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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * xfrm_state.c | |
3 | * | |
4 | * Changes: | |
5 | * Mitsuru KANDA @USAGI | |
6 | * Kazunori MIYAZAWA @USAGI | |
7 | * Kunihiro Ishiguro <kunihiro@ipinfusion.com> | |
8 | * IPv6 support | |
9 | * YOSHIFUJI Hideaki @USAGI | |
10 | * Split up af-specific functions | |
11 | * Derek Atkins <derek@ihtfp.com> | |
12 | * Add UDP Encapsulation | |
df71837d | 13 | * |
1da177e4 LT |
14 | */ |
15 | ||
16 | #include <linux/workqueue.h> | |
17 | #include <net/xfrm.h> | |
18 | #include <linux/pfkeyv2.h> | |
19 | #include <linux/ipsec.h> | |
20 | #include <linux/module.h> | |
f034b5d4 | 21 | #include <linux/cache.h> |
68277acc | 22 | #include <linux/audit.h> |
b5890d8b | 23 | #include <asm/uaccess.h> |
1da177e4 | 24 | |
44e36b42 DM |
25 | #include "xfrm_hash.h" |
26 | ||
ee857a7d DM |
27 | struct sock *xfrm_nl; |
28 | EXPORT_SYMBOL(xfrm_nl); | |
29 | ||
01e67d08 | 30 | u32 sysctl_xfrm_aevent_etime __read_mostly = XFRM_AE_ETIME; |
a70fcb0b DM |
31 | EXPORT_SYMBOL(sysctl_xfrm_aevent_etime); |
32 | ||
01e67d08 | 33 | u32 sysctl_xfrm_aevent_rseqth __read_mostly = XFRM_AE_SEQT_SIZE; |
a70fcb0b DM |
34 | EXPORT_SYMBOL(sysctl_xfrm_aevent_rseqth); |
35 | ||
01e67d08 DM |
36 | u32 sysctl_xfrm_acq_expires __read_mostly = 30; |
37 | ||
1da177e4 LT |
38 | /* Each xfrm_state may be linked to two tables: |
39 | ||
40 | 1. Hash table by (spi,daddr,ah/esp) to find SA by SPI. (input,ctl) | |
a624c108 | 41 | 2. Hash table by (daddr,family,reqid) to find what SAs exist for given |
1da177e4 LT |
42 | destination/tunnel endpoint. (output) |
43 | */ | |
44 | ||
45 | static DEFINE_SPINLOCK(xfrm_state_lock); | |
46 | ||
f034b5d4 | 47 | static unsigned int xfrm_state_hashmax __read_mostly = 1 * 1024 * 1024; |
9d4a706d | 48 | static unsigned int xfrm_state_genid; |
f034b5d4 | 49 | |
17c2a42a HX |
50 | static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family); |
51 | static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo); | |
52 | ||
afeb14b4 PM |
53 | #ifdef CONFIG_AUDITSYSCALL |
54 | static void xfrm_audit_state_replay(struct xfrm_state *x, | |
55 | struct sk_buff *skb, __be32 net_seq); | |
56 | #else | |
57 | #define xfrm_audit_state_replay(x, s, sq) do { ; } while (0) | |
58 | #endif /* CONFIG_AUDITSYSCALL */ | |
59 | ||
64d0cd00 AD |
60 | static inline unsigned int xfrm_dst_hash(struct net *net, |
61 | xfrm_address_t *daddr, | |
c1969f29 DM |
62 | xfrm_address_t *saddr, |
63 | u32 reqid, | |
a624c108 | 64 | unsigned short family) |
f034b5d4 | 65 | { |
64d0cd00 | 66 | return __xfrm_dst_hash(daddr, saddr, reqid, family, net->xfrm.state_hmask); |
f034b5d4 DM |
67 | } |
68 | ||
64d0cd00 AD |
69 | static inline unsigned int xfrm_src_hash(struct net *net, |
70 | xfrm_address_t *daddr, | |
667bbcb6 | 71 | xfrm_address_t *saddr, |
44e36b42 | 72 | unsigned short family) |
f034b5d4 | 73 | { |
64d0cd00 | 74 | return __xfrm_src_hash(daddr, saddr, family, net->xfrm.state_hmask); |
f034b5d4 DM |
75 | } |
76 | ||
f034b5d4 | 77 | static inline unsigned int |
64d0cd00 | 78 | xfrm_spi_hash(struct net *net, xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family) |
f034b5d4 | 79 | { |
64d0cd00 | 80 | return __xfrm_spi_hash(daddr, spi, proto, family, net->xfrm.state_hmask); |
f034b5d4 DM |
81 | } |
82 | ||
f034b5d4 DM |
83 | static void xfrm_hash_transfer(struct hlist_head *list, |
84 | struct hlist_head *ndsttable, | |
85 | struct hlist_head *nsrctable, | |
86 | struct hlist_head *nspitable, | |
87 | unsigned int nhashmask) | |
88 | { | |
89 | struct hlist_node *entry, *tmp; | |
90 | struct xfrm_state *x; | |
91 | ||
92 | hlist_for_each_entry_safe(x, entry, tmp, list, bydst) { | |
93 | unsigned int h; | |
94 | ||
c1969f29 DM |
95 | h = __xfrm_dst_hash(&x->id.daddr, &x->props.saddr, |
96 | x->props.reqid, x->props.family, | |
97 | nhashmask); | |
f034b5d4 DM |
98 | hlist_add_head(&x->bydst, ndsttable+h); |
99 | ||
667bbcb6 MN |
100 | h = __xfrm_src_hash(&x->id.daddr, &x->props.saddr, |
101 | x->props.family, | |
f034b5d4 DM |
102 | nhashmask); |
103 | hlist_add_head(&x->bysrc, nsrctable+h); | |
104 | ||
7b4dc360 MN |
105 | if (x->id.spi) { |
106 | h = __xfrm_spi_hash(&x->id.daddr, x->id.spi, | |
107 | x->id.proto, x->props.family, | |
108 | nhashmask); | |
109 | hlist_add_head(&x->byspi, nspitable+h); | |
110 | } | |
f034b5d4 DM |
111 | } |
112 | } | |
113 | ||
63082733 | 114 | static unsigned long xfrm_hash_new_size(unsigned int state_hmask) |
f034b5d4 | 115 | { |
63082733 | 116 | return ((state_hmask + 1) << 1) * sizeof(struct hlist_head); |
f034b5d4 DM |
117 | } |
118 | ||
119 | static DEFINE_MUTEX(hash_resize_mutex); | |
120 | ||
63082733 | 121 | static void xfrm_hash_resize(struct work_struct *work) |
f034b5d4 | 122 | { |
63082733 | 123 | struct net *net = container_of(work, struct net, xfrm.state_hash_work); |
f034b5d4 DM |
124 | struct hlist_head *ndst, *nsrc, *nspi, *odst, *osrc, *ospi; |
125 | unsigned long nsize, osize; | |
126 | unsigned int nhashmask, ohashmask; | |
127 | int i; | |
128 | ||
129 | mutex_lock(&hash_resize_mutex); | |
130 | ||
63082733 | 131 | nsize = xfrm_hash_new_size(net->xfrm.state_hmask); |
44e36b42 | 132 | ndst = xfrm_hash_alloc(nsize); |
f034b5d4 DM |
133 | if (!ndst) |
134 | goto out_unlock; | |
44e36b42 | 135 | nsrc = xfrm_hash_alloc(nsize); |
f034b5d4 | 136 | if (!nsrc) { |
44e36b42 | 137 | xfrm_hash_free(ndst, nsize); |
f034b5d4 DM |
138 | goto out_unlock; |
139 | } | |
44e36b42 | 140 | nspi = xfrm_hash_alloc(nsize); |
f034b5d4 | 141 | if (!nspi) { |
44e36b42 DM |
142 | xfrm_hash_free(ndst, nsize); |
143 | xfrm_hash_free(nsrc, nsize); | |
f034b5d4 DM |
144 | goto out_unlock; |
145 | } | |
146 | ||
147 | spin_lock_bh(&xfrm_state_lock); | |
148 | ||
149 | nhashmask = (nsize / sizeof(struct hlist_head)) - 1U; | |
63082733 AD |
150 | for (i = net->xfrm.state_hmask; i >= 0; i--) |
151 | xfrm_hash_transfer(net->xfrm.state_bydst+i, ndst, nsrc, nspi, | |
f034b5d4 DM |
152 | nhashmask); |
153 | ||
63082733 AD |
154 | odst = net->xfrm.state_bydst; |
155 | osrc = net->xfrm.state_bysrc; | |
156 | ospi = net->xfrm.state_byspi; | |
157 | ohashmask = net->xfrm.state_hmask; | |
f034b5d4 | 158 | |
63082733 AD |
159 | net->xfrm.state_bydst = ndst; |
160 | net->xfrm.state_bysrc = nsrc; | |
161 | net->xfrm.state_byspi = nspi; | |
162 | net->xfrm.state_hmask = nhashmask; | |
f034b5d4 DM |
163 | |
164 | spin_unlock_bh(&xfrm_state_lock); | |
165 | ||
166 | osize = (ohashmask + 1) * sizeof(struct hlist_head); | |
44e36b42 DM |
167 | xfrm_hash_free(odst, osize); |
168 | xfrm_hash_free(osrc, osize); | |
169 | xfrm_hash_free(ospi, osize); | |
f034b5d4 DM |
170 | |
171 | out_unlock: | |
172 | mutex_unlock(&hash_resize_mutex); | |
173 | } | |
174 | ||
1da177e4 LT |
175 | static DEFINE_RWLOCK(xfrm_state_afinfo_lock); |
176 | static struct xfrm_state_afinfo *xfrm_state_afinfo[NPROTO]; | |
177 | ||
1da177e4 LT |
178 | static DEFINE_SPINLOCK(xfrm_state_gc_lock); |
179 | ||
53bc6b4d | 180 | int __xfrm_state_delete(struct xfrm_state *x); |
1da177e4 | 181 | |
980ebd25 | 182 | int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol); |
53bc6b4d | 183 | void km_state_expired(struct xfrm_state *x, int hard, u32 pid); |
1da177e4 | 184 | |
aa5d62cc HX |
185 | static struct xfrm_state_afinfo *xfrm_state_lock_afinfo(unsigned int family) |
186 | { | |
187 | struct xfrm_state_afinfo *afinfo; | |
188 | if (unlikely(family >= NPROTO)) | |
189 | return NULL; | |
190 | write_lock_bh(&xfrm_state_afinfo_lock); | |
191 | afinfo = xfrm_state_afinfo[family]; | |
192 | if (unlikely(!afinfo)) | |
193 | write_unlock_bh(&xfrm_state_afinfo_lock); | |
194 | return afinfo; | |
195 | } | |
196 | ||
197 | static void xfrm_state_unlock_afinfo(struct xfrm_state_afinfo *afinfo) | |
9a429c49 | 198 | __releases(xfrm_state_afinfo_lock) |
aa5d62cc HX |
199 | { |
200 | write_unlock_bh(&xfrm_state_afinfo_lock); | |
201 | } | |
202 | ||
533cb5b0 | 203 | int xfrm_register_type(const struct xfrm_type *type, unsigned short family) |
aa5d62cc HX |
204 | { |
205 | struct xfrm_state_afinfo *afinfo = xfrm_state_lock_afinfo(family); | |
533cb5b0 | 206 | const struct xfrm_type **typemap; |
aa5d62cc HX |
207 | int err = 0; |
208 | ||
209 | if (unlikely(afinfo == NULL)) | |
210 | return -EAFNOSUPPORT; | |
211 | typemap = afinfo->type_map; | |
212 | ||
213 | if (likely(typemap[type->proto] == NULL)) | |
214 | typemap[type->proto] = type; | |
215 | else | |
216 | err = -EEXIST; | |
217 | xfrm_state_unlock_afinfo(afinfo); | |
218 | return err; | |
219 | } | |
220 | EXPORT_SYMBOL(xfrm_register_type); | |
221 | ||
533cb5b0 | 222 | int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family) |
aa5d62cc HX |
223 | { |
224 | struct xfrm_state_afinfo *afinfo = xfrm_state_lock_afinfo(family); | |
533cb5b0 | 225 | const struct xfrm_type **typemap; |
aa5d62cc HX |
226 | int err = 0; |
227 | ||
228 | if (unlikely(afinfo == NULL)) | |
229 | return -EAFNOSUPPORT; | |
230 | typemap = afinfo->type_map; | |
231 | ||
232 | if (unlikely(typemap[type->proto] != type)) | |
233 | err = -ENOENT; | |
234 | else | |
235 | typemap[type->proto] = NULL; | |
236 | xfrm_state_unlock_afinfo(afinfo); | |
237 | return err; | |
238 | } | |
239 | EXPORT_SYMBOL(xfrm_unregister_type); | |
240 | ||
533cb5b0 | 241 | static const struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family) |
aa5d62cc HX |
242 | { |
243 | struct xfrm_state_afinfo *afinfo; | |
533cb5b0 ED |
244 | const struct xfrm_type **typemap; |
245 | const struct xfrm_type *type; | |
aa5d62cc HX |
246 | int modload_attempted = 0; |
247 | ||
248 | retry: | |
249 | afinfo = xfrm_state_get_afinfo(family); | |
250 | if (unlikely(afinfo == NULL)) | |
251 | return NULL; | |
252 | typemap = afinfo->type_map; | |
253 | ||
254 | type = typemap[proto]; | |
255 | if (unlikely(type && !try_module_get(type->owner))) | |
256 | type = NULL; | |
257 | if (!type && !modload_attempted) { | |
258 | xfrm_state_put_afinfo(afinfo); | |
259 | request_module("xfrm-type-%d-%d", family, proto); | |
260 | modload_attempted = 1; | |
261 | goto retry; | |
262 | } | |
263 | ||
264 | xfrm_state_put_afinfo(afinfo); | |
265 | return type; | |
266 | } | |
267 | ||
533cb5b0 | 268 | static void xfrm_put_type(const struct xfrm_type *type) |
