blob: 4fd725a0c500ebf69a02e06fcf37ae3035ae0d98 [file] [log] [blame]
Steffen Klassert9fdc4882011-03-08 00:08:32 +00001/*
2 * xfrm_replay.c - xfrm replay detection, derived from xfrm_state.c.
Steffen Klassert97e15c32011-03-08 00:09:09 +00003 *
4 * Copyright (C) 2010 secunet Security Networks AG
5 * Copyright (C) 2010 Steffen Klassert <steffen.klassert@secunet.com>
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms and conditions of the GNU General Public License,
9 * version 2, as published by the Free Software Foundation.
10 *
11 * This program is distributed in the hope it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * more details.
15 *
16 * You should have received a copy of the GNU General Public License along with
17 * this program; if not, write to the Free Software Foundation, Inc.,
18 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
Steffen Klassert9fdc4882011-03-08 00:08:32 +000019 */
20
Paul Gortmakerbc3b2d72011-07-15 11:47:34 -040021#include <linux/export.h>
Steffen Klassert9fdc4882011-03-08 00:08:32 +000022#include <net/xfrm.h>
23
Steffen Klassert2cd08462011-03-08 00:09:51 +000024u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq)
25{
26 u32 seq, seq_hi, bottom;
27 struct xfrm_replay_state_esn *replay_esn = x->replay_esn;
28
29 if (!(x->props.flags & XFRM_STATE_ESN))
30 return 0;
31
32 seq = ntohl(net_seq);
33 seq_hi = replay_esn->seq_hi;
34 bottom = replay_esn->seq - replay_esn->replay_window + 1;
35
36 if (likely(replay_esn->seq >= replay_esn->replay_window - 1)) {
37 /* A. same subspace */
38 if (unlikely(seq < bottom))
39 seq_hi++;
40 } else {
41 /* B. window spans two subspaces */
42 if (unlikely(seq >= bottom))
43 seq_hi--;
44 }
45
46 return seq_hi;
47}
48
Steffen Klassert9fdc4882011-03-08 00:08:32 +000049static void xfrm_replay_notify(struct xfrm_state *x, int event)
50{
51 struct km_event c;
52 /* we send notify messages in case
53 * 1. we updated on of the sequence numbers, and the seqno difference
54 * is at least x->replay_maxdiff, in this case we also update the
55 * timeout of our timer function
56 * 2. if x->replay_maxage has elapsed since last update,
57 * and there were changes
58 *
59 * The state structure must be locked!
60 */
61
62 switch (event) {
63 case XFRM_REPLAY_UPDATE:
Thomas Egerercd808fc2013-09-19 13:19:19 +020064 if (!x->replay_maxdiff ||
65 ((x->replay.seq - x->preplay.seq < x->replay_maxdiff) &&
66 (x->replay.oseq - x->preplay.oseq < x->replay_maxdiff))) {
Steffen Klassert9fdc4882011-03-08 00:08:32 +000067 if (x->xflags & XFRM_TIME_DEFER)
68 event = XFRM_REPLAY_TIMEOUT;
69 else
70 return;
71 }
72
73 break;
74
75 case XFRM_REPLAY_TIMEOUT:
76 if (memcmp(&x->replay, &x->preplay,
77 sizeof(struct xfrm_replay_state)) == 0) {
78 x->xflags |= XFRM_TIME_DEFER;
79 return;
80 }
81
82 break;
83 }
84
85 memcpy(&x->preplay, &x->replay, sizeof(struct xfrm_replay_state));
86 c.event = XFRM_MSG_NEWAE;
87 c.data.aevent = event;
88 km_state_notify(x, &c);
