1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * net/key/af_key.c An implementation of PF_KEYv2 sockets. |
4 | * |
5 | * Authors: Maxim Giryaev <gem@asplinux.ru> |
6 | * David S. Miller <davem@redhat.com> |
7 | * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> |
8 | * Kunihiro Ishiguro <kunihiro@ipinfusion.com> |
9 | * Kazunori MIYAZAWA / USAGI Project <miyazawa@linux-ipv6.org> |
10 | * Derek Atkins <derek@ihtfp.com> |
11 | */ |
12 | |
13 | #include <linux/capability.h> |
14 | #include <linux/module.h> |
15 | #include <linux/kernel.h> |
16 | #include <linux/socket.h> |
17 | #include <linux/pfkeyv2.h> |
18 | #include <linux/ipsec.h> |
19 | #include <linux/skbuff.h> |
20 | #include <linux/rtnetlink.h> |
21 | #include <linux/in.h> |
22 | #include <linux/in6.h> |
23 | #include <linux/proc_fs.h> |
24 | #include <linux/init.h> |
25 | #include <linux/slab.h> |
26 | #include <net/net_namespace.h> |
27 | #include <net/netns/generic.h> |
28 | #include <net/xfrm.h> |
29 | |
30 | #include <net/sock.h> |
31 | |
32 | #define _X2KEY(x) ((x) == XFRM_INF ? 0 : (x)) |
33 | #define _KEY2X(x) ((x) == 0 ? XFRM_INF : (x)) |
34 | |
35 | static unsigned int pfkey_net_id __read_mostly; |
36 | struct netns_pfkey { |
37 | /* List of all pfkey sockets. */ |
38 | struct hlist_head table; |
39 | atomic_t socks_nr; |
40 | }; |
41 | static DEFINE_MUTEX(pfkey_mutex); |
42 | |
43 | #define DUMMY_MARK 0 |
44 | static const struct xfrm_mark dummy_mark = {0, 0}; |
45 | struct pfkey_sock { |
46 | /* struct sock must be the first member of struct pfkey_sock */ |
47 | struct sock sk; |
48 | int registered; |
49 | int promisc; |
50 | |
51 | struct { |
52 | uint8_t msg_version; |
53 | uint32_t msg_portid; |
54 | int (*dump)(struct pfkey_sock *sk); |
55 | void (*done)(struct pfkey_sock *sk); |
56 | union { |
57 | struct xfrm_policy_walk policy; |
58 | struct xfrm_state_walk state; |
59 | } u; |
60 | struct sk_buff *skb; |
61 | } dump; |
62 | struct mutex dump_lock; |
63 | }; |
64 | |
65 | static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len, |
66 | xfrm_address_t *saddr, xfrm_address_t *daddr, |
67 | u16 *family); |
68 | |
69 | static inline struct pfkey_sock *pfkey_sk(struct sock *sk) |
70 | { |
71 | return (struct pfkey_sock *)sk; |
72 | } |
73 | |
74 | static int pfkey_can_dump(const struct sock *sk) |
75 | { |
76 | if (3 * atomic_read(v: &sk->sk_rmem_alloc) <= 2 * sk->sk_rcvbuf) |
77 | return 1; |
78 | return 0; |
79 | } |
80 | |
81 | static void pfkey_terminate_dump(struct pfkey_sock *pfk) |
82 | { |
83 | if (pfk->dump.dump) { |
84 | if (pfk->dump.skb) { |
85 | kfree_skb(skb: pfk->dump.skb); |
86 | pfk->dump.skb = NULL; |
87 | } |
88 | pfk->dump.done(pfk); |
89 | pfk->dump.dump = NULL; |
90 | pfk->dump.done = NULL; |
91 | } |
92 | } |
93 | |
94 | static void pfkey_sock_destruct(struct sock *sk) |
95 | { |
96 | struct net *net = sock_net(sk); |
97 | struct netns_pfkey *net_pfkey = net_generic(net, id: pfkey_net_id); |
98 | |
99 | pfkey_terminate_dump(pfk: pfkey_sk(sk)); |
100 | skb_queue_purge(list: &sk->sk_receive_queue); |
101 | |
102 | if (!sock_flag(sk, flag: SOCK_DEAD)) { |
103 | pr_err("Attempt to release alive pfkey socket: %p\n" , sk); |
104 | return; |
105 | } |
106 | |
107 | WARN_ON(atomic_read(&sk->sk_rmem_alloc)); |
108 | WARN_ON(refcount_read(&sk->sk_wmem_alloc)); |
109 | |
110 | atomic_dec(v: &net_pfkey->socks_nr); |
111 | } |
112 | |
113 | static const struct proto_ops pfkey_ops; |
114 | |
115 | static void pfkey_insert(struct sock *sk) |
116 | { |
117 | struct net *net = sock_net(sk); |
118 | struct netns_pfkey *net_pfkey = net_generic(net, id: pfkey_net_id); |
119 | |
120 | mutex_lock(&pfkey_mutex); |
121 | sk_add_node_rcu(sk, list: &net_pfkey->table); |
122 | mutex_unlock(lock: &pfkey_mutex); |
123 | } |
124 | |
125 | static void pfkey_remove(struct sock *sk) |
126 | { |
127 | mutex_lock(&pfkey_mutex); |
128 | sk_del_node_init_rcu(sk); |
129 | mutex_unlock(lock: &pfkey_mutex); |
130 | } |
131 | |
132 | static struct proto key_proto = { |
133 | .name = "KEY" , |
134 | .owner = THIS_MODULE, |
135 | .obj_size = sizeof(struct pfkey_sock), |
136 | }; |
137 | |
138 | static int pfkey_create(struct net *net, struct socket *sock, int protocol, |
139 | int kern) |
140 | { |
141 | struct netns_pfkey *net_pfkey = net_generic(net, id: pfkey_net_id); |
142 | struct sock *sk; |
143 | struct pfkey_sock *pfk; |
144 | |
145 | if (!ns_capable(ns: net->user_ns, CAP_NET_ADMIN)) |
146 | return -EPERM; |
147 | if (sock->type != SOCK_RAW) |
148 | return -ESOCKTNOSUPPORT; |
149 | if (protocol != PF_KEY_V2) |
150 | return -EPROTONOSUPPORT; |
151 | |
152 | sk = sk_alloc(net, PF_KEY, GFP_KERNEL, prot: &key_proto, kern); |
153 | if (sk == NULL) |
154 | return -ENOMEM; |
155 | |
156 | pfk = pfkey_sk(sk); |
157 | mutex_init(&pfk->dump_lock); |
158 | |
159 | sock->ops = &pfkey_ops; |
160 | sock_init_data(sock, sk); |
161 | |
162 | sk->sk_family = PF_KEY; |
163 | sk->sk_destruct = pfkey_sock_destruct; |
164 | |
165 | atomic_inc(v: &net_pfkey->socks_nr); |
166 | |
167 | pfkey_insert(sk); |
168 | |
169 | return 0; |
170 | } |
171 | |
172 | static int pfkey_release(struct socket *sock) |
173 | { |
174 | struct sock *sk = sock->sk; |
175 | |
176 | if (!sk) |
177 | return 0; |
178 | |
179 | pfkey_remove(sk); |
180 | |
181 | sock_orphan(sk); |
182 | sock->sk = NULL; |
183 | skb_queue_purge(list: &sk->sk_write_queue); |
184 | |
185 | synchronize_rcu(); |
186 | sock_put(sk); |
187 | |
188 | return 0; |
189 | } |
190 | |
191 | static int pfkey_broadcast_one(struct sk_buff *skb, gfp_t allocation, |
192 | struct sock *sk) |
193 | { |
194 | int err = -ENOBUFS; |
195 | |
196 | if (atomic_read(v: &sk->sk_rmem_alloc) > sk->sk_rcvbuf) |
197 | return err; |
198 | |
199 | skb = skb_clone(skb, priority: allocation); |
200 | |
201 | if (skb) { |
202 | skb_set_owner_r(skb, sk); |
203 | skb_queue_tail(list: &sk->sk_receive_queue, newsk: skb); |
204 | sk->sk_data_ready(sk); |
205 | err = 0; |
206 | } |
207 | return err; |
208 | } |
209 | |
210 | /* Send SKB to all pfkey sockets matching selected criteria. */ |
211 | #define BROADCAST_ALL 0 |
212 | #define BROADCAST_ONE 1 |
213 | #define BROADCAST_REGISTERED 2 |
214 | #define BROADCAST_PROMISC_ONLY 4 |
215 | static int pfkey_broadcast(struct sk_buff *skb, gfp_t allocation, |
216 | int broadcast_flags, struct sock *one_sk, |
217 | struct net *net) |
218 | { |
219 | struct netns_pfkey *net_pfkey = net_generic(net, id: pfkey_net_id); |
220 | struct sock *sk; |
221 | int err = -ESRCH; |
222 | |
223 | /* XXX Do we need something like netlink_overrun? I think |
224 | * XXX PF_KEY socket apps will not mind current behavior. |
225 | */ |
226 | if (!skb) |
227 | return -ENOMEM; |
228 | |
229 | rcu_read_lock(); |
230 | sk_for_each_rcu(sk, &net_pfkey->table) { |
231 | struct pfkey_sock *pfk = pfkey_sk(sk); |
232 | int err2; |
233 | |
234 | /* Yes, it means that if you are meant to receive this |
235 | * pfkey message you receive it twice as promiscuous |
236 | * socket. |
237 | */ |
238 | if (pfk->promisc) |
239 | pfkey_broadcast_one(skb, GFP_ATOMIC, sk); |
240 | |
241 | /* the exact target will be processed later */ |
242 | if (sk == one_sk) |
243 | continue; |
244 | if (broadcast_flags != BROADCAST_ALL) { |
245 | if (broadcast_flags & BROADCAST_PROMISC_ONLY) |
246 | continue; |
247 | if ((broadcast_flags & BROADCAST_REGISTERED) && |
248 | !pfk->registered) |
249 | continue; |
250 | if (broadcast_flags & BROADCAST_ONE) |
251 | continue; |
252 | } |
253 | |
254 | err2 = pfkey_broadcast_one(skb, GFP_ATOMIC, sk); |
255 | |
256 | /* Error is cleared after successful sending to at least one |
257 | * registered KM */ |
258 | if ((broadcast_flags & BROADCAST_REGISTERED) && err) |
259 | err = err2; |
260 | } |
261 | rcu_read_unlock(); |
262 | |
263 | if (one_sk != NULL) |
264 | err = pfkey_broadcast_one(skb, allocation, sk: one_sk); |
265 | |
266 | kfree_skb(skb); |
267 | return err; |
268 | } |
269 | |
270 | static int pfkey_do_dump(struct pfkey_sock *pfk) |
271 | { |
272 | struct sadb_msg *hdr; |
273 | int rc; |
274 | |
275 | mutex_lock(&pfk->dump_lock); |
276 | if (!pfk->dump.dump) { |
277 | rc = 0; |
278 | goto out; |
279 | } |
280 | |
281 | rc = pfk->dump.dump(pfk); |
282 | if (rc == -ENOBUFS) { |
283 | rc = 0; |
284 | goto out; |
285 | } |
286 | |
287 | if (pfk->dump.skb) { |
288 | if (!pfkey_can_dump(sk: &pfk->sk)) { |
289 | rc = 0; |
290 | goto out; |
291 | } |
292 | |
293 | hdr = (struct sadb_msg *) pfk->dump.skb->data; |
294 | hdr->sadb_msg_seq = 0; |
295 | hdr->sadb_msg_errno = rc; |
296 | pfkey_broadcast(skb: pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE, |
297 | one_sk: &pfk->sk, net: sock_net(sk: &pfk->sk)); |
298 | pfk->dump.skb = NULL; |
299 | } |
300 | |
301 | pfkey_terminate_dump(pfk); |
302 | |
303 | out: |
304 | mutex_unlock(lock: &pfk->dump_lock); |
305 | return rc; |
306 | } |
307 | |
308 | static inline void pfkey_hdr_dup(struct sadb_msg *new, |
309 | const struct sadb_msg *orig) |
310 | { |
311 | *new = *orig; |
312 | } |
313 | |
314 | static int pfkey_error(const struct sadb_msg *orig, int err, struct sock *sk) |
315 | { |
316 | struct sk_buff *skb = alloc_skb(size: sizeof(struct sadb_msg) + 16, GFP_KERNEL); |
317 | struct sadb_msg *hdr; |
318 | |
319 | if (!skb) |
320 | return -ENOBUFS; |
321 | |
322 | /* Woe be to the platform trying to support PFKEY yet |
323 | * having normal errnos outside the 1-255 range, inclusive. |
324 | */ |
325 | err = -err; |
326 | if (err == ERESTARTSYS || |
327 | err == ERESTARTNOHAND || |
328 | err == ERESTARTNOINTR) |
329 | err = EINTR; |
330 | if (err >= 512) |
331 | err = EINVAL; |
332 | BUG_ON(err <= 0 || err >= 256); |
333 | |
334 | hdr = skb_put(skb, len: sizeof(struct sadb_msg)); |
335 | pfkey_hdr_dup(new: hdr, orig); |
336 | hdr->sadb_msg_errno = (uint8_t) err; |
337 | hdr->sadb_msg_len = (sizeof(struct sadb_msg) / |
338 | sizeof(uint64_t)); |
339 | |
340 | pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ONE, one_sk: sk, net: sock_net(sk)); |
341 | |
342 | return 0; |
343 | } |
344 | |
345 | static const u8 sadb_ext_min_len[] = { |
346 | [SADB_EXT_RESERVED] = (u8) 0, |
347 | [SADB_EXT_SA] = (u8) sizeof(struct sadb_sa), |
348 | [SADB_EXT_LIFETIME_CURRENT] = (u8) sizeof(struct sadb_lifetime), |
349 | [SADB_EXT_LIFETIME_HARD] = (u8) sizeof(struct sadb_lifetime), |
350 | [SADB_EXT_LIFETIME_SOFT] = (u8) sizeof(struct sadb_lifetime), |
351 | [SADB_EXT_ADDRESS_SRC] = (u8) sizeof(struct sadb_address), |
352 | [SADB_EXT_ADDRESS_DST] = (u8) sizeof(struct sadb_address), |
353 | [SADB_EXT_ADDRESS_PROXY] = (u8) sizeof(struct sadb_address), |
354 | [SADB_EXT_KEY_AUTH] = (u8) sizeof(struct sadb_key), |
355 | [SADB_EXT_KEY_ENCRYPT] = (u8) sizeof(struct sadb_key), |
356 | [SADB_EXT_IDENTITY_SRC] = (u8) sizeof(struct sadb_ident), |
357 | [SADB_EXT_IDENTITY_DST] = (u8) sizeof(struct sadb_ident), |
358 | [SADB_EXT_SENSITIVITY] = (u8) sizeof(struct sadb_sens), |
359 | [SADB_EXT_PROPOSAL] = (u8) sizeof(struct sadb_prop), |
360 | [SADB_EXT_SUPPORTED_AUTH] = (u8) sizeof(struct sadb_supported), |
361 | [SADB_EXT_SUPPORTED_ENCRYPT] = (u8) sizeof(struct sadb_supported), |
362 | [SADB_EXT_SPIRANGE] = (u8) sizeof(struct sadb_spirange), |
363 | [SADB_X_EXT_KMPRIVATE] = (u8) sizeof(struct sadb_x_kmprivate), |
364 | [SADB_X_EXT_POLICY] = (u8) sizeof(struct sadb_x_policy), |
365 | [SADB_X_EXT_SA2] = (u8) sizeof(struct sadb_x_sa2), |
366 | [SADB_X_EXT_NAT_T_TYPE] = (u8) sizeof(struct sadb_x_nat_t_type), |
367 | [SADB_X_EXT_NAT_T_SPORT] = (u8) sizeof(struct sadb_x_nat_t_port), |
368 | [SADB_X_EXT_NAT_T_DPORT] = (u8) sizeof(struct sadb_x_nat_t_port), |
369 | [SADB_X_EXT_NAT_T_OA] = (u8) sizeof(struct sadb_address), |
370 | [SADB_X_EXT_SEC_CTX] = (u8) sizeof(struct sadb_x_sec_ctx), |
371 | [SADB_X_EXT_KMADDRESS] = (u8) sizeof(struct sadb_x_kmaddress), |
372 | [SADB_X_EXT_FILTER] = (u8) sizeof(struct sadb_x_filter), |
373 | }; |
374 | |
375 | /* Verify sadb_address_{len,prefixlen} against sa_family. */ |
376 | static int verify_address_len(const void *p) |
377 | { |
378 | const struct sadb_address *sp = p; |
379 | const struct sockaddr *addr = (const struct sockaddr *)(sp + 1); |
380 | const struct sockaddr_in *sin; |
381 | #if IS_ENABLED(CONFIG_IPV6) |
382 | const struct sockaddr_in6 *sin6; |
383 | #endif |
384 | int len; |
385 | |
386 | if (sp->sadb_address_len < |
387 | DIV_ROUND_UP(sizeof(*sp) + offsetofend(typeof(*addr), sa_family), |
388 | sizeof(uint64_t))) |
389 | return -EINVAL; |
390 | |
391 | switch (addr->sa_family) { |
392 | case AF_INET: |
393 | len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin), sizeof(uint64_t)); |
394 | if (sp->sadb_address_len != len || |
395 | sp->sadb_address_prefixlen > 32) |
396 | return -EINVAL; |
397 | break; |
398 | #if IS_ENABLED(CONFIG_IPV6) |
399 | case AF_INET6: |
400 | len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin6), sizeof(uint64_t)); |
401 | if (sp->sadb_address_len != len || |
402 | sp->sadb_address_prefixlen > 128) |
403 | return -EINVAL; |
404 | break; |
405 | #endif |
406 | default: |
407 | /* It is user using kernel to keep track of security |
408 | * associations for another protocol, such as |
409 | * OSPF/RSVP/RIPV2/MIP. It is user's job to verify |
410 | * lengths. |
411 | * |
412 | * XXX Actually, association/policy database is not yet |
413 | * XXX able to cope with arbitrary sockaddr families. |
414 | * XXX When it can, remove this -EINVAL. -DaveM |
415 | */ |
416 | return -EINVAL; |
417 | } |
418 | |
419 | return 0; |
420 | } |
421 | |
422 | static inline int sadb_key_len(const struct sadb_key *key) |
423 | { |
424 | int key_bytes = DIV_ROUND_UP(key->sadb_key_bits, 8); |
425 | |
426 | return DIV_ROUND_UP(sizeof(struct sadb_key) + key_bytes, |
427 | sizeof(uint64_t)); |
428 | } |
429 | |
430 | static int verify_key_len(const void *p) |
431 | { |
432 | const struct sadb_key *key = p; |
433 | |
434 | if (sadb_key_len(key) > key->sadb_key_len) |
435 | return -EINVAL; |
436 | |
437 | return 0; |
438 | } |
439 | |
440 | static inline int pfkey_sec_ctx_len(const struct sadb_x_sec_ctx *sec_ctx) |
441 | { |
442 | return DIV_ROUND_UP(sizeof(struct sadb_x_sec_ctx) + |
443 | sec_ctx->sadb_x_ctx_len, |
444 | sizeof(uint64_t)); |
445 | } |
446 | |
447 | static inline int verify_sec_ctx_len(const void *p) |
448 | { |
449 | const struct sadb_x_sec_ctx *sec_ctx = p; |
450 | int len = sec_ctx->sadb_x_ctx_len; |
451 | |
452 | if (len > PAGE_SIZE) |
453 | return -EINVAL; |
454 | |
455 | len = pfkey_sec_ctx_len(sec_ctx); |
456 | |
457 | if (sec_ctx->sadb_x_sec_len != len) |
458 | return -EINVAL; |
459 | |
460 | return 0; |
461 | } |
462 | |
463 | static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(const struct sadb_x_sec_ctx *sec_ctx, |
464 | gfp_t gfp) |
465 | { |
466 | struct xfrm_user_sec_ctx *uctx = NULL; |
467 | int ctx_size = sec_ctx->sadb_x_ctx_len; |
468 | |
469 | uctx = kmalloc(size: (sizeof(*uctx)+ctx_size), flags: gfp); |
470 | |
471 | if (!uctx) |
472 | return NULL; |
473 | |
474 | uctx->len = pfkey_sec_ctx_len(sec_ctx); |
475 | uctx->exttype = sec_ctx->sadb_x_sec_exttype; |
476 | uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi; |
477 | uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg; |
478 | uctx->ctx_len = sec_ctx->sadb_x_ctx_len; |
479 | memcpy(uctx + 1, sec_ctx + 1, |
480 | uctx->ctx_len); |
481 | |
482 | return uctx; |
483 | } |
484 | |
485 | static int present_and_same_family(const struct sadb_address *src, |
486 | const struct sadb_address *dst) |
487 | { |
488 | const struct sockaddr *s_addr, *d_addr; |
489 | |
490 | if (!src || !dst) |
491 | return 0; |
492 | |
493 | s_addr = (const struct sockaddr *)(src + 1); |
494 | d_addr = (const struct sockaddr *)(dst + 1); |
495 | if (s_addr->sa_family != d_addr->sa_family) |
496 | return 0; |
497 | if (s_addr->sa_family != AF_INET |
498 | #if IS_ENABLED(CONFIG_IPV6) |
499 | && s_addr->sa_family != AF_INET6 |
500 | #endif |
501 | ) |
502 | return 0; |
503 | |
504 | return 1; |
505 | } |
506 | |
507 | static int parse_exthdrs(struct sk_buff *skb, const struct sadb_msg *hdr, void **ext_hdrs) |
508 | { |
509 | const char *p = (char *) hdr; |
510 | int len = skb->len; |
511 | |
512 | len -= sizeof(*hdr); |
513 | p += sizeof(*hdr); |
514 | while (len > 0) { |
515 | const struct sadb_ext *ehdr = (const struct sadb_ext *) p; |
516 | uint16_t ext_type; |
517 | int ext_len; |
518 | |
519 | if (len < sizeof(*ehdr)) |
520 | return -EINVAL; |
521 | |
522 | ext_len = ehdr->sadb_ext_len; |
523 | ext_len *= sizeof(uint64_t); |
524 | ext_type = ehdr->sadb_ext_type; |
525 | if (ext_len < sizeof(uint64_t) || |
526 | ext_len > len || |
527 | ext_type == SADB_EXT_RESERVED) |
528 | return -EINVAL; |
529 | |
530 | if (ext_type <= SADB_EXT_MAX) { |
531 | int min = (int) sadb_ext_min_len[ext_type]; |
532 | if (ext_len < min) |
533 | return -EINVAL; |
