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Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
[linux-2.6-block.git] / net / key / af_key.c
CommitLineData
2874c5fd 1// SPDX-License-Identifier: GPL-2.0-or-later
1da177e4
LT		 2/*
3 * net/key/af_key.c An implementation of PF_KEYv2 sockets.
4 *
1da177e4
LT		 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
4fc268d2 13#include <linux/capability.h>
1da177e4
LT		 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>
5a0e3ad6 25#include <linux/slab.h>
457c4cbc 26#include <net/net_namespace.h>
3fa87a32 27#include <net/netns/generic.h>
1da177e4
LT		 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
c7d03a00 35static unsigned int pfkey_net_id __read_mostly;
3fa87a32
AD		 36struct netns_pfkey {
37 /* List of all pfkey sockets. */
38 struct hlist_head table;
39 atomic_t socks_nr;
40};
7f6b9dbd 41static DEFINE_MUTEX(pfkey_mutex);
1da177e4 42
bd55775c 43#define DUMMY_MARK 0
e473fcb4 44static const struct xfrm_mark dummy_mark = {0, 0};
1da177e4
LT		 45struct pfkey_sock {
46 /* struct sock must be the first member of struct pfkey_sock */
47 struct sock sk;
48 int registered;
49 int promisc;
83321d6b
TT		 50
51 struct {
52 uint8_t msg_version;
15e47304 53 uint32_t msg_portid;
83321d6b
TT		 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;
12a169e7 60 struct sk_buff *skb;
83321d6b 61 } dump;
89e357d8 62 struct mutex dump_lock;
1da177e4
LT		 63};
64
096f41d3
HX		 65static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
66 xfrm_address_t *saddr, xfrm_address_t *daddr,
67 u16 *family);
68
1da177e4
LT		 69static inline struct pfkey_sock *pfkey_sk(struct sock *sk)
70{
71 return (struct pfkey_sock *)sk;
72}
73
4c93fbb0 74static int pfkey_can_dump(const struct sock *sk)
83321d6b
TT		 75{
76 if (3 * atomic_read(&sk->sk_rmem_alloc) <= 2 * sk->sk_rcvbuf)
77 return 1;
78 return 0;
79}
80
05238204 81static void pfkey_terminate_dump(struct pfkey_sock *pfk)
83321d6b 82{
05238204 83 if (pfk->dump.dump) {
12a169e7
HX		 84 if (pfk->dump.skb) {
85 kfree_skb(pfk->dump.skb);
86 pfk->dump.skb = NULL;
87 }
05238204
TT		 88 pfk->dump.done(pfk);
89 pfk->dump.dump = NULL;
90 pfk->dump.done = NULL;
91 }
83321d6b
TT		 92}
93
1da177e4
LT		 94static void pfkey_sock_destruct(struct sock *sk)
95{
3fa87a32
AD		 96 struct net *net = sock_net(sk);
97 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
98
05238204 99 pfkey_terminate_dump(pfkey_sk(sk));
1da177e4
LT		 100 skb_queue_purge(&sk->sk_receive_queue);
101
102 if (!sock_flag(sk, SOCK_DEAD)) {
207024b9 103 pr_err("Attempt to release alive pfkey socket: %p\n", sk);
1da177e4
LT		 104 return;
105 }
106
547b792c 107 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
14afee4b 108 WARN_ON(refcount_read(&sk->sk_wmem_alloc));
1da177e4 109
3fa87a32 110 atomic_dec(&net_pfkey->socks_nr);
1da177e4
LT		 111}
112
90ddc4f0 113static const struct proto_ops pfkey_ops;
1da177e4
LT		 114
115static void pfkey_insert(struct sock *sk)
116{
3fa87a32
AD		 117 struct net *net = sock_net(sk);
118 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
119
7f6b9dbd 120 mutex_lock(&pfkey_mutex);
121 sk_add_node_rcu(sk, &net_pfkey->table);
122 mutex_unlock(&pfkey_mutex);
1da177e4
LT		 123}
124
125static void pfkey_remove(struct sock *sk)
126{
7f6b9dbd 127 mutex_lock(&pfkey_mutex);
128 sk_del_node_init_rcu(sk);
129 mutex_unlock(&pfkey_mutex);
1da177e4
LT		 130}
131
132static struct proto key_proto = {
133 .name = "KEY",
134 .owner = THIS_MODULE,
135 .obj_size = sizeof(struct pfkey_sock),
136};
137
3f378b68
EP		 138static int pfkey_create(struct net *net, struct socket *sock, int protocol,
139 int kern)
1da177e4 140{
3fa87a32 141 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
1da177e4 142 struct sock *sk;
89e357d8 143 struct pfkey_sock *pfk;
1da177e4 144
df008c91 145 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 146 return -EPERM;
147 if (sock->type != SOCK_RAW)
148 return -ESOCKTNOSUPPORT;
149 if (protocol != PF_KEY_V2)
150 return -EPROTONOSUPPORT;
151
11aa9c28 152 sk = sk_alloc(net, PF_KEY, GFP_KERNEL, &key_proto, kern);
1da177e4 153 if (sk == NULL)
a925316a 154 return -ENOMEM;
8ff24541 155
89e357d8
YS		 156 pfk = pfkey_sk(sk);
157 mutex_init(&pfk->dump_lock);
158
1da177e4
LT		 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
3fa87a32 165 atomic_inc(&net_pfkey->socks_nr);
1da177e4
LT		 166
167 pfkey_insert(sk);
168
169 return 0;
1da177e4
LT		 170}
171
172static 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(&sk->sk_write_queue);
7f6b9dbd 184
185 synchronize_rcu();
1da177e4
LT		 186 sock_put(sk);
187
188 return 0;
189}
190
fc2d5cfd
ST		 191static int pfkey_broadcast_one(struct sk_buff *skb, gfp_t allocation,
192 struct sock *sk)
1da177e4
LT		 193{
194 int err = -ENOBUFS;
195
fc2d5cfd
ST		 196 if (atomic_read(&sk->sk_rmem_alloc) > sk->sk_rcvbuf)
197 return err;
198
199 skb = skb_clone(skb, allocation);
200
201 if (skb) {
202 skb_set_owner_r(skb, sk);
203 skb_queue_tail(&sk->sk_receive_queue, skb);
204 sk->sk_data_ready(sk);
205 err = 0;
1da177e4 206 }
1da177e4
LT		 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
36f41f8f 215static int pfkey_broadcast(struct sk_buff *skb, gfp_t allocation,
07fb0f17
AD		 216 int broadcast_flags, struct sock *one_sk,
217 struct net *net)
1da177e4 218{
3fa87a32 219 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
1da177e4 220 struct sock *sk;
1da177e4
LT		 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
7f6b9dbd 229 rcu_read_lock();
b67bfe0d 230 sk_for_each_rcu(sk, &net_pfkey->table) {
1da177e4
LT		 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)
fc2d5cfd 239 pfkey_broadcast_one(skb, GFP_ATOMIC, sk);
1da177e4
LT		 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
fc2d5cfd 254 err2 = pfkey_broadcast_one(skb, GFP_ATOMIC, sk);
1da177e4 255
f6b8dec9 256 /* Error is cleared after successful sending to at least one
1da177e4
LT		 257 * registered KM */
258 if ((broadcast_flags & BROADCAST_REGISTERED) && err)
259 err = err2;
260 }
7f6b9dbd 261 rcu_read_unlock();
1da177e4
LT		 262
263 if (one_sk != NULL)
fc2d5cfd 264 err = pfkey_broadcast_one(skb, allocation, one_sk);
1da177e4 265
1da177e4
LT		 266 kfree_skb(skb);
267 return err;
268}
269
05238204
TT		 270static int pfkey_do_dump(struct pfkey_sock *pfk)
271{
12a169e7 272 struct sadb_msg *hdr;
05238204
TT		 273 int rc;
274
89e357d8
YS		 275 mutex_lock(&pfk->dump_lock);
276 if (!pfk->dump.dump) {
277 rc = 0;
278 goto out;
279 }
280
05238204 281 rc = pfk->dump.dump(pfk);
89e357d8
YS		 282 if (rc == -ENOBUFS) {
283 rc = 0;
284 goto out;
285 }
05238204 286
12a169e7 287 if (pfk->dump.skb) {
89e357d8
YS		 288 if (!pfkey_can_dump(&pfk->sk)) {
289 rc = 0;
290 goto out;
291 }
12a169e7
HX		 292
293 hdr = (struct sadb_msg *) pfk->dump.skb->data;
294 hdr->sadb_msg_seq = 0;
295 hdr->sadb_msg_errno = rc;
36f41f8f 296 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
07fb0f17 297 &pfk->sk, sock_net(&pfk->sk));
12a169e7
HX		 298 pfk->dump.skb = NULL;
299 }
300
05238204 301 pfkey_terminate_dump(pfk);
89e357d8
YS		 302
303out:
304 mutex_unlock(&pfk->dump_lock);
05238204
TT		 305 return rc;
306}
307
4c93fbb0
DM		 308static inline void pfkey_hdr_dup(struct sadb_msg *new,
309 const struct sadb_msg *orig)
1da177e4
LT		 310{
311 *new = *orig;
312}
313
4c93fbb0 314static int pfkey_error(const struct sadb_msg *orig, int err, struct sock *sk)
1da177e4
LT		 315{
316 struct sk_buff *skb = alloc_skb(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;
09a62660 332 BUG_ON(err <= 0 || err >= 256);
1da177e4 333
4df864c1 334 hdr = skb_put(skb, sizeof(struct sadb_msg));
1da177e4
LT		 335 pfkey_hdr_dup(hdr, orig);
336 hdr->sadb_msg_errno = (uint8_t) err;
337 hdr->sadb_msg_len = (sizeof(struct sadb_msg) /
338 sizeof(uint64_t));
339
36f41f8f 340 pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ONE, sk, sock_net(sk));
1da177e4
LT		 341
342 return 0;
343}
344
8603b955 345static const u8 sadb_ext_min_len[] = {
1da177e4
LT		 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),
df71837d 370 [SADB_X_EXT_SEC_CTX] = (u8) sizeof(struct sadb_x_sec_ctx),
13c1d189 371 [SADB_X_EXT_KMADDRESS] = (u8) sizeof(struct sadb_x_kmaddress),
d2c5f658 372 [SADB_X_EXT_FILTER] = (u8) sizeof(struct sadb_x_filter),
1da177e4
LT		 373};
374
375/* Verify sadb_address_{len,prefixlen} against sa_family. */
4c93fbb0 376static int verify_address_len(const void *p)
1da177e4 377{
4c93fbb0
DM		 378 const struct sadb_address *sp = p;
379 const struct sockaddr *addr = (const struct sockaddr *)(sp + 1);
380 const struct sockaddr_in *sin;
dfd56b8b 381#if IS_ENABLED(CONFIG_IPV6)
4c93fbb0 382 const struct sockaddr_in6 *sin6;
1da177e4
LT		 383#endif
384 int len;
385
06b335cb
EB		 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
1da177e4
LT		 391 switch (addr->sa_family) {
392 case AF_INET:
356f89e1 393 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin), sizeof(uint64_t));
1da177e4
LT		 394 if (sp->sadb_address_len != len ||
395 sp->sadb_address_prefixlen > 32)
396 return -EINVAL;
397 break;
dfd56b8b 398#if IS_ENABLED(CONFIG_IPV6)
1da177e4 399 case AF_INET6:
356f89e1 400 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin6), sizeof(uint64_t));
1da177e4
LT		 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;
3ff50b79 417 }
1da177e4
LT		 418
419 return 0;
420}
421
4b66af2d
KE		 422static 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
430static 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
4c93fbb0 440static inline int pfkey_sec_ctx_len(const struct sadb_x_sec_ctx *sec_ctx)
df71837d 441{
356f89e1
IJ		 442 return DIV_ROUND_UP(sizeof(struct sadb_x_sec_ctx) +
443 sec_ctx->sadb_x_ctx_len,
444 sizeof(uint64_t));
df71837d
TJ		 445}
446
4c93fbb0 447static inline int verify_sec_ctx_len(const void *p)
df71837d 448{
4c93fbb0 449 const struct sadb_x_sec_ctx *sec_ctx = p;
298bb621 450 int len = sec_ctx->sadb_x_ctx_len;
df71837d 451
298bb621 452 if (len > PAGE_SIZE)
df71837d
TJ		 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
87536a81
NA		 463static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(const struct sadb_x_sec_ctx *sec_ctx,
464 gfp_t gfp)
df71837d
TJ		 465{
466 struct xfrm_user_sec_ctx *uctx = NULL;
467 int ctx_size = sec_ctx->sadb_x_ctx_len;
468
87536a81 469 uctx = kmalloc((sizeof(*uctx)+ctx_size), gfp);
df71837d
TJ		 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
4c93fbb0
DM		 485static int present_and_same_family(const struct sadb_address *src,
486 const struct sadb_address *dst)
1da177e4 487{
4c93fbb0 488 const struct sockaddr *s_addr, *d_addr;
1da177e4
LT		 489
490 if (!src || !dst)
491 return 0;
492
4c93fbb0
DM		 493 s_addr = (const struct sockaddr *)(src + 1);
494 d_addr = (const struct sockaddr *)(dst + 1);
1da177e4
LT		 495 if (s_addr->sa_family != d_addr->sa_family)
496 return 0;
497 if (s_addr->sa_family != AF_INET
dfd56b8b 498#if IS_ENABLED(CONFIG_IPV6)
1da177e4
LT		 499 && s_addr->sa_family != AF_INET6
500#endif
501 )
502 return 0;
503
504 return 1;
505}
506
4c93fbb0 507static int parse_exthdrs(struct sk_buff *skb, const struct sadb_msg *hdr, void **ext_hdrs)
1da177e4 508{
4c93fbb0 509 const char *p = (char *) hdr;
1da177e4
LT		 510 int len = skb->len;
511
512 len -= sizeof(*hdr);
513 p += sizeof(*hdr);
514 while (len > 0) {
4c93fbb0 515 const struct sadb_ext *ehdr = (const struct sadb_ext *) p;
1da177e4
LT		 516 uint16_t ext_type;
517 int ext_len;
518
4e765b49
EB		 519 if (len < sizeof(*ehdr))
520 return -EINVAL;
521
1da177e4
LT		 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;
4b66af2d
KE		 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:
1da177e4
LT		 541 if (verify_address_len(p))
542 return -EINVAL;
4b66af2d
KE		 543 break;
544 case SADB_X_EXT_SEC_CTX:
df71837d
TJ		 545 if (verify_sec_ctx_len(p))
546 return -EINVAL;
4b66af2d
KE		 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;
df71837d 555 }
4c93fbb0 556 ext_hdrs[ext_type-1] = (void *) p;
1da177e4
LT		 557 }
558 p += ext_len;
559 len -= ext_len;
560 }
561
562 return 0;
563}
564
565static uint16_t
566pfkey_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;
1da177e4
LT		 577 default:
578 return 0;
579 }
580 /* NOTREACHED */
581}
582
583static uint8_t
584pfkey_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;
1da177e4
LT		 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
603static uint8_t pfkey_proto_to_xfrm(uint8_t proto)
604{
a02cec21 605 return proto == IPSEC_PROTO_ANY ? 0 : proto;
1da177e4
LT		 606}
607
608static uint8_t pfkey_proto_from_xfrm(uint8_t proto)
609{
a02cec21 610 return proto ? proto : IPSEC_PROTO_ANY;
1da177e4
LT		 611}
612
9e8b4ed8
YH		 613static inline int pfkey_sockaddr_len(sa_family_t family)
614{
615 switch (family) {
616 case AF_INET:
617 return sizeof(struct sockaddr_in);
dfd56b8b 618#if IS_ENABLED(CONFIG_IPV6)
9e8b4ed8
YH		 619 case AF_INET6:
620 return sizeof(struct sockaddr_in6);
621#endif
622 }
623 return 0;
624}
625
5f95ac91
YH		 626static
627int pfkey_sockaddr_extract(const struct sockaddr *sa, xfrm_address_t *xaddr)
1da177e4 628{
5f95ac91 629 switch (sa->sa_family) {
1da177e4 630 case AF_INET:
8ff24541 631 xaddr->a4 =
5f95ac91 632 ((struct sockaddr_in *)sa)->sin_addr.s_addr;
1da177e4 633 return AF_INET;
dfd56b8b 634#if IS_ENABLED(CONFIG_IPV6)
1da177e4 635 case AF_INET6:
8ff24541 636 memcpy(xaddr->a6,
5f95ac91 637 &((struct sockaddr_in6 *)sa)->sin6_addr,
1da177e4
LT		 638 sizeof(struct in6_addr));
639 return AF_INET6;
640#endif
1da177e4 641 }
5f95ac91
YH		 642 return 0;
643}
644
645static
4c93fbb0 646int pfkey_sadb_addr2xfrm_addr(const struct sadb_address *addr, xfrm_address_t *xaddr)
5f95ac91
YH		 647{
648 return pfkey_sockaddr_extract((struct sockaddr *)(addr + 1),
649 xaddr);
1da177e4
LT		 650}
651
4c93fbb0 652static struct xfrm_state *pfkey_xfrm_state_lookup(struct net *net, const struct sadb_msg *hdr, void * const *ext_hdrs)
1da177e4 653{
4c93fbb0
DM		 654 const struct sadb_sa *sa;
655 const struct sadb_address *addr;
1da177e4
LT		 656 uint16_t proto;
657 unsigned short family;
658 xfrm_address_t *xaddr;
659
ea110733 660 sa = ext_hdrs[SADB_EXT_SA - 1];
1da177e4
LT		 661 if (sa == NULL)
662 return NULL;
663
664 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
665 if (proto == 0)
666 return NULL;
667
668 /* sadb_address_len should be checked by caller */
ea110733 669 addr = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
1da177e4
LT		 670 if (addr == NULL)
671 return NULL;
672
4c93fbb0 673 family = ((const struct sockaddr *)(addr + 1))->sa_family;
1da177e4
LT		 674 switch (family) {
675 case AF_INET:
4c93fbb0 676 xaddr = (xfrm_address_t *)&((const struct sockaddr_in *)(addr + 1))->sin_addr;
1da177e4 677 break;
dfd56b8b 678#if IS_ENABLED(CONFIG_IPV6)
1da177e4 679 case AF_INET6:
4c93fbb0 680 xaddr = (xfrm_address_t *)&((const struct sockaddr_in6 *)(addr + 1))->sin6_addr;
1da177e4
LT		 681 break;
682#endif
683 default:
684 xaddr = NULL;
685 }
686
687 if (!xaddr)
688 return NULL;
689
bd55775c 690 return xfrm_state_lookup(net, DUMMY_MARK, xaddr, sa->sadb_sa_spi, proto, family);
1da177e4
LT		 691}
692
693#define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1)))
9e8b4ed8 694
1da177e4
LT		 695static int
696pfkey_sockaddr_size(sa_family_t family)
697{
9e8b4ed8 698 return PFKEY_ALIGN8(pfkey_sockaddr_len(family));
1da177e4
LT		 699}
700
55569ce2
KM		 701static 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
715static 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
183cad12 730static unsigned int pfkey_sockaddr_fill(const xfrm_address_t *xaddr, __be16 port,
4c93fbb0
DM		 731 struct sockaddr *sa,
732 unsigned short family)
e5b56652
YH		 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 }
dfd56b8b 744#if IS_ENABLED(CONFIG_IPV6)
e5b56652
YH		 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;
15e318bd 751 sin6->sin6_addr = xaddr->in6;
e5b56652
YH		 752 sin6->sin6_scope_id = 0;
753 return 128;
754 }
755#endif
