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_ENCAP]) {
 584		x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
 585				   sizeof(*x->encap), GFP_KERNEL);
 586		if (x->encap == NULL)
 587			goto error;
 588	}
 589
 590	if (attrs[XFRMA_COADDR]) {
 591		x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
 592				    sizeof(*x->coaddr), GFP_KERNEL);
 593		if (x->coaddr == NULL)
 594			goto error;
 595	}
 596
 597	if (attrs[XFRMA_SA_EXTRA_FLAGS])
 598		x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]);
 599
 600	if ((err = attach_aead(x, attrs[XFRMA_ALG_AEAD])))
 601		goto error;
 602	if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
 603				     attrs[XFRMA_ALG_AUTH_TRUNC])))
 604		goto error;
 605	if (!x->props.aalgo) {
 606		if ((err = attach_auth(&x->aalg, &x->props.aalgo,
 607				       attrs[XFRMA_ALG_AUTH])))
 608			goto error;
 609	}
 610	if ((err = attach_crypt(x, attrs[XFRMA_ALG_CRYPT])))
 611		goto error;
 612	if ((err = attach_one_algo(&x->calg, &x->props.calgo,
 613				   xfrm_calg_get_byname,
 614				   attrs[XFRMA_ALG_COMP])))
 615		goto error;
 616
 
 
 
 
 
 
 
 617	if (attrs[XFRMA_TFCPAD])
 618		x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);
 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 bool xfrm_redact(void)
 852{
 853	return IS_ENABLED(CONFIG_SECURITY) &&
 854		security_locked_down(LOCKDOWN_XFRM_SECRET);
 855}
 856
 857static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
 858{
 859	struct xfrm_algo *algo;
 860	struct xfrm_algo_auth *ap;
 861	struct nlattr *nla;
 862	bool redact_secret = xfrm_redact();
 863
 864	nla = nla_reserve(skb, XFRMA_ALG_AUTH,
 865			  sizeof(*algo) + (auth->alg_key_len + 7) / 8);
 866	if (!nla)
 867		return -EMSGSIZE;
 
 868	algo = nla_data(nla);
 869	strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name));
 870
 871	if (redact_secret && auth->alg_key_len)
 872		memset(algo->alg_key, 0, (auth->alg_key_len + 7) / 8);
 873	else
 874		memcpy(algo->alg_key, auth->alg_key,
 875		       (auth->alg_key_len + 7) / 8);
 876	algo->alg_key_len = auth->alg_key_len;
 877
 878	nla = nla_reserve(skb, XFRMA_ALG_AUTH_TRUNC, xfrm_alg_auth_len(auth));
 879	if (!nla)
 880		return -EMSGSIZE;
 881	ap = nla_data(nla);
 882	memcpy(ap, auth, sizeof(struct xfrm_algo_auth));
 883	if (redact_secret && auth->alg_key_len)
 884		memset(ap->alg_key, 0, (auth->alg_key_len + 7) / 8);
 885	else
 886		memcpy(ap->alg_key, auth->alg_key,
 887		       (auth->alg_key_len + 7) / 8);
 888	return 0;
 889}
 890
 891static int copy_to_user_aead(struct xfrm_algo_aead *aead, struct sk_buff *skb)
 892{
 893	struct nlattr *nla = nla_reserve(skb, XFRMA_ALG_AEAD, aead_len(aead));
 894	struct xfrm_algo_aead *ap;
 895	bool redact_secret = xfrm_redact();
 896
 897	if (!nla)
 898		return -EMSGSIZE;
 899
 900	ap = nla_data(nla);
 901	memcpy(ap, aead, sizeof(*aead));
 902
 903	if (redact_secret && aead->alg_key_len)
 904		memset(ap->alg_key, 0, (aead->alg_key_len + 7) / 8);
 905	else
 906		memcpy(ap->alg_key, aead->alg_key,
 907		       (aead->alg_key_len + 7) / 8);
 908	return 0;
 909}
 910
 911static int copy_to_user_ealg(struct xfrm_algo *ealg, struct sk_buff *skb)
 912{
 913	struct xfrm_algo *ap;
 914	bool redact_secret = xfrm_redact();
 915	struct nlattr *nla = nla_reserve(skb, XFRMA_ALG_CRYPT,
 916					 xfrm_alg_len(ealg));
 917	if (!nla)
 918		return -EMSGSIZE;
 919
 920	ap = nla_data(nla);
 921	memcpy(ap, ealg, sizeof(*ealg));
 922
 923	if (redact_secret && ealg->alg_key_len)
 924		memset(ap->alg_key, 0, (ealg->alg_key_len + 7) / 8);
 925	else
 926		memcpy(ap->alg_key, ealg->alg_key,
 927		       (ealg->alg_key_len + 7) / 8);
 928
 929	return 0;
 930}
 931
 932static int xfrm_smark_put(struct sk_buff *skb, struct xfrm_mark *m)
 933{
 934	int ret = 0;
 935
 936	if (m->v | m->m) {
 937		ret = nla_put_u32(skb, XFRMA_SET_MARK, m->v);
 938		if (!ret)
 939			ret = nla_put_u32(skb, XFRMA_SET_MARK_MASK, m->m);
 940	}
 941	return ret;
 942}
 943
 944/* Don't change this without updating xfrm_sa_len! */
 945static int copy_to_user_state_extra(struct xfrm_state *x,
 946				    struct xfrm_usersa_info *p,
 947				    struct sk_buff *skb)
 948{
 949	int ret = 0;
 950
 951	copy_to_user_state(x, p);
 952
 953	if (x->props.extra_flags) {
 954		ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS,
 955				  x->props.extra_flags);
 956		if (ret)
 957			goto out;
 958	}
 959
 960	if (x->coaddr) {
 961		ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
 962		if (ret)
 963			goto out;
 964	}
 965	if (x->lastused) {
 966		ret = nla_put_u64_64bit(skb, XFRMA_LASTUSED, x->lastused,
 967					XFRMA_PAD);
 968		if (ret)
 969			goto out;
 970	}
 971	if (x->aead) {
 972		ret = copy_to_user_aead(x->aead, skb);
 973		if (ret)
 974			goto out;
 975	}
 976	if (x->aalg) {
 977		ret = copy_to_user_auth(x->aalg, skb);
 
 
 
 978		if (ret)
 979			goto out;
 980	}
 981	if (x->ealg) {
 982		ret = copy_to_user_ealg(x->ealg, skb);
 983		if (ret)
 984			goto out;
 985	}
 986	if (x->calg) {
 987		ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
 988		if (ret)
 989			goto out;
 990	}
 991	if (x->encap) {
 992		ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
 993		if (ret)
 994			goto out;
 995	}
 996	if (x->tfcpad) {
 997		ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad);
 998		if (ret)
 999			goto out;
1000	}
1001	ret = xfrm_mark_put(skb, &x->mark);
1002	if (ret)
1003		goto out;
1004
1005	ret = xfrm_smark_put(skb, &x->props.smark);
1006	if (ret)
1007		goto out;
1008
1009	if (x->replay_esn)
1010		ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
1011			      xfrm_replay_state_esn_len(x->replay_esn),
1012			      x->replay_esn);
1013	else
1014		ret = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
1015			      &x->replay);
1016	if (ret)
1017		goto out;
1018	if(x->xso.dev)
1019		ret = copy_user_offload(&x->xso, skb);
1020	if (ret)
1021		goto out;
1022	if (x->if_id) {
1023		ret = nla_put_u32(skb, XFRMA_IF_ID, x->if_id);
1024		if (ret)
1025			goto out;
1026	}
1027	if (x->security)
1028		ret = copy_sec_ctx(x->security, skb);
1029out:
1030	return ret;
1031}
1032
1033static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
1034{
1035	struct xfrm_dump_info *sp = ptr;
1036	struct sk_buff *in_skb = sp->in_skb;
1037	struct sk_buff *skb = sp->out_skb;
1038	struct xfrm_translator *xtr;
1039	struct xfrm_usersa_info *p;
1040	struct nlmsghdr *nlh;
1041	int err;
1042
1043	nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
1044			XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
1045	if (nlh == NULL)
1046		return -EMSGSIZE;
1047
1048	p = nlmsg_data(nlh);
1049
1050	err = copy_to_user_state_extra(x, p, skb);
1051	if (err) {
1052		nlmsg_cancel(skb, nlh);
1053		return err;
1054	}
1055	nlmsg_end(skb, nlh);
1056
1057	xtr = xfrm_get_translator();
1058	if (xtr) {
1059		err = xtr->alloc_compat(skb, nlh);
1060
1061		xfrm_put_translator(xtr);
1062		if (err) {
1063			nlmsg_cancel(skb, nlh);
1064			return err;
1065		}
1066	}
1067
1068	return 0;
1069}
1070
1071static int xfrm_dump_sa_done(struct netlink_callback *cb)
1072{
1073	struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
1074	struct sock *sk = cb->skb->sk;
1075	struct net *net = sock_net(sk);
1076
1077	if (cb->args[0])
1078		xfrm_state_walk_done(walk, net);
1079	return 0;
1080}
1081
 
1082static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
1083{
1084	struct net *net = sock_net(skb->sk);
1085	struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
1086	struct xfrm_dump_info info;
1087
1088	BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
1089		     sizeof(cb->args) - sizeof(cb->args[0]));
1090
1091	info.in_skb = cb->skb;
1092	info.out_skb = skb;
1093	info.nlmsg_seq = cb->nlh->nlmsg_seq;
1094	info.nlmsg_flags = NLM_F_MULTI;
1095
1096	if (!cb->args[0]) {
1097		struct nlattr *attrs[XFRMA_MAX+1];
1098		struct xfrm_address_filter *filter = NULL;
1099		u8 proto = 0;
1100		int err;
1101
1102		err = nlmsg_parse_deprecated(cb->nlh, 0, attrs, XFRMA_MAX,
1103					     xfrma_policy, cb->extack);
1104		if (err < 0)
1105			return err;
1106
1107		if (attrs[XFRMA_ADDRESS_FILTER]) {
1108			filter = kmemdup(nla_data(attrs[XFRMA_ADDRESS_FILTER]),
1109					 sizeof(*filter), GFP_KERNEL);
1110			if (filter == NULL)
1111				return -ENOMEM;
1112		}
1113
1114		if (attrs[XFRMA_PROTO])
1115			proto = nla_get_u8(attrs[XFRMA_PROTO]);
1116
1117		xfrm_state_walk_init(walk, proto, filter);
1118		cb->args[0] = 1;
1119	}
1120
1121	(void) xfrm_state_walk(net, walk, dump_one_state, &info);
1122
1123	return skb->len;
1124}
1125
1126static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
1127					  struct xfrm_state *x, u32 seq)
1128{
1129	struct xfrm_dump_info info;
1130	struct sk_buff *skb;
1131	int err;
1132
1133	skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1134	if (!skb)
1135		return ERR_PTR(-ENOMEM);
1136
1137	info.in_skb = in_skb;
1138	info.out_skb = skb;
1139	info.nlmsg_seq = seq;
1140	info.nlmsg_flags = 0;
1141
1142	err = dump_one_state(x, 0, &info);
1143	if (err) {
1144		kfree_skb(skb);
1145		return ERR_PTR(err);
1146	}
1147
1148	return skb;
1149}
1150
1151/* A wrapper for nlmsg_multicast() checking that nlsk is still available.
1152 * Must be called with RCU read lock.
1153 */
1154static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb,
1155				       u32 pid, unsigned int group)
1156{
1157	struct sock *nlsk = rcu_dereference(net->xfrm.nlsk);
1158	struct xfrm_translator *xtr;
1159
1160	if (!nlsk) {
1161		kfree_skb(skb);
1162		return -EPIPE;
1163	}
1164
1165	xtr = xfrm_get_translator();
1166	if (xtr) {
1167		int err = xtr->alloc_compat(skb, nlmsg_hdr(skb));
1168
1169		xfrm_put_translator(xtr);
1170		if (err) {
1171			kfree_skb(skb);
1172			return err;
1173		}
1174	}
1175
1176	return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC);
 
