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1da177e4 LT |
1 | /* |
2 | * net/key/af_key.c An implementation of PF_KEYv2 sockets. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version | |
7 | * 2 of the License, or (at your option) any later version. | |
8 | * | |
9 | * Authors: Maxim Giryaev <gem@asplinux.ru> | |
10 | * David S. Miller <davem@redhat.com> | |
11 | * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> | |
12 | * Kunihiro Ishiguro <kunihiro@ipinfusion.com> | |
13 | * Kazunori MIYAZAWA / USAGI Project <miyazawa@linux-ipv6.org> | |
14 | * Derek Atkins <derek@ihtfp.com> | |
15 | */ | |
16 | ||
17 | #include <linux/config.h> | |
4fc268d2 | 18 | #include <linux/capability.h> |
1da177e4 LT |
19 | #include <linux/module.h> |
20 | #include <linux/kernel.h> | |
21 | #include <linux/socket.h> | |
22 | #include <linux/pfkeyv2.h> | |
23 | #include <linux/ipsec.h> | |
24 | #include <linux/skbuff.h> | |
25 | #include <linux/rtnetlink.h> | |
26 | #include <linux/in.h> | |
27 | #include <linux/in6.h> | |
28 | #include <linux/proc_fs.h> | |
29 | #include <linux/init.h> | |
30 | #include <net/xfrm.h> | |
31 | ||
32 | #include <net/sock.h> | |
33 | ||
34 | #define _X2KEY(x) ((x) == XFRM_INF ? 0 : (x)) | |
35 | #define _KEY2X(x) ((x) == 0 ? XFRM_INF : (x)) | |
36 | ||
37 | ||
38 | /* List of all pfkey sockets. */ | |
39 | static HLIST_HEAD(pfkey_table); | |
40 | static DECLARE_WAIT_QUEUE_HEAD(pfkey_table_wait); | |
41 | static DEFINE_RWLOCK(pfkey_table_lock); | |
42 | static atomic_t pfkey_table_users = ATOMIC_INIT(0); | |
43 | ||
44 | static atomic_t pfkey_socks_nr = ATOMIC_INIT(0); | |
45 | ||
46 | struct pfkey_sock { | |
47 | /* struct sock must be the first member of struct pfkey_sock */ | |
48 | struct sock sk; | |
49 | int registered; | |
50 | int promisc; | |
51 | }; | |
52 | ||
53 | static inline struct pfkey_sock *pfkey_sk(struct sock *sk) | |
54 | { | |
55 | return (struct pfkey_sock *)sk; | |
56 | } | |
57 | ||
58 | static void pfkey_sock_destruct(struct sock *sk) | |
59 | { | |
60 | skb_queue_purge(&sk->sk_receive_queue); | |
61 | ||
62 | if (!sock_flag(sk, SOCK_DEAD)) { | |
63 | printk("Attempt to release alive pfkey socket: %p\n", sk); | |
64 | return; | |
65 | } | |
66 | ||
67 | BUG_TRAP(!atomic_read(&sk->sk_rmem_alloc)); | |
68 | BUG_TRAP(!atomic_read(&sk->sk_wmem_alloc)); | |
69 | ||
70 | atomic_dec(&pfkey_socks_nr); | |
71 | } | |
72 | ||
73 | static void pfkey_table_grab(void) | |
74 | { | |
75 | write_lock_bh(&pfkey_table_lock); | |
76 | ||
77 | if (atomic_read(&pfkey_table_users)) { | |
78 | DECLARE_WAITQUEUE(wait, current); | |
79 | ||
80 | add_wait_queue_exclusive(&pfkey_table_wait, &wait); | |
81 | for(;;) { | |
82 | set_current_state(TASK_UNINTERRUPTIBLE); | |
83 | if (atomic_read(&pfkey_table_users) == 0) | |
84 | break; | |
85 | write_unlock_bh(&pfkey_table_lock); | |
86 | schedule(); | |
87 | write_lock_bh(&pfkey_table_lock); | |
88 | } | |
89 | ||
90 | __set_current_state(TASK_RUNNING); | |
91 | remove_wait_queue(&pfkey_table_wait, &wait); | |
92 | } | |
93 | } | |
94 | ||
95 | static __inline__ void pfkey_table_ungrab(void) | |
96 | { | |
97 | write_unlock_bh(&pfkey_table_lock); | |
98 | wake_up(&pfkey_table_wait); | |
99 | } | |
100 | ||
101 | static __inline__ void pfkey_lock_table(void) | |
102 | { | |
103 | /* read_lock() synchronizes us to pfkey_table_grab */ | |
104 | ||
105 | read_lock(&pfkey_table_lock); | |
106 | atomic_inc(&pfkey_table_users); | |
107 | read_unlock(&pfkey_table_lock); | |
108 | } | |
109 | ||
110 | static __inline__ void pfkey_unlock_table(void) | |
111 | { | |
112 | if (atomic_dec_and_test(&pfkey_table_users)) | |
113 | wake_up(&pfkey_table_wait); | |
114 | } | |
115 | ||
116 | ||
90ddc4f0 | 117 | static const struct proto_ops pfkey_ops; |
1da177e4 LT |
118 | |
119 | static void pfkey_insert(struct sock *sk) | |
120 | { | |
121 | pfkey_table_grab(); | |
122 | sk_add_node(sk, &pfkey_table); | |
123 | pfkey_table_ungrab(); | |
124 | } | |
125 | ||
126 | static void pfkey_remove(struct sock *sk) | |
127 | { | |
128 | pfkey_table_grab(); | |
129 | sk_del_node_init(sk); | |
130 | pfkey_table_ungrab(); | |
131 | } | |
132 | ||
133 | static struct proto key_proto = { | |
134 | .name = "KEY", | |
135 | .owner = THIS_MODULE, | |
136 | .obj_size = sizeof(struct pfkey_sock), | |
137 | }; | |
138 | ||
139 | static int pfkey_create(struct socket *sock, int protocol) | |
140 | { | |
141 | struct sock *sk; | |
142 | int err; | |
143 | ||
144 | if (!capable(CAP_NET_ADMIN)) | |
145 | return -EPERM; | |
146 | if (sock->type != SOCK_RAW) | |
147 | return -ESOCKTNOSUPPORT; | |
148 | if (protocol != PF_KEY_V2) | |
149 | return -EPROTONOSUPPORT; | |
150 | ||
151 | err = -ENOMEM; | |
152 | sk = sk_alloc(PF_KEY, GFP_KERNEL, &key_proto, 1); | |
153 | if (sk == NULL) | |
154 | goto out; | |
155 | ||
156 | sock->ops = &pfkey_ops; | |
157 | sock_init_data(sock, sk); | |
158 | ||
159 | sk->sk_family = PF_KEY; | |
160 | sk->sk_destruct = pfkey_sock_destruct; | |
161 | ||
162 | atomic_inc(&pfkey_socks_nr); | |
163 | ||
164 | pfkey_insert(sk); | |
165 | ||
166 | return 0; | |
167 | out: | |
168 | return err; | |
169 | } | |
170 | ||
171 | static int pfkey_release(struct socket *sock) | |
172 | { | |
173 | struct sock *sk = sock->sk; | |
174 | ||
175 | if (!sk) | |
176 | return 0; | |
177 | ||
178 | pfkey_remove(sk); | |
179 | ||
180 | sock_orphan(sk); | |
181 | sock->sk = NULL; | |
182 | skb_queue_purge(&sk->sk_write_queue); | |
183 | sock_put(sk); | |
184 | ||
185 | return 0; | |
186 | } | |
187 | ||
188 | static int pfkey_broadcast_one(struct sk_buff *skb, struct sk_buff **skb2, | |
dd0fc66f | 189 | gfp_t allocation, struct sock *sk) |
1da177e4 LT |
190 | { |
191 | int err = -ENOBUFS; | |
192 | ||
193 | sock_hold(sk); | |
194 | if (*skb2 == NULL) { | |
195 | if (atomic_read(&skb->users) != 1) { | |
196 | *skb2 = skb_clone(skb, allocation); | |
197 | } else { | |
198 | *skb2 = skb; | |
199 | atomic_inc(&skb->users); | |
200 | } | |
201 | } | |
202 | if (*skb2 != NULL) { | |
203 | if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf) { | |
204 | skb_orphan(*skb2); | |
205 | skb_set_owner_r(*skb2, sk); | |
206 | skb_queue_tail(&sk->sk_receive_queue, *skb2); | |
207 | sk->sk_data_ready(sk, (*skb2)->len); | |
208 | *skb2 = NULL; | |
209 | err = 0; | |
210 | } | |
211 | } | |
212 | sock_put(sk); | |
213 | return err; | |
214 | } | |
215 | ||
216 | /* Send SKB to all pfkey sockets matching selected criteria. */ | |
217 | #define BROADCAST_ALL 0 | |
218 | #define BROADCAST_ONE 1 | |
219 | #define BROADCAST_REGISTERED 2 | |
220 | #define BROADCAST_PROMISC_ONLY 4 | |
dd0fc66f | 221 | static int pfkey_broadcast(struct sk_buff *skb, gfp_t allocation, |
1da177e4 LT |
222 | int broadcast_flags, struct sock *one_sk) |
223 | { | |
224 | struct sock *sk; | |
225 | struct hlist_node *node; | |
226 | struct sk_buff *skb2 = NULL; | |
227 | int err = -ESRCH; | |
228 | ||
229 | /* XXX Do we need something like netlink_overrun? I think | |
230 | * XXX PF_KEY socket apps will not mind current behavior. | |
231 | */ | |
232 | if (!skb) | |
233 | return -ENOMEM; | |
234 | ||
235 | pfkey_lock_table(); | |
236 | sk_for_each(sk, node, &pfkey_table) { | |
237 | struct pfkey_sock *pfk = pfkey_sk(sk); | |
238 | int err2; | |
239 | ||
240 | /* Yes, it means that if you are meant to receive this | |
241 | * pfkey message you receive it twice as promiscuous | |
242 | * socket. | |
243 | */ | |
244 | if (pfk->promisc) | |
245 | pfkey_broadcast_one(skb, &skb2, allocation, sk); | |
246 | ||
247 | /* the exact target will be processed later */ | |
248 | if (sk == one_sk) | |
249 | continue; | |
250 | if (broadcast_flags != BROADCAST_ALL) { | |
251 | if (broadcast_flags & BROADCAST_PROMISC_ONLY) | |
252 | continue; | |
253 | if ((broadcast_flags & BROADCAST_REGISTERED) && | |
254 | !pfk->registered) | |
255 | continue; | |
256 | if (broadcast_flags & BROADCAST_ONE) | |
257 | continue; | |
258 | } | |
259 | ||
260 | err2 = pfkey_broadcast_one(skb, &skb2, allocation, sk); | |
261 | ||
262 | /* Error is cleare after succecful sending to at least one | |
263 | * registered KM */ | |
264 | if ((broadcast_flags & BROADCAST_REGISTERED) && err) | |
265 | err = err2; | |
266 | } | |
267 | pfkey_unlock_table(); | |
268 | ||
269 | if (one_sk != NULL) | |
270 | err = pfkey_broadcast_one(skb, &skb2, allocation, one_sk); | |
271 | ||
272 | if (skb2) | |
273 | kfree_skb(skb2); | |
274 | kfree_skb(skb); | |
275 | return err; | |
276 | } | |
277 | ||
278 | static inline void pfkey_hdr_dup(struct sadb_msg *new, struct sadb_msg *orig) | |
279 | { | |
280 | *new = *orig; | |
281 | } | |
282 | ||
283 | static int pfkey_error(struct sadb_msg *orig, int err, struct sock *sk) | |
284 | { | |
285 | struct sk_buff *skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL); | |
286 | struct sadb_msg *hdr; | |
287 | ||
288 | if (!skb) | |
289 | return -ENOBUFS; | |
290 | ||
291 | /* Woe be to the platform trying to support PFKEY yet | |
292 | * having normal errnos outside the 1-255 range, inclusive. | |
293 | */ | |
294 | err = -err; | |
295 | if (err == ERESTARTSYS || | |
296 | err == ERESTARTNOHAND || | |
297 | err == ERESTARTNOINTR) | |
298 | err = EINTR; | |
299 | if (err >= 512) | |
300 | err = EINVAL; | |
09a62660 | 301 | BUG_ON(err <= 0 || err >= 256); |
1da177e4 LT |
302 | |
303 | hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); | |
304 | pfkey_hdr_dup(hdr, orig); | |
305 | hdr->sadb_msg_errno = (uint8_t) err; | |
306 | hdr->sadb_msg_len = (sizeof(struct sadb_msg) / | |
307 | sizeof(uint64_t)); | |
308 | ||
309 | pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ONE, sk); | |
310 | ||
311 | return 0; | |
312 | } | |
313 | ||
314 | static u8 sadb_ext_min_len[] = { | |
315 | [SADB_EXT_RESERVED] = (u8) 0, | |
316 | [SADB_EXT_SA] = (u8) sizeof(struct sadb_sa), | |
317 | [SADB_EXT_LIFETIME_CURRENT] = (u8) sizeof(struct sadb_lifetime), | |
318 | [SADB_EXT_LIFETIME_HARD] = (u8) sizeof(struct sadb_lifetime), | |
319 | [SADB_EXT_LIFETIME_SOFT] = (u8) sizeof(struct sadb_lifetime), | |
320 | [SADB_EXT_ADDRESS_SRC] = (u8) sizeof(struct sadb_address), | |
321 | [SADB_EXT_ADDRESS_DST] = (u8) sizeof(struct sadb_address), | |
322 | [SADB_EXT_ADDRESS_PROXY] = (u8) sizeof(struct sadb_address), | |
323 | [SADB_EXT_KEY_AUTH] = (u8) sizeof(struct sadb_key), | |
324 | [SADB_EXT_KEY_ENCRYPT] = (u8) sizeof(struct sadb_key), | |
325 | [SADB_EXT_IDENTITY_SRC] = (u8) sizeof(struct sadb_ident), | |
326 | [SADB_EXT_IDENTITY_DST] = (u8) sizeof(struct sadb_ident), | |
327 | [SADB_EXT_SENSITIVITY] = (u8) sizeof(struct sadb_sens), | |
328 | [SADB_EXT_PROPOSAL] = (u8) sizeof(struct sadb_prop), | |
329 | [SADB_EXT_SUPPORTED_AUTH] = (u8) sizeof(struct sadb_supported), | |
330 | [SADB_EXT_SUPPORTED_ENCRYPT] = (u8) sizeof(struct sadb_supported), | |
331 | [SADB_EXT_SPIRANGE] = (u8) sizeof(struct sadb_spirange), | |
332 | [SADB_X_EXT_KMPRIVATE] = (u8) sizeof(struct sadb_x_kmprivate), | |
333 | [SADB_X_EXT_POLICY] = (u8) sizeof(struct sadb_x_policy), | |
334 | [SADB_X_EXT_SA2] = (u8) sizeof(struct sadb_x_sa2), | |
335 | [SADB_X_EXT_NAT_T_TYPE] = (u8) sizeof(struct sadb_x_nat_t_type), | |
336 | [SADB_X_EXT_NAT_T_SPORT] = (u8) sizeof(struct sadb_x_nat_t_port), | |
337 | [SADB_X_EXT_NAT_T_DPORT] = (u8) sizeof(struct sadb_x_nat_t_port), | |
338 | [SADB_X_EXT_NAT_T_OA] = (u8) sizeof(struct sadb_address), | |
df71837d | 339 | [SADB_X_EXT_SEC_CTX] = (u8) sizeof(struct sadb_x_sec_ctx), |
1da177e4 LT |
340 | }; |
341 | ||
342 | /* Verify sadb_address_{len,prefixlen} against sa_family. */ | |
343 | static int verify_address_len(void *p) | |
344 | { | |
345 | struct sadb_address *sp = p; | |
346 | struct sockaddr *addr = (struct sockaddr *)(sp + 1); | |
347 | struct sockaddr_in *sin; | |
348 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
349 | struct sockaddr_in6 *sin6; | |
350 | #endif | |
351 | int len; | |
352 | ||
353 | switch (addr->sa_family) { | |
354 | case AF_INET: | |
355 | len = sizeof(*sp) + sizeof(*sin) + (sizeof(uint64_t) - 1); | |
356 | len /= sizeof(uint64_t); | |
357 | if (sp->sadb_address_len != len || | |
358 | sp->sadb_address_prefixlen > 32) | |
359 | return -EINVAL; | |
360 | break; | |
361 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
362 | case AF_INET6: | |
363 | len = sizeof(*sp) + sizeof(*sin6) + (sizeof(uint64_t) - 1); | |
364 | len /= sizeof(uint64_t); | |
365 | if (sp->sadb_address_len != len || | |
366 | sp->sadb_address_prefixlen > 128) | |
367 | return -EINVAL; | |
368 | break; | |
369 | #endif | |
370 | default: | |
371 | /* It is user using kernel to keep track of security | |
372 | * associations for another protocol, such as | |
373 | * OSPF/RSVP/RIPV2/MIP. It is user's job to verify | |
374 | * lengths. | |
375 | * | |
376 | * XXX Actually, association/policy database is not yet | |
377 | * XXX able to cope with arbitrary sockaddr families. | |
378 | * XXX When it can, remove this -EINVAL. -DaveM | |
379 | */ | |
380 | return -EINVAL; | |
381 | break; | |
382 | }; | |
383 | ||
384 | return 0; | |
385 | } | |
386 | ||
df71837d TJ |
387 | static inline int pfkey_sec_ctx_len(struct sadb_x_sec_ctx *sec_ctx) |
388 | { | |
389 | int len = 0; | |
390 | ||
391 | len += sizeof(struct sadb_x_sec_ctx); | |
392 | len += sec_ctx->sadb_x_ctx_len; | |
393 | len += sizeof(uint64_t) - 1; | |
394 | len /= sizeof(uint64_t); | |
395 | ||
396 | return len; | |
397 | } | |
398 | ||
399 | static inline int verify_sec_ctx_len(void *p) | |
400 | { | |
401 | struct sadb_x_sec_ctx *sec_ctx = (struct sadb_x_sec_ctx *)p; | |
402 | int len; | |
403 | ||
404 | if (sec_ctx->sadb_x_ctx_len > PAGE_SIZE) | |
405 | return -EINVAL; | |
406 | ||
407 | len = pfkey_sec_ctx_len(sec_ctx); | |
408 | ||
409 | if (sec_ctx->sadb_x_sec_len != len) | |
410 | return -EINVAL; | |
411 | ||
412 | return 0; | |
413 | } | |
414 | ||
415 | static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(struct sadb_x_sec_ctx *sec_ctx) | |
416 | { | |
417 | struct xfrm_user_sec_ctx *uctx = NULL; | |
418 | int ctx_size = sec_ctx->sadb_x_ctx_len; | |
419 | ||
420 | uctx = kmalloc((sizeof(*uctx)+ctx_size), GFP_KERNEL); | |
421 | ||
422 | if (!uctx) | |
423 | return NULL; | |
424 | ||
425 | uctx->len = pfkey_sec_ctx_len(sec_ctx); | |
426 | uctx->exttype = sec_ctx->sadb_x_sec_exttype; | |
427 | uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi; | |
428 | uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg; | |
429 | uctx->ctx_len = sec_ctx->sadb_x_ctx_len; | |
430 | memcpy(uctx + 1, sec_ctx + 1, | |
431 | uctx->ctx_len); | |
432 | ||
433 | return uctx; | |
434 | } | |
435 | ||
1da177e4 LT |
436 | static int present_and_same_family(struct sadb_address *src, |
437 | struct sadb_address *dst) | |
438 | { | |
439 | struct sockaddr *s_addr, *d_addr; | |
440 | ||
441 | if (!src || !dst) | |
442 | return 0; | |
443 | ||
