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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 | |
10 | * | |
11 | */ | |
12 | ||
13 | #include <linux/module.h> | |
14 | #include <linux/kernel.h> | |
15 | #include <linux/types.h> | |
16 | #include <linux/slab.h> | |
17 | #include <linux/socket.h> | |
18 | #include <linux/string.h> | |
19 | #include <linux/net.h> | |
20 | #include <linux/skbuff.h> | |
21 | #include <linux/netlink.h> | |
22 | #include <linux/rtnetlink.h> | |
23 | #include <linux/pfkeyv2.h> | |
24 | #include <linux/ipsec.h> | |
25 | #include <linux/init.h> | |
26 | #include <linux/security.h> | |
27 | #include <net/sock.h> | |
28 | #include <net/xfrm.h> | |
29 | #include <asm/uaccess.h> | |
30 | ||
31 | static struct sock *xfrm_nl; | |
32 | ||
33 | static int verify_one_alg(struct rtattr **xfrma, enum xfrm_attr_type_t type) | |
34 | { | |
35 | struct rtattr *rt = xfrma[type - 1]; | |
36 | struct xfrm_algo *algp; | |
37 | ||
38 | if (!rt) | |
39 | return 0; | |
40 | ||
41 | if ((rt->rta_len - sizeof(*rt)) < sizeof(*algp)) | |
42 | return -EINVAL; | |
43 | ||
44 | algp = RTA_DATA(rt); | |
45 | switch (type) { | |
46 | case XFRMA_ALG_AUTH: | |
47 | if (!algp->alg_key_len && | |
48 | strcmp(algp->alg_name, "digest_null") != 0) | |
49 | return -EINVAL; | |
50 | break; | |
51 | ||
52 | case XFRMA_ALG_CRYPT: | |
53 | if (!algp->alg_key_len && | |
54 | strcmp(algp->alg_name, "cipher_null") != 0) | |
55 | return -EINVAL; | |
56 | break; | |
57 | ||
58 | case XFRMA_ALG_COMP: | |
59 | /* Zero length keys are legal. */ | |
60 | break; | |
61 | ||
62 | default: | |
63 | return -EINVAL; | |
64 | }; | |
65 | ||
66 | algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0'; | |
67 | return 0; | |
68 | } | |
69 | ||
70 | static int verify_encap_tmpl(struct rtattr **xfrma) | |
71 | { | |
72 | struct rtattr *rt = xfrma[XFRMA_ENCAP - 1]; | |
73 | struct xfrm_encap_tmpl *encap; | |
74 | ||
75 | if (!rt) | |
76 | return 0; | |
77 | ||
78 | if ((rt->rta_len - sizeof(*rt)) < sizeof(*encap)) | |
79 | return -EINVAL; | |
80 | ||
81 | return 0; | |
82 | } | |
83 | ||
84 | static int verify_newsa_info(struct xfrm_usersa_info *p, | |
85 | struct rtattr **xfrma) | |
86 | { | |
87 | int err; | |
88 | ||
89 | err = -EINVAL; | |
90 | switch (p->family) { | |
91 | case AF_INET: | |
92 | break; | |
93 | ||
94 | case AF_INET6: | |
95 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
96 | break; | |
97 | #else | |
98 | err = -EAFNOSUPPORT; | |
99 | goto out; | |
100 | #endif | |
101 | ||
102 | default: | |
103 | goto out; | |
104 | }; | |
105 | ||
106 | err = -EINVAL; | |
107 | switch (p->id.proto) { | |
108 | case IPPROTO_AH: | |
109 | if (!xfrma[XFRMA_ALG_AUTH-1] || | |
110 | xfrma[XFRMA_ALG_CRYPT-1] || | |
111 | xfrma[XFRMA_ALG_COMP-1]) | |
112 | goto out; | |
113 | break; | |
114 | ||
115 | case IPPROTO_ESP: | |
116 | if ((!xfrma[XFRMA_ALG_AUTH-1] && | |
117 | !xfrma[XFRMA_ALG_CRYPT-1]) || | |
118 | xfrma[XFRMA_ALG_COMP-1]) | |
119 | goto out; | |
120 | break; | |
121 | ||
122 | case IPPROTO_COMP: | |
123 | if (!xfrma[XFRMA_ALG_COMP-1] || | |
124 | xfrma[XFRMA_ALG_AUTH-1] || | |
125 | xfrma[XFRMA_ALG_CRYPT-1]) | |
126 | goto out; | |
127 | break; | |
128 | ||
129 | default: | |
130 | goto out; | |
131 | }; | |
132 | ||
133 | if ((err = verify_one_alg(xfrma, XFRMA_ALG_AUTH))) | |
134 | goto out; | |
135 | if ((err = verify_one_alg(xfrma, XFRMA_ALG_CRYPT))) | |
136 | goto out; | |
137 | if ((err = verify_one_alg(xfrma, XFRMA_ALG_COMP))) | |
138 | goto out; | |
139 | if ((err = verify_encap_tmpl(xfrma))) | |
140 | goto out; | |
141 | ||
142 | err = -EINVAL; | |
143 | switch (p->mode) { | |
144 | case 0: | |
145 | case 1: | |
146 | break; | |
147 | ||
148 | default: | |
149 | goto out; | |
150 | }; | |
151 | ||
152 | err = 0; | |
153 | ||
154 | out: | |
155 | return err; | |
156 | } | |
157 | ||
158 | static int attach_one_algo(struct xfrm_algo **algpp, u8 *props, | |
159 | struct xfrm_algo_desc *(*get_byname)(char *, int), | |
160 | struct rtattr *u_arg) | |
161 | { | |
162 | struct rtattr *rta = u_arg; | |
163 | struct xfrm_algo *p, *ualg; | |
164 | struct xfrm_algo_desc *algo; | |
165 | ||
166 | if (!rta) | |
167 | return 0; | |
168 | ||
169 | ualg = RTA_DATA(rta); | |
170 | ||
171 | algo = get_byname(ualg->alg_name, 1); | |
172 | if (!algo) | |
173 | return -ENOSYS; | |
174 | *props = algo->desc.sadb_alg_id; | |
175 | ||
176 | p = kmalloc(sizeof(*ualg) + ualg->alg_key_len, GFP_KERNEL); | |
177 | if (!p) | |
178 | return -ENOMEM; | |
179 | ||
180 | memcpy(p, ualg, sizeof(*ualg) + ualg->alg_key_len); | |
181 | *algpp = p; | |
