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netns xfrm: xfrm_input() fixup
[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>
1da177e4 29#include <asm/uaccess.h>
e23c7194
MN		 30#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
31#include <linux/in6.h>
32#endif
1da177e4 33
1a6509d9
HX		 34static inline int aead_len(struct xfrm_algo_aead *alg)
35{
36 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
37}
38
5424f32e 39static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type)
1da177e4 40{
5424f32e 41 struct nlattr *rt = attrs[type];
1da177e4
LT		 42 struct xfrm_algo *algp;
43
44 if (!rt)
45 return 0;
46
5424f32e 47 algp = nla_data(rt);
0f99be0d 48 if (nla_len(rt) < xfrm_alg_len(algp))
31c26852
HX		 49 return -EINVAL;
50
1da177e4
LT		 51 switch (type) {
52 case XFRMA_ALG_AUTH:
1da177e4 53 case XFRMA_ALG_CRYPT:
1da177e4 54 case XFRMA_ALG_COMP:
1da177e4
LT		 55 break;
56
57 default:
58 return -EINVAL;
3ff50b79 59 }
1da177e4
LT		 60
61 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
62 return 0;
63}
64
1a6509d9
HX		 65static int verify_aead(struct nlattr **attrs)
66{
67 struct nlattr *rt = attrs[XFRMA_ALG_AEAD];
68 struct xfrm_algo_aead *algp;
69
70 if (!rt)
71 return 0;
72
73 algp = nla_data(rt);
74 if (nla_len(rt) < aead_len(algp))
75 return -EINVAL;
76
77 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
78 return 0;
79}
80
5424f32e 81static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type,
eb2971b6
MN		 82 xfrm_address_t **addrp)
83{
5424f32e 84 struct nlattr *rt = attrs[type];
eb2971b6 85
cf5cb79f 86 if (rt && addrp)
5424f32e 87 *addrp = nla_data(rt);
eb2971b6 88}
df71837d 89
5424f32e 90static inline int verify_sec_ctx_len(struct nlattr **attrs)
df71837d 91{
5424f32e 92 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
df71837d 93 struct xfrm_user_sec_ctx *uctx;
df71837d
TJ		 94
95 if (!rt)
96 return 0;
97
5424f32e 98 uctx = nla_data(rt);
cf5cb79f 99 if (uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len))
df71837d
TJ		 100 return -EINVAL;
101
102 return 0;
103}
104
105
1da177e4 106static int verify_newsa_info(struct xfrm_usersa_info *p,
5424f32e 107 struct nlattr **attrs)
1da177e4
LT		 108{
109 int err;
110
111 err = -EINVAL;
112 switch (p->family) {
113 case AF_INET:
114 break;
115
116 case AF_INET6:
117#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
118 break;
119#else
120 err = -EAFNOSUPPORT;
121 goto out;
122#endif
123
124 default:
125 goto out;
3ff50b79 126 }
1da177e4
LT		 127
128 err = -EINVAL;
129 switch (p->id.proto) {
130 case IPPROTO_AH:
35a7aa08 131 if (!attrs[XFRMA_ALG_AUTH] ||
1a6509d9 132 attrs[XFRMA_ALG_AEAD] ||
35a7aa08
TG		 133 attrs[XFRMA_ALG_CRYPT] ||
134 attrs[XFRMA_ALG_COMP])
1da177e4
LT		 135 goto out;
136 break;
137
138 case IPPROTO_ESP:
1a6509d9
HX		 139 if (attrs[XFRMA_ALG_COMP])
140 goto out;
141 if (!attrs[XFRMA_ALG_AUTH] &&
142 !attrs[XFRMA_ALG_CRYPT] &&
143 !attrs[XFRMA_ALG_AEAD])
144 goto out;
145 if ((attrs[XFRMA_ALG_AUTH] ||
146 attrs[XFRMA_ALG_CRYPT]) &&
147 attrs[XFRMA_ALG_AEAD])
1da177e4
LT		 148 goto out;
149 break;
150
151 case IPPROTO_COMP:
35a7aa08 152 if (!attrs[XFRMA_ALG_COMP] ||
1a6509d9 153 attrs[XFRMA_ALG_AEAD] ||
35a7aa08
TG		 154 attrs[XFRMA_ALG_AUTH] ||
155 attrs[XFRMA_ALG_CRYPT])
1da177e4
LT		 156 goto out;
157 break;
158
e23c7194
MN		 159#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
160 case IPPROTO_DSTOPTS:
161 case IPPROTO_ROUTING:
35a7aa08
TG		 162 if (attrs[XFRMA_ALG_COMP] ||
163 attrs[XFRMA_ALG_AUTH] ||
1a6509d9 164 attrs[XFRMA_ALG_AEAD] ||
35a7aa08
TG		 165 attrs[XFRMA_ALG_CRYPT] ||
166 attrs[XFRMA_ENCAP] ||
167 attrs[XFRMA_SEC_CTX] ||
168 !attrs[XFRMA_COADDR])
e23c7194
MN		 169 goto out;
170 break;
171#endif
172
1da177e4
LT		 173 default:
174 goto out;
3ff50b79 175 }
1da177e4 176
1a6509d9
HX		 177 if ((err = verify_aead(attrs)))
178 goto out;
35a7aa08 179 if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH)))
1da177e4 180 goto out;
35a7aa08 181 if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT)))
1da177e4 182 goto out;
35a7aa08 183 if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP)))
1da177e4 184 goto out;
35a7aa08 185 if ((err = verify_sec_ctx_len(attrs)))
df71837d 186 goto out;
1da177e4
LT		 187
188 err = -EINVAL;
189 switch (p->mode) {
7e49e6de
MN		 190 case XFRM_MODE_TRANSPORT:
191 case XFRM_MODE_TUNNEL:
060f02a3 192 case XFRM_MODE_ROUTEOPTIMIZATION:
0a69452c 193 case XFRM_MODE_BEET:
1da177e4
LT		 194 break;
195
196 default:
197 goto out;
3ff50b79 198 }
1da177e4
LT		 199
200 err = 0;
201
202out:
203 return err;
204}
205
206static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
207 struct xfrm_algo_desc *(*get_byname)(char *, int),
5424f32e 208 struct nlattr *rta)
1da177e4 209{
1da177e4
LT		 210 struct xfrm_algo *p, *ualg;
211 struct xfrm_algo_desc *algo;
212
213 if (!rta)
214 return 0;
215
5424f32e 216 ualg = nla_data(rta);
1da177e4
LT		 217
218 algo = get_byname(ualg->alg_name, 1);
219 if (!algo)
220 return -ENOSYS;
221 *props = algo->desc.sadb_alg_id;
222
0f99be0d 223 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
1da177e4
LT		 224 if (!p)
225 return -ENOMEM;
226
04ff1260 227 strcpy(p->alg_name, algo->name);
1da177e4
LT		 228 *algpp = p;
229 return 0;
230}
231
1a6509d9
HX		 232static int attach_aead(struct xfrm_algo_aead **algpp, u8 *props,
233 struct nlattr *rta)
234{
235 struct xfrm_algo_aead *p, *ualg;
236 struct xfrm_algo_desc *algo;
237
238 if (!rta)
239 return 0;
240
241 ualg = nla_data(rta);
242
243 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
244 if (!algo)
245 return -ENOSYS;
246 *props = algo->desc.sadb_alg_id;
247
248 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
249 if (!p)
250 return -ENOMEM;
251
252 strcpy(p->alg_name, algo->name);
253 *algpp = p;
254 return 0;
255}
256
661697f7 257static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
df71837d 258{
df71837d
TJ		 259 int len = 0;
260
261 if (xfrm_ctx) {
262 len += sizeof(struct xfrm_user_sec_ctx);
263 len += xfrm_ctx->ctx_len;
264 }
265 return len;
266}
267
1da177e4
LT		 268static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
269{
270 memcpy(&x->id, &p->id, sizeof(x->id));
271 memcpy(&x->sel, &p->sel, sizeof(x->sel));
272 memcpy(&x->lft, &p->lft, sizeof(x->lft));
273 x->props.mode = p->mode;
274 x->props.replay_window = p->replay_window;
275 x->props.reqid = p->reqid;
276 x->props.family = p->family;
54489c14 277 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
1da177e4 278 x->props.flags = p->flags;
196b0036 279
ccf9b3b8 280 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
196b0036 281 x->sel.family = p->family;
1da177e4
LT		 282}
283
d51d081d
JHS		 284/*
285 * someday when pfkey also has support, we could have the code
286 * somehow made shareable and move it to xfrm_state.c - JHS
287 *
288*/
5424f32e 289static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs)
d51d081d 290{
5424f32e
TG		 291 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
292 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
293 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
294 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
d51d081d
JHS		 295
296 if (rp) {
297 struct xfrm_replay_state *replay;
5424f32e 298 replay = nla_data(rp);
d51d081d
JHS		 299 memcpy(&x->replay, replay, sizeof(*replay));
300 memcpy(&x->preplay, replay, sizeof(*replay));
301 }
302
303 if (lt) {
304 struct xfrm_lifetime_cur *ltime;
5424f32e 305 ltime = nla_data(lt);
d51d081d
JHS		 306 x->curlft.bytes = ltime->bytes;
307 x->curlft.packets = ltime->packets;
308 x->curlft.add_time = ltime->add_time;
309 x->curlft.use_time = ltime->use_time;
310 }
311
cf5cb79f 312 if (et)
5424f32e 313 x->replay_maxage = nla_get_u32(et);
d51d081d 314
cf5cb79f 315 if (rt)
5424f32e 316 x->replay_maxdiff = nla_get_u32(rt);
d51d081d
JHS		 317}
318
1da177e4 319static struct xfrm_state *xfrm_state_construct(struct xfrm_usersa_info *p,
5424f32e 320 struct nlattr **attrs,
1da177e4
LT		 321 int *errp)
322{
673c09be 323 struct xfrm_state *x = xfrm_state_alloc(&init_net);
1da177e4
LT		 324 int err = -ENOMEM;
325
326 if (!x)
327 goto error_no_put;
328
329 copy_from_user_state(x, p);
330
1a6509d9
HX		 331 if ((err = attach_aead(&x->aead, &x->props.ealgo,
332 attrs[XFRMA_ALG_AEAD])))
333 goto error;
1da177e4
LT		 334 if ((err = attach_one_algo(&x->aalg, &x->props.aalgo,
335 xfrm_aalg_get_byname,
35a7aa08 336 attrs[XFRMA_ALG_AUTH])))
1da177e4
LT		 337 goto error;
338 if ((err = attach_one_algo(&x->ealg, &x->props.ealgo,
339 xfrm_ealg_get_byname,
35a7aa08 340 attrs[XFRMA_ALG_CRYPT])))
1da177e4
LT		 341 goto error;
342 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
343 xfrm_calg_get_byname,
35a7aa08 344 attrs[XFRMA_ALG_COMP])))
1da177e4 345 goto error;
fd21150a
TG		 346
347 if (attrs[XFRMA_ENCAP]) {
348 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