89
90 if (x->replay_maxage &&
91 !mod_timer(&x->rtimer, jiffies + x->replay_maxage))
92 x->xflags &= ~XFRM_TIME_DEFER;
93}
94
95static int xfrm_replay_overflow(struct xfrm_state *x, struct sk_buff *skb)
96{
97 int err = 0;
98 struct net *net = xs_net(x);
99
100 if (x->type->flags & XFRM_TYPE_REPLAY_PROT) {
101 XFRM_SKB_CB(skb)->seq.output.low = ++x->replay.oseq;
Herbert Xu407d34e2015-05-21 00:38:12 +0800102 XFRM_SKB_CB(skb)->seq.output.hi = 0;
Steffen Klassert9fdc4882011-03-08 00:08:32 +0000103 if (unlikely(x->replay.oseq == 0)) {
104 x->replay.oseq--;
105 xfrm_audit_state_replay_overflow(x, skb);
106 err = -EOVERFLOW;
107
108 return err;
109 }
110 if (xfrm_aevent_is_on(net))
111 x->repl->notify(x, XFRM_REPLAY_UPDATE);
112 }
113
114 return err;
115}
116
117static int xfrm_replay_check(struct xfrm_state *x,
118 struct sk_buff *skb, __be32 net_seq)
119{
120 u32 diff;
121 u32 seq = ntohl(net_seq);
122
Steffen Klassert36ae0142011-03-28 19:45:52 +0000123 if (!x->props.replay_window)
124 return 0;
125
Steffen Klassert9fdc4882011-03-08 00:08:32 +0000126 if (unlikely(seq == 0))
127 goto err;
128
129 if (likely(seq > x->replay.seq))
130 return 0;
131
132 diff = x->replay.seq - seq;
Fan Du33fce602013-09-17 15:14:13 +0800133 if (diff >= x->props.replay_window) {
Steffen Klassert9fdc4882011-03-08 00:08:32 +0000134 x->stats.replay_window++;
135 goto err;
136 }
137
138 if (x->replay.bitmap & (1U << diff)) {
139 x->stats.replay++;
140 goto err;
141 }
142 return 0;
143
144err:
145 xfrm_audit_state_replay(x, skb, net_seq);
146 return -EINVAL;
147}
148
149static void xfrm_replay_advance(struct xfrm_state *x, __be32 net_seq)
150{
151 u32 diff;
152 u32 seq = ntohl(net_seq);
153
154 if (!x->props.replay_window)
155 return;
156
157 if (seq > x->replay.seq) {
158 diff = seq - x->replay.seq;
159 if (diff < x->props.replay_window)
160 x->replay.bitmap = ((x->replay.bitmap) << diff) | 1;
161 else
162 x->replay.bitmap = 1;
163 x->replay.seq = seq;
164 } else {
165 diff = x->replay.seq - seq;
166 x->replay.bitmap |= (1U << diff);
167 }
168
169 if (xfrm_aevent_is_on(xs_net(x)))
Steffen Klassert1265fd62012-03-21 23:36:13 +0000170 x->repl->notify(x, XFRM_REPLAY_UPDATE);
Steffen Klassert9fdc4882011-03-08 00:08:32 +0000171}
172
Steffen Klassert97e15c32011-03-08 00:09:09 +0000173static int xfrm_replay_overflow_bmp(struct xfrm_state *x, struct sk_buff *skb)
174{
175 int err = 0;
176 struct xfrm_replay_state_esn *replay_esn = x->replay_esn;
177 struct net *net = xs_net(x);
178
179 if (x->type->flags & XFRM_TYPE_REPLAY_PROT) {
180 XFRM_SKB_CB(skb)->seq.output.low = ++replay_esn->oseq;
Herbert Xu407d34e2015-05-21 00:38:12 +0800181 XFRM_SKB_CB(skb)->seq.output.hi = 0;
Steffen Klassert97e15c32011-03-08 00:09:09 +0000182 if (unlikely(replay_esn->oseq == 0)) {
183 replay_esn->oseq--;
184 xfrm_audit_state_replay_overflow(x, skb);
185 err = -EOVERFLOW;
186
187 return err;
188 }
189 if (xfrm_aevent_is_on(net))
