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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
3 | * operating system. INET is implemented using the BSD Socket | |
4 | * interface as the means of communication with the user level. | |
5 | * | |
6 | * IPv4 Forwarding Information Base: 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 | ||
7c0f6ba6 | 16 | #include <linux/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); | |
207 | ||
e49cc0da YZ |
208 | change_nexthops(fi) { |
209 | if (nexthop_nh->nh_dev) | |
210 | dev_put(nexthop_nh->nh_dev); | |
5a6228a0 | 211 | lwtstate_put(nexthop_nh->nh_lwtstate); |
caa41527 | 212 | free_nh_exceptions(nexthop_nh); |
c5038a83 DM |
213 | rt_fibinfo_free_cpus(nexthop_nh->nh_pcpu_rth_output); |
214 | rt_fibinfo_free(&nexthop_nh->nh_rth_input); | |
e49cc0da YZ |
215 | } endfor_nexthops(fi); |
216 | ||
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 | 236 | } |
b423cb10 | 237 | EXPORT_SYMBOL_GPL(free_fib_info); |
1da177e4 LT |
238 | |
239 | void fib_release_info(struct fib_info *fi) | |
240 | { | |
832b4c5e | 241 | spin_lock_bh(&fib_info_lock); |
1da177e4 LT |
242 | if (fi && --fi->fib_treeref == 0) { |
243 | hlist_del(&fi->fib_hash); | |
244 | if (fi->fib_prefsrc) | |
245 | hlist_del(&fi->fib_lhash); | |
246 | change_nexthops(fi) { | |
71fceff0 | 247 | if (!nexthop_nh->nh_dev) |
1da177e4 | 248 | continue; |
71fceff0 | 249 | hlist_del(&nexthop_nh->nh_hash); |
1da177e4 LT |
250 | } endfor_nexthops(fi) |
251 | fi->fib_dead = 1; | |
252 | fib_info_put(fi); | |
253 | } | |
832b4c5e | 254 | spin_unlock_bh(&fib_info_lock); |
1da177e4 LT |
255 | } |
256 | ||
6a31d2a9 | 257 | static inline int nh_comp(const struct fib_info *fi, const struct fib_info *ofi) |
1da177e4 LT |
258 | { |
259 | const struct fib_nh *onh = ofi->fib_nh; | |
260 | ||
261 | for_nexthops(fi) { | |
262 | if (nh->nh_oif != onh->nh_oif || | |
263 | nh->nh_gw != onh->nh_gw || | |
264 | nh->nh_scope != onh->nh_scope || | |
265 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
266 | nh->nh_weight != onh->nh_weight || | |
267 | #endif | |
c7066f70 | 268 | #ifdef CONFIG_IP_ROUTE_CLASSID |
1da177e4 LT |
269 | nh->nh_tclassid != onh->nh_tclassid || |
270 | #endif | |
571e7226 | 271 | lwtunnel_cmp_encap(nh->nh_lwtstate, onh->nh_lwtstate) || |
8a3d0316 | 272 | ((nh->nh_flags ^ onh->nh_flags) & ~RTNH_COMPARE_MASK)) |
1da177e4 LT |
273 | return -1; |
274 | onh++; | |
275 | } endfor_nexthops(fi); | |
276 | return 0; | |
277 | } | |
278 | ||
88ebc72f DM |
279 | static inline unsigned int fib_devindex_hashfn(unsigned int val) |
280 | { | |
281 | unsigned int mask = DEVINDEX_HASHSIZE - 1; | |
282 | ||
283 | return (val ^ | |
284 | (val >> DEVINDEX_HASHBITS) ^ | |
285 | (val >> (DEVINDEX_HASHBITS * 2))) & mask; | |
286 | } | |
287 | ||
1da177e4 LT |
288 | static inline unsigned int fib_info_hashfn(const struct fib_info *fi) |
289 | { | |
123b9731 | 290 | unsigned int mask = (fib_info_hash_size - 1); |
1da177e4 LT |
291 | unsigned int val = fi->fib_nhs; |
292 | ||
37e826c5 | 293 | val ^= (fi->fib_protocol << 8) | fi->fib_scope; |
81f7bf6c | 294 | val ^= (__force u32)fi->fib_prefsrc; |
1da177e4 | 295 | val ^= fi->fib_priority; |
88ebc72f DM |
296 | for_nexthops(fi) { |
297 | val ^= fib_devindex_hashfn(nh->nh_oif); | |
298 | } endfor_nexthops(fi) | |
1da177e4 LT |
299 | |
300 | return (val ^ (val >> 7) ^ (val >> 12)) & mask; | |
301 | } | |
302 | ||
303 | static struct fib_info *fib_find_info(const struct fib_info *nfi) | |
304 | { | |
305 | struct hlist_head *head; | |
1da177e4 LT |
306 | struct fib_info *fi; |
307 | unsigned int hash; | |
308 | ||
309 | hash = fib_info_hashfn(nfi); | |
310 | head = &fib_info_hash[hash]; | |
311 | ||
b67bfe0d | 312 | hlist_for_each_entry(fi, head, fib_hash) { |
09ad9bc7 | 313 | if (!net_eq(fi->fib_net, nfi->fib_net)) |
4814bdbd | 314 | continue; |
1da177e4 LT |
315 | if (fi->fib_nhs != nfi->fib_nhs) |
316 | continue; | |
317 | if (nfi->fib_protocol == fi->fib_protocol && | |
37e826c5 | 318 | nfi->fib_scope == fi->fib_scope && |
1da177e4 LT |
319 | nfi->fib_prefsrc == fi->fib_prefsrc && |
320 | nfi->fib_priority == fi->fib_priority && | |
f4ef85bb | 321 | nfi->fib_type == fi->fib_type && |
1da177e4 | 322 | memcmp(nfi->fib_metrics, fi->fib_metrics, |
fcd13f42 | 323 | sizeof(u32) * RTAX_MAX) == 0 && |
8a3d0316 | 324 | !((nfi->fib_flags ^ fi->fib_flags) & ~RTNH_COMPARE_MASK) && |
1da177e4 LT |
325 | (nfi->fib_nhs == 0 || nh_comp(fi, nfi) == 0)) |
326 | return fi; | |
327 | } | |
328 | ||
329 | return NULL; | |
330 | } | |
331 | ||
1da177e4 | 332 | /* Check, that the gateway is already configured. |
6a31d2a9 | 333 | * Used only by redirect accept routine. |
1da177e4 | 334 | */ |
d878e72e | 335 | int ip_fib_check_default(__be32 gw, struct net_device *dev) |
1da177e4 LT |
336 | { |
337 | struct hlist_head *head; | |
1da177e4 LT |
338 | struct fib_nh *nh; |
339 | unsigned int hash; | |
340 | ||
832b4c5e | 341 | spin_lock(&fib_info_lock); |
1da177e4 LT |
342 | |
343 | hash = fib_devindex_hashfn(dev->ifindex); | |
344 | head = &fib_info_devhash[hash]; | |
b67bfe0d | 345 | hlist_for_each_entry(nh, head, nh_hash) { |
1da177e4 LT |
346 | if (nh->nh_dev == dev && |
347 | nh->nh_gw == gw && | |
6a31d2a9 | 348 | !(nh->nh_flags & RTNH_F_DEAD)) { |
832b4c5e | 349 | spin_unlock(&fib_info_lock); |
1da177e4 LT |
350 | return 0; |
351 | } | |
352 | } | |
353 | ||
832b4c5e | 354 | spin_unlock(&fib_info_lock); |
1da177e4 LT |
355 | |
356 | return -1; | |
357 | } | |
358 | ||
339bf98f TG |
359 | static inline size_t fib_nlmsg_size(struct fib_info *fi) |
360 | { | |
361 | size_t payload = NLMSG_ALIGN(sizeof(struct rtmsg)) | |
362 | + nla_total_size(4) /* RTA_TABLE */ | |
363 | + nla_total_size(4) /* RTA_DST */ | |
364 | + nla_total_size(4) /* RTA_PRIORITY */ | |
ea697639 DB |
365 | + nla_total_size(4) /* RTA_PREFSRC */ |
366 | + nla_total_size(TCP_CA_NAME_MAX); /* RTAX_CC_ALGO */ | |
339bf98f TG |
367 | |
368 | /* space for nested metrics */ | |
369 | payload += nla_total_size((RTAX_MAX * nla_total_size(4))); | |
370 | ||
371 | if (fi->fib_nhs) { | |
571e7226 | 372 | size_t nh_encapsize = 0; |
339bf98f TG |
373 | /* Also handles the special case fib_nhs == 1 */ |
374 | ||
375 | /* each nexthop is packed in an attribute */ | |
376 | size_t nhsize = nla_total_size(sizeof(struct rtnexthop)); | |
377 | ||
378 | /* may contain flow and gateway attribute */ | |
379 | nhsize += 2 * nla_total_size(4); | |
380 | ||
571e7226 RP |
381 | /* grab encap info */ |
382 | for_nexthops(fi) { | |
383 | if (nh->nh_lwtstate) { | |
384 | /* RTA_ENCAP_TYPE */ | |
385 | nh_encapsize += lwtunnel_get_encap_size( | |
