1/* xfrm_user.c: User interface to configure xfrm engine.
   2 *
   3 * Copyright (C) 2002 David S. Miller (davem@redhat.com)
   4 *
   5 * Changes:
   6 *	Mitsuru KANDA @USAGI
   7 * 	Kazunori MIYAZAWA @USAGI
   8 * 	Kunihiro Ishiguro <kunihiro@ipinfusion.com>
   9 * 		IPv6 support
  10 *
  11 */
  12
  13#include <linux/crypto.h>
  14#include <linux/module.h>
  15#include <linux/kernel.h>
  16#include <linux/types.h>
  17#include <linux/slab.h>
  18#include <linux/socket.h>
  19#include <linux/string.h>
  20#include <linux/net.h>
  21#include <linux/skbuff.h>
  22#include <linux/pfkeyv2.h>
  23#include <linux/ipsec.h>
  24#include <linux/init.h>
  25#include <linux/security.h>
  26#include <net/sock.h>
  27#include <net/xfrm.h>
  28#include <net/netlink.h>
  29#include <net/ah.h>
  30#include <asm/uaccess.h>
  31#if IS_ENABLED(CONFIG_IPV6)
  32#include <linux/in6.h>
  33#endif
  34
  35static inline int aead_len(struct xfrm_algo_aead *alg)
  36{
  37	return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
  38}
  39
  40static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type)
  41{
  42	struct nlattr *rt = attrs[type];
  43	struct xfrm_algo *algp;
  44
  45	if (!rt)
  46		return 0;
  47
  48	algp = nla_data(rt);
  49	if (nla_len(rt) < xfrm_alg_len(algp))
  50		return -EINVAL;
  51
  52	switch (type) {
  53	case XFRMA_ALG_AUTH:
  54	case XFRMA_ALG_CRYPT:
  55	case XFRMA_ALG_COMP:
  56		break;
  57
  58	default:
  59		return -EINVAL;
  60	}
  61
  62	algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
  63	return 0;
  64}
  65
  66static int verify_auth_trunc(struct nlattr **attrs)
  67{
  68	struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC];
  69	struct xfrm_algo_auth *algp;
  70
  71	if (!rt)
  72		return 0;
  73
  74	algp = nla_data(rt);
  75	if (nla_len(rt) < xfrm_alg_auth_len(algp))
  76		return -EINVAL;
  77
  78	algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
  79	return 0;
  80}
  81
  82static int verify_aead(struct nlattr **attrs)
  83{
  84	struct nlattr *rt = attrs[XFRMA_ALG_AEAD];
  85	struct xfrm_algo_aead *algp;
  86
  87	if (!rt)
  88		return 0;
  89
  90	algp = nla_data(rt);
  91	if (nla_len(rt) < aead_len(algp))
  92		return -EINVAL;
  93
  94	algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
  95	return 0;
  96}
  97
  98static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type,
  99			   xfrm_address_t **addrp)
 100{
 101	struct nlattr *rt = attrs[type];
 102
 103	if (rt && addrp)
 104		*addrp = nla_data(rt);
 105}
 106
 107static inline int verify_sec_ctx_len(struct nlattr **attrs)
 108{
 109	struct nlattr *rt = attrs[XFRMA_SEC_CTX];
 110	struct xfrm_user_sec_ctx *uctx;
 111
 112	if (!rt)
 113		return 0;
 114
 115	uctx = nla_data(rt);
 116	if (uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len))
 117		return -EINVAL;
 118
 119	return 0;
 120}
 121
 122static inline int verify_replay(struct xfrm_usersa_info *p,
 123				struct nlattr **attrs)
 124{
 125	struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL];
 
 126
 127	if ((p->flags & XFRM_STATE_ESN) && !rt)
 128		return -EINVAL;
 
 
 
 
 
 
 
 
 
 
 
 129
 130	if (!rt)
 131		return 0;
 132
 133	if (p->id.proto != IPPROTO_ESP)
 
 134		return -EINVAL;
 135
 136	if (p->replay_window != 0)
 137		return -EINVAL;
 138
 139	return 0;
 140}
 141
 142static int verify_newsa_info(struct xfrm_usersa_info *p,
 143			     struct nlattr **attrs)
 144{
 145	int err;
 146
 147	err = -EINVAL;
 148	switch (p->family) {
 149	case AF_INET:
 150		break;
 151
 152	case AF_INET6:
 153#if IS_ENABLED(CONFIG_IPV6)
 154		break;
 155#else
 156		err = -EAFNOSUPPORT;
 157		goto out;
 158#endif
 159
 160	default:
 161		goto out;
 162	}
 163
 164	err = -EINVAL;
 165	switch (p->id.proto) {
 166	case IPPROTO_AH:
 167		if ((!attrs[XFRMA_ALG_AUTH]	&&
 168		     !attrs[XFRMA_ALG_AUTH_TRUNC]) ||
 169		    attrs[XFRMA_ALG_AEAD]	||
 170		    attrs[XFRMA_ALG_CRYPT]	||
 171		    attrs[XFRMA_ALG_COMP]	||
 172		    attrs[XFRMA_TFCPAD])
 
 
 173			goto out;
 174		break;
 175
 176	case IPPROTO_ESP:
 177		if (attrs[XFRMA_ALG_COMP])
 178			goto out;
 179		if (!attrs[XFRMA_ALG_AUTH] &&
 180		    !attrs[XFRMA_ALG_AUTH_TRUNC] &&
 181		    !attrs[XFRMA_ALG_CRYPT] &&
 182		    !attrs[XFRMA_ALG_AEAD])
 183			goto out;
 184		if ((attrs[XFRMA_ALG_AUTH] ||
 185		     attrs[XFRMA_ALG_AUTH_TRUNC] ||
 186		     attrs[XFRMA_ALG_CRYPT]) &&
 187		    attrs[XFRMA_ALG_AEAD])
 188			goto out;
 189		if (attrs[XFRMA_TFCPAD] &&
 190		    p->mode != XFRM_MODE_TUNNEL)
 191			goto out;
 192		break;
 193
 194	case IPPROTO_COMP:
 195		if (!attrs[XFRMA_ALG_COMP]	||
 196		    attrs[XFRMA_ALG_AEAD]	||
 197		    attrs[XFRMA_ALG_AUTH]	||
 198		    attrs[XFRMA_ALG_AUTH_TRUNC]	||
 199		    attrs[XFRMA_ALG_CRYPT]	||
 200		    attrs[XFRMA_TFCPAD])
 201			goto out;
 202		break;
 203
 204#if IS_ENABLED(CONFIG_IPV6)
 205	case IPPROTO_DSTOPTS:
 206	case IPPROTO_ROUTING:
 207		if (attrs[XFRMA_ALG_COMP]	||
 208		    attrs[XFRMA_ALG_AUTH]	||
 209		    attrs[XFRMA_ALG_AUTH_TRUNC]	||
 210		    attrs[XFRMA_ALG_AEAD]	||
 211		    attrs[XFRMA_ALG_CRYPT]	||
 212		    attrs[XFRMA_ENCAP]		||
 213		    attrs[XFRMA_SEC_CTX]	||
 214		    attrs[XFRMA_TFCPAD]		||
 215		    !attrs[XFRMA_COADDR])
 216			goto out;
 217		break;
 218#endif
 219
 220	default:
 221		goto out;
 222	}
 223
 224	if ((err = verify_aead(attrs)))
 225		goto out;
 226	if ((err = verify_auth_trunc(attrs)))
 227		goto out;
 228	if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH)))
 229		goto out;
 230	if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT)))
 231		goto out;
 232	if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP)))
 233		goto out;
 234	if ((err = verify_sec_ctx_len(attrs)))
 235		goto out;
 236	if ((err = verify_replay(p, attrs)))
 237		goto out;
 238
 239	err = -EINVAL;
 240	switch (p->mode) {
 241	case XFRM_MODE_TRANSPORT:
 242	case XFRM_MODE_TUNNEL:
 243	case XFRM_MODE_ROUTEOPTIMIZATION:
 244	case XFRM_MODE_BEET:
 245		break;
 246
 247	default:
 248		goto out;
 249	}
 250
 251	err = 0;
 252
 253out:
 254	return err;
 255}
 256
 257static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
 258			   struct xfrm_algo_desc *(*get_byname)(const char *, int),
 259			   struct nlattr *rta)
 260{
 261	struct xfrm_algo *p, *ualg;
 262	struct xfrm_algo_desc *algo;
 263
 264	if (!rta)
 265		return 0;
 266
 267	ualg = nla_data(rta);
 268
 269	algo = get_byname(ualg->alg_name, 1);
 270	if (!algo)
 271		return -ENOSYS;
 272	*props = algo->desc.sadb_alg_id;
 273
 274	p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
 275	if (!p)
 276		return -ENOMEM;
 277
 278	strcpy(p->alg_name, algo->name);
 279	*algpp = p;
 280	return 0;
 281}
 282
 283static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,
 284		       struct nlattr *rta)
 285{
 286	struct xfrm_algo *ualg;
 287	struct xfrm_algo_auth *p;
 288	struct xfrm_algo_desc *algo;
 289
 290	if (!rta)
 291		return 0;
 292
 293	ualg = nla_data(rta);
 294
 295	algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
 296	if (!algo)
 297		return -ENOSYS;
 298	*props = algo->desc.sadb_alg_id;
 299
 300	p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL);
 301	if (!p)
 302		return -ENOMEM;
 303
 304	strcpy(p->alg_name, algo->name);
 305	p->alg_key_len = ualg->alg_key_len;
 306	p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
 307	memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8);
 308
 309	*algpp = p;
 310	return 0;
 311}
 312
 313static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,
 314			     struct nlattr *rta)
 315{
 316	struct xfrm_algo_auth *p, *ualg;
 317	struct xfrm_algo_desc *algo;
 318
 319	if (!rta)
 320		return 0;
 321
 322	ualg = nla_data(rta);
 323
 324	algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
 325	if (!algo)
 326		return -ENOSYS;
 327	if ((ualg->alg_trunc_len / 8) > MAX_AH_AUTH_LEN ||
 328	    ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits)
 329		return -EINVAL;
 330	*props = algo->desc.sadb_alg_id;
 331
 332	p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);
 333	if (!p)
 334		return -ENOMEM;
 335
 336	strcpy(p->alg_name, algo->name);
 337	if (!p->alg_trunc_len)
 338		p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
 339
 340	*algpp = p;
 341	return 0;
 342}
 343
 344static int attach_aead(struct xfrm_algo_aead **algpp, u8 *props,
 345		       struct nlattr *rta)
 346{
 347	struct xfrm_algo_aead *p, *ualg;
 348	struct xfrm_algo_desc *algo;
 349
 350	if (!rta)
 351		return 0;
 352
 353	ualg = nla_data(rta);
 354
 355	algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
 356	if (!algo)
 357		return -ENOSYS;
 358	*props = algo->desc.sadb_alg_id;
 359
 360	p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
 361	if (!p)
 362		return -ENOMEM;
 363
 364	strcpy(p->alg_name, algo->name);
 365	*algpp = p;
 366	return 0;
 367}
 368
 369static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn,
 370					 struct nlattr *rp)
 371{
 372	struct xfrm_replay_state_esn *up;
 
 373
 374	if (!replay_esn || !rp)
 375		return 0;
 376
 377	up = nla_data(rp);
 
 378
 379	if (xfrm_replay_state_esn_len(replay_esn) !=
 380			xfrm_replay_state_esn_len(up))
 381		return -EINVAL;
 382
 383	return 0;
 384}
 385
 386static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,
 387				       struct xfrm_replay_state_esn **preplay_esn,
 388				       struct nlattr *rta)
 389{
 390	struct xfrm_replay_state_esn *p, *pp, *up;
 
 391
 392	if (!rta)
 393		return 0;
 394
 395	up = nla_data(rta);
 