534 | if (ext_hdrs[ext_type-1] != NULL) |
535 | return -EINVAL; |
536 | switch (ext_type) { |
537 | case SADB_EXT_ADDRESS_SRC: |
538 | case SADB_EXT_ADDRESS_DST: |
539 | case SADB_EXT_ADDRESS_PROXY: |
540 | case SADB_X_EXT_NAT_T_OA: |
541 | if (verify_address_len(p)) |
542 | return -EINVAL; |
543 | break; |
544 | case SADB_X_EXT_SEC_CTX: |
545 | if (verify_sec_ctx_len(p)) |
546 | return -EINVAL; |
547 | break; |
548 | case SADB_EXT_KEY_AUTH: |
549 | case SADB_EXT_KEY_ENCRYPT: |
550 | if (verify_key_len(p)) |
551 | return -EINVAL; |
552 | break; |
553 | default: |
554 | break; |
555 | } |
556 | ext_hdrs[ext_type-1] = (void *) p; |
557 | } |
558 | p += ext_len; |
559 | len -= ext_len; |
560 | } |
561 | |
562 | return 0; |
563 | } |
564 | |
565 | static uint16_t |
566 | pfkey_satype2proto(uint8_t satype) |
567 | { |
568 | switch (satype) { |
569 | case SADB_SATYPE_UNSPEC: |
570 | return IPSEC_PROTO_ANY; |
571 | case SADB_SATYPE_AH: |
572 | return IPPROTO_AH; |
573 | case SADB_SATYPE_ESP: |
574 | return IPPROTO_ESP; |
575 | case SADB_X_SATYPE_IPCOMP: |
576 | return IPPROTO_COMP; |
577 | default: |
578 | return 0; |
579 | } |
580 | /* NOTREACHED */ |
581 | } |
582 | |
583 | static uint8_t |
584 | pfkey_proto2satype(uint16_t proto) |
585 | { |
586 | switch (proto) { |
587 | case IPPROTO_AH: |
588 | return SADB_SATYPE_AH; |
589 | case IPPROTO_ESP: |
590 | return SADB_SATYPE_ESP; |
591 | case IPPROTO_COMP: |
592 | return SADB_X_SATYPE_IPCOMP; |
593 | default: |
594 | return 0; |
595 | } |
596 | /* NOTREACHED */ |
597 | } |
598 | |
599 | /* BTW, this scheme means that there is no way with PFKEY2 sockets to |
600 | * say specifically 'just raw sockets' as we encode them as 255. |
601 | */ |
602 | |
603 | static uint8_t pfkey_proto_to_xfrm(uint8_t proto) |
604 | { |
605 | return proto == IPSEC_PROTO_ANY ? 0 : proto; |
606 | } |
607 | |
608 | static uint8_t pfkey_proto_from_xfrm(uint8_t proto) |
609 | { |
610 | return proto ? proto : IPSEC_PROTO_ANY; |
611 | } |
612 | |
613 | static inline int pfkey_sockaddr_len(sa_family_t family) |
614 | { |
615 | switch (family) { |
616 | case AF_INET: |
617 | return sizeof(struct sockaddr_in); |
618 | #if IS_ENABLED(CONFIG_IPV6) |
619 | case AF_INET6: |
620 | return sizeof(struct sockaddr_in6); |
621 | #endif |
622 | } |
623 | return 0; |
624 | } |
625 | |
626 | static |
627 | int (const struct sockaddr *sa, xfrm_address_t *xaddr) |
628 | { |
629 | switch (sa->sa_family) { |
630 | case AF_INET: |
631 | xaddr->a4 = |
632 | ((struct sockaddr_in *)sa)->sin_addr.s_addr; |
633 | return AF_INET; |
634 | #if IS_ENABLED(CONFIG_IPV6) |
635 | case AF_INET6: |
636 | memcpy(xaddr->a6, |
637 | &((struct sockaddr_in6 *)sa)->sin6_addr, |
638 | sizeof(struct in6_addr)); |
639 | return AF_INET6; |
640 | #endif |
641 | } |
642 | return 0; |
643 | } |
644 | |
645 | static |
646 | int pfkey_sadb_addr2xfrm_addr(const struct sadb_address *addr, xfrm_address_t *xaddr) |
647 | { |
648 | return pfkey_sockaddr_extract(sa: (struct sockaddr *)(addr + 1), |
649 | xaddr); |
650 | } |
651 | |
652 | static struct xfrm_state *pfkey_xfrm_state_lookup(struct net *net, const struct sadb_msg *hdr, void * const *ext_hdrs) |
653 | { |
654 | const struct sadb_sa *sa; |
655 | const struct sadb_address *addr; |
656 | uint16_t proto; |
657 | unsigned short family; |
658 | xfrm_address_t *xaddr; |
659 | |
660 | sa = ext_hdrs[SADB_EXT_SA - 1]; |
661 | if (sa == NULL) |
662 | return NULL; |
663 | |
664 | proto = pfkey_satype2proto(satype: hdr->sadb_msg_satype); |
665 | if (proto == 0) |
666 | return NULL; |
667 | |
668 | /* sadb_address_len should be checked by caller */ |
669 | addr = ext_hdrs[SADB_EXT_ADDRESS_DST - 1]; |
670 | if (addr == NULL) |
671 | return NULL; |
672 | |
673 | family = ((const struct sockaddr *)(addr + 1))->sa_family; |
674 | switch (family) { |
675 | case AF_INET: |
676 | xaddr = (xfrm_address_t *)&((const struct sockaddr_in *)(addr + 1))->sin_addr; |
677 | break; |
678 | #if IS_ENABLED(CONFIG_IPV6) |
679 | case AF_INET6: |
680 | xaddr = (xfrm_address_t *)&((const struct sockaddr_in6 *)(addr + 1))->sin6_addr; |
681 | break; |
682 | #endif |
683 | default: |
684 | xaddr = NULL; |
685 | } |
686 | |
687 | if (!xaddr) |
688 | return NULL; |
689 | |
690 | return xfrm_state_lookup(net, DUMMY_MARK, daddr: xaddr, spi: sa->sadb_sa_spi, proto, family); |
691 | } |
692 | |
693 | #define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1))) |
694 | |
695 | static int |
696 | pfkey_sockaddr_size(sa_family_t family) |
697 | { |
698 | return PFKEY_ALIGN8(pfkey_sockaddr_len(family)); |
699 | } |
700 | |
701 | static inline int pfkey_mode_from_xfrm(int mode) |
702 | { |
703 | switch(mode) { |
704 | case XFRM_MODE_TRANSPORT: |
705 | return IPSEC_MODE_TRANSPORT; |
706 | case XFRM_MODE_TUNNEL: |
707 | return IPSEC_MODE_TUNNEL; |
708 | case XFRM_MODE_BEET: |
709 | return IPSEC_MODE_BEET; |
710 | default: |
711 | return -1; |
712 | } |
713 | } |
714 | |
715 | static inline int pfkey_mode_to_xfrm(int mode) |
716 | { |
717 | switch(mode) { |
718 | case IPSEC_MODE_ANY: /*XXX*/ |
719 | case IPSEC_MODE_TRANSPORT: |
720 | return XFRM_MODE_TRANSPORT; |
721 | case IPSEC_MODE_TUNNEL: |
722 | return XFRM_MODE_TUNNEL; |
723 | case IPSEC_MODE_BEET: |
724 | return XFRM_MODE_BEET; |
725 | default: |
726 | return -1; |
727 | } |
728 | } |
729 | |
730 | static unsigned int pfkey_sockaddr_fill(const xfrm_address_t *xaddr, __be16 port, |
731 | struct sockaddr *sa, |
732 | unsigned short family) |
733 | { |
734 | switch (family) { |
735 | case AF_INET: |
736 | { |
737 | struct sockaddr_in *sin = (struct sockaddr_in *)sa; |
738 | sin->sin_family = AF_INET; |
739 | sin->sin_port = port; |
740 | sin->sin_addr.s_addr = xaddr->a4; |
741 | memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); |
742 | return 32; |
743 | } |
744 | #if IS_ENABLED(CONFIG_IPV6) |
745 | case AF_INET6: |
746 | { |
747 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa; |
748 | sin6->sin6_family = AF_INET6; |
749 | sin6->sin6_port = port; |
750 | sin6->sin6_flowinfo = 0; |
751 | sin6->sin6_addr = xaddr->in6; |
752 | sin6->sin6_scope_id = 0; |
753 | return 128; |
754 | } |
755 | #endif |
756 | } |
757 | return 0; |
758 | } |
759 | |
760 | static struct sk_buff *__pfkey_xfrm_state2msg(const struct xfrm_state *x, |
761 | int add_keys, int hsc) |
762 | { |
763 | struct sk_buff *skb; |
764 | struct sadb_msg *hdr; |
765 | struct sadb_sa *sa; |
766 | struct sadb_lifetime *lifetime; |
767 | struct sadb_address *addr; |
768 | struct sadb_key *key; |
769 | struct sadb_x_sa2 *sa2; |
770 | struct sadb_x_sec_ctx *sec_ctx; |
771 | struct xfrm_sec_ctx *xfrm_ctx; |
772 | int ctx_size = 0; |
773 | int size; |
774 | int auth_key_size = 0; |
775 | int encrypt_key_size = 0; |
776 | int sockaddr_size; |
777 | struct xfrm_encap_tmpl *natt = NULL; |
778 | int mode; |
779 | |
780 | /* address family check */ |
781 | sockaddr_size = pfkey_sockaddr_size(family: x->props.family); |
782 | if (!sockaddr_size) |
783 | return ERR_PTR(error: -EINVAL); |
784 | |
785 | /* base, SA, (lifetime (HSC),) address(SD), (address(P),) |
786 | key(AE), (identity(SD),) (sensitivity)> */ |
787 | size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) + |
788 | sizeof(struct sadb_lifetime) + |
789 | ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) + |
790 | ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) + |
791 | sizeof(struct sadb_address)*2 + |
792 | sockaddr_size*2 + |
793 | sizeof(struct sadb_x_sa2); |
794 | |
795 | if ((xfrm_ctx = x->security)) { |
796 | ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len); |
797 | size += sizeof(struct sadb_x_sec_ctx) + ctx_size; |
798 | } |
799 | |
800 | /* identity & sensitivity */ |
801 | if (!xfrm_addr_equal(a: &x->sel.saddr, b: &x->props.saddr, family: x->props.family)) |
802 | size += sizeof(struct sadb_address) + sockaddr_size; |
803 | |
804 | if (add_keys) { |
805 | if (x->aalg && x->aalg->alg_key_len) { |
806 | auth_key_size = |
807 | PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8); |
808 | size += sizeof(struct sadb_key) + auth_key_size; |
809 | } |
810 | if (x->ealg && x->ealg->alg_key_len) { |
811 | encrypt_key_size = |
812 | PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8); |
813 | size += sizeof(struct sadb_key) + encrypt_key_size; |
814 | } |
815 | } |
816 | if (x->encap) |
817 | natt = x->encap; |
818 | |
819 | if (natt && natt->encap_type) { |
820 | size += sizeof(struct sadb_x_nat_t_type); |
821 | size += sizeof(struct sadb_x_nat_t_port); |
822 | size += sizeof(struct sadb_x_nat_t_port); |
823 | } |
824 | |
825 | skb = alloc_skb(size: size + 16, GFP_ATOMIC); |
826 | if (skb == NULL) |
827 | return ERR_PTR(error: -ENOBUFS); |
828 | |
829 | /* call should fill header later */ |
830 | hdr = skb_put(skb, len: sizeof(struct sadb_msg)); |
831 | memset(hdr, 0, size); /* XXX do we need this ? */ |
832 | hdr->sadb_msg_len = size / sizeof(uint64_t); |
833 | |
834 | /* sa */ |
835 | sa = skb_put(skb, len: sizeof(struct sadb_sa)); |
836 | sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t); |
837 | sa->sadb_sa_exttype = SADB_EXT_SA; |
838 | sa->sadb_sa_spi = x->id.spi; |
839 | sa->sadb_sa_replay = x->props.replay_window; |
840 | switch (x->km.state) { |
841 | case XFRM_STATE_VALID: |
842 | sa->sadb_sa_state = x->km.dying ? |
843 | SADB_SASTATE_DYING : SADB_SASTATE_MATURE; |
844 | break; |
845 | case XFRM_STATE_ACQ: |
846 | sa->sadb_sa_state = SADB_SASTATE_LARVAL; |
847 | break; |
848 | default: |
849 | sa->sadb_sa_state = SADB_SASTATE_DEAD; |
850 | break; |
851 | } |
852 | sa->sadb_sa_auth = 0; |
853 | if (x->aalg) { |
854 | struct xfrm_algo_desc *a = xfrm_aalg_get_byname(name: x->aalg->alg_name, probe: 0); |
855 | sa->sadb_sa_auth = (a && a->pfkey_supported) ? |
856 | a->desc.sadb_alg_id : 0; |
857 | } |
858 | sa->sadb_sa_encrypt = 0; |
859 | BUG_ON(x->ealg && x->calg); |
860 | if (x->ealg) { |
861 | struct xfrm_algo_desc *a = xfrm_ealg_get_byname(name: x->ealg->alg_name, probe: 0); |
862 | sa->sadb_sa_encrypt = (a && a->pfkey_supported) ? |
863 | a->desc.sadb_alg_id : 0; |
864 | } |
865 | /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */ |
866 | if (x->calg) { |
867 | struct xfrm_algo_desc *a = xfrm_calg_get_byname(name: x->calg->alg_name, probe: 0); |
868 | sa->sadb_sa_encrypt = (a && a->pfkey_supported) ? |
869 | a->desc.sadb_alg_id : 0; |
870 | } |
871 | |
872 | sa->sadb_sa_flags = 0; |
873 | if (x->props.flags & XFRM_STATE_NOECN) |
874 | sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN; |
875 | if (x->props.flags & XFRM_STATE_DECAP_DSCP) |
876 | sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP; |
877 | if (x->props.flags & XFRM_STATE_NOPMTUDISC) |
878 | sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC; |
879 | |
880 | /* hard time */ |
881 | if (hsc & 2) { |
882 | lifetime = skb_put(skb, len: sizeof(struct sadb_lifetime)); |
883 | lifetime->sadb_lifetime_len = |
884 | sizeof(struct sadb_lifetime)/sizeof(uint64_t); |
885 | lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD; |
886 | lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.hard_packet_limit); |
887 | lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit); |
888 | lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds; |
889 | lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds; |
890 | } |
891 | /* soft time */ |
892 | if (hsc & 1) { |
893 | lifetime = skb_put(skb, len: sizeof(struct sadb_lifetime)); |
894 | lifetime->sadb_lifetime_len = |
895 | sizeof(struct sadb_lifetime)/sizeof(uint64_t); |
896 | lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT; |
897 | lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.soft_packet_limit); |
898 | lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit); |
899 | lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds; |
900 | lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds; |
901 | } |
902 | /* current time */ |
903 | lifetime = skb_put(skb, len: sizeof(struct sadb_lifetime)); |
904 | lifetime->sadb_lifetime_len = |
905 | sizeof(struct sadb_lifetime)/sizeof(uint64_t); |
906 | lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; |
907 | lifetime->sadb_lifetime_allocations = x->curlft.packets; |
908 | lifetime->sadb_lifetime_bytes = x->curlft.bytes; |
909 | lifetime->sadb_lifetime_addtime = x->curlft.add_time; |
910 | lifetime->sadb_lifetime_usetime = x->curlft.use_time; |
911 | /* src address */ |
912 | addr = skb_put(skb, len: sizeof(struct sadb_address) + sockaddr_size); |
913 | addr->sadb_address_len = |
914 | (sizeof(struct sadb_address)+sockaddr_size)/ |
915 | sizeof(uint64_t); |
916 | addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; |
917 | /* "if the ports are non-zero, then the sadb_address_proto field, |
918 | normally zero, MUST be filled in with the transport |
919 | protocol's number." - RFC2367 */ |
920 | addr->sadb_address_proto = 0; |
921 | addr->sadb_address_reserved = 0; |
922 | |
923 | addr->sadb_address_prefixlen = |
924 | pfkey_sockaddr_fill(xaddr: &x->props.saddr, port: 0, |
925 | sa: (struct sockaddr *) (addr + 1), |
926 | family: x->props.family); |
927 | BUG_ON(!addr->sadb_address_prefixlen); |
928 | |
929 | /* dst address */ |
930 | addr = skb_put(skb, len: sizeof(struct sadb_address) + sockaddr_size); |
931 | addr->sadb_address_len = |
932 | (sizeof(struct sadb_address)+sockaddr_size)/ |
933 | sizeof(uint64_t); |
934 | addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; |
935 | addr->sadb_address_proto = 0; |
936 | addr->sadb_address_reserved = 0; |
937 | |
938 | addr->sadb_address_prefixlen = |
939 | pfkey_sockaddr_fill(xaddr: &x->id.daddr, port: 0, |
940 | sa: (struct sockaddr *) (addr + 1), |
941 | family: x->props.family); |
942 | BUG_ON(!addr->sadb_address_prefixlen); |
943 | |
944 | if (!xfrm_addr_equal(a: &x->sel.saddr, b: &x->props.saddr, |
945 | family: x->props.family)) { |
946 | addr = skb_put(skb, |
947 | len: sizeof(struct sadb_address) + sockaddr_size); |
948 | addr->sadb_address_len = |
949 | (sizeof(struct sadb_address)+sockaddr_size)/ |
950 | sizeof(uint64_t); |
951 | addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY; |
952 | addr->sadb_address_proto = |
953 | pfkey_proto_from_xfrm(proto: x->sel.proto); |
954 | addr->sadb_address_prefixlen = x->sel.prefixlen_s; |
955 | addr->sadb_address_reserved = 0; |
956 | |
957 | pfkey_sockaddr_fill(xaddr: &x->sel.saddr, port: x->sel.sport, |
958 | sa: (struct sockaddr *) (addr + 1), |
959 | family: x->props.family); |
960 | } |
961 | |
962 | /* auth key */ |
963 | if (add_keys && auth_key_size) { |
964 | key = skb_put(skb, len: sizeof(struct sadb_key) + auth_key_size); |
965 | key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) / |
966 | sizeof(uint64_t); |
967 | key->sadb_key_exttype = SADB_EXT_KEY_AUTH; |
968 | key->sadb_key_bits = x->aalg->alg_key_len; |
969 | key->sadb_key_reserved = 0; |
970 | memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8); |
971 | } |
972 | /* encrypt key */ |
973 | if (add_keys && encrypt_key_size) { |
974 | key = skb_put(skb, len: sizeof(struct sadb_key) + encrypt_key_size); |
975 | key->sadb_key_len = (sizeof(struct sadb_key) + |
976 | encrypt_key_size) / sizeof(uint64_t); |
977 | key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT; |
978 | key->sadb_key_bits = x->ealg->alg_key_len; |
979 | key->sadb_key_reserved = 0; |
980 | memcpy(key + 1, x->ealg->alg_key, |
981 | (x->ealg->alg_key_len+7)/8); |
982 | } |
983 | |
984 | /* sa */ |
985 | sa2 = skb_put(skb, len: sizeof(struct sadb_x_sa2)); |
986 | sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t); |
987 | sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2; |
988 | if ((mode = pfkey_mode_from_xfrm(mode: x->props.mode)) < 0) { |
989 | kfree_skb(skb); |
990 | return ERR_PTR(error: -EINVAL); |
991 | } |
992 | sa2->sadb_x_sa2_mode = mode; |
993 | sa2->sadb_x_sa2_reserved1 = 0; |
994 | sa2->sadb_x_sa2_reserved2 = 0; |
995 | sa2->sadb_x_sa2_sequence = 0; |
996 | sa2->sadb_x_sa2_reqid = x->props.reqid; |
997 | |
998 | if (natt && natt->encap_type) { |
999 | struct sadb_x_nat_t_type *n_type; |
1000 | struct sadb_x_nat_t_port *n_port; |
1001 | |
1002 | /* type */ |
1003 | n_type = skb_put(skb, len: sizeof(*n_type)); |
1004 | n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t); |
1005 | n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE; |
1006 | n_type->sadb_x_nat_t_type_type = natt->encap_type; |
1007 | n_type->sadb_x_nat_t_type_reserved[0] = 0; |
1008 | n_type->sadb_x_nat_t_type_reserved[1] = 0; |
1009 | n_type->sadb_x_nat_t_type_reserved[2] = 0; |
1010 | |
1011 | /* source port */ |
1012 | n_port = skb_put(skb, len: sizeof(*n_port)); |
1013 | n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); |
1014 | n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT; |
1015 | n_port->sadb_x_nat_t_port_port = natt->encap_sport; |
