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 38 static 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 68 static 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 87 static 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 } 104 105 static 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 } 113 114 static 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 } 131 132 static 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 } 173 174 static 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 } 362 363 out: 364 return err; 365 } 366 367 static 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 } 394 395 static 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 } 422 423 static 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 } 454 455 static 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 } 488 489 static 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 } 516 517 static 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 } 554 555 static 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 } 587 588 static 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 } 598 599 static 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 */ 621 static 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) { 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 } 665 666 static 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 } 678 679 static 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; 773 774 error: 775 x->km.state = XFRM_STATE_DEAD; 776 xfrm_state_put(x); 777 error_no_put: 778 *errp = err; 779 return NULL; 780 } 781 782 static 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); 822 out: 823 xfrm_state_put(x); 824 return err; 825 } 826 827 static 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 } 860 861 static 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); 891 892 out: 893 xfrm_audit_state_delete(x, err ? 0 : 1, true); 894 xfrm_state_put(x); 895 return err; 896 } 897 898 static 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 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft)); 905 put_unaligned(x->stats.replay_window, &p->stats.replay_window); 906 put_unaligned(x->stats.replay, &p->stats.replay); 907 put_unaligned(x->stats.integrity_failed, &p->stats.integrity_failed); 908 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr)); 909 p->mode = x->props.mode; 910 p->replay_window = x->props.replay_window; 911 p->reqid = x->props.reqid; 912 p->family = x->props.family; 913 p->flags = x->props.flags; 914 p->seq = x->km.seq; 915 } 916 917 struct xfrm_dump_info { 918 struct sk_buff *in_skb; 919 struct sk_buff *out_skb; 920 u32 nlmsg_seq; 921 u16 nlmsg_flags; 922 }; 923 924 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb) 925 { 926 struct xfrm_user_sec_ctx *uctx; 927 struct nlattr *attr; 928 int ctx_size = sizeof(*uctx) + s->ctx_len; 929 930 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size); 931 if (attr == NULL) 932 return -EMSGSIZE; 933 934 uctx = nla_data(attr); 935 uctx->exttype = XFRMA_SEC_CTX; 936 uctx->len = ctx_size; 937 uctx->ctx_doi = s->ctx_doi; 938 uctx->ctx_alg = s->ctx_alg; 939 uctx->ctx_len = s->ctx_len; 940 memcpy(uctx + 1, s->ctx_str, s->ctx_len); 941 942 return 0; 943 } 944 945 static int copy_user_offload(struct xfrm_dev_offload *xso, struct sk_buff *skb) 946 { 947 struct xfrm_user_offload *xuo; 948 struct nlattr *attr; 949 950 attr = nla_reserve(skb, XFRMA_OFFLOAD_DEV, sizeof(*xuo)); 951 if (attr == NULL) 952 return -EMSGSIZE; 953 954 xuo = nla_data(attr); 955 memset(xuo, 0, sizeof(*xuo)); 956 xuo->ifindex = xso->dev->ifindex; 957 if (xso->dir == XFRM_DEV_OFFLOAD_IN) 958 xuo->flags = XFRM_OFFLOAD_INBOUND; 959 if (xso->type == XFRM_DEV_OFFLOAD_PACKET) 960 xuo->flags |= XFRM_OFFLOAD_PACKET; 961 962 return 0; 963 } 964 965 static bool xfrm_redact(void) 966 { 967 return IS_ENABLED(CONFIG_SECURITY) && 968 security_locked_down(LOCKDOWN_XFRM_SECRET); 969 } 970 971 static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb) 972 { 973 struct xfrm_algo *algo; 974 struct xfrm_algo_auth *ap; 975 struct nlattr *nla; 976 bool redact_secret = xfrm_redact(); 977 978 nla = nla_reserve(skb, XFRMA_ALG_AUTH, 979 sizeof(*algo) + (auth->alg_key_len + 7) / 8); 980 if (!nla) 981 return -EMSGSIZE; 982 algo = nla_data(nla); 983 strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name)); 984 985 if (redact_secret && auth->alg_key_len) 986 memset(algo->alg_key, 0, (auth->alg_key_len + 7) / 8); 987 else 988 memcpy(algo->alg_key, auth->alg_key, 989 (auth->alg_key_len + 7) / 8); 990 algo->alg_key_len = auth->alg_key_len; 991 992 nla = nla_reserve(skb, XFRMA_ALG_AUTH_TRUNC, xfrm_alg_auth_len(auth)); 993 if (!nla) 994 return -EMSGSIZE; 995 ap = nla_data(nla); 996 memcpy(ap, auth, sizeof(struct xfrm_algo_auth)); 997 if (redact_secret && auth->alg_key_len) 998 memset(ap->alg_key, 0, (auth->alg_key_len + 7) / 8); 999 else 1000 memcpy(ap->alg_key, auth->alg_key, 1001 (auth->alg_key_len + 7) / 8); 1002 return 0; 1003 } 1004 1005 static int copy_to_user_aead(struct xfrm_algo_aead *aead, struct sk_buff *skb) 1006 { 1007 struct nlattr *nla = nla_reserve(skb, XFRMA_ALG_AEAD, aead_len(aead)); 1008 struct xfrm_algo_aead *ap; 1009 bool redact_secret = xfrm_redact(); 1010 1011 if (!nla) 1012 return -EMSGSIZE; 1013 1014 ap = nla_data(nla); 1015 memcpy(ap, aead, sizeof(*aead)); 1016 1017 if (redact_secret && aead->alg_key_len) 1018 memset(ap->alg_key, 0, (aead->alg_key_len + 7) / 8); 1019 else 1020 memcpy(ap->alg_key, aead->alg_key, 1021 (aead->alg_key_len + 7) / 8); 1022 return 0; 1023 } 1024 1025 static int copy_to_user_ealg(struct xfrm_algo *ealg, struct sk_buff *skb) 1026 { 1027 struct xfrm_algo *ap; 1028 bool redact_secret = xfrm_redact(); 1029 struct nlattr *nla = nla_reserve(skb, XFRMA_ALG_CRYPT, 1030 xfrm_alg_len(ealg)); 1031 if (!nla) 1032 return -EMSGSIZE; 1033 1034 ap = nla_data(nla); 1035 memcpy(ap, ealg, sizeof(*ealg)); 1036 1037 if (redact_secret && ealg->alg_key_len) 1038 memset(ap->alg_key, 0, (ealg->alg_key_len + 7) / 8); 1039 else 1040 memcpy(ap->alg_key, ealg->alg_key, 1041 (ealg->alg_key_len + 7) / 8); 1042 1043 return 0; 1044 } 1045 1046 static int xfrm_smark_put(struct sk_buff *skb, struct xfrm_mark *m) 1047 { 1048 int ret = 0; 1049 1050 if (m->v | m->m) { 1051 ret = nla_put_u32(skb, XFRMA_SET_MARK, m->v); 1052 if (!ret) 1053 ret = nla_put_u32(skb, XFRMA_SET_MARK_MASK, m->m); 1054 } 1055 return ret; 1056 } 1057 1058 /* Don't change this