aa5d62cc HX |
269 | { |
270 | module_put(type->owner); | |
271 | } | |
272 | ||
273 | int xfrm_register_mode(struct xfrm_mode *mode, int family) | |
274 | { | |
275 | struct xfrm_state_afinfo *afinfo; | |
276 | struct xfrm_mode **modemap; | |
277 | int err; | |
278 | ||
279 | if (unlikely(mode->encap >= XFRM_MODE_MAX)) | |
280 | return -EINVAL; | |
281 | ||
282 | afinfo = xfrm_state_lock_afinfo(family); | |
283 | if (unlikely(afinfo == NULL)) | |
284 | return -EAFNOSUPPORT; | |
285 | ||
286 | err = -EEXIST; | |
287 | modemap = afinfo->mode_map; | |
17c2a42a HX |
288 | if (modemap[mode->encap]) |
289 | goto out; | |
aa5d62cc | 290 | |
17c2a42a HX |
291 | err = -ENOENT; |
292 | if (!try_module_get(afinfo->owner)) | |
293 | goto out; | |
294 | ||
295 | mode->afinfo = afinfo; | |
296 | modemap[mode->encap] = mode; | |
297 | err = 0; | |
298 | ||
299 | out: | |
aa5d62cc HX |
300 | xfrm_state_unlock_afinfo(afinfo); |
301 | return err; | |
302 | } | |
303 | EXPORT_SYMBOL(xfrm_register_mode); | |
304 | ||
305 | int xfrm_unregister_mode(struct xfrm_mode *mode, int family) | |
306 | { | |
307 | struct xfrm_state_afinfo *afinfo; | |
308 | struct xfrm_mode **modemap; | |
309 | int err; | |
310 | ||
311 | if (unlikely(mode->encap >= XFRM_MODE_MAX)) | |
312 | return -EINVAL; | |
313 | ||
314 | afinfo = xfrm_state_lock_afinfo(family); | |
315 | if (unlikely(afinfo == NULL)) | |
316 | return -EAFNOSUPPORT; | |
317 | ||
318 | err = -ENOENT; | |
319 | modemap = afinfo->mode_map; | |
320 | if (likely(modemap[mode->encap] == mode)) { | |
321 | modemap[mode->encap] = NULL; | |
17c2a42a | 322 | module_put(mode->afinfo->owner); |
aa5d62cc HX |
323 | err = 0; |
324 | } | |
325 | ||
326 | xfrm_state_unlock_afinfo(afinfo); | |
327 | return err; | |
328 | } | |
329 | EXPORT_SYMBOL(xfrm_unregister_mode); | |
330 | ||
331 | static struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family) | |
332 | { | |
333 | struct xfrm_state_afinfo *afinfo; | |
334 | struct xfrm_mode *mode; | |
335 | int modload_attempted = 0; | |
336 | ||
337 | if (unlikely(encap >= XFRM_MODE_MAX)) | |
338 | return NULL; | |
339 | ||
340 | retry: | |
341 | afinfo = xfrm_state_get_afinfo(family); | |
342 | if (unlikely(afinfo == NULL)) | |
343 | return NULL; | |
344 | ||
345 | mode = afinfo->mode_map[encap]; | |
346 | if (unlikely(mode && !try_module_get(mode->owner))) | |
347 | mode = NULL; | |
348 | if (!mode && !modload_attempted) { | |
349 | xfrm_state_put_afinfo(afinfo); | |
350 | request_module("xfrm-mode-%d-%d", family, encap); | |
351 | modload_attempted = 1; | |
352 | goto retry; | |
353 | } | |
354 | ||
355 | xfrm_state_put_afinfo(afinfo); | |
356 | return mode; | |
357 | } | |
358 | ||
359 | static void xfrm_put_mode(struct xfrm_mode *mode) | |
360 | { | |
361 | module_put(mode->owner); | |
362 | } | |
363 | ||
1da177e4 LT |
364 | static void xfrm_state_gc_destroy(struct xfrm_state *x) |
365 | { | |
a47f0ce0 DM |
366 | del_timer_sync(&x->timer); |
367 | del_timer_sync(&x->rtimer); | |
a51482bd JJ |
368 | kfree(x->aalg); |
369 | kfree(x->ealg); | |
370 | kfree(x->calg); | |
371 | kfree(x->encap); | |
060f02a3 | 372 | kfree(x->coaddr); |
13996378 HX |
373 | if (x->inner_mode) |
374 | xfrm_put_mode(x->inner_mode); | |
df9dcb45 KM |
375 | if (x->inner_mode_iaf) |
376 | xfrm_put_mode(x->inner_mode_iaf); | |
13996378 HX |
377 | if (x->outer_mode) |
378 | xfrm_put_mode(x->outer_mode); | |
1da177e4 LT |
379 | if (x->type) { |
380 | x->type->destructor(x); | |
381 | xfrm_put_type(x->type); | |
382 | } | |
df71837d | 383 | security_xfrm_state_free(x); |
1da177e4 LT |
384 | kfree(x); |
385 | } | |
386 | ||
c7837144 | 387 | static void xfrm_state_gc_task(struct work_struct *work) |
1da177e4 | 388 | { |
c7837144 | 389 | struct net *net = container_of(work, struct net, xfrm.state_gc_work); |
12a169e7 HX |
390 | struct xfrm_state *x; |
391 | struct hlist_node *entry, *tmp; | |
392 | struct hlist_head gc_list; | |
1da177e4 | 393 | |
1da177e4 | 394 | spin_lock_bh(&xfrm_state_gc_lock); |
c7837144 | 395 | hlist_move_list(&net->xfrm.state_gc_list, &gc_list); |
1da177e4 LT |
396 | spin_unlock_bh(&xfrm_state_gc_lock); |
397 | ||
12a169e7 | 398 | hlist_for_each_entry_safe(x, entry, tmp, &gc_list, gclist) |
1da177e4 | 399 | xfrm_state_gc_destroy(x); |
8f126e37 | 400 | |
50a30657 | 401 | wake_up(&net->xfrm.km_waitq); |
1da177e4 LT |
402 | } |
403 | ||
404 | static inline unsigned long make_jiffies(long secs) | |
405 | { | |
406 | if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ) | |
407 | return MAX_SCHEDULE_TIMEOUT-1; | |
408 | else | |
a716c119 | 409 | return secs*HZ; |
1da177e4 LT |
410 | } |
411 | ||
412 | static void xfrm_timer_handler(unsigned long data) | |
413 | { | |
414 | struct xfrm_state *x = (struct xfrm_state*)data; | |
9d729f72 | 415 | unsigned long now = get_seconds(); |
1da177e4 LT |
416 | long next = LONG_MAX; |
417 | int warn = 0; | |
161a09e7 | 418 | int err = 0; |
1da177e4 LT |
419 | |
420 | spin_lock(&x->lock); | |
421 | if (x->km.state == XFRM_STATE_DEAD) | |
422 | goto out; | |
423 | if (x->km.state == XFRM_STATE_EXPIRED) | |
424 | goto expired; | |
425 | if (x->lft.hard_add_expires_seconds) { | |
426 | long tmo = x->lft.hard_add_expires_seconds + | |
427 | x->curlft.add_time - now; | |
428 | if (tmo <= 0) | |
429 | goto expired; | |
430 | if (tmo < next) | |
431 | next = tmo; | |
432 | } | |
433 | if (x->lft.hard_use_expires_seconds) { | |
434 | long tmo = x->lft.hard_use_expires_seconds + | |
435 | (x->curlft.use_time ? : now) - now; | |
436 | if (tmo <= 0) | |
437 | goto expired; | |
438 | if (tmo < next) | |
439 | next = tmo; | |
440 | } | |
441 | if (x->km.dying) | |
442 | goto resched; | |
443 | if (x->lft.soft_add_expires_seconds) { | |
444 | long tmo = x->lft.soft_add_expires_seconds + | |
445 | x->curlft.add_time - now; | |
446 | if (tmo <= 0) | |
447 | warn = 1; | |
448 | else if (tmo < next) | |
449 | next = tmo; | |
450 | } | |
451 | if (x->lft.soft_use_expires_seconds) { | |
452 | long tmo = x->lft.soft_use_expires_seconds + | |
453 | (x->curlft.use_time ? : now) - now; | |
454 | if (tmo <= 0) | |
455 | warn = 1; | |
456 | else if (tmo < next) | |
457 | next = tmo; | |
458 | } | |
459 | ||
4666faab | 460 | x->km.dying = warn; |
1da177e4 | 461 | if (warn) |
53bc6b4d | 462 | km_state_expired(x, 0, 0); |
1da177e4 | 463 | resched: |
a47f0ce0 DM |
464 | if (next != LONG_MAX) |
465 | mod_timer(&x->timer, jiffies + make_jiffies(next)); | |
466 | ||
1da177e4 LT |
467 | goto out; |
468 | ||
469 | expired: | |
470 | if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0) { | |
471 | x->km.state = XFRM_STATE_EXPIRED; | |
50a30657 | 472 | wake_up(&init_net.xfrm.km_waitq); |
1da177e4 LT |
473 | next = 2; |
474 | goto resched; | |
475 | } | |
161a09e7 JL |
476 | |
477 | err = __xfrm_state_delete(x); | |
478 | if (!err && x->id.spi) | |
53bc6b4d | 479 | km_state_expired(x, 1, 0); |
1da177e4 | 480 | |
ab5f5e8b | 481 | xfrm_audit_state_delete(x, err ? 0 : 1, |
2532386f EP |
482 | audit_get_loginuid(current), |
483 | audit_get_sessionid(current), 0); | |
161a09e7 | 484 | |
1da177e4 LT |
485 | out: |
486 | spin_unlock(&x->lock); | |
1da177e4 LT |
487 | } |
488 | ||
0ac84752 DM |
489 | static void xfrm_replay_timer_handler(unsigned long data); |
490 | ||
673c09be | 491 | struct xfrm_state *xfrm_state_alloc(struct net *net) |
1da177e4 LT |
492 | { |
493 | struct xfrm_state *x; | |
494 | ||
0da974f4 | 495 | x = kzalloc(sizeof(struct xfrm_state), GFP_ATOMIC); |
1da177e4 LT |
496 | |
497 | if (x) { | |
673c09be | 498 | write_pnet(&x->xs_net, net); |
1da177e4 LT |
499 | atomic_set(&x->refcnt, 1); |
500 | atomic_set(&x->tunnel_users, 0); | |
12a169e7 | 501 | INIT_LIST_HEAD(&x->km.all); |
8f126e37 DM |
502 | INIT_HLIST_NODE(&x->bydst); |
503 | INIT_HLIST_NODE(&x->bysrc); | |
504 | INIT_HLIST_NODE(&x->byspi); | |
b24b8a24 PE |
505 | setup_timer(&x->timer, xfrm_timer_handler, (unsigned long)x); |
506 | setup_timer(&x->rtimer, xfrm_replay_timer_handler, | |
507 | (unsigned long)x); | |
9d729f72 | 508 | x->curlft.add_time = get_seconds(); |
1da177e4 LT |
509 | x->lft.soft_byte_limit = XFRM_INF; |
510 | x->lft.soft_packet_limit = XFRM_INF; | |
511 | x->lft.hard_byte_limit = XFRM_INF; | |
512 | x->lft.hard_packet_limit = XFRM_INF; | |
f8cd5488 JHS |
513 | x->replay_maxage = 0; |
514 | x->replay_maxdiff = 0; | |
df9dcb45 KM |
515 | x->inner_mode = NULL; |
516 | x->inner_mode_iaf = NULL; | |
1da177e4 LT |
517 | spin_lock_init(&x->lock); |
518 | } | |
519 | return x; | |
520 | } | |
521 | EXPORT_SYMBOL(xfrm_state_alloc); | |
522 | ||
523 | void __xfrm_state_destroy(struct xfrm_state *x) | |
524 | { | |
547b792c | 525 | WARN_ON(x->km.state != XFRM_STATE_DEAD); |
1da177e4 LT |
526 | |
527 | spin_lock_bh(&xfrm_state_gc_lock); | |
b8a0ae20 | 528 | hlist_add_head(&x->gclist, &init_net.xfrm.state_gc_list); |
1da177e4 | 529 | spin_unlock_bh(&xfrm_state_gc_lock); |
c7837144 | 530 | schedule_work(&init_net.xfrm.state_gc_work); |
1da177e4 LT |
531 | } |
532 | EXPORT_SYMBOL(__xfrm_state_destroy); | |
533 | ||
53bc6b4d | 534 | int __xfrm_state_delete(struct xfrm_state *x) |
1da177e4 | 535 | { |
26b15dad JHS |
536 | int err = -ESRCH; |
537 | ||
1da177e4 LT |
538 | if (x->km.state != XFRM_STATE_DEAD) { |
539 | x->km.state = XFRM_STATE_DEAD; | |
540 | spin_lock(&xfrm_state_lock); | |
12a169e7 | 541 | list_del(&x->km.all); |
8f126e37 | 542 | hlist_del(&x->bydst); |
8f126e37 | 543 | hlist_del(&x->bysrc); |
a47f0ce0 | 544 | if (x->id.spi) |
8f126e37 | 545 | hlist_del(&x->byspi); |
0bf7c5b0 | 546 | init_net.xfrm.state_num--; |
1da177e4 | 547 | spin_unlock(&xfrm_state_lock); |
1da177e4 | 548 | |
1da177e4 LT |
549 | /* All xfrm_state objects are created by xfrm_state_alloc. |
550 | * The xfrm_state_alloc call gives a reference, and that | |
551 | * is what we are dropping here. | |
552 | */ | |
5dba4797 | 553 | xfrm_state_put(x); |
26b15dad | 554 | err = 0; |
1da177e4 | 555 | } |
26b15dad JHS |
556 | |
557 | return err; | |
1da177e4 | 558 | } |
53bc6b4d | 559 | EXPORT_SYMBOL(__xfrm_state_delete); |
1da177e4 | 560 | |
26b15dad | 561 | int xfrm_state_delete(struct xfrm_state *x) |
1da177e4 | 562 | { |
26b15dad JHS |
563 | int err; |
564 | ||
1da177e4 | 565 | spin_lock_bh(&x->lock); |
26b15dad | 566 | err = __xfrm_state_delete(x); |
