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/compat.h>
  15#include <linux/crypto.h>
  16#include <linux/module.h>
  17#include <linux/kernel.h>
  18#include <linux/types.h>
  19#include <linux/slab.h>
  20#include <linux/socket.h>
  21#include <linux/string.h>
  22#include <linux/net.h>
  23#include <linux/skbuff.h>
  24#include <linux/pfkeyv2.h>
  25#include <linux/ipsec.h>
  26#include <linux/init.h>
  27#include <linux/security.h>
  28#include <net/sock.h>
  29#include <net/xfrm.h>
  30#include <net/netlink.h>
  31#include <net/ah.h>
  32#include <linux/uaccess.h>
  33#if IS_ENABLED(CONFIG_IPV6)
  34#include <linux/in6.h>
  35#endif
  36#include <asm/unaligned.h>
  37
  38static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type,
  39			  struct netlink_ext_ack *extack)
  40{
  41	struct nlattr *rt = attrs[type];
  42	struct xfrm_algo *algp;
  43
  44	if (!rt)
  45		return 0;
  46
  47	algp = nla_data(rt);
  48	if (nla_len(rt) < (int)xfrm_alg_len(algp)) {
  49		NL_SET_ERR_MSG(extack, "Invalid AUTH/CRYPT/COMP attribute length");
  50		return -EINVAL;
  51	}
  52
  53	switch (type) {
  54	case XFRMA_ALG_AUTH:
  55	case XFRMA_ALG_CRYPT:
  56	case XFRMA_ALG_COMP:
  57		break;
  58
  59	default:
  60		NL_SET_ERR_MSG(extack, "Invalid algorithm attribute type");
  61		return -EINVAL;
  62	}
  63
  64	algp->alg_name[sizeof(algp->alg_name) - 1] = '\0';
  65	return 0;
  66}
  67
  68static int verify_auth_trunc(struct nlattr **attrs,
  69			     struct netlink_ext_ack *extack)
  70{
  71	struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC];
  72	struct xfrm_algo_auth *algp;
  73
  74	if (!rt)
  75		return 0;
  76
  77	algp = nla_data(rt);
  78	if (nla_len(rt) < (int)xfrm_alg_auth_len(algp)) {
  79		NL_SET_ERR_MSG(extack, "Invalid AUTH_TRUNC attribute length");
  80		return -EINVAL;
  81	}
  82
  83	algp->alg_name[sizeof(algp->alg_name) - 1] = '\0';
  84	return 0;
  85}
  86
  87static int verify_aead(struct nlattr **attrs, struct netlink_ext_ack *extack)
  88{
  89	struct nlattr *rt = attrs[XFRMA_ALG_AEAD];
  90	struct xfrm_algo_aead *algp;
  91
  92	if (!rt)
  93		return 0;
  94
  95	algp = nla_data(rt);
  96	if (nla_len(rt) < (int)aead_len(algp)) {
  97		NL_SET_ERR_MSG(extack, "Invalid AEAD attribute length");
  98		return -EINVAL;
  99	}
 100
 101	algp->alg_name[sizeof(algp->alg_name) - 1] = '\0';
 102	return 0;
 103}
 104
 105static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type,
 106			   xfrm_address_t **addrp)
 107{
 108	struct nlattr *rt = attrs[type];
 109
 110	if (rt && addrp)
 111		*addrp = nla_data(rt);
 112}
 113
 114static inline int verify_sec_ctx_len(struct nlattr **attrs, struct netlink_ext_ack *extack)
 115{
 116	struct nlattr *rt = attrs[XFRMA_SEC_CTX];
 117	struct xfrm_user_sec_ctx *uctx;
 118
 119	if (!rt)
 120		return 0;
 121
 122	uctx = nla_data(rt);
 123	if (uctx->len > nla_len(rt) ||
 124	    uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len)) {
 125		NL_SET_ERR_MSG(extack, "Invalid security context length");
 126		return -EINVAL;
 127	}
 128
 129	return 0;
 130}
 131
 132static inline int verify_replay(struct xfrm_usersa_info *p,
 133				struct nlattr **attrs,
 134				struct netlink_ext_ack *extack)
 135{
 136	struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL];
 137	struct xfrm_replay_state_esn *rs;
 138
 139	if (!rt) {
 140		if (p->flags & XFRM_STATE_ESN) {
 141			NL_SET_ERR_MSG(extack, "Missing required attribute for ESN");
 142			return -EINVAL;
 143		}
 144		return 0;
 145	}
 146
 147	rs = nla_data(rt);
 148
 149	if (rs->bmp_len > XFRMA_REPLAY_ESN_MAX / sizeof(rs->bmp[0]) / 8) {
 150		NL_SET_ERR_MSG(extack, "ESN bitmap length must be <= 128");
 151		return -EINVAL;
 152	}
 153
 154	if (nla_len(rt) < (int)xfrm_replay_state_esn_len(rs) &&
 155	    nla_len(rt) != sizeof(*rs)) {
 156		NL_SET_ERR_MSG(extack, "ESN attribute is too short to fit the full bitmap length");
 157		return -EINVAL;
 158	}
 159
 160	/* As only ESP and AH support ESN feature. */
 161	if ((p->id.proto != IPPROTO_ESP) && (p->id.proto != IPPROTO_AH)) {
 162		NL_SET_ERR_MSG(extack, "ESN only supported for ESP and AH");
 163		return -EINVAL;
 164	}
 165
 166	if (p->replay_window != 0) {
 167		NL_SET_ERR_MSG(extack, "ESN not compatible with legacy replay_window");
 168		return -EINVAL;
 169	}
 170
 171	return 0;
 172}
 173
 174static int verify_newsa_info(struct xfrm_usersa_info *p,
 175			     struct nlattr **attrs,
 176			     struct netlink_ext_ack *extack)
 177{
 178	int err;
 179
 180	err = -EINVAL;
 181	switch (p->family) {
 182	case AF_INET:
 183		break;
 184
 185	case AF_INET6:
 186#if IS_ENABLED(CONFIG_IPV6)
 187		break;
 188#else
 189		err = -EAFNOSUPPORT;
 190		NL_SET_ERR_MSG(extack, "IPv6 support disabled");
 191		goto out;
 192#endif
 193
 194	default:
 195		NL_SET_ERR_MSG(extack, "Invalid address family");
 196		goto out;
 197	}
 198
 199	switch (p->sel.family) {
 200	case AF_UNSPEC:
 201		break;
 202
 203	case AF_INET:
 204		if (p->sel.prefixlen_d > 32 || p->sel.prefixlen_s > 32) {
 205			NL_SET_ERR_MSG(extack, "Invalid prefix length in selector (must be <= 32 for IPv4)");
 206			goto out;
 207		}
 208
 209		break;
 210
 211	case AF_INET6:
 212#if IS_ENABLED(CONFIG_IPV6)
 213		if (p->sel.prefixlen_d > 128 || p->sel.prefixlen_s > 128) {
 214			NL_SET_ERR_MSG(extack, "Invalid prefix length in selector (must be <= 128 for IPv6)");
 215			goto out;
 216		}
 217
 218		break;
 219#else
 220		NL_SET_ERR_MSG(extack, "IPv6 support disabled");
 221		err = -EAFNOSUPPORT;
 222		goto out;
 223#endif
 224
 225	default:
 226		NL_SET_ERR_MSG(extack, "Invalid address family in selector");
 227		goto out;
 228	}
 229
 230	err = -EINVAL;
 231	switch (p->id.proto) {
 232	case IPPROTO_AH:
 233		if (!attrs[XFRMA_ALG_AUTH]	&&
 234		    !attrs[XFRMA_ALG_AUTH_TRUNC]) {
 235			NL_SET_ERR_MSG(extack, "Missing required attribute for AH: AUTH_TRUNC or AUTH");
 236			goto out;
 237		}
 238
 239		if (attrs[XFRMA_ALG_AEAD]	||
 240		    attrs[XFRMA_ALG_CRYPT]	||
 241		    attrs[XFRMA_ALG_COMP]	||
 242		    attrs[XFRMA_TFCPAD]) {
 243			NL_SET_ERR_MSG(extack, "Invalid attributes for AH: AEAD, CRYPT, COMP, TFCPAD");
 244			goto out;
 245		}
 246		break;
 247
 248	case IPPROTO_ESP:
 249		if (attrs[XFRMA_ALG_COMP]) {
 250			NL_SET_ERR_MSG(extack, "Invalid attribute for ESP: COMP");
 251			goto out;
 252		}
 253
 254		if (!attrs[XFRMA_ALG_AUTH] &&
 255		    !attrs[XFRMA_ALG_AUTH_TRUNC] &&
 256		    !attrs[XFRMA_ALG_CRYPT] &&
 257		    !attrs[XFRMA_ALG_AEAD]) {
 258			NL_SET_ERR_MSG(extack, "Missing required attribute for ESP: at least one of AUTH, AUTH_TRUNC, CRYPT, AEAD");
 259			goto out;
 260		}
 261
 262		if ((attrs[XFRMA_ALG_AUTH] ||
 263		     attrs[XFRMA_ALG_AUTH_TRUNC] ||
 264		     attrs[XFRMA_ALG_CRYPT]) &&
 265		    attrs[XFRMA_ALG_AEAD]) {
 266			NL_SET_ERR_MSG(extack, "Invalid attribute combination for ESP: AEAD can't be used with AUTH, AUTH_TRUNC, CRYPT");
 267			goto out;
 268		}
 269
 270		if (attrs[XFRMA_TFCPAD] &&
 271		    p->mode != XFRM_MODE_TUNNEL) {
 272			NL_SET_ERR_MSG(extack, "TFC padding can only be used in tunnel mode");
 273			goto out;
 274		}
 275		break;
 276
 277	case IPPROTO_COMP:
 278		if (!attrs[XFRMA_ALG_COMP]) {
 279			NL_SET_ERR_MSG(extack, "Missing required attribute for COMP: COMP");
 280			goto out;
 281		}
 282
 283		if (attrs[XFRMA_ALG_AEAD]	||
 284		    attrs[XFRMA_ALG_AUTH]	||
 285		    attrs[XFRMA_ALG_AUTH_TRUNC]	||
 286		    attrs[XFRMA_ALG_CRYPT]	||
 287		    attrs[XFRMA_TFCPAD]) {
 288			NL_SET_ERR_MSG(extack, "Invalid attributes for COMP: AEAD, AUTH, AUTH_TRUNC, CRYPT, TFCPAD");
 289			goto out;
 290		}
 291
 292		if (ntohl(p->id.spi) >= 0x10000) {
 293			NL_SET_ERR_MSG(extack, "SPI is too large for COMP (must be < 0x10000)");
 294			goto out;
 295		}
 296		break;
 297
 298#if IS_ENABLED(CONFIG_IPV6)
 299	case IPPROTO_DSTOPTS:
 300	case IPPROTO_ROUTING:
 301		if (attrs[XFRMA_ALG_COMP]	||
 302		    attrs[XFRMA_ALG_AUTH]	||
 303		    attrs[XFRMA_ALG_AUTH_TRUNC]	||
 304		    attrs[XFRMA_ALG_AEAD]	||
 305		    attrs[XFRMA_ALG_CRYPT]	||
 306		    attrs[XFRMA_ENCAP]		||
 307		    attrs[XFRMA_SEC_CTX]	||
 308		    attrs[XFRMA_TFCPAD]) {
 309			NL_SET_ERR_MSG(extack, "Invalid attributes for DSTOPTS/ROUTING");
 310			goto out;
 311		}
 312
 313		if (!attrs[XFRMA_COADDR]) {
 314			NL_SET_ERR_MSG(extack, "Missing required COADDR attribute for DSTOPTS/ROUTING");
 315			goto out;
 316		}
 317		break;
 318#endif
 319
 320	default:
 321		NL_SET_ERR_MSG(extack, "Unsupported protocol");
 322		goto out;
 323	}
 324
 325	if ((err = verify_aead(attrs, extack)))
 326		goto out;
 327	if ((err = verify_auth_trunc(attrs, extack)))
 328		goto out;
 329	if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH, extack)))
 330		goto out;
 331	if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT, extack)))
 332		goto out;
 333	if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP, extack)))
 334		goto out;
 335	if ((err = verify_sec_ctx_len(attrs, extack)))
 336		goto out;
 337	if ((err = verify_replay(p, attrs, extack)))
 338		goto out;
 339
 340	err = -EINVAL;
 341	switch (p->mode) {
 342	case XFRM_MODE_TRANSPORT:
 343	case XFRM_MODE_TUNNEL:
 344	case XFRM_MODE_ROUTEOPTIMIZATION:
 345	case XFRM_MODE_BEET:
 346		break;
 347
 348	default:
 349		NL_SET_ERR_MSG(extack, "Unsupported mode");
 350		goto out;
 351	}
 352
 353	err = 0;
 354
 355	if (attrs[XFRMA_MTIMER_THRESH]) {
 356		if (!attrs[XFRMA_ENCAP]) {
 357			NL_SET_ERR_MSG(extack, "MTIMER_THRESH attribute can only be set on ENCAP states");
 358			err = -EINVAL;
 359			goto out;
 360		}
 361	}
 362
 363out:
 364	return err;
 365}
 366
 367static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
 368			   struct xfrm_algo_desc *(*get_byname)(const char *, int),
 369			   struct nlattr *rta, struct netlink_ext_ack *extack)
 370{
 371	struct xfrm_algo *p, *ualg;
 372	struct xfrm_algo_desc *algo;
 373
 374	if (!rta)
 375		return 0;
 376
 377	ualg = nla_data(rta);
 378
 379	algo = get_byname(ualg->alg_name, 1);
 380	if (!algo) {
 381		NL_SET_ERR_MSG(extack, "Requested COMP algorithm not found");
 382		return -ENOSYS;
 383	}
 384	*props = algo->desc.sadb_alg_id;
 385
 386	p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
 387	if (!p)
 388		return -ENOMEM;
 389
 390	strcpy(p->alg_name, algo->name);
 391	*algpp = p;
 392	return 0;
 393}
 394
 395static int attach_crypt(struct xfrm_state *x, struct nlattr *rta,
 396			struct netlink_ext_ack *extack)
 397{
 398	struct xfrm_algo *p, *ualg;
 399	struct xfrm_algo_desc *algo;
 400
 401	if (!rta)
 402		return 0;
 403
 404	ualg = nla_data(rta);
 405
 406	algo = xfrm_ealg_get_byname(ualg->alg_name, 1);
 407	if (!algo) {
 408		NL_SET_ERR_MSG(extack, "Requested CRYPT algorithm not found");
 409		return -ENOSYS;
 410	}
 411	x->props.ealgo = algo->desc.sadb_alg_id;
 412
 413	p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
 414	if (!p)
 415		return -ENOMEM;
 416
 417	strcpy(p->alg_name, algo->name);
 418	x->ealg = p;
 419	x->geniv = algo->uinfo.encr.geniv;
 420	return 0;
 421}
 422
 423static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,
 424		       struct nlattr *rta, struct netlink_ext_ack *extack)
 425{
 426	struct xfrm_algo *ualg;
 427	struct xfrm_algo_auth *p;
 428	struct xfrm_algo_desc *algo;
 429
 430	if (!rta)
 431		return 0;
 432
 433	ualg = nla_data(rta);
 434
 435	algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
 436	if (!algo) {
 437		NL_SET_ERR_MSG(extack, "Requested AUTH algorithm not found");
 438		return -ENOSYS;
 439	}
 440	*props = algo->desc.sadb_alg_id;
 441
 442	p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL);
 443	if (!p)
 444		return -ENOMEM;
 445
 446	strcpy(p->alg_name, algo->name);
 447	p->alg_key_len = ualg->alg_key_len;
 448	p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
 449	memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8);
 450
 451	*algpp = p;
 452	return 0;
