Root/
1 | /* xfrm_user.c: User interface to configure xfrm engine. |
2 | * |
3 | * Copyright (C) 2002 David S. Miller (davem@redhat.com) |
4 | * |
5 | * Changes: |
6 | * Mitsuru KANDA @USAGI |
7 | * Kazunori MIYAZAWA @USAGI |
8 | * Kunihiro Ishiguro <kunihiro@ipinfusion.com> |
9 | * IPv6 support |
10 | * |
11 | */ |
12 | |
13 | #include <linux/crypto.h> |
14 | #include <linux/module.h> |
15 | #include <linux/kernel.h> |
16 | #include <linux/types.h> |
17 | #include <linux/slab.h> |
18 | #include <linux/socket.h> |
19 | #include <linux/string.h> |
20 | #include <linux/net.h> |
21 | #include <linux/skbuff.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> |
28 | #include <net/netlink.h> |
29 | #include <asm/uaccess.h> |
30 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
31 | #include <linux/in6.h> |
32 | #endif |
33 | |
34 | static inline int aead_len(struct xfrm_algo_aead *alg) |
35 | { |
36 | return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); |
37 | } |
38 | |
39 | static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type) |
40 | { |
41 | struct nlattr *rt = attrs[type]; |
42 | struct xfrm_algo *algp; |
43 | |
44 | if (!rt) |
45 | return 0; |
46 | |
47 | algp = nla_data(rt); |
48 | if (nla_len(rt) < xfrm_alg_len(algp)) |
49 | return -EINVAL; |
50 | |
51 | switch (type) { |
52 | case XFRMA_ALG_AUTH: |
53 | case XFRMA_ALG_CRYPT: |
54 | case XFRMA_ALG_COMP: |
55 | break; |
56 | |
57 | default: |
58 | return -EINVAL; |
59 | } |
60 | |
61 | algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0'; |
62 | return 0; |
63 | } |
64 | |
65 | static int verify_aead(struct nlattr **attrs) |
66 | { |
67 | struct nlattr *rt = attrs[XFRMA_ALG_AEAD]; |
68 | struct xfrm_algo_aead *algp; |
69 | |
70 | if (!rt) |
71 | return 0; |
72 | |
73 | algp = nla_data(rt); |
74 | if (nla_len(rt) < aead_len(algp)) |
75 | return -EINVAL; |
76 | |
77 | algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0'; |
78 | return 0; |
79 | } |
80 | |
81 | static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type, |
82 | xfrm_address_t **addrp) |
83 | { |
84 | struct nlattr *rt = attrs[type]; |
85 | |
86 | if (rt && addrp) |
87 | *addrp = nla_data(rt); |
88 | } |
89 | |
90 | static inline int verify_sec_ctx_len(struct nlattr **attrs) |
91 | { |
92 | struct nlattr *rt = attrs[XFRMA_SEC_CTX]; |
93 | struct xfrm_user_sec_ctx *uctx; |
94 | |
95 | if (!rt) |
96 | return 0; |
97 | |
98 | uctx = nla_data(rt); |
99 | if (uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len)) |
100 | return -EINVAL; |
101 | |
102 | return 0; |
103 | } |
104 | |
105 | |
106 | static int verify_newsa_info(struct xfrm_usersa_info *p, |
107 | struct nlattr **attrs) |
108 | { |
109 | int err; |
110 | |
111 | err = -EINVAL; |
112 | switch (p->family) { |
113 | case AF_INET: |
114 | break; |
115 | |
116 | case AF_INET6: |
117 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
118 | break; |
119 | #else |
120 | err = -EAFNOSUPPORT; |
121 | goto out; |
122 | #endif |
123 | |
124 | default: |
125 | goto out; |
126 | } |
127 | |
128 | err = -EINVAL; |
129 | switch (p->id.proto) { |
130 | case IPPROTO_AH: |
131 | if (!attrs[XFRMA_ALG_AUTH] || |
132 | attrs[XFRMA_ALG_AEAD] || |
133 | attrs[XFRMA_ALG_CRYPT] || |
134 | attrs[XFRMA_ALG_COMP]) |
135 | goto out; |
136 | break; |
137 | |
138 | case IPPROTO_ESP: |
139 | if (attrs[XFRMA_ALG_COMP]) |
140 | goto out; |
141 | if (!attrs[XFRMA_ALG_AUTH] && |
142 | !attrs[XFRMA_ALG_CRYPT] && |
143 | !attrs[XFRMA_ALG_AEAD]) |
144 | goto out; |
145 | if ((attrs[XFRMA_ALG_AUTH] || |
146 | attrs[XFRMA_ALG_CRYPT]) && |
147 | attrs[XFRMA_ALG_AEAD]) |
148 | goto out; |
149 | break; |
150 | |
151 | case IPPROTO_COMP: |
152 | if (!attrs[XFRMA_ALG_COMP] || |
153 | attrs[XFRMA_ALG_AEAD] || |
154 | attrs[XFRMA_ALG_AUTH] || |
155 | attrs[XFRMA_ALG_CRYPT]) |
156 | goto out; |
157 | break; |
158 | |
159 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
160 | case IPPROTO_DSTOPTS: |
161 | case IPPROTO_ROUTING: |
162 | if (attrs[XFRMA_ALG_COMP] || |
163 | attrs[XFRMA_ALG_AUTH] || |
164 | attrs[XFRMA_ALG_AEAD] || |
165 | attrs[XFRMA_ALG_CRYPT] || |
166 | attrs[XFRMA_ENCAP] || |
167 | attrs[XFRMA_SEC_CTX] || |
168 | !attrs[XFRMA_COADDR]) |
169 | goto out; |
170 | break; |
171 | #endif |
172 | |
173 | default: |
174 | goto out; |
175 | } |
176 | |
177 | if ((err = verify_aead(attrs))) |
178 | goto out; |
179 | if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH))) |
180 | goto out; |
181 | if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT))) |
182 | goto out; |
183 | if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP))) |
184 | goto out; |
185 | if ((err = verify_sec_ctx_len(attrs))) |
186 | goto out; |
187 | |
188 | err = -EINVAL; |
189 | switch (p->mode) { |
190 | case XFRM_MODE_TRANSPORT: |
191 | case XFRM_MODE_TUNNEL: |
192 | case XFRM_MODE_ROUTEOPTIMIZATION: |
193 | case XFRM_MODE_BEET: |
194 | break; |
195 | |
196 | default: |
197 | goto out; |
198 | } |
199 | |
200 | err = 0; |
201 | |
202 | out: |
203 | return err; |
204 | } |
205 | |
206 | static int attach_one_algo(struct xfrm_algo **algpp, u8 *props, |
207 | struct xfrm_algo_desc *(*get_byname)(char *, int), |
208 | struct nlattr *rta) |
209 | { |
210 | struct xfrm_algo *p, *ualg; |
211 | struct xfrm_algo_desc *algo; |
212 | |
213 | if (!rta) |
214 | return 0; |
215 | |
216 | ualg = nla_data(rta); |
217 | |
218 | algo = get_byname(ualg->alg_name, 1); |
219 | if (!algo) |
220 | return -ENOSYS; |
221 | *props = algo->desc.sadb_alg_id; |
222 | |
223 | p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL); |
224 | if (!p) |
225 | return -ENOMEM; |
226 | |
227 | strcpy(p->alg_name, algo->name); |
228 | *algpp = p; |
229 | return 0; |
230 | } |
231 | |
232 | static int attach_aead(struct xfrm_algo_aead **algpp, u8 *props, |
233 | struct nlattr *rta) |
234 | { |
235 | struct xfrm_algo_aead *p, *ualg; |
236 | struct xfrm_algo_desc *algo; |
237 | |
238 | if (!rta) |
239 | return 0; |
240 | |
241 | ualg = nla_data(rta); |
242 | |
243 | algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1); |
244 | if (!algo) |
245 | return -ENOSYS; |
246 | *props = algo->desc.sadb_alg_id; |
247 | |
248 | p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL); |
249 | if (!p) |
250 | return -ENOMEM; |
251 | |
252 | strcpy(p->alg_name, algo->name); |
253 | *algpp = p; |
254 | return 0; |
255 | } |
256 | |
257 | static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx) |
258 | { |
259 | int len = 0; |
260 | |
261 | if (xfrm_ctx) { |
262 | len += sizeof(struct xfrm_user_sec_ctx); |
263 | len += xfrm_ctx->ctx_len; |
264 | } |
265 | return len; |
266 | } |
267 | |
268 | static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p) |
269 | { |
270 | memcpy(&x->id, &p->id, sizeof(x->id)); |
271 | memcpy(&x->sel, &p->sel, sizeof(x->sel)); |
272 | memcpy(&x->lft, &p->lft, sizeof(x->lft)); |
273 | x->props.mode = p->mode; |
274 | x->props.replay_window = p->replay_window; |
275 | x->props.reqid = p->reqid; |
276 | x->props.family = p->family; |
277 | memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr)); |
278 | x->props.flags = p->flags; |
279 | |
280 | if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC)) |
281 | x->sel.family = p->family; |
282 | } |
283 | |
284 | /* |
285 | * someday when pfkey also has support, we could have the code |
286 | * somehow made shareable and move it to xfrm_state.c - JHS |
287 | * |
288 | */ |
289 | static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs) |
290 | { |
291 | struct nlattr *rp = attrs[XFRMA_REPLAY_VAL]; |
292 | struct nlattr *lt = attrs[XFRMA_LTIME_VAL]; |
293 | struct nlattr *et = attrs[XFRMA_ETIMER_THRESH]; |
294 | struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH]; |
295 | |
296 | if (rp) { |
297 | struct xfrm_replay_state *replay; |
298 | replay = nla_data(rp); |
299 | memcpy(&x->replay, replay, sizeof(*replay)); |
300 | memcpy(&x->preplay, replay, sizeof(*replay)); |
301 | } |
302 | |
303 | if (lt) { |
304 | struct xfrm_lifetime_cur *ltime; |
305 | ltime = nla_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 | x->replay_maxage = nla_get_u32(et); |
314 | |
315 | if (rt) |
316 | x->replay_maxdiff = nla_get_u32(rt); |
317 | } |
318 | |
319 | static struct xfrm_state *xfrm_state_construct(struct net *net, |
320 | struct xfrm_usersa_info *p, |
321 | struct nlattr **attrs, |
322 | int *errp) |
323 | { |
324 | struct xfrm_state *x = xfrm_state_alloc(net); |
325 | int err = -ENOMEM; |
326 | |
327 | if (!x) |
328 | goto error_no_put; |
329 | |
330 | copy_from_user_state(x, p); |
331 | |
332 | if ((err = attach_aead(&x->aead, &x->props.ealgo, |
333 | attrs[XFRMA_ALG_AEAD]))) |
334 | goto error; |
335 | if ((err = attach_one_algo(&x->aalg, &x->props.aalgo, |
336 | xfrm_aalg_get_byname, |
337 | attrs[XFRMA_ALG_AUTH]))) |
338 | goto error; |
339 | if ((err = attach_one_algo(&x->ealg, &x->props.ealgo, |
340 | xfrm_ealg_get_byname, |
341 | attrs[XFRMA_ALG_CRYPT]))) |
342 | goto error; |
343 | if ((err = attach_one_algo(&x->calg, &x->props.calgo, |
344 | xfrm_calg_get_byname, |
345 | attrs[XFRMA_ALG_COMP]))) |
346 | goto error; |
347 | |
348 | if (attrs[XFRMA_ENCAP]) { |
349 | x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]), |
350 | sizeof(*x->encap), GFP_KERNEL); |
351 | if (x->encap == NULL) |
352 | goto error; |
353 | } |
354 | |
355 | if (attrs[XFRMA_COADDR]) { |
356 | x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]), |
357 | sizeof(*x->coaddr), GFP_KERNEL); |
358 | if (x->coaddr == NULL) |
359 | goto error; |
360 | } |
361 | |
362 | err = xfrm_init_state(x); |
363 | if (err) |
364 | goto error; |
365 | |
366 | if (attrs[XFRMA_SEC_CTX] && |
367 | security_xfrm_state_alloc(x, nla_data(attrs[XFRMA_SEC_CTX]))) |
368 | goto error; |
369 | |
370 | x->km.seq = p->seq; |
371 | x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth; |
372 | /* sysctl_xfrm_aevent_etime is in 100ms units */ |
373 | x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M; |
374 | x->preplay.bitmap = 0; |
375 | x->preplay.seq = x->replay.seq+x->replay_maxdiff; |
376 | x->preplay.oseq = x->replay.oseq +x->replay_maxdiff; |
377 | |