1016 | n_port->sadb_x_nat_t_port_reserved = 0; |
1017 | |
1018 | /* dest port */ |
1019 | n_port = skb_put(skb, len: sizeof(*n_port)); |
1020 | n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); |
1021 | n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT; |
1022 | n_port->sadb_x_nat_t_port_port = natt->encap_dport; |
1023 | n_port->sadb_x_nat_t_port_reserved = 0; |
1024 | } |
1025 | |
1026 | /* security context */ |
1027 | if (xfrm_ctx) { |
1028 | sec_ctx = skb_put(skb, |
1029 | len: sizeof(struct sadb_x_sec_ctx) + ctx_size); |
1030 | sec_ctx->sadb_x_sec_len = |
1031 | (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t); |
1032 | sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX; |
1033 | sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi; |
1034 | sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg; |
1035 | sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len; |
1036 | memcpy(sec_ctx + 1, xfrm_ctx->ctx_str, |
1037 | xfrm_ctx->ctx_len); |
1038 | } |
1039 | |
1040 | return skb; |
1041 | } |
1042 | |
1043 | |
1044 | static inline struct sk_buff *pfkey_xfrm_state2msg(const struct xfrm_state *x) |
1045 | { |
1046 | struct sk_buff *skb; |
1047 | |
1048 | skb = __pfkey_xfrm_state2msg(x, add_keys: 1, hsc: 3); |
1049 | |
1050 | return skb; |
1051 | } |
1052 | |
1053 | static inline struct sk_buff *pfkey_xfrm_state2msg_expire(const struct xfrm_state *x, |
1054 | int hsc) |
1055 | { |
1056 | return __pfkey_xfrm_state2msg(x, add_keys: 0, hsc); |
1057 | } |
1058 | |
1059 | static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net, |
1060 | const struct sadb_msg *hdr, |
1061 | void * const *ext_hdrs) |
1062 | { |
1063 | struct xfrm_state *x; |
1064 | const struct sadb_lifetime *lifetime; |
1065 | const struct sadb_sa *sa; |
1066 | const struct sadb_key *key; |
1067 | const struct sadb_x_sec_ctx *sec_ctx; |
1068 | uint16_t proto; |
1069 | int err; |
1070 | |
1071 | |
1072 | sa = ext_hdrs[SADB_EXT_SA - 1]; |
1073 | if (!sa || |
1074 | !present_and_same_family(src: ext_hdrs[SADB_EXT_ADDRESS_SRC-1], |
1075 | dst: ext_hdrs[SADB_EXT_ADDRESS_DST-1])) |
1076 | return ERR_PTR(error: -EINVAL); |
1077 | if (hdr->sadb_msg_satype == SADB_SATYPE_ESP && |
1078 | !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1]) |
1079 | return ERR_PTR(error: -EINVAL); |
1080 | if (hdr->sadb_msg_satype == SADB_SATYPE_AH && |
1081 | !ext_hdrs[SADB_EXT_KEY_AUTH-1]) |
1082 | return ERR_PTR(error: -EINVAL); |
1083 | if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] != |
1084 | !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) |
1085 | return ERR_PTR(error: -EINVAL); |
1086 | |
1087 | proto = pfkey_satype2proto(satype: hdr->sadb_msg_satype); |
1088 | if (proto == 0) |
1089 | return ERR_PTR(error: -EINVAL); |
1090 | |
1091 | /* default error is no buffer space */ |
1092 | err = -ENOBUFS; |
1093 | |
1094 | /* RFC2367: |
1095 | |
1096 | Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message. |
1097 | SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not |
1098 | sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state. |
1099 | Therefore, the sadb_sa_state field of all submitted SAs MUST be |
1100 | SADB_SASTATE_MATURE and the kernel MUST return an error if this is |
1101 | not true. |
1102 | |
1103 | However, KAME setkey always uses SADB_SASTATE_LARVAL. |
1104 | Hence, we have to _ignore_ sadb_sa_state, which is also reasonable. |
1105 | */ |
1106 | if (sa->sadb_sa_auth > SADB_AALG_MAX || |
1107 | (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP && |
1108 | sa->sadb_sa_encrypt > SADB_X_CALG_MAX) || |
1109 | sa->sadb_sa_encrypt > SADB_EALG_MAX) |
1110 | return ERR_PTR(error: -EINVAL); |
1111 | key = ext_hdrs[SADB_EXT_KEY_AUTH - 1]; |
1112 | if (key != NULL && |
1113 | sa->sadb_sa_auth != SADB_X_AALG_NULL && |
1114 | key->sadb_key_bits == 0) |
1115 | return ERR_PTR(error: -EINVAL); |
1116 | key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1]; |
1117 | if (key != NULL && |
1118 | sa->sadb_sa_encrypt != SADB_EALG_NULL && |
1119 | key->sadb_key_bits == 0) |
1120 | return ERR_PTR(error: -EINVAL); |
1121 | |
1122 | x = xfrm_state_alloc(net); |
1123 | if (x == NULL) |
1124 | return ERR_PTR(error: -ENOBUFS); |
1125 | |
1126 | x->id.proto = proto; |
1127 | x->id.spi = sa->sadb_sa_spi; |
1128 | x->props.replay_window = min_t(unsigned int, sa->sadb_sa_replay, |
1129 | (sizeof(x->replay.bitmap) * 8)); |
1130 | if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN) |
1131 | x->props.flags |= XFRM_STATE_NOECN; |
1132 | if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP) |
1133 | x->props.flags |= XFRM_STATE_DECAP_DSCP; |
1134 | if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC) |
1135 | x->props.flags |= XFRM_STATE_NOPMTUDISC; |
1136 | |
1137 | lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD - 1]; |
1138 | if (lifetime != NULL) { |
1139 | x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); |
1140 | x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); |
1141 | x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime; |
1142 | x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime; |
1143 | } |
1144 | lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT - 1]; |
1145 | if (lifetime != NULL) { |
1146 | x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); |
1147 | x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); |
1148 | x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime; |
1149 | x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime; |
1150 | } |
1151 | |
1152 | sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1]; |
1153 | if (sec_ctx != NULL) { |
1154 | struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL); |
1155 | |
1156 | if (!uctx) |
1157 | goto out; |
1158 | |
1159 | err = security_xfrm_state_alloc(x, sec_ctx: uctx); |
1160 | kfree(objp: uctx); |
1161 | |
1162 | if (err) |
1163 | goto out; |
1164 | } |
1165 | |
1166 | err = -ENOBUFS; |
1167 | key = ext_hdrs[SADB_EXT_KEY_AUTH - 1]; |
1168 | if (sa->sadb_sa_auth) { |
1169 | int keysize = 0; |
1170 | struct xfrm_algo_desc *a = xfrm_aalg_get_byid(alg_id: sa->sadb_sa_auth); |
1171 | if (!a || !a->pfkey_supported) { |
1172 | err = -ENOSYS; |
1173 | goto out; |
1174 | } |
1175 | if (key) |
1176 | keysize = (key->sadb_key_bits + 7) / 8; |
1177 | x->aalg = kmalloc(size: sizeof(*x->aalg) + keysize, GFP_KERNEL); |
1178 | if (!x->aalg) { |
1179 | err = -ENOMEM; |
1180 | goto out; |
1181 | } |
1182 | strcpy(p: x->aalg->alg_name, q: a->name); |
1183 | x->aalg->alg_key_len = 0; |
1184 | if (key) { |
1185 | x->aalg->alg_key_len = key->sadb_key_bits; |
1186 | memcpy(x->aalg->alg_key, key+1, keysize); |
1187 | } |
1188 | x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits; |
1189 | x->props.aalgo = sa->sadb_sa_auth; |
1190 | /* x->algo.flags = sa->sadb_sa_flags; */ |
1191 | } |
1192 | if (sa->sadb_sa_encrypt) { |
1193 | if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) { |
1194 | struct xfrm_algo_desc *a = xfrm_calg_get_byid(alg_id: sa->sadb_sa_encrypt); |
1195 | if (!a || !a->pfkey_supported) { |
1196 | err = -ENOSYS; |
1197 | goto out; |
1198 | } |
1199 | x->calg = kmalloc(size: sizeof(*x->calg), GFP_KERNEL); |
1200 | if (!x->calg) { |
1201 | err = -ENOMEM; |
1202 | goto out; |
1203 | } |
1204 | strcpy(p: x->calg->alg_name, q: a->name); |
1205 | x->props.calgo = sa->sadb_sa_encrypt; |
1206 | } else { |
1207 | int keysize = 0; |
1208 | struct xfrm_algo_desc *a = xfrm_ealg_get_byid(alg_id: sa->sadb_sa_encrypt); |
1209 | if (!a || !a->pfkey_supported) { |
1210 | err = -ENOSYS; |
1211 | goto out; |
1212 | } |
1213 | key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1]; |
1214 | if (key) |
1215 | keysize = (key->sadb_key_bits + 7) / 8; |
1216 | x->ealg = kmalloc(size: sizeof(*x->ealg) + keysize, GFP_KERNEL); |
1217 | if (!x->ealg) { |
1218 | err = -ENOMEM; |
1219 | goto out; |
1220 | } |
1221 | strcpy(p: x->ealg->alg_name, q: a->name); |
1222 | x->ealg->alg_key_len = 0; |
1223 | if (key) { |
1224 | x->ealg->alg_key_len = key->sadb_key_bits; |
1225 | memcpy(x->ealg->alg_key, key+1, keysize); |
1226 | } |
1227 | x->props.ealgo = sa->sadb_sa_encrypt; |
1228 | x->geniv = a->uinfo.encr.geniv; |
1229 | } |
1230 | } |
1231 | /* x->algo.flags = sa->sadb_sa_flags; */ |
1232 | |
1233 | x->props.family = pfkey_sadb_addr2xfrm_addr(addr: (struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1], |
1234 | xaddr: &x->props.saddr); |
1235 | pfkey_sadb_addr2xfrm_addr(addr: (struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1], |
1236 | xaddr: &x->id.daddr); |
1237 | |
1238 | if (ext_hdrs[SADB_X_EXT_SA2-1]) { |
1239 | const struct sadb_x_sa2 *sa2 = ext_hdrs[SADB_X_EXT_SA2-1]; |
1240 | int mode = pfkey_mode_to_xfrm(mode: sa2->sadb_x_sa2_mode); |
1241 | if (mode < 0) { |
1242 | err = -EINVAL; |
1243 | goto out; |
1244 | } |
1245 | x->props.mode = mode; |
1246 | x->props.reqid = sa2->sadb_x_sa2_reqid; |
1247 | } |
1248 | |
1249 | if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) { |
1250 | const struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]; |
1251 | |
1252 | /* Nobody uses this, but we try. */ |
1253 | x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, xaddr: &x->sel.saddr); |
1254 | x->sel.prefixlen_s = addr->sadb_address_prefixlen; |
1255 | } |
1256 | |
1257 | if (!x->sel.family) |
1258 | x->sel.family = x->props.family; |
1259 | |
1260 | if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) { |
1261 | const struct sadb_x_nat_t_type* n_type; |
1262 | struct xfrm_encap_tmpl *natt; |
1263 | |
1264 | x->encap = kzalloc(size: sizeof(*x->encap), GFP_KERNEL); |
1265 | if (!x->encap) { |
1266 | err = -ENOMEM; |
1267 | goto out; |
1268 | } |
1269 | |
1270 | natt = x->encap; |
1271 | n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]; |
1272 | natt->encap_type = n_type->sadb_x_nat_t_type_type; |
1273 | |
1274 | if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) { |
1275 | const struct sadb_x_nat_t_port *n_port = |
1276 | ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]; |
1277 | natt->encap_sport = n_port->sadb_x_nat_t_port_port; |
1278 | } |
1279 | if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) { |
1280 | const struct sadb_x_nat_t_port *n_port = |
1281 | ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]; |
1282 | natt->encap_dport = n_port->sadb_x_nat_t_port_port; |
1283 | } |
1284 | } |
1285 | |
1286 | err = xfrm_init_state(x); |
1287 | if (err) |
1288 | goto out; |
1289 | |
1290 | x->km.seq = hdr->sadb_msg_seq; |
1291 | return x; |
1292 | |
1293 | out: |
1294 | x->km.state = XFRM_STATE_DEAD; |
1295 | xfrm_state_put(x); |
1296 | return ERR_PTR(error: err); |
1297 | } |
1298 | |
1299 | static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) |
1300 | { |
1301 | return -EOPNOTSUPP; |
1302 | } |
1303 | |
1304 | static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) |
1305 | { |
1306 | struct net *net = sock_net(sk); |
1307 | struct sk_buff *resp_skb; |
1308 | struct sadb_x_sa2 *sa2; |
1309 | struct sadb_address *saddr, *daddr; |
1310 | struct sadb_msg *out_hdr; |
1311 | struct sadb_spirange *range; |
1312 | struct xfrm_state *x = NULL; |
1313 | int mode; |
1314 | int err; |
1315 | u32 min_spi, max_spi; |
1316 | u32 reqid; |
1317 | u8 proto; |
1318 | unsigned short family; |
1319 | xfrm_address_t *xsaddr = NULL, *xdaddr = NULL; |
1320 | |
1321 | if (!present_and_same_family(src: ext_hdrs[SADB_EXT_ADDRESS_SRC-1], |
1322 | dst: ext_hdrs[SADB_EXT_ADDRESS_DST-1])) |
1323 | return -EINVAL; |
1324 | |
1325 | proto = pfkey_satype2proto(satype: hdr->sadb_msg_satype); |
1326 | if (proto == 0) |
1327 | return -EINVAL; |
1328 | |
1329 | if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) { |
1330 | mode = pfkey_mode_to_xfrm(mode: sa2->sadb_x_sa2_mode); |
1331 | if (mode < 0) |
1332 | return -EINVAL; |
1333 | reqid = sa2->sadb_x_sa2_reqid; |
1334 | } else { |
1335 | mode = 0; |
1336 | reqid = 0; |
1337 | } |
1338 | |
1339 | saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1]; |
1340 | daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1]; |
1341 | |
1342 | family = ((struct sockaddr *)(saddr + 1))->sa_family; |
1343 | switch (family) { |
1344 | case AF_INET: |
1345 | xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr; |
1346 | xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr; |
1347 | break; |
1348 | #if IS_ENABLED(CONFIG_IPV6) |
1349 | case AF_INET6: |
1350 | xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr; |
1351 | xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr; |
1352 | break; |
1353 | #endif |
1354 | } |
1355 | |
1356 | if (hdr->sadb_msg_seq) { |
1357 | x = xfrm_find_acq_byseq(net, DUMMY_MARK, seq: hdr->sadb_msg_seq); |
1358 | if (x && !xfrm_addr_equal(a: &x->id.daddr, b: xdaddr, family)) { |
1359 | xfrm_state_put(x); |
1360 | x = NULL; |
1361 | } |
1362 | } |
1363 | |
1364 | if (!x) |
1365 | x = xfrm_find_acq(net, mark: &dummy_mark, mode, reqid, if_id: 0, proto, daddr: xdaddr, saddr: xsaddr, create: 1, family); |
1366 | |
1367 | if (x == NULL) |
1368 | return -ENOENT; |
1369 | |
1370 | min_spi = 0x100; |
1371 | max_spi = 0x0fffffff; |
1372 | |
1373 | range = ext_hdrs[SADB_EXT_SPIRANGE-1]; |
1374 | if (range) { |
1375 | min_spi = range->sadb_spirange_min; |
1376 | max_spi = range->sadb_spirange_max; |
1377 | } |
1378 | |
1379 | err = verify_spi_info(proto: x->id.proto, min: min_spi, max: max_spi, NULL); |
1380 | if (err) { |
1381 | xfrm_state_put(x); |
1382 | return err; |
1383 | } |
1384 | |
1385 | err = xfrm_alloc_spi(x, minspi: min_spi, maxspi: max_spi, NULL); |
1386 | resp_skb = err ? ERR_PTR(error: err) : pfkey_xfrm_state2msg(x); |
1387 | |
1388 | if (IS_ERR(ptr: resp_skb)) { |
1389 | xfrm_state_put(x); |
1390 | return PTR_ERR(ptr: resp_skb); |
1391 | } |
1392 | |
1393 | out_hdr = (struct sadb_msg *) resp_skb->data; |
1394 | out_hdr->sadb_msg_version = hdr->sadb_msg_version; |
1395 | out_hdr->sadb_msg_type = SADB_GETSPI; |
1396 | out_hdr->sadb_msg_satype = pfkey_proto2satype(proto); |
1397 | out_hdr->sadb_msg_errno = 0; |
1398 | out_hdr->sadb_msg_reserved = 0; |
1399 | out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; |
1400 | out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; |
1401 | |
1402 | xfrm_state_put(x); |
1403 | |
1404 | pfkey_broadcast(skb: resp_skb, GFP_KERNEL, BROADCAST_ONE, one_sk: sk, net); |
1405 | |
1406 | return 0; |
1407 | } |
1408 | |
1409 | static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) |
1410 | { |
1411 | struct net *net = sock_net(sk); |
1412 | struct xfrm_state *x; |
1413 | |
1414 | if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8) |
1415 | return -EOPNOTSUPP; |
1416 | |
1417 | if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0) |
1418 | return 0; |
1419 | |
1420 | x = xfrm_find_acq_byseq(net, DUMMY_MARK, seq: hdr->sadb_msg_seq); |
1421 | if (x == NULL) |
1422 | return 0; |
1423 | |
1424 | spin_lock_bh(lock: &x->lock); |
1425 | if (x->km.state == XFRM_STATE_ACQ) |
1426 | x->km.state = XFRM_STATE_ERROR; |
1427 | |
1428 | spin_unlock_bh(lock: &x->lock); |
1429 | xfrm_state_put(x); |
1430 | return 0; |
1431 | } |
1432 | |
1433 | static inline int event2poltype(int event) |
1434 | { |
1435 | switch (event) { |
1436 | case XFRM_MSG_DELPOLICY: |
1437 | return SADB_X_SPDDELETE; |
1438 | case XFRM_MSG_NEWPOLICY: |
1439 | return SADB_X_SPDADD; |
1440 | case XFRM_MSG_UPDPOLICY: |
1441 | return SADB_X_SPDUPDATE; |
1442 | case XFRM_MSG_POLEXPIRE: |
1443 | // return SADB_X_SPDEXPIRE; |
1444 | default: |
1445 | pr_err("pfkey: Unknown policy event %d\n" , event); |
1446 | break; |
1447 | } |
1448 | |
1449 | return 0; |
1450 | } |
1451 | |
1452 | static inline int event2keytype(int event) |
1453 | { |
1454 | switch (event) { |
1455 | case XFRM_MSG_DELSA: |
1456 | return SADB_DELETE; |
1457 | case XFRM_MSG_NEWSA: |
1458 | return SADB_ADD; |
1459 | case XFRM_MSG_UPDSA: |
1460 | return SADB_UPDATE; |
1461 | case XFRM_MSG_EXPIRE: |
1462 | return SADB_EXPIRE; |
1463 | default: |
1464 | pr_err("pfkey: Unknown SA event %d\n" , event); |
1465 | break; |
1466 | } |
1467 | |
1468 | return 0; |
1469 | } |
1470 | |
1471 | /* ADD/UPD/DEL */ |
1472 | static int key_notify_sa(struct xfrm_state *x, const struct km_event *c) |
1473 | { |
1474 | struct sk_buff *skb; |
1475 | struct sadb_msg *hdr; |
1476 | |
1477 | skb = pfkey_xfrm_state2msg(x); |
1478 | |
1479 | if (IS_ERR(ptr: skb)) |
1480 | return PTR_ERR(ptr: skb); |
1481 | |
1482 | hdr = (struct sadb_msg *) skb->data; |
1483 | hdr->sadb_msg_version = PF_KEY_V2; |
1484 | hdr->sadb_msg_type = event2keytype(event: c->event); |
1485 | hdr->sadb_msg_satype = pfkey_proto2satype(proto: x->id.proto); |
1486 | hdr->sadb_msg_errno = 0; |
1487 | hdr->sadb_msg_reserved = 0; |
1488 | hdr->sadb_msg_seq = c->seq; |
1489 | hdr->sadb_msg_pid = c->portid; |
1490 | |