 453}
 454
 455static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,
 456			     struct nlattr *rta, struct netlink_ext_ack *extack)
 457{
 458	struct xfrm_algo_auth *p, *ualg;
 459	struct xfrm_algo_desc *algo;
 460
 461	if (!rta)
 462		return 0;
 463
 464	ualg = nla_data(rta);
 465
 466	algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
 467	if (!algo) {
 468		NL_SET_ERR_MSG(extack, "Requested AUTH_TRUNC algorithm not found");
 469		return -ENOSYS;
 470	}
 471	if (ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits) {
 472		NL_SET_ERR_MSG(extack, "Invalid length requested for truncated ICV");
 473		return -EINVAL;
 474	}
 475	*props = algo->desc.sadb_alg_id;
 476
 477	p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);
 478	if (!p)
 479		return -ENOMEM;
 480
 481	strcpy(p->alg_name, algo->name);
 482	if (!p->alg_trunc_len)
 483		p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
 484
 485	*algpp = p;
 486	return 0;
 487}
 488
 489static int attach_aead(struct xfrm_state *x, struct nlattr *rta,
 490		       struct netlink_ext_ack *extack)
 491{
 492	struct xfrm_algo_aead *p, *ualg;
 493	struct xfrm_algo_desc *algo;
 494
 495	if (!rta)
 496		return 0;
 497
 498	ualg = nla_data(rta);
 499
 500	algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
 501	if (!algo) {
 502		NL_SET_ERR_MSG(extack, "Requested AEAD algorithm not found");
 503		return -ENOSYS;
 504	}
 505	x->props.ealgo = algo->desc.sadb_alg_id;
 506
 507	p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
 508	if (!p)
 509		return -ENOMEM;
 510
 511	strcpy(p->alg_name, algo->name);
 512	x->aead = p;
 513	x->geniv = algo->uinfo.aead.geniv;
 514	return 0;
 515}
 516
 517static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn,
 518					 struct nlattr *rp,
 519					 struct netlink_ext_ack *extack)
 520{
 521	struct xfrm_replay_state_esn *up;
 522	unsigned int ulen;
 523
 524	if (!replay_esn || !rp)
 525		return 0;
 526
 527	up = nla_data(rp);
 528	ulen = xfrm_replay_state_esn_len(up);
 529
 530	/* Check the overall length and the internal bitmap length to avoid
 531	 * potential overflow. */
 532	if (nla_len(rp) < (int)ulen) {
 533		NL_SET_ERR_MSG(extack, "ESN attribute is too short");
 534		return -EINVAL;
 535	}
 536
 537	if (xfrm_replay_state_esn_len(replay_esn) != ulen) {
 538		NL_SET_ERR_MSG(extack, "New ESN size doesn't match the existing SA's ESN size");
 539		return -EINVAL;
 540	}
 541
 542	if (replay_esn->bmp_len != up->bmp_len) {
 543		NL_SET_ERR_MSG(extack, "New ESN bitmap size doesn't match the existing SA's ESN bitmap");
 544		return -EINVAL;
 545	}
 546
 547	if (up->replay_window > up->bmp_len * sizeof(__u32) * 8) {
 548		NL_SET_ERR_MSG(extack, "ESN replay window is longer than the bitmap");
 549		return -EINVAL;
 550	}
 551
 552	return 0;
 553}
 554
 555static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,
 556				       struct xfrm_replay_state_esn **preplay_esn,
 557				       struct nlattr *rta)
 558{
 559	struct xfrm_replay_state_esn *p, *pp, *up;
 560	unsigned int klen, ulen;
 561
 562	if (!rta)
 563		return 0;
 564
 565	up = nla_data(rta);
 566	klen = xfrm_replay_state_esn_len(up);
 567	ulen = nla_len(rta) >= (int)klen ? klen : sizeof(*up);
 568
 569	p = kzalloc(klen, GFP_KERNEL);
 570	if (!p)
 571		return -ENOMEM;
 572
 573	pp = kzalloc(klen, GFP_KERNEL);
 574	if (!pp) {
 575		kfree(p);
 576		return -ENOMEM;
 577	}
 578
 579	memcpy(p, up, ulen);
 580	memcpy(pp, up, ulen);
 581
 582	*replay_esn = p;
 583	*preplay_esn = pp;
 584
 585	return 0;
 586}
 587
 588static inline unsigned int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
 589{
 590	unsigned int len = 0;
 591
 592	if (xfrm_ctx) {
 593		len += sizeof(struct xfrm_user_sec_ctx);
 594		len += xfrm_ctx->ctx_len;
 595	}
 596	return len;
 597}
 598
 599static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
 600{
 601	memcpy(&x->id, &p->id, sizeof(x->id));
 602	memcpy(&x->sel, &p->sel, sizeof(x->sel));
 603	memcpy(&x->lft, &p->lft, sizeof(x->lft));
 604	x->props.mode = p->mode;
 605	x->props.replay_window = min_t(unsigned int, p->replay_window,
 606					sizeof(x->replay.bitmap) * 8);
 607	x->props.reqid = p->reqid;
 608	x->props.family = p->family;
 609	memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
 610	x->props.flags = p->flags;
 611
 612	if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
 613		x->sel.family = p->family;
 614}
 615
 616/*
 617 * someday when pfkey also has support, we could have the code
 618 * somehow made shareable and move it to xfrm_state.c - JHS
 619 *
 620*/
 621static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs,
 622				  int update_esn)
 623{
 624	struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
 625	struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL;
 626	struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
 627	struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
 628	struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
 629	struct nlattr *mt = attrs[XFRMA_MTIMER_THRESH];
 630
 631	if (re && x->replay_esn && x->preplay_esn) {
 632		struct xfrm_replay_state_esn *replay_esn;
 633		replay_esn = nla_data(re);
 634		memcpy(x->replay_esn, replay_esn,
 635		       xfrm_replay_state_esn_len(replay_esn));
 636		memcpy(x->preplay_esn, replay_esn,
 637		       xfrm_replay_state_esn_len(replay_esn));
 638	}
 639
 640	if (rp) {
 641		struct xfrm_replay_state *replay;
 642		replay = nla_data(rp);
 643		memcpy(&x->replay, replay, sizeof(*replay));
 644		memcpy(&x->preplay, replay, sizeof(*replay));
 645	}
 646
 647	if (lt) {
 648		struct xfrm_lifetime_cur *ltime;
 649		ltime = nla_data(lt);
 650		x->curlft.bytes = ltime->bytes;
 651		x->curlft.packets = ltime->packets;
 652		x->curlft.add_time = ltime->add_time;
 653		x->curlft.use_time = ltime->use_time;
 654	}
 655
 656	if (et)
 657		x->replay_maxage = nla_get_u32(et);
 658
 659	if (rt)
 660		x->replay_maxdiff = nla_get_u32(rt);
 661
 662	if (mt)
 663		x->mapping_maxage = nla_get_u32(mt);
 664}
 665
 666static void xfrm_smark_init(struct nlattr **attrs, struct xfrm_mark *m)
 667{
 668	if (attrs[XFRMA_SET_MARK]) {
 669		m->v = nla_get_u32(attrs[XFRMA_SET_MARK]);
 670		if (attrs[XFRMA_SET_MARK_MASK])
 671			m->m = nla_get_u32(attrs[XFRMA_SET_MARK_MASK]);
 672		else
 673			m->m = 0xffffffff;
 674	} else {
 675		m->v = m->m = 0;
 676	}
 677}
 678
 679static struct xfrm_state *xfrm_state_construct(struct net *net,
 680					       struct xfrm_usersa_info *p,
 681					       struct nlattr **attrs,
 682					       int *errp,
 683					       struct netlink_ext_ack *extack)
 684{
 685	struct xfrm_state *x = xfrm_state_alloc(net);
 686	int err = -ENOMEM;
 687
 688	if (!x)
 689		goto error_no_put;
 690
 691	copy_from_user_state(x, p);
 692
 693	if (attrs[XFRMA_ENCAP]) {
 694		x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
 695				   sizeof(*x->encap), GFP_KERNEL);
 696		if (x->encap == NULL)
 697			goto error;
 698	}
 699
 700	if (attrs[XFRMA_COADDR]) {
 701		x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
 702				    sizeof(*x->coaddr), GFP_KERNEL);
 703		if (x->coaddr == NULL)
 704			goto error;
 705	}
 706
 707	if (attrs[XFRMA_SA_EXTRA_FLAGS])
 708		x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]);
 709
 710	if ((err = attach_aead(x, attrs[XFRMA_ALG_AEAD], extack)))
 711		goto error;
 712	if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
 713				     attrs[XFRMA_ALG_AUTH_TRUNC], extack)))
 714		goto error;
 715	if (!x->props.aalgo) {
 716		if ((err = attach_auth(&x->aalg, &x->props.aalgo,
 717				       attrs[XFRMA_ALG_AUTH], extack)))
 718			goto error;
 719	}
 720	if ((err = attach_crypt(x, attrs[XFRMA_ALG_CRYPT], extack)))
 721		goto error;
 722	if ((err = attach_one_algo(&x->calg, &x->props.calgo,
 723				   xfrm_calg_get_byname,
 724				   attrs[XFRMA_ALG_COMP], extack)))
 725		goto error;
 726
 727	if (attrs[XFRMA_TFCPAD])
 728		x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);
 729
 730	xfrm_mark_get(attrs, &x->mark);
 731
 732	xfrm_smark_init(attrs, &x->props.smark);
 733
 734	if (attrs[XFRMA_IF_ID])
 735		x->if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
 736
 737	err = __xfrm_init_state(x, false, attrs[XFRMA_OFFLOAD_DEV], extack);
 738	if (err)
 739		goto error;
 740
 741	if (attrs[XFRMA_SEC_CTX]) {
 742		err = security_xfrm_state_alloc(x,
 743						nla_data(attrs[XFRMA_SEC_CTX]));
 744		if (err)
 745			goto error;
 746	}
 747
 748	if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn,
 749					       attrs[XFRMA_REPLAY_ESN_VAL])))
 750		goto error;
 751
 752	x->km.seq = p->seq;
 753	x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
 754	/* sysctl_xfrm_aevent_etime is in 100ms units */
 755	x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
 756
 757	if ((err = xfrm_init_replay(x, extack)))
 758		goto error;
 759
 760	/* override default values from above */
 761	xfrm_update_ae_params(x, attrs, 0);
 762
 763	/* configure the hardware if offload is requested */
 764	if (attrs[XFRMA_OFFLOAD_DEV]) {
 765		err = xfrm_dev_state_add(net, x,
 766					 nla_data(attrs[XFRMA_OFFLOAD_DEV]),
 767					 extack);
 768		if (err)
 769			goto error;
 770	}
 771
 772	return x;
 773
 774error:
 775	x->km.state = XFRM_STATE_DEAD;
 776	xfrm_state_put(x);
 777error_no_put:
 778	*errp = err;
 779	return NULL;
 780}
 781
 782static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
 783		       struct nlattr **attrs, struct netlink_ext_ack *extack)
 784{
 785	struct net *net = sock_net(skb->sk);
 786	struct xfrm_usersa_info *p = nlmsg_data(nlh);
 787	struct xfrm_state *x;
 788	int err;
 789	struct km_event c;
 790
 791	err = verify_newsa_info(p, attrs, extack);
 792	if (err)
 793		return err;
 794
 795	x = xfrm_state_construct(net, p, attrs, &err, extack);
 796	if (!x)
 797		return err;
 798
 799	xfrm_state_hold(x);
 800	if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
 801		err = xfrm_state_add(x);
 802	else
 803		err = xfrm_state_update(x);
 804
 805	xfrm_audit_state_add(x, err ? 0 : 1, true);
 806
 807	if (err < 0) {
 808		x->km.state = XFRM_STATE_DEAD;
 809		xfrm_dev_state_delete(x);
 810		__xfrm_state_put(x);
 811		goto out;
 812	}
 813
 814	if (x->km.state == XFRM_STATE_VOID)
 815		x->km.state = XFRM_STATE_VALID;
 816
 817	c.seq = nlh->nlmsg_seq;
 818	c.portid = nlh->nlmsg_pid;
 819	c.event = nlh->nlmsg_type;
 820
 821	km_state_notify(x, &c);
 822out:
 823	xfrm_state_put(x);
 824	return err;
 825}
 826
 827static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
 828						 struct xfrm_usersa_id *p,
 829						 struct nlattr **attrs,
 830						 int *errp)
 831{
 832	struct xfrm_state *x = NULL;
 833	struct xfrm_mark m;
 834	int err;
 835	u32 mark = xfrm_mark_get(attrs, &m);
 836
 837	if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
 838		err = -ESRCH;
 839		x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);
 840	} else {
 841		xfrm_address_t *saddr = NULL;
 842
 843		verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
 844		if (!saddr) {
 845			err = -EINVAL;
 846			goto out;
 847		}
 848
 849		err = -ESRCH;
 850		x = xfrm_state_lookup_byaddr(net, mark,
 851					     &p->daddr, saddr,
 852					     p->proto, p->family);
 853	}
 854
 855 out:
 856	if (!x && errp)
 857		*errp = err;
 858	return x;
 859}
 860
 861static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
 862		       struct nlattr **attrs, struct netlink_ext_ack *extack)
 863{
 864	struct net *net = sock_net(skb->sk);
 865	struct xfrm_state *x;
 866	int err = -ESRCH;
 867	struct km_event c;
 868	struct xfrm_usersa_id *p = nlmsg_data(nlh);
 869
 870	x = xfrm_user_state_lookup(net, p, attrs, &err);
 871	if (x == NULL)
 872		return err;
 873
 874	if ((err = security_xfrm_state_delete(x)) != 0)
 875		goto out;
 876
 877	if (xfrm_state_kern(x)) {
 878		NL_SET_ERR_MSG(extack, "SA is in use by tunnels");
 879		err = -EPERM;
 880		goto out;
