Commit | Line | Data |
---|---|---|
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 | ||
1da177e4 LT |
27 | /* Each xfrm_state may be linked to two tables: |
28 | ||
29 | 1. Hash table by (spi,daddr,ah/esp) to find SA by SPI. (input,ctl) | |
a624c108 | 30 | 2. Hash table by (daddr,family,reqid) to find what SAs exist for given |
1da177e4 LT |
31 | destination/tunnel endpoint. (output) |
32 | */ | |
33 | ||
34 | static DEFINE_SPINLOCK(xfrm_state_lock); | |
35 | ||
f034b5d4 | 36 | static unsigned int xfrm_state_hashmax __read_mostly = 1 * 1024 * 1024; |
9d4a706d | 37 | static unsigned int xfrm_state_genid; |
f034b5d4 | 38 | |
17c2a42a HX |
39 | static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family); |
40 | static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo); | |
41 | ||
afeb14b4 PM |
42 | #ifdef CONFIG_AUDITSYSCALL |
43 | static void xfrm_audit_state_replay(struct xfrm_state *x, | |
44 | struct sk_buff *skb, __be32 net_seq); | |
45 | #else | |
46 | #define xfrm_audit_state_replay(x, s, sq) do { ; } while (0) | |
47 | #endif /* CONFIG_AUDITSYSCALL */ | |
48 | ||
64d0cd00 AD |
49 | static inline unsigned int xfrm_dst_hash(struct net *net, |
50 | xfrm_address_t *daddr, | |
c1969f29 DM |
51 | xfrm_address_t *saddr, |
52 | u32 reqid, | |
a624c108 | 53 | unsigned short family) |
f034b5d4 | 54 | { |
64d0cd00 | 55 | return __xfrm_dst_hash(daddr, saddr, reqid, family, net->xfrm.state_hmask); |
f034b5d4 DM |
56 | } |
57 | ||
64d0cd00 AD |
58 | static inline unsigned int xfrm_src_hash(struct net *net, |
59 | xfrm_address_t *daddr, | |
667bbcb6 | 60 | xfrm_address_t *saddr, |
44e36b42 | 61 | unsigned short family) |
f034b5d4 | 62 | { |
64d0cd00 | 63 | return __xfrm_src_hash(daddr, saddr, family, net->xfrm.state_hmask); |
f034b5d4 DM |
64 | } |
65 | ||
f034b5d4 | 66 | static inline unsigned int |
64d0cd00 | 67 | xfrm_spi_hash(struct net *net, xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family) |
f034b5d4 | 68 | { |
64d0cd00 | 69 | return __xfrm_spi_hash(daddr, spi, proto, family, net->xfrm.state_hmask); |
f034b5d4 DM |
70 | } |
71 | ||
f034b5d4 DM |
72 | static void xfrm_hash_transfer(struct hlist_head *list, |
73 | struct hlist_head *ndsttable, | |
74 | struct hlist_head *nsrctable, | |
75 | struct hlist_head *nspitable, | |
76 | unsigned int nhashmask) | |
77 | { | |
78 | struct hlist_node *entry, *tmp; | |
79 | struct xfrm_state *x; | |
80 | ||
81 | hlist_for_each_entry_safe(x, entry, tmp, list, bydst) { | |
82 | unsigned int h; | |
83 | ||
c1969f29 DM |
84 | h = __xfrm_dst_hash(&x->id.daddr, &x->props.saddr, |
85 | x->props.reqid, x->props.family, | |
86 | nhashmask); | |
f034b5d4 DM |
87 | hlist_add_head(&x->bydst, ndsttable+h); |
88 | ||
667bbcb6 MN |
89 | h = __xfrm_src_hash(&x->id.daddr, &x->props.saddr, |
90 | x->props.family, | |
f034b5d4 DM |
91 | nhashmask); |
92 | hlist_add_head(&x->bysrc, nsrctable+h); | |
93 | ||
7b4dc360 MN |
94 | if (x->id.spi) { |
95 | h = __xfrm_spi_hash(&x->id.daddr, x->id.spi, | |
96 | x->id.proto, x->props.family, | |
97 | nhashmask); | |
98 | hlist_add_head(&x->byspi, nspitable+h); | |
99 | } | |
f034b5d4 DM |
100 | } |
101 | } | |
102 | ||
63082733 | 103 | static unsigned long xfrm_hash_new_size(unsigned int state_hmask) |
f034b5d4 | 104 | { |
63082733 | 105 | return ((state_hmask + 1) << 1) * sizeof(struct hlist_head); |
f034b5d4 DM |
106 | } |
107 | ||
108 | static DEFINE_MUTEX(hash_resize_mutex); | |
109 | ||
63082733 | 110 | static void xfrm_hash_resize(struct work_struct *work) |
f034b5d4 | 111 | { |
63082733 | 112 | struct net *net = container_of(work, struct net, xfrm.state_hash_work); |
f034b5d4 DM |
113 | struct hlist_head *ndst, *nsrc, *nspi, *odst, *osrc, *ospi; |
114 | unsigned long nsize, osize; | |
115 | unsigned int nhashmask, ohashmask; | |
116 | int i; | |
117 | ||
118 | mutex_lock(&hash_resize_mutex); | |
119 | ||
63082733 | 120 | nsize = xfrm_hash_new_size(net->xfrm.state_hmask); |
44e36b42 | 121 | ndst = xfrm_hash_alloc(nsize); |
f034b5d4 DM |
122 | if (!ndst) |
123 | goto out_unlock; | |
44e36b42 | 124 | nsrc = xfrm_hash_alloc(nsize); |
f034b5d4 | 125 | if (!nsrc) { |
44e36b42 | 126 | xfrm_hash_free(ndst, nsize); |
f034b5d4 DM |
127 | goto out_unlock; |
128 | } | |
44e36b42 | 129 | nspi = xfrm_hash_alloc(nsize); |
f034b5d4 | 130 | if (!nspi) { |
44e36b42 DM |
131 | xfrm_hash_free(ndst, nsize); |
132 | xfrm_hash_free(nsrc, nsize); | |
f034b5d4 DM |
133 | goto out_unlock; |
134 | } | |
135 | ||
136 | spin_lock_bh(&xfrm_state_lock); | |
137 | ||
138 | nhashmask = (nsize / sizeof(struct hlist_head)) - 1U; | |
63082733 AD |
139 | for (i = net->xfrm.state_hmask; i >= 0; i--) |
140 | xfrm_hash_transfer(net->xfrm.state_bydst+i, ndst, nsrc, nspi, | |
f034b5d4 DM |
141 | nhashmask); |
142 | ||
63082733 AD |
143 | odst = net->xfrm.state_bydst; |
144 | osrc = net->xfrm.state_bysrc; | |
145 | ospi = net->xfrm.state_byspi; | |
146 | ohashmask = net->xfrm.state_hmask; | |
f034b5d4 | 147 | |
63082733 AD |
148 | net->xfrm.state_bydst = ndst; |
149 | net->xfrm.state_bysrc = nsrc; | |
150 | net->xfrm.state_byspi = nspi; | |
151 | net->xfrm.state_hmask = nhashmask; | |
f034b5d4 DM |
152 | |
153 | spin_unlock_bh(&xfrm_state_lock); | |
154 | ||
155 | osize = (ohashmask + 1) * sizeof(struct hlist_head); | |
44e36b42 DM |
156 | xfrm_hash_free(odst, osize); |
157 | xfrm_hash_free(osrc, osize); | |
158 | xfrm_hash_free(ospi, osize); | |
f034b5d4 DM |
159 | |
160 | out_unlock: | |
161 | mutex_unlock(&hash_resize_mutex); | |
162 | } | |
163 | ||
1da177e4 LT |
164 | static DEFINE_RWLOCK(xfrm_state_afinfo_lock); |
165 | static struct xfrm_state_afinfo *xfrm_state_afinfo[NPROTO]; | |
166 | ||
1da177e4 LT |
167 | static DEFINE_SPINLOCK(xfrm_state_gc_lock); |
168 | ||
53bc6b4d | 169 | int __xfrm_state_delete(struct xfrm_state *x); |
1da177e4 | 170 | |
980ebd25 | 171 | int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol); |
53bc6b4d | 172 | void km_state_expired(struct xfrm_state *x, int hard, u32 pid); |
1da177e4 | 173 | |
aa5d62cc HX |
174 | static struct xfrm_state_afinfo *xfrm_state_lock_afinfo(unsigned int family) |
175 | { | |
176 | struct xfrm_state_afinfo *afinfo; | |
177 | if (unlikely(family >= NPROTO)) | |
178 | return NULL; | |
179 | write_lock_bh(&xfrm_state_afinfo_lock); | |
180 | afinfo = xfrm_state_afinfo[family]; | |
181 | if (unlikely(!afinfo)) | |
182 | write_unlock_bh(&xfrm_state_afinfo_lock); | |
183 | return afinfo; | |
184 | } | |
185 | ||
186 | static void xfrm_state_unlock_afinfo(struct xfrm_state_afinfo *afinfo) | |
9a429c49 | 187 | __releases(xfrm_state_afinfo_lock) |
aa5d62cc HX |
188 | { |
189 | write_unlock_bh(&xfrm_state_afinfo_lock); | |
190 | } | |
191 | ||
533cb5b0 | 192 | int xfrm_register_type(const struct xfrm_type *type, unsigned short family) |
aa5d62cc HX |
193 | { |
194 | struct xfrm_state_afinfo *afinfo = xfrm_state_lock_afinfo(family); | |
533cb5b0 | 195 | const struct xfrm_type **typemap; |
aa5d62cc HX |
196 | int err = 0; |
197 | ||
198 | if (unlikely(afinfo == NULL)) | |
199 | return -EAFNOSUPPORT; | |
200 | typemap = afinfo->type_map; | |
201 | ||
202 | if (likely(typemap[type->proto] == NULL)) | |
203 | typemap[type->proto] = type; | |
204 | else | |
205 | err = -EEXIST; | |
206 | xfrm_state_unlock_afinfo(afinfo); | |
207 | return err; | |
208 | } | |
209 | EXPORT_SYMBOL(xfrm_register_type); | |
210 | ||
533cb5b0 | 211 | int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family) |
aa5d62cc HX |
212 | { |
213 | struct xfrm_state_afinfo *afinfo = xfrm_state_lock_afinfo(family); | |
533cb5b0 | 214 | const struct xfrm_type **typemap; |
aa5d62cc HX |
215 | int err = 0; |
216 | ||
217 | if (unlikely(afinfo == NULL)) | |
218 | return -EAFNOSUPPORT; | |
219 | typemap = afinfo->type_map; | |
220 | ||
221 | if (unlikely(typemap[type->proto] != type)) | |
222 | err = -ENOENT; | |
223 | else | |
224 | typemap[type->proto] = NULL; | |
225 | xfrm_state_unlock_afinfo(afinfo); | |
226 | return err; | |
227 | } | |
228 | EXPORT_SYMBOL(xfrm_unregister_type); | |
229 | ||
533cb5b0 | 230 | static const struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family) |
aa5d62cc HX |
231 | { |
232 | struct xfrm_state_afinfo *afinfo; | |
533cb5b0 ED |
233 | const struct xfrm_type **typemap; |
234 | const struct xfrm_type *type; | |
aa5d62cc HX |
235 | int modload_attempted = 0; |
236 | ||
237 | retry: | |
238 | afinfo = xfrm_state_get_afinfo(family); | |
239 | if (unlikely(afinfo == NULL)) | |
240 | return NULL; | |
241 | typemap = afinfo->type_map; | |
242 | ||
243 | type = typemap[proto]; | |
244 | if (unlikely(type && !try_module_get(type->owner))) | |
245 | type = NULL; | |
246 | if (!type && !modload_attempted) { | |
247 | xfrm_state_put_afinfo(afinfo); | |
248 | request_module("xfrm-type-%d-%d", family, proto); | |
249 | modload_attempted = 1; | |
250 | goto retry; | |
251 | } | |
252 | ||
253 | xfrm_state_put_afinfo(afinfo); | |
254 | return type; | |
255 | } | |
256 | ||
533cb5b0 | 257 | static void xfrm_put_type(const struct xfrm_type *type) |
aa5d62cc HX |
258 | { |
259 | module_put(type->owner); | |
260 | } | |
261 | ||
262 | int xfrm_register_mode(struct xfrm_mode *mode, int family) | |
263 | { | |
264 | struct xfrm_state_afinfo *afinfo; | |
265 | struct xfrm_mode **modemap; | |
266 | int err; | |
267 | ||
268 | if (unlikely(mode->encap >= XFRM_MODE_MAX)) | |
269 | return -EINVAL; | |
270 | ||
271 | afinfo = xfrm_state_lock_afinfo(family); | |
272 | if (unlikely(afinfo == NULL)) | |
273 | return -EAFNOSUPPORT; | |
274 | ||
275 | err = -EEXIST; | |
276 | modemap = afinfo->mode_map; | |
17c2a42a HX |
277 | if (modemap[mode->encap]) |
278 | goto out; | |
aa5d62cc | 279 | |
17c2a42a HX |
280 | err = -ENOENT; |
281 | if (!try_module_get(afinfo->owner)) | |
282 | goto out; | |
283 | ||
284 | mode->afinfo = afinfo; | |
285 | modemap[mode->encap] = mode; | |
286 | err = 0; | |
287 | ||
288 | out: | |
aa5d62cc HX |
289 | xfrm_state_unlock_afinfo(afinfo); |
290 | return err; | |
291 | } | |
292 | EXPORT_SYMBOL(xfrm_register_mode); | |
293 | ||
294 | int xfrm_unregister_mode(struct xfrm_mode *mode, int family) | |
295 | { | |
296 | struct xfrm_state_afinfo *afinfo; | |
297 | struct xfrm_mode **modemap; | |
298 | int err; | |
299 | ||
300 | if (unlikely(mode->encap >= XFRM_MODE_MAX)) | |
301 | return -EINVAL; | |
302 | ||
303 | afinfo = xfrm_state_lock_afinfo(family); | |
304 | if (unlikely(afinfo == NULL)) | |
305 | return -EAFNOSUPPORT; | |