349 sizeof(*x->encap), GFP_KERNEL);
350 if (x->encap == NULL)
351 goto error;
352 }
353
354 if (attrs[XFRMA_COADDR]) {
355 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
356 sizeof(*x->coaddr), GFP_KERNEL);
357 if (x->coaddr == NULL)
358 goto error;
359 }
360
72cb6962 361 err = xfrm_init_state(x);
1da177e4
LT		 362 if (err)
363 goto error;
364
fd21150a
TG		 365 if (attrs[XFRMA_SEC_CTX] &&
366 security_xfrm_state_alloc(x, nla_data(attrs[XFRMA_SEC_CTX])))
df71837d
TJ		 367 goto error;
368
1da177e4 369 x->km.seq = p->seq;
d51d081d
JHS		 370 x->replay_maxdiff = sysctl_xfrm_aevent_rseqth;
371 /* sysctl_xfrm_aevent_etime is in 100ms units */
372 x->replay_maxage = (sysctl_xfrm_aevent_etime*HZ)/XFRM_AE_ETH_M;
373 x->preplay.bitmap = 0;
374 x->preplay.seq = x->replay.seq+x->replay_maxdiff;
375 x->preplay.oseq = x->replay.oseq +x->replay_maxdiff;
376
377 /* override default values from above */
378
5424f32e 379 xfrm_update_ae_params(x, attrs);
1da177e4
LT		 380
381 return x;
382
383error:
384 x->km.state = XFRM_STATE_DEAD;
385 xfrm_state_put(x);
386error_no_put:
387 *errp = err;
388 return NULL;
389}
390
22e70050 391static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 392 struct nlattr **attrs)
1da177e4 393{
7b67c857 394 struct xfrm_usersa_info *p = nlmsg_data(nlh);
1da177e4
LT		 395 struct xfrm_state *x;
396 int err;
26b15dad 397 struct km_event c;
2532386f
EP		 398 uid_t loginuid = NETLINK_CB(skb).loginuid;
399 u32 sessionid = NETLINK_CB(skb).sessionid;
400 u32 sid = NETLINK_CB(skb).sid;
1da177e4 401
35a7aa08 402 err = verify_newsa_info(p, attrs);
1da177e4
LT		 403 if (err)
404 return err;
405
35a7aa08 406 x = xfrm_state_construct(p, attrs, &err);
1da177e4
LT		 407 if (!x)
408 return err;
409
26b15dad 410 xfrm_state_hold(x);
1da177e4
LT		 411 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
412 err = xfrm_state_add(x);
413 else
414 err = xfrm_state_update(x);
415
2532386f 416 xfrm_audit_state_add(x, err ? 0 : 1, loginuid, sessionid, sid);
161a09e7 417
1da177e4
LT		 418 if (err < 0) {
419 x->km.state = XFRM_STATE_DEAD;
21380b81 420 __xfrm_state_put(x);
7d6dfe1f 421 goto out;
1da177e4
LT		 422 }
423
26b15dad
JHS		 424 c.seq = nlh->nlmsg_seq;
425 c.pid = nlh->nlmsg_pid;
f60f6b8f 426 c.event = nlh->nlmsg_type;
26b15dad
JHS		 427
428 km_state_notify(x, &c);
7d6dfe1f 429out:
26b15dad 430 xfrm_state_put(x);
1da177e4
LT		 431 return err;
432}
433
eb2971b6 434static struct xfrm_state *xfrm_user_state_lookup(struct xfrm_usersa_id *p,
5424f32e 435 struct nlattr **attrs,
eb2971b6
MN		 436 int *errp)
437{
438 struct xfrm_state *x = NULL;
439 int err;
440
441 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
442 err = -ESRCH;
221df1ed 443 x = xfrm_state_lookup(&init_net, &p->daddr, p->spi, p->proto, p->family);
eb2971b6
MN		 444 } else {
445 xfrm_address_t *saddr = NULL;
446
35a7aa08 447 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
eb2971b6
MN		 448 if (!saddr) {
449 err = -EINVAL;
450 goto out;
451 }
452
9abbffee 453 err = -ESRCH;
221df1ed
AD		 454 x = xfrm_state_lookup_byaddr(&init_net, &p->daddr, saddr,
455 p->proto, p->family);
eb2971b6
MN		 456 }
457
458 out:
459 if (!x && errp)
460 *errp = err;
461 return x;
462}
463
22e70050 464static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 465 struct nlattr **attrs)
1da177e4
LT		 466{
467 struct xfrm_state *x;
eb2971b6 468 int err = -ESRCH;
26b15dad 469 struct km_event c;
7b67c857 470 struct xfrm_usersa_id *p = nlmsg_data(nlh);
2532386f
EP		 471 uid_t loginuid = NETLINK_CB(skb).loginuid;
472 u32 sessionid = NETLINK_CB(skb).sessionid;
473 u32 sid = NETLINK_CB(skb).sid;
1da177e4 474
35a7aa08 475 x = xfrm_user_state_lookup(p, attrs, &err);
1da177e4 476 if (x == NULL)
eb2971b6 477 return err;
1da177e4 478
6f68dc37 479 if ((err = security_xfrm_state_delete(x)) != 0)
c8c05a8e
CZ		 480 goto out;
481
1da177e4 482 if (xfrm_state_kern(x)) {
c8c05a8e
CZ		 483 err = -EPERM;
484 goto out;
1da177e4
LT		 485 }
486
26b15dad 487 err = xfrm_state_delete(x);
161a09e7 488
c8c05a8e
CZ		 489 if (err < 0)
490 goto out;
26b15dad
JHS		 491
492 c.seq = nlh->nlmsg_seq;
493 c.pid = nlh->nlmsg_pid;
f60f6b8f 494 c.event = nlh->nlmsg_type;
26b15dad 495 km_state_notify(x, &c);
1da177e4 496
c8c05a8e 497out:
2532386f 498 xfrm_audit_state_delete(x, err ? 0 : 1, loginuid, sessionid, sid);
c8c05a8e 499 xfrm_state_put(x);
26b15dad 500 return err;
1da177e4
LT		 501}
502
503static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
504{
505 memcpy(&p->id, &x->id, sizeof(p->id));
506 memcpy(&p->sel, &x->sel, sizeof(p->sel));
507 memcpy(&p->lft, &x->lft, sizeof(p->lft));
508 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
509 memcpy(&p->stats, &x->stats, sizeof(p->stats));
54489c14 510 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
1da177e4
LT		 511 p->mode = x->props.mode;
512 p->replay_window = x->props.replay_window;
513 p->reqid = x->props.reqid;
514 p->family = x->props.family;
515 p->flags = x->props.flags;
516 p->seq = x->km.seq;
517}
518
519struct xfrm_dump_info {
520 struct sk_buff *in_skb;
521 struct sk_buff *out_skb;
522 u32 nlmsg_seq;
523 u16 nlmsg_flags;
1da177e4
LT		 524};
525
c0144bea
TG		 526static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
527{
c0144bea
TG		 528 struct xfrm_user_sec_ctx *uctx;
529 struct nlattr *attr;
68325d3b 530 int ctx_size = sizeof(*uctx) + s->ctx_len;
c0144bea
TG		 531
532 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
533 if (attr == NULL)
534 return -EMSGSIZE;
535
536 uctx = nla_data(attr);
537 uctx->exttype = XFRMA_SEC_CTX;
538 uctx->len = ctx_size;
539 uctx->ctx_doi = s->ctx_doi;
540 uctx->ctx_alg = s->ctx_alg;
541 uctx->ctx_len = s->ctx_len;
542 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
543
544 return 0;
545}
546
68325d3b
HX		 547/* Don't change this without updating xfrm_sa_len! */
548static int copy_to_user_state_extra(struct xfrm_state *x,
549 struct xfrm_usersa_info *p,
550 struct sk_buff *skb)
1da177e4 551{
1da177e4
LT		 552 copy_to_user_state(x, p);
553
050f009e
HX		 554 if (x->coaddr)
555 NLA_PUT(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
556
557 if (x->lastused)
558 NLA_PUT_U64(skb, XFRMA_LASTUSED, x->lastused);
050f009e 559
1a6509d9
HX		 560 if (x->aead)
561 NLA_PUT(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead);
1da177e4 562 if (x->aalg)
0f99be0d 563 NLA_PUT(skb, XFRMA_ALG_AUTH, xfrm_alg_len(x->aalg), x->aalg);
1da177e4 564 if (x->ealg)
0f99be0d 565 NLA_PUT(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg);
1da177e4 566 if (x->calg)
c0144bea 567 NLA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
1da177e4
LT		 568
569 if (x->encap)
c0144bea 570 NLA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
1da177e4 571
c0144bea
TG		 572 if (x->security && copy_sec_ctx(x->security, skb) < 0)
573 goto nla_put_failure;
060f02a3 574
68325d3b
HX		 575 return 0;
576
577nla_put_failure:
578 return -EMSGSIZE;
579}
580
581static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
582{
583 struct xfrm_dump_info *sp = ptr;
584 struct sk_buff *in_skb = sp->in_skb;
585 struct sk_buff *skb = sp->out_skb;
586 struct xfrm_usersa_info *p;
587 struct nlmsghdr *nlh;
588 int err;
589
68325d3b
HX		 590 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq,
591 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
592 if (nlh == NULL)
593 return -EMSGSIZE;
594
595 p = nlmsg_data(nlh);
596
597 err = copy_to_user_state_extra(x, p, skb);
598 if (err)
599 goto nla_put_failure;
600
9825069d 601 nlmsg_end(skb, nlh);
1da177e4
LT		 602 return 0;
603
c0144bea 604nla_put_failure:
9825069d 605 nlmsg_cancel(skb, nlh);
68325d3b 606 return err;
1da177e4
LT		 607}
608
4c563f76
TT		 609static int xfrm_dump_sa_done(struct netlink_callback *cb)
610{
611 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
612 xfrm_state_walk_done(walk);
613 return 0;
614}
615
1da177e4
LT		 616static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
617{
4c563f76 618 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
1da177e4
LT		 619 struct xfrm_dump_info info;
620
4c563f76
TT		 621 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
622 sizeof(cb->args) - sizeof(cb->args[0]));
623
1da177e4
LT		 624 info.in_skb = cb->skb;
625 info.out_skb = skb;
626 info.nlmsg_seq = cb->nlh->nlmsg_seq;
627 info.nlmsg_flags = NLM_F_MULTI;
4c563f76
TT		 628
629 if (!cb->args[0]) {
630 cb->args[0] = 1;
631 xfrm_state_walk_init(walk, 0);
632 }
633
284fa7da 634 (void) xfrm_state_walk(&init_net, walk, dump_one_state, &info);
1da177e4
LT		 635
636 return skb->len;
637}
638
639static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
640 struct xfrm_state *x, u32 seq)
641{
642 struct xfrm_dump_info info;
643 struct sk_buff *skb;
644
7deb2264 645 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1da177e4
LT		 646 if (!skb)
647 return ERR_PTR(-ENOMEM);
648
1da177e4
LT		 649 info.in_skb = in_skb;
