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xfrm: allow to avoid copying DSCP during encapsulation
[linux-2.6-block.git] / net / xfrm / xfrm_user.c
CommitLineData
1da177e4
LT		 1/* xfrm_user.c: User interface to configure xfrm engine.
2 *
3 * Copyright (C) 2002 David S. Miller (davem@redhat.com)
4 *
5 * Changes:
6 * Mitsuru KANDA @USAGI
7 * Kazunori MIYAZAWA @USAGI
8 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
9 * IPv6 support
df71837d 10 *
1da177e4
LT		 11 */
12
9409f38a 13#include <linux/crypto.h>
1da177e4
LT		 14#include <linux/module.h>
15#include <linux/kernel.h>
16#include <linux/types.h>
17#include <linux/slab.h>
18#include <linux/socket.h>
19#include <linux/string.h>
20#include <linux/net.h>
21#include <linux/skbuff.h>
1da177e4
LT		 22#include <linux/pfkeyv2.h>
23#include <linux/ipsec.h>
24#include <linux/init.h>
25#include <linux/security.h>
26#include <net/sock.h>
27#include <net/xfrm.h>
88fc2c84 28#include <net/netlink.h>
fa6dd8a2 29#include <net/ah.h>
1da177e4 30#include <asm/uaccess.h>
dfd56b8b 31#if IS_ENABLED(CONFIG_IPV6)
e23c7194
MN		 32#include <linux/in6.h>
33#endif
1da177e4 34
1a6509d9
HX		 35static inline int aead_len(struct xfrm_algo_aead *alg)
36{
37 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
38}
39
5424f32e 40static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type)
1da177e4 41{
5424f32e 42 struct nlattr *rt = attrs[type];
1da177e4
LT		 43 struct xfrm_algo *algp;
44
45 if (!rt)
46 return 0;
47
5424f32e 48 algp = nla_data(rt);
0f99be0d 49 if (nla_len(rt) < xfrm_alg_len(algp))
31c26852
HX		 50 return -EINVAL;
51
1da177e4
LT		 52 switch (type) {
53 case XFRMA_ALG_AUTH:
1da177e4 54 case XFRMA_ALG_CRYPT:
1da177e4 55 case XFRMA_ALG_COMP:
1da177e4
LT		 56 break;
57
58 default:
59 return -EINVAL;
3ff50b79 60 }
1da177e4
LT		 61
62 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
63 return 0;
64}
65
4447bb33
MW		 66static int verify_auth_trunc(struct nlattr **attrs)
67{
68 struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC];
69 struct xfrm_algo_auth *algp;
70
71 if (!rt)
72 return 0;
73
74 algp = nla_data(rt);
75 if (nla_len(rt) < xfrm_alg_auth_len(algp))
76 return -EINVAL;
77
78 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
79 return 0;
80}
81
1a6509d9
HX		 82static int verify_aead(struct nlattr **attrs)
83{
84 struct nlattr *rt = attrs[XFRMA_ALG_AEAD];
85 struct xfrm_algo_aead *algp;
86
87 if (!rt)
88 return 0;
89
90 algp = nla_data(rt);
91 if (nla_len(rt) < aead_len(algp))
92 return -EINVAL;
93
94 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
95 return 0;
96}
97
5424f32e 98static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type,
eb2971b6
MN		 99 xfrm_address_t **addrp)
100{
5424f32e 101 struct nlattr *rt = attrs[type];
eb2971b6 102
cf5cb79f 103 if (rt && addrp)
5424f32e 104 *addrp = nla_data(rt);
eb2971b6 105}
df71837d 106
5424f32e 107static inline int verify_sec_ctx_len(struct nlattr **attrs)
df71837d 108{
5424f32e 109 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
df71837d 110 struct xfrm_user_sec_ctx *uctx;
df71837d
TJ		 111
112 if (!rt)
113 return 0;
114
5424f32e 115 uctx = nla_data(rt);
cf5cb79f 116 if (uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len))
df71837d
TJ		 117 return -EINVAL;
118
119 return 0;
120}
121
d8647b79
SK		 122static inline int verify_replay(struct xfrm_usersa_info *p,
123 struct nlattr **attrs)
124{
125 struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL];
ecd79187 126 struct xfrm_replay_state_esn *rs;
d8647b79 127
ecd79187
MK		 128 if (p->flags & XFRM_STATE_ESN) {
129 if (!rt)
130 return -EINVAL;
131
132 rs = nla_data(rt);
133
134 if (rs->bmp_len > XFRMA_REPLAY_ESN_MAX / sizeof(rs->bmp[0]) / 8)
135 return -EINVAL;
136
137 if (nla_len(rt) < xfrm_replay_state_esn_len(rs) &&
138 nla_len(rt) != sizeof(*rs))
139 return -EINVAL;
140 }
7833aa05 141
d8647b79
SK		 142 if (!rt)
143 return 0;
144
02aadf72
SK		 145 if (p->id.proto != IPPROTO_ESP)
146 return -EINVAL;
147
d8647b79
SK		 148 if (p->replay_window != 0)
149 return -EINVAL;
150
151 return 0;
152}
df71837d 153
1da177e4 154static int verify_newsa_info(struct xfrm_usersa_info *p,
5424f32e 155 struct nlattr **attrs)
1da177e4
LT		 156{
157 int err;
158
159 err = -EINVAL;
160 switch (p->family) {
161 case AF_INET:
162 break;
163
164 case AF_INET6:
dfd56b8b 165#if IS_ENABLED(CONFIG_IPV6)
1da177e4
LT		 166 break;
167#else
168 err = -EAFNOSUPPORT;
169 goto out;
170#endif
171
172 default:
173 goto out;
3ff50b79 174 }
1da177e4
LT		 175
176 err = -EINVAL;
177 switch (p->id.proto) {
178 case IPPROTO_AH:
4447bb33
MW		 179 if ((!attrs[XFRMA_ALG_AUTH] &&
180 !attrs[XFRMA_ALG_AUTH_TRUNC]) ||
1a6509d9 181 attrs[XFRMA_ALG_AEAD] ||
35a7aa08 182 attrs[XFRMA_ALG_CRYPT] ||
35d2856b
MW		 183 attrs[XFRMA_ALG_COMP] ||
184 attrs[XFRMA_TFCPAD])
1da177e4
LT		 185 goto out;
186 break;
187
188 case IPPROTO_ESP:
1a6509d9
HX		 189 if (attrs[XFRMA_ALG_COMP])
190 goto out;
191 if (!attrs[XFRMA_ALG_AUTH] &&
4447bb33 192 !attrs[XFRMA_ALG_AUTH_TRUNC] &&
1a6509d9
HX		 193 !attrs[XFRMA_ALG_CRYPT] &&
194 !attrs[XFRMA_ALG_AEAD])
195 goto out;
196 if ((attrs[XFRMA_ALG_AUTH] ||
4447bb33 197 attrs[XFRMA_ALG_AUTH_TRUNC] ||
1a6509d9
HX		 198 attrs[XFRMA_ALG_CRYPT]) &&
199 attrs[XFRMA_ALG_AEAD])
1da177e4 200 goto out;
35d2856b
MW		 201 if (attrs[XFRMA_TFCPAD] &&
202 p->mode != XFRM_MODE_TUNNEL)
203 goto out;
1da177e4
LT		 204 break;
205
206 case IPPROTO_COMP:
35a7aa08 207 if (!attrs[XFRMA_ALG_COMP] ||
1a6509d9 208 attrs[XFRMA_ALG_AEAD] ||
35a7aa08 209 attrs[XFRMA_ALG_AUTH] ||
4447bb33 210 attrs[XFRMA_ALG_AUTH_TRUNC] ||
35d2856b
MW		 211 attrs[XFRMA_ALG_CRYPT] ||
212 attrs[XFRMA_TFCPAD])
1da177e4
LT		 213 goto out;
214 break;
215
dfd56b8b 216#if IS_ENABLED(CONFIG_IPV6)
e23c7194
MN		 217 case IPPROTO_DSTOPTS:
218 case IPPROTO_ROUTING:
35a7aa08
TG		 219 if (attrs[XFRMA_ALG_COMP] ||
220 attrs[XFRMA_ALG_AUTH] ||
4447bb33 221 attrs[XFRMA_ALG_AUTH_TRUNC] ||
1a6509d9 222 attrs[XFRMA_ALG_AEAD] ||
35a7aa08
TG		 223 attrs[XFRMA_ALG_CRYPT] ||
224 attrs[XFRMA_ENCAP] ||
225 attrs[XFRMA_SEC_CTX] ||
35d2856b 226 attrs[XFRMA_TFCPAD] ||
35a7aa08 227 !attrs[XFRMA_COADDR])
e23c7194
MN		 228 goto out;
229 break;
230#endif
231
1da177e4
LT		 232 default:
233 goto out;
3ff50b79 234 }
1da177e4 235
1a6509d9
HX		 236 if ((err = verify_aead(attrs)))
237 goto out;
4447bb33
MW		 238 if ((err = verify_auth_trunc(attrs)))
239 goto out;
35a7aa08 240 if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH)))
1da177e4 241 goto out;
35a7aa08 242 if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT)))
1da177e4 243 goto out;
35a7aa08 244 if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP)))
1da177e4 245 goto out;
35a7aa08 246 if ((err = verify_sec_ctx_len(attrs)))
df71837d 247 goto out;
d8647b79
SK		 248 if ((err = verify_replay(p, attrs)))
249 goto out;
1da177e4
LT		 250
251 err = -EINVAL;
252 switch (p->mode) {
7e49e6de
MN		 253 case XFRM_MODE_TRANSPORT:
254 case XFRM_MODE_TUNNEL:
060f02a3 255 case XFRM_MODE_ROUTEOPTIMIZATION:
0a69452c 256 case XFRM_MODE_BEET:
1da177e4
LT		 257 break;
258
259 default:
260 goto out;
3ff50b79 261 }
1da177e4
LT		 262
263 err = 0;
264
265out:
266 return err;
267}
268
269static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
6f2f19ed 270 struct xfrm_algo_desc *(*get_byname)(const char *, int),
5424f32e 271 struct nlattr *rta)
1da177e4 272{
1da177e4
LT		 273 struct xfrm_algo *p, *ualg;
274 struct xfrm_algo_desc *algo;
275
276 if (!rta)
277 return 0;
278
5424f32e 279 ualg = nla_data(rta);
1da177e4
LT		 280
281 algo = get_byname(ualg->alg_name, 1);
282 if (!algo)
283 return -ENOSYS;
284 *props = algo->desc.sadb_alg_id;
285
0f99be0d 286 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
1da177e4
LT		 287 if (!p)
288 return -ENOMEM;
289
04ff1260 290 strcpy(p->alg_name, algo->name);
1da177e4
LT		 291 *algpp = p;
292 return 0;
293}
294
4447bb33
MW		 295static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,
296 struct nlattr *rta)
297{
298 struct xfrm_algo *ualg;
299 struct xfrm_algo_auth *p;
300 struct xfrm_algo_desc *algo;
301
302 if (!rta)
303 return 0;
304
305 ualg = nla_data(rta);
306
307 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
308 if (!algo)
309 return -ENOSYS;
310 *props = algo->desc.sadb_alg_id;
311
312 p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL);
313 if (!p)
314 return -ENOMEM;
315
316 strcpy(p->alg_name, algo->name);
317 p->alg_key_len = ualg->alg_key_len;
318 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
319 memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8);
320
321 *algpp = p;
322 return 0;
323}
324
325static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,
326 struct nlattr *rta)
327{
328 struct xfrm_algo_auth *p, *ualg;
329 struct xfrm_algo_desc *algo;
330
331 if (!rta)
332 return 0;
333
334 ualg = nla_data(rta);
335
336 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
337 if (!algo)
338 return -ENOSYS;
fa6dd8a2
ND		 339 if ((ualg->alg_trunc_len / 8) > MAX_AH_AUTH_LEN ||
340 ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits)
4447bb33
MW		 341 return -EINVAL;
342 *props = algo->desc.sadb_alg_id;
343
344 p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);
345 if (!p)
346 return -ENOMEM;
347
348 strcpy(p->alg_name, algo->name);
349 if (!p->alg_trunc_len)
350 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
351
352 *algpp = p;
353 return 0;
354}
355
1a6509d9
HX		 356static int attach_aead(struct xfrm_algo_aead **algpp, u8 *props,
357 struct nlattr *rta)
358{
359 struct xfrm_algo_aead *p, *ualg;
360 struct xfrm_algo_desc *algo;
361
362 if (!rta)
363 return 0;
364
365 ualg = nla_data(rta);
366
367 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
368 if (!algo)
369 return -ENOSYS;
370 *props = algo->desc.sadb_alg_id;
371
372 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
373 if (!p)
374 return -ENOMEM;
375
376 strcpy(p->alg_name, algo->name);
377 *algpp = p;
378 return 0;
379}
380
e2b19125
SK		 381static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn,
382 struct nlattr *rp)
383{
384 struct xfrm_replay_state_esn *up;
ecd79187 385 int ulen;
e2b19125
SK		 386
387 if (!replay_esn || !rp)
388 return 0;
389
390 up = nla_data(rp);
ecd79187 391 ulen = xfrm_replay_state_esn_len(up);
e2b19125 392
ecd79187 393 if (nla_len(rp) < ulen || xfrm_replay_state_esn_len(replay_esn) != ulen)
e2b19125
SK		 394 return -EINVAL;
395
396 return 0;
397}
398
d8647b79
SK		 399static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,
400 struct xfrm_replay_state_esn **preplay_esn,
401 struct nlattr *rta)
402{
403 struct xfrm_replay_state_esn *p, *pp, *up;
ecd79187 404 int klen, ulen;
d8647b79
SK		 405
406 if (!rta)
407 return 0;
408
409 up = nla_data(rta);
ecd79187
MK		 410 klen = xfrm_replay_state_esn_len(up);
411 ulen = nla_len(rta) >= klen ? klen : sizeof(*up);
d8647b79 412
ecd79187 413 p = kzalloc(klen, GFP_KERNEL);
d8647b79
SK		 414 if (!p)
415 return -ENOMEM;
416
ecd79187 417 pp = kzalloc(klen, GFP_KERNEL);
d8647b79
SK		 418 if (!pp) {
419 kfree(p);
420 return -ENOMEM;
421 }
422
ecd79187
MK		 423 memcpy(p, up, ulen);
424 memcpy(pp, up, ulen);
425
d8647b79
SK		 426 *replay_esn = p;
427 *preplay_esn = pp;
428
429 return 0;
430}
431
661697f7 432static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
df71837d 433{
df71837d
TJ		 434 int len = 0;
435
436 if (xfrm_ctx) {
437 len += sizeof(struct xfrm_user_sec_ctx);
438 len += xfrm_ctx->ctx_len;
439 }
440 return len;
441}
442
1da177e4
LT		 443static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
444{
445 memcpy(&x->id, &p->id, sizeof(x->id));
446 memcpy(&x->sel, &p->sel, sizeof(x->sel));
447 memcpy(&x->lft, &p->lft, sizeof(x->lft));
448 x->props.mode = p->mode;
449 x->props.replay_window = p->replay_window;
450 x->props.reqid = p->reqid;
451 x->props.family = p->family;
54489c14 452 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
1da177e4 453 x->props.flags = p->flags;
