1// SPDX-License-Identifier: GPL-2.0-only 2/* xfrm_user.c: User interface to configure xfrm engine. 3 * 4 * Copyright (C) 2002 David S. Miller (davem@redhat.com) 5 * 6 * Changes: 7 * Mitsuru KANDA @USAGI 8 * Kazunori MIYAZAWA @USAGI 9 * Kunihiro Ishiguro <kunihiro@ipinfusion.com> 10 * IPv6 support 11 * 12 */ 13 14#include <linux/compat.h> 15#include <linux/crypto.h> 16#include <linux/module.h> 17#include <linux/kernel.h> 18#include <linux/types.h> 19#include <linux/slab.h> 20#include <linux/socket.h> 21#include <linux/string.h> 22#include <linux/net.h> 23#include <linux/skbuff.h> 24#include <linux/pfkeyv2.h> 25#include <linux/ipsec.h> 26#include <linux/init.h> 27#include <linux/security.h> 28#include <net/sock.h> 29#include <net/xfrm.h> 30#include <net/netlink.h> 31#include <net/ah.h> 32#include <linux/uaccess.h> 33#if IS_ENABLED(CONFIG_IPV6) 34#include <linux/in6.h> 35#endif 36#include <asm/unaligned.h> 37 38static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type, 39 struct netlink_ext_ack *extack) 40{ 41 struct nlattr *rt = attrs[type]; 42 struct xfrm_algo *algp; 43 44 if (!rt) 45 return 0; 46 47 algp = nla_data(rt); 48 if (nla_len(rt) < (int)xfrm_alg_len(algp)) { 49 NL_SET_ERR_MSG(extack, "Invalid AUTH/CRYPT/COMP attribute length"); 50 return -EINVAL; 51 } 52 53 switch (type) { 54 case XFRMA_ALG_AUTH: 55 case XFRMA_ALG_CRYPT: 56 case XFRMA_ALG_COMP: 57 break; 58 59 default: 60 NL_SET_ERR_MSG(extack, "Invalid algorithm attribute type"); 61 return -EINVAL; 62 } 63 64 algp->alg_name[sizeof(algp->alg_name) - 1] = '\0'; 65 return 0; 66} 67 68static int verify_auth_trunc(struct nlattr **attrs, 69 struct netlink_ext_ack *extack) 70{ 71 struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC]; 72 struct xfrm_algo_auth *algp; 73 74 if (!rt) 75 return 0; 76 77 algp = nla_data(rt); 78 if (nla_len(rt) < (int)xfrm_alg_auth_len(algp)) { 79 NL_SET_ERR_MSG(extack, "Invalid AUTH_TRUNC attribute length"); 80 return -EINVAL; 81 } 82 83 algp->alg_name[sizeof(algp->alg_name) - 1] = '\0'; 84 return 0; 85} 86 87static int verify_aead(struct nlattr **attrs, struct netlink_ext_ack *extack) 88{ 89 struct nlattr *rt = attrs[XFRMA_ALG_AEAD]; 90 struct xfrm_algo_aead *algp; 91 92 if (!rt) 93 return 0; 94 95 algp = nla_data(rt); 96 if (nla_len(rt) < (int)aead_len(algp)) { 97 NL_SET_ERR_MSG(extack, "Invalid AEAD attribute length"); 98 return -EINVAL; 99 } 100 101 algp->alg_name[sizeof(algp->alg_name) - 1] = '\0'; 102 return 0; 103} 104 105static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type, 106 xfrm_address_t **addrp) 107{ 108 struct nlattr *rt = attrs[type]; 109 110 if (rt && addrp) 111 *addrp = nla_data(rt); 112} 113 114static inline int verify_sec_ctx_len(struct nlattr **attrs, struct netlink_ext_ack *extack) 115{ 116 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 117 struct xfrm_user_sec_ctx *uctx; 118 119 if (!rt) 120 return 0; 121 122 uctx = nla_data(rt); 123 if (uctx->len > nla_len(rt) || 124 uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len)) { 125 NL_SET_ERR_MSG(extack, "Invalid security context length"); 126 return -EINVAL; 127 } 128 129 return 0; 130} 131 132static inline int verify_replay(struct xfrm_usersa_info *p, 133 struct nlattr **attrs, 134 struct netlink_ext_ack *extack) 135{ 136 struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL]; 137 struct xfrm_replay_state_esn *rs; 138 139 if (!rt) { 140 if (p->flags & XFRM_STATE_ESN) { 141 NL_SET_ERR_MSG(extack, "Missing required attribute for ESN"); 142 return -EINVAL; 143 } 144 return 0; 145 } 146 147 rs = nla_data(rt); 148 149 if (rs->bmp_len > XFRMA_REPLAY_ESN_MAX / sizeof(rs->bmp[0]) / 8) { 150 NL_SET_ERR_MSG(extack, "ESN bitmap length must be <= 128"); 151 return -EINVAL; 152 } 153 154 if (nla_len(rt) < (int)xfrm_replay_state_esn_len(rs) && 155 nla_len(rt) != sizeof(*rs)) { 156 NL_SET_ERR_MSG(extack, "ESN attribute is too short to fit the full bitmap length"); 157 return -EINVAL; 158 } 159 160 /* As only ESP and AH support ESN feature. */ 161 if ((p->id.proto != IPPROTO_ESP) && (p->id.proto != IPPROTO_AH)) { 162 NL_SET_ERR_MSG(extack, "ESN only supported for ESP and AH"); 163 return -EINVAL; 164 } 165 166 if (p->replay_window != 0) { 167 NL_SET_ERR_MSG(extack, "ESN not compatible with legacy replay_window"); 168 return -EINVAL; 169 } 170 171 return 0; 172} 173 174static int verify_newsa_info(struct xfrm_usersa_info *p, 175 struct nlattr **attrs, 176 struct netlink_ext_ack *extack) 177{ 178 int err; 179 180 err = -EINVAL; 181 switch (p->family) { 182 case AF_INET: 183 break; 184 185 case AF_INET6: 186#if IS_ENABLED(CONFIG_IPV6) 187 break; 188#else 189 err = -EAFNOSUPPORT; 190 NL_SET_ERR_MSG(extack, "IPv6 support disabled"); 191 goto out; 192#endif 193 194 default: 195 NL_SET_ERR_MSG(extack, "Invalid address family"); 196 goto out; 197 } 198 199 switch (p->sel.family) { 200 case AF_UNSPEC: 201 break; 202 203 case AF_INET: 204 if (p->sel.prefixlen_d > 32 || p->sel.prefixlen_s > 32) { 205 NL_SET_ERR_MSG(extack, "Invalid prefix length in selector (must be <= 32 for IPv4)"); 206 goto out; 207 } 208 209 break; 210 211 case AF_INET6: 212#if IS_ENABLED(CONFIG_IPV6) 213 if (p->sel.prefixlen_d > 128 || p->sel.prefixlen_s > 128) { 214 NL_SET_ERR_MSG(extack, "Invalid prefix length in selector (must be <= 128 for IPv6)"); 215 goto out; 216 } 217 218 break; 219#else 220 NL_SET_ERR_MSG(extack, "IPv6 support disabled"); 221 err = -EAFNOSUPPORT; 222 goto out; 223#endif 224 225 default: 226 NL_SET_ERR_MSG(extack, "Invalid address family in selector"); 227 goto out; 228 } 229 230 err = -EINVAL; 231 switch (p->id.proto) { 232 case IPPROTO_AH: 233 if (!attrs[XFRMA_ALG_AUTH] && 234 !attrs[XFRMA_ALG_AUTH_TRUNC]) { 235 NL_SET_ERR_MSG(extack, "Missing required attribute for AH: AUTH_TRUNC or AUTH"); 236 goto out; 237 } 238 239 if (attrs[XFRMA_ALG_AEAD] || 240 attrs[XFRMA_ALG_CRYPT] || 241 attrs[XFRMA_ALG_COMP] || 242 attrs[XFRMA_TFCPAD]) { 243 NL_SET_ERR_MSG(extack, "Invalid attributes for AH: AEAD, CRYPT, COMP, TFCPAD"); 244 goto out; 245 } 246 break; 247 248 case IPPROTO_ESP: 249 if (attrs[XFRMA_ALG_COMP]) { 250 NL_SET_ERR_MSG(extack, "Invalid attribute for ESP: COMP"); 251 goto out; 252 } 253 254 if (!attrs[XFRMA_ALG_AUTH] && 255 !attrs[XFRMA_ALG_AUTH_TRUNC] && 256 !attrs[XFRMA_ALG_CRYPT] && 257 !attrs[XFRMA_ALG_AEAD]) { 258 NL_SET_ERR_MSG(extack, "Missing required attribute for ESP: at least one of AUTH, AUTH_TRUNC, CRYPT, AEAD"); 259 goto out; 260 } 261 262 if ((attrs[XFRMA_ALG_AUTH] || 263 attrs[XFRMA_ALG_AUTH_TRUNC] || 264 attrs[XFRMA_ALG_CRYPT]) && 265 attrs[XFRMA_ALG_AEAD]) { 266 NL_SET_ERR_MSG(extack, "Invalid attribute combination for ESP: AEAD can't be used with AUTH, AUTH_TRUNC, CRYPT"); 267 goto out; 268 } 269 270 if (attrs[XFRMA_TFCPAD] && 271 p->mode != XFRM_MODE_TUNNEL) { 272 NL_SET_ERR_MSG(extack, "TFC padding can only be used in tunnel mode"); 273 goto out; 274 } 275 break; 276 277 case IPPROTO_COMP: 278 if (!attrs[XFRMA_ALG_COMP]) { 279 NL_SET_ERR_MSG(extack, "Missing required attribute for COMP: COMP"); 280 goto out; 281 } 282 283 if (attrs[XFRMA_ALG_AEAD] || 284 attrs[XFRMA_ALG_AUTH] || 285 attrs[XFRMA_ALG_AUTH_TRUNC] || 286 attrs[XFRMA_ALG_CRYPT] || 287 attrs[XFRMA_TFCPAD]) { 288 NL_SET_ERR_MSG(extack, "Invalid attributes for COMP: AEAD, AUTH, AUTH_TRUNC, CRYPT, TFCPAD"); 289 goto out; 290 } 291 292 if (ntohl(p->id.spi) >= 0x10000) { 293 NL_SET_ERR_MSG(extack, "SPI is too large for COMP (must be < 0x10000)"); 294 goto out; 295 } 296 break; 297 298#if IS_ENABLED(CONFIG_IPV6) 299 case IPPROTO_DSTOPTS: 300 case IPPROTO_ROUTING: 301 if (attrs[XFRMA_ALG_COMP] || 302 attrs[XFRMA_ALG_AUTH] || 303 attrs[XFRMA_ALG_AUTH_TRUNC] || 304 attrs[XFRMA_ALG_AEAD] || 305 attrs[XFRMA_ALG_CRYPT] || 306 attrs[XFRMA_ENCAP] || 307 attrs[XFRMA_SEC_CTX] || 308 attrs[XFRMA_TFCPAD]) { 309 NL_SET_ERR_MSG(extack, "Invalid attributes for DSTOPTS/ROUTING"); 310 goto out; 311 } 312 313 if (!attrs[XFRMA_COADDR]) { 314 NL_SET_ERR_MSG(extack, "Missing required COADDR attribute for DSTOPTS/ROUTING"); 315 goto out; 316 } 317 break; 318#endif 319 320 default: 321 NL_SET_ERR_MSG(extack, "Unsupported protocol"); 322 goto out; 323 } 324 325 if ((err = verify_aead(attrs, extack))) 326 goto out; 327 if ((err = verify_auth_trunc(attrs, extack))) 328 goto out; 329 if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH, extack))) 330 goto out; 331 if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT, extack))) 332 goto out; 333 if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP, extack))) 334 goto out; 335 if ((err = verify_sec_ctx_len(attrs, extack))) 336 goto out; 337 if ((err = verify_replay(p, attrs, extack))) 338 goto out; 339 340 err = -EINVAL; 341 switch (p->mode) { 342 case XFRM_MODE_TRANSPORT: 343 case XFRM_MODE_TUNNEL: 344 case XFRM_MODE_ROUTEOPTIMIZATION: 345 case XFRM_MODE_BEET: 346 break; 347 348 default: 349 NL_SET_ERR_MSG(extack, "Unsupported mode"); 350 goto out; 351 } 352 353 err = 0; 354 355 if (attrs[XFRMA_MTIMER_THRESH]) { 356 if (!attrs[XFRMA_ENCAP]) { 357 NL_SET_ERR_MSG(extack, "MTIMER_THRESH attribute can only be set on ENCAP states"); 358 err = -EINVAL; 359 goto out; 360 } 361 } 362 363out: 364 return err; 365} 366 367static int attach_one_algo(struct xfrm_algo **algpp, u8 *props, 368 struct xfrm_algo_desc *(*get_byname)(const char *, int), 369 struct nlattr *rta, struct netlink_ext_ack *extack) 370{ 371 struct xfrm_algo *p, *ualg; 372 struct xfrm_algo_desc *algo; 373 374 if (!rta) 375 return 0; 376 377 ualg = nla_data(rta); 378 379 algo = get_byname(ualg->alg_name, 1); 380 if (!algo) { 381 NL_SET_ERR_MSG(extack, "Requested COMP algorithm not found"); 382 return -ENOSYS; 383 } 384 *props = algo->desc.sadb_alg_id; 385 386 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL); 387 if (!p) 388 return -ENOMEM; 389 390 strcpy(p->alg_name, algo->name); 391 *algpp = p; 392 return 0; 393} 394 395static int attach_crypt(struct xfrm_state *x, struct nlattr *rta, 396 struct netlink_ext_ack *extack) 397{ 398 struct xfrm_algo *p, *ualg; 399 struct xfrm_algo_desc *algo; 400 401 if (!rta) 402 return 0; 403 404 ualg = nla_data(rta); 405 406 algo = xfrm_ealg_get_byname(ualg->alg_name, 1); 407 if (!algo) { 408 NL_SET_ERR_MSG(extack, "Requested CRYPT algorithm not found"); 409 return -ENOSYS; 410 } 411 x->props.ealgo = algo->desc.sadb_alg_id; 412 413 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL); 414 if (!p) 415 return -ENOMEM; 416 417 strcpy(p->alg_name, algo->name); 418 x->ealg = p; 419 x->geniv = algo->uinfo.encr.geniv; 420 return 0; 421} 422 423static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props, 424 struct nlattr *rta, struct netlink_ext_ack *extack) 425{ 426 struct xfrm_algo *ualg; 427 struct xfrm_algo_auth *p; 428 struct xfrm_algo_desc *algo; 429 430 if (!rta) 431 return 0; 432 433 ualg = nla_data(rta); 434 435 algo = xfrm_aalg_get_byname(ualg->alg_name, 1); 436 if (!algo) { 437 NL_SET_ERR_MSG(extack, "Requested AUTH algorithm not found"); 438 return -ENOSYS; 439 } 440 *props = algo->desc.sadb_alg_id; 441 442 p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL); 443 if (!p) 444 return -ENOMEM; 445 446 strcpy(p->alg_name, algo->name); 447 p->alg_key_len = ualg->alg_key_len; 448 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits; 449 memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8); 450 451 *algpp = p; 452 return 0; 453} 454 455static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props, 456 struct nlattr *rta, struct netlink_ext_ack *extack) 457{ 458 struct xfrm_algo_auth *p, *ualg; 459 struct xfrm_algo_desc *algo; 460 461 if (!rta) 462 return 0; 463 464 ualg = nla_data(rta); 465 466 algo = xfrm_aalg_get_byname(ualg->alg_name, 1); 467 if (!algo) { 468 NL_SET_ERR_MSG(extack, "Requested AUTH_TRUNC algorithm not found"); 469 return -ENOSYS; 470 } 471 if (ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits) { 472 NL_SET_ERR_MSG(extack, "Invalid length requested for truncated ICV"); 473 return -EINVAL; 474 } 475 *props = algo->desc.sadb_alg_id; 476 477 p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL); 478 if (!p) 479 return -ENOMEM; 480 481 strcpy(p->alg_name, algo->name); 482 if (!p->alg_trunc_len) 483 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits; 484 485 *algpp = p; 486 return 0; 487} 488 489static int attach_aead(struct xfrm_state *x, struct nlattr *rta, 490 struct netlink_ext_ack *extack) 491{ 492 struct xfrm_algo_aead *p, *ualg; 493 struct xfrm_algo_desc *algo; 494 495 if (!rta) 496 return 0; 497 498 ualg = nla_data(rta); 499 500 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1); 501 if (!algo) { 502 NL_SET_ERR_MSG(extack, "Requested AEAD algorithm not found"); 503 return -ENOSYS; 504 } 505 x->props.ealgo = algo->desc.sadb_alg_id; 506 507 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL); 508 if (!p) 509 return -ENOMEM; 510 511 strcpy(p->alg_name, algo->name); 512 x->aead = p; 513 x->geniv = algo->uinfo.aead.geniv; 514 return 0; 515} 516 517static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn, 518 struct nlattr *rp, 519 struct netlink_ext_ack *extack) 520{ 521 struct xfrm_replay_state_esn *up; 522 unsigned int ulen; 523 524 if (!replay_esn || !rp) 525 return 0; 526 527 up = nla_data(rp); 528 ulen = xfrm_replay_state_esn_len(up); 529 530 /* Check the overall length and the