182 | return 0; | |
183 | } | |
184 | ||
185 | static int attach_encap_tmpl(struct xfrm_encap_tmpl **encapp, struct rtattr *u_arg) | |
186 | { | |
187 | struct rtattr *rta = u_arg; | |
188 | struct xfrm_encap_tmpl *p, *uencap; | |
189 | ||
190 | if (!rta) | |
191 | return 0; | |
192 | ||
193 | uencap = RTA_DATA(rta); | |
194 | p = kmalloc(sizeof(*p), GFP_KERNEL); | |
195 | if (!p) | |
196 | return -ENOMEM; | |
197 | ||
198 | memcpy(p, uencap, sizeof(*p)); | |
199 | *encapp = p; | |
200 | return 0; | |
201 | } | |
202 | ||
203 | static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p) | |
204 | { | |
205 | memcpy(&x->id, &p->id, sizeof(x->id)); | |
206 | memcpy(&x->sel, &p->sel, sizeof(x->sel)); | |
207 | memcpy(&x->lft, &p->lft, sizeof(x->lft)); | |
208 | x->props.mode = p->mode; | |
209 | x->props.replay_window = p->replay_window; | |
210 | x->props.reqid = p->reqid; | |
211 | x->props.family = p->family; | |
212 | x->props.saddr = p->saddr; | |
213 | x->props.flags = p->flags; | |
214 | } | |
215 | ||
216 | static struct xfrm_state *xfrm_state_construct(struct xfrm_usersa_info *p, | |
217 | struct rtattr **xfrma, | |
218 | int *errp) | |
219 | { | |
220 | struct xfrm_state *x = xfrm_state_alloc(); | |
221 | int err = -ENOMEM; | |
222 | ||
223 | if (!x) | |
224 | goto error_no_put; | |
225 | ||
226 | copy_from_user_state(x, p); | |
227 | ||
228 | if ((err = attach_one_algo(&x->aalg, &x->props.aalgo, | |
229 | xfrm_aalg_get_byname, | |
230 | xfrma[XFRMA_ALG_AUTH-1]))) | |
231 | goto error; | |
232 | if ((err = attach_one_algo(&x->ealg, &x->props.ealgo, | |
233 | xfrm_ealg_get_byname, | |
234 | xfrma[XFRMA_ALG_CRYPT-1]))) | |
235 | goto error; | |
236 | if ((err = attach_one_algo(&x->calg, &x->props.calgo, | |
237 | xfrm_calg_get_byname, | |
238 | xfrma[XFRMA_ALG_COMP-1]))) | |
239 | goto error; | |
240 | if ((err = attach_encap_tmpl(&x->encap, xfrma[XFRMA_ENCAP-1]))) | |
241 | goto error; | |
242 | ||
243 | err = -ENOENT; | |
244 | x->type = xfrm_get_type(x->id.proto, x->props.family); | |
245 | if (x->type == NULL) | |
246 | goto error; | |
247 | ||
248 | err = x->type->init_state(x, NULL); | |
249 | if (err) | |
250 | goto error; | |
251 | ||
252 | x->curlft.add_time = (unsigned long) xtime.tv_sec; | |
253 | x->km.state = XFRM_STATE_VALID; | |
254 | x->km.seq = p->seq; | |
255 | ||
256 | return x; | |
257 | ||
258 | error: | |
259 | x->km.state = XFRM_STATE_DEAD; | |
260 | xfrm_state_put(x); | |
261 | error_no_put: | |
262 | *errp = err; | |
263 | return NULL; | |
264 | } | |
265 | ||
266 | static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma) | |
267 | { | |
268 | struct xfrm_usersa_info *p = NLMSG_DATA(nlh); | |
269 | struct xfrm_state *x; | |
270 | int err; | |
271 | ||
272 | err = verify_newsa_info(p, (struct rtattr **) xfrma); | |
273 | if (err) | |
274 | return err; | |
275 | ||
276 | x = xfrm_state_construct(p, (struct rtattr **) xfrma, &err); | |
277 | if (!x) | |
278 | return err; | |
279 | ||
280 | if (nlh->nlmsg_type == XFRM_MSG_NEWSA) | |
281 | err = xfrm_state_add(x); | |
282 | else | |
283 | err = xfrm_state_update(x); | |
284 | ||
285 | if (err < 0) { | |
286 | x->km.state = XFRM_STATE_DEAD; | |
287 | xfrm_state_put(x); | |
288 | } | |
289 | ||
290 | return err; | |
291 | } | |
292 | ||
293 | static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma) | |
294 | { | |
295 | struct xfrm_state *x; | |
296 | struct xfrm_usersa_id *p = NLMSG_DATA(nlh); | |
297 | ||
298 | x = xfrm_state_lookup(&p->daddr, p->spi, p->proto, p->family); | |
299 | if (x == NULL) | |
300 | return -ESRCH; | |
301 | ||
302 | if (xfrm_state_kern(x)) { | |
303 | xfrm_state_put(x); | |
304 | return -EPERM; | |
305 | } | |
306 | ||
307 | xfrm_state_delete(x); | |
308 | xfrm_state_put(x); | |
309 | ||
310 | return 0; | |
311 | } | |
312 | ||
313 | static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p) | |
314 | { | |
315 | memcpy(&p->id, &x->id, sizeof(p->id)); | |
316 | memcpy(&p->sel, &x->sel, sizeof(p->sel)); | |
317 | memcpy(&p->lft, &x->lft, sizeof(p->lft)); | |
318 | memcpy(&p->curlft, &x->curlft, sizeof(p->curlft)); | |
319 | memcpy(&p->stats, &x->stats, sizeof(p->stats)); | |
320 | p->saddr = x->props.saddr; | |
321 | p->mode = x->props.mode; | |
322 | p->replay_window = x->props.replay_window; | |
323 | p->reqid = x->props.reqid; | |
324 | p->family = x->props.family; | |
325 | p->flags = x->props.flags; | |
326 | p->seq = x->km.seq; | |
327 | } | |
328 | ||
329 | struct xfrm_dump_info { | |
330 | struct sk_buff *in_skb; | |
331 | struct sk_buff *out_skb; | |
332 | u32 nlmsg_seq; | |
333 | u16 nlmsg_flags; | |
334 | int start_idx; | |