306 | ||
307 | err = -ENOENT; | |
308 | modemap = afinfo->mode_map; | |
309 | if (likely(modemap[mode->encap] == mode)) { | |
310 | modemap[mode->encap] = NULL; | |
17c2a42a | 311 | module_put(mode->afinfo->owner); |
aa5d62cc HX |
312 | err = 0; |
313 | } | |
314 | ||
315 | xfrm_state_unlock_afinfo(afinfo); | |
316 | return err; | |
317 | } | |
318 | EXPORT_SYMBOL(xfrm_unregister_mode); | |
319 | ||
320 | static struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family) | |
321 | { | |
322 | struct xfrm_state_afinfo *afinfo; | |
323 | struct xfrm_mode *mode; | |
324 | int modload_attempted = 0; | |
325 | ||
326 | if (unlikely(encap >= XFRM_MODE_MAX)) | |
327 | return NULL; | |
328 | ||
329 | retry: | |
330 | afinfo = xfrm_state_get_afinfo(family); | |
331 | if (unlikely(afinfo == NULL)) | |
332 | return NULL; | |
333 | ||
334 | mode = afinfo->mode_map[encap]; | |
335 | if (unlikely(mode && !try_module_get(mode->owner))) | |
336 | mode = NULL; | |
337 | if (!mode && !modload_attempted) { | |
338 | xfrm_state_put_afinfo(afinfo); | |
339 | request_module("xfrm-mode-%d-%d", family, encap); | |
340 | modload_attempted = 1; | |
341 | goto retry; | |
342 | } | |
343 | ||
344 | xfrm_state_put_afinfo(afinfo); | |
345 | return mode; | |
346 | } | |
347 | ||
348 | static void xfrm_put_mode(struct xfrm_mode *mode) | |
349 | { | |
350 | module_put(mode->owner); | |
351 | } | |
352 | ||
1da177e4 LT |
353 | static void xfrm_state_gc_destroy(struct xfrm_state *x) |
354 | { | |
a47f0ce0 DM |
355 | del_timer_sync(&x->timer); |
356 | del_timer_sync(&x->rtimer); | |
a51482bd JJ |
357 | kfree(x->aalg); |
358 | kfree(x->ealg); | |
359 | kfree(x->calg); | |
360 | kfree(x->encap); | |
060f02a3 | 361 | kfree(x->coaddr); |
13996378 HX |
362 | if (x->inner_mode) |
363 | xfrm_put_mode(x->inner_mode); | |
df9dcb45 KM |
364 | if (x->inner_mode_iaf) |
365 | xfrm_put_mode(x->inner_mode_iaf); | |
13996378 HX |
366 | if (x->outer_mode) |
367 | xfrm_put_mode(x->outer_mode); | |
1da177e4 LT |
368 | if (x->type) { |
369 | x->type->destructor(x); | |
370 | xfrm_put_type(x->type); | |
371 | } | |
df71837d | 372 | security_xfrm_state_free(x); |
1da177e4 LT |
373 | kfree(x); |
374 | } | |
375 | ||
c7837144 | 376 | static void xfrm_state_gc_task(struct work_struct *work) |
1da177e4 | 377 | { |
c7837144 | 378 | struct net *net = container_of(work, struct net, xfrm.state_gc_work); |
12a169e7 HX |
379 | struct xfrm_state *x; |
380 | struct hlist_node *entry, *tmp; | |
381 | struct hlist_head gc_list; | |
1da177e4 | 382 | |
1da177e4 | 383 | spin_lock_bh(&xfrm_state_gc_lock); |
c7837144 | 384 | hlist_move_list(&net->xfrm.state_gc_list, &gc_list); |
1da177e4 LT |
385 | spin_unlock_bh(&xfrm_state_gc_lock); |
386 | ||
12a169e7 | 387 | hlist_for_each_entry_safe(x, entry, tmp, &gc_list, gclist) |
1da177e4 | 388 | xfrm_state_gc_destroy(x); |
8f126e37 | 389 | |
50a30657 | 390 | wake_up(&net->xfrm.km_waitq); |
1da177e4 LT |
391 | } |
392 | ||
393 | static inline unsigned long make_jiffies(long secs) | |
394 | { | |
395 | if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ) | |
396 | return MAX_SCHEDULE_TIMEOUT-1; | |
397 | else | |
a716c119 | 398 | return secs*HZ; |
1da177e4 LT |
399 | } |
400 | ||
401 | static void xfrm_timer_handler(unsigned long data) | |
402 | { | |
403 | struct xfrm_state *x = (struct xfrm_state*)data; | |
98806f75 | 404 | struct net *net = xs_net(x); |
9d729f72 | 405 | unsigned long now = get_seconds(); |
1da177e4 LT |
406 | long next = LONG_MAX; |
407 | int warn = 0; | |
161a09e7 | 408 | int err = 0; |
1da177e4 LT |
409 | |
410 | spin_lock(&x->lock); | |
411 | if (x->km.state == XFRM_STATE_DEAD) | |
412 | goto out; | |
413 | if (x->km.state == XFRM_STATE_EXPIRED) | |
414 | goto expired; | |
415 | if (x->lft.hard_add_expires_seconds) { | |
416 | long tmo = x->lft.hard_add_expires_seconds + | |
417 | x->curlft.add_time - now; | |
418 | if (tmo <= 0) | |
419 | goto expired; | |
420 | if (tmo < next) | |
421 | next = tmo; | |
422 | } | |
423 | if (x->lft.hard_use_expires_seconds) { | |
424 | long tmo = x->lft.hard_use_expires_seconds + | |
425 | (x->curlft.use_time ? : now) - now; | |
426 | if (tmo <= 0) | |
427 | goto expired; | |
428 | if (tmo < next) | |
429 | next = tmo; | |
430 | } | |
431 | if (x->km.dying) | |
432 | goto resched; | |
433 | if (x->lft.soft_add_expires_seconds) { | |
434 | long tmo = x->lft.soft_add_expires_seconds + | |
435 | x->curlft.add_time - now; | |
436 | if (tmo <= 0) | |
437 | warn = 1; | |
438 | else if (tmo < next) | |
439 | next = tmo; | |
440 | } | |
441 | if (x->lft.soft_use_expires_seconds) { | |
442 | long tmo = x->lft.soft_use_expires_seconds + | |
443 | (x->curlft.use_time ? : now) - now; | |
444 | if (tmo <= 0) | |
445 | warn = 1; | |
446 | else if (tmo < next) | |
447 | next = tmo; | |
448 | } | |
449 | ||
4666faab | 450 | x->km.dying = warn; |
1da177e4 | 451 | if (warn) |
53bc6b4d | 452 | km_state_expired(x, 0, 0); |
1da177e4 | 453 | resched: |
a47f0ce0 DM |
454 | if (next != LONG_MAX) |
455 | mod_timer(&x->timer, jiffies + make_jiffies(next)); | |
456 | ||
1da177e4 LT |
457 | goto out; |
458 | ||
459 | expired: | |
460 | if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0) { | |
461 | x->km.state = XFRM_STATE_EXPIRED; | |
98806f75 | 462 | wake_up(&net->xfrm.km_waitq); |
1da177e4 LT |
463 | next = 2; |
464 | goto resched; | |
465 | } | |
161a09e7 JL |
466 | |
467 | err = __xfrm_state_delete(x); | |
468 | if (!err && x->id.spi) | |
53bc6b4d | 469 | km_state_expired(x, 1, 0); |
1da177e4 | 470 | |
ab5f5e8b | 471 | xfrm_audit_state_delete(x, err ? 0 : 1, |
2532386f EP |
472 | audit_get_loginuid(current), |
473 | audit_get_sessionid(current), 0); | |
161a09e7 | 474 | |
1da177e4 LT |
475 | out: |
476 | spin_unlock(&x->lock); | |
1da177e4 LT |
477 | } |
478 | ||
0ac84752 DM |
479 | static void xfrm_replay_timer_handler(unsigned long data); |
480 | ||
673c09be | 481 | struct xfrm_state *xfrm_state_alloc(struct net *net) |
1da177e4 LT |
482 | { |
483 | struct xfrm_state *x; | |
484 | ||
0da974f4 | 485 | x = kzalloc(sizeof(struct xfrm_state), GFP_ATOMIC); |
1da177e4 LT |
486 | |
487 | if (x) { | |
673c09be | 488 | write_pnet(&x->xs_net, net); |
1da177e4 LT |
489 | atomic_set(&x->refcnt, 1); |
490 | atomic_set(&x->tunnel_users, 0); | |
12a169e7 | 491 | INIT_LIST_HEAD(&x->km.all); |
8f126e37 DM |
492 | INIT_HLIST_NODE(&x->bydst); |
493 | INIT_HLIST_NODE(&x->bysrc); | |
494 | INIT_HLIST_NODE(&x->byspi); | |
b24b8a24 PE |
495 | setup_timer(&x->timer, xfrm_timer_handler, (unsigned long)x); |
496 | setup_timer(&x->rtimer, xfrm_replay_timer_handler, | |
497 | (unsigned long)x); | |
9d729f72 | 498 | x->curlft.add_time = get_seconds(); |
1da177e4 LT |
499 | x->lft.soft_byte_limit = XFRM_INF; |
500 | x->lft.soft_packet_limit = XFRM_INF; | |
501 | x->lft.hard_byte_limit = XFRM_INF; | |
502 | x->lft.hard_packet_limit = XFRM_INF; | |
f8cd5488 JHS |
503 | x->replay_maxage = 0; |
504 | x->replay_maxdiff = 0; | |
df9dcb45 KM |
505 | x->inner_mode = NULL; |
506 | x->inner_mode_iaf = NULL; | |
1da177e4 LT |
507 | spin_lock_init(&x->lock); |
508 | } | |
509 | return x; | |
510 | } | |
511 | EXPORT_SYMBOL(xfrm_state_alloc); | |
512 | ||
513 | void __xfrm_state_destroy(struct xfrm_state *x) | |
514 | { | |
98806f75 AD |
515 | struct net *net = xs_net(x); |
516 | ||
547b792c | 517 | WARN_ON(x->km.state != XFRM_STATE_DEAD); |
1da177e4 LT |
518 | |
519 | spin_lock_bh(&xfrm_state_gc_lock); | |
98806f75 | 520 | hlist_add_head(&x->gclist, &net->xfrm.state_gc_list); |
1da177e4 | 521 | spin_unlock_bh(&xfrm_state_gc_lock); |
98806f75 | 522 | schedule_work(&net->xfrm.state_gc_work); |
1da177e4 LT |
523 | } |
524 | EXPORT_SYMBOL(__xfrm_state_destroy); | |
525 | ||
53bc6b4d | 526 | int __xfrm_state_delete(struct xfrm_state *x) |
1da177e4 | 527 | { |
98806f75 | 528 | struct net *net = xs_net(x); |
26b15dad JHS |
529 | int err = -ESRCH; |
530 | ||
1da177e4 LT |
531 | if (x->km.state != XFRM_STATE_DEAD) { |
532 | x->km.state = XFRM_STATE_DEAD; | |
533 | spin_lock(&xfrm_state_lock); | |
12a169e7 | 534 | list_del(&x->km.all); |
8f126e37 | 535 | hlist_del(&x->bydst); |
8f126e37 | 536 | hlist_del(&x->bysrc); |
a47f0ce0 | 537 | if (x->id.spi) |
8f126e37 | 538 | hlist_del(&x->byspi); |
98806f75 | 539 | net->xfrm.state_num--; |
1da177e4 | 540 | spin_unlock(&xfrm_state_lock); |
1da177e4 | 541 | |
1da177e4 LT |
542 | /* All xfrm_state objects are created by xfrm_state_alloc. |
543 | * The xfrm_state_alloc call gives a reference, and that | |
544 | * is what we are dropping here. | |
545 | */ | |
5dba4797 | 546 | xfrm_state_put(x); |
26b15dad | 547 | err = 0; |
1da177e4 | 548 | } |
26b15dad JHS |
549 | |
550 | return err; | |
1da177e4 | 551 | } |
53bc6b4d | 552 | EXPORT_SYMBOL(__xfrm_state_delete); |
1da177e4 | 553 | |
26b15dad | 554 | int xfrm_state_delete(struct xfrm_state *x) |
1da177e4 | 555 | { |
26b15dad JHS |
556 | int err; |
557 | ||
1da177e4 | 558 | spin_lock_bh(&x->lock); |
26b15dad | 559 | err = __xfrm_state_delete(x); |
1da177e4 | 560 | spin_unlock_bh(&x->lock); |
26b15dad JHS |
561 | |
562 | return err; | |
1da177e4 LT |
563 | } |
564 | EXPORT_SYMBOL(xfrm_state_delete); | |
565 | ||
4aa2e62c JL |
566 | #ifdef CONFIG_SECURITY_NETWORK_XFRM |
567 | static inline int | |
0e602451 | 568 | xfrm_state_flush_secctx_check(struct net *net, u8 proto, struct xfrm_audit *audit_info) |
1da177e4 | 569 | { |
4aa2e62c JL |
570 | int i, err = 0; |
571 | ||
0e602451 | 572 | for (i = 0; i <= net->xfrm.state_hmask; i++) { |
4aa2e62c JL |
573 | struct hlist_node *entry; |
574 | struct xfrm_state *x; | |
575 | ||
0e602451 | 576 | hlist_for_each_entry(x, entry, net->xfrm.state_bydst+i, bydst) { |
4aa2e62c JL |
577 | if (xfrm_id_proto_match(x->id.proto, proto) && |
578 | (err = security_xfrm_state_delete(x)) != 0) { | |
ab5f5e8b JL |
579 | xfrm_audit_state_delete(x, 0, |
580 | audit_info->loginuid, | |
2532386f | 581 | audit_info->sessionid, |
ab5f5e8b | 582 | audit_info->secid); |
4aa2e62c JL |
583 | return err; |
584 | } | |
585 | } | |
586 | } | |
587 | ||
588 | return err; | |
589 | } | |
590 | #else | |
591 | static inline int | |
0e602451 | 592 | xfrm_state_flush_secctx_check(struct net *net, u8 proto, struct xfrm_audit *audit_info) |
4aa2e62c JL |
593 | { |
594 | return 0; | |
595 | } | |
596 | #endif | |
597 | ||
0e602451 | 598 | int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info) |
4aa2e62c JL |
599 | { |
600 | int i, err = 0; | |
1da177e4 LT |
