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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 | ||
47 | /* Hash table to find appropriate SA towards given target (endpoint | |
48 | * of tunnel or destination of transport mode) allowed by selector. | |
49 | * | |
50 | * Main use is finding SA after policy selected tunnel or transport mode. | |
51 | * Also, it can be used by ah/esp icmp error handler to find offending SA. | |
52 | */ | |
4c563f76 | 53 | static LIST_HEAD(xfrm_state_all); |
f034b5d4 DM |
54 | static struct hlist_head *xfrm_state_bydst __read_mostly; |
55 | static struct hlist_head *xfrm_state_bysrc __read_mostly; | |
56 | static struct hlist_head *xfrm_state_byspi __read_mostly; | |
57 | static unsigned int xfrm_state_hmask __read_mostly; | |
58 | static unsigned int xfrm_state_hashmax __read_mostly = 1 * 1024 * 1024; | |
59 | static unsigned int xfrm_state_num; | |
9d4a706d | 60 | static unsigned int xfrm_state_genid; |
f034b5d4 | 61 | |
17c2a42a HX |
62 | static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family); |
63 | static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo); | |
64 | ||
afeb14b4 PM |
65 | #ifdef CONFIG_AUDITSYSCALL |
66 | static void xfrm_audit_state_replay(struct xfrm_state *x, | |
67 | struct sk_buff *skb, __be32 net_seq); | |
68 | #else | |
69 | #define xfrm_audit_state_replay(x, s, sq) do { ; } while (0) | |
70 | #endif /* CONFIG_AUDITSYSCALL */ | |
71 | ||
c1969f29 DM |
72 | static inline unsigned int xfrm_dst_hash(xfrm_address_t *daddr, |
73 | xfrm_address_t *saddr, | |
74 | u32 reqid, | |
a624c108 | 75 | unsigned short family) |
f034b5d4 | 76 | { |
c1969f29 | 77 | return __xfrm_dst_hash(daddr, saddr, reqid, family, xfrm_state_hmask); |
f034b5d4 DM |
78 | } |
79 | ||
667bbcb6 MN |
80 | static inline unsigned int xfrm_src_hash(xfrm_address_t *daddr, |
81 | xfrm_address_t *saddr, | |
44e36b42 | 82 | unsigned short family) |
f034b5d4 | 83 | { |
667bbcb6 | 84 | return __xfrm_src_hash(daddr, saddr, family, xfrm_state_hmask); |
f034b5d4 DM |
85 | } |
86 | ||
f034b5d4 | 87 | static inline unsigned int |
8122adf0 | 88 | xfrm_spi_hash(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family) |
f034b5d4 | 89 | { |
c1969f29 | 90 | return __xfrm_spi_hash(daddr, spi, proto, family, xfrm_state_hmask); |
f034b5d4 DM |
91 | } |
92 | ||
f034b5d4 DM |
93 | static void xfrm_hash_transfer(struct hlist_head *list, |
94 | struct hlist_head *ndsttable, | |
95 | struct hlist_head *nsrctable, | |
96 | struct hlist_head *nspitable, | |
97 | unsigned int nhashmask) | |
98 | { | |
99 | struct hlist_node *entry, *tmp; | |
100 | struct xfrm_state *x; | |
101 | ||
102 | hlist_for_each_entry_safe(x, entry, tmp, list, bydst) { | |
103 | unsigned int h; | |
104 | ||
c1969f29 DM |
105 | h = __xfrm_dst_hash(&x->id.daddr, &x->props.saddr, |
106 | x->props.reqid, x->props.family, | |
107 | nhashmask); | |
f034b5d4 DM |
108 | hlist_add_head(&x->bydst, ndsttable+h); |
109 | ||
667bbcb6 MN |
110 | h = __xfrm_src_hash(&x->id.daddr, &x->props.saddr, |
111 | x->props.family, | |
f034b5d4 DM |
112 | nhashmask); |
113 | hlist_add_head(&x->bysrc, nsrctable+h); | |
114 | ||
7b4dc360 MN |
115 | if (x->id.spi) { |
116 | h = __xfrm_spi_hash(&x->id.daddr, x->id.spi, | |
117 | x->id.proto, x->props.family, | |
118 | nhashmask); | |
119 | hlist_add_head(&x->byspi, nspitable+h); | |
120 | } | |
f034b5d4 DM |
121 | } |
122 | } | |
123 | ||
124 | static unsigned long xfrm_hash_new_size(void) | |
125 | { | |
126 | return ((xfrm_state_hmask + 1) << 1) * | |
127 | sizeof(struct hlist_head); | |
128 | } | |
129 | ||
130 | static DEFINE_MUTEX(hash_resize_mutex); | |
131 | ||
c4028958 | 132 | static void xfrm_hash_resize(struct work_struct *__unused) |
f034b5d4 DM |
133 | { |
134 | struct hlist_head *ndst, *nsrc, *nspi, *odst, *osrc, *ospi; | |
135 | unsigned long nsize, osize; | |
136 | unsigned int nhashmask, ohashmask; | |
137 | int i; | |
138 | ||
139 | mutex_lock(&hash_resize_mutex); | |
140 | ||
141 | nsize = xfrm_hash_new_size(); | |
44e36b42 | 142 | ndst = xfrm_hash_alloc(nsize); |
f034b5d4 DM |
143 | if (!ndst) |
144 | goto out_unlock; | |
44e36b42 | 145 | nsrc = xfrm_hash_alloc(nsize); |
f034b5d4 | 146 | if (!nsrc) { |
44e36b42 | 147 | xfrm_hash_free(ndst, nsize); |
f034b5d4 DM |
148 | goto out_unlock; |
149 | } | |
44e36b42 | 150 | nspi = xfrm_hash_alloc(nsize); |
f034b5d4 | 151 | if (!nspi) { |
44e36b42 DM |
152 | xfrm_hash_free(ndst, nsize); |
153 | xfrm_hash_free(nsrc, nsize); | |
f034b5d4 DM |
154 | goto out_unlock; |
155 | } | |
156 | ||
157 | spin_lock_bh(&xfrm_state_lock); | |
158 | ||
159 | nhashmask = (nsize / sizeof(struct hlist_head)) - 1U; | |
160 | for (i = xfrm_state_hmask; i >= 0; i--) | |
161 | xfrm_hash_transfer(xfrm_state_bydst+i, ndst, nsrc, nspi, | |
162 | nhashmask); | |
163 | ||
164 | odst = xfrm_state_bydst; | |
165 | osrc = xfrm_state_bysrc; | |
166 | ospi = xfrm_state_byspi; | |
167 | ohashmask = xfrm_state_hmask; | |
168 | ||
169 | xfrm_state_bydst = ndst; | |
170 | xfrm_state_bysrc = nsrc; | |
171 | xfrm_state_byspi = nspi; | |
172 | xfrm_state_hmask = nhashmask; | |
173 | ||
174 | spin_unlock_bh(&xfrm_state_lock); | |
175 | ||
176 | osize = (ohashmask + 1) * sizeof(struct hlist_head); | |
44e36b42 DM |
177 | xfrm_hash_free(odst, osize); |
178 | xfrm_hash_free(osrc, osize); | |
179 | xfrm_hash_free(ospi, osize); | |
f034b5d4 DM |
180 | |
181 | out_unlock: | |
182 | mutex_unlock(&hash_resize_mutex); | |
183 | } | |
184 | ||
c4028958 | 185 | static DECLARE_WORK(xfrm_hash_work, xfrm_hash_resize); |
f034b5d4 | 186 | |
1da177e4 LT |
187 | DECLARE_WAIT_QUEUE_HEAD(km_waitq); |
188 | EXPORT_SYMBOL(km_waitq); | |
189 | ||
190 | static DEFINE_RWLOCK(xfrm_state_afinfo_lock); | |
191 | static struct xfrm_state_afinfo *xfrm_state_afinfo[NPROTO]; | |
192 | ||
193 | static struct work_struct xfrm_state_gc_work; | |
12a169e7 | 194 | static HLIST_HEAD(xfrm_state_gc_list); |
1da177e4 LT |
195 | static DEFINE_SPINLOCK(xfrm_state_gc_lock); |
196 | ||
53bc6b4d | 197 | int __xfrm_state_delete(struct xfrm_state *x); |
1da177e4 | 198 | |
980ebd25 | 199 | int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol); |
53bc6b4d | 200 | void km_state_expired(struct xfrm_state *x, int hard, u32 pid); |
1da177e4 | 201 | |
aa5d62cc HX |
202 | static struct xfrm_state_afinfo *xfrm_state_lock_afinfo(unsigned int family) |
203 | { | |
204 | struct xfrm_state_afinfo *afinfo; | |
205 | if (unlikely(family >= NPROTO)) | |
206 | return NULL; | |
207 | write_lock_bh(&xfrm_state_afinfo_lock); | |
208 | afinfo = xfrm_state_afinfo[family]; | |
209 | if (unlikely(!afinfo)) | |
210 | write_unlock_bh(&xfrm_state_afinfo_lock); | |
211 | return afinfo; | |
212 | } | |
213 | ||
214 | static void xfrm_state_unlock_afinfo(struct xfrm_state_afinfo *afinfo) | |
9a429c49 | 215 | __releases(xfrm_state_afinfo_lock) |
aa5d62cc HX |
216 | { |
217 | write_unlock_bh(&xfrm_state_afinfo_lock); | |
218 | } | |
219 | ||
533cb5b0 | 220 | int xfrm_register_type(const struct xfrm_type *type, unsigned short family) |
aa5d62cc HX |
221 | { |
222 | struct xfrm_state_afinfo *afinfo = xfrm_state_lock_afinfo(family); | |
533cb5b0 | 223 | const struct xfrm_type **typemap; |
aa5d62cc HX |
224 | int err = 0; |
225 | ||
226 | if (unlikely(afinfo == NULL)) | |
227 | return -EAFNOSUPPORT; | |
228 | typemap = afinfo->type_map; | |
229 | ||
230 | if (likely(typemap[type->proto] == NULL)) | |
231 | typemap[type->proto] = type; | |
232 | else | |
233 | err = -EEXIST; | |
234 | xfrm_state_unlock_afinfo(afinfo); | |
235 | return err; | |
236 | } | |
237 | EXPORT_SYMBOL(xfrm_register_type); | |
238 | ||
533cb5b0 | 239 | int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family) |
aa5d62cc HX |
240 | { |
241 | struct xfrm_state_afinfo *afinfo = xfrm_state_lock_afinfo(family); | |
533cb5b0 | 242 | const struct xfrm_type **typemap; |
aa5d62cc HX |
243 | int err = 0; |
244 | ||
245 | if (unlikely(afinfo == NULL)) | |
246 | return -EAFNOSUPPORT; | |
247 | typemap = afinfo->type_map; | |
248 | ||
249 | if (unlikely(typemap[type->proto] != type)) | |
250 | err = -ENOENT; | |
251 | else | |
252 | typemap[type->proto] = NULL; | |
253 | xfrm_state_unlock_afinfo(afinfo); | |
254 | return err; | |
255 | } | |
256 | EXPORT_SYMBOL(xfrm_unregister_type); | |
257 | ||
533cb5b0 | 258 | static const struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family) |
aa5d62cc HX |
259 | { |
260 | struct xfrm_state_afinfo *afinfo; | |
533cb5b0 ED |
261 | const struct xfrm_type **typemap; |
262 | const struct xfrm_type *type; | |
aa5d62cc HX |
263 | int modload_attempted = 0; |
264 | ||
265 | retry: | |
266 | afinfo = xfrm_state_get_afinfo(family); | |
267 | if (unlikely(afinfo == NULL)) | |
268 | return NULL; | |
269 | typemap = afinfo->type_map; | |
270 | ||
271 | type = typemap[proto]; | |
272 | if (unlikely(type && !try_module_get(type->owner))) | |
273 | type = NULL; | |
274 | if (!type && !modload_attempted) { | |
275 | xfrm_state_put_afinfo(afinfo); | |
276 | request_module("xfrm-type-%d-%d", family, proto); | |
277 | modload_attempted = 1; | |
278 | goto retry; | |
279 | } | |
280 | ||
281 | xfrm_state_put_afinfo(afinfo); | |
282 | return type; | |
283 | } | |
284 | ||
533cb5b0 | 285 | static void xfrm_put_type(const struct xfrm_type *type) |
aa5d62cc HX |
286 | { |
287 | module_put(type->owner); | |
288 | } | |
289 | ||
290 | int xfrm_register_mode(struct xfrm_mode *mode, int family) | |
291 | { | |
292 | struct xfrm_state_afinfo *afinfo; | |
293 | struct xfrm_mode **modemap; | |
294 | int err; | |
295 | ||
296 | if (unlikely(mode->encap >= XFRM_MODE_MAX)) | |
297 | return -EINVAL; | |
298 | ||
299 | afinfo = xfrm_state_lock_afinfo(family); | |
300 | if (unlikely(afinfo == NULL)) | |
301 | return -EAFNOSUPPORT; | |