1491 | pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, net: xs_net(x)); |
1492 | |
1493 | return 0; |
1494 | } |
1495 | |
1496 | static int pfkey_add(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) |
1497 | { |
1498 | struct net *net = sock_net(sk); |
1499 | struct xfrm_state *x; |
1500 | int err; |
1501 | struct km_event c; |
1502 | |
1503 | x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs); |
1504 | if (IS_ERR(ptr: x)) |
1505 | return PTR_ERR(ptr: x); |
1506 | |
1507 | xfrm_state_hold(x); |
1508 | if (hdr->sadb_msg_type == SADB_ADD) |
1509 | err = xfrm_state_add(x); |
1510 | else |
1511 | err = xfrm_state_update(x); |
1512 | |
1513 | xfrm_audit_state_add(x, result: err ? 0 : 1, task_valid: true); |
1514 | |
1515 | if (err < 0) { |
1516 | x->km.state = XFRM_STATE_DEAD; |
1517 | __xfrm_state_put(x); |
1518 | goto out; |
1519 | } |
1520 | |
1521 | if (hdr->sadb_msg_type == SADB_ADD) |
1522 | c.event = XFRM_MSG_NEWSA; |
1523 | else |
1524 | c.event = XFRM_MSG_UPDSA; |
1525 | c.seq = hdr->sadb_msg_seq; |
1526 | c.portid = hdr->sadb_msg_pid; |
1527 | km_state_notify(x, c: &c); |
1528 | out: |
1529 | xfrm_state_put(x); |
1530 | return err; |
1531 | } |
1532 | |
1533 | static int pfkey_delete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) |
1534 | { |
1535 | struct net *net = sock_net(sk); |
1536 | struct xfrm_state *x; |
1537 | struct km_event c; |
1538 | int err; |
1539 | |
1540 | if (!ext_hdrs[SADB_EXT_SA-1] || |
1541 | !present_and_same_family(src: ext_hdrs[SADB_EXT_ADDRESS_SRC-1], |
1542 | dst: ext_hdrs[SADB_EXT_ADDRESS_DST-1])) |
1543 | return -EINVAL; |
1544 | |
1545 | x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs); |
1546 | if (x == NULL) |
1547 | return -ESRCH; |
1548 | |
1549 | if ((err = security_xfrm_state_delete(x))) |
1550 | goto out; |
1551 | |
1552 | if (xfrm_state_kern(x)) { |
1553 | err = -EPERM; |
1554 | goto out; |
1555 | } |
1556 | |
1557 | err = xfrm_state_delete(x); |
1558 | |
1559 | if (err < 0) |
1560 | goto out; |
1561 | |
1562 | c.seq = hdr->sadb_msg_seq; |
1563 | c.portid = hdr->sadb_msg_pid; |
1564 | c.event = XFRM_MSG_DELSA; |
1565 | km_state_notify(x, c: &c); |
1566 | out: |
1567 | xfrm_audit_state_delete(x, result: err ? 0 : 1, task_valid: true); |
1568 | xfrm_state_put(x); |
1569 | |
1570 | return err; |
1571 | } |
1572 | |
1573 | static int pfkey_get(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) |
1574 | { |
1575 | struct net *net = sock_net(sk); |
1576 | __u8 proto; |
1577 | struct sk_buff *out_skb; |
1578 | struct sadb_msg *out_hdr; |
1579 | struct xfrm_state *x; |
1580 | |
1581 | if (!ext_hdrs[SADB_EXT_SA-1] || |
1582 | !present_and_same_family(src: ext_hdrs[SADB_EXT_ADDRESS_SRC-1], |
1583 | dst: ext_hdrs[SADB_EXT_ADDRESS_DST-1])) |
1584 | return -EINVAL; |
1585 | |
1586 | x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs); |
1587 | if (x == NULL) |
1588 | return -ESRCH; |
1589 | |
1590 | out_skb = pfkey_xfrm_state2msg(x); |
1591 | proto = x->id.proto; |
1592 | xfrm_state_put(x); |
1593 | if (IS_ERR(ptr: out_skb)) |
1594 | return PTR_ERR(ptr: out_skb); |
1595 | |
1596 | out_hdr = (struct sadb_msg *) out_skb->data; |
1597 | out_hdr->sadb_msg_version = hdr->sadb_msg_version; |
1598 | out_hdr->sadb_msg_type = SADB_GET; |
1599 | out_hdr->sadb_msg_satype = pfkey_proto2satype(proto); |
1600 | out_hdr->sadb_msg_errno = 0; |
1601 | out_hdr->sadb_msg_reserved = 0; |
1602 | out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; |
1603 | out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; |
1604 | pfkey_broadcast(skb: out_skb, GFP_ATOMIC, BROADCAST_ONE, one_sk: sk, net: sock_net(sk)); |
1605 | |
1606 | return 0; |
1607 | } |
1608 | |
1609 | static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig, |
1610 | gfp_t allocation) |
1611 | { |
1612 | struct sk_buff *skb; |
1613 | struct sadb_msg *hdr; |
1614 | int len, auth_len, enc_len, i; |
1615 | |
1616 | auth_len = xfrm_count_pfkey_auth_supported(); |
1617 | if (auth_len) { |
1618 | auth_len *= sizeof(struct sadb_alg); |
1619 | auth_len += sizeof(struct sadb_supported); |
1620 | } |
1621 | |
1622 | enc_len = xfrm_count_pfkey_enc_supported(); |
1623 | if (enc_len) { |
1624 | enc_len *= sizeof(struct sadb_alg); |
1625 | enc_len += sizeof(struct sadb_supported); |
1626 | } |
1627 | |
1628 | len = enc_len + auth_len + sizeof(struct sadb_msg); |
1629 | |
1630 | skb = alloc_skb(size: len + 16, priority: allocation); |
1631 | if (!skb) |
1632 | goto out_put_algs; |
1633 | |
1634 | hdr = skb_put(skb, len: sizeof(*hdr)); |
1635 | pfkey_hdr_dup(new: hdr, orig); |
1636 | hdr->sadb_msg_errno = 0; |
1637 | hdr->sadb_msg_len = len / sizeof(uint64_t); |
1638 | |
1639 | if (auth_len) { |
1640 | struct sadb_supported *sp; |
1641 | struct sadb_alg *ap; |
1642 | |
1643 | sp = skb_put(skb, len: auth_len); |
1644 | ap = (struct sadb_alg *) (sp + 1); |
1645 | |
1646 | sp->sadb_supported_len = auth_len / sizeof(uint64_t); |
1647 | sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH; |
1648 | |
1649 | for (i = 0; ; i++) { |
1650 | struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(idx: i); |
1651 | if (!aalg) |
1652 | break; |
1653 | if (!aalg->pfkey_supported) |
1654 | continue; |
1655 | if (aalg->available) |
1656 | *ap++ = aalg->desc; |
1657 | } |
1658 | } |
1659 | |
1660 | if (enc_len) { |
1661 | struct sadb_supported *sp; |
1662 | struct sadb_alg *ap; |
1663 | |
1664 | sp = skb_put(skb, len: enc_len); |
1665 | ap = (struct sadb_alg *) (sp + 1); |
1666 | |
1667 | sp->sadb_supported_len = enc_len / sizeof(uint64_t); |
1668 | sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT; |
1669 | |
1670 | for (i = 0; ; i++) { |
1671 | struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(idx: i); |
1672 | if (!ealg) |
1673 | break; |
1674 | if (!ealg->pfkey_supported) |
1675 | continue; |
1676 | if (ealg->available) |
1677 | *ap++ = ealg->desc; |
1678 | } |
1679 | } |
1680 | |
1681 | out_put_algs: |
1682 | return skb; |
1683 | } |
1684 | |
1685 | static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) |
1686 | { |
1687 | struct pfkey_sock *pfk = pfkey_sk(sk); |
1688 | struct sk_buff *supp_skb; |
1689 | |
1690 | if (hdr->sadb_msg_satype > SADB_SATYPE_MAX) |
1691 | return -EINVAL; |
1692 | |
1693 | if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) { |
1694 | if (pfk->registered&(1<<hdr->sadb_msg_satype)) |
1695 | return -EEXIST; |
1696 | pfk->registered |= (1<<hdr->sadb_msg_satype); |
1697 | } |
1698 | |
1699 | mutex_lock(&pfkey_mutex); |
1700 | xfrm_probe_algs(); |
1701 | |
1702 | supp_skb = compose_sadb_supported(orig: hdr, GFP_KERNEL | __GFP_ZERO); |
1703 | mutex_unlock(lock: &pfkey_mutex); |
1704 | |
1705 | if (!supp_skb) { |
1706 | if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) |
1707 | pfk->registered &= ~(1<<hdr->sadb_msg_satype); |
1708 | |
1709 | return -ENOBUFS; |
1710 | } |
1711 | |
1712 | pfkey_broadcast(skb: supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, one_sk: sk, |
1713 | net: sock_net(sk)); |
1714 | return 0; |
1715 | } |
1716 | |
1717 | static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr) |
1718 | { |
1719 | struct sk_buff *skb; |
1720 | struct sadb_msg *hdr; |
1721 | |
1722 | skb = alloc_skb(size: sizeof(struct sadb_msg) + 16, GFP_ATOMIC); |
1723 | if (!skb) |
1724 | return -ENOBUFS; |
1725 | |
1726 | hdr = skb_put_data(skb, data: ihdr, len: sizeof(struct sadb_msg)); |
1727 | hdr->sadb_msg_errno = (uint8_t) 0; |
1728 | hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t)); |
1729 | |
1730 | return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ONE, one_sk: sk, |
1731 | net: sock_net(sk)); |
1732 | } |
1733 | |
1734 | static int key_notify_sa_flush(const struct km_event *c) |
1735 | { |
1736 | struct sk_buff *skb; |
1737 | struct sadb_msg *hdr; |
1738 | |
1739 | skb = alloc_skb(size: sizeof(struct sadb_msg) + 16, GFP_ATOMIC); |
1740 | if (!skb) |
1741 | return -ENOBUFS; |
1742 | hdr = skb_put(skb, len: sizeof(struct sadb_msg)); |
1743 | hdr->sadb_msg_satype = pfkey_proto2satype(proto: c->data.proto); |
1744 | hdr->sadb_msg_type = SADB_FLUSH; |
1745 | hdr->sadb_msg_seq = c->seq; |
1746 | hdr->sadb_msg_pid = c->portid; |
1747 | hdr->sadb_msg_version = PF_KEY_V2; |
1748 | hdr->sadb_msg_errno = (uint8_t) 0; |
1749 | hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t)); |
1750 | hdr->sadb_msg_reserved = 0; |
1751 | |
1752 | pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, net: c->net); |
1753 | |
1754 | return 0; |
1755 | } |
1756 | |
1757 | static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) |
1758 | { |
1759 | struct net *net = sock_net(sk); |
1760 | unsigned int proto; |
1761 | struct km_event c; |
1762 | int err, err2; |
1763 | |
1764 | proto = pfkey_satype2proto(satype: hdr->sadb_msg_satype); |
1765 | if (proto == 0) |
1766 | return -EINVAL; |
1767 | |
1768 | err = xfrm_state_flush(net, proto, task_valid: true, sync: false); |
1769 | err2 = unicast_flush_resp(sk, ihdr: hdr); |
1770 | if (err || err2) { |
1771 | if (err == -ESRCH) /* empty table - go quietly */ |
1772 | err = 0; |
1773 | return err ? err : err2; |
1774 | } |
1775 | |
1776 | c.data.proto = proto; |
1777 | c.seq = hdr->sadb_msg_seq; |
1778 | c.portid = hdr->sadb_msg_pid; |
1779 | c.event = XFRM_MSG_FLUSHSA; |
1780 | c.net = net; |
1781 | km_state_notify(NULL, c: &c); |
1782 | |
1783 | return 0; |
1784 | } |
1785 | |
1786 | static int dump_sa(struct xfrm_state *x, int count, void *ptr) |
1787 | { |
1788 | struct pfkey_sock *pfk = ptr; |
1789 | struct sk_buff *out_skb; |
1790 | struct sadb_msg *out_hdr; |
1791 | |
1792 | if (!pfkey_can_dump(sk: &pfk->sk)) |
1793 | return -ENOBUFS; |
1794 | |
1795 | out_skb = pfkey_xfrm_state2msg(x); |
1796 | if (IS_ERR(ptr: out_skb)) |
1797 | return PTR_ERR(ptr: out_skb); |
1798 | |
1799 | out_hdr = (struct sadb_msg *) out_skb->data; |
1800 | out_hdr->sadb_msg_version = pfk->dump.msg_version; |
1801 | out_hdr->sadb_msg_type = SADB_DUMP; |
1802 | out_hdr->sadb_msg_satype = pfkey_proto2satype(proto: x->id.proto); |
1803 | out_hdr->sadb_msg_errno = 0; |
1804 | out_hdr->sadb_msg_reserved = 0; |
1805 | out_hdr->sadb_msg_seq = count + 1; |
1806 | out_hdr->sadb_msg_pid = pfk->dump.msg_portid; |
1807 | |
1808 | if (pfk->dump.skb) |
1809 | pfkey_broadcast(skb: pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE, |
1810 | one_sk: &pfk->sk, net: sock_net(sk: &pfk->sk)); |
1811 | pfk->dump.skb = out_skb; |
1812 | |
1813 | return 0; |
1814 | } |
1815 | |
1816 | static int pfkey_dump_sa(struct pfkey_sock *pfk) |
1817 | { |
1818 | struct net *net = sock_net(sk: &pfk->sk); |
1819 | return xfrm_state_walk(net, walk: &pfk->dump.u.state, func: dump_sa, (void *) pfk); |
1820 | } |
1821 | |
1822 | static void pfkey_dump_sa_done(struct pfkey_sock *pfk) |
1823 | { |
1824 | struct net *net = sock_net(sk: &pfk->sk); |
1825 | |
1826 | xfrm_state_walk_done(walk: &pfk->dump.u.state, net); |
1827 | } |
1828 | |
1829 | static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) |
1830 | { |
1831 | u8 proto; |
1832 | struct xfrm_address_filter *filter = NULL; |
1833 | struct pfkey_sock *pfk = pfkey_sk(sk); |
1834 | |
1835 | mutex_lock(&pfk->dump_lock); |
1836 | if (pfk->dump.dump != NULL) { |
1837 | mutex_unlock(lock: &pfk->dump_lock); |
1838 | return -EBUSY; |
1839 | } |
1840 | |
1841 | proto = pfkey_satype2proto(satype: hdr->sadb_msg_satype); |
1842 | if (proto == 0) { |
1843 | mutex_unlock(lock: &pfk->dump_lock); |
1844 | return -EINVAL; |
1845 | } |
1846 | |
1847 | if (ext_hdrs[SADB_X_EXT_FILTER - 1]) { |
1848 | struct sadb_x_filter *xfilter = ext_hdrs[SADB_X_EXT_FILTER - 1]; |
1849 | |
1850 | if ((xfilter->sadb_x_filter_splen > |
1851 | (sizeof(xfrm_address_t) << 3)) || |
1852 | (xfilter->sadb_x_filter_dplen > |
1853 | (sizeof(xfrm_address_t) << 3))) { |
1854 | mutex_unlock(lock: &pfk->dump_lock); |
1855 | return -EINVAL; |
1856 | } |
1857 | filter = kmalloc(size: sizeof(*filter), GFP_KERNEL); |
1858 | if (filter == NULL) { |
1859 | mutex_unlock(lock: &pfk->dump_lock); |
1860 | return -ENOMEM; |
1861 | } |
1862 | |
1863 | memcpy(&filter->saddr, &xfilter->sadb_x_filter_saddr, |
1864 | sizeof(xfrm_address_t)); |
1865 | memcpy(&filter->daddr, &xfilter->sadb_x_filter_daddr, |
1866 | sizeof(xfrm_address_t)); |
1867 | filter->family = xfilter->sadb_x_filter_family; |
1868 | filter->splen = xfilter->sadb_x_filter_splen; |
1869 | filter->dplen = xfilter->sadb_x_filter_dplen; |
1870 | } |
1871 | |
1872 | pfk->dump.msg_version = hdr->sadb_msg_version; |
1873 | pfk->dump.msg_portid = hdr->sadb_msg_pid; |
1874 | pfk->dump.dump = pfkey_dump_sa; |
1875 | pfk->dump.done = pfkey_dump_sa_done; |
1876 | xfrm_state_walk_init(walk: &pfk->dump.u.state, proto, filter); |
1877 | mutex_unlock(lock: &pfk->dump_lock); |
1878 | |
1879 | return pfkey_do_dump(pfk); |
1880 | } |
1881 | |
1882 | static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) |
1883 | { |
1884 | struct pfkey_sock *pfk = pfkey_sk(sk); |
1885 | int satype = hdr->sadb_msg_satype; |
1886 | bool reset_errno = false; |
1887 | |
1888 | if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) { |
1889 | reset_errno = true; |
1890 | if (satype != 0 && satype != 1) |
1891 | return -EINVAL; |
1892 | pfk->promisc = satype; |
1893 | } |
1894 | if (reset_errno && skb_cloned(skb)) |
1895 | skb = skb_copy(skb, GFP_KERNEL); |
1896 | else |
1897 | skb = skb_clone(skb, GFP_KERNEL); |
1898 | |
1899 | if (reset_errno && skb) { |
1900 | struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data; |
1901 | new_hdr->sadb_msg_errno = 0; |
1902 | } |
1903 | |
1904 | pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ALL, NULL, net: sock_net(sk)); |
1905 | return 0; |
1906 | } |
1907 | |
1908 | static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr) |
1909 | { |
1910 | int i; |
1911 | u32 reqid = *(u32*)ptr; |
1912 | |
1913 | for (i=0; i<xp->xfrm_nr; i++) { |
1914 | if (xp->xfrm_vec[i].reqid == reqid) |
1915 | return -EEXIST; |
1916 | } |
1917 | return 0; |
1918 | } |
1919 | |
1920 | static u32 gen_reqid(struct net *net) |
1921 | { |
1922 | struct xfrm_policy_walk walk; |
1923 | u32 start; |
1924 | int rc; |
1925 | static u32 reqid = IPSEC_MANUAL_REQID_MAX; |
1926 | |
1927 | start = reqid; |
1928 | do { |
1929 | ++reqid; |
1930 | if (reqid == 0) |
1931 | reqid = IPSEC_MANUAL_REQID_MAX+1; |
1932 | xfrm_policy_walk_init(walk: &walk, type: XFRM_POLICY_TYPE_MAIN); |
1933 | rc = xfrm_policy_walk(net, walk: &walk, func: check_reqid, (void*)&reqid); |
1934 | xfrm_policy_walk_done(walk: &walk, net); |
1935 | if (rc != -EEXIST) |
1936 | return reqid; |
1937 | } while (reqid != start); |
1938 | return 0; |
1939 | } |
1940 | |
1941 | static int |
1942 | parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_policy *pol, |
1943 | struct sadb_x_ipsecrequest *rq) |
1944 | { |
1945 | struct net *net = xp_net(xp); |
1946 | struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr; |
1947 | int mode; |
1948 | |
1949 | if (xp->xfrm_nr >= XFRM_MAX_DEPTH) |
1950 | return -ELOOP; |
1951 | |
1952 | if (rq->sadb_x_ipsecrequest_mode == 0) |
1953 | return -EINVAL; |
1954 | if (!xfrm_id_proto_valid(proto: rq->sadb_x_ipsecrequest_proto)) |
1955 | return -EINVAL; |
1956 | |
1957 | t->id.proto = rq->sadb_x_ipsecrequest_proto; |
1958 | if ((mode = pfkey_mode_to_xfrm(mode: rq->sadb_x_ipsecrequest_mode)) < 0) |
1959 | return -EINVAL; |
1960 | t->mode = mode; |
1961 | if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE) { |
1962 | if ((mode == XFRM_MODE_TUNNEL || mode == XFRM_MODE_BEET) && |
1963 | pol->sadb_x_policy_dir == IPSEC_DIR_OUTBOUND) |
1964 | return -EINVAL; |
1965 | t->optional = 1; |
1966 | } else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) { |
1967 | t->reqid = rq->sadb_x_ipsecrequest_reqid; |
1968 | if (t->reqid > IPSEC_MANUAL_REQID_MAX) |
1969 | t->reqid = 0; |
1970 | if (!t->reqid && !(t->reqid = gen_reqid(net))) |
1971 | return -ENOBUFS; |
1972 | } |
1973 | |
1974 | /* addresses present only in tunnel mode */ |
1975 | if (t->mode == XFRM_MODE_TUNNEL) { |
1976 | int err; |
1977 | |
1978 | err = parse_sockaddr_pair( |
1979 | sa: (struct sockaddr *)(rq + 1), |
1980 | ext_len: rq->sadb_x_ipsecrequest_len - sizeof(*rq), |
1981 | saddr: &t->saddr, daddr: &t->id.daddr, family: &t->encap_family); |
1982 | if (err) |
1983 | return err; |
1984 | } else |
1985 | t->encap_family = xp->family; |
1986 | |
1987 | /* No way to set this via kame pfkey */ |
1988 | t->allalgs = 1; |
1989 | xp->xfrm_nr++; |
1990 | return 0; |
1991 | } |
1992 | |
1993 | static int |
1994 | parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol) |
1995 | { |
1996 | int err; |
1997 | int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy); |
1998 | struct sadb_x_ipsecrequest *rq = (void*)(pol+1); |
1999 | |
2000 | if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy)) |
2001 | return -EINVAL; |
2002 | |
2003 | while (len >= sizeof(*rq)) { |