601 | |
602 | spin_lock_bh(&xfrm_state_lock); | |
0e602451 | 603 | err = xfrm_state_flush_secctx_check(net, proto, audit_info); |
4aa2e62c JL |
604 | if (err) |
605 | goto out; | |
606 | ||
0e602451 | 607 | for (i = 0; i <= net->xfrm.state_hmask; i++) { |
8f126e37 DM |
608 | struct hlist_node *entry; |
609 | struct xfrm_state *x; | |
1da177e4 | 610 | restart: |
0e602451 | 611 | hlist_for_each_entry(x, entry, net->xfrm.state_bydst+i, bydst) { |
1da177e4 | 612 | if (!xfrm_state_kern(x) && |
5794708f | 613 | xfrm_id_proto_match(x->id.proto, proto)) { |
1da177e4 LT |
614 | xfrm_state_hold(x); |
615 | spin_unlock_bh(&xfrm_state_lock); | |
616 | ||
161a09e7 | 617 | err = xfrm_state_delete(x); |
ab5f5e8b JL |
618 | xfrm_audit_state_delete(x, err ? 0 : 1, |
619 | audit_info->loginuid, | |
2532386f | 620 | audit_info->sessionid, |
ab5f5e8b | 621 | audit_info->secid); |
1da177e4 LT |
622 | xfrm_state_put(x); |
623 | ||
624 | spin_lock_bh(&xfrm_state_lock); | |
625 | goto restart; | |
626 | } | |
627 | } | |
628 | } | |
4aa2e62c JL |
629 | err = 0; |
630 | ||
631 | out: | |
1da177e4 | 632 | spin_unlock_bh(&xfrm_state_lock); |
0e602451 | 633 | wake_up(&net->xfrm.km_waitq); |
4aa2e62c | 634 | return err; |
1da177e4 LT |
635 | } |
636 | EXPORT_SYMBOL(xfrm_state_flush); | |
637 | ||
af11e316 | 638 | void xfrm_sad_getinfo(struct xfrmk_sadinfo *si) |
28d8909b JHS |
639 | { |
640 | spin_lock_bh(&xfrm_state_lock); | |
0bf7c5b0 | 641 | si->sadcnt = init_net.xfrm.state_num; |
529983ec | 642 | si->sadhcnt = init_net.xfrm.state_hmask; |
28d8909b JHS |
643 | si->sadhmcnt = xfrm_state_hashmax; |
644 | spin_unlock_bh(&xfrm_state_lock); | |
645 | } | |
646 | EXPORT_SYMBOL(xfrm_sad_getinfo); | |
647 | ||
1da177e4 LT |
648 | static int |
649 | xfrm_init_tempsel(struct xfrm_state *x, struct flowi *fl, | |
650 | struct xfrm_tmpl *tmpl, | |
651 | xfrm_address_t *daddr, xfrm_address_t *saddr, | |
652 | unsigned short family) | |
653 | { | |
654 | struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); | |
655 | if (!afinfo) | |
656 | return -1; | |
657 | afinfo->init_tempsel(x, fl, tmpl, daddr, saddr); | |
658 | xfrm_state_put_afinfo(afinfo); | |
659 | return 0; | |
660 | } | |
661 | ||
221df1ed | 662 | static struct xfrm_state *__xfrm_state_lookup(struct net *net, xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family) |
edcd5821 | 663 | { |
221df1ed | 664 | unsigned int h = xfrm_spi_hash(net, daddr, spi, proto, family); |
edcd5821 | 665 | struct xfrm_state *x; |
8f126e37 | 666 | struct hlist_node *entry; |
edcd5821 | 667 | |
221df1ed | 668 | hlist_for_each_entry(x, entry, net->xfrm.state_byspi+h, byspi) { |
edcd5821 DM |
669 | if (x->props.family != family || |
670 | x->id.spi != spi || | |
671 | x->id.proto != proto) | |
672 | continue; | |
673 | ||
674 | switch (family) { | |
675 | case AF_INET: | |
676 | if (x->id.daddr.a4 != daddr->a4) | |
677 | continue; | |
678 | break; | |
679 | case AF_INET6: | |
680 | if (!ipv6_addr_equal((struct in6_addr *)daddr, | |
681 | (struct in6_addr *) | |
682 | x->id.daddr.a6)) | |
683 | continue; | |
684 | break; | |
3ff50b79 | 685 | } |
edcd5821 DM |
686 | |
687 | xfrm_state_hold(x); | |
688 | return x; | |
689 | } | |
690 | ||
691 | return NULL; | |
692 | } | |
693 | ||
221df1ed | 694 | static struct xfrm_state *__xfrm_state_lookup_byaddr(struct net *net, xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family) |
edcd5821 | 695 | { |
221df1ed | 696 | unsigned int h = xfrm_src_hash(net, daddr, saddr, family); |
edcd5821 | 697 | struct xfrm_state *x; |
8f126e37 | 698 | struct hlist_node *entry; |
edcd5821 | 699 | |
221df1ed | 700 | hlist_for_each_entry(x, entry, net->xfrm.state_bysrc+h, bysrc) { |
edcd5821 DM |
701 | if (x->props.family != family || |
702 | x->id.proto != proto) | |
703 | continue; | |
704 | ||
705 | switch (family) { | |
706 | case AF_INET: | |
707 | if (x->id.daddr.a4 != daddr->a4 || | |
708 | x->props.saddr.a4 != saddr->a4) | |
709 | continue; | |
710 | break; | |
711 | case AF_INET6: | |
712 | if (!ipv6_addr_equal((struct in6_addr *)daddr, | |
713 | (struct in6_addr *) | |
714 | x->id.daddr.a6) || | |
715 | !ipv6_addr_equal((struct in6_addr *)saddr, | |
716 | (struct in6_addr *) | |
717 | x->props.saddr.a6)) | |
718 | continue; | |
719 | break; | |
3ff50b79 | 720 | } |
edcd5821 DM |
721 | |
722 | xfrm_state_hold(x); | |
723 | return x; | |
724 | } | |
725 | ||
726 | return NULL; | |
727 | } | |
728 | ||
729 | static inline struct xfrm_state * | |
730 | __xfrm_state_locate(struct xfrm_state *x, int use_spi, int family) | |
731 | { | |
221df1ed AD |
732 | struct net *net = xs_net(x); |
733 | ||
edcd5821 | 734 | if (use_spi) |
221df1ed | 735 | return __xfrm_state_lookup(net, &x->id.daddr, x->id.spi, |
edcd5821 DM |
736 | x->id.proto, family); |
737 | else | |
221df1ed | 738 | return __xfrm_state_lookup_byaddr(net, &x->id.daddr, |
edcd5821 DM |
739 | &x->props.saddr, |
740 | x->id.proto, family); | |
741 | } | |
742 | ||
98806f75 | 743 | static void xfrm_hash_grow_check(struct net *net, int have_hash_collision) |
2fab22f2 PM |
744 | { |
745 | if (have_hash_collision && | |
98806f75 AD |
746 | (net->xfrm.state_hmask + 1) < xfrm_state_hashmax && |
747 | net->xfrm.state_num > net->xfrm.state_hmask) | |
748 | schedule_work(&net->xfrm.state_hash_work); | |
2fab22f2 PM |
749 | } |
750 | ||
08ec9af1 DM |
751 | static void xfrm_state_look_at(struct xfrm_policy *pol, struct xfrm_state *x, |
752 | struct flowi *fl, unsigned short family, | |
753 | xfrm_address_t *daddr, xfrm_address_t *saddr, | |
754 | struct xfrm_state **best, int *acq_in_progress, | |
755 | int *error) | |
756 | { | |
757 | /* Resolution logic: | |
758 | * 1. There is a valid state with matching selector. Done. | |
759 | * 2. Valid state with inappropriate selector. Skip. | |
760 | * | |
761 | * Entering area of "sysdeps". | |
762 | * | |
763 | * 3. If state is not valid, selector is temporary, it selects | |
764 | * only session which triggered previous resolution. Key | |
765 | * manager will do something to install a state with proper | |
766 | * selector. | |
767 | */ | |
768 | if (x->km.state == XFRM_STATE_VALID) { | |
769 | if ((x->sel.family && | |
770 | !xfrm_selector_match(&x->sel, fl, x->sel.family)) || | |
771 | !security_xfrm_state_pol_flow_match(x, pol, fl)) | |
772 | return; | |
773 | ||
774 | if (!*best || | |
775 | (*best)->km.dying > x->km.dying || | |
776 | ((*best)->km.dying == x->km.dying && | |
777 | (*best)->curlft.add_time < x->curlft.add_time)) | |
778 | *best = x; | |
779 | } else if (x->km.state == XFRM_STATE_ACQ) { | |
780 | *acq_in_progress = 1; | |
781 | } else if (x->km.state == XFRM_STATE_ERROR || | |
782 | x->km.state == XFRM_STATE_EXPIRED) { | |
783 | if (xfrm_selector_match(&x->sel, fl, x->sel.family) && | |
784 | security_xfrm_state_pol_flow_match(x, pol, fl)) | |
785 | *error = -ESRCH; | |
786 | } | |
787 | } | |
788 | ||
1da177e4 | 789 | struct xfrm_state * |
a716c119 | 790 | xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr, |
1da177e4 LT |
791 | struct flowi *fl, struct xfrm_tmpl *tmpl, |
792 | struct xfrm_policy *pol, int *err, | |
793 | unsigned short family) | |
794 | { | |
08ec9af1 | 795 | static xfrm_address_t saddr_wildcard = { }; |
5447c5e4 | 796 | struct net *net = xp_net(pol); |
6a783c90 | 797 | unsigned int h, h_wildcard; |
8f126e37 | 798 | struct hlist_node *entry; |
37b08e34 | 799 | struct xfrm_state *x, *x0, *to_put; |
1da177e4 LT |
800 | int acquire_in_progress = 0; |
801 | int error = 0; | |
802 | struct xfrm_state *best = NULL; | |
a716c119 | 803 | |
37b08e34 DM |
804 | to_put = NULL; |
805 | ||
1da177e4 | 806 | spin_lock_bh(&xfrm_state_lock); |
5447c5e4 AD |
807 | h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, family); |
808 | hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) { | |
1da177e4 LT |
809 | if (x->props.family == family && |
810 | x->props.reqid == tmpl->reqid && | |
fbd9a5b4 | 811 | !(x->props.flags & XFRM_STATE_WILDRECV) && |
1da177e4 LT |
812 | xfrm_state_addr_check(x, daddr, saddr, family) && |
813 | tmpl->mode == x->props.mode && | |
814 | tmpl->id.proto == x->id.proto && | |
08ec9af1 DM |
815 | (tmpl->id.spi == x->id.spi || !tmpl->id.spi)) |
816 | xfrm_state_look_at(pol, x, fl, family, daddr, saddr, | |
817 | &best, &acquire_in_progress, &error); | |
818 | } | |
819 | if (best) | |
820 | goto found; | |
821 | ||
6a783c90 ND |
822 | h_wildcard = xfrm_dst_hash(net, daddr, &saddr_wildcard, tmpl->reqid, family); |
823 | hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h_wildcard, bydst) { | |
08ec9af1 DM |
824 | if (x->props.family == family && |
825 | x->props.reqid == tmpl->reqid && | |
826 | !(x->props.flags & XFRM_STATE_WILDRECV) && | |
827 | xfrm_state_addr_check(x, daddr, saddr, family) && | |
828 | tmpl->mode == x->props.mode && | |
829 | tmpl->id.proto == x->id.proto && | |
830 | (tmpl->id.spi == x->id.spi || !tmpl->id.spi)) | |
831 | xfrm_state_look_at(pol, x, fl, family, daddr, saddr, | |
832 | &best, &acquire_in_progress, &error); | |
1da177e4 LT |
833 | } |
834 | ||
08ec9af1 | 835 | found: |
1da177e4 LT |
836 | x = best; |
837 | if (!x && !error && !acquire_in_progress) { | |
5c5d281a | 838 | if (tmpl->id.spi && |
5447c5e4 | 839 | (x0 = __xfrm_state_lookup(net, daddr, tmpl->id.spi, |
edcd5821 | 840 | tmpl->id.proto, family)) != NULL) { |
37b08e34 | 841 | to_put = x0; |
1da177e4 LT |
842 | error = -EEXIST; |
843 | goto out; | |
844 | } | |
5447c5e4 | 845 | x = xfrm_state_alloc(net); |
1da177e4 LT |
846 | if (x == NULL) { |
847 | error = -ENOMEM; | |
848 | goto out; | |
849 | } | |
850 | /* Initialize temporary selector matching only | |
851 | * to current session. */ | |
852 | xfrm_init_tempsel(x, fl, tmpl, daddr, saddr, family); | |
853 | ||
e0d1caa7 VY |
854 | error = security_xfrm_state_alloc_acquire(x, pol->security, fl->secid); |
855 | if (error) { | |
856 | x->km.state = XFRM_STATE_DEAD; | |
37b08e34 | 857 | to_put = x; |
e0d1caa7 VY |
858 | x = NULL; |
859 | goto out; | |
860 | } | |
861 | ||
1da177e4 LT |
862 | if (km_query(x, tmpl, pol) == 0) { |
863 | x->km.state = XFRM_STATE_ACQ; | |
5447c5e4 AD |
864 | list_add(&x->km.all, &net->xfrm.state_all); |
865 | hlist_add_head(&x->bydst, net->xfrm.state_bydst+h); | |
866 | h = xfrm_src_hash(net, daddr, saddr, family); | |
867 | hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h); | |
1da177e4 | 868 | if (x->id.spi) { |
5447c5e4 AD |