386 | nh->nh_lwtstate); | |
387 | /* RTA_ENCAP */ | |
388 | nh_encapsize += nla_total_size(2); | |
389 | } | |
390 | } endfor_nexthops(fi); | |
391 | ||
339bf98f | 392 | /* all nexthops are packed in a nested attribute */ |
571e7226 RP |
393 | payload += nla_total_size((fi->fib_nhs * nhsize) + |
394 | nh_encapsize); | |
395 | ||
339bf98f TG |
396 | } |
397 | ||
398 | return payload; | |
399 | } | |
400 | ||
81f7bf6c | 401 | void rtmsg_fib(int event, __be32 key, struct fib_alias *fa, |
9877b253 | 402 | int dst_len, u32 tb_id, const struct nl_info *info, |
b8f55831 | 403 | unsigned int nlm_flags) |
1da177e4 LT |
404 | { |
405 | struct sk_buff *skb; | |
4e902c57 | 406 | u32 seq = info->nlh ? info->nlh->nlmsg_seq : 0; |
f21c7bc5 | 407 | int err = -ENOBUFS; |
1da177e4 | 408 | |
339bf98f | 409 | skb = nlmsg_new(fib_nlmsg_size(fa->fa_info), GFP_KERNEL); |
51456b29 | 410 | if (!skb) |
f21c7bc5 | 411 | goto errout; |
1da177e4 | 412 | |
15e47304 | 413 | err = fib_dump_info(skb, info->portid, seq, event, tb_id, |
37e826c5 | 414 | fa->fa_type, key, dst_len, |
b8f55831 | 415 | fa->fa_tos, fa->fa_info, nlm_flags); |
26932566 PM |
416 | if (err < 0) { |
417 | /* -EMSGSIZE implies BUG in fib_nlmsg_size() */ | |
418 | WARN_ON(err == -EMSGSIZE); | |
419 | kfree_skb(skb); | |
420 | goto errout; | |
421 | } | |
15e47304 | 422 | rtnl_notify(skb, info->nl_net, info->portid, RTNLGRP_IPV4_ROUTE, |
1ce85fe4 PNA |
423 | info->nlh, GFP_KERNEL); |
424 | return; | |
f21c7bc5 TG |
425 | errout: |
426 | if (err < 0) | |
4d1169c1 | 427 | rtnl_set_sk_err(info->nl_net, RTNLGRP_IPV4_ROUTE, err); |
1da177e4 LT |
428 | } |
429 | ||
c9cb6b6e SH |
430 | static int fib_detect_death(struct fib_info *fi, int order, |
431 | struct fib_info **last_resort, int *last_idx, | |
432 | int dflt) | |
1da177e4 LT |
433 | { |
434 | struct neighbour *n; | |
435 | int state = NUD_NONE; | |
436 | ||
437 | n = neigh_lookup(&arp_tbl, &fi->fib_nh[0].nh_gw, fi->fib_dev); | |
438 | if (n) { | |
439 | state = n->nud_state; | |
440 | neigh_release(n); | |
88f64320 JA |
441 | } else { |
442 | return 0; | |
1da177e4 | 443 | } |
d9319100 | 444 | if (state == NUD_REACHABLE) |
1da177e4 | 445 | return 0; |
6a31d2a9 | 446 | if ((state & NUD_VALID) && order != dflt) |
1da177e4 | 447 | return 0; |
6a31d2a9 | 448 | if ((state & NUD_VALID) || |
88f64320 | 449 | (*last_idx < 0 && order > dflt && state != NUD_INCOMPLETE)) { |
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 | { |
571e7226 RP |
474 | int ret; |
475 | ||
1da177e4 | 476 | change_nexthops(fi) { |
4e902c57 TG |
477 | int attrlen; |
478 | ||
479 | if (!rtnh_ok(rtnh, remaining)) | |
1da177e4 | 480 | return -EINVAL; |
4e902c57 | 481 | |
80610229 JA |
482 | if (rtnh->rtnh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)) |
483 | return -EINVAL; | |
484 | ||
71fceff0 DM |
485 | nexthop_nh->nh_flags = |
486 | (cfg->fc_flags & ~0xFF) | rtnh->rtnh_flags; | |
487 | nexthop_nh->nh_oif = rtnh->rtnh_ifindex; | |
488 | nexthop_nh->nh_weight = rtnh->rtnh_hops + 1; | |
4e902c57 TG |
489 | |
490 | attrlen = rtnh_attrlen(rtnh); | |
491 | if (attrlen > 0) { | |
492 | struct nlattr *nla, *attrs = rtnh_attrs(rtnh); | |
493 | ||
494 | nla = nla_find(attrs, attrlen, RTA_GATEWAY); | |
67b61f6c | 495 | nexthop_nh->nh_gw = nla ? nla_get_in_addr(nla) : 0; |
c7066f70 | 496 | #ifdef CONFIG_IP_ROUTE_CLASSID |
4e902c57 | 497 | nla = nla_find(attrs, attrlen, RTA_FLOW); |
71fceff0 | 498 | nexthop_nh->nh_tclassid = nla ? nla_get_u32(nla) : 0; |
7a9bc9b8 | 499 | if (nexthop_nh->nh_tclassid) |
f4530fa5 | 500 | fi->fib_net->ipv4.fib_num_tclassid_users++; |
1da177e4 | 501 | #endif |
571e7226 RP |
502 | nla = nla_find(attrs, attrlen, RTA_ENCAP); |
503 | if (nla) { | |
504 | struct lwtunnel_state *lwtstate; | |
571e7226 RP |
505 | struct nlattr *nla_entype; |
506 | ||
507 | nla_entype = nla_find(attrs, attrlen, | |
508 | RTA_ENCAP_TYPE); | |
509 | if (!nla_entype) | |
510 | goto err_inval; | |
30357d7d DA |
511 | |
512 | ret = lwtunnel_build_state(nla_get_u16( | |
571e7226 | 513 | nla_entype), |
127eb7cd TH |
514 | nla, AF_INET, cfg, |
515 | &lwtstate); | |
571e7226 RP |
516 | if (ret) |
517 | goto errout; | |
5a6228a0 ND |
518 | nexthop_nh->nh_lwtstate = |
519 | lwtstate_get(lwtstate); | |
571e7226 | 520 | } |
1da177e4 | 521 | } |
4e902c57 TG |
522 | |
523 | rtnh = rtnh_next(rtnh, &remaining); | |
1da177e4 | 524 | } endfor_nexthops(fi); |
4e902c57 | 525 | |
1da177e4 | 526 | return 0; |
571e7226 RP |
527 | |
528 | err_inval: | |
529 | ret = -EINVAL; | |
530 | ||
531 | errout: | |
532 | return ret; | |
1da177e4 LT |
533 | } |
534 | ||
0e884c78 PN |
535 | static void fib_rebalance(struct fib_info *fi) |
536 | { | |
537 | int total; | |
538 | int w; | |
539 | struct in_device *in_dev; | |
540 | ||
541 | if (fi->fib_nhs < 2) | |
542 | return; | |
543 | ||
544 | total = 0; | |
545 | for_nexthops(fi) { | |
546 | if (nh->nh_flags & RTNH_F_DEAD) | |
547 | continue; | |
548 | ||
51161aa9 | 549 | in_dev = __in_dev_get_rtnl(nh->nh_dev); |
0e884c78 PN |
550 | |
551 | if (in_dev && | |
552 | IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev) && | |
553 | nh->nh_flags & RTNH_F_LINKDOWN) | |
554 | continue; | |
555 | ||
556 | total += nh->nh_weight; | |
557 | } endfor_nexthops(fi); | |
558 | ||
559 | w = 0; | |
560 | change_nexthops(fi) { | |
561 | int upper_bound; | |
562 | ||
51161aa9 | 563 | in_dev = __in_dev_get_rtnl(nexthop_nh->nh_dev); |
0e884c78 PN |
564 | |
565 | if (nexthop_nh->nh_flags & RTNH_F_DEAD) { | |
566 | upper_bound = -1; | |
567 | } else if (in_dev && | |
568 | IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev) && | |
569 | nexthop_nh->nh_flags & RTNH_F_LINKDOWN) { | |
570 | upper_bound = -1; | |
571 | } else { | |
572 | w += nexthop_nh->nh_weight; | |
0a837fe4 PN |
573 | upper_bound = DIV_ROUND_CLOSEST_ULL((u64)w << 31, |
574 | total) - 1; | |
0e884c78 PN |
575 | } |
576 | ||
577 | atomic_set(&nexthop_nh->nh_upper_bound, upper_bound); | |
578 | } endfor_nexthops(fi); | |
579 | ||
580 | net_get_random_once(&fib_multipath_secret, | |
581 | sizeof(fib_multipath_secret)); | |
582 | } | |
583 | ||
584 | static inline void fib_add_weight(struct fib_info *fi, | |
585 | const struct fib_nh *nh) | |
586 | { | |
587 | fi->fib_weight += nh->nh_weight; | |
588 | } | |
589 | ||
590 | #else /* CONFIG_IP_ROUTE_MULTIPATH */ | |
591 | ||
592 | #define fib_rebalance(fi) do { } while (0) | |
593 | #define fib_add_weight(fi, nh) do { } while (0) | |
594 | ||
595 | #endif /* CONFIG_IP_ROUTE_MULTIPATH */ | |
1da177e4 | 596 | |
30357d7d | 597 | static int fib_encap_match(u16 encap_type, |
e01286ef | 598 | struct nlattr *encap, |
30357d7d | 599 | const struct fib_nh *nh, |
