Commit | Line | Data |
---|---|---|
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; | |
31c26852 | 37 | int len; |
1da177e4 LT |
38 | |
39 | if (!rt) | |
40 | return 0; | |
41 | ||
31c26852 HX |
42 | len = (rt->rta_len - sizeof(*rt)) - sizeof(*algp); |
43 | if (len < 0) | |
1da177e4 LT |
44 | return -EINVAL; |
45 | ||
46 | algp = RTA_DATA(rt); | |
31c26852 HX |
47 | |
48 | len -= (algp->alg_key_len + 7U) / 8; | |
49 | if (len < 0) | |
50 | return -EINVAL; | |
51 | ||
1da177e4 LT |
52 | switch (type) { |
53 | case XFRMA_ALG_AUTH: | |
54 | if (!algp->alg_key_len && | |
55 | strcmp(algp->alg_name, "digest_null") != 0) | |
56 | return -EINVAL; | |
57 | break; | |
58 | ||
59 | case XFRMA_ALG_CRYPT: | |
60 | if (!algp->alg_key_len && | |
61 | strcmp(algp->alg_name, "cipher_null") != 0) | |
62 | return -EINVAL; | |
63 | break; | |
64 | ||
65 | case XFRMA_ALG_COMP: | |
66 | /* Zero length keys are legal. */ | |
67 | break; | |
68 | ||
69 | default: | |
70 | return -EINVAL; | |
71 | }; | |
72 | ||
73 | algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0'; | |
74 | return 0; | |
75 | } | |
76 | ||
77 | static int verify_encap_tmpl(struct rtattr **xfrma) | |
78 | { | |
79 | struct rtattr *rt = xfrma[XFRMA_ENCAP - 1]; | |
80 | struct xfrm_encap_tmpl *encap; | |
81 | ||
82 | if (!rt) | |
83 | return 0; | |
84 | ||
85 | if ((rt->rta_len - sizeof(*rt)) < sizeof(*encap)) | |
86 | return -EINVAL; | |
87 | ||
88 | return 0; | |
89 | } | |
90 | ||
91 | static int verify_newsa_info(struct xfrm_usersa_info *p, | |
92 | struct rtattr **xfrma) | |
93 | { | |
94 | int err; | |
95 | ||
96 | err = -EINVAL; | |
97 | switch (p->family) { | |
98 | case AF_INET: | |
99 | break; | |
100 | ||
101 | case AF_INET6: | |
102 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
103 | break; | |
104 | #else | |
105 | err = -EAFNOSUPPORT; | |
106 | goto out; | |
107 | #endif | |
108 | ||
109 | default: | |
110 | goto out; | |
111 | }; | |
112 | ||
113 | err = -EINVAL; | |
114 | switch (p->id.proto) { | |
115 | case IPPROTO_AH: | |
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_ESP: | |
123 | if ((!xfrma[XFRMA_ALG_AUTH-1] && | |
124 | !xfrma[XFRMA_ALG_CRYPT-1]) || | |
125 | xfrma[XFRMA_ALG_COMP-1]) | |
126 | goto out; | |
127 | break; | |
128 | ||
129 | case IPPROTO_COMP: | |
130 | if (!xfrma[XFRMA_ALG_COMP-1] || | |
131 | xfrma[XFRMA_ALG_AUTH-1] || | |
132 | xfrma[XFRMA_ALG_CRYPT-1]) | |
133 | goto out; | |
134 | break; | |
135 | ||
136 | default: | |
137 | goto out; | |
138 | }; | |
139 | ||
140 | if ((err = verify_one_alg(xfrma, XFRMA_ALG_AUTH))) | |
141 | goto out; | |
142 | if ((err = verify_one_alg(xfrma, XFRMA_ALG_CRYPT))) | |
143 | goto out; | |
144 | if ((err = verify_one_alg(xfrma, XFRMA_ALG_COMP))) | |
145 | goto out; | |
146 | if ((err = verify_encap_tmpl(xfrma))) | |
147 | goto out; | |
148 | ||
149 | err = -EINVAL; | |
150 | switch (p->mode) { | |
151 | case 0: | |
152 | case 1: | |
153 | break; | |
154 | ||
155 | default: | |
156 | goto out; | |
157 | }; | |
158 | ||
159 | err = 0; | |
160 | ||
161 | out: | |
162 | return err; | |
163 | } | |
164 | ||
165 | static int attach_one_algo(struct xfrm_algo **algpp, u8 *props, | |
166 | struct xfrm_algo_desc *(*get_byname)(char *, int), | |
167 | struct rtattr *u_arg) | |
168 | { | |
169 | struct rtattr *rta = u_arg; | |
170 | struct xfrm_algo *p, *ualg; | |
171 | struct xfrm_algo_desc *algo; | |
b9e9dead | 172 | int len; |
1da177e4 LT |
173 | |
174 | if (!rta) | |
175 | return 0; | |
176 | ||
177 | ualg = RTA_DATA(rta); | |
178 | ||
179 | algo = get_byname(ualg->alg_name, 1); | |
180 | if (!algo) | |
181 | return -ENOSYS; | |
182 | *props = algo->desc.sadb_alg_id; | |
183 | ||
b9e9dead HX |
184 | len = sizeof(*ualg) + (ualg->alg_key_len + 7U) / 8; |
185 | p = kmalloc(len, GFP_KERNEL); | |
1da177e4 LT |
186 | if (!p) |
187 | return -ENOMEM; | |
188 | ||
b9e9dead | 189 | memcpy(p, ualg, len); |
1da177e4 LT |
190 | *algpp = p; |
191 | return 0; | |
192 | } | |
193 | ||
194 | static int attach_encap_tmpl(struct xfrm_encap_tmpl **encapp, struct rtattr *u_arg) | |
195 | { | |
196 | struct rtattr *rta = u_arg; | |
197 | struct xfrm_encap_tmpl *p, *uencap; | |
198 | ||
199 | if (!rta) | |
200 | return 0; | |
201 | ||
202 | uencap = RTA_DATA(rta); | |
203 | p = kmalloc(sizeof(*p), GFP_KERNEL); | |
204 | if (!p) | |
205 | return -ENOMEM; | |
206 | ||
207 | memcpy(p, uencap, sizeof(*p)); | |
208 | *encapp = p; | |
209 | return 0; | |
210 | } | |
211 | ||
212 | static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p) | |
213 | { | |
214 | memcpy(&x->id, &p->id, sizeof(x->id)); | |
215 | memcpy(&x->sel, &p->sel, sizeof(x->sel)); | |
216 | memcpy(&x->lft, &p->lft, sizeof(x->lft)); | |
217 | x->props.mode = p->mode; | |
218 | x->props.replay_window = p->replay_window; | |
219 | x->props.reqid = p->reqid; | |
220 | x->props.family = p->family; | |
221 | x->props.saddr = p->saddr; | |
222 | x->props.flags = p->flags; | |
223 | } | |
224 | ||
225 | static struct xfrm_state *xfrm_state_construct(struct xfrm_usersa_info *p, | |
226 | struct rtattr **xfrma, | |
227 | int *errp) | |
228 | { | |
229 | struct xfrm_state *x = xfrm_state_alloc(); | |
230 | int err = -ENOMEM; | |
231 | ||
232 | if (!x) | |
233 | goto error_no_put; | |
234 | ||
235 | copy_from_user_state(x, p); | |
236 | ||
237 | if ((err = attach_one_algo(&x->aalg, &x->props.aalgo, | |
238 | xfrm_aalg_get_byname, | |
239 | xfrma[XFRMA_ALG_AUTH-1]))) | |
240 | goto error; | |
241 | if ((err = attach_one_algo(&x->ealg, &x->props.ealgo, | |
242 | xfrm_ealg_get_byname, | |
243 | xfrma[XFRMA_ALG_CRYPT-1]))) | |
244 | goto error; | |
245 | if ((err = attach_one_algo(&x->calg, &x->props.calgo, | |
246 | xfrm_calg_get_byname, | |
247 | xfrma[XFRMA_ALG_COMP-1]))) | |
248 | goto error; | |
249 | if ((err = attach_encap_tmpl(&x->encap, xfrma[XFRMA_ENCAP-1]))) | |