869 | h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, family); |
870 | hlist_add_head(&x->byspi, net->xfrm.state_byspi+h); | |
1da177e4 | 871 | } |
b27aeadb AD |
872 | x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires; |
873 | x->timer.expires = jiffies + net->xfrm.sysctl_acq_expires*HZ; | |
1da177e4 | 874 | add_timer(&x->timer); |
5447c5e4 AD |
875 | net->xfrm.state_num++; |
876 | xfrm_hash_grow_check(net, x->bydst.next != NULL); | |
1da177e4 LT |
877 | } else { |
878 | x->km.state = XFRM_STATE_DEAD; | |
37b08e34 | 879 | to_put = x; |
1da177e4 LT |
880 | x = NULL; |
881 | error = -ESRCH; | |
882 | } | |
883 | } | |
884 | out: | |
885 | if (x) | |
886 | xfrm_state_hold(x); | |
887 | else | |
888 | *err = acquire_in_progress ? -EAGAIN : error; | |
889 | spin_unlock_bh(&xfrm_state_lock); | |
37b08e34 DM |
890 | if (to_put) |
891 | xfrm_state_put(to_put); | |
1da177e4 LT |
892 | return x; |
893 | } | |
894 | ||
628529b6 | 895 | struct xfrm_state * |
5447c5e4 AD |
896 | xfrm_stateonly_find(struct net *net, |
897 | xfrm_address_t *daddr, xfrm_address_t *saddr, | |
628529b6 JHS |
898 | unsigned short family, u8 mode, u8 proto, u32 reqid) |
899 | { | |
4bda4f25 | 900 | unsigned int h; |
628529b6 JHS |
901 | struct xfrm_state *rx = NULL, *x = NULL; |
902 | struct hlist_node *entry; | |
903 | ||
904 | spin_lock(&xfrm_state_lock); | |
5447c5e4 AD |
905 | h = xfrm_dst_hash(net, daddr, saddr, reqid, family); |
906 | hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) { | |
628529b6 JHS |
907 | if (x->props.family == family && |
908 | x->props.reqid == reqid && | |
909 | !(x->props.flags & XFRM_STATE_WILDRECV) && | |
910 | xfrm_state_addr_check(x, daddr, saddr, family) && | |
911 | mode == x->props.mode && | |
912 | proto == x->id.proto && | |
913 | x->km.state == XFRM_STATE_VALID) { | |
914 | rx = x; | |
915 | break; | |
916 | } | |
917 | } | |
918 | ||
919 | if (rx) | |
920 | xfrm_state_hold(rx); | |
921 | spin_unlock(&xfrm_state_lock); | |
922 | ||
923 | ||
924 | return rx; | |
925 | } | |
926 | EXPORT_SYMBOL(xfrm_stateonly_find); | |
927 | ||
1da177e4 LT |
928 | static void __xfrm_state_insert(struct xfrm_state *x) |
929 | { | |
98806f75 | 930 | struct net *net = xs_net(x); |
a624c108 | 931 | unsigned int h; |
1da177e4 | 932 | |
9d4a706d DM |
933 | x->genid = ++xfrm_state_genid; |
934 | ||
98806f75 | 935 | list_add(&x->km.all, &net->xfrm.state_all); |
4c563f76 | 936 | |
98806f75 | 937 | h = xfrm_dst_hash(net, &x->id.daddr, &x->props.saddr, |
c1969f29 | 938 | x->props.reqid, x->props.family); |
98806f75 | 939 | hlist_add_head(&x->bydst, net->xfrm.state_bydst+h); |
1da177e4 | 940 | |
98806f75 AD |
941 | h = xfrm_src_hash(net, &x->id.daddr, &x->props.saddr, x->props.family); |
942 | hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h); | |
1da177e4 | 943 | |
7b4dc360 | 944 | if (x->id.spi) { |
98806f75 | 945 | h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, |
6c44e6b7 MN |
946 | x->props.family); |
947 | ||
98806f75 | 948 | hlist_add_head(&x->byspi, net->xfrm.state_byspi+h); |
6c44e6b7 MN |
949 | } |
950 | ||
a47f0ce0 DM |
951 | mod_timer(&x->timer, jiffies + HZ); |
952 | if (x->replay_maxage) | |
953 | mod_timer(&x->rtimer, jiffies + x->replay_maxage); | |
f8cd5488 | 954 | |
98806f75 | 955 | wake_up(&net->xfrm.km_waitq); |
f034b5d4 | 956 | |
98806f75 | 957 | net->xfrm.state_num++; |
f034b5d4 | 958 | |
98806f75 | 959 | xfrm_hash_grow_check(net, x->bydst.next != NULL); |
1da177e4 LT |
960 | } |
961 | ||
c7f5ea3a DM |
962 | /* xfrm_state_lock is held */ |
963 | static void __xfrm_state_bump_genids(struct xfrm_state *xnew) | |
964 | { | |
98806f75 | 965 | struct net *net = xs_net(xnew); |
c7f5ea3a DM |
966 | unsigned short family = xnew->props.family; |
967 | u32 reqid = xnew->props.reqid; | |
968 | struct xfrm_state *x; | |
969 | struct hlist_node *entry; | |
970 | unsigned int h; | |
971 | ||
98806f75 AD |
972 | h = xfrm_dst_hash(net, &xnew->id.daddr, &xnew->props.saddr, reqid, family); |
973 | hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) { | |
c7f5ea3a DM |
974 | if (x->props.family == family && |
975 | x->props.reqid == reqid && | |
c1969f29 DM |
976 | !xfrm_addr_cmp(&x->id.daddr, &xnew->id.daddr, family) && |
977 | !xfrm_addr_cmp(&x->props.saddr, &xnew->props.saddr, family)) | |
c7f5ea3a DM |
978 | x->genid = xfrm_state_genid; |
979 | } | |
980 | } | |
981 | ||
1da177e4 LT |
982 | void xfrm_state_insert(struct xfrm_state *x) |
983 | { | |
984 | spin_lock_bh(&xfrm_state_lock); | |
c7f5ea3a | 985 | __xfrm_state_bump_genids(x); |
1da177e4 LT |
986 | __xfrm_state_insert(x); |
987 | spin_unlock_bh(&xfrm_state_lock); | |
988 | } | |
989 | EXPORT_SYMBOL(xfrm_state_insert); | |
990 | ||
2770834c | 991 | /* xfrm_state_lock is held */ |
5447c5e4 | 992 | static struct xfrm_state *__find_acq_core(struct net *net, unsigned short family, u8 mode, u32 reqid, u8 proto, xfrm_address_t *daddr, xfrm_address_t *saddr, int create) |
2770834c | 993 | { |
5447c5e4 | 994 | unsigned int h = xfrm_dst_hash(net, daddr, saddr, reqid, family); |
8f126e37 | 995 | struct hlist_node *entry; |
2770834c DM |
996 | struct xfrm_state *x; |
997 | ||
5447c5e4 | 998 | hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) { |
2770834c DM |
999 | if (x->props.reqid != reqid || |
1000 | x->props.mode != mode || | |
1001 | x->props.family != family || | |
1002 | x->km.state != XFRM_STATE_ACQ || | |
75e252d9 JL |
1003 | x->id.spi != 0 || |
1004 | x->id.proto != proto) | |
2770834c DM |
1005 | continue; |
1006 | ||
1007 | switch (family) { | |
1008 | case AF_INET: | |
1009 | if (x->id.daddr.a4 != daddr->a4 || | |
1010 | x->props.saddr.a4 != saddr->a4) | |
1011 | continue; | |
1012 | break; | |
1013 | case AF_INET6: | |
1014 | if (!ipv6_addr_equal((struct in6_addr *)x->id.daddr.a6, | |
1015 | (struct in6_addr *)daddr) || | |
1016 | !ipv6_addr_equal((struct in6_addr *) | |
1017 | x->props.saddr.a6, | |
1018 | (struct in6_addr *)saddr)) | |
1019 | continue; | |
1020 | break; | |
3ff50b79 | 1021 | } |
2770834c DM |
1022 | |
1023 | xfrm_state_hold(x); | |
1024 | return x; | |
1025 | } | |
1026 | ||
1027 | if (!create) | |
1028 | return NULL; | |
1029 | ||
5447c5e4 | 1030 | x = xfrm_state_alloc(net); |
2770834c DM |
1031 | if (likely(x)) { |
1032 | switch (family) { | |
1033 | case AF_INET: | |
1034 | x->sel.daddr.a4 = daddr->a4; | |
1035 | x->sel.saddr.a4 = saddr->a4; | |
1036 | x->sel.prefixlen_d = 32; | |
1037 | x->sel.prefixlen_s = 32; | |
1038 | x->props.saddr.a4 = saddr->a4; | |
1039 | x->id.daddr.a4 = daddr->a4; | |
1040 | break; | |
1041 | ||
1042 | case AF_INET6: | |
1043 | ipv6_addr_copy((struct in6_addr *)x->sel.daddr.a6, | |
1044 | (struct in6_addr *)daddr); | |
1045 | ipv6_addr_copy((struct in6_addr *)x->sel.saddr.a6, | |
1046 | (struct in6_addr *)saddr); | |
1047 | x->sel.prefixlen_d = 128; | |
1048 | x->sel.prefixlen_s = 128; | |
1049 | ipv6_addr_copy((struct in6_addr *)x->props.saddr.a6, | |
1050 | (struct in6_addr *)saddr); | |
1051 | ipv6_addr_copy((struct in6_addr *)x->id.daddr.a6, | |
1052 | (struct in6_addr *)daddr); | |
1053 | break; | |
3ff50b79 | 1054 | } |
2770834c DM |
1055 | |
1056 | x->km.state = XFRM_STATE_ACQ; | |
1057 | x->id.proto = proto; | |
1058 | x->props.family = family; | |
1059 | x->props.mode = mode; | |
1060 | x->props.reqid = reqid; | |
b27aeadb | 1061 | x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires; |
2770834c | 1062 | xfrm_state_hold(x); |
b27aeadb | 1063 | x->timer.expires = jiffies + net->xfrm.sysctl_acq_expires*HZ; |
2770834c | 1064 | add_timer(&x->timer); |
5447c5e4 AD |
1065 | list_add(&x->km.all, &net->xfrm.state_all); |
1066 | hlist_add_head(&x->bydst, net->xfrm.state_bydst+h); | |
1067 | h = xfrm_src_hash(net, daddr, saddr, family); | |
1068 | hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h); | |
918049f0 | 1069 | |
5447c5e4 | 1070 | net->xfrm.state_num++; |
918049f0 | 1071 | |
5447c5e4 | 1072 | xfrm_hash_grow_check(net, x->bydst.next != NULL); |
2770834c DM |
1073 | } |
1074 | ||
1075 | return x; | |
1076 | } | |
1077 | ||
5447c5e4 | 1078 | static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 seq); |
1da177e4 LT |
1079 | |
1080 | int xfrm_state_add(struct xfrm_state *x) | |
1081 | { | |
5447c5e4 | 1082 | struct net *net = xs_net(x); |
37b08e34 | 1083 | struct xfrm_state *x1, *to_put; |
1da177e4 LT |
1084 | int family; |
1085 | int err; | |
eb2971b6 | 1086 | int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY); |
1da177e4 LT |
1087 | |
1088 | family = x->props.family; | |
1da177e4 | 1089 | |
37b08e34 DM |
1090 | to_put = NULL; |
1091 | ||
1da177e4 LT |
1092 | spin_lock_bh(&xfrm_state_lock); |
1093 | ||
edcd5821 | 1094 | x1 = __xfrm_state_locate(x, use_spi, family); |
1da177e4 | 1095 | if (x1) { |
37b08e34 | 1096 | to_put = x1; |
1da177e4 LT |
1097 | x1 = NULL; |
1098 | err = -EEXIST; | |
1099 | goto out; | |
1100 | } | |
1101 | ||
eb2971b6 | 1102 | if (use_spi && x->km.seq) { |
5447c5e4 | 1103 | x1 = __xfrm_find_acq_byseq(net, x->km.seq); |
75e252d9 JL |
1104 | if (x1 && ((x1->id.proto != x->id.proto) || |
1105 | xfrm_addr_cmp(&x1->id.daddr, &x->id.daddr, family))) { | |
37b08e34 | 1106 | to_put = x1; |
1da177e4 LT |
1107 | x1 = NULL; |
1108 | } | |
1109 | } | |
1110 | ||
eb2971b6 | 1111 | if (use_spi && !x1) |
5447c5e4 | 1112 | x1 = __find_acq_core(net, family, x->props.mode, x->props.reqid, |
2770834c DM |
1113 | x->id.proto, |
1114 | &x->id.daddr, &x->props.saddr, 0); | |
1da177e4 | 1115 | |
c7f5ea3a | 1116 | __xfrm_state_bump_genids(x); |
1da177e4 LT |
1117 | __xfrm_state_insert(x); |
1118 | err = 0; | |
1119 | ||
1120 | out: | |
1121 | spin_unlock_bh(&xfrm_state_lock); | |
1da177e4 LT |
1122 | |
1123 | if (x1) { | |
1124 | xfrm_state_delete(x1); | |
1125 | xfrm_state_put(x1); | |
1126 | } | |
1127 | ||
37b08e34 DM |
1128 | if (to_put) |
1129 | xfrm_state_put(to_put); | |
1130 | ||
1da177e4 LT |
1131 | return err; |
1132 | } | |
1133 | EXPORT_SYMBOL(xfrm_state_add); | |
1134 | ||
80c9abaa | 1135 | #ifdef CONFIG_XFRM_MIGRATE |
6666351d | 1136 | static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig, int *errp) |
80c9abaa | 1137 | { |
98806f75 | 1138 | struct net *net = xs_net(orig); |
80c9abaa | 1139 | int err = -ENOMEM; |
98806f75 | 1140 | struct xfrm_state *x = xfrm_state_alloc(net); |
80c9abaa SS |
1141 | if (!x) |
1142 | goto error; | |
1143 | ||
1144 | memcpy(&x->id, &orig->id, sizeof(x->id)); | |
1145 | memcpy(&x->sel, &orig->sel, sizeof(x->sel)); | |