335 | int this_idx; | |
336 | }; | |
337 | ||
338 | static int dump_one_state(struct xfrm_state *x, int count, void *ptr) | |
339 | { | |
340 | struct xfrm_dump_info *sp = ptr; | |
341 | struct sk_buff *in_skb = sp->in_skb; | |
342 | struct sk_buff *skb = sp->out_skb; | |
343 | struct xfrm_usersa_info *p; | |
344 | struct nlmsghdr *nlh; | |
345 | unsigned char *b = skb->tail; | |
346 | ||
347 | if (sp->this_idx < sp->start_idx) | |
348 | goto out; | |
349 | ||
350 | nlh = NLMSG_PUT(skb, NETLINK_CB(in_skb).pid, | |
351 | sp->nlmsg_seq, | |
352 | XFRM_MSG_NEWSA, sizeof(*p)); | |
353 | nlh->nlmsg_flags = sp->nlmsg_flags; | |
354 | ||
355 | p = NLMSG_DATA(nlh); | |
356 | copy_to_user_state(x, p); | |
357 | ||
358 | if (x->aalg) | |
359 | RTA_PUT(skb, XFRMA_ALG_AUTH, | |
360 | sizeof(*(x->aalg))+(x->aalg->alg_key_len+7)/8, x->aalg); | |
361 | if (x->ealg) | |
362 | RTA_PUT(skb, XFRMA_ALG_CRYPT, | |
363 | sizeof(*(x->ealg))+(x->ealg->alg_key_len+7)/8, x->ealg); | |
364 | if (x->calg) | |
365 | RTA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg); | |
366 | ||
367 | if (x->encap) | |
368 | RTA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap); | |
369 | ||
370 | nlh->nlmsg_len = skb->tail - b; | |
371 | out: | |
372 | sp->this_idx++; | |
373 | return 0; | |
374 | ||
375 | nlmsg_failure: | |
376 | rtattr_failure: | |
377 | skb_trim(skb, b - skb->data); | |
378 | return -1; | |
379 | } | |
380 | ||
381 | static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb) | |
382 | { | |
383 | struct xfrm_dump_info info; | |
384 | ||
385 | info.in_skb = cb->skb; | |
386 | info.out_skb = skb; | |
387 | info.nlmsg_seq = cb->nlh->nlmsg_seq; | |
388 | info.nlmsg_flags = NLM_F_MULTI; | |
389 | info.this_idx = 0; | |
390 | info.start_idx = cb->args[0]; | |
391 | (void) xfrm_state_walk(IPSEC_PROTO_ANY, dump_one_state, &info); | |
392 | cb->args[0] = info.this_idx; | |
393 | ||
394 | return skb->len; | |
395 | } | |
396 | ||
397 | static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb, | |
398 | struct xfrm_state *x, u32 seq) | |
399 | { | |
400 | struct xfrm_dump_info info; | |
401 | struct sk_buff *skb; | |
402 | ||
403 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC); | |
404 | if (!skb) | |
405 | return ERR_PTR(-ENOMEM); | |
406 | ||
407 | NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid; | |
408 | info.in_skb = in_skb; | |
409 | info.out_skb = skb; | |
410 | info.nlmsg_seq = seq; | |
411 | info.nlmsg_flags = 0; | |
412 | info.this_idx = info.start_idx = 0; | |
413 | ||
414 | if (dump_one_state(x, 0, &info)) { | |
415 | kfree_skb(skb); | |
416 | return NULL; | |
417 | } | |
418 | ||
419 | return skb; | |
420 | } | |
421 | ||
422 | static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma) | |
423 | { | |
424 | struct xfrm_usersa_id *p = NLMSG_DATA(nlh); | |
425 | struct xfrm_state *x; | |
426 | struct sk_buff *resp_skb; | |
427 | int err; | |
428 | ||
429 | x = xfrm_state_lookup(&p->daddr, p->spi, p->proto, p->family); | |
430 | err = -ESRCH; | |
431 | if (x == NULL) | |
432 | goto out_noput; | |
433 | ||
434 | resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); | |
435 | if (IS_ERR(resp_skb)) { | |
436 | err = PTR_ERR(resp_skb); | |
437 | } else { | |
438 | err = netlink_unicast(xfrm_nl, resp_skb, | |
439 | NETLINK_CB(skb).pid, MSG_DONTWAIT); | |
440 | } | |
441 | xfrm_state_put(x); | |
442 | out_noput: | |
443 | return err; | |
444 | } | |
445 | ||
446 | static int verify_userspi_info(struct xfrm_userspi_info *p) | |
447 | { | |
448 | switch (p->info.id.proto) { | |
449 | case IPPROTO_AH: | |
450 | case IPPROTO_ESP: | |
451 | break; | |
452 | ||
453 | case IPPROTO_COMP: | |
454 | /* IPCOMP spi is 16-bits. */ | |
455 | if (p->max >= 0x10000) | |
456 | return -EINVAL; | |
457 | break; | |
458 | ||
459 | default: | |
460 | return -EINVAL; | |
461 | }; | |
462 | ||
463 | if (p->min > p->max) | |
464 | return -EINVAL; | |
465 | ||
466 | return 0; | |
467 | } | |
468 | ||
469 | static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma) | |
470 | { | |
471 | struct xfrm_state *x; | |
472 | struct xfrm_userspi_info *p; | |
473 | struct sk_buff *resp_skb; | |
474 | xfrm_address_t *daddr; | |
475 | int family; | |
476 | int err; | |
477 | ||
478 | p = NLMSG_DATA(nlh); | |
479 | err = verify_userspi_info(p); | |
480 | if (err) | |
481 | goto out_noput; | |
482 | ||
483 | family = p->info.family; | |
484 | daddr = &p->info.id.daddr; | |
485 | ||
486 | x = NULL; | |
487 | if (p->info.seq) { | |
488 | x = xfrm_find_acq_byseq(p->info.seq); | |
489 | if (x && xfrm_addr_cmp(&x->id.daddr, daddr, family)) { | |