444 | s_addr = (struct sockaddr *)(src + 1); | |
445 | d_addr = (struct sockaddr *)(dst + 1); | |
446 | if (s_addr->sa_family != d_addr->sa_family) | |
447 | return 0; | |
448 | if (s_addr->sa_family != AF_INET | |
449 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
450 | && s_addr->sa_family != AF_INET6 | |
451 | #endif | |
452 | ) | |
453 | return 0; | |
454 | ||
455 | return 1; | |
456 | } | |
457 | ||
458 | static int parse_exthdrs(struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) | |
459 | { | |
460 | char *p = (char *) hdr; | |
461 | int len = skb->len; | |
462 | ||
463 | len -= sizeof(*hdr); | |
464 | p += sizeof(*hdr); | |
465 | while (len > 0) { | |
466 | struct sadb_ext *ehdr = (struct sadb_ext *) p; | |
467 | uint16_t ext_type; | |
468 | int ext_len; | |
469 | ||
470 | ext_len = ehdr->sadb_ext_len; | |
471 | ext_len *= sizeof(uint64_t); | |
472 | ext_type = ehdr->sadb_ext_type; | |
473 | if (ext_len < sizeof(uint64_t) || | |
474 | ext_len > len || | |
475 | ext_type == SADB_EXT_RESERVED) | |
476 | return -EINVAL; | |
477 | ||
478 | if (ext_type <= SADB_EXT_MAX) { | |
479 | int min = (int) sadb_ext_min_len[ext_type]; | |
480 | if (ext_len < min) | |
481 | return -EINVAL; | |
482 | if (ext_hdrs[ext_type-1] != NULL) | |
483 | return -EINVAL; | |
484 | if (ext_type == SADB_EXT_ADDRESS_SRC || | |
485 | ext_type == SADB_EXT_ADDRESS_DST || | |
486 | ext_type == SADB_EXT_ADDRESS_PROXY || | |
487 | ext_type == SADB_X_EXT_NAT_T_OA) { | |
488 | if (verify_address_len(p)) | |
489 | return -EINVAL; | |
490 | } | |
df71837d TJ |
491 | if (ext_type == SADB_X_EXT_SEC_CTX) { |
492 | if (verify_sec_ctx_len(p)) | |
493 | return -EINVAL; | |
494 | } | |
1da177e4 LT |
495 | ext_hdrs[ext_type-1] = p; |
496 | } | |
497 | p += ext_len; | |
498 | len -= ext_len; | |
499 | } | |
500 | ||
501 | return 0; | |
502 | } | |
503 | ||
504 | static uint16_t | |
505 | pfkey_satype2proto(uint8_t satype) | |
506 | { | |
507 | switch (satype) { | |
508 | case SADB_SATYPE_UNSPEC: | |
509 | return IPSEC_PROTO_ANY; | |
510 | case SADB_SATYPE_AH: | |
511 | return IPPROTO_AH; | |
512 | case SADB_SATYPE_ESP: | |
513 | return IPPROTO_ESP; | |
514 | case SADB_X_SATYPE_IPCOMP: | |
515 | return IPPROTO_COMP; | |
516 | break; | |
517 | default: | |
518 | return 0; | |
519 | } | |
520 | /* NOTREACHED */ | |
521 | } | |
522 | ||
523 | static uint8_t | |
524 | pfkey_proto2satype(uint16_t proto) | |
525 | { | |
526 | switch (proto) { | |
527 | case IPPROTO_AH: | |
528 | return SADB_SATYPE_AH; | |
529 | case IPPROTO_ESP: | |
530 | return SADB_SATYPE_ESP; | |
531 | case IPPROTO_COMP: | |
532 | return SADB_X_SATYPE_IPCOMP; | |
533 | break; | |
534 | default: | |
535 | return 0; | |
536 | } | |
537 | /* NOTREACHED */ | |
538 | } | |
539 | ||
540 | /* BTW, this scheme means that there is no way with PFKEY2 sockets to | |
541 | * say specifically 'just raw sockets' as we encode them as 255. | |
542 | */ | |
543 | ||
544 | static uint8_t pfkey_proto_to_xfrm(uint8_t proto) | |
545 | { | |
546 | return (proto == IPSEC_PROTO_ANY ? 0 : proto); | |
547 | } | |
548 | ||
549 | static uint8_t pfkey_proto_from_xfrm(uint8_t proto) | |
550 | { | |
551 | return (proto ? proto : IPSEC_PROTO_ANY); | |
552 | } | |
553 | ||
554 | static int pfkey_sadb_addr2xfrm_addr(struct sadb_address *addr, | |
555 | xfrm_address_t *xaddr) | |
556 | { | |
557 | switch (((struct sockaddr*)(addr + 1))->sa_family) { | |
558 | case AF_INET: | |
559 | xaddr->a4 = | |
560 | ((struct sockaddr_in *)(addr + 1))->sin_addr.s_addr; | |
561 | return AF_INET; | |
562 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
563 | case AF_INET6: | |
564 | memcpy(xaddr->a6, | |
565 | &((struct sockaddr_in6 *)(addr + 1))->sin6_addr, | |
566 | sizeof(struct in6_addr)); | |
567 | return AF_INET6; | |
568 | #endif | |
569 | default: | |
570 | return 0; | |
571 | } | |
572 | /* NOTREACHED */ | |
573 | } | |
574 | ||
575 | static struct xfrm_state *pfkey_xfrm_state_lookup(struct sadb_msg *hdr, void **ext_hdrs) | |
576 | { | |
577 | struct sadb_sa *sa; | |
578 | struct sadb_address *addr; | |
579 | uint16_t proto; | |
580 | unsigned short family; | |
581 | xfrm_address_t *xaddr; | |
582 | ||
583 | sa = (struct sadb_sa *) ext_hdrs[SADB_EXT_SA-1]; | |
584 | if (sa == NULL) | |
585 | return NULL; | |
586 | ||
587 | proto = pfkey_satype2proto(hdr->sadb_msg_satype); | |
588 | if (proto == 0) | |
589 | return NULL; | |
590 | ||
591 | /* sadb_address_len should be checked by caller */ | |
592 | addr = (struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1]; | |
593 | if (addr == NULL) | |
594 | return NULL; | |
595 | ||
596 | family = ((struct sockaddr *)(addr + 1))->sa_family; | |
597 | switch (family) { | |
598 | case AF_INET: | |
599 | xaddr = (xfrm_address_t *)&((struct sockaddr_in *)(addr + 1))->sin_addr; | |
600 | break; | |
601 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
602 | case AF_INET6: | |
603 | xaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(addr + 1))->sin6_addr; | |
604 | break; | |
605 | #endif | |
606 | default: | |
607 | xaddr = NULL; | |
608 | } | |
609 | ||
610 | if (!xaddr) | |
611 | return NULL; | |
612 | ||
613 | return xfrm_state_lookup(xaddr, sa->sadb_sa_spi, proto, family); | |
614 | } | |
615 | ||
616 | #define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1))) | |
617 | static int | |
618 | pfkey_sockaddr_size(sa_family_t family) | |
619 | { | |
620 | switch (family) { | |
621 | case AF_INET: | |
622 | return PFKEY_ALIGN8(sizeof(struct sockaddr_in)); | |
623 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
624 | case AF_INET6: | |
625 | return PFKEY_ALIGN8(sizeof(struct sockaddr_in6)); | |
626 | #endif | |
627 | default: | |
628 | return 0; | |
629 | } | |
630 | /* NOTREACHED */ | |
631 | } | |
632 | ||
633 | static struct sk_buff * pfkey_xfrm_state2msg(struct xfrm_state *x, int add_keys, int hsc) | |
634 | { | |
635 | struct sk_buff *skb; | |
636 | struct sadb_msg *hdr; | |
637 | struct sadb_sa *sa; | |
638 | struct sadb_lifetime *lifetime; | |
639 | struct sadb_address *addr; | |
640 | struct sadb_key *key; | |
641 | struct sadb_x_sa2 *sa2; | |
642 | struct sockaddr_in *sin; | |
df71837d TJ |
643 | struct sadb_x_sec_ctx *sec_ctx; |
644 | struct xfrm_sec_ctx *xfrm_ctx; | |
645 | int ctx_size = 0; | |
1da177e4 LT |
646 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
647 | struct sockaddr_in6 *sin6; | |
648 | #endif | |
649 | int size; | |
650 | int auth_key_size = 0; | |
651 | int encrypt_key_size = 0; | |
652 | int sockaddr_size; | |
653 | struct xfrm_encap_tmpl *natt = NULL; | |
654 | ||
655 | /* address family check */ | |
656 | sockaddr_size = pfkey_sockaddr_size(x->props.family); | |
657 | if (!sockaddr_size) | |
658 | return ERR_PTR(-EINVAL); | |
659 | ||
660 | /* base, SA, (lifetime (HSC),) address(SD), (address(P),) | |
661 | key(AE), (identity(SD),) (sensitivity)> */ | |
662 | size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) + | |
663 | sizeof(struct sadb_lifetime) + | |
664 | ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) + | |
665 | ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) + | |
666 | sizeof(struct sadb_address)*2 + | |
667 | sockaddr_size*2 + | |
668 | sizeof(struct sadb_x_sa2); | |
df71837d TJ |
669 | |
670 | if ((xfrm_ctx = x->security)) { | |
671 | ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len); | |
672 | size += sizeof(struct sadb_x_sec_ctx) + ctx_size; | |
673 | } | |
674 | ||
1da177e4 LT |
675 | /* identity & sensitivity */ |
676 | ||
677 | if ((x->props.family == AF_INET && | |
678 | x->sel.saddr.a4 != x->props.saddr.a4) | |
679 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
680 | || (x->props.family == AF_INET6 && | |
681 | memcmp (x->sel.saddr.a6, x->props.saddr.a6, sizeof (struct in6_addr))) | |
682 | #endif | |
683 | ) | |
684 | size += sizeof(struct sadb_address) + sockaddr_size; | |
685 | ||
686 | if (add_keys) { | |
687 | if (x->aalg && x->aalg->alg_key_len) { | |
688 | auth_key_size = | |
689 | PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8); | |
690 | size += sizeof(struct sadb_key) + auth_key_size; | |
691 | } | |
692 | if (x->ealg && x->ealg->alg_key_len) { | |
693 | encrypt_key_size = | |
694 | PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8); | |
695 | size += sizeof(struct sadb_key) + encrypt_key_size; | |
696 | } | |
697 | } | |
698 | if (x->encap) | |
699 | natt = x->encap; | |
700 | ||
701 | if (natt && natt->encap_type) { | |
702 | size += sizeof(struct sadb_x_nat_t_type); | |
703 | size += sizeof(struct sadb_x_nat_t_port); | |
704 | size += sizeof(struct sadb_x_nat_t_port); | |
705 | } | |
706 | ||
707 | skb = alloc_skb(size + 16, GFP_ATOMIC); | |
708 | if (skb == NULL) | |
709 | return ERR_PTR(-ENOBUFS); | |
710 | ||
711 | /* call should fill header later */ | |
712 | hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); | |
713 | memset(hdr, 0, size); /* XXX do we need this ? */ | |
714 | hdr->sadb_msg_len = size / sizeof(uint64_t); | |
715 | ||
716 | /* sa */ | |
717 | sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa)); | |
718 | sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t); | |
719 | sa->sadb_sa_exttype = SADB_EXT_SA; | |
720 | sa->sadb_sa_spi = x->id.spi; | |
721 | sa->sadb_sa_replay = x->props.replay_window; | |
4f09f0bb HX |
722 | switch (x->km.state) { |
723 | case XFRM_STATE_VALID: | |
724 | sa->sadb_sa_state = x->km.dying ? | |
725 | SADB_SASTATE_DYING : SADB_SASTATE_MATURE; | |
726 | break; | |
727 | case XFRM_STATE_ACQ: | |
1da177e4 | 728 | sa->sadb_sa_state = SADB_SASTATE_LARVAL; |
4f09f0bb HX |
729 | break; |
730 | default: | |
1da177e4 | 731 | sa->sadb_sa_state = SADB_SASTATE_DEAD; |
4f09f0bb HX |
732 | break; |
733 | } | |
1da177e4 LT |
734 | sa->sadb_sa_auth = 0; |
735 | if (x->aalg) { | |
736 | struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0); | |
737 | sa->sadb_sa_auth = a ? a->desc.sadb_alg_id : 0; | |
738 | } | |
739 | sa->sadb_sa_encrypt = 0; | |
740 | BUG_ON(x->ealg && x->calg); | |
741 | if (x->ealg) { | |
742 | struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0); | |
743 | sa->sadb_sa_encrypt = a ? a->desc.sadb_alg_id : 0; | |
744 | } | |
745 | /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */ | |
746 | if (x->calg) { | |
747 | struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0); | |
748 | sa->sadb_sa_encrypt = a ? a->desc.sadb_alg_id : 0; | |
749 | } | |
750 | ||
751 | sa->sadb_sa_flags = 0; | |
752 | if (x->props.flags & XFRM_STATE_NOECN) | |
753 | sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN; | |
754 | if (x->props.flags & XFRM_STATE_DECAP_DSCP) | |
755 | sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP; | |
dd87147e HX |
756 | if (x->props.flags & XFRM_STATE_NOPMTUDISC) |
757 | sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC; | |
1da177e4 LT |
758 | |
759 | /* hard time */ | |
760 | if (hsc & 2) { | |
761 | lifetime = (struct sadb_lifetime *) skb_put(skb, | |
762 | sizeof(struct sadb_lifetime)); | |
763 | lifetime->sadb_lifetime_len = | |
764 | sizeof(struct sadb_lifetime)/sizeof(uint64_t); | |
765 | lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD; | |
766 | lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.hard_packet_limit); | |
767 | lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit); | |
768 | lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds; | |
769 | lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds; | |
770 | } | |
771 | /* soft time */ | |
772 | if (hsc & 1) { | |
773 | lifetime = (struct sadb_lifetime *) skb_put(skb, | |
774 | sizeof(struct sadb_lifetime)); | |
775 | lifetime->sadb_lifetime_len = | |
776 | sizeof(struct sadb_lifetime)/sizeof(uint64_t); | |
777 | lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT; | |
778 | lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.soft_packet_limit); | |
779 | lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit); | |
780 | lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds; | |
781 | lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds; | |
782 | } | |
783 | /* current time */ | |
784 | lifetime = (struct sadb_lifetime *) skb_put(skb, | |
785 | sizeof(struct sadb_lifetime)); | |
786 | lifetime->sadb_lifetime_len = | |
787 | sizeof(struct sadb_lifetime)/sizeof(uint64_t); | |
788 | lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; | |
789 | lifetime->sadb_lifetime_allocations = x->curlft.packets; | |
790 | lifetime->sadb_lifetime_bytes = x->curlft.bytes; | |
791 | lifetime->sadb_lifetime_addtime = x->curlft.add_time; | |
792 | lifetime->sadb_lifetime_usetime = x->curlft.use_time; | |
793 | /* src address */ | |
794 | addr = (struct sadb_address*) skb_put(skb, | |
795 | sizeof(struct sadb_address)+sockaddr_size); | |
796 | addr->sadb_address_len = | |
797 | (sizeof(struct sadb_address)+sockaddr_size)/ | |
798 | sizeof(uint64_t); | |
799 | addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; | |
800 | /* "if the ports are non-zero, then the sadb_address_proto field, | |
801 | normally zero, MUST be filled in with the transport | |
802 | protocol's number." - RFC2367 */ | |
803 | addr->sadb_address_proto = 0; | |
804 | addr->sadb_address_reserved = 0; | |
805 | if (x->props.family == AF_INET) { | |
806 | addr->sadb_address_prefixlen = 32; | |
807 | ||
808 | sin = (struct sockaddr_in *) (addr + 1); | |
809 | sin->sin_family = AF_INET; | |
810 | sin->sin_addr.s_addr = x->props.saddr.a4; | |
811 | sin->sin_port = 0; | |
812 | memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
813 | } | |
814 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
815 | else if (x->props.family == AF_INET6) { | |
816 | addr->sadb_address_prefixlen = 128; | |
817 | ||
818 | sin6 = (struct sockaddr_in6 *) (addr + 1); | |
819 | sin6->sin6_family = AF_INET6; | |
820 | sin6->sin6_port = 0; | |
821 | sin6->sin6_flowinfo = 0; | |
822 | memcpy(&sin6->sin6_addr, x->props.saddr.a6, | |
823 | sizeof(struct in6_addr)); | |
824 | sin6->sin6_scope_id = 0; | |
825 | } | |
826 | #endif | |
827 | else | |
828 | BUG(); | |
829 | ||
830 | /* dst address */ | |
831 | addr = (struct sadb_address*) skb_put(skb, | |
832 | sizeof(struct sadb_address)+sockaddr_size); | |
833 | addr->sadb_address_len = | |
834 | (sizeof(struct sadb_address)+sockaddr_size)/ | |
835 | sizeof(uint64_t); | |
836 | addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; | |
837 | addr->sadb_address_proto = 0; | |
838 | addr->sadb_address_prefixlen = 32; /* XXX */ | |
839 | addr->sadb_address_reserved = 0; | |
840 | if (x->props.family == AF_INET) { | |
841 | sin = (struct sockaddr_in *) (addr + 1); | |
842 | sin->sin_family = AF_INET; | |
843 | sin->sin_addr.s_addr = x->id.daddr.a4; | |
844 | sin->sin_port = 0; | |
845 | memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
846 | ||
847 | if (x->sel.saddr.a4 != x->props.saddr.a4) { | |
