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ipv6: Fix RTM_GETROUTE's interpretation of RTA_IIF to be consistent with ipv4
[linux-2.6-block.git] / net / xfrm / xfrm_user.c
CommitLineData
1da177e4
LT		 1/* xfrm_user.c: User interface to configure xfrm engine.
2 *
3 * Copyright (C) 2002 David S. Miller (davem@redhat.com)
4 *
5 * Changes:
6 * Mitsuru KANDA @USAGI
7 * Kazunori MIYAZAWA @USAGI
8 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
9 * IPv6 support
df71837d 10 *
1da177e4
LT		 11 */
12
9409f38a 13#include <linux/crypto.h>
1da177e4
LT		 14#include <linux/module.h>
15#include <linux/kernel.h>
16#include <linux/types.h>
17#include <linux/slab.h>
18#include <linux/socket.h>
19#include <linux/string.h>
20#include <linux/net.h>
21#include <linux/skbuff.h>
1da177e4
LT		 22#include <linux/pfkeyv2.h>
23#include <linux/ipsec.h>
24#include <linux/init.h>
25#include <linux/security.h>
26#include <net/sock.h>
27#include <net/xfrm.h>
88fc2c84 28#include <net/netlink.h>
fa6dd8a2 29#include <net/ah.h>
1da177e4 30#include <asm/uaccess.h>
dfd56b8b 31#if IS_ENABLED(CONFIG_IPV6)
e23c7194
MN		 32#include <linux/in6.h>
33#endif
1da177e4 34
1a6509d9
HX		 35static inline int aead_len(struct xfrm_algo_aead *alg)
36{
37 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
38}
39
5424f32e 40static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type)
1da177e4 41{
5424f32e 42 struct nlattr *rt = attrs[type];
1da177e4
LT		 43 struct xfrm_algo *algp;
44
45 if (!rt)
46 return 0;
47
5424f32e 48 algp = nla_data(rt);
0f99be0d 49 if (nla_len(rt) < xfrm_alg_len(algp))
31c26852
HX		 50 return -EINVAL;
51
1da177e4
LT		 52 switch (type) {
53 case XFRMA_ALG_AUTH:
1da177e4 54 case XFRMA_ALG_CRYPT:
1da177e4 55 case XFRMA_ALG_COMP:
1da177e4
LT		 56 break;
57
58 default:
59 return -EINVAL;
3ff50b79 60 }
1da177e4
LT		 61
62 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
63 return 0;
64}
65
4447bb33
MW		 66static int verify_auth_trunc(struct nlattr **attrs)
67{
68 struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC];
69 struct xfrm_algo_auth *algp;
70
71 if (!rt)
72 return 0;
73
74 algp = nla_data(rt);
75 if (nla_len(rt) < xfrm_alg_auth_len(algp))
76 return -EINVAL;
77
78 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
79 return 0;
80}
81
1a6509d9
HX		 82static int verify_aead(struct nlattr **attrs)
83{
84 struct nlattr *rt = attrs[XFRMA_ALG_AEAD];
85 struct xfrm_algo_aead *algp;
86
87 if (!rt)
88 return 0;
89
90 algp = nla_data(rt);
91 if (nla_len(rt) < aead_len(algp))
92 return -EINVAL;
93
94 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
95 return 0;
96}
97
5424f32e 98static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type,
eb2971b6
MN		 99 xfrm_address_t **addrp)
100{
5424f32e 101 struct nlattr *rt = attrs[type];
eb2971b6 102
cf5cb79f 103 if (rt && addrp)
5424f32e 104 *addrp = nla_data(rt);
eb2971b6 105}
df71837d 106
5424f32e 107static inline int verify_sec_ctx_len(struct nlattr **attrs)
df71837d 108{
5424f32e 109 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
df71837d 110 struct xfrm_user_sec_ctx *uctx;
df71837d
TJ		 111
112 if (!rt)
113 return 0;
114
5424f32e 115 uctx = nla_data(rt);
cf5cb79f 116 if (uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len))
df71837d
TJ		 117 return -EINVAL;
118
119 return 0;
120}
121
d8647b79
SK		 122static inline int verify_replay(struct xfrm_usersa_info *p,
123 struct nlattr **attrs)
124{
125 struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL];
126
7833aa05
SK		 127 if ((p->flags & XFRM_STATE_ESN) && !rt)
128 return -EINVAL;
129
d8647b79
SK		 130 if (!rt)
131 return 0;
132
02aadf72
SK		 133 if (p->id.proto != IPPROTO_ESP)
134 return -EINVAL;
135
d8647b79
SK		 136 if (p->replay_window != 0)
137 return -EINVAL;
138
139 return 0;
140}
df71837d 141
1da177e4 142static int verify_newsa_info(struct xfrm_usersa_info *p,
5424f32e 143 struct nlattr **attrs)
1da177e4
LT		 144{
145 int err;
146
147 err = -EINVAL;
148 switch (p->family) {
149 case AF_INET:
150 break;
151
152 case AF_INET6:
dfd56b8b 153#if IS_ENABLED(CONFIG_IPV6)
1da177e4
LT		 154 break;
155#else
156 err = -EAFNOSUPPORT;
157 goto out;
158#endif
159
160 default:
161 goto out;
3ff50b79 162 }
1da177e4
LT		 163
164 err = -EINVAL;
165 switch (p->id.proto) {
166 case IPPROTO_AH:
4447bb33
MW		 167 if ((!attrs[XFRMA_ALG_AUTH] &&
168 !attrs[XFRMA_ALG_AUTH_TRUNC]) ||
1a6509d9 169 attrs[XFRMA_ALG_AEAD] ||
35a7aa08 170 attrs[XFRMA_ALG_CRYPT] ||
35d2856b
MW		 171 attrs[XFRMA_ALG_COMP] ||
172 attrs[XFRMA_TFCPAD])
1da177e4
LT		 173 goto out;
174 break;
175
176 case IPPROTO_ESP:
1a6509d9
HX		 177 if (attrs[XFRMA_ALG_COMP])
178 goto out;
179 if (!attrs[XFRMA_ALG_AUTH] &&
4447bb33 180 !attrs[XFRMA_ALG_AUTH_TRUNC] &&
1a6509d9
HX		 181 !attrs[XFRMA_ALG_CRYPT] &&
182 !attrs[XFRMA_ALG_AEAD])
183 goto out;
184 if ((attrs[XFRMA_ALG_AUTH] ||
4447bb33 185 attrs[XFRMA_ALG_AUTH_TRUNC] ||
1a6509d9
HX		 186 attrs[XFRMA_ALG_CRYPT]) &&
187 attrs[XFRMA_ALG_AEAD])
1da177e4 188 goto out;
35d2856b
MW		 189 if (attrs[XFRMA_TFCPAD] &&
190 p->mode != XFRM_MODE_TUNNEL)
191 goto out;
1da177e4
LT		 192 break;
193
194 case IPPROTO_COMP:
35a7aa08 195 if (!attrs[XFRMA_ALG_COMP] ||
1a6509d9 196 attrs[XFRMA_ALG_AEAD] ||
35a7aa08 197 attrs[XFRMA_ALG_AUTH] ||
4447bb33 198 attrs[XFRMA_ALG_AUTH_TRUNC] ||
35d2856b
MW		 199 attrs[XFRMA_ALG_CRYPT] ||
200 attrs[XFRMA_TFCPAD])
1da177e4
LT		 201 goto out;
202 break;
203
dfd56b8b 204#if IS_ENABLED(CONFIG_IPV6)
e23c7194
MN		 205 case IPPROTO_DSTOPTS:
206 case IPPROTO_ROUTING:
35a7aa08
TG		 207 if (attrs[XFRMA_ALG_COMP] ||
208 attrs[XFRMA_ALG_AUTH] ||
4447bb33 209 attrs[XFRMA_ALG_AUTH_TRUNC] ||
1a6509d9 210 attrs[XFRMA_ALG_AEAD] ||
35a7aa08
TG		 211 attrs[XFRMA_ALG_CRYPT] ||
212 attrs[XFRMA_ENCAP] ||
213 attrs[XFRMA_SEC_CTX] ||
35d2856b 214 attrs[XFRMA_TFCPAD] ||
35a7aa08 215 !attrs[XFRMA_COADDR])
e23c7194
MN		 216 goto out;
217 break;
218#endif
219
1da177e4
LT		 220 default:
221 goto out;
3ff50b79 222 }
1da177e4 223
1a6509d9
HX		 224 if ((err = verify_aead(attrs)))
225 goto out;
4447bb33
MW		 226 if ((err = verify_auth_trunc(attrs)))
227 goto out;
35a7aa08 228 if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH)))
1da177e4 229 goto out;
35a7aa08 230 if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT)))
1da177e4 231 goto out;
35a7aa08 232 if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP)))
1da177e4 233 goto out;
35a7aa08 234 if ((err = verify_sec_ctx_len(attrs)))
df71837d 235 goto out;
d8647b79
SK		 236 if ((err = verify_replay(p, attrs)))
237 goto out;
1da177e4
LT		 238
239 err = -EINVAL;
240 switch (p->mode) {
7e49e6de
MN		 241 case XFRM_MODE_TRANSPORT:
242 case XFRM_MODE_TUNNEL:
060f02a3 243 case XFRM_MODE_ROUTEOPTIMIZATION:
0a69452c 244 case XFRM_MODE_BEET:
1da177e4
LT		 245 break;
246
247 default:
248 goto out;
3ff50b79 249 }
1da177e4
LT		 250
251 err = 0;
252
253out:
254 return err;
255}
256
257static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
6f2f19ed 258 struct xfrm_algo_desc *(*get_byname)(const char *, int),
5424f32e 259 struct nlattr *rta)
1da177e4 260{
1da177e4
LT		 261 struct xfrm_algo *p, *ualg;
262 struct xfrm_algo_desc *algo;
263
264 if (!rta)
265 return 0;
266
5424f32e 267 ualg = nla_data(rta);
1da177e4
LT		 268
269 algo = get_byname(ualg->alg_name, 1);
270 if (!algo)
271 return -ENOSYS;
272 *props = algo->desc.sadb_alg_id;
273
0f99be0d 274 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
1da177e4
LT		 275 if (!p)
276 return -ENOMEM;
277
04ff1260 278 strcpy(p->alg_name, algo->name);
1da177e4
LT		 279 *algpp = p;
280 return 0;
281}
282
4447bb33
MW		 283static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,
284 struct nlattr *rta)
285{
286 struct xfrm_algo *ualg;
287 struct xfrm_algo_auth *p;
288 struct xfrm_algo_desc *algo;
289
290 if (!rta)
291 return 0;
292
293 ualg = nla_data(rta);
294
295 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
296 if (!algo)
297 return -ENOSYS;
298 *props = algo->desc.sadb_alg_id;
299
300 p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL);
301 if (!p)
302 return -ENOMEM;
303
304 strcpy(p->alg_name, algo->name);
305 p->alg_key_len = ualg->alg_key_len;
306 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
307 memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8);
308
309 *algpp = p;
310 return 0;
311}
312
313static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,
314 struct nlattr *rta)
315{
316 struct xfrm_algo_auth *p, *ualg;
317 struct xfrm_algo_desc *algo;
318
319 if (!rta)
320 return 0;
321
322 ualg = nla_data(rta);
323
324 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
325 if (!algo)
326 return -ENOSYS;
fa6dd8a2
ND		 327 if ((ualg->alg_trunc_len / 8) > MAX_AH_AUTH_LEN ||
328 ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits)
4447bb33
MW		 329 return -EINVAL;
330 *props = algo->desc.sadb_alg_id;
331
332 p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);
333 if (!p)
334 return -ENOMEM;
335
336 strcpy(p->alg_name, algo->name);
337 if (!p->alg_trunc_len)
338 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
339
340 *algpp = p;
341 return 0;
342}
343
1a6509d9
HX		 344static int attach_aead(struct xfrm_algo_aead **algpp, u8 *props,
345 struct nlattr *rta)
346{
347 struct xfrm_algo_aead *p, *ualg;
348 struct xfrm_algo_desc *algo;
349
350 if (!rta)
351 return 0;
352
353 ualg = nla_data(rta);
354
355 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
356 if (!algo)
357 return -ENOSYS;
358 *props = algo->desc.sadb_alg_id;
359
360 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
361 if (!p)
362 return -ENOMEM;
363
364 strcpy(p->alg_name, algo->name);
365 *algpp = p;
366 return 0;
367}
368
e2b19125
SK		 369static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn,
370 struct nlattr *rp)
371{
372 struct xfrm_replay_state_esn *up;
373
374 if (!replay_esn || !rp)
375 return 0;
376
377 up = nla_data(rp);
378
379 if (xfrm_replay_state_esn_len(replay_esn) !=
380 xfrm_replay_state_esn_len(up))
381 return -EINVAL;
382
383 return 0;
384}
385
d8647b79
SK		 386static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,
387 struct xfrm_replay_state_esn **preplay_esn,
388 struct nlattr *rta)
389{
390 struct xfrm_replay_state_esn *p, *pp, *up;
391
392 if (!rta)
393 return 0;
394
395 up = nla_data(rta);
396
397 p = kmemdup(up, xfrm_replay_state_esn_len(up), GFP_KERNEL);
398 if (!p)
399 return -ENOMEM;
400
401 pp = kmemdup(up, xfrm_replay_state_esn_len(up), GFP_KERNEL);
402 if (!pp) {
403 kfree(p);
404 return -ENOMEM;
405 }
406
407 *replay_esn = p;
408 *preplay_esn = pp;
409
410 return 0;
411}
412
661697f7 413static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
df71837d 414{
df71837d
TJ		 415 int len = 0;
416
417 if (xfrm_ctx) {
418 len += sizeof(struct xfrm_user_sec_ctx);
419 len += xfrm_ctx->ctx_len;
420 }
421 return len;
422}
423
1da177e4
LT		 424static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
425{
426 memcpy(&x->id, &p->id, sizeof(x->id));
427 memcpy(&x->sel, &p->sel, sizeof(x->sel));
428 memcpy(&x->lft, &p->lft, sizeof(x->lft));
429 x->props.mode = p->mode;
430 x->props.replay_window = p->replay_window;
431 x->props.reqid = p->reqid;
432 x->props.family = p->family;
54489c14 433 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
1da177e4 434 x->props.flags = p->flags;
196b0036 435
ccf9b3b8 436 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
196b0036 437 x->sel.family = p->family;