196b0036 454
ccf9b3b8 455 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
196b0036 456 x->sel.family = p->family;
1da177e4
LT		 457}
458
d51d081d
JHS		 459/*
460 * someday when pfkey also has support, we could have the code
461 * somehow made shareable and move it to xfrm_state.c - JHS
462 *
463*/
e3ac104d
MK		 464static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs,
465 int update_esn)
d51d081d 466{
5424f32e 467 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
e3ac104d 468 struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL;
5424f32e
TG		 469 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
470 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
471 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
d51d081d 472
d8647b79
SK		 473 if (re) {
474 struct xfrm_replay_state_esn *replay_esn;
475 replay_esn = nla_data(re);
476 memcpy(x->replay_esn, replay_esn,
477 xfrm_replay_state_esn_len(replay_esn));
478 memcpy(x->preplay_esn, replay_esn,
479 xfrm_replay_state_esn_len(replay_esn));
480 }
481
d51d081d
JHS		 482 if (rp) {
483 struct xfrm_replay_state *replay;
5424f32e 484 replay = nla_data(rp);
d51d081d
JHS		 485 memcpy(&x->replay, replay, sizeof(*replay));
486 memcpy(&x->preplay, replay, sizeof(*replay));
487 }
488
489 if (lt) {
490 struct xfrm_lifetime_cur *ltime;
5424f32e 491 ltime = nla_data(lt);
d51d081d
JHS		 492 x->curlft.bytes = ltime->bytes;
493 x->curlft.packets = ltime->packets;
494 x->curlft.add_time = ltime->add_time;
495 x->curlft.use_time = ltime->use_time;
496 }
497
cf5cb79f 498 if (et)
5424f32e 499 x->replay_maxage = nla_get_u32(et);
d51d081d 500
cf5cb79f 501 if (rt)
5424f32e 502 x->replay_maxdiff = nla_get_u32(rt);
d51d081d
JHS		 503}
504
fc34acd3
AD		 505static struct xfrm_state *xfrm_state_construct(struct net *net,
506 struct xfrm_usersa_info *p,
5424f32e 507 struct nlattr **attrs,
1da177e4
LT		 508 int *errp)
509{
fc34acd3 510 struct xfrm_state *x = xfrm_state_alloc(net);
1da177e4
LT		 511 int err = -ENOMEM;
512
513 if (!x)
514 goto error_no_put;
515
516 copy_from_user_state(x, p);
517
a947b0a9
ND		 518 if (attrs[XFRMA_SA_EXTRA_FLAGS])
519 x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]);
520
1a6509d9
HX		 521 if ((err = attach_aead(&x->aead, &x->props.ealgo,
522 attrs[XFRMA_ALG_AEAD])))
523 goto error;
4447bb33
MW		 524 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
525 attrs[XFRMA_ALG_AUTH_TRUNC])))
1da177e4 526 goto error;
4447bb33
MW		 527 if (!x->props.aalgo) {
528 if ((err = attach_auth(&x->aalg, &x->props.aalgo,
529 attrs[XFRMA_ALG_AUTH])))
530 goto error;
531 }
1da177e4
LT		 532 if ((err = attach_one_algo(&x->ealg, &x->props.ealgo,
533 xfrm_ealg_get_byname,
35a7aa08 534 attrs[XFRMA_ALG_CRYPT])))
1da177e4
LT		 535 goto error;
536 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
537 xfrm_calg_get_byname,
35a7aa08 538 attrs[XFRMA_ALG_COMP])))
1da177e4 539 goto error;
fd21150a
TG		 540
541 if (attrs[XFRMA_ENCAP]) {
542 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
543 sizeof(*x->encap), GFP_KERNEL);
544 if (x->encap == NULL)
545 goto error;
546 }
547
35d2856b
MW		 548 if (attrs[XFRMA_TFCPAD])
549 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);
550
fd21150a
TG		 551 if (attrs[XFRMA_COADDR]) {
552 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
553 sizeof(*x->coaddr), GFP_KERNEL);
554 if (x->coaddr == NULL)
555 goto error;
556 }
557
6f26b61e
JHS		 558 xfrm_mark_get(attrs, &x->mark);
559
a454f0cc 560 err = __xfrm_init_state(x, false);
1da177e4
LT		 561 if (err)
562 goto error;
563
fd21150a
TG		 564 if (attrs[XFRMA_SEC_CTX] &&
565 security_xfrm_state_alloc(x, nla_data(attrs[XFRMA_SEC_CTX])))
df71837d
TJ		 566 goto error;
567
d8647b79
SK		 568 if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn,
569 attrs[XFRMA_REPLAY_ESN_VAL])))
570 goto error;
571
1da177e4 572 x->km.seq = p->seq;
b27aeadb 573 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
d51d081d 574 /* sysctl_xfrm_aevent_etime is in 100ms units */
b27aeadb 575 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
d51d081d 576
9fdc4883
SK		 577 if ((err = xfrm_init_replay(x)))
578 goto error;
d51d081d 579
9fdc4883 580 /* override default values from above */
e3ac104d 581 xfrm_update_ae_params(x, attrs, 0);
1da177e4
LT		 582
583 return x;
584
585error:
586 x->km.state = XFRM_STATE_DEAD;
587 xfrm_state_put(x);
588error_no_put:
589 *errp = err;
590 return NULL;
591}
592
22e70050 593static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 594 struct nlattr **attrs)
1da177e4 595{
fc34acd3 596 struct net *net = sock_net(skb->sk);
7b67c857 597 struct xfrm_usersa_info *p = nlmsg_data(nlh);
1da177e4
LT		 598 struct xfrm_state *x;
599 int err;
26b15dad 600 struct km_event c;
e1760bd5 601 kuid_t loginuid = audit_get_loginuid(current);
c53fa1ed
PM		 602 u32 sessionid = audit_get_sessionid(current);
603 u32 sid;
1da177e4 604
35a7aa08 605 err = verify_newsa_info(p, attrs);
1da177e4
LT		 606 if (err)
607 return err;
608
fc34acd3 609 x = xfrm_state_construct(net, p, attrs, &err);
1da177e4
LT		 610 if (!x)
611 return err;
612
26b15dad 613 xfrm_state_hold(x);
1da177e4
LT		 614 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
615 err = xfrm_state_add(x);
616 else
617 err = xfrm_state_update(x);
618
c53fa1ed 619 security_task_getsecid(current, &sid);
2532386f 620 xfrm_audit_state_add(x, err ? 0 : 1, loginuid, sessionid, sid);
161a09e7 621
1da177e4
LT		 622 if (err < 0) {
623 x->km.state = XFRM_STATE_DEAD;
21380b81 624 __xfrm_state_put(x);
7d6dfe1f 625 goto out;
1da177e4
LT		 626 }
627
26b15dad 628 c.seq = nlh->nlmsg_seq;
15e47304 629 c.portid = nlh->nlmsg_pid;
f60f6b8f 630 c.event = nlh->nlmsg_type;
26b15dad
JHS		 631
632 km_state_notify(x, &c);
7d6dfe1f 633out:
26b15dad 634 xfrm_state_put(x);
1da177e4
LT		 635 return err;
636}
637
fc34acd3
AD		 638static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
639 struct xfrm_usersa_id *p,
5424f32e 640 struct nlattr **attrs,
eb2971b6
MN		 641 int *errp)
642{
643 struct xfrm_state *x = NULL;
6f26b61e 644 struct xfrm_mark m;
eb2971b6 645 int err;
6f26b61e 646 u32 mark = xfrm_mark_get(attrs, &m);
eb2971b6
MN		 647
648 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
649 err = -ESRCH;
6f26b61e 650 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);
eb2971b6
MN		 651 } else {
652 xfrm_address_t *saddr = NULL;
653
35a7aa08 654 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
eb2971b6
MN		 655 if (!saddr) {
656 err = -EINVAL;
657 goto out;
658 }
659
9abbffee 660 err = -ESRCH;
6f26b61e
JHS		 661 x = xfrm_state_lookup_byaddr(net, mark,
662 &p->daddr, saddr,
221df1ed 663 p->proto, p->family);
eb2971b6
MN		 664 }
665
666 out:
667 if (!x && errp)
668 *errp = err;
669 return x;
670}
671
22e70050 672static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 673 struct nlattr **attrs)
1da177e4 674{
fc34acd3 675 struct net *net = sock_net(skb->sk);
1da177e4 676 struct xfrm_state *x;
eb2971b6 677 int err = -ESRCH;
26b15dad 678 struct km_event c;
7b67c857 679 struct xfrm_usersa_id *p = nlmsg_data(nlh);
e1760bd5 680 kuid_t loginuid = audit_get_loginuid(current);
c53fa1ed
PM		 681 u32 sessionid = audit_get_sessionid(current);
682 u32 sid;
1da177e4 683
fc34acd3 684 x = xfrm_user_state_lookup(net, p, attrs, &err);
1da177e4 685 if (x == NULL)
eb2971b6 686 return err;
1da177e4 687
6f68dc37 688 if ((err = security_xfrm_state_delete(x)) != 0)
c8c05a8e
CZ		 689 goto out;
690
1da177e4 691 if (xfrm_state_kern(x)) {
c8c05a8e
CZ		 692 err = -EPERM;
693 goto out;
1da177e4
LT		 694 }
695
26b15dad 696 err = xfrm_state_delete(x);
161a09e7 697
c8c05a8e
CZ		 698 if (err < 0)
699 goto out;
26b15dad
JHS		 700
701 c.seq = nlh->nlmsg_seq;
15e47304 702 c.portid = nlh->nlmsg_pid;
f60f6b8f 703 c.event = nlh->nlmsg_type;
26b15dad 704 km_state_notify(x, &c);
1da177e4 705
c8c05a8e 706out:
c53fa1ed 707 security_task_getsecid(current, &sid);
2532386f 708 xfrm_audit_state_delete(x, err ? 0 : 1, loginuid, sessionid, sid);
c8c05a8e 709 xfrm_state_put(x);
26b15dad 710 return err;
1da177e4
LT		 711}
712
713static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
714{
f778a636 715 memset(p, 0, sizeof(*p));
1da177e4
LT		 716 memcpy(&p->id, &x->id, sizeof(p->id));
717 memcpy(&p->sel, &x->sel, sizeof(p->sel));
718 memcpy(&p->lft, &x->lft, sizeof(p->lft));
719 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
720 memcpy(&p->stats, &x->stats, sizeof(p->stats));
54489c14 721 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
1da177e4
LT		 722 p->mode = x->props.mode;
723 p->replay_window = x->props.replay_window;
724 p->reqid = x->props.reqid;
725 p->family = x->props.family;
726 p->flags = x->props.flags;
727 p->seq = x->km.seq;
728}
729
730struct xfrm_dump_info {
731 struct sk_buff *in_skb;
732 struct sk_buff *out_skb;
733 u32 nlmsg_seq;
734 u16 nlmsg_flags;
1da177e4
LT		 735};
736
c0144bea
TG		 737static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
738{
c0144bea
TG		 739 struct xfrm_user_sec_ctx *uctx;
740 struct nlattr *attr;
68325d3b 741 int ctx_size = sizeof(*uctx) + s->ctx_len;
c0144bea
TG		 742
743 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
744 if (attr == NULL)
745 return -EMSGSIZE;
746
747 uctx = nla_data(attr);
748 uctx->exttype = XFRMA_SEC_CTX;
749 uctx->len = ctx_size;
750 uctx->ctx_doi = s->ctx_doi;
751 uctx->ctx_alg = s->ctx_alg;
752 uctx->ctx_len = s->ctx_len;
753 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
754
755 return 0;
756}
757
4447bb33
MW		 758static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
759{
760 struct xfrm_algo *algo;
761 struct nlattr *nla;
762
763 nla = nla_reserve(skb, XFRMA_ALG_AUTH,
764 sizeof(*algo) + (auth->alg_key_len + 7) / 8);
765 if (!nla)
766 return -EMSGSIZE;
767
768 algo = nla_data(nla);
4c87308b 769 strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name));
4447bb33
MW		 770 memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8);
771 algo->alg_key_len = auth->alg_key_len;
772
773 return 0;
774}
775
68325d3b
HX		 776/* Don't change this without updating xfrm_sa_len! */
777static int copy_to_user_state_extra(struct xfrm_state *x,
778 struct xfrm_usersa_info *p,
779 struct sk_buff *skb)
1da177e4 780{
1d1e34dd 781 int ret = 0;
d0fde795 782
1d1e34dd 783 copy_to_user_state(x, p);
68325d3b 784
a947b0a9
ND		 785 if (x->props.extra_flags) {
786 ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS,
787 x->props.extra_flags);
788 if (ret)
789 goto out;
790 }
791
1d1e34dd
DM		 792 if (x->coaddr) {
793 ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
794 if (ret)
795 goto out;
796 }
797 if (x->lastused) {
798 ret = nla_put_u64(skb, XFRMA_LASTUSED, x->lastused);
799 if (ret)
800 goto out;
801 }
802 if (x->aead) {
803 ret = nla_put(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead);
804 if (ret)
805 goto out;
806 }
807 if (x->aalg) {
808 ret = copy_to_user_auth(x->aalg, skb);
809 if (!ret)
810 ret = nla_put(skb, XFRMA_ALG_AUTH_TRUNC,
811 xfrm_alg_auth_len(x->aalg), x->aalg);
812 if (ret)
813 goto out;
814 }
815 if (x->ealg) {
816 ret = nla_put(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg);
817 if (ret)
818 goto out;
819 }
820 if (x->calg) {
821 ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
822 if (ret)
823 goto out;
824 }
825 if (x->encap) {
826 ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
827 if (ret)
828 goto out;
829 }
830 if (x->tfcpad) {
831 ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad);
832 if (ret)
833 goto out;
834 }
835 ret = xfrm_mark_put(skb, &x->mark);
836 if (ret)
837 goto out;
838 if (x->replay_esn) {
839 ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
840 xfrm_replay_state_esn_len(x->replay_esn),
841 x->replay_esn);
842 if (ret)
843 goto out;
844 }
845 if (x->security)
846 ret = copy_sec_ctx(x->security, skb);
847out:
848 return ret;
68325d3b
HX		 849}
850
851static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