378 | /* override default values from above */ |
379 | |
380 | xfrm_update_ae_params(x, attrs); |
381 | |
382 | return x; |
383 | |
384 | error: |
385 | x->km.state = XFRM_STATE_DEAD; |
386 | xfrm_state_put(x); |
387 | error_no_put: |
388 | *errp = err; |
389 | return NULL; |
390 | } |
391 | |
392 | static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh, |
393 | struct nlattr **attrs) |
394 | { |
395 | struct net *net = sock_net(skb->sk); |
396 | struct xfrm_usersa_info *p = nlmsg_data(nlh); |
397 | struct xfrm_state *x; |
398 | int err; |
399 | struct km_event c; |
400 | uid_t loginuid = NETLINK_CB(skb).loginuid; |
401 | u32 sessionid = NETLINK_CB(skb).sessionid; |
402 | u32 sid = NETLINK_CB(skb).sid; |
403 | |
404 | err = verify_newsa_info(p, attrs); |
405 | if (err) |
406 | return err; |
407 | |
408 | x = xfrm_state_construct(net, p, attrs, &err); |
409 | if (!x) |
410 | return err; |
411 | |
412 | xfrm_state_hold(x); |
413 | if (nlh->nlmsg_type == XFRM_MSG_NEWSA) |
414 | err = xfrm_state_add(x); |
415 | else |
416 | err = xfrm_state_update(x); |
417 | |
418 | xfrm_audit_state_add(x, err ? 0 : 1, loginuid, sessionid, sid); |
419 | |
420 | if (err < 0) { |
421 | x->km.state = XFRM_STATE_DEAD; |
422 | __xfrm_state_put(x); |
423 | goto out; |
424 | } |
425 | |
426 | c.seq = nlh->nlmsg_seq; |
427 | c.pid = nlh->nlmsg_pid; |
428 | c.event = nlh->nlmsg_type; |
429 | |
430 | km_state_notify(x, &c); |
431 | out: |
432 | xfrm_state_put(x); |
433 | return err; |
434 | } |
435 | |
436 | static struct xfrm_state *xfrm_user_state_lookup(struct net *net, |
437 | struct xfrm_usersa_id *p, |
438 | struct nlattr **attrs, |
439 | int *errp) |
440 | { |
441 | struct xfrm_state *x = NULL; |
442 | int err; |
443 | |
444 | if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) { |
445 | err = -ESRCH; |
446 | x = xfrm_state_lookup(net, &p->daddr, p->spi, p->proto, p->family); |
447 | } else { |
448 | xfrm_address_t *saddr = NULL; |
449 | |
450 | verify_one_addr(attrs, XFRMA_SRCADDR, &saddr); |
451 | if (!saddr) { |
452 | err = -EINVAL; |
453 | goto out; |
454 | } |
455 | |
456 | err = -ESRCH; |
457 | x = xfrm_state_lookup_byaddr(net, &p->daddr, saddr, |
458 | p->proto, p->family); |
459 | } |
460 | |
461 | out: |
462 | if (!x && errp) |
463 | *errp = err; |
464 | return x; |
465 | } |
466 | |
467 | static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh, |
468 | struct nlattr **attrs) |
469 | { |
470 | struct net *net = sock_net(skb->sk); |
471 | struct xfrm_state *x; |
472 | int err = -ESRCH; |
473 | struct km_event c; |
474 | struct xfrm_usersa_id *p = nlmsg_data(nlh); |
475 | uid_t loginuid = NETLINK_CB(skb).loginuid; |
476 | u32 sessionid = NETLINK_CB(skb).sessionid; |
477 | u32 sid = NETLINK_CB(skb).sid; |
478 | |
479 | x = xfrm_user_state_lookup(net, p, attrs, &err); |
480 | if (x == NULL) |
481 | return err; |
482 | |
483 | if ((err = security_xfrm_state_delete(x)) != 0) |
484 | goto out; |
485 | |
486 | if (xfrm_state_kern(x)) { |
487 | err = -EPERM; |
488 | goto out; |
489 | } |
490 | |
491 | err = xfrm_state_delete(x); |
492 | |
493 | if (err < 0) |
494 | goto out; |
495 | |
496 | c.seq = nlh->nlmsg_seq; |
497 | c.pid = nlh->nlmsg_pid; |
498 | c.event = nlh->nlmsg_type; |
499 | km_state_notify(x, &c); |
500 | |
501 | out: |
502 | xfrm_audit_state_delete(x, err ? 0 : 1, loginuid, sessionid, sid); |
503 | xfrm_state_put(x); |
504 | return err; |
505 | } |
506 | |
507 | static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p) |
508 | { |
509 | memcpy(&p->id, &x->id, sizeof(p->id)); |
510 | memcpy(&p->sel, &x->sel, sizeof(p->sel)); |
511 | memcpy(&p->lft, &x->lft, sizeof(p->lft)); |
512 | memcpy(&p->curlft, &x->curlft, sizeof(p->curlft)); |
513 | memcpy(&p->stats, &x->stats, sizeof(p->stats)); |
514 | memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr)); |
515 | p->mode = x->props.mode; |
516 | p->replay_window = x->props.replay_window; |
517 | p->reqid = x->props.reqid; |
518 | p->family = x->props.family; |
519 | p->flags = x->props.flags; |
520 | p->seq = x->km.seq; |
521 | } |
522 | |
523 | struct xfrm_dump_info { |
524 | struct sk_buff *in_skb; |
525 | struct sk_buff *out_skb; |
526 | u32 nlmsg_seq; |
527 | u16 nlmsg_flags; |
528 | }; |
529 | |
530 | static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb) |
531 | { |
532 | struct xfrm_user_sec_ctx *uctx; |
533 | struct nlattr *attr; |
534 | int ctx_size = sizeof(*uctx) + s->ctx_len; |
535 | |
536 | attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size); |
537 | if (attr == NULL) |
538 | return -EMSGSIZE; |
539 | |
540 | uctx = nla_data(attr); |
541 | uctx->exttype = XFRMA_SEC_CTX; |
542 | uctx->len = ctx_size; |
543 | uctx->ctx_doi = s->ctx_doi; |
544 | uctx->ctx_alg = s->ctx_alg; |
545 | uctx->ctx_len = s->ctx_len; |
546 | memcpy(uctx + 1, s->ctx_str, s->ctx_len); |
547 | |
548 | return 0; |
549 | } |
550 | |
551 | /* Don't change this without updating xfrm_sa_len! */ |
552 | static int copy_to_user_state_extra(struct xfrm_state *x, |
553 | struct xfrm_usersa_info *p, |
554 | struct sk_buff *skb) |
555 | { |
556 | copy_to_user_state(x, p); |
557 | |
558 | if (x->coaddr) |
559 | NLA_PUT(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr); |
560 | |
561 | if (x->lastused) |
562 | NLA_PUT_U64(skb, XFRMA_LASTUSED, x->lastused); |
563 | |
564 | if (x->aead) |
565 | NLA_PUT(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead); |
566 | if (x->aalg) |
567 | NLA_PUT(skb, XFRMA_ALG_AUTH, xfrm_alg_len(x->aalg), x->aalg); |
568 | if (x->ealg) |
569 | NLA_PUT(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg); |
570 | if (x->calg) |
571 | NLA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg); |
572 | |
573 | if (x->encap) |
574 | NLA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap); |
575 | |
576 | if (x->security && copy_sec_ctx(x->security, skb) < 0) |
577 | goto nla_put_failure; |
578 | |
579 | return 0; |
580 | |
581 | nla_put_failure: |
582 | return -EMSGSIZE; |
583 | } |
584 | |
585 | static int dump_one_state(struct xfrm_state *x, int count, void *ptr) |
586 | { |
587 | struct xfrm_dump_info *sp = ptr; |
588 | struct sk_buff *in_skb = sp->in_skb; |
589 | struct sk_buff *skb = sp->out_skb; |
590 | struct xfrm_usersa_info *p; |
591 | struct nlmsghdr *nlh; |
592 | int err; |
593 | |
594 | nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq, |
595 | XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags); |
596 | if (nlh == NULL) |
597 | return -EMSGSIZE; |
598 | |
599 | p = nlmsg_data(nlh); |
600 | |
601 | err = copy_to_user_state_extra(x, p, skb); |
602 | if (err) |
603 | goto nla_put_failure; |
604 | |
605 | nlmsg_end(skb, nlh); |
606 | return 0; |
607 | |
608 | nla_put_failure: |
609 | nlmsg_cancel(skb, nlh); |
610 | return err; |
611 | } |
612 | |
613 | static int xfrm_dump_sa_done(struct netlink_callback *cb) |
614 | { |
615 | struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1]; |
616 | xfrm_state_walk_done(walk); |
617 | return 0; |
618 | } |
619 | |
620 | static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb) |
621 | { |
622 | struct net *net = sock_net(skb->sk); |
623 | struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1]; |
624 | struct xfrm_dump_info info; |
625 | |
626 | BUILD_BUG_ON(sizeof(struct xfrm_state_walk) > |
627 | sizeof(cb->args) - sizeof(cb->args[0])); |
628 | |
629 | info.in_skb = cb->skb; |
630 | info.out_skb = skb; |
631 | info.nlmsg_seq = cb->nlh->nlmsg_seq; |
632 | info.nlmsg_flags = NLM_F_MULTI; |
633 | |
634 | if (!cb->args[0]) { |
635 | cb->args[0] = 1; |
636 | xfrm_state_walk_init(walk, 0); |
637 | } |
638 | |
639 | (void) xfrm_state_walk(net, walk, dump_one_state, &info); |
640 | |
641 | return skb->len; |
642 | } |
643 | |
644 | static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb, |
645 | struct xfrm_state *x, u32 seq) |
646 | { |
647 | struct xfrm_dump_info info; |
648 | struct sk_buff *skb; |
649 | |
650 | skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); |
651 | if (!skb) |
652 | return ERR_PTR(-ENOMEM); |
653 | |
654 | info.in_skb = in_skb; |
655 | info.out_skb = skb; |
656 | info.nlmsg_seq = seq; |
657 | info.nlmsg_flags = 0; |
658 | |
659 | if (dump_one_state(x, 0, &info)) { |
660 | kfree_skb(skb); |
661 | return NULL; |
662 | } |
663 | |
664 | return skb; |
665 | } |
666 | |
667 | static inline size_t xfrm_spdinfo_msgsize(void) |
668 | { |
669 | return NLMSG_ALIGN(4) |
670 | + nla_total_size(sizeof(struct xfrmu_spdinfo)) |
671 | + nla_total_size(sizeof(struct xfrmu_spdhinfo)); |
672 | } |
673 | |
674 | static int build_spdinfo(struct sk_buff *skb, u32 pid, u32 seq, u32 flags) |
675 | { |
676 | struct xfrmk_spdinfo si; |
677 | struct xfrmu_spdinfo spc; |
678 | struct xfrmu_spdhinfo sph; |
679 | struct nlmsghdr *nlh; |
680 | u32 *f; |
681 | |
682 | nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0); |
683 | if (nlh == NULL) /* shouldnt really happen ... */ |
684 | return -EMSGSIZE; |
685 | |
686 | f = nlmsg_data(nlh); |
687 | *f = flags; |
688 | xfrm_spd_getinfo(&si); |
689 | spc.incnt = si.incnt; |
690 | spc.outcnt = si.outcnt; |
691 | spc.fwdcnt = si.fwdcnt; |
692 | spc.inscnt = si.inscnt; |
693 | spc.outscnt = si.outscnt; |
694 | spc.fwdscnt = si.fwdscnt; |
695 | sph.spdhcnt = si.spdhcnt; |
696 | sph.spdhmcnt = si.spdhmcnt; |
697 | |
698 | NLA_PUT(skb, XFRMA_SPD_INFO, sizeof(spc), &spc); |
699 | NLA_PUT(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph); |
700 | |
701 | return nlmsg_end(skb, nlh); |
702 | |
703 | nla_put_failure: |
704 | nlmsg_cancel(skb, nlh); |
705 | return -EMSGSIZE; |
706 | } |
707 | |
708 | static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh, |
709 | struct nlattr **attrs) |
710 | { |
711 | struct net *net = sock_net(skb->sk); |
712 | struct sk_buff *r_skb; |
713 | u32 *flags = nlmsg_data(nlh); |
714 | u32 spid = NETLINK_CB(skb).pid; |
715 | u32 seq = nlh->nlmsg_seq; |
716 | |
717 | r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC); |
718 | if (r_skb == NULL) |
719 | return -ENOMEM; |
720 | |
721 | if (build_spdinfo(r_skb, spid, seq, *flags) < 0) |
722 | BUG(); |
723 | |
724 | return nlmsg_unicast(net->xfrm.nlsk, r_skb, spid); |
