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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_auth_trunc(struct nlattr **attrs) |
66 | { |
67 | struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC]; |
68 | struct xfrm_algo_auth *algp; |
69 | |
70 | if (!rt) |
71 | return 0; |
72 | |
73 | algp = nla_data(rt); |
74 | if (nla_len(rt) < xfrm_alg_auth_len(algp)) |
75 | return -EINVAL; |
76 | |
77 | algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0'; |
78 | return 0; |
79 | } |
80 | |
81 | static int verify_aead(struct nlattr **attrs) |
82 | { |
83 | struct nlattr *rt = attrs[XFRMA_ALG_AEAD]; |
84 | struct xfrm_algo_aead *algp; |
85 | |
86 | if (!rt) |
87 | return 0; |
88 | |
89 | algp = nla_data(rt); |
90 | if (nla_len(rt) < aead_len(algp)) |
91 | return -EINVAL; |
92 | |
93 | algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0'; |
94 | return 0; |
95 | } |
96 | |
97 | static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type, |
98 | xfrm_address_t **addrp) |
99 | { |
100 | struct nlattr *rt = attrs[type]; |
101 | |
102 | if (rt && addrp) |
103 | *addrp = nla_data(rt); |
104 | } |
105 | |
106 | static inline int verify_sec_ctx_len(struct nlattr **attrs) |
107 | { |
108 | struct nlattr *rt = attrs[XFRMA_SEC_CTX]; |
109 | struct xfrm_user_sec_ctx *uctx; |
110 | |
111 | if (!rt) |
112 | return 0; |
113 | |
114 | uctx = nla_data(rt); |
115 | if (uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len)) |
116 | return -EINVAL; |
117 | |
118 | return 0; |
119 | } |
120 | |
121 | |
122 | static int verify_newsa_info(struct xfrm_usersa_info *p, |
123 | struct nlattr **attrs) |
124 | { |
125 | int err; |
126 | |
127 | err = -EINVAL; |
128 | switch (p->family) { |
129 | case AF_INET: |
130 | break; |
131 | |
132 | case AF_INET6: |
133 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
134 | break; |
135 | #else |
136 | err = -EAFNOSUPPORT; |
137 | goto out; |
138 | #endif |
139 | |
140 | default: |
141 | goto out; |
142 | } |
143 | |
144 | err = -EINVAL; |
145 | switch (p->id.proto) { |
146 | case IPPROTO_AH: |
147 | if ((!attrs[XFRMA_ALG_AUTH] && |
148 | !attrs[XFRMA_ALG_AUTH_TRUNC]) || |
149 | attrs[XFRMA_ALG_AEAD] || |
150 | attrs[XFRMA_ALG_CRYPT] || |
151 | attrs[XFRMA_ALG_COMP]) |
152 | goto out; |
153 | break; |
154 | |
155 | case IPPROTO_ESP: |
156 | if (attrs[XFRMA_ALG_COMP]) |
157 | goto out; |
158 | if (!attrs[XFRMA_ALG_AUTH] && |
159 | !attrs[XFRMA_ALG_AUTH_TRUNC] && |
160 | !attrs[XFRMA_ALG_CRYPT] && |
161 | !attrs[XFRMA_ALG_AEAD]) |
162 | goto out; |
163 | if ((attrs[XFRMA_ALG_AUTH] || |
164 | attrs[XFRMA_ALG_AUTH_TRUNC] || |
165 | attrs[XFRMA_ALG_CRYPT]) && |
166 | attrs[XFRMA_ALG_AEAD]) |
167 | goto out; |
168 | break; |
169 | |
170 | case IPPROTO_COMP: |
171 | if (!attrs[XFRMA_ALG_COMP] || |
172 | attrs[XFRMA_ALG_AEAD] || |
173 | attrs[XFRMA_ALG_AUTH] || |
174 | attrs[XFRMA_ALG_AUTH_TRUNC] || |
175 | attrs[XFRMA_ALG_CRYPT]) |
176 | goto out; |
177 | break; |
178 | |
179 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
180 | case IPPROTO_DSTOPTS: |
181 | case IPPROTO_ROUTING: |
182 | if (attrs[XFRMA_ALG_COMP] || |
183 | attrs[XFRMA_ALG_AUTH] || |
184 | attrs[XFRMA_ALG_AUTH_TRUNC] || |
185 | attrs[XFRMA_ALG_AEAD] || |
186 | attrs[XFRMA_ALG_CRYPT] || |
187 | attrs[XFRMA_ENCAP] || |
188 | attrs[XFRMA_SEC_CTX] || |
189 | !attrs[XFRMA_COADDR]) |
190 | goto out; |
191 | break; |
192 | #endif |
193 | |
194 | default: |
195 | goto out; |
196 | } |
197 | |
198 | if ((err = verify_aead(attrs))) |
199 | goto out; |
200 | if ((err = verify_auth_trunc(attrs))) |
201 | goto out; |
202 | if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH))) |
203 | goto out; |
204 | if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT))) |
205 | goto out; |
206 | if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP))) |
207 | goto out; |
208 | if ((err = verify_sec_ctx_len(attrs))) |
209 | goto out; |
210 | |
211 | err = -EINVAL; |
212 | switch (p->mode) { |
213 | case XFRM_MODE_TRANSPORT: |
214 | case XFRM_MODE_TUNNEL: |
215 | case XFRM_MODE_ROUTEOPTIMIZATION: |
216 | case XFRM_MODE_BEET: |
217 | break; |
218 | |
219 | default: |
220 | goto out; |
221 | } |
222 | |
223 | err = 0; |
224 | |
225 | out: |
226 | return err; |
227 | } |
228 | |
229 | static int attach_one_algo(struct xfrm_algo **algpp, u8 *props, |
230 | struct xfrm_algo_desc *(*get_byname)(char *, int), |
231 | struct nlattr *rta) |
232 | { |
233 | struct xfrm_algo *p, *ualg; |
234 | struct xfrm_algo_desc *algo; |
235 | |
236 | if (!rta) |
237 | return 0; |
238 | |
239 | ualg = nla_data(rta); |
240 | |
241 | algo = get_byname(ualg->alg_name, 1); |
242 | if (!algo) |
243 | return -ENOSYS; |
244 | *props = algo->desc.sadb_alg_id; |
245 | |
246 | p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL); |
247 | if (!p) |
248 | return -ENOMEM; |
249 | |
250 | strcpy(p->alg_name, algo->name); |
251 | *algpp = p; |
252 | return 0; |
253 | } |
254 | |
255 | static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props, |
256 | struct nlattr *rta) |
257 | { |
258 | struct xfrm_algo *ualg; |
259 | struct xfrm_algo_auth *p; |
260 | struct xfrm_algo_desc *algo; |
261 | |
262 | if (!rta) |
263 | return 0; |
264 | |
265 | ualg = nla_data(rta); |
266 | |
267 | algo = xfrm_aalg_get_byname(ualg->alg_name, 1); |
268 | if (!algo) |
269 | return -ENOSYS; |
270 | *props = algo->desc.sadb_alg_id; |
271 | |
272 | p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL); |
273 | if (!p) |
274 | return -ENOMEM; |
275 | |
276 | strcpy(p->alg_name, algo->name); |
277 | p->alg_key_len = ualg->alg_key_len; |
278 | p->alg_trunc_len = algo->uinfo.auth.icv_truncbits; |
279 | memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8); |
280 | |
281 | *algpp = p; |
282 | return 0; |
283 | } |
284 | |
285 | static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props, |
286 | struct nlattr *rta) |
287 | { |
288 | struct xfrm_algo_auth *p, *ualg; |
289 | struct xfrm_algo_desc *algo; |
290 | |
291 | if (!rta) |
292 | return 0; |
293 | |
294 | ualg = nla_data(rta); |
295 | |
296 | algo = xfrm_aalg_get_byname(ualg->alg_name, 1); |
297 | if (!algo) |
298 | return -ENOSYS; |
299 | if (ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits) |
300 | return -EINVAL; |
301 | *props = algo->desc.sadb_alg_id; |
302 | |
303 | p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL); |
304 | if (!p) |
305 | return -ENOMEM; |
306 | |
307 | strcpy(p->alg_name, algo->name); |
308 | if (!p->alg_trunc_len) |
309 | p->alg_trunc_len = algo->uinfo.auth.icv_truncbits; |
310 | |
311 | *algpp = p; |
312 | return 0; |
313 | } |
314 | |
315 | static int attach_aead(struct xfrm_algo_aead **algpp, u8 *props, |
316 | struct nlattr *rta) |
317 | { |
318 | struct xfrm_algo_aead *p, *ualg; |
319 | struct xfrm_algo_desc *algo; |
320 | |
321 | if (!rta) |
322 | return 0; |
323 | |
324 | ualg = nla_data(rta); |
325 | |
326 | algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1); |
327 | if (!algo) |
328 | return -ENOSYS; |
329 | *props = algo->desc.sadb_alg_id; |
330 | |
331 | p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL); |
332 | if (!p) |
333 | return -ENOMEM; |
334 | |
335 | strcpy(p->alg_name, algo->name); |
336 | *algpp = p; |
337 | return 0; |
338 | } |
339 | |
340 | static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx) |
341 | { |
342 | int len = 0; |
343 | |
344 | if (xfrm_ctx) { |
345 | len += sizeof(struct xfrm_user_sec_ctx); |
346 | len += xfrm_ctx->ctx_len; |
347 | } |
348 | return len; |
349 | } |
350 | |
351 | static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p) |
352 | { |
353 | memcpy(&x->id, &p->id, sizeof(x->id)); |
354 | memcpy(&x->sel, &p->sel, sizeof(x->sel)); |
355 | memcpy(&x->lft, &p->lft, sizeof(x->lft)); |
356 | x->props.mode = p->mode; |
357 | x->props.replay_window = p->replay_window; |
358 | x->props.reqid = p->reqid; |
359 | x->props.family = p->family; |
360 | memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr)); |
361 | x->props.flags = p->flags; |
362 | |
363 | if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC)) |
364 | x->sel.family = p->family; |
365 | } |
366 | |
367 | /* |
368 | * someday when pfkey also has support, we could have the code |
369 | * somehow made shareable and move it to xfrm_state.c - JHS |
370 | * |
371 | */ |
372 | static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs) |
373 | { |
374 | struct nlattr *rp = attrs[XFRMA_REPLAY_VAL]; |
375 | struct nlattr *lt = attrs[XFRMA_LTIME_VAL]; |
376 | struct nlattr *et = attrs[XFRMA_ETIMER_THRESH]; |
377 | struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH]; |
378 | |
379 | if (rp) { |
380 | struct xfrm_replay_state *replay; |
381 | replay = nla_data(rp); |
382 | memcpy(&x->replay, replay, sizeof(*replay)); |
383 | memcpy(&x->preplay, replay, sizeof(*replay)); |
384 | } |
385 | |
386 | if (lt) { |
387 | struct xfrm_lifetime_cur *ltime; |
388 | ltime = nla_data(lt); |
389 | x->curlft.bytes = ltime->bytes; |
390 | x->curlft.packets = ltime->packets; |
391 | x->curlft.add_time = ltime->add_time; |
392 | x->curlft.use_time = ltime->use_time; |
393 | } |
394 | |
395 | if (et) |
396 | x->replay_maxage = nla_get_u32(et); |
397 | |
398 | if (rt) |
399 | x->replay_maxdiff = nla_get_u32(rt); |
400 | } |
401 | |
402 | static struct xfrm_state *xfrm_state_construct(struct net *net, |
403 | struct xfrm_usersa_info *p, |
404 | struct nlattr **attrs, |
405 | int *errp) |
406 | { |
407 | struct xfrm_state *x = xfrm_state_alloc(net); |
408 | int err = -ENOMEM; |
409 | |
410 | if (!x) |
411 | goto error_no_put; |
412 | |
413 | copy_from_user_state(x, p); |
414 | |
415 | if ((err = attach_aead(&x->aead, &x->props.ealgo, |
416 | attrs[XFRMA_ALG_AEAD]))) |
417 | goto error; |
418 | if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo, |
419 | attrs[XFRMA_ALG_AUTH_TRUNC]))) |
420 | goto error; |
421 | if (!x->props.aalgo) { |
422 | if ((err = attach_auth(&x->aalg, &x->props.aalgo, |
423 | attrs[XFRMA_ALG_AUTH]))) |
424 | goto error; |
425 | } |
426 | if ((err = attach_one_algo(&x->ealg, &x->props.ealgo, |
427 | xfrm_ealg_get_byname, |
428 | attrs[XFRMA_ALG_CRYPT]))) |
429 | goto error; |
430 | if ((err = attach_one_algo(&x->calg, &x->props.calgo, |
431 | xfrm_calg_get_byname, |
432 | attrs[XFRMA_ALG_COMP]))) |
433 | goto error; |
434 | |
435 | if (attrs[XFRMA_ENCAP]) { |
436 | x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]), |
437 | sizeof(*x->encap), GFP_KERNEL); |
438 | if (x->encap == NULL) |
439 | goto error; |
440 | } |
441 | |
442 | if (attrs[XFRMA_COADDR]) { |
443 | x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]), |
444 | sizeof(*x->coaddr), GFP_KERNEL); |
445 | if (x->coaddr == NULL) |
446 | goto error; |
447 | } |
448 | |