without updating xfrm_sa_len! */ 1059 static int copy_to_user_state_extra(struct xfrm_state *x, 1060 struct xfrm_usersa_info *p, 1061 struct sk_buff *skb) 1062 { 1063 int ret = 0; 1064 1065 copy_to_user_state(x, p); 1066 1067 if (x->props.extra_flags) { 1068 ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS, 1069 x->props.extra_flags); 1070 if (ret) 1071 goto out; 1072 } 1073 1074 if (x->coaddr) { 1075 ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr); 1076 if (ret) 1077 goto out; 1078 } 1079 if (x->lastused) { 1080 ret = nla_put_u64_64bit(skb, XFRMA_LASTUSED, x->lastused, 1081 XFRMA_PAD); 1082 if (ret) 1083 goto out; 1084 } 1085 if (x->aead) { 1086 ret = copy_to_user_aead(x->aead, skb); 1087 if (ret) 1088 goto out; 1089 } 1090 if (x->aalg) { 1091 ret = copy_to_user_auth(x->aalg, skb); 1092 if (ret) 1093 goto out; 1094 } 1095 if (x->ealg) { 1096 ret = copy_to_user_ealg(x->ealg, skb); 1097 if (ret) 1098 goto out; 1099 } 1100 if (x->calg) { 1101 ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg); 1102 if (ret) 1103 goto out; 1104 } 1105 if (x->encap) { 1106 ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap); 1107 if (ret) 1108 goto out; 1109 } 1110 if (x->tfcpad) { 1111 ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad); 1112 if (ret) 1113 goto out; 1114 } 1115 ret = xfrm_mark_put(skb, &x->mark); 1116 if (ret) 1117 goto out; 1118 1119 ret = xfrm_smark_put(skb, &x->props.smark); 1120 if (ret) 1121 goto out; 1122 1123 if (x->replay_esn) 1124 ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL, 1125 xfrm_replay_state_esn_len(x->replay_esn), 1126 x->replay_esn); 1127 else 1128 ret = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), 1129 &x->replay); 1130 if (ret) 1131 goto out; 1132 if(x->xso.dev) 1133 ret = copy_user_offload(&x->xso, skb); 1134 if (ret) 1135 goto out; 1136 if (x->if_id) { 1137 ret = nla_put_u32(skb, XFRMA_IF_ID, x->if_id); 1138 if (ret) 1139 goto out; 1140 } 1141 if (x->security) { 1142 ret = copy_sec_ctx(x->security, skb); 1143 if (ret) 1144 goto out; 1145 } 1146 if (x->mapping_maxage) 1147 ret = nla_put_u32(skb, XFRMA_MTIMER_THRESH, x->mapping_maxage); 1148 out: 1149 return ret; 1150 } 1151 1152 static int dump_one_state(struct xfrm_state *x, int count, void *ptr) 1153 { 1154 struct xfrm_dump_info *sp = ptr; 1155 struct sk_buff *in_skb = sp->in_skb; 1156 struct sk_buff *skb = sp->out_skb; 1157 struct xfrm_translator *xtr; 1158 struct xfrm_usersa_info *p; 1159 struct nlmsghdr *nlh; 1160 int err; 1161 1162 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq, 1163 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags); 1164 if (nlh == NULL) 1165 return -EMSGSIZE; 1166 1167 p = nlmsg_data(nlh); 1168 1169 err = copy_to_user_state_extra(x, p, skb); 1170 if (err) { 1171 nlmsg_cancel(skb, nlh); 1172 return err; 1173 } 1174 nlmsg_end(skb, nlh); 1175 1176 xtr = xfrm_get_translator(); 1177 if (xtr) { 1178 err = xtr->alloc_compat(skb, nlh); 1179 1180 xfrm_put_translator(xtr); 1181 if (err) { 1182 nlmsg_cancel(skb, nlh); 1183 return err; 1184 } 1185 } 1186 1187 return 0; 1188 } 1189 1190 static int xfrm_dump_sa_done(struct netlink_callback *cb) 1191 { 1192 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1]; 1193 struct sock *sk = cb->skb->sk; 1194 struct net *net = sock_net(sk); 1195 1196 if (cb->args[0]) 1197 xfrm_state_walk_done(walk, net); 1198 return 0; 1199 } 1200 1201 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb) 1202 { 1203 struct net *net = sock_net(skb->sk); 1204 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1]; 1205 struct xfrm_dump_info info; 1206 1207 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) > 1208 sizeof(cb->args) - sizeof(cb->args[0])); 1209 1210 info.in_skb = cb->skb; 1211 info.out_skb = skb; 1212 info.nlmsg_seq = cb->nlh->nlmsg_seq; 1213 info.nlmsg_flags = NLM_F_MULTI; 1214 1215 if (!cb->args[0]) { 1216 struct nlattr *attrs[XFRMA_MAX+1]; 1217 struct xfrm_address_filter *filter = NULL; 1218 u8 proto = 0; 1219 int err; 1220 1221 err = nlmsg_parse_deprecated(cb->nlh, 0, attrs, XFRMA_MAX, 1222 xfrma_policy, cb->extack); 1223 if (err < 0) 1224 return err; 1225 1226 if (attrs[XFRMA_ADDRESS_FILTER]) { 1227 filter = kmemdup(nla_data(attrs[XFRMA_ADDRESS_FILTER]), 1228 sizeof(*filter), GFP_KERNEL); 1229 if (filter == NULL) 1230 return -ENOMEM; 1231 } 1232 1233 if (attrs[XFRMA_PROTO]) 1234 proto = nla_get_u8(attrs[XFRMA_PROTO]); 1235 1236 xfrm_state_walk_init(walk, proto, filter); 1237 cb->args[0] = 1; 1238 } 1239 1240 (void) xfrm_state_walk(net, walk, dump_one_state, &info); 1241 1242 return skb->len; 1243 } 1244 1245 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb, 1246 struct xfrm_state *x, u32 seq) 1247 { 1248 struct xfrm_dump_info info; 1249 struct sk_buff *skb; 1250 int err; 1251 1252 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 1253 if (!skb) 1254 return ERR_PTR(-ENOMEM); 1255 1256 info.in_skb = in_skb; 1257 info.out_skb = skb; 1258 info.nlmsg_seq = seq; 1259 info.nlmsg_flags = 0; 1260 1261 err = dump_one_state(x, 0, &info); 1262 if (err) { 1263 kfree_skb(skb); 1264 return ERR_PTR(err); 1265 } 1266 1267 return skb; 1268 } 1269 1270 /* A wrapper for nlmsg_multicast() checking that nlsk is still available. 1271 * Must be called with RCU read lock. 1272 */ 1273 static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb, 1274 u32 pid, unsigned int group) 1275 { 1276 struct sock *nlsk = rcu_dereference(net->xfrm.nlsk); 1277 struct xfrm_translator *xtr; 1278 1279 if (!nlsk) { 1280 kfree_skb(skb); 1281 return -EPIPE; 1282 } 1283 1284 xtr = xfrm_get_translator(); 1285 if (xtr) { 1286 int err = xtr->alloc_compat(skb, nlmsg_hdr(skb)); 1287 1288 xfrm_put_translator(xtr); 1289 if (err) { 1290 kfree_skb(skb); 1291 return err; 1292 } 1293 } 1294 1295 return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC); 1296 } 1297 1298 static inline unsigned int xfrm_spdinfo_msgsize(void) 1299 { 1300 return NLMSG_ALIGN(4) 1301 + nla_total_size(sizeof(struct xfrmu_spdinfo)) 1302 + nla_total_size(sizeof(struct xfrmu_spdhinfo)) 1303 + nla_total_size(sizeof(struct xfrmu_spdhthresh)) 1304 + nla_total_size(sizeof(struct xfrmu_spdhthresh)); 1305 } 1306 1307 static int build_spdinfo(struct sk_buff *skb, struct net *net, 1308 u32 portid, u32 seq, u32 flags) 1309 { 1310 struct xfrmk_spdinfo si; 1311 struct xfrmu_spdinfo spc; 1312 struct xfrmu_spdhinfo sph; 1313 struct xfrmu_spdhthresh spt4, spt6; 1314 struct nlmsghdr *nlh; 1315 int err; 1316 u32 *f; 1317 unsigned