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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
4 | * operating system. INET is implemented using the BSD Socket | |
5 | * interface as the means of communication with the user level. | |
6 | * | |
7 | * IPv4 Forwarding Information Base: semantics. | |
8 | * | |
1da177e4 | 9 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> |
1da177e4 LT |
10 | */ |
11 | ||
7c0f6ba6 | 12 | #include <linux/uaccess.h> |
1da177e4 LT |
13 | #include <linux/bitops.h> |
14 | #include <linux/types.h> | |
15 | #include <linux/kernel.h> | |
16 | #include <linux/jiffies.h> | |
17 | #include <linux/mm.h> | |
18 | #include <linux/string.h> | |
19 | #include <linux/socket.h> | |
20 | #include <linux/sockios.h> | |
21 | #include <linux/errno.h> | |
22 | #include <linux/in.h> | |
23 | #include <linux/inet.h> | |
14c85021 | 24 | #include <linux/inetdevice.h> |
1da177e4 LT |
25 | #include <linux/netdevice.h> |
26 | #include <linux/if_arp.h> | |
27 | #include <linux/proc_fs.h> | |
28 | #include <linux/skbuff.h> | |
1da177e4 | 29 | #include <linux/init.h> |
5a0e3ad6 | 30 | #include <linux/slab.h> |
c3ab2b4e | 31 | #include <linux/netlink.h> |
1da177e4 | 32 | |
14c85021 | 33 | #include <net/arp.h> |
1da177e4 LT |
34 | #include <net/ip.h> |
35 | #include <net/protocol.h> | |
36 | #include <net/route.h> | |
37 | #include <net/tcp.h> | |
38 | #include <net/sock.h> | |
39 | #include <net/ip_fib.h> | |
717a8f5b | 40 | #include <net/ip6_fib.h> |
5481d73f | 41 | #include <net/nexthop.h> |
f21c7bc5 | 42 | #include <net/netlink.h> |
3c618c1d | 43 | #include <net/rtnh.h> |
571e7226 | 44 | #include <net/lwtunnel.h> |
04b1d4e5 | 45 | #include <net/fib_notifier.h> |
c0a72077 | 46 | #include <net/addrconf.h> |
1da177e4 LT |
47 | |
48 | #include "fib_lookup.h" | |
49 | ||
832b4c5e | 50 | static DEFINE_SPINLOCK(fib_info_lock); |
1da177e4 LT |
51 | static struct hlist_head *fib_info_hash; |
52 | static struct hlist_head *fib_info_laddrhash; | |
123b9731 | 53 | static unsigned int fib_info_hash_size; |
1da177e4 LT |
54 | static unsigned int fib_info_cnt; |
55 | ||
56 | #define DEVINDEX_HASHBITS 8 | |
57 | #define DEVINDEX_HASHSIZE (1U << DEVINDEX_HASHBITS) | |
58 | static struct hlist_head fib_info_devhash[DEVINDEX_HASHSIZE]; | |
59 | ||
dcb1ecb5 DA |
60 | /* for_nexthops and change_nexthops only used when nexthop object |
61 | * is not set in a fib_info. The logic within can reference fib_nh. | |
62 | */ | |
1da177e4 | 63 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
1da177e4 | 64 | |
6a31d2a9 ED |
65 | #define for_nexthops(fi) { \ |
66 | int nhsel; const struct fib_nh *nh; \ | |
67 | for (nhsel = 0, nh = (fi)->fib_nh; \ | |
5481d73f | 68 | nhsel < fib_info_num_path((fi)); \ |
6a31d2a9 ED |
69 | nh++, nhsel++) |
70 | ||
71 | #define change_nexthops(fi) { \ | |
72 | int nhsel; struct fib_nh *nexthop_nh; \ | |
73 | for (nhsel = 0, nexthop_nh = (struct fib_nh *)((fi)->fib_nh); \ | |
5481d73f | 74 | nhsel < fib_info_num_path((fi)); \ |
6a31d2a9 | 75 | nexthop_nh++, nhsel++) |
1da177e4 LT |
76 | |
77 | #else /* CONFIG_IP_ROUTE_MULTIPATH */ | |
78 | ||
79 | /* Hope, that gcc will optimize it to get rid of dummy loop */ | |
80 | ||
6a31d2a9 ED |
81 | #define for_nexthops(fi) { \ |
82 | int nhsel; const struct fib_nh *nh = (fi)->fib_nh; \ | |
83 | for (nhsel = 0; nhsel < 1; nhsel++) | |
1da177e4 | 84 | |
6a31d2a9 ED |
85 | #define change_nexthops(fi) { \ |
86 | int nhsel; \ | |
87 | struct fib_nh *nexthop_nh = (struct fib_nh *)((fi)->fib_nh); \ | |
88 | for (nhsel = 0; nhsel < 1; nhsel++) | |
1da177e4 LT |
89 | |
90 | #endif /* CONFIG_IP_ROUTE_MULTIPATH */ | |
91 | ||
92 | #define endfor_nexthops(fi) } | |
93 | ||
94 | ||
3be0686b | 95 | const struct fib_prop fib_props[RTN_MAX + 1] = { |
6a31d2a9 | 96 | [RTN_UNSPEC] = { |
1da177e4 LT |
97 | .error = 0, |
98 | .scope = RT_SCOPE_NOWHERE, | |
6a31d2a9 ED |
99 | }, |
100 | [RTN_UNICAST] = { | |
1da177e4 LT |
101 | .error = 0, |
102 | .scope = RT_SCOPE_UNIVERSE, | |
6a31d2a9 ED |
103 | }, |
104 | [RTN_LOCAL] = { | |
1da177e4 LT |
105 | .error = 0, |
106 | .scope = RT_SCOPE_HOST, | |
6a31d2a9 ED |
107 | }, |
108 | [RTN_BROADCAST] = { | |
1da177e4 LT |
109 | .error = 0, |
110 | .scope = RT_SCOPE_LINK, | |
6a31d2a9 ED |
111 | }, |
112 | [RTN_ANYCAST] = { | |
1da177e4 LT |
113 | .error = 0, |
114 | .scope = RT_SCOPE_LINK, | |
6a31d2a9 ED |
115 | }, |
116 | [RTN_MULTICAST] = { | |
1da177e4 LT |
117 | .error = 0, |
118 | .scope = RT_SCOPE_UNIVERSE, | |
6a31d2a9 ED |
119 | }, |
120 | [RTN_BLACKHOLE] = { | |
1da177e4 LT |
121 | .error = -EINVAL, |
122 | .scope = RT_SCOPE_UNIVERSE, | |
6a31d2a9 ED |
123 | }, |
124 | [RTN_UNREACHABLE] = { | |
1da177e4 LT |
125 | .error = -EHOSTUNREACH, |
126 | .scope = RT_SCOPE_UNIVERSE, | |
6a31d2a9 ED |
127 | }, |
128 | [RTN_PROHIBIT] = { | |
1da177e4 LT |
129 | .error = -EACCES, |
130 | .scope = RT_SCOPE_UNIVERSE, | |
6a31d2a9 ED |
131 | }, |
132 | [RTN_THROW] = { | |
1da177e4 LT |
133 | .error = -EAGAIN, |
134 | .scope = RT_SCOPE_UNIVERSE, | |
6a31d2a9 ED |
135 | }, |
136 | [RTN_NAT] = { | |
1da177e4 LT |
137 | .error = -EINVAL, |
138 | .scope = RT_SCOPE_NOWHERE, | |
6a31d2a9 ED |
139 | }, |
140 | [RTN_XRESOLVE] = { | |
1da177e4 LT |
141 | .error = -EINVAL, |
142 | .scope = RT_SCOPE_NOWHERE, | |
6a31d2a9 | 143 | }, |
1da177e4 LT |
144 | }; |
145 | ||
c5038a83 DM |
146 | static void rt_fibinfo_free(struct rtable __rcu **rtp) |
147 | { | |
148 | struct rtable *rt = rcu_dereference_protected(*rtp, 1); | |
149 | ||
150 | if (!rt) | |
151 | return; | |
152 | ||
153 | /* Not even needed : RCU_INIT_POINTER(*rtp, NULL); | |
154 | * because we waited an RCU grace period before calling | |
155 | * free_fib_info_rcu() | |
156 | */ | |
157 | ||
95c47f9c | 158 | dst_dev_put(&rt->dst); |
b838d5e1 | 159 | dst_release_immediate(&rt->dst); |
c5038a83 DM |
160 | } |
161 | ||
a5995e71 | 162 | static void free_nh_exceptions(struct fib_nh_common *nhc) |
4895c771 | 163 | { |
caa41527 | 164 | struct fnhe_hash_bucket *hash; |
4895c771 DM |
165 | int i; |
166 | ||
a5995e71 | 167 | hash = rcu_dereference_protected(nhc->nhc_exceptions, 1); |
caa41527 ED |
168 | if (!hash) |
169 | return; | |
4895c771 DM |
170 | for (i = 0; i < FNHE_HASH_SIZE; i++) { |
171 | struct fib_nh_exception *fnhe; | |
172 | ||
5abf7f7e | 173 | fnhe = rcu_dereference_protected(hash[i].chain, 1); |
4895c771 DM |
174 | while (fnhe) { |
175 | struct fib_nh_exception *next; | |
82695b30 | 176 | |
5abf7f7e | 177 | next = rcu_dereference_protected(fnhe->fnhe_next, 1); |
c5038a83 | 178 | |
2ffae99d TT |
179 | rt_fibinfo_free(&fnhe->fnhe_rth_input); |
180 | rt_fibinfo_free(&fnhe->fnhe_rth_output); | |
c5038a83 | 181 | |
4895c771 DM |
182 | kfree(fnhe); |
183 | ||
184 | fnhe = next; | |
185 | } | |
186 | } | |
187 | kfree(hash); | |
188 | } | |
189 | ||
c5038a83 | 190 | static void rt_fibinfo_free_cpus(struct rtable __rcu * __percpu *rtp) |
d26b3a7c ED |
191 | { |
192 | int cpu; | |
193 | ||
194 | if (!rtp) | |
195 | return; | |
196 | ||
197 | for_each_possible_cpu(cpu) { | |
198 | struct rtable *rt; | |
199 | ||
200 | rt = rcu_dereference_protected(*per_cpu_ptr(rtp, cpu), 1); | |
0830106c | 201 | if (rt) { |
95c47f9c | 202 | dst_dev_put(&rt->dst); |
b838d5e1 | 203 | dst_release_immediate(&rt->dst); |
0830106c | 204 | } |
d26b3a7c ED |
205 | } |
206 | free_percpu(rtp); | |
207 | } | |
208 | ||
979e276e DA |
209 | void fib_nh_common_release(struct fib_nh_common *nhc) |
210 | { | |
211 | if (nhc->nhc_dev) | |
212 | dev_put(nhc->nhc_dev); | |
213 | ||
214 | lwtstate_put(nhc->nhc_lwtstate); | |
0f457a36 DA |
215 | rt_fibinfo_free_cpus(nhc->nhc_pcpu_rth_output); |
216 | rt_fibinfo_free(&nhc->nhc_rth_input); | |
a5995e71 | 217 | free_nh_exceptions(nhc); |
979e276e DA |
218 | } |
219 | EXPORT_SYMBOL_GPL(fib_nh_common_release); | |
220 | ||
faa041a4 DA |
221 | void fib_nh_release(struct net *net, struct fib_nh *fib_nh) |
222 | { | |
223 | #ifdef CONFIG_IP_ROUTE_CLASSID | |
224 | if (fib_nh->nh_tclassid) | |
225 | net->ipv4.fib_num_tclassid_users--; | |
226 | #endif | |
979e276e | 227 | fib_nh_common_release(&fib_nh->nh_common); |
faa041a4 DA |
228 | } |
229 | ||
1da177e4 | 230 | /* Release a nexthop info record */ |
19c1ea14 YZ |
231 | static void free_fib_info_rcu(struct rcu_head *head) |
232 | { | |
233 | struct fib_info *fi = container_of(head, struct fib_info, rcu); | |
234 | ||
4c7e8084 DA |
235 | if (fi->nh) { |
236 | nexthop_put(fi->nh); | |
237 | } else { | |
238 | change_nexthops(fi) { | |
239 | fib_nh_release(fi->fib_net, nexthop_nh); | |
240 | } endfor_nexthops(fi); | |
241 | } | |
e49cc0da | 242 | |
cc5f0eb2 DA |
243 | ip_fib_metrics_put(fi->fib_metrics); |
244 | ||
19c1ea14 YZ |
245 | kfree(fi); |
246 | } | |
1da177e4 LT |
247 | |
248 | void free_fib_info(struct fib_info *fi) | |
249 | { | |
250 | if (fi->fib_dead == 0) { | |
058bd4d2 | 251 | pr_warn("Freeing alive fib_info %p\n", fi); |
1da177e4 LT |
252 | return; |
253 | } | |
1da177e4 | 254 | fib_info_cnt--; |
faa041a4 | 255 | |
19c1ea14 | 256 | call_rcu(&fi->rcu, free_fib_info_rcu); |
1da177e4 | 257 | } |
b423cb10 | 258 | EXPORT_SYMBOL_GPL(free_fib_info); |
1da177e4 LT |
259 | |
260 | void fib_release_info(struct fib_info *fi) | |
261 | { | |
832b4c5e | 262 | spin_lock_bh(&fib_info_lock); |
1da177e4 LT |
263 | if (fi && --fi->fib_treeref == 0) { |
264 | hlist_del(&fi->fib_hash); | |
265 | if (fi->fib_prefsrc) | |
266 | hlist_del(&fi->fib_lhash); | |
4c7e8084 DA |
267 | if (fi->nh) { |
268 | list_del(&fi->nh_list); | |
269 | } else { | |
270 | change_nexthops(fi) { | |
271 | if (!nexthop_nh->fib_nh_dev) | |
272 | continue; | |
273 | hlist_del(&nexthop_nh->nh_hash); | |
274 | } endfor_nexthops(fi) | |
275 | } | |
1da177e4 LT |
276 | fi->fib_dead = 1; |
277 | fib_info_put(fi); | |
278 | } | |
832b4c5e | 279 | spin_unlock_bh(&fib_info_lock); |
1da177e4 LT |
280 | } |
281 | ||
5481d73f | 282 | static inline int nh_comp(struct fib_info *fi, struct fib_info *ofi) |
1da177e4 | 283 | { |
5481d73f | 284 | const struct fib_nh *onh; |
1da177e4 | 285 | |
4c7e8084 DA |
286 | if (fi->nh || ofi->nh) |
287 | return nexthop_cmp(fi->nh, ofi->nh) ? 0 : -1; | |
288 | ||
289 | if (ofi->fib_nhs == 0) | |
290 | return 0; | |
291 | ||
1da177e4 | 292 | for_nexthops(fi) { |
5481d73f DA |
293 | onh = fib_info_nh(ofi, nhsel); |