848 | addr = (struct sadb_address*) skb_put(skb, | |
849 | sizeof(struct sadb_address)+sockaddr_size); | |
850 | addr->sadb_address_len = | |
851 | (sizeof(struct sadb_address)+sockaddr_size)/ | |
852 | sizeof(uint64_t); | |
853 | addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY; | |
854 | addr->sadb_address_proto = | |
855 | pfkey_proto_from_xfrm(x->sel.proto); | |
856 | addr->sadb_address_prefixlen = x->sel.prefixlen_s; | |
857 | addr->sadb_address_reserved = 0; | |
858 | ||
859 | sin = (struct sockaddr_in *) (addr + 1); | |
860 | sin->sin_family = AF_INET; | |
861 | sin->sin_addr.s_addr = x->sel.saddr.a4; | |
862 | sin->sin_port = x->sel.sport; | |
863 | memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
864 | } | |
865 | } | |
866 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
867 | else if (x->props.family == AF_INET6) { | |
868 | addr->sadb_address_prefixlen = 128; | |
869 | ||
870 | sin6 = (struct sockaddr_in6 *) (addr + 1); | |
871 | sin6->sin6_family = AF_INET6; | |
872 | sin6->sin6_port = 0; | |
873 | sin6->sin6_flowinfo = 0; | |
874 | memcpy(&sin6->sin6_addr, x->id.daddr.a6, sizeof(struct in6_addr)); | |
875 | sin6->sin6_scope_id = 0; | |
876 | ||
877 | if (memcmp (x->sel.saddr.a6, x->props.saddr.a6, | |
878 | sizeof(struct in6_addr))) { | |
879 | addr = (struct sadb_address *) skb_put(skb, | |
880 | sizeof(struct sadb_address)+sockaddr_size); | |
881 | addr->sadb_address_len = | |
882 | (sizeof(struct sadb_address)+sockaddr_size)/ | |
883 | sizeof(uint64_t); | |
884 | addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY; | |
885 | addr->sadb_address_proto = | |
886 | pfkey_proto_from_xfrm(x->sel.proto); | |
887 | addr->sadb_address_prefixlen = x->sel.prefixlen_s; | |
888 | addr->sadb_address_reserved = 0; | |
889 | ||
890 | sin6 = (struct sockaddr_in6 *) (addr + 1); | |
891 | sin6->sin6_family = AF_INET6; | |
892 | sin6->sin6_port = x->sel.sport; | |
893 | sin6->sin6_flowinfo = 0; | |
894 | memcpy(&sin6->sin6_addr, x->sel.saddr.a6, | |
895 | sizeof(struct in6_addr)); | |
896 | sin6->sin6_scope_id = 0; | |
897 | } | |
898 | } | |
899 | #endif | |
900 | else | |
901 | BUG(); | |
902 | ||
903 | /* auth key */ | |
904 | if (add_keys && auth_key_size) { | |
905 | key = (struct sadb_key *) skb_put(skb, | |
906 | sizeof(struct sadb_key)+auth_key_size); | |
907 | key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) / | |
908 | sizeof(uint64_t); | |
909 | key->sadb_key_exttype = SADB_EXT_KEY_AUTH; | |
910 | key->sadb_key_bits = x->aalg->alg_key_len; | |
911 | key->sadb_key_reserved = 0; | |
912 | memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8); | |
913 | } | |
914 | /* encrypt key */ | |
915 | if (add_keys && encrypt_key_size) { | |
916 | key = (struct sadb_key *) skb_put(skb, | |
917 | sizeof(struct sadb_key)+encrypt_key_size); | |
918 | key->sadb_key_len = (sizeof(struct sadb_key) + | |
919 | encrypt_key_size) / sizeof(uint64_t); | |
920 | key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT; | |
921 | key->sadb_key_bits = x->ealg->alg_key_len; | |
922 | key->sadb_key_reserved = 0; | |
923 | memcpy(key + 1, x->ealg->alg_key, | |
924 | (x->ealg->alg_key_len+7)/8); | |
925 | } | |
926 | ||
927 | /* sa */ | |
928 | sa2 = (struct sadb_x_sa2 *) skb_put(skb, sizeof(struct sadb_x_sa2)); | |
929 | sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t); | |
930 | sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2; | |
931 | sa2->sadb_x_sa2_mode = x->props.mode + 1; | |
932 | sa2->sadb_x_sa2_reserved1 = 0; | |
933 | sa2->sadb_x_sa2_reserved2 = 0; | |
934 | sa2->sadb_x_sa2_sequence = 0; | |
935 | sa2->sadb_x_sa2_reqid = x->props.reqid; | |
936 | ||
937 | if (natt && natt->encap_type) { | |
938 | struct sadb_x_nat_t_type *n_type; | |
939 | struct sadb_x_nat_t_port *n_port; | |
940 | ||
941 | /* type */ | |
942 | n_type = (struct sadb_x_nat_t_type*) skb_put(skb, sizeof(*n_type)); | |
943 | n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t); | |
944 | n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE; | |
945 | n_type->sadb_x_nat_t_type_type = natt->encap_type; | |
946 | n_type->sadb_x_nat_t_type_reserved[0] = 0; | |
947 | n_type->sadb_x_nat_t_type_reserved[1] = 0; | |
948 | n_type->sadb_x_nat_t_type_reserved[2] = 0; | |
949 | ||
950 | /* source port */ | |
951 | n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port)); | |
952 | n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); | |
953 | n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT; | |
954 | n_port->sadb_x_nat_t_port_port = natt->encap_sport; | |
955 | n_port->sadb_x_nat_t_port_reserved = 0; | |
956 | ||
957 | /* dest port */ | |
958 | n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port)); | |
959 | n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); | |
960 | n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT; | |
961 | n_port->sadb_x_nat_t_port_port = natt->encap_dport; | |
962 | n_port->sadb_x_nat_t_port_reserved = 0; | |
963 | } | |
964 | ||
df71837d TJ |
965 | /* security context */ |
966 | if (xfrm_ctx) { | |
967 | sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, | |
968 | sizeof(struct sadb_x_sec_ctx) + ctx_size); | |
969 | sec_ctx->sadb_x_sec_len = | |
970 | (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t); | |
971 | sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX; | |
972 | sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi; | |
973 | sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg; | |
974 | sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len; | |
975 | memcpy(sec_ctx + 1, xfrm_ctx->ctx_str, | |
976 | xfrm_ctx->ctx_len); | |
977 | } | |
978 | ||
1da177e4 LT |
979 | return skb; |
980 | } | |
981 | ||
982 | static struct xfrm_state * pfkey_msg2xfrm_state(struct sadb_msg *hdr, | |
983 | void **ext_hdrs) | |
984 | { | |
985 | struct xfrm_state *x; | |
986 | struct sadb_lifetime *lifetime; | |
987 | struct sadb_sa *sa; | |
988 | struct sadb_key *key; | |
df71837d | 989 | struct sadb_x_sec_ctx *sec_ctx; |
1da177e4 LT |
990 | uint16_t proto; |
991 | int err; | |
992 | ||
993 | ||
994 | sa = (struct sadb_sa *) ext_hdrs[SADB_EXT_SA-1]; | |
995 | if (!sa || | |
996 | !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], | |
997 | ext_hdrs[SADB_EXT_ADDRESS_DST-1])) | |
998 | return ERR_PTR(-EINVAL); | |
999 | if (hdr->sadb_msg_satype == SADB_SATYPE_ESP && | |
1000 | !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1]) | |
1001 | return ERR_PTR(-EINVAL); | |
1002 | if (hdr->sadb_msg_satype == SADB_SATYPE_AH && | |
1003 | !ext_hdrs[SADB_EXT_KEY_AUTH-1]) | |
1004 | return ERR_PTR(-EINVAL); | |
1005 | if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] != | |
1006 | !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) | |
1007 | return ERR_PTR(-EINVAL); | |
1008 | ||
1009 | proto = pfkey_satype2proto(hdr->sadb_msg_satype); | |
1010 | if (proto == 0) | |
1011 | return ERR_PTR(-EINVAL); | |
1012 | ||
1013 | /* default error is no buffer space */ | |
1014 | err = -ENOBUFS; | |
1015 | ||
1016 | /* RFC2367: | |
1017 | ||
1018 | Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message. | |
1019 | SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not | |
1020 | sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state. | |
1021 | Therefore, the sadb_sa_state field of all submitted SAs MUST be | |
1022 | SADB_SASTATE_MATURE and the kernel MUST return an error if this is | |
1023 | not true. | |
1024 | ||
1025 | However, KAME setkey always uses SADB_SASTATE_LARVAL. | |
1026 | Hence, we have to _ignore_ sadb_sa_state, which is also reasonable. | |
1027 | */ | |
1028 | if (sa->sadb_sa_auth > SADB_AALG_MAX || | |
1029 | (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP && | |
1030 | sa->sadb_sa_encrypt > SADB_X_CALG_MAX) || | |
1031 | sa->sadb_sa_encrypt > SADB_EALG_MAX) | |
1032 | return ERR_PTR(-EINVAL); | |
1033 | key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_AUTH-1]; | |
1034 | if (key != NULL && | |
1035 | sa->sadb_sa_auth != SADB_X_AALG_NULL && | |
1036 | ((key->sadb_key_bits+7) / 8 == 0 || | |
1037 | (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t))) | |
1038 | return ERR_PTR(-EINVAL); | |
1039 | key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1]; | |
1040 | if (key != NULL && | |
1041 | sa->sadb_sa_encrypt != SADB_EALG_NULL && | |
1042 | ((key->sadb_key_bits+7) / 8 == 0 || | |
1043 | (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t))) | |
1044 | return ERR_PTR(-EINVAL); | |
1045 | ||
1046 | x = xfrm_state_alloc(); | |
1047 | if (x == NULL) | |
1048 | return ERR_PTR(-ENOBUFS); | |
1049 | ||
1050 | x->id.proto = proto; | |
1051 | x->id.spi = sa->sadb_sa_spi; | |
1052 | x->props.replay_window = sa->sadb_sa_replay; | |
1053 | if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN) | |
1054 | x->props.flags |= XFRM_STATE_NOECN; | |
1055 | if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP) | |
1056 | x->props.flags |= XFRM_STATE_DECAP_DSCP; | |
dd87147e HX |
1057 | if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC) |
1058 | x->props.flags |= XFRM_STATE_NOPMTUDISC; | |
1da177e4 LT |
1059 | |
1060 | lifetime = (struct sadb_lifetime*) ext_hdrs[SADB_EXT_LIFETIME_HARD-1]; | |
1061 | if (lifetime != NULL) { | |
1062 | x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); | |
1063 | x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); | |
1064 | x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime; | |
1065 | x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime; | |
1066 | } | |
1067 | lifetime = (struct sadb_lifetime*) ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]; | |
1068 | if (lifetime != NULL) { | |
1069 | x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); | |
1070 | x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); | |
1071 | x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime; | |
1072 | x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime; | |
1073 | } | |
df71837d TJ |
1074 | |
1075 | sec_ctx = (struct sadb_x_sec_ctx *) ext_hdrs[SADB_X_EXT_SEC_CTX-1]; | |
1076 | if (sec_ctx != NULL) { | |
1077 | struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx); | |
1078 | ||
1079 | if (!uctx) | |
1080 | goto out; | |
1081 | ||
1082 | err = security_xfrm_state_alloc(x, uctx); | |
1083 | kfree(uctx); | |
1084 | ||
1085 | if (err) | |
1086 | goto out; | |
1087 | } | |
1088 | ||
1da177e4 LT |
1089 | key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_AUTH-1]; |
1090 | if (sa->sadb_sa_auth) { | |
1091 | int keysize = 0; | |
1092 | struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth); | |
1093 | if (!a) { | |
1094 | err = -ENOSYS; | |
1095 | goto out; | |
1096 | } | |
1097 | if (key) | |
1098 | keysize = (key->sadb_key_bits + 7) / 8; | |
1099 | x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL); | |
1100 | if (!x->aalg) | |
1101 | goto out; | |
1102 | strcpy(x->aalg->alg_name, a->name); | |
1103 | x->aalg->alg_key_len = 0; | |
1104 | if (key) { | |
1105 | x->aalg->alg_key_len = key->sadb_key_bits; | |
1106 | memcpy(x->aalg->alg_key, key+1, keysize); | |
1107 | } | |
1108 | x->props.aalgo = sa->sadb_sa_auth; | |
1109 | /* x->algo.flags = sa->sadb_sa_flags; */ | |
1110 | } | |
1111 | if (sa->sadb_sa_encrypt) { | |
1112 | if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) { | |
1113 | struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt); | |
1114 | if (!a) { | |
1115 | err = -ENOSYS; | |
1116 | goto out; | |
1117 | } | |
1118 | x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL); | |
1119 | if (!x->calg) | |
1120 | goto out; | |
1121 | strcpy(x->calg->alg_name, a->name); | |
1122 | x->props.calgo = sa->sadb_sa_encrypt; | |
1123 | } else { | |
1124 | int keysize = 0; | |
1125 | struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt); | |
1126 | if (!a) { | |
1127 | err = -ENOSYS; | |
1128 | goto out; | |
1129 | } | |
1130 | key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1]; | |
1131 | if (key) | |
1132 | keysize = (key->sadb_key_bits + 7) / 8; | |
1133 | x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL); | |
1134 | if (!x->ealg) | |
1135 | goto out; | |
1136 | strcpy(x->ealg->alg_name, a->name); | |
1137 | x->ealg->alg_key_len = 0; | |
1138 | if (key) { | |
1139 | x->ealg->alg_key_len = key->sadb_key_bits; | |
1140 | memcpy(x->ealg->alg_key, key+1, keysize); | |
1141 | } | |
1142 | x->props.ealgo = sa->sadb_sa_encrypt; | |
1143 | } | |
1144 | } | |
1145 | /* x->algo.flags = sa->sadb_sa_flags; */ | |
1146 | ||
1147 | x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1], | |
1148 | &x->props.saddr); | |
1149 | if (!x->props.family) { | |
1150 | err = -EAFNOSUPPORT; | |
1151 | goto out; | |
1152 | } | |
1153 | pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1], | |
1154 | &x->id.daddr); | |
1155 | ||
1156 | if (ext_hdrs[SADB_X_EXT_SA2-1]) { | |
1157 | struct sadb_x_sa2 *sa2 = (void*)ext_hdrs[SADB_X_EXT_SA2-1]; | |
1158 | x->props.mode = sa2->sadb_x_sa2_mode; | |
1159 | if (x->props.mode) | |
1160 | x->props.mode--; | |
1161 | x->props.reqid = sa2->sadb_x_sa2_reqid; | |
1162 | } | |
1163 | ||
1164 | if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) { | |
1165 | struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]; | |
1166 | ||
1167 | /* Nobody uses this, but we try. */ | |
1168 | x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr); | |
1169 | x->sel.prefixlen_s = addr->sadb_address_prefixlen; | |
1170 | } | |
1171 | ||
1172 | if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) { | |
1173 | struct sadb_x_nat_t_type* n_type; | |
1174 | struct xfrm_encap_tmpl *natt; | |
1175 | ||
1176 | x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL); | |
1177 | if (!x->encap) | |
1178 | goto out; | |
1179 | ||
1180 | natt = x->encap; | |
1181 | n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]; | |
1182 | natt->encap_type = n_type->sadb_x_nat_t_type_type; | |
1183 | ||
1184 | if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) { | |
1185 | struct sadb_x_nat_t_port* n_port = | |
1186 | ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]; | |
1187 | natt->encap_sport = n_port->sadb_x_nat_t_port_port; | |
1188 | } | |
1189 | if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) { | |
1190 | struct sadb_x_nat_t_port* n_port = | |
1191 | ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]; | |
1192 | natt->encap_dport = n_port->sadb_x_nat_t_port_port; | |
1193 | } | |
1194 | } | |
1195 | ||
72cb6962 HX |
1196 | err = xfrm_init_state(x); |
1197 | if (err) | |
1da177e4 | 1198 | goto out; |
72cb6962 | 1199 | |
1da177e4 | 1200 | x->km.seq = hdr->sadb_msg_seq; |
1da177e4 LT |
1201 | return x; |
1202 | ||
1203 | out: | |
1204 | x->km.state = XFRM_STATE_DEAD; | |
1205 | xfrm_state_put(x); | |
1206 | return ERR_PTR(err); | |
1207 | } | |
1208 | ||
