1// SPDX-License-Identifier: GPL-2.0-only
   2/* xfrm_user.c: User interface to configure xfrm engine.
   3 *
   4 * Copyright (C) 2002 David S. Miller (davem@redhat.com)
   5 *
   6 * Changes:
   7 *	Mitsuru KANDA @USAGI
   8 * 	Kazunori MIYAZAWA @USAGI
   9 * 	Kunihiro Ishiguro <kunihiro@ipinfusion.com>
  10 * 		IPv6 support
  11 *
  12 */
  13
  14#include <linux/crypto.h>
  15#include <linux/module.h>
  16#include <linux/kernel.h>
  17#include <linux/types.h>
  18#include <linux/slab.h>
  19#include <linux/socket.h>
  20#include <linux/string.h>
  21#include <linux/net.h>
  22#include <linux/skbuff.h>
  23#include <linux/pfkeyv2.h>
  24#include <linux/ipsec.h>
  25#include <linux/init.h>
  26#include <linux/security.h>
  27#include <net/sock.h>
  28#include <net/xfrm.h>
  29#include <net/netlink.h>
  30#include <net/ah.h>
  31#include <linux/uaccess.h>
  32#if IS_ENABLED(CONFIG_IPV6)
  33#include <linux/in6.h>
  34#endif
  35#include <asm/unaligned.h>
  36
  37static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type)
  38{
  39	struct nlattr *rt = attrs[type];
  40	struct xfrm_algo *algp;
  41
  42	if (!rt)
  43		return 0;
  44
  45	algp = nla_data(rt);
  46	if (nla_len(rt) < (int)xfrm_alg_len(algp))
  47		return -EINVAL;
  48
  49	switch (type) {
  50	case XFRMA_ALG_AUTH:
  51	case XFRMA_ALG_CRYPT:
  52	case XFRMA_ALG_COMP:
  53		break;
  54
  55	default:
  56		return -EINVAL;
  57	}
  58
  59	algp->alg_name[sizeof(algp->alg_name) - 1] = '\0';
  60	return 0;
  61}
  62
  63static int verify_auth_trunc(struct nlattr **attrs)
  64{
  65	struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC];
  66	struct xfrm_algo_auth *algp;
  67
  68	if (!rt)
  69		return 0;
  70
  71	algp = nla_data(rt);
  72	if (nla_len(rt) < (int)xfrm_alg_auth_len(algp))
  73		return -EINVAL;
  74
  75	algp->alg_name[sizeof(algp->alg_name) - 1] = '\0';
  76	return 0;
  77}
  78
  79static int verify_aead(struct nlattr **attrs)
  80{
  81	struct nlattr *rt = attrs[XFRMA_ALG_AEAD];
  82	struct xfrm_algo_aead *algp;
  83
  84	if (!rt)
  85		return 0;
  86
  87	algp = nla_data(rt);
  88	if (nla_len(rt) < (int)aead_len(algp))
  89		return -EINVAL;
  90
  91	algp->alg_name[sizeof(algp->alg_name) - 1] = '\0';
  92	return 0;
  93}
  94
  95static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type,
  96			   xfrm_address_t **addrp)
  97{
  98	struct nlattr *rt = attrs[type];
  99
 100	if (rt && addrp)
 101		*addrp = nla_data(rt);
 102}
 103
 104static inline int verify_sec_ctx_len(struct nlattr **attrs)
 105{
 106	struct nlattr *rt = attrs[XFRMA_SEC_CTX];
 107	struct xfrm_user_sec_ctx *uctx;
 108
 109	if (!rt)
 110		return 0;
 111
 112	uctx = nla_data(rt);
 113	if (uctx->len > nla_len(rt) ||
 114	    uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len))
 115		return -EINVAL;
 116
 117	return 0;
 118}
 119
 120static inline int verify_replay(struct xfrm_usersa_info *p,
 121				struct nlattr **attrs)
 122{
 123	struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL];
 124	struct xfrm_replay_state_esn *rs;
 125
 126	if (!rt)
 127		return (p->flags & XFRM_STATE_ESN) ? -EINVAL : 0;
 128
 129	rs = nla_data(rt);
 130
 131	if (rs->bmp_len > XFRMA_REPLAY_ESN_MAX / sizeof(rs->bmp[0]) / 8)
 132		return -EINVAL;
 133
 134	if (nla_len(rt) < (int)xfrm_replay_state_esn_len(rs) &&
 135	    nla_len(rt) != sizeof(*rs))
 136		return -EINVAL;
 137
 138	/* As only ESP and AH support ESN feature. */
 139	if ((p->id.proto != IPPROTO_ESP) && (p->id.proto != IPPROTO_AH))
 140		return -EINVAL;
 141
 142	if (p->replay_window != 0)
 143		return -EINVAL;
 144
 145	return 0;
 146}
 147
 148static int verify_newsa_info(struct xfrm_usersa_info *p,
 149			     struct nlattr **attrs)
 150{
 151	int err;
 152
 153	err = -EINVAL;
 154	switch (p->family) {
 155	case AF_INET:
 156		break;
 157
 158	case AF_INET6:
 159#if IS_ENABLED(CONFIG_IPV6)
 160		break;
 161#else
 162		err = -EAFNOSUPPORT;
 163		goto out;
 164#endif
 165
 166	default:
 167		goto out;
 168	}
 169
 170	switch (p->sel.family) {
 171	case AF_UNSPEC:
 172		break;
 173
 174	case AF_INET:
 175		if (p->sel.prefixlen_d > 32 || p->sel.prefixlen_s > 32)
 176			goto out;
 177
 178		break;
 179
 180	case AF_INET6:
 181#if IS_ENABLED(CONFIG_IPV6)
 182		if (p->sel.prefixlen_d > 128 || p->sel.prefixlen_s > 128)
 183			goto out;
 184
 185		break;
 186#else
 187		err = -EAFNOSUPPORT;
 188		goto out;
 189#endif
 190
 191	default:
 192		goto out;
 193	}
 194
 195	err = -EINVAL;
 196	switch (p->id.proto) {
 197	case IPPROTO_AH:
 198		if ((!attrs[XFRMA_ALG_AUTH]	&&
 199		     !attrs[XFRMA_ALG_AUTH_TRUNC]) ||
 200		    attrs[XFRMA_ALG_AEAD]	||
 201		    attrs[XFRMA_ALG_CRYPT]	||
 202		    attrs[XFRMA_ALG_COMP]	||
 203		    attrs[XFRMA_TFCPAD])
 204			goto out;
 205		break;
 206
 207	case IPPROTO_ESP:
 208		if (attrs[XFRMA_ALG_COMP])
 209			goto out;
 210		if (!attrs[XFRMA_ALG_AUTH] &&
 211		    !attrs[XFRMA_ALG_AUTH_TRUNC] &&
 212		    !attrs[XFRMA_ALG_CRYPT] &&
 213		    !attrs[XFRMA_ALG_AEAD])
 214			goto out;
 215		if ((attrs[XFRMA_ALG_AUTH] ||
 216		     attrs[XFRMA_ALG_AUTH_TRUNC] ||
 217		     attrs[XFRMA_ALG_CRYPT]) &&
 218		    attrs[XFRMA_ALG_AEAD])
 219			goto out;
 220		if (attrs[XFRMA_TFCPAD] &&
 221		    p->mode != XFRM_MODE_TUNNEL)
 222			goto out;
 223		break;
 224
 225	case IPPROTO_COMP:
 226		if (!attrs[XFRMA_ALG_COMP]	||
 227		    attrs[XFRMA_ALG_AEAD]	||
 228		    attrs[XFRMA_ALG_AUTH]	||
 229		    attrs[XFRMA_ALG_AUTH_TRUNC]	||
 230		    attrs[XFRMA_ALG_CRYPT]	||
 231		    attrs[XFRMA_TFCPAD]		||
 232		    (ntohl(p->id.spi) >= 0x10000))
 233			goto out;
 234		break;
 235
 236#if IS_ENABLED(CONFIG_IPV6)
 237	case IPPROTO_DSTOPTS:
 238	case IPPROTO_ROUTING:
 239		if (attrs[XFRMA_ALG_COMP]	||
 240		    attrs[XFRMA_ALG_AUTH]	||
 241		    attrs[XFRMA_ALG_AUTH_TRUNC]	||
 242		    attrs[XFRMA_ALG_AEAD]	||
 243		    attrs[XFRMA_ALG_CRYPT]	||
 244		    attrs[XFRMA_ENCAP]		||
 245		    attrs[XFRMA_SEC_CTX]	||
 246		    attrs[XFRMA_TFCPAD]		||
 247		    !attrs[XFRMA_COADDR])
 248			goto out;
 249		break;
 250#endif
 251
 252	default:
 253		goto out;
 254	}
 255
 256	if ((err = verify_aead(attrs)))
 257		goto out;
 258	if ((err = verify_auth_trunc(attrs)))
 259		goto out;
 260	if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH)))
 261		goto out;
 262	if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT)))
 263		goto out;
 264	if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP)))
 265		goto out;
 266	if ((err = verify_sec_ctx_len(attrs)))
 267		goto out;
 268	if ((err = verify_replay(p, attrs)))
 269		goto out;
 270
 271	err = -EINVAL;
 272	switch (p->mode) {
 273	case XFRM_MODE_TRANSPORT:
 274	case XFRM_MODE_TUNNEL:
 275	case XFRM_MODE_ROUTEOPTIMIZATION:
 276	case XFRM_MODE_BEET:
 277		break;
 278
 279	default:
 280		goto out;
 281	}
 282
 283	err = 0;
 284
 285out:
 286	return err;
 287}
 288
 289static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
 290			   struct xfrm_algo_desc *(*get_byname)(const char *, int),
 291			   struct nlattr *rta)
 292{
 293	struct xfrm_algo *p, *ualg;
 294	struct xfrm_algo_desc *algo;
 295
 296	if (!rta)
 297		return 0;
 298
 299	ualg = nla_data(rta);
 300
 301	algo = get_byname(ualg->alg_name, 1);
 302	if (!algo)
 303		return -ENOSYS;
 304	*props = algo->desc.sadb_alg_id;
 305
 306	p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
 307	if (!p)
 308		return -ENOMEM;
 309
 310	strcpy(p->alg_name, algo->name);
 311	*algpp = p;
 312	return 0;
 313}
 314
 315static int attach_crypt(struct xfrm_state *x, struct nlattr *rta)
 316{
 317	struct xfrm_algo *p, *ualg;
 318	struct xfrm_algo_desc *algo;
 319
 320	if (!rta)
 321		return 0;
 322
 323	ualg = nla_data(rta);
 324
 325	algo = xfrm_ealg_get_byname(ualg->alg_name, 1);
 326	if (!algo)
 327		return -ENOSYS;
 328	x->props.ealgo = algo->desc.sadb_alg_id;
 329
 330	p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
 331	if (!p)
 332		return -ENOMEM;
 333
 334	strcpy(p->alg_name, algo->name);
 335	x->ealg = p;
 336	x->geniv = algo->uinfo.encr.geniv;
 337	return 0;
 338}
 339
 340static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,
 341		       struct nlattr *rta)
 342{
 343	struct xfrm_algo *ualg;
 344	struct xfrm_algo_auth *p;
 345	struct xfrm_algo_desc *algo;
 346
 347	if (!rta)
 348		return 0;
 349
 350	ualg = nla_data(rta);
 351
 352	algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
 353	if (!algo)
 354		return -ENOSYS;
 355	*props = algo->desc.sadb_alg_id;
 356
 357	p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL);
 358	if (!p)
 359		return -ENOMEM;
 360
 361	strcpy(p->alg_name, algo->name);
 362	p->alg_key_len = ualg->alg_key_len;
 363	p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
 364	memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8);
 365
 366	*algpp = p;
 367	return 0;
 368}
 369
 370static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,
 371			     struct nlattr *rta)
 372{
 373	struct xfrm_algo_auth *p, *ualg;
 374	struct xfrm_algo_desc *algo;
 375
 376	if (!rta)
 377		return 0;
 378
 379	ualg = nla_data(rta);
 380
 381	algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
 382	if (!algo)
 383		return -ENOSYS;
 384	if (ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits)
 385		return -EINVAL;
 386	*props = algo->desc.sadb_alg_id;
 387
 388	p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);
 389	if (!p)
 390		return -ENOMEM;
 391
 392	strcpy(p->alg_name, algo->name);
 393	if (!p->alg_trunc_len)
 394		p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
 395
 396	*algpp = p;
 397	return 0;
 398}
 399
 400static int attach_aead(struct xfrm_state *x, struct nlattr *rta)
 401{
 402	struct xfrm_algo_aead *p, *ualg;
 403	struct xfrm_algo_desc *algo;
 404
 405	if (!rta)
 406		return 0;
 407
 408	ualg = nla_data(rta);
 409
 410	algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
 411	if (!algo)
 412		return -ENOSYS;
 413	x->props.ealgo = algo->desc.sadb_alg_id;
 414
 415	p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
 416	if (!p)
 417		return -ENOMEM;
 418
 419	strcpy(p->alg_name, algo->name);
 420	x->aead = p;
 421	x->geniv = algo->uinfo.aead.geniv;
 422	return 0;
 423}
 424
 425static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn,
 426					 struct nlattr *rp)
 427{
 428	struct xfrm_replay_state_esn *up;
 429	unsigned int ulen;
 430
 431	if (!replay_esn || !rp)
 432		return 0;
 433
 434	up = nla_data(rp);
 435	ulen = xfrm_replay_state_esn_len(up);
 436
 437	/* Check the overall length and the internal bitmap length to avoid
 438	 * potential overflow. */
 439	if (nla_len(rp) < (int)ulen ||
 440	    xfrm_replay_state_esn_len(replay_esn) != ulen ||
 441	    replay_esn->bmp_len != up->bmp_len)
 442		return -EINVAL;
 443
 444	if (up->replay_window > up->bmp_len * sizeof(__u32) * 8)
 445		return -EINVAL;
 446
 447	return 0;
 448}
 449
 450static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,