1da177e4
LT		 438}
439
d51d081d
JHS		 440/*
441 * someday when pfkey also has support, we could have the code
442 * somehow made shareable and move it to xfrm_state.c - JHS
443 *
444*/
5424f32e 445static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs)
d51d081d 446{
5424f32e 447 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
d8647b79 448 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
5424f32e
TG		 449 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
450 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
451 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
d51d081d 452
d8647b79
SK		 453 if (re) {
454 struct xfrm_replay_state_esn *replay_esn;
455 replay_esn = nla_data(re);
456 memcpy(x->replay_esn, replay_esn,
457 xfrm_replay_state_esn_len(replay_esn));
458 memcpy(x->preplay_esn, replay_esn,
459 xfrm_replay_state_esn_len(replay_esn));
460 }
461
d51d081d
JHS		 462 if (rp) {
463 struct xfrm_replay_state *replay;
5424f32e 464 replay = nla_data(rp);
d51d081d
JHS		 465 memcpy(&x->replay, replay, sizeof(*replay));
466 memcpy(&x->preplay, replay, sizeof(*replay));
467 }
468
469 if (lt) {
470 struct xfrm_lifetime_cur *ltime;
5424f32e 471 ltime = nla_data(lt);
d51d081d
JHS		 472 x->curlft.bytes = ltime->bytes;
473 x->curlft.packets = ltime->packets;
474 x->curlft.add_time = ltime->add_time;
475 x->curlft.use_time = ltime->use_time;
476 }
477
cf5cb79f 478 if (et)
5424f32e 479 x->replay_maxage = nla_get_u32(et);
d51d081d 480
cf5cb79f 481 if (rt)
5424f32e 482 x->replay_maxdiff = nla_get_u32(rt);
d51d081d
JHS		 483}
484
fc34acd3
AD		 485static struct xfrm_state *xfrm_state_construct(struct net *net,
486 struct xfrm_usersa_info *p,
5424f32e 487 struct nlattr **attrs,
1da177e4
LT		 488 int *errp)
489{
fc34acd3 490 struct xfrm_state *x = xfrm_state_alloc(net);
1da177e4
LT		 491 int err = -ENOMEM;
492
493 if (!x)
494 goto error_no_put;
495
496 copy_from_user_state(x, p);
497
1a6509d9
HX		 498 if ((err = attach_aead(&x->aead, &x->props.ealgo,
499 attrs[XFRMA_ALG_AEAD])))
500 goto error;
4447bb33
MW		 501 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
502 attrs[XFRMA_ALG_AUTH_TRUNC])))
1da177e4 503 goto error;
4447bb33
MW		 504 if (!x->props.aalgo) {
505 if ((err = attach_auth(&x->aalg, &x->props.aalgo,
506 attrs[XFRMA_ALG_AUTH])))
507 goto error;
508 }
1da177e4
LT		 509 if ((err = attach_one_algo(&x->ealg, &x->props.ealgo,
510 xfrm_ealg_get_byname,
35a7aa08 511 attrs[XFRMA_ALG_CRYPT])))
1da177e4
LT		 512 goto error;
513 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
514 xfrm_calg_get_byname,
35a7aa08 515 attrs[XFRMA_ALG_COMP])))
1da177e4 516 goto error;
fd21150a
TG		 517
518 if (attrs[XFRMA_ENCAP]) {
519 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
520 sizeof(*x->encap), GFP_KERNEL);
521 if (x->encap == NULL)
522 goto error;
523 }
524
35d2856b
MW		 525 if (attrs[XFRMA_TFCPAD])
526 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);
527
fd21150a
TG		 528 if (attrs[XFRMA_COADDR]) {
529 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
530 sizeof(*x->coaddr), GFP_KERNEL);
531 if (x->coaddr == NULL)
532 goto error;
533 }
534
6f26b61e
JHS		 535 xfrm_mark_get(attrs, &x->mark);
536
a454f0cc 537 err = __xfrm_init_state(x, false);
1da177e4
LT		 538 if (err)
539 goto error;
540
fd21150a
TG		 541 if (attrs[XFRMA_SEC_CTX] &&
542 security_xfrm_state_alloc(x, nla_data(attrs[XFRMA_SEC_CTX])))
df71837d
TJ		 543 goto error;
544
d8647b79
SK		 545 if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn,
546 attrs[XFRMA_REPLAY_ESN_VAL])))
547 goto error;
548
1da177e4 549 x->km.seq = p->seq;
b27aeadb 550 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
d51d081d 551 /* sysctl_xfrm_aevent_etime is in 100ms units */
b27aeadb 552 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
d51d081d 553
9fdc4883
SK		 554 if ((err = xfrm_init_replay(x)))
555 goto error;
d51d081d 556
9fdc4883 557 /* override default values from above */
5424f32e 558 xfrm_update_ae_params(x, attrs);
1da177e4
LT		 559
560 return x;
561
562error:
563 x->km.state = XFRM_STATE_DEAD;
564 xfrm_state_put(x);
565error_no_put:
566 *errp = err;
567 return NULL;
568}
569
22e70050 570static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 571 struct nlattr **attrs)
1da177e4 572{
fc34acd3 573 struct net *net = sock_net(skb->sk);
7b67c857 574 struct xfrm_usersa_info *p = nlmsg_data(nlh);
1da177e4
LT		 575 struct xfrm_state *x;
576 int err;
26b15dad 577 struct km_event c;
c53fa1ed
PM		 578 uid_t loginuid = audit_get_loginuid(current);
579 u32 sessionid = audit_get_sessionid(current);
580 u32 sid;
1da177e4 581
35a7aa08 582 err = verify_newsa_info(p, attrs);
1da177e4
LT		 583 if (err)
584 return err;
585
fc34acd3 586 x = xfrm_state_construct(net, p, attrs, &err);
1da177e4
LT		 587 if (!x)
588 return err;
589
26b15dad 590 xfrm_state_hold(x);
1da177e4
LT		 591 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
592 err = xfrm_state_add(x);
593 else
594 err = xfrm_state_update(x);
595
c53fa1ed 596 security_task_getsecid(current, &sid);
2532386f 597 xfrm_audit_state_add(x, err ? 0 : 1, loginuid, sessionid, sid);
161a09e7 598
1da177e4
LT		 599 if (err < 0) {
600 x->km.state = XFRM_STATE_DEAD;
21380b81 601 __xfrm_state_put(x);
7d6dfe1f 602 goto out;
1da177e4
LT		 603 }
604
26b15dad
JHS		 605 c.seq = nlh->nlmsg_seq;
606 c.pid = nlh->nlmsg_pid;
f60f6b8f 607 c.event = nlh->nlmsg_type;
26b15dad
JHS		 608
609 km_state_notify(x, &c);
7d6dfe1f 610out:
26b15dad 611 xfrm_state_put(x);
1da177e4
LT		 612 return err;
613}
614
fc34acd3
AD		 615static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
616 struct xfrm_usersa_id *p,
5424f32e 617 struct nlattr **attrs,
eb2971b6
MN		 618 int *errp)
619{
620 struct xfrm_state *x = NULL;
6f26b61e 621 struct xfrm_mark m;
eb2971b6 622 int err;
6f26b61e 623 u32 mark = xfrm_mark_get(attrs, &m);
eb2971b6
MN		 624
625 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
626 err = -ESRCH;
6f26b61e 627 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);
eb2971b6
MN		 628 } else {
629 xfrm_address_t *saddr = NULL;
630
35a7aa08 631 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
eb2971b6
MN		 632 if (!saddr) {
633 err = -EINVAL;
634 goto out;
635 }
636
9abbffee 637 err = -ESRCH;
6f26b61e
JHS		 638 x = xfrm_state_lookup_byaddr(net, mark,
639 &p->daddr, saddr,
221df1ed 640 p->proto, p->family);
eb2971b6
MN		 641 }
642
643 out:
644 if (!x && errp)
645 *errp = err;
646 return x;
647}
648
22e70050 649static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 650 struct nlattr **attrs)
1da177e4 651{
fc34acd3 652 struct net *net = sock_net(skb->sk);
1da177e4 653 struct xfrm_state *x;
eb2971b6 654 int err = -ESRCH;
26b15dad 655 struct km_event c;
7b67c857 656 struct xfrm_usersa_id *p = nlmsg_data(nlh);
c53fa1ed
PM		 657 uid_t loginuid = audit_get_loginuid(current);
658 u32 sessionid = audit_get_sessionid(current);
659 u32 sid;
1da177e4 660
fc34acd3 661 x = xfrm_user_state_lookup(net, p, attrs, &err);
1da177e4 662 if (x == NULL)
eb2971b6 663 return err;
1da177e4 664
6f68dc37 665 if ((err = security_xfrm_state_delete(x)) != 0)
c8c05a8e
CZ		 666 goto out;
667
1da177e4 668 if (xfrm_state_kern(x)) {
c8c05a8e
CZ		 669 err = -EPERM;
670 goto out;
1da177e4
LT		 671 }
672
26b15dad 673 err = xfrm_state_delete(x);
161a09e7 674
c8c05a8e
CZ		 675 if (err < 0)
676 goto out;
26b15dad
JHS		 677
678 c.seq = nlh->nlmsg_seq;
679 c.pid = nlh->nlmsg_pid;
f60f6b8f 680 c.event = nlh->nlmsg_type;
26b15dad 681 km_state_notify(x, &c);
1da177e4 682
c8c05a8e 683out:
c53fa1ed 684 security_task_getsecid(current, &sid);
2532386f 685 xfrm_audit_state_delete(x, err ? 0 : 1, loginuid, sessionid, sid);
c8c05a8e 686 xfrm_state_put(x);
26b15dad 687 return err;
1da177e4
LT		 688}
689
690static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
691{
692 memcpy(&p->id, &x->id, sizeof(p->id));
693 memcpy(&p->sel, &x->sel, sizeof(p->sel));
694 memcpy(&p->lft, &x->lft, sizeof(p->lft));
695 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
696 memcpy(&p->stats, &x->stats, sizeof(p->stats));
54489c14 697 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
1da177e4
LT		 698 p->mode = x->props.mode;
699 p->replay_window = x->props.replay_window;
700 p->reqid = x->props.reqid;
701 p->family = x->props.family;
702 p->flags = x->props.flags;
703 p->seq = x->km.seq;
704}
705
706struct xfrm_dump_info {
707 struct sk_buff *in_skb;
708 struct sk_buff *out_skb;
709 u32 nlmsg_seq;
710 u16 nlmsg_flags;
1da177e4
LT		 711};
712
c0144bea
TG		 713static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
714{
c0144bea
TG		 715 struct xfrm_user_sec_ctx *uctx;
716 struct nlattr *attr;
68325d3b 717 int ctx_size = sizeof(*uctx) + s->ctx_len;
c0144bea
TG		 718
719 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
720 if (attr == NULL)
721 return -EMSGSIZE;
722
723 uctx = nla_data(attr);
724 uctx->exttype = XFRMA_SEC_CTX;
725 uctx->len = ctx_size;
726 uctx->ctx_doi = s->ctx_doi;
727 uctx->ctx_alg = s->ctx_alg;
728 uctx->ctx_len = s->ctx_len;
729 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
730
731 return 0;
732}
733
4447bb33
MW		 734static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
735{
736 struct xfrm_algo *algo;
737 struct nlattr *nla;
738
739 nla = nla_reserve(skb, XFRMA_ALG_AUTH,
740 sizeof(*algo) + (auth->alg_key_len + 7) / 8);
741 if (!nla)
742 return -EMSGSIZE;
743
744 algo = nla_data(nla);
745 strcpy(algo->alg_name, auth->alg_name);
746 memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8);
747 algo->alg_key_len = auth->alg_key_len;
748
749 return 0;
750}
751
68325d3b
HX		 752/* Don't change this without updating xfrm_sa_len! */
753static int copy_to_user_state_extra(struct xfrm_state *x,
754 struct xfrm_usersa_info *p,
755 struct sk_buff *skb)
1da177e4 756{
1da177e4
LT		 757 copy_to_user_state(x, p);
758
050f009e
HX		 759 if (x->coaddr)
760 NLA_PUT(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
761
762 if (x->lastused)
763 NLA_PUT_U64(skb, XFRMA_LASTUSED, x->lastused);
050f009e 764
1a6509d9
HX		 765 if (x->aead)
766 NLA_PUT(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead);
4447bb33
MW		 767 if (x->aalg) {
768 if (copy_to_user_auth(x->aalg, skb))
769 goto nla_put_failure;
770
771 NLA_PUT(skb, XFRMA_ALG_AUTH_TRUNC,
772 xfrm_alg_auth_len(x->aalg), x->aalg);
773 }
1da177e4 774 if (x->ealg)
0f99be0d 775 NLA_PUT(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg);
1da177e4 776 if (x->calg)
c0144bea 777 NLA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
1da177e4
LT		 778
779 if (x->encap)
c0144bea 780 NLA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
1da177e4 781
35d2856b
MW		 782 if (x->tfcpad)
783 NLA_PUT_U32(skb, XFRMA_TFCPAD, x->tfcpad);
784
6f26b61e
JHS		 785 if (xfrm_mark_put(skb, &x->mark))
786 goto nla_put_failure;
787
d8647b79
SK		 788 if (x->replay_esn)
789 NLA_PUT(skb, XFRMA_REPLAY_ESN_VAL,
790 xfrm_replay_state_esn_len(x->replay_esn), x->replay_esn);
791
c0144bea
TG		 792 if (x->security && copy_sec_ctx(x->security, skb) < 0)
793 goto nla_put_failure;
060f02a3 794
68325d3b
HX		 795 return 0;
796
797nla_put_failure:
798 return -EMSGSIZE;
799}
800
801static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
802{
803 struct xfrm_dump_info *sp = ptr;
804 struct sk_buff *in_skb = sp->in_skb;
805 struct sk_buff *skb = sp->out_skb;
806 struct xfrm_usersa_info *p;
807 struct nlmsghdr *nlh;
808 int err;
809
68325d3b