1209 | static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) | |
1210 | { | |
1211 | return -EOPNOTSUPP; | |
1212 | } | |
1213 | ||
1214 | static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) | |
1215 | { | |
1216 | struct sk_buff *resp_skb; | |
1217 | struct sadb_x_sa2 *sa2; | |
1218 | struct sadb_address *saddr, *daddr; | |
1219 | struct sadb_msg *out_hdr; | |
1220 | struct xfrm_state *x = NULL; | |
1221 | u8 mode; | |
1222 | u32 reqid; | |
1223 | u8 proto; | |
1224 | unsigned short family; | |
1225 | xfrm_address_t *xsaddr = NULL, *xdaddr = NULL; | |
1226 | ||
1227 | if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], | |
1228 | ext_hdrs[SADB_EXT_ADDRESS_DST-1])) | |
1229 | return -EINVAL; | |
1230 | ||
1231 | proto = pfkey_satype2proto(hdr->sadb_msg_satype); | |
1232 | if (proto == 0) | |
1233 | return -EINVAL; | |
1234 | ||
1235 | if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) { | |
1236 | mode = sa2->sadb_x_sa2_mode - 1; | |
1237 | reqid = sa2->sadb_x_sa2_reqid; | |
1238 | } else { | |
1239 | mode = 0; | |
1240 | reqid = 0; | |
1241 | } | |
1242 | ||
1243 | saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1]; | |
1244 | daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1]; | |
1245 | ||
1246 | family = ((struct sockaddr *)(saddr + 1))->sa_family; | |
1247 | switch (family) { | |
1248 | case AF_INET: | |
1249 | xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr; | |
1250 | xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr; | |
1251 | break; | |
1252 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
1253 | case AF_INET6: | |
1254 | xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr; | |
1255 | xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr; | |
1256 | break; | |
1257 | #endif | |
1258 | } | |
1259 | ||
1260 | if (hdr->sadb_msg_seq) { | |
1261 | x = xfrm_find_acq_byseq(hdr->sadb_msg_seq); | |
1262 | if (x && xfrm_addr_cmp(&x->id.daddr, xdaddr, family)) { | |
1263 | xfrm_state_put(x); | |
1264 | x = NULL; | |
1265 | } | |
1266 | } | |
1267 | ||
1268 | if (!x) | |
1269 | x = xfrm_find_acq(mode, reqid, proto, xdaddr, xsaddr, 1, family); | |
1270 | ||
1271 | if (x == NULL) | |
1272 | return -ENOENT; | |
1273 | ||
1274 | resp_skb = ERR_PTR(-ENOENT); | |
1275 | ||
1276 | spin_lock_bh(&x->lock); | |
1277 | if (x->km.state != XFRM_STATE_DEAD) { | |
1278 | struct sadb_spirange *range = ext_hdrs[SADB_EXT_SPIRANGE-1]; | |
1279 | u32 min_spi, max_spi; | |
1280 | ||
1281 | if (range != NULL) { | |
1282 | min_spi = range->sadb_spirange_min; | |
1283 | max_spi = range->sadb_spirange_max; | |
1284 | } else { | |
1285 | min_spi = 0x100; | |
1286 | max_spi = 0x0fffffff; | |
1287 | } | |
1288 | xfrm_alloc_spi(x, htonl(min_spi), htonl(max_spi)); | |
1289 | if (x->id.spi) | |
1290 | resp_skb = pfkey_xfrm_state2msg(x, 0, 3); | |
1291 | } | |
1292 | spin_unlock_bh(&x->lock); | |
1293 | ||
1294 | if (IS_ERR(resp_skb)) { | |
1295 | xfrm_state_put(x); | |
1296 | return PTR_ERR(resp_skb); | |
1297 | } | |
1298 | ||
1299 | out_hdr = (struct sadb_msg *) resp_skb->data; | |
1300 | out_hdr->sadb_msg_version = hdr->sadb_msg_version; | |
1301 | out_hdr->sadb_msg_type = SADB_GETSPI; | |
1302 | out_hdr->sadb_msg_satype = pfkey_proto2satype(proto); | |
1303 | out_hdr->sadb_msg_errno = 0; | |
1304 | out_hdr->sadb_msg_reserved = 0; | |
1305 | out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; | |
1306 | out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; | |
1307 | ||
1308 | xfrm_state_put(x); | |
1309 | ||
1310 | pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk); | |
1311 | ||
1312 | return 0; | |
1313 | } | |
1314 | ||
1315 | static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) | |
1316 | { | |
1317 | struct xfrm_state *x; | |
1318 | ||
1319 | if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8) | |
1320 | return -EOPNOTSUPP; | |
1321 | ||
1322 | if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0) | |
1323 | return 0; | |
1324 | ||
1325 | x = xfrm_find_acq_byseq(hdr->sadb_msg_seq); | |
1326 | if (x == NULL) | |
1327 | return 0; | |
1328 | ||
1329 | spin_lock_bh(&x->lock); | |
1330 | if (x->km.state == XFRM_STATE_ACQ) { | |
1331 | x->km.state = XFRM_STATE_ERROR; | |
1332 | wake_up(&km_waitq); | |
1333 | } | |
1334 | spin_unlock_bh(&x->lock); | |
1335 | xfrm_state_put(x); | |
1336 | return 0; | |
1337 | } | |
1338 | ||
26b15dad JHS |
1339 | static inline int event2poltype(int event) |
1340 | { | |
1341 | switch (event) { | |
f60f6b8f | 1342 | case XFRM_MSG_DELPOLICY: |
26b15dad | 1343 | return SADB_X_SPDDELETE; |
f60f6b8f | 1344 | case XFRM_MSG_NEWPOLICY: |
26b15dad | 1345 | return SADB_X_SPDADD; |
f60f6b8f | 1346 | case XFRM_MSG_UPDPOLICY: |
26b15dad | 1347 | return SADB_X_SPDUPDATE; |
f60f6b8f | 1348 | case XFRM_MSG_POLEXPIRE: |
26b15dad JHS |
1349 | // return SADB_X_SPDEXPIRE; |
1350 | default: | |
1351 | printk("pfkey: Unknown policy event %d\n", event); | |
1352 | break; | |
1353 | } | |
1354 | ||
1355 | return 0; | |
1356 | } | |
1357 | ||
1358 | static inline int event2keytype(int event) | |
1359 | { | |
1360 | switch (event) { | |
f60f6b8f | 1361 | case XFRM_MSG_DELSA: |
26b15dad | 1362 | return SADB_DELETE; |
f60f6b8f | 1363 | case XFRM_MSG_NEWSA: |
26b15dad | 1364 | return SADB_ADD; |
f60f6b8f | 1365 | case XFRM_MSG_UPDSA: |
26b15dad | 1366 | return SADB_UPDATE; |
f60f6b8f | 1367 | case XFRM_MSG_EXPIRE: |
26b15dad JHS |
1368 | return SADB_EXPIRE; |
1369 | default: | |
1370 | printk("pfkey: Unknown SA event %d\n", event); | |
1371 | break; | |
1372 | } | |
1373 | ||
1374 | return 0; | |
1375 | } | |
1376 | ||
1377 | /* ADD/UPD/DEL */ | |
1378 | static int key_notify_sa(struct xfrm_state *x, struct km_event *c) | |
1379 | { | |
1380 | struct sk_buff *skb; | |
1381 | struct sadb_msg *hdr; | |
1382 | int hsc = 3; | |
1383 | ||
f60f6b8f | 1384 | if (c->event == XFRM_MSG_DELSA) |
26b15dad JHS |
1385 | hsc = 0; |
1386 | ||
26b15dad JHS |
1387 | skb = pfkey_xfrm_state2msg(x, 0, hsc); |
1388 | ||
1389 | if (IS_ERR(skb)) | |
1390 | return PTR_ERR(skb); | |
1391 | ||
1392 | hdr = (struct sadb_msg *) skb->data; | |
1393 | hdr->sadb_msg_version = PF_KEY_V2; | |
1394 | hdr->sadb_msg_type = event2keytype(c->event); | |
1395 | hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); | |
1396 | hdr->sadb_msg_errno = 0; | |
1397 | hdr->sadb_msg_reserved = 0; | |
1398 | hdr->sadb_msg_seq = c->seq; | |
1399 | hdr->sadb_msg_pid = c->pid; | |
1400 | ||
1401 | pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL); | |
1402 | ||
1403 | return 0; | |
1404 | } | |
1da177e4 LT |
1405 | |
1406 | static int pfkey_add(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) | |
1407 | { | |
1da177e4 LT |
1408 | struct xfrm_state *x; |
1409 | int err; | |
26b15dad | 1410 | struct km_event c; |
1da177e4 LT |
1411 | |
1412 | xfrm_probe_algs(); | |
1413 | ||
1414 | x = pfkey_msg2xfrm_state(hdr, ext_hdrs); | |
1415 | if (IS_ERR(x)) | |
1416 | return PTR_ERR(x); | |
1417 | ||
26b15dad | 1418 | xfrm_state_hold(x); |
1da177e4 LT |
1419 | if (hdr->sadb_msg_type == SADB_ADD) |
1420 | err = xfrm_state_add(x); | |
1421 | else | |
1422 | err = xfrm_state_update(x); | |
1423 | ||
1424 | if (err < 0) { | |
1425 | x->km.state = XFRM_STATE_DEAD; | |
1426 | xfrm_state_put(x); | |
7d6dfe1f | 1427 | goto out; |
1da177e4 LT |
1428 | } |
1429 | ||
26b15dad | 1430 | if (hdr->sadb_msg_type == SADB_ADD) |
f60f6b8f | 1431 | c.event = XFRM_MSG_NEWSA; |
26b15dad | 1432 | else |
f60f6b8f | 1433 | c.event = XFRM_MSG_UPDSA; |
26b15dad JHS |
1434 | c.seq = hdr->sadb_msg_seq; |
1435 | c.pid = hdr->sadb_msg_pid; | |
1436 | km_state_notify(x, &c); | |
7d6dfe1f | 1437 | out: |
26b15dad | 1438 | xfrm_state_put(x); |
26b15dad | 1439 | return err; |
1da177e4 LT |
1440 | } |
1441 | ||
1442 | static int pfkey_delete(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) | |
1443 | { | |
1444 | struct xfrm_state *x; | |
26b15dad JHS |
1445 | struct km_event c; |
1446 | int err; | |
1da177e4 LT |
1447 | |
1448 | if (!ext_hdrs[SADB_EXT_SA-1] || | |
1449 | !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], | |
1450 | ext_hdrs[SADB_EXT_ADDRESS_DST-1])) | |
1451 | return -EINVAL; | |
1452 | ||
1453 | x = pfkey_xfrm_state_lookup(hdr, ext_hdrs); | |
1454 | if (x == NULL) | |
1455 | return -ESRCH; | |
1456 | ||
1457 | if (xfrm_state_kern(x)) { | |
1458 | xfrm_state_put(x); | |
1459 | return -EPERM; | |
1460 | } | |
1461 | ||
26b15dad JHS |
1462 | err = xfrm_state_delete(x); |
1463 | if (err < 0) { | |
1464 | xfrm_state_put(x); | |
1465 | return err; | |
1466 | } | |
1da177e4 | 1467 | |
26b15dad JHS |
1468 | c.seq = hdr->sadb_msg_seq; |
1469 | c.pid = hdr->sadb_msg_pid; | |
f60f6b8f | 1470 | c.event = XFRM_MSG_DELSA; |
26b15dad JHS |
1471 | km_state_notify(x, &c); |
1472 | xfrm_state_put(x); | |
1da177e4 | 1473 | |
26b15dad | 1474 | return err; |
1da177e4 LT |
1475 | } |
1476 | ||
1477 | static int pfkey_get(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) | |
1478 | { | |
1479 | __u8 proto; | |
1480 | struct sk_buff *out_skb; | |
1481 | struct sadb_msg *out_hdr; | |
1482 | struct xfrm_state *x; | |
1483 | ||
1484 | if (!ext_hdrs[SADB_EXT_SA-1] || | |
1485 | !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], | |
1486 | ext_hdrs[SADB_EXT_ADDRESS_DST-1])) | |
1487 | return -EINVAL; | |
1488 | ||
1489 | x = pfkey_xfrm_state_lookup(hdr, ext_hdrs); | |
1490 | if (x == NULL) | |
1491 | return -ESRCH; | |
1492 | ||
1493 | out_skb = pfkey_xfrm_state2msg(x, 1, 3); | |
1494 | proto = x->id.proto; | |
1495 | xfrm_state_put(x); | |
1496 | if (IS_ERR(out_skb)) | |
1497 | return PTR_ERR(out_skb); | |
1498 | ||
1499 | out_hdr = (struct sadb_msg *) out_skb->data; | |
1500 | out_hdr->sadb_msg_version = hdr->sadb_msg_version; | |
1501 | out_hdr->sadb_msg_type = SADB_DUMP; | |
1502 | out_hdr->sadb_msg_satype = pfkey_proto2satype(proto); | |
1503 | out_hdr->sadb_msg_errno = 0; | |
1504 | out_hdr->sadb_msg_reserved = 0; | |
1505 | out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; | |
1506 | out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; | |
1507 | pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk); | |
1508 | ||
1509 | return 0; | |
1510 | } | |
1511 | ||
00fa0233 | 1512 | static struct sk_buff *compose_sadb_supported(struct sadb_msg *orig, |
dd0fc66f | 1513 | gfp_t allocation) |
1da177e4 LT |
1514 | { |
1515 | struct sk_buff *skb; | |
1516 | struct sadb_msg *hdr; | |
1517 | int len, auth_len, enc_len, i; | |
1518 | ||
1519 | auth_len = xfrm_count_auth_supported(); | |
1520 | if (auth_len) { | |
1521 | auth_len *= sizeof(struct sadb_alg); | |
1522 | auth_len += sizeof(struct sadb_supported); | |
1523 | } | |
1524 | ||
1525 | enc_len = xfrm_count_enc_supported(); | |
1526 | if (enc_len) { | |
1527 | enc_len *= sizeof(struct sadb_alg); | |
1528 | enc_len += sizeof(struct sadb_supported); | |
1529 | } | |
1530 | ||
1531 | len = enc_len + auth_len + sizeof(struct sadb_msg); | |
1532 | ||
1533 | skb = alloc_skb(len + 16, allocation); | |
1534 | if (!skb) | |
1535 | goto out_put_algs; | |
1536 | ||
1537 | hdr = (struct sadb_msg *) skb_put(skb, sizeof(*hdr)); | |
1538 | pfkey_hdr_dup(hdr, orig); | |
1539 | hdr->sadb_msg_errno = 0; | |
1540 | hdr->sadb_msg_len = len / sizeof(uint64_t); | |
1541 | ||
1542 | if (auth_len) { | |
1543 | struct sadb_supported *sp; | |
1544 | struct sadb_alg *ap; | |
1545 | ||
1546 | sp = (struct sadb_supported *) skb_put(skb, auth_len); | |
1547 | ap = (struct sadb_alg *) (sp + 1); | |
1548 | ||
1549 | sp->sadb_supported_len = auth_len / sizeof(uint64_t); | |
1550 | sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH; | |
1551 | ||
1552 | for (i = 0; ; i++) { | |
1553 | struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); | |
1554 | if (!aalg) | |
1555 | break; | |
1556 | if (aalg->available) | |
1557 | *ap++ = aalg->desc; | |
1558 | } | |
1559 | } | |
1560 | ||
1561 | if (enc_len) { | |
1562 | struct sadb_supported *sp; | |
1563 | struct sadb_alg *ap; | |
1564 | ||
1565 | sp = (struct sadb_supported *) skb_put(skb, enc_len); | |
1566 | ap = (struct sadb_alg *) (sp + 1); | |
1567 | ||
1568 | sp->sadb_supported_len = enc_len / sizeof(uint64_t); | |
1569 | sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT; | |
1570 | ||
1571 | for (i = 0; ; i++) { | |
1572 | struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); | |
1573 | if (!ealg) | |
1574 | break; | |
1575 | if (ealg->available) | |
1576 | *ap++ = ealg->desc; | |
1577 | } | |
1578 | } | |
1579 | ||
1580 | out_put_algs: | |
1581 | return skb; | |
1582 | } | |
1583 | ||
1584 | static int pfkey_register(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) | |
1585 | { | |
1586 | struct pfkey_sock *pfk = pfkey_sk(sk); | |
1587 | struct sk_buff *supp_skb; | |
1588 | ||
1589 | if (hdr->sadb_msg_satype > SADB_SATYPE_MAX) | |
1590 | return -EINVAL; | |
1591 | ||
1592 | if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) { | |
1593 | if (pfk->registered&(1<<hdr->sadb_msg_satype)) | |
1594 | return -EEXIST; | |
1595 | pfk->registered |= (1<<hdr->sadb_msg_satype); | |
1596 | } | |
1597 | ||
1598 | xfrm_probe_algs(); | |
1599 | ||
1600 | supp_skb = compose_sadb_supported(hdr, GFP_KERNEL); | |
1601 | if (!supp_skb) { | |
1602 | if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) | |
1603 | pfk->registered &= ~(1<<hdr->sadb_msg_satype); | |
1604 | ||
1605 | return -ENOBUFS; | |
1606 | } | |
1607 | ||
1608 | pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk); | |
1609 | ||
1610 | return 0; | |
1611 | } | |
1612 | ||
26b15dad JHS |
1613 | static int key_notify_sa_flush(struct km_event *c) |
1614 | { | |
1615 | struct sk_buff *skb; | |
1616 | struct sadb_msg *hdr; | |
1617 | ||
1618 | skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC); | |
1619 | if (!skb) | |
1620 | return -ENOBUFS; | |
1621 | hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); | |
bf08867f | 1622 | hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto); |
26b15dad JHS |
1623 | hdr->sadb_msg_seq = c->seq; |
1624 | hdr->sadb_msg_pid = c->pid; | |
1625 | hdr->sadb_msg_version = PF_KEY_V2; | |
1626 | hdr->sadb_msg_errno = (uint8_t) 0; | |
1627 | hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t)); | |
1628 | ||
1629 | pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL); | |
1630 | ||
1631 | return 0; | |
1632 | } | |
1633 | ||
1da177e4 LT |
1634 | static int pfkey_flush(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) |
1635 | { | |
1636 | unsigned proto; | |
26b15dad | 1637 | struct km_event c; |
1da177e4 LT |
1638 | |
1639 | proto = pfkey_satype2proto(hdr->sadb_msg_satype); | |
1640 | if (proto == 0) | |
1641 | return -EINVAL; | |
1642 | ||
1da177e4 | 1643 | xfrm_state_flush(proto); |
bf08867f | 1644 | c.data.proto = proto; |
26b15dad JHS |
1645 | c.seq = hdr->sadb_msg_seq; |
1646 | c.pid = hdr->sadb_msg_pid; | |
f60f6b8f | 1647 | c.event = XFRM_MSG_FLUSHSA; |