294 | ||
b75ed8b1 | 295 | if (nh->fib_nh_oif != onh->fib_nh_oif || |
a4ea5d43 | 296 | nh->fib_nh_gw_family != onh->fib_nh_gw_family || |
b75ed8b1 | 297 | nh->fib_nh_scope != onh->fib_nh_scope || |
1da177e4 | 298 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
b75ed8b1 | 299 | nh->fib_nh_weight != onh->fib_nh_weight || |
1da177e4 | 300 | #endif |
c7066f70 | 301 | #ifdef CONFIG_IP_ROUTE_CLASSID |
1da177e4 LT |
302 | nh->nh_tclassid != onh->nh_tclassid || |
303 | #endif | |
b75ed8b1 DA |
304 | lwtunnel_cmp_encap(nh->fib_nh_lws, onh->fib_nh_lws) || |
305 | ((nh->fib_nh_flags ^ onh->fib_nh_flags) & ~RTNH_COMPARE_MASK)) | |
1da177e4 | 306 | return -1; |
a4ea5d43 DA |
307 | |
308 | if (nh->fib_nh_gw_family == AF_INET && | |
309 | nh->fib_nh_gw4 != onh->fib_nh_gw4) | |
310 | return -1; | |
311 | ||
312 | if (nh->fib_nh_gw_family == AF_INET6 && | |
313 | ipv6_addr_cmp(&nh->fib_nh_gw6, &onh->fib_nh_gw6)) | |
314 | return -1; | |
1da177e4 LT |
315 | } endfor_nexthops(fi); |
316 | return 0; | |
317 | } | |
318 | ||
88ebc72f DM |
319 | static inline unsigned int fib_devindex_hashfn(unsigned int val) |
320 | { | |
321 | unsigned int mask = DEVINDEX_HASHSIZE - 1; | |
322 | ||
323 | return (val ^ | |
324 | (val >> DEVINDEX_HASHBITS) ^ | |
325 | (val >> (DEVINDEX_HASHBITS * 2))) & mask; | |
326 | } | |
327 | ||
6c48ea5f DA |
328 | static unsigned int fib_info_hashfn_1(int init_val, u8 protocol, u8 scope, |
329 | u32 prefsrc, u32 priority) | |
330 | { | |
331 | unsigned int val = init_val; | |
332 | ||
333 | val ^= (protocol << 8) | scope; | |
334 | val ^= prefsrc; | |
335 | val ^= priority; | |
336 | ||
337 | return val; | |
338 | } | |
339 | ||
340 | static unsigned int fib_info_hashfn_result(unsigned int val) | |
1da177e4 | 341 | { |
123b9731 | 342 | unsigned int mask = (fib_info_hash_size - 1); |
1da177e4 | 343 | |
6c48ea5f DA |
344 | return (val ^ (val >> 7) ^ (val >> 12)) & mask; |
345 | } | |
346 | ||
347 | static inline unsigned int fib_info_hashfn(struct fib_info *fi) | |
348 | { | |
349 | unsigned int val; | |
350 | ||
351 | val = fib_info_hashfn_1(fi->fib_nhs, fi->fib_protocol, | |
352 | fi->fib_scope, (__force u32)fi->fib_prefsrc, | |
353 | fi->fib_priority); | |
4c7e8084 DA |
354 | |
355 | if (fi->nh) { | |
356 | val ^= fib_devindex_hashfn(fi->nh->id); | |
357 | } else { | |
358 | for_nexthops(fi) { | |
359 | val ^= fib_devindex_hashfn(nh->fib_nh_oif); | |
360 | } endfor_nexthops(fi) | |
361 | } | |
1da177e4 | 362 | |
6c48ea5f DA |
363 | return fib_info_hashfn_result(val); |
364 | } | |
365 | ||
366 | /* no metrics, only nexthop id */ | |
367 | static struct fib_info *fib_find_info_nh(struct net *net, | |
368 | const struct fib_config *cfg) | |
369 | { | |
370 | struct hlist_head *head; | |
371 | struct fib_info *fi; | |
372 | unsigned int hash; | |
373 | ||
374 | hash = fib_info_hashfn_1(fib_devindex_hashfn(cfg->fc_nh_id), | |
375 | cfg->fc_protocol, cfg->fc_scope, | |
376 | (__force u32)cfg->fc_prefsrc, | |
377 | cfg->fc_priority); | |
378 | hash = fib_info_hashfn_result(hash); | |
379 | head = &fib_info_hash[hash]; | |
380 | ||
381 | hlist_for_each_entry(fi, head, fib_hash) { | |
382 | if (!net_eq(fi->fib_net, net)) | |
383 | continue; | |
384 | if (!fi->nh || fi->nh->id != cfg->fc_nh_id) | |
385 | continue; | |
386 | if (cfg->fc_protocol == fi->fib_protocol && | |
387 | cfg->fc_scope == fi->fib_scope && | |
388 | cfg->fc_prefsrc == fi->fib_prefsrc && | |
389 | cfg->fc_priority == fi->fib_priority && | |
390 | cfg->fc_type == fi->fib_type && | |
391 | cfg->fc_table == fi->fib_tb_id && | |
392 | !((cfg->fc_flags ^ fi->fib_flags) & ~RTNH_COMPARE_MASK)) | |
393 | return fi; | |
394 | } | |
395 | ||
396 | return NULL; | |
1da177e4 LT |
397 | } |
398 | ||
5481d73f | 399 | static struct fib_info *fib_find_info(struct fib_info *nfi) |
1da177e4 LT |
400 | { |
401 | struct hlist_head *head; | |
1da177e4 LT |
402 | struct fib_info *fi; |
403 | unsigned int hash; | |
404 | ||
405 | hash = fib_info_hashfn(nfi); | |
406 | head = &fib_info_hash[hash]; | |
407 | ||
b67bfe0d | 408 | hlist_for_each_entry(fi, head, fib_hash) { |
09ad9bc7 | 409 | if (!net_eq(fi->fib_net, nfi->fib_net)) |
4814bdbd | 410 | continue; |
1da177e4 LT |
411 | if (fi->fib_nhs != nfi->fib_nhs) |
412 | continue; | |
413 | if (nfi->fib_protocol == fi->fib_protocol && | |
37e826c5 | 414 | nfi->fib_scope == fi->fib_scope && |
1da177e4 LT |
415 | nfi->fib_prefsrc == fi->fib_prefsrc && |
416 | nfi->fib_priority == fi->fib_priority && | |
f4ef85bb | 417 | nfi->fib_type == fi->fib_type && |
1da177e4 | 418 | memcmp(nfi->fib_metrics, fi->fib_metrics, |
fcd13f42 | 419 | sizeof(u32) * RTAX_MAX) == 0 && |
8a3d0316 | 420 | !((nfi->fib_flags ^ fi->fib_flags) & ~RTNH_COMPARE_MASK) && |
4c7e8084 | 421 | nh_comp(fi, nfi) == 0) |
1da177e4 LT |
422 | return fi; |
423 | } | |
424 | ||
425 | return NULL; | |
426 | } | |
427 | ||
1da177e4 | 428 | /* Check, that the gateway is already configured. |
6a31d2a9 | 429 | * Used only by redirect accept routine. |
1da177e4 | 430 | */ |
d878e72e | 431 | int ip_fib_check_default(__be32 gw, struct net_device *dev) |
1da177e4 LT |
432 | { |
433 | struct hlist_head *head; | |
1da177e4 LT |
434 | struct fib_nh *nh; |
435 | unsigned int hash; | |
436 | ||
832b4c5e | 437 | spin_lock(&fib_info_lock); |
1da177e4 LT |
438 | |
439 | hash = fib_devindex_hashfn(dev->ifindex); | |
440 | head = &fib_info_devhash[hash]; | |
b67bfe0d | 441 | hlist_for_each_entry(nh, head, nh_hash) { |
b75ed8b1 DA |
442 | if (nh->fib_nh_dev == dev && |
443 | nh->fib_nh_gw4 == gw && | |
444 | !(nh->fib_nh_flags & RTNH_F_DEAD)) { | |
832b4c5e | 445 | spin_unlock(&fib_info_lock); |
1da177e4 LT |
446 | return 0; |
447 | } | |
448 | } | |
449 | ||
832b4c5e | 450 | spin_unlock(&fib_info_lock); |
1da177e4 LT |
451 | |
452 | return -1; | |
453 | } | |
454 | ||
339bf98f TG |
455 | static inline size_t fib_nlmsg_size(struct fib_info *fi) |
456 | { | |
457 | size_t payload = NLMSG_ALIGN(sizeof(struct rtmsg)) | |
458 | + nla_total_size(4) /* RTA_TABLE */ | |
459 | + nla_total_size(4) /* RTA_DST */ | |
460 | + nla_total_size(4) /* RTA_PRIORITY */ | |
ea697639 DB |
461 | + nla_total_size(4) /* RTA_PREFSRC */ |
462 | + nla_total_size(TCP_CA_NAME_MAX); /* RTAX_CC_ALGO */ | |
5481d73f | 463 | unsigned int nhs = fib_info_num_path(fi); |
339bf98f TG |
464 | |
465 | /* space for nested metrics */ | |
466 | payload += nla_total_size((RTAX_MAX * nla_total_size(4))); | |
467 | ||
4c7e8084 DA |
468 | if (fi->nh) |
469 | payload += nla_total_size(4); /* RTA_NH_ID */ | |
470 | ||
5481d73f | 471 | if (nhs) { |
571e7226 | 472 | size_t nh_encapsize = 0; |
5481d73f | 473 | /* Also handles the special case nhs == 1 */ |
339bf98f TG |
474 | |
475 | /* each nexthop is packed in an attribute */ | |
476 | size_t nhsize = nla_total_size(sizeof(struct rtnexthop)); | |
dcb1ecb5 | 477 | unsigned int i; |
339bf98f TG |
478 | |
479 | /* may contain flow and gateway attribute */ | |
480 | nhsize += 2 * nla_total_size(4); | |
481 | ||
571e7226 | 482 | /* grab encap info */ |
dcb1ecb5 DA |
483 | for (i = 0; i < fib_info_num_path(fi); i++) { |
484 | struct fib_nh_common *nhc = fib_info_nhc(fi, i); | |
485 | ||
486 | if (nhc->nhc_lwtstate) { | |
571e7226 RP |
487 | /* RTA_ENCAP_TYPE */ |
488 | nh_encapsize += lwtunnel_get_encap_size( | |
dcb1ecb5 | 489 | nhc->nhc_lwtstate); |
571e7226 RP |
490 | /* RTA_ENCAP */ |
491 | nh_encapsize += nla_total_size(2); | |
492 | } | |
dcb1ecb5 | 493 | } |
571e7226 | 494 | |
339bf98f | 495 | /* all nexthops are packed in a nested attribute */ |
5481d73f | 496 | payload += nla_total_size((nhs * nhsize) + nh_encapsize); |
571e7226 | 497 | |
339bf98f TG |
498 | } |
499 | ||
500 | return payload; | |
501 | } | |
502 | ||
81f7bf6c | 503 | void rtmsg_fib(int event, __be32 key, struct fib_alias *fa, |
9877b253 | 504 | int dst_len, u32 tb_id, const struct nl_info *info, |
b8f55831 | 505 | unsigned int nlm_flags) |
1da177e4 | 506 | { |
1e301fd0 | 507 | struct fib_rt_info fri; |
1da177e4 | 508 | struct sk_buff *skb; |
4e902c57 | 509 | u32 seq = info->nlh ? info->nlh->nlmsg_seq : 0; |
f21c7bc5 | 510 | int err = -ENOBUFS; |
1da177e4 | 511 | |
339bf98f | 512 | skb = nlmsg_new(fib_nlmsg_size(fa->fa_info), GFP_KERNEL); |
51456b29 | 513 | if (!skb) |
f21c7bc5 | 514 | goto errout; |
1da177e4 | 515 | |
1e301fd0 IS |
516 | fri.fi = fa->fa_info; |
517 | fri.tb_id = tb_id; | |
518 | fri.dst = key; | |
519 | fri.dst_len = dst_len; | |
520 | fri.tos = fa->fa_tos; | |
521 | fri.type = fa->fa_type; | |
90b93f1b IS |
522 | fri.offload = fa->offload; |
523 | fri.trap = fa->trap; | |
1e301fd0 | 524 | err = fib_dump_info(skb, info->portid, seq, event, &fri, nlm_flags); |
26932566 PM |
525 | if (err < 0) { |
526 | /* -EMSGSIZE implies BUG in fib_nlmsg_size() */ | |
527 | WARN_ON(err == -EMSGSIZE); | |
528 | kfree_skb(skb); | |
529 | goto errout; | |
530 | } | |
15e47304 | 531 | rtnl_notify(skb, info->nl_net, info->portid, RTNLGRP_IPV4_ROUTE, |
1ce85fe4 PNA |
532 | info->nlh, GFP_KERNEL); |
533 | return; | |
f21c7bc5 TG |
534 | errout: |
535 | if (err < 0) | |
4d1169c1 | 536 | rtnl_set_sk_err(info->nl_net, RTNLGRP_IPV4_ROUTE, err); |
1da177e4 LT |
537 | } |
538 | ||
c9cb6b6e SH |
539 | static int fib_detect_death(struct fib_info *fi, int order, |
540 | struct fib_info **last_resort, int *last_idx, | |
541 | int dflt) | |
1da177e4 | 542 | { |
619d1826 | 543 | const struct fib_nh_common *nhc = fib_info_nhc(fi, 0); |
1da177e4 LT |
544 | struct neighbour *n; |
545 | int state = NUD_NONE; | |
546 | ||
619d1826 DA |
547 | if (likely(nhc->nhc_gw_family == AF_INET)) |
548 | n = neigh_lookup(&arp_tbl, &nhc->nhc_gw.ipv4, nhc->nhc_dev); | |
549 | else if (nhc->nhc_gw_family == AF_INET6) | |
550 | n = neigh_lookup(ipv6_stub->nd_tbl, &nhc->nhc_gw.ipv6, | |
551 | nhc->nhc_dev); | |
552 | else | |
553 | n = NULL; | |
554 | ||
1da177e4 LT |
555 | if (n) { |
556 | state = n->nud_state; | |
557 | neigh_release(n); | |
88f64320 JA |
558 | } else { |
559 | return 0; | |
1da177e4 | 560 | } |
d9319100 | 561 | if (state == NUD_REACHABLE) |
1da177e4 | 562 | return 0; |
6a31d2a9 | 563 | if ((state & NUD_VALID) && order != dflt) |
1da177e4 | 564 | return 0; |
6a31d2a9 | 565 | if ((state & NUD_VALID) || |
88f64320 | 566 | (*last_idx < 0 && order > dflt && state != NUD_INCOMPLETE)) { |
1da177e4 LT |
