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 <linux/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, u8 sa_dir,
 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	if (sa_dir == XFRM_SA_DIR_OUT)  {
 172		if (rs->replay_window) {
 173			NL_SET_ERR_MSG(extack, "Replay window should be 0 for output SA");
 174			return -EINVAL;
 175		}
 176		if (rs->seq || rs->seq_hi) {
 177			NL_SET_ERR_MSG(extack,
 178				       "Replay seq and seq_hi should be 0 for output SA");
 179			return -EINVAL;
 180		}
 181		if (rs->bmp_len) {
 182			NL_SET_ERR_MSG(extack, "Replay bmp_len should 0 for output SA");
 183			return -EINVAL;
 184		}
 185	}
 186
 187	if (sa_dir == XFRM_SA_DIR_IN)  {
 188		if (rs->oseq || rs->oseq_hi) {
 189			NL_SET_ERR_MSG(extack,
 190				       "Replay oseq and oseq_hi should be 0 for input SA");
 191			return -EINVAL;
 192		}
 193	}
 194
 195	return 0;
 196}
 197
 198static int verify_newsa_info(struct xfrm_usersa_info *p,
 199			     struct nlattr **attrs,
 200			     struct netlink_ext_ack *extack)
 201{
 202	int err;
 203	u8 sa_dir = nla_get_u8_default(attrs[XFRMA_SA_DIR], 0);
 204	u16 family = p->sel.family;
 205
 206	err = -EINVAL;
 207	switch (p->family) {
 208	case AF_INET:
 209		break;
 210
 211	case AF_INET6:
 212#if IS_ENABLED(CONFIG_IPV6)
 213		break;
 214#else
 215		err = -EAFNOSUPPORT;
 216		NL_SET_ERR_MSG(extack, "IPv6 support disabled");
 217		goto out;
 218#endif
 219
 220	default:
 221		NL_SET_ERR_MSG(extack, "Invalid address family");
 222		goto out;
 223	}
 224
 225	if (!family && !(p->flags & XFRM_STATE_AF_UNSPEC))
 226		family = p->family;
 227
 228	switch (family) {
 229	case AF_UNSPEC:
 230		break;
 231
 232	case AF_INET:
 233		if (p->sel.prefixlen_d > 32 || p->sel.prefixlen_s > 32) {
 234			NL_SET_ERR_MSG(extack, "Invalid prefix length in selector (must be <= 32 for IPv4)");
 235			goto out;
 236		}
 237
 238		break;
 239
 240	case AF_INET6:
 241#if IS_ENABLED(CONFIG_IPV6)
 242		if (p->sel.prefixlen_d > 128 || p->sel.prefixlen_s > 128) {
 243			NL_SET_ERR_MSG(extack, "Invalid prefix length in selector (must be <= 128 for IPv6)");
 244			goto out;
 245		}
 246
 247		break;
 248#else
 249		NL_SET_ERR_MSG(extack, "IPv6 support disabled");
 250		err = -EAFNOSUPPORT;
 251		goto out;
 252#endif
 253
 254	default:
 255		NL_SET_ERR_MSG(extack, "Invalid address family in selector");
 256		goto out;
 257	}
 258
 259	err = -EINVAL;
 260	switch (p->id.proto) {
 261	case IPPROTO_AH:
 262		if (!attrs[XFRMA_ALG_AUTH]	&&
 263		    !attrs[XFRMA_ALG_AUTH_TRUNC]) {
 264			NL_SET_ERR_MSG(extack, "Missing required attribute for AH: AUTH_TRUNC or AUTH");
 265			goto out;
 266		}
 267
 268		if (attrs[XFRMA_ALG_AEAD]	||
 269		    attrs[XFRMA_ALG_CRYPT]	||
 270		    attrs[XFRMA_ALG_COMP]	||
 271		    attrs[XFRMA_TFCPAD]) {
 272			NL_SET_ERR_MSG(extack, "Invalid attributes for AH: AEAD, CRYPT, COMP, TFCPAD");
 273			goto out;
 274		}
 275		break;
 276
 277	case IPPROTO_ESP:
 278		if (attrs[XFRMA_ALG_COMP]) {
 279			NL_SET_ERR_MSG(extack, "Invalid attribute for ESP: COMP");
 280			goto out;
 281		}
 282
 283		if (!attrs[XFRMA_ALG_AUTH] &&
 284		    !attrs[XFRMA_ALG_AUTH_TRUNC] &&
 285		    !attrs[XFRMA_ALG_CRYPT] &&
 286		    !attrs[XFRMA_ALG_AEAD]) {
 287			NL_SET_ERR_MSG(extack, "Missing required attribute for ESP: at least one of AUTH, AUTH_TRUNC, CRYPT, AEAD");
 288			goto out;
 289		}
 290
 291		if ((attrs[XFRMA_ALG_AUTH] ||
 292		     attrs[XFRMA_ALG_AUTH_TRUNC] ||
 293		     attrs[XFRMA_ALG_CRYPT]) &&
 294		    attrs[XFRMA_ALG_AEAD]) {
 295			NL_SET_ERR_MSG(extack, "Invalid attribute combination for ESP: AEAD can't be used with AUTH, AUTH_TRUNC, CRYPT");
 296			goto out;
 297		}
 298
 299		if (attrs[XFRMA_TFCPAD] &&
 300		    p->mode != XFRM_MODE_TUNNEL) {
 301			NL_SET_ERR_MSG(extack, "TFC padding can only be used in tunnel mode");
 302			goto out;
 303		}
 304		break;
 305
 306	case IPPROTO_COMP:
 307		if (!attrs[XFRMA_ALG_COMP]) {
 308			NL_SET_ERR_MSG(extack, "Missing required attribute for COMP: COMP");
 309			goto out;
 310		}
 311
 312		if (attrs[XFRMA_ALG_AEAD]	||
 313		    attrs[XFRMA_ALG_AUTH]	||
 314		    attrs[XFRMA_ALG_AUTH_TRUNC]	||
 315		    attrs[XFRMA_ALG_CRYPT]	||
 316		    attrs[XFRMA_TFCPAD]) {
 317			NL_SET_ERR_MSG(extack, "Invalid attributes for COMP: AEAD, AUTH, AUTH_TRUNC, CRYPT, TFCPAD");
 318			goto out;
 319		}
 320
 321		if (ntohl(p->id.spi) >= 0x10000) {
 322			NL_SET_ERR_MSG(extack, "SPI is too large for COMP (must be < 0x10000)");
 323			goto out;
 324		}
 325		break;
 326
 327#if IS_ENABLED(CONFIG_IPV6)
 328	case IPPROTO_DSTOPTS:
 329	case IPPROTO_ROUTING:
 330		if (attrs[XFRMA_ALG_COMP]	||
 331		    attrs[XFRMA_ALG_AUTH]	||
 332		    attrs[XFRMA_ALG_AUTH_TRUNC]	||
 333		    attrs[XFRMA_ALG_AEAD]	||
 334		    attrs[XFRMA_ALG_CRYPT]	||
 335		    attrs[XFRMA_ENCAP]		||
 336		    attrs[XFRMA_SEC_CTX]	||
 337		    attrs[XFRMA_TFCPAD]) {
 338			NL_SET_ERR_MSG(extack, "Invalid attributes for DSTOPTS/ROUTING");
 339			goto out;
 340		}
 341
 342		if (!attrs[XFRMA_COADDR]) {
 343			NL_SET_ERR_MSG(extack, "Missing required COADDR attribute for DSTOPTS/ROUTING");
 344			goto out;
 345		}
 346		break;
 347#endif
 348
 349	default:
 350		NL_SET_ERR_MSG(extack, "Unsupported protocol");
 351		goto out;
 352	}
 353
 354	if ((err = verify_aead(attrs, extack)))
 355		goto out;
 356	if ((err = verify_auth_trunc(attrs, extack)))
 357		goto out;
 358	if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH, extack)))
 359		goto out;
 360	if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT, extack)))
 361		goto out;
 362	if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP, extack)))
 363		goto out;
 364	if ((err = verify_sec_ctx_len(attrs, extack)))
 365		goto out;
 366	if ((err = verify_replay(p, attrs, sa_dir, extack)))
 367		goto out;
 368
 369	err = -EINVAL;
 370	switch (p->mode) {
 371	case XFRM_MODE_TRANSPORT:
 372	case XFRM_MODE_TUNNEL:
 373	case XFRM_MODE_ROUTEOPTIMIZATION:
 374	case XFRM_MODE_BEET:
 375		break;
 376
 377	default:
 378		NL_SET_ERR_MSG(extack, "Unsupported mode");
 379		goto out;
 380	}
 381
 382	err = 0;
 383
 384	if (attrs[XFRMA_MTIMER_THRESH]) {
 385		if (!attrs[XFRMA_ENCAP]) {
 386			NL_SET_ERR_MSG(extack, "MTIMER_THRESH attribute can only be set on ENCAP states");
 387			err = -EINVAL;
 388			goto out;
 389		}
 390
 391		if (sa_dir == XFRM_SA_DIR_OUT) {
 392			NL_SET_ERR_MSG(extack,
 393				       "MTIMER_THRESH attribute should not be set on output SA");
 394			err = -EINVAL;
 395			goto out;
 396		}
 397	}
 398
 399	if (sa_dir == XFRM_SA_DIR_OUT) {
 400		if (p->flags & XFRM_STATE_DECAP_DSCP) {
 401			NL_SET_ERR_MSG(extack, "Flag DECAP_DSCP should not be set for output SA");
 402			err = -EINVAL;
 403			goto out;
 404		}
 405
 406		if (p->flags & XFRM_STATE_ICMP) {
 407			NL_SET_ERR_MSG(extack, "Flag ICMP should not be set for output SA");
 408			err = -EINVAL;
 409			goto out;
 410		}
 411
 412		if (p->flags & XFRM_STATE_WILDRECV) {
 413			NL_SET_ERR_MSG(extack, "Flag WILDRECV should not be set for output SA");
 414			err = -EINVAL;
 415			goto out;
 416		}
 417
 418		if (p->replay_window) {
 419			NL_SET_ERR_MSG(extack, "Replay window should be 0 for output SA");
 420			err = -EINVAL;
 421			goto out;
 422		}
 423
 424		if (attrs[XFRMA_REPLAY_VAL]) {
 425			struct xfrm_replay_state *replay;
 426
 427			replay = nla_data(attrs[XFRMA_REPLAY_VAL]);
 428
 429			if (replay->seq || replay->bitmap) {
 430				NL_SET_ERR_MSG(extack,
 431					       "Replay seq and bitmap should be 0 for output SA");
 432				err = -EINVAL;
 433				goto out;
 434			}
 435		}
 436	}
 437
 438	if (sa_dir == XFRM_SA_DIR_IN) {
 439		if (p->flags & XFRM_STATE_NOPMTUDISC) {
 440			NL_SET_ERR_MSG(extack, "Flag NOPMTUDISC should not be set for input SA");
 441			err = -EINVAL;
 442			goto out;
 443		}
 444
 445		if (attrs[XFRMA_SA_EXTRA_FLAGS]) {
 446			u32 xflags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]);
 447
 448			if (xflags & XFRM_SA_XFLAG_DONT_ENCAP_DSCP) {
 449				NL_SET_ERR_MSG(extack, "Flag DONT_ENCAP_DSCP should not be set for input SA");
 450				err = -EINVAL;
 451				goto out;
 452			}
 453
 454			if (xflags & XFRM_SA_XFLAG_OSEQ_MAY_WRAP) {
 455				NL_SET_ERR_MSG(extack, "Flag OSEQ_MAY_WRAP should not be set for input SA");
 456				err = -EINVAL;
 457				goto out;
 458			}
 459
 460		}
 461	}
 462
 463	if (!sa_dir && attrs[XFRMA_SA_PCPU]) {
 464		NL_SET_ERR_MSG(extack, "SA_PCPU only supported with SA_DIR");
 465		err = -EINVAL;
 466		goto out;
 467	}
 468
 469out:
 470	return err;
 471}
 472
 473static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
 474			   struct xfrm_algo_desc *(*get_byname)(const char *, int),
 475			   struct nlattr *rta, struct netlink_ext_ack *extack)
 476{
 477	struct xfrm_algo *p, *ualg;
 478	struct xfrm_algo_desc *algo;
 479
 480	if (!rta)
 481		return 0;
 482
 483	ualg = nla_data(rta);
 484
 485	algo = get_byname(ualg->alg_name, 1);
 486	if (!algo) {
 487		NL_SET_ERR_MSG(extack, "Requested COMP algorithm not found");
 488		return -ENOSYS;
 489	}
 490	*props = algo->desc.sadb_alg_id;
 491
 492	p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
 493	if (!p)
 494		return -ENOMEM;
 495
 496	strcpy(p->alg_name, algo->name);
 497	*algpp = p;
 498	return 0;
 499}
 500
 501static int attach_crypt(struct xfrm_state *x, struct nlattr *rta,
 502			struct netlink_ext_ack *extack)
 503{
 504	struct xfrm_algo *p, *ualg;
 505	struct xfrm_algo_desc *algo;
 506
 507	if (!rta)
 508		return 0;
 509
 510	ualg = nla_data(rta);
 511
 512	algo = xfrm_ealg_get_byname(ualg->alg_name, 1);
 513	if (!algo) {
 514		NL_SET_ERR_MSG(extack, "Requested CRYPT algorithm not found");
 515		return -ENOSYS;
 516	}
 517	x->props.ealgo = algo->desc.sadb_alg_id;
 518
 519	p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
 520	if (!p)
 521		return -ENOMEM;
 522
 523	strcpy(p->alg_name, algo->name);
 524	x->ealg = p;
 525	x->geniv = algo->uinfo.encr.geniv;
 526	return 0;
 527}
 528
 529static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,
 530		       struct nlattr *rta, struct netlink_ext_ack *extack)
 531{
 532	struct xfrm_algo *ualg;
 533	struct xfrm_algo_auth *p;
 534	struct xfrm_algo_desc *algo;
 535
 536	if (!rta)
 537		return 0;
 538
 539	ualg = nla_data(rta);
 540
 541	algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
 542	if (!algo) {
 543		NL_SET_ERR_MSG(extack, "Requested AUTH algorithm not found");
 544		return -ENOSYS;
 545	}
 546	*props = algo->desc.sadb_alg_id;
 547
 548	p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL);
 549	if (!p)
 550		return -ENOMEM;
 551
 552	strcpy(p->alg_name, algo->name);
 553	p->alg_key_len = ualg->alg_key_len;
 554	p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
 555	memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8);
 556
 557	*algpp = p;
 558	return 0;
 559}
 560
 561static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,
 562			     struct nlattr *rta, struct netlink_ext_ack *extack)
 563{
 564	struct xfrm_algo_auth *p, *ualg;
 565	struct xfrm_algo_desc *algo;
 566
 567	if (!rta)
 568		return 0;
 569
 570	ualg = nla_data(rta);
 571
 572	algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
 573	if (!algo) {
 574		NL_SET_ERR_MSG(extack, "Requested AUTH_TRUNC algorithm not found");
 575		return -ENOSYS;
 576	}
 577	if (ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits) {
 578		NL_SET_ERR_MSG(extack, "Invalid length requested for truncated ICV");
 579		return -EINVAL;
 580	}
 581	*props = algo->desc.sadb_alg_id;
 582
 583	p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);
 584	if (!p)
 585		return -ENOMEM;
 586
 587	strcpy(p->alg_name, algo->name);
 588	if (!p->alg_trunc_len)
 589		p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
 590
 591	*algpp = p;
 592	return 0;
 593}
 594
 595static int attach_aead(struct xfrm_state *x, struct nlattr *rta,
 596		       struct netlink_ext_ack *extack)
 597{
 598	struct xfrm_algo_aead *p, *ualg;
 599	struct xfrm_algo_desc *algo;
 600
 601	if (!rta)
 602		return 0;
 603
 604	ualg = nla_data(rta);
 605
 606	algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
 607	if (!algo) {
 608		NL_SET_ERR_MSG(extack, "Requested AEAD algorithm not found");
 609		return -ENOSYS;
 610	}
 611	x->props.ealgo = algo->desc.sadb_alg_id;
 612
 613	p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
 614	if (!p)
 615		return -ENOMEM;
 616
 617	strcpy(p->alg_name, algo->name);
 618	x->aead = p;
 619	x->geniv = algo->uinfo.aead.geniv;
 620	return 0;
 621}
 622
 623static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn,
 624					 struct nlattr *rp,
 625					 struct netlink_ext_ack *extack)
 626{
 627	struct xfrm_replay_state_esn *up;
 628	unsigned int ulen;
 629
 630	if (!replay_esn || !rp)
 631		return 0;
 632
 633	up = nla_data(rp);
 634	ulen = xfrm_replay_state_esn_len(up);
 635
 636	/* Check the overall length and the internal bitmap length to avoid
 637	 * potential overflow. */
 638	if (nla_len(rp) < (int)ulen) {
 639		NL_SET_ERR_MSG(extack, "ESN attribute is too short");
 640		return -EINVAL;
 641	}
 642
 643	if (xfrm_replay_state_esn_len(replay_esn) != ulen) {
 644		NL_SET_ERR_MSG(extack, "New ESN size doesn't match the existing SA's ESN size");
 645		return -EINVAL;
 646	}
 647
 648	if (replay_esn->bmp_len != up->bmp_len) {
 649		NL_SET_ERR_MSG(extack, "New ESN bitmap size doesn't match the existing SA's ESN bitmap");
 650		return -EINVAL;
 651	}
 652
 653	if (up->replay_window > up->bmp_len * sizeof(__u32) * 8) {
 654		NL_SET_ERR_MSG(extack, "ESN replay window is longer than the bitmap");
 655		return -EINVAL;
 656	}
 657
 658	return 0;
 659}
 660
 661static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,
 662				       struct xfrm_replay_state_esn **preplay_esn,
 663				       struct nlattr *rta)
 664{
 665	struct xfrm_replay_state_esn *p, *pp, *up;
 666	unsigned int klen, ulen;
 667
 668	if (!rta)
 669		return 0;
 670
 671	up = nla_data(rta);
 672	klen = xfrm_replay_state_esn_len(up);
 673	ulen = nla_len(rta) >= (int)klen ? klen : sizeof(*up);
 674
 675	p = kzalloc(klen, GFP_KERNEL);
 676	if (!p)
 677		return -ENOMEM;
 678
 679	pp = kzalloc(klen, GFP_KERNEL);
 680	if (!pp) {
 681		kfree(p);
 682		return -ENOMEM;
 683	}
 684
 685	memcpy(p, up, ulen);
 686	memcpy(pp, up, ulen);
 687
 688	*replay_esn = p;
 689	*preplay_esn = pp;
 690
 691	return 0;
 692}
 693
 694static inline unsigned int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
 695{
 696	unsigned int len = 0;
 697
 698	if (xfrm_ctx) {
 699		len += sizeof(struct xfrm_user_sec_ctx);
 700		len += xfrm_ctx->ctx_len;
 701	}
 702	return len;
 703}
 704
 705static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
 706{
 707	memcpy(&x->id, &p->id, sizeof(x->id));
 708	memcpy(&x->sel, &p->sel, sizeof(x->sel));
 709	memcpy(&x->lft, &p->lft, sizeof(x->lft));
 710	x->props.mode = p->mode;
 711	x->props.replay_window = min_t(unsigned int, p->replay_window,
 712					sizeof(x->replay.bitmap) * 8);
 713	x->props.reqid = p->reqid;
 714	x->props.family = p->family;
 715	memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
 716	x->props.flags = p->flags;
 717
 718	if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
 719		x->sel.family = p->family;
 720}
 721
 722/*
 723 * someday when pfkey also has support, we could have the code
 724 * somehow made shareable and move it to xfrm_state.c - JHS
 725 *
 726*/
 727static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs,
 728				  int update_esn)
 729{
 730	struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
 731	struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL;
 732	struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
 733	struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
 734	struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
 735	struct nlattr *mt = attrs[XFRMA_MTIMER_THRESH];
 736
 737	if (re && x->replay_esn && x->preplay_esn) {
 738		struct xfrm_replay_state_esn *replay_esn;
 739		replay_esn = nla_data(re);
 740		memcpy(x->replay_esn, replay_esn,
 741		       xfrm_replay_state_esn_len(replay_esn));
 742		memcpy(x->preplay_esn, replay_esn,
 743		       xfrm_replay_state_esn_len(replay_esn));
 744	}
 745
 746	if (rp) {
 747		struct xfrm_replay_state *replay;
 748		replay = nla_data(rp);
 749		memcpy(&x->replay, replay, sizeof(*replay));
 750		memcpy(&x->preplay, replay, sizeof(*replay));
 751	}
 752
 753	if (lt) {
 754		struct xfrm_lifetime_cur *ltime;
 755		ltime = nla_data(lt);
 756		x->curlft.bytes = ltime->bytes;
 757		x->curlft.packets = ltime->packets;
 758		x->curlft.add_time = ltime->add_time;
 759		x->curlft.use_time = ltime->use_time;
 760	}
 761
 762	if (et)
 763		x->replay_maxage = nla_get_u32(et);
 764
 765	if (rt)
 766		x->replay_maxdiff = nla_get_u32(rt);
 767
 768	if (mt)
 769		x->mapping_maxage = nla_get_u32(mt);
 770}
 771
 772static void xfrm_smark_init(struct nlattr **attrs, struct xfrm_mark *m)
 773{
 774	if (attrs[XFRMA_SET_MARK]) {
 775		m->v = nla_get_u32(attrs[XFRMA_SET_MARK]);
 776		m->m = nla_get_u32_default(attrs[XFRMA_SET_MARK_MASK],
 777					   0xffffffff);
 778	} else {
 779		m->v = m->m = 0;
 780	}
 781}
 782
 783static struct xfrm_state *xfrm_state_construct(struct net *net,
 784					       struct xfrm_usersa_info *p,
 785					       struct nlattr **attrs,
 786					       int *errp,
 787					       struct netlink_ext_ack *extack)
 788{
 789	struct xfrm_state *x = xfrm_state_alloc(net);
 790	int err = -ENOMEM;
 791
 792	if (!x)
 793		goto error_no_put;
 794
 795	copy_from_user_state(x, p);
 796
 797	if (attrs[XFRMA_ENCAP]) {
 798		x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
 799				   sizeof(*x->encap), GFP_KERNEL);
 800		if (x->encap == NULL)
 801			goto error;
 802	}
 803
 804	if (attrs[XFRMA_COADDR]) {
 805		x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
 806				    sizeof(*x->coaddr), GFP_KERNEL);
 807		if (x->coaddr == NULL)
 808			goto error;
 809	}
 810
 811	if (attrs[XFRMA_SA_EXTRA_FLAGS])
 812		x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]);
 813
 814	if ((err = attach_aead(x, attrs[XFRMA_ALG_AEAD], extack)))
 815		goto error;
 816	if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
 817				     attrs[XFRMA_ALG_AUTH_TRUNC], extack)))
 818		goto error;
 819	if (!x->props.aalgo) {
 820		if ((err = attach_auth(&x->aalg, &x->props.aalgo,
 821				       attrs[XFRMA_ALG_AUTH], extack)))
 822			goto error;
 823	}
 824	if ((err = attach_crypt(x, attrs[XFRMA_ALG_CRYPT], extack)))
 