1da177e4 | 567 | spin_unlock_bh(&x->lock); |
26b15dad JHS |
568 | |
569 | return err; | |
1da177e4 LT |
570 | } |
571 | EXPORT_SYMBOL(xfrm_state_delete); | |
572 | ||
4aa2e62c JL |
573 | #ifdef CONFIG_SECURITY_NETWORK_XFRM |
574 | static inline int | |
575 | xfrm_state_flush_secctx_check(u8 proto, struct xfrm_audit *audit_info) | |
1da177e4 | 576 | { |
4aa2e62c JL |
577 | int i, err = 0; |
578 | ||
529983ec | 579 | for (i = 0; i <= init_net.xfrm.state_hmask; i++) { |
4aa2e62c JL |
580 | struct hlist_node *entry; |
581 | struct xfrm_state *x; | |
582 | ||
73d189dc | 583 | hlist_for_each_entry(x, entry, init_net.xfrm.state_bydst+i, bydst) { |
4aa2e62c JL |
584 | if (xfrm_id_proto_match(x->id.proto, proto) && |
585 | (err = security_xfrm_state_delete(x)) != 0) { | |
ab5f5e8b JL |
586 | xfrm_audit_state_delete(x, 0, |
587 | audit_info->loginuid, | |
2532386f | 588 | audit_info->sessionid, |
ab5f5e8b | 589 | audit_info->secid); |
4aa2e62c JL |
590 | return err; |
591 | } | |
592 | } | |
593 | } | |
594 | ||
595 | return err; | |
596 | } | |
597 | #else | |
598 | static inline int | |
599 | xfrm_state_flush_secctx_check(u8 proto, struct xfrm_audit *audit_info) | |
600 | { | |
601 | return 0; | |
602 | } | |
603 | #endif | |
604 | ||
605 | int xfrm_state_flush(u8 proto, struct xfrm_audit *audit_info) | |
606 | { | |
607 | int i, err = 0; | |
1da177e4 LT |
608 | |
609 | spin_lock_bh(&xfrm_state_lock); | |
4aa2e62c JL |
610 | err = xfrm_state_flush_secctx_check(proto, audit_info); |
611 | if (err) | |
612 | goto out; | |
613 | ||
529983ec | 614 | for (i = 0; i <= init_net.xfrm.state_hmask; i++) { |
8f126e37 DM |
615 | struct hlist_node *entry; |
616 | struct xfrm_state *x; | |
1da177e4 | 617 | restart: |
73d189dc | 618 | hlist_for_each_entry(x, entry, init_net.xfrm.state_bydst+i, bydst) { |
1da177e4 | 619 | if (!xfrm_state_kern(x) && |
5794708f | 620 | xfrm_id_proto_match(x->id.proto, proto)) { |
1da177e4 LT |
621 | xfrm_state_hold(x); |
622 | spin_unlock_bh(&xfrm_state_lock); | |
623 | ||
161a09e7 | 624 | err = xfrm_state_delete(x); |
ab5f5e8b JL |
625 | xfrm_audit_state_delete(x, err ? 0 : 1, |
626 | audit_info->loginuid, | |
2532386f | 627 | audit_info->sessionid, |
ab5f5e8b | 628 | audit_info->secid); |
1da177e4 LT |
629 | xfrm_state_put(x); |
630 | ||
631 | spin_lock_bh(&xfrm_state_lock); | |
632 | goto restart; | |
633 | } | |
634 | } | |
635 | } | |
4aa2e62c JL |
636 | err = 0; |
637 | ||
638 | out: | |
1da177e4 | 639 | spin_unlock_bh(&xfrm_state_lock); |
50a30657 | 640 | wake_up(&init_net.xfrm.km_waitq); |
4aa2e62c | 641 | return err; |
1da177e4 LT |
642 | } |
643 | EXPORT_SYMBOL(xfrm_state_flush); | |
644 | ||
af11e316 | 645 | void xfrm_sad_getinfo(struct xfrmk_sadinfo *si) |
28d8909b JHS |
646 | { |
647 | spin_lock_bh(&xfrm_state_lock); | |
0bf7c5b0 | 648 | si->sadcnt = init_net.xfrm.state_num; |
529983ec | 649 | si->sadhcnt = init_net.xfrm.state_hmask; |
28d8909b JHS |
650 | si->sadhmcnt = xfrm_state_hashmax; |
651 | spin_unlock_bh(&xfrm_state_lock); | |
652 | } | |
653 | EXPORT_SYMBOL(xfrm_sad_getinfo); | |
654 | ||
1da177e4 LT |
655 | static int |
656 | xfrm_init_tempsel(struct xfrm_state *x, struct flowi *fl, | |
657 | struct xfrm_tmpl *tmpl, | |
658 | xfrm_address_t *daddr, xfrm_address_t *saddr, | |
659 | unsigned short family) | |
660 | { | |
661 | struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); | |
662 | if (!afinfo) | |
663 | return -1; | |
664 | afinfo->init_tempsel(x, fl, tmpl, daddr, saddr); | |
665 | xfrm_state_put_afinfo(afinfo); | |
666 | return 0; | |
667 | } | |
668 | ||
a94cfd19 | 669 | static struct xfrm_state *__xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family) |
edcd5821 | 670 | { |
64d0cd00 | 671 | unsigned int h = xfrm_spi_hash(&init_net, daddr, spi, proto, family); |
edcd5821 | 672 | struct xfrm_state *x; |
8f126e37 | 673 | struct hlist_node *entry; |
edcd5821 | 674 | |
b754a4fd | 675 | hlist_for_each_entry(x, entry, init_net.xfrm.state_byspi+h, byspi) { |
edcd5821 DM |
676 | if (x->props.family != family || |
677 | x->id.spi != spi || | |
678 | x->id.proto != proto) | |
679 | continue; | |
680 | ||
681 | switch (family) { | |
682 | case AF_INET: | |
683 | if (x->id.daddr.a4 != daddr->a4) | |
684 | continue; | |
685 | break; | |
686 | case AF_INET6: | |
687 | if (!ipv6_addr_equal((struct in6_addr *)daddr, | |
688 | (struct in6_addr *) | |
689 | x->id.daddr.a6)) | |
690 | continue; | |
691 | break; | |
3ff50b79 | 692 | } |
edcd5821 DM |
693 | |
694 | xfrm_state_hold(x); | |
695 | return x; | |
696 | } | |
697 | ||
698 | return NULL; | |
699 | } | |
700 | ||
701 | static struct xfrm_state *__xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family) | |
702 | { | |
64d0cd00 | 703 | unsigned int h = xfrm_src_hash(&init_net, daddr, saddr, family); |
edcd5821 | 704 | struct xfrm_state *x; |
8f126e37 | 705 | struct hlist_node *entry; |
edcd5821 | 706 | |
d320bbb3 | 707 | hlist_for_each_entry(x, entry, init_net.xfrm.state_bysrc+h, bysrc) { |
edcd5821 DM |
708 | if (x->props.family != family || |
709 | x->id.proto != proto) | |
710 | continue; | |
711 | ||
712 | switch (family) { | |
713 | case AF_INET: | |
714 | if (x->id.daddr.a4 != daddr->a4 || | |
715 | x->props.saddr.a4 != saddr->a4) | |
716 | continue; | |
717 | break; | |
718 | case AF_INET6: | |
719 | if (!ipv6_addr_equal((struct in6_addr *)daddr, | |
720 | (struct in6_addr *) | |
721 | x->id.daddr.a6) || | |
722 | !ipv6_addr_equal((struct in6_addr *)saddr, | |
723 | (struct in6_addr *) | |
724 | x->props.saddr.a6)) | |
725 | continue; | |
726 | break; | |
3ff50b79 | 727 | } |
edcd5821 DM |
728 | |
729 | xfrm_state_hold(x); | |
730 | return x; | |
731 | } | |
732 | ||
733 | return NULL; | |
734 | } | |
735 | ||
736 | static inline struct xfrm_state * | |
737 | __xfrm_state_locate(struct xfrm_state *x, int use_spi, int family) | |
738 | { | |
739 | if (use_spi) | |
740 | return __xfrm_state_lookup(&x->id.daddr, x->id.spi, | |
741 | x->id.proto, family); | |
742 | else | |
743 | return __xfrm_state_lookup_byaddr(&x->id.daddr, | |
744 | &x->props.saddr, | |
745 | x->id.proto, family); | |
746 | } | |
747 | ||
2fab22f2 PM |
748 | static void xfrm_hash_grow_check(int have_hash_collision) |
749 | { | |
750 | if (have_hash_collision && | |
529983ec | 751 | (init_net.xfrm.state_hmask + 1) < xfrm_state_hashmax && |
0bf7c5b0 | 752 | init_net.xfrm.state_num > init_net.xfrm.state_hmask) |
63082733 | 753 | schedule_work(&init_net.xfrm.state_hash_work); |
2fab22f2 PM |
754 | } |
755 | ||
1da177e4 | 756 | struct xfrm_state * |
a716c119 | 757 | xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr, |
1da177e4 LT |
758 | struct flowi *fl, struct xfrm_tmpl *tmpl, |
759 | struct xfrm_policy *pol, int *err, | |
760 | unsigned short family) | |
761 | { | |
4bda4f25 | 762 | unsigned int h; |
8f126e37 | 763 | struct hlist_node *entry; |
37b08e34 | 764 | struct xfrm_state *x, *x0, *to_put; |
1da177e4 LT |
765 | int acquire_in_progress = 0; |
766 | int error = 0; | |
767 | struct xfrm_state *best = NULL; | |
a716c119 | 768 | |
37b08e34 DM |
769 | to_put = NULL; |
770 | ||
1da177e4 | 771 | spin_lock_bh(&xfrm_state_lock); |
64d0cd00 | 772 | h = xfrm_dst_hash(&init_net, daddr, saddr, tmpl->reqid, family); |
73d189dc | 773 | hlist_for_each_entry(x, entry, init_net.xfrm.state_bydst+h, bydst) { |
1da177e4 LT |
774 | if (x->props.family == family && |
775 | x->props.reqid == tmpl->reqid && | |
fbd9a5b4 | 776 | !(x->props.flags & XFRM_STATE_WILDRECV) && |
1da177e4 LT |
777 | xfrm_state_addr_check(x, daddr, saddr, family) && |
778 | tmpl->mode == x->props.mode && | |
779 | tmpl->id.proto == x->id.proto && | |
780 | (tmpl->id.spi == x->id.spi || !tmpl->id.spi)) { | |
781 | /* Resolution logic: | |
782 | 1. There is a valid state with matching selector. | |
783 | Done. | |
784 | 2. Valid state with inappropriate selector. Skip. | |
785 | ||
786 | Entering area of "sysdeps". | |
787 | ||
788 | 3. If state is not valid, selector is temporary, | |
789 | it selects only session which triggered | |
790 | previous resolution. Key manager will do | |
791 | something to install a state with proper | |
792 | selector. | |
793 | */ | |
794 | if (x->km.state == XFRM_STATE_VALID) { | |
df9dcb45 | 795 | if ((x->sel.family && !xfrm_selector_match(&x->sel, fl, x->sel.family)) || |
e0d1caa7 | 796 | !security_xfrm_state_pol_flow_match(x, pol, fl)) |
1da177e4 LT |
797 | continue; |
798 | if (!best || | |
799 | best->km.dying > x->km.dying || | |
800 | (best->km.dying == x->km.dying && | |
801 | best->curlft.add_time < x->curlft.add_time)) | |
802 | best = x; | |
803 | } else if (x->km.state == XFRM_STATE_ACQ) { | |
804 | acquire_in_progress = 1; | |
805 | } else if (x->km.state == XFRM_STATE_ERROR || | |
806 | x->km.state == XFRM_STATE_EXPIRED) { | |
48b8d783 | 807 | if (xfrm_selector_match(&x->sel, fl, x->sel.family) && |
e0d1caa7 | 808 | security_xfrm_state_pol_flow_match(x, pol, fl)) |
1da177e4 LT |
809 | error = -ESRCH; |
810 | } | |
811 | } | |
812 | } | |
813 | ||
814 | x = best; | |
815 | if (!x && !error && !acquire_in_progress) { | |
5c5d281a | 816 | if (tmpl->id.spi && |
edcd5821 DM |
817 | (x0 = __xfrm_state_lookup(daddr, tmpl->id.spi, |
818 | tmpl->id.proto, family)) != NULL) { | |
37b08e34 | 819 | to_put = x0; |
1da177e4 LT |
820 | error = -EEXIST; |
821 | goto out; | |
822 | } | |
673c09be | 823 | x = xfrm_state_alloc(&init_net); |
1da177e4 LT |
824 | if (x == NULL) { |
825 | error = -ENOMEM; | |
826 | goto out; | |
827 | } | |
828 | /* Initialize temporary selector matching only | |
829 | * to current session. */ | |
830 | xfrm_init_tempsel(x, fl, tmpl, daddr, saddr, family); | |
831 | ||
e0d1caa7 VY |
832 | error = security_xfrm_state_alloc_acquire(x, pol->security, fl->secid); |
833 | if (error) { | |
834 | x->km.state = XFRM_STATE_DEAD; | |
37b08e34 | 835 | to_put = x; |
e0d1caa7 VY |
836 | x = NULL; |
837 | goto out; | |
838 | } | |
839 | ||
1da177e4 LT |
840 | if (km_query(x, tmpl, pol) == 0) { |
841 | x->km.state = XFRM_STATE_ACQ; | |
9d4139c7 | 842 | list_add(&x->km.all, &init_net.xfrm.state_all); |
73d189dc | 843 | hlist_add_head(&x->bydst, init_net.xfrm.state_bydst+h); |
64d0cd00 | 844 | h = xfrm_src_hash(&init_net, daddr, saddr, family); |