852{
853 struct xfrm_dump_info *sp = ptr;
854 struct sk_buff *in_skb = sp->in_skb;
855 struct sk_buff *skb = sp->out_skb;
856 struct xfrm_usersa_info *p;
857 struct nlmsghdr *nlh;
858 int err;
859
15e47304 860 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
68325d3b
HX		 861 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
862 if (nlh == NULL)
863 return -EMSGSIZE;
864
865 p = nlmsg_data(nlh);
866
867 err = copy_to_user_state_extra(x, p, skb);
1d1e34dd
DM		 868 if (err) {
869 nlmsg_cancel(skb, nlh);
870 return err;
871 }
9825069d 872 nlmsg_end(skb, nlh);
1da177e4 873 return 0;
1da177e4
LT		 874}
875
4c563f76
TT		 876static int xfrm_dump_sa_done(struct netlink_callback *cb)
877{
878 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
879 xfrm_state_walk_done(walk);
880 return 0;
881}
882
1da177e4
LT		 883static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
884{
fc34acd3 885 struct net *net = sock_net(skb->sk);
4c563f76 886 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
1da177e4
LT		 887 struct xfrm_dump_info info;
888
4c563f76
TT		 889 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
890 sizeof(cb->args) - sizeof(cb->args[0]));
891
1da177e4
LT		 892 info.in_skb = cb->skb;
893 info.out_skb = skb;
894 info.nlmsg_seq = cb->nlh->nlmsg_seq;
895 info.nlmsg_flags = NLM_F_MULTI;
4c563f76
TT		 896
897 if (!cb->args[0]) {
898 cb->args[0] = 1;
899 xfrm_state_walk_init(walk, 0);
900 }
901
fc34acd3 902 (void) xfrm_state_walk(net, walk, dump_one_state, &info);
1da177e4
LT		 903
904 return skb->len;
905}
906
907static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
908 struct xfrm_state *x, u32 seq)
909{
910 struct xfrm_dump_info info;
911 struct sk_buff *skb;
864745d2 912 int err;
1da177e4 913
7deb2264 914 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1da177e4
LT		 915 if (!skb)
916 return ERR_PTR(-ENOMEM);
917
1da177e4
LT		 918 info.in_skb = in_skb;
919 info.out_skb = skb;
920 info.nlmsg_seq = seq;
921 info.nlmsg_flags = 0;
1da177e4 922
864745d2
MK		 923 err = dump_one_state(x, 0, &info);
924 if (err) {
1da177e4 925 kfree_skb(skb);
864745d2 926 return ERR_PTR(err);
1da177e4
LT		 927 }
928
929 return skb;
930}
931
7deb2264
TG		 932static inline size_t xfrm_spdinfo_msgsize(void)
933{
934 return NLMSG_ALIGN(4)
935 + nla_total_size(sizeof(struct xfrmu_spdinfo))
936 + nla_total_size(sizeof(struct xfrmu_spdhinfo));
937}
938
e071041b 939static int build_spdinfo(struct sk_buff *skb, struct net *net,
15e47304 940 u32 portid, u32 seq, u32 flags)
ecfd6b18 941{
5a6d3416
JHS		 942 struct xfrmk_spdinfo si;
943 struct xfrmu_spdinfo spc;
944 struct xfrmu_spdhinfo sph;
ecfd6b18 945 struct nlmsghdr *nlh;
1d1e34dd 946 int err;
ecfd6b18
JHS		 947 u32 *f;
948
15e47304 949 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
25985edc 950 if (nlh == NULL) /* shouldn't really happen ... */
ecfd6b18
JHS		 951 return -EMSGSIZE;
952
953 f = nlmsg_data(nlh);
954 *f = flags;
e071041b 955 xfrm_spd_getinfo(net, &si);
5a6d3416
JHS		 956 spc.incnt = si.incnt;
957 spc.outcnt = si.outcnt;
958 spc.fwdcnt = si.fwdcnt;
959 spc.inscnt = si.inscnt;
960 spc.outscnt = si.outscnt;
961 spc.fwdscnt = si.fwdscnt;
962 sph.spdhcnt = si.spdhcnt;
963 sph.spdhmcnt = si.spdhmcnt;
964
1d1e34dd
DM		 965 err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
966 if (!err)
967 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
968 if (err) {
969 nlmsg_cancel(skb, nlh);
970 return err;
971 }
ecfd6b18
JHS		 972
973 return nlmsg_end(skb, nlh);
ecfd6b18
JHS		 974}
975
976static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 977 struct nlattr **attrs)
ecfd6b18 978{
a6483b79 979 struct net *net = sock_net(skb->sk);
ecfd6b18 980 struct sk_buff *r_skb;
7b67c857 981 u32 *flags = nlmsg_data(nlh);
15e47304 982 u32 sportid = NETLINK_CB(skb).portid;
ecfd6b18 983 u32 seq = nlh->nlmsg_seq;
ecfd6b18 984
7deb2264 985 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
ecfd6b18
JHS		 986 if (r_skb == NULL)
987 return -ENOMEM;
988
15e47304 989 if (build_spdinfo(r_skb, net, sportid, seq, *flags) < 0)
ecfd6b18
JHS		 990 BUG();
991
15e47304 992 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
ecfd6b18
JHS		 993}
994
7deb2264
TG		 995static inline size_t xfrm_sadinfo_msgsize(void)
996{
997 return NLMSG_ALIGN(4)
998 + nla_total_size(sizeof(struct xfrmu_sadhinfo))
999 + nla_total_size(4); /* XFRMA_SAD_CNT */
1000}
1001
e071041b 1002static int build_sadinfo(struct sk_buff *skb, struct net *net,
15e47304 1003 u32 portid, u32 seq, u32 flags)
28d8909b 1004{
af11e316
JHS		 1005 struct xfrmk_sadinfo si;
1006 struct xfrmu_sadhinfo sh;
28d8909b 1007 struct nlmsghdr *nlh;
1d1e34dd 1008 int err;
28d8909b
JHS		 1009 u32 *f;
1010
15e47304 1011 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
25985edc 1012 if (nlh == NULL) /* shouldn't really happen ... */
28d8909b
JHS		 1013 return -EMSGSIZE;
1014
1015 f = nlmsg_data(nlh);
1016 *f = flags;
e071041b 1017 xfrm_sad_getinfo(net, &si);
28d8909b 1018
af11e316
JHS		 1019 sh.sadhmcnt = si.sadhmcnt;
1020 sh.sadhcnt = si.sadhcnt;
1021
1d1e34dd
DM		 1022 err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt);
1023 if (!err)
1024 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
1025 if (err) {
1026 nlmsg_cancel(skb, nlh);
1027 return err;
1028 }
28d8909b
JHS		 1029
1030 return nlmsg_end(skb, nlh);
28d8909b
JHS		 1031}
1032
1033static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1034 struct nlattr **attrs)
28d8909b 1035{
a6483b79 1036 struct net *net = sock_net(skb->sk);
28d8909b 1037 struct sk_buff *r_skb;
7b67c857 1038 u32 *flags = nlmsg_data(nlh);
15e47304 1039 u32 sportid = NETLINK_CB(skb).portid;
28d8909b 1040 u32 seq = nlh->nlmsg_seq;
28d8909b 1041
7deb2264 1042 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
28d8909b
JHS		 1043 if (r_skb == NULL)
1044 return -ENOMEM;
1045
15e47304 1046 if (build_sadinfo(r_skb, net, sportid, seq, *flags) < 0)
28d8909b
JHS		 1047 BUG();
1048
15e47304 1049 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
28d8909b
JHS		 1050}
1051
22e70050 1052static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1053 struct nlattr **attrs)
1da177e4 1054{
fc34acd3 1055 struct net *net = sock_net(skb->sk);
7b67c857 1056 struct xfrm_usersa_id *p = nlmsg_data(nlh);
1da177e4
LT		 1057 struct xfrm_state *x;
1058 struct sk_buff *resp_skb;
eb2971b6 1059 int err = -ESRCH;
1da177e4 1060
fc34acd3 1061 x = xfrm_user_state_lookup(net, p, attrs, &err);
1da177e4
LT		 1062 if (x == NULL)
1063 goto out_noput;
1064
1065 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1066 if (IS_ERR(resp_skb)) {
1067 err = PTR_ERR(resp_skb);
1068 } else {
15e47304 1069 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1da177e4
LT		 1070 }
1071 xfrm_state_put(x);
1072out_noput:
1073 return err;
1074}
1075
1076static int verify_userspi_info(struct xfrm_userspi_info *p)
1077{
1078 switch (p->info.id.proto) {
1079 case IPPROTO_AH:
1080 case IPPROTO_ESP:
1081 break;
1082
1083 case IPPROTO_COMP:
1084 /* IPCOMP spi is 16-bits. */
1085 if (p->max >= 0x10000)
1086 return -EINVAL;
1087 break;
1088
1089 default:
1090 return -EINVAL;
3ff50b79 1091 }
1da177e4
LT		 1092
1093 if (p->min > p->max)
1094 return -EINVAL;
1095
1096 return 0;
1097}
1098
22e70050 1099static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1100 struct nlattr **attrs)
1da177e4 1101{
fc34acd3 1102 struct net *net = sock_net(skb->sk);
1da177e4
LT		 1103 struct xfrm_state *x;
1104 struct xfrm_userspi_info *p;
1105 struct sk_buff *resp_skb;
1106 xfrm_address_t *daddr;
1107 int family;
1108 int err;
6f26b61e
JHS		 1109 u32 mark;
1110 struct xfrm_mark m;
1da177e4 1111
7b67c857 1112 p = nlmsg_data(nlh);
1da177e4
LT		 1113 err = verify_userspi_info(p);
1114 if (err)
1115 goto out_noput;
1116
1117 family = p->info.family;
1118 daddr = &p->info.id.daddr;
1119
1120 x = NULL;
6f26b61e
JHS		 1121
1122 mark = xfrm_mark_get(attrs, &m);
1da177e4 1123 if (p->info.seq) {
6f26b61e 1124 x = xfrm_find_acq_byseq(net, mark, p->info.seq);
70e94e66 1125 if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) {
1da177e4
LT		 1126 xfrm_state_put(x);
1127 x = NULL;
1128 }
1129 }
1130
1131 if (!x)
6f26b61e 1132 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1da177e4
LT		 1133 p->info.id.proto, daddr,
1134 &p->info.saddr, 1,
1135 family);
1136 err = -ENOENT;
1137 if (x == NULL)
1138 goto out_noput;
1139
658b219e
HX		 1140 err = xfrm_alloc_spi(x, p->min, p->max);
1141 if (err)
1142 goto out;
1da177e4 1143
658b219e 1144 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1da177e4
LT		 1145 if (IS_ERR(resp_skb)) {
1146 err = PTR_ERR(resp_skb);
1147 goto out;
1148 }
1149
15e47304 1150 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1da177e4
LT		 1151
1152out:
1153 xfrm_state_put(x);
1154out_noput:
1155 return err;
1156}
1157
b798a9ed 1158static int verify_policy_dir(u8 dir)
1da177e4
LT		 1159{
1160 switch (dir) {
1161 case XFRM_POLICY_IN:
1162 case XFRM_POLICY_OUT:
1163 case XFRM_POLICY_FWD:
1164 break;
1165
1166 default:
1167 return -EINVAL;
3ff50b79 1168 }
1da177e4
LT		 1169
1170 return 0;
1171}
1172
b798a9ed 1173static int verify_policy_type(u8 type)
f7b6983f
MN		 1174{
1175 switch (type) {
1176 case XFRM_POLICY_TYPE_MAIN:
1177#ifdef CONFIG_XFRM_SUB_POLICY
1178 case XFRM_POLICY_TYPE_SUB:
1179#endif
1180 break;
1181
1182 default:
1183 return -EINVAL;
3ff50b79 1184 }
f7b6983f
MN		 1185
1186 return 0;
1187}
1188
1da177e4
LT		 1189static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
1190{
1191 switch (p->share) {
1192 case XFRM_SHARE_ANY:
1193 case XFRM_SHARE_SESSION:
1194 case XFRM_SHARE_USER:
1195 case XFRM_SHARE_UNIQUE:
1196 break;
1197
1198 default:
1199 return -EINVAL;
3ff50b79 1200 }
1da177e4
LT		 1201
1202 switch (p->action) {
1203 case XFRM_POLICY_ALLOW:
1204 case XFRM_POLICY_BLOCK:
1205 break;
1206
1207 default:
1208 return -EINVAL;
3ff50b79 1209 }
1da177e4
LT		 1210
1211 switch (p->sel.family) {
1212 case AF_INET:
1213 break;
1214
1215 case AF_INET6:
dfd56b8b 1216#if IS_ENABLED(CONFIG_IPV6)
1da177e4
LT		 1217 break;
1218#else
1219 return -EAFNOSUPPORT;
1220#endif
1221
1222 default:
1223 return -EINVAL;
3ff50b79 1224 }
1da177e4
LT		 1225
1226 return verify_policy_dir(p->dir);
1227}
1228
5424f32e 1229static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
df71837d 1230{
5424f32e 1231 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
df71837d
TJ		 1232 struct xfrm_user_sec_ctx *uctx;
1233
1234 if (!rt)
1235 return 0;
1236
5424f32e 1237 uctx = nla_data(rt);
03e1ad7b 1238 return security_xfrm_policy_alloc(&pol->security, uctx);
df71837d
TJ		 1239}
1240
1da177e4
LT		 1241static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1242 int nr)
1243{
1244 int i;
1245
1246 xp->xfrm_nr = nr;
1247 for (i = 0; i < nr; i++, ut++) {
1248 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1249
1250 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1251 memcpy(&t->saddr, &ut->saddr,
1252 sizeof(xfrm_address_t));
1253 t->reqid = ut->reqid;
1254 t->mode = ut->mode;
1255 t->share = ut->share;
1256 t->optional = ut->optional;
1257 t->aalgos = ut->aalgos;
1258 t->ealgos = ut->ealgos;
1259 t->calgos = ut->calgos;
c5d18e98
HX		 1260 /* If all masks are ~0, then we allow all algorithms. */
1261 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
8511d01d 1262 t->encap_family = ut->family;
1da177e4
LT		 1263 }
1264}
1265
b4ad86bf
DM		 1266static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
1267{
1268 int i;
1269
1270 if (nr > XFRM_MAX_DEPTH)
1271 return -EINVAL;
1272
1273 for (i = 0; i < nr; i++) {
1274 /* We never validated the ut->family value, so many
1275 * applications simply leave it at zero. The check was
1276 * never made and ut->family was ignored because all
1277 * templates could be assumed to have the same family as
1278 * the policy itself. Now that we will have ipv4-in-ipv6
1279 * and ipv6-in-ipv4 tunnels, this is no longer true.