449 | xfrm_mark_get(attrs, &x->mark); |
450 | |
451 | err = xfrm_init_state(x); |
452 | if (err) |
453 | goto error; |
454 | |
455 | if (attrs[XFRMA_SEC_CTX] && |
456 | security_xfrm_state_alloc(x, nla_data(attrs[XFRMA_SEC_CTX]))) |
457 | goto error; |
458 | |
459 | x->km.seq = p->seq; |
460 | x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth; |
461 | /* sysctl_xfrm_aevent_etime is in 100ms units */ |
462 | x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M; |
463 | x->preplay.bitmap = 0; |
464 | x->preplay.seq = x->replay.seq+x->replay_maxdiff; |
465 | x->preplay.oseq = x->replay.oseq +x->replay_maxdiff; |
466 | |
467 | /* override default values from above */ |
468 | |
469 | xfrm_update_ae_params(x, attrs); |
470 | |
471 | return x; |
472 | |
473 | error: |
474 | x->km.state = XFRM_STATE_DEAD; |
475 | xfrm_state_put(x); |
476 | error_no_put: |
477 | *errp = err; |
478 | return NULL; |
479 | } |
480 | |
481 | static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh, |
482 | struct nlattr **attrs) |
483 | { |
484 | struct net *net = sock_net(skb->sk); |
485 | struct xfrm_usersa_info *p = nlmsg_data(nlh); |
486 | struct xfrm_state *x; |
487 | int err; |
488 | struct km_event c; |
489 | uid_t loginuid = NETLINK_CB(skb).loginuid; |
490 | u32 sessionid = NETLINK_CB(skb).sessionid; |
491 | u32 sid = NETLINK_CB(skb).sid; |
492 | |
493 | err = verify_newsa_info(p, attrs); |
494 | if (err) |
495 | return err; |
496 | |
497 | x = xfrm_state_construct(net, p, attrs, &err); |
498 | if (!x) |
499 | return err; |
500 | |
501 | xfrm_state_hold(x); |
502 | if (nlh->nlmsg_type == XFRM_MSG_NEWSA) |
503 | err = xfrm_state_add(x); |
504 | else |
505 | err = xfrm_state_update(x); |
506 | |
507 | xfrm_audit_state_add(x, err ? 0 : 1, loginuid, sessionid, sid); |
508 | |
509 | if (err < 0) { |
510 | x->km.state = XFRM_STATE_DEAD; |
511 | __xfrm_state_put(x); |
512 | goto out; |
513 | } |
514 | |
515 | c.seq = nlh->nlmsg_seq; |
516 | c.pid = nlh->nlmsg_pid; |
517 | c.event = nlh->nlmsg_type; |
518 | |
519 | km_state_notify(x, &c); |
520 | out: |
521 | xfrm_state_put(x); |
522 | return err; |
523 | } |
524 | |
525 | static struct xfrm_state *xfrm_user_state_lookup(struct net *net, |
526 | struct xfrm_usersa_id *p, |
527 | struct nlattr **attrs, |
528 | int *errp) |
529 | { |
530 | struct xfrm_state *x = NULL; |
531 | struct xfrm_mark m; |
532 | int err; |
533 | u32 mark = xfrm_mark_get(attrs, &m); |
534 | |
535 | if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) { |
536 | err = -ESRCH; |
537 | x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family); |
538 | } else { |
539 | xfrm_address_t *saddr = NULL; |
540 | |
541 | verify_one_addr(attrs, XFRMA_SRCADDR, &saddr); |
542 | if (!saddr) { |
543 | err = -EINVAL; |
544 | goto out; |
545 | } |
546 | |
547 | err = -ESRCH; |
548 | x = xfrm_state_lookup_byaddr(net, mark, |
549 | &p->daddr, saddr, |
550 | p->proto, p->family); |
551 | } |
552 | |
553 | out: |
554 | if (!x && errp) |
555 | *errp = err; |
556 | return x; |
557 | } |
558 | |
559 | static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh, |
560 | struct nlattr **attrs) |
561 | { |
562 | struct net *net = sock_net(skb->sk); |
563 | struct xfrm_state *x; |
564 | int err = -ESRCH; |
565 | struct km_event c; |
566 | struct xfrm_usersa_id *p = nlmsg_data(nlh); |
567 | uid_t loginuid = NETLINK_CB(skb).loginuid; |
568 | u32 sessionid = NETLINK_CB(skb).sessionid; |
569 | u32 sid = NETLINK_CB(skb).sid; |
570 | |
571 | x = xfrm_user_state_lookup(net, p, attrs, &err); |
572 | if (x == NULL) |
573 | return err; |
574 | |
575 | if ((err = security_xfrm_state_delete(x)) != 0) |
576 | goto out; |
577 | |
578 | if (xfrm_state_kern(x)) { |
579 | err = -EPERM; |
580 | goto out; |
581 | } |
582 | |
583 | err = xfrm_state_delete(x); |
584 | |
585 | if (err < 0) |
586 | goto out; |
587 | |
588 | c.seq = nlh->nlmsg_seq; |
589 | c.pid = nlh->nlmsg_pid; |
590 | c.event = nlh->nlmsg_type; |
591 | km_state_notify(x, &c); |
592 | |
593 | out: |
594 | xfrm_audit_state_delete(x, err ? 0 : 1, loginuid, sessionid, sid); |
595 | xfrm_state_put(x); |
596 | return err; |
597 | } |
598 | |
599 | static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p) |
600 | { |
601 | memcpy(&p->id, &x->id, sizeof(p->id)); |
602 | memcpy(&p->sel, &x->sel, sizeof(p->sel)); |
603 | memcpy(&p->lft, &x->lft, sizeof(p->lft)); |
604 | memcpy(&p->curlft, &x->curlft, sizeof(p->curlft)); |
605 | memcpy(&p->stats, &x->stats, sizeof(p->stats)); |
606 | memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr)); |
607 | p->mode = x->props.mode; |
608 | p->replay_window = x->props.replay_window; |
609 | p->reqid = x->props.reqid; |
610 | p->family = x->props.family; |
611 | p->flags = x->props.flags; |
612 | p->seq = x->km.seq; |
613 | } |
614 | |
615 | struct xfrm_dump_info { |
616 | struct sk_buff *in_skb; |
617 | struct sk_buff *out_skb; |
618 | u32 nlmsg_seq; |
619 | u16 nlmsg_flags; |
620 | }; |
621 | |
622 | static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb) |
623 | { |
624 | struct xfrm_user_sec_ctx *uctx; |
625 | struct nlattr *attr; |
626 | int ctx_size = sizeof(*uctx) + s->ctx_len; |
627 | |
628 | attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size); |
629 | if (attr == NULL) |
630 | return -EMSGSIZE; |
631 | |
632 | uctx = nla_data(attr); |
633 | uctx->exttype = XFRMA_SEC_CTX; |
634 | uctx->len = ctx_size; |
635 | uctx->ctx_doi = s->ctx_doi; |
636 | uctx->ctx_alg = s->ctx_alg; |
637 | uctx->ctx_len = s->ctx_len; |
638 | memcpy(uctx + 1, s->ctx_str, s->ctx_len); |
639 | |
640 | return 0; |
641 | } |
642 | |
643 | static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb) |
644 | { |
645 | struct xfrm_algo *algo; |
646 | struct nlattr *nla; |
647 | |
648 | nla = nla_reserve(skb, XFRMA_ALG_AUTH, |
649 | sizeof(*algo) + (auth->alg_key_len + 7) / 8); |
650 | if (!nla) |
651 | return -EMSGSIZE; |
652 | |
653 | algo = nla_data(nla); |
654 | strcpy(algo->alg_name, auth->alg_name); |
655 | memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8); |
656 | algo->alg_key_len = auth->alg_key_len; |
657 | |
658 | return 0; |
659 | } |
660 | |
661 | /* Don't change this without updating xfrm_sa_len! */ |
662 | static int copy_to_user_state_extra(struct xfrm_state *x, |
663 | struct xfrm_usersa_info *p, |
664 | struct sk_buff *skb) |
665 | { |
666 | copy_to_user_state(x, p); |
667 | |
668 | if (x->coaddr) |
669 | NLA_PUT(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr); |
670 | |
671 | if (x->lastused) |
672 | NLA_PUT_U64(skb, XFRMA_LASTUSED, x->lastused); |
673 | |
674 | if (x->aead) |
675 | NLA_PUT(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead); |
676 | if (x->aalg) { |
677 | if (copy_to_user_auth(x->aalg, skb)) |
678 | goto nla_put_failure; |
679 | |
680 | NLA_PUT(skb, XFRMA_ALG_AUTH_TRUNC, |
681 | xfrm_alg_auth_len(x->aalg), x->aalg); |
682 | } |
683 | if (x->ealg) |
684 | NLA_PUT(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg); |
685 | if (x->calg) |
686 | NLA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg); |
687 | |
688 | if (x->encap) |
689 | NLA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap); |
690 | |
691 | if (xfrm_mark_put(skb, &x->mark)) |
692 | goto nla_put_failure; |
693 | |
694 | if (x->security && copy_sec_ctx(x->security, skb) < 0) |
695 | goto nla_put_failure; |
696 | |
697 | return 0; |
698 | |
699 | nla_put_failure: |
700 | return -EMSGSIZE; |
701 | } |
702 | |
703 | static int dump_one_state(struct xfrm_state *x, int count, void *ptr) |
704 | { |
705 | struct xfrm_dump_info *sp = ptr; |
706 | struct sk_buff *in_skb = sp->in_skb; |
707 | struct sk_buff *skb = sp->out_skb; |
708 | struct xfrm_usersa_info *p; |
709 | struct nlmsghdr *nlh; |
710 | int err; |
711 | |
712 | nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq, |
713 | XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags); |
714 | if (nlh == NULL) |
715 | return -EMSGSIZE; |
716 | |
717 | p = nlmsg_data(nlh); |
718 | |
719 | err = copy_to_user_state_extra(x, p, skb); |
720 | if (err) |
721 | goto nla_put_failure; |
722 | |
723 | nlmsg_end(skb, nlh); |
724 | return 0; |
725 | |
726 | nla_put_failure: |
727 | nlmsg_cancel(skb, nlh); |
728 | return err; |
729 | } |
730 | |
731 | static int xfrm_dump_sa_done(struct netlink_callback *cb) |
732 | { |
733 | struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1]; |
734 | xfrm_state_walk_done(walk); |
735 | return 0; |
736 | } |
737 | |
738 | static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb) |
739 | { |
740 | struct net *net = sock_net(skb->sk); |
741 | struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1]; |
742 | struct xfrm_dump_info info; |
743 | |
744 | BUILD_BUG_ON(sizeof(struct xfrm_state_walk) > |
745 | sizeof(cb->args) - sizeof(cb->args[0])); |
746 | |
747 | info.in_skb = cb->skb; |
748 | info.out_skb = skb; |
749 | info.nlmsg_seq = cb->nlh->nlmsg_seq; |
750 | info.nlmsg_flags = NLM_F_MULTI; |
751 | |
752 | if (!cb->args[0]) { |
753 | cb->args[0] = 1; |
754 | xfrm_state_walk_init(walk, 0); |
755 | } |
756 | |
757 | (void) xfrm_state_walk(net, walk, dump_one_state, &info); |
758 | |
759 | return skb->len; |
760 | } |
761 | |
762 | static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb, |
763 | struct xfrm_state *x, u32 seq) |
764 | { |
765 | struct xfrm_dump_info info; |
766 | struct sk_buff *skb; |
767 | |
768 | skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); |
769 | if (!skb) |
770 | return ERR_PTR(-ENOMEM); |
771 | |
772 | info.in_skb = in_skb; |
773 | info.out_skb = skb; |
774 | info.nlmsg_seq = seq; |
775 | info.nlmsg_flags = 0; |
776 | |
777 | if (dump_one_state(x, 0, &info)) { |
778 | kfree_skb(skb); |
779 | return NULL; |
780 | } |
781 | |
782 | return skb; |
783 | } |
784 | |
785 | static inline size_t xfrm_spdinfo_msgsize(void) |
786 | { |
787 | return NLMSG_ALIGN(4) |
788 | + nla_total_size(sizeof(struct xfrmu_spdinfo)) |
789 | + nla_total_size(sizeof(struct xfrmu_spdhinfo)); |
790 | } |
791 | |
792 | static int build_spdinfo(struct sk_buff *skb, struct net *net, |
793 | u32 pid, u32 seq, u32 flags) |
794 | { |
795 | struct xfrmk_spdinfo si; |
796 | struct xfrmu_spdinfo spc; |
797 | struct xfrmu_spdhinfo sph; |
798 | struct nlmsghdr *nlh; |
799 | u32 *f; |
800 | |
801 | nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0); |
802 | if (nlh == NULL) /* shouldnt really happen ... */ |
803 | return -EMSGSIZE; |
804 | |
805 | f = nlmsg_data(nlh); |
806 | *f = flags; |
807 | xfrm_spd_getinfo(net, &si); |
808 | spc.incnt = si.incnt; |
809 | spc.outcnt = si.outcnt; |
810 | spc.fwdcnt = si.fwdcnt; |
811 | spc.inscnt = si.inscnt; |
812 | spc.outscnt = si.outscnt; |
813 | spc.fwdscnt = si.fwdscnt; |
814 | sph.spdhcnt = si.spdhcnt; |
815 | sph.spdhmcnt = si.spdhmcnt; |