 
 396
 397	p = kmemdup(up, xfrm_replay_state_esn_len(up), GFP_KERNEL);
 398	if (!p)
 399		return -ENOMEM;
 400
 401	pp = kmemdup(up, xfrm_replay_state_esn_len(up), GFP_KERNEL);
 402	if (!pp) {
 403		kfree(p);
 404		return -ENOMEM;
 405	}
 406
 
 
 
 407	*replay_esn = p;
 408	*preplay_esn = pp;
 409
 410	return 0;
 411}
 412
 413static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
 414{
 415	int len = 0;
 416
 417	if (xfrm_ctx) {
 418		len += sizeof(struct xfrm_user_sec_ctx);
 419		len += xfrm_ctx->ctx_len;
 420	}
 421	return len;
 422}
 423
 424static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
 425{
 426	memcpy(&x->id, &p->id, sizeof(x->id));
 427	memcpy(&x->sel, &p->sel, sizeof(x->sel));
 428	memcpy(&x->lft, &p->lft, sizeof(x->lft));
 429	x->props.mode = p->mode;
 430	x->props.replay_window = p->replay_window;
 
 431	x->props.reqid = p->reqid;
 432	x->props.family = p->family;
 433	memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
 434	x->props.flags = p->flags;
 435
 436	if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
 437		x->sel.family = p->family;
 438}
 439
 440/*
 441 * someday when pfkey also has support, we could have the code
 442 * somehow made shareable and move it to xfrm_state.c - JHS
 443 *
 444*/
 445static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs)
 
 446{
 447	struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
 448	struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
 449	struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
 450	struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
 451	struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
 452
 453	if (re) {
 454		struct xfrm_replay_state_esn *replay_esn;
 455		replay_esn = nla_data(re);
 456		memcpy(x->replay_esn, replay_esn,
 457		       xfrm_replay_state_esn_len(replay_esn));
 458		memcpy(x->preplay_esn, replay_esn,
 459		       xfrm_replay_state_esn_len(replay_esn));
 460	}
 461
 462	if (rp) {
 463		struct xfrm_replay_state *replay;
 464		replay = nla_data(rp);
 465		memcpy(&x->replay, replay, sizeof(*replay));
 466		memcpy(&x->preplay, replay, sizeof(*replay));
 467	}
 468
 469	if (lt) {
 470		struct xfrm_lifetime_cur *ltime;
 471		ltime = nla_data(lt);
 472		x->curlft.bytes = ltime->bytes;
 473		x->curlft.packets = ltime->packets;
 474		x->curlft.add_time = ltime->add_time;
 475		x->curlft.use_time = ltime->use_time;
 476	}
 477
 478	if (et)
 479		x->replay_maxage = nla_get_u32(et);
 480
 481	if (rt)
 482		x->replay_maxdiff = nla_get_u32(rt);
 483}
 484
 485static struct xfrm_state *xfrm_state_construct(struct net *net,
 486					       struct xfrm_usersa_info *p,
 487					       struct nlattr **attrs,
 488					       int *errp)
 489{
 490	struct xfrm_state *x = xfrm_state_alloc(net);
 491	int err = -ENOMEM;
 492
 493	if (!x)
 494		goto error_no_put;
 495
 496	copy_from_user_state(x, p);
 497
 
 
 
 498	if ((err = attach_aead(&x->aead, &x->props.ealgo,
 499			       attrs[XFRMA_ALG_AEAD])))
 500		goto error;
 501	if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
 502				     attrs[XFRMA_ALG_AUTH_TRUNC])))
 503		goto error;
 504	if (!x->props.aalgo) {
 505		if ((err = attach_auth(&x->aalg, &x->props.aalgo,
 506				       attrs[XFRMA_ALG_AUTH])))
 507			goto error;
 508	}
 509	if ((err = attach_one_algo(&x->ealg, &x->props.ealgo,
 510				   xfrm_ealg_get_byname,
 511				   attrs[XFRMA_ALG_CRYPT])))
 512		goto error;
 513	if ((err = attach_one_algo(&x->calg, &x->props.calgo,
 514				   xfrm_calg_get_byname,
 515				   attrs[XFRMA_ALG_COMP])))
 516		goto error;
 517
 518	if (attrs[XFRMA_ENCAP]) {
 519		x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
 520				   sizeof(*x->encap), GFP_KERNEL);
 521		if (x->encap == NULL)
 522			goto error;
 523	}
 524
 525	if (attrs[XFRMA_TFCPAD])
 526		x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);
 527
 528	if (attrs[XFRMA_COADDR]) {
 529		x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
 530				    sizeof(*x->coaddr), GFP_KERNEL);
 531		if (x->coaddr == NULL)
 532			goto error;
 533	}
 534
 535	xfrm_mark_get(attrs, &x->mark);
 536
 537	err = __xfrm_init_state(x, false);
 538	if (err)
 539		goto error;
 540
 541	if (attrs[XFRMA_SEC_CTX] &&
 542	    security_xfrm_state_alloc(x, nla_data(attrs[XFRMA_SEC_CTX])))
 543		goto error;
 544
 545	if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn,
 546					       attrs[XFRMA_REPLAY_ESN_VAL])))
 547		goto error;
 548
 549	x->km.seq = p->seq;
 550	x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
 551	/* sysctl_xfrm_aevent_etime is in 100ms units */
 552	x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
 553
 554	if ((err = xfrm_init_replay(x)))
 555		goto error;
 556
 557	/* override default values from above */
 558	xfrm_update_ae_params(x, attrs);
 559
 560	return x;
 561
 562error:
 563	x->km.state = XFRM_STATE_DEAD;
 564	xfrm_state_put(x);
 565error_no_put:
 566	*errp = err;
 567	return NULL;
 568}
 569
 570static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
 571		struct nlattr **attrs)
 572{
 573	struct net *net = sock_net(skb->sk);
 574	struct xfrm_usersa_info *p = nlmsg_data(nlh);
 575	struct xfrm_state *x;
 576	int err;
 577	struct km_event c;
 578	uid_t loginuid = audit_get_loginuid(current);
 579	u32 sessionid = audit_get_sessionid(current);
 580	u32 sid;
 581
 582	err = verify_newsa_info(p, attrs);
 583	if (err)
 584		return err;
 585
 586	x = xfrm_state_construct(net, p, attrs, &err);
 587	if (!x)
 588		return err;
 589
 590	xfrm_state_hold(x);
 591	if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
 592		err = xfrm_state_add(x);
 593	else
 594		err = xfrm_state_update(x);
 595
 596	security_task_getsecid(current, &sid);
 597	xfrm_audit_state_add(x, err ? 0 : 1, loginuid, sessionid, sid);
 598
 599	if (err < 0) {
 600		x->km.state = XFRM_STATE_DEAD;
 601		__xfrm_state_put(x);
 602		goto out;
 603	}
 604
 605	c.seq = nlh->nlmsg_seq;
 606	c.pid = nlh->nlmsg_pid;
 607	c.event = nlh->nlmsg_type;
 608
 609	km_state_notify(x, &c);
 610out:
 611	xfrm_state_put(x);
 612	return err;
 613}
 614
 615static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
 616						 struct xfrm_usersa_id *p,
 617						 struct nlattr **attrs,
 618						 int *errp)
 619{
 620	struct xfrm_state *x = NULL;
 621	struct xfrm_mark m;
 622	int err;
 623	u32 mark = xfrm_mark_get(attrs, &m);
 624
 625	if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
 626		err = -ESRCH;
 627		x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);
 628	} else {
 629		xfrm_address_t *saddr = NULL;
 630
 631		verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
 632		if (!saddr) {
 633			err = -EINVAL;
 634			goto out;
 635		}
 636
 637		err = -ESRCH;
 638		x = xfrm_state_lookup_byaddr(net, mark,
 639					     &p->daddr, saddr,
 640					     p->proto, p->family);
 641	}
 642
 643 out:
 644	if (!x && errp)
 645		*errp = err;
 646	return x;
 647}
 648
 649static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
 650		struct nlattr **attrs)
 651{
 652	struct net *net = sock_net(skb->sk);
 653	struct xfrm_state *x;
 654	int err = -ESRCH;
 655	struct km_event c;
 656	struct xfrm_usersa_id *p = nlmsg_data(nlh);
 657	uid_t loginuid = audit_get_loginuid(current);
 658	u32 sessionid = audit_get_sessionid(current);
 659	u32 sid;
 660
 661	x = xfrm_user_state_lookup(net, p, attrs, &err);
 662	if (x == NULL)
 663		return err;
 664
 665	if ((err = security_xfrm_state_delete(x)) != 0)
 666		goto out;
 667
 668	if (xfrm_state_kern(x)) {
 669		err = -EPERM;
 670		goto out;
 671	}
 672
 673	err = xfrm_state_delete(x);
 674
 675	if (err < 0)
 676		goto out;
 677
 678	c.seq = nlh->nlmsg_seq;
 679	c.pid = nlh->nlmsg_pid;
 680	c.event = nlh->nlmsg_type;
 681	km_state_notify(x, &c);
 682
 683out:
 684	security_task_getsecid(current, &sid);
 685	xfrm_audit_state_delete(x, err ? 0 : 1, loginuid, sessionid, sid);
 686	xfrm_state_put(x);
 687	return err;
 688}
 689
 690static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
 691{
 
 692	memcpy(&p->id, &x->id, sizeof(p->id));
 693	memcpy(&p->sel, &x->sel, sizeof(p->sel));
 694	memcpy(&p->lft, &x->lft, sizeof(p->lft));
 695	memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
 696	memcpy(&p->stats, &x->stats, sizeof(p->stats));
 697	memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
 698	p->mode = x->props.mode;
 699	p->replay_window = x->props.replay_window;
 700	p->reqid = x->props.reqid;
 701	p->family = x->props.family;
 702	p->flags = x->props.flags;
 703	p->seq = x->km.seq;
 704}
 705
 706struct xfrm_dump_info {
 707	struct sk_buff *in_skb;
 708	struct sk_buff *out_skb;
 709	u32 nlmsg_seq;
 710	u16 nlmsg_flags;
 711};
 712
 713static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
 714{
 715	struct xfrm_user_sec_ctx *uctx;
 716	struct nlattr *attr;
 717	int ctx_size = sizeof(*uctx) + s->ctx_len;
 718
 719	attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
 720	if (attr == NULL)
 721		return -EMSGSIZE;
 722
 723	uctx = nla_data(attr);
 724	uctx->exttype = XFRMA_SEC_CTX;
 725	uctx->len = ctx_size;
 726	uctx->ctx_doi = s->ctx_doi;
 727	uctx->ctx_alg = s->ctx_alg;
 728	uctx->ctx_len = s->ctx_len;
 729	memcpy(uctx + 1, s->ctx_str, s->ctx_len);
 730
 731	return 0;
 732}
 733
 734static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
 735{
 736	struct xfrm_algo *algo;
 737	struct nlattr *nla;
 738
 739	nla = nla_reserve(skb, XFRMA_ALG_AUTH,
 740			  sizeof(*algo) + (auth->alg_key_len + 7) / 8);
 741	if (!nla)
 742		return -EMSGSIZE;
 743
 744	algo = nla_data(nla);
 745	strcpy(algo->alg_name, auth->alg_name);
 746	memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8);
 747	algo->alg_key_len = auth->alg_key_len;
 748
 749	return 0;
 750}
 751
 752/* Don't change this without updating xfrm_sa_len! */
 753static int copy_to_user_state_extra(struct xfrm_state *x,
 754				    struct xfrm_usersa_info *p,
 755				    struct sk_buff *skb)
 756{
 757	copy_to_user_state(x, p);
 758
 759	if (x->coaddr &&
 760	    nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr))
 761		goto nla_put_failure;
 762
 763	if (x->lastused &&
 764	    nla_put_u64(skb, XFRMA_LASTUSED, x->lastused))
 765		goto nla_put_failure;
 766
 767	if (x->aead &&
 768	    nla_put(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead))
 769		goto nla_put_failure;
 770
 771	if (x->aalg &&
 772	    (copy_to_user_auth(x->aalg, skb) ||
 773	     nla_put(skb, XFRMA_ALG_AUTH_TRUNC,
 774		     xfrm_alg_auth_len(x->aalg), x->aalg)))
 775		goto nla_put_failure;
 776
 777	if (x->ealg &&
 778	    nla_put(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg))
 779		goto nla_put_failure;
 780
 781	if (x->calg &&
 782	    nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg))
 783		goto nla_put_failure;
 784
 785	if (x->encap &&
 786	    nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap))
 787		goto nla_put_failure;
 788
 789	if (x->tfcpad &&
 790	    nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad))
 791		goto nla_put_failure;
 792
 793	if (xfrm_mark_put(skb, &x->mark))
 794		goto nla_put_failure;
 795
 796	if (x->replay_esn &&
 797	    nla_put(skb, XFRMA_REPLAY_ESN_VAL,
 798		    xfrm_replay_state_esn_len(x->replay_esn),
 799		    x->replay_esn))
 800		goto nla_put_failure;
 801
 802	if (x->security && copy_sec_ctx(x->security, skb))
 803		goto nla_put_failure;
 804
 805	return 0;
 