490 | xfrm_state_put(x); | |
491 | x = NULL; | |
492 | } | |
493 | } | |
494 | ||
495 | if (!x) | |
496 | x = xfrm_find_acq(p->info.mode, p->info.reqid, | |
497 | p->info.id.proto, daddr, | |
498 | &p->info.saddr, 1, | |
499 | family); | |
500 | err = -ENOENT; | |
501 | if (x == NULL) | |
502 | goto out_noput; | |
503 | ||
504 | resp_skb = ERR_PTR(-ENOENT); | |
505 | ||
506 | spin_lock_bh(&x->lock); | |
507 | if (x->km.state != XFRM_STATE_DEAD) { | |
508 | xfrm_alloc_spi(x, htonl(p->min), htonl(p->max)); | |
509 | if (x->id.spi) | |
510 | resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); | |
511 | } | |
512 | spin_unlock_bh(&x->lock); | |
513 | ||
514 | if (IS_ERR(resp_skb)) { | |
515 | err = PTR_ERR(resp_skb); | |
516 | goto out; | |
517 | } | |
518 | ||
519 | err = netlink_unicast(xfrm_nl, resp_skb, | |
520 | NETLINK_CB(skb).pid, MSG_DONTWAIT); | |
521 | ||
522 | out: | |
523 | xfrm_state_put(x); | |
524 | out_noput: | |
525 | return err; | |
526 | } | |
527 | ||
528 | static int verify_policy_dir(__u8 dir) | |
529 | { | |
530 | switch (dir) { | |
531 | case XFRM_POLICY_IN: | |
532 | case XFRM_POLICY_OUT: | |
533 | case XFRM_POLICY_FWD: | |
534 | break; | |
535 | ||
536 | default: | |
537 | return -EINVAL; | |
538 | }; | |
539 | ||
540 | return 0; | |
541 | } | |
542 | ||
543 | static int verify_newpolicy_info(struct xfrm_userpolicy_info *p) | |
544 | { | |
545 | switch (p->share) { | |
546 | case XFRM_SHARE_ANY: | |
547 | case XFRM_SHARE_SESSION: | |
548 | case XFRM_SHARE_USER: | |
549 | case XFRM_SHARE_UNIQUE: | |
550 | break; | |
551 | ||
552 | default: | |
553 | return -EINVAL; | |
554 | }; | |
555 | ||
556 | switch (p->action) { | |
557 | case XFRM_POLICY_ALLOW: | |
558 | case XFRM_POLICY_BLOCK: | |
559 | break; | |
560 | ||
561 | default: | |
562 | return -EINVAL; | |
563 | }; | |
564 | ||
565 | switch (p->sel.family) { | |
566 | case AF_INET: | |
567 | break; | |
568 | ||
569 | case AF_INET6: | |
570 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
571 | break; | |
572 | #else | |
573 | return -EAFNOSUPPORT; | |
574 | #endif | |
575 | ||
576 | default: | |
577 | return -EINVAL; | |
578 | }; | |
579 | ||
580 | return verify_policy_dir(p->dir); | |
581 | } | |
582 | ||
583 | static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut, | |
584 | int nr) | |
585 | { | |
586 | int i; | |
587 | ||
588 | xp->xfrm_nr = nr; | |
589 | for (i = 0; i < nr; i++, ut++) { | |
590 | struct xfrm_tmpl *t = &xp->xfrm_vec[i]; | |
591 | ||
592 | memcpy(&t->id, &ut->id, sizeof(struct xfrm_id)); | |
593 | memcpy(&t->saddr, &ut->saddr, | |
594 | sizeof(xfrm_address_t)); | |
595 | t->reqid = ut->reqid; | |
596 | t->mode = ut->mode; | |
597 | t->share = ut->share; | |
598 | t->optional = ut->optional; | |
599 | t->aalgos = ut->aalgos; | |
600 | t->ealgos = ut->ealgos; | |
601 | t->calgos = ut->calgos; | |
602 | } | |
603 | } | |
604 | ||
605 | static int copy_from_user_tmpl(struct xfrm_policy *pol, struct rtattr **xfrma) | |
606 | { | |
607 | struct rtattr *rt = xfrma[XFRMA_TMPL-1]; | |
608 | struct xfrm_user_tmpl *utmpl; | |
609 | int nr; | |
610 | ||
611 | if (!rt) { | |
612 | pol->xfrm_nr = 0; | |
613 | } else { | |
614 | nr = (rt->rta_len - sizeof(*rt)) / sizeof(*utmpl); | |
615 | ||
616 | if (nr > XFRM_MAX_DEPTH) | |
617 | return -EINVAL; | |
618 | ||
619 | copy_templates(pol, RTA_DATA(rt), nr); | |
620 | } | |
621 | return 0; | |
622 | } | |
623 | ||
624 | static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p) | |
625 | { | |
626 | xp->priority = p->priority; | |
627 | xp->index = p->index; | |
628 | memcpy(&xp->selector, &p->sel, sizeof(xp->selector)); | |
629 | memcpy(&xp->lft, &p->lft, sizeof(xp->lft)); | |
630 | xp->action = p->action; | |
631 | xp->flags = p->flags; | |
632 | xp->family = p->sel.family; | |
633 | /* XXX xp->share = p->share; */ | |
634 | } | |
635 | ||
636 | static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir) | |
637 | { | |
638 | memcpy(&p->sel, &xp->selector, sizeof(p->sel)); | |
639 | memcpy(&p->lft, &xp->lft, sizeof(p->lft)); | |
640 | memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft)); | |
641 | p->priority = xp->priority; | |
642 | p->index = xp->index; | |
643 | p->sel.family = xp->family; | |
644 | p->dir = dir; | |
645 | p->action = xp->action; | |
646 | p->flags = xp->flags; | |
647 | p->share = XFRM_SHARE_ANY; /* XXX xp->share */ | |
648 | } | |
649 | ||
650 | static struct xfrm_policy *xfrm_policy_construct(struct xfrm_userpolicy_info *p, struct rtattr **xfrma, int *errp) | |
651 | { | |
652 | struct xfrm_policy *xp = xfrm_policy_alloc(GFP_KERNEL); | |
653 | int err; | |