 451				       struct xfrm_replay_state_esn **preplay_esn,
 452				       struct nlattr *rta)
 453{
 454	struct xfrm_replay_state_esn *p, *pp, *up;
 455	unsigned int klen, ulen;
 456
 457	if (!rta)
 458		return 0;
 459
 460	up = nla_data(rta);
 461	klen = xfrm_replay_state_esn_len(up);
 462	ulen = nla_len(rta) >= (int)klen ? klen : sizeof(*up);
 463
 464	p = kzalloc(klen, GFP_KERNEL);
 465	if (!p)
 466		return -ENOMEM;
 467
 468	pp = kzalloc(klen, GFP_KERNEL);
 469	if (!pp) {
 470		kfree(p);
 471		return -ENOMEM;
 472	}
 473
 474	memcpy(p, up, ulen);
 475	memcpy(pp, up, ulen);
 476
 477	*replay_esn = p;
 478	*preplay_esn = pp;
 479
 480	return 0;
 481}
 482
 483static inline unsigned int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
 484{
 485	unsigned int len = 0;
 486
 487	if (xfrm_ctx) {
 488		len += sizeof(struct xfrm_user_sec_ctx);
 489		len += xfrm_ctx->ctx_len;
 490	}
 491	return len;
 492}
 493
 494static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
 495{
 496	memcpy(&x->id, &p->id, sizeof(x->id));
 497	memcpy(&x->sel, &p->sel, sizeof(x->sel));
 498	memcpy(&x->lft, &p->lft, sizeof(x->lft));
 499	x->props.mode = p->mode;
 500	x->props.replay_window = min_t(unsigned int, p->replay_window,
 501					sizeof(x->replay.bitmap) * 8);
 502	x->props.reqid = p->reqid;
 503	x->props.family = p->family;
 504	memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
 505	x->props.flags = p->flags;
 506
 507	if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
 508		x->sel.family = p->family;
 509}
 510
 511/*
 512 * someday when pfkey also has support, we could have the code
 513 * somehow made shareable and move it to xfrm_state.c - JHS
 514 *
 515*/
 516static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs,
 517				  int update_esn)
 518{
 519	struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
 520	struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL;
 521	struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
 522	struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
 523	struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
 524
 525	if (re) {
 526		struct xfrm_replay_state_esn *replay_esn;
 527		replay_esn = nla_data(re);
 528		memcpy(x->replay_esn, replay_esn,
 529		       xfrm_replay_state_esn_len(replay_esn));
 530		memcpy(x->preplay_esn, replay_esn,
 531		       xfrm_replay_state_esn_len(replay_esn));
 532	}
 533
 534	if (rp) {
 535		struct xfrm_replay_state *replay;
 536		replay = nla_data(rp);
 537		memcpy(&x->replay, replay, sizeof(*replay));
 538		memcpy(&x->preplay, replay, sizeof(*replay));
 539	}
 540
 541	if (lt) {
 542		struct xfrm_lifetime_cur *ltime;
 543		ltime = nla_data(lt);
 544		x->curlft.bytes = ltime->bytes;
 545		x->curlft.packets = ltime->packets;
 546		x->curlft.add_time = ltime->add_time;
 547		x->curlft.use_time = ltime->use_time;
 548	}
 549
 550	if (et)
 551		x->replay_maxage = nla_get_u32(et);
 552
 553	if (rt)
 554		x->replay_maxdiff = nla_get_u32(rt);
 555}
 556
 557static void xfrm_smark_init(struct nlattr **attrs, struct xfrm_mark *m)
 558{
 559	if (attrs[XFRMA_SET_MARK]) {
 560		m->v = nla_get_u32(attrs[XFRMA_SET_MARK]);
 561		if (attrs[XFRMA_SET_MARK_MASK])
 562			m->m = nla_get_u32(attrs[XFRMA_SET_MARK_MASK]);
 563		else
 564			m->m = 0xffffffff;
 565	} else {
 566		m->v = m->m = 0;
 567	}
 568}
 569
 570static struct xfrm_state *xfrm_state_construct(struct net *net,
 571					       struct xfrm_usersa_info *p,
 572					       struct nlattr **attrs,
 573					       int *errp)
 574{
 575	struct xfrm_state *x = xfrm_state_alloc(net);
 576	int err = -ENOMEM;
 577
 578	if (!x)
 579		goto error_no_put;
 580
 581	copy_from_user_state(x, p);
 582
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 583	if (attrs[XFRMA_SA_EXTRA_FLAGS])
 584		x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]);
 585
 586	if ((err = attach_aead(x, attrs[XFRMA_ALG_AEAD])))
 587		goto error;
 588	if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
 589				     attrs[XFRMA_ALG_AUTH_TRUNC])))
 590		goto error;
 591	if (!x->props.aalgo) {
 592		if ((err = attach_auth(&x->aalg, &x->props.aalgo,
 593				       attrs[XFRMA_ALG_AUTH])))
 594			goto error;
 595	}
 596	if ((err = attach_crypt(x, attrs[XFRMA_ALG_CRYPT])))
 597		goto error;
 598	if ((err = attach_one_algo(&x->calg, &x->props.calgo,
 599				   xfrm_calg_get_byname,
 600				   attrs[XFRMA_ALG_COMP])))
 601		goto error;
 602
 603	if (attrs[XFRMA_ENCAP]) {
 604		x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
 605				   sizeof(*x->encap), GFP_KERNEL);
 606		if (x->encap == NULL)
 607			goto error;
 608	}
 609
 610	if (attrs[XFRMA_TFCPAD])
 611		x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);
 612
 613	if (attrs[XFRMA_COADDR]) {
 614		x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
 615				    sizeof(*x->coaddr), GFP_KERNEL);
 616		if (x->coaddr == NULL)
 617			goto error;
 618	}
 619
 620	xfrm_mark_get(attrs, &x->mark);
 621
 622	xfrm_smark_init(attrs, &x->props.smark);
 623
 624	if (attrs[XFRMA_IF_ID])
 625		x->if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
 626
 627	err = __xfrm_init_state(x, false, attrs[XFRMA_OFFLOAD_DEV]);
 628	if (err)
 629		goto error;
 630
 631	if (attrs[XFRMA_SEC_CTX]) {
 632		err = security_xfrm_state_alloc(x,
 633						nla_data(attrs[XFRMA_SEC_CTX]));
 634		if (err)
 635			goto error;
 636	}
 637
 638	if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn,
 639					       attrs[XFRMA_REPLAY_ESN_VAL])))
 640		goto error;
 641
 642	x->km.seq = p->seq;
 643	x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
 644	/* sysctl_xfrm_aevent_etime is in 100ms units */
 645	x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
 646
 647	if ((err = xfrm_init_replay(x)))
 648		goto error;
 649
 650	/* override default values from above */
 651	xfrm_update_ae_params(x, attrs, 0);
 652
 653	/* configure the hardware if offload is requested */
 654	if (attrs[XFRMA_OFFLOAD_DEV]) {
 655		err = xfrm_dev_state_add(net, x,
 656					 nla_data(attrs[XFRMA_OFFLOAD_DEV]));
 657		if (err)
 658			goto error;
 659	}
 660
 661	return x;
 662
 663error:
 664	x->km.state = XFRM_STATE_DEAD;
 665	xfrm_state_put(x);
 666error_no_put:
 667	*errp = err;
 668	return NULL;
 669}
 670
 671static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
 672		struct nlattr **attrs)
 673{
 674	struct net *net = sock_net(skb->sk);
 675	struct xfrm_usersa_info *p = nlmsg_data(nlh);
 676	struct xfrm_state *x;
 677	int err;
 678	struct km_event c;
 679
 680	err = verify_newsa_info(p, attrs);
 681	if (err)
 682		return err;
 683
 684	x = xfrm_state_construct(net, p, attrs, &err);
 685	if (!x)
 686		return err;
 687
 688	xfrm_state_hold(x);
 689	if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
 690		err = xfrm_state_add(x);
 691	else
 692		err = xfrm_state_update(x);
 693
 694	xfrm_audit_state_add(x, err ? 0 : 1, true);
 695
 696	if (err < 0) {
 697		x->km.state = XFRM_STATE_DEAD;
 698		xfrm_dev_state_delete(x);
 699		__xfrm_state_put(x);
 700		goto out;
 701	}
 702
 703	if (x->km.state == XFRM_STATE_VOID)
 704		x->km.state = XFRM_STATE_VALID;
 705
 706	c.seq = nlh->nlmsg_seq;
 707	c.portid = nlh->nlmsg_pid;
 708	c.event = nlh->nlmsg_type;
 709
 710	km_state_notify(x, &c);
 711out:
 712	xfrm_state_put(x);
 713	return err;
 714}
 715
 716static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
 717						 struct xfrm_usersa_id *p,
 718						 struct nlattr **attrs,
 719						 int *errp)
 720{
 721	struct xfrm_state *x = NULL;
 722	struct xfrm_mark m;
 723	int err;
 724	u32 mark = xfrm_mark_get(attrs, &m);
 725
 726	if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
 727		err = -ESRCH;
 728		x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);
 729	} else {
 730		xfrm_address_t *saddr = NULL;
 731
 732		verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
 733		if (!saddr) {
 734			err = -EINVAL;
 735			goto out;
 736		}
 737
 738		err = -ESRCH;
 739		x = xfrm_state_lookup_byaddr(net, mark,
 740					     &p->daddr, saddr,
 741					     p->proto, p->family);
 742	}
 743
 744 out:
 745	if (!x && errp)
 746		*errp = err;
 747	return x;
 748}
 749
 750static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
 751		struct nlattr **attrs)
 752{
 753	struct net *net = sock_net(skb->sk);
 754	struct xfrm_state *x;
 755	int err = -ESRCH;
 756	struct km_event c;
 757	struct xfrm_usersa_id *p = nlmsg_data(nlh);
 758
 759	x = xfrm_user_state_lookup(net, p, attrs, &err);
 760	if (x == NULL)
 761		return err;
 762
 763	if ((err = security_xfrm_state_delete(x)) != 0)
 764		goto out;
 765
 766	if (xfrm_state_kern(x)) {
 767		err = -EPERM;
 768		goto out;
 769	}
 770
 771	err = xfrm_state_delete(x);
 772
 773	if (err < 0)
 774		goto out;
 775
 776	c.seq = nlh->nlmsg_seq;
 777	c.portid = nlh->nlmsg_pid;
 778	c.event = nlh->nlmsg_type;
 779	km_state_notify(x, &c);
 780
 781out:
 782	xfrm_audit_state_delete(x, err ? 0 : 1, true);
 783	xfrm_state_put(x);
 784	return err;
 785}
 786
 787static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
 788{
 789	memset(p, 0, sizeof(*p));
 790	memcpy(&p->id, &x->id, sizeof(p->id));
 791	memcpy(&p->sel, &x->sel, sizeof(p->sel));
 792	memcpy(&p->lft, &x->lft, sizeof(p->lft));
 793	memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
 794	put_unaligned(x->stats.replay_window, &p->stats.replay_window);
 795	put_unaligned(x->stats.replay, &p->stats.replay);
 796	put_unaligned(x->stats.integrity_failed, &p->stats.integrity_failed);
 797	memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
 798	p->mode = x->props.mode;
 799	p->replay_window = x->props.replay_window;
 800	p->reqid = x->props.reqid;
 801	p->family = x->props.family;
 802	p->flags = x->props.flags;
 803	p->seq = x->km.seq;
 804}
 805
 806struct xfrm_dump_info {
 807	struct sk_buff *in_skb;
 808	struct sk_buff *out_skb;
 809	u32 nlmsg_seq;
 810	u16 nlmsg_flags;
 811};
 812
 813static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
 814{
 815	struct xfrm_user_sec_ctx *uctx;
 816	struct nlattr *attr;
 817	int ctx_size = sizeof(*uctx) + s->ctx_len;
 818
 819	attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
 820	if (attr == NULL)
 821		return -EMSGSIZE;
 822
 823	uctx = nla_data(attr);
 824	uctx->exttype = XFRMA_SEC_CTX;
 825	uctx->len = ctx_size;
 826	uctx->ctx_doi = s->ctx_doi;
 827	uctx->ctx_alg = s->ctx_alg;
 828	uctx->ctx_len = s->ctx_len;
 829	memcpy(uctx + 1, s->ctx_str, s->ctx_len);
 830
 831	return 0;
 832}
 833
 834static int copy_user_offload(struct xfrm_state_offload *xso, struct sk_buff *skb)
 835{
 836	struct xfrm_user_offload *xuo;
 837	struct nlattr *attr;
 838
 839	attr = nla_reserve(skb, XFRMA_OFFLOAD_DEV, sizeof(*xuo));
 840	if (attr == NULL)
 841		return -EMSGSIZE;
 842
 843	xuo = nla_data(attr);
 844	memset(xuo, 0, sizeof(*xuo));
 845	xuo->ifindex = xso->dev->ifindex;
 846	xuo->flags = xso->flags;
 847
 848	return 0;
 849}
 850
 