 881	}
 882
 883	err = xfrm_state_delete(x);
 884	if (err < 0)
 885		goto out;
 886
 887	c.seq = nlh->nlmsg_seq;
 888	c.portid = nlh->nlmsg_pid;
 889	c.event = nlh->nlmsg_type;
 890	km_state_notify(x, &c);
 891
 892out:
 893	xfrm_audit_state_delete(x, err ? 0 : 1, true);
 894	xfrm_state_put(x);
 895	return err;
 896}
 897
 898static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
 899{
 900	memset(p, 0, sizeof(*p));
 901	memcpy(&p->id, &x->id, sizeof(p->id));
 902	memcpy(&p->sel, &x->sel, sizeof(p->sel));
 903	memcpy(&p->lft, &x->lft, sizeof(p->lft));
 904	if (x->xso.dev)
 905		xfrm_dev_state_update_curlft(x);
 906	memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
 907	put_unaligned(x->stats.replay_window, &p->stats.replay_window);
 908	put_unaligned(x->stats.replay, &p->stats.replay);
 909	put_unaligned(x->stats.integrity_failed, &p->stats.integrity_failed);
 910	memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
 911	p->mode = x->props.mode;
 912	p->replay_window = x->props.replay_window;
 913	p->reqid = x->props.reqid;
 914	p->family = x->props.family;
 915	p->flags = x->props.flags;
 916	p->seq = x->km.seq;
 917}
 918
 919struct xfrm_dump_info {
 920	struct sk_buff *in_skb;
 921	struct sk_buff *out_skb;
 922	u32 nlmsg_seq;
 923	u16 nlmsg_flags;
 924};
 925
 926static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
 927{
 928	struct xfrm_user_sec_ctx *uctx;
 929	struct nlattr *attr;
 930	int ctx_size = sizeof(*uctx) + s->ctx_len;
 931
 932	attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
 933	if (attr == NULL)
 934		return -EMSGSIZE;
 935
 936	uctx = nla_data(attr);
 937	uctx->exttype = XFRMA_SEC_CTX;
 938	uctx->len = ctx_size;
 939	uctx->ctx_doi = s->ctx_doi;
 940	uctx->ctx_alg = s->ctx_alg;
 941	uctx->ctx_len = s->ctx_len;
 942	memcpy(uctx + 1, s->ctx_str, s->ctx_len);
 943
 944	return 0;
 945}
 946
 947static int copy_user_offload(struct xfrm_dev_offload *xso, struct sk_buff *skb)
 948{
 949	struct xfrm_user_offload *xuo;
 950	struct nlattr *attr;
 951
 952	attr = nla_reserve(skb, XFRMA_OFFLOAD_DEV, sizeof(*xuo));
 953	if (attr == NULL)
 954		return -EMSGSIZE;
 955
 956	xuo = nla_data(attr);
 957	memset(xuo, 0, sizeof(*xuo));
 958	xuo->ifindex = xso->dev->ifindex;
 959	if (xso->dir == XFRM_DEV_OFFLOAD_IN)
 960		xuo->flags = XFRM_OFFLOAD_INBOUND;
 961	if (xso->type == XFRM_DEV_OFFLOAD_PACKET)
 962		xuo->flags |= XFRM_OFFLOAD_PACKET;
 963
 964	return 0;
 965}
 966
 967static bool xfrm_redact(void)
 968{
 969	return IS_ENABLED(CONFIG_SECURITY) &&
 970		security_locked_down(LOCKDOWN_XFRM_SECRET);
 971}
 972
 973static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
 974{
 975	struct xfrm_algo *algo;
 976	struct xfrm_algo_auth *ap;
 977	struct nlattr *nla;
 978	bool redact_secret = xfrm_redact();
 979
 980	nla = nla_reserve(skb, XFRMA_ALG_AUTH,
 981			  sizeof(*algo) + (auth->alg_key_len + 7) / 8);
 982	if (!nla)
 983		return -EMSGSIZE;
 984	algo = nla_data(nla);
 985	strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name));
 986
 987	if (redact_secret && auth->alg_key_len)
 988		memset(algo->alg_key, 0, (auth->alg_key_len + 7) / 8);
 989	else
 990		memcpy(algo->alg_key, auth->alg_key,
 991		       (auth->alg_key_len + 7) / 8);
 992	algo->alg_key_len = auth->alg_key_len;
 993
 994	nla = nla_reserve(skb, XFRMA_ALG_AUTH_TRUNC, xfrm_alg_auth_len(auth));
 995	if (!nla)
 996		return -EMSGSIZE;
 997	ap = nla_data(nla);
 998	memcpy(ap, auth, sizeof(struct xfrm_algo_auth));
 999	if (redact_secret && auth->alg_key_len)
1000		memset(ap->alg_key, 0, (auth->alg_key_len + 7) / 8);
1001	else
1002		memcpy(ap->alg_key, auth->alg_key,
1003		       (auth->alg_key_len + 7) / 8);
1004	return 0;
1005}
1006
1007static int copy_to_user_aead(struct xfrm_algo_aead *aead, struct sk_buff *skb)
1008{
1009	struct nlattr *nla = nla_reserve(skb, XFRMA_ALG_AEAD, aead_len(aead));
1010	struct xfrm_algo_aead *ap;
1011	bool redact_secret = xfrm_redact();
1012
1013	if (!nla)
1014		return -EMSGSIZE;
1015
1016	ap = nla_data(nla);
1017	strscpy_pad(ap->alg_name, aead->alg_name, sizeof(ap->alg_name));
1018	ap->alg_key_len = aead->alg_key_len;
1019	ap->alg_icv_len = aead->alg_icv_len;
1020
1021	if (redact_secret && aead->alg_key_len)
1022		memset(ap->alg_key, 0, (aead->alg_key_len + 7) / 8);
1023	else
1024		memcpy(ap->alg_key, aead->alg_key,
1025		       (aead->alg_key_len + 7) / 8);
1026	return 0;
1027}
1028
1029static int copy_to_user_ealg(struct xfrm_algo *ealg, struct sk_buff *skb)
1030{
1031	struct xfrm_algo *ap;
1032	bool redact_secret = xfrm_redact();
1033	struct nlattr *nla = nla_reserve(skb, XFRMA_ALG_CRYPT,
1034					 xfrm_alg_len(ealg));
1035	if (!nla)
1036		return -EMSGSIZE;
1037
1038	ap = nla_data(nla);
1039	strscpy_pad(ap->alg_name, ealg->alg_name, sizeof(ap->alg_name));
1040	ap->alg_key_len = ealg->alg_key_len;
1041
1042	if (redact_secret && ealg->alg_key_len)
1043		memset(ap->alg_key, 0, (ealg->alg_key_len + 7) / 8);
1044	else
1045		memcpy(ap->alg_key, ealg->alg_key,
1046		       (ealg->alg_key_len + 7) / 8);
1047
1048	return 0;
1049}
1050
1051static int copy_to_user_calg(struct xfrm_algo *calg, struct sk_buff *skb)
1052{
1053	struct nlattr *nla = nla_reserve(skb, XFRMA_ALG_COMP, sizeof(*calg));
1054	struct xfrm_algo *ap;
1055
1056	if (!nla)
1057		return -EMSGSIZE;
1058
1059	ap = nla_data(nla);
1060	strscpy_pad(ap->alg_name, calg->alg_name, sizeof(ap->alg_name));
1061	ap->alg_key_len = 0;
1062
1063	return 0;
1064}
1065
1066static int copy_to_user_encap(struct xfrm_encap_tmpl *ep, struct sk_buff *skb)
1067{
1068	struct nlattr *nla = nla_reserve(skb, XFRMA_ENCAP, sizeof(*ep));
1069	struct xfrm_encap_tmpl *uep;
1070
1071	if (!nla)
1072		return -EMSGSIZE;
1073
1074	uep = nla_data(nla);
1075	memset(uep, 0, sizeof(*uep));
1076
1077	uep->encap_type = ep->encap_type;
1078	uep->encap_sport = ep->encap_sport;
1079	uep->encap_dport = ep->encap_dport;
1080	uep->encap_oa = ep->encap_oa;
1081
1082	return 0;
1083}
1084
1085static int xfrm_smark_put(struct sk_buff *skb, struct xfrm_mark *m)
1086{
1087	int ret = 0;
1088
1089	if (m->v | m->m) {
1090		ret = nla_put_u32(skb, XFRMA_SET_MARK, m->v);
1091		if (!ret)
1092			ret = nla_put_u32(skb, XFRMA_SET_MARK_MASK, m->m);
1093	}
1094	return ret;
1095}
1096
1097/* Don't change this without updating xfrm_sa_len! */
1098static int copy_to_user_state_extra(struct xfrm_state *x,
1099				    struct xfrm_usersa_info *p,
1100				    struct sk_buff *skb)
1101{
1102	int ret = 0;
1103
1104	copy_to_user_state(x, p);
1105
1106	if (x->props.extra_flags) {
1107		ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS,
1108				  x->props.extra_flags);
1109		if (ret)
1110			goto out;
1111	}
1112
1113	if (x->coaddr) {
1114		ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
1115		if (ret)
1116			goto out;
1117	}
1118	if (x->lastused) {
1119		ret = nla_put_u64_64bit(skb, XFRMA_LASTUSED, x->lastused,
1120					XFRMA_PAD);
1121		if (ret)
1122			goto out;
1123	}
1124	if (x->aead) {
1125		ret = copy_to_user_aead(x->aead, skb);
1126		if (ret)
1127			goto out;
1128	}
1129	if (x->aalg) {
1130		ret = copy_to_user_auth(x->aalg, skb);
1131		if (ret)
1132			goto out;
1133	}
1134	if (x->ealg) {
1135		ret = copy_to_user_ealg(x->ealg, skb);
1136		if (ret)
1137			goto out;
1138	}
1139	if (x->calg) {
1140		ret = copy_to_user_calg(x->calg, skb);
1141		if (ret)
1142			goto out;
1143	}
1144	if (x->encap) {
1145		ret = copy_to_user_encap(x->encap, skb);
1146		if (ret)
1147			goto out;
1148	}
1149	if (x->tfcpad) {
1150		ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad);
1151		if (ret)
1152			goto out;
1153	}
1154	ret = xfrm_mark_put(skb, &x->mark);
1155	if (ret)
1156		goto out;
1157
1158	ret = xfrm_smark_put(skb, &x->props.smark);
1159	if (ret)
1160		goto out;
1161
1162	if (x->replay_esn)
1163		ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
1164			      xfrm_replay_state_esn_len(x->replay_esn),
1165			      x->replay_esn);
1166	else
1167		ret = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
1168			      &x->replay);
1169	if (ret)
1170		goto out;
1171	if(x->xso.dev)
1172		ret = copy_user_offload(&x->xso, skb);
1173	if (ret)
1174		goto out;
1175	if (x->if_id) {
1176		ret = nla_put_u32(skb, XFRMA_IF_ID, x->if_id);
1177		if (ret)
1178			goto out;
1179	}
1180	if (x->security) {
1181		ret = copy_sec_ctx(x->security, skb);
1182		if (ret)
1183			goto out;
1184	}
1185	if (x->mapping_maxage)
1186		ret = nla_put_u32(skb, XFRMA_MTIMER_THRESH, x->mapping_maxage);
1187out:
1188	return ret;
1189}
1190
1191static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
1192{
1193	struct xfrm_dump_info *sp = ptr;
1194	struct sk_buff *in_skb = sp->in_skb;
1195	struct sk_buff *skb = sp->out_skb;
1196	struct xfrm_translator *xtr;
1197	struct xfrm_usersa_info *p;
1198	struct nlmsghdr *nlh;
1199	int err;
1200
1201	nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
1202			XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
1203	if (nlh == NULL)
1204		return -EMSGSIZE;
1205
1206	p = nlmsg_data(nlh);
1207
1208	err = copy_to_user_state_extra(x, p, skb);
1209	if (err) {
1210		nlmsg_cancel(skb, nlh);
1211		return err;
1212	}
1213	nlmsg_end(skb, nlh);
1214
1215	xtr = xfrm_get_translator();
1216	if (xtr) {
1217		err = xtr->alloc_compat(skb, nlh);
1218
1219		xfrm_put_translator(xtr);
1220		if (err) {
1221			nlmsg_cancel(skb, nlh);
1222			return err;
1223		}
1224	}
1225
1226	return 0;
1227}
1228
1229static int xfrm_dump_sa_done(struct netlink_callback *cb)
1230{
1231	struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
1232	struct sock *sk = cb->skb->sk;
1233	struct net *net = sock_net(sk);
1234
1235	if (cb->args[0])
1236		xfrm_state_walk_done(walk, net);
1237	return 0;
1238}
1239
1240static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
1241{
1242	struct net *net = sock_net(skb->sk);
1243	struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
1244	struct xfrm_dump_info info;
1245
1246	BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
1247		     sizeof(cb->args) - sizeof(cb->args[0]));
1248
1249	info.in_skb = cb->skb;
1250	info.out_skb = skb;
1251	info.nlmsg_seq = cb->nlh->nlmsg_seq;
1252	info.nlmsg_flags = NLM_F_MULTI;
1253
1254	if (!cb->args[0]) {
1255		struct nlattr *attrs[XFRMA_MAX+1];
1256		struct xfrm_address_filter *filter = NULL;
1257		u8 proto = 0;
1258		int err;
1259
1260		err = nlmsg_parse_deprecated(cb->nlh, 0, attrs, XFRMA_MAX,
1261					     xfrma_policy, cb->extack);
1262		if (err < 0)
1263			return err;
1264
1265		if (attrs[XFRMA_ADDRESS_FILTER]) {
1266			filter = kmemdup(nla_data(attrs[XFRMA_ADDRESS_FILTER]),
1267					 sizeof(*filter), GFP_KERNEL);
1268			if (filter == NULL)
1269				return -ENOMEM;
1270
1271			/* see addr_match(), (prefix length >> 5) << 2
1272			 * will be used to compare xfrm_address_t
1273			 */
1274			if (filter->splen > (sizeof(xfrm_address_t) << 3) ||
1275			    filter->dplen > (sizeof(xfrm_address_t) << 3)) {
1276				kfree(filter);
1277				return -EINVAL;
1278			}
1279		}
1280
1281		if (attrs[XFRMA_PROTO])
1282			proto = nla_get_u8(attrs[XFRMA_PROTO]);
1283
1284		xfrm_state_walk_init(walk, proto, filter);
1285		cb->args[0] = 1;
1286	}
1287
1288	(void) xfrm_state_walk(net, walk, dump_one_state, &info);
1289
1290	return skb->len;
1291}
1292
1293static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
1294					  struct xfrm_state *x, u32 seq)
1295{
1296	struct xfrm_dump_info info;
1297	struct sk_buff *skb;
1298	int err;
1299
1300	skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1301	if (!skb)
1302		return ERR_PTR(-ENOMEM);
1303
1304	info.in_skb = in_skb;
1305	info.out_skb = skb;
1306	info.nlmsg_seq = seq;
1307	info.nlmsg_flags = 0;
1308
1309	err = dump_one_state(x, 0, &info);
1310	if (err) {
1311		kfree_skb(skb);
1312		return ERR_PTR(err);
1313	}
1314
1315	return skb;
1316}
1317
1318/* A wrapper for nlmsg_multicast() checking that nlsk is still available.
1319 * Must be called with RCU read lock.