 
 825		goto error;
 826	if ((err = attach_one_algo(&x->calg, &x->props.calgo,
 827				   xfrm_calg_get_byname,
 828				   attrs[XFRMA_ALG_COMP], extack)))
 829		goto error;
 830
 
 
 
 
 
 
 
 831	if (attrs[XFRMA_TFCPAD])
 832		x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);
 833
 834	xfrm_mark_get(attrs, &x->mark);
 835
 836	xfrm_smark_init(attrs, &x->props.smark);
 837
 838	if (attrs[XFRMA_IF_ID])
 839		x->if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
 840
 841	if (attrs[XFRMA_SA_DIR])
 842		x->dir = nla_get_u8(attrs[XFRMA_SA_DIR]);
 843
 844	if (attrs[XFRMA_NAT_KEEPALIVE_INTERVAL])
 845		x->nat_keepalive_interval =
 846			nla_get_u32(attrs[XFRMA_NAT_KEEPALIVE_INTERVAL]);
 847
 848	if (attrs[XFRMA_SA_PCPU]) {
 849		x->pcpu_num = nla_get_u32(attrs[XFRMA_SA_PCPU]);
 850		if (x->pcpu_num >= num_possible_cpus())
 851			goto error;
 852	}
 853
 854	err = __xfrm_init_state(x, false, attrs[XFRMA_OFFLOAD_DEV], extack);
 
 
 855	if (err)
 856		goto error;
 857
 858	if (attrs[XFRMA_SEC_CTX]) {
 859		err = security_xfrm_state_alloc(x,
 860						nla_data(attrs[XFRMA_SEC_CTX]));
 861		if (err)
 862			goto error;
 863	}
 864
 865	if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn,
 866					       attrs[XFRMA_REPLAY_ESN_VAL])))
 867		goto error;
 868
 869	x->km.seq = p->seq;
 870	x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
 871	/* sysctl_xfrm_aevent_etime is in 100ms units */
 872	x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
 873
 874	if ((err = xfrm_init_replay(x, extack)))
 875		goto error;
 876
 877	/* override default values from above */
 878	xfrm_update_ae_params(x, attrs, 0);
 879
 880	/* configure the hardware if offload is requested */
 881	if (attrs[XFRMA_OFFLOAD_DEV]) {
 882		err = xfrm_dev_state_add(net, x,
 883					 nla_data(attrs[XFRMA_OFFLOAD_DEV]),
 884					 extack);
 885		if (err)
 886			goto error;
 887	}
 888
 889	return x;
 890
 891error:
 892	x->km.state = XFRM_STATE_DEAD;
 893	xfrm_state_put(x);
 894error_no_put:
 895	*errp = err;
 896	return NULL;
 897}
 898
 899static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
 900		       struct nlattr **attrs, struct netlink_ext_ack *extack)
 901{
 902	struct net *net = sock_net(skb->sk);
 903	struct xfrm_usersa_info *p = nlmsg_data(nlh);
 904	struct xfrm_state *x;
 905	int err;
 906	struct km_event c;
 
 
 
 907
 908	err = verify_newsa_info(p, attrs, extack);
 909	if (err)
 910		return err;
 911
 912	x = xfrm_state_construct(net, p, attrs, &err, extack);
 913	if (!x)
 914		return err;
 915
 916	xfrm_state_hold(x);
 917	if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
 918		err = xfrm_state_add(x);
 919	else
 920		err = xfrm_state_update(x);
 921
 922	xfrm_audit_state_add(x, err ? 0 : 1, true);
 
 923
 924	if (err < 0) {
 925		x->km.state = XFRM_STATE_DEAD;
 926		xfrm_dev_state_delete(x);
 927		__xfrm_state_put(x);
 928		goto out;
 929	}
 930
 931	if (x->km.state == XFRM_STATE_VOID)
 932		x->km.state = XFRM_STATE_VALID;
 933
 934	c.seq = nlh->nlmsg_seq;
 935	c.portid = nlh->nlmsg_pid;
 936	c.event = nlh->nlmsg_type;
 937
 938	km_state_notify(x, &c);
 939out:
 940	xfrm_state_put(x);
 941	return err;
 942}
 943
 944static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
 945						 struct xfrm_usersa_id *p,
 946						 struct nlattr **attrs,
 947						 int *errp)
 948{
 949	struct xfrm_state *x = NULL;
 950	struct xfrm_mark m;
 951	int err;
 952	u32 mark = xfrm_mark_get(attrs, &m);
 953
 954	if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
 955		err = -ESRCH;
 956		x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);
 957	} else {
 958		xfrm_address_t *saddr = NULL;
 959
 960		verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
 961		if (!saddr) {
 962			err = -EINVAL;
 963			goto out;
 964		}
 965
 966		err = -ESRCH;
 967		x = xfrm_state_lookup_byaddr(net, mark,
 968					     &p->daddr, saddr,
 969					     p->proto, p->family);
 970	}
 971
 972 out:
 973	if (!x && errp)
 974		*errp = err;
 975	return x;
 976}
 977
 978static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
 979		       struct nlattr **attrs, struct netlink_ext_ack *extack)
 980{
 981	struct net *net = sock_net(skb->sk);
 982	struct xfrm_state *x;
 983	int err = -ESRCH;
 984	struct km_event c;
 985	struct xfrm_usersa_id *p = nlmsg_data(nlh);
 
 
 
 986
 987	x = xfrm_user_state_lookup(net, p, attrs, &err);
 988	if (x == NULL)
 989		return err;
 990
 991	if ((err = security_xfrm_state_delete(x)) != 0)
 992		goto out;
 993
 994	if (xfrm_state_kern(x)) {
 995		NL_SET_ERR_MSG(extack, "SA is in use by tunnels");
 996		err = -EPERM;
 997		goto out;
 998	}
 999
1000	err = xfrm_state_delete(x);
 
1001	if (err < 0)
1002		goto out;
1003
1004	c.seq = nlh->nlmsg_seq;
1005	c.portid = nlh->nlmsg_pid;
1006	c.event = nlh->nlmsg_type;
1007	km_state_notify(x, &c);
1008
1009out:
1010	xfrm_audit_state_delete(x, err ? 0 : 1, true);
 
1011	xfrm_state_put(x);
1012	return err;
1013}
1014
1015static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
1016{
1017	memset(p, 0, sizeof(*p));
1018	memcpy(&p->id, &x->id, sizeof(p->id));
1019	memcpy(&p->sel, &x->sel, sizeof(p->sel));
1020	memcpy(&p->lft, &x->lft, sizeof(p->lft));
1021	if (x->xso.dev)
1022		xfrm_dev_state_update_stats(x);
1023	memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
1024	put_unaligned(x->stats.replay_window, &p->stats.replay_window);
1025	put_unaligned(x->stats.replay, &p->stats.replay);
1026	put_unaligned(x->stats.integrity_failed, &p->stats.integrity_failed);
1027	memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
1028	p->mode = x->props.mode;
1029	p->replay_window = x->props.replay_window;
1030	p->reqid = x->props.reqid;
1031	p->family = x->props.family;
1032	p->flags = x->props.flags;
1033	p->seq = x->km.seq;
1034}
1035
1036struct xfrm_dump_info {
1037	struct sk_buff *in_skb;
1038	struct sk_buff *out_skb;
1039	u32 nlmsg_seq;
1040	u16 nlmsg_flags;
1041};
1042
1043static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
1044{
1045	struct xfrm_user_sec_ctx *uctx;
1046	struct nlattr *attr;
1047	int ctx_size = sizeof(*uctx) + s->ctx_len;
1048
1049	attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
1050	if (attr == NULL)
1051		return -EMSGSIZE;
1052
1053	uctx = nla_data(attr);
1054	uctx->exttype = XFRMA_SEC_CTX;
1055	uctx->len = ctx_size;
1056	uctx->ctx_doi = s->ctx_doi;
1057	uctx->ctx_alg = s->ctx_alg;
1058	uctx->ctx_len = s->ctx_len;
1059	memcpy(uctx + 1, s->ctx_str, s->ctx_len);
1060
1061	return 0;
1062}
1063
1064static int copy_user_offload(struct xfrm_dev_offload *xso, struct sk_buff *skb)
1065{
1066	struct xfrm_user_offload *xuo;
1067	struct nlattr *attr;
1068
1069	attr = nla_reserve(skb, XFRMA_OFFLOAD_DEV, sizeof(*xuo));
1070	if (attr == NULL)
1071		return -EMSGSIZE;
1072
1073	xuo = nla_data(attr);
1074	memset(xuo, 0, sizeof(*xuo));
1075	xuo->ifindex = xso->dev->ifindex;
1076	if (xso->dir == XFRM_DEV_OFFLOAD_IN)
1077		xuo->flags = XFRM_OFFLOAD_INBOUND;
1078	if (xso->type == XFRM_DEV_OFFLOAD_PACKET)
1079		xuo->flags |= XFRM_OFFLOAD_PACKET;
1080
1081	return 0;
1082}
1083
1084static bool xfrm_redact(void)
1085{
1086	return IS_ENABLED(CONFIG_SECURITY) &&
1087		security_locked_down(LOCKDOWN_XFRM_SECRET);
1088}
1089
1090static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
1091{
1092	struct xfrm_algo *algo;
1093	struct xfrm_algo_auth *ap;
1094	struct nlattr *nla;
1095	bool redact_secret = xfrm_redact();
1096
1097	nla = nla_reserve(skb, XFRMA_ALG_AUTH,
1098			  sizeof(*algo) + (auth->alg_key_len + 7) / 8);
1099	if (!nla)
1100		return -EMSGSIZE;
1101	algo = nla_data(nla);
1102	strscpy_pad(algo->alg_name, auth->alg_name, sizeof(algo->alg_name));
1103
1104	if (redact_secret && auth->alg_key_len)
1105		memset(algo->alg_key, 0, (auth->alg_key_len + 7) / 8);
1106	else
1107		memcpy(algo->alg_key, auth->alg_key,
1108		       (auth->alg_key_len + 7) / 8);
1109	algo->alg_key_len = auth->alg_key_len;
1110
1111	nla = nla_reserve(skb, XFRMA_ALG_AUTH_TRUNC, xfrm_alg_auth_len(auth));
1112	if (!nla)
1113		return -EMSGSIZE;
1114	ap = nla_data(nla);
1115	strscpy_pad(ap->alg_name, auth->alg_name, sizeof(ap->alg_name));
1116	ap->alg_key_len = auth->alg_key_len;
1117	ap->alg_trunc_len = auth->alg_trunc_len;
1118	if (redact_secret && auth->alg_key_len)
1119		memset(ap->alg_key, 0, (auth->alg_key_len + 7) / 8);
1120	else
1121		memcpy(ap->alg_key, auth->alg_key,
1122		       (auth->alg_key_len + 7) / 8);
1123	return 0;
1124}
1125
1126static int copy_to_user_aead(struct xfrm_algo_aead *aead, struct sk_buff *skb)
1127{
1128	struct nlattr *nla = nla_reserve(skb, XFRMA_ALG_AEAD, aead_len(aead));
1129	struct xfrm_algo_aead *ap;
1130	bool redact_secret = xfrm_redact();
1131
1132	if (!nla)
1133		return -EMSGSIZE;
1134
1135	ap = nla_data(nla);
1136	strscpy_pad(ap->alg_name, aead->alg_name, sizeof(ap->alg_name));
1137	ap->alg_key_len = aead->alg_key_len;
1138	ap->alg_icv_len = aead->alg_icv_len;
1139
1140	if (redact_secret && aead->alg_key_len)
1141		memset(ap->alg_key, 0, (aead->alg_key_len + 7) / 8);
1142	else
1143		memcpy(ap->alg_key, aead->alg_key,
1144		       (aead->alg_key_len + 7) / 8);
1145	return 0;
1146}
1147
1148static int copy_to_user_ealg(struct xfrm_algo *ealg, struct sk_buff *skb)
 
