]>
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 | |
df71837d | 10 | * |
1da177e4 LT |
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> | |
1da177e4 LT |
21 | #include <linux/rtnetlink.h> |
22 | #include <linux/pfkeyv2.h> | |
23 | #include <linux/ipsec.h> | |
24 | #include <linux/init.h> | |
25 | #include <linux/security.h> | |
26 | #include <net/sock.h> | |
27 | #include <net/xfrm.h> | |
88fc2c84 | 28 | #include <net/netlink.h> |
1da177e4 LT |
29 | #include <asm/uaccess.h> |
30 | ||
1da177e4 LT |
31 | static int verify_one_alg(struct rtattr **xfrma, enum xfrm_attr_type_t type) |
32 | { | |
33 | struct rtattr *rt = xfrma[type - 1]; | |
34 | struct xfrm_algo *algp; | |
31c26852 | 35 | int len; |
1da177e4 LT |
36 | |
37 | if (!rt) | |
38 | return 0; | |
39 | ||
31c26852 HX |
40 | len = (rt->rta_len - sizeof(*rt)) - sizeof(*algp); |
41 | if (len < 0) | |
1da177e4 LT |
42 | return -EINVAL; |
43 | ||
44 | algp = RTA_DATA(rt); | |
31c26852 HX |
45 | |
46 | len -= (algp->alg_key_len + 7U) / 8; | |
47 | if (len < 0) | |
48 | return -EINVAL; | |
49 | ||
1da177e4 LT |
50 | switch (type) { |
51 | case XFRMA_ALG_AUTH: | |
52 | if (!algp->alg_key_len && | |
53 | strcmp(algp->alg_name, "digest_null") != 0) | |
54 | return -EINVAL; | |
55 | break; | |
56 | ||
57 | case XFRMA_ALG_CRYPT: | |
58 | if (!algp->alg_key_len && | |
59 | strcmp(algp->alg_name, "cipher_null") != 0) | |
60 | return -EINVAL; | |
61 | break; | |
62 | ||
63 | case XFRMA_ALG_COMP: | |
64 | /* Zero length keys are legal. */ | |
65 | break; | |
66 | ||
67 | default: | |
68 | return -EINVAL; | |
69 | }; | |
70 | ||
71 | algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0'; | |
72 | return 0; | |
73 | } | |
74 | ||
75 | static int verify_encap_tmpl(struct rtattr **xfrma) | |
76 | { | |
77 | struct rtattr *rt = xfrma[XFRMA_ENCAP - 1]; | |
78 | struct xfrm_encap_tmpl *encap; | |
79 | ||
80 | if (!rt) | |
81 | return 0; | |
82 | ||
83 | if ((rt->rta_len - sizeof(*rt)) < sizeof(*encap)) | |
84 | return -EINVAL; | |
85 | ||
86 | return 0; | |
87 | } | |
88 | ||
df71837d TJ |
89 | |
90 | static inline int verify_sec_ctx_len(struct rtattr **xfrma) | |
91 | { | |
92 | struct rtattr *rt = xfrma[XFRMA_SEC_CTX - 1]; | |
93 | struct xfrm_user_sec_ctx *uctx; | |
94 | int len = 0; | |
95 | ||
96 | if (!rt) | |
97 | return 0; | |
98 | ||
99 | if (rt->rta_len < sizeof(*uctx)) | |
100 | return -EINVAL; | |
101 | ||
102 | uctx = RTA_DATA(rt); | |
103 | ||
df71837d TJ |
104 | len += sizeof(struct xfrm_user_sec_ctx); |
105 | len += uctx->ctx_len; | |
106 | ||
107 | if (uctx->len != len) | |
108 | return -EINVAL; | |
109 | ||
110 | return 0; | |
111 | } | |
112 | ||
113 | ||
1da177e4 LT |
114 | static int verify_newsa_info(struct xfrm_usersa_info *p, |
115 | struct rtattr **xfrma) | |
116 | { | |
117 | int err; | |
118 | ||
119 | err = -EINVAL; | |
120 | switch (p->family) { | |
121 | case AF_INET: | |
122 | break; | |
123 | ||
124 | case AF_INET6: | |
125 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
126 | break; | |
127 | #else | |
128 | err = -EAFNOSUPPORT; | |
129 | goto out; | |
130 | #endif | |
131 | ||
132 | default: | |
133 | goto out; | |
134 | }; | |
135 | ||
136 | err = -EINVAL; | |
137 | switch (p->id.proto) { | |
138 | case IPPROTO_AH: | |
139 | if (!xfrma[XFRMA_ALG_AUTH-1] || | |
140 | xfrma[XFRMA_ALG_CRYPT-1] || | |
141 | xfrma[XFRMA_ALG_COMP-1]) | |
142 | goto out; | |
143 | break; | |
144 | ||
145 | case IPPROTO_ESP: | |
146 | if ((!xfrma[XFRMA_ALG_AUTH-1] && | |
147 | !xfrma[XFRMA_ALG_CRYPT-1]) || | |
148 | xfrma[XFRMA_ALG_COMP-1]) | |
149 | goto out; | |
150 | break; | |
151 | ||
152 | case IPPROTO_COMP: | |
153 | if (!xfrma[XFRMA_ALG_COMP-1] || | |
154 | xfrma[XFRMA_ALG_AUTH-1] || | |
155 | xfrma[XFRMA_ALG_CRYPT-1]) | |
156 | goto out; | |
157 | break; | |
158 | ||
159 | default: | |
160 | goto out; | |
161 | }; | |
162 | ||
163 | if ((err = verify_one_alg(xfrma, XFRMA_ALG_AUTH))) | |
164 | goto out; | |
165 | if ((err = verify_one_alg(xfrma, XFRMA_ALG_CRYPT))) | |
166 | goto out; | |
167 | if ((err = verify_one_alg(xfrma, XFRMA_ALG_COMP))) | |
168 | goto out; | |
169 | if ((err = verify_encap_tmpl(xfrma))) | |
170 | goto out; | |
df71837d TJ |
171 | if ((err = verify_sec_ctx_len(xfrma))) |
172 | goto out; | |
1da177e4 LT |
173 | |
174 | err = -EINVAL; | |
175 | switch (p->mode) { | |
176 | case 0: | |
177 | case 1: | |
178 | break; | |
179 | ||
180 | default: | |
181 | goto out; | |
182 | }; | |
183 | ||
184 | err = 0; | |
185 | ||
186 | out: | |
187 | return err; | |
188 | } | |
189 | ||
190 | static int attach_one_algo(struct xfrm_algo **algpp, u8 *props, | |
191 | struct xfrm_algo_desc *(*get_byname)(char *, int), | |
192 | struct rtattr *u_arg) | |
193 | { | |
194 | struct rtattr *rta = u_arg; | |
195 | struct xfrm_algo *p, *ualg; | |
196 | struct xfrm_algo_desc *algo; | |
b9e9dead | 197 | int len; |
1da177e4 LT |
198 | |
199 | if (!rta) | |
200 | return 0; | |
201 | ||
202 | ualg = RTA_DATA(rta); | |
203 | ||
204 | algo = get_byname(ualg->alg_name, 1); | |
205 | if (!algo) | |
206 | return -ENOSYS; | |
207 | *props = algo->desc.sadb_alg_id; | |
208 | ||
b9e9dead HX |
209 | len = sizeof(*ualg) + (ualg->alg_key_len + 7U) / 8; |
210 | p = kmalloc(len, GFP_KERNEL); | |
1da177e4 LT |
211 | if (!p) |
212 | return -ENOMEM; | |
213 | ||
b9e9dead | 214 | memcpy(p, ualg, len); |
1da177e4 LT |
215 | *algpp = p; |
216 | return 0; | |
217 | } | |
218 | ||
219 | static int attach_encap_tmpl(struct xfrm_encap_tmpl **encapp, struct rtattr *u_arg) | |
220 | { | |
221 | struct rtattr *rta = u_arg; | |
222 | struct xfrm_encap_tmpl *p, *uencap; | |
223 | ||
224 | if (!rta) | |
225 | return 0; | |
226 | ||
227 | uencap = RTA_DATA(rta); | |
228 | p = kmalloc(sizeof(*p), GFP_KERNEL); | |
229 | if (!p) | |
230 | return -ENOMEM; | |
231 | ||
232 | memcpy(p, uencap, sizeof(*p)); | |
233 | *encapp = p; | |
234 | return 0; | |
235 | } | |
236 | ||
df71837d TJ |
237 | |
238 | static inline int xfrm_user_sec_ctx_size(struct xfrm_policy *xp) | |
239 | { | |
240 | struct xfrm_sec_ctx *xfrm_ctx = xp->security; | |
241 | int len = 0; | |
242 | ||
243 | if (xfrm_ctx) { | |
244 | len += sizeof(struct xfrm_user_sec_ctx); | |
245 | len += xfrm_ctx->ctx_len; | |
246 | } | |
247 | return len; | |
248 | } | |
249 | ||
250 | static int attach_sec_ctx(struct xfrm_state *x, struct rtattr *u_arg) | |
251 | { | |
252 | struct xfrm_user_sec_ctx *uctx; | |
253 | ||
254 | if (!u_arg) | |
255 | return 0; | |
256 | ||
257 | uctx = RTA_DATA(u_arg); | |
258 | return security_xfrm_state_alloc(x, uctx); | |
259 | } | |
260 | ||
1da177e4 LT |
261 | static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p) |
262 | { | |
263 | memcpy(&x->id, &p->id, sizeof(x->id)); | |
264 | memcpy(&x->sel, &p->sel, sizeof(x->sel)); | |
265 | memcpy(&x->lft, &p->lft, sizeof(x->lft)); | |
266 | x->props.mode = p->mode; | |
267 | x->props.replay_window = p->replay_window; | |
268 | x->props.reqid = p->reqid; | |
269 | x->props.family = p->family; | |
270 | x->props.saddr = p->saddr; | |
271 | x->props.flags = p->flags; | |
272 | } | |
273 | ||
d51d081d JHS |
274 | /* |
275 | * someday when pfkey also has support, we could have the code | |
276 | * somehow made shareable and move it to xfrm_state.c - JHS | |
277 | * | |
278 | */ | |
279 | static int xfrm_update_ae_params(struct xfrm_state *x, struct rtattr **xfrma) | |
280 | { | |
281 | int err = - EINVAL; | |
282 | struct rtattr *rp = xfrma[XFRMA_REPLAY_VAL-1]; | |
283 | struct rtattr *lt = xfrma[XFRMA_LTIME_VAL-1]; | |
284 | struct rtattr *et = xfrma[XFRMA_ETIMER_THRESH-1]; | |
285 | struct rtattr *rt = xfrma[XFRMA_REPLAY_THRESH-1]; | |
286 | ||
287 | if (rp) { | |
288 | struct xfrm_replay_state *replay; | |
289 | if (RTA_PAYLOAD(rp) < sizeof(*replay)) | |
290 | goto error; | |
291 | replay = RTA_DATA(rp); | |
292 | memcpy(&x->replay, replay, sizeof(*replay)); | |
293 | memcpy(&x->preplay, replay, sizeof(*replay)); | |
294 | } | |
295 | ||
296 | if (lt) { | |
