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Merge tag 'mips_6.6' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux
[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
2f479651 1264 x->encap = kzalloc(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 }
1284 }
1285
72cb6962
HX		 1286 err = xfrm_init_state(x);
1287 if (err)
1da177e4 1288 goto out;
72cb6962 1289
1da177e4 1290 x->km.seq = hdr->sadb_msg_seq;
1da177e4
LT		 1291 return x;
1292
1293out:
1294 x->km.state = XFRM_STATE_DEAD;
1295 xfrm_state_put(x);
1296 return ERR_PTR(err);
1297}
1298
4c93fbb0 1299static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1da177e4
LT		 1300{
1301 return -EOPNOTSUPP;
1302}
1303
4c93fbb0 1304static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1da177e4 1305{
07fb0f17 1306 struct net *net = sock_net(sk);
1da177e4
LT		 1307 struct sk_buff *resp_skb;
1308 struct sadb_x_sa2 *sa2;
1309 struct sadb_address *saddr, *daddr;
1310 struct sadb_msg *out_hdr;
658b219e 1311 struct sadb_spirange *range;
1da177e4 1312 struct xfrm_state *x = NULL;
55569ce2 1313 int mode;
658b219e
HX		 1314 int err;
1315 u32 min_spi, max_spi;
1da177e4
LT		 1316 u32 reqid;
1317 u8 proto;
1318 unsigned short family;
1319 xfrm_address_t *xsaddr = NULL, *xdaddr = NULL;
1320
1321 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1322 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1323 return -EINVAL;
1324
1325 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1326 if (proto == 0)
1327 return -EINVAL;
1328
1329 if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) {
55569ce2
KM		 1330 mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1331 if (mode < 0)
1332 return -EINVAL;
1da177e4
LT		 1333 reqid = sa2->sadb_x_sa2_reqid;
1334 } else {
1335 mode = 0;
1336 reqid = 0;
1337 }
1338
1339 saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1340 daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1341
1342 family = ((struct sockaddr *)(saddr + 1))->sa_family;
1343 switch (family) {
1344 case AF_INET:
1345 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr;
1346 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr;
1347 break;
dfd56b8b 1348#if IS_ENABLED(CONFIG_IPV6)
1da177e4
LT		 1349 case AF_INET6:
1350 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr;
1351 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr;
1352 break;
1353#endif
1354 }
1355
1356 if (hdr->sadb_msg_seq) {
bd55775c 1357 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
70e94e66 1358 if (x && !xfrm_addr_equal(&x->id.daddr, xdaddr, family)) {
1da177e4
LT		 1359 xfrm_state_put(x);
1360 x = NULL;
1361 }
1362 }
1363
1364 if (!x)
7e652640 1365 x = xfrm_find_acq(net, &dummy_mark, mode, reqid, 0, proto, xdaddr, xsaddr, 1, family);
1da177e4
LT		 1366
1367 if (x == NULL)
1368 return -ENOENT;
1369
658b219e
HX		 1370 min_spi = 0x100;
1371 max_spi = 0x0fffffff;
1da177e4 1372
658b219e
HX		 1373 range = ext_hdrs[SADB_EXT_SPIRANGE-1];
1374 if (range) {
1375 min_spi = range->sadb_spirange_min;
1376 max_spi = range->sadb_spirange_max;
1da177e4 1377 }
658b219e 1378
c2dad11e 1379 err = verify_spi_info(x->id.proto, min_spi, max_spi, NULL);
776e9dd9
FD		 1380 if (err) {
1381 xfrm_state_put(x);
1382 return err;
1383 }
1384
c2dad11e 1385 err = xfrm_alloc_spi(x, min_spi, max_spi, NULL);
050f009e 1386 resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x);
1da177e4
LT		 1387
1388 if (IS_ERR(resp_skb)) {
1389 xfrm_state_put(x);
1390 return PTR_ERR(resp_skb);
1391 }
1392
1393 out_hdr = (struct sadb_msg *) resp_skb->data;
1394 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1395 out_hdr->sadb_msg_type = SADB_GETSPI;
1396 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1397 out_hdr->sadb_msg_errno = 0;
1398 out_hdr->sadb_msg_reserved = 0;
1399 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1400 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1401
1402 xfrm_state_put(x);
1403
36f41f8f 1404 pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk, net);
1da177e4
LT		 1405
1406 return 0;
1407}
1408
4c93fbb0 1409static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1da177e4 1410{
07fb0f17 1411 struct net *net = sock_net(sk);
1da177e4
LT		 1412 struct xfrm_state *x;
1413
1414 if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8)
1415 return -EOPNOTSUPP;
1416
1417 if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
1418 return 0;
1419
bd55775c 1420 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1da177e4
LT		 1421 if (x == NULL)
1422 return 0;
1423
1424 spin_lock_bh(&x->lock);
5b8ef341 1425 if (x->km.state == XFRM_STATE_ACQ)
1da177e4 1426 x->km.state = XFRM_STATE_ERROR;
5b8ef341 1427
1da177e4
LT		 1428 spin_unlock_bh(&x->lock);
1429 xfrm_state_put(x);
1430 return 0;
1431}
1432
26b15dad
JHS		 1433static inline int event2poltype(int event)
1434{
1435 switch (event) {
f60f6b8f 1436 case XFRM_MSG_DELPOLICY:
26b15dad 1437 return SADB_X_SPDDELETE;
f60f6b8f 1438 case XFRM_MSG_NEWPOLICY:
26b15dad 1439 return SADB_X_SPDADD;
f60f6b8f 1440 case XFRM_MSG_UPDPOLICY:
26b15dad 1441 return SADB_X_SPDUPDATE;
f60f6b8f 1442 case XFRM_MSG_POLEXPIRE:
26b15dad
JHS		 1443 // return SADB_X_SPDEXPIRE;
1444 default:
207024b9 1445 pr_err("pfkey: Unknown policy event %d\n", event);
26b15dad
JHS		 1446 break;
1447 }
1448
1449 return 0;
1450}
1451
1452static inline int event2keytype(int event)
1453{
1454 switch (event) {
f60f6b8f 1455 case XFRM_MSG_DELSA:
26b15dad 1456 return SADB_DELETE;
f60f6b8f 1457 case XFRM_MSG_NEWSA:
26b15dad 1458 return SADB_ADD;
f60f6b8f 1459 case XFRM_MSG_UPDSA:
26b15dad 1460 return SADB_UPDATE;
f60f6b8f 1461 case XFRM_MSG_EXPIRE:
26b15dad
JHS		 1462 return SADB_EXPIRE;
1463 default:
207024b9 1464 pr_err("pfkey: Unknown SA event %d\n", event);
26b15dad
JHS		 1465 break;
1466 }
1467
1468 return 0;
1469}
1470
1471/* ADD/UPD/DEL */
214e005b 1472static int key_notify_sa(struct xfrm_state *x, const struct km_event *c)
26b15dad
JHS		 1473{
1474 struct sk_buff *skb;
1475 struct sadb_msg *hdr;
26b15dad 1476
050f009e 1477 skb = pfkey_xfrm_state2msg(x);
26b15dad
JHS		 1478
1479 if (IS_ERR(skb))
1480 return PTR_ERR(skb);
1481
1482 hdr = (struct sadb_msg *) skb->data;
1483 hdr->sadb_msg_version = PF_KEY_V2;
1484 hdr->sadb_msg_type = event2keytype(c->event);
1485 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1486 hdr->sadb_msg_errno = 0;
1487 hdr->sadb_msg_reserved = 0;
1488 hdr->sadb_msg_seq = c->seq;
15e47304 1489 hdr->sadb_msg_pid = c->portid;
26b15dad 1490
36f41f8f 1491 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xs_net(x));
26b15dad
JHS		 1492
1493 return 0;
1494}
1da177e4 1495
4c93fbb0 1496static int pfkey_add(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1da177e4 1497{
07fb0f17 1498 struct net *net = sock_net(sk);
1da177e4
LT		 1499 struct xfrm_state *x;
1500 int err;
26b15dad 1501 struct km_event c;
1da177e4 1502
07fb0f17 1503 x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs);
1da177e4
LT		 1504 if (IS_ERR(x))
1505 return PTR_ERR(x);
1506
26b15dad 1507 xfrm_state_hold(x);
1da177e4
LT		 1508 if (hdr->sadb_msg_type == SADB_ADD)
1509 err = xfrm_state_add(x);
1510 else
1511 err = xfrm_state_update(x);
1512
2e71029e 1513 xfrm_audit_state_add(x, err ? 0 : 1, true);
161a09e7 1514
1da177e4
LT		 1515 if (err < 0) {
1516 x->km.state = XFRM_STATE_DEAD;
21380b81 1517 __xfrm_state_put(x);
7d6dfe1f 1518 goto out;
1da177e4
LT		 1519 }
1520
26b15dad 1521 if (hdr->sadb_msg_type == SADB_ADD)
f60f6b8f 1522 c.event = XFRM_MSG_NEWSA;
26b15dad 1523 else
f60f6b8f 1524 c.event = XFRM_MSG_UPDSA;
26b15dad 1525 c.seq = hdr->sadb_msg_seq;
15e47304 1526 c.portid = hdr->sadb_msg_pid;
26b15dad 1527 km_state_notify(x, &c);
7d6dfe1f 1528out:
26b15dad 1529 xfrm_state_put(x);
26b15dad 1530 return err;
1da177e4
LT		 1531}
1532
4c93fbb0 1533static int pfkey_delete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1da177e4 1534{
07fb0f17 1535 struct net *net = sock_net(sk);
1da177e4 1536 struct xfrm_state *x;
26b15dad
JHS		 1537 struct km_event c;
1538 int err;
1da177e4
LT		 1539
1540 if (!ext_hdrs[SADB_EXT_SA-1] ||
1541 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1542 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1543 return -EINVAL;
1544
07fb0f17 1545 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1da177e4
LT		 1546 if (x == NULL)
1547 return -ESRCH;
1548
c8c05a8e
CZ		 1549 if ((err = security_xfrm_state_delete(x)))
1550 goto out;
1551
1da177e4 1552 if (xfrm_state_kern(x)) {
c8c05a8e
CZ		 1553 err = -EPERM;
1554 goto out;
1da177e4 1555 }
161a09e7 1556
26b15dad 1557 err = xfrm_state_delete(x);
161a09e7 1558
c8c05a8e
CZ		 1559 if (err < 0)
1560 goto out;
1da177e4 1561
26b15dad 1562 c.seq = hdr->sadb_msg_seq;
15e47304 1563 c.portid = hdr->sadb_msg_pid;
f60f6b8f 1564 c.event = XFRM_MSG_DELSA;
26b15dad 1565 km_state_notify(x, &c);
c8c05a8e 1566out:
2e71029e 1567 xfrm_audit_state_delete(x, err ? 0 : 1, true);
26b15dad 1568 xfrm_state_put(x);
1da177e4 1569
26b15dad 1570 return err;
1da177e4
LT		 1571}
1572
4c93fbb0 1573static int pfkey_get(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1da177e4 1574{
07fb0f17 1575 struct net *net = sock_net(sk);
1da177e4
LT		 1576 __u8 proto;
1577 struct sk_buff *out_skb;
1578 struct sadb_msg *out_hdr;
1579 struct xfrm_state *x;
1580
1581 if (!ext_hdrs[SADB_EXT_SA-1] ||
1582 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1583 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1584 return -EINVAL;
1585
07fb0f17 1586 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1da177e4
LT		 1587 if (x == NULL)
1588 return -ESRCH;
1589
050f009e 1590 out_skb = pfkey_xfrm_state2msg(x);
1da177e4
LT		 1591 proto = x->id.proto;
1592 xfrm_state_put(x);
1593 if (IS_ERR(out_skb))
1594 return PTR_ERR(out_skb);
1595
1596 out_hdr = (struct sadb_msg *) out_skb->data;
1597 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
435000be 1598 out_hdr->sadb_msg_type = SADB_GET;
1da177e4
LT		 1599 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1600 out_hdr->sadb_msg_errno = 0;
1601 out_hdr->sadb_msg_reserved = 0;
1602 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1603 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
36f41f8f 1604 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1da177e4
LT		 1605
1606 return 0;
1607}
1608
4c93fbb0 1609static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig,
dd0fc66f 1610 gfp_t allocation)
1da177e4
LT		 1611{
1612 struct sk_buff *skb;
1613 struct sadb_msg *hdr;
1614 int len, auth_len, enc_len, i;
1615
7e50f84c 1616 auth_len = xfrm_count_pfkey_auth_supported();
1da177e4
LT		 1617 if (auth_len) {
1618 auth_len *= sizeof(struct sadb_alg);
1619 auth_len += sizeof(struct sadb_supported);
1620 }
8ff24541 1621
7e50f84c 1622 enc_len = xfrm_count_pfkey_enc_supported();
1da177e4
LT		 1623 if (enc_len) {
1624 enc_len *= sizeof(struct sadb_alg);
1625 enc_len += sizeof(struct sadb_supported);
1626 }
8ff24541 1627
1da177e4
LT		 1628 len = enc_len + auth_len + sizeof(struct sadb_msg);
1629
1630 skb = alloc_skb(len + 16, allocation);
1631 if (!skb)
1632 goto out_put_algs;
1633
4df864c1 1634 hdr = skb_put(skb, sizeof(*hdr));
1da177e4
LT		 1635 pfkey_hdr_dup(hdr, orig);
1636 hdr->sadb_msg_errno = 0;
1637 hdr->sadb_msg_len = len / sizeof(uint64_t);
1638
1639 if (auth_len) {
1640 struct sadb_supported *sp;
1641 struct sadb_alg *ap;
1642
4df864c1 1643 sp = skb_put(skb, auth_len);
1da177e4
LT		 1644 ap = (struct sadb_alg *) (sp + 1);