1280 */
1281 if (!ut[i].family)
1282 ut[i].family = family;
1283
1284 switch (ut[i].family) {
1285 case AF_INET:
1286 break;
dfd56b8b 1287#if IS_ENABLED(CONFIG_IPV6)
b4ad86bf
DM		 1288 case AF_INET6:
1289 break;
1290#endif
1291 default:
1292 return -EINVAL;
3ff50b79 1293 }
b4ad86bf
DM		 1294 }
1295
1296 return 0;
1297}
1298
5424f32e 1299static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1da177e4 1300{
5424f32e 1301 struct nlattr *rt = attrs[XFRMA_TMPL];
1da177e4
LT		 1302
1303 if (!rt) {
1304 pol->xfrm_nr = 0;
1305 } else {
5424f32e
TG		 1306 struct xfrm_user_tmpl *utmpl = nla_data(rt);
1307 int nr = nla_len(rt) / sizeof(*utmpl);
b4ad86bf 1308 int err;
1da177e4 1309
b4ad86bf
DM		 1310 err = validate_tmpl(nr, utmpl, pol->family);
1311 if (err)
1312 return err;
1da177e4 1313
5424f32e 1314 copy_templates(pol, utmpl, nr);
1da177e4
LT		 1315 }
1316 return 0;
1317}
1318
5424f32e 1319static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
f7b6983f 1320{
5424f32e 1321 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
f7b6983f 1322 struct xfrm_userpolicy_type *upt;
b798a9ed 1323 u8 type = XFRM_POLICY_TYPE_MAIN;
f7b6983f
MN		 1324 int err;
1325
1326 if (rt) {
5424f32e 1327 upt = nla_data(rt);
f7b6983f
MN		 1328 type = upt->type;
1329 }
1330
1331 err = verify_policy_type(type);
1332 if (err)
1333 return err;
1334
1335 *tp = type;
1336 return 0;
1337}
1338
1da177e4
LT		 1339static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1340{
1341 xp->priority = p->priority;
1342 xp->index = p->index;
1343 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1344 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1345 xp->action = p->action;
1346 xp->flags = p->flags;
1347 xp->family = p->sel.family;
1348 /* XXX xp->share = p->share; */
1349}
1350
1351static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1352{
7b789836 1353 memset(p, 0, sizeof(*p));
1da177e4
LT		 1354 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1355 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1356 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1357 p->priority = xp->priority;
1358 p->index = xp->index;
1359 p->sel.family = xp->family;
1360 p->dir = dir;
1361 p->action = xp->action;
1362 p->flags = xp->flags;
1363 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1364}
1365
fc34acd3 1366static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1da177e4 1367{
fc34acd3 1368 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
1da177e4
LT		 1369 int err;
1370
1371 if (!xp) {
1372 *errp = -ENOMEM;
1373 return NULL;
1374 }
1375
1376 copy_from_user_policy(xp, p);
df71837d 1377
35a7aa08 1378 err = copy_from_user_policy_type(&xp->type, attrs);
f7b6983f
MN		 1379 if (err)
1380 goto error;
1381
35a7aa08
TG		 1382 if (!(err = copy_from_user_tmpl(xp, attrs)))
1383 err = copy_from_user_sec_ctx(xp, attrs);
f7b6983f
MN		 1384 if (err)
1385 goto error;
1da177e4 1386
295fae56
JHS		 1387 xfrm_mark_get(attrs, &xp->mark);
1388
1da177e4 1389 return xp;
f7b6983f
MN		 1390 error:
1391 *errp = err;
12a169e7 1392 xp->walk.dead = 1;
64c31b3f 1393 xfrm_policy_destroy(xp);
f7b6983f 1394 return NULL;
1da177e4
LT		 1395}
1396
22e70050 1397static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1398 struct nlattr **attrs)
1da177e4 1399{
fc34acd3 1400 struct net *net = sock_net(skb->sk);
7b67c857 1401 struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1da177e4 1402 struct xfrm_policy *xp;
26b15dad 1403 struct km_event c;
1da177e4
LT		 1404 int err;
1405 int excl;
e1760bd5 1406 kuid_t loginuid = audit_get_loginuid(current);
c53fa1ed
PM		 1407 u32 sessionid = audit_get_sessionid(current);
1408 u32 sid;
1da177e4
LT		 1409
1410 err = verify_newpolicy_info(p);
df71837d
TJ		 1411 if (err)
1412 return err;
35a7aa08 1413 err = verify_sec_ctx_len(attrs);
1da177e4
LT		 1414 if (err)
1415 return err;
1416
fc34acd3 1417 xp = xfrm_policy_construct(net, p, attrs, &err);
1da177e4
LT		 1418 if (!xp)
1419 return err;
1420
25985edc 1421 /* shouldn't excl be based on nlh flags??
26b15dad
JHS		 1422 * Aha! this is anti-netlink really i.e more pfkey derived
1423 * in netlink excl is a flag and you wouldnt need
1424 * a type XFRM_MSG_UPDPOLICY - JHS */
1da177e4
LT		 1425 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1426 err = xfrm_policy_insert(p->dir, xp, excl);
c53fa1ed 1427 security_task_getsecid(current, &sid);
2532386f 1428 xfrm_audit_policy_add(xp, err ? 0 : 1, loginuid, sessionid, sid);
161a09e7 1429
1da177e4 1430 if (err) {
03e1ad7b 1431 security_xfrm_policy_free(xp->security);
1da177e4
LT		 1432 kfree(xp);
1433 return err;
1434 }
1435
f60f6b8f 1436 c.event = nlh->nlmsg_type;
26b15dad 1437 c.seq = nlh->nlmsg_seq;
15e47304 1438 c.portid = nlh->nlmsg_pid;
26b15dad
JHS		 1439 km_policy_notify(xp, p->dir, &c);
1440
1da177e4
LT		 1441 xfrm_pol_put(xp);
1442
1443 return 0;
1444}
1445
1446static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1447{
1448 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1449 int i;
1450
1451 if (xp->xfrm_nr == 0)
1452 return 0;
1453
1454 for (i = 0; i < xp->xfrm_nr; i++) {
1455 struct xfrm_user_tmpl *up = &vec[i];
1456 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1457
1f86840f 1458 memset(up, 0, sizeof(*up));
1da177e4 1459 memcpy(&up->id, &kp->id, sizeof(up->id));
8511d01d 1460 up->family = kp->encap_family;
1da177e4
LT		 1461 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1462 up->reqid = kp->reqid;
1463 up->mode = kp->mode;
1464 up->share = kp->share;
1465 up->optional = kp->optional;
1466 up->aalgos = kp->aalgos;
1467 up->ealgos = kp->ealgos;
1468 up->calgos = kp->calgos;
1469 }
df71837d 1470
c0144bea
TG		 1471 return nla_put(skb, XFRMA_TMPL,
1472 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
0d681623
SH		 1473}
1474
1475static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1476{
1477 if (x->security) {
1478 return copy_sec_ctx(x->security, skb);
df71837d
TJ		 1479 }
1480 return 0;
0d681623 1481}
df71837d 1482
0d681623
SH		 1483static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1484{
1d1e34dd 1485 if (xp->security)
0d681623 1486 return copy_sec_ctx(xp->security, skb);
0d681623 1487 return 0;
df71837d 1488}
cfbfd45a
TG		 1489static inline size_t userpolicy_type_attrsize(void)
1490{
1491#ifdef CONFIG_XFRM_SUB_POLICY
1492 return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1493#else
1494 return 0;
1495#endif
1496}
df71837d 1497
f7b6983f 1498#ifdef CONFIG_XFRM_SUB_POLICY
b798a9ed 1499static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
f7b6983f 1500{
c0144bea
TG		 1501 struct xfrm_userpolicy_type upt = {
1502 .type = type,
1503 };
f7b6983f 1504
c0144bea 1505 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
f7b6983f
MN		 1506}
1507
1508#else
b798a9ed 1509static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
f7b6983f
MN		 1510{
1511 return 0;
1512}
1513#endif
1514
1da177e4
LT		 1515static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1516{
1517 struct xfrm_dump_info *sp = ptr;
1518 struct xfrm_userpolicy_info *p;
1519 struct sk_buff *in_skb = sp->in_skb;
1520 struct sk_buff *skb = sp->out_skb;
1521 struct nlmsghdr *nlh;
1d1e34dd 1522 int err;
1da177e4 1523
15e47304 1524 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
79b8b7f4
TG		 1525 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1526 if (nlh == NULL)
1527 return -EMSGSIZE;
1da177e4 1528
7b67c857 1529 p = nlmsg_data(nlh);
1da177e4 1530 copy_to_user_policy(xp, p, dir);
1d1e34dd
DM		 1531 err = copy_to_user_tmpl(xp, skb);
1532 if (!err)
1533 err = copy_to_user_sec_ctx(xp, skb);
1534 if (!err)
1535 err = copy_to_user_policy_type(xp->type, skb);
1536 if (!err)
1537 err = xfrm_mark_put(skb, &xp->mark);
1538 if (err) {
1539 nlmsg_cancel(skb, nlh);
1540 return err;
1541 }
9825069d 1542 nlmsg_end(skb, nlh);
1da177e4 1543 return 0;
1da177e4
LT		 1544}
1545
4c563f76
TT		 1546static int xfrm_dump_policy_done(struct netlink_callback *cb)
1547{
1548 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1549
1550 xfrm_policy_walk_done(walk);
1551 return 0;
1552}
1553
1da177e4
LT		 1554static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1555{
fc34acd3 1556 struct net *net = sock_net(skb->sk);
4c563f76 1557 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1da177e4
LT		 1558 struct xfrm_dump_info info;
1559
4c563f76
TT		 1560 BUILD_BUG_ON(sizeof(struct xfrm_policy_walk) >
1561 sizeof(cb->args) - sizeof(cb->args[0]));
1562
1da177e4
LT		 1563 info.in_skb = cb->skb;
1564 info.out_skb = skb;
1565 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1566 info.nlmsg_flags = NLM_F_MULTI;
4c563f76
TT		 1567
1568 if (!cb->args[0]) {
1569 cb->args[0] = 1;
1570 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1571 }
1572
fc34acd3 1573 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
1da177e4
LT		 1574
1575 return skb->len;
1576}
1577
1578static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1579 struct xfrm_policy *xp,
1580 int dir, u32 seq)
1581{
1582 struct xfrm_dump_info info;
1583 struct sk_buff *skb;
c2546372 1584 int err;
1da177e4 1585
7deb2264 1586 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1da177e4
LT		 1587 if (!skb)
1588 return ERR_PTR(-ENOMEM);
1589
1da177e4
LT		 1590 info.in_skb = in_skb;
1591 info.out_skb = skb;
1592 info.nlmsg_seq = seq;
1593 info.nlmsg_flags = 0;
1da177e4 1594
c2546372
MK		 1595 err = dump_one_policy(xp, dir, 0, &info);
1596 if (err) {
1da177e4 1597 kfree_skb(skb);
c2546372 1598 return ERR_PTR(err);
1da177e4
LT		 1599 }
1600
1601 return skb;
1602}
1603
22e70050 1604static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1605 struct nlattr **attrs)
1da177e4 1606{
fc34acd3 1607 struct net *net = sock_net(skb->sk);
1da177e4
LT		 1608 struct xfrm_policy *xp;
1609 struct xfrm_userpolicy_id *p;
b798a9ed 1610 u8 type = XFRM_POLICY_TYPE_MAIN;
1da177e4 1611 int err;
26b15dad 1612 struct km_event c;
1da177e4 1613 int delete;
295fae56
JHS		 1614 struct xfrm_mark m;
1615 u32 mark = xfrm_mark_get(attrs, &m);
1da177e4 1616
7b67c857 1617 p = nlmsg_data(nlh);
1da177e4
LT		 1618 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1619
35a7aa08 1620 err = copy_from_user_policy_type(&type, attrs);
f7b6983f
MN		 1621 if (err)
1622 return err;
1623
1da177e4
LT		 1624 err = verify_policy_dir(p->dir);
1625 if (err)
1626 return err;
1627
1628 if (p->index)
295fae56 1629 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err);
df71837d 1630 else {
5424f32e 1631 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
03e1ad7b 1632 struct xfrm_sec_ctx *ctx;
df71837d 1633
35a7aa08 1634 err = verify_sec_ctx_len(attrs);
df71837d
TJ		 1635 if (err)
1636 return err;
1637
2c8dd116 1638 ctx = NULL;
df71837d 1639 if (rt) {
5424f32e 1640 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
df71837d 1641
03e1ad7b
PM		 1642 err = security_xfrm_policy_alloc(&ctx, uctx);