250 | goto error; | |
251 | ||
72cb6962 | 252 | err = xfrm_init_state(x); |
1da177e4 LT |
253 | if (err) |
254 | goto error; | |
255 | ||
1da177e4 LT |
256 | x->km.seq = p->seq; |
257 | ||
258 | return x; | |
259 | ||
260 | error: | |
261 | x->km.state = XFRM_STATE_DEAD; | |
262 | xfrm_state_put(x); | |
263 | error_no_put: | |
264 | *errp = err; | |
265 | return NULL; | |
266 | } | |
267 | ||
268 | static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma) | |
269 | { | |
270 | struct xfrm_usersa_info *p = NLMSG_DATA(nlh); | |
271 | struct xfrm_state *x; | |
272 | int err; | |
26b15dad | 273 | struct km_event c; |
1da177e4 LT |
274 | |
275 | err = verify_newsa_info(p, (struct rtattr **) xfrma); | |
276 | if (err) | |
277 | return err; | |
278 | ||
279 | x = xfrm_state_construct(p, (struct rtattr **) xfrma, &err); | |
280 | if (!x) | |
281 | return err; | |
282 | ||
26b15dad | 283 | xfrm_state_hold(x); |
1da177e4 LT |
284 | if (nlh->nlmsg_type == XFRM_MSG_NEWSA) |
285 | err = xfrm_state_add(x); | |
286 | else | |
287 | err = xfrm_state_update(x); | |
288 | ||
289 | if (err < 0) { | |
290 | x->km.state = XFRM_STATE_DEAD; | |
291 | xfrm_state_put(x); | |
7d6dfe1f | 292 | goto out; |
1da177e4 LT |
293 | } |
294 | ||
26b15dad JHS |
295 | c.seq = nlh->nlmsg_seq; |
296 | c.pid = nlh->nlmsg_pid; | |
f60f6b8f | 297 | c.event = nlh->nlmsg_type; |
26b15dad JHS |
298 | |
299 | km_state_notify(x, &c); | |
7d6dfe1f | 300 | out: |
26b15dad | 301 | xfrm_state_put(x); |
1da177e4 LT |
302 | return err; |
303 | } | |
304 | ||
305 | static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma) | |
306 | { | |
307 | struct xfrm_state *x; | |
26b15dad JHS |
308 | int err; |
309 | struct km_event c; | |
1da177e4 LT |
310 | struct xfrm_usersa_id *p = NLMSG_DATA(nlh); |
311 | ||
312 | x = xfrm_state_lookup(&p->daddr, p->spi, p->proto, p->family); | |
313 | if (x == NULL) | |
314 | return -ESRCH; | |
315 | ||
316 | if (xfrm_state_kern(x)) { | |
317 | xfrm_state_put(x); | |
318 | return -EPERM; | |
319 | } | |
320 | ||
26b15dad JHS |
321 | err = xfrm_state_delete(x); |
322 | if (err < 0) { | |
323 | xfrm_state_put(x); | |
324 | return err; | |
325 | } | |
326 | ||
327 | c.seq = nlh->nlmsg_seq; | |
328 | c.pid = nlh->nlmsg_pid; | |
f60f6b8f | 329 | c.event = nlh->nlmsg_type; |
26b15dad | 330 | km_state_notify(x, &c); |
1da177e4 LT |
331 | xfrm_state_put(x); |
332 | ||
26b15dad | 333 | return err; |
1da177e4 LT |
334 | } |
335 | ||
336 | static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p) | |
337 | { | |
338 | memcpy(&p->id, &x->id, sizeof(p->id)); | |
339 | memcpy(&p->sel, &x->sel, sizeof(p->sel)); | |
340 | memcpy(&p->lft, &x->lft, sizeof(p->lft)); | |
341 | memcpy(&p->curlft, &x->curlft, sizeof(p->curlft)); | |
342 | memcpy(&p->stats, &x->stats, sizeof(p->stats)); | |
343 | p->saddr = x->props.saddr; | |
344 | p->mode = x->props.mode; | |
345 | p->replay_window = x->props.replay_window; | |
346 | p->reqid = x->props.reqid; | |
347 | p->family = x->props.family; | |
348 | p->flags = x->props.flags; | |
349 | p->seq = x->km.seq; | |
350 | } | |
351 | ||
352 | struct xfrm_dump_info { | |
353 | struct sk_buff *in_skb; | |
354 | struct sk_buff *out_skb; | |
355 | u32 nlmsg_seq; | |
356 | u16 nlmsg_flags; | |
357 | int start_idx; | |
358 | int this_idx; | |
359 | }; | |
360 | ||
361 | static int dump_one_state(struct xfrm_state *x, int count, void *ptr) | |
362 | { | |
363 | struct xfrm_dump_info *sp = ptr; | |
364 | struct sk_buff *in_skb = sp->in_skb; | |
365 | struct sk_buff *skb = sp->out_skb; | |
366 | struct xfrm_usersa_info *p; | |
367 | struct nlmsghdr *nlh; | |
368 | unsigned char *b = skb->tail; | |
369 | ||
370 | if (sp->this_idx < sp->start_idx) | |
371 | goto out; | |
372 | ||
373 | nlh = NLMSG_PUT(skb, NETLINK_CB(in_skb).pid, | |
374 | sp->nlmsg_seq, | |
375 | XFRM_MSG_NEWSA, sizeof(*p)); | |
376 | nlh->nlmsg_flags = sp->nlmsg_flags; | |
377 | ||
378 | p = NLMSG_DATA(nlh); | |
379 | copy_to_user_state(x, p); | |
380 | ||
381 | if (x->aalg) | |
382 | RTA_PUT(skb, XFRMA_ALG_AUTH, | |
383 | sizeof(*(x->aalg))+(x->aalg->alg_key_len+7)/8, x->aalg); | |
384 | if (x->ealg) | |
385 | RTA_PUT(skb, XFRMA_ALG_CRYPT, | |
386 | sizeof(*(x->ealg))+(x->ealg->alg_key_len+7)/8, x->ealg); | |
387 | if (x->calg) | |
388 | RTA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg); | |
389 | ||
390 | if (x->encap) | |
391 | RTA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap); | |
392 | ||
393 | nlh->nlmsg_len = skb->tail - b; | |
394 | out: | |
395 | sp->this_idx++; | |
396 | return 0; | |
397 | ||
398 | nlmsg_failure: | |
399 | rtattr_failure: | |
400 | skb_trim(skb, b - skb->data); | |
401 | return -1; | |
402 | } | |
403 | ||
404 | static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb) | |
405 | { | |
406 | struct xfrm_dump_info info; | |
407 | ||
408 | info.in_skb = cb->skb; | |
409 | info.out_skb = skb; | |
410 | info.nlmsg_seq = cb->nlh->nlmsg_seq; | |
411 | info.nlmsg_flags = NLM_F_MULTI; | |
412 | info.this_idx = 0; | |
413 | info.start_idx = cb->args[0]; | |
414 | (void) xfrm_state_walk(IPSEC_PROTO_ANY, dump_one_state, &info); | |
415 | cb->args[0] = info.this_idx; | |
416 | ||
417 | return skb->len; | |
418 | } | |
419 | ||
420 | static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb, | |
421 | struct xfrm_state *x, u32 seq) | |
422 | { | |
423 | struct xfrm_dump_info info; | |
424 | struct sk_buff *skb; | |
425 | ||
426 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC); | |
427 | if (!skb) | |
428 | return ERR_PTR(-ENOMEM); | |
429 | ||
430 | NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid; | |
431 | info.in_skb = in_skb; | |
432 | info.out_skb = skb; | |
433 | info.nlmsg_seq = seq; | |
434 | info.nlmsg_flags = 0; | |
435 | info.this_idx = info.start_idx = 0; | |
436 | ||