lseq; 1318 1319 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0); 1320 if (nlh == NULL) /* shouldn't really happen ... */ 1321 return -EMSGSIZE; 1322 1323 f = nlmsg_data(nlh); 1324 *f = flags; 1325 xfrm_spd_getinfo(net, &si); 1326 spc.incnt = si.incnt; 1327 spc.outcnt = si.outcnt; 1328 spc.fwdcnt = si.fwdcnt; 1329 spc.inscnt = si.inscnt; 1330 spc.outscnt = si.outscnt; 1331 spc.fwdscnt = si.fwdscnt; 1332 sph.spdhcnt = si.spdhcnt; 1333 sph.spdhmcnt = si.spdhmcnt; 1334 1335 do { 1336 lseq = read_seqbegin(&net->xfrm.policy_hthresh.lock); 1337 1338 spt4.lbits = net->xfrm.policy_hthresh.lbits4; 1339 spt4.rbits = net->xfrm.policy_hthresh.rbits4; 1340 spt6.lbits = net->xfrm.policy_hthresh.lbits6; 1341 spt6.rbits = net->xfrm.policy_hthresh.rbits6; 1342 } while (read_seqretry(&net->xfrm.policy_hthresh.lock, lseq)); 1343 1344 err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc); 1345 if (!err) 1346 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph); 1347 if (!err) 1348 err = nla_put(skb, XFRMA_SPD_IPV4_HTHRESH, sizeof(spt4), &spt4); 1349 if (!err) 1350 err = nla_put(skb, XFRMA_SPD_IPV6_HTHRESH, sizeof(spt6), &spt6); 1351 if (err) { 1352 nlmsg_cancel(skb, nlh); 1353 return err; 1354 } 1355 1356 nlmsg_end(skb, nlh); 1357 return 0; 1358 } 1359 1360 static int xfrm_set_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh, 1361 struct nlattr **attrs, 1362 struct netlink_ext_ack *extack) 1363 { 1364 struct net *net = sock_net(skb->sk); 1365 struct xfrmu_spdhthresh *thresh4 = NULL; 1366 struct xfrmu_spdhthresh *thresh6 = NULL; 1367 1368 /* selector prefixlen thresholds to hash policies */ 1369 if (attrs[XFRMA_SPD_IPV4_HTHRESH]) { 1370 struct nlattr *rta = attrs[XFRMA_SPD_IPV4_HTHRESH]; 1371 1372 if (nla_len(rta) < sizeof(*thresh4)) { 1373 NL_SET_ERR_MSG(extack, "Invalid SPD_IPV4_HTHRESH attribute length"); 1374 return -EINVAL; 1375 } 1376 thresh4 = nla_data(rta); 1377 if (thresh4->lbits > 32 || thresh4->rbits > 32) { 1378 NL_SET_ERR_MSG(extack, "Invalid hash threshold (must be <= 32 for IPv4)"); 1379 return -EINVAL; 1380 } 1381 } 1382 if (attrs[XFRMA_SPD_IPV6_HTHRESH]) { 1383 struct nlattr *rta = attrs[XFRMA_SPD_IPV6_HTHRESH]; 1384 1385 if (nla_len(rta) < sizeof(*thresh6)) { 1386 NL_SET_ERR_MSG(extack, "Invalid SPD_IPV6_HTHRESH attribute length"); 1387 return -EINVAL; 1388 } 1389 thresh6 = nla_data(rta); 1390 if (thresh6->lbits > 128 || thresh6->rbits > 128) { 1391 NL_SET_ERR_MSG(extack, "Invalid hash threshold (must be <= 128 for IPv6)"); 1392 return -EINVAL; 1393 } 1394 } 1395 1396 if (thresh4 || thresh6) { 1397 write_seqlock(&net->xfrm.policy_hthresh.lock); 1398 if (thresh4) { 1399 net->xfrm.policy_hthresh.lbits4 = thresh4->lbits; 1400 net->xfrm.policy_hthresh.rbits4 = thresh4->rbits; 1401 } 1402 if (thresh6) { 1403 net->xfrm.policy_hthresh.lbits6 = thresh6->lbits; 1404 net->xfrm.policy_hthresh.rbits6 = thresh6->rbits; 1405 } 1406 write_sequnlock(&net->xfrm.policy_hthresh.lock); 1407 1408 xfrm_policy_hash_rebuild(net); 1409 } 1410 1411 return 0; 1412 } 1413 1414 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh, 1415 struct nlattr **attrs, 1416 struct netlink_ext_ack *extack) 1417 { 1418 struct net *net = sock_net(skb->sk); 1419 struct sk_buff *r_skb; 1420 u32 *flags = nlmsg_data(nlh); 1421 u32 sportid = NETLINK_CB(skb).portid; 1422 u32 seq = nlh->nlmsg_seq; 1423 int err; 1424 1425 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC); 1426 if (r_skb == NULL) 1427 return -ENOMEM; 1428 1429 err = build_spdinfo(r_skb, net, sportid, seq, *flags); 1430 BUG_ON(err < 0); 1431 1432 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid); 1433 } 1434 1435 static inline unsigned int xfrm_sadinfo_msgsize(void) 1436 { 1437 return NLMSG_ALIGN(4) 1438 + nla_total_size(sizeof(struct xfrmu_sadhinfo)) 1439 + nla_total_size(4); /* XFRMA_SAD_CNT */ 1440 } 1441 1442 static int build_sadinfo(struct sk_buff *skb, struct net *net, 1443 u32 portid, u32 seq, u32 flags) 1444 { 1445 struct xfrmk_sadinfo si; 1446 struct xfrmu_sadhinfo sh; 1447 struct nlmsghdr *nlh; 1448 int err; 1449 u32 *f; 1450 1451 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0); 1452 if (nlh == NULL) /* shouldn't really happen ... */ 1453 return -EMSGSIZE; 1454 1455 f = nlmsg_data(nlh); 1456 *f = flags; 1457 xfrm_sad_getinfo(net, &si); 1458 1459 sh.sadhmcnt = si.sadhmcnt; 1460 sh.sadhcnt = si.sadhcnt; 1461 1462 err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt); 1463 if (!err) 1464 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh); 1465 if (err) { 1466 nlmsg_cancel(skb, nlh); 1467 return err; 1468 } 1469 1470 nlmsg_end(skb, nlh); 1471 return 0; 1472 } 1473 1474 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh, 1475 struct nlattr **attrs, 1476 struct netlink_ext_ack *extack) 1477 { 1478 struct net *net = sock_net(skb->sk); 1479 struct sk_buff *r_skb; 1480 u32 *flags = nlmsg_data(nlh); 1481 u32 sportid = NETLINK_CB(skb).portid; 1482 u32 seq = nlh->nlmsg_seq; 1483 int err; 1484 1485 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC); 1486 if (r_skb == NULL) 1487 return -ENOMEM; 1488 1489 err = build_sadinfo(r_skb, net, sportid, seq, *flags); 1490 BUG_ON(err < 0); 1491 1492 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid); 1493 } 1494 1495 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 1496 struct nlattr **attrs, struct netlink_ext_ack *extack) 1497 { 1498 struct net *net = sock_net(skb->sk); 1499 struct xfrm_usersa_id *p = nlmsg_data(nlh); 1500 struct xfrm_state *x; 1501 struct sk_buff *resp_skb; 1502 int err = -ESRCH; 1503 1504 x = xfrm_user_state_lookup(net, p, attrs, &err); 1505 if (x == NULL) 1506 goto out_noput; 1507 1508 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); 1509 if (IS_ERR(resp_skb)) { 1510 err = PTR_ERR(resp_skb); 1511 } else { 1512 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid); 1513 } 1514 xfrm_state_put(x); 1515 out_noput: 1516 return err; 1517 } 1518 1519 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh, 1520 struct nlattr **attrs, 1521 struct netlink_ext_ack *extack) 1522 { 1523 struct net *net = sock_net(skb->sk); 1524 struct xfrm_state *x; 1525 struct xfrm_userspi_info *p; 1526 struct xfrm_translator *xtr; 1527 struct sk_buff *resp_skb; 1528 xfrm_address_t *daddr; 1529 int family; 1530 int err; 1531 u32 mark; 1532 struct xfrm_mark m; 1533 u32 if_id = 0; 1534 1535 p = nlmsg_data(nlh); 1536 err = verify_spi_info(p->info.id.proto, p->min, p->max, extack); 1537 if (err) 1538 goto out_noput; 1539 