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