 
 
1177}
1178
1179static inline unsigned int xfrm_spdinfo_msgsize(void)
1180{
1181	return NLMSG_ALIGN(4)
1182	       + nla_total_size(sizeof(struct xfrmu_spdinfo))
1183	       + nla_total_size(sizeof(struct xfrmu_spdhinfo))
1184	       + nla_total_size(sizeof(struct xfrmu_spdhthresh))
1185	       + nla_total_size(sizeof(struct xfrmu_spdhthresh));
1186}
1187
1188static int build_spdinfo(struct sk_buff *skb, struct net *net,
1189			 u32 portid, u32 seq, u32 flags)
1190{
1191	struct xfrmk_spdinfo si;
1192	struct xfrmu_spdinfo spc;
1193	struct xfrmu_spdhinfo sph;
1194	struct xfrmu_spdhthresh spt4, spt6;
1195	struct nlmsghdr *nlh;
1196	int err;
1197	u32 *f;
1198	unsigned lseq;
1199
1200	nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
1201	if (nlh == NULL) /* shouldn't really happen ... */
1202		return -EMSGSIZE;
1203
1204	f = nlmsg_data(nlh);
1205	*f = flags;
1206	xfrm_spd_getinfo(net, &si);
1207	spc.incnt = si.incnt;
1208	spc.outcnt = si.outcnt;
1209	spc.fwdcnt = si.fwdcnt;
1210	spc.inscnt = si.inscnt;
1211	spc.outscnt = si.outscnt;
1212	spc.fwdscnt = si.fwdscnt;
1213	sph.spdhcnt = si.spdhcnt;
1214	sph.spdhmcnt = si.spdhmcnt;
1215
1216	do {
1217		lseq = read_seqbegin(&net->xfrm.policy_hthresh.lock);
1218
1219		spt4.lbits = net->xfrm.policy_hthresh.lbits4;
1220		spt4.rbits = net->xfrm.policy_hthresh.rbits4;
1221		spt6.lbits = net->xfrm.policy_hthresh.lbits6;
1222		spt6.rbits = net->xfrm.policy_hthresh.rbits6;
1223	} while (read_seqretry(&net->xfrm.policy_hthresh.lock, lseq));
1224
1225	err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
1226	if (!err)
1227		err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
1228	if (!err)
1229		err = nla_put(skb, XFRMA_SPD_IPV4_HTHRESH, sizeof(spt4), &spt4);
1230	if (!err)
1231		err = nla_put(skb, XFRMA_SPD_IPV6_HTHRESH, sizeof(spt6), &spt6);
1232	if (err) {
1233		nlmsg_cancel(skb, nlh);
1234		return err;
1235	}
1236
1237	nlmsg_end(skb, nlh);
1238	return 0;
1239}
1240
1241static int xfrm_set_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1242			    struct nlattr **attrs)
1243{
1244	struct net *net = sock_net(skb->sk);
1245	struct xfrmu_spdhthresh *thresh4 = NULL;
1246	struct xfrmu_spdhthresh *thresh6 = NULL;
1247
1248	/* selector prefixlen thresholds to hash policies */
1249	if (attrs[XFRMA_SPD_IPV4_HTHRESH]) {
1250		struct nlattr *rta = attrs[XFRMA_SPD_IPV4_HTHRESH];
1251
1252		if (nla_len(rta) < sizeof(*thresh4))
1253			return -EINVAL;
1254		thresh4 = nla_data(rta);
1255		if (thresh4->lbits > 32 || thresh4->rbits > 32)
1256			return -EINVAL;
1257	}
1258	if (attrs[XFRMA_SPD_IPV6_HTHRESH]) {
1259		struct nlattr *rta = attrs[XFRMA_SPD_IPV6_HTHRESH];
1260
1261		if (nla_len(rta) < sizeof(*thresh6))
1262			return -EINVAL;
1263		thresh6 = nla_data(rta);
1264		if (thresh6->lbits > 128 || thresh6->rbits > 128)
1265			return -EINVAL;
1266	}
1267
1268	if (thresh4 || thresh6) {
1269		write_seqlock(&net->xfrm.policy_hthresh.lock);
1270		if (thresh4) {
1271			net->xfrm.policy_hthresh.lbits4 = thresh4->lbits;
1272			net->xfrm.policy_hthresh.rbits4 = thresh4->rbits;
1273		}
1274		if (thresh6) {
1275			net->xfrm.policy_hthresh.lbits6 = thresh6->lbits;
1276			net->xfrm.policy_hthresh.rbits6 = thresh6->rbits;
1277		}
1278		write_sequnlock(&net->xfrm.policy_hthresh.lock);
1279
1280		xfrm_policy_hash_rebuild(net);
1281	}
1282
1283	return 0;
1284}
1285
1286static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1287		struct nlattr **attrs)
1288{
1289	struct net *net = sock_net(skb->sk);
1290	struct sk_buff *r_skb;
1291	u32 *flags = nlmsg_data(nlh);
1292	u32 sportid = NETLINK_CB(skb).portid;
1293	u32 seq = nlh->nlmsg_seq;
1294	int err;
1295
1296	r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
1297	if (r_skb == NULL)
1298		return -ENOMEM;
1299
1300	err = build_spdinfo(r_skb, net, sportid, seq, *flags);
1301	BUG_ON(err < 0);
1302
1303	return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1304}
1305
1306static inline unsigned int xfrm_sadinfo_msgsize(void)
1307{
1308	return NLMSG_ALIGN(4)
1309	       + nla_total_size(sizeof(struct xfrmu_sadhinfo))
1310	       + nla_total_size(4); /* XFRMA_SAD_CNT */
1311}
1312
1313static int build_sadinfo(struct sk_buff *skb, struct net *net,
1314			 u32 portid, u32 seq, u32 flags)
1315{
1316	struct xfrmk_sadinfo si;
1317	struct xfrmu_sadhinfo sh;
1318	struct nlmsghdr *nlh;
1319	int err;
1320	u32 *f;
1321
1322	nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
1323	if (nlh == NULL) /* shouldn't really happen ... */
1324		return -EMSGSIZE;
1325
1326	f = nlmsg_data(nlh);
1327	*f = flags;
1328	xfrm_sad_getinfo(net, &si);
1329
1330	sh.sadhmcnt = si.sadhmcnt;
1331	sh.sadhcnt = si.sadhcnt;
1332
1333	err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt);
1334	if (!err)
1335		err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
1336	if (err) {
1337		nlmsg_cancel(skb, nlh);
1338		return err;
1339	}
1340
1341	nlmsg_end(skb, nlh);
1342	return 0;
1343}
1344
1345static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1346		struct nlattr **attrs)
1347{
1348	struct net *net = sock_net(skb->sk);
1349	struct sk_buff *r_skb;
1350	u32 *flags = nlmsg_data(nlh);
1351	u32 sportid = NETLINK_CB(skb).portid;
1352	u32 seq = nlh->nlmsg_seq;
1353	int err;
1354
1355	r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
1356	if (r_skb == NULL)
1357		return -ENOMEM;
1358
1359	err = build_sadinfo(r_skb, net, sportid, seq, *flags);
1360	BUG_ON(err < 0);
1361
1362	return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1363}
1364
1365static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1366		struct nlattr **attrs)
1367{
1368	struct net *net = sock_net(skb->sk);
1369	struct xfrm_usersa_id *p = nlmsg_data(nlh);
1370	struct xfrm_state *x;
1371	struct sk_buff *resp_skb;
1372	int err = -ESRCH;
1373
1374	x = xfrm_user_state_lookup(net, p, attrs, &err);
1375	if (x == NULL)
1376		goto out_noput;
1377
1378	resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1379	if (IS_ERR(resp_skb)) {
1380		err = PTR_ERR(resp_skb);
1381	} else {
1382		err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1383	}
1384	xfrm_state_put(x);
1385out_noput:
1386	return err;
1387}
1388
1389static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
1390		struct nlattr **attrs)
1391{
1392	struct net *net = sock_net(skb->sk);
1393	struct xfrm_state *x;
1394	struct xfrm_userspi_info *p;
1395	struct xfrm_translator *xtr;
1396	struct sk_buff *resp_skb;
1397	xfrm_address_t *daddr;
1398	int family;
1399	int err;
1400	u32 mark;
1401	struct xfrm_mark m;
1402	u32 if_id = 0;
1403
1404	p = nlmsg_data(nlh);
1405	err = verify_spi_info(p->info.id.proto, p->min, p->max);
1406	if (err)
1407		goto out_noput;
1408
1409	family = p->info.family;
1410	daddr = &p->info.id.daddr;
1411
1412	x = NULL;
1413
1414	mark = xfrm_mark_get(attrs, &m);
1415
1416	if (attrs[XFRMA_IF_ID])
1417		if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
1418
1419	if (p->info.seq) {
1420		x = xfrm_find_acq_byseq(net, mark, p->info.seq);
1421		if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) {
1422			xfrm_state_put(x);
1423			x = NULL;
1424		}
1425	}
1426
1427	if (!x)
1428		x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1429				  if_id, p->info.id.proto, daddr,
1430				  &p->info.saddr, 1,
1431				  family);
1432	err = -ENOENT;
1433	if (x == NULL)
1434		goto out_noput;
1435
1436	err = xfrm_alloc_spi(x, p->min, p->max);
1437	if (err)
1438		goto out;
1439
1440	resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1441	if (IS_ERR(resp_skb)) {
1442		err = PTR_ERR(resp_skb);
1443		goto out;
1444	}
1445
1446	xtr = xfrm_get_translator();
1447	if (xtr) {
1448		err = xtr->alloc_compat(skb, nlmsg_hdr(skb));
1449
1450		xfrm_put_translator(xtr);
1451		if (err) {
1452			kfree_skb(resp_skb);
1453			goto out;
1454		}
1455	}
1456
1457	err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1458
1459out:
1460	xfrm_state_put(x);
1461out_noput:
1462	return err;
1463}
1464
1465static int verify_policy_dir(u8 dir)
1466{
1467	switch (dir) {
1468	case XFRM_POLICY_IN:
1469	case XFRM_POLICY_OUT:
1470	case XFRM_POLICY_FWD:
1471		break;
1472
1473	default:
1474		return -EINVAL;
1475	}
1476
1477	return 0;
1478}
1479
1480static int verify_policy_type(u8 type)
1481{
1482	switch (type) {
1483	case XFRM_POLICY_TYPE_MAIN:
1484#ifdef CONFIG_XFRM_SUB_POLICY
1485	case XFRM_POLICY_TYPE_SUB:
1486#endif
1487		break;
1488
1489	default:
1490		return -EINVAL;
1491	}
1492
1493	return 0;
1494}
1495
1496static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
1497{
1498	int ret;
1499
1500	switch (p->share) {
1501	case XFRM_SHARE_ANY:
1502	case XFRM_SHARE_SESSION:
1503	case XFRM_SHARE_USER:
1504	case XFRM_SHARE_UNIQUE:
1505		break;
1506
1507	default:
1508		return -EINVAL;
1509	}
1510
1511	switch (p->action) {
1512	case XFRM_POLICY_ALLOW:
1513	case XFRM_POLICY_BLOCK:
1514		break;
1515
1516	default:
1517		return -EINVAL;
1518	}
1519
1520	switch (p->sel.family) {
1521	case AF_INET:
1522		if (p->sel.prefixlen_d > 32 || p->sel.prefixlen_s > 32)
1523			return -EINVAL;
1524
1525		break;
1526
1527	case AF_INET6:
1528#if IS_ENABLED(CONFIG_IPV6)
1529		if (p->sel.prefixlen_d > 128 || p->sel.prefixlen_s > 128)
1530			return -EINVAL;
1531
1532		break;
1533#else
1534		return  -EAFNOSUPPORT;
1535#endif
1536
1537	default:
1538		return -EINVAL;
1539	}
1540
1541	ret = verify_policy_dir(p->dir);
1542	if (ret)
1543		return ret;
1544	if (p->index && (xfrm_policy_id2dir(p->index) != p->dir))
1545		return -EINVAL;
1546
1547	return 0;
1548}
1549
1550static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
1551{
1552	struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1553	struct xfrm_user_sec_ctx *uctx;
1554
1555	if (!rt)
1556		return 0;
1557
1558	uctx = nla_data(rt);
1559	return security_xfrm_policy_alloc(&pol->security, uctx, GFP_KERNEL);
1560}
1561
1562static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1563			   int nr)
1564{
1565	int i;
1566
1567	xp->xfrm_nr = nr;
1568	for (i = 0; i < nr; i++, ut++) {
1569		struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1570
1571		memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1572		memcpy(&t->saddr, &ut->saddr,
1573		       sizeof(xfrm_address_t));
1574		t->reqid = ut->reqid;
1575		t->mode = ut->mode;
1576		t->share = ut->share;
1577		t->optional = ut->optional;
1578		t->aalgos = ut->aalgos;
1579		t->ealgos = ut->ealgos;
1580		t->calgos = ut->calgos;
1581		/* If all masks are ~0, then we allow all algorithms. */
1582		t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
1583		t->encap_family = ut->family;
1584	}
1585}
1586
1587static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
1588{
1589	u16 prev_family;
1590	int i;
1591
1592	if (nr > XFRM_MAX_DEPTH)
1593		return -EINVAL;
1594
1595	prev_family = family;
1596
1597	for (i = 0; i < nr; i++) {
1598		/* We never validated the ut->family value, so many
1599		 * applications simply leave it at zero.  The check was
1600		 * never made and ut->family was ignored because all
1601		 * templates could be assumed to have the same family as
1602		 * the policy itself.  Now that we will have ipv4-in-ipv6
1603		 * and ipv6-in-ipv4 tunnels, this is no longer true.
1604		 */
1605		if (!ut[i].family)
1606			ut[i].family = family;
1607
1608		switch (ut[i].mode) {
1609		case XFRM_MODE_TUNNEL:
1610		case XFRM_MODE_BEET:
1611			break;
1612		default:
1613			if (ut[i].family != prev_family)
1614				return -EINVAL;
1615			break;
1616		}
1617		if (ut[i].mode >= XFRM_MODE_MAX)
1618			return -EINVAL;
1619
1620		prev_family = ut[i].family;
1621
1622		switch (ut[i].family) {
1623		case AF_INET:
1624			break;
1625#if IS_ENABLED(CONFIG_IPV6)
1626		case AF_INET6:
1627			break;
1628#endif
1629		default:
1630			return -EINVAL;
1631		}
1632
1633		if (!xfrm_id_proto_valid(ut[i].id.proto))
 