 
 
 
 
 
 851static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
 852{
 853	struct xfrm_algo *algo;
 
 854	struct nlattr *nla;
 
 855
 856	nla = nla_reserve(skb, XFRMA_ALG_AUTH,
 857			  sizeof(*algo) + (auth->alg_key_len + 7) / 8);
 858	if (!nla)
 859		return -EMSGSIZE;
 860
 861	algo = nla_data(nla);
 862	strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name));
 863	memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8);
 
 
 
 
 
 864	algo->alg_key_len = auth->alg_key_len;
 865
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 866	return 0;
 867}
 868
 869static int xfrm_smark_put(struct sk_buff *skb, struct xfrm_mark *m)
 870{
 871	int ret = 0;
 872
 873	if (m->v | m->m) {
 874		ret = nla_put_u32(skb, XFRMA_SET_MARK, m->v);
 875		if (!ret)
 876			ret = nla_put_u32(skb, XFRMA_SET_MARK_MASK, m->m);
 877	}
 878	return ret;
 879}
 880
 881/* Don't change this without updating xfrm_sa_len! */
 882static int copy_to_user_state_extra(struct xfrm_state *x,
 883				    struct xfrm_usersa_info *p,
 884				    struct sk_buff *skb)
 885{
 886	int ret = 0;
 887
 888	copy_to_user_state(x, p);
 889
 890	if (x->props.extra_flags) {
 891		ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS,
 892				  x->props.extra_flags);
 893		if (ret)
 894			goto out;
 895	}
 896
 897	if (x->coaddr) {
 898		ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
 899		if (ret)
 900			goto out;
 901	}
 902	if (x->lastused) {
 903		ret = nla_put_u64_64bit(skb, XFRMA_LASTUSED, x->lastused,
 904					XFRMA_PAD);
 905		if (ret)
 906			goto out;
 907	}
 908	if (x->aead) {
 909		ret = nla_put(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead);
 910		if (ret)
 911			goto out;
 912	}
 913	if (x->aalg) {
 914		ret = copy_to_user_auth(x->aalg, skb);
 915		if (!ret)
 916			ret = nla_put(skb, XFRMA_ALG_AUTH_TRUNC,
 917				      xfrm_alg_auth_len(x->aalg), x->aalg);
 918		if (ret)
 919			goto out;
 920	}
 921	if (x->ealg) {
 922		ret = nla_put(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg);
 923		if (ret)
 924			goto out;
 925	}
 926	if (x->calg) {
 927		ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
 928		if (ret)
 929			goto out;
 930	}
 931	if (x->encap) {
 932		ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
 933		if (ret)
 934			goto out;
 935	}
 936	if (x->tfcpad) {
 937		ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad);
 938		if (ret)
 939			goto out;
 940	}
 941	ret = xfrm_mark_put(skb, &x->mark);
 942	if (ret)
 943		goto out;
 944
 945	ret = xfrm_smark_put(skb, &x->props.smark);
 946	if (ret)
 947		goto out;
 948
 949	if (x->replay_esn)
 950		ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
 951			      xfrm_replay_state_esn_len(x->replay_esn),
 952			      x->replay_esn);
 953	else
 954		ret = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
 955			      &x->replay);
 956	if (ret)
 957		goto out;
 958	if(x->xso.dev)
 959		ret = copy_user_offload(&x->xso, skb);
 960	if (ret)
 961		goto out;
 962	if (x->if_id) {
 963		ret = nla_put_u32(skb, XFRMA_IF_ID, x->if_id);
 964		if (ret)
 965			goto out;
 966	}
 967	if (x->security)
 968		ret = copy_sec_ctx(x->security, skb);
 969out:
 970	return ret;
 971}
 972
 973static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
 974{
 975	struct xfrm_dump_info *sp = ptr;
 976	struct sk_buff *in_skb = sp->in_skb;
 977	struct sk_buff *skb = sp->out_skb;
 
 978	struct xfrm_usersa_info *p;
 979	struct nlmsghdr *nlh;
 980	int err;
 981
 982	nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
 983			XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
 984	if (nlh == NULL)
 985		return -EMSGSIZE;
 986
 987	p = nlmsg_data(nlh);
 988
 989	err = copy_to_user_state_extra(x, p, skb);
 990	if (err) {
 991		nlmsg_cancel(skb, nlh);
 992		return err;
 993	}
 994	nlmsg_end(skb, nlh);
 
 
 
 
 
 
 
 
 
 
 
 
 995	return 0;
 996}
 997
 998static int xfrm_dump_sa_done(struct netlink_callback *cb)
 999{
1000	struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
1001	struct sock *sk = cb->skb->sk;
1002	struct net *net = sock_net(sk);
1003
1004	if (cb->args[0])
1005		xfrm_state_walk_done(walk, net);
1006	return 0;
1007}
1008
1009static const struct nla_policy xfrma_policy[XFRMA_MAX+1];
1010static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
1011{
1012	struct net *net = sock_net(skb->sk);
1013	struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
1014	struct xfrm_dump_info info;
1015
1016	BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
1017		     sizeof(cb->args) - sizeof(cb->args[0]));
1018
1019	info.in_skb = cb->skb;
1020	info.out_skb = skb;
1021	info.nlmsg_seq = cb->nlh->nlmsg_seq;
1022	info.nlmsg_flags = NLM_F_MULTI;
1023
1024	if (!cb->args[0]) {
1025		struct nlattr *attrs[XFRMA_MAX+1];
1026		struct xfrm_address_filter *filter = NULL;
1027		u8 proto = 0;
1028		int err;
1029
1030		err = nlmsg_parse_deprecated(cb->nlh, 0, attrs, XFRMA_MAX,
1031					     xfrma_policy, cb->extack);
1032		if (err < 0)
1033			return err;
1034
1035		if (attrs[XFRMA_ADDRESS_FILTER]) {
1036			filter = kmemdup(nla_data(attrs[XFRMA_ADDRESS_FILTER]),
1037					 sizeof(*filter), GFP_KERNEL);
1038			if (filter == NULL)
1039				return -ENOMEM;
1040		}
1041
1042		if (attrs[XFRMA_PROTO])
1043			proto = nla_get_u8(attrs[XFRMA_PROTO]);
1044
1045		xfrm_state_walk_init(walk, proto, filter);
1046		cb->args[0] = 1;
1047	}
1048
1049	(void) xfrm_state_walk(net, walk, dump_one_state, &info);
1050
1051	return skb->len;
1052}
1053
1054static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
1055					  struct xfrm_state *x, u32 seq)
1056{
1057	struct xfrm_dump_info info;
1058	struct sk_buff *skb;
1059	int err;
1060
1061	skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1062	if (!skb)
1063		return ERR_PTR(-ENOMEM);
1064
1065	info.in_skb = in_skb;
1066	info.out_skb = skb;
1067	info.nlmsg_seq = seq;
1068	info.nlmsg_flags = 0;
1069
1070	err = dump_one_state(x, 0, &info);
1071	if (err) {
1072		kfree_skb(skb);
1073		return ERR_PTR(err);
1074	}
1075
1076	return skb;
1077}
1078
1079/* A wrapper for nlmsg_multicast() checking that nlsk is still available.
1080 * Must be called with RCU read lock.
1081 */
1082static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb,
1083				       u32 pid, unsigned int group)
1084{
1085	struct sock *nlsk = rcu_dereference(net->xfrm.nlsk);
 
1086
1087	if (!nlsk) {
1088		kfree_skb(skb);
1089		return -EPIPE;
1090	}
1091
 
 
 
 
 
 
 
 
 
 
 
1092	return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC);
1093}
1094
1095static inline unsigned int xfrm_spdinfo_msgsize(void)
1096{
1097	return NLMSG_ALIGN(4)
1098	       + nla_total_size(sizeof(struct xfrmu_spdinfo))
1099	       + nla_total_size(sizeof(struct xfrmu_spdhinfo))
1100	       + nla_total_size(sizeof(struct xfrmu_spdhthresh))
1101	       + nla_total_size(sizeof(struct xfrmu_spdhthresh));
1102}
1103
1104static int build_spdinfo(struct sk_buff *skb, struct net *net,
1105			 u32 portid, u32 seq, u32 flags)
1106{
1107	struct xfrmk_spdinfo si;
1108	struct xfrmu_spdinfo spc;
1109	struct xfrmu_spdhinfo sph;
1110	struct xfrmu_spdhthresh spt4, spt6;
1111	struct nlmsghdr *nlh;
1112	int err;
1113	u32 *f;
1114	unsigned lseq;
1115
1116	nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
1117	if (nlh == NULL) /* shouldn't really happen ... */
1118		return -EMSGSIZE;
1119
1120	f = nlmsg_data(nlh);
1121	*f = flags;
1122	xfrm_spd_getinfo(net, &si);
1123	spc.incnt = si.incnt;
1124	spc.outcnt = si.outcnt;
1125	spc.fwdcnt = si.fwdcnt;
1126	spc.inscnt = si.inscnt;
1127	spc.outscnt = si.outscnt;
1128	spc.fwdscnt = si.fwdscnt;
1129	sph.spdhcnt = si.spdhcnt;
1130	sph.spdhmcnt = si.spdhmcnt;
1131
1132	do {
1133		lseq = read_seqbegin(&net->xfrm.policy_hthresh.lock);
1134
1135		spt4.lbits = net->xfrm.policy_hthresh.lbits4;
1136		spt4.rbits = net->xfrm.policy_hthresh.rbits4;
1137		spt6.lbits = net->xfrm.policy_hthresh.lbits6;
1138		spt6.rbits = net->xfrm.policy_hthresh.rbits6;
1139	} while (read_seqretry(&net->xfrm.policy_hthresh.lock, lseq));
1140
1141	err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
1142	if (!err)
1143		err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
1144	if (!err)
1145		err = nla_put(skb, XFRMA_SPD_IPV4_HTHRESH, sizeof(spt4), &spt4);
1146	if (!err)
1147		err = nla_put(skb, XFRMA_SPD_IPV6_HTHRESH, sizeof(spt6), &spt6);
1148	if (err) {
1149		nlmsg_cancel(skb, nlh);
1150		return err;
1151	}
1152
1153	nlmsg_end(skb, nlh);
1154	return 0;
1155}
1156
1157static int xfrm_set_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1158			    struct nlattr **attrs)
1159{
1160	struct net *net = sock_net(skb->sk);
1161	struct xfrmu_spdhthresh *thresh4 = NULL;
1162	struct xfrmu_spdhthresh *thresh6 = NULL;
1163
1164	/* selector prefixlen thresholds to hash policies */
1165	if (attrs[XFRMA_SPD_IPV4_HTHRESH]) {
1166		struct nlattr *rta = attrs[XFRMA_SPD_IPV4_HTHRESH];
1167
1168		if (nla_len(rta) < sizeof(*thresh4))
1169			return -EINVAL;
1170		thresh4 = nla_data(rta);
1171		if (thresh4->lbits > 32 || thresh4->rbits > 32)
1172			return -EINVAL;
1173	}
1174	if (attrs[XFRMA_SPD_IPV6_HTHRESH]) {
1175		struct nlattr *rta = attrs[XFRMA_SPD_IPV6_HTHRESH];
1176
1177		if (nla_len(rta) < sizeof(*thresh6))
1178			return -EINVAL;
1179		thresh6 = nla_data(rta);
1180		if (thresh6->lbits > 128 || thresh6->rbits > 128)
1181			return -EINVAL;
1182	}
1183
1184	if (thresh4 || thresh6) {
1185		write_seqlock(&net->xfrm.policy_hthresh.lock);
1186		if (thresh4) {
1187			net->xfrm.policy_hthresh.lbits4 = thresh4->lbits;
1188			net->xfrm.policy_hthresh.rbits4 = thresh4->rbits;
1189		}
1190		if (thresh6) {
1191			net->xfrm.policy_hthresh.lbits6 = thresh6->lbits;
1192			net->xfrm.policy_hthresh.rbits6 = thresh6->rbits;
1193		}
1194		write_sequnlock(&net->xfrm.policy_hthresh.lock);
1195
1196		xfrm_policy_hash_rebuild(net);
1197	}
1198
1199	return 0;
1200}
1201
1202static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1203		struct nlattr **attrs)
1204{
1205	struct net *net = sock_net(skb->sk);
1206	struct sk_buff *r_skb;
1207	u32 *flags = nlmsg_data(nlh);
1208	u32 sportid = NETLINK_CB(skb).portid;
1209	u32 seq = nlh->nlmsg_seq;
1210	int err;
1211
1212	r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
1213	if (r_skb == NULL)
1214		return -ENOMEM;
1215
1216	err = build_spdinfo(r_skb, net, sportid, seq, *flags);
1217	BUG_ON(err < 0);
1218
1219	return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1220}
1221
1222static inline unsigned int xfrm_sadinfo_msgsize(void)
1223{
1224	return NLMSG_ALIGN(4)
1225	       + nla_total_size(sizeof(struct xfrmu_sadhinfo))
1226	       + nla_total_size(4); /* XFRMA_SAD_CNT */
1227}
1228
1229static int build_sadinfo(struct sk_buff *skb, struct net *net,
1230			 u32 portid, u32 seq, u32 flags)
1231{
1232	struct xfrmk_sadinfo si;
1233	struct xfrmu_sadhinfo sh;
1234	struct nlmsghdr *nlh;
1235	int err;
1236	u32 *f;
1237
1238	nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
1239	if (nlh == NULL) /* shouldn't really happen ... */
1240		return -EMSGSIZE;
1241
1242	f = nlmsg_data(nlh);
1243	*f = flags;
1244	xfrm_sad_getinfo(net, &si);
1245
1246	sh.sadhmcnt = si.sadhmcnt;
1247	sh.sadhcnt = si.sadhcnt;
1248
1249	err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt);
1250	if (!err)
1251		err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
1252	if (err) {
1253		nlmsg_cancel(skb, nlh);
1254		return err;
1255	}
1256
1257	nlmsg_end(skb, nlh);
1258	return 0;
1259}
1260
1261static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1262		struct nlattr **attrs)
1263{
1264	struct net *net = sock_net(skb->sk);
1265	struct sk_buff *r_skb;
1266	u32 *flags = nlmsg_data(nlh);
1267	u32 sportid = NETLINK_CB(skb).portid;
1268	u32 seq = nlh->nlmsg_seq;
1269	int err;
1270
1271	r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
1272	if (r_skb == NULL)
1273		return -ENOMEM;
1274
1275	err = build_sadinfo(r_skb, net, sportid, seq, *flags);
1276	BUG_ON(err < 0);
1277
1278	return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1279}
1280
1281static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1282		struct nlattr **attrs)
1283{
1284	struct net *net = sock_net(skb->sk);
1285	struct xfrm_usersa_id *p = nlmsg_data(nlh);
1286	struct xfrm_state *x;
1287	struct sk_buff *resp_skb;
1288	int err = -ESRCH;
1289
1290	x = xfrm_user_state_lookup(net, p, attrs, &err);
1291	if (x == NULL)
1292		goto out_noput;
1293
1294	resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1295	if (IS_ERR(resp_skb)) {
1296		err = PTR_ERR(resp_skb);
1297	} else {
1298		err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1299	}
1300	xfrm_state_put(x);
1301out_noput:
1302	return err;
1303}
1304
1305static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
1306		struct nlattr **attrs)
1307{
1308	struct net *net = sock_net(skb->sk);
1309	struct xfrm_state *x;
1310	struct xfrm_userspi_info *p;
 