internal bitmap length to avoid 531 * potential overflow. */ 532 if (nla_len(rp) < (int)ulen) { 533 NL_SET_ERR_MSG(extack, "ESN attribute is too short"); 534 return -EINVAL; 535 } 536 537 if (xfrm_replay_state_esn_len(replay_esn) != ulen) { 538 NL_SET_ERR_MSG(extack, "New ESN size doesn't match the existing SA's ESN size"); 539 return -EINVAL; 540 } 541 542 if (replay_esn->bmp_len != up->bmp_len) { 543 NL_SET_ERR_MSG(extack, "New ESN bitmap size doesn't match the existing SA's ESN bitmap"); 544 return -EINVAL; 545 } 546 547 if (up->replay_window > up->bmp_len * sizeof(__u32) * 8) { 548 NL_SET_ERR_MSG(extack, "ESN replay window is longer than the bitmap"); 549 return -EINVAL; 550 } 551 552 return 0; 553} 554 555static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn, 556 struct xfrm_replay_state_esn **preplay_esn, 557 struct nlattr *rta) 558{ 559 struct xfrm_replay_state_esn *p, *pp, *up; 560 unsigned int klen, ulen; 561 562 if (!rta) 563 return 0; 564 565 up = nla_data(rta); 566 klen = xfrm_replay_state_esn_len(up); 567 ulen = nla_len(rta) >= (int)klen ? klen : sizeof(*up); 568 569 p = kzalloc(klen, GFP_KERNEL); 570 if (!p) 571 return -ENOMEM; 572 573 pp = kzalloc(klen, GFP_KERNEL); 574 if (!pp) { 575 kfree(p); 576 return -ENOMEM; 577 } 578 579 memcpy(p, up, ulen); 580 memcpy(pp, up, ulen); 581 582 *replay_esn = p; 583 *preplay_esn = pp; 584 585 return 0; 586} 587 588static inline unsigned int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx) 589{ 590 unsigned int len = 0; 591 592 if (xfrm_ctx) { 593 len += sizeof(struct xfrm_user_sec_ctx); 594 len += xfrm_ctx->ctx_len; 595 } 596 return len; 597} 598 599static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p) 600{ 601 memcpy(&x->id, &p->id, sizeof(x->id)); 602 memcpy(&x->sel, &p->sel, sizeof(x->sel)); 603 memcpy(&x->lft, &p->lft, sizeof(x->lft)); 604 x->props.mode = p->mode; 605 x->props.replay_window = min_t(unsigned int, p->replay_window, 606 sizeof(x->replay.bitmap) * 8); 607 x->props.reqid = p->reqid; 608 x->props.family = p->family; 609 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr)); 610 x->props.flags = p->flags; 611 612 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC)) 613 x->sel.family = p->family; 614} 615 616/* 617 * someday when pfkey also has support, we could have the code 618 * somehow made shareable and move it to xfrm_state.c - JHS 619 * 620*/ 621static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs, 622 int update_esn) 623{ 624 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL]; 625 struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL; 626 struct nlattr *lt = attrs[XFRMA_LTIME_VAL]; 627 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH]; 628 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH]; 629 struct nlattr *mt = attrs[XFRMA_MTIMER_THRESH]; 630 631 if (re && x->replay_esn && x->preplay_esn) { 632 struct xfrm_replay_state_esn *replay_esn; 633 replay_esn = nla_data(re); 634 memcpy(x->replay_esn, replay_esn, 635 xfrm_replay_state_esn_len(replay_esn)); 636 memcpy(x->preplay_esn, replay_esn, 637 xfrm_replay_state_esn_len(replay_esn)); 638 } 639 640 if (rp) { 641 struct xfrm_replay_state *replay; 642 replay = nla_data(rp); 643 memcpy(&x->replay, replay, sizeof(*replay)); 644 memcpy(&x->preplay, replay, sizeof(*replay)); 645 } 646 647 if (lt) { 648 struct xfrm_lifetime_cur *ltime; 649 ltime = nla_data(lt); 650 x->curlft.bytes = ltime->bytes; 651 x->curlft.packets = ltime->packets; 652 x->curlft.add_time = ltime->add_time; 653 x->curlft.use_time = ltime->use_time; 654 } 655 656 if (et) 657 x->replay_maxage = nla_get_u32(et); 658 659 if (rt) 660 x->replay_maxdiff = nla_get_u32(rt); 661 662 if (mt) 663 x->mapping_maxage = nla_get_u32(mt); 664} 665 666static void xfrm_smark_init(struct nlattr **attrs, struct xfrm_mark *m) 667{ 668 if (attrs[XFRMA_SET_MARK]) { 669 m->v = nla_get_u32(attrs[XFRMA_SET_MARK]); 670 if (attrs[XFRMA_SET_MARK_MASK]) 671 m->m = nla_get_u32(attrs[XFRMA_SET_MARK_MASK]); 672 else 673 m->m = 0xffffffff; 674 } else { 675 m->v = m->m = 0; 676 } 677} 678 679static struct xfrm_state *xfrm_state_construct(struct net *net, 680 struct xfrm_usersa_info *p, 681 struct nlattr **attrs, 682 int *errp, 683 struct netlink_ext_ack *extack) 684{ 685 struct xfrm_state *x = xfrm_state_alloc(net); 686 int err = -ENOMEM; 687 688 if (!x) 689 goto error_no_put; 690 691 copy_from_user_state(x, p); 692 693 if (attrs[XFRMA_ENCAP]) { 694 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]), 695 sizeof(*x->encap), GFP_KERNEL); 696 if (x->encap == NULL) 697 goto error; 698 } 699 700 if (attrs[XFRMA_COADDR]) { 701 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]), 702 sizeof(*x->coaddr), GFP_KERNEL); 703 if (x->coaddr == NULL) 704 goto error; 705 } 706 707 if (attrs[XFRMA_SA_EXTRA_FLAGS]) 708 x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]); 709 710 if ((err = attach_aead(x, attrs[XFRMA_ALG_AEAD], extack))) 711 goto error; 712 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo, 713 attrs[XFRMA_ALG_AUTH_TRUNC], extack))) 714 goto error; 715 if (!x->props.aalgo) { 716 if ((err = attach_auth(&x->aalg, &x->props.aalgo, 717 attrs[XFRMA_ALG_AUTH], extack))) 718 goto error; 719 } 720 if ((err = attach_crypt(x, attrs[XFRMA_ALG_CRYPT], extack))) 721 goto error; 722 if ((err = attach_one_algo(&x->calg, &x->props.calgo, 723 xfrm_calg_get_byname, 724 attrs[XFRMA_ALG_COMP], extack))) 725 goto error; 726 727 if (attrs[XFRMA_TFCPAD]) 728 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]); 729 730 xfrm_mark_get(attrs, &x->mark); 731 732 xfrm_smark_init(attrs, &x->props.smark); 733 734 if (attrs[XFRMA_IF_ID]) 735 x->if_id = nla_get_u32(attrs[XFRMA_IF_ID]); 736 737 err = __xfrm_init_state(x, false, attrs[XFRMA_OFFLOAD_DEV], extack); 738 if (err) 739 goto error; 740 741 if (attrs[XFRMA_SEC_CTX]) { 742 err = security_xfrm_state_alloc(x, 743 nla_data(attrs[XFRMA_SEC_CTX])); 744 if (err) 745 goto error; 746 } 747 748 if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn, 749 attrs[XFRMA_REPLAY_ESN_VAL]))) 750 goto error; 751 752 x->km.seq = p->seq; 753 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth; 754 /* sysctl_xfrm_aevent_etime is in 100ms units */ 755 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M; 756 757 if ((err = xfrm_init_replay(x, extack))) 758 goto error; 759 760 /* override default values from above */ 761 xfrm_update_ae_params(x, attrs, 0); 762 763 /* configure the hardware if offload is requested */ 764 if (attrs[XFRMA_OFFLOAD_DEV]) { 765 err = xfrm_dev_state_add(net, x, 766 nla_data(attrs[XFRMA_OFFLOAD_DEV]), 767 extack); 768 if (err) 769 goto error; 770 } 771 772 return x; 773 774error: 775 x->km.state = XFRM_STATE_DEAD; 776 xfrm_state_put(x); 777error_no_put: 778 *errp = err; 779 return NULL; 780} 781 782static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 783 struct nlattr **attrs, struct netlink_ext_ack *extack) 784{ 785 struct net *net = sock_net(skb->sk); 786 struct xfrm_usersa_info *p = nlmsg_data(nlh); 787 struct xfrm_state *x; 788 int err; 789 struct km_event c; 790 791 err = verify_newsa_info(p, attrs, extack); 792 if (err) 793 return err; 794 795 x = xfrm_state_construct(net, p, attrs, &err, extack); 796 if (!x) 797 return err; 798 799 xfrm_state_hold(x); 800 if (nlh->nlmsg_type == XFRM_MSG_NEWSA) 801 err = xfrm_state_add(x); 802 else 803 err = xfrm_state_update(x); 804 805 xfrm_audit_state_add(x, err ? 0 : 1, true); 806 807 if (err < 0) { 808 x->km.state = XFRM_STATE_DEAD; 809 xfrm_dev_state_delete(x); 810 __xfrm_state_put(x); 811 goto out; 812 } 813 814 if (x->km.state == XFRM_STATE_VOID) 815 x->km.state = XFRM_STATE_VALID; 816 817 c.seq = nlh->nlmsg_seq; 818 c.portid = nlh->nlmsg_pid; 819 c.event = nlh->nlmsg_type; 820 821 km_state_notify(x, &c); 822out: 823 xfrm_state_put(x); 824 return err; 825} 826 827static struct xfrm_state *xfrm_user_state_lookup(struct net *net, 828 struct xfrm_usersa_id *p, 829 struct nlattr **attrs, 830 int *errp) 831{ 832 struct xfrm_state *x = NULL; 833 struct xfrm_mark m; 834 int err; 835 u32 mark = xfrm_mark_get(attrs, &m); 836 837 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) { 838 err = -ESRCH; 839 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family); 840 } else { 841 xfrm_address_t *saddr = NULL; 842 843 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr); 844 if (!saddr) { 845 err = -EINVAL; 846 goto out; 847 } 848 849 err = -ESRCH; 850 x = xfrm_state_lookup_byaddr(net, mark, 851 &p->daddr, saddr, 852 p->proto, p->family); 853 } 854 855 out: 856 if (!x && errp) 857 *errp = err; 858 return x; 859} 860 861static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 862 struct nlattr **attrs, struct netlink_ext_ack *extack) 863{ 864 struct net *net = sock_net(skb->sk); 865 struct xfrm_state *x; 866 int err = -ESRCH; 867 struct km_event c; 868 struct xfrm_usersa_id *p = nlmsg_data(nlh); 869 870 x = xfrm_user_state_lookup(net, p, attrs, &err); 871 if (x == NULL) 872 return err; 873 874 if ((err = security_xfrm_state_delete(x)) != 0) 875 goto out; 876 877 if (xfrm_state_kern(x)) { 878 NL_SET_ERR_MSG(extack, "SA is in use by tunnels"); 879 err = -EPERM; 880 goto out; 881 } 882 883 err = xfrm_state_delete(x); 884 if (err < 0) 885 goto out; 886 887 c.seq = nlh->nlmsg_seq; 888 c.portid = nlh->nlmsg_pid; 889 c.event = nlh->nlmsg_type; 890 km_state_notify(x, &c); 891 892out: 893 xfrm_audit_state_delete(x, err ? 0 : 1, true); 894 xfrm_state_put(x); 895 return err; 896} 897 898static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p) 899{ 900 memset(p, 0, sizeof(*p)); 901 memcpy(&p->id, &x->id, sizeof(p->id)); 902 memcpy(&p->sel, &x->sel, sizeof(p->sel)); 903 memcpy(&p->lft, &x->lft, sizeof(p->lft)); 904 if (x->xso.dev) 905 xfrm_dev_state_update_curlft(x); 906 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft)); 907 put_unaligned(x->stats.replay_window, &p->stats.replay_window); 908 put_unaligned(x->stats.replay, &p->stats.replay); 909 put_unaligned(x->stats.integrity_failed, &p->stats.integrity_failed); 910 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr)); 911 p->mode = x->props.mode; 912 p->replay_window = x->props.replay_window; 913 p->reqid = x->props.reqid; 914 p->family = x->props.family; 915 p->flags = x->props.flags; 916 p->seq = x->km.seq; 917} 918 919struct xfrm_dump_info { 920 struct sk_buff *in_skb; 921 struct sk_buff *out_skb; 922 u32 nlmsg_seq; 923 u16 nlmsg_flags; 924}; 925 926static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb) 927{ 928 struct xfrm_user_sec_ctx *uctx; 929 struct nlattr *attr; 930 int ctx_size = sizeof(*uctx) + s->ctx_len; 931 932 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size); 933 if (attr == NULL) 934 return -EMSGSIZE; 935 936 uctx = nla_data(attr); 937 uctx->exttype = XFRMA_SEC_CTX; 938 uctx->len = ctx_size; 939 uctx->ctx_doi = s->ctx_doi; 940 uctx->ctx_alg = s->ctx_alg; 941 uctx->ctx_len = s->ctx_len; 942 memcpy(uctx + 1, s->ctx_str, s->ctx_len); 943 944 return 0; 945} 946 947static int copy_user_offload(struct xfrm_dev_offload *xso, struct sk_buff *skb) 948{ 949 struct xfrm_user_offload *xuo; 950 struct nlattr *attr; 951 952 attr = nla_reserve(skb, XFRMA_OFFLOAD_DEV, sizeof(*xuo)); 953 if (attr == NULL) 954 return -EMSGSIZE; 955 956 xuo = nla_data(attr); 957 memset(xuo, 0, sizeof(*xuo)); 958 xuo->ifindex = xso->dev->ifindex; 959 if (xso->dir == XFRM_DEV_OFFLOAD_IN) 960 xuo->flags = XFRM_OFFLOAD_INBOUND; 961 if (xso->type == XFRM_DEV_OFFLOAD_PACKET) 962 xuo->flags |= XFRM_OFFLOAD_PACKET; 963 964 return 0; 965} 966 967static bool xfrm_redact(void) 968{ 969 return IS_ENABLED(CONFIG_SECURITY) && 970 security_locked_down(LOCKDOWN_XFRM_SECRET); 971} 972 973static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb) 974{ 975 struct xfrm_algo *algo; 976 struct xfrm_algo_auth *ap; 977 struct nlattr *nla; 978 bool redact_secret = xfrm_redact(); 979 980 nla = nla_reserve(skb, XFRMA_ALG_AUTH, 981 sizeof(*algo) + (auth->alg_key_len + 7) / 8); 982 if (!nla) 983 return -EMSGSIZE; 984 algo = nla_data(nla); 985 strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name)); 986 987 if (redact_secret && auth->alg_key_len) 988 memset(algo->alg_key, 0, (auth->alg_key_len + 7) / 8); 989 else 990 memcpy(algo->alg_key, auth->alg_key, 991 (auth->alg_key_len + 7) / 8); 992 algo->alg_key_len = auth->alg_key_len; 993 994 nla = nla_reserve(skb, XFRMA_ALG_AUTH_TRUNC, xfrm_alg_auth_len(auth)); 995 if (!nla) 996 return -EMSGSIZE; 997 ap = nla_data(nla); 998 memcpy(ap, auth, sizeof(struct xfrm_algo_auth)); 999 if (redact_secret && auth->alg_key_len) 1000 memset(ap->alg_key, 0, (auth->alg_key_len + 7) / 8); 1001 else 1002 memcpy(ap->alg_key, auth->alg_key, 1003 (auth->alg_key_len + 7) / 8); 1004 return 0; 1005} 1006 1007static int copy_to_user_aead(struct xfrm_algo_aead *aead, struct sk_buff *skb) 1008{ 1009 struct nlattr *nla = nla_reserve(skb, XFRMA_ALG_AEAD, aead_len(aead)); 1010 struct xfrm_algo_aead *ap; 1011 bool redact_secret = xfrm_redact(); 1012 1013 if (!nla) 1014 return -EMSGSIZE; 1015 1016 ap = nla_data(nla); 1017 strscpy_pad(ap->alg_name, aead->alg_name, sizeof(ap->alg_name)); 1018 ap->alg_key_len = aead->alg_key_len; 1019 ap->alg_icv_len = aead->alg_icv_len; 1020 1021 if (redact_secret && aead->alg_key_len) 1022 memset(ap->alg_key, 0, (aead->alg_key_len + 7) / 8); 1023 else 1024 memcpy(ap->alg_key, aead->alg_key, 1025 (aead->alg_key_len + 7) / 8); 1026 return 0; 1027} 1028 1029static int copy_to_user_ealg(struct xfrm_algo *ealg, struct sk_buff *skb) 1030{ 1031 struct xfrm_algo *ap; 1032 bool redact_secret = xfrm_redact(); 1033 struct nlattr *nla = nla_reserve(skb, XFRMA_ALG_CRYPT, 1034 xfrm_alg_len(ealg)); 1035 if (!nla) 1036 return -EMSGSIZE; 1037 1038 ap = nla_data(nla); 1039 strscpy_pad(ap->alg_name, ealg->alg_name, sizeof(ap->alg_name)); 1040 ap->alg_key_len = ealg->alg_key_len; 1041 1042 if (redact_secret && ealg->alg_key_len) 1043 memset(ap->alg_key, 0, (ealg->alg_key_len + 7) / 8); 1044 else 1045 memcpy(ap->alg_key, ealg->alg_key, 1046 (ealg->alg_key_len + 7) / 8); 1047 1048 return 0; 1049} 1050 1051static int copy_to_user_calg(struct xfrm_algo *calg, struct sk_buff *skb) 1052{ 1053 struct nlattr *nla = nla_reserve(skb, XFRMA_ALG_COMP, sizeof(*calg)); 1054 struct xfrm_algo *ap; 1055 1056 if (!nla) 1057 return -EMSGSIZE; 1058 1059 ap = nla_data(nla); 1060 strscpy_pad(ap->alg_name, calg->alg_name, sizeof(ap->alg_name)); 1061 ap->alg_key_len = 0; 1062 1063 return 0; 1064} 1065 1066static int copy_to_user_encap(struct xfrm_encap_tmpl *ep, struct sk_buff *skb) 1067{ 1068 struct nlattr *nla = nla_reserve(skb, XFRMA_ENCAP, sizeof(*ep)); 1069 struct xfrm_encap_tmpl *uep; 1070 1071 if (!nla) 1072 return -EMSGSIZE; 1073 1074 uep = nla_data(nla); 1075 memset(uep, 0, sizeof(*uep)); 1076 1077 uep->encap_type = ep->encap_type; 1078 uep->encap_sport = ep->encap_sport; 1079 uep->encap_dport = ep->encap_dport; 1080 uep->encap_oa = ep->encap_oa; 1081 1082 return 0; 1083} 1084 1085static int xfrm_smark_put(struct sk_buff *skb, struct xfrm_mark *m) 1086{ 1087 int ret = 0; 1088 1089 if (m->v | m->m) { 1090 ret = nla_put_u32(skb, XFRMA_SET_MARK, m->v); 1091 if (!ret) 1092 ret = nla_put_u32(skb, XFRMA_SET_MARK_MASK, m->m); 1093 } 1094 return ret; 1095} 1096 1097/* Don't change this without updating xfrm_sa_len! */ 1098static int copy_to_user_state_extra(struct xfrm_state *x, 1099 struct xfrm_usersa_info *p, 1100 struct sk_buff *skb) 1101{ 1102 int ret = 0; 1103 1104 copy_to_user_state(x, p); 1105 1106 if (x->props.extra_flags) { 1107 ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS, 1108 x->props.extra_flags); 1109 if (ret) 1110 goto out; 1111 } 1112 1113 if (x->coaddr) { 1114 ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr); 1115 if (ret) 1116 goto out; 1117 } 1118 if (x->lastused) { 1119 ret = nla_put_u64_64bit(skb, XFRMA_LASTUSED, x->lastused, 1120 XFRMA_PAD); 1121 if (ret) 1122 goto out; 1123 } 1124 if (x->aead) { 1125 ret = copy_to_user_aead(x->aead, skb); 1126 if (ret) 1127 goto out; 1128 } 1129 if (x->aalg) { 1130 ret = copy_to_user_auth(x->aalg, skb); 1131 if (ret) 1132 goto out; 1133 } 1134 if (x->ealg) { 1135 ret = copy_to_user_ealg(x->ealg, skb); 1136 if (ret) 1137 goto out; 1138 } 1139 if (x->calg) { 1140 ret = copy_to_user_calg(x->calg, skb); 1141 if (ret) 1142 goto out; 1143 } 1144 if (x->encap) { 1145 ret = copy_to_user_encap(x->encap, skb); 1146 if (ret) 1147 goto out; 1148 } 1149 if (x->tfcpad) { 1150 ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad); 1151 if (ret) 1152 goto out; 1153 } 1154 ret = xfrm_mark_put(skb, &x->mark); 1155 if (ret) 1156 goto out; 1157 1158 ret = xfrm_smark_put(skb, &x->props.smark); 1159 if (ret) 1160 goto out; 1161 1162 if (x->replay_esn) 1163 ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL, 1164 xfrm_replay_state_esn_len(x->replay_esn), 1165 x->replay_esn); 1166 else 1167 ret = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), 1168 &x->replay); 1169 if (ret) 1170 goto out; 1171 if(x->xso.dev) 1172 ret = copy_user_offload(&x->xso, skb); 1173 if (ret) 1174 goto out; 1175 if (x->if_id) { 1176 ret = nla_put_u32(skb, XFRMA_IF_ID, x->if_id); 1177 if (ret) 1178 goto out; 1179 } 1180 if (x->security) { 1181 ret = copy_sec_ctx(x->security, skb); 1182 if (ret) 1183 goto out; 1184 } 1185 if (x->mapping_maxage) 1186 ret = nla_put_u32(skb, XFRMA_MTIMER_THRESH, x->mapping_maxage); 1187out: 1188 return ret; 1189} 1190 1191static int dump_one_state(struct xfrm_state *x, int count, void *ptr) 1192{ 1193 struct xfrm_dump_info *sp = ptr; 1194 struct sk_buff *in_skb = sp->in_skb; 1195 struct sk_buff *skb = sp->out_skb; 1196 struct xfrm_translator *xtr; 1197 struct xfrm_usersa_info *p; 1198 struct nlmsghdr *nlh; 1199 int err; 1200 1201 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq, 1202 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags); 1203 if (nlh == NULL) 1204 return -EMSGSIZE; 1205 1206 p = nlmsg_data(nlh); 1207 1208 err = copy_to_user_state_extra(x, p, skb); 1209 if (err) { 1210 nlmsg_cancel(skb, nlh); 1211 return err; 1212 } 1213 nlmsg_end(skb, nlh); 1214 1215 xtr = xfrm_get_translator(); 1216 if (xtr) { 1217 err = xtr->alloc_compat(skb, nlh); 1218 1219 xfrm_put_translator(xtr); 1220 if (err) { 1221 nlmsg_cancel(skb, nlh); 1222 return err; 1223 } 1224 } 1225 1226 return 0; 1227} 1228 1229static int xfrm_dump_sa_done(struct netlink_callback *cb) 1230{ 1231 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1]; 1232 struct sock *sk = cb->skb->sk; 1233 struct net *net = sock_net(sk); 1234 1235 if (cb->args[0]) 1236 xfrm_state_walk_done(walk, net); 1237 return 0; 1238} 1239 1240static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb) 1241{ 1242 struct net *net = sock_net(skb->sk); 1243 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1]; 1244 struct xfrm_dump_info info; 1245 1246 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) > 1247 sizeof(cb->args) - sizeof(cb->args[0])); 1248 1249 info.in_skb = cb->skb; 1250 info.out_skb = skb; 1251 info.nlmsg_seq = cb->nlh->nlmsg_seq; 1252 info.nlmsg_flags = NLM_F_MULTI; 1253 1254 if (!cb->args[0]) { 1255 struct nlattr *attrs[XFRMA_MAX+1]; 1256 struct xfrm_address_filter *filter = NULL; 1257 u8 proto = 0; 1258 int err; 1259 1260 err = nlmsg_parse_deprecated(cb->nlh, 0, attrs, XFRMA_MAX, 1261 xfrma_policy, cb->extack); 1262 if (err < 0) 1263 return err; 1264 1265 if (attrs[XFRMA_ADDRESS_FILTER]) { 1266 filter = kmemdup(nla_data(attrs[XFRMA_ADDRESS_FILTER]), 1267 sizeof(*filter), GFP_KERNEL); 1268 if (filter == NULL) 1269 return -ENOMEM; 1270 1271 /* see addr_match(), (prefix length >> 5) << 2 1272 * will be used to compare xfrm_address_t 1273 */ 1274 if (filter->splen > (sizeof(xfrm_address_t) << 3) || 1275 filter->dplen > (sizeof(xfrm_address_t) << 3)) { 1276 kfree(filter); 1277 return -EINVAL; 1278 } 1279 } 1280 1281 if (attrs[XFRMA_PROTO]) 1282 proto = nla_get_u8(attrs[XFRMA_PROTO]); 1283 1284 xfrm_state_walk_init(walk, proto, filter); 1285 cb->args[0] = 1; 1286 } 1287 1288 (void) xfrm_state_walk(net, walk, dump_one_state, &info); 1289 1290 return skb->len; 1291} 1292 1293static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb, 1294 struct xfrm_state *x, u32 seq) 1295{ 1296 struct xfrm_dump_info info; 1297 struct sk_buff *skb; 1298 int err; 1299 1300 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 1301 if (!skb) 1302 return ERR_PTR(-ENOMEM); 1303 1304 info.in_skb = in_skb; 1305 info.out_skb = skb; 1306 info.nlmsg_seq = seq; 1307 info.nlmsg_flags = 0; 1308 1309 err = dump_one_state(x, 0, &info); 1310 if (err) { 1311 kfree_skb(skb); 1312 return ERR_PTR(err); 1313 } 1314 1315 return skb; 1316} 1317 1318/* A wrapper for nlmsg_multicast() checking that nlsk is still available. 1319 * Must be called with RCU read lock. 1320 */ 1321static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb, 1322 u32 pid, unsigned int group) 1323{ 1324 struct sock *nlsk = rcu_dereference(net->xfrm.nlsk); 1325 struct xfrm_translator *xtr; 1326 1327 if (!nlsk) { 1328 kfree_skb(skb); 1329 return -EPIPE; 1330 } 1331 1332 xtr = xfrm_get_translator(); 1333 if (xtr) { 1334 int err = xtr->alloc_compat(skb, nlmsg_hdr(skb)); 1335 1336 xfrm_put_translator(xtr); 1337 if (err) { 1338 kfree_skb(skb); 1339 return err; 1340 } 1341 } 1342 1343 return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC); 1344} 1345 1346static inline unsigned int xfrm_spdinfo_msgsize(void) 1347{ 1348 return NLMSG_ALIGN(4) 1349 + nla_total_size(sizeof(struct xfrmu_spdinfo)) 1350 + nla_total_size(sizeof(struct xfrmu_spdhinfo)) 1351 + nla_total_size(sizeof(struct xfrmu_spdhthresh)) 1352 + nla_total_size(sizeof(struct xfrmu_spdhthresh)); 1353} 1354 1355static int build_spdinfo(struct sk_buff *skb, struct net *net, 1356 u32 portid, u32 seq, u32 flags) 1357{ 1358 struct xfrmk_spdinfo si; 1359 struct xfrmu_spdinfo spc; 1360 struct xfrmu_spdhinfo sph; 1361 struct xfrmu_spdhthresh spt4, spt6; 1362 struct nlmsghdr *nlh; 1363 int err; 1364 u32 *f; 1365 unsigned lseq; 1366 1367 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0); 1368 if (nlh == NULL) /* shouldn't really happen ... */ 1369 return -EMSGSIZE; 1370 1371 f = nlmsg_data(nlh); 1372 *f = flags; 1373 xfrm_spd_getinfo(net, &si); 1374 spc.incnt = si.incnt; 1375 spc.outcnt = si.outcnt; 1376 spc.fwdcnt = si.fwdcnt; 1377 spc.inscnt = si.inscnt; 1378 spc.outscnt = si.outscnt; 1379 spc.fwdscnt = si.fwdscnt; 1380 sph.spdhcnt = si.spdhcnt; 1381 sph.spdhmcnt = si.spdhmcnt; 1382 1383 do { 1384 lseq = read_seqbegin(&net->xfrm.policy_hthresh.lock); 1385 1386 spt4.lbits = net->xfrm.policy_hthresh.lbits4; 1387 spt4.rbits = net->xfrm.policy_hthresh.rbits4; 1388 spt6.lbits = net->xfrm.policy_hthresh.lbits6; 1389 spt6.rbits = net->xfrm.policy_hthresh.rbits6; 1390 } while (read_seqretry(&net->xfrm.policy_hthresh.lock, lseq)); 1391 1392 err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc); 1393 if (!err) 1394 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph); 1395 if (!err) 1396 err = nla_put(skb, XFRMA_SPD_IPV4_HTHRESH, sizeof(spt4), &spt4); 1397 if (!err) 1398 err = nla_put(skb, XFRMA_SPD_IPV6_HTHRESH, sizeof(spt6), &spt6); 1399 if (err) { 1400 nlmsg_cancel(skb, nlh); 1401 return err; 1402 } 1403 1404 nlmsg_end(skb, nlh); 1405 return 0; 1406} 1407 1408static int xfrm_set_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh, 1409 struct nlattr **attrs, 1410 struct netlink_ext_ack *extack) 1411{ 1412 struct net *net = sock_net(skb->sk); 1413 struct xfrmu_spdhthresh *thresh4 = NULL; 1414 struct xfrmu_spdhthresh *thresh6 = NULL; 1415 1416 /* selector prefixlen thresholds to hash policies */ 1417 if (attrs[XFRMA_SPD_IPV4_HTHRESH]) { 1418 struct nlattr *rta = attrs[XFRMA_SPD_IPV4_HTHRESH]; 1419 1420 if (nla_len(rta) < sizeof(*thresh4)) { 1421 NL_SET_ERR_MSG(extack, "Invalid SPD_IPV4_HTHRESH attribute length"); 1422 return -EINVAL; 1423 } 1424 thresh4 = nla_data(rta); 1425 if (thresh4->lbits > 32 || thresh4->rbits > 32) { 1426 NL_SET_ERR_MSG(extack, "Invalid hash threshold (must be <= 32 for IPv4)"); 1427 return -EINVAL; 1428 } 1429 } 1430 if (attrs[XFRMA_SPD_IPV6_HTHRESH]) { 1431 struct nlattr *rta = attrs[XFRMA_SPD_IPV6_HTHRESH]; 1432 1433 if (nla_len(rta) < sizeof(*thresh6)) { 1434 NL_SET_ERR_MSG(extack, "Invalid SPD_IPV6_HTHRESH attribute length"); 1435 return -EINVAL; 1436 } 1437 thresh6 = nla_data(rta); 1438 if (thresh6->lbits > 128 || thresh6->rbits > 128) { 1439 NL_SET_ERR_MSG(extack, "Invalid hash threshold (must be <= 128 for IPv6)"); 1440 return -EINVAL; 1441 } 1442 } 1443 1444 if (thresh4 || thresh6) { 1445 write_seqlock(&net->xfrm.policy_hthresh.lock); 1446 if (thresh4) { 1447 net->xfrm.policy_hthresh.lbits4 = thresh4->lbits; 1448 net->xfrm.policy_hthresh.rbits4 = thresh4->rbits; 1449 } 1450 if (thresh6) { 1451 net->xfrm.policy_hthresh.lbits6 = thresh6->lbits; 1452 net->xfrm.policy_hthresh.rbits6 = thresh6->rbits; 1453 } 1454 write_sequnlock(&net->xfrm.policy_hthresh.lock); 1455 1456 xfrm_policy_hash_rebuild(net); 1457 } 1458 1459 return 0; 1460} 1461 1462static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh, 1463 struct nlattr **attrs, 1464 struct netlink_ext_ack *extack) 1465{ 1466 struct net *net = sock_net(skb->sk); 1467 struct sk_buff *r_skb; 1468 u32 *flags = nlmsg_data(nlh); 1469 u32 sportid = NETLINK_CB(skb).portid; 1470 u32 seq = nlh->nlmsg_seq; 1471 int err; 1472 1473 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC); 1474 if (r_skb == NULL) 1475 return -ENOMEM; 1476 1477 err = build_spdinfo(r_skb, net, sportid, seq, *flags); 1478 BUG_ON(err < 0); 1479 1480 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid); 1481} 1482 1483static inline unsigned int xfrm_sadinfo_msgsize(void) 1484{ 1485 return NLMSG_ALIGN(4) 1486 + nla_total_size(sizeof(struct xfrmu_sadhinfo)) 1487 + nla_total_size(4); /* XFRMA_SAD_CNT */ 1488} 1489 1490static int build_sadinfo(struct sk_buff *skb, struct net *net, 1491 u32 portid, u32 seq, u32 flags) 1492{ 1493 struct xfrmk_sadinfo si; 1494 struct xfrmu_sadhinfo sh; 1495 struct nlmsghdr *nlh; 1496 int err; 1497 u32 *f; 1498 1499 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0); 1500 if (nlh == NULL) /* shouldn't really happen ... */ 1501 return -EMSGSIZE; 1502 1503 f = nlmsg_data(nlh); 1504 *f = flags; 1505 xfrm_sad_getinfo(net, &si); 1506 1507 sh.sadhmcnt = si.sadhmcnt; 1508 sh.sadhcnt = si.sadhcnt; 1509 1510 err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt); 1511 if (!err) 1512 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh); 1513 if (err) { 1514 nlmsg_cancel(skb, nlh); 1515 return err; 1516 } 1517 1518 nlmsg_end(skb, nlh); 1519 return 0; 1520} 1521 