756 }
757 return 0;
758}
759
4c93fbb0 760static struct sk_buff *__pfkey_xfrm_state2msg(const struct xfrm_state *x,
050f009e 761 int add_keys, int hsc)
1da177e4
LT		 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;
df71837d
TJ		 770 struct sadb_x_sec_ctx *sec_ctx;
771 struct xfrm_sec_ctx *xfrm_ctx;
772 int ctx_size = 0;
1da177e4
LT		 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;
55569ce2 778 int mode;
1da177e4
LT		 779
780 /* address family check */
781 sockaddr_size = pfkey_sockaddr_size(x->props.family);
782 if (!sockaddr_size)
783 return ERR_PTR(-EINVAL);
784
785 /* base, SA, (lifetime (HSC),) address(SD), (address(P),)
786 key(AE), (identity(SD),) (sensitivity)> */
8ff24541 787 size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) +
1da177e4
LT		 788 sizeof(struct sadb_lifetime) +
789 ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) +
790 ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) +
8ff24541 791 sizeof(struct sadb_address)*2 +
1da177e4
LT		 792 sockaddr_size*2 +
793 sizeof(struct sadb_x_sa2);
df71837d
TJ		 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
1da177e4 800 /* identity & sensitivity */
70e94e66 801 if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr, x->props.family))
1da177e4
LT		 802 size += sizeof(struct sadb_address) + sockaddr_size;
803
804 if (add_keys) {
805 if (x->aalg && x->aalg->alg_key_len) {
8ff24541
YH		 806 auth_key_size =
807 PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8);
1da177e4
LT		 808 size += sizeof(struct sadb_key) + auth_key_size;
809 }
810 if (x->ealg && x->ealg->alg_key_len) {
8ff24541
YH		 811 encrypt_key_size =
812 PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8);
1da177e4
LT		 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 + 16, GFP_ATOMIC);
826 if (skb == NULL)
827 return ERR_PTR(-ENOBUFS);
828
829 /* call should fill header later */
4df864c1 830 hdr = skb_put(skb, sizeof(struct sadb_msg));
1da177e4
LT		 831 memset(hdr, 0, size); /* XXX do we need this ? */
832 hdr->sadb_msg_len = size / sizeof(uint64_t);
833
834 /* sa */
4df864c1 835 sa = skb_put(skb, sizeof(struct sadb_sa));
1da177e4
LT		 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;
4f09f0bb
HX		 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:
1da177e4 846 sa->sadb_sa_state = SADB_SASTATE_LARVAL;
4f09f0bb
HX		 847 break;
848 default:
1da177e4 849 sa->sadb_sa_state = SADB_SASTATE_DEAD;
4f09f0bb
HX		 850 break;
851 }
1da177e4
LT		 852 sa->sadb_sa_auth = 0;
853 if (x->aalg) {
854 struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
7e50f84c
JK		 855 sa->sadb_sa_auth = (a && a->pfkey_supported) ?
856 a->desc.sadb_alg_id : 0;
1da177e4
LT		 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(x->ealg->alg_name, 0);
7e50f84c
JK		 862 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
863 a->desc.sadb_alg_id : 0;
1da177e4
LT		 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(x->calg->alg_name, 0);
7e50f84c
JK		 868 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
869 a->desc.sadb_alg_id : 0;
1da177e4
LT		 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;
dd87147e
HX		 877 if (x->props.flags & XFRM_STATE_NOPMTUDISC)
878 sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC;
1da177e4
LT		 879
880 /* hard time */
881 if (hsc & 2) {
4df864c1 882 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
1da177e4
LT		 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) {
4df864c1 893 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
1da177e4
LT		 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 */
4df864c1 903 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
1da177e4
LT		 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 */
4df864c1 912 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
8ff24541 913 addr->sadb_address_len =
1da177e4
LT		 914 (sizeof(struct sadb_address)+sockaddr_size)/
915 sizeof(uint64_t);
916 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
8ff24541
YH		 917 /* "if the ports are non-zero, then the sadb_address_proto field,
918 normally zero, MUST be filled in with the transport
1da177e4 919 protocol's number." - RFC2367 */
8ff24541 920 addr->sadb_address_proto = 0;
1da177e4 921 addr->sadb_address_reserved = 0;
1da177e4 922
e5b56652
YH		 923 addr->sadb_address_prefixlen =
924 pfkey_sockaddr_fill(&x->props.saddr, 0,
925 (struct sockaddr *) (addr + 1),
926 x->props.family);
de47c5d8 927 BUG_ON(!addr->sadb_address_prefixlen);
1da177e4
LT		 928
929 /* dst address */
4df864c1 930 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
8ff24541 931 addr->sadb_address_len =
1da177e4
LT		 932 (sizeof(struct sadb_address)+sockaddr_size)/
933 sizeof(uint64_t);
934 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
8ff24541 935 addr->sadb_address_proto = 0;
1da177e4 936 addr->sadb_address_reserved = 0;
1da177e4 937
e5b56652
YH		 938 addr->sadb_address_prefixlen =
939 pfkey_sockaddr_fill(&x->id.daddr, 0,
940 (struct sockaddr *) (addr + 1),
941 x->props.family);
de47c5d8 942 BUG_ON(!addr->sadb_address_prefixlen);
1da177e4 943
70e94e66
YH		 944 if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr,
945 x->props.family)) {
4df864c1
JB		 946 addr = skb_put(skb,
947 sizeof(struct sadb_address) + sockaddr_size);
e5b56652
YH		 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(x->sel.proto);
954 addr->sadb_address_prefixlen = x->sel.prefixlen_s;
955 addr->sadb_address_reserved = 0;
1da177e4 956
e5b56652
YH		 957 pfkey_sockaddr_fill(&x->sel.saddr, x->sel.sport,
958 (struct sockaddr *) (addr + 1),
959 x->props.family);
1da177e4 960 }
1da177e4
LT		 961
962 /* auth key */
963 if (add_keys && auth_key_size) {
4df864c1 964 key = skb_put(skb, sizeof(struct sadb_key) + auth_key_size);
1da177e4
LT		 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) {
4df864c1 974 key = skb_put(skb, sizeof(struct sadb_key) + encrypt_key_size);
8ff24541 975 key->sadb_key_len = (sizeof(struct sadb_key) +
1da177e4
LT		 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;
8ff24541 980 memcpy(key + 1, x->ealg->alg_key,
1da177e4
LT		 981 (x->ealg->alg_key_len+7)/8);
982 }
983
984 /* sa */
4df864c1 985 sa2 = skb_put(skb, sizeof(struct sadb_x_sa2));
1da177e4
LT		 986 sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t);
987 sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
55569ce2
KM		 988 if ((mode = pfkey_mode_from_xfrm(x->props.mode)) < 0) {
989 kfree_skb(skb);
990 return ERR_PTR(-EINVAL);
991 }
992 sa2->sadb_x_sa2_mode = mode;
1da177e4
LT		 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 */
4df864c1 1003 n_type = skb_put(skb, sizeof(*n_type));
1da177e4
LT		 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 */
4df864c1 1012 n_port = skb_put(skb, sizeof(*n_port));
1da177e4
LT		 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 */
4df864c1 1019 n_port = skb_put(skb, sizeof(*n_port));
1da177e4
LT		 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
df71837d
TJ		 1026 /* security context */
1027 if (xfrm_ctx) {
4df864c1
JB		 1028 sec_ctx = skb_put(skb,
1029 sizeof(struct sadb_x_sec_ctx) + ctx_size);
df71837d
TJ		 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
1da177e4
LT		 1040 return skb;
1041}
1042
050f009e 1043
4c93fbb0 1044static inline struct sk_buff *pfkey_xfrm_state2msg(const struct xfrm_state *x)
050f009e
HX		 1045{
1046 struct sk_buff *skb;
1047
050f009e 1048 skb = __pfkey_xfrm_state2msg(x, 1, 3);
050f009e
HX		 1049
1050 return skb;
1051}
1052
4c93fbb0 1053static inline struct sk_buff *pfkey_xfrm_state2msg_expire(const struct xfrm_state *x,
050f009e
HX		 1054 int hsc)
1055{
1056 return __pfkey_xfrm_state2msg(x, 0, hsc);
1057}
1058
07fb0f17 1059static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net,
4c93fbb0
DM		 1060 const struct sadb_msg *hdr,
1061 void * const *ext_hdrs)
1da177e4 1062{
8ff24541 1063 struct xfrm_state *x;
4c93fbb0
DM		 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;
1da177e4
LT		 1068 uint16_t proto;
1069 int err;
8ff24541 1070
1da177e4 1071
ea110733 1072 sa = ext_hdrs[SADB_EXT_SA - 1];
1da177e4
LT		 1073 if (!sa ||
1074 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1075 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1076 return ERR_PTR(-EINVAL);
1077 if (hdr->sadb_msg_satype == SADB_SATYPE_ESP &&
1078 !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1])
1079 return ERR_PTR(-EINVAL);
1080 if (hdr->sadb_msg_satype == SADB_SATYPE_AH &&
1081 !ext_hdrs[SADB_EXT_KEY_AUTH-1])
1082 return ERR_PTR(-EINVAL);
1083 if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] !=
1084 !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1])
1085 return ERR_PTR(-EINVAL);
1086
1087 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1088 if (proto == 0)
1089 return ERR_PTR(-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
8ff24541 1103 However, KAME setkey always uses SADB_SASTATE_LARVAL.
1da177e4
LT		 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(-EINVAL);
ea110733 1111 key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1da177e4
LT		 1112 if (key != NULL &&
1113 sa->sadb_sa_auth != SADB_X_AALG_NULL &&
4b66af2d 1114 key->sadb_key_bits == 0)
1da177e4
LT		 1115 return ERR_PTR(-EINVAL);
1116 key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1117 if (key != NULL &&
1118 sa->sadb_sa_encrypt != SADB_EALG_NULL &&
4b66af2d 1119 key->sadb_key_bits == 0)
1da177e4
LT		 1120 return ERR_PTR(-EINVAL);
1121
07fb0f17 1122 x = xfrm_state_alloc(net);
1da177e4
LT		 1123 if (x == NULL)
1124 return ERR_PTR(-ENOBUFS);
1125
1126 x->id.proto = proto;
1127 x->id.spi = sa->sadb_sa_spi;
33fce60d
FD		 1128 x->props.replay_window = min_t(unsigned int, sa->sadb_sa_replay,
1129 (sizeof(x->replay.bitmap) * 8));
1da177e4
LT		 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;
dd87147e
HX		 1134 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC)
1135 x->props.flags |= XFRM_STATE_NOPMTUDISC;
1da177e4 1136
ea110733 1137 lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD - 1];
1da177e4
LT		 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 }
ea110733 1144 lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT - 1];
1da177e4
LT		 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 }
df71837d 1151
ea110733 1152 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
df71837d 1153 if (sec_ctx != NULL) {
87536a81 1154 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
df71837d
TJ		 1155
1156 if (!uctx)
1157 goto out;
1158
1159 err = security_xfrm_state_alloc(x, uctx);
1160 kfree(uctx);
1161
1162 if (err)
1163 goto out;
1164 }
1165
e747f643 1166 err = -ENOBUFS;
ea110733 1167 key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1da177e4
LT		 1168 if (sa->sadb_sa_auth) {
1169 int keysize = 0;
1170 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth);
7e50f84c 1171 if (!a || !a->pfkey_supported) {
1da177e4
LT		 1172 err = -ENOSYS;
1173 goto out;
1174 }
1175 if (key)
1176 keysize = (key->sadb_key_bits + 7) / 8;
1177 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL);
1e3d0c2c
DC		 1178 if (!x->aalg) {
1179 err = -ENOMEM;
1da177e4 1180 goto out;
1e3d0c2c 1181 }
1da177e4
LT		 1182 strcpy(x->aalg->alg_name, 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 }
c20a66f4 1188 x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits;
1da177e4
LT		 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(sa->sadb_sa_encrypt);
7e50f84c 1195 if (!a || !a->pfkey_supported) {
1da177e4
LT		 1196 err = -ENOSYS;
1197 goto out;
1198 }
1199 x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL);
1e3d0c2c
DC		 1200 if (!x->calg) {
1201 err = -ENOMEM;
1da177e4 1202 goto out;
1e3d0c2c 1203 }
1da177e4
LT		 1204 strcpy(x->calg->alg_name, 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(sa->sadb_sa_encrypt);
7e50f84c 1209 if (!a || !a->pfkey_supported) {
1da177e4
LT		 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(sizeof(*x->ealg) + keysize, GFP_KERNEL);
1e3d0c2c
DC		 1217 if (!x->ealg) {
1218 err = -ENOMEM;
1da177e4 1219 goto out;
1e3d0c2c 1220 }
1da177e4
LT		 1221 strcpy(x->ealg->alg_name, 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;
69b0137f 1228 x->geniv = a->uinfo.encr.geniv;
1da177e4
LT		 1229 }
1230 }
1231 /* x->algo.flags = sa->sadb_sa_flags; */
1232
8ff24541 1233 x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1da177e4 1234 &x->props.saddr);
8ff24541 1235 pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1da177e4
LT		 1236 &x->id.daddr);
1237
1238 if (ext_hdrs[SADB_X_EXT_SA2-1]) {
4c93fbb0 1239 const struct sadb_x_sa2 *sa2 = ext_hdrs[SADB_X_EXT_SA2-1];
55569ce2
KM		 1240 int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1241 if (mode < 0) {
1242 err = -EINVAL;
1243 goto out;
1244 }
1245 x->props.mode = mode;
1da177e4
LT		 1246 x->props.reqid = sa2->sadb_x_sa2_reqid;
1247 }
1248
1249 if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
4c93fbb0 1250 const struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];
1da177e4
LT		 1251
1252 /* Nobody uses this, but we try. */
1253 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr);
1254 x->sel.prefixlen_s = addr->sadb_address_prefixlen;
1255 }
1256
4da51056 1257 if (!x->sel.family)
4a4b6271
JL		 1258 x->sel.family = x->props.family;
1259
1da177e4 1260 if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
4c93fbb0 1261 const struct sadb_x_nat_t_type* n_type;
1da177e4
LT		 1262 struct xfrm_encap_tmpl *natt;
1263
1264 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL);
1e3d0c2c
DC		 1265 if (!x->encap) {
1266 err = -ENOMEM;
1da177e4 1267 goto out;
1e3d0c2c 1268 }
1da177e4
LT		 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]) {
4c93fbb0 1275 const struct sadb_x_nat_t_port *n_port =
1da177e4
LT		 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]) {
4c93fbb0 1280 const struct sadb_x_nat_t_port *n_port =
1da177e4
LT		 1281 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1];
1282 natt->encap_dport = n_port->sadb_x_nat_t_port_port;
1283 }
a8d694c6 1284 memset(&natt->encap_oa, 0, sizeof(natt->encap_oa));
1da177e4
LT		 1285 }
1286
72cb6962
HX		 1287 err = xfrm_init_state(x);
1288 if (err)
1da177e4 1289 goto out;
72cb6962 1290
1da177e4 1291 x->km.seq = hdr->sadb_msg_seq;
1da177e4
LT		 1292 return x;
1293
1294out:
1295 x->km.state = XFRM_STATE_DEAD;
1296 xfrm_state_put(x);
1297 return ERR_PTR(err);
1298}
1299
4c93fbb0 1300static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1da177e4
LT		 1301{
1302 return -EOPNOTSUPP;
1303}
1304
4c93fbb0 1305static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1da177e4 1306{
07fb0f17 1307 struct net *net = sock_net(sk);
1da177e4
LT		 1308 struct sk_buff *resp_skb;
1309 struct sadb_x_sa2 *sa2;
1310 struct sadb_address *saddr, *daddr;
1311 struct sadb_msg *out_hdr;
658b219e 1312 struct sadb_spirange *range;
1da177e4 1313 struct xfrm_state *x = NULL;
55569ce2 1314 int mode;
658b219e
HX		 1315 int err;
1316 u32 min_spi, max_spi;
1da177e4
LT		 1317 u32 reqid;
1318 u8 proto;
1319 unsigned short family;
1320 xfrm_address_t *xsaddr = NULL, *xdaddr = NULL;
1321
1322 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1323 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1324 return -EINVAL;
1325
1326 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1327 if (proto == 0)
1328 return -EINVAL;
1329
1330 if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) {
55569ce2
KM		 1331 mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1332 if (mode < 0)
1333 return -EINVAL;
1da177e4
LT		 1334 reqid = sa2->sadb_x_sa2_reqid;
1335 } else {
1336 mode = 0;
1337 reqid = 0;
1338 }
1339
1340 saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1341 daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1342
1343 family = ((struct sockaddr *)(saddr + 1))->sa_family;
1344 switch (family) {
1345 case AF_INET:
1346 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr;
1347 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr;