 
 
 
 
 
 
 
 
 
1634			return -EINVAL;
 
 
1635	}
1636
1637	return 0;
1638}
1639
1640static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1641{
1642	struct nlattr *rt = attrs[XFRMA_TMPL];
1643
1644	if (!rt) {
1645		pol->xfrm_nr = 0;
1646	} else {
1647		struct xfrm_user_tmpl *utmpl = nla_data(rt);
1648		int nr = nla_len(rt) / sizeof(*utmpl);
1649		int err;
1650
1651		err = validate_tmpl(nr, utmpl, pol->family);
1652		if (err)
1653			return err;
1654
1655		copy_templates(pol, utmpl, nr);
1656	}
1657	return 0;
1658}
1659
1660static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
1661{
1662	struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
1663	struct xfrm_userpolicy_type *upt;
1664	u8 type = XFRM_POLICY_TYPE_MAIN;
1665	int err;
1666
1667	if (rt) {
1668		upt = nla_data(rt);
1669		type = upt->type;
1670	}
1671
1672	err = verify_policy_type(type);
1673	if (err)
1674		return err;
1675
1676	*tp = type;
1677	return 0;
1678}
1679
1680static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1681{
1682	xp->priority = p->priority;
1683	xp->index = p->index;
1684	memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1685	memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1686	xp->action = p->action;
1687	xp->flags = p->flags;
1688	xp->family = p->sel.family;
1689	/* XXX xp->share = p->share; */
1690}
1691
1692static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1693{
1694	memset(p, 0, sizeof(*p));
1695	memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1696	memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1697	memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1698	p->priority = xp->priority;
1699	p->index = xp->index;
1700	p->sel.family = xp->family;
1701	p->dir = dir;
1702	p->action = xp->action;
1703	p->flags = xp->flags;
1704	p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1705}
1706
1707static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1708{
1709	struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
1710	int err;
1711
1712	if (!xp) {
1713		*errp = -ENOMEM;
1714		return NULL;
1715	}
1716
1717	copy_from_user_policy(xp, p);
1718
1719	err = copy_from_user_policy_type(&xp->type, attrs);
1720	if (err)
1721		goto error;
1722
1723	if (!(err = copy_from_user_tmpl(xp, attrs)))
1724		err = copy_from_user_sec_ctx(xp, attrs);
1725	if (err)
1726		goto error;
1727
1728	xfrm_mark_get(attrs, &xp->mark);
1729
1730	if (attrs[XFRMA_IF_ID])
1731		xp->if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
1732
1733	return xp;
1734 error:
1735	*errp = err;
1736	xp->walk.dead = 1;
1737	xfrm_policy_destroy(xp);
1738	return NULL;
1739}
1740
1741static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1742		struct nlattr **attrs)
1743{
1744	struct net *net = sock_net(skb->sk);
1745	struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1746	struct xfrm_policy *xp;
1747	struct km_event c;
1748	int err;
1749	int excl;
1750
1751	err = verify_newpolicy_info(p);
1752	if (err)
1753		return err;
1754	err = verify_sec_ctx_len(attrs);
1755	if (err)
1756		return err;
1757
1758	xp = xfrm_policy_construct(net, p, attrs, &err);
1759	if (!xp)
1760		return err;
1761
1762	/* shouldn't excl be based on nlh flags??
1763	 * Aha! this is anti-netlink really i.e  more pfkey derived
1764	 * in netlink excl is a flag and you wouldn't need
1765	 * a type XFRM_MSG_UPDPOLICY - JHS */
1766	excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1767	err = xfrm_policy_insert(p->dir, xp, excl);
1768	xfrm_audit_policy_add(xp, err ? 0 : 1, true);
1769
1770	if (err) {
1771		security_xfrm_policy_free(xp->security);
1772		kfree(xp);
1773		return err;
1774	}
1775
1776	c.event = nlh->nlmsg_type;
1777	c.seq = nlh->nlmsg_seq;
1778	c.portid = nlh->nlmsg_pid;
1779	km_policy_notify(xp, p->dir, &c);
1780
1781	xfrm_pol_put(xp);
1782
1783	return 0;
1784}
1785
1786static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1787{
1788	struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1789	int i;
1790
1791	if (xp->xfrm_nr == 0)
1792		return 0;
1793
1794	for (i = 0; i < xp->xfrm_nr; i++) {
1795		struct xfrm_user_tmpl *up = &vec[i];
1796		struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1797
1798		memset(up, 0, sizeof(*up));
1799		memcpy(&up->id, &kp->id, sizeof(up->id));
1800		up->family = kp->encap_family;
1801		memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1802		up->reqid = kp->reqid;
1803		up->mode = kp->mode;
1804		up->share = kp->share;
1805		up->optional = kp->optional;
1806		up->aalgos = kp->aalgos;
1807		up->ealgos = kp->ealgos;
1808		up->calgos = kp->calgos;
1809	}
1810
1811	return nla_put(skb, XFRMA_TMPL,
1812		       sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
1813}
1814
1815static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1816{
1817	if (x->security) {
1818		return copy_sec_ctx(x->security, skb);
1819	}
1820	return 0;
1821}
1822
1823static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1824{
1825	if (xp->security)
1826		return copy_sec_ctx(xp->security, skb);
1827	return 0;
1828}
1829static inline unsigned int userpolicy_type_attrsize(void)
1830{
1831#ifdef CONFIG_XFRM_SUB_POLICY
1832	return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1833#else
1834	return 0;
1835#endif
1836}
1837
1838#ifdef CONFIG_XFRM_SUB_POLICY
1839static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1840{
1841	struct xfrm_userpolicy_type upt;
1842
1843	/* Sadly there are two holes in struct xfrm_userpolicy_type */
1844	memset(&upt, 0, sizeof(upt));
1845	upt.type = type;
1846
1847	return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1848}
1849
1850#else
1851static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1852{
1853	return 0;
1854}
1855#endif
1856
1857static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1858{
1859	struct xfrm_dump_info *sp = ptr;
1860	struct xfrm_userpolicy_info *p;
1861	struct sk_buff *in_skb = sp->in_skb;
1862	struct sk_buff *skb = sp->out_skb;
1863	struct xfrm_translator *xtr;
1864	struct nlmsghdr *nlh;
1865	int err;
1866
1867	nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
1868			XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1869	if (nlh == NULL)
1870		return -EMSGSIZE;
1871
1872	p = nlmsg_data(nlh);
1873	copy_to_user_policy(xp, p, dir);
1874	err = copy_to_user_tmpl(xp, skb);
1875	if (!err)
1876		err = copy_to_user_sec_ctx(xp, skb);
1877	if (!err)
1878		err = copy_to_user_policy_type(xp->type, skb);
1879	if (!err)
1880		err = xfrm_mark_put(skb, &xp->mark);
1881	if (!err)
1882		err = xfrm_if_id_put(skb, xp->if_id);
1883	if (err) {
1884		nlmsg_cancel(skb, nlh);
1885		return err;
1886	}
1887	nlmsg_end(skb, nlh);
1888
1889	xtr = xfrm_get_translator();
1890	if (xtr) {
1891		err = xtr->alloc_compat(skb, nlh);
1892
1893		xfrm_put_translator(xtr);
1894		if (err) {
1895			nlmsg_cancel(skb, nlh);
1896			return err;
1897		}
1898	}
1899
1900	return 0;
1901}
1902
1903static int xfrm_dump_policy_done(struct netlink_callback *cb)
1904{
1905	struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1906	struct net *net = sock_net(cb->skb->sk);
1907
1908	xfrm_policy_walk_done(walk, net);
1909	return 0;
1910}
1911
1912static int xfrm_dump_policy_start(struct netlink_callback *cb)
1913{
1914	struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1915
1916	BUILD_BUG_ON(sizeof(*walk) > sizeof(cb->args));
1917
1918	xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1919	return 0;
1920}
1921
1922static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1923{
1924	struct net *net = sock_net(skb->sk);
1925	struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1926	struct xfrm_dump_info info;
1927
1928	info.in_skb = cb->skb;
1929	info.out_skb = skb;
1930	info.nlmsg_seq = cb->nlh->nlmsg_seq;
1931	info.nlmsg_flags = NLM_F_MULTI;
1932
1933	(void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
1934
1935	return skb->len;
1936}
1937
1938static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1939					  struct xfrm_policy *xp,
1940					  int dir, u32 seq)
1941{
1942	struct xfrm_dump_info info;
1943	struct sk_buff *skb;
1944	int err;
1945
1946	skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1947	if (!skb)
1948		return ERR_PTR(-ENOMEM);
1949
1950	info.in_skb = in_skb;
1951	info.out_skb = skb;
1952	info.nlmsg_seq = seq;
1953	info.nlmsg_flags = 0;
1954
1955	err = dump_one_policy(xp, dir, 0, &info);
1956	if (err) {
1957		kfree_skb(skb);
1958		return ERR_PTR(err);
1959	}
1960
1961	return skb;
1962}
1963
1964static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1965		struct nlattr **attrs)
1966{
1967	struct net *net = sock_net(skb->sk);
1968	struct xfrm_policy *xp;
1969	struct xfrm_userpolicy_id *p;
1970	u8 type = XFRM_POLICY_TYPE_MAIN;
1971	int err;
1972	struct km_event c;
1973	int delete;
1974	struct xfrm_mark m;
1975	u32 if_id = 0;
1976
1977	p = nlmsg_data(nlh);
1978	delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1979
1980	err = copy_from_user_policy_type(&type, attrs);
1981	if (err)
1982		return err;
1983
1984	err = verify_policy_dir(p->dir);
1985	if (err)
1986		return err;
1987
1988	if (attrs[XFRMA_IF_ID])
1989		if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
1990
1991	xfrm_mark_get(attrs, &m);
1992
1993	if (p->index)
1994		xp = xfrm_policy_byid(net, &m, if_id, type, p->dir,
1995				      p->index, delete, &err);
1996	else {
1997		struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1998		struct xfrm_sec_ctx *ctx;
1999
2000		err = verify_sec_ctx_len(attrs);
2001		if (err)
2002			return err;
2003
2004		ctx = NULL;
2005		if (rt) {
2006			struct xfrm_user_sec_ctx *uctx = nla_data(rt);
2007
2008			err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
2009			if (err)
2010				return err;
2011		}
2012		xp = xfrm_policy_bysel_ctx(net, &m, if_id, type, p->dir,
2013					   &p->sel, ctx, delete, &err);
2014		security_xfrm_policy_free(ctx);
2015	}
2016	if (xp == NULL)
2017		return -ENOENT;
2018
2019	if (!delete) {
2020		struct sk_buff *resp_skb;
2021
2022		resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
2023		if (IS_ERR(resp_skb)) {
2024			err = PTR_ERR(resp_skb);
2025		} else {
2026			err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
2027					    NETLINK_CB(skb).portid);
2028		}
2029	} else {
2030		xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2031
2032		if (err != 0)
2033			goto out;
2034
2035		c.data.byid = p->index;
2036		c.event = nlh->nlmsg_type;
2037		c.seq = nlh->nlmsg_seq;
2038		c.portid = nlh->nlmsg_pid;
2039		km_policy_notify(xp, p->dir, &c);
2040	}
2041
2042out:
2043	xfrm_pol_put(xp);
2044	return err;
2045}
2046
2047static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
2048		struct nlattr **attrs)
2049{
2050	struct net *net = sock_net(skb->sk);
2051	struct km_event c;
2052	struct xfrm_usersa_flush *p = nlmsg_data(nlh);
2053	int err;
2054
2055	err = xfrm_state_flush(net, p->proto, true, false);
2056	if (err) {
2057		if (err == -ESRCH) /* empty table */
2058			return 0;
2059		return err;
2060	}
2061	c.data.proto = p->proto;
2062	c.event = nlh->nlmsg_type;
2063	c.seq = nlh->nlmsg_seq;
2064	c.portid = nlh->nlmsg_pid;
2065	c.net = net;
2066	km_state_notify(NULL, &c);
2067
2068	return 0;
2069}
2070
2071static inline unsigned int xfrm_aevent_msgsize(struct xfrm_state *x)