302 | ||
303 | err = -EEXIST; | |
304 | modemap = afinfo->mode_map; | |
17c2a42a HX |
305 | if (modemap[mode->encap]) |
306 | goto out; | |
aa5d62cc | 307 | |
17c2a42a HX |
308 | err = -ENOENT; |
309 | if (!try_module_get(afinfo->owner)) | |
310 | goto out; | |
311 | ||
312 | mode->afinfo = afinfo; | |
313 | modemap[mode->encap] = mode; | |
314 | err = 0; | |
315 | ||
316 | out: | |
aa5d62cc HX |
317 | xfrm_state_unlock_afinfo(afinfo); |
318 | return err; | |
319 | } | |
320 | EXPORT_SYMBOL(xfrm_register_mode); | |
321 | ||
322 | int xfrm_unregister_mode(struct xfrm_mode *mode, int family) | |
323 | { | |
324 | struct xfrm_state_afinfo *afinfo; | |
325 | struct xfrm_mode **modemap; | |
326 | int err; | |
327 | ||
328 | if (unlikely(mode->encap >= XFRM_MODE_MAX)) | |
329 | return -EINVAL; | |
330 | ||
331 | afinfo = xfrm_state_lock_afinfo(family); | |
332 | if (unlikely(afinfo == NULL)) | |
333 | return -EAFNOSUPPORT; | |
334 | ||
335 | err = -ENOENT; | |
336 | modemap = afinfo->mode_map; | |
337 | if (likely(modemap[mode->encap] == mode)) { | |
338 | modemap[mode->encap] = NULL; | |
17c2a42a | 339 | module_put(mode->afinfo->owner); |
aa5d62cc HX |
340 | err = 0; |
341 | } | |
342 | ||
343 | xfrm_state_unlock_afinfo(afinfo); | |
344 | return err; | |
345 | } | |
346 | EXPORT_SYMBOL(xfrm_unregister_mode); | |
347 | ||
348 | static struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family) | |
349 | { | |
350 | struct xfrm_state_afinfo *afinfo; | |
351 | struct xfrm_mode *mode; | |
352 | int modload_attempted = 0; | |
353 | ||
354 | if (unlikely(encap >= XFRM_MODE_MAX)) | |
355 | return NULL; | |
356 | ||
357 | retry: | |
358 | afinfo = xfrm_state_get_afinfo(family); | |
359 | if (unlikely(afinfo == NULL)) | |
360 | return NULL; | |
361 | ||
362 | mode = afinfo->mode_map[encap]; | |
363 | if (unlikely(mode && !try_module_get(mode->owner))) | |
364 | mode = NULL; | |
365 | if (!mode && !modload_attempted) { | |
366 | xfrm_state_put_afinfo(afinfo); | |
367 | request_module("xfrm-mode-%d-%d", family, encap); | |
368 | modload_attempted = 1; | |
369 | goto retry; | |
370 | } | |
371 | ||
372 | xfrm_state_put_afinfo(afinfo); | |
373 | return mode; | |
374 | } | |
375 | ||
376 | static void xfrm_put_mode(struct xfrm_mode *mode) | |
377 | { | |
378 | module_put(mode->owner); | |
379 | } | |
380 | ||
1da177e4 LT |
381 | static void xfrm_state_gc_destroy(struct xfrm_state *x) |
382 | { | |
a47f0ce0 DM |
383 | del_timer_sync(&x->timer); |
384 | del_timer_sync(&x->rtimer); | |
a51482bd JJ |
385 | kfree(x->aalg); |
386 | kfree(x->ealg); | |
387 | kfree(x->calg); | |
388 | kfree(x->encap); | |
060f02a3 | 389 | kfree(x->coaddr); |
13996378 HX |
390 | if (x->inner_mode) |
391 | xfrm_put_mode(x->inner_mode); | |
df9dcb45 KM |
392 | if (x->inner_mode_iaf) |
393 | xfrm_put_mode(x->inner_mode_iaf); | |
13996378 HX |
394 | if (x->outer_mode) |
395 | xfrm_put_mode(x->outer_mode); | |
1da177e4 LT |
396 | if (x->type) { |
397 | x->type->destructor(x); | |
398 | xfrm_put_type(x->type); | |
399 | } | |
df71837d | 400 | security_xfrm_state_free(x); |
1da177e4 LT |
401 | kfree(x); |
402 | } | |
403 | ||
c4028958 | 404 | static void xfrm_state_gc_task(struct work_struct *data) |
1da177e4 | 405 | { |
12a169e7 HX |
406 | struct xfrm_state *x; |
407 | struct hlist_node *entry, *tmp; | |
408 | struct hlist_head gc_list; | |
1da177e4 | 409 | |
1da177e4 | 410 | spin_lock_bh(&xfrm_state_gc_lock); |
12a169e7 | 411 | hlist_move_list(&xfrm_state_gc_list, &gc_list); |
1da177e4 LT |
412 | spin_unlock_bh(&xfrm_state_gc_lock); |
413 | ||
12a169e7 | 414 | hlist_for_each_entry_safe(x, entry, tmp, &gc_list, gclist) |
1da177e4 | 415 | xfrm_state_gc_destroy(x); |
8f126e37 | 416 | |
1da177e4 LT |
417 | wake_up(&km_waitq); |
418 | } | |
419 | ||
420 | static inline unsigned long make_jiffies(long secs) | |
421 | { | |
422 | if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ) | |
423 | return MAX_SCHEDULE_TIMEOUT-1; | |
424 | else | |
a716c119 | 425 | return secs*HZ; |
1da177e4 LT |
426 | } |
427 | ||
428 | static void xfrm_timer_handler(unsigned long data) | |
429 | { | |
430 | struct xfrm_state *x = (struct xfrm_state*)data; | |
9d729f72 | 431 | unsigned long now = get_seconds(); |
1da177e4 LT |
432 | long next = LONG_MAX; |
433 | int warn = 0; | |
161a09e7 | 434 | int err = 0; |
1da177e4 LT |
435 | |
436 | spin_lock(&x->lock); | |
437 | if (x->km.state == XFRM_STATE_DEAD) | |
438 | goto out; | |
439 | if (x->km.state == XFRM_STATE_EXPIRED) | |
440 | goto expired; | |
441 | if (x->lft.hard_add_expires_seconds) { | |
442 | long tmo = x->lft.hard_add_expires_seconds + | |
443 | x->curlft.add_time - now; | |
444 | if (tmo <= 0) | |
445 | goto expired; | |
446 | if (tmo < next) | |
447 | next = tmo; | |
448 | } | |
449 | if (x->lft.hard_use_expires_seconds) { | |
450 | long tmo = x->lft.hard_use_expires_seconds + | |
451 | (x->curlft.use_time ? : now) - now; | |
452 | if (tmo <= 0) | |
453 | goto expired; | |
454 | if (tmo < next) | |
455 | next = tmo; | |
456 | } | |
457 | if (x->km.dying) | |
458 | goto resched; | |
459 | if (x->lft.soft_add_expires_seconds) { | |
460 | long tmo = x->lft.soft_add_expires_seconds + | |
461 | x->curlft.add_time - now; | |
462 | if (tmo <= 0) | |
463 | warn = 1; | |
464 | else if (tmo < next) | |
465 | next = tmo; | |
466 | } | |
467 | if (x->lft.soft_use_expires_seconds) { | |
468 | long tmo = x->lft.soft_use_expires_seconds + | |
469 | (x->curlft.use_time ? : now) - now; | |
470 | if (tmo <= 0) | |
471 | warn = 1; | |
472 | else if (tmo < next) | |
473 | next = tmo; | |
474 | } | |
475 | ||
4666faab | 476 | x->km.dying = warn; |
1da177e4 | 477 | if (warn) |
53bc6b4d | 478 | km_state_expired(x, 0, 0); |
1da177e4 | 479 | resched: |
a47f0ce0 DM |
480 | if (next != LONG_MAX) |
481 | mod_timer(&x->timer, jiffies + make_jiffies(next)); | |
482 | ||
1da177e4 LT |
483 | goto out; |
484 | ||
485 | expired: | |
486 | if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0) { | |
487 | x->km.state = XFRM_STATE_EXPIRED; | |
488 | wake_up(&km_waitq); | |
489 | next = 2; | |
490 | goto resched; | |
491 | } | |
161a09e7 JL |
492 | |
493 | err = __xfrm_state_delete(x); | |
494 | if (!err && x->id.spi) | |
53bc6b4d | 495 | km_state_expired(x, 1, 0); |
1da177e4 | 496 | |
ab5f5e8b | 497 | xfrm_audit_state_delete(x, err ? 0 : 1, |
2532386f EP |
498 | audit_get_loginuid(current), |
499 | audit_get_sessionid(current), 0); | |
161a09e7 | 500 | |
1da177e4 LT |
501 | out: |
502 | spin_unlock(&x->lock); | |
1da177e4 LT |
503 | } |
504 | ||
0ac84752 DM |
505 | static void xfrm_replay_timer_handler(unsigned long data); |
506 | ||
1da177e4 LT |
507 | struct xfrm_state *xfrm_state_alloc(void) |
508 | { | |
509 | struct xfrm_state *x; | |
510 | ||
0da974f4 | 511 | x = kzalloc(sizeof(struct xfrm_state), GFP_ATOMIC); |
1da177e4 LT |
512 | |
513 | if (x) { | |
1da177e4 LT |
514 | atomic_set(&x->refcnt, 1); |
515 | atomic_set(&x->tunnel_users, 0); | |
12a169e7 | 516 | INIT_LIST_HEAD(&x->km.all); |
8f126e37 DM |
517 | INIT_HLIST_NODE(&x->bydst); |
518 | INIT_HLIST_NODE(&x->bysrc); | |
519 | INIT_HLIST_NODE(&x->byspi); | |
b24b8a24 PE |
520 | setup_timer(&x->timer, xfrm_timer_handler, (unsigned long)x); |
521 | setup_timer(&x->rtimer, xfrm_replay_timer_handler, | |
522 | (unsigned long)x); | |
9d729f72 | 523 | x->curlft.add_time = get_seconds(); |
1da177e4 LT |
524 | x->lft.soft_byte_limit = XFRM_INF; |
525 | x->lft.soft_packet_limit = XFRM_INF; | |
526 | x->lft.hard_byte_limit = XFRM_INF; | |
527 | x->lft.hard_packet_limit = XFRM_INF; | |
f8cd5488 JHS |
528 | x->replay_maxage = 0; |
529 | x->replay_maxdiff = 0; | |
df9dcb45 KM |
530 | x->inner_mode = NULL; |
531 | x->inner_mode_iaf = NULL; | |
1da177e4 LT |
532 | spin_lock_init(&x->lock); |
533 | } | |
534 | return x; | |
535 | } | |
536 | EXPORT_SYMBOL(xfrm_state_alloc); | |
537 | ||
538 | void __xfrm_state_destroy(struct xfrm_state *x) | |
539 | { | |
547b792c | 540 | WARN_ON(x->km.state != XFRM_STATE_DEAD); |
1da177e4 LT |
541 | |
542 | spin_lock_bh(&xfrm_state_gc_lock); | |
12a169e7 | 543 | hlist_add_head(&x->gclist, &xfrm_state_gc_list); |
1da177e4 LT |
544 | spin_unlock_bh(&xfrm_state_gc_lock); |
545 | schedule_work(&xfrm_state_gc_work); | |
546 | } | |
547 | EXPORT_SYMBOL(__xfrm_state_destroy); | |
548 | ||
53bc6b4d | 549 | int __xfrm_state_delete(struct xfrm_state *x) |
1da177e4 | 550 | { |
26b15dad JHS |
551 | int err = -ESRCH; |
552 | ||
1da177e4 LT |
553 | if (x->km.state != XFRM_STATE_DEAD) { |
554 | x->km.state = XFRM_STATE_DEAD; | |
555 | spin_lock(&xfrm_state_lock); | |
12a169e7 | 556 | list_del(&x->km.all); |
8f126e37 | 557 | hlist_del(&x->bydst); |
8f126e37 | 558 | hlist_del(&x->bysrc); |
a47f0ce0 | 559 | if (x->id.spi) |
8f126e37 | 560 | hlist_del(&x->byspi); |
f034b5d4 | 561 | xfrm_state_num--; |
1da177e4 | 562 | spin_unlock(&xfrm_state_lock); |
1da177e4 | 563 | |
1da177e4 LT |
564 | /* All xfrm_state objects are created by xfrm_state_alloc. |
565 | * The xfrm_state_alloc call gives a reference, and that | |
566 | * is what we are dropping here. | |
567 | */ | |
5dba4797 | 568 | xfrm_state_put(x); |
26b15dad | 569 | err = 0; |
1da177e4 | 570 | } |
26b15dad JHS |
571 | |
572 | return err; | |
1da177e4 | 573 | } |
53bc6b4d | 574 | EXPORT_SYMBOL(__xfrm_state_delete); |
1da177e4 | 575 | |
26b15dad | 576 | int xfrm_state_delete(struct xfrm_state *x) |
1da177e4 | 577 | { |
26b15dad JHS |
578 | int err; |
579 | ||
1da177e4 | 580 | spin_lock_bh(&x->lock); |
26b15dad | 581 | err = __xfrm_state_delete(x); |
1da177e4 | 582 | spin_unlock_bh(&x->lock); |
26b15dad JHS |
583 | |
584 | return err; | |
1da177e4 LT |
585 | } |
586 | EXPORT_SYMBOL(xfrm_state_delete); | |
587 | ||
4aa2e62c JL |
588 | #ifdef CONFIG_SECURITY_NETWORK_XFRM |