650 info.out_skb = skb;
651 info.nlmsg_seq = seq;
652 info.nlmsg_flags = 0;
1da177e4
LT		 653
654 if (dump_one_state(x, 0, &info)) {
655 kfree_skb(skb);
656 return NULL;
657 }
658
659 return skb;
660}
661
7deb2264
TG		 662static inline size_t xfrm_spdinfo_msgsize(void)
663{
664 return NLMSG_ALIGN(4)
665 + nla_total_size(sizeof(struct xfrmu_spdinfo))
666 + nla_total_size(sizeof(struct xfrmu_spdhinfo));
667}
668
ecfd6b18
JHS		 669static int build_spdinfo(struct sk_buff *skb, u32 pid, u32 seq, u32 flags)
670{
5a6d3416
JHS		 671 struct xfrmk_spdinfo si;
672 struct xfrmu_spdinfo spc;
673 struct xfrmu_spdhinfo sph;
ecfd6b18
JHS		 674 struct nlmsghdr *nlh;
675 u32 *f;
676
677 nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
678 if (nlh == NULL) /* shouldnt really happen ... */
679 return -EMSGSIZE;
680
681 f = nlmsg_data(nlh);
682 *f = flags;
683 xfrm_spd_getinfo(&si);
5a6d3416
JHS		 684 spc.incnt = si.incnt;
685 spc.outcnt = si.outcnt;
686 spc.fwdcnt = si.fwdcnt;
687 spc.inscnt = si.inscnt;
688 spc.outscnt = si.outscnt;
689 spc.fwdscnt = si.fwdscnt;
690 sph.spdhcnt = si.spdhcnt;
691 sph.spdhmcnt = si.spdhmcnt;
692
693 NLA_PUT(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
694 NLA_PUT(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
ecfd6b18
JHS		 695
696 return nlmsg_end(skb, nlh);
697
698nla_put_failure:
699 nlmsg_cancel(skb, nlh);
700 return -EMSGSIZE;
701}
702
703static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 704 struct nlattr **attrs)
ecfd6b18
JHS		 705{
706 struct sk_buff *r_skb;
7b67c857 707 u32 *flags = nlmsg_data(nlh);
ecfd6b18
JHS		 708 u32 spid = NETLINK_CB(skb).pid;
709 u32 seq = nlh->nlmsg_seq;
ecfd6b18 710
7deb2264 711 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
ecfd6b18
JHS		 712 if (r_skb == NULL)
713 return -ENOMEM;
714
715 if (build_spdinfo(r_skb, spid, seq, *flags) < 0)
716 BUG();
717
718 return nlmsg_unicast(xfrm_nl, r_skb, spid);
719}
720
7deb2264
TG		 721static inline size_t xfrm_sadinfo_msgsize(void)
722{
723 return NLMSG_ALIGN(4)
724 + nla_total_size(sizeof(struct xfrmu_sadhinfo))
725 + nla_total_size(4); /* XFRMA_SAD_CNT */
726}
727
28d8909b
JHS		 728static int build_sadinfo(struct sk_buff *skb, u32 pid, u32 seq, u32 flags)
729{
af11e316
JHS		 730 struct xfrmk_sadinfo si;
731 struct xfrmu_sadhinfo sh;
28d8909b
JHS		 732 struct nlmsghdr *nlh;
733 u32 *f;
734
735 nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
736 if (nlh == NULL) /* shouldnt really happen ... */
737 return -EMSGSIZE;
738
739 f = nlmsg_data(nlh);
740 *f = flags;
741 xfrm_sad_getinfo(&si);
742
af11e316
JHS		 743 sh.sadhmcnt = si.sadhmcnt;
744 sh.sadhcnt = si.sadhcnt;
745
746 NLA_PUT_U32(skb, XFRMA_SAD_CNT, si.sadcnt);
747 NLA_PUT(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
28d8909b
JHS		 748
749 return nlmsg_end(skb, nlh);
750
751nla_put_failure:
752 nlmsg_cancel(skb, nlh);
753 return -EMSGSIZE;
754}
755
756static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 757 struct nlattr **attrs)
28d8909b
JHS		 758{
759 struct sk_buff *r_skb;
7b67c857 760 u32 *flags = nlmsg_data(nlh);
28d8909b
JHS		 761 u32 spid = NETLINK_CB(skb).pid;
762 u32 seq = nlh->nlmsg_seq;
28d8909b 763
7deb2264 764 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
28d8909b
JHS		 765 if (r_skb == NULL)
766 return -ENOMEM;
767
768 if (build_sadinfo(r_skb, spid, seq, *flags) < 0)
769 BUG();
770
771 return nlmsg_unicast(xfrm_nl, r_skb, spid);
772}
773
22e70050 774static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 775 struct nlattr **attrs)
1da177e4 776{
7b67c857 777 struct xfrm_usersa_id *p = nlmsg_data(nlh);
1da177e4
LT		 778 struct xfrm_state *x;
779 struct sk_buff *resp_skb;
eb2971b6 780 int err = -ESRCH;
1da177e4 781
35a7aa08 782 x = xfrm_user_state_lookup(p, attrs, &err);
1da177e4
LT		 783 if (x == NULL)
784 goto out_noput;
785
786 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
787 if (IS_ERR(resp_skb)) {
788 err = PTR_ERR(resp_skb);
789 } else {
082a1ad5 790 err = nlmsg_unicast(xfrm_nl, resp_skb, NETLINK_CB(skb).pid);
1da177e4
LT		 791 }
792 xfrm_state_put(x);
793out_noput:
794 return err;
795}
796
797static int verify_userspi_info(struct xfrm_userspi_info *p)
798{
799 switch (p->info.id.proto) {
800 case IPPROTO_AH:
801 case IPPROTO_ESP:
802 break;
803
804 case IPPROTO_COMP:
805 /* IPCOMP spi is 16-bits. */
806 if (p->max >= 0x10000)
807 return -EINVAL;
808 break;
809
810 default:
811 return -EINVAL;
3ff50b79 812 }
1da177e4
LT		 813
814 if (p->min > p->max)
815 return -EINVAL;
816
817 return 0;
818}
819
22e70050 820static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 821 struct nlattr **attrs)
1da177e4
LT		 822{
823 struct xfrm_state *x;
824 struct xfrm_userspi_info *p;
825 struct sk_buff *resp_skb;
826 xfrm_address_t *daddr;
827 int family;
828 int err;
829
7b67c857 830 p = nlmsg_data(nlh);
1da177e4
LT		 831 err = verify_userspi_info(p);
832 if (err)
833 goto out_noput;
834
835 family = p->info.family;
836 daddr = &p->info.id.daddr;
837
838 x = NULL;
839 if (p->info.seq) {
5447c5e4 840 x = xfrm_find_acq_byseq(&init_net, p->info.seq);
1da177e4
LT		 841 if (x && xfrm_addr_cmp(&x->id.daddr, daddr, family)) {
842 xfrm_state_put(x);
843 x = NULL;
844 }
845 }
846
847 if (!x)
5447c5e4 848 x = xfrm_find_acq(&init_net, p->info.mode, p->info.reqid,
1da177e4
LT		 849 p->info.id.proto, daddr,
850 &p->info.saddr, 1,
851 family);
852 err = -ENOENT;
853 if (x == NULL)
854 goto out_noput;
855
658b219e
HX		 856 err = xfrm_alloc_spi(x, p->min, p->max);
857 if (err)
858 goto out;
1da177e4 859
658b219e 860 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1da177e4
LT		 861 if (IS_ERR(resp_skb)) {
862 err = PTR_ERR(resp_skb);
863 goto out;
864 }
865
082a1ad5 866 err = nlmsg_unicast(xfrm_nl, resp_skb, NETLINK_CB(skb).pid);
1da177e4
LT		 867
868out:
869 xfrm_state_put(x);
870out_noput:
871 return err;
872}
873
b798a9ed 874static int verify_policy_dir(u8 dir)
1da177e4
LT		 875{
876 switch (dir) {
877 case XFRM_POLICY_IN:
878 case XFRM_POLICY_OUT:
879 case XFRM_POLICY_FWD:
880 break;
881
882 default:
883 return -EINVAL;
3ff50b79 884 }
1da177e4
LT		 885
886 return 0;
887}
888
b798a9ed 889static int verify_policy_type(u8 type)
f7b6983f
MN		 890{
891 switch (type) {
892 case XFRM_POLICY_TYPE_MAIN:
893#ifdef CONFIG_XFRM_SUB_POLICY
894 case XFRM_POLICY_TYPE_SUB:
895#endif
896 break;
897
898 default:
899 return -EINVAL;
3ff50b79 900 }
f7b6983f
MN		 901
902 return 0;
903}
904
1da177e4
LT		 905static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
906{
907 switch (p->share) {
908 case XFRM_SHARE_ANY:
909 case XFRM_SHARE_SESSION:
910 case XFRM_SHARE_USER:
911 case XFRM_SHARE_UNIQUE:
912 break;
913
914 default:
915 return -EINVAL;
3ff50b79 916 }
1da177e4
LT		 917
918 switch (p->action) {
919 case XFRM_POLICY_ALLOW:
920 case XFRM_POLICY_BLOCK:
921 break;
922
923 default:
924 return -EINVAL;
3ff50b79 925 }
1da177e4
LT		 926
927 switch (p->sel.family) {
928 case AF_INET:
929 break;
930
931 case AF_INET6:
932#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
933 break;
934#else
935 return -EAFNOSUPPORT;
936#endif
937
938 default:
939 return -EINVAL;
3ff50b79 940 }
1da177e4
LT		 941
942 return verify_policy_dir(p->dir);
943}
944
5424f32e 945static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
df71837d 946{
5424f32e 947 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
df71837d
TJ		 948 struct xfrm_user_sec_ctx *uctx;
949
950 if (!rt)
951 return 0;
952
5424f32e 953 uctx = nla_data(rt);
03e1ad7b 954 return security_xfrm_policy_alloc(&pol->security, uctx);
df71837d
TJ		 955}
956
1da177e4
LT		 957static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
958 int nr)
959{
960 int i;
961
962 xp->xfrm_nr = nr;
963 for (i = 0; i < nr; i++, ut++) {
964 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
965
966 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
967 memcpy(&t->saddr, &ut->saddr,
968 sizeof(xfrm_address_t));
969 t->reqid = ut->reqid;
970 t->mode = ut->mode;
971 t->share = ut->share;
972 t->optional = ut->optional;
973 t->aalgos = ut->aalgos;
974 t->ealgos = ut->ealgos;
975 t->calgos = ut->calgos;
c5d18e98
HX		 976 /* If all masks are ~0, then we allow all algorithms. */
977 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
8511d01d 978 t->encap_family = ut->family;
1da177e4
LT		 979 }
980}
981
b4ad86bf
DM		 982static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
983{
984 int i;
985
986 if (nr > XFRM_MAX_DEPTH)
987 return -EINVAL;
988
989 for (i = 0; i < nr; i++) {
990 /* We never validated the ut->family value, so many
991 * applications simply leave it at zero. The check was
992 * never made and ut->family was ignored because all
993 * templates could be assumed to have the same family as
994 * the policy itself. Now that we will have ipv4-in-ipv6
995 * and ipv6-in-ipv4 tunnels, this is no longer true.