437 | if (dump_one_state(x, 0, &info)) { | |
438 | kfree_skb(skb); | |
439 | return NULL; | |
440 | } | |
441 | ||
442 | return skb; | |
443 | } | |
444 | ||
445 | static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma) | |
446 | { | |
447 | struct xfrm_usersa_id *p = NLMSG_DATA(nlh); | |
448 | struct xfrm_state *x; | |
449 | struct sk_buff *resp_skb; | |
450 | int err; | |
451 | ||
452 | x = xfrm_state_lookup(&p->daddr, p->spi, p->proto, p->family); | |
453 | err = -ESRCH; | |
454 | if (x == NULL) | |
455 | goto out_noput; | |
456 | ||
457 | resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); | |
458 | if (IS_ERR(resp_skb)) { | |
459 | err = PTR_ERR(resp_skb); | |
460 | } else { | |
461 | err = netlink_unicast(xfrm_nl, resp_skb, | |
462 | NETLINK_CB(skb).pid, MSG_DONTWAIT); | |
463 | } | |
464 | xfrm_state_put(x); | |
465 | out_noput: | |
466 | return err; | |
467 | } | |
468 | ||
469 | static int verify_userspi_info(struct xfrm_userspi_info *p) | |
470 | { | |
471 | switch (p->info.id.proto) { | |
472 | case IPPROTO_AH: | |
473 | case IPPROTO_ESP: | |
474 | break; | |
475 | ||
476 | case IPPROTO_COMP: | |
477 | /* IPCOMP spi is 16-bits. */ | |
478 | if (p->max >= 0x10000) | |
479 | return -EINVAL; | |
480 | break; | |
481 | ||
482 | default: | |
483 | return -EINVAL; | |
484 | }; | |
485 | ||
486 | if (p->min > p->max) | |
487 | return -EINVAL; | |
488 | ||
489 | return 0; | |
490 | } | |
491 | ||
492 | static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma) | |
493 | { | |
494 | struct xfrm_state *x; | |
495 | struct xfrm_userspi_info *p; | |
496 | struct sk_buff *resp_skb; | |
497 | xfrm_address_t *daddr; | |
498 | int family; | |
499 | int err; | |
500 | ||
501 | p = NLMSG_DATA(nlh); | |
502 | err = verify_userspi_info(p); | |
503 | if (err) | |
504 | goto out_noput; | |
505 | ||
506 | family = p->info.family; | |
507 | daddr = &p->info.id.daddr; | |
508 | ||
509 | x = NULL; | |
510 | if (p->info.seq) { | |
511 | x = xfrm_find_acq_byseq(p->info.seq); | |
512 | if (x && xfrm_addr_cmp(&x->id.daddr, daddr, family)) { | |
513 | xfrm_state_put(x); | |
514 | x = NULL; | |
515 | } | |
516 | } | |
517 | ||
518 | if (!x) | |
519 | x = xfrm_find_acq(p->info.mode, p->info.reqid, | |
520 | p->info.id.proto, daddr, | |
521 | &p->info.saddr, 1, | |
522 | family); | |
523 | err = -ENOENT; | |
524 | if (x == NULL) | |
525 | goto out_noput; | |
526 | ||
527 | resp_skb = ERR_PTR(-ENOENT); | |
528 | ||
529 | spin_lock_bh(&x->lock); | |
530 | if (x->km.state != XFRM_STATE_DEAD) { | |
531 | xfrm_alloc_spi(x, htonl(p->min), htonl(p->max)); | |
532 | if (x->id.spi) | |
533 | resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); | |
534 | } | |
535 | spin_unlock_bh(&x->lock); | |
536 | ||
537 | if (IS_ERR(resp_skb)) { | |
538 | err = PTR_ERR(resp_skb); | |
539 | goto out; | |
540 | } | |
541 | ||
542 | err = netlink_unicast(xfrm_nl, resp_skb, | |
543 | NETLINK_CB(skb).pid, MSG_DONTWAIT); | |
544 | ||
545 | out: | |
546 | xfrm_state_put(x); | |
547 | out_noput: | |
548 | return err; | |
549 | } | |
550 | ||
551 | static int verify_policy_dir(__u8 dir) | |
552 | { | |
553 | switch (dir) { | |
554 | case XFRM_POLICY_IN: | |
555 | case XFRM_POLICY_OUT: | |
556 | case XFRM_POLICY_FWD: | |
557 | break; | |
558 | ||
559 | default: | |
560 | return -EINVAL; | |
561 | }; | |
562 | ||
563 | return 0; | |
564 | } | |
565 | ||
566 | static int verify_newpolicy_info(struct xfrm_userpolicy_info *p) | |
567 | { | |
568 | switch (p->share) { | |
569 | case XFRM_SHARE_ANY: | |
570 | case XFRM_SHARE_SESSION: | |
571 | case XFRM_SHARE_USER: | |
572 | case XFRM_SHARE_UNIQUE: | |
573 | break; | |
574 | ||
575 | default: | |
576 | return -EINVAL; | |
577 | }; | |
578 | ||
579 | switch (p->action) { | |
580 | case XFRM_POLICY_ALLOW: | |
581 | case XFRM_POLICY_BLOCK: | |
582 | break; | |
583 | ||
584 | default: | |
585 | return -EINVAL; | |
586 | }; | |
587 | ||
588 | switch (p->sel.family) { | |
589 | case AF_INET: | |
590 | break; | |
591 | ||
592 | case AF_INET6: | |
593 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
594 | break; | |
595 | #else | |
596 | return -EAFNOSUPPORT; | |
597 | #endif | |
598 | ||
599 | default: | |
600 | return -EINVAL; | |
601 | }; | |
602 | ||
603 | return verify_policy_dir(p->dir); | |
604 | } | |
605 | ||
606 | static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut, | |
607 | int nr) | |
608 | { | |
609 | int i; | |
610 | ||
611 | xp->xfrm_nr = nr; | |
612 | for (i = 0; i < nr; i++, ut++) { | |
613 | struct xfrm_tmpl *t = &xp->xfrm_vec[i]; | |
614 | ||
615 | memcpy(&t->id, &ut->id, sizeof(struct xfrm_id)); | |
616 | memcpy(&t->saddr, &ut->saddr, | |
617 | sizeof(xfrm_address_t)); | |
618 | t->reqid = ut->reqid; | |
619 | t->mode = ut->mode; | |
620 | t->share = ut->share; | |
621 | t->optional = ut->optional; | |
622 | t->aalgos = ut->aalgos; | |
623 | t->ealgos = ut->ealgos; | |
624 | t->calgos = ut->calgos; | |
625 | } | |
626 | } | |
627 | ||
628 | static int copy_from_user_tmpl(struct xfrm_policy *pol, struct rtattr **xfrma) | |
629 | { | |
630 | struct rtattr *rt = xfrma[XFRMA_TMPL-1]; | |
631 | struct xfrm_user_tmpl *utmpl; | |
632 | int nr; | |
633 | ||
634 | if (!rt) { | |
635 | pol->xfrm_nr = 0; | |
636 | } else { | |
637 | nr = (rt->rta_len - sizeof(*rt)) / sizeof(*utmpl); | |
638 | ||
639 | if (nr > XFRM_MAX_DEPTH) | |
640 | return -EINVAL; | |
641 | ||
642 | copy_templates(pol, RTA_DATA(rt), nr); | |
643 | } | |
644 | return 0; | |
645 | } | |
646 | ||
647 | static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p) | |
648 | { | |
649 | xp->priority = p->priority; | |
650 | xp->index = p->index; | |
651 | memcpy(&xp->selector, &p->sel, sizeof(xp->selector)); | |
652 | memcpy(&xp->lft, &p->lft, sizeof(xp->lft)); | |
653 | xp->action = p->action; | |
654 | xp->flags = p->flags; | |