1540 family = p->info.family; 1541 daddr = &p->info.id.daddr; 1542 1543 x = NULL; 1544 1545 mark = xfrm_mark_get(attrs, &m); 1546 1547 if (attrs[XFRMA_IF_ID]) 1548 if_id = nla_get_u32(attrs[XFRMA_IF_ID]); 1549 1550 if (p->info.seq) { 1551 x = xfrm_find_acq_byseq(net, mark, p->info.seq); 1552 if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) { 1553 xfrm_state_put(x); 1554 x = NULL; 1555 } 1556 } 1557 1558 if (!x) 1559 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid, 1560 if_id, p->info.id.proto, daddr, 1561 &p->info.saddr, 1, 1562 family); 1563 err = -ENOENT; 1564 if (!x) { 1565 NL_SET_ERR_MSG(extack, "Target ACQUIRE not found"); 1566 goto out_noput; 1567 } 1568 1569 err = xfrm_alloc_spi(x, p->min, p->max, extack); 1570 if (err) 1571 goto out; 1572 1573 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); 1574 if (IS_ERR(resp_skb)) { 1575 err = PTR_ERR(resp_skb); 1576 goto out; 1577 } 1578 1579 xtr = xfrm_get_translator(); 1580 if (xtr) { 1581 err = xtr->alloc_compat(skb, nlmsg_hdr(skb)); 1582 1583 xfrm_put_translator(xtr); 1584 if (err) { 1585 kfree_skb(resp_skb); 1586 goto out; 1587 } 1588 } 1589 1590 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid); 1591 1592 out: 1593 xfrm_state_put(x); 1594 out_noput: 1595 return err; 1596 } 1597 1598 static int verify_policy_dir(u8 dir, struct netlink_ext_ack *extack) 1599 { 1600 switch (dir) { 1601 case XFRM_POLICY_IN: 1602 case XFRM_POLICY_OUT: 1603 case XFRM_POLICY_FWD: 1604 break; 1605 1606 default: 1607 NL_SET_ERR_MSG(extack, "Invalid policy direction"); 1608 return -EINVAL; 1609 } 1610 1611 return 0; 1612 } 1613 1614 static int verify_policy_type(u8 type, struct netlink_ext_ack *extack) 1615 { 1616 switch (type) { 1617 case XFRM_POLICY_TYPE_MAIN: 1618 #ifdef CONFIG_XFRM_SUB_POLICY 1619 case XFRM_POLICY_TYPE_SUB: 1620 #endif 1621 break; 1622 1623 default: 1624 NL_SET_ERR_MSG(extack, "Invalid policy type"); 1625 return -EINVAL; 1626 } 1627 1628 return 0; 1629 } 1630 1631 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p, 1632 struct netlink_ext_ack *extack) 1633 { 1634 int ret; 1635 1636 switch (p->share) { 1637 case XFRM_SHARE_ANY: 1638 case XFRM_SHARE_SESSION: 1639 case XFRM_SHARE_USER: 1640 case XFRM_SHARE_UNIQUE: 1641 break; 1642 1643 default: 1644 NL_SET_ERR_MSG(extack, "Invalid policy share"); 1645 return -EINVAL; 1646 } 1647 1648 switch (p->action) { 1649 case XFRM_POLICY_ALLOW: 1650 case XFRM_POLICY_BLOCK: 1651 break; 1652 1653 default: 1654 NL_SET_ERR_MSG(extack, "Invalid policy action"); 1655 return -EINVAL; 1656 } 1657 1658 switch (p->sel.family) { 1659 case AF_INET: 1660 if (p->sel.prefixlen_d > 32 || p->sel.prefixlen_s > 32) { 1661 NL_SET_ERR_MSG(extack, "Invalid prefix length in selector (must be <= 32 for IPv4)"); 1662 return -EINVAL; 1663 } 1664 1665 break; 1666 1667 case AF_INET6: 1668 #if IS_ENABLED(CONFIG_IPV6) 1669 if (p->sel.prefixlen_d > 128 || p->sel.prefixlen_s > 128) { 1670 NL_SET_ERR_MSG(extack, "Invalid prefix length in selector (must be <= 128 for IPv6)"); 1671 return -EINVAL; 1672 } 1673 1674 break; 1675 #else 1676 NL_SET_ERR_MSG(extack, "IPv6 support disabled"); 1677 return -EAFNOSUPPORT; 1678 #endif 1679 1680 default: 1681 NL_SET_ERR_MSG(extack, "Invalid selector family"); 1682 return -EINVAL; 1683 } 1684 1685 ret = verify_policy_dir(p->dir, extack); 1686 if (ret) 1687 return ret; 1688 if (p->index && (xfrm_policy_id2dir(p->index) != p->dir)) { 1689 NL_SET_ERR_MSG(extack, "Policy index doesn't match direction"); 1690 return -EINVAL; 1691 } 1692 1693 return 0; 1694 } 1695 1696 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs) 1697 { 1698 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 1699 struct xfrm_user_sec_ctx *uctx; 1700 1701 if (!rt) 1702 return 0; 1703 1704 uctx = nla_data(rt); 1705 return security_xfrm_policy_alloc(&pol->security, uctx, GFP_KERNEL); 1706 } 1707 1708 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut, 1709 int nr) 1710 { 1711 int i; 1712 1713 xp->xfrm_nr = nr; 1714 for (i = 0; i < nr; i++, ut++) { 1715 struct xfrm_tmpl *t = &xp->xfrm_vec[i]; 1716 1717 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id)); 1718 memcpy(&t->saddr, &ut->saddr, 1719 sizeof(xfrm_address_t)); 1720 t->reqid = ut->reqid; 1721 t->mode = ut->mode; 1722 t->share = ut->share; 1723 t->optional = ut->optional; 1724 t->aalgos = ut->aalgos; 1725 t->ealgos = ut->ealgos; 1726 t->calgos = ut->calgos; 1727 /* If all masks are ~0, then we allow all algorithms. */ 1728 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos); 1729 t->encap_family = ut->family; 1730 } 1731 } 1732 1733 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family, 1734 struct netlink_ext_ack *extack) 1735 { 1736 u16 prev_family; 1737 int i; 1738 1739 if (nr > XFRM_MAX_DEPTH) { 1740 NL_SET_ERR_MSG(extack, "Template count must be <= XFRM_MAX_DEPTH (" __stringify(XFRM_MAX_DEPTH) ")"); 1741 return -EINVAL; 1742 } 1743 1744 prev_family = family; 1745 1746 for (i = 0; i < nr; i++) { 1747 /* We never validated the ut->family value, so many 1748 * applications simply leave it at zero. The check was 1749 * never made and ut->family was ignored because all 1750 * templates could be assumed to have the same family as 1751 * the policy itself. Now that we will have ipv4-in-ipv6 1752 * and ipv6-in-ipv4 tunnels, this is no longer true. 1753 */ 1754 if (!ut[i].family) 1755 ut[i].family = family; 1756 1757 switch (ut[i].mode) { 1758 case XFRM_MODE_TUNNEL: 1759 case XFRM_MODE_BEET: 1760 break; 1761 default: 1762 if (ut[i].family != prev_family) { 1763 NL_SET_ERR_MSG(extack, "Mode in template doesn't support a family change"); 1764 return -EINVAL; 1765 } 1766 break; 1767 } 1768 if (ut[i].mode >= XFRM_MODE_MAX) { 1769 NL_SET_ERR_MSG(extack, "Mode in template must be < XFRM_MODE_MAX (" __stringify(XFRM_MODE_MAX) ")"); 1770 return -EINVAL; 1771 } 1772 1773 prev_family = ut[i].family; 1774 1775 switch (ut[i].family) { 1776 case AF_INET: 1777 break; 1778 #if IS_ENABLED(CONFIG_IPV6) 1779 case AF_INET6: 1780 break; 1781 #endif 1782 default: 1783 NL_SET_ERR_MSG(extack, "Invalid family in template"); 1784 return -EINVAL; 1785 } 1786 1787 if (!xfrm_id_proto_valid(ut[i].id.proto)) { 1788 NL_SET_ERR_MSG(extack, "Invalid XFRM protocol in template"); 1789 return -EINVAL; 1790 } 1791 } 1792 1793 return 0; 1794 } 1795 1796 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs, 1797 struct netlink_ext_ack *extack) 1798 { 1799 struct nlattr *rt = attrs[XFRMA_TMPL]; 1800 1801 if (!rt) { 1802 