d320bbb3 | 845 | hlist_add_head(&x->bysrc, init_net.xfrm.state_bysrc+h); |
1da177e4 | 846 | if (x->id.spi) { |
64d0cd00 | 847 | h = xfrm_spi_hash(&init_net, &x->id.daddr, x->id.spi, x->id.proto, family); |
b754a4fd | 848 | hlist_add_head(&x->byspi, init_net.xfrm.state_byspi+h); |
1da177e4 | 849 | } |
01e67d08 DM |
850 | x->lft.hard_add_expires_seconds = sysctl_xfrm_acq_expires; |
851 | x->timer.expires = jiffies + sysctl_xfrm_acq_expires*HZ; | |
1da177e4 | 852 | add_timer(&x->timer); |
0bf7c5b0 | 853 | init_net.xfrm.state_num++; |
2fab22f2 | 854 | xfrm_hash_grow_check(x->bydst.next != NULL); |
1da177e4 LT |
855 | } else { |
856 | x->km.state = XFRM_STATE_DEAD; | |
37b08e34 | 857 | to_put = x; |
1da177e4 LT |
858 | x = NULL; |
859 | error = -ESRCH; | |
860 | } | |
861 | } | |
862 | out: | |
863 | if (x) | |
864 | xfrm_state_hold(x); | |
865 | else | |
866 | *err = acquire_in_progress ? -EAGAIN : error; | |
867 | spin_unlock_bh(&xfrm_state_lock); | |
37b08e34 DM |
868 | if (to_put) |
869 | xfrm_state_put(to_put); | |
1da177e4 LT |
870 | return x; |
871 | } | |
872 | ||
628529b6 JHS |
873 | struct xfrm_state * |
874 | xfrm_stateonly_find(xfrm_address_t *daddr, xfrm_address_t *saddr, | |
875 | unsigned short family, u8 mode, u8 proto, u32 reqid) | |
876 | { | |
4bda4f25 | 877 | unsigned int h; |
628529b6 JHS |
878 | struct xfrm_state *rx = NULL, *x = NULL; |
879 | struct hlist_node *entry; | |
880 | ||
881 | spin_lock(&xfrm_state_lock); | |
64d0cd00 | 882 | h = xfrm_dst_hash(&init_net, daddr, saddr, reqid, family); |
73d189dc | 883 | hlist_for_each_entry(x, entry, init_net.xfrm.state_bydst+h, bydst) { |
628529b6 JHS |
884 | if (x->props.family == family && |
885 | x->props.reqid == reqid && | |
886 | !(x->props.flags & XFRM_STATE_WILDRECV) && | |
887 | xfrm_state_addr_check(x, daddr, saddr, family) && | |
888 | mode == x->props.mode && | |
889 | proto == x->id.proto && | |
890 | x->km.state == XFRM_STATE_VALID) { | |
891 | rx = x; | |
892 | break; | |
893 | } | |
894 | } | |
895 | ||
896 | if (rx) | |
897 | xfrm_state_hold(rx); | |
898 | spin_unlock(&xfrm_state_lock); | |
899 | ||
900 | ||
901 | return rx; | |
902 | } | |
903 | EXPORT_SYMBOL(xfrm_stateonly_find); | |
904 | ||
1da177e4 LT |
905 | static void __xfrm_state_insert(struct xfrm_state *x) |
906 | { | |
a624c108 | 907 | unsigned int h; |
1da177e4 | 908 | |
9d4a706d DM |
909 | x->genid = ++xfrm_state_genid; |
910 | ||
9d4139c7 | 911 | list_add(&x->km.all, &init_net.xfrm.state_all); |
4c563f76 | 912 | |
64d0cd00 | 913 | h = xfrm_dst_hash(&init_net, &x->id.daddr, &x->props.saddr, |
c1969f29 | 914 | x->props.reqid, x->props.family); |
73d189dc | 915 | hlist_add_head(&x->bydst, init_net.xfrm.state_bydst+h); |
1da177e4 | 916 | |
64d0cd00 | 917 | h = xfrm_src_hash(&init_net, &x->id.daddr, &x->props.saddr, x->props.family); |
d320bbb3 | 918 | hlist_add_head(&x->bysrc, init_net.xfrm.state_bysrc+h); |
1da177e4 | 919 | |
7b4dc360 | 920 | if (x->id.spi) { |
64d0cd00 | 921 | h = xfrm_spi_hash(&init_net, &x->id.daddr, x->id.spi, x->id.proto, |
6c44e6b7 MN |
922 | x->props.family); |
923 | ||
b754a4fd | 924 | hlist_add_head(&x->byspi, init_net.xfrm.state_byspi+h); |
6c44e6b7 MN |
925 | } |
926 | ||
a47f0ce0 DM |
927 | mod_timer(&x->timer, jiffies + HZ); |
928 | if (x->replay_maxage) | |
929 | mod_timer(&x->rtimer, jiffies + x->replay_maxage); | |
f8cd5488 | 930 | |
50a30657 | 931 | wake_up(&init_net.xfrm.km_waitq); |
f034b5d4 | 932 | |
0bf7c5b0 | 933 | init_net.xfrm.state_num++; |
f034b5d4 | 934 | |
918049f0 | 935 | xfrm_hash_grow_check(x->bydst.next != NULL); |
1da177e4 LT |
936 | } |
937 | ||
c7f5ea3a DM |
938 | /* xfrm_state_lock is held */ |
939 | static void __xfrm_state_bump_genids(struct xfrm_state *xnew) | |
940 | { | |
941 | unsigned short family = xnew->props.family; | |
942 | u32 reqid = xnew->props.reqid; | |
943 | struct xfrm_state *x; | |
944 | struct hlist_node *entry; | |
945 | unsigned int h; | |
946 | ||
64d0cd00 | 947 | h = xfrm_dst_hash(&init_net, &xnew->id.daddr, &xnew->props.saddr, reqid, family); |
73d189dc | 948 | hlist_for_each_entry(x, entry, init_net.xfrm.state_bydst+h, bydst) { |
c7f5ea3a DM |
949 | if (x->props.family == family && |
950 | x->props.reqid == reqid && | |
c1969f29 DM |
951 | !xfrm_addr_cmp(&x->id.daddr, &xnew->id.daddr, family) && |
952 | !xfrm_addr_cmp(&x->props.saddr, &xnew->props.saddr, family)) | |
c7f5ea3a DM |
953 | x->genid = xfrm_state_genid; |
954 | } | |
955 | } | |
956 | ||
1da177e4 LT |
957 | void xfrm_state_insert(struct xfrm_state *x) |
958 | { | |
959 | spin_lock_bh(&xfrm_state_lock); | |
c7f5ea3a | 960 | __xfrm_state_bump_genids(x); |
1da177e4 LT |
961 | __xfrm_state_insert(x); |
962 | spin_unlock_bh(&xfrm_state_lock); | |
963 | } | |
964 | EXPORT_SYMBOL(xfrm_state_insert); | |
965 | ||
2770834c DM |
966 | /* xfrm_state_lock is held */ |
967 | static struct xfrm_state *__find_acq_core(unsigned short family, u8 mode, u32 reqid, u8 proto, xfrm_address_t *daddr, xfrm_address_t *saddr, int create) | |
968 | { | |
64d0cd00 | 969 | unsigned int h = xfrm_dst_hash(&init_net, daddr, saddr, reqid, family); |
8f126e37 | 970 | struct hlist_node *entry; |
2770834c DM |
971 | struct xfrm_state *x; |
972 | ||
73d189dc | 973 | hlist_for_each_entry(x, entry, init_net.xfrm.state_bydst+h, bydst) { |
2770834c DM |
974 | if (x->props.reqid != reqid || |
975 | x->props.mode != mode || | |
976 | x->props.family != family || | |
977 | x->km.state != XFRM_STATE_ACQ || | |
75e252d9 JL |
978 | x->id.spi != 0 || |
979 | x->id.proto != proto) | |
2770834c DM |
980 | continue; |
981 | ||
982 | switch (family) { | |
983 | case AF_INET: | |
984 | if (x->id.daddr.a4 != daddr->a4 || | |
985 | x->props.saddr.a4 != saddr->a4) | |
986 | continue; | |
987 | break; | |
988 | case AF_INET6: | |
989 | if (!ipv6_addr_equal((struct in6_addr *)x->id.daddr.a6, | |
990 | (struct in6_addr *)daddr) || | |
991 | !ipv6_addr_equal((struct in6_addr *) | |
992 | x->props.saddr.a6, | |
993 | (struct in6_addr *)saddr)) | |
994 | continue; | |
995 | break; | |
3ff50b79 | 996 | } |
2770834c DM |
997 | |
998 | xfrm_state_hold(x); | |
999 | return x; | |
1000 | } | |
1001 | ||
1002 | if (!create) | |
1003 | return NULL; | |
1004 | ||
673c09be | 1005 | x = xfrm_state_alloc(&init_net); |
2770834c DM |
1006 | if (likely(x)) { |
1007 | switch (family) { | |
1008 | case AF_INET: | |
1009 | x->sel.daddr.a4 = daddr->a4; | |
1010 | x->sel.saddr.a4 = saddr->a4; | |
1011 | x->sel.prefixlen_d = 32; | |
1012 | x->sel.prefixlen_s = 32; | |
1013 | x->props.saddr.a4 = saddr->a4; | |
1014 | x->id.daddr.a4 = daddr->a4; | |
1015 | break; | |
1016 | ||
1017 | case AF_INET6: | |
1018 | ipv6_addr_copy((struct in6_addr *)x->sel.daddr.a6, | |
1019 | (struct in6_addr *)daddr); | |
1020 | ipv6_addr_copy((struct in6_addr *)x->sel.saddr.a6, | |
1021 | (struct in6_addr *)saddr); | |
1022 | x->sel.prefixlen_d = 128; | |
1023 | x->sel.prefixlen_s = 128; | |
1024 | ipv6_addr_copy((struct in6_addr *)x->props.saddr.a6, | |
1025 | (struct in6_addr *)saddr); | |
1026 | ipv6_addr_copy((struct in6_addr *)x->id.daddr.a6, | |
1027 | (struct in6_addr *)daddr); | |
1028 | break; | |
3ff50b79 | 1029 | } |
2770834c DM |
1030 | |
1031 | x->km.state = XFRM_STATE_ACQ; | |
1032 | x->id.proto = proto; | |
1033 | x->props.family = family; | |
1034 | x->props.mode = mode; | |
1035 | x->props.reqid = reqid; | |
01e67d08 | 1036 | x->lft.hard_add_expires_seconds = sysctl_xfrm_acq_expires; |
2770834c | 1037 | xfrm_state_hold(x); |
01e67d08 | 1038 | x->timer.expires = jiffies + sysctl_xfrm_acq_expires*HZ; |
2770834c | 1039 | add_timer(&x->timer); |
9d4139c7 | 1040 | list_add(&x->km.all, &init_net.xfrm.state_all); |
73d189dc | 1041 | hlist_add_head(&x->bydst, init_net.xfrm.state_bydst+h); |
64d0cd00 | 1042 | h = xfrm_src_hash(&init_net, daddr, saddr, family); |
d320bbb3 | 1043 | hlist_add_head(&x->bysrc, init_net.xfrm.state_bysrc+h); |
918049f0 | 1044 | |
0bf7c5b0 | 1045 | init_net.xfrm.state_num++; |
918049f0 DM |
1046 | |
1047 | xfrm_hash_grow_check(x->bydst.next != NULL); | |
2770834c DM |
1048 | } |
1049 | ||
1050 | return x; | |
1051 | } | |
1052 | ||
1da177e4 LT |
1053 | static struct xfrm_state *__xfrm_find_acq_byseq(u32 seq); |
1054 | ||
1055 | int xfrm_state_add(struct xfrm_state *x) | |
1056 | { | |
37b08e34 | 1057 | struct xfrm_state *x1, *to_put; |
1da177e4 LT |
1058 | int family; |
1059 | int err; | |
eb2971b6 | 1060 | int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY); |
1da177e4 LT |
1061 | |
1062 | family = x->props.family; | |
1da177e4 | 1063 | |
37b08e34 DM |
1064 | to_put = NULL; |
1065 | ||
1da177e4 LT |
1066 | spin_lock_bh(&xfrm_state_lock); |
1067 | ||
edcd5821 | 1068 | x1 = __xfrm_state_locate(x, use_spi, family); |
1da177e4 | 1069 | if (x1) { |
37b08e34 | 1070 | to_put = x1; |
1da177e4 LT |
1071 | x1 = NULL; |
1072 | err = -EEXIST; | |
1073 | goto out; | |
1074 | } | |
1075 | ||
eb2971b6 | 1076 | if (use_spi && x->km.seq) { |
1da177e4 | 1077 | x1 = __xfrm_find_acq_byseq(x->km.seq); |
75e252d9 JL |
1078 | if (x1 && ((x1->id.proto != x->id.proto) || |
1079 | xfrm_addr_cmp(&x1->id.daddr, &x->id.daddr, family))) { | |
37b08e34 | 1080 | to_put = x1; |
1da177e4 LT |
1081 | x1 = NULL; |
1082 | } | |
1083 | } | |
1084 | ||
eb2971b6 | 1085 | if (use_spi && !x1) |
2770834c DM |
1086 | x1 = __find_acq_core(family, x->props.mode, x->props.reqid, |
1087 | x->id.proto, | |
1088 | &x->id.daddr, &x->props.saddr, 0); | |
1da177e4 | 1089 | |
c7f5ea3a | 1090 | __xfrm_state_bump_genids(x); |
1da177e4 LT |
1091 | __xfrm_state_insert(x); |
1092 | err = 0; | |
1093 | ||
1094 | out: | |
1095 | spin_unlock_bh(&xfrm_state_lock); | |
1da177e4 LT |
1096 | |
1097 | if (x1) { | |
1098 | xfrm_state_delete(x1); | |
1099 | xfrm_state_put(x1); | |
1100 | } | |
1101 | ||
37b08e34 DM |
1102 | if (to_put) |
1103 | xfrm_state_put(to_put); | |
1104 | ||
1da177e4 LT |
1105 | return err; |
1106 | } | |
1107 | EXPORT_SYMBOL(xfrm_state_add); | |
1108 | ||
80c9abaa | 1109 | #ifdef CONFIG_XFRM_MIGRATE |
6666351d | 1110 | static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig, int *errp) |
80c9abaa SS |
1111 | { |
1112 | int err = -ENOMEM; | |
673c09be | 1113 | struct xfrm_state *x = xfrm_state_alloc(&init_net); |
80c9abaa SS |
1114 | if (!x) |
1115 | goto error; | |
1116 | ||
