff1 | 1500 | fib_result_assign(res, fi); |
2392debc | 1501 | fa1->fa_default = order; |
0c838ff1 DM |
1502 | goto out; |
1503 | } | |
1504 | ||
1505 | if (last_idx >= 0) | |
1506 | fib_result_assign(res, last_resort); | |
2392debc | 1507 | fa1->fa_default = last_idx; |
0c838ff1 | 1508 | out: |
31d40937 | 1509 | return; |
0c838ff1 DM |
1510 | } |
1511 | ||
1da177e4 | 1512 | /* |
6a31d2a9 ED |
1513 | * Dead device goes up. We wake up dead nexthops. |
1514 | * It takes sense only on multipath routes. | |
1da177e4 | 1515 | */ |
8a3d0316 | 1516 | int fib_sync_up(struct net_device *dev, unsigned int nh_flags) |
1da177e4 LT |
1517 | { |
1518 | struct fib_info *prev_fi; | |
1519 | unsigned int hash; | |
1520 | struct hlist_head *head; | |
1da177e4 LT |
1521 | struct fib_nh *nh; |
1522 | int ret; | |
1523 | ||
6a31d2a9 | 1524 | if (!(dev->flags & IFF_UP)) |
1da177e4 LT |
1525 | return 0; |
1526 | ||
c9b3292e JA |
1527 | if (nh_flags & RTNH_F_DEAD) { |
1528 | unsigned int flags = dev_get_flags(dev); | |
1529 | ||
1530 | if (flags & (IFF_RUNNING | IFF_LOWER_UP)) | |
1531 | nh_flags |= RTNH_F_LINKDOWN; | |
1532 | } | |
1533 | ||
1da177e4 LT |
1534 | prev_fi = NULL; |
1535 | hash = fib_devindex_hashfn(dev->ifindex); | |
1536 | head = &fib_info_devhash[hash]; | |
1537 | ret = 0; | |
1538 | ||
b67bfe0d | 1539 | hlist_for_each_entry(nh, head, nh_hash) { |
1da177e4 LT |
1540 | struct fib_info *fi = nh->nh_parent; |
1541 | int alive; | |
1542 | ||
1543 | BUG_ON(!fi->fib_nhs); | |
1544 | if (nh->nh_dev != dev || fi == prev_fi) | |
1545 | continue; | |
1546 | ||
1547 | prev_fi = fi; | |
1548 | alive = 0; | |
1549 | change_nexthops(fi) { | |
8a3d0316 | 1550 | if (!(nexthop_nh->nh_flags & nh_flags)) { |
1da177e4 LT |
1551 | alive++; |
1552 | continue; | |
1553 | } | |
51456b29 | 1554 | if (!nexthop_nh->nh_dev || |
6a31d2a9 | 1555 | !(nexthop_nh->nh_dev->flags & IFF_UP)) |
1da177e4 | 1556 | continue; |
71fceff0 DM |
1557 | if (nexthop_nh->nh_dev != dev || |
1558 | !__in_dev_get_rtnl(dev)) | |
1da177e4 LT |
1559 | continue; |
1560 | alive++; | |
8a3d0316 | 1561 | nexthop_nh->nh_flags &= ~nh_flags; |
1da177e4 LT |
1562 | } endfor_nexthops(fi) |
1563 | ||
1564 | if (alive > 0) { | |
8a3d0316 | 1565 | fi->fib_flags &= ~nh_flags; |
1da177e4 LT |
1566 | ret++; |
1567 | } | |
0e884c78 PN |
1568 | |
1569 | fib_rebalance(fi); | |
1da177e4 LT |
1570 | } |
1571 | ||
1572 | return ret; | |
1573 | } | |
1574 | ||
8a3d0316 AG |
1575 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
1576 | ||
0e884c78 | 1577 | void fib_select_multipath(struct fib_result *res, int hash) |
1da177e4 LT |
1578 | { |
1579 | struct fib_info *fi = res->fi; | |
1da177e4 | 1580 | |
0e884c78 PN |
1581 | for_nexthops(fi) { |
1582 | if (hash > atomic_read(&nh->nh_upper_bound)) | |
1583 | continue; | |
1da177e4 | 1584 | |
0e884c78 PN |
1585 | res->nh_sel = nhsel; |
1586 | return; | |
1da177e4 LT |
1587 | } endfor_nexthops(fi); |
1588 | ||
1589 | /* Race condition: route has just become dead. */ | |
1590 | res->nh_sel = 0; | |
1da177e4 LT |
1591 | } |
1592 | #endif | |
3ce58d84 DA |
1593 | |
1594 | void fib_select_path(struct net *net, struct fib_result *res, | |
1595 | struct flowi4 *fl4, int mp_hash) | |
1596 | { | |
c177d491 DA |
1597 | bool oif_check; |
1598 | ||
1599 | oif_check = (fl4->flowi4_oif == 0 || | |
1600 | fl4->flowi4_flags & FLOWI_FLAG_SKIP_NH_OIF); | |
1601 | ||
3ce58d84 | 1602 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
c177d491 | 1603 | if (res->fi->fib_nhs > 1 && oif_check) { |
3ce58d84 | 1604 | if (mp_hash < 0) |
9920e48b PA |
1605 | mp_hash = get_hash_from_flowi4(fl4) >> 1; |
1606 | ||
3ce58d84 DA |
1607 | fib_select_multipath(res, mp_hash); |
1608 | } | |
1609 | else | |
1610 | #endif | |
1611 | if (!res->prefixlen && | |
1612 | res->table->tb_num_default > 1 && | |
c177d491 | 1613 | res->type == RTN_UNICAST && oif_check) |
3ce58d84 DA |
1614 | fib_select_default(fl4, res); |
1615 | ||
1616 | if (!fl4->saddr) | |
1617 | fl4->saddr = FIB_RES_PREFSRC(net, *res); | |
1618 | } | |
1619 | EXPORT_SYMBOL_GPL(fib_select_path); |