190 x->repl->notify(x, XFRM_REPLAY_UPDATE);
191 }
192
193 return err;
194}
195
196static int xfrm_replay_check_bmp(struct xfrm_state *x,
197 struct sk_buff *skb, __be32 net_seq)
198{
199 unsigned int bitnr, nr;
200 struct xfrm_replay_state_esn *replay_esn = x->replay_esn;
Steffen Klassert36ae0142011-03-28 19:45:52 +0000201 u32 pos;
Steffen Klassert97e15c32011-03-08 00:09:09 +0000202 u32 seq = ntohl(net_seq);
203 u32 diff = replay_esn->seq - seq;
Steffen Klassert36ae0142011-03-28 19:45:52 +0000204
205 if (!replay_esn->replay_window)
206 return 0;
207
Steffen Klassert97e15c32011-03-08 00:09:09 +0000208 if (unlikely(seq == 0))
209 goto err;
210
211 if (likely(seq > replay_esn->seq))
212 return 0;
213
214 if (diff >= replay_esn->replay_window) {
215 x->stats.replay_window++;
216 goto err;
217 }
218
Steffen Klassert1d974372011-10-11 01:58:37 +0000219 pos = (replay_esn->seq - 1) % replay_esn->replay_window;
220
221 if (pos >= diff)
Steffen Klassert97e15c32011-03-08 00:09:09 +0000222 bitnr = (pos - diff) % replay_esn->replay_window;
Steffen Klassert1d974372011-10-11 01:58:37 +0000223 else
Steffen Klassert97e15c32011-03-08 00:09:09 +0000224 bitnr = replay_esn->replay_window - (diff - pos);
Steffen Klassert1d974372011-10-11 01:58:37 +0000225
226 nr = bitnr >> 5;
227 bitnr = bitnr & 0x1F;
228 if (replay_esn->bmp[nr] & (1U << bitnr))
229 goto err_replay;
230
Steffen Klassert97e15c32011-03-08 00:09:09 +0000231 return 0;
232
233err_replay:
234 x->stats.replay++;
235err:
236 xfrm_audit_state_replay(x, skb, net_seq);
237 return -EINVAL;
238}
239
240static void xfrm_replay_advance_bmp(struct xfrm_state *x, __be32 net_seq)
241{
242 unsigned int bitnr, nr, i;
243 u32 diff;
244 struct xfrm_replay_state_esn *replay_esn = x->replay_esn;
245 u32 seq = ntohl(net_seq);
Nickolai Zeldoviche2f67252013-01-17 13:58:28 -0500246 u32 pos;
Steffen Klassert97e15c32011-03-08 00:09:09 +0000247
248 if (!replay_esn->replay_window)
249 return;
250
Nickolai Zeldoviche2f67252013-01-17 13:58:28 -0500251 pos = (replay_esn->seq - 1) % replay_esn->replay_window;
252
Steffen Klassert97e15c32011-03-08 00:09:09 +0000253 if (seq > replay_esn->seq) {
254 diff = seq - replay_esn->seq;
255
256 if (diff < replay_esn->replay_window) {
257 for (i = 1; i < diff; i++) {
258 bitnr = (pos + i) % replay_esn->replay_window;
259 nr = bitnr >> 5;
260 bitnr = bitnr & 0x1F;
261 replay_esn->bmp[nr] &= ~(1U << bitnr);
262 }
Steffen Klassert97e15c32011-03-08 00:09:09 +0000263 } else {
Steffen Klasserte7566822011-06-05 20:46:03 +0000264 nr = (replay_esn->replay_window - 1) >> 5;
Steffen Klassert97e15c32011-03-08 00:09:09 +0000265 for (i = 0; i <= nr; i++)
266 replay_esn->bmp[i] = 0;
Steffen Klassert97e15c32011-03-08 00:09:09 +0000267 }
268
Steffen Klassert1d974372011-10-11 01:58:37 +0000269 bitnr = (pos + diff) % replay_esn->replay_window;
Steffen Klassert97e15c32011-03-08 00:09:09 +0000270 replay_esn->seq = seq;
271 } else {
272 diff = replay_esn->seq - seq;
273