655 | xp->family = p->sel.family; | |
656 | /* XXX xp->share = p->share; */ | |
657 | } | |
658 | ||
659 | static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir) | |
660 | { | |
661 | memcpy(&p->sel, &xp->selector, sizeof(p->sel)); | |
662 | memcpy(&p->lft, &xp->lft, sizeof(p->lft)); | |
663 | memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft)); | |
664 | p->priority = xp->priority; | |
665 | p->index = xp->index; | |
666 | p->sel.family = xp->family; | |
667 | p->dir = dir; | |
668 | p->action = xp->action; | |
669 | p->flags = xp->flags; | |
670 | p->share = XFRM_SHARE_ANY; /* XXX xp->share */ | |
671 | } | |
672 | ||
673 | static struct xfrm_policy *xfrm_policy_construct(struct xfrm_userpolicy_info *p, struct rtattr **xfrma, int *errp) | |
674 | { | |
675 | struct xfrm_policy *xp = xfrm_policy_alloc(GFP_KERNEL); | |
676 | int err; | |
677 | ||
678 | if (!xp) { | |
679 | *errp = -ENOMEM; | |
680 | return NULL; | |
681 | } | |
682 | ||
683 | copy_from_user_policy(xp, p); | |
684 | err = copy_from_user_tmpl(xp, xfrma); | |
685 | if (err) { | |
686 | *errp = err; | |
687 | kfree(xp); | |
688 | xp = NULL; | |
689 | } | |
690 | ||
691 | return xp; | |
692 | } | |
693 | ||
694 | static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma) | |
695 | { | |
696 | struct xfrm_userpolicy_info *p = NLMSG_DATA(nlh); | |
697 | struct xfrm_policy *xp; | |
26b15dad | 698 | struct km_event c; |
1da177e4 LT |
699 | int err; |
700 | int excl; | |
701 | ||
702 | err = verify_newpolicy_info(p); | |
703 | if (err) | |
704 | return err; | |
705 | ||
706 | xp = xfrm_policy_construct(p, (struct rtattr **) xfrma, &err); | |
707 | if (!xp) | |
708 | return err; | |
709 | ||
26b15dad JHS |
710 | /* shouldnt excl be based on nlh flags?? |
711 | * Aha! this is anti-netlink really i.e more pfkey derived | |
712 | * in netlink excl is a flag and you wouldnt need | |
713 | * a type XFRM_MSG_UPDPOLICY - JHS */ | |
1da177e4 LT |
714 | excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY; |
715 | err = xfrm_policy_insert(p->dir, xp, excl); | |
716 | if (err) { | |
717 | kfree(xp); | |
718 | return err; | |
719 | } | |
720 | ||
f60f6b8f | 721 | c.event = nlh->nlmsg_type; |
26b15dad JHS |
722 | c.seq = nlh->nlmsg_seq; |
723 | c.pid = nlh->nlmsg_pid; | |
724 | km_policy_notify(xp, p->dir, &c); | |
725 | ||
1da177e4 LT |
726 | xfrm_pol_put(xp); |
727 | ||
728 | return 0; | |
729 | } | |
730 | ||
731 | static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb) | |
732 | { | |
733 | struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH]; | |
734 | int i; | |
735 | ||
736 | if (xp->xfrm_nr == 0) | |
737 | return 0; | |
738 | ||
739 | for (i = 0; i < xp->xfrm_nr; i++) { | |
740 | struct xfrm_user_tmpl *up = &vec[i]; | |
741 | struct xfrm_tmpl *kp = &xp->xfrm_vec[i]; | |
742 | ||
743 | memcpy(&up->id, &kp->id, sizeof(up->id)); | |
744 | up->family = xp->family; | |
745 | memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr)); | |
746 | up->reqid = kp->reqid; | |
747 | up->mode = kp->mode; | |
748 | up->share = kp->share; | |
749 | up->optional = kp->optional; | |
750 | up->aalgos = kp->aalgos; | |
751 | up->ealgos = kp->ealgos; | |
752 | up->calgos = kp->calgos; | |
753 | } | |
754 | RTA_PUT(skb, XFRMA_TMPL, | |
755 | (sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr), | |
756 | vec); | |
757 | ||
758 | return 0; | |
759 | ||
760 | rtattr_failure: | |
761 | return -1; | |
762 | } | |
763 | ||
764 | static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr) | |
765 | { | |
766 | struct xfrm_dump_info *sp = ptr; | |
767 | struct xfrm_userpolicy_info *p; | |
768 | struct sk_buff *in_skb = sp->in_skb; | |
769 | struct sk_buff *skb = sp->out_skb; | |
770 | struct nlmsghdr *nlh; | |
771 | unsigned char *b = skb->tail; | |
772 | ||
773 | if (sp->this_idx < sp->start_idx) | |
774 | goto out; | |
775 | ||
776 | nlh = NLMSG_PUT(skb, NETLINK_CB(in_skb).pid, | |
777 | sp->nlmsg_seq, | |
778 | XFRM_MSG_NEWPOLICY, sizeof(*p)); | |
779 | p = NLMSG_DATA(nlh); | |
780 | nlh->nlmsg_flags = sp->nlmsg_flags; | |
781 | ||
782 | copy_to_user_policy(xp, p, dir); | |
783 | if (copy_to_user_tmpl(xp, skb) < 0) | |
784 | goto nlmsg_failure; | |
785 | ||
786 | nlh->nlmsg_len = skb->tail - b; | |
787 | out: | |
788 | sp->this_idx++; | |
789 | return 0; | |
790 | ||
791 | nlmsg_failure: | |
792 | skb_trim(skb, b - skb->data); | |
793 | return -1; | |
794 | } | |
795 | ||
796 | static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb) | |
797 | { | |
798 | struct xfrm_dump_info info; | |
799 | ||
800 | info.in_skb = cb->skb; | |
801 | info.out_skb = skb; | |
802 | info.nlmsg_seq = cb->nlh->nlmsg_seq; | |
803 | info.nlmsg_flags = NLM_F_MULTI; | |
804 | info.this_idx = 0; | |
805 | info.start_idx = cb->args[0]; | |
806 | (void) xfrm_policy_walk(dump_one_policy, &info); | |
807 | cb->args[0] = info.this_idx; | |
808 | ||
809 | return skb->len; | |
810 | } | |
811 | ||
812 | static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb, | |
813 | struct xfrm_policy *xp, | |
814 | int dir, u32 seq) | |
815 | { | |
816 | struct xfrm_dump_info info; | |
817 | struct sk_buff *skb; | |
818 | ||
819 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
820 | if (!skb) | |
821 | return ERR_PTR(-ENOMEM); | |
822 | ||
823 | NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid; | |
824 | info.in_skb = in_skb; | |
825 | info.out_skb = skb; | |
826 | info.nlmsg_seq = seq; | |
827 | info.nlmsg_flags = 0; | |
828 | info.this_idx = info.start_idx = 0; | |
829 | ||
830 | if (dump_one_policy(xp, dir, 0, &info) < 0) { | |
831 | kfree_skb(skb); | |
832 | return NULL; | |
833 | } | |
834 | ||
835 | return skb; | |
836 | } | |
837 | ||
838 | static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma) | |
839 | { | |
840 | struct xfrm_policy *xp; | |
841 | struct xfrm_userpolicy_id *p; | |