127eb7cd | 600 | const struct fib_config *cfg) |
571e7226 RP |
601 | { |
602 | struct lwtunnel_state *lwtstate; | |
df383e62 | 603 | int ret, result = 0; |
571e7226 RP |
604 | |
605 | if (encap_type == LWTUNNEL_ENCAP_NONE) | |
606 | return 0; | |
607 | ||
30357d7d | 608 | ret = lwtunnel_build_state(encap_type, encap, |
127eb7cd | 609 | AF_INET, cfg, &lwtstate); |
df383e62 JB |
610 | if (!ret) { |
611 | result = lwtunnel_cmp_encap(lwtstate, nh->nh_lwtstate); | |
612 | lwtstate_free(lwtstate); | |
613 | } | |
571e7226 | 614 | |
df383e62 | 615 | return result; |
571e7226 RP |
616 | } |
617 | ||
4e902c57 | 618 | int fib_nh_match(struct fib_config *cfg, struct fib_info *fi) |
1da177e4 LT |
619 | { |
620 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
4e902c57 TG |
621 | struct rtnexthop *rtnh; |
622 | int remaining; | |
1da177e4 LT |
623 | #endif |
624 | ||
4e902c57 | 625 | if (cfg->fc_priority && cfg->fc_priority != fi->fib_priority) |
1da177e4 LT |
626 | return 1; |
627 | ||
4e902c57 | 628 | if (cfg->fc_oif || cfg->fc_gw) { |
571e7226 | 629 | if (cfg->fc_encap) { |
30357d7d DA |
630 | if (fib_encap_match(cfg->fc_encap_type, |
631 | cfg->fc_encap, fi->fib_nh, cfg)) | |
571e7226 RP |
632 | return 1; |
633 | } | |
4e902c57 TG |
634 | if ((!cfg->fc_oif || cfg->fc_oif == fi->fib_nh->nh_oif) && |
635 | (!cfg->fc_gw || cfg->fc_gw == fi->fib_nh->nh_gw)) | |
1da177e4 LT |
636 | return 0; |
637 | return 1; | |
638 | } | |
639 | ||
640 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
51456b29 | 641 | if (!cfg->fc_mp) |
1da177e4 | 642 | return 0; |
4e902c57 TG |
643 | |
644 | rtnh = cfg->fc_mp; | |
645 | remaining = cfg->fc_mp_len; | |
e905a9ed | 646 | |
1da177e4 | 647 | for_nexthops(fi) { |
4e902c57 | 648 | int attrlen; |
1da177e4 | 649 | |
4e902c57 | 650 | if (!rtnh_ok(rtnh, remaining)) |
1da177e4 | 651 | return -EINVAL; |
4e902c57 TG |
652 | |
653 | if (rtnh->rtnh_ifindex && rtnh->rtnh_ifindex != nh->nh_oif) | |
1da177e4 | 654 | return 1; |
4e902c57 TG |
655 | |
656 | attrlen = rtnh_attrlen(rtnh); | |
f76936d0 | 657 | if (attrlen > 0) { |
4e902c57 TG |
658 | struct nlattr *nla, *attrs = rtnh_attrs(rtnh); |
659 | ||
660 | nla = nla_find(attrs, attrlen, RTA_GATEWAY); | |
67b61f6c | 661 | if (nla && nla_get_in_addr(nla) != nh->nh_gw) |
1da177e4 | 662 | return 1; |
c7066f70 | 663 | #ifdef CONFIG_IP_ROUTE_CLASSID |
4e902c57 TG |
664 | nla = nla_find(attrs, attrlen, RTA_FLOW); |
665 | if (nla && nla_get_u32(nla) != nh->nh_tclassid) | |
1da177e4 LT |
666 | return 1; |
667 | #endif | |
668 | } | |
4e902c57 TG |
669 | |
670 | rtnh = rtnh_next(rtnh, &remaining); | |
1da177e4 LT |
671 | } endfor_nexthops(fi); |
672 | #endif | |
673 | return 0; | |
674 | } | |
675 | ||
676 | ||
677 | /* | |
6a31d2a9 ED |
678 | * Picture |
679 | * ------- | |
680 | * | |
681 | * Semantics of nexthop is very messy by historical reasons. | |
682 | * We have to take into account, that: | |
683 | * a) gateway can be actually local interface address, | |
684 | * so that gatewayed route is direct. | |
685 | * b) gateway must be on-link address, possibly | |
686 | * described not by an ifaddr, but also by a direct route. | |
687 | * c) If both gateway and interface are specified, they should not | |
688 | * contradict. | |
689 | * d) If we use tunnel routes, gateway could be not on-link. | |
690 | * | |
691 | * Attempt to reconcile all of these (alas, self-contradictory) conditions | |
692 | * results in pretty ugly and hairy code with obscure logic. | |
693 | * | |
694 | * I chose to generalized it instead, so that the size | |
695 | * of code does not increase practically, but it becomes | |
696 | * much more general. | |
697 | * Every prefix is assigned a "scope" value: "host" is local address, | |
698 | * "link" is direct route, | |
699 | * [ ... "site" ... "interior" ... ] | |
700 | * and "universe" is true gateway route with global meaning. | |
701 | * | |
702 | * Every prefix refers to a set of "nexthop"s (gw, oif), | |
703 | * where gw must have narrower scope. This recursion stops | |
704 | * when gw has LOCAL scope or if "nexthop" is declared ONLINK, | |
705 | * which means that gw is forced to be on link. | |
706 | * | |
707 | * Code is still hairy, but now it is apparently logically | |
708 | * consistent and very flexible. F.e. as by-product it allows | |
709 | * to co-exists in peace independent exterior and interior | |
710 | * routing processes. | |
711 | * | |
712 | * Normally it looks as following. | |
713 | * | |
714 | * {universe prefix} -> (gw, oif) [scope link] | |
715 | * | | |
716 | * |-> {link prefix} -> (gw, oif) [scope local] | |
717 | * | | |
718 | * |-> {local prefix} (terminal node) | |
1da177e4 | 719 | */ |
4e902c57 TG |
720 | static int fib_check_nh(struct fib_config *cfg, struct fib_info *fi, |
721 | struct fib_nh *nh) | |
1da177e4 | 722 | { |
127eb7cd | 723 | int err = 0; |
86167a37 | 724 | struct net *net; |
6a31d2a9 | 725 | struct net_device *dev; |
1da177e4 | 726 | |
86167a37 | 727 | net = cfg->fc_nlinfo.nl_net; |
1da177e4 LT |
728 | if (nh->nh_gw) { |
729 | struct fib_result res; | |
730 | ||
6a31d2a9 | 731 | if (nh->nh_flags & RTNH_F_ONLINK) { |
30bbaa19 | 732 | unsigned int addr_type; |
1da177e4 | 733 | |
4e902c57 | 734 | if (cfg->fc_scope >= RT_SCOPE_LINK) |
1da177e4 | 735 | return -EINVAL; |
6a31d2a9 ED |
736 | dev = __dev_get_by_index(net, nh->nh_oif); |
737 | if (!dev) | |
1da177e4 | 738 | return -ENODEV; |
6a31d2a9 | 739 | if (!(dev->flags & IFF_UP)) |
1da177e4 | 740 | return -ENETDOWN; |
30bbaa19 DA |
741 | addr_type = inet_addr_type_dev_table(net, dev, nh->nh_gw); |
742 | if (addr_type != RTN_UNICAST) | |
743 | return -EINVAL; | |
8a3d0316 AG |
744 | if (!netif_carrier_ok(dev)) |
745 | nh->nh_flags |= RTNH_F_LINKDOWN; | |
1da177e4 LT |
746 | nh->nh_dev = dev; |
747 | dev_hold(dev); | |
748 | nh->nh_scope = RT_SCOPE_LINK; | |
749 | return 0; | |
750 | } | |
ebc0ffae | 751 | rcu_read_lock(); |
1da177e4 | 752 | { |
3bfd8472 | 753 | struct fib_table *tbl = NULL; |
9ade2286 DM |
754 | struct flowi4 fl4 = { |
755 | .daddr = nh->nh_gw, | |
756 | .flowi4_scope = cfg->fc_scope + 1, | |
757 | .flowi4_oif = nh->nh_oif, | |
6a662719 | 758 | .flowi4_iif = LOOPBACK_IFINDEX, |
4e902c57 | 759 | }; |
1da177e4 LT |
760 | |
761 | /* It is not necessary, but requires a bit of thinking */ | |
9ade2286 DM |
762 | if (fl4.flowi4_scope < RT_SCOPE_LINK) |
763 | fl4.flowi4_scope = RT_SCOPE_LINK; | |
3bfd8472 DA |
764 | |
765 | if (cfg->fc_table) | |
766 | tbl = fib_get_table(net, cfg->fc_table); | |
767 | ||
768 | if (tbl) | |
769 | err = fib_table_lookup(tbl, &fl4, &res, | |
1e313678 ED |
770 | FIB_LOOKUP_IGNORE_LINKSTATE | |