816 | |
817 | NLA_PUT(skb, XFRMA_SPD_INFO, sizeof(spc), &spc); |
818 | NLA_PUT(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph); |
819 | |
820 | return nlmsg_end(skb, nlh); |
821 | |
822 | nla_put_failure: |
823 | nlmsg_cancel(skb, nlh); |
824 | return -EMSGSIZE; |
825 | } |
826 | |
827 | static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh, |
828 | struct nlattr **attrs) |
829 | { |
830 | struct net *net = sock_net(skb->sk); |
831 | struct sk_buff *r_skb; |
832 | u32 *flags = nlmsg_data(nlh); |
833 | u32 spid = NETLINK_CB(skb).pid; |
834 | u32 seq = nlh->nlmsg_seq; |
835 | |
836 | r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC); |
837 | if (r_skb == NULL) |
838 | return -ENOMEM; |
839 | |
840 | if (build_spdinfo(r_skb, net, spid, seq, *flags) < 0) |
841 | BUG(); |
842 | |
843 | return nlmsg_unicast(net->xfrm.nlsk, r_skb, spid); |
844 | } |
845 | |
846 | static inline size_t xfrm_sadinfo_msgsize(void) |
847 | { |
848 | return NLMSG_ALIGN(4) |
849 | + nla_total_size(sizeof(struct xfrmu_sadhinfo)) |
850 | + nla_total_size(4); /* XFRMA_SAD_CNT */ |
851 | } |
852 | |
853 | static int build_sadinfo(struct sk_buff *skb, struct net *net, |
854 | u32 pid, u32 seq, u32 flags) |
855 | { |
856 | struct xfrmk_sadinfo si; |
857 | struct xfrmu_sadhinfo sh; |
858 | struct nlmsghdr *nlh; |
859 | u32 *f; |
860 | |
861 | nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0); |
862 | if (nlh == NULL) /* shouldnt really happen ... */ |
863 | return -EMSGSIZE; |
864 | |
865 | f = nlmsg_data(nlh); |
866 | *f = flags; |
867 | xfrm_sad_getinfo(net, &si); |
868 | |
869 | sh.sadhmcnt = si.sadhmcnt; |
870 | sh.sadhcnt = si.sadhcnt; |
871 | |
872 | NLA_PUT_U32(skb, XFRMA_SAD_CNT, si.sadcnt); |
873 | NLA_PUT(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh); |
874 | |
875 | return nlmsg_end(skb, nlh); |
876 | |
877 | nla_put_failure: |
878 | nlmsg_cancel(skb, nlh); |
879 | return -EMSGSIZE; |
880 | } |
881 | |
882 | static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh, |
883 | struct nlattr **attrs) |
884 | { |
885 | struct net *net = sock_net(skb->sk); |
886 | struct sk_buff *r_skb; |
887 | u32 *flags = nlmsg_data(nlh); |
888 | u32 spid = NETLINK_CB(skb).pid; |
889 | u32 seq = nlh->nlmsg_seq; |
890 | |
891 | r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC); |
892 | if (r_skb == NULL) |
893 | return -ENOMEM; |
894 | |
895 | if (build_sadinfo(r_skb, net, spid, seq, *flags) < 0) |
896 | BUG(); |
897 | |
898 | return nlmsg_unicast(net->xfrm.nlsk, r_skb, spid); |
899 | } |
900 | |
901 | static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh, |
902 | struct nlattr **attrs) |
903 | { |
904 | struct net *net = sock_net(skb->sk); |
905 | struct xfrm_usersa_id *p = nlmsg_data(nlh); |
906 | struct xfrm_state *x; |
907 | struct sk_buff *resp_skb; |
908 | int err = -ESRCH; |
909 | |
910 | x = xfrm_user_state_lookup(net, p, attrs, &err); |
911 | if (x == NULL) |
912 | goto out_noput; |
913 | |
914 | resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); |
915 | if (IS_ERR(resp_skb)) { |
916 | err = PTR_ERR(resp_skb); |
917 | } else { |
918 | err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).pid); |
919 | } |
920 | xfrm_state_put(x); |
921 | out_noput: |
922 | return err; |
923 | } |
924 | |
925 | static int verify_userspi_info(struct xfrm_userspi_info *p) |
926 | { |
927 | switch (p->info.id.proto) { |
928 | case IPPROTO_AH: |
929 | case IPPROTO_ESP: |
930 | break; |
931 | |
932 | case IPPROTO_COMP: |
933 | /* IPCOMP spi is 16-bits. */ |
934 | if (p->max >= 0x10000) |
935 | return -EINVAL; |
936 | break; |
937 | |
938 | default: |
939 | return -EINVAL; |
940 | } |
941 | |
942 | if (p->min > p->max) |
943 | return -EINVAL; |
944 | |
945 | return 0; |
946 | } |
947 | |
948 | static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh, |
949 | struct nlattr **attrs) |
950 | { |
951 | struct net *net = sock_net(skb->sk); |
952 | struct xfrm_state *x; |
953 | struct xfrm_userspi_info *p; |
954 | struct sk_buff *resp_skb; |
955 | xfrm_address_t *daddr; |
956 | int family; |
957 | int err; |
958 | u32 mark; |
959 | struct xfrm_mark m; |
960 | |
961 | p = nlmsg_data(nlh); |
962 | err = verify_userspi_info(p); |
963 | if (err) |
964 | goto out_noput; |
965 | |
966 | family = p->info.family; |
967 | daddr = &p->info.id.daddr; |
968 | |
969 | x = NULL; |
970 | |
971 | mark = xfrm_mark_get(attrs, &m); |
972 | if (p->info.seq) { |
973 | x = xfrm_find_acq_byseq(net, mark, p->info.seq); |
974 | if (x && xfrm_addr_cmp(&x->id.daddr, daddr, family)) { |
975 | xfrm_state_put(x); |
976 | x = NULL; |
977 | } |
978 | } |
979 | |
980 | if (!x) |
981 | x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid, |
982 | p->info.id.proto, daddr, |
983 | &p->info.saddr, 1, |
984 | family); |
985 | err = -ENOENT; |
986 | if (x == NULL) |
987 | goto out_noput; |
988 | |
989 | err = xfrm_alloc_spi(x, p->min, p->max); |
990 | if (err) |
991 | goto out; |
992 | |
993 | resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); |
994 | if (IS_ERR(resp_skb)) { |
995 | err = PTR_ERR(resp_skb); |
996 | goto out; |
997 | } |
998 | |
999 | err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).pid); |
1000 | |
1001 | out: |
1002 | xfrm_state_put(x); |
1003 | out_noput: |
1004 | return err; |
1005 | } |
1006 | |
1007 | static int verify_policy_dir(u8 dir) |
1008 | { |
1009 | switch (dir) { |
1010 | case XFRM_POLICY_IN: |
1011 | case XFRM_POLICY_OUT: |
1012 | case XFRM_POLICY_FWD: |
1013 | break; |
1014 | |
1015 | default: |
1016 | return -EINVAL; |
1017 | } |
1018 | |
1019 | return 0; |
1020 | } |
1021 | |
1022 | static int verify_policy_type(u8 type) |
1023 | { |
1024 | switch (type) { |
1025 | case XFRM_POLICY_TYPE_MAIN: |
1026 | #ifdef CONFIG_XFRM_SUB_POLICY |
1027 | case XFRM_POLICY_TYPE_SUB: |
1028 | #endif |
1029 | break; |
1030 | |
1031 | default: |
1032 | return -EINVAL; |
1033 | } |
1034 | |
1035 | return 0; |
1036 | } |
1037 | |
1038 | static int verify_newpolicy_info(struct xfrm_userpolicy_info *p) |
1039 | { |
1040 | switch (p->share) { |
1041 | case XFRM_SHARE_ANY: |
1042 | case XFRM_SHARE_SESSION: |
1043 | case XFRM_SHARE_USER: |
1044 | case XFRM_SHARE_UNIQUE: |
1045 | break; |
1046 | |
1047 | default: |
1048 | return -EINVAL; |
1049 | } |
1050 | |
1051 | switch (p->action) { |
1052 | case XFRM_POLICY_ALLOW: |
1053 | case XFRM_POLICY_BLOCK: |
1054 | break; |
1055 | |
1056 | default: |
1057 | return -EINVAL; |
1058 | } |
1059 | |
1060 | switch (p->sel.family) { |
1061 | case AF_INET: |
1062 | break; |
1063 | |
1064 | case AF_INET6: |
1065 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
1066 | break; |
1067 | #else |
1068 | return -EAFNOSUPPORT; |
1069 | #endif |
1070 | |
1071 | default: |
1072 | return -EINVAL; |
1073 | } |
1074 | |
1075 | return verify_policy_dir(p->dir); |
1076 | } |
1077 | |
1078 | static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs) |
1079 | { |
1080 | struct nlattr *rt = attrs[XFRMA_SEC_CTX]; |
1081 | struct xfrm_user_sec_ctx *uctx; |
1082 | |
1083 | if (!rt) |
1084 | return 0; |
1085 | |
1086 | uctx = nla_data(rt); |
1087 | return security_xfrm_policy_alloc(&pol->security, uctx); |
1088 | } |
1089 | |
1090 | static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut, |
1091 | int nr) |
1092 | { |
1093 | int i; |
1094 | |
1095 | xp->xfrm_nr = nr; |
1096 | for (i = 0; i < nr; i++, ut++) { |
1097 | struct xfrm_tmpl *t = &xp->xfrm_vec[i]; |
1098 | |
1099 | memcpy(&t->id, &ut->id, sizeof(struct xfrm_id)); |
1100 | memcpy(&t->saddr, &ut->saddr, |
1101 | sizeof(xfrm_address_t)); |
1102 | t->reqid = ut->reqid; |
1103 | t->mode = ut->mode; |
1104 | t->share = ut->share; |
1105 | t->optional = ut->optional; |
1106 | t->aalgos = ut->aalgos; |
1107 | t->ealgos = ut->ealgos; |
1108 | t->calgos = ut->calgos; |
1109 | /* If all masks are ~0, then we allow all algorithms. */ |
1110 | t->allalgs = !~(t->aalgos & t->ealgos & t->calgos); |
1111 | t->encap_family = ut->family; |
1112 | } |
1113 | } |
1114 | |
1115 | static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family) |
1116 | { |
1117 | int i; |
1118 | |
1119 | if (nr > XFRM_MAX_DEPTH) |
1120 | return -EINVAL; |
1121 | |
1122 | for (i = 0; i < nr; i++) { |
1123 | /* We never validated the ut->family value, so many |
1124 | * applications simply leave it at zero. The check was |
1125 | * never made and ut->family was ignored because all |
1126 | * templates could be assumed to have the same family as |
1127 | * the policy itself. Now that we will have ipv4-in-ipv6 |
1128 | * and ipv6-in-ipv4 tunnels, this is no longer true. |
1129 | */ |
1130 | if (!ut[i].family) |
1131 | ut[i].family = family; |
1132 | |
1133 | switch (ut[i].family) { |
1134 | case AF_INET: |
1135 | break; |
1136 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
1137 | case AF_INET6: |
1138 | break; |
1139 | #endif |
1140 | default: |
1141 | return -EINVAL; |
1142 | } |
1143 | } |
1144 | |
1145 | return 0; |
1146 | } |
1147 | |
1148 | static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs) |
1149 | { |
1150 | struct nlattr *rt = attrs[XFRMA_TMPL]; |
1151 | |
1152 | if (!rt) { |
1153 | pol->xfrm_nr = 0; |
1154 | } else { |
1155 | struct xfrm_user_tmpl *utmpl = nla_data(rt); |
1156 | int nr = nla_len(rt) / sizeof(*utmpl); |
1157 | int err; |
1158 | |
1159 | err = validate_tmpl(nr, utmpl, pol->family); |
1160 | if (err) |
1161 | return err; |
1162 | |
1163 | copy_templates(pol, utmpl, nr); |
1164 | } |
1165 | return 0; |
1166 | } |
1167 | |
1168 | static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs) |
1169 | { |
1170 | struct nlattr *rt = attrs[XFRMA_POLICY_TYPE]; |
1171 | struct xfrm_userpolicy_type *upt; |
1172 | u8 type = XFRM_POLICY_TYPE_MAIN; |
1173 | int err; |
1174 | |
1175 | if (rt) { |
1176 | upt = nla_data(rt); |
1177 | type = upt->type; |
1178 | } |
1179 | |
1180 | err = verify_policy_type(type); |
1181 | if (err) |
1182 | return err; |
1183 | |
1184 | *tp = type; |
1185 | return 0; |
1186 | } |
1187 | |
1188 | static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p) |
1189 | { |
1190 | xp->priority = p->priority; |
1191 | xp->index = p->index; |
1192 | memcpy(&xp->selector, &p->sel, sizeof(xp->selector)); |
1193 | memcpy(&xp->lft, &p->lft, sizeof(xp->lft)); |
1194 | xp->action = p->action; |
1195 | xp->flags = p->flags; |
1196 | xp->family = p->sel.family; |
1197 | /* XXX xp->share = p->share; */ |
1198 | } |
1199 | |
1200 | static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir) |
1201 | { |
1202 | memcpy(&p->sel, &xp->selector, sizeof(p->sel)); |
1203 | memcpy(&p->lft, &xp->lft, sizeof(p->lft)); |
1204 | memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft)); |
1205 | p->priority = xp->priority; |
1206 | p->index = xp->index; |