HX		 810 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq,
811 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
812 if (nlh == NULL)
813 return -EMSGSIZE;
814
815 p = nlmsg_data(nlh);
816
817 err = copy_to_user_state_extra(x, p, skb);
818 if (err)
819 goto nla_put_failure;
820
9825069d 821 nlmsg_end(skb, nlh);
1da177e4
LT		 822 return 0;
823
c0144bea 824nla_put_failure:
9825069d 825 nlmsg_cancel(skb, nlh);
68325d3b 826 return err;
1da177e4
LT		 827}
828
4c563f76
TT		 829static int xfrm_dump_sa_done(struct netlink_callback *cb)
830{
831 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
832 xfrm_state_walk_done(walk);
833 return 0;
834}
835
1da177e4
LT		 836static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
837{
fc34acd3 838 struct net *net = sock_net(skb->sk);
4c563f76 839 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
1da177e4
LT		 840 struct xfrm_dump_info info;
841
4c563f76
TT		 842 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
843 sizeof(cb->args) - sizeof(cb->args[0]));
844
1da177e4
LT		 845 info.in_skb = cb->skb;
846 info.out_skb = skb;
847 info.nlmsg_seq = cb->nlh->nlmsg_seq;
848 info.nlmsg_flags = NLM_F_MULTI;
4c563f76
TT		 849
850 if (!cb->args[0]) {
851 cb->args[0] = 1;
852 xfrm_state_walk_init(walk, 0);
853 }
854
fc34acd3 855 (void) xfrm_state_walk(net, walk, dump_one_state, &info);
1da177e4
LT		 856
857 return skb->len;
858}
859
860static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
861 struct xfrm_state *x, u32 seq)
862{
863 struct xfrm_dump_info info;
864 struct sk_buff *skb;
865
7deb2264 866 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1da177e4
LT		 867 if (!skb)
868 return ERR_PTR(-ENOMEM);
869
1da177e4
LT		 870 info.in_skb = in_skb;
871 info.out_skb = skb;
872 info.nlmsg_seq = seq;
873 info.nlmsg_flags = 0;
1da177e4
LT		 874
875 if (dump_one_state(x, 0, &info)) {
876 kfree_skb(skb);
877 return NULL;
878 }
879
880 return skb;
881}
882
7deb2264
TG		 883static inline size_t xfrm_spdinfo_msgsize(void)
884{
885 return NLMSG_ALIGN(4)
886 + nla_total_size(sizeof(struct xfrmu_spdinfo))
887 + nla_total_size(sizeof(struct xfrmu_spdhinfo));
888}
889
e071041b
AD		 890static int build_spdinfo(struct sk_buff *skb, struct net *net,
891 u32 pid, u32 seq, u32 flags)
ecfd6b18 892{
5a6d3416
JHS		 893 struct xfrmk_spdinfo si;
894 struct xfrmu_spdinfo spc;
895 struct xfrmu_spdhinfo sph;
ecfd6b18
JHS		 896 struct nlmsghdr *nlh;
897 u32 *f;
898
899 nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
25985edc 900 if (nlh == NULL) /* shouldn't really happen ... */
ecfd6b18
JHS		 901 return -EMSGSIZE;
902
903 f = nlmsg_data(nlh);
904 *f = flags;
e071041b 905 xfrm_spd_getinfo(net, &si);
5a6d3416
JHS		 906 spc.incnt = si.incnt;
907 spc.outcnt = si.outcnt;
908 spc.fwdcnt = si.fwdcnt;
909 spc.inscnt = si.inscnt;
910 spc.outscnt = si.outscnt;
911 spc.fwdscnt = si.fwdscnt;
912 sph.spdhcnt = si.spdhcnt;
913 sph.spdhmcnt = si.spdhmcnt;
914
915 NLA_PUT(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
916 NLA_PUT(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
ecfd6b18
JHS		 917
918 return nlmsg_end(skb, nlh);
919
920nla_put_failure:
921 nlmsg_cancel(skb, nlh);
922 return -EMSGSIZE;
923}
924
925static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 926 struct nlattr **attrs)
ecfd6b18 927{
a6483b79 928 struct net *net = sock_net(skb->sk);
ecfd6b18 929 struct sk_buff *r_skb;
7b67c857 930 u32 *flags = nlmsg_data(nlh);
ecfd6b18
JHS		 931 u32 spid = NETLINK_CB(skb).pid;
932 u32 seq = nlh->nlmsg_seq;
ecfd6b18 933
7deb2264 934 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
ecfd6b18
JHS		 935 if (r_skb == NULL)
936 return -ENOMEM;
937
e071041b 938 if (build_spdinfo(r_skb, net, spid, seq, *flags) < 0)
ecfd6b18
JHS		 939 BUG();
940
a6483b79 941 return nlmsg_unicast(net->xfrm.nlsk, r_skb, spid);
ecfd6b18
JHS		 942}
943
7deb2264
TG		 944static inline size_t xfrm_sadinfo_msgsize(void)
945{
946 return NLMSG_ALIGN(4)
947 + nla_total_size(sizeof(struct xfrmu_sadhinfo))
948 + nla_total_size(4); /* XFRMA_SAD_CNT */
949}
950
e071041b
AD		 951static int build_sadinfo(struct sk_buff *skb, struct net *net,
952 u32 pid, u32 seq, u32 flags)
28d8909b 953{
af11e316
JHS		 954 struct xfrmk_sadinfo si;
955 struct xfrmu_sadhinfo sh;
28d8909b
JHS		 956 struct nlmsghdr *nlh;
957 u32 *f;
958
959 nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
25985edc 960 if (nlh == NULL) /* shouldn't really happen ... */
28d8909b
JHS		 961 return -EMSGSIZE;
962
963 f = nlmsg_data(nlh);
964 *f = flags;
e071041b 965 xfrm_sad_getinfo(net, &si);
28d8909b 966
af11e316
JHS		 967 sh.sadhmcnt = si.sadhmcnt;
968 sh.sadhcnt = si.sadhcnt;
969
970 NLA_PUT_U32(skb, XFRMA_SAD_CNT, si.sadcnt);
971 NLA_PUT(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
28d8909b
JHS		 972
973 return nlmsg_end(skb, nlh);
974
975nla_put_failure:
976 nlmsg_cancel(skb, nlh);
977 return -EMSGSIZE;
978}
979
980static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 981 struct nlattr **attrs)
28d8909b 982{
a6483b79 983 struct net *net = sock_net(skb->sk);
28d8909b 984 struct sk_buff *r_skb;
7b67c857 985 u32 *flags = nlmsg_data(nlh);
28d8909b
JHS		 986 u32 spid = NETLINK_CB(skb).pid;
987 u32 seq = nlh->nlmsg_seq;
28d8909b 988
7deb2264 989 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
28d8909b
JHS		 990 if (r_skb == NULL)
991 return -ENOMEM;
992
e071041b 993 if (build_sadinfo(r_skb, net, spid, seq, *flags) < 0)
28d8909b
JHS		 994 BUG();
995
a6483b79 996 return nlmsg_unicast(net->xfrm.nlsk, r_skb, spid);
28d8909b
JHS		 997}
998
22e70050 999static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1000 struct nlattr **attrs)
1da177e4 1001{
fc34acd3 1002 struct net *net = sock_net(skb->sk);
7b67c857 1003 struct xfrm_usersa_id *p = nlmsg_data(nlh);
1da177e4
LT		 1004 struct xfrm_state *x;
1005 struct sk_buff *resp_skb;
eb2971b6 1006 int err = -ESRCH;
1da177e4 1007
fc34acd3 1008 x = xfrm_user_state_lookup(net, p, attrs, &err);
1da177e4
LT		 1009 if (x == NULL)
1010 goto out_noput;
1011
1012 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1013 if (IS_ERR(resp_skb)) {
1014 err = PTR_ERR(resp_skb);
1015 } else {
a6483b79 1016 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).pid);
1da177e4
LT		 1017 }
1018 xfrm_state_put(x);
1019out_noput:
1020 return err;
1021}
1022
1023static int verify_userspi_info(struct xfrm_userspi_info *p)
1024{
1025 switch (p->info.id.proto) {
1026 case IPPROTO_AH:
1027 case IPPROTO_ESP:
1028 break;
1029
1030 case IPPROTO_COMP:
1031 /* IPCOMP spi is 16-bits. */
1032 if (p->max >= 0x10000)
1033 return -EINVAL;
1034 break;
1035
1036 default:
1037 return -EINVAL;
3ff50b79 1038 }
1da177e4
LT		 1039
1040 if (p->min > p->max)
1041 return -EINVAL;
1042
1043 return 0;
1044}
1045
22e70050 1046static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1047 struct nlattr **attrs)
1da177e4 1048{
fc34acd3 1049 struct net *net = sock_net(skb->sk);
1da177e4
LT		 1050 struct xfrm_state *x;
1051 struct xfrm_userspi_info *p;
1052 struct sk_buff *resp_skb;
1053 xfrm_address_t *daddr;
1054 int family;
1055 int err;
6f26b61e
JHS		 1056 u32 mark;
1057 struct xfrm_mark m;
1da177e4 1058
7b67c857 1059 p = nlmsg_data(nlh);
1da177e4
LT		 1060 err = verify_userspi_info(p);
1061 if (err)
1062 goto out_noput;
1063
1064 family = p->info.family;
1065 daddr = &p->info.id.daddr;
1066
1067 x = NULL;
6f26b61e
JHS		 1068
1069 mark = xfrm_mark_get(attrs, &m);
1da177e4 1070 if (p->info.seq) {
6f26b61e 1071 x = xfrm_find_acq_byseq(net, mark, p->info.seq);
1da177e4
LT		 1072 if (x && xfrm_addr_cmp(&x->id.daddr, daddr, family)) {
1073 xfrm_state_put(x);
1074 x = NULL;
1075 }
1076 }
1077
1078 if (!x)
6f26b61e 1079 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1da177e4
LT		 1080 p->info.id.proto, daddr,
1081 &p->info.saddr, 1,
1082 family);
1083 err = -ENOENT;
1084 if (x == NULL)
1085 goto out_noput;
1086
658b219e
HX		 1087 err = xfrm_alloc_spi(x, p->min, p->max);
1088 if (err)
1089 goto out;
1da177e4 1090
658b219e 1091 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1da177e4
LT		 1092 if (IS_ERR(resp_skb)) {
1093 err = PTR_ERR(resp_skb);
1094 goto out;
1095 }
1096
a6483b79 1097 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).pid);
1da177e4
LT		 1098
1099out:
1100 xfrm_state_put(x);
1101out_noput:
1102 return err;
1103}
1104
b798a9ed 1105static int verify_policy_dir(u8 dir)
1da177e4
LT		 1106{
1107 switch (dir) {
1108 case XFRM_POLICY_IN:
1109 case XFRM_POLICY_OUT:
1110 case XFRM_POLICY_FWD:
1111 break;
1112
1113 default:
1114 return -EINVAL;
3ff50b79 1115 }
1da177e4
LT		 1116
1117 return 0;
1118}
1119
b798a9ed 1120static int verify_policy_type(u8 type)
f7b6983f
MN		 1121{
1122 switch (type) {
1123 case XFRM_POLICY_TYPE_MAIN:
1124#ifdef CONFIG_XFRM_SUB_POLICY
1125 case XFRM_POLICY_TYPE_SUB:
1126#endif
1127 break;
1128
1129 default:
1130 return -EINVAL;
3ff50b79 1131 }
f7b6983f
MN		 1132
1133 return 0;
1134}
1135
1da177e4
LT		 1136static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
1137{
1138 switch (p->share) {
1139 case XFRM_SHARE_ANY:
1140 case XFRM_SHARE_SESSION:
1141 case XFRM_SHARE_USER:
1142 case XFRM_SHARE_UNIQUE:
1143 break;
1144
1145 default:
1146 return -EINVAL;
3ff50b79 1147 }
1da177e4
LT		 1148
1149 switch (p->action) {
1150 case XFRM_POLICY_ALLOW:
1151 case XFRM_POLICY_BLOCK:
1152 break;
1153
1154 default:
1155 return -EINVAL;
3ff50b79 1156 }
1da177e4
LT		 1157
1158 switch (p->sel.family) {
1159 case AF_INET:
1160 break;
1161
1162 case AF_INET6:
dfd56b8b 1163#if IS_ENABLED(CONFIG_IPV6)
1da177e4
LT		 1164 break;
1165#else
1166 return -EAFNOSUPPORT;
1167#endif
1168
1169 default:
1170 return -EINVAL;
3ff50b79 1171 }
1da177e4
LT		 1172
1173 return verify_policy_dir(p->dir);
1174}
1175
5424f32e 1176static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
df71837d 1177{
5424f32e 1178 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
df71837d
TJ		 1179 struct xfrm_user_sec_ctx *uctx;
1180
1181 if (!rt)
1182 return 0;
1183
5424f32e 1184 uctx = nla_data(rt);
03e1ad7b 1185 return security_xfrm_policy_alloc(&pol->security, uctx);
df71837d
TJ		 1186}
1187
1da177e4
LT		 1188static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1189 int nr)
1190{
1191 int i;
1192
1193 xp->xfrm_nr = nr;
1194 for (i = 0; i < nr; i++, ut++) {
1195 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1196
1197 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1198 memcpy(&t->saddr, &ut->saddr,
1199 sizeof(xfrm_address_t));
1200 t->reqid = ut->reqid;
1201 t->mode = ut->mode;
1202 t->share = ut->share;
1203 t->optional = ut->optional;
1204 t->aalgos = ut->aalgos;
1205 t->ealgos = ut->ealgos;
1206 t->calgos = ut->calgos;
c5d18e98
HX		 1207 /* If all masks are ~0, then we allow all algorithms. */
1208 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
8511d01d 1209 t->encap_family = ut->family;
1da177e4
LT		 1210 }
1211}
1212
b4ad86bf
DM		 1213static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
1214{
1215 int i;
1216
1217 if (nr > XFRM_MAX_DEPTH)
1218 return -EINVAL;
1219
1220 for (i = 0; i < nr; i++) {
1221 /* We never validated the ut->family value, so many
1222 * applications simply leave it at zero. The check was
1223 * never made and ut->family was ignored because all
1224 * templates could be assumed to have the same family as
1225 * the policy itself. Now that we will have ipv4-in-ipv6
1226 * and ipv6-in-ipv4 tunnels, this is no longer true.