771 | FIB_LOOKUP_NOREF); | |
4c9bcd11 DA |
772 | |
773 | /* on error or if no table given do full lookup. This | |
774 | * is needed for example when nexthops are in the local | |
775 | * table rather than the given table | |
776 | */ | |
777 | if (!tbl || err) { | |
3bfd8472 DA |
778 | err = fib_lookup(net, &fl4, &res, |
779 | FIB_LOOKUP_IGNORE_LINKSTATE); | |
4c9bcd11 DA |
780 | } |
781 | ||
ebc0ffae ED |
782 | if (err) { |
783 | rcu_read_unlock(); | |
1da177e4 | 784 | return err; |
ebc0ffae | 785 | } |
1da177e4 LT |
786 | } |
787 | err = -EINVAL; | |
788 | if (res.type != RTN_UNICAST && res.type != RTN_LOCAL) | |
789 | goto out; | |
790 | nh->nh_scope = res.scope; | |
791 | nh->nh_oif = FIB_RES_OIF(res); | |
6a31d2a9 ED |
792 | nh->nh_dev = dev = FIB_RES_DEV(res); |
793 | if (!dev) | |
1da177e4 | 794 | goto out; |
6a31d2a9 | 795 | dev_hold(dev); |
8a3d0316 AG |
796 | if (!netif_carrier_ok(dev)) |
797 | nh->nh_flags |= RTNH_F_LINKDOWN; | |
8723e1b4 | 798 | err = (dev->flags & IFF_UP) ? 0 : -ENETDOWN; |
1da177e4 LT |
799 | } else { |
800 | struct in_device *in_dev; | |
801 | ||
6a31d2a9 | 802 | if (nh->nh_flags & (RTNH_F_PERVASIVE | RTNH_F_ONLINK)) |
1da177e4 LT |
803 | return -EINVAL; |
804 | ||
8723e1b4 ED |
805 | rcu_read_lock(); |
806 | err = -ENODEV; | |
86167a37 | 807 | in_dev = inetdev_by_index(net, nh->nh_oif); |
51456b29 | 808 | if (!in_dev) |
8723e1b4 ED |
809 | goto out; |
810 | err = -ENETDOWN; | |
811 | if (!(in_dev->dev->flags & IFF_UP)) | |
812 | goto out; | |
1da177e4 LT |
813 | nh->nh_dev = in_dev->dev; |
814 | dev_hold(nh->nh_dev); | |
815 | nh->nh_scope = RT_SCOPE_HOST; | |
8a3d0316 AG |
816 | if (!netif_carrier_ok(nh->nh_dev)) |
817 | nh->nh_flags |= RTNH_F_LINKDOWN; | |
8723e1b4 | 818 | err = 0; |
1da177e4 | 819 | } |
8723e1b4 ED |
820 | out: |
821 | rcu_read_unlock(); | |
822 | return err; | |
1da177e4 LT |
823 | } |
824 | ||
81f7bf6c | 825 | static inline unsigned int fib_laddr_hashfn(__be32 val) |
1da177e4 | 826 | { |
123b9731 | 827 | unsigned int mask = (fib_info_hash_size - 1); |
1da177e4 | 828 | |
6a31d2a9 ED |
829 | return ((__force u32)val ^ |
830 | ((__force u32)val >> 7) ^ | |
831 | ((__force u32)val >> 14)) & mask; | |
1da177e4 LT |
832 | } |
833 | ||
123b9731 | 834 | static struct hlist_head *fib_info_hash_alloc(int bytes) |
1da177e4 LT |
835 | { |
836 | if (bytes <= PAGE_SIZE) | |
88f83491 | 837 | return kzalloc(bytes, GFP_KERNEL); |
1da177e4 LT |
838 | else |
839 | return (struct hlist_head *) | |
6a31d2a9 ED |
840 | __get_free_pages(GFP_KERNEL | __GFP_ZERO, |
841 | get_order(bytes)); | |
1da177e4 LT |
842 | } |
843 | ||
123b9731 | 844 | static void fib_info_hash_free(struct hlist_head *hash, int bytes) |
1da177e4 LT |
845 | { |
846 | if (!hash) | |
847 | return; | |
848 | ||
849 | if (bytes <= PAGE_SIZE) | |
850 | kfree(hash); | |
851 | else | |
852 | free_pages((unsigned long) hash, get_order(bytes)); | |
853 | } | |
854 | ||
123b9731 DM |
855 | static void fib_info_hash_move(struct hlist_head *new_info_hash, |
856 | struct hlist_head *new_laddrhash, | |
857 | unsigned int new_size) | |
1da177e4 | 858 | { |
b7656e7f | 859 | struct hlist_head *old_info_hash, *old_laddrhash; |
123b9731 | 860 | unsigned int old_size = fib_info_hash_size; |
b7656e7f | 861 | unsigned int i, bytes; |
1da177e4 | 862 | |
832b4c5e | 863 | spin_lock_bh(&fib_info_lock); |
b7656e7f DM |
864 | old_info_hash = fib_info_hash; |
865 | old_laddrhash = fib_info_laddrhash; | |
123b9731 | 866 | fib_info_hash_size = new_size; |
1da177e4 LT |
867 | |
868 | for (i = 0; i < old_size; i++) { | |
869 | struct hlist_head *head = &fib_info_hash[i]; | |
b67bfe0d | 870 | struct hlist_node *n; |
1da177e4 LT |
871 | struct fib_info *fi; |
872 | ||
b67bfe0d | 873 | hlist_for_each_entry_safe(fi, n, head, fib_hash) { |
1da177e4 LT |
874 | struct hlist_head *dest; |
875 | unsigned int new_hash; | |
876 | ||
1da177e4 LT |
877 | new_hash = fib_info_hashfn(fi); |
878 | dest = &new_info_hash[new_hash]; | |
879 | hlist_add_head(&fi->fib_hash, dest); | |
880 | } | |
881 | } | |
882 | fib_info_hash = new_info_hash; | |
883 | ||
884 | for (i = 0; i < old_size; i++) { | |
885 | struct hlist_head *lhead = &fib_info_laddrhash[i]; | |
b67bfe0d | 886 | struct hlist_node *n; |
1da177e4 LT |
887 | struct fib_info *fi; |
888 | ||
b67bfe0d | 889 | hlist_for_each_entry_safe(fi, n, lhead, fib_lhash) { |
1da177e4 LT |
890 | struct hlist_head *ldest; |
891 | unsigned int new_hash; | |
892 | ||
1da177e4 LT |
893 | new_hash = fib_laddr_hashfn(fi->fib_prefsrc); |
894 | ldest = &new_laddrhash[new_hash]; | |
895 | hlist_add_head(&fi->fib_lhash, ldest); | |
896 | } | |
897 | } | |
898 | fib_info_laddrhash = new_laddrhash; | |
899 | ||
832b4c5e | 900 | spin_unlock_bh(&fib_info_lock); |
b7656e7f DM |
901 | |
902 | bytes = old_size * sizeof(struct hlist_head *); | |
123b9731 DM |
903 | fib_info_hash_free(old_info_hash, bytes); |
904 | fib_info_hash_free(old_laddrhash, bytes); | |
1da177e4 LT |
905 | } |
906 | ||
436c3b66 DM |
907 | __be32 fib_info_update_nh_saddr(struct net *net, struct fib_nh *nh) |
908 | { | |
909 | nh->nh_saddr = inet_select_addr(nh->nh_dev, | |
910 | nh->nh_gw, | |
37e826c5 | 911 | nh->nh_parent->fib_scope); |
436c3b66 DM |
912 | nh->nh_saddr_genid = atomic_read(&net->ipv4.dev_addr_genid); |
913 | ||
914 | return nh->nh_saddr; | |
915 | } | |
916 | ||
021dd3b8 DA |
917 | static bool fib_valid_prefsrc(struct fib_config *cfg, __be32 fib_prefsrc) |
918 | { | |
919 | if (cfg->fc_type != RTN_LOCAL || !cfg->fc_dst || | |
920 | fib_prefsrc != cfg->fc_dst) { | |
9b8ff518 | 921 | u32 tb_id = cfg->fc_table; |
e1b8d903 | 922 | int rc; |
021dd3b8 DA |
923 | |
924 | if (tb_id == RT_TABLE_MAIN) | |
925 | tb_id = RT_TABLE_LOCAL; | |
926 | ||
e1b8d903 DA |
927 | rc = inet_addr_type_table(cfg->fc_nlinfo.nl_net, |
928 | fib_prefsrc, tb_id); | |
929 | ||
930 | if (rc != RTN_LOCAL && tb_id != RT_TABLE_LOCAL) { | |
931 | rc = inet_addr_type_table(cfg->fc_nlinfo.nl_net, | |
932 | fib_prefsrc, RT_TABLE_LOCAL); | |
021dd3b8 | 933 | } |
e1b8d903 DA |
934 | |
935 | if (rc != RTN_LOCAL) | |
936 | return false; | |
021dd3b8 DA |
937 | } |
938 | return true; | |
939 | } | |
940 | ||
6cf9dfd3 FW |
941 | static int |
942 | fib_convert_metrics(struct fib_info *fi, const struct fib_config *cfg) | |
943 | { | |
c3a8d947 | 944 | bool ecn_ca = false; |
6cf9dfd3 FW |
945 | struct nlattr *nla; |
946 | int remaining; | |
947 | ||
948 | if (!cfg->fc_mx) | |
949 | return 0; | |
950 | ||
951 | nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) { | |
952 | int type = nla_type(nla); | |
953 | u32 val; | |
954 | ||
955 | if (!type) | |
956 | continue; | |
957 | if (type > RTAX_MAX) | |