567 | *last_resort = fi; |
568 | *last_idx = order; | |
569 | } | |
570 | return 1; | |
571 | } | |
572 | ||
faee6769 AA |
573 | int fib_nh_common_init(struct net *net, struct fib_nh_common *nhc, |
574 | struct nlattr *encap, u16 encap_type, | |
575 | void *cfg, gfp_t gfp_flags, | |
979e276e DA |
576 | struct netlink_ext_ack *extack) |
577 | { | |
0f457a36 DA |
578 | int err; |
579 | ||
580 | nhc->nhc_pcpu_rth_output = alloc_percpu_gfp(struct rtable __rcu *, | |
581 | gfp_flags); | |
582 | if (!nhc->nhc_pcpu_rth_output) | |
583 | return -ENOMEM; | |
584 | ||
979e276e DA |
585 | if (encap) { |
586 | struct lwtunnel_state *lwtstate; | |
979e276e DA |
587 | |
588 | if (encap_type == LWTUNNEL_ENCAP_NONE) { | |
589 | NL_SET_ERR_MSG(extack, "LWT encap type not specified"); | |
0f457a36 DA |
590 | err = -EINVAL; |
591 | goto lwt_failure; | |
979e276e | 592 | } |
faee6769 AA |
593 | err = lwtunnel_build_state(net, encap_type, encap, |
594 | nhc->nhc_family, cfg, &lwtstate, | |
595 | extack); | |
979e276e | 596 | if (err) |
0f457a36 | 597 | goto lwt_failure; |
979e276e DA |
598 | |
599 | nhc->nhc_lwtstate = lwtstate_get(lwtstate); | |
600 | } | |
601 | ||
602 | return 0; | |
0f457a36 DA |
603 | |
604 | lwt_failure: | |
605 | rt_fibinfo_free_cpus(nhc->nhc_pcpu_rth_output); | |
606 | nhc->nhc_pcpu_rth_output = NULL; | |
607 | return err; | |
979e276e DA |
608 | } |
609 | EXPORT_SYMBOL_GPL(fib_nh_common_init); | |
610 | ||
e4516ef6 DA |
611 | int fib_nh_init(struct net *net, struct fib_nh *nh, |
612 | struct fib_config *cfg, int nh_weight, | |
613 | struct netlink_ext_ack *extack) | |
614 | { | |
0f457a36 | 615 | int err; |
e4516ef6 | 616 | |
f1741730 DA |
617 | nh->fib_nh_family = AF_INET; |
618 | ||
faee6769 | 619 | err = fib_nh_common_init(net, &nh->nh_common, cfg->fc_encap, |
979e276e DA |
620 | cfg->fc_encap_type, cfg, GFP_KERNEL, extack); |
621 | if (err) | |
0f457a36 | 622 | return err; |
e4516ef6 | 623 | |
b75ed8b1 | 624 | nh->fib_nh_oif = cfg->fc_oif; |
a4ea5d43 DA |
625 | nh->fib_nh_gw_family = cfg->fc_gw_family; |
626 | if (cfg->fc_gw_family == AF_INET) | |
f35b794b | 627 | nh->fib_nh_gw4 = cfg->fc_gw4; |
a4ea5d43 DA |
628 | else if (cfg->fc_gw_family == AF_INET6) |
629 | nh->fib_nh_gw6 = cfg->fc_gw6; | |
630 | ||
b75ed8b1 | 631 | nh->fib_nh_flags = cfg->fc_flags; |
e4516ef6 DA |
632 | |
633 | #ifdef CONFIG_IP_ROUTE_CLASSID | |
634 | nh->nh_tclassid = cfg->fc_flow; | |
635 | if (nh->nh_tclassid) | |
636 | net->ipv4.fib_num_tclassid_users++; | |
637 | #endif | |
638 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
b75ed8b1 | 639 | nh->fib_nh_weight = nh_weight; |
e4516ef6 DA |
640 | #endif |
641 | return 0; | |
e4516ef6 DA |
642 | } |
643 | ||
1da177e4 LT |
644 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
645 | ||
6d8422a1 DA |
646 | static int fib_count_nexthops(struct rtnexthop *rtnh, int remaining, |
647 | struct netlink_ext_ack *extack) | |
1da177e4 LT |
648 | { |
649 | int nhs = 0; | |
1da177e4 | 650 | |
4e902c57 | 651 | while (rtnh_ok(rtnh, remaining)) { |
1da177e4 | 652 | nhs++; |
4e902c57 TG |
653 | rtnh = rtnh_next(rtnh, &remaining); |
654 | } | |
655 | ||
656 | /* leftover implies invalid nexthop configuration, discard it */ | |
c3ab2b4e DA |
657 | if (remaining > 0) { |
658 | NL_SET_ERR_MSG(extack, | |
659 | "Invalid nexthop configuration - extra data after nexthops"); | |
660 | nhs = 0; | |
661 | } | |
662 | ||
663 | return nhs; | |
1da177e4 LT |
664 | } |
665 | ||
4c7e8084 | 666 | /* only called when fib_nh is integrated into fib_info */ |
4e902c57 | 667 | static int fib_get_nhs(struct fib_info *fi, struct rtnexthop *rtnh, |
6d8422a1 DA |
668 | int remaining, struct fib_config *cfg, |
669 | struct netlink_ext_ack *extack) | |
1da177e4 | 670 | { |
e4516ef6 DA |
671 | struct net *net = fi->fib_net; |
672 | struct fib_config fib_cfg; | |
5481d73f | 673 | struct fib_nh *nh; |
571e7226 RP |
674 | int ret; |
675 | ||
1da177e4 | 676 | change_nexthops(fi) { |
4e902c57 TG |
677 | int attrlen; |
678 | ||
e4516ef6 DA |
679 | memset(&fib_cfg, 0, sizeof(fib_cfg)); |
680 | ||
c3ab2b4e DA |
681 | if (!rtnh_ok(rtnh, remaining)) { |
682 | NL_SET_ERR_MSG(extack, | |
683 | "Invalid nexthop configuration - extra data after nexthop"); | |
1da177e4 | 684 | return -EINVAL; |
c3ab2b4e | 685 | } |
4e902c57 | 686 | |
c3ab2b4e DA |
687 | if (rtnh->rtnh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)) { |
688 | NL_SET_ERR_MSG(extack, | |
689 | "Invalid flags for nexthop - can not contain DEAD or LINKDOWN"); | |
80610229 | 690 | return -EINVAL; |
c3ab2b4e | 691 | } |
80610229 | 692 | |
e4516ef6 DA |
693 | fib_cfg.fc_flags = (cfg->fc_flags & ~0xFF) | rtnh->rtnh_flags; |
694 | fib_cfg.fc_oif = rtnh->rtnh_ifindex; | |
4e902c57 TG |
695 | |
696 | attrlen = rtnh_attrlen(rtnh); | |
697 | if (attrlen > 0) { | |
d1566268 | 698 | struct nlattr *nla, *nlav, *attrs = rtnh_attrs(rtnh); |
4e902c57 TG |
699 | |
700 | nla = nla_find(attrs, attrlen, RTA_GATEWAY); | |
d1566268 DA |
701 | nlav = nla_find(attrs, attrlen, RTA_VIA); |
702 | if (nla && nlav) { | |
703 | NL_SET_ERR_MSG(extack, | |
704 | "Nexthop configuration can not contain both GATEWAY and VIA"); | |
705 | return -EINVAL; | |
706 | } | |
f35b794b | 707 | if (nla) { |
f35b794b | 708 | fib_cfg.fc_gw4 = nla_get_in_addr(nla); |
d73f80f9 DA |
709 | if (fib_cfg.fc_gw4) |
710 | fib_cfg.fc_gw_family = AF_INET; | |
d1566268 DA |
711 | } else if (nlav) { |
712 | ret = fib_gw_from_via(&fib_cfg, nlav, extack); | |
713 | if (ret) | |
714 | goto errout; | |
f35b794b | 715 | } |
e4516ef6 | 716 | |
4e902c57 | 717 | nla = nla_find(attrs, attrlen, RTA_FLOW); |
e4516ef6 DA |
718 | if (nla) |
719 | fib_cfg.fc_flow = nla_get_u32(nla); | |
720 | ||
721 | fib_cfg.fc_encap = nla_find(attrs, attrlen, RTA_ENCAP); | |
722 | nla = nla_find(attrs, attrlen, RTA_ENCAP_TYPE); | |
723 | if (nla) | |
724 | fib_cfg.fc_encap_type = nla_get_u16(nla); | |
1da177e4 | 725 | } |
4e902c57 | 726 | |
e4516ef6 DA |
727 | ret = fib_nh_init(net, nexthop_nh, &fib_cfg, |
728 | rtnh->rtnh_hops + 1, extack); | |
729 | if (ret) | |
730 | goto errout; | |
731 | ||
4e902c57 | 732 | rtnh = rtnh_next(rtnh, &remaining); |
1da177e4 | 733 | } endfor_nexthops(fi); |
4e902c57 | 734 | |
571e7226 | 735 | ret = -EINVAL; |
5481d73f DA |
736 | nh = fib_info_nh(fi, 0); |
737 | if (cfg->fc_oif && nh->fib_nh_oif != cfg->fc_oif) { | |
e4516ef6 DA |
738 | NL_SET_ERR_MSG(extack, |
739 | "Nexthop device index does not match RTA_OIF"); | |
740 | goto errout; | |
741 | } | |
f35b794b | 742 | if (cfg->fc_gw_family) { |
5481d73f | 743 | if (cfg->fc_gw_family != nh->fib_nh_gw_family || |
f35b794b | 744 | (cfg->fc_gw_family == AF_INET && |
5481d73f | 745 | nh->fib_nh_gw4 != cfg->fc_gw4) || |
a4ea5d43 | 746 | (cfg->fc_gw_family == AF_INET6 && |
5481d73f | 747 | ipv6_addr_cmp(&nh->fib_nh_gw6, &cfg->fc_gw6))) { |
f35b794b | 748 | NL_SET_ERR_MSG(extack, |
a4ea5d43 | 749 | "Nexthop gateway does not match RTA_GATEWAY or RTA_VIA"); |
f35b794b DA |
750 | goto errout; |
751 | } | |
e4516ef6 DA |
752 | } |
753 | #ifdef CONFIG_IP_ROUTE_CLASSID | |
5481d73f | 754 | if (cfg->fc_flow && nh->nh_tclassid != cfg->fc_flow) { |
e4516ef6 DA |
755 | NL_SET_ERR_MSG(extack, |
756 | "Nexthop class id does not match RTA_FLOW"); | |
757 | goto errout; | |
758 | } | |
759 | #endif | |
760 | ret = 0; | |
571e7226 RP |
761 | errout: |
762 | return ret; | |
1da177e4 LT |
763 | } |
764 | ||
4c7e8084 | 765 | /* only called when fib_nh is integrated into fib_info */ |
0e884c78 PN |
766 | static void fib_rebalance(struct fib_info *fi) |
767 | { | |
768 | int total; | |
769 | int w; | |
0e884c78 | 770 | |
5481d73f | 771 | if (fib_info_num_path(fi) < 2) |
0e884c78 PN |
772 | return; |
773 | ||
774 | total = 0; | |
775 | for_nexthops(fi) { | |
b75ed8b1 | 776 | if (nh->fib_nh_flags & RTNH_F_DEAD) |
0e884c78 PN |
777 | continue; |
778 | ||
b75ed8b1 DA |
779 | if (ip_ignore_linkdown(nh->fib_nh_dev) && |
780 | nh->fib_nh_flags & RTNH_F_LINKDOWN) | |
0e884c78 PN |
781 | continue; |
782 | ||
b75ed8b1 | 783 | total += nh->fib_nh_weight; |
0e884c78 PN |
784 | } endfor_nexthops(fi); |
785 | ||
786 | w = 0; | |
787 | change_nexthops(fi) { | |
788 | int upper_bound; | |
789 | ||
b75ed8b1 | 790 | if (nexthop_nh->fib_nh_flags & RTNH_F_DEAD) { |
0e884c78 | 791 | upper_bound = -1; |
b75ed8b1 DA |
792 | } else if (ip_ignore_linkdown(nexthop_nh->fib_nh_dev) && |
793 | nexthop_nh->fib_nh_flags & RTNH_F_LINKDOWN) { | |
0e884c78 PN |
794 | upper_bound = -1; |
795 | } else { | |
b75ed8b1 | 796 | w += nexthop_nh->fib_nh_weight; |
0a837fe4 PN |
797 | upper_bound = DIV_ROUND_CLOSEST_ULL((u64)w << 31, |
798 | total) - 1; | |
0e884c78 PN |
799 | } |
800 | ||
b75ed8b1 | 801 | atomic_set(&nexthop_nh->fib_nh_upper_bound, upper_bound); |
0e884c78 | 802 | } endfor_nexthops(fi); |
0e884c78 | 803 | } |
0e884c78 PN |
804 | #else /* CONFIG_IP_ROUTE_MULTIPATH */ |
805 | ||
8373c6c8 DA |
806 | static int fib_get_nhs(struct fib_info *fi, struct rtnexthop *rtnh, |
807 | int remaining, struct fib_config *cfg, | |
808 | struct netlink_ext_ack *extack) | |
809 | { | |
810 | NL_SET_ERR_MSG(extack, "Multipath support not enabled in kernel"); | |
811 | ||
812 | return -EINVAL; | |
813 | } | |
814 | ||
0e884c78 | 815 | #define fib_rebalance(fi) do { } while (0) |
0e884c78 PN |
816 | |
817 | #endif /* CONFIG_IP_ROUTE_MULTIPATH */ | |
1da177e4 | 818 | |
faee6769 | 819 | static int fib_encap_match(struct net *net, u16 encap_type, |
e01286ef | 820 | struct nlattr *encap, |
30357d7d | 821 | const struct fib_nh *nh, |
9ae28727 DA |
822 | const struct fib_config *cfg, |
823 | struct netlink_ext_ack *extack) | |
571e7226 RP |
824 | { |
825 | struct lwtunnel_state *lwtstate; | |
df383e62 | 826 | int ret, result = 0; |
571e7226 RP |
827 | |
828 | if (encap_type == LWTUNNEL_ENCAP_NONE) | |
829 | return 0; | |
830 | ||
faee6769 | 831 | ret = lwtunnel_build_state(net, encap_type, encap, AF_INET, |
9ae28727 | 832 | cfg, &lwtstate, extack); |
df383e62 | 833 | if (!ret) { |
b75ed8b1 | 834 | result = lwtunnel_cmp_encap(lwtstate, nh->fib_nh_lws); |
df383e62 JB |
835 | lwtstate_free(lwtstate); |
836 | } | |
571e7226 | 837 | |
df383e62 | 838 | return result; |
571e7226 RP |
839 | } |
840 | ||
faee6769 | 841 | int fib_nh_match(struct net *net, struct fib_config *cfg, struct fib_info *fi, |