654 | ||
655 | if (!xp) { | |
656 | *errp = -ENOMEM; | |
657 | return NULL; | |
658 | } | |
659 | ||
660 | copy_from_user_policy(xp, p); | |
661 | err = copy_from_user_tmpl(xp, xfrma); | |
662 | if (err) { | |
663 | *errp = err; | |
664 | kfree(xp); | |
665 | xp = NULL; | |
666 | } | |
667 | ||
668 | return xp; | |
669 | } | |
670 | ||
671 | static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma) | |
672 | { | |
673 | struct xfrm_userpolicy_info *p = NLMSG_DATA(nlh); | |
674 | struct xfrm_policy *xp; | |
675 | int err; | |
676 | int excl; | |
677 | ||
678 | err = verify_newpolicy_info(p); | |
679 | if (err) | |
680 | return err; | |
681 | ||
682 | xp = xfrm_policy_construct(p, (struct rtattr **) xfrma, &err); | |
683 | if (!xp) | |
684 | return err; | |
685 | ||
686 | excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY; | |
687 | err = xfrm_policy_insert(p->dir, xp, excl); | |
688 | if (err) { | |
689 | kfree(xp); | |
690 | return err; | |
691 | } | |
692 | ||
693 | xfrm_pol_put(xp); | |
694 | ||
695 | return 0; | |
696 | } | |
697 | ||
698 | static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb) | |
699 | { | |
700 | struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH]; | |
701 | int i; | |
702 | ||
703 | if (xp->xfrm_nr == 0) | |
704 | return 0; | |
705 | ||
706 | for (i = 0; i < xp->xfrm_nr; i++) { | |
707 | struct xfrm_user_tmpl *up = &vec[i]; | |
708 | struct xfrm_tmpl *kp = &xp->xfrm_vec[i]; | |
709 | ||
710 | memcpy(&up->id, &kp->id, sizeof(up->id)); | |
711 | up->family = xp->family; | |
712 | memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr)); | |
713 | up->reqid = kp->reqid; | |
714 | up->mode = kp->mode; | |
715 | up->share = kp->share; | |
716 | up->optional = kp->optional; | |
717 | up->aalgos = kp->aalgos; | |
718 | up->ealgos = kp->ealgos; | |
719 | up->calgos = kp->calgos; | |
720 | } | |
721 | RTA_PUT(skb, XFRMA_TMPL, | |
722 | (sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr), | |
723 | vec); | |
724 | ||
725 | return 0; | |
726 | ||
727 | rtattr_failure: | |
728 | return -1; | |
729 | } | |
730 | ||
731 | static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr) | |
732 | { | |
733 | struct xfrm_dump_info *sp = ptr; | |
734 | struct xfrm_userpolicy_info *p; | |
735 | struct sk_buff *in_skb = sp->in_skb; | |
736 | struct sk_buff *skb = sp->out_skb; | |
737 | struct nlmsghdr *nlh; | |
738 | unsigned char *b = skb->tail; | |
739 | ||
740 | if (sp->this_idx < sp->start_idx) | |
741 | goto out; | |
742 | ||
743 | nlh = NLMSG_PUT(skb, NETLINK_CB(in_skb).pid, | |
744 | sp->nlmsg_seq, | |
745 | XFRM_MSG_NEWPOLICY, sizeof(*p)); | |
746 | p = NLMSG_DATA(nlh); | |
747 | nlh->nlmsg_flags = sp->nlmsg_flags; | |
748 | ||
749 | copy_to_user_policy(xp, p, dir); | |
750 | if (copy_to_user_tmpl(xp, skb) < 0) | |
751 | goto nlmsg_failure; | |
752 | ||
753 | nlh->nlmsg_len = skb->tail - b; | |
754 | out: | |
755 | sp->this_idx++; | |
756 | return 0; | |
757 | ||
758 | nlmsg_failure: | |
759 | skb_trim(skb, b - skb->data); | |
760 | return -1; | |
761 | } | |
762 | ||
763 | static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb) | |
764 | { | |
765 | struct xfrm_dump_info info; | |
766 | ||
767 | info.in_skb = cb->skb; | |
768 | info.out_skb = skb; | |
769 | info.nlmsg_seq = cb->nlh->nlmsg_seq; | |
770 | info.nlmsg_flags = NLM_F_MULTI; | |
771 | info.this_idx = 0; | |
772 | info.start_idx = cb->args[0]; | |
773 | (void) xfrm_policy_walk(dump_one_policy, &info); | |
774 | cb->args[0] = info.this_idx; | |
775 | ||
776 | return skb->len; | |
777 | } | |
778 | ||
779 | static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb, | |
780 | struct xfrm_policy *xp, | |
781 | int dir, u32 seq) | |
782 | { | |
783 | struct xfrm_dump_info info; | |
784 | struct sk_buff *skb; | |
785 | ||
786 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
787 | if (!skb) | |
788 | return ERR_PTR(-ENOMEM); | |
789 | ||
790 | NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid; | |
791 | info.in_skb = in_skb; | |
792 | info.out_skb = skb; | |
793 | info.nlmsg_seq = seq; | |
794 | info.nlmsg_flags = 0; | |
795 | info.this_idx = info.start_idx = 0; | |
796 | ||
797 | if (dump_one_policy(xp, dir, 0, &info) < 0) { | |
798 | kfree_skb(skb); | |
799 | return NULL; | |
800 | } | |
801 | ||
802 | return skb; | |
803 | } | |
804 | ||
805 | static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma) | |
806 | { | |
807 | struct xfrm_policy *xp; | |
808 | struct xfrm_userpolicy_id *p; | |
809 | int err; | |
810 | int delete; | |
811 | ||
812 | p = NLMSG_DATA(nlh); | |
813 | delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY; | |