2072{
2073	unsigned int replay_size = x->replay_esn ?
2074			      xfrm_replay_state_esn_len(x->replay_esn) :
2075			      sizeof(struct xfrm_replay_state);
2076
2077	return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
2078	       + nla_total_size(replay_size)
2079	       + nla_total_size_64bit(sizeof(struct xfrm_lifetime_cur))
2080	       + nla_total_size(sizeof(struct xfrm_mark))
2081	       + nla_total_size(4) /* XFRM_AE_RTHR */
2082	       + nla_total_size(4); /* XFRM_AE_ETHR */
2083}
2084
2085static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
2086{
2087	struct xfrm_aevent_id *id;
2088	struct nlmsghdr *nlh;
2089	int err;
2090
2091	nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
2092	if (nlh == NULL)
2093		return -EMSGSIZE;
2094
2095	id = nlmsg_data(nlh);
2096	memset(&id->sa_id, 0, sizeof(id->sa_id));
2097	memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr));
2098	id->sa_id.spi = x->id.spi;
2099	id->sa_id.family = x->props.family;
2100	id->sa_id.proto = x->id.proto;
2101	memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr));
2102	id->reqid = x->props.reqid;
2103	id->flags = c->data.aevent;
2104
2105	if (x->replay_esn) {
2106		err = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
2107			      xfrm_replay_state_esn_len(x->replay_esn),
2108			      x->replay_esn);
2109	} else {
2110		err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
2111			      &x->replay);
2112	}
2113	if (err)
2114		goto out_cancel;
2115	err = nla_put_64bit(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft,
2116			    XFRMA_PAD);
2117	if (err)
2118		goto out_cancel;
2119
2120	if (id->flags & XFRM_AE_RTHR) {
2121		err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
2122		if (err)
2123			goto out_cancel;
2124	}
2125	if (id->flags & XFRM_AE_ETHR) {
2126		err = nla_put_u32(skb, XFRMA_ETIMER_THRESH,
2127				  x->replay_maxage * 10 / HZ);
2128		if (err)
2129			goto out_cancel;
2130	}
2131	err = xfrm_mark_put(skb, &x->mark);
2132	if (err)
2133		goto out_cancel;
2134
2135	err = xfrm_if_id_put(skb, x->if_id);
2136	if (err)
2137		goto out_cancel;
2138
2139	nlmsg_end(skb, nlh);
2140	return 0;
2141
2142out_cancel:
2143	nlmsg_cancel(skb, nlh);
2144	return err;
2145}
2146
2147static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
2148		struct nlattr **attrs)
2149{
2150	struct net *net = sock_net(skb->sk);
2151	struct xfrm_state *x;
2152	struct sk_buff *r_skb;
2153	int err;
2154	struct km_event c;
2155	u32 mark;
2156	struct xfrm_mark m;
2157	struct xfrm_aevent_id *p = nlmsg_data(nlh);
2158	struct xfrm_usersa_id *id = &p->sa_id;
2159
2160	mark = xfrm_mark_get(attrs, &m);
2161
2162	x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
2163	if (x == NULL)
2164		return -ESRCH;
2165
2166	r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2167	if (r_skb == NULL) {
2168		xfrm_state_put(x);
2169		return -ENOMEM;
2170	}
2171
2172	/*
2173	 * XXX: is this lock really needed - none of the other
2174	 * gets lock (the concern is things getting updated
2175	 * while we are still reading) - jhs
2176	*/
2177	spin_lock_bh(&x->lock);
2178	c.data.aevent = p->flags;
2179	c.seq = nlh->nlmsg_seq;
2180	c.portid = nlh->nlmsg_pid;
2181
2182	err = build_aevent(r_skb, x, &c);
2183	BUG_ON(err < 0);
2184
2185	err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid);
2186	spin_unlock_bh(&x->lock);
2187	xfrm_state_put(x);
2188	return err;
2189}
2190
2191static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
2192		struct nlattr **attrs)
2193{
2194	struct net *net = sock_net(skb->sk);
2195	struct xfrm_state *x;
2196	struct km_event c;
2197	int err = -EINVAL;
2198	u32 mark = 0;
2199	struct xfrm_mark m;
2200	struct xfrm_aevent_id *p = nlmsg_data(nlh);
2201	struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
2202	struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
2203	struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
2204	struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
2205	struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
2206
2207	if (!lt && !rp && !re && !et && !rt)
2208		return err;
2209
2210	/* pedantic mode - thou shalt sayeth replaceth */
2211	if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
2212		return err;
2213
2214	mark = xfrm_mark_get(attrs, &m);
2215
2216	x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
2217	if (x == NULL)
2218		return -ESRCH;
2219
2220	if (x->km.state != XFRM_STATE_VALID)
2221		goto out;
2222
2223	err = xfrm_replay_verify_len(x->replay_esn, re);
2224	if (err)
2225		goto out;
2226
2227	spin_lock_bh(&x->lock);
2228	xfrm_update_ae_params(x, attrs, 1);
2229	spin_unlock_bh(&x->lock);
2230
2231	c.event = nlh->nlmsg_type;
2232	c.seq = nlh->nlmsg_seq;
2233	c.portid = nlh->nlmsg_pid;
2234	c.data.aevent = XFRM_AE_CU;
2235	km_state_notify(x, &c);
2236	err = 0;
2237out:
2238	xfrm_state_put(x);
2239	return err;
2240}
2241
2242static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
2243		struct nlattr **attrs)
2244{
2245	struct net *net = sock_net(skb->sk);
2246	struct km_event c;
2247	u8 type = XFRM_POLICY_TYPE_MAIN;
2248	int err;
2249
2250	err = copy_from_user_policy_type(&type, attrs);
2251	if (err)
2252		return err;
2253
2254	err = xfrm_policy_flush(net, type, true);
2255	if (err) {
2256		if (err == -ESRCH) /* empty table */
2257			return 0;
2258		return err;
2259	}
2260
2261	c.data.type = type;
2262	c.event = nlh->nlmsg_type;
2263	c.seq = nlh->nlmsg_seq;
2264	c.portid = nlh->nlmsg_pid;
2265	c.net = net;
2266	km_policy_notify(NULL, 0, &c);
2267	return 0;
2268}
2269
2270static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2271		struct nlattr **attrs)
2272{
2273	struct net *net = sock_net(skb->sk);
2274	struct xfrm_policy *xp;
2275	struct xfrm_user_polexpire *up = nlmsg_data(nlh);
2276	struct xfrm_userpolicy_info *p = &up->pol;
2277	u8 type = XFRM_POLICY_TYPE_MAIN;
2278	int err = -ENOENT;
2279	struct xfrm_mark m;
2280	u32 if_id = 0;
2281
2282	err = copy_from_user_policy_type(&type, attrs);
2283	if (err)
2284		return err;
2285
2286	err = verify_policy_dir(p->dir);
2287	if (err)
2288		return err;
2289
2290	if (attrs[XFRMA_IF_ID])
2291		if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
2292
2293	xfrm_mark_get(attrs, &m);
2294
2295	if (p->index)
2296		xp = xfrm_policy_byid(net, &m, if_id, type, p->dir, p->index,
2297				      0, &err);
2298	else {
2299		struct nlattr *rt = attrs[XFRMA_SEC_CTX];
2300		struct xfrm_sec_ctx *ctx;
2301
2302		err = verify_sec_ctx_len(attrs);
2303		if (err)
2304			return err;
2305
2306		ctx = NULL;
2307		if (rt) {
2308			struct xfrm_user_sec_ctx *uctx = nla_data(rt);
2309
2310			err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
2311			if (err)
2312				return err;
2313		}
2314		xp = xfrm_policy_bysel_ctx(net, &m, if_id, type, p->dir,
2315					   &p->sel, ctx, 0, &err);
2316		security_xfrm_policy_free(ctx);
2317	}
2318	if (xp == NULL)
2319		return -ENOENT;
2320
2321	if (unlikely(xp->walk.dead))
2322		goto out;
2323
2324	err = 0;
2325	if (up->hard) {
2326		xfrm_policy_delete(xp, p->dir);
2327		xfrm_audit_policy_delete(xp, 1, true);
2328	}
2329	km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid);
2330
2331out:
2332	xfrm_pol_put(xp);
2333	return err;
2334}
2335
2336static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2337		struct nlattr **attrs)
2338{
2339	struct net *net = sock_net(skb->sk);
2340	struct xfrm_state *x;
2341	int err;
2342	struct xfrm_user_expire *ue = nlmsg_data(nlh);
2343	struct xfrm_usersa_info *p = &ue->state;
2344	struct xfrm_mark m;
2345	u32 mark = xfrm_mark_get(attrs, &m);
2346
2347	x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
2348
2349	err = -ENOENT;
2350	if (x == NULL)
2351		return err;
2352
2353	spin_lock_bh(&x->lock);
2354	err = -EINVAL;
2355	if (x->km.state != XFRM_STATE_VALID)
2356		goto out;
2357	km_state_expired(x, ue->hard, nlh->nlmsg_pid);
2358
2359	if (ue->hard) {
2360		__xfrm_state_delete(x);
2361		xfrm_audit_state_delete(x, 1, true);
2362	}
2363	err = 0;
2364out:
2365	spin_unlock_bh(&x->lock);
2366	xfrm_state_put(x);
2367	return err;
2368}
2369
2370static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
2371		struct nlattr **attrs)
2372{
2373	struct net *net = sock_net(skb->sk);
2374	struct xfrm_policy *xp;
2375	struct xfrm_user_tmpl *ut;
2376	int i;
2377	struct nlattr *rt = attrs[XFRMA_TMPL];
2378	struct xfrm_mark mark;
2379
2380	struct xfrm_user_acquire *ua = nlmsg_data(nlh);
2381	struct xfrm_state *x = xfrm_state_alloc(net);
2382	int err = -ENOMEM;
2383
2384	if (!x)
2385		goto nomem;
2386
2387	xfrm_mark_get(attrs, &mark);
2388
2389	err = verify_newpolicy_info(&ua->policy);
2390	if (err)
2391		goto free_state;
2392	err = verify_sec_ctx_len(attrs);
2393	if (err)
2394		goto free_state;
2395
2396	/*   build an XP */
2397	xp = xfrm_policy_construct(net, &ua->policy, attrs, &err);
2398	if (!xp)
2399		goto free_state;
2400
2401	memcpy(&x->id, &ua->id, sizeof(ua->id));
2402	memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
2403	memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
2404	xp->mark.m = x->mark.m = mark.m;
2405	xp->mark.v = x->mark.v = mark.v;
2406	ut = nla_data(rt);
2407	/* extract the templates and for each call km_key */
2408	for (i = 0; i < xp->xfrm_nr; i++, ut++) {
2409		struct xfrm_tmpl *t = &xp->xfrm_vec[i];
2410		memcpy(&x->id, &t->id, sizeof(x->id));
2411		x->props.mode = t->mode;
2412		x->props.reqid = t->reqid;
2413		x->props.family = ut->family;
2414		t->aalgos = ua->aalgos;
2415		t->ealgos = ua->ealgos;
2416		t->calgos = ua->calgos;
2417		err = km_query(x, t, xp);
2418
2419	}
2420
2421	xfrm_state_free(x);
2422	kfree(xp);
2423
2424	return 0;
2425
2426free_state:
2427	xfrm_state_free(x);
2428nomem:
2429	return err;
2430}
2431
2432#ifdef CONFIG_XFRM_MIGRATE
2433static int copy_from_user_migrate(struct xfrm_migrate *ma,
2434				  struct xfrm_kmaddress *k,
2435				  struct nlattr **attrs, int *num)
2436{
2437	struct nlattr *rt = attrs[XFRMA_MIGRATE];
2438	struct xfrm_user_migrate *um;
2439	int i, num_migrate;
2440
2441	if (k != NULL) {
2442		struct xfrm_user_kmaddress *uk;
2443
2444		uk = nla_data(attrs[XFRMA_KMADDRESS]);
2445		memcpy(&k->local, &uk->local, sizeof(k->local));
2446		memcpy(&k->remote, &uk->remote, sizeof(k->remote));
2447		k->family = uk->family;
2448		k->reserved = uk->reserved;
2449	}
2450
2451	um = nla_data(rt);
2452	num_migrate = nla_len(rt) / sizeof(*um);
2453
2454	if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
2455		return -EINVAL;
2456
2457	for (i = 0; i < num_migrate; i++, um++, ma++) {
2458		memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
2459		memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
2460		memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
2461		memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
2462
2463		ma->proto = um->proto;
2464		ma->mode = um->mode;
2465		ma->reqid = um->reqid;
2466
2467		ma->old_family = um->old_family;
2468		ma->new_family = um->new_family;
2469	}
2470
2471	*num = i;
2472	return 0;
2473}
2474
2475static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2476			   struct nlattr **attrs)
2477{
2478	struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
2479	struct xfrm_migrate m[XFRM_MAX_DEPTH];