1117 | memcpy(&x->id, &orig->id, sizeof(x->id)); | |
1118 | memcpy(&x->sel, &orig->sel, sizeof(x->sel)); | |
1119 | memcpy(&x->lft, &orig->lft, sizeof(x->lft)); | |
1120 | x->props.mode = orig->props.mode; | |
1121 | x->props.replay_window = orig->props.replay_window; | |
1122 | x->props.reqid = orig->props.reqid; | |
1123 | x->props.family = orig->props.family; | |
1124 | x->props.saddr = orig->props.saddr; | |
1125 | ||
1126 | if (orig->aalg) { | |
1127 | x->aalg = xfrm_algo_clone(orig->aalg); | |
1128 | if (!x->aalg) | |
1129 | goto error; | |
1130 | } | |
1131 | x->props.aalgo = orig->props.aalgo; | |
1132 | ||
1133 | if (orig->ealg) { | |
1134 | x->ealg = xfrm_algo_clone(orig->ealg); | |
1135 | if (!x->ealg) | |
1136 | goto error; | |
1137 | } | |
1138 | x->props.ealgo = orig->props.ealgo; | |
1139 | ||
1140 | if (orig->calg) { | |
1141 | x->calg = xfrm_algo_clone(orig->calg); | |
1142 | if (!x->calg) | |
1143 | goto error; | |
1144 | } | |
1145 | x->props.calgo = orig->props.calgo; | |
1146 | ||
a716c119 | 1147 | if (orig->encap) { |
80c9abaa SS |
1148 | x->encap = kmemdup(orig->encap, sizeof(*x->encap), GFP_KERNEL); |
1149 | if (!x->encap) | |
1150 | goto error; | |
1151 | } | |
1152 | ||
1153 | if (orig->coaddr) { | |
1154 | x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr), | |
1155 | GFP_KERNEL); | |
1156 | if (!x->coaddr) | |
1157 | goto error; | |
1158 | } | |
1159 | ||
1160 | err = xfrm_init_state(x); | |
1161 | if (err) | |
1162 | goto error; | |
1163 | ||
1164 | x->props.flags = orig->props.flags; | |
1165 | ||
1166 | x->curlft.add_time = orig->curlft.add_time; | |
1167 | x->km.state = orig->km.state; | |
1168 | x->km.seq = orig->km.seq; | |
1169 | ||
1170 | return x; | |
1171 | ||
1172 | error: | |
1173 | if (errp) | |
1174 | *errp = err; | |
1175 | if (x) { | |
1176 | kfree(x->aalg); | |
1177 | kfree(x->ealg); | |
1178 | kfree(x->calg); | |
1179 | kfree(x->encap); | |
1180 | kfree(x->coaddr); | |
1181 | } | |
1182 | kfree(x); | |
1183 | return NULL; | |
1184 | } | |
80c9abaa SS |
1185 | |
1186 | /* xfrm_state_lock is held */ | |
1187 | struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m) | |
1188 | { | |
1189 | unsigned int h; | |
1190 | struct xfrm_state *x; | |
1191 | struct hlist_node *entry; | |
1192 | ||
1193 | if (m->reqid) { | |
64d0cd00 | 1194 | h = xfrm_dst_hash(&init_net, &m->old_daddr, &m->old_saddr, |
80c9abaa | 1195 | m->reqid, m->old_family); |
73d189dc | 1196 | hlist_for_each_entry(x, entry, init_net.xfrm.state_bydst+h, bydst) { |
80c9abaa SS |
1197 | if (x->props.mode != m->mode || |
1198 | x->id.proto != m->proto) | |
1199 | continue; | |
1200 | if (m->reqid && x->props.reqid != m->reqid) | |
1201 | continue; | |
1202 | if (xfrm_addr_cmp(&x->id.daddr, &m->old_daddr, | |
1203 | m->old_family) || | |
1204 | xfrm_addr_cmp(&x->props.saddr, &m->old_saddr, | |
1205 | m->old_family)) | |
1206 | continue; | |
1207 | xfrm_state_hold(x); | |
1208 | return x; | |
1209 | } | |
1210 | } else { | |
64d0cd00 | 1211 | h = xfrm_src_hash(&init_net, &m->old_daddr, &m->old_saddr, |
80c9abaa | 1212 | m->old_family); |
d320bbb3 | 1213 | hlist_for_each_entry(x, entry, init_net.xfrm.state_bysrc+h, bysrc) { |
80c9abaa SS |
1214 | if (x->props.mode != m->mode || |
1215 | x->id.proto != m->proto) | |
1216 | continue; | |
1217 | if (xfrm_addr_cmp(&x->id.daddr, &m->old_daddr, | |
1218 | m->old_family) || | |
1219 | xfrm_addr_cmp(&x->props.saddr, &m->old_saddr, | |
1220 | m->old_family)) | |
1221 | continue; | |
1222 | xfrm_state_hold(x); | |
1223 | return x; | |
1224 | } | |
1225 | } | |
1226 | ||
a716c119 | 1227 | return NULL; |
80c9abaa SS |
1228 | } |
1229 | EXPORT_SYMBOL(xfrm_migrate_state_find); | |
1230 | ||
1231 | struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x, | |
1232 | struct xfrm_migrate *m) | |
1233 | { | |
1234 | struct xfrm_state *xc; | |
1235 | int err; | |
1236 | ||
1237 | xc = xfrm_state_clone(x, &err); | |
1238 | if (!xc) | |
1239 | return NULL; | |
1240 | ||
1241 | memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr)); | |
1242 | memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr)); | |
1243 | ||
1244 | /* add state */ | |
1245 | if (!xfrm_addr_cmp(&x->id.daddr, &m->new_daddr, m->new_family)) { | |
1246 | /* a care is needed when the destination address of the | |
1247 | state is to be updated as it is a part of triplet */ | |
1248 | xfrm_state_insert(xc); | |
1249 | } else { | |
1250 | if ((err = xfrm_state_add(xc)) < 0) | |
1251 | goto error; | |
1252 | } | |
1253 | ||
1254 | return xc; | |
1255 | error: | |
1256 | kfree(xc); | |
1257 | return NULL; | |
1258 | } | |
1259 | EXPORT_SYMBOL(xfrm_state_migrate); | |
1260 | #endif | |
1261 | ||
1da177e4 LT |
1262 | int xfrm_state_update(struct xfrm_state *x) |
1263 | { | |
37b08e34 | 1264 | struct xfrm_state *x1, *to_put; |
1da177e4 | 1265 | int err; |
eb2971b6 | 1266 | int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY); |
1da177e4 | 1267 | |
37b08e34 DM |
1268 | to_put = NULL; |
1269 | ||
1da177e4 | 1270 | spin_lock_bh(&xfrm_state_lock); |
edcd5821 | 1271 | x1 = __xfrm_state_locate(x, use_spi, x->props.family); |
1da177e4 LT |
1272 | |
1273 | err = -ESRCH; | |
1274 | if (!x1) | |
1275 | goto out; | |
1276 | ||
1277 | if (xfrm_state_kern(x1)) { | |
37b08e34 | 1278 | to_put = x1; |
1da177e4 LT |
1279 | err = -EEXIST; |
1280 | goto out; | |
1281 | } | |
1282 | ||
1283 | if (x1->km.state == XFRM_STATE_ACQ) { | |
1284 | __xfrm_state_insert(x); | |
1285 | x = NULL; | |
1286 | } | |
1287 | err = 0; | |
1288 | ||
1289 | out: | |
1290 | spin_unlock_bh(&xfrm_state_lock); | |
1da177e4 | 1291 | |
37b08e34 DM |
1292 | if (to_put) |
1293 | xfrm_state_put(to_put); | |
1294 | ||
1da177e4 LT |
1295 | if (err) |
1296 | return err; | |
1297 | ||
1298 | if (!x) { | |
1299 | xfrm_state_delete(x1); | |
1300 | xfrm_state_put(x1); | |
1301 | return 0; | |
1302 | } | |
1303 | ||
1304 | err = -EINVAL; | |
1305 | spin_lock_bh(&x1->lock); | |
1306 | if (likely(x1->km.state == XFRM_STATE_VALID)) { | |
1307 | if (x->encap && x1->encap) | |
1308 | memcpy(x1->encap, x->encap, sizeof(*x1->encap)); | |
060f02a3 NT |
1309 | if (x->coaddr && x1->coaddr) { |
1310 | memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr)); | |
1311 | } | |
1312 | if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel))) | |
1313 | memcpy(&x1->sel, &x->sel, sizeof(x1->sel)); | |
1da177e4 LT |
1314 | memcpy(&x1->lft, &x->lft, sizeof(x1->lft)); |
1315 | x1->km.dying = 0; | |
1316 | ||
a47f0ce0 | 1317 | mod_timer(&x1->timer, jiffies + HZ); |
1da177e4 LT |
1318 | if (x1->curlft.use_time) |
1319 | xfrm_state_check_expire(x1); | |
1320 | ||
1321 | err = 0; | |
1322 | } | |
1323 | spin_unlock_bh(&x1->lock); | |
1324 | ||
1325 | xfrm_state_put(x1); | |
1326 | ||
1327 | return err; | |
1328 | } | |
1329 | EXPORT_SYMBOL(xfrm_state_update); | |
1330 | ||
1331 | int xfrm_state_check_expire(struct xfrm_state *x) | |
1332 | { | |
1333 | if (!x->curlft.use_time) | |
9d729f72 | 1334 | x->curlft.use_time = get_seconds(); |
1da177e4 LT |
1335 | |
1336 | if (x->km.state != XFRM_STATE_VALID) | |
1337 | return -EINVAL; | |
1338 | ||
1339 | if (x->curlft.bytes >= x->lft.hard_byte_limit || | |
1340 | x->curlft.packets >= x->lft.hard_packet_limit) { | |
4666faab | 1341 | x->km.state = XFRM_STATE_EXPIRED; |
a47f0ce0 | 1342 | mod_timer(&x->timer, jiffies); |
1da177e4 LT |
1343 | return -EINVAL; |
1344 | } | |
1345 | ||
1346 | if (!x->km.dying && | |
1347 | (x->curlft.bytes >= x->lft.soft_byte_limit || | |
4666faab HX |
1348 | x->curlft.packets >= x->lft.soft_packet_limit)) { |
1349 | x->km.dying = 1; | |
53bc6b4d | 1350 | km_state_expired(x, 0, 0); |
4666faab | 1351 | } |
1da177e4 LT |
1352 | return 0; |
1353 | } | |
1354 | EXPORT_SYMBOL(xfrm_state_check_expire); | |
1355 | ||
1da177e4 | 1356 | struct xfrm_state * |
a94cfd19 | 1357 | xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, |
1da177e4 LT |
1358 | unsigned short family) |
1359 | { | |
1360 | struct xfrm_state *x; | |
1da177e4 LT |
1361 | |
1362 | spin_lock_bh(&xfrm_state_lock); | |
edcd5821 | 1363 | x = __xfrm_state_lookup(daddr, spi, proto, family); |
1da177e4 | 1364 | spin_unlock_bh(&xfrm_state_lock); |
1da177e4 LT |
1365 | return x; |
1366 | } | |
1367 | EXPORT_SYMBOL(xfrm_state_lookup); | |
1368 | ||
1369 | struct xfrm_state * | |
eb2971b6 MN |
1370 | xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, |
1371 | u8 proto, unsigned short family) | |
1372 | { | |
1373 | struct xfrm_state *x; | |
eb2971b6 MN |
1374 | |
1375 | spin_lock_bh(&xfrm_state_lock); | |
edcd5821 | 1376 | x = __xfrm_state_lookup_byaddr(daddr, saddr, proto, family); |
eb2971b6 | 1377 | spin_unlock_bh(&xfrm_state_lock); |
eb2971b6 MN |
1378 | return x; |
1379 | } | |
1380 | EXPORT_SYMBOL(xfrm_state_lookup_byaddr); | |
1381 | ||
1382 | struct xfrm_state * | |
a716c119 YH |
1383 | xfrm_find_acq(u8 mode, u32 reqid, u8 proto, |
1384 | xfrm_address_t *daddr, xfrm_address_t *saddr, | |
1da177e4 LT |
1385 | int create, unsigned short family) |
1386 | { | |
1387 | struct xfrm_state *x; | |
1da177e4 LT |
1388 | |
1389 | spin_lock_bh(&xfrm_state_lock); | |
2770834c | 1390 | x = __find_acq_core(family, mode, reqid, proto, daddr, saddr, create); |
1da177e4 | 1391 | spin_unlock_bh(&xfrm_state_lock); |
2770834c | 1392 | |
1da177e4 LT |
1393 | return x; |
1394 | } | |
1395 | EXPORT_SYMBOL(xfrm_find_acq); | |
1396 | ||
41a49cc3 MN |
1397 | #ifdef CONFIG_XFRM_SUB_POLICY |
1398 | int | |
1399 | xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n, | |
1400 | unsigned short family) | |
1401 | { | |
1402 | int err = 0; | |
1403 | struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); | |
1404 | if (!afinfo) | |
1405 | return -EAFNOSUPPORT; | |
1406 | ||
1407 | spin_lock_bh(&xfrm_state_lock); | |
1408 | if (afinfo->tmpl_sort) | |
1409 | err = afinfo->tmpl_sort(dst, src, n); | |
1410 | spin_unlock_bh(&xfrm_state_lock); | |
1411 | xfrm_state_put_afinfo(afinfo); | |
1412 | return err; | |
1413 | } | |
1414 | EXPORT_SYMBOL(xfrm_tmpl_sort); | |
1415 | ||
1416 | int | |
1417 | xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n, | |
1418 | unsigned short family) | |
1419 | { | |
1420 | int err = 0; | |
1421 | struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); | |
1422 | if (!afinfo) | |