9ae28727 | 842 | struct netlink_ext_ack *extack) |
1da177e4 LT |
843 | { |
844 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
4e902c57 TG |
845 | struct rtnexthop *rtnh; |
846 | int remaining; | |
1da177e4 LT |
847 | #endif |
848 | ||
4e902c57 | 849 | if (cfg->fc_priority && cfg->fc_priority != fi->fib_priority) |
1da177e4 LT |
850 | return 1; |
851 | ||
493ced1a DA |
852 | if (cfg->fc_nh_id) { |
853 | if (fi->nh && cfg->fc_nh_id == fi->nh->id) | |
854 | return 0; | |
855 | return 1; | |
856 | } | |
857 | ||
f35b794b | 858 | if (cfg->fc_oif || cfg->fc_gw_family) { |
5481d73f DA |
859 | struct fib_nh *nh = fib_info_nh(fi, 0); |
860 | ||
571e7226 | 861 | if (cfg->fc_encap) { |
faee6769 AA |
862 | if (fib_encap_match(net, cfg->fc_encap_type, |
863 | cfg->fc_encap, nh, cfg, extack)) | |
9ae28727 | 864 | return 1; |
571e7226 | 865 | } |
a8c6db1d SB |
866 | #ifdef CONFIG_IP_ROUTE_CLASSID |
867 | if (cfg->fc_flow && | |
5481d73f | 868 | cfg->fc_flow != nh->nh_tclassid) |
a8c6db1d SB |
869 | return 1; |
870 | #endif | |
5481d73f | 871 | if ((cfg->fc_oif && cfg->fc_oif != nh->fib_nh_oif) || |
f35b794b | 872 | (cfg->fc_gw_family && |
5481d73f | 873 | cfg->fc_gw_family != nh->fib_nh_gw_family)) |
f35b794b DA |
874 | return 1; |
875 | ||
876 | if (cfg->fc_gw_family == AF_INET && | |
5481d73f | 877 | cfg->fc_gw4 != nh->fib_nh_gw4) |
f35b794b DA |
878 | return 1; |
879 | ||
a4ea5d43 | 880 | if (cfg->fc_gw_family == AF_INET6 && |
5481d73f | 881 | ipv6_addr_cmp(&cfg->fc_gw6, &nh->fib_nh_gw6)) |
a4ea5d43 DA |
882 | return 1; |
883 | ||
f35b794b | 884 | return 0; |
1da177e4 LT |
885 | } |
886 | ||
887 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
51456b29 | 888 | if (!cfg->fc_mp) |
1da177e4 | 889 | return 0; |
4e902c57 TG |
890 | |
891 | rtnh = cfg->fc_mp; | |
892 | remaining = cfg->fc_mp_len; | |
e905a9ed | 893 | |
1da177e4 | 894 | for_nexthops(fi) { |
4e902c57 | 895 | int attrlen; |
1da177e4 | 896 | |
4e902c57 | 897 | if (!rtnh_ok(rtnh, remaining)) |
1da177e4 | 898 | return -EINVAL; |
4e902c57 | 899 | |
b75ed8b1 | 900 | if (rtnh->rtnh_ifindex && rtnh->rtnh_ifindex != nh->fib_nh_oif) |
1da177e4 | 901 | return 1; |
4e902c57 TG |
902 | |
903 | attrlen = rtnh_attrlen(rtnh); | |
f76936d0 | 904 | if (attrlen > 0) { |
d1566268 | 905 | struct nlattr *nla, *nlav, *attrs = rtnh_attrs(rtnh); |
4e902c57 TG |
906 | |
907 | nla = nla_find(attrs, attrlen, RTA_GATEWAY); | |
d1566268 DA |
908 | nlav = nla_find(attrs, attrlen, RTA_VIA); |
909 | if (nla && nlav) { | |
910 | NL_SET_ERR_MSG(extack, | |
911 | "Nexthop configuration can not contain both GATEWAY and VIA"); | |
912 | return -EINVAL; | |
913 | } | |
914 | ||
915 | if (nla) { | |
916 | if (nh->fib_nh_gw_family != AF_INET || | |
917 | nla_get_in_addr(nla) != nh->fib_nh_gw4) | |
918 | return 1; | |
919 | } else if (nlav) { | |
920 | struct fib_config cfg2; | |
921 | int err; | |
922 | ||
923 | err = fib_gw_from_via(&cfg2, nlav, extack); | |
924 | if (err) | |
925 | return err; | |
926 | ||
927 | switch (nh->fib_nh_gw_family) { | |
928 | case AF_INET: | |
929 | if (cfg2.fc_gw_family != AF_INET || | |
930 | cfg2.fc_gw4 != nh->fib_nh_gw4) | |
931 | return 1; | |
932 | break; | |
933 | case AF_INET6: | |
934 | if (cfg2.fc_gw_family != AF_INET6 || | |
935 | ipv6_addr_cmp(&cfg2.fc_gw6, | |
936 | &nh->fib_nh_gw6)) | |
937 | return 1; | |
938 | break; | |
939 | } | |
940 | } | |
941 | ||
c7066f70 | 942 | #ifdef CONFIG_IP_ROUTE_CLASSID |
4e902c57 TG |
943 | nla = nla_find(attrs, attrlen, RTA_FLOW); |
944 | if (nla && nla_get_u32(nla) != nh->nh_tclassid) | |
1da177e4 LT |
945 | return 1; |
946 | #endif | |
947 | } | |
4e902c57 TG |
948 | |
949 | rtnh = rtnh_next(rtnh, &remaining); | |
1da177e4 LT |
950 | } endfor_nexthops(fi); |
951 | #endif | |
952 | return 0; | |
953 | } | |
954 | ||
5f9ae3d9 XL |
955 | bool fib_metrics_match(struct fib_config *cfg, struct fib_info *fi) |
956 | { | |
957 | struct nlattr *nla; | |
958 | int remaining; | |
959 | ||
960 | if (!cfg->fc_mx) | |
961 | return true; | |
962 | ||
963 | nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) { | |
964 | int type = nla_type(nla); | |
d03a4557 | 965 | u32 fi_val, val; |
5f9ae3d9 XL |
966 | |
967 | if (!type) | |
968 | continue; | |
969 | if (type > RTAX_MAX) | |
970 | return false; | |
971 | ||
972 | if (type == RTAX_CC_ALGO) { | |
973 | char tmp[TCP_CA_NAME_MAX]; | |
974 | bool ecn_ca = false; | |
975 | ||
976 | nla_strlcpy(tmp, nla, sizeof(tmp)); | |
6670e152 | 977 | val = tcp_ca_get_key_by_name(fi->fib_net, tmp, &ecn_ca); |
5f9ae3d9 | 978 | } else { |
5b5e7a0d ED |
979 | if (nla_len(nla) != sizeof(u32)) |
980 | return false; | |
5f9ae3d9 XL |
981 | val = nla_get_u32(nla); |
982 | } | |
983 | ||
d03a4557 PS |
984 | fi_val = fi->fib_metrics->metrics[type - 1]; |
985 | if (type == RTAX_FEATURES) | |
986 | fi_val &= ~DST_FEATURE_ECN_CA; | |
987 | ||
988 | if (fi_val != val) | |
5f9ae3d9 XL |
989 | return false; |
990 | } | |
991 | ||
992 | return true; | |
993 | } | |
994 | ||
717a8f5b DA |
995 | static int fib_check_nh_v6_gw(struct net *net, struct fib_nh *nh, |
996 | u32 table, struct netlink_ext_ack *extack) | |
997 | { | |
998 | struct fib6_config cfg = { | |
999 | .fc_table = table, | |
1000 | .fc_flags = nh->fib_nh_flags | RTF_GATEWAY, | |
1001 | .fc_ifindex = nh->fib_nh_oif, | |
1002 | .fc_gateway = nh->fib_nh_gw6, | |
1003 | }; | |
1004 | struct fib6_nh fib6_nh = {}; | |
1005 | int err; | |
1006 | ||
1007 | err = ipv6_stub->fib6_nh_init(net, &fib6_nh, &cfg, GFP_KERNEL, extack); | |
1008 | if (!err) { | |
1009 | nh->fib_nh_dev = fib6_nh.fib_nh_dev; | |
1010 | dev_hold(nh->fib_nh_dev); | |
1011 | nh->fib_nh_oif = nh->fib_nh_dev->ifindex; | |
1012 | nh->fib_nh_scope = RT_SCOPE_LINK; | |
1013 | ||
1014 | ipv6_stub->fib6_nh_release(&fib6_nh); | |
1015 | } | |
1016 | ||
1017 | return err; | |
1018 | } | |
1da177e4 LT |
1019 | |
1020 | /* | |
6a31d2a9 ED |
1021 | * Picture |
1022 | * ------- | |
1023 | * | |
1024 | * Semantics of nexthop is very messy by historical reasons. | |
1025 | * We have to take into account, that: | |
1026 | * a) gateway can be actually local interface address, | |
1027 | * so that gatewayed route is direct. | |
1028 | * b) gateway must be on-link address, possibly | |
1029 | * described not by an ifaddr, but also by a direct route. | |
1030 | * c) If both gateway and interface are specified, they should not | |
1031 | * contradict. | |
1032 | * d) If we use tunnel routes, gateway could be not on-link. | |
1033 | * | |
1034 | * Attempt to reconcile all of these (alas, self-contradictory) conditions | |
1035 | * results in pretty ugly and hairy code with obscure logic. | |
1036 | * | |
1037 | * I chose to generalized it instead, so that the size | |
1038 | * of code does not increase practically, but it becomes | |
1039 | * much more general. | |
1040 | * Every prefix is assigned a "scope" value: "host" is local address, | |
1041 | * "link" is direct route, | |
1042 | * [ ... "site" ... "interior" ... ] | |
1043 | * and "universe" is true gateway route with global meaning. | |
1044 | * | |
1045 | * Every prefix refers to a set of "nexthop"s (gw, oif), | |
1046 | * where gw must have narrower scope. This recursion stops | |
1047 | * when gw has LOCAL scope or if "nexthop" is declared ONLINK, | |
1048 | * which means that gw is forced to be on link. | |
1049 | * | |
1050 | * Code is still hairy, but now it is apparently logically | |
1051 | * consistent and very flexible. F.e. as by-product it allows | |
1052 | * to co-exists in peace independent exterior and interior | |
1053 | * routing processes. | |
1054 | * | |
1055 | * Normally it looks as following. | |
1056 | * | |
1057 | * {universe prefix} -> (gw, oif) [scope link] | |
1058 | * | | |
1059 | * |-> {link prefix} -> (gw, oif) [scope local] | |
1060 | * | | |
1061 | * |-> {local prefix} (terminal node) | |
1da177e4 | 1062 | */ |
448d7248 DA |
1063 | static int fib_check_nh_v4_gw(struct net *net, struct fib_nh *nh, u32 table, |
1064 | u8 scope, struct netlink_ext_ack *extack) | |
1da177e4 | 1065 | { |
6a31d2a9 | 1066 | struct net_device *dev; |
448d7248 | 1067 | struct fib_result res; |
c3fee640 | 1068 | int err = 0; |
1da177e4 | 1069 | |
448d7248 DA |
1070 | if (nh->fib_nh_flags & RTNH_F_ONLINK) { |
1071 | unsigned int addr_type; | |
1da177e4 | 1072 | |
448d7248 DA |
1073 | if (scope >= RT_SCOPE_LINK) { |
1074 | NL_SET_ERR_MSG(extack, "Nexthop has invalid scope"); | |
1075 | return -EINVAL; | |
1da177e4 | 1076 | } |
448d7248 DA |
1077 | dev = __dev_get_by_index(net, nh->fib_nh_oif); |
1078 | if (!dev) { | |
1079 | NL_SET_ERR_MSG(extack, "Nexthop device required for onlink"); | |
1080 | return -ENODEV; | |
1da177e4 | 1081 | } |
448d7248 DA |
1082 | if (!(dev->flags & IFF_UP)) { |
1083 | NL_SET_ERR_MSG(extack, "Nexthop device is not up"); | |
1084 | return -ENETDOWN; | |
c3ab2b4e | 1085 | } |
448d7248 DA |
1086 | addr_type = inet_addr_type_dev_table(net, dev, nh->fib_nh_gw4); |
1087 | if (addr_type != RTN_UNICAST) { | |
1088 | NL_SET_ERR_MSG(extack, "Nexthop has invalid gateway"); | |
1089 | return -EINVAL; | |
c3ab2b4e | 1090 | } |
8a3d0316 | 1091 | if (!netif_carrier_ok(dev)) |
b75ed8b1 | 1092 | nh->fib_nh_flags |= RTNH_F_LINKDOWN; |
448d7248 DA |
1093 | nh->fib_nh_dev = dev; |
1094 | dev_hold(dev); | |
1095 | nh->fib_nh_scope = RT_SCOPE_LINK; | |
1096 | return 0; | |
1097 | } | |
1098 | rcu_read_lock(); | |
1099 | { | |
1100 | struct fib_table *tbl = NULL; | |
1101 | struct flowi4 fl4 = { | |
1102 | .daddr = nh->fib_nh_gw4, | |
1103 | .flowi4_scope = scope + 1, | |
1104 | .flowi4_oif = nh->fib_nh_oif, | |
1105 | .flowi4_iif = LOOPBACK_IFINDEX, | |
1106 | }; | |
1107 | ||
1108 | /* It is not necessary, but requires a bit of thinking */ | |
1109 | if (fl4.flowi4_scope < RT_SCOPE_LINK) | |
1110 | fl4.flowi4_scope = RT_SCOPE_LINK; | |
1111 | ||
1112 | if (table) | |
1113 | tbl = fib_get_table(net, table); | |
1114 | ||
1115 | if (tbl) | |
1116 | err = fib_table_lookup(tbl, &fl4, &res, | |
1117 | FIB_LOOKUP_IGNORE_LINKSTATE | | |
1118 | FIB_LOOKUP_NOREF); | |
1119 | ||
1120 | /* on error or if no table given do full lookup. This | |
1121 | * is needed for example when nexthops are in the local | |
1122 | * table rather than the given table | |
1123 | */ | |
1124 | if (!tbl || err) { | |
1125 | err = fib_lookup(net, &fl4, &res, | |