1643 if (err)
df71837d 1644 return err;
2c8dd116 1645 }
295fae56 1646 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel,
6f26b61e 1647 ctx, delete, &err);
03e1ad7b 1648 security_xfrm_policy_free(ctx);
df71837d 1649 }
1da177e4
LT		 1650 if (xp == NULL)
1651 return -ENOENT;
1652
1653 if (!delete) {
1654 struct sk_buff *resp_skb;
1655
1656 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1657 if (IS_ERR(resp_skb)) {
1658 err = PTR_ERR(resp_skb);
1659 } else {
a6483b79 1660 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
15e47304 1661 NETLINK_CB(skb).portid);
1da177e4 1662 }
26b15dad 1663 } else {
e1760bd5 1664 kuid_t loginuid = audit_get_loginuid(current);
c53fa1ed
PM		 1665 u32 sessionid = audit_get_sessionid(current);
1666 u32 sid;
2532386f 1667
c53fa1ed 1668 security_task_getsecid(current, &sid);
2532386f
EP		 1669 xfrm_audit_policy_delete(xp, err ? 0 : 1, loginuid, sessionid,
1670 sid);
13fcfbb0
DM		 1671
1672 if (err != 0)
c8c05a8e 1673 goto out;
13fcfbb0 1674
e7443892 1675 c.data.byid = p->index;
f60f6b8f 1676 c.event = nlh->nlmsg_type;
26b15dad 1677 c.seq = nlh->nlmsg_seq;
15e47304 1678 c.portid = nlh->nlmsg_pid;
26b15dad 1679 km_policy_notify(xp, p->dir, &c);
1da177e4
LT		 1680 }
1681
c8c05a8e 1682out:
ef41aaa0 1683 xfrm_pol_put(xp);
1da177e4
LT		 1684 return err;
1685}
1686
22e70050 1687static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1688 struct nlattr **attrs)
1da177e4 1689{
fc34acd3 1690 struct net *net = sock_net(skb->sk);
26b15dad 1691 struct km_event c;
7b67c857 1692 struct xfrm_usersa_flush *p = nlmsg_data(nlh);
161a09e7 1693 struct xfrm_audit audit_info;
4aa2e62c 1694 int err;
1da177e4 1695
c53fa1ed
PM		 1696 audit_info.loginuid = audit_get_loginuid(current);
1697 audit_info.sessionid = audit_get_sessionid(current);
1698 security_task_getsecid(current, &audit_info.secid);
fc34acd3 1699 err = xfrm_state_flush(net, p->proto, &audit_info);
9e64cc95
JHS		 1700 if (err) {
1701 if (err == -ESRCH) /* empty table */
1702 return 0;
069c474e 1703 return err;
9e64cc95 1704 }
bf08867f 1705 c.data.proto = p->proto;
f60f6b8f 1706 c.event = nlh->nlmsg_type;
26b15dad 1707 c.seq = nlh->nlmsg_seq;
15e47304 1708 c.portid = nlh->nlmsg_pid;
7067802e 1709 c.net = net;
26b15dad
JHS		 1710 km_state_notify(NULL, &c);
1711
1da177e4
LT		 1712 return 0;
1713}
1714
d8647b79 1715static inline size_t xfrm_aevent_msgsize(struct xfrm_state *x)
7deb2264 1716{
d8647b79
SK		 1717 size_t replay_size = x->replay_esn ?
1718 xfrm_replay_state_esn_len(x->replay_esn) :
1719 sizeof(struct xfrm_replay_state);
1720
7deb2264 1721 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
d8647b79 1722 + nla_total_size(replay_size)
7deb2264 1723 + nla_total_size(sizeof(struct xfrm_lifetime_cur))
6f26b61e 1724 + nla_total_size(sizeof(struct xfrm_mark))
7deb2264
TG		 1725 + nla_total_size(4) /* XFRM_AE_RTHR */
1726 + nla_total_size(4); /* XFRM_AE_ETHR */
1727}
d51d081d 1728
214e005b 1729static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
d51d081d
JHS		 1730{
1731 struct xfrm_aevent_id *id;
1732 struct nlmsghdr *nlh;
1d1e34dd 1733 int err;
d51d081d 1734
15e47304 1735 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
79b8b7f4
TG		 1736 if (nlh == NULL)
1737 return -EMSGSIZE;
d51d081d 1738
7b67c857 1739 id = nlmsg_data(nlh);
2b5f6dcc 1740 memcpy(&id->sa_id.daddr, &x->id.daddr,sizeof(x->id.daddr));
d51d081d
JHS		 1741 id->sa_id.spi = x->id.spi;
1742 id->sa_id.family = x->props.family;
1743 id->sa_id.proto = x->id.proto;
2b5f6dcc
JHS		 1744 memcpy(&id->saddr, &x->props.saddr,sizeof(x->props.saddr));
1745 id->reqid = x->props.reqid;
d51d081d
JHS		 1746 id->flags = c->data.aevent;
1747
d0fde795 1748 if (x->replay_esn) {
1d1e34dd
DM		 1749 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
1750 xfrm_replay_state_esn_len(x->replay_esn),
1751 x->replay_esn);
d0fde795 1752 } else {
1d1e34dd
DM		 1753 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
1754 &x->replay);
d0fde795 1755 }
1d1e34dd
DM		 1756 if (err)
1757 goto out_cancel;
1758 err = nla_put(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft);
1759 if (err)
1760 goto out_cancel;
d51d081d 1761
1d1e34dd
DM		 1762 if (id->flags & XFRM_AE_RTHR) {
1763 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
1764 if (err)
1765 goto out_cancel;
1766 }
1767 if (id->flags & XFRM_AE_ETHR) {
1768 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH,
1769 x->replay_maxage * 10 / HZ);
1770 if (err)
1771 goto out_cancel;
1772 }
1773 err = xfrm_mark_put(skb, &x->mark);
1774 if (err)
1775 goto out_cancel;
6f26b61e 1776
9825069d 1777 return nlmsg_end(skb, nlh);
d51d081d 1778
1d1e34dd 1779out_cancel:
9825069d 1780 nlmsg_cancel(skb, nlh);
1d1e34dd 1781 return err;
d51d081d
JHS		 1782}
1783
22e70050 1784static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1785 struct nlattr **attrs)
d51d081d 1786{
fc34acd3 1787 struct net *net = sock_net(skb->sk);
d51d081d
JHS		 1788 struct xfrm_state *x;
1789 struct sk_buff *r_skb;
1790 int err;
1791 struct km_event c;
6f26b61e
JHS		 1792 u32 mark;
1793 struct xfrm_mark m;
7b67c857 1794 struct xfrm_aevent_id *p = nlmsg_data(nlh);
d51d081d
JHS		 1795 struct xfrm_usersa_id *id = &p->sa_id;
1796
6f26b61e
JHS		 1797 mark = xfrm_mark_get(attrs, &m);
1798
1799 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
d8647b79 1800 if (x == NULL)
d51d081d 1801 return -ESRCH;
d8647b79
SK		 1802
1803 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
1804 if (r_skb == NULL) {
1805 xfrm_state_put(x);
1806 return -ENOMEM;
d51d081d
JHS		 1807 }
1808
1809 /*
1810 * XXX: is this lock really needed - none of the other
1811 * gets lock (the concern is things getting updated
1812 * while we are still reading) - jhs
1813 */
1814 spin_lock_bh(&x->lock);
1815 c.data.aevent = p->flags;
1816 c.seq = nlh->nlmsg_seq;
15e47304 1817 c.portid = nlh->nlmsg_pid;
d51d081d
JHS		 1818
1819 if (build_aevent(r_skb, x, &c) < 0)
1820 BUG();
15e47304 1821 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid);
d51d081d
JHS		 1822 spin_unlock_bh(&x->lock);
1823 xfrm_state_put(x);
1824 return err;
1825}
1826
22e70050 1827static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1828 struct nlattr **attrs)
d51d081d 1829{
fc34acd3 1830 struct net *net = sock_net(skb->sk);
d51d081d
JHS		 1831 struct xfrm_state *x;
1832 struct km_event c;
1833 int err = - EINVAL;
6f26b61e
JHS		 1834 u32 mark = 0;
1835 struct xfrm_mark m;
7b67c857 1836 struct xfrm_aevent_id *p = nlmsg_data(nlh);
5424f32e 1837 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
d8647b79 1838 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
5424f32e 1839 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
d51d081d 1840
d8647b79 1841 if (!lt && !rp && !re)
d51d081d
JHS		 1842 return err;
1843
1844 /* pedantic mode - thou shalt sayeth replaceth */
1845 if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
1846 return err;
1847
6f26b61e
JHS		 1848 mark = xfrm_mark_get(attrs, &m);
1849
1850 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
d51d081d
JHS		 1851 if (x == NULL)
1852 return -ESRCH;
1853
1854 if (x->km.state != XFRM_STATE_VALID)
1855 goto out;
1856
e2b19125
SK		 1857 err = xfrm_replay_verify_len(x->replay_esn, rp);
1858 if (err)
1859 goto out;
1860
d51d081d 1861 spin_lock_bh(&x->lock);
e3ac104d 1862 xfrm_update_ae_params(x, attrs, 1);
d51d081d 1863 spin_unlock_bh(&x->lock);
d51d081d
JHS		 1864
1865 c.event = nlh->nlmsg_type;
1866 c.seq = nlh->nlmsg_seq;
15e47304 1867 c.portid = nlh->nlmsg_pid;
d51d081d
JHS		 1868 c.data.aevent = XFRM_AE_CU;
1869 km_state_notify(x, &c);
1870 err = 0;
1871out:
1872 xfrm_state_put(x);
1873 return err;
1874}
1875
22e70050 1876static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1877 struct nlattr **attrs)
1da177e4 1878{
fc34acd3 1879 struct net *net = sock_net(skb->sk);
f7b6983f 1880 struct km_event c;
b798a9ed 1881 u8 type = XFRM_POLICY_TYPE_MAIN;
f7b6983f 1882 int err;
161a09e7 1883 struct xfrm_audit audit_info;
f7b6983f 1884
35a7aa08 1885 err = copy_from_user_policy_type(&type, attrs);
f7b6983f
MN		 1886 if (err)
1887 return err;
26b15dad 1888
c53fa1ed
PM		 1889 audit_info.loginuid = audit_get_loginuid(current);
1890 audit_info.sessionid = audit_get_sessionid(current);
1891 security_task_getsecid(current, &audit_info.secid);
fc34acd3 1892 err = xfrm_policy_flush(net, type, &audit_info);
2f1eb65f
JHS		 1893 if (err) {
1894 if (err == -ESRCH) /* empty table */
1895 return 0;
069c474e 1896 return err;
2f1eb65f
JHS		 1897 }
1898
f7b6983f 1899 c.data.type = type;
f60f6b8f 1900 c.event = nlh->nlmsg_type;
26b15dad 1901 c.seq = nlh->nlmsg_seq;
15e47304 1902 c.portid = nlh->nlmsg_pid;
7067802e 1903 c.net = net;
26b15dad 1904 km_policy_notify(NULL, 0, &c);
1da177e4
LT		 1905 return 0;
1906}
1907
22e70050 1908static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1909 struct nlattr **attrs)
6c5c8ca7 1910{
fc34acd3 1911 struct net *net = sock_net(skb->sk);
6c5c8ca7 1912 struct xfrm_policy *xp;
7b67c857 1913 struct xfrm_user_polexpire *up = nlmsg_data(nlh);
6c5c8ca7 1914 struct xfrm_userpolicy_info *p = &up->pol;
b798a9ed 1915 u8 type = XFRM_POLICY_TYPE_MAIN;
6c5c8ca7 1916 int err = -ENOENT;
295fae56
JHS		 1917 struct xfrm_mark m;
1918 u32 mark = xfrm_mark_get(attrs, &m);
6c5c8ca7 1919
35a7aa08 1920 err = copy_from_user_policy_type(&type, attrs);
f7b6983f
MN		 1921 if (err)
1922 return err;
1923
c8bf4d04
TT		 1924 err = verify_policy_dir(p->dir);
1925 if (err)
1926 return err;
1927
6c5c8ca7 1928 if (p->index)
295fae56 1929 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err);
6c5c8ca7 1930 else {
5424f32e 1931 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
03e1ad7b 1932 struct xfrm_sec_ctx *ctx;
6c5c8ca7 1933
35a7aa08 1934 err = verify_sec_ctx_len(attrs);
6c5c8ca7
JHS		 1935 if (err)
1936 return err;
1937
2c8dd116 1938 ctx = NULL;
6c5c8ca7 1939 if (rt) {
5424f32e 1940 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
6c5c8ca7 1941
03e1ad7b
PM		 1942 err = security_xfrm_policy_alloc(&ctx, uctx);
1943 if (err)
6c5c8ca7 1944 return err;
2c8dd116 1945 }
295fae56 1946 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir,
6f26b61e 1947 &p->sel, ctx, 0, &err);
03e1ad7b 1948 security_xfrm_policy_free(ctx);
6c5c8ca7 1949 }
6c5c8ca7 1950 if (xp == NULL)
ef41aaa0 1951 return -ENOENT;
03e1ad7b 1952
ea2dea9d 1953 if (unlikely(xp->walk.dead))
6c5c8ca7 1954 goto out;
6c5c8ca7 1955
6c5c8ca7
JHS		 1956 err = 0;
1957 if (up->hard) {
e1760bd5 1958 kuid_t loginuid = audit_get_loginuid(current);
c53fa1ed
PM		 1959 u32 sessionid = audit_get_sessionid(current);
1960 u32 sid;
1961
1962 security_task_getsecid(current, &sid);
6c5c8ca7 1963 xfrm_policy_delete(xp, p->dir);
2532386f 1964 xfrm_audit_policy_delete(xp, 1, loginuid, sessionid, sid);
161a09e7 1965
6c5c8ca7
JHS		 1966 } else {
1967 // reset the timers here?