1645
1646 sp->sadb_supported_len = auth_len / sizeof(uint64_t);
1647 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
1648
1649 for (i = 0; ; i++) {
1650 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1651 if (!aalg)
1652 break;
7e50f84c
JK		 1653 if (!aalg->pfkey_supported)
1654 continue;
1da177e4
LT		 1655 if (aalg->available)
1656 *ap++ = aalg->desc;
1657 }
1658 }
1659
1660 if (enc_len) {
1661 struct sadb_supported *sp;
1662 struct sadb_alg *ap;
1663
4df864c1 1664 sp = skb_put(skb, enc_len);
1da177e4
LT		 1665 ap = (struct sadb_alg *) (sp + 1);
1666
1667 sp->sadb_supported_len = enc_len / sizeof(uint64_t);
1668 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
1669
1670 for (i = 0; ; i++) {
1671 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1672 if (!ealg)
1673 break;
7e50f84c
JK		 1674 if (!ealg->pfkey_supported)
1675 continue;
1da177e4
LT		 1676 if (ealg->available)
1677 *ap++ = ealg->desc;
1678 }
1679 }
1680
1681out_put_algs:
1682 return skb;
1683}
1684
4c93fbb0 1685static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1da177e4
LT		 1686{
1687 struct pfkey_sock *pfk = pfkey_sk(sk);
1688 struct sk_buff *supp_skb;
1689
1690 if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
1691 return -EINVAL;
1692
1693 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
1694 if (pfk->registered&(1<<hdr->sadb_msg_satype))
1695 return -EEXIST;
1696 pfk->registered |= (1<<hdr->sadb_msg_satype);
1697 }
1698
ba953a9d 1699 mutex_lock(&pfkey_mutex);
1da177e4 1700 xfrm_probe_algs();
8ff24541 1701
9a564bcc 1702 supp_skb = compose_sadb_supported(hdr, GFP_KERNEL | __GFP_ZERO);
ba953a9d
HX		 1703 mutex_unlock(&pfkey_mutex);
1704
1da177e4
LT		 1705 if (!supp_skb) {
1706 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1707 pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1708
1709 return -ENOBUFS;
1710 }
1711
36f41f8f
ED		 1712 pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk,
1713 sock_net(sk));
1da177e4
LT		 1714 return 0;
1715}
1716
4c93fbb0 1717static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr)
8be987d7
JHS		 1718{
1719 struct sk_buff *skb;
1720 struct sadb_msg *hdr;
1721
1722 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1723 if (!skb)
1724 return -ENOBUFS;
1725
59ae1d12 1726 hdr = skb_put_data(skb, ihdr, sizeof(struct sadb_msg));
8be987d7
JHS		 1727 hdr->sadb_msg_errno = (uint8_t) 0;
1728 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1729
36f41f8f
ED		 1730 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ONE, sk,
1731 sock_net(sk));
8be987d7
JHS		 1732}
1733
214e005b 1734static int key_notify_sa_flush(const struct km_event *c)
26b15dad
JHS		 1735{
1736 struct sk_buff *skb;
1737 struct sadb_msg *hdr;
1738
1739 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1740 if (!skb)
1741 return -ENOBUFS;
4df864c1 1742 hdr = skb_put(skb, sizeof(struct sadb_msg));
bf08867f 1743 hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
151bb0ff 1744 hdr->sadb_msg_type = SADB_FLUSH;
26b15dad 1745 hdr->sadb_msg_seq = c->seq;
15e47304 1746 hdr->sadb_msg_pid = c->portid;
26b15dad
JHS		 1747 hdr->sadb_msg_version = PF_KEY_V2;
1748 hdr->sadb_msg_errno = (uint8_t) 0;
1749 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
a5cc68f3 1750 hdr->sadb_msg_reserved = 0;
26b15dad 1751
36f41f8f 1752 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
26b15dad
JHS		 1753
1754 return 0;
1755}
1756
4c93fbb0 1757static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1da177e4 1758{
07fb0f17 1759 struct net *net = sock_net(sk);
95c96174 1760 unsigned int proto;
26b15dad 1761 struct km_event c;
8be987d7 1762 int err, err2;
1da177e4
LT		 1763
1764 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1765 if (proto == 0)
1766 return -EINVAL;
1767
f75a2804 1768 err = xfrm_state_flush(net, proto, true, false);
8be987d7 1769 err2 = unicast_flush_resp(sk, hdr);
9e64cc95
JHS		 1770 if (err || err2) {
1771 if (err == -ESRCH) /* empty table - go quietly */
1772 err = 0;
8be987d7 1773 return err ? err : err2;
9e64cc95 1774 }
8be987d7 1775
bf08867f 1776 c.data.proto = proto;
26b15dad 1777 c.seq = hdr->sadb_msg_seq;
15e47304 1778 c.portid = hdr->sadb_msg_pid;
f60f6b8f 1779 c.event = XFRM_MSG_FLUSHSA;
07fb0f17 1780 c.net = net;
26b15dad 1781 km_state_notify(NULL, &c);
1da177e4
LT		 1782
1783 return 0;
1784}
1785
1da177e4
LT		 1786static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1787{
83321d6b 1788 struct pfkey_sock *pfk = ptr;
1da177e4
LT		 1789 struct sk_buff *out_skb;
1790 struct sadb_msg *out_hdr;
1791
83321d6b
TT		 1792 if (!pfkey_can_dump(&pfk->sk))
1793 return -ENOBUFS;
1794
050f009e 1795 out_skb = pfkey_xfrm_state2msg(x);
1da177e4
LT		 1796 if (IS_ERR(out_skb))
1797 return PTR_ERR(out_skb);
1798
1799 out_hdr = (struct sadb_msg *) out_skb->data;
83321d6b 1800 out_hdr->sadb_msg_version = pfk->dump.msg_version;
1da177e4
LT		 1801 out_hdr->sadb_msg_type = SADB_DUMP;
1802 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1803 out_hdr->sadb_msg_errno = 0;
1804 out_hdr->sadb_msg_reserved = 0;
12a169e7 1805 out_hdr->sadb_msg_seq = count + 1;
15e47304 1806 out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
12a169e7
HX		 1807
1808 if (pfk->dump.skb)
36f41f8f 1809 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
07fb0f17 1810 &pfk->sk, sock_net(&pfk->sk));
12a169e7
HX		 1811 pfk->dump.skb = out_skb;
1812
1da177e4
LT		 1813 return 0;
1814}
1815
83321d6b
TT		 1816static int pfkey_dump_sa(struct pfkey_sock *pfk)
1817{
07fb0f17
AD		 1818 struct net *net = sock_net(&pfk->sk);
1819 return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk);
83321d6b
TT		 1820}
1821
1822static void pfkey_dump_sa_done(struct pfkey_sock *pfk)
1823{
283bc9f3
FD		 1824 struct net *net = sock_net(&pfk->sk);
1825
1826 xfrm_state_walk_done(&pfk->dump.u.state, net);
83321d6b
TT		 1827}
1828
4c93fbb0 1829static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1da177e4
LT		 1830{
1831 u8 proto;
870a2df4 1832 struct xfrm_address_filter *filter = NULL;
83321d6b
TT		 1833 struct pfkey_sock *pfk = pfkey_sk(sk);
1834
89e357d8
YS		 1835 mutex_lock(&pfk->dump_lock);
1836 if (pfk->dump.dump != NULL) {
1837 mutex_unlock(&pfk->dump_lock);
83321d6b 1838 return -EBUSY;
89e357d8 1839 }
1da177e4
LT		 1840
1841 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
89e357d8
YS		 1842 if (proto == 0) {
1843 mutex_unlock(&pfk->dump_lock);
1da177e4 1844 return -EINVAL;
89e357d8 1845 }
1da177e4 1846
d3623099
ND		 1847 if (ext_hdrs[SADB_X_EXT_FILTER - 1]) {
1848 struct sadb_x_filter *xfilter = ext_hdrs[SADB_X_EXT_FILTER - 1];
1849
75065a89 1850 if ((xfilter->sadb_x_filter_splen >
37bd2242 1851 (sizeof(xfrm_address_t) << 3)) ||
75065a89 1852 (xfilter->sadb_x_filter_dplen >
37bd2242
MS		 1853 (sizeof(xfrm_address_t) << 3))) {
1854 mutex_unlock(&pfk->dump_lock);
1855 return -EINVAL;
1856 }
d3623099 1857 filter = kmalloc(sizeof(*filter), GFP_KERNEL);
89e357d8
YS		 1858 if (filter == NULL) {
1859 mutex_unlock(&pfk->dump_lock);
d3623099 1860 return -ENOMEM;
89e357d8 1861 }
d3623099
ND		 1862
1863 memcpy(&filter->saddr, &xfilter->sadb_x_filter_saddr,
1864 sizeof(xfrm_address_t));
1865 memcpy(&filter->daddr, &xfilter->sadb_x_filter_daddr,
1866 sizeof(xfrm_address_t));
1867 filter->family = xfilter->sadb_x_filter_family;
1868 filter->splen = xfilter->sadb_x_filter_splen;
1869 filter->dplen = xfilter->sadb_x_filter_dplen;
1870 }
1871
83321d6b 1872 pfk->dump.msg_version = hdr->sadb_msg_version;
15e47304 1873 pfk->dump.msg_portid = hdr->sadb_msg_pid;
83321d6b
TT		 1874 pfk->dump.dump = pfkey_dump_sa;
1875 pfk->dump.done = pfkey_dump_sa_done;
d3623099 1876 xfrm_state_walk_init(&pfk->dump.u.state, proto, filter);
89e357d8 1877 mutex_unlock(&pfk->dump_lock);
4c563f76 1878
83321d6b 1879 return pfkey_do_dump(pfk);
1da177e4
LT		 1880}
1881
4c93fbb0 1882static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1da177e4
LT		 1883{
1884 struct pfkey_sock *pfk = pfkey_sk(sk);
1885 int satype = hdr->sadb_msg_satype;
4c93fbb0 1886 bool reset_errno = false;
1da177e4
LT		 1887
1888 if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
4c93fbb0 1889 reset_errno = true;
1da177e4
LT		 1890 if (satype != 0 && satype != 1)
1891 return -EINVAL;
1892 pfk->promisc = satype;
1893 }
4c93fbb0
DM		 1894 if (reset_errno && skb_cloned(skb))
1895 skb = skb_copy(skb, GFP_KERNEL);
1896 else
1897 skb = skb_clone(skb, GFP_KERNEL);
1898
1899 if (reset_errno && skb) {
1900 struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data;
1901 new_hdr->sadb_msg_errno = 0;
1902 }
1903
36f41f8f 1904 pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk));
1da177e4
LT		 1905 return 0;
1906}
1907
1908static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1909{
1910 int i;
1911 u32 reqid = *(u32*)ptr;
1912
1913 for (i=0; i<xp->xfrm_nr; i++) {
1914 if (xp->xfrm_vec[i].reqid == reqid)
1915 return -EEXIST;
1916 }
1917 return 0;
1918}
1919
07fb0f17 1920static u32 gen_reqid(struct net *net)
1da177e4 1921{
4c563f76 1922 struct xfrm_policy_walk walk;
1da177e4 1923 u32 start;
4c563f76 1924 int rc;
1da177e4
LT		 1925 static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1926
1927 start = reqid;
1928 do {
1929 ++reqid;
1930 if (reqid == 0)
1931 reqid = IPSEC_MANUAL_REQID_MAX+1;
4c563f76 1932 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN);
07fb0f17 1933 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid);
283bc9f3 1934 xfrm_policy_walk_done(&walk, net);
4c563f76 1935 if (rc != -EEXIST)
1da177e4
LT		 1936 return reqid;
1937 } while (reqid != start);
1938 return 0;
1939}
1940
1941static int
cf3128a7
TB		 1942parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_policy *pol,
1943 struct sadb_x_ipsecrequest *rq)
1da177e4 1944{
07fb0f17 1945 struct net *net = xp_net(xp);
1da177e4 1946 struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
55569ce2 1947 int mode;
1da177e4
LT		 1948
1949 if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1950 return -ELOOP;
1951
1952 if (rq->sadb_x_ipsecrequest_mode == 0)
1953 return -EINVAL;
dbb2483b
CW		 1954 if (!xfrm_id_proto_valid(rq->sadb_x_ipsecrequest_proto))
1955 return -EINVAL;
1da177e4 1956
dbb2483b 1957 t->id.proto = rq->sadb_x_ipsecrequest_proto;
55569ce2
KM		 1958 if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0)
1959 return -EINVAL;
1960 t->mode = mode;
cf3128a7
TB		 1961 if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE) {
1962 if ((mode == XFRM_MODE_TUNNEL || mode == XFRM_MODE_BEET) &&
1963 pol->sadb_x_policy_dir == IPSEC_DIR_OUTBOUND)
1964 return -EINVAL;
1da177e4 1965 t->optional = 1;
cf3128a7 1966 } else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1da177e4
LT		 1967 t->reqid = rq->sadb_x_ipsecrequest_reqid;
1968 if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1969 t->reqid = 0;
07fb0f17 1970 if (!t->reqid && !(t->reqid = gen_reqid(net)))
1da177e4
LT		 1971 return -ENOBUFS;
1972 }
1973
1974 /* addresses present only in tunnel mode */
7e49e6de 1975 if (t->mode == XFRM_MODE_TUNNEL) {
096f41d3 1976 int err;
5f95ac91 1977
096f41d3
HX		 1978 err = parse_sockaddr_pair(
1979 (struct sockaddr *)(rq + 1),
1980 rq->sadb_x_ipsecrequest_len - sizeof(*rq),
1981 &t->saddr, &t->id.daddr, &t->encap_family);
1982 if (err)
1983 return err;
2718aa7c
MK		 1984 } else
1985 t->encap_family = xp->family;
1986
1da177e4 1987 /* No way to set this via kame pfkey */
c5d18e98 1988 t->allalgs = 1;
1da177e4
LT		 1989 xp->xfrm_nr++;
1990 return 0;
1991}
1992