814 | ||
815 | err = verify_policy_dir(p->dir); | |
816 | if (err) | |
817 | return err; | |
818 | ||
819 | if (p->index) | |
820 | xp = xfrm_policy_byid(p->dir, p->index, delete); | |
821 | else | |
822 | xp = xfrm_policy_bysel(p->dir, &p->sel, delete); | |
823 | if (xp == NULL) | |
824 | return -ENOENT; | |
825 | ||
826 | if (!delete) { | |
827 | struct sk_buff *resp_skb; | |
828 | ||
829 | resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq); | |
830 | if (IS_ERR(resp_skb)) { | |
831 | err = PTR_ERR(resp_skb); | |
832 | } else { | |
833 | err = netlink_unicast(xfrm_nl, resp_skb, | |
834 | NETLINK_CB(skb).pid, | |
835 | MSG_DONTWAIT); | |
836 | } | |
837 | } | |
838 | ||
839 | xfrm_pol_put(xp); | |
840 | ||
841 | return err; | |
842 | } | |
843 | ||
844 | static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma) | |
845 | { | |
846 | struct xfrm_usersa_flush *p = NLMSG_DATA(nlh); | |
847 | ||
848 | xfrm_state_flush(p->proto); | |
849 | return 0; | |
850 | } | |
851 | ||
852 | static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma) | |
853 | { | |
854 | xfrm_policy_flush(); | |
855 | return 0; | |
856 | } | |
857 | ||
858 | static const int xfrm_msg_min[(XFRM_MSG_MAX + 1 - XFRM_MSG_BASE)] = { | |
859 | NLMSG_LENGTH(sizeof(struct xfrm_usersa_info)), /* NEW SA */ | |
860 | NLMSG_LENGTH(sizeof(struct xfrm_usersa_id)), /* DEL SA */ | |
861 | NLMSG_LENGTH(sizeof(struct xfrm_usersa_id)), /* GET SA */ | |
862 | NLMSG_LENGTH(sizeof(struct xfrm_userpolicy_info)),/* NEW POLICY */ | |
863 | NLMSG_LENGTH(sizeof(struct xfrm_userpolicy_id)), /* DEL POLICY */ | |
864 | NLMSG_LENGTH(sizeof(struct xfrm_userpolicy_id)), /* GET POLICY */ | |
865 | NLMSG_LENGTH(sizeof(struct xfrm_userspi_info)), /* ALLOC SPI */ | |
866 | NLMSG_LENGTH(sizeof(struct xfrm_user_acquire)), /* ACQUIRE */ | |
867 | NLMSG_LENGTH(sizeof(struct xfrm_user_expire)), /* EXPIRE */ | |
868 | NLMSG_LENGTH(sizeof(struct xfrm_userpolicy_info)),/* UPD POLICY */ | |
869 | NLMSG_LENGTH(sizeof(struct xfrm_usersa_info)), /* UPD SA */ | |
870 | NLMSG_LENGTH(sizeof(struct xfrm_user_polexpire)), /* POLEXPIRE */ | |
871 | NLMSG_LENGTH(sizeof(struct xfrm_usersa_flush)), /* FLUSH SA */ | |
872 | NLMSG_LENGTH(0), /* FLUSH POLICY */ | |
873 | }; | |
874 | ||
875 | static struct xfrm_link { | |
876 | int (*doit)(struct sk_buff *, struct nlmsghdr *, void **); | |
877 | int (*dump)(struct sk_buff *, struct netlink_callback *); | |
878 | } xfrm_dispatch[] = { | |
879 | { .doit = xfrm_add_sa, }, | |
880 | { .doit = xfrm_del_sa, }, | |
881 | { | |
882 | .doit = xfrm_get_sa, | |
883 | .dump = xfrm_dump_sa, | |
884 | }, | |
885 | { .doit = xfrm_add_policy }, | |
886 | { .doit = xfrm_get_policy }, | |
887 | { | |
888 | .doit = xfrm_get_policy, | |
889 | .dump = xfrm_dump_policy, | |
890 | }, | |
891 | { .doit = xfrm_alloc_userspi }, | |
892 | {}, | |
893 | {}, | |
894 | { .doit = xfrm_add_policy }, | |
895 | { .doit = xfrm_add_sa, }, | |
896 | {}, | |
897 | { .doit = xfrm_flush_sa }, | |
898 | { .doit = xfrm_flush_policy }, | |
899 | }; | |
900 | ||
901 | static int xfrm_done(struct netlink_callback *cb) | |
902 | { | |
903 | return 0; | |
904 | } | |
905 | ||
906 | static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, int *errp) | |
907 | { | |
908 | struct rtattr *xfrma[XFRMA_MAX]; | |
909 | struct xfrm_link *link; | |
910 | int type, min_len; | |
911 | ||
912 | if (!(nlh->nlmsg_flags & NLM_F_REQUEST)) | |
913 | return 0; | |
914 | ||
915 | type = nlh->nlmsg_type; | |
916 | ||
917 | /* A control message: ignore them */ | |
918 | if (type < XFRM_MSG_BASE) | |
919 | return 0; | |
920 | ||
921 | /* Unknown message: reply with EINVAL */ | |
922 | if (type > XFRM_MSG_MAX) | |
923 | goto err_einval; | |
924 | ||
925 | type -= XFRM_MSG_BASE; | |
926 | link = &xfrm_dispatch[type]; | |
927 | ||
928 | /* All operations require privileges, even GET */ | |
929 | if (security_netlink_recv(skb)) { | |
930 | *errp = -EPERM; | |
931 | return -1; | |
932 | } | |
933 | ||
934 | if ((type == 2 || type == 5) && (nlh->nlmsg_flags & NLM_F_DUMP)) { | |
935 | u32 rlen; | |
936 | ||
937 | if (link->dump == NULL) | |
938 | goto err_einval; | |
939 | ||
940 | if ((*errp = netlink_dump_start(xfrm_nl, skb, nlh, | |
941 | link->dump, | |
942 | xfrm_done)) != 0) { | |
943 | return -1; | |
944 | } | |
945 | rlen = NLMSG_ALIGN(nlh->nlmsg_len); | |
946 | if (rlen > skb->len) | |
947 | rlen = skb->len; | |
948 | skb_pull(skb, rlen); | |
949 | return -1; | |
950 | } | |
951 | ||
952 | memset(xfrma, 0, sizeof(xfrma)); | |
953 | ||
954 | if (nlh->nlmsg_len < (min_len = xfrm_msg_min[type])) | |