996 */
997 if (!ut[i].family)
998 ut[i].family = family;
999
1000 switch (ut[i].family) {
1001 case AF_INET:
1002 break;
1003#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1004 case AF_INET6:
1005 break;
1006#endif
1007 default:
1008 return -EINVAL;
3ff50b79 1009 }
b4ad86bf
DM		 1010 }
1011
1012 return 0;
1013}
1014
5424f32e 1015static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1da177e4 1016{
5424f32e 1017 struct nlattr *rt = attrs[XFRMA_TMPL];
1da177e4
LT		 1018
1019 if (!rt) {
1020 pol->xfrm_nr = 0;
1021 } else {
5424f32e
TG		 1022 struct xfrm_user_tmpl *utmpl = nla_data(rt);
1023 int nr = nla_len(rt) / sizeof(*utmpl);
b4ad86bf 1024 int err;
1da177e4 1025
b4ad86bf
DM		 1026 err = validate_tmpl(nr, utmpl, pol->family);
1027 if (err)
1028 return err;
1da177e4 1029
5424f32e 1030 copy_templates(pol, utmpl, nr);
1da177e4
LT		 1031 }
1032 return 0;
1033}
1034
5424f32e 1035static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
f7b6983f 1036{
5424f32e 1037 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
f7b6983f 1038 struct xfrm_userpolicy_type *upt;
b798a9ed 1039 u8 type = XFRM_POLICY_TYPE_MAIN;
f7b6983f
MN		 1040 int err;
1041
1042 if (rt) {
5424f32e 1043 upt = nla_data(rt);
f7b6983f
MN		 1044 type = upt->type;
1045 }
1046
1047 err = verify_policy_type(type);
1048 if (err)
1049 return err;
1050
1051 *tp = type;
1052 return 0;
1053}
1054
1da177e4
LT		 1055static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1056{
1057 xp->priority = p->priority;
1058 xp->index = p->index;
1059 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1060 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1061 xp->action = p->action;
1062 xp->flags = p->flags;
1063 xp->family = p->sel.family;
1064 /* XXX xp->share = p->share; */
1065}
1066
1067static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1068{
1069 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1070 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1071 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1072 p->priority = xp->priority;
1073 p->index = xp->index;
1074 p->sel.family = xp->family;
1075 p->dir = dir;
1076 p->action = xp->action;
1077 p->flags = xp->flags;
1078 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1079}
1080
5424f32e 1081static struct xfrm_policy *xfrm_policy_construct(struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1da177e4 1082{
0331b1f3 1083 struct xfrm_policy *xp = xfrm_policy_alloc(&init_net, GFP_KERNEL);
1da177e4
LT		 1084 int err;
1085
1086 if (!xp) {
1087 *errp = -ENOMEM;
1088 return NULL;
1089 }
1090
1091 copy_from_user_policy(xp, p);
df71837d 1092
35a7aa08 1093 err = copy_from_user_policy_type(&xp->type, attrs);
f7b6983f
MN		 1094 if (err)
1095 goto error;
1096
35a7aa08
TG		 1097 if (!(err = copy_from_user_tmpl(xp, attrs)))
1098 err = copy_from_user_sec_ctx(xp, attrs);
f7b6983f
MN		 1099 if (err)
1100 goto error;
1da177e4
LT		 1101
1102 return xp;
f7b6983f
MN		 1103 error:
1104 *errp = err;
12a169e7 1105 xp->walk.dead = 1;
64c31b3f 1106 xfrm_policy_destroy(xp);
f7b6983f 1107 return NULL;
1da177e4
LT		 1108}
1109
22e70050 1110static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1111 struct nlattr **attrs)
1da177e4 1112{
7b67c857 1113 struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1da177e4 1114 struct xfrm_policy *xp;
26b15dad 1115 struct km_event c;
1da177e4
LT		 1116 int err;
1117 int excl;
2532386f
EP		 1118 uid_t loginuid = NETLINK_CB(skb).loginuid;
1119 u32 sessionid = NETLINK_CB(skb).sessionid;
1120 u32 sid = NETLINK_CB(skb).sid;
1da177e4
LT		 1121
1122 err = verify_newpolicy_info(p);
df71837d
TJ		 1123 if (err)
1124 return err;
35a7aa08 1125 err = verify_sec_ctx_len(attrs);
1da177e4
LT		 1126 if (err)
1127 return err;
1128
35a7aa08 1129 xp = xfrm_policy_construct(p, attrs, &err);
1da177e4
LT		 1130 if (!xp)
1131 return err;
1132
26b15dad
JHS		 1133 /* shouldnt excl be based on nlh flags??
1134 * Aha! this is anti-netlink really i.e more pfkey derived
1135 * in netlink excl is a flag and you wouldnt need
1136 * a type XFRM_MSG_UPDPOLICY - JHS */
1da177e4
LT		 1137 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1138 err = xfrm_policy_insert(p->dir, xp, excl);
2532386f 1139 xfrm_audit_policy_add(xp, err ? 0 : 1, loginuid, sessionid, sid);
161a09e7 1140
1da177e4 1141 if (err) {
03e1ad7b 1142 security_xfrm_policy_free(xp->security);
1da177e4
LT		 1143 kfree(xp);
1144 return err;
1145 }
1146
f60f6b8f 1147 c.event = nlh->nlmsg_type;
26b15dad
JHS		 1148 c.seq = nlh->nlmsg_seq;
1149 c.pid = nlh->nlmsg_pid;
1150 km_policy_notify(xp, p->dir, &c);
1151
1da177e4
LT		 1152 xfrm_pol_put(xp);
1153
1154 return 0;
1155}
1156
1157static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1158{
1159 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1160 int i;
1161
1162 if (xp->xfrm_nr == 0)
1163 return 0;
1164
1165 for (i = 0; i < xp->xfrm_nr; i++) {
1166 struct xfrm_user_tmpl *up = &vec[i];
1167 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1168
1169 memcpy(&up->id, &kp->id, sizeof(up->id));
8511d01d 1170 up->family = kp->encap_family;
1da177e4
LT		 1171 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1172 up->reqid = kp->reqid;
1173 up->mode = kp->mode;
1174 up->share = kp->share;
1175 up->optional = kp->optional;
1176 up->aalgos = kp->aalgos;
1177 up->ealgos = kp->ealgos;
1178 up->calgos = kp->calgos;
1179 }
df71837d 1180
c0144bea
TG		 1181 return nla_put(skb, XFRMA_TMPL,
1182 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
0d681623
SH		 1183}
1184
1185static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1186{
1187 if (x->security) {
1188 return copy_sec_ctx(x->security, skb);
df71837d
TJ		 1189 }
1190 return 0;
0d681623 1191}
df71837d 1192
0d681623
SH		 1193static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1194{
1195 if (xp->security) {
1196 return copy_sec_ctx(xp->security, skb);
1197 }
1198 return 0;
df71837d 1199}
cfbfd45a
TG		 1200static inline size_t userpolicy_type_attrsize(void)
1201{
1202#ifdef CONFIG_XFRM_SUB_POLICY
1203 return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1204#else
1205 return 0;
1206#endif
1207}
df71837d 1208
f7b6983f 1209#ifdef CONFIG_XFRM_SUB_POLICY
b798a9ed 1210static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
f7b6983f 1211{
c0144bea
TG		 1212 struct xfrm_userpolicy_type upt = {
1213 .type = type,
1214 };
f7b6983f 1215
c0144bea 1216 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
f7b6983f
MN		 1217}
1218
1219#else
b798a9ed 1220static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
f7b6983f
MN		 1221{
1222 return 0;
1223}
1224#endif
1225
1da177e4
LT		 1226static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1227{
1228 struct xfrm_dump_info *sp = ptr;
1229 struct xfrm_userpolicy_info *p;
1230 struct sk_buff *in_skb = sp->in_skb;
1231 struct sk_buff *skb = sp->out_skb;
1232 struct nlmsghdr *nlh;
1da177e4 1233
79b8b7f4
TG		 1234 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq,
1235 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1236 if (nlh == NULL)
1237 return -EMSGSIZE;
1da177e4 1238
7b67c857 1239 p = nlmsg_data(nlh);
1da177e4
LT		 1240 copy_to_user_policy(xp, p, dir);
1241 if (copy_to_user_tmpl(xp, skb) < 0)
1242 goto nlmsg_failure;
df71837d
TJ		 1243 if (copy_to_user_sec_ctx(xp, skb))
1244 goto nlmsg_failure;
1459bb36 1245 if (copy_to_user_policy_type(xp->type, skb) < 0)
f7b6983f 1246 goto nlmsg_failure;
1da177e4 1247
9825069d 1248 nlmsg_end(skb, nlh);
1da177e4
LT		 1249 return 0;
1250
1251nlmsg_failure:
9825069d
TG		 1252 nlmsg_cancel(skb, nlh);
1253 return -EMSGSIZE;
1da177e4
LT		 1254}
1255
4c563f76
TT		 1256static int xfrm_dump_policy_done(struct netlink_callback *cb)
1257{
1258 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1259
1260 xfrm_policy_walk_done(walk);
1261 return 0;
1262}
1263
1da177e4
LT		 1264static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1265{
4c563f76 1266 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1da177e4
LT		 1267 struct xfrm_dump_info info;
1268
4c563f76
TT		 1269 BUILD_BUG_ON(sizeof(struct xfrm_policy_walk) >
1270 sizeof(cb->args) - sizeof(cb->args[0]));
1271
1da177e4
LT		 1272 info.in_skb = cb->skb;
1273 info.out_skb = skb;
1274 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1275 info.nlmsg_flags = NLM_F_MULTI;
4c563f76
TT		 1276
1277 if (!cb->args[0]) {
1278 cb->args[0] = 1;
1279 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1280 }
1281
cdcbca7c 1282 (void) xfrm_policy_walk(&init_net, walk, dump_one_policy, &info);
1da177e4
LT		 1283
1284 return skb->len;
1285}
1286
1287static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1288 struct xfrm_policy *xp,
1289 int dir, u32 seq)
1290{
1291 struct xfrm_dump_info info;
1292 struct sk_buff *skb;
1293
7deb2264 1294 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1da177e4
LT		 1295 if (!skb)
1296 return ERR_PTR(-ENOMEM);
1297
1da177e4
LT		 1298 info.in_skb = in_skb;
1299 info.out_skb = skb;
1300 info.nlmsg_seq = seq;
1301 info.nlmsg_flags = 0;
1da177e4
LT		 1302
1303 if (dump_one_policy(xp, dir, 0, &info) < 0) {
1304 kfree_skb(skb);
1305 return NULL;
1306 }
1307
1308 return skb;
1309}
1310
22e70050 1311static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1312 struct nlattr **attrs)
1da177e4
LT		 1313{
1314 struct xfrm_policy *xp;
1315 struct xfrm_userpolicy_id *p;
b798a9ed 1316 u8 type = XFRM_POLICY_TYPE_MAIN;
1da177e4 1317 int err;
26b15dad 1318 struct km_event c;
1da177e4
LT		 1319 int delete;
1320
7b67c857 1321 p = nlmsg_data(nlh);
1da177e4
LT		 1322 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1323