1423 | return -EAFNOSUPPORT; | |
1424 | ||
1425 | spin_lock_bh(&xfrm_state_lock); | |
1426 | if (afinfo->state_sort) | |
1427 | err = afinfo->state_sort(dst, src, n); | |
1428 | spin_unlock_bh(&xfrm_state_lock); | |
1429 | xfrm_state_put_afinfo(afinfo); | |
1430 | return err; | |
1431 | } | |
1432 | EXPORT_SYMBOL(xfrm_state_sort); | |
1433 | #endif | |
1434 | ||
1da177e4 LT |
1435 | /* Silly enough, but I'm lazy to build resolution list */ |
1436 | ||
1437 | static struct xfrm_state *__xfrm_find_acq_byseq(u32 seq) | |
1438 | { | |
1439 | int i; | |
1da177e4 | 1440 | |
529983ec | 1441 | for (i = 0; i <= init_net.xfrm.state_hmask; i++) { |
8f126e37 DM |
1442 | struct hlist_node *entry; |
1443 | struct xfrm_state *x; | |
1444 | ||
73d189dc | 1445 | hlist_for_each_entry(x, entry, init_net.xfrm.state_bydst+i, bydst) { |
8f126e37 DM |
1446 | if (x->km.seq == seq && |
1447 | x->km.state == XFRM_STATE_ACQ) { | |
1da177e4 LT |
1448 | xfrm_state_hold(x); |
1449 | return x; | |
1450 | } | |
1451 | } | |
1452 | } | |
1453 | return NULL; | |
1454 | } | |
1455 | ||
1456 | struct xfrm_state *xfrm_find_acq_byseq(u32 seq) | |
1457 | { | |
1458 | struct xfrm_state *x; | |
1459 | ||
1460 | spin_lock_bh(&xfrm_state_lock); | |
1461 | x = __xfrm_find_acq_byseq(seq); | |
1462 | spin_unlock_bh(&xfrm_state_lock); | |
1463 | return x; | |
1464 | } | |
1465 | EXPORT_SYMBOL(xfrm_find_acq_byseq); | |
1466 | ||
1467 | u32 xfrm_get_acqseq(void) | |
1468 | { | |
1469 | u32 res; | |
1470 | static u32 acqseq; | |
1471 | static DEFINE_SPINLOCK(acqseq_lock); | |
1472 | ||
1473 | spin_lock_bh(&acqseq_lock); | |
1474 | res = (++acqseq ? : ++acqseq); | |
1475 | spin_unlock_bh(&acqseq_lock); | |
1476 | return res; | |
1477 | } | |
1478 | EXPORT_SYMBOL(xfrm_get_acqseq); | |
1479 | ||
658b219e | 1480 | int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high) |
1da177e4 | 1481 | { |
f034b5d4 | 1482 | unsigned int h; |
1da177e4 | 1483 | struct xfrm_state *x0; |
658b219e HX |
1484 | int err = -ENOENT; |
1485 | __be32 minspi = htonl(low); | |
1486 | __be32 maxspi = htonl(high); | |
1da177e4 | 1487 | |
658b219e HX |
1488 | spin_lock_bh(&x->lock); |
1489 | if (x->km.state == XFRM_STATE_DEAD) | |
1490 | goto unlock; | |
1491 | ||
1492 | err = 0; | |
1da177e4 | 1493 | if (x->id.spi) |
658b219e HX |
1494 | goto unlock; |
1495 | ||
1496 | err = -ENOENT; | |
1da177e4 LT |
1497 | |
1498 | if (minspi == maxspi) { | |
1499 | x0 = xfrm_state_lookup(&x->id.daddr, minspi, x->id.proto, x->props.family); | |
1500 | if (x0) { | |
1501 | xfrm_state_put(x0); | |
658b219e | 1502 | goto unlock; |
1da177e4 LT |
1503 | } |
1504 | x->id.spi = minspi; | |
1505 | } else { | |
1506 | u32 spi = 0; | |
26977b4e AV |
1507 | for (h=0; h<high-low+1; h++) { |
1508 | spi = low + net_random()%(high-low+1); | |
1da177e4 LT |
1509 | x0 = xfrm_state_lookup(&x->id.daddr, htonl(spi), x->id.proto, x->props.family); |
1510 | if (x0 == NULL) { | |
1511 | x->id.spi = htonl(spi); | |
1512 | break; | |
1513 | } | |
1514 | xfrm_state_put(x0); | |
1515 | } | |
1516 | } | |
1517 | if (x->id.spi) { | |
1518 | spin_lock_bh(&xfrm_state_lock); | |
64d0cd00 | 1519 | h = xfrm_spi_hash(&init_net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family); |
b754a4fd | 1520 | hlist_add_head(&x->byspi, init_net.xfrm.state_byspi+h); |
1da177e4 | 1521 | spin_unlock_bh(&xfrm_state_lock); |
658b219e HX |
1522 | |
1523 | err = 0; | |
1da177e4 | 1524 | } |
658b219e HX |
1525 | |
1526 | unlock: | |
1527 | spin_unlock_bh(&x->lock); | |
1528 | ||
1529 | return err; | |
1da177e4 LT |
1530 | } |
1531 | EXPORT_SYMBOL(xfrm_alloc_spi); | |
1532 | ||
4c563f76 TT |
1533 | int xfrm_state_walk(struct xfrm_state_walk *walk, |
1534 | int (*func)(struct xfrm_state *, int, void*), | |
1da177e4 LT |
1535 | void *data) |
1536 | { | |
12a169e7 HX |
1537 | struct xfrm_state *state; |
1538 | struct xfrm_state_walk *x; | |
1da177e4 LT |
1539 | int err = 0; |
1540 | ||
12a169e7 | 1541 | if (walk->seq != 0 && list_empty(&walk->all)) |
4c563f76 TT |
1542 | return 0; |
1543 | ||
1da177e4 | 1544 | spin_lock_bh(&xfrm_state_lock); |
12a169e7 | 1545 | if (list_empty(&walk->all)) |
9d4139c7 | 1546 | x = list_first_entry(&init_net.xfrm.state_all, struct xfrm_state_walk, all); |
12a169e7 HX |
1547 | else |
1548 | x = list_entry(&walk->all, struct xfrm_state_walk, all); | |
9d4139c7 | 1549 | list_for_each_entry_from(x, &init_net.xfrm.state_all, all) { |
12a169e7 | 1550 | if (x->state == XFRM_STATE_DEAD) |
4c563f76 | 1551 | continue; |
12a169e7 HX |
1552 | state = container_of(x, struct xfrm_state, km); |
1553 | if (!xfrm_id_proto_match(state->id.proto, walk->proto)) | |
4c563f76 | 1554 | continue; |
12a169e7 HX |
1555 | err = func(state, walk->seq, data); |
1556 | if (err) { | |
1557 | list_move_tail(&walk->all, &x->all); | |
1558 | goto out; | |
1da177e4 | 1559 | } |
12a169e7 | 1560 | walk->seq++; |
1da177e4 | 1561 | } |
12a169e7 | 1562 | if (walk->seq == 0) { |
1da177e4 LT |
1563 | err = -ENOENT; |
1564 | goto out; | |
1565 | } | |
12a169e7 | 1566 | list_del_init(&walk->all); |
1da177e4 LT |
1567 | out: |
1568 | spin_unlock_bh(&xfrm_state_lock); | |
1569 | return err; | |
1570 | } | |
1571 | EXPORT_SYMBOL(xfrm_state_walk); | |
1572 | ||
5c182458 HX |
1573 | void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto) |
1574 | { | |
12a169e7 | 1575 | INIT_LIST_HEAD(&walk->all); |
5c182458 | 1576 | walk->proto = proto; |
12a169e7 HX |
1577 | walk->state = XFRM_STATE_DEAD; |
1578 | walk->seq = 0; | |
5c182458 HX |
1579 | } |
1580 | EXPORT_SYMBOL(xfrm_state_walk_init); | |
1581 | ||
abb81c4f HX |
1582 | void xfrm_state_walk_done(struct xfrm_state_walk *walk) |
1583 | { | |
12a169e7 | 1584 | if (list_empty(&walk->all)) |
5c182458 | 1585 | return; |
5c182458 | 1586 | |
12a169e7 HX |
1587 | spin_lock_bh(&xfrm_state_lock); |
1588 | list_del(&walk->all); | |
1589 | spin_lock_bh(&xfrm_state_lock); | |
abb81c4f HX |
1590 | } |
1591 | EXPORT_SYMBOL(xfrm_state_walk_done); | |
1592 | ||
f8cd5488 JHS |
1593 | |
1594 | void xfrm_replay_notify(struct xfrm_state *x, int event) | |
1595 | { | |
1596 | struct km_event c; | |
1597 | /* we send notify messages in case | |
1598 | * 1. we updated on of the sequence numbers, and the seqno difference | |
1599 | * is at least x->replay_maxdiff, in this case we also update the | |
1600 | * timeout of our timer function | |
1601 | * 2. if x->replay_maxage has elapsed since last update, | |
1602 | * and there were changes | |
1603 | * | |
1604 | * The state structure must be locked! | |
1605 | */ | |
1606 | ||
1607 | switch (event) { | |
1608 | case XFRM_REPLAY_UPDATE: | |
1609 | if (x->replay_maxdiff && | |
1610 | (x->replay.seq - x->preplay.seq < x->replay_maxdiff) && | |
2717096a JHS |
1611 | (x->replay.oseq - x->preplay.oseq < x->replay_maxdiff)) { |
1612 | if (x->xflags & XFRM_TIME_DEFER) | |
1613 | event = XFRM_REPLAY_TIMEOUT; | |
1614 | else | |
1615 | return; | |
1616 | } | |
f8cd5488 JHS |
1617 | |
1618 | break; | |
1619 | ||
1620 | case XFRM_REPLAY_TIMEOUT: | |
1621 | if ((x->replay.seq == x->preplay.seq) && | |
1622 | (x->replay.bitmap == x->preplay.bitmap) && | |
2717096a JHS |
1623 | (x->replay.oseq == x->preplay.oseq)) { |
1624 | x->xflags |= XFRM_TIME_DEFER; | |
f8cd5488 | 1625 | return; |
2717096a | 1626 | } |
f8cd5488 JHS |
1627 | |
1628 | break; | |
1629 | } | |
1630 | ||
1631 | memcpy(&x->preplay, &x->replay, sizeof(struct xfrm_replay_state)); | |
1632 | c.event = XFRM_MSG_NEWAE; | |
1633 | c.data.aevent = event; | |
1634 | km_state_notify(x, &c); | |
1635 | ||
f8cd5488 | 1636 | if (x->replay_maxage && |
a47f0ce0 | 1637 | !mod_timer(&x->rtimer, jiffies + x->replay_maxage)) |
2717096a | 1638 | x->xflags &= ~XFRM_TIME_DEFER; |
f8cd5488 JHS |
1639 | } |
1640 | ||
1641 | static void xfrm_replay_timer_handler(unsigned long data) | |
1642 | { | |
1643 | struct xfrm_state *x = (struct xfrm_state*)data; | |
1644 | ||
1645 | spin_lock(&x->lock); | |
1646 | ||
2717096a JHS |
1647 | if (x->km.state == XFRM_STATE_VALID) { |
1648 | if (xfrm_aevent_is_on()) | |
1649 | xfrm_replay_notify(x, XFRM_REPLAY_TIMEOUT); | |
1650 | else | |
1651 | x->xflags |= XFRM_TIME_DEFER; | |
1652 | } | |
f8cd5488 JHS |
1653 | |
1654 | spin_unlock(&x->lock); | |
1655 | } | |
1656 | ||
afeb14b4 PM |
1657 | int xfrm_replay_check(struct xfrm_state *x, |
1658 | struct sk_buff *skb, __be32 net_seq) | |
1da177e4 LT |
1659 | { |
1660 | u32 diff; | |
a252cc23 | 1661 | u32 seq = ntohl(net_seq); |
1da177e4 LT |
1662 | |
1663 | if (unlikely(seq == 0)) | |
afeb14b4 | 1664 | goto err; |
1da177e4 LT |
1665 | |
1666 | if (likely(seq > x->replay.seq)) | |
1667 | return 0; | |
1668 | ||
1669 | diff = x->replay.seq - seq; | |
4c4d51a7 HX |
1670 | if (diff >= min_t(unsigned int, x->props.replay_window, |
1671 | sizeof(x->replay.bitmap) * 8)) { | |
1da177e4 | 1672 | x->stats.replay_window++; |
afeb14b4 | 1673 | goto err; |
1da177e4 LT |
1674 | } |
1675 | ||
1676 | if (x->replay.bitmap & (1U << diff)) { | |
1677 | x->stats.replay++; | |
afeb14b4 | 1678 | goto err; |
1da177e4 LT |
1679 | } |
1680 | return 0; | |
afeb14b4 PM |
1681 | |
1682 | err: | |
1683 | xfrm_audit_state_replay(x, skb, net_seq); | |
1684 | return -EINVAL; | |
1da177e4 | 1685 | } |
1da177e4 | 1686 | |
61f4627b | 1687 | void xfrm_replay_advance(struct xfrm_state *x, __be32 net_seq) |
1da177e4 LT |
1688 | { |
1689 | u32 diff; | |
61f4627b | 1690 | u32 seq = ntohl(net_seq); |
1da177e4 LT |
1691 | |
1692 | if (seq > x->replay.seq) { | |
1693 | diff = seq - x->replay.seq; | |
1694 | if (diff < x->props.replay_window) | |
1695 | x->replay.bitmap = ((x->replay.bitmap) << diff) | 1; | |
1696 | else | |
1697 | x->replay.bitmap = 1; | |
1698 | x->replay.seq = seq; | |
1699 | } else { | |
1700 | diff = x->replay.seq - seq; | |
1701 | x->replay.bitmap |= (1U << diff); | |
1702 | } | |
f8cd5488 JHS |
1703 | |
1704 | if (xfrm_aevent_is_on()) | |
1705 | xfrm_replay_notify(x, XFRM_REPLAY_UPDATE); | |
1da177e4 | 1706 | } |
1da177e4 | 1707 | |
df01812e | 1708 | static LIST_HEAD(xfrm_km_list); |
1da177e4 LT |
1709 | static DEFINE_RWLOCK(xfrm_km_lock); |
1710 | ||
26b15dad | 1711 | void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c) |
1da177e4 LT |
1712 | { |
1713 | struct xfrm_mgr *km; | |
1714 | ||
26b15dad JHS |
1715 | read_lock(&xfrm_km_lock); |