297 | struct xfrm_lifetime_cur *ltime; | |
298 | if (RTA_PAYLOAD(lt) < sizeof(*ltime)) | |
299 | goto error; | |
300 | ltime = RTA_DATA(lt); | |
301 | x->curlft.bytes = ltime->bytes; | |
302 | x->curlft.packets = ltime->packets; | |
303 | x->curlft.add_time = ltime->add_time; | |
304 | x->curlft.use_time = ltime->use_time; | |
305 | } | |
306 | ||
307 | if (et) { | |
308 | if (RTA_PAYLOAD(et) < sizeof(u32)) | |
309 | goto error; | |
310 | x->replay_maxage = *(u32*)RTA_DATA(et); | |
311 | } | |
312 | ||
313 | if (rt) { | |
314 | if (RTA_PAYLOAD(rt) < sizeof(u32)) | |
315 | goto error; | |
316 | x->replay_maxdiff = *(u32*)RTA_DATA(rt); | |
317 | } | |
318 | ||
319 | return 0; | |
320 | error: | |
321 | return err; | |
322 | } | |
323 | ||
1da177e4 LT |
324 | static struct xfrm_state *xfrm_state_construct(struct xfrm_usersa_info *p, |
325 | struct rtattr **xfrma, | |
326 | int *errp) | |
327 | { | |
328 | struct xfrm_state *x = xfrm_state_alloc(); | |
329 | int err = -ENOMEM; | |
330 | ||
331 | if (!x) | |
332 | goto error_no_put; | |
333 | ||
334 | copy_from_user_state(x, p); | |
335 | ||
336 | if ((err = attach_one_algo(&x->aalg, &x->props.aalgo, | |
337 | xfrm_aalg_get_byname, | |
338 | xfrma[XFRMA_ALG_AUTH-1]))) | |
339 | goto error; | |
340 | if ((err = attach_one_algo(&x->ealg, &x->props.ealgo, | |
341 | xfrm_ealg_get_byname, | |
342 | xfrma[XFRMA_ALG_CRYPT-1]))) | |
343 | goto error; | |
344 | if ((err = attach_one_algo(&x->calg, &x->props.calgo, | |
345 | xfrm_calg_get_byname, | |
346 | xfrma[XFRMA_ALG_COMP-1]))) | |
347 | goto error; | |
348 | if ((err = attach_encap_tmpl(&x->encap, xfrma[XFRMA_ENCAP-1]))) | |
349 | goto error; | |
350 | ||
72cb6962 | 351 | err = xfrm_init_state(x); |
1da177e4 LT |
352 | if (err) |
353 | goto error; | |
354 | ||
df71837d TJ |
355 | if ((err = attach_sec_ctx(x, xfrma[XFRMA_SEC_CTX-1]))) |
356 | goto error; | |
357 | ||
1da177e4 | 358 | x->km.seq = p->seq; |
d51d081d JHS |
359 | x->replay_maxdiff = sysctl_xfrm_aevent_rseqth; |
360 | /* sysctl_xfrm_aevent_etime is in 100ms units */ | |
361 | x->replay_maxage = (sysctl_xfrm_aevent_etime*HZ)/XFRM_AE_ETH_M; | |
362 | x->preplay.bitmap = 0; | |
363 | x->preplay.seq = x->replay.seq+x->replay_maxdiff; | |
364 | x->preplay.oseq = x->replay.oseq +x->replay_maxdiff; | |
365 | ||
366 | /* override default values from above */ | |
367 | ||
368 | err = xfrm_update_ae_params(x, (struct rtattr **)xfrma); | |
369 | if (err < 0) | |
370 | goto error; | |
1da177e4 LT |
371 | |
372 | return x; | |
373 | ||
374 | error: | |
375 | x->km.state = XFRM_STATE_DEAD; | |
376 | xfrm_state_put(x); | |
377 | error_no_put: | |
378 | *errp = err; | |
379 | return NULL; | |
380 | } | |
381 | ||
382 | static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma) | |
383 | { | |
384 | struct xfrm_usersa_info *p = NLMSG_DATA(nlh); | |
385 | struct xfrm_state *x; | |
386 | int err; | |
26b15dad | 387 | struct km_event c; |
1da177e4 | 388 | |
df71837d | 389 | err = verify_newsa_info(p, (struct rtattr **)xfrma); |
1da177e4 LT |
390 | if (err) |
391 | return err; | |
392 | ||
df71837d | 393 | x = xfrm_state_construct(p, (struct rtattr **)xfrma, &err); |
1da177e4 LT |
394 | if (!x) |
395 | return err; | |
396 | ||
26b15dad | 397 | xfrm_state_hold(x); |
1da177e4 LT |
398 | if (nlh->nlmsg_type == XFRM_MSG_NEWSA) |
399 | err = xfrm_state_add(x); | |
400 | else | |
401 | err = xfrm_state_update(x); | |
402 | ||
403 | if (err < 0) { | |
404 | x->km.state = XFRM_STATE_DEAD; | |
21380b81 | 405 | __xfrm_state_put(x); |
7d6dfe1f | 406 | goto out; |
1da177e4 LT |
407 | } |
408 | ||
26b15dad JHS |
409 | c.seq = nlh->nlmsg_seq; |
410 | c.pid = nlh->nlmsg_pid; | |
f60f6b8f | 411 | c.event = nlh->nlmsg_type; |
26b15dad JHS |
412 | |
413 | km_state_notify(x, &c); | |
7d6dfe1f | 414 | out: |
26b15dad | 415 | xfrm_state_put(x); |
1da177e4 LT |
416 | return err; |
417 | } | |
418 | ||
419 | static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma) | |
420 | { | |
421 | struct xfrm_state *x; | |
26b15dad JHS |
422 | int err; |
423 | struct km_event c; | |
1da177e4 LT |
424 | struct xfrm_usersa_id *p = NLMSG_DATA(nlh); |
425 | ||
426 | x = xfrm_state_lookup(&p->daddr, p->spi, p->proto, p->family); | |
427 | if (x == NULL) | |
428 | return -ESRCH; | |
429 | ||
430 | if (xfrm_state_kern(x)) { | |
431 | xfrm_state_put(x); | |
432 | return -EPERM; | |
433 | } | |
434 | ||
26b15dad JHS |
435 | err = xfrm_state_delete(x); |
436 | if (err < 0) { | |
437 | xfrm_state_put(x); | |
438 | return err; | |
439 | } | |
440 | ||
441 | c.seq = nlh->nlmsg_seq; | |
442 | c.pid = nlh->nlmsg_pid; | |
f60f6b8f | 443 | c.event = nlh->nlmsg_type; |
26b15dad | 444 | km_state_notify(x, &c); |
1da177e4 LT |
445 | xfrm_state_put(x); |
446 | ||
26b15dad | 447 | return err; |
1da177e4 LT |
448 | } |
449 | ||
450 | static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p) | |
451 | { | |
452 | memcpy(&p->id, &x->id, sizeof(p->id)); | |
453 | memcpy(&p->sel, &x->sel, sizeof(p->sel)); | |
454 | memcpy(&p->lft, &x->lft, sizeof(p->lft)); | |
455 | memcpy(&p->curlft, &x->curlft, sizeof(p->curlft)); | |
456 | memcpy(&p->stats, &x->stats, sizeof(p->stats)); | |
457 | p->saddr = x->props.saddr; | |
458 | p->mode = x->props.mode; | |
459 | p->replay_window = x->props.replay_window; | |
460 | p->reqid = x->props.reqid; | |
461 | p->family = x->props.family; | |
462 | p->flags = x->props.flags; | |
463 | p->seq = x->km.seq; | |
464 | } | |
465 | ||
466 | struct xfrm_dump_info { | |
467 | struct sk_buff *in_skb; | |
468 | struct sk_buff *out_skb; | |
469 | u32 nlmsg_seq; | |
470 | u16 nlmsg_flags; | |
471 | int start_idx; | |
472 | int this_idx; | |
473 | }; | |
474 | ||
475 | static int dump_one_state(struct xfrm_state *x, int count, void *ptr) | |
476 | { | |
477 | struct xfrm_dump_info *sp = ptr; | |
478 | struct sk_buff *in_skb = sp->in_skb; | |
479 | struct sk_buff *skb = sp->out_skb; | |
480 | struct xfrm_usersa_info *p; | |
481 | struct nlmsghdr *nlh; | |
482 | unsigned char *b = skb->tail; | |
483 | ||
484 | if (sp->this_idx < sp->start_idx) | |
485 | goto out; | |
486 | ||
487 | nlh = NLMSG_PUT(skb, NETLINK_CB(in_skb).pid, | |
488 | sp->nlmsg_seq, | |
489 | XFRM_MSG_NEWSA, sizeof(*p)); | |
490 | nlh->nlmsg_flags = sp->nlmsg_flags; | |
491 | ||
492 | p = NLMSG_DATA(nlh); | |
493 | copy_to_user_state(x, p); | |
494 | ||
495 | if (x->aalg) | |
496 | RTA_PUT(skb, XFRMA_ALG_AUTH, | |
497 | sizeof(*(x->aalg))+(x->aalg->alg_key_len+7)/8, x->aalg); | |
498 | if (x->ealg) | |
499 | RTA_PUT(skb, XFRMA_ALG_CRYPT, | |
500 | sizeof(*(x->ealg))+(x->ealg->alg_key_len+7)/8, x->ealg); | |
501 | if (x->calg) | |
502 | RTA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg); | |
503 | ||
504 | if (x->encap) | |
505 | RTA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap); | |
506 | ||
df71837d TJ |
507 | if (x->security) { |
508 | int ctx_size = sizeof(struct xfrm_sec_ctx) + | |
509 | x->security->ctx_len; | |
510 | struct rtattr *rt = __RTA_PUT(skb, XFRMA_SEC_CTX, ctx_size); | |
511 | struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt); | |
512 | ||
513 | uctx->exttype = XFRMA_SEC_CTX; | |
514 | uctx->len = ctx_size; | |
515 | uctx->ctx_doi = x->security->ctx_doi; | |
516 | uctx->ctx_alg = x->security->ctx_alg; | |
517 | uctx->ctx_len = x->security->ctx_len; | |
518 | memcpy(uctx + 1, x->security->ctx_str, x->security->ctx_len); | |
519 | } | |
1da177e4 LT |
520 | nlh->nlmsg_len = skb->tail - b; |
521 | out: | |
522 | sp->this_idx++; | |
523 | return 0; | |
524 | ||
525 | nlmsg_failure: | |
526 | rtattr_failure: | |
527 | skb_trim(skb, b - skb->data); | |
528 | return -1; | |
529 | } | |
530 | ||
531 | static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb) | |
532 | { | |
533 | struct xfrm_dump_info info; | |
534 | ||
535 | info.in_skb = cb->skb; | |
536 | info.out_skb = skb; | |
537 | info.nlmsg_seq = cb->nlh->nlmsg_seq; | |
538 | info.nlmsg_flags = NLM_F_MULTI; | |
539 | info.this_idx = 0; | |