1126 | FIB_LOOKUP_IGNORE_LINKSTATE); | |
c3ab2b4e | 1127 | } |
448d7248 DA |
1128 | |
1129 | if (err) { | |
1130 | NL_SET_ERR_MSG(extack, "Nexthop has invalid gateway"); | |
8723e1b4 | 1131 | goto out; |
c3ab2b4e | 1132 | } |
1da177e4 | 1133 | } |
448d7248 DA |
1134 | |
1135 | err = -EINVAL; | |
1136 | if (res.type != RTN_UNICAST && res.type != RTN_LOCAL) { | |
1137 | NL_SET_ERR_MSG(extack, "Nexthop has invalid gateway"); | |
1138 | goto out; | |
1139 | } | |
1140 | nh->fib_nh_scope = res.scope; | |
1141 | nh->fib_nh_oif = FIB_RES_OIF(res); | |
1142 | nh->fib_nh_dev = dev = FIB_RES_DEV(res); | |
1143 | if (!dev) { | |
1144 | NL_SET_ERR_MSG(extack, | |
1145 | "No egress device for nexthop gateway"); | |
1146 | goto out; | |
1147 | } | |
1148 | dev_hold(dev); | |
1149 | if (!netif_carrier_ok(dev)) | |
1150 | nh->fib_nh_flags |= RTNH_F_LINKDOWN; | |
1151 | err = (dev->flags & IFF_UP) ? 0 : -ENETDOWN; | |
8723e1b4 ED |
1152 | out: |
1153 | rcu_read_unlock(); | |
1154 | return err; | |
1da177e4 | 1155 | } |
448d7248 DA |
1156 | |
1157 | static int fib_check_nh_nongw(struct net *net, struct fib_nh *nh, | |
1158 | struct netlink_ext_ack *extack) | |
1159 | { | |
1160 | struct in_device *in_dev; | |
1161 | int err; | |
1162 | ||
1163 | if (nh->fib_nh_flags & (RTNH_F_PERVASIVE | RTNH_F_ONLINK)) { | |
1164 | NL_SET_ERR_MSG(extack, | |
1165 | "Invalid flags for nexthop - PERVASIVE and ONLINK can not be set"); | |
1166 | return -EINVAL; | |
1167 | } | |
1168 | ||
1169 | rcu_read_lock(); | |
1170 | ||
1171 | err = -ENODEV; | |
1172 | in_dev = inetdev_by_index(net, nh->fib_nh_oif); | |
1173 | if (!in_dev) | |
1174 | goto out; | |
1175 | err = -ENETDOWN; | |
1176 | if (!(in_dev->dev->flags & IFF_UP)) { | |
1177 | NL_SET_ERR_MSG(extack, "Device for nexthop is not up"); | |
1178 | goto out; | |
1179 | } | |
1180 | ||
1181 | nh->fib_nh_dev = in_dev->dev; | |
1182 | dev_hold(nh->fib_nh_dev); | |
1183 | nh->fib_nh_scope = RT_SCOPE_HOST; | |
1184 | if (!netif_carrier_ok(nh->fib_nh_dev)) | |
1185 | nh->fib_nh_flags |= RTNH_F_LINKDOWN; | |
1186 | err = 0; | |
1187 | out: | |
1188 | rcu_read_unlock(); | |
1189 | return err; | |
1190 | } | |
1191 | ||
ac1fab2d DA |
1192 | int fib_check_nh(struct net *net, struct fib_nh *nh, u32 table, u8 scope, |
1193 | struct netlink_ext_ack *extack) | |
448d7248 | 1194 | { |
448d7248 DA |
1195 | int err; |
1196 | ||
1197 | if (nh->fib_nh_gw_family == AF_INET) | |
ac1fab2d | 1198 | err = fib_check_nh_v4_gw(net, nh, table, scope, extack); |
717a8f5b DA |
1199 | else if (nh->fib_nh_gw_family == AF_INET6) |
1200 | err = fib_check_nh_v6_gw(net, nh, table, extack); | |
448d7248 DA |
1201 | else |
1202 | err = fib_check_nh_nongw(net, nh, extack); | |
1203 | ||
1204 | return err; | |
1205 | } | |
1da177e4 | 1206 | |
81f7bf6c | 1207 | static inline unsigned int fib_laddr_hashfn(__be32 val) |
1da177e4 | 1208 | { |
123b9731 | 1209 | unsigned int mask = (fib_info_hash_size - 1); |
1da177e4 | 1210 | |
6a31d2a9 ED |
1211 | return ((__force u32)val ^ |
1212 | ((__force u32)val >> 7) ^ | |
1213 | ((__force u32)val >> 14)) & mask; | |
1da177e4 LT |
1214 | } |
1215 | ||
123b9731 | 1216 | static struct hlist_head *fib_info_hash_alloc(int bytes) |
1da177e4 LT |
1217 | { |
1218 | if (bytes <= PAGE_SIZE) | |
88f83491 | 1219 | return kzalloc(bytes, GFP_KERNEL); |
1da177e4 LT |
1220 | else |
1221 | return (struct hlist_head *) | |
6a31d2a9 ED |
1222 | __get_free_pages(GFP_KERNEL | __GFP_ZERO, |
1223 | get_order(bytes)); | |
1da177e4 LT |
1224 | } |
1225 | ||
123b9731 | 1226 | static void fib_info_hash_free(struct hlist_head *hash, int bytes) |
1da177e4 LT |
1227 | { |
1228 | if (!hash) | |
1229 | return; | |
1230 | ||
1231 | if (bytes <= PAGE_SIZE) | |
1232 | kfree(hash); | |
1233 | else | |
1234 | free_pages((unsigned long) hash, get_order(bytes)); | |
1235 | } | |
1236 | ||
123b9731 DM |
1237 | static void fib_info_hash_move(struct hlist_head *new_info_hash, |
1238 | struct hlist_head *new_laddrhash, | |
1239 | unsigned int new_size) | |
1da177e4 | 1240 | { |
b7656e7f | 1241 | struct hlist_head *old_info_hash, *old_laddrhash; |
123b9731 | 1242 | unsigned int old_size = fib_info_hash_size; |
b7656e7f | 1243 | unsigned int i, bytes; |
1da177e4 | 1244 | |
832b4c5e | 1245 | spin_lock_bh(&fib_info_lock); |
b7656e7f DM |
1246 | old_info_hash = fib_info_hash; |
1247 | old_laddrhash = fib_info_laddrhash; | |
123b9731 | 1248 | fib_info_hash_size = new_size; |
1da177e4 LT |
1249 | |
1250 | for (i = 0; i < old_size; i++) { | |
1251 | struct hlist_head *head = &fib_info_hash[i]; | |
b67bfe0d | 1252 | struct hlist_node *n; |
1da177e4 LT |
1253 | struct fib_info *fi; |
1254 | ||
b67bfe0d | 1255 | hlist_for_each_entry_safe(fi, n, head, fib_hash) { |
1da177e4 LT |
1256 | struct hlist_head *dest; |
1257 | unsigned int new_hash; | |
1258 | ||
1da177e4 LT |
1259 | new_hash = fib_info_hashfn(fi); |
1260 | dest = &new_info_hash[new_hash]; | |
1261 | hlist_add_head(&fi->fib_hash, dest); | |
1262 | } | |
1263 | } | |
1264 | fib_info_hash = new_info_hash; | |
1265 | ||
1266 | for (i = 0; i < old_size; i++) { | |
1267 | struct hlist_head *lhead = &fib_info_laddrhash[i]; | |
b67bfe0d | 1268 | struct hlist_node *n; |
1da177e4 LT |
1269 | struct fib_info *fi; |
1270 | ||
b67bfe0d | 1271 | hlist_for_each_entry_safe(fi, n, lhead, fib_lhash) { |
1da177e4 LT |
1272 | struct hlist_head *ldest; |
1273 | unsigned int new_hash; | |
1274 | ||
1da177e4 LT |
1275 | new_hash = fib_laddr_hashfn(fi->fib_prefsrc); |
1276 | ldest = &new_laddrhash[new_hash]; | |
1277 | hlist_add_head(&fi->fib_lhash, ldest); | |
1278 | } | |
1279 | } | |
1280 | fib_info_laddrhash = new_laddrhash; | |
1281 | ||
832b4c5e | 1282 | spin_unlock_bh(&fib_info_lock); |
b7656e7f DM |
1283 | |
1284 | bytes = old_size * sizeof(struct hlist_head *); | |
123b9731 DM |
1285 | fib_info_hash_free(old_info_hash, bytes); |
1286 | fib_info_hash_free(old_laddrhash, bytes); | |
1da177e4 LT |
1287 | } |
1288 | ||
dcb1ecb5 DA |
1289 | __be32 fib_info_update_nhc_saddr(struct net *net, struct fib_nh_common *nhc, |
1290 | unsigned char scope) | |
436c3b66 | 1291 | { |
dcb1ecb5 DA |
1292 | struct fib_nh *nh; |
1293 | ||
1294 | if (nhc->nhc_family != AF_INET) | |
1295 | return inet_select_addr(nhc->nhc_dev, 0, scope); | |
1296 | ||
1297 | nh = container_of(nhc, struct fib_nh, nh_common); | |
c3669486 | 1298 | nh->nh_saddr = inet_select_addr(nh->fib_nh_dev, nh->fib_nh_gw4, scope); |
436c3b66 DM |
1299 | nh->nh_saddr_genid = atomic_read(&net->ipv4.dev_addr_genid); |
1300 | ||
1301 | return nh->nh_saddr; | |
1302 | } | |
1303 | ||
eba618ab DA |
1304 | __be32 fib_result_prefsrc(struct net *net, struct fib_result *res) |
1305 | { | |
1306 | struct fib_nh_common *nhc = res->nhc; | |
eba618ab DA |
1307 | |
1308 | if (res->fi->fib_prefsrc) | |
1309 | return res->fi->fib_prefsrc; | |
1310 | ||
dcb1ecb5 DA |
1311 | if (nhc->nhc_family == AF_INET) { |
1312 | struct fib_nh *nh; | |
eba618ab | 1313 | |
dcb1ecb5 DA |
1314 | nh = container_of(nhc, struct fib_nh, nh_common); |
1315 | if (nh->nh_saddr_genid == atomic_read(&net->ipv4.dev_addr_genid)) | |
1316 | return nh->nh_saddr; | |
1317 | } | |
1318 | ||
1319 | return fib_info_update_nhc_saddr(net, nhc, res->fi->fib_scope); | |
eba618ab DA |
1320 | } |
1321 | ||
021dd3b8 DA |
1322 | static bool fib_valid_prefsrc(struct fib_config *cfg, __be32 fib_prefsrc) |
1323 | { | |
1324 | if (cfg->fc_type != RTN_LOCAL || !cfg->fc_dst || | |
1325 | fib_prefsrc != cfg->fc_dst) { | |
9b8ff518 | 1326 | u32 tb_id = cfg->fc_table; |
e1b8d903 | 1327 | int rc; |
021dd3b8 DA |
1328 | |
1329 | if (tb_id == RT_TABLE_MAIN) | |
1330 | tb_id = RT_TABLE_LOCAL; | |
1331 | ||
e1b8d903 DA |
1332 | rc = inet_addr_type_table(cfg->fc_nlinfo.nl_net, |
1333 | fib_prefsrc, tb_id); | |
1334 | ||
1335 | if (rc != RTN_LOCAL && tb_id != RT_TABLE_LOCAL) { | |
1336 | rc = inet_addr_type_table(cfg->fc_nlinfo.nl_net, | |
1337 | fib_prefsrc, RT_TABLE_LOCAL); | |
021dd3b8 | 1338 | } |
e1b8d903 DA |
1339 | |
1340 | if (rc != RTN_LOCAL) | |
1341 | return false; | |
021dd3b8 DA |
1342 | } |
1343 | return true; | |
1344 | } | |
1345 | ||
6d8422a1 DA |
1346 | struct fib_info *fib_create_info(struct fib_config *cfg, |
1347 | struct netlink_ext_ack *extack) | |
1da177e4 LT |
1348 | { |
1349 | int err; | |
1350 | struct fib_info *fi = NULL; | |
4c7e8084 | 1351 | struct nexthop *nh = NULL; |
1da177e4 | 1352 | struct fib_info *ofi; |
1da177e4 | 1353 | int nhs = 1; |
7462bd74 | 1354 | struct net *net = cfg->fc_nlinfo.nl_net; |
1da177e4 | 1355 | |
4c8237cd DM |
1356 | if (cfg->fc_type > RTN_MAX) |
1357 | goto err_inval; | |
1358 | ||
1da177e4 | 1359 | /* Fast check to catch the most weird cases */ |
c3ab2b4e DA |
1360 | if (fib_props[cfg->fc_type].scope > cfg->fc_scope) { |
1361 | NL_SET_ERR_MSG(extack, "Invalid scope"); | |
1da177e4 | 1362 | goto err_inval; |
c3ab2b4e | 1363 | } |
1da177e4 | 1364 | |
c3ab2b4e DA |
1365 | if (cfg->fc_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)) { |
1366 | NL_SET_ERR_MSG(extack, | |
1367 | "Invalid rtm_flags - can not contain DEAD or LINKDOWN"); | |
80610229 | 1368 | goto err_inval; |
c3ab2b4e | 1369 | } |
80610229 | 1370 | |
493ced1a | 1371 | if (cfg->fc_nh_id) { |
6c48ea5f DA |
1372 | if (!cfg->fc_mx) { |
1373 | fi = fib_find_info_nh(net, cfg); | |
1374 | if (fi) { | |
1375 | fi->fib_treeref++; | |
1376 | return fi; | |
1377 | } | |
1378 | } | |
1379 | ||
493ced1a DA |
1380 | nh = nexthop_find_by_id(net, cfg->fc_nh_id); |
1381 | if (!nh) { | |
1382 | NL_SET_ERR_MSG(extack, "Nexthop id does not exist"); | |
1383 | goto err_inval; | |
1384 | } | |
1385 | nhs = 0; | |
1386 | } | |
1387 | ||
1da177e4 | 1388 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
4e902c57 | 1389 | if (cfg->fc_mp) { |
6d8422a1 | 1390 | nhs = fib_count_nexthops(cfg->fc_mp, cfg->fc_mp_len, extack); |
1da177e4 LT |
1391 | if (nhs == 0) |
1392 | goto err_inval; | |
1393 | } | |
1394 | #endif | |
1da177e4 LT |
1395 | |
1396 | err = -ENOBUFS; | |
123b9731 DM |
1397 | if (fib_info_cnt >= fib_info_hash_size) { |
1398 | unsigned int new_size = fib_info_hash_size << 1; | |
1da177e4 LT |
1399 | struct hlist_head *new_info_hash; |
1400 | struct hlist_head *new_laddrhash; | |
1401 | unsigned int bytes; | |
1402 | ||
1403 | if (!new_size) | |
d94ce9b2 | 1404 | new_size = 16; |