26b15dad | 1648 | km_state_notify(NULL, &c); |
1da177e4 LT |
1649 | |
1650 | return 0; | |
1651 | } | |
1652 | ||
1653 | struct pfkey_dump_data | |
1654 | { | |
1655 | struct sk_buff *skb; | |
1656 | struct sadb_msg *hdr; | |
1657 | struct sock *sk; | |
1658 | }; | |
1659 | ||
1660 | static int dump_sa(struct xfrm_state *x, int count, void *ptr) | |
1661 | { | |
1662 | struct pfkey_dump_data *data = ptr; | |
1663 | struct sk_buff *out_skb; | |
1664 | struct sadb_msg *out_hdr; | |
1665 | ||
1666 | out_skb = pfkey_xfrm_state2msg(x, 1, 3); | |
1667 | if (IS_ERR(out_skb)) | |
1668 | return PTR_ERR(out_skb); | |
1669 | ||
1670 | out_hdr = (struct sadb_msg *) out_skb->data; | |
1671 | out_hdr->sadb_msg_version = data->hdr->sadb_msg_version; | |
1672 | out_hdr->sadb_msg_type = SADB_DUMP; | |
1673 | out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); | |
1674 | out_hdr->sadb_msg_errno = 0; | |
1675 | out_hdr->sadb_msg_reserved = 0; | |
1676 | out_hdr->sadb_msg_seq = count; | |
1677 | out_hdr->sadb_msg_pid = data->hdr->sadb_msg_pid; | |
1678 | pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, data->sk); | |
1679 | return 0; | |
1680 | } | |
1681 | ||
1682 | static int pfkey_dump(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) | |
1683 | { | |
1684 | u8 proto; | |
1685 | struct pfkey_dump_data data = { .skb = skb, .hdr = hdr, .sk = sk }; | |
1686 | ||
1687 | proto = pfkey_satype2proto(hdr->sadb_msg_satype); | |
1688 | if (proto == 0) | |
1689 | return -EINVAL; | |
1690 | ||
1691 | return xfrm_state_walk(proto, dump_sa, &data); | |
1692 | } | |
1693 | ||
1694 | static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) | |
1695 | { | |
1696 | struct pfkey_sock *pfk = pfkey_sk(sk); | |
1697 | int satype = hdr->sadb_msg_satype; | |
1698 | ||
1699 | if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) { | |
1700 | /* XXX we mangle packet... */ | |
1701 | hdr->sadb_msg_errno = 0; | |
1702 | if (satype != 0 && satype != 1) | |
1703 | return -EINVAL; | |
1704 | pfk->promisc = satype; | |
1705 | } | |
1706 | pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL, BROADCAST_ALL, NULL); | |
1707 | return 0; | |
1708 | } | |
1709 | ||
1710 | static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr) | |
1711 | { | |
1712 | int i; | |
1713 | u32 reqid = *(u32*)ptr; | |
1714 | ||
1715 | for (i=0; i<xp->xfrm_nr; i++) { | |
1716 | if (xp->xfrm_vec[i].reqid == reqid) | |
1717 | return -EEXIST; | |
1718 | } | |
1719 | return 0; | |
1720 | } | |
1721 | ||
1722 | static u32 gen_reqid(void) | |
1723 | { | |
1724 | u32 start; | |
1725 | static u32 reqid = IPSEC_MANUAL_REQID_MAX; | |
1726 | ||
1727 | start = reqid; | |
1728 | do { | |
1729 | ++reqid; | |
1730 | if (reqid == 0) | |
1731 | reqid = IPSEC_MANUAL_REQID_MAX+1; | |
1732 | if (xfrm_policy_walk(check_reqid, (void*)&reqid) != -EEXIST) | |
1733 | return reqid; | |
1734 | } while (reqid != start); | |
1735 | return 0; | |
1736 | } | |
1737 | ||
1738 | static int | |
1739 | parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq) | |
1740 | { | |
1741 | struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr; | |
1742 | struct sockaddr_in *sin; | |
1743 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
1744 | struct sockaddr_in6 *sin6; | |
1745 | #endif | |
1746 | ||
1747 | if (xp->xfrm_nr >= XFRM_MAX_DEPTH) | |
1748 | return -ELOOP; | |
1749 | ||
1750 | if (rq->sadb_x_ipsecrequest_mode == 0) | |
1751 | return -EINVAL; | |
1752 | ||
1753 | t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */ | |
1754 | t->mode = rq->sadb_x_ipsecrequest_mode-1; | |
1755 | if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE) | |
1756 | t->optional = 1; | |
1757 | else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) { | |
1758 | t->reqid = rq->sadb_x_ipsecrequest_reqid; | |
1759 | if (t->reqid > IPSEC_MANUAL_REQID_MAX) | |
1760 | t->reqid = 0; | |
1761 | if (!t->reqid && !(t->reqid = gen_reqid())) | |
1762 | return -ENOBUFS; | |
1763 | } | |
1764 | ||
1765 | /* addresses present only in tunnel mode */ | |
1766 | if (t->mode) { | |
1767 | switch (xp->family) { | |
1768 | case AF_INET: | |
1769 | sin = (void*)(rq+1); | |
1770 | if (sin->sin_family != AF_INET) | |
1771 | return -EINVAL; | |
1772 | t->saddr.a4 = sin->sin_addr.s_addr; | |
1773 | sin++; | |
1774 | if (sin->sin_family != AF_INET) | |
1775 | return -EINVAL; | |
1776 | t->id.daddr.a4 = sin->sin_addr.s_addr; | |
1777 | break; | |
1778 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
1779 | case AF_INET6: | |
1780 | sin6 = (void *)(rq+1); | |
1781 | if (sin6->sin6_family != AF_INET6) | |
1782 | return -EINVAL; | |
1783 | memcpy(t->saddr.a6, &sin6->sin6_addr, sizeof(struct in6_addr)); | |
1784 | sin6++; | |
1785 | if (sin6->sin6_family != AF_INET6) | |
1786 | return -EINVAL; | |
1787 | memcpy(t->id.daddr.a6, &sin6->sin6_addr, sizeof(struct in6_addr)); | |
1788 | break; | |
1789 | #endif | |
1790 | default: | |
1791 | return -EINVAL; | |
1792 | } | |
1793 | } | |
1794 | /* No way to set this via kame pfkey */ | |
1795 | t->aalgos = t->ealgos = t->calgos = ~0; | |
1796 | xp->xfrm_nr++; | |
1797 | return 0; | |
1798 | } | |
1799 | ||
1800 | static int | |
1801 | parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol) | |
1802 | { | |
1803 | int err; | |
1804 | int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy); | |
1805 | struct sadb_x_ipsecrequest *rq = (void*)(pol+1); | |
1806 | ||
1807 | while (len >= sizeof(struct sadb_x_ipsecrequest)) { | |
1808 | if ((err = parse_ipsecrequest(xp, rq)) < 0) | |
1809 | return err; | |
1810 | len -= rq->sadb_x_ipsecrequest_len; | |
1811 | rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len); | |
1812 | } | |
1813 | return 0; | |
1814 | } | |
1815 | ||
df71837d TJ |
1816 | static inline int pfkey_xfrm_policy2sec_ctx_size(struct xfrm_policy *xp) |
1817 | { | |
1818 | struct xfrm_sec_ctx *xfrm_ctx = xp->security; | |
1819 | ||
1820 | if (xfrm_ctx) { | |
1821 | int len = sizeof(struct sadb_x_sec_ctx); | |
1822 | len += xfrm_ctx->ctx_len; | |
1823 | return PFKEY_ALIGN8(len); | |
1824 | } | |
1825 | return 0; | |
1826 | } | |
1827 | ||
1da177e4 LT |
1828 | static int pfkey_xfrm_policy2msg_size(struct xfrm_policy *xp) |
1829 | { | |
1830 | int sockaddr_size = pfkey_sockaddr_size(xp->family); | |
1831 | int socklen = (xp->family == AF_INET ? | |
1832 | sizeof(struct sockaddr_in) : | |
1833 | sizeof(struct sockaddr_in6)); | |
1834 | ||
1835 | return sizeof(struct sadb_msg) + | |
1836 | (sizeof(struct sadb_lifetime) * 3) + | |
1837 | (sizeof(struct sadb_address) * 2) + | |
1838 | (sockaddr_size * 2) + | |
1839 | sizeof(struct sadb_x_policy) + | |
1840 | (xp->xfrm_nr * (sizeof(struct sadb_x_ipsecrequest) + | |
df71837d TJ |
1841 | (socklen * 2))) + |
1842 | pfkey_xfrm_policy2sec_ctx_size(xp); | |
1da177e4 LT |
1843 | } |
1844 | ||
1845 | static struct sk_buff * pfkey_xfrm_policy2msg_prep(struct xfrm_policy *xp) | |
1846 | { | |
1847 | struct sk_buff *skb; | |
1848 | int size; | |
1849 | ||
1850 | size = pfkey_xfrm_policy2msg_size(xp); | |
1851 | ||
1852 | skb = alloc_skb(size + 16, GFP_ATOMIC); | |
1853 | if (skb == NULL) | |
1854 | return ERR_PTR(-ENOBUFS); | |
1855 | ||
1856 | return skb; | |
1857 | } | |
1858 | ||
1859 | static void pfkey_xfrm_policy2msg(struct sk_buff *skb, struct xfrm_policy *xp, int dir) | |
1860 | { | |
1861 | struct sadb_msg *hdr; | |
1862 | struct sadb_address *addr; | |
1863 | struct sadb_lifetime *lifetime; | |
1864 | struct sadb_x_policy *pol; | |
1865 | struct sockaddr_in *sin; | |
df71837d TJ |
1866 | struct sadb_x_sec_ctx *sec_ctx; |
1867 | struct xfrm_sec_ctx *xfrm_ctx; | |
1da177e4 LT |
1868 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
1869 | struct sockaddr_in6 *sin6; | |
1870 | #endif | |
1871 | int i; | |
1872 | int size; | |
1873 | int sockaddr_size = pfkey_sockaddr_size(xp->family); | |
1874 | int socklen = (xp->family == AF_INET ? | |
1875 | sizeof(struct sockaddr_in) : | |
1876 | sizeof(struct sockaddr_in6)); | |
1877 | ||
1878 | size = pfkey_xfrm_policy2msg_size(xp); | |
1879 | ||
1880 | /* call should fill header later */ | |
1881 | hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); | |
1882 | memset(hdr, 0, size); /* XXX do we need this ? */ | |
1883 | ||
1884 | /* src address */ | |
1885 | addr = (struct sadb_address*) skb_put(skb, | |
1886 | sizeof(struct sadb_address)+sockaddr_size); | |
1887 | addr->sadb_address_len = | |
1888 | (sizeof(struct sadb_address)+sockaddr_size)/ | |
1889 | sizeof(uint64_t); | |
1890 | addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; | |
1891 | addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto); | |
1892 | addr->sadb_address_prefixlen = xp->selector.prefixlen_s; | |
1893 | addr->sadb_address_reserved = 0; | |
1894 | /* src address */ | |
1895 | if (xp->family == AF_INET) { | |
1896 | sin = (struct sockaddr_in *) (addr + 1); | |
1897 | sin->sin_family = AF_INET; | |
1898 | sin->sin_addr.s_addr = xp->selector.saddr.a4; | |
1899 | sin->sin_port = xp->selector.sport; | |
1900 | memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
1901 | } | |
1902 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
1903 | else if (xp->family == AF_INET6) { | |
1904 | sin6 = (struct sockaddr_in6 *) (addr + 1); | |
1905 | sin6->sin6_family = AF_INET6; | |
1906 | sin6->sin6_port = xp->selector.sport; | |
1907 | sin6->sin6_flowinfo = 0; | |
1908 | memcpy(&sin6->sin6_addr, xp->selector.saddr.a6, | |
1909 | sizeof(struct in6_addr)); | |
1910 | sin6->sin6_scope_id = 0; | |
1911 | } | |
1912 | #endif | |
1913 | else | |
1914 | BUG(); | |
1915 | ||
1916 | /* dst address */ | |
1917 | addr = (struct sadb_address*) skb_put(skb, | |
1918 | sizeof(struct sadb_address)+sockaddr_size); | |
1919 | addr->sadb_address_len = | |
1920 | (sizeof(struct sadb_address)+sockaddr_size)/ | |
1921 | sizeof(uint64_t); | |
1922 | addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; | |
1923 | addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto); | |
1924 | addr->sadb_address_prefixlen = xp->selector.prefixlen_d; | |
1925 | addr->sadb_address_reserved = 0; | |
1926 | if (xp->family == AF_INET) { | |
1927 | sin = (struct sockaddr_in *) (addr + 1); | |
1928 | sin->sin_family = AF_INET; | |
1929 | sin->sin_addr.s_addr = xp->selector.daddr.a4; | |
1930 | sin->sin_port = xp->selector.dport; | |
1931 | memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
1932 | } | |
1933 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
1934 | else if (xp->family == AF_INET6) { | |
1935 | sin6 = (struct sockaddr_in6 *) (addr + 1); | |
1936 | sin6->sin6_family = AF_INET6; | |
1937 | sin6->sin6_port = xp->selector.dport; | |
1938 | sin6->sin6_flowinfo = 0; | |
1939 | memcpy(&sin6->sin6_addr, xp->selector.daddr.a6, | |
1940 | sizeof(struct in6_addr)); | |
1941 | sin6->sin6_scope_id = 0; | |
1942 | } | |
1943 | #endif | |
1944 | else | |
1945 | BUG(); | |
1946 | ||
1947 | /* hard time */ | |
1948 | lifetime = (struct sadb_lifetime *) skb_put(skb, | |
1949 | sizeof(struct sadb_lifetime)); | |
1950 | lifetime->sadb_lifetime_len = | |
1951 | sizeof(struct sadb_lifetime)/sizeof(uint64_t); | |
1952 | lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD; | |
1953 | lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.hard_packet_limit); | |
1954 | lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit); | |
1955 | lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds; | |
1956 | lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds; | |
1957 | /* soft time */ | |
1958 | lifetime = (struct sadb_lifetime *) skb_put(skb, | |
1959 | sizeof(struct sadb_lifetime)); | |
1960 | lifetime->sadb_lifetime_len = | |
1961 | sizeof(struct sadb_lifetime)/sizeof(uint64_t); | |
1962 | lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT; | |
1963 | lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.soft_packet_limit); | |
1964 | lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit); | |
1965 | lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds; | |
1966 | lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds; | |
1967 | /* current time */ | |
1968 | lifetime = (struct sadb_lifetime *) skb_put(skb, | |
1969 | sizeof(struct sadb_lifetime)); | |
1970 | lifetime->sadb_lifetime_len = | |
1971 | sizeof(struct sadb_lifetime)/sizeof(uint64_t); | |
1972 | lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; | |
1973 | lifetime->sadb_lifetime_allocations = xp->curlft.packets; | |
1974 | lifetime->sadb_lifetime_bytes = xp->curlft.bytes; | |
1975 | lifetime->sadb_lifetime_addtime = xp->curlft.add_time; | |
1976 | lifetime->sadb_lifetime_usetime = xp->curlft.use_time; | |
1977 | ||
1978 | pol = (struct sadb_x_policy *) skb_put(skb, sizeof(struct sadb_x_policy)); | |
1979 | pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t); | |
1980 | pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; | |
1981 | pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD; | |
1982 | if (xp->action == XFRM_POLICY_ALLOW) { | |
1983 | if (xp->xfrm_nr) | |
1984 | pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; | |
1985 | else | |
1986 | pol->sadb_x_policy_type = IPSEC_POLICY_NONE; | |
1987 | } | |
1988 | pol->sadb_x_policy_dir = dir+1; | |
1989 | pol->sadb_x_policy_id = xp->index; | |
1990 | pol->sadb_x_policy_priority = xp->priority; | |
1991 | ||
1992 | for (i=0; i<xp->xfrm_nr; i++) { | |
1993 | struct sadb_x_ipsecrequest *rq; | |
1994 | struct xfrm_tmpl *t = xp->xfrm_vec + i; | |
1995 | int req_size; | |
1996 | ||
1997 | req_size = sizeof(struct sadb_x_ipsecrequest); | |
1998 | if (t->mode) | |
1999 | req_size += 2*socklen; | |
2000 | else | |
2001 | size -= 2*socklen; | |
2002 | rq = (void*)skb_put(skb, req_size); | |
2003 | pol->sadb_x_policy_len += req_size/8; | |
2004 | memset(rq, 0, sizeof(*rq)); | |
2005 | rq->sadb_x_ipsecrequest_len = req_size; | |
2006 | rq->sadb_x_ipsecrequest_proto = t->id.proto; | |
2007 | rq->sadb_x_ipsecrequest_mode = t->mode+1; | |
2008 | rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE; | |
2009 | if (t->reqid) | |
2010 | rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE; | |
2011 | if (t->optional) | |
2012 | rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE; | |
2013 | rq->sadb_x_ipsecrequest_reqid = t->reqid; | |
2014 | if (t->mode) { | |
2015 | switch (xp->family) { | |
2016 | case AF_INET: | |
2017 | sin = (void*)(rq+1); | |
2018 | sin->sin_family = AF_INET; | |
2019 | sin->sin_addr.s_addr = t->saddr.a4; | |
2020 | sin->sin_port = 0; | |
2021 | memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
2022 | sin++; | |
2023 | sin->sin_family = AF_INET; | |
2024 | sin->sin_addr.s_addr = t->id.daddr.a4; | |
2025 | sin->sin_port = 0; | |
2026 | memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
2027 | break; | |
2028 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
2029 | case AF_INET6: | |
2030 | sin6 = (void*)(rq+1); | |