2004 | if (len < rq->sadb_x_ipsecrequest_len || |
2005 | rq->sadb_x_ipsecrequest_len < sizeof(*rq)) |
2006 | return -EINVAL; |
2007 | |
2008 | if ((err = parse_ipsecrequest(xp, pol, rq)) < 0) |
2009 | return err; |
2010 | len -= rq->sadb_x_ipsecrequest_len; |
2011 | rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len); |
2012 | } |
2013 | return 0; |
2014 | } |
2015 | |
2016 | static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp) |
2017 | { |
2018 | struct xfrm_sec_ctx *xfrm_ctx = xp->security; |
2019 | |
2020 | if (xfrm_ctx) { |
2021 | int len = sizeof(struct sadb_x_sec_ctx); |
2022 | len += xfrm_ctx->ctx_len; |
2023 | return PFKEY_ALIGN8(len); |
2024 | } |
2025 | return 0; |
2026 | } |
2027 | |
2028 | static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp) |
2029 | { |
2030 | const struct xfrm_tmpl *t; |
2031 | int sockaddr_size = pfkey_sockaddr_size(family: xp->family); |
2032 | int socklen = 0; |
2033 | int i; |
2034 | |
2035 | for (i=0; i<xp->xfrm_nr; i++) { |
2036 | t = xp->xfrm_vec + i; |
2037 | socklen += pfkey_sockaddr_len(family: t->encap_family); |
2038 | } |
2039 | |
2040 | return sizeof(struct sadb_msg) + |
2041 | (sizeof(struct sadb_lifetime) * 3) + |
2042 | (sizeof(struct sadb_address) * 2) + |
2043 | (sockaddr_size * 2) + |
2044 | sizeof(struct sadb_x_policy) + |
2045 | (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) + |
2046 | (socklen * 2) + |
2047 | pfkey_xfrm_policy2sec_ctx_size(xp); |
2048 | } |
2049 | |
2050 | static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp) |
2051 | { |
2052 | struct sk_buff *skb; |
2053 | int size; |
2054 | |
2055 | size = pfkey_xfrm_policy2msg_size(xp); |
2056 | |
2057 | skb = alloc_skb(size: size + 16, GFP_ATOMIC); |
2058 | if (skb == NULL) |
2059 | return ERR_PTR(error: -ENOBUFS); |
2060 | |
2061 | return skb; |
2062 | } |
2063 | |
2064 | static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir) |
2065 | { |
2066 | struct sadb_msg *hdr; |
2067 | struct sadb_address *addr; |
2068 | struct sadb_lifetime *lifetime; |
2069 | struct sadb_x_policy *pol; |
2070 | struct sadb_x_sec_ctx *sec_ctx; |
2071 | struct xfrm_sec_ctx *xfrm_ctx; |
2072 | int i; |
2073 | int size; |
2074 | int sockaddr_size = pfkey_sockaddr_size(family: xp->family); |
2075 | int socklen = pfkey_sockaddr_len(family: xp->family); |
2076 | |
2077 | size = pfkey_xfrm_policy2msg_size(xp); |
2078 | |
2079 | /* call should fill header later */ |
2080 | hdr = skb_put(skb, len: sizeof(struct sadb_msg)); |
2081 | memset(hdr, 0, size); /* XXX do we need this ? */ |
2082 | |
2083 | /* src address */ |
2084 | addr = skb_put(skb, len: sizeof(struct sadb_address) + sockaddr_size); |
2085 | addr->sadb_address_len = |
2086 | (sizeof(struct sadb_address)+sockaddr_size)/ |
2087 | sizeof(uint64_t); |
2088 | addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; |
2089 | addr->sadb_address_proto = pfkey_proto_from_xfrm(proto: xp->selector.proto); |
2090 | addr->sadb_address_prefixlen = xp->selector.prefixlen_s; |
2091 | addr->sadb_address_reserved = 0; |
2092 | if (!pfkey_sockaddr_fill(xaddr: &xp->selector.saddr, |
2093 | port: xp->selector.sport, |
2094 | sa: (struct sockaddr *) (addr + 1), |
2095 | family: xp->family)) |
2096 | BUG(); |
2097 | |
2098 | /* dst address */ |
2099 | addr = skb_put(skb, len: sizeof(struct sadb_address) + sockaddr_size); |
2100 | addr->sadb_address_len = |
2101 | (sizeof(struct sadb_address)+sockaddr_size)/ |
2102 | sizeof(uint64_t); |
2103 | addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; |
2104 | addr->sadb_address_proto = pfkey_proto_from_xfrm(proto: xp->selector.proto); |
2105 | addr->sadb_address_prefixlen = xp->selector.prefixlen_d; |
2106 | addr->sadb_address_reserved = 0; |
2107 | |
2108 | pfkey_sockaddr_fill(xaddr: &xp->selector.daddr, port: xp->selector.dport, |
2109 | sa: (struct sockaddr *) (addr + 1), |
2110 | family: xp->family); |
2111 | |
2112 | /* hard time */ |
2113 | lifetime = skb_put(skb, len: sizeof(struct sadb_lifetime)); |
2114 | lifetime->sadb_lifetime_len = |
2115 | sizeof(struct sadb_lifetime)/sizeof(uint64_t); |
2116 | lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD; |
2117 | lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.hard_packet_limit); |
2118 | lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit); |
2119 | lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds; |
2120 | lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds; |
2121 | /* soft time */ |
2122 | lifetime = skb_put(skb, len: sizeof(struct sadb_lifetime)); |
2123 | lifetime->sadb_lifetime_len = |
2124 | sizeof(struct sadb_lifetime)/sizeof(uint64_t); |
2125 | lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT; |
2126 | lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.soft_packet_limit); |
2127 | lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit); |
2128 | lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds; |
2129 | lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds; |
2130 | /* current time */ |
2131 | lifetime = skb_put(skb, len: sizeof(struct sadb_lifetime)); |
2132 | lifetime->sadb_lifetime_len = |
2133 | sizeof(struct sadb_lifetime)/sizeof(uint64_t); |
2134 | lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; |
2135 | lifetime->sadb_lifetime_allocations = xp->curlft.packets; |
2136 | lifetime->sadb_lifetime_bytes = xp->curlft.bytes; |
2137 | lifetime->sadb_lifetime_addtime = xp->curlft.add_time; |
2138 | lifetime->sadb_lifetime_usetime = xp->curlft.use_time; |
2139 | |
2140 | pol = skb_put(skb, len: sizeof(struct sadb_x_policy)); |
2141 | pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t); |
2142 | pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; |
2143 | pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD; |
2144 | if (xp->action == XFRM_POLICY_ALLOW) { |
2145 | if (xp->xfrm_nr) |
2146 | pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; |
2147 | else |
2148 | pol->sadb_x_policy_type = IPSEC_POLICY_NONE; |
2149 | } |
2150 | pol->sadb_x_policy_dir = dir+1; |
2151 | pol->sadb_x_policy_reserved = 0; |
2152 | pol->sadb_x_policy_id = xp->index; |
2153 | pol->sadb_x_policy_priority = xp->priority; |
2154 | |
2155 | for (i=0; i<xp->xfrm_nr; i++) { |
2156 | const struct xfrm_tmpl *t = xp->xfrm_vec + i; |
2157 | struct sadb_x_ipsecrequest *rq; |
2158 | int req_size; |
2159 | int mode; |
2160 | |
2161 | req_size = sizeof(struct sadb_x_ipsecrequest); |
2162 | if (t->mode == XFRM_MODE_TUNNEL) { |
2163 | socklen = pfkey_sockaddr_len(family: t->encap_family); |
2164 | req_size += socklen * 2; |
2165 | } else { |
2166 | size -= 2*socklen; |
2167 | } |
2168 | rq = skb_put(skb, len: req_size); |
2169 | pol->sadb_x_policy_len += req_size/8; |
2170 | memset(rq, 0, sizeof(*rq)); |
2171 | rq->sadb_x_ipsecrequest_len = req_size; |
2172 | rq->sadb_x_ipsecrequest_proto = t->id.proto; |
2173 | if ((mode = pfkey_mode_from_xfrm(mode: t->mode)) < 0) |
2174 | return -EINVAL; |
2175 | rq->sadb_x_ipsecrequest_mode = mode; |
2176 | rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE; |
2177 | if (t->reqid) |
2178 | rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE; |
2179 | if (t->optional) |
2180 | rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE; |
2181 | rq->sadb_x_ipsecrequest_reqid = t->reqid; |
2182 | |
2183 | if (t->mode == XFRM_MODE_TUNNEL) { |
2184 | u8 *sa = (void *)(rq + 1); |
2185 | pfkey_sockaddr_fill(xaddr: &t->saddr, port: 0, |
2186 | sa: (struct sockaddr *)sa, |
2187 | family: t->encap_family); |
2188 | pfkey_sockaddr_fill(xaddr: &t->id.daddr, port: 0, |
2189 | sa: (struct sockaddr *) (sa + socklen), |
2190 | family: t->encap_family); |
2191 | } |
2192 | } |
2193 | |
2194 | /* security context */ |
2195 | if ((xfrm_ctx = xp->security)) { |
2196 | int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp); |
2197 | |
2198 | sec_ctx = skb_put(skb, len: ctx_size); |
2199 | sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t); |
2200 | sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX; |
2201 | sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi; |
2202 | sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg; |
2203 | sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len; |
2204 | memcpy(sec_ctx + 1, xfrm_ctx->ctx_str, |
2205 | xfrm_ctx->ctx_len); |
2206 | } |
2207 | |
2208 | hdr->sadb_msg_len = size / sizeof(uint64_t); |
2209 | hdr->sadb_msg_reserved = refcount_read(r: &xp->refcnt); |
2210 | |
2211 | return 0; |
2212 | } |
2213 | |
2214 | static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c) |
2215 | { |
2216 | struct sk_buff *out_skb; |
2217 | struct sadb_msg *out_hdr; |
2218 | int err; |
2219 | |
2220 | out_skb = pfkey_xfrm_policy2msg_prep(xp); |
2221 | if (IS_ERR(ptr: out_skb)) |
2222 | return PTR_ERR(ptr: out_skb); |
2223 | |
2224 | err = pfkey_xfrm_policy2msg(skb: out_skb, xp, dir); |
2225 | if (err < 0) { |
2226 | kfree_skb(skb: out_skb); |
2227 | return err; |
2228 | } |
2229 | |
2230 | out_hdr = (struct sadb_msg *) out_skb->data; |
2231 | out_hdr->sadb_msg_version = PF_KEY_V2; |
2232 | |
2233 | if (c->data.byid && c->event == XFRM_MSG_DELPOLICY) |
2234 | out_hdr->sadb_msg_type = SADB_X_SPDDELETE2; |
2235 | else |
2236 | out_hdr->sadb_msg_type = event2poltype(event: c->event); |
2237 | out_hdr->sadb_msg_errno = 0; |
2238 | out_hdr->sadb_msg_seq = c->seq; |
2239 | out_hdr->sadb_msg_pid = c->portid; |
2240 | pfkey_broadcast(skb: out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, net: xp_net(xp)); |
2241 | return 0; |
2242 | |
2243 | } |
2244 | |
2245 | static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) |
2246 | { |
2247 | struct net *net = sock_net(sk); |
2248 | int err = 0; |
2249 | struct sadb_lifetime *lifetime; |
2250 | struct sadb_address *sa; |
2251 | struct sadb_x_policy *pol; |
2252 | struct xfrm_policy *xp; |
2253 | struct km_event c; |
2254 | struct sadb_x_sec_ctx *sec_ctx; |
2255 | |
2256 | if (!present_and_same_family(src: ext_hdrs[SADB_EXT_ADDRESS_SRC-1], |
2257 | dst: ext_hdrs[SADB_EXT_ADDRESS_DST-1]) || |
2258 | !ext_hdrs[SADB_X_EXT_POLICY-1]) |
2259 | return -EINVAL; |
2260 | |
2261 | pol = ext_hdrs[SADB_X_EXT_POLICY-1]; |
2262 | if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC) |
2263 | return -EINVAL; |
2264 | if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) |
2265 | return -EINVAL; |
2266 | |
2267 | xp = xfrm_policy_alloc(net, GFP_KERNEL); |
2268 | if (xp == NULL) |
2269 | return -ENOBUFS; |
2270 | |
2271 | xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ? |
2272 | XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW); |
2273 | xp->priority = pol->sadb_x_policy_priority; |
2274 | |
2275 | sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1]; |
2276 | xp->family = pfkey_sadb_addr2xfrm_addr(addr: sa, xaddr: &xp->selector.saddr); |
2277 | xp->selector.family = xp->family; |
2278 | xp->selector.prefixlen_s = sa->sadb_address_prefixlen; |
2279 | xp->selector.proto = pfkey_proto_to_xfrm(proto: sa->sadb_address_proto); |
2280 | xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port; |
2281 | if (xp->selector.sport) |
2282 | xp->selector.sport_mask = htons(0xffff); |
2283 | |
2284 | sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1]; |
2285 | pfkey_sadb_addr2xfrm_addr(addr: sa, xaddr: &xp->selector.daddr); |
2286 | xp->selector.prefixlen_d = sa->sadb_address_prefixlen; |
2287 | |
2288 | /* Amusing, we set this twice. KAME apps appear to set same value |
2289 | * in both addresses. |
2290 | */ |
2291 | xp->selector.proto = pfkey_proto_to_xfrm(proto: sa->sadb_address_proto); |
2292 | |
2293 | xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port; |
2294 | if (xp->selector.dport) |
2295 | xp->selector.dport_mask = htons(0xffff); |
2296 | |
2297 | sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1]; |
2298 | if (sec_ctx != NULL) { |
2299 | struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL); |
2300 | |
2301 | if (!uctx) { |
2302 | err = -ENOBUFS; |
2303 | goto out; |
2304 | } |
2305 | |
2306 | err = security_xfrm_policy_alloc(ctxp: &xp->security, sec_ctx: uctx, GFP_KERNEL); |
2307 | kfree(objp: uctx); |
2308 | |
2309 | if (err) |
2310 | goto out; |
2311 | } |
2312 | |
2313 | xp->lft.soft_byte_limit = XFRM_INF; |
2314 | xp->lft.hard_byte_limit = XFRM_INF; |
2315 | xp->lft.soft_packet_limit = XFRM_INF; |
2316 | xp->lft.hard_packet_limit = XFRM_INF; |
2317 | if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) { |
2318 | xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); |
2319 | xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); |
2320 | xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime; |
2321 | xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime; |
2322 | } |
2323 | if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) { |
2324 | xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); |
2325 | xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); |
2326 | xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime; |
2327 | xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime; |
2328 | } |
2329 | xp->xfrm_nr = 0; |
2330 | if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC && |
2331 | (err = parse_ipsecrequests(xp, pol)) < 0) |
2332 | goto out; |
2333 | |
2334 | err = xfrm_policy_insert(dir: pol->sadb_x_policy_dir-1, policy: xp, |
2335 | excl: hdr->sadb_msg_type != SADB_X_SPDUPDATE); |
2336 | |
2337 | xfrm_audit_policy_add(xp, result: err ? 0 : 1, task_valid: true); |
2338 | |
2339 | if (err) |
2340 | goto out; |
2341 | |
2342 | if (hdr->sadb_msg_type == SADB_X_SPDUPDATE) |
2343 | c.event = XFRM_MSG_UPDPOLICY; |
2344 | else |
2345 | c.event = XFRM_MSG_NEWPOLICY; |
2346 | |
2347 | c.seq = hdr->sadb_msg_seq; |
2348 | c.portid = hdr->sadb_msg_pid; |
2349 | |
2350 | km_policy_notify(xp, dir: pol->sadb_x_policy_dir-1, c: &c); |
2351 | xfrm_pol_put(policy: xp); |
2352 | return 0; |
2353 | |
2354 | out: |
2355 | xp->walk.dead = 1; |
2356 | xfrm_policy_destroy(policy: xp); |
2357 | return err; |
2358 | } |
2359 | |
2360 | static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) |
2361 | { |
2362 | struct net *net = sock_net(sk); |
2363 | int err; |
2364 | struct sadb_address *sa; |
2365 | struct sadb_x_policy *pol; |
2366 | struct xfrm_policy *xp; |
2367 | struct xfrm_selector sel; |
2368 | struct km_event c; |
2369 | struct sadb_x_sec_ctx *sec_ctx; |
2370 | struct xfrm_sec_ctx *pol_ctx = NULL; |
2371 | |
2372 | if (!present_and_same_family(src: ext_hdrs[SADB_EXT_ADDRESS_SRC-1], |
2373 | dst: ext_hdrs[SADB_EXT_ADDRESS_DST-1]) || |
2374 | !ext_hdrs[SADB_X_EXT_POLICY-1]) |
2375 | return -EINVAL; |
2376 | |
2377 | pol = ext_hdrs[SADB_X_EXT_POLICY-1]; |
2378 | if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) |
2379 | return -EINVAL; |
2380 | |
2381 | memset(&sel, 0, sizeof(sel)); |
2382 | |
2383 | sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1]; |
2384 | sel.family = pfkey_sadb_addr2xfrm_addr(addr: sa, xaddr: &sel.saddr); |
2385 | sel.prefixlen_s = sa->sadb_address_prefixlen; |
2386 | sel.proto = pfkey_proto_to_xfrm(proto: sa->sadb_address_proto); |
2387 | sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port; |
2388 | if (sel.sport) |
2389 | sel.sport_mask = htons(0xffff); |
2390 | |
2391 | sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1]; |
2392 | pfkey_sadb_addr2xfrm_addr(addr: sa, xaddr: &sel.daddr); |
2393 | sel.prefixlen_d = sa->sadb_address_prefixlen; |
2394 | sel.proto = pfkey_proto_to_xfrm(proto: sa->sadb_address_proto); |
2395 | sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port; |
2396 | if (sel.dport) |
2397 | sel.dport_mask = htons(0xffff); |
2398 | |
2399 | sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1]; |
2400 | if (sec_ctx != NULL) { |
2401 | struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL); |
2402 | |
2403 | if (!uctx) |
2404 | return -ENOMEM; |
2405 | |
2406 | err = security_xfrm_policy_alloc(ctxp: &pol_ctx, sec_ctx: uctx, GFP_KERNEL); |
2407 | kfree(objp: uctx); |
2408 | if (err) |
2409 | return err; |
2410 | } |
2411 | |
2412 | xp = xfrm_policy_bysel_ctx(net, mark: &dummy_mark, if_id: 0, type: XFRM_POLICY_TYPE_MAIN, |
2413 | dir: pol->sadb_x_policy_dir - 1, sel: &sel, ctx: pol_ctx, |
2414 | delete: 1, err: &err); |
2415 | security_xfrm_policy_free(ctx: pol_ctx); |
2416 | if (xp == NULL) |
2417 | return -ENOENT; |
2418 | |
2419 | xfrm_audit_policy_delete(xp, result: err ? 0 : 1, task_valid: true); |
2420 | |
2421 | if (err) |
2422 | goto out; |
2423 | |
2424 | c.seq = hdr->sadb_msg_seq; |
2425 | c.portid = hdr->sadb_msg_pid; |
2426 | c.data.byid = 0; |
2427 | c.event = XFRM_MSG_DELPOLICY; |
2428 | km_policy_notify(xp, dir: pol->sadb_x_policy_dir-1, c: &c); |
2429 | |
2430 | out: |
2431 | xfrm_pol_put(policy: xp); |
2432 | return err; |
2433 | } |
2434 | |
2435 | static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir) |