1227 */
1228 if (!ut[i].family)
1229 ut[i].family = family;
1230
1231 switch (ut[i].family) {
1232 case AF_INET:
1233 break;
dfd56b8b 1234#if IS_ENABLED(CONFIG_IPV6)
b4ad86bf
DM		 1235 case AF_INET6:
1236 break;
1237#endif
1238 default:
1239 return -EINVAL;
3ff50b79 1240 }
b4ad86bf
DM		 1241 }
1242
1243 return 0;
1244}
1245
5424f32e 1246static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1da177e4 1247{
5424f32e 1248 struct nlattr *rt = attrs[XFRMA_TMPL];
1da177e4
LT		 1249
1250 if (!rt) {
1251 pol->xfrm_nr = 0;
1252 } else {
5424f32e
TG		 1253 struct xfrm_user_tmpl *utmpl = nla_data(rt);
1254 int nr = nla_len(rt) / sizeof(*utmpl);
b4ad86bf 1255 int err;
1da177e4 1256
b4ad86bf
DM		 1257 err = validate_tmpl(nr, utmpl, pol->family);
1258 if (err)
1259 return err;
1da177e4 1260
5424f32e 1261 copy_templates(pol, utmpl, nr);
1da177e4
LT		 1262 }
1263 return 0;
1264}
1265
5424f32e 1266static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
f7b6983f 1267{
5424f32e 1268 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
f7b6983f 1269 struct xfrm_userpolicy_type *upt;
b798a9ed 1270 u8 type = XFRM_POLICY_TYPE_MAIN;
f7b6983f
MN		 1271 int err;
1272
1273 if (rt) {
5424f32e 1274 upt = nla_data(rt);
f7b6983f
MN		 1275 type = upt->type;
1276 }
1277
1278 err = verify_policy_type(type);
1279 if (err)
1280 return err;
1281
1282 *tp = type;
1283 return 0;
1284}
1285
1da177e4
LT		 1286static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1287{
1288 xp->priority = p->priority;
1289 xp->index = p->index;
1290 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1291 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1292 xp->action = p->action;
1293 xp->flags = p->flags;
1294 xp->family = p->sel.family;
1295 /* XXX xp->share = p->share; */
1296}
1297
1298static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1299{
1300 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1301 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1302 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1303 p->priority = xp->priority;
1304 p->index = xp->index;
1305 p->sel.family = xp->family;
1306 p->dir = dir;
1307 p->action = xp->action;
1308 p->flags = xp->flags;
1309 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1310}
1311
fc34acd3 1312static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1da177e4 1313{
fc34acd3 1314 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
1da177e4
LT		 1315 int err;
1316
1317 if (!xp) {
1318 *errp = -ENOMEM;
1319 return NULL;
1320 }
1321
1322 copy_from_user_policy(xp, p);
df71837d 1323
35a7aa08 1324 err = copy_from_user_policy_type(&xp->type, attrs);
f7b6983f
MN		 1325 if (err)
1326 goto error;
1327
35a7aa08
TG		 1328 if (!(err = copy_from_user_tmpl(xp, attrs)))
1329 err = copy_from_user_sec_ctx(xp, attrs);
f7b6983f
MN		 1330 if (err)
1331 goto error;
1da177e4 1332
295fae56
JHS		 1333 xfrm_mark_get(attrs, &xp->mark);
1334
1da177e4 1335 return xp;
f7b6983f
MN		 1336 error:
1337 *errp = err;
12a169e7 1338 xp->walk.dead = 1;
64c31b3f 1339 xfrm_policy_destroy(xp);
f7b6983f 1340 return NULL;
1da177e4
LT		 1341}
1342
22e70050 1343static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1344 struct nlattr **attrs)
1da177e4 1345{
fc34acd3 1346 struct net *net = sock_net(skb->sk);
7b67c857 1347 struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1da177e4 1348 struct xfrm_policy *xp;
26b15dad 1349 struct km_event c;
1da177e4
LT		 1350 int err;
1351 int excl;
c53fa1ed
PM		 1352 uid_t loginuid = audit_get_loginuid(current);
1353 u32 sessionid = audit_get_sessionid(current);
1354 u32 sid;
1da177e4
LT		 1355
1356 err = verify_newpolicy_info(p);
df71837d
TJ		 1357 if (err)
1358 return err;
35a7aa08 1359 err = verify_sec_ctx_len(attrs);
1da177e4
LT		 1360 if (err)
1361 return err;
1362
fc34acd3 1363 xp = xfrm_policy_construct(net, p, attrs, &err);
1da177e4
LT		 1364 if (!xp)
1365 return err;
1366
25985edc 1367 /* shouldn't excl be based on nlh flags??
26b15dad
JHS		 1368 * Aha! this is anti-netlink really i.e more pfkey derived
1369 * in netlink excl is a flag and you wouldnt need
1370 * a type XFRM_MSG_UPDPOLICY - JHS */
1da177e4
LT		 1371 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1372 err = xfrm_policy_insert(p->dir, xp, excl);
c53fa1ed 1373 security_task_getsecid(current, &sid);
2532386f 1374 xfrm_audit_policy_add(xp, err ? 0 : 1, loginuid, sessionid, sid);
161a09e7 1375
1da177e4 1376 if (err) {
03e1ad7b 1377 security_xfrm_policy_free(xp->security);
1da177e4
LT		 1378 kfree(xp);
1379 return err;
1380 }
1381
f60f6b8f 1382 c.event = nlh->nlmsg_type;
26b15dad
JHS		 1383 c.seq = nlh->nlmsg_seq;
1384 c.pid = nlh->nlmsg_pid;
1385 km_policy_notify(xp, p->dir, &c);
1386
1da177e4
LT		 1387 xfrm_pol_put(xp);
1388
1389 return 0;
1390}
1391
1392static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1393{
1394 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1395 int i;
1396
1397 if (xp->xfrm_nr == 0)
1398 return 0;
1399
1400 for (i = 0; i < xp->xfrm_nr; i++) {
1401 struct xfrm_user_tmpl *up = &vec[i];
1402 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1403
1404 memcpy(&up->id, &kp->id, sizeof(up->id));
8511d01d 1405 up->family = kp->encap_family;
1da177e4
LT		 1406 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1407 up->reqid = kp->reqid;
1408 up->mode = kp->mode;
1409 up->share = kp->share;
1410 up->optional = kp->optional;
1411 up->aalgos = kp->aalgos;
1412 up->ealgos = kp->ealgos;
1413 up->calgos = kp->calgos;
1414 }
df71837d 1415
c0144bea
TG		 1416 return nla_put(skb, XFRMA_TMPL,
1417 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
0d681623
SH		 1418}
1419
1420static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1421{
1422 if (x->security) {
1423 return copy_sec_ctx(x->security, skb);
df71837d
TJ		 1424 }
1425 return 0;
0d681623 1426}
df71837d 1427
0d681623
SH		 1428static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1429{
1430 if (xp->security) {
1431 return copy_sec_ctx(xp->security, skb);
1432 }
1433 return 0;
df71837d 1434}
cfbfd45a
TG		 1435static inline size_t userpolicy_type_attrsize(void)
1436{
1437#ifdef CONFIG_XFRM_SUB_POLICY
1438 return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1439#else
1440 return 0;
1441#endif
1442}
df71837d 1443
f7b6983f 1444#ifdef CONFIG_XFRM_SUB_POLICY
b798a9ed 1445static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
f7b6983f 1446{
c0144bea
TG		 1447 struct xfrm_userpolicy_type upt = {
1448 .type = type,
1449 };
f7b6983f 1450
c0144bea 1451 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
f7b6983f
MN		 1452}
1453
1454#else
b798a9ed 1455static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
f7b6983f
MN		 1456{
1457 return 0;
1458}
1459#endif
1460
1da177e4
LT		 1461static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1462{
1463 struct xfrm_dump_info *sp = ptr;
1464 struct xfrm_userpolicy_info *p;
1465 struct sk_buff *in_skb = sp->in_skb;
1466 struct sk_buff *skb = sp->out_skb;
1467 struct nlmsghdr *nlh;
1da177e4 1468
79b8b7f4
TG		 1469 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq,
1470 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1471 if (nlh == NULL)
1472 return -EMSGSIZE;
1da177e4 1473
7b67c857 1474 p = nlmsg_data(nlh);
1da177e4
LT		 1475 copy_to_user_policy(xp, p, dir);
1476 if (copy_to_user_tmpl(xp, skb) < 0)
1477 goto nlmsg_failure;
df71837d
TJ		 1478 if (copy_to_user_sec_ctx(xp, skb))
1479 goto nlmsg_failure;
1459bb36 1480 if (copy_to_user_policy_type(xp->type, skb) < 0)
f7b6983f 1481 goto nlmsg_failure;
295fae56
JHS		 1482 if (xfrm_mark_put(skb, &xp->mark))
1483 goto nla_put_failure;
1da177e4 1484
9825069d 1485 nlmsg_end(skb, nlh);
1da177e4
LT		 1486 return 0;
1487
295fae56 1488nla_put_failure:
1da177e4 1489nlmsg_failure:
9825069d
TG		 1490 nlmsg_cancel(skb, nlh);
1491 return -EMSGSIZE;
1da177e4
LT		 1492}
1493
4c563f76
TT		 1494static int xfrm_dump_policy_done(struct netlink_callback *cb)
1495{
1496 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1497
1498 xfrm_policy_walk_done(walk);
1499 return 0;
1500}
1501
1da177e4
LT		 1502static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1503{
fc34acd3 1504 struct net *net = sock_net(skb->sk);
4c563f76 1505 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1da177e4
LT		 1506 struct xfrm_dump_info info;
1507
4c563f76
TT		 1508 BUILD_BUG_ON(sizeof(struct xfrm_policy_walk) >
1509 sizeof(cb->args) - sizeof(cb->args[0]));
1510
1da177e4
LT		 1511 info.in_skb = cb->skb;
1512 info.out_skb = skb;
1513 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1514 info.nlmsg_flags = NLM_F_MULTI;
4c563f76
TT		 1515
1516 if (!cb->args[0]) {
1517 cb->args[0] = 1;
1518 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1519 }
1520
fc34acd3 1521 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
1da177e4
LT		 1522
1523 return skb->len;
1524}
1525
1526static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1527 struct xfrm_policy *xp,
1528 int dir, u32 seq)
1529{
1530 struct xfrm_dump_info info;
1531 struct sk_buff *skb;
1532
7deb2264 1533 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1da177e4
LT		 1534 if (!skb)
1535 return ERR_PTR(-ENOMEM);
1536
1da177e4
LT		 1537 info.in_skb = in_skb;
1538 info.out_skb = skb;
1539 info.nlmsg_seq = seq;
1540 info.nlmsg_flags = 0;
1da177e4
LT		 1541
1542 if (dump_one_policy(xp, dir, 0, &info) < 0) {
1543 kfree_skb(skb);
1544 return NULL;
1545 }
1546
1547 return skb;
1548}
1549
22e70050 1550static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1551 struct nlattr **attrs)
1da177e4 1552{
fc34acd3 1553 struct net *net = sock_net(skb->sk);
1da177e4
LT		 1554 struct xfrm_policy *xp;
1555 struct xfrm_userpolicy_id *p;
b798a9ed 1556 u8 type = XFRM_POLICY_TYPE_MAIN;
1da177e4 1557 int err;
26b15dad 1558 struct km_event c;
1da177e4 1559 int delete;
295fae56
JHS		 1560 struct xfrm_mark m;
1561 u32 mark = xfrm_mark_get(attrs, &m);
1da177e4 1562
7b67c857 1563 p = nlmsg_data(nlh);
1da177e4
LT		 1564 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1565
35a7aa08 1566 err = copy_from_user_policy_type(&type, attrs);
f7b6983f
MN		 1567 if (err)
1568 return err;
1569
1da177e4
LT		 1570 err = verify_policy_dir(p->dir);
1571 if (err)
1572 return err;
1573
1574 if (p->index)
295fae56 1575 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err);
df71837d 1576 else {
5424f32e 1577 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
03e1ad7b 1578 struct xfrm_sec_ctx *ctx;
df71837d 1579
35a7aa08 1580 err = verify_sec_ctx_len(attrs);
df71837d
TJ		 1581 if (err)
1582 return err;
1583
2c8dd116 1584 ctx = NULL;
df71837d 1585 if (rt) {
5424f32e 1586 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
df71837d 1587
03e1ad7b
PM		 1588 err = security_xfrm_policy_alloc(&ctx, uctx);
1589 if (err)
df71837d 1590 return err;
2c8dd116 1591 }
295fae56 1592 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel,
6f26b61e 1593 ctx, delete, &err);
03e1ad7b 1594 security_xfrm_policy_free(ctx);
df71837d 1595 }
1da177e4
LT		 1596 if (xp == NULL)
1597 return -ENOENT;
1598
1599 if (!delete) {
1600 struct sk_buff *resp_skb;
1601
1602 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1603 if (IS_ERR(resp_skb)) {
1604 err = PTR_ERR(resp_skb);
1605 } else {
a6483b79 1606 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
082a1ad5 1607 NETLINK_CB(skb).pid);
1da177e4 1608 }
26b15dad 1609 } else {
c53fa1ed
PM		 1610 uid_t loginuid = audit_get_loginuid(current);
1611 u32 sessionid = audit_get_sessionid(current);
1612 u32 sid;
2532386f 1613
c53fa1ed 1614 security_task_getsecid(current, &sid);
2532386f
EP		 1615 xfrm_audit_policy_delete(xp, err ? 0 : 1, loginuid, sessionid,
1616 sid);
13fcfbb0
DM		 1617
1618 if (err != 0)
c8c05a8e 1619 goto out;
13fcfbb0 1620
e7443892 1621 c.data.byid = p->index;
f60f6b8f 1622 c.event = nlh->nlmsg_type;
26b15dad
JHS		 1623 c.seq = nlh->nlmsg_seq;
1624 c.pid = nlh->nlmsg_pid;
1625 km_policy_notify(xp, p->dir, &c);
1da177e4
LT		 1626 }
1627
c8c05a8e 1628out:
ef41aaa0 1629 xfrm_pol_put(xp);
1da177e4
LT		 1630 return err;
1631}
1632
22e70050 1633static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1634 struct nlattr **attrs)
1da177e4 1635{
fc34acd3 1636 struct net *net = sock_net(skb->sk);
26b15dad 1637 struct km_event c;
7b67c857 1638 struct xfrm_usersa_flush *p = nlmsg_data(nlh);
161a09e7 1639 struct xfrm_audit audit_info;
4aa2e62c 1640 int err;
1da177e4 1641
c53fa1ed
PM		 1642 audit_info.loginuid = audit_get_loginuid(current);
1643 audit_info.sessionid = audit_get_sessionid(current);
1644 security_task_getsecid(current, &audit_info.secid);
fc34acd3 1645 err = xfrm_state_flush(net, p->proto, &audit_info);
9e64cc95
JHS		 1646 if (err) {
1647 if (err == -ESRCH) /* empty table */
1648 return 0;
069c474e 1649 return err;
9e64cc95 1650 }
bf08867f 1651 c.data.proto = p->proto;
f60f6b8f 1652 c.event = nlh->nlmsg_type;
26b15dad
JHS		 1653 c.seq = nlh->nlmsg_seq;
1654 c.pid = nlh->nlmsg_pid;
7067802e 1655 c.net = net;
26b15dad
JHS		 1656 km_state_notify(NULL, &c);
1657
1da177e4
LT		 1658 return 0;
1659}
1660
d8647b79 1661static inline size_t xfrm_aevent_msgsize(struct xfrm_state *x)
7deb2264 1662{
d8647b79
SK		 1663 size_t replay_size = x->replay_esn ?