1207 | p->sel.family = xp->family; |
1208 | p->dir = dir; |
1209 | p->action = xp->action; |
1210 | p->flags = xp->flags; |
1211 | p->share = XFRM_SHARE_ANY; /* XXX xp->share */ |
1212 | } |
1213 | |
1214 | static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp) |
1215 | { |
1216 | struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL); |
1217 | int err; |
1218 | |
1219 | if (!xp) { |
1220 | *errp = -ENOMEM; |
1221 | return NULL; |
1222 | } |
1223 | |
1224 | copy_from_user_policy(xp, p); |
1225 | |
1226 | err = copy_from_user_policy_type(&xp->type, attrs); |
1227 | if (err) |
1228 | goto error; |
1229 | |
1230 | if (!(err = copy_from_user_tmpl(xp, attrs))) |
1231 | err = copy_from_user_sec_ctx(xp, attrs); |
1232 | if (err) |
1233 | goto error; |
1234 | |
1235 | xfrm_mark_get(attrs, &xp->mark); |
1236 | |
1237 | return xp; |
1238 | error: |
1239 | *errp = err; |
1240 | xp->walk.dead = 1; |
1241 | xfrm_policy_destroy(xp); |
1242 | return NULL; |
1243 | } |
1244 | |
1245 | static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh, |
1246 | struct nlattr **attrs) |
1247 | { |
1248 | struct net *net = sock_net(skb->sk); |
1249 | struct xfrm_userpolicy_info *p = nlmsg_data(nlh); |
1250 | struct xfrm_policy *xp; |
1251 | struct km_event c; |
1252 | int err; |
1253 | int excl; |
1254 | uid_t loginuid = NETLINK_CB(skb).loginuid; |
1255 | u32 sessionid = NETLINK_CB(skb).sessionid; |
1256 | u32 sid = NETLINK_CB(skb).sid; |
1257 | |
1258 | err = verify_newpolicy_info(p); |
1259 | if (err) |
1260 | return err; |
1261 | err = verify_sec_ctx_len(attrs); |
1262 | if (err) |
1263 | return err; |
1264 | |
1265 | xp = xfrm_policy_construct(net, p, attrs, &err); |
1266 | if (!xp) |
1267 | return err; |
1268 | |
1269 | /* shouldnt excl be based on nlh flags?? |
1270 | * Aha! this is anti-netlink really i.e more pfkey derived |
1271 | * in netlink excl is a flag and you wouldnt need |
1272 | * a type XFRM_MSG_UPDPOLICY - JHS */ |
1273 | excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY; |
1274 | err = xfrm_policy_insert(p->dir, xp, excl); |
1275 | xfrm_audit_policy_add(xp, err ? 0 : 1, loginuid, sessionid, sid); |
1276 | |
1277 | if (err) { |
1278 | security_xfrm_policy_free(xp->security); |
1279 | kfree(xp); |
1280 | return err; |
1281 | } |
1282 | |
1283 | c.event = nlh->nlmsg_type; |
1284 | c.seq = nlh->nlmsg_seq; |
1285 | c.pid = nlh->nlmsg_pid; |
1286 | km_policy_notify(xp, p->dir, &c); |
1287 | |
1288 | xfrm_pol_put(xp); |
1289 | |
1290 | return 0; |
1291 | } |
1292 | |
1293 | static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb) |
1294 | { |
1295 | struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH]; |
1296 | int i; |
1297 | |
1298 | if (xp->xfrm_nr == 0) |
1299 | return 0; |
1300 | |
1301 | for (i = 0; i < xp->xfrm_nr; i++) { |
1302 | struct xfrm_user_tmpl *up = &vec[i]; |
1303 | struct xfrm_tmpl *kp = &xp->xfrm_vec[i]; |
1304 | |
1305 | memcpy(&up->id, &kp->id, sizeof(up->id)); |
1306 | up->family = kp->encap_family; |
1307 | memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr)); |
1308 | up->reqid = kp->reqid; |
1309 | up->mode = kp->mode; |
1310 | up->share = kp->share; |
1311 | up->optional = kp->optional; |
1312 | up->aalgos = kp->aalgos; |
1313 | up->ealgos = kp->ealgos; |
1314 | up->calgos = kp->calgos; |
1315 | } |
1316 | |
1317 | return nla_put(skb, XFRMA_TMPL, |
1318 | sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec); |
1319 | } |
1320 | |
1321 | static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb) |
1322 | { |
1323 | if (x->security) { |
1324 | return copy_sec_ctx(x->security, skb); |
1325 | } |
1326 | return 0; |
1327 | } |
1328 | |
1329 | static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb) |
1330 | { |
1331 | if (xp->security) { |
1332 | return copy_sec_ctx(xp->security, skb); |
1333 | } |
1334 | return 0; |
1335 | } |
1336 | static inline size_t userpolicy_type_attrsize(void) |
1337 | { |
1338 | #ifdef CONFIG_XFRM_SUB_POLICY |
1339 | return nla_total_size(sizeof(struct xfrm_userpolicy_type)); |
1340 | #else |
1341 | return 0; |
1342 | #endif |
1343 | } |
1344 | |
1345 | #ifdef CONFIG_XFRM_SUB_POLICY |
1346 | static int copy_to_user_policy_type(u8 type, struct sk_buff *skb) |
1347 | { |
1348 | struct xfrm_userpolicy_type upt = { |
1349 | .type = type, |
1350 | }; |
1351 | |
1352 | return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt); |
1353 | } |
1354 | |
1355 | #else |
1356 | static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb) |
1357 | { |
1358 | return 0; |
1359 | } |
1360 | #endif |
1361 | |
1362 | static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr) |
1363 | { |
1364 | struct xfrm_dump_info *sp = ptr; |
1365 | struct xfrm_userpolicy_info *p; |
1366 | struct sk_buff *in_skb = sp->in_skb; |
1367 | struct sk_buff *skb = sp->out_skb; |
1368 | struct nlmsghdr *nlh; |
1369 | |
1370 | nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq, |
1371 | XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags); |
1372 | if (nlh == NULL) |
1373 | return -EMSGSIZE; |
1374 | |
1375 | p = nlmsg_data(nlh); |
1376 | copy_to_user_policy(xp, p, dir); |
1377 | if (copy_to_user_tmpl(xp, skb) < 0) |
1378 | goto nlmsg_failure; |
1379 | if (copy_to_user_sec_ctx(xp, skb)) |
1380 | goto nlmsg_failure; |
1381 | if (copy_to_user_policy_type(xp->type, skb) < 0) |
1382 | goto nlmsg_failure; |
1383 | if (xfrm_mark_put(skb, &xp->mark)) |
1384 | goto nla_put_failure; |
1385 | |
1386 | nlmsg_end(skb, nlh); |
1387 | return 0; |
1388 | |
1389 | nla_put_failure: |
1390 | nlmsg_failure: |
1391 | nlmsg_cancel(skb, nlh); |
1392 | return -EMSGSIZE; |
1393 | } |
1394 | |
1395 | static int xfrm_dump_policy_done(struct netlink_callback *cb) |
1396 | { |
1397 | struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1]; |
1398 | |
1399 | xfrm_policy_walk_done(walk); |
1400 | return 0; |
1401 | } |
1402 | |
1403 | static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb) |
1404 | { |
1405 | struct net *net = sock_net(skb->sk); |
1406 | struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1]; |
1407 | struct xfrm_dump_info info; |
1408 | |
1409 | BUILD_BUG_ON(sizeof(struct xfrm_policy_walk) > |
1410 | sizeof(cb->args) - sizeof(cb->args[0])); |
1411 | |
1412 | info.in_skb = cb->skb; |
1413 | info.out_skb = skb; |
1414 | info.nlmsg_seq = cb->nlh->nlmsg_seq; |
1415 | info.nlmsg_flags = NLM_F_MULTI; |
1416 | |
1417 | if (!cb->args[0]) { |
1418 | cb->args[0] = 1; |
1419 | xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY); |
1420 | } |
1421 | |
1422 | (void) xfrm_policy_walk(net, walk, dump_one_policy, &info); |
1423 | |
1424 | return skb->len; |
1425 | } |
1426 | |
1427 | static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb, |
1428 | struct xfrm_policy *xp, |
1429 | int dir, u32 seq) |
1430 | { |
1431 | struct xfrm_dump_info info; |
1432 | struct sk_buff *skb; |
1433 | |
1434 | skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
1435 | if (!skb) |
1436 | return ERR_PTR(-ENOMEM); |
1437 | |
1438 | info.in_skb = in_skb; |
1439 | info.out_skb = skb; |
1440 | info.nlmsg_seq = seq; |
1441 | info.nlmsg_flags = 0; |
1442 | |
1443 | if (dump_one_policy(xp, dir, 0, &info) < 0) { |
1444 | kfree_skb(skb); |
1445 | return NULL; |
1446 | } |
1447 | |
1448 | return skb; |
1449 | } |
1450 | |
1451 | static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh, |
1452 | struct nlattr **attrs) |
1453 | { |
1454 | struct net *net = sock_net(skb->sk); |
1455 | struct xfrm_policy *xp; |
1456 | struct xfrm_userpolicy_id *p; |
1457 | u8 type = XFRM_POLICY_TYPE_MAIN; |
1458 | int err; |
1459 | struct km_event c; |
1460 | int delete; |
1461 | struct xfrm_mark m; |
1462 | u32 mark = xfrm_mark_get(attrs, &m); |
1463 | |
1464 | p = nlmsg_data(nlh); |
1465 | delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY; |
1466 | |
1467 | err = copy_from_user_policy_type(&type, attrs); |
1468 | if (err) |
1469 | return err; |
1470 | |
1471 | err = verify_policy_dir(p->dir); |
1472 | if (err) |
1473 | return err; |
1474 | |
1475 | if (p->index) |
1476 | xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err); |
1477 | else { |
1478 | struct nlattr *rt = attrs[XFRMA_SEC_CTX]; |
1479 | struct xfrm_sec_ctx *ctx; |
1480 | |
1481 | err = verify_sec_ctx_len(attrs); |
1482 | if (err) |
1483 | return err; |
1484 | |
1485 | ctx = NULL; |
1486 | if (rt) { |
1487 | struct xfrm_user_sec_ctx *uctx = nla_data(rt); |
1488 | |
1489 | err = security_xfrm_policy_alloc(&ctx, uctx); |
1490 | if (err) |
1491 | return err; |
1492 | } |
1493 | xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel, |
1494 | ctx, delete, &err); |
1495 | security_xfrm_policy_free(ctx); |
1496 | } |
1497 | if (xp == NULL) |
1498 | return -ENOENT; |
1499 | |
1500 | if (!delete) { |
1501 | struct sk_buff *resp_skb; |
1502 | |
1503 | resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq); |
1504 | if (IS_ERR(resp_skb)) { |
1505 | err = PTR_ERR(resp_skb); |
1506 | } else { |
1507 | err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, |
1508 | NETLINK_CB(skb).pid); |
1509 | } |
1510 | } else { |
1511 | uid_t loginuid = NETLINK_CB(skb).loginuid; |
1512 | u32 sessionid = NETLINK_CB(skb).sessionid; |
1513 | u32 sid = NETLINK_CB(skb).sid; |
1514 | |
1515 | xfrm_audit_policy_delete(xp, err ? 0 : 1, loginuid, sessionid, |
1516 | sid); |
1517 | |
1518 | if (err != 0) |
1519 | goto out; |
1520 | |
1521 | c.data.byid = p->index; |
1522 | c.event = nlh->nlmsg_type; |
1523 | c.seq = nlh->nlmsg_seq; |
1524 | c.pid = nlh->nlmsg_pid; |
1525 | km_policy_notify(xp, p->dir, &c); |
1526 | } |
1527 | |
1528 | out: |
1529 | xfrm_pol_put(xp); |
1530 | return err; |
1531 | } |
1532 | |
1533 | static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh, |
1534 | struct nlattr **attrs) |
1535 | { |
1536 | struct net *net = sock_net(skb->sk); |
1537 | struct km_event c; |
1538 | struct xfrm_usersa_flush *p = nlmsg_data(nlh); |
1539 | struct xfrm_audit audit_info; |
1540 | int err; |
1541 | |
1542 | audit_info.loginuid = NETLINK_CB(skb).loginuid; |
1543 | audit_info.sessionid = NETLINK_CB(skb).sessionid; |
1544 | audit_info.secid = NETLINK_CB(skb).sid; |
1545 | err = xfrm_state_flush(net, p->proto, &audit_info); |
1546 | if (err) { |
1547 | if (err == -ESRCH) /* empty table */ |
1548 | return 0; |
1549 | return err; |
1550 | } |
1551 | c.data.proto = p->proto; |
1552 | c.event = nlh->nlmsg_type; |
1553 | c.seq = nlh->nlmsg_seq; |
1554 | c.pid = nlh->nlmsg_pid; |
1555 | c.net = net; |
1556 | km_state_notify(NULL, &c); |
1557 | |
1558 | return 0; |
1559 | } |
1560 | |
1561 | static inline size_t xfrm_aevent_msgsize(void) |
1562 | { |
1563 | return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id)) |
1564 | + nla_total_size(sizeof(struct xfrm_replay_state)) |