725 | } |
726 | |
727 | static inline size_t xfrm_sadinfo_msgsize(void) |
728 | { |
729 | return NLMSG_ALIGN(4) |
730 | + nla_total_size(sizeof(struct xfrmu_sadhinfo)) |
731 | + nla_total_size(4); /* XFRMA_SAD_CNT */ |
732 | } |
733 | |
734 | static int build_sadinfo(struct sk_buff *skb, u32 pid, u32 seq, u32 flags) |
735 | { |
736 | struct xfrmk_sadinfo si; |
737 | struct xfrmu_sadhinfo sh; |
738 | struct nlmsghdr *nlh; |
739 | u32 *f; |
740 | |
741 | nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0); |
742 | if (nlh == NULL) /* shouldnt really happen ... */ |
743 | return -EMSGSIZE; |
744 | |
745 | f = nlmsg_data(nlh); |
746 | *f = flags; |
747 | xfrm_sad_getinfo(&si); |
748 | |
749 | sh.sadhmcnt = si.sadhmcnt; |
750 | sh.sadhcnt = si.sadhcnt; |
751 | |
752 | NLA_PUT_U32(skb, XFRMA_SAD_CNT, si.sadcnt); |
753 | NLA_PUT(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh); |
754 | |
755 | return nlmsg_end(skb, nlh); |
756 | |
757 | nla_put_failure: |
758 | nlmsg_cancel(skb, nlh); |
759 | return -EMSGSIZE; |
760 | } |
761 | |
762 | static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh, |
763 | struct nlattr **attrs) |
764 | { |
765 | struct net *net = sock_net(skb->sk); |
766 | struct sk_buff *r_skb; |
767 | u32 *flags = nlmsg_data(nlh); |
768 | u32 spid = NETLINK_CB(skb).pid; |
769 | u32 seq = nlh->nlmsg_seq; |
770 | |
771 | r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC); |
772 | if (r_skb == NULL) |
773 | return -ENOMEM; |
774 | |
775 | if (build_sadinfo(r_skb, spid, seq, *flags) < 0) |
776 | BUG(); |
777 | |
778 | return nlmsg_unicast(net->xfrm.nlsk, r_skb, spid); |
779 | } |
780 | |
781 | static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh, |
782 | struct nlattr **attrs) |
783 | { |
784 | struct net *net = sock_net(skb->sk); |
785 | struct xfrm_usersa_id *p = nlmsg_data(nlh); |
786 | struct xfrm_state *x; |
787 | struct sk_buff *resp_skb; |
788 | int err = -ESRCH; |
789 | |
790 | x = xfrm_user_state_lookup(net, p, attrs, &err); |
791 | if (x == NULL) |
792 | goto out_noput; |
793 | |
794 | resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); |
795 | if (IS_ERR(resp_skb)) { |
796 | err = PTR_ERR(resp_skb); |
797 | } else { |
798 | err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).pid); |
799 | } |
800 | xfrm_state_put(x); |
801 | out_noput: |
802 | return err; |
803 | } |
804 | |
805 | static int verify_userspi_info(struct xfrm_userspi_info *p) |
806 | { |
807 | switch (p->info.id.proto) { |
808 | case IPPROTO_AH: |
809 | case IPPROTO_ESP: |
810 | break; |
811 | |
812 | case IPPROTO_COMP: |
813 | /* IPCOMP spi is 16-bits. */ |
814 | if (p->max >= 0x10000) |
815 | return -EINVAL; |
816 | break; |
817 | |
818 | default: |
819 | return -EINVAL; |
820 | } |
821 | |
822 | if (p->min > p->max) |
823 | return -EINVAL; |
824 | |
825 | return 0; |
826 | } |
827 | |
828 | static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh, |
829 | struct nlattr **attrs) |
830 | { |
831 | struct net *net = sock_net(skb->sk); |
832 | struct xfrm_state *x; |
833 | struct xfrm_userspi_info *p; |
834 | struct sk_buff *resp_skb; |
835 | xfrm_address_t *daddr; |
836 | int family; |
837 | int err; |
838 | |
839 | p = nlmsg_data(nlh); |
840 | err = verify_userspi_info(p); |
841 | if (err) |
842 | goto out_noput; |
843 | |
844 | family = p->info.family; |
845 | daddr = &p->info.id.daddr; |
846 | |
847 | x = NULL; |
848 | if (p->info.seq) { |
849 | x = xfrm_find_acq_byseq(net, p->info.seq); |
850 | if (x && xfrm_addr_cmp(&x->id.daddr, daddr, family)) { |
851 | xfrm_state_put(x); |
852 | x = NULL; |
853 | } |
854 | } |
855 | |
856 | if (!x) |
857 | x = xfrm_find_acq(net, p->info.mode, p->info.reqid, |
858 | p->info.id.proto, daddr, |
859 | &p->info.saddr, 1, |
860 | family); |
861 | err = -ENOENT; |
862 | if (x == NULL) |
863 | goto out_noput; |
864 | |
865 | err = xfrm_alloc_spi(x, p->min, p->max); |
866 | if (err) |
867 | goto out; |
868 | |
869 | resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); |
870 | if (IS_ERR(resp_skb)) { |
871 | err = PTR_ERR(resp_skb); |
872 | goto out; |
873 | } |
874 | |
875 | err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).pid); |
876 | |
877 | out: |
878 | xfrm_state_put(x); |
879 | out_noput: |
880 | return err; |
881 | } |
882 | |
883 | static int verify_policy_dir(u8 dir) |
884 | { |
885 | switch (dir) { |
886 | case XFRM_POLICY_IN: |
887 | case XFRM_POLICY_OUT: |
888 | case XFRM_POLICY_FWD: |
889 | break; |
890 | |
891 | default: |
892 | return -EINVAL; |
893 | } |
894 | |
895 | return 0; |
896 | } |
897 | |
898 | static int verify_policy_type(u8 type) |
899 | { |
900 | switch (type) { |
901 | case XFRM_POLICY_TYPE_MAIN: |
902 | #ifdef CONFIG_XFRM_SUB_POLICY |
903 | case XFRM_POLICY_TYPE_SUB: |
904 | #endif |
905 | break; |
906 | |
907 | default: |
908 | return -EINVAL; |
909 | } |
910 | |
911 | return 0; |
912 | } |
913 | |
914 | static int verify_newpolicy_info(struct xfrm_userpolicy_info *p) |
915 | { |
916 | switch (p->share) { |
917 | case XFRM_SHARE_ANY: |
918 | case XFRM_SHARE_SESSION: |
919 | case XFRM_SHARE_USER: |
920 | case XFRM_SHARE_UNIQUE: |
921 | break; |
922 | |
923 | default: |
924 | return -EINVAL; |
925 | } |
926 | |
927 | switch (p->action) { |
928 | case XFRM_POLICY_ALLOW: |
929 | case XFRM_POLICY_BLOCK: |
930 | break; |
931 | |
932 | default: |
933 | return -EINVAL; |
934 | } |
935 | |
936 | switch (p->sel.family) { |
937 | case AF_INET: |
938 | break; |
939 | |
940 | case AF_INET6: |
941 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
942 | break; |
943 | #else |
944 | return -EAFNOSUPPORT; |
945 | #endif |
946 | |
947 | default: |
948 | return -EINVAL; |
949 | } |
950 | |
951 | return verify_policy_dir(p->dir); |
952 | } |
953 | |
954 | static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs) |
955 | { |
956 | struct nlattr *rt = attrs[XFRMA_SEC_CTX]; |
957 | struct xfrm_user_sec_ctx *uctx; |
958 | |
959 | if (!rt) |
960 | return 0; |
961 | |
962 | uctx = nla_data(rt); |
963 | return security_xfrm_policy_alloc(&pol->security, uctx); |
964 | } |
965 | |
966 | static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut, |
967 | int nr) |
968 | { |
969 | int i; |
970 | |
971 | xp->xfrm_nr = nr; |
972 | for (i = 0; i < nr; i++, ut++) { |
973 | struct xfrm_tmpl *t = &xp->xfrm_vec[i]; |
974 | |
975 | memcpy(&t->id, &ut->id, sizeof(struct xfrm_id)); |
976 | memcpy(&t->saddr, &ut->saddr, |
977 | sizeof(xfrm_address_t)); |
978 | t->reqid = ut->reqid; |
979 | t->mode = ut->mode; |
980 | t->share = ut->share; |
981 | t->optional = ut->optional; |
982 | t->aalgos = ut->aalgos; |
983 | t->ealgos = ut->ealgos; |
984 | t->calgos = ut->calgos; |
985 | /* If all masks are ~0, then we allow all algorithms. */ |
986 | t->allalgs = !~(t->aalgos & t->ealgos & t->calgos); |
987 | t->encap_family = ut->family; |
988 | } |
989 | } |
990 | |
991 | static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family) |
992 | { |
993 | int i; |
994 | |
995 | if (nr > XFRM_MAX_DEPTH) |
996 | return -EINVAL; |
997 | |
998 | for (i = 0; i < nr; i++) { |
999 | /* We never validated the ut->family value, so many |
1000 | * applications simply leave it at zero. The check was |
1001 | * never made and ut->family was ignored because all |
1002 | * templates could be assumed to have the same family as |
1003 | * the policy itself. Now that we will have ipv4-in-ipv6 |
1004 | * and ipv6-in-ipv4 tunnels, this is no longer true. |
1005 | */ |
1006 | if (!ut[i].family) |
1007 | ut[i].family = family; |
1008 | |
1009 | switch (ut[i].family) { |
1010 | case AF_INET: |
1011 | break; |
1012 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
1013 | case AF_INET6: |
1014 | break; |
1015 | #endif |
1016 | default: |
1017 | return -EINVAL; |
1018 | } |
1019 | } |
1020 | |
1021 | return 0; |
1022 | } |
1023 | |
1024 | static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs) |
1025 | { |
1026 | struct nlattr *rt = attrs[XFRMA_TMPL]; |
1027 | |
1028 | if (!rt) { |
1029 | pol->xfrm_nr = 0; |
1030 | } else { |
1031 | struct xfrm_user_tmpl *utmpl = nla_data(rt); |
1032 | int nr = nla_len(rt) / sizeof(*utmpl); |
1033 | int err; |
1034 | |
1035 | err = validate_tmpl(nr, utmpl, pol->family); |
1036 | if (err) |
1037 | return err; |
1038 | |
1039 | copy_templates(pol, utmpl, nr); |
1040 | } |
1041 | return 0; |
1042 | } |
1043 | |
1044 | static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs) |
1045 | { |
1046 | struct nlattr *rt = attrs[XFRMA_POLICY_TYPE]; |
1047 | struct xfrm_userpolicy_type *upt; |
1048 | u8 type = XFRM_POLICY_TYPE_MAIN; |
1049 | int err; |
1050 | |
1051 | if (rt) { |
1052 | upt = nla_data(rt); |
1053 | type = upt->type; |
1054 | } |
1055 | |
1056 | err = verify_policy_type(type); |
1057 | if (err) |
1058 | return err; |
1059 | |
1060 | *tp = type; |
1061 | return 0; |
1062 | } |
1063 | |
1064 | static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p) |
1065 | { |
1066 | xp->priority = p->priority; |
1067 | xp->index = p->index; |
1068 | memcpy(&xp->selector, &p->sel, sizeof(xp->selector)); |
1069 | memcpy(&xp->lft, &p->lft, sizeof(xp->lft)); |
1070 | xp->action = p->action; |
1071 | xp->flags = p->flags; |
1072 | xp->family = p->sel.family; |
1073 | /* XXX xp->share = p->share; */ |
1074 | } |
1075 | |
1076 | static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir) |
1077 | { |
1078 | memcpy(&p->sel, &xp->selector, sizeof(p->sel)); |
1079 | memcpy(&p->lft, &xp->lft, sizeof(p->lft)); |
1080 | memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft)); |
1081 | p->priority = xp->priority; |
1082 | p->index = xp->index; |
1083 | p->sel.family = xp->family; |
1084 | p->dir = dir; |
1085 | p->action = xp->action; |
1086 | p->flags = xp->flags; |
1087 | p->share = XFRM_SHARE_ANY; /* XXX xp->share */ |
1088 | } |
1089 | |
1090 | static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp) |
1091 | { |
1092 | struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL); |
1093 | int err; |
1094 | |
1095 | if (!xp) { |
1096 | *errp = -ENOMEM; |
1097 | return NULL; |
1098 | } |
1099 | |
1100 | copy_from_user_policy(xp, p); |