2031 | sin6->sin6_family = AF_INET6; | |
2032 | sin6->sin6_port = 0; | |
2033 | sin6->sin6_flowinfo = 0; | |
2034 | memcpy(&sin6->sin6_addr, t->saddr.a6, | |
2035 | sizeof(struct in6_addr)); | |
2036 | sin6->sin6_scope_id = 0; | |
2037 | ||
2038 | sin6++; | |
2039 | sin6->sin6_family = AF_INET6; | |
2040 | sin6->sin6_port = 0; | |
2041 | sin6->sin6_flowinfo = 0; | |
2042 | memcpy(&sin6->sin6_addr, t->id.daddr.a6, | |
2043 | sizeof(struct in6_addr)); | |
2044 | sin6->sin6_scope_id = 0; | |
2045 | break; | |
2046 | #endif | |
2047 | default: | |
2048 | break; | |
2049 | } | |
2050 | } | |
2051 | } | |
df71837d TJ |
2052 | |
2053 | /* security context */ | |
2054 | if ((xfrm_ctx = xp->security)) { | |
2055 | int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp); | |
2056 | ||
2057 | sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, ctx_size); | |
2058 | sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t); | |
2059 | sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX; | |
2060 | sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi; | |
2061 | sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg; | |
2062 | sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len; | |
2063 | memcpy(sec_ctx + 1, xfrm_ctx->ctx_str, | |
2064 | xfrm_ctx->ctx_len); | |
2065 | } | |
2066 | ||
1da177e4 LT |
2067 | hdr->sadb_msg_len = size / sizeof(uint64_t); |
2068 | hdr->sadb_msg_reserved = atomic_read(&xp->refcnt); | |
2069 | } | |
2070 | ||
26b15dad JHS |
2071 | static int key_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c) |
2072 | { | |
2073 | struct sk_buff *out_skb; | |
2074 | struct sadb_msg *out_hdr; | |
2075 | int err; | |
2076 | ||
2077 | out_skb = pfkey_xfrm_policy2msg_prep(xp); | |
2078 | if (IS_ERR(out_skb)) { | |
2079 | err = PTR_ERR(out_skb); | |
2080 | goto out; | |
2081 | } | |
2082 | pfkey_xfrm_policy2msg(out_skb, xp, dir); | |
2083 | ||
2084 | out_hdr = (struct sadb_msg *) out_skb->data; | |
2085 | out_hdr->sadb_msg_version = PF_KEY_V2; | |
2086 | ||
f60f6b8f | 2087 | if (c->data.byid && c->event == XFRM_MSG_DELPOLICY) |
26b15dad JHS |
2088 | out_hdr->sadb_msg_type = SADB_X_SPDDELETE2; |
2089 | else | |
2090 | out_hdr->sadb_msg_type = event2poltype(c->event); | |
2091 | out_hdr->sadb_msg_errno = 0; | |
2092 | out_hdr->sadb_msg_seq = c->seq; | |
2093 | out_hdr->sadb_msg_pid = c->pid; | |
2094 | pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL); | |
2095 | out: | |
2096 | return 0; | |
2097 | ||
2098 | } | |
2099 | ||
1da177e4 LT |
2100 | static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) |
2101 | { | |
df71837d | 2102 | int err = 0; |
1da177e4 LT |
2103 | struct sadb_lifetime *lifetime; |
2104 | struct sadb_address *sa; | |
2105 | struct sadb_x_policy *pol; | |
2106 | struct xfrm_policy *xp; | |
26b15dad | 2107 | struct km_event c; |
df71837d | 2108 | struct sadb_x_sec_ctx *sec_ctx; |
1da177e4 LT |
2109 | |
2110 | if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], | |
2111 | ext_hdrs[SADB_EXT_ADDRESS_DST-1]) || | |
2112 | !ext_hdrs[SADB_X_EXT_POLICY-1]) | |
2113 | return -EINVAL; | |
2114 | ||
2115 | pol = ext_hdrs[SADB_X_EXT_POLICY-1]; | |
2116 | if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC) | |
2117 | return -EINVAL; | |
2118 | if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) | |
2119 | return -EINVAL; | |
2120 | ||
2121 | xp = xfrm_policy_alloc(GFP_KERNEL); | |
2122 | if (xp == NULL) | |
2123 | return -ENOBUFS; | |
2124 | ||
2125 | xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ? | |
2126 | XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW); | |
2127 | xp->priority = pol->sadb_x_policy_priority; | |
2128 | ||
2129 | sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1], | |
2130 | xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr); | |
2131 | if (!xp->family) { | |
2132 | err = -EINVAL; | |
2133 | goto out; | |
2134 | } | |
2135 | xp->selector.family = xp->family; | |
2136 | xp->selector.prefixlen_s = sa->sadb_address_prefixlen; | |
2137 | xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); | |
2138 | xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port; | |
2139 | if (xp->selector.sport) | |
2140 | xp->selector.sport_mask = ~0; | |
2141 | ||
2142 | sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1], | |
2143 | pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr); | |
2144 | xp->selector.prefixlen_d = sa->sadb_address_prefixlen; | |
2145 | ||
2146 | /* Amusing, we set this twice. KAME apps appear to set same value | |
2147 | * in both addresses. | |
2148 | */ | |
2149 | xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); | |
2150 | ||
2151 | xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port; | |
2152 | if (xp->selector.dport) | |
2153 | xp->selector.dport_mask = ~0; | |
2154 | ||
df71837d TJ |
2155 | sec_ctx = (struct sadb_x_sec_ctx *) ext_hdrs[SADB_X_EXT_SEC_CTX-1]; |
2156 | if (sec_ctx != NULL) { | |
2157 | struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx); | |
2158 | ||
2159 | if (!uctx) { | |
2160 | err = -ENOBUFS; | |
2161 | goto out; | |
2162 | } | |
2163 | ||
2164 | err = security_xfrm_policy_alloc(xp, uctx); | |
2165 | kfree(uctx); | |
2166 | ||
2167 | if (err) | |
2168 | goto out; | |
2169 | } | |
2170 | ||
1da177e4 LT |
2171 | xp->lft.soft_byte_limit = XFRM_INF; |
2172 | xp->lft.hard_byte_limit = XFRM_INF; | |
2173 | xp->lft.soft_packet_limit = XFRM_INF; | |
2174 | xp->lft.hard_packet_limit = XFRM_INF; | |
2175 | if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) { | |
2176 | xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); | |
2177 | xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); | |
2178 | xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime; | |
2179 | xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime; | |
2180 | } | |
2181 | if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) { | |
2182 | xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); | |
2183 | xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); | |
2184 | xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime; | |
2185 | xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime; | |
2186 | } | |
2187 | xp->xfrm_nr = 0; | |
2188 | if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC && | |
2189 | (err = parse_ipsecrequests(xp, pol)) < 0) | |
2190 | goto out; | |
2191 | ||
1da177e4 LT |
2192 | err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp, |
2193 | hdr->sadb_msg_type != SADB_X_SPDUPDATE); | |
df71837d TJ |
2194 | |
2195 | if (err) | |
2196 | goto out; | |
1da177e4 | 2197 | |
26b15dad | 2198 | if (hdr->sadb_msg_type == SADB_X_SPDUPDATE) |
f60f6b8f HX |
2199 | c.event = XFRM_MSG_UPDPOLICY; |
2200 | else | |
2201 | c.event = XFRM_MSG_NEWPOLICY; | |
1da177e4 | 2202 | |
26b15dad JHS |
2203 | c.seq = hdr->sadb_msg_seq; |
2204 | c.pid = hdr->sadb_msg_pid; | |
1da177e4 | 2205 | |
26b15dad JHS |
2206 | km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c); |
2207 | xfrm_pol_put(xp); | |
1da177e4 LT |
2208 | return 0; |
2209 | ||
2210 | out: | |
df71837d | 2211 | security_xfrm_policy_free(xp); |
1da177e4 LT |
2212 | kfree(xp); |
2213 | return err; | |
2214 | } | |
2215 | ||
2216 | static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) | |
2217 | { | |
2218 | int err; | |
2219 | struct sadb_address *sa; | |
2220 | struct sadb_x_policy *pol; | |
df71837d | 2221 | struct xfrm_policy *xp, tmp; |
1da177e4 | 2222 | struct xfrm_selector sel; |
26b15dad | 2223 | struct km_event c; |
df71837d | 2224 | struct sadb_x_sec_ctx *sec_ctx; |
1da177e4 LT |
2225 | |
2226 | if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], | |
2227 | ext_hdrs[SADB_EXT_ADDRESS_DST-1]) || | |
2228 | !ext_hdrs[SADB_X_EXT_POLICY-1]) | |
2229 | return -EINVAL; | |
2230 | ||
2231 | pol = ext_hdrs[SADB_X_EXT_POLICY-1]; | |
2232 | if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) | |
2233 | return -EINVAL; | |
2234 | ||
2235 | memset(&sel, 0, sizeof(sel)); | |
2236 | ||
2237 | sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1], | |
2238 | sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr); | |
2239 | sel.prefixlen_s = sa->sadb_address_prefixlen; | |
2240 | sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); | |
2241 | sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port; | |
2242 | if (sel.sport) | |
2243 | sel.sport_mask = ~0; | |
2244 | ||
2245 | sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1], | |
2246 | pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr); | |
2247 | sel.prefixlen_d = sa->sadb_address_prefixlen; | |
2248 | sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); | |
2249 | sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port; | |
2250 | if (sel.dport) | |
2251 | sel.dport_mask = ~0; | |
2252 | ||
df71837d TJ |
2253 | sec_ctx = (struct sadb_x_sec_ctx *) ext_hdrs[SADB_X_EXT_SEC_CTX-1]; |
2254 | memset(&tmp, 0, sizeof(struct xfrm_policy)); | |
2255 | ||
2256 | if (sec_ctx != NULL) { | |
2257 | struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx); | |
2258 | ||
2259 | if (!uctx) | |
2260 | return -ENOMEM; | |
2261 | ||
2262 | err = security_xfrm_policy_alloc(&tmp, uctx); | |
2263 | kfree(uctx); | |
2264 | ||
2265 | if (err) | |
2266 | return err; | |
2267 | } | |
2268 | ||
2269 | xp = xfrm_policy_bysel_ctx(pol->sadb_x_policy_dir-1, &sel, tmp.security, 1); | |
2270 | security_xfrm_policy_free(&tmp); | |
1da177e4 LT |
2271 | if (xp == NULL) |
2272 | return -ENOENT; | |
2273 | ||
2274 | err = 0; | |
2275 | ||
26b15dad JHS |
2276 | c.seq = hdr->sadb_msg_seq; |
2277 | c.pid = hdr->sadb_msg_pid; | |
f60f6b8f | 2278 | c.event = XFRM_MSG_DELPOLICY; |
26b15dad JHS |
2279 | km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c); |
2280 | ||
2281 | xfrm_pol_put(xp); | |
2282 | return err; | |
2283 | } | |
2284 | ||
2285 | static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, struct sadb_msg *hdr, int dir) | |
2286 | { | |
2287 | int err; | |
2288 | struct sk_buff *out_skb; | |
2289 | struct sadb_msg *out_hdr; | |
2290 | err = 0; | |
2291 | ||
1da177e4 LT |
2292 | out_skb = pfkey_xfrm_policy2msg_prep(xp); |
2293 | if (IS_ERR(out_skb)) { | |
2294 | err = PTR_ERR(out_skb); | |
2295 | goto out; | |
2296 | } | |
26b15dad | 2297 | pfkey_xfrm_policy2msg(out_skb, xp, dir); |
1da177e4 LT |
2298 | |
2299 | out_hdr = (struct sadb_msg *) out_skb->data; | |
2300 | out_hdr->sadb_msg_version = hdr->sadb_msg_version; | |
26b15dad | 2301 | out_hdr->sadb_msg_type = hdr->sadb_msg_type; |
1da177e4 LT |
2302 | out_hdr->sadb_msg_satype = 0; |
2303 | out_hdr->sadb_msg_errno = 0; | |
2304 | out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; | |
2305 | out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; | |
26b15dad | 2306 | pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk); |
1da177e4 LT |
2307 | err = 0; |
2308 | ||
2309 | out: | |
1da177e4 LT |
2310 | return err; |
2311 | } | |
2312 | ||
2313 | static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) | |
2314 | { | |
77d8d7a6 | 2315 | unsigned int dir; |
1da177e4 LT |
2316 | int err; |
2317 | struct sadb_x_policy *pol; | |
2318 | struct xfrm_policy *xp; | |
26b15dad | 2319 | struct km_event c; |
1da177e4 LT |
2320 | |
2321 | if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL) | |
2322 | return -EINVAL; | |
2323 | ||
77d8d7a6 HX |
2324 | dir = xfrm_policy_id2dir(pol->sadb_x_policy_id); |
2325 | if (dir >= XFRM_POLICY_MAX) | |
2326 | return -EINVAL; | |
2327 | ||
2328 | xp = xfrm_policy_byid(dir, pol->sadb_x_policy_id, | |
1da177e4 LT |
2329 | hdr->sadb_msg_type == SADB_X_SPDDELETE2); |
2330 | if (xp == NULL) | |
2331 | return -ENOENT; | |
2332 | ||
2333 | err = 0; | |
2334 | ||
26b15dad JHS |
2335 | c.seq = hdr->sadb_msg_seq; |
2336 | c.pid = hdr->sadb_msg_pid; | |
2337 | if (hdr->sadb_msg_type == SADB_X_SPDDELETE2) { | |
bf08867f | 2338 | c.data.byid = 1; |
f60f6b8f | 2339 | c.event = XFRM_MSG_DELPOLICY; |
77d8d7a6 | 2340 | km_policy_notify(xp, dir, &c); |
26b15dad | 2341 | } else { |
77d8d7a6 | 2342 | err = key_pol_get_resp(sk, xp, hdr, dir); |
1da177e4 | 2343 | } |
1da177e4 | 2344 | |
1da177e4 LT |
2345 | xfrm_pol_put(xp); |
2346 | return err; | |
2347 | } | |
2348 | ||
2349 | static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr) | |
2350 | { | |
2351 | struct pfkey_dump_data *data = ptr; | |
2352 | struct sk_buff *out_skb; | |
2353 | struct sadb_msg *out_hdr; | |
2354 | ||
2355 | out_skb = pfkey_xfrm_policy2msg_prep(xp); | |
2356 | if (IS_ERR(out_skb)) | |
2357 | return PTR_ERR(out_skb); | |
2358 | ||
2359 | pfkey_xfrm_policy2msg(out_skb, xp, dir); | |
2360 | ||
2361 | out_hdr = (struct sadb_msg *) out_skb->data; | |
2362 | out_hdr->sadb_msg_version = data->hdr->sadb_msg_version; | |
2363 | out_hdr->sadb_msg_type = SADB_X_SPDDUMP; | |
2364 | out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC; | |
2365 | out_hdr->sadb_msg_errno = 0; | |
2366 | out_hdr->sadb_msg_seq = count; | |
2367 | out_hdr->sadb_msg_pid = data->hdr->sadb_msg_pid; | |
2368 | pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, data->sk); | |
2369 | return 0; | |
2370 | } | |
2371 | ||
2372 | static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) | |
2373 | { | |
2374 | struct pfkey_dump_data data = { .skb = skb, .hdr = hdr, .sk = sk }; | |
2375 | ||
2376 | return xfrm_policy_walk(dump_sp, &data); | |
2377 | } | |
2378 | ||
26b15dad | 2379 | static int key_notify_policy_flush(struct km_event *c) |
1da177e4 LT |
2380 | { |
2381 | struct sk_buff *skb_out; | |
26b15dad | 2382 | struct sadb_msg *hdr; |
1da177e4 | 2383 | |
26b15dad | 2384 | skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC); |
1da177e4 LT |
2385 | if (!skb_out) |
2386 | return -ENOBUFS; | |
26b15dad JHS |
2387 | hdr = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg)); |
2388 | hdr->sadb_msg_seq = c->seq; | |
2389 | hdr->sadb_msg_pid = c->pid; | |
2390 | hdr->sadb_msg_version = PF_KEY_V2; | |
2391 | hdr->sadb_msg_errno = (uint8_t) 0; | |
2392 | hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t)); | |
2393 | pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL); | |
2394 | return 0; | |
1da177e4 | 2395 | |
26b15dad JHS |
2396 | } |
2397 | ||
2398 | static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) | |
2399 | { | |
2400 | struct km_event c; | |
1da177e4 | 2401 | |
26b15dad | 2402 | xfrm_policy_flush(); |
f60f6b8f | 2403 | c.event = XFRM_MSG_FLUSHPOLICY; |
26b15dad JHS |
2404 | c.pid = hdr->sadb_msg_pid; |
2405 | c.seq = hdr->sadb_msg_seq; | |
2406 | km_policy_notify(NULL, 0, &c); | |
1da177e4 LT |
2407 | |
2408 | return 0; | |
2409 | } | |
2410 | ||
2411 | typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb, | |
2412 | struct sadb_msg *hdr, void **ext_hdrs); | |
2413 | static pfkey_handler pfkey_funcs[SADB_MAX + 1] = { | |
2414 | [SADB_RESERVED] = pfkey_reserved, | |