1311	struct sk_buff *resp_skb;
1312	xfrm_address_t *daddr;
1313	int family;
1314	int err;
1315	u32 mark;
1316	struct xfrm_mark m;
1317	u32 if_id = 0;
1318
1319	p = nlmsg_data(nlh);
1320	err = verify_spi_info(p->info.id.proto, p->min, p->max);
1321	if (err)
1322		goto out_noput;
1323
1324	family = p->info.family;
1325	daddr = &p->info.id.daddr;
1326
1327	x = NULL;
1328
1329	mark = xfrm_mark_get(attrs, &m);
1330
1331	if (attrs[XFRMA_IF_ID])
1332		if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
1333
1334	if (p->info.seq) {
1335		x = xfrm_find_acq_byseq(net, mark, p->info.seq);
1336		if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) {
1337			xfrm_state_put(x);
1338			x = NULL;
1339		}
1340	}
1341
1342	if (!x)
1343		x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1344				  if_id, p->info.id.proto, daddr,
1345				  &p->info.saddr, 1,
1346				  family);
1347	err = -ENOENT;
1348	if (x == NULL)
1349		goto out_noput;
1350
1351	err = xfrm_alloc_spi(x, p->min, p->max);
1352	if (err)
1353		goto out;
1354
1355	resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1356	if (IS_ERR(resp_skb)) {
1357		err = PTR_ERR(resp_skb);
1358		goto out;
1359	}
1360
 
 
 
 
 
 
 
 
 
 
 
1361	err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1362
1363out:
1364	xfrm_state_put(x);
1365out_noput:
1366	return err;
1367}
1368
1369static int verify_policy_dir(u8 dir)
1370{
1371	switch (dir) {
1372	case XFRM_POLICY_IN:
1373	case XFRM_POLICY_OUT:
1374	case XFRM_POLICY_FWD:
1375		break;
1376
1377	default:
1378		return -EINVAL;
1379	}
1380
1381	return 0;
1382}
1383
1384static int verify_policy_type(u8 type)
1385{
1386	switch (type) {
1387	case XFRM_POLICY_TYPE_MAIN:
1388#ifdef CONFIG_XFRM_SUB_POLICY
1389	case XFRM_POLICY_TYPE_SUB:
1390#endif
1391		break;
1392
1393	default:
1394		return -EINVAL;
1395	}
1396
1397	return 0;
1398}
1399
1400static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
1401{
1402	int ret;
1403
1404	switch (p->share) {
1405	case XFRM_SHARE_ANY:
1406	case XFRM_SHARE_SESSION:
1407	case XFRM_SHARE_USER:
1408	case XFRM_SHARE_UNIQUE:
1409		break;
1410
1411	default:
1412		return -EINVAL;
1413	}
1414
1415	switch (p->action) {
1416	case XFRM_POLICY_ALLOW:
1417	case XFRM_POLICY_BLOCK:
1418		break;
1419
1420	default:
1421		return -EINVAL;
1422	}
1423
1424	switch (p->sel.family) {
1425	case AF_INET:
1426		if (p->sel.prefixlen_d > 32 || p->sel.prefixlen_s > 32)
1427			return -EINVAL;
1428
1429		break;
1430
1431	case AF_INET6:
1432#if IS_ENABLED(CONFIG_IPV6)
1433		if (p->sel.prefixlen_d > 128 || p->sel.prefixlen_s > 128)
1434			return -EINVAL;
1435
1436		break;
1437#else
1438		return  -EAFNOSUPPORT;
1439#endif
1440
1441	default:
1442		return -EINVAL;
1443	}
1444
1445	ret = verify_policy_dir(p->dir);
1446	if (ret)
1447		return ret;
1448	if (p->index && (xfrm_policy_id2dir(p->index) != p->dir))
1449		return -EINVAL;
1450
1451	return 0;
1452}
1453
1454static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
1455{
1456	struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1457	struct xfrm_user_sec_ctx *uctx;
1458
1459	if (!rt)
1460		return 0;
1461
1462	uctx = nla_data(rt);
1463	return security_xfrm_policy_alloc(&pol->security, uctx, GFP_KERNEL);
1464}
1465
1466static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1467			   int nr)
1468{
1469	int i;
1470
1471	xp->xfrm_nr = nr;
1472	for (i = 0; i < nr; i++, ut++) {
1473		struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1474
1475		memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1476		memcpy(&t->saddr, &ut->saddr,
1477		       sizeof(xfrm_address_t));
1478		t->reqid = ut->reqid;
1479		t->mode = ut->mode;
1480		t->share = ut->share;
1481		t->optional = ut->optional;
1482		t->aalgos = ut->aalgos;
1483		t->ealgos = ut->ealgos;
1484		t->calgos = ut->calgos;
1485		/* If all masks are ~0, then we allow all algorithms. */
1486		t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
1487		t->encap_family = ut->family;
1488	}
1489}
1490
1491static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
1492{
1493	u16 prev_family;
1494	int i;
1495
1496	if (nr > XFRM_MAX_DEPTH)
1497		return -EINVAL;
1498
1499	prev_family = family;
1500
1501	for (i = 0; i < nr; i++) {
1502		/* We never validated the ut->family value, so many
1503		 * applications simply leave it at zero.  The check was
1504		 * never made and ut->family was ignored because all
1505		 * templates could be assumed to have the same family as
1506		 * the policy itself.  Now that we will have ipv4-in-ipv6
1507		 * and ipv6-in-ipv4 tunnels, this is no longer true.
1508		 */
1509		if (!ut[i].family)
1510			ut[i].family = family;
1511
1512		switch (ut[i].mode) {
1513		case XFRM_MODE_TUNNEL:
1514		case XFRM_MODE_BEET:
1515			break;
1516		default:
1517			if (ut[i].family != prev_family)
1518				return -EINVAL;
1519			break;
1520		}
1521		if (ut[i].mode >= XFRM_MODE_MAX)
1522			return -EINVAL;
1523
1524		prev_family = ut[i].family;
1525
1526		switch (ut[i].family) {
1527		case AF_INET:
1528			break;
1529#if IS_ENABLED(CONFIG_IPV6)
1530		case AF_INET6:
1531			break;
1532#endif
1533		default:
1534			return -EINVAL;
1535		}
1536
1537		if (!xfrm_id_proto_valid(ut[i].id.proto))
1538			return -EINVAL;
1539	}
1540
1541	return 0;
1542}
1543
1544static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1545{
1546	struct nlattr *rt = attrs[XFRMA_TMPL];
1547
1548	if (!rt) {
1549		pol->xfrm_nr = 0;
1550	} else {
1551		struct xfrm_user_tmpl *utmpl = nla_data(rt);
1552		int nr = nla_len(rt) / sizeof(*utmpl);
1553		int err;
1554
1555		err = validate_tmpl(nr, utmpl, pol->family);
1556		if (err)
1557			return err;
1558
1559		copy_templates(pol, utmpl, nr);
1560	}
1561	return 0;
1562}
1563
1564static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
1565{
1566	struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
1567	struct xfrm_userpolicy_type *upt;
1568	u8 type = XFRM_POLICY_TYPE_MAIN;
1569	int err;
1570
1571	if (rt) {
1572		upt = nla_data(rt);
1573		type = upt->type;
1574	}
1575
1576	err = verify_policy_type(type);
1577	if (err)
1578		return err;
1579
1580	*tp = type;
1581	return 0;
1582}
1583
1584static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1585{
1586	xp->priority = p->priority;
1587	xp->index = p->index;
1588	memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1589	memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1590	xp->action = p->action;
1591	xp->flags = p->flags;
1592	xp->family = p->sel.family;
1593	/* XXX xp->share = p->share; */
1594}
1595
1596static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1597{
1598	memset(p, 0, sizeof(*p));
1599	memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1600	memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1601	memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1602	p->priority = xp->priority;
1603	p->index = xp->index;
1604	p->sel.family = xp->family;
1605	p->dir = dir;
1606	p->action = xp->action;
1607	p->flags = xp->flags;
1608	p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1609}
1610
1611static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1612{
1613	struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
1614	int err;
1615
1616	if (!xp) {
1617		*errp = -ENOMEM;
1618		return NULL;
1619	}
1620
1621	copy_from_user_policy(xp, p);
1622
1623	err = copy_from_user_policy_type(&xp->type, attrs);
1624	if (err)
1625		goto error;
1626
1627	if (!(err = copy_from_user_tmpl(xp, attrs)))
1628		err = copy_from_user_sec_ctx(xp, attrs);
1629	if (err)
1630		goto error;
1631
1632	xfrm_mark_get(attrs, &xp->mark);
1633
1634	if (attrs[XFRMA_IF_ID])
1635		xp->if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
1636
1637	return xp;
1638 error:
1639	*errp = err;
1640	xp->walk.dead = 1;
1641	xfrm_policy_destroy(xp);
1642	return NULL;
1643}
1644
1645static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1646		struct nlattr **attrs)
1647{
1648	struct net *net = sock_net(skb->sk);
1649	struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1650	struct xfrm_policy *xp;
1651	struct km_event c;
1652	int err;
1653	int excl;
1654
1655	err = verify_newpolicy_info(p);
1656	if (err)
1657		return err;
1658	err = verify_sec_ctx_len(attrs);
1659	if (err)
1660		return err;
1661
1662	xp = xfrm_policy_construct(net, p, attrs, &err);
1663	if (!xp)
1664		return err;
1665
1666	/* shouldn't excl be based on nlh flags??
1667	 * Aha! this is anti-netlink really i.e  more pfkey derived
1668	 * in netlink excl is a flag and you wouldnt need
1669	 * a type XFRM_MSG_UPDPOLICY - JHS */
1670	excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1671	err = xfrm_policy_insert(p->dir, xp, excl);
1672	xfrm_audit_policy_add(xp, err ? 0 : 1, true);
1673
1674	if (err) {
1675		security_xfrm_policy_free(xp->security);
1676		kfree(xp);
1677		return err;
1678	}
1679
1680	c.event = nlh->nlmsg_type;
1681	c.seq = nlh->nlmsg_seq;
1682	c.portid = nlh->nlmsg_pid;
1683	km_policy_notify(xp, p->dir, &c);
1684
1685	xfrm_pol_put(xp);
1686
1687	return 0;
1688}
1689
1690static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1691{
1692	struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1693	int i;
1694
1695	if (xp->xfrm_nr == 0)
1696		return 0;
1697
1698	for (i = 0; i < xp->xfrm_nr; i++) {
1699		struct xfrm_user_tmpl *up = &vec[i];
1700		struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1701
1702		memset(up, 0, sizeof(*up));
1703		memcpy(&up->id, &kp->id, sizeof(up->id));
1704		up->family = kp->encap_family;
1705		memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1706		up->reqid = kp->reqid;
1707		up->mode = kp->mode;
1708		up->share = kp->share;
1709		up->optional = kp->optional;
1710		up->aalgos = kp->aalgos;
1711		up->ealgos = kp->ealgos;
1712		up->calgos = kp->calgos;
1713	}
1714
1715	return nla_put(skb, XFRMA_TMPL,
1716		       sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
1717}
1718
1719static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1720{
1721	if (x->security) {
1722		return copy_sec_ctx(x->security, skb);
1723	}
1724	return 0;
1725}
1726
1727static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1728{
1729	if (xp->security)
1730		return copy_sec_ctx(xp->security, skb);
1731	return 0;
1732}
1733static inline unsigned int userpolicy_type_attrsize(void)
1734{
1735#ifdef CONFIG_XFRM_SUB_POLICY
1736	return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1737#else
1738	return 0;
1739#endif
1740}
1741
1742#ifdef CONFIG_XFRM_SUB_POLICY
1743static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1744{
1745	struct xfrm_userpolicy_type upt;
1746
1747	/* Sadly there are two holes in struct xfrm_userpolicy_type */
1748	memset(&upt, 0, sizeof(upt));
1749	upt.type = type;
1750
1751	return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1752}
1753
1754#else
1755static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1756{
1757	return 0;
1758}
1759#endif
1760
1761static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1762{
1763	struct xfrm_dump_info *sp = ptr;
1764	struct xfrm_userpolicy_info *p;
1765	struct sk_buff *in_skb = sp->in_skb;
1766	struct sk_buff *skb = sp->out_skb;
 