1101 | |
1102 | err = copy_from_user_policy_type(&xp->type, attrs); |
1103 | if (err) |
1104 | goto error; |
1105 | |
1106 | if (!(err = copy_from_user_tmpl(xp, attrs))) |
1107 | err = copy_from_user_sec_ctx(xp, attrs); |
1108 | if (err) |
1109 | goto error; |
1110 | |
1111 | return xp; |
1112 | error: |
1113 | *errp = err; |
1114 | xp->walk.dead = 1; |
1115 | xfrm_policy_destroy(xp); |
1116 | return NULL; |
1117 | } |
1118 | |
1119 | static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh, |
1120 | struct nlattr **attrs) |
1121 | { |
1122 | struct net *net = sock_net(skb->sk); |
1123 | struct xfrm_userpolicy_info *p = nlmsg_data(nlh); |
1124 | struct xfrm_policy *xp; |
1125 | struct km_event c; |
1126 | int err; |
1127 | int excl; |
1128 | uid_t loginuid = NETLINK_CB(skb).loginuid; |
1129 | u32 sessionid = NETLINK_CB(skb).sessionid; |
1130 | u32 sid = NETLINK_CB(skb).sid; |
1131 | |
1132 | err = verify_newpolicy_info(p); |
1133 | if (err) |
1134 | return err; |
1135 | err = verify_sec_ctx_len(attrs); |
1136 | if (err) |
1137 | return err; |
1138 | |
1139 | xp = xfrm_policy_construct(net, p, attrs, &err); |
1140 | if (!xp) |
1141 | return err; |
1142 | |
1143 | /* shouldnt excl be based on nlh flags?? |
1144 | * Aha! this is anti-netlink really i.e more pfkey derived |
1145 | * in netlink excl is a flag and you wouldnt need |
1146 | * a type XFRM_MSG_UPDPOLICY - JHS */ |
1147 | excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY; |
1148 | err = xfrm_policy_insert(p->dir, xp, excl); |
1149 | xfrm_audit_policy_add(xp, err ? 0 : 1, loginuid, sessionid, sid); |
1150 | |
1151 | if (err) { |
1152 | security_xfrm_policy_free(xp->security); |
1153 | kfree(xp); |
1154 | return err; |
1155 | } |
1156 | |
1157 | c.event = nlh->nlmsg_type; |
1158 | c.seq = nlh->nlmsg_seq; |
1159 | c.pid = nlh->nlmsg_pid; |
1160 | km_policy_notify(xp, p->dir, &c); |
1161 | |
1162 | xfrm_pol_put(xp); |
1163 | |
1164 | return 0; |
1165 | } |
1166 | |
1167 | static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb) |
1168 | { |
1169 | struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH]; |
1170 | int i; |
1171 | |
1172 | if (xp->xfrm_nr == 0) |
1173 | return 0; |
1174 | |
1175 | for (i = 0; i < xp->xfrm_nr; i++) { |
1176 | struct xfrm_user_tmpl *up = &vec[i]; |
1177 | struct xfrm_tmpl *kp = &xp->xfrm_vec[i]; |
1178 | |
1179 | memcpy(&up->id, &kp->id, sizeof(up->id)); |
1180 | up->family = kp->encap_family; |
1181 | memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr)); |
1182 | up->reqid = kp->reqid; |
1183 | up->mode = kp->mode; |
1184 | up->share = kp->share; |
1185 | up->optional = kp->optional; |
1186 | up->aalgos = kp->aalgos; |
1187 | up->ealgos = kp->ealgos; |
1188 | up->calgos = kp->calgos; |
1189 | } |
1190 | |
1191 | return nla_put(skb, XFRMA_TMPL, |
1192 | sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec); |
1193 | } |
1194 | |
1195 | static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb) |
1196 | { |
1197 | if (x->security) { |
1198 | return copy_sec_ctx(x->security, skb); |
1199 | } |
1200 | return 0; |
1201 | } |
1202 | |
1203 | static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb) |
1204 | { |
1205 | if (xp->security) { |
1206 | return copy_sec_ctx(xp->security, skb); |
1207 | } |
1208 | return 0; |
1209 | } |
1210 | static inline size_t userpolicy_type_attrsize(void) |
1211 | { |
1212 | #ifdef CONFIG_XFRM_SUB_POLICY |
1213 | return nla_total_size(sizeof(struct xfrm_userpolicy_type)); |
1214 | #else |
1215 | return 0; |
1216 | #endif |
1217 | } |
1218 | |
1219 | #ifdef CONFIG_XFRM_SUB_POLICY |
1220 | static int copy_to_user_policy_type(u8 type, struct sk_buff *skb) |
1221 | { |
1222 | struct xfrm_userpolicy_type upt = { |
1223 | .type = type, |
1224 | }; |
1225 | |
1226 | return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt); |
1227 | } |
1228 | |
1229 | #else |
1230 | static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb) |
1231 | { |
1232 | return 0; |
1233 | } |
1234 | #endif |
1235 | |
1236 | static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr) |
1237 | { |
1238 | struct xfrm_dump_info *sp = ptr; |
1239 | struct xfrm_userpolicy_info *p; |
1240 | struct sk_buff *in_skb = sp->in_skb; |
1241 | struct sk_buff *skb = sp->out_skb; |
1242 | struct nlmsghdr *nlh; |
1243 | |
1244 | nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq, |
1245 | XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags); |
1246 | if (nlh == NULL) |
1247 | return -EMSGSIZE; |
1248 | |
1249 | p = nlmsg_data(nlh); |
1250 | copy_to_user_policy(xp, p, dir); |
1251 | if (copy_to_user_tmpl(xp, skb) < 0) |
1252 | goto nlmsg_failure; |
1253 | if (copy_to_user_sec_ctx(xp, skb)) |
1254 | goto nlmsg_failure; |
1255 | if (copy_to_user_policy_type(xp->type, skb) < 0) |
1256 | goto nlmsg_failure; |
1257 | |
1258 | nlmsg_end(skb, nlh); |
1259 | return 0; |
1260 | |
1261 | nlmsg_failure: |
1262 | nlmsg_cancel(skb, nlh); |
1263 | return -EMSGSIZE; |
1264 | } |
1265 | |
1266 | static int xfrm_dump_policy_done(struct netlink_callback *cb) |
1267 | { |
1268 | struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1]; |
1269 | |
1270 | xfrm_policy_walk_done(walk); |
1271 | return 0; |
1272 | } |
1273 | |
1274 | static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb) |
1275 | { |
1276 | struct net *net = sock_net(skb->sk); |
1277 | struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1]; |
1278 | struct xfrm_dump_info info; |
1279 | |
1280 | BUILD_BUG_ON(sizeof(struct xfrm_policy_walk) > |
1281 | sizeof(cb->args) - sizeof(cb->args[0])); |
1282 | |
1283 | info.in_skb = cb->skb; |
1284 | info.out_skb = skb; |
1285 | info.nlmsg_seq = cb->nlh->nlmsg_seq; |
1286 | info.nlmsg_flags = NLM_F_MULTI; |
1287 | |
1288 | if (!cb->args[0]) { |
1289 | cb->args[0] = 1; |
1290 | xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY); |
1291 | } |
1292 | |
1293 | (void) xfrm_policy_walk(net, walk, dump_one_policy, &info); |
1294 | |
1295 | return skb->len; |
1296 | } |
1297 | |
1298 | static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb, |
1299 | struct xfrm_policy *xp, |
1300 | int dir, u32 seq) |
1301 | { |
1302 | struct xfrm_dump_info info; |
1303 | struct sk_buff *skb; |
1304 | |
1305 | skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
1306 | if (!skb) |
1307 | return ERR_PTR(-ENOMEM); |
1308 | |
1309 | info.in_skb = in_skb; |
1310 | info.out_skb = skb; |
1311 | info.nlmsg_seq = seq; |
1312 | info.nlmsg_flags = 0; |
1313 | |
1314 | if (dump_one_policy(xp, dir, 0, &info) < 0) { |
1315 | kfree_skb(skb); |
1316 | return NULL; |
1317 | } |
1318 | |
1319 | return skb; |
1320 | } |
1321 | |
1322 | static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh, |
1323 | struct nlattr **attrs) |
1324 | { |
1325 | struct net *net = sock_net(skb->sk); |
1326 | struct xfrm_policy *xp; |
1327 | struct xfrm_userpolicy_id *p; |
1328 | u8 type = XFRM_POLICY_TYPE_MAIN; |
1329 | int err; |
1330 | struct km_event c; |
1331 | int delete; |
1332 | |
1333 | p = nlmsg_data(nlh); |
1334 | delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY; |
1335 | |
1336 | err = copy_from_user_policy_type(&type, attrs); |
1337 | if (err) |
1338 | return err; |
1339 | |
1340 | err = verify_policy_dir(p->dir); |
1341 | if (err) |
1342 | return err; |
1343 | |
1344 | if (p->index) |
1345 | xp = xfrm_policy_byid(net, type, p->dir, p->index, delete, &err); |
1346 | else { |
1347 | struct nlattr *rt = attrs[XFRMA_SEC_CTX]; |
1348 | struct xfrm_sec_ctx *ctx; |
1349 | |
1350 | err = verify_sec_ctx_len(attrs); |
1351 | if (err) |
1352 | return err; |
1353 | |
1354 | ctx = NULL; |
1355 | if (rt) { |
1356 | struct xfrm_user_sec_ctx *uctx = nla_data(rt); |
1357 | |
1358 | err = security_xfrm_policy_alloc(&ctx, uctx); |
1359 | if (err) |
1360 | return err; |
1361 | } |
1362 | xp = xfrm_policy_bysel_ctx(net, type, p->dir, &p->sel, ctx, |
1363 | delete, &err); |
1364 | security_xfrm_policy_free(ctx); |
1365 | } |
1366 | if (xp == NULL) |
1367 | return -ENOENT; |
1368 | |
1369 | if (!delete) { |
1370 | struct sk_buff *resp_skb; |
1371 | |
1372 | resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq); |
1373 | if (IS_ERR(resp_skb)) { |
1374 | err = PTR_ERR(resp_skb); |
1375 | } else { |
1376 | err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, |
1377 | NETLINK_CB(skb).pid); |
1378 | } |
1379 | } else { |
1380 | uid_t loginuid = NETLINK_CB(skb).loginuid; |
1381 | u32 sessionid = NETLINK_CB(skb).sessionid; |
1382 | u32 sid = NETLINK_CB(skb).sid; |
1383 | |
1384 | xfrm_audit_policy_delete(xp, err ? 0 : 1, loginuid, sessionid, |
1385 | sid); |
1386 | |
1387 | if (err != 0) |
1388 | goto out; |
1389 | |
1390 | c.data.byid = p->index; |
1391 | c.event = nlh->nlmsg_type; |
1392 | c.seq = nlh->nlmsg_seq; |
1393 | c.pid = nlh->nlmsg_pid; |
1394 | km_policy_notify(xp, p->dir, &c); |
1395 | } |
1396 | |
1397 | out: |
1398 | xfrm_pol_put(xp); |
1399 | return err; |
1400 | } |
1401 | |
1402 | static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh, |
1403 | struct nlattr **attrs) |
1404 | { |
1405 | struct net *net = sock_net(skb->sk); |
1406 | struct km_event c; |
1407 | struct xfrm_usersa_flush *p = nlmsg_data(nlh); |
1408 | struct xfrm_audit audit_info; |
1409 | int err; |
1410 | |
1411 | audit_info.loginuid = NETLINK_CB(skb).loginuid; |
1412 | audit_info.sessionid = NETLINK_CB(skb).sessionid; |
1413 | audit_info.secid = NETLINK_CB(skb).sid; |
1414 | err = xfrm_state_flush(net, p->proto, &audit_info); |
1415 | if (err) |
1416 | return err; |
1417 | c.data.proto = p->proto; |
1418 | c.event = nlh->nlmsg_type; |
1419 | c.seq = nlh->nlmsg_seq; |
1420 | c.pid = nlh->nlmsg_pid; |
1421 | c.net = net; |
1422 | km_state_notify(NULL, &c); |
1423 | |
1424 | return 0; |
1425 | } |
1426 | |
1427 | static inline size_t xfrm_aevent_msgsize(void) |
1428 | { |
1429 | return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id)) |
1430 | + nla_total_size(sizeof(struct xfrm_replay_state)) |
1431 | + nla_total_size(sizeof(struct xfrm_lifetime_cur)) |
1432 | + nla_total_size(4) /* XFRM_AE_RTHR */ |
1433 | + nla_total_size(4); /* XFRM_AE_ETHR */ |
1434 | } |
1435 | |