589 | static inline int | |
590 | xfrm_state_flush_secctx_check(u8 proto, struct xfrm_audit *audit_info) | |
1da177e4 | 591 | { |
4aa2e62c JL |
592 | int i, err = 0; |
593 | ||
594 | for (i = 0; i <= xfrm_state_hmask; i++) { | |
595 | struct hlist_node *entry; | |
596 | struct xfrm_state *x; | |
597 | ||
598 | hlist_for_each_entry(x, entry, xfrm_state_bydst+i, bydst) { | |
599 | if (xfrm_id_proto_match(x->id.proto, proto) && | |
600 | (err = security_xfrm_state_delete(x)) != 0) { | |
ab5f5e8b JL |
601 | xfrm_audit_state_delete(x, 0, |
602 | audit_info->loginuid, | |
2532386f | 603 | audit_info->sessionid, |
ab5f5e8b | 604 | audit_info->secid); |
4aa2e62c JL |
605 | return err; |
606 | } | |
607 | } | |
608 | } | |
609 | ||
610 | return err; | |
611 | } | |
612 | #else | |
613 | static inline int | |
614 | xfrm_state_flush_secctx_check(u8 proto, struct xfrm_audit *audit_info) | |
615 | { | |
616 | return 0; | |
617 | } | |
618 | #endif | |
619 | ||
620 | int xfrm_state_flush(u8 proto, struct xfrm_audit *audit_info) | |
621 | { | |
622 | int i, err = 0; | |
1da177e4 LT |
623 | |
624 | spin_lock_bh(&xfrm_state_lock); | |
4aa2e62c JL |
625 | err = xfrm_state_flush_secctx_check(proto, audit_info); |
626 | if (err) | |
627 | goto out; | |
628 | ||
a9917c06 | 629 | for (i = 0; i <= xfrm_state_hmask; i++) { |
8f126e37 DM |
630 | struct hlist_node *entry; |
631 | struct xfrm_state *x; | |
1da177e4 | 632 | restart: |
8f126e37 | 633 | hlist_for_each_entry(x, entry, xfrm_state_bydst+i, bydst) { |
1da177e4 | 634 | if (!xfrm_state_kern(x) && |
5794708f | 635 | xfrm_id_proto_match(x->id.proto, proto)) { |
1da177e4 LT |
636 | xfrm_state_hold(x); |
637 | spin_unlock_bh(&xfrm_state_lock); | |
638 | ||
161a09e7 | 639 | err = xfrm_state_delete(x); |
ab5f5e8b JL |
640 | xfrm_audit_state_delete(x, err ? 0 : 1, |
641 | audit_info->loginuid, | |
2532386f | 642 | audit_info->sessionid, |
ab5f5e8b | 643 | audit_info->secid); |
1da177e4 LT |
644 | xfrm_state_put(x); |
645 | ||
646 | spin_lock_bh(&xfrm_state_lock); | |
647 | goto restart; | |
648 | } | |
649 | } | |
650 | } | |
4aa2e62c JL |
651 | err = 0; |
652 | ||
653 | out: | |
1da177e4 LT |
654 | spin_unlock_bh(&xfrm_state_lock); |
655 | wake_up(&km_waitq); | |
4aa2e62c | 656 | return err; |
1da177e4 LT |
657 | } |
658 | EXPORT_SYMBOL(xfrm_state_flush); | |
659 | ||
af11e316 | 660 | void xfrm_sad_getinfo(struct xfrmk_sadinfo *si) |
28d8909b JHS |
661 | { |
662 | spin_lock_bh(&xfrm_state_lock); | |
663 | si->sadcnt = xfrm_state_num; | |
664 | si->sadhcnt = xfrm_state_hmask; | |
665 | si->sadhmcnt = xfrm_state_hashmax; | |
666 | spin_unlock_bh(&xfrm_state_lock); | |
667 | } | |
668 | EXPORT_SYMBOL(xfrm_sad_getinfo); | |
669 | ||
1da177e4 LT |
670 | static int |
671 | xfrm_init_tempsel(struct xfrm_state *x, struct flowi *fl, | |
672 | struct xfrm_tmpl *tmpl, | |
673 | xfrm_address_t *daddr, xfrm_address_t *saddr, | |
674 | unsigned short family) | |
675 | { | |
676 | struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); | |
677 | if (!afinfo) | |
678 | return -1; | |
679 | afinfo->init_tempsel(x, fl, tmpl, daddr, saddr); | |
680 | xfrm_state_put_afinfo(afinfo); | |
681 | return 0; | |
682 | } | |
683 | ||
a94cfd19 | 684 | static struct xfrm_state *__xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family) |
edcd5821 DM |
685 | { |
686 | unsigned int h = xfrm_spi_hash(daddr, spi, proto, family); | |
687 | struct xfrm_state *x; | |
8f126e37 | 688 | struct hlist_node *entry; |
edcd5821 | 689 | |
8f126e37 | 690 | hlist_for_each_entry(x, entry, xfrm_state_byspi+h, byspi) { |
edcd5821 DM |
691 | if (x->props.family != family || |
692 | x->id.spi != spi || | |
693 | x->id.proto != proto) | |
694 | continue; | |
695 | ||
696 | switch (family) { | |
697 | case AF_INET: | |
698 | if (x->id.daddr.a4 != daddr->a4) | |
699 | continue; | |
700 | break; | |
701 | case AF_INET6: | |
702 | if (!ipv6_addr_equal((struct in6_addr *)daddr, | |
703 | (struct in6_addr *) | |
704 | x->id.daddr.a6)) | |
705 | continue; | |
706 | break; | |
3ff50b79 | 707 | } |
edcd5821 DM |
708 | |
709 | xfrm_state_hold(x); | |
710 | return x; | |
711 | } | |
712 | ||
713 | return NULL; | |
714 | } | |
715 | ||
716 | static struct xfrm_state *__xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family) | |
717 | { | |
667bbcb6 | 718 | unsigned int h = xfrm_src_hash(daddr, saddr, family); |
edcd5821 | 719 | struct xfrm_state *x; |
8f126e37 | 720 | struct hlist_node *entry; |
edcd5821 | 721 | |
8f126e37 | 722 | hlist_for_each_entry(x, entry, xfrm_state_bysrc+h, bysrc) { |
edcd5821 DM |
723 | if (x->props.family != family || |
724 | x->id.proto != proto) | |
725 | continue; | |
726 | ||
727 | switch (family) { | |
728 | case AF_INET: | |
729 | if (x->id.daddr.a4 != daddr->a4 || | |
730 | x->props.saddr.a4 != saddr->a4) | |
731 | continue; | |
732 | break; | |
733 | case AF_INET6: | |
734 | if (!ipv6_addr_equal((struct in6_addr *)daddr, | |
735 | (struct in6_addr *) | |
736 | x->id.daddr.a6) || | |
737 | !ipv6_addr_equal((struct in6_addr *)saddr, | |
738 | (struct in6_addr *) | |
739 | x->props.saddr.a6)) | |
740 | continue; | |
741 | break; | |
3ff50b79 | 742 | } |
edcd5821 DM |
743 | |
744 | xfrm_state_hold(x); | |
745 | return x; | |
746 | } | |
747 | ||
748 | return NULL; | |
749 | } | |
750 | ||
751 | static inline struct xfrm_state * | |
752 | __xfrm_state_locate(struct xfrm_state *x, int use_spi, int family) | |
753 | { | |
754 | if (use_spi) | |
755 | return __xfrm_state_lookup(&x->id.daddr, x->id.spi, | |
756 | x->id.proto, family); | |
757 | else | |
758 | return __xfrm_state_lookup_byaddr(&x->id.daddr, | |
759 | &x->props.saddr, | |
760 | x->id.proto, family); | |
761 | } | |
762 | ||
2fab22f2 PM |
763 | static void xfrm_hash_grow_check(int have_hash_collision) |
764 | { | |
765 | if (have_hash_collision && | |
766 | (xfrm_state_hmask + 1) < xfrm_state_hashmax && | |
767 | xfrm_state_num > xfrm_state_hmask) | |
768 | schedule_work(&xfrm_hash_work); | |
769 | } | |
770 | ||
1da177e4 | 771 | struct xfrm_state * |
a716c119 | 772 | xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr, |
1da177e4 LT |
773 | struct flowi *fl, struct xfrm_tmpl *tmpl, |
774 | struct xfrm_policy *pol, int *err, | |
775 | unsigned short family) | |
776 | { | |
4bda4f25 | 777 | unsigned int h; |
8f126e37 | 778 | struct hlist_node *entry; |
37b08e34 | 779 | struct xfrm_state *x, *x0, *to_put; |
1da177e4 LT |
780 | int acquire_in_progress = 0; |
781 | int error = 0; | |
782 | struct xfrm_state *best = NULL; | |
a716c119 | 783 | |
37b08e34 DM |
784 | to_put = NULL; |
785 | ||
1da177e4 | 786 | spin_lock_bh(&xfrm_state_lock); |
4bda4f25 | 787 | h = xfrm_dst_hash(daddr, saddr, tmpl->reqid, family); |
8f126e37 | 788 | hlist_for_each_entry(x, entry, xfrm_state_bydst+h, bydst) { |
1da177e4 LT |
789 | if (x->props.family == family && |
790 | x->props.reqid == tmpl->reqid && | |
fbd9a5b4 | 791 | !(x->props.flags & XFRM_STATE_WILDRECV) && |
1da177e4 LT |
792 | xfrm_state_addr_check(x, daddr, saddr, family) && |
793 | tmpl->mode == x->props.mode && | |
794 | tmpl->id.proto == x->id.proto && | |
795 | (tmpl->id.spi == x->id.spi || !tmpl->id.spi)) { | |
796 | /* Resolution logic: | |
797 | 1. There is a valid state with matching selector. | |
798 | Done. | |
799 | 2. Valid state with inappropriate selector. Skip. | |
800 | ||
801 | Entering area of "sysdeps". | |
802 | ||
803 | 3. If state is not valid, selector is temporary, | |
804 | it selects only session which triggered | |
805 | previous resolution. Key manager will do | |
806 | something to install a state with proper | |
807 | selector. | |
808 | */ | |
809 | if (x->km.state == XFRM_STATE_VALID) { | |
df9dcb45 | 810 | if ((x->sel.family && !xfrm_selector_match(&x->sel, fl, x->sel.family)) || |
e0d1caa7 | 811 | !security_xfrm_state_pol_flow_match(x, pol, fl)) |
1da177e4 LT |
812 | continue; |
813 | if (!best || | |
814 | best->km.dying > x->km.dying || | |
815 | (best->km.dying == x->km.dying && | |
816 | best->curlft.add_time < x->curlft.add_time)) | |
817 | best = x; | |
818 | } else if (x->km.state == XFRM_STATE_ACQ) { | |
819 | acquire_in_progress = 1; | |
820 | } else if (x->km.state == XFRM_STATE_ERROR || | |
821 | x->km.state == XFRM_STATE_EXPIRED) { | |
48b8d783 | 822 | if (xfrm_selector_match(&x->sel, fl, x->sel.family) && |
e0d1caa7 | 823 | security_xfrm_state_pol_flow_match(x, pol, fl)) |
1da177e4 LT |
824 | error = -ESRCH; |
825 | } | |
826 | } | |
827 | } | |
828 | ||
829 | x = best; | |
830 | if (!x && !error && !acquire_in_progress) { | |
5c5d281a | 831 | if (tmpl->id.spi && |
edcd5821 DM |
832 | (x0 = __xfrm_state_lookup(daddr, tmpl->id.spi, |
833 | tmpl->id.proto, family)) != NULL) { | |
37b08e34 | 834 | to_put = x0; |
1da177e4 LT |
835 | error = -EEXIST; |
836 | goto out; | |
837 | } | |
838 | x = xfrm_state_alloc(); | |
839 | if (x == NULL) { | |
840 | error = -ENOMEM; | |
841 | goto out; | |
842 | } | |
843 | /* Initialize temporary selector matching only | |
844 | * to current session. */ | |
845 | xfrm_init_tempsel(x, fl, tmpl, daddr, saddr, family); | |
846 | ||
e0d1caa7 VY |
847 | error = security_xfrm_state_alloc_acquire(x, pol->security, fl->secid); |
848 | if (error) { | |
849 | x->km.state = XFRM_STATE_DEAD; | |
37b08e34 | 850 | to_put = x; |
e0d1caa7 VY |
851 | x = NULL; |
852 | goto out; | |
853 | } | |
854 | ||
1da177e4 LT |
855 | if (km_query(x, tmpl, pol) == 0) { |
856 | x->km.state = XFRM_STATE_ACQ; | |
12a169e7 | 857 | list_add(&x->km.all, &xfrm_state_all); |
8f126e37 | 858 | hlist_add_head(&x->bydst, xfrm_state_bydst+h); |
667bbcb6 | 859 | h = xfrm_src_hash(daddr, saddr, family); |
8f126e37 | 860 | hlist_add_head(&x->bysrc, xfrm_state_bysrc+h); |
1da177e4 LT |
861 | if (x->id.spi) { |