1664 xfrm_replay_state_esn_len(x->replay_esn) :
1665 sizeof(struct xfrm_replay_state);
1666
7deb2264 1667 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
d8647b79 1668 + nla_total_size(replay_size)
7deb2264 1669 + nla_total_size(sizeof(struct xfrm_lifetime_cur))
6f26b61e 1670 + nla_total_size(sizeof(struct xfrm_mark))
7deb2264
TG		 1671 + nla_total_size(4) /* XFRM_AE_RTHR */
1672 + nla_total_size(4); /* XFRM_AE_ETHR */
1673}
d51d081d 1674
214e005b 1675static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
d51d081d
JHS		 1676{
1677 struct xfrm_aevent_id *id;
1678 struct nlmsghdr *nlh;
d51d081d 1679
79b8b7f4
TG		 1680 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
1681 if (nlh == NULL)
1682 return -EMSGSIZE;
d51d081d 1683
7b67c857 1684 id = nlmsg_data(nlh);
2b5f6dcc 1685 memcpy(&id->sa_id.daddr, &x->id.daddr,sizeof(x->id.daddr));
d51d081d
JHS		 1686 id->sa_id.spi = x->id.spi;
1687 id->sa_id.family = x->props.family;
1688 id->sa_id.proto = x->id.proto;
2b5f6dcc
JHS		 1689 memcpy(&id->saddr, &x->props.saddr,sizeof(x->props.saddr));
1690 id->reqid = x->props.reqid;
d51d081d
JHS		 1691 id->flags = c->data.aevent;
1692
d8647b79
SK		 1693 if (x->replay_esn)
1694 NLA_PUT(skb, XFRMA_REPLAY_ESN_VAL,
1695 xfrm_replay_state_esn_len(x->replay_esn),
1696 x->replay_esn);
1697 else
1698 NLA_PUT(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), &x->replay);
1699
c0144bea 1700 NLA_PUT(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft);
d51d081d 1701
c0144bea
TG		 1702 if (id->flags & XFRM_AE_RTHR)
1703 NLA_PUT_U32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
d51d081d 1704
c0144bea
TG		 1705 if (id->flags & XFRM_AE_ETHR)
1706 NLA_PUT_U32(skb, XFRMA_ETIMER_THRESH,
1707 x->replay_maxage * 10 / HZ);
d51d081d 1708
6f26b61e
JHS		 1709 if (xfrm_mark_put(skb, &x->mark))
1710 goto nla_put_failure;
1711
9825069d 1712 return nlmsg_end(skb, nlh);
d51d081d 1713
c0144bea 1714nla_put_failure:
9825069d
TG		 1715 nlmsg_cancel(skb, nlh);
1716 return -EMSGSIZE;
d51d081d
JHS		 1717}
1718
22e70050 1719static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1720 struct nlattr **attrs)
d51d081d 1721{
fc34acd3 1722 struct net *net = sock_net(skb->sk);
d51d081d
JHS		 1723 struct xfrm_state *x;
1724 struct sk_buff *r_skb;
1725 int err;
1726 struct km_event c;
6f26b61e
JHS		 1727 u32 mark;
1728 struct xfrm_mark m;
7b67c857 1729 struct xfrm_aevent_id *p = nlmsg_data(nlh);
d51d081d
JHS		 1730 struct xfrm_usersa_id *id = &p->sa_id;
1731
6f26b61e
JHS		 1732 mark = xfrm_mark_get(attrs, &m);
1733
1734 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
d8647b79 1735 if (x == NULL)
d51d081d 1736 return -ESRCH;
d8647b79
SK		 1737
1738 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
1739 if (r_skb == NULL) {
1740 xfrm_state_put(x);
1741 return -ENOMEM;
d51d081d
JHS		 1742 }
1743
1744 /*
1745 * XXX: is this lock really needed - none of the other
1746 * gets lock (the concern is things getting updated
1747 * while we are still reading) - jhs
1748 */
1749 spin_lock_bh(&x->lock);
1750 c.data.aevent = p->flags;
1751 c.seq = nlh->nlmsg_seq;
1752 c.pid = nlh->nlmsg_pid;
1753
1754 if (build_aevent(r_skb, x, &c) < 0)
1755 BUG();
a6483b79 1756 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).pid);
d51d081d
JHS		 1757 spin_unlock_bh(&x->lock);
1758 xfrm_state_put(x);
1759 return err;
1760}
1761
22e70050 1762static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1763 struct nlattr **attrs)
d51d081d 1764{
fc34acd3 1765 struct net *net = sock_net(skb->sk);
d51d081d
JHS		 1766 struct xfrm_state *x;
1767 struct km_event c;
1768 int err = - EINVAL;
6f26b61e
JHS		 1769 u32 mark = 0;
1770 struct xfrm_mark m;
7b67c857 1771 struct xfrm_aevent_id *p = nlmsg_data(nlh);
5424f32e 1772 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
d8647b79 1773 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
5424f32e 1774 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
d51d081d 1775
d8647b79 1776 if (!lt && !rp && !re)
d51d081d
JHS		 1777 return err;
1778
1779 /* pedantic mode - thou shalt sayeth replaceth */
1780 if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
1781 return err;
1782
6f26b61e
JHS		 1783 mark = xfrm_mark_get(attrs, &m);
1784
1785 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
d51d081d
JHS		 1786 if (x == NULL)
1787 return -ESRCH;
1788
1789 if (x->km.state != XFRM_STATE_VALID)
1790 goto out;
1791
e2b19125
SK		 1792 err = xfrm_replay_verify_len(x->replay_esn, rp);
1793 if (err)
1794 goto out;
1795
d51d081d 1796 spin_lock_bh(&x->lock);
35a7aa08 1797 xfrm_update_ae_params(x, attrs);
d51d081d 1798 spin_unlock_bh(&x->lock);
d51d081d
JHS		 1799
1800 c.event = nlh->nlmsg_type;
1801 c.seq = nlh->nlmsg_seq;
1802 c.pid = nlh->nlmsg_pid;
1803 c.data.aevent = XFRM_AE_CU;
1804 km_state_notify(x, &c);
1805 err = 0;
1806out:
1807 xfrm_state_put(x);
1808 return err;
1809}
1810
22e70050 1811static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1812 struct nlattr **attrs)
1da177e4 1813{
fc34acd3 1814 struct net *net = sock_net(skb->sk);
f7b6983f 1815 struct km_event c;
b798a9ed 1816 u8 type = XFRM_POLICY_TYPE_MAIN;
f7b6983f 1817 int err;
161a09e7 1818 struct xfrm_audit audit_info;
f7b6983f 1819
35a7aa08 1820 err = copy_from_user_policy_type(&type, attrs);
f7b6983f
MN		 1821 if (err)
1822 return err;
26b15dad 1823
c53fa1ed
PM		 1824 audit_info.loginuid = audit_get_loginuid(current);
1825 audit_info.sessionid = audit_get_sessionid(current);
1826 security_task_getsecid(current, &audit_info.secid);
fc34acd3 1827 err = xfrm_policy_flush(net, type, &audit_info);
2f1eb65f
JHS		 1828 if (err) {
1829 if (err == -ESRCH) /* empty table */
1830 return 0;
069c474e 1831 return err;
2f1eb65f
JHS		 1832 }
1833
f7b6983f 1834 c.data.type = type;
f60f6b8f 1835 c.event = nlh->nlmsg_type;
26b15dad
JHS		 1836 c.seq = nlh->nlmsg_seq;
1837 c.pid = nlh->nlmsg_pid;
7067802e 1838 c.net = net;
26b15dad 1839 km_policy_notify(NULL, 0, &c);
1da177e4
LT		 1840 return 0;
1841}
1842
22e70050 1843static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1844 struct nlattr **attrs)
6c5c8ca7 1845{
fc34acd3 1846 struct net *net = sock_net(skb->sk);
6c5c8ca7 1847 struct xfrm_policy *xp;
7b67c857 1848 struct xfrm_user_polexpire *up = nlmsg_data(nlh);
6c5c8ca7 1849 struct xfrm_userpolicy_info *p = &up->pol;
b798a9ed 1850 u8 type = XFRM_POLICY_TYPE_MAIN;
6c5c8ca7 1851 int err = -ENOENT;
295fae56
JHS		 1852 struct xfrm_mark m;
1853 u32 mark = xfrm_mark_get(attrs, &m);
6c5c8ca7 1854
35a7aa08 1855 err = copy_from_user_policy_type(&type, attrs);
f7b6983f
MN		 1856 if (err)
1857 return err;
1858
c8bf4d04
TT		 1859 err = verify_policy_dir(p->dir);
1860 if (err)
1861 return err;
1862
6c5c8ca7 1863 if (p->index)
295fae56 1864 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err);
6c5c8ca7 1865 else {
5424f32e 1866 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
03e1ad7b 1867 struct xfrm_sec_ctx *ctx;
6c5c8ca7 1868
35a7aa08 1869 err = verify_sec_ctx_len(attrs);
6c5c8ca7
JHS		 1870 if (err)
1871 return err;
1872
2c8dd116 1873 ctx = NULL;
6c5c8ca7 1874 if (rt) {
5424f32e 1875 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
6c5c8ca7 1876
03e1ad7b
PM		 1877 err = security_xfrm_policy_alloc(&ctx, uctx);
1878 if (err)
6c5c8ca7 1879 return err;
2c8dd116 1880 }
295fae56 1881 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir,
6f26b61e 1882 &p->sel, ctx, 0, &err);
03e1ad7b 1883 security_xfrm_policy_free(ctx);
6c5c8ca7 1884 }
6c5c8ca7 1885 if (xp == NULL)
ef41aaa0 1886 return -ENOENT;
03e1ad7b 1887
ea2dea9d 1888 if (unlikely(xp->walk.dead))
6c5c8ca7 1889 goto out;
6c5c8ca7 1890
6c5c8ca7
JHS		 1891 err = 0;
1892 if (up->hard) {
c53fa1ed
PM		 1893 uid_t loginuid = audit_get_loginuid(current);
1894 u32 sessionid = audit_get_sessionid(current);
1895 u32 sid;
1896
1897 security_task_getsecid(current, &sid);
6c5c8ca7 1898 xfrm_policy_delete(xp, p->dir);
2532386f 1899 xfrm_audit_policy_delete(xp, 1, loginuid, sessionid, sid);
161a09e7 1900
6c5c8ca7
JHS		 1901 } else {
1902 // reset the timers here?