62db5cfd 1968 WARN(1, "Dont know what to do with soft policy expire\n");
6c5c8ca7 1969 }
c6bb8136 1970 km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid);
6c5c8ca7
JHS		 1971
1972out:
1973 xfrm_pol_put(xp);
1974 return err;
1975}
1976
22e70050 1977static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1978 struct nlattr **attrs)
53bc6b4d 1979{
fc34acd3 1980 struct net *net = sock_net(skb->sk);
53bc6b4d
JHS		 1981 struct xfrm_state *x;
1982 int err;
7b67c857 1983 struct xfrm_user_expire *ue = nlmsg_data(nlh);
53bc6b4d 1984 struct xfrm_usersa_info *p = &ue->state;
6f26b61e 1985 struct xfrm_mark m;
928497f0 1986 u32 mark = xfrm_mark_get(attrs, &m);
53bc6b4d 1987
6f26b61e 1988 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
53bc6b4d 1989
3a765aa5 1990 err = -ENOENT;
53bc6b4d
JHS		 1991 if (x == NULL)
1992 return err;
1993
53bc6b4d 1994 spin_lock_bh(&x->lock);
3a765aa5 1995 err = -EINVAL;
53bc6b4d
JHS		 1996 if (x->km.state != XFRM_STATE_VALID)
1997 goto out;
c6bb8136 1998 km_state_expired(x, ue->hard, nlh->nlmsg_pid);
53bc6b4d 1999
161a09e7 2000 if (ue->hard) {
e1760bd5 2001 kuid_t loginuid = audit_get_loginuid(current);
c53fa1ed
PM		 2002 u32 sessionid = audit_get_sessionid(current);
2003 u32 sid;
2004
2005 security_task_getsecid(current, &sid);
53bc6b4d 2006 __xfrm_state_delete(x);
2532386f 2007 xfrm_audit_state_delete(x, 1, loginuid, sessionid, sid);
161a09e7 2008 }
3a765aa5 2009 err = 0;
53bc6b4d
JHS		 2010out:
2011 spin_unlock_bh(&x->lock);
2012 xfrm_state_put(x);
2013 return err;
2014}
2015
22e70050 2016static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 2017 struct nlattr **attrs)
980ebd25 2018{
fc34acd3 2019 struct net *net = sock_net(skb->sk);
980ebd25
JHS		 2020 struct xfrm_policy *xp;
2021 struct xfrm_user_tmpl *ut;
2022 int i;
5424f32e 2023 struct nlattr *rt = attrs[XFRMA_TMPL];
6f26b61e 2024 struct xfrm_mark mark;
980ebd25 2025
7b67c857 2026 struct xfrm_user_acquire *ua = nlmsg_data(nlh);
fc34acd3 2027 struct xfrm_state *x = xfrm_state_alloc(net);
980ebd25
JHS		 2028 int err = -ENOMEM;
2029
2030 if (!x)
d8eb9307 2031 goto nomem;
980ebd25 2032
6f26b61e
JHS		 2033 xfrm_mark_get(attrs, &mark);
2034
980ebd25 2035 err = verify_newpolicy_info(&ua->policy);
d8eb9307
IJ		 2036 if (err)
2037 goto bad_policy;
980ebd25
JHS		 2038
2039 /* build an XP */
fc34acd3 2040 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err);
d8eb9307
IJ		 2041 if (!xp)
2042 goto free_state;
980ebd25
JHS		 2043
2044 memcpy(&x->id, &ua->id, sizeof(ua->id));
2045 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
2046 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
6f26b61e
JHS		 2047 xp->mark.m = x->mark.m = mark.m;
2048 xp->mark.v = x->mark.v = mark.v;
5424f32e 2049 ut = nla_data(rt);
980ebd25
JHS		 2050 /* extract the templates and for each call km_key */
2051 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
2052 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
2053 memcpy(&x->id, &t->id, sizeof(x->id));
2054 x->props.mode = t->mode;
2055 x->props.reqid = t->reqid;
2056 x->props.family = ut->family;
2057 t->aalgos = ua->aalgos;
2058 t->ealgos = ua->ealgos;
2059 t->calgos = ua->calgos;
2060 err = km_query(x, t, xp);
2061
2062 }
2063
2064 kfree(x);
2065 kfree(xp);
2066
2067 return 0;
d8eb9307
IJ		 2068
2069bad_policy:
62db5cfd 2070 WARN(1, "BAD policy passed\n");
d8eb9307
IJ		 2071free_state:
2072 kfree(x);
2073nomem:
2074 return err;
980ebd25
JHS		 2075}
2076
5c79de6e 2077#ifdef CONFIG_XFRM_MIGRATE
5c79de6e 2078static int copy_from_user_migrate(struct xfrm_migrate *ma,
13c1d189 2079 struct xfrm_kmaddress *k,
5424f32e 2080 struct nlattr **attrs, int *num)
5c79de6e 2081{
5424f32e 2082 struct nlattr *rt = attrs[XFRMA_MIGRATE];
5c79de6e
SS		 2083 struct xfrm_user_migrate *um;
2084 int i, num_migrate;
2085
13c1d189
AE		 2086 if (k != NULL) {
2087 struct xfrm_user_kmaddress *uk;
2088
2089 uk = nla_data(attrs[XFRMA_KMADDRESS]);
2090 memcpy(&k->local, &uk->local, sizeof(k->local));
2091 memcpy(&k->remote, &uk->remote, sizeof(k->remote));
2092 k->family = uk->family;
2093 k->reserved = uk->reserved;
2094 }
2095
5424f32e
TG		 2096 um = nla_data(rt);
2097 num_migrate = nla_len(rt) / sizeof(*um);
5c79de6e
SS		 2098
2099 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
2100 return -EINVAL;
2101
2102 for (i = 0; i < num_migrate; i++, um++, ma++) {
2103 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
2104 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
2105 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
2106 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
2107
2108 ma->proto = um->proto;
2109 ma->mode = um->mode;
2110 ma->reqid = um->reqid;
2111
2112 ma->old_family = um->old_family;
2113 ma->new_family = um->new_family;
2114 }
2115
2116 *num = i;
2117 return 0;
2118}
2119
2120static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 2121 struct nlattr **attrs)
5c79de6e 2122{
7b67c857 2123 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
5c79de6e 2124 struct xfrm_migrate m[XFRM_MAX_DEPTH];
13c1d189 2125 struct xfrm_kmaddress km, *kmp;
5c79de6e
SS		 2126 u8 type;
2127 int err;
2128 int n = 0;
2129
35a7aa08 2130 if (attrs[XFRMA_MIGRATE] == NULL)
cf5cb79f 2131 return -EINVAL;
5c79de6e 2132
13c1d189
AE		 2133 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
2134
5424f32e 2135 err = copy_from_user_policy_type(&type, attrs);
5c79de6e
SS		 2136 if (err)
2137 return err;
2138
13c1d189 2139 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
5c79de6e
SS		 2140 if (err)
2141 return err;
2142
2143 if (!n)
2144 return 0;
2145
13c1d189 2146 xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp);
5c79de6e
SS		 2147
2148 return 0;
2149}
2150#else
2151static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 2152 struct nlattr **attrs)
5c79de6e
SS		 2153{
2154 return -ENOPROTOOPT;
2155}
2156#endif
2157
2158#ifdef CONFIG_XFRM_MIGRATE
183cad12 2159static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
5c79de6e
SS		 2160{
2161 struct xfrm_user_migrate um;
2162
2163 memset(&um, 0, sizeof(um));
2164 um.proto = m->proto;
2165 um.mode = m->mode;
2166 um.reqid = m->reqid;
2167 um.old_family = m->old_family;
2168 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
2169 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
2170 um.new_family = m->new_family;
2171 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
2172 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
2173
c0144bea 2174 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
5c79de6e
SS		 2175}
2176
183cad12 2177static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
13c1d189
AE		 2178{
2179 struct xfrm_user_kmaddress uk;
2180
2181 memset(&uk, 0, sizeof(uk));
2182 uk.family = k->family;
2183 uk.reserved = k->reserved;
2184 memcpy(&uk.local, &k->local, sizeof(uk.local));
a1caa322 2185 memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
13c1d189
AE		 2186
2187 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
2188}
2189
2190static inline size_t xfrm_migrate_msgsize(int num_migrate, int with_kma)
7deb2264
TG		 2191{
2192 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
13c1d189
AE		 2193 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
2194 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
2195 + userpolicy_type_attrsize();
7deb2264
TG		 2196}
2197
183cad12
DM		 2198static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
2199 int num_migrate, const struct xfrm_kmaddress *k,
2200 const struct xfrm_selector *sel, u8 dir, u8 type)
5c79de6e 2201{
183cad12 2202 const struct xfrm_migrate *mp;
5c79de6e
SS		 2203 struct xfrm_userpolicy_id *pol_id;
2204 struct nlmsghdr *nlh;
1d1e34dd 2205 int i, err;
5c79de6e 2206
79b8b7f4
TG		 2207 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
2208 if (nlh == NULL)
2209 return -EMSGSIZE;
5c79de6e 2210
7b67c857 2211 pol_id = nlmsg_data(nlh);
5c79de6e
SS		 2212 /* copy data from selector, dir, and type to the pol_id */
2213 memset(pol_id, 0, sizeof(*pol_id));
2214 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
2215 pol_id->dir = dir;
2216
1d1e34dd
DM		 2217 if (k != NULL) {
2218 err = copy_to_user_kmaddress(k, skb);
2219 if (err)
2220 goto out_cancel;
2221 }
2222 err = copy_to_user_policy_type(type, skb);
2223 if (err)
2224 goto out_cancel;
5c79de6e 2225 for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
1d1e34dd
DM		 2226 err = copy_to_user_migrate(mp, skb);
2227 if (err)
2228 goto out_cancel;
5c79de6e
SS		 2229 }
2230
9825069d 2231 return nlmsg_end(skb, nlh);
1d1e34dd
DM		 2232
2233out_cancel:
9825069d 2234 nlmsg_cancel(skb, nlh);
1d1e34dd 2235 return err;
5c79de6e
SS		 2236}
2237
183cad12
DM		 2238static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2239 const struct xfrm_migrate *m, int num_migrate,
2240 const struct xfrm_kmaddress *k)
5c79de6e 2241{
a6483b79 2242 struct net *net = &init_net;
5c79de6e 2243 struct sk_buff *skb;
5c79de6e 2244
13c1d189 2245 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k), GFP_ATOMIC);
5c79de6e
SS		 2246 if (skb == NULL)
2247 return -ENOMEM;
2248
2249 /* build migrate */
13c1d189 2250 if (build_migrate(skb, m, num_migrate, k, sel, dir, type) < 0)
5c79de6e
SS		 2251 BUG();
2252
a6483b79 2253 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MIGRATE, GFP_ATOMIC);
5c79de6e
SS		 2254}
2255#else
183cad12
DM		 2256static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2257 const struct xfrm_migrate *m, int num_migrate,
2258 const struct xfrm_kmaddress *k)
5c79de6e
SS		 2259{
2260 return -ENOPROTOOPT;
2261}
2262#endif
d51d081d 2263
a7bd9a45 2264#define XMSGSIZE(type) sizeof(struct type)
492b558b
TG		 2265
2266static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
66f9a259 2267 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
492b558b
TG		 2268 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2269 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2270 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2271 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2272 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2273 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
980ebd25 2274 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
53bc6b4d 2275 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
492b558b 2276 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
66f9a259 2277 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
6c5c8ca7 2278 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
492b558b 2279 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
a7bd9a45 2280 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
d51d081d
JHS		 2281 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2282 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
97a64b45 2283 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
5c79de6e 2284 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
a7bd9a45
TG		 2285 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32),
2286 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
1da177e4
LT		 2287};
2288
492b558b
TG		 2289#undef XMSGSIZE
2290
cf5cb79f 2291static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
c28e9304 2292 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)},
2293 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)},
2294 [XFRMA_LASTUSED] = { .type = NLA_U64},
2295 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)},
1a6509d9 2296 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) },
cf5cb79f
TG		 2297 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) },
2298 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
2299 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) },
2300 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) },
2301 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) },
2302 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) },
2303 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
2304 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) },
2305 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 },
2306 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 },
2307 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) },
2308 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
2309 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
2310 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
13c1d189 2311 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) },
6f26b61e 2312 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) },