862 | h = xfrm_spi_hash(&x->id.daddr, x->id.spi, x->id.proto, family); | |
8f126e37 | 863 | hlist_add_head(&x->byspi, xfrm_state_byspi+h); |
1da177e4 | 864 | } |
01e67d08 DM |
865 | x->lft.hard_add_expires_seconds = sysctl_xfrm_acq_expires; |
866 | x->timer.expires = jiffies + sysctl_xfrm_acq_expires*HZ; | |
1da177e4 | 867 | add_timer(&x->timer); |
2fab22f2 PM |
868 | xfrm_state_num++; |
869 | xfrm_hash_grow_check(x->bydst.next != NULL); | |
1da177e4 LT |
870 | } else { |
871 | x->km.state = XFRM_STATE_DEAD; | |
37b08e34 | 872 | to_put = x; |
1da177e4 LT |
873 | x = NULL; |
874 | error = -ESRCH; | |
875 | } | |
876 | } | |
877 | out: | |
878 | if (x) | |
879 | xfrm_state_hold(x); | |
880 | else | |
881 | *err = acquire_in_progress ? -EAGAIN : error; | |
882 | spin_unlock_bh(&xfrm_state_lock); | |
37b08e34 DM |
883 | if (to_put) |
884 | xfrm_state_put(to_put); | |
1da177e4 LT |
885 | return x; |
886 | } | |
887 | ||
628529b6 JHS |
888 | struct xfrm_state * |
889 | xfrm_stateonly_find(xfrm_address_t *daddr, xfrm_address_t *saddr, | |
890 | unsigned short family, u8 mode, u8 proto, u32 reqid) | |
891 | { | |
4bda4f25 | 892 | unsigned int h; |
628529b6 JHS |
893 | struct xfrm_state *rx = NULL, *x = NULL; |
894 | struct hlist_node *entry; | |
895 | ||
896 | spin_lock(&xfrm_state_lock); | |
4bda4f25 | 897 | h = xfrm_dst_hash(daddr, saddr, reqid, family); |
628529b6 JHS |
898 | hlist_for_each_entry(x, entry, xfrm_state_bydst+h, bydst) { |
899 | if (x->props.family == family && | |
900 | x->props.reqid == reqid && | |
901 | !(x->props.flags & XFRM_STATE_WILDRECV) && | |
902 | xfrm_state_addr_check(x, daddr, saddr, family) && | |
903 | mode == x->props.mode && | |
904 | proto == x->id.proto && | |
905 | x->km.state == XFRM_STATE_VALID) { | |
906 | rx = x; | |
907 | break; | |
908 | } | |
909 | } | |
910 | ||
911 | if (rx) | |
912 | xfrm_state_hold(rx); | |
913 | spin_unlock(&xfrm_state_lock); | |
914 | ||
915 | ||
916 | return rx; | |
917 | } | |
918 | EXPORT_SYMBOL(xfrm_stateonly_find); | |
919 | ||
1da177e4 LT |
920 | static void __xfrm_state_insert(struct xfrm_state *x) |
921 | { | |
a624c108 | 922 | unsigned int h; |
1da177e4 | 923 | |
9d4a706d DM |
924 | x->genid = ++xfrm_state_genid; |
925 | ||
12a169e7 | 926 | list_add(&x->km.all, &xfrm_state_all); |
4c563f76 | 927 | |
c1969f29 DM |
928 | h = xfrm_dst_hash(&x->id.daddr, &x->props.saddr, |
929 | x->props.reqid, x->props.family); | |
8f126e37 | 930 | hlist_add_head(&x->bydst, xfrm_state_bydst+h); |
1da177e4 | 931 | |
667bbcb6 | 932 | h = xfrm_src_hash(&x->id.daddr, &x->props.saddr, x->props.family); |
8f126e37 | 933 | hlist_add_head(&x->bysrc, xfrm_state_bysrc+h); |
1da177e4 | 934 | |
7b4dc360 | 935 | if (x->id.spi) { |
6c44e6b7 MN |
936 | h = xfrm_spi_hash(&x->id.daddr, x->id.spi, x->id.proto, |
937 | x->props.family); | |
938 | ||
8f126e37 | 939 | hlist_add_head(&x->byspi, xfrm_state_byspi+h); |
6c44e6b7 MN |
940 | } |
941 | ||
a47f0ce0 DM |
942 | mod_timer(&x->timer, jiffies + HZ); |
943 | if (x->replay_maxage) | |
944 | mod_timer(&x->rtimer, jiffies + x->replay_maxage); | |
f8cd5488 | 945 | |
1da177e4 | 946 | wake_up(&km_waitq); |
f034b5d4 DM |
947 | |
948 | xfrm_state_num++; | |
949 | ||
918049f0 | 950 | xfrm_hash_grow_check(x->bydst.next != NULL); |
1da177e4 LT |
951 | } |
952 | ||
c7f5ea3a DM |
953 | /* xfrm_state_lock is held */ |
954 | static void __xfrm_state_bump_genids(struct xfrm_state *xnew) | |
955 | { | |
956 | unsigned short family = xnew->props.family; | |
957 | u32 reqid = xnew->props.reqid; | |
958 | struct xfrm_state *x; | |
959 | struct hlist_node *entry; | |
960 | unsigned int h; | |
961 | ||
c1969f29 | 962 | h = xfrm_dst_hash(&xnew->id.daddr, &xnew->props.saddr, reqid, family); |
c7f5ea3a DM |
963 | hlist_for_each_entry(x, entry, xfrm_state_bydst+h, bydst) { |
964 | if (x->props.family == family && | |
965 | x->props.reqid == reqid && | |
c1969f29 DM |
966 | !xfrm_addr_cmp(&x->id.daddr, &xnew->id.daddr, family) && |
967 | !xfrm_addr_cmp(&x->props.saddr, &xnew->props.saddr, family)) | |
c7f5ea3a DM |
968 | x->genid = xfrm_state_genid; |
969 | } | |
970 | } | |
971 | ||
1da177e4 LT |
972 | void xfrm_state_insert(struct xfrm_state *x) |
973 | { | |
974 | spin_lock_bh(&xfrm_state_lock); | |
c7f5ea3a | 975 | __xfrm_state_bump_genids(x); |
1da177e4 LT |
976 | __xfrm_state_insert(x); |
977 | spin_unlock_bh(&xfrm_state_lock); | |
978 | } | |
979 | EXPORT_SYMBOL(xfrm_state_insert); | |
980 | ||
2770834c DM |
981 | /* xfrm_state_lock is held */ |
982 | 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) | |
983 | { | |
c1969f29 | 984 | unsigned int h = xfrm_dst_hash(daddr, saddr, reqid, family); |
8f126e37 | 985 | struct hlist_node *entry; |
2770834c DM |
986 | struct xfrm_state *x; |
987 | ||
8f126e37 | 988 | hlist_for_each_entry(x, entry, xfrm_state_bydst+h, bydst) { |
2770834c DM |
989 | if (x->props.reqid != reqid || |
990 | x->props.mode != mode || | |
991 | x->props.family != family || | |
992 | x->km.state != XFRM_STATE_ACQ || | |
75e252d9 JL |
993 | x->id.spi != 0 || |
994 | x->id.proto != proto) | |
2770834c DM |
995 | continue; |
996 | ||
997 | switch (family) { | |
998 | case AF_INET: | |
999 | if (x->id.daddr.a4 != daddr->a4 || | |
1000 | x->props.saddr.a4 != saddr->a4) | |
1001 | continue; | |
1002 | break; | |
1003 | case AF_INET6: | |
1004 | if (!ipv6_addr_equal((struct in6_addr *)x->id.daddr.a6, | |
1005 | (struct in6_addr *)daddr) || | |
1006 | !ipv6_addr_equal((struct in6_addr *) | |
1007 | x->props.saddr.a6, | |
1008 | (struct in6_addr *)saddr)) | |
1009 | continue; | |
1010 | break; | |
3ff50b79 | 1011 | } |
2770834c DM |
1012 | |
1013 | xfrm_state_hold(x); | |
1014 | return x; | |
1015 | } | |
1016 | ||
1017 | if (!create) | |
1018 | return NULL; | |
1019 | ||
1020 | x = xfrm_state_alloc(); | |
1021 | if (likely(x)) { | |
1022 | switch (family) { | |
1023 | case AF_INET: | |
1024 | x->sel.daddr.a4 = daddr->a4; | |
1025 | x->sel.saddr.a4 = saddr->a4; | |
1026 | x->sel.prefixlen_d = 32; | |
1027 | x->sel.prefixlen_s = 32; | |
1028 | x->props.saddr.a4 = saddr->a4; | |
1029 | x->id.daddr.a4 = daddr->a4; | |
1030 | break; | |
1031 | ||
1032 | case AF_INET6: | |
1033 | ipv6_addr_copy((struct in6_addr *)x->sel.daddr.a6, | |
1034 | (struct in6_addr *)daddr); | |
1035 | ipv6_addr_copy((struct in6_addr *)x->sel.saddr.a6, | |
1036 | (struct in6_addr *)saddr); | |
1037 | x->sel.prefixlen_d = 128; | |
1038 | x->sel.prefixlen_s = 128; | |
1039 | ipv6_addr_copy((struct in6_addr *)x->props.saddr.a6, | |
1040 | (struct in6_addr *)saddr); | |
1041 | ipv6_addr_copy((struct in6_addr *)x->id.daddr.a6, | |
1042 | (struct in6_addr *)daddr); | |
1043 | break; | |
3ff50b79 | 1044 | } |
2770834c DM |
1045 | |
1046 | x->km.state = XFRM_STATE_ACQ; | |
1047 | x->id.proto = proto; | |
1048 | x->props.family = family; | |
1049 | x->props.mode = mode; | |
1050 | x->props.reqid = reqid; | |
01e67d08 | 1051 | x->lft.hard_add_expires_seconds = sysctl_xfrm_acq_expires; |
2770834c | 1052 | xfrm_state_hold(x); |
01e67d08 | 1053 | x->timer.expires = jiffies + sysctl_xfrm_acq_expires*HZ; |
2770834c | 1054 | add_timer(&x->timer); |
12a169e7 | 1055 | list_add(&x->km.all, &xfrm_state_all); |
8f126e37 | 1056 | hlist_add_head(&x->bydst, xfrm_state_bydst+h); |
667bbcb6 | 1057 | h = xfrm_src_hash(daddr, saddr, family); |
8f126e37 | 1058 | hlist_add_head(&x->bysrc, xfrm_state_bysrc+h); |
918049f0 DM |
1059 | |
1060 | xfrm_state_num++; | |
1061 | ||
1062 | xfrm_hash_grow_check(x->bydst.next != NULL); | |
2770834c DM |
1063 | } |
1064 | ||
1065 | return x; | |
1066 | } | |
1067 | ||
1da177e4 LT |
1068 | static struct xfrm_state *__xfrm_find_acq_byseq(u32 seq); |
1069 | ||
1070 | int xfrm_state_add(struct xfrm_state *x) | |
1071 | { | |
37b08e34 | 1072 | struct xfrm_state *x1, *to_put; |
1da177e4 LT |
1073 | int family; |
1074 | int err; | |
eb2971b6 | 1075 | int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY); |
1da177e4 LT |
1076 | |
1077 | family = x->props.family; | |
1da177e4 | 1078 | |
37b08e34 DM |
1079 | to_put = NULL; |
1080 | ||
1da177e4 LT |
1081 | spin_lock_bh(&xfrm_state_lock); |
1082 | ||
edcd5821 | 1083 | x1 = __xfrm_state_locate(x, use_spi, family); |
1da177e4 | 1084 | if (x1) { |
37b08e34 | 1085 | to_put = x1; |
1da177e4 LT |
1086 | x1 = NULL; |
1087 | err = -EEXIST; | |
1088 | goto out; | |
1089 | } | |
1090 | ||
eb2971b6 | 1091 | if (use_spi && x->km.seq) { |
1da177e4 | 1092 | x1 = __xfrm_find_acq_byseq(x->km.seq); |
75e252d9 JL |
1093 | if (x1 && ((x1->id.proto != x->id.proto) || |
1094 | xfrm_addr_cmp(&x1->id.daddr, &x->id.daddr, family))) { | |
37b08e34 | 1095 | to_put = x1; |
1da177e4 LT |
1096 | x1 = NULL; |
1097 | } | |
1098 | } | |
1099 | ||
eb2971b6 | 1100 | if (use_spi && !x1) |
2770834c DM |
1101 | x1 = __find_acq_core(family, x->props.mode, x->props.reqid, |
1102 | x->id.proto, | |
1103 | &x->id.daddr, &x->props.saddr, 0); | |
1da177e4 | 1104 | |
c7f5ea3a | 1105 | __xfrm_state_bump_genids(x); |
1da177e4 LT |
1106 | __xfrm_state_insert(x); |
1107 | err = 0; | |
1108 | ||
1109 | out: | |
1110 | spin_unlock_bh(&xfrm_state_lock); | |
1da177e4 LT |
1111 | |
1112 | if (x1) { | |
1113 | xfrm_state_delete(x1); | |
1114 | xfrm_state_put(x1); | |
1115 | } | |
1116 | ||
37b08e34 DM |
1117 | if (to_put) |
1118 | xfrm_state_put(to_put); | |
1119 | ||
1da177e4 LT |
1120 | return err; |
1121 | } | |
1122 | EXPORT_SYMBOL(xfrm_state_add); | |
1123 | ||
80c9abaa | 1124 | #ifdef CONFIG_XFRM_MIGRATE |
6666351d | 1125 | static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig, int *errp) |
80c9abaa SS |
1126 | { |
1127 | int err = -ENOMEM; | |
1128 | struct xfrm_state *x = xfrm_state_alloc(); | |
1129 | if (!x) | |
1130 | goto error; | |
1131 | ||
1132 | memcpy(&x->id, &orig->id, sizeof(x->id)); | |
