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