1767	struct nlmsghdr *nlh;
1768	int err;
1769
1770	nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
1771			XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1772	if (nlh == NULL)
1773		return -EMSGSIZE;
1774
1775	p = nlmsg_data(nlh);
1776	copy_to_user_policy(xp, p, dir);
1777	err = copy_to_user_tmpl(xp, skb);
1778	if (!err)
1779		err = copy_to_user_sec_ctx(xp, skb);
1780	if (!err)
1781		err = copy_to_user_policy_type(xp->type, skb);
1782	if (!err)
1783		err = xfrm_mark_put(skb, &xp->mark);
1784	if (!err)
1785		err = xfrm_if_id_put(skb, xp->if_id);
1786	if (err) {
1787		nlmsg_cancel(skb, nlh);
1788		return err;
1789	}
1790	nlmsg_end(skb, nlh);
 
 
 
 
 
 
 
 
 
 
 
 
1791	return 0;
1792}
1793
1794static int xfrm_dump_policy_done(struct netlink_callback *cb)
1795{
1796	struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1797	struct net *net = sock_net(cb->skb->sk);
1798
1799	xfrm_policy_walk_done(walk, net);
1800	return 0;
1801}
1802
1803static int xfrm_dump_policy_start(struct netlink_callback *cb)
1804{
1805	struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1806
1807	BUILD_BUG_ON(sizeof(*walk) > sizeof(cb->args));
1808
1809	xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1810	return 0;
1811}
1812
1813static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1814{
1815	struct net *net = sock_net(skb->sk);
1816	struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1817	struct xfrm_dump_info info;
1818
1819	info.in_skb = cb->skb;
1820	info.out_skb = skb;
1821	info.nlmsg_seq = cb->nlh->nlmsg_seq;
1822	info.nlmsg_flags = NLM_F_MULTI;
1823
1824	(void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
1825
1826	return skb->len;
1827}
1828
1829static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1830					  struct xfrm_policy *xp,
1831					  int dir, u32 seq)
1832{
1833	struct xfrm_dump_info info;
1834	struct sk_buff *skb;
1835	int err;
1836
1837	skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1838	if (!skb)
1839		return ERR_PTR(-ENOMEM);
1840
1841	info.in_skb = in_skb;
1842	info.out_skb = skb;
1843	info.nlmsg_seq = seq;
1844	info.nlmsg_flags = 0;
1845
1846	err = dump_one_policy(xp, dir, 0, &info);
1847	if (err) {
1848		kfree_skb(skb);
1849		return ERR_PTR(err);
1850	}
1851
1852	return skb;
1853}
1854
1855static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1856		struct nlattr **attrs)
1857{
1858	struct net *net = sock_net(skb->sk);
1859	struct xfrm_policy *xp;
1860	struct xfrm_userpolicy_id *p;
1861	u8 type = XFRM_POLICY_TYPE_MAIN;
1862	int err;
1863	struct km_event c;
1864	int delete;
1865	struct xfrm_mark m;
1866	u32 if_id = 0;
1867
1868	p = nlmsg_data(nlh);
1869	delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1870
1871	err = copy_from_user_policy_type(&type, attrs);
1872	if (err)
1873		return err;
1874
1875	err = verify_policy_dir(p->dir);
1876	if (err)
1877		return err;
1878
1879	if (attrs[XFRMA_IF_ID])
1880		if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
1881
1882	xfrm_mark_get(attrs, &m);
1883
1884	if (p->index)
1885		xp = xfrm_policy_byid(net, &m, if_id, type, p->dir,
1886				      p->index, delete, &err);
1887	else {
1888		struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1889		struct xfrm_sec_ctx *ctx;
1890
1891		err = verify_sec_ctx_len(attrs);
1892		if (err)
1893			return err;
1894
1895		ctx = NULL;
1896		if (rt) {
1897			struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1898
1899			err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
1900			if (err)
1901				return err;
1902		}
1903		xp = xfrm_policy_bysel_ctx(net, &m, if_id, type, p->dir,
1904					   &p->sel, ctx, delete, &err);
1905		security_xfrm_policy_free(ctx);
1906	}
1907	if (xp == NULL)
1908		return -ENOENT;
1909
1910	if (!delete) {
1911		struct sk_buff *resp_skb;
1912
1913		resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1914		if (IS_ERR(resp_skb)) {
1915			err = PTR_ERR(resp_skb);
1916		} else {
1917			err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
1918					    NETLINK_CB(skb).portid);
1919		}
1920	} else {
1921		xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
1922
1923		if (err != 0)
1924			goto out;
1925
1926		c.data.byid = p->index;
1927		c.event = nlh->nlmsg_type;
1928		c.seq = nlh->nlmsg_seq;
1929		c.portid = nlh->nlmsg_pid;
1930		km_policy_notify(xp, p->dir, &c);
1931	}
1932
1933out:
1934	xfrm_pol_put(xp);
1935	return err;
1936}
1937
1938static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1939		struct nlattr **attrs)
1940{
1941	struct net *net = sock_net(skb->sk);
1942	struct km_event c;
1943	struct xfrm_usersa_flush *p = nlmsg_data(nlh);
1944	int err;
1945
1946	err = xfrm_state_flush(net, p->proto, true, false);
1947	if (err) {
1948		if (err == -ESRCH) /* empty table */
1949			return 0;
1950		return err;
1951	}
1952	c.data.proto = p->proto;
1953	c.event = nlh->nlmsg_type;
1954	c.seq = nlh->nlmsg_seq;
1955	c.portid = nlh->nlmsg_pid;
1956	c.net = net;
1957	km_state_notify(NULL, &c);
1958
1959	return 0;
1960}
1961
1962static inline unsigned int xfrm_aevent_msgsize(struct xfrm_state *x)
1963{
1964	unsigned int replay_size = x->replay_esn ?
1965			      xfrm_replay_state_esn_len(x->replay_esn) :
1966			      sizeof(struct xfrm_replay_state);
1967
1968	return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
1969	       + nla_total_size(replay_size)
1970	       + nla_total_size_64bit(sizeof(struct xfrm_lifetime_cur))
1971	       + nla_total_size(sizeof(struct xfrm_mark))
1972	       + nla_total_size(4) /* XFRM_AE_RTHR */
1973	       + nla_total_size(4); /* XFRM_AE_ETHR */
1974}
1975
1976static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
1977{
1978	struct xfrm_aevent_id *id;
1979	struct nlmsghdr *nlh;
1980	int err;
1981
1982	nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
1983	if (nlh == NULL)
1984		return -EMSGSIZE;
1985
1986	id = nlmsg_data(nlh);
1987	memset(&id->sa_id, 0, sizeof(id->sa_id));
1988	memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr));
1989	id->sa_id.spi = x->id.spi;
1990	id->sa_id.family = x->props.family;
1991	id->sa_id.proto = x->id.proto;
1992	memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr));
1993	id->reqid = x->props.reqid;
1994	id->flags = c->data.aevent;
1995
1996	if (x->replay_esn) {
1997		err = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
1998			      xfrm_replay_state_esn_len(x->replay_esn),
1999			      x->replay_esn);
2000	} else {
2001		err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
2002			      &x->replay);
2003	}
2004	if (err)
2005		goto out_cancel;
2006	err = nla_put_64bit(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft,
2007			    XFRMA_PAD);
2008	if (err)
2009		goto out_cancel;
2010
2011	if (id->flags & XFRM_AE_RTHR) {
2012		err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
2013		if (err)
2014			goto out_cancel;
2015	}
2016	if (id->flags & XFRM_AE_ETHR) {
2017		err = nla_put_u32(skb, XFRMA_ETIMER_THRESH,
2018				  x->replay_maxage * 10 / HZ);
2019		if (err)
2020			goto out_cancel;
2021	}
2022	err = xfrm_mark_put(skb, &x->mark);
2023	if (err)
2024		goto out_cancel;
2025
2026	err = xfrm_if_id_put(skb, x->if_id);
2027	if (err)
2028		goto out_cancel;
2029
2030	nlmsg_end(skb, nlh);
2031	return 0;
2032
2033out_cancel:
2034	nlmsg_cancel(skb, nlh);
2035	return err;
2036}
2037
2038static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
2039		struct nlattr **attrs)
2040{
2041	struct net *net = sock_net(skb->sk);
2042	struct xfrm_state *x;
2043	struct sk_buff *r_skb;
2044	int err;
2045	struct km_event c;
2046	u32 mark;
2047	struct xfrm_mark m;
2048	struct xfrm_aevent_id *p = nlmsg_data(nlh);
2049	struct xfrm_usersa_id *id = &p->sa_id;
2050
2051	mark = xfrm_mark_get(attrs, &m);
2052
2053	x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
2054	if (x == NULL)
2055		return -ESRCH;
2056
2057	r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2058	if (r_skb == NULL) {
2059		xfrm_state_put(x);
2060		return -ENOMEM;
2061	}
2062
2063	/*
2064	 * XXX: is this lock really needed - none of the other
2065	 * gets lock (the concern is things getting updated
2066	 * while we are still reading) - jhs
2067	*/
2068	spin_lock_bh(&x->lock);
2069	c.data.aevent = p->flags;
2070	c.seq = nlh->nlmsg_seq;
2071	c.portid = nlh->nlmsg_pid;
2072
2073	err = build_aevent(r_skb, x, &c);
2074	BUG_ON(err < 0);
2075
2076	err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid);
2077	spin_unlock_bh(&x->lock);
2078	xfrm_state_put(x);
2079	return err;
2080}
2081
2082static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
2083		struct nlattr **attrs)
2084{
2085	struct net *net = sock_net(skb->sk);
2086	struct xfrm_state *x;
2087	struct km_event c;
2088	int err = -EINVAL;
2089	u32 mark = 0;
2090	struct xfrm_mark m;
2091	struct xfrm_aevent_id *p = nlmsg_data(nlh);
2092	struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
2093	struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
2094	struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
2095	struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
2096	struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
2097
2098	if (!lt && !rp && !re && !et && !rt)
2099		return err;
2100
2101	/* pedantic mode - thou shalt sayeth replaceth */
2102	if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
2103		return err;
2104
2105	mark = xfrm_mark_get(attrs, &m);
2106
2107	x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
2108	if (x == NULL)
2109		return -ESRCH;
2110
2111	if (x->km.state != XFRM_STATE_VALID)
2112		goto out;
2113
2114	err = xfrm_replay_verify_len(x->replay_esn, re);
2115	if (err)
2116		goto out;
2117
2118	spin_lock_bh(&x->lock);
2119	xfrm_update_ae_params(x, attrs, 1);
2120	spin_unlock_bh(&x->lock);
2121
2122	c.event = nlh->nlmsg_type;
2123	c.seq = nlh->nlmsg_seq;
2124	c.portid = nlh->nlmsg_pid;
2125	c.data.aevent = XFRM_AE_CU;
2126	km_state_notify(x, &c);
2127	err = 0;
2128out:
2129	xfrm_state_put(x);
2130	return err;
2131}
2132
2133static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
2134		struct nlattr **attrs)
2135{
2136	struct net *net = sock_net(skb->sk);
2137	struct km_event c;
2138	u8 type = XFRM_POLICY_TYPE_MAIN;
2139	int err;
2140
2141	err = copy_from_user_policy_type(&type, attrs);
2142	if (err)
2143		return err;
2144
2145	err = xfrm_policy_flush(net, type, true);
2146	if (err) {
2147		if (err == -ESRCH) /* empty table */
2148			return 0;
2149		return err;
2150	}
2151
2152	c.data.type = type;
2153	c.event = nlh->nlmsg_type;
2154	c.seq = nlh->nlmsg_seq;
2155	c.portid = nlh->nlmsg_pid;
2156	c.net = net;
2157	km_policy_notify(NULL, 0, &c);
2158	return 0;
2159}
2160
2161static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2162		struct nlattr **attrs)
2163{
2164	struct net *net = sock_net(skb->sk);
2165	struct xfrm_policy *xp;
2166	struct xfrm_user_polexpire *up = nlmsg_data(nlh);
2167	struct xfrm_userpolicy_info *p = &up->pol;
2168	u8 type = XFRM_POLICY_TYPE_MAIN;
2169	int err = -ENOENT;
2170	struct xfrm_mark m;
2171	u32 if_id = 0;
2172
2173	err = copy_from_user_policy_type(&type, attrs);
2174	if (err)
2175		return err;
2176
2177	err = verify_policy_dir(p->dir);
2178	if (err)
2179		return err;
2180
2181	if (attrs[XFRMA_IF_ID])
2182		if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
2183
2184	xfrm_mark_get(attrs, &m);
2185
2186	if (p->index)
2187		xp = xfrm_policy_byid(net, &m, if_id, type, p->dir, p->index,
2188				      0, &err);
2189	else {
2190		struct nlattr *rt = attrs[XFRMA_SEC_CTX];
2191		struct xfrm_sec_ctx *ctx;
2192
2193		err = verify_sec_ctx_len(attrs);
2194		if (err)
2195			return err;
2196
2197		ctx = NULL;
2198		if (rt) {
2199			struct xfrm_user_sec_ctx *uctx = nla_data(rt);
2200
2201			err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
2202			if (err)
2203				return err;
2204		}
2205		xp = xfrm_policy_bysel_ctx(net, &m, if_id, type, p->dir,
2206					   &p->sel, ctx, 0, &err);
2207		security_xfrm_policy_free(ctx);
2208	}
2209	if (xp == NULL)
2210		return -ENOENT;
2211
2212	if (unlikely(xp->walk.dead))
2213		goto out;
2214
2215	err = 0;
2216	if (up->hard) {
2217		xfrm_policy_delete(xp, p->dir);
2218		xfrm_audit_policy_delete(xp, 1, true);
2219	}
2220	km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid);
2221
2222out:
2223	xfrm_pol_put(xp);
2224	return err;
2225}
2226