35a7aa08 1324 err = copy_from_user_policy_type(&type, attrs);
f7b6983f
MN		 1325 if (err)
1326 return err;
1327
1da177e4
LT		 1328 err = verify_policy_dir(p->dir);
1329 if (err)
1330 return err;
1331
1332 if (p->index)
8d1211a6 1333 xp = xfrm_policy_byid(&init_net, type, p->dir, p->index, delete, &err);
df71837d 1334 else {
5424f32e 1335 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
03e1ad7b 1336 struct xfrm_sec_ctx *ctx;
df71837d 1337
35a7aa08 1338 err = verify_sec_ctx_len(attrs);
df71837d
TJ		 1339 if (err)
1340 return err;
1341
2c8dd116 1342 ctx = NULL;
df71837d 1343 if (rt) {
5424f32e 1344 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
df71837d 1345
03e1ad7b
PM		 1346 err = security_xfrm_policy_alloc(&ctx, uctx);
1347 if (err)
df71837d 1348 return err;
2c8dd116 1349 }
8d1211a6 1350 xp = xfrm_policy_bysel_ctx(&init_net, type, p->dir, &p->sel, ctx,
ef41aaa0 1351 delete, &err);
03e1ad7b 1352 security_xfrm_policy_free(ctx);
df71837d 1353 }
1da177e4
LT		 1354 if (xp == NULL)
1355 return -ENOENT;
1356
1357 if (!delete) {
1358 struct sk_buff *resp_skb;
1359
1360 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1361 if (IS_ERR(resp_skb)) {
1362 err = PTR_ERR(resp_skb);
1363 } else {
082a1ad5
TG		 1364 err = nlmsg_unicast(xfrm_nl, resp_skb,
1365 NETLINK_CB(skb).pid);
1da177e4 1366 }
26b15dad 1367 } else {
2532386f
EP		 1368 uid_t loginuid = NETLINK_CB(skb).loginuid;
1369 u32 sessionid = NETLINK_CB(skb).sessionid;
1370 u32 sid = NETLINK_CB(skb).sid;
1371
1372 xfrm_audit_policy_delete(xp, err ? 0 : 1, loginuid, sessionid,
1373 sid);
13fcfbb0
DM		 1374
1375 if (err != 0)
c8c05a8e 1376 goto out;
13fcfbb0 1377
e7443892 1378 c.data.byid = p->index;
f60f6b8f 1379 c.event = nlh->nlmsg_type;
26b15dad
JHS		 1380 c.seq = nlh->nlmsg_seq;
1381 c.pid = nlh->nlmsg_pid;
1382 km_policy_notify(xp, p->dir, &c);
1da177e4
LT		 1383 }
1384
c8c05a8e 1385out:
ef41aaa0 1386 xfrm_pol_put(xp);
1da177e4
LT		 1387 return err;
1388}
1389
22e70050 1390static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1391 struct nlattr **attrs)
1da177e4 1392{
26b15dad 1393 struct km_event c;
7b67c857 1394 struct xfrm_usersa_flush *p = nlmsg_data(nlh);
161a09e7 1395 struct xfrm_audit audit_info;
4aa2e62c 1396 int err;
1da177e4 1397
161a09e7 1398 audit_info.loginuid = NETLINK_CB(skb).loginuid;
2532386f 1399 audit_info.sessionid = NETLINK_CB(skb).sessionid;
161a09e7 1400 audit_info.secid = NETLINK_CB(skb).sid;
0e602451 1401 err = xfrm_state_flush(&init_net, p->proto, &audit_info);
4aa2e62c
JL		 1402 if (err)
1403 return err;
bf08867f 1404 c.data.proto = p->proto;
f60f6b8f 1405 c.event = nlh->nlmsg_type;
26b15dad
JHS		 1406 c.seq = nlh->nlmsg_seq;
1407 c.pid = nlh->nlmsg_pid;
1408 km_state_notify(NULL, &c);
1409
1da177e4
LT		 1410 return 0;
1411}
1412
7deb2264
TG		 1413static inline size_t xfrm_aevent_msgsize(void)
1414{
1415 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
1416 + nla_total_size(sizeof(struct xfrm_replay_state))
1417 + nla_total_size(sizeof(struct xfrm_lifetime_cur))
1418 + nla_total_size(4) /* XFRM_AE_RTHR */
1419 + nla_total_size(4); /* XFRM_AE_ETHR */
1420}
d51d081d
JHS		 1421
1422static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c)
1423{
1424 struct xfrm_aevent_id *id;
1425 struct nlmsghdr *nlh;
d51d081d 1426
79b8b7f4
TG		 1427 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
1428 if (nlh == NULL)
1429 return -EMSGSIZE;
d51d081d 1430
7b67c857 1431 id = nlmsg_data(nlh);
2b5f6dcc 1432 memcpy(&id->sa_id.daddr, &x->id.daddr,sizeof(x->id.daddr));
d51d081d
JHS		 1433 id->sa_id.spi = x->id.spi;
1434 id->sa_id.family = x->props.family;
1435 id->sa_id.proto = x->id.proto;
2b5f6dcc
JHS		 1436 memcpy(&id->saddr, &x->props.saddr,sizeof(x->props.saddr));
1437 id->reqid = x->props.reqid;
d51d081d
JHS		 1438 id->flags = c->data.aevent;
1439
c0144bea
TG		 1440 NLA_PUT(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), &x->replay);
1441 NLA_PUT(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft);
d51d081d 1442
c0144bea
TG		 1443 if (id->flags & XFRM_AE_RTHR)
1444 NLA_PUT_U32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
d51d081d 1445
c0144bea
TG		 1446 if (id->flags & XFRM_AE_ETHR)
1447 NLA_PUT_U32(skb, XFRMA_ETIMER_THRESH,
1448 x->replay_maxage * 10 / HZ);
d51d081d 1449
9825069d 1450 return nlmsg_end(skb, nlh);
d51d081d 1451
c0144bea 1452nla_put_failure:
9825069d
TG		 1453 nlmsg_cancel(skb, nlh);
1454 return -EMSGSIZE;
d51d081d
JHS		 1455}
1456
22e70050 1457static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1458 struct nlattr **attrs)
d51d081d
JHS		 1459{
1460 struct xfrm_state *x;
1461 struct sk_buff *r_skb;
1462 int err;
1463 struct km_event c;
7b67c857 1464 struct xfrm_aevent_id *p = nlmsg_data(nlh);
d51d081d
JHS		 1465 struct xfrm_usersa_id *id = &p->sa_id;
1466
7deb2264 1467 r_skb = nlmsg_new(xfrm_aevent_msgsize(), GFP_ATOMIC);
d51d081d
JHS		 1468 if (r_skb == NULL)
1469 return -ENOMEM;
1470
221df1ed 1471 x = xfrm_state_lookup(&init_net, &id->daddr, id->spi, id->proto, id->family);
d51d081d 1472 if (x == NULL) {
b08d5840 1473 kfree_skb(r_skb);
d51d081d
JHS		 1474 return -ESRCH;
1475 }
1476
1477 /*
1478 * XXX: is this lock really needed - none of the other
1479 * gets lock (the concern is things getting updated
1480 * while we are still reading) - jhs
1481 */
1482 spin_lock_bh(&x->lock);
1483 c.data.aevent = p->flags;
1484 c.seq = nlh->nlmsg_seq;
1485 c.pid = nlh->nlmsg_pid;
1486
1487 if (build_aevent(r_skb, x, &c) < 0)
1488 BUG();
082a1ad5 1489 err = nlmsg_unicast(xfrm_nl, r_skb, NETLINK_CB(skb).pid);
d51d081d
JHS		 1490 spin_unlock_bh(&x->lock);
1491 xfrm_state_put(x);
1492 return err;
1493}
1494
22e70050 1495static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1496 struct nlattr **attrs)
d51d081d
JHS		 1497{
1498 struct xfrm_state *x;
1499 struct km_event c;
1500 int err = - EINVAL;
7b67c857 1501 struct xfrm_aevent_id *p = nlmsg_data(nlh);
5424f32e
TG		 1502 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
1503 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
d51d081d
JHS		 1504
1505 if (!lt && !rp)
1506 return err;
1507
1508 /* pedantic mode - thou shalt sayeth replaceth */
1509 if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
1510 return err;
1511
221df1ed 1512 x = xfrm_state_lookup(&init_net, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
d51d081d
JHS		 1513 if (x == NULL)
1514 return -ESRCH;
1515
1516 if (x->km.state != XFRM_STATE_VALID)
1517 goto out;
1518
1519 spin_lock_bh(&x->lock);
35a7aa08 1520 xfrm_update_ae_params(x, attrs);
d51d081d 1521 spin_unlock_bh(&x->lock);
d51d081d
JHS		 1522
1523 c.event = nlh->nlmsg_type;
1524 c.seq = nlh->nlmsg_seq;
1525 c.pid = nlh->nlmsg_pid;
1526 c.data.aevent = XFRM_AE_CU;
1527 km_state_notify(x, &c);
1528 err = 0;
1529out:
1530 xfrm_state_put(x);
1531 return err;
1532}
1533
22e70050 1534static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1535 struct nlattr **attrs)
1da177e4 1536{
f7b6983f 1537 struct km_event c;
b798a9ed 1538 u8 type = XFRM_POLICY_TYPE_MAIN;
f7b6983f 1539 int err;
161a09e7 1540 struct xfrm_audit audit_info;
f7b6983f 1541
35a7aa08 1542 err = copy_from_user_policy_type(&type, attrs);
f7b6983f
MN		 1543 if (err)
1544 return err;
26b15dad 1545
161a09e7 1546 audit_info.loginuid = NETLINK_CB(skb).loginuid;
2532386f 1547 audit_info.sessionid = NETLINK_CB(skb).sessionid;
161a09e7 1548 audit_info.secid = NETLINK_CB(skb).sid;
33ffbbd5 1549 err = xfrm_policy_flush(&init_net, type, &audit_info);
4aa2e62c
JL		 1550 if (err)
1551 return err;
f7b6983f 1552 c.data.type = type;
f60f6b8f 1553 c.event = nlh->nlmsg_type;
26b15dad
JHS		 1554 c.seq = nlh->nlmsg_seq;
1555 c.pid = nlh->nlmsg_pid;
1556 km_policy_notify(NULL, 0, &c);
1da177e4
LT		 1557 return 0;
1558}
1559
22e70050 1560static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1561 struct nlattr **attrs)
6c5c8ca7
JHS		 1562{
1563 struct xfrm_policy *xp;
7b67c857 1564 struct xfrm_user_polexpire *up = nlmsg_data(nlh);
6c5c8ca7 1565 struct xfrm_userpolicy_info *p = &up->pol;
b798a9ed 1566 u8 type = XFRM_POLICY_TYPE_MAIN;
6c5c8ca7
JHS		 1567 int err = -ENOENT;
1568
35a7aa08 1569 err = copy_from_user_policy_type(&type, attrs);
f7b6983f
MN		 1570 if (err)
1571 return err;
1572
6c5c8ca7 1573 if (p->index)
8d1211a6 1574 xp = xfrm_policy_byid(&init_net, type, p->dir, p->index, 0, &err);
6c5c8ca7 1575 else {
5424f32e 1576 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
03e1ad7b 1577 struct xfrm_sec_ctx *ctx;
6c5c8ca7 1578
35a7aa08 1579 err = verify_sec_ctx_len(attrs);
6c5c8ca7
JHS		 1580 if (err)
1581 return err;
1582
2c8dd116 1583 ctx = NULL;
6c5c8ca7 1584 if (rt) {
5424f32e 1585 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
6c5c8ca7 1586
03e1ad7b
PM		 1587 err = security_xfrm_policy_alloc(&ctx, uctx);
1588 if (err)
6c5c8ca7 1589 return err;
2c8dd116 1590 }
8d1211a6 1591 xp = xfrm_policy_bysel_ctx(&init_net, type, p->dir, &p->sel, ctx, 0, &err);
03e1ad7b 1592 security_xfrm_policy_free(ctx);
6c5c8ca7 1593 }
6c5c8ca7 1594 if (xp == NULL)
ef41aaa0 1595 return -ENOENT;
03e1ad7b 1596
ef41aaa0 1597 read_lock(&xp->lock);
12a169e7 1598 if (xp->walk.dead) {
6c5c8ca7
JHS		 1599 read_unlock(&xp->lock);
1600 goto out;
1601 }
1602
1603 read_unlock(&xp->lock);
1604 err = 0;
1605 if (up->hard) {
2532386f
EP		 1606 uid_t loginuid = NETLINK_CB(skb).loginuid;
1607 uid_t sessionid = NETLINK_CB(skb).sessionid;
1608 u32 sid = NETLINK_CB(skb).sid;
6c5c8ca7 1609 xfrm_policy_delete(xp, p->dir);
2532386f 1610 xfrm_audit_policy_delete(xp, 1, loginuid, sessionid, sid);
161a09e7 1611
6c5c8ca7
JHS		 1612 } else {
1613 // reset the timers here?