62db5cfd 1903 WARN(1, "Dont know what to do with soft policy expire\n");
6c5c8ca7
JHS		 1904 }
1905 km_policy_expired(xp, p->dir, up->hard, current->pid);
1906
1907out:
1908 xfrm_pol_put(xp);
1909 return err;
1910}
1911
22e70050 1912static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1913 struct nlattr **attrs)
53bc6b4d 1914{
fc34acd3 1915 struct net *net = sock_net(skb->sk);
53bc6b4d
JHS		 1916 struct xfrm_state *x;
1917 int err;
7b67c857 1918 struct xfrm_user_expire *ue = nlmsg_data(nlh);
53bc6b4d 1919 struct xfrm_usersa_info *p = &ue->state;
6f26b61e 1920 struct xfrm_mark m;
928497f0 1921 u32 mark = xfrm_mark_get(attrs, &m);
53bc6b4d 1922
6f26b61e 1923 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
53bc6b4d 1924
3a765aa5 1925 err = -ENOENT;
53bc6b4d
JHS		 1926 if (x == NULL)
1927 return err;
1928
53bc6b4d 1929 spin_lock_bh(&x->lock);
3a765aa5 1930 err = -EINVAL;
53bc6b4d
JHS		 1931 if (x->km.state != XFRM_STATE_VALID)
1932 goto out;
1933 km_state_expired(x, ue->hard, current->pid);
1934
161a09e7 1935 if (ue->hard) {
c53fa1ed
PM		 1936 uid_t loginuid = audit_get_loginuid(current);
1937 u32 sessionid = audit_get_sessionid(current);
1938 u32 sid;
1939
1940 security_task_getsecid(current, &sid);
53bc6b4d 1941 __xfrm_state_delete(x);
2532386f 1942 xfrm_audit_state_delete(x, 1, loginuid, sessionid, sid);
161a09e7 1943 }
3a765aa5 1944 err = 0;
53bc6b4d
JHS		 1945out:
1946 spin_unlock_bh(&x->lock);
1947 xfrm_state_put(x);
1948 return err;
1949}
1950
22e70050 1951static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1952 struct nlattr **attrs)
980ebd25 1953{
fc34acd3 1954 struct net *net = sock_net(skb->sk);
980ebd25
JHS		 1955 struct xfrm_policy *xp;
1956 struct xfrm_user_tmpl *ut;
1957 int i;
5424f32e 1958 struct nlattr *rt = attrs[XFRMA_TMPL];
6f26b61e 1959 struct xfrm_mark mark;
980ebd25 1960
7b67c857 1961 struct xfrm_user_acquire *ua = nlmsg_data(nlh);
fc34acd3 1962 struct xfrm_state *x = xfrm_state_alloc(net);
980ebd25
JHS		 1963 int err = -ENOMEM;
1964
1965 if (!x)
d8eb9307 1966 goto nomem;
980ebd25 1967
6f26b61e
JHS		 1968 xfrm_mark_get(attrs, &mark);
1969
980ebd25 1970 err = verify_newpolicy_info(&ua->policy);
d8eb9307
IJ		 1971 if (err)
1972 goto bad_policy;
980ebd25
JHS		 1973
1974 /* build an XP */
fc34acd3 1975 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err);
d8eb9307
IJ		 1976 if (!xp)
1977 goto free_state;
980ebd25
JHS		 1978
1979 memcpy(&x->id, &ua->id, sizeof(ua->id));
1980 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
1981 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
6f26b61e
JHS		 1982 xp->mark.m = x->mark.m = mark.m;
1983 xp->mark.v = x->mark.v = mark.v;
5424f32e 1984 ut = nla_data(rt);
980ebd25
JHS		 1985 /* extract the templates and for each call km_key */
1986 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
1987 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1988 memcpy(&x->id, &t->id, sizeof(x->id));
1989 x->props.mode = t->mode;
1990 x->props.reqid = t->reqid;
1991 x->props.family = ut->family;
1992 t->aalgos = ua->aalgos;
1993 t->ealgos = ua->ealgos;
1994 t->calgos = ua->calgos;
1995 err = km_query(x, t, xp);
1996
1997 }
1998
1999 kfree(x);
2000 kfree(xp);
2001
2002 return 0;
d8eb9307
IJ		 2003
2004bad_policy:
62db5cfd 2005 WARN(1, "BAD policy passed\n");
d8eb9307
IJ		 2006free_state:
2007 kfree(x);
2008nomem:
2009 return err;
980ebd25
JHS		 2010}
2011
5c79de6e 2012#ifdef CONFIG_XFRM_MIGRATE
5c79de6e 2013static int copy_from_user_migrate(struct xfrm_migrate *ma,
13c1d189 2014 struct xfrm_kmaddress *k,
5424f32e 2015 struct nlattr **attrs, int *num)
5c79de6e 2016{
5424f32e 2017 struct nlattr *rt = attrs[XFRMA_MIGRATE];
5c79de6e
SS		 2018 struct xfrm_user_migrate *um;
2019 int i, num_migrate;
2020
13c1d189
AE		 2021 if (k != NULL) {
2022 struct xfrm_user_kmaddress *uk;
2023
2024 uk = nla_data(attrs[XFRMA_KMADDRESS]);
2025 memcpy(&k->local, &uk->local, sizeof(k->local));
2026 memcpy(&k->remote, &uk->remote, sizeof(k->remote));
2027 k->family = uk->family;
2028 k->reserved = uk->reserved;
2029 }
2030
5424f32e
TG		 2031 um = nla_data(rt);
2032 num_migrate = nla_len(rt) / sizeof(*um);
5c79de6e
SS		 2033
2034 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
2035 return -EINVAL;
2036
2037 for (i = 0; i < num_migrate; i++, um++, ma++) {
2038 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
2039 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
2040 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
2041 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
2042
2043 ma->proto = um->proto;
2044 ma->mode = um->mode;
2045 ma->reqid = um->reqid;
2046
2047 ma->old_family = um->old_family;
2048 ma->new_family = um->new_family;
2049 }
2050
2051 *num = i;
2052 return 0;
2053}
2054
2055static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 2056 struct nlattr **attrs)
5c79de6e 2057{
7b67c857 2058 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
5c79de6e 2059 struct xfrm_migrate m[XFRM_MAX_DEPTH];
13c1d189 2060 struct xfrm_kmaddress km, *kmp;
5c79de6e
SS		 2061 u8 type;
2062 int err;
2063 int n = 0;
2064
35a7aa08 2065 if (attrs[XFRMA_MIGRATE] == NULL)
cf5cb79f 2066 return -EINVAL;
5c79de6e 2067
13c1d189
AE		 2068 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
2069
5424f32e 2070 err = copy_from_user_policy_type(&type, attrs);
5c79de6e
SS		 2071 if (err)
2072 return err;
2073
13c1d189 2074 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
5c79de6e
SS		 2075 if (err)
2076 return err;
2077
2078 if (!n)
2079 return 0;
2080
13c1d189 2081 xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp);
5c79de6e
SS		 2082
2083 return 0;
2084}
2085#else
2086static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 2087 struct nlattr **attrs)
5c79de6e
SS		 2088{
2089 return -ENOPROTOOPT;
2090}
2091#endif
2092
2093#ifdef CONFIG_XFRM_MIGRATE
183cad12 2094static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
5c79de6e
SS		 2095{
2096 struct xfrm_user_migrate um;
2097
2098 memset(&um, 0, sizeof(um));
2099 um.proto = m->proto;
2100 um.mode = m->mode;
2101 um.reqid = m->reqid;
2102 um.old_family = m->old_family;
2103 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
2104 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
2105 um.new_family = m->new_family;
2106 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
2107 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
2108
c0144bea 2109 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
5c79de6e
SS		 2110}
2111
183cad12 2112static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
13c1d189
AE		 2113{
2114 struct xfrm_user_kmaddress uk;
2115
2116 memset(&uk, 0, sizeof(uk));
2117 uk.family = k->family;
2118 uk.reserved = k->reserved;
2119 memcpy(&uk.local, &k->local, sizeof(uk.local));
a1caa322 2120 memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
13c1d189
AE		 2121
2122 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
2123}
2124
2125static inline size_t xfrm_migrate_msgsize(int num_migrate, int with_kma)
7deb2264
TG		 2126{
2127 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
13c1d189
AE		 2128 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
2129 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
2130 + userpolicy_type_attrsize();
7deb2264
TG		 2131}
2132
183cad12
DM		 2133static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
2134 int num_migrate, const struct xfrm_kmaddress *k,
2135 const struct xfrm_selector *sel, u8 dir, u8 type)
5c79de6e 2136{
183cad12 2137 const struct xfrm_migrate *mp;
5c79de6e
SS		 2138 struct xfrm_userpolicy_id *pol_id;
2139 struct nlmsghdr *nlh;
5c79de6e
SS		 2140 int i;
2141
79b8b7f4
TG		 2142 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
2143 if (nlh == NULL)
2144 return -EMSGSIZE;
5c79de6e 2145
7b67c857 2146 pol_id = nlmsg_data(nlh);
5c79de6e
SS		 2147 /* copy data from selector, dir, and type to the pol_id */
2148 memset(pol_id, 0, sizeof(*pol_id));
2149 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
2150 pol_id->dir = dir;
2151
13c1d189
AE		 2152 if (k != NULL && (copy_to_user_kmaddress(k, skb) < 0))
2153 goto nlmsg_failure;
2154
5c79de6e
SS		 2155 if (copy_to_user_policy_type(type, skb) < 0)
2156 goto nlmsg_failure;
2157
2158 for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
2159 if (copy_to_user_migrate(mp, skb) < 0)
2160 goto nlmsg_failure;
2161 }
2162
9825069d 2163 return nlmsg_end(skb, nlh);
5c79de6e 2164nlmsg_failure:
9825069d
TG		 2165 nlmsg_cancel(skb, nlh);
2166 return -EMSGSIZE;
5c79de6e
SS		 2167}
2168
183cad12
DM		 2169static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2170 const struct xfrm_migrate *m, int num_migrate,
2171 const struct xfrm_kmaddress *k)
5c79de6e 2172{
a6483b79 2173 struct net *net = &init_net;
5c79de6e 2174 struct sk_buff *skb;
5c79de6e 2175
13c1d189 2176 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k), GFP_ATOMIC);
5c79de6e
SS		 2177 if (skb == NULL)
2178 return -ENOMEM;
2179
2180 /* build migrate */
13c1d189 2181 if (build_migrate(skb, m, num_migrate, k, sel, dir, type) < 0)
5c79de6e
SS		 2182 BUG();
2183
a6483b79 2184 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MIGRATE, GFP_ATOMIC);
5c79de6e
SS		 2185}
2186#else
183cad12
DM		 2187static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2188 const struct xfrm_migrate *m, int num_migrate,
2189 const struct xfrm_kmaddress *k)
5c79de6e
SS		 2190{
2191 return -ENOPROTOOPT;
2192}
2193#endif
d51d081d 2194
a7bd9a45 2195#define XMSGSIZE(type) sizeof(struct type)
492b558b
TG		 2196
2197static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
66f9a259 2198 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
492b558b
TG		 2199 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2200 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2201 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2202 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2203 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2204 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
980ebd25 2205 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
53bc6b4d 2206 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
492b558b 2207 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
66f9a259 2208 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
6c5c8ca7 2209 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
492b558b 2210 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
a7bd9a45 2211 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
d51d081d
JHS		 2212 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2213 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
97a64b45 2214 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
5c79de6e 2215 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
a7bd9a45
TG		 2216 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32),
2217 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
1da177e4
LT		 2218};
2219
492b558b
TG		 2220#undef XMSGSIZE
2221
cf5cb79f 2222static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
c28e9304 2223 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)},
2224 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)},
2225 [XFRMA_LASTUSED] = { .type = NLA_U64},
2226 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)},
1a6509d9 2227 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) },
cf5cb79f
TG		 2228 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) },
2229 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
2230 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) },
2231 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) },
2232 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) },
2233 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) },
2234 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
2235 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) },
2236 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 },
2237 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 },
2238 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) },
2239 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
2240 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
2241 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
13c1d189 2242 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) },
6f26b61e 2243 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) },