1348 break;
dfd56b8b 1349#if IS_ENABLED(CONFIG_IPV6)
1da177e4
LT		 1350 case AF_INET6:
1351 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr;
1352 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr;
1353 break;
1354#endif
1355 }
1356
1357 if (hdr->sadb_msg_seq) {
bd55775c 1358 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
70e94e66 1359 if (x && !xfrm_addr_equal(&x->id.daddr, xdaddr, family)) {
1da177e4
LT		 1360 xfrm_state_put(x);
1361 x = NULL;
1362 }
1363 }
1364
1365 if (!x)
7e652640 1366 x = xfrm_find_acq(net, &dummy_mark, mode, reqid, 0, proto, xdaddr, xsaddr, 1, family);
1da177e4
LT		 1367
1368 if (x == NULL)
1369 return -ENOENT;
1370
658b219e
HX		 1371 min_spi = 0x100;
1372 max_spi = 0x0fffffff;
1da177e4 1373
658b219e
HX		 1374 range = ext_hdrs[SADB_EXT_SPIRANGE-1];
1375 if (range) {
1376 min_spi = range->sadb_spirange_min;
1377 max_spi = range->sadb_spirange_max;
1da177e4 1378 }
658b219e 1379
776e9dd9
FD		 1380 err = verify_spi_info(x->id.proto, min_spi, max_spi);
1381 if (err) {
1382 xfrm_state_put(x);
1383 return err;
1384 }
1385
658b219e 1386 err = xfrm_alloc_spi(x, min_spi, max_spi);
050f009e 1387 resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x);
1da177e4
LT		 1388
1389 if (IS_ERR(resp_skb)) {
1390 xfrm_state_put(x);
1391 return PTR_ERR(resp_skb);
1392 }
1393
1394 out_hdr = (struct sadb_msg *) resp_skb->data;
1395 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1396 out_hdr->sadb_msg_type = SADB_GETSPI;
1397 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1398 out_hdr->sadb_msg_errno = 0;
1399 out_hdr->sadb_msg_reserved = 0;
1400 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1401 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1402
1403 xfrm_state_put(x);
1404
36f41f8f 1405 pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk, net);
1da177e4
LT		 1406
1407 return 0;
1408}
1409
4c93fbb0 1410static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1da177e4 1411{
07fb0f17 1412 struct net *net = sock_net(sk);
1da177e4
LT		 1413 struct xfrm_state *x;
1414
1415 if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8)
1416 return -EOPNOTSUPP;
1417
1418 if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
1419 return 0;
1420
bd55775c 1421 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1da177e4
LT		 1422 if (x == NULL)
1423 return 0;
1424
1425 spin_lock_bh(&x->lock);
5b8ef341 1426 if (x->km.state == XFRM_STATE_ACQ)
1da177e4 1427 x->km.state = XFRM_STATE_ERROR;
5b8ef341 1428
1da177e4
LT		 1429 spin_unlock_bh(&x->lock);
1430 xfrm_state_put(x);
1431 return 0;
1432}
1433
26b15dad
JHS		 1434static inline int event2poltype(int event)
1435{
1436 switch (event) {
f60f6b8f 1437 case XFRM_MSG_DELPOLICY:
26b15dad 1438 return SADB_X_SPDDELETE;
f60f6b8f 1439 case XFRM_MSG_NEWPOLICY:
26b15dad 1440 return SADB_X_SPDADD;
f60f6b8f 1441 case XFRM_MSG_UPDPOLICY:
26b15dad 1442 return SADB_X_SPDUPDATE;
f60f6b8f 1443 case XFRM_MSG_POLEXPIRE:
26b15dad
JHS		 1444 // return SADB_X_SPDEXPIRE;
1445 default:
207024b9 1446 pr_err("pfkey: Unknown policy event %d\n", event);
26b15dad
JHS		 1447 break;
1448 }
1449
1450 return 0;
1451}
1452
1453static inline int event2keytype(int event)
1454{
1455 switch (event) {
f60f6b8f 1456 case XFRM_MSG_DELSA:
26b15dad 1457 return SADB_DELETE;
f60f6b8f 1458 case XFRM_MSG_NEWSA:
26b15dad 1459 return SADB_ADD;
f60f6b8f 1460 case XFRM_MSG_UPDSA:
26b15dad 1461 return SADB_UPDATE;
f60f6b8f 1462 case XFRM_MSG_EXPIRE:
26b15dad
JHS		 1463 return SADB_EXPIRE;
1464 default:
207024b9 1465 pr_err("pfkey: Unknown SA event %d\n", event);
26b15dad
JHS		 1466 break;
1467 }
1468
1469 return 0;
1470}
1471
1472/* ADD/UPD/DEL */
214e005b 1473static int key_notify_sa(struct xfrm_state *x, const struct km_event *c)
26b15dad
JHS		 1474{
1475 struct sk_buff *skb;
1476 struct sadb_msg *hdr;
26b15dad 1477
050f009e 1478 skb = pfkey_xfrm_state2msg(x);
26b15dad
JHS		 1479
1480 if (IS_ERR(skb))
1481 return PTR_ERR(skb);
1482
1483 hdr = (struct sadb_msg *) skb->data;
1484 hdr->sadb_msg_version = PF_KEY_V2;
1485 hdr->sadb_msg_type = event2keytype(c->event);
1486 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1487 hdr->sadb_msg_errno = 0;
1488 hdr->sadb_msg_reserved = 0;
1489 hdr->sadb_msg_seq = c->seq;
15e47304 1490 hdr->sadb_msg_pid = c->portid;
26b15dad 1491
36f41f8f 1492 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xs_net(x));
26b15dad
JHS		 1493
1494 return 0;
1495}
1da177e4 1496
4c93fbb0 1497static int pfkey_add(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1da177e4 1498{
07fb0f17 1499 struct net *net = sock_net(sk);
1da177e4
LT		 1500 struct xfrm_state *x;
1501 int err;
26b15dad 1502 struct km_event c;
1da177e4 1503
07fb0f17 1504 x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs);
1da177e4
LT		 1505 if (IS_ERR(x))
1506 return PTR_ERR(x);
1507
26b15dad 1508 xfrm_state_hold(x);
1da177e4
LT		 1509 if (hdr->sadb_msg_type == SADB_ADD)
1510 err = xfrm_state_add(x);
1511 else
1512 err = xfrm_state_update(x);
1513
2e71029e 1514 xfrm_audit_state_add(x, err ? 0 : 1, true);
161a09e7 1515
1da177e4
LT		 1516 if (err < 0) {
1517 x->km.state = XFRM_STATE_DEAD;
21380b81 1518 __xfrm_state_put(x);
7d6dfe1f 1519 goto out;
1da177e4
LT		 1520 }
1521
26b15dad 1522 if (hdr->sadb_msg_type == SADB_ADD)
f60f6b8f 1523 c.event = XFRM_MSG_NEWSA;
26b15dad 1524 else
f60f6b8f 1525 c.event = XFRM_MSG_UPDSA;
26b15dad 1526 c.seq = hdr->sadb_msg_seq;
15e47304 1527 c.portid = hdr->sadb_msg_pid;
26b15dad 1528 km_state_notify(x, &c);
7d6dfe1f 1529out:
26b15dad 1530 xfrm_state_put(x);
26b15dad 1531 return err;
1da177e4
LT		 1532}
1533
4c93fbb0 1534static int pfkey_delete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1da177e4 1535{
07fb0f17 1536 struct net *net = sock_net(sk);
1da177e4 1537 struct xfrm_state *x;
26b15dad
JHS		 1538 struct km_event c;
1539 int err;
1da177e4
LT		 1540
1541 if (!ext_hdrs[SADB_EXT_SA-1] ||
1542 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1543 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1544 return -EINVAL;
1545
07fb0f17 1546 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1da177e4
LT		 1547 if (x == NULL)
1548 return -ESRCH;
1549
c8c05a8e
CZ		 1550 if ((err = security_xfrm_state_delete(x)))
1551 goto out;
1552
1da177e4 1553 if (xfrm_state_kern(x)) {
c8c05a8e
CZ		 1554 err = -EPERM;
1555 goto out;
1da177e4 1556 }
161a09e7 1557
26b15dad 1558 err = xfrm_state_delete(x);
161a09e7 1559
c8c05a8e
CZ		 1560 if (err < 0)
1561 goto out;
1da177e4 1562
26b15dad 1563 c.seq = hdr->sadb_msg_seq;
15e47304 1564 c.portid = hdr->sadb_msg_pid;
f60f6b8f 1565 c.event = XFRM_MSG_DELSA;
26b15dad 1566 km_state_notify(x, &c);
c8c05a8e 1567out:
2e71029e 1568 xfrm_audit_state_delete(x, err ? 0 : 1, true);
26b15dad 1569 xfrm_state_put(x);
1da177e4 1570
26b15dad 1571 return err;
1da177e4
LT		 1572}
1573
4c93fbb0 1574static int pfkey_get(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1da177e4 1575{
07fb0f17 1576 struct net *net = sock_net(sk);
1da177e4
LT		 1577 __u8 proto;
1578 struct sk_buff *out_skb;
1579 struct sadb_msg *out_hdr;
1580 struct xfrm_state *x;
1581
1582 if (!ext_hdrs[SADB_EXT_SA-1] ||
1583 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1584 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1585 return -EINVAL;
1586
07fb0f17 1587 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1da177e4
LT		 1588 if (x == NULL)
1589 return -ESRCH;
1590
050f009e 1591 out_skb = pfkey_xfrm_state2msg(x);
1da177e4
LT		 1592 proto = x->id.proto;
1593 xfrm_state_put(x);
1594 if (IS_ERR(out_skb))
1595 return PTR_ERR(out_skb);
1596
1597 out_hdr = (struct sadb_msg *) out_skb->data;
1598 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
435000be 1599 out_hdr->sadb_msg_type = SADB_GET;
1da177e4
LT		 1600 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1601 out_hdr->sadb_msg_errno = 0;
1602 out_hdr->sadb_msg_reserved = 0;
1603 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1604 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
36f41f8f 1605 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1da177e4
LT		 1606
1607 return 0;
1608}
1609
4c93fbb0 1610static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig,
dd0fc66f 1611 gfp_t allocation)
1da177e4
LT		 1612{
1613 struct sk_buff *skb;
1614 struct sadb_msg *hdr;
1615 int len, auth_len, enc_len, i;
1616
7e50f84c 1617 auth_len = xfrm_count_pfkey_auth_supported();
1da177e4
LT		 1618 if (auth_len) {
1619 auth_len *= sizeof(struct sadb_alg);
1620 auth_len += sizeof(struct sadb_supported);
1621 }
8ff24541 1622
7e50f84c 1623 enc_len = xfrm_count_pfkey_enc_supported();
1da177e4
LT		 1624 if (enc_len) {
1625 enc_len *= sizeof(struct sadb_alg);
1626 enc_len += sizeof(struct sadb_supported);
1627 }
8ff24541 1628
1da177e4
LT		 1629 len = enc_len + auth_len + sizeof(struct sadb_msg);
1630
1631 skb = alloc_skb(len + 16, allocation);
1632 if (!skb)
1633 goto out_put_algs;
1634
4df864c1 1635 hdr = skb_put(skb, sizeof(*hdr));
1da177e4
LT		 1636 pfkey_hdr_dup(hdr, orig);
1637 hdr->sadb_msg_errno = 0;
1638 hdr->sadb_msg_len = len / sizeof(uint64_t);
1639
1640 if (auth_len) {
1641 struct sadb_supported *sp;
1642 struct sadb_alg *ap;
1643
4df864c1 1644 sp = skb_put(skb, auth_len);
1da177e4
LT		 1645 ap = (struct sadb_alg *) (sp + 1);
1646
1647 sp->sadb_supported_len = auth_len / sizeof(uint64_t);
1648 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
1649
1650 for (i = 0; ; i++) {
1651 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1652 if (!aalg)
1653 break;
7e50f84c
JK		 1654 if (!aalg->pfkey_supported)
1655 continue;
1da177e4
LT		 1656 if (aalg->available)
1657 *ap++ = aalg->desc;
1658 }
1659 }
1660
1661 if (enc_len) {
1662 struct sadb_supported *sp;
1663 struct sadb_alg *ap;
1664
4df864c1 1665 sp = skb_put(skb, enc_len);
1da177e4
LT		 1666 ap = (struct sadb_alg *) (sp + 1);
1667
1668 sp->sadb_supported_len = enc_len / sizeof(uint64_t);
1669 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
1670
1671 for (i = 0; ; i++) {
1672 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1673 if (!ealg)
1674 break;
7e50f84c
JK		 1675 if (!ealg->pfkey_supported)
1676 continue;
1da177e4
LT		 1677 if (ealg->available)
1678 *ap++ = ealg->desc;
1679 }
1680 }
1681
1682out_put_algs:
1683 return skb;
1684}
1685
4c93fbb0 1686static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1da177e4
LT		 1687{
1688 struct pfkey_sock *pfk = pfkey_sk(sk);
1689 struct sk_buff *supp_skb;
1690
1691 if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
1692 return -EINVAL;
1693
1694 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
1695 if (pfk->registered&(1<<hdr->sadb_msg_satype))
1696 return -EEXIST;
1697 pfk->registered |= (1<<hdr->sadb_msg_satype);
1698 }
1699
1700 xfrm_probe_algs();
8ff24541 1701
9a564bcc 1702 supp_skb = compose_sadb_supported(hdr, GFP_KERNEL | __GFP_ZERO);
1da177e4
LT		 1703 if (!supp_skb) {
1704 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1705 pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1706
1707 return -ENOBUFS;
1708 }
1709
36f41f8f
ED		 1710 pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk,
1711 sock_net(sk));
1da177e4
LT		 1712 return 0;
1713}
1714
4c93fbb0 1715static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr)
8be987d7
JHS		 1716{
1717 struct sk_buff *skb;
1718 struct sadb_msg *hdr;
1719
1720 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1721 if (!skb)
1722 return -ENOBUFS;
1723
59ae1d12 1724 hdr = skb_put_data(skb, ihdr, sizeof(struct sadb_msg));
8be987d7
JHS		 1725 hdr->sadb_msg_errno = (uint8_t) 0;
1726 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1727
36f41f8f
ED		 1728 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ONE, sk,
1729 sock_net(sk));
8be987d7
JHS		 1730}
1731
214e005b 1732static int key_notify_sa_flush(const struct km_event *c)
26b15dad
JHS		 1733{
1734 struct sk_buff *skb;
1735 struct sadb_msg *hdr;
1736
1737 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1738 if (!skb)
1739 return -ENOBUFS;
4df864c1 1740 hdr = skb_put(skb, sizeof(struct sadb_msg));
bf08867f 1741 hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
151bb0ff 1742 hdr->sadb_msg_type = SADB_FLUSH;
26b15dad 1743 hdr->sadb_msg_seq = c->seq;
15e47304 1744 hdr->sadb_msg_pid = c->portid;
26b15dad
JHS		 1745 hdr->sadb_msg_version = PF_KEY_V2;
1746 hdr->sadb_msg_errno = (uint8_t) 0;
1747 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
a5cc68f3 1748 hdr->sadb_msg_reserved = 0;
26b15dad 1749
36f41f8f 1750 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
26b15dad
JHS		 1751
1752 return 0;
1753}
1754
4c93fbb0 1755static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1da177e4 1756{
07fb0f17 1757 struct net *net = sock_net(sk);
95c96174 1758 unsigned int proto;
26b15dad 1759 struct km_event c;
8be987d7 1760 int err, err2;
1da177e4
LT		 1761
1762 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1763 if (proto == 0)
1764 return -EINVAL;
1765
f75a2804 1766 err = xfrm_state_flush(net, proto, true, false);
8be987d7 1767 err2 = unicast_flush_resp(sk, hdr);
9e64cc95
JHS		 1768 if (err || err2) {
1769 if (err == -ESRCH) /* empty table - go quietly */
1770 err = 0;
8be987d7 1771 return err ? err : err2;
9e64cc95 1772 }
8be987d7 1773
bf08867f 1774 c.data.proto = proto;
26b15dad 1775 c.seq = hdr->sadb_msg_seq;
15e47304 1776 c.portid = hdr->sadb_msg_pid;
f60f6b8f 1777 c.event = XFRM_MSG_FLUSHSA;
07fb0f17 1778 c.net = net;
26b15dad 1779 km_state_notify(NULL, &c);
1da177e4
LT		 1780
1781 return 0;
1782}
1783
1da177e4
LT		 1784static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1785{
83321d6b 1786 struct pfkey_sock *pfk = ptr;
1da177e4
LT		 1787 struct sk_buff *out_skb;
1788 struct sadb_msg *out_hdr;
1789
83321d6b
TT		 1790 if (!pfkey_can_dump(&pfk->sk))
1791 return -ENOBUFS;
1792
050f009e 1793 out_skb = pfkey_xfrm_state2msg(x);
1da177e4
LT		 1794 if (IS_ERR(out_skb))
1795 return PTR_ERR(out_skb);
1796
1797 out_hdr = (struct sadb_msg *) out_skb->data;
83321d6b 1798 out_hdr->sadb_msg_version = pfk->dump.msg_version;
1da177e4
LT		 1799 out_hdr->sadb_msg_type = SADB_DUMP;
1800 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1801 out_hdr->sadb_msg_errno = 0;
1802 out_hdr->sadb_msg_reserved = 0;
12a169e7 1803 out_hdr->sadb_msg_seq = count + 1;
15e47304 1804 out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
12a169e7
HX		 1805
1806 if (pfk->dump.skb)
36f41f8f 1807 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
07fb0f17 1808 &pfk->sk, sock_net(&pfk->sk));
12a169e7
HX		 1809 pfk->dump.skb = out_skb;
1810
1da177e4
LT		 1811 return 0;
1812}
1813
83321d6b
TT		 1814static int pfkey_dump_sa(struct pfkey_sock *pfk)
1815{
07fb0f17
AD		 1816 struct net *net = sock_net(&pfk->sk);
1817 return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk);
83321d6b
TT		 1818}
1819
1820static void pfkey_dump_sa_done(struct pfkey_sock *pfk)
1821{
283bc9f3
FD		 1822 struct net *net = sock_net(&pfk->sk);
1823
1824 xfrm_state_walk_done(&pfk->dump.u.state, net);
83321d6b
TT		 1825}
1826
4c93fbb0 1827static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1da177e4
LT		 1828{
1829 u8 proto;
870a2df4 1830 struct xfrm_address_filter *filter = NULL;
83321d6b
TT		 1831 struct pfkey_sock *pfk = pfkey_sk(sk);
1832
89e357d8
YS		 1833 mutex_lock(&pfk->dump_lock);
1834 if (pfk->dump.dump != NULL) {
1835 mutex_unlock(&pfk->dump_lock);
83321d6b 1836 return -EBUSY;
89e357d8 1837 }
1da177e4
LT		 1838
1839 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
89e357d8
YS		 1840 if (proto == 0) {
1841 mutex_unlock(&pfk->dump_lock);
1da177e4 1842 return -EINVAL;
89e357d8 1843 }
1da177e4 1844
d3623099
ND		 1845 if (ext_hdrs[SADB_X_EXT_FILTER - 1]) {
1846 struct sadb_x_filter *xfilter = ext_hdrs[SADB_X_EXT_FILTER - 1];
1847
37bd2242
MS		 1848 if ((xfilter->sadb_x_filter_splen >=
1849 (sizeof(xfrm_address_t) << 3)) ||
1850 (xfilter->sadb_x_filter_dplen >=