1993static int
1994parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
1995{
1996 int err;
1997 int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
1998 struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
1999
f674e72f
DC		 2000 if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy))
2001 return -EINVAL;
2002
096f41d3
HX		 2003 while (len >= sizeof(*rq)) {
2004 if (len < rq->sadb_x_ipsecrequest_len ||
2005 rq->sadb_x_ipsecrequest_len < sizeof(*rq))
2006 return -EINVAL;
2007
cf3128a7 2008 if ((err = parse_ipsecrequest(xp, pol, rq)) < 0)
1da177e4
LT		 2009 return err;
2010 len -= rq->sadb_x_ipsecrequest_len;
2011 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
2012 }
2013 return 0;
2014}
2015
4c93fbb0 2016static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp)
df71837d 2017{
4fc735d9 2018 struct xfrm_sec_ctx *xfrm_ctx = xp->security;
df71837d
TJ		 2019
2020 if (xfrm_ctx) {
2021 int len = sizeof(struct sadb_x_sec_ctx);
2022 len += xfrm_ctx->ctx_len;
2023 return PFKEY_ALIGN8(len);
2024 }
2025 return 0;
2026}
2027
4c93fbb0 2028static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp)
1da177e4 2029{
4c93fbb0 2030 const struct xfrm_tmpl *t;
1da177e4 2031 int sockaddr_size = pfkey_sockaddr_size(xp->family);
2718aa7c
MK		 2032 int socklen = 0;
2033 int i;
2034
2035 for (i=0; i<xp->xfrm_nr; i++) {
2036 t = xp->xfrm_vec + i;
9e8b4ed8 2037 socklen += pfkey_sockaddr_len(t->encap_family);
2718aa7c 2038 }
1da177e4
LT		 2039
2040 return sizeof(struct sadb_msg) +
2041 (sizeof(struct sadb_lifetime) * 3) +
8ff24541 2042 (sizeof(struct sadb_address) * 2) +
1da177e4
LT		 2043 (sockaddr_size * 2) +
2044 sizeof(struct sadb_x_policy) +
2718aa7c
MK		 2045 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
2046 (socklen * 2) +
df71837d 2047 pfkey_xfrm_policy2sec_ctx_size(xp);
1da177e4
LT		 2048}
2049
4c93fbb0 2050static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp)
1da177e4
LT		 2051{
2052 struct sk_buff *skb;
2053 int size;
2054
2055 size = pfkey_xfrm_policy2msg_size(xp);
2056
2057 skb = alloc_skb(size + 16, GFP_ATOMIC);
2058 if (skb == NULL)
2059 return ERR_PTR(-ENOBUFS);
2060
2061 return skb;
2062}
2063
4c93fbb0 2064static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir)
1da177e4
LT		 2065{
2066 struct sadb_msg *hdr;
2067 struct sadb_address *addr;
2068 struct sadb_lifetime *lifetime;
2069 struct sadb_x_policy *pol;
df71837d
TJ		 2070 struct sadb_x_sec_ctx *sec_ctx;
2071 struct xfrm_sec_ctx *xfrm_ctx;
1da177e4
LT		 2072 int i;
2073 int size;
2074 int sockaddr_size = pfkey_sockaddr_size(xp->family);
9e8b4ed8 2075 int socklen = pfkey_sockaddr_len(xp->family);
1da177e4
LT		 2076
2077 size = pfkey_xfrm_policy2msg_size(xp);
2078
2079 /* call should fill header later */
4df864c1 2080 hdr = skb_put(skb, sizeof(struct sadb_msg));
1da177e4
LT		 2081 memset(hdr, 0, size); /* XXX do we need this ? */
2082
2083 /* src address */
4df864c1 2084 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
8ff24541 2085 addr->sadb_address_len =
1da177e4
LT		 2086 (sizeof(struct sadb_address)+sockaddr_size)/
2087 sizeof(uint64_t);
2088 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2089 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2090 addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
2091 addr->sadb_address_reserved = 0;
e5b56652
YH		 2092 if (!pfkey_sockaddr_fill(&xp->selector.saddr,
2093 xp->selector.sport,
2094 (struct sockaddr *) (addr + 1),
2095 xp->family))
1da177e4
LT		 2096 BUG();
2097
2098 /* dst address */
4df864c1 2099 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
1da177e4
LT		 2100 addr->sadb_address_len =
2101 (sizeof(struct sadb_address)+sockaddr_size)/
2102 sizeof(uint64_t);
2103 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2104 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
8ff24541 2105 addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
1da177e4 2106 addr->sadb_address_reserved = 0;
e5b56652
YH		 2107
2108 pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport,
2109 (struct sockaddr *) (addr + 1),
2110 xp->family);
1da177e4
LT		 2111
2112 /* hard time */
4df864c1 2113 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
1da177e4
LT		 2114 lifetime->sadb_lifetime_len =
2115 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2116 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2117 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.hard_packet_limit);
2118 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
2119 lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
2120 lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
2121 /* soft time */
4df864c1 2122 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
1da177e4
LT		 2123 lifetime->sadb_lifetime_len =
2124 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2125 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
2126 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.soft_packet_limit);
2127 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
2128 lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
2129 lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
2130 /* current time */
4df864c1 2131 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
1da177e4
LT		 2132 lifetime->sadb_lifetime_len =
2133 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2134 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2135 lifetime->sadb_lifetime_allocations = xp->curlft.packets;
2136 lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
2137 lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
2138 lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
2139
4df864c1 2140 pol = skb_put(skb, sizeof(struct sadb_x_policy));
1da177e4
LT		 2141 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2142 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2143 pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
2144 if (xp->action == XFRM_POLICY_ALLOW) {
2145 if (xp->xfrm_nr)
2146 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2147 else
2148 pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
2149 }
2150 pol->sadb_x_policy_dir = dir+1;
ff862a46 2151 pol->sadb_x_policy_reserved = 0;
1da177e4
LT		 2152 pol->sadb_x_policy_id = xp->index;
2153 pol->sadb_x_policy_priority = xp->priority;
2154
2155 for (i=0; i<xp->xfrm_nr; i++) {
4c93fbb0 2156 const struct xfrm_tmpl *t = xp->xfrm_vec + i;
1da177e4 2157 struct sadb_x_ipsecrequest *rq;
1da177e4 2158 int req_size;
55569ce2 2159 int mode;
1da177e4
LT		 2160
2161 req_size = sizeof(struct sadb_x_ipsecrequest);
e5b56652
YH		 2162 if (t->mode == XFRM_MODE_TUNNEL) {
2163 socklen = pfkey_sockaddr_len(t->encap_family);
2164 req_size += socklen * 2;
2165 } else {
1da177e4 2166 size -= 2*socklen;
e5b56652 2167 }
4df864c1 2168 rq = skb_put(skb, req_size);
1da177e4
LT		 2169 pol->sadb_x_policy_len += req_size/8;
2170 memset(rq, 0, sizeof(*rq));
2171 rq->sadb_x_ipsecrequest_len = req_size;
2172 rq->sadb_x_ipsecrequest_proto = t->id.proto;
55569ce2
KM		 2173 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0)
2174 return -EINVAL;
fefaa75e 2175 rq->sadb_x_ipsecrequest_mode = mode;
1da177e4
LT		 2176 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
2177 if (t->reqid)
2178 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2179 if (t->optional)
2180 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
2181 rq->sadb_x_ipsecrequest_reqid = t->reqid;
e5b56652 2182
7e49e6de 2183 if (t->mode == XFRM_MODE_TUNNEL) {
e5b56652
YH		 2184 u8 *sa = (void *)(rq + 1);
2185 pfkey_sockaddr_fill(&t->saddr, 0,
2186 (struct sockaddr *)sa,
2187 t->encap_family);
2188 pfkey_sockaddr_fill(&t->id.daddr, 0,
2189 (struct sockaddr *) (sa + socklen),
2190 t->encap_family);
1da177e4
LT		 2191 }
2192 }
df71837d
TJ		 2193
2194 /* security context */
2195 if ((xfrm_ctx = xp->security)) {
2196 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp);
2197
4df864c1 2198 sec_ctx = skb_put(skb, ctx_size);
df71837d
TJ		 2199 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t);
2200 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
2201 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
2202 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
2203 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
2204 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
2205 xfrm_ctx->ctx_len);
2206 }
2207
1da177e4 2208 hdr->sadb_msg_len = size / sizeof(uint64_t);
850a6212 2209 hdr->sadb_msg_reserved = refcount_read(&xp->refcnt);
55569ce2
KM		 2210
2211 return 0;
1da177e4
LT		 2212}
2213
214e005b 2214static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
26b15dad
JHS		 2215{
2216 struct sk_buff *out_skb;
2217 struct sadb_msg *out_hdr;
2218 int err;
2219
2220 out_skb = pfkey_xfrm_policy2msg_prep(xp);
9a127aad
DC		 2221 if (IS_ERR(out_skb))
2222 return PTR_ERR(out_skb);
2223
55569ce2 2224 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
1e532d2b
SK		 2225 if (err < 0) {
2226 kfree_skb(out_skb);
55569ce2 2227 return err;
1e532d2b 2228 }
26b15dad
JHS		 2229
2230 out_hdr = (struct sadb_msg *) out_skb->data;
2231 out_hdr->sadb_msg_version = PF_KEY_V2;
2232
f60f6b8f 2233 if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
26b15dad
JHS		 2234 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
2235 else
2236 out_hdr->sadb_msg_type = event2poltype(c->event);
2237 out_hdr->sadb_msg_errno = 0;
2238 out_hdr->sadb_msg_seq = c->seq;
15e47304 2239 out_hdr->sadb_msg_pid = c->portid;
36f41f8f 2240 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp));
26b15dad
JHS		 2241 return 0;
2242
2243}
2244
4c93fbb0 2245static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1da177e4 2246{
07fb0f17 2247 struct net *net = sock_net(sk);
df71837d 2248 int err = 0;
1da177e4
LT		 2249 struct sadb_lifetime *lifetime;
2250 struct sadb_address *sa;
2251 struct sadb_x_policy *pol;
2252 struct xfrm_policy *xp;
26b15dad 2253 struct km_event c;
df71837d 2254 struct sadb_x_sec_ctx *sec_ctx;
1da177e4
LT		 2255
2256 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2257 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2258 !ext_hdrs[SADB_X_EXT_POLICY-1])
2259 return -EINVAL;
2260
2261 pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2262 if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
2263 return -EINVAL;
2264 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2265 return -EINVAL;
2266
07fb0f17 2267 xp = xfrm_policy_alloc(net, GFP_KERNEL);
1da177e4
LT		 2268 if (xp == NULL)
2269 return -ENOBUFS;
2270
2271 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2272 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2273 xp->priority = pol->sadb_x_policy_priority;
2274
d0d79c3f 2275 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1da177e4 2276 xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
1da177e4
LT		 2277 xp->selector.family = xp->family;
2278 xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
2279 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2280 xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2281 if (xp->selector.sport)
8f83f23e 2282 xp->selector.sport_mask = htons(0xffff);
1da177e4 2283
d0d79c3f 2284 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1da177e4
LT		 2285 pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
2286 xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
2287
2288 /* Amusing, we set this twice. KAME apps appear to set same value
2289 * in both addresses.