2227static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2228		struct nlattr **attrs)
2229{
2230	struct net *net = sock_net(skb->sk);
2231	struct xfrm_state *x;
2232	int err;
2233	struct xfrm_user_expire *ue = nlmsg_data(nlh);
2234	struct xfrm_usersa_info *p = &ue->state;
2235	struct xfrm_mark m;
2236	u32 mark = xfrm_mark_get(attrs, &m);
2237
2238	x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
2239
2240	err = -ENOENT;
2241	if (x == NULL)
2242		return err;
2243
2244	spin_lock_bh(&x->lock);
2245	err = -EINVAL;
2246	if (x->km.state != XFRM_STATE_VALID)
2247		goto out;
2248	km_state_expired(x, ue->hard, nlh->nlmsg_pid);
2249
2250	if (ue->hard) {
2251		__xfrm_state_delete(x);
2252		xfrm_audit_state_delete(x, 1, true);
2253	}
2254	err = 0;
2255out:
2256	spin_unlock_bh(&x->lock);
2257	xfrm_state_put(x);
2258	return err;
2259}
2260
2261static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
2262		struct nlattr **attrs)
2263{
2264	struct net *net = sock_net(skb->sk);
2265	struct xfrm_policy *xp;
2266	struct xfrm_user_tmpl *ut;
2267	int i;
2268	struct nlattr *rt = attrs[XFRMA_TMPL];
2269	struct xfrm_mark mark;
2270
2271	struct xfrm_user_acquire *ua = nlmsg_data(nlh);
2272	struct xfrm_state *x = xfrm_state_alloc(net);
2273	int err = -ENOMEM;
2274
2275	if (!x)
2276		goto nomem;
2277
2278	xfrm_mark_get(attrs, &mark);
2279
2280	err = verify_newpolicy_info(&ua->policy);
2281	if (err)
2282		goto free_state;
2283	err = verify_sec_ctx_len(attrs);
2284	if (err)
2285		goto free_state;
2286
2287	/*   build an XP */
2288	xp = xfrm_policy_construct(net, &ua->policy, attrs, &err);
2289	if (!xp)
2290		goto free_state;
2291
2292	memcpy(&x->id, &ua->id, sizeof(ua->id));
2293	memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
2294	memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
2295	xp->mark.m = x->mark.m = mark.m;
2296	xp->mark.v = x->mark.v = mark.v;
2297	ut = nla_data(rt);
2298	/* extract the templates and for each call km_key */
2299	for (i = 0; i < xp->xfrm_nr; i++, ut++) {
2300		struct xfrm_tmpl *t = &xp->xfrm_vec[i];
2301		memcpy(&x->id, &t->id, sizeof(x->id));
2302		x->props.mode = t->mode;
2303		x->props.reqid = t->reqid;
2304		x->props.family = ut->family;
2305		t->aalgos = ua->aalgos;
2306		t->ealgos = ua->ealgos;
2307		t->calgos = ua->calgos;
2308		err = km_query(x, t, xp);
2309
2310	}
2311
2312	xfrm_state_free(x);
2313	kfree(xp);
2314
2315	return 0;
2316
2317free_state:
2318	xfrm_state_free(x);
2319nomem:
2320	return err;
2321}
2322
2323#ifdef CONFIG_XFRM_MIGRATE
2324static int copy_from_user_migrate(struct xfrm_migrate *ma,
2325				  struct xfrm_kmaddress *k,
2326				  struct nlattr **attrs, int *num)
2327{
2328	struct nlattr *rt = attrs[XFRMA_MIGRATE];
2329	struct xfrm_user_migrate *um;
2330	int i, num_migrate;
2331
2332	if (k != NULL) {
2333		struct xfrm_user_kmaddress *uk;
2334
2335		uk = nla_data(attrs[XFRMA_KMADDRESS]);
2336		memcpy(&k->local, &uk->local, sizeof(k->local));
2337		memcpy(&k->remote, &uk->remote, sizeof(k->remote));
2338		k->family = uk->family;
2339		k->reserved = uk->reserved;
2340	}
2341
2342	um = nla_data(rt);
2343	num_migrate = nla_len(rt) / sizeof(*um);
2344
2345	if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
2346		return -EINVAL;
2347
2348	for (i = 0; i < num_migrate; i++, um++, ma++) {
2349		memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
2350		memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
2351		memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
2352		memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
2353
2354		ma->proto = um->proto;
2355		ma->mode = um->mode;
2356		ma->reqid = um->reqid;
2357
2358		ma->old_family = um->old_family;
2359		ma->new_family = um->new_family;
2360	}
2361
2362	*num = i;
2363	return 0;
2364}
2365
2366static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2367			   struct nlattr **attrs)
2368{
2369	struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
2370	struct xfrm_migrate m[XFRM_MAX_DEPTH];
2371	struct xfrm_kmaddress km, *kmp;
2372	u8 type;
2373	int err;
2374	int n = 0;
2375	struct net *net = sock_net(skb->sk);
2376	struct xfrm_encap_tmpl  *encap = NULL;
2377
2378	if (attrs[XFRMA_MIGRATE] == NULL)
2379		return -EINVAL;
2380
2381	kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
2382
2383	err = copy_from_user_policy_type(&type, attrs);
2384	if (err)
2385		return err;
2386
2387	err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
2388	if (err)
2389		return err;
2390
2391	if (!n)
2392		return 0;
2393
2394	if (attrs[XFRMA_ENCAP]) {
2395		encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
2396				sizeof(*encap), GFP_KERNEL);
2397		if (!encap)
2398			return 0;
2399	}
2400
2401	err = xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net, encap);
2402
2403	kfree(encap);
2404
2405	return err;
2406}
2407#else
2408static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2409			   struct nlattr **attrs)
2410{
2411	return -ENOPROTOOPT;
2412}
2413#endif
2414
2415#ifdef CONFIG_XFRM_MIGRATE
2416static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
2417{
2418	struct xfrm_user_migrate um;
2419
2420	memset(&um, 0, sizeof(um));
2421	um.proto = m->proto;
2422	um.mode = m->mode;
2423	um.reqid = m->reqid;
2424	um.old_family = m->old_family;
2425	memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
2426	memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
2427	um.new_family = m->new_family;
2428	memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
2429	memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
2430
2431	return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
2432}
2433
2434static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
2435{
2436	struct xfrm_user_kmaddress uk;
2437
2438	memset(&uk, 0, sizeof(uk));
2439	uk.family = k->family;
2440	uk.reserved = k->reserved;
2441	memcpy(&uk.local, &k->local, sizeof(uk.local));
2442	memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
2443
2444	return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
2445}
2446
2447static inline unsigned int xfrm_migrate_msgsize(int num_migrate, int with_kma,
2448						int with_encp)
2449{
2450	return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
2451	      + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
2452	      + (with_encp ? nla_total_size(sizeof(struct xfrm_encap_tmpl)) : 0)
2453	      + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
2454	      + userpolicy_type_attrsize();
2455}
2456
2457static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
2458			 int num_migrate, const struct xfrm_kmaddress *k,
2459			 const struct xfrm_selector *sel,
2460			 const struct xfrm_encap_tmpl *encap, u8 dir, u8 type)
2461{
2462	const struct xfrm_migrate *mp;
2463	struct xfrm_userpolicy_id *pol_id;
2464	struct nlmsghdr *nlh;
2465	int i, err;
2466
2467	nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
2468	if (nlh == NULL)
2469		return -EMSGSIZE;
2470
2471	pol_id = nlmsg_data(nlh);
2472	/* copy data from selector, dir, and type to the pol_id */
2473	memset(pol_id, 0, sizeof(*pol_id));
2474	memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
2475	pol_id->dir = dir;
2476
2477	if (k != NULL) {
2478		err = copy_to_user_kmaddress(k, skb);
2479		if (err)
2480			goto out_cancel;
2481	}
2482	if (encap) {
2483		err = nla_put(skb, XFRMA_ENCAP, sizeof(*encap), encap);
2484		if (err)
2485			goto out_cancel;
2486	}
2487	err = copy_to_user_policy_type(type, skb);
2488	if (err)
2489		goto out_cancel;
2490	for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
2491		err = copy_to_user_migrate(mp, skb);
2492		if (err)
2493			goto out_cancel;
2494	}
2495
2496	nlmsg_end(skb, nlh);
2497	return 0;
2498
2499out_cancel:
2500	nlmsg_cancel(skb, nlh);
2501	return err;
2502}
2503
2504static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2505			     const struct xfrm_migrate *m, int num_migrate,
2506			     const struct xfrm_kmaddress *k,
2507			     const struct xfrm_encap_tmpl *encap)
2508{
2509	struct net *net = &init_net;
2510	struct sk_buff *skb;
2511	int err;
2512
2513	skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k, !!encap),
2514			GFP_ATOMIC);
2515	if (skb == NULL)
2516		return -ENOMEM;
2517
2518	/* build migrate */
2519	err = build_migrate(skb, m, num_migrate, k, sel, encap, dir, type);
2520	BUG_ON(err < 0);
2521
2522	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE);
2523}
2524#else
2525static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2526			     const struct xfrm_migrate *m, int num_migrate,
2527			     const struct xfrm_kmaddress *k,
2528			     const struct xfrm_encap_tmpl *encap)
2529{
2530	return -ENOPROTOOPT;
2531}
2532#endif
2533
2534#define XMSGSIZE(type) sizeof(struct type)
2535
2536static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
2537	[XFRM_MSG_NEWSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2538	[XFRM_MSG_DELSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2539	[XFRM_MSG_GETSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2540	[XFRM_MSG_NEWPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2541	[XFRM_MSG_DELPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2542	[XFRM_MSG_GETPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2543	[XFRM_MSG_ALLOCSPI    - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
2544	[XFRM_MSG_ACQUIRE     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
2545	[XFRM_MSG_EXPIRE      - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
2546	[XFRM_MSG_UPDPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2547	[XFRM_MSG_UPDSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2548	[XFRM_MSG_POLEXPIRE   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
2549	[XFRM_MSG_FLUSHSA     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
2550	[XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
2551	[XFRM_MSG_NEWAE       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2552	[XFRM_MSG_GETAE       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2553	[XFRM_MSG_REPORT      - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
2554	[XFRM_MSG_MIGRATE     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2555	[XFRM_MSG_GETSADINFO  - XFRM_MSG_BASE] = sizeof(u32),
2556	[XFRM_MSG_NEWSPDINFO  - XFRM_MSG_BASE] = sizeof(u32),
2557	[XFRM_MSG_GETSPDINFO  - XFRM_MSG_BASE] = sizeof(u32),
2558};
 
2559
2560#undef XMSGSIZE
2561
2562static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
2563	[XFRMA_SA]		= { .len = sizeof(struct xfrm_usersa_info)},
2564	[XFRMA_POLICY]		= { .len = sizeof(struct xfrm_userpolicy_info)},
2565	[XFRMA_LASTUSED]	= { .type = NLA_U64},
2566	[XFRMA_ALG_AUTH_TRUNC]	= { .len = sizeof(struct xfrm_algo_auth)},
2567	[XFRMA_ALG_AEAD]	= { .len = sizeof(struct xfrm_algo_aead) },
2568	[XFRMA_ALG_AUTH]	= { .len = sizeof(struct xfrm_algo) },
2569	[XFRMA_ALG_CRYPT]	= { .len = sizeof(struct xfrm_algo) },
2570	[XFRMA_ALG_COMP]	= { .len = sizeof(struct xfrm_algo) },
2571	[XFRMA_ENCAP]		= { .len = sizeof(struct xfrm_encap_tmpl) },
2572	[XFRMA_TMPL]		= { .len = sizeof(struct xfrm_user_tmpl) },
2573	[XFRMA_SEC_CTX]		= { .len = sizeof(struct xfrm_sec_ctx) },
2574	[XFRMA_LTIME_VAL]	= { .len = sizeof(struct xfrm_lifetime_cur) },
2575	[XFRMA_REPLAY_VAL]	= { .len = sizeof(struct xfrm_replay_state) },
2576	[XFRMA_REPLAY_THRESH]	= { .type = NLA_U32 },
2577	[XFRMA_ETIMER_THRESH]	= { .type = NLA_U32 },
2578	[XFRMA_SRCADDR]		= { .len = sizeof(xfrm_address_t) },
2579	[XFRMA_COADDR]		= { .len = sizeof(xfrm_address_t) },
2580	[XFRMA_POLICY_TYPE]	= { .len = sizeof(struct xfrm_userpolicy_type)},
2581	[XFRMA_MIGRATE]		= { .len = sizeof(struct xfrm_user_migrate) },
2582	[XFRMA_KMADDRESS]	= { .len = sizeof(struct xfrm_user_kmaddress) },
2583	[XFRMA_MARK]		= { .len = sizeof(struct xfrm_mark) },
2584	[XFRMA_TFCPAD]		= { .type = NLA_U32 },
2585	[XFRMA_REPLAY_ESN_VAL]	= { .len = sizeof(struct xfrm_replay_state_esn) },
2586	[XFRMA_SA_EXTRA_FLAGS]	= { .type = NLA_U32 },
2587	[XFRMA_PROTO]		= { .type = NLA_U8 },
2588	[XFRMA_ADDRESS_FILTER]	= { .len = sizeof(struct xfrm_address_filter) },
2589	[XFRMA_OFFLOAD_DEV]	= { .len = sizeof(struct xfrm_user_offload) },
2590	[XFRMA_SET_MARK]	= { .type = NLA_U32 },
2591	[XFRMA_SET_MARK_MASK]	= { .type = NLA_U32 },
2592	[XFRMA_IF_ID]		= { .type = NLA_U32 },
2593};
 