1851 (sizeof(xfrm_address_t) << 3))) {
1852 mutex_unlock(&pfk->dump_lock);
1853 return -EINVAL;
1854 }
d3623099 1855 filter = kmalloc(sizeof(*filter), GFP_KERNEL);
89e357d8
YS		 1856 if (filter == NULL) {
1857 mutex_unlock(&pfk->dump_lock);
d3623099 1858 return -ENOMEM;
89e357d8 1859 }
d3623099
ND		 1860
1861 memcpy(&filter->saddr, &xfilter->sadb_x_filter_saddr,
1862 sizeof(xfrm_address_t));
1863 memcpy(&filter->daddr, &xfilter->sadb_x_filter_daddr,
1864 sizeof(xfrm_address_t));
1865 filter->family = xfilter->sadb_x_filter_family;
1866 filter->splen = xfilter->sadb_x_filter_splen;
1867 filter->dplen = xfilter->sadb_x_filter_dplen;
1868 }
1869
83321d6b 1870 pfk->dump.msg_version = hdr->sadb_msg_version;
15e47304 1871 pfk->dump.msg_portid = hdr->sadb_msg_pid;
83321d6b
TT		 1872 pfk->dump.dump = pfkey_dump_sa;
1873 pfk->dump.done = pfkey_dump_sa_done;
d3623099 1874 xfrm_state_walk_init(&pfk->dump.u.state, proto, filter);
89e357d8 1875 mutex_unlock(&pfk->dump_lock);
4c563f76 1876
83321d6b 1877 return pfkey_do_dump(pfk);
1da177e4
LT		 1878}
1879
4c93fbb0 1880static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1da177e4
LT		 1881{
1882 struct pfkey_sock *pfk = pfkey_sk(sk);
1883 int satype = hdr->sadb_msg_satype;
4c93fbb0 1884 bool reset_errno = false;
1da177e4
LT		 1885
1886 if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
4c93fbb0 1887 reset_errno = true;
1da177e4
LT		 1888 if (satype != 0 && satype != 1)
1889 return -EINVAL;
1890 pfk->promisc = satype;
1891 }
4c93fbb0
DM		 1892 if (reset_errno && skb_cloned(skb))
1893 skb = skb_copy(skb, GFP_KERNEL);
1894 else
1895 skb = skb_clone(skb, GFP_KERNEL);
1896
1897 if (reset_errno && skb) {
1898 struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data;
1899 new_hdr->sadb_msg_errno = 0;
1900 }
1901
36f41f8f 1902 pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk));
1da177e4
LT		 1903 return 0;
1904}
1905
1906static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1907{
1908 int i;
1909 u32 reqid = *(u32*)ptr;
1910
1911 for (i=0; i<xp->xfrm_nr; i++) {
1912 if (xp->xfrm_vec[i].reqid == reqid)
1913 return -EEXIST;
1914 }
1915 return 0;
1916}
1917
07fb0f17 1918static u32 gen_reqid(struct net *net)
1da177e4 1919{
4c563f76 1920 struct xfrm_policy_walk walk;
1da177e4 1921 u32 start;
4c563f76 1922 int rc;
1da177e4
LT		 1923 static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1924
1925 start = reqid;
1926 do {
1927 ++reqid;
1928 if (reqid == 0)
1929 reqid = IPSEC_MANUAL_REQID_MAX+1;
4c563f76 1930 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN);
07fb0f17 1931 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid);
283bc9f3 1932 xfrm_policy_walk_done(&walk, net);
4c563f76 1933 if (rc != -EEXIST)
1da177e4
LT		 1934 return reqid;
1935 } while (reqid != start);
1936 return 0;
1937}
1938
1939static int
1940parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
1941{
07fb0f17 1942 struct net *net = xp_net(xp);
1da177e4 1943 struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
55569ce2 1944 int mode;
1da177e4
LT		 1945
1946 if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1947 return -ELOOP;
1948
1949 if (rq->sadb_x_ipsecrequest_mode == 0)
1950 return -EINVAL;
dbb2483b
CW		 1951 if (!xfrm_id_proto_valid(rq->sadb_x_ipsecrequest_proto))
1952 return -EINVAL;
1da177e4 1953
dbb2483b 1954 t->id.proto = rq->sadb_x_ipsecrequest_proto;
55569ce2
KM		 1955 if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0)
1956 return -EINVAL;
1957 t->mode = mode;
1da177e4
LT		 1958 if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
1959 t->optional = 1;
1960 else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1961 t->reqid = rq->sadb_x_ipsecrequest_reqid;
1962 if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1963 t->reqid = 0;
07fb0f17 1964 if (!t->reqid && !(t->reqid = gen_reqid(net)))
1da177e4
LT		 1965 return -ENOBUFS;
1966 }
1967
1968 /* addresses present only in tunnel mode */
7e49e6de 1969 if (t->mode == XFRM_MODE_TUNNEL) {
096f41d3 1970 int err;
5f95ac91 1971
096f41d3
HX		 1972 err = parse_sockaddr_pair(
1973 (struct sockaddr *)(rq + 1),
1974 rq->sadb_x_ipsecrequest_len - sizeof(*rq),
1975 &t->saddr, &t->id.daddr, &t->encap_family);
1976 if (err)
1977 return err;
2718aa7c
MK		 1978 } else
1979 t->encap_family = xp->family;
1980
1da177e4 1981 /* No way to set this via kame pfkey */
c5d18e98 1982 t->allalgs = 1;
1da177e4
LT		 1983 xp->xfrm_nr++;
1984 return 0;
1985}
1986
1987static int
1988parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
1989{
1990 int err;
1991 int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
1992 struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
1993
f674e72f
DC		 1994 if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy))
1995 return -EINVAL;
1996
096f41d3
HX		 1997 while (len >= sizeof(*rq)) {
1998 if (len < rq->sadb_x_ipsecrequest_len ||
1999 rq->sadb_x_ipsecrequest_len < sizeof(*rq))
2000 return -EINVAL;
2001
1da177e4
LT		 2002 if ((err = parse_ipsecrequest(xp, rq)) < 0)
2003 return err;
2004 len -= rq->sadb_x_ipsecrequest_len;
2005 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
2006 }
2007 return 0;
2008}
2009
4c93fbb0 2010static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp)
df71837d 2011{
4fc735d9 2012 struct xfrm_sec_ctx *xfrm_ctx = xp->security;
df71837d
TJ		 2013
2014 if (xfrm_ctx) {
2015 int len = sizeof(struct sadb_x_sec_ctx);
2016 len += xfrm_ctx->ctx_len;
2017 return PFKEY_ALIGN8(len);
2018 }
2019 return 0;
2020}
2021
4c93fbb0 2022static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp)
1da177e4 2023{
4c93fbb0 2024 const struct xfrm_tmpl *t;
1da177e4 2025 int sockaddr_size = pfkey_sockaddr_size(xp->family);
2718aa7c
MK		 2026 int socklen = 0;
2027 int i;
2028
2029 for (i=0; i<xp->xfrm_nr; i++) {
2030 t = xp->xfrm_vec + i;
9e8b4ed8 2031 socklen += pfkey_sockaddr_len(t->encap_family);
2718aa7c 2032 }
1da177e4
LT		 2033
2034 return sizeof(struct sadb_msg) +
2035 (sizeof(struct sadb_lifetime) * 3) +
8ff24541 2036 (sizeof(struct sadb_address) * 2) +
1da177e4
LT		 2037 (sockaddr_size * 2) +
2038 sizeof(struct sadb_x_policy) +
2718aa7c
MK		 2039 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
2040 (socklen * 2) +
df71837d 2041 pfkey_xfrm_policy2sec_ctx_size(xp);
1da177e4
LT		 2042}
2043
4c93fbb0 2044static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp)
1da177e4
LT		 2045{
2046 struct sk_buff *skb;
2047 int size;
2048
2049 size = pfkey_xfrm_policy2msg_size(xp);
2050
2051 skb = alloc_skb(size + 16, GFP_ATOMIC);
2052 if (skb == NULL)
2053 return ERR_PTR(-ENOBUFS);
2054
2055 return skb;
2056}
2057
4c93fbb0 2058static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir)
1da177e4
LT		 2059{
2060 struct sadb_msg *hdr;
2061 struct sadb_address *addr;
2062 struct sadb_lifetime *lifetime;
2063 struct sadb_x_policy *pol;
df71837d
TJ		 2064 struct sadb_x_sec_ctx *sec_ctx;
2065 struct xfrm_sec_ctx *xfrm_ctx;
1da177e4
LT		 2066 int i;
2067 int size;
2068 int sockaddr_size = pfkey_sockaddr_size(xp->family);
9e8b4ed8 2069 int socklen = pfkey_sockaddr_len(xp->family);
1da177e4
LT		 2070
2071 size = pfkey_xfrm_policy2msg_size(xp);
2072
2073 /* call should fill header later */
4df864c1 2074 hdr = skb_put(skb, sizeof(struct sadb_msg));
1da177e4
LT		 2075 memset(hdr, 0, size); /* XXX do we need this ? */
2076
2077 /* src address */
4df864c1 2078 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
8ff24541 2079 addr->sadb_address_len =
1da177e4
LT		 2080 (sizeof(struct sadb_address)+sockaddr_size)/
2081 sizeof(uint64_t);
2082 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2083 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2084 addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
2085 addr->sadb_address_reserved = 0;
e5b56652
YH		 2086 if (!pfkey_sockaddr_fill(&xp->selector.saddr,
2087 xp->selector.sport,
2088 (struct sockaddr *) (addr + 1),
2089 xp->family))
1da177e4
LT		 2090 BUG();
2091
2092 /* dst address */
4df864c1 2093 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
1da177e4
LT		 2094 addr->sadb_address_len =
2095 (sizeof(struct sadb_address)+sockaddr_size)/
2096 sizeof(uint64_t);
2097 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2098 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
8ff24541 2099 addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
1da177e4 2100 addr->sadb_address_reserved = 0;
e5b56652
YH		 2101
2102 pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport,
2103 (struct sockaddr *) (addr + 1),
2104 xp->family);
1da177e4
LT		 2105
2106 /* hard time */
4df864c1 2107 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
1da177e4
LT		 2108 lifetime->sadb_lifetime_len =
2109 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2110 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2111 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.hard_packet_limit);
2112 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
2113 lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
2114 lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
2115 /* soft time */
4df864c1 2116 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
1da177e4
LT		 2117 lifetime->sadb_lifetime_len =
2118 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2119 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
2120 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.soft_packet_limit);
2121 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
2122 lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
2123 lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
2124 /* current time */
4df864c1 2125 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
1da177e4
LT		 2126 lifetime->sadb_lifetime_len =
2127 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2128 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2129 lifetime->sadb_lifetime_allocations = xp->curlft.packets;
2130 lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
2131 lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
2132 lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
2133
4df864c1 2134 pol = skb_put(skb, sizeof(struct sadb_x_policy));
1da177e4
LT		 2135 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2136 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2137 pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
2138 if (xp->action == XFRM_POLICY_ALLOW) {
2139 if (xp->xfrm_nr)
2140 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2141 else
2142 pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
2143 }
2144 pol->sadb_x_policy_dir = dir+1;
ff862a46 2145 pol->sadb_x_policy_reserved = 0;
1da177e4
LT		 2146 pol->sadb_x_policy_id = xp->index;
2147 pol->sadb_x_policy_priority = xp->priority;
2148
2149 for (i=0; i<xp->xfrm_nr; i++) {
4c93fbb0 2150 const struct xfrm_tmpl *t = xp->xfrm_vec + i;
1da177e4 2151 struct sadb_x_ipsecrequest *rq;
1da177e4 2152 int req_size;
55569ce2 2153 int mode;
1da177e4
LT		 2154
2155 req_size = sizeof(struct sadb_x_ipsecrequest);
e5b56652
YH		 2156 if (t->mode == XFRM_MODE_TUNNEL) {
2157 socklen = pfkey_sockaddr_len(t->encap_family);
2158 req_size += socklen * 2;
2159 } else {
1da177e4 2160 size -= 2*socklen;
e5b56652 2161 }
4df864c1 2162 rq = skb_put(skb, req_size);
1da177e4
LT		 2163 pol->sadb_x_policy_len += req_size/8;
2164 memset(rq, 0, sizeof(*rq));
2165 rq->sadb_x_ipsecrequest_len = req_size;
2166 rq->sadb_x_ipsecrequest_proto = t->id.proto;
55569ce2
KM		 2167 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0)
2168 return -EINVAL;
fefaa75e 2169 rq->sadb_x_ipsecrequest_mode = mode;
1da177e4
LT		 2170 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
2171 if (t->reqid)
2172 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2173 if (t->optional)
2174 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
2175 rq->sadb_x_ipsecrequest_reqid = t->reqid;
e5b56652 2176
7e49e6de 2177 if (t->mode == XFRM_MODE_TUNNEL) {
e5b56652
YH		 2178 u8 *sa = (void *)(rq + 1);
2179 pfkey_sockaddr_fill(&t->saddr, 0,
2180 (struct sockaddr *)sa,
2181 t->encap_family);
2182 pfkey_sockaddr_fill(&t->id.daddr, 0,
2183 (struct sockaddr *) (sa + socklen),
2184 t->encap_family);
1da177e4
LT		 2185 }
2186 }
df71837d
TJ		 2187
2188 /* security context */
2189 if ((xfrm_ctx = xp->security)) {
2190 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp);
2191
4df864c1 2192 sec_ctx = skb_put(skb, ctx_size);
df71837d
TJ		 2193 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t);
2194 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
2195 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
2196 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
2197 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
2198 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
2199 xfrm_ctx->ctx_len);
2200 }
2201
1da177e4 2202 hdr->sadb_msg_len = size / sizeof(uint64_t);
850a6212 2203 hdr->sadb_msg_reserved = refcount_read(&xp->refcnt);
55569ce2
KM		 2204
2205 return 0;
1da177e4
LT		 2206}
2207
214e005b 2208static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
26b15dad
JHS		 2209{
2210 struct sk_buff *out_skb;
2211 struct sadb_msg *out_hdr;
2212 int err;
2213
2214 out_skb = pfkey_xfrm_policy2msg_prep(xp);
9a127aad
DC		 2215 if (IS_ERR(out_skb))
2216 return PTR_ERR(out_skb);
2217
55569ce2 2218 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
1e532d2b
SK		 2219 if (err < 0) {
2220 kfree_skb(out_skb);
55569ce2 2221 return err;
1e532d2b 2222 }
26b15dad
JHS		 2223
2224 out_hdr = (struct sadb_msg *) out_skb->data;
2225 out_hdr->sadb_msg_version = PF_KEY_V2;
2226
f60f6b8f 2227 if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
26b15dad
JHS		 2228 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
2229 else
2230 out_hdr->sadb_msg_type = event2poltype(c->event);
2231 out_hdr->sadb_msg_errno = 0;
2232 out_hdr->sadb_msg_seq = c->seq;
15e47304 2233 out_hdr->sadb_msg_pid = c->portid;
36f41f8f 2234 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp));
26b15dad
JHS		 2235 return 0;
2236
2237}
2238
4c93fbb0 2239static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1da177e4 2240{
07fb0f17 2241 struct net *net = sock_net(sk);
df71837d 2242 int err = 0;
1da177e4
LT		 2243 struct sadb_lifetime *lifetime;
2244 struct sadb_address *sa;
2245 struct sadb_x_policy *pol;
2246 struct xfrm_policy *xp;
26b15dad 2247 struct km_event c;
df71837d 2248 struct sadb_x_sec_ctx *sec_ctx;
1da177e4
LT		 2249
2250 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2251 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2252 !ext_hdrs[SADB_X_EXT_POLICY-1])
2253 return -EINVAL;
2254
2255 pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2256 if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
2257 return -EINVAL;
2258 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2259 return -EINVAL;
2260
07fb0f17 2261 xp = xfrm_policy_alloc(net, GFP_KERNEL);
1da177e4
LT		 2262 if (xp == NULL)
2263 return -ENOBUFS;
2264
2265 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2266 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2267 xp->priority = pol->sadb_x_policy_priority;
2268
d0d79c3f 2269 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1da177e4 2270 xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
1da177e4
LT		 2271 xp->selector.family = xp->family;
2272 xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
2273 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2274 xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2275 if (xp->selector.sport)
8f83f23e 2276 xp->selector.sport_mask = htons(0xffff);
1da177e4 2277
d0d79c3f 2278 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1da177e4
LT		 2279 pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
2280 xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
2281
2282 /* Amusing, we set this twice. KAME apps appear to set same value
2283 * in both addresses.