2290 */
2291 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2292
2293 xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2294 if (xp->selector.dport)
8f83f23e 2295 xp->selector.dport_mask = htons(0xffff);
1da177e4 2296
ea110733 2297 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
df71837d 2298 if (sec_ctx != NULL) {
87536a81 2299 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
df71837d
TJ		 2300
2301 if (!uctx) {
2302 err = -ENOBUFS;
2303 goto out;
2304 }
2305
52a4c640 2306 err = security_xfrm_policy_alloc(&xp->security, uctx, GFP_KERNEL);
df71837d
TJ		 2307 kfree(uctx);
2308
2309 if (err)
2310 goto out;
2311 }
2312
1da177e4
LT		 2313 xp->lft.soft_byte_limit = XFRM_INF;
2314 xp->lft.hard_byte_limit = XFRM_INF;
2315 xp->lft.soft_packet_limit = XFRM_INF;
2316 xp->lft.hard_packet_limit = XFRM_INF;
2317 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
2318 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2319 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2320 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2321 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2322 }
2323 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
2324 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2325 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2326 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2327 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2328 }
2329 xp->xfrm_nr = 0;
2330 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2331 (err = parse_ipsecrequests(xp, pol)) < 0)
2332 goto out;
2333
1da177e4
LT		 2334 err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
2335 hdr->sadb_msg_type != SADB_X_SPDUPDATE);
df71837d 2336
2e71029e 2337 xfrm_audit_policy_add(xp, err ? 0 : 1, true);
161a09e7 2338
df71837d
TJ		 2339 if (err)
2340 goto out;
1da177e4 2341
26b15dad 2342 if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
f60f6b8f 2343 c.event = XFRM_MSG_UPDPOLICY;
8ff24541 2344 else
f60f6b8f 2345 c.event = XFRM_MSG_NEWPOLICY;
1da177e4 2346
26b15dad 2347 c.seq = hdr->sadb_msg_seq;
15e47304 2348 c.portid = hdr->sadb_msg_pid;
1da177e4 2349
26b15dad
JHS		 2350 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2351 xfrm_pol_put(xp);
1da177e4
LT		 2352 return 0;
2353
2354out:
12a169e7 2355 xp->walk.dead = 1;
64c31b3f 2356 xfrm_policy_destroy(xp);
1da177e4
LT		 2357 return err;
2358}
2359
4c93fbb0 2360static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1da177e4 2361{
07fb0f17 2362 struct net *net = sock_net(sk);
1da177e4
LT		 2363 int err;
2364 struct sadb_address *sa;
2365 struct sadb_x_policy *pol;
03e1ad7b 2366 struct xfrm_policy *xp;
1da177e4 2367 struct xfrm_selector sel;
26b15dad 2368 struct km_event c;
df71837d 2369 struct sadb_x_sec_ctx *sec_ctx;
2db3e47e 2370 struct xfrm_sec_ctx *pol_ctx = NULL;
1da177e4
LT		 2371
2372 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2373 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2374 !ext_hdrs[SADB_X_EXT_POLICY-1])
2375 return -EINVAL;
2376
2377 pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2378 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2379 return -EINVAL;
2380
2381 memset(&sel, 0, sizeof(sel));
2382
d0d79c3f 2383 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1da177e4
LT		 2384 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2385 sel.prefixlen_s = sa->sadb_address_prefixlen;
2386 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2387 sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2388 if (sel.sport)
8f83f23e 2389 sel.sport_mask = htons(0xffff);
1da177e4 2390
d0d79c3f 2391 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1da177e4
LT		 2392 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2393 sel.prefixlen_d = sa->sadb_address_prefixlen;
2394 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2395 sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2396 if (sel.dport)
8f83f23e 2397 sel.dport_mask = htons(0xffff);
1da177e4 2398
ea110733 2399 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
df71837d 2400 if (sec_ctx != NULL) {
87536a81 2401 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
df71837d
TJ		 2402
2403 if (!uctx)
2404 return -ENOMEM;
2405
52a4c640 2406 err = security_xfrm_policy_alloc(&pol_ctx, uctx, GFP_KERNEL);
df71837d 2407 kfree(uctx);
df71837d
TJ		 2408 if (err)
2409 return err;
2db3e47e 2410 }
161a09e7 2411
4f47e8ab 2412 xp = xfrm_policy_bysel_ctx(net, &dummy_mark, 0, XFRM_POLICY_TYPE_MAIN,
03e1ad7b
PM		 2413 pol->sadb_x_policy_dir - 1, &sel, pol_ctx,
2414 1, &err);
2415 security_xfrm_policy_free(pol_ctx);
1da177e4
LT		 2416 if (xp == NULL)
2417 return -ENOENT;
2418
2e71029e 2419 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
13fcfbb0
DM		 2420
2421 if (err)
c8c05a8e 2422 goto out;
13fcfbb0 2423
26b15dad 2424 c.seq = hdr->sadb_msg_seq;
15e47304 2425 c.portid = hdr->sadb_msg_pid;
1839faab 2426 c.data.byid = 0;
f60f6b8f 2427 c.event = XFRM_MSG_DELPOLICY;
26b15dad
JHS		 2428 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2429
c8c05a8e 2430out:
26b15dad
JHS		 2431 xfrm_pol_put(xp);
2432 return err;
2433}
2434
4c93fbb0 2435static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir)
26b15dad
JHS		 2436{
2437 int err;
2438 struct sk_buff *out_skb;
2439 struct sadb_msg *out_hdr;
2440 err = 0;
2441
1da177e4
LT		 2442 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2443 if (IS_ERR(out_skb)) {
2444 err = PTR_ERR(out_skb);
2445 goto out;
2446 }
55569ce2 2447 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
7c80eb1c
JS		 2448 if (err < 0) {
2449 kfree_skb(out_skb);
55569ce2 2450 goto out;
7c80eb1c 2451 }
1da177e4
LT		 2452
2453 out_hdr = (struct sadb_msg *) out_skb->data;
2454 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
26b15dad 2455 out_hdr->sadb_msg_type = hdr->sadb_msg_type;
1da177e4
LT		 2456 out_hdr->sadb_msg_satype = 0;
2457 out_hdr->sadb_msg_errno = 0;
2458 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2459 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
36f41f8f 2460 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp));
1da177e4
LT		 2461 err = 0;
2462
2463out:
1da177e4
LT		 2464 return err;
2465}
2466
08de61be
SS		 2467static int pfkey_sockaddr_pair_size(sa_family_t family)
2468{
9e8b4ed8 2469 return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
08de61be
SS		 2470}
2471
13c1d189 2472static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
08de61be
SS		 2473 xfrm_address_t *saddr, xfrm_address_t *daddr,
2474 u16 *family)
2475{
5f95ac91
YH		 2476 int af, socklen;
2477
096f41d3 2478 if (ext_len < 2 || ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
08de61be
SS		 2479 return -EINVAL;
2480
13c1d189 2481 af = pfkey_sockaddr_extract(sa, saddr);
5f95ac91
YH		 2482 if (!af)
2483 return -EINVAL;
2484
2485 socklen = pfkey_sockaddr_len(af);
13c1d189 2486 if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen),
5f95ac91 2487 daddr) != af)
08de61be 2488 return -EINVAL;
08de61be 2489
5f95ac91 2490 *family = af;
08de61be
SS		 2491 return 0;
2492}
2493
096f41d3 2494#ifdef CONFIG_NET_KEY_MIGRATE
08de61be
SS		 2495static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
2496 struct xfrm_migrate *m)
2497{
2498 int err;
2499 struct sadb_x_ipsecrequest *rq2;
55569ce2 2500 int mode;
08de61be 2501
096f41d3
HX		 2502 if (len < sizeof(*rq1) ||
2503 len < rq1->sadb_x_ipsecrequest_len ||
2504 rq1->sadb_x_ipsecrequest_len < sizeof(*rq1))
08de61be
SS		 2505 return -EINVAL;
2506
2507 /* old endoints */
13c1d189 2508 err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
096f41d3 2509 rq1->sadb_x_ipsecrequest_len - sizeof(*rq1),
13c1d189 2510 &m->old_saddr, &m->old_daddr,
08de61be
SS		 2511 &m->old_family);
2512 if (err)
2513 return err;
2514
2515 rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len);
2516 len -= rq1->sadb_x_ipsecrequest_len;
2517
096f41d3
HX		 2518 if (len <= sizeof(*rq2) ||
2519 len < rq2->sadb_x_ipsecrequest_len ||
2520 rq2->sadb_x_ipsecrequest_len < sizeof(*rq2))
08de61be
SS		 2521 return -EINVAL;
2522
2523 /* new endpoints */
13c1d189 2524 err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
096f41d3 2525 rq2->sadb_x_ipsecrequest_len - sizeof(*rq2),
13c1d189 2526 &m->new_saddr, &m->new_daddr,
08de61be
SS		 2527 &m->new_family);
2528 if (err)
2529 return err;
2530
2531 if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto ||
2532 rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode ||
2533 rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid)
2534 return -EINVAL;
2535
2536 m->proto = rq1->sadb_x_ipsecrequest_proto;
55569ce2
KM		 2537 if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
2538 return -EINVAL;
2539 m->mode = mode;
08de61be
SS		 2540 m->reqid = rq1->sadb_x_ipsecrequest_reqid;
2541
2542 return ((int)(rq1->sadb_x_ipsecrequest_len +
2543 rq2->sadb_x_ipsecrequest_len));
2544}
2545
2546static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
4c93fbb0 2547 const struct sadb_msg *hdr, void * const *ext_hdrs)
08de61be
SS		 2548{
2549 int i, len, ret, err = -EINVAL;
2550 u8 dir;
2551 struct sadb_address *sa;
13c1d189 2552 struct sadb_x_kmaddress *kma;
08de61be
SS		 2553 struct sadb_x_policy *pol;
2554 struct sadb_x_ipsecrequest *rq;
2555 struct xfrm_selector sel;
2556 struct xfrm_migrate m[XFRM_MAX_DEPTH];
13c1d189 2557 struct xfrm_kmaddress k;
8d549c4f 2558 struct net *net = sock_net(sk);
08de61be
SS		 2559
2560 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
13c1d189 2561 ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
08de61be
SS		 2562 !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
2563 err = -EINVAL;
2564 goto out;
2565 }
2566
13c1d189 2567 kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1];
08de61be 2568 pol = ext_hdrs[SADB_X_EXT_POLICY - 1];
08de61be
SS		 2569
2570 if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) {
2571 err = -EINVAL;
2572 goto out;
2573 }
2574
13c1d189
AE		 2575 if (kma) {
2576 /* convert sadb_x_kmaddress to xfrm_kmaddress */
2577 k.reserved = kma->sadb_x_kmaddress_reserved;
2578 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1),
2579 8*(kma->sadb_x_kmaddress_len) - sizeof(*kma),
2580 &k.local, &k.remote, &k.family);
2581 if (ret < 0) {
2582 err = ret;
2583 goto out;
2584 }
2585 }
2586
08de61be
SS		 2587 dir = pol->sadb_x_policy_dir - 1;
2588 memset(&sel, 0, sizeof(sel));
2589
2590 /* set source address info of selector */
2591 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1];
2592 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2593 sel.prefixlen_s = sa->sadb_address_prefixlen;
2594 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2595 sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2596 if (sel.sport)
582ee43d 2597 sel.sport_mask = htons(0xffff);
08de61be
SS		 2598
2599 /* set destination address info of selector */
47162c0b 2600 sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
08de61be