1565 | + nla_total_size(sizeof(struct xfrm_lifetime_cur)) |
1566 | + nla_total_size(sizeof(struct xfrm_mark)) |
1567 | + nla_total_size(4) /* XFRM_AE_RTHR */ |
1568 | + nla_total_size(4); /* XFRM_AE_ETHR */ |
1569 | } |
1570 | |
1571 | static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c) |
1572 | { |
1573 | struct xfrm_aevent_id *id; |
1574 | struct nlmsghdr *nlh; |
1575 | |
1576 | nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0); |
1577 | if (nlh == NULL) |
1578 | return -EMSGSIZE; |
1579 | |
1580 | id = nlmsg_data(nlh); |
1581 | memcpy(&id->sa_id.daddr, &x->id.daddr,sizeof(x->id.daddr)); |
1582 | id->sa_id.spi = x->id.spi; |
1583 | id->sa_id.family = x->props.family; |
1584 | id->sa_id.proto = x->id.proto; |
1585 | memcpy(&id->saddr, &x->props.saddr,sizeof(x->props.saddr)); |
1586 | id->reqid = x->props.reqid; |
1587 | id->flags = c->data.aevent; |
1588 | |
1589 | NLA_PUT(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), &x->replay); |
1590 | NLA_PUT(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft); |
1591 | |
1592 | if (id->flags & XFRM_AE_RTHR) |
1593 | NLA_PUT_U32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff); |
1594 | |
1595 | if (id->flags & XFRM_AE_ETHR) |
1596 | NLA_PUT_U32(skb, XFRMA_ETIMER_THRESH, |
1597 | x->replay_maxage * 10 / HZ); |
1598 | |
1599 | if (xfrm_mark_put(skb, &x->mark)) |
1600 | goto nla_put_failure; |
1601 | |
1602 | return nlmsg_end(skb, nlh); |
1603 | |
1604 | nla_put_failure: |
1605 | nlmsg_cancel(skb, nlh); |
1606 | return -EMSGSIZE; |
1607 | } |
1608 | |
1609 | static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh, |
1610 | struct nlattr **attrs) |
1611 | { |
1612 | struct net *net = sock_net(skb->sk); |
1613 | struct xfrm_state *x; |
1614 | struct sk_buff *r_skb; |
1615 | int err; |
1616 | struct km_event c; |
1617 | u32 mark; |
1618 | struct xfrm_mark m; |
1619 | struct xfrm_aevent_id *p = nlmsg_data(nlh); |
1620 | struct xfrm_usersa_id *id = &p->sa_id; |
1621 | |
1622 | r_skb = nlmsg_new(xfrm_aevent_msgsize(), GFP_ATOMIC); |
1623 | if (r_skb == NULL) |
1624 | return -ENOMEM; |
1625 | |
1626 | mark = xfrm_mark_get(attrs, &m); |
1627 | |
1628 | x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family); |
1629 | if (x == NULL) { |
1630 | kfree_skb(r_skb); |
1631 | return -ESRCH; |
1632 | } |
1633 | |
1634 | /* |
1635 | * XXX: is this lock really needed - none of the other |
1636 | * gets lock (the concern is things getting updated |
1637 | * while we are still reading) - jhs |
1638 | */ |
1639 | spin_lock_bh(&x->lock); |
1640 | c.data.aevent = p->flags; |
1641 | c.seq = nlh->nlmsg_seq; |
1642 | c.pid = nlh->nlmsg_pid; |
1643 | |
1644 | if (build_aevent(r_skb, x, &c) < 0) |
1645 | BUG(); |
1646 | err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).pid); |
1647 | spin_unlock_bh(&x->lock); |
1648 | xfrm_state_put(x); |
1649 | return err; |
1650 | } |
1651 | |
1652 | static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh, |
1653 | struct nlattr **attrs) |
1654 | { |
1655 | struct net *net = sock_net(skb->sk); |
1656 | struct xfrm_state *x; |
1657 | struct km_event c; |
1658 | int err = - EINVAL; |
1659 | u32 mark = 0; |
1660 | struct xfrm_mark m; |
1661 | struct xfrm_aevent_id *p = nlmsg_data(nlh); |
1662 | struct nlattr *rp = attrs[XFRMA_REPLAY_VAL]; |
1663 | struct nlattr *lt = attrs[XFRMA_LTIME_VAL]; |
1664 | |
1665 | if (!lt && !rp) |
1666 | return err; |
1667 | |
1668 | /* pedantic mode - thou shalt sayeth replaceth */ |
1669 | if (!(nlh->nlmsg_flags&NLM_F_REPLACE)) |
1670 | return err; |
1671 | |
1672 | mark = xfrm_mark_get(attrs, &m); |
1673 | |
1674 | x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family); |
1675 | if (x == NULL) |
1676 | return -ESRCH; |
1677 | |
1678 | if (x->km.state != XFRM_STATE_VALID) |
1679 | goto out; |
1680 | |
1681 | spin_lock_bh(&x->lock); |
1682 | xfrm_update_ae_params(x, attrs); |
1683 | spin_unlock_bh(&x->lock); |
1684 | |
1685 | c.event = nlh->nlmsg_type; |
1686 | c.seq = nlh->nlmsg_seq; |
1687 | c.pid = nlh->nlmsg_pid; |
1688 | c.data.aevent = XFRM_AE_CU; |
1689 | km_state_notify(x, &c); |
1690 | err = 0; |
1691 | out: |
1692 | xfrm_state_put(x); |
1693 | return err; |
1694 | } |
1695 | |
1696 | static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh, |
1697 | struct nlattr **attrs) |
1698 | { |
1699 | struct net *net = sock_net(skb->sk); |
1700 | struct km_event c; |
1701 | u8 type = XFRM_POLICY_TYPE_MAIN; |
1702 | int err; |
1703 | struct xfrm_audit audit_info; |
1704 | |
1705 | err = copy_from_user_policy_type(&type, attrs); |
1706 | if (err) |
1707 | return err; |
1708 | |
1709 | audit_info.loginuid = NETLINK_CB(skb).loginuid; |
1710 | audit_info.sessionid = NETLINK_CB(skb).sessionid; |
1711 | audit_info.secid = NETLINK_CB(skb).sid; |
1712 | err = xfrm_policy_flush(net, type, &audit_info); |
1713 | if (err) { |
1714 | if (err == -ESRCH) /* empty table */ |
1715 | return 0; |
1716 | return err; |
1717 | } |
1718 | |
1719 | c.data.type = type; |
1720 | c.event = nlh->nlmsg_type; |
1721 | c.seq = nlh->nlmsg_seq; |
1722 | c.pid = nlh->nlmsg_pid; |
1723 | c.net = net; |
1724 | km_policy_notify(NULL, 0, &c); |
1725 | return 0; |
1726 | } |
1727 | |
1728 | static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh, |
1729 | struct nlattr **attrs) |
1730 | { |
1731 | struct net *net = sock_net(skb->sk); |
1732 | struct xfrm_policy *xp; |
1733 | struct xfrm_user_polexpire *up = nlmsg_data(nlh); |
1734 | struct xfrm_userpolicy_info *p = &up->pol; |
1735 | u8 type = XFRM_POLICY_TYPE_MAIN; |
1736 | int err = -ENOENT; |
1737 | struct xfrm_mark m; |
1738 | u32 mark = xfrm_mark_get(attrs, &m); |
1739 | |
1740 | err = copy_from_user_policy_type(&type, attrs); |
1741 | if (err) |
1742 | return err; |
1743 | |
1744 | if (p->index) |
1745 | xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err); |
1746 | else { |
1747 | struct nlattr *rt = attrs[XFRMA_SEC_CTX]; |
1748 | struct xfrm_sec_ctx *ctx; |
1749 | |
1750 | err = verify_sec_ctx_len(attrs); |
1751 | if (err) |
1752 | return err; |
1753 | |
1754 | ctx = NULL; |
1755 | if (rt) { |
1756 | struct xfrm_user_sec_ctx *uctx = nla_data(rt); |
1757 | |
1758 | err = security_xfrm_policy_alloc(&ctx, uctx); |
1759 | if (err) |
1760 | return err; |
1761 | } |
1762 | xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, |
1763 | &p->sel, ctx, 0, &err); |
1764 | security_xfrm_policy_free(ctx); |
1765 | } |
1766 | if (xp == NULL) |
1767 | return -ENOENT; |
1768 | |
1769 | read_lock(&xp->lock); |
1770 | if (xp->walk.dead) { |
1771 | read_unlock(&xp->lock); |
1772 | goto out; |
1773 | } |
1774 | |
1775 | read_unlock(&xp->lock); |
1776 | err = 0; |
1777 | if (up->hard) { |
1778 | uid_t loginuid = NETLINK_CB(skb).loginuid; |
1779 | uid_t sessionid = NETLINK_CB(skb).sessionid; |
1780 | u32 sid = NETLINK_CB(skb).sid; |
1781 | xfrm_policy_delete(xp, p->dir); |
1782 | xfrm_audit_policy_delete(xp, 1, loginuid, sessionid, sid); |
1783 | |
1784 | } else { |
1785 | // reset the timers here? |
1786 | printk("Dont know what to do with soft policy expire\n"); |
1787 | } |
1788 | km_policy_expired(xp, p->dir, up->hard, current->pid); |
1789 | |
1790 | out: |
1791 | xfrm_pol_put(xp); |
1792 | return err; |
1793 | } |
1794 | |
1795 | static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh, |
1796 | struct nlattr **attrs) |
1797 | { |
1798 | struct net *net = sock_net(skb->sk); |
1799 | struct xfrm_state *x; |
1800 | int err; |
1801 | struct xfrm_user_expire *ue = nlmsg_data(nlh); |
1802 | struct xfrm_usersa_info *p = &ue->state; |
1803 | struct xfrm_mark m; |
1804 | u32 mark = xfrm_mark_get(attrs, &m);; |
1805 | |
1806 | x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family); |
1807 | |
1808 | err = -ENOENT; |
1809 | if (x == NULL) |
1810 | return err; |
1811 | |
1812 | spin_lock_bh(&x->lock); |
1813 | err = -EINVAL; |
1814 | if (x->km.state != XFRM_STATE_VALID) |
1815 | goto out; |
1816 | km_state_expired(x, ue->hard, current->pid); |
1817 | |
1818 | if (ue->hard) { |
1819 | uid_t loginuid = NETLINK_CB(skb).loginuid; |
1820 | uid_t sessionid = NETLINK_CB(skb).sessionid; |
1821 | u32 sid = NETLINK_CB(skb).sid; |
1822 | __xfrm_state_delete(x); |
1823 | xfrm_audit_state_delete(x, 1, loginuid, sessionid, sid); |
1824 | } |
1825 | err = 0; |
1826 | out: |
1827 | spin_unlock_bh(&x->lock); |
1828 | xfrm_state_put(x); |
1829 | return err; |
1830 | } |
1831 | |
1832 | static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh, |
1833 | struct nlattr **attrs) |
1834 | { |
1835 | struct net *net = sock_net(skb->sk); |
1836 | struct xfrm_policy *xp; |
1837 | struct xfrm_user_tmpl *ut; |
1838 | int i; |
1839 | struct nlattr *rt = attrs[XFRMA_TMPL]; |
1840 | struct xfrm_mark mark; |
1841 | |
1842 | struct xfrm_user_acquire *ua = nlmsg_data(nlh); |
1843 | struct xfrm_state *x = xfrm_state_alloc(net); |
1844 | int err = -ENOMEM; |
1845 | |
1846 | if (!x) |
1847 | goto nomem; |
1848 | |
1849 | xfrm_mark_get(attrs, &mark); |
1850 | |
1851 | err = verify_newpolicy_info(&ua->policy); |
1852 | if (err) |
1853 | goto bad_policy; |
1854 | |
1855 | /* build an XP */ |
1856 | xp = xfrm_policy_construct(net, &ua->policy, attrs, &err); |
1857 | if (!xp) |
1858 | goto free_state; |
1859 | |
1860 | memcpy(&x->id, &ua->id, sizeof(ua->id)); |
1861 | memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr)); |
1862 | memcpy(&x->sel, &ua->sel, sizeof(ua->sel)); |
1863 | xp->mark.m = x->mark.m = mark.m; |
1864 | xp->mark.v = x->mark.v = mark.v; |
1865 | ut = nla_data(rt); |
1866 | /* extract the templates and for each call km_key */ |
1867 | for (i = 0; i < xp->xfrm_nr; i++, ut++) { |
1868 | struct xfrm_tmpl *t = &xp->xfrm_vec[i]; |
1869 | memcpy(&x->id, &t->id, sizeof(x->id)); |
1870 | x->props.mode = t->mode; |
1871 | x->props.reqid = t->reqid; |
1872 | x->props.family = ut->family; |
1873 | t->aalgos = ua->aalgos; |
1874 | t->ealgos = ua->ealgos; |
1875 | t->calgos = ua->calgos; |
1876 | err = km_query(x, t, xp); |
1877 | |
1878 | } |
1879 | |
1880 | kfree(x); |
1881 | kfree(xp); |
1882 | |
1883 | return 0; |
1884 | |
1885 | bad_policy: |
1886 | printk("BAD policy passed\n"); |
1887 | free_state: |
1888 | kfree(x); |
1889 | nomem: |
1890 | return err; |
1891 | } |
1892 | |
1893 | #ifdef CONFIG_XFRM_MIGRATE |
1894 | static int copy_from_user_migrate(struct xfrm_migrate *ma, |
1895 | struct xfrm_kmaddress *k, |
1896 | struct nlattr **attrs, int *num) |
1897 | { |
1898 | struct nlattr *rt = attrs[XFRMA_MIGRATE]; |
1899 | struct xfrm_user_migrate *um; |
1900 | int i, num_migrate; |
1901 | |
1902 | if (k != NULL) { |
1903 | struct xfrm_user_kmaddress *uk; |
1904 | |
1905 | uk = nla_data(attrs[XFRMA_KMADDRESS]); |
1906 | memcpy(&k->local, &uk->local, sizeof(k->local)); |