pol->xfrm_nr = 0; 1803 } else { 1804 struct xfrm_user_tmpl *utmpl = nla_data(rt); 1805 int nr = nla_len(rt) / sizeof(*utmpl); 1806 int err; 1807 1808 err = validate_tmpl(nr, utmpl, pol->family, extack); 1809 if (err) 1810 return err; 1811 1812 copy_templates(pol, utmpl, nr); 1813 } 1814 return 0; 1815 } 1816 1817 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs, 1818 struct netlink_ext_ack *extack) 1819 { 1820 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE]; 1821 struct xfrm_userpolicy_type *upt; 1822 u8 type = XFRM_POLICY_TYPE_MAIN; 1823 int err; 1824 1825 if (rt) { 1826 upt = nla_data(rt); 1827 type = upt->type; 1828 } 1829 1830 err = verify_policy_type(type, extack); 1831 if (err) 1832 return err; 1833 1834 *tp = type; 1835 return 0; 1836 } 1837 1838 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p) 1839 { 1840 xp->priority = p->priority; 1841 xp->index = p->index; 1842 memcpy(&xp->selector, &p->sel, sizeof(xp->selector)); 1843 memcpy(&xp->lft, &p->lft, sizeof(xp->lft)); 1844 xp->action = p->action; 1845 xp->flags = p->flags; 1846 xp->family = p->sel.family; 1847 /* XXX xp->share = p->share; */ 1848 } 1849 1850 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir) 1851 { 1852 memset(p, 0, sizeof(*p)); 1853 memcpy(&p->sel, &xp->selector, sizeof(p->sel)); 1854 memcpy(&p->lft, &xp->lft, sizeof(p->lft)); 1855 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft)); 1856 p->priority = xp->priority; 1857 p->index = xp->index; 1858 p->sel.family = xp->family; 1859 p->dir = dir; 1860 p->action = xp->action; 1861 p->flags = xp->flags; 1862 p->share = XFRM_SHARE_ANY; /* XXX xp->share */ 1863 } 1864 1865 static struct xfrm_policy *xfrm_policy_construct(struct net *net, 1866 struct xfrm_userpolicy_info *p, 1867 struct nlattr **attrs, 1868 int *errp, 1869 struct netlink_ext_ack *extack) 1870 { 1871 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL); 1872 int err; 1873 1874 if (!xp) { 1875 *errp = -ENOMEM; 1876 return NULL; 1877 } 1878 1879 copy_from_user_policy(xp, p); 1880 1881 err = copy_from_user_policy_type(&xp->type, attrs, extack); 1882 if (err) 1883 goto error; 1884 1885 if (!(err = copy_from_user_tmpl(xp, attrs, extack))) 1886 err = copy_from_user_sec_ctx(xp, attrs); 1887 if (err) 1888 goto error; 1889 1890 xfrm_mark_get(attrs, &xp->mark); 1891 1892 if (attrs[XFRMA_IF_ID]) 1893 xp->if_id = nla_get_u32(attrs[XFRMA_IF_ID]); 1894 1895 /* configure the hardware if offload is requested */ 1896 if (attrs[XFRMA_OFFLOAD_DEV]) { 1897 err = xfrm_dev_policy_add(net, xp, 1898 nla_data(attrs[XFRMA_OFFLOAD_DEV]), 1899 p->dir, extack); 1900 if (err) 1901 goto error; 1902 } 1903 1904 return xp; 1905 error: 1906 *errp = err; 1907 xp->walk.dead = 1; 1908 xfrm_policy_destroy(xp); 1909 return NULL; 1910 } 1911 1912 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 1913 struct nlattr **attrs, 1914 struct netlink_ext_ack *extack) 1915 { 1916 struct net *net = sock_net(skb->sk); 1917 struct xfrm_userpolicy_info *p = nlmsg_data(nlh); 1918 struct xfrm_policy *xp; 1919 struct km_event c; 1920 int err; 1921 int excl; 1922 1923 err = verify_newpolicy_info(p, extack); 1924 if (err) 1925 return err; 1926 err = verify_sec_ctx_len(attrs, extack); 1927 if (err) 1928 return err; 1929 1930 xp = xfrm_policy_construct(net, p, attrs, &err, extack); 1931 if (!xp) 1932 return err; 1933 1934 /* shouldn't excl be based on nlh flags?? 1935 * Aha! this is anti-netlink really i.e more pfkey derived 1936 * in netlink excl is a flag and you wouldn't need 1937 * a type XFRM_MSG_UPDPOLICY - JHS */ 1938 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY; 1939 err = xfrm_policy_insert(p->dir, xp, excl); 1940 xfrm_audit_policy_add(xp, err ? 0 : 1, true); 1941 1942 if (err) { 1943 xfrm_dev_policy_delete(xp); 1944 security_xfrm_policy_free(xp->security); 1945 kfree(xp); 1946 return err; 1947 } 1948 1949 c.event = nlh->nlmsg_type; 1950 c.seq = nlh->nlmsg_seq; 1951 c.portid = nlh->nlmsg_pid; 1952 km_policy_notify(xp, p->dir, &c); 1953 1954 xfrm_pol_put(xp); 1955 1956 return 0; 1957 } 1958 1959 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb) 1960 { 1961 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH]; 1962 int i; 1963 1964 if (xp->xfrm_nr == 0) 1965 return 0; 1966 1967 for (i = 0; i < xp->xfrm_nr; i++) { 1968 struct xfrm_user_tmpl *up = &vec[i]; 1969 struct xfrm_tmpl *kp = &xp->xfrm_vec[i]; 1970 1971 memset(up, 0, sizeof(*up)); 1972 memcpy(&up->id, &kp->id, sizeof(up->id)); 1973 up->family = kp->encap_family; 1974 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr)); 1975 up->reqid = kp->reqid; 1976 up->mode = kp->mode; 1977 up->share = kp->share; 1978 up->optional = kp->optional; 1979 up->aalgos = kp->aalgos; 1980 up->ealgos = kp->ealgos; 1981 up->calgos = kp->calgos; 1982 } 1983 1984 return nla_put(skb, XFRMA_TMPL, 1985 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec); 1986 } 1987 1988 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb) 1989 { 1990 if (x->security) { 1991 return copy_sec_ctx(x->security, skb); 1992 } 1993 return 0; 1994 } 1995 1996 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb) 1997 { 1998 if (xp->security) 1999 return copy_sec_ctx(xp->security, skb); 2000 return 0; 2001 } 2002 static inline unsigned int userpolicy_type_attrsize(void) 2003 { 2004 #ifdef CONFIG_XFRM_SUB_POLICY 2005 return nla_total_size(sizeof(struct xfrm_userpolicy_type)); 2006 #else 2007 return 0; 2008 #endif 2009 } 2010 2011 #ifdef CONFIG_XFRM_SUB_POLICY 2012 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb) 2013 { 2014 struct xfrm_userpolicy_type upt; 2015 2016 /* Sadly there are two holes in struct xfrm_userpolicy_type */ 2017 memset(&upt, 0, sizeof(upt)); 2018 upt.type = type; 2019 2020 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt); 2021 } 2022 2023 #else 2024 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb) 2025 { 2026 return 0; 2027 } 2028 #endif 2029 2030 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr) 2031 { 2032 struct xfrm_dump_info *sp = ptr; 2033 struct xfrm_userpolicy_info *p; 2034 struct sk_buff *in_skb = sp->in_skb; 2035 struct sk_buff *skb = sp->out_skb; 2036 struct xfrm_translator *xtr; 2037 struct nlmsghdr *nlh; 2038 int err; 2039 2040 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq, 2041 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags); 2042 if (nlh == NULL) 2043 return -EMSGSIZE; 2044 2045 p = nlmsg_data(nlh); 2046 copy_to_user_policy(xp, p, dir); 2047 err = copy_to_user_tmpl(xp, skb); 2048 if (!err) 2049 err = copy_to_user_sec_ctx(xp, skb); 2050 if (!err) 2051 err = copy_to_user_policy_type(xp->type, skb); 2052 if (!err) 2053 err = xfrm_mark_put(skb, &xp->mark); 2054 if (!err) 2055 err = xfrm_if_id_put(skb, xp->if_id); 2056 if (!err && xp->xdo.dev) 2057 err = copy_user_offload(&xp->xdo, skb); 2058 if (err) { 2059 nlmsg_cancel(skb, nlh); 2060 return err; 2061 } 2062 nlmsg_end(skb, nlh); 2063 2064 xtr = xfrm_get_translator(); 2065 if (xtr) { 2066 err = xtr->alloc_compat(skb, nlh); 2067 2068 xfrm_put_translator(xtr); 2069 if (err) { 2070 nlmsg_cancel(skb, nlh); 2071 return err; 2072 } 2073 } 2074 2075 return 0; 2076 } 2077 2078 static int xfrm_dump_policy_done(struct netlink_callback *cb) 2079 { 2080 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args; 2081 struct net *net = sock_net(cb->skb->sk); 2082 2083 xfrm_policy_walk_done(walk, net); 2084 return 0; 2085 } 2086 2087 static int xfrm_dump_policy_start(struct netlink_callback *cb) 2088 { 2089 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args; 2090 2091 BUILD_BUG_ON(sizeof(*walk) > sizeof(cb->args)); 2092 2093 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY); 2094 return 0; 2095 } 2096 2097 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb) 2098 { 2099 struct net *net = sock_net(skb->sk); 2100 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args; 2101 struct xfrm_dump_info info; 2102 2103 info.in_skb = cb->skb; 2104 info.out_skb = skb; 2105 info.nlmsg_seq = cb->nlh->nlmsg_seq; 2106 info.nlmsg_flags = NLM_F_MULTI; 2107 2108 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info); 2109 2110 return skb->len; 2111 } 2112 2113 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb, 2114 struct xfrm_policy *xp, 2115 int dir, u32 seq) 2116 { 2117 struct xfrm_dump_info info; 2118 struct sk_buff *skb; 2119 int err; 2120 2121 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 2122 if (!skb) 2123 return ERR_PTR(-ENOMEM); 2124 2125 info.in_skb = in_skb; 2126 info.out_skb = skb; 2127 info.nlmsg_seq = seq; 2128 info.nlmsg_flags = 0; 2129 2130 err = dump_one_policy(xp, dir, 0, &info); 2131 if (err) { 2132 kfree_skb(skb); 2133 return ERR_PTR(err); 2134 } 2135 2136 return skb; 2137 } 2138 2139 static int xfrm_notify_userpolicy(struct net *net) 2140 { 2141 struct xfrm_userpolicy_default *up; 2142 int len = NLMSG_ALIGN(sizeof(*up)); 2143 struct nlmsghdr *nlh; 2144 struct sk_buff *skb; 2145 int err; 2146 2147 skb = nlmsg_new(len, GFP_ATOMIC); 2148 if (skb == NULL) 2149 return -ENOMEM; 2150 2151 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_GETDEFAULT, sizeof(*up), 0); 2152 if (nlh == NULL) { 2153 kfree_skb(skb); 2154 return -EMSGSIZE; 2155 } 2156 2157 up = nlmsg_data(nlh); 2158 up->in = net->xfrm.policy_default[XFRM_POLICY_IN]; 2159 up->fwd = net->xfrm.policy_default[XFRM_POLICY_FWD]; 2160 up->out = net->xfrm.policy_default[XFRM_POLICY_OUT]; 2161 2162 nlmsg_end(skb, nlh); 2163 2164 rcu_read_lock(); 2165 err = xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY); 2166 rcu_read_unlock(); 2167 2168 return err; 2169 } 2170 2171 static bool xfrm_userpolicy_is_valid(__u8 policy) 2172 { 2173 return policy == XFRM_USERPOLICY_BLOCK || 2174 policy == XFRM_USERPOLICY_ACCEPT; 2175 } 2176 2177 static int xfrm_set_default(struct sk_buff *skb, struct nlmsghdr *nlh, 2178 struct nlattr **attrs, struct netlink_ext_ack *extack) 2179 { 2180 struct net *net = sock_net(skb->sk); 2181 struct xfrm_userpolicy_default *up = nlmsg_data(nlh); 2182 2183 if (xfrm_userpolicy_is_valid(up->in)) 2184 net->xfrm.policy_default[XFRM_POLICY_IN] = up->in; 2185 2186 if (xfrm_userpolicy_is_valid(up->fwd)) 2187 net->xfrm.policy_default[XFRM_POLICY_FWD] = up->fwd; 2188 2189 if (xfrm_userpolicy_is_valid(up->out)) 2190 net->xfrm.policy_default[XFRM_POLICY_OUT] = up->out; 2191 2192 rt_genid_bump_all(net); 2193 2194 xfrm_notify_userpolicy(net); 2195 return 0; 2196 } 2197 2198 static int xfrm_get_default(struct sk_buff *skb, struct nlmsghdr *nlh, 2199 struct nlattr **attrs, struct netlink_ext_ack *extack) 2200 { 2201 struct sk_buff *r_skb; 2202 struct nlmsghdr *r_nlh; 2203 struct net *net = sock_net(skb->sk); 2204 struct xfrm_userpolicy_default *r_up; 2205 int len = NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_default)); 2206 u32 portid = NETLINK_CB(skb).portid; 2207 u32 seq = nlh->nlmsg_seq; 2208 2209 r_skb = nlmsg_new(len, GFP_ATOMIC); 2210 if (!r_skb) 2211 return -ENOMEM; 2212 2213 r_nlh = nlmsg_put(r_skb, portid, seq, XFRM_MSG_GETDEFAULT, sizeof(*r_up), 0); 2214 if (!r_nlh) { 2215 kfree_skb(r_skb); 2216 return -EMSGSIZE; 2217 } 2218 2219 r_up = nlmsg_data(r_nlh); 2220 r_up->in = net->xfrm.policy_default[XFRM_POLICY_IN]; 2221 r_up->fwd = net->xfrm.policy_default[XFRM_POLICY_FWD]; 2222 r_up->out = net->xfrm.policy_default[XFRM_POLICY_OUT]; 2223 nlmsg_end(r_skb, r_nlh); 2224 2225 return nlmsg_unicast(net->xfrm.nlsk, r_skb, portid); 2226 } 2227 2228 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 2229 struct nlattr **attrs, 2230 struct netlink_ext_ack *extack) 2231 { 2232 struct net *net = sock_net(skb->sk); 2233 struct xfrm_policy *xp; 2234 struct xfrm_userpolicy_id *p; 2235 u8 type = XFRM_POLICY_TYPE_MAIN; 2236 int err; 2237 struct km_event c; 2238 int delete; 2239 struct xfrm_mark m; 2240 u32 if_id = 0; 2241 2242 p = nlmsg_data(nlh); 2243 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY; 2244 2245 err = copy_from_user_policy_type(&type, attrs, extack); 2246 if (err) 2247 return err; 2248 2249 err = verify_policy_dir(p->dir, extack); 2250 if (err) 2251 return err; 2252 2253 if (attrs[XFRMA_IF_ID]) 2254 if_id = nla_get_u32(attrs[XFRMA_IF_ID]); 2255 2256 xfrm_mark_get(attrs, &m); 2257 2258 if (p->index) 2259 xp = xfrm_policy_byid(net, &m, if_id, type, p->dir, 2260 p->index, delete, &err); 2261 else { 2262 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 2263 struct xfrm_sec_ctx *ctx; 2264 2265 err = verify_sec_ctx_len(attrs, extack); 2266 if (err) 2267 return err; 2268 2269 ctx = NULL; 2270 if (rt) { 2271 struct xfrm_user_sec_ctx *uctx = nla_data(rt); 2272 2273 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL); 2274 if (err) 2275 return err; 2276 } 2277 xp = xfrm_policy_bysel_ctx(net, &m, if_id, type, p->dir, 2278 &p->sel, ctx, delete, &err); 2279 security_xfrm_policy_free(ctx); 2280 } 2281 if (xp == NULL) 2282 return -ENOENT; 2283 2284 if (!delete) { 2285 struct sk_buff *resp_skb; 2286 2287 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq); 2288 if (IS_ERR(resp_skb)) { 2289 err = PTR_ERR(resp_skb); 2290 } else { 2291 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, 2292 NETLINK_CB(skb).portid); 2293 } 2294 } else { 2295 xfrm_audit_policy_delete(xp, err ? 