1133 | memcpy(&x->sel, &orig->sel, sizeof(x->sel)); | |
1134 | memcpy(&x->lft, &orig->lft, sizeof(x->lft)); | |
1135 | x->props.mode = orig->props.mode; | |
1136 | x->props.replay_window = orig->props.replay_window; | |
1137 | x->props.reqid = orig->props.reqid; | |
1138 | x->props.family = orig->props.family; | |
1139 | x->props.saddr = orig->props.saddr; | |
1140 | ||
1141 | if (orig->aalg) { | |
1142 | x->aalg = xfrm_algo_clone(orig->aalg); | |
1143 | if (!x->aalg) | |
1144 | goto error; | |
1145 | } | |
1146 | x->props.aalgo = orig->props.aalgo; | |
1147 | ||
1148 | if (orig->ealg) { | |
1149 | x->ealg = xfrm_algo_clone(orig->ealg); | |
1150 | if (!x->ealg) | |
1151 | goto error; | |
1152 | } | |
1153 | x->props.ealgo = orig->props.ealgo; | |
1154 | ||
1155 | if (orig->calg) { | |
1156 | x->calg = xfrm_algo_clone(orig->calg); | |
1157 | if (!x->calg) | |
1158 | goto error; | |
1159 | } | |
1160 | x->props.calgo = orig->props.calgo; | |
1161 | ||
a716c119 | 1162 | if (orig->encap) { |
80c9abaa SS |
1163 | x->encap = kmemdup(orig->encap, sizeof(*x->encap), GFP_KERNEL); |
1164 | if (!x->encap) | |
1165 | goto error; | |
1166 | } | |
1167 | ||
1168 | if (orig->coaddr) { | |
1169 | x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr), | |
1170 | GFP_KERNEL); | |
1171 | if (!x->coaddr) | |
1172 | goto error; | |
1173 | } | |
1174 | ||
1175 | err = xfrm_init_state(x); | |
1176 | if (err) | |
1177 | goto error; | |
1178 | ||
1179 | x->props.flags = orig->props.flags; | |
1180 | ||
1181 | x->curlft.add_time = orig->curlft.add_time; | |
1182 | x->km.state = orig->km.state; | |
1183 | x->km.seq = orig->km.seq; | |
1184 | ||
1185 | return x; | |
1186 | ||
1187 | error: | |
1188 | if (errp) | |
1189 | *errp = err; | |
1190 | if (x) { | |
1191 | kfree(x->aalg); | |
1192 | kfree(x->ealg); | |
1193 | kfree(x->calg); | |
1194 | kfree(x->encap); | |
1195 | kfree(x->coaddr); | |
1196 | } | |
1197 | kfree(x); | |
1198 | return NULL; | |
1199 | } | |
80c9abaa SS |
1200 | |
1201 | /* xfrm_state_lock is held */ | |
1202 | struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m) | |
1203 | { | |
1204 | unsigned int h; | |
1205 | struct xfrm_state *x; | |
1206 | struct hlist_node *entry; | |
1207 | ||
1208 | if (m->reqid) { | |
1209 | h = xfrm_dst_hash(&m->old_daddr, &m->old_saddr, | |
1210 | m->reqid, m->old_family); | |
1211 | hlist_for_each_entry(x, entry, xfrm_state_bydst+h, bydst) { | |
1212 | if (x->props.mode != m->mode || | |
1213 | x->id.proto != m->proto) | |
1214 | continue; | |
1215 | if (m->reqid && x->props.reqid != m->reqid) | |
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 | } else { | |
1226 | h = xfrm_src_hash(&m->old_daddr, &m->old_saddr, | |
1227 | m->old_family); | |
1228 | hlist_for_each_entry(x, entry, xfrm_state_bysrc+h, bysrc) { | |
1229 | if (x->props.mode != m->mode || | |
1230 | x->id.proto != m->proto) | |
1231 | continue; | |
1232 | if (xfrm_addr_cmp(&x->id.daddr, &m->old_daddr, | |
1233 | m->old_family) || | |
1234 | xfrm_addr_cmp(&x->props.saddr, &m->old_saddr, | |
1235 | m->old_family)) | |
1236 | continue; | |
1237 | xfrm_state_hold(x); | |
1238 | return x; | |
1239 | } | |
1240 | } | |
1241 | ||
a716c119 | 1242 | return NULL; |
80c9abaa SS |
1243 | } |
1244 | EXPORT_SYMBOL(xfrm_migrate_state_find); | |
1245 | ||
1246 | struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x, | |
1247 | struct xfrm_migrate *m) | |
1248 | { | |
1249 | struct xfrm_state *xc; | |
1250 | int err; | |
1251 | ||
1252 | xc = xfrm_state_clone(x, &err); | |
1253 | if (!xc) | |
1254 | return NULL; | |
1255 | ||
1256 | memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr)); | |
1257 | memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr)); | |
1258 | ||
1259 | /* add state */ | |
1260 | if (!xfrm_addr_cmp(&x->id.daddr, &m->new_daddr, m->new_family)) { | |
1261 | /* a care is needed when the destination address of the | |
1262 | state is to be updated as it is a part of triplet */ | |
1263 | xfrm_state_insert(xc); | |
1264 | } else { | |
1265 | if ((err = xfrm_state_add(xc)) < 0) | |
1266 | goto error; | |
1267 | } | |
1268 | ||
1269 | return xc; | |
1270 | error: | |
1271 | kfree(xc); | |
1272 | return NULL; | |
1273 | } | |
1274 | EXPORT_SYMBOL(xfrm_state_migrate); | |
1275 | #endif | |
1276 | ||
1da177e4 LT |
1277 | int xfrm_state_update(struct xfrm_state *x) |
1278 | { | |
37b08e34 | 1279 | struct xfrm_state *x1, *to_put; |
1da177e4 | 1280 | int err; |
eb2971b6 | 1281 | int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY); |
1da177e4 | 1282 | |
37b08e34 DM |
1283 | to_put = NULL; |
1284 | ||
1da177e4 | 1285 | spin_lock_bh(&xfrm_state_lock); |
edcd5821 | 1286 | x1 = __xfrm_state_locate(x, use_spi, x->props.family); |
1da177e4 LT |
1287 | |
1288 | err = -ESRCH; | |
1289 | if (!x1) | |
1290 | goto out; | |
1291 | ||
1292 | if (xfrm_state_kern(x1)) { | |
37b08e34 | 1293 | to_put = x1; |
1da177e4 LT |
1294 | err = -EEXIST; |
1295 | goto out; | |
1296 | } | |
1297 | ||
1298 | if (x1->km.state == XFRM_STATE_ACQ) { | |
1299 | __xfrm_state_insert(x); | |
1300 | x = NULL; | |
1301 | } | |
1302 | err = 0; | |
1303 | ||
1304 | out: | |
1305 | spin_unlock_bh(&xfrm_state_lock); | |
1da177e4 | 1306 | |
37b08e34 DM |
1307 | if (to_put) |
1308 | xfrm_state_put(to_put); | |
1309 | ||
1da177e4 LT |
1310 | if (err) |
1311 | return err; | |
1312 | ||
1313 | if (!x) { | |
1314 | xfrm_state_delete(x1); | |
1315 | xfrm_state_put(x1); | |
1316 | return 0; | |
1317 | } | |
1318 | ||
1319 | err = -EINVAL; | |
1320 | spin_lock_bh(&x1->lock); | |
1321 | if (likely(x1->km.state == XFRM_STATE_VALID)) { | |
1322 | if (x->encap && x1->encap) | |
1323 | memcpy(x1->encap, x->encap, sizeof(*x1->encap)); | |
060f02a3 NT |
1324 | if (x->coaddr && x1->coaddr) { |
1325 | memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr)); | |
1326 | } | |
1327 | if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel))) | |
1328 | memcpy(&x1->sel, &x->sel, sizeof(x1->sel)); | |
1da177e4 LT |
1329 | memcpy(&x1->lft, &x->lft, sizeof(x1->lft)); |
1330 | x1->km.dying = 0; | |
1331 | ||
a47f0ce0 | 1332 | mod_timer(&x1->timer, jiffies + HZ); |
1da177e4 LT |
1333 | if (x1->curlft.use_time) |
1334 | xfrm_state_check_expire(x1); | |
1335 | ||
1336 | err = 0; | |
1337 | } | |
1338 | spin_unlock_bh(&x1->lock); | |
1339 | ||
1340 | xfrm_state_put(x1); | |
1341 | ||
1342 | return err; | |
1343 | } | |
1344 | EXPORT_SYMBOL(xfrm_state_update); | |
1345 | ||
1346 | int xfrm_state_check_expire(struct xfrm_state *x) | |
1347 | { | |
1348 | if (!x->curlft.use_time) | |
9d729f72 | 1349 | x->curlft.use_time = get_seconds(); |
1da177e4 LT |
1350 | |
1351 | if (x->km.state != XFRM_STATE_VALID) | |
1352 | return -EINVAL; | |
1353 | ||
1354 | if (x->curlft.bytes >= x->lft.hard_byte_limit || | |
1355 | x->curlft.packets >= x->lft.hard_packet_limit) { | |
4666faab | 1356 | x->km.state = XFRM_STATE_EXPIRED; |
a47f0ce0 | 1357 | mod_timer(&x->timer, jiffies); |
1da177e4 LT |
1358 | return -EINVAL; |
1359 | } | |
1360 | ||
1361 | if (!x->km.dying && | |
1362 | (x->curlft.bytes >= x->lft.soft_byte_limit || | |
4666faab HX |
1363 | x->curlft.packets >= x->lft.soft_packet_limit)) { |
1364 | x->km.dying = 1; | |
53bc6b4d | 1365 | km_state_expired(x, 0, 0); |
4666faab | 1366 | } |
1da177e4 LT |
1367 | return 0; |
1368 | } | |
1369 | EXPORT_SYMBOL(xfrm_state_check_expire); | |
1370 | ||
1da177e4 | 1371 | struct xfrm_state * |
a94cfd19 | 1372 | xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, |
1da177e4 LT |
1373 | unsigned short family) |
1374 | { | |
1375 | struct xfrm_state *x; | |
1da177e4 LT |
1376 | |
1377 | spin_lock_bh(&xfrm_state_lock); | |
edcd5821 | 1378 | x = __xfrm_state_lookup(daddr, spi, proto, family); |
1da177e4 | 1379 | spin_unlock_bh(&xfrm_state_lock); |
1da177e4 LT |
1380 | return x; |
1381 | } | |
1382 | EXPORT_SYMBOL(xfrm_state_lookup); | |
1383 | ||
1384 | struct xfrm_state * | |
eb2971b6 MN |
1385 | xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, |
1386 | u8 proto, unsigned short family) | |
1387 | { | |
1388 | struct xfrm_state *x; | |
eb2971b6 MN |
1389 | |
1390 | spin_lock_bh(&xfrm_state_lock); | |
edcd5821 | 1391 | x = __xfrm_state_lookup_byaddr(daddr, saddr, proto, family); |
eb2971b6 | 1392 | spin_unlock_bh(&xfrm_state_lock); |
eb2971b6 MN |
1393 | return x; |
1394 | } | |
1395 | EXPORT_SYMBOL(xfrm_state_lookup_byaddr); | |
1396 | ||
1397 | struct xfrm_state * | |
a716c119 YH |
1398 | xfrm_find_acq(u8 mode, u32 reqid, u8 proto, |
1399 | xfrm_address_t *daddr, xfrm_address_t *saddr, | |
1da177e4 LT |
1400 | int create, unsigned short family) |
1401 | { | |
1402 | struct xfrm_state *x; | |
1da177e4 LT |
1403 | |
1404 | spin_lock_bh(&xfrm_state_lock); | |
2770834c | 1405 | x = __find_acq_core(family, mode, reqid, proto, daddr, saddr, create); |
1da177e4 | 1406 | spin_unlock_bh(&xfrm_state_lock); |
2770834c | 1407 | |
1da177e4 LT |
1408 | return x; |
1409 | } | |
1410 | EXPORT_SYMBOL(xfrm_find_acq); | |
1411 | ||
41a49cc3 MN |
1412 | #ifdef CONFIG_XFRM_SUB_POLICY |
1413 | int | |
1414 | xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n, | |
1415 | unsigned short family) | |
1416 | { | |
1417 | int err = 0; | |
1418 | struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); | |
1419 | if (!afinfo) | |
1420 | return -EAFNOSUPPORT; | |
1421 | ||
1422 | spin_lock_bh(&xfrm_state_lock); | |
1423 | if (afinfo->tmpl_sort) | |
1424 | err = afinfo->tmpl_sort(dst, src, n); | |
1425 | spin_unlock_bh(&xfrm_state_lock); | |
1426 | xfrm_state_put_afinfo(afinfo); | |
1427 | return err; | |
1428 | } | |
1429 | EXPORT_SYMBOL(xfrm_tmpl_sort); | |
1430 | ||
1431 | int | |
1432 | xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n, | |
1433 | unsigned short family) | |
1434 | { | |
1435 | int err = 0; | |