1436 | static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c) |
1437 | { |
1438 | struct xfrm_aevent_id *id; |
1439 | struct nlmsghdr *nlh; |
1440 | |
1441 | nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0); |
1442 | if (nlh == NULL) |
1443 | return -EMSGSIZE; |
1444 | |
1445 | id = nlmsg_data(nlh); |
1446 | memcpy(&id->sa_id.daddr, &x->id.daddr,sizeof(x->id.daddr)); |
1447 | id->sa_id.spi = x->id.spi; |
1448 | id->sa_id.family = x->props.family; |
1449 | id->sa_id.proto = x->id.proto; |
1450 | memcpy(&id->saddr, &x->props.saddr,sizeof(x->props.saddr)); |
1451 | id->reqid = x->props.reqid; |
1452 | id->flags = c->data.aevent; |
1453 | |
1454 | NLA_PUT(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), &x->replay); |
1455 | NLA_PUT(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft); |
1456 | |
1457 | if (id->flags & XFRM_AE_RTHR) |
1458 | NLA_PUT_U32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff); |
1459 | |
1460 | if (id->flags & XFRM_AE_ETHR) |
1461 | NLA_PUT_U32(skb, XFRMA_ETIMER_THRESH, |
1462 | x->replay_maxage * 10 / HZ); |
1463 | |
1464 | return nlmsg_end(skb, nlh); |
1465 | |
1466 | nla_put_failure: |
1467 | nlmsg_cancel(skb, nlh); |
1468 | return -EMSGSIZE; |
1469 | } |
1470 | |
1471 | static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh, |
1472 | struct nlattr **attrs) |
1473 | { |
1474 | struct net *net = sock_net(skb->sk); |
1475 | struct xfrm_state *x; |
1476 | struct sk_buff *r_skb; |
1477 | int err; |
1478 | struct km_event c; |
1479 | struct xfrm_aevent_id *p = nlmsg_data(nlh); |
1480 | struct xfrm_usersa_id *id = &p->sa_id; |
1481 | |
1482 | r_skb = nlmsg_new(xfrm_aevent_msgsize(), GFP_ATOMIC); |
1483 | if (r_skb == NULL) |
1484 | return -ENOMEM; |
1485 | |
1486 | x = xfrm_state_lookup(net, &id->daddr, id->spi, id->proto, id->family); |
1487 | if (x == NULL) { |
1488 | kfree_skb(r_skb); |
1489 | return -ESRCH; |
1490 | } |
1491 | |
1492 | /* |
1493 | * XXX: is this lock really needed - none of the other |
1494 | * gets lock (the concern is things getting updated |
1495 | * while we are still reading) - jhs |
1496 | */ |
1497 | spin_lock_bh(&x->lock); |
1498 | c.data.aevent = p->flags; |
1499 | c.seq = nlh->nlmsg_seq; |
1500 | c.pid = nlh->nlmsg_pid; |
1501 | |
1502 | if (build_aevent(r_skb, x, &c) < 0) |
1503 | BUG(); |
1504 | err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).pid); |
1505 | spin_unlock_bh(&x->lock); |
1506 | xfrm_state_put(x); |
1507 | return err; |
1508 | } |
1509 | |
1510 | static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh, |
1511 | struct nlattr **attrs) |
1512 | { |
1513 | struct net *net = sock_net(skb->sk); |
1514 | struct xfrm_state *x; |
1515 | struct km_event c; |
1516 | int err = - EINVAL; |
1517 | struct xfrm_aevent_id *p = nlmsg_data(nlh); |
1518 | struct nlattr *rp = attrs[XFRMA_REPLAY_VAL]; |
1519 | struct nlattr *lt = attrs[XFRMA_LTIME_VAL]; |
1520 | |
1521 | if (!lt && !rp) |
1522 | return err; |
1523 | |
1524 | /* pedantic mode - thou shalt sayeth replaceth */ |
1525 | if (!(nlh->nlmsg_flags&NLM_F_REPLACE)) |
1526 | return err; |
1527 | |
1528 | x = xfrm_state_lookup(net, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family); |
1529 | if (x == NULL) |
1530 | return -ESRCH; |
1531 | |
1532 | if (x->km.state != XFRM_STATE_VALID) |
1533 | goto out; |
1534 | |
1535 | spin_lock_bh(&x->lock); |
1536 | xfrm_update_ae_params(x, attrs); |
1537 | spin_unlock_bh(&x->lock); |
1538 | |
1539 | c.event = nlh->nlmsg_type; |
1540 | c.seq = nlh->nlmsg_seq; |
1541 | c.pid = nlh->nlmsg_pid; |
1542 | c.data.aevent = XFRM_AE_CU; |
1543 | km_state_notify(x, &c); |
1544 | err = 0; |
1545 | out: |
1546 | xfrm_state_put(x); |
1547 | return err; |
1548 | } |
1549 | |
1550 | static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh, |
1551 | struct nlattr **attrs) |
1552 | { |
1553 | struct net *net = sock_net(skb->sk); |
1554 | struct km_event c; |
1555 | u8 type = XFRM_POLICY_TYPE_MAIN; |
1556 | int err; |
1557 | struct xfrm_audit audit_info; |
1558 | |
1559 | err = copy_from_user_policy_type(&type, attrs); |
1560 | if (err) |
1561 | return err; |
1562 | |
1563 | audit_info.loginuid = NETLINK_CB(skb).loginuid; |
1564 | audit_info.sessionid = NETLINK_CB(skb).sessionid; |
1565 | audit_info.secid = NETLINK_CB(skb).sid; |
1566 | err = xfrm_policy_flush(net, type, &audit_info); |
1567 | if (err) |
1568 | return err; |
1569 | c.data.type = type; |
1570 | c.event = nlh->nlmsg_type; |
1571 | c.seq = nlh->nlmsg_seq; |
1572 | c.pid = nlh->nlmsg_pid; |
1573 | c.net = net; |
1574 | km_policy_notify(NULL, 0, &c); |
1575 | return 0; |
1576 | } |
1577 | |
1578 | static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh, |
1579 | struct nlattr **attrs) |
1580 | { |
1581 | struct net *net = sock_net(skb->sk); |
1582 | struct xfrm_policy *xp; |
1583 | struct xfrm_user_polexpire *up = nlmsg_data(nlh); |
1584 | struct xfrm_userpolicy_info *p = &up->pol; |
1585 | u8 type = XFRM_POLICY_TYPE_MAIN; |
1586 | int err = -ENOENT; |
1587 | |
1588 | err = copy_from_user_policy_type(&type, attrs); |
1589 | if (err) |
1590 | return err; |
1591 | |
1592 | if (p->index) |
1593 | xp = xfrm_policy_byid(net, type, p->dir, p->index, 0, &err); |
1594 | else { |
1595 | struct nlattr *rt = attrs[XFRMA_SEC_CTX]; |
1596 | struct xfrm_sec_ctx *ctx; |
1597 | |
1598 | err = verify_sec_ctx_len(attrs); |
1599 | if (err) |
1600 | return err; |
1601 | |
1602 | ctx = NULL; |
1603 | if (rt) { |
1604 | struct xfrm_user_sec_ctx *uctx = nla_data(rt); |
1605 | |
1606 | err = security_xfrm_policy_alloc(&ctx, uctx); |
1607 | if (err) |
1608 | return err; |
1609 | } |
1610 | xp = xfrm_policy_bysel_ctx(net, type, p->dir, &p->sel, ctx, 0, &err); |
1611 | security_xfrm_policy_free(ctx); |
1612 | } |
1613 | if (xp == NULL) |
1614 | return -ENOENT; |
1615 | |
1616 | read_lock(&xp->lock); |
1617 | if (xp->walk.dead) { |
1618 | read_unlock(&xp->lock); |
1619 | goto out; |
1620 | } |
1621 | |
1622 | read_unlock(&xp->lock); |
1623 | err = 0; |
1624 | if (up->hard) { |
1625 | uid_t loginuid = NETLINK_CB(skb).loginuid; |
1626 | uid_t sessionid = NETLINK_CB(skb).sessionid; |
1627 | u32 sid = NETLINK_CB(skb).sid; |
1628 | xfrm_policy_delete(xp, p->dir); |
1629 | xfrm_audit_policy_delete(xp, 1, loginuid, sessionid, sid); |
1630 | |
1631 | } else { |
1632 | // reset the timers here? |
1633 | printk("Dont know what to do with soft policy expire\n"); |
1634 | } |
1635 | km_policy_expired(xp, p->dir, up->hard, current->pid); |
1636 | |
1637 | out: |
1638 | xfrm_pol_put(xp); |
1639 | return err; |
1640 | } |
1641 | |
1642 | static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh, |
1643 | struct nlattr **attrs) |
1644 | { |
1645 | struct net *net = sock_net(skb->sk); |
1646 | struct xfrm_state *x; |
1647 | int err; |
1648 | struct xfrm_user_expire *ue = nlmsg_data(nlh); |
1649 | struct xfrm_usersa_info *p = &ue->state; |
1650 | |
1651 | x = xfrm_state_lookup(net, &p->id.daddr, p->id.spi, p->id.proto, p->family); |
1652 | |
1653 | err = -ENOENT; |
1654 | if (x == NULL) |
1655 | return err; |
1656 | |
1657 | spin_lock_bh(&x->lock); |
1658 | err = -EINVAL; |
1659 | if (x->km.state != XFRM_STATE_VALID) |
1660 | goto out; |
1661 | km_state_expired(x, ue->hard, current->pid); |
1662 | |
1663 | if (ue->hard) { |
1664 | uid_t loginuid = NETLINK_CB(skb).loginuid; |
1665 | uid_t sessionid = NETLINK_CB(skb).sessionid; |
1666 | u32 sid = NETLINK_CB(skb).sid; |
1667 | __xfrm_state_delete(x); |
1668 | xfrm_audit_state_delete(x, 1, loginuid, sessionid, sid); |
1669 | } |
1670 | err = 0; |
1671 | out: |
1672 | spin_unlock_bh(&x->lock); |
1673 | xfrm_state_put(x); |
1674 | return err; |
1675 | } |
1676 | |
1677 | static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh, |
1678 | struct nlattr **attrs) |
1679 | { |
1680 | struct net *net = sock_net(skb->sk); |
1681 | struct xfrm_policy *xp; |
1682 | struct xfrm_user_tmpl *ut; |
1683 | int i; |
1684 | struct nlattr *rt = attrs[XFRMA_TMPL]; |
1685 | |
1686 | struct xfrm_user_acquire *ua = nlmsg_data(nlh); |
1687 | struct xfrm_state *x = xfrm_state_alloc(net); |
1688 | int err = -ENOMEM; |
1689 | |
1690 | if (!x) |
1691 | goto nomem; |
1692 | |
1693 | err = verify_newpolicy_info(&ua->policy); |
1694 | if (err) |
1695 | goto bad_policy; |
1696 | |
1697 | /* build an XP */ |
1698 | xp = xfrm_policy_construct(net, &ua->policy, attrs, &err); |
1699 | if (!xp) |
1700 | goto free_state; |
1701 | |
1702 | memcpy(&x->id, &ua->id, sizeof(ua->id)); |
1703 | memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr)); |
1704 | memcpy(&x->sel, &ua->sel, sizeof(ua->sel)); |
1705 | |
1706 | ut = nla_data(rt); |
1707 | /* extract the templates and for each call km_key */ |
1708 | for (i = 0; i < xp->xfrm_nr; i++, ut++) { |
1709 | struct xfrm_tmpl *t = &xp->xfrm_vec[i]; |
1710 | memcpy(&x->id, &t->id, sizeof(x->id)); |
1711 | x->props.mode = t->mode; |
1712 | x->props.reqid = t->reqid; |
1713 | x->props.family = ut->family; |
1714 | t->aalgos = ua->aalgos; |
1715 | t->ealgos = ua->ealgos; |
1716 | t->calgos = ua->calgos; |
1717 | err = km_query(x, t, xp); |
1718 | |
1719 | } |
1720 | |
1721 | kfree(x); |
1722 | kfree(xp); |
1723 | |
1724 | return 0; |
1725 | |
1726 | bad_policy: |
1727 | printk("BAD policy passed\n"); |
1728 | free_state: |
1729 | kfree(x); |
1730 | nomem: |
1731 | return err; |
1732 | } |
1733 | |
1734 | #ifdef CONFIG_XFRM_MIGRATE |
1735 | static int copy_from_user_migrate(struct xfrm_migrate *ma, |
1736 | struct xfrm_kmaddress *k, |
1737 | struct nlattr **attrs, int *num) |
1738 | { |
1739 | struct nlattr *rt = attrs[XFRMA_MIGRATE]; |
1740 | struct xfrm_user_migrate *um; |
1741 | int i, num_migrate; |
1742 | |
1743 | if (k != NULL) { |
1744 | struct xfrm_user_kmaddress *uk; |
1745 | |
1746 | uk = nla_data(attrs[XFRMA_KMADDRESS]); |
1747 | memcpy(&k->local, &uk->local, sizeof(k->local)); |
1748 | memcpy(&k->remote, &uk->remote, sizeof(k->remote)); |
1749 | k->family = uk->family; |
1750 | k->reserved = uk->reserved; |
1751 | } |
1752 | |
1753 | um = nla_data(rt); |
1754 | num_migrate = nla_len(rt) / sizeof(*um); |
1755 | |
1756 | if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH) |