0 : 1, true); 2296 2297 if (err != 0) 2298 goto out; 2299 2300 c.data.byid = p->index; 2301 c.event = nlh->nlmsg_type; 2302 c.seq = nlh->nlmsg_seq; 2303 c.portid = nlh->nlmsg_pid; 2304 km_policy_notify(xp, p->dir, &c); 2305 } 2306 2307 out: 2308 xfrm_pol_put(xp); 2309 return err; 2310 } 2311 2312 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 2313 struct nlattr **attrs, 2314 struct netlink_ext_ack *extack) 2315 { 2316 struct net *net = sock_net(skb->sk); 2317 struct km_event c; 2318 struct xfrm_usersa_flush *p = nlmsg_data(nlh); 2319 int err; 2320 2321 err = xfrm_state_flush(net, p->proto, true, false); 2322 if (err) { 2323 if (err == -ESRCH) /* empty table */ 2324 return 0; 2325 return err; 2326 } 2327 c.data.proto = p->proto; 2328 c.event = nlh->nlmsg_type; 2329 c.seq = nlh->nlmsg_seq; 2330 c.portid = nlh->nlmsg_pid; 2331 c.net = net; 2332 km_state_notify(NULL, &c); 2333 2334 return 0; 2335 } 2336 2337 static inline unsigned int xfrm_aevent_msgsize(struct xfrm_state *x) 2338 { 2339 unsigned int replay_size = x->replay_esn ? 2340 xfrm_replay_state_esn_len(x->replay_esn) : 2341 sizeof(struct xfrm_replay_state); 2342 2343 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id)) 2344 + nla_total_size(replay_size) 2345 + nla_total_size_64bit(sizeof(struct xfrm_lifetime_cur)) 2346 + nla_total_size(sizeof(struct xfrm_mark)) 2347 + nla_total_size(4) /* XFRM_AE_RTHR */ 2348 + nla_total_size(4); /* XFRM_AE_ETHR */ 2349 } 2350 2351 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c) 2352 { 2353 struct xfrm_aevent_id *id; 2354 struct nlmsghdr *nlh; 2355 int err; 2356 2357 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0); 2358 if (nlh == NULL) 2359 return -EMSGSIZE; 2360 2361 id = nlmsg_data(nlh); 2362 memset(&id->sa_id, 0, sizeof(id->sa_id)); 2363 memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr)); 2364 id->sa_id.spi = x->id.spi; 2365 id->sa_id.family = x->props.family; 2366 id->sa_id.proto = x->id.proto; 2367 memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr)); 2368 id->reqid = x->props.reqid; 2369 id->flags = c->data.aevent; 2370 2371 if (x->replay_esn) { 2372 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL, 2373 xfrm_replay_state_esn_len(x->replay_esn), 2374 x->replay_esn); 2375 } else { 2376 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), 2377 &x->replay); 2378 } 2379 if (err) 2380 goto out_cancel; 2381 err = nla_put_64bit(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft, 2382 XFRMA_PAD); 2383 if (err) 2384 goto out_cancel; 2385 2386 if (id->flags & XFRM_AE_RTHR) { 2387 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff); 2388 if (err) 2389 goto out_cancel; 2390 } 2391 if (id->flags & XFRM_AE_ETHR) { 2392 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH, 2393 x->replay_maxage * 10 / HZ); 2394 if (err) 2395 goto out_cancel; 2396 } 2397 err = xfrm_mark_put(skb, &x->mark); 2398 if (err) 2399 goto out_cancel; 2400 2401 err = xfrm_if_id_put(skb, x->if_id); 2402 if (err) 2403 goto out_cancel; 2404 2405 nlmsg_end(skb, nlh); 2406 return 0; 2407 2408 out_cancel: 2409 nlmsg_cancel(skb, nlh); 2410 return err; 2411 } 2412 2413 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh, 2414 struct nlattr **attrs, struct netlink_ext_ack *extack) 2415 { 2416 struct net *net = sock_net(skb->sk); 2417 struct xfrm_state *x; 2418 struct sk_buff *r_skb; 2419 int err; 2420 struct km_event c; 2421 u32 mark; 2422 struct xfrm_mark m; 2423 struct xfrm_aevent_id *p = nlmsg_data(nlh); 2424 struct xfrm_usersa_id *id = &p->sa_id; 2425 2426 mark = xfrm_mark_get(attrs, &m); 2427 2428 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family); 2429 if (x == NULL) 2430 return -ESRCH; 2431 2432 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC); 2433 if (r_skb == NULL) { 2434 xfrm_state_put(x); 2435 return -ENOMEM; 2436 } 2437 2438 /* 2439 * XXX: is this lock really needed - none of the other 2440 * gets lock (the concern is things getting updated 2441 * while we are still reading) - jhs 2442 */ 2443 spin_lock_bh(&x->lock); 2444 c.data.aevent = p->flags; 2445 c.seq = nlh->nlmsg_seq; 2446 c.portid = nlh->nlmsg_pid; 2447 2448 err = build_aevent(r_skb, x, &c); 2449 BUG_ON(err < 0); 2450 2451 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid); 2452 spin_unlock_bh(&x->lock); 2453 xfrm_state_put(x); 2454 return err; 2455 } 2456 2457 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh, 2458 struct nlattr **attrs, struct netlink_ext_ack *extack) 2459 { 2460 struct net *net = sock_net(skb->sk); 2461 struct xfrm_state *x; 2462 struct km_event c; 2463 int err = -EINVAL; 2464 u32 mark = 0; 2465 struct xfrm_mark m; 2466 struct xfrm_aevent_id *p = nlmsg_data(nlh); 2467 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL]; 2468 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL]; 2469 struct nlattr *lt = attrs[XFRMA_LTIME_VAL]; 2470 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH]; 2471 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH]; 2472 2473 if (!lt && !rp && !re && !et && !rt) { 2474 NL_SET_ERR_MSG(extack, "Missing required attribute for AE"); 2475 return err; 2476 } 2477 2478 /* pedantic mode - thou shalt sayeth replaceth */ 2479 if (!(nlh->nlmsg_flags & NLM_F_REPLACE)) { 2480 NL_SET_ERR_MSG(extack, "NLM_F_REPLACE flag is required"); 2481 return err; 2482 } 2483 2484 mark = xfrm_mark_get(attrs, &m); 2485 2486 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family); 2487 if (x == NULL) 2488 return -ESRCH; 2489 2490 if (x->km.state != XFRM_STATE_VALID) { 2491 NL_SET_ERR_MSG(extack, "SA must be in VALID state"); 2492 goto out; 2493 } 2494 2495 err = xfrm_replay_verify_len(x->replay_esn, re, extack); 2496 if (err) 2497 goto out; 2498 2499 spin_lock_bh(&x->lock); 2500 xfrm_update_ae_params(x, attrs, 1); 2501 spin_unlock_bh(&x->lock); 2502 2503 c.event = nlh->nlmsg_type; 2504 c.seq = nlh->nlmsg_seq; 2505 c.portid = nlh->nlmsg_pid; 2506 c.data.aevent = XFRM_AE_CU; 2507 km_state_notify(x, &c); 2508 err = 0; 2509 out: 2510 xfrm_state_put(x); 2511 return err; 2512 } 2513 2514 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 2515 struct nlattr **attrs, 2516 struct netlink_ext_ack *extack) 2517 { 2518 struct net *net = sock_net(skb->sk); 2519 struct km_event c; 