1146 | memcpy(&x->lft, &orig->lft, sizeof(x->lft)); | |
1147 | x->props.mode = orig->props.mode; | |
1148 | x->props.replay_window = orig->props.replay_window; | |
1149 | x->props.reqid = orig->props.reqid; | |
1150 | x->props.family = orig->props.family; | |
1151 | x->props.saddr = orig->props.saddr; | |
1152 | ||
1153 | if (orig->aalg) { | |
1154 | x->aalg = xfrm_algo_clone(orig->aalg); | |
1155 | if (!x->aalg) | |
1156 | goto error; | |
1157 | } | |
1158 | x->props.aalgo = orig->props.aalgo; | |
1159 | ||
1160 | if (orig->ealg) { | |
1161 | x->ealg = xfrm_algo_clone(orig->ealg); | |
1162 | if (!x->ealg) | |
1163 | goto error; | |
1164 | } | |
1165 | x->props.ealgo = orig->props.ealgo; | |
1166 | ||
1167 | if (orig->calg) { | |
1168 | x->calg = xfrm_algo_clone(orig->calg); | |
1169 | if (!x->calg) | |
1170 | goto error; | |
1171 | } | |
1172 | x->props.calgo = orig->props.calgo; | |
1173 | ||
a716c119 | 1174 | if (orig->encap) { |
80c9abaa SS |
1175 | x->encap = kmemdup(orig->encap, sizeof(*x->encap), GFP_KERNEL); |
1176 | if (!x->encap) | |
1177 | goto error; | |
1178 | } | |
1179 | ||
1180 | if (orig->coaddr) { | |
1181 | x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr), | |
1182 | GFP_KERNEL); | |
1183 | if (!x->coaddr) | |
1184 | goto error; | |
1185 | } | |
1186 | ||
1187 | err = xfrm_init_state(x); | |
1188 | if (err) | |
1189 | goto error; | |
1190 | ||
1191 | x->props.flags = orig->props.flags; | |
1192 | ||
1193 | x->curlft.add_time = orig->curlft.add_time; | |
1194 | x->km.state = orig->km.state; | |
1195 | x->km.seq = orig->km.seq; | |
1196 | ||
1197 | return x; | |
1198 | ||
1199 | error: | |
1200 | if (errp) | |
1201 | *errp = err; | |
1202 | if (x) { | |
1203 | kfree(x->aalg); | |
1204 | kfree(x->ealg); | |
1205 | kfree(x->calg); | |
1206 | kfree(x->encap); | |
1207 | kfree(x->coaddr); | |
1208 | } | |
1209 | kfree(x); | |
1210 | return NULL; | |
1211 | } | |
80c9abaa SS |
1212 | |
1213 | /* xfrm_state_lock is held */ | |
1214 | struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m) | |
1215 | { | |
1216 | unsigned int h; | |
1217 | struct xfrm_state *x; | |
1218 | struct hlist_node *entry; | |
1219 | ||
1220 | if (m->reqid) { | |
64d0cd00 | 1221 | h = xfrm_dst_hash(&init_net, &m->old_daddr, &m->old_saddr, |
80c9abaa | 1222 | m->reqid, m->old_family); |
73d189dc | 1223 | hlist_for_each_entry(x, entry, init_net.xfrm.state_bydst+h, bydst) { |
80c9abaa SS |
1224 | if (x->props.mode != m->mode || |
1225 | x->id.proto != m->proto) | |
1226 | continue; | |
1227 | if (m->reqid && x->props.reqid != m->reqid) | |
1228 | continue; | |
1229 | if (xfrm_addr_cmp(&x->id.daddr, &m->old_daddr, | |
1230 | m->old_family) || | |
1231 | xfrm_addr_cmp(&x->props.saddr, &m->old_saddr, | |
1232 | m->old_family)) | |
1233 | continue; | |
1234 | xfrm_state_hold(x); | |
1235 | return x; | |
1236 | } | |
1237 | } else { | |
64d0cd00 | 1238 | h = xfrm_src_hash(&init_net, &m->old_daddr, &m->old_saddr, |
80c9abaa | 1239 | m->old_family); |
d320bbb3 | 1240 | hlist_for_each_entry(x, entry, init_net.xfrm.state_bysrc+h, bysrc) { |
80c9abaa SS |
1241 | if (x->props.mode != m->mode || |
1242 | x->id.proto != m->proto) | |
1243 | continue; | |
1244 | if (xfrm_addr_cmp(&x->id.daddr, &m->old_daddr, | |
1245 | m->old_family) || | |
1246 | xfrm_addr_cmp(&x->props.saddr, &m->old_saddr, | |
1247 | m->old_family)) | |
1248 | continue; | |
1249 | xfrm_state_hold(x); | |
1250 | return x; | |
1251 | } | |
1252 | } | |
1253 | ||
a716c119 | 1254 | return NULL; |
80c9abaa SS |
1255 | } |
1256 | EXPORT_SYMBOL(xfrm_migrate_state_find); | |
1257 | ||
1258 | struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x, | |
1259 | struct xfrm_migrate *m) | |
1260 | { | |
1261 | struct xfrm_state *xc; | |
1262 | int err; | |
1263 | ||
1264 | xc = xfrm_state_clone(x, &err); | |
1265 | if (!xc) | |
1266 | return NULL; | |
1267 | ||
1268 | memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr)); | |
1269 | memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr)); | |
1270 | ||
1271 | /* add state */ | |
1272 | if (!xfrm_addr_cmp(&x->id.daddr, &m->new_daddr, m->new_family)) { | |
1273 | /* a care is needed when the destination address of the | |
1274 | state is to be updated as it is a part of triplet */ | |
1275 | xfrm_state_insert(xc); | |
1276 | } else { | |
1277 | if ((err = xfrm_state_add(xc)) < 0) | |
1278 | goto error; | |
1279 | } | |
1280 | ||
1281 | return xc; | |
1282 | error: | |
1283 | kfree(xc); | |
1284 | return NULL; | |
1285 | } | |
1286 | EXPORT_SYMBOL(xfrm_state_migrate); | |
1287 | #endif | |
1288 | ||
1da177e4 LT |
1289 | int xfrm_state_update(struct xfrm_state *x) |
1290 | { | |
37b08e34 | 1291 | struct xfrm_state *x1, *to_put; |
1da177e4 | 1292 | int err; |
eb2971b6 | 1293 | int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY); |
1da177e4 | 1294 | |
37b08e34 DM |
1295 | to_put = NULL; |
1296 | ||
1da177e4 | 1297 | spin_lock_bh(&xfrm_state_lock); |
edcd5821 | 1298 | x1 = __xfrm_state_locate(x, use_spi, x->props.family); |
1da177e4 LT |
1299 | |
1300 | err = -ESRCH; | |
1301 | if (!x1) | |
1302 | goto out; | |
1303 | ||
1304 | if (xfrm_state_kern(x1)) { | |
37b08e34 | 1305 | to_put = x1; |
1da177e4 LT |
1306 | err = -EEXIST; |
1307 | goto out; | |
1308 | } | |
1309 | ||
1310 | if (x1->km.state == XFRM_STATE_ACQ) { | |
1311 | __xfrm_state_insert(x); | |
1312 | x = NULL; | |
1313 | } | |
1314 | err = 0; | |
1315 | ||
1316 | out: | |
1317 | spin_unlock_bh(&xfrm_state_lock); | |
1da177e4 | 1318 | |
37b08e34 DM |
1319 | if (to_put) |
1320 | xfrm_state_put(to_put); | |
1321 | ||
1da177e4 LT |
1322 | if (err) |
1323 | return err; | |
1324 | ||
1325 | if (!x) { | |
1326 | xfrm_state_delete(x1); | |
1327 | xfrm_state_put(x1); | |
1328 | return 0; | |
1329 | } | |
1330 | ||
1331 | err = -EINVAL; | |
1332 | spin_lock_bh(&x1->lock); | |
1333 | if (likely(x1->km.state == XFRM_STATE_VALID)) { | |
1334 | if (x->encap && x1->encap) | |
1335 | memcpy(x1->encap, x->encap, sizeof(*x1->encap)); | |
060f02a3 NT |
1336 | if (x->coaddr && x1->coaddr) { |
1337 | memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr)); | |
1338 | } | |
1339 | if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel))) | |
1340 | memcpy(&x1->sel, &x->sel, sizeof(x1->sel)); | |
1da177e4 LT |
1341 | memcpy(&x1->lft, &x->lft, sizeof(x1->lft)); |
1342 | x1->km.dying = 0; | |
1343 | ||
a47f0ce0 | 1344 | mod_timer(&x1->timer, jiffies + HZ); |
1da177e4 LT |
1345 | if (x1->curlft.use_time) |
1346 | xfrm_state_check_expire(x1); | |
1347 | ||
1348 | err = 0; | |
1349 | } | |
1350 | spin_unlock_bh(&x1->lock); | |
1351 | ||
1352 | xfrm_state_put(x1); | |
1353 | ||
1354 | return err; | |
1355 | } | |
1356 | EXPORT_SYMBOL(xfrm_state_update); | |
1357 | ||
1358 | int xfrm_state_check_expire(struct xfrm_state *x) | |
1359 | { | |
1360 | if (!x->curlft.use_time) | |
9d729f72 | 1361 | x->curlft.use_time = get_seconds(); |
1da177e4 LT |
1362 | |
1363 | if (x->km.state != XFRM_STATE_VALID) | |
1364 | return -EINVAL; | |
1365 | ||
1366 | if (x->curlft.bytes >= x->lft.hard_byte_limit || | |
1367 | x->curlft.packets >= x->lft.hard_packet_limit) { | |
4666faab | 1368 | x->km.state = XFRM_STATE_EXPIRED; |
a47f0ce0 | 1369 | mod_timer(&x->timer, jiffies); |
1da177e4 LT |
1370 | return -EINVAL; |
1371 | } | |
1372 | ||
1373 | if (!x->km.dying && | |
1374 | (x->curlft.bytes >= x->lft.soft_byte_limit || | |
4666faab HX |
1375 | x->curlft.packets >= x->lft.soft_packet_limit)) { |
1376 | x->km.dying = 1; | |
53bc6b4d | 1377 | km_state_expired(x, 0, 0); |
4666faab | 1378 | } |
1da177e4 LT |
1379 | return 0; |
1380 | } | |
1381 | EXPORT_SYMBOL(xfrm_state_check_expire); | |
1382 | ||
1da177e4 | 1383 | struct xfrm_state * |
221df1ed | 1384 | xfrm_state_lookup(struct net *net, xfrm_address_t *daddr, __be32 spi, u8 proto, |
1da177e4 LT |
1385 | unsigned short family) |
1386 | { | |
1387 | struct xfrm_state *x; | |
1da177e4 LT |
1388 | |
1389 | spin_lock_bh(&xfrm_state_lock); | |
221df1ed | 1390 | x = __xfrm_state_lookup(net, daddr, spi, proto, family); |
1da177e4 | 1391 | spin_unlock_bh(&xfrm_state_lock); |
1da177e4 LT |
1392 | return x; |
1393 | } | |
1394 | EXPORT_SYMBOL(xfrm_state_lookup); | |
1395 | ||
1396 | struct xfrm_state * | |
221df1ed AD |
1397 | xfrm_state_lookup_byaddr(struct net *net, |
1398 | xfrm_address_t *daddr, xfrm_address_t *saddr, | |
eb2971b6 MN |
1399 | u8 proto, unsigned short family) |
1400 | { | |
1401 | struct xfrm_state *x; | |
eb2971b6 MN |
1402 | |
1403 | spin_lock_bh(&xfrm_state_lock); | |
221df1ed | 1404 | x = __xfrm_state_lookup_byaddr(net, daddr, saddr, proto, family); |
eb2971b6 | 1405 | spin_unlock_bh(&xfrm_state_lock); |
eb2971b6 MN |
1406 | return x; |
1407 | } | |
1408 | EXPORT_SYMBOL(xfrm_state_lookup_byaddr); | |
1409 | ||
1410 | struct xfrm_state * | |
5447c5e4 | 1411 | xfrm_find_acq(struct net *net, u8 mode, u32 reqid, u8 proto, |
a716c119 | 1412 | xfrm_address_t *daddr, xfrm_address_t *saddr, |
1da177e4 LT |
1413 | int create, unsigned short family) |
1414 | { | |
1415 | struct xfrm_state *x; | |
1da177e4 LT |
1416 | |
1417 | spin_lock_bh(&xfrm_state_lock); | |
5447c5e4 | 1418 | x = __find_acq_core(net, family, mode, reqid, proto, daddr, saddr, create); |
1da177e4 | 1419 | spin_unlock_bh(&xfrm_state_lock); |
2770834c | 1420 | |
1da177e4 LT |
1421 | return x; |
1422 | } | |
1423 | EXPORT_SYMBOL(xfrm_find_acq); | |
1424 | ||
41a49cc3 MN |
1425 | #ifdef CONFIG_XFRM_SUB_POLICY |
1426 | int | |
1427 | xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n, | |
1428 | unsigned short family) | |
1429 | { | |
1430 | int err = 0; | |
1431 | struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); | |
1432 | if (!afinfo) | |
1433 | return -EAFNOSUPPORT; | |
1434 | ||
1435 | spin_lock_bh(&xfrm_state_lock); | |
1436 | if (afinfo->tmpl_sort) | |
1437 | err = afinfo->tmpl_sort(dst, src, n); | |
1438 | spin_unlock_bh(&xfrm_state_lock); | |
1439 | xfrm_state_put_afinfo(afinfo); | |
1440 | return err; | |
1441 | } | |
1442 | EXPORT_SYMBOL(xfrm_tmpl_sort); | |
1443 | ||
1444 | int | |
1445 | xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n, | |
1446 | unsigned short family) | |
1447 | { | |
1448 | int err = 0; | |
1449 | struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); | |
1450 | if (!afinfo) | |
1451 | return -EAFNOSUPPORT; | |
1452 | ||
1453 | spin_lock_bh(&xfrm_state_lock); | |
1454 | if (afinfo->state_sort) | |
1455 | err = afinfo->state_sort(dst, src, n); | |