 
 
 
 
 806
 807nla_put_failure:
 808	return -EMSGSIZE;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 809}
 810
 811static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
 812{
 813	struct xfrm_dump_info *sp = ptr;
 814	struct sk_buff *in_skb = sp->in_skb;
 815	struct sk_buff *skb = sp->out_skb;
 816	struct xfrm_usersa_info *p;
 817	struct nlmsghdr *nlh;
 818	int err;
 819
 820	nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq,
 821			XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
 822	if (nlh == NULL)
 823		return -EMSGSIZE;
 824
 825	p = nlmsg_data(nlh);
 826
 827	err = copy_to_user_state_extra(x, p, skb);
 828	if (err)
 829		goto nla_put_failure;
 830
 
 831	nlmsg_end(skb, nlh);
 832	return 0;
 833
 834nla_put_failure:
 835	nlmsg_cancel(skb, nlh);
 836	return err;
 837}
 838
 839static int xfrm_dump_sa_done(struct netlink_callback *cb)
 840{
 841	struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
 842	xfrm_state_walk_done(walk);
 
 
 
 843	return 0;
 844}
 845
 
 846static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
 847{
 848	struct net *net = sock_net(skb->sk);
 849	struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
 850	struct xfrm_dump_info info;
 851
 852	BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
 853		     sizeof(cb->args) - sizeof(cb->args[0]));
 854
 855	info.in_skb = cb->skb;
 856	info.out_skb = skb;
 857	info.nlmsg_seq = cb->nlh->nlmsg_seq;
 858	info.nlmsg_flags = NLM_F_MULTI;
 859
 860	if (!cb->args[0]) {
 
 
 
 
 
 861		cb->args[0] = 1;
 862		xfrm_state_walk_init(walk, 0);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 863	}
 864
 865	(void) xfrm_state_walk(net, walk, dump_one_state, &info);
 866
 867	return skb->len;
 868}
 869
 870static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
 871					  struct xfrm_state *x, u32 seq)
 872{
 873	struct xfrm_dump_info info;
 874	struct sk_buff *skb;
 
 875
 876	skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
 877	if (!skb)
 878		return ERR_PTR(-ENOMEM);
 879
 880	info.in_skb = in_skb;
 881	info.out_skb = skb;
 882	info.nlmsg_seq = seq;
 883	info.nlmsg_flags = 0;
 884
 885	if (dump_one_state(x, 0, &info)) {
 
 886		kfree_skb(skb);
 887		return NULL;
 888	}
 889
 890	return skb;
 891}
 892
 893static inline size_t xfrm_spdinfo_msgsize(void)
 894{
 895	return NLMSG_ALIGN(4)
 896	       + nla_total_size(sizeof(struct xfrmu_spdinfo))
 897	       + nla_total_size(sizeof(struct xfrmu_spdhinfo));
 898}
 899
 900static int build_spdinfo(struct sk_buff *skb, struct net *net,
 901			 u32 pid, u32 seq, u32 flags)
 902{
 903	struct xfrmk_spdinfo si;
 904	struct xfrmu_spdinfo spc;
 905	struct xfrmu_spdhinfo sph;
 906	struct nlmsghdr *nlh;
 
 907	u32 *f;
 908
 909	nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
 910	if (nlh == NULL) /* shouldn't really happen ... */
 911		return -EMSGSIZE;
 912
 913	f = nlmsg_data(nlh);
 914	*f = flags;
 915	xfrm_spd_getinfo(net, &si);
 916	spc.incnt = si.incnt;
 917	spc.outcnt = si.outcnt;
 918	spc.fwdcnt = si.fwdcnt;
 919	spc.inscnt = si.inscnt;
 920	spc.outscnt = si.outscnt;
 921	spc.fwdscnt = si.fwdscnt;
 922	sph.spdhcnt = si.spdhcnt;
 923	sph.spdhmcnt = si.spdhmcnt;
 924
 925	if (nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc) ||
 926	    nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph))
 927		goto nla_put_failure;
 
 
 
 
 928
 929	return nlmsg_end(skb, nlh);
 930
 931nla_put_failure:
 932	nlmsg_cancel(skb, nlh);
 933	return -EMSGSIZE;
 934}
 935
 936static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
 937		struct nlattr **attrs)
 938{
 939	struct net *net = sock_net(skb->sk);
 940	struct sk_buff *r_skb;
 941	u32 *flags = nlmsg_data(nlh);
 942	u32 spid = NETLINK_CB(skb).pid;
 943	u32 seq = nlh->nlmsg_seq;
 944
 945	r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
 946	if (r_skb == NULL)
 947		return -ENOMEM;
 948
 949	if (build_spdinfo(r_skb, net, spid, seq, *flags) < 0)
 950		BUG();
 951
 952	return nlmsg_unicast(net->xfrm.nlsk, r_skb, spid);
 953}
 954
 955static inline size_t xfrm_sadinfo_msgsize(void)
 956{
 957	return NLMSG_ALIGN(4)
 958	       + nla_total_size(sizeof(struct xfrmu_sadhinfo))
 959	       + nla_total_size(4); /* XFRMA_SAD_CNT */
 960}
 961
 962static int build_sadinfo(struct sk_buff *skb, struct net *net,
 963			 u32 pid, u32 seq, u32 flags)
 964{
 965	struct xfrmk_sadinfo si;
 966	struct xfrmu_sadhinfo sh;
 967	struct nlmsghdr *nlh;
 
 968	u32 *f;
 969
 970	nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
 971	if (nlh == NULL) /* shouldn't really happen ... */
 972		return -EMSGSIZE;
 973
 974	f = nlmsg_data(nlh);
 975	*f = flags;
 976	xfrm_sad_getinfo(net, &si);
 977
 978	sh.sadhmcnt = si.sadhmcnt;
 979	sh.sadhcnt = si.sadhcnt;
 980
 981	if (nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt) ||
 982	    nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh))
 983		goto nla_put_failure;
 
 
 
 
 984
 985	return nlmsg_end(skb, nlh);
 986
 987nla_put_failure:
 988	nlmsg_cancel(skb, nlh);
 989	return -EMSGSIZE;
 990}
 991
 992static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
 993		struct nlattr **attrs)
 994{
 995	struct net *net = sock_net(skb->sk);
 996	struct sk_buff *r_skb;
 997	u32 *flags = nlmsg_data(nlh);
 998	u32 spid = NETLINK_CB(skb).pid;
 999	u32 seq = nlh->nlmsg_seq;
1000
1001	r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
1002	if (r_skb == NULL)
1003		return -ENOMEM;
1004
1005	if (build_sadinfo(r_skb, net, spid, seq, *flags) < 0)
1006		BUG();
1007
1008	return nlmsg_unicast(net->xfrm.nlsk, r_skb, spid);
1009}
1010
1011static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1012		struct nlattr **attrs)
1013{
1014	struct net *net = sock_net(skb->sk);
1015	struct xfrm_usersa_id *p = nlmsg_data(nlh);
1016	struct xfrm_state *x;
1017	struct sk_buff *resp_skb;
1018	int err = -ESRCH;
1019
1020	x = xfrm_user_state_lookup(net, p, attrs, &err);
1021	if (x == NULL)
1022		goto out_noput;
1023
1024	resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1025	if (IS_ERR(resp_skb)) {
1026		err = PTR_ERR(resp_skb);
1027	} else {
1028		err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).pid);
1029	}
1030	xfrm_state_put(x);
1031out_noput:
1032	return err;
1033}
1034
1035static int verify_userspi_info(struct xfrm_userspi_info *p)
1036{
1037	switch (p->info.id.proto) {
1038	case IPPROTO_AH:
1039	case IPPROTO_ESP:
1040		break;
1041
1042	case IPPROTO_COMP:
1043		/* IPCOMP spi is 16-bits. */
1044		if (p->max >= 0x10000)
1045			return -EINVAL;
1046		break;
1047
1048	default:
1049		return -EINVAL;
1050	}
1051
1052	if (p->min > p->max)
1053		return -EINVAL;
1054
1055	return 0;
1056}
1057
1058static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
1059		struct nlattr **attrs)
1060{
1061	struct net *net = sock_net(skb->sk);
1062	struct xfrm_state *x;
1063	struct xfrm_userspi_info *p;
1064	struct sk_buff *resp_skb;
1065	xfrm_address_t *daddr;
1066	int family;
1067	int err;
1068	u32 mark;
1069	struct xfrm_mark m;
1070
1071	p = nlmsg_data(nlh);
1072	err = verify_userspi_info(p);
1073	if (err)
1074		goto out_noput;
1075
1076	family = p->info.family;
1077	daddr = &p->info.id.daddr;
1078
1079	x = NULL;
1080
1081	mark = xfrm_mark_get(attrs, &m);
1082	if (p->info.seq) {
1083		x = xfrm_find_acq_byseq(net, mark, p->info.seq);
1084		if (x && xfrm_addr_cmp(&x->id.daddr, daddr, family)) {
1085			xfrm_state_put(x);
1086			x = NULL;
1087		}
1088	}
1089
1090	if (!x)
1091		x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1092				  p->info.id.proto, daddr,
1093				  &p->info.saddr, 1,
1094				  family);
1095	err = -ENOENT;
1096	if (x == NULL)
1097		goto out_noput;
1098
1099	err = xfrm_alloc_spi(x, p->min, p->max);
1100	if (err)
1101		goto out;
1102
1103	resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1104	if (IS_ERR(resp_skb)) {
1105		err = PTR_ERR(resp_skb);
1106		goto out;
1107	}
1108
1109	err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).pid);
1110
1111out:
1112	xfrm_state_put(x);
1113out_noput:
1114	return err;
1115}
1116
1117static int verify_policy_dir(u8 dir)
1118{
1119	switch (dir) {
1120	case XFRM_POLICY_IN:
1121	case XFRM_POLICY_OUT:
1122	case XFRM_POLICY_FWD:
1123		break;
1124
1125	default:
1126		return -EINVAL;
1127	}
1128
1129	return 0;
1130}
1131
1132static int verify_policy_type(u8 type)
1133{
1134	switch (type) {
1135	case XFRM_POLICY_TYPE_MAIN:
1136#ifdef CONFIG_XFRM_SUB_POLICY
1137	case XFRM_POLICY_TYPE_SUB:
1138#endif
1139		break;
1140
1141	default:
1142		return -EINVAL;
1143	}
1144
1145	return 0;
1146}
1147
1148static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
1149{
 