2594
2595static const struct nla_policy xfrma_spd_policy[XFRMA_SPD_MAX+1] = {
2596	[XFRMA_SPD_IPV4_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2597	[XFRMA_SPD_IPV6_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2598};
2599
2600static const struct xfrm_link {
2601	int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
2602	int (*start)(struct netlink_callback *);
2603	int (*dump)(struct sk_buff *, struct netlink_callback *);
2604	int (*done)(struct netlink_callback *);
2605	const struct nla_policy *nla_pol;
2606	int nla_max;
2607} xfrm_dispatch[XFRM_NR_MSGTYPES] = {
2608	[XFRM_MSG_NEWSA       - XFRM_MSG_BASE] = { .doit = xfrm_add_sa        },
2609	[XFRM_MSG_DELSA       - XFRM_MSG_BASE] = { .doit = xfrm_del_sa        },
2610	[XFRM_MSG_GETSA       - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
2611						   .dump = xfrm_dump_sa,
2612						   .done = xfrm_dump_sa_done  },
2613	[XFRM_MSG_NEWPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_add_policy    },
2614	[XFRM_MSG_DELPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_get_policy    },
2615	[XFRM_MSG_GETPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
2616						   .start = xfrm_dump_policy_start,
2617						   .dump = xfrm_dump_policy,
2618						   .done = xfrm_dump_policy_done },
2619	[XFRM_MSG_ALLOCSPI    - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
2620	[XFRM_MSG_ACQUIRE     - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire   },
2621	[XFRM_MSG_EXPIRE      - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
2622	[XFRM_MSG_UPDPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_add_policy    },
2623	[XFRM_MSG_UPDSA       - XFRM_MSG_BASE] = { .doit = xfrm_add_sa        },
2624	[XFRM_MSG_POLEXPIRE   - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
2625	[XFRM_MSG_FLUSHSA     - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa      },
2626	[XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy  },
2627	[XFRM_MSG_NEWAE       - XFRM_MSG_BASE] = { .doit = xfrm_new_ae  },
2628	[XFRM_MSG_GETAE       - XFRM_MSG_BASE] = { .doit = xfrm_get_ae  },
2629	[XFRM_MSG_MIGRATE     - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate    },
2630	[XFRM_MSG_GETSADINFO  - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo   },
2631	[XFRM_MSG_NEWSPDINFO  - XFRM_MSG_BASE] = { .doit = xfrm_set_spdinfo,
2632						   .nla_pol = xfrma_spd_policy,
2633						   .nla_max = XFRMA_SPD_MAX },
2634	[XFRM_MSG_GETSPDINFO  - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo   },
2635};
2636
2637static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
2638			     struct netlink_ext_ack *extack)
2639{
2640	struct net *net = sock_net(skb->sk);
2641	struct nlattr *attrs[XFRMA_MAX+1];
2642	const struct xfrm_link *link;
 
2643	int type, err;
2644
2645	if (in_compat_syscall())
2646		return -EOPNOTSUPP;
2647
2648	type = nlh->nlmsg_type;
2649	if (type > XFRM_MSG_MAX)
2650		return -EINVAL;
2651
2652	type -= XFRM_MSG_BASE;
2653	link = &xfrm_dispatch[type];
2654
2655	/* All operations require privileges, even GET */
2656	if (!netlink_net_capable(skb, CAP_NET_ADMIN))
2657		return -EPERM;
2658
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2659	if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
2660	     type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
2661	    (nlh->nlmsg_flags & NLM_F_DUMP)) {
2662		if (link->dump == NULL)
2663			return -EINVAL;
 
 
 
2664
2665		{
2666			struct netlink_dump_control c = {
2667				.start = link->start,
2668				.dump = link->dump,
2669				.done = link->done,
2670			};
2671			return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
2672		}
 
 
 
2673	}
2674
2675	err = nlmsg_parse_deprecated(nlh, xfrm_msg_min[type], attrs,
2676				     link->nla_max ? : XFRMA_MAX,
2677				     link->nla_pol ? : xfrma_policy, extack);
2678	if (err < 0)
2679		return err;
2680
2681	if (link->doit == NULL)
2682		return -EINVAL;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2683
2684	return link->doit(skb, nlh, attrs);
 