Steffen Klassert1d974372011-10-11 01:58:37 +0000274 if (pos >= diff)
Steffen Klassert97e15c32011-03-08 00:09:09 +0000275 bitnr = (pos - diff) % replay_esn->replay_window;
Steffen Klassert1d974372011-10-11 01:58:37 +0000276 else
Steffen Klassert97e15c32011-03-08 00:09:09 +0000277 bitnr = replay_esn->replay_window - (diff - pos);
Steffen Klassert97e15c32011-03-08 00:09:09 +0000278 }
279
Steffen Klassert1d974372011-10-11 01:58:37 +0000280 nr = bitnr >> 5;
281 bitnr = bitnr & 0x1F;
282 replay_esn->bmp[nr] |= (1U << bitnr);
283
Steffen Klassert97e15c32011-03-08 00:09:09 +0000284 if (xfrm_aevent_is_on(xs_net(x)))
Steffen Klassert1265fd62012-03-21 23:36:13 +0000285 x->repl->notify(x, XFRM_REPLAY_UPDATE);
Steffen Klassert97e15c32011-03-08 00:09:09 +0000286}
287
288static void xfrm_replay_notify_bmp(struct xfrm_state *x, int event)
289{
290 struct km_event c;
291 struct xfrm_replay_state_esn *replay_esn = x->replay_esn;
292 struct xfrm_replay_state_esn *preplay_esn = x->preplay_esn;
293
294 /* we send notify messages in case
295 * 1. we updated on of the sequence numbers, and the seqno difference
296 * is at least x->replay_maxdiff, in this case we also update the
297 * timeout of our timer function
298 * 2. if x->replay_maxage has elapsed since last update,
299 * and there were changes
300 *
301 * The state structure must be locked!
302 */
303
304 switch (event) {
305 case XFRM_REPLAY_UPDATE:
Thomas Egerercd808fc2013-09-19 13:19:19 +0200306 if (!x->replay_maxdiff ||
307 ((replay_esn->seq - preplay_esn->seq < x->replay_maxdiff) &&
308 (replay_esn->oseq - preplay_esn->oseq
309 < x->replay_maxdiff))) {
Steffen Klassert97e15c32011-03-08 00:09:09 +0000310 if (x->xflags & XFRM_TIME_DEFER)
311 event = XFRM_REPLAY_TIMEOUT;
312 else
313 return;
314 }
315
316 break;
317
318 case XFRM_REPLAY_TIMEOUT:
319 if (memcmp(x->replay_esn, x->preplay_esn,
320 xfrm_replay_state_esn_len(replay_esn)) == 0) {
321 x->xflags |= XFRM_TIME_DEFER;
322 return;
323 }
324
325 break;
326 }
327
328 memcpy(x->preplay_esn, x->replay_esn,
329 xfrm_replay_state_esn_len(replay_esn));
330 c.event = XFRM_MSG_NEWAE;
331 c.data.aevent = event;
332 km_state_notify(x, &c);
333
334 if (x->replay_maxage &&
335 !mod_timer(&x->rtimer, jiffies + x->replay_maxage))
336 x->xflags &= ~XFRM_TIME_DEFER;
337}
338
Steffen Klassert0017c0b2013-03-11 10:32:16 +0100339static void xfrm_replay_notify_esn(struct xfrm_state *x, int event)
340{
341 u32 seq_diff, oseq_diff;
342 struct km_event c;
343 struct xfrm_replay_state_esn *replay_esn = x->replay_esn;
344 struct xfrm_replay_state_esn *preplay_esn = x->preplay_esn;
345
346 /* we send notify messages in case
347 * 1. we updated on of the sequence numbers, and the seqno difference
348 * is at least x->replay_maxdiff, in this case we also update the
349 * timeout of our timer function
350 * 2. if x->replay_maxage has elapsed since last update,
351 * and there were changes
352 *
353 * The state structure must be locked!
