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