1907 | memcpy(&k->remote, &uk->remote, sizeof(k->remote)); |
1908 | k->family = uk->family; |
1909 | k->reserved = uk->reserved; |
1910 | } |
1911 | |
1912 | um = nla_data(rt); |
1913 | num_migrate = nla_len(rt) / sizeof(*um); |
1914 | |
1915 | if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH) |
1916 | return -EINVAL; |
1917 | |
1918 | for (i = 0; i < num_migrate; i++, um++, ma++) { |
1919 | memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr)); |
1920 | memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr)); |
1921 | memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr)); |
1922 | memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr)); |
1923 | |
1924 | ma->proto = um->proto; |
1925 | ma->mode = um->mode; |
1926 | ma->reqid = um->reqid; |
1927 | |
1928 | ma->old_family = um->old_family; |
1929 | ma->new_family = um->new_family; |
1930 | } |
1931 | |
1932 | *num = i; |
1933 | return 0; |
1934 | } |
1935 | |
1936 | static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh, |
1937 | struct nlattr **attrs) |
1938 | { |
1939 | struct xfrm_userpolicy_id *pi = nlmsg_data(nlh); |
1940 | struct xfrm_migrate m[XFRM_MAX_DEPTH]; |
1941 | struct xfrm_kmaddress km, *kmp; |
1942 | u8 type; |
1943 | int err; |
1944 | int n = 0; |
1945 | |
1946 | if (attrs[XFRMA_MIGRATE] == NULL) |
1947 | return -EINVAL; |
1948 | |
1949 | kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL; |
1950 | |
1951 | err = copy_from_user_policy_type(&type, attrs); |
1952 | if (err) |
1953 | return err; |
1954 | |
1955 | err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n); |
1956 | if (err) |
1957 | return err; |
1958 | |
1959 | if (!n) |
1960 | return 0; |
1961 | |
1962 | xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp); |
1963 | |
1964 | return 0; |
1965 | } |
1966 | #else |
1967 | static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh, |
1968 | struct nlattr **attrs) |
1969 | { |
1970 | return -ENOPROTOOPT; |
1971 | } |
1972 | #endif |
1973 | |
1974 | #ifdef CONFIG_XFRM_MIGRATE |
1975 | static int copy_to_user_migrate(struct xfrm_migrate *m, struct sk_buff *skb) |
1976 | { |
1977 | struct xfrm_user_migrate um; |
1978 | |
1979 | memset(&um, 0, sizeof(um)); |
1980 | um.proto = m->proto; |
1981 | um.mode = m->mode; |
1982 | um.reqid = m->reqid; |
1983 | um.old_family = m->old_family; |
1984 | memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr)); |
1985 | memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr)); |
1986 | um.new_family = m->new_family; |
1987 | memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr)); |
1988 | memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr)); |
1989 | |
1990 | return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um); |
1991 | } |
1992 | |
1993 | static int copy_to_user_kmaddress(struct xfrm_kmaddress *k, struct sk_buff *skb) |
1994 | { |
1995 | struct xfrm_user_kmaddress uk; |
1996 | |
1997 | memset(&uk, 0, sizeof(uk)); |
1998 | uk.family = k->family; |
1999 | uk.reserved = k->reserved; |
2000 | memcpy(&uk.local, &k->local, sizeof(uk.local)); |
2001 | memcpy(&uk.remote, &k->remote, sizeof(uk.remote)); |
2002 | |
2003 | return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk); |
2004 | } |
2005 | |
2006 | static inline size_t xfrm_migrate_msgsize(int num_migrate, int with_kma) |
2007 | { |
2008 | return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id)) |
2009 | + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0) |
2010 | + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate) |
2011 | + userpolicy_type_attrsize(); |
2012 | } |
2013 | |
2014 | static int build_migrate(struct sk_buff *skb, struct xfrm_migrate *m, |
2015 | int num_migrate, struct xfrm_kmaddress *k, |
2016 | struct xfrm_selector *sel, u8 dir, u8 type) |
2017 | { |
2018 | struct xfrm_migrate *mp; |
2019 | struct xfrm_userpolicy_id *pol_id; |
2020 | struct nlmsghdr *nlh; |
2021 | int i; |
2022 | |
2023 | nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0); |
2024 | if (nlh == NULL) |
2025 | return -EMSGSIZE; |
2026 | |
2027 | pol_id = nlmsg_data(nlh); |
2028 | /* copy data from selector, dir, and type to the pol_id */ |
2029 | memset(pol_id, 0, sizeof(*pol_id)); |
2030 | memcpy(&pol_id->sel, sel, sizeof(pol_id->sel)); |
2031 | pol_id->dir = dir; |
2032 | |
2033 | if (k != NULL && (copy_to_user_kmaddress(k, skb) < 0)) |
2034 | goto nlmsg_failure; |
2035 | |
2036 | if (copy_to_user_policy_type(type, skb) < 0) |
2037 | goto nlmsg_failure; |
2038 | |
2039 | for (i = 0, mp = m ; i < num_migrate; i++, mp++) { |
2040 | if (copy_to_user_migrate(mp, skb) < 0) |
2041 | goto nlmsg_failure; |
2042 | } |
2043 | |
2044 | return nlmsg_end(skb, nlh); |
2045 | nlmsg_failure: |
2046 | nlmsg_cancel(skb, nlh); |
2047 | return -EMSGSIZE; |
2048 | } |
2049 | |
2050 | static int xfrm_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type, |
2051 | struct xfrm_migrate *m, int num_migrate, |
2052 | struct xfrm_kmaddress *k) |
2053 | { |
2054 | struct net *net = &init_net; |
2055 | struct sk_buff *skb; |
2056 | |
2057 | skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k), GFP_ATOMIC); |
2058 | if (skb == NULL) |
2059 | return -ENOMEM; |
2060 | |
2061 | /* build migrate */ |
2062 | if (build_migrate(skb, m, num_migrate, k, sel, dir, type) < 0) |
2063 | BUG(); |
2064 | |
2065 | return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MIGRATE, GFP_ATOMIC); |
2066 | } |
2067 | #else |
2068 | static int xfrm_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type, |
2069 | struct xfrm_migrate *m, int num_migrate, |
2070 | struct xfrm_kmaddress *k) |
2071 | { |
2072 | return -ENOPROTOOPT; |
2073 | } |
2074 | #endif |
2075 | |
2076 | #define XMSGSIZE(type) sizeof(struct type) |
2077 | |
2078 | static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = { |
2079 | [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), |
2080 | [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), |
2081 | [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), |
2082 | [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), |
2083 | [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), |
2084 | [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), |
2085 | [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info), |
2086 | [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire), |
2087 | [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire), |
2088 | [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), |
2089 | [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), |
2090 | [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire), |
2091 | [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush), |
2092 | [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0, |
2093 | [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), |
2094 | [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), |
2095 | [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report), |
2096 | [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), |
2097 | [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32), |
2098 | [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32), |
2099 | }; |
2100 | |
2101 | #undef XMSGSIZE |
2102 | |
2103 | static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = { |
2104 | [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)}, |
2105 | [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)}, |
2106 | [XFRMA_LASTUSED] = { .type = NLA_U64}, |
2107 | [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)}, |
2108 | [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) }, |
2109 | [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) }, |
2110 | [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) }, |
2111 | [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) }, |
2112 | [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) }, |
2113 | [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) }, |
2114 | [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) }, |
2115 | [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) }, |
2116 | [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) }, |
2117 | [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 }, |
2118 | [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 }, |
2119 | [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) }, |
2120 | [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) }, |
2121 | [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)}, |
2122 | [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) }, |
2123 | [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) }, |
2124 | [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) }, |
2125 | }; |
2126 | |
2127 | static struct xfrm_link { |
2128 | int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **); |
2129 | int (*dump)(struct sk_buff *, struct netlink_callback *); |
2130 | int (*done)(struct netlink_callback *); |
2131 | } xfrm_dispatch[XFRM_NR_MSGTYPES] = { |
2132 | [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, |
2133 | [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa }, |
2134 | [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa, |
2135 | .dump = xfrm_dump_sa, |
2136 | .done = xfrm_dump_sa_done }, |
2137 | [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, |
2138 | [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy }, |
2139 | [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy, |
2140 | .dump = xfrm_dump_policy, |
2141 | .done = xfrm_dump_policy_done }, |
2142 | [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi }, |
2143 | [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire }, |
2144 | [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire }, |
2145 | [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, |
2146 | [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, |
2147 | [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire}, |
2148 | [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa }, |
2149 | [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy }, |
2150 | [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae }, |
2151 | [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae }, |
2152 | [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate }, |
2153 | [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo }, |
2154 | [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo }, |
2155 | }; |
2156 | |
2157 | static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) |
2158 | { |
2159 | struct net *net = sock_net(skb->sk); |
2160 | struct nlattr *attrs[XFRMA_MAX+1]; |
2161 | struct xfrm_link *link; |
2162 | int type, err; |
2163 | |
2164 | type = nlh->nlmsg_type; |
2165 | if (type > XFRM_MSG_MAX) |