1522static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh, 1523 struct nlattr **attrs, 1524 struct netlink_ext_ack *extack) 1525{ 1526 struct net *net = sock_net(skb->sk); 1527 struct sk_buff *r_skb; 1528 u32 *flags = nlmsg_data(nlh); 1529 u32 sportid = NETLINK_CB(skb).portid; 1530 u32 seq = nlh->nlmsg_seq; 1531 int err; 1532 1533 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC); 1534 if (r_skb == NULL) 1535 return -ENOMEM; 1536 1537 err = build_sadinfo(r_skb, net, sportid, seq, *flags); 1538 BUG_ON(err < 0); 1539 1540 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid); 1541} 1542 1543static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 1544 struct nlattr **attrs, struct netlink_ext_ack *extack) 1545{ 1546 struct net *net = sock_net(skb->sk); 1547 struct xfrm_usersa_id *p = nlmsg_data(nlh); 1548 struct xfrm_state *x; 1549 struct sk_buff *resp_skb; 1550 int err = -ESRCH; 1551 1552 x = xfrm_user_state_lookup(net, p, attrs, &err); 1553 if (x == NULL) 1554 goto out_noput; 1555 1556 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); 1557 if (IS_ERR(resp_skb)) { 1558 err = PTR_ERR(resp_skb); 1559 } else { 1560 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid); 1561 } 1562 xfrm_state_put(x); 1563out_noput: 1564 return err; 1565} 1566 1567static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh, 1568 struct nlattr **attrs, 1569 struct netlink_ext_ack *extack) 1570{ 1571 struct net *net = sock_net(skb->sk); 1572 struct xfrm_state *x; 1573 struct xfrm_userspi_info *p; 1574 struct xfrm_translator *xtr; 1575 struct sk_buff *resp_skb; 1576 xfrm_address_t *daddr; 1577 int family; 1578 int err; 1579 u32 mark; 1580 struct xfrm_mark m; 1581 u32 if_id = 0; 1582 1583 p = nlmsg_data(nlh); 1584 err = verify_spi_info(p->info.id.proto, p->min, p->max, extack); 1585 if (err) 1586 goto out_noput; 1587 1588 family = p->info.family; 1589 daddr = &p->info.id.daddr; 1590 1591 x = NULL; 1592 1593 mark = xfrm_mark_get(attrs, &m); 1594 1595 if (attrs[XFRMA_IF_ID]) 1596 if_id = nla_get_u32(attrs[XFRMA_IF_ID]); 1597 1598 if (p->info.seq) { 1599 x = xfrm_find_acq_byseq(net, mark, p->info.seq); 1600 if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) { 1601 xfrm_state_put(x); 1602 x = NULL; 1603 } 1604 } 1605 1606 if (!x) 1607 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid, 1608 if_id, p->info.id.proto, daddr, 1609 &p->info.saddr, 1, 1610 family); 1611 err = -ENOENT; 1612 if (!x) { 1613 NL_SET_ERR_MSG(extack, "Target ACQUIRE not found"); 1614 goto out_noput; 1615 } 1616 1617 err = xfrm_alloc_spi(x, p->min, p->max, extack); 1618 if (err) 1619 goto out; 1620 1621 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); 1622 if (IS_ERR(resp_skb)) { 1623 err = PTR_ERR(resp_skb); 1624 goto out; 1625 } 1626 1627 xtr = xfrm_get_translator(); 1628 if (xtr) { 1629 err = xtr->alloc_compat(skb, nlmsg_hdr(skb)); 1630 1631 xfrm_put_translator(xtr); 1632 if (err) { 1633 kfree_skb(resp_skb); 1634 goto out; 1635 } 1636 } 1637 1638 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid); 1639 1640out: 1641 xfrm_state_put(x); 1642out_noput: 1643 return err; 1644} 1645 1646static int verify_policy_dir(u8 dir, struct netlink_ext_ack *extack) 1647{ 1648 switch (dir) { 1649 case XFRM_POLICY_IN: 1650 case XFRM_POLICY_OUT: 1651 case XFRM_POLICY_FWD: 1652 break; 1653 1654 default: 1655 NL_SET_ERR_MSG(extack, "Invalid policy direction"); 1656 return -EINVAL; 1657 } 1658 1659 return 0; 1660} 1661 1662static int verify_policy_type(u8 type, struct netlink_ext_ack *extack) 1663{ 1664 switch (type) { 1665 case XFRM_POLICY_TYPE_MAIN: 1666#ifdef CONFIG_XFRM_SUB_POLICY 1667 case XFRM_POLICY_TYPE_SUB: 1668#endif 1669 break; 1670 1671 default: 1672 NL_SET_ERR_MSG(extack, "Invalid policy type"); 1673 return -EINVAL; 1674 } 1675 1676 return 0; 1677} 1678 1679static int verify_newpolicy_info(struct xfrm_userpolicy_info *p, 1680 struct netlink_ext_ack *extack) 1681{ 1682 int ret; 1683 1684 switch (p->share) { 1685 case XFRM_SHARE_ANY: 1686 case XFRM_SHARE_SESSION: 1687 case XFRM_SHARE_USER: 1688 case XFRM_SHARE_UNIQUE: 1689 break; 1690 1691 default: 1692 NL_SET_ERR_MSG(extack, "Invalid policy share"); 1693 return -EINVAL; 1694 } 1695 1696 switch (p->action) { 1697 case XFRM_POLICY_ALLOW: 1698 case XFRM_POLICY_BLOCK: 1699 break; 1700 1701 default: 1702 NL_SET_ERR_MSG(extack, "Invalid policy action"); 1703 return -EINVAL; 1704 } 1705 1706 switch (p->sel.family) { 1707 case AF_INET: 1708 if (p->sel.prefixlen_d > 32 || p->sel.prefixlen_s > 32) { 1709 NL_SET_ERR_MSG(extack, "Invalid prefix length in selector (must be <= 32 for IPv4)"); 1710 return -EINVAL; 1711 } 1712 1713 break; 1714 1715 case AF_INET6: 1716#if IS_ENABLED(CONFIG_IPV6) 1717 if (p->sel.prefixlen_d > 128 || p->sel.prefixlen_s > 128) { 1718 NL_SET_ERR_MSG(extack, "Invalid prefix length in selector (must be <= 128 for IPv6)"); 1719 return -EINVAL; 1720 } 1721 1722 break; 1723#else 1724 NL_SET_ERR_MSG(extack, "IPv6 support disabled"); 1725 return -EAFNOSUPPORT; 1726#endif 1727 1728 default: 1729 NL_SET_ERR_MSG(extack, "Invalid selector family"); 1730 return -EINVAL; 1731 } 1732 1733 ret = verify_policy_dir(p->dir, extack); 1734 if (ret) 1735 return ret; 1736 if (p->index && (xfrm_policy_id2dir(p->index) != p->dir)) { 1737 NL_SET_ERR_MSG(extack, "Policy index doesn't match direction"); 1738 return -EINVAL; 1739 } 1740 1741 return 0; 1742} 1743 1744static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs) 1745{ 1746 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 1747 struct xfrm_user_sec_ctx *uctx; 1748 1749 if (!rt) 1750 return 0; 1751 1752 uctx = nla_data(rt); 1753 return security_xfrm_policy_alloc(&pol->security, uctx, GFP_KERNEL); 1754} 1755 1756static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut, 1757 int nr) 1758{ 1759 int i; 1760 1761 xp->xfrm_nr = nr; 1762 for (i = 0; i < nr; i++, ut++) { 1763 struct xfrm_tmpl *t = &xp->xfrm_vec[i]; 1764 1765 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id)); 1766 memcpy(&t->saddr, &ut->saddr, 1767 sizeof(xfrm_address_t)); 1768 t->reqid = ut->reqid; 1769 t->mode = ut->mode; 1770 t->share = ut->share; 1771 t->optional = ut->optional; 1772 t->aalgos = ut->aalgos; 1773 t->ealgos = ut->ealgos; 1774 t->calgos = ut->calgos; 1775 /* If all masks are ~0, then we allow all algorithms. */ 1776 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos); 1777 t->encap_family = ut->family; 1778 } 1779} 1780 1781static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family, 1782 int dir, struct netlink_ext_ack *extack) 1783{ 1784 u16 prev_family; 1785 int i; 1786 1787 if (nr > XFRM_MAX_DEPTH) { 1788 NL_SET_ERR_MSG(extack, "Template count must be <= XFRM_MAX_DEPTH (" __stringify(XFRM_MAX_DEPTH) ")"); 1789 return -EINVAL; 1790 } 1791 1792 prev_family = family; 1793 1794 for (i = 0; i < nr; i++) { 1795 /* We never validated the ut->family value, so many 1796 * applications simply leave it at zero. The check was 1797 * never made and ut->family was ignored because all 1798 * templates could be assumed to have the same family as 1799 * the policy itself. Now that we will have ipv4-in-ipv6 1800 * and ipv6-in-ipv4 tunnels, this is no longer true. 1801 */ 1802 if (!ut[i].family) 1803 ut[i].family = family; 1804 1805 switch (ut[i].mode) { 1806 case XFRM_MODE_TUNNEL: 1807 case XFRM_MODE_BEET: 1808 if (ut[i].optional && dir == XFRM_POLICY_OUT) { 1809 NL_SET_ERR_MSG(extack, "Mode in optional template not allowed in outbound policy"); 1810 return -EINVAL; 1811 } 1812 break; 1813 default: 1814 if (ut[i].family != prev_family) { 1815 NL_SET_ERR_MSG(extack, "Mode in template doesn't support a family change"); 1816 return -EINVAL; 1817 } 1818 break; 1819 } 1820 if (ut[i].mode >= XFRM_MODE_MAX) { 1821 NL_SET_ERR_MSG(extack, "Mode in template must be < XFRM_MODE_MAX (" __stringify(XFRM_MODE_MAX) ")"); 1822 return -EINVAL; 1823 } 1824 1825 prev_family = ut[i].family; 1826 1827 switch (ut[i].family) { 1828 case AF_INET: 1829 break; 1830#if IS_ENABLED(CONFIG_IPV6) 1831 case AF_INET6: 1832 break; 1833#endif 1834 default: 1835 NL_SET_ERR_MSG(extack, "Invalid family in template"); 1836 return -EINVAL; 1837 } 1838 1839 if (!xfrm_id_proto_valid(ut[i].id.proto)) { 1840 NL_SET_ERR_MSG(extack, "Invalid XFRM protocol in template"); 1841 return -EINVAL; 1842 } 1843 } 1844 1845 return 0; 1846} 1847 1848static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs, 1849 int dir, struct netlink_ext_ack *extack) 1850{ 1851 struct nlattr *rt = attrs[XFRMA_TMPL]; 1852 1853 if (!rt) { 1854 pol->xfrm_nr = 0; 1855 } else { 1856 struct xfrm_user_tmpl *utmpl = nla_data(rt); 1857 int nr = nla_len(rt) / sizeof(*utmpl); 1858 int err; 1859 1860 err = validate_tmpl(nr, utmpl, pol->family, dir, extack); 1861 if (err) 1862 return err; 1863 1864 copy_templates(pol, utmpl, nr); 1865 } 1866 return 0; 1867} 1868 1869static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs, 1870 struct netlink_ext_ack *extack) 1871{ 1872 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE]; 1873 struct xfrm_userpolicy_type *upt; 1874 u8 type = XFRM_POLICY_TYPE_MAIN; 1875 int err; 1876 1877 if (rt) { 1878 upt = nla_data(rt); 1879 type = upt->type; 1880 } 1881 1882 err = verify_policy_type(type, extack); 1883 if (err) 1884 return err; 1885 1886 *tp = type; 1887 return 0; 1888} 1889 1890static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p) 1891{ 1892 xp->priority = p->priority; 1893 xp->index = p->index; 1894 memcpy(&xp->selector, &p->sel, sizeof(xp->selector)); 1895 memcpy(&xp->lft, &p->lft, sizeof(xp->lft)); 1896 xp->action = p->action; 1897 xp->flags = p->flags; 1898 xp->family = p->sel.family; 1899 /* XXX xp->share = p->share; */ 1900} 1901 1902static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir) 1903{ 1904 memset(p, 0, sizeof(*p)); 1905 memcpy(&p->sel, &xp->selector, sizeof(p->sel)); 1906 memcpy(&p->lft, &xp->lft, sizeof(p->lft)); 1907 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft)); 1908 p->priority = xp->priority; 1909 p->index = xp->index; 1910 p->sel.family = xp->family; 1911 p->dir = dir; 1912 p->action = xp->action; 1913 p->flags = xp->flags; 1914 p->share = XFRM_SHARE_ANY; /* XXX xp->share */ 1915} 1916 1917static struct xfrm_policy *xfrm_policy_construct(struct net *net, 1918 struct xfrm_userpolicy_info *p, 1919 struct nlattr **attrs, 1920 int *errp, 1921 struct netlink_ext_ack *extack) 1922{ 1923 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL); 1924 int err; 1925 1926 if (!xp) { 1927 *errp = -ENOMEM; 1928 return NULL; 1929 } 1930 1931 copy_from_user_policy(xp, p); 1932 1933 err = copy_from_user_policy_type(&xp->type, attrs, extack); 1934 if (err) 1935 goto error; 1936 1937 if (!(err = copy_from_user_tmpl(xp, attrs, p->dir, extack))) 1938 err = copy_from_user_sec_ctx(xp, attrs); 1939 if (err) 1940 goto error; 1941 1942 xfrm_mark_get(attrs, &xp->mark); 1943 1944 if (attrs[XFRMA_IF_ID]) 1945 xp->if_id = nla_get_u32(attrs[XFRMA_IF_ID]); 1946 1947 /* configure the hardware if offload is requested */ 1948 if (attrs[XFRMA_OFFLOAD_DEV]) { 1949 err = xfrm_dev_policy_add(net, xp, 1950 nla_data(attrs[XFRMA_OFFLOAD_DEV]), 1951 p->dir, extack); 1952 if (err) 1953 goto error; 1954 } 1955 1956 return xp; 1957 error: 1958 *errp = err; 1959 xp->walk.dead = 1; 1960 xfrm_policy_destroy(xp); 1961 return NULL; 1962} 1963 1964static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 1965 struct nlattr **attrs, 1966 struct netlink_ext_ack *extack) 1967{ 1968 struct net *net = sock_net(skb->sk); 1969 struct xfrm_userpolicy_info *p = nlmsg_data(nlh); 1970 struct xfrm_policy *xp; 1971 struct km_event c; 1972 int err; 1973 int excl; 1974 1975 err = verify_newpolicy_info(p, extack); 1976 if (err) 1977 return err; 1978 err = verify_sec_ctx_len(attrs, extack); 1979 if (err) 1980 return err; 1981 1982 xp = xfrm_policy_construct(net, p, attrs, &err, extack); 1983 if (!xp) 1984 return err; 1985 1986 /* shouldn't excl be based on nlh flags?? 1987 * Aha! this is anti-netlink really i.e more pfkey derived 1988 * in netlink excl is a flag and you wouldn't need 1989 * a type XFRM_MSG_UPDPOLICY - JHS */ 1990 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY; 1991 err = xfrm_policy_insert(p->dir, xp, excl); 1992 xfrm_audit_policy_add(xp, err ? 