35d2856b 2313 [XFRMA_TFCPAD] = { .type = NLA_U32 },
d8647b79 2314 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) },
a947b0a9 2315 [XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 },
cf5cb79f
TG		 2316};
2317
1da177e4 2318static struct xfrm_link {
5424f32e 2319 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
1da177e4 2320 int (*dump)(struct sk_buff *, struct netlink_callback *);
4c563f76 2321 int (*done)(struct netlink_callback *);
492b558b
TG		 2322} xfrm_dispatch[XFRM_NR_MSGTYPES] = {
2323 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2324 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
2325 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
4c563f76
TT		 2326 .dump = xfrm_dump_sa,
2327 .done = xfrm_dump_sa_done },
492b558b
TG		 2328 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2329 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
2330 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
4c563f76
TT		 2331 .dump = xfrm_dump_policy,
2332 .done = xfrm_dump_policy_done },
492b558b 2333 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
980ebd25 2334 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
53bc6b4d 2335 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
492b558b
TG		 2336 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2337 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
6c5c8ca7 2338 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
492b558b
TG		 2339 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
2340 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
d51d081d
JHS		 2341 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
2342 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
5c79de6e 2343 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
566ec034 2344 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo },
ecfd6b18 2345 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo },
1da177e4
LT		 2346};
2347
1d00a4eb 2348static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 2349{
a6483b79 2350 struct net *net = sock_net(skb->sk);
35a7aa08 2351 struct nlattr *attrs[XFRMA_MAX+1];
1da177e4 2352 struct xfrm_link *link;
a7bd9a45 2353 int type, err;
1da177e4 2354
1da177e4 2355 type = nlh->nlmsg_type;
1da177e4 2356 if (type > XFRM_MSG_MAX)
1d00a4eb 2357 return -EINVAL;
1da177e4
LT		 2358
2359 type -= XFRM_MSG_BASE;
2360 link = &xfrm_dispatch[type];
2361
2362 /* All operations require privileges, even GET */
df008c91 2363 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1d00a4eb 2364 return -EPERM;
1da177e4 2365
492b558b
TG		 2366 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
2367 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
b8f3ab42 2368 (nlh->nlmsg_flags & NLM_F_DUMP)) {
1da177e4 2369 if (link->dump == NULL)
1d00a4eb 2370 return -EINVAL;
88fc2c84 2371
80d326fa
PNA		 2372 {
2373 struct netlink_dump_control c = {
2374 .dump = link->dump,
2375 .done = link->done,
2376 };
2377 return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
2378 }
1da177e4
LT		 2379 }
2380
35a7aa08 2381 err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs, XFRMA_MAX,
cf5cb79f 2382 xfrma_policy);
a7bd9a45
TG		 2383 if (err < 0)
2384 return err;
1da177e4
LT		 2385
2386 if (link->doit == NULL)
1d00a4eb 2387 return -EINVAL;
1da177e4 2388
5424f32e 2389 return link->doit(skb, nlh, attrs);
1da177e4
LT		 2390}
2391
cd40b7d3 2392static void xfrm_netlink_rcv(struct sk_buff *skb)
1da177e4 2393{
cd40b7d3
DL		 2394 mutex_lock(&xfrm_cfg_mutex);
2395 netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
2396 mutex_unlock(&xfrm_cfg_mutex);
1da177e4
LT		 2397}
2398
7deb2264
TG		 2399static inline size_t xfrm_expire_msgsize(void)
2400{
6f26b61e
JHS		 2401 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire))
2402 + nla_total_size(sizeof(struct xfrm_mark));
7deb2264
TG		 2403}
2404
214e005b 2405static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
1da177e4
LT		 2406{
2407 struct xfrm_user_expire *ue;
2408 struct nlmsghdr *nlh;
1d1e34dd 2409 int err;
1da177e4 2410
15e47304 2411 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
79b8b7f4
TG		 2412 if (nlh == NULL)
2413 return -EMSGSIZE;
1da177e4 2414
7b67c857 2415 ue = nlmsg_data(nlh);
1da177e4 2416 copy_to_user_state(x, &ue->state);
d51d081d 2417 ue->hard = (c->data.hard != 0) ? 1 : 0;
1da177e4 2418
1d1e34dd
DM		 2419 err = xfrm_mark_put(skb, &x->mark);
2420 if (err)
2421 return err;
6f26b61e 2422
9825069d 2423 return nlmsg_end(skb, nlh);
1da177e4
LT		 2424}
2425
214e005b 2426static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
1da177e4 2427{
fc34acd3 2428 struct net *net = xs_net(x);
1da177e4
LT		 2429 struct sk_buff *skb;
2430
7deb2264 2431 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
1da177e4
LT		 2432 if (skb == NULL)
2433 return -ENOMEM;
2434
6f26b61e
JHS		 2435 if (build_expire(skb, x, c) < 0) {
2436 kfree_skb(skb);
2437 return -EMSGSIZE;
2438 }
1da177e4 2439
a6483b79 2440 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
1da177e4
LT		 2441}
2442
214e005b 2443static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
d51d081d 2444{
fc34acd3 2445 struct net *net = xs_net(x);
d51d081d 2446 struct sk_buff *skb;
d51d081d 2447
d8647b79 2448 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
d51d081d
JHS		 2449 if (skb == NULL)
2450 return -ENOMEM;
2451
2452 if (build_aevent(skb, x, c) < 0)
2453 BUG();
2454
a6483b79 2455 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_AEVENTS, GFP_ATOMIC);
d51d081d
JHS		 2456}
2457
214e005b 2458static int xfrm_notify_sa_flush(const struct km_event *c)
26b15dad 2459{
7067802e 2460 struct net *net = c->net;
26b15dad
JHS		 2461 struct xfrm_usersa_flush *p;
2462 struct nlmsghdr *nlh;
2463 struct sk_buff *skb;
7deb2264 2464 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
26b15dad 2465
7deb2264 2466 skb = nlmsg_new(len, GFP_ATOMIC);
26b15dad
JHS		 2467 if (skb == NULL)
2468 return -ENOMEM;
26b15dad 2469
15e47304 2470 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
79b8b7f4
TG		 2471 if (nlh == NULL) {
2472 kfree_skb(skb);
2473 return -EMSGSIZE;
2474 }
26b15dad 2475
7b67c857 2476 p = nlmsg_data(nlh);
bf08867f 2477 p->proto = c->data.proto;
26b15dad 2478
9825069d 2479 nlmsg_end(skb, nlh);
26b15dad 2480
a6483b79 2481 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
26b15dad
JHS		 2482}
2483
7deb2264 2484static inline size_t xfrm_sa_len(struct xfrm_state *x)
26b15dad 2485{
7deb2264 2486 size_t l = 0;
1a6509d9
HX		 2487 if (x->aead)
2488 l += nla_total_size(aead_len(x->aead));
4447bb33
MW		 2489 if (x->aalg) {
2490 l += nla_total_size(sizeof(struct xfrm_algo) +
2491 (x->aalg->alg_key_len + 7) / 8);
2492 l += nla_total_size(xfrm_alg_auth_len(x->aalg));
2493 }
26b15dad 2494 if (x->ealg)
0f99be0d 2495 l += nla_total_size(xfrm_alg_len(x->ealg));
26b15dad 2496 if (x->calg)
7deb2264 2497 l += nla_total_size(sizeof(*x->calg));
26b15dad 2498 if (x->encap)
7deb2264 2499 l += nla_total_size(sizeof(*x->encap));
35d2856b
MW		 2500 if (x->tfcpad)
2501 l += nla_total_size(sizeof(x->tfcpad));
d8647b79
SK		 2502 if (x->replay_esn)
2503 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
68325d3b
HX		 2504 if (x->security)
2505 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2506 x->security->ctx_len);
2507 if (x->coaddr)
2508 l += nla_total_size(sizeof(*x->coaddr));
a947b0a9
ND		 2509 if (x->props.extra_flags)
2510 l += nla_total_size(sizeof(x->props.extra_flags));
68325d3b 2511
d26f3984
HX		 2512 /* Must count x->lastused as it may become non-zero behind our back. */
2513 l += nla_total_size(sizeof(u64));
26b15dad
JHS		 2514
2515 return l;
2516}
2517
214e005b 2518static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
26b15dad 2519{
fc34acd3 2520 struct net *net = xs_net(x);
26b15dad 2521 struct xfrm_usersa_info *p;
0603eac0 2522 struct xfrm_usersa_id *id;
26b15dad
JHS		 2523 struct nlmsghdr *nlh;
2524 struct sk_buff *skb;
26b15dad 2525 int len = xfrm_sa_len(x);
1d1e34dd 2526 int headlen, err;
0603eac0
HX		 2527
2528 headlen = sizeof(*p);
2529 if (c->event == XFRM_MSG_DELSA) {
7deb2264 2530 len += nla_total_size(headlen);
0603eac0 2531 headlen = sizeof(*id);
6f26b61e 2532 len += nla_total_size(sizeof(struct xfrm_mark));
0603eac0 2533 }
7deb2264 2534 len += NLMSG_ALIGN(headlen);
26b15dad 2535
7deb2264 2536 skb = nlmsg_new(len, GFP_ATOMIC);
26b15dad
JHS		 2537 if (skb == NULL)
2538 return -ENOMEM;
26b15dad 2539
15e47304 2540 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
1d1e34dd 2541 err = -EMSGSIZE;
79b8b7f4 2542 if (nlh == NULL)
1d1e34dd 2543 goto out_free_skb;
26b15dad 2544
7b67c857 2545 p = nlmsg_data(nlh);
0603eac0 2546 if (c->event == XFRM_MSG_DELSA) {
c0144bea
TG		 2547 struct nlattr *attr;
2548
7b67c857 2549 id = nlmsg_data(nlh);
0603eac0
HX		 2550 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2551 id->spi = x->id.spi;
2552 id->family = x->props.family;
2553 id->proto = x->id.proto;
2554
c0144bea 2555 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
1d1e34dd 2556 err = -EMSGSIZE;
c0144bea 2557 if (attr == NULL)
1d1e34dd 2558 goto out_free_skb;
c0144bea
TG		 2559
2560 p = nla_data(attr);
0603eac0 2561 }
1d1e34dd
DM		 2562 err = copy_to_user_state_extra(x, p, skb);
2563 if (err)
2564 goto out_free_skb;
26b15dad 2565
9825069d 2566 nlmsg_end(skb, nlh);
26b15dad 2567
a6483b79 2568 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
26b15dad 2569
1d1e34dd 2570out_free_skb:
26b15dad 2571 kfree_skb(skb);
1d1e34dd 2572 return err;
26b15dad
JHS		 2573}
2574
214e005b 2575static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
26b15dad
JHS		 2576{
2577
2578 switch (c->event) {
f60f6b8f 2579 case XFRM_MSG_EXPIRE:
26b15dad 2580 return xfrm_exp_state_notify(x, c);
d51d081d
JHS		 2581 case XFRM_MSG_NEWAE:
2582 return xfrm_aevent_state_notify(x, c);
f60f6b8f
HX		 2583 case XFRM_MSG_DELSA:
2584 case XFRM_MSG_UPDSA:
2585 case XFRM_MSG_NEWSA:
26b15dad 2586 return xfrm_notify_sa(x, c);
f60f6b8f 2587 case XFRM_MSG_FLUSHSA:
26b15dad
JHS		 2588 return xfrm_notify_sa_flush(c);
2589 default:
62db5cfd 2590 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
2591 c->event);
2592 break;
26b15dad
JHS		 2593 }
2594
2595 return 0;
2596
2597}
2598
7deb2264
TG		 2599static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x,
2600 struct xfrm_policy *xp)
2601{
2602 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
2603 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
6f26b61e 2604 + nla_total_size(sizeof(struct xfrm_mark))
7deb2264
TG		 2605 + nla_total_size(xfrm_user_sec_ctx_size(x->security))
2606 + userpolicy_type_attrsize();
2607}
2608
1da177e4 2609static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
65e0736b 2610 struct xfrm_tmpl *xt, struct xfrm_policy *xp)
1da177e4 2611{
1d1e34dd 2612 __u32 seq = xfrm_get_acqseq();
1da177e4
LT		 2613 struct xfrm_user_acquire *ua;
2614 struct nlmsghdr *nlh;
1d1e34dd 2615 int err;
1da177e4 2616
79b8b7f4
TG		 2617 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
2618 if (nlh == NULL)
2619 return -EMSGSIZE;
1da177e4 2620
7b67c857 2621 ua = nlmsg_data(nlh);
1da177e4
LT		 2622 memcpy(&ua->id, &x->id, sizeof(ua->id));
2623 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2624 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
65e0736b 2625 copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT);
1da177e4
LT		 2626 ua->aalgos = xt->aalgos;
2627 ua->ealgos = xt->ealgos;
2628 ua->calgos = xt->calgos;
2629 ua->seq = x->km.seq = seq;
2630
1d1e34dd
DM		 2631 err = copy_to_user_tmpl(xp, skb);
2632 if (!err)
2633 err = copy_to_user_state_sec_ctx(x, skb);
2634 if (!err)
2635 err = copy_to_user_policy_type(xp->type, skb);
2636 if (!err)
2637 err = xfrm_mark_put(skb, &xp->mark);
2638 if (err) {
2639 nlmsg_cancel(skb, nlh);
2640 return err;
2641 }
1da177e4 2642
9825069d 2643 return nlmsg_end(skb, nlh);
1da177e4
LT		 2644}
2645
2646static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
65e0736b 2647 struct xfrm_policy *xp)
1da177e4 2648{
a6483b79 2649 struct net *net = xs_net(x);
1da177e4 2650 struct sk_buff *skb;
1da177e4 2651
7deb2264 2652 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
1da177e4
LT		 2653 if (skb == NULL)
2654 return -ENOMEM;
2655
65e0736b 2656 if (build_acquire(skb, x, xt, xp) < 0)
1da177e4
LT		 2657 BUG();
2658
a6483b79 2659 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_ACQUIRE, GFP_ATOMIC);
1da177e4
LT		 2660}
2661
2662/* User gives us xfrm_user_policy_info followed by an array of 0
2663 * or more templates.