2480	struct xfrm_kmaddress km, *kmp;
2481	u8 type;
2482	int err;
2483	int n = 0;
2484	struct net *net = sock_net(skb->sk);
2485	struct xfrm_encap_tmpl  *encap = NULL;
2486
2487	if (attrs[XFRMA_MIGRATE] == NULL)
2488		return -EINVAL;
2489
2490	kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
2491
2492	err = copy_from_user_policy_type(&type, attrs);
2493	if (err)
2494		return err;
2495
2496	err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
2497	if (err)
2498		return err;
2499
2500	if (!n)
2501		return 0;
2502
2503	if (attrs[XFRMA_ENCAP]) {
2504		encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
2505				sizeof(*encap), GFP_KERNEL);
2506		if (!encap)
2507			return -ENOMEM;
2508	}
2509
2510	err = xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net, encap);
2511
2512	kfree(encap);
2513
2514	return err;
2515}
2516#else
2517static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2518			   struct nlattr **attrs)
2519{
2520	return -ENOPROTOOPT;
2521}
2522#endif
2523
2524#ifdef CONFIG_XFRM_MIGRATE
2525static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
2526{
2527	struct xfrm_user_migrate um;
2528
2529	memset(&um, 0, sizeof(um));
2530	um.proto = m->proto;
2531	um.mode = m->mode;
2532	um.reqid = m->reqid;
2533	um.old_family = m->old_family;
2534	memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
2535	memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
2536	um.new_family = m->new_family;
2537	memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
2538	memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
2539
2540	return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
2541}
2542
2543static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
2544{
2545	struct xfrm_user_kmaddress uk;
2546
2547	memset(&uk, 0, sizeof(uk));
2548	uk.family = k->family;
2549	uk.reserved = k->reserved;
2550	memcpy(&uk.local, &k->local, sizeof(uk.local));
2551	memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
2552
2553	return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
2554}
2555
2556static inline unsigned int xfrm_migrate_msgsize(int num_migrate, int with_kma,
2557						int with_encp)
2558{
2559	return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
2560	      + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
2561	      + (with_encp ? nla_total_size(sizeof(struct xfrm_encap_tmpl)) : 0)
2562	      + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
2563	      + userpolicy_type_attrsize();
2564}
2565
2566static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
2567			 int num_migrate, const struct xfrm_kmaddress *k,
2568			 const struct xfrm_selector *sel,
2569			 const struct xfrm_encap_tmpl *encap, u8 dir, u8 type)
2570{
2571	const struct xfrm_migrate *mp;
2572	struct xfrm_userpolicy_id *pol_id;
2573	struct nlmsghdr *nlh;
2574	int i, err;
2575
2576	nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
2577	if (nlh == NULL)
2578		return -EMSGSIZE;
2579
2580	pol_id = nlmsg_data(nlh);
2581	/* copy data from selector, dir, and type to the pol_id */
2582	memset(pol_id, 0, sizeof(*pol_id));
2583	memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
2584	pol_id->dir = dir;
2585
2586	if (k != NULL) {
2587		err = copy_to_user_kmaddress(k, skb);
2588		if (err)
2589			goto out_cancel;
2590	}
2591	if (encap) {
2592		err = nla_put(skb, XFRMA_ENCAP, sizeof(*encap), encap);
2593		if (err)
2594			goto out_cancel;
2595	}
2596	err = copy_to_user_policy_type(type, skb);
2597	if (err)
2598		goto out_cancel;
2599	for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
2600		err = copy_to_user_migrate(mp, skb);
2601		if (err)
2602			goto out_cancel;
2603	}
2604
2605	nlmsg_end(skb, nlh);
2606	return 0;
2607
2608out_cancel:
2609	nlmsg_cancel(skb, nlh);
2610	return err;
2611}
2612
2613static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2614			     const struct xfrm_migrate *m, int num_migrate,
2615			     const struct xfrm_kmaddress *k,
2616			     const struct xfrm_encap_tmpl *encap)
2617{
2618	struct net *net = &init_net;
2619	struct sk_buff *skb;
2620	int err;
2621
2622	skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k, !!encap),
2623			GFP_ATOMIC);
2624	if (skb == NULL)
2625		return -ENOMEM;
2626
2627	/* build migrate */
2628	err = build_migrate(skb, m, num_migrate, k, sel, encap, dir, type);
2629	BUG_ON(err < 0);
2630
2631	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE);
2632}
2633#else
2634static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2635			     const struct xfrm_migrate *m, int num_migrate,
2636			     const struct xfrm_kmaddress *k,
2637			     const struct xfrm_encap_tmpl *encap)
2638{
2639	return -ENOPROTOOPT;
2640}
2641#endif
2642
2643#define XMSGSIZE(type) sizeof(struct type)
2644
2645const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
2646	[XFRM_MSG_NEWSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2647	[XFRM_MSG_DELSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2648	[XFRM_MSG_GETSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2649	[XFRM_MSG_NEWPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2650	[XFRM_MSG_DELPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2651	[XFRM_MSG_GETPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2652	[XFRM_MSG_ALLOCSPI    - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
2653	[XFRM_MSG_ACQUIRE     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
2654	[XFRM_MSG_EXPIRE      - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
2655	[XFRM_MSG_UPDPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2656	[XFRM_MSG_UPDSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2657	[XFRM_MSG_POLEXPIRE   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
2658	[XFRM_MSG_FLUSHSA     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
2659	[XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
2660	[XFRM_MSG_NEWAE       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2661	[XFRM_MSG_GETAE       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2662	[XFRM_MSG_REPORT      - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
2663	[XFRM_MSG_MIGRATE     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2664	[XFRM_MSG_GETSADINFO  - XFRM_MSG_BASE] = sizeof(u32),
2665	[XFRM_MSG_NEWSPDINFO  - XFRM_MSG_BASE] = sizeof(u32),
2666	[XFRM_MSG_GETSPDINFO  - XFRM_MSG_BASE] = sizeof(u32),
2667};
2668EXPORT_SYMBOL_GPL(xfrm_msg_min);
2669
2670#undef XMSGSIZE
2671
2672const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
2673	[XFRMA_SA]		= { .len = sizeof(struct xfrm_usersa_info)},
2674	[XFRMA_POLICY]		= { .len = sizeof(struct xfrm_userpolicy_info)},
2675	[XFRMA_LASTUSED]	= { .type = NLA_U64},
2676	[XFRMA_ALG_AUTH_TRUNC]	= { .len = sizeof(struct xfrm_algo_auth)},
2677	[XFRMA_ALG_AEAD]	= { .len = sizeof(struct xfrm_algo_aead) },
2678	[XFRMA_ALG_AUTH]	= { .len = sizeof(struct xfrm_algo) },
2679	[XFRMA_ALG_CRYPT]	= { .len = sizeof(struct xfrm_algo) },
2680	[XFRMA_ALG_COMP]	= { .len = sizeof(struct xfrm_algo) },
2681	[XFRMA_ENCAP]		= { .len = sizeof(struct xfrm_encap_tmpl) },
2682	[XFRMA_TMPL]		= { .len = sizeof(struct xfrm_user_tmpl) },
2683	[XFRMA_SEC_CTX]		= { .len = sizeof(struct xfrm_sec_ctx) },
2684	[XFRMA_LTIME_VAL]	= { .len = sizeof(struct xfrm_lifetime_cur) },
2685	[XFRMA_REPLAY_VAL]	= { .len = sizeof(struct xfrm_replay_state) },
2686	[XFRMA_REPLAY_THRESH]	= { .type = NLA_U32 },
2687	[XFRMA_ETIMER_THRESH]	= { .type = NLA_U32 },
2688	[XFRMA_SRCADDR]		= { .len = sizeof(xfrm_address_t) },
2689	[XFRMA_COADDR]		= { .len = sizeof(xfrm_address_t) },
2690	[XFRMA_POLICY_TYPE]	= { .len = sizeof(struct xfrm_userpolicy_type)},
2691	[XFRMA_MIGRATE]		= { .len = sizeof(struct xfrm_user_migrate) },
2692	[XFRMA_KMADDRESS]	= { .len = sizeof(struct xfrm_user_kmaddress) },
2693	[XFRMA_MARK]		= { .len = sizeof(struct xfrm_mark) },
2694	[XFRMA_TFCPAD]		= { .type = NLA_U32 },
2695	[XFRMA_REPLAY_ESN_VAL]	= { .len = sizeof(struct xfrm_replay_state_esn) },
2696	[XFRMA_SA_EXTRA_FLAGS]	= { .type = NLA_U32 },
2697	[XFRMA_PROTO]		= { .type = NLA_U8 },
2698	[XFRMA_ADDRESS_FILTER]	= { .len = sizeof(struct xfrm_address_filter) },
2699	[XFRMA_OFFLOAD_DEV]	= { .len = sizeof(struct xfrm_user_offload) },
2700	[XFRMA_SET_MARK]	= { .type = NLA_U32 },
2701	[XFRMA_SET_MARK_MASK]	= { .type = NLA_U32 },
2702	[XFRMA_IF_ID]		= { .type = NLA_U32 },
2703};
2704EXPORT_SYMBOL_GPL(xfrma_policy);
2705
2706static const struct nla_policy xfrma_spd_policy[XFRMA_SPD_MAX+1] = {
2707	[XFRMA_SPD_IPV4_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2708	[XFRMA_SPD_IPV6_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2709};
2710
2711static const struct xfrm_link {
2712	int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
2713	int (*start)(struct netlink_callback *);
2714	int (*dump)(struct sk_buff *, struct netlink_callback *);
2715	int (*done)(struct netlink_callback *);
2716	const struct nla_policy *nla_pol;
2717	int nla_max;
2718} xfrm_dispatch[XFRM_NR_MSGTYPES] = {
2719	[XFRM_MSG_NEWSA       - XFRM_MSG_BASE] = { .doit = xfrm_add_sa        },
2720	[XFRM_MSG_DELSA       - XFRM_MSG_BASE] = { .doit = xfrm_del_sa        },
2721	[XFRM_MSG_GETSA       - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
2722						   .dump = xfrm_dump_sa,
2723						   .done = xfrm_dump_sa_done  },
2724	[XFRM_MSG_NEWPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_add_policy    },
2725	[XFRM_MSG_DELPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_get_policy    },
2726	[XFRM_MSG_GETPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
2727						   .start = xfrm_dump_policy_start,
2728						   .dump = xfrm_dump_policy,
2729						   .done = xfrm_dump_policy_done },
2730	[XFRM_MSG_ALLOCSPI    - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
2731	[XFRM_MSG_ACQUIRE     - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire   },
2732	[XFRM_MSG_EXPIRE      - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
2733	[XFRM_MSG_UPDPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_add_policy    },
2734	[XFRM_MSG_UPDSA       - XFRM_MSG_BASE] = { .doit = xfrm_add_sa        },
2735	[XFRM_MSG_POLEXPIRE   - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
2736	[XFRM_MSG_FLUSHSA     - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa      },
2737	[XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy  },
2738	[XFRM_MSG_NEWAE       - XFRM_MSG_BASE] = { .doit = xfrm_new_ae  },
2739	[XFRM_MSG_GETAE       - XFRM_MSG_BASE] = { .doit = xfrm_get_ae  },
2740	[XFRM_MSG_MIGRATE     - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate    },
2741	[XFRM_MSG_GETSADINFO  - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo   },
2742	[XFRM_MSG_NEWSPDINFO  - XFRM_MSG_BASE] = { .doit = xfrm_set_spdinfo,
2743						   .nla_pol = xfrma_spd_policy,
2744						   .nla_max = XFRMA_SPD_MAX },
2745	[XFRM_MSG_GETSPDINFO  - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo   },
2746};
2747
2748static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
2749			     struct netlink_ext_ack *extack)
2750{
2751	struct net *net = sock_net(skb->sk);
2752	struct nlattr *attrs[XFRMA_MAX+1];
2753	const struct xfrm_link *link;
2754	struct nlmsghdr *nlh64 = NULL;
2755	int type, err;
2756
 