955 | goto err_einval; | |
956 | ||
957 | if (nlh->nlmsg_len > min_len) { | |
958 | int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len); | |
959 | struct rtattr *attr = (void *) nlh + NLMSG_ALIGN(min_len); | |
960 | ||
961 | while (RTA_OK(attr, attrlen)) { | |
962 | unsigned short flavor = attr->rta_type; | |
963 | if (flavor) { | |
964 | if (flavor > XFRMA_MAX) | |
965 | goto err_einval; | |
966 | xfrma[flavor - 1] = attr; | |
967 | } | |
968 | attr = RTA_NEXT(attr, attrlen); | |
969 | } | |
970 | } | |
971 | ||
972 | if (link->doit == NULL) | |
973 | goto err_einval; | |
974 | *errp = link->doit(skb, nlh, (void **) &xfrma); | |
975 | ||
976 | return *errp; | |
977 | ||
978 | err_einval: | |
979 | *errp = -EINVAL; | |
980 | return -1; | |
981 | } | |
982 | ||
983 | static int xfrm_user_rcv_skb(struct sk_buff *skb) | |
984 | { | |
985 | int err; | |
986 | struct nlmsghdr *nlh; | |
987 | ||
988 | while (skb->len >= NLMSG_SPACE(0)) { | |
989 | u32 rlen; | |
990 | ||
991 | nlh = (struct nlmsghdr *) skb->data; | |
992 | if (nlh->nlmsg_len < sizeof(*nlh) || | |
993 | skb->len < nlh->nlmsg_len) | |
994 | return 0; | |
995 | rlen = NLMSG_ALIGN(nlh->nlmsg_len); | |
996 | if (rlen > skb->len) | |
997 | rlen = skb->len; | |
998 | if (xfrm_user_rcv_msg(skb, nlh, &err) < 0) { | |
999 | if (err == 0) | |
1000 | return -1; | |
1001 | netlink_ack(skb, nlh, err); | |
1002 | } else if (nlh->nlmsg_flags & NLM_F_ACK) | |
1003 | netlink_ack(skb, nlh, 0); | |
1004 | skb_pull(skb, rlen); | |
1005 | } | |
1006 | ||
1007 | return 0; | |
1008 | } | |
1009 | ||
1010 | static void xfrm_netlink_rcv(struct sock *sk, int len) | |
1011 | { | |
1012 | do { | |
1013 | struct sk_buff *skb; | |
1014 | ||
1015 | down(&xfrm_cfg_sem); | |
1016 | ||
1017 | while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { | |
1018 | if (xfrm_user_rcv_skb(skb)) { | |
1019 | if (skb->len) | |
1020 | skb_queue_head(&sk->sk_receive_queue, | |
1021 | skb); | |
1022 | else | |
1023 | kfree_skb(skb); | |
1024 | break; | |
1025 | } | |
1026 | kfree_skb(skb); | |
1027 | } | |
1028 | ||
1029 | up(&xfrm_cfg_sem); | |
1030 | ||
1031 | } while (xfrm_nl && xfrm_nl->sk_receive_queue.qlen); | |
1032 | } | |
1033 | ||
1034 | static int build_expire(struct sk_buff *skb, struct xfrm_state *x, int hard) | |
1035 | { | |
1036 | struct xfrm_user_expire *ue; | |
1037 | struct nlmsghdr *nlh; | |
1038 | unsigned char *b = skb->tail; | |
1039 | ||
1040 | nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_EXPIRE, | |
1041 | sizeof(*ue)); | |
1042 | ue = NLMSG_DATA(nlh); | |
1043 | nlh->nlmsg_flags = 0; | |
1044 | ||
1045 | copy_to_user_state(x, &ue->state); | |
1046 | ue->hard = (hard != 0) ? 1 : 0; | |
1047 | ||
1048 | nlh->nlmsg_len = skb->tail - b; | |
1049 | return skb->len; | |
1050 | ||
1051 | nlmsg_failure: | |
1052 | skb_trim(skb, b - skb->data); | |
1053 | return -1; | |
1054 | } | |
1055 | ||
1056 | static int xfrm_send_state_notify(struct xfrm_state *x, int hard) | |
1057 | { | |
1058 | struct sk_buff *skb; | |
1059 | ||
1060 | skb = alloc_skb(sizeof(struct xfrm_user_expire) + 16, GFP_ATOMIC); | |
1061 | if (skb == NULL) | |
1062 | return -ENOMEM; | |
1063 | ||
1064 | if (build_expire(skb, x, hard) < 0) | |
1065 | BUG(); | |
1066 | ||
1067 | NETLINK_CB(skb).dst_groups = XFRMGRP_EXPIRE; | |
1068 | ||
1069 | return netlink_broadcast(xfrm_nl, skb, 0, XFRMGRP_EXPIRE, GFP_ATOMIC); | |
1070 | } | |
1071 | ||
1072 | static int build_acquire(struct sk_buff *skb, struct xfrm_state *x, | |
1073 | struct xfrm_tmpl *xt, struct xfrm_policy *xp, | |
1074 | int dir) | |
1075 | { | |
1076 | struct xfrm_user_acquire *ua; | |
1077 | struct nlmsghdr *nlh; | |
1078 | unsigned char *b = skb->tail; | |
1079 | __u32 seq = xfrm_get_acqseq(); | |
1080 | ||
1081 | nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_ACQUIRE, | |
1082 | sizeof(*ua)); | |
1083 | ua = NLMSG_DATA(nlh); | |
1084 | nlh->nlmsg_flags = 0; | |
1085 | ||
1086 | memcpy(&ua->id, &x->id, sizeof(ua->id)); | |
1087 | memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr)); | |
1088 | memcpy(&ua->sel, &x->sel, sizeof(ua->sel)); | |
1089 | copy_to_user_policy(xp, &ua->policy, dir); | |
1090 | ua->aalgos = xt->aalgos; | |
1091 | ua->ealgos = xt->ealgos; | |
1092 | ua->calgos = xt->calgos; | |
1093 | ua->seq = x->km.seq = seq; | |
1094 | ||
1095 | if (copy_to_user_tmpl(xp, skb) < 0) | |
1096 | goto nlmsg_failure; | |
1097 | ||
1098 | nlh->nlmsg_len = skb->tail - b; | |
1099 | return skb->len; | |
1100 | ||
1101 | nlmsg_failure: | |
1102 | skb_trim(skb, b - skb->data); | |
1103 | return -1; | |
1104 | } | |
1105 | ||