 
 
1149{
1150	struct xfrm_algo *ap;
1151	bool redact_secret = xfrm_redact();
1152	struct nlattr *nla = nla_reserve(skb, XFRMA_ALG_CRYPT,
1153					 xfrm_alg_len(ealg));
1154	if (!nla)
1155		return -EMSGSIZE;
1156
1157	ap = nla_data(nla);
1158	strscpy_pad(ap->alg_name, ealg->alg_name, sizeof(ap->alg_name));
1159	ap->alg_key_len = ealg->alg_key_len;
1160
1161	if (redact_secret && ealg->alg_key_len)
1162		memset(ap->alg_key, 0, (ealg->alg_key_len + 7) / 8);
1163	else
1164		memcpy(ap->alg_key, ealg->alg_key,
1165		       (ealg->alg_key_len + 7) / 8);
1166
1167	return 0;
1168}
 
1169
1170static int copy_to_user_calg(struct xfrm_algo *calg, struct sk_buff *skb)
1171{
1172	struct nlattr *nla = nla_reserve(skb, XFRMA_ALG_COMP, sizeof(*calg));
1173	struct xfrm_algo *ap;
 
1174
1175	if (!nla)
1176		return -EMSGSIZE;
 
1177
1178	ap = nla_data(nla);
1179	strscpy_pad(ap->alg_name, calg->alg_name, sizeof(ap->alg_name));
1180	ap->alg_key_len = 0;
1181
1182	return 0;
1183}
 
1184
1185static int copy_to_user_encap(struct xfrm_encap_tmpl *ep, struct sk_buff *skb)
1186{
1187	struct nlattr *nla = nla_reserve(skb, XFRMA_ENCAP, sizeof(*ep));
1188	struct xfrm_encap_tmpl *uep;
1189
1190	if (!nla)
1191		return -EMSGSIZE;
1192
1193	uep = nla_data(nla);
1194	memset(uep, 0, sizeof(*uep));
 
 
 
1195
1196	uep->encap_type = ep->encap_type;
1197	uep->encap_sport = ep->encap_sport;
1198	uep->encap_dport = ep->encap_dport;
1199	uep->encap_oa = ep->encap_oa;
1200
1201	return 0;
1202}
1203
1204static int xfrm_smark_put(struct sk_buff *skb, struct xfrm_mark *m)
1205{
1206	int ret = 0;
1207
1208	if (m->v | m->m) {
1209		ret = nla_put_u32(skb, XFRMA_SET_MARK, m->v);
1210		if (!ret)
1211			ret = nla_put_u32(skb, XFRMA_SET_MARK_MASK, m->m);
1212	}
1213	return ret;
1214}
1215
1216/* Don't change this without updating xfrm_sa_len! */
1217static int copy_to_user_state_extra(struct xfrm_state *x,
1218				    struct xfrm_usersa_info *p,
1219				    struct sk_buff *skb)
1220{
1221	int ret = 0;
1222
1223	copy_to_user_state(x, p);
1224
1225	if (x->props.extra_flags) {
1226		ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS,
1227				  x->props.extra_flags);
1228		if (ret)
1229			goto out;
1230	}
1231
1232	if (x->coaddr) {
1233		ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
1234		if (ret)
1235			goto out;
1236	}
1237	if (x->lastused) {
1238		ret = nla_put_u64_64bit(skb, XFRMA_LASTUSED, x->lastused,
1239					XFRMA_PAD);
1240		if (ret)
1241			goto out;
1242	}
1243	if (x->aead) {
1244		ret = copy_to_user_aead(x->aead, skb);
1245		if (ret)
1246			goto out;
1247	}
1248	if (x->aalg) {
1249		ret = copy_to_user_auth(x->aalg, skb);
1250		if (ret)
1251			goto out;
1252	}
1253	if (x->ealg) {
1254		ret = copy_to_user_ealg(x->ealg, skb);
1255		if (ret)
1256			goto out;
1257	}
1258	if (x->calg) {
1259		ret = copy_to_user_calg(x->calg, skb);
1260		if (ret)
1261			goto out;
1262	}
1263	if (x->encap) {
1264		ret = copy_to_user_encap(x->encap, skb);
1265		if (ret)
1266			goto out;
1267	}
1268	if (x->tfcpad) {
1269		ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad);
1270		if (ret)
1271			goto out;
1272	}
1273	ret = xfrm_mark_put(skb, &x->mark);
1274	if (ret)
1275		goto out;
1276
1277	ret = xfrm_smark_put(skb, &x->props.smark);
1278	if (ret)
1279		goto out;
1280
1281	if (x->replay_esn)
1282		ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
1283			      xfrm_replay_state_esn_len(x->replay_esn),
1284			      x->replay_esn);
1285	else
1286		ret = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
1287			      &x->replay);
1288	if (ret)
1289		goto out;
1290	if(x->xso.dev)
1291		ret = copy_user_offload(&x->xso, skb);
1292	if (ret)
1293		goto out;
1294	if (x->if_id) {
1295		ret = nla_put_u32(skb, XFRMA_IF_ID, x->if_id);
1296		if (ret)
1297			goto out;
1298	}
1299	if (x->security) {
1300		ret = copy_sec_ctx(x->security, skb);
1301		if (ret)
1302			goto out;
1303	}
1304	if (x->mapping_maxage) {
1305		ret = nla_put_u32(skb, XFRMA_MTIMER_THRESH, x->mapping_maxage);
1306		if (ret)
1307			goto out;
1308	}
1309	if (x->pcpu_num != UINT_MAX) {
1310		ret = nla_put_u32(skb, XFRMA_SA_PCPU, x->pcpu_num);
1311		if (ret)
1312			goto out;
1313	}
1314	if (x->dir)
1315		ret = nla_put_u8(skb, XFRMA_SA_DIR, x->dir);
1316
1317	if (x->nat_keepalive_interval) {
1318		ret = nla_put_u32(skb, XFRMA_NAT_KEEPALIVE_INTERVAL,
1319				  x->nat_keepalive_interval);
1320		if (ret)
1321			goto out;
1322	}
1323out:
1324	return ret;
1325}
1326
1327static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
1328{
1329	struct xfrm_dump_info *sp = ptr;
1330	struct sk_buff *in_skb = sp->in_skb;
1331	struct sk_buff *skb = sp->out_skb;
1332	struct xfrm_translator *xtr;
1333	struct xfrm_usersa_info *p;
1334	struct nlmsghdr *nlh;
1335	int err;
1336
1337	nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
1338			XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
1339	if (nlh == NULL)
1340		return -EMSGSIZE;
1341
1342	p = nlmsg_data(nlh);
1343
1344	err = copy_to_user_state_extra(x, p, skb);
1345	if (err) {
1346		nlmsg_cancel(skb, nlh);
1347		return err;
1348	}
1349	nlmsg_end(skb, nlh);
1350
1351	xtr = xfrm_get_translator();
1352	if (xtr) {
1353		err = xtr->alloc_compat(skb, nlh);
1354
1355		xfrm_put_translator(xtr);
1356		if (err) {
1357			nlmsg_cancel(skb, nlh);
1358			return err;
1359		}
1360	}
1361
 
1362	return 0;
 
 
 
 
1363}
1364
1365static int xfrm_dump_sa_done(struct netlink_callback *cb)
1366{
1367	struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
1368	struct sock *sk = cb->skb->sk;
1369	struct net *net = sock_net(sk);
1370
1371	if (cb->args[0])
1372		xfrm_state_walk_done(walk, net);
1373	return 0;
1374}
1375
1376static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
1377{
1378	struct net *net = sock_net(skb->sk);
1379	struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
1380	struct xfrm_dump_info info;
1381
1382	BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
1383		     sizeof(cb->args) - sizeof(cb->args[0]));
1384
1385	info.in_skb = cb->skb;
1386	info.out_skb = skb;
1387	info.nlmsg_seq = cb->nlh->nlmsg_seq;
1388	info.nlmsg_flags = NLM_F_MULTI;
1389
1390	if (!cb->args[0]) {
1391		struct nlattr *attrs[XFRMA_MAX+1];
1392		struct xfrm_address_filter *filter = NULL;
1393		u8 proto = 0;
1394		int err;
1395
1396		err = nlmsg_parse_deprecated(cb->nlh, 0, attrs, XFRMA_MAX,
1397					     xfrma_policy, cb->extack);
1398		if (err < 0)
1399			return err;
1400
1401		if (attrs[XFRMA_ADDRESS_FILTER]) {
1402			filter = kmemdup(nla_data(attrs[XFRMA_ADDRESS_FILTER]),
1403					 sizeof(*filter), GFP_KERNEL);
1404			if (filter == NULL)
1405				return -ENOMEM;
1406
1407			/* see addr_match(), (prefix length >> 5) << 2
1408			 * will be used to compare xfrm_address_t
1409			 */
1410			if (filter->splen > (sizeof(xfrm_address_t) << 3) ||
1411			    filter->dplen > (sizeof(xfrm_address_t) << 3)) {
1412				kfree(filter);
1413				return -EINVAL;
1414			}
1415		}
1416
1417		if (attrs[XFRMA_PROTO])
1418			proto = nla_get_u8(attrs[XFRMA_PROTO]);
1419
1420		xfrm_state_walk_init(walk, proto, filter);
1421		cb->args[0] = 1;
 
1422	}
1423
1424	(void) xfrm_state_walk(net, walk, dump_one_state, &info);
1425
1426	return skb->len;
1427}
1428
1429static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
1430					  struct xfrm_state *x, u32 seq)
1431{
1432	struct xfrm_dump_info info;
1433	struct sk_buff *skb;
1434	int err;
1435
1436	skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1437	if (!skb)
1438		return ERR_PTR(-ENOMEM);
1439
1440	info.in_skb = in_skb;
1441	info.out_skb = skb;
1442	info.nlmsg_seq = seq;
1443	info.nlmsg_flags = 0;
1444
1445	err = dump_one_state(x, 0, &info);
1446	if (err) {
1447		kfree_skb(skb);
1448		return ERR_PTR(err);
1449	}
1450
1451	return skb;
1452}
1453
1454/* A wrapper for nlmsg_multicast() checking that nlsk is still available.
1455 * Must be called with RCU read lock.
1456 */
1457static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb,
1458				       u32 pid, unsigned int group)
1459{
1460	struct sock *nlsk = rcu_dereference(net->xfrm.nlsk);
1461	struct xfrm_translator *xtr;
1462
1463	if (!nlsk) {
1464		kfree_skb(skb);
1465		return -EPIPE;
1466	}
1467
1468	xtr = xfrm_get_translator();
1469	if (xtr) {
1470		int err = xtr->alloc_compat(skb, nlmsg_hdr(skb));
1471
1472		xfrm_put_translator(xtr);
1473		if (err) {
1474			kfree_skb(skb);
1475			return err;
1476		}
1477	}
1478
1479	return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC);
1480}
1481
1482static inline unsigned int xfrm_spdinfo_msgsize(void)
1483{
1484	return NLMSG_ALIGN(4)
1485	       + nla_total_size(sizeof(struct xfrmu_spdinfo))
1486	       + nla_total_size(sizeof(struct xfrmu_spdhinfo))
1487	       + nla_total_size(sizeof(struct xfrmu_spdhthresh))
1488	       + nla_total_size(sizeof(struct xfrmu_spdhthresh));
1489}
1490
1491static int build_spdinfo(struct sk_buff *skb, struct net *net,
1492			 u32 portid, u32 seq, u32 flags)
1493{
1494	struct xfrmk_spdinfo si;
1495	struct xfrmu_spdinfo spc;
1496	struct xfrmu_spdhinfo sph;
1497	struct xfrmu_spdhthresh spt4, spt6;
1498	struct nlmsghdr *nlh;
1499	int err;
1500	u32 *f;
1501	unsigned lseq;
1502
1503	nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
1504	if (nlh == NULL) /* shouldn't really happen ... */
1505		return -EMSGSIZE;
1506
1507	f = nlmsg_data(nlh);
1508	*f = flags;
1509	xfrm_spd_getinfo(net, &si);
1510	spc.incnt = si.incnt;
1511	spc.outcnt = si.outcnt;
1512	spc.fwdcnt = si.fwdcnt;
1513	spc.inscnt = si.inscnt;
1514	spc.outscnt = si.outscnt;
1515	spc.fwdscnt = si.fwdscnt;
1516	sph.spdhcnt = si.spdhcnt;
1517	sph.spdhmcnt = si.spdhmcnt;
1518
1519	do {
1520		lseq = read_seqbegin(&net->xfrm.policy_hthresh.lock);
 
1521
1522		spt4.lbits = net->xfrm.policy_hthresh.lbits4;
1523		spt4.rbits = net->xfrm.policy_hthresh.rbits4;
1524		spt6.lbits = net->xfrm.policy_hthresh.lbits6;
1525		spt6.rbits = net->xfrm.policy_hthresh.rbits6;
1526	} while (read_seqretry(&net->xfrm.policy_hthresh.lock, lseq));
1527
1528	err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
1529	if (!err)
1530		err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
1531	if (!err)
1532		err = nla_put(skb, XFRMA_SPD_IPV4_HTHRESH, sizeof(spt4), &spt4);
1533	if (!err)
1534		err = nla_put(skb, XFRMA_SPD_IPV6_HTHRESH, sizeof(spt6), &spt6);
1535	if (err) {
1536		nlmsg_cancel(skb, nlh);
1537		return err;
1538	}
1539
1540	nlmsg_end(skb, nlh);
1541	return 0;
1542}
1543
1544static int xfrm_set_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1545			    struct nlattr **attrs,
1546			    struct netlink_ext_ack *extack)
1547{
1548	struct net *net = sock_net(skb->sk);
1549	struct xfrmu_spdhthresh *thresh4 = NULL;
1550	struct xfrmu_spdhthresh *thresh6 = NULL;
1551
1552	/* selector prefixlen thresholds to hash policies */
1553	if (attrs[XFRMA_SPD_IPV4_HTHRESH]) {
1554		struct nlattr *rta = attrs[XFRMA_SPD_IPV4_HTHRESH];
1555
1556		if (nla_len(rta) < sizeof(*thresh4)) {
1557			NL_SET_ERR_MSG(extack, "Invalid SPD_IPV4_HTHRESH attribute length");
1558			return -EINVAL;
1559		}
1560		thresh4 = nla_data(rta);
1561		if (thresh4->lbits > 32 || thresh4->rbits > 32) {
1562			NL_SET_ERR_MSG(extack, "Invalid hash threshold (must be <= 32 for IPv4)");
1563			return -EINVAL;
1564		}
1565	}
1566	if (attrs[XFRMA_SPD_IPV6_HTHRESH]) {
1567		struct nlattr *rta = attrs[XFRMA_SPD_IPV6_HTHRESH];
1568
1569		if (nla_len(rta) < sizeof(*thresh6)) {
1570			NL_SET_ERR_MSG(extack, "Invalid SPD_IPV6_HTHRESH attribute length");
1571			return -EINVAL;
1572		}
1573		thresh6 = nla_data(rta);
1574		if (thresh6->lbits > 128 || thresh6->rbits > 128) {
1575			NL_SET_ERR_MSG(extack, "Invalid hash threshold (must be <= 128 for IPv6)");
1576			return -EINVAL;
1577		}
1578	}
1579
1580	if (thresh4 || thresh6) {
1581		write_seqlock(&net->xfrm.policy_hthresh.lock);
1582		if (thresh4) {
1583			net->xfrm.policy_hthresh.lbits4 = thresh4->lbits;
1584			net->xfrm.policy_hthresh.rbits4 = thresh4->rbits;
1585		}
1586		if (thresh6) {
1587			net->xfrm.policy_hthresh.lbits6 = thresh6->lbits;
1588			net->xfrm.policy_hthresh.rbits6 = thresh6->rbits;
1589		}
1590		write_sequnlock(&net->xfrm.policy_hthresh.lock);
1591
1592		xfrm_policy_hash_rebuild(net);
1593	}
1594
1595	return 0;
1596}
1597
1598static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1599			    struct nlattr **attrs,
1600			    struct netlink_ext_ack *extack)
1601{
1602	struct net *net = sock_net(skb->sk);
1603	struct sk_buff *r_skb;
1604	u32 *flags = nlmsg_data(nlh);
1605	u32 sportid = NETLINK_CB(skb).portid;
1606	u32 seq = nlh->nlmsg_seq;
1607	int err;
1608
1609	r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
1610	if (r_skb == NULL)
1611		return -ENOMEM;
1612
1613	err = build_spdinfo(r_skb, net, sportid, seq, *flags);
1614	BUG_ON(err < 0);
1615
1616	return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1617}
1618
1619static inline unsigned int xfrm_sadinfo_msgsize(void)
1620{
1621	return NLMSG_ALIGN(4)
1622	       + nla_total_size(sizeof(struct xfrmu_sadhinfo))
1623	       + nla_total_size(4); /* XFRMA_SAD_CNT */
1624}
1625
1626static int build_sadinfo(struct sk_buff *skb, struct net *net,
1627			 u32 portid, u32 seq, u32 flags)
1628{
1629	struct xfrmk_sadinfo si;
1630	struct xfrmu_sadhinfo sh;
1631	struct nlmsghdr *nlh;
1632	int err;
1633	u32 *f;
1634
1635	nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
1636	if (nlh == NULL) /* shouldn't really happen ... */
1637		return -EMSGSIZE;
1638
1639	f = nlmsg_data(nlh);
1640	*f = flags;
1641	xfrm_sad_getinfo(net, &si);
1642
1643	sh.sadhmcnt = si.sadhmcnt;
1644	sh.sadhcnt = si.sadhcnt;
1645
1646	err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt);
1647	if (!err)
1648		err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
1649	if (err) {
1650		nlmsg_cancel(skb, nlh);
1651		return err;
1652	}
1653
1654	nlmsg_end(skb, nlh);
1655	return 0;
 