 
 
 
 
2757	type = nlh->nlmsg_type;
2758	if (type > XFRM_MSG_MAX)
2759		return -EINVAL;
2760
2761	type -= XFRM_MSG_BASE;
2762	link = &xfrm_dispatch[type];
2763
2764	/* All operations require privileges, even GET */
2765	if (!netlink_net_capable(skb, CAP_NET_ADMIN))
2766		return -EPERM;
2767
2768	if (in_compat_syscall()) {
2769		struct xfrm_translator *xtr = xfrm_get_translator();
2770
2771		if (!xtr)
2772			return -EOPNOTSUPP;
2773
2774		nlh64 = xtr->rcv_msg_compat(nlh, link->nla_max,
2775					    link->nla_pol, extack);
2776		xfrm_put_translator(xtr);
2777		if (IS_ERR(nlh64))
2778			return PTR_ERR(nlh64);
2779		if (nlh64)
2780			nlh = nlh64;
2781	}
2782
2783	if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
2784	     type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
2785	    (nlh->nlmsg_flags & NLM_F_DUMP)) {
2786		struct netlink_dump_control c = {
2787			.start = link->start,
2788			.dump = link->dump,
2789			.done = link->done,
2790		};
2791
2792		if (link->dump == NULL) {
2793			err = -EINVAL;
2794			goto err;
 
 
 