1614 printk("Dont know what to do with soft policy expire\n");
1615 }
1616 km_policy_expired(xp, p->dir, up->hard, current->pid);
1617
1618out:
1619 xfrm_pol_put(xp);
1620 return err;
1621}
1622
22e70050 1623static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1624 struct nlattr **attrs)
53bc6b4d
JHS		 1625{
1626 struct xfrm_state *x;
1627 int err;
7b67c857 1628 struct xfrm_user_expire *ue = nlmsg_data(nlh);
53bc6b4d
JHS		 1629 struct xfrm_usersa_info *p = &ue->state;
1630
221df1ed 1631 x = xfrm_state_lookup(&init_net, &p->id.daddr, p->id.spi, p->id.proto, p->family);
53bc6b4d 1632
3a765aa5 1633 err = -ENOENT;
53bc6b4d
JHS		 1634 if (x == NULL)
1635 return err;
1636
53bc6b4d 1637 spin_lock_bh(&x->lock);
3a765aa5 1638 err = -EINVAL;
53bc6b4d
JHS		 1639 if (x->km.state != XFRM_STATE_VALID)
1640 goto out;
1641 km_state_expired(x, ue->hard, current->pid);
1642
161a09e7 1643 if (ue->hard) {
2532386f
EP		 1644 uid_t loginuid = NETLINK_CB(skb).loginuid;
1645 uid_t sessionid = NETLINK_CB(skb).sessionid;
1646 u32 sid = NETLINK_CB(skb).sid;
53bc6b4d 1647 __xfrm_state_delete(x);
2532386f 1648 xfrm_audit_state_delete(x, 1, loginuid, sessionid, sid);
161a09e7 1649 }
3a765aa5 1650 err = 0;
53bc6b4d
JHS		 1651out:
1652 spin_unlock_bh(&x->lock);
1653 xfrm_state_put(x);
1654 return err;
1655}
1656
22e70050 1657static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1658 struct nlattr **attrs)
980ebd25
JHS		 1659{
1660 struct xfrm_policy *xp;
1661 struct xfrm_user_tmpl *ut;
1662 int i;
5424f32e 1663 struct nlattr *rt = attrs[XFRMA_TMPL];
980ebd25 1664
7b67c857 1665 struct xfrm_user_acquire *ua = nlmsg_data(nlh);
673c09be 1666 struct xfrm_state *x = xfrm_state_alloc(&init_net);
980ebd25
JHS		 1667 int err = -ENOMEM;
1668
1669 if (!x)
1670 return err;
1671
1672 err = verify_newpolicy_info(&ua->policy);
1673 if (err) {
1674 printk("BAD policy passed\n");
1675 kfree(x);
1676 return err;
1677 }
1678
1679 /* build an XP */
5424f32e 1680 xp = xfrm_policy_construct(&ua->policy, attrs, &err);
b4ad86bf 1681 if (!xp) {
980ebd25
JHS		 1682 kfree(x);
1683 return err;
1684 }
1685
1686 memcpy(&x->id, &ua->id, sizeof(ua->id));
1687 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
1688 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
1689
5424f32e 1690 ut = nla_data(rt);
980ebd25
JHS		 1691 /* extract the templates and for each call km_key */
1692 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
1693 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1694 memcpy(&x->id, &t->id, sizeof(x->id));
1695 x->props.mode = t->mode;
1696 x->props.reqid = t->reqid;
1697 x->props.family = ut->family;
1698 t->aalgos = ua->aalgos;
1699 t->ealgos = ua->ealgos;
1700 t->calgos = ua->calgos;
1701 err = km_query(x, t, xp);
1702
1703 }
1704
1705 kfree(x);
1706 kfree(xp);
1707
1708 return 0;
1709}
1710
5c79de6e 1711#ifdef CONFIG_XFRM_MIGRATE
5c79de6e 1712static int copy_from_user_migrate(struct xfrm_migrate *ma,
13c1d189 1713 struct xfrm_kmaddress *k,
5424f32e 1714 struct nlattr **attrs, int *num)
5c79de6e 1715{
5424f32e 1716 struct nlattr *rt = attrs[XFRMA_MIGRATE];
5c79de6e
SS		 1717 struct xfrm_user_migrate *um;
1718 int i, num_migrate;
1719
13c1d189
AE		 1720 if (k != NULL) {
1721 struct xfrm_user_kmaddress *uk;
1722
1723 uk = nla_data(attrs[XFRMA_KMADDRESS]);
1724 memcpy(&k->local, &uk->local, sizeof(k->local));
1725 memcpy(&k->remote, &uk->remote, sizeof(k->remote));
1726 k->family = uk->family;
1727 k->reserved = uk->reserved;
1728 }
1729
5424f32e
TG		 1730 um = nla_data(rt);
1731 num_migrate = nla_len(rt) / sizeof(*um);
5c79de6e
SS		 1732
1733 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
1734 return -EINVAL;
1735
1736 for (i = 0; i < num_migrate; i++, um++, ma++) {
1737 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
1738 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
1739 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
1740 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
1741
1742 ma->proto = um->proto;
1743 ma->mode = um->mode;
1744 ma->reqid = um->reqid;
1745
1746 ma->old_family = um->old_family;
1747 ma->new_family = um->new_family;
1748 }
1749
1750 *num = i;
1751 return 0;
1752}
1753
1754static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1755 struct nlattr **attrs)
5c79de6e 1756{
7b67c857 1757 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
5c79de6e 1758 struct xfrm_migrate m[XFRM_MAX_DEPTH];
13c1d189 1759 struct xfrm_kmaddress km, *kmp;
5c79de6e
SS		 1760 u8 type;
1761 int err;
1762 int n = 0;
1763
35a7aa08 1764 if (attrs[XFRMA_MIGRATE] == NULL)
cf5cb79f 1765 return -EINVAL;
5c79de6e 1766
13c1d189
AE		 1767 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
1768
5424f32e 1769 err = copy_from_user_policy_type(&type, attrs);
5c79de6e
SS		 1770 if (err)
1771 return err;
1772
13c1d189 1773 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
5c79de6e
SS		 1774 if (err)
1775 return err;
1776
1777 if (!n)
1778 return 0;
1779
13c1d189 1780 xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp);
5c79de6e
SS		 1781
1782 return 0;
1783}
1784#else
1785static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1786 struct nlattr **attrs)
5c79de6e
SS		 1787{
1788 return -ENOPROTOOPT;
1789}
1790#endif
1791
1792#ifdef CONFIG_XFRM_MIGRATE
1793static int copy_to_user_migrate(struct xfrm_migrate *m, struct sk_buff *skb)
1794{
1795 struct xfrm_user_migrate um;
1796
1797 memset(&um, 0, sizeof(um));
1798 um.proto = m->proto;
1799 um.mode = m->mode;
1800 um.reqid = m->reqid;
1801 um.old_family = m->old_family;
1802 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
1803 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
1804 um.new_family = m->new_family;
1805 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
1806 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
1807
c0144bea 1808 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
5c79de6e
SS		 1809}
1810
13c1d189
AE		 1811static int copy_to_user_kmaddress(struct xfrm_kmaddress *k, struct sk_buff *skb)
1812{
1813 struct xfrm_user_kmaddress uk;
1814
1815 memset(&uk, 0, sizeof(uk));
1816 uk.family = k->family;
1817 uk.reserved = k->reserved;
1818 memcpy(&uk.local, &k->local, sizeof(uk.local));
a1caa322 1819 memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
13c1d189
AE		 1820
1821 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
1822}
1823
1824static inline size_t xfrm_migrate_msgsize(int num_migrate, int with_kma)
7deb2264
TG		 1825{
1826 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
13c1d189
AE		 1827 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
1828 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
1829 + userpolicy_type_attrsize();
7deb2264
TG		 1830}
1831
5c79de6e 1832static int build_migrate(struct sk_buff *skb, struct xfrm_migrate *m,
13c1d189
AE		 1833 int num_migrate, struct xfrm_kmaddress *k,
1834 struct xfrm_selector *sel, u8 dir, u8 type)
5c79de6e
SS		 1835{
1836 struct xfrm_migrate *mp;
1837 struct xfrm_userpolicy_id *pol_id;
1838 struct nlmsghdr *nlh;
5c79de6e
SS		 1839 int i;
1840
79b8b7f4
TG		 1841 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
1842 if (nlh == NULL)
1843 return -EMSGSIZE;
5c79de6e 1844
7b67c857 1845 pol_id = nlmsg_data(nlh);
5c79de6e
SS		 1846 /* copy data from selector, dir, and type to the pol_id */
1847 memset(pol_id, 0, sizeof(*pol_id));
1848 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
1849 pol_id->dir = dir;
1850
13c1d189
AE		 1851 if (k != NULL && (copy_to_user_kmaddress(k, skb) < 0))
1852 goto nlmsg_failure;
1853
5c79de6e
SS		 1854 if (copy_to_user_policy_type(type, skb) < 0)
1855 goto nlmsg_failure;
1856
1857 for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
1858 if (copy_to_user_migrate(mp, skb) < 0)
1859 goto nlmsg_failure;
1860 }
1861
9825069d 1862 return nlmsg_end(skb, nlh);
5c79de6e 1863nlmsg_failure:
9825069d
TG		 1864 nlmsg_cancel(skb, nlh);
1865 return -EMSGSIZE;
5c79de6e
SS		 1866}
1867
1868static int xfrm_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
13c1d189
AE		 1869 struct xfrm_migrate *m, int num_migrate,
1870 struct xfrm_kmaddress *k)
5c79de6e
SS		 1871{
1872 struct sk_buff *skb;
5c79de6e 1873
13c1d189 1874 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k), GFP_ATOMIC);
5c79de6e
SS		 1875 if (skb == NULL)
1876 return -ENOMEM;
1877
1878 /* build migrate */
13c1d189 1879 if (build_migrate(skb, m, num_migrate, k, sel, dir, type) < 0)
5c79de6e
SS		 1880 BUG();
1881
082a1ad5 1882 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_MIGRATE, GFP_ATOMIC);
5c79de6e
SS		 1883}
1884#else
1885static int xfrm_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
13c1d189
AE		 1886 struct xfrm_migrate *m, int num_migrate,
1887 struct xfrm_kmaddress *k)
5c79de6e
SS		 1888{
1889 return -ENOPROTOOPT;
1890}
1891#endif
d51d081d 1892
a7bd9a45 1893#define XMSGSIZE(type) sizeof(struct type)
492b558b
TG		 1894
1895static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
1896 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
1897 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
1898 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
1899 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
1900 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
1901 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
1902 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
980ebd25 1903 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
53bc6b4d 1904 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
492b558b
TG		 1905 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
1906 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
6c5c8ca7 1907 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
492b558b 1908 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
a7bd9a45 1909 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
d51d081d
JHS		 1910 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
1911 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
97a64b45 1912 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
5c79de6e 1913 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
a7bd9a45
TG		 1914 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32),
1915 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
1da177e4
LT		 1916};
1917
492b558b
TG		 1918#undef XMSGSIZE
1919
cf5cb79f 1920static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
1a6509d9 1921 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) },
cf5cb79f
TG		 1922 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) },
1923 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
1924 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) },
1925 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) },
1926 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) },
1927 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) },
1928 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
1929 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) },
1930 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 },
1931 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 },
1932 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) },
1933 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