1da177e4 | 1405 | bytes = new_size * sizeof(struct hlist_head *); |
123b9731 DM |
1406 | new_info_hash = fib_info_hash_alloc(bytes); |
1407 | new_laddrhash = fib_info_hash_alloc(bytes); | |
1da177e4 | 1408 | if (!new_info_hash || !new_laddrhash) { |
123b9731 DM |
1409 | fib_info_hash_free(new_info_hash, bytes); |
1410 | fib_info_hash_free(new_laddrhash, bytes); | |
88f83491 | 1411 | } else |
123b9731 | 1412 | fib_info_hash_move(new_info_hash, new_laddrhash, new_size); |
1da177e4 | 1413 | |
123b9731 | 1414 | if (!fib_info_hash_size) |
1da177e4 LT |
1415 | goto failure; |
1416 | } | |
1417 | ||
1f533ba6 | 1418 | fi = kzalloc(struct_size(fi, fib_nh, nhs), GFP_KERNEL); |
51456b29 | 1419 | if (!fi) |
1da177e4 | 1420 | goto failure; |
767a2217 | 1421 | fi->fib_metrics = ip_fib_metrics_init(fi->fib_net, cfg->fc_mx, |
d7e774f3 | 1422 | cfg->fc_mx_len, extack); |
88e235b8 | 1423 | if (IS_ERR(fi->fib_metrics)) { |
767a2217 DA |
1424 | err = PTR_ERR(fi->fib_metrics); |
1425 | kfree(fi); | |
1426 | return ERR_PTR(err); | |
187e5b3a | 1427 | } |
767a2217 | 1428 | |
187e5b3a | 1429 | fib_info_cnt++; |
efd7ef1c | 1430 | fi->fib_net = net; |
4e902c57 | 1431 | fi->fib_protocol = cfg->fc_protocol; |
37e826c5 | 1432 | fi->fib_scope = cfg->fc_scope; |
4e902c57 TG |
1433 | fi->fib_flags = cfg->fc_flags; |
1434 | fi->fib_priority = cfg->fc_priority; | |
1435 | fi->fib_prefsrc = cfg->fc_prefsrc; | |
f4ef85bb | 1436 | fi->fib_type = cfg->fc_type; |
5a56a0b3 | 1437 | fi->fib_tb_id = cfg->fc_table; |
1da177e4 LT |
1438 | |
1439 | fi->fib_nhs = nhs; | |
4c7e8084 DA |
1440 | if (nh) { |
1441 | if (!nexthop_get(nh)) { | |
1442 | NL_SET_ERR_MSG(extack, "Nexthop has been deleted"); | |
1443 | err = -EINVAL; | |
1444 | } else { | |
1445 | err = 0; | |
1446 | fi->nh = nh; | |
1447 | } | |
1448 | } else { | |
1449 | change_nexthops(fi) { | |
1450 | nexthop_nh->nh_parent = fi; | |
1451 | } endfor_nexthops(fi) | |
1da177e4 | 1452 | |
4c7e8084 DA |
1453 | if (cfg->fc_mp) |
1454 | err = fib_get_nhs(fi, cfg->fc_mp, cfg->fc_mp_len, cfg, | |
1455 | extack); | |
1456 | else | |
1457 | err = fib_nh_init(net, fi->fib_nh, cfg, 1, extack); | |
1458 | } | |
571e7226 | 1459 | |
e4516ef6 DA |
1460 | if (err != 0) |
1461 | goto failure; | |
1da177e4 | 1462 | |
4e902c57 | 1463 | if (fib_props[cfg->fc_type].error) { |
f35b794b | 1464 | if (cfg->fc_gw_family || cfg->fc_oif || cfg->fc_mp) { |
c3ab2b4e DA |
1465 | NL_SET_ERR_MSG(extack, |
1466 | "Gateway, device and multipath can not be specified for this route type"); | |
1da177e4 | 1467 | goto err_inval; |
c3ab2b4e | 1468 | } |
1da177e4 | 1469 | goto link_it; |
4c8237cd DM |
1470 | } else { |
1471 | switch (cfg->fc_type) { | |
1472 | case RTN_UNICAST: | |
1473 | case RTN_LOCAL: | |
1474 | case RTN_BROADCAST: | |
1475 | case RTN_ANYCAST: | |
1476 | case RTN_MULTICAST: | |
1477 | break; | |
1478 | default: | |
c3ab2b4e | 1479 | NL_SET_ERR_MSG(extack, "Invalid route type"); |
4c8237cd DM |
1480 | goto err_inval; |
1481 | } | |
1da177e4 LT |
1482 | } |
1483 | ||
c3ab2b4e DA |
1484 | if (cfg->fc_scope > RT_SCOPE_HOST) { |
1485 | NL_SET_ERR_MSG(extack, "Invalid scope"); | |
1da177e4 | 1486 | goto err_inval; |
c3ab2b4e | 1487 | } |
1da177e4 | 1488 | |
4c7e8084 DA |
1489 | if (fi->nh) { |
1490 | err = fib_check_nexthop(fi->nh, cfg->fc_scope, extack); | |
1491 | if (err) | |
1492 | goto failure; | |
1493 | } else if (cfg->fc_scope == RT_SCOPE_HOST) { | |
1da177e4 LT |
1494 | struct fib_nh *nh = fi->fib_nh; |
1495 | ||
1496 | /* Local address is added. */ | |
c3ab2b4e DA |
1497 | if (nhs != 1) { |
1498 | NL_SET_ERR_MSG(extack, | |
1499 | "Route with host scope can not have multiple nexthops"); | |
6d8422a1 | 1500 | goto err_inval; |
c3ab2b4e | 1501 | } |
bdf00467 | 1502 | if (nh->fib_nh_gw_family) { |
c3ab2b4e DA |
1503 | NL_SET_ERR_MSG(extack, |
1504 | "Route with host scope can not have a gateway"); | |
1da177e4 | 1505 | goto err_inval; |
c3ab2b4e | 1506 | } |
b75ed8b1 | 1507 | nh->fib_nh_scope = RT_SCOPE_NOWHERE; |
5481d73f | 1508 | nh->fib_nh_dev = dev_get_by_index(net, nh->fib_nh_oif); |
1da177e4 | 1509 | err = -ENODEV; |
b75ed8b1 | 1510 | if (!nh->fib_nh_dev) |
1da177e4 LT |
1511 | goto failure; |
1512 | } else { | |
8a3d0316 AG |
1513 | int linkdown = 0; |
1514 | ||
1da177e4 | 1515 | change_nexthops(fi) { |
ac1fab2d DA |
1516 | err = fib_check_nh(cfg->fc_nlinfo.nl_net, nexthop_nh, |
1517 | cfg->fc_table, cfg->fc_scope, | |
1518 | extack); | |
6a31d2a9 | 1519 | if (err != 0) |
1da177e4 | 1520 | goto failure; |
b75ed8b1 | 1521 | if (nexthop_nh->fib_nh_flags & RTNH_F_LINKDOWN) |
8a3d0316 | 1522 | linkdown++; |
1da177e4 | 1523 | } endfor_nexthops(fi) |
8a3d0316 AG |
1524 | if (linkdown == fi->fib_nhs) |
1525 | fi->fib_flags |= RTNH_F_LINKDOWN; | |
1da177e4 LT |
1526 | } |
1527 | ||
c3ab2b4e DA |
1528 | if (fi->fib_prefsrc && !fib_valid_prefsrc(cfg, fi->fib_prefsrc)) { |
1529 | NL_SET_ERR_MSG(extack, "Invalid prefsrc address"); | |
021dd3b8 | 1530 | goto err_inval; |
c3ab2b4e | 1531 | } |
1da177e4 | 1532 | |
4c7e8084 DA |
1533 | if (!fi->nh) { |
1534 | change_nexthops(fi) { | |
1535 | fib_info_update_nhc_saddr(net, &nexthop_nh->nh_common, | |
1536 | fi->fib_scope); | |
1537 | if (nexthop_nh->fib_nh_gw_family == AF_INET6) | |
1538 | fi->fib_nh_is_v6 = true; | |
1539 | } endfor_nexthops(fi) | |
1fc050a1 | 1540 | |
4c7e8084 DA |
1541 | fib_rebalance(fi); |
1542 | } | |
0e884c78 | 1543 | |
1da177e4 | 1544 | link_it: |
6a31d2a9 ED |
1545 | ofi = fib_find_info(fi); |
1546 | if (ofi) { | |
1da177e4 LT |
1547 | fi->fib_dead = 1; |
1548 | free_fib_info(fi); | |
1549 | ofi->fib_treeref++; | |
1550 | return ofi; | |
1551 | } | |
1552 | ||
1553 | fi->fib_treeref++; | |
0029c0de | 1554 | refcount_set(&fi->fib_clntref, 1); |
832b4c5e | 1555 | spin_lock_bh(&fib_info_lock); |
1da177e4 LT |
1556 | hlist_add_head(&fi->fib_hash, |
1557 | &fib_info_hash[fib_info_hashfn(fi)]); | |
1558 | if (fi->fib_prefsrc) { | |
1559 | struct hlist_head *head; | |
1560 | ||
1561 | head = &fib_info_laddrhash[fib_laddr_hashfn(fi->fib_prefsrc)]; | |
1562 | hlist_add_head(&fi->fib_lhash, head); | |
1563 | } | |
4c7e8084 DA |
1564 | if (fi->nh) { |
1565 | list_add(&fi->nh_list, &nh->fi_list); | |
1566 | } else { | |
1567 | change_nexthops(fi) { | |
1568 | struct hlist_head *head; | |
1569 | unsigned int hash; | |
1da177e4 | 1570 | |
4c7e8084 DA |
1571 | if (!nexthop_nh->fib_nh_dev) |
1572 | continue; | |
1573 | hash = fib_devindex_hashfn(nexthop_nh->fib_nh_dev->ifindex); | |
1574 | head = &fib_info_devhash[hash]; | |
1575 | hlist_add_head(&nexthop_nh->nh_hash, head); | |
1576 | } endfor_nexthops(fi) | |
1577 | } | |
832b4c5e | 1578 | spin_unlock_bh(&fib_info_lock); |
1da177e4 LT |
1579 | return fi; |
1580 | ||
1581 | err_inval: | |
1582 | err = -EINVAL; | |
1583 | ||
1584 | failure: | |
e905a9ed | 1585 | if (fi) { |
1da177e4 LT |
1586 | fi->fib_dead = 1; |
1587 | free_fib_info(fi); | |
1588 | } | |
4e902c57 TG |
1589 | |
1590 | return ERR_PTR(err); | |
1da177e4 LT |
1591 | } |
1592 | ||
c0a72077 | 1593 | int fib_nexthop_info(struct sk_buff *skb, const struct fib_nh_common *nhc, |
7bdf4de1 | 1594 | u8 rt_family, unsigned char *flags, bool skip_oif) |
b0f60193 | 1595 | { |
c2364199 | 1596 | if (nhc->nhc_flags & RTNH_F_DEAD) |
b0f60193 DA |
1597 | *flags |= RTNH_F_DEAD; |
1598 | ||
c2364199 | 1599 | if (nhc->nhc_flags & RTNH_F_LINKDOWN) { |
b0f60193 DA |
1600 | *flags |= RTNH_F_LINKDOWN; |
1601 | ||
1602 | rcu_read_lock(); | |
c2364199 DA |
1603 | switch (nhc->nhc_family) { |
1604 | case AF_INET: | |
1605 | if (ip_ignore_linkdown(nhc->nhc_dev)) | |
1606 | *flags |= RTNH_F_DEAD; | |
1607 | break; | |
c0a72077 DA |
1608 | case AF_INET6: |
1609 | if (ip6_ignore_linkdown(nhc->nhc_dev)) | |
1610 | *flags |= RTNH_F_DEAD; | |
1611 | break; | |
c2364199 | 1612 | } |
b0f60193 DA |
1613 | rcu_read_unlock(); |
1614 | } | |
1615 | ||
bdf00467 DA |
1616 | switch (nhc->nhc_gw_family) { |
1617 | case AF_INET: | |
1618 | if (nla_put_in_addr(skb, RTA_GATEWAY, nhc->nhc_gw.ipv4)) | |
1619 | goto nla_put_failure; | |
1620 | break; | |
1621 | case AF_INET6: | |
d1566268 DA |
1622 | /* if gateway family does not match nexthop family |
1623 | * gateway is encoded as RTA_VIA | |
1624 | */ | |
7bdf4de1 | 1625 | if (rt_family != nhc->nhc_gw_family) { |
d1566268 DA |
1626 | int alen = sizeof(struct in6_addr); |
1627 | struct nlattr *nla; | |
1628 | struct rtvia *via; | |
1629 | ||
1630 | nla = nla_reserve(skb, RTA_VIA, alen + 2); | |
1631 | if (!nla) | |
1632 | goto nla_put_failure; | |
1633 | ||
1634 | via = nla_data(nla); | |
1635 | via->rtvia_family = AF_INET6; | |
1636 | memcpy(via->rtvia_addr, &nhc->nhc_gw.ipv6, alen); | |
1637 | } else if (nla_put_in6_addr(skb, RTA_GATEWAY, | |
1638 | &nhc->nhc_gw.ipv6) < 0) { | |
bdf00467 | 1639 | goto nla_put_failure; |
d1566268 | 1640 | } |
bdf00467 | 1641 | break; |
c2364199 | 1642 | } |
b0f60193 | 1643 | |
c2364199 DA |
1644 | *flags |= (nhc->nhc_flags & RTNH_F_ONLINK); |
1645 | if (nhc->nhc_flags & RTNH_F_OFFLOAD) | |
b0f60193 DA |
1646 | *flags |= RTNH_F_OFFLOAD; |
1647 | ||
c2364199 DA |
1648 | if (!skip_oif && nhc->nhc_dev && |
1649 | nla_put_u32(skb, RTA_OIF, nhc->nhc_dev->ifindex)) | |
b0f60193 DA |
1650 | goto nla_put_failure; |
1651 | ||
c2364199 | 1652 | if (nhc->nhc_lwtstate && |
ffa8ce54 DA |
1653 | lwtunnel_fill_encap(skb, nhc->nhc_lwtstate, |
1654 | RTA_ENCAP, RTA_ENCAP_TYPE) < 0) | |
b0f60193 DA |
1655 | goto nla_put_failure; |
1656 | ||
1657 | return 0; | |
1658 | ||
1659 | nla_put_failure: | |
1660 | return -EMSGSIZE; | |
1661 | } | |
c0a72077 | 1662 | EXPORT_SYMBOL_GPL(fib_nexthop_info); |
b0f60193 | 1663 | |
c0a72077 DA |
1664 | #if IS_ENABLED(CONFIG_IP_ROUTE_MULTIPATH) || IS_ENABLED(CONFIG_IPV6) |
1665 | int fib_add_nexthop(struct sk_buff *skb, const struct fib_nh_common *nhc, | |
7bdf4de1 | 1666 | int nh_weight, u8 rt_family) |
b0f60193 | 1667 | { |
c2364199 | 1668 | const struct net_device *dev = nhc->nhc_dev; |
b0f60193 | 1669 | struct rtnexthop *rtnh; |
ecc5663c | 1670 | unsigned char flags = 0; |
b0f60193 DA |
1671 | |
1672 | rtnh = nla_reserve_nohdr(skb, sizeof(*rtnh)); | |
1673 | if (!rtnh) | |
1674 | goto nla_put_failure; | |
1675 | ||
c2364199 | 1676 | rtnh->rtnh_hops = nh_weight - 1; |
b0f60193 DA |
1677 | rtnh->rtnh_ifindex = dev ? dev->ifindex : 0; |
1678 | ||