2166 | return -EINVAL; |
2167 | |
2168 | type -= XFRM_MSG_BASE; |
2169 | link = &xfrm_dispatch[type]; |
2170 | |
2171 | /* All operations require privileges, even GET */ |
2172 | if (security_netlink_recv(skb, CAP_NET_ADMIN)) |
2173 | return -EPERM; |
2174 | |
2175 | if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) || |
2176 | type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) && |
2177 | (nlh->nlmsg_flags & NLM_F_DUMP)) { |
2178 | if (link->dump == NULL) |
2179 | return -EINVAL; |
2180 | |
2181 | return netlink_dump_start(net->xfrm.nlsk, skb, nlh, link->dump, link->done); |
2182 | } |
2183 | |
2184 | err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs, XFRMA_MAX, |
2185 | xfrma_policy); |
2186 | if (err < 0) |
2187 | return err; |
2188 | |
2189 | if (link->doit == NULL) |
2190 | return -EINVAL; |
2191 | |
2192 | return link->doit(skb, nlh, attrs); |
2193 | } |
2194 | |
2195 | static void xfrm_netlink_rcv(struct sk_buff *skb) |
2196 | { |
2197 | mutex_lock(&xfrm_cfg_mutex); |
2198 | netlink_rcv_skb(skb, &xfrm_user_rcv_msg); |
2199 | mutex_unlock(&xfrm_cfg_mutex); |
2200 | } |
2201 | |
2202 | static inline size_t xfrm_expire_msgsize(void) |
2203 | { |
2204 | return NLMSG_ALIGN(sizeof(struct xfrm_user_expire)) |
2205 | + nla_total_size(sizeof(struct xfrm_mark)); |
2206 | } |
2207 | |
2208 | static int build_expire(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c) |
2209 | { |
2210 | struct xfrm_user_expire *ue; |
2211 | struct nlmsghdr *nlh; |
2212 | |
2213 | nlh = nlmsg_put(skb, c->pid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0); |
2214 | if (nlh == NULL) |
2215 | return -EMSGSIZE; |
2216 | |
2217 | ue = nlmsg_data(nlh); |
2218 | copy_to_user_state(x, &ue->state); |
2219 | ue->hard = (c->data.hard != 0) ? 1 : 0; |
2220 | |
2221 | if (xfrm_mark_put(skb, &x->mark)) |
2222 | goto nla_put_failure; |
2223 | |
2224 | return nlmsg_end(skb, nlh); |
2225 | |
2226 | nla_put_failure: |
2227 | return -EMSGSIZE; |
2228 | } |
2229 | |
2230 | static int xfrm_exp_state_notify(struct xfrm_state *x, struct km_event *c) |
2231 | { |
2232 | struct net *net = xs_net(x); |
2233 | struct sk_buff *skb; |
2234 | |
2235 | skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC); |
2236 | if (skb == NULL) |
2237 | return -ENOMEM; |
2238 | |
2239 | if (build_expire(skb, x, c) < 0) { |
2240 | kfree_skb(skb); |
2241 | return -EMSGSIZE; |
2242 | } |
2243 | |
2244 | return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC); |
2245 | } |
2246 | |
2247 | static int xfrm_aevent_state_notify(struct xfrm_state *x, struct km_event *c) |
2248 | { |
2249 | struct net *net = xs_net(x); |
2250 | struct sk_buff *skb; |
2251 | |
2252 | skb = nlmsg_new(xfrm_aevent_msgsize(), GFP_ATOMIC); |
2253 | if (skb == NULL) |
2254 | return -ENOMEM; |
2255 | |
2256 | if (build_aevent(skb, x, c) < 0) |
2257 | BUG(); |
2258 | |
2259 | return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_AEVENTS, GFP_ATOMIC); |
2260 | } |
2261 | |
2262 | static int xfrm_notify_sa_flush(struct km_event *c) |
2263 | { |
2264 | struct net *net = c->net; |
2265 | struct xfrm_usersa_flush *p; |
2266 | struct nlmsghdr *nlh; |
2267 | struct sk_buff *skb; |
2268 | int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush)); |
2269 | |
2270 | skb = nlmsg_new(len, GFP_ATOMIC); |
2271 | if (skb == NULL) |
2272 | return -ENOMEM; |
2273 | |
2274 | nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0); |
2275 | if (nlh == NULL) { |
2276 | kfree_skb(skb); |
2277 | return -EMSGSIZE; |
2278 | } |
2279 | |
2280 | p = nlmsg_data(nlh); |
2281 | p->proto = c->data.proto; |
2282 | |
2283 | nlmsg_end(skb, nlh); |
2284 | |
2285 | return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC); |
2286 | } |
2287 | |
2288 | static inline size_t xfrm_sa_len(struct xfrm_state *x) |
2289 | { |
2290 | size_t l = 0; |
2291 | if (x->aead) |
2292 | l += nla_total_size(aead_len(x->aead)); |
2293 | if (x->aalg) { |
2294 | l += nla_total_size(sizeof(struct xfrm_algo) + |
2295 | (x->aalg->alg_key_len + 7) / 8); |
2296 | l += nla_total_size(xfrm_alg_auth_len(x->aalg)); |
2297 | } |
2298 | if (x->ealg) |
2299 | l += nla_total_size(xfrm_alg_len(x->ealg)); |
2300 | if (x->calg) |
2301 | l += nla_total_size(sizeof(*x->calg)); |
2302 | if (x->encap) |
2303 | l += nla_total_size(sizeof(*x->encap)); |
2304 | if (x->security) |
2305 | l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) + |
2306 | x->security->ctx_len); |
2307 | if (x->coaddr) |
2308 | l += nla_total_size(sizeof(*x->coaddr)); |
2309 | |
2310 | /* Must count x->lastused as it may become non-zero behind our back. */ |
2311 | l += nla_total_size(sizeof(u64)); |
2312 | |
2313 | return l; |
2314 | } |
2315 | |
2316 | static int xfrm_notify_sa(struct xfrm_state *x, struct km_event *c) |
2317 | { |
2318 | struct net *net = xs_net(x); |
2319 | struct xfrm_usersa_info *p; |
2320 | struct xfrm_usersa_id *id; |
2321 | struct nlmsghdr *nlh; |
2322 | struct sk_buff *skb; |
2323 | int len = xfrm_sa_len(x); |
2324 | int headlen; |
2325 | |
2326 | headlen = sizeof(*p); |
2327 | if (c->event == XFRM_MSG_DELSA) { |
2328 | len += nla_total_size(headlen); |
2329 | headlen = sizeof(*id); |
2330 | len += nla_total_size(sizeof(struct xfrm_mark)); |
2331 | } |
2332 | len += NLMSG_ALIGN(headlen); |
2333 | |
2334 | skb = nlmsg_new(len, GFP_ATOMIC); |
2335 | if (skb == NULL) |
2336 | return -ENOMEM; |
2337 | |
2338 | nlh = nlmsg_put(skb, c->pid, c->seq, c->event, headlen, 0); |
2339 | if (nlh == NULL) |
2340 | goto nla_put_failure; |
2341 | |
2342 | p = nlmsg_data(nlh); |
2343 | if (c->event == XFRM_MSG_DELSA) { |
2344 | struct nlattr *attr; |
2345 | |
2346 | id = nlmsg_data(nlh); |
2347 | memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr)); |
2348 | id->spi = x->id.spi; |
2349 | id->family = x->props.family; |
2350 | id->proto = x->id.proto; |
2351 | |
2352 | attr = nla_reserve(skb, XFRMA_SA, sizeof(*p)); |
2353 | if (attr == NULL) |
2354 | goto nla_put_failure; |
2355 | |
2356 | p = nla_data(attr); |
2357 | } |
2358 | |
2359 | if (copy_to_user_state_extra(x, p, skb)) |
2360 | goto nla_put_failure; |
2361 | |
2362 | nlmsg_end(skb, nlh); |
2363 | |
2364 | return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC); |
2365 | |
2366 | nla_put_failure: |
2367 | /* Somebody screwed up with xfrm_sa_len! */ |
2368 | WARN_ON(1); |
2369 | kfree_skb(skb); |
2370 | return -1; |
2371 | } |
2372 | |
2373 | static int xfrm_send_state_notify(struct xfrm_state *x, struct km_event *c) |
2374 | { |
2375 | |
2376 | switch (c->event) { |
2377 | case XFRM_MSG_EXPIRE: |
2378 | return xfrm_exp_state_notify(x, c); |
2379 | case XFRM_MSG_NEWAE: |
2380 | return xfrm_aevent_state_notify(x, c); |
2381 | case XFRM_MSG_DELSA: |
2382 | case XFRM_MSG_UPDSA: |
2383 | case XFRM_MSG_NEWSA: |
2384 | return xfrm_notify_sa(x, c); |
2385 | case XFRM_MSG_FLUSHSA: |
2386 | return xfrm_notify_sa_flush(c); |
2387 | default: |
2388 | printk("xfrm_user: Unknown SA event %d\n", c->event); |
2389 | break; |
2390 | } |
2391 | |
2392 | return 0; |
2393 | |
2394 | } |
2395 | |
2396 | static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x, |
2397 | struct xfrm_policy *xp) |
2398 | { |
2399 | return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire)) |
2400 | + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr) |
2401 | + nla_total_size(sizeof(struct xfrm_mark)) |
2402 | + nla_total_size(xfrm_user_sec_ctx_size(x->security)) |
2403 | + userpolicy_type_attrsize(); |
2404 | } |
2405 | |
2406 | static int build_acquire(struct sk_buff *skb, struct xfrm_state *x, |
2407 | struct xfrm_tmpl *xt, struct xfrm_policy *xp, |
2408 | int dir) |
2409 | { |
2410 | struct xfrm_user_acquire *ua; |
2411 | struct nlmsghdr *nlh; |
2412 | __u32 seq = xfrm_get_acqseq(); |
2413 | |
2414 | nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0); |
2415 | if (nlh == NULL) |
2416 | return -EMSGSIZE; |
2417 | |
2418 | ua = nlmsg_data(nlh); |
2419 | memcpy(&ua->id, &x->id, sizeof(ua->id)); |
2420 | memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr)); |
2421 | memcpy(&ua->sel, &x->sel, sizeof(ua->sel)); |
2422 | copy_to_user_policy(xp, &ua->policy, dir); |
2423 | ua->aalgos = xt->aalgos; |
2424 | ua->ealgos = xt->ealgos; |
2425 | ua->calgos = xt->calgos; |
2426 | ua->seq = x->km.seq = seq; |
2427 | |
2428 | if (copy_to_user_tmpl(xp, skb) < 0) |
2429 | goto nlmsg_failure; |
2430 | if (copy_to_user_state_sec_ctx(x, skb)) |
2431 | goto nlmsg_failure; |
2432 | if (copy_to_user_policy_type(xp->type, skb) < 0) |
2433 | goto nlmsg_failure; |
2434 | if (xfrm_mark_put(skb, &xp->mark)) |
2435 | goto nla_put_failure; |
2436 | |
2437 | return nlmsg_end(skb, nlh); |
2438 | |
2439 | nla_put_failure: |
2440 | nlmsg_failure: |
2441 | nlmsg_cancel(skb, nlh); |
2442 | return -EMSGSIZE; |
2443 | } |
2444 | |
2445 | static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt, |
2446 | struct xfrm_policy *xp, int dir) |
2447 | { |
2448 | struct net *net = xs_net(x); |
2449 | struct sk_buff *skb; |
2450 | |
2451 | skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC); |
2452 | if (skb == NULL) |
2453 | return -ENOMEM; |
2454 | |
2455 | if (build_acquire(skb, x, xt, xp, dir) < 0) |
2456 | BUG(); |
2457 | |
2458 | return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_ACQUIRE, GFP_ATOMIC); |
2459 | } |
2460 | |
2461 | /* User gives us xfrm_user_policy_info followed by an array of 0 |
2462 | * or more templates. |
2463 | */ |
2464 | static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt, |
2465 | u8 *data, int len, int *dir) |
2466 | { |
2467 | struct net *net = sock_net(sk); |
2468 | struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data; |
2469 | struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1); |
2470 | struct xfrm_policy *xp; |
2471 | int nr; |
2472 | |
2473 | switch (sk->sk_family) { |
2474 | case AF_INET: |
2475 | if (opt != IP_XFRM_POLICY) { |
2476 | *dir = -EOPNOTSUPP; |
2477 | return NULL; |
2478 | } |
2479 | break; |
2480 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
2481 | case AF_INET6: |
2482 | if (opt != IPV6_XFRM_POLICY) { |
2483 | *dir = -EOPNOTSUPP; |
2484 | return NULL; |
2485 | } |
2486 | break; |
2487 | #endif |
2488 | default: |
2489 | *dir = -EINVAL; |
2490 | return NULL; |
2491 | } |
2492 | |
2493 | *dir = -EINVAL; |
2494 | |
2495 | if (len < sizeof(*p) || |
2496 | verify_newpolicy_info(p)) |
2497 | return NULL; |
2498 | |
2499 | nr = ((len - sizeof(*p)) / sizeof(*ut)); |
2500 | if (validate_tmpl(nr, ut, p->sel.family)) |
2501 | return NULL; |
2502 | |
2503 | if (p->dir > XFRM_POLICY_OUT) |
2504 | return NULL; |
2505 | |
2506 | xp = xfrm_policy_alloc(net, GFP_KERNEL); |
2507 | if (xp == NULL) { |
2508 | *dir = -ENOBUFS; |
2509 | return NULL; |
2510 | } |
2511 | |