2284 */
2285 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2286
2287 xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2288 if (xp->selector.dport)
8f83f23e 2289 xp->selector.dport_mask = htons(0xffff);
1da177e4 2290
ea110733 2291 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
df71837d 2292 if (sec_ctx != NULL) {
87536a81 2293 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
df71837d
TJ		 2294
2295 if (!uctx) {
2296 err = -ENOBUFS;
2297 goto out;
2298 }
2299
52a4c640 2300 err = security_xfrm_policy_alloc(&xp->security, uctx, GFP_KERNEL);
df71837d
TJ		 2301 kfree(uctx);
2302
2303 if (err)
2304 goto out;
2305 }
2306
1da177e4
LT		 2307 xp->lft.soft_byte_limit = XFRM_INF;
2308 xp->lft.hard_byte_limit = XFRM_INF;
2309 xp->lft.soft_packet_limit = XFRM_INF;
2310 xp->lft.hard_packet_limit = XFRM_INF;
2311 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
2312 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2313 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2314 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2315 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2316 }
2317 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
2318 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2319 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2320 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2321 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2322 }
2323 xp->xfrm_nr = 0;
2324 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2325 (err = parse_ipsecrequests(xp, pol)) < 0)
2326 goto out;
2327
1da177e4
LT		 2328 err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
2329 hdr->sadb_msg_type != SADB_X_SPDUPDATE);
df71837d 2330
2e71029e 2331 xfrm_audit_policy_add(xp, err ? 0 : 1, true);
161a09e7 2332
df71837d
TJ		 2333 if (err)
2334 goto out;
1da177e4 2335
26b15dad 2336 if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
f60f6b8f 2337 c.event = XFRM_MSG_UPDPOLICY;
8ff24541 2338 else
f60f6b8f 2339 c.event = XFRM_MSG_NEWPOLICY;
1da177e4 2340
26b15dad 2341 c.seq = hdr->sadb_msg_seq;
15e47304 2342 c.portid = hdr->sadb_msg_pid;
1da177e4 2343
26b15dad
JHS		 2344 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2345 xfrm_pol_put(xp);
1da177e4
LT		 2346 return 0;
2347
2348out:
12a169e7 2349 xp->walk.dead = 1;
64c31b3f 2350 xfrm_policy_destroy(xp);
1da177e4
LT		 2351 return err;
2352}
2353
4c93fbb0 2354static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1da177e4 2355{
07fb0f17 2356 struct net *net = sock_net(sk);
1da177e4
LT		 2357 int err;
2358 struct sadb_address *sa;
2359 struct sadb_x_policy *pol;
03e1ad7b 2360 struct xfrm_policy *xp;
1da177e4 2361 struct xfrm_selector sel;
26b15dad 2362 struct km_event c;
df71837d 2363 struct sadb_x_sec_ctx *sec_ctx;
2db3e47e 2364 struct xfrm_sec_ctx *pol_ctx = NULL;
1da177e4
LT		 2365
2366 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2367 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2368 !ext_hdrs[SADB_X_EXT_POLICY-1])
2369 return -EINVAL;
2370
2371 pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2372 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2373 return -EINVAL;
2374
2375 memset(&sel, 0, sizeof(sel));
2376
d0d79c3f 2377 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1da177e4
LT		 2378 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2379 sel.prefixlen_s = sa->sadb_address_prefixlen;
2380 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2381 sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2382 if (sel.sport)
8f83f23e 2383 sel.sport_mask = htons(0xffff);
1da177e4 2384
d0d79c3f 2385 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1da177e4
LT		 2386 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2387 sel.prefixlen_d = sa->sadb_address_prefixlen;
2388 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2389 sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2390 if (sel.dport)
8f83f23e 2391 sel.dport_mask = htons(0xffff);
1da177e4 2392
ea110733 2393 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
df71837d 2394 if (sec_ctx != NULL) {
87536a81 2395 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
df71837d
TJ		 2396
2397 if (!uctx)
2398 return -ENOMEM;
2399
52a4c640 2400 err = security_xfrm_policy_alloc(&pol_ctx, uctx, GFP_KERNEL);
df71837d 2401 kfree(uctx);
df71837d
TJ		 2402 if (err)
2403 return err;
2db3e47e 2404 }
161a09e7 2405
4f47e8ab 2406 xp = xfrm_policy_bysel_ctx(net, &dummy_mark, 0, XFRM_POLICY_TYPE_MAIN,
03e1ad7b
PM		 2407 pol->sadb_x_policy_dir - 1, &sel, pol_ctx,
2408 1, &err);
2409 security_xfrm_policy_free(pol_ctx);
1da177e4
LT		 2410 if (xp == NULL)
2411 return -ENOENT;
2412
2e71029e 2413 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
13fcfbb0
DM		 2414
2415 if (err)
c8c05a8e 2416 goto out;
13fcfbb0 2417
26b15dad 2418 c.seq = hdr->sadb_msg_seq;
15e47304 2419 c.portid = hdr->sadb_msg_pid;
1839faab 2420 c.data.byid = 0;
f60f6b8f 2421 c.event = XFRM_MSG_DELPOLICY;
26b15dad
JHS		 2422 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2423
c8c05a8e 2424out:
26b15dad
JHS		 2425 xfrm_pol_put(xp);
2426 return err;
2427}
2428
4c93fbb0 2429static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir)
26b15dad
JHS		 2430{
2431 int err;
2432 struct sk_buff *out_skb;
2433 struct sadb_msg *out_hdr;
2434 err = 0;
2435
1da177e4
LT		 2436 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2437 if (IS_ERR(out_skb)) {
2438 err = PTR_ERR(out_skb);
2439 goto out;
2440 }
55569ce2 2441 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
7c80eb1c
JS		 2442 if (err < 0) {
2443 kfree_skb(out_skb);
55569ce2 2444 goto out;
7c80eb1c 2445 }
1da177e4
LT		 2446
2447 out_hdr = (struct sadb_msg *) out_skb->data;
2448 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
26b15dad 2449 out_hdr->sadb_msg_type = hdr->sadb_msg_type;
1da177e4
LT		 2450 out_hdr->sadb_msg_satype = 0;
2451 out_hdr->sadb_msg_errno = 0;
2452 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2453 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
36f41f8f 2454 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp));
1da177e4
LT		 2455 err = 0;
2456
2457out:
1da177e4
LT		 2458 return err;
2459}
2460
08de61be
SS		 2461static int pfkey_sockaddr_pair_size(sa_family_t family)
2462{
9e8b4ed8 2463 return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
08de61be
SS		 2464}
2465
13c1d189 2466static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
08de61be
SS		 2467 xfrm_address_t *saddr, xfrm_address_t *daddr,
2468 u16 *family)
2469{
5f95ac91
YH		 2470 int af, socklen;
2471
096f41d3 2472 if (ext_len < 2 || ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
08de61be
SS		 2473 return -EINVAL;
2474
13c1d189 2475 af = pfkey_sockaddr_extract(sa, saddr);
5f95ac91
YH		 2476 if (!af)
2477 return -EINVAL;
2478
2479 socklen = pfkey_sockaddr_len(af);
13c1d189 2480 if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen),
5f95ac91 2481 daddr) != af)
08de61be 2482 return -EINVAL;
08de61be 2483
5f95ac91 2484 *family = af;
08de61be
SS		 2485 return 0;
2486}
2487
096f41d3 2488#ifdef CONFIG_NET_KEY_MIGRATE
08de61be
SS		 2489static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
2490 struct xfrm_migrate *m)
2491{
2492 int err;
2493 struct sadb_x_ipsecrequest *rq2;
55569ce2 2494 int mode;
08de61be 2495
096f41d3
HX		 2496 if (len < sizeof(*rq1) ||
2497 len < rq1->sadb_x_ipsecrequest_len ||
2498 rq1->sadb_x_ipsecrequest_len < sizeof(*rq1))
08de61be
SS		 2499 return -EINVAL;
2500
2501 /* old endoints */
13c1d189 2502 err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
096f41d3 2503 rq1->sadb_x_ipsecrequest_len - sizeof(*rq1),
13c1d189 2504 &m->old_saddr, &m->old_daddr,
08de61be
SS		 2505 &m->old_family);
2506 if (err)
2507 return err;
2508
2509 rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len);
2510 len -= rq1->sadb_x_ipsecrequest_len;
2511
096f41d3
HX		 2512 if (len <= sizeof(*rq2) ||
2513 len < rq2->sadb_x_ipsecrequest_len ||
2514 rq2->sadb_x_ipsecrequest_len < sizeof(*rq2))
08de61be
SS		 2515 return -EINVAL;
2516
2517 /* new endpoints */
13c1d189 2518 err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
096f41d3 2519 rq2->sadb_x_ipsecrequest_len - sizeof(*rq2),
13c1d189 2520 &m->new_saddr, &m->new_daddr,
08de61be
SS		 2521 &m->new_family);
2522 if (err)
2523 return err;
2524
2525 if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto ||
2526 rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode ||
2527 rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid)
2528 return -EINVAL;
2529
2530 m->proto = rq1->sadb_x_ipsecrequest_proto;
55569ce2
KM		 2531 if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
2532 return -EINVAL;
2533 m->mode = mode;
08de61be
SS		 2534 m->reqid = rq1->sadb_x_ipsecrequest_reqid;
2535
2536 return ((int)(rq1->sadb_x_ipsecrequest_len +
2537 rq2->sadb_x_ipsecrequest_len));
2538}
2539
2540static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
4c93fbb0 2541 const struct sadb_msg *hdr, void * const *ext_hdrs)
08de61be
SS		 2542{
2543 int i, len, ret, err = -EINVAL;
2544 u8 dir;
2545 struct sadb_address *sa;
13c1d189 2546 struct sadb_x_kmaddress *kma;
08de61be
SS		 2547 struct sadb_x_policy *pol;
2548 struct sadb_x_ipsecrequest *rq;
2549 struct xfrm_selector sel;
2550 struct xfrm_migrate m[XFRM_MAX_DEPTH];
13c1d189 2551 struct xfrm_kmaddress k;
8d549c4f 2552 struct net *net = sock_net(sk);
08de61be
SS		 2553
2554 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
13c1d189 2555 ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
08de61be
SS		 2556 !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
2557 err = -EINVAL;
2558 goto out;
2559 }
2560
13c1d189 2561 kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1];
08de61be 2562 pol = ext_hdrs[SADB_X_EXT_POLICY - 1];
08de61be
SS		 2563
2564 if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) {
2565 err = -EINVAL;
2566 goto out;
2567 }
2568
13c1d189
AE		 2569 if (kma) {
2570 /* convert sadb_x_kmaddress to xfrm_kmaddress */
2571 k.reserved = kma->sadb_x_kmaddress_reserved;
2572 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1),
2573 8*(kma->sadb_x_kmaddress_len) - sizeof(*kma),
2574 &k.local, &k.remote, &k.family);
2575 if (ret < 0) {
2576 err = ret;
2577 goto out;
2578 }
2579 }
2580
08de61be
SS		 2581 dir = pol->sadb_x_policy_dir - 1;
2582 memset(&sel, 0, sizeof(sel));
2583
2584 /* set source address info of selector */
2585 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1];
2586 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2587 sel.prefixlen_s = sa->sadb_address_prefixlen;
2588 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2589 sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2590 if (sel.sport)
582ee43d 2591 sel.sport_mask = htons(0xffff);
08de61be
SS		 2592
2593 /* set destination address info of selector */
47162c0b 2594 sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
08de61be
SS		 2595 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2596 sel.prefixlen_d = sa->sadb_address_prefixlen;
2597 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2598 sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2599 if (sel.dport)
582ee43d 2600 sel.dport_mask = htons(0xffff);
08de61be
SS		 2601
2602 rq = (struct sadb_x_ipsecrequest *)(pol + 1);
2603
2604 /* extract ipsecrequests */
2605 i = 0;
2606 len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy);
2607
2608 while (len > 0 && i < XFRM_MAX_DEPTH) {
2609 ret = ipsecrequests_to_migrate(rq, len, &m[i]);
2610 if (ret < 0) {
2611 err = ret;
2612 goto out;
2613 } else {
2614 rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret);
2615 len -= ret;
2616 i++;
2617 }
2618 }
2619
2620 if (!i || len > 0) {
2621 err = -EINVAL;
2622 goto out;
2623 }
2624
13c1d189 2625 return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
c1aca308 2626 kma ? &k : NULL, net, NULL, 0);
08de61be
SS		 2627
2628 out:
2629 return err;
2630}
2631#else
2632static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
7f6daa63 2633 const struct sadb_msg *hdr, void * const *ext_hdrs)
08de61be
SS		 2634{
2635 return -ENOPROTOOPT;
2636}
2637#endif
2638
2639
4c93fbb0 2640static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1da177e4 2641{
07fb0f17 2642 struct net *net = sock_net(sk);
77d8d7a6 2643 unsigned int dir;
215a2dd3 2644 int err = 0, delete;
1da177e4
LT		 2645 struct sadb_x_policy *pol;
2646 struct xfrm_policy *xp;
26b15dad 2647 struct km_event c;
1da177e4
LT		 2648
2649 if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2650 return -EINVAL;
2651
77d8d7a6
HX		 2652 dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
2653 if (dir >= XFRM_POLICY_MAX)
2654 return -EINVAL;
2655
215a2dd3 2656 delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
4f47e8ab 2657 xp = xfrm_policy_byid(net, &dummy_mark, 0, XFRM_POLICY_TYPE_MAIN,
bd55775c 2658 dir, pol->sadb_x_policy_id, delete, &err);
1da177e4
LT		 2659 if (xp == NULL)
2660 return -ENOENT;
2661
215a2dd3 2662 if (delete) {
2e71029e 2663 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
1da177e4 2664
215a2dd3
EP		 2665 if (err)
2666 goto out;
2667 c.seq = hdr->sadb_msg_seq;
15e47304 2668 c.portid = hdr->sadb_msg_pid;
bf08867f 2669 c.data.byid = 1;
f60f6b8f 2670 c.event = XFRM_MSG_DELPOLICY;
77d8d7a6 2671 km_policy_notify(xp, dir, &c);
26b15dad 2672 } else {
77d8d7a6 2673 err = key_pol_get_resp(sk, xp, hdr, dir);
1da177e4 2674 }
1da177e4 2675
215a2dd3 2676out:
1da177e4
LT		 2677 xfrm_pol_put(xp);
2678 return err;
2679}
2680