958 | return -EINVAL; | |
959 | ||
960 | if (type == RTAX_CC_ALGO) { | |
961 | char tmp[TCP_CA_NAME_MAX]; | |
962 | ||
963 | nla_strlcpy(tmp, nla, sizeof(tmp)); | |
c3a8d947 | 964 | val = tcp_ca_get_key_by_name(tmp, &ecn_ca); |
6cf9dfd3 FW |
965 | if (val == TCP_CA_UNSPEC) |
966 | return -EINVAL; | |
967 | } else { | |
968 | val = nla_get_u32(nla); | |
969 | } | |
970 | if (type == RTAX_ADVMSS && val > 65535 - 40) | |
971 | val = 65535 - 40; | |
972 | if (type == RTAX_MTU && val > 65535 - 15) | |
973 | val = 65535 - 15; | |
626abd59 PA |
974 | if (type == RTAX_HOPLIMIT && val > 255) |
975 | val = 255; | |
b8d3e416 DB |
976 | if (type == RTAX_FEATURES && (val & ~RTAX_FEATURE_MASK)) |
977 | return -EINVAL; | |
6cf9dfd3 FW |
978 | fi->fib_metrics[type - 1] = val; |
979 | } | |
980 | ||
c3a8d947 DB |
981 | if (ecn_ca) |
982 | fi->fib_metrics[RTAX_FEATURES - 1] |= DST_FEATURE_ECN_CA; | |
983 | ||
6cf9dfd3 FW |
984 | return 0; |
985 | } | |
986 | ||
4e902c57 | 987 | struct fib_info *fib_create_info(struct fib_config *cfg) |
1da177e4 LT |
988 | { |
989 | int err; | |
990 | struct fib_info *fi = NULL; | |
991 | struct fib_info *ofi; | |
1da177e4 | 992 | int nhs = 1; |
7462bd74 | 993 | struct net *net = cfg->fc_nlinfo.nl_net; |
1da177e4 | 994 | |
4c8237cd DM |
995 | if (cfg->fc_type > RTN_MAX) |
996 | goto err_inval; | |
997 | ||
1da177e4 | 998 | /* Fast check to catch the most weird cases */ |
4e902c57 | 999 | if (fib_props[cfg->fc_type].scope > cfg->fc_scope) |
1da177e4 LT |
1000 | goto err_inval; |
1001 | ||
80610229 JA |
1002 | if (cfg->fc_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)) |
1003 | goto err_inval; | |
1004 | ||
1da177e4 | 1005 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
4e902c57 TG |
1006 | if (cfg->fc_mp) { |
1007 | nhs = fib_count_nexthops(cfg->fc_mp, cfg->fc_mp_len); | |
1da177e4 LT |
1008 | if (nhs == 0) |
1009 | goto err_inval; | |
1010 | } | |
1011 | #endif | |
1da177e4 LT |
1012 | |
1013 | err = -ENOBUFS; | |
123b9731 DM |
1014 | if (fib_info_cnt >= fib_info_hash_size) { |
1015 | unsigned int new_size = fib_info_hash_size << 1; | |
1da177e4 LT |
1016 | struct hlist_head *new_info_hash; |
1017 | struct hlist_head *new_laddrhash; | |
1018 | unsigned int bytes; | |
1019 | ||
1020 | if (!new_size) | |
d94ce9b2 | 1021 | new_size = 16; |
1da177e4 | 1022 | bytes = new_size * sizeof(struct hlist_head *); |
123b9731 DM |
1023 | new_info_hash = fib_info_hash_alloc(bytes); |
1024 | new_laddrhash = fib_info_hash_alloc(bytes); | |
1da177e4 | 1025 | if (!new_info_hash || !new_laddrhash) { |
123b9731 DM |
1026 | fib_info_hash_free(new_info_hash, bytes); |
1027 | fib_info_hash_free(new_laddrhash, bytes); | |
88f83491 | 1028 | } else |
123b9731 | 1029 | fib_info_hash_move(new_info_hash, new_laddrhash, new_size); |
1da177e4 | 1030 | |
123b9731 | 1031 | if (!fib_info_hash_size) |
1da177e4 LT |
1032 | goto failure; |
1033 | } | |
1034 | ||
0da974f4 | 1035 | fi = kzalloc(sizeof(*fi)+nhs*sizeof(struct fib_nh), GFP_KERNEL); |
51456b29 | 1036 | if (!fi) |
1da177e4 | 1037 | goto failure; |
aeefa1ec | 1038 | fib_info_cnt++; |
725d1e1b DM |
1039 | if (cfg->fc_mx) { |
1040 | fi->fib_metrics = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL); | |
1041 | if (!fi->fib_metrics) | |
1042 | goto failure; | |
1043 | } else | |
1044 | fi->fib_metrics = (u32 *) dst_default_metrics; | |
1da177e4 | 1045 | |
efd7ef1c | 1046 | fi->fib_net = net; |
4e902c57 | 1047 | fi->fib_protocol = cfg->fc_protocol; |
37e826c5 | 1048 | fi->fib_scope = cfg->fc_scope; |
4e902c57 TG |
1049 | fi->fib_flags = cfg->fc_flags; |
1050 | fi->fib_priority = cfg->fc_priority; | |
1051 | fi->fib_prefsrc = cfg->fc_prefsrc; | |
f4ef85bb | 1052 | fi->fib_type = cfg->fc_type; |
5a56a0b3 | 1053 | fi->fib_tb_id = cfg->fc_table; |
1da177e4 LT |
1054 | |
1055 | fi->fib_nhs = nhs; | |
1056 | change_nexthops(fi) { | |
71fceff0 | 1057 | nexthop_nh->nh_parent = fi; |
d26b3a7c | 1058 | nexthop_nh->nh_pcpu_rth_output = alloc_percpu(struct rtable __rcu *); |
f8a17175 JA |
1059 | if (!nexthop_nh->nh_pcpu_rth_output) |
1060 | goto failure; | |
1da177e4 LT |
1061 | } endfor_nexthops(fi) |
1062 | ||
6cf9dfd3 FW |
1063 | err = fib_convert_metrics(fi, cfg); |
1064 | if (err) | |
1065 | goto failure; | |
1da177e4 | 1066 | |
4e902c57 | 1067 | if (cfg->fc_mp) { |
1da177e4 | 1068 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
4e902c57 TG |
1069 | err = fib_get_nhs(fi, cfg->fc_mp, cfg->fc_mp_len, cfg); |
1070 | if (err != 0) | |
1da177e4 | 1071 | goto failure; |
4e902c57 | 1072 | if (cfg->fc_oif && fi->fib_nh->nh_oif != cfg->fc_oif) |
1da177e4 | 1073 | goto err_inval; |
4e902c57 | 1074 | if (cfg->fc_gw && fi->fib_nh->nh_gw != cfg->fc_gw) |
1da177e4 | 1075 | goto err_inval; |
c7066f70 | 1076 | #ifdef CONFIG_IP_ROUTE_CLASSID |
4e902c57 | 1077 | if (cfg->fc_flow && fi->fib_nh->nh_tclassid != cfg->fc_flow) |
1da177e4 LT |
1078 | goto err_inval; |
1079 | #endif | |
1080 | #else | |
1081 | goto err_inval; | |
1082 | #endif | |
1083 | } else { | |
1084 | struct fib_nh *nh = fi->fib_nh; | |
4e902c57 | 1085 | |
571e7226 RP |
1086 | if (cfg->fc_encap) { |
1087 | struct lwtunnel_state *lwtstate; | |
571e7226 RP |
1088 | |
1089 | if (cfg->fc_encap_type == LWTUNNEL_ENCAP_NONE) | |
1090 | goto err_inval; | |
30357d7d | 1091 | err = lwtunnel_build_state(cfg->fc_encap_type, |
127eb7cd TH |
1092 | cfg->fc_encap, AF_INET, cfg, |
1093 | &lwtstate); | |
571e7226 RP |
1094 | if (err) |
1095 | goto failure; | |
1096 | ||
5a6228a0 | 1097 | nh->nh_lwtstate = lwtstate_get(lwtstate); |
571e7226 | 1098 | } |
4e902c57 TG |
1099 | nh->nh_oif = cfg->fc_oif; |
1100 | nh->nh_gw = cfg->fc_gw; | |
1101 | nh->nh_flags = cfg->fc_flags; | |
c7066f70 | 1102 | #ifdef CONFIG_IP_ROUTE_CLASSID |
4e902c57 | 1103 | nh->nh_tclassid = cfg->fc_flow; |
7a9bc9b8 | 1104 | if (nh->nh_tclassid) |
f4530fa5 | 1105 | fi->fib_net->ipv4.fib_num_tclassid_users++; |
1da177e4 | 1106 | #endif |
1da177e4 LT |
1107 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
1108 | nh->nh_weight = 1; | |
1109 | #endif | |
1110 | } | |
1111 | ||
4e902c57 TG |
1112 | if (fib_props[cfg->fc_type].error) { |
1113 | if (cfg->fc_gw || cfg->fc_oif || cfg->fc_mp) | |
1da177e4 LT |
1114 | goto err_inval; |
1115 | goto link_it; | |
4c8237cd DM |
1116 | } else { |
1117 | switch (cfg->fc_type) { | |
1118 | case RTN_UNICAST: | |
1119 | case RTN_LOCAL: | |
1120 | case RTN_BROADCAST: | |
1121 | case RTN_ANYCAST: | |
1122 | case RTN_MULTICAST: | |
1123 | break; | |
1124 | default: | |
1125 | goto err_inval; | |
1126 | } | |
1da177e4 LT |
1127 | } |
1128 | ||
4e902c57 | 1129 | if (cfg->fc_scope > RT_SCOPE_HOST) |
1da177e4 LT |
1130 | goto err_inval; |