 
 
1656}
1657
1658static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1659			    struct nlattr **attrs,
1660			    struct netlink_ext_ack *extack)
1661{
1662	struct net *net = sock_net(skb->sk);
1663	struct sk_buff *r_skb;
1664	u32 *flags = nlmsg_data(nlh);
1665	u32 sportid = NETLINK_CB(skb).portid;
1666	u32 seq = nlh->nlmsg_seq;
1667	int err;
1668
1669	r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
1670	if (r_skb == NULL)
1671		return -ENOMEM;
1672
1673	err = build_sadinfo(r_skb, net, sportid, seq, *flags);
1674	BUG_ON(err < 0);
1675
1676	return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1677}
1678
1679static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1680		       struct nlattr **attrs, struct netlink_ext_ack *extack)
1681{
1682	struct net *net = sock_net(skb->sk);
1683	struct xfrm_usersa_id *p = nlmsg_data(nlh);
1684	struct xfrm_state *x;
1685	struct sk_buff *resp_skb;
1686	int err = -ESRCH;
1687
1688	x = xfrm_user_state_lookup(net, p, attrs, &err);
1689	if (x == NULL)
1690		goto out_noput;
1691
1692	resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1693	if (IS_ERR(resp_skb)) {
1694		err = PTR_ERR(resp_skb);
1695	} else {
1696		err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1697	}
1698	xfrm_state_put(x);
1699out_noput:
1700	return err;
1701}
1702
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1703static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
1704			      struct nlattr **attrs,
1705			      struct netlink_ext_ack *extack)
1706{
1707	struct net *net = sock_net(skb->sk);
1708	struct xfrm_state *x;
1709	struct xfrm_userspi_info *p;
1710	struct xfrm_translator *xtr;
1711	struct sk_buff *resp_skb;
1712	xfrm_address_t *daddr;
1713	int family;
1714	int err;
1715	u32 mark;
1716	struct xfrm_mark m;
1717	u32 if_id = 0;
1718	u32 pcpu_num = UINT_MAX;
1719
1720	p = nlmsg_data(nlh);
1721	err = verify_spi_info(p->info.id.proto, p->min, p->max, extack);
1722	if (err)
1723		goto out_noput;
1724
1725	family = p->info.family;
1726	daddr = &p->info.id.daddr;
1727
1728	x = NULL;
1729
1730	mark = xfrm_mark_get(attrs, &m);
1731
1732	if (attrs[XFRMA_IF_ID])
1733		if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
1734
1735	if (attrs[XFRMA_SA_PCPU]) {
1736		pcpu_num = nla_get_u32(attrs[XFRMA_SA_PCPU]);
1737		if (pcpu_num >= num_possible_cpus()) {
1738			err = -EINVAL;
1739			goto out_noput;
1740		}
1741	}
1742
1743	if (p->info.seq) {
1744		x = xfrm_find_acq_byseq(net, mark, p->info.seq, pcpu_num);
1745		if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) {
1746			xfrm_state_put(x);
1747			x = NULL;
1748		}
1749	}
1750
1751	if (!x)
1752		x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1753				  if_id, pcpu_num, p->info.id.proto, daddr,
1754				  &p->info.saddr, 1,
1755				  family);
1756	err = -ENOENT;
1757	if (!x) {
1758		NL_SET_ERR_MSG(extack, "Target ACQUIRE not found");
1759		goto out_noput;
1760	}
1761
1762	err = xfrm_alloc_spi(x, p->min, p->max, extack);
1763	if (err)
1764		goto out;
1765
1766	if (attrs[XFRMA_SA_DIR])
1767		x->dir = nla_get_u8(attrs[XFRMA_SA_DIR]);
1768
1769	resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1770	if (IS_ERR(resp_skb)) {
1771		err = PTR_ERR(resp_skb);
1772		goto out;
1773	}
1774
1775	xtr = xfrm_get_translator();
1776	if (xtr) {
1777		err = xtr->alloc_compat(skb, nlmsg_hdr(skb));
1778
1779		xfrm_put_translator(xtr);
1780		if (err) {
1781			kfree_skb(resp_skb);
1782			goto out;
1783		}
1784	}
1785
1786	err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1787
1788out:
1789	xfrm_state_put(x);
1790out_noput:
1791	return err;
1792}
1793
1794static int verify_policy_dir(u8 dir, struct netlink_ext_ack *extack)
1795{
1796	switch (dir) {
1797	case XFRM_POLICY_IN:
1798	case XFRM_POLICY_OUT:
1799	case XFRM_POLICY_FWD:
1800		break;
1801
1802	default:
1803		NL_SET_ERR_MSG(extack, "Invalid policy direction");
1804		return -EINVAL;
1805	}
1806
1807	return 0;
1808}
1809
1810static int verify_policy_type(u8 type, struct netlink_ext_ack *extack)
1811{
1812	switch (type) {
1813	case XFRM_POLICY_TYPE_MAIN:
1814#ifdef CONFIG_XFRM_SUB_POLICY
1815	case XFRM_POLICY_TYPE_SUB:
1816#endif
1817		break;
1818
1819	default:
1820		NL_SET_ERR_MSG(extack, "Invalid policy type");
1821		return -EINVAL;
1822	}
1823
1824	return 0;
1825}
1826
1827static int verify_newpolicy_info(struct xfrm_userpolicy_info *p,
1828				 struct netlink_ext_ack *extack)
1829{
1830	int ret;
1831
1832	switch (p->share) {
1833	case XFRM_SHARE_ANY:
1834	case XFRM_SHARE_SESSION:
1835	case XFRM_SHARE_USER:
1836	case XFRM_SHARE_UNIQUE:
1837		break;
1838
1839	default:
1840		NL_SET_ERR_MSG(extack, "Invalid policy share");
1841		return -EINVAL;
1842	}
1843
1844	switch (p->action) {
1845	case XFRM_POLICY_ALLOW:
1846	case XFRM_POLICY_BLOCK:
1847		break;
1848
1849	default:
1850		NL_SET_ERR_MSG(extack, "Invalid policy action");
1851		return -EINVAL;
1852	}
1853
1854	switch (p->sel.family) {
1855	case AF_INET:
1856		if (p->sel.prefixlen_d > 32 || p->sel.prefixlen_s > 32) {
1857			NL_SET_ERR_MSG(extack, "Invalid prefix length in selector (must be <= 32 for IPv4)");
1858			return -EINVAL;
1859		}
1860
1861		break;
1862
1863	case AF_INET6:
1864#if IS_ENABLED(CONFIG_IPV6)
1865		if (p->sel.prefixlen_d > 128 || p->sel.prefixlen_s > 128) {
1866			NL_SET_ERR_MSG(extack, "Invalid prefix length in selector (must be <= 128 for IPv6)");
1867			return -EINVAL;
1868		}
1869
1870		break;
1871#else
1872		NL_SET_ERR_MSG(extack, "IPv6 support disabled");
1873		return  -EAFNOSUPPORT;
1874#endif
1875
1876	default:
1877		NL_SET_ERR_MSG(extack, "Invalid selector family");
1878		return -EINVAL;
1879	}
1880
1881	ret = verify_policy_dir(p->dir, extack);
1882	if (ret)
1883		return ret;
1884	if (p->index && (xfrm_policy_id2dir(p->index) != p->dir)) {
1885		NL_SET_ERR_MSG(extack, "Policy index doesn't match direction");
1886		return -EINVAL;
1887	}
1888
1889	return 0;
1890}
1891
1892static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
1893{
1894	struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1895	struct xfrm_user_sec_ctx *uctx;
1896
1897	if (!rt)
1898		return 0;
1899
1900	uctx = nla_data(rt);
1901	return security_xfrm_policy_alloc(&pol->security, uctx, GFP_KERNEL);
1902}
1903
1904static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1905			   int nr)
1906{
1907	int i;
1908
1909	xp->xfrm_nr = nr;
1910	for (i = 0; i < nr; i++, ut++) {
1911		struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1912
1913		memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1914		memcpy(&t->saddr, &ut->saddr,
1915		       sizeof(xfrm_address_t));
1916		t->reqid = ut->reqid;
1917		t->mode = ut->mode;
1918		t->share = ut->share;
1919		t->optional = ut->optional;
1920		t->aalgos = ut->aalgos;
1921		t->ealgos = ut->ealgos;
1922		t->calgos = ut->calgos;
1923		/* If all masks are ~0, then we allow all algorithms. */
1924		t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
1925		t->encap_family = ut->family;
1926	}
1927}
1928
1929static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family,
1930			 int dir, struct netlink_ext_ack *extack)
1931{
1932	u16 prev_family;
1933	int i;
1934
1935	if (nr > XFRM_MAX_DEPTH) {
1936		NL_SET_ERR_MSG(extack, "Template count must be <= XFRM_MAX_DEPTH (" __stringify(XFRM_MAX_DEPTH) ")");
1937		return -EINVAL;
1938	}
1939
1940	prev_family = family;
1941
1942	for (i = 0; i < nr; i++) {
1943		/* We never validated the ut->family value, so many
1944		 * applications simply leave it at zero.  The check was
1945		 * never made and ut->family was ignored because all
1946		 * templates could be assumed to have the same family as
1947		 * the policy itself.  Now that we will have ipv4-in-ipv6
1948		 * and ipv6-in-ipv4 tunnels, this is no longer true.
1949		 */
1950		if (!ut[i].family)
1951			ut[i].family = family;
1952
1953		switch (ut[i].mode) {
1954		case XFRM_MODE_TUNNEL:
1955		case XFRM_MODE_BEET:
1956			if (ut[i].optional && dir == XFRM_POLICY_OUT) {
1957				NL_SET_ERR_MSG(extack, "Mode in optional template not allowed in outbound policy");
1958				return -EINVAL;
1959			}
1960			break;
1961		default:
1962			if (ut[i].family != prev_family) {
1963				NL_SET_ERR_MSG(extack, "Mode in template doesn't support a family change");
1964				return -EINVAL;
1965			}
1966			break;
1967		}
1968		if (ut[i].mode >= XFRM_MODE_MAX) {
1969			NL_SET_ERR_MSG(extack, "Mode in template must be < XFRM_MODE_MAX (" __stringify(XFRM_MODE_MAX) ")");
1970			return -EINVAL;
1971		}
1972
1973		prev_family = ut[i].family;
1974
1975		switch (ut[i].family) {
1976		case AF_INET:
1977			break;
1978#if IS_ENABLED(CONFIG_IPV6)
1979		case AF_INET6:
1980			break;
1981#endif
1982		default:
1983			NL_SET_ERR_MSG(extack, "Invalid family in template");
1984			return -EINVAL;
1985		}
1986
1987		if (!xfrm_id_proto_valid(ut[i].id.proto)) {
1988			NL_SET_ERR_MSG(extack, "Invalid XFRM protocol in template");
1989			return -EINVAL;
1990		}
1991	}
1992
1993	return 0;
1994}
1995
1996static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs,
1997			       int dir, struct netlink_ext_ack *extack)
1998{
1999	struct nlattr *rt = attrs[XFRMA_TMPL];
2000
2001	if (!rt) {
2002		pol->xfrm_nr = 0;
2003	} else {
2004		struct xfrm_user_tmpl *utmpl = nla_data(rt);
2005		int nr = nla_len(rt) / sizeof(*utmpl);
2006		int err;
2007
2008		err = validate_tmpl(nr, utmpl, pol->family, dir, extack);
2009		if (err)
2010			return err;
2011
2012		copy_templates(pol, utmpl, nr);
2013	}
2014	return 0;
2015}
2016
2017static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs,
2018				      struct netlink_ext_ack *extack)
2019{
2020	struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
2021	struct xfrm_userpolicy_type *upt;
2022	u8 type = XFRM_POLICY_TYPE_MAIN;
2023	int err;
2024
2025	if (rt) {
2026		upt = nla_data(rt);
2027		type = upt->type;
2028	}
2029
2030	err = verify_policy_type(type, extack);
2031	if (err)
2032		return err;
2033
2034	*tp = type;
2035	return 0;
2036}
2037
2038static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
2039{
2040	xp->priority = p->priority;
2041	xp->index = p->index;
2042	memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
2043	memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
2044	xp->action = p->action;
2045	xp->flags = p->flags;
2046	xp->family = p->sel.family;
2047	/* XXX xp->share = p->share; */
2048}
2049
2050static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
2051{
2052	memset(p, 0, sizeof(*p));
2053	memcpy(&p->sel, &xp->selector, sizeof(p->sel));
2054	memcpy(&p->lft, &xp->lft, sizeof(p->lft));
2055	memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
2056	p->priority = xp->priority;
2057	p->index = xp->index;
2058	p->sel.family = xp->family;
2059	p->dir = dir;
2060	p->action = xp->action;
2061	p->flags = xp->flags;
2062	p->share = XFRM_SHARE_ANY; /* XXX xp->share */
2063}
2064
2065static struct xfrm_policy *xfrm_policy_construct(struct net *net,
2066						 struct xfrm_userpolicy_info *p,
2067						 struct nlattr **attrs,
2068						 int *errp,
2069						 struct netlink_ext_ack *extack)
2070{
2071	struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
2072	int err;
2073
2074	if (!xp) {
2075		*errp = -ENOMEM;
2076		return NULL;
2077	}
2078
2079	copy_from_user_policy(xp, p);
2080
2081	err = copy_from_user_policy_type(&xp->type, attrs, extack);
2082	if (err)
2083		goto error;
2084
2085	if (!(err = copy_from_user_tmpl(xp, attrs, p->dir, extack)))
2086		err = copy_from_user_sec_ctx(xp, attrs);
2087	if (err)
2088		goto error;
2089
2090	xfrm_mark_get(attrs, &xp->mark);
2091
2092	if (attrs[XFRMA_IF_ID])
2093		xp->if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
2094
2095	/* configure the hardware if offload is requested */
2096	if (attrs[XFRMA_OFFLOAD_DEV]) {
2097		err = xfrm_dev_policy_add(net, xp,
2098					  nla_data(attrs[XFRMA_OFFLOAD_DEV]),
2099					  p->dir, extack);
2100		if (err)
2101			goto error;
2102	}
2103
2104	return xp;
2105 error:
2106	*errp = err;
2107	xp->walk.dead = 1;
2108	xfrm_policy_destroy(xp);
2109	return NULL;
2110}
2111
2112static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
2113			   struct nlattr **attrs,
2114			   struct netlink_ext_ack *extack)
2115{
2116	struct net *net = sock_net(skb->sk);
2117	struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
2118	struct xfrm_policy *xp;
2119	struct km_event c;
2120	int err;
2121	int excl;
 
 
 
2122
2123	err = verify_newpolicy_info(p, extack);
2124	if (err)
2125		return err;
2126	err = verify_sec_ctx_len(attrs, extack);
2127	if (err)
2128		return err;
2129
2130	xp = xfrm_policy_construct(net, p, attrs, &err, extack);
2131	if (!xp)
2132		return err;
2133
2134	/* shouldn't excl be based on nlh flags??
2135	 * Aha! this is anti-netlink really i.e  more pfkey derived
2136	 * in netlink excl is a flag and you wouldn't need
2137	 * a type XFRM_MSG_UPDPOLICY - JHS */
2138	excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
2139	err = xfrm_policy_insert(p->dir, xp, excl);
2140	xfrm_audit_policy_add(xp, err ? 0 : 1, true);
 