540 | info.start_idx = cb->args[0]; | |
541 | (void) xfrm_state_walk(IPSEC_PROTO_ANY, dump_one_state, &info); | |
542 | cb->args[0] = info.this_idx; | |
543 | ||
544 | return skb->len; | |
545 | } | |
546 | ||
547 | static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb, | |
548 | struct xfrm_state *x, u32 seq) | |
549 | { | |
550 | struct xfrm_dump_info info; | |
551 | struct sk_buff *skb; | |
552 | ||
553 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC); | |
554 | if (!skb) | |
555 | return ERR_PTR(-ENOMEM); | |
556 | ||
557 | NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid; | |
558 | info.in_skb = in_skb; | |
559 | info.out_skb = skb; | |
560 | info.nlmsg_seq = seq; | |
561 | info.nlmsg_flags = 0; | |
562 | info.this_idx = info.start_idx = 0; | |
563 | ||
564 | if (dump_one_state(x, 0, &info)) { | |
565 | kfree_skb(skb); | |
566 | return NULL; | |
567 | } | |
568 | ||
569 | return skb; | |
570 | } | |
571 | ||
572 | static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma) | |
573 | { | |
574 | struct xfrm_usersa_id *p = NLMSG_DATA(nlh); | |
575 | struct xfrm_state *x; | |
576 | struct sk_buff *resp_skb; | |
577 | int err; | |
578 | ||
579 | x = xfrm_state_lookup(&p->daddr, p->spi, p->proto, p->family); | |
580 | err = -ESRCH; | |
581 | if (x == NULL) | |
582 | goto out_noput; | |
583 | ||
584 | resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); | |
585 | if (IS_ERR(resp_skb)) { | |
586 | err = PTR_ERR(resp_skb); | |
587 | } else { | |
588 | err = netlink_unicast(xfrm_nl, resp_skb, | |
589 | NETLINK_CB(skb).pid, MSG_DONTWAIT); | |
590 | } | |
591 | xfrm_state_put(x); | |
592 | out_noput: | |
593 | return err; | |
594 | } | |
595 | ||
596 | static int verify_userspi_info(struct xfrm_userspi_info *p) | |
597 | { | |
598 | switch (p->info.id.proto) { | |
599 | case IPPROTO_AH: | |
600 | case IPPROTO_ESP: | |
601 | break; | |
602 | ||
603 | case IPPROTO_COMP: | |
604 | /* IPCOMP spi is 16-bits. */ | |
605 | if (p->max >= 0x10000) | |
606 | return -EINVAL; | |
607 | break; | |
608 | ||
609 | default: | |
610 | return -EINVAL; | |
611 | }; | |
612 | ||
613 | if (p->min > p->max) | |
614 | return -EINVAL; | |
615 | ||
616 | return 0; | |
617 | } | |
618 | ||
619 | static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma) | |
620 | { | |
621 | struct xfrm_state *x; | |
622 | struct xfrm_userspi_info *p; | |
623 | struct sk_buff *resp_skb; | |
624 | xfrm_address_t *daddr; | |
625 | int family; | |
626 | int err; | |
627 | ||
628 | p = NLMSG_DATA(nlh); | |
629 | err = verify_userspi_info(p); | |
630 | if (err) | |
631 | goto out_noput; | |
632 | ||
633 | family = p->info.family; | |
634 | daddr = &p->info.id.daddr; | |
635 | ||
636 | x = NULL; | |
637 | if (p->info.seq) { | |
638 | x = xfrm_find_acq_byseq(p->info.seq); | |
639 | if (x && xfrm_addr_cmp(&x->id.daddr, daddr, family)) { | |
640 | xfrm_state_put(x); | |
641 | x = NULL; | |
642 | } | |
643 | } | |
644 | ||
645 | if (!x) | |
646 | x = xfrm_find_acq(p->info.mode, p->info.reqid, | |
647 | p->info.id.proto, daddr, | |
648 | &p->info.saddr, 1, | |
649 | family); | |
650 | err = -ENOENT; | |
651 | if (x == NULL) | |
652 | goto out_noput; | |
653 | ||
654 | resp_skb = ERR_PTR(-ENOENT); | |
655 | ||
656 | spin_lock_bh(&x->lock); | |
657 | if (x->km.state != XFRM_STATE_DEAD) { | |
658 | xfrm_alloc_spi(x, htonl(p->min), htonl(p->max)); | |
659 | if (x->id.spi) | |
660 | resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); | |
661 | } | |
662 | spin_unlock_bh(&x->lock); | |
663 | ||
664 | if (IS_ERR(resp_skb)) { | |
665 | err = PTR_ERR(resp_skb); | |
666 | goto out; | |
667 | } | |
668 | ||
669 | err = netlink_unicast(xfrm_nl, resp_skb, | |
670 | NETLINK_CB(skb).pid, MSG_DONTWAIT); | |
671 | ||
672 | out: | |
673 | xfrm_state_put(x); | |
674 | out_noput: | |
675 | return err; | |
676 | } | |
677 | ||
678 | static int verify_policy_dir(__u8 dir) | |
679 | { | |
680 | switch (dir) { | |
681 | case XFRM_POLICY_IN: | |
682 | case XFRM_POLICY_OUT: | |
683 | case XFRM_POLICY_FWD: | |
684 | break; | |
685 | ||
686 | default: | |
687 | return -EINVAL; | |
688 | }; | |
689 | ||
690 | return 0; | |
691 | } | |
692 | ||
693 | static int verify_newpolicy_info(struct xfrm_userpolicy_info *p) | |
694 | { | |
695 | switch (p->share) { | |
696 | case XFRM_SHARE_ANY: | |
697 | case XFRM_SHARE_SESSION: | |
698 | case XFRM_SHARE_USER: | |
699 | case XFRM_SHARE_UNIQUE: | |
700 | break; | |
701 | ||
702 | default: | |
703 | return -EINVAL; | |
704 | }; | |
705 | ||
706 | switch (p->action) { | |
707 | case XFRM_POLICY_ALLOW: | |
708 | case XFRM_POLICY_BLOCK: | |
709 | break; | |
710 | ||
711 | default: | |
712 | return -EINVAL; | |
713 | }; | |
714 | ||
715 | switch (p->sel.family) { | |
716 | case AF_INET: | |
717 | break; | |
718 | ||
719 | case AF_INET6: | |
720 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
721 | break; | |
722 | #else | |
723 | return -EAFNOSUPPORT; | |
724 | #endif | |
725 | ||
726 | default: | |
727 | return -EINVAL; | |
728 | }; | |
729 | ||
730 | return verify_policy_dir(p->dir); | |
731 | } | |
732 | ||
df71837d TJ |
733 | static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct rtattr **xfrma) |
734 | { | |
735 | struct rtattr *rt = xfrma[XFRMA_SEC_CTX-1]; | |
736 | struct xfrm_user_sec_ctx *uctx; | |
737 | ||
738 | if (!rt) | |
739 | return 0; | |
740 | ||
741 | uctx = RTA_DATA(rt); | |
742 | return security_xfrm_policy_alloc(pol, uctx); | |
743 | } | |
744 | ||
1da177e4 LT |
745 | static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut, |
746 | int nr) | |
747 | { | |
748 | int i; | |
749 | ||
750 | xp->xfrm_nr = nr; | |
751 | for (i = 0; i < nr; i++, ut++) { | |
752 | struct xfrm_tmpl *t = &xp->xfrm_vec[i]; | |
753 | ||
754 | memcpy(&t->id, &ut->id, sizeof(struct xfrm_id)); | |
755 | memcpy(&t->saddr, &ut->saddr, | |
756 | sizeof(xfrm_address_t)); | |
757 | t->reqid = ut->reqid; | |
758 | t->mode = ut->mode; | |
759 | t->share = ut->share; | |
760 | t->optional = ut->optional; | |
761 | t->aalgos = ut->aalgos; | |
762 | t->ealgos = ut->ealgos; | |
763 | t->calgos = ut->calgos; | |
764 | } | |
765 | } | |
766 | ||
767 | static int copy_from_user_tmpl(struct xfrm_policy *pol, struct rtattr **xfrma) | |
768 | { | |
769 | struct rtattr *rt = xfrma[XFRMA_TMPL-1]; | |
770 | struct xfrm_user_tmpl *utmpl; | |
771 | int nr; | |
772 | ||
773 | if (!rt) { | |
774 | pol->xfrm_nr = 0; | |
775 | } else { | |
776 | nr = (rt->rta_len - sizeof(*rt)) / sizeof(*utmpl); | |
777 | ||
778 | if (nr > XFRM_MAX_DEPTH) | |
779 | return -EINVAL; | |
780 | ||
781 | copy_templates(pol, RTA_DATA(rt), nr); | |
782 | } | |
783 | return 0; | |
784 | } | |
785 | ||
786 | static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p) | |
787 | { | |
788 | xp->priority = p->priority; | |
789 | xp->index = p->index; | |
790 | memcpy(&xp->selector, &p->sel, sizeof(xp->selector)); | |
791 | memcpy(&xp->lft, &p->lft, sizeof(xp->lft)); | |
792 | xp->action = p->action; | |
793 | xp->flags = p->flags; | |
794 | xp->family = p->sel.family; | |
795 | /* XXX xp->share = p->share; */ | |
796 | } | |
797 | ||
798 | static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir) | |
799 | { | |
800 | memcpy(&p->sel, &xp->selector, sizeof(p->sel)); | |
801 | memcpy(&p->lft, &xp->lft, sizeof(p->lft)); | |
802 | memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft)); | |
803 | p->priority = xp->priority; | |
804 | p->index = xp->index; | |
805 | p->sel.family = xp->family; | |
806 | p->dir = dir; | |
807 | p->action = xp->action; | |
808 | p->flags = xp->flags; | |
809 | p->share = XFRM_SHARE_ANY; /* XXX xp->share */ | |
810 | } | |
811 | ||
812 | static struct xfrm_policy *xfrm_policy_construct(struct xfrm_userpolicy_info *p, struct rtattr **xfrma, int *errp) | |
813 | { | |
814 | struct xfrm_policy *xp = xfrm_policy_alloc(GFP_KERNEL); | |
815 | int err; | |
816 | ||
817 | if (!xp) { | |
818 | *errp = -ENOMEM; | |
819 | return NULL; | |
820 | } | |
821 | ||