1436 | struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); | |
1437 | if (!afinfo) | |
1438 | return -EAFNOSUPPORT; | |
1439 | ||
1440 | spin_lock_bh(&xfrm_state_lock); | |
1441 | if (afinfo->state_sort) | |
1442 | err = afinfo->state_sort(dst, src, n); | |
1443 | spin_unlock_bh(&xfrm_state_lock); | |
1444 | xfrm_state_put_afinfo(afinfo); | |
1445 | return err; | |
1446 | } | |
1447 | EXPORT_SYMBOL(xfrm_state_sort); | |
1448 | #endif | |
1449 | ||
1da177e4 LT |
1450 | /* Silly enough, but I'm lazy to build resolution list */ |
1451 | ||
1452 | static struct xfrm_state *__xfrm_find_acq_byseq(u32 seq) | |
1453 | { | |
1454 | int i; | |
1da177e4 | 1455 | |
f034b5d4 | 1456 | for (i = 0; i <= xfrm_state_hmask; i++) { |
8f126e37 DM |
1457 | struct hlist_node *entry; |
1458 | struct xfrm_state *x; | |
1459 | ||
1460 | hlist_for_each_entry(x, entry, xfrm_state_bydst+i, bydst) { | |
1461 | if (x->km.seq == seq && | |
1462 | x->km.state == XFRM_STATE_ACQ) { | |
1da177e4 LT |
1463 | xfrm_state_hold(x); |
1464 | return x; | |
1465 | } | |
1466 | } | |
1467 | } | |
1468 | return NULL; | |
1469 | } | |
1470 | ||
1471 | struct xfrm_state *xfrm_find_acq_byseq(u32 seq) | |
1472 | { | |
1473 | struct xfrm_state *x; | |
1474 | ||
1475 | spin_lock_bh(&xfrm_state_lock); | |
1476 | x = __xfrm_find_acq_byseq(seq); | |
1477 | spin_unlock_bh(&xfrm_state_lock); | |
1478 | return x; | |
1479 | } | |
1480 | EXPORT_SYMBOL(xfrm_find_acq_byseq); | |
1481 | ||
1482 | u32 xfrm_get_acqseq(void) | |
1483 | { | |
1484 | u32 res; | |
1485 | static u32 acqseq; | |
1486 | static DEFINE_SPINLOCK(acqseq_lock); | |
1487 | ||
1488 | spin_lock_bh(&acqseq_lock); | |
1489 | res = (++acqseq ? : ++acqseq); | |
1490 | spin_unlock_bh(&acqseq_lock); | |
1491 | return res; | |
1492 | } | |
1493 | EXPORT_SYMBOL(xfrm_get_acqseq); | |
1494 | ||
658b219e | 1495 | int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high) |
1da177e4 | 1496 | { |
f034b5d4 | 1497 | unsigned int h; |
1da177e4 | 1498 | struct xfrm_state *x0; |
658b219e HX |
1499 | int err = -ENOENT; |
1500 | __be32 minspi = htonl(low); | |
1501 | __be32 maxspi = htonl(high); | |
1da177e4 | 1502 | |
658b219e HX |
1503 | spin_lock_bh(&x->lock); |
1504 | if (x->km.state == XFRM_STATE_DEAD) | |
1505 | goto unlock; | |
1506 | ||
1507 | err = 0; | |
1da177e4 | 1508 | if (x->id.spi) |
658b219e HX |
1509 | goto unlock; |
1510 | ||
1511 | err = -ENOENT; | |
1da177e4 LT |
1512 | |
1513 | if (minspi == maxspi) { | |
1514 | x0 = xfrm_state_lookup(&x->id.daddr, minspi, x->id.proto, x->props.family); | |
1515 | if (x0) { | |
1516 | xfrm_state_put(x0); | |
658b219e | 1517 | goto unlock; |
1da177e4 LT |
1518 | } |
1519 | x->id.spi = minspi; | |
1520 | } else { | |
1521 | u32 spi = 0; | |
26977b4e AV |
1522 | for (h=0; h<high-low+1; h++) { |
1523 | spi = low + net_random()%(high-low+1); | |
1da177e4 LT |
1524 | x0 = xfrm_state_lookup(&x->id.daddr, htonl(spi), x->id.proto, x->props.family); |
1525 | if (x0 == NULL) { | |
1526 | x->id.spi = htonl(spi); | |
1527 | break; | |
1528 | } | |
1529 | xfrm_state_put(x0); | |
1530 | } | |
1531 | } | |
1532 | if (x->id.spi) { | |
1533 | spin_lock_bh(&xfrm_state_lock); | |
1534 | h = xfrm_spi_hash(&x->id.daddr, x->id.spi, x->id.proto, x->props.family); | |
8f126e37 | 1535 | hlist_add_head(&x->byspi, xfrm_state_byspi+h); |
1da177e4 | 1536 | spin_unlock_bh(&xfrm_state_lock); |
658b219e HX |
1537 | |
1538 | err = 0; | |
1da177e4 | 1539 | } |
658b219e HX |
1540 | |
1541 | unlock: | |
1542 | spin_unlock_bh(&x->lock); | |
1543 | ||
1544 | return err; | |
1da177e4 LT |
1545 | } |
1546 | EXPORT_SYMBOL(xfrm_alloc_spi); | |
1547 | ||
4c563f76 TT |
1548 | int xfrm_state_walk(struct xfrm_state_walk *walk, |
1549 | int (*func)(struct xfrm_state *, int, void*), | |
1da177e4 LT |
1550 | void *data) |
1551 | { | |
12a169e7 HX |
1552 | struct xfrm_state *state; |
1553 | struct xfrm_state_walk *x; | |
1da177e4 LT |
1554 | int err = 0; |
1555 | ||
12a169e7 | 1556 | if (walk->seq != 0 && list_empty(&walk->all)) |
4c563f76 TT |
1557 | return 0; |
1558 | ||
1da177e4 | 1559 | spin_lock_bh(&xfrm_state_lock); |
12a169e7 HX |
1560 | if (list_empty(&walk->all)) |
1561 | x = list_first_entry(&xfrm_state_all, struct xfrm_state_walk, all); | |
1562 | else | |
1563 | x = list_entry(&walk->all, struct xfrm_state_walk, all); | |
4c563f76 | 1564 | list_for_each_entry_from(x, &xfrm_state_all, all) { |
12a169e7 | 1565 | if (x->state == XFRM_STATE_DEAD) |
4c563f76 | 1566 | continue; |
12a169e7 HX |
1567 | state = container_of(x, struct xfrm_state, km); |
1568 | if (!xfrm_id_proto_match(state->id.proto, walk->proto)) | |
4c563f76 | 1569 | continue; |
12a169e7 HX |
1570 | err = func(state, walk->seq, data); |
1571 | if (err) { | |
1572 | list_move_tail(&walk->all, &x->all); | |
1573 | goto out; | |
1da177e4 | 1574 | } |
12a169e7 | 1575 | walk->seq++; |
1da177e4 | 1576 | } |
12a169e7 | 1577 | if (walk->seq == 0) { |
1da177e4 LT |
1578 | err = -ENOENT; |
1579 | goto out; | |
1580 | } | |
12a169e7 | 1581 | list_del_init(&walk->all); |
1da177e4 LT |
1582 | out: |
1583 | spin_unlock_bh(&xfrm_state_lock); | |
1584 | return err; | |
1585 | } | |
1586 | EXPORT_SYMBOL(xfrm_state_walk); | |
1587 | ||
5c182458 HX |
1588 | void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto) |
1589 | { | |
12a169e7 | 1590 | INIT_LIST_HEAD(&walk->all); |
5c182458 | 1591 | walk->proto = proto; |
12a169e7 HX |
1592 | walk->state = XFRM_STATE_DEAD; |
1593 | walk->seq = 0; | |
5c182458 HX |
1594 | } |
1595 | EXPORT_SYMBOL(xfrm_state_walk_init); | |
1596 | ||
abb81c4f HX |
1597 | void xfrm_state_walk_done(struct xfrm_state_walk *walk) |
1598 | { | |
12a169e7 | 1599 | if (list_empty(&walk->all)) |
5c182458 | 1600 | return; |
5c182458 | 1601 | |
12a169e7 HX |
1602 | spin_lock_bh(&xfrm_state_lock); |
1603 | list_del(&walk->all); | |
1604 | spin_lock_bh(&xfrm_state_lock); | |
abb81c4f HX |
1605 | } |
1606 | EXPORT_SYMBOL(xfrm_state_walk_done); | |
1607 | ||
f8cd5488 JHS |
1608 | |
1609 | void xfrm_replay_notify(struct xfrm_state *x, int event) | |
1610 | { | |
1611 | struct km_event c; | |
1612 | /* we send notify messages in case | |
1613 | * 1. we updated on of the sequence numbers, and the seqno difference | |
1614 | * is at least x->replay_maxdiff, in this case we also update the | |
1615 | * timeout of our timer function | |
1616 | * 2. if x->replay_maxage has elapsed since last update, | |
1617 | * and there were changes | |
1618 | * | |
1619 | * The state structure must be locked! | |
1620 | */ | |
1621 | ||
1622 | switch (event) { | |
1623 | case XFRM_REPLAY_UPDATE: | |
1624 | if (x->replay_maxdiff && | |
1625 | (x->replay.seq - x->preplay.seq < x->replay_maxdiff) && | |
2717096a JHS |
1626 | (x->replay.oseq - x->preplay.oseq < x->replay_maxdiff)) { |
1627 | if (x->xflags & XFRM_TIME_DEFER) | |
1628 | event = XFRM_REPLAY_TIMEOUT; | |
1629 | else | |
1630 | return; | |
1631 | } | |
f8cd5488 JHS |
1632 | |
1633 | break; | |
1634 | ||
1635 | case XFRM_REPLAY_TIMEOUT: | |
1636 | if ((x->replay.seq == x->preplay.seq) && | |
1637 | (x->replay.bitmap == x->preplay.bitmap) && | |
2717096a JHS |
1638 | (x->replay.oseq == x->preplay.oseq)) { |
1639 | x->xflags |= XFRM_TIME_DEFER; | |
f8cd5488 | 1640 | return; |
2717096a | 1641 | } |
f8cd5488 JHS |
1642 | |
1643 | break; | |
1644 | } | |
1645 | ||
1646 | memcpy(&x->preplay, &x->replay, sizeof(struct xfrm_replay_state)); | |
1647 | c.event = XFRM_MSG_NEWAE; | |
1648 | c.data.aevent = event; | |
1649 | km_state_notify(x, &c); | |
1650 | ||
f8cd5488 | 1651 | if (x->replay_maxage && |
a47f0ce0 | 1652 | !mod_timer(&x->rtimer, jiffies + x->replay_maxage)) |
2717096a | 1653 | x->xflags &= ~XFRM_TIME_DEFER; |
f8cd5488 JHS |
1654 | } |
1655 | ||
1656 | static void xfrm_replay_timer_handler(unsigned long data) | |
1657 | { | |
1658 | struct xfrm_state *x = (struct xfrm_state*)data; | |
1659 | ||
1660 | spin_lock(&x->lock); | |
1661 | ||
2717096a JHS |
1662 | if (x->km.state == XFRM_STATE_VALID) { |
1663 | if (xfrm_aevent_is_on()) | |
1664 | xfrm_replay_notify(x, XFRM_REPLAY_TIMEOUT); | |
1665 | else | |
1666 | x->xflags |= XFRM_TIME_DEFER; | |
1667 | } | |
f8cd5488 JHS |
1668 | |
1669 | spin_unlock(&x->lock); | |
1670 | } | |
1671 | ||
afeb14b4 PM |
1672 | int xfrm_replay_check(struct xfrm_state *x, |
1673 | struct sk_buff *skb, __be32 net_seq) | |
1da177e4 LT |
1674 | { |
1675 | u32 diff; | |
a252cc23 | 1676 | u32 seq = ntohl(net_seq); |
1da177e4 LT |
1677 | |
1678 | if (unlikely(seq == 0)) | |
afeb14b4 | 1679 | goto err; |
1da177e4 LT |
1680 | |
1681 | if (likely(seq > x->replay.seq)) | |
1682 | return 0; | |
1683 | ||
1684 | diff = x->replay.seq - seq; | |
4c4d51a7 HX |
1685 | if (diff >= min_t(unsigned int, x->props.replay_window, |
1686 | sizeof(x->replay.bitmap) * 8)) { | |
1da177e4 | 1687 | x->stats.replay_window++; |
afeb14b4 | 1688 | goto err; |
1da177e4 LT |
1689 | } |
1690 | ||
1691 | if (x->replay.bitmap & (1U << diff)) { | |
1692 | x->stats.replay++; | |
afeb14b4 | 1693 | goto err; |
1da177e4 LT |
1694 | } |
1695 | return 0; | |
afeb14b4 PM |
1696 | |
1697 | err: | |
1698 | xfrm_audit_state_replay(x, skb, net_seq); | |
1699 | return -EINVAL; | |
1da177e4 | 1700 | } |
1da177e4 | 1701 | |
61f4627b | 1702 | void xfrm_replay_advance(struct xfrm_state *x, __be32 net_seq) |
1da177e4 LT |
1703 | { |
1704 | u32 diff; | |
61f4627b | 1705 | u32 seq = ntohl(net_seq); |
1da177e4 LT |
1706 | |
1707 | if (seq > x->replay.seq) { | |
1708 | diff = seq - x->replay.seq; | |
1709 | if (diff < x->props.replay_window) | |
1710 | x->replay.bitmap = ((x->replay.bitmap) << diff) | 1; | |
1711 | else | |
1712 | x->replay.bitmap = 1; | |
1713 | x->replay.seq = seq; | |
1714 | } else { | |
1715 | diff = x->replay.seq - seq; | |
1716 | x->replay.bitmap |= (1U << diff); | |