2436 | { |
2437 | int err; |
2438 | struct sk_buff *out_skb; |
2439 | struct sadb_msg *out_hdr; |
2440 | err = 0; |
2441 | |
2442 | out_skb = pfkey_xfrm_policy2msg_prep(xp); |
2443 | if (IS_ERR(ptr: out_skb)) { |
2444 | err = PTR_ERR(ptr: out_skb); |
2445 | goto out; |
2446 | } |
2447 | err = pfkey_xfrm_policy2msg(skb: out_skb, xp, dir); |
2448 | if (err < 0) { |
2449 | kfree_skb(skb: out_skb); |
2450 | goto out; |
2451 | } |
2452 | |
2453 | out_hdr = (struct sadb_msg *) out_skb->data; |
2454 | out_hdr->sadb_msg_version = hdr->sadb_msg_version; |
2455 | out_hdr->sadb_msg_type = hdr->sadb_msg_type; |
2456 | out_hdr->sadb_msg_satype = 0; |
2457 | out_hdr->sadb_msg_errno = 0; |
2458 | out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; |
2459 | out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; |
2460 | pfkey_broadcast(skb: out_skb, GFP_ATOMIC, BROADCAST_ONE, one_sk: sk, net: xp_net(xp)); |
2461 | err = 0; |
2462 | |
2463 | out: |
2464 | return err; |
2465 | } |
2466 | |
2467 | static int pfkey_sockaddr_pair_size(sa_family_t family) |
2468 | { |
2469 | return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2); |
2470 | } |
2471 | |
2472 | static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len, |
2473 | xfrm_address_t *saddr, xfrm_address_t *daddr, |
2474 | u16 *family) |
2475 | { |
2476 | int af, socklen; |
2477 | |
2478 | if (ext_len < 2 || ext_len < pfkey_sockaddr_pair_size(family: sa->sa_family)) |
2479 | return -EINVAL; |
2480 | |
2481 | af = pfkey_sockaddr_extract(sa, xaddr: saddr); |
2482 | if (!af) |
2483 | return -EINVAL; |
2484 | |
2485 | socklen = pfkey_sockaddr_len(family: af); |
2486 | if (pfkey_sockaddr_extract(sa: (struct sockaddr *) (((u8 *)sa) + socklen), |
2487 | xaddr: daddr) != af) |
2488 | return -EINVAL; |
2489 | |
2490 | *family = af; |
2491 | return 0; |
2492 | } |
2493 | |
2494 | #ifdef CONFIG_NET_KEY_MIGRATE |
2495 | static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len, |
2496 | struct xfrm_migrate *m) |
2497 | { |
2498 | int err; |
2499 | struct sadb_x_ipsecrequest *rq2; |
2500 | int mode; |
2501 | |
2502 | if (len < sizeof(*rq1) || |
2503 | len < rq1->sadb_x_ipsecrequest_len || |
2504 | rq1->sadb_x_ipsecrequest_len < sizeof(*rq1)) |
2505 | return -EINVAL; |
2506 | |
2507 | /* old endoints */ |
2508 | err = parse_sockaddr_pair(sa: (struct sockaddr *)(rq1 + 1), |
2509 | ext_len: rq1->sadb_x_ipsecrequest_len - sizeof(*rq1), |
2510 | saddr: &m->old_saddr, daddr: &m->old_daddr, |
2511 | family: &m->old_family); |
2512 | if (err) |
2513 | return err; |
2514 | |
2515 | rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len); |
2516 | len -= rq1->sadb_x_ipsecrequest_len; |
2517 | |
2518 | if (len <= sizeof(*rq2) || |
2519 | len < rq2->sadb_x_ipsecrequest_len || |
2520 | rq2->sadb_x_ipsecrequest_len < sizeof(*rq2)) |
2521 | return -EINVAL; |
2522 | |
2523 | /* new endpoints */ |
2524 | err = parse_sockaddr_pair(sa: (struct sockaddr *)(rq2 + 1), |
2525 | ext_len: rq2->sadb_x_ipsecrequest_len - sizeof(*rq2), |
2526 | saddr: &m->new_saddr, daddr: &m->new_daddr, |
2527 | family: &m->new_family); |
2528 | if (err) |
2529 | return err; |
2530 | |
2531 | if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto || |
2532 | rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode || |
2533 | rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid) |
2534 | return -EINVAL; |
2535 | |
2536 | m->proto = rq1->sadb_x_ipsecrequest_proto; |
2537 | if ((mode = pfkey_mode_to_xfrm(mode: rq1->sadb_x_ipsecrequest_mode)) < 0) |
2538 | return -EINVAL; |
2539 | m->mode = mode; |
2540 | m->reqid = rq1->sadb_x_ipsecrequest_reqid; |
2541 | |
2542 | return ((int)(rq1->sadb_x_ipsecrequest_len + |
2543 | rq2->sadb_x_ipsecrequest_len)); |
2544 | } |
2545 | |
2546 | static int pfkey_migrate(struct sock *sk, struct sk_buff *skb, |
2547 | const struct sadb_msg *hdr, void * const *ext_hdrs) |
2548 | { |
2549 | int i, len, ret, err = -EINVAL; |
2550 | u8 dir; |
2551 | struct sadb_address *sa; |
2552 | struct sadb_x_kmaddress *kma; |
2553 | struct sadb_x_policy *pol; |
2554 | struct sadb_x_ipsecrequest *rq; |
2555 | struct xfrm_selector sel; |
2556 | struct xfrm_migrate m[XFRM_MAX_DEPTH]; |
2557 | struct xfrm_kmaddress k; |
2558 | struct net *net = sock_net(sk); |
2559 | |
2560 | if (!present_and_same_family(src: ext_hdrs[SADB_EXT_ADDRESS_SRC - 1], |
2561 | dst: ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) || |
2562 | !ext_hdrs[SADB_X_EXT_POLICY - 1]) { |
2563 | err = -EINVAL; |
2564 | goto out; |
2565 | } |
2566 | |
2567 | kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1]; |
2568 | pol = ext_hdrs[SADB_X_EXT_POLICY - 1]; |
2569 | |
2570 | if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) { |
2571 | err = -EINVAL; |
2572 | goto out; |
2573 | } |
2574 | |
2575 | if (kma) { |
2576 | /* convert sadb_x_kmaddress to xfrm_kmaddress */ |
2577 | k.reserved = kma->sadb_x_kmaddress_reserved; |
2578 | ret = parse_sockaddr_pair(sa: (struct sockaddr *)(kma + 1), |
2579 | ext_len: 8*(kma->sadb_x_kmaddress_len) - sizeof(*kma), |
2580 | saddr: &k.local, daddr: &k.remote, family: &k.family); |
2581 | if (ret < 0) { |
2582 | err = ret; |
2583 | goto out; |
2584 | } |
2585 | } |
2586 | |
2587 | dir = pol->sadb_x_policy_dir - 1; |
2588 | memset(&sel, 0, sizeof(sel)); |
2589 | |
2590 | /* set source address info of selector */ |
2591 | sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1]; |
2592 | sel.family = pfkey_sadb_addr2xfrm_addr(addr: sa, xaddr: &sel.saddr); |
2593 | sel.prefixlen_s = sa->sadb_address_prefixlen; |
2594 | sel.proto = pfkey_proto_to_xfrm(proto: sa->sadb_address_proto); |
2595 | sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port; |
2596 | if (sel.sport) |
2597 | sel.sport_mask = htons(0xffff); |
2598 | |
2599 | /* set destination address info of selector */ |
2600 | sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1]; |
2601 | pfkey_sadb_addr2xfrm_addr(addr: sa, xaddr: &sel.daddr); |
2602 | sel.prefixlen_d = sa->sadb_address_prefixlen; |
2603 | sel.proto = pfkey_proto_to_xfrm(proto: sa->sadb_address_proto); |
2604 | sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port; |
2605 | if (sel.dport) |
2606 | sel.dport_mask = htons(0xffff); |
2607 | |
2608 | rq = (struct sadb_x_ipsecrequest *)(pol + 1); |
2609 | |
2610 | /* extract ipsecrequests */ |
2611 | i = 0; |
2612 | len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy); |
2613 | |
2614 | while (len > 0 && i < XFRM_MAX_DEPTH) { |
2615 | ret = ipsecrequests_to_migrate(rq1: rq, len, m: &m[i]); |
2616 | if (ret < 0) { |
2617 | err = ret; |
2618 | goto out; |
2619 | } else { |
2620 | rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret); |
2621 | len -= ret; |
2622 | i++; |
2623 | } |
2624 | } |
2625 | |
2626 | if (!i || len > 0) { |
2627 | err = -EINVAL; |
2628 | goto out; |
2629 | } |
2630 | |
2631 | return xfrm_migrate(sel: &sel, dir, type: XFRM_POLICY_TYPE_MAIN, m, num_bundles: i, |
2632 | k: kma ? &k : NULL, net, NULL, if_id: 0, NULL); |
2633 | |
2634 | out: |
2635 | return err; |
2636 | } |
2637 | #else |
2638 | static int pfkey_migrate(struct sock *sk, struct sk_buff *skb, |
2639 | const struct sadb_msg *hdr, void * const *ext_hdrs) |
2640 | { |
2641 | return -ENOPROTOOPT; |
2642 | } |
2643 | #endif |
2644 | |
2645 | |
2646 | static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) |
2647 | { |
2648 | struct net *net = sock_net(sk); |
2649 | unsigned int dir; |
2650 | int err = 0, delete; |
2651 | struct sadb_x_policy *pol; |
2652 | struct xfrm_policy *xp; |
2653 | struct km_event c; |
2654 | |
2655 | if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL) |
2656 | return -EINVAL; |
2657 | |
2658 | dir = xfrm_policy_id2dir(index: pol->sadb_x_policy_id); |
2659 | if (dir >= XFRM_POLICY_MAX) |
2660 | return -EINVAL; |
2661 | |
2662 | delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2); |
2663 | xp = xfrm_policy_byid(net, mark: &dummy_mark, if_id: 0, type: XFRM_POLICY_TYPE_MAIN, |
2664 | dir, id: pol->sadb_x_policy_id, delete, err: &err); |
2665 | if (xp == NULL) |
2666 | return -ENOENT; |
2667 | |
2668 | if (delete) { |
2669 | xfrm_audit_policy_delete(xp, result: err ? 0 : 1, task_valid: true); |
2670 | |
2671 | if (err) |
2672 | goto out; |
2673 | c.seq = hdr->sadb_msg_seq; |
2674 | c.portid = hdr->sadb_msg_pid; |
2675 | c.data.byid = 1; |
2676 | c.event = XFRM_MSG_DELPOLICY; |
2677 | km_policy_notify(xp, dir, c: &c); |
2678 | } else { |
2679 | err = key_pol_get_resp(sk, xp, hdr, dir); |
2680 | } |
2681 | |
2682 | out: |
2683 | xfrm_pol_put(policy: xp); |
2684 | return err; |
2685 | } |
2686 | |
2687 | static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr) |
2688 | { |
2689 | struct pfkey_sock *pfk = ptr; |
2690 | struct sk_buff *out_skb; |
2691 | struct sadb_msg *out_hdr; |
2692 | int err; |
2693 | |
2694 | if (!pfkey_can_dump(sk: &pfk->sk)) |
2695 | return -ENOBUFS; |
2696 | |
2697 | out_skb = pfkey_xfrm_policy2msg_prep(xp); |
2698 | if (IS_ERR(ptr: out_skb)) |
2699 | return PTR_ERR(ptr: out_skb); |
2700 | |
2701 | err = pfkey_xfrm_policy2msg(skb: out_skb, xp, dir); |
2702 | if (err < 0) { |
2703 | kfree_skb(skb: out_skb); |
2704 | return err; |
2705 | } |
2706 | |
2707 | out_hdr = (struct sadb_msg *) out_skb->data; |
2708 | out_hdr->sadb_msg_version = pfk->dump.msg_version; |
2709 | out_hdr->sadb_msg_type = SADB_X_SPDDUMP; |
2710 | out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC; |
2711 | out_hdr->sadb_msg_errno = 0; |
2712 | out_hdr->sadb_msg_seq = count + 1; |
2713 | out_hdr->sadb_msg_pid = pfk->dump.msg_portid; |
2714 | |
2715 | if (pfk->dump.skb) |
2716 | pfkey_broadcast(skb: pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE, |
2717 | one_sk: &pfk->sk, net: sock_net(sk: &pfk->sk)); |
2718 | pfk->dump.skb = out_skb; |
2719 | |
2720 | return 0; |
2721 | } |
2722 | |
2723 | static int pfkey_dump_sp(struct pfkey_sock *pfk) |
2724 | { |
2725 | struct net *net = sock_net(sk: &pfk->sk); |
2726 | return xfrm_policy_walk(net, walk: &pfk->dump.u.policy, func: dump_sp, (void *) pfk); |
2727 | } |
2728 | |
2729 | static void pfkey_dump_sp_done(struct pfkey_sock *pfk) |
2730 | { |
2731 | struct net *net = sock_net(sk: (struct sock *)pfk); |
2732 | |
2733 | xfrm_policy_walk_done(walk: &pfk->dump.u.policy, net); |
2734 | } |
2735 | |
2736 | static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) |
2737 | { |
2738 | struct pfkey_sock *pfk = pfkey_sk(sk); |
2739 | |
2740 | mutex_lock(&pfk->dump_lock); |
2741 | if (pfk->dump.dump != NULL) { |
2742 | mutex_unlock(lock: &pfk->dump_lock); |
2743 | return -EBUSY; |
2744 | } |
2745 | |
2746 | pfk->dump.msg_version = hdr->sadb_msg_version; |
2747 | pfk->dump.msg_portid = hdr->sadb_msg_pid; |
2748 | pfk->dump.dump = pfkey_dump_sp; |
2749 | pfk->dump.done = pfkey_dump_sp_done; |
2750 | xfrm_policy_walk_init(walk: &pfk->dump.u.policy, type: XFRM_POLICY_TYPE_MAIN); |
2751 | mutex_unlock(lock: &pfk->dump_lock); |
2752 | |
2753 | return pfkey_do_dump(pfk); |
2754 | } |
2755 | |
2756 | static int key_notify_policy_flush(const struct km_event *c) |
2757 | { |
2758 | struct sk_buff *skb_out; |
2759 | struct sadb_msg *hdr; |
2760 | |
2761 | skb_out = alloc_skb(size: sizeof(struct sadb_msg) + 16, GFP_ATOMIC); |
2762 | if (!skb_out) |
2763 | return -ENOBUFS; |
2764 | hdr = skb_put(skb: skb_out, len: sizeof(struct sadb_msg)); |
2765 | hdr->sadb_msg_type = SADB_X_SPDFLUSH; |
2766 | hdr->sadb_msg_seq = c->seq; |
2767 | hdr->sadb_msg_pid = c->portid; |
2768 | hdr->sadb_msg_version = PF_KEY_V2; |
2769 | hdr->sadb_msg_errno = (uint8_t) 0; |
2770 | hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC; |
2771 | hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t)); |
2772 | hdr->sadb_msg_reserved = 0; |
2773 | pfkey_broadcast(skb: skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, net: c->net); |
2774 | return 0; |
2775 | |
2776 | } |
2777 | |
2778 | static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) |
2779 | { |
2780 | struct net *net = sock_net(sk); |
2781 | struct km_event c; |
2782 | int err, err2; |
2783 | |
2784 | err = xfrm_policy_flush(net, type: XFRM_POLICY_TYPE_MAIN, task_valid: true); |
2785 | err2 = unicast_flush_resp(sk, ihdr: hdr); |
2786 | if (err || err2) { |
2787 | if (err == -ESRCH) /* empty table - old silent behavior */ |
2788 | return 0; |
2789 | return err; |
2790 | } |
2791 | |
2792 | c.data.type = XFRM_POLICY_TYPE_MAIN; |
2793 | c.event = XFRM_MSG_FLUSHPOLICY; |
2794 | c.portid = hdr->sadb_msg_pid; |
2795 | c.seq = hdr->sadb_msg_seq; |
2796 | c.net = net; |
2797 | km_policy_notify(NULL, dir: 0, c: &c); |
2798 | |
2799 | return 0; |
2800 | } |
2801 | |
2802 | typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb, |
2803 | const struct sadb_msg *hdr, void * const *ext_hdrs); |
2804 | static const pfkey_handler pfkey_funcs[SADB_MAX + 1] = { |
2805 | [SADB_RESERVED] = pfkey_reserved, |
2806 | [SADB_GETSPI] = pfkey_getspi, |
2807 | [SADB_UPDATE] = pfkey_add, |
2808 | [SADB_ADD] = pfkey_add, |
2809 | [SADB_DELETE] = pfkey_delete, |
2810 | [SADB_GET] = pfkey_get, |
2811 | [SADB_ACQUIRE] = pfkey_acquire, |
2812 | [SADB_REGISTER] = pfkey_register, |
2813 | [SADB_EXPIRE] = NULL, |
2814 | [SADB_FLUSH] = pfkey_flush, |
2815 | [SADB_DUMP] = pfkey_dump, |
2816 | [SADB_X_PROMISC] = pfkey_promisc, |
2817 | [SADB_X_PCHANGE] = NULL, |
2818 | [SADB_X_SPDUPDATE] = pfkey_spdadd, |
2819 | [SADB_X_SPDADD] = pfkey_spdadd, |
2820 | [SADB_X_SPDDELETE] = pfkey_spddelete, |
2821 | [SADB_X_SPDGET] = pfkey_spdget, |
2822 | [SADB_X_SPDACQUIRE] = NULL, |
2823 | [SADB_X_SPDDUMP] = pfkey_spddump, |
2824 | [SADB_X_SPDFLUSH] = pfkey_spdflush, |
2825 | [SADB_X_SPDSETIDX] = pfkey_spdadd, |
2826 | [SADB_X_SPDDELETE2] = pfkey_spdget, |
2827 | [SADB_X_MIGRATE] = pfkey_migrate, |
2828 | }; |
2829 | |
2830 | static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr) |
2831 | { |
2832 | void *ext_hdrs[SADB_EXT_MAX]; |
2833 | int err; |
2834 | |
2835 | /* Non-zero return value of pfkey_broadcast() does not always signal |
2836 | * an error and even on an actual error we may still want to process |
2837 | * the message so rather ignore the return value. |
2838 | */ |
2839 | pfkey_broadcast(skb: skb_clone(skb, GFP_KERNEL), GFP_KERNEL, |
2840 | BROADCAST_PROMISC_ONLY, NULL, net: sock_net(sk)); |
2841 | |
2842 | memset(ext_hdrs, 0, sizeof(ext_hdrs)); |
2843 | err = parse_exthdrs(skb, hdr, ext_hdrs); |
2844 | if (!err) { |
2845 | err = -EOPNOTSUPP; |
2846 | if (pfkey_funcs[hdr->sadb_msg_type]) |
2847 | err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs); |
2848 | } |
2849 | return err; |
2850 | } |
2851 | |
2852 | static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp) |
2853 | { |
2854 | struct sadb_msg *hdr = NULL; |
2855 | |
2856 | if (skb->len < sizeof(*hdr)) { |
2857 | *errp = -EMSGSIZE; |
2858 | } else { |
2859 | hdr = (struct sadb_msg *) skb->data; |
2860 | if (hdr->sadb_msg_version != PF_KEY_V2 || |
2861 | hdr->sadb_msg_reserved != 0 || |
2862 | (hdr->sadb_msg_type <= SADB_RESERVED || |
2863 | hdr->sadb_msg_type > SADB_MAX)) { |
2864 | hdr = NULL; |
2865 | *errp = -EINVAL; |
2866 | } else if (hdr->sadb_msg_len != (skb->len / |
2867 | sizeof(uint64_t)) || |
2868 | hdr->sadb_msg_len < (sizeof(struct sadb_msg) / |
2869 | sizeof(uint64_t))) { |
2870 | hdr = NULL; |
2871 | *errp = -EMSGSIZE; |
2872 | } else { |
2873 | *errp = 0; |
2874 | } |
2875 | } |
2876 | return hdr; |
2877 | } |
2878 | |
2879 | static inline int aalg_tmpl_set(const struct xfrm_tmpl *t, |
2880 | const struct xfrm_algo_desc *d) |
2881 | { |
2882 | unsigned int id = d->desc.sadb_alg_id; |
2883 | |
2884 | if (id >= sizeof(t->aalgos) * 8) |
2885 | return 0; |
2886 | |
2887 | return (t->aalgos >> id) & 1; |
2888 | } |
2889 | |
2890 | static inline int ealg_tmpl_set(const struct xfrm_tmpl *t, |
2891 | const struct xfrm_algo_desc *d) |
2892 | { |
2893 | unsigned int id = d->desc.sadb_alg_id; |
2894 | |
2895 | if (id >= sizeof(t->ealgos) * 8) |
2896 | return 0; |
2897 | |
2898 | return (t->ealgos >> id) & 1; |
2899 | } |
2900 | |
2901 | static int count_ah_combs(const struct xfrm_tmpl *t) |
2902 | { |
2903 | int i, sz = 0; |
2904 | |
2905 | for (i = 0; ; i++) { |
2906 | const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(idx: i); |
2907 | if (!aalg) |
2908 | break; |
2909 | if (!aalg->pfkey_supported) |
2910 | continue; |
2911 | if (aalg_tmpl_set(t, d: aalg)) |
2912 | sz += sizeof(struct sadb_comb); |
2913 | } |
2914 | return sz + sizeof(struct sadb_prop); |
2915 | } |
2916 | |
2917 | static int count_esp_combs(const struct xfrm_tmpl *t) |
2918 | { |
2919 | int i, k, sz = 0; |
2920 | |
2921 | for (i = 0; ; i++) { |
2922 | const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(idx: i); |
2923 | if (!ealg) |
2924 | break; |
2925 | |
2926 | if (!ealg->pfkey_supported) |
2927 | continue; |
2928 | |