 
1150	switch (p->share) {
1151	case XFRM_SHARE_ANY:
1152	case XFRM_SHARE_SESSION:
1153	case XFRM_SHARE_USER:
1154	case XFRM_SHARE_UNIQUE:
1155		break;
1156
1157	default:
1158		return -EINVAL;
1159	}
1160
1161	switch (p->action) {
1162	case XFRM_POLICY_ALLOW:
1163	case XFRM_POLICY_BLOCK:
1164		break;
1165
1166	default:
1167		return -EINVAL;
1168	}
1169
1170	switch (p->sel.family) {
1171	case AF_INET:
1172		break;
1173
1174	case AF_INET6:
1175#if IS_ENABLED(CONFIG_IPV6)
1176		break;
1177#else
1178		return  -EAFNOSUPPORT;
1179#endif
1180
1181	default:
1182		return -EINVAL;
1183	}
1184
1185	return verify_policy_dir(p->dir);
 
 
 
 
 
 
1186}
1187
1188static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
1189{
1190	struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1191	struct xfrm_user_sec_ctx *uctx;
1192
1193	if (!rt)
1194		return 0;
1195
1196	uctx = nla_data(rt);
1197	return security_xfrm_policy_alloc(&pol->security, uctx);
1198}
1199
1200static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1201			   int nr)
1202{
1203	int i;
1204
1205	xp->xfrm_nr = nr;
1206	for (i = 0; i < nr; i++, ut++) {
1207		struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1208
1209		memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1210		memcpy(&t->saddr, &ut->saddr,
1211		       sizeof(xfrm_address_t));
1212		t->reqid = ut->reqid;
1213		t->mode = ut->mode;
1214		t->share = ut->share;
1215		t->optional = ut->optional;
1216		t->aalgos = ut->aalgos;
1217		t->ealgos = ut->ealgos;
1218		t->calgos = ut->calgos;
1219		/* If all masks are ~0, then we allow all algorithms. */
1220		t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
1221		t->encap_family = ut->family;
1222	}
1223}
1224
1225static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
1226{
1227	int i;
1228
1229	if (nr > XFRM_MAX_DEPTH)
1230		return -EINVAL;
1231
1232	for (i = 0; i < nr; i++) {
1233		/* We never validated the ut->family value, so many
1234		 * applications simply leave it at zero.  The check was
1235		 * never made and ut->family was ignored because all
1236		 * templates could be assumed to have the same family as
1237		 * the policy itself.  Now that we will have ipv4-in-ipv6
1238		 * and ipv6-in-ipv4 tunnels, this is no longer true.
1239		 */
1240		if (!ut[i].family)
1241			ut[i].family = family;
1242
1243		switch (ut[i].family) {
1244		case AF_INET:
1245			break;
1246#if IS_ENABLED(CONFIG_IPV6)
1247		case AF_INET6:
1248			break;
1249#endif
1250		default:
1251			return -EINVAL;
1252		}
1253	}
1254
1255	return 0;
1256}
1257
1258static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1259{
1260	struct nlattr *rt = attrs[XFRMA_TMPL];
1261
1262	if (!rt) {
1263		pol->xfrm_nr = 0;
1264	} else {
1265		struct xfrm_user_tmpl *utmpl = nla_data(rt);
1266		int nr = nla_len(rt) / sizeof(*utmpl);
1267		int err;
1268
1269		err = validate_tmpl(nr, utmpl, pol->family);
1270		if (err)
1271			return err;
1272
1273		copy_templates(pol, utmpl, nr);
1274	}
1275	return 0;
1276}
1277
1278static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
1279{
1280	struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
1281	struct xfrm_userpolicy_type *upt;
1282	u8 type = XFRM_POLICY_TYPE_MAIN;
1283	int err;
1284
1285	if (rt) {
1286		upt = nla_data(rt);
1287		type = upt->type;
1288	}
1289
1290	err = verify_policy_type(type);
1291	if (err)
1292		return err;
1293
1294	*tp = type;
1295	return 0;
1296}
1297
1298static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1299{
1300	xp->priority = p->priority;
1301	xp->index = p->index;
1302	memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1303	memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1304	xp->action = p->action;
1305	xp->flags = p->flags;
1306	xp->family = p->sel.family;
1307	/* XXX xp->share = p->share; */
1308}
1309
1310static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1311{
 
1312	memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1313	memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1314	memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1315	p->priority = xp->priority;
1316	p->index = xp->index;
1317	p->sel.family = xp->family;
1318	p->dir = dir;
1319	p->action = xp->action;
1320	p->flags = xp->flags;
1321	p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1322}
1323
1324static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1325{
1326	struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
1327	int err;
1328
1329	if (!xp) {
1330		*errp = -ENOMEM;
1331		return NULL;
1332	}
1333
1334	copy_from_user_policy(xp, p);
1335
1336	err = copy_from_user_policy_type(&xp->type, attrs);
1337	if (err)
1338		goto error;
1339
1340	if (!(err = copy_from_user_tmpl(xp, attrs)))
1341		err = copy_from_user_sec_ctx(xp, attrs);
1342	if (err)
1343		goto error;
1344
1345	xfrm_mark_get(attrs, &xp->mark);
1346
1347	return xp;
1348 error:
1349	*errp = err;
1350	xp->walk.dead = 1;
1351	xfrm_policy_destroy(xp);
1352	return NULL;
1353}
1354
1355static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1356		struct nlattr **attrs)
1357{
1358	struct net *net = sock_net(skb->sk);
1359	struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1360	struct xfrm_policy *xp;
1361	struct km_event c;
1362	int err;
1363	int excl;
1364	uid_t loginuid = audit_get_loginuid(current);
1365	u32 sessionid = audit_get_sessionid(current);
1366	u32 sid;
1367
1368	err = verify_newpolicy_info(p);
1369	if (err)
1370		return err;
1371	err = verify_sec_ctx_len(attrs);
1372	if (err)
1373		return err;
1374
1375	xp = xfrm_policy_construct(net, p, attrs, &err);
1376	if (!xp)
1377		return err;
1378
1379	/* shouldn't excl be based on nlh flags??
1380	 * Aha! this is anti-netlink really i.e  more pfkey derived
1381	 * in netlink excl is a flag and you wouldnt need
1382	 * a type XFRM_MSG_UPDPOLICY - JHS */
1383	excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1384	err = xfrm_policy_insert(p->dir, xp, excl);
1385	security_task_getsecid(current, &sid);
1386	xfrm_audit_policy_add(xp, err ? 0 : 1, loginuid, sessionid, sid);
1387
1388	if (err) {
1389		security_xfrm_policy_free(xp->security);
1390		kfree(xp);
1391		return err;
1392	}
1393
1394	c.event = nlh->nlmsg_type;
1395	c.seq = nlh->nlmsg_seq;
1396	c.pid = nlh->nlmsg_pid;
1397	km_policy_notify(xp, p->dir, &c);
1398
1399	xfrm_pol_put(xp);
1400
1401	return 0;
1402}
1403
1404static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1405{
1406	struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1407	int i;
1408
1409	if (xp->xfrm_nr == 0)
1410		return 0;
1411
1412	for (i = 0; i < xp->xfrm_nr; i++) {
1413		struct xfrm_user_tmpl *up = &vec[i];
1414		struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1415
 
1416		memcpy(&up->id, &kp->id, sizeof(up->id));
1417		up->family = kp->encap_family;
1418		memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1419		up->reqid = kp->reqid;
1420		up->mode = kp->mode;
1421		up->share = kp->share;
1422		up->optional = kp->optional;
1423		up->aalgos = kp->aalgos;
1424		up->ealgos = kp->ealgos;
1425		up->calgos = kp->calgos;
1426	}
1427
1428	return nla_put(skb, XFRMA_TMPL,
1429		       sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
1430}
1431
1432static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1433{
1434	if (x->security) {
1435		return copy_sec_ctx(x->security, skb);
1436	}
1437	return 0;
1438}
1439
1440static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1441{
1442	if (xp->security) {
1443		return copy_sec_ctx(xp->security, skb);
1444	}
1445	return 0;
1446}
1447static inline size_t userpolicy_type_attrsize(void)
1448{
1449#ifdef CONFIG_XFRM_SUB_POLICY
1450	return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1451#else
1452	return 0;
1453#endif
1454}
1455
1456#ifdef CONFIG_XFRM_SUB_POLICY
1457static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1458{
1459	struct xfrm_userpolicy_type upt = {
1460		.type = type,
1461	};
1462
1463	return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1464}
1465
1466#else
1467static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1468{
1469	return 0;
1470}
1471#endif
1472
1473static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1474{
1475	struct xfrm_dump_info *sp = ptr;
1476	struct xfrm_userpolicy_info *p;
1477	struct sk_buff *in_skb = sp->in_skb;
1478	struct sk_buff *skb = sp->out_skb;
1479	struct nlmsghdr *nlh;
 
1480
1481	nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq,
1482			XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1483	if (nlh == NULL)
1484		return -EMSGSIZE;
1485
1486	p = nlmsg_data(nlh);
1487	copy_to_user_policy(xp, p, dir);
1488	if (copy_to_user_tmpl(xp, skb) < 0)
1489		goto nlmsg_failure;
1490	if (copy_to_user_sec_ctx(xp, skb))
1491		goto nlmsg_failure;
1492	if (copy_to_user_policy_type(xp->type, skb) < 0)
1493		goto nlmsg_failure;
1494	if (xfrm_mark_put(skb, &xp->mark))
1495		goto nla_put_failure;
1496
 
 
1497	nlmsg_end(skb, nlh);
1498	return 0;
1499
1500nla_put_failure:
1501nlmsg_failure:
1502	nlmsg_cancel(skb, nlh);
1503	return -EMSGSIZE;
1504}
1505
1506static int xfrm_dump_policy_done(struct netlink_callback *cb)
1507{
1508	struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
 
1509
1510	xfrm_policy_walk_done(walk);
1511	return 0;
1512}
1513
1514static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1515{
1516	struct net *net = sock_net(skb->sk);
1517	struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1518	struct xfrm_dump_info info;
1519
1520	BUILD_BUG_ON(sizeof(struct xfrm_policy_walk) >
1521		     sizeof(cb->args) - sizeof(cb->args[0]));
1522
1523	info.in_skb = cb->skb;
1524	info.out_skb = skb;
1525	info.nlmsg_seq = cb->nlh->nlmsg_seq;
1526	info.nlmsg_flags = NLM_F_MULTI;
1527
1528	if (!cb->args[0]) {
1529		cb->args[0] = 1;
1530		xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1531	}
1532
1533	(void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
1534
1535	return skb->len;
1536}
1537
1538static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1539					  struct xfrm_policy *xp,
1540					  int dir, u32 seq)
1541{
1542	struct xfrm_dump_info info;
1543	struct sk_buff *skb;
 
1544
1545	skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1546	if (!skb)
1547		return ERR_PTR(-ENOMEM);
1548
1549	info.in_skb = in_skb;
1550	info.out_skb = skb;
1551	info.nlmsg_seq = seq;
1552	info.nlmsg_flags = 0;
1553
1554	if (dump_one_policy(xp, dir, 0, &info) < 0) {
 