2141
2142	if (err) {
2143		xfrm_dev_policy_delete(xp);
2144		xfrm_dev_policy_free(xp);
2145		security_xfrm_policy_free(xp->security);
2146		kfree(xp);
2147		return err;
2148	}
2149
2150	c.event = nlh->nlmsg_type;
2151	c.seq = nlh->nlmsg_seq;
2152	c.portid = nlh->nlmsg_pid;
2153	km_policy_notify(xp, p->dir, &c);
2154
2155	xfrm_pol_put(xp);
2156
2157	return 0;
2158}
2159
2160static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
2161{
2162	struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
2163	int i;
2164
2165	if (xp->xfrm_nr == 0)
2166		return 0;
2167
2168	if (xp->xfrm_nr > XFRM_MAX_DEPTH)
2169		return -ENOBUFS;
2170
2171	for (i = 0; i < xp->xfrm_nr; i++) {
2172		struct xfrm_user_tmpl *up = &vec[i];
2173		struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
2174
2175		memset(up, 0, sizeof(*up));
2176		memcpy(&up->id, &kp->id, sizeof(up->id));
2177		up->family = kp->encap_family;
2178		memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
2179		up->reqid = kp->reqid;
2180		up->mode = kp->mode;
2181		up->share = kp->share;
2182		up->optional = kp->optional;
2183		up->aalgos = kp->aalgos;
2184		up->ealgos = kp->ealgos;
2185		up->calgos = kp->calgos;
2186	}
2187
2188	return nla_put(skb, XFRMA_TMPL,
2189		       sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
2190}
2191
2192static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
2193{
2194	if (x->security) {
2195		return copy_sec_ctx(x->security, skb);
2196	}
2197	return 0;
2198}
2199
2200static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
2201{
2202	if (xp->security)
2203		return copy_sec_ctx(xp->security, skb);
 
2204	return 0;
2205}
2206static inline unsigned int userpolicy_type_attrsize(void)
2207{
2208#ifdef CONFIG_XFRM_SUB_POLICY
2209	return nla_total_size(sizeof(struct xfrm_userpolicy_type));
2210#else
2211	return 0;
2212#endif
2213}
2214
2215#ifdef CONFIG_XFRM_SUB_POLICY
2216static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
2217{
2218	struct xfrm_userpolicy_type upt;
2219
2220	/* Sadly there are two holes in struct xfrm_userpolicy_type */
2221	memset(&upt, 0, sizeof(upt));
2222	upt.type = type;
2223
2224	return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
2225}
2226
2227#else
2228static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
2229{
2230	return 0;
2231}
2232#endif
2233
2234static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
2235{
2236	struct xfrm_dump_info *sp = ptr;
2237	struct xfrm_userpolicy_info *p;
2238	struct sk_buff *in_skb = sp->in_skb;
2239	struct sk_buff *skb = sp->out_skb;
2240	struct xfrm_translator *xtr;
2241	struct nlmsghdr *nlh;
2242	int err;
2243
2244	nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
2245			XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
2246	if (nlh == NULL)
2247		return -EMSGSIZE;
2248
2249	p = nlmsg_data(nlh);
2250	copy_to_user_policy(xp, p, dir);
2251	err = copy_to_user_tmpl(xp, skb);
2252	if (!err)
2253		err = copy_to_user_sec_ctx(xp, skb);
2254	if (!err)
2255		err = copy_to_user_policy_type(xp->type, skb);
2256	if (!err)
2257		err = xfrm_mark_put(skb, &xp->mark);
2258	if (!err)
2259		err = xfrm_if_id_put(skb, xp->if_id);
2260	if (!err && xp->xdo.dev)
2261		err = copy_user_offload(&xp->xdo, skb);
2262	if (err) {
2263		nlmsg_cancel(skb, nlh);
2264		return err;
2265	}
2266	nlmsg_end(skb, nlh);
2267
2268	xtr = xfrm_get_translator();
2269	if (xtr) {
2270		err = xtr->alloc_compat(skb, nlh);
2271
2272		xfrm_put_translator(xtr);
2273		if (err) {
2274			nlmsg_cancel(skb, nlh);
2275			return err;
2276		}
2277	}
2278
 
2279	return 0;
2280}
2281
2282static int xfrm_dump_policy_done(struct netlink_callback *cb)
2283{
2284	struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
2285	struct net *net = sock_net(cb->skb->sk);
2286
2287	xfrm_policy_walk_done(walk, net);
2288	return 0;
 
 
2289}
2290
2291static int xfrm_dump_policy_start(struct netlink_callback *cb)
2292{
2293	struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
2294
2295	BUILD_BUG_ON(sizeof(*walk) > sizeof(cb->args));
2296
2297	xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
2298	return 0;
2299}
2300
2301static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
2302{
2303	struct net *net = sock_net(skb->sk);
2304	struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
2305	struct xfrm_dump_info info;
2306
 
 
 
2307	info.in_skb = cb->skb;
2308	info.out_skb = skb;
2309	info.nlmsg_seq = cb->nlh->nlmsg_seq;
2310	info.nlmsg_flags = NLM_F_MULTI;
2311
 
 
 
 
 
2312	(void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
2313
2314	return skb->len;
2315}
2316
2317static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
2318					  struct xfrm_policy *xp,
2319					  int dir, u32 seq)
2320{
2321	struct xfrm_dump_info info;
2322	struct sk_buff *skb;
2323	int err;
2324
2325	skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2326	if (!skb)
2327		return ERR_PTR(-ENOMEM);
2328
2329	info.in_skb = in_skb;
2330	info.out_skb = skb;
2331	info.nlmsg_seq = seq;
2332	info.nlmsg_flags = 0;
2333
2334	err = dump_one_policy(xp, dir, 0, &info);
2335	if (err) {
2336		kfree_skb(skb);
2337		return ERR_PTR(err);
2338	}
2339
2340	return skb;
2341}
2342
2343static int xfrm_notify_userpolicy(struct net *net)
2344{
2345	struct xfrm_userpolicy_default *up;
2346	int len = NLMSG_ALIGN(sizeof(*up));
2347	struct nlmsghdr *nlh;
2348	struct sk_buff *skb;
2349	int err;
2350
2351	skb = nlmsg_new(len, GFP_ATOMIC);
2352	if (skb == NULL)
2353		return -ENOMEM;
2354
2355	nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_GETDEFAULT, sizeof(*up), 0);
2356	if (nlh == NULL) {
2357		kfree_skb(skb);
2358		return -EMSGSIZE;
2359	}
2360
2361	up = nlmsg_data(nlh);
2362	up->in = net->xfrm.policy_default[XFRM_POLICY_IN];
2363	up->fwd = net->xfrm.policy_default[XFRM_POLICY_FWD];
2364	up->out = net->xfrm.policy_default[XFRM_POLICY_OUT];
2365
2366	nlmsg_end(skb, nlh);
2367
2368	rcu_read_lock();
2369	err = xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
2370	rcu_read_unlock();
2371
2372	return err;
2373}
2374
2375static bool xfrm_userpolicy_is_valid(__u8 policy)
2376{
2377	return policy == XFRM_USERPOLICY_BLOCK ||
2378	       policy == XFRM_USERPOLICY_ACCEPT;
2379}
2380
2381static int xfrm_set_default(struct sk_buff *skb, struct nlmsghdr *nlh,
2382			    struct nlattr **attrs, struct netlink_ext_ack *extack)
2383{
2384	struct net *net = sock_net(skb->sk);
2385	struct xfrm_userpolicy_default *up = nlmsg_data(nlh);
2386
2387	if (xfrm_userpolicy_is_valid(up->in))
2388		net->xfrm.policy_default[XFRM_POLICY_IN] = up->in;
2389
2390	if (xfrm_userpolicy_is_valid(up->fwd))
2391		net->xfrm.policy_default[XFRM_POLICY_FWD] = up->fwd;
2392
2393	if (xfrm_userpolicy_is_valid(up->out))
2394		net->xfrm.policy_default[XFRM_POLICY_OUT] = up->out;
2395
2396	rt_genid_bump_all(net);
2397
2398	xfrm_notify_userpolicy(net);
2399	return 0;
2400}
2401
2402static int xfrm_get_default(struct sk_buff *skb, struct nlmsghdr *nlh,
2403			    struct nlattr **attrs, struct netlink_ext_ack *extack)
2404{
2405	struct sk_buff *r_skb;
2406	struct nlmsghdr *r_nlh;
2407	struct net *net = sock_net(skb->sk);
2408	struct xfrm_userpolicy_default *r_up;
2409	int len = NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_default));
2410	u32 portid = NETLINK_CB(skb).portid;
2411	u32 seq = nlh->nlmsg_seq;
2412
2413	r_skb = nlmsg_new(len, GFP_ATOMIC);
2414	if (!r_skb)
2415		return -ENOMEM;
2416
2417	r_nlh = nlmsg_put(r_skb, portid, seq, XFRM_MSG_GETDEFAULT, sizeof(*r_up), 0);
2418	if (!r_nlh) {
2419		kfree_skb(r_skb);
2420		return -EMSGSIZE;
2421	}
2422
2423	r_up = nlmsg_data(r_nlh);
2424	r_up->in = net->xfrm.policy_default[XFRM_POLICY_IN];
2425	r_up->fwd = net->xfrm.policy_default[XFRM_POLICY_FWD];
2426	r_up->out = net->xfrm.policy_default[XFRM_POLICY_OUT];
2427	nlmsg_end(r_skb, r_nlh);
2428
2429	return nlmsg_unicast(net->xfrm.nlsk, r_skb, portid);
2430}
2431
2432static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
2433			   struct nlattr **attrs,
2434			   struct netlink_ext_ack *extack)
2435{
2436	struct net *net = sock_net(skb->sk);
2437	struct xfrm_policy *xp;
2438	struct xfrm_userpolicy_id *p;
2439	u8 type = XFRM_POLICY_TYPE_MAIN;
2440	int err;
2441	struct km_event c;
2442	int delete;
2443	struct xfrm_mark m;
2444	u32 if_id = 0;
2445
2446	p = nlmsg_data(nlh);
2447	delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
2448
2449	err = copy_from_user_policy_type(&type, attrs, extack);
2450	if (err)
2451		return err;
2452
2453	err = verify_policy_dir(p->dir, extack);
2454	if (err)
2455		return err;
2456
2457	if (attrs[XFRMA_IF_ID])
2458		if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
2459
2460	xfrm_mark_get(attrs, &m);
2461
2462	if (p->index)
2463		xp = xfrm_policy_byid(net, &m, if_id, type, p->dir,
2464				      p->index, delete, &err);
2465	else {
2466		struct nlattr *rt = attrs[XFRMA_SEC_CTX];
2467		struct xfrm_sec_ctx *ctx;
2468
2469		err = verify_sec_ctx_len(attrs, extack);
2470		if (err)
2471			return err;
2472
2473		ctx = NULL;
2474		if (rt) {
2475			struct xfrm_user_sec_ctx *uctx = nla_data(rt);
2476
2477			err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
2478			if (err)
2479				return err;
2480		}
2481		xp = xfrm_policy_bysel_ctx(net, &m, if_id, type, p->dir,
2482					   &p->sel, ctx, delete, &err);
2483		security_xfrm_policy_free(ctx);
2484	}
2485	if (xp == NULL)
2486		return -ENOENT;
2487
2488	if (!delete) {
2489		struct sk_buff *resp_skb;
2490
2491		resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
2492		if (IS_ERR(resp_skb)) {
2493			err = PTR_ERR(resp_skb);
2494		} else {
2495			err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
2496					    NETLINK_CB(skb).portid);
2497		}
2498	} else {
2499		xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
 
 
 
 
 
 
2500
2501		if (err != 0)
2502			goto out;
2503
2504		c.data.byid = p->index;
2505		c.event = nlh->nlmsg_type;
2506		c.seq = nlh->nlmsg_seq;
2507		c.portid = nlh->nlmsg_pid;
2508		km_policy_notify(xp, p->dir, &c);
2509	}
2510
2511out:
2512	xfrm_pol_put(xp);
2513	return err;
2514}
2515
2516static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
2517			 struct nlattr **attrs,
2518			 struct netlink_ext_ack *extack)
2519{
2520	struct net *net = sock_net(skb->sk);
2521	struct km_event c;
2522	struct xfrm_usersa_flush *p = nlmsg_data(nlh);
 
2523	int err;
2524
2525	err = xfrm_state_flush(net, p->proto, true, false);
 
 
 
2526	if (err) {
2527		if (err == -ESRCH) /* empty table */
2528			return 0;
2529		return err;
2530	}
2531	c.data.proto = p->proto;
2532	c.event = nlh->nlmsg_type;
2533	c.seq = nlh->nlmsg_seq;
2534	c.portid = nlh->nlmsg_pid;
2535	c.net = net;
2536	km_state_notify(NULL, &c);
2537
2538	return 0;
2539}
2540
2541static inline unsigned int xfrm_aevent_msgsize(struct xfrm_state *x)
2542{
2543	unsigned int replay_size = x->replay_esn ?
2544			      xfrm_replay_state_esn_len(x->replay_esn) :
2545			      sizeof(struct xfrm_replay_state);
2546
2547	return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
2548	       + nla_total_size(replay_size)
2549	       + nla_total_size_64bit(sizeof(struct xfrm_lifetime_cur))
2550	       + nla_total_size(sizeof(struct xfrm_mark))
2551	       + nla_total_size(4) /* XFRM_AE_RTHR */
2552	       + nla_total_size(4) /* XFRM_AE_ETHR */
2553	       + nla_total_size(sizeof(x->dir)) /* XFRMA_SA_DIR */
2554	       + nla_total_size(4); /* XFRMA_SA_PCPU */
2555}
2556
2557static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
2558{
2559	struct xfrm_aevent_id *id;
2560	struct nlmsghdr *nlh;
2561	int err;
2562
2563	nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
2564	if (nlh == NULL)
2565		return -EMSGSIZE;
2566
2567	id = nlmsg_data(nlh);
2568	memset(&id->sa_id, 0, sizeof(id->sa_id));
2569	memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr));
2570	id->sa_id.spi = x->id.spi;
2571	id->sa_id.family = x->props.family;
2572	id->sa_id.proto = x->id.proto;
2573	memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr));
2574	id->reqid = x->props.reqid;
2575	id->flags = c->data.aevent;
2576
2577	if (x->replay_esn) {
2578		err = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
2579			      xfrm_replay_state_esn_len(x->replay_esn),
2580			      x->replay_esn);
 
2581	} else {
2582		err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
2583			      &x->replay);
 
2584	}
2585	if (err)
2586		goto out_cancel;
2587	err = nla_put_64bit(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft,
2588			    XFRMA_PAD);
2589	if (err)
2590		goto out_cancel;
2591
2592	if (id->flags & XFRM_AE_RTHR) {
2593		err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
2594		if (err)
2595			goto out_cancel;
2596	}
2597	if (id->flags & XFRM_AE_ETHR) {
2598		err = nla_put_u32(skb, XFRMA_ETIMER_THRESH,
2599				  x->replay_maxage * 10 / HZ);
2600		if (err)
2601			goto out_cancel;
2602	}
2603	err = xfrm_mark_put(skb, &x->mark);
2604	if (err)
2605		goto out_cancel;
2606
2607	err = xfrm_if_id_put(skb, x->if_id);
2608	if (err)
2609		goto out_cancel;
2610	if (x->pcpu_num != UINT_MAX) {
2611		err = nla_put_u32(skb, XFRMA_SA_PCPU, x->pcpu_num);
2612		if (err)
2613			goto out_cancel;
2614	}
2615
2616	if (x->dir) {
2617		err = nla_put_u8(skb, XFRMA_SA_DIR, x->dir);
2618		if (err)
2619			goto out_cancel;
2620	}
2621
2622	nlmsg_end(skb, nlh);
2623	return 0;
2624
2625out_cancel:
2626	nlmsg_cancel(skb, nlh);
2627	return err;
2628}
2629
2630static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
2631		       struct nlattr **attrs, struct netlink_ext_ack *extack)
2632{
2633	struct net *net = sock_net(skb->sk);
2634	struct xfrm_state *x;
2635	struct sk_buff *r_skb;
2636	int err;
2637	struct km_event c;
2638	u32 mark;
2639	struct xfrm_mark m;
2640	struct xfrm_aevent_id *p = nlmsg_data(nlh);
2641	struct xfrm_usersa_id *id = &p->sa_id;
2642
2643	mark = xfrm_mark_get(attrs, &m);
2644
2645	x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
2646	if (x == NULL)
2647		return -ESRCH;
2648
2649	r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2650	if (r_skb == NULL) {
2651		xfrm_state_put(x);
2652		return -ENOMEM;
2653	}
2654
2655	/*
2656	 * XXX: is this lock really needed - none of the other
2657	 * gets lock (the concern is things getting updated
2658	 * while we are still reading) - jhs
2659	*/
2660	spin_lock_bh(&x->lock);
2661	c.data.aevent = p->flags;
2662	c.seq = nlh->nlmsg_seq;
2663	c.portid = nlh->nlmsg_pid;
2664
2665	err = build_aevent(r_skb, x, &c);
2666	BUG_ON(err < 0);
2667
2668	err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid);
 