0 : 1, true); 1993 1994 if (err) { 1995 xfrm_dev_policy_delete(xp); 1996 xfrm_dev_policy_free(xp); 1997 security_xfrm_policy_free(xp->security); 1998 kfree(xp); 1999 return err; 2000 } 2001 2002 c.event = nlh->nlmsg_type; 2003 c.seq = nlh->nlmsg_seq; 2004 c.portid = nlh->nlmsg_pid; 2005 km_policy_notify(xp, p->dir, &c); 2006 2007 xfrm_pol_put(xp); 2008 2009 return 0; 2010} 2011 2012static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb) 2013{ 2014 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH]; 2015 int i; 2016 2017 if (xp->xfrm_nr == 0) 2018 return 0; 2019 2020 for (i = 0; i < xp->xfrm_nr; i++) { 2021 struct xfrm_user_tmpl *up = &vec[i]; 2022 struct xfrm_tmpl *kp = &xp->xfrm_vec[i]; 2023 2024 memset(up, 0, sizeof(*up)); 2025 memcpy(&up->id, &kp->id, sizeof(up->id)); 2026 up->family = kp->encap_family; 2027 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr)); 2028 up->reqid = kp->reqid; 2029 up->mode = kp->mode; 2030 up->share = kp->share; 2031 up->optional = kp->optional; 2032 up->aalgos = kp->aalgos; 2033 up->ealgos = kp->ealgos; 2034 up->calgos = kp->calgos; 2035 } 2036 2037 return nla_put(skb, XFRMA_TMPL, 2038 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec); 2039} 2040 2041static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb) 2042{ 2043 if (x->security) { 2044 return copy_sec_ctx(x->security, skb); 2045 } 2046 return 0; 2047} 2048 2049static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb) 2050{ 2051 if (xp->security) 2052 return copy_sec_ctx(xp->security, skb); 2053 return 0; 2054} 2055static inline unsigned int userpolicy_type_attrsize(void) 2056{ 2057#ifdef CONFIG_XFRM_SUB_POLICY 2058 return nla_total_size(sizeof(struct xfrm_userpolicy_type)); 2059#else 2060 return 0; 2061#endif 2062} 2063 2064#ifdef CONFIG_XFRM_SUB_POLICY 2065static int copy_to_user_policy_type(u8 type, struct sk_buff *skb) 2066{ 2067 struct xfrm_userpolicy_type upt; 2068 2069 /* Sadly there are two holes in struct xfrm_userpolicy_type */ 2070 memset(&upt, 0, sizeof(upt)); 2071 upt.type = type; 2072 2073 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt); 2074} 2075 2076#else 2077static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb) 2078{ 2079 return 0; 2080} 2081#endif 2082 2083static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr) 2084{ 2085 struct xfrm_dump_info *sp = ptr; 2086 struct xfrm_userpolicy_info *p; 2087 struct sk_buff *in_skb = sp->in_skb; 2088 struct sk_buff *skb = sp->out_skb; 2089 struct xfrm_translator *xtr; 2090 struct nlmsghdr *nlh; 2091 int err; 2092 2093 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq, 2094 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags); 2095 if (nlh == NULL) 2096 return -EMSGSIZE; 2097 2098 p = nlmsg_data(nlh); 2099 copy_to_user_policy(xp, p, dir); 2100 err = copy_to_user_tmpl(xp, skb); 2101 if (!err) 2102 err = copy_to_user_sec_ctx(xp, skb); 2103 if (!err) 2104 err = copy_to_user_policy_type(xp->type, skb); 2105 if (!err) 2106 err = xfrm_mark_put(skb, &xp->mark); 2107 if (!err) 2108 err = xfrm_if_id_put(skb, xp->if_id); 2109 if (!err && xp->xdo.dev) 2110 err = copy_user_offload(&xp->xdo, skb); 2111 if (err) { 2112 nlmsg_cancel(skb, nlh); 2113 return err; 2114 } 2115 nlmsg_end(skb, nlh); 2116 2117 xtr = xfrm_get_translator(); 2118 if (xtr) { 2119 err = xtr->alloc_compat(skb, nlh); 2120 2121 xfrm_put_translator(xtr); 2122 if (err) { 2123 nlmsg_cancel(skb, nlh); 2124 return err; 2125 } 2126 } 2127 2128 return 0; 2129} 2130 2131static int xfrm_dump_policy_done(struct netlink_callback *cb) 2132{ 2133 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args; 2134 struct net *net = sock_net(cb->skb->sk); 2135 2136 xfrm_policy_walk_done(walk, net); 2137 return 0; 2138} 2139 2140static int xfrm_dump_policy_start(struct netlink_callback *cb) 2141{ 2142 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args; 2143 2144 BUILD_BUG_ON(sizeof(*walk) > sizeof(cb->args)); 2145 2146 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY); 2147 return 0; 2148} 2149 2150static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb) 2151{ 2152 struct net *net = sock_net(skb->sk); 2153 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args; 2154 struct xfrm_dump_info info; 2155 2156 info.in_skb = cb->skb; 2157 info.out_skb = skb; 2158 info.nlmsg_seq = cb->nlh->nlmsg_seq; 2159 info.nlmsg_flags = NLM_F_MULTI; 2160 2161 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info); 2162 2163 return skb->len; 2164} 2165 2166static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb, 2167 struct xfrm_policy *xp, 2168 int dir, u32 seq) 2169{ 2170 struct xfrm_dump_info info; 2171 struct sk_buff *skb; 2172 int err; 2173 2174 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 2175 if (!skb) 2176 return ERR_PTR(-ENOMEM); 2177 2178 info.in_skb = in_skb; 2179 info.out_skb = skb; 2180 info.nlmsg_seq = seq; 2181 info.nlmsg_flags = 0; 2182 2183 err = dump_one_policy(xp, dir, 0, &info); 2184 if (err) { 2185 kfree_skb(skb); 2186 return ERR_PTR(err); 2187 } 2188 2189 return skb; 2190} 2191 2192static int xfrm_notify_userpolicy(struct net *net) 2193{ 2194 struct xfrm_userpolicy_default *up; 2195 int len = NLMSG_ALIGN(sizeof(*up)); 2196 struct nlmsghdr *nlh; 2197 struct sk_buff *skb; 2198 int err; 2199 2200 skb = nlmsg_new(len, GFP_ATOMIC); 2201 if (skb == NULL) 2202 return -ENOMEM; 2203 2204 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_GETDEFAULT, sizeof(*up), 0); 2205 if (nlh == NULL) { 2206 kfree_skb(skb); 2207 return -EMSGSIZE; 2208 } 2209 2210 up = nlmsg_data(nlh); 2211 up->in = net->xfrm.policy_default[XFRM_POLICY_IN]; 2212 up->fwd = net->xfrm.policy_default[XFRM_POLICY_FWD]; 2213 up->out = net->xfrm.policy_default[XFRM_POLICY_OUT]; 2214 2215 nlmsg_end(skb, nlh); 2216 2217 rcu_read_lock(); 2218 err = xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY); 2219 rcu_read_unlock(); 2220 2221 return err; 2222} 2223 2224static bool xfrm_userpolicy_is_valid(__u8 policy) 2225{ 2226 return policy == XFRM_USERPOLICY_BLOCK || 2227 policy == XFRM_USERPOLICY_ACCEPT; 2228} 2229 2230static int xfrm_set_default(struct sk_buff *skb, struct nlmsghdr *nlh, 2231 struct nlattr **attrs, struct netlink_ext_ack *extack) 2232{ 2233 struct net *net = sock_net(skb->sk); 2234 struct xfrm_userpolicy_default *up = nlmsg_data(nlh); 2235 2236 if (xfrm_userpolicy_is_valid(up->in)) 2237 net->xfrm.policy_default[XFRM_POLICY_IN] = up->in; 2238 2239 if (xfrm_userpolicy_is_valid(up->fwd)) 2240 net->xfrm.policy_default[XFRM_POLICY_FWD] = up->fwd; 2241 2242 if (xfrm_userpolicy_is_valid(up->out)) 2243 net->xfrm.policy_default[XFRM_POLICY_OUT] = up->out; 2244 2245 rt_genid_bump_all(net); 2246 2247 xfrm_notify_userpolicy(net); 2248 return 0; 2249} 2250 2251static int xfrm_get_default(struct sk_buff *skb, struct nlmsghdr *nlh, 2252 struct nlattr **attrs, struct netlink_ext_ack *extack) 2253{ 2254 struct sk_buff *r_skb; 2255 struct nlmsghdr *r_nlh; 2256 struct net *net = sock_net(skb->sk); 2257 struct xfrm_userpolicy_default *r_up; 2258 int len = NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_default)); 2259 u32 portid = NETLINK_CB(skb).portid; 2260 u32 seq = nlh->nlmsg_seq; 2261 2262 r_skb = nlmsg_new(len, GFP_ATOMIC); 2263 if (!r_skb) 2264 return -ENOMEM; 2265 2266 r_nlh = nlmsg_put(r_skb, portid, seq, XFRM_MSG_GETDEFAULT, sizeof(*r_up), 0); 2267 if (!r_nlh) { 2268 kfree_skb(r_skb); 2269 return -EMSGSIZE; 2270 } 2271 2272 r_up = nlmsg_data(r_nlh); 2273 r_up->in = net->xfrm.policy_default[XFRM_POLICY_IN]; 2274 r_up->fwd = net->xfrm.policy_default[XFRM_POLICY_FWD]; 2275 r_up->out = net->xfrm.policy_default[XFRM_POLICY_OUT]; 2276 nlmsg_end(r_skb, r_nlh); 2277 2278 return nlmsg_unicast(net->xfrm.nlsk, r_skb, portid); 2279} 2280 2281static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 2282 struct nlattr **attrs, 2283 struct netlink_ext_ack *extack) 2284{ 2285 struct net *net = sock_net(skb->sk); 2286 struct xfrm_policy *xp; 2287 struct xfrm_userpolicy_id *p; 2288 u8 type = XFRM_POLICY_TYPE_MAIN; 2289 int err; 2290 struct km_event c; 2291 int delete; 2292 struct xfrm_mark m; 2293 u32 if_id = 0; 2294 2295 p = nlmsg_data(nlh); 2296 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY; 2297 2298 err = copy_from_user_policy_type(&type, attrs, extack); 2299 if (err) 2300 return err; 2301 2302 err = verify_policy_dir(p->dir, extack); 2303 if (err) 2304 return err; 2305 2306 if (attrs[XFRMA_IF_ID]) 2307 if_id = nla_get_u32(attrs[XFRMA_IF_ID]); 2308 2309 xfrm_mark_get(attrs, &m); 2310 2311 if (p->index) 2312 xp = xfrm_policy_byid(net, &m, if_id, type, p->dir, 2313 p->index, delete, &err); 2314 else { 2315 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 2316 struct xfrm_sec_ctx *ctx; 2317 2318 err = verify_sec_ctx_len(attrs, extack); 2319 if (err) 2320 return err; 2321 2322 ctx = NULL; 2323 if (rt) { 2324 struct xfrm_user_sec_ctx *uctx = nla_data(rt); 2325 2326 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL); 2327 if (err) 2328 return err; 2329 } 2330 xp = xfrm_policy_bysel_ctx(net, &m, if_id, type, p->dir, 2331 &p->sel, ctx, delete, &err); 2332 security_xfrm_policy_free(ctx); 2333 } 2334 if (xp == NULL) 2335 return -ENOENT; 2336 2337 if (!delete) { 2338 struct sk_buff *resp_skb; 2339 2340 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq); 2341 if (IS_ERR(resp_skb)) { 2342 err = PTR_ERR(resp_skb); 2343 } else { 2344 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, 2345 NETLINK_CB(skb).portid); 2346 } 2347 } else { 2348 xfrm_dev_policy_delete(xp); 2349 xfrm_audit_policy_delete(xp, err ? 0 : 1, true); 2350 2351 if (err != 0) 2352 goto out; 2353 2354 c.data.byid = p->index; 2355 c.event = nlh->nlmsg_type; 2356 c.seq = nlh->nlmsg_seq; 2357 c.portid = nlh->nlmsg_pid; 2358 km_policy_notify(xp, p->dir, &c); 2359 } 2360 2361out: 2362 xfrm_pol_put(xp); 2363 return err; 2364} 2365 2366static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 2367 struct nlattr **attrs, 2368 struct netlink_ext_ack *extack) 2369{ 2370 struct net *net = sock_net(skb->sk); 2371 struct km_event c; 2372 struct xfrm_usersa_flush *p = nlmsg_data(nlh); 2373 int err; 2374 2375 err = xfrm_state_flush(net, p->proto, true, false); 2376 if (err) { 2377 if (err == -ESRCH) /* empty table */ 2378 return 0; 2379 return err; 2380 } 2381 c.data.proto = p->proto; 2382 c.event = nlh->nlmsg_type; 2383 c.seq = nlh->nlmsg_seq; 2384 c.portid = nlh->nlmsg_pid; 2385 c.net = net; 2386 km_state_notify(NULL, &c); 2387 2388 return 0; 2389} 2390 2391static inline unsigned int xfrm_aevent_msgsize(struct xfrm_state *x) 2392{ 2393 unsigned int replay_size = x->replay_esn ? 2394 xfrm_replay_state_esn_len(x->replay_esn) : 2395 sizeof(struct xfrm_replay_state); 2396 2397 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id)) 2398 + nla_total_size(replay_size) 2399 + nla_total_size_64bit(sizeof(struct xfrm_lifetime_cur)) 2400 + nla_total_size(sizeof(struct xfrm_mark)) 2401 + nla_total_size(4) /* XFRM_AE_RTHR */ 2402 + nla_total_size(4); /* XFRM_AE_ETHR */ 2403} 2404 2405static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c) 2406{ 2407 struct xfrm_aevent_id *id; 2408 struct nlmsghdr *nlh; 2409 int err; 2410 2411 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0); 2412 if (nlh == NULL) 2413 return -EMSGSIZE; 2414 2415 id = nlmsg_data(nlh); 2416 memset(&id->sa_id, 0, sizeof(id->sa_id)); 2417 memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr)); 2418 id->sa_id.spi = x->id.spi; 2419 id->sa_id.family = x->props.family; 2420 id->sa_id.proto = x->id.proto; 2421 memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr)); 2422 id->reqid = x->props.reqid; 2423 id->flags = c->data.aevent; 2424 2425 if (x->replay_esn) { 2426 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL, 2427 xfrm_replay_state_esn_len(x->replay_esn), 2428 x->replay_esn); 2429 } else { 2430 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), 2431 &x->replay); 2432 } 2433 if (err) 2434 goto out_cancel; 2435 err = nla_put_64bit(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft, 2436 XFRMA_PAD); 2437 if (err) 2438 goto out_cancel; 2439 2440 if (id->flags & XFRM_AE_RTHR) { 2441 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff); 2442 if (err) 2443 goto out_cancel; 2444 } 2445 if (id->flags & XFRM_AE_ETHR) { 2446 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH, 2447 x->replay_maxage * 10 / HZ); 2448 if (err) 2449 goto out_cancel; 2450 } 2451 err = xfrm_mark_put(skb, &x->mark); 2452 if (err) 2453 goto out_cancel; 2454 2455 err = xfrm_if_id_put(skb, x->if_id); 2456 if (err) 2457 goto out_cancel; 2458 2459 nlmsg_end(skb, nlh); 2460 return 0; 2461 2462out_cancel: 2463 nlmsg_cancel(skb, nlh); 2464 return err; 2465} 2466 2467static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh, 2468 struct nlattr **attrs, struct netlink_ext_ack *extack) 2469{ 2470 struct net *net = sock_net(skb->sk); 2471 struct xfrm_state *x; 2472 struct sk_buff *r_skb; 2473 int err; 2474 struct km_event c; 2475 u32 mark; 2476 struct xfrm_mark m; 2477 struct xfrm_aevent_id *p = nlmsg_data(nlh); 2478 struct xfrm_usersa_id *id = &p->sa_id; 2479 2480 mark = xfrm_mark_get(attrs, &m); 2481 2482 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family); 2483 if (x == NULL) 2484 return -ESRCH; 2485 2486 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC); 2487 if (r_skb == NULL) { 2488 xfrm_state_put(x); 2489 return -ENOMEM; 2490 } 2491 2492 /* 2493 * XXX: is this lock really needed - none of the other 2494 * gets lock (the concern is things getting updated 2495 * while we are still reading) - jhs 2496 */ 2497 spin_lock_bh(&x->lock); 2498 c.data.aevent = p->flags; 2499 c.seq = nlh->nlmsg_seq; 2500 c.portid = nlh->nlmsg_pid; 2501 2502 err = build_aevent(r_skb, x, &c); 2503 BUG_ON(err < 0); 2504 2505 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid); 2506 spin_unlock_bh(&x->lock); 2507 xfrm_state_put(x); 2508 return err; 2509} 2510 2511static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh, 2512 struct nlattr **attrs, struct netlink_ext_ack *extack) 2513{ 2514 struct net *net = sock_net(skb->sk); 2515 struct xfrm_state *x; 2516 struct km_event c; 2517 int err = -EINVAL; 2518 u32 mark = 0; 2519 struct xfrm_mark m; 2520 struct xfrm_aevent_id *p = nlmsg_data(nlh); 2521 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL]; 2522 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL]; 2523 struct nlattr *lt = attrs[XFRMA_LTIME_VAL]; 2524 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH]; 2525 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH]; 2526 2527 if (!lt && !rp && !re && !et && !rt) { 2528 NL_SET_ERR_MSG(extack, "Missing required attribute for AE"); 2529 return err; 2530 } 2531 2532 /* pedantic mode - thou shalt sayeth replaceth */ 2533 if (!