354 */
355
356 switch (event) {
357 case XFRM_REPLAY_UPDATE:
Thomas Egerercd808fc2013-09-19 13:19:19 +0200358 if (x->replay_maxdiff) {
359 if (replay_esn->seq_hi == preplay_esn->seq_hi)
360 seq_diff = replay_esn->seq - preplay_esn->seq;
Steffen Klassert0017c0b2013-03-11 10:32:16 +0100361 else
Thomas Egerercd808fc2013-09-19 13:19:19 +0200362 seq_diff = ~preplay_esn->seq + replay_esn->seq
363 + 1;
364
365 if (replay_esn->oseq_hi == preplay_esn->oseq_hi)
366 oseq_diff = replay_esn->oseq
367 - preplay_esn->oseq;
368 else
369 oseq_diff = ~preplay_esn->oseq
370 + replay_esn->oseq + 1;
371
372 if (seq_diff >= x->replay_maxdiff ||
373 oseq_diff >= x->replay_maxdiff)
374 break;
Steffen Klassert0017c0b2013-03-11 10:32:16 +0100375 }
376
Thomas Egerercd808fc2013-09-19 13:19:19 +0200377 if (x->xflags & XFRM_TIME_DEFER)
378 event = XFRM_REPLAY_TIMEOUT;
379 else
380 return;
381
Steffen Klassert0017c0b2013-03-11 10:32:16 +0100382 break;
383
384 case XFRM_REPLAY_TIMEOUT:
385 if (memcmp(x->replay_esn, x->preplay_esn,
386 xfrm_replay_state_esn_len(replay_esn)) == 0) {
387 x->xflags |= XFRM_TIME_DEFER;
388 return;
389 }
390
391 break;
392 }
393
394 memcpy(x->preplay_esn, x->replay_esn,
395 xfrm_replay_state_esn_len(replay_esn));
396 c.event = XFRM_MSG_NEWAE;
397 c.data.aevent = event;
398 km_state_notify(x, &c);
399
400 if (x->replay_maxage &&
401 !mod_timer(&x->rtimer, jiffies + x->replay_maxage))
402 x->xflags &= ~XFRM_TIME_DEFER;
403}
404
Steffen Klassert2cd08462011-03-08 00:09:51 +0000405static int xfrm_replay_overflow_esn(struct xfrm_state *x, struct sk_buff *skb)
406{
407 int err = 0;
408 struct xfrm_replay_state_esn *replay_esn = x->replay_esn;
409 struct net *net = xs_net(x);
410
411 if (x->type->flags & XFRM_TYPE_REPLAY_PROT) {
412 XFRM_SKB_CB(skb)->seq.output.low = ++replay_esn->oseq;
413 XFRM_SKB_CB(skb)->seq.output.hi = replay_esn->oseq_hi;
414
415 if (unlikely(replay_esn->oseq == 0)) {
416 XFRM_SKB_CB(skb)->seq.output.hi = ++replay_esn->oseq_hi;
417
418 if (replay_esn->oseq_hi == 0) {
419 replay_esn->oseq--;
420 replay_esn->oseq_hi--;
421 xfrm_audit_state_replay_overflow(x, skb);
422 err = -EOVERFLOW;
423
424 return err;
425 }
426 }
427 if (xfrm_aevent_is_on(net))
428 x->repl->notify(x, XFRM_REPLAY_UPDATE);
429 }
430
431 return err;
432}
433
434static int xfrm_replay_check_esn(struct xfrm_state *x,
435 struct sk_buff *skb, __be32 net_seq)
436{
437 unsigned int bitnr, nr;
438 u32 diff;
439 struct xfrm_replay_state_esn *replay_esn = x->replay_esn;
Steffen Klassert36ae0142011-03-28 19:45:52 +0000440 u32 pos;
Steffen Klassert2cd08462011-03-08 00:09:51 +0000441 u32 seq = ntohl(net_seq);
Steffen Klassert2cd08462011-03-08 00:09:51 +0000442 u32 wsize = replay_esn->replay_window;
443 u32 top = replay_esn->seq;
444 u32 bottom = top - wsize + 1;
445
Steffen Klassert36ae0142011-03-28 19:45:52 +0000446 if (!wsize)
447 return 0;
448
Steffen Klassert2cd08462011-03-08 00:09:51 +0000449 if (unlikely(seq == 0 && replay_esn->seq_hi == 0 &&