35d2856b 2244 [XFRMA_TFCPAD] = { .type = NLA_U32 },
d8647b79 2245 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) },
cf5cb79f
TG		 2246};
2247
1da177e4 2248static struct xfrm_link {
5424f32e 2249 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
1da177e4 2250 int (*dump)(struct sk_buff *, struct netlink_callback *);
4c563f76 2251 int (*done)(struct netlink_callback *);
492b558b
TG		 2252} xfrm_dispatch[XFRM_NR_MSGTYPES] = {
2253 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2254 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
2255 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
4c563f76
TT		 2256 .dump = xfrm_dump_sa,
2257 .done = xfrm_dump_sa_done },
492b558b
TG		 2258 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2259 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
2260 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
4c563f76
TT		 2261 .dump = xfrm_dump_policy,
2262 .done = xfrm_dump_policy_done },
492b558b 2263 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
980ebd25 2264 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
53bc6b4d 2265 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
492b558b
TG		 2266 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2267 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
6c5c8ca7 2268 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
492b558b
TG		 2269 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
2270 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
d51d081d
JHS		 2271 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
2272 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
5c79de6e 2273 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
566ec034 2274 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo },
ecfd6b18 2275 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo },
1da177e4
LT		 2276};
2277
1d00a4eb 2278static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 2279{
a6483b79 2280 struct net *net = sock_net(skb->sk);
35a7aa08 2281 struct nlattr *attrs[XFRMA_MAX+1];
1da177e4 2282 struct xfrm_link *link;
a7bd9a45 2283 int type, err;
1da177e4 2284
1da177e4 2285 type = nlh->nlmsg_type;
1da177e4 2286 if (type > XFRM_MSG_MAX)
1d00a4eb 2287 return -EINVAL;
1da177e4
LT		 2288
2289 type -= XFRM_MSG_BASE;
2290 link = &xfrm_dispatch[type];
2291
2292 /* All operations require privileges, even GET */
fd778461 2293 if (!capable(CAP_NET_ADMIN))
1d00a4eb 2294 return -EPERM;
1da177e4 2295
492b558b
TG		 2296 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
2297 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
b8f3ab42 2298 (nlh->nlmsg_flags & NLM_F_DUMP)) {
1da177e4 2299 if (link->dump == NULL)
1d00a4eb 2300 return -EINVAL;
88fc2c84 2301
80d326fa
PNA		 2302 {
2303 struct netlink_dump_control c = {
2304 .dump = link->dump,
2305 .done = link->done,
2306 };
2307 return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
2308 }
1da177e4
LT		 2309 }
2310
35a7aa08 2311 err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs, XFRMA_MAX,
cf5cb79f 2312 xfrma_policy);
a7bd9a45
TG		 2313 if (err < 0)
2314 return err;
1da177e4
LT		 2315
2316 if (link->doit == NULL)
1d00a4eb 2317 return -EINVAL;
1da177e4 2318
5424f32e 2319 return link->doit(skb, nlh, attrs);
1da177e4
LT		 2320}
2321
cd40b7d3 2322static void xfrm_netlink_rcv(struct sk_buff *skb)
1da177e4 2323{
cd40b7d3
DL		 2324 mutex_lock(&xfrm_cfg_mutex);
2325 netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
2326 mutex_unlock(&xfrm_cfg_mutex);
1da177e4
LT		 2327}
2328
7deb2264
TG		 2329static inline size_t xfrm_expire_msgsize(void)
2330{
6f26b61e
JHS		 2331 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire))
2332 + nla_total_size(sizeof(struct xfrm_mark));
7deb2264
TG		 2333}
2334
214e005b 2335static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
1da177e4
LT		 2336{
2337 struct xfrm_user_expire *ue;
2338 struct nlmsghdr *nlh;
1da177e4 2339
79b8b7f4
TG		 2340 nlh = nlmsg_put(skb, c->pid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
2341 if (nlh == NULL)
2342 return -EMSGSIZE;
1da177e4 2343
7b67c857 2344 ue = nlmsg_data(nlh);
1da177e4 2345 copy_to_user_state(x, &ue->state);
d51d081d 2346 ue->hard = (c->data.hard != 0) ? 1 : 0;
1da177e4 2347
6f26b61e
JHS		 2348 if (xfrm_mark_put(skb, &x->mark))
2349 goto nla_put_failure;
2350
9825069d 2351 return nlmsg_end(skb, nlh);
6f26b61e
JHS		 2352
2353nla_put_failure:
2354 return -EMSGSIZE;
1da177e4
LT		 2355}
2356
214e005b 2357static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
1da177e4 2358{
fc34acd3 2359 struct net *net = xs_net(x);
1da177e4
LT		 2360 struct sk_buff *skb;
2361
7deb2264 2362 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
1da177e4
LT		 2363 if (skb == NULL)
2364 return -ENOMEM;
2365
6f26b61e
JHS		 2366 if (build_expire(skb, x, c) < 0) {
2367 kfree_skb(skb);
2368 return -EMSGSIZE;
2369 }
1da177e4 2370
a6483b79 2371 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
1da177e4
LT		 2372}
2373
214e005b 2374static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
d51d081d 2375{
fc34acd3 2376 struct net *net = xs_net(x);
d51d081d 2377 struct sk_buff *skb;
d51d081d 2378
d8647b79 2379 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
d51d081d
JHS		 2380 if (skb == NULL)
2381 return -ENOMEM;
2382
2383 if (build_aevent(skb, x, c) < 0)
2384 BUG();
2385
a6483b79 2386 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_AEVENTS, GFP_ATOMIC);
d51d081d
JHS		 2387}
2388
214e005b 2389static int xfrm_notify_sa_flush(const struct km_event *c)
26b15dad 2390{
7067802e 2391 struct net *net = c->net;
26b15dad
JHS		 2392 struct xfrm_usersa_flush *p;
2393 struct nlmsghdr *nlh;
2394 struct sk_buff *skb;
7deb2264 2395 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
26b15dad 2396
7deb2264 2397 skb = nlmsg_new(len, GFP_ATOMIC);
26b15dad
JHS		 2398 if (skb == NULL)
2399 return -ENOMEM;
26b15dad 2400
79b8b7f4
TG		 2401 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
2402 if (nlh == NULL) {
2403 kfree_skb(skb);
2404 return -EMSGSIZE;
2405 }
26b15dad 2406
7b67c857 2407 p = nlmsg_data(nlh);
bf08867f 2408 p->proto = c->data.proto;
26b15dad 2409
9825069d 2410 nlmsg_end(skb, nlh);
26b15dad 2411
a6483b79 2412 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
26b15dad
JHS		 2413}
2414
7deb2264 2415static inline size_t xfrm_sa_len(struct xfrm_state *x)
26b15dad 2416{
7deb2264 2417 size_t l = 0;
1a6509d9
HX		 2418 if (x->aead)
2419 l += nla_total_size(aead_len(x->aead));
4447bb33
MW		 2420 if (x->aalg) {
2421 l += nla_total_size(sizeof(struct xfrm_algo) +
2422 (x->aalg->alg_key_len + 7) / 8);
2423 l += nla_total_size(xfrm_alg_auth_len(x->aalg));
2424 }
26b15dad 2425 if (x->ealg)
0f99be0d 2426 l += nla_total_size(xfrm_alg_len(x->ealg));
26b15dad 2427 if (x->calg)
7deb2264 2428 l += nla_total_size(sizeof(*x->calg));
26b15dad 2429 if (x->encap)
7deb2264 2430 l += nla_total_size(sizeof(*x->encap));
35d2856b
MW		 2431 if (x->tfcpad)
2432 l += nla_total_size(sizeof(x->tfcpad));
d8647b79
SK		 2433 if (x->replay_esn)
2434 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
68325d3b
HX		 2435 if (x->security)
2436 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2437 x->security->ctx_len);
2438 if (x->coaddr)
2439 l += nla_total_size(sizeof(*x->coaddr));
2440
d26f3984
HX		 2441 /* Must count x->lastused as it may become non-zero behind our back. */
2442 l += nla_total_size(sizeof(u64));
26b15dad
JHS		 2443
2444 return l;
2445}
2446
214e005b 2447static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
26b15dad 2448{
fc34acd3 2449 struct net *net = xs_net(x);
26b15dad 2450 struct xfrm_usersa_info *p;
0603eac0 2451 struct xfrm_usersa_id *id;
26b15dad
JHS		 2452 struct nlmsghdr *nlh;
2453 struct sk_buff *skb;
26b15dad 2454 int len = xfrm_sa_len(x);
0603eac0
HX		 2455 int headlen;
2456
2457 headlen = sizeof(*p);
2458 if (c->event == XFRM_MSG_DELSA) {
7deb2264 2459 len += nla_total_size(headlen);
0603eac0 2460 headlen = sizeof(*id);
6f26b61e 2461 len += nla_total_size(sizeof(struct xfrm_mark));
0603eac0 2462 }
7deb2264 2463 len += NLMSG_ALIGN(headlen);
26b15dad 2464
7deb2264 2465 skb = nlmsg_new(len, GFP_ATOMIC);
26b15dad
JHS		 2466 if (skb == NULL)
2467 return -ENOMEM;
26b15dad 2468
79b8b7f4
TG		 2469 nlh = nlmsg_put(skb, c->pid, c->seq, c->event, headlen, 0);
2470 if (nlh == NULL)
c0144bea 2471 goto nla_put_failure;
26b15dad 2472
7b67c857 2473 p = nlmsg_data(nlh);
0603eac0 2474 if (c->event == XFRM_MSG_DELSA) {
c0144bea
TG		 2475 struct nlattr *attr;
2476
7b67c857 2477 id = nlmsg_data(nlh);
0603eac0
HX		 2478 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2479 id->spi = x->id.spi;
2480 id->family = x->props.family;
2481 id->proto = x->id.proto;
2482
c0144bea
TG		 2483 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
2484 if (attr == NULL)
2485 goto nla_put_failure;
2486
2487 p = nla_data(attr);
0603eac0
HX		 2488 }
2489
68325d3b
HX		 2490 if (copy_to_user_state_extra(x, p, skb))
2491 goto nla_put_failure;
26b15dad 2492
9825069d 2493 nlmsg_end(skb, nlh);
26b15dad 2494
a6483b79 2495 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
26b15dad 2496
c0144bea 2497nla_put_failure:
68325d3b
HX		 2498 /* Somebody screwed up with xfrm_sa_len! */
2499 WARN_ON(1);
26b15dad
JHS		 2500 kfree_skb(skb);
2501 return -1;
2502}
2503
214e005b 2504static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
26b15dad
JHS		 2505{
2506
2507 switch (c->event) {
f60f6b8f 2508 case XFRM_MSG_EXPIRE:
26b15dad 2509 return xfrm_exp_state_notify(x, c);
d51d081d
JHS		 2510 case XFRM_MSG_NEWAE:
2511 return xfrm_aevent_state_notify(x, c);
f60f6b8f
HX		 2512 case XFRM_MSG_DELSA:
2513 case XFRM_MSG_UPDSA:
2514 case XFRM_MSG_NEWSA:
26b15dad 2515 return xfrm_notify_sa(x, c);
f60f6b8f 2516 case XFRM_MSG_FLUSHSA:
26b15dad
JHS		 2517 return xfrm_notify_sa_flush(c);
2518 default:
62db5cfd 2519 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
2520 c->event);
2521 break;
26b15dad
JHS		 2522 }
2523
2524 return 0;
2525
2526}
2527
7deb2264
TG		 2528static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x,
2529 struct xfrm_policy *xp)
2530{
2531 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
2532 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
6f26b61e 2533 + nla_total_size(sizeof(struct xfrm_mark))
7deb2264
TG		 2534 + nla_total_size(xfrm_user_sec_ctx_size(x->security))
2535 + userpolicy_type_attrsize();
2536}
2537
1da177e4
LT		 2538static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
2539 struct xfrm_tmpl *xt, struct xfrm_policy *xp,
2540 int dir)
2541{
2542 struct xfrm_user_acquire *ua;
2543 struct nlmsghdr *nlh;
1da177e4
LT		 2544 __u32 seq = xfrm_get_acqseq();
2545
79b8b7f4
TG		 2546 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
2547 if (nlh == NULL)
2548 return -EMSGSIZE;
1da177e4 2549
7b67c857 2550 ua = nlmsg_data(nlh);
1da177e4
LT		 2551 memcpy(&ua->id, &x->id, sizeof(ua->id));
2552 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2553 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
2554 copy_to_user_policy(xp, &ua->policy, dir);
2555 ua->aalgos = xt->aalgos;
2556 ua->ealgos = xt->ealgos;
2557 ua->calgos = xt->calgos;
2558 ua->seq = x->km.seq = seq;
2559
2560 if (copy_to_user_tmpl(xp, skb) < 0)
2561 goto nlmsg_failure;
0d681623 2562 if (copy_to_user_state_sec_ctx(x, skb))
df71837d 2563 goto nlmsg_failure;
1459bb36 2564 if (copy_to_user_policy_type(xp->type, skb) < 0)
f7b6983f 2565 goto nlmsg_failure;
295fae56
JHS		 2566 if (xfrm_mark_put(skb, &xp->mark))
2567 goto nla_put_failure;
1da177e4 2568
9825069d 2569 return nlmsg_end(skb, nlh);
1da177e4 2570
295fae56 2571nla_put_failure:
1da177e4 2572nlmsg_failure:
9825069d
TG		 2573 nlmsg_cancel(skb, nlh);
2574 return -EMSGSIZE;
1da177e4
LT		 2575}
2576
2577static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
2578 struct xfrm_policy *xp, int dir)
2579{
a6483b79 2580 struct net *net = xs_net(x);
1da177e4 2581 struct sk_buff *skb;
1da177e4 2582
7deb2264 2583 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
1da177e4
LT		 2584 if (skb == NULL)
2585 return -ENOMEM;
2586
2587 if (build_acquire(skb, x, xt, xp, dir) < 0)
2588 BUG();
2589
a6483b79 2590 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_ACQUIRE, GFP_ATOMIC);
1da177e4
LT		 2591}
2592
2593/* User gives us xfrm_user_policy_info followed by an array of 0
2594 * or more templates.