 
2795		}
2796
2797		err = netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
2798		goto err;
2799	}
2800
2801	err = nlmsg_parse_deprecated(nlh, xfrm_msg_min[type], attrs,
2802				     link->nla_max ? : XFRMA_MAX,
2803				     link->nla_pol ? : xfrma_policy, extack);
2804	if (err < 0)
2805		goto err;
2806
2807	if (link->doit == NULL) {
2808		err = -EINVAL;
2809		goto err;
2810	}
2811
2812	err = link->doit(skb, nlh, attrs);
2813
2814	/* We need to free skb allocated in xfrm_alloc_compat() before
2815	 * returning from this function, because consume_skb() won't take
2816	 * care of frag_list since netlink destructor sets
2817	 * sbk->head to NULL. (see netlink_skb_destructor())
2818	 */
2819	if (skb_has_frag_list(skb)) {
2820		kfree_skb(skb_shinfo(skb)->frag_list);
2821		skb_shinfo(skb)->frag_list = NULL;
2822	}
2823
2824err:
2825	kvfree(nlh64);
2826	return err;
2827}
2828
2829static void xfrm_netlink_rcv(struct sk_buff *skb)
2830{
2831	struct net *net = sock_net(skb->sk);
2832
2833	mutex_lock(&net->xfrm.xfrm_cfg_mutex);
2834	netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
2835	mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
2836}
2837
2838static inline unsigned int xfrm_expire_msgsize(void)
2839{
2840	return NLMSG_ALIGN(sizeof(struct xfrm_user_expire))
2841	       + nla_total_size(sizeof(struct xfrm_mark));
2842}
2843
2844static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
2845{
2846	struct xfrm_user_expire *ue;
2847	struct nlmsghdr *nlh;
2848	int err;
2849
2850	nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
2851	if (nlh == NULL)
2852		return -EMSGSIZE;
2853
2854	ue = nlmsg_data(nlh);
2855	copy_to_user_state(x, &ue->state);
2856	ue->hard = (c->data.hard != 0) ? 1 : 0;
2857	/* clear the padding bytes */
2858	memset(&ue->hard + 1, 0, sizeof(*ue) - offsetofend(typeof(*ue), hard));
2859
2860	err = xfrm_mark_put(skb, &x->mark);
2861	if (err)
2862		return err;
2863
2864	err = xfrm_if_id_put(skb, x->if_id);
2865	if (err)
2866		return err;
2867
2868	nlmsg_end(skb, nlh);
2869	return 0;
2870}
2871
2872static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
2873{
2874	struct net *net = xs_net(x);
2875	struct sk_buff *skb;
2876
2877	skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
2878	if (skb == NULL)
2879		return -ENOMEM;
2880
2881	if (build_expire(skb, x, c) < 0) {
2882		kfree_skb(skb);
2883		return -EMSGSIZE;
2884	}
2885
2886	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
2887}
2888
2889static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
2890{
2891	struct net *net = xs_net(x);
2892	struct sk_buff *skb;
2893	int err;
2894
2895	skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2896	if (skb == NULL)
2897		return -ENOMEM;
2898
2899	err = build_aevent(skb, x, c);
2900	BUG_ON(err < 0);
2901
2902	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS);
2903}
2904
2905static int xfrm_notify_sa_flush(const struct km_event *c)
2906{
2907	struct net *net = c->net;
2908	struct xfrm_usersa_flush *p;
2909	struct nlmsghdr *nlh;
2910	struct sk_buff *skb;
2911	int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
2912
2913	skb = nlmsg_new(len, GFP_ATOMIC);
2914	if (skb == NULL)
2915		return -ENOMEM;
2916
2917	nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
2918	if (nlh == NULL) {
2919		kfree_skb(skb);
2920		return -EMSGSIZE;
2921	}
2922
2923	p = nlmsg_data(nlh);
2924	p->proto = c->data.proto;
2925
2926	nlmsg_end(skb, nlh);
2927
2928	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
2929}
2930
2931static inline unsigned int xfrm_sa_len(struct xfrm_state *x)
2932{
2933	unsigned int l = 0;
2934	if (x->aead)
2935		l += nla_total_size(aead_len(x->aead));
2936	if (x->aalg) {
2937		l += nla_total_size(sizeof(struct xfrm_algo) +
2938				    (x->aalg->alg_key_len + 7) / 8);
2939		l += nla_total_size(xfrm_alg_auth_len(x->aalg));
2940	}
2941	if (x->ealg)
2942		l += nla_total_size(xfrm_alg_len(x->ealg));
2943	if (x->calg)
2944		l += nla_total_size(sizeof(*x->calg));
2945	if (x->encap)
2946		l += nla_total_size(sizeof(*x->encap));
2947	if (x->tfcpad)
2948		l += nla_total_size(sizeof(x->tfcpad));
2949	if (x->replay_esn)
2950		l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
2951	else
2952		l += nla_total_size(sizeof(struct xfrm_replay_state));
2953	if (x->security)
2954		l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2955				    x->security->ctx_len);
2956	if (x->coaddr)
2957		l += nla_total_size(sizeof(*x->coaddr));
2958	if (x->props.extra_flags)
2959		l += nla_total_size(sizeof(x->props.extra_flags));
2960	if (x->xso.dev)
2961		 l += nla_total_size(sizeof(x->xso));
2962	if (x->props.smark.v | x->props.smark.m) {
2963		l += nla_total_size(sizeof(x->props.smark.v));
2964		l += nla_total_size(sizeof(x->props.smark.m));
2965	}
2966	if (x->if_id)
2967		l += nla_total_size(sizeof(x->if_id));
2968
2969	/* Must count x->lastused as it may become non-zero behind our back. */
2970	l += nla_total_size_64bit(sizeof(u64));
2971
2972	return l;
2973}
2974
2975static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
2976{
2977	struct net *net = xs_net(x);
2978	struct xfrm_usersa_info *p;
2979	struct xfrm_usersa_id *id;
2980	struct nlmsghdr *nlh;
2981	struct sk_buff *skb;
2982	unsigned int len = xfrm_sa_len(x);
2983	unsigned int headlen;
2984	int err;
2985
2986	headlen = sizeof(*p);
2987	if (c->event == XFRM_MSG_DELSA) {
2988		len += nla_total_size(headlen);
2989		headlen = sizeof(*id);
2990		len += nla_total_size(sizeof(struct xfrm_mark));
2991	}
2992	len += NLMSG_ALIGN(headlen);
2993
2994	skb = nlmsg_new(len, GFP_ATOMIC);
2995	if (skb == NULL)
2996		return -ENOMEM;
2997
2998	nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
2999	err = -EMSGSIZE;
3000	if (nlh == NULL)
3001		goto out_free_skb;
3002
3003	p = nlmsg_data(nlh);
3004	if (c->event == XFRM_MSG_DELSA) {
3005		struct nlattr *attr;
3006
3007		id = nlmsg_data(nlh);
3008		memset(id, 0, sizeof(*id));
3009		memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
3010		id->spi = x->id.spi;
3011		id->family = x->props.family;
3012		id->proto = x->id.proto;
3013
3014		attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
3015		err = -EMSGSIZE;
3016		if (attr == NULL)
3017			goto out_free_skb;
3018
3019		p = nla_data(attr);
3020	}
3021	err = copy_to_user_state_extra(x, p, skb);
3022	if (err)
3023		goto out_free_skb;
3024
3025	nlmsg_end(skb, nlh);
3026
3027	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
3028
3029out_free_skb:
3030	kfree_skb(skb);
3031	return err;
3032}
3033
3034static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
3035{
3036
3037	switch (c->event) {
3038	case XFRM_MSG_EXPIRE:
3039		return xfrm_exp_state_notify(x, c);
3040	case XFRM_MSG_NEWAE:
3041		return xfrm_aevent_state_notify(x, c);
3042	case XFRM_MSG_DELSA:
3043	case XFRM_MSG_UPDSA:
3044	case XFRM_MSG_NEWSA:
3045		return xfrm_notify_sa(x, c);
3046	case XFRM_MSG_FLUSHSA:
3047		return xfrm_notify_sa_flush(c);
3048	default:
3049		printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
3050		       c->event);
3051		break;
3052	}
3053
3054	return 0;
3055
3056}
3057
3058static inline unsigned int xfrm_acquire_msgsize(struct xfrm_state *x,
3059						struct xfrm_policy *xp)
3060{
3061	return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
3062	       + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
3063	       + nla_total_size(sizeof(struct xfrm_mark))
3064	       + nla_total_size(xfrm_user_sec_ctx_size(x->security))
3065	       + userpolicy_type_attrsize();
3066}
3067
3068static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
3069			 struct xfrm_tmpl *xt, struct xfrm_policy *xp)
3070{
3071	__u32 seq = xfrm_get_acqseq();
3072	struct xfrm_user_acquire *ua;
3073	struct nlmsghdr *nlh;
3074	int err;
3075
3076	nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
3077	if (nlh == NULL)
3078		return -EMSGSIZE;
3079
3080	ua = nlmsg_data(nlh);
3081	memcpy(&ua->id, &x->id, sizeof(ua->id));
3082	memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
3083	memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
3084	copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT);
3085	ua->aalgos = xt->aalgos;
3086	ua->ealgos = xt->ealgos;
3087	ua->calgos = xt->calgos;
3088	ua->seq = x->km.seq = seq;
3089
3090	err = copy_to_user_tmpl(xp, skb);
3091	if (!err)
3092		err = copy_to_user_state_sec_ctx(x, skb);
3093	if (!err)
3094		err = copy_to_user_policy_type(xp->type, skb);
3095	if (!err)
3096		err = xfrm_mark_put(skb, &xp->mark);
3097	if (!err)
3098		err = xfrm_if_id_put(skb, xp->if_id);
3099	if (err) {
3100		nlmsg_cancel(skb, nlh);
3101		return err;
3102	}
3103
3104	nlmsg_end(skb, nlh);
3105	return 0;
3106}
3107
3108static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
3109			     struct xfrm_policy *xp)
3110{
3111	struct net *net = xs_net(x);
3112	struct sk_buff *skb;
3113	int err;
3114
3115	skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
3116	if (skb == NULL)
3117		return -ENOMEM;
3118
3119	err = build_acquire(skb, x, xt, xp);
3120	BUG_ON(err < 0);
3121
3122	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE);
3123}
3124
3125/* User gives us xfrm_user_policy_info followed by an array of 0
3126 * or more templates.
3127 */
3128static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
3129					       u8 *data, int len, int *dir)
3130{
3131	struct net *net = sock_net(sk);
3132	struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
3133	struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
3134	struct xfrm_policy *xp;
3135	int nr;
3136
3137	switch (sk->sk_family) {
3138	case AF_INET:
3139		if (opt != IP_XFRM_POLICY) {
3140			*dir = -EOPNOTSUPP;
3141			return NULL;
3142		}
3143		break;
3144#if IS_ENABLED(CONFIG_IPV6)
3145	case AF_INET6:
3146		if (opt != IPV6_XFRM_POLICY) {
3147			*dir = -EOPNOTSUPP;
3148			return NULL;
3149		}
3150		break;
3151#endif
3152	default:
3153		*dir = -EINVAL;
3154		return NULL;
3155	}
3156
3157	*dir = -EINVAL;
3158
3159	if (len < sizeof(*p) ||