1757 | return -EINVAL; |
1758 | |
1759 | for (i = 0; i < num_migrate; i++, um++, ma++) { |
1760 | memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr)); |
1761 | memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr)); |
1762 | memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr)); |
1763 | memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr)); |
1764 | |
1765 | ma->proto = um->proto; |
1766 | ma->mode = um->mode; |
1767 | ma->reqid = um->reqid; |
1768 | |
1769 | ma->old_family = um->old_family; |
1770 | ma->new_family = um->new_family; |
1771 | } |
1772 | |
1773 | *num = i; |
1774 | return 0; |
1775 | } |
1776 | |
1777 | static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh, |
1778 | struct nlattr **attrs) |
1779 | { |
1780 | struct xfrm_userpolicy_id *pi = nlmsg_data(nlh); |
1781 | struct xfrm_migrate m[XFRM_MAX_DEPTH]; |
1782 | struct xfrm_kmaddress km, *kmp; |
1783 | u8 type; |
1784 | int err; |
1785 | int n = 0; |
1786 | |
1787 | if (attrs[XFRMA_MIGRATE] == NULL) |
1788 | return -EINVAL; |
1789 | |
1790 | kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL; |
1791 | |
1792 | err = copy_from_user_policy_type(&type, attrs); |
1793 | if (err) |
1794 | return err; |
1795 | |
1796 | err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n); |
1797 | if (err) |
1798 | return err; |
1799 | |
1800 | if (!n) |
1801 | return 0; |
1802 | |
1803 | xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp); |
1804 | |
1805 | return 0; |
1806 | } |
1807 | #else |
1808 | static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh, |
1809 | struct nlattr **attrs) |
1810 | { |
1811 | return -ENOPROTOOPT; |
1812 | } |
1813 | #endif |
1814 | |
1815 | #ifdef CONFIG_XFRM_MIGRATE |
1816 | static int copy_to_user_migrate(struct xfrm_migrate *m, struct sk_buff *skb) |
1817 | { |
1818 | struct xfrm_user_migrate um; |
1819 | |
1820 | memset(&um, 0, sizeof(um)); |
1821 | um.proto = m->proto; |
1822 | um.mode = m->mode; |
1823 | um.reqid = m->reqid; |
1824 | um.old_family = m->old_family; |
1825 | memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr)); |
1826 | memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr)); |
1827 | um.new_family = m->new_family; |
1828 | memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr)); |
1829 | memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr)); |
1830 | |
1831 | return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um); |
1832 | } |
1833 | |
1834 | static int copy_to_user_kmaddress(struct xfrm_kmaddress *k, struct sk_buff *skb) |
1835 | { |
1836 | struct xfrm_user_kmaddress uk; |
1837 | |
1838 | memset(&uk, 0, sizeof(uk)); |
1839 | uk.family = k->family; |
1840 | uk.reserved = k->reserved; |
1841 | memcpy(&uk.local, &k->local, sizeof(uk.local)); |
1842 | memcpy(&uk.remote, &k->remote, sizeof(uk.remote)); |
1843 | |
1844 | return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk); |
1845 | } |
1846 | |
1847 | static inline size_t xfrm_migrate_msgsize(int num_migrate, int with_kma) |
1848 | { |
1849 | return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id)) |
1850 | + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0) |
1851 | + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate) |
1852 | + userpolicy_type_attrsize(); |
1853 | } |
1854 | |
1855 | static int build_migrate(struct sk_buff *skb, struct xfrm_migrate *m, |
1856 | int num_migrate, struct xfrm_kmaddress *k, |
1857 | struct xfrm_selector *sel, u8 dir, u8 type) |
1858 | { |
1859 | struct xfrm_migrate *mp; |
1860 | struct xfrm_userpolicy_id *pol_id; |
1861 | struct nlmsghdr *nlh; |
1862 | int i; |
1863 | |
1864 | nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0); |
1865 | if (nlh == NULL) |
1866 | return -EMSGSIZE; |
1867 | |
1868 | pol_id = nlmsg_data(nlh); |
1869 | /* copy data from selector, dir, and type to the pol_id */ |
1870 | memset(pol_id, 0, sizeof(*pol_id)); |
1871 | memcpy(&pol_id->sel, sel, sizeof(pol_id->sel)); |
1872 | pol_id->dir = dir; |
1873 | |
1874 | if (k != NULL && (copy_to_user_kmaddress(k, skb) < 0)) |
1875 | goto nlmsg_failure; |
1876 | |
1877 | if (copy_to_user_policy_type(type, skb) < 0) |
1878 | goto nlmsg_failure; |
1879 | |
1880 | for (i = 0, mp = m ; i < num_migrate; i++, mp++) { |
1881 | if (copy_to_user_migrate(mp, skb) < 0) |
1882 | goto nlmsg_failure; |
1883 | } |
1884 | |
1885 | return nlmsg_end(skb, nlh); |
1886 | nlmsg_failure: |
1887 | nlmsg_cancel(skb, nlh); |
1888 | return -EMSGSIZE; |
1889 | } |
1890 | |
1891 | static int xfrm_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type, |
1892 | struct xfrm_migrate *m, int num_migrate, |
1893 | struct xfrm_kmaddress *k) |
1894 | { |
1895 | struct net *net = &init_net; |
1896 | struct sk_buff *skb; |
1897 | |
1898 | skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k), GFP_ATOMIC); |
1899 | if (skb == NULL) |
1900 | return -ENOMEM; |
1901 | |
1902 | /* build migrate */ |
1903 | if (build_migrate(skb, m, num_migrate, k, sel, dir, type) < 0) |
1904 | BUG(); |
1905 | |
1906 | return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MIGRATE, GFP_ATOMIC); |
1907 | } |
1908 | #else |
1909 | static int xfrm_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type, |
1910 | struct xfrm_migrate *m, int num_migrate, |
1911 | struct xfrm_kmaddress *k) |
1912 | { |
1913 | return -ENOPROTOOPT; |
1914 | } |
1915 | #endif |
1916 | |
1917 | #define XMSGSIZE(type) sizeof(struct type) |
1918 | |
1919 | static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = { |
1920 | [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), |
1921 | [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), |
1922 | [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), |
1923 | [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), |
1924 | [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), |
1925 | [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), |
1926 | [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info), |
1927 | [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire), |
1928 | [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire), |
1929 | [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), |
1930 | [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), |
1931 | [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire), |
1932 | [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush), |
1933 | [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0, |
1934 | [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), |
1935 | [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), |
1936 | [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report), |
1937 | [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), |
1938 | [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32), |
1939 | [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32), |
1940 | }; |
1941 | |
1942 | #undef XMSGSIZE |
1943 | |
1944 | static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = { |
1945 | [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) }, |
1946 | [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) }, |
1947 | [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) }, |
1948 | [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) }, |
1949 | [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) }, |
1950 | [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) }, |
1951 | [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) }, |
1952 | [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) }, |
1953 | [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) }, |
1954 | [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 }, |
1955 | [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 }, |
1956 | [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) }, |
1957 | [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) }, |
1958 | [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)}, |
1959 | [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) }, |
1960 | [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) }, |
1961 | }; |
1962 | |
1963 | static struct xfrm_link { |
1964 | int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **); |
1965 | int (*dump)(struct sk_buff *, struct netlink_callback *); |
1966 | int (*done)(struct netlink_callback *); |
1967 | } xfrm_dispatch[XFRM_NR_MSGTYPES] = { |
1968 | [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, |
1969 | [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa }, |
1970 | [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa, |
1971 | .dump = xfrm_dump_sa, |
1972 | .done = xfrm_dump_sa_done }, |
1973 | [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, |
1974 | [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy }, |
1975 | [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy, |
1976 | .dump = xfrm_dump_policy, |
1977 | .done = xfrm_dump_policy_done }, |
1978 | [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi }, |
1979 | [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire }, |
1980 | [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire }, |
1981 | [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, |
1982 | [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, |
1983 | [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire}, |
1984 | [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa }, |
1985 | [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy }, |
1986 | [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae }, |
1987 | [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae }, |
1988 | [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate }, |
1989 | [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo }, |
1990 | [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo }, |
1991 | }; |
1992 | |
1993 | static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) |
1994 | { |
1995 | struct net *net = sock_net(skb->sk); |
1996 | struct nlattr *attrs[XFRMA_MAX+1]; |
1997 | struct xfrm_link *link; |
1998 | int type, err; |
1999 | |
2000 | type = nlh->nlmsg_type; |
2001 | if (type > XFRM_MSG_MAX) |