1555		kfree_skb(skb);
1556		return NULL;
1557	}
1558
1559	return skb;
1560}
1561
1562static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1563		struct nlattr **attrs)
1564{
1565	struct net *net = sock_net(skb->sk);
1566	struct xfrm_policy *xp;
1567	struct xfrm_userpolicy_id *p;
1568	u8 type = XFRM_POLICY_TYPE_MAIN;
1569	int err;
1570	struct km_event c;
1571	int delete;
1572	struct xfrm_mark m;
1573	u32 mark = xfrm_mark_get(attrs, &m);
1574
1575	p = nlmsg_data(nlh);
1576	delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1577
1578	err = copy_from_user_policy_type(&type, attrs);
1579	if (err)
1580		return err;
1581
1582	err = verify_policy_dir(p->dir);
1583	if (err)
1584		return err;
1585
1586	if (p->index)
1587		xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err);
1588	else {
1589		struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1590		struct xfrm_sec_ctx *ctx;
1591
1592		err = verify_sec_ctx_len(attrs);
1593		if (err)
1594			return err;
1595
1596		ctx = NULL;
1597		if (rt) {
1598			struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1599
1600			err = security_xfrm_policy_alloc(&ctx, uctx);
1601			if (err)
1602				return err;
1603		}
1604		xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel,
1605					   ctx, delete, &err);
1606		security_xfrm_policy_free(ctx);
1607	}
1608	if (xp == NULL)
1609		return -ENOENT;
1610
1611	if (!delete) {
1612		struct sk_buff *resp_skb;
1613
1614		resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1615		if (IS_ERR(resp_skb)) {
1616			err = PTR_ERR(resp_skb);
1617		} else {
1618			err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
1619					    NETLINK_CB(skb).pid);
1620		}
1621	} else {
1622		uid_t loginuid = audit_get_loginuid(current);
1623		u32 sessionid = audit_get_sessionid(current);
1624		u32 sid;
1625
1626		security_task_getsecid(current, &sid);
1627		xfrm_audit_policy_delete(xp, err ? 0 : 1, loginuid, sessionid,
1628					 sid);
1629
1630		if (err != 0)
1631			goto out;
1632
1633		c.data.byid = p->index;
1634		c.event = nlh->nlmsg_type;
1635		c.seq = nlh->nlmsg_seq;
1636		c.pid = nlh->nlmsg_pid;
1637		km_policy_notify(xp, p->dir, &c);
1638	}
1639
1640out:
1641	xfrm_pol_put(xp);
 
 
1642	return err;
1643}
1644
1645static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1646		struct nlattr **attrs)
1647{
1648	struct net *net = sock_net(skb->sk);
1649	struct km_event c;
1650	struct xfrm_usersa_flush *p = nlmsg_data(nlh);
1651	struct xfrm_audit audit_info;
1652	int err;
1653
1654	audit_info.loginuid = audit_get_loginuid(current);
1655	audit_info.sessionid = audit_get_sessionid(current);
1656	security_task_getsecid(current, &audit_info.secid);
1657	err = xfrm_state_flush(net, p->proto, &audit_info);
1658	if (err) {
1659		if (err == -ESRCH) /* empty table */
1660			return 0;
1661		return err;
1662	}
1663	c.data.proto = p->proto;
1664	c.event = nlh->nlmsg_type;
1665	c.seq = nlh->nlmsg_seq;
1666	c.pid = nlh->nlmsg_pid;
1667	c.net = net;
1668	km_state_notify(NULL, &c);
1669
1670	return 0;
1671}
1672
1673static inline size_t xfrm_aevent_msgsize(struct xfrm_state *x)
1674{
1675	size_t replay_size = x->replay_esn ?
1676			      xfrm_replay_state_esn_len(x->replay_esn) :
1677			      sizeof(struct xfrm_replay_state);
1678
1679	return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
1680	       + nla_total_size(replay_size)
1681	       + nla_total_size(sizeof(struct xfrm_lifetime_cur))
1682	       + nla_total_size(sizeof(struct xfrm_mark))
1683	       + nla_total_size(4) /* XFRM_AE_RTHR */
1684	       + nla_total_size(4); /* XFRM_AE_ETHR */
1685}
1686
1687static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
1688{
1689	struct xfrm_aevent_id *id;
1690	struct nlmsghdr *nlh;
 
1691
1692	nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
1693	if (nlh == NULL)
1694		return -EMSGSIZE;
1695
1696	id = nlmsg_data(nlh);
1697	memcpy(&id->sa_id.daddr, &x->id.daddr,sizeof(x->id.daddr));
1698	id->sa_id.spi = x->id.spi;
1699	id->sa_id.family = x->props.family;
1700	id->sa_id.proto = x->id.proto;
1701	memcpy(&id->saddr, &x->props.saddr,sizeof(x->props.saddr));
1702	id->reqid = x->props.reqid;
1703	id->flags = c->data.aevent;
1704
1705	if (x->replay_esn) {
1706		if (nla_put(skb, XFRMA_REPLAY_ESN_VAL,
1707			    xfrm_replay_state_esn_len(x->replay_esn),
1708			    x->replay_esn))
1709			goto nla_put_failure;
1710	} else {
1711		if (nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
1712			    &x->replay))
1713			goto nla_put_failure;
1714	}
1715	if (nla_put(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft))
1716		goto nla_put_failure;
1717
1718	if ((id->flags & XFRM_AE_RTHR) &&
1719	    nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff))
1720		goto nla_put_failure;
1721
1722	if ((id->flags & XFRM_AE_ETHR) &&
1723	    nla_put_u32(skb, XFRMA_ETIMER_THRESH,
1724			x->replay_maxage * 10 / HZ))
1725		goto nla_put_failure;
1726
1727	if (xfrm_mark_put(skb, &x->mark))
1728		goto nla_put_failure;
 
 
 
 
 
 
 
 
 
 
 
 
1729
1730	return nlmsg_end(skb, nlh);
1731
1732nla_put_failure:
1733	nlmsg_cancel(skb, nlh);
1734	return -EMSGSIZE;
1735}
1736
1737static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1738		struct nlattr **attrs)
1739{
1740	struct net *net = sock_net(skb->sk);
1741	struct xfrm_state *x;
1742	struct sk_buff *r_skb;
1743	int err;
1744	struct km_event c;
1745	u32 mark;
1746	struct xfrm_mark m;
1747	struct xfrm_aevent_id *p = nlmsg_data(nlh);
1748	struct xfrm_usersa_id *id = &p->sa_id;
1749
1750	mark = xfrm_mark_get(attrs, &m);
1751
1752	x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
1753	if (x == NULL)
1754		return -ESRCH;
1755
1756	r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
1757	if (r_skb == NULL) {
1758		xfrm_state_put(x);
1759		return -ENOMEM;
1760	}
1761
1762	/*
1763	 * XXX: is this lock really needed - none of the other
1764	 * gets lock (the concern is things getting updated
1765	 * while we are still reading) - jhs
1766	*/
1767	spin_lock_bh(&x->lock);
1768	c.data.aevent = p->flags;
1769	c.seq = nlh->nlmsg_seq;
1770	c.pid = nlh->nlmsg_pid;
1771
1772	if (build_aevent(r_skb, x, &c) < 0)
1773		BUG();
1774	err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).pid);
1775	spin_unlock_bh(&x->lock);
1776	xfrm_state_put(x);
1777	return err;
1778}
1779
1780static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1781		struct nlattr **attrs)
1782{
1783	struct net *net = sock_net(skb->sk);
1784	struct xfrm_state *x;
1785	struct km_event c;
1786	int err = - EINVAL;
1787	u32 mark = 0;
1788	struct xfrm_mark m;
1789	struct xfrm_aevent_id *p = nlmsg_data(nlh);
1790	struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
1791	struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
1792	struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
1793
1794	if (!lt && !rp && !re)
1795		return err;
1796
1797	/* pedantic mode - thou shalt sayeth replaceth */
1798	if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
1799		return err;
1800
1801	mark = xfrm_mark_get(attrs, &m);
1802
1803	x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
1804	if (x == NULL)
1805		return -ESRCH;
1806
1807	if (x->km.state != XFRM_STATE_VALID)
1808		goto out;
1809
1810	err = xfrm_replay_verify_len(x->replay_esn, rp);
1811	if (err)
1812		goto out;
1813
1814	spin_lock_bh(&x->lock);
1815	xfrm_update_ae_params(x, attrs);
1816	spin_unlock_bh(&x->lock);
1817
1818	c.event = nlh->nlmsg_type;
1819	c.seq = nlh->nlmsg_seq;
1820	c.pid = nlh->nlmsg_pid;
1821	c.data.aevent = XFRM_AE_CU;
1822	km_state_notify(x, &c);
1823	err = 0;
1824out:
1825	xfrm_state_put(x);
1826	return err;
1827}
1828
1829static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1830		struct nlattr **attrs)
1831{
1832	struct net *net = sock_net(skb->sk);
1833	struct km_event c;
1834	u8 type = XFRM_POLICY_TYPE_MAIN;
1835	int err;
1836	struct xfrm_audit audit_info;
1837
1838	err = copy_from_user_policy_type(&type, attrs);
1839	if (err)
1840		return err;
1841
1842	audit_info.loginuid = audit_get_loginuid(current);
1843	audit_info.sessionid = audit_get_sessionid(current);
1844	security_task_getsecid(current, &audit_info.secid);
1845	err = xfrm_policy_flush(net, type, &audit_info);
1846	if (err) {
1847		if (err == -ESRCH) /* empty table */
1848			return 0;
1849		return err;
1850	}
1851
1852	c.data.type = type;
1853	c.event = nlh->nlmsg_type;
1854	c.seq = nlh->nlmsg_seq;
1855	c.pid = nlh->nlmsg_pid;
1856	c.net = net;
1857	km_policy_notify(NULL, 0, &c);
1858	return 0;
1859}
1860
1861static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1862		struct nlattr **attrs)
1863{
1864	struct net *net = sock_net(skb->sk);
1865	struct xfrm_policy *xp;
1866	struct xfrm_user_polexpire *up = nlmsg_data(nlh);
1867	struct xfrm_userpolicy_info *p = &up->pol;
1868	u8 type = XFRM_POLICY_TYPE_MAIN;
1869	int err = -ENOENT;
1870	struct xfrm_mark m;
1871	u32 mark = xfrm_mark_get(attrs, &m);
1872
1873	err = copy_from_user_policy_type(&type, attrs);
1874	if (err)
1875		return err;
1876
1877	err = verify_policy_dir(p->dir);
1878	if (err)
1879		return err;
1880
1881	if (p->index)
1882		xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err);
1883	else {
1884		struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1885		struct xfrm_sec_ctx *ctx;
1886
1887		err = verify_sec_ctx_len(attrs);
1888		if (err)
1889			return err;
1890
1891		ctx = NULL;
1892		if (rt) {
1893			struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1894
1895			err = security_xfrm_policy_alloc(&ctx, uctx);
1896			if (err)
1897				return err;
1898		}
1899		xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir,
1900					   &p->sel, ctx, 0, &err);
1901		security_xfrm_policy_free(ctx);
1902	}
1903	if (xp == NULL)
1904		return -ENOENT;
1905
1906	if (unlikely(xp->walk.dead))
1907		goto out;
1908
1909	err = 0;
1910	if (up->hard) {
1911		uid_t loginuid = audit_get_loginuid(current);
1912		u32 sessionid = audit_get_sessionid(current);
1913		u32 sid;
1914
1915		security_task_getsecid(current, &sid);
1916		xfrm_policy_delete(xp, p->dir);
1917		xfrm_audit_policy_delete(xp, 1, loginuid, sessionid, sid);
1918
1919	} else {
1920		// reset the timers here?
1921		WARN(1, "Dont know what to do with soft policy expire\n");
1922	}
1923	km_policy_expired(xp, p->dir, up->hard, current->pid);
1924
1925out:
1926	xfrm_pol_put(xp);
1927	return err;
1928}
1929
1930static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1931		struct nlattr **attrs)
1932{
1933	struct net *net = sock_net(skb->sk);
1934	struct xfrm_state *x;
1935	int err;
1936	struct xfrm_user_expire *ue = nlmsg_data(nlh);
1937	struct xfrm_usersa_info *p = &ue->state;
1938	struct xfrm_mark m;
1939	u32 mark = xfrm_mark_get(attrs, &m);
1940
1941	x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
1942
1943	err = -ENOENT;
1944	if (x == NULL)
1945		return err;
1946
1947	spin_lock_bh(&x->lock);
1948	err = -EINVAL;
1949	if (x->km.state != XFRM_STATE_VALID)
1950		goto out;
1951	km_state_expired(x, ue->hard, current->pid);
1952
1953	if (ue->hard) {
1954		uid_t loginuid = audit_get_loginuid(current);
1955		u32 sessionid = audit_get_sessionid(current);
1956		u32 sid;
1957
1958		security_task_getsecid(current, &sid);
1959		__xfrm_state_delete(x);
1960		xfrm_audit_state_delete(x, 1, loginuid, sessionid, sid);
1961	}
1962	err = 0;
1963out:
1964	spin_unlock_bh(&x->lock);
1965	xfrm_state_put(x);
1966	return err;
1967}
1968
1969static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
1970		struct nlattr **attrs)
1971{
1972	struct net *net = sock_net(skb->sk);
1973	struct xfrm_policy *xp;
1974	struct xfrm_user_tmpl *ut;
1975	int i;
1976	struct nlattr *rt = attrs[XFRMA_TMPL];
1977	struct xfrm_mark mark;
1978
1979	struct xfrm_user_acquire *ua = nlmsg_data(nlh);
1980	struct xfrm_state *x = xfrm_state_alloc(net);
1981	int err = -ENOMEM;
1982
1983	if (!x)
1984		goto nomem;
1985
1986	xfrm_mark_get(attrs, &mark);
1987
1988	err = verify_newpolicy_info(&ua->policy);
1989	if (err)
1990		goto bad_policy;
1991
1992	/*   build an XP */
1993	xp = xfrm_policy_construct(net, &ua->policy, attrs, &err);
1994	if (!xp)
1995		goto free_state;
1996
1997	memcpy(&x->id, &ua->id, sizeof(ua->id));
1998	memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
1999	memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
2000	xp->mark.m = x->mark.m = mark.m;
2001	xp->mark.v = x->mark.v = mark.v;
2002	ut = nla_data(rt);
2003	/* extract the templates and for each call km_key */
2004	for (i = 0; i < xp->xfrm_nr; i++, ut++) {
2005		struct xfrm_tmpl *t = &xp->xfrm_vec[i];
2006		memcpy(&x->id, &t->id, sizeof(x->id));
2007		x->props.mode = t->mode;
2008		x->props.reqid = t->reqid;
2009		x->props.family = ut->family;
2010		t->aalgos = ua->aalgos;
2011		t->ealgos = ua->ealgos;
2012		t->calgos = ua->calgos;
2013		err = km_query(x, t, xp);
2014
2015	}
2016
2017	kfree(x);
2018	kfree(xp);
2019
2020	return 0;
2021
2022bad_policy:
2023	WARN(1, "BAD policy passed\n");
2024free_state:
2025	kfree(x);
2026nomem:
2027	return err;
2028}
2029
2030#ifdef CONFIG_XFRM_MIGRATE
2031static int copy_from_user_migrate(struct xfrm_migrate *ma,
2032				  struct xfrm_kmaddress *k,
2033				  struct nlattr **attrs, int *num)
2034{
2035	struct nlattr *rt = attrs[XFRMA_MIGRATE];
2036	struct xfrm_user_migrate *um;
2037	int i, num_migrate;
2038
2039	if (k != NULL) {
2040		struct xfrm_user_kmaddress *uk;
2041
2042		uk = nla_data(attrs[XFRMA_KMADDRESS]);
2043		memcpy(&k->local, &uk->local, sizeof(k->local));
2044		memcpy(&k->remote, &uk->remote, sizeof(k->remote));
2045		k->family = uk->family;
2046		k->reserved = uk->reserved;
2047	}
2048
2049	um = nla_data(rt);
2050	num_migrate = nla_len(rt) / sizeof(*um);
2051
2052	if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
2053		return -EINVAL;
2054
2055	for (i = 0; i < num_migrate; i++, um++, ma++) {
2056		memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
2057		memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
2058		memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
2059		memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
2060
2061		ma->proto = um->proto;
2062		ma->mode = um->mode;
2063		ma->reqid = um->reqid;
2064
2065		ma->old_family = um->old_family;
2066		ma->new_family = um->new_family;
2067	}
2068
2069	*num = i;
2070	return 0;
2071}
2072
2073static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2074			   struct nlattr **attrs)
2075{
2076	struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
2077	struct xfrm_migrate m[XFRM_MAX_DEPTH];
2078	struct xfrm_kmaddress km, *kmp;
2079	u8 type;
2080	int err;
2081	int n = 0;
 