 
2669	spin_unlock_bh(&x->lock);
2670	xfrm_state_put(x);
2671	return err;
2672}
2673
2674static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
2675		       struct nlattr **attrs, struct netlink_ext_ack *extack)
2676{
2677	struct net *net = sock_net(skb->sk);
2678	struct xfrm_state *x;
2679	struct km_event c;
2680	int err = -EINVAL;
2681	u32 mark = 0;
2682	struct xfrm_mark m;
2683	struct xfrm_aevent_id *p = nlmsg_data(nlh);
2684	struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
2685	struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
2686	struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
2687	struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
2688	struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
2689
2690	if (!lt && !rp && !re && !et && !rt) {
2691		NL_SET_ERR_MSG(extack, "Missing required attribute for AE");
2692		return err;
2693	}
2694
2695	/* pedantic mode - thou shalt sayeth replaceth */
2696	if (!(nlh->nlmsg_flags & NLM_F_REPLACE)) {
2697		NL_SET_ERR_MSG(extack, "NLM_F_REPLACE flag is required");
2698		return err;
2699	}
2700
2701	mark = xfrm_mark_get(attrs, &m);
2702
2703	x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
2704	if (x == NULL)
2705		return -ESRCH;
2706
2707	if (x->km.state != XFRM_STATE_VALID) {
2708		NL_SET_ERR_MSG(extack, "SA must be in VALID state");
2709		goto out;
2710	}
2711
2712	err = xfrm_replay_verify_len(x->replay_esn, re, extack);
2713	if (err)
2714		goto out;
2715
2716	spin_lock_bh(&x->lock);
2717	xfrm_update_ae_params(x, attrs, 1);
2718	spin_unlock_bh(&x->lock);
2719
2720	c.event = nlh->nlmsg_type;
2721	c.seq = nlh->nlmsg_seq;
2722	c.portid = nlh->nlmsg_pid;
2723	c.data.aevent = XFRM_AE_CU;
2724	km_state_notify(x, &c);
2725	err = 0;
2726out:
2727	xfrm_state_put(x);
2728	return err;
2729}
2730
2731static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
2732			     struct nlattr **attrs,
2733			     struct netlink_ext_ack *extack)
2734{
2735	struct net *net = sock_net(skb->sk);
2736	struct km_event c;
2737	u8 type = XFRM_POLICY_TYPE_MAIN;
2738	int err;
 
2739
2740	err = copy_from_user_policy_type(&type, attrs, extack);
2741	if (err)
2742		return err;
2743
2744	err = xfrm_policy_flush(net, type, true);
 
 
 
2745	if (err) {
2746		if (err == -ESRCH) /* empty table */
2747			return 0;
2748		return err;
2749	}
2750
2751	c.data.type = type;
2752	c.event = nlh->nlmsg_type;
2753	c.seq = nlh->nlmsg_seq;
2754	c.portid = nlh->nlmsg_pid;
2755	c.net = net;
2756	km_policy_notify(NULL, 0, &c);
2757	return 0;
2758}
2759
2760static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2761			       struct nlattr **attrs,
2762			       struct netlink_ext_ack *extack)
2763{
2764	struct net *net = sock_net(skb->sk);
2765	struct xfrm_policy *xp;
2766	struct xfrm_user_polexpire *up = nlmsg_data(nlh);
2767	struct xfrm_userpolicy_info *p = &up->pol;
2768	u8 type = XFRM_POLICY_TYPE_MAIN;
2769	int err = -ENOENT;
2770	struct xfrm_mark m;
2771	u32 if_id = 0;
2772
2773	err = copy_from_user_policy_type(&type, attrs, extack);
2774	if (err)
2775		return err;
2776
2777	err = verify_policy_dir(p->dir, extack);
2778	if (err)
2779		return err;
2780
2781	if (attrs[XFRMA_IF_ID])
2782		if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
2783
2784	xfrm_mark_get(attrs, &m);
2785
2786	if (p->index)
2787		xp = xfrm_policy_byid(net, &m, if_id, type, p->dir, p->index,
2788				      0, &err);
2789	else {
2790		struct nlattr *rt = attrs[XFRMA_SEC_CTX];
2791		struct xfrm_sec_ctx *ctx;
2792
2793		err = verify_sec_ctx_len(attrs, extack);
2794		if (err)
2795			return err;
2796
2797		ctx = NULL;
2798		if (rt) {
2799			struct xfrm_user_sec_ctx *uctx = nla_data(rt);
2800
2801			err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
2802			if (err)
2803				return err;
2804		}
2805		xp = xfrm_policy_bysel_ctx(net, &m, if_id, type, p->dir,
2806					   &p->sel, ctx, 0, &err);
2807		security_xfrm_policy_free(ctx);
2808	}
2809	if (xp == NULL)
2810		return -ENOENT;
2811
2812	if (unlikely(xp->walk.dead))
2813		goto out;
2814
2815	err = 0;
2816	if (up->hard) {
 
 
 
 
 
2817		xfrm_policy_delete(xp, p->dir);
2818		xfrm_audit_policy_delete(xp, 1, true);
 
 
 
 
2819	}
2820	km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid);
2821
2822out:
2823	xfrm_pol_put(xp);
2824	return err;
2825}
2826
2827static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2828			      struct nlattr **attrs,
2829			      struct netlink_ext_ack *extack)
2830{
2831	struct net *net = sock_net(skb->sk);
2832	struct xfrm_state *x;
2833	int err;
2834	struct xfrm_user_expire *ue = nlmsg_data(nlh);
2835	struct xfrm_usersa_info *p = &ue->state;
2836	struct xfrm_mark m;
2837	u32 mark = xfrm_mark_get(attrs, &m);
2838
2839	x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
2840
2841	err = -ENOENT;
2842	if (x == NULL)
2843		return err;
2844
2845	spin_lock_bh(&x->lock);
2846	err = -EINVAL;
2847	if (x->km.state != XFRM_STATE_VALID) {
2848		NL_SET_ERR_MSG(extack, "SA must be in VALID state");
2849		goto out;
2850	}
2851
2852	km_state_expired(x, ue->hard, nlh->nlmsg_pid);
2853
2854	if (ue->hard) {
 
 
 
 
 
2855		__xfrm_state_delete(x);
2856		xfrm_audit_state_delete(x, 1, true);
2857	}
2858	err = 0;
2859out:
2860	spin_unlock_bh(&x->lock);
2861	xfrm_state_put(x);
2862	return err;
2863}
2864
2865static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
2866			    struct nlattr **attrs,
2867			    struct netlink_ext_ack *extack)
2868{
2869	struct net *net = sock_net(skb->sk);
2870	struct xfrm_policy *xp;
2871	struct xfrm_user_tmpl *ut;
2872	int i;
2873	struct nlattr *rt = attrs[XFRMA_TMPL];
2874	struct xfrm_mark mark;
2875
2876	struct xfrm_user_acquire *ua = nlmsg_data(nlh);
2877	struct xfrm_state *x = xfrm_state_alloc(net);
2878	int err = -ENOMEM;
2879
2880	if (!x)
2881		goto nomem;
2882
2883	xfrm_mark_get(attrs, &mark);
2884
2885	if (attrs[XFRMA_SA_PCPU]) {
2886		x->pcpu_num = nla_get_u32(attrs[XFRMA_SA_PCPU]);
2887		err = -EINVAL;
2888		if (x->pcpu_num >= num_possible_cpus())
2889			goto free_state;
2890	}
2891
2892	err = verify_newpolicy_info(&ua->policy, extack);
2893	if (err)
2894		goto free_state;
2895	err = verify_sec_ctx_len(attrs, extack);
2896	if (err)
2897		goto free_state;
2898
2899	/*   build an XP */
2900	xp = xfrm_policy_construct(net, &ua->policy, attrs, &err, extack);
2901	if (!xp)
2902		goto free_state;
2903
2904	memcpy(&x->id, &ua->id, sizeof(ua->id));
2905	memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
2906	memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
2907	xp->mark.m = x->mark.m = mark.m;
2908	xp->mark.v = x->mark.v = mark.v;
2909	ut = nla_data(rt);
2910	/* extract the templates and for each call km_key */
2911	for (i = 0; i < xp->xfrm_nr; i++, ut++) {
2912		struct xfrm_tmpl *t = &xp->xfrm_vec[i];
2913		memcpy(&x->id, &t->id, sizeof(x->id));
2914		x->props.mode = t->mode;
2915		x->props.reqid = t->reqid;
2916		x->props.family = ut->family;
2917		t->aalgos = ua->aalgos;
2918		t->ealgos = ua->ealgos;
2919		t->calgos = ua->calgos;
2920		err = km_query(x, t, xp);
2921
2922	}
2923
2924	xfrm_state_free(x);
2925	kfree(xp);
2926
2927	return 0;
2928
 