2595 */
cb969f07 2596static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
1da177e4
LT		 2597 u8 *data, int len, int *dir)
2598{
fc34acd3 2599 struct net *net = sock_net(sk);
1da177e4
LT		 2600 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2601 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2602 struct xfrm_policy *xp;
2603 int nr;
2604
cb969f07 2605 switch (sk->sk_family) {
1da177e4
LT		 2606 case AF_INET:
2607 if (opt != IP_XFRM_POLICY) {
2608 *dir = -EOPNOTSUPP;
2609 return NULL;
2610 }
2611 break;
dfd56b8b 2612#if IS_ENABLED(CONFIG_IPV6)
1da177e4
LT		 2613 case AF_INET6:
2614 if (opt != IPV6_XFRM_POLICY) {
2615 *dir = -EOPNOTSUPP;
2616 return NULL;
2617 }
2618 break;
2619#endif
2620 default:
2621 *dir = -EINVAL;
2622 return NULL;
2623 }
2624
2625 *dir = -EINVAL;
2626
2627 if (len < sizeof(*p) ||
2628 verify_newpolicy_info(p))
2629 return NULL;
2630
2631 nr = ((len - sizeof(*p)) / sizeof(*ut));
b4ad86bf 2632 if (validate_tmpl(nr, ut, p->sel.family))
1da177e4
LT		 2633 return NULL;
2634
a4f1bac6
HX		 2635 if (p->dir > XFRM_POLICY_OUT)
2636 return NULL;
2637
2f09a4d5 2638 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
1da177e4
LT		 2639 if (xp == NULL) {
2640 *dir = -ENOBUFS;
2641 return NULL;
2642 }
2643
2644 copy_from_user_policy(xp, p);
f7b6983f 2645 xp->type = XFRM_POLICY_TYPE_MAIN;
1da177e4
LT		 2646 copy_templates(xp, ut, nr);
2647
2648 *dir = p->dir;
2649
2650 return xp;
2651}
2652
7deb2264
TG		 2653static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp)
2654{
2655 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
2656 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2657 + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
295fae56 2658 + nla_total_size(sizeof(struct xfrm_mark))
7deb2264
TG		 2659 + userpolicy_type_attrsize();
2660}
2661
1da177e4 2662static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
214e005b 2663 int dir, const struct km_event *c)
1da177e4
LT		 2664{
2665 struct xfrm_user_polexpire *upe;
2666 struct nlmsghdr *nlh;
d51d081d 2667 int hard = c->data.hard;
1da177e4 2668
79b8b7f4
TG		 2669 nlh = nlmsg_put(skb, c->pid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
2670 if (nlh == NULL)
2671 return -EMSGSIZE;
1da177e4 2672
7b67c857 2673 upe = nlmsg_data(nlh);
1da177e4
LT		 2674 copy_to_user_policy(xp, &upe->pol, dir);
2675 if (copy_to_user_tmpl(xp, skb) < 0)
2676 goto nlmsg_failure;
df71837d
TJ		 2677 if (copy_to_user_sec_ctx(xp, skb))
2678 goto nlmsg_failure;
1459bb36 2679 if (copy_to_user_policy_type(xp->type, skb) < 0)
f7b6983f 2680 goto nlmsg_failure;
295fae56
JHS		 2681 if (xfrm_mark_put(skb, &xp->mark))
2682 goto nla_put_failure;
1da177e4
LT		 2683 upe->hard = !!hard;
2684
9825069d 2685 return nlmsg_end(skb, nlh);
1da177e4 2686
295fae56 2687nla_put_failure:
1da177e4 2688nlmsg_failure:
9825069d
TG		 2689 nlmsg_cancel(skb, nlh);
2690 return -EMSGSIZE;
1da177e4
LT		 2691}
2692
214e005b 2693static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
1da177e4 2694{
fc34acd3 2695 struct net *net = xp_net(xp);
1da177e4 2696 struct sk_buff *skb;
1da177e4 2697
7deb2264 2698 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
1da177e4
LT		 2699 if (skb == NULL)
2700 return -ENOMEM;
2701
d51d081d 2702 if (build_polexpire(skb, xp, dir, c) < 0)
1da177e4
LT		 2703 BUG();
2704
a6483b79 2705 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
1da177e4
LT		 2706}
2707
214e005b 2708static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
26b15dad 2709{
fc34acd3 2710 struct net *net = xp_net(xp);
26b15dad 2711 struct xfrm_userpolicy_info *p;
0603eac0 2712 struct xfrm_userpolicy_id *id;
26b15dad
JHS		 2713 struct nlmsghdr *nlh;
2714 struct sk_buff *skb;
7deb2264 2715 int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
0603eac0
HX		 2716 int headlen;
2717
2718 headlen = sizeof(*p);
2719 if (c->event == XFRM_MSG_DELPOLICY) {
7deb2264 2720 len += nla_total_size(headlen);
0603eac0
HX		 2721 headlen = sizeof(*id);
2722 }
cfbfd45a 2723 len += userpolicy_type_attrsize();
295fae56 2724 len += nla_total_size(sizeof(struct xfrm_mark));
7deb2264 2725 len += NLMSG_ALIGN(headlen);
26b15dad 2726
7deb2264 2727 skb = nlmsg_new(len, GFP_ATOMIC);
26b15dad
JHS		 2728 if (skb == NULL)
2729 return -ENOMEM;
26b15dad 2730
79b8b7f4
TG		 2731 nlh = nlmsg_put(skb, c->pid, c->seq, c->event, headlen, 0);
2732 if (nlh == NULL)
2733 goto nlmsg_failure;
26b15dad 2734
7b67c857 2735 p = nlmsg_data(nlh);
0603eac0 2736 if (c->event == XFRM_MSG_DELPOLICY) {
c0144bea
TG		 2737 struct nlattr *attr;
2738
7b67c857 2739 id = nlmsg_data(nlh);
0603eac0
HX		 2740 memset(id, 0, sizeof(*id));
2741 id->dir = dir;
2742 if (c->data.byid)
2743 id->index = xp->index;
2744 else
2745 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
2746
c0144bea
TG		 2747 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
2748 if (attr == NULL)
2749 goto nlmsg_failure;
2750
2751 p = nla_data(attr);
0603eac0 2752 }
26b15dad 2753
26b15dad
JHS		 2754 copy_to_user_policy(xp, p, dir);
2755 if (copy_to_user_tmpl(xp, skb) < 0)
2756 goto nlmsg_failure;
1459bb36 2757 if (copy_to_user_policy_type(xp->type, skb) < 0)
f7b6983f 2758 goto nlmsg_failure;
26b15dad 2759
295fae56
JHS		 2760 if (xfrm_mark_put(skb, &xp->mark))
2761 goto nla_put_failure;
2762
9825069d 2763 nlmsg_end(skb, nlh);
26b15dad 2764
a6483b79 2765 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
26b15dad 2766
295fae56 2767nla_put_failure:
26b15dad
JHS		 2768nlmsg_failure:
2769 kfree_skb(skb);
2770 return -1;
2771}
2772
214e005b 2773static int xfrm_notify_policy_flush(const struct km_event *c)
26b15dad 2774{
7067802e 2775 struct net *net = c->net;
26b15dad
JHS		 2776 struct nlmsghdr *nlh;
2777 struct sk_buff *skb;
26b15dad 2778
7deb2264 2779 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
26b15dad
JHS		 2780 if (skb == NULL)
2781 return -ENOMEM;
26b15dad 2782
79b8b7f4
TG		 2783 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
2784 if (nlh == NULL)
2785 goto nlmsg_failure;
0c51f53c
JHS		 2786 if (copy_to_user_policy_type(c->data.type, skb) < 0)
2787 goto nlmsg_failure;
26b15dad 2788
9825069d 2789 nlmsg_end(skb, nlh);
26b15dad 2790
a6483b79 2791 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
26b15dad
JHS		 2792
2793nlmsg_failure:
2794 kfree_skb(skb);
2795 return -1;
2796}
2797
214e005b 2798static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
26b15dad
JHS		 2799{
2800
2801 switch (c->event) {
f60f6b8f
HX		 2802 case XFRM_MSG_NEWPOLICY:
2803 case XFRM_MSG_UPDPOLICY:
2804 case XFRM_MSG_DELPOLICY:
26b15dad 2805 return xfrm_notify_policy(xp, dir, c);
f60f6b8f 2806 case XFRM_MSG_FLUSHPOLICY:
26b15dad 2807 return xfrm_notify_policy_flush(c);
f60f6b8f 2808 case XFRM_MSG_POLEXPIRE:
26b15dad
JHS		 2809 return xfrm_exp_policy_notify(xp, dir, c);
2810 default:
62db5cfd 2811 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
2812 c->event);
26b15dad
JHS		 2813 }
2814
2815 return 0;
2816
2817}
2818
7deb2264
TG		 2819static inline size_t xfrm_report_msgsize(void)
2820{
2821 return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
2822}
2823
97a64b45
MN		 2824static int build_report(struct sk_buff *skb, u8 proto,
2825 struct xfrm_selector *sel, xfrm_address_t *addr)
2826{
2827 struct xfrm_user_report *ur;
2828 struct nlmsghdr *nlh;
97a64b45 2829
79b8b7f4
TG		 2830 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
2831 if (nlh == NULL)
2832 return -EMSGSIZE;
97a64b45 2833
7b67c857 2834 ur = nlmsg_data(nlh);
97a64b45
MN		 2835 ur->proto = proto;
2836 memcpy(&ur->sel, sel, sizeof(ur->sel));
2837
2838 if (addr)
c0144bea 2839 NLA_PUT(skb, XFRMA_COADDR, sizeof(*addr), addr);
97a64b45 2840
9825069d 2841 return nlmsg_end(skb, nlh);
97a64b45 2842
c0144bea 2843nla_put_failure:
9825069d
TG		 2844 nlmsg_cancel(skb, nlh);
2845 return -EMSGSIZE;
97a64b45
MN		 2846}
2847
db983c11
AD		 2848static int xfrm_send_report(struct net *net, u8 proto,
2849 struct xfrm_selector *sel, xfrm_address_t *addr)
97a64b45
MN		 2850{
2851 struct sk_buff *skb;
97a64b45 2852
7deb2264 2853 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
97a64b45
MN		 2854 if (skb == NULL)
2855 return -ENOMEM;
2856
2857 if (build_report(skb, proto, sel, addr) < 0)
2858 BUG();
2859
a6483b79 2860 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_REPORT, GFP_ATOMIC);
97a64b45
MN		 2861}
2862
3a2dfbe8
MW		 2863static inline size_t xfrm_mapping_msgsize(void)
2864{
2865 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
2866}
2867
2868static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
2869 xfrm_address_t *new_saddr, __be16 new_sport)
2870{
2871 struct xfrm_user_mapping *um;
2872 struct nlmsghdr *nlh;
2873
2874 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
2875 if (nlh == NULL)
2876 return -EMSGSIZE;
2877
2878 um = nlmsg_data(nlh);
2879
2880 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
2881 um->id.spi = x->id.spi;
2882 um->id.family = x->props.family;
2883 um->id.proto = x->id.proto;
2884 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
2885 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
2886 um->new_sport = new_sport;
2887 um->old_sport = x->encap->encap_sport;
2888 um->reqid = x->props.reqid;
2889
2890 return nlmsg_end(skb, nlh);
2891}
2892
2893static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
2894 __be16 sport)
2895{
a6483b79 2896 struct net *net = xs_net(x);
3a2dfbe8
MW		 2897 struct sk_buff *skb;
2898
2899 if (x->id.proto != IPPROTO_ESP)
2900 return -EINVAL;
2901
2902 if (!x->encap)
2903 return -EINVAL;
2904
2905 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
2906 if (skb == NULL)
2907 return -ENOMEM;
2908
2909 if (build_mapping(skb, x, ipaddr, sport) < 0)
2910 BUG();
2911
a6483b79 2912 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MAPPING, GFP_ATOMIC);
3a2dfbe8
MW		 2913}
2914
1da177e4
LT		 2915static struct xfrm_mgr netlink_mgr = {
2916 .id = "netlink",
2917 .notify = xfrm_send_state_notify,
2918 .acquire = xfrm_send_acquire,
2919 .compile_policy = xfrm_compile_policy,
2920 .notify_policy = xfrm_send_policy_notify,
97a64b45 2921 .report = xfrm_send_report,
5c79de6e 2922 .migrate = xfrm_send_migrate,
3a2dfbe8 2923 .new_mapping = xfrm_send_mapping,
1da177e4
LT		 2924};
2925
a6483b79 2926static int __net_init xfrm_user_net_init(struct net *net)
1da177e4 2927{
be33690d
PM		 2928 struct sock *nlsk;
2929
a6483b79 2930 nlsk = netlink_kernel_create(net, NETLINK_XFRM, XFRMNLGRP_MAX,
af65bdfc 2931 xfrm_netlink_rcv, NULL, THIS_MODULE);
be33690d 2932 if (nlsk == NULL)
1da177e4 2933 return -ENOMEM;
d79d792e 2934 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
cf778b00 2935 rcu_assign_pointer(net->xfrm.nlsk, nlsk);
1da177e4
LT		 2936 return 0;
2937}
2938
d79d792e 2939static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
1da177e4 2940{
d79d792e
EB		 2941 struct net *net;
2942 list_for_each_entry(net, net_exit_list, exit_list)
a9b3cd7f 2943 RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
d79d792e
EB		 2944 synchronize_net();
2945 list_for_each_entry(net, net_exit_list, exit_list)
2946 netlink_kernel_release(net->xfrm.nlsk_stash);
1da177e4
LT		 2947}
2948
a6483b79 2949static struct pernet_operations xfrm_user_net_ops = {
d79d792e
EB		 2950 .init = xfrm_user_net_init,
2951 .exit_batch = xfrm_user_net_exit,
a6483b79
AD		 2952};
2953
2954static int __init xfrm_user_init(void)
2955{
2956 int rv;
2957
2958 printk(KERN_INFO "Initializing XFRM netlink socket\n");
2959
2960 rv = register_pernet_subsys(&xfrm_user_net_ops);
2961 if (rv < 0)
2962 return rv;
2963 rv = xfrm_register_km(&netlink_mgr);
2964 if (rv < 0)
2965 unregister_pernet_subsys(&xfrm_user_net_ops);
2966 return rv;
2967}
2968
2969static void __exit xfrm_user_exit(void)
2970{
2971 xfrm_unregister_km(&netlink_mgr);
2972 unregister_pernet_subsys(&xfrm_user_net_ops);
2973}
2974
1da177e4
LT		 2975module_init(xfrm_user_init);
2976module_exit(xfrm_user_exit);
2977MODULE_LICENSE("GPL");
4fdb3bb7 2978MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
f8cd5488 2979
Linux 6.x block layer and io_uring tree(s)