822 | copy_from_user_policy(xp, p); | |
df71837d TJ |
823 | |
824 | if (!(err = copy_from_user_tmpl(xp, xfrma))) | |
825 | err = copy_from_user_sec_ctx(xp, xfrma); | |
826 | ||
1da177e4 LT |
827 | if (err) { |
828 | *errp = err; | |
829 | kfree(xp); | |
830 | xp = NULL; | |
831 | } | |
832 | ||
833 | return xp; | |
834 | } | |
835 | ||
836 | static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma) | |
837 | { | |
838 | struct xfrm_userpolicy_info *p = NLMSG_DATA(nlh); | |
839 | struct xfrm_policy *xp; | |
26b15dad | 840 | struct km_event c; |
1da177e4 LT |
841 | int err; |
842 | int excl; | |
843 | ||
844 | err = verify_newpolicy_info(p); | |
df71837d TJ |
845 | if (err) |
846 | return err; | |
847 | err = verify_sec_ctx_len((struct rtattr **)xfrma); | |
1da177e4 LT |
848 | if (err) |
849 | return err; | |
850 | ||
df71837d | 851 | xp = xfrm_policy_construct(p, (struct rtattr **)xfrma, &err); |
1da177e4 LT |
852 | if (!xp) |
853 | return err; | |
854 | ||
26b15dad JHS |
855 | /* shouldnt excl be based on nlh flags?? |
856 | * Aha! this is anti-netlink really i.e more pfkey derived | |
857 | * in netlink excl is a flag and you wouldnt need | |
858 | * a type XFRM_MSG_UPDPOLICY - JHS */ | |
1da177e4 LT |
859 | excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY; |
860 | err = xfrm_policy_insert(p->dir, xp, excl); | |
861 | if (err) { | |
5f8ac64b | 862 | security_xfrm_policy_free(xp); |
1da177e4 LT |
863 | kfree(xp); |
864 | return err; | |
865 | } | |
866 | ||
f60f6b8f | 867 | c.event = nlh->nlmsg_type; |
26b15dad JHS |
868 | c.seq = nlh->nlmsg_seq; |
869 | c.pid = nlh->nlmsg_pid; | |
870 | km_policy_notify(xp, p->dir, &c); | |
871 | ||
1da177e4 LT |
872 | xfrm_pol_put(xp); |
873 | ||
874 | return 0; | |
875 | } | |
876 | ||
877 | static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb) | |
878 | { | |
879 | struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH]; | |
880 | int i; | |
881 | ||
882 | if (xp->xfrm_nr == 0) | |
883 | return 0; | |
884 | ||
885 | for (i = 0; i < xp->xfrm_nr; i++) { | |
886 | struct xfrm_user_tmpl *up = &vec[i]; | |
887 | struct xfrm_tmpl *kp = &xp->xfrm_vec[i]; | |
888 | ||
889 | memcpy(&up->id, &kp->id, sizeof(up->id)); | |
890 | up->family = xp->family; | |
891 | memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr)); | |
892 | up->reqid = kp->reqid; | |
893 | up->mode = kp->mode; | |
894 | up->share = kp->share; | |
895 | up->optional = kp->optional; | |
896 | up->aalgos = kp->aalgos; | |
897 | up->ealgos = kp->ealgos; | |
898 | up->calgos = kp->calgos; | |
899 | } | |
900 | RTA_PUT(skb, XFRMA_TMPL, | |
901 | (sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr), | |
902 | vec); | |
903 | ||
904 | return 0; | |
905 | ||
906 | rtattr_failure: | |
907 | return -1; | |
908 | } | |
909 | ||
df71837d TJ |
910 | static int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb) |
911 | { | |
912 | if (xp->security) { | |
913 | int ctx_size = sizeof(struct xfrm_sec_ctx) + | |
914 | xp->security->ctx_len; | |
915 | struct rtattr *rt = __RTA_PUT(skb, XFRMA_SEC_CTX, ctx_size); | |
916 | struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt); | |
917 | ||
918 | uctx->exttype = XFRMA_SEC_CTX; | |
919 | uctx->len = ctx_size; | |
920 | uctx->ctx_doi = xp->security->ctx_doi; | |
921 | uctx->ctx_alg = xp->security->ctx_alg; | |
922 | uctx->ctx_len = xp->security->ctx_len; | |
923 | memcpy(uctx + 1, xp->security->ctx_str, xp->security->ctx_len); | |
924 | } | |
925 | return 0; | |
926 | ||
927 | rtattr_failure: | |
928 | return -1; | |
929 | } | |
930 | ||
1da177e4 LT |
931 | static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr) |
932 | { | |
933 | struct xfrm_dump_info *sp = ptr; | |
934 | struct xfrm_userpolicy_info *p; | |
935 | struct sk_buff *in_skb = sp->in_skb; | |
936 | struct sk_buff *skb = sp->out_skb; | |
937 | struct nlmsghdr *nlh; | |
938 | unsigned char *b = skb->tail; | |
939 | ||
940 | if (sp->this_idx < sp->start_idx) | |
941 | goto out; | |
942 | ||
943 | nlh = NLMSG_PUT(skb, NETLINK_CB(in_skb).pid, | |
944 | sp->nlmsg_seq, | |
945 | XFRM_MSG_NEWPOLICY, sizeof(*p)); | |
946 | p = NLMSG_DATA(nlh); | |
947 | nlh->nlmsg_flags = sp->nlmsg_flags; | |
948 | ||
949 | copy_to_user_policy(xp, p, dir); | |
950 | if (copy_to_user_tmpl(xp, skb) < 0) | |
951 | goto nlmsg_failure; | |
df71837d TJ |
952 | if (copy_to_user_sec_ctx(xp, skb)) |
953 | goto nlmsg_failure; | |
1da177e4 LT |
954 | |
955 | nlh->nlmsg_len = skb->tail - b; | |
956 | out: | |
957 | sp->this_idx++; | |
958 | return 0; | |
959 | ||
960 | nlmsg_failure: | |
961 | skb_trim(skb, b - skb->data); | |
962 | return -1; | |
963 | } | |
964 | ||
965 | static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb) | |
966 | { | |
967 | struct xfrm_dump_info info; | |
968 | ||
969 | info.in_skb = cb->skb; | |
970 | info.out_skb = skb; | |
971 | info.nlmsg_seq = cb->nlh->nlmsg_seq; | |
972 | info.nlmsg_flags = NLM_F_MULTI; | |
973 | info.this_idx = 0; | |
974 | info.start_idx = cb->args[0]; | |
975 | (void) xfrm_policy_walk(dump_one_policy, &info); | |
976 | cb->args[0] = info.this_idx; | |
977 | ||
978 | return skb->len; | |
979 | } | |
980 | ||
981 | static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb, | |
982 | struct xfrm_policy *xp, | |
983 | int dir, u32 seq) | |
984 | { | |
985 | struct xfrm_dump_info info; | |
986 | struct sk_buff *skb; | |
987 | ||
988 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
989 | if (!skb) | |
990 | return ERR_PTR(-ENOMEM); | |
991 | ||
992 | NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid; | |
993 | info.in_skb = in_skb; | |
994 | info.out_skb = skb; | |
995 | info.nlmsg_seq = seq; | |
996 | info.nlmsg_flags = 0; | |
997 | info.this_idx = info.start_idx = 0; | |
998 | ||
999 | if (dump_one_policy(xp, dir, 0, &info) < 0) { | |
1000 | kfree_skb(skb); | |
1001 | return NULL; | |
1002 | } | |
1003 | ||
1004 | return skb; | |
1005 | } | |
1006 | ||
1007 | static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma) | |
1008 | { | |
1009 | struct xfrm_policy *xp; | |
1010 | struct xfrm_userpolicy_id *p; | |
1011 | int err; | |
26b15dad | 1012 | struct km_event c; |
1da177e4 LT |
1013 | int delete; |
1014 | ||
1015 | p = NLMSG_DATA(nlh); | |
1016 | delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY; | |
1017 | ||
1018 | err = verify_policy_dir(p->dir); | |
1019 | if (err) | |
1020 | return err; | |
1021 | ||
1022 | if (p->index) | |
1023 | xp = xfrm_policy_byid(p->dir, p->index, delete); | |
df71837d TJ |
1024 | else { |
1025 | struct rtattr **rtattrs = (struct rtattr **)xfrma; | |
1026 | struct rtattr *rt = rtattrs[XFRMA_SEC_CTX-1]; | |
1027 | struct xfrm_policy tmp; | |
1028 | ||
1029 | err = verify_sec_ctx_len(rtattrs); | |
1030 | if (err) | |
1031 | return err; | |
1032 | ||
1033 | memset(&tmp, 0, sizeof(struct xfrm_policy)); | |
1034 | if (rt) { | |
1035 | struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt); | |
1036 | ||
1037 | if ((err = security_xfrm_policy_alloc(&tmp, uctx))) | |
1038 | return err; | |
1039 | } | |
1040 | xp = xfrm_policy_bysel_ctx(p->dir, &p->sel, tmp.security, delete); | |
1041 | security_xfrm_policy_free(&tmp); | |
1042 | } | |
1da177e4 LT |
1043 | if (xp == NULL) |
1044 | return -ENOENT; | |
1045 | ||
1046 | if (!delete) { | |
1047 | struct sk_buff *resp_skb; | |
1048 | ||
1049 | resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq); | |
1050 | if (IS_ERR(resp_skb)) { | |
1051 | err = PTR_ERR(resp_skb); | |
1052 | } else { | |
1053 | err = netlink_unicast(xfrm_nl, resp_skb, | |
1054 | NETLINK_CB(skb).pid, | |
1055 | MSG_DONTWAIT); | |
1056 | } | |
26b15dad | 1057 | } else { |
e7443892 | 1058 | c.data.byid = p->index; |
f60f6b8f | 1059 | c.event = nlh->nlmsg_type; |
26b15dad JHS |
1060 | c.seq = nlh->nlmsg_seq; |
1061 | c.pid = nlh->nlmsg_pid; | |
1062 | km_policy_notify(xp, p->dir, &c); | |
1da177e4 LT |
1063 | } |
1064 | ||
1065 | xfrm_pol_put(xp); | |
1066 | ||
1067 | return err; | |
1068 | } | |
1069 | ||