1320 */
1321static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb,
1322				       u32 pid, unsigned int group)
1323{
1324	struct sock *nlsk = rcu_dereference(net->xfrm.nlsk);
1325	struct xfrm_translator *xtr;
1326
1327	if (!nlsk) {
1328		kfree_skb(skb);
1329		return -EPIPE;
1330	}
1331
1332	xtr = xfrm_get_translator();
1333	if (xtr) {
1334		int err = xtr->alloc_compat(skb, nlmsg_hdr(skb));
1335
1336		xfrm_put_translator(xtr);
1337		if (err) {
1338			kfree_skb(skb);
1339			return err;
1340		}
1341	}
1342
1343	return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC);
1344}
1345
1346static inline unsigned int xfrm_spdinfo_msgsize(void)
1347{
1348	return NLMSG_ALIGN(4)
1349	       + nla_total_size(sizeof(struct xfrmu_spdinfo))
1350	       + nla_total_size(sizeof(struct xfrmu_spdhinfo))
1351	       + nla_total_size(sizeof(struct xfrmu_spdhthresh))
1352	       + nla_total_size(sizeof(struct xfrmu_spdhthresh));
1353}
1354
1355static int build_spdinfo(struct sk_buff *skb, struct net *net,
1356			 u32 portid, u32 seq, u32 flags)
1357{
1358	struct xfrmk_spdinfo si;
1359	struct xfrmu_spdinfo spc;
1360	struct xfrmu_spdhinfo sph;
1361	struct xfrmu_spdhthresh spt4, spt6;
1362	struct nlmsghdr *nlh;
1363	int err;
1364	u32 *f;
1365	unsigned lseq;
1366
1367	nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
1368	if (nlh == NULL) /* shouldn't really happen ... */
1369		return -EMSGSIZE;
1370
1371	f = nlmsg_data(nlh);
1372	*f = flags;
1373	xfrm_spd_getinfo(net, &si);
1374	spc.incnt = si.incnt;
1375	spc.outcnt = si.outcnt;
1376	spc.fwdcnt = si.fwdcnt;
1377	spc.inscnt = si.inscnt;
1378	spc.outscnt = si.outscnt;
1379	spc.fwdscnt = si.fwdscnt;
1380	sph.spdhcnt = si.spdhcnt;
1381	sph.spdhmcnt = si.spdhmcnt;
1382
1383	do {
1384		lseq = read_seqbegin(&net->xfrm.policy_hthresh.lock);
1385
1386		spt4.lbits = net->xfrm.policy_hthresh.lbits4;
1387		spt4.rbits = net->xfrm.policy_hthresh.rbits4;
1388		spt6.lbits = net->xfrm.policy_hthresh.lbits6;
1389		spt6.rbits = net->xfrm.policy_hthresh.rbits6;
1390	} while (read_seqretry(&net->xfrm.policy_hthresh.lock, lseq));
1391
1392	err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
1393	if (!err)
1394		err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
1395	if (!err)
1396		err = nla_put(skb, XFRMA_SPD_IPV4_HTHRESH, sizeof(spt4), &spt4);
1397	if (!err)
1398		err = nla_put(skb, XFRMA_SPD_IPV6_HTHRESH, sizeof(spt6), &spt6);
1399	if (err) {
1400		nlmsg_cancel(skb, nlh);
1401		return err;
1402	}
1403
1404	nlmsg_end(skb, nlh);
1405	return 0;
1406}
1407
1408static int xfrm_set_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1409			    struct nlattr **attrs,
1410			    struct netlink_ext_ack *extack)
1411{
1412	struct net *net = sock_net(skb->sk);
1413	struct xfrmu_spdhthresh *thresh4 = NULL;
1414	struct xfrmu_spdhthresh *thresh6 = NULL;
1415
1416	/* selector prefixlen thresholds to hash policies */
1417	if (attrs[XFRMA_SPD_IPV4_HTHRESH]) {
1418		struct nlattr *rta = attrs[XFRMA_SPD_IPV4_HTHRESH];
1419
1420		if (nla_len(rta) < sizeof(*thresh4)) {
1421			NL_SET_ERR_MSG(extack, "Invalid SPD_IPV4_HTHRESH attribute length");
1422			return -EINVAL;
1423		}
1424		thresh4 = nla_data(rta);
1425		if (thresh4->lbits > 32 || thresh4->rbits > 32) {
1426			NL_SET_ERR_MSG(extack, "Invalid hash threshold (must be <= 32 for IPv4)");
1427			return -EINVAL;
1428		}
1429	}
1430	if (attrs[XFRMA_SPD_IPV6_HTHRESH]) {
1431		struct nlattr *rta = attrs[XFRMA_SPD_IPV6_HTHRESH];
1432
1433		if (nla_len(rta) < sizeof(*thresh6)) {
1434			NL_SET_ERR_MSG(extack, "Invalid SPD_IPV6_HTHRESH attribute length");
1435			return -EINVAL;
1436		}
1437		thresh6 = nla_data(rta);
1438		if (thresh6->lbits > 128 || thresh6->rbits > 128) {
1439			NL_SET_ERR_MSG(extack, "Invalid hash threshold (must be <= 128 for IPv6)");
1440			return -EINVAL;
1441		}
1442	}
1443
1444	if (thresh4 || thresh6) {
1445		write_seqlock(&net->xfrm.policy_hthresh.lock);
1446		if (thresh4) {
1447			net->xfrm.policy_hthresh.lbits4 = thresh4->lbits;
1448			net->xfrm.policy_hthresh.rbits4 = thresh4->rbits;
1449		}
1450		if (thresh6) {
1451			net->xfrm.policy_hthresh.lbits6 = thresh6->lbits;
1452			net->xfrm.policy_hthresh.rbits6 = thresh6->rbits;
1453		}
1454		write_sequnlock(&net->xfrm.policy_hthresh.lock);
1455
1456		xfrm_policy_hash_rebuild(net);
1457	}
1458
1459	return 0;
1460}
1461
1462static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1463			    struct nlattr **attrs,
1464			    struct netlink_ext_ack *extack)
1465{
1466	struct net *net = sock_net(skb->sk);
1467	struct sk_buff *r_skb;
1468	u32 *flags = nlmsg_data(nlh);
1469	u32 sportid = NETLINK_CB(skb).portid;
1470	u32 seq = nlh->nlmsg_seq;
1471	int err;
1472
1473	r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
1474	if (r_skb == NULL)
1475		return -ENOMEM;
1476
1477	err = build_spdinfo(r_skb, net, sportid, seq, *flags);
1478	BUG_ON(err < 0);
1479
1480	return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1481}
1482
1483static inline unsigned int xfrm_sadinfo_msgsize(void)
1484{
1485	return NLMSG_ALIGN(4)
1486	       + nla_total_size(sizeof(struct xfrmu_sadhinfo))
1487	       + nla_total_size(4); /* XFRMA_SAD_CNT */
1488}
1489
1490static int build_sadinfo(struct sk_buff *skb, struct net *net,
1491			 u32 portid, u32 seq, u32 flags)
1492{
1493	struct xfrmk_sadinfo si;
1494	struct xfrmu_sadhinfo sh;
1495	struct nlmsghdr *nlh;
1496	int err;
1497	u32 *f;
1498
1499	nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
1500	if (nlh == NULL) /* shouldn't really happen ... */
1501		return -EMSGSIZE;
1502
1503	f = nlmsg_data(nlh);
1504	*f = flags;
1505	xfrm_sad_getinfo(net, &si);
1506
1507	sh.sadhmcnt = si.sadhmcnt;
1508	sh.sadhcnt = si.sadhcnt;
1509
1510	err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt);
1511	if (!err)
1512		err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
1513	if (err) {
1514		nlmsg_cancel(skb, nlh);
1515		return err;
1516	}
1517
1518	nlmsg_end(skb, nlh);
1519	return 0;
1520}
1521
1522static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1523			    struct nlattr **attrs,
1524			    struct netlink_ext_ack *extack)
1525{
1526	struct net *net = sock_net(skb->sk);
1527	struct sk_buff *r_skb;
1528	u32 *flags = nlmsg_data(nlh);
1529	u32 sportid = NETLINK_CB(skb).portid;
1530	u32 seq = nlh->nlmsg_seq;
1531	int err;
1532
1533	r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
1534	if (r_skb == NULL)
1535		return -ENOMEM;
1536
1537	err = build_sadinfo(r_skb, net, sportid, seq, *flags);
1538	BUG_ON(err < 0);
1539
1540	return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1541}
1542
1543static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1544		       struct nlattr **attrs, struct netlink_ext_ack *extack)
1545{
1546	struct net *net = sock_net(skb->sk);
1547	struct xfrm_usersa_id *p = nlmsg_data(nlh);
1548	struct xfrm_state *x;
1549	struct sk_buff *resp_skb;
1550	int err = -ESRCH;
1551
1552	x = xfrm_user_state_lookup(net, p, attrs, &err);
1553	if (x == NULL)
1554		goto out_noput;
1555
1556	resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1557	if (IS_ERR(resp_skb)) {
1558		err = PTR_ERR(resp_skb);
1559	} else {
1560		err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1561	}
1562	xfrm_state_put(x);
1563out_noput:
1564	return err;
1565}
1566
1567static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
1568			      struct nlattr **attrs,
1569			      struct netlink_ext_ack *extack)
1570{
1571	struct net *net = sock_net(skb->sk);
1572	struct xfrm_state *x;
1573	struct xfrm_userspi_info *p;
1574	struct xfrm_translator *xtr;
1575	struct sk_buff *resp_skb;
1576	xfrm_address_t *daddr;
1577	int family;
1578	int err;
1579	u32 mark;
1580	struct xfrm_mark m;
1581	u32 if_id = 0;
1582
1583	p = nlmsg_data(nlh);
1584	err = verify_spi_info(p->info.id.proto, p->min, p->max, extack);
1585	if (err)
1586		goto out_noput;
1587
1588	family = p->info.family;
1589	daddr = &p->info.id.daddr;
1590
1591	x = NULL;
1592
1593	mark = xfrm_mark_get(attrs, &m);
1594
1595	if (attrs[XFRMA_IF_ID])
1596		if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
1597
1598	if (p->info.seq) {
1599		x = xfrm_find_acq_byseq(net, mark, p->info.seq);
1600		if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) {
1601			xfrm_state_put(x);
1602			x = NULL;
1603		}
1604	}
1605
1606	if (!x)
1607		x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1608				  if_id, p->info.id.proto, daddr,
1609				  &p->info.saddr, 1,
1610				  family);
1611	err = -ENOENT;
1612	if (!x) {
1613		NL_SET_ERR_MSG(extack, "Target ACQUIRE not found");
1614		goto out_noput;
1615	}
1616
1617	err = xfrm_alloc_spi(x, p->min, p->max, extack);
1618	if (err)
1619		goto out;
1620
1621	resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1622	if (IS_ERR(resp_skb)) {
1623		err = PTR_ERR(resp_skb);
1624		goto out;
1625	}
1626
1627	xtr = xfrm_get_translator();
1628	if (xtr) {
1629		err = xtr->alloc_compat(skb, nlmsg_hdr(skb));
1630
1631		xfrm_put_translator(xtr);
1632		if (err) {
1633			kfree_skb(resp_skb);
1634			goto out;
1635		}
1636	}
1637
1638	err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1639
1640out:
1641	xfrm_state_put(x);
1642out_noput:
1643	return err;
1644}
1645
1646static int verify_policy_dir(u8 dir, struct netlink_ext_ack *extack)
1647{
1648	switch (dir) {
1649	case XFRM_POLICY_IN:
1650	case XFRM_POLICY_OUT:
1651	case XFRM_POLICY_FWD:
1652		break;
1653
1654	default:
1655		NL_SET_ERR_MSG(extack, "Invalid policy direction");
1656		return -EINVAL;
1657	}
1658
1659	return 0;
1660}
1661
1662static int verify_policy_type(u8 type, struct netlink_ext_ack *extack)
1663{
1664	switch (type) {
1665	case XFRM_POLICY_TYPE_MAIN:
1666#ifdef CONFIG_XFRM_SUB_POLICY
1667	case XFRM_POLICY_TYPE_SUB:
1668#endif
1669		break;
1670
1671	default:
1672		NL_SET_ERR_MSG(extack, "Invalid policy type");
1673		return -EINVAL;
1674	}
1675
1676	return 0;
1677}
1678
1679static int verify_newpolicy_info(struct xfrm_userpolicy_info *p,
1680				 struct netlink_ext_ack *extack)
1681{
1682	int ret;
1683
1684	switch (p->share) {
1685	case XFRM_SHARE_ANY:
1686	case XFRM_SHARE_SESSION:
1687	case XFRM_SHARE_USER:
1688	case XFRM_SHARE_UNIQUE:
1689		break;
1690
1691	default:
1692		NL_SET_ERR_MSG(extack, "Invalid policy share");
1693		return -EINVAL;
1694	}
1695
1696	switch (p->action) {
1697	case XFRM_POLICY_ALLOW:
1698	case XFRM_POLICY_BLOCK:
1699		break;
1700
1701	default:
1702		NL_SET_ERR_MSG(extack, "Invalid policy action");
1703		return -EINVAL;
1704	}
1705
1706	switch (p->sel.family) {
1707	case AF_INET:
1708		if (p->sel.prefixlen_d > 32 || p->sel.prefixlen_s > 32) {
1709			NL_SET_ERR_MSG(extack, "Invalid prefix length in selector (must be <= 32 for IPv4)");
1710			return -EINVAL;
1711		}
1712
1713		break;
1714
1715	case AF_INET6:
1716#if IS_ENABLED(CONFIG_IPV6)
1717		if (p->sel.prefixlen_d > 128 || p->sel.prefixlen_s > 128) {
1718			NL_SET_ERR_MSG(extack, "Invalid prefix length in selector (must be <= 128 for IPv6)");
1719			return -EINVAL;
1720		}
1721
1722		break;
1723#else
1724		NL_SET_ERR_MSG(extack, "IPv6 support disabled");
1725		return  -EAFNOSUPPORT;
1726#endif
1727
1728	default:
1729		NL_SET_ERR_MSG(extack, "Invalid selector family");
1730		return -EINVAL;
1731	}
1732
1733	ret = verify_policy_dir(p->dir, extack);
1734	if (ret)
1735		return ret;
1736	if (p->index && (xfrm_policy_id2dir(p->index) != p->dir)) {
1737		NL_SET_ERR_MSG(extack, "Policy index doesn't match direction");
1738		return -EINVAL;
1739	}
1740
1741	return 0;
1742}
1743
1744static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
1745{
1746	struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1747	struct xfrm_user_sec_ctx *uctx;
1748
1749	if (!rt)
1750		return 0;
1751
1752	uctx = nla_data(rt);
1753	return security_xfrm_policy_alloc(&pol->security, uctx, GFP_KERNEL);
1754}
1755
1756static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1757			   int nr)
1758{
1759	int i;
1760
1761	xp->xfrm_nr = nr;
1762	for (i = 0; i < nr; i++, ut++) {
1763		struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1764
1765		memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1766		memcpy(&t->saddr, &ut->saddr,
1767		       sizeof(xfrm_address_t));
1768		t->reqid = ut->reqid;
1769		t->mode = ut->mode;
1770		t->share = ut->share;
1771		t->optional = ut->optional;
1772		t->aalgos = ut->aalgos;
1773		t->ealgos = ut->ealgos;
1774		t->calgos = ut->calgos;
1775		/* If all masks are ~0, then we allow all algorithms. */
1776		t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
1777		t->encap_family = ut->family;
1778	}
1779}
1780
1781static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family,
1782			 int dir, struct netlink_ext_ack *extack)
1783{
1784	u16 prev_family;
1785	int i;
1786
1787	if (nr > XFRM_MAX_DEPTH) {
1788		NL_SET_ERR_MSG(extack, "Template count must be <= XFRM_MAX_DEPTH (" __stringify(XFRM_MAX_DEPTH) ")");
1789		return -EINVAL;
1790	}
1791
1792	prev_family = family;
1793
1794	for (i = 0; i < nr; i++) {
1795		/* We never validated the ut->family value, so many
1796		 * applications simply leave it at zero.  The check was
1797		 * never made and ut->family was ignored because all
1798		 * templates could be assumed to have the same family as
1799		 * the policy itself.  Now that we will have ipv4-in-ipv6
1800		 * and ipv6-in-ipv4 tunnels, this is no longer true.
1801		 */
1802		if (!ut[i].family)
1803			ut[i].family = family;
1804
1805		switch (ut[i].mode) {
1806		case XFRM_MODE_TUNNEL:
1807		case XFRM_MODE_BEET:
1808			if (ut[i].optional && dir == XFRM_POLICY_OUT) {
1809				NL_SET_ERR_MSG(extack, "Mode in optional template not allowed in outbound policy");
1810				return -EINVAL;
1811			}
1812			break;
1813		default:
1814			if (ut[i].family != prev_family) {
1815				NL_SET_ERR_MSG(extack, "Mode in template doesn't support a family change");
1816				return -EINVAL;
1817			}
1818			break;
1819		}
1820		if (ut[i].mode >= XFRM_MODE_MAX) {
1821			NL_SET_ERR_MSG(extack, "Mode in template must be < XFRM_MODE_MAX (" __stringify(XFRM_MODE_MAX) ")");
1822			return -EINVAL;
1823		}
1824
1825		prev_family = ut[i].family;
1826
1827		switch (ut[i].family) {
1828		case AF_INET:
1829			break;
1830#if IS_ENABLED(CONFIG_IPV6)
1831		case AF_INET6:
1832			break;
1833#endif
1834		default:
1835			NL_SET_ERR_MSG(extack, "Invalid family in template");
1836			return -EINVAL;
1837		}
1838
1839		if (!xfrm_id_proto_valid(ut[i].id.proto)) {
1840			NL_SET_ERR_MSG(extack, "Invalid XFRM protocol in template");
1841			return -EINVAL;
1842		}
1843	}
1844
1845	return 0;
1846}
1847
1848static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs,
1849			       int dir, struct netlink_ext_ack *extack)
1850{
1851	struct nlattr *rt = attrs[XFRMA_TMPL];
1852
1853	if (!rt) {
1854		pol->xfrm_nr = 0;
1855	} else {
1856		struct xfrm_user_tmpl *utmpl = nla_data(rt);
1857		int nr = nla_len(rt) / sizeof(*utmpl);
1858		int err;
1859
1860		err = validate_tmpl(nr, utmpl, pol->family, dir, extack);
1861		if (err)
1862			return err;
1863
1864		copy_templates(pol, utmpl, nr);
1865	}
1866	return 0;
1867}
1868
1869static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs,
1870				      struct netlink_ext_ack *extack)
1871{
1872	struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
1873	struct xfrm_userpolicy_type *upt;
1874	u8 type = XFRM_POLICY_TYPE_MAIN;
1875	int err;
1876
1877	if (rt) {
1878		upt = nla_data(rt);
1879		type = upt->type;
1880	}
1881
1882	err = verify_policy_type(type, extack);
1883	if (err)
1884		return err;
1885
1886	*tp = type;
1887	return 0;
1888}
1889
1890static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1891{
1892	xp->priority = p->priority;
1893	xp->index = p->index;
1894	memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1895	memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1896	xp->action = p->action;
1897	xp->flags = p->flags;
1898	xp->family = p->sel.family;
1899	/* XXX xp->share = p->share; */
1900}
1901
1902static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1903{
1904	memset(p, 0, sizeof(*p));
1905	memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1906	memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1907	memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1908	p->priority = xp->priority;
1909	p->index = xp->index;
1910	p->sel.family = xp->family;
1911	p->dir = dir;
1912	p->action = xp->action;
1913	p->flags = xp->flags;
1914	p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1915}
1916
1917static struct xfrm_policy *xfrm_policy_construct(struct net *net,
1918						 struct xfrm_userpolicy_info *p,
1919						 struct nlattr **attrs,
1920						 int *errp,
1921						 struct netlink_ext_ack *extack)
1922{
1923	struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
1924	int err;
1925
1926	if (!xp) {
1927		*errp = -ENOMEM;
1928		return NULL;
1929	}
1930
1931	copy_from_user_policy(xp, p);
1932
1933	err = copy_from_user_policy_type(&xp->type, attrs, extack);
1934	if (err)
1935		goto error;
1936
1937	if (!(err = copy_from_user_tmpl(xp, attrs, p->dir, extack)))
1938		err = copy_from_user_sec_ctx(xp, attrs);
1939	if (err)
1940		goto error;
1941
1942	xfrm_mark_get(attrs, &xp->mark);
1943
1944	if (attrs[XFRMA_IF_ID])
1945		xp->if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
1946
1947	/* configure the hardware if offload is requested */
1948	if (attrs[XFRMA_OFFLOAD_DEV]) {
1949		err = xfrm_dev_policy_add(net, xp,
1950					  nla_data(attrs[XFRMA_OFFLOAD_DEV]),
1951					  p->dir, extack);
1952		if (err)
1953			goto error;
1954	}
1955
1956	return xp;
1957 error:
1958	*errp = err;
1959	xp->walk.dead = 1;
1960	xfrm_policy_destroy(xp);
1961	return NULL;
1962}
1963
1964static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1965			   struct nlattr **attrs,
1966			   struct netlink_ext_ack *extack)
1967{
1968	struct net *net = sock_net(skb->sk);
1969	struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1970	struct xfrm_policy *xp;
1971	struct km_event c;
1972	int err;
1973	int excl;
1974
1975	err = verify_newpolicy_info(p, extack);
1976	if (err)
1977		return err;
1978	err = verify_sec_ctx_len(attrs, extack);
1979	if (err)
1980		return err;
1981
1982	xp = xfrm_policy_construct(net, p, attrs, &err, extack);
1983	if (!xp)
1984		return err;
1985
1986	/* shouldn't excl be based on nlh flags??