2664 */
cb969f07 2665static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
1da177e4
LT		 2666 u8 *data, int len, int *dir)
2667{
fc34acd3 2668 struct net *net = sock_net(sk);
1da177e4
LT		 2669 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2670 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2671 struct xfrm_policy *xp;
2672 int nr;
2673
cb969f07 2674 switch (sk->sk_family) {
1da177e4
LT		 2675 case AF_INET:
2676 if (opt != IP_XFRM_POLICY) {
2677 *dir = -EOPNOTSUPP;
2678 return NULL;
2679 }
2680 break;
dfd56b8b 2681#if IS_ENABLED(CONFIG_IPV6)
1da177e4
LT		 2682 case AF_INET6:
2683 if (opt != IPV6_XFRM_POLICY) {
2684 *dir = -EOPNOTSUPP;
2685 return NULL;
2686 }
2687 break;
2688#endif
2689 default:
2690 *dir = -EINVAL;
2691 return NULL;
2692 }
2693
2694 *dir = -EINVAL;
2695
2696 if (len < sizeof(*p) ||
2697 verify_newpolicy_info(p))
2698 return NULL;
2699
2700 nr = ((len - sizeof(*p)) / sizeof(*ut));
b4ad86bf 2701 if (validate_tmpl(nr, ut, p->sel.family))
1da177e4
LT		 2702 return NULL;
2703
a4f1bac6
HX		 2704 if (p->dir > XFRM_POLICY_OUT)
2705 return NULL;
2706
2f09a4d5 2707 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
1da177e4
LT		 2708 if (xp == NULL) {
2709 *dir = -ENOBUFS;
2710 return NULL;
2711 }
2712
2713 copy_from_user_policy(xp, p);
f7b6983f 2714 xp->type = XFRM_POLICY_TYPE_MAIN;
1da177e4
LT		 2715 copy_templates(xp, ut, nr);
2716
2717 *dir = p->dir;
2718
2719 return xp;
2720}
2721
7deb2264
TG		 2722static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp)
2723{
2724 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
2725 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2726 + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
295fae56 2727 + nla_total_size(sizeof(struct xfrm_mark))
7deb2264
TG		 2728 + userpolicy_type_attrsize();
2729}
2730
1da177e4 2731static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
214e005b 2732 int dir, const struct km_event *c)
1da177e4
LT		 2733{
2734 struct xfrm_user_polexpire *upe;
d51d081d 2735 int hard = c->data.hard;
1d1e34dd
DM		 2736 struct nlmsghdr *nlh;
2737 int err;
1da177e4 2738
15e47304 2739 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
79b8b7f4
TG		 2740 if (nlh == NULL)
2741 return -EMSGSIZE;
1da177e4 2742
7b67c857 2743 upe = nlmsg_data(nlh);
1da177e4 2744 copy_to_user_policy(xp, &upe->pol, dir);
1d1e34dd
DM		 2745 err = copy_to_user_tmpl(xp, skb);
2746 if (!err)
2747 err = copy_to_user_sec_ctx(xp, skb);
2748 if (!err)
2749 err = copy_to_user_policy_type(xp->type, skb);
2750 if (!err)
2751 err = xfrm_mark_put(skb, &xp->mark);
2752 if (err) {
2753 nlmsg_cancel(skb, nlh);
2754 return err;
2755 }
1da177e4
LT		 2756 upe->hard = !!hard;
2757
9825069d 2758 return nlmsg_end(skb, nlh);
1da177e4
LT		 2759}
2760
214e005b 2761static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
1da177e4 2762{
fc34acd3 2763 struct net *net = xp_net(xp);
1da177e4 2764 struct sk_buff *skb;
1da177e4 2765
7deb2264 2766 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
1da177e4
LT		 2767 if (skb == NULL)
2768 return -ENOMEM;
2769
d51d081d 2770 if (build_polexpire(skb, xp, dir, c) < 0)
1da177e4
LT		 2771 BUG();
2772
a6483b79 2773 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
1da177e4
LT		 2774}
2775
214e005b 2776static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
26b15dad 2777{
1d1e34dd 2778 int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
fc34acd3 2779 struct net *net = xp_net(xp);
26b15dad 2780 struct xfrm_userpolicy_info *p;
0603eac0 2781 struct xfrm_userpolicy_id *id;
26b15dad
JHS		 2782 struct nlmsghdr *nlh;
2783 struct sk_buff *skb;
1d1e34dd 2784 int headlen, err;
0603eac0
HX		 2785
2786 headlen = sizeof(*p);
2787 if (c->event == XFRM_MSG_DELPOLICY) {
7deb2264 2788 len += nla_total_size(headlen);
0603eac0
HX		 2789 headlen = sizeof(*id);
2790 }
cfbfd45a 2791 len += userpolicy_type_attrsize();
295fae56 2792 len += nla_total_size(sizeof(struct xfrm_mark));
7deb2264 2793 len += NLMSG_ALIGN(headlen);
26b15dad 2794
7deb2264 2795 skb = nlmsg_new(len, GFP_ATOMIC);
26b15dad
JHS		 2796 if (skb == NULL)
2797 return -ENOMEM;
26b15dad 2798
15e47304 2799 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
1d1e34dd 2800 err = -EMSGSIZE;
79b8b7f4 2801 if (nlh == NULL)
1d1e34dd 2802 goto out_free_skb;
26b15dad 2803
7b67c857 2804 p = nlmsg_data(nlh);
0603eac0 2805 if (c->event == XFRM_MSG_DELPOLICY) {
c0144bea
TG		 2806 struct nlattr *attr;
2807
7b67c857 2808 id = nlmsg_data(nlh);
0603eac0
HX		 2809 memset(id, 0, sizeof(*id));
2810 id->dir = dir;
2811 if (c->data.byid)
2812 id->index = xp->index;
2813 else
2814 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
2815
c0144bea 2816 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
1d1e34dd 2817 err = -EMSGSIZE;
c0144bea 2818 if (attr == NULL)
1d1e34dd 2819 goto out_free_skb;
c0144bea
TG		 2820
2821 p = nla_data(attr);
0603eac0 2822 }
26b15dad 2823
26b15dad 2824 copy_to_user_policy(xp, p, dir);
1d1e34dd
DM		 2825 err = copy_to_user_tmpl(xp, skb);
2826 if (!err)
2827 err = copy_to_user_policy_type(xp->type, skb);
2828 if (!err)
2829 err = xfrm_mark_put(skb, &xp->mark);
2830 if (err)
2831 goto out_free_skb;
295fae56 2832
9825069d 2833 nlmsg_end(skb, nlh);
26b15dad 2834
a6483b79 2835 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
26b15dad 2836
1d1e34dd 2837out_free_skb:
26b15dad 2838 kfree_skb(skb);
1d1e34dd 2839 return err;
26b15dad
JHS		 2840}
2841
214e005b 2842static int xfrm_notify_policy_flush(const struct km_event *c)
26b15dad 2843{
7067802e 2844 struct net *net = c->net;
26b15dad
JHS		 2845 struct nlmsghdr *nlh;
2846 struct sk_buff *skb;
1d1e34dd 2847 int err;
26b15dad 2848
7deb2264 2849 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
26b15dad
JHS		 2850 if (skb == NULL)
2851 return -ENOMEM;
26b15dad 2852
15e47304 2853 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
1d1e34dd 2854 err = -EMSGSIZE;
79b8b7f4 2855 if (nlh == NULL)
1d1e34dd
DM		 2856 goto out_free_skb;
2857 err = copy_to_user_policy_type(c->data.type, skb);
2858 if (err)
2859 goto out_free_skb;
26b15dad 2860
9825069d 2861 nlmsg_end(skb, nlh);
26b15dad 2862
a6483b79 2863 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
26b15dad 2864
1d1e34dd 2865out_free_skb:
26b15dad 2866 kfree_skb(skb);
1d1e34dd 2867 return err;
26b15dad
JHS		 2868}
2869
214e005b 2870static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
26b15dad
JHS		 2871{
2872
2873 switch (c->event) {
f60f6b8f
HX		 2874 case XFRM_MSG_NEWPOLICY:
2875 case XFRM_MSG_UPDPOLICY:
2876 case XFRM_MSG_DELPOLICY:
26b15dad 2877 return xfrm_notify_policy(xp, dir, c);
f60f6b8f 2878 case XFRM_MSG_FLUSHPOLICY:
26b15dad 2879 return xfrm_notify_policy_flush(c);
f60f6b8f 2880 case XFRM_MSG_POLEXPIRE:
26b15dad
JHS		 2881 return xfrm_exp_policy_notify(xp, dir, c);
2882 default:
62db5cfd 2883 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
2884 c->event);
26b15dad
JHS		 2885 }
2886
2887 return 0;
2888
2889}
2890
7deb2264
TG		 2891static inline size_t xfrm_report_msgsize(void)
2892{
2893 return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
2894}
2895
97a64b45
MN		 2896static int build_report(struct sk_buff *skb, u8 proto,
2897 struct xfrm_selector *sel, xfrm_address_t *addr)
2898{
2899 struct xfrm_user_report *ur;
2900 struct nlmsghdr *nlh;
97a64b45 2901
79b8b7f4
TG		 2902 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
2903 if (nlh == NULL)
2904 return -EMSGSIZE;
97a64b45 2905
7b67c857 2906 ur = nlmsg_data(nlh);
97a64b45
MN		 2907 ur->proto = proto;
2908 memcpy(&ur->sel, sel, sizeof(ur->sel));
2909
1d1e34dd
DM		 2910 if (addr) {
2911 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr);
2912 if (err) {
2913 nlmsg_cancel(skb, nlh);
2914 return err;
2915 }
2916 }
9825069d 2917 return nlmsg_end(skb, nlh);
97a64b45
MN		 2918}
2919
db983c11
AD		 2920static int xfrm_send_report(struct net *net, u8 proto,
2921 struct xfrm_selector *sel, xfrm_address_t *addr)
97a64b45
MN		 2922{
2923 struct sk_buff *skb;
97a64b45 2924
7deb2264 2925 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
97a64b45
MN		 2926 if (skb == NULL)
2927 return -ENOMEM;
2928
2929 if (build_report(skb, proto, sel, addr) < 0)
2930 BUG();
2931
a6483b79 2932 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_REPORT, GFP_ATOMIC);
97a64b45
MN		 2933}
2934
3a2dfbe8
MW		 2935static inline size_t xfrm_mapping_msgsize(void)
2936{
2937 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
2938}
2939
2940static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
2941 xfrm_address_t *new_saddr, __be16 new_sport)
2942{
2943 struct xfrm_user_mapping *um;
2944 struct nlmsghdr *nlh;
2945
2946 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
2947 if (nlh == NULL)
2948 return -EMSGSIZE;
2949
2950 um = nlmsg_data(nlh);
2951
2952 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
2953 um->id.spi = x->id.spi;
2954 um->id.family = x->props.family;
2955 um->id.proto = x->id.proto;
2956 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
2957 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
2958 um->new_sport = new_sport;
2959 um->old_sport = x->encap->encap_sport;
2960 um->reqid = x->props.reqid;
2961
2962 return nlmsg_end(skb, nlh);
2963}
2964
2965static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
2966 __be16 sport)
2967{
a6483b79 2968 struct net *net = xs_net(x);
3a2dfbe8
MW		 2969 struct sk_buff *skb;
2970
2971 if (x->id.proto != IPPROTO_ESP)
2972 return -EINVAL;
2973
2974 if (!x->encap)
2975 return -EINVAL;
2976
2977 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
2978 if (skb == NULL)
2979 return -ENOMEM;
2980
2981 if (build_mapping(skb, x, ipaddr, sport) < 0)
2982 BUG();
2983
a6483b79 2984 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MAPPING, GFP_ATOMIC);
3a2dfbe8
MW		 2985}
2986
1da177e4
LT		 2987static struct xfrm_mgr netlink_mgr = {
2988 .id = "netlink",
2989 .notify = xfrm_send_state_notify,
2990 .acquire = xfrm_send_acquire,
2991 .compile_policy = xfrm_compile_policy,
2992 .notify_policy = xfrm_send_policy_notify,
97a64b45 2993 .report = xfrm_send_report,
5c79de6e 2994 .migrate = xfrm_send_migrate,
3a2dfbe8 2995 .new_mapping = xfrm_send_mapping,
1da177e4
LT		 2996};
2997
a6483b79 2998static int __net_init xfrm_user_net_init(struct net *net)
1da177e4 2999{
be33690d 3000 struct sock *nlsk;
a31f2d17
PNA		 3001 struct netlink_kernel_cfg cfg = {
3002 .groups = XFRMNLGRP_MAX,
3003 .input = xfrm_netlink_rcv,
3004 };
be33690d 3005
9f00d977 3006 nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg);
be33690d 3007 if (nlsk == NULL)
1da177e4 3008 return -ENOMEM;
d79d792e 3009 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
cf778b00 3010 rcu_assign_pointer(net->xfrm.nlsk, nlsk);
1da177e4
LT		 3011 return 0;
3012}
3013
d79d792e 3014static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
1da177e4 3015{
d79d792e
EB		 3016 struct net *net;
3017 list_for_each_entry(net, net_exit_list, exit_list)
a9b3cd7f 3018 RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
d79d792e
EB		 3019 synchronize_net();
3020 list_for_each_entry(net, net_exit_list, exit_list)
3021 netlink_kernel_release(net->xfrm.nlsk_stash);
1da177e4
LT		 3022}
3023
a6483b79 3024static struct pernet_operations xfrm_user_net_ops = {
d79d792e
EB		 3025 .init = xfrm_user_net_init,
3026 .exit_batch = xfrm_user_net_exit,
a6483b79
AD		 3027};
3028
3029static int __init xfrm_user_init(void)
3030{
3031 int rv;
3032
3033 printk(KERN_INFO "Initializing XFRM netlink socket\n");
3034
3035 rv = register_pernet_subsys(&xfrm_user_net_ops);
3036 if (rv < 0)
3037 return rv;
3038 rv = xfrm_register_km(&netlink_mgr);
3039 if (rv < 0)
3040 unregister_pernet_subsys(&xfrm_user_net_ops);
3041 return rv;
3042}
3043
3044static void __exit xfrm_user_exit(void)
3045{
3046 xfrm_unregister_km(&netlink_mgr);
3047 unregister_pernet_subsys(&xfrm_user_net_ops);
3048}
3049
1da177e4
LT		 3050module_init(xfrm_user_init);
3051module_exit(xfrm_user_exit);
3052MODULE_LICENSE("GPL");
4fdb3bb7 3053MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
f8cd5488 3054
Linux 6.x block layer and io_uring tree(s)