842 | int err; | |
26b15dad | 843 | struct km_event c; |
1da177e4 LT |
844 | int delete; |
845 | ||
846 | p = NLMSG_DATA(nlh); | |
847 | delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY; | |
848 | ||
849 | err = verify_policy_dir(p->dir); | |
850 | if (err) | |
851 | return err; | |
852 | ||
853 | if (p->index) | |
854 | xp = xfrm_policy_byid(p->dir, p->index, delete); | |
855 | else | |
856 | xp = xfrm_policy_bysel(p->dir, &p->sel, delete); | |
857 | if (xp == NULL) | |
858 | return -ENOENT; | |
859 | ||
860 | if (!delete) { | |
861 | struct sk_buff *resp_skb; | |
862 | ||
863 | resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq); | |
864 | if (IS_ERR(resp_skb)) { | |
865 | err = PTR_ERR(resp_skb); | |
866 | } else { | |
867 | err = netlink_unicast(xfrm_nl, resp_skb, | |
868 | NETLINK_CB(skb).pid, | |
869 | MSG_DONTWAIT); | |
870 | } | |
26b15dad | 871 | } else { |
e7443892 | 872 | c.data.byid = p->index; |
f60f6b8f | 873 | c.event = nlh->nlmsg_type; |
26b15dad JHS |
874 | c.seq = nlh->nlmsg_seq; |
875 | c.pid = nlh->nlmsg_pid; | |
876 | km_policy_notify(xp, p->dir, &c); | |
1da177e4 LT |
877 | } |
878 | ||
879 | xfrm_pol_put(xp); | |
880 | ||
881 | return err; | |
882 | } | |
883 | ||
884 | static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma) | |
885 | { | |
26b15dad | 886 | struct km_event c; |
1da177e4 LT |
887 | struct xfrm_usersa_flush *p = NLMSG_DATA(nlh); |
888 | ||
889 | xfrm_state_flush(p->proto); | |
bf08867f | 890 | c.data.proto = p->proto; |
f60f6b8f | 891 | c.event = nlh->nlmsg_type; |
26b15dad JHS |
892 | c.seq = nlh->nlmsg_seq; |
893 | c.pid = nlh->nlmsg_pid; | |
894 | km_state_notify(NULL, &c); | |
895 | ||
1da177e4 LT |
896 | return 0; |
897 | } | |
898 | ||
899 | static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma) | |
900 | { | |
26b15dad JHS |
901 | struct km_event c; |
902 | ||
1da177e4 | 903 | xfrm_policy_flush(); |
f60f6b8f | 904 | c.event = nlh->nlmsg_type; |
26b15dad JHS |
905 | c.seq = nlh->nlmsg_seq; |
906 | c.pid = nlh->nlmsg_pid; | |
907 | km_policy_notify(NULL, 0, &c); | |
1da177e4 LT |
908 | return 0; |
909 | } | |
910 | ||
492b558b TG |
911 | #define XMSGSIZE(type) NLMSG_LENGTH(sizeof(struct type)) |
912 | ||
913 | static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = { | |
914 | [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), | |
915 | [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), | |
916 | [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), | |
917 | [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), | |
918 | [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), | |
919 | [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), | |
920 | [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info), | |
921 | [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire), | |
922 | [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire), | |
923 | [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), | |
924 | [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), | |
925 | [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire), | |
926 | [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush), | |
927 | [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = NLMSG_LENGTH(0), | |
1da177e4 LT |
928 | }; |
929 | ||
492b558b TG |
930 | #undef XMSGSIZE |
931 | ||
1da177e4 LT |
932 | static struct xfrm_link { |
933 | int (*doit)(struct sk_buff *, struct nlmsghdr *, void **); | |
934 | int (*dump)(struct sk_buff *, struct netlink_callback *); | |
492b558b TG |
935 | } xfrm_dispatch[XFRM_NR_MSGTYPES] = { |
936 | [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, | |
937 | [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa }, | |
938 | [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa, | |
939 | .dump = xfrm_dump_sa }, | |
940 | [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, | |
941 | [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy }, | |
942 | [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy, | |
943 | .dump = xfrm_dump_policy }, | |
944 | [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi }, | |
945 | [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, | |
946 | [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, | |
947 | [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa }, | |
948 | [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy }, | |
1da177e4 LT |
949 | }; |
950 | ||
951 | static int xfrm_done(struct netlink_callback *cb) | |
952 | { | |
953 | return 0; | |
954 | } | |
955 | ||
956 | static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, int *errp) | |
957 | { | |
958 | struct rtattr *xfrma[XFRMA_MAX]; | |
959 | struct xfrm_link *link; | |
960 | int type, min_len; | |
961 | ||
962 | if (!(nlh->nlmsg_flags & NLM_F_REQUEST)) | |
963 | return 0; | |
964 | ||
965 | type = nlh->nlmsg_type; | |
966 | ||
967 | /* A control message: ignore them */ | |
968 | if (type < XFRM_MSG_BASE) | |
969 | return 0; | |
970 | ||
971 | /* Unknown message: reply with EINVAL */ | |
972 | if (type > XFRM_MSG_MAX) | |
973 | goto err_einval; | |
974 | ||
975 | type -= XFRM_MSG_BASE; | |
976 | link = &xfrm_dispatch[type]; | |
977 | ||
978 | /* All operations require privileges, even GET */ | |
979 | if (security_netlink_recv(skb)) { | |
980 | *errp = -EPERM; | |
981 | return -1; | |
982 | } | |
983 | ||
492b558b TG |
984 | if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) || |
985 | type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) && | |
986 | (nlh->nlmsg_flags & NLM_F_DUMP)) { | |
1da177e4 LT |
987 | u32 rlen; |
988 | ||
989 | if (link->dump == NULL) | |
990 | goto err_einval; | |
991 | ||
992 | if ((*errp = netlink_dump_start(xfrm_nl, skb, nlh, | |
993 | link->dump, | |
994 | xfrm_done)) != 0) { | |
995 | return -1; | |
996 | } | |