7bdf4de1 | 1679 | if (fib_nexthop_info(skb, nhc, rt_family, &flags, true) < 0) |
b0f60193 DA |
1680 | goto nla_put_failure; |
1681 | ||
1682 | rtnh->rtnh_flags = flags; | |
1683 | ||
1684 | /* length of rtnetlink header + attributes */ | |
1685 | rtnh->rtnh_len = nlmsg_get_pos(skb) - (void *)rtnh; | |
1686 | ||
1687 | return 0; | |
1688 | ||
1689 | nla_put_failure: | |
1690 | return -EMSGSIZE; | |
1691 | } | |
c0a72077 | 1692 | EXPORT_SYMBOL_GPL(fib_add_nexthop); |
c2364199 | 1693 | #endif |
b0f60193 | 1694 | |
c2364199 | 1695 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
b0f60193 DA |
1696 | static int fib_add_multipath(struct sk_buff *skb, struct fib_info *fi) |
1697 | { | |
1698 | struct nlattr *mp; | |
1699 | ||
ae0be8de | 1700 | mp = nla_nest_start_noflag(skb, RTA_MULTIPATH); |
b0f60193 DA |
1701 | if (!mp) |
1702 | goto nla_put_failure; | |
1703 | ||
4c7e8084 | 1704 | if (unlikely(fi->nh)) { |
7bdf4de1 | 1705 | if (nexthop_mpath_fill_node(skb, fi->nh, AF_INET) < 0) |
4c7e8084 DA |
1706 | goto nla_put_failure; |
1707 | goto mp_end; | |
1708 | } | |
1709 | ||
b0f60193 | 1710 | for_nexthops(fi) { |
7bdf4de1 DS |
1711 | if (fib_add_nexthop(skb, &nh->nh_common, nh->fib_nh_weight, |
1712 | AF_INET) < 0) | |
b0f60193 DA |
1713 | goto nla_put_failure; |
1714 | #ifdef CONFIG_IP_ROUTE_CLASSID | |
1715 | if (nh->nh_tclassid && | |
1716 | nla_put_u32(skb, RTA_FLOW, nh->nh_tclassid)) | |
1717 | goto nla_put_failure; | |
1718 | #endif | |
1719 | } endfor_nexthops(fi); | |
1720 | ||
4c7e8084 | 1721 | mp_end: |
b0f60193 DA |
1722 | nla_nest_end(skb, mp); |
1723 | ||
1724 | return 0; | |
1725 | ||
1726 | nla_put_failure: | |
1727 | return -EMSGSIZE; | |
1728 | } | |
1729 | #else | |
1730 | static int fib_add_multipath(struct sk_buff *skb, struct fib_info *fi) | |
1731 | { | |
1732 | return 0; | |
1733 | } | |
1734 | #endif | |
1735 | ||
15e47304 | 1736 | int fib_dump_info(struct sk_buff *skb, u32 portid, u32 seq, int event, |
1e301fd0 | 1737 | struct fib_rt_info *fri, unsigned int flags) |
1da177e4 | 1738 | { |
1e301fd0 IS |
1739 | unsigned int nhs = fib_info_num_path(fri->fi); |
1740 | struct fib_info *fi = fri->fi; | |
1741 | u32 tb_id = fri->tb_id; | |
be403ea1 | 1742 | struct nlmsghdr *nlh; |
1da177e4 | 1743 | struct rtmsg *rtm; |
1da177e4 | 1744 | |
15e47304 | 1745 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*rtm), flags); |
51456b29 | 1746 | if (!nlh) |
26932566 | 1747 | return -EMSGSIZE; |
be403ea1 TG |
1748 | |
1749 | rtm = nlmsg_data(nlh); | |
1da177e4 | 1750 | rtm->rtm_family = AF_INET; |
1e301fd0 | 1751 | rtm->rtm_dst_len = fri->dst_len; |
1da177e4 | 1752 | rtm->rtm_src_len = 0; |
1e301fd0 | 1753 | rtm->rtm_tos = fri->tos; |
709772e6 KPO |
1754 | if (tb_id < 256) |
1755 | rtm->rtm_table = tb_id; | |
1756 | else | |
1757 | rtm->rtm_table = RT_TABLE_COMPAT; | |
f3756b79 DM |
1758 | if (nla_put_u32(skb, RTA_TABLE, tb_id)) |
1759 | goto nla_put_failure; | |
1e301fd0 | 1760 | rtm->rtm_type = fri->type; |
1da177e4 | 1761 | rtm->rtm_flags = fi->fib_flags; |
37e826c5 | 1762 | rtm->rtm_scope = fi->fib_scope; |
1da177e4 | 1763 | rtm->rtm_protocol = fi->fib_protocol; |
be403ea1 | 1764 | |
f3756b79 | 1765 | if (rtm->rtm_dst_len && |
1e301fd0 | 1766 | nla_put_in_addr(skb, RTA_DST, fri->dst)) |
f3756b79 DM |
1767 | goto nla_put_failure; |
1768 | if (fi->fib_priority && | |
1769 | nla_put_u32(skb, RTA_PRIORITY, fi->fib_priority)) | |
1770 | goto nla_put_failure; | |
3fb07daf | 1771 | if (rtnetlink_put_metrics(skb, fi->fib_metrics->metrics) < 0) |
be403ea1 TG |
1772 | goto nla_put_failure; |
1773 | ||
f3756b79 | 1774 | if (fi->fib_prefsrc && |
930345ea | 1775 | nla_put_in_addr(skb, RTA_PREFSRC, fi->fib_prefsrc)) |
f3756b79 | 1776 | goto nla_put_failure; |
4c7e8084 DA |
1777 | |
1778 | if (fi->nh) { | |
1779 | if (nla_put_u32(skb, RTA_NH_ID, fi->nh->id)) | |
1780 | goto nla_put_failure; | |
1781 | if (nexthop_is_blackhole(fi->nh)) | |
1782 | rtm->rtm_type = RTN_BLACKHOLE; | |
1783 | } | |
1784 | ||
5481d73f | 1785 | if (nhs == 1) { |
dcb1ecb5 | 1786 | const struct fib_nh_common *nhc = fib_info_nhc(fi, 0); |
ecc5663c | 1787 | unsigned char flags = 0; |
b0f60193 | 1788 | |
7bdf4de1 | 1789 | if (fib_nexthop_info(skb, nhc, AF_INET, &flags, false) < 0) |
f3756b79 | 1790 | goto nla_put_failure; |
b0f60193 DA |
1791 | |
1792 | rtm->rtm_flags = flags; | |
c7066f70 | 1793 | #ifdef CONFIG_IP_ROUTE_CLASSID |
dcb1ecb5 DA |
1794 | if (nhc->nhc_family == AF_INET) { |
1795 | struct fib_nh *nh; | |
1796 | ||
1797 | nh = container_of(nhc, struct fib_nh, nh_common); | |
1798 | if (nh->nh_tclassid && | |
1799 | nla_put_u32(skb, RTA_FLOW, nh->nh_tclassid)) | |
1800 | goto nla_put_failure; | |
1801 | } | |
8265abc0 | 1802 | #endif |
b0f60193 DA |
1803 | } else { |
1804 | if (fib_add_multipath(skb, fi) < 0) | |
ea7a8085 | 1805 | goto nla_put_failure; |
1da177e4 | 1806 | } |
1da177e4 | 1807 | |
90b93f1b IS |
1808 | if (fri->offload) |
1809 | rtm->rtm_flags |= RTM_F_OFFLOAD; | |
1810 | if (fri->trap) | |
1811 | rtm->rtm_flags |= RTM_F_TRAP; | |
1812 | ||
053c095a JB |
1813 | nlmsg_end(skb, nlh); |
1814 | return 0; | |
1da177e4 | 1815 | |
be403ea1 | 1816 | nla_put_failure: |
26932566 PM |
1817 | nlmsg_cancel(skb, nlh); |
1818 | return -EMSGSIZE; | |
1da177e4 LT |
1819 | } |
1820 | ||
1da177e4 | 1821 | /* |
6a31d2a9 ED |
1822 | * Update FIB if: |
1823 | * - local address disappeared -> we must delete all the entries | |
1824 | * referring to it. | |
1825 | * - device went down -> we must shutdown all nexthops going via it. | |
1da177e4 | 1826 | */ |
5a56a0b3 | 1827 | int fib_sync_down_addr(struct net_device *dev, __be32 local) |
1da177e4 LT |
1828 | { |
1829 | int ret = 0; | |
85326fa5 DL |
1830 | unsigned int hash = fib_laddr_hashfn(local); |
1831 | struct hlist_head *head = &fib_info_laddrhash[hash]; | |
e0a31262 | 1832 | int tb_id = l3mdev_fib_table(dev) ? : RT_TABLE_MAIN; |
5a56a0b3 | 1833 | struct net *net = dev_net(dev); |
85326fa5 | 1834 | struct fib_info *fi; |
1da177e4 | 1835 | |
51456b29 | 1836 | if (!fib_info_laddrhash || local == 0) |
85326fa5 | 1837 | return 0; |
1da177e4 | 1838 | |
b67bfe0d | 1839 | hlist_for_each_entry(fi, head, fib_lhash) { |
5a56a0b3 MT |
1840 | if (!net_eq(fi->fib_net, net) || |
1841 | fi->fib_tb_id != tb_id) | |
4814bdbd | 1842 | continue; |
85326fa5 DL |
1843 | if (fi->fib_prefsrc == local) { |
1844 | fi->fib_flags |= RTNH_F_DEAD; | |
1845 | ret++; | |
1da177e4 LT |
1846 | } |
1847 | } | |
85326fa5 DL |
1848 | return ret; |
1849 | } | |
1850 | ||
b75ed8b1 | 1851 | static int call_fib_nh_notifiers(struct fib_nh *nh, |
982acb97 IS |
1852 | enum fib_event_type event_type) |
1853 | { | |
b75ed8b1 | 1854 | bool ignore_link_down = ip_ignore_linkdown(nh->fib_nh_dev); |
982acb97 | 1855 | struct fib_nh_notifier_info info = { |
b75ed8b1 | 1856 | .fib_nh = nh, |
982acb97 IS |
1857 | }; |
1858 | ||
1859 | switch (event_type) { | |
1860 | case FIB_EVENT_NH_ADD: | |
b75ed8b1 | 1861 | if (nh->fib_nh_flags & RTNH_F_DEAD) |
982acb97 | 1862 | break; |
b75ed8b1 | 1863 | if (ignore_link_down && nh->fib_nh_flags & RTNH_F_LINKDOWN) |
982acb97 | 1864 | break; |
b75ed8b1 | 1865 | return call_fib4_notifiers(dev_net(nh->fib_nh_dev), event_type, |
04b1d4e5 | 1866 | &info.info); |
982acb97 | 1867 | case FIB_EVENT_NH_DEL: |
b75ed8b1 DA |
1868 | if ((ignore_link_down && nh->fib_nh_flags & RTNH_F_LINKDOWN) || |
1869 | (nh->fib_nh_flags & RTNH_F_DEAD)) | |
1870 | return call_fib4_notifiers(dev_net(nh->fib_nh_dev), | |
04b1d4e5 | 1871 | event_type, &info.info); |
982acb97 IS |
1872 | default: |
1873 | break; | |
1874 | } | |
1875 | ||
1876 | return NOTIFY_DONE; | |
1877 | } | |
1878 | ||
af7d6cce SD |
1879 | /* Update the PMTU of exceptions when: |
1880 | * - the new MTU of the first hop becomes smaller than the PMTU | |
1881 | * - the old MTU was the same as the PMTU, and it limited discovery of | |
1882 | * larger MTUs on the path. With that limit raised, we can now | |
1883 | * discover larger MTUs | |
1884 | * A special case is locked exceptions, for which the PMTU is smaller | |
1885 | * than the minimal accepted PMTU: | |
1886 | * - if the new MTU is greater than the PMTU, don't make any change | |
1887 | * - otherwise, unlock and set PMTU | |
1888 | */ | |
06c77c3e | 1889 | void fib_nhc_update_mtu(struct fib_nh_common *nhc, u32 new, u32 orig) |
af7d6cce SD |
1890 | { |
1891 | struct fnhe_hash_bucket *bucket; | |
1892 | int i; | |
1893 | ||
a5995e71 | 1894 | bucket = rcu_dereference_protected(nhc->nhc_exceptions, 1); |
af7d6cce SD |
1895 | if (!bucket) |
1896 | return; | |
1897 | ||
1898 | for (i = 0; i < FNHE_HASH_SIZE; i++) { | |
1899 | struct fib_nh_exception *fnhe; | |
1900 | ||
1901 | for (fnhe = rcu_dereference_protected(bucket[i].chain, 1); | |
1902 | fnhe; | |
1903 | fnhe = rcu_dereference_protected(fnhe->fnhe_next, 1)) { | |
1904 | if (fnhe->fnhe_mtu_locked) { | |
1905 | if (new <= fnhe->fnhe_pmtu) { | |
1906 | fnhe->fnhe_pmtu = new; | |
1907 | fnhe->fnhe_mtu_locked = false; | |
1908 | } | |
1909 | } else if (new < fnhe->fnhe_pmtu || | |
1910 | orig == fnhe->fnhe_pmtu) { | |
1911 | fnhe->fnhe_pmtu = new; | |
1912 | } | |
1913 | } | |
1914 | } | |
1915 | } | |
1916 | ||
1917 | void fib_sync_mtu(struct net_device *dev, u32 orig_mtu) | |
1918 | { | |
1919 | unsigned int hash = fib_devindex_hashfn(dev->ifindex); | |
1920 | struct hlist_head *head = &fib_info_devhash[hash]; | |
1921 | struct fib_nh *nh; | |
1922 | ||
1923 | hlist_for_each_entry(nh, head, nh_hash) { | |
b75ed8b1 | 1924 | if (nh->fib_nh_dev == dev) |
06c77c3e | 1925 | fib_nhc_update_mtu(&nh->nh_common, dev->mtu, orig_mtu); |
af7d6cce SD |
1926 | } |
1927 | } | |
1928 | ||
4f823def JA |
1929 | /* Event force Flags Description |
1930 | * NETDEV_CHANGE 0 LINKDOWN Carrier OFF, not for scope host | |
1931 | * NETDEV_DOWN 0 LINKDOWN|DEAD Link down, not for scope host | |
1932 | * NETDEV_DOWN 1 LINKDOWN|DEAD Last address removed | |
1933 | * NETDEV_UNREGISTER 1 LINKDOWN|DEAD Device removed | |
4c7e8084 DA |
1934 | * |
1935 | * only used when fib_nh is built into fib_info | |
4f823def JA |
1936 | */ |
1937 | int fib_sync_down_dev(struct net_device *dev, unsigned long event, bool force) | |
85326fa5 DL |
1938 | { |
1939 | int ret = 0; | |
1940 | int scope = RT_SCOPE_NOWHERE; | |
1941 | struct fib_info *prev_fi = NULL; | |
1942 | unsigned int hash = fib_devindex_hashfn(dev->ifindex); | |