1456 | spin_unlock_bh(&xfrm_state_lock); | |
1457 | xfrm_state_put_afinfo(afinfo); | |
1458 | return err; | |
1459 | } | |
1460 | EXPORT_SYMBOL(xfrm_state_sort); | |
1461 | #endif | |
1462 | ||
1da177e4 LT |
1463 | /* Silly enough, but I'm lazy to build resolution list */ |
1464 | ||
5447c5e4 | 1465 | static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 seq) |
1da177e4 LT |
1466 | { |
1467 | int i; | |
1da177e4 | 1468 | |
5447c5e4 | 1469 | for (i = 0; i <= net->xfrm.state_hmask; i++) { |
8f126e37 DM |
1470 | struct hlist_node *entry; |
1471 | struct xfrm_state *x; | |
1472 | ||
5447c5e4 | 1473 | hlist_for_each_entry(x, entry, net->xfrm.state_bydst+i, bydst) { |
8f126e37 DM |
1474 | if (x->km.seq == seq && |
1475 | x->km.state == XFRM_STATE_ACQ) { | |
1da177e4 LT |
1476 | xfrm_state_hold(x); |
1477 | return x; | |
1478 | } | |
1479 | } | |
1480 | } | |
1481 | return NULL; | |
1482 | } | |
1483 | ||
5447c5e4 | 1484 | struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 seq) |
1da177e4 LT |
1485 | { |
1486 | struct xfrm_state *x; | |
1487 | ||
1488 | spin_lock_bh(&xfrm_state_lock); | |
5447c5e4 | 1489 | x = __xfrm_find_acq_byseq(net, seq); |
1da177e4 LT |
1490 | spin_unlock_bh(&xfrm_state_lock); |
1491 | return x; | |
1492 | } | |
1493 | EXPORT_SYMBOL(xfrm_find_acq_byseq); | |
1494 | ||
1495 | u32 xfrm_get_acqseq(void) | |
1496 | { | |
1497 | u32 res; | |
1498 | static u32 acqseq; | |
1499 | static DEFINE_SPINLOCK(acqseq_lock); | |
1500 | ||
1501 | spin_lock_bh(&acqseq_lock); | |
1502 | res = (++acqseq ? : ++acqseq); | |
1503 | spin_unlock_bh(&acqseq_lock); | |
1504 | return res; | |
1505 | } | |
1506 | EXPORT_SYMBOL(xfrm_get_acqseq); | |
1507 | ||
658b219e | 1508 | int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high) |
1da177e4 | 1509 | { |
221df1ed | 1510 | struct net *net = xs_net(x); |
f034b5d4 | 1511 | unsigned int h; |
1da177e4 | 1512 | struct xfrm_state *x0; |
658b219e HX |
1513 | int err = -ENOENT; |
1514 | __be32 minspi = htonl(low); | |
1515 | __be32 maxspi = htonl(high); | |
1da177e4 | 1516 | |
658b219e HX |
1517 | spin_lock_bh(&x->lock); |
1518 | if (x->km.state == XFRM_STATE_DEAD) | |
1519 | goto unlock; | |
1520 | ||
1521 | err = 0; | |
1da177e4 | 1522 | if (x->id.spi) |
658b219e HX |
1523 | goto unlock; |
1524 | ||
1525 | err = -ENOENT; | |
1da177e4 LT |
1526 | |
1527 | if (minspi == maxspi) { | |
221df1ed | 1528 | x0 = xfrm_state_lookup(net, &x->id.daddr, minspi, x->id.proto, x->props.family); |
1da177e4 LT |
1529 | if (x0) { |
1530 | xfrm_state_put(x0); | |
658b219e | 1531 | goto unlock; |
1da177e4 LT |
1532 | } |
1533 | x->id.spi = minspi; | |
1534 | } else { | |
1535 | u32 spi = 0; | |
26977b4e AV |
1536 | for (h=0; h<high-low+1; h++) { |
1537 | spi = low + net_random()%(high-low+1); | |
221df1ed | 1538 | x0 = xfrm_state_lookup(net, &x->id.daddr, htonl(spi), x->id.proto, x->props.family); |
1da177e4 LT |
1539 | if (x0 == NULL) { |
1540 | x->id.spi = htonl(spi); | |
1541 | break; | |
1542 | } | |
1543 | xfrm_state_put(x0); | |
1544 | } | |
1545 | } | |
1546 | if (x->id.spi) { | |
1547 | spin_lock_bh(&xfrm_state_lock); | |
12604d8a AD |
1548 | h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family); |
1549 | hlist_add_head(&x->byspi, net->xfrm.state_byspi+h); | |
1da177e4 | 1550 | spin_unlock_bh(&xfrm_state_lock); |
658b219e HX |
1551 | |
1552 | err = 0; | |
1da177e4 | 1553 | } |
658b219e HX |
1554 | |
1555 | unlock: | |
1556 | spin_unlock_bh(&x->lock); | |
1557 | ||
1558 | return err; | |
1da177e4 LT |
1559 | } |
1560 | EXPORT_SYMBOL(xfrm_alloc_spi); | |
1561 | ||
284fa7da | 1562 | int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk, |
4c563f76 | 1563 | int (*func)(struct xfrm_state *, int, void*), |
1da177e4 LT |
1564 | void *data) |
1565 | { | |
12a169e7 HX |
1566 | struct xfrm_state *state; |
1567 | struct xfrm_state_walk *x; | |
1da177e4 LT |
1568 | int err = 0; |
1569 | ||
12a169e7 | 1570 | if (walk->seq != 0 && list_empty(&walk->all)) |
4c563f76 TT |
1571 | return 0; |
1572 | ||
1da177e4 | 1573 | spin_lock_bh(&xfrm_state_lock); |
12a169e7 | 1574 | if (list_empty(&walk->all)) |
284fa7da | 1575 | x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all); |
12a169e7 HX |
1576 | else |
1577 | x = list_entry(&walk->all, struct xfrm_state_walk, all); | |
284fa7da | 1578 | list_for_each_entry_from(x, &net->xfrm.state_all, all) { |
12a169e7 | 1579 | if (x->state == XFRM_STATE_DEAD) |
4c563f76 | 1580 | continue; |
12a169e7 HX |
1581 | state = container_of(x, struct xfrm_state, km); |
1582 | if (!xfrm_id_proto_match(state->id.proto, walk->proto)) | |
4c563f76 | 1583 | continue; |
12a169e7 HX |
1584 | err = func(state, walk->seq, data); |
1585 | if (err) { | |
1586 | list_move_tail(&walk->all, &x->all); | |
1587 | goto out; | |
1da177e4 | 1588 | } |
12a169e7 | 1589 | walk->seq++; |
1da177e4 | 1590 | } |
12a169e7 | 1591 | if (walk->seq == 0) { |
1da177e4 LT |
1592 | err = -ENOENT; |
1593 | goto out; | |
1594 | } | |
12a169e7 | 1595 | list_del_init(&walk->all); |
1da177e4 LT |
1596 | out: |
1597 | spin_unlock_bh(&xfrm_state_lock); | |
1598 | return err; | |
1599 | } | |
1600 | EXPORT_SYMBOL(xfrm_state_walk); | |
1601 | ||
5c182458 HX |
1602 | void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto) |
1603 | { | |
12a169e7 | 1604 | INIT_LIST_HEAD(&walk->all); |
5c182458 | 1605 | walk->proto = proto; |
12a169e7 HX |
1606 | walk->state = XFRM_STATE_DEAD; |
1607 | walk->seq = 0; | |
5c182458 HX |
1608 | } |
1609 | EXPORT_SYMBOL(xfrm_state_walk_init); | |
1610 | ||
abb81c4f HX |
1611 | void xfrm_state_walk_done(struct xfrm_state_walk *walk) |
1612 | { | |
12a169e7 | 1613 | if (list_empty(&walk->all)) |
5c182458 | 1614 | return; |
5c182458 | 1615 | |
12a169e7 HX |
1616 | spin_lock_bh(&xfrm_state_lock); |
1617 | list_del(&walk->all); | |
7d0b591c | 1618 | spin_unlock_bh(&xfrm_state_lock); |
abb81c4f HX |
1619 | } |
1620 | EXPORT_SYMBOL(xfrm_state_walk_done); | |
1621 | ||
f8cd5488 JHS |
1622 | |
1623 | void xfrm_replay_notify(struct xfrm_state *x, int event) | |
1624 | { | |
1625 | struct km_event c; | |
1626 | /* we send notify messages in case | |
1627 | * 1. we updated on of the sequence numbers, and the seqno difference | |
1628 | * is at least x->replay_maxdiff, in this case we also update the | |
1629 | * timeout of our timer function | |
1630 | * 2. if x->replay_maxage has elapsed since last update, | |
1631 | * and there were changes | |
1632 | * | |
1633 | * The state structure must be locked! | |
1634 | */ | |
1635 | ||
1636 | switch (event) { | |
1637 | case XFRM_REPLAY_UPDATE: | |
1638 | if (x->replay_maxdiff && | |
1639 | (x->replay.seq - x->preplay.seq < x->replay_maxdiff) && | |
2717096a JHS |
1640 | (x->replay.oseq - x->preplay.oseq < x->replay_maxdiff)) { |
1641 | if (x->xflags & XFRM_TIME_DEFER) | |
1642 | event = XFRM_REPLAY_TIMEOUT; | |
1643 | else | |
1644 | return; | |
1645 | } | |
f8cd5488 JHS |
1646 | |
1647 | break; | |
1648 | ||
1649 | case XFRM_REPLAY_TIMEOUT: | |
1650 | if ((x->replay.seq == x->preplay.seq) && | |
1651 | (x->replay.bitmap == x->preplay.bitmap) && | |
2717096a JHS |
1652 | (x->replay.oseq == x->preplay.oseq)) { |
1653 | x->xflags |= XFRM_TIME_DEFER; | |
f8cd5488 | 1654 | return; |
2717096a | 1655 | } |
f8cd5488 JHS |
1656 | |
1657 | break; | |
1658 | } | |
1659 | ||
1660 | memcpy(&x->preplay, &x->replay, sizeof(struct xfrm_replay_state)); | |
1661 | c.event = XFRM_MSG_NEWAE; | |
1662 | c.data.aevent = event; | |
1663 | km_state_notify(x, &c); | |
1664 | ||
f8cd5488 | 1665 | if (x->replay_maxage && |
a47f0ce0 | 1666 | !mod_timer(&x->rtimer, jiffies + x->replay_maxage)) |
2717096a | 1667 | x->xflags &= ~XFRM_TIME_DEFER; |
f8cd5488 JHS |
1668 | } |
1669 | ||
1670 | static void xfrm_replay_timer_handler(unsigned long data) | |
1671 | { | |
1672 | struct xfrm_state *x = (struct xfrm_state*)data; | |
1673 | ||
1674 | spin_lock(&x->lock); | |
1675 | ||
2717096a | 1676 | if (x->km.state == XFRM_STATE_VALID) { |
a6483b79 | 1677 | if (xfrm_aevent_is_on(xs_net(x))) |
2717096a JHS |
1678 | xfrm_replay_notify(x, XFRM_REPLAY_TIMEOUT); |
1679 | else | |
1680 | x->xflags |= XFRM_TIME_DEFER; | |
1681 | } | |
f8cd5488 JHS |
1682 | |
1683 | spin_unlock(&x->lock); | |
1684 | } | |
1685 | ||
afeb14b4 PM |
1686 | int xfrm_replay_check(struct xfrm_state *x, |
1687 | struct sk_buff *skb, __be32 net_seq) | |
1da177e4 LT |
1688 | { |
1689 | u32 diff; | |
a252cc23 | 1690 | u32 seq = ntohl(net_seq); |
1da177e4 LT |
1691 | |
1692 | if (unlikely(seq == 0)) | |
afeb14b4 | 1693 | goto err; |
1da177e4 LT |
1694 | |
1695 | if (likely(seq > x->replay.seq)) | |
1696 | return 0; | |
1697 | ||
1698 | diff = x->replay.seq - seq; | |
4c4d51a7 HX |
1699 | if (diff >= min_t(unsigned int, x->props.replay_window, |
1700 | sizeof(x->replay.bitmap) * 8)) { | |
1da177e4 | 1701 | x->stats.replay_window++; |
afeb14b4 | 1702 | goto err; |
1da177e4 LT |
1703 | } |
1704 | ||
1705 | if (x->replay.bitmap & (1U << diff)) { | |
1706 | x->stats.replay++; | |
afeb14b4 | 1707 | goto err; |
1da177e4 LT |
1708 | } |
1709 | return 0; | |
afeb14b4 PM |
1710 | |
1711 | err: | |
1712 | xfrm_audit_state_replay(x, skb, net_seq); | |
1713 | return -EINVAL; | |
1da177e4 | 1714 | } |
1da177e4 | 1715 | |
61f4627b | 1716 | void xfrm_replay_advance(struct xfrm_state *x, __be32 net_seq) |
1da177e4 LT |
1717 | { |
1718 | u32 diff; | |
61f4627b | 1719 | u32 seq = ntohl(net_seq); |
1da177e4 LT |
1720 | |
1721 | if (seq > x->replay.seq) { | |
1722 | diff = seq - x->replay.seq; | |
1723 | if (diff < x->props.replay_window) | |
1724 | x->replay.bitmap = ((x->replay.bitmap) << diff) | 1; | |
1725 | else | |
1726 | x->replay.bitmap = 1; | |
1727 | x->replay.seq = seq; | |
1728 | } else { | |
1729 | diff = x->replay.seq - seq; | |
1730 | x->replay.bitmap |= (1U << diff); | |
1731 | } | |
f8cd5488 | 1732 | |
a6483b79 | 1733 | if (xfrm_aevent_is_on(xs_net(x))) |
f8cd5488 | 1734 | xfrm_replay_notify(x, XFRM_REPLAY_UPDATE); |
1da177e4 | 1735 | } |
1da177e4 | 1736 | |
df01812e | 1737 | static LIST_HEAD(xfrm_km_list); |
1da177e4 LT |
1738 | static DEFINE_RWLOCK(xfrm_km_lock); |
1739 | ||
26b15dad | 1740 | void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c) |
1da177e4 LT |
1741 | { |
1742 | struct xfrm_mgr *km; | |
1743 | ||
26b15dad JHS |
1744 | read_lock(&xfrm_km_lock); |
1745 | list_for_each_entry(km, &xfrm_km_list, list) | |
1746 | if (km->notify_policy) | |
1747 | km->notify_policy(xp, dir, c); | |