1070 | static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma) | |
1071 | { | |
26b15dad | 1072 | struct km_event c; |
1da177e4 LT |
1073 | struct xfrm_usersa_flush *p = NLMSG_DATA(nlh); |
1074 | ||
1075 | xfrm_state_flush(p->proto); | |
bf08867f | 1076 | c.data.proto = p->proto; |
f60f6b8f | 1077 | c.event = nlh->nlmsg_type; |
26b15dad JHS |
1078 | c.seq = nlh->nlmsg_seq; |
1079 | c.pid = nlh->nlmsg_pid; | |
1080 | km_state_notify(NULL, &c); | |
1081 | ||
1da177e4 LT |
1082 | return 0; |
1083 | } | |
1084 | ||
d51d081d JHS |
1085 | |
1086 | static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c) | |
1087 | { | |
1088 | struct xfrm_aevent_id *id; | |
1089 | struct nlmsghdr *nlh; | |
1090 | struct xfrm_lifetime_cur ltime; | |
1091 | unsigned char *b = skb->tail; | |
1092 | ||
1093 | nlh = NLMSG_PUT(skb, c->pid, c->seq, XFRM_MSG_NEWAE, sizeof(*id)); | |
1094 | id = NLMSG_DATA(nlh); | |
1095 | nlh->nlmsg_flags = 0; | |
1096 | ||
1097 | id->sa_id.daddr = x->id.daddr; | |
1098 | id->sa_id.spi = x->id.spi; | |
1099 | id->sa_id.family = x->props.family; | |
1100 | id->sa_id.proto = x->id.proto; | |
1101 | id->flags = c->data.aevent; | |
1102 | ||
1103 | RTA_PUT(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), &x->replay); | |
1104 | ||
1105 | ltime.bytes = x->curlft.bytes; | |
1106 | ltime.packets = x->curlft.packets; | |
1107 | ltime.add_time = x->curlft.add_time; | |
1108 | ltime.use_time = x->curlft.use_time; | |
1109 | ||
1110 | RTA_PUT(skb, XFRMA_LTIME_VAL, sizeof(struct xfrm_lifetime_cur), <ime); | |
1111 | ||
1112 | if (id->flags&XFRM_AE_RTHR) { | |
1113 | RTA_PUT(skb,XFRMA_REPLAY_THRESH,sizeof(u32),&x->replay_maxdiff); | |
1114 | } | |
1115 | ||
1116 | if (id->flags&XFRM_AE_ETHR) { | |
1117 | u32 etimer = x->replay_maxage*10/HZ; | |
1118 | RTA_PUT(skb,XFRMA_ETIMER_THRESH,sizeof(u32),&etimer); | |
1119 | } | |
1120 | ||
1121 | nlh->nlmsg_len = skb->tail - b; | |
1122 | return skb->len; | |
1123 | ||
1124 | rtattr_failure: | |
1125 | nlmsg_failure: | |
1126 | skb_trim(skb, b - skb->data); | |
1127 | return -1; | |
1128 | } | |
1129 | ||
1130 | static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma) | |
1131 | { | |
1132 | struct xfrm_state *x; | |
1133 | struct sk_buff *r_skb; | |
1134 | int err; | |
1135 | struct km_event c; | |
1136 | struct xfrm_aevent_id *p = NLMSG_DATA(nlh); | |
1137 | int len = NLMSG_LENGTH(sizeof(struct xfrm_aevent_id)); | |
1138 | struct xfrm_usersa_id *id = &p->sa_id; | |
1139 | ||
1140 | len += RTA_SPACE(sizeof(struct xfrm_replay_state)); | |
1141 | len += RTA_SPACE(sizeof(struct xfrm_lifetime_cur)); | |
1142 | ||
1143 | if (p->flags&XFRM_AE_RTHR) | |
1144 | len+=RTA_SPACE(sizeof(u32)); | |
1145 | ||
1146 | if (p->flags&XFRM_AE_ETHR) | |
1147 | len+=RTA_SPACE(sizeof(u32)); | |
1148 | ||
1149 | r_skb = alloc_skb(len, GFP_ATOMIC); | |
1150 | if (r_skb == NULL) | |
1151 | return -ENOMEM; | |
1152 | ||
1153 | x = xfrm_state_lookup(&id->daddr, id->spi, id->proto, id->family); | |
1154 | if (x == NULL) { | |
1155 | kfree(r_skb); | |
1156 | return -ESRCH; | |
1157 | } | |
1158 | ||
1159 | /* | |
1160 | * XXX: is this lock really needed - none of the other | |
1161 | * gets lock (the concern is things getting updated | |
1162 | * while we are still reading) - jhs | |
1163 | */ | |
1164 | spin_lock_bh(&x->lock); | |
1165 | c.data.aevent = p->flags; | |
1166 | c.seq = nlh->nlmsg_seq; | |
1167 | c.pid = nlh->nlmsg_pid; | |
1168 | ||
1169 | if (build_aevent(r_skb, x, &c) < 0) | |
1170 | BUG(); | |
1171 | err = netlink_unicast(xfrm_nl, r_skb, | |
1172 | NETLINK_CB(skb).pid, MSG_DONTWAIT); | |
1173 | spin_unlock_bh(&x->lock); | |
1174 | xfrm_state_put(x); | |
1175 | return err; | |
1176 | } | |
1177 | ||
1178 | static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma) | |
1179 | { | |
1180 | struct xfrm_state *x; | |
1181 | struct km_event c; | |
1182 | int err = - EINVAL; | |
1183 | struct xfrm_aevent_id *p = NLMSG_DATA(nlh); | |
1184 | struct rtattr *rp = xfrma[XFRMA_REPLAY_VAL-1]; | |
1185 | struct rtattr *lt = xfrma[XFRMA_LTIME_VAL-1]; | |
1186 | ||
1187 | if (!lt && !rp) | |
1188 | return err; | |
1189 | ||
1190 | /* pedantic mode - thou shalt sayeth replaceth */ | |
1191 | if (!(nlh->nlmsg_flags&NLM_F_REPLACE)) | |
1192 | return err; | |
1193 | ||
1194 | x = xfrm_state_lookup(&p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family); | |
1195 | if (x == NULL) | |
1196 | return -ESRCH; | |
1197 | ||
1198 | if (x->km.state != XFRM_STATE_VALID) | |
1199 | goto out; | |
1200 | ||
1201 | spin_lock_bh(&x->lock); | |
1202 | err = xfrm_update_ae_params(x,(struct rtattr **)xfrma); | |
1203 | spin_unlock_bh(&x->lock); | |
1204 | if (err < 0) | |
1205 | goto out; | |
1206 | ||
1207 | c.event = nlh->nlmsg_type; | |
1208 | c.seq = nlh->nlmsg_seq; | |
1209 | c.pid = nlh->nlmsg_pid; | |
1210 | c.data.aevent = XFRM_AE_CU; | |
1211 | km_state_notify(x, &c); | |
1212 | err = 0; | |
1213 | out: | |
1214 | xfrm_state_put(x); | |
1215 | return err; | |
1216 | } | |
1217 | ||
1da177e4 LT |
1218 | static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma) |
1219 | { | |
6c5c8ca7 | 1220 | struct km_event c; |
26b15dad | 1221 | |
1da177e4 | 1222 | xfrm_policy_flush(); |
f60f6b8f | 1223 | c.event = nlh->nlmsg_type; |
26b15dad JHS |
1224 | c.seq = nlh->nlmsg_seq; |
1225 | c.pid = nlh->nlmsg_pid; | |
1226 | km_policy_notify(NULL, 0, &c); | |
1da177e4 LT |
1227 | return 0; |
1228 | } | |
1229 | ||
6c5c8ca7 JHS |
1230 | static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma) |
1231 | { | |
1232 | struct xfrm_policy *xp; | |
1233 | struct xfrm_user_polexpire *up = NLMSG_DATA(nlh); | |
1234 | struct xfrm_userpolicy_info *p = &up->pol; | |
1235 | int err = -ENOENT; | |
1236 | ||
1237 | if (p->index) | |
1238 | xp = xfrm_policy_byid(p->dir, p->index, 0); | |
1239 | else { | |
1240 | struct rtattr **rtattrs = (struct rtattr **)xfrma; | |
1241 | struct rtattr *rt = rtattrs[XFRMA_SEC_CTX-1]; | |
1242 | struct xfrm_policy tmp; | |
1243 | ||
1244 | err = verify_sec_ctx_len(rtattrs); | |
1245 | if (err) | |
1246 | return err; | |
1247 | ||
1248 | memset(&tmp, 0, sizeof(struct xfrm_policy)); | |
1249 | if (rt) { | |
1250 | struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt); | |
1251 | ||
1252 | if ((err = security_xfrm_policy_alloc(&tmp, uctx))) | |
1253 | return err; | |
1254 | } | |
1255 | xp = xfrm_policy_bysel_ctx(p->dir, &p->sel, tmp.security, 0); | |
1256 | security_xfrm_policy_free(&tmp); | |
1257 | } | |
1258 | ||
1259 | if (xp == NULL) | |
1260 | return err; | |
1261 | read_lock(&xp->lock); | |
1262 | if (xp->dead) { | |
1263 | read_unlock(&xp->lock); | |
1264 | goto out; | |
1265 | } | |
1266 | ||
1267 | read_unlock(&xp->lock); | |
1268 | err = 0; | |
1269 | if (up->hard) { | |
1270 | xfrm_policy_delete(xp, p->dir); | |
1271 | } else { | |
1272 | // reset the timers here? | |
1273 | printk("Dont know what to do with soft policy expire\n"); | |
1274 | } | |
1275 | km_policy_expired(xp, p->dir, up->hard, current->pid); | |
1276 | ||
1277 | out: | |
1278 | xfrm_pol_put(xp); | |
1279 | return err; | |
1280 | } | |
1281 | ||
53bc6b4d JHS |
1282 | static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma) |
1283 | { | |
1284 | struct xfrm_state *x; | |
1285 | int err; | |
1286 | struct xfrm_user_expire *ue = NLMSG_DATA(nlh); | |
1287 | struct xfrm_usersa_info *p = &ue->state; | |
1288 | ||
1289 | x = xfrm_state_lookup(&p->id.daddr, p->id.spi, p->id.proto, p->family); | |
1290 | err = -ENOENT; | |
1291 | ||
1292 | if (x == NULL) | |
1293 | return err; | |
1294 | ||
1295 | err = -EINVAL; | |
1296 | ||
1297 | spin_lock_bh(&x->lock); | |
1298 | if (x->km.state != XFRM_STATE_VALID) | |
1299 | goto out; | |
1300 | km_state_expired(x, ue->hard, current->pid); | |
1301 | ||
1302 | if (ue->hard) | |
1303 | __xfrm_state_delete(x); | |
1304 | out: | |
1305 | spin_unlock_bh(&x->lock); | |
1306 | xfrm_state_put(x); | |
1307 | return err; | |
1308 | } | |
1309 | ||
980ebd25 JHS |