 
2685}
2686
2687static void xfrm_netlink_rcv(struct sk_buff *skb)
2688{
2689	struct net *net = sock_net(skb->sk);
2690
2691	mutex_lock(&net->xfrm.xfrm_cfg_mutex);
2692	netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
2693	mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
2694}
2695
2696static inline unsigned int xfrm_expire_msgsize(void)
2697{
2698	return NLMSG_ALIGN(sizeof(struct xfrm_user_expire))
2699	       + nla_total_size(sizeof(struct xfrm_mark));
2700}
2701
2702static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
2703{
2704	struct xfrm_user_expire *ue;
2705	struct nlmsghdr *nlh;
2706	int err;
2707
2708	nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
2709	if (nlh == NULL)
2710		return -EMSGSIZE;
2711
2712	ue = nlmsg_data(nlh);
2713	copy_to_user_state(x, &ue->state);
2714	ue->hard = (c->data.hard != 0) ? 1 : 0;
2715	/* clear the padding bytes */
2716	memset(&ue->hard + 1, 0, sizeof(*ue) - offsetofend(typeof(*ue), hard));
2717
2718	err = xfrm_mark_put(skb, &x->mark);
2719	if (err)
2720		return err;
2721
2722	err = xfrm_if_id_put(skb, x->if_id);
2723	if (err)
2724		return err;
2725
2726	nlmsg_end(skb, nlh);
2727	return 0;
2728}
2729
2730static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
2731{
2732	struct net *net = xs_net(x);
2733	struct sk_buff *skb;
2734
2735	skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
2736	if (skb == NULL)
2737		return -ENOMEM;
2738
2739	if (build_expire(skb, x, c) < 0) {
2740		kfree_skb(skb);
2741		return -EMSGSIZE;
2742	}
2743
2744	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
2745}
2746
2747static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
2748{
2749	struct net *net = xs_net(x);
2750	struct sk_buff *skb;
2751	int err;
2752
2753	skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2754	if (skb == NULL)
2755		return -ENOMEM;
2756
2757	err = build_aevent(skb, x, c);
2758	BUG_ON(err < 0);
2759
2760	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS);
2761}
2762
2763static int xfrm_notify_sa_flush(const struct km_event *c)
2764{
2765	struct net *net = c->net;
2766	struct xfrm_usersa_flush *p;
2767	struct nlmsghdr *nlh;
2768	struct sk_buff *skb;
2769	int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
2770
2771	skb = nlmsg_new(len, GFP_ATOMIC);
2772	if (skb == NULL)
2773		return -ENOMEM;
2774
2775	nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
2776	if (nlh == NULL) {
2777		kfree_skb(skb);
2778		return -EMSGSIZE;
2779	}
2780
2781	p = nlmsg_data(nlh);
2782	p->proto = c->data.proto;
2783
2784	nlmsg_end(skb, nlh);
2785
2786	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
2787}
2788
2789static inline unsigned int xfrm_sa_len(struct xfrm_state *x)
2790{
2791	unsigned int l = 0;
2792	if (x->aead)
2793		l += nla_total_size(aead_len(x->aead));
2794	if (x->aalg) {
2795		l += nla_total_size(sizeof(struct xfrm_algo) +
2796				    (x->aalg->alg_key_len + 7) / 8);
2797		l += nla_total_size(xfrm_alg_auth_len(x->aalg));
2798	}
2799	if (x->ealg)
2800		l += nla_total_size(xfrm_alg_len(x->ealg));
2801	if (x->calg)
2802		l += nla_total_size(sizeof(*x->calg));
2803	if (x->encap)
2804		l += nla_total_size(sizeof(*x->encap));
2805	if (x->tfcpad)
2806		l += nla_total_size(sizeof(x->tfcpad));
2807	if (x->replay_esn)
2808		l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
2809	else
2810		l += nla_total_size(sizeof(struct xfrm_replay_state));
2811	if (x->security)
2812		l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2813				    x->security->ctx_len);
2814	if (x->coaddr)
2815		l += nla_total_size(sizeof(*x->coaddr));
2816	if (x->props.extra_flags)
2817		l += nla_total_size(sizeof(x->props.extra_flags));
2818	if (x->xso.dev)
2819		 l += nla_total_size(sizeof(x->xso));
2820	if (x->props.smark.v | x->props.smark.m) {
2821		l += nla_total_size(sizeof(x->props.smark.v));
2822		l += nla_total_size(sizeof(x->props.smark.m));
2823	}
2824	if (x->if_id)
2825		l += nla_total_size(sizeof(x->if_id));
2826
2827	/* Must count x->lastused as it may become non-zero behind our back. */
2828	l += nla_total_size_64bit(sizeof(u64));
2829
2830	return l;
2831}
2832
2833static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
2834{
2835	struct net *net = xs_net(x);
2836	struct xfrm_usersa_info *p;
2837	struct xfrm_usersa_id *id;
2838	struct nlmsghdr *nlh;
2839	struct sk_buff *skb;
2840	unsigned int len = xfrm_sa_len(x);
2841	unsigned int headlen;
2842	int err;
2843
2844	headlen = sizeof(*p);
2845	if (c->event == XFRM_MSG_DELSA) {
2846		len += nla_total_size(headlen);
2847		headlen = sizeof(*id);
2848		len += nla_total_size(sizeof(struct xfrm_mark));
2849	}
2850	len += NLMSG_ALIGN(headlen);
2851
2852	skb = nlmsg_new(len, GFP_ATOMIC);
2853	if (skb == NULL)
2854		return -ENOMEM;
2855
2856	nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
2857	err = -EMSGSIZE;
2858	if (nlh == NULL)
2859		goto out_free_skb;
2860
2861	p = nlmsg_data(nlh);
2862	if (c->event == XFRM_MSG_DELSA) {
2863		struct nlattr *attr;
2864
2865		id = nlmsg_data(nlh);
2866		memset(id, 0, sizeof(*id));
2867		memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2868		id->spi = x->id.spi;
2869		id->family = x->props.family;
2870		id->proto = x->id.proto;
2871
2872		attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
2873		err = -EMSGSIZE;
2874		if (attr == NULL)
2875			goto out_free_skb;
2876
2877		p = nla_data(attr);
2878	}
2879	err = copy_to_user_state_extra(x, p, skb);
2880	if (err)
2881		goto out_free_skb;
2882
2883	nlmsg_end(skb, nlh);
2884
2885	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
2886
2887out_free_skb:
2888	kfree_skb(skb);
2889	return err;
2890}
2891
2892static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
2893{
2894
2895	switch (c->event) {
2896	case XFRM_MSG_EXPIRE:
2897		return xfrm_exp_state_notify(x, c);
2898	case XFRM_MSG_NEWAE:
2899		return xfrm_aevent_state_notify(x, c);
2900	case XFRM_MSG_DELSA:
2901	case XFRM_MSG_UPDSA:
2902	case XFRM_MSG_NEWSA:
2903		return xfrm_notify_sa(x, c);
2904	case XFRM_MSG_FLUSHSA:
2905		return xfrm_notify_sa_flush(c);
2906	default:
2907		printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
2908		       c->event);
2909		break;
2910	}
2911
2912	return 0;
2913
2914}
2915
2916static inline unsigned int xfrm_acquire_msgsize(struct xfrm_state *x,
2917						struct xfrm_policy *xp)
2918{
2919	return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
2920	       + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2921	       + nla_total_size(sizeof(struct xfrm_mark))
2922	       + nla_total_size(xfrm_user_sec_ctx_size(x->security))
2923	       + userpolicy_type_attrsize();
2924}
2925
2926static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
2927			 struct xfrm_tmpl *xt, struct xfrm_policy *xp)
2928{
2929	__u32 seq = xfrm_get_acqseq();
2930	struct xfrm_user_acquire *ua;
2931	struct nlmsghdr *nlh;
2932	int err;
2933
2934	nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
2935	if (nlh == NULL)
2936		return -EMSGSIZE;
2937
2938	ua = nlmsg_data(nlh);
2939	memcpy(&ua->id, &x->id, sizeof(ua->id));
2940	memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2941	memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
2942	copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT);
2943	ua->aalgos = xt->aalgos;
2944	ua->ealgos = xt->ealgos;
2945	ua->calgos = xt->calgos;
2946	ua->seq = x->km.seq = seq;
2947
2948	err = copy_to_user_tmpl(xp, skb);
2949	if (!err)
2950		err = copy_to_user_state_sec_ctx(x, skb);
2951	if (!err)
2952		err = copy_to_user_policy_type(xp->type, skb);
2953	if (!err)
2954		err = xfrm_mark_put(skb, &xp->mark);
2955	if (!err)
2956		err = xfrm_if_id_put(skb, xp->if_id);
2957	if (err) {
2958		nlmsg_cancel(skb, nlh);
2959		return err;
2960	}
2961
2962	nlmsg_end(skb, nlh);
2963	return 0;
2964}
2965
2966static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
2967			     struct xfrm_policy *xp)
2968{
2969	struct net *net = xs_net(x);
2970	struct sk_buff *skb;
2971	int err;
2972
2973	skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
2974	if (skb == NULL)
2975		return -ENOMEM;
2976
2977	err = build_acquire(skb, x, xt, xp);
2978	BUG_ON(err < 0);
2979
2980	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE);
2981}
2982
2983/* User gives us xfrm_user_policy_info followed by an array of 0
2984 * or more templates.
2985 */
2986static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
2987					       u8 *data, int len, int *dir)
2988{
2989	struct net *net = sock_net(sk);
2990	struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2991	struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2992	struct xfrm_policy *xp;
2993	int nr;
2994
2995	switch (sk->sk_family) {
2996	case AF_INET:
2997		if (opt != IP_XFRM_POLICY) {
2998			*dir = -EOPNOTSUPP;
2999			return NULL;
3000		}
3001		break;
3002#if IS_ENABLED(CONFIG_IPV6)
3003	case AF_INET6:
3004		if (opt != IPV6_XFRM_POLICY) {
3005			*dir = -EOPNOTSUPP;
3006			return NULL;
3007		}
3008		break;
3009#endif
3010	default:
3011		*dir = -EINVAL;
3012		return NULL;
3013	}
3014
3015	*dir = -EINVAL;
3016
3017	if (len < sizeof(*p) ||
3018	    verify_newpolicy_info(p))
3019		return NULL;
3020
3021	nr = ((len - sizeof(*p)) / sizeof(*ut));
3022	if (validate_tmpl(nr, ut, p->sel.family))
3023		return NULL;
3024
3025	if (p->dir > XFRM_POLICY_OUT)
3026		return NULL;
3027
3028	xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3029	if (xp == NULL) {
3030		*dir = -ENOBUFS;
3031		return NULL;
3032	}
3033
3034	copy_from_user_policy(xp, p);
3035	xp->type = XFRM_POLICY_TYPE_MAIN;
3036	copy_templates(xp, ut, nr);
3037
3038	*dir = p->dir;
3039
3040	return xp;
3041}
3042
3043static inline unsigned int xfrm_polexpire_msgsize(struct xfrm_policy *xp)
3044{
3045	return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
3046	       + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
3047	       + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
3048	       + nla_total_size(sizeof(struct xfrm_mark))
3049	       + userpolicy_type_attrsize();
3050}
3051
3052static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
3053			   int dir, const struct km_event *c)
3054{
3055	struct xfrm_user_polexpire *upe;
3056	int hard = c->data.hard;
3057	struct nlmsghdr *nlh;
3058	int err;
3059
3060	nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
3061	if (nlh == NULL)
3062		return -EMSGSIZE;
3063
3064	upe = nlmsg_data(nlh);
3065	copy_to_user_policy(xp, &upe->pol, dir);
3066	err = copy_to_user_tmpl(xp, skb);
3067	if (!err)
3068		err = copy_to_user_sec_ctx(xp, skb);
3069	if (!err)
3070		err = copy_to_user_policy_type(xp->type, skb);
3071	if (!err)
3072		err = xfrm_mark_put(skb, &xp->mark);
3073	if (!err)
3074		err = xfrm_if_id_put(skb, xp->if_id);
3075	if (err) {
3076		nlmsg_cancel(skb, nlh);
3077		return err;
3078	}
3079	upe->hard = !!hard;
3080
3081	nlmsg_end(skb, nlh);
3082	return 0;
3083}
3084
3085static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3086{
3087	struct net *net = xp_net(xp);
3088	struct sk_buff *skb;
3089	int err;
3090
3091	skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
3092	if (skb == NULL)
3093		return -ENOMEM;
3094
3095	err = build_polexpire(skb, xp, dir, c);
3096	BUG_ON(err < 0);
3097
3098	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
3099}
3100
3101static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
3102{
3103	unsigned int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
3104	struct net *net = xp_net(xp);
3105	struct xfrm_userpolicy_info *p;
3106	struct xfrm_userpolicy_id *id;
3107	struct nlmsghdr *nlh;
3108	struct sk_buff *skb;
3109	unsigned int headlen;
3110	int err;
3111
3112	headlen = sizeof(*p);
3113	if (c->event == XFRM_MSG_DELPOLICY) {
3114		len += nla_total_size(headlen);
3115		headlen = sizeof(*id);
3116	}
3117	len += userpolicy_type_attrsize();
3118	len += nla_total_size(sizeof(struct xfrm_mark));
3119	len += NLMSG_ALIGN(headlen);
3120
3121	skb = nlmsg_new(len, GFP_ATOMIC);
3122	if (skb == NULL)
3123		return -ENOMEM;
3124
3125	nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
3126	err = -EMSGSIZE;
3127	if (nlh == NULL)
3128		goto out_free_skb;
3129
3130	p = nlmsg_data(nlh);
3131	if (c->event == XFRM_MSG_DELPOLICY) {
3132		struct nlattr *attr;
3133
3134		id = nlmsg_data(nlh);
3135		memset(id, 0, sizeof(*id));
3136		id->dir = dir;
3137		if (c->data.byid)
3138			id->index = xp->index;
3139		else
3140			memcpy(&id->sel, &xp->selector, sizeof(id->sel));
3141
3142		attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
3143		err = -EMSGSIZE;
3144		if (attr == NULL)
3145			goto out_free_skb;
3146
3147		p = nla_data(attr);
3148	}
3149
3150	copy_to_user_policy(xp, p, dir);
3151	err = copy_to_user_tmpl(xp, skb);
3152	if (!err)
3153		err = copy_to_user_policy_type(xp->type, skb);
3154	if (!err)
3155		err = xfrm_mark_put(skb, &xp->mark);
3156	if (!err)
3157		err = xfrm_if_id_put(skb, xp->if_id);
3158	if (err)
3159		goto out_free_skb;
3160
3161	nlmsg_end(skb, nlh);
3162
3163	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
3164
3165out_free_skb:
3166	kfree_skb(skb);
3167	return err;
3168}
3169
3170static int xfrm_notify_policy_flush(const struct km_event *c)
3171{
3172	struct net *net = c->net;
3173	struct nlmsghdr *nlh;
3174	struct sk_buff *skb;
3175	int err;
3176
3177	skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
3178	if (skb == NULL)
3179		return -ENOMEM;
3180
3181	nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
3182	err = -EMSGSIZE;
3183	if (nlh == NULL)
3184		goto out_free_skb;
3185	err = copy_to_user_policy_type(c->data.type, skb);
3186	if (err)
3187		goto out_free_skb;
3188
3189	nlmsg_end(skb, nlh);
3190
3191	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
3192
3193out_free_skb:
3194	kfree_skb(skb);
3195	return err;
3196}
3197
3198static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3199{
3200
3201	switch (c->event) {
3202	case XFRM_MSG_NEWPOLICY:
3203	case XFRM_MSG_UPDPOLICY:
3204	case XFRM_MSG_DELPOLICY:
3205		return xfrm_notify_policy(xp, dir, c);
3206	case XFRM_MSG_FLUSHPOLICY:
3207		return xfrm_notify_policy_flush(c);
3208	case XFRM_MSG_POLEXPIRE:
3209		return xfrm_exp_policy_notify(xp, dir, c);
3210	default:
3211		printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
3212		       c->event);
3213	}
3214
3215	return 0;
3216
3217}
3218
3219static inline unsigned int xfrm_report_msgsize(void)
3220{
3221	return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
3222}
3223
3224static int build_report(struct sk_buff *skb, u8 proto,
3225			struct xfrm_selector *sel, xfrm_address_t *addr)
3226{
3227	struct xfrm_user_report *ur;
3228	struct nlmsghdr *nlh;
3229
3230	nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
3231	if (nlh == NULL)
3232		return -EMSGSIZE;
3233
3234	ur = nlmsg_data(nlh);
3235	ur->proto = proto;
3236	memcpy(&ur->sel, sel, sizeof(ur->sel));
3237
3238	if (addr) {
3239		int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr);
3240		if (err) {
3241			nlmsg_cancel(skb, nlh);
3242			return err;
3243		}
3244	}
3245	nlmsg_end(skb, nlh);
3246	return 0;
3247}
3248
3249static int xfrm_send_report(struct net *net, u8 proto,
3250			    struct xfrm_selector *sel, xfrm_address_t *addr)
3251{
3252	struct sk_buff *skb;
3253	int err;
3254
3255	skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
3256	if (skb == NULL)
3257		return -ENOMEM;
3258
3259	err = build_report(skb, proto, sel, addr);
3260	BUG_ON(err < 0);
3261
3262	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT);
3263}
3264
3265static inline unsigned int xfrm_mapping_msgsize(void)
3266{
3267	return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
3268}
3269
3270static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
3271			 xfrm_address_t *new_saddr, __be16 new_sport)
3272{
3273	struct xfrm_user_mapping *um;
3274	struct nlmsghdr *nlh;
3275
3276	nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
3277	if (nlh == NULL)
3278		return -EMSGSIZE;
3279
3280	um = nlmsg_data(nlh);
3281
3282	memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
3283	um->id.spi = x->id.spi;
3284	um->id.family = x->props.family;
3285	um->id.proto = x->id.proto;
3286	memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
3287	memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
3288	um->new_sport = new_sport;
3289	um->old_sport = x->encap->encap_sport;
3290	um->reqid = x->props.reqid;
3291
3292	nlmsg_end(skb, nlh);
3293	return 0;
3294}
3295
3296static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
3297			     __be16 sport)
3298{
3299	struct net *net = xs_net(x);
3300	struct sk_buff *skb;
3301	int err;
3302
3303	if (x->id.proto != IPPROTO_ESP)
3304		return -EINVAL;
3305
3306	if (!x->encap)
3307		return -EINVAL;
3308
3309	skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
3310	if (skb == NULL)
3311		return -ENOMEM;
3312
3313	err = build_mapping(skb, x, ipaddr, sport);
3314	BUG_ON(err < 0);
3315
3316	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING);
3317}
3318
3319static bool xfrm_is_alive(const struct km_event *c)
3320{
3321	return (bool)xfrm_acquire_is_on(c->net);
3322}
3323
3324static struct xfrm_mgr netlink_mgr = {
3325	.notify		= xfrm_send_state_notify,
3326	.acquire	= xfrm_send_acquire,
3327	.compile_policy	= xfrm_compile_policy,
3328	.notify_policy	= xfrm_send_policy_notify,
3329	.report		= xfrm_send_report,
3330	.migrate	= xfrm_send_migrate,
3331	.new_mapping	= xfrm_send_mapping,
3332	.is_alive	= xfrm_is_alive,
3333};
3334
3335static int __net_init xfrm_user_net_init(struct net *net)
3336{
3337	struct sock *nlsk;
3338	struct netlink_kernel_cfg cfg = {
3339		.groups	= XFRMNLGRP_MAX,
3340		.input	= xfrm_netlink_rcv,
3341	};
3342
3343	nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg);
3344	if (nlsk == NULL)
3345		return -ENOMEM;
3346	net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
3347	rcu_assign_pointer(net->xfrm.nlsk, nlsk);
3348	return 0;
3349}
3350
 
 
 
 
 
3351static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
3352{
3353	struct net *net;
3354	list_for_each_entry(net, net_exit_list, exit_list)
3355		RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
3356	synchronize_net();
3357	list_for_each_entry(net, net_exit_list, exit_list)
3358		netlink_kernel_release(net->xfrm.nlsk_stash);
3359}
3360
3361static struct pernet_operations xfrm_user_net_ops = {
3362	.init	    = xfrm_user_net_init,
 
3363	.exit_batch = xfrm_user_net_exit,
3364};
3365
3366static int __init xfrm_user_init(void)
3367{
3368	int rv;
3369
3370	printk(KERN_INFO "Initializing XFRM netlink socket\n");
3371
3372	rv = register_pernet_subsys(&xfrm_user_net_ops);
3373	if (rv < 0)
3374		return rv;
3375	rv = xfrm_register_km(&netlink_mgr);
3376	if (rv < 0)
3377		unregister_pernet_subsys(&xfrm_user_net_ops);
3378	return rv;
3379}
3380
3381static void __exit xfrm_user_exit(void)
3382{
3383	xfrm_unregister_km(&netlink_mgr);
3384	unregister_pernet_subsys(&xfrm_user_net_ops);
3385}
3386
3387module_init(xfrm_user_init);
3388module_exit(xfrm_user_exit);
3389MODULE_LICENSE("GPL");
3390MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);