997 | rlen = NLMSG_ALIGN(nlh->nlmsg_len); | |
998 | if (rlen > skb->len) | |
999 | rlen = skb->len; | |
1000 | skb_pull(skb, rlen); | |
1001 | return -1; | |
1002 | } | |
1003 | ||
1004 | memset(xfrma, 0, sizeof(xfrma)); | |
1005 | ||
1006 | if (nlh->nlmsg_len < (min_len = xfrm_msg_min[type])) | |
1007 | goto err_einval; | |
1008 | ||
1009 | if (nlh->nlmsg_len > min_len) { | |
1010 | int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len); | |
1011 | struct rtattr *attr = (void *) nlh + NLMSG_ALIGN(min_len); | |
1012 | ||
1013 | while (RTA_OK(attr, attrlen)) { | |
1014 | unsigned short flavor = attr->rta_type; | |
1015 | if (flavor) { | |
1016 | if (flavor > XFRMA_MAX) | |
1017 | goto err_einval; | |
1018 | xfrma[flavor - 1] = attr; | |
1019 | } | |
1020 | attr = RTA_NEXT(attr, attrlen); | |
1021 | } | |
1022 | } | |
1023 | ||
1024 | if (link->doit == NULL) | |
1025 | goto err_einval; | |
1026 | *errp = link->doit(skb, nlh, (void **) &xfrma); | |
1027 | ||
1028 | return *errp; | |
1029 | ||
1030 | err_einval: | |
1031 | *errp = -EINVAL; | |
1032 | return -1; | |
1033 | } | |
1034 | ||
1035 | static int xfrm_user_rcv_skb(struct sk_buff *skb) | |
1036 | { | |
1037 | int err; | |
1038 | struct nlmsghdr *nlh; | |
1039 | ||
1040 | while (skb->len >= NLMSG_SPACE(0)) { | |
1041 | u32 rlen; | |
1042 | ||
1043 | nlh = (struct nlmsghdr *) skb->data; | |
1044 | if (nlh->nlmsg_len < sizeof(*nlh) || | |
1045 | skb->len < nlh->nlmsg_len) | |
1046 | return 0; | |
1047 | rlen = NLMSG_ALIGN(nlh->nlmsg_len); | |
1048 | if (rlen > skb->len) | |
1049 | rlen = skb->len; | |
1050 | if (xfrm_user_rcv_msg(skb, nlh, &err) < 0) { | |
1051 | if (err == 0) | |
1052 | return -1; | |
1053 | netlink_ack(skb, nlh, err); | |
1054 | } else if (nlh->nlmsg_flags & NLM_F_ACK) | |
1055 | netlink_ack(skb, nlh, 0); | |
1056 | skb_pull(skb, rlen); | |
1057 | } | |
1058 | ||
1059 | return 0; | |
1060 | } | |
1061 | ||
1062 | static void xfrm_netlink_rcv(struct sock *sk, int len) | |
1063 | { | |
2a0a6ebe HX |
1064 | unsigned int qlen = skb_queue_len(&sk->sk_receive_queue); |
1065 | ||
1da177e4 LT |
1066 | do { |
1067 | struct sk_buff *skb; | |
1068 | ||
1069 | down(&xfrm_cfg_sem); | |
1070 | ||
2a0a6ebe HX |
1071 | if (qlen > skb_queue_len(&sk->sk_receive_queue)) |
1072 | qlen = skb_queue_len(&sk->sk_receive_queue); | |
1073 | ||
09e14305 | 1074 | for (; qlen; qlen--) { |
2a0a6ebe | 1075 | skb = skb_dequeue(&sk->sk_receive_queue); |
1da177e4 | 1076 | if (xfrm_user_rcv_skb(skb)) { |
09e14305 | 1077 | if (skb->len) |
1da177e4 LT |
1078 | skb_queue_head(&sk->sk_receive_queue, |
1079 | skb); | |
0f4821e7 | 1080 | else { |
1da177e4 | 1081 | kfree_skb(skb); |
0f4821e7 DM |
1082 | qlen--; |
1083 | } | |
1da177e4 LT |
1084 | break; |
1085 | } | |
1086 | kfree_skb(skb); | |
1087 | } | |
1088 | ||
1089 | up(&xfrm_cfg_sem); | |
1090 | ||
2a0a6ebe | 1091 | } while (qlen); |
1da177e4 LT |
1092 | } |
1093 | ||
1094 | static int build_expire(struct sk_buff *skb, struct xfrm_state *x, int hard) | |
1095 | { | |
1096 | struct xfrm_user_expire *ue; | |
1097 | struct nlmsghdr *nlh; | |
1098 | unsigned char *b = skb->tail; | |
1099 | ||
1100 | nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_EXPIRE, | |
1101 | sizeof(*ue)); | |
1102 | ue = NLMSG_DATA(nlh); | |
1103 | nlh->nlmsg_flags = 0; | |
1104 | ||
1105 | copy_to_user_state(x, &ue->state); | |
1106 | ue->hard = (hard != 0) ? 1 : 0; | |
1107 | ||
1108 | nlh->nlmsg_len = skb->tail - b; | |
1109 | return skb->len; | |
1110 | ||
1111 | nlmsg_failure: | |
1112 | skb_trim(skb, b - skb->data); | |
1113 | return -1; | |
1114 | } | |
1115 | ||
26b15dad | 1116 | static int xfrm_exp_state_notify(struct xfrm_state *x, struct km_event *c) |
1da177e4 LT |
1117 | { |
1118 | struct sk_buff *skb; | |
ee57eef9 | 1119 | int len = NLMSG_LENGTH(sizeof(struct xfrm_user_expire)); |
1da177e4 | 1120 | |
ee57eef9 | 1121 | skb = alloc_skb(len, GFP_ATOMIC); |
1da177e4 LT |
1122 | if (skb == NULL) |
1123 | return -ENOMEM; | |
1124 | ||
bf08867f | 1125 | if (build_expire(skb, x, c->data.hard) < 0) |
1da177e4 LT |
1126 | BUG(); |
1127 | ||
1128 | NETLINK_CB(skb).dst_groups = XFRMGRP_EXPIRE; | |
1129 | ||
1130 | return netlink_broadcast(xfrm_nl, skb, 0, XFRMGRP_EXPIRE, GFP_ATOMIC); | |
1131 | } | |
1132 | ||
26b15dad JHS |
1133 | static int xfrm_notify_sa_flush(struct km_event *c) |
1134 | { | |
1135 | struct xfrm_usersa_flush *p; | |
1136 | struct nlmsghdr *nlh; | |
1137 | struct sk_buff *skb; | |
1138 | unsigned char *b; | |
1139 | int len = NLMSG_LENGTH(sizeof(struct xfrm_usersa_flush)); | |
1140 | ||
1141 | skb = alloc_skb(len, GFP_ATOMIC); | |
1142 | if (skb == NULL) | |
1143 | return -ENOMEM; | |
1144 | b = skb->tail; | |
1145 | ||
1146 | nlh = NLMSG_PUT(skb, c->pid, c->seq, | |
1147 | XFRM_MSG_FLUSHSA, sizeof(*p)); | |
1148 | nlh->nlmsg_flags = 0; | |
1149 | ||
1150 | p = NLMSG_DATA(nlh); | |
bf08867f | 1151 | p->proto = c->data.proto; |
26b15dad JHS |
1152 | |
1153 | nlh->nlmsg_len = skb->tail - b; | |
1154 | ||
1155 | return netlink_broadcast(xfrm_nl, skb, 0, XFRMGRP_SA, GFP_ATOMIC); | |
1156 | ||
1157 | nlmsg_failure: | |
1158 | kfree_skb(skb); | |
1159 | return -1; | |
1160 | } | |
1161 | ||
1162 | static int inline xfrm_sa_len(struct xfrm_state *x) | |
1163 | { | |
0603eac0 | 1164 | int l = 0; |
26b15dad JHS |
1165 | if (x->aalg) |
1166 | l += RTA_SPACE(sizeof(*x->aalg) + (x->aalg->alg_key_len+7)/8); | |
1167 | if (x->ealg) | |
1168 | l += RTA_SPACE(sizeof(*x->ealg) + (x->ealg->alg_key_len+7)/8); | |
1169 | if (x->calg) | |
1170 | l += RTA_SPACE(sizeof(*x->calg)); | |
1171 | if (x->encap) | |
1172 | l += RTA_SPACE(sizeof(*x->encap)); | |
1173 | ||
1174 | return l; | |
1175 | } | |
1176 | ||
1177 | static int xfrm_notify_sa(struct xfrm_state *x, struct km_event *c) | |
1178 | { | |
1179 | struct xfrm_usersa_info *p; | |
0603eac0 | 1180 | struct xfrm_usersa_id *id; |