SS		 2601 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2602 sel.prefixlen_d = sa->sadb_address_prefixlen;
2603 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2604 sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2605 if (sel.dport)
582ee43d 2606 sel.dport_mask = htons(0xffff);
08de61be
SS		 2607
2608 rq = (struct sadb_x_ipsecrequest *)(pol + 1);
2609
2610 /* extract ipsecrequests */
2611 i = 0;
2612 len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy);
2613
2614 while (len > 0 && i < XFRM_MAX_DEPTH) {
2615 ret = ipsecrequests_to_migrate(rq, len, &m[i]);
2616 if (ret < 0) {
2617 err = ret;
2618 goto out;
2619 } else {
2620 rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret);
2621 len -= ret;
2622 i++;
2623 }
2624 }
2625
2626 if (!i || len > 0) {
2627 err = -EINVAL;
2628 goto out;
2629 }
2630
13c1d189 2631 return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
bd122403 2632 kma ? &k : NULL, net, NULL, 0, NULL);
08de61be
SS		 2633
2634 out:
2635 return err;
2636}
2637#else
2638static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
7f6daa63 2639 const struct sadb_msg *hdr, void * const *ext_hdrs)
08de61be
SS		 2640{
2641 return -ENOPROTOOPT;
2642}
2643#endif
2644
2645
4c93fbb0 2646static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1da177e4 2647{
07fb0f17 2648 struct net *net = sock_net(sk);
77d8d7a6 2649 unsigned int dir;
215a2dd3 2650 int err = 0, delete;
1da177e4
LT		 2651 struct sadb_x_policy *pol;
2652 struct xfrm_policy *xp;
26b15dad 2653 struct km_event c;
1da177e4
LT		 2654
2655 if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2656 return -EINVAL;
2657
77d8d7a6
HX		 2658 dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
2659 if (dir >= XFRM_POLICY_MAX)
2660 return -EINVAL;
2661
215a2dd3 2662 delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
4f47e8ab 2663 xp = xfrm_policy_byid(net, &dummy_mark, 0, XFRM_POLICY_TYPE_MAIN,
bd55775c 2664 dir, pol->sadb_x_policy_id, delete, &err);
1da177e4
LT		 2665 if (xp == NULL)
2666 return -ENOENT;
2667
215a2dd3 2668 if (delete) {
2e71029e 2669 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
1da177e4 2670
215a2dd3
EP		 2671 if (err)
2672 goto out;
2673 c.seq = hdr->sadb_msg_seq;
15e47304 2674 c.portid = hdr->sadb_msg_pid;
bf08867f 2675 c.data.byid = 1;
f60f6b8f 2676 c.event = XFRM_MSG_DELPOLICY;
77d8d7a6 2677 km_policy_notify(xp, dir, &c);
26b15dad 2678 } else {
77d8d7a6 2679 err = key_pol_get_resp(sk, xp, hdr, dir);
1da177e4 2680 }
1da177e4 2681
215a2dd3 2682out:
1da177e4
LT		 2683 xfrm_pol_put(xp);
2684 return err;
2685}
2686
2687static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2688{
83321d6b 2689 struct pfkey_sock *pfk = ptr;
1da177e4
LT		 2690 struct sk_buff *out_skb;
2691 struct sadb_msg *out_hdr;
55569ce2 2692 int err;
1da177e4 2693
83321d6b
TT		 2694 if (!pfkey_can_dump(&pfk->sk))
2695 return -ENOBUFS;
2696
1da177e4
LT		 2697 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2698 if (IS_ERR(out_skb))
2699 return PTR_ERR(out_skb);
2700
55569ce2 2701 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
7c80eb1c
JS		 2702 if (err < 0) {
2703 kfree_skb(out_skb);
55569ce2 2704 return err;
7c80eb1c 2705 }
1da177e4
LT		 2706
2707 out_hdr = (struct sadb_msg *) out_skb->data;
83321d6b 2708 out_hdr->sadb_msg_version = pfk->dump.msg_version;
1da177e4
LT		 2709 out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2710 out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2711 out_hdr->sadb_msg_errno = 0;
12a169e7 2712 out_hdr->sadb_msg_seq = count + 1;
15e47304 2713 out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
12a169e7
HX		 2714
2715 if (pfk->dump.skb)
36f41f8f 2716 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
07fb0f17 2717 &pfk->sk, sock_net(&pfk->sk));
12a169e7
HX		 2718 pfk->dump.skb = out_skb;
2719
1da177e4
LT		 2720 return 0;
2721}
2722
83321d6b
TT		 2723static int pfkey_dump_sp(struct pfkey_sock *pfk)
2724{
07fb0f17
AD		 2725 struct net *net = sock_net(&pfk->sk);
2726 return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk);
83321d6b
TT		 2727}
2728
2729static void pfkey_dump_sp_done(struct pfkey_sock *pfk)
2730{
283bc9f3
FD		 2731 struct net *net = sock_net((struct sock *)pfk);
2732
2733 xfrm_policy_walk_done(&pfk->dump.u.policy, net);
83321d6b
TT		 2734}
2735
4c93fbb0 2736static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1da177e4 2737{
83321d6b 2738 struct pfkey_sock *pfk = pfkey_sk(sk);
4c563f76 2739
89e357d8
YS		 2740 mutex_lock(&pfk->dump_lock);
2741 if (pfk->dump.dump != NULL) {
2742 mutex_unlock(&pfk->dump_lock);
83321d6b 2743 return -EBUSY;
89e357d8 2744 }
1da177e4 2745
83321d6b 2746 pfk->dump.msg_version = hdr->sadb_msg_version;
15e47304 2747 pfk->dump.msg_portid = hdr->sadb_msg_pid;
83321d6b
TT		 2748 pfk->dump.dump = pfkey_dump_sp;
2749 pfk->dump.done = pfkey_dump_sp_done;
2750 xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN);
89e357d8 2751 mutex_unlock(&pfk->dump_lock);
83321d6b
TT		 2752
2753 return pfkey_do_dump(pfk);
1da177e4
LT		 2754}
2755
214e005b 2756static int key_notify_policy_flush(const struct km_event *c)
1da177e4
LT		 2757{
2758 struct sk_buff *skb_out;
26b15dad 2759 struct sadb_msg *hdr;
1da177e4 2760
26b15dad 2761 skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1da177e4
LT		 2762 if (!skb_out)
2763 return -ENOBUFS;
4df864c1 2764 hdr = skb_put(skb_out, sizeof(struct sadb_msg));
151bb0ff 2765 hdr->sadb_msg_type = SADB_X_SPDFLUSH;
26b15dad 2766 hdr->sadb_msg_seq = c->seq;
15e47304 2767 hdr->sadb_msg_pid = c->portid;
26b15dad
JHS		 2768 hdr->sadb_msg_version = PF_KEY_V2;
2769 hdr->sadb_msg_errno = (uint8_t) 0;
85dfb745 2770 hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
26b15dad 2771 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
a5cc68f3 2772 hdr->sadb_msg_reserved = 0;
36f41f8f 2773 pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
26b15dad 2774 return 0;
1da177e4 2775
26b15dad
JHS		 2776}
2777
4c93fbb0 2778static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
26b15dad 2779{
07fb0f17 2780 struct net *net = sock_net(sk);
26b15dad 2781 struct km_event c;
8be987d7 2782 int err, err2;
1da177e4 2783
2e71029e 2784 err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, true);
8be987d7 2785 err2 = unicast_flush_resp(sk, hdr);
2f1eb65f
JHS		 2786 if (err || err2) {
2787 if (err == -ESRCH) /* empty table - old silent behavior */
2788 return 0;
2789 return err;
2790 }
8be987d7 2791
f7b6983f 2792 c.data.type = XFRM_POLICY_TYPE_MAIN;
f60f6b8f 2793 c.event = XFRM_MSG_FLUSHPOLICY;
15e47304 2794 c.portid = hdr->sadb_msg_pid;
26b15dad 2795 c.seq = hdr->sadb_msg_seq;
07fb0f17 2796 c.net = net;
26b15dad 2797 km_policy_notify(NULL, 0, &c);
1da177e4
LT		 2798
2799 return 0;
2800}
2801
2802typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
4c93fbb0 2803 const struct sadb_msg *hdr, void * const *ext_hdrs);
8603b955 2804static const pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
1da177e4
LT		 2805 [SADB_RESERVED] = pfkey_reserved,
2806 [SADB_GETSPI] = pfkey_getspi,
2807 [SADB_UPDATE] = pfkey_add,
2808 [SADB_ADD] = pfkey_add,
2809 [SADB_DELETE] = pfkey_delete,
2810 [SADB_GET] = pfkey_get,
2811 [SADB_ACQUIRE] = pfkey_acquire,
2812 [SADB_REGISTER] = pfkey_register,
2813 [SADB_EXPIRE] = NULL,
2814 [SADB_FLUSH] = pfkey_flush,
2815 [SADB_DUMP] = pfkey_dump,
2816 [SADB_X_PROMISC] = pfkey_promisc,
2817 [SADB_X_PCHANGE] = NULL,
2818 [SADB_X_SPDUPDATE] = pfkey_spdadd,
2819 [SADB_X_SPDADD] = pfkey_spdadd,
2820 [SADB_X_SPDDELETE] = pfkey_spddelete,
2821 [SADB_X_SPDGET] = pfkey_spdget,
2822 [SADB_X_SPDACQUIRE] = NULL,
2823 [SADB_X_SPDDUMP] = pfkey_spddump,
2824 [SADB_X_SPDFLUSH] = pfkey_spdflush,
2825 [SADB_X_SPDSETIDX] = pfkey_spdadd,
2826 [SADB_X_SPDDELETE2] = pfkey_spdget,
08de61be 2827 [SADB_X_MIGRATE] = pfkey_migrate,
1da177e4
LT		 2828};
2829
4c93fbb0 2830static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr)
1da177e4
LT		 2831{
2832 void *ext_hdrs[SADB_EXT_MAX];
2833 int err;
2834
9c90c9b3
MK		 2835 /* Non-zero return value of pfkey_broadcast() does not always signal
2836 * an error and even on an actual error we may still want to process
2837 * the message so rather ignore the return value.
2838 */
2839 pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
2840 BROADCAST_PROMISC_ONLY, NULL, sock_net(sk));
1da177e4
LT		 2841
2842 memset(ext_hdrs, 0, sizeof(ext_hdrs));
2843 err = parse_exthdrs(skb, hdr, ext_hdrs);
2844 if (!err) {
2845 err = -EOPNOTSUPP;
2846 if (pfkey_funcs[hdr->sadb_msg_type])
2847 err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2848 }
2849 return err;
2850}
2851
2852static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2853{
2854 struct sadb_msg *hdr = NULL;
2855
2856 if (skb->len < sizeof(*hdr)) {
2857 *errp = -EMSGSIZE;
2858 } else {
2859 hdr = (struct sadb_msg *) skb->data;
2860 if (hdr->sadb_msg_version != PF_KEY_V2 ||
2861 hdr->sadb_msg_reserved != 0 ||
2862 (hdr->sadb_msg_type <= SADB_RESERVED ||
2863 hdr->sadb_msg_type > SADB_MAX)) {
2864 hdr = NULL;
2865 *errp = -EINVAL;
2866 } else if (hdr->sadb_msg_len != (skb->len /
2867 sizeof(uint64_t)) ||
2868 hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2869 sizeof(uint64_t))) {
2870 hdr = NULL;
2871 *errp = -EMSGSIZE;
2872 } else {
2873 *errp = 0;
2874 }
2875 }
2876 return hdr;
2877}
2878
4c93fbb0
DM		 2879static inline int aalg_tmpl_set(const struct xfrm_tmpl *t,
2880 const struct xfrm_algo_desc *d)
1da177e4 2881{
f398035f
HX		 2882 unsigned int id = d->desc.sadb_alg_id;
2883
2884 if (id >= sizeof(t->aalgos) * 8)
2885 return 0;
2886
2887 return (t->aalgos >> id) & 1;
1da177e4
LT		 2888}
2889
4c93fbb0
DM		 2890static inline int ealg_tmpl_set(const struct xfrm_tmpl *t,
2891 const struct xfrm_algo_desc *d)
1da177e4 2892{
f398035f
HX		 2893 unsigned int id = d->desc.sadb_alg_id;
2894
2895 if (id >= sizeof(t->ealgos) * 8)
2896 return 0;
2897
2898 return (t->ealgos >> id) & 1;
1da177e4
LT		 2899}
2900
4c93fbb0 2901static int count_ah_combs(const struct xfrm_tmpl *t)
1da177e4
LT		 2902{
2903 int i, sz = 0;
2904
2905 for (i = 0; ; i++) {
4c93fbb0 2906 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1da177e4
LT		 2907 if (!aalg)
2908 break;
7e50f84c
JK		 2909 if (!aalg->pfkey_supported)
2910 continue;
7f57f816 2911 if (aalg_tmpl_set(t, aalg))
1da177e4
LT		 2912 sz += sizeof(struct sadb_comb);
2913 }
2914 return sz + sizeof(struct sadb_prop);
2915}
2916
4c93fbb0 2917static int count_esp_combs(const struct xfrm_tmpl *t)
1da177e4
LT		 2918{
2919 int i, k, sz = 0;
2920
2921 for (i = 0; ; i++) {
4c93fbb0 2922 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1da177e4
LT		 2923 if (!ealg)
2924 break;
8ff24541 2925
7e50f84c
JK		 2926 if (!ealg->pfkey_supported)
2927 continue;
2928
7f57f816 2929 if (!(ealg_tmpl_set(t, ealg)))
1da177e4 2930 continue;
8ff24541 2931
1da177e4 2932 for (k = 1; ; k++) {
4c93fbb0 2933 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