1716 | list_for_each_entry(km, &xfrm_km_list, list) | |
1717 | if (km->notify_policy) | |
1718 | km->notify_policy(xp, dir, c); | |
1719 | read_unlock(&xfrm_km_lock); | |
1720 | } | |
1da177e4 | 1721 | |
26b15dad JHS |
1722 | void km_state_notify(struct xfrm_state *x, struct km_event *c) |
1723 | { | |
1724 | struct xfrm_mgr *km; | |
1da177e4 LT |
1725 | read_lock(&xfrm_km_lock); |
1726 | list_for_each_entry(km, &xfrm_km_list, list) | |
26b15dad JHS |
1727 | if (km->notify) |
1728 | km->notify(x, c); | |
1da177e4 | 1729 | read_unlock(&xfrm_km_lock); |
26b15dad JHS |
1730 | } |
1731 | ||
1732 | EXPORT_SYMBOL(km_policy_notify); | |
1733 | EXPORT_SYMBOL(km_state_notify); | |
1734 | ||
53bc6b4d | 1735 | void km_state_expired(struct xfrm_state *x, int hard, u32 pid) |
26b15dad JHS |
1736 | { |
1737 | struct km_event c; | |
1738 | ||
bf08867f | 1739 | c.data.hard = hard; |
53bc6b4d | 1740 | c.pid = pid; |
f60f6b8f | 1741 | c.event = XFRM_MSG_EXPIRE; |
26b15dad | 1742 | km_state_notify(x, &c); |
1da177e4 LT |
1743 | |
1744 | if (hard) | |
50a30657 | 1745 | wake_up(&init_net.xfrm.km_waitq); |
1da177e4 LT |
1746 | } |
1747 | ||
53bc6b4d | 1748 | EXPORT_SYMBOL(km_state_expired); |
26b15dad JHS |
1749 | /* |
1750 | * We send to all registered managers regardless of failure | |
1751 | * We are happy with one success | |
1752 | */ | |
980ebd25 | 1753 | int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol) |
1da177e4 | 1754 | { |
26b15dad | 1755 | int err = -EINVAL, acqret; |
1da177e4 LT |
1756 | struct xfrm_mgr *km; |
1757 | ||
1758 | read_lock(&xfrm_km_lock); | |
1759 | list_for_each_entry(km, &xfrm_km_list, list) { | |
26b15dad JHS |
1760 | acqret = km->acquire(x, t, pol, XFRM_POLICY_OUT); |
1761 | if (!acqret) | |
1762 | err = acqret; | |
1da177e4 LT |
1763 | } |
1764 | read_unlock(&xfrm_km_lock); | |
1765 | return err; | |
1766 | } | |
980ebd25 | 1767 | EXPORT_SYMBOL(km_query); |
1da177e4 | 1768 | |
5d36b180 | 1769 | int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport) |
1da177e4 LT |
1770 | { |
1771 | int err = -EINVAL; | |
1772 | struct xfrm_mgr *km; | |
1773 | ||
1774 | read_lock(&xfrm_km_lock); | |
1775 | list_for_each_entry(km, &xfrm_km_list, list) { | |
1776 | if (km->new_mapping) | |
1777 | err = km->new_mapping(x, ipaddr, sport); | |
1778 | if (!err) | |
1779 | break; | |
1780 | } | |
1781 | read_unlock(&xfrm_km_lock); | |
1782 | return err; | |
1783 | } | |
1784 | EXPORT_SYMBOL(km_new_mapping); | |
1785 | ||
6c5c8ca7 | 1786 | void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid) |
1da177e4 | 1787 | { |
26b15dad | 1788 | struct km_event c; |
1da177e4 | 1789 | |
bf08867f | 1790 | c.data.hard = hard; |
6c5c8ca7 | 1791 | c.pid = pid; |
f60f6b8f | 1792 | c.event = XFRM_MSG_POLEXPIRE; |
26b15dad | 1793 | km_policy_notify(pol, dir, &c); |
1da177e4 LT |
1794 | |
1795 | if (hard) | |
50a30657 | 1796 | wake_up(&init_net.xfrm.km_waitq); |
1da177e4 | 1797 | } |
a70fcb0b | 1798 | EXPORT_SYMBOL(km_policy_expired); |
1da177e4 | 1799 | |
2d60abc2 | 1800 | #ifdef CONFIG_XFRM_MIGRATE |
80c9abaa | 1801 | int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type, |
13c1d189 AE |
1802 | struct xfrm_migrate *m, int num_migrate, |
1803 | struct xfrm_kmaddress *k) | |
80c9abaa SS |
1804 | { |
1805 | int err = -EINVAL; | |
1806 | int ret; | |
1807 | struct xfrm_mgr *km; | |
1808 | ||
1809 | read_lock(&xfrm_km_lock); | |
1810 | list_for_each_entry(km, &xfrm_km_list, list) { | |
1811 | if (km->migrate) { | |
13c1d189 | 1812 | ret = km->migrate(sel, dir, type, m, num_migrate, k); |
80c9abaa SS |
1813 | if (!ret) |
1814 | err = ret; | |
1815 | } | |
1816 | } | |
1817 | read_unlock(&xfrm_km_lock); | |
1818 | return err; | |
1819 | } | |
1820 | EXPORT_SYMBOL(km_migrate); | |
2d60abc2 | 1821 | #endif |
80c9abaa | 1822 | |
97a64b45 MN |
1823 | int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr) |
1824 | { | |
1825 | int err = -EINVAL; | |
1826 | int ret; | |
1827 | struct xfrm_mgr *km; | |
1828 | ||
1829 | read_lock(&xfrm_km_lock); | |
1830 | list_for_each_entry(km, &xfrm_km_list, list) { | |
1831 | if (km->report) { | |
1832 | ret = km->report(proto, sel, addr); | |
1833 | if (!ret) | |
1834 | err = ret; | |
1835 | } | |
1836 | } | |
1837 | read_unlock(&xfrm_km_lock); | |
1838 | return err; | |
1839 | } | |
1840 | EXPORT_SYMBOL(km_report); | |
1841 | ||
1da177e4 LT |
1842 | int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen) |
1843 | { | |
1844 | int err; | |
1845 | u8 *data; | |
1846 | struct xfrm_mgr *km; | |
1847 | struct xfrm_policy *pol = NULL; | |
1848 | ||
1849 | if (optlen <= 0 || optlen > PAGE_SIZE) | |
1850 | return -EMSGSIZE; | |
1851 | ||
1852 | data = kmalloc(optlen, GFP_KERNEL); | |
1853 | if (!data) | |
1854 | return -ENOMEM; | |
1855 | ||
1856 | err = -EFAULT; | |
1857 | if (copy_from_user(data, optval, optlen)) | |
1858 | goto out; | |
1859 | ||
1860 | err = -EINVAL; | |
1861 | read_lock(&xfrm_km_lock); | |
1862 | list_for_each_entry(km, &xfrm_km_list, list) { | |
cb969f07 | 1863 | pol = km->compile_policy(sk, optname, data, |
1da177e4 LT |
1864 | optlen, &err); |
1865 | if (err >= 0) | |
1866 | break; | |
1867 | } | |
1868 | read_unlock(&xfrm_km_lock); | |
1869 | ||
1870 | if (err >= 0) { | |
1871 | xfrm_sk_policy_insert(sk, err, pol); | |
1872 | xfrm_pol_put(pol); | |
1873 | err = 0; | |
1874 | } | |
1875 | ||
1876 | out: | |
1877 | kfree(data); | |
1878 | return err; | |
1879 | } | |
1880 | EXPORT_SYMBOL(xfrm_user_policy); | |
1881 | ||
1882 | int xfrm_register_km(struct xfrm_mgr *km) | |
1883 | { | |
1884 | write_lock_bh(&xfrm_km_lock); | |
1885 | list_add_tail(&km->list, &xfrm_km_list); | |
1886 | write_unlock_bh(&xfrm_km_lock); | |
1887 | return 0; | |
1888 | } | |
1889 | EXPORT_SYMBOL(xfrm_register_km); | |
1890 | ||
1891 | int xfrm_unregister_km(struct xfrm_mgr *km) | |
1892 | { | |
1893 | write_lock_bh(&xfrm_km_lock); | |
1894 | list_del(&km->list); | |
1895 | write_unlock_bh(&xfrm_km_lock); | |
1896 | return 0; | |
1897 | } | |
1898 | EXPORT_SYMBOL(xfrm_unregister_km); | |
1899 | ||
1900 | int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo) | |
1901 | { | |
1902 | int err = 0; | |
1903 | if (unlikely(afinfo == NULL)) | |
1904 | return -EINVAL; | |
1905 | if (unlikely(afinfo->family >= NPROTO)) | |
1906 | return -EAFNOSUPPORT; | |
f3111502 | 1907 | write_lock_bh(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1908 | if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL)) |
1909 | err = -ENOBUFS; | |
edcd5821 | 1910 | else |
1da177e4 | 1911 | xfrm_state_afinfo[afinfo->family] = afinfo; |
f3111502 | 1912 | write_unlock_bh(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1913 | return err; |
1914 | } | |
1915 | EXPORT_SYMBOL(xfrm_state_register_afinfo); | |
1916 | ||
1917 | int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo) | |
1918 | { | |
1919 | int err = 0; | |
1920 | if (unlikely(afinfo == NULL)) | |
1921 | return -EINVAL; | |
1922 | if (unlikely(afinfo->family >= NPROTO)) | |
1923 | return -EAFNOSUPPORT; | |
f3111502 | 1924 | write_lock_bh(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1925 | if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) { |
1926 | if (unlikely(xfrm_state_afinfo[afinfo->family] != afinfo)) | |
1927 | err = -EINVAL; | |
edcd5821 | 1928 | else |
1da177e4 | 1929 | xfrm_state_afinfo[afinfo->family] = NULL; |
1da177e4 | 1930 | } |
f3111502 | 1931 | write_unlock_bh(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1932 | return err; |
1933 | } | |
1934 | EXPORT_SYMBOL(xfrm_state_unregister_afinfo); | |
1935 | ||
17c2a42a | 1936 | static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family) |
1da177e4 LT |
1937 | { |
1938 | struct xfrm_state_afinfo *afinfo; | |
1939 | if (unlikely(family >= NPROTO)) | |
1940 | return NULL; | |
1941 | read_lock(&xfrm_state_afinfo_lock); | |
1942 | afinfo = xfrm_state_afinfo[family]; | |
546be240 HX |
1943 | if (unlikely(!afinfo)) |
1944 | read_unlock(&xfrm_state_afinfo_lock); | |
1da177e4 LT |
1945 | return afinfo; |
1946 | } | |
1947 | ||
17c2a42a | 1948 | static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo) |
9a429c49 | 1949 | __releases(xfrm_state_afinfo_lock) |
1da177e4 | 1950 | { |
546be240 | 1951 | read_unlock(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1952 | } |
1953 | ||
1954 | /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */ | |
1955 | void xfrm_state_delete_tunnel(struct xfrm_state *x) | |
1956 | { | |
1957 | if (x->tunnel) { | |
1958 | struct xfrm_state *t = x->tunnel; | |
1959 | ||
1960 | if (atomic_read(&t->tunnel_users) == 2) | |
1961 | xfrm_state_delete(t); | |
1962 | atomic_dec(&t->tunnel_users); | |
1963 | xfrm_state_put(t); | |
1964 | x->tunnel = NULL; | |
1965 | } | |
1966 | } | |
1967 | EXPORT_SYMBOL(xfrm_state_delete_tunnel); | |
1968 | ||
1969 | int xfrm_state_mtu(struct xfrm_state *x, int mtu) | |
1970 | { | |
c5c25238 | 1971 | int res; |
1da177e4 | 1972 | |
c5c25238 PM |
1973 | spin_lock_bh(&x->lock); |
1974 | if (x->km.state == XFRM_STATE_VALID && | |
1975 | x->type && x->type->get_mtu) | |
1976 | res = x->type->get_mtu(x, mtu); | |
1977 | else | |
28121617 | 1978 | res = mtu - x->props.header_len; |
c5c25238 | 1979 | spin_unlock_bh(&x->lock); |
1da177e4 LT |
1980 | return res; |
1981 | } | |
1982 | ||
72cb6962 HX |
1983 | int xfrm_init_state(struct xfrm_state *x) |
1984 | { | |
d094cd83 | 1985 | struct xfrm_state_afinfo *afinfo; |
df9dcb45 | 1986 | struct xfrm_mode *inner_mode; |
d094cd83 | 1987 | int family = x->props.family; |
72cb6962 HX |
1988 | int err; |
1989 | ||
d094cd83 HX |
1990 | err = -EAFNOSUPPORT; |
1991 | afinfo = xfrm_state_get_afinfo(family); | |
1992 | if (!afinfo) | |
1993 | goto error; | |
1994 | ||
1995 | err = 0; | |
1996 | if (afinfo->init_flags) | |
1997 | err = afinfo->init_flags(x); | |
1998 | ||
1999 | xfrm_state_put_afinfo(afinfo); | |
2000 | ||
2001 | if (err) | |
2002 | goto error; | |
2003 | ||
2004 | err = -EPROTONOSUPPORT; | |
13996378 | 2005 | |
df9dcb45 KM |
2006 | if (x->sel.family != AF_UNSPEC) { |
2007 | inner_mode = xfrm_get_mode(x->props.mode, x->sel.family); | |
2008 | if (inner_mode == NULL) | |
2009 | goto error; | |
2010 | ||
2011 | if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) && | |
2012 | family != x->sel.family) { | |