26b15dad JHS |
1181 | struct nlmsghdr *nlh; |
1182 | struct sk_buff *skb; | |
26b15dad JHS |
1183 | unsigned char *b; |
1184 | int len = xfrm_sa_len(x); | |
0603eac0 HX |
1185 | int headlen; |
1186 | ||
1187 | headlen = sizeof(*p); | |
1188 | if (c->event == XFRM_MSG_DELSA) { | |
1189 | len += RTA_SPACE(headlen); | |
1190 | headlen = sizeof(*id); | |
1191 | } | |
1192 | len += NLMSG_SPACE(headlen); | |
26b15dad JHS |
1193 | |
1194 | skb = alloc_skb(len, GFP_ATOMIC); | |
1195 | if (skb == NULL) | |
1196 | return -ENOMEM; | |
1197 | b = skb->tail; | |
1198 | ||
0603eac0 | 1199 | nlh = NLMSG_PUT(skb, c->pid, c->seq, c->event, headlen); |
26b15dad JHS |
1200 | nlh->nlmsg_flags = 0; |
1201 | ||
1202 | p = NLMSG_DATA(nlh); | |
0603eac0 HX |
1203 | if (c->event == XFRM_MSG_DELSA) { |
1204 | id = NLMSG_DATA(nlh); | |
1205 | memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr)); | |
1206 | id->spi = x->id.spi; | |
1207 | id->family = x->props.family; | |
1208 | id->proto = x->id.proto; | |
1209 | ||
1210 | p = RTA_DATA(__RTA_PUT(skb, XFRMA_SA, sizeof(*p))); | |
1211 | } | |
1212 | ||
26b15dad JHS |
1213 | copy_to_user_state(x, p); |
1214 | ||
1215 | if (x->aalg) | |
1216 | RTA_PUT(skb, XFRMA_ALG_AUTH, | |
1217 | sizeof(*(x->aalg))+(x->aalg->alg_key_len+7)/8, x->aalg); | |
1218 | if (x->ealg) | |
1219 | RTA_PUT(skb, XFRMA_ALG_CRYPT, | |
1220 | sizeof(*(x->ealg))+(x->ealg->alg_key_len+7)/8, x->ealg); | |
1221 | if (x->calg) | |
1222 | RTA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg); | |
1223 | ||
1224 | if (x->encap) | |
1225 | RTA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap); | |
1226 | ||
1227 | nlh->nlmsg_len = skb->tail - b; | |
1228 | ||
1229 | return netlink_broadcast(xfrm_nl, skb, 0, XFRMGRP_SA, GFP_ATOMIC); | |
1230 | ||
1231 | nlmsg_failure: | |
1232 | rtattr_failure: | |
1233 | kfree_skb(skb); | |
1234 | return -1; | |
1235 | } | |
1236 | ||
1237 | static int xfrm_send_state_notify(struct xfrm_state *x, struct km_event *c) | |
1238 | { | |
1239 | ||
1240 | switch (c->event) { | |
f60f6b8f | 1241 | case XFRM_MSG_EXPIRE: |
26b15dad | 1242 | return xfrm_exp_state_notify(x, c); |
f60f6b8f HX |
1243 | case XFRM_MSG_DELSA: |
1244 | case XFRM_MSG_UPDSA: | |
1245 | case XFRM_MSG_NEWSA: | |
26b15dad | 1246 | return xfrm_notify_sa(x, c); |
f60f6b8f | 1247 | case XFRM_MSG_FLUSHSA: |
26b15dad JHS |
1248 | return xfrm_notify_sa_flush(c); |
1249 | default: | |
1250 | printk("xfrm_user: Unknown SA event %d\n", c->event); | |
1251 | break; | |
1252 | } | |
1253 | ||
1254 | return 0; | |
1255 | ||
1256 | } | |
1257 | ||
1da177e4 LT |
1258 | static int build_acquire(struct sk_buff *skb, struct xfrm_state *x, |
1259 | struct xfrm_tmpl *xt, struct xfrm_policy *xp, | |
1260 | int dir) | |
1261 | { | |
1262 | struct xfrm_user_acquire *ua; | |
1263 | struct nlmsghdr *nlh; | |
1264 | unsigned char *b = skb->tail; | |
1265 | __u32 seq = xfrm_get_acqseq(); | |
1266 | ||
1267 | nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_ACQUIRE, | |
1268 | sizeof(*ua)); | |
1269 | ua = NLMSG_DATA(nlh); | |
1270 | nlh->nlmsg_flags = 0; | |
1271 | ||
1272 | memcpy(&ua->id, &x->id, sizeof(ua->id)); | |
1273 | memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr)); | |
1274 | memcpy(&ua->sel, &x->sel, sizeof(ua->sel)); | |
1275 | copy_to_user_policy(xp, &ua->policy, dir); | |
1276 | ua->aalgos = xt->aalgos; | |
1277 | ua->ealgos = xt->ealgos; | |
1278 | ua->calgos = xt->calgos; | |
1279 | ua->seq = x->km.seq = seq; | |
1280 | ||
1281 | if (copy_to_user_tmpl(xp, skb) < 0) | |
1282 | goto nlmsg_failure; | |
1283 | ||
1284 | nlh->nlmsg_len = skb->tail - b; | |
1285 | return skb->len; | |
1286 | ||
1287 | nlmsg_failure: | |
1288 | skb_trim(skb, b - skb->data); | |
1289 | return -1; | |
1290 | } | |
1291 | ||
1292 | static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt, | |
1293 | struct xfrm_policy *xp, int dir) | |
1294 | { | |
1295 | struct sk_buff *skb; | |
1296 | size_t len; | |
1297 | ||
1298 | len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr); | |
1299 | len += NLMSG_SPACE(sizeof(struct xfrm_user_acquire)); | |
1300 | skb = alloc_skb(len, GFP_ATOMIC); | |
1301 | if (skb == NULL) | |
1302 | return -ENOMEM; | |
1303 | ||
1304 | if (build_acquire(skb, x, xt, xp, dir) < 0) | |
1305 | BUG(); | |
1306 | ||
1307 | NETLINK_CB(skb).dst_groups = XFRMGRP_ACQUIRE; | |
1308 | ||
1309 | return netlink_broadcast(xfrm_nl, skb, 0, XFRMGRP_ACQUIRE, GFP_ATOMIC); | |
1310 | } | |
1311 | ||
1312 | /* User gives us xfrm_user_policy_info followed by an array of 0 | |
1313 | * or more templates. | |
1314 | */ | |
1315 | static struct xfrm_policy *xfrm_compile_policy(u16 family, int opt, | |
1316 | u8 *data, int len, int *dir) | |
1317 | { | |
1318 | struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data; | |
1319 | struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1); | |
1320 | struct xfrm_policy *xp; | |
1321 | int nr; | |
1322 | ||
1323 | switch (family) { | |
1324 | case AF_INET: | |
1325 | if (opt != IP_XFRM_POLICY) { | |
1326 | *dir = -EOPNOTSUPP; | |
1327 | return NULL; | |
1328 | } | |
1329 | break; | |
1330 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
1331 | case AF_INET6: | |
1332 | if (opt != IPV6_XFRM_POLICY) { | |
1333 | *dir = -EOPNOTSUPP; | |
1334 | return NULL; | |
1335 | } | |
1336 | break; | |
1337 | #endif | |
1338 | default: | |
1339 | *dir = -EINVAL; | |
1340 | return NULL; | |
1341 | } | |
1342 | ||
1343 | *dir = -EINVAL; | |
1344 | ||
1345 | if (len < sizeof(*p) || | |
1346 | verify_newpolicy_info(p)) | |
1347 | return NULL; | |
1348 | ||
1349 | nr = ((len - sizeof(*p)) / sizeof(*ut)); | |
1350 | if (nr > XFRM_MAX_DEPTH) | |
1351 | return NULL; | |
1352 | ||
1353 | xp = xfrm_policy_alloc(GFP_KERNEL); | |
1354 | if (xp == NULL) { | |
1355 | *dir = -ENOBUFS; | |