450 (replay_esn->seq < replay_esn->replay_window - 1)))
451 goto err;
452
453 diff = top - seq;
454
455 if (likely(top >= wsize - 1)) {
456 /* A. same subspace */
457 if (likely(seq > top) || seq < bottom)
458 return 0;
459 } else {
460 /* B. window spans two subspaces */
461 if (likely(seq > top && seq < bottom))
462 return 0;
463 if (seq >= bottom)
464 diff = ~seq + top + 1;
465 }
466
467 if (diff >= replay_esn->replay_window) {
468 x->stats.replay_window++;
469 goto err;
470 }
471
Steffen Klassert1d974372011-10-11 01:58:37 +0000472 pos = (replay_esn->seq - 1) % replay_esn->replay_window;
473
474 if (pos >= diff)
Steffen Klassert2cd08462011-03-08 00:09:51 +0000475 bitnr = (pos - diff) % replay_esn->replay_window;
Steffen Klassert1d974372011-10-11 01:58:37 +0000476 else
Steffen Klassert2cd08462011-03-08 00:09:51 +0000477 bitnr = replay_esn->replay_window - (diff - pos);
Steffen Klassert1d974372011-10-11 01:58:37 +0000478
479 nr = bitnr >> 5;
480 bitnr = bitnr & 0x1F;
481 if (replay_esn->bmp[nr] & (1U << bitnr))
482 goto err_replay;
483
Steffen Klassert2cd08462011-03-08 00:09:51 +0000484 return 0;
485
486err_replay:
487 x->stats.replay++;
488err:
489 xfrm_audit_state_replay(x, skb, net_seq);
490 return -EINVAL;
491}
492
Steffen Klassert3b59df42012-09-04 00:03:29 +0000493static int xfrm_replay_recheck_esn(struct xfrm_state *x,
494 struct sk_buff *skb, __be32 net_seq)
495{
496 if (unlikely(XFRM_SKB_CB(skb)->seq.input.hi !=
497 htonl(xfrm_replay_seqhi(x, net_seq)))) {
498 x->stats.replay_window++;
499 return -EINVAL;
500 }
501
502 return xfrm_replay_check_esn(x, skb, net_seq);
503}
504
Steffen Klassert2cd08462011-03-08 00:09:51 +0000505static void xfrm_replay_advance_esn(struct xfrm_state *x, __be32 net_seq)
506{
507 unsigned int bitnr, nr, i;
508 int wrap;
509 u32 diff, pos, seq, seq_hi;
510 struct xfrm_replay_state_esn *replay_esn = x->replay_esn;
511
512 if (!replay_esn->replay_window)
513 return;
514
515 seq = ntohl(net_seq);
516 pos = (replay_esn->seq - 1) % replay_esn->replay_window;
517 seq_hi = xfrm_replay_seqhi(x, net_seq);
518 wrap = seq_hi - replay_esn->seq_hi;
519
520 if ((!wrap && seq > replay_esn->seq) || wrap > 0) {
521 if (likely(!wrap))
522 diff = seq - replay_esn->seq;
523 else
524 diff = ~replay_esn->seq + seq + 1;
525
526 if (diff < replay_esn->replay_window) {
527 for (i = 1; i < diff; i++) {
528 bitnr = (pos + i) % replay_esn->replay_window;
529 nr = bitnr >> 5;
530 bitnr = bitnr & 0x1F;
531 replay_esn->bmp[nr] &= ~(1U << bitnr);
532 }
Steffen Klassert2cd08462011-03-08 00:09:51 +0000533 } else {
Steffen Klasserte7566822011-06-05 20:46:03 +0000534 nr = (replay_esn->replay_window - 1) >> 5;
Steffen Klassert2cd08462011-03-08 00:09:51 +0000535 for (i = 0; i <= nr; i++)
536 replay_esn->bmp[i] = 0;
Steffen Klassert2cd08462011-03-08 00:09:51 +0000537 }
538
Steffen Klassert1d974372011-10-11 01:58:37 +0000539 bitnr = (pos + diff) % replay_esn->replay_window;
Steffen Klassert2cd08462011-03-08 00:09:51 +0000540 replay_esn->seq = seq;