2002 | return -EINVAL; |
2003 | |
2004 | type -= XFRM_MSG_BASE; |
2005 | link = &xfrm_dispatch[type]; |
2006 | |
2007 | /* All operations require privileges, even GET */ |
2008 | if (security_netlink_recv(skb, CAP_NET_ADMIN)) |
2009 | return -EPERM; |
2010 | |
2011 | if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) || |
2012 | type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) && |
2013 | (nlh->nlmsg_flags & NLM_F_DUMP)) { |
2014 | if (link->dump == NULL) |
2015 | return -EINVAL; |
2016 | |
2017 | return netlink_dump_start(net->xfrm.nlsk, skb, nlh, link->dump, link->done); |
2018 | } |
2019 | |
2020 | err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs, XFRMA_MAX, |
2021 | xfrma_policy); |
2022 | if (err < 0) |
2023 | return err; |
2024 | |
2025 | if (link->doit == NULL) |
2026 | return -EINVAL; |
2027 | |
2028 | return link->doit(skb, nlh, attrs); |
2029 | } |
2030 | |
2031 | static void xfrm_netlink_rcv(struct sk_buff *skb) |
2032 | { |
2033 | mutex_lock(&xfrm_cfg_mutex); |
2034 | netlink_rcv_skb(skb, &xfrm_user_rcv_msg); |
2035 | mutex_unlock(&xfrm_cfg_mutex); |
2036 | } |
2037 | |
2038 | static inline size_t xfrm_expire_msgsize(void) |
2039 | { |
2040 | return NLMSG_ALIGN(sizeof(struct xfrm_user_expire)); |
2041 | } |
2042 | |
2043 | static int build_expire(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c) |
2044 | { |
2045 | struct xfrm_user_expire *ue; |
2046 | struct nlmsghdr *nlh; |
2047 | |
2048 | nlh = nlmsg_put(skb, c->pid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0); |
2049 | if (nlh == NULL) |
2050 | return -EMSGSIZE; |
2051 | |
2052 | ue = nlmsg_data(nlh); |
2053 | copy_to_user_state(x, &ue->state); |
2054 | ue->hard = (c->data.hard != 0) ? 1 : 0; |
2055 | |
2056 | return nlmsg_end(skb, nlh); |
2057 | } |
2058 | |
2059 | static int xfrm_exp_state_notify(struct xfrm_state *x, struct km_event *c) |
2060 | { |
2061 | struct net *net = xs_net(x); |
2062 | struct sk_buff *skb; |
2063 | |
2064 | skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC); |
2065 | if (skb == NULL) |
2066 | return -ENOMEM; |
2067 | |
2068 | if (build_expire(skb, x, c) < 0) |
2069 | BUG(); |
2070 | |
2071 | return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC); |
2072 | } |
2073 | |
2074 | static int xfrm_aevent_state_notify(struct xfrm_state *x, struct km_event *c) |
2075 | { |
2076 | struct net *net = xs_net(x); |
2077 | struct sk_buff *skb; |
2078 | |
2079 | skb = nlmsg_new(xfrm_aevent_msgsize(), GFP_ATOMIC); |
2080 | if (skb == NULL) |
2081 | return -ENOMEM; |
2082 | |
2083 | if (build_aevent(skb, x, c) < 0) |
2084 | BUG(); |
2085 | |
2086 | return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_AEVENTS, GFP_ATOMIC); |
2087 | } |
2088 | |
2089 | static int xfrm_notify_sa_flush(struct km_event *c) |
2090 | { |
2091 | struct net *net = c->net; |
2092 | struct xfrm_usersa_flush *p; |
2093 | struct nlmsghdr *nlh; |
2094 | struct sk_buff *skb; |
2095 | int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush)); |
2096 | |
2097 | skb = nlmsg_new(len, GFP_ATOMIC); |
2098 | if (skb == NULL) |
2099 | return -ENOMEM; |
2100 | |
2101 | nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0); |
2102 | if (nlh == NULL) { |
2103 | kfree_skb(skb); |
2104 | return -EMSGSIZE; |
2105 | } |
2106 | |
2107 | p = nlmsg_data(nlh); |
2108 | p->proto = c->data.proto; |
2109 | |
2110 | nlmsg_end(skb, nlh); |
2111 | |
2112 | return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC); |
2113 | } |
2114 | |
2115 | static inline size_t xfrm_sa_len(struct xfrm_state *x) |
2116 | { |
2117 | size_t l = 0; |
2118 | if (x->aead) |
2119 | l += nla_total_size(aead_len(x->aead)); |
2120 | if (x->aalg) |
2121 | l += nla_total_size(xfrm_alg_len(x->aalg)); |
2122 | if (x->ealg) |
2123 | l += nla_total_size(xfrm_alg_len(x->ealg)); |
2124 | if (x->calg) |
2125 | l += nla_total_size(sizeof(*x->calg)); |
2126 | if (x->encap) |
2127 | l += nla_total_size(sizeof(*x->encap)); |
2128 | if (x->security) |
2129 | l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) + |
2130 | x->security->ctx_len); |
2131 | if (x->coaddr) |
2132 | l += nla_total_size(sizeof(*x->coaddr)); |
2133 | |
2134 | /* Must count x->lastused as it may become non-zero behind our back. */ |
2135 | l += nla_total_size(sizeof(u64)); |
2136 | |
2137 | return l; |
2138 | } |
2139 | |
2140 | static int xfrm_notify_sa(struct xfrm_state *x, struct km_event *c) |
2141 | { |
2142 | struct net *net = xs_net(x); |
2143 | struct xfrm_usersa_info *p; |
2144 | struct xfrm_usersa_id *id; |
2145 | struct nlmsghdr *nlh; |
2146 | struct sk_buff *skb; |
2147 | int len = xfrm_sa_len(x); |
2148 | int headlen; |
2149 | |
2150 | headlen = sizeof(*p); |
2151 | if (c->event == XFRM_MSG_DELSA) { |
2152 | len += nla_total_size(headlen); |
2153 | headlen = sizeof(*id); |
2154 | } |
2155 | len += NLMSG_ALIGN(headlen); |
2156 | |
2157 | skb = nlmsg_new(len, GFP_ATOMIC); |
2158 | if (skb == NULL) |
2159 | return -ENOMEM; |
2160 | |
2161 | nlh = nlmsg_put(skb, c->pid, c->seq, c->event, headlen, 0); |
2162 | if (nlh == NULL) |
2163 | goto nla_put_failure; |
2164 | |
2165 | p = nlmsg_data(nlh); |
2166 | if (c->event == XFRM_MSG_DELSA) { |
2167 | struct nlattr *attr; |
2168 | |
2169 | id = nlmsg_data(nlh); |
2170 | memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr)); |
2171 | id->spi = x->id.spi; |
2172 | id->family = x->props.family; |
2173 | id->proto = x->id.proto; |
2174 | |
2175 | attr = nla_reserve(skb, XFRMA_SA, sizeof(*p)); |
2176 | if (attr == NULL) |
2177 | goto nla_put_failure; |
2178 | |
2179 | p = nla_data(attr); |
2180 | } |
2181 | |
2182 | if (copy_to_user_state_extra(x, p, skb)) |
2183 | goto nla_put_failure; |
2184 | |
2185 | nlmsg_end(skb, nlh); |
2186 | |
2187 | return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC); |
2188 | |
2189 | nla_put_failure: |
2190 | /* Somebody screwed up with xfrm_sa_len! */ |
2191 | WARN_ON(1); |
2192 | kfree_skb(skb); |
2193 | return -1; |
2194 | } |
2195 | |
2196 | static int xfrm_send_state_notify(struct xfrm_state *x, struct km_event *c) |
2197 | { |
2198 | |
2199 | switch (c->event) { |
2200 | case XFRM_MSG_EXPIRE: |
2201 | return xfrm_exp_state_notify(x, c); |
2202 | case XFRM_MSG_NEWAE: |
2203 | return xfrm_aevent_state_notify(x, c); |
2204 | case XFRM_MSG_DELSA: |
2205 | case XFRM_MSG_UPDSA: |
2206 | case XFRM_MSG_NEWSA: |
2207 | return xfrm_notify_sa(x, c); |
2208 | case XFRM_MSG_FLUSHSA: |
2209 | return xfrm_notify_sa_flush(c); |
2210 | default: |
2211 | printk("xfrm_user: Unknown SA event %d\n", c->event); |
2212 | break; |
2213 | } |
2214 | |
2215 | return 0; |
2216 | |
2217 | } |
2218 | |
2219 | static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x, |
2220 | struct xfrm_policy *xp) |
2221 | { |
2222 | return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire)) |
2223 | + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr) |
2224 | + nla_total_size(xfrm_user_sec_ctx_size(x->security)) |
2225 | + userpolicy_type_attrsize(); |
2226 | } |
2227 | |
2228 | static int build_acquire(struct sk_buff *skb, struct xfrm_state *x, |
2229 | struct xfrm_tmpl *xt, struct xfrm_policy *xp, |
2230 | int dir) |
2231 | { |
2232 | struct xfrm_user_acquire *ua; |
2233 | struct nlmsghdr *nlh; |
2234 | __u32 seq = xfrm_get_acqseq(); |
2235 | |
2236 | nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0); |
2237 | if (nlh == NULL) |
2238 | return -EMSGSIZE; |
2239 | |
2240 | ua = nlmsg_data(nlh); |
2241 | memcpy(&ua->id, &x->id, sizeof(ua->id)); |
2242 | memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr)); |
2243 | memcpy(&ua->sel, &x->sel, sizeof(ua->sel)); |
2244 | copy_to_user_policy(xp, &ua->policy, dir); |
2245 | ua->aalgos = xt->aalgos; |
2246 | ua->ealgos = xt->ealgos; |
2247 | ua->calgos = xt->calgos; |
2248 | ua->seq = x->km.seq = seq; |
2249 | |
2250 | if (copy_to_user_tmpl(xp, skb) < 0) |
2251 | goto nlmsg_failure; |
2252 | if (copy_to_user_state_sec_ctx(x, skb)) |
2253 | goto nlmsg_failure; |
2254 | if (copy_to_user_policy_type(xp->type, skb) < 0) |
2255 | goto nlmsg_failure; |
2256 | |
2257 | return nlmsg_end(skb, nlh); |
2258 | |
2259 | nlmsg_failure: |
2260 | nlmsg_cancel(skb, nlh); |
2261 | return -EMSGSIZE; |
2262 | } |
2263 | |
2264 | static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt, |
2265 | struct xfrm_policy *xp, int dir) |
2266 | { |
2267 | struct net *net = xs_net(x); |
2268 | struct sk_buff *skb; |
2269 | |
2270 | skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC); |
2271 | if (skb == NULL) |
2272 | return -ENOMEM; |
2273 | |
2274 | if (build_acquire(skb, x, xt, xp, dir) < 0) |
2275 | BUG(); |
2276 | |
2277 | return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_ACQUIRE, GFP_ATOMIC); |
2278 | } |
2279 | |
2280 | /* User gives us xfrm_user_policy_info followed by an array of 0 |
2281 | * or more templates. |
2282 | */ |
2283 | static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt, |
2284 | u8 *data, int len, int *dir) |
2285 | { |
2286 | struct net *net = sock_net(sk); |
2287 | struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data; |
2288 | struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1); |
2289 | struct xfrm_policy *xp; |
2290 | int nr; |
2291 | |
2292 | switch (sk->sk_family) { |
2293 | case AF_INET: |
2294 | if (opt != IP_XFRM_POLICY) { |
2295 | *dir = -EOPNOTSUPP; |
2296 | return NULL; |
2297 | } |
2298 | break; |
2299 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
2300 | case AF_INET6: |
2301 | if (opt != IPV6_XFRM_POLICY) { |
2302 | *dir = -EOPNOTSUPP; |
2303 | return NULL; |
2304 | } |
2305 | break; |
2306 | #endif |
2307 | default: |
2308 | *dir = -EINVAL; |
2309 | return NULL; |
2310 | } |
2311 | |
2312 | *dir = -EINVAL; |
2313 | |
2314 | if (len < sizeof(*p) || |
2315 | verify_newpolicy_info(p)) |
2316 | return NULL; |
2317 | |
2318 | nr = ((len - sizeof(*p)) / sizeof(*ut)); |
2319 | if (validate_tmpl(nr, ut, p->sel.family)) |
2320 | return NULL; |
2321 | |
2322 | if (p->dir > XFRM_POLICY_OUT) |
2323 | return NULL; |
2324 | |
2325 | xp = xfrm_policy_alloc(net, GFP_KERNEL); |
2326 | if (xp == NULL) { |
2327 | *dir = -ENOBUFS; |
2328 | return NULL; |