1717 | } | |
f8cd5488 JHS |
1718 | |
1719 | if (xfrm_aevent_is_on()) | |
1720 | xfrm_replay_notify(x, XFRM_REPLAY_UPDATE); | |
1da177e4 | 1721 | } |
1da177e4 | 1722 | |
df01812e | 1723 | static LIST_HEAD(xfrm_km_list); |
1da177e4 LT |
1724 | static DEFINE_RWLOCK(xfrm_km_lock); |
1725 | ||
26b15dad | 1726 | void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c) |
1da177e4 LT |
1727 | { |
1728 | struct xfrm_mgr *km; | |
1729 | ||
26b15dad JHS |
1730 | read_lock(&xfrm_km_lock); |
1731 | list_for_each_entry(km, &xfrm_km_list, list) | |
1732 | if (km->notify_policy) | |
1733 | km->notify_policy(xp, dir, c); | |
1734 | read_unlock(&xfrm_km_lock); | |
1735 | } | |
1da177e4 | 1736 | |
26b15dad JHS |
1737 | void km_state_notify(struct xfrm_state *x, struct km_event *c) |
1738 | { | |
1739 | struct xfrm_mgr *km; | |
1da177e4 LT |
1740 | read_lock(&xfrm_km_lock); |
1741 | list_for_each_entry(km, &xfrm_km_list, list) | |
26b15dad JHS |
1742 | if (km->notify) |
1743 | km->notify(x, c); | |
1da177e4 | 1744 | read_unlock(&xfrm_km_lock); |
26b15dad JHS |
1745 | } |
1746 | ||
1747 | EXPORT_SYMBOL(km_policy_notify); | |
1748 | EXPORT_SYMBOL(km_state_notify); | |
1749 | ||
53bc6b4d | 1750 | void km_state_expired(struct xfrm_state *x, int hard, u32 pid) |
26b15dad JHS |
1751 | { |
1752 | struct km_event c; | |
1753 | ||
bf08867f | 1754 | c.data.hard = hard; |
53bc6b4d | 1755 | c.pid = pid; |
f60f6b8f | 1756 | c.event = XFRM_MSG_EXPIRE; |
26b15dad | 1757 | km_state_notify(x, &c); |
1da177e4 LT |
1758 | |
1759 | if (hard) | |
1760 | wake_up(&km_waitq); | |
1761 | } | |
1762 | ||
53bc6b4d | 1763 | EXPORT_SYMBOL(km_state_expired); |
26b15dad JHS |
1764 | /* |
1765 | * We send to all registered managers regardless of failure | |
1766 | * We are happy with one success | |
1767 | */ | |
980ebd25 | 1768 | int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol) |
1da177e4 | 1769 | { |
26b15dad | 1770 | int err = -EINVAL, acqret; |
1da177e4 LT |
1771 | struct xfrm_mgr *km; |
1772 | ||
1773 | read_lock(&xfrm_km_lock); | |
1774 | list_for_each_entry(km, &xfrm_km_list, list) { | |
26b15dad JHS |
1775 | acqret = km->acquire(x, t, pol, XFRM_POLICY_OUT); |
1776 | if (!acqret) | |
1777 | err = acqret; | |
1da177e4 LT |
1778 | } |
1779 | read_unlock(&xfrm_km_lock); | |
1780 | return err; | |
1781 | } | |
980ebd25 | 1782 | EXPORT_SYMBOL(km_query); |
1da177e4 | 1783 | |
5d36b180 | 1784 | int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport) |
1da177e4 LT |
1785 | { |
1786 | int err = -EINVAL; | |
1787 | struct xfrm_mgr *km; | |
1788 | ||
1789 | read_lock(&xfrm_km_lock); | |
1790 | list_for_each_entry(km, &xfrm_km_list, list) { | |
1791 | if (km->new_mapping) | |
1792 | err = km->new_mapping(x, ipaddr, sport); | |
1793 | if (!err) | |
1794 | break; | |
1795 | } | |
1796 | read_unlock(&xfrm_km_lock); | |
1797 | return err; | |
1798 | } | |
1799 | EXPORT_SYMBOL(km_new_mapping); | |
1800 | ||
6c5c8ca7 | 1801 | void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid) |
1da177e4 | 1802 | { |
26b15dad | 1803 | struct km_event c; |
1da177e4 | 1804 | |
bf08867f | 1805 | c.data.hard = hard; |
6c5c8ca7 | 1806 | c.pid = pid; |
f60f6b8f | 1807 | c.event = XFRM_MSG_POLEXPIRE; |
26b15dad | 1808 | km_policy_notify(pol, dir, &c); |
1da177e4 LT |
1809 | |
1810 | if (hard) | |
1811 | wake_up(&km_waitq); | |
1812 | } | |
a70fcb0b | 1813 | EXPORT_SYMBOL(km_policy_expired); |
1da177e4 | 1814 | |
2d60abc2 | 1815 | #ifdef CONFIG_XFRM_MIGRATE |
80c9abaa | 1816 | int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type, |
13c1d189 AE |
1817 | struct xfrm_migrate *m, int num_migrate, |
1818 | struct xfrm_kmaddress *k) | |
80c9abaa SS |
1819 | { |
1820 | int err = -EINVAL; | |
1821 | int ret; | |
1822 | struct xfrm_mgr *km; | |
1823 | ||
1824 | read_lock(&xfrm_km_lock); | |
1825 | list_for_each_entry(km, &xfrm_km_list, list) { | |
1826 | if (km->migrate) { | |
13c1d189 | 1827 | ret = km->migrate(sel, dir, type, m, num_migrate, k); |
80c9abaa SS |
1828 | if (!ret) |
1829 | err = ret; | |
1830 | } | |
1831 | } | |
1832 | read_unlock(&xfrm_km_lock); | |
1833 | return err; | |
1834 | } | |
1835 | EXPORT_SYMBOL(km_migrate); | |
2d60abc2 | 1836 | #endif |
80c9abaa | 1837 | |
97a64b45 MN |
1838 | int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr) |
1839 | { | |
1840 | int err = -EINVAL; | |
1841 | int ret; | |
1842 | struct xfrm_mgr *km; | |
1843 | ||
1844 | read_lock(&xfrm_km_lock); | |
1845 | list_for_each_entry(km, &xfrm_km_list, list) { | |
1846 | if (km->report) { | |
1847 | ret = km->report(proto, sel, addr); | |
1848 | if (!ret) | |
1849 | err = ret; | |
1850 | } | |
1851 | } | |
1852 | read_unlock(&xfrm_km_lock); | |
1853 | return err; | |
1854 | } | |
1855 | EXPORT_SYMBOL(km_report); | |
1856 | ||
1da177e4 LT |
1857 | int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen) |
1858 | { | |
1859 | int err; | |
1860 | u8 *data; | |
1861 | struct xfrm_mgr *km; | |
1862 | struct xfrm_policy *pol = NULL; | |
1863 | ||
1864 | if (optlen <= 0 || optlen > PAGE_SIZE) | |
1865 | return -EMSGSIZE; | |
1866 | ||
1867 | data = kmalloc(optlen, GFP_KERNEL); | |
1868 | if (!data) | |
1869 | return -ENOMEM; | |
1870 | ||
1871 | err = -EFAULT; | |
1872 | if (copy_from_user(data, optval, optlen)) | |
1873 | goto out; | |
1874 | ||
1875 | err = -EINVAL; | |
1876 | read_lock(&xfrm_km_lock); | |
1877 | list_for_each_entry(km, &xfrm_km_list, list) { | |
cb969f07 | 1878 | pol = km->compile_policy(sk, optname, data, |
1da177e4 LT |
1879 | optlen, &err); |
1880 | if (err >= 0) | |
1881 | break; | |
1882 | } | |
1883 | read_unlock(&xfrm_km_lock); | |
1884 | ||
1885 | if (err >= 0) { | |
1886 | xfrm_sk_policy_insert(sk, err, pol); | |
1887 | xfrm_pol_put(pol); | |
1888 | err = 0; | |
1889 | } | |
1890 | ||
1891 | out: | |
1892 | kfree(data); | |
1893 | return err; | |
1894 | } | |
1895 | EXPORT_SYMBOL(xfrm_user_policy); | |
1896 | ||
1897 | int xfrm_register_km(struct xfrm_mgr *km) | |
1898 | { | |
1899 | write_lock_bh(&xfrm_km_lock); | |
1900 | list_add_tail(&km->list, &xfrm_km_list); | |
1901 | write_unlock_bh(&xfrm_km_lock); | |
1902 | return 0; | |
1903 | } | |
1904 | EXPORT_SYMBOL(xfrm_register_km); | |
1905 | ||
1906 | int xfrm_unregister_km(struct xfrm_mgr *km) | |
1907 | { | |
1908 | write_lock_bh(&xfrm_km_lock); | |
1909 | list_del(&km->list); | |
1910 | write_unlock_bh(&xfrm_km_lock); | |
1911 | return 0; | |
1912 | } | |
1913 | EXPORT_SYMBOL(xfrm_unregister_km); | |
1914 | ||
1915 | int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo) | |
1916 | { | |
1917 | int err = 0; | |
1918 | if (unlikely(afinfo == NULL)) | |
1919 | return -EINVAL; | |
1920 | if (unlikely(afinfo->family >= NPROTO)) | |
1921 | return -EAFNOSUPPORT; | |
f3111502 | 1922 | write_lock_bh(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1923 | if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL)) |
1924 | err = -ENOBUFS; | |
edcd5821 | 1925 | else |
1da177e4 | 1926 | xfrm_state_afinfo[afinfo->family] = afinfo; |
f3111502 | 1927 | write_unlock_bh(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1928 | return err; |
1929 | } | |
1930 | EXPORT_SYMBOL(xfrm_state_register_afinfo); | |
1931 | ||
1932 | int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo) | |
1933 | { | |
1934 | int err = 0; | |
1935 | if (unlikely(afinfo == NULL)) | |
1936 | return -EINVAL; | |
1937 | if (unlikely(afinfo->family >= NPROTO)) | |
1938 | return -EAFNOSUPPORT; | |
f3111502 | 1939 | write_lock_bh(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1940 | if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) { |
1941 | if (unlikely(xfrm_state_afinfo[afinfo->family] != afinfo)) | |
1942 | err = -EINVAL; | |
edcd5821 | 1943 | else |
1da177e4 | 1944 | xfrm_state_afinfo[afinfo->family] = NULL; |
1da177e4 | 1945 | } |
f3111502 | 1946 | write_unlock_bh(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1947 | return err; |
1948 | } | |
1949 | EXPORT_SYMBOL(xfrm_state_unregister_afinfo); | |
1950 | ||
17c2a42a | 1951 | static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family) |
1da177e4 LT |
1952 | { |
1953 | struct xfrm_state_afinfo *afinfo; | |
1954 | if (unlikely(family >= NPROTO)) | |
1955 | return NULL; | |
1956 | read_lock(&xfrm_state_afinfo_lock); | |
1957 | afinfo = xfrm_state_afinfo[family]; | |
546be240 HX |
1958 | if (unlikely(!afinfo)) |
1959 | read_unlock(&xfrm_state_afinfo_lock); | |
1da177e4 LT |
1960 | return afinfo; |
1961 | } | |
1962 | ||
17c2a42a | 1963 | static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo) |
9a429c49 | 1964 | __releases(xfrm_state_afinfo_lock) |
1da177e4 | 1965 | { |
546be240 | 1966 | read_unlock(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1967 | } |
1968 | ||
1969 | /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */ | |
1970 | void xfrm_state_delete_tunnel(struct xfrm_state *x) | |
1971 | { | |
1972 | if (x->tunnel) { | |
1973 | struct xfrm_state *t = x->tunnel; | |
1974 | ||
1975 | if (atomic_read(&t->tunnel_users) == 2) | |
1976 | xfrm_state_delete(t); | |
1977 | atomic_dec(&t->tunnel_users); | |
1978 | xfrm_state_put(t); | |
1979 | x->tunnel = NULL; | |
1980 | } | |
1981 | } | |
1982 | EXPORT_SYMBOL(xfrm_state_delete_tunnel); | |
1983 | ||
1984 | int xfrm_state_mtu(struct xfrm_state *x, int mtu) | |
1985 | { | |
c5c25238 | 1986 | int res; |
1da177e4 | 1987 | |
c5c25238 PM |
1988 | spin_lock_bh(&x->lock); |
1989 | if (x->km.state == XFRM_STATE_VALID && | |
1990 | x->type && x->type->get_mtu) | |
1991 | res = x->type->get_mtu(x, mtu); | |
1992 | else | |
28121617 | 1993 | res = mtu - x->props.header_len; |
c5c25238 | 1994 | spin_unlock_bh(&x->lock); |
1da177e4 LT |
1995 | return res; |
1996 | } | |
1997 | ||
72cb6962 HX |