2681static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2682{
83321d6b 2683 struct pfkey_sock *pfk = ptr;
1da177e4
LT		 2684 struct sk_buff *out_skb;
2685 struct sadb_msg *out_hdr;
55569ce2 2686 int err;
1da177e4 2687
83321d6b
TT		 2688 if (!pfkey_can_dump(&pfk->sk))
2689 return -ENOBUFS;
2690
1da177e4
LT		 2691 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2692 if (IS_ERR(out_skb))
2693 return PTR_ERR(out_skb);
2694
55569ce2 2695 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
7c80eb1c
JS		 2696 if (err < 0) {
2697 kfree_skb(out_skb);
55569ce2 2698 return err;
7c80eb1c 2699 }
1da177e4
LT		 2700
2701 out_hdr = (struct sadb_msg *) out_skb->data;
83321d6b 2702 out_hdr->sadb_msg_version = pfk->dump.msg_version;
1da177e4
LT		 2703 out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2704 out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2705 out_hdr->sadb_msg_errno = 0;
12a169e7 2706 out_hdr->sadb_msg_seq = count + 1;
15e47304 2707 out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
12a169e7
HX		 2708
2709 if (pfk->dump.skb)
36f41f8f 2710 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
07fb0f17 2711 &pfk->sk, sock_net(&pfk->sk));
12a169e7
HX		 2712 pfk->dump.skb = out_skb;
2713
1da177e4
LT		 2714 return 0;
2715}
2716
83321d6b
TT		 2717static int pfkey_dump_sp(struct pfkey_sock *pfk)
2718{
07fb0f17
AD		 2719 struct net *net = sock_net(&pfk->sk);
2720 return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk);
83321d6b
TT		 2721}
2722
2723static void pfkey_dump_sp_done(struct pfkey_sock *pfk)
2724{
283bc9f3
FD		 2725 struct net *net = sock_net((struct sock *)pfk);
2726
2727 xfrm_policy_walk_done(&pfk->dump.u.policy, net);
83321d6b
TT		 2728}
2729
4c93fbb0 2730static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1da177e4 2731{
83321d6b 2732 struct pfkey_sock *pfk = pfkey_sk(sk);
4c563f76 2733
89e357d8
YS		 2734 mutex_lock(&pfk->dump_lock);
2735 if (pfk->dump.dump != NULL) {
2736 mutex_unlock(&pfk->dump_lock);
83321d6b 2737 return -EBUSY;
89e357d8 2738 }
1da177e4 2739
83321d6b 2740 pfk->dump.msg_version = hdr->sadb_msg_version;
15e47304 2741 pfk->dump.msg_portid = hdr->sadb_msg_pid;
83321d6b
TT		 2742 pfk->dump.dump = pfkey_dump_sp;
2743 pfk->dump.done = pfkey_dump_sp_done;
2744 xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN);
89e357d8 2745 mutex_unlock(&pfk->dump_lock);
83321d6b
TT		 2746
2747 return pfkey_do_dump(pfk);
1da177e4
LT		 2748}
2749
214e005b 2750static int key_notify_policy_flush(const struct km_event *c)
1da177e4
LT		 2751{
2752 struct sk_buff *skb_out;
26b15dad 2753 struct sadb_msg *hdr;
1da177e4 2754
26b15dad 2755 skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1da177e4
LT		 2756 if (!skb_out)
2757 return -ENOBUFS;
4df864c1 2758 hdr = skb_put(skb_out, sizeof(struct sadb_msg));
151bb0ff 2759 hdr->sadb_msg_type = SADB_X_SPDFLUSH;
26b15dad 2760 hdr->sadb_msg_seq = c->seq;
15e47304 2761 hdr->sadb_msg_pid = c->portid;
26b15dad
JHS		 2762 hdr->sadb_msg_version = PF_KEY_V2;
2763 hdr->sadb_msg_errno = (uint8_t) 0;
85dfb745 2764 hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
26b15dad 2765 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
a5cc68f3 2766 hdr->sadb_msg_reserved = 0;
36f41f8f 2767 pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
26b15dad 2768 return 0;
1da177e4 2769
26b15dad
JHS		 2770}
2771
4c93fbb0 2772static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
26b15dad 2773{
07fb0f17 2774 struct net *net = sock_net(sk);
26b15dad 2775 struct km_event c;
8be987d7 2776 int err, err2;
1da177e4 2777
2e71029e 2778 err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, true);
8be987d7 2779 err2 = unicast_flush_resp(sk, hdr);
2f1eb65f
JHS		 2780 if (err || err2) {
2781 if (err == -ESRCH) /* empty table - old silent behavior */
2782 return 0;
2783 return err;
2784 }
8be987d7 2785
f7b6983f 2786 c.data.type = XFRM_POLICY_TYPE_MAIN;
f60f6b8f 2787 c.event = XFRM_MSG_FLUSHPOLICY;
15e47304 2788 c.portid = hdr->sadb_msg_pid;
26b15dad 2789 c.seq = hdr->sadb_msg_seq;
07fb0f17 2790 c.net = net;
26b15dad 2791 km_policy_notify(NULL, 0, &c);
1da177e4
LT		 2792
2793 return 0;
2794}
2795
2796typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
4c93fbb0 2797 const struct sadb_msg *hdr, void * const *ext_hdrs);
8603b955 2798static const pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
1da177e4
LT		 2799 [SADB_RESERVED] = pfkey_reserved,
2800 [SADB_GETSPI] = pfkey_getspi,
2801 [SADB_UPDATE] = pfkey_add,
2802 [SADB_ADD] = pfkey_add,
2803 [SADB_DELETE] = pfkey_delete,
2804 [SADB_GET] = pfkey_get,
2805 [SADB_ACQUIRE] = pfkey_acquire,
2806 [SADB_REGISTER] = pfkey_register,
2807 [SADB_EXPIRE] = NULL,
2808 [SADB_FLUSH] = pfkey_flush,
2809 [SADB_DUMP] = pfkey_dump,
2810 [SADB_X_PROMISC] = pfkey_promisc,
2811 [SADB_X_PCHANGE] = NULL,
2812 [SADB_X_SPDUPDATE] = pfkey_spdadd,
2813 [SADB_X_SPDADD] = pfkey_spdadd,
2814 [SADB_X_SPDDELETE] = pfkey_spddelete,
2815 [SADB_X_SPDGET] = pfkey_spdget,
2816 [SADB_X_SPDACQUIRE] = NULL,
2817 [SADB_X_SPDDUMP] = pfkey_spddump,
2818 [SADB_X_SPDFLUSH] = pfkey_spdflush,
2819 [SADB_X_SPDSETIDX] = pfkey_spdadd,
2820 [SADB_X_SPDDELETE2] = pfkey_spdget,
08de61be 2821 [SADB_X_MIGRATE] = pfkey_migrate,
1da177e4
LT		 2822};
2823
4c93fbb0 2824static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr)
1da177e4
LT		 2825{
2826 void *ext_hdrs[SADB_EXT_MAX];
2827 int err;
2828
4dc2a5a8
JJ		 2829 err = pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
2830 BROADCAST_PROMISC_ONLY, NULL, sock_net(sk));
2831 if (err)
2832 return err;
1da177e4
LT		 2833
2834 memset(ext_hdrs, 0, sizeof(ext_hdrs));
2835 err = parse_exthdrs(skb, hdr, ext_hdrs);
2836 if (!err) {
2837 err = -EOPNOTSUPP;
2838 if (pfkey_funcs[hdr->sadb_msg_type])
2839 err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2840 }
2841 return err;
2842}
2843
2844static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2845{
2846 struct sadb_msg *hdr = NULL;
2847
2848 if (skb->len < sizeof(*hdr)) {
2849 *errp = -EMSGSIZE;
2850 } else {
2851 hdr = (struct sadb_msg *) skb->data;
2852 if (hdr->sadb_msg_version != PF_KEY_V2 ||
2853 hdr->sadb_msg_reserved != 0 ||
2854 (hdr->sadb_msg_type <= SADB_RESERVED ||
2855 hdr->sadb_msg_type > SADB_MAX)) {
2856 hdr = NULL;
2857 *errp = -EINVAL;
2858 } else if (hdr->sadb_msg_len != (skb->len /
2859 sizeof(uint64_t)) ||
2860 hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2861 sizeof(uint64_t))) {
2862 hdr = NULL;
2863 *errp = -EMSGSIZE;
2864 } else {
2865 *errp = 0;
2866 }
2867 }
2868 return hdr;
2869}
2870
4c93fbb0
DM		 2871static inline int aalg_tmpl_set(const struct xfrm_tmpl *t,
2872 const struct xfrm_algo_desc *d)
1da177e4 2873{
f398035f
HX		 2874 unsigned int id = d->desc.sadb_alg_id;
2875
2876 if (id >= sizeof(t->aalgos) * 8)
2877 return 0;
2878
2879 return (t->aalgos >> id) & 1;
1da177e4
LT		 2880}
2881
4c93fbb0
DM		 2882static inline int ealg_tmpl_set(const struct xfrm_tmpl *t,
2883 const struct xfrm_algo_desc *d)
1da177e4 2884{
f398035f
HX		 2885 unsigned int id = d->desc.sadb_alg_id;
2886
2887 if (id >= sizeof(t->ealgos) * 8)
2888 return 0;
2889
2890 return (t->ealgos >> id) & 1;
1da177e4
LT		 2891}
2892
4c93fbb0 2893static int count_ah_combs(const struct xfrm_tmpl *t)
1da177e4
LT		 2894{
2895 int i, sz = 0;
2896
2897 for (i = 0; ; i++) {
4c93fbb0 2898 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1da177e4
LT		 2899 if (!aalg)
2900 break;
7e50f84c
JK		 2901 if (!aalg->pfkey_supported)
2902 continue;
015c44d7 2903 if (aalg_tmpl_set(t, aalg) && aalg->available)
1da177e4
LT		 2904 sz += sizeof(struct sadb_comb);
2905 }
2906 return sz + sizeof(struct sadb_prop);
2907}
2908
4c93fbb0 2909static int count_esp_combs(const struct xfrm_tmpl *t)
1da177e4
LT		 2910{
2911 int i, k, sz = 0;
2912
2913 for (i = 0; ; i++) {
4c93fbb0 2914 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1da177e4
LT		 2915 if (!ealg)
2916 break;
8ff24541 2917
7e50f84c
JK		 2918 if (!ealg->pfkey_supported)
2919 continue;
2920
015c44d7 2921 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
1da177e4 2922 continue;
8ff24541 2923
1da177e4 2924 for (k = 1; ; k++) {
4c93fbb0 2925 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
1da177e4
LT		 2926 if (!aalg)
2927 break;
8ff24541 2928
7e50f84c
JK		 2929 if (!aalg->pfkey_supported)
2930 continue;
2931
015c44d7 2932 if (aalg_tmpl_set(t, aalg) && aalg->available)
1da177e4
LT		 2933 sz += sizeof(struct sadb_comb);
2934 }
2935 }
2936 return sz + sizeof(struct sadb_prop);
2937}
2938
4c93fbb0 2939static void dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
1da177e4
LT		 2940{
2941 struct sadb_prop *p;
2942 int i;
2943
4df864c1 2944 p = skb_put(skb, sizeof(struct sadb_prop));
1da177e4
LT		 2945 p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2946 p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2947 p->sadb_prop_replay = 32;
2948 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2949
2950 for (i = 0; ; i++) {
4c93fbb0 2951 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1da177e4
LT		 2952 if (!aalg)
2953 break;
2954
7e50f84c
JK		 2955 if (!aalg->pfkey_supported)
2956 continue;
2957
1da177e4
LT		 2958 if (aalg_tmpl_set(t, aalg) && aalg->available) {
2959 struct sadb_comb *c;
b080db58 2960 c = skb_put_zero(skb, sizeof(struct sadb_comb));
1da177e4
LT		 2961 p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2962 c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2963 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2964 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2965 c->sadb_comb_hard_addtime = 24*60*60;
2966 c->sadb_comb_soft_addtime = 20*60*60;
2967 c->sadb_comb_hard_usetime = 8*60*60;
2968 c->sadb_comb_soft_usetime = 7*60*60;
2969 }
2970 }
2971}
2972
4c93fbb0 2973static void dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
1da177e4
LT		 2974{
2975 struct sadb_prop *p;
2976 int i, k;
2977
4df864c1 2978 p = skb_put(skb, sizeof(struct sadb_prop));
1da177e4
LT		 2979 p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2980 p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2981 p->sadb_prop_replay = 32;
2982 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2983
2984 for (i=0; ; i++) {
4c93fbb0 2985 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1da177e4
LT		 2986 if (!ealg)
2987 break;
8ff24541 2988
7e50f84c
JK		 2989 if (!ealg->pfkey_supported)
2990 continue;
2991
1da177e4
LT		 2992 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2993 continue;
8ff24541 2994
1da177e4
LT		 2995 for (k = 1; ; k++) {
2996 struct sadb_comb *c;
4c93fbb0 2997 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
1da177e4
LT		 2998 if (!aalg)
2999 break;
7e50f84c
JK		 3000 if (!aalg->pfkey_supported)
3001 continue;
1da177e4
LT		 3002 if (!(aalg_tmpl_set(t, aalg) && aalg->available))
3003 continue;
4df864c1 3004 c = skb_put(skb, sizeof(struct sadb_comb));
1da177e4
LT		 3005 memset(c, 0, sizeof(*c));
3006 p->sadb_prop_len += sizeof(struct sadb_comb)/8;
3007 c->sadb_comb_auth = aalg->desc.sadb_alg_id;
3008 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
3009 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
3010 c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
3011 c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
3012 c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
3013 c->sadb_comb_hard_addtime = 24*60*60;
3014 c->sadb_comb_soft_addtime = 20*60*60;
3015 c->sadb_comb_hard_usetime = 8*60*60;
3016 c->sadb_comb_soft_usetime = 7*60*60;
3017 }
3018 }
3019}
3020
214e005b 3021static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c)
26b15dad
JHS		 3022{
3023 return 0;
3024}
3025
214e005b 3026static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c)
1da177e4
LT		 3027{
3028 struct sk_buff *out_skb;
3029 struct sadb_msg *out_hdr;
26b15dad
JHS		 3030 int hard;
3031 int hsc;
3032
bf08867f 3033 hard = c->data.hard;
26b15dad
JHS		 3034 if (hard)
3035 hsc = 2;
3036 else
3037 hsc = 1;
1da177e4 3038
050f009e 3039 out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
1da177e4
LT		 3040 if (IS_ERR(out_skb))
3041 return PTR_ERR(out_skb);
3042
3043 out_hdr = (struct sadb_msg *) out_skb->data;
3044 out_hdr->sadb_msg_version = PF_KEY_V2;
3045 out_hdr->sadb_msg_type = SADB_EXPIRE;
3046 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3047 out_hdr->sadb_msg_errno = 0;
3048 out_hdr->sadb_msg_reserved = 0;
3049 out_hdr->sadb_msg_seq = 0;
3050 out_hdr->sadb_msg_pid = 0;
3051
36f41f8f
ED		 3052 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3053 xs_net(x));
1da177e4
LT		 3054 return 0;
3055}
3056
214e005b 3057static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c)
26b15dad 3058{
07fb0f17 3059 struct net *net = x ? xs_net(x) : c->net;
3fa87a32
AD		 3060 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3061
3062 if (atomic_read(&net_pfkey->socks_nr) == 0)
99c6f60e
JHS		 3063 return 0;
3064
26b15dad 3065 switch (c->event) {
f60f6b8f 3066 case XFRM_MSG_EXPIRE:
26b15dad 3067 return key_notify_sa_expire(x, c);
f60f6b8f
HX		 3068 case XFRM_MSG_DELSA:
3069 case XFRM_MSG_NEWSA:
3070 case XFRM_MSG_UPDSA:
26b15dad 3071 return key_notify_sa(x, c);
f60f6b8f 3072 case XFRM_MSG_FLUSHSA:
26b15dad 3073 return key_notify_sa_flush(c);
d51d081d
JHS		 3074 case XFRM_MSG_NEWAE: /* not yet supported */
3075 break;
26b15dad 3076 default:
207024b9 3077 pr_err("pfkey: Unknown SA event %d\n", c->event);
26b15dad
JHS		 3078 break;
3079 }
3080
3081 return 0;
3082}
3083
214e005b 3084static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
26b15dad 3085{
f7b6983f