1131 | ||
4e902c57 | 1132 | if (cfg->fc_scope == RT_SCOPE_HOST) { |
1da177e4 LT |
1133 | struct fib_nh *nh = fi->fib_nh; |
1134 | ||
1135 | /* Local address is added. */ | |
1136 | if (nhs != 1 || nh->nh_gw) | |
1137 | goto err_inval; | |
1138 | nh->nh_scope = RT_SCOPE_NOWHERE; | |
7462bd74 | 1139 | nh->nh_dev = dev_get_by_index(net, fi->fib_nh->nh_oif); |
1da177e4 | 1140 | err = -ENODEV; |
51456b29 | 1141 | if (!nh->nh_dev) |
1da177e4 LT |
1142 | goto failure; |
1143 | } else { | |
8a3d0316 AG |
1144 | int linkdown = 0; |
1145 | ||
1da177e4 | 1146 | change_nexthops(fi) { |
6a31d2a9 ED |
1147 | err = fib_check_nh(cfg, fi, nexthop_nh); |
1148 | if (err != 0) | |
1da177e4 | 1149 | goto failure; |
8a3d0316 AG |
1150 | if (nexthop_nh->nh_flags & RTNH_F_LINKDOWN) |
1151 | linkdown++; | |
1da177e4 | 1152 | } endfor_nexthops(fi) |
8a3d0316 AG |
1153 | if (linkdown == fi->fib_nhs) |
1154 | fi->fib_flags |= RTNH_F_LINKDOWN; | |
1da177e4 LT |
1155 | } |
1156 | ||
021dd3b8 DA |
1157 | if (fi->fib_prefsrc && !fib_valid_prefsrc(cfg, fi->fib_prefsrc)) |
1158 | goto err_inval; | |
1da177e4 | 1159 | |
1fc050a1 | 1160 | change_nexthops(fi) { |
436c3b66 | 1161 | fib_info_update_nh_saddr(net, nexthop_nh); |
0e884c78 | 1162 | fib_add_weight(fi, nexthop_nh); |
1fc050a1 DM |
1163 | } endfor_nexthops(fi) |
1164 | ||
0e884c78 PN |
1165 | fib_rebalance(fi); |
1166 | ||
1da177e4 | 1167 | link_it: |
6a31d2a9 ED |
1168 | ofi = fib_find_info(fi); |
1169 | if (ofi) { | |
1da177e4 LT |
1170 | fi->fib_dead = 1; |
1171 | free_fib_info(fi); | |
1172 | ofi->fib_treeref++; | |
1173 | return ofi; | |
1174 | } | |
1175 | ||
1176 | fi->fib_treeref++; | |
1177 | atomic_inc(&fi->fib_clntref); | |
832b4c5e | 1178 | spin_lock_bh(&fib_info_lock); |
1da177e4 LT |
1179 | hlist_add_head(&fi->fib_hash, |
1180 | &fib_info_hash[fib_info_hashfn(fi)]); | |
1181 | if (fi->fib_prefsrc) { | |
1182 | struct hlist_head *head; | |
1183 | ||
1184 | head = &fib_info_laddrhash[fib_laddr_hashfn(fi->fib_prefsrc)]; | |
1185 | hlist_add_head(&fi->fib_lhash, head); | |
1186 | } | |
1187 | change_nexthops(fi) { | |
1188 | struct hlist_head *head; | |
1189 | unsigned int hash; | |
1190 | ||
71fceff0 | 1191 | if (!nexthop_nh->nh_dev) |
1da177e4 | 1192 | continue; |
71fceff0 | 1193 | hash = fib_devindex_hashfn(nexthop_nh->nh_dev->ifindex); |
1da177e4 | 1194 | head = &fib_info_devhash[hash]; |
71fceff0 | 1195 | hlist_add_head(&nexthop_nh->nh_hash, head); |
1da177e4 | 1196 | } endfor_nexthops(fi) |
832b4c5e | 1197 | spin_unlock_bh(&fib_info_lock); |
1da177e4 LT |
1198 | return fi; |
1199 | ||
1200 | err_inval: | |
1201 | err = -EINVAL; | |
1202 | ||
1203 | failure: | |
e905a9ed | 1204 | if (fi) { |
1da177e4 LT |
1205 | fi->fib_dead = 1; |
1206 | free_fib_info(fi); | |
1207 | } | |
4e902c57 TG |
1208 | |
1209 | return ERR_PTR(err); | |
1da177e4 LT |
1210 | } |
1211 | ||
15e47304 | 1212 | int fib_dump_info(struct sk_buff *skb, u32 portid, u32 seq, int event, |
37e826c5 | 1213 | u32 tb_id, u8 type, __be32 dst, int dst_len, u8 tos, |
be403ea1 | 1214 | struct fib_info *fi, unsigned int flags) |
1da177e4 | 1215 | { |
be403ea1 | 1216 | struct nlmsghdr *nlh; |
1da177e4 | 1217 | struct rtmsg *rtm; |
1da177e4 | 1218 | |
15e47304 | 1219 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*rtm), flags); |
51456b29 | 1220 | if (!nlh) |
26932566 | 1221 | return -EMSGSIZE; |
be403ea1 TG |
1222 | |
1223 | rtm = nlmsg_data(nlh); | |
1da177e4 LT |
1224 | rtm->rtm_family = AF_INET; |
1225 | rtm->rtm_dst_len = dst_len; | |
1226 | rtm->rtm_src_len = 0; | |
1227 | rtm->rtm_tos = tos; | |
709772e6 KPO |
1228 | if (tb_id < 256) |
1229 | rtm->rtm_table = tb_id; | |
1230 | else | |
1231 | rtm->rtm_table = RT_TABLE_COMPAT; | |
f3756b79 DM |
1232 | if (nla_put_u32(skb, RTA_TABLE, tb_id)) |
1233 | goto nla_put_failure; | |
1da177e4 LT |
1234 | rtm->rtm_type = type; |
1235 | rtm->rtm_flags = fi->fib_flags; | |
37e826c5 | 1236 | rtm->rtm_scope = fi->fib_scope; |
1da177e4 | 1237 | rtm->rtm_protocol = fi->fib_protocol; |
be403ea1 | 1238 | |
f3756b79 | 1239 | if (rtm->rtm_dst_len && |
930345ea | 1240 | nla_put_in_addr(skb, RTA_DST, dst)) |
f3756b79 DM |
1241 | goto nla_put_failure; |
1242 | if (fi->fib_priority && | |
1243 | nla_put_u32(skb, RTA_PRIORITY, fi->fib_priority)) | |
1244 | goto nla_put_failure; | |
1da177e4 | 1245 | if (rtnetlink_put_metrics(skb, fi->fib_metrics) < 0) |
be403ea1 TG |
1246 | goto nla_put_failure; |
1247 | ||
f3756b79 | 1248 | if (fi->fib_prefsrc && |
930345ea | 1249 | nla_put_in_addr(skb, RTA_PREFSRC, fi->fib_prefsrc)) |
f3756b79 | 1250 | goto nla_put_failure; |
1da177e4 | 1251 | if (fi->fib_nhs == 1) { |
0eeb075f AG |
1252 | struct in_device *in_dev; |
1253 | ||
f3756b79 | 1254 | if (fi->fib_nh->nh_gw && |
930345ea | 1255 | nla_put_in_addr(skb, RTA_GATEWAY, fi->fib_nh->nh_gw)) |
f3756b79 DM |
1256 | goto nla_put_failure; |
1257 | if (fi->fib_nh->nh_oif && | |
1258 | nla_put_u32(skb, RTA_OIF, fi->fib_nh->nh_oif)) | |
1259 | goto nla_put_failure; | |
0eeb075f | 1260 | if (fi->fib_nh->nh_flags & RTNH_F_LINKDOWN) { |
96ac5cc9 | 1261 | in_dev = __in_dev_get_rtnl(fi->fib_nh->nh_dev); |
0eeb075f AG |
1262 | if (in_dev && |
1263 | IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev)) | |
1264 | rtm->rtm_flags |= RTNH_F_DEAD; | |
1265 | } | |
c7066f70 | 1266 | #ifdef CONFIG_IP_ROUTE_CLASSID |
f3756b79 DM |
1267 | if (fi->fib_nh[0].nh_tclassid && |
1268 | nla_put_u32(skb, RTA_FLOW, fi->fib_nh[0].nh_tclassid)) | |
1269 | goto nla_put_failure; | |
8265abc0 | 1270 | #endif |
ea7a8085 DA |
1271 | if (fi->fib_nh->nh_lwtstate && |
1272 | lwtunnel_fill_encap(skb, fi->fib_nh->nh_lwtstate) < 0) | |
1273 | goto nla_put_failure; | |
1da177e4 LT |
1274 | } |
1275 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
1276 | if (fi->fib_nhs > 1) { | |
be403ea1 TG |
1277 | struct rtnexthop *rtnh; |
1278 | struct nlattr *mp; | |
1279 | ||
1280 | mp = nla_nest_start(skb, RTA_MULTIPATH); | |
51456b29 | 1281 | if (!mp) |
be403ea1 | 1282 | goto nla_put_failure; |
1da177e4 LT |
1283 | |
1284 | for_nexthops(fi) { | |
0eeb075f AG |
1285 | struct in_device *in_dev; |
1286 | ||
be403ea1 | 1287 | rtnh = nla_reserve_nohdr(skb, sizeof(*rtnh)); |
51456b29 | 1288 | if (!rtnh) |
be403ea1 TG |
1289 | goto nla_put_failure; |
1290 | ||
1291 | rtnh->rtnh_flags = nh->nh_flags & 0xFF; | |
0eeb075f | 1292 | if (nh->nh_flags & RTNH_F_LINKDOWN) { |
96ac5cc9 | 1293 | in_dev = __in_dev_get_rtnl(nh->nh_dev); |
0eeb075f AG |
1294 | if (in_dev && |
1295 | IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev)) | |
1296 | rtnh->rtnh_flags |= RTNH_F_DEAD; | |
1297 | } | |
be403ea1 TG |
1298 | rtnh->rtnh_hops = nh->nh_weight - 1; |