 
2929free_state:
2930	xfrm_state_free(x);
2931nomem:
2932	return err;
2933}
2934
2935#ifdef CONFIG_XFRM_MIGRATE
2936static int copy_from_user_migrate(struct xfrm_migrate *ma,
2937				  struct xfrm_kmaddress *k,
2938				  struct nlattr **attrs, int *num,
2939				  struct netlink_ext_ack *extack)
2940{
2941	struct nlattr *rt = attrs[XFRMA_MIGRATE];
2942	struct xfrm_user_migrate *um;
2943	int i, num_migrate;
2944
2945	if (k != NULL) {
2946		struct xfrm_user_kmaddress *uk;
2947
2948		uk = nla_data(attrs[XFRMA_KMADDRESS]);
2949		memcpy(&k->local, &uk->local, sizeof(k->local));
2950		memcpy(&k->remote, &uk->remote, sizeof(k->remote));
2951		k->family = uk->family;
2952		k->reserved = uk->reserved;
2953	}
2954
2955	um = nla_data(rt);
2956	num_migrate = nla_len(rt) / sizeof(*um);
2957
2958	if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH) {
2959		NL_SET_ERR_MSG(extack, "Invalid number of SAs to migrate, must be 0 < num <= XFRM_MAX_DEPTH (6)");
2960		return -EINVAL;
2961	}
2962
2963	for (i = 0; i < num_migrate; i++, um++, ma++) {
2964		memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
2965		memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
2966		memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
2967		memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
2968
2969		ma->proto = um->proto;
2970		ma->mode = um->mode;
2971		ma->reqid = um->reqid;
2972
2973		ma->old_family = um->old_family;
2974		ma->new_family = um->new_family;
2975	}
2976
2977	*num = i;
2978	return 0;
2979}
2980
2981static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2982			   struct nlattr **attrs, struct netlink_ext_ack *extack)
2983{
2984	struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
2985	struct xfrm_migrate m[XFRM_MAX_DEPTH];
2986	struct xfrm_kmaddress km, *kmp;
2987	u8 type;
2988	int err;
2989	int n = 0;
2990	struct net *net = sock_net(skb->sk);
2991	struct xfrm_encap_tmpl  *encap = NULL;
2992	u32 if_id = 0;
2993
2994	if (!attrs[XFRMA_MIGRATE]) {
2995		NL_SET_ERR_MSG(extack, "Missing required MIGRATE attribute");
2996		return -EINVAL;
2997	}
2998
2999	kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
3000
3001	err = copy_from_user_policy_type(&type, attrs, extack);
3002	if (err)
3003		return err;
3004
3005	err = copy_from_user_migrate(m, kmp, attrs, &n, extack);
3006	if (err)
3007		return err;
3008
3009	if (!n)
3010		return 0;
3011
3012	if (attrs[XFRMA_ENCAP]) {
3013		encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
3014				sizeof(*encap), GFP_KERNEL);
3015		if (!encap)
3016			return -ENOMEM;
3017	}
3018
3019	if (attrs[XFRMA_IF_ID])
3020		if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
3021
3022	err = xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net, encap,
3023			   if_id, extack);
3024
3025	kfree(encap);
3026
3027	return err;
3028}
3029#else
3030static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
3031			   struct nlattr **attrs, struct netlink_ext_ack *extack)
3032{
3033	return -ENOPROTOOPT;
3034}
3035#endif
3036
3037#ifdef CONFIG_XFRM_MIGRATE
3038static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
3039{
3040	struct xfrm_user_migrate um;
3041
3042	memset(&um, 0, sizeof(um));
3043	um.proto = m->proto;
3044	um.mode = m->mode;
3045	um.reqid = m->reqid;
3046	um.old_family = m->old_family;
3047	memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
3048	memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
3049	um.new_family = m->new_family;
3050	memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
3051	memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
3052
3053	return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
3054}
3055
3056static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
3057{
3058	struct xfrm_user_kmaddress uk;
3059
3060	memset(&uk, 0, sizeof(uk));
3061	uk.family = k->family;
3062	uk.reserved = k->reserved;
3063	memcpy(&uk.local, &k->local, sizeof(uk.local));
3064	memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
3065
3066	return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
3067}
3068
3069static inline unsigned int xfrm_migrate_msgsize(int num_migrate, int with_kma,
3070						int with_encp)
3071{
3072	return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
3073	      + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
3074	      + (with_encp ? nla_total_size(sizeof(struct xfrm_encap_tmpl)) : 0)
3075	      + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
3076	      + userpolicy_type_attrsize();
3077}
3078
3079static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
3080			 int num_migrate, const struct xfrm_kmaddress *k,
3081			 const struct xfrm_selector *sel,
3082			 const struct xfrm_encap_tmpl *encap, u8 dir, u8 type)
3083{
3084	const struct xfrm_migrate *mp;
3085	struct xfrm_userpolicy_id *pol_id;
3086	struct nlmsghdr *nlh;
3087	int i, err;
3088
3089	nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
3090	if (nlh == NULL)
3091		return -EMSGSIZE;
3092
3093	pol_id = nlmsg_data(nlh);
3094	/* copy data from selector, dir, and type to the pol_id */
3095	memset(pol_id, 0, sizeof(*pol_id));
3096	memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
3097	pol_id->dir = dir;
3098
3099	if (k != NULL) {
3100		err = copy_to_user_kmaddress(k, skb);
3101		if (err)
3102			goto out_cancel;
3103	}
3104	if (encap) {
3105		err = nla_put(skb, XFRMA_ENCAP, sizeof(*encap), encap);
3106		if (err)
3107			goto out_cancel;
3108	}
3109	err = copy_to_user_policy_type(type, skb);
3110	if (err)
3111		goto out_cancel;
3112	for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
3113		err = copy_to_user_migrate(mp, skb);
3114		if (err)
3115			goto out_cancel;
3116	}
3117
3118	nlmsg_end(skb, nlh);
3119	return 0;
3120
3121out_cancel:
3122	nlmsg_cancel(skb, nlh);
3123	return err;
3124}
3125
3126static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3127			     const struct xfrm_migrate *m, int num_migrate,
3128			     const struct xfrm_kmaddress *k,
3129			     const struct xfrm_encap_tmpl *encap)
3130{
3131	struct net *net = &init_net;
3132	struct sk_buff *skb;
3133	int err;
3134
3135	skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k, !!encap),
3136			GFP_ATOMIC);
3137	if (skb == NULL)
3138		return -ENOMEM;
3139
3140	/* build migrate */
3141	err = build_migrate(skb, m, num_migrate, k, sel, encap, dir, type);
3142	BUG_ON(err < 0);
3143
3144	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE);
3145}
3146#else
3147static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3148			     const struct xfrm_migrate *m, int num_migrate,
3149			     const struct xfrm_kmaddress *k,
3150			     const struct xfrm_encap_tmpl *encap)
3151{
3152	return -ENOPROTOOPT;
3153}
3154#endif
3155
3156#define XMSGSIZE(type) sizeof(struct type)
3157
3158const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
3159	[XFRM_MSG_NEWSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
3160	[XFRM_MSG_DELSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
3161	[XFRM_MSG_GETSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
3162	[XFRM_MSG_NEWPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
3163	[XFRM_MSG_DELPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
3164	[XFRM_MSG_GETPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
3165	[XFRM_MSG_ALLOCSPI    - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
3166	[XFRM_MSG_ACQUIRE     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
3167	[XFRM_MSG_EXPIRE      - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
3168	[XFRM_MSG_UPDPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
3169	[XFRM_MSG_UPDSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
3170	[XFRM_MSG_POLEXPIRE   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
3171	[XFRM_MSG_FLUSHSA     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
3172	[XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
3173	[XFRM_MSG_NEWAE       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
3174	[XFRM_MSG_GETAE       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
3175	[XFRM_MSG_REPORT      - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
3176	[XFRM_MSG_MIGRATE     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
3177	[XFRM_MSG_GETSADINFO  - XFRM_MSG_BASE] = sizeof(u32),
3178	[XFRM_MSG_NEWSPDINFO  - XFRM_MSG_BASE] = sizeof(u32),
3179	[XFRM_MSG_GETSPDINFO  - XFRM_MSG_BASE] = sizeof(u32),
3180	[XFRM_MSG_SETDEFAULT  - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_default),
3181	[XFRM_MSG_GETDEFAULT  - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_default),
3182};
3183EXPORT_SYMBOL_GPL(xfrm_msg_min);
3184
3185#undef XMSGSIZE
3186
3187const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
3188	[XFRMA_UNSPEC]		= { .strict_start_type = XFRMA_SA_DIR },
3189	[XFRMA_SA]		= { .len = sizeof(struct xfrm_usersa_info)},
3190	[XFRMA_POLICY]		= { .len = sizeof(struct xfrm_userpolicy_info)},
3191	[XFRMA_LASTUSED]	= { .type = NLA_U64},
3192	[XFRMA_ALG_AUTH_TRUNC]	= { .len = sizeof(struct xfrm_algo_auth)},
3193	[XFRMA_ALG_AEAD]	= { .len = sizeof(struct xfrm_algo_aead) },
3194	[XFRMA_ALG_AUTH]	= { .len = sizeof(struct xfrm_algo) },
3195	[XFRMA_ALG_CRYPT]	= { .len = sizeof(struct xfrm_algo) },
3196	[XFRMA_ALG_COMP]	= { .len = sizeof(struct xfrm_algo) },
3197	[XFRMA_ENCAP]		= { .len = sizeof(struct xfrm_encap_tmpl) },
3198	[XFRMA_TMPL]		= { .len = sizeof(struct xfrm_user_tmpl) },
3199	[XFRMA_SEC_CTX]		= { .len = sizeof(struct xfrm_user_sec_ctx) },
3200	[XFRMA_LTIME_VAL]	= { .len = sizeof(struct xfrm_lifetime_cur) },
3201	[XFRMA_REPLAY_VAL]	= { .len = sizeof(struct xfrm_replay_state) },
3202	[XFRMA_REPLAY_THRESH]	= { .type = NLA_U32 },
3203	[XFRMA_ETIMER_THRESH]	= { .type = NLA_U32 },
3204	[XFRMA_SRCADDR]		= { .len = sizeof(xfrm_address_t) },
3205	[XFRMA_COADDR]		= { .len = sizeof(xfrm_address_t) },
3206	[XFRMA_POLICY_TYPE]	= { .len = sizeof(struct xfrm_userpolicy_type)},
3207	[XFRMA_MIGRATE]		= { .len = sizeof(struct xfrm_user_migrate) },
3208	[XFRMA_KMADDRESS]	= { .len = sizeof(struct xfrm_user_kmaddress) },
3209	[XFRMA_MARK]		= { .len = sizeof(struct xfrm_mark) },
3210	[XFRMA_TFCPAD]		= { .type = NLA_U32 },
3211	[XFRMA_REPLAY_ESN_VAL]	= { .len = sizeof(struct xfrm_replay_state_esn) },
3212	[XFRMA_SA_EXTRA_FLAGS]	= { .type = NLA_U32 },
3213	[XFRMA_PROTO]		= { .type = NLA_U8 },
3214	[XFRMA_ADDRESS_FILTER]	= { .len = sizeof(struct xfrm_address_filter) },
3215	[XFRMA_OFFLOAD_DEV]	= { .len = sizeof(struct xfrm_user_offload) },
3216	[XFRMA_SET_MARK]	= { .type = NLA_U32 },
3217	[XFRMA_SET_MARK_MASK]	= { .type = NLA_U32 },
3218	[XFRMA_IF_ID]		= { .type = NLA_U32 },
3219	[XFRMA_MTIMER_THRESH]   = { .type = NLA_U32 },
3220	[XFRMA_SA_DIR]          = NLA_POLICY_RANGE(NLA_U8, XFRM_SA_DIR_IN, XFRM_SA_DIR_OUT),
3221	[XFRMA_NAT_KEEPALIVE_INTERVAL] = { .type = NLA_U32 },
3222	[XFRMA_SA_PCPU]		= { .type = NLA_U32 },
3223};
3224EXPORT_SYMBOL_GPL(xfrma_policy);
3225
3226static const struct nla_policy xfrma_spd_policy[XFRMA_SPD_MAX+1] = {
3227	[XFRMA_SPD_IPV4_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
3228	[XFRMA_SPD_IPV6_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
3229};
3230
3231static const struct xfrm_link {
3232	int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **,
3233		    struct netlink_ext_ack *);
3234	int (*start)(struct netlink_callback *);
3235	int (*dump)(struct sk_buff *, struct netlink_callback *);
3236	int (*done)(struct netlink_callback *);
3237	const struct nla_policy *nla_pol;
3238	int nla_max;
3239} xfrm_dispatch[XFRM_NR_MSGTYPES] = {
3240	[XFRM_MSG_NEWSA       - XFRM_MSG_BASE] = { .doit = xfrm_add_sa        },
3241	[XFRM_MSG_DELSA       - XFRM_MSG_BASE] = { .doit = xfrm_del_sa        },
3242	[XFRM_MSG_GETSA       - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
3243						   .dump = xfrm_dump_sa,
3244						   .done = xfrm_dump_sa_done  },
3245	[XFRM_MSG_NEWPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_add_policy    },
3246	[XFRM_MSG_DELPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_get_policy    },
3247	[XFRM_MSG_GETPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
3248						   .start = xfrm_dump_policy_start,
3249						   .dump = xfrm_dump_policy,
3250						   .done = xfrm_dump_policy_done },
3251	[XFRM_MSG_ALLOCSPI    - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
3252	[XFRM_MSG_ACQUIRE     - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire   },
3253	[XFRM_MSG_EXPIRE      - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
3254	[XFRM_MSG_UPDPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_add_policy    },
3255	[XFRM_MSG_UPDSA       - XFRM_MSG_BASE] = { .doit = xfrm_add_sa        },
3256	[XFRM_MSG_POLEXPIRE   - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
3257	[XFRM_MSG_FLUSHSA     - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa      },
3258	[XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy  },
3259	[XFRM_MSG_NEWAE       - XFRM_MSG_BASE] = { .doit = xfrm_new_ae  },
3260	[XFRM_MSG_GETAE       - XFRM_MSG_BASE] = { .doit = xfrm_get_ae  },
3261	[XFRM_MSG_MIGRATE     - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate    },
3262	[XFRM_MSG_GETSADINFO  - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo   },
3263	[XFRM_MSG_NEWSPDINFO  - XFRM_MSG_BASE] = { .doit = xfrm_set_spdinfo,
3264						   .nla_pol = xfrma_spd_policy,
3265						   .nla_max = XFRMA_SPD_MAX },
3266	[XFRM_MSG_GETSPDINFO  - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo   },
3267	[XFRM_MSG_SETDEFAULT  - XFRM_MSG_BASE] = { .doit = xfrm_set_default   },
3268	[XFRM_MSG_GETDEFAULT  - XFRM_MSG_BASE] = { .doit = xfrm_get_default   },
3269};
3270
3271static int xfrm_reject_unused_attr(int type, struct nlattr **attrs,
3272				   struct netlink_ext_ack *extack)
3273{
3274	if (attrs[XFRMA_SA_DIR]) {
3275		switch (type) {
3276		case XFRM_MSG_NEWSA:
3277		case XFRM_MSG_UPDSA:
3278		case XFRM_MSG_ALLOCSPI:
3279			break;
3280		default:
3281			NL_SET_ERR_MSG(extack, "Invalid attribute SA_DIR");
3282			return -EINVAL;
3283		}
3284	}
3285
3286	if (attrs[XFRMA_SA_PCPU]) {
3287		switch (type) {
3288		case XFRM_MSG_NEWSA:
3289		case XFRM_MSG_UPDSA:
3290		case XFRM_MSG_ALLOCSPI:
3291		case XFRM_MSG_ACQUIRE:
3292
3293			break;
3294		default:
3295			NL_SET_ERR_MSG(extack, "Invalid attribute SA_PCPU");
3296			return -EINVAL;
3297		}
3298	}
3299
3300	return 0;
3301}
3302
3303static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
3304			     struct netlink_ext_ack *extack)
3305{
3306	struct net *net = sock_net(skb->sk);
3307	struct nlattr *attrs[XFRMA_MAX+1];
3308	const struct xfrm_link *link;
3309	struct nlmsghdr *nlh64 = NULL;
3310	int type, err;
3311
3312	type = nlh->nlmsg_type;
3313	if (type > XFRM_MSG_MAX)
3314		return -EINVAL;
3315
3316	type -= XFRM_MSG_BASE;
3317	link = &xfrm_dispatch[type];
3318
3319	/* All operations require privileges, even GET */
3320	if (!netlink_net_capable(skb, CAP_NET_ADMIN))
3321		return -EPERM;
3322
3323	if (in_compat_syscall()) {
3324		struct xfrm_translator *xtr = xfrm_get_translator();
3325
3326		if (!xtr)
3327			return -EOPNOTSUPP;
3328
3329		nlh64 = xtr->rcv_msg_compat(nlh, link->nla_max,
3330					    link->nla_pol, extack);
3331		xfrm_put_translator(xtr);
3332		if (IS_ERR(nlh64))
3333			return PTR_ERR(nlh64);
3334		if (nlh64)
3335			nlh = nlh64;
3336	}
3337
3338	if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
3339	     type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
3340	    (nlh->nlmsg_flags & NLM_F_DUMP)) {
3341		struct netlink_dump_control c = {
3342			.start = link->start,
3343			.dump = link->dump,
3344			.done = link->done,
3345		};
3346
3347		if (link->dump == NULL) {
3348			err = -EINVAL;
3349			goto err;
 
 
 
3350		}
3351
3352		err = netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
3353		goto err;
3354	}
3355
3356	err = nlmsg_parse_deprecated(nlh, xfrm_msg_min[type], attrs,
3357				     link->nla_max ? : XFRMA_MAX,
3358				     link->nla_pol ? : xfrma_policy, extack);
3359	if (err < 0)
3360		goto err;
3361
3362	if (!link->nla_pol || link->nla_pol == xfrma_policy) {
3363		err = xfrm_reject_unused_attr((type + XFRM_MSG_BASE), attrs, extack);
3364		if (err < 0)
3365			goto err;
3366	}
3367
3368	if (link->doit == NULL) {
3369		err = -EINVAL;
3370		goto err;
3371	}
3372
3373	err = link->doit(skb, nlh, attrs, extack);
3374
3375	/* We need to free skb allocated in xfrm_alloc_compat() before
3376	 * returning from this function, because consume_skb() won't take
3377	 * care of frag_list since netlink destructor sets
3378	 * sbk->head to NULL. (see netlink_skb_destructor())
3379	 */
3380	if (skb_has_frag_list(skb)) {
3381		kfree_skb(skb_shinfo(skb)->frag_list);
3382		skb_shinfo(skb)->frag_list = NULL;
3383	}
3384
3385err:
3386	kvfree(nlh64);
3387	return err;
3388}
3389
3390static void xfrm_netlink_rcv(struct sk_buff *skb)
3391{
3392	struct net *net = sock_net(skb->sk);
3393
3394	mutex_lock(&net->xfrm.xfrm_cfg_mutex);
3395	netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
3396	mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
3397}
3398
3399static inline unsigned int xfrm_expire_msgsize(void)
3400{
3401	return NLMSG_ALIGN(sizeof(struct xfrm_user_expire)) +
3402	       nla_total_size(sizeof(struct xfrm_mark)) +
3403	       nla_total_size(sizeof_field(struct xfrm_state, dir)) +
3404	       nla_total_size(4); /* XFRMA_SA_PCPU */
3405}
3406
3407static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
3408{
3409	struct xfrm_user_expire *ue;
3410	struct nlmsghdr *nlh;
3411	int err;
3412
3413	nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
3414	if (nlh == NULL)
3415		return -EMSGSIZE;
3416
3417	ue = nlmsg_data(nlh);
3418	copy_to_user_state(x, &ue->state);
3419	ue->hard = (c->data.hard != 0) ? 1 : 0;
3420	/* clear the padding bytes */
3421	memset_after(ue, 0, hard);
3422
3423	err = xfrm_mark_put(skb, &x->mark);
3424	if (err)
3425		return err;
3426
3427	err = xfrm_if_id_put(skb, x->if_id);
3428	if (err)
3429		return err;
3430	if (x->pcpu_num != UINT_MAX) {
3431		err = nla_put_u32(skb, XFRMA_SA_PCPU, x->pcpu_num);
3432		if (err)
3433			return err;
3434	}
3435
3436	if (x->dir) {
3437		err = nla_put_u8(skb, XFRMA_SA_DIR, x->dir);
3438		if (err)
3439			return err;
3440	}
3441
3442	nlmsg_end(skb, nlh);
3443	return 0;
3444}
3445
3446static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
3447{
3448	struct net *net = xs_net(x);
3449	struct sk_buff *skb;
3450
3451	skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
3452	if (skb == NULL)
3453		return -ENOMEM;
3454
3455	if (build_expire(skb, x, c) < 0) {
3456		kfree_skb(skb);
3457		return -EMSGSIZE;
3458	}
3459
3460	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
3461}
3462
3463static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
3464{
3465	struct net *net = xs_net(x);
3466	struct sk_buff *skb;
3467	int err;
3468
3469	skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
3470	if (skb == NULL)
3471		return -ENOMEM;
3472
3473	err = build_aevent(skb, x, c);
3474	BUG_ON(err < 0);
3475
3476	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS);
3477}
3478
3479static int xfrm_notify_sa_flush(const struct km_event *c)
3480{
3481	struct net *net = c->net;
3482	struct xfrm_usersa_flush *p;
3483	struct nlmsghdr *nlh;
3484	struct sk_buff *skb;
3485	int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
3486
3487	skb = nlmsg_new(len, GFP_ATOMIC);
3488	if (skb == NULL)
3489		return -ENOMEM;
3490
3491	nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
3492	if (nlh == NULL) {
3493		kfree_skb(skb);
3494		return -EMSGSIZE;
3495	}
3496
3497	p = nlmsg_data(nlh);
3498	p->proto = c->data.proto;
3499
3500	nlmsg_end(skb, nlh);
3501
3502	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
3503}
3504
3505static inline unsigned int xfrm_sa_len(struct xfrm_state *x)
3506{
3507	unsigned int l = 0;
3508	if (x->aead)
3509		l += nla_total_size(aead_len(x->aead));
3510	if (x->aalg) {
3511		l += nla_total_size(sizeof(struct xfrm_algo) +
3512				    (x->aalg->alg_key_len + 7) / 8);
3513		l += nla_total_size(xfrm_alg_auth_len(x->aalg));
3514	}
3515	if (x->ealg)
3516		l += nla_total_size(xfrm_alg_len(x->ealg));
3517	if (x->calg)
3518		l += nla_total_size(sizeof(*x->calg));
3519	if (x->encap)
3520		l += nla_total_size(sizeof(*x->encap));
3521	if (x->tfcpad)
3522		l += nla_total_size(sizeof(x->tfcpad));
3523	if (x->replay_esn)
3524		l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
3525	else
3526		l += nla_total_size(sizeof(struct xfrm_replay_state));
3527	if (x->security)
3528		l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
3529				    x->security->ctx_len);
3530	if (x->coaddr)
3531		l += nla_total_size(sizeof(*x->coaddr));
3532	if (x->props.extra_flags)
3533		l += nla_total_size(sizeof(x->props.extra_flags));
3534	if (x->xso.dev)
3535		 l += nla_total_size(sizeof(struct xfrm_user_offload));
3536	if (x->props.smark.v | x->props.smark.m) {
3537		l += nla_total_size(sizeof(x->props.smark.v));
3538		l += nla_total_size(sizeof(x->props.smark.m));
3539	}
3540	if (x->if_id)
3541		l += nla_total_size(sizeof(x->if_id));
3542	if (x->pcpu_num)
3543		l += nla_total_size(sizeof(x->pcpu_num));
3544
3545	/* Must count x->lastused as it may become non-zero behind our back. */
3546	l += nla_total_size_64bit(sizeof(u64));
3547
3548	if (x->mapping_maxage)
3549		l += nla_total_size(sizeof(x->mapping_maxage));
3550
3551	if (x->dir)
3552		l += nla_total_size(sizeof(x->dir));
3553
3554	if (x->nat_keepalive_interval)
3555		l += nla_total_size(sizeof(x->nat_keepalive_interval));
3556
3557	return l;
3558}
3559
3560static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
3561{
3562	struct net *net = xs_net(x);
3563	struct xfrm_usersa_info *p;
3564	struct xfrm_usersa_id *id;
3565	struct nlmsghdr *nlh;
3566	struct sk_buff *skb;
3567	unsigned int len = xfrm_sa_len(x);
3568	unsigned int headlen;
3569	int err;
3570
3571	headlen = sizeof(*p);
3572	if (c->event == XFRM_MSG_DELSA) {
3573		len += nla_total_size(headlen);
3574		headlen = sizeof(*id);
3575		len += nla_total_size(sizeof(struct xfrm_mark));
3576	}
3577	len += NLMSG_ALIGN(headlen);
3578
3579	skb = nlmsg_new(len, GFP_ATOMIC);
3580	if (skb == NULL)
3581		return -ENOMEM;
3582
3583	nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
3584	err = -EMSGSIZE;
3585	if (nlh == NULL)
3586		goto out_free_skb;
3587
3588	p = nlmsg_data(nlh);
3589	if (c->event == XFRM_MSG_DELSA) {
3590		struct nlattr *attr;
3591
3592		id = nlmsg_data(nlh);
3593		memset(id, 0, sizeof(*id));
3594		memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
3595		id->spi = x->id.spi;
3596		id->family = x->props.family;
3597		id->proto = x->id.proto;
3598
3599		attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
3600		err = -EMSGSIZE;
3601		if (attr == NULL)
3602			goto out_free_skb;
3603
3604		p = nla_data(attr);
3605	}
3606	err = copy_to_user_state_extra(x, p, skb);
3607	if (err)
3608		goto out_free_skb;
3609
3610	nlmsg_end(skb, nlh);
3611
3612	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
3613
3614out_free_skb:
 