(nlh->nlmsg_flags & NLM_F_REPLACE)) { 2534 NL_SET_ERR_MSG(extack, "NLM_F_REPLACE flag is required"); 2535 return err; 2536 } 2537 2538 mark = xfrm_mark_get(attrs, &m); 2539 2540 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family); 2541 if (x == NULL) 2542 return -ESRCH; 2543 2544 if (x->km.state != XFRM_STATE_VALID) { 2545 NL_SET_ERR_MSG(extack, "SA must be in VALID state"); 2546 goto out; 2547 } 2548 2549 err = xfrm_replay_verify_len(x->replay_esn, re, extack); 2550 if (err) 2551 goto out; 2552 2553 spin_lock_bh(&x->lock); 2554 xfrm_update_ae_params(x, attrs, 1); 2555 spin_unlock_bh(&x->lock); 2556 2557 c.event = nlh->nlmsg_type; 2558 c.seq = nlh->nlmsg_seq; 2559 c.portid = nlh->nlmsg_pid; 2560 c.data.aevent = XFRM_AE_CU; 2561 km_state_notify(x, &c); 2562 err = 0; 2563out: 2564 xfrm_state_put(x); 2565 return err; 2566} 2567 2568static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 2569 struct nlattr **attrs, 2570 struct netlink_ext_ack *extack) 2571{ 2572 struct net *net = sock_net(skb->sk); 2573 struct km_event c; 2574 u8 type = XFRM_POLICY_TYPE_MAIN; 2575 int err; 2576 2577 err = copy_from_user_policy_type(&type, attrs, extack); 2578 if (err) 2579 return err; 2580 2581 err = xfrm_policy_flush(net, type, true); 2582 if (err) { 2583 if (err == -ESRCH) /* empty table */ 2584 return 0; 2585 return err; 2586 } 2587 2588 c.data.type = type; 2589 c.event = nlh->nlmsg_type; 2590 c.seq = nlh->nlmsg_seq; 2591 c.portid = nlh->nlmsg_pid; 2592 c.net = net; 2593 km_policy_notify(NULL, 0, &c); 2594 return 0; 2595} 2596 2597static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh, 2598 struct nlattr **attrs, 2599 struct netlink_ext_ack *extack) 2600{ 2601 struct net *net = sock_net(skb->sk); 2602 struct xfrm_policy *xp; 2603 struct xfrm_user_polexpire *up = nlmsg_data(nlh); 2604 struct xfrm_userpolicy_info *p = &up->pol; 2605 u8 type = XFRM_POLICY_TYPE_MAIN; 2606 int err = -ENOENT; 2607 struct xfrm_mark m; 2608 u32 if_id = 0; 2609 2610 err = copy_from_user_policy_type(&type, attrs, extack); 2611 if (err) 2612 return err; 2613 2614 err = verify_policy_dir(p->dir, extack); 2615 if (err) 2616 return err; 2617 2618 if (attrs[XFRMA_IF_ID]) 2619 if_id = nla_get_u32(attrs[XFRMA_IF_ID]); 2620 2621 xfrm_mark_get(attrs, &m); 2622 2623 if (p->index) 2624 xp = xfrm_policy_byid(net, &m, if_id, type, p->dir, p->index, 2625 0, &err); 2626 else { 2627 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 2628 struct xfrm_sec_ctx *ctx; 2629 2630 err = verify_sec_ctx_len(attrs, extack); 2631 if (err) 2632 return err; 2633 2634 ctx = NULL; 2635 if (rt) { 2636 struct xfrm_user_sec_ctx *uctx = nla_data(rt); 2637 2638 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL); 2639 if (err) 2640 return err; 2641 } 2642 xp = xfrm_policy_bysel_ctx(net, &m, if_id, type, p->dir, 2643 &p->sel, ctx, 0, &err); 2644 security_xfrm_policy_free(ctx); 2645 } 2646 if (xp == NULL) 2647 return -ENOENT; 2648 2649 if (unlikely(xp->walk.dead)) 2650 goto out; 2651 2652 err = 0; 2653 if (up->hard) { 2654 xfrm_policy_delete(xp, p->dir); 2655 xfrm_audit_policy_delete(xp, 1, true); 2656 } 2657 km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid); 2658 2659out: 2660 xfrm_pol_put(xp); 2661 return err; 2662} 2663 2664static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh, 2665 struct nlattr **attrs, 2666 struct netlink_ext_ack *extack) 2667{ 2668 struct net *net = sock_net(skb->sk); 2669 struct xfrm_state *x; 2670 int err; 2671 struct xfrm_user_expire *ue = nlmsg_data(nlh); 2672 struct xfrm_usersa_info *p = &ue->state; 2673 struct xfrm_mark m; 2674 u32 mark = xfrm_mark_get(attrs, &m); 2675 2676 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family); 2677 2678 err = -ENOENT; 2679 if (x == NULL) 2680 return err; 2681 2682 spin_lock_bh(&x->lock); 2683 err = -EINVAL; 2684 if (x->km.state != XFRM_STATE_VALID) { 2685 NL_SET_ERR_MSG(extack, "SA must be in VALID state"); 2686 goto out; 2687 } 2688 2689 km_state_expired(x, ue->hard, nlh->nlmsg_pid); 2690 2691 if (ue->hard) { 2692 __xfrm_state_delete(x); 2693 xfrm_audit_state_delete(x, 1, true); 2694 } 2695 err = 0; 2696out: 2697 spin_unlock_bh(&x->lock); 2698 xfrm_state_put(x); 2699 return err; 2700} 2701 2702static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh, 2703 struct nlattr **attrs, 2704 struct netlink_ext_ack *extack) 2705{ 2706 struct net *net = sock_net(skb->sk); 2707 struct xfrm_policy *xp; 2708 struct xfrm_user_tmpl *ut; 2709 int i; 2710 struct nlattr *rt = attrs[XFRMA_TMPL]; 2711 struct xfrm_mark mark; 2712 2713 struct xfrm_user_acquire *ua = nlmsg_data(nlh); 2714 struct xfrm_state *x = xfrm_state_alloc(net); 2715 int err = -ENOMEM; 2716 2717 if (!x) 2718 goto nomem; 2719 2720 xfrm_mark_get(attrs, &mark); 2721 2722 err = verify_newpolicy_info(&ua->policy, extack); 2723 if (err) 2724 goto free_state; 2725 err = verify_sec_ctx_len(attrs, extack); 2726 if (err) 2727 goto free_state; 2728 2729 /* build an XP */ 2730 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err, extack); 2731 if (!xp) 2732 goto free_state; 2733 2734 memcpy(&x->id, &ua->id, sizeof(ua->id)); 2735 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr)); 2736 memcpy(&x->sel, &ua->sel, sizeof(ua->sel)); 2737 xp->mark.m = x->mark.m = mark.m; 2738 xp->mark.v = x->mark.v = mark.v; 2739 ut = nla_data(rt); 2740 /* extract the templates and for each call km_key */ 2741 for (i = 0; i < xp->xfrm_nr; i++, ut++) { 2742 struct xfrm_tmpl *t = &xp->xfrm_vec[i]; 2743 memcpy(&x->id, &t->id, sizeof(x->id)); 2744 x->props.mode = t->mode; 2745 x->props.reqid = t->reqid; 2746 x->props.family = ut->family; 2747 t->aalgos = ua->aalgos; 2748 t->ealgos = ua->ealgos; 2749 t->calgos = ua->calgos; 2750 err = km_query(x, t, xp); 2751 2752 } 2753 2754 xfrm_state_free(x); 2755 kfree(xp); 2756 2757 return 0; 2758 2759free_state: 2760 xfrm_state_free(x); 2761nomem: 2762 return err; 2763} 2764 2765#ifdef CONFIG_XFRM_MIGRATE 2766static int copy_from_user_migrate(struct xfrm_migrate *ma, 2767 struct xfrm_kmaddress *k, 2768 struct nlattr **attrs, int *num, 2769 struct netlink_ext_ack *extack) 2770{ 2771 struct nlattr *rt = attrs[XFRMA_MIGRATE]; 2772 struct xfrm_user_migrate *um; 2773 int i, num_migrate; 2774 2775 if (k != NULL) { 2776 struct xfrm_user_kmaddress *uk; 2777 2778 uk = nla_data(attrs[XFRMA_KMADDRESS]); 2779 memcpy(&k->local, &uk->local, sizeof(k->local)); 2780 memcpy(&k->remote, &uk->remote, sizeof(k->remote)); 2781 k->family = uk->family; 2782 k->reserved = uk->reserved; 2783 } 2784 2785 um = nla_data(rt); 2786 num_migrate = nla_len(rt) / sizeof(*um); 2787 2788 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH) { 2789 NL_SET_ERR_MSG(extack, "Invalid number of SAs to migrate, must be 0 < num <= XFRM_MAX_DEPTH (6)"); 2790 return -EINVAL; 2791 } 2792 2793 for (i = 0; i < num_migrate; i++, um++, ma++) { 2794 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr)); 2795 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr)); 2796 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr)); 2797 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr)); 2798 2799 ma->proto = um->proto; 2800 ma->mode = um->mode; 2801 ma->reqid = um->reqid; 2802 2803 ma->old_family = um->old_family; 2804 ma->new_family = um->new_family; 2805 } 2806 2807 *num = i; 2808 return 0; 2809} 2810 2811static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh, 2812 struct nlattr **attrs, struct netlink_ext_ack *extack) 2813{ 2814 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh); 2815 struct xfrm_migrate m[XFRM_MAX_DEPTH]; 2816 struct xfrm_kmaddress km, *kmp; 2817 u8 type; 2818 int err; 2819 int n = 0; 2820 struct net *net = sock_net(skb->sk); 2821 struct xfrm_encap_tmpl *encap = NULL; 2822 u32 if_id = 0; 2823 2824 if (!attrs[XFRMA_MIGRATE]) { 2825 NL_SET_ERR_MSG(extack, "Missing required MIGRATE attribute"); 2826 return -EINVAL; 2827 } 2828 2829 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL; 2830 2831 err = copy_from_user_policy_type(&type, attrs, extack); 2832 if (err) 2833 return err; 2834 2835 err = copy_from_user_migrate(m, kmp, attrs, &n, extack); 2836 if (err) 2837 return err; 2838 2839 if (!n) 2840 return 0; 2841 2842 if (attrs[XFRMA_ENCAP]) { 2843 encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]), 2844 sizeof(*encap), GFP_KERNEL); 2845 if (!encap) 2846 return -ENOMEM; 2847 } 2848 2849 if (attrs[XFRMA_IF_ID]) 2850 if_id = nla_get_u32(attrs[XFRMA_IF_ID]); 2851 2852 err = xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net, encap, 2853 if_id, extack); 2854 2855 kfree(encap); 2856 2857 return err; 2858} 2859#else 2860static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh, 2861 struct nlattr **attrs, struct netlink_ext_ack *extack) 2862{ 2863 return -ENOPROTOOPT; 2864} 2865#endif 2866 2867#ifdef CONFIG_XFRM_MIGRATE 2868static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb) 2869{ 2870 struct xfrm_user_migrate um; 2871 2872 memset(&um, 0, sizeof(um)); 2873 um.proto = m->proto; 2874 um.mode = m->mode; 2875 um.reqid = m->reqid; 2876 um.old_family = m->old_family; 2877 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr)); 2878 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr)); 2879 um.new_family = m->new_family; 2880 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr)); 2881 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr)); 2882 2883 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um); 2884} 2885 2886static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb) 2887{ 2888 struct xfrm_user_kmaddress uk; 2889 2890 memset(&uk, 0, sizeof(uk)); 2891 uk.family = k->family; 2892 uk.reserved = k->reserved; 2893 memcpy(&uk.local, &k->local, sizeof(uk.local)); 2894 memcpy(&uk.remote, &k->remote, sizeof(uk.remote)); 2895 2896 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk); 2897} 2898 2899static inline unsigned int xfrm_migrate_msgsize(int num_migrate, int with_kma, 2900 int with_encp) 2901{ 2902 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id)) 2903 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0) 2904 + (with_encp ? nla_total_size(sizeof(struct xfrm_encap_tmpl)) : 0) 2905 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate) 2906 + userpolicy_type_attrsize(); 2907} 2908 2909static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m, 2910 int num_migrate, const struct xfrm_kmaddress *k, 2911 const struct xfrm_selector *sel, 2912 const struct xfrm_encap_tmpl *encap, u8 dir, u8 type) 2913{ 2914 const struct xfrm_migrate *mp; 2915 struct xfrm_userpolicy_id *pol_id; 2916 struct nlmsghdr *nlh; 2917 int i, err; 2918 2919 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0); 2920 if (nlh == NULL) 2921 return -EMSGSIZE; 2922 2923 pol_id = nlmsg_data(nlh); 2924 /* copy data from selector, dir, and type to the pol_id */ 2925 memset(pol_id, 0, sizeof(*pol_id)); 2926 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel)); 2927 pol_id->dir = dir; 2928 2929 if (k != NULL) { 2930 err = copy_to_user_kmaddress(k, skb); 2931 if (err) 2932 goto out_cancel; 2933 } 2934 if (encap) { 2935 err = nla_put(skb, XFRMA_ENCAP, sizeof(*encap), encap); 2936 if (err) 2937 goto out_cancel; 2938 } 2939 err = copy_to_user_policy_type(type, skb); 2940 if (err) 2941 goto out_cancel; 2942 for (i = 0, mp = m ; i < num_migrate; i++, mp++) { 2943 err = copy_to_user_migrate(mp, skb); 2944 if (err) 2945 goto out_cancel; 2946 } 2947 2948 nlmsg_end(skb, nlh); 2949 return 0; 2950 2951out_cancel: 2952 nlmsg_cancel(skb, nlh); 2953 return err; 2954} 2955 2956static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 2957 const struct xfrm_migrate *m, int num_migrate, 2958 const struct xfrm_kmaddress *k, 2959 const struct xfrm_encap_tmpl *encap) 2960{ 2961 struct net *net = &init_net; 2962 struct sk_buff *skb; 2963 int err; 2964 2965 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k, !!encap), 2966 GFP_ATOMIC); 2967 if (skb == NULL) 2968 return -ENOMEM; 2969 2970 /* build migrate */ 2971 err = build_migrate(skb, m, num_migrate, k, sel, encap, dir, type); 2972 BUG_ON(err < 0); 2973 2974 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE); 2975} 2976#else 2977static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 2978 const struct xfrm_migrate *m, int num_migrate, 2979 const struct xfrm_kmaddress *k, 2980 const struct xfrm_encap_tmpl *encap) 2981{ 2982 return -ENOPROTOOPT; 2983} 2984#endif 2985 2986#define XMSGSIZE(type) sizeof(struct type) 2987 2988const int xfrm_msg_min[XFRM_NR_MSGTYPES] = { 2989 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), 2990 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), 2991 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), 2992 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), 2993 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 2994 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 2995 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info), 2996 