1da177e4
LT		 2934 if (!aalg)
2935 break;
8ff24541 2936
7e50f84c
JK		 2937 if (!aalg->pfkey_supported)
2938 continue;
2939
7f57f816 2940 if (aalg_tmpl_set(t, aalg))
1da177e4
LT		 2941 sz += sizeof(struct sadb_comb);
2942 }
2943 }
2944 return sz + sizeof(struct sadb_prop);
2945}
2946
7f57f816 2947static int dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
1da177e4
LT		 2948{
2949 struct sadb_prop *p;
7f57f816 2950 int sz = 0;
1da177e4
LT		 2951 int i;
2952
4df864c1 2953 p = skb_put(skb, sizeof(struct sadb_prop));
1da177e4
LT		 2954 p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2955 p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2956 p->sadb_prop_replay = 32;
2957 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2958
2959 for (i = 0; ; i++) {
4c93fbb0 2960 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1da177e4
LT		 2961 if (!aalg)
2962 break;
2963
7e50f84c
JK		 2964 if (!aalg->pfkey_supported)
2965 continue;
2966
1da177e4
LT		 2967 if (aalg_tmpl_set(t, aalg) && aalg->available) {
2968 struct sadb_comb *c;
b080db58 2969 c = skb_put_zero(skb, sizeof(struct sadb_comb));
1da177e4
LT		 2970 p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2971 c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2972 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2973 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2974 c->sadb_comb_hard_addtime = 24*60*60;
2975 c->sadb_comb_soft_addtime = 20*60*60;
2976 c->sadb_comb_hard_usetime = 8*60*60;
2977 c->sadb_comb_soft_usetime = 7*60*60;
7f57f816 2978 sz += sizeof(*c);
1da177e4
LT		 2979 }
2980 }
7f57f816
HX		 2981
2982 return sz + sizeof(*p);
1da177e4
LT		 2983}
2984
7f57f816 2985static int dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
1da177e4
LT		 2986{
2987 struct sadb_prop *p;
7f57f816 2988 int sz = 0;
1da177e4
LT		 2989 int i, k;
2990
4df864c1 2991 p = skb_put(skb, sizeof(struct sadb_prop));
1da177e4
LT		 2992 p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2993 p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2994 p->sadb_prop_replay = 32;
2995 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2996
2997 for (i=0; ; i++) {
4c93fbb0 2998 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1da177e4
LT		 2999 if (!ealg)
3000 break;
8ff24541 3001
7e50f84c
JK		 3002 if (!ealg->pfkey_supported)
3003 continue;
3004
1da177e4
LT		 3005 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
3006 continue;
8ff24541 3007
1da177e4
LT		 3008 for (k = 1; ; k++) {
3009 struct sadb_comb *c;
4c93fbb0 3010 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
1da177e4
LT		 3011 if (!aalg)
3012 break;
7e50f84c
JK		 3013 if (!aalg->pfkey_supported)
3014 continue;
1da177e4
LT		 3015 if (!(aalg_tmpl_set(t, aalg) && aalg->available))
3016 continue;
4df864c1 3017 c = skb_put(skb, sizeof(struct sadb_comb));
1da177e4
LT		 3018 memset(c, 0, sizeof(*c));
3019 p->sadb_prop_len += sizeof(struct sadb_comb)/8;
3020 c->sadb_comb_auth = aalg->desc.sadb_alg_id;
3021 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
3022 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
3023 c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
3024 c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
3025 c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
3026 c->sadb_comb_hard_addtime = 24*60*60;
3027 c->sadb_comb_soft_addtime = 20*60*60;
3028 c->sadb_comb_hard_usetime = 8*60*60;
3029 c->sadb_comb_soft_usetime = 7*60*60;
7f57f816 3030 sz += sizeof(*c);
1da177e4
LT		 3031 }
3032 }
7f57f816
HX		 3033
3034 return sz + sizeof(*p);
1da177e4
LT		 3035}
3036
214e005b 3037static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c)
26b15dad
JHS		 3038{
3039 return 0;
3040}
3041
214e005b 3042static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c)
1da177e4
LT		 3043{
3044 struct sk_buff *out_skb;
3045 struct sadb_msg *out_hdr;
26b15dad
JHS		 3046 int hard;
3047 int hsc;
3048
bf08867f 3049 hard = c->data.hard;
26b15dad
JHS		 3050 if (hard)
3051 hsc = 2;
3052 else
3053 hsc = 1;
1da177e4 3054
050f009e 3055 out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
1da177e4
LT		 3056 if (IS_ERR(out_skb))
3057 return PTR_ERR(out_skb);
3058
3059 out_hdr = (struct sadb_msg *) out_skb->data;
3060 out_hdr->sadb_msg_version = PF_KEY_V2;
3061 out_hdr->sadb_msg_type = SADB_EXPIRE;
3062 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3063 out_hdr->sadb_msg_errno = 0;
3064 out_hdr->sadb_msg_reserved = 0;
3065 out_hdr->sadb_msg_seq = 0;
3066 out_hdr->sadb_msg_pid = 0;
3067
36f41f8f
ED		 3068 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3069 xs_net(x));
1da177e4
LT		 3070 return 0;
3071}
3072
214e005b 3073static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c)
26b15dad 3074{
07fb0f17 3075 struct net *net = x ? xs_net(x) : c->net;
3fa87a32
AD		 3076 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3077
3078 if (atomic_read(&net_pfkey->socks_nr) == 0)
99c6f60e
JHS		 3079 return 0;
3080
26b15dad 3081 switch (c->event) {
f60f6b8f 3082 case XFRM_MSG_EXPIRE:
26b15dad 3083 return key_notify_sa_expire(x, c);
f60f6b8f
HX		 3084 case XFRM_MSG_DELSA:
3085 case XFRM_MSG_NEWSA:
3086 case XFRM_MSG_UPDSA:
26b15dad 3087 return key_notify_sa(x, c);
f60f6b8f 3088 case XFRM_MSG_FLUSHSA:
26b15dad 3089 return key_notify_sa_flush(c);
d51d081d
JHS		 3090 case XFRM_MSG_NEWAE: /* not yet supported */
3091 break;
26b15dad 3092 default:
207024b9 3093 pr_err("pfkey: Unknown SA event %d\n", c->event);
26b15dad
JHS		 3094 break;
3095 }
3096
3097 return 0;
3098}
3099
214e005b 3100static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
26b15dad 3101{
f7b6983f
MN		 3102 if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
3103 return 0;
3104
26b15dad 3105 switch (c->event) {
f60f6b8f 3106 case XFRM_MSG_POLEXPIRE:
26b15dad 3107 return key_notify_policy_expire(xp, c);
f60f6b8f
HX		 3108 case XFRM_MSG_DELPOLICY:
3109 case XFRM_MSG_NEWPOLICY:
3110 case XFRM_MSG_UPDPOLICY:
26b15dad 3111 return key_notify_policy(xp, dir, c);
f60f6b8f 3112 case XFRM_MSG_FLUSHPOLICY:
f7b6983f
MN		 3113 if (c->data.type != XFRM_POLICY_TYPE_MAIN)
3114 break;
26b15dad
JHS		 3115 return key_notify_policy_flush(c);
3116 default:
207024b9 3117 pr_err("pfkey: Unknown policy event %d\n", c->event);
26b15dad
JHS		 3118 break;
3119 }
3120
3121 return 0;
3122}
3123
1da177e4
LT		 3124static u32 get_acqseq(void)
3125{
3126 u32 res;
28aecb9d 3127 static atomic_t acqseq;
1da177e4 3128
28aecb9d
ED		 3129 do {
3130 res = atomic_inc_return(&acqseq);
3131 } while (!res);
1da177e4
LT		 3132 return res;
3133}
3134
0f24558e
HG		 3135static bool pfkey_is_alive(const struct km_event *c)
3136{
3137 struct netns_pfkey *net_pfkey = net_generic(c->net, pfkey_net_id);
3138 struct sock *sk;
3139 bool is_alive = false;
3140
3141 rcu_read_lock();
3142 sk_for_each_rcu(sk, &net_pfkey->table) {
3143 if (pfkey_sk(sk)->registered) {
3144 is_alive = true;
3145 break;
3146 }
3147 }
3148 rcu_read_unlock();
3149
3150 return is_alive;
3151}
3152
65e0736b 3153static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp)
1da177e4
LT		 3154{
3155 struct sk_buff *skb;
3156 struct sadb_msg *hdr;
3157 struct sadb_address *addr;
3158 struct sadb_x_policy *pol;
1da177e4
LT		 3159 int sockaddr_size;
3160 int size;
4e2ba18e
VY		 3161 struct sadb_x_sec_ctx *sec_ctx;
3162 struct xfrm_sec_ctx *xfrm_ctx;
3163 int ctx_size = 0;
7f57f816 3164 int alg_size = 0;
8ff24541 3165
1da177e4
LT		 3166 sockaddr_size = pfkey_sockaddr_size(x->props.family);
3167 if (!sockaddr_size)
3168 return -EINVAL;
3169
3170 size = sizeof(struct sadb_msg) +
3171 (sizeof(struct sadb_address) * 2) +
3172 (sockaddr_size * 2) +
3173 sizeof(struct sadb_x_policy);
8ff24541 3174
1da177e4 3175 if (x->id.proto == IPPROTO_AH)
7f57f816 3176 alg_size = count_ah_combs(t);
1da177e4 3177 else if (x->id.proto == IPPROTO_ESP)
7f57f816 3178 alg_size = count_esp_combs(t);
1da177e4 3179
4e2ba18e
VY		 3180 if ((xfrm_ctx = x->security)) {
3181 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
3182 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
3183 }
3184
7f57f816 3185 skb = alloc_skb(size + alg_size + 16, GFP_ATOMIC);
1da177e4
LT		 3186 if (skb == NULL)
3187 return -ENOMEM;
8ff24541 3188
4df864c1 3189 hdr = skb_put(skb, sizeof(struct sadb_msg));
1da177e4
LT		 3190 hdr->sadb_msg_version = PF_KEY_V2;
3191 hdr->sadb_msg_type = SADB_ACQUIRE;
3192 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3193 hdr->sadb_msg_len = size / sizeof(uint64_t);
3194 hdr->sadb_msg_errno = 0;
3195 hdr->sadb_msg_reserved = 0;
3196 hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3197 hdr->sadb_msg_pid = 0;
3198
3199 /* src address */
4df864c1 3200 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
8ff24541 3201 addr->sadb_address_len =
1da177e4
LT		 3202 (sizeof(struct sadb_address)+sockaddr_size)/
3203 sizeof(uint64_t);
3204 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3205 addr->sadb_address_proto = 0;
3206 addr->sadb_address_reserved = 0;
e5b56652
YH		 3207 addr->sadb_address_prefixlen =
3208 pfkey_sockaddr_fill(&x->props.saddr, 0,
3209 (struct sockaddr *) (addr + 1),
3210 x->props.family);
3211 if (!addr->sadb_address_prefixlen)
1da177e4 3212 BUG();
8ff24541 3213
1da177e4 3214 /* dst address */
4df864c1 3215 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
1da177e4
LT		 3216 addr->sadb_address_len =
3217 (sizeof(struct sadb_address)+sockaddr_size)/
3218 sizeof(uint64_t);
3219 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3220 addr->sadb_address_proto = 0;
3221 addr->sadb_address_reserved = 0;
e5b56652
YH		 3222 addr->sadb_address_prefixlen =
3223 pfkey_sockaddr_fill(&x->id.daddr, 0,
3224 (struct sockaddr *) (addr + 1),
3225 x->props.family);
3226 if (!addr->sadb_address_prefixlen)
1da177e4
LT		 3227 BUG();
3228
4df864c1 3229 pol = skb_put(skb, sizeof(struct sadb_x_policy));
1da177e4
LT		 3230 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
3231 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3232 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
65e0736b 3233 pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1;
ff862a46 3234 pol->sadb_x_policy_reserved = 0;
1da177e4 3235 pol->sadb_x_policy_id = xp->index;
ff862a46 3236 pol->sadb_x_policy_priority = xp->priority;
1da177e4
LT		 3237
3238 /* Set sadb_comb's. */
7f57f816 3239 alg_size = 0;
1da177e4 3240 if (x->id.proto == IPPROTO_AH)
7f57f816 3241 alg_size = dump_ah_combs(skb, t);
1da177e4 3242 else if (x->id.proto == IPPROTO_ESP)
7f57f816
HX		 3243 alg_size = dump_esp_combs(skb, t);
3244
3245 hdr->sadb_msg_len += alg_size / 8;
1da177e4 3246
4e2ba18e
VY		 3247 /* security context */
3248 if (xfrm_ctx) {
4df864c1
JB		 3249 sec_ctx = skb_put(skb,
3250 sizeof(struct sadb_x_sec_ctx) + ctx_size);
4e2ba18e
VY		 3251 sec_ctx->sadb_x_sec_len =
3252 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
3253 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