1299 | rtnh->rtnh_ifindex = nh->nh_oif; | |
1300 | ||
f3756b79 | 1301 | if (nh->nh_gw && |
930345ea | 1302 | nla_put_in_addr(skb, RTA_GATEWAY, nh->nh_gw)) |
f3756b79 | 1303 | goto nla_put_failure; |
c7066f70 | 1304 | #ifdef CONFIG_IP_ROUTE_CLASSID |
f3756b79 DM |
1305 | if (nh->nh_tclassid && |
1306 | nla_put_u32(skb, RTA_FLOW, nh->nh_tclassid)) | |
1307 | goto nla_put_failure; | |
8265abc0 | 1308 | #endif |
ea7a8085 DA |
1309 | if (nh->nh_lwtstate && |
1310 | lwtunnel_fill_encap(skb, nh->nh_lwtstate) < 0) | |
1311 | goto nla_put_failure; | |
1312 | ||
be403ea1 TG |
1313 | /* length of rtnetlink header + attributes */ |
1314 | rtnh->rtnh_len = nlmsg_get_pos(skb) - (void *) rtnh; | |
1da177e4 | 1315 | } endfor_nexthops(fi); |
be403ea1 TG |
1316 | |
1317 | nla_nest_end(skb, mp); | |
1da177e4 LT |
1318 | } |
1319 | #endif | |
053c095a JB |
1320 | nlmsg_end(skb, nlh); |
1321 | return 0; | |
1da177e4 | 1322 | |
be403ea1 | 1323 | nla_put_failure: |
26932566 PM |
1324 | nlmsg_cancel(skb, nlh); |
1325 | return -EMSGSIZE; | |
1da177e4 LT |
1326 | } |
1327 | ||
1da177e4 | 1328 | /* |
6a31d2a9 ED |
1329 | * Update FIB if: |
1330 | * - local address disappeared -> we must delete all the entries | |
1331 | * referring to it. | |
1332 | * - device went down -> we must shutdown all nexthops going via it. | |
1da177e4 | 1333 | */ |
5a56a0b3 | 1334 | int fib_sync_down_addr(struct net_device *dev, __be32 local) |
1da177e4 LT |
1335 | { |
1336 | int ret = 0; | |
85326fa5 DL |
1337 | unsigned int hash = fib_laddr_hashfn(local); |
1338 | struct hlist_head *head = &fib_info_laddrhash[hash]; | |
5a56a0b3 MT |
1339 | struct net *net = dev_net(dev); |
1340 | int tb_id = l3mdev_fib_table(dev); | |
85326fa5 | 1341 | struct fib_info *fi; |
1da177e4 | 1342 | |
51456b29 | 1343 | if (!fib_info_laddrhash || local == 0) |
85326fa5 | 1344 | return 0; |
1da177e4 | 1345 | |
b67bfe0d | 1346 | hlist_for_each_entry(fi, head, fib_lhash) { |
5a56a0b3 MT |
1347 | if (!net_eq(fi->fib_net, net) || |
1348 | fi->fib_tb_id != tb_id) | |
4814bdbd | 1349 | continue; |
85326fa5 DL |
1350 | if (fi->fib_prefsrc == local) { |
1351 | fi->fib_flags |= RTNH_F_DEAD; | |
1352 | ret++; | |
1da177e4 LT |
1353 | } |
1354 | } | |
85326fa5 DL |
1355 | return ret; |
1356 | } | |
1357 | ||
982acb97 IS |
1358 | static int call_fib_nh_notifiers(struct fib_nh *fib_nh, |
1359 | enum fib_event_type event_type) | |
1360 | { | |
1361 | struct in_device *in_dev = __in_dev_get_rtnl(fib_nh->nh_dev); | |
1362 | struct fib_nh_notifier_info info = { | |
1363 | .fib_nh = fib_nh, | |
1364 | }; | |
1365 | ||
1366 | switch (event_type) { | |
1367 | case FIB_EVENT_NH_ADD: | |
1368 | if (fib_nh->nh_flags & RTNH_F_DEAD) | |
1369 | break; | |
1370 | if (IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev) && | |
1371 | fib_nh->nh_flags & RTNH_F_LINKDOWN) | |
1372 | break; | |
1373 | return call_fib_notifiers(dev_net(fib_nh->nh_dev), event_type, | |
1374 | &info.info); | |
1375 | case FIB_EVENT_NH_DEL: | |
1376 | if ((IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev) && | |
1377 | fib_nh->nh_flags & RTNH_F_LINKDOWN) || | |
1378 | (fib_nh->nh_flags & RTNH_F_DEAD)) | |
1379 | return call_fib_notifiers(dev_net(fib_nh->nh_dev), | |
1380 | event_type, &info.info); | |
1381 | default: | |
1382 | break; | |
1383 | } | |
1384 | ||
1385 | return NOTIFY_DONE; | |
1386 | } | |
1387 | ||
4f823def JA |
1388 | /* Event force Flags Description |
1389 | * NETDEV_CHANGE 0 LINKDOWN Carrier OFF, not for scope host | |
1390 | * NETDEV_DOWN 0 LINKDOWN|DEAD Link down, not for scope host | |
1391 | * NETDEV_DOWN 1 LINKDOWN|DEAD Last address removed | |
1392 | * NETDEV_UNREGISTER 1 LINKDOWN|DEAD Device removed | |
1393 | */ | |
1394 | int fib_sync_down_dev(struct net_device *dev, unsigned long event, bool force) | |
85326fa5 DL |
1395 | { |
1396 | int ret = 0; | |
1397 | int scope = RT_SCOPE_NOWHERE; | |
1398 | struct fib_info *prev_fi = NULL; | |
1399 | unsigned int hash = fib_devindex_hashfn(dev->ifindex); | |
1400 | struct hlist_head *head = &fib_info_devhash[hash]; | |
85326fa5 | 1401 | struct fib_nh *nh; |
1da177e4 | 1402 | |
4f823def | 1403 | if (force) |
85326fa5 | 1404 | scope = -1; |
1da177e4 | 1405 | |
b67bfe0d | 1406 | hlist_for_each_entry(nh, head, nh_hash) { |
85326fa5 DL |
1407 | struct fib_info *fi = nh->nh_parent; |
1408 | int dead; | |
1da177e4 | 1409 | |
85326fa5 DL |
1410 | BUG_ON(!fi->fib_nhs); |
1411 | if (nh->nh_dev != dev || fi == prev_fi) | |
1412 | continue; | |
1413 | prev_fi = fi; | |
1414 | dead = 0; | |
1415 | change_nexthops(fi) { | |
6a31d2a9 | 1416 | if (nexthop_nh->nh_flags & RTNH_F_DEAD) |
85326fa5 | 1417 | dead++; |
71fceff0 DM |
1418 | else if (nexthop_nh->nh_dev == dev && |
1419 | nexthop_nh->nh_scope != scope) { | |
8a3d0316 AG |
1420 | switch (event) { |
1421 | case NETDEV_DOWN: | |
1422 | case NETDEV_UNREGISTER: | |
1423 | nexthop_nh->nh_flags |= RTNH_F_DEAD; | |
1424 | /* fall through */ | |
1425 | case NETDEV_CHANGE: | |
1426 | nexthop_nh->nh_flags |= RTNH_F_LINKDOWN; | |
1427 | break; | |
1428 | } | |
982acb97 IS |
1429 | call_fib_nh_notifiers(nexthop_nh, |
1430 | FIB_EVENT_NH_DEL); | |
85326fa5 DL |
1431 | dead++; |
1432 | } | |
1da177e4 | 1433 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
8a3d0316 AG |
1434 | if (event == NETDEV_UNREGISTER && |
1435 | nexthop_nh->nh_dev == dev) { | |
85326fa5 DL |
1436 | dead = fi->fib_nhs; |
1437 | break; | |
1da177e4 | 1438 | } |
85326fa5 DL |
1439 | #endif |
1440 | } endfor_nexthops(fi) | |
1441 | if (dead == fi->fib_nhs) { | |
8a3d0316 AG |
1442 | switch (event) { |
1443 | case NETDEV_DOWN: | |
1444 | case NETDEV_UNREGISTER: | |
1445 | fi->fib_flags |= RTNH_F_DEAD; | |
1446 | /* fall through */ | |
1447 | case NETDEV_CHANGE: | |
1448 | fi->fib_flags |= RTNH_F_LINKDOWN; | |
1449 | break; | |
1450 | } | |
85326fa5 | 1451 | ret++; |
1da177e4 | 1452 | } |
0e884c78 PN |
1453 | |
1454 | fib_rebalance(fi); | |
1da177e4 LT |
1455 | } |
1456 | ||
1457 | return ret; | |
1458 | } | |
1459 | ||
0c838ff1 | 1460 | /* Must be invoked inside of an RCU protected region. */ |
c7b371e3 | 1461 | static void fib_select_default(const struct flowi4 *flp, struct fib_result *res) |
0c838ff1 DM |
1462 | { |
1463 | struct fib_info *fi = NULL, *last_resort = NULL; | |
56315f9e | 1464 | struct hlist_head *fa_head = res->fa_head; |
0c838ff1 | 1465 | struct fib_table *tb = res->table; |
18a912e9 | 1466 | u8 slen = 32 - res->prefixlen; |
0c838ff1 | 1467 | int order = -1, last_idx = -1; |
2392debc JA |
1468 | struct fib_alias *fa, *fa1 = NULL; |
1469 | u32 last_prio = res->fi->fib_priority; | |
1470 | u8 last_tos = 0; | |
0c838ff1 | 1471 | |