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire), 2997 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire), 2998 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), 2999 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), 3000 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire), 3001 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush), 3002 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0, 3003 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), 3004 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), 3005 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report), 3006 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 3007 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32), 3008 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = sizeof(u32), 3009 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32), 3010 [XFRM_MSG_SETDEFAULT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_default), 3011 [XFRM_MSG_GETDEFAULT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_default), 3012}; 3013EXPORT_SYMBOL_GPL(xfrm_msg_min); 3014 3015#undef XMSGSIZE 3016 3017const struct nla_policy xfrma_policy[XFRMA_MAX+1] = { 3018 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)}, 3019 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)}, 3020 [XFRMA_LASTUSED] = { .type = NLA_U64}, 3021 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)}, 3022 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) }, 3023 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) }, 3024 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) }, 3025 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) }, 3026 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) }, 3027 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) }, 3028 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_user_sec_ctx) }, 3029 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) }, 3030 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) }, 3031 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 }, 3032 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 }, 3033 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) }, 3034 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) }, 3035 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)}, 3036 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) }, 3037 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) }, 3038 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) }, 3039 [XFRMA_TFCPAD] = { .type = NLA_U32 }, 3040 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) }, 3041 [XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 }, 3042 [XFRMA_PROTO] = { .type = NLA_U8 }, 3043 [XFRMA_ADDRESS_FILTER] = { .len = sizeof(struct xfrm_address_filter) }, 3044 [XFRMA_OFFLOAD_DEV] = { .len = sizeof(struct xfrm_user_offload) }, 3045 [XFRMA_SET_MARK] = { .type = NLA_U32 }, 3046 [XFRMA_SET_MARK_MASK] = { .type = NLA_U32 }, 3047 [XFRMA_IF_ID] = { .type = NLA_U32 }, 3048 [XFRMA_MTIMER_THRESH] = { .type = NLA_U32 }, 3049}; 3050EXPORT_SYMBOL_GPL(xfrma_policy); 3051 3052static const struct nla_policy xfrma_spd_policy[XFRMA_SPD_MAX+1] = { 3053 [XFRMA_SPD_IPV4_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) }, 3054 [XFRMA_SPD_IPV6_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) }, 3055}; 3056 3057static const struct xfrm_link { 3058 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **, 3059 struct netlink_ext_ack *); 3060 int (*start)(struct netlink_callback *); 3061 int (*dump)(struct sk_buff *, struct netlink_callback *); 3062 int (*done)(struct netlink_callback *); 3063 const struct nla_policy *nla_pol; 3064 int nla_max; 3065} xfrm_dispatch[XFRM_NR_MSGTYPES] = { 3066 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, 3067 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa }, 3068 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa, 3069 .dump = xfrm_dump_sa, 3070 .done = xfrm_dump_sa_done }, 3071 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, 3072 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy }, 3073 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy, 3074 .start = xfrm_dump_policy_start, 3075 .dump = xfrm_dump_policy, 3076 .done = xfrm_dump_policy_done }, 3077 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi }, 3078 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire }, 3079 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire }, 3080 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, 3081 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, 3082 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire}, 3083 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa }, 3084 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy }, 3085 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae }, 3086 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae }, 3087 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate }, 3088 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo }, 3089 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_set_spdinfo, 3090 .nla_pol = xfrma_spd_policy, 3091 .nla_max = XFRMA_SPD_MAX }, 3092 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo }, 3093 [XFRM_MSG_SETDEFAULT - XFRM_MSG_BASE] = { .doit = xfrm_set_default }, 3094 [XFRM_MSG_GETDEFAULT - XFRM_MSG_BASE] = { .doit = xfrm_get_default }, 3095}; 3096 3097static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, 3098 struct netlink_ext_ack *extack) 3099{ 3100 struct net *net = sock_net(skb->sk); 3101 struct nlattr *attrs[XFRMA_MAX+1]; 3102 const struct xfrm_link *link; 3103 struct nlmsghdr *nlh64 = NULL; 3104 int type, err; 3105 3106 type = nlh->nlmsg_type; 3107 if (type > XFRM_MSG_MAX) 3108 return -EINVAL; 3109 3110 type -= XFRM_MSG_BASE; 3111 link = &xfrm_dispatch[type]; 3112 3113 /* All operations require privileges, even GET */ 3114 if (!netlink_net_capable(skb, CAP_NET_ADMIN)) 3115 return -EPERM; 3116 3117 if (in_compat_syscall()) { 3118 struct xfrm_translator *xtr = xfrm_get_translator(); 3119 3120 if (!xtr) 3121 return -EOPNOTSUPP; 3122 3123 nlh64 = xtr->rcv_msg_compat(nlh, link->nla_max, 3124 link->nla_pol, extack); 3125 xfrm_put_translator(xtr); 3126 if (IS_ERR(nlh64)) 3127 return PTR_ERR(nlh64); 3128 if (nlh64) 3129 nlh = nlh64; 3130 } 3131 3132 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) || 3133 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) && 3134 (nlh->nlmsg_flags & NLM_F_DUMP)) { 3135 struct netlink_dump_control c = { 3136 .start = link->start, 3137 .dump = link->dump, 3138 .done = link->done, 3139 }; 3140 3141 if (link->dump == NULL) { 3142 err = -EINVAL; 3143 goto err; 3144 } 3145 3146 err = netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c); 3147 goto err; 3148 } 3149 3150 err = nlmsg_parse_deprecated(nlh, xfrm_msg_min[type], attrs, 3151 link->nla_max ? : XFRMA_MAX, 3152 link->nla_pol ? : xfrma_policy, extack); 3153 if (err < 0) 3154 goto err; 3155 3156 if (link->doit == NULL) { 3157 err = -EINVAL; 3158 goto err; 3159 } 3160 3161 err = link->doit(skb, nlh, attrs, extack); 3162 3163 /* We need to free skb allocated in xfrm_alloc_compat() before 3164 * returning from this function, because consume_skb() won't take 3165 * care of frag_list since netlink destructor sets 3166 * sbk->head to NULL. (see netlink_skb_destructor()) 3167 */ 3168 if (skb_has_frag_list(skb)) { 3169 kfree_skb(skb_shinfo(skb)->frag_list); 3170 skb_shinfo(skb)->frag_list = NULL; 3171 } 3172 3173err: 3174 kvfree(nlh64); 3175 return err; 3176} 3177 3178static void xfrm_netlink_rcv(struct sk_buff *skb) 3179{ 3180 struct net *net = sock_net(skb->sk); 3181 3182 mutex_lock(&net->xfrm.xfrm_cfg_mutex); 3183 netlink_rcv_skb(skb, &xfrm_user_rcv_msg); 3184 mutex_unlock(&net->xfrm.xfrm_cfg_mutex); 3185} 3186 3187static inline unsigned int xfrm_expire_msgsize(void) 3188{ 3189 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire)) 3190 + nla_total_size(sizeof(struct xfrm_mark)); 3191} 3192 3193static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c) 3194{ 3195 struct xfrm_user_expire *ue; 3196 struct nlmsghdr *nlh; 3197 int err; 3198 3199 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0); 3200 if (nlh == NULL) 3201 return -EMSGSIZE; 3202 3203 ue = nlmsg_data(nlh); 3204 copy_to_user_state(x, &ue->state); 3205 ue->hard = (c->data.hard != 0) ? 1 : 0; 3206 /* clear the padding bytes */ 3207 memset_after(ue, 0, hard); 3208 3209 err = xfrm_mark_put(skb, &x->mark); 3210 if (err) 3211 return err; 3212 3213 err = xfrm_if_id_put(skb, x->if_id); 3214 if (err) 3215 return err; 3216 3217 nlmsg_end(skb, nlh); 3218 return 0; 3219} 3220 3221static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c) 3222{ 3223 struct net *net = xs_net(x); 3224 struct sk_buff *skb; 3225 3226 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC); 3227 if (skb == NULL) 3228 return -ENOMEM; 3229 3230 if (build_expire(skb, x, c) < 0) { 3231 kfree_skb(skb); 3232 return -EMSGSIZE; 3233 } 3234 3235 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE); 3236} 3237 3238static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c) 3239{ 3240 struct net *net = xs_net(x); 3241 struct sk_buff *skb; 3242 int err; 3243 3244 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC); 3245 if (skb == NULL) 3246 return -ENOMEM; 3247 3248 err = build_aevent(skb, x, c); 3249 BUG_ON(err < 0); 3250 3251 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS); 3252} 3253 3254static int xfrm_notify_sa_flush(const struct km_event *c) 3255{ 3256 struct net *net = c->net; 3257 struct xfrm_usersa_flush *p; 3258 struct nlmsghdr *nlh; 3259 struct sk_buff *skb; 3260 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush)); 3261 3262 skb = nlmsg_new(len, GFP_ATOMIC); 3263 if (skb == NULL) 3264 return -ENOMEM; 3265 3266 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0); 3267 if (nlh == NULL) { 3268 kfree_skb(skb); 3269 return -EMSGSIZE; 3270 } 3271 3272 p = nlmsg_data(nlh); 3273 p->proto = c->data.proto; 3274 3275 nlmsg_end(skb, nlh); 3276 3277 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA); 3278} 3279 3280static inline unsigned int xfrm_sa_len(struct xfrm_state *x) 3281{ 3282 unsigned int l = 0; 3283 if (x->aead) 3284 l += nla_total_size(aead_len(x->aead)); 3285 if (x->aalg) { 3286 l += nla_total_size(sizeof(struct xfrm_algo) + 3287 (x->aalg->alg_key_len + 7) / 8); 3288 l += nla_total_size(xfrm_alg_auth_len(x->aalg)); 3289 } 3290 if (x->ealg) 3291 l += nla_total_size(xfrm_alg_len(x->ealg)); 3292 if (x->calg) 3293 l += nla_total_size(sizeof(*x->calg)); 3294 if (x->encap) 3295 l += nla_total_size(sizeof(*x->encap)); 3296 if (x->tfcpad) 3297 l += nla_total_size(sizeof(x->tfcpad)); 3298 if (x->replay_esn) 3299 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn)); 3300 else 3301 l += nla_total_size(sizeof(struct xfrm_replay_state)); 3302 if (x->security) 3303 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) + 3304 x->security->ctx_len); 3305 if (x->coaddr) 3306 l += nla_total_size(sizeof(*x->coaddr)); 3307 if (x->props.extra_flags) 3308 l += nla_total_size(sizeof(x->props.extra_flags)); 3309 if (x->xso.dev) 3310 l += nla_total_size(sizeof(struct xfrm_user_offload)); 3311 if (x->props.smark.v | x->props.smark.m) { 3312 l += nla_total_size(sizeof(x->props.smark.v)); 3313 l += nla_total_size(sizeof(x->props.smark.m)); 3314 } 3315 if (x->if_id) 3316 l += nla_total_size(sizeof(x->if_id)); 3317 3318 /* Must count x->lastused as it may become non-zero behind our back. */ 3319 l += nla_total_size_64bit(sizeof(u64)); 3320 3321 if (x->mapping_maxage) 3322 l += nla_total_size(sizeof(x->mapping_maxage)); 3323 3324 return l; 3325} 3326 3327static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c) 3328{ 3329 struct net *net = xs_net(x); 3330 struct xfrm_usersa_info *p; 3331 struct xfrm_usersa_id *id; 3332 struct nlmsghdr *nlh; 3333 struct sk_buff *skb; 3334 unsigned int len = xfrm_sa_len(x); 3335 unsigned int headlen; 3336 int err; 3337 3338 headlen = sizeof(*p); 3339 if (c->event == XFRM_MSG_DELSA) { 3340 len += nla_total_size(headlen); 3341 headlen = sizeof(*id); 3342 len += nla_total_size(sizeof(struct xfrm_mark)); 3343 } 3344 len += NLMSG_ALIGN(headlen); 3345 3346 skb = nlmsg_new(len, GFP_ATOMIC); 3347 if (skb == NULL) 3348 return -ENOMEM; 3349 3350 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0); 3351 err = -EMSGSIZE; 3352 if (nlh == NULL) 3353 goto out_free_skb; 3354 3355 p = nlmsg_data(nlh); 3356 if (c->event == XFRM_MSG_DELSA) { 3357 struct nlattr *attr; 3358 3359 id = nlmsg_data(nlh); 3360 memset(id, 0, sizeof(*id)); 3361 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr)); 3362 id->spi = x->id.spi; 3363 id->family = x->props.family; 3364 id->proto = x->id.proto; 3365 3366 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p)); 3367 err = -EMSGSIZE; 3368 if (attr == NULL) 3369 goto out_free_skb; 3370 3371 p = nla_data(attr); 3372 } 3373 err = copy_to_user_state_extra(x, p, skb); 3374 if (err) 3375 goto out_free_skb; 3376 3377 nlmsg_end(skb, nlh); 3378 3379 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA); 3380 3381out_free_skb: 3382 kfree_skb(skb); 3383 return err; 3384} 3385 3386static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c) 3387{ 3388 3389 switch (c->event) { 3390 case XFRM_MSG_EXPIRE: 3391 return