2929 | if (!(ealg_tmpl_set(t, d: ealg))) |
2930 | continue; |
2931 | |
2932 | for (k = 1; ; k++) { |
2933 | const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(idx: k); |
2934 | if (!aalg) |
2935 | break; |
2936 | |
2937 | if (!aalg->pfkey_supported) |
2938 | continue; |
2939 | |
2940 | if (aalg_tmpl_set(t, d: aalg)) |
2941 | sz += sizeof(struct sadb_comb); |
2942 | } |
2943 | } |
2944 | return sz + sizeof(struct sadb_prop); |
2945 | } |
2946 | |
2947 | static int dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t) |
2948 | { |
2949 | struct sadb_prop *p; |
2950 | int sz = 0; |
2951 | int i; |
2952 | |
2953 | p = skb_put(skb, len: sizeof(struct sadb_prop)); |
2954 | p->sadb_prop_len = sizeof(struct sadb_prop)/8; |
2955 | p->sadb_prop_exttype = SADB_EXT_PROPOSAL; |
2956 | p->sadb_prop_replay = 32; |
2957 | memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved)); |
2958 | |
2959 | for (i = 0; ; i++) { |
2960 | const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(idx: i); |
2961 | if (!aalg) |
2962 | break; |
2963 | |
2964 | if (!aalg->pfkey_supported) |
2965 | continue; |
2966 | |
2967 | if (aalg_tmpl_set(t, d: aalg) && aalg->available) { |
2968 | struct sadb_comb *c; |
2969 | c = skb_put_zero(skb, len: sizeof(struct sadb_comb)); |
2970 | p->sadb_prop_len += sizeof(struct sadb_comb)/8; |
2971 | c->sadb_comb_auth = aalg->desc.sadb_alg_id; |
2972 | c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits; |
2973 | c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits; |
2974 | c->sadb_comb_hard_addtime = 24*60*60; |
2975 | c->sadb_comb_soft_addtime = 20*60*60; |
2976 | c->sadb_comb_hard_usetime = 8*60*60; |
2977 | c->sadb_comb_soft_usetime = 7*60*60; |
2978 | sz += sizeof(*c); |
2979 | } |
2980 | } |
2981 | |
2982 | return sz + sizeof(*p); |
2983 | } |
2984 | |
2985 | static int dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t) |
2986 | { |
2987 | struct sadb_prop *p; |
2988 | int sz = 0; |
2989 | int i, k; |
2990 | |
2991 | p = skb_put(skb, len: sizeof(struct sadb_prop)); |
2992 | p->sadb_prop_len = sizeof(struct sadb_prop)/8; |
2993 | p->sadb_prop_exttype = SADB_EXT_PROPOSAL; |
2994 | p->sadb_prop_replay = 32; |
2995 | memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved)); |
2996 | |
2997 | for (i=0; ; i++) { |
2998 | const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(idx: i); |
2999 | if (!ealg) |
3000 | break; |
3001 | |
3002 | if (!ealg->pfkey_supported) |
3003 | continue; |
3004 | |
3005 | if (!(ealg_tmpl_set(t, d: ealg) && ealg->available)) |
3006 | continue; |
3007 | |
3008 | for (k = 1; ; k++) { |
3009 | struct sadb_comb *c; |
3010 | const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(idx: k); |
3011 | if (!aalg) |
3012 | break; |
3013 | if (!aalg->pfkey_supported) |
3014 | continue; |
3015 | if (!(aalg_tmpl_set(t, d: aalg) && aalg->available)) |
3016 | continue; |
3017 | c = skb_put(skb, len: sizeof(struct sadb_comb)); |
3018 | memset(c, 0, sizeof(*c)); |
3019 | p->sadb_prop_len += sizeof(struct sadb_comb)/8; |
3020 | c->sadb_comb_auth = aalg->desc.sadb_alg_id; |
3021 | c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits; |
3022 | c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits; |
3023 | c->sadb_comb_encrypt = ealg->desc.sadb_alg_id; |
3024 | c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits; |
3025 | c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits; |
3026 | c->sadb_comb_hard_addtime = 24*60*60; |
3027 | c->sadb_comb_soft_addtime = 20*60*60; |
3028 | c->sadb_comb_hard_usetime = 8*60*60; |
3029 | c->sadb_comb_soft_usetime = 7*60*60; |
3030 | sz += sizeof(*c); |
3031 | } |
3032 | } |
3033 | |
3034 | return sz + sizeof(*p); |
3035 | } |
3036 | |
3037 | static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c) |
3038 | { |
3039 | return 0; |
3040 | } |
3041 | |
3042 | static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c) |
3043 | { |
3044 | struct sk_buff *out_skb; |
3045 | struct sadb_msg *out_hdr; |
3046 | int hard; |
3047 | int hsc; |
3048 | |
3049 | hard = c->data.hard; |
3050 | if (hard) |
3051 | hsc = 2; |
3052 | else |
3053 | hsc = 1; |
3054 | |
3055 | out_skb = pfkey_xfrm_state2msg_expire(x, hsc); |
3056 | if (IS_ERR(ptr: out_skb)) |
3057 | return PTR_ERR(ptr: out_skb); |
3058 | |
3059 | out_hdr = (struct sadb_msg *) out_skb->data; |
3060 | out_hdr->sadb_msg_version = PF_KEY_V2; |
3061 | out_hdr->sadb_msg_type = SADB_EXPIRE; |
3062 | out_hdr->sadb_msg_satype = pfkey_proto2satype(proto: x->id.proto); |
3063 | out_hdr->sadb_msg_errno = 0; |
3064 | out_hdr->sadb_msg_reserved = 0; |
3065 | out_hdr->sadb_msg_seq = 0; |
3066 | out_hdr->sadb_msg_pid = 0; |
3067 | |
3068 | pfkey_broadcast(skb: out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, |
3069 | net: xs_net(x)); |
3070 | return 0; |
3071 | } |
3072 | |
3073 | static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c) |
3074 | { |
3075 | struct net *net = x ? xs_net(x) : c->net; |
3076 | struct netns_pfkey *net_pfkey = net_generic(net, id: pfkey_net_id); |
3077 | |
3078 | if (atomic_read(v: &net_pfkey->socks_nr) == 0) |
3079 | return 0; |
3080 | |
3081 | switch (c->event) { |
3082 | case XFRM_MSG_EXPIRE: |
3083 | return key_notify_sa_expire(x, c); |
3084 | case XFRM_MSG_DELSA: |
3085 | case XFRM_MSG_NEWSA: |
3086 | case XFRM_MSG_UPDSA: |
3087 | return key_notify_sa(x, c); |
3088 | case XFRM_MSG_FLUSHSA: |
3089 | return key_notify_sa_flush(c); |
3090 | case XFRM_MSG_NEWAE: /* not yet supported */ |
3091 | break; |
3092 | default: |
3093 | pr_err("pfkey: Unknown SA event %d\n" , c->event); |
3094 | break; |
3095 | } |
3096 | |
3097 | return 0; |
3098 | } |
3099 | |
3100 | static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) |
3101 | { |
3102 | if (xp && xp->type != XFRM_POLICY_TYPE_MAIN) |
3103 | return 0; |
3104 | |
3105 | switch (c->event) { |
3106 | case XFRM_MSG_POLEXPIRE: |
3107 | return key_notify_policy_expire(xp, c); |
3108 | case XFRM_MSG_DELPOLICY: |
3109 | case XFRM_MSG_NEWPOLICY: |
3110 | case XFRM_MSG_UPDPOLICY: |
3111 | return key_notify_policy(xp, dir, c); |
3112 | case XFRM_MSG_FLUSHPOLICY: |
3113 | if (c->data.type != XFRM_POLICY_TYPE_MAIN) |
3114 | break; |
3115 | return key_notify_policy_flush(c); |
3116 | default: |
3117 | pr_err("pfkey: Unknown policy event %d\n" , c->event); |
3118 | break; |
3119 | } |
3120 | |
3121 | return 0; |
3122 | } |
3123 | |
3124 | static u32 get_acqseq(void) |
3125 | { |
3126 | u32 res; |
3127 | static atomic_t acqseq; |
3128 | |
3129 | do { |
3130 | res = atomic_inc_return(v: &acqseq); |
3131 | } while (!res); |
3132 | return res; |
3133 | } |
3134 | |
3135 | static bool pfkey_is_alive(const struct km_event *c) |
3136 | { |
3137 | struct netns_pfkey *net_pfkey = net_generic(net: c->net, id: pfkey_net_id); |
3138 | struct sock *sk; |
3139 | bool is_alive = false; |
3140 | |
3141 | rcu_read_lock(); |
3142 | sk_for_each_rcu(sk, &net_pfkey->table) { |
3143 | if (pfkey_sk(sk)->registered) { |
3144 | is_alive = true; |
3145 | break; |
3146 | } |
3147 | } |
3148 | rcu_read_unlock(); |
3149 | |
3150 | return is_alive; |
3151 | } |
3152 | |
3153 | static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp) |
3154 | { |
3155 | struct sk_buff *skb; |
3156 | struct sadb_msg *hdr; |
3157 | struct sadb_address *addr; |
3158 | struct sadb_x_policy *pol; |
3159 | int sockaddr_size; |
3160 | int size; |
3161 | struct sadb_x_sec_ctx *sec_ctx; |
3162 | struct xfrm_sec_ctx *xfrm_ctx; |
3163 | int ctx_size = 0; |
3164 | int alg_size = 0; |
3165 | |
3166 | sockaddr_size = pfkey_sockaddr_size(family: x->props.family); |
3167 | if (!sockaddr_size) |
3168 | return -EINVAL; |
3169 | |
3170 | size = sizeof(struct sadb_msg) + |
3171 | (sizeof(struct sadb_address) * 2) + |
3172 | (sockaddr_size * 2) + |
3173 | sizeof(struct sadb_x_policy); |
3174 | |
3175 | if (x->id.proto == IPPROTO_AH) |
3176 | alg_size = count_ah_combs(t); |
3177 | else if (x->id.proto == IPPROTO_ESP) |
3178 | alg_size = count_esp_combs(t); |
3179 | |
3180 | if ((xfrm_ctx = x->security)) { |
3181 | ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len); |
3182 | size += sizeof(struct sadb_x_sec_ctx) + ctx_size; |
3183 | } |
3184 | |
3185 | skb = alloc_skb(size: size + alg_size + 16, GFP_ATOMIC); |
3186 | if (skb == NULL) |
3187 | return -ENOMEM; |
3188 | |
3189 | hdr = skb_put(skb, len: sizeof(struct sadb_msg)); |
3190 | hdr->sadb_msg_version = PF_KEY_V2; |
3191 | hdr->sadb_msg_type = SADB_ACQUIRE; |
3192 | hdr->sadb_msg_satype = pfkey_proto2satype(proto: x->id.proto); |
3193 | hdr->sadb_msg_len = size / sizeof(uint64_t); |
3194 | hdr->sadb_msg_errno = 0; |
3195 | hdr->sadb_msg_reserved = 0; |
3196 | hdr->sadb_msg_seq = x->km.seq = get_acqseq(); |
3197 | hdr->sadb_msg_pid = 0; |
3198 | |
3199 | /* src address */ |
3200 | addr = skb_put(skb, len: sizeof(struct sadb_address) + sockaddr_size); |
3201 | addr->sadb_address_len = |
3202 | (sizeof(struct sadb_address)+sockaddr_size)/ |
3203 | sizeof(uint64_t); |
3204 | addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; |
3205 | addr->sadb_address_proto = 0; |
3206 | addr->sadb_address_reserved = 0; |
3207 | addr->sadb_address_prefixlen = |
3208 | pfkey_sockaddr_fill(xaddr: &x->props.saddr, port: 0, |
3209 | sa: (struct sockaddr *) (addr + 1), |
3210 | family: x->props.family); |
3211 | if (!addr->sadb_address_prefixlen) |
3212 | BUG(); |
3213 | |
3214 | /* dst address */ |
3215 | addr = skb_put(skb, len: sizeof(struct sadb_address) + sockaddr_size); |
3216 | addr->sadb_address_len = |
3217 | (sizeof(struct sadb_address)+sockaddr_size)/ |
3218 | sizeof(uint64_t); |
3219 | addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; |
3220 | addr->sadb_address_proto = 0; |
3221 | addr->sadb_address_reserved = 0; |
3222 | addr->sadb_address_prefixlen = |
3223 | pfkey_sockaddr_fill(xaddr: &x->id.daddr, port: 0, |
3224 | sa: (struct sockaddr *) (addr + 1), |
3225 | family: x->props.family); |
3226 | if (!addr->sadb_address_prefixlen) |
3227 | BUG(); |
3228 | |
3229 | pol = skb_put(skb, len: sizeof(struct sadb_x_policy)); |
3230 | pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t); |
3231 | pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; |
3232 | pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; |
3233 | pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1; |
3234 | pol->sadb_x_policy_reserved = 0; |
3235 | pol->sadb_x_policy_id = xp->index; |
3236 | pol->sadb_x_policy_priority = xp->priority; |
3237 | |
3238 | /* Set sadb_comb's. */ |
3239 | alg_size = 0; |
3240 | if (x->id.proto == IPPROTO_AH) |
3241 | alg_size = dump_ah_combs(skb, t); |
3242 | else if (x->id.proto == IPPROTO_ESP) |
3243 | alg_size = dump_esp_combs(skb, t); |
3244 | |
3245 | hdr->sadb_msg_len += alg_size / 8; |
3246 | |
3247 | /* security context */ |
3248 | if (xfrm_ctx) { |
3249 | sec_ctx = skb_put(skb, |
3250 | len: sizeof(struct sadb_x_sec_ctx) + ctx_size); |
3251 | sec_ctx->sadb_x_sec_len = |
3252 | (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t); |
3253 | sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX; |
3254 | sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi; |
3255 | sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg; |
3256 | sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len; |
3257 | memcpy(sec_ctx + 1, xfrm_ctx->ctx_str, |
3258 | xfrm_ctx->ctx_len); |
3259 | } |
3260 | |
3261 | return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, |
3262 | net: xs_net(x)); |
3263 | } |
3264 | |
3265 | static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt, |
3266 | u8 *data, int len, int *dir) |
3267 | { |
3268 | struct net *net = sock_net(sk); |
3269 | struct xfrm_policy *xp; |
3270 | struct sadb_x_policy *pol = (struct sadb_x_policy*)data; |
3271 | struct sadb_x_sec_ctx *sec_ctx; |
3272 | |
3273 | switch (sk->sk_family) { |
3274 | case AF_INET: |
3275 | if (opt != IP_IPSEC_POLICY) { |
3276 | *dir = -EOPNOTSUPP; |
3277 | return NULL; |
3278 | } |
3279 | break; |
3280 | #if IS_ENABLED(CONFIG_IPV6) |
3281 | case AF_INET6: |
3282 | if (opt != IPV6_IPSEC_POLICY) { |
3283 | *dir = -EOPNOTSUPP; |
3284 | return NULL; |
3285 | } |
3286 | break; |
3287 | #endif |
3288 | default: |
3289 | *dir = -EINVAL; |
3290 | return NULL; |
3291 | } |
3292 | |
3293 | *dir = -EINVAL; |
3294 | |
3295 | if (len < sizeof(struct sadb_x_policy) || |
3296 | pol->sadb_x_policy_len*8 > len || |
3297 | pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS || |
3298 | (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND)) |
3299 | return NULL; |
3300 | |
3301 | xp = xfrm_policy_alloc(net, GFP_ATOMIC); |
3302 | if (xp == NULL) { |
3303 | *dir = -ENOBUFS; |
3304 | return NULL; |
3305 | } |
3306 | |
3307 | xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ? |
3308 | XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW); |
3309 | |
3310 | xp->lft.soft_byte_limit = XFRM_INF; |
3311 | xp->lft.hard_byte_limit = XFRM_INF; |
3312 | xp->lft.soft_packet_limit = XFRM_INF; |
3313 | xp->lft.hard_packet_limit = XFRM_INF; |
3314 | xp->family = sk->sk_family; |
3315 | |
3316 | xp->xfrm_nr = 0; |
3317 | if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC && |
3318 | (*dir = parse_ipsecrequests(xp, pol)) < 0) |
3319 | goto out; |
3320 | |
3321 | /* security context too */ |
3322 | if (len >= (pol->sadb_x_policy_len*8 + |
3323 | sizeof(struct sadb_x_sec_ctx))) { |
3324 | char *p = (char *)pol; |
3325 | struct xfrm_user_sec_ctx *uctx; |
3326 | |
3327 | p += pol->sadb_x_policy_len*8; |
3328 | sec_ctx = (struct sadb_x_sec_ctx *)p; |
3329 | if (len < pol->sadb_x_policy_len*8 + |
3330 | sec_ctx->sadb_x_sec_len*8) { |
3331 | *dir = -EINVAL; |
3332 | goto out; |
3333 | } |
3334 | if ((*dir = verify_sec_ctx_len(p))) |
3335 | goto out; |
3336 | uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_ATOMIC); |
3337 | *dir = security_xfrm_policy_alloc(ctxp: &xp->security, sec_ctx: uctx, GFP_ATOMIC); |
3338 | kfree(objp: uctx); |
3339 | |
3340 | if (*dir) |
3341 | goto out; |
3342 | } |
3343 | |
3344 | *dir = pol->sadb_x_policy_dir-1; |
3345 | return xp; |
3346 | |
3347 | out: |
3348 | xp->walk.dead = 1; |
3349 | xfrm_policy_destroy(policy: xp); |
3350 | return NULL; |
3351 | } |
3352 | |
3353 | static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport) |
3354 | { |
3355 | struct sk_buff *skb; |
3356 | struct sadb_msg *hdr; |
3357 | struct sadb_sa *sa; |
3358 | struct sadb_address *addr; |
3359 | struct sadb_x_nat_t_port *n_port; |
3360 | int sockaddr_size; |
3361 | int size; |
3362 | __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0); |
3363 | struct xfrm_encap_tmpl *natt = NULL; |
3364 | |
3365 | sockaddr_size = pfkey_sockaddr_size(family: x->props.family); |
3366 | if (!sockaddr_size) |
3367 | return -EINVAL; |
3368 | |
3369 | if (!satype) |
3370 | return -EINVAL; |
3371 | |
3372 | if (!x->encap) |
3373 | return -EINVAL; |
3374 | |
3375 | natt = x->encap; |
3376 | |
3377 | /* Build an SADB_X_NAT_T_NEW_MAPPING message: |
3378 | * |
3379 | * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) | |
3380 | * ADDRESS_DST (new addr) | NAT_T_DPORT (new port) |
3381 | */ |
3382 | |
3383 | size = sizeof(struct sadb_msg) + |
3384 | sizeof(struct sadb_sa) + |
3385 | (sizeof(struct sadb_address) * 2) + |
3386 | (sockaddr_size * 2) + |
3387 | (sizeof(struct sadb_x_nat_t_port) * 2); |
3388 | |
3389 | skb = alloc_skb(size: size + 16, GFP_ATOMIC); |
3390 | if (skb == NULL) |
3391 | return -ENOMEM; |
3392 | |
3393 | hdr = skb_put(skb, len: sizeof(struct sadb_msg)); |
3394 | hdr->sadb_msg_version = PF_KEY_V2; |
3395 | hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING; |
3396 | hdr->sadb_msg_satype = satype; |
3397 | hdr->sadb_msg_len = size / sizeof(uint64_t); |
3398 | hdr->sadb_msg_errno = 0; |
3399 | hdr->sadb_msg_reserved = 0; |
3400 | hdr->sadb_msg_seq = x->km.seq; |
3401 | hdr->sadb_msg_pid = 0; |
3402 | |
3403 | /* SA */ |
3404 | sa = skb_put(skb, len: sizeof(struct sadb_sa)); |
3405 | sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t); |
3406 | sa->sadb_sa_exttype = SADB_EXT_SA; |
3407 | sa->sadb_sa_spi = x->id.spi; |
3408 | sa->sadb_sa_replay = 0; |
3409 | sa->sadb_sa_state = 0; |
3410 | sa->sadb_sa_auth = 0; |
3411 | sa->sadb_sa_encrypt = 0; |
3412 | sa->sadb_sa_flags = 0; |
3413 | |
3414 | /* ADDRESS_SRC (old addr) */ |
3415 | addr = skb_put(skb, len: sizeof(struct sadb_address) + sockaddr_size); |
3416 | addr->sadb_address_len = |
3417 | (sizeof(struct sadb_address)+sockaddr_size)/ |
3418 | sizeof(uint64_t); |
3419 | addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; |
3420 | addr->sadb_address_proto = 0; |
3421 | addr->sadb_address_reserved = 0; |
3422 | addr->sadb_address_prefixlen = |
3423 | pfkey_sockaddr_fill(xaddr: &x->props.saddr, port: 0, |
3424 | sa: (struct sockaddr *) (addr + 1), |
3425 | family: x->props.family); |
3426 | if (!addr->sadb_address_prefixlen) |