56315f9e | 1472 | hlist_for_each_entry_rcu(fa, fa_head, fa_list) { |
0c838ff1 DM |
1473 | struct fib_info *next_fi = fa->fa_info; |
1474 | ||
18a912e9 JA |
1475 | if (fa->fa_slen != slen) |
1476 | continue; | |
2392debc JA |
1477 | if (fa->fa_tos && fa->fa_tos != flp->flowi4_tos) |
1478 | continue; | |
18a912e9 JA |
1479 | if (fa->tb_id != tb->tb_id) |
1480 | continue; | |
2392debc JA |
1481 | if (next_fi->fib_priority > last_prio && |
1482 | fa->fa_tos == last_tos) { | |
1483 | if (last_tos) | |
1484 | continue; | |
1485 | break; | |
1486 | } | |
1487 | if (next_fi->fib_flags & RTNH_F_DEAD) | |
1488 | continue; | |
1489 | last_tos = fa->fa_tos; | |
1490 | last_prio = next_fi->fib_priority; | |
1491 | ||
37e826c5 | 1492 | if (next_fi->fib_scope != res->scope || |
0c838ff1 DM |
1493 | fa->fa_type != RTN_UNICAST) |
1494 | continue; | |
0c838ff1 DM |
1495 | if (!next_fi->fib_nh[0].nh_gw || |
1496 | next_fi->fib_nh[0].nh_scope != RT_SCOPE_LINK) | |
1497 | continue; | |
1498 | ||
1499 | fib_alias_accessed(fa); | |
1500 | ||
51456b29 | 1501 | if (!fi) { |
0c838ff1 DM |
1502 | if (next_fi != res->fi) |
1503 | break; | |
2392debc | 1504 | fa1 = fa; |
0c838ff1 | 1505 | } else if (!fib_detect_death(fi, order, &last_resort, |
2392debc | 1506 | &last_idx, fa1->fa_default)) { |
0c838ff1 | 1507 | fib_result_assign(res, fi); |
2392debc | 1508 | fa1->fa_default = order; |
0c838ff1 DM |
1509 | goto out; |
1510 | } | |
1511 | fi = next_fi; | |
1512 | order++; | |
1513 | } | |
1514 | ||
51456b29 | 1515 | if (order <= 0 || !fi) { |
2392debc JA |
1516 | if (fa1) |
1517 | fa1->fa_default = -1; | |
0c838ff1 DM |
1518 | goto out; |
1519 | } | |
1520 | ||
1521 | if (!fib_detect_death(fi, order, &last_resort, &last_idx, | |
2392debc | 1522 | fa1->fa_default)) { |
0c838ff1 | 1523 | fib_result_assign(res, fi); |
2392debc | 1524 | fa1->fa_default = order; |
0c838ff1 DM |
1525 | goto out; |
1526 | } | |
1527 | ||
1528 | if (last_idx >= 0) | |
1529 | fib_result_assign(res, last_resort); | |
2392debc | 1530 | fa1->fa_default = last_idx; |
0c838ff1 | 1531 | out: |
31d40937 | 1532 | return; |
0c838ff1 DM |
1533 | } |
1534 | ||
1da177e4 | 1535 | /* |
6a31d2a9 ED |
1536 | * Dead device goes up. We wake up dead nexthops. |
1537 | * It takes sense only on multipath routes. | |
1da177e4 | 1538 | */ |
8a3d0316 | 1539 | int fib_sync_up(struct net_device *dev, unsigned int nh_flags) |
1da177e4 LT |
1540 | { |
1541 | struct fib_info *prev_fi; | |
1542 | unsigned int hash; | |
1543 | struct hlist_head *head; | |
1da177e4 LT |
1544 | struct fib_nh *nh; |
1545 | int ret; | |
1546 | ||
6a31d2a9 | 1547 | if (!(dev->flags & IFF_UP)) |
1da177e4 LT |
1548 | return 0; |
1549 | ||
c9b3292e JA |
1550 | if (nh_flags & RTNH_F_DEAD) { |
1551 | unsigned int flags = dev_get_flags(dev); | |
1552 | ||
1553 | if (flags & (IFF_RUNNING | IFF_LOWER_UP)) | |
1554 | nh_flags |= RTNH_F_LINKDOWN; | |
1555 | } | |
1556 | ||
1da177e4 LT |
1557 | prev_fi = NULL; |
1558 | hash = fib_devindex_hashfn(dev->ifindex); | |
1559 | head = &fib_info_devhash[hash]; | |
1560 | ret = 0; | |
1561 | ||
b67bfe0d | 1562 | hlist_for_each_entry(nh, head, nh_hash) { |
1da177e4 LT |
1563 | struct fib_info *fi = nh->nh_parent; |
1564 | int alive; | |
1565 | ||
1566 | BUG_ON(!fi->fib_nhs); | |
1567 | if (nh->nh_dev != dev || fi == prev_fi) | |
1568 | continue; | |
1569 | ||
1570 | prev_fi = fi; | |
1571 | alive = 0; | |
1572 | change_nexthops(fi) { | |
8a3d0316 | 1573 | if (!(nexthop_nh->nh_flags & nh_flags)) { |
1da177e4 LT |
1574 | alive++; |
1575 | continue; | |
1576 | } | |
51456b29 | 1577 | if (!nexthop_nh->nh_dev || |
6a31d2a9 | 1578 | !(nexthop_nh->nh_dev->flags & IFF_UP)) |
1da177e4 | 1579 | continue; |
71fceff0 DM |
1580 | if (nexthop_nh->nh_dev != dev || |
1581 | !__in_dev_get_rtnl(dev)) | |
1da177e4 LT |
1582 | continue; |
1583 | alive++; | |
8a3d0316 | 1584 | nexthop_nh->nh_flags &= ~nh_flags; |
982acb97 | 1585 | call_fib_nh_notifiers(nexthop_nh, FIB_EVENT_NH_ADD); |
1da177e4 LT |
1586 | } endfor_nexthops(fi) |
1587 | ||
1588 | if (alive > 0) { | |
8a3d0316 | 1589 | fi->fib_flags &= ~nh_flags; |
1da177e4 LT |
1590 | ret++; |
1591 | } | |
0e884c78 PN |
1592 | |
1593 | fib_rebalance(fi); | |
1da177e4 LT |
1594 | } |
1595 | ||
1596 | return ret; | |
1597 | } | |
1598 | ||
8a3d0316 | 1599 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
a6db4494 DA |
1600 | static bool fib_good_nh(const struct fib_nh *nh) |
1601 | { | |
1602 | int state = NUD_REACHABLE; | |
1603 | ||
1604 | if (nh->nh_scope == RT_SCOPE_LINK) { | |
1605 | struct neighbour *n; | |
1606 | ||
1607 | rcu_read_lock_bh(); | |
1608 | ||
d985d151 ED |
1609 | n = __ipv4_neigh_lookup_noref(nh->nh_dev, |
1610 | (__force u32)nh->nh_gw); | |
a6db4494 DA |
1611 | if (n) |
1612 | state = n->nud_state; | |
1613 | ||
1614 | rcu_read_unlock_bh(); | |
1615 | } | |
1616 | ||
1617 | return !!(state & NUD_VALID); | |
1618 | } | |
8a3d0316 | 1619 | |
0e884c78 | 1620 | void fib_select_multipath(struct fib_result *res, int hash) |
1da177e4 LT |
1621 | { |
1622 | struct fib_info *fi = res->fi; | |
a6db4494 DA |
1623 | struct net *net = fi->fib_net; |
1624 | bool first = false; | |
1da177e4 | 1625 | |
0e884c78 PN |
1626 | for_nexthops(fi) { |
1627 | if (hash > atomic_read(&nh->nh_upper_bound)) | |
1628 | continue; | |
1da177e4 | 1629 | |
a6db4494 DA |
1630 | if (!net->ipv4.sysctl_fib_multipath_use_neigh || |
1631 | fib_good_nh(nh)) { | |
1632 | res->nh_sel = nhsel; | |
1633 | return; | |
1634 | } | |
1635 | if (!first) { | |
1636 | res->nh_sel = nhsel; | |
1637 | first = true; | |
1638 | } | |
1da177e4 | 1639 | } endfor_nexthops(fi); |
1da177e4 LT |
1640 | } |
1641 | #endif | |
3ce58d84 DA |
1642 | |
1643 | void fib_select_path(struct net *net, struct fib_result *res, | |
1644 | struct flowi4 *fl4, int mp_hash) | |
1645 | { | |
7a18c5b9 DA |
1646 | bool oif_check; |
1647 | ||
1648 | oif_check = (fl4->flowi4_oif == 0 || | |
1649 | fl4->flowi4_flags & FLOWI_FLAG_SKIP_NH_OIF); | |
1650 | ||
3ce58d84 | 1651 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
7a18c5b9 | 1652 | if (res->fi->fib_nhs > 1 && oif_check) { |
3ce58d84 | 1653 | if (mp_hash < 0) |
9920e48b PA |
1654 | mp_hash = get_hash_from_flowi4(fl4) >> 1; |
1655 | ||
3ce58d84 DA |
1656 | fib_select_multipath(res, mp_hash); |
1657 | } | |
1658 | else | |
1659 | #endif | |
1660 | if (!res->prefixlen && | |
1661 | res->table->tb_num_default > 1 && | |
7a18c5b9 | 1662 | res->type == RTN_UNICAST && oif_check) |
3ce58d84 DA |
1663 | fib_select_default(fl4, res); |
1664 | ||
1665 | if (!fl4->saddr) | |
1666 | fl4->saddr = FIB_RES_PREFSRC(net, *res); | |
1667 | } | |
1668 | EXPORT_SYMBOL_GPL(fib_select_path); |