MN		 3086 if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
3087 return 0;
3088
26b15dad 3089 switch (c->event) {
f60f6b8f 3090 case XFRM_MSG_POLEXPIRE:
26b15dad 3091 return key_notify_policy_expire(xp, c);
f60f6b8f
HX		 3092 case XFRM_MSG_DELPOLICY:
3093 case XFRM_MSG_NEWPOLICY:
3094 case XFRM_MSG_UPDPOLICY:
26b15dad 3095 return key_notify_policy(xp, dir, c);
f60f6b8f 3096 case XFRM_MSG_FLUSHPOLICY:
f7b6983f
MN		 3097 if (c->data.type != XFRM_POLICY_TYPE_MAIN)
3098 break;
26b15dad
JHS		 3099 return key_notify_policy_flush(c);
3100 default:
207024b9 3101 pr_err("pfkey: Unknown policy event %d\n", c->event);
26b15dad
JHS		 3102 break;
3103 }
3104
3105 return 0;
3106}
3107
1da177e4
LT		 3108static u32 get_acqseq(void)
3109{
3110 u32 res;
28aecb9d 3111 static atomic_t acqseq;
1da177e4 3112
28aecb9d
ED		 3113 do {
3114 res = atomic_inc_return(&acqseq);
3115 } while (!res);
1da177e4
LT		 3116 return res;
3117}
3118
0f24558e
HG		 3119static bool pfkey_is_alive(const struct km_event *c)
3120{
3121 struct netns_pfkey *net_pfkey = net_generic(c->net, pfkey_net_id);
3122 struct sock *sk;
3123 bool is_alive = false;
3124
3125 rcu_read_lock();
3126 sk_for_each_rcu(sk, &net_pfkey->table) {
3127 if (pfkey_sk(sk)->registered) {
3128 is_alive = true;
3129 break;
3130 }
3131 }
3132 rcu_read_unlock();
3133
3134 return is_alive;
3135}
3136
65e0736b 3137static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp)
1da177e4
LT		 3138{
3139 struct sk_buff *skb;
3140 struct sadb_msg *hdr;
3141 struct sadb_address *addr;
3142 struct sadb_x_policy *pol;
1da177e4
LT		 3143 int sockaddr_size;
3144 int size;
4e2ba18e
VY		 3145 struct sadb_x_sec_ctx *sec_ctx;
3146 struct xfrm_sec_ctx *xfrm_ctx;
3147 int ctx_size = 0;
8ff24541 3148
1da177e4
LT		 3149 sockaddr_size = pfkey_sockaddr_size(x->props.family);
3150 if (!sockaddr_size)
3151 return -EINVAL;
3152
3153 size = sizeof(struct sadb_msg) +
3154 (sizeof(struct sadb_address) * 2) +
3155 (sockaddr_size * 2) +
3156 sizeof(struct sadb_x_policy);
8ff24541 3157
1da177e4
LT		 3158 if (x->id.proto == IPPROTO_AH)
3159 size += count_ah_combs(t);
3160 else if (x->id.proto == IPPROTO_ESP)
3161 size += count_esp_combs(t);
3162
4e2ba18e
VY		 3163 if ((xfrm_ctx = x->security)) {
3164 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
3165 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
3166 }
3167
1da177e4
LT		 3168 skb = alloc_skb(size + 16, GFP_ATOMIC);
3169 if (skb == NULL)
3170 return -ENOMEM;
8ff24541 3171
4df864c1 3172 hdr = skb_put(skb, sizeof(struct sadb_msg));
1da177e4
LT		 3173 hdr->sadb_msg_version = PF_KEY_V2;
3174 hdr->sadb_msg_type = SADB_ACQUIRE;
3175 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3176 hdr->sadb_msg_len = size / sizeof(uint64_t);
3177 hdr->sadb_msg_errno = 0;
3178 hdr->sadb_msg_reserved = 0;
3179 hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3180 hdr->sadb_msg_pid = 0;
3181
3182 /* src address */
4df864c1 3183 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
8ff24541 3184 addr->sadb_address_len =
1da177e4
LT		 3185 (sizeof(struct sadb_address)+sockaddr_size)/
3186 sizeof(uint64_t);
3187 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3188 addr->sadb_address_proto = 0;
3189 addr->sadb_address_reserved = 0;
e5b56652
YH		 3190 addr->sadb_address_prefixlen =
3191 pfkey_sockaddr_fill(&x->props.saddr, 0,
3192 (struct sockaddr *) (addr + 1),
3193 x->props.family);
3194 if (!addr->sadb_address_prefixlen)
1da177e4 3195 BUG();
8ff24541 3196
1da177e4 3197 /* dst address */
4df864c1 3198 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
1da177e4
LT		 3199 addr->sadb_address_len =
3200 (sizeof(struct sadb_address)+sockaddr_size)/
3201 sizeof(uint64_t);
3202 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3203 addr->sadb_address_proto = 0;
3204 addr->sadb_address_reserved = 0;
e5b56652
YH		 3205 addr->sadb_address_prefixlen =
3206 pfkey_sockaddr_fill(&x->id.daddr, 0,
3207 (struct sockaddr *) (addr + 1),
3208 x->props.family);
3209 if (!addr->sadb_address_prefixlen)
1da177e4
LT		 3210 BUG();
3211
4df864c1 3212 pol = skb_put(skb, sizeof(struct sadb_x_policy));
1da177e4
LT		 3213 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
3214 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3215 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
65e0736b 3216 pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1;
ff862a46 3217 pol->sadb_x_policy_reserved = 0;
1da177e4 3218 pol->sadb_x_policy_id = xp->index;
ff862a46 3219 pol->sadb_x_policy_priority = xp->priority;
1da177e4
LT		 3220
3221 /* Set sadb_comb's. */
3222 if (x->id.proto == IPPROTO_AH)
3223 dump_ah_combs(skb, t);
3224 else if (x->id.proto == IPPROTO_ESP)
3225 dump_esp_combs(skb, t);
3226
4e2ba18e
VY		 3227 /* security context */
3228 if (xfrm_ctx) {
4df864c1
JB		 3229 sec_ctx = skb_put(skb,
3230 sizeof(struct sadb_x_sec_ctx) + ctx_size);
4e2ba18e
VY		 3231 sec_ctx->sadb_x_sec_len =
3232 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
3233 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
3234 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
3235 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
3236 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
3237 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
3238 xfrm_ctx->ctx_len);
3239 }
3240
36f41f8f
ED		 3241 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3242 xs_net(x));
1da177e4
LT		 3243}
3244
cb969f07 3245static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
8ff24541 3246 u8 *data, int len, int *dir)
1da177e4 3247{
07fb0f17 3248 struct net *net = sock_net(sk);
1da177e4
LT		 3249 struct xfrm_policy *xp;
3250 struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
df71837d 3251 struct sadb_x_sec_ctx *sec_ctx;
1da177e4 3252
cb969f07 3253 switch (sk->sk_family) {
1da177e4
LT		 3254 case AF_INET:
3255 if (opt != IP_IPSEC_POLICY) {
3256 *dir = -EOPNOTSUPP;
3257 return NULL;
3258 }
3259 break;
dfd56b8b 3260#if IS_ENABLED(CONFIG_IPV6)
1da177e4
LT		 3261 case AF_INET6:
3262 if (opt != IPV6_IPSEC_POLICY) {
3263 *dir = -EOPNOTSUPP;
3264 return NULL;
3265 }
3266 break;
3267#endif
3268 default:
3269 *dir = -EINVAL;
3270 return NULL;
3271 }
3272
3273 *dir = -EINVAL;
3274
3275 if (len < sizeof(struct sadb_x_policy) ||
3276 pol->sadb_x_policy_len*8 > len ||
3277 pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
3278 (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
3279 return NULL;
3280
07fb0f17 3281 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
1da177e4
LT		 3282 if (xp == NULL) {
3283 *dir = -ENOBUFS;
3284 return NULL;
3285 }
3286
3287 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
3288 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
3289
3290 xp->lft.soft_byte_limit = XFRM_INF;
3291 xp->lft.hard_byte_limit = XFRM_INF;
3292 xp->lft.soft_packet_limit = XFRM_INF;
3293 xp->lft.hard_packet_limit = XFRM_INF;
cb969f07 3294 xp->family = sk->sk_family;
1da177e4
LT		 3295
3296 xp->xfrm_nr = 0;
3297 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
3298 (*dir = parse_ipsecrequests(xp, pol)) < 0)
3299 goto out;
3300
df71837d
TJ		 3301 /* security context too */
3302 if (len >= (pol->sadb_x_policy_len*8 +
3303 sizeof(struct sadb_x_sec_ctx))) {
3304 char *p = (char *)pol;
3305 struct xfrm_user_sec_ctx *uctx;
3306
3307 p += pol->sadb_x_policy_len*8;
3308 sec_ctx = (struct sadb_x_sec_ctx *)p;
3309 if (len < pol->sadb_x_policy_len*8 +
d90c9024 3310 sec_ctx->sadb_x_sec_len*8) {
cb969f07 3311 *dir = -EINVAL;
df71837d 3312 goto out;
cb969f07 3313 }
df71837d
TJ		 3314 if ((*dir = verify_sec_ctx_len(p)))
3315 goto out;
87536a81 3316 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_ATOMIC);
52a4c640 3317 *dir = security_xfrm_policy_alloc(&xp->security, uctx, GFP_ATOMIC);
df71837d
TJ		 3318 kfree(uctx);
3319
3320 if (*dir)
3321 goto out;
3322 }
3323
1da177e4
LT		 3324 *dir = pol->sadb_x_policy_dir-1;
3325 return xp;
3326
3327out:
70e90679 3328 xp->walk.dead = 1;
64c31b3f 3329 xfrm_policy_destroy(xp);
1da177e4
LT		 3330 return NULL;
3331}
3332
5d36b180 3333static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
1da177e4
LT		 3334{
3335 struct sk_buff *skb;
3336 struct sadb_msg *hdr;
3337 struct sadb_sa *sa;
3338 struct sadb_address *addr;
3339 struct sadb_x_nat_t_port *n_port;
1da177e4
LT		 3340 int sockaddr_size;
3341 int size;
3342 __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
3343 struct xfrm_encap_tmpl *natt = NULL;
3344
3345 sockaddr_size = pfkey_sockaddr_size(x->props.family);
3346 if (!sockaddr_size)
3347 return -EINVAL;
3348
3349 if (!satype)
3350 return -EINVAL;
3351
3352 if (!x->encap)
3353 return -EINVAL;
3354
3355 natt = x->encap;
3356
3357 /* Build an SADB_X_NAT_T_NEW_MAPPING message:
3358 *
3359 * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
3360 * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
3361 */
8ff24541 3362
1da177e4
LT		 3363 size = sizeof(struct sadb_msg) +
3364 sizeof(struct sadb_sa) +
3365 (sizeof(struct sadb_address) * 2) +
3366 (sockaddr_size * 2) +
3367 (sizeof(struct sadb_x_nat_t_port) * 2);
8ff24541 3368
1da177e4
LT		 3369 skb = alloc_skb(size + 16, GFP_ATOMIC);
3370 if (skb == NULL)
3371 return -ENOMEM;
8ff24541 3372
4df864c1 3373 hdr = skb_put(skb, sizeof(struct sadb_msg));
1da177e4
LT		 3374 hdr->sadb_msg_version = PF_KEY_V2;
3375 hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
3376 hdr->sadb_msg_satype = satype;
3377 hdr->sadb_msg_len = size / sizeof(uint64_t);
3378 hdr->sadb_msg_errno = 0;
3379 hdr->sadb_msg_reserved = 0;
3380 hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3381 hdr->sadb_msg_pid = 0;
3382
3383 /* SA */
4df864c1 3384 sa = skb_put(skb, sizeof(struct sadb_sa));
1da177e4
LT		 3385 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
3386 sa->sadb_sa_exttype = SADB_EXT_SA;
3387 sa->sadb_sa_spi = x->id.spi;
3388 sa->sadb_sa_replay = 0;
3389 sa->sadb_sa_state = 0;
3390 sa->sadb_sa_auth = 0;
3391 sa->sadb_sa_encrypt = 0;
3392 sa->sadb_sa_flags = 0;
3393
3394 /* ADDRESS_SRC (old addr) */
4df864c1 3395 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
8ff24541 3396 addr->sadb_address_len =
1da177e4
LT		 3397 (sizeof(struct sadb_address)+sockaddr_size)/
3398 sizeof(uint64_t);
3399 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3400 addr->sadb_address_proto = 0;
3401 addr->sadb_address_reserved = 0;
e5b56652
YH		 3402 addr->sadb_address_prefixlen =
3403 pfkey_sockaddr_fill(&x->props.saddr, 0,
3404 (struct sockaddr *) (addr + 1),
3405 x->props.family);
3406 if (!addr->sadb_address_prefixlen)
1da177e4
LT		 3407 BUG();
3408
3409 /* NAT_T_SPORT (old port) */
4df864c1 3410 n_port = skb_put(skb, sizeof(*n_port));
1da177e4
LT		 3411 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3412 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
3413 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
3414 n_port->sadb_x_nat_t_port_reserved = 0;
3415
3416 /* ADDRESS_DST (new addr) */
4df864c1 3417 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
8ff24541 3418 addr->sadb_address_len =
1da177e4
LT		 3419 (sizeof(struct sadb_address)+sockaddr_size)/
3420 sizeof(uint64_t);
3421 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3422 addr->sadb_address_proto = 0;
3423 addr->sadb_address_reserved = 0;
e5b56652
YH		 3424 addr->sadb_address_prefixlen =
3425 pfkey_sockaddr_fill(ipaddr, 0,
3426 (struct sockaddr *) (addr + 1),
3427 x->props.family);
3428 if (!addr->sadb_address_prefixlen)
1da177e4
LT		 3429 BUG();
3430
3431 /* NAT_T_DPORT (new port) */
4df864c1 3432 n_port = skb_put(skb, sizeof(*n_port));
1da177e4
LT		 3433 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3434 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
3435 n_port->sadb_x_nat_t_port_port = sport;
3436 n_port->sadb_x_nat_t_port_reserved = 0;
3437
36f41f8f
ED		 3438 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3439 xs_net(x));
1da177e4
LT		 3440}
3441
08de61be
SS		 3442#ifdef CONFIG_NET_KEY_MIGRATE
3443static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
183cad12 3444 const struct xfrm_selector *sel)
08de61be
SS		 3445{
3446 struct sadb_address *addr;
4df864c1 3447 addr = skb_put(skb, sizeof(struct sadb_address) + sasize);
08de61be
SS		 3448 addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8;
3449 addr->sadb_address_exttype = type;
3450 addr->sadb_address_proto = sel->proto;
3451 addr->sadb_address_reserved = 0;
3452
3453 switch (type) {
3454 case SADB_EXT_ADDRESS_SRC:
e5b56652
YH		 3455 addr->sadb_address_prefixlen = sel->prefixlen_s;
3456 pfkey_sockaddr_fill(&sel->saddr, 0,
3457 (struct sockaddr *)(addr + 1),
3458 sel->family);
08de61be
SS		 3459 break;
3460 case SADB_EXT_ADDRESS_DST:
e5b56652
YH		 3461 addr->sadb_address_prefixlen = sel->prefixlen_d;
3462 pfkey_sockaddr_fill(&sel->daddr, 0,
3463 (struct sockaddr *)(addr + 1),
3464 sel->family);
08de61be
SS		 3465 break;
3466 default:
3467 return -EINVAL;
3468 }
3469
3470 return 0;
3471}
3472
13c1d189 3473
183cad12 3474static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k)
13c1d189
AE		 3475{
3476 struct sadb_x_kmaddress *kma;
3477 u8 *sa;
3478 int family = k->family;
3479 int socklen = pfkey_sockaddr_len(family);
3480 int size_req;
3481
3482 size_req = (sizeof(struct sadb_x_kmaddress) +
3483 pfkey_sockaddr_pair_size(family));
3484
b080db58 3485 kma = skb_put_zero(skb, size_req);
13c1d189
AE		 3486 kma->sadb_x_kmaddress_len = size_req / 8;
3487 kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS;
3488 kma->sadb_x_kmaddress_reserved = k->reserved;