1748 | read_unlock(&xfrm_km_lock); | |
1749 | } | |
1da177e4 | 1750 | |
26b15dad JHS |
1751 | void km_state_notify(struct xfrm_state *x, struct km_event *c) |
1752 | { | |
1753 | struct xfrm_mgr *km; | |
1da177e4 LT |
1754 | read_lock(&xfrm_km_lock); |
1755 | list_for_each_entry(km, &xfrm_km_list, list) | |
26b15dad JHS |
1756 | if (km->notify) |
1757 | km->notify(x, c); | |
1da177e4 | 1758 | read_unlock(&xfrm_km_lock); |
26b15dad JHS |
1759 | } |
1760 | ||
1761 | EXPORT_SYMBOL(km_policy_notify); | |
1762 | EXPORT_SYMBOL(km_state_notify); | |
1763 | ||
53bc6b4d | 1764 | void km_state_expired(struct xfrm_state *x, int hard, u32 pid) |
26b15dad | 1765 | { |
98806f75 | 1766 | struct net *net = xs_net(x); |
26b15dad JHS |
1767 | struct km_event c; |
1768 | ||
bf08867f | 1769 | c.data.hard = hard; |
53bc6b4d | 1770 | c.pid = pid; |
f60f6b8f | 1771 | c.event = XFRM_MSG_EXPIRE; |
26b15dad | 1772 | km_state_notify(x, &c); |
1da177e4 LT |
1773 | |
1774 | if (hard) | |
98806f75 | 1775 | wake_up(&net->xfrm.km_waitq); |
1da177e4 LT |
1776 | } |
1777 | ||
53bc6b4d | 1778 | EXPORT_SYMBOL(km_state_expired); |
26b15dad JHS |
1779 | /* |
1780 | * We send to all registered managers regardless of failure | |
1781 | * We are happy with one success | |
1782 | */ | |
980ebd25 | 1783 | int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol) |
1da177e4 | 1784 | { |
26b15dad | 1785 | int err = -EINVAL, acqret; |
1da177e4 LT |
1786 | struct xfrm_mgr *km; |
1787 | ||
1788 | read_lock(&xfrm_km_lock); | |
1789 | list_for_each_entry(km, &xfrm_km_list, list) { | |
26b15dad JHS |
1790 | acqret = km->acquire(x, t, pol, XFRM_POLICY_OUT); |
1791 | if (!acqret) | |
1792 | err = acqret; | |
1da177e4 LT |
1793 | } |
1794 | read_unlock(&xfrm_km_lock); | |
1795 | return err; | |
1796 | } | |
980ebd25 | 1797 | EXPORT_SYMBOL(km_query); |
1da177e4 | 1798 | |
5d36b180 | 1799 | int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport) |
1da177e4 LT |
1800 | { |
1801 | int err = -EINVAL; | |
1802 | struct xfrm_mgr *km; | |
1803 | ||
1804 | read_lock(&xfrm_km_lock); | |
1805 | list_for_each_entry(km, &xfrm_km_list, list) { | |
1806 | if (km->new_mapping) | |
1807 | err = km->new_mapping(x, ipaddr, sport); | |
1808 | if (!err) | |
1809 | break; | |
1810 | } | |
1811 | read_unlock(&xfrm_km_lock); | |
1812 | return err; | |
1813 | } | |
1814 | EXPORT_SYMBOL(km_new_mapping); | |
1815 | ||
6c5c8ca7 | 1816 | void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid) |
1da177e4 | 1817 | { |
98806f75 | 1818 | struct net *net = xp_net(pol); |
26b15dad | 1819 | struct km_event c; |
1da177e4 | 1820 | |
bf08867f | 1821 | c.data.hard = hard; |
6c5c8ca7 | 1822 | c.pid = pid; |
f60f6b8f | 1823 | c.event = XFRM_MSG_POLEXPIRE; |
26b15dad | 1824 | km_policy_notify(pol, dir, &c); |
1da177e4 LT |
1825 | |
1826 | if (hard) | |
98806f75 | 1827 | wake_up(&net->xfrm.km_waitq); |
1da177e4 | 1828 | } |
a70fcb0b | 1829 | EXPORT_SYMBOL(km_policy_expired); |
1da177e4 | 1830 | |
2d60abc2 | 1831 | #ifdef CONFIG_XFRM_MIGRATE |
80c9abaa | 1832 | int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type, |
13c1d189 AE |
1833 | struct xfrm_migrate *m, int num_migrate, |
1834 | struct xfrm_kmaddress *k) | |
80c9abaa SS |
1835 | { |
1836 | int err = -EINVAL; | |
1837 | int ret; | |
1838 | struct xfrm_mgr *km; | |
1839 | ||
1840 | read_lock(&xfrm_km_lock); | |
1841 | list_for_each_entry(km, &xfrm_km_list, list) { | |
1842 | if (km->migrate) { | |
13c1d189 | 1843 | ret = km->migrate(sel, dir, type, m, num_migrate, k); |
80c9abaa SS |
1844 | if (!ret) |
1845 | err = ret; | |
1846 | } | |
1847 | } | |
1848 | read_unlock(&xfrm_km_lock); | |
1849 | return err; | |
1850 | } | |
1851 | EXPORT_SYMBOL(km_migrate); | |
2d60abc2 | 1852 | #endif |
80c9abaa | 1853 | |
db983c11 | 1854 | int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr) |
97a64b45 MN |
1855 | { |
1856 | int err = -EINVAL; | |
1857 | int ret; | |
1858 | struct xfrm_mgr *km; | |
1859 | ||
1860 | read_lock(&xfrm_km_lock); | |
1861 | list_for_each_entry(km, &xfrm_km_list, list) { | |
1862 | if (km->report) { | |
db983c11 | 1863 | ret = km->report(net, proto, sel, addr); |
97a64b45 MN |
1864 | if (!ret) |
1865 | err = ret; | |
1866 | } | |
1867 | } | |
1868 | read_unlock(&xfrm_km_lock); | |
1869 | return err; | |
1870 | } | |
1871 | EXPORT_SYMBOL(km_report); | |
1872 | ||
1da177e4 LT |
1873 | int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen) |
1874 | { | |
1875 | int err; | |
1876 | u8 *data; | |
1877 | struct xfrm_mgr *km; | |
1878 | struct xfrm_policy *pol = NULL; | |
1879 | ||
1880 | if (optlen <= 0 || optlen > PAGE_SIZE) | |
1881 | return -EMSGSIZE; | |
1882 | ||
1883 | data = kmalloc(optlen, GFP_KERNEL); | |
1884 | if (!data) | |
1885 | return -ENOMEM; | |
1886 | ||
1887 | err = -EFAULT; | |
1888 | if (copy_from_user(data, optval, optlen)) | |
1889 | goto out; | |
1890 | ||
1891 | err = -EINVAL; | |
1892 | read_lock(&xfrm_km_lock); | |
1893 | list_for_each_entry(km, &xfrm_km_list, list) { | |
cb969f07 | 1894 | pol = km->compile_policy(sk, optname, data, |
1da177e4 LT |
1895 | optlen, &err); |
1896 | if (err >= 0) | |
1897 | break; | |
1898 | } | |
1899 | read_unlock(&xfrm_km_lock); | |
1900 | ||
1901 | if (err >= 0) { | |
1902 | xfrm_sk_policy_insert(sk, err, pol); | |
1903 | xfrm_pol_put(pol); | |
1904 | err = 0; | |
1905 | } | |
1906 | ||
1907 | out: | |
1908 | kfree(data); | |
1909 | return err; | |
1910 | } | |
1911 | EXPORT_SYMBOL(xfrm_user_policy); | |
1912 | ||
1913 | int xfrm_register_km(struct xfrm_mgr *km) | |
1914 | { | |
1915 | write_lock_bh(&xfrm_km_lock); | |
1916 | list_add_tail(&km->list, &xfrm_km_list); | |
1917 | write_unlock_bh(&xfrm_km_lock); | |
1918 | return 0; | |
1919 | } | |
1920 | EXPORT_SYMBOL(xfrm_register_km); | |
1921 | ||
1922 | int xfrm_unregister_km(struct xfrm_mgr *km) | |
1923 | { | |
1924 | write_lock_bh(&xfrm_km_lock); | |
1925 | list_del(&km->list); | |
1926 | write_unlock_bh(&xfrm_km_lock); | |
1927 | return 0; | |
1928 | } | |
1929 | EXPORT_SYMBOL(xfrm_unregister_km); | |
1930 | ||
1931 | int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo) | |
1932 | { | |
1933 | int err = 0; | |
1934 | if (unlikely(afinfo == NULL)) | |
1935 | return -EINVAL; | |
1936 | if (unlikely(afinfo->family >= NPROTO)) | |
1937 | return -EAFNOSUPPORT; | |
f3111502 | 1938 | write_lock_bh(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1939 | if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL)) |
1940 | err = -ENOBUFS; | |
edcd5821 | 1941 | else |
1da177e4 | 1942 | xfrm_state_afinfo[afinfo->family] = afinfo; |
f3111502 | 1943 | write_unlock_bh(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1944 | return err; |
1945 | } | |
1946 | EXPORT_SYMBOL(xfrm_state_register_afinfo); | |
1947 | ||
1948 | int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo) | |
1949 | { | |
1950 | int err = 0; | |
1951 | if (unlikely(afinfo == NULL)) | |
1952 | return -EINVAL; | |
1953 | if (unlikely(afinfo->family >= NPROTO)) | |
1954 | return -EAFNOSUPPORT; | |
f3111502 | 1955 | write_lock_bh(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1956 | if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) { |
1957 | if (unlikely(xfrm_state_afinfo[afinfo->family] != afinfo)) | |
1958 | err = -EINVAL; | |
edcd5821 | 1959 | else |
1da177e4 | 1960 | xfrm_state_afinfo[afinfo->family] = NULL; |
1da177e4 | 1961 | } |
f3111502 | 1962 | write_unlock_bh(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1963 | return err; |
1964 | } | |
1965 | EXPORT_SYMBOL(xfrm_state_unregister_afinfo); | |
1966 | ||
17c2a42a | 1967 | static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family) |
1da177e4 LT |
1968 | { |
1969 | struct xfrm_state_afinfo *afinfo; | |
1970 | if (unlikely(family >= NPROTO)) | |
1971 | return NULL; | |
1972 | read_lock(&xfrm_state_afinfo_lock); | |
1973 | afinfo = xfrm_state_afinfo[family]; | |
546be240 HX |
1974 | if (unlikely(!afinfo)) |
1975 | read_unlock(&xfrm_state_afinfo_lock); | |
1da177e4 LT |
1976 | return afinfo; |
1977 | } | |
1978 | ||
17c2a42a | 1979 | static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo) |
9a429c49 | 1980 | __releases(xfrm_state_afinfo_lock) |
1da177e4 | 1981 | { |
546be240 | 1982 | read_unlock(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1983 | } |
1984 | ||
1985 | /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */ | |
1986 | void xfrm_state_delete_tunnel(struct xfrm_state *x) | |
1987 | { | |
1988 | if (x->tunnel) { | |
1989 | struct xfrm_state *t = x->tunnel; | |
1990 | ||
1991 | if (atomic_read(&t->tunnel_users) == 2) | |
1992 | xfrm_state_delete(t); | |
1993 | atomic_dec(&t->tunnel_users); | |
1994 | xfrm_state_put(t); | |
1995 | x->tunnel = NULL; | |
1996 | } | |
1997 | } | |
1998 | EXPORT_SYMBOL(xfrm_state_delete_tunnel); | |
1999 | ||
2000 | int xfrm_state_mtu(struct xfrm_state *x, int mtu) | |
2001 | { | |
c5c25238 | 2002 | int res; |
1da177e4 | 2003 | |
c5c25238 PM |
2004 | spin_lock_bh(&x->lock); |
2005 | if (x->km.state == XFRM_STATE_VALID && | |
2006 | x->type && x->type->get_mtu) | |
2007 | res = x->type->get_mtu(x, mtu); | |
2008 | else | |
28121617 | 2009 | res = mtu - x->props.header_len; |
c5c25238 | 2010 | spin_unlock_bh(&x->lock); |
1da177e4 LT |
2011 | return res; |
2012 | } | |
2013 | ||
72cb6962 HX |
2014 | int xfrm_init_state(struct xfrm_state *x) |
2015 | { | |
d094cd83 | 2016 | struct xfrm_state_afinfo *afinfo; |
df9dcb45 | 2017 | struct xfrm_mode *inner_mode; |
d094cd83 | 2018 | int family = x->props.family; |
72cb6962 HX |
2019 | int err; |
2020 | ||
d094cd83 HX |
2021 | err = -EAFNOSUPPORT; |
2022 | afinfo = xfrm_state_get_afinfo(family); | |
2023 | if (!afinfo) | |
2024 | goto error; | |
2025 | ||
2026 | err = 0; | |
2027 | if (afinfo->init_flags) | |
2028 | err = afinfo->init_flags(x); | |
2029 | ||
2030 | xfrm_state_put_afinfo(afinfo); | |
2031 | ||
2032 | if (err) | |
2033 | goto error; | |
2034 | ||
2035 | err = -EPROTONOSUPPORT; | |
13996378 | 2036 | |
df9dcb45 KM |
2037 | if (x->sel.family != AF_UNSPEC) { |
2038 | inner_mode = xfrm_get_mode(x->props.mode, x->sel.family); | |
2039 | if (inner_mode == NULL) | |
2040 | goto error; | |
2041 | ||
2042 | if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) && | |
2043 | family != x->sel.family) { | |
2044 | xfrm_put_mode(inner_mode); | |
2045 | goto error; | |
2046 | } | |
2047 | ||
2048 | x->inner_mode = inner_mode; | |
2049 | } else { | |
2050 | struct xfrm_mode *inner_mode_iaf; | |