3254 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
3255 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
3256 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
3257 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
3258 xfrm_ctx->ctx_len);
3259 }
3260
36f41f8f
ED		 3261 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3262 xs_net(x));
1da177e4
LT		 3263}
3264
cb969f07 3265static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
8ff24541 3266 u8 *data, int len, int *dir)
1da177e4 3267{
07fb0f17 3268 struct net *net = sock_net(sk);
1da177e4
LT		 3269 struct xfrm_policy *xp;
3270 struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
df71837d 3271 struct sadb_x_sec_ctx *sec_ctx;
1da177e4 3272
cb969f07 3273 switch (sk->sk_family) {
1da177e4
LT		 3274 case AF_INET:
3275 if (opt != IP_IPSEC_POLICY) {
3276 *dir = -EOPNOTSUPP;
3277 return NULL;
3278 }
3279 break;
dfd56b8b 3280#if IS_ENABLED(CONFIG_IPV6)
1da177e4
LT		 3281 case AF_INET6:
3282 if (opt != IPV6_IPSEC_POLICY) {
3283 *dir = -EOPNOTSUPP;
3284 return NULL;
3285 }
3286 break;
3287#endif
3288 default:
3289 *dir = -EINVAL;
3290 return NULL;
3291 }
3292
3293 *dir = -EINVAL;
3294
3295 if (len < sizeof(struct sadb_x_policy) ||
3296 pol->sadb_x_policy_len*8 > len ||
3297 pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
3298 (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
3299 return NULL;
3300
07fb0f17 3301 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
1da177e4
LT		 3302 if (xp == NULL) {
3303 *dir = -ENOBUFS;
3304 return NULL;
3305 }
3306
3307 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
3308 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
3309
3310 xp->lft.soft_byte_limit = XFRM_INF;
3311 xp->lft.hard_byte_limit = XFRM_INF;
3312 xp->lft.soft_packet_limit = XFRM_INF;
3313 xp->lft.hard_packet_limit = XFRM_INF;
cb969f07 3314 xp->family = sk->sk_family;
1da177e4
LT		 3315
3316 xp->xfrm_nr = 0;
3317 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
3318 (*dir = parse_ipsecrequests(xp, pol)) < 0)
3319 goto out;
3320
df71837d
TJ		 3321 /* security context too */
3322 if (len >= (pol->sadb_x_policy_len*8 +
3323 sizeof(struct sadb_x_sec_ctx))) {
3324 char *p = (char *)pol;
3325 struct xfrm_user_sec_ctx *uctx;
3326
3327 p += pol->sadb_x_policy_len*8;
3328 sec_ctx = (struct sadb_x_sec_ctx *)p;
3329 if (len < pol->sadb_x_policy_len*8 +
d90c9024 3330 sec_ctx->sadb_x_sec_len*8) {
cb969f07 3331 *dir = -EINVAL;
df71837d 3332 goto out;
cb969f07 3333 }
df71837d
TJ		 3334 if ((*dir = verify_sec_ctx_len(p)))
3335 goto out;
87536a81 3336 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_ATOMIC);
52a4c640 3337 *dir = security_xfrm_policy_alloc(&xp->security, uctx, GFP_ATOMIC);
df71837d
TJ		 3338 kfree(uctx);
3339
3340 if (*dir)
3341 goto out;
3342 }
3343
1da177e4
LT		 3344 *dir = pol->sadb_x_policy_dir-1;
3345 return xp;
3346
3347out:
70e90679 3348 xp->walk.dead = 1;
64c31b3f 3349 xfrm_policy_destroy(xp);
1da177e4
LT		 3350 return NULL;
3351}
3352
5d36b180 3353static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
1da177e4
LT		 3354{
3355 struct sk_buff *skb;
3356 struct sadb_msg *hdr;
3357 struct sadb_sa *sa;
3358 struct sadb_address *addr;
3359 struct sadb_x_nat_t_port *n_port;
1da177e4
LT		 3360 int sockaddr_size;
3361 int size;
3362 __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
3363 struct xfrm_encap_tmpl *natt = NULL;
3364
3365 sockaddr_size = pfkey_sockaddr_size(x->props.family);
3366 if (!sockaddr_size)
3367 return -EINVAL;
3368
3369 if (!satype)
3370 return -EINVAL;
3371
3372 if (!x->encap)
3373 return -EINVAL;
3374
3375 natt = x->encap;
3376
3377 /* Build an SADB_X_NAT_T_NEW_MAPPING message:
3378 *
3379 * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
3380 * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
3381 */
8ff24541 3382
1da177e4
LT		 3383 size = sizeof(struct sadb_msg) +
3384 sizeof(struct sadb_sa) +
3385 (sizeof(struct sadb_address) * 2) +
3386 (sockaddr_size * 2) +
3387 (sizeof(struct sadb_x_nat_t_port) * 2);
8ff24541 3388
1da177e4
LT		 3389 skb = alloc_skb(size + 16, GFP_ATOMIC);
3390 if (skb == NULL)
3391 return -ENOMEM;
8ff24541 3392
4df864c1 3393 hdr = skb_put(skb, sizeof(struct sadb_msg));
1da177e4
LT		 3394 hdr->sadb_msg_version = PF_KEY_V2;
3395 hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
3396 hdr->sadb_msg_satype = satype;
3397 hdr->sadb_msg_len = size / sizeof(uint64_t);
3398 hdr->sadb_msg_errno = 0;
3399 hdr->sadb_msg_reserved = 0;
b97df039 3400 hdr->sadb_msg_seq = x->km.seq;
1da177e4
LT		 3401 hdr->sadb_msg_pid = 0;
3402
3403 /* SA */
4df864c1 3404 sa = skb_put(skb, sizeof(struct sadb_sa));
1da177e4
LT		 3405 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
3406 sa->sadb_sa_exttype = SADB_EXT_SA;
3407 sa->sadb_sa_spi = x->id.spi;
3408 sa->sadb_sa_replay = 0;
3409 sa->sadb_sa_state = 0;
3410 sa->sadb_sa_auth = 0;
3411 sa->sadb_sa_encrypt = 0;
3412 sa->sadb_sa_flags = 0;
3413
3414 /* ADDRESS_SRC (old addr) */
4df864c1 3415 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
8ff24541 3416 addr->sadb_address_len =
1da177e4
LT		 3417 (sizeof(struct sadb_address)+sockaddr_size)/
3418 sizeof(uint64_t);
3419 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3420 addr->sadb_address_proto = 0;
3421 addr->sadb_address_reserved = 0;
e5b56652
YH		 3422 addr->sadb_address_prefixlen =
3423 pfkey_sockaddr_fill(&x->props.saddr, 0,
3424 (struct sockaddr *) (addr + 1),
3425 x->props.family);
3426 if (!addr->sadb_address_prefixlen)
1da177e4
LT		 3427 BUG();
3428
3429 /* NAT_T_SPORT (old port) */
4df864c1 3430 n_port = skb_put(skb, sizeof(*n_port));
1da177e4
LT		 3431 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3432 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
3433 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
3434 n_port->sadb_x_nat_t_port_reserved = 0;
3435
3436 /* ADDRESS_DST (new addr) */
4df864c1 3437 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
8ff24541 3438 addr->sadb_address_len =
1da177e4
LT		 3439 (sizeof(struct sadb_address)+sockaddr_size)/
3440 sizeof(uint64_t);
3441 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3442 addr->sadb_address_proto = 0;
3443 addr->sadb_address_reserved = 0;
e5b56652
YH		 3444 addr->sadb_address_prefixlen =
3445 pfkey_sockaddr_fill(ipaddr, 0,
3446 (struct sockaddr *) (addr + 1),
3447 x->props.family);
3448 if (!addr->sadb_address_prefixlen)
1da177e4
LT		 3449 BUG();
3450
3451 /* NAT_T_DPORT (new port) */
4df864c1 3452 n_port = skb_put(skb, sizeof(*n_port));
1da177e4
LT		 3453 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3454 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
3455 n_port->sadb_x_nat_t_port_port = sport;
3456 n_port->sadb_x_nat_t_port_reserved = 0;
3457
36f41f8f
ED		 3458 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3459 xs_net(x));
1da177e4
LT		 3460}
3461
08de61be
SS		 3462#ifdef CONFIG_NET_KEY_MIGRATE
3463static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
183cad12 3464 const struct xfrm_selector *sel)
08de61be
SS		 3465{
3466 struct sadb_address *addr;
4df864c1 3467 addr = skb_put(skb, sizeof(struct sadb_address) + sasize);
08de61be
SS		 3468 addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8;
3469 addr->sadb_address_exttype = type;
3470 addr->sadb_address_proto = sel->proto;
3471 addr->sadb_address_reserved = 0;
3472
3473 switch (type) {
3474 case SADB_EXT_ADDRESS_SRC:
e5b56652
YH		 3475 addr->sadb_address_prefixlen = sel->prefixlen_s;
3476 pfkey_sockaddr_fill(&sel->saddr, 0,
3477 (struct sockaddr *)(addr + 1),
3478 sel->family);
08de61be
SS		 3479 break;
3480 case SADB_EXT_ADDRESS_DST:
e5b56652
YH		 3481 addr->sadb_address_prefixlen = sel->prefixlen_d;
3482 pfkey_sockaddr_fill(&sel->daddr, 0,
3483 (struct sockaddr *)(addr + 1),
3484 sel->family);
08de61be
SS		 3485 break;
3486 default:
3487 return -EINVAL;
3488 }
3489
3490 return 0;
3491}
3492
13c1d189 3493
183cad12 3494static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k)
13c1d189
AE		 3495{
3496 struct sadb_x_kmaddress *kma;
3497 u8 *sa;
3498 int family = k->family;
3499 int socklen = pfkey_sockaddr_len(family);
3500 int size_req;
3501
3502 size_req = (sizeof(struct sadb_x_kmaddress) +
3503 pfkey_sockaddr_pair_size(family));
3504
b080db58 3505 kma = skb_put_zero(skb, size_req);
13c1d189
AE		 3506 kma->sadb_x_kmaddress_len = size_req / 8;
3507 kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS;
3508 kma->sadb_x_kmaddress_reserved = k->reserved;
3509
3510 sa = (u8 *)(kma + 1);
3511 if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) ||
3512 !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family))
3513 return -EINVAL;
3514
3515 return 0;
3516}
3517
08de61be
SS		 3518static int set_ipsecrequest(struct sk_buff *skb,
3519 uint8_t proto, uint8_t mode, int level,
3520 uint32_t reqid, uint8_t family,
183cad12 3521 const xfrm_address_t *src, const xfrm_address_t *dst)
08de61be
SS		 3522{
3523 struct sadb_x_ipsecrequest *rq;
e5b56652
YH		 3524 u8 *sa;
3525 int socklen = pfkey_sockaddr_len(family);
08de61be
SS		 3526 int size_req;
3527
3528 size_req = sizeof(struct sadb_x_ipsecrequest) +
3529 pfkey_sockaddr_pair_size(family);
3530
b080db58 3531 rq = skb_put_zero(skb, size_req);
08de61be
SS		 3532 rq->sadb_x_ipsecrequest_len = size_req;
3533 rq->sadb_x_ipsecrequest_proto = proto;
3534 rq->sadb_x_ipsecrequest_mode = mode;
3535 rq->sadb_x_ipsecrequest_level = level;
3536 rq->sadb_x_ipsecrequest_reqid = reqid;
3537
e5b56652
YH		 3538 sa = (u8 *) (rq + 1);
3539 if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) ||
3540 !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family))
08de61be 3541 return -EINVAL;
08de61be
SS		 3542
3543 return 0;
3544}
3545#endif
3546
3547#ifdef CONFIG_NET_KEY_MIGRATE
183cad12
DM		 3548static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3549 const struct xfrm_migrate *m, int num_bundles,
8bafd730
AA		 3550 const struct xfrm_kmaddress *k,
3551 const struct xfrm_encap_tmpl *encap)
08de61be
SS		 3552{
3553 int i;
3554 int sasize_sel;
3555 int size = 0;
3556 int size_pol = 0;
3557 struct sk_buff *skb;
3558 struct sadb_msg *hdr;
3559 struct sadb_x_policy *pol;
183cad12 3560 const struct xfrm_migrate *mp;
08de61be
SS		 3561
3562 if (type != XFRM_POLICY_TYPE_MAIN)
3563 return 0;
3564
3565 if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH)
3566 return -EINVAL;
3567
13c1d189
AE		 3568 if (k != NULL) {
3569 /* addresses for KM */
3570 size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) +
3571 pfkey_sockaddr_pair_size(k->family));
3572 }
3573
08de61be
SS		 3574 /* selector */
3575 sasize_sel = pfkey_sockaddr_size(sel->family);
3576 if (!sasize_sel)
3577 return -EINVAL;
3578 size += (sizeof(struct sadb_address) + sasize_sel) * 2;
3579
3580 /* policy info */
3581 size_pol += sizeof(struct sadb_x_policy);
3582
3583 /* ipsecrequests */