2013 | xfrm_put_mode(inner_mode); | |
2014 | goto error; | |
2015 | } | |
2016 | ||
2017 | x->inner_mode = inner_mode; | |
2018 | } else { | |
2019 | struct xfrm_mode *inner_mode_iaf; | |
2020 | ||
2021 | inner_mode = xfrm_get_mode(x->props.mode, AF_INET); | |
2022 | if (inner_mode == NULL) | |
2023 | goto error; | |
2024 | ||
2025 | if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL)) { | |
2026 | xfrm_put_mode(inner_mode); | |
2027 | goto error; | |
2028 | } | |
2029 | ||
2030 | inner_mode_iaf = xfrm_get_mode(x->props.mode, AF_INET6); | |
2031 | if (inner_mode_iaf == NULL) | |
2032 | goto error; | |
2033 | ||
2034 | if (!(inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL)) { | |
2035 | xfrm_put_mode(inner_mode_iaf); | |
2036 | goto error; | |
2037 | } | |
2038 | ||
2039 | if (x->props.family == AF_INET) { | |
2040 | x->inner_mode = inner_mode; | |
2041 | x->inner_mode_iaf = inner_mode_iaf; | |
2042 | } else { | |
2043 | x->inner_mode = inner_mode_iaf; | |
2044 | x->inner_mode_iaf = inner_mode; | |
2045 | } | |
2046 | } | |
13996378 | 2047 | |
d094cd83 | 2048 | x->type = xfrm_get_type(x->id.proto, family); |
72cb6962 HX |
2049 | if (x->type == NULL) |
2050 | goto error; | |
2051 | ||
2052 | err = x->type->init_state(x); | |
2053 | if (err) | |
2054 | goto error; | |
2055 | ||
13996378 HX |
2056 | x->outer_mode = xfrm_get_mode(x->props.mode, family); |
2057 | if (x->outer_mode == NULL) | |
b59f45d0 HX |
2058 | goto error; |
2059 | ||
72cb6962 HX |
2060 | x->km.state = XFRM_STATE_VALID; |
2061 | ||
2062 | error: | |
2063 | return err; | |
2064 | } | |
2065 | ||
2066 | EXPORT_SYMBOL(xfrm_init_state); | |
a716c119 | 2067 | |
d62ddc21 | 2068 | int __net_init xfrm_state_init(struct net *net) |
1da177e4 | 2069 | { |
f034b5d4 DM |
2070 | unsigned int sz; |
2071 | ||
9d4139c7 AD |
2072 | INIT_LIST_HEAD(&net->xfrm.state_all); |
2073 | ||
f034b5d4 DM |
2074 | sz = sizeof(struct hlist_head) * 8; |
2075 | ||
73d189dc AD |
2076 | net->xfrm.state_bydst = xfrm_hash_alloc(sz); |
2077 | if (!net->xfrm.state_bydst) | |
2078 | goto out_bydst; | |
d320bbb3 AD |
2079 | net->xfrm.state_bysrc = xfrm_hash_alloc(sz); |
2080 | if (!net->xfrm.state_bysrc) | |
2081 | goto out_bysrc; | |
b754a4fd AD |
2082 | net->xfrm.state_byspi = xfrm_hash_alloc(sz); |
2083 | if (!net->xfrm.state_byspi) | |
2084 | goto out_byspi; | |
529983ec | 2085 | net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1); |
1da177e4 | 2086 | |
0bf7c5b0 | 2087 | net->xfrm.state_num = 0; |
63082733 | 2088 | INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize); |
b8a0ae20 | 2089 | INIT_HLIST_HEAD(&net->xfrm.state_gc_list); |
c7837144 | 2090 | INIT_WORK(&net->xfrm.state_gc_work, xfrm_state_gc_task); |
50a30657 | 2091 | init_waitqueue_head(&net->xfrm.km_waitq); |
d62ddc21 | 2092 | return 0; |
73d189dc | 2093 | |
b754a4fd AD |
2094 | out_byspi: |
2095 | xfrm_hash_free(net->xfrm.state_bysrc, sz); | |
d320bbb3 AD |
2096 | out_bysrc: |
2097 | xfrm_hash_free(net->xfrm.state_bydst, sz); | |
73d189dc AD |
2098 | out_bydst: |
2099 | return -ENOMEM; | |
d62ddc21 AD |
2100 | } |
2101 | ||
2102 | void xfrm_state_fini(struct net *net) | |
2103 | { | |
73d189dc AD |
2104 | unsigned int sz; |
2105 | ||
9d4139c7 | 2106 | WARN_ON(!list_empty(&net->xfrm.state_all)); |
73d189dc | 2107 | |
529983ec | 2108 | sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head); |
b754a4fd AD |
2109 | WARN_ON(!hlist_empty(net->xfrm.state_byspi)); |
2110 | xfrm_hash_free(net->xfrm.state_byspi, sz); | |
d320bbb3 AD |
2111 | WARN_ON(!hlist_empty(net->xfrm.state_bysrc)); |
2112 | xfrm_hash_free(net->xfrm.state_bysrc, sz); | |
73d189dc AD |
2113 | WARN_ON(!hlist_empty(net->xfrm.state_bydst)); |
2114 | xfrm_hash_free(net->xfrm.state_bydst, sz); | |
1da177e4 LT |
2115 | } |
2116 | ||
ab5f5e8b | 2117 | #ifdef CONFIG_AUDITSYSCALL |
cf35f43e IJ |
2118 | static void xfrm_audit_helper_sainfo(struct xfrm_state *x, |
2119 | struct audit_buffer *audit_buf) | |
ab5f5e8b | 2120 | { |
68277acc PM |
2121 | struct xfrm_sec_ctx *ctx = x->security; |
2122 | u32 spi = ntohl(x->id.spi); | |
2123 | ||
2124 | if (ctx) | |
ab5f5e8b | 2125 | audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s", |
68277acc | 2126 | ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str); |
ab5f5e8b JL |
2127 | |
2128 | switch(x->props.family) { | |
2129 | case AF_INET: | |
21454aaa HH |
2130 | audit_log_format(audit_buf, " src=%pI4 dst=%pI4", |
2131 | &x->props.saddr.a4, &x->id.daddr.a4); | |
ab5f5e8b JL |
2132 | break; |
2133 | case AF_INET6: | |
5b095d98 | 2134 | audit_log_format(audit_buf, " src=%pI6 dst=%pI6", |
fdb46ee7 | 2135 | x->props.saddr.a6, x->id.daddr.a6); |
ab5f5e8b JL |
2136 | break; |
2137 | } | |
68277acc PM |
2138 | |
2139 | audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi); | |
ab5f5e8b JL |
2140 | } |
2141 | ||
cf35f43e IJ |
2142 | static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family, |
2143 | struct audit_buffer *audit_buf) | |
afeb14b4 PM |
2144 | { |
2145 | struct iphdr *iph4; | |
2146 | struct ipv6hdr *iph6; | |
2147 | ||
2148 | switch (family) { | |
2149 | case AF_INET: | |
2150 | iph4 = ip_hdr(skb); | |
21454aaa HH |
2151 | audit_log_format(audit_buf, " src=%pI4 dst=%pI4", |
2152 | &iph4->saddr, &iph4->daddr); | |
afeb14b4 PM |
2153 | break; |
2154 | case AF_INET6: | |
2155 | iph6 = ipv6_hdr(skb); | |
2156 | audit_log_format(audit_buf, | |
5b095d98 | 2157 | " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x", |
fdb46ee7 | 2158 | &iph6->saddr,&iph6->daddr, |
afeb14b4 PM |
2159 | iph6->flow_lbl[0] & 0x0f, |
2160 | iph6->flow_lbl[1], | |
2161 | iph6->flow_lbl[2]); | |
2162 | break; | |
2163 | } | |
2164 | } | |
2165 | ||
68277acc | 2166 | void xfrm_audit_state_add(struct xfrm_state *x, int result, |
2532386f | 2167 | uid_t auid, u32 sessionid, u32 secid) |
ab5f5e8b JL |
2168 | { |
2169 | struct audit_buffer *audit_buf; | |
ab5f5e8b | 2170 | |
afeb14b4 | 2171 | audit_buf = xfrm_audit_start("SAD-add"); |
ab5f5e8b JL |
2172 | if (audit_buf == NULL) |
2173 | return; | |
2532386f | 2174 | xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); |
afeb14b4 PM |
2175 | xfrm_audit_helper_sainfo(x, audit_buf); |
2176 | audit_log_format(audit_buf, " res=%u", result); | |
ab5f5e8b JL |
2177 | audit_log_end(audit_buf); |
2178 | } | |
2179 | EXPORT_SYMBOL_GPL(xfrm_audit_state_add); | |
2180 | ||
68277acc | 2181 | void xfrm_audit_state_delete(struct xfrm_state *x, int result, |
2532386f | 2182 | uid_t auid, u32 sessionid, u32 secid) |
ab5f5e8b JL |
2183 | { |
2184 | struct audit_buffer *audit_buf; | |
ab5f5e8b | 2185 | |
afeb14b4 | 2186 | audit_buf = xfrm_audit_start("SAD-delete"); |
ab5f5e8b JL |
2187 | if (audit_buf == NULL) |
2188 | return; | |
2532386f | 2189 | xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); |
afeb14b4 PM |
2190 | xfrm_audit_helper_sainfo(x, audit_buf); |
2191 | audit_log_format(audit_buf, " res=%u", result); | |
ab5f5e8b JL |
2192 | audit_log_end(audit_buf); |
2193 | } | |
2194 | EXPORT_SYMBOL_GPL(xfrm_audit_state_delete); | |
afeb14b4 PM |
2195 | |
2196 | void xfrm_audit_state_replay_overflow(struct xfrm_state *x, | |
2197 | struct sk_buff *skb) | |
2198 | { | |
2199 | struct audit_buffer *audit_buf; | |
2200 | u32 spi; | |
2201 | ||
2202 | audit_buf = xfrm_audit_start("SA-replay-overflow"); | |
2203 | if (audit_buf == NULL) | |
2204 | return; | |
2205 | xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); | |
2206 | /* don't record the sequence number because it's inherent in this kind | |
2207 | * of audit message */ | |
2208 | spi = ntohl(x->id.spi); | |
2209 | audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi); | |
2210 | audit_log_end(audit_buf); | |
2211 | } | |
2212 | EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow); | |
2213 | ||
2214 | static void xfrm_audit_state_replay(struct xfrm_state *x, | |
2215 | struct sk_buff *skb, __be32 net_seq) | |
2216 | { | |
2217 | struct audit_buffer *audit_buf; | |
2218 | u32 spi; | |
2219 | ||
2220 | audit_buf = xfrm_audit_start("SA-replayed-pkt"); | |
2221 | if (audit_buf == NULL) | |
2222 | return; | |
2223 | xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); | |
2224 | spi = ntohl(x->id.spi); | |
2225 | audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", | |
2226 | spi, spi, ntohl(net_seq)); | |
2227 | audit_log_end(audit_buf); | |
2228 | } | |
2229 | ||
2230 | void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family) | |
2231 | { | |
2232 | struct audit_buffer *audit_buf; | |
2233 | ||
2234 | audit_buf = xfrm_audit_start("SA-notfound"); | |
2235 | if (audit_buf == NULL) | |
2236 | return; | |
2237 | xfrm_audit_helper_pktinfo(skb, family, audit_buf); | |
2238 | audit_log_end(audit_buf); | |
2239 | } | |
2240 | EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple); | |
2241 | ||
2242 | void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, | |
2243 | __be32 net_spi, __be32 net_seq) | |
2244 | { | |
2245 | struct audit_buffer *audit_buf; | |
2246 | u32 spi; | |
2247 | ||
2248 | audit_buf = xfrm_audit_start("SA-notfound"); | |
2249 | if (audit_buf == NULL) | |
2250 | return; | |
2251 | xfrm_audit_helper_pktinfo(skb, family, audit_buf); | |
2252 | spi = ntohl(net_spi); | |
2253 | audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", | |
2254 | spi, spi, ntohl(net_seq)); | |
2255 | audit_log_end(audit_buf); | |
2256 | } | |
2257 | EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound); | |
2258 | ||
2259 | void xfrm_audit_state_icvfail(struct xfrm_state *x, | |
2260 | struct sk_buff *skb, u8 proto) | |
2261 | { | |
2262 | struct audit_buffer *audit_buf; | |
2263 | __be32 net_spi; | |
2264 | __be32 net_seq; | |
2265 | ||
2266 | audit_buf = xfrm_audit_start("SA-icv-failure"); | |
2267 | if (audit_buf == NULL) | |
2268 | return; | |
2269 | xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); | |
2270 | if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) { | |
2271 | u32 spi = ntohl(net_spi); | |
2272 | audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", | |
2273 | spi, spi, ntohl(net_seq)); | |
2274 | } | |
2275 | audit_log_end(audit_buf); | |
2276 | } | |
2277 | EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail); | |
ab5f5e8b | 2278 | #endif /* CONFIG_AUDITSYSCALL */ |