2512 | copy_from_user_policy(xp, p); |
2513 | xp->type = XFRM_POLICY_TYPE_MAIN; |
2514 | copy_templates(xp, ut, nr); |
2515 | |
2516 | *dir = p->dir; |
2517 | |
2518 | return xp; |
2519 | } |
2520 | |
2521 | static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp) |
2522 | { |
2523 | return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire)) |
2524 | + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr) |
2525 | + nla_total_size(xfrm_user_sec_ctx_size(xp->security)) |
2526 | + nla_total_size(sizeof(struct xfrm_mark)) |
2527 | + userpolicy_type_attrsize(); |
2528 | } |
2529 | |
2530 | static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp, |
2531 | int dir, struct km_event *c) |
2532 | { |
2533 | struct xfrm_user_polexpire *upe; |
2534 | struct nlmsghdr *nlh; |
2535 | int hard = c->data.hard; |
2536 | |
2537 | nlh = nlmsg_put(skb, c->pid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0); |
2538 | if (nlh == NULL) |
2539 | return -EMSGSIZE; |
2540 | |
2541 | upe = nlmsg_data(nlh); |
2542 | copy_to_user_policy(xp, &upe->pol, dir); |
2543 | if (copy_to_user_tmpl(xp, skb) < 0) |
2544 | goto nlmsg_failure; |
2545 | if (copy_to_user_sec_ctx(xp, skb)) |
2546 | goto nlmsg_failure; |
2547 | if (copy_to_user_policy_type(xp->type, skb) < 0) |
2548 | goto nlmsg_failure; |
2549 | if (xfrm_mark_put(skb, &xp->mark)) |
2550 | goto nla_put_failure; |
2551 | upe->hard = !!hard; |
2552 | |
2553 | return nlmsg_end(skb, nlh); |
2554 | |
2555 | nla_put_failure: |
2556 | nlmsg_failure: |
2557 | nlmsg_cancel(skb, nlh); |
2558 | return -EMSGSIZE; |
2559 | } |
2560 | |
2561 | static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c) |
2562 | { |
2563 | struct net *net = xp_net(xp); |
2564 | struct sk_buff *skb; |
2565 | |
2566 | skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC); |
2567 | if (skb == NULL) |
2568 | return -ENOMEM; |
2569 | |
2570 | if (build_polexpire(skb, xp, dir, c) < 0) |
2571 | BUG(); |
2572 | |
2573 | return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC); |
2574 | } |
2575 | |
2576 | static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c) |
2577 | { |
2578 | struct net *net = xp_net(xp); |
2579 | struct xfrm_userpolicy_info *p; |
2580 | struct xfrm_userpolicy_id *id; |
2581 | struct nlmsghdr *nlh; |
2582 | struct sk_buff *skb; |
2583 | int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr); |
2584 | int headlen; |
2585 | |
2586 | headlen = sizeof(*p); |
2587 | if (c->event == XFRM_MSG_DELPOLICY) { |
2588 | len += nla_total_size(headlen); |
2589 | headlen = sizeof(*id); |
2590 | } |
2591 | len += userpolicy_type_attrsize(); |
2592 | len += nla_total_size(sizeof(struct xfrm_mark)); |
2593 | len += NLMSG_ALIGN(headlen); |
2594 | |
2595 | skb = nlmsg_new(len, GFP_ATOMIC); |
2596 | if (skb == NULL) |
2597 | return -ENOMEM; |
2598 | |
2599 | nlh = nlmsg_put(skb, c->pid, c->seq, c->event, headlen, 0); |
2600 | if (nlh == NULL) |
2601 | goto nlmsg_failure; |
2602 | |
2603 | p = nlmsg_data(nlh); |
2604 | if (c->event == XFRM_MSG_DELPOLICY) { |
2605 | struct nlattr *attr; |
2606 | |
2607 | id = nlmsg_data(nlh); |
2608 | memset(id, 0, sizeof(*id)); |
2609 | id->dir = dir; |
2610 | if (c->data.byid) |
2611 | id->index = xp->index; |
2612 | else |
2613 | memcpy(&id->sel, &xp->selector, sizeof(id->sel)); |
2614 | |
2615 | attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p)); |
2616 | if (attr == NULL) |
2617 | goto nlmsg_failure; |
2618 | |
2619 | p = nla_data(attr); |
2620 | } |
2621 | |
2622 | copy_to_user_policy(xp, p, dir); |
2623 | if (copy_to_user_tmpl(xp, skb) < 0) |
2624 | goto nlmsg_failure; |
2625 | if (copy_to_user_policy_type(xp->type, skb) < 0) |
2626 | goto nlmsg_failure; |
2627 | |
2628 | if (xfrm_mark_put(skb, &xp->mark)) |
2629 | goto nla_put_failure; |
2630 | |
2631 | nlmsg_end(skb, nlh); |
2632 | |
2633 | return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC); |
2634 | |
2635 | nla_put_failure: |
2636 | nlmsg_failure: |
2637 | kfree_skb(skb); |
2638 | return -1; |
2639 | } |
2640 | |
2641 | static int xfrm_notify_policy_flush(struct km_event *c) |
2642 | { |
2643 | struct net *net = c->net; |
2644 | struct nlmsghdr *nlh; |
2645 | struct sk_buff *skb; |
2646 | |
2647 | skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC); |
2648 | if (skb == NULL) |
2649 | return -ENOMEM; |
2650 | |
2651 | nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0); |
2652 | if (nlh == NULL) |
2653 | goto nlmsg_failure; |
2654 | if (copy_to_user_policy_type(c->data.type, skb) < 0) |
2655 | goto nlmsg_failure; |
2656 | |
2657 | nlmsg_end(skb, nlh); |
2658 | |
2659 | return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC); |
2660 | |
2661 | nlmsg_failure: |
2662 | kfree_skb(skb); |
2663 | return -1; |
2664 | } |
2665 | |
2666 | static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c) |
2667 | { |
2668 | |
2669 | switch (c->event) { |
2670 | case XFRM_MSG_NEWPOLICY: |
2671 | case XFRM_MSG_UPDPOLICY: |
2672 | case XFRM_MSG_DELPOLICY: |
2673 | return xfrm_notify_policy(xp, dir, c); |
2674 | case XFRM_MSG_FLUSHPOLICY: |
2675 | return xfrm_notify_policy_flush(c); |
2676 | case XFRM_MSG_POLEXPIRE: |
2677 | return xfrm_exp_policy_notify(xp, dir, c); |
2678 | default: |
2679 | printk("xfrm_user: Unknown Policy event %d\n", c->event); |
2680 | } |
2681 | |
2682 | return 0; |
2683 | |
2684 | } |
2685 | |
2686 | static inline size_t xfrm_report_msgsize(void) |
2687 | { |
2688 | return NLMSG_ALIGN(sizeof(struct xfrm_user_report)); |
2689 | } |
2690 | |
2691 | static int build_report(struct sk_buff *skb, u8 proto, |
2692 | struct xfrm_selector *sel, xfrm_address_t *addr) |
2693 | { |
2694 | struct xfrm_user_report *ur; |
2695 | struct nlmsghdr *nlh; |
2696 | |
2697 | nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0); |
2698 | if (nlh == NULL) |
2699 | return -EMSGSIZE; |
2700 | |
2701 | ur = nlmsg_data(nlh); |
2702 | ur->proto = proto; |
2703 | memcpy(&ur->sel, sel, sizeof(ur->sel)); |
2704 | |
2705 | if (addr) |
2706 | NLA_PUT(skb, XFRMA_COADDR, sizeof(*addr), addr); |
2707 | |
2708 | return nlmsg_end(skb, nlh); |
2709 | |
2710 | nla_put_failure: |
2711 | nlmsg_cancel(skb, nlh); |
2712 | return -EMSGSIZE; |
2713 | } |
2714 | |
2715 | static int xfrm_send_report(struct net *net, u8 proto, |
2716 | struct xfrm_selector *sel, xfrm_address_t *addr) |
2717 | { |
2718 | struct sk_buff *skb; |
2719 | |
2720 | skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC); |
2721 | if (skb == NULL) |
2722 | return -ENOMEM; |
2723 | |
2724 | if (build_report(skb, proto, sel, addr) < 0) |
2725 | BUG(); |
2726 | |
2727 | return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_REPORT, GFP_ATOMIC); |
2728 | } |
2729 | |
2730 | static inline size_t xfrm_mapping_msgsize(void) |
2731 | { |
2732 | return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping)); |
2733 | } |
2734 | |
2735 | static int build_mapping(struct sk_buff *skb, struct xfrm_state *x, |
2736 | xfrm_address_t *new_saddr, __be16 new_sport) |
2737 | { |
2738 | struct xfrm_user_mapping *um; |
2739 | struct nlmsghdr *nlh; |
2740 | |
2741 | nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0); |
2742 | if (nlh == NULL) |
2743 | return -EMSGSIZE; |
2744 | |
2745 | um = nlmsg_data(nlh); |
2746 | |
2747 | memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr)); |
2748 | um->id.spi = x->id.spi; |
2749 | um->id.family = x->props.family; |
2750 | um->id.proto = x->id.proto; |
2751 | memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr)); |
2752 | memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr)); |
2753 | um->new_sport = new_sport; |
2754 | um->old_sport = x->encap->encap_sport; |
2755 | um->reqid = x->props.reqid; |
2756 | |
2757 | return nlmsg_end(skb, nlh); |
2758 | } |
2759 | |
2760 | static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, |
2761 | __be16 sport) |
2762 | { |
2763 | struct net *net = xs_net(x); |
2764 | struct sk_buff *skb; |
2765 | |
2766 | if (x->id.proto != IPPROTO_ESP) |
2767 | return -EINVAL; |
2768 | |
2769 | if (!x->encap) |
2770 | return -EINVAL; |
2771 | |
2772 | skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC); |
2773 | if (skb == NULL) |
2774 | return -ENOMEM; |
2775 | |
2776 | if (build_mapping(skb, x, ipaddr, sport) < 0) |
2777 | BUG(); |
2778 | |
2779 | return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MAPPING, GFP_ATOMIC); |
2780 | } |
2781 | |
2782 | static struct xfrm_mgr netlink_mgr = { |
2783 | .id = "netlink", |
2784 | .notify = xfrm_send_state_notify, |
2785 | .acquire = xfrm_send_acquire, |
2786 | .compile_policy = xfrm_compile_policy, |
2787 | .notify_policy = xfrm_send_policy_notify, |
2788 | .report = xfrm_send_report, |
2789 | .migrate = xfrm_send_migrate, |
2790 | .new_mapping = xfrm_send_mapping, |
2791 | }; |
2792 | |
2793 | static int __net_init xfrm_user_net_init(struct net *net) |
2794 | { |
2795 | struct sock *nlsk; |
2796 | |
2797 | nlsk = netlink_kernel_create(net, NETLINK_XFRM, XFRMNLGRP_MAX, |
2798 | xfrm_netlink_rcv, NULL, THIS_MODULE); |
2799 | if (nlsk == NULL) |
2800 | return -ENOMEM; |
2801 | net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */ |
2802 | rcu_assign_pointer(net->xfrm.nlsk, nlsk); |
2803 | return 0; |
2804 | } |
2805 | |
2806 | static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list) |
2807 | { |
2808 | struct net *net; |
2809 | list_for_each_entry(net, net_exit_list, exit_list) |
2810 | rcu_assign_pointer(net->xfrm.nlsk, NULL); |
2811 | synchronize_net(); |
2812 | list_for_each_entry(net, net_exit_list, exit_list) |
2813 | netlink_kernel_release(net->xfrm.nlsk_stash); |
2814 | } |
2815 | |
2816 | static struct pernet_operations xfrm_user_net_ops = { |
2817 | .init = xfrm_user_net_init, |
2818 | .exit_batch = xfrm_user_net_exit, |
2819 | }; |
2820 | |
2821 | static int __init xfrm_user_init(void) |
2822 | { |
2823 | int rv; |
2824 | |
2825 | printk(KERN_INFO "Initializing XFRM netlink socket\n"); |
2826 | |
2827 | rv = register_pernet_subsys(&xfrm_user_net_ops); |
2828 | if (rv < 0) |
2829 | return rv; |
2830 | rv = xfrm_register_km(&netlink_mgr); |
2831 | if (rv < 0) |
2832 | unregister_pernet_subsys(&xfrm_user_net_ops); |
2833 | return rv; |
2834 | } |
2835 | |
2836 | static void __exit xfrm_user_exit(void) |
2837 | { |
2838 | xfrm_unregister_km(&netlink_mgr); |
2839 | unregister_pernet_subsys(&xfrm_user_net_ops); |
2840 | } |
2841 | |
2842 | module_init(xfrm_user_init); |
2843 | module_exit(xfrm_user_exit); |
2844 | MODULE_LICENSE("GPL"); |
2845 | MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM); |
2846 | |
2847 |
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Tags:
od-2011-09-04
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v2.6.34-rc5
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