1934 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
1935 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
13c1d189 1936 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) },
cf5cb79f
TG		 1937};
1938
1da177e4 1939static struct xfrm_link {
5424f32e 1940 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
1da177e4 1941 int (*dump)(struct sk_buff *, struct netlink_callback *);
4c563f76 1942 int (*done)(struct netlink_callback *);
492b558b
TG		 1943} xfrm_dispatch[XFRM_NR_MSGTYPES] = {
1944 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
1945 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
1946 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
4c563f76
TT		 1947 .dump = xfrm_dump_sa,
1948 .done = xfrm_dump_sa_done },
492b558b
TG		 1949 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
1950 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
1951 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
4c563f76
TT		 1952 .dump = xfrm_dump_policy,
1953 .done = xfrm_dump_policy_done },
492b558b 1954 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
980ebd25 1955 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
53bc6b4d 1956 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
492b558b
TG		 1957 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
1958 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
6c5c8ca7 1959 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
492b558b
TG		 1960 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
1961 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
d51d081d
JHS		 1962 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
1963 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
5c79de6e 1964 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
566ec034 1965 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo },
ecfd6b18 1966 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo },
1da177e4
LT		 1967};
1968
1d00a4eb 1969static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 1970{
35a7aa08 1971 struct nlattr *attrs[XFRMA_MAX+1];
1da177e4 1972 struct xfrm_link *link;
a7bd9a45 1973 int type, err;
1da177e4 1974
1da177e4 1975 type = nlh->nlmsg_type;
1da177e4 1976 if (type > XFRM_MSG_MAX)
1d00a4eb 1977 return -EINVAL;
1da177e4
LT		 1978
1979 type -= XFRM_MSG_BASE;
1980 link = &xfrm_dispatch[type];
1981
1982 /* All operations require privileges, even GET */
1d00a4eb
TG		 1983 if (security_netlink_recv(skb, CAP_NET_ADMIN))
1984 return -EPERM;
1da177e4 1985
492b558b
TG		 1986 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
1987 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
1988 (nlh->nlmsg_flags & NLM_F_DUMP)) {
1da177e4 1989 if (link->dump == NULL)
1d00a4eb 1990 return -EINVAL;
88fc2c84 1991
4c563f76 1992 return netlink_dump_start(xfrm_nl, skb, nlh, link->dump, link->done);
1da177e4
LT		 1993 }
1994
35a7aa08 1995 err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs, XFRMA_MAX,
cf5cb79f 1996 xfrma_policy);
a7bd9a45
TG		 1997 if (err < 0)
1998 return err;
1da177e4
LT		 1999
2000 if (link->doit == NULL)
1d00a4eb 2001 return -EINVAL;
1da177e4 2002
5424f32e 2003 return link->doit(skb, nlh, attrs);
1da177e4
LT		 2004}
2005
cd40b7d3 2006static void xfrm_netlink_rcv(struct sk_buff *skb)
1da177e4 2007{
cd40b7d3
DL		 2008 mutex_lock(&xfrm_cfg_mutex);
2009 netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
2010 mutex_unlock(&xfrm_cfg_mutex);
1da177e4
LT		 2011}
2012
7deb2264
TG		 2013static inline size_t xfrm_expire_msgsize(void)
2014{
2015 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire));
2016}
2017
d51d081d 2018static int build_expire(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c)
1da177e4
LT		 2019{
2020 struct xfrm_user_expire *ue;
2021 struct nlmsghdr *nlh;
1da177e4 2022
79b8b7f4
TG		 2023 nlh = nlmsg_put(skb, c->pid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
2024 if (nlh == NULL)
2025 return -EMSGSIZE;
1da177e4 2026
7b67c857 2027 ue = nlmsg_data(nlh);
1da177e4 2028 copy_to_user_state(x, &ue->state);
d51d081d 2029 ue->hard = (c->data.hard != 0) ? 1 : 0;
1da177e4 2030
9825069d 2031 return nlmsg_end(skb, nlh);
1da177e4
LT		 2032}
2033
26b15dad 2034static int xfrm_exp_state_notify(struct xfrm_state *x, struct km_event *c)
1da177e4
LT		 2035{
2036 struct sk_buff *skb;
2037
7deb2264 2038 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
1da177e4
LT		 2039 if (skb == NULL)
2040 return -ENOMEM;
2041
d51d081d 2042 if (build_expire(skb, x, c) < 0)
1da177e4
LT		 2043 BUG();
2044
082a1ad5 2045 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
1da177e4
LT		 2046}
2047
d51d081d
JHS		 2048static int xfrm_aevent_state_notify(struct xfrm_state *x, struct km_event *c)
2049{
2050 struct sk_buff *skb;
d51d081d 2051
7deb2264 2052 skb = nlmsg_new(xfrm_aevent_msgsize(), GFP_ATOMIC);
d51d081d
JHS		 2053 if (skb == NULL)
2054 return -ENOMEM;
2055
2056 if (build_aevent(skb, x, c) < 0)
2057 BUG();
2058
082a1ad5 2059 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_AEVENTS, GFP_ATOMIC);
d51d081d
JHS		 2060}
2061
26b15dad
JHS		 2062static int xfrm_notify_sa_flush(struct km_event *c)
2063{
2064 struct xfrm_usersa_flush *p;
2065 struct nlmsghdr *nlh;
2066 struct sk_buff *skb;
7deb2264 2067 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
26b15dad 2068
7deb2264 2069 skb = nlmsg_new(len, GFP_ATOMIC);
26b15dad
JHS		 2070 if (skb == NULL)
2071 return -ENOMEM;
26b15dad 2072
79b8b7f4
TG		 2073 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
2074 if (nlh == NULL) {
2075 kfree_skb(skb);
2076 return -EMSGSIZE;
2077 }
26b15dad 2078
7b67c857 2079 p = nlmsg_data(nlh);
bf08867f 2080 p->proto = c->data.proto;
26b15dad 2081
9825069d 2082 nlmsg_end(skb, nlh);
26b15dad 2083
082a1ad5 2084 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
26b15dad
JHS		 2085}
2086
7deb2264 2087static inline size_t xfrm_sa_len(struct xfrm_state *x)
26b15dad 2088{
7deb2264 2089 size_t l = 0;
1a6509d9
HX		 2090 if (x->aead)
2091 l += nla_total_size(aead_len(x->aead));
26b15dad 2092 if (x->aalg)
0f99be0d 2093 l += nla_total_size(xfrm_alg_len(x->aalg));
26b15dad 2094 if (x->ealg)
0f99be0d 2095 l += nla_total_size(xfrm_alg_len(x->ealg));
26b15dad 2096 if (x->calg)
7deb2264 2097 l += nla_total_size(sizeof(*x->calg));
26b15dad 2098 if (x->encap)
7deb2264 2099 l += nla_total_size(sizeof(*x->encap));
68325d3b
HX		 2100 if (x->security)
2101 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2102 x->security->ctx_len);
2103 if (x->coaddr)
2104 l += nla_total_size(sizeof(*x->coaddr));
2105
d26f3984
HX		 2106 /* Must count x->lastused as it may become non-zero behind our back. */
2107 l += nla_total_size(sizeof(u64));
26b15dad
JHS		 2108
2109 return l;
2110}
2111
2112static int xfrm_notify_sa(struct xfrm_state *x, struct km_event *c)
2113{
2114 struct xfrm_usersa_info *p;
0603eac0 2115 struct xfrm_usersa_id *id;
26b15dad
JHS		 2116 struct nlmsghdr *nlh;
2117 struct sk_buff *skb;
26b15dad 2118 int len = xfrm_sa_len(x);
0603eac0
HX		 2119 int headlen;
2120
2121 headlen = sizeof(*p);
2122 if (c->event == XFRM_MSG_DELSA) {
7deb2264 2123 len += nla_total_size(headlen);
0603eac0
HX		 2124 headlen = sizeof(*id);
2125 }
7deb2264 2126 len += NLMSG_ALIGN(headlen);
26b15dad 2127
7deb2264 2128 skb = nlmsg_new(len, GFP_ATOMIC);
26b15dad
JHS		 2129 if (skb == NULL)
2130 return -ENOMEM;
26b15dad 2131
79b8b7f4
TG		 2132 nlh = nlmsg_put(skb, c->pid, c->seq, c->event, headlen, 0);
2133 if (nlh == NULL)
c0144bea 2134 goto nla_put_failure;
26b15dad 2135
7b67c857 2136 p = nlmsg_data(nlh);
0603eac0 2137 if (c->event == XFRM_MSG_DELSA) {
c0144bea
TG		 2138 struct nlattr *attr;
2139
7b67c857 2140 id = nlmsg_data(nlh);
0603eac0
HX		 2141 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2142 id->spi = x->id.spi;
2143 id->family = x->props.family;
2144 id->proto = x->id.proto;
2145
c0144bea
TG		 2146 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
2147 if (attr == NULL)
2148 goto nla_put_failure;
2149
2150 p = nla_data(attr);
0603eac0
HX		 2151 }
2152
68325d3b
HX		 2153 if (copy_to_user_state_extra(x, p, skb))
2154 goto nla_put_failure;
26b15dad 2155
9825069d 2156 nlmsg_end(skb, nlh);
26b15dad 2157
082a1ad5 2158 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
26b15dad 2159
c0144bea 2160nla_put_failure:
68325d3b
HX		 2161 /* Somebody screwed up with xfrm_sa_len! */
2162 WARN_ON(1);
26b15dad
JHS		 2163 kfree_skb(skb);
2164 return -1;
2165}
2166
2167static int xfrm_send_state_notify(struct xfrm_state *x, struct km_event *c)
2168{
2169
2170 switch (c->event) {
f60f6b8f 2171 case XFRM_MSG_EXPIRE:
26b15dad 2172 return xfrm_exp_state_notify(x, c);
d51d081d
JHS		 2173 case XFRM_MSG_NEWAE:
2174 return xfrm_aevent_state_notify(x, c);
f60f6b8f
HX		 2175 case XFRM_MSG_DELSA:
2176 case XFRM_MSG_UPDSA:
2177 case XFRM_MSG_NEWSA:
26b15dad 2178 return xfrm_notify_sa(x, c);
f60f6b8f 2179 case XFRM_MSG_FLUSHSA:
26b15dad
JHS		 2180 return xfrm_notify_sa_flush(c);
2181 default:
2182 printk("xfrm_user: Unknown SA event %d\n", c->event);
2183 break;
2184 }
2185
2186 return 0;
2187
2188}
2189
7deb2264
TG		 2190static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x,
2191 struct xfrm_policy *xp)
2192{
2193 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
2194 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2195 + nla_total_size(xfrm_user_sec_ctx_size(x->security))
2196 + userpolicy_type_attrsize();
2197}
2198
1da177e4
LT		 2199static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
2200 struct xfrm_tmpl *xt, struct xfrm_policy *xp,
2201 int dir)
2202{
2203 struct xfrm_user_acquire *ua;
2204 struct nlmsghdr *nlh;
1da177e4
LT		 2205 __u32 seq = xfrm_get_acqseq();
2206
79b8b7f4
TG		 2207 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
2208 if (nlh == NULL)
2209 return -EMSGSIZE;
1da177e4 2210
7b67c857 2211 ua = nlmsg_data(nlh);
1da177e4
LT		 2212 memcpy(&ua->id, &x->id, sizeof(ua->id));
2213 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2214 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
2215 copy_to_user_policy(xp, &ua->policy, dir);
2216 ua->aalgos = xt->aalgos;
2217 ua->ealgos = xt->ealgos;
2218 ua->calgos = xt->calgos;
2219 ua->seq = x->km.seq = seq;
2220
2221 if (copy_to_user_tmpl(xp, skb) < 0)
2222 goto nlmsg_failure;
0d681623 2223 if (copy_to_user_state_sec_ctx(x, skb))
df71837d 2224 goto nlmsg_failure;
1459bb36 2225 if (copy_to_user_policy_type(xp->type, skb) < 0)
f7b6983f 2226 goto nlmsg_failure;
1da177e4 2227
9825069d 2228 return nlmsg_end(skb, nlh);
1da177e4
LT		 2229
2230nlmsg_failure:
9825069d
TG		 2231 nlmsg_cancel(skb, nlh);
2232 return -EMSGSIZE;
1da177e4
LT		 2233}
2234
2235static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
2236 struct xfrm_policy *xp, int dir)
2237{
2238 struct sk_buff *skb;
1da177e4 2239
7deb2264 2240 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
1da177e4
LT		 2241 if (skb == NULL)
2242 return -ENOMEM;
2243
2244 if (build_acquire(skb, x, xt, xp, dir) < 0)
2245 BUG();
2246
082a1ad5 2247 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_ACQUIRE, GFP_ATOMIC);
1da177e4
LT		 2248}
2249
2250/* User gives us xfrm_user_policy_info followed by an array of 0
2251 * or more templates.