2082
2083	if (attrs[XFRMA_MIGRATE] == NULL)
2084		return -EINVAL;
2085
2086	kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
2087
2088	err = copy_from_user_policy_type(&type, attrs);
2089	if (err)
2090		return err;
2091
2092	err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
2093	if (err)
2094		return err;
2095
2096	if (!n)
2097		return 0;
2098
2099	xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp);
2100
2101	return 0;
2102}
2103#else
2104static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2105			   struct nlattr **attrs)
2106{
2107	return -ENOPROTOOPT;
2108}
2109#endif
2110
2111#ifdef CONFIG_XFRM_MIGRATE
2112static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
2113{
2114	struct xfrm_user_migrate um;
2115
2116	memset(&um, 0, sizeof(um));
2117	um.proto = m->proto;
2118	um.mode = m->mode;
2119	um.reqid = m->reqid;
2120	um.old_family = m->old_family;
2121	memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
2122	memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
2123	um.new_family = m->new_family;
2124	memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
2125	memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
2126
2127	return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
2128}
2129
2130static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
2131{
2132	struct xfrm_user_kmaddress uk;
2133
2134	memset(&uk, 0, sizeof(uk));
2135	uk.family = k->family;
2136	uk.reserved = k->reserved;
2137	memcpy(&uk.local, &k->local, sizeof(uk.local));
2138	memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
2139
2140	return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
2141}
2142
2143static inline size_t xfrm_migrate_msgsize(int num_migrate, int with_kma)
2144{
2145	return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
2146	      + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
2147	      + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
2148	      + userpolicy_type_attrsize();
2149}
2150
2151static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
2152			 int num_migrate, const struct xfrm_kmaddress *k,
2153			 const struct xfrm_selector *sel, u8 dir, u8 type)
2154{
2155	const struct xfrm_migrate *mp;
2156	struct xfrm_userpolicy_id *pol_id;
2157	struct nlmsghdr *nlh;
2158	int i;
2159
2160	nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
2161	if (nlh == NULL)
2162		return -EMSGSIZE;
2163
2164	pol_id = nlmsg_data(nlh);
2165	/* copy data from selector, dir, and type to the pol_id */
2166	memset(pol_id, 0, sizeof(*pol_id));
2167	memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
2168	pol_id->dir = dir;
2169
2170	if (k != NULL && (copy_to_user_kmaddress(k, skb) < 0))
2171			goto nlmsg_failure;
2172
2173	if (copy_to_user_policy_type(type, skb) < 0)
2174		goto nlmsg_failure;
2175
 
 
2176	for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
2177		if (copy_to_user_migrate(mp, skb) < 0)
2178			goto nlmsg_failure;
 
2179	}
2180
2181	return nlmsg_end(skb, nlh);
2182nlmsg_failure:
 
2183	nlmsg_cancel(skb, nlh);
2184	return -EMSGSIZE;
2185}
2186
2187static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2188			     const struct xfrm_migrate *m, int num_migrate,
2189			     const struct xfrm_kmaddress *k)
2190{
2191	struct net *net = &init_net;
2192	struct sk_buff *skb;
2193
2194	skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k), GFP_ATOMIC);
2195	if (skb == NULL)
2196		return -ENOMEM;
2197
2198	/* build migrate */
2199	if (build_migrate(skb, m, num_migrate, k, sel, dir, type) < 0)
2200		BUG();
2201
2202	return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MIGRATE, GFP_ATOMIC);
2203}
2204#else
2205static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2206			     const struct xfrm_migrate *m, int num_migrate,
2207			     const struct xfrm_kmaddress *k)
2208{
2209	return -ENOPROTOOPT;
2210}
2211#endif
2212
2213#define XMSGSIZE(type) sizeof(struct type)
2214
2215static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
2216	[XFRM_MSG_NEWSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2217	[XFRM_MSG_DELSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2218	[XFRM_MSG_GETSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2219	[XFRM_MSG_NEWPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2220	[XFRM_MSG_DELPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2221	[XFRM_MSG_GETPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2222	[XFRM_MSG_ALLOCSPI    - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
2223	[XFRM_MSG_ACQUIRE     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
2224	[XFRM_MSG_EXPIRE      - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
2225	[XFRM_MSG_UPDPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2226	[XFRM_MSG_UPDSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2227	[XFRM_MSG_POLEXPIRE   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
2228	[XFRM_MSG_FLUSHSA     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
2229	[XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
2230	[XFRM_MSG_NEWAE       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2231	[XFRM_MSG_GETAE       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2232	[XFRM_MSG_REPORT      - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
2233	[XFRM_MSG_MIGRATE     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2234	[XFRM_MSG_GETSADINFO  - XFRM_MSG_BASE] = sizeof(u32),
2235	[XFRM_MSG_GETSPDINFO  - XFRM_MSG_BASE] = sizeof(u32),
2236};
2237
2238#undef XMSGSIZE
2239
2240static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
2241	[XFRMA_SA]		= { .len = sizeof(struct xfrm_usersa_info)},
2242	[XFRMA_POLICY]		= { .len = sizeof(struct xfrm_userpolicy_info)},
2243	[XFRMA_LASTUSED]	= { .type = NLA_U64},
2244	[XFRMA_ALG_AUTH_TRUNC]	= { .len = sizeof(struct xfrm_algo_auth)},
2245	[XFRMA_ALG_AEAD]	= { .len = sizeof(struct xfrm_algo_aead) },
2246	[XFRMA_ALG_AUTH]	= { .len = sizeof(struct xfrm_algo) },
2247	[XFRMA_ALG_CRYPT]	= { .len = sizeof(struct xfrm_algo) },
2248	[XFRMA_ALG_COMP]	= { .len = sizeof(struct xfrm_algo) },
2249	[XFRMA_ENCAP]		= { .len = sizeof(struct xfrm_encap_tmpl) },
2250	[XFRMA_TMPL]		= { .len = sizeof(struct xfrm_user_tmpl) },
2251	[XFRMA_SEC_CTX]		= { .len = sizeof(struct xfrm_sec_ctx) },
2252	[XFRMA_LTIME_VAL]	= { .len = sizeof(struct xfrm_lifetime_cur) },
2253	[XFRMA_REPLAY_VAL]	= { .len = sizeof(struct xfrm_replay_state) },
2254	[XFRMA_REPLAY_THRESH]	= { .type = NLA_U32 },
2255	[XFRMA_ETIMER_THRESH]	= { .type = NLA_U32 },
2256	[XFRMA_SRCADDR]		= { .len = sizeof(xfrm_address_t) },
2257	[XFRMA_COADDR]		= { .len = sizeof(xfrm_address_t) },
2258	[XFRMA_POLICY_TYPE]	= { .len = sizeof(struct xfrm_userpolicy_type)},
2259	[XFRMA_MIGRATE]		= { .len = sizeof(struct xfrm_user_migrate) },
2260	[XFRMA_KMADDRESS]	= { .len = sizeof(struct xfrm_user_kmaddress) },
2261	[XFRMA_MARK]		= { .len = sizeof(struct xfrm_mark) },
2262	[XFRMA_TFCPAD]		= { .type = NLA_U32 },
2263	[XFRMA_REPLAY_ESN_VAL]	= { .len = sizeof(struct xfrm_replay_state_esn) },
 
 
 