3489
3490 sa = (u8 *)(kma + 1);
3491 if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) ||
3492 !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family))
3493 return -EINVAL;
3494
3495 return 0;
3496}
3497
08de61be
SS		 3498static int set_ipsecrequest(struct sk_buff *skb,
3499 uint8_t proto, uint8_t mode, int level,
3500 uint32_t reqid, uint8_t family,
183cad12 3501 const xfrm_address_t *src, const xfrm_address_t *dst)
08de61be
SS		 3502{
3503 struct sadb_x_ipsecrequest *rq;
e5b56652
YH		 3504 u8 *sa;
3505 int socklen = pfkey_sockaddr_len(family);
08de61be
SS		 3506 int size_req;
3507
3508 size_req = sizeof(struct sadb_x_ipsecrequest) +
3509 pfkey_sockaddr_pair_size(family);
3510
b080db58 3511 rq = skb_put_zero(skb, size_req);
08de61be
SS		 3512 rq->sadb_x_ipsecrequest_len = size_req;
3513 rq->sadb_x_ipsecrequest_proto = proto;
3514 rq->sadb_x_ipsecrequest_mode = mode;
3515 rq->sadb_x_ipsecrequest_level = level;
3516 rq->sadb_x_ipsecrequest_reqid = reqid;
3517
e5b56652
YH		 3518 sa = (u8 *) (rq + 1);
3519 if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) ||
3520 !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family))
08de61be 3521 return -EINVAL;
08de61be
SS		 3522
3523 return 0;
3524}
3525#endif
3526
3527#ifdef CONFIG_NET_KEY_MIGRATE
183cad12
DM		 3528static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3529 const struct xfrm_migrate *m, int num_bundles,
8bafd730
AA		 3530 const struct xfrm_kmaddress *k,
3531 const struct xfrm_encap_tmpl *encap)
08de61be
SS		 3532{
3533 int i;
3534 int sasize_sel;
3535 int size = 0;
3536 int size_pol = 0;
3537 struct sk_buff *skb;
3538 struct sadb_msg *hdr;
3539 struct sadb_x_policy *pol;
183cad12 3540 const struct xfrm_migrate *mp;
08de61be
SS		 3541
3542 if (type != XFRM_POLICY_TYPE_MAIN)
3543 return 0;
3544
3545 if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH)
3546 return -EINVAL;
3547
13c1d189
AE		 3548 if (k != NULL) {
3549 /* addresses for KM */
3550 size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) +
3551 pfkey_sockaddr_pair_size(k->family));
3552 }
3553
08de61be
SS		 3554 /* selector */
3555 sasize_sel = pfkey_sockaddr_size(sel->family);
3556 if (!sasize_sel)
3557 return -EINVAL;
3558 size += (sizeof(struct sadb_address) + sasize_sel) * 2;
3559
3560 /* policy info */
3561 size_pol += sizeof(struct sadb_x_policy);
3562
3563 /* ipsecrequests */
3564 for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3565 /* old locator pair */
3566 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3567 pfkey_sockaddr_pair_size(mp->old_family);
3568 /* new locator pair */
3569 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3570 pfkey_sockaddr_pair_size(mp->new_family);
3571 }
3572
3573 size += sizeof(struct sadb_msg) + size_pol;
3574
3575 /* alloc buffer */
3576 skb = alloc_skb(size, GFP_ATOMIC);
3577 if (skb == NULL)
3578 return -ENOMEM;
3579
4df864c1 3580 hdr = skb_put(skb, sizeof(struct sadb_msg));
08de61be
SS		 3581 hdr->sadb_msg_version = PF_KEY_V2;
3582 hdr->sadb_msg_type = SADB_X_MIGRATE;
3583 hdr->sadb_msg_satype = pfkey_proto2satype(m->proto);
3584 hdr->sadb_msg_len = size / 8;
3585 hdr->sadb_msg_errno = 0;
3586 hdr->sadb_msg_reserved = 0;
3587 hdr->sadb_msg_seq = 0;
3588 hdr->sadb_msg_pid = 0;
3589
13c1d189
AE		 3590 /* Addresses to be used by KM for negotiation, if ext is available */
3591 if (k != NULL && (set_sadb_kmaddress(skb, k) < 0))
89eb06f1 3592 goto err;
13c1d189 3593
08de61be
SS		 3594 /* selector src */
3595 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel);
3596
3597 /* selector dst */
3598 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel);
3599
3600 /* policy information */
4df864c1 3601 pol = skb_put(skb, sizeof(struct sadb_x_policy));
08de61be
SS		 3602 pol->sadb_x_policy_len = size_pol / 8;
3603 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3604 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3605 pol->sadb_x_policy_dir = dir + 1;
ff862a46 3606 pol->sadb_x_policy_reserved = 0;
08de61be
SS		 3607 pol->sadb_x_policy_id = 0;
3608 pol->sadb_x_policy_priority = 0;
3609
3610 for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3611 /* old ipsecrequest */
55569ce2
KM		 3612 int mode = pfkey_mode_from_xfrm(mp->mode);
3613 if (mode < 0)
d4782c32 3614 goto err;
55569ce2 3615 if (set_ipsecrequest(skb, mp->proto, mode,
08de61be
SS		 3616 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3617 mp->reqid, mp->old_family,
d4782c32
PM		 3618 &mp->old_saddr, &mp->old_daddr) < 0)
3619 goto err;
08de61be
SS		 3620
3621 /* new ipsecrequest */
55569ce2 3622 if (set_ipsecrequest(skb, mp->proto, mode,
08de61be
SS		 3623 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3624 mp->reqid, mp->new_family,
d4782c32
PM		 3625 &mp->new_saddr, &mp->new_daddr) < 0)
3626 goto err;
08de61be
SS		 3627 }
3628
3629 /* broadcast migrate message to sockets */
36f41f8f 3630 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net);
08de61be
SS		 3631
3632 return 0;
d4782c32
PM		 3633
3634err:
3635 kfree_skb(skb);
3636 return -EINVAL;
08de61be
SS		 3637}
3638#else
183cad12
DM		 3639static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3640 const struct xfrm_migrate *m, int num_bundles,
8bafd730
AA		 3641 const struct xfrm_kmaddress *k,
3642 const struct xfrm_encap_tmpl *encap)
08de61be
SS		 3643{
3644 return -ENOPROTOOPT;
3645}
3646#endif
3647
1b784140 3648static int pfkey_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1da177e4
LT		 3649{
3650 struct sock *sk = sock->sk;
3651 struct sk_buff *skb = NULL;
3652 struct sadb_msg *hdr = NULL;
3653 int err;
283bc9f3 3654 struct net *net = sock_net(sk);
1da177e4
LT		 3655
3656 err = -EOPNOTSUPP;
3657 if (msg->msg_flags & MSG_OOB)
3658 goto out;
3659
3660 err = -EMSGSIZE;
95c96174 3661 if ((unsigned int)len > sk->sk_sndbuf - 32)
1da177e4
LT		 3662 goto out;
3663
3664 err = -ENOBUFS;
3665 skb = alloc_skb(len, GFP_KERNEL);
3666 if (skb == NULL)
3667 goto out;
3668
3669 err = -EFAULT;
6ce8e9ce 3670 if (memcpy_from_msg(skb_put(skb,len), msg, len))
1da177e4
LT		 3671 goto out;
3672
3673 hdr = pfkey_get_base_msg(skb, &err);
3674 if (!hdr)
3675 goto out;
3676
283bc9f3 3677 mutex_lock(&net->xfrm.xfrm_cfg_mutex);
1da177e4 3678 err = pfkey_process(sk, skb, hdr);
283bc9f3 3679 mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
1da177e4
LT		 3680
3681out:
3682 if (err && hdr && pfkey_error(hdr, err, sk) == 0)
3683 err = 0;
6f961068 3684 kfree_skb(skb);
1da177e4
LT		 3685
3686 return err ? : len;
3687}
3688
1b784140 3689static int pfkey_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
1da177e4
LT		 3690 int flags)
3691{
3692 struct sock *sk = sock->sk;
83321d6b 3693 struct pfkey_sock *pfk = pfkey_sk(sk);
1da177e4
LT		 3694 struct sk_buff *skb;
3695 int copied, err;
3696
3697 err = -EINVAL;
3698 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
3699 goto out;
3700
f4b41f06 3701 skb = skb_recv_datagram(sk, flags, &err);
1da177e4
LT		 3702 if (skb == NULL)
3703 goto out;
3704
3705 copied = skb->len;
3706 if (copied > len) {
3707 msg->msg_flags |= MSG_TRUNC;
3708 copied = len;
3709 }
3710
badff6d0 3711 skb_reset_transport_header(skb);
51f3d02b 3712 err = skb_copy_datagram_msg(skb, 0, msg, copied);
1da177e4
LT		 3713 if (err)
3714 goto out_free;
3715
6fd1d51c 3716 sock_recv_cmsgs(msg, sk, skb);
1da177e4
LT		 3717
3718 err = (flags & MSG_TRUNC) ? skb->len : copied;
3719
83321d6b
TT		 3720 if (pfk->dump.dump != NULL &&
3721 3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf)
3722 pfkey_do_dump(pfk);
3723
1da177e4
LT		 3724out_free:
3725 skb_free_datagram(sk, skb);
3726out:
3727 return err;
3728}
3729
90ddc4f0 3730static const struct proto_ops pfkey_ops = {
1da177e4
LT		 3731 .family = PF_KEY,
3732 .owner = THIS_MODULE,
3733 /* Operations that make no sense on pfkey sockets. */
3734 .bind = sock_no_bind,
3735 .connect = sock_no_connect,
3736 .socketpair = sock_no_socketpair,
3737 .accept = sock_no_accept,
3738 .getname = sock_no_getname,
3739 .ioctl = sock_no_ioctl,
3740 .listen = sock_no_listen,
3741 .shutdown = sock_no_shutdown,
1da177e4
LT		 3742 .mmap = sock_no_mmap,
3743 .sendpage = sock_no_sendpage,
3744
3745 /* Now the operations that really occur. */
3746 .release = pfkey_release,
a11e1d43 3747 .poll = datagram_poll,
1da177e4
LT		 3748 .sendmsg = pfkey_sendmsg,
3749 .recvmsg = pfkey_recvmsg,
3750};
3751
ec1b4cf7 3752static const struct net_proto_family pfkey_family_ops = {
1da177e4
LT		 3753 .family = PF_KEY,
3754 .create = pfkey_create,
3755 .owner = THIS_MODULE,
3756};
3757
3758#ifdef CONFIG_PROC_FS
bd2f7476 3759static int pfkey_seq_show(struct seq_file *f, void *v)
1da177e4 3760{
27b5b865 3761 struct sock *s = sk_entry(v);
1da177e4 3762
bd2f7476
PE		 3763 if (v == SEQ_START_TOKEN)
3764 seq_printf(f ,"sk RefCnt Rmem Wmem User Inode\n");
3765 else
71338aa7 3766 seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n",
1da177e4 3767 s,
41c6d650 3768 refcount_read(&s->sk_refcnt),
31e6d363
ED		 3769 sk_rmem_alloc_get(s),
3770 sk_wmem_alloc_get(s),
a7cb5a49 3771 from_kuid_munged(seq_user_ns(f), sock_i_uid(s)),
1da177e4
LT		 3772 sock_i_ino(s)
3773 );
bd2f7476
PE		 3774 return 0;
3775}
3776
3777static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos)
ada440e3 3778 __acquires(rcu)
bd2f7476 3779{
7013ec30 3780 struct net *net = seq_file_net(f);
3fa87a32 3781 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
1da177e4 3782
7f6b9dbd 3783 rcu_read_lock();
3784 return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos);
bd2f7476
PE		 3785}
3786
3787static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos)
3788{
7013ec30 3789 struct net *net = seq_file_net(f);
3fa87a32
AD		 3790 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3791
7f6b9dbd 3792 return seq_hlist_next_rcu(v, &net_pfkey->table, ppos);
bd2f7476 3793}
1da177e4 3794
bd2f7476 3795static void pfkey_seq_stop(struct seq_file *f, void *v)
ada440e3 3796 __releases(rcu)
bd2f7476 3797{
7f6b9dbd 3798 rcu_read_unlock();
bd2f7476 3799}
1da177e4 3800
98147d52 3801static const struct seq_operations pfkey_seq_ops = {
bd2f7476
PE		 3802 .start = pfkey_seq_start,
3803 .next = pfkey_seq_next,
3804 .stop = pfkey_seq_stop,
3805 .show = pfkey_seq_show,
3806};
1da177e4 3807
7013ec30 3808static int __net_init pfkey_init_proc(struct net *net)
61145aa1 3809{
bd2f7476
PE		 3810 struct proc_dir_entry *e;
3811
c3506372
CH		 3812 e = proc_create_net("pfkey", 0, net->proc_net, &pfkey_seq_ops,
3813 sizeof(struct seq_net_private));
bd2f7476 3814 if (e == NULL)
61145aa1 3815 return -ENOMEM;
bd2f7476 3816
bd2f7476 3817 return 0;
61145aa1
PE		 3818}
3819
2c8c1e72 3820static void __net_exit pfkey_exit_proc(struct net *net)
61145aa1 3821{
ece31ffd 3822 remove_proc_entry("pfkey", net->proc_net);
61145aa1
PE		 3823}
3824#else
2c8c1e72 3825static inline int pfkey_init_proc(struct net *net)
61145aa1
PE		 3826{
3827 return 0;
3828}
3829
2c8c1e72 3830static inline void pfkey_exit_proc(struct net *net)
61145aa1
PE		 3831{
3832}
1da177e4
LT		 3833#endif
3834
3835static struct xfrm_mgr pfkeyv2_mgr =
3836{
1da177e4
LT		 3837 .notify = pfkey_send_notify,
3838 .acquire = pfkey_send_acquire,
3839 .compile_policy = pfkey_compile_policy,
3840 .new_mapping = pfkey_send_new_mapping,
26b15dad 3841 .notify_policy = pfkey_send_policy_notify,
08de61be 3842 .migrate = pfkey_send_migrate,
0f24558e 3843 .is_alive = pfkey_is_alive,
1da177e4
LT		 3844};
3845
3fa87a32
AD		 3846static int __net_init pfkey_net_init(struct net *net)
3847{
23c049ca 3848 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3fa87a32
AD		 3849 int rv;
3850
3fa87a32
AD		 3851 INIT_HLIST_HEAD(&net_pfkey->table);
3852 atomic_set(&net_pfkey->socks_nr, 0);
23c049ca 3853
7013ec30 3854 rv = pfkey_init_proc(net);
3fa87a32 3855
3fa87a32
AD		 3856 return rv;
3857}
3858
3859static void __net_exit pfkey_net_exit(struct net *net)
3860{
3861 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3862
7013ec30 3863 pfkey_exit_proc(net);
663faeab 3864 WARN_ON(!hlist_empty(&net_pfkey->table));
3fa87a32
AD		 3865}
3866
3867static struct pernet_operations pfkey_net_ops = {
3868 .init = pfkey_net_init,
3869 .exit = pfkey_net_exit,
23c049ca
EB		 3870 .id = &pfkey_net_id,
3871 .size = sizeof(struct netns_pfkey),
3fa87a32
AD		 3872};
3873
1da177e4
LT		 3874static void __exit ipsec_pfkey_exit(void)
3875{
3876 xfrm_unregister_km(&pfkeyv2_mgr);
1da177e4 3877 sock_unregister(PF_KEY);
180211b8 3878 unregister_pernet_subsys(&pfkey_net_ops);
1da177e4
LT		 3879 proto_unregister(&key_proto);
3880}
3881
3882static int __init ipsec_pfkey_init(void)
3883{
3884 int err = proto_register(&key_proto, 0);
3885
3886 if (err != 0)
3887 goto out;
3888
180211b8 3889 err = register_pernet_subsys(&pfkey_net_ops);
1da177e4
LT		 3890 if (err != 0)
3891 goto out_unregister_key_proto;
180211b8
AD		 3892 err = sock_register(&pfkey_family_ops);
3893 if (err != 0)
3894 goto out_unregister_pernet;
1da177e4
LT		 3895 err = xfrm_register_km(&pfkeyv2_mgr);
3896 if (err != 0)
7013ec30 3897 goto out_sock_unregister;
1da177e4
LT		 3898out:
3899 return err;
180211b8 3900
1da177e4 3901out_sock_unregister:
1da177e4 3902 sock_unregister(PF_KEY);
180211b8
AD		 3903out_unregister_pernet:
3904 unregister_pernet_subsys(&pfkey_net_ops);
1da177e4
LT		 3905out_unregister_key_proto:
3906 proto_unregister(&key_proto);
3907 goto out;
3908}
3909
3910module_init(ipsec_pfkey_init);
3911module_exit(ipsec_pfkey_exit);
3912MODULE_LICENSE("GPL");
3913MODULE_ALIAS_NETPROTO(PF_KEY);
Linux 6.x block layer and io_uring tree(s)