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