2252 */
cb969f07 2253static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
1da177e4
LT		 2254 u8 *data, int len, int *dir)
2255{
2256 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2257 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2258 struct xfrm_policy *xp;
2259 int nr;
2260
cb969f07 2261 switch (sk->sk_family) {
1da177e4
LT		 2262 case AF_INET:
2263 if (opt != IP_XFRM_POLICY) {
2264 *dir = -EOPNOTSUPP;
2265 return NULL;
2266 }
2267 break;
2268#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2269 case AF_INET6:
2270 if (opt != IPV6_XFRM_POLICY) {
2271 *dir = -EOPNOTSUPP;
2272 return NULL;
2273 }
2274 break;
2275#endif
2276 default:
2277 *dir = -EINVAL;
2278 return NULL;
2279 }
2280
2281 *dir = -EINVAL;
2282
2283 if (len < sizeof(*p) ||
2284 verify_newpolicy_info(p))
2285 return NULL;
2286
2287 nr = ((len - sizeof(*p)) / sizeof(*ut));
b4ad86bf 2288 if (validate_tmpl(nr, ut, p->sel.family))
1da177e4
LT		 2289 return NULL;
2290
a4f1bac6
HX		 2291 if (p->dir > XFRM_POLICY_OUT)
2292 return NULL;
2293
0331b1f3 2294 xp = xfrm_policy_alloc(&init_net, GFP_KERNEL);
1da177e4
LT		 2295 if (xp == NULL) {
2296 *dir = -ENOBUFS;
2297 return NULL;
2298 }
2299
2300 copy_from_user_policy(xp, p);
f7b6983f 2301 xp->type = XFRM_POLICY_TYPE_MAIN;
1da177e4
LT		 2302 copy_templates(xp, ut, nr);
2303
2304 *dir = p->dir;
2305
2306 return xp;
2307}
2308
7deb2264
TG		 2309static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp)
2310{
2311 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
2312 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2313 + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
2314 + userpolicy_type_attrsize();
2315}
2316
1da177e4 2317static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
d51d081d 2318 int dir, struct km_event *c)
1da177e4
LT		 2319{
2320 struct xfrm_user_polexpire *upe;
2321 struct nlmsghdr *nlh;
d51d081d 2322 int hard = c->data.hard;
1da177e4 2323
79b8b7f4
TG		 2324 nlh = nlmsg_put(skb, c->pid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
2325 if (nlh == NULL)
2326 return -EMSGSIZE;
1da177e4 2327
7b67c857 2328 upe = nlmsg_data(nlh);
1da177e4
LT		 2329 copy_to_user_policy(xp, &upe->pol, dir);
2330 if (copy_to_user_tmpl(xp, skb) < 0)
2331 goto nlmsg_failure;
df71837d
TJ		 2332 if (copy_to_user_sec_ctx(xp, skb))
2333 goto nlmsg_failure;
1459bb36 2334 if (copy_to_user_policy_type(xp->type, skb) < 0)
f7b6983f 2335 goto nlmsg_failure;
1da177e4
LT		 2336 upe->hard = !!hard;
2337
9825069d 2338 return nlmsg_end(skb, nlh);
1da177e4
LT		 2339
2340nlmsg_failure:
9825069d
TG		 2341 nlmsg_cancel(skb, nlh);
2342 return -EMSGSIZE;
1da177e4
LT		 2343}
2344
26b15dad 2345static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
1da177e4
LT		 2346{
2347 struct sk_buff *skb;
1da177e4 2348
7deb2264 2349 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
1da177e4
LT		 2350 if (skb == NULL)
2351 return -ENOMEM;
2352
d51d081d 2353 if (build_polexpire(skb, xp, dir, c) < 0)
1da177e4
LT		 2354 BUG();
2355
082a1ad5 2356 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
1da177e4
LT		 2357}
2358
26b15dad
JHS		 2359static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c)
2360{
2361 struct xfrm_userpolicy_info *p;
0603eac0 2362 struct xfrm_userpolicy_id *id;
26b15dad
JHS		 2363 struct nlmsghdr *nlh;
2364 struct sk_buff *skb;
7deb2264 2365 int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
0603eac0
HX		 2366 int headlen;
2367
2368 headlen = sizeof(*p);
2369 if (c->event == XFRM_MSG_DELPOLICY) {
7deb2264 2370 len += nla_total_size(headlen);
0603eac0
HX		 2371 headlen = sizeof(*id);
2372 }
cfbfd45a 2373 len += userpolicy_type_attrsize();
7deb2264 2374 len += NLMSG_ALIGN(headlen);
26b15dad 2375
7deb2264 2376 skb = nlmsg_new(len, GFP_ATOMIC);
26b15dad
JHS		 2377 if (skb == NULL)
2378 return -ENOMEM;
26b15dad 2379
79b8b7f4
TG		 2380 nlh = nlmsg_put(skb, c->pid, c->seq, c->event, headlen, 0);
2381 if (nlh == NULL)
2382 goto nlmsg_failure;
26b15dad 2383
7b67c857 2384 p = nlmsg_data(nlh);
0603eac0 2385 if (c->event == XFRM_MSG_DELPOLICY) {
c0144bea
TG		 2386 struct nlattr *attr;
2387
7b67c857 2388 id = nlmsg_data(nlh);
0603eac0
HX		 2389 memset(id, 0, sizeof(*id));
2390 id->dir = dir;
2391 if (c->data.byid)
2392 id->index = xp->index;
2393 else
2394 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
2395
c0144bea
TG		 2396 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
2397 if (attr == NULL)
2398 goto nlmsg_failure;
2399
2400 p = nla_data(attr);
0603eac0 2401 }
26b15dad 2402
26b15dad
JHS		 2403 copy_to_user_policy(xp, p, dir);
2404 if (copy_to_user_tmpl(xp, skb) < 0)
2405 goto nlmsg_failure;
1459bb36 2406 if (copy_to_user_policy_type(xp->type, skb) < 0)
f7b6983f 2407 goto nlmsg_failure;
26b15dad 2408
9825069d 2409 nlmsg_end(skb, nlh);
26b15dad 2410
082a1ad5 2411 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
26b15dad
JHS		 2412
2413nlmsg_failure:
2414 kfree_skb(skb);
2415 return -1;
2416}
2417
2418static int xfrm_notify_policy_flush(struct km_event *c)
2419{
2420 struct nlmsghdr *nlh;
2421 struct sk_buff *skb;
26b15dad 2422
7deb2264 2423 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
26b15dad
JHS		 2424 if (skb == NULL)
2425 return -ENOMEM;
26b15dad 2426
79b8b7f4
TG		 2427 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
2428 if (nlh == NULL)
2429 goto nlmsg_failure;
0c51f53c
JHS		 2430 if (copy_to_user_policy_type(c->data.type, skb) < 0)
2431 goto nlmsg_failure;
26b15dad 2432
9825069d 2433 nlmsg_end(skb, nlh);
26b15dad 2434
082a1ad5 2435 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
26b15dad
JHS		 2436
2437nlmsg_failure:
2438 kfree_skb(skb);
2439 return -1;
2440}
2441
2442static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
2443{
2444
2445 switch (c->event) {
f60f6b8f
HX		 2446 case XFRM_MSG_NEWPOLICY:
2447 case XFRM_MSG_UPDPOLICY:
2448 case XFRM_MSG_DELPOLICY:
26b15dad 2449 return xfrm_notify_policy(xp, dir, c);
f60f6b8f 2450 case XFRM_MSG_FLUSHPOLICY:
26b15dad 2451 return xfrm_notify_policy_flush(c);
f60f6b8f 2452 case XFRM_MSG_POLEXPIRE:
26b15dad
JHS		 2453 return xfrm_exp_policy_notify(xp, dir, c);
2454 default:
2455 printk("xfrm_user: Unknown Policy event %d\n", c->event);
2456 }
2457
2458 return 0;
2459
2460}
2461
7deb2264
TG		 2462static inline size_t xfrm_report_msgsize(void)
2463{
2464 return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
2465}
2466
97a64b45
MN		 2467static int build_report(struct sk_buff *skb, u8 proto,
2468 struct xfrm_selector *sel, xfrm_address_t *addr)
2469{
2470 struct xfrm_user_report *ur;
2471 struct nlmsghdr *nlh;
97a64b45 2472
79b8b7f4
TG		 2473 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
2474 if (nlh == NULL)
2475 return -EMSGSIZE;
97a64b45 2476
7b67c857 2477 ur = nlmsg_data(nlh);
97a64b45
MN		 2478 ur->proto = proto;
2479 memcpy(&ur->sel, sel, sizeof(ur->sel));
2480
2481 if (addr)
c0144bea 2482 NLA_PUT(skb, XFRMA_COADDR, sizeof(*addr), addr);
97a64b45 2483
9825069d 2484 return nlmsg_end(skb, nlh);
97a64b45 2485
c0144bea 2486nla_put_failure:
9825069d
TG		 2487 nlmsg_cancel(skb, nlh);
2488 return -EMSGSIZE;
97a64b45
MN		 2489}
2490
2491static int xfrm_send_report(u8 proto, struct xfrm_selector *sel,
2492 xfrm_address_t *addr)
2493{
2494 struct sk_buff *skb;
97a64b45 2495
7deb2264 2496 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
97a64b45
MN		 2497 if (skb == NULL)
2498 return -ENOMEM;
2499
2500 if (build_report(skb, proto, sel, addr) < 0)
2501 BUG();
2502
082a1ad5 2503 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_REPORT, GFP_ATOMIC);
97a64b45
MN		 2504}
2505
3a2dfbe8
MW		 2506static inline size_t xfrm_mapping_msgsize(void)
2507{
2508 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
2509}
2510
2511static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
2512 xfrm_address_t *new_saddr, __be16 new_sport)
2513{
2514 struct xfrm_user_mapping *um;
2515 struct nlmsghdr *nlh;
2516
2517 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
2518 if (nlh == NULL)
2519 return -EMSGSIZE;
2520
2521 um = nlmsg_data(nlh);
2522
2523 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
2524 um->id.spi = x->id.spi;
2525 um->id.family = x->props.family;
2526 um->id.proto = x->id.proto;
2527 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
2528 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
2529 um->new_sport = new_sport;
2530 um->old_sport = x->encap->encap_sport;
2531 um->reqid = x->props.reqid;
2532
2533 return nlmsg_end(skb, nlh);
2534}
2535
2536static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
2537 __be16 sport)
2538{
2539 struct sk_buff *skb;
2540
2541 if (x->id.proto != IPPROTO_ESP)
2542 return -EINVAL;
2543
2544 if (!x->encap)
2545 return -EINVAL;
2546
2547 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
2548 if (skb == NULL)
2549 return -ENOMEM;
2550
2551 if (build_mapping(skb, x, ipaddr, sport) < 0)
2552 BUG();
2553
2554 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_MAPPING, GFP_ATOMIC);
2555}
2556
1da177e4
LT		 2557static struct xfrm_mgr netlink_mgr = {
2558 .id = "netlink",
2559 .notify = xfrm_send_state_notify,
2560 .acquire = xfrm_send_acquire,
2561 .compile_policy = xfrm_compile_policy,
2562 .notify_policy = xfrm_send_policy_notify,
97a64b45 2563 .report = xfrm_send_report,
5c79de6e 2564 .migrate = xfrm_send_migrate,
3a2dfbe8 2565 .new_mapping = xfrm_send_mapping,
1da177e4
LT		 2566};
2567
2568static int __init xfrm_user_init(void)
2569{
be33690d
PM		 2570 struct sock *nlsk;
2571
654b32c6 2572 printk(KERN_INFO "Initializing XFRM netlink socket\n");
1da177e4 2573
b4b51029 2574 nlsk = netlink_kernel_create(&init_net, NETLINK_XFRM, XFRMNLGRP_MAX,
af65bdfc 2575 xfrm_netlink_rcv, NULL, THIS_MODULE);
be33690d 2576 if (nlsk == NULL)
1da177e4 2577 return -ENOMEM;
be33690d 2578 rcu_assign_pointer(xfrm_nl, nlsk);
1da177e4
LT		 2579
2580 xfrm_register_km(&netlink_mgr);
2581
2582 return 0;
2583}
2584
2585static void __exit xfrm_user_exit(void)
2586{
be33690d
PM		 2587 struct sock *nlsk = xfrm_nl;
2588
1da177e4 2589 xfrm_unregister_km(&netlink_mgr);
be33690d
PM		 2590 rcu_assign_pointer(xfrm_nl, NULL);
2591 synchronize_rcu();
b7c6ba6e 2592 netlink_kernel_release(nlsk);
1da177e4
LT		 2593}
2594
2595module_init(xfrm_user_init);
2596module_exit(xfrm_user_exit);
2597MODULE_LICENSE("GPL");
4fdb3bb7 2598MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
f8cd5488 2599
Linux 6.x block layer and io_uring tree(s)