1943 | struct hlist_head *head = &fib_info_devhash[hash]; | |
85326fa5 | 1944 | struct fib_nh *nh; |
1da177e4 | 1945 | |
4f823def | 1946 | if (force) |
85326fa5 | 1947 | scope = -1; |
1da177e4 | 1948 | |
b67bfe0d | 1949 | hlist_for_each_entry(nh, head, nh_hash) { |
85326fa5 DL |
1950 | struct fib_info *fi = nh->nh_parent; |
1951 | int dead; | |
1da177e4 | 1952 | |
85326fa5 | 1953 | BUG_ON(!fi->fib_nhs); |
b75ed8b1 | 1954 | if (nh->fib_nh_dev != dev || fi == prev_fi) |
85326fa5 DL |
1955 | continue; |
1956 | prev_fi = fi; | |
1957 | dead = 0; | |
1958 | change_nexthops(fi) { | |
b75ed8b1 | 1959 | if (nexthop_nh->fib_nh_flags & RTNH_F_DEAD) |
85326fa5 | 1960 | dead++; |
b75ed8b1 DA |
1961 | else if (nexthop_nh->fib_nh_dev == dev && |
1962 | nexthop_nh->fib_nh_scope != scope) { | |
8a3d0316 AG |
1963 | switch (event) { |
1964 | case NETDEV_DOWN: | |
1965 | case NETDEV_UNREGISTER: | |
b75ed8b1 | 1966 | nexthop_nh->fib_nh_flags |= RTNH_F_DEAD; |
a8eceea8 | 1967 | fallthrough; |
8a3d0316 | 1968 | case NETDEV_CHANGE: |
b75ed8b1 | 1969 | nexthop_nh->fib_nh_flags |= RTNH_F_LINKDOWN; |
8a3d0316 AG |
1970 | break; |
1971 | } | |
982acb97 IS |
1972 | call_fib_nh_notifiers(nexthop_nh, |
1973 | FIB_EVENT_NH_DEL); | |
85326fa5 DL |
1974 | dead++; |
1975 | } | |
1da177e4 | 1976 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
8a3d0316 | 1977 | if (event == NETDEV_UNREGISTER && |
b75ed8b1 | 1978 | nexthop_nh->fib_nh_dev == dev) { |
85326fa5 DL |
1979 | dead = fi->fib_nhs; |
1980 | break; | |
1da177e4 | 1981 | } |
85326fa5 DL |
1982 | #endif |
1983 | } endfor_nexthops(fi) | |
1984 | if (dead == fi->fib_nhs) { | |
8a3d0316 AG |
1985 | switch (event) { |
1986 | case NETDEV_DOWN: | |
1987 | case NETDEV_UNREGISTER: | |
1988 | fi->fib_flags |= RTNH_F_DEAD; | |
a8eceea8 | 1989 | fallthrough; |
8a3d0316 AG |
1990 | case NETDEV_CHANGE: |
1991 | fi->fib_flags |= RTNH_F_LINKDOWN; | |
1992 | break; | |
1993 | } | |
85326fa5 | 1994 | ret++; |
1da177e4 | 1995 | } |
0e884c78 PN |
1996 | |
1997 | fib_rebalance(fi); | |
1da177e4 LT |
1998 | } |
1999 | ||
2000 | return ret; | |
2001 | } | |
2002 | ||
0c838ff1 | 2003 | /* Must be invoked inside of an RCU protected region. */ |
c7b371e3 | 2004 | static void fib_select_default(const struct flowi4 *flp, struct fib_result *res) |
0c838ff1 DM |
2005 | { |
2006 | struct fib_info *fi = NULL, *last_resort = NULL; | |
56315f9e | 2007 | struct hlist_head *fa_head = res->fa_head; |
0c838ff1 | 2008 | struct fib_table *tb = res->table; |
18a912e9 | 2009 | u8 slen = 32 - res->prefixlen; |
0c838ff1 | 2010 | int order = -1, last_idx = -1; |
2392debc JA |
2011 | struct fib_alias *fa, *fa1 = NULL; |
2012 | u32 last_prio = res->fi->fib_priority; | |
2013 | u8 last_tos = 0; | |
0c838ff1 | 2014 | |
56315f9e | 2015 | hlist_for_each_entry_rcu(fa, fa_head, fa_list) { |
0c838ff1 | 2016 | struct fib_info *next_fi = fa->fa_info; |
7c74b0be | 2017 | struct fib_nh_common *nhc; |
0c838ff1 | 2018 | |
18a912e9 JA |
2019 | if (fa->fa_slen != slen) |
2020 | continue; | |
2392debc JA |
2021 | if (fa->fa_tos && fa->fa_tos != flp->flowi4_tos) |
2022 | continue; | |
18a912e9 JA |
2023 | if (fa->tb_id != tb->tb_id) |
2024 | continue; | |
2392debc JA |
2025 | if (next_fi->fib_priority > last_prio && |
2026 | fa->fa_tos == last_tos) { | |
2027 | if (last_tos) | |
2028 | continue; | |
2029 | break; | |
2030 | } | |
2031 | if (next_fi->fib_flags & RTNH_F_DEAD) | |
2032 | continue; | |
2033 | last_tos = fa->fa_tos; | |
2034 | last_prio = next_fi->fib_priority; | |
2035 | ||
37e826c5 | 2036 | if (next_fi->fib_scope != res->scope || |
0c838ff1 DM |
2037 | fa->fa_type != RTN_UNICAST) |
2038 | continue; | |
5481d73f | 2039 | |
7c74b0be DA |
2040 | nhc = fib_info_nhc(next_fi, 0); |
2041 | if (!nhc->nhc_gw_family || nhc->nhc_scope != RT_SCOPE_LINK) | |
0c838ff1 DM |
2042 | continue; |
2043 | ||
2044 | fib_alias_accessed(fa); | |
2045 | ||
51456b29 | 2046 | if (!fi) { |
0c838ff1 DM |
2047 | if (next_fi != res->fi) |
2048 | break; | |
2392debc | 2049 | fa1 = fa; |
0c838ff1 | 2050 | } else if (!fib_detect_death(fi, order, &last_resort, |
2392debc | 2051 | &last_idx, fa1->fa_default)) { |
0c838ff1 | 2052 | fib_result_assign(res, fi); |
2392debc | 2053 | fa1->fa_default = order; |
0c838ff1 DM |
2054 | goto out; |
2055 | } | |
2056 | fi = next_fi; | |
2057 | order++; | |
2058 | } | |
2059 | ||
51456b29 | 2060 | if (order <= 0 || !fi) { |
2392debc JA |
2061 | if (fa1) |
2062 | fa1->fa_default = -1; | |
0c838ff1 DM |
2063 | goto out; |
2064 | } | |
2065 | ||
2066 | if (!fib_detect_death(fi, order, &last_resort, &last_idx, | |
2392debc | 2067 | fa1->fa_default)) { |
0c838ff1 | 2068 | fib_result_assign(res, fi); |
2392debc | 2069 | fa1->fa_default = order; |
0c838ff1 DM |
2070 | goto out; |
2071 | } | |
2072 | ||
2073 | if (last_idx >= 0) | |
2074 | fib_result_assign(res, last_resort); | |
2392debc | 2075 | fa1->fa_default = last_idx; |
0c838ff1 | 2076 | out: |
31d40937 | 2077 | return; |
0c838ff1 DM |
2078 | } |
2079 | ||
1da177e4 | 2080 | /* |
6a31d2a9 ED |
2081 | * Dead device goes up. We wake up dead nexthops. |
2082 | * It takes sense only on multipath routes. | |
4c7e8084 DA |
2083 | * |
2084 | * only used when fib_nh is built into fib_info | |
1da177e4 | 2085 | */ |
ecc5663c | 2086 | int fib_sync_up(struct net_device *dev, unsigned char nh_flags) |
1da177e4 LT |
2087 | { |
2088 | struct fib_info *prev_fi; | |
2089 | unsigned int hash; | |
2090 | struct hlist_head *head; | |
1da177e4 LT |
2091 | struct fib_nh *nh; |
2092 | int ret; | |
2093 | ||
6a31d2a9 | 2094 | if (!(dev->flags & IFF_UP)) |
1da177e4 LT |
2095 | return 0; |
2096 | ||
c9b3292e JA |
2097 | if (nh_flags & RTNH_F_DEAD) { |
2098 | unsigned int flags = dev_get_flags(dev); | |
2099 | ||
2100 | if (flags & (IFF_RUNNING | IFF_LOWER_UP)) | |
2101 | nh_flags |= RTNH_F_LINKDOWN; | |
2102 | } | |
2103 | ||
1da177e4 LT |
2104 | prev_fi = NULL; |
2105 | hash = fib_devindex_hashfn(dev->ifindex); | |
2106 | head = &fib_info_devhash[hash]; | |
2107 | ret = 0; | |
2108 | ||
b67bfe0d | 2109 | hlist_for_each_entry(nh, head, nh_hash) { |
1da177e4 LT |
2110 | struct fib_info *fi = nh->nh_parent; |
2111 | int alive; | |
2112 | ||
2113 | BUG_ON(!fi->fib_nhs); | |
b75ed8b1 | 2114 | if (nh->fib_nh_dev != dev || fi == prev_fi) |
1da177e4 LT |
2115 | continue; |
2116 | ||
2117 | prev_fi = fi; | |
2118 | alive = 0; | |
2119 | change_nexthops(fi) { | |
b75ed8b1 | 2120 | if (!(nexthop_nh->fib_nh_flags & nh_flags)) { |
1da177e4 LT |
2121 | alive++; |
2122 | continue; | |
2123 | } | |
b75ed8b1 DA |
2124 | if (!nexthop_nh->fib_nh_dev || |
2125 | !(nexthop_nh->fib_nh_dev->flags & IFF_UP)) | |
1da177e4 | 2126 | continue; |
b75ed8b1 | 2127 | if (nexthop_nh->fib_nh_dev != dev || |
71fceff0 | 2128 | !__in_dev_get_rtnl(dev)) |
1da177e4 LT |
2129 | continue; |
2130 | alive++; | |
b75ed8b1 | 2131 | nexthop_nh->fib_nh_flags &= ~nh_flags; |
982acb97 | 2132 | call_fib_nh_notifiers(nexthop_nh, FIB_EVENT_NH_ADD); |
1da177e4 LT |
2133 | } endfor_nexthops(fi) |
2134 | ||
2135 | if (alive > 0) { | |
8a3d0316 | 2136 | fi->fib_flags &= ~nh_flags; |
1da177e4 LT |
2137 | ret++; |
2138 | } | |
0e884c78 PN |
2139 | |
2140 | fib_rebalance(fi); | |
1da177e4 LT |
2141 | } |
2142 | ||
2143 | return ret; | |
2144 | } | |
2145 | ||
8a3d0316 | 2146 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
a6db4494 DA |
2147 | static bool fib_good_nh(const struct fib_nh *nh) |
2148 | { | |
2149 | int state = NUD_REACHABLE; | |
2150 | ||
b75ed8b1 | 2151 | if (nh->fib_nh_scope == RT_SCOPE_LINK) { |
a6db4494 DA |
2152 | struct neighbour *n; |
2153 | ||
2154 | rcu_read_lock_bh(); | |
2155 | ||
1a38c43d DA |
2156 | if (likely(nh->fib_nh_gw_family == AF_INET)) |
2157 | n = __ipv4_neigh_lookup_noref(nh->fib_nh_dev, | |
2158 | (__force u32)nh->fib_nh_gw4); | |
2159 | else if (nh->fib_nh_gw_family == AF_INET6) | |
2160 | n = __ipv6_neigh_lookup_noref_stub(nh->fib_nh_dev, | |
2161 | &nh->fib_nh_gw6); | |
2162 | else | |
2163 | n = NULL; | |
a6db4494 DA |
2164 | if (n) |
2165 | state = n->nud_state; | |
2166 | ||
2167 | rcu_read_unlock_bh(); | |
2168 | } | |
2169 | ||
2170 | return !!(state & NUD_VALID); | |
2171 | } | |
8a3d0316 | 2172 | |
0e884c78 | 2173 | void fib_select_multipath(struct fib_result *res, int hash) |
1da177e4 LT |
2174 | { |
2175 | struct fib_info *fi = res->fi; | |
a6db4494 DA |
2176 | struct net *net = fi->fib_net; |
2177 | bool first = false; | |
1da177e4 | 2178 | |
4c7e8084 DA |
2179 | if (unlikely(res->fi->nh)) { |
2180 | nexthop_path_fib_result(res, hash); | |
2181 | return; | |
2182 | } | |
2183 | ||
eba618ab | 2184 | change_nexthops(fi) { |
6174a30d | 2185 | if (net->ipv4.sysctl_fib_multipath_use_neigh) { |
eba618ab | 2186 | if (!fib_good_nh(nexthop_nh)) |
6174a30d XL |
2187 | continue; |
2188 | if (!first) { | |
2189 | res->nh_sel = nhsel; | |
eba618ab | 2190 | res->nhc = &nexthop_nh->nh_common; |
6174a30d XL |
2191 | first = true; |
2192 | } | |
2193 | } | |
2194 | ||
eba618ab | 2195 | if (hash > atomic_read(&nexthop_nh->fib_nh_upper_bound)) |
0e884c78 | 2196 | continue; |
1da177e4 | 2197 | |
6174a30d | 2198 | res->nh_sel = nhsel; |
eba618ab | 2199 | res->nhc = &nexthop_nh->nh_common; |
6174a30d | 2200 | return; |
1da177e4 | 2201 | } endfor_nexthops(fi); |
1da177e4 LT |
2202 | } |
2203 | #endif | |
3ce58d84 DA |
2204 | |
2205 | void fib_select_path(struct net *net, struct fib_result *res, | |
bf4e0a3d | 2206 | struct flowi4 *fl4, const struct sk_buff *skb) |
3ce58d84 | 2207 | { |
0d876f2c DA |
2208 | if (fl4->flowi4_oif && !(fl4->flowi4_flags & FLOWI_FLAG_SKIP_NH_OIF)) |
2209 | goto check_saddr; | |
7a18c5b9 | 2210 | |
3ce58d84 | 2211 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
5481d73f | 2212 | if (fib_info_num_path(res->fi) > 1) { |
7efc0b6b | 2213 | int h = fib_multipath_hash(net, fl4, skb, NULL); |
9920e48b | 2214 | |
bf4e0a3d | 2215 | fib_select_multipath(res, h); |
3ce58d84 DA |
2216 | } |
2217 | else | |
2218 | #endif | |
2219 | if (!res->prefixlen && | |
2220 | res->table->tb_num_default > 1 && | |
0d876f2c | 2221 | res->type == RTN_UNICAST) |
3ce58d84 DA |
2222 | fib_select_default(fl4, res); |
2223 | ||
0d876f2c | 2224 | check_saddr: |
3ce58d84 | 2225 | if (!fl4->saddr) |
eba618ab | 2226 | fl4->saddr = fib_result_prefsrc(net, res); |
3ce58d84 | 2227 | } |