2329 | } |
2330 | |
2331 | copy_from_user_policy(xp, p); |
2332 | xp->type = XFRM_POLICY_TYPE_MAIN; |
2333 | copy_templates(xp, ut, nr); |
2334 | |
2335 | *dir = p->dir; |
2336 | |
2337 | return xp; |
2338 | } |
2339 | |
2340 | static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp) |
2341 | { |
2342 | return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire)) |
2343 | + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr) |
2344 | + nla_total_size(xfrm_user_sec_ctx_size(xp->security)) |
2345 | + userpolicy_type_attrsize(); |
2346 | } |
2347 | |
2348 | static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp, |
2349 | int dir, struct km_event *c) |
2350 | { |
2351 | struct xfrm_user_polexpire *upe; |
2352 | struct nlmsghdr *nlh; |
2353 | int hard = c->data.hard; |
2354 | |
2355 | nlh = nlmsg_put(skb, c->pid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0); |
2356 | if (nlh == NULL) |
2357 | return -EMSGSIZE; |
2358 | |
2359 | upe = nlmsg_data(nlh); |
2360 | copy_to_user_policy(xp, &upe->pol, dir); |
2361 | if (copy_to_user_tmpl(xp, skb) < 0) |
2362 | goto nlmsg_failure; |
2363 | if (copy_to_user_sec_ctx(xp, skb)) |
2364 | goto nlmsg_failure; |
2365 | if (copy_to_user_policy_type(xp->type, skb) < 0) |
2366 | goto nlmsg_failure; |
2367 | upe->hard = !!hard; |
2368 | |
2369 | return nlmsg_end(skb, nlh); |
2370 | |
2371 | nlmsg_failure: |
2372 | nlmsg_cancel(skb, nlh); |
2373 | return -EMSGSIZE; |
2374 | } |
2375 | |
2376 | static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c) |
2377 | { |
2378 | struct net *net = xp_net(xp); |
2379 | struct sk_buff *skb; |
2380 | |
2381 | skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC); |
2382 | if (skb == NULL) |
2383 | return -ENOMEM; |
2384 | |
2385 | if (build_polexpire(skb, xp, dir, c) < 0) |
2386 | BUG(); |
2387 | |
2388 | return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC); |
2389 | } |
2390 | |
2391 | static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c) |
2392 | { |
2393 | struct net *net = xp_net(xp); |
2394 | struct xfrm_userpolicy_info *p; |
2395 | struct xfrm_userpolicy_id *id; |
2396 | struct nlmsghdr *nlh; |
2397 | struct sk_buff *skb; |
2398 | int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr); |
2399 | int headlen; |
2400 | |
2401 | headlen = sizeof(*p); |
2402 | if (c->event == XFRM_MSG_DELPOLICY) { |
2403 | len += nla_total_size(headlen); |
2404 | headlen = sizeof(*id); |
2405 | } |
2406 | len += userpolicy_type_attrsize(); |
2407 | len += NLMSG_ALIGN(headlen); |
2408 | |
2409 | skb = nlmsg_new(len, GFP_ATOMIC); |
2410 | if (skb == NULL) |
2411 | return -ENOMEM; |
2412 | |
2413 | nlh = nlmsg_put(skb, c->pid, c->seq, c->event, headlen, 0); |
2414 | if (nlh == NULL) |
2415 | goto nlmsg_failure; |
2416 | |
2417 | p = nlmsg_data(nlh); |
2418 | if (c->event == XFRM_MSG_DELPOLICY) { |
2419 | struct nlattr *attr; |
2420 | |
2421 | id = nlmsg_data(nlh); |
2422 | memset(id, 0, sizeof(*id)); |
2423 | id->dir = dir; |
2424 | if (c->data.byid) |
2425 | id->index = xp->index; |
2426 | else |
2427 | memcpy(&id->sel, &xp->selector, sizeof(id->sel)); |
2428 | |
2429 | attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p)); |
2430 | if (attr == NULL) |
2431 | goto nlmsg_failure; |
2432 | |
2433 | p = nla_data(attr); |
2434 | } |
2435 | |
2436 | copy_to_user_policy(xp, p, dir); |
2437 | if (copy_to_user_tmpl(xp, skb) < 0) |
2438 | goto nlmsg_failure; |
2439 | if (copy_to_user_policy_type(xp->type, skb) < 0) |
2440 | goto nlmsg_failure; |
2441 | |
2442 | nlmsg_end(skb, nlh); |
2443 | |
2444 | return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC); |
2445 | |
2446 | nlmsg_failure: |
2447 | kfree_skb(skb); |
2448 | return -1; |
2449 | } |
2450 | |
2451 | static int xfrm_notify_policy_flush(struct km_event *c) |
2452 | { |
2453 | struct net *net = c->net; |
2454 | struct nlmsghdr *nlh; |
2455 | struct sk_buff *skb; |
2456 | |
2457 | skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC); |
2458 | if (skb == NULL) |
2459 | return -ENOMEM; |
2460 | |
2461 | nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0); |
2462 | if (nlh == NULL) |
2463 | goto nlmsg_failure; |
2464 | if (copy_to_user_policy_type(c->data.type, skb) < 0) |
2465 | goto nlmsg_failure; |
2466 | |
2467 | nlmsg_end(skb, nlh); |
2468 | |
2469 | return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC); |
2470 | |
2471 | nlmsg_failure: |
2472 | kfree_skb(skb); |
2473 | return -1; |
2474 | } |
2475 | |
2476 | static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c) |
2477 | { |
2478 | |
2479 | switch (c->event) { |
2480 | case XFRM_MSG_NEWPOLICY: |
2481 | case XFRM_MSG_UPDPOLICY: |
2482 | case XFRM_MSG_DELPOLICY: |
2483 | return xfrm_notify_policy(xp, dir, c); |
2484 | case XFRM_MSG_FLUSHPOLICY: |
2485 | return xfrm_notify_policy_flush(c); |
2486 | case XFRM_MSG_POLEXPIRE: |
2487 | return xfrm_exp_policy_notify(xp, dir, c); |
2488 | default: |
2489 | printk("xfrm_user: Unknown Policy event %d\n", c->event); |
2490 | } |
2491 | |
2492 | return 0; |
2493 | |
2494 | } |
2495 | |
2496 | static inline size_t xfrm_report_msgsize(void) |
2497 | { |
2498 | return NLMSG_ALIGN(sizeof(struct xfrm_user_report)); |
2499 | } |
2500 | |
2501 | static int build_report(struct sk_buff *skb, u8 proto, |
2502 | struct xfrm_selector *sel, xfrm_address_t *addr) |
2503 | { |
2504 | struct xfrm_user_report *ur; |
2505 | struct nlmsghdr *nlh; |
2506 | |
2507 | nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0); |
2508 | if (nlh == NULL) |
2509 | return -EMSGSIZE; |
2510 | |
2511 | ur = nlmsg_data(nlh); |
2512 | ur->proto = proto; |
2513 | memcpy(&ur->sel, sel, sizeof(ur->sel)); |
2514 | |
2515 | if (addr) |
2516 | NLA_PUT(skb, XFRMA_COADDR, sizeof(*addr), addr); |
2517 | |
2518 | return nlmsg_end(skb, nlh); |
2519 | |
2520 | nla_put_failure: |
2521 | nlmsg_cancel(skb, nlh); |
2522 | return -EMSGSIZE; |
2523 | } |
2524 | |
2525 | static int xfrm_send_report(struct net *net, u8 proto, |
2526 | struct xfrm_selector *sel, xfrm_address_t *addr) |
2527 | { |
2528 | struct sk_buff *skb; |
2529 | |
2530 | skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC); |
2531 | if (skb == NULL) |
2532 | return -ENOMEM; |
2533 | |
2534 | if (build_report(skb, proto, sel, addr) < 0) |
2535 | BUG(); |
2536 | |
2537 | return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_REPORT, GFP_ATOMIC); |
2538 | } |
2539 | |
2540 | static inline size_t xfrm_mapping_msgsize(void) |
2541 | { |
2542 | return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping)); |
2543 | } |
2544 | |
2545 | static int build_mapping(struct sk_buff *skb, struct xfrm_state *x, |
2546 | xfrm_address_t *new_saddr, __be16 new_sport) |
2547 | { |
2548 | struct xfrm_user_mapping *um; |
2549 | struct nlmsghdr *nlh; |
2550 | |
2551 | nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0); |
2552 | if (nlh == NULL) |
2553 | return -EMSGSIZE; |
2554 | |
2555 | um = nlmsg_data(nlh); |
2556 | |
2557 | memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr)); |
2558 | um->id.spi = x->id.spi; |
2559 | um->id.family = x->props.family; |
2560 | um->id.proto = x->id.proto; |
2561 | memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr)); |
2562 | memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr)); |
2563 | um->new_sport = new_sport; |
2564 | um->old_sport = x->encap->encap_sport; |
2565 | um->reqid = x->props.reqid; |
2566 | |
2567 | return nlmsg_end(skb, nlh); |
2568 | } |
2569 | |
2570 | static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, |
2571 | __be16 sport) |
2572 | { |
2573 | struct net *net = xs_net(x); |
2574 | struct sk_buff *skb; |
2575 | |
2576 | if (x->id.proto != IPPROTO_ESP) |
2577 | return -EINVAL; |
2578 | |
2579 | if (!x->encap) |
2580 | return -EINVAL; |
2581 | |
2582 | skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC); |
2583 | if (skb == NULL) |
2584 | return -ENOMEM; |
2585 | |
2586 | if (build_mapping(skb, x, ipaddr, sport) < 0) |
2587 | BUG(); |
2588 | |
2589 | return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MAPPING, GFP_ATOMIC); |
2590 | } |
2591 | |
2592 | static struct xfrm_mgr netlink_mgr = { |
2593 | .id = "netlink", |
2594 | .notify = xfrm_send_state_notify, |
2595 | .acquire = xfrm_send_acquire, |
2596 | .compile_policy = xfrm_compile_policy, |
2597 | .notify_policy = xfrm_send_policy_notify, |
2598 | .report = xfrm_send_report, |
2599 | .migrate = xfrm_send_migrate, |
2600 | .new_mapping = xfrm_send_mapping, |
2601 | }; |
2602 | |
2603 | static int __net_init xfrm_user_net_init(struct net *net) |
2604 | { |
2605 | struct sock *nlsk; |
2606 | |
2607 | nlsk = netlink_kernel_create(net, NETLINK_XFRM, XFRMNLGRP_MAX, |
2608 | xfrm_netlink_rcv, NULL, THIS_MODULE); |
2609 | if (nlsk == NULL) |
2610 | return -ENOMEM; |
2611 | rcu_assign_pointer(net->xfrm.nlsk, nlsk); |
2612 | return 0; |
2613 | } |
2614 | |
2615 | static void __net_exit xfrm_user_net_exit(struct net *net) |
2616 | { |
2617 | struct sock *nlsk = net->xfrm.nlsk; |
2618 | |
2619 | rcu_assign_pointer(net->xfrm.nlsk, NULL); |
2620 | synchronize_rcu(); |
2621 | netlink_kernel_release(nlsk); |
2622 | } |
2623 | |
2624 | static struct pernet_operations xfrm_user_net_ops = { |
2625 | .init = xfrm_user_net_init, |
2626 | .exit = xfrm_user_net_exit, |
2627 | }; |
2628 | |
2629 | static int __init xfrm_user_init(void) |
2630 | { |
2631 | int rv; |
2632 | |
2633 | printk(KERN_INFO "Initializing XFRM netlink socket\n"); |
2634 | |
2635 | rv = register_pernet_subsys(&xfrm_user_net_ops); |
2636 | if (rv < 0) |
2637 | return rv; |
2638 | rv = xfrm_register_km(&netlink_mgr); |
2639 | if (rv < 0) |
2640 | unregister_pernet_subsys(&xfrm_user_net_ops); |
2641 | return rv; |
2642 | } |
2643 | |
2644 | static void __exit xfrm_user_exit(void) |
2645 | { |
2646 | xfrm_unregister_km(&netlink_mgr); |
2647 | unregister_pernet_subsys(&xfrm_user_net_ops); |
2648 | } |
2649 | |
2650 | module_init(xfrm_user_init); |
2651 | module_exit(xfrm_user_exit); |
2652 | MODULE_LICENSE("GPL"); |
2653 | MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM); |
2654 | |
2655 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9