3160	    verify_newpolicy_info(p))
3161		return NULL;
3162
3163	nr = ((len - sizeof(*p)) / sizeof(*ut));
3164	if (validate_tmpl(nr, ut, p->sel.family))
3165		return NULL;
3166
3167	if (p->dir > XFRM_POLICY_OUT)
3168		return NULL;
3169
3170	xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3171	if (xp == NULL) {
3172		*dir = -ENOBUFS;
3173		return NULL;
3174	}
3175
3176	copy_from_user_policy(xp, p);
3177	xp->type = XFRM_POLICY_TYPE_MAIN;
3178	copy_templates(xp, ut, nr);
3179
3180	*dir = p->dir;
3181
3182	return xp;
3183}
3184
3185static inline unsigned int xfrm_polexpire_msgsize(struct xfrm_policy *xp)
3186{
3187	return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
3188	       + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
3189	       + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
3190	       + nla_total_size(sizeof(struct xfrm_mark))
3191	       + userpolicy_type_attrsize();
3192}
3193
3194static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
3195			   int dir, const struct km_event *c)
3196{
3197	struct xfrm_user_polexpire *upe;
3198	int hard = c->data.hard;
3199	struct nlmsghdr *nlh;
3200	int err;
3201
3202	nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
3203	if (nlh == NULL)
3204		return -EMSGSIZE;
3205
3206	upe = nlmsg_data(nlh);
3207	copy_to_user_policy(xp, &upe->pol, dir);
3208	err = copy_to_user_tmpl(xp, skb);
3209	if (!err)
3210		err = copy_to_user_sec_ctx(xp, skb);
3211	if (!err)
3212		err = copy_to_user_policy_type(xp->type, skb);
3213	if (!err)
3214		err = xfrm_mark_put(skb, &xp->mark);
3215	if (!err)
3216		err = xfrm_if_id_put(skb, xp->if_id);
3217	if (err) {
3218		nlmsg_cancel(skb, nlh);
3219		return err;
3220	}
3221	upe->hard = !!hard;
3222
3223	nlmsg_end(skb, nlh);
3224	return 0;
3225}
3226
3227static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3228{
3229	struct net *net = xp_net(xp);
3230	struct sk_buff *skb;
3231	int err;
3232
3233	skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
3234	if (skb == NULL)
3235		return -ENOMEM;
3236
3237	err = build_polexpire(skb, xp, dir, c);
3238	BUG_ON(err < 0);
3239
3240	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
3241}
3242
3243static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
3244{
3245	unsigned int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
3246	struct net *net = xp_net(xp);
3247	struct xfrm_userpolicy_info *p;
3248	struct xfrm_userpolicy_id *id;
3249	struct nlmsghdr *nlh;
3250	struct sk_buff *skb;
3251	unsigned int headlen;
3252	int err;
3253
3254	headlen = sizeof(*p);
3255	if (c->event == XFRM_MSG_DELPOLICY) {
3256		len += nla_total_size(headlen);
3257		headlen = sizeof(*id);
3258	}
3259	len += userpolicy_type_attrsize();
3260	len += nla_total_size(sizeof(struct xfrm_mark));
3261	len += NLMSG_ALIGN(headlen);
3262
3263	skb = nlmsg_new(len, GFP_ATOMIC);
3264	if (skb == NULL)
3265		return -ENOMEM;
3266
3267	nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
3268	err = -EMSGSIZE;
3269	if (nlh == NULL)
3270		goto out_free_skb;
3271
3272	p = nlmsg_data(nlh);
3273	if (c->event == XFRM_MSG_DELPOLICY) {
3274		struct nlattr *attr;
3275
3276		id = nlmsg_data(nlh);
3277		memset(id, 0, sizeof(*id));
3278		id->dir = dir;
3279		if (c->data.byid)
3280			id->index = xp->index;
3281		else
3282			memcpy(&id->sel, &xp->selector, sizeof(id->sel));
3283
3284		attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
3285		err = -EMSGSIZE;
3286		if (attr == NULL)
3287			goto out_free_skb;
3288
3289		p = nla_data(attr);
3290	}
3291
3292	copy_to_user_policy(xp, p, dir);
3293	err = copy_to_user_tmpl(xp, skb);
3294	if (!err)
3295		err = copy_to_user_policy_type(xp->type, skb);
3296	if (!err)
3297		err = xfrm_mark_put(skb, &xp->mark);
3298	if (!err)
3299		err = xfrm_if_id_put(skb, xp->if_id);
3300	if (err)
3301		goto out_free_skb;
3302
3303	nlmsg_end(skb, nlh);
3304
3305	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
3306
3307out_free_skb:
3308	kfree_skb(skb);
3309	return err;
3310}
3311
3312static int xfrm_notify_policy_flush(const struct km_event *c)
3313{
3314	struct net *net = c->net;
3315	struct nlmsghdr *nlh;
3316	struct sk_buff *skb;
3317	int err;
3318
3319	skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
3320	if (skb == NULL)
3321		return -ENOMEM;
3322
3323	nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
3324	err = -EMSGSIZE;
3325	if (nlh == NULL)
3326		goto out_free_skb;
3327	err = copy_to_user_policy_type(c->data.type, skb);
3328	if (err)
3329		goto out_free_skb;
3330
3331	nlmsg_end(skb, nlh);
3332
3333	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
3334
3335out_free_skb:
3336	kfree_skb(skb);
3337	return err;
3338}
3339
3340static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3341{
3342
3343	switch (c->event) {
3344	case XFRM_MSG_NEWPOLICY:
3345	case XFRM_MSG_UPDPOLICY:
3346	case XFRM_MSG_DELPOLICY:
3347		return xfrm_notify_policy(xp, dir, c);
3348	case XFRM_MSG_FLUSHPOLICY:
3349		return xfrm_notify_policy_flush(c);
3350	case XFRM_MSG_POLEXPIRE:
3351		return xfrm_exp_policy_notify(xp, dir, c);
3352	default:
3353		printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
3354		       c->event);
3355	}
3356
3357	return 0;
3358
3359}
3360
3361static inline unsigned int xfrm_report_msgsize(void)
3362{
3363	return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
3364}
3365
3366static int build_report(struct sk_buff *skb, u8 proto,
3367			struct xfrm_selector *sel, xfrm_address_t *addr)
3368{
3369	struct xfrm_user_report *ur;
3370	struct nlmsghdr *nlh;
3371
3372	nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
3373	if (nlh == NULL)
3374		return -EMSGSIZE;
3375
3376	ur = nlmsg_data(nlh);
3377	ur->proto = proto;
3378	memcpy(&ur->sel, sel, sizeof(ur->sel));
3379
3380	if (addr) {
3381		int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr);
3382		if (err) {
3383			nlmsg_cancel(skb, nlh);
3384			return err;
3385		}
3386	}
3387	nlmsg_end(skb, nlh);
3388	return 0;
3389}
3390
3391static int xfrm_send_report(struct net *net, u8 proto,
3392			    struct xfrm_selector *sel, xfrm_address_t *addr)
3393{
3394	struct sk_buff *skb;
3395	int err;
3396
3397	skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
3398	if (skb == NULL)
3399		return -ENOMEM;
3400
3401	err = build_report(skb, proto, sel, addr);
3402	BUG_ON(err < 0);
3403
3404	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT);
3405}
3406
3407static inline unsigned int xfrm_mapping_msgsize(void)
3408{
3409	return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
3410}
3411
3412static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
3413			 xfrm_address_t *new_saddr, __be16 new_sport)
3414{
3415	struct xfrm_user_mapping *um;
3416	struct nlmsghdr *nlh;
3417
3418	nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
3419	if (nlh == NULL)
3420		return -EMSGSIZE;
3421
3422	um = nlmsg_data(nlh);
3423
3424	memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
3425	um->id.spi = x->id.spi;
3426	um->id.family = x->props.family;
3427	um->id.proto = x->id.proto;
3428	memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
3429	memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
3430	um->new_sport = new_sport;
3431	um->old_sport = x->encap->encap_sport;
3432	um->reqid = x->props.reqid;
3433
3434	nlmsg_end(skb, nlh);
3435	return 0;
3436}
3437
3438static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
3439			     __be16 sport)
3440{
3441	struct net *net = xs_net(x);
3442	struct sk_buff *skb;
3443	int err;
3444
3445	if (x->id.proto != IPPROTO_ESP)
3446		return -EINVAL;
3447
3448	if (!x->encap)
3449		return -EINVAL;
3450
3451	skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
3452	if (skb == NULL)
3453		return -ENOMEM;
3454
3455	err = build_mapping(skb, x, ipaddr, sport);
3456	BUG_ON(err < 0);
3457
3458	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING);
3459}
3460
3461static bool xfrm_is_alive(const struct km_event *c)
3462{
3463	return (bool)xfrm_acquire_is_on(c->net);
3464}
3465
3466static struct xfrm_mgr netlink_mgr = {
3467	.notify		= xfrm_send_state_notify,
3468	.acquire	= xfrm_send_acquire,
3469	.compile_policy	= xfrm_compile_policy,
3470	.notify_policy	= xfrm_send_policy_notify,
3471	.report		= xfrm_send_report,
3472	.migrate	= xfrm_send_migrate,
3473	.new_mapping	= xfrm_send_mapping,
3474	.is_alive	= xfrm_is_alive,
3475};
3476
3477static int __net_init xfrm_user_net_init(struct net *net)
3478{
3479	struct sock *nlsk;
3480	struct netlink_kernel_cfg cfg = {
3481		.groups	= XFRMNLGRP_MAX,
3482		.input	= xfrm_netlink_rcv,
3483	};
3484
3485	nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg);
3486	if (nlsk == NULL)
3487		return -ENOMEM;
3488	net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
3489	rcu_assign_pointer(net->xfrm.nlsk, nlsk);
3490	return 0;
3491}
3492
3493static void __net_exit xfrm_user_net_pre_exit(struct net *net)
3494{
3495	RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
3496}
3497
3498static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
3499{
3500	struct net *net;
3501
 
 
3502	list_for_each_entry(net, net_exit_list, exit_list)
3503		netlink_kernel_release(net->xfrm.nlsk_stash);
3504}
3505
3506static struct pernet_operations xfrm_user_net_ops = {
3507	.init	    = xfrm_user_net_init,
3508	.pre_exit   = xfrm_user_net_pre_exit,
3509	.exit_batch = xfrm_user_net_exit,
3510};
3511
3512static int __init xfrm_user_init(void)
3513{
3514	int rv;
3515
3516	printk(KERN_INFO "Initializing XFRM netlink socket\n");
3517
3518	rv = register_pernet_subsys(&xfrm_user_net_ops);
3519	if (rv < 0)
3520		return rv;
3521	rv = xfrm_register_km(&netlink_mgr);
3522	if (rv < 0)
3523		unregister_pernet_subsys(&xfrm_user_net_ops);
3524	return rv;
3525}
3526
3527static void __exit xfrm_user_exit(void)
3528{
3529	xfrm_unregister_km(&netlink_mgr);
3530	unregister_pernet_subsys(&xfrm_user_net_ops);
3531}
3532
3533module_init(xfrm_user_init);
3534module_exit(xfrm_user_exit);
3535MODULE_LICENSE("GPL");
3536MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);