d81d2285 | 2051 | int iafamily = AF_INET; |
df9dcb45 | 2052 | |
d81d2285 | 2053 | inner_mode = xfrm_get_mode(x->props.mode, x->props.family); |
df9dcb45 KM |
2054 | if (inner_mode == NULL) |
2055 | goto error; | |
2056 | ||
2057 | if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL)) { | |
2058 | xfrm_put_mode(inner_mode); | |
2059 | goto error; | |
2060 | } | |
d81d2285 | 2061 | x->inner_mode = inner_mode; |
df9dcb45 | 2062 | |
d81d2285 MW |
2063 | if (x->props.family == AF_INET) |
2064 | iafamily = AF_INET6; | |
df9dcb45 | 2065 | |
d81d2285 MW |
2066 | inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily); |
2067 | if (inner_mode_iaf) { | |
2068 | if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL) | |
2069 | x->inner_mode_iaf = inner_mode_iaf; | |
2070 | else | |
2071 | xfrm_put_mode(inner_mode_iaf); | |
df9dcb45 KM |
2072 | } |
2073 | } | |
13996378 | 2074 | |
d094cd83 | 2075 | x->type = xfrm_get_type(x->id.proto, family); |
72cb6962 HX |
2076 | if (x->type == NULL) |
2077 | goto error; | |
2078 | ||
2079 | err = x->type->init_state(x); | |
2080 | if (err) | |
2081 | goto error; | |
2082 | ||
13996378 HX |
2083 | x->outer_mode = xfrm_get_mode(x->props.mode, family); |
2084 | if (x->outer_mode == NULL) | |
b59f45d0 HX |
2085 | goto error; |
2086 | ||
72cb6962 HX |
2087 | x->km.state = XFRM_STATE_VALID; |
2088 | ||
2089 | error: | |
2090 | return err; | |
2091 | } | |
2092 | ||
2093 | EXPORT_SYMBOL(xfrm_init_state); | |
a716c119 | 2094 | |
d62ddc21 | 2095 | int __net_init xfrm_state_init(struct net *net) |
1da177e4 | 2096 | { |
f034b5d4 DM |
2097 | unsigned int sz; |
2098 | ||
9d4139c7 AD |
2099 | INIT_LIST_HEAD(&net->xfrm.state_all); |
2100 | ||
f034b5d4 DM |
2101 | sz = sizeof(struct hlist_head) * 8; |
2102 | ||
73d189dc AD |
2103 | net->xfrm.state_bydst = xfrm_hash_alloc(sz); |
2104 | if (!net->xfrm.state_bydst) | |
2105 | goto out_bydst; | |
d320bbb3 AD |
2106 | net->xfrm.state_bysrc = xfrm_hash_alloc(sz); |
2107 | if (!net->xfrm.state_bysrc) | |
2108 | goto out_bysrc; | |
b754a4fd AD |
2109 | net->xfrm.state_byspi = xfrm_hash_alloc(sz); |
2110 | if (!net->xfrm.state_byspi) | |
2111 | goto out_byspi; | |
529983ec | 2112 | net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1); |
1da177e4 | 2113 | |
0bf7c5b0 | 2114 | net->xfrm.state_num = 0; |
63082733 | 2115 | INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize); |
b8a0ae20 | 2116 | INIT_HLIST_HEAD(&net->xfrm.state_gc_list); |
c7837144 | 2117 | INIT_WORK(&net->xfrm.state_gc_work, xfrm_state_gc_task); |
50a30657 | 2118 | init_waitqueue_head(&net->xfrm.km_waitq); |
d62ddc21 | 2119 | return 0; |
73d189dc | 2120 | |
b754a4fd AD |
2121 | out_byspi: |
2122 | xfrm_hash_free(net->xfrm.state_bysrc, sz); | |
d320bbb3 AD |
2123 | out_bysrc: |
2124 | xfrm_hash_free(net->xfrm.state_bydst, sz); | |
73d189dc AD |
2125 | out_bydst: |
2126 | return -ENOMEM; | |
d62ddc21 AD |
2127 | } |
2128 | ||
2129 | void xfrm_state_fini(struct net *net) | |
2130 | { | |
7c2776ee | 2131 | struct xfrm_audit audit_info; |
73d189dc AD |
2132 | unsigned int sz; |
2133 | ||
7c2776ee AD |
2134 | flush_work(&net->xfrm.state_hash_work); |
2135 | audit_info.loginuid = -1; | |
2136 | audit_info.sessionid = -1; | |
2137 | audit_info.secid = 0; | |
2138 | xfrm_state_flush(net, IPSEC_PROTO_ANY, &audit_info); | |
2139 | flush_work(&net->xfrm.state_gc_work); | |
2140 | ||
9d4139c7 | 2141 | WARN_ON(!list_empty(&net->xfrm.state_all)); |
73d189dc | 2142 | |
529983ec | 2143 | sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head); |
b754a4fd AD |
2144 | WARN_ON(!hlist_empty(net->xfrm.state_byspi)); |
2145 | xfrm_hash_free(net->xfrm.state_byspi, sz); | |
d320bbb3 AD |
2146 | WARN_ON(!hlist_empty(net->xfrm.state_bysrc)); |
2147 | xfrm_hash_free(net->xfrm.state_bysrc, sz); | |
73d189dc AD |
2148 | WARN_ON(!hlist_empty(net->xfrm.state_bydst)); |
2149 | xfrm_hash_free(net->xfrm.state_bydst, sz); | |
1da177e4 LT |
2150 | } |
2151 | ||
ab5f5e8b | 2152 | #ifdef CONFIG_AUDITSYSCALL |
cf35f43e IJ |
2153 | static void xfrm_audit_helper_sainfo(struct xfrm_state *x, |
2154 | struct audit_buffer *audit_buf) | |
ab5f5e8b | 2155 | { |
68277acc PM |
2156 | struct xfrm_sec_ctx *ctx = x->security; |
2157 | u32 spi = ntohl(x->id.spi); | |
2158 | ||
2159 | if (ctx) | |
ab5f5e8b | 2160 | audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s", |
68277acc | 2161 | ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str); |
ab5f5e8b JL |
2162 | |
2163 | switch(x->props.family) { | |
2164 | case AF_INET: | |
21454aaa HH |
2165 | audit_log_format(audit_buf, " src=%pI4 dst=%pI4", |
2166 | &x->props.saddr.a4, &x->id.daddr.a4); | |
ab5f5e8b JL |
2167 | break; |
2168 | case AF_INET6: | |
5b095d98 | 2169 | audit_log_format(audit_buf, " src=%pI6 dst=%pI6", |
fdb46ee7 | 2170 | x->props.saddr.a6, x->id.daddr.a6); |
ab5f5e8b JL |
2171 | break; |
2172 | } | |
68277acc PM |
2173 | |
2174 | audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi); | |
ab5f5e8b JL |
2175 | } |
2176 | ||
cf35f43e IJ |
2177 | static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family, |
2178 | struct audit_buffer *audit_buf) | |
afeb14b4 PM |
2179 | { |
2180 | struct iphdr *iph4; | |
2181 | struct ipv6hdr *iph6; | |
2182 | ||
2183 | switch (family) { | |
2184 | case AF_INET: | |
2185 | iph4 = ip_hdr(skb); | |
21454aaa HH |
2186 | audit_log_format(audit_buf, " src=%pI4 dst=%pI4", |
2187 | &iph4->saddr, &iph4->daddr); | |
afeb14b4 PM |
2188 | break; |
2189 | case AF_INET6: | |
2190 | iph6 = ipv6_hdr(skb); | |
2191 | audit_log_format(audit_buf, | |
5b095d98 | 2192 | " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x", |
fdb46ee7 | 2193 | &iph6->saddr,&iph6->daddr, |
afeb14b4 PM |
2194 | iph6->flow_lbl[0] & 0x0f, |
2195 | iph6->flow_lbl[1], | |
2196 | iph6->flow_lbl[2]); | |
2197 | break; | |
2198 | } | |
2199 | } | |
2200 | ||
68277acc | 2201 | void xfrm_audit_state_add(struct xfrm_state *x, int result, |
2532386f | 2202 | uid_t auid, u32 sessionid, u32 secid) |
ab5f5e8b JL |
2203 | { |
2204 | struct audit_buffer *audit_buf; | |
ab5f5e8b | 2205 | |
afeb14b4 | 2206 | audit_buf = xfrm_audit_start("SAD-add"); |
ab5f5e8b JL |
2207 | if (audit_buf == NULL) |
2208 | return; | |
2532386f | 2209 | xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); |
afeb14b4 PM |
2210 | xfrm_audit_helper_sainfo(x, audit_buf); |
2211 | audit_log_format(audit_buf, " res=%u", result); | |
ab5f5e8b JL |
2212 | audit_log_end(audit_buf); |
2213 | } | |
2214 | EXPORT_SYMBOL_GPL(xfrm_audit_state_add); | |
2215 | ||
68277acc | 2216 | void xfrm_audit_state_delete(struct xfrm_state *x, int result, |
2532386f | 2217 | uid_t auid, u32 sessionid, u32 secid) |
ab5f5e8b JL |
2218 | { |
2219 | struct audit_buffer *audit_buf; | |
ab5f5e8b | 2220 | |
afeb14b4 | 2221 | audit_buf = xfrm_audit_start("SAD-delete"); |
ab5f5e8b JL |
2222 | if (audit_buf == NULL) |
2223 | return; | |
2532386f | 2224 | xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); |
afeb14b4 PM |
2225 | xfrm_audit_helper_sainfo(x, audit_buf); |
2226 | audit_log_format(audit_buf, " res=%u", result); | |
ab5f5e8b JL |
2227 | audit_log_end(audit_buf); |
2228 | } | |
2229 | EXPORT_SYMBOL_GPL(xfrm_audit_state_delete); | |
afeb14b4 PM |
2230 | |
2231 | void xfrm_audit_state_replay_overflow(struct xfrm_state *x, | |
2232 | struct sk_buff *skb) | |
2233 | { | |
2234 | struct audit_buffer *audit_buf; | |
2235 | u32 spi; | |
2236 | ||
2237 | audit_buf = xfrm_audit_start("SA-replay-overflow"); | |
2238 | if (audit_buf == NULL) | |
2239 | return; | |
2240 | xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); | |
2241 | /* don't record the sequence number because it's inherent in this kind | |
2242 | * of audit message */ | |
2243 | spi = ntohl(x->id.spi); | |
2244 | audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi); | |
2245 | audit_log_end(audit_buf); | |
2246 | } | |
2247 | EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow); | |
2248 | ||
2249 | static void xfrm_audit_state_replay(struct xfrm_state *x, | |
2250 | struct sk_buff *skb, __be32 net_seq) | |
2251 | { | |
2252 | struct audit_buffer *audit_buf; | |
2253 | u32 spi; | |
2254 | ||
2255 | audit_buf = xfrm_audit_start("SA-replayed-pkt"); | |
2256 | if (audit_buf == NULL) | |
2257 | return; | |
2258 | xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); | |
2259 | spi = ntohl(x->id.spi); | |
2260 | audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", | |
2261 | spi, spi, ntohl(net_seq)); | |
2262 | audit_log_end(audit_buf); | |
2263 | } | |
2264 | ||
2265 | void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family) | |
2266 | { | |
2267 | struct audit_buffer *audit_buf; | |
2268 | ||
2269 | audit_buf = xfrm_audit_start("SA-notfound"); | |
2270 | if (audit_buf == NULL) | |
2271 | return; | |
2272 | xfrm_audit_helper_pktinfo(skb, family, audit_buf); | |
2273 | audit_log_end(audit_buf); | |
2274 | } | |
2275 | EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple); | |
2276 | ||
2277 | void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, | |
2278 | __be32 net_spi, __be32 net_seq) | |
2279 | { | |
2280 | struct audit_buffer *audit_buf; | |
2281 | u32 spi; | |
2282 | ||
2283 | audit_buf = xfrm_audit_start("SA-notfound"); | |
2284 | if (audit_buf == NULL) | |
2285 | return; | |
2286 | xfrm_audit_helper_pktinfo(skb, family, audit_buf); | |
2287 | spi = ntohl(net_spi); | |
2288 | audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", | |
2289 | spi, spi, ntohl(net_seq)); | |
2290 | audit_log_end(audit_buf); | |
2291 | } | |
2292 | EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound); | |
2293 | ||
2294 | void xfrm_audit_state_icvfail(struct xfrm_state *x, | |
2295 | struct sk_buff *skb, u8 proto) | |
2296 | { | |
2297 | struct audit_buffer *audit_buf; | |
2298 | __be32 net_spi; | |
2299 | __be32 net_seq; | |
2300 | ||
2301 | audit_buf = xfrm_audit_start("SA-icv-failure"); | |
2302 | if (audit_buf == NULL) | |
2303 | return; | |
2304 | xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); | |
2305 | if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) { | |
2306 | u32 spi = ntohl(net_spi); | |
2307 | audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", | |
2308 | spi, spi, ntohl(net_seq)); | |
2309 | } | |
2310 | audit_log_end(audit_buf); | |
2311 | } | |
2312 | EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail); | |
ab5f5e8b | 2313 | #endif /* CONFIG_AUDITSYSCALL */ |