1106 | static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt, | |
1107 | struct xfrm_policy *xp, int dir) | |
1108 | { | |
1109 | struct sk_buff *skb; | |
1110 | size_t len; | |
1111 | ||
1112 | len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr); | |
1113 | len += NLMSG_SPACE(sizeof(struct xfrm_user_acquire)); | |
1114 | skb = alloc_skb(len, GFP_ATOMIC); | |
1115 | if (skb == NULL) | |
1116 | return -ENOMEM; | |
1117 | ||
1118 | if (build_acquire(skb, x, xt, xp, dir) < 0) | |
1119 | BUG(); | |
1120 | ||
1121 | NETLINK_CB(skb).dst_groups = XFRMGRP_ACQUIRE; | |
1122 | ||
1123 | return netlink_broadcast(xfrm_nl, skb, 0, XFRMGRP_ACQUIRE, GFP_ATOMIC); | |
1124 | } | |
1125 | ||
1126 | /* User gives us xfrm_user_policy_info followed by an array of 0 | |
1127 | * or more templates. | |
1128 | */ | |
1129 | static struct xfrm_policy *xfrm_compile_policy(u16 family, int opt, | |
1130 | u8 *data, int len, int *dir) | |
1131 | { | |
1132 | struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data; | |
1133 | struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1); | |
1134 | struct xfrm_policy *xp; | |
1135 | int nr; | |
1136 | ||
1137 | switch (family) { | |
1138 | case AF_INET: | |
1139 | if (opt != IP_XFRM_POLICY) { | |
1140 | *dir = -EOPNOTSUPP; | |
1141 | return NULL; | |
1142 | } | |
1143 | break; | |
1144 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
1145 | case AF_INET6: | |
1146 | if (opt != IPV6_XFRM_POLICY) { | |
1147 | *dir = -EOPNOTSUPP; | |
1148 | return NULL; | |
1149 | } | |
1150 | break; | |
1151 | #endif | |
1152 | default: | |
1153 | *dir = -EINVAL; | |
1154 | return NULL; | |
1155 | } | |
1156 | ||
1157 | *dir = -EINVAL; | |
1158 | ||
1159 | if (len < sizeof(*p) || | |
1160 | verify_newpolicy_info(p)) | |
1161 | return NULL; | |
1162 | ||
1163 | nr = ((len - sizeof(*p)) / sizeof(*ut)); | |
1164 | if (nr > XFRM_MAX_DEPTH) | |
1165 | return NULL; | |
1166 | ||
1167 | xp = xfrm_policy_alloc(GFP_KERNEL); | |
1168 | if (xp == NULL) { | |
1169 | *dir = -ENOBUFS; | |
1170 | return NULL; | |
1171 | } | |
1172 | ||
1173 | copy_from_user_policy(xp, p); | |
1174 | copy_templates(xp, ut, nr); | |
1175 | ||
1176 | *dir = p->dir; | |
1177 | ||
1178 | return xp; | |
1179 | } | |
1180 | ||
1181 | static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp, | |
1182 | int dir, int hard) | |
1183 | { | |
1184 | struct xfrm_user_polexpire *upe; | |
1185 | struct nlmsghdr *nlh; | |
1186 | unsigned char *b = skb->tail; | |
1187 | ||
1188 | nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe)); | |
1189 | upe = NLMSG_DATA(nlh); | |
1190 | nlh->nlmsg_flags = 0; | |
1191 | ||
1192 | copy_to_user_policy(xp, &upe->pol, dir); | |
1193 | if (copy_to_user_tmpl(xp, skb) < 0) | |
1194 | goto nlmsg_failure; | |
1195 | upe->hard = !!hard; | |
1196 | ||
1197 | nlh->nlmsg_len = skb->tail - b; | |
1198 | return skb->len; | |
1199 | ||
1200 | nlmsg_failure: | |
1201 | skb_trim(skb, b - skb->data); | |
1202 | return -1; | |
1203 | } | |
1204 | ||
1205 | static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, int hard) | |
1206 | { | |
1207 | struct sk_buff *skb; | |
1208 | size_t len; | |
1209 | ||
1210 | len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr); | |
1211 | len += NLMSG_SPACE(sizeof(struct xfrm_user_polexpire)); | |
1212 | skb = alloc_skb(len, GFP_ATOMIC); | |
1213 | if (skb == NULL) | |
1214 | return -ENOMEM; | |
1215 | ||
1216 | if (build_polexpire(skb, xp, dir, hard) < 0) | |
1217 | BUG(); | |
1218 | ||
1219 | NETLINK_CB(skb).dst_groups = XFRMGRP_EXPIRE; | |
1220 | ||
1221 | return netlink_broadcast(xfrm_nl, skb, 0, XFRMGRP_EXPIRE, GFP_ATOMIC); | |
1222 | } | |
1223 | ||
1224 | static struct xfrm_mgr netlink_mgr = { | |
1225 | .id = "netlink", | |
1226 | .notify = xfrm_send_state_notify, | |
1227 | .acquire = xfrm_send_acquire, | |
1228 | .compile_policy = xfrm_compile_policy, | |
1229 | .notify_policy = xfrm_send_policy_notify, | |
1230 | }; | |
1231 | ||
1232 | static int __init xfrm_user_init(void) | |
1233 | { | |
1234 | printk(KERN_INFO "Initializing IPsec netlink socket\n"); | |
1235 | ||
1236 | xfrm_nl = netlink_kernel_create(NETLINK_XFRM, xfrm_netlink_rcv); | |
1237 | if (xfrm_nl == NULL) | |
1238 | return -ENOMEM; | |
1239 | ||
1240 | xfrm_register_km(&netlink_mgr); | |
1241 | ||
1242 | return 0; | |
1243 | } | |
1244 | ||
1245 | static void __exit xfrm_user_exit(void) | |
1246 | { | |
1247 | xfrm_unregister_km(&netlink_mgr); | |
1248 | sock_release(xfrm_nl->sk_socket); | |
1249 | } | |
1250 | ||
1251 | module_init(xfrm_user_init); | |
1252 | module_exit(xfrm_user_exit); | |
1253 | MODULE_LICENSE("GPL"); |