2415 | [SADB_GETSPI] = pfkey_getspi, | |
2416 | [SADB_UPDATE] = pfkey_add, | |
2417 | [SADB_ADD] = pfkey_add, | |
2418 | [SADB_DELETE] = pfkey_delete, | |
2419 | [SADB_GET] = pfkey_get, | |
2420 | [SADB_ACQUIRE] = pfkey_acquire, | |
2421 | [SADB_REGISTER] = pfkey_register, | |
2422 | [SADB_EXPIRE] = NULL, | |
2423 | [SADB_FLUSH] = pfkey_flush, | |
2424 | [SADB_DUMP] = pfkey_dump, | |
2425 | [SADB_X_PROMISC] = pfkey_promisc, | |
2426 | [SADB_X_PCHANGE] = NULL, | |
2427 | [SADB_X_SPDUPDATE] = pfkey_spdadd, | |
2428 | [SADB_X_SPDADD] = pfkey_spdadd, | |
2429 | [SADB_X_SPDDELETE] = pfkey_spddelete, | |
2430 | [SADB_X_SPDGET] = pfkey_spdget, | |
2431 | [SADB_X_SPDACQUIRE] = NULL, | |
2432 | [SADB_X_SPDDUMP] = pfkey_spddump, | |
2433 | [SADB_X_SPDFLUSH] = pfkey_spdflush, | |
2434 | [SADB_X_SPDSETIDX] = pfkey_spdadd, | |
2435 | [SADB_X_SPDDELETE2] = pfkey_spdget, | |
2436 | }; | |
2437 | ||
2438 | static int pfkey_process(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr) | |
2439 | { | |
2440 | void *ext_hdrs[SADB_EXT_MAX]; | |
2441 | int err; | |
2442 | ||
2443 | pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL, | |
2444 | BROADCAST_PROMISC_ONLY, NULL); | |
2445 | ||
2446 | memset(ext_hdrs, 0, sizeof(ext_hdrs)); | |
2447 | err = parse_exthdrs(skb, hdr, ext_hdrs); | |
2448 | if (!err) { | |
2449 | err = -EOPNOTSUPP; | |
2450 | if (pfkey_funcs[hdr->sadb_msg_type]) | |
2451 | err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs); | |
2452 | } | |
2453 | return err; | |
2454 | } | |
2455 | ||
2456 | static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp) | |
2457 | { | |
2458 | struct sadb_msg *hdr = NULL; | |
2459 | ||
2460 | if (skb->len < sizeof(*hdr)) { | |
2461 | *errp = -EMSGSIZE; | |
2462 | } else { | |
2463 | hdr = (struct sadb_msg *) skb->data; | |
2464 | if (hdr->sadb_msg_version != PF_KEY_V2 || | |
2465 | hdr->sadb_msg_reserved != 0 || | |
2466 | (hdr->sadb_msg_type <= SADB_RESERVED || | |
2467 | hdr->sadb_msg_type > SADB_MAX)) { | |
2468 | hdr = NULL; | |
2469 | *errp = -EINVAL; | |
2470 | } else if (hdr->sadb_msg_len != (skb->len / | |
2471 | sizeof(uint64_t)) || | |
2472 | hdr->sadb_msg_len < (sizeof(struct sadb_msg) / | |
2473 | sizeof(uint64_t))) { | |
2474 | hdr = NULL; | |
2475 | *errp = -EMSGSIZE; | |
2476 | } else { | |
2477 | *errp = 0; | |
2478 | } | |
2479 | } | |
2480 | return hdr; | |
2481 | } | |
2482 | ||
2483 | static inline int aalg_tmpl_set(struct xfrm_tmpl *t, struct xfrm_algo_desc *d) | |
2484 | { | |
2485 | return t->aalgos & (1 << d->desc.sadb_alg_id); | |
2486 | } | |
2487 | ||
2488 | static inline int ealg_tmpl_set(struct xfrm_tmpl *t, struct xfrm_algo_desc *d) | |
2489 | { | |
2490 | return t->ealgos & (1 << d->desc.sadb_alg_id); | |
2491 | } | |
2492 | ||
2493 | static int count_ah_combs(struct xfrm_tmpl *t) | |
2494 | { | |
2495 | int i, sz = 0; | |
2496 | ||
2497 | for (i = 0; ; i++) { | |
2498 | struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); | |
2499 | if (!aalg) | |
2500 | break; | |
2501 | if (aalg_tmpl_set(t, aalg) && aalg->available) | |
2502 | sz += sizeof(struct sadb_comb); | |
2503 | } | |
2504 | return sz + sizeof(struct sadb_prop); | |
2505 | } | |
2506 | ||
2507 | static int count_esp_combs(struct xfrm_tmpl *t) | |
2508 | { | |
2509 | int i, k, sz = 0; | |
2510 | ||
2511 | for (i = 0; ; i++) { | |
2512 | struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); | |
2513 | if (!ealg) | |
2514 | break; | |
2515 | ||
2516 | if (!(ealg_tmpl_set(t, ealg) && ealg->available)) | |
2517 | continue; | |
2518 | ||
2519 | for (k = 1; ; k++) { | |
2520 | struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k); | |
2521 | if (!aalg) | |
2522 | break; | |
2523 | ||
2524 | if (aalg_tmpl_set(t, aalg) && aalg->available) | |
2525 | sz += sizeof(struct sadb_comb); | |
2526 | } | |
2527 | } | |
2528 | return sz + sizeof(struct sadb_prop); | |
2529 | } | |
2530 | ||
2531 | static void dump_ah_combs(struct sk_buff *skb, struct xfrm_tmpl *t) | |
2532 | { | |
2533 | struct sadb_prop *p; | |
2534 | int i; | |
2535 | ||
2536 | p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop)); | |
2537 | p->sadb_prop_len = sizeof(struct sadb_prop)/8; | |
2538 | p->sadb_prop_exttype = SADB_EXT_PROPOSAL; | |
2539 | p->sadb_prop_replay = 32; | |
2540 | memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved)); | |
2541 | ||
2542 | for (i = 0; ; i++) { | |
2543 | struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); | |
2544 | if (!aalg) | |
2545 | break; | |
2546 | ||
2547 | if (aalg_tmpl_set(t, aalg) && aalg->available) { | |
2548 | struct sadb_comb *c; | |
2549 | c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb)); | |
2550 | memset(c, 0, sizeof(*c)); | |
2551 | p->sadb_prop_len += sizeof(struct sadb_comb)/8; | |
2552 | c->sadb_comb_auth = aalg->desc.sadb_alg_id; | |
2553 | c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits; | |
2554 | c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits; | |
2555 | c->sadb_comb_hard_addtime = 24*60*60; | |
2556 | c->sadb_comb_soft_addtime = 20*60*60; | |
2557 | c->sadb_comb_hard_usetime = 8*60*60; | |
2558 | c->sadb_comb_soft_usetime = 7*60*60; | |
2559 | } | |
2560 | } | |
2561 | } | |
2562 | ||
2563 | static void dump_esp_combs(struct sk_buff *skb, struct xfrm_tmpl *t) | |
2564 | { | |
2565 | struct sadb_prop *p; | |
2566 | int i, k; | |
2567 | ||
2568 | p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop)); | |
2569 | p->sadb_prop_len = sizeof(struct sadb_prop)/8; | |
2570 | p->sadb_prop_exttype = SADB_EXT_PROPOSAL; | |
2571 | p->sadb_prop_replay = 32; | |
2572 | memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved)); | |
2573 | ||
2574 | for (i=0; ; i++) { | |
2575 | struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); | |
2576 | if (!ealg) | |
2577 | break; | |
2578 | ||
2579 | if (!(ealg_tmpl_set(t, ealg) && ealg->available)) | |
2580 | continue; | |
2581 | ||
2582 | for (k = 1; ; k++) { | |
2583 | struct sadb_comb *c; | |
2584 | struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k); | |
2585 | if (!aalg) | |
2586 | break; | |
2587 | if (!(aalg_tmpl_set(t, aalg) && aalg->available)) | |
2588 | continue; | |
2589 | c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb)); | |
2590 | memset(c, 0, sizeof(*c)); | |
2591 | p->sadb_prop_len += sizeof(struct sadb_comb)/8; | |
2592 | c->sadb_comb_auth = aalg->desc.sadb_alg_id; | |
2593 | c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits; | |
2594 | c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits; | |
2595 | c->sadb_comb_encrypt = ealg->desc.sadb_alg_id; | |
2596 | c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits; | |
2597 | c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits; | |
2598 | c->sadb_comb_hard_addtime = 24*60*60; | |
2599 | c->sadb_comb_soft_addtime = 20*60*60; | |
2600 | c->sadb_comb_hard_usetime = 8*60*60; | |
2601 | c->sadb_comb_soft_usetime = 7*60*60; | |
2602 | } | |
2603 | } | |
2604 | } | |
2605 | ||
26b15dad JHS |
2606 | static int key_notify_policy_expire(struct xfrm_policy *xp, struct km_event *c) |
2607 | { | |
2608 | return 0; | |
2609 | } | |
2610 | ||
2611 | static int key_notify_sa_expire(struct xfrm_state *x, struct km_event *c) | |
1da177e4 LT |
2612 | { |
2613 | struct sk_buff *out_skb; | |
2614 | struct sadb_msg *out_hdr; | |
26b15dad JHS |
2615 | int hard; |
2616 | int hsc; | |
2617 | ||
bf08867f | 2618 | hard = c->data.hard; |
26b15dad JHS |
2619 | if (hard) |
2620 | hsc = 2; | |
2621 | else | |
2622 | hsc = 1; | |
1da177e4 LT |
2623 | |
2624 | out_skb = pfkey_xfrm_state2msg(x, 0, hsc); | |
2625 | if (IS_ERR(out_skb)) | |
2626 | return PTR_ERR(out_skb); | |
2627 | ||
2628 | out_hdr = (struct sadb_msg *) out_skb->data; | |
2629 | out_hdr->sadb_msg_version = PF_KEY_V2; | |
2630 | out_hdr->sadb_msg_type = SADB_EXPIRE; | |
2631 | out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); | |
2632 | out_hdr->sadb_msg_errno = 0; | |
2633 | out_hdr->sadb_msg_reserved = 0; | |
2634 | out_hdr->sadb_msg_seq = 0; | |
2635 | out_hdr->sadb_msg_pid = 0; | |
2636 | ||
2637 | pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL); | |
2638 | return 0; | |
2639 | } | |
2640 | ||
26b15dad JHS |
2641 | static int pfkey_send_notify(struct xfrm_state *x, struct km_event *c) |
2642 | { | |
2643 | switch (c->event) { | |
f60f6b8f | 2644 | case XFRM_MSG_EXPIRE: |
26b15dad | 2645 | return key_notify_sa_expire(x, c); |
f60f6b8f HX |
2646 | case XFRM_MSG_DELSA: |
2647 | case XFRM_MSG_NEWSA: | |
2648 | case XFRM_MSG_UPDSA: | |
26b15dad | 2649 | return key_notify_sa(x, c); |
f60f6b8f | 2650 | case XFRM_MSG_FLUSHSA: |
26b15dad JHS |
2651 | return key_notify_sa_flush(c); |
2652 | default: | |
2653 | printk("pfkey: Unknown SA event %d\n", c->event); | |
2654 | break; | |
2655 | } | |
2656 | ||
2657 | return 0; | |
2658 | } | |
2659 | ||
2660 | static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c) | |
2661 | { | |
2662 | switch (c->event) { | |
f60f6b8f | 2663 | case XFRM_MSG_POLEXPIRE: |
26b15dad | 2664 | return key_notify_policy_expire(xp, c); |
f60f6b8f HX |
2665 | case XFRM_MSG_DELPOLICY: |
2666 | case XFRM_MSG_NEWPOLICY: | |
2667 | case XFRM_MSG_UPDPOLICY: | |
26b15dad | 2668 | return key_notify_policy(xp, dir, c); |
f60f6b8f | 2669 | case XFRM_MSG_FLUSHPOLICY: |
26b15dad JHS |
2670 | return key_notify_policy_flush(c); |
2671 | default: | |
2672 | printk("pfkey: Unknown policy event %d\n", c->event); | |
2673 | break; | |
2674 | } | |
2675 | ||
2676 | return 0; | |
2677 | } | |
2678 | ||
1da177e4 LT |
2679 | static u32 get_acqseq(void) |
2680 | { | |
2681 | u32 res; | |
2682 | static u32 acqseq; | |
2683 | static DEFINE_SPINLOCK(acqseq_lock); | |
2684 | ||
2685 | spin_lock_bh(&acqseq_lock); | |
2686 | res = (++acqseq ? : ++acqseq); | |
2687 | spin_unlock_bh(&acqseq_lock); | |
2688 | return res; | |
2689 | } | |
2690 | ||
2691 | static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp, int dir) | |
2692 | { | |
2693 | struct sk_buff *skb; | |
2694 | struct sadb_msg *hdr; | |
2695 | struct sadb_address *addr; | |
2696 | struct sadb_x_policy *pol; | |
2697 | struct sockaddr_in *sin; | |
2698 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
2699 | struct sockaddr_in6 *sin6; | |
2700 | #endif | |
2701 | int sockaddr_size; | |
2702 | int size; | |
2703 | ||
2704 | sockaddr_size = pfkey_sockaddr_size(x->props.family); | |
2705 | if (!sockaddr_size) | |
2706 | return -EINVAL; | |
2707 | ||
2708 | size = sizeof(struct sadb_msg) + | |
2709 | (sizeof(struct sadb_address) * 2) + | |
2710 | (sockaddr_size * 2) + | |
2711 | sizeof(struct sadb_x_policy); | |
2712 | ||
2713 | if (x->id.proto == IPPROTO_AH) | |
2714 | size += count_ah_combs(t); | |
2715 | else if (x->id.proto == IPPROTO_ESP) | |
2716 | size += count_esp_combs(t); | |
2717 | ||
2718 | skb = alloc_skb(size + 16, GFP_ATOMIC); | |
2719 | if (skb == NULL) | |
2720 | return -ENOMEM; | |
2721 | ||
2722 | hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); | |
2723 | hdr->sadb_msg_version = PF_KEY_V2; | |
2724 | hdr->sadb_msg_type = SADB_ACQUIRE; | |
2725 | hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); | |
2726 | hdr->sadb_msg_len = size / sizeof(uint64_t); | |
2727 | hdr->sadb_msg_errno = 0; | |
2728 | hdr->sadb_msg_reserved = 0; | |
2729 | hdr->sadb_msg_seq = x->km.seq = get_acqseq(); | |
2730 | hdr->sadb_msg_pid = 0; | |
2731 | ||
2732 | /* src address */ | |
2733 | addr = (struct sadb_address*) skb_put(skb, | |
2734 | sizeof(struct sadb_address)+sockaddr_size); | |
2735 | addr->sadb_address_len = | |
2736 | (sizeof(struct sadb_address)+sockaddr_size)/ | |
2737 | sizeof(uint64_t); | |
2738 | addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; | |
2739 | addr->sadb_address_proto = 0; | |
2740 | addr->sadb_address_reserved = 0; | |
2741 | if (x->props.family == AF_INET) { | |
2742 | addr->sadb_address_prefixlen = 32; | |
2743 | ||
2744 | sin = (struct sockaddr_in *) (addr + 1); | |
2745 | sin->sin_family = AF_INET; | |
2746 | sin->sin_addr.s_addr = x->props.saddr.a4; | |
2747 | sin->sin_port = 0; | |
2748 | memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
2749 | } | |
2750 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
2751 | else if (x->props.family == AF_INET6) { | |
2752 | addr->sadb_address_prefixlen = 128; | |
2753 | ||
2754 | sin6 = (struct sockaddr_in6 *) (addr + 1); | |
2755 | sin6->sin6_family = AF_INET6; | |
2756 | sin6->sin6_port = 0; | |
2757 | sin6->sin6_flowinfo = 0; | |
2758 | memcpy(&sin6->sin6_addr, | |
2759 | x->props.saddr.a6, sizeof(struct in6_addr)); | |
2760 | sin6->sin6_scope_id = 0; | |
2761 | } | |
2762 | #endif | |
2763 | else | |
2764 | BUG(); | |
2765 | ||
2766 | /* dst address */ | |
2767 | addr = (struct sadb_address*) skb_put(skb, | |
2768 | sizeof(struct sadb_address)+sockaddr_size); | |
2769 | addr->sadb_address_len = | |
2770 | (sizeof(struct sadb_address)+sockaddr_size)/ | |
2771 | sizeof(uint64_t); | |
2772 | addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; | |
2773 | addr->sadb_address_proto = 0; | |
2774 | addr->sadb_address_reserved = 0; | |
2775 | if (x->props.family == AF_INET) { | |
2776 | addr->sadb_address_prefixlen = 32; | |
2777 | ||
2778 | sin = (struct sockaddr_in *) (addr + 1); | |
2779 | sin->sin_family = AF_INET; | |
2780 | sin->sin_addr.s_addr = x->id.daddr.a4; | |
2781 | sin->sin_port = 0; | |
2782 | memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
2783 | } | |
2784 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
2785 | else if (x->props.family == AF_INET6) { | |
2786 | addr->sadb_address_prefixlen = 128; | |
2787 | ||
2788 | sin6 = (struct sockaddr_in6 *) (addr + 1); | |
2789 | sin6->sin6_family = AF_INET6; | |
2790 | sin6->sin6_port = 0; | |
2791 | sin6->sin6_flowinfo = 0; | |
2792 | memcpy(&sin6->sin6_addr, | |
2793 | x->id.daddr.a6, sizeof(struct in6_addr)); | |
2794 | sin6->sin6_scope_id = 0; | |
2795 | } | |
2796 | #endif | |
2797 | else | |
2798 | BUG(); | |
2799 | ||
2800 | pol = (struct sadb_x_policy *) skb_put(skb, sizeof(struct sadb_x_policy)); | |
2801 | pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t); | |
2802 | pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; | |
2803 | pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; | |
2804 | pol->sadb_x_policy_dir = dir+1; | |
2805 | pol->sadb_x_policy_id = xp->index; | |
2806 | ||
2807 | /* Set sadb_comb's. */ | |
2808 | if (x->id.proto == IPPROTO_AH) | |
2809 | dump_ah_combs(skb, t); | |
2810 | else if (x->id.proto == IPPROTO_ESP) | |
2811 | dump_esp_combs(skb, t); | |
2812 | ||
2813 | return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL); | |
2814 | } | |
2815 | ||
2816 | static struct xfrm_policy *pfkey_compile_policy(u16 family, int opt, | |
2817 | u8 *data, int len, int *dir) | |
2818 | { | |
2819 | struct xfrm_policy *xp; | |
2820 | struct sadb_x_policy *pol = (struct sadb_x_policy*)data; | |