1987	 * Aha! this is anti-netlink really i.e  more pfkey derived
1988	 * in netlink excl is a flag and you wouldn't need
1989	 * a type XFRM_MSG_UPDPOLICY - JHS */
1990	excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1991	err = xfrm_policy_insert(p->dir, xp, excl);
1992	xfrm_audit_policy_add(xp, err ? 0 : 1, true);
1993
1994	if (err) {
1995		xfrm_dev_policy_delete(xp);
1996		xfrm_dev_policy_free(xp);
1997		security_xfrm_policy_free(xp->security);
1998		kfree(xp);
1999		return err;
2000	}
2001
2002	c.event = nlh->nlmsg_type;
2003	c.seq = nlh->nlmsg_seq;
2004	c.portid = nlh->nlmsg_pid;
2005	km_policy_notify(xp, p->dir, &c);
2006
2007	xfrm_pol_put(xp);
2008
2009	return 0;
2010}
2011
2012static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
2013{
2014	struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
2015	int i;
2016
2017	if (xp->xfrm_nr == 0)
2018		return 0;
2019
2020	if (xp->xfrm_nr > XFRM_MAX_DEPTH)
2021		return -ENOBUFS;
2022
2023	for (i = 0; i < xp->xfrm_nr; i++) {
2024		struct xfrm_user_tmpl *up = &vec[i];
2025		struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
2026
2027		memset(up, 0, sizeof(*up));
2028		memcpy(&up->id, &kp->id, sizeof(up->id));
2029		up->family = kp->encap_family;
2030		memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
2031		up->reqid = kp->reqid;
2032		up->mode = kp->mode;
2033		up->share = kp->share;
2034		up->optional = kp->optional;
2035		up->aalgos = kp->aalgos;
2036		up->ealgos = kp->ealgos;
2037		up->calgos = kp->calgos;
2038	}
2039
2040	return nla_put(skb, XFRMA_TMPL,
2041		       sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
2042}
2043
2044static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
2045{
2046	if (x->security) {
2047		return copy_sec_ctx(x->security, skb);
2048	}
2049	return 0;
2050}
2051
2052static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
2053{
2054	if (xp->security)
2055		return copy_sec_ctx(xp->security, skb);
2056	return 0;
2057}
2058static inline unsigned int userpolicy_type_attrsize(void)
2059{
2060#ifdef CONFIG_XFRM_SUB_POLICY
2061	return nla_total_size(sizeof(struct xfrm_userpolicy_type));
2062#else
2063	return 0;
2064#endif
2065}
2066
2067#ifdef CONFIG_XFRM_SUB_POLICY
2068static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
2069{
2070	struct xfrm_userpolicy_type upt;
2071
2072	/* Sadly there are two holes in struct xfrm_userpolicy_type */
2073	memset(&upt, 0, sizeof(upt));
2074	upt.type = type;
2075
2076	return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
2077}
2078
2079#else
2080static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
2081{
2082	return 0;
2083}
2084#endif
2085
2086static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
2087{
2088	struct xfrm_dump_info *sp = ptr;
2089	struct xfrm_userpolicy_info *p;
2090	struct sk_buff *in_skb = sp->in_skb;
2091	struct sk_buff *skb = sp->out_skb;
2092	struct xfrm_translator *xtr;
2093	struct nlmsghdr *nlh;
2094	int err;
2095
2096	nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
2097			XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
2098	if (nlh == NULL)
2099		return -EMSGSIZE;
2100
2101	p = nlmsg_data(nlh);
2102	copy_to_user_policy(xp, p, dir);
2103	err = copy_to_user_tmpl(xp, skb);
2104	if (!err)
2105		err = copy_to_user_sec_ctx(xp, skb);
2106	if (!err)
2107		err = copy_to_user_policy_type(xp->type, skb);
2108	if (!err)
2109		err = xfrm_mark_put(skb, &xp->mark);
2110	if (!err)
2111		err = xfrm_if_id_put(skb, xp->if_id);
2112	if (!err && xp->xdo.dev)
2113		err = copy_user_offload(&xp->xdo, skb);
2114	if (err) {
2115		nlmsg_cancel(skb, nlh);
2116		return err;
2117	}
2118	nlmsg_end(skb, nlh);
2119
2120	xtr = xfrm_get_translator();
2121	if (xtr) {
2122		err = xtr->alloc_compat(skb, nlh);
2123
2124		xfrm_put_translator(xtr);
2125		if (err) {
2126			nlmsg_cancel(skb, nlh);
2127			return err;
2128		}
2129	}
2130
2131	return 0;
2132}
2133
2134static int xfrm_dump_policy_done(struct netlink_callback *cb)
2135{
2136	struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
2137	struct net *net = sock_net(cb->skb->sk);
2138
2139	xfrm_policy_walk_done(walk, net);
2140	return 0;
2141}
2142
2143static int xfrm_dump_policy_start(struct netlink_callback *cb)
2144{
2145	struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
2146
2147	BUILD_BUG_ON(sizeof(*walk) > sizeof(cb->args));
2148
2149	xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
2150	return 0;
2151}
2152
2153static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
2154{
2155	struct net *net = sock_net(skb->sk);
2156	struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
2157	struct xfrm_dump_info info;
2158
2159	info.in_skb = cb->skb;
2160	info.out_skb = skb;
2161	info.nlmsg_seq = cb->nlh->nlmsg_seq;
2162	info.nlmsg_flags = NLM_F_MULTI;
2163
2164	(void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
2165
2166	return skb->len;
2167}
2168
2169static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
2170					  struct xfrm_policy *xp,
2171					  int dir, u32 seq)
2172{
2173	struct xfrm_dump_info info;
2174	struct sk_buff *skb;
2175	int err;
2176
2177	skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2178	if (!skb)
2179		return ERR_PTR(-ENOMEM);
2180
2181	info.in_skb = in_skb;
2182	info.out_skb = skb;
2183	info.nlmsg_seq = seq;
2184	info.nlmsg_flags = 0;
2185
2186	err = dump_one_policy(xp, dir, 0, &info);
2187	if (err) {
2188		kfree_skb(skb);
2189		return ERR_PTR(err);
2190	}
2191
2192	return skb;
2193}
2194
2195static int xfrm_notify_userpolicy(struct net *net)
2196{
2197	struct xfrm_userpolicy_default *up;
2198	int len = NLMSG_ALIGN(sizeof(*up));
2199	struct nlmsghdr *nlh;
2200	struct sk_buff *skb;
2201	int err;
2202
2203	skb = nlmsg_new(len, GFP_ATOMIC);
2204	if (skb == NULL)
2205		return -ENOMEM;
2206
2207	nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_GETDEFAULT, sizeof(*up), 0);
2208	if (nlh == NULL) {
2209		kfree_skb(skb);
2210		return -EMSGSIZE;
2211	}
2212
2213	up = nlmsg_data(nlh);
2214	up->in = net->xfrm.policy_default[XFRM_POLICY_IN];
2215	up->fwd = net->xfrm.policy_default[XFRM_POLICY_FWD];
2216	up->out = net->xfrm.policy_default[XFRM_POLICY_OUT];
2217
2218	nlmsg_end(skb, nlh);
2219
2220	rcu_read_lock();
2221	err = xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
2222	rcu_read_unlock();
2223
2224	return err;
2225}
2226
2227static bool xfrm_userpolicy_is_valid(__u8 policy)
2228{
2229	return policy == XFRM_USERPOLICY_BLOCK ||
2230	       policy == XFRM_USERPOLICY_ACCEPT;
2231}
2232
2233static int xfrm_set_default(struct sk_buff *skb, struct nlmsghdr *nlh,
2234			    struct nlattr **attrs, struct netlink_ext_ack *extack)
2235{
2236	struct net *net = sock_net(skb->sk);
2237	struct xfrm_userpolicy_default *up = nlmsg_data(nlh);
2238
2239	if (xfrm_userpolicy_is_valid(up->in))
2240		net->xfrm.policy_default[XFRM_POLICY_IN] = up->in;
2241
2242	if (xfrm_userpolicy_is_valid(up->fwd))
2243		net->xfrm.policy_default[XFRM_POLICY_FWD] = up->fwd;
2244
2245	if (xfrm_userpolicy_is_valid(up->out))
2246		net->xfrm.policy_default[XFRM_POLICY_OUT] = up->out;
2247
2248	rt_genid_bump_all(net);
2249
2250	xfrm_notify_userpolicy(net);
2251	return 0;
2252}
2253
2254static int xfrm_get_default(struct sk_buff *skb, struct nlmsghdr *nlh,
2255			    struct nlattr **attrs, struct netlink_ext_ack *extack)
2256{
2257	struct sk_buff *r_skb;
2258	struct nlmsghdr *r_nlh;
2259	struct net *net = sock_net(skb->sk);
2260	struct xfrm_userpolicy_default *r_up;
2261	int len = NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_default));
2262	u32 portid = NETLINK_CB(skb).portid;
2263	u32 seq = nlh->nlmsg_seq;
2264
2265	r_skb = nlmsg_new(len, GFP_ATOMIC);
2266	if (!r_skb)
2267		return -ENOMEM;
2268
2269	r_nlh = nlmsg_put(r_skb, portid, seq, XFRM_MSG_GETDEFAULT, sizeof(*r_up), 0);
2270	if (!r_nlh) {
2271		kfree_skb(r_skb);
2272		return -EMSGSIZE;
2273	}
2274
2275	r_up = nlmsg_data(r_nlh);
2276	r_up->in = net->xfrm.policy_default[XFRM_POLICY_IN];
2277	r_up->fwd = net->xfrm.policy_default[XFRM_POLICY_FWD];
2278	r_up->out = net->xfrm.policy_default[XFRM_POLICY_OUT];
2279	nlmsg_end(r_skb, r_nlh);
2280
2281	return nlmsg_unicast(net->xfrm.nlsk, r_skb, portid);
2282}
2283
2284static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
2285			   struct nlattr **attrs,
2286			   struct netlink_ext_ack *extack)
2287{
2288	struct net *net = sock_net(skb->sk);
2289	struct xfrm_policy *xp;
2290	struct xfrm_userpolicy_id *p;
2291	u8 type = XFRM_POLICY_TYPE_MAIN;
2292	int err;
2293	struct km_event c;
2294	int delete;
2295	struct xfrm_mark m;
2296	u32 if_id = 0;
2297
2298	p = nlmsg_data(nlh);
2299	delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
2300
2301	err = copy_from_user_policy_type(&type, attrs, extack);
2302	if (err)
2303		return err;
2304
2305	err = verify_policy_dir(p->dir, extack);
2306	if (err)
2307		return err;
2308
2309	if (attrs[XFRMA_IF_ID])
2310		if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
2311
2312	xfrm_mark_get(attrs, &m);
2313
2314	if (p->index)
2315		xp = xfrm_policy_byid(net, &m, if_id, type, p->dir,
2316				      p->index, delete, &err);
2317	else {
2318		struct nlattr *rt = attrs[XFRMA_SEC_CTX];
2319		struct xfrm_sec_ctx *ctx;
2320
2321		err = verify_sec_ctx_len(attrs, extack);
2322		if (err)
2323			return err;
2324
2325		ctx = NULL;
2326		if (rt) {
2327			struct xfrm_user_sec_ctx *uctx = nla_data(rt);
2328
2329			err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
2330			if (err)
2331				return err;
2332		}
2333		xp = xfrm_policy_bysel_ctx(net, &m, if_id, type, p->dir,
2334					   &p->sel, ctx, delete, &err);
2335		security_xfrm_policy_free(ctx);
2336	}
2337	if (xp == NULL)
2338		return -ENOENT;
2339
2340	if (!delete) {
2341		struct sk_buff *resp_skb;
2342
2343		resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
2344		if (IS_ERR(resp_skb)) {
2345			err = PTR_ERR(resp_skb);
2346		} else {
2347			err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
2348					    NETLINK_CB(skb).portid);
2349		}
2350	} else {
2351		xfrm_dev_policy_delete(xp);
2352		xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2353
2354		if (err != 0)
2355			goto out;
2356
2357		c.data.byid = p->index;
2358		c.event = nlh->nlmsg_type;
2359		c.seq = nlh->nlmsg_seq;
2360		c.portid = nlh->nlmsg_pid;
2361		km_policy_notify(xp, p->dir, &c);
2362	}
2363
2364out:
2365	xfrm_pol_put(xp);
2366	return err;
2367}
2368
2369static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
2370			 struct nlattr **attrs,
2371			 struct netlink_ext_ack *extack)
2372{
2373	struct net *net = sock_net(skb->sk);
2374	struct km_event c;
2375	struct xfrm_usersa_flush *p = nlmsg_data(nlh);
2376	int err;
2377
2378	err = xfrm_state_flush(net, p->proto, true, false);
2379	if (err) {
2380		if (err == -ESRCH) /* empty table */
2381			return 0;
2382		return err;
2383	}
2384	c.data.proto = p->proto;
2385	c.event = nlh->nlmsg_type;
2386	c.seq = nlh->nlmsg_seq;
2387	c.portid = nlh->nlmsg_pid;
2388	c.net = net;
2389	km_state_notify(NULL, &c);
2390
2391	return 0;
2392}
2393
2394static inline unsigned int xfrm_aevent_msgsize(struct xfrm_state *x)
2395{
2396	unsigned int replay_size = x->replay_esn ?