3584 for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3585 /* old locator pair */
3586 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3587 pfkey_sockaddr_pair_size(mp->old_family);
3588 /* new locator pair */
3589 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3590 pfkey_sockaddr_pair_size(mp->new_family);
3591 }
3592
3593 size += sizeof(struct sadb_msg) + size_pol;
3594
3595 /* alloc buffer */
3596 skb = alloc_skb(size, GFP_ATOMIC);
3597 if (skb == NULL)
3598 return -ENOMEM;
3599
4df864c1 3600 hdr = skb_put(skb, sizeof(struct sadb_msg));
08de61be
SS		 3601 hdr->sadb_msg_version = PF_KEY_V2;
3602 hdr->sadb_msg_type = SADB_X_MIGRATE;
3603 hdr->sadb_msg_satype = pfkey_proto2satype(m->proto);
3604 hdr->sadb_msg_len = size / 8;
3605 hdr->sadb_msg_errno = 0;
3606 hdr->sadb_msg_reserved = 0;
3607 hdr->sadb_msg_seq = 0;
3608 hdr->sadb_msg_pid = 0;
3609
13c1d189
AE		 3610 /* Addresses to be used by KM for negotiation, if ext is available */
3611 if (k != NULL && (set_sadb_kmaddress(skb, k) < 0))
89eb06f1 3612 goto err;
13c1d189 3613
08de61be
SS		 3614 /* selector src */
3615 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel);
3616
3617 /* selector dst */
3618 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel);
3619
3620 /* policy information */
4df864c1 3621 pol = skb_put(skb, sizeof(struct sadb_x_policy));
08de61be
SS		 3622 pol->sadb_x_policy_len = size_pol / 8;
3623 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3624 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3625 pol->sadb_x_policy_dir = dir + 1;
ff862a46 3626 pol->sadb_x_policy_reserved = 0;
08de61be
SS		 3627 pol->sadb_x_policy_id = 0;
3628 pol->sadb_x_policy_priority = 0;
3629
3630 for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3631 /* old ipsecrequest */
55569ce2
KM		 3632 int mode = pfkey_mode_from_xfrm(mp->mode);
3633 if (mode < 0)
d4782c32 3634 goto err;
55569ce2 3635 if (set_ipsecrequest(skb, mp->proto, mode,
08de61be
SS		 3636 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3637 mp->reqid, mp->old_family,
d4782c32
PM		 3638 &mp->old_saddr, &mp->old_daddr) < 0)
3639 goto err;
08de61be
SS		 3640
3641 /* new ipsecrequest */
55569ce2 3642 if (set_ipsecrequest(skb, mp->proto, mode,
08de61be
SS		 3643 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3644 mp->reqid, mp->new_family,
d4782c32
PM		 3645 &mp->new_saddr, &mp->new_daddr) < 0)
3646 goto err;
08de61be
SS		 3647 }
3648
3649 /* broadcast migrate message to sockets */
36f41f8f 3650 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net);
08de61be
SS		 3651
3652 return 0;
d4782c32
PM		 3653
3654err:
3655 kfree_skb(skb);
3656 return -EINVAL;
08de61be
SS		 3657}
3658#else
183cad12
DM		 3659static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3660 const struct xfrm_migrate *m, int num_bundles,
8bafd730
AA		 3661 const struct xfrm_kmaddress *k,
3662 const struct xfrm_encap_tmpl *encap)
08de61be
SS		 3663{
3664 return -ENOPROTOOPT;
3665}
3666#endif
3667
1b784140 3668static int pfkey_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1da177e4
LT		 3669{
3670 struct sock *sk = sock->sk;
3671 struct sk_buff *skb = NULL;
3672 struct sadb_msg *hdr = NULL;
3673 int err;
283bc9f3 3674 struct net *net = sock_net(sk);
1da177e4
LT		 3675
3676 err = -EOPNOTSUPP;
3677 if (msg->msg_flags & MSG_OOB)
3678 goto out;
3679
3680 err = -EMSGSIZE;
95c96174 3681 if ((unsigned int)len > sk->sk_sndbuf - 32)
1da177e4
LT		 3682 goto out;
3683
3684 err = -ENOBUFS;
3685 skb = alloc_skb(len, GFP_KERNEL);
3686 if (skb == NULL)
3687 goto out;
3688
3689 err = -EFAULT;
6ce8e9ce 3690 if (memcpy_from_msg(skb_put(skb,len), msg, len))
1da177e4
LT		 3691 goto out;
3692
3693 hdr = pfkey_get_base_msg(skb, &err);
3694 if (!hdr)
3695 goto out;
3696
283bc9f3 3697 mutex_lock(&net->xfrm.xfrm_cfg_mutex);
1da177e4 3698 err = pfkey_process(sk, skb, hdr);
283bc9f3 3699 mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
1da177e4
LT		 3700
3701out:
3702 if (err && hdr && pfkey_error(hdr, err, sk) == 0)
3703 err = 0;
6f961068 3704 kfree_skb(skb);
1da177e4
LT		 3705
3706 return err ? : len;
3707}
3708
1b784140 3709static int pfkey_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
1da177e4
LT		 3710 int flags)
3711{
3712 struct sock *sk = sock->sk;
83321d6b 3713 struct pfkey_sock *pfk = pfkey_sk(sk);
1da177e4
LT		 3714 struct sk_buff *skb;
3715 int copied, err;
3716
3717 err = -EINVAL;
3718 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
3719 goto out;
3720
f4b41f06 3721 skb = skb_recv_datagram(sk, flags, &err);
1da177e4
LT		 3722 if (skb == NULL)
3723 goto out;
3724
3725 copied = skb->len;
3726 if (copied > len) {
3727 msg->msg_flags |= MSG_TRUNC;
3728 copied = len;
3729 }
3730
badff6d0 3731 skb_reset_transport_header(skb);
51f3d02b 3732 err = skb_copy_datagram_msg(skb, 0, msg, copied);
1da177e4
LT		 3733 if (err)
3734 goto out_free;
3735
6fd1d51c 3736 sock_recv_cmsgs(msg, sk, skb);
1da177e4
LT		 3737
3738 err = (flags & MSG_TRUNC) ? skb->len : copied;
3739
83321d6b
TT		 3740 if (pfk->dump.dump != NULL &&
3741 3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf)
3742 pfkey_do_dump(pfk);
3743
1da177e4
LT		 3744out_free:
3745 skb_free_datagram(sk, skb);
3746out:
3747 return err;
3748}
3749
90ddc4f0 3750static const struct proto_ops pfkey_ops = {
1da177e4
LT		 3751 .family = PF_KEY,
3752 .owner = THIS_MODULE,
3753 /* Operations that make no sense on pfkey sockets. */
3754 .bind = sock_no_bind,
3755 .connect = sock_no_connect,
3756 .socketpair = sock_no_socketpair,
3757 .accept = sock_no_accept,
3758 .getname = sock_no_getname,
3759 .ioctl = sock_no_ioctl,
3760 .listen = sock_no_listen,
3761 .shutdown = sock_no_shutdown,
1da177e4 3762 .mmap = sock_no_mmap,
1da177e4
LT		 3763
3764 /* Now the operations that really occur. */
3765 .release = pfkey_release,
a11e1d43 3766 .poll = datagram_poll,
1da177e4
LT		 3767 .sendmsg = pfkey_sendmsg,
3768 .recvmsg = pfkey_recvmsg,
3769};
3770
ec1b4cf7 3771static const struct net_proto_family pfkey_family_ops = {
1da177e4
LT		 3772 .family = PF_KEY,
3773 .create = pfkey_create,
3774 .owner = THIS_MODULE,
3775};
3776
3777#ifdef CONFIG_PROC_FS
bd2f7476 3778static int pfkey_seq_show(struct seq_file *f, void *v)
1da177e4 3779{
27b5b865 3780 struct sock *s = sk_entry(v);
1da177e4 3781
bd2f7476
PE		 3782 if (v == SEQ_START_TOKEN)
3783 seq_printf(f ,"sk RefCnt Rmem Wmem User Inode\n");
3784 else
71338aa7 3785 seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n",
1da177e4 3786 s,
41c6d650 3787 refcount_read(&s->sk_refcnt),
31e6d363
ED		 3788 sk_rmem_alloc_get(s),
3789 sk_wmem_alloc_get(s),
a7cb5a49 3790 from_kuid_munged(seq_user_ns(f), sock_i_uid(s)),
1da177e4
LT		 3791 sock_i_ino(s)
3792 );
bd2f7476
PE		 3793 return 0;
3794}
3795
3796static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos)
ada440e3 3797 __acquires(rcu)
bd2f7476 3798{
7013ec30 3799 struct net *net = seq_file_net(f);
3fa87a32 3800 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
1da177e4 3801
7f6b9dbd 3802 rcu_read_lock();
3803 return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos);
bd2f7476
PE		 3804}
3805
3806static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos)
3807{
7013ec30 3808 struct net *net = seq_file_net(f);
3fa87a32
AD		 3809 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3810
7f6b9dbd 3811 return seq_hlist_next_rcu(v, &net_pfkey->table, ppos);
bd2f7476 3812}
1da177e4 3813
bd2f7476 3814static void pfkey_seq_stop(struct seq_file *f, void *v)
ada440e3 3815 __releases(rcu)
bd2f7476 3816{
7f6b9dbd 3817 rcu_read_unlock();
bd2f7476 3818}
1da177e4 3819
98147d52 3820static const struct seq_operations pfkey_seq_ops = {
bd2f7476
PE		 3821 .start = pfkey_seq_start,
3822 .next = pfkey_seq_next,
3823 .stop = pfkey_seq_stop,
3824 .show = pfkey_seq_show,
3825};
1da177e4 3826
7013ec30 3827static int __net_init pfkey_init_proc(struct net *net)
61145aa1 3828{
bd2f7476
PE		 3829 struct proc_dir_entry *e;
3830
c3506372
CH		 3831 e = proc_create_net("pfkey", 0, net->proc_net, &pfkey_seq_ops,
3832 sizeof(struct seq_net_private));
bd2f7476 3833 if (e == NULL)
61145aa1 3834 return -ENOMEM;
bd2f7476 3835
bd2f7476 3836 return 0;
61145aa1
PE		 3837}
3838
2c8c1e72 3839static void __net_exit pfkey_exit_proc(struct net *net)
61145aa1 3840{
ece31ffd 3841 remove_proc_entry("pfkey", net->proc_net);
61145aa1
PE		 3842}
3843#else
2c8c1e72 3844static inline int pfkey_init_proc(struct net *net)
61145aa1
PE		 3845{
3846 return 0;
3847}
3848
2c8c1e72 3849static inline void pfkey_exit_proc(struct net *net)
61145aa1
PE		 3850{
3851}
1da177e4
LT		 3852#endif
3853
3854static struct xfrm_mgr pfkeyv2_mgr =
3855{
1da177e4
LT		 3856 .notify = pfkey_send_notify,
3857 .acquire = pfkey_send_acquire,
3858 .compile_policy = pfkey_compile_policy,
3859 .new_mapping = pfkey_send_new_mapping,
26b15dad 3860 .notify_policy = pfkey_send_policy_notify,
08de61be 3861 .migrate = pfkey_send_migrate,
0f24558e 3862 .is_alive = pfkey_is_alive,
1da177e4
LT		 3863};
3864
3fa87a32
AD		 3865static int __net_init pfkey_net_init(struct net *net)
3866{
23c049ca 3867 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3fa87a32
AD		 3868 int rv;
3869
3fa87a32
AD		 3870 INIT_HLIST_HEAD(&net_pfkey->table);
3871 atomic_set(&net_pfkey->socks_nr, 0);
23c049ca 3872
7013ec30 3873 rv = pfkey_init_proc(net);
3fa87a32 3874
3fa87a32
AD		 3875 return rv;
3876}
3877
3878static void __net_exit pfkey_net_exit(struct net *net)
3879{
3880 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3881
7013ec30 3882 pfkey_exit_proc(net);
663faeab 3883 WARN_ON(!hlist_empty(&net_pfkey->table));
3fa87a32
AD		 3884}
3885
3886static struct pernet_operations pfkey_net_ops = {
3887 .init = pfkey_net_init,
3888 .exit = pfkey_net_exit,
23c049ca
EB		 3889 .id = &pfkey_net_id,
3890 .size = sizeof(struct netns_pfkey),
3fa87a32
AD		 3891};
3892
1da177e4
LT		 3893static void __exit ipsec_pfkey_exit(void)
3894{
3895 xfrm_unregister_km(&pfkeyv2_mgr);
1da177e4 3896 sock_unregister(PF_KEY);
180211b8 3897 unregister_pernet_subsys(&pfkey_net_ops);
1da177e4
LT		 3898 proto_unregister(&key_proto);
3899}
3900
3901static int __init ipsec_pfkey_init(void)
3902{
3903 int err = proto_register(&key_proto, 0);
3904
3905 if (err != 0)
3906 goto out;
3907
180211b8 3908 err = register_pernet_subsys(&pfkey_net_ops);
1da177e4
LT		 3909 if (err != 0)
3910 goto out_unregister_key_proto;
180211b8
AD		 3911 err = sock_register(&pfkey_family_ops);
3912 if (err != 0)
3913 goto out_unregister_pernet;
f41b284a 3914 xfrm_register_km(&pfkeyv2_mgr);
1da177e4
LT		 3915out:
3916 return err;
180211b8 3917
180211b8
AD		 3918out_unregister_pernet:
3919 unregister_pernet_subsys(&pfkey_net_ops);
1da177e4
LT		 3920out_unregister_key_proto:
3921 proto_unregister(&key_proto);
3922 goto out;
3923}
3924
3925module_init(ipsec_pfkey_init);
3926module_exit(ipsec_pfkey_exit);
3927MODULE_LICENSE("GPL");
3928MODULE_ALIAS_NETPROTO(PF_KEY);
Linux 6.x block layer and io_uring tree(s)