541
542 if (unlikely(wrap > 0))
543 replay_esn->seq_hi++;
544 } else {
545 diff = replay_esn->seq - seq;
546
Steffen Klassert1d974372011-10-11 01:58:37 +0000547 if (pos >= diff)
Steffen Klassert2cd08462011-03-08 00:09:51 +0000548 bitnr = (pos - diff) % replay_esn->replay_window;
Steffen Klassert1d974372011-10-11 01:58:37 +0000549 else
Steffen Klassert2cd08462011-03-08 00:09:51 +0000550 bitnr = replay_esn->replay_window - (diff - pos);
Steffen Klassert2cd08462011-03-08 00:09:51 +0000551 }
552
Steffen Klassert1d974372011-10-11 01:58:37 +0000553 nr = bitnr >> 5;
554 bitnr = bitnr & 0x1F;
555 replay_esn->bmp[nr] |= (1U << bitnr);
556
Steffen Klassert2cd08462011-03-08 00:09:51 +0000557 if (xfrm_aevent_is_on(xs_net(x)))
Steffen Klassert1265fd62012-03-21 23:36:13 +0000558 x->repl->notify(x, XFRM_REPLAY_UPDATE);
Steffen Klassert2cd08462011-03-08 00:09:51 +0000559}
560
Steffen Klassert9fdc4882011-03-08 00:08:32 +0000561static struct xfrm_replay xfrm_replay_legacy = {
562 .advance = xfrm_replay_advance,
563 .check = xfrm_replay_check,
Steffen Klassert3b59df42012-09-04 00:03:29 +0000564 .recheck = xfrm_replay_check,
Steffen Klassert9fdc4882011-03-08 00:08:32 +0000565 .notify = xfrm_replay_notify,
566 .overflow = xfrm_replay_overflow,
567};
568
Steffen Klassert97e15c32011-03-08 00:09:09 +0000569static struct xfrm_replay xfrm_replay_bmp = {
570 .advance = xfrm_replay_advance_bmp,
571 .check = xfrm_replay_check_bmp,
Steffen Klassert3b59df42012-09-04 00:03:29 +0000572 .recheck = xfrm_replay_check_bmp,
Steffen Klassert97e15c32011-03-08 00:09:09 +0000573 .notify = xfrm_replay_notify_bmp,
574 .overflow = xfrm_replay_overflow_bmp,
575};
576
Steffen Klassert2cd08462011-03-08 00:09:51 +0000577static struct xfrm_replay xfrm_replay_esn = {
578 .advance = xfrm_replay_advance_esn,
579 .check = xfrm_replay_check_esn,
Steffen Klassert3b59df42012-09-04 00:03:29 +0000580 .recheck = xfrm_replay_recheck_esn,
Steffen Klassert0017c0b2013-03-11 10:32:16 +0100581 .notify = xfrm_replay_notify_esn,
Steffen Klassert2cd08462011-03-08 00:09:51 +0000582 .overflow = xfrm_replay_overflow_esn,
583};
584
Steffen Klassert9fdc4882011-03-08 00:08:32 +0000585int xfrm_init_replay(struct xfrm_state *x)
586{
Steffen Klassert97e15c32011-03-08 00:09:09 +0000587 struct xfrm_replay_state_esn *replay_esn = x->replay_esn;
588
589 if (replay_esn) {
590 if (replay_esn->replay_window >
Steffen Klassert3f602b02011-04-25 19:39:24 +0000591 replay_esn->bmp_len * sizeof(__u32) * 8)
Steffen Klassert97e15c32011-03-08 00:09:09 +0000592 return -EINVAL;
593
Ulrich Weberaafd0d82012-11-08 11:15:44 +0100594 if (x->props.flags & XFRM_STATE_ESN) {
595 if (replay_esn->replay_window == 0)
596 return -EINVAL;
597 x->repl = &xfrm_replay_esn;
598 } else
599 x->repl = &xfrm_replay_bmp;
Steffen Klassert97e15c32011-03-08 00:09:09 +0000600 } else
601 x->repl = &xfrm_replay_legacy;
602
Steffen Klassert9fdc4882011-03-08 00:08:32 +0000603 return 0;
604}
605EXPORT_SYMBOL(xfrm_init_replay);