1310 | static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma) |
1311 | { | |
1312 | struct xfrm_policy *xp; | |
1313 | struct xfrm_user_tmpl *ut; | |
1314 | int i; | |
1315 | struct rtattr *rt = xfrma[XFRMA_TMPL-1]; | |
1316 | ||
1317 | struct xfrm_user_acquire *ua = NLMSG_DATA(nlh); | |
1318 | struct xfrm_state *x = xfrm_state_alloc(); | |
1319 | int err = -ENOMEM; | |
1320 | ||
1321 | if (!x) | |
1322 | return err; | |
1323 | ||
1324 | err = verify_newpolicy_info(&ua->policy); | |
1325 | if (err) { | |
1326 | printk("BAD policy passed\n"); | |
1327 | kfree(x); | |
1328 | return err; | |
1329 | } | |
1330 | ||
1331 | /* build an XP */ | |
1332 | xp = xfrm_policy_construct(&ua->policy, (struct rtattr **) xfrma, &err); if (!xp) { | |
1333 | kfree(x); | |
1334 | return err; | |
1335 | } | |
1336 | ||
1337 | memcpy(&x->id, &ua->id, sizeof(ua->id)); | |
1338 | memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr)); | |
1339 | memcpy(&x->sel, &ua->sel, sizeof(ua->sel)); | |
1340 | ||
1341 | ut = RTA_DATA(rt); | |
1342 | /* extract the templates and for each call km_key */ | |
1343 | for (i = 0; i < xp->xfrm_nr; i++, ut++) { | |
1344 | struct xfrm_tmpl *t = &xp->xfrm_vec[i]; | |
1345 | memcpy(&x->id, &t->id, sizeof(x->id)); | |
1346 | x->props.mode = t->mode; | |
1347 | x->props.reqid = t->reqid; | |
1348 | x->props.family = ut->family; | |
1349 | t->aalgos = ua->aalgos; | |
1350 | t->ealgos = ua->ealgos; | |
1351 | t->calgos = ua->calgos; | |
1352 | err = km_query(x, t, xp); | |
1353 | ||
1354 | } | |
1355 | ||
1356 | kfree(x); | |
1357 | kfree(xp); | |
1358 | ||
1359 | return 0; | |
1360 | } | |
1361 | ||
d51d081d | 1362 | |
492b558b TG |
1363 | #define XMSGSIZE(type) NLMSG_LENGTH(sizeof(struct type)) |
1364 | ||
1365 | static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = { | |
1366 | [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), | |
1367 | [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), | |
1368 | [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), | |
1369 | [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), | |
1370 | [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), | |
1371 | [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), | |
1372 | [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info), | |
980ebd25 | 1373 | [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire), |
53bc6b4d | 1374 | [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire), |
492b558b TG |
1375 | [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), |
1376 | [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), | |
6c5c8ca7 | 1377 | [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire), |
492b558b TG |
1378 | [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush), |
1379 | [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = NLMSG_LENGTH(0), | |
d51d081d JHS |
1380 | [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), |
1381 | [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), | |
1da177e4 LT |
1382 | }; |
1383 | ||
492b558b TG |
1384 | #undef XMSGSIZE |
1385 | ||
1da177e4 LT |
1386 | static struct xfrm_link { |
1387 | int (*doit)(struct sk_buff *, struct nlmsghdr *, void **); | |
1388 | int (*dump)(struct sk_buff *, struct netlink_callback *); | |
492b558b TG |
1389 | } xfrm_dispatch[XFRM_NR_MSGTYPES] = { |
1390 | [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, | |
1391 | [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa }, | |
1392 | [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa, | |
1393 | .dump = xfrm_dump_sa }, | |
1394 | [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, | |
1395 | [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy }, | |
1396 | [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy, | |
1397 | .dump = xfrm_dump_policy }, | |
1398 | [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi }, | |
980ebd25 | 1399 | [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire }, |
53bc6b4d | 1400 | [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire }, |
492b558b TG |
1401 | [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, |
1402 | [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, | |
6c5c8ca7 | 1403 | [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire}, |
492b558b TG |
1404 | [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa }, |
1405 | [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy }, | |
d51d081d JHS |
1406 | [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae }, |
1407 | [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae }, | |
1da177e4 LT |
1408 | }; |
1409 | ||
1da177e4 LT |
1410 | static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, int *errp) |
1411 | { | |
1412 | struct rtattr *xfrma[XFRMA_MAX]; | |
1413 | struct xfrm_link *link; | |
1414 | int type, min_len; | |
1415 | ||
1416 | if (!(nlh->nlmsg_flags & NLM_F_REQUEST)) | |
1417 | return 0; | |
1418 | ||
1419 | type = nlh->nlmsg_type; | |
1420 | ||
1421 | /* A control message: ignore them */ | |
1422 | if (type < XFRM_MSG_BASE) | |
1423 | return 0; | |
1424 | ||
1425 | /* Unknown message: reply with EINVAL */ | |
1426 | if (type > XFRM_MSG_MAX) | |
1427 | goto err_einval; | |
1428 | ||
1429 | type -= XFRM_MSG_BASE; | |
1430 | link = &xfrm_dispatch[type]; | |
1431 | ||
1432 | /* All operations require privileges, even GET */ | |
1433 | if (security_netlink_recv(skb)) { | |
1434 | *errp = -EPERM; | |
1435 | return -1; | |
1436 | } | |
1437 | ||
492b558b TG |
1438 | if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) || |
1439 | type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) && | |
1440 | (nlh->nlmsg_flags & NLM_F_DUMP)) { | |
1da177e4 LT |
1441 | if (link->dump == NULL) |
1442 | goto err_einval; | |
1443 | ||
1444 | if ((*errp = netlink_dump_start(xfrm_nl, skb, nlh, | |
a8f74b22 | 1445 | link->dump, NULL)) != 0) { |
1da177e4 LT |
1446 | return -1; |
1447 | } | |
88fc2c84 TG |
1448 | |
1449 | netlink_queue_skip(nlh, skb); | |
1da177e4 LT |
1450 | return -1; |
1451 | } | |
1452 | ||
1453 | memset(xfrma, 0, sizeof(xfrma)); | |
1454 | ||
1455 | if (nlh->nlmsg_len < (min_len = xfrm_msg_min[type])) | |
1456 | goto err_einval; | |
1457 | ||
1458 | if (nlh->nlmsg_len > min_len) { | |
1459 | int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len); | |
1460 | struct rtattr *attr = (void *) nlh + NLMSG_ALIGN(min_len); | |
1461 | ||
1462 | while (RTA_OK(attr, attrlen)) { | |
1463 | unsigned short flavor = attr->rta_type; | |
1464 | if (flavor) { | |
1465 | if (flavor > XFRMA_MAX) | |
1466 | goto err_einval; | |
1467 | xfrma[flavor - 1] = attr; | |
1468 | } | |
1469 | attr = RTA_NEXT(attr, attrlen); | |
1470 | } | |
1471 | } | |
1472 | ||
1473 | if (link->doit == NULL) | |
1474 | goto err_einval; | |
1475 | *errp = link->doit(skb, nlh, (void **) &xfrma); | |
1476 | ||
1477 | return *errp; | |
1478 | ||
1479 | err_einval: | |
1480 | *errp = -EINVAL; | |
1481 | return -1; | |
1482 | } | |
1483 | ||
1da177e4 LT |
1484 | static void xfrm_netlink_rcv(struct sock *sk, int len) |
1485 | { | |
88fc2c84 | 1486 | unsigned int qlen = 0; |
2a0a6ebe | 1487 | |
1da177e4 | 1488 | do { |
1da177e4 | 1489 | down(&xfrm_cfg_sem); |
88fc2c84 | 1490 | netlink_run_queue(sk, &qlen, &xfrm_user_rcv_msg); |
1da177e4 LT |
1491 | up(&xfrm_cfg_sem); |
1492 | ||
2a0a6ebe | 1493 | } while (qlen); |
1da177e4 LT |
1494 | } |
1495 | ||
d51d081d | 1496 | static int build_expire(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c) |
1da177e4 LT |
1497 | { |
1498 | struct xfrm_user_expire *ue; | |
1499 | struct nlmsghdr *nlh; | |
1500 | unsigned char *b = skb->tail; | |
1501 | ||
d51d081d | 1502 | nlh = NLMSG_PUT(skb, c->pid, 0, XFRM_MSG_EXPIRE, |
1da177e4 LT |
1503 | sizeof(*ue)); |
1504 | ue = NLMSG_DATA(nlh); | |
1505 | nlh->nlmsg_flags = 0; | |
1506 | ||
1507 | copy_to_user_state(x, &ue->state); | |
d51d081d | 1508 | ue->hard = (c->data.hard != 0) ? 1 : 0; |
1da177e4 LT |
1509 | |
1510 | nlh->nlmsg_len = skb->tail - b; | |