2264};
2265
2266static struct xfrm_link {
2267	int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
2268	int (*dump)(struct sk_buff *, struct netlink_callback *);
2269	int (*done)(struct netlink_callback *);
2270} xfrm_dispatch[XFRM_NR_MSGTYPES] = {
2271	[XFRM_MSG_NEWSA       - XFRM_MSG_BASE] = { .doit = xfrm_add_sa        },
2272	[XFRM_MSG_DELSA       - XFRM_MSG_BASE] = { .doit = xfrm_del_sa        },
2273	[XFRM_MSG_GETSA       - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
2274						   .dump = xfrm_dump_sa,
2275						   .done = xfrm_dump_sa_done  },
2276	[XFRM_MSG_NEWPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_add_policy    },
2277	[XFRM_MSG_DELPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_get_policy    },
2278	[XFRM_MSG_GETPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
2279						   .dump = xfrm_dump_policy,
2280						   .done = xfrm_dump_policy_done },
2281	[XFRM_MSG_ALLOCSPI    - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
2282	[XFRM_MSG_ACQUIRE     - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire   },
2283	[XFRM_MSG_EXPIRE      - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
2284	[XFRM_MSG_UPDPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_add_policy    },
2285	[XFRM_MSG_UPDSA       - XFRM_MSG_BASE] = { .doit = xfrm_add_sa        },
2286	[XFRM_MSG_POLEXPIRE   - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
2287	[XFRM_MSG_FLUSHSA     - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa      },
2288	[XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy  },
2289	[XFRM_MSG_NEWAE       - XFRM_MSG_BASE] = { .doit = xfrm_new_ae  },
2290	[XFRM_MSG_GETAE       - XFRM_MSG_BASE] = { .doit = xfrm_get_ae  },
2291	[XFRM_MSG_MIGRATE     - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate    },
2292	[XFRM_MSG_GETSADINFO  - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo   },
2293	[XFRM_MSG_GETSPDINFO  - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo   },
2294};
2295
2296static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
2297{
2298	struct net *net = sock_net(skb->sk);
2299	struct nlattr *attrs[XFRMA_MAX+1];
2300	struct xfrm_link *link;
2301	int type, err;
2302
2303	type = nlh->nlmsg_type;
2304	if (type > XFRM_MSG_MAX)
2305		return -EINVAL;
2306
2307	type -= XFRM_MSG_BASE;
2308	link = &xfrm_dispatch[type];
2309
2310	/* All operations require privileges, even GET */
2311	if (!capable(CAP_NET_ADMIN))
2312		return -EPERM;
2313
2314	if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
2315	     type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
2316	    (nlh->nlmsg_flags & NLM_F_DUMP)) {
2317		if (link->dump == NULL)
2318			return -EINVAL;
2319
2320		{
2321			struct netlink_dump_control c = {
2322				.dump = link->dump,
2323				.done = link->done,
2324			};
2325			return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
2326		}
2327	}
2328
2329	err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs, XFRMA_MAX,
2330			  xfrma_policy);
2331	if (err < 0)
2332		return err;
2333
2334	if (link->doit == NULL)
2335		return -EINVAL;
2336
2337	return link->doit(skb, nlh, attrs);
2338}
2339
2340static void xfrm_netlink_rcv(struct sk_buff *skb)
2341{
2342	mutex_lock(&xfrm_cfg_mutex);
 
 
2343	netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
2344	mutex_unlock(&xfrm_cfg_mutex);
2345}
2346
2347static inline size_t xfrm_expire_msgsize(void)
2348{
2349	return NLMSG_ALIGN(sizeof(struct xfrm_user_expire))
2350	       + nla_total_size(sizeof(struct xfrm_mark));
2351}
2352
2353static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
2354{
2355	struct xfrm_user_expire *ue;
2356	struct nlmsghdr *nlh;
 
2357
2358	nlh = nlmsg_put(skb, c->pid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
2359	if (nlh == NULL)
2360		return -EMSGSIZE;
2361
2362	ue = nlmsg_data(nlh);
2363	copy_to_user_state(x, &ue->state);
2364	ue->hard = (c->data.hard != 0) ? 1 : 0;
2365
2366	if (xfrm_mark_put(skb, &x->mark))
2367		goto nla_put_failure;
 
2368
2369	return nlmsg_end(skb, nlh);
2370
2371nla_put_failure:
2372	return -EMSGSIZE;
2373}
2374
2375static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
2376{
2377	struct net *net = xs_net(x);
2378	struct sk_buff *skb;
2379
2380	skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
2381	if (skb == NULL)
2382		return -ENOMEM;
2383
2384	if (build_expire(skb, x, c) < 0) {
2385		kfree_skb(skb);
2386		return -EMSGSIZE;
2387	}
2388
2389	return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
2390}
2391
2392static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
2393{
2394	struct net *net = xs_net(x);
2395	struct sk_buff *skb;
2396
2397	skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2398	if (skb == NULL)
2399		return -ENOMEM;
2400
2401	if (build_aevent(skb, x, c) < 0)
2402		BUG();
2403
2404	return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_AEVENTS, GFP_ATOMIC);
2405}
2406
2407static int xfrm_notify_sa_flush(const struct km_event *c)
2408{
2409	struct net *net = c->net;
2410	struct xfrm_usersa_flush *p;
2411	struct nlmsghdr *nlh;
2412	struct sk_buff *skb;
2413	int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
2414
2415	skb = nlmsg_new(len, GFP_ATOMIC);
2416	if (skb == NULL)
2417		return -ENOMEM;
2418
2419	nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
2420	if (nlh == NULL) {
2421		kfree_skb(skb);
2422		return -EMSGSIZE;
2423	}
2424
2425	p = nlmsg_data(nlh);
2426	p->proto = c->data.proto;
2427
2428	nlmsg_end(skb, nlh);
2429
2430	return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
2431}
2432
2433static inline size_t xfrm_sa_len(struct xfrm_state *x)
2434{
2435	size_t l = 0;
2436	if (x->aead)
2437		l += nla_total_size(aead_len(x->aead));
2438	if (x->aalg) {
2439		l += nla_total_size(sizeof(struct xfrm_algo) +
2440				    (x->aalg->alg_key_len + 7) / 8);
2441		l += nla_total_size(xfrm_alg_auth_len(x->aalg));
2442	}
2443	if (x->ealg)
2444		l += nla_total_size(xfrm_alg_len(x->ealg));
2445	if (x->calg)
2446		l += nla_total_size(sizeof(*x->calg));
2447	if (x->encap)
2448		l += nla_total_size(sizeof(*x->encap));
2449	if (x->tfcpad)
2450		l += nla_total_size(sizeof(x->tfcpad));
2451	if (x->replay_esn)
2452		l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
2453	if (x->security)
2454		l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2455				    x->security->ctx_len);
2456	if (x->coaddr)
2457		l += nla_total_size(sizeof(*x->coaddr));
 
 
2458
2459	/* Must count x->lastused as it may become non-zero behind our back. */
2460	l += nla_total_size(sizeof(u64));
2461
2462	return l;
2463}
2464
2465static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
2466{
2467	struct net *net = xs_net(x);
2468	struct xfrm_usersa_info *p;
2469	struct xfrm_usersa_id *id;
2470	struct nlmsghdr *nlh;
2471	struct sk_buff *skb;
2472	int len = xfrm_sa_len(x);
2473	int headlen;
2474
2475	headlen = sizeof(*p);
2476	if (c->event == XFRM_MSG_DELSA) {
2477		len += nla_total_size(headlen);
2478		headlen = sizeof(*id);
2479		len += nla_total_size(sizeof(struct xfrm_mark));
2480	}
2481	len += NLMSG_ALIGN(headlen);
2482
2483	skb = nlmsg_new(len, GFP_ATOMIC);
2484	if (skb == NULL)
2485		return -ENOMEM;
2486
2487	nlh = nlmsg_put(skb, c->pid, c->seq, c->event, headlen, 0);
 
2488	if (nlh == NULL)
2489		goto nla_put_failure;
2490
2491	p = nlmsg_data(nlh);
2492	if (c->event == XFRM_MSG_DELSA) {
2493		struct nlattr *attr;
2494
2495		id = nlmsg_data(nlh);
2496		memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2497		id->spi = x->id.spi;
2498		id->family = x->props.family;
2499		id->proto = x->id.proto;
2500
2501		attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
 
2502		if (attr == NULL)
2503			goto nla_put_failure;
2504
2505		p = nla_data(attr);
2506	}
2507
2508	if (copy_to_user_state_extra(x, p, skb))
2509		goto nla_put_failure;
2510
2511	nlmsg_end(skb, nlh);
2512
2513	return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
2514
2515nla_put_failure:
2516	/* Somebody screwed up with xfrm_sa_len! */
2517	WARN_ON(1);
2518	kfree_skb(skb);
2519	return -1;
2520}
2521
2522static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
2523{
2524
2525	switch (c->event) {
2526	case XFRM_MSG_EXPIRE:
2527		return xfrm_exp_state_notify(x, c);
2528	case XFRM_MSG_NEWAE:
2529		return xfrm_aevent_state_notify(x, c);
2530	case XFRM_MSG_DELSA:
2531	case XFRM_MSG_UPDSA:
2532	case XFRM_MSG_NEWSA:
2533		return xfrm_notify_sa(x, c);
2534	case XFRM_MSG_FLUSHSA:
2535		return xfrm_notify_sa_flush(c);
2536	default:
2537		printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
2538		       c->event);
2539		break;
2540	}
2541
2542	return 0;
2543
2544}
2545
2546static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x,
2547					  struct xfrm_policy *xp)
2548{
2549	return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
2550	       + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2551	       + nla_total_size(sizeof(struct xfrm_mark))
2552	       + nla_total_size(xfrm_user_sec_ctx_size(x->security))
2553	       + userpolicy_type_attrsize();
2554}
2555
2556static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
2557			 struct xfrm_tmpl *xt, struct xfrm_policy *xp,
2558			 int dir)
2559{
 
2560	struct xfrm_user_acquire *ua;
2561	struct nlmsghdr *nlh;
2562	__u32 seq = xfrm_get_acqseq();
2563
2564	nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
2565	if (nlh == NULL)
2566		return -EMSGSIZE;
2567
2568	ua = nlmsg_data(nlh);
2569	memcpy(&ua->id, &x->id, sizeof(ua->id));
2570	memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2571	memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
2572	copy_to_user_policy(xp, &ua->policy, dir);
2573	ua->aalgos = xt->aalgos;
2574	ua->ealgos = xt->ealgos;
2575	ua->calgos = xt->calgos;
2576	ua->seq = x->km.seq = seq;
2577
2578	if (copy_to_user_tmpl(xp, skb) < 0)
2579		goto nlmsg_failure;
2580	if (copy_to_user_state_sec_ctx(x, skb))
2581		goto nlmsg_failure;
2582	if (copy_to_user_policy_type(xp->type, skb) < 0)
2583		goto nlmsg_failure;
2584	if (xfrm_mark_put(skb, &xp->mark))
2585		goto nla_put_failure;
 
 
 