 
3615	kfree_skb(skb);
3616	return err;
3617}
3618
3619static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
3620{
3621
3622	switch (c->event) {
3623	case XFRM_MSG_EXPIRE:
3624		return xfrm_exp_state_notify(x, c);
3625	case XFRM_MSG_NEWAE:
3626		return xfrm_aevent_state_notify(x, c);
3627	case XFRM_MSG_DELSA:
3628	case XFRM_MSG_UPDSA:
3629	case XFRM_MSG_NEWSA:
3630		return xfrm_notify_sa(x, c);
3631	case XFRM_MSG_FLUSHSA:
3632		return xfrm_notify_sa_flush(c);
3633	default:
3634		printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
3635		       c->event);
3636		break;
3637	}
3638
3639	return 0;
3640
3641}
3642
3643static inline unsigned int xfrm_acquire_msgsize(struct xfrm_state *x,
3644						struct xfrm_policy *xp)
3645{
3646	return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
3647	       + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
3648	       + nla_total_size(sizeof(struct xfrm_mark))
3649	       + nla_total_size(xfrm_user_sec_ctx_size(x->security))
3650	       + nla_total_size(4) /* XFRMA_SA_PCPU */
3651	       + userpolicy_type_attrsize();
3652}
3653
3654static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
3655			 struct xfrm_tmpl *xt, struct xfrm_policy *xp)
 
3656{
3657	__u32 seq = xfrm_get_acqseq();
3658	struct xfrm_user_acquire *ua;
3659	struct nlmsghdr *nlh;
3660	int err;
3661
3662	nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
3663	if (nlh == NULL)
3664		return -EMSGSIZE;
3665
3666	ua = nlmsg_data(nlh);
3667	memcpy(&ua->id, &x->id, sizeof(ua->id));
3668	memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
3669	memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
3670	copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT);
3671	ua->aalgos = xt->aalgos;
3672	ua->ealgos = xt->ealgos;
3673	ua->calgos = xt->calgos;
3674	ua->seq = x->km.seq = seq;
3675
3676	err = copy_to_user_tmpl(xp, skb);
3677	if (!err)
3678		err = copy_to_user_state_sec_ctx(x, skb);
3679	if (!err)
3680		err = copy_to_user_policy_type(xp->type, skb);
3681	if (!err)
3682		err = xfrm_mark_put(skb, &xp->mark);
3683	if (!err)
3684		err = xfrm_if_id_put(skb, xp->if_id);
3685	if (!err && xp->xdo.dev)
3686		err = copy_user_offload(&xp->xdo, skb);
3687	if (!err && x->pcpu_num != UINT_MAX)
3688		err = nla_put_u32(skb, XFRMA_SA_PCPU, x->pcpu_num);
3689	if (err) {
3690		nlmsg_cancel(skb, nlh);
3691		return err;
3692	}
3693
3694	nlmsg_end(skb, nlh);
3695	return 0;
 
 
 
 
3696}
3697
3698static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
3699			     struct xfrm_policy *xp)
3700{
3701	struct net *net = xs_net(x);
3702	struct sk_buff *skb;
3703	int err;
3704
3705	skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
3706	if (skb == NULL)
3707		return -ENOMEM;
3708
3709	err = build_acquire(skb, x, xt, xp);
3710	BUG_ON(err < 0);
3711
3712	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE);
3713}
3714
3715/* User gives us xfrm_user_policy_info followed by an array of 0
3716 * or more templates.
3717 */
3718static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
3719					       u8 *data, int len, int *dir)
3720{
3721	struct net *net = sock_net(sk);
3722	struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
3723	struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
3724	struct xfrm_policy *xp;
3725	int nr;
3726
3727	switch (sk->sk_family) {
3728	case AF_INET:
3729		if (opt != IP_XFRM_POLICY) {
3730			*dir = -EOPNOTSUPP;
3731			return NULL;
3732		}
3733		break;
3734#if IS_ENABLED(CONFIG_IPV6)
3735	case AF_INET6:
3736		if (opt != IPV6_XFRM_POLICY) {
3737			*dir = -EOPNOTSUPP;
3738			return NULL;
3739		}
3740		break;
3741#endif
3742	default:
3743		*dir = -EINVAL;
3744		return NULL;
3745	}
3746
3747	*dir = -EINVAL;
3748
3749	if (len < sizeof(*p) ||
3750	    verify_newpolicy_info(p, NULL))
3751		return NULL;
3752
3753	nr = ((len - sizeof(*p)) / sizeof(*ut));
3754	if (validate_tmpl(nr, ut, p->sel.family, p->dir, NULL))
3755		return NULL;
3756
3757	if (p->dir > XFRM_POLICY_OUT)
3758		return NULL;
3759
3760	xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3761	if (xp == NULL) {
3762		*dir = -ENOBUFS;
3763		return NULL;
3764	}
3765
3766	copy_from_user_policy(xp, p);
3767	xp->type = XFRM_POLICY_TYPE_MAIN;
3768	copy_templates(xp, ut, nr);
3769
3770	*dir = p->dir;
3771
3772	return xp;
3773}
3774
3775static inline unsigned int xfrm_polexpire_msgsize(struct xfrm_policy *xp)
3776{
3777	return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
3778	       + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
3779	       + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
3780	       + nla_total_size(sizeof(struct xfrm_mark))
3781	       + userpolicy_type_attrsize();
3782}
3783
3784static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
3785			   int dir, const struct km_event *c)
3786{
3787	struct xfrm_user_polexpire *upe;
3788	int hard = c->data.hard;
3789	struct nlmsghdr *nlh;
3790	int err;
3791
3792	nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
3793	if (nlh == NULL)
3794		return -EMSGSIZE;
3795
3796	upe = nlmsg_data(nlh);
3797	copy_to_user_policy(xp, &upe->pol, dir);
3798	err = copy_to_user_tmpl(xp, skb);
3799	if (!err)
3800		err = copy_to_user_sec_ctx(xp, skb);
3801	if (!err)
3802		err = copy_to_user_policy_type(xp->type, skb);
3803	if (!err)
3804		err = xfrm_mark_put(skb, &xp->mark);
3805	if (!err)
3806		err = xfrm_if_id_put(skb, xp->if_id);
3807	if (!err && xp->xdo.dev)
3808		err = copy_user_offload(&xp->xdo, skb);
3809	if (err) {
3810		nlmsg_cancel(skb, nlh);
3811		return err;
3812	}
3813	upe->hard = !!hard;
3814
3815	nlmsg_end(skb, nlh);
3816	return 0;
 
 
 
 
3817}
3818
3819static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3820{
3821	struct net *net = xp_net(xp);
3822	struct sk_buff *skb;
3823	int err;
3824
3825	skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
3826	if (skb == NULL)
3827		return -ENOMEM;
3828
3829	err = build_polexpire(skb, xp, dir, c);
3830	BUG_ON(err < 0);
3831
3832	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
3833}
3834
3835static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
3836{
3837	unsigned int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
3838	struct net *net = xp_net(xp);
3839	struct xfrm_userpolicy_info *p;
3840	struct xfrm_userpolicy_id *id;
3841	struct nlmsghdr *nlh;
3842	struct sk_buff *skb;
3843	unsigned int headlen;
3844	int err;
3845
3846	headlen = sizeof(*p);
3847	if (c->event == XFRM_MSG_DELPOLICY) {
3848		len += nla_total_size(headlen);
3849		headlen = sizeof(*id);
3850	}
3851	len += userpolicy_type_attrsize();
3852	len += nla_total_size(sizeof(struct xfrm_mark));
3853	len += NLMSG_ALIGN(headlen);
3854
3855	skb = nlmsg_new(len, GFP_ATOMIC);
3856	if (skb == NULL)
3857		return -ENOMEM;
3858
3859	nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
3860	err = -EMSGSIZE;
3861	if (nlh == NULL)
3862		goto out_free_skb;
3863
3864	p = nlmsg_data(nlh);
3865	if (c->event == XFRM_MSG_DELPOLICY) {
3866		struct nlattr *attr;
3867
3868		id = nlmsg_data(nlh);
3869		memset(id, 0, sizeof(*id));
3870		id->dir = dir;
3871		if (c->data.byid)
3872			id->index = xp->index;
3873		else
3874			memcpy(&id->sel, &xp->selector, sizeof(id->sel));
3875
3876		attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
3877		err = -EMSGSIZE;
3878		if (attr == NULL)
3879			goto out_free_skb;
3880
3881		p = nla_data(attr);
3882	}
3883
3884	copy_to_user_policy(xp, p, dir);
3885	err = copy_to_user_tmpl(xp, skb);
3886	if (!err)
3887		err = copy_to_user_policy_type(xp->type, skb);
3888	if (!err)
3889		err = xfrm_mark_put(skb, &xp->mark);
3890	if (!err)
3891		err = xfrm_if_id_put(skb, xp->if_id);
3892	if (!err && xp->xdo.dev)
3893		err = copy_user_offload(&xp->xdo, skb);
3894	if (err)
3895		goto out_free_skb;
3896
3897	nlmsg_end(skb, nlh);
3898
3899	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
3900
3901out_free_skb:
 
3902	kfree_skb(skb);
3903	return err;
3904}
3905
3906static int xfrm_notify_policy_flush(const struct km_event *c)
3907{
3908	struct net *net = c->net;
3909	struct nlmsghdr *nlh;
3910	struct sk_buff *skb;
3911	int err;
3912
3913	skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
3914	if (skb == NULL)
3915		return -ENOMEM;
3916
3917	nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
3918	err = -EMSGSIZE;
3919	if (nlh == NULL)
3920		goto out_free_skb;
3921	err = copy_to_user_policy_type(c->data.type, skb);
3922	if (err)
3923		goto out_free_skb;
3924
3925	nlmsg_end(skb, nlh);
3926
3927	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
3928
3929out_free_skb:
3930	kfree_skb(skb);
3931	return err;
3932}
3933
3934static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3935{
3936
3937	switch (c->event) {
3938	case XFRM_MSG_NEWPOLICY:
3939	case XFRM_MSG_UPDPOLICY:
3940	case XFRM_MSG_DELPOLICY:
3941		return xfrm_notify_policy(xp, dir, c);
3942	case XFRM_MSG_FLUSHPOLICY:
3943		return xfrm_notify_policy_flush(c);
3944	case XFRM_MSG_POLEXPIRE:
3945		return xfrm_exp_policy_notify(xp, dir, c);
3946	default:
3947		printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
3948		       c->event);
3949	}
3950
3951	return 0;
3952
3953}
3954
3955static inline unsigned int xfrm_report_msgsize(void)
3956{
3957	return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
3958}
3959
3960static int build_report(struct sk_buff *skb, u8 proto,
3961			struct xfrm_selector *sel, xfrm_address_t *addr)
3962{
3963	struct xfrm_user_report *ur;
3964	struct nlmsghdr *nlh;
3965
3966	nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
3967	if (nlh == NULL)
3968		return -EMSGSIZE;
3969
3970	ur = nlmsg_data(nlh);
3971	ur->proto = proto;
3972	memcpy(&ur->sel, sel, sizeof(ur->sel));
3973
3974	if (addr) {
3975		int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr);
3976		if (err) {
3977			nlmsg_cancel(skb, nlh);
3978			return err;
3979		}
3980	}
3981	nlmsg_end(skb, nlh);
3982	return 0;
3983}
3984
3985static int xfrm_send_report(struct net *net, u8 proto,
3986			    struct xfrm_selector *sel, xfrm_address_t *addr)
3987{
3988	struct sk_buff *skb;
3989	int err;
3990
3991	skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
3992	if (skb == NULL)
3993		return -ENOMEM;
3994
3995	err = build_report(skb, proto, sel, addr);
3996	BUG_ON(err < 0);
3997
3998	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT);
3999}
4000
4001static inline unsigned int xfrm_mapping_msgsize(void)
4002{
4003	return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
4004}
4005
4006static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
4007			 xfrm_address_t *new_saddr, __be16 new_sport)
4008{
4009	struct xfrm_user_mapping *um;
4010	struct nlmsghdr *nlh;
4011
4012	nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
4013	if (nlh == NULL)
4014		return -EMSGSIZE;
4015
4016	um = nlmsg_data(nlh);
4017
4018	memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
4019	um->id.spi = x->id.spi;
4020	um->id.family = x->props.family;
4021	um->id.proto = x->id.proto;
4022	memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
4023	memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
4024	um->new_sport = new_sport;
4025	um->old_sport = x->encap->encap_sport;
4026	um->reqid = x->props.reqid;
4027
4028	nlmsg_end(skb, nlh);
4029	return 0;
4030}
4031
4032static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
4033			     __be16 sport)
4034{
4035	struct net *net = xs_net(x);
4036	struct sk_buff *skb;
4037	int err;
4038
4039	if (x->id.proto != IPPROTO_ESP)
4040		return -EINVAL;
4041
4042	if (!x->encap)
4043		return -EINVAL;
4044
4045	skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
4046	if (skb == NULL)
4047		return -ENOMEM;
4048
4049	err = build_mapping(skb, x, ipaddr, sport);
4050	BUG_ON(err < 0);
4051
4052	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING);
4053}
4054
4055static bool xfrm_is_alive(const struct km_event *c)
4056{
4057	return (bool)xfrm_acquire_is_on(c->net);
4058}
4059
4060static struct xfrm_mgr netlink_mgr = {
 
4061	.notify		= xfrm_send_state_notify,
4062	.acquire	= xfrm_send_acquire,
4063	.compile_policy	= xfrm_compile_policy,
4064	.notify_policy	= xfrm_send_policy_notify,
4065	.report		= xfrm_send_report,
4066	.migrate	= xfrm_send_migrate,
4067	.new_mapping	= xfrm_send_mapping,
4068	.is_alive	= xfrm_is_alive,
4069};
4070
4071static int __net_init xfrm_user_net_init(struct net *net)
4072{
4073	struct sock *nlsk;
4074	struct netlink_kernel_cfg cfg = {
4075		.groups	= XFRMNLGRP_MAX,
4076		.input	= xfrm_netlink_rcv,
4077	};
4078
4079	nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg);
 
4080	if (nlsk == NULL)
4081		return -ENOMEM;
4082	net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
4083	rcu_assign_pointer(net->xfrm.nlsk, nlsk);
4084	return 0;
4085}
4086
4087static void __net_exit xfrm_user_net_pre_exit(struct net *net)
4088{
4089	RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
4090}
4091
4092static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
4093{
4094	struct net *net;
4095
 
 
4096	list_for_each_entry(net, net_exit_list, exit_list)
4097		netlink_kernel_release(net->xfrm.nlsk_stash);
4098}
4099
4100static struct pernet_operations xfrm_user_net_ops = {
4101	.init	    = xfrm_user_net_init,
4102	.pre_exit   = xfrm_user_net_pre_exit,
4103	.exit_batch = xfrm_user_net_exit,
4104};
4105
4106static int __init xfrm_user_init(void)
4107{
4108	int rv;
4109
4110	printk(KERN_INFO "Initializing XFRM netlink socket\n");
4111
4112	rv = register_pernet_subsys(&xfrm_user_net_ops);
4113	if (rv < 0)
4114		return rv;
4115	xfrm_register_km(&netlink_mgr);
4116	return 0;
 
 
4117}
4118
4119static void __exit xfrm_user_exit(void)
4120{
4121	xfrm_unregister_km(&netlink_mgr);
4122	unregister_pernet_subsys(&xfrm_user_net_ops);
4123}
4124
4125module_init(xfrm_user_init);
4126module_exit(xfrm_user_exit);
4127MODULE_DESCRIPTION("XFRM User interface");
4128MODULE_LICENSE("GPL");
4129MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);