df71837d | 2821 | struct sadb_x_sec_ctx *sec_ctx; |
1da177e4 LT |
2822 | |
2823 | switch (family) { | |
2824 | case AF_INET: | |
2825 | if (opt != IP_IPSEC_POLICY) { | |
2826 | *dir = -EOPNOTSUPP; | |
2827 | return NULL; | |
2828 | } | |
2829 | break; | |
2830 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
2831 | case AF_INET6: | |
2832 | if (opt != IPV6_IPSEC_POLICY) { | |
2833 | *dir = -EOPNOTSUPP; | |
2834 | return NULL; | |
2835 | } | |
2836 | break; | |
2837 | #endif | |
2838 | default: | |
2839 | *dir = -EINVAL; | |
2840 | return NULL; | |
2841 | } | |
2842 | ||
2843 | *dir = -EINVAL; | |
2844 | ||
2845 | if (len < sizeof(struct sadb_x_policy) || | |
2846 | pol->sadb_x_policy_len*8 > len || | |
2847 | pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS || | |
2848 | (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND)) | |
2849 | return NULL; | |
2850 | ||
2851 | xp = xfrm_policy_alloc(GFP_ATOMIC); | |
2852 | if (xp == NULL) { | |
2853 | *dir = -ENOBUFS; | |
2854 | return NULL; | |
2855 | } | |
2856 | ||
2857 | xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ? | |
2858 | XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW); | |
2859 | ||
2860 | xp->lft.soft_byte_limit = XFRM_INF; | |
2861 | xp->lft.hard_byte_limit = XFRM_INF; | |
2862 | xp->lft.soft_packet_limit = XFRM_INF; | |
2863 | xp->lft.hard_packet_limit = XFRM_INF; | |
2864 | xp->family = family; | |
2865 | ||
2866 | xp->xfrm_nr = 0; | |
2867 | if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC && | |
2868 | (*dir = parse_ipsecrequests(xp, pol)) < 0) | |
2869 | goto out; | |
2870 | ||
df71837d TJ |
2871 | /* security context too */ |
2872 | if (len >= (pol->sadb_x_policy_len*8 + | |
2873 | sizeof(struct sadb_x_sec_ctx))) { | |
2874 | char *p = (char *)pol; | |
2875 | struct xfrm_user_sec_ctx *uctx; | |
2876 | ||
2877 | p += pol->sadb_x_policy_len*8; | |
2878 | sec_ctx = (struct sadb_x_sec_ctx *)p; | |
2879 | if (len < pol->sadb_x_policy_len*8 + | |
2880 | sec_ctx->sadb_x_sec_len) | |
2881 | goto out; | |
2882 | if ((*dir = verify_sec_ctx_len(p))) | |
2883 | goto out; | |
2884 | uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx); | |
2885 | *dir = security_xfrm_policy_alloc(xp, uctx); | |
2886 | kfree(uctx); | |
2887 | ||
2888 | if (*dir) | |
2889 | goto out; | |
2890 | } | |
2891 | ||
1da177e4 LT |
2892 | *dir = pol->sadb_x_policy_dir-1; |
2893 | return xp; | |
2894 | ||
2895 | out: | |
df71837d | 2896 | security_xfrm_policy_free(xp); |
1da177e4 LT |
2897 | kfree(xp); |
2898 | return NULL; | |
2899 | } | |
2900 | ||
2901 | static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport) | |
2902 | { | |
2903 | struct sk_buff *skb; | |
2904 | struct sadb_msg *hdr; | |
2905 | struct sadb_sa *sa; | |
2906 | struct sadb_address *addr; | |
2907 | struct sadb_x_nat_t_port *n_port; | |
2908 | struct sockaddr_in *sin; | |
2909 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
2910 | struct sockaddr_in6 *sin6; | |
2911 | #endif | |
2912 | int sockaddr_size; | |
2913 | int size; | |
2914 | __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0); | |
2915 | struct xfrm_encap_tmpl *natt = NULL; | |
2916 | ||
2917 | sockaddr_size = pfkey_sockaddr_size(x->props.family); | |
2918 | if (!sockaddr_size) | |
2919 | return -EINVAL; | |
2920 | ||
2921 | if (!satype) | |
2922 | return -EINVAL; | |
2923 | ||
2924 | if (!x->encap) | |
2925 | return -EINVAL; | |
2926 | ||
2927 | natt = x->encap; | |
2928 | ||
2929 | /* Build an SADB_X_NAT_T_NEW_MAPPING message: | |
2930 | * | |
2931 | * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) | | |
2932 | * ADDRESS_DST (new addr) | NAT_T_DPORT (new port) | |
2933 | */ | |
2934 | ||
2935 | size = sizeof(struct sadb_msg) + | |
2936 | sizeof(struct sadb_sa) + | |
2937 | (sizeof(struct sadb_address) * 2) + | |
2938 | (sockaddr_size * 2) + | |
2939 | (sizeof(struct sadb_x_nat_t_port) * 2); | |
2940 | ||
2941 | skb = alloc_skb(size + 16, GFP_ATOMIC); | |
2942 | if (skb == NULL) | |
2943 | return -ENOMEM; | |
2944 | ||
2945 | hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); | |
2946 | hdr->sadb_msg_version = PF_KEY_V2; | |
2947 | hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING; | |
2948 | hdr->sadb_msg_satype = satype; | |
2949 | hdr->sadb_msg_len = size / sizeof(uint64_t); | |
2950 | hdr->sadb_msg_errno = 0; | |
2951 | hdr->sadb_msg_reserved = 0; | |
2952 | hdr->sadb_msg_seq = x->km.seq = get_acqseq(); | |
2953 | hdr->sadb_msg_pid = 0; | |
2954 | ||
2955 | /* SA */ | |
2956 | sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa)); | |
2957 | sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t); | |
2958 | sa->sadb_sa_exttype = SADB_EXT_SA; | |
2959 | sa->sadb_sa_spi = x->id.spi; | |
2960 | sa->sadb_sa_replay = 0; | |
2961 | sa->sadb_sa_state = 0; | |
2962 | sa->sadb_sa_auth = 0; | |
2963 | sa->sadb_sa_encrypt = 0; | |
2964 | sa->sadb_sa_flags = 0; | |
2965 | ||
2966 | /* ADDRESS_SRC (old addr) */ | |
2967 | addr = (struct sadb_address*) | |
2968 | skb_put(skb, sizeof(struct sadb_address)+sockaddr_size); | |
2969 | addr->sadb_address_len = | |
2970 | (sizeof(struct sadb_address)+sockaddr_size)/ | |
2971 | sizeof(uint64_t); | |
2972 | addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; | |
2973 | addr->sadb_address_proto = 0; | |
2974 | addr->sadb_address_reserved = 0; | |
2975 | if (x->props.family == AF_INET) { | |
2976 | addr->sadb_address_prefixlen = 32; | |
2977 | ||
2978 | sin = (struct sockaddr_in *) (addr + 1); | |
2979 | sin->sin_family = AF_INET; | |
2980 | sin->sin_addr.s_addr = x->props.saddr.a4; | |
2981 | sin->sin_port = 0; | |
2982 | memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
2983 | } | |
2984 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
2985 | else if (x->props.family == AF_INET6) { | |
2986 | addr->sadb_address_prefixlen = 128; | |
2987 | ||
2988 | sin6 = (struct sockaddr_in6 *) (addr + 1); | |
2989 | sin6->sin6_family = AF_INET6; | |
2990 | sin6->sin6_port = 0; | |
2991 | sin6->sin6_flowinfo = 0; | |
2992 | memcpy(&sin6->sin6_addr, | |
2993 | x->props.saddr.a6, sizeof(struct in6_addr)); | |
2994 | sin6->sin6_scope_id = 0; | |
2995 | } | |
2996 | #endif | |
2997 | else | |
2998 | BUG(); | |
2999 | ||
3000 | /* NAT_T_SPORT (old port) */ | |
3001 | n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port)); | |
3002 | n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); | |
3003 | n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT; | |
3004 | n_port->sadb_x_nat_t_port_port = natt->encap_sport; | |
3005 | n_port->sadb_x_nat_t_port_reserved = 0; | |
3006 | ||
3007 | /* ADDRESS_DST (new addr) */ | |
3008 | addr = (struct sadb_address*) | |
3009 | skb_put(skb, sizeof(struct sadb_address)+sockaddr_size); | |
3010 | addr->sadb_address_len = | |
3011 | (sizeof(struct sadb_address)+sockaddr_size)/ | |
3012 | sizeof(uint64_t); | |
3013 | addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; | |
3014 | addr->sadb_address_proto = 0; | |
3015 | addr->sadb_address_reserved = 0; | |
3016 | if (x->props.family == AF_INET) { | |
3017 | addr->sadb_address_prefixlen = 32; | |
3018 | ||
3019 | sin = (struct sockaddr_in *) (addr + 1); | |
3020 | sin->sin_family = AF_INET; | |
3021 | sin->sin_addr.s_addr = ipaddr->a4; | |
3022 | sin->sin_port = 0; | |
3023 | memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
3024 | } | |
3025 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
3026 | else if (x->props.family == AF_INET6) { | |
3027 | addr->sadb_address_prefixlen = 128; | |
3028 | ||
3029 | sin6 = (struct sockaddr_in6 *) (addr + 1); | |
3030 | sin6->sin6_family = AF_INET6; | |
3031 | sin6->sin6_port = 0; | |
3032 | sin6->sin6_flowinfo = 0; | |
3033 | memcpy(&sin6->sin6_addr, &ipaddr->a6, sizeof(struct in6_addr)); | |
3034 | sin6->sin6_scope_id = 0; | |
3035 | } | |
3036 | #endif | |
3037 | else | |
3038 | BUG(); | |
3039 | ||
3040 | /* NAT_T_DPORT (new port) */ | |
3041 | n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port)); | |
3042 | n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); | |
3043 | n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT; | |
3044 | n_port->sadb_x_nat_t_port_port = sport; | |
3045 | n_port->sadb_x_nat_t_port_reserved = 0; | |
3046 | ||
3047 | return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL); | |
3048 | } | |
3049 | ||
3050 | static int pfkey_sendmsg(struct kiocb *kiocb, | |
3051 | struct socket *sock, struct msghdr *msg, size_t len) | |
3052 | { | |
3053 | struct sock *sk = sock->sk; | |
3054 | struct sk_buff *skb = NULL; | |
3055 | struct sadb_msg *hdr = NULL; | |
3056 | int err; | |
3057 | ||
3058 | err = -EOPNOTSUPP; | |
3059 | if (msg->msg_flags & MSG_OOB) | |
3060 | goto out; | |
3061 | ||
3062 | err = -EMSGSIZE; | |
3063 | if ((unsigned)len > sk->sk_sndbuf - 32) | |
3064 | goto out; | |
3065 | ||
3066 | err = -ENOBUFS; | |
3067 | skb = alloc_skb(len, GFP_KERNEL); | |
3068 | if (skb == NULL) | |
3069 | goto out; | |
3070 | ||
3071 | err = -EFAULT; | |
3072 | if (memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len)) | |
3073 | goto out; | |
3074 | ||
3075 | hdr = pfkey_get_base_msg(skb, &err); | |
3076 | if (!hdr) | |
3077 | goto out; | |
3078 | ||
3079 | down(&xfrm_cfg_sem); | |
3080 | err = pfkey_process(sk, skb, hdr); | |
3081 | up(&xfrm_cfg_sem); | |
3082 | ||
3083 | out: | |
3084 | if (err && hdr && pfkey_error(hdr, err, sk) == 0) | |
3085 | err = 0; | |
3086 | if (skb) | |
3087 | kfree_skb(skb); | |
3088 | ||
3089 | return err ? : len; | |
3090 | } | |
3091 | ||
3092 | static int pfkey_recvmsg(struct kiocb *kiocb, | |
3093 | struct socket *sock, struct msghdr *msg, size_t len, | |
3094 | int flags) | |
3095 | { | |
3096 | struct sock *sk = sock->sk; | |
3097 | struct sk_buff *skb; | |
3098 | int copied, err; | |
3099 | ||
3100 | err = -EINVAL; | |
3101 | if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT)) | |
3102 | goto out; | |
3103 | ||
3104 | msg->msg_namelen = 0; | |
3105 | skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err); | |
3106 | if (skb == NULL) | |
3107 | goto out; | |
3108 | ||
3109 | copied = skb->len; | |
3110 | if (copied > len) { | |
3111 | msg->msg_flags |= MSG_TRUNC; | |
3112 | copied = len; | |
3113 | } | |
3114 | ||
3115 | skb->h.raw = skb->data; | |
3116 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
3117 | if (err) | |
3118 | goto out_free; | |
3119 | ||
3120 | sock_recv_timestamp(msg, sk, skb); | |
3121 | ||
3122 | err = (flags & MSG_TRUNC) ? skb->len : copied; | |
3123 | ||
3124 | out_free: | |
3125 | skb_free_datagram(sk, skb); | |
3126 | out: | |
3127 | return err; | |
3128 | } | |
3129 | ||
90ddc4f0 | 3130 | static const struct proto_ops pfkey_ops = { |
1da177e4 LT |
3131 | .family = PF_KEY, |
3132 | .owner = THIS_MODULE, | |
3133 | /* Operations that make no sense on pfkey sockets. */ | |
3134 | .bind = sock_no_bind, | |
3135 | .connect = sock_no_connect, | |
3136 | .socketpair = sock_no_socketpair, | |
3137 | .accept = sock_no_accept, | |
3138 | .getname = sock_no_getname, | |
3139 | .ioctl = sock_no_ioctl, | |
3140 | .listen = sock_no_listen, | |
3141 | .shutdown = sock_no_shutdown, | |
3142 | .setsockopt = sock_no_setsockopt, | |
3143 | .getsockopt = sock_no_getsockopt, | |
3144 | .mmap = sock_no_mmap, | |
3145 | .sendpage = sock_no_sendpage, | |
3146 | ||
3147 | /* Now the operations that really occur. */ | |
3148 | .release = pfkey_release, | |
3149 | .poll = datagram_poll, | |
3150 | .sendmsg = pfkey_sendmsg, | |
3151 | .recvmsg = pfkey_recvmsg, | |
3152 | }; | |
3153 | ||
3154 | static struct net_proto_family pfkey_family_ops = { | |
3155 | .family = PF_KEY, | |
3156 | .create = pfkey_create, | |
3157 | .owner = THIS_MODULE, | |
3158 | }; | |
3159 | ||
3160 | #ifdef CONFIG_PROC_FS | |
3161 | static int pfkey_read_proc(char *buffer, char **start, off_t offset, | |
3162 | int length, int *eof, void *data) | |
3163 | { | |
3164 | off_t pos = 0; | |
3165 | off_t begin = 0; | |
3166 | int len = 0; | |
3167 | struct sock *s; | |
3168 | struct hlist_node *node; | |
3169 | ||
3170 | len += sprintf(buffer,"sk RefCnt Rmem Wmem User Inode\n"); | |
3171 | ||
3172 | read_lock(&pfkey_table_lock); | |
3173 | ||
3174 | sk_for_each(s, node, &pfkey_table) { | |
3175 | len += sprintf(buffer+len,"%p %-6d %-6u %-6u %-6u %-6lu", | |
3176 | s, | |
3177 | atomic_read(&s->sk_refcnt), | |
3178 | atomic_read(&s->sk_rmem_alloc), | |
3179 | atomic_read(&s->sk_wmem_alloc), | |
3180 | sock_i_uid(s), | |
3181 | sock_i_ino(s) | |
3182 | ); | |
3183 | ||
3184 | buffer[len++] = '\n'; | |
3185 | ||
3186 | pos = begin + len; | |
3187 | if (pos < offset) { | |
3188 | len = 0; | |
3189 | begin = pos; | |
3190 | } | |
3191 | if(pos > offset + length) | |
3192 | goto done; | |
3193 | } | |
3194 | *eof = 1; | |
3195 | ||
3196 | done: | |
3197 | read_unlock(&pfkey_table_lock); | |
3198 | ||
3199 | *start = buffer + (offset - begin); | |
3200 | len -= (offset - begin); | |
3201 | ||
3202 | if (len > length) | |
3203 | len = length; | |
3204 | if (len < 0) | |
3205 | len = 0; | |
3206 | ||
3207 | return len; | |
3208 | } | |
3209 | #endif | |
3210 | ||
3211 | static struct xfrm_mgr pfkeyv2_mgr = | |
3212 | { | |
3213 | .id = "pfkeyv2", | |
3214 | .notify = pfkey_send_notify, | |
3215 | .acquire = pfkey_send_acquire, | |
3216 | .compile_policy = pfkey_compile_policy, | |
3217 | .new_mapping = pfkey_send_new_mapping, | |
26b15dad | 3218 | .notify_policy = pfkey_send_policy_notify, |
1da177e4 LT |
3219 | }; |
3220 | ||
3221 | static void __exit ipsec_pfkey_exit(void) | |
3222 | { | |
3223 | xfrm_unregister_km(&pfkeyv2_mgr); | |
3224 | remove_proc_entry("net/pfkey", NULL); | |
3225 | sock_unregister(PF_KEY); | |
3226 | proto_unregister(&key_proto); | |
3227 | } | |
3228 | ||
3229 | static int __init ipsec_pfkey_init(void) | |
3230 | { | |
3231 | int err = proto_register(&key_proto, 0); | |
3232 | ||
3233 | if (err != 0) | |
3234 | goto out; | |
3235 | ||
3236 | err = sock_register(&pfkey_family_ops); | |
3237 | if (err != 0) | |
3238 | goto out_unregister_key_proto; | |
3239 | #ifdef CONFIG_PROC_FS | |
3240 | err = -ENOMEM; | |
3241 | if (create_proc_read_entry("net/pfkey", 0, NULL, pfkey_read_proc, NULL) == NULL) | |
3242 | goto out_sock_unregister; | |
3243 | #endif | |
3244 | err = xfrm_register_km(&pfkeyv2_mgr); | |
3245 | if (err != 0) | |
3246 | goto out_remove_proc_entry; | |
3247 | out: | |
3248 | return err; | |
3249 | out_remove_proc_entry: | |
3250 | #ifdef CONFIG_PROC_FS | |
3251 | remove_proc_entry("net/pfkey", NULL); | |
3252 | out_sock_unregister: | |
3253 | #endif | |
3254 | sock_unregister(PF_KEY); | |
3255 | out_unregister_key_proto: | |
3256 | proto_unregister(&key_proto); | |
3257 | goto out; | |
3258 | } | |
3259 | ||
3260 | module_init(ipsec_pfkey_init); | |
3261 | module_exit(ipsec_pfkey_exit); | |
3262 | MODULE_LICENSE("GPL"); | |
3263 | MODULE_ALIAS_NETPROTO(PF_KEY); |