2397			      xfrm_replay_state_esn_len(x->replay_esn) :
2398			      sizeof(struct xfrm_replay_state);
2399
2400	return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
2401	       + nla_total_size(replay_size)
2402	       + nla_total_size_64bit(sizeof(struct xfrm_lifetime_cur))
2403	       + nla_total_size(sizeof(struct xfrm_mark))
2404	       + nla_total_size(4) /* XFRM_AE_RTHR */
2405	       + nla_total_size(4); /* XFRM_AE_ETHR */
2406}
2407
2408static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
2409{
2410	struct xfrm_aevent_id *id;
2411	struct nlmsghdr *nlh;
2412	int err;
2413
2414	nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
2415	if (nlh == NULL)
2416		return -EMSGSIZE;
2417
2418	id = nlmsg_data(nlh);
2419	memset(&id->sa_id, 0, sizeof(id->sa_id));
2420	memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr));
2421	id->sa_id.spi = x->id.spi;
2422	id->sa_id.family = x->props.family;
2423	id->sa_id.proto = x->id.proto;
2424	memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr));
2425	id->reqid = x->props.reqid;
2426	id->flags = c->data.aevent;
2427
2428	if (x->replay_esn) {
2429		err = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
2430			      xfrm_replay_state_esn_len(x->replay_esn),
2431			      x->replay_esn);
2432	} else {
2433		err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
2434			      &x->replay);
2435	}
2436	if (err)
2437		goto out_cancel;
2438	err = nla_put_64bit(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft,
2439			    XFRMA_PAD);
2440	if (err)
2441		goto out_cancel;
2442
2443	if (id->flags & XFRM_AE_RTHR) {
2444		err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
2445		if (err)
2446			goto out_cancel;
2447	}
2448	if (id->flags & XFRM_AE_ETHR) {
2449		err = nla_put_u32(skb, XFRMA_ETIMER_THRESH,
2450				  x->replay_maxage * 10 / HZ);
2451		if (err)
2452			goto out_cancel;
2453	}
2454	err = xfrm_mark_put(skb, &x->mark);
2455	if (err)
2456		goto out_cancel;
2457
2458	err = xfrm_if_id_put(skb, x->if_id);
2459	if (err)
2460		goto out_cancel;
2461
2462	nlmsg_end(skb, nlh);
2463	return 0;
2464
2465out_cancel:
2466	nlmsg_cancel(skb, nlh);
2467	return err;
2468}
2469
2470static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
2471		       struct nlattr **attrs, struct netlink_ext_ack *extack)
2472{
2473	struct net *net = sock_net(skb->sk);
2474	struct xfrm_state *x;
2475	struct sk_buff *r_skb;
2476	int err;
2477	struct km_event c;
2478	u32 mark;
2479	struct xfrm_mark m;
2480	struct xfrm_aevent_id *p = nlmsg_data(nlh);
2481	struct xfrm_usersa_id *id = &p->sa_id;
2482
2483	mark = xfrm_mark_get(attrs, &m);
2484
2485	x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
2486	if (x == NULL)
2487		return -ESRCH;
2488
2489	r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2490	if (r_skb == NULL) {
2491		xfrm_state_put(x);
2492		return -ENOMEM;
2493	}
2494
2495	/*
2496	 * XXX: is this lock really needed - none of the other
2497	 * gets lock (the concern is things getting updated
2498	 * while we are still reading) - jhs
2499	*/
2500	spin_lock_bh(&x->lock);
2501	c.data.aevent = p->flags;
2502	c.seq = nlh->nlmsg_seq;
2503	c.portid = nlh->nlmsg_pid;
2504
2505	err = build_aevent(r_skb, x, &c);
2506	BUG_ON(err < 0);
2507
2508	err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid);
2509	spin_unlock_bh(&x->lock);
2510	xfrm_state_put(x);
2511	return err;
2512}
2513
2514static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
2515		       struct nlattr **attrs, struct netlink_ext_ack *extack)
2516{
2517	struct net *net = sock_net(skb->sk);
2518	struct xfrm_state *x;
2519	struct km_event c;
2520	int err = -EINVAL;
2521	u32 mark = 0;
2522	struct xfrm_mark m;
2523	struct xfrm_aevent_id *p = nlmsg_data(nlh);
2524	struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
2525	struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
2526	struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
2527	struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
2528	struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
2529
2530	if (!lt && !rp && !re && !et && !rt) {
2531		NL_SET_ERR_MSG(extack, "Missing required attribute for AE");
2532		return err;
2533	}
2534
2535	/* pedantic mode - thou shalt sayeth replaceth */
2536	if (!(nlh->nlmsg_flags & NLM_F_REPLACE)) {
2537		NL_SET_ERR_MSG(extack, "NLM_F_REPLACE flag is required");
2538		return err;
2539	}
2540
2541	mark = xfrm_mark_get(attrs, &m);
2542
2543	x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
2544	if (x == NULL)
2545		return -ESRCH;
2546
2547	if (x->km.state != XFRM_STATE_VALID) {
2548		NL_SET_ERR_MSG(extack, "SA must be in VALID state");
2549		goto out;
2550	}
2551
2552	err = xfrm_replay_verify_len(x->replay_esn, re, extack);
2553	if (err)
2554		goto out;
2555
2556	spin_lock_bh(&x->lock);
2557	xfrm_update_ae_params(x, attrs, 1);
2558	spin_unlock_bh(&x->lock);
2559
2560	c.event = nlh->nlmsg_type;
2561	c.seq = nlh->nlmsg_seq;
2562	c.portid = nlh->nlmsg_pid;
2563	c.data.aevent = XFRM_AE_CU;
2564	km_state_notify(x, &c);
2565	err = 0;
2566out:
2567	xfrm_state_put(x);
2568	return err;
2569}
2570
2571static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
2572			     struct nlattr **attrs,
2573			     struct netlink_ext_ack *extack)
2574{
2575	struct net *net = sock_net(skb->sk);
2576	struct km_event c;
2577	u8 type = XFRM_POLICY_TYPE_MAIN;
2578	int err;
2579
2580	err = copy_from_user_policy_type(&type, attrs, extack);
2581	if (err)
2582		return err;
2583
2584	err = xfrm_policy_flush(net, type, true);
2585	if (err) {
2586		if (err == -ESRCH) /* empty table */
2587			return 0;
2588		return err;
2589	}
2590
2591	c.data.type = type;
2592	c.event = nlh->nlmsg_type;
2593	c.seq = nlh->nlmsg_seq;
2594	c.portid = nlh->nlmsg_pid;
2595	c.net = net;
2596	km_policy_notify(NULL, 0, &c);
2597	return 0;
2598}
2599
2600static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2601			       struct nlattr **attrs,
2602			       struct netlink_ext_ack *extack)
2603{
2604	struct net *net = sock_net(skb->sk);
2605	struct xfrm_policy *xp;
2606	struct xfrm_user_polexpire *up = nlmsg_data(nlh);
2607	struct xfrm_userpolicy_info *p = &up->pol;
2608	u8 type = XFRM_POLICY_TYPE_MAIN;
2609	int err = -ENOENT;
2610	struct xfrm_mark m;
2611	u32 if_id = 0;
2612
2613	err = copy_from_user_policy_type(&type, attrs, extack);
2614	if (err)
2615		return err;
2616
2617	err = verify_policy_dir(p->dir, extack);
2618	if (err)
2619		return err;
2620
2621	if (attrs[XFRMA_IF_ID])
2622		if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
2623
2624	xfrm_mark_get(attrs, &m);
2625
2626	if (p->index)
2627		xp = xfrm_policy_byid(net, &m, if_id, type, p->dir, p->index,
2628				      0, &err);
2629	else {
2630		struct nlattr *rt = attrs[XFRMA_SEC_CTX];
2631		struct xfrm_sec_ctx *ctx;
2632
2633		err = verify_sec_ctx_len(attrs, extack);
2634		if (err)
2635			return err;
2636
2637		ctx = NULL;
2638		if (rt) {
2639			struct xfrm_user_sec_ctx *uctx = nla_data(rt);
2640
2641			err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
2642			if (err)
2643				return err;
2644		}
2645		xp = xfrm_policy_bysel_ctx(net, &m, if_id, type, p->dir,
2646					   &p->sel, ctx, 0, &err);
2647		security_xfrm_policy_free(ctx);
2648	}
2649	if (xp == NULL)
2650		return -ENOENT;
2651
2652	if (unlikely(xp->walk.dead))
2653		goto out;
2654
2655	err = 0;
2656	if (up->hard) {
2657		xfrm_policy_delete(xp, p->dir);
2658		xfrm_audit_policy_delete(xp, 1, true);
2659	}
2660	km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid);
2661
2662out:
2663	xfrm_pol_put(xp);
2664	return err;
2665}
2666
2667static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2668			      struct nlattr **attrs,
2669			      struct netlink_ext_ack *extack)
2670{
2671	struct net *net = sock_net(skb->sk);
2672	struct xfrm_state *x;
2673	int err;
2674	struct xfrm_user_expire *ue = nlmsg_data(nlh);
2675	struct xfrm_usersa_info *p = &ue->state;
2676	struct xfrm_mark m;
2677	u32 mark = xfrm_mark_get(attrs, &m);
2678
2679	x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
2680
2681	err = -ENOENT;
2682	if (x == NULL)
2683		return err;
2684
2685	spin_lock_bh(&x->lock);
2686	err = -EINVAL;
2687	if (x->km.state != XFRM_STATE_VALID) {
2688		NL_SET_ERR_MSG(extack, "SA must be in VALID state");
2689		goto out;
2690	}
2691
2692	km_state_expired(x, ue->hard, nlh->nlmsg_pid);
2693
2694	if (ue->hard) {
2695		__xfrm_state_delete(x);
2696		xfrm_audit_state_delete(x, 1, true);
2697	}
2698	err = 0;
2699out:
2700	spin_unlock_bh(&x->lock);
2701	xfrm_state_put(x);
2702	return err;
2703}
2704
2705static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
2706			    struct nlattr **attrs,
2707			    struct netlink_ext_ack *extack)
2708{
2709	struct net *net = sock_net(skb->sk);
2710	struct xfrm_policy *xp;
2711	struct xfrm_user_tmpl *ut;
2712	int i;
2713	struct nlattr *rt = attrs[XFRMA_TMPL];
2714	struct xfrm_mark mark;
2715
2716	struct xfrm_user_acquire *ua = nlmsg_data(nlh);
2717	struct xfrm_state *x = xfrm_state_alloc(net);
2718	int err = -ENOMEM;
2719
2720	if (!x)
2721		goto nomem;
2722
2723	xfrm_mark_get(attrs, &mark);
2724
2725	err = verify_newpolicy_info(&ua->policy, extack);
2726	if (err)
2727		goto free_state;
2728	err = verify_sec_ctx_len(attrs, extack);
2729	if (err)
2730		goto free_state;
2731
2732	/*   build an XP */
2733	xp = xfrm_policy_construct(net, &ua->policy, attrs, &err, extack);
2734	if (!xp)
2735		goto free_state;
2736
2737	memcpy(&x->id, &ua->id, sizeof(ua->id));
2738	memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
2739	memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
2740	xp->mark.m = x->mark.m = mark.m;
2741	xp->mark.v = x->mark.v = mark.v;
2742	ut = nla_data(rt);
2743	/* extract the templates and for each call km_key */
2744	for (i = 0; i < xp->xfrm_nr; i++, ut++) {
2745		struct xfrm_tmpl *t = &xp->xfrm_vec[i];
2746		memcpy(&x->id, &t->id, sizeof(x->id));
2747		x->props.mode = t->mode;
2748		x->props.reqid = t->reqid;
2749		x->props.family = ut->family;
2750		t->aalgos = ua->aalgos;
2751		t->ealgos = ua->ealgos;
2752		t->calgos = ua->calgos;
2753		err = km_query(x, t, xp);
2754
2755	}
2756
2757	xfrm_state_free(x);
2758	kfree(xp);
2759
2760	return 0;
2761
2762free_state:
2763	xfrm_state_free(x);
2764nomem:
2765	return err;
2766}
2767
2768#ifdef CONFIG_XFRM_MIGRATE
2769static int copy_from_user_migrate(struct xfrm_migrate *ma,
2770				  struct xfrm_kmaddress *k,
2771				  struct nlattr **attrs, int *num,
2772				  struct netlink_ext_ack *extack)
2773{
2774	struct nlattr *rt = attrs[XFRMA_MIGRATE];
2775	struct xfrm_user_migrate *um;
2776	int i, num_migrate;
2777
2778	if (k != NULL) {
2779		struct xfrm_user_kmaddress *uk;
2780
2781		uk = nla_data(attrs[XFRMA_KMADDRESS]);
2782		memcpy(&k->local, &uk->local, sizeof(k->local));
2783		memcpy(&k->remote, &uk->remote, sizeof(k->remote));
2784		k->family = uk->family;
2785		k->reserved = uk->reserved;
2786	}
2787
2788	um = nla_data(rt);
2789	num_migrate = nla_len(rt) / sizeof(*um);
2790
2791	if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH) {
2792		NL_SET_ERR_MSG(extack, "Invalid number of SAs to migrate, must be 0 < num <= XFRM_MAX_DEPTH (6)");
2793		return -EINVAL;
2794	}
2795
2796	for (i = 0; i < num_migrate; i++, um++, ma++) {
2797		memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
2798		memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
2799		memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
2800		memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
2801
2802		ma->proto = um->proto;
2803		ma->mode = um->mode;
2804		ma->reqid = um->reqid;
2805
2806		ma->old_family = um->old_family;
2807		ma->new_family = um->new_family;
2808	}
2809
2810	*num = i;
2811	return 0;
2812}
2813
2814static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2815			   struct nlattr **attrs, struct netlink_ext_ack *extack)
2816{
2817	struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
2818	struct xfrm_migrate m[XFRM_MAX_DEPTH];
2819	struct xfrm_kmaddress km, *kmp;
2820	u8 type;
2821	int err;
2822	int n = 0;
2823	struct net *net = sock_net(skb->sk);
2824	struct xfrm_encap_tmpl  *encap = NULL;
2825	u32 if_id = 0;
2826
2827	if (!attrs[XFRMA_MIGRATE]) {
2828		NL_SET_ERR_MSG(extack, "Missing required MIGRATE attribute");
2829		return -EINVAL;
2830	}
2831
2832	kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
2833
2834	err = copy_from_user_policy_type(&type, attrs, extack);
2835	if (err)
2836		return err;
2837
2838	err = copy_from_user_migrate(m, kmp, attrs, &n, extack);
2839	if (err)
2840		return err;
2841
2842	if (!n)
2843		return 0;
2844
2845	if (attrs[XFRMA_ENCAP]) {
2846		encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
2847				sizeof(*encap), GFP_KERNEL);
2848		if (!encap)
2849			return -ENOMEM;
2850	}
2851
2852	if (attrs[XFRMA_IF_ID])
2853		if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
2854
2855	err = xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net, encap,
2856			   if_id, extack);
2857
2858	kfree(encap);
2859
2860	return err;
2861}
2862#else
2863static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2864			   struct nlattr **attrs, struct netlink_ext_ack *extack)
2865{
2866	return -ENOPROTOOPT;
2867}
2868#endif
2869
2870#ifdef CONFIG_XFRM_MIGRATE
2871static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
2872{
2873	struct xfrm_user_migrate um;
2874
2875	memset(&um, 0, sizeof(um));
2876	um.proto = m->proto;
2877	um.mode = m->mode;
2878	um.reqid = m->reqid;
2879	um.old_family = m->old_family;
2880	memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
2881	memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
2882	um.new_family = m->new_family;
2883	memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
2884	memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
2885
2886	return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
2887}
2888
2889static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
2890{
2891	struct xfrm_user_kmaddress uk;
2892
2893	memset(&uk, 0, sizeof(uk));
2894	uk.family = k->family;
2895	uk.reserved = k->reserved;
2896	memcpy(&uk.local, &k->local, sizeof(uk.local));
2897	memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
2898
2899	return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
2900}
2901
2902static inline unsigned int xfrm_migrate_msgsize(int num_migrate, int with_kma,
2903						int with_encp)
2904{
2905	return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
2906	      + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
2907	      + (with_encp ? nla_total_size(sizeof(struct xfrm_encap_tmpl)) : 0)
2908	      + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
2909	      + userpolicy_type_attrsize();
2910}
2911
2912static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
2913			 int num_migrate, const struct xfrm_kmaddress *k,
2914			 const struct xfrm_selector *sel,
2915			 const struct xfrm_encap_tmpl *encap, u8 dir, u8 type)
2916{
2917	const struct xfrm_migrate *mp;
2918	struct xfrm_userpolicy_id *pol_id;
2919	struct nlmsghdr *nlh;
2920	int i, err;
2921
2922	nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
2923	if (nlh == NULL)
2924		return -EMSGSIZE;
2925
2926	pol_id = nlmsg_data(nlh);
2927	/* copy data from selector, dir, and type to the pol_id */
2928	memset(pol_id, 0, sizeof(*pol_id));
2929	memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
2930	pol_id->dir = dir;
2931
2932	if (k != NULL) {
2933		err = copy_to_user_kmaddress(k, skb);
2934		if (err)
2935			goto out_cancel;
2936	}
2937	if (encap) {
2938		err = nla_put(skb, XFRMA_ENCAP, sizeof(*encap), encap);
2939		if (err)
2940			goto out_cancel;
2941	}
2942	err = copy_to_user_policy_type(type, skb);
2943	if (err)
2944		goto out_cancel;
2945	for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
2946		err = copy_to_user_migrate(mp, skb);
2947		if (err)
2948			goto out_cancel;
2949	}
2950
2951	nlmsg_end(skb, nlh);
2952	return 0;
2953
2954out_cancel:
2955	nlmsg_cancel(skb, nlh);
2956	return err;
2957}
2958
2959static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2960			     const struct xfrm_migrate *m, int num_migrate,
2961			     const struct xfrm_kmaddress *k,
2962			     const struct xfrm_encap_tmpl *encap)
2963{
2964	struct net *net = &init_net;
2965	struct sk_buff *skb;
2966	int err;
2967
2968	skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k, !!encap),
2969			GFP_ATOMIC);
2970	if (skb == NULL)
2971		return -ENOMEM;
2972
2973	/* build migrate */
2974	err = build_migrate(skb, m, num_migrate, k, sel, encap, dir, type);
2975	BUG_ON(err < 0);
2976
2977	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE);
2978}
2979#else
2980static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2981			     const struct xfrm_migrate *m, int num_migrate,
2982			     const struct xfrm_kmaddress *k,
2983			     const struct xfrm_encap_tmpl *encap)
2984{
2985	return -ENOPROTOOPT;
2986}
2987#endif
2988
2989#define XMSGSIZE(type) sizeof(struct type)
2990
2991const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