1511 | return skb->len; | |
1512 | ||
1513 | nlmsg_failure: | |
1514 | skb_trim(skb, b - skb->data); | |
1515 | return -1; | |
1516 | } | |
1517 | ||
26b15dad | 1518 | static int xfrm_exp_state_notify(struct xfrm_state *x, struct km_event *c) |
1da177e4 LT |
1519 | { |
1520 | struct sk_buff *skb; | |
ee57eef9 | 1521 | int len = NLMSG_LENGTH(sizeof(struct xfrm_user_expire)); |
1da177e4 | 1522 | |
ee57eef9 | 1523 | skb = alloc_skb(len, GFP_ATOMIC); |
1da177e4 LT |
1524 | if (skb == NULL) |
1525 | return -ENOMEM; | |
1526 | ||
d51d081d | 1527 | if (build_expire(skb, x, c) < 0) |
1da177e4 LT |
1528 | BUG(); |
1529 | ||
ac6d439d PM |
1530 | NETLINK_CB(skb).dst_group = XFRMNLGRP_EXPIRE; |
1531 | return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC); | |
1da177e4 LT |
1532 | } |
1533 | ||
d51d081d JHS |
1534 | static int xfrm_aevent_state_notify(struct xfrm_state *x, struct km_event *c) |
1535 | { | |
1536 | struct sk_buff *skb; | |
1537 | int len = NLMSG_LENGTH(sizeof(struct xfrm_aevent_id)); | |
1538 | ||
1539 | len += RTA_SPACE(sizeof(struct xfrm_replay_state)); | |
1540 | len += RTA_SPACE(sizeof(struct xfrm_lifetime_cur)); | |
1541 | skb = alloc_skb(len, GFP_ATOMIC); | |
1542 | if (skb == NULL) | |
1543 | return -ENOMEM; | |
1544 | ||
1545 | if (build_aevent(skb, x, c) < 0) | |
1546 | BUG(); | |
1547 | ||
1548 | NETLINK_CB(skb).dst_group = XFRMNLGRP_AEVENTS; | |
1549 | return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_AEVENTS, GFP_ATOMIC); | |
1550 | } | |
1551 | ||
26b15dad JHS |
1552 | static int xfrm_notify_sa_flush(struct km_event *c) |
1553 | { | |
1554 | struct xfrm_usersa_flush *p; | |
1555 | struct nlmsghdr *nlh; | |
1556 | struct sk_buff *skb; | |
1557 | unsigned char *b; | |
1558 | int len = NLMSG_LENGTH(sizeof(struct xfrm_usersa_flush)); | |
1559 | ||
1560 | skb = alloc_skb(len, GFP_ATOMIC); | |
1561 | if (skb == NULL) | |
1562 | return -ENOMEM; | |
1563 | b = skb->tail; | |
1564 | ||
1565 | nlh = NLMSG_PUT(skb, c->pid, c->seq, | |
1566 | XFRM_MSG_FLUSHSA, sizeof(*p)); | |
1567 | nlh->nlmsg_flags = 0; | |
1568 | ||
1569 | p = NLMSG_DATA(nlh); | |
bf08867f | 1570 | p->proto = c->data.proto; |
26b15dad JHS |
1571 | |
1572 | nlh->nlmsg_len = skb->tail - b; | |
1573 | ||
ac6d439d PM |
1574 | NETLINK_CB(skb).dst_group = XFRMNLGRP_SA; |
1575 | return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC); | |
26b15dad JHS |
1576 | |
1577 | nlmsg_failure: | |
1578 | kfree_skb(skb); | |
1579 | return -1; | |
1580 | } | |
1581 | ||
1582 | static int inline xfrm_sa_len(struct xfrm_state *x) | |
1583 | { | |
0603eac0 | 1584 | int l = 0; |
26b15dad JHS |
1585 | if (x->aalg) |
1586 | l += RTA_SPACE(sizeof(*x->aalg) + (x->aalg->alg_key_len+7)/8); | |
1587 | if (x->ealg) | |
1588 | l += RTA_SPACE(sizeof(*x->ealg) + (x->ealg->alg_key_len+7)/8); | |
1589 | if (x->calg) | |
1590 | l += RTA_SPACE(sizeof(*x->calg)); | |
1591 | if (x->encap) | |
1592 | l += RTA_SPACE(sizeof(*x->encap)); | |
1593 | ||
1594 | return l; | |
1595 | } | |
1596 | ||
1597 | static int xfrm_notify_sa(struct xfrm_state *x, struct km_event *c) | |
1598 | { | |
1599 | struct xfrm_usersa_info *p; | |
0603eac0 | 1600 | struct xfrm_usersa_id *id; |
26b15dad JHS |
1601 | struct nlmsghdr *nlh; |
1602 | struct sk_buff *skb; | |
26b15dad JHS |
1603 | unsigned char *b; |
1604 | int len = xfrm_sa_len(x); | |
0603eac0 HX |
1605 | int headlen; |
1606 | ||
1607 | headlen = sizeof(*p); | |
1608 | if (c->event == XFRM_MSG_DELSA) { | |
1609 | len += RTA_SPACE(headlen); | |
1610 | headlen = sizeof(*id); | |
1611 | } | |
1612 | len += NLMSG_SPACE(headlen); | |
26b15dad JHS |
1613 | |
1614 | skb = alloc_skb(len, GFP_ATOMIC); | |
1615 | if (skb == NULL) | |
1616 | return -ENOMEM; | |
1617 | b = skb->tail; | |
1618 | ||
0603eac0 | 1619 | nlh = NLMSG_PUT(skb, c->pid, c->seq, c->event, headlen); |
26b15dad JHS |
1620 | nlh->nlmsg_flags = 0; |
1621 | ||
1622 | p = NLMSG_DATA(nlh); | |
0603eac0 HX |
1623 | if (c->event == XFRM_MSG_DELSA) { |
1624 | id = NLMSG_DATA(nlh); | |
1625 | memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr)); | |
1626 | id->spi = x->id.spi; | |
1627 | id->family = x->props.family; | |
1628 | id->proto = x->id.proto; | |
1629 | ||
1630 | p = RTA_DATA(__RTA_PUT(skb, XFRMA_SA, sizeof(*p))); | |
1631 | } | |
1632 | ||
26b15dad JHS |
1633 | copy_to_user_state(x, p); |
1634 | ||
1635 | if (x->aalg) | |
1636 | RTA_PUT(skb, XFRMA_ALG_AUTH, | |
1637 | sizeof(*(x->aalg))+(x->aalg->alg_key_len+7)/8, x->aalg); | |
1638 | if (x->ealg) | |
1639 | RTA_PUT(skb, XFRMA_ALG_CRYPT, | |
1640 | sizeof(*(x->ealg))+(x->ealg->alg_key_len+7)/8, x->ealg); | |
1641 | if (x->calg) | |
1642 | RTA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg); | |
1643 | ||
1644 | if (x->encap) | |
1645 | RTA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap); | |
1646 | ||
1647 | nlh->nlmsg_len = skb->tail - b; | |
1648 | ||
ac6d439d PM |
1649 | NETLINK_CB(skb).dst_group = XFRMNLGRP_SA; |
1650 | return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC); | |
26b15dad JHS |
1651 | |
1652 | nlmsg_failure: | |
1653 | rtattr_failure: | |
1654 | kfree_skb(skb); | |
1655 | return -1; | |
1656 | } | |
1657 | ||
1658 | static int xfrm_send_state_notify(struct xfrm_state *x, struct km_event *c) | |
1659 | { | |
1660 | ||
1661 | switch (c->event) { | |
f60f6b8f | 1662 | case XFRM_MSG_EXPIRE: |
26b15dad | 1663 | return xfrm_exp_state_notify(x, c); |
d51d081d JHS |
1664 | case XFRM_MSG_NEWAE: |
1665 | return xfrm_aevent_state_notify(x, c); | |
f60f6b8f HX |
1666 | case XFRM_MSG_DELSA: |
1667 | case XFRM_MSG_UPDSA: | |
1668 | case XFRM_MSG_NEWSA: | |
26b15dad | 1669 | return xfrm_notify_sa(x, c); |
f60f6b8f | 1670 | case XFRM_MSG_FLUSHSA: |
26b15dad JHS |
1671 | return xfrm_notify_sa_flush(c); |
1672 | default: | |
1673 | printk("xfrm_user: Unknown SA event %d\n", c->event); | |
1674 | break; | |
1675 | } | |
1676 | ||
1677 | return 0; | |
1678 | ||
1679 | } | |
1680 | ||
1da177e4 LT |
1681 | static int build_acquire(struct sk_buff *skb, struct xfrm_state *x, |
1682 | struct xfrm_tmpl *xt, struct xfrm_policy *xp, | |
1683 | int dir) | |
1684 | { | |
1685 | struct xfrm_user_acquire *ua; | |
1686 | struct nlmsghdr *nlh; | |
1687 | unsigned char *b = skb->tail; | |
1688 | __u32 seq = xfrm_get_acqseq(); | |
1689 | ||
1690 | nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_ACQUIRE, | |
1691 | sizeof(*ua)); | |
1692 | ua = NLMSG_DATA(nlh); | |
1693 | nlh->nlmsg_flags = 0; | |
1694 | ||
1695 | memcpy(&ua->id, &x->id, sizeof(ua->id)); | |
1696 | memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr)); | |
1697 | memcpy(&ua->sel, &x->sel, sizeof(ua->sel)); | |
1698 | copy_to_user_policy(xp, &ua->policy, dir); | |
1699 | ua->aalgos = xt->aalgos; | |
1700 | ua->ealgos = xt->ealgos; | |
1701 | ua->calgos = xt->calgos; | |
1702 | ua->seq = x->km.seq = seq; | |
1703 | ||
1704 | if (copy_to_user_tmpl(xp, skb) < 0) | |
1705 | goto nlmsg_failure; | |
df71837d TJ |
1706 | if (copy_to_user_sec_ctx(xp, skb)) |
1707 | goto nlmsg_failure; | |
1da177e4 LT |
1708 | |
1709 | nlh->nlmsg_len = skb->tail - b; | |
1710 | return skb->len; | |
1711 | ||
1712 | nlmsg_failure: | |
1713 | skb_trim(skb, b - skb->data); | |
1714 | return -1; | |
1715 | } | |
1716 | ||
1717 | static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt, | |
1718 | struct xfrm_policy *xp, int dir) | |
1719 | { | |
1720 | struct sk_buff *skb; | |
1721 | size_t len; | |
1722 | ||
1723 | len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr); | |
1724 | len += NLMSG_SPACE(sizeof(struct xfrm_user_acquire)); | |
df71837d | 1725 | len += RTA_SPACE(xfrm_user_sec_ctx_size(xp)); |
1da177e4 LT |
1726 | skb = alloc_skb(len, GFP_ATOMIC); |
1727 | if (skb == NULL) | |
1728 | return -ENOMEM; | |
1729 | ||
1730 | if (build_acquire(skb, x, xt, xp, dir) < 0) | |
1731 | BUG(); | |
1732 | ||
ac6d439d PM |
1733 | NETLINK_CB(skb).dst_group = XFRMNLGRP_ACQUIRE; |
1734 | return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_ACQUIRE, GFP_ATOMIC); | |