3427 | BUG(); |
3428 | |
3429 | /* NAT_T_SPORT (old port) */ |
3430 | n_port = skb_put(skb, len: sizeof(*n_port)); |
3431 | n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); |
3432 | n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT; |
3433 | n_port->sadb_x_nat_t_port_port = natt->encap_sport; |
3434 | n_port->sadb_x_nat_t_port_reserved = 0; |
3435 | |
3436 | /* ADDRESS_DST (new addr) */ |
3437 | addr = skb_put(skb, len: sizeof(struct sadb_address) + sockaddr_size); |
3438 | addr->sadb_address_len = |
3439 | (sizeof(struct sadb_address)+sockaddr_size)/ |
3440 | sizeof(uint64_t); |
3441 | addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; |
3442 | addr->sadb_address_proto = 0; |
3443 | addr->sadb_address_reserved = 0; |
3444 | addr->sadb_address_prefixlen = |
3445 | pfkey_sockaddr_fill(xaddr: ipaddr, port: 0, |
3446 | sa: (struct sockaddr *) (addr + 1), |
3447 | family: x->props.family); |
3448 | if (!addr->sadb_address_prefixlen) |
3449 | BUG(); |
3450 | |
3451 | /* NAT_T_DPORT (new port) */ |
3452 | n_port = skb_put(skb, len: sizeof(*n_port)); |
3453 | n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); |
3454 | n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT; |
3455 | n_port->sadb_x_nat_t_port_port = sport; |
3456 | n_port->sadb_x_nat_t_port_reserved = 0; |
3457 | |
3458 | return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, |
3459 | net: xs_net(x)); |
3460 | } |
3461 | |
3462 | #ifdef CONFIG_NET_KEY_MIGRATE |
3463 | static int set_sadb_address(struct sk_buff *skb, int sasize, int type, |
3464 | const struct xfrm_selector *sel) |
3465 | { |
3466 | struct sadb_address *addr; |
3467 | addr = skb_put(skb, len: sizeof(struct sadb_address) + sasize); |
3468 | addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8; |
3469 | addr->sadb_address_exttype = type; |
3470 | addr->sadb_address_proto = sel->proto; |
3471 | addr->sadb_address_reserved = 0; |
3472 | |
3473 | switch (type) { |
3474 | case SADB_EXT_ADDRESS_SRC: |
3475 | addr->sadb_address_prefixlen = sel->prefixlen_s; |
3476 | pfkey_sockaddr_fill(xaddr: &sel->saddr, port: 0, |
3477 | sa: (struct sockaddr *)(addr + 1), |
3478 | family: sel->family); |
3479 | break; |
3480 | case SADB_EXT_ADDRESS_DST: |
3481 | addr->sadb_address_prefixlen = sel->prefixlen_d; |
3482 | pfkey_sockaddr_fill(xaddr: &sel->daddr, port: 0, |
3483 | sa: (struct sockaddr *)(addr + 1), |
3484 | family: sel->family); |
3485 | break; |
3486 | default: |
3487 | return -EINVAL; |
3488 | } |
3489 | |
3490 | return 0; |
3491 | } |
3492 | |
3493 | |
3494 | static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k) |
3495 | { |
3496 | struct sadb_x_kmaddress *kma; |
3497 | u8 *sa; |
3498 | int family = k->family; |
3499 | int socklen = pfkey_sockaddr_len(family); |
3500 | int size_req; |
3501 | |
3502 | size_req = (sizeof(struct sadb_x_kmaddress) + |
3503 | pfkey_sockaddr_pair_size(family)); |
3504 | |
3505 | kma = skb_put_zero(skb, len: size_req); |
3506 | kma->sadb_x_kmaddress_len = size_req / 8; |
3507 | kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS; |
3508 | kma->sadb_x_kmaddress_reserved = k->reserved; |
3509 | |
3510 | sa = (u8 *)(kma + 1); |
3511 | if (!pfkey_sockaddr_fill(xaddr: &k->local, port: 0, sa: (struct sockaddr *)sa, family) || |
3512 | !pfkey_sockaddr_fill(xaddr: &k->remote, port: 0, sa: (struct sockaddr *)(sa+socklen), family)) |
3513 | return -EINVAL; |
3514 | |
3515 | return 0; |
3516 | } |
3517 | |
3518 | static int set_ipsecrequest(struct sk_buff *skb, |
3519 | uint8_t proto, uint8_t mode, int level, |
3520 | uint32_t reqid, uint8_t family, |
3521 | const xfrm_address_t *src, const xfrm_address_t *dst) |
3522 | { |
3523 | struct sadb_x_ipsecrequest *rq; |
3524 | u8 *sa; |
3525 | int socklen = pfkey_sockaddr_len(family); |
3526 | int size_req; |
3527 | |
3528 | size_req = sizeof(struct sadb_x_ipsecrequest) + |
3529 | pfkey_sockaddr_pair_size(family); |
3530 | |
3531 | rq = skb_put_zero(skb, len: size_req); |
3532 | rq->sadb_x_ipsecrequest_len = size_req; |
3533 | rq->sadb_x_ipsecrequest_proto = proto; |
3534 | rq->sadb_x_ipsecrequest_mode = mode; |
3535 | rq->sadb_x_ipsecrequest_level = level; |
3536 | rq->sadb_x_ipsecrequest_reqid = reqid; |
3537 | |
3538 | sa = (u8 *) (rq + 1); |
3539 | if (!pfkey_sockaddr_fill(xaddr: src, port: 0, sa: (struct sockaddr *)sa, family) || |
3540 | !pfkey_sockaddr_fill(xaddr: dst, port: 0, sa: (struct sockaddr *)(sa + socklen), family)) |
3541 | return -EINVAL; |
3542 | |
3543 | return 0; |
3544 | } |
3545 | #endif |
3546 | |
3547 | #ifdef CONFIG_NET_KEY_MIGRATE |
3548 | static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, |
3549 | const struct xfrm_migrate *m, int num_bundles, |
3550 | const struct xfrm_kmaddress *k, |
3551 | const struct xfrm_encap_tmpl *encap) |
3552 | { |
3553 | int i; |
3554 | int sasize_sel; |
3555 | int size = 0; |
3556 | int size_pol = 0; |
3557 | struct sk_buff *skb; |
3558 | struct sadb_msg *hdr; |
3559 | struct sadb_x_policy *pol; |
3560 | const struct xfrm_migrate *mp; |
3561 | |
3562 | if (type != XFRM_POLICY_TYPE_MAIN) |
3563 | return 0; |
3564 | |
3565 | if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH) |
3566 | return -EINVAL; |
3567 | |
3568 | if (k != NULL) { |
3569 | /* addresses for KM */ |
3570 | size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) + |
3571 | pfkey_sockaddr_pair_size(k->family)); |
3572 | } |
3573 | |
3574 | /* selector */ |
3575 | sasize_sel = pfkey_sockaddr_size(family: sel->family); |
3576 | if (!sasize_sel) |
3577 | return -EINVAL; |
3578 | size += (sizeof(struct sadb_address) + sasize_sel) * 2; |
3579 | |
3580 | /* policy info */ |
3581 | size_pol += sizeof(struct sadb_x_policy); |
3582 | |
3583 | /* ipsecrequests */ |
3584 | for (i = 0, mp = m; i < num_bundles; i++, mp++) { |
3585 | /* old locator pair */ |
3586 | size_pol += sizeof(struct sadb_x_ipsecrequest) + |
3587 | pfkey_sockaddr_pair_size(family: mp->old_family); |
3588 | /* new locator pair */ |
3589 | size_pol += sizeof(struct sadb_x_ipsecrequest) + |
3590 | pfkey_sockaddr_pair_size(family: mp->new_family); |
3591 | } |
3592 | |
3593 | size += sizeof(struct sadb_msg) + size_pol; |
3594 | |
3595 | /* alloc buffer */ |
3596 | skb = alloc_skb(size, GFP_ATOMIC); |
3597 | if (skb == NULL) |
3598 | return -ENOMEM; |
3599 | |
3600 | hdr = skb_put(skb, len: sizeof(struct sadb_msg)); |
3601 | hdr->sadb_msg_version = PF_KEY_V2; |
3602 | hdr->sadb_msg_type = SADB_X_MIGRATE; |
3603 | hdr->sadb_msg_satype = pfkey_proto2satype(proto: m->proto); |
3604 | hdr->sadb_msg_len = size / 8; |
3605 | hdr->sadb_msg_errno = 0; |
3606 | hdr->sadb_msg_reserved = 0; |
3607 | hdr->sadb_msg_seq = 0; |
3608 | hdr->sadb_msg_pid = 0; |
3609 | |
3610 | /* Addresses to be used by KM for negotiation, if ext is available */ |
3611 | if (k != NULL && (set_sadb_kmaddress(skb, k) < 0)) |
3612 | goto err; |
3613 | |
3614 | /* selector src */ |
3615 | set_sadb_address(skb, sasize: sasize_sel, SADB_EXT_ADDRESS_SRC, sel); |
3616 | |
3617 | /* selector dst */ |
3618 | set_sadb_address(skb, sasize: sasize_sel, SADB_EXT_ADDRESS_DST, sel); |
3619 | |
3620 | /* policy information */ |
3621 | pol = skb_put(skb, len: sizeof(struct sadb_x_policy)); |
3622 | pol->sadb_x_policy_len = size_pol / 8; |
3623 | pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; |
3624 | pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; |
3625 | pol->sadb_x_policy_dir = dir + 1; |
3626 | pol->sadb_x_policy_reserved = 0; |
3627 | pol->sadb_x_policy_id = 0; |
3628 | pol->sadb_x_policy_priority = 0; |
3629 | |
3630 | for (i = 0, mp = m; i < num_bundles; i++, mp++) { |
3631 | /* old ipsecrequest */ |
3632 | int mode = pfkey_mode_from_xfrm(mode: mp->mode); |
3633 | if (mode < 0) |
3634 | goto err; |
3635 | if (set_ipsecrequest(skb, proto: mp->proto, mode, |
3636 | level: (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE), |
3637 | reqid: mp->reqid, family: mp->old_family, |
3638 | src: &mp->old_saddr, dst: &mp->old_daddr) < 0) |
3639 | goto err; |
3640 | |
3641 | /* new ipsecrequest */ |
3642 | if (set_ipsecrequest(skb, proto: mp->proto, mode, |
3643 | level: (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE), |
3644 | reqid: mp->reqid, family: mp->new_family, |
3645 | src: &mp->new_saddr, dst: &mp->new_daddr) < 0) |
3646 | goto err; |
3647 | } |
3648 | |
3649 | /* broadcast migrate message to sockets */ |
3650 | pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, net: &init_net); |
3651 | |
3652 | return 0; |
3653 | |
3654 | err: |
3655 | kfree_skb(skb); |
3656 | return -EINVAL; |
3657 | } |
3658 | #else |
3659 | static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, |
3660 | const struct xfrm_migrate *m, int num_bundles, |
3661 | const struct xfrm_kmaddress *k, |
3662 | const struct xfrm_encap_tmpl *encap) |
3663 | { |
3664 | return -ENOPROTOOPT; |
3665 | } |
3666 | #endif |
3667 | |
3668 | static int pfkey_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) |
3669 | { |
3670 | struct sock *sk = sock->sk; |
3671 | struct sk_buff *skb = NULL; |
3672 | struct sadb_msg *hdr = NULL; |
3673 | int err; |
3674 | struct net *net = sock_net(sk); |
3675 | |
3676 | err = -EOPNOTSUPP; |
3677 | if (msg->msg_flags & MSG_OOB) |
3678 | goto out; |
3679 | |
3680 | err = -EMSGSIZE; |
3681 | if ((unsigned int)len > sk->sk_sndbuf - 32) |
3682 | goto out; |
3683 | |
3684 | err = -ENOBUFS; |
3685 | skb = alloc_skb(size: len, GFP_KERNEL); |
3686 | if (skb == NULL) |
3687 | goto out; |
3688 | |
3689 | err = -EFAULT; |
3690 | if (memcpy_from_msg(data: skb_put(skb,len), msg, len)) |
3691 | goto out; |
3692 | |
3693 | hdr = pfkey_get_base_msg(skb, errp: &err); |
3694 | if (!hdr) |
3695 | goto out; |
3696 | |
3697 | mutex_lock(&net->xfrm.xfrm_cfg_mutex); |
3698 | err = pfkey_process(sk, skb, hdr); |
3699 | mutex_unlock(lock: &net->xfrm.xfrm_cfg_mutex); |
3700 | |
3701 | out: |
3702 | if (err && hdr && pfkey_error(orig: hdr, err, sk) == 0) |
3703 | err = 0; |
3704 | kfree_skb(skb); |
3705 | |
3706 | return err ? : len; |
3707 | } |
3708 | |
3709 | static int pfkey_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, |
3710 | int flags) |
3711 | { |
3712 | struct sock *sk = sock->sk; |
3713 | struct pfkey_sock *pfk = pfkey_sk(sk); |
3714 | struct sk_buff *skb; |
3715 | int copied, err; |
3716 | |
3717 | err = -EINVAL; |
3718 | if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT)) |
3719 | goto out; |
3720 | |
3721 | skb = skb_recv_datagram(sk, flags, err: &err); |
3722 | if (skb == NULL) |
3723 | goto out; |
3724 | |
3725 | copied = skb->len; |
3726 | if (copied > len) { |
3727 | msg->msg_flags |= MSG_TRUNC; |
3728 | copied = len; |
3729 | } |
3730 | |
3731 | skb_reset_transport_header(skb); |
3732 | err = skb_copy_datagram_msg(from: skb, offset: 0, msg, size: copied); |
3733 | if (err) |
3734 | goto out_free; |
3735 | |
3736 | sock_recv_cmsgs(msg, sk, skb); |
3737 | |
3738 | err = (flags & MSG_TRUNC) ? skb->len : copied; |
3739 | |
3740 | if (pfk->dump.dump != NULL && |
3741 | 3 * atomic_read(v: &sk->sk_rmem_alloc) <= sk->sk_rcvbuf) |
3742 | pfkey_do_dump(pfk); |
3743 | |
3744 | out_free: |
3745 | skb_free_datagram(sk, skb); |
3746 | out: |
3747 | return err; |
3748 | } |
3749 | |
3750 | static const struct proto_ops pfkey_ops = { |
3751 | .family = PF_KEY, |
3752 | .owner = THIS_MODULE, |
3753 | /* Operations that make no sense on pfkey sockets. */ |
3754 | .bind = sock_no_bind, |
3755 | .connect = sock_no_connect, |
3756 | .socketpair = sock_no_socketpair, |
3757 | .accept = sock_no_accept, |
3758 | .getname = sock_no_getname, |
3759 | .ioctl = sock_no_ioctl, |
3760 | .listen = sock_no_listen, |
3761 | .shutdown = sock_no_shutdown, |
3762 | .mmap = sock_no_mmap, |
3763 | |
3764 | /* Now the operations that really occur. */ |
3765 | .release = pfkey_release, |
3766 | .poll = datagram_poll, |
3767 | .sendmsg = pfkey_sendmsg, |
3768 | .recvmsg = pfkey_recvmsg, |
3769 | }; |
3770 | |
3771 | static const struct net_proto_family pfkey_family_ops = { |
3772 | .family = PF_KEY, |
3773 | .create = pfkey_create, |
3774 | .owner = THIS_MODULE, |
3775 | }; |
3776 | |
3777 | #ifdef CONFIG_PROC_FS |
3778 | static int pfkey_seq_show(struct seq_file *f, void *v) |
3779 | { |
3780 | struct sock *s = sk_entry(node: v); |
3781 | |
3782 | if (v == SEQ_START_TOKEN) |
3783 | seq_printf(m: f ,fmt: "sk RefCnt Rmem Wmem User Inode\n" ); |
3784 | else |
3785 | seq_printf(m: f, fmt: "%pK %-6d %-6u %-6u %-6u %-6lu\n" , |
3786 | s, |
3787 | refcount_read(r: &s->sk_refcnt), |
3788 | sk_rmem_alloc_get(sk: s), |
3789 | sk_wmem_alloc_get(sk: s), |
3790 | from_kuid_munged(to: seq_user_ns(seq: f), uid: sock_i_uid(sk: s)), |
3791 | sock_i_ino(sk: s) |
3792 | ); |
3793 | return 0; |
3794 | } |
3795 | |
3796 | static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos) |
3797 | __acquires(rcu) |
3798 | { |
3799 | struct net *net = seq_file_net(seq: f); |
3800 | struct netns_pfkey *net_pfkey = net_generic(net, id: pfkey_net_id); |
3801 | |
3802 | rcu_read_lock(); |
3803 | return seq_hlist_start_head_rcu(head: &net_pfkey->table, pos: *ppos); |
3804 | } |
3805 | |
3806 | static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos) |
3807 | { |
3808 | struct net *net = seq_file_net(seq: f); |
3809 | struct netns_pfkey *net_pfkey = net_generic(net, id: pfkey_net_id); |
3810 | |
3811 | return seq_hlist_next_rcu(v, head: &net_pfkey->table, ppos); |
3812 | } |
3813 | |
3814 | static void pfkey_seq_stop(struct seq_file *f, void *v) |
3815 | __releases(rcu) |
3816 | { |
3817 | rcu_read_unlock(); |
3818 | } |
3819 | |
3820 | static const struct seq_operations pfkey_seq_ops = { |
3821 | .start = pfkey_seq_start, |
3822 | .next = pfkey_seq_next, |
3823 | .stop = pfkey_seq_stop, |
3824 | .show = pfkey_seq_show, |
3825 | }; |
3826 | |
3827 | static int __net_init pfkey_init_proc(struct net *net) |
3828 | { |
3829 | struct proc_dir_entry *e; |
3830 | |
3831 | e = proc_create_net("pfkey" , 0, net->proc_net, &pfkey_seq_ops, |
3832 | sizeof(struct seq_net_private)); |
3833 | if (e == NULL) |
3834 | return -ENOMEM; |
3835 | |
3836 | return 0; |
3837 | } |
3838 | |
3839 | static void __net_exit pfkey_exit_proc(struct net *net) |
3840 | { |
3841 | remove_proc_entry("pfkey" , net->proc_net); |
3842 | } |
3843 | #else |
3844 | static inline int pfkey_init_proc(struct net *net) |
3845 | { |
3846 | return 0; |
3847 | } |
3848 | |
3849 | static inline void pfkey_exit_proc(struct net *net) |
3850 | { |
3851 | } |
3852 | #endif |
3853 | |
3854 | static struct xfrm_mgr pfkeyv2_mgr = |
3855 | { |
3856 | .notify = pfkey_send_notify, |
3857 | .acquire = pfkey_send_acquire, |
3858 | .compile_policy = pfkey_compile_policy, |
3859 | .new_mapping = pfkey_send_new_mapping, |
3860 | .notify_policy = pfkey_send_policy_notify, |
3861 | .migrate = pfkey_send_migrate, |
3862 | .is_alive = pfkey_is_alive, |
3863 | }; |
3864 | |
3865 | static int __net_init pfkey_net_init(struct net *net) |
3866 | { |
3867 | struct netns_pfkey *net_pfkey = net_generic(net, id: pfkey_net_id); |
3868 | int rv; |
3869 | |
3870 | INIT_HLIST_HEAD(&net_pfkey->table); |
3871 | atomic_set(v: &net_pfkey->socks_nr, i: 0); |
3872 | |
3873 | rv = pfkey_init_proc(net); |
3874 | |
3875 | return rv; |
3876 | } |
3877 | |
3878 | static void __net_exit pfkey_net_exit(struct net *net) |
3879 | { |
3880 | struct netns_pfkey *net_pfkey = net_generic(net, id: pfkey_net_id); |
3881 | |
3882 | pfkey_exit_proc(net); |
3883 | WARN_ON(!hlist_empty(&net_pfkey->table)); |
3884 | } |
3885 | |
3886 | static struct pernet_operations pfkey_net_ops = { |
3887 | .init = pfkey_net_init, |
3888 | .exit = pfkey_net_exit, |
3889 | .id = &pfkey_net_id, |
3890 | .size = sizeof(struct netns_pfkey), |
3891 | }; |
3892 | |
3893 | static void __exit ipsec_pfkey_exit(void) |
3894 | { |
3895 | xfrm_unregister_km(km: &pfkeyv2_mgr); |
3896 | sock_unregister(PF_KEY); |
3897 | unregister_pernet_subsys(&pfkey_net_ops); |
3898 | proto_unregister(prot: &key_proto); |
3899 | } |
3900 | |
3901 | static int __init ipsec_pfkey_init(void) |
3902 | { |
3903 | int err = proto_register(prot: &key_proto, alloc_slab: 0); |
3904 | |
3905 | if (err != 0) |
3906 | goto out; |
3907 | |
3908 | err = register_pernet_subsys(&pfkey_net_ops); |
3909 | if (err != 0) |
3910 | goto out_unregister_key_proto; |
3911 | err = sock_register(fam: &pfkey_family_ops); |
3912 | if (err != 0) |
3913 | goto out_unregister_pernet; |
3914 | xfrm_register_km(km: &pfkeyv2_mgr); |
3915 | out: |
3916 | return err; |
3917 | |
3918 | out_unregister_pernet: |
3919 | unregister_pernet_subsys(&pfkey_net_ops); |
3920 | out_unregister_key_proto: |
3921 | proto_unregister(prot: &key_proto); |
3922 | goto out; |
3923 | } |
3924 | |
3925 | module_init(ipsec_pfkey_init); |
3926 | module_exit(ipsec_pfkey_exit); |
3927 | MODULE_LICENSE("GPL" ); |
3928 | MODULE_ALIAS_NETPROTO(PF_KEY); |
3929 | |