1998 | int xfrm_init_state(struct xfrm_state *x) |
1999 | { | |
d094cd83 | 2000 | struct xfrm_state_afinfo *afinfo; |
df9dcb45 | 2001 | struct xfrm_mode *inner_mode; |
d094cd83 | 2002 | int family = x->props.family; |
72cb6962 HX |
2003 | int err; |
2004 | ||
d094cd83 HX |
2005 | err = -EAFNOSUPPORT; |
2006 | afinfo = xfrm_state_get_afinfo(family); | |
2007 | if (!afinfo) | |
2008 | goto error; | |
2009 | ||
2010 | err = 0; | |
2011 | if (afinfo->init_flags) | |
2012 | err = afinfo->init_flags(x); | |
2013 | ||
2014 | xfrm_state_put_afinfo(afinfo); | |
2015 | ||
2016 | if (err) | |
2017 | goto error; | |
2018 | ||
2019 | err = -EPROTONOSUPPORT; | |
13996378 | 2020 | |
df9dcb45 KM |
2021 | if (x->sel.family != AF_UNSPEC) { |
2022 | inner_mode = xfrm_get_mode(x->props.mode, x->sel.family); | |
2023 | if (inner_mode == NULL) | |
2024 | goto error; | |
2025 | ||
2026 | if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) && | |
2027 | family != x->sel.family) { | |
2028 | xfrm_put_mode(inner_mode); | |
2029 | goto error; | |
2030 | } | |
2031 | ||
2032 | x->inner_mode = inner_mode; | |
2033 | } else { | |
2034 | struct xfrm_mode *inner_mode_iaf; | |
2035 | ||
2036 | inner_mode = xfrm_get_mode(x->props.mode, AF_INET); | |
2037 | if (inner_mode == NULL) | |
2038 | goto error; | |
2039 | ||
2040 | if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL)) { | |
2041 | xfrm_put_mode(inner_mode); | |
2042 | goto error; | |
2043 | } | |
2044 | ||
2045 | inner_mode_iaf = xfrm_get_mode(x->props.mode, AF_INET6); | |
2046 | if (inner_mode_iaf == NULL) | |
2047 | goto error; | |
2048 | ||
2049 | if (!(inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL)) { | |
2050 | xfrm_put_mode(inner_mode_iaf); | |
2051 | goto error; | |
2052 | } | |
2053 | ||
2054 | if (x->props.family == AF_INET) { | |
2055 | x->inner_mode = inner_mode; | |
2056 | x->inner_mode_iaf = inner_mode_iaf; | |
2057 | } else { | |
2058 | x->inner_mode = inner_mode_iaf; | |
2059 | x->inner_mode_iaf = inner_mode; | |
2060 | } | |
2061 | } | |
13996378 | 2062 | |
d094cd83 | 2063 | x->type = xfrm_get_type(x->id.proto, family); |
72cb6962 HX |
2064 | if (x->type == NULL) |
2065 | goto error; | |
2066 | ||
2067 | err = x->type->init_state(x); | |
2068 | if (err) | |
2069 | goto error; | |
2070 | ||
13996378 HX |
2071 | x->outer_mode = xfrm_get_mode(x->props.mode, family); |
2072 | if (x->outer_mode == NULL) | |
b59f45d0 HX |
2073 | goto error; |
2074 | ||
72cb6962 HX |
2075 | x->km.state = XFRM_STATE_VALID; |
2076 | ||
2077 | error: | |
2078 | return err; | |
2079 | } | |
2080 | ||
2081 | EXPORT_SYMBOL(xfrm_init_state); | |
a716c119 | 2082 | |
1da177e4 LT |
2083 | void __init xfrm_state_init(void) |
2084 | { | |
f034b5d4 DM |
2085 | unsigned int sz; |
2086 | ||
2087 | sz = sizeof(struct hlist_head) * 8; | |
2088 | ||
44e36b42 DM |
2089 | xfrm_state_bydst = xfrm_hash_alloc(sz); |
2090 | xfrm_state_bysrc = xfrm_hash_alloc(sz); | |
2091 | xfrm_state_byspi = xfrm_hash_alloc(sz); | |
f034b5d4 DM |
2092 | if (!xfrm_state_bydst || !xfrm_state_bysrc || !xfrm_state_byspi) |
2093 | panic("XFRM: Cannot allocate bydst/bysrc/byspi hashes."); | |
2094 | xfrm_state_hmask = ((sz / sizeof(struct hlist_head)) - 1); | |
1da177e4 | 2095 | |
c4028958 | 2096 | INIT_WORK(&xfrm_state_gc_work, xfrm_state_gc_task); |
1da177e4 LT |
2097 | } |
2098 | ||
ab5f5e8b | 2099 | #ifdef CONFIG_AUDITSYSCALL |
cf35f43e IJ |
2100 | static void xfrm_audit_helper_sainfo(struct xfrm_state *x, |
2101 | struct audit_buffer *audit_buf) | |
ab5f5e8b | 2102 | { |
68277acc PM |
2103 | struct xfrm_sec_ctx *ctx = x->security; |
2104 | u32 spi = ntohl(x->id.spi); | |
2105 | ||
2106 | if (ctx) | |
ab5f5e8b | 2107 | audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s", |
68277acc | 2108 | ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str); |
ab5f5e8b JL |
2109 | |
2110 | switch(x->props.family) { | |
2111 | case AF_INET: | |
68277acc PM |
2112 | audit_log_format(audit_buf, |
2113 | " src=" NIPQUAD_FMT " dst=" NIPQUAD_FMT, | |
ab5f5e8b JL |
2114 | NIPQUAD(x->props.saddr.a4), |
2115 | NIPQUAD(x->id.daddr.a4)); | |
2116 | break; | |
2117 | case AF_INET6: | |
5b095d98 | 2118 | audit_log_format(audit_buf, " src=%pI6 dst=%pI6", |
fdb46ee7 | 2119 | x->props.saddr.a6, x->id.daddr.a6); |
ab5f5e8b JL |
2120 | break; |
2121 | } | |
68277acc PM |
2122 | |
2123 | audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi); | |
ab5f5e8b JL |
2124 | } |
2125 | ||
cf35f43e IJ |
2126 | static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family, |
2127 | struct audit_buffer *audit_buf) | |
afeb14b4 PM |
2128 | { |
2129 | struct iphdr *iph4; | |
2130 | struct ipv6hdr *iph6; | |
2131 | ||
2132 | switch (family) { | |
2133 | case AF_INET: | |
2134 | iph4 = ip_hdr(skb); | |
2135 | audit_log_format(audit_buf, | |
2136 | " src=" NIPQUAD_FMT " dst=" NIPQUAD_FMT, | |
2137 | NIPQUAD(iph4->saddr), | |
2138 | NIPQUAD(iph4->daddr)); | |
2139 | break; | |
2140 | case AF_INET6: | |
2141 | iph6 = ipv6_hdr(skb); | |
2142 | audit_log_format(audit_buf, | |
5b095d98 | 2143 | " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x", |
fdb46ee7 | 2144 | &iph6->saddr,&iph6->daddr, |
afeb14b4 PM |
2145 | iph6->flow_lbl[0] & 0x0f, |
2146 | iph6->flow_lbl[1], | |
2147 | iph6->flow_lbl[2]); | |
2148 | break; | |
2149 | } | |
2150 | } | |
2151 | ||
68277acc | 2152 | void xfrm_audit_state_add(struct xfrm_state *x, int result, |
2532386f | 2153 | uid_t auid, u32 sessionid, u32 secid) |
ab5f5e8b JL |
2154 | { |
2155 | struct audit_buffer *audit_buf; | |
ab5f5e8b | 2156 | |
afeb14b4 | 2157 | audit_buf = xfrm_audit_start("SAD-add"); |
ab5f5e8b JL |
2158 | if (audit_buf == NULL) |
2159 | return; | |
2532386f | 2160 | xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); |
afeb14b4 PM |
2161 | xfrm_audit_helper_sainfo(x, audit_buf); |
2162 | audit_log_format(audit_buf, " res=%u", result); | |
ab5f5e8b JL |
2163 | audit_log_end(audit_buf); |
2164 | } | |
2165 | EXPORT_SYMBOL_GPL(xfrm_audit_state_add); | |
2166 | ||
68277acc | 2167 | void xfrm_audit_state_delete(struct xfrm_state *x, int result, |
2532386f | 2168 | uid_t auid, u32 sessionid, u32 secid) |
ab5f5e8b JL |
2169 | { |
2170 | struct audit_buffer *audit_buf; | |
ab5f5e8b | 2171 | |
afeb14b4 | 2172 | audit_buf = xfrm_audit_start("SAD-delete"); |
ab5f5e8b JL |
2173 | if (audit_buf == NULL) |
2174 | return; | |
2532386f | 2175 | xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); |
afeb14b4 PM |
2176 | xfrm_audit_helper_sainfo(x, audit_buf); |
2177 | audit_log_format(audit_buf, " res=%u", result); | |
ab5f5e8b JL |
2178 | audit_log_end(audit_buf); |
2179 | } | |
2180 | EXPORT_SYMBOL_GPL(xfrm_audit_state_delete); | |
afeb14b4 PM |
2181 | |
2182 | void xfrm_audit_state_replay_overflow(struct xfrm_state *x, | |
2183 | struct sk_buff *skb) | |
2184 | { | |
2185 | struct audit_buffer *audit_buf; | |
2186 | u32 spi; | |
2187 | ||
2188 | audit_buf = xfrm_audit_start("SA-replay-overflow"); | |
2189 | if (audit_buf == NULL) | |
2190 | return; | |
2191 | xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); | |
2192 | /* don't record the sequence number because it's inherent in this kind | |
2193 | * of audit message */ | |
2194 | spi = ntohl(x->id.spi); | |
2195 | audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi); | |
2196 | audit_log_end(audit_buf); | |
2197 | } | |
2198 | EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow); | |
2199 | ||
2200 | static void xfrm_audit_state_replay(struct xfrm_state *x, | |
2201 | struct sk_buff *skb, __be32 net_seq) | |
2202 | { | |
2203 | struct audit_buffer *audit_buf; | |
2204 | u32 spi; | |
2205 | ||
2206 | audit_buf = xfrm_audit_start("SA-replayed-pkt"); | |
2207 | if (audit_buf == NULL) | |
2208 | return; | |
2209 | xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); | |
2210 | spi = ntohl(x->id.spi); | |
2211 | audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", | |
2212 | spi, spi, ntohl(net_seq)); | |
2213 | audit_log_end(audit_buf); | |
2214 | } | |
2215 | ||
2216 | void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family) | |
2217 | { | |
2218 | struct audit_buffer *audit_buf; | |
2219 | ||
2220 | audit_buf = xfrm_audit_start("SA-notfound"); | |
2221 | if (audit_buf == NULL) | |
2222 | return; | |
2223 | xfrm_audit_helper_pktinfo(skb, family, audit_buf); | |
2224 | audit_log_end(audit_buf); | |
2225 | } | |
2226 | EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple); | |
2227 | ||
2228 | void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, | |
2229 | __be32 net_spi, __be32 net_seq) | |
2230 | { | |
2231 | struct audit_buffer *audit_buf; | |
2232 | u32 spi; | |
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 | spi = ntohl(net_spi); | |
2239 | audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", | |
2240 | spi, spi, ntohl(net_seq)); | |
2241 | audit_log_end(audit_buf); | |
2242 | } | |
2243 | EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound); | |
2244 | ||
2245 | void xfrm_audit_state_icvfail(struct xfrm_state *x, | |
2246 | struct sk_buff *skb, u8 proto) | |
2247 | { | |
2248 | struct audit_buffer *audit_buf; | |
2249 | __be32 net_spi; | |
2250 | __be32 net_seq; | |
2251 | ||
2252 | audit_buf = xfrm_audit_start("SA-icv-failure"); | |
2253 | if (audit_buf == NULL) | |
2254 | return; | |
2255 | xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); | |
2256 | if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) { | |
2257 | u32 spi = ntohl(net_spi); | |
2258 | audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", | |
2259 | spi, spi, ntohl(net_seq)); | |
2260 | } | |
2261 | audit_log_end(audit_buf); | |
2262 | } | |
2263 | EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail); | |
ab5f5e8b | 2264 | #endif /* CONFIG_AUDITSYSCALL */ |