xfrm_exp_state_notify(x, c); 3392 case XFRM_MSG_NEWAE: 3393 return xfrm_aevent_state_notify(x, c); 3394 case XFRM_MSG_DELSA: 3395 case XFRM_MSG_UPDSA: 3396 case XFRM_MSG_NEWSA: 3397 return xfrm_notify_sa(x, c); 3398 case XFRM_MSG_FLUSHSA: 3399 return xfrm_notify_sa_flush(c); 3400 default: 3401 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n", 3402 c->event); 3403 break; 3404 } 3405 3406 return 0; 3407 3408} 3409 3410static inline unsigned int xfrm_acquire_msgsize(struct xfrm_state *x, 3411 struct xfrm_policy *xp) 3412{ 3413 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire)) 3414 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr) 3415 + nla_total_size(sizeof(struct xfrm_mark)) 3416 + nla_total_size(xfrm_user_sec_ctx_size(x->security)) 3417 + userpolicy_type_attrsize(); 3418} 3419 3420static int build_acquire(struct sk_buff *skb, struct xfrm_state *x, 3421 struct xfrm_tmpl *xt, struct xfrm_policy *xp) 3422{ 3423 __u32 seq = xfrm_get_acqseq(); 3424 struct xfrm_user_acquire *ua; 3425 struct nlmsghdr *nlh; 3426 int err; 3427 3428 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0); 3429 if (nlh == NULL) 3430 return -EMSGSIZE; 3431 3432 ua = nlmsg_data(nlh); 3433 memcpy(&ua->id, &x->id, sizeof(ua->id)); 3434 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr)); 3435 memcpy(&ua->sel, &x->sel, sizeof(ua->sel)); 3436 copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT); 3437 ua->aalgos = xt->aalgos; 3438 ua->ealgos = xt->ealgos; 3439 ua->calgos = xt->calgos; 3440 ua->seq = x->km.seq = seq; 3441 3442 err = copy_to_user_tmpl(xp, skb); 3443 if (!err) 3444 err = copy_to_user_state_sec_ctx(x, skb); 3445 if (!err) 3446 err = copy_to_user_policy_type(xp->type, skb); 3447 if (!err) 3448 err = xfrm_mark_put(skb, &xp->mark); 3449 if (!err) 3450 err = xfrm_if_id_put(skb, xp->if_id); 3451 if (!err && xp->xdo.dev) 3452 err = copy_user_offload(&xp->xdo, skb); 3453 if (err) { 3454 nlmsg_cancel(skb, nlh); 3455 return err; 3456 } 3457 3458 nlmsg_end(skb, nlh); 3459 return 0; 3460} 3461 3462static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt, 3463 struct xfrm_policy *xp) 3464{ 3465 struct net *net = xs_net(x); 3466 struct sk_buff *skb; 3467 int err; 3468 3469 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC); 3470 if (skb == NULL) 3471 return -ENOMEM; 3472 3473 err = build_acquire(skb, x, xt, xp); 3474 BUG_ON(err < 0); 3475 3476 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE); 3477} 3478 3479/* User gives us xfrm_user_policy_info followed by an array of 0 3480 * or more templates. 3481 */ 3482static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt, 3483 u8 *data, int len, int *dir) 3484{ 3485 struct net *net = sock_net(sk); 3486 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data; 3487 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1); 3488 struct xfrm_policy *xp; 3489 int nr; 3490 3491 switch (sk->sk_family) { 3492 case AF_INET: 3493 if (opt != IP_XFRM_POLICY) { 3494 *dir = -EOPNOTSUPP; 3495 return NULL; 3496 } 3497 break; 3498#if IS_ENABLED(CONFIG_IPV6) 3499 case AF_INET6: 3500 if (opt != IPV6_XFRM_POLICY) { 3501 *dir = -EOPNOTSUPP; 3502 return NULL; 3503 } 3504 break; 3505#endif 3506 default: 3507 *dir = -EINVAL; 3508 return NULL; 3509 } 3510 3511 *dir = -EINVAL; 3512 3513 if (len < sizeof(*p) || 3514 verify_newpolicy_info(p, NULL)) 3515 return NULL; 3516 3517 nr = ((len - sizeof(*p)) / sizeof(*ut)); 3518 if (validate_tmpl(nr, ut, p->sel.family, p->dir, NULL)) 3519 return NULL; 3520 3521 if (p->dir > XFRM_POLICY_OUT) 3522 return NULL; 3523 3524 xp = xfrm_policy_alloc(net, GFP_ATOMIC); 3525 if (xp == NULL) { 3526 *dir = -ENOBUFS; 3527 return NULL; 3528 } 3529 3530 copy_from_user_policy(xp, p); 3531 xp->type = XFRM_POLICY_TYPE_MAIN; 3532 copy_templates(xp, ut, nr); 3533 3534 *dir = p->dir; 3535 3536 return xp; 3537} 3538 3539static inline unsigned int xfrm_polexpire_msgsize(struct xfrm_policy *xp) 3540{ 3541 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire)) 3542 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr) 3543 + nla_total_size(xfrm_user_sec_ctx_size(xp->security)) 3544 + nla_total_size(sizeof(struct xfrm_mark)) 3545 + userpolicy_type_attrsize(); 3546} 3547 3548static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp, 3549 int dir, const struct km_event *c) 3550{ 3551 struct xfrm_user_polexpire *upe; 3552 int hard = c->data.hard; 3553 struct nlmsghdr *nlh; 3554 int err; 3555 3556 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0); 3557 if (nlh == NULL) 3558 return -EMSGSIZE; 3559 3560 upe = nlmsg_data(nlh); 3561 copy_to_user_policy(xp, &upe->pol, dir); 3562 err = copy_to_user_tmpl(xp, skb); 3563 if (!err) 3564 err = copy_to_user_sec_ctx(xp, skb); 3565 if (!err) 3566 err = copy_to_user_policy_type(xp->type, skb); 3567 if (!err) 3568 err = xfrm_mark_put(skb, &xp->mark); 3569 if (!err) 3570 err = xfrm_if_id_put(skb, xp->if_id); 3571 if (!err && xp->xdo.dev) 3572 err = copy_user_offload(&xp->xdo, skb); 3573 if (err) { 3574 nlmsg_cancel(skb, nlh); 3575 return err; 3576 } 3577 upe->hard = !!hard; 3578 3579 nlmsg_end(skb, nlh); 3580 return 0; 3581} 3582 3583static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 3584{ 3585 struct net *net = xp_net(xp); 3586 struct sk_buff *skb; 3587 int err; 3588 3589 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC); 3590 if (skb == NULL) 3591 return -ENOMEM; 3592 3593 err = build_polexpire(skb, xp, dir, c); 3594 BUG_ON(err < 0); 3595 3596 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE); 3597} 3598 3599static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c) 3600{ 3601 unsigned int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr); 3602 struct net *net = xp_net(xp); 3603 struct xfrm_userpolicy_info *p; 3604 struct xfrm_userpolicy_id *id; 3605 struct nlmsghdr *nlh; 3606 struct sk_buff *skb; 3607 unsigned int headlen; 3608 int err; 3609 3610 headlen = sizeof(*p); 3611 if (c->event == XFRM_MSG_DELPOLICY) { 3612 len += nla_total_size(headlen); 3613 headlen = sizeof(*id); 3614 } 3615 len += userpolicy_type_attrsize(); 3616 len += nla_total_size(sizeof(struct xfrm_mark)); 3617 len += NLMSG_ALIGN(headlen); 3618 3619 skb = nlmsg_new(len, GFP_ATOMIC); 3620 if (skb == NULL) 3621 return -ENOMEM; 3622 3623 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0); 3624 err = -EMSGSIZE; 3625 if (nlh == NULL) 3626 goto out_free_skb; 3627 3628 p = nlmsg_data(nlh); 3629 if (c->event == XFRM_MSG_DELPOLICY) { 3630 struct nlattr *attr; 3631 3632 id = nlmsg_data(nlh); 3633 memset(id, 0, sizeof(*id)); 3634 id->dir = dir; 3635 if (c->data.byid) 3636 id->index = xp->index; 3637 else 3638 memcpy(&id->sel, &xp->selector, sizeof(id->sel)); 3639 3640 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p)); 3641 err = -EMSGSIZE; 3642 if (attr == NULL) 3643 goto out_free_skb; 3644 3645 p = nla_data(attr); 3646 } 3647 3648 copy_to_user_policy(xp, p, dir); 3649 err = copy_to_user_tmpl(xp, skb); 3650 if (!err) 3651 err = copy_to_user_policy_type(xp->type, skb); 3652 if (!err) 3653 err = xfrm_mark_put(skb, &xp->mark); 3654 if (!err) 3655 err = xfrm_if_id_put(skb, xp->if_id); 3656 if (!err && xp->xdo.dev) 3657 err = copy_user_offload(&xp->xdo, skb); 3658 if (err) 3659 goto out_free_skb; 3660 3661 nlmsg_end(skb, nlh); 3662 3663 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY); 3664 3665out_free_skb: 3666 kfree_skb(skb); 3667 return err; 3668} 3669 3670static int xfrm_notify_policy_flush(const struct km_event *c) 3671{ 3672 struct net *net = c->net; 3673 struct nlmsghdr *nlh; 3674 struct sk_buff *skb; 3675 int err; 3676 3677 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC); 3678 if (skb == NULL) 3679 return -ENOMEM; 3680 3681 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0); 3682 err = -EMSGSIZE; 3683 if (nlh == NULL) 3684 goto out_free_skb; 3685 err = copy_to_user_policy_type(c->data.type, skb); 3686 if (err) 3687 goto out_free_skb; 3688 3689 nlmsg_end(skb, nlh); 3690 3691 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY); 3692 3693out_free_skb: 3694 kfree_skb(skb); 3695 return err; 3696} 3697 3698static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 3699{ 3700 3701 switch (c->event) { 3702 case XFRM_MSG_NEWPOLICY: 3703 case XFRM_MSG_UPDPOLICY: 3704 case XFRM_MSG_DELPOLICY: 3705 return xfrm_notify_policy(xp, dir, c); 3706 case XFRM_MSG_FLUSHPOLICY: 3707 return xfrm_notify_policy_flush(c); 3708 case XFRM_MSG_POLEXPIRE: 3709 return xfrm_exp_policy_notify(xp, dir, c); 3710 default: 3711 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n", 3712 c->event); 3713 } 3714 3715 return 0; 3716 3717} 3718 3719static inline unsigned int xfrm_report_msgsize(void) 3720{ 3721 return NLMSG_ALIGN(sizeof(struct xfrm_user_report)); 3722} 3723 3724static int build_report(struct sk_buff *skb, u8 proto, 3725 struct xfrm_selector *sel, xfrm_address_t *addr) 3726{ 3727 struct xfrm_user_report *ur; 3728 struct nlmsghdr *nlh; 3729 3730 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0); 3731 if (nlh == NULL) 3732 return -EMSGSIZE; 3733 3734 ur = nlmsg_data(nlh); 3735 ur->proto = proto; 3736 memcpy(&ur->sel, sel, sizeof(ur->sel)); 3737 3738 if (addr) { 3739 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr); 3740 if (err) { 3741 nlmsg_cancel(skb, nlh); 3742 return err; 3743 } 3744 } 3745 nlmsg_end(skb, nlh); 3746 return 0; 3747} 3748 3749static int xfrm_send_report(struct net *net, u8 proto, 3750 struct xfrm_selector *sel, xfrm_address_t *addr) 3751{ 3752 struct sk_buff *skb; 3753 int err; 3754 3755 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC); 3756 if (skb == NULL) 3757 return -ENOMEM; 3758 3759 err = build_report(skb, proto, sel, addr); 3760 BUG_ON(err < 0); 3761 3762 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT); 3763} 3764 3765static inline unsigned int xfrm_mapping_msgsize(void) 3766{ 3767 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping)); 3768} 3769 3770static int build_mapping(struct sk_buff *skb, struct xfrm_state *x, 3771 xfrm_address_t *new_saddr, __be16 new_sport) 3772{ 3773 struct xfrm_user_mapping *um; 3774 struct nlmsghdr *nlh; 3775 3776 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0); 3777 if (nlh == NULL) 3778 return -EMSGSIZE; 3779 3780 um = nlmsg_data(nlh); 3781 3782 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr)); 3783 um->id.spi = x->id.spi; 3784 um->id.family = x->props.family; 3785 um->id.proto = x->id.proto; 3786 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr)); 3787 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr)); 3788 um->new_sport = new_sport; 3789 um->old_sport = x->encap->encap_sport; 3790 um->reqid = x->props.reqid; 3791 3792 nlmsg_end(skb, nlh); 3793 return 0; 3794} 3795 3796static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, 3797 __be16 sport) 3798{ 3799 struct net *net = xs_net(x); 3800 struct sk_buff *skb; 3801 int err; 3802 3803 if (x->id.proto != IPPROTO_ESP) 3804 return -EINVAL; 3805 3806 if (!x->encap) 3807 return -EINVAL; 3808 3809 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC); 3810 if (skb == NULL) 3811 return -ENOMEM; 3812 3813 err = build_mapping(skb, x, ipaddr, sport); 3814 BUG_ON(err < 0); 3815 3816 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING); 3817} 3818 3819static bool xfrm_is_alive(const struct km_event *c) 3820{ 3821 return (bool)xfrm_acquire_is_on(c->net); 3822} 3823 3824static struct xfrm_mgr netlink_mgr = { 3825 .notify = xfrm_send_state_notify, 3826 .acquire = xfrm_send_acquire, 3827 .compile_policy = xfrm_compile_policy, 3828 .notify_policy = xfrm_send_policy_notify, 3829 .report = xfrm_send_report, 3830 .migrate = xfrm_send_migrate, 3831 .new_mapping = xfrm_send_mapping, 3832 .is_alive = xfrm_is_alive, 3833}; 3834 3835static int __net_init xfrm_user_net_init(struct net *net) 3836{ 3837 struct sock *nlsk; 3838 struct netlink_kernel_cfg cfg = { 3839 .groups = XFRMNLGRP_MAX, 3840 .input = xfrm_netlink_rcv, 3841 }; 3842 3843 nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg); 3844 if (nlsk == NULL) 3845 return -ENOMEM; 3846 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */ 3847 rcu_assign_pointer(net->xfrm.nlsk, nlsk); 3848 return 0; 3849} 3850 3851static void __net_exit xfrm_user_net_pre_exit(struct net *net) 3852{ 3853 RCU_INIT_POINTER(net->xfrm.nlsk, NULL); 3854} 3855 3856static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list) 3857{ 3858 struct net *net; 3859 3860 list_for_each_entry(net, net_exit_list, exit_list) 3861 netlink_kernel_release(net->xfrm.nlsk_stash); 3862} 3863 3864static struct pernet_operations xfrm_user_net_ops = { 3865 .init = xfrm_user_net_init, 3866 .pre_exit = xfrm_user_net_pre_exit, 3867 .exit_batch = xfrm_user_net_exit, 3868}; 3869 3870static int __init xfrm_user_init(void) 3871{ 3872 int rv; 3873 3874 printk(KERN_INFO "Initializing XFRM netlink socket\n"); 3875 3876 rv = register_pernet_subsys(&xfrm_user_net_ops); 3877 if (rv < 0) 3878 return rv; 3879 xfrm_register_km(&netlink_mgr); 3880 return 0; 3881} 3882 3883static void __exit xfrm_user_exit(void) 3884{ 3885 xfrm_unregister_km(&netlink_mgr); 3886 unregister_pernet_subsys(&xfrm_user_net_ops); 3887} 3888 3889module_init(xfrm_user_init); 3890module_exit(xfrm_user_exit); 3891MODULE_LICENSE("GPL"); 3892MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM); 3893