1356 | return NULL; | |
1357 | } | |
1358 | ||
1359 | copy_from_user_policy(xp, p); | |
1360 | copy_templates(xp, ut, nr); | |
1361 | ||
1362 | *dir = p->dir; | |
1363 | ||
1364 | return xp; | |
1365 | } | |
1366 | ||
1367 | static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp, | |
1368 | int dir, int hard) | |
1369 | { | |
1370 | struct xfrm_user_polexpire *upe; | |
1371 | struct nlmsghdr *nlh; | |
1372 | unsigned char *b = skb->tail; | |
1373 | ||
1374 | nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe)); | |
1375 | upe = NLMSG_DATA(nlh); | |
1376 | nlh->nlmsg_flags = 0; | |
1377 | ||
1378 | copy_to_user_policy(xp, &upe->pol, dir); | |
1379 | if (copy_to_user_tmpl(xp, skb) < 0) | |
1380 | goto nlmsg_failure; | |
1381 | upe->hard = !!hard; | |
1382 | ||
1383 | nlh->nlmsg_len = skb->tail - b; | |
1384 | return skb->len; | |
1385 | ||
1386 | nlmsg_failure: | |
1387 | skb_trim(skb, b - skb->data); | |
1388 | return -1; | |
1389 | } | |
1390 | ||
26b15dad | 1391 | static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c) |
1da177e4 LT |
1392 | { |
1393 | struct sk_buff *skb; | |
1394 | size_t len; | |
1395 | ||
1396 | len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr); | |
1397 | len += NLMSG_SPACE(sizeof(struct xfrm_user_polexpire)); | |
1398 | skb = alloc_skb(len, GFP_ATOMIC); | |
1399 | if (skb == NULL) | |
1400 | return -ENOMEM; | |
1401 | ||
bf08867f | 1402 | if (build_polexpire(skb, xp, dir, c->data.hard) < 0) |
1da177e4 LT |
1403 | BUG(); |
1404 | ||
1405 | NETLINK_CB(skb).dst_groups = XFRMGRP_EXPIRE; | |
1406 | ||
1407 | return netlink_broadcast(xfrm_nl, skb, 0, XFRMGRP_EXPIRE, GFP_ATOMIC); | |
1408 | } | |
1409 | ||
26b15dad JHS |
1410 | static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c) |
1411 | { | |
1412 | struct xfrm_userpolicy_info *p; | |
0603eac0 | 1413 | struct xfrm_userpolicy_id *id; |
26b15dad JHS |
1414 | struct nlmsghdr *nlh; |
1415 | struct sk_buff *skb; | |
26b15dad JHS |
1416 | unsigned char *b; |
1417 | int len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr); | |
0603eac0 HX |
1418 | int headlen; |
1419 | ||
1420 | headlen = sizeof(*p); | |
1421 | if (c->event == XFRM_MSG_DELPOLICY) { | |
1422 | len += RTA_SPACE(headlen); | |
1423 | headlen = sizeof(*id); | |
1424 | } | |
1425 | len += NLMSG_SPACE(headlen); | |
26b15dad JHS |
1426 | |
1427 | skb = alloc_skb(len, GFP_ATOMIC); | |
1428 | if (skb == NULL) | |
1429 | return -ENOMEM; | |
1430 | b = skb->tail; | |
1431 | ||
0603eac0 | 1432 | nlh = NLMSG_PUT(skb, c->pid, c->seq, c->event, headlen); |
26b15dad JHS |
1433 | |
1434 | p = NLMSG_DATA(nlh); | |
0603eac0 HX |
1435 | if (c->event == XFRM_MSG_DELPOLICY) { |
1436 | id = NLMSG_DATA(nlh); | |
1437 | memset(id, 0, sizeof(*id)); | |
1438 | id->dir = dir; | |
1439 | if (c->data.byid) | |
1440 | id->index = xp->index; | |
1441 | else | |
1442 | memcpy(&id->sel, &xp->selector, sizeof(id->sel)); | |
1443 | ||
1444 | p = RTA_DATA(__RTA_PUT(skb, XFRMA_POLICY, sizeof(*p))); | |
1445 | } | |
26b15dad JHS |
1446 | |
1447 | nlh->nlmsg_flags = 0; | |
1448 | ||
1449 | copy_to_user_policy(xp, p, dir); | |
1450 | if (copy_to_user_tmpl(xp, skb) < 0) | |
1451 | goto nlmsg_failure; | |
1452 | ||
1453 | nlh->nlmsg_len = skb->tail - b; | |
1454 | ||
1455 | return netlink_broadcast(xfrm_nl, skb, 0, XFRMGRP_POLICY, GFP_ATOMIC); | |
1456 | ||
1457 | nlmsg_failure: | |
0603eac0 | 1458 | rtattr_failure: |
26b15dad JHS |
1459 | kfree_skb(skb); |
1460 | return -1; | |
1461 | } | |
1462 | ||
1463 | static int xfrm_notify_policy_flush(struct km_event *c) | |
1464 | { | |
1465 | struct nlmsghdr *nlh; | |
1466 | struct sk_buff *skb; | |
1467 | unsigned char *b; | |
1468 | int len = NLMSG_LENGTH(0); | |
1469 | ||
1470 | skb = alloc_skb(len, GFP_ATOMIC); | |
1471 | if (skb == NULL) | |
1472 | return -ENOMEM; | |
1473 | b = skb->tail; | |
1474 | ||
1475 | ||
1476 | nlh = NLMSG_PUT(skb, c->pid, c->seq, XFRM_MSG_FLUSHPOLICY, 0); | |
1477 | ||
1478 | nlh->nlmsg_len = skb->tail - b; | |
1479 | ||
1480 | return netlink_broadcast(xfrm_nl, skb, 0, XFRMGRP_POLICY, GFP_ATOMIC); | |
1481 | ||
1482 | nlmsg_failure: | |
1483 | kfree_skb(skb); | |
1484 | return -1; | |
1485 | } | |
1486 | ||
1487 | static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c) | |
1488 | { | |
1489 | ||
1490 | switch (c->event) { | |
f60f6b8f HX |
1491 | case XFRM_MSG_NEWPOLICY: |
1492 | case XFRM_MSG_UPDPOLICY: | |
1493 | case XFRM_MSG_DELPOLICY: | |
26b15dad | 1494 | return xfrm_notify_policy(xp, dir, c); |
f60f6b8f | 1495 | case XFRM_MSG_FLUSHPOLICY: |
26b15dad | 1496 | return xfrm_notify_policy_flush(c); |
f60f6b8f | 1497 | case XFRM_MSG_POLEXPIRE: |
26b15dad JHS |
1498 | return xfrm_exp_policy_notify(xp, dir, c); |
1499 | default: | |
1500 | printk("xfrm_user: Unknown Policy event %d\n", c->event); | |
1501 | } | |
1502 | ||
1503 | return 0; | |
1504 | ||
1505 | } | |
1506 | ||
1da177e4 LT |
1507 | static struct xfrm_mgr netlink_mgr = { |
1508 | .id = "netlink", | |
1509 | .notify = xfrm_send_state_notify, | |
1510 | .acquire = xfrm_send_acquire, | |
1511 | .compile_policy = xfrm_compile_policy, | |
1512 | .notify_policy = xfrm_send_policy_notify, | |
1513 | }; | |
1514 | ||
1515 | static int __init xfrm_user_init(void) | |
1516 | { | |
1517 | printk(KERN_INFO "Initializing IPsec netlink socket\n"); | |
1518 | ||
1519 | xfrm_nl = netlink_kernel_create(NETLINK_XFRM, xfrm_netlink_rcv); | |
1520 | if (xfrm_nl == NULL) | |
1521 | return -ENOMEM; | |
1522 | ||
1523 | xfrm_register_km(&netlink_mgr); | |
1524 | ||
1525 | return 0; | |
1526 | } | |
1527 | ||
1528 | static void __exit xfrm_user_exit(void) | |
1529 | { | |
1530 | xfrm_unregister_km(&netlink_mgr); | |
1531 | sock_release(xfrm_nl->sk_socket); | |
1532 | } | |
1533 | ||
1534 | module_init(xfrm_user_init); | |
1535 | module_exit(xfrm_user_exit); | |
1536 | MODULE_LICENSE("GPL"); |