2586
2587	return nlmsg_end(skb, nlh);
2588
2589nla_put_failure:
2590nlmsg_failure:
2591	nlmsg_cancel(skb, nlh);
2592	return -EMSGSIZE;
2593}
2594
2595static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
2596			     struct xfrm_policy *xp, int dir)
2597{
2598	struct net *net = xs_net(x);
2599	struct sk_buff *skb;
2600
2601	skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
2602	if (skb == NULL)
2603		return -ENOMEM;
2604
2605	if (build_acquire(skb, x, xt, xp, dir) < 0)
2606		BUG();
2607
2608	return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_ACQUIRE, GFP_ATOMIC);
2609}
2610
2611/* User gives us xfrm_user_policy_info followed by an array of 0
2612 * or more templates.
2613 */
2614static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
2615					       u8 *data, int len, int *dir)
2616{
2617	struct net *net = sock_net(sk);
2618	struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2619	struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2620	struct xfrm_policy *xp;
2621	int nr;
2622
2623	switch (sk->sk_family) {
2624	case AF_INET:
2625		if (opt != IP_XFRM_POLICY) {
2626			*dir = -EOPNOTSUPP;
2627			return NULL;
2628		}
2629		break;
2630#if IS_ENABLED(CONFIG_IPV6)
2631	case AF_INET6:
2632		if (opt != IPV6_XFRM_POLICY) {
2633			*dir = -EOPNOTSUPP;
2634			return NULL;
2635		}
2636		break;
2637#endif
2638	default:
2639		*dir = -EINVAL;
2640		return NULL;
2641	}
2642
2643	*dir = -EINVAL;
2644
2645	if (len < sizeof(*p) ||
2646	    verify_newpolicy_info(p))
2647		return NULL;
2648
2649	nr = ((len - sizeof(*p)) / sizeof(*ut));
2650	if (validate_tmpl(nr, ut, p->sel.family))
2651		return NULL;
2652
2653	if (p->dir > XFRM_POLICY_OUT)
2654		return NULL;
2655
2656	xp = xfrm_policy_alloc(net, GFP_ATOMIC);
2657	if (xp == NULL) {
2658		*dir = -ENOBUFS;
2659		return NULL;
2660	}
2661
2662	copy_from_user_policy(xp, p);
2663	xp->type = XFRM_POLICY_TYPE_MAIN;
2664	copy_templates(xp, ut, nr);
2665
2666	*dir = p->dir;
2667
2668	return xp;
2669}
2670
2671static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp)
2672{
2673	return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
2674	       + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2675	       + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
2676	       + nla_total_size(sizeof(struct xfrm_mark))
2677	       + userpolicy_type_attrsize();
2678}
2679
2680static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
2681			   int dir, const struct km_event *c)
2682{
2683	struct xfrm_user_polexpire *upe;
2684	struct nlmsghdr *nlh;
2685	int hard = c->data.hard;
 
 
2686
2687	nlh = nlmsg_put(skb, c->pid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
2688	if (nlh == NULL)
2689		return -EMSGSIZE;
2690
2691	upe = nlmsg_data(nlh);
2692	copy_to_user_policy(xp, &upe->pol, dir);
2693	if (copy_to_user_tmpl(xp, skb) < 0)
2694		goto nlmsg_failure;
2695	if (copy_to_user_sec_ctx(xp, skb))
2696		goto nlmsg_failure;
2697	if (copy_to_user_policy_type(xp->type, skb) < 0)
2698		goto nlmsg_failure;
2699	if (xfrm_mark_put(skb, &xp->mark))
2700		goto nla_put_failure;
 
 
 
2701	upe->hard = !!hard;
2702
2703	return nlmsg_end(skb, nlh);
2704
2705nla_put_failure:
2706nlmsg_failure:
2707	nlmsg_cancel(skb, nlh);
2708	return -EMSGSIZE;
2709}
2710
2711static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2712{
2713	struct net *net = xp_net(xp);
2714	struct sk_buff *skb;
2715
2716	skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
2717	if (skb == NULL)
2718		return -ENOMEM;
2719
2720	if (build_polexpire(skb, xp, dir, c) < 0)
2721		BUG();
2722
2723	return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
2724}
2725
2726static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2727{
 
2728	struct net *net = xp_net(xp);
2729	struct xfrm_userpolicy_info *p;
2730	struct xfrm_userpolicy_id *id;
2731	struct nlmsghdr *nlh;
2732	struct sk_buff *skb;
2733	int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
2734	int headlen;
2735
2736	headlen = sizeof(*p);
2737	if (c->event == XFRM_MSG_DELPOLICY) {
2738		len += nla_total_size(headlen);
2739		headlen = sizeof(*id);
2740	}
2741	len += userpolicy_type_attrsize();
2742	len += nla_total_size(sizeof(struct xfrm_mark));
2743	len += NLMSG_ALIGN(headlen);
2744
2745	skb = nlmsg_new(len, GFP_ATOMIC);
2746	if (skb == NULL)
2747		return -ENOMEM;
2748
2749	nlh = nlmsg_put(skb, c->pid, c->seq, c->event, headlen, 0);
 
2750	if (nlh == NULL)
2751		goto nlmsg_failure;
2752
2753	p = nlmsg_data(nlh);
2754	if (c->event == XFRM_MSG_DELPOLICY) {
2755		struct nlattr *attr;
2756
2757		id = nlmsg_data(nlh);
2758		memset(id, 0, sizeof(*id));
2759		id->dir = dir;
2760		if (c->data.byid)
2761			id->index = xp->index;
2762		else
2763			memcpy(&id->sel, &xp->selector, sizeof(id->sel));
2764
2765		attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
 
2766		if (attr == NULL)
2767			goto nlmsg_failure;
2768
2769		p = nla_data(attr);
2770	}
2771
2772	copy_to_user_policy(xp, p, dir);
2773	if (copy_to_user_tmpl(xp, skb) < 0)
2774		goto nlmsg_failure;
2775	if (copy_to_user_policy_type(xp->type, skb) < 0)
2776		goto nlmsg_failure;
2777
2778	if (xfrm_mark_put(skb, &xp->mark))
2779		goto nla_put_failure;
2780
2781	nlmsg_end(skb, nlh);
2782
2783	return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
2784
2785nla_put_failure:
2786nlmsg_failure:
2787	kfree_skb(skb);
2788	return -1;
2789}
2790
2791static int xfrm_notify_policy_flush(const struct km_event *c)
2792{
2793	struct net *net = c->net;
2794	struct nlmsghdr *nlh;
2795	struct sk_buff *skb;
 
2796
2797	skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
2798	if (skb == NULL)
2799		return -ENOMEM;
2800
2801	nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
 
2802	if (nlh == NULL)
2803		goto nlmsg_failure;
2804	if (copy_to_user_policy_type(c->data.type, skb) < 0)
2805		goto nlmsg_failure;
 
2806
2807	nlmsg_end(skb, nlh);
2808
2809	return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
2810
2811nlmsg_failure:
2812	kfree_skb(skb);
2813	return -1;
2814}
2815
2816static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2817{
2818
2819	switch (c->event) {
2820	case XFRM_MSG_NEWPOLICY:
2821	case XFRM_MSG_UPDPOLICY:
2822	case XFRM_MSG_DELPOLICY:
2823		return xfrm_notify_policy(xp, dir, c);
2824	case XFRM_MSG_FLUSHPOLICY:
2825		return xfrm_notify_policy_flush(c);
2826	case XFRM_MSG_POLEXPIRE:
2827		return xfrm_exp_policy_notify(xp, dir, c);
2828	default:
2829		printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
2830		       c->event);
2831	}
2832
2833	return 0;
2834
2835}
2836
2837static inline size_t xfrm_report_msgsize(void)
2838{
2839	return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
2840}
2841
2842static int build_report(struct sk_buff *skb, u8 proto,
2843			struct xfrm_selector *sel, xfrm_address_t *addr)
2844{
2845	struct xfrm_user_report *ur;
2846	struct nlmsghdr *nlh;
2847
2848	nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
2849	if (nlh == NULL)
2850		return -EMSGSIZE;
2851
2852	ur = nlmsg_data(nlh);
2853	ur->proto = proto;
2854	memcpy(&ur->sel, sel, sizeof(ur->sel));
2855
2856	if (addr &&
2857	    nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr))
2858		goto nla_put_failure;
2859
 
 
 
2860	return nlmsg_end(skb, nlh);
2861
2862nla_put_failure:
2863	nlmsg_cancel(skb, nlh);
2864	return -EMSGSIZE;
2865}
2866
2867static int xfrm_send_report(struct net *net, u8 proto,
2868			    struct xfrm_selector *sel, xfrm_address_t *addr)
2869{
2870	struct sk_buff *skb;
2871
2872	skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
2873	if (skb == NULL)
2874		return -ENOMEM;
2875
2876	if (build_report(skb, proto, sel, addr) < 0)
2877		BUG();
2878
2879	return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_REPORT, GFP_ATOMIC);
2880}
2881
2882static inline size_t xfrm_mapping_msgsize(void)
2883{
2884	return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
2885}
2886
2887static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
2888			 xfrm_address_t *new_saddr, __be16 new_sport)
2889{
2890	struct xfrm_user_mapping *um;
2891	struct nlmsghdr *nlh;
2892
2893	nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
2894	if (nlh == NULL)
2895		return -EMSGSIZE;
2896
2897	um = nlmsg_data(nlh);
2898
2899	memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
2900	um->id.spi = x->id.spi;
2901	um->id.family = x->props.family;
2902	um->id.proto = x->id.proto;
2903	memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
2904	memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
2905	um->new_sport = new_sport;
2906	um->old_sport = x->encap->encap_sport;
2907	um->reqid = x->props.reqid;
2908
2909	return nlmsg_end(skb, nlh);
2910}
2911
2912static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
2913			     __be16 sport)
2914{
2915	struct net *net = xs_net(x);
2916	struct sk_buff *skb;
2917
2918	if (x->id.proto != IPPROTO_ESP)
2919		return -EINVAL;
2920
2921	if (!x->encap)
2922		return -EINVAL;
2923
2924	skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
2925	if (skb == NULL)
2926		return -ENOMEM;
2927
2928	if (build_mapping(skb, x, ipaddr, sport) < 0)
2929		BUG();
2930
2931	return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MAPPING, GFP_ATOMIC);
2932}
2933
 
 
 
 
 
2934static struct xfrm_mgr netlink_mgr = {
2935	.id		= "netlink",
2936	.notify		= xfrm_send_state_notify,
2937	.acquire	= xfrm_send_acquire,
2938	.compile_policy	= xfrm_compile_policy,
2939	.notify_policy	= xfrm_send_policy_notify,
2940	.report		= xfrm_send_report,
2941	.migrate	= xfrm_send_migrate,
2942	.new_mapping	= xfrm_send_mapping,
 
2943};
2944
2945static int __net_init xfrm_user_net_init(struct net *net)
2946{
2947	struct sock *nlsk;
 
 
 
 
2948
2949	nlsk = netlink_kernel_create(net, NETLINK_XFRM, XFRMNLGRP_MAX,
2950				     xfrm_netlink_rcv, NULL, THIS_MODULE);
2951	if (nlsk == NULL)
2952		return -ENOMEM;
2953	net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
2954	rcu_assign_pointer(net->xfrm.nlsk, nlsk);
2955	return 0;
2956}
2957
2958static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
2959{
2960	struct net *net;
2961	list_for_each_entry(net, net_exit_list, exit_list)
2962		RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
2963	synchronize_net();
2964	list_for_each_entry(net, net_exit_list, exit_list)
2965		netlink_kernel_release(net->xfrm.nlsk_stash);
2966}
2967
2968static struct pernet_operations xfrm_user_net_ops = {
2969	.init	    = xfrm_user_net_init,
2970	.exit_batch = xfrm_user_net_exit,
2971};
2972
2973static int __init xfrm_user_init(void)
2974{
2975	int rv;
2976
2977	printk(KERN_INFO "Initializing XFRM netlink socket\n");
2978
2979	rv = register_pernet_subsys(&xfrm_user_net_ops);
2980	if (rv < 0)
2981		return rv;
2982	rv = xfrm_register_km(&netlink_mgr);
2983	if (rv < 0)
2984		unregister_pernet_subsys(&xfrm_user_net_ops);
2985	return rv;
2986}
2987
2988static void __exit xfrm_user_exit(void)
2989{
2990	xfrm_unregister_km(&netlink_mgr);
2991	unregister_pernet_subsys(&xfrm_user_net_ops);
2992}
2993
2994module_init(xfrm_user_init);
2995module_exit(xfrm_user_exit);
2996MODULE_LICENSE("GPL");
2997MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
2998