2992	[XFRM_MSG_NEWSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2993	[XFRM_MSG_DELSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2994	[XFRM_MSG_GETSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2995	[XFRM_MSG_NEWPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2996	[XFRM_MSG_DELPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2997	[XFRM_MSG_GETPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2998	[XFRM_MSG_ALLOCSPI    - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
2999	[XFRM_MSG_ACQUIRE     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
3000	[XFRM_MSG_EXPIRE      - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
3001	[XFRM_MSG_UPDPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
3002	[XFRM_MSG_UPDSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
3003	[XFRM_MSG_POLEXPIRE   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
3004	[XFRM_MSG_FLUSHSA     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
3005	[XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
3006	[XFRM_MSG_NEWAE       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
3007	[XFRM_MSG_GETAE       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
3008	[XFRM_MSG_REPORT      - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
3009	[XFRM_MSG_MIGRATE     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
3010	[XFRM_MSG_GETSADINFO  - XFRM_MSG_BASE] = sizeof(u32),
3011	[XFRM_MSG_NEWSPDINFO  - XFRM_MSG_BASE] = sizeof(u32),
3012	[XFRM_MSG_GETSPDINFO  - XFRM_MSG_BASE] = sizeof(u32),
3013	[XFRM_MSG_SETDEFAULT  - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_default),
3014	[XFRM_MSG_GETDEFAULT  - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_default),
3015};
3016EXPORT_SYMBOL_GPL(xfrm_msg_min);
3017
3018#undef XMSGSIZE
3019
3020const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
3021	[XFRMA_SA]		= { .len = sizeof(struct xfrm_usersa_info)},
3022	[XFRMA_POLICY]		= { .len = sizeof(struct xfrm_userpolicy_info)},
3023	[XFRMA_LASTUSED]	= { .type = NLA_U64},
3024	[XFRMA_ALG_AUTH_TRUNC]	= { .len = sizeof(struct xfrm_algo_auth)},
3025	[XFRMA_ALG_AEAD]	= { .len = sizeof(struct xfrm_algo_aead) },
3026	[XFRMA_ALG_AUTH]	= { .len = sizeof(struct xfrm_algo) },
3027	[XFRMA_ALG_CRYPT]	= { .len = sizeof(struct xfrm_algo) },
3028	[XFRMA_ALG_COMP]	= { .len = sizeof(struct xfrm_algo) },
3029	[XFRMA_ENCAP]		= { .len = sizeof(struct xfrm_encap_tmpl) },
3030	[XFRMA_TMPL]		= { .len = sizeof(struct xfrm_user_tmpl) },
3031	[XFRMA_SEC_CTX]		= { .len = sizeof(struct xfrm_user_sec_ctx) },
3032	[XFRMA_LTIME_VAL]	= { .len = sizeof(struct xfrm_lifetime_cur) },
3033	[XFRMA_REPLAY_VAL]	= { .len = sizeof(struct xfrm_replay_state) },
3034	[XFRMA_REPLAY_THRESH]	= { .type = NLA_U32 },
3035	[XFRMA_ETIMER_THRESH]	= { .type = NLA_U32 },
3036	[XFRMA_SRCADDR]		= { .len = sizeof(xfrm_address_t) },
3037	[XFRMA_COADDR]		= { .len = sizeof(xfrm_address_t) },
3038	[XFRMA_POLICY_TYPE]	= { .len = sizeof(struct xfrm_userpolicy_type)},
3039	[XFRMA_MIGRATE]		= { .len = sizeof(struct xfrm_user_migrate) },
3040	[XFRMA_KMADDRESS]	= { .len = sizeof(struct xfrm_user_kmaddress) },
3041	[XFRMA_MARK]		= { .len = sizeof(struct xfrm_mark) },
3042	[XFRMA_TFCPAD]		= { .type = NLA_U32 },
3043	[XFRMA_REPLAY_ESN_VAL]	= { .len = sizeof(struct xfrm_replay_state_esn) },
3044	[XFRMA_SA_EXTRA_FLAGS]	= { .type = NLA_U32 },
3045	[XFRMA_PROTO]		= { .type = NLA_U8 },
3046	[XFRMA_ADDRESS_FILTER]	= { .len = sizeof(struct xfrm_address_filter) },
3047	[XFRMA_OFFLOAD_DEV]	= { .len = sizeof(struct xfrm_user_offload) },
3048	[XFRMA_SET_MARK]	= { .type = NLA_U32 },
3049	[XFRMA_SET_MARK_MASK]	= { .type = NLA_U32 },
3050	[XFRMA_IF_ID]		= { .type = NLA_U32 },
3051	[XFRMA_MTIMER_THRESH]   = { .type = NLA_U32 },
3052};
3053EXPORT_SYMBOL_GPL(xfrma_policy);
3054
3055static const struct nla_policy xfrma_spd_policy[XFRMA_SPD_MAX+1] = {
3056	[XFRMA_SPD_IPV4_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
3057	[XFRMA_SPD_IPV6_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
3058};
3059
3060static const struct xfrm_link {
3061	int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **,
3062		    struct netlink_ext_ack *);
3063	int (*start)(struct netlink_callback *);
3064	int (*dump)(struct sk_buff *, struct netlink_callback *);
3065	int (*done)(struct netlink_callback *);
3066	const struct nla_policy *nla_pol;
3067	int nla_max;
3068} xfrm_dispatch[XFRM_NR_MSGTYPES] = {
3069	[XFRM_MSG_NEWSA       - XFRM_MSG_BASE] = { .doit = xfrm_add_sa        },
3070	[XFRM_MSG_DELSA       - XFRM_MSG_BASE] = { .doit = xfrm_del_sa        },
3071	[XFRM_MSG_GETSA       - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
3072						   .dump = xfrm_dump_sa,
3073						   .done = xfrm_dump_sa_done  },
3074	[XFRM_MSG_NEWPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_add_policy    },
3075	[XFRM_MSG_DELPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_get_policy    },
3076	[XFRM_MSG_GETPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
3077						   .start = xfrm_dump_policy_start,
3078						   .dump = xfrm_dump_policy,
3079						   .done = xfrm_dump_policy_done },
3080	[XFRM_MSG_ALLOCSPI    - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
3081	[XFRM_MSG_ACQUIRE     - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire   },
3082	[XFRM_MSG_EXPIRE      - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
3083	[XFRM_MSG_UPDPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_add_policy    },
3084	[XFRM_MSG_UPDSA       - XFRM_MSG_BASE] = { .doit = xfrm_add_sa        },
3085	[XFRM_MSG_POLEXPIRE   - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
3086	[XFRM_MSG_FLUSHSA     - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa      },
3087	[XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy  },
3088	[XFRM_MSG_NEWAE       - XFRM_MSG_BASE] = { .doit = xfrm_new_ae  },
3089	[XFRM_MSG_GETAE       - XFRM_MSG_BASE] = { .doit = xfrm_get_ae  },
3090	[XFRM_MSG_MIGRATE     - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate    },
3091	[XFRM_MSG_GETSADINFO  - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo   },
3092	[XFRM_MSG_NEWSPDINFO  - XFRM_MSG_BASE] = { .doit = xfrm_set_spdinfo,
3093						   .nla_pol = xfrma_spd_policy,
3094						   .nla_max = XFRMA_SPD_MAX },
3095	[XFRM_MSG_GETSPDINFO  - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo   },
3096	[XFRM_MSG_SETDEFAULT  - XFRM_MSG_BASE] = { .doit = xfrm_set_default   },
3097	[XFRM_MSG_GETDEFAULT  - XFRM_MSG_BASE] = { .doit = xfrm_get_default   },
3098};
3099
3100static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
3101			     struct netlink_ext_ack *extack)
3102{
3103	struct net *net = sock_net(skb->sk);
3104	struct nlattr *attrs[XFRMA_MAX+1];
3105	const struct xfrm_link *link;
3106	struct nlmsghdr *nlh64 = NULL;
3107	int type, err;
3108
3109	type = nlh->nlmsg_type;
3110	if (type > XFRM_MSG_MAX)
3111		return -EINVAL;
3112
3113	type -= XFRM_MSG_BASE;
3114	link = &xfrm_dispatch[type];
3115
3116	/* All operations require privileges, even GET */
3117	if (!netlink_net_capable(skb, CAP_NET_ADMIN))
3118		return -EPERM;
3119
3120	if (in_compat_syscall()) {
3121		struct xfrm_translator *xtr = xfrm_get_translator();
3122
3123		if (!xtr)
3124			return -EOPNOTSUPP;
3125
3126		nlh64 = xtr->rcv_msg_compat(nlh, link->nla_max,
3127					    link->nla_pol, extack);
3128		xfrm_put_translator(xtr);
3129		if (IS_ERR(nlh64))
3130			return PTR_ERR(nlh64);
3131		if (nlh64)
3132			nlh = nlh64;
3133	}
3134
3135	if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
3136	     type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
3137	    (nlh->nlmsg_flags & NLM_F_DUMP)) {
3138		struct netlink_dump_control c = {
3139			.start = link->start,
3140			.dump = link->dump,
3141			.done = link->done,
3142		};
3143
3144		if (link->dump == NULL) {
3145			err = -EINVAL;
3146			goto err;
3147		}
3148
3149		err = netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
3150		goto err;
3151	}
3152
3153	err = nlmsg_parse_deprecated(nlh, xfrm_msg_min[type], attrs,
3154				     link->nla_max ? : XFRMA_MAX,
3155				     link->nla_pol ? : xfrma_policy, extack);
3156	if (err < 0)
3157		goto err;
3158
3159	if (link->doit == NULL) {
3160		err = -EINVAL;
3161		goto err;
3162	}
3163
3164	err = link->doit(skb, nlh, attrs, extack);
3165
3166	/* We need to free skb allocated in xfrm_alloc_compat() before
3167	 * returning from this function, because consume_skb() won't take
3168	 * care of frag_list since netlink destructor sets
3169	 * sbk->head to NULL. (see netlink_skb_destructor())
3170	 */
3171	if (skb_has_frag_list(skb)) {
3172		kfree_skb(skb_shinfo(skb)->frag_list);
3173		skb_shinfo(skb)->frag_list = NULL;
3174	}
3175
3176err:
3177	kvfree(nlh64);
3178	return err;
3179}
3180
3181static void xfrm_netlink_rcv(struct sk_buff *skb)
3182{
3183	struct net *net = sock_net(skb->sk);
3184
3185	mutex_lock(&net->xfrm.xfrm_cfg_mutex);
3186	netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
3187	mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
3188}
3189
3190static inline unsigned int xfrm_expire_msgsize(void)
3191{
3192	return NLMSG_ALIGN(sizeof(struct xfrm_user_expire))
3193	       + nla_total_size(sizeof(struct xfrm_mark));
3194}
3195
3196static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
3197{
3198	struct xfrm_user_expire *ue;
3199	struct nlmsghdr *nlh;
3200	int err;
3201
3202	nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
3203	if (nlh == NULL)
3204		return -EMSGSIZE;
3205
3206	ue = nlmsg_data(nlh);
3207	copy_to_user_state(x, &ue->state);
3208	ue->hard = (c->data.hard != 0) ? 1 : 0;
3209	/* clear the padding bytes */
3210	memset_after(ue, 0, hard);
3211
3212	err = xfrm_mark_put(skb, &x->mark);
3213	if (err)
3214		return err;
3215
3216	err = xfrm_if_id_put(skb, x->if_id);
3217	if (err)
3218		return err;
3219
3220	nlmsg_end(skb, nlh);
3221	return 0;
3222}
3223
3224static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
3225{
3226	struct net *net = xs_net(x);
3227	struct sk_buff *skb;
3228
3229	skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
3230	if (skb == NULL)
3231		return -ENOMEM;
3232
3233	if (build_expire(skb, x, c) < 0) {
3234		kfree_skb(skb);
3235		return -EMSGSIZE;
3236	}
3237
3238	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
3239}
3240
3241static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
3242{
3243	struct net *net = xs_net(x);
3244	struct sk_buff *skb;
3245	int err;
3246
3247	skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
3248	if (skb == NULL)
3249		return -ENOMEM;
3250
3251	err = build_aevent(skb, x, c);
3252	BUG_ON(err < 0);
3253
3254	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS);
3255}
3256
3257static int xfrm_notify_sa_flush(const struct km_event *c)
3258{
3259	struct net *net = c->net;
3260	struct xfrm_usersa_flush *p;
3261	struct nlmsghdr *nlh;
3262	struct sk_buff *skb;
3263	int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
3264
3265	skb = nlmsg_new(len, GFP_ATOMIC);
3266	if (skb == NULL)
3267		return -ENOMEM;
3268
3269	nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
3270	if (nlh == NULL) {
3271		kfree_skb(skb);
3272		return -EMSGSIZE;
3273	}
3274
3275	p = nlmsg_data(nlh);
3276	p->proto = c->data.proto;
3277
3278	nlmsg_end(skb, nlh);
3279
3280	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
3281}
3282
3283static inline unsigned int xfrm_sa_len(struct xfrm_state *x)
3284{
3285	unsigned int l = 0;
3286	if (x->aead)
3287		l += nla_total_size(aead_len(x->aead));
3288	if (x->aalg) {
3289		l += nla_total_size(sizeof(struct xfrm_algo) +
3290				    (x->aalg->alg_key_len + 7) / 8);
3291		l += nla_total_size(xfrm_alg_auth_len(x->aalg));
3292	}
3293	if (x->ealg)
3294		l += nla_total_size(xfrm_alg_len(x->ealg));
3295	if (x->calg)
3296		l += nla_total_size(sizeof(*x->calg));
3297	if (x->encap)
3298		l += nla_total_size(sizeof(*x->encap));
3299	if (x->tfcpad)
3300		l += nla_total_size(sizeof(x->tfcpad));
3301	if (x->replay_esn)
3302		l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
3303	else
3304		l += nla_total_size(sizeof(struct xfrm_replay_state));
3305	if (x->security)
3306		l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
3307				    x->security->ctx_len);
3308	if (x->coaddr)
3309		l += nla_total_size(sizeof(*x->coaddr));
3310	if (x->props.extra_flags)
3311		l += nla_total_size(sizeof(x->props.extra_flags));
3312	if (x->xso.dev)
3313		 l += nla_total_size(sizeof(struct xfrm_user_offload));
3314	if (x->props.smark.v | x->props.smark.m) {
3315		l += nla_total_size(sizeof(x->props.smark.v));
3316		l += nla_total_size(sizeof(x->props.smark.m));
3317	}
3318	if (x->if_id)
3319		l += nla_total_size(sizeof(x->if_id));
3320
3321	/* Must count x->lastused as it may become non-zero behind our back. */
3322	l += nla_total_size_64bit(sizeof(u64));
3323
3324	if (x->mapping_maxage)
3325		l += nla_total_size(sizeof(x->mapping_maxage));
3326
3327	return l;
3328}
3329
3330static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
3331{
3332	struct net *net = xs_net(x);
3333	struct xfrm_usersa_info *p;
3334	struct xfrm_usersa_id *id;
3335	struct nlmsghdr *nlh;
3336	struct sk_buff *skb;
3337	unsigned int len = xfrm_sa_len(x);
3338	unsigned int headlen;
3339	int err;
3340
3341	headlen = sizeof(*p);
3342	if (c->event == XFRM_MSG_DELSA) {
3343		len += nla_total_size(headlen);
3344		headlen = sizeof(*id);
3345		len += nla_total_size(sizeof(struct xfrm_mark));
3346	}
3347	len += NLMSG_ALIGN(headlen);
3348
3349	skb = nlmsg_new(len, GFP_ATOMIC);
3350	if (skb == NULL)
3351		return -ENOMEM;
3352
3353	nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
3354	err = -EMSGSIZE;
3355	if (nlh == NULL)
3356		goto out_free_skb;
3357
3358	p = nlmsg_data(nlh);
3359	if (c->event == XFRM_MSG_DELSA) {
3360		struct nlattr *attr;
3361
3362		id = nlmsg_data(nlh);
3363		memset(id, 0, sizeof(*id));
3364		memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
3365		id->spi = x->id.spi;
3366		id->family = x->props.family;
3367		id->proto = x->id.proto;
3368
3369		attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
3370		err = -EMSGSIZE;
3371		if (attr == NULL)
3372			goto out_free_skb;
3373
3374		p = nla_data(attr);
3375	}
3376	err = copy_to_user_state_extra(x, p, skb);
3377	if (err)
3378		goto out_free_skb;
3379
3380	nlmsg_end(skb, nlh);
3381
3382	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
3383
3384out_free_skb:
3385	kfree_skb(skb);
3386	return err;
3387}
3388
3389static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
3390{
3391
3392	switch (c->event) {
3393	case XFRM_MSG_EXPIRE:
3394		return xfrm_exp_state_notify(x, c);
3395	case XFRM_MSG_NEWAE:
3396		return xfrm_aevent_state_notify(x, c);
3397	case XFRM_MSG_DELSA:
3398	case XFRM_MSG_UPDSA:
3399	case XFRM_MSG_NEWSA:
3400		return xfrm_notify_sa(x, c);
3401	case XFRM_MSG_FLUSHSA:
3402		return xfrm_notify_sa_flush(c);
3403	default:
3404		printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
3405		       c->event);
3406		break;
3407	}
3408
3409	return 0;
3410
3411}
3412
3413static inline unsigned int xfrm_acquire_msgsize(struct xfrm_state *x,
3414						struct xfrm_policy *xp)
3415{
3416	return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
3417	       + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
3418	       + nla_total_size(sizeof(struct xfrm_mark))
3419	       + nla_total_size(xfrm_user_sec_ctx_size(x->security))
3420	       + userpolicy_type_attrsize();
3421}
3422
3423static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
3424			 struct xfrm_tmpl *xt, struct xfrm_policy *xp)
3425{
3426	__u32 seq = xfrm_get_acqseq();
3427	struct xfrm_user_acquire *ua;
3428	struct nlmsghdr *nlh;
3429	int err;
3430
3431	nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
3432	if (nlh == NULL)
3433		return -EMSGSIZE;
3434
3435	ua = nlmsg_data(nlh);
3436	memcpy(&ua->id, &x->id, sizeof(ua->id));
3437	memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
3438	memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
3439	copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT);
3440	ua->aalgos = xt->aalgos;
3441	ua->ealgos = xt->ealgos;
3442	ua->calgos = xt->calgos;
3443	ua->seq = x->km.seq = seq;
3444
3445	err = copy_to_user_tmpl(xp, skb);
3446	if (!err)
3447		err = copy_to_user_state_sec_ctx(x, skb);
3448	if (!err)
3449		err = copy_to_user_policy_type(xp->type, skb);
3450	if (!err)
3451		err = xfrm_mark_put(skb, &xp->mark);
3452	if (!err)
3453		err = xfrm_if_id_put(skb, xp->if_id);
3454	if (!err && xp->xdo.dev)
3455		err = copy_user_offload(&xp->xdo, skb);
3456	if (err) {
3457		nlmsg_cancel(skb, nlh);
3458		return err;
3459	}
3460
3461	nlmsg_end(skb, nlh);
3462	return 0;
3463}
3464
3465static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
3466			     struct xfrm_policy *xp)
3467{
3468	struct net *net = xs_net(x);
3469	struct sk_buff *skb;
3470	int err;
3471
3472	skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
3473	if (skb == NULL)
3474		return -ENOMEM;
3475
3476	err = build_acquire(skb, x, xt, xp);
3477	BUG_ON(err < 0);
3478
3479	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE);
3480}
3481
3482/* User gives us xfrm_user_policy_info followed by an array of 0
3483 * or more templates.