1da177e4 LT |
1735 | } |
1736 | ||
1737 | /* User gives us xfrm_user_policy_info followed by an array of 0 | |
1738 | * or more templates. | |
1739 | */ | |
1740 | static struct xfrm_policy *xfrm_compile_policy(u16 family, int opt, | |
1741 | u8 *data, int len, int *dir) | |
1742 | { | |
1743 | struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data; | |
1744 | struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1); | |
1745 | struct xfrm_policy *xp; | |
1746 | int nr; | |
1747 | ||
1748 | switch (family) { | |
1749 | case AF_INET: | |
1750 | if (opt != IP_XFRM_POLICY) { | |
1751 | *dir = -EOPNOTSUPP; | |
1752 | return NULL; | |
1753 | } | |
1754 | break; | |
1755 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
1756 | case AF_INET6: | |
1757 | if (opt != IPV6_XFRM_POLICY) { | |
1758 | *dir = -EOPNOTSUPP; | |
1759 | return NULL; | |
1760 | } | |
1761 | break; | |
1762 | #endif | |
1763 | default: | |
1764 | *dir = -EINVAL; | |
1765 | return NULL; | |
1766 | } | |
1767 | ||
1768 | *dir = -EINVAL; | |
1769 | ||
1770 | if (len < sizeof(*p) || | |
1771 | verify_newpolicy_info(p)) | |
1772 | return NULL; | |
1773 | ||
1774 | nr = ((len - sizeof(*p)) / sizeof(*ut)); | |
1775 | if (nr > XFRM_MAX_DEPTH) | |
1776 | return NULL; | |
1777 | ||
a4f1bac6 HX |
1778 | if (p->dir > XFRM_POLICY_OUT) |
1779 | return NULL; | |
1780 | ||
1da177e4 LT |
1781 | xp = xfrm_policy_alloc(GFP_KERNEL); |
1782 | if (xp == NULL) { | |
1783 | *dir = -ENOBUFS; | |
1784 | return NULL; | |
1785 | } | |
1786 | ||
1787 | copy_from_user_policy(xp, p); | |
1788 | copy_templates(xp, ut, nr); | |
1789 | ||
1790 | *dir = p->dir; | |
1791 | ||
1792 | return xp; | |
1793 | } | |
1794 | ||
1795 | static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp, | |
d51d081d | 1796 | int dir, struct km_event *c) |
1da177e4 LT |
1797 | { |
1798 | struct xfrm_user_polexpire *upe; | |
1799 | struct nlmsghdr *nlh; | |
d51d081d | 1800 | int hard = c->data.hard; |
1da177e4 LT |
1801 | unsigned char *b = skb->tail; |
1802 | ||
d51d081d | 1803 | nlh = NLMSG_PUT(skb, c->pid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe)); |
1da177e4 LT |
1804 | upe = NLMSG_DATA(nlh); |
1805 | nlh->nlmsg_flags = 0; | |
1806 | ||
1807 | copy_to_user_policy(xp, &upe->pol, dir); | |
1808 | if (copy_to_user_tmpl(xp, skb) < 0) | |
1809 | goto nlmsg_failure; | |
df71837d TJ |
1810 | if (copy_to_user_sec_ctx(xp, skb)) |
1811 | goto nlmsg_failure; | |
1da177e4 LT |
1812 | upe->hard = !!hard; |
1813 | ||
1814 | nlh->nlmsg_len = skb->tail - b; | |
1815 | return skb->len; | |
1816 | ||
1817 | nlmsg_failure: | |
1818 | skb_trim(skb, b - skb->data); | |
1819 | return -1; | |
1820 | } | |
1821 | ||
26b15dad | 1822 | static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c) |
1da177e4 LT |
1823 | { |
1824 | struct sk_buff *skb; | |
1825 | size_t len; | |
1826 | ||
1827 | len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr); | |
1828 | len += NLMSG_SPACE(sizeof(struct xfrm_user_polexpire)); | |
df71837d | 1829 | len += RTA_SPACE(xfrm_user_sec_ctx_size(xp)); |
1da177e4 LT |
1830 | skb = alloc_skb(len, GFP_ATOMIC); |
1831 | if (skb == NULL) | |
1832 | return -ENOMEM; | |
1833 | ||
d51d081d | 1834 | if (build_polexpire(skb, xp, dir, c) < 0) |
1da177e4 LT |
1835 | BUG(); |
1836 | ||
ac6d439d PM |
1837 | NETLINK_CB(skb).dst_group = XFRMNLGRP_EXPIRE; |
1838 | return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC); | |
1da177e4 LT |
1839 | } |
1840 | ||
26b15dad JHS |
1841 | static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c) |
1842 | { | |
1843 | struct xfrm_userpolicy_info *p; | |
0603eac0 | 1844 | struct xfrm_userpolicy_id *id; |
26b15dad JHS |
1845 | struct nlmsghdr *nlh; |
1846 | struct sk_buff *skb; | |
26b15dad JHS |
1847 | unsigned char *b; |
1848 | int len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr); | |
0603eac0 HX |
1849 | int headlen; |
1850 | ||
1851 | headlen = sizeof(*p); | |
1852 | if (c->event == XFRM_MSG_DELPOLICY) { | |
1853 | len += RTA_SPACE(headlen); | |
1854 | headlen = sizeof(*id); | |
1855 | } | |
1856 | len += NLMSG_SPACE(headlen); | |
26b15dad JHS |
1857 | |
1858 | skb = alloc_skb(len, GFP_ATOMIC); | |
1859 | if (skb == NULL) | |
1860 | return -ENOMEM; | |
1861 | b = skb->tail; | |
1862 | ||
0603eac0 | 1863 | nlh = NLMSG_PUT(skb, c->pid, c->seq, c->event, headlen); |
26b15dad JHS |
1864 | |
1865 | p = NLMSG_DATA(nlh); | |
0603eac0 HX |
1866 | if (c->event == XFRM_MSG_DELPOLICY) { |
1867 | id = NLMSG_DATA(nlh); | |
1868 | memset(id, 0, sizeof(*id)); | |
1869 | id->dir = dir; | |
1870 | if (c->data.byid) | |
1871 | id->index = xp->index; | |
1872 | else | |
1873 | memcpy(&id->sel, &xp->selector, sizeof(id->sel)); | |
1874 | ||
1875 | p = RTA_DATA(__RTA_PUT(skb, XFRMA_POLICY, sizeof(*p))); | |
1876 | } | |
26b15dad JHS |
1877 | |
1878 | nlh->nlmsg_flags = 0; | |
1879 | ||
1880 | copy_to_user_policy(xp, p, dir); | |
1881 | if (copy_to_user_tmpl(xp, skb) < 0) | |
1882 | goto nlmsg_failure; | |
1883 | ||
1884 | nlh->nlmsg_len = skb->tail - b; | |
1885 | ||
ac6d439d PM |
1886 | NETLINK_CB(skb).dst_group = XFRMNLGRP_POLICY; |
1887 | return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC); | |
26b15dad JHS |
1888 | |
1889 | nlmsg_failure: | |
0603eac0 | 1890 | rtattr_failure: |
26b15dad JHS |
1891 | kfree_skb(skb); |
1892 | return -1; | |
1893 | } | |
1894 | ||
1895 | static int xfrm_notify_policy_flush(struct km_event *c) | |
1896 | { | |
1897 | struct nlmsghdr *nlh; | |
1898 | struct sk_buff *skb; | |
1899 | unsigned char *b; | |
1900 | int len = NLMSG_LENGTH(0); | |
1901 | ||
1902 | skb = alloc_skb(len, GFP_ATOMIC); | |
1903 | if (skb == NULL) | |
1904 | return -ENOMEM; | |
1905 | b = skb->tail; | |
1906 | ||
1907 | ||
1908 | nlh = NLMSG_PUT(skb, c->pid, c->seq, XFRM_MSG_FLUSHPOLICY, 0); | |
1909 | ||
1910 | nlh->nlmsg_len = skb->tail - b; | |
1911 | ||
ac6d439d PM |
1912 | NETLINK_CB(skb).dst_group = XFRMNLGRP_POLICY; |
1913 | return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC); | |
26b15dad JHS |
1914 | |
1915 | nlmsg_failure: | |
1916 | kfree_skb(skb); | |
1917 | return -1; | |
1918 | } | |
1919 | ||
1920 | static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c) | |
1921 | { | |
1922 | ||
1923 | switch (c->event) { | |
f60f6b8f HX |
1924 | case XFRM_MSG_NEWPOLICY: |
1925 | case XFRM_MSG_UPDPOLICY: | |
1926 | case XFRM_MSG_DELPOLICY: | |
26b15dad | 1927 | return xfrm_notify_policy(xp, dir, c); |
f60f6b8f | 1928 | case XFRM_MSG_FLUSHPOLICY: |
26b15dad | 1929 | return xfrm_notify_policy_flush(c); |
f60f6b8f | 1930 | case XFRM_MSG_POLEXPIRE: |
26b15dad JHS |
1931 | return xfrm_exp_policy_notify(xp, dir, c); |
1932 | default: | |
1933 | printk("xfrm_user: Unknown Policy event %d\n", c->event); | |
1934 | } | |
1935 | ||
1936 | return 0; | |
1937 | ||
1938 | } | |
1939 | ||
1da177e4 LT |
1940 | static struct xfrm_mgr netlink_mgr = { |
1941 | .id = "netlink", | |
1942 | .notify = xfrm_send_state_notify, | |
1943 | .acquire = xfrm_send_acquire, | |
1944 | .compile_policy = xfrm_compile_policy, | |
1945 | .notify_policy = xfrm_send_policy_notify, | |
1946 | }; | |
1947 | ||
1948 | static int __init xfrm_user_init(void) | |
1949 | { | |
1950 | printk(KERN_INFO "Initializing IPsec netlink socket\n"); | |
1951 | ||
06628607 PM |
1952 | xfrm_nl = netlink_kernel_create(NETLINK_XFRM, XFRMNLGRP_MAX, |
1953 | xfrm_netlink_rcv, THIS_MODULE); | |
1da177e4 LT |
1954 | if (xfrm_nl == NULL) |
1955 | return -ENOMEM; | |
1956 | ||
1957 | xfrm_register_km(&netlink_mgr); | |
1958 | ||
1959 | return 0; | |
1960 | } | |
1961 | ||
1962 | static void __exit xfrm_user_exit(void) | |
1963 | { | |
1964 | xfrm_unregister_km(&netlink_mgr); | |
1965 | sock_release(xfrm_nl->sk_socket); | |
1966 | } | |
1967 | ||
1968 | module_init(xfrm_user_init); | |
1969 | module_exit(xfrm_user_exit); | |
1970 | MODULE_LICENSE("GPL"); | |
4fdb3bb7 | 1971 | MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM); |
f8cd5488 | 1972 |