3484 */
3485static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
3486					       u8 *data, int len, int *dir)
3487{
3488	struct net *net = sock_net(sk);
3489	struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
3490	struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
3491	struct xfrm_policy *xp;
3492	int nr;
3493
3494	switch (sk->sk_family) {
3495	case AF_INET:
3496		if (opt != IP_XFRM_POLICY) {
3497			*dir = -EOPNOTSUPP;
3498			return NULL;
3499		}
3500		break;
3501#if IS_ENABLED(CONFIG_IPV6)
3502	case AF_INET6:
3503		if (opt != IPV6_XFRM_POLICY) {
3504			*dir = -EOPNOTSUPP;
3505			return NULL;
3506		}
3507		break;
3508#endif
3509	default:
3510		*dir = -EINVAL;
3511		return NULL;
3512	}
3513
3514	*dir = -EINVAL;
3515
3516	if (len < sizeof(*p) ||
3517	    verify_newpolicy_info(p, NULL))
3518		return NULL;
3519
3520	nr = ((len - sizeof(*p)) / sizeof(*ut));
3521	if (validate_tmpl(nr, ut, p->sel.family, p->dir, NULL))
3522		return NULL;
3523
3524	if (p->dir > XFRM_POLICY_OUT)
3525		return NULL;
3526
3527	xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3528	if (xp == NULL) {
3529		*dir = -ENOBUFS;
3530		return NULL;
3531	}
3532
3533	copy_from_user_policy(xp, p);
3534	xp->type = XFRM_POLICY_TYPE_MAIN;
3535	copy_templates(xp, ut, nr);
3536
3537	*dir = p->dir;
3538
3539	return xp;
3540}
3541
3542static inline unsigned int xfrm_polexpire_msgsize(struct xfrm_policy *xp)
3543{
3544	return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
3545	       + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
3546	       + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
3547	       + nla_total_size(sizeof(struct xfrm_mark))
3548	       + userpolicy_type_attrsize();
3549}
3550
3551static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
3552			   int dir, const struct km_event *c)
3553{
3554	struct xfrm_user_polexpire *upe;
3555	int hard = c->data.hard;
3556	struct nlmsghdr *nlh;
3557	int err;
3558
3559	nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
3560	if (nlh == NULL)
3561		return -EMSGSIZE;
3562
3563	upe = nlmsg_data(nlh);
3564	copy_to_user_policy(xp, &upe->pol, dir);
3565	err = copy_to_user_tmpl(xp, skb);
3566	if (!err)
3567		err = copy_to_user_sec_ctx(xp, skb);
3568	if (!err)
3569		err = copy_to_user_policy_type(xp->type, skb);
3570	if (!err)
3571		err = xfrm_mark_put(skb, &xp->mark);
3572	if (!err)
3573		err = xfrm_if_id_put(skb, xp->if_id);
3574	if (!err && xp->xdo.dev)
3575		err = copy_user_offload(&xp->xdo, skb);
3576	if (err) {
3577		nlmsg_cancel(skb, nlh);
3578		return err;
3579	}
3580	upe->hard = !!hard;
3581
3582	nlmsg_end(skb, nlh);
3583	return 0;
3584}
3585
3586static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3587{
3588	struct net *net = xp_net(xp);
3589	struct sk_buff *skb;
3590	int err;
3591
3592	skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
3593	if (skb == NULL)
3594		return -ENOMEM;
3595
3596	err = build_polexpire(skb, xp, dir, c);
3597	BUG_ON(err < 0);
3598
3599	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
3600}
3601
3602static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
3603{
3604	unsigned int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
3605	struct net *net = xp_net(xp);
3606	struct xfrm_userpolicy_info *p;
3607	struct xfrm_userpolicy_id *id;
3608	struct nlmsghdr *nlh;
3609	struct sk_buff *skb;
3610	unsigned int headlen;
3611	int err;
3612
3613	headlen = sizeof(*p);
3614	if (c->event == XFRM_MSG_DELPOLICY) {
3615		len += nla_total_size(headlen);
3616		headlen = sizeof(*id);
3617	}
3618	len += userpolicy_type_attrsize();
3619	len += nla_total_size(sizeof(struct xfrm_mark));
3620	len += NLMSG_ALIGN(headlen);
3621
3622	skb = nlmsg_new(len, GFP_ATOMIC);
3623	if (skb == NULL)
3624		return -ENOMEM;
3625
3626	nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
3627	err = -EMSGSIZE;
3628	if (nlh == NULL)
3629		goto out_free_skb;
3630
3631	p = nlmsg_data(nlh);
3632	if (c->event == XFRM_MSG_DELPOLICY) {
3633		struct nlattr *attr;
3634
3635		id = nlmsg_data(nlh);
3636		memset(id, 0, sizeof(*id));
3637		id->dir = dir;
3638		if (c->data.byid)
3639			id->index = xp->index;
3640		else
3641			memcpy(&id->sel, &xp->selector, sizeof(id->sel));
3642
3643		attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
3644		err = -EMSGSIZE;
3645		if (attr == NULL)
3646			goto out_free_skb;
3647
3648		p = nla_data(attr);
3649	}
3650
3651	copy_to_user_policy(xp, p, dir);
3652	err = copy_to_user_tmpl(xp, skb);
3653	if (!err)
3654		err = copy_to_user_policy_type(xp->type, skb);
3655	if (!err)
3656		err = xfrm_mark_put(skb, &xp->mark);
3657	if (!err)
3658		err = xfrm_if_id_put(skb, xp->if_id);
3659	if (!err && xp->xdo.dev)
3660		err = copy_user_offload(&xp->xdo, skb);
3661	if (err)
3662		goto out_free_skb;
3663
3664	nlmsg_end(skb, nlh);
3665
3666	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
3667
3668out_free_skb:
3669	kfree_skb(skb);
3670	return err;
3671}
3672
3673static int xfrm_notify_policy_flush(const struct km_event *c)
3674{
3675	struct net *net = c->net;
3676	struct nlmsghdr *nlh;
3677	struct sk_buff *skb;
3678	int err;
3679
3680	skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
3681	if (skb == NULL)
3682		return -ENOMEM;
3683
3684	nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
3685	err = -EMSGSIZE;
3686	if (nlh == NULL)
3687		goto out_free_skb;
3688	err = copy_to_user_policy_type(c->data.type, skb);
3689	if (err)
3690		goto out_free_skb;
3691
3692	nlmsg_end(skb, nlh);
3693
3694	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
3695
3696out_free_skb:
3697	kfree_skb(skb);
3698	return err;
3699}
3700
3701static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3702{
3703
3704	switch (c->event) {
3705	case XFRM_MSG_NEWPOLICY:
3706	case XFRM_MSG_UPDPOLICY:
3707	case XFRM_MSG_DELPOLICY:
3708		return xfrm_notify_policy(xp, dir, c);
3709	case XFRM_MSG_FLUSHPOLICY:
3710		return xfrm_notify_policy_flush(c);
3711	case XFRM_MSG_POLEXPIRE:
3712		return xfrm_exp_policy_notify(xp, dir, c);
3713	default:
3714		printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
3715		       c->event);
3716	}
3717
3718	return 0;
3719
3720}
3721
3722static inline unsigned int xfrm_report_msgsize(void)
3723{
3724	return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
3725}
3726
3727static int build_report(struct sk_buff *skb, u8 proto,
3728			struct xfrm_selector *sel, xfrm_address_t *addr)
3729{
3730	struct xfrm_user_report *ur;
3731	struct nlmsghdr *nlh;
3732
3733	nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
3734	if (nlh == NULL)
3735		return -EMSGSIZE;
3736
3737	ur = nlmsg_data(nlh);
3738	ur->proto = proto;
3739	memcpy(&ur->sel, sel, sizeof(ur->sel));
3740
3741	if (addr) {
3742		int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr);
3743		if (err) {
3744			nlmsg_cancel(skb, nlh);
3745			return err;
3746		}
3747	}
3748	nlmsg_end(skb, nlh);
3749	return 0;
3750}
3751
3752static int xfrm_send_report(struct net *net, u8 proto,
3753			    struct xfrm_selector *sel, xfrm_address_t *addr)
3754{
3755	struct sk_buff *skb;
3756	int err;
3757
3758	skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
3759	if (skb == NULL)
3760		return -ENOMEM;
3761
3762	err = build_report(skb, proto, sel, addr);
3763	BUG_ON(err < 0);
3764
3765	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT);
3766}
3767
3768static inline unsigned int xfrm_mapping_msgsize(void)
3769{
3770	return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
3771}
3772
3773static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
3774			 xfrm_address_t *new_saddr, __be16 new_sport)
3775{
3776	struct xfrm_user_mapping *um;
3777	struct nlmsghdr *nlh;
3778
3779	nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
3780	if (nlh == NULL)
3781		return -EMSGSIZE;
3782
3783	um = nlmsg_data(nlh);
3784
3785	memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
3786	um->id.spi = x->id.spi;
3787	um->id.family = x->props.family;
3788	um->id.proto = x->id.proto;
3789	memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
3790	memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
3791	um->new_sport = new_sport;
3792	um->old_sport = x->encap->encap_sport;
3793	um->reqid = x->props.reqid;
3794
3795	nlmsg_end(skb, nlh);
3796	return 0;
3797}
3798
3799static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
3800			     __be16 sport)
3801{
3802	struct net *net = xs_net(x);
3803	struct sk_buff *skb;
3804	int err;
3805
3806	if (x->id.proto != IPPROTO_ESP)
3807		return -EINVAL;
3808
3809	if (!x->encap)
3810		return -EINVAL;
3811
3812	skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
3813	if (skb == NULL)
3814		return -ENOMEM;
3815
3816	err = build_mapping(skb, x, ipaddr, sport);
3817	BUG_ON(err < 0);
3818
3819	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING);
3820}
3821
3822static bool xfrm_is_alive(const struct km_event *c)
3823{
3824	return (bool)xfrm_acquire_is_on(c->net);
3825}
3826
3827static struct xfrm_mgr netlink_mgr = {
3828	.notify		= xfrm_send_state_notify,
3829	.acquire	= xfrm_send_acquire,
3830	.compile_policy	= xfrm_compile_policy,
3831	.notify_policy	= xfrm_send_policy_notify,
3832	.report		= xfrm_send_report,
3833	.migrate	= xfrm_send_migrate,
3834	.new_mapping	= xfrm_send_mapping,
3835	.is_alive	= xfrm_is_alive,
3836};
3837
3838static int __net_init xfrm_user_net_init(struct net *net)
3839{
3840	struct sock *nlsk;
3841	struct netlink_kernel_cfg cfg = {
3842		.groups	= XFRMNLGRP_MAX,
3843		.input	= xfrm_netlink_rcv,
3844	};
3845
3846	nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg);
3847	if (nlsk == NULL)
3848		return -ENOMEM;
3849	net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
3850	rcu_assign_pointer(net->xfrm.nlsk, nlsk);
3851	return 0;
3852}
3853
3854static void __net_exit xfrm_user_net_pre_exit(struct net *net)
3855{
3856	RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
3857}
3858
3859static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
3860{
3861	struct net *net;
3862
3863	list_for_each_entry(net, net_exit_list, exit_list)
3864		netlink_kernel_release(net->xfrm.nlsk_stash);
3865}
3866
3867static struct pernet_operations xfrm_user_net_ops = {
3868	.init	    = xfrm_user_net_init,
3869	.pre_exit   = xfrm_user_net_pre_exit,
3870	.exit_batch = xfrm_user_net_exit,
3871};
3872
3873static int __init xfrm_user_init(void)
3874{
3875	int rv;
3876
3877	printk(KERN_INFO "Initializing XFRM netlink socket\n");
3878
3879	rv = register_pernet_subsys(&xfrm_user_net_ops);
3880	if (rv < 0)
3881		return rv;
3882	xfrm_register_km(&netlink_mgr);
3883	return 0;
3884}
3885
3886static void __exit xfrm_user_exit(void)
3887{
3888	xfrm_unregister_km(&netlink_mgr);
3889	unregister_pernet_subsys(&xfrm_user_net_ops);
3890}
3891
3892module_init(xfrm_user_init);
3893module_exit(xfrm_user_exit);
3894MODULE_DESCRIPTION("XFRM User interface");
3895MODULE_LICENSE("GPL");
3896MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);