2520 u8 type = XFRM_POLICY_TYPE_MAIN; 2521 int err; 2522 2523 err = copy_from_user_policy_type(&type, attrs, extack); 2524 if (err) 2525 return err; 2526 2527 err = xfrm_policy_flush(net, type, true); 2528 if (err) { 2529 if (err == -ESRCH) /* empty table */ 2530 return 0; 2531 return err; 2532 } 2533 2534 c.data.type = type; 2535 c.event = nlh->nlmsg_type; 2536 c.seq = nlh->nlmsg_seq; 2537 c.portid = nlh->nlmsg_pid; 2538 c.net = net; 2539 km_policy_notify(NULL, 0, &c); 2540 return 0; 2541 } 2542 2543 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh, 2544 struct nlattr **attrs, 2545 struct netlink_ext_ack *extack) 2546 { 2547 struct net *net = sock_net(skb->sk); 2548 struct xfrm_policy *xp; 2549 struct xfrm_user_polexpire *up = nlmsg_data(nlh); 2550 struct xfrm_userpolicy_info *p = &up->pol; 2551 u8 type = XFRM_POLICY_TYPE_MAIN; 2552 int err = -ENOENT; 2553 struct xfrm_mark m; 2554 u32 if_id = 0; 2555 2556 err = copy_from_user_policy_type(&type, attrs, extack); 2557 if (err) 2558 return err; 2559 2560 err = verify_policy_dir(p->dir, extack); 2561 if (err) 2562 return err; 2563 2564 if (attrs[XFRMA_IF_ID]) 2565 if_id = nla_get_u32(attrs[XFRMA_IF_ID]); 2566 2567 xfrm_mark_get(attrs, &m); 2568 2569 if (p->index) 2570 xp = xfrm_policy_byid(net, &m, if_id, type, p->dir, p->index, 2571 0, &err); 2572 else { 2573 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 2574 struct xfrm_sec_ctx *ctx; 2575 2576 err = verify_sec_ctx_len(attrs, extack); 2577 if (err) 2578 return err; 2579 2580 ctx = NULL; 2581 if (rt) { 2582 struct xfrm_user_sec_ctx *uctx = nla_data(rt); 2583 2584 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL); 2585 if (err) 2586 return err; 2587 } 2588 xp = xfrm_policy_bysel_ctx(net, &m, if_id, type, p->dir, 2589 &p->sel, ctx, 0, &err); 2590 security_xfrm_policy_free(ctx); 2591 } 2592 if (xp == NULL) 2593 return -ENOENT; 2594 2595 if (unlikely(xp->walk.dead)) 2596 goto out; 2597 2598 err = 0; 2599 if (up->hard) { 2600 xfrm_policy_delete(xp, p->dir); 2601 xfrm_audit_policy_delete(xp, 1, true); 2602 } 2603 km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid); 2604 2605 out: 2606 xfrm_pol_put(xp); 2607 return err; 2608 } 2609 2610 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh, 2611 struct nlattr **attrs, 2612 struct netlink_ext_ack *extack) 2613 { 2614 struct net *net = sock_net(skb->sk); 2615 struct xfrm_state *x; 2616 int err; 2617 struct xfrm_user_expire *ue = nlmsg_data(nlh); 2618 struct xfrm_usersa_info *p = &ue->state; 2619 struct xfrm_mark m; 2620 u32 mark = xfrm_mark_get(attrs, &m); 2621 2622 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family); 2623 2624 err = -ENOENT; 2625 if (x == NULL) 2626 return err; 2627 2628 spin_lock_bh(&x->lock); 2629 err = -EINVAL; 2630 if (x->km.state != XFRM_STATE_VALID) { 2631 NL_SET_ERR_MSG(extack, "SA must be in VALID state"); 2632 goto out; 2633 } 2634 2635 km_state_expired(x, ue->hard, nlh->nlmsg_pid); 2636 2637 if (ue->hard) { 2638 __xfrm_state_delete(x); 2639 xfrm_audit_state_delete(x, 1, true); 2640 } 2641 err = 0; 2642 out: 2643 spin_unlock_bh(&x->lock); 2644 xfrm_state_put(x); 2645 return err; 2646 } 2647 2648 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh, 2649 struct nlattr **attrs, 2650 struct netlink_ext_ack *extack) 2651 { 2652 struct net *net = sock_net(skb->sk); 2653 struct xfrm_policy *xp; 2654 struct xfrm_user_tmpl *ut; 2655 int i; 2656 struct nlattr *rt = attrs[XFRMA_TMPL]; 2657 struct xfrm_mark mark; 2658 2659 struct xfrm_user_acquire *ua = nlmsg_data(nlh); 2660 struct xfrm_state *x = xfrm_state_alloc(net); 2661 int err = -ENOMEM; 2662 2663 if (!x) 2664 goto nomem; 2665 2666 xfrm_mark_get(attrs, &mark); 2667 2668 err = verify_newpolicy_info(&ua->policy, extack); 2669 if (err) 2670 goto free_state; 2671 err = verify_sec_ctx_len(attrs, extack); 2672 if (err) 2673 goto free_state; 2674 2675 /* build an XP */ 2676 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err, extack); 2677 if (!xp) 2678 goto free_state; 2679 2680 memcpy(&x->id, &ua->id, sizeof(ua->id)); 2681 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr)); 2682 memcpy(&x->sel, &ua->sel, sizeof(ua->sel)); 2683 xp->mark.m = x->mark.m = mark.m; 2684 xp->mark.v = x->mark.v = mark.v; 2685 ut = nla_data(rt); 2686 /* extract the templates and for each call km_key */ 2687 for (i = 0; i < xp->xfrm_nr; i++, ut++) { 2688 struct xfrm_tmpl *t = &xp->xfrm_vec[i]; 2689 memcpy(&x->id, &t->id, sizeof(x->id)); 2690 x->props.mode = t->mode; 2691 x->props.reqid = t->reqid; 2692 x->props.family = ut->family; 2693 t->aalgos = ua->aalgos; 2694 t->ealgos = ua->ealgos; 2695 t->calgos = ua->calgos; 2696 err = km_query(x, t, xp); 2697 2698 } 2699 2700 xfrm_state_free(x); 2701 kfree(xp); 2702 2703 return 0; 2704 2705 free_state: 2706 xfrm_state_free(x); 2707 nomem: 2708 return err; 2709 } 2710 2711 #ifdef CONFIG_XFRM_MIGRATE 2712 static int copy_from_user_migrate(struct xfrm_migrate *ma, 2713 struct xfrm_kmaddress *k, 2714 struct nlattr **attrs, int *num, 2715 struct netlink_ext_ack *extack) 2716 { 2717 struct nlattr *rt = attrs[XFRMA_MIGRATE]; 2718 struct xfrm_user_migrate *um; 2719 int i, num_migrate; 2720 2721 if (k != NULL) { 2722 struct xfrm_user_kmaddress *uk; 2723 2724 uk = nla_data(attrs[XFRMA_KMADDRESS]); 2725 memcpy(&k->local, &uk->local, sizeof(k->local)); 2726 memcpy(&k->remote, &uk->remote, sizeof(k->remote)); 2727 k->family = uk->family; 2728 k->reserved = uk->reserved; 2729 } 2730 2731 um = nla_data(rt); 2732 num_migrate = nla_len(rt) / sizeof(*um); 2733 2734 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH) { 2735 NL_SET_ERR_MSG(extack, "Invalid number of SAs to migrate, must be 0 < num <= XFRM_MAX_DEPTH (6)"); 2736 return -EINVAL; 2737 } 2738 2739 for (i = 0; i < num_migrate; i++, um++, ma++) { 2740 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr)); 2741 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr)); 2742 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr)); 2743 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr)); 2744 2745 ma->proto = um->proto; 2746 ma->mode = um->mode; 2747 ma->reqid = um->reqid; 2748 2749 ma->old_family = um->old_family; 2750 ma->new_family = um->new_family; 2751 } 2752 2753 *num = i; 2754 return 0; 2755 } 2756 2757 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh, 2758 struct nlattr **attrs, struct netlink_ext_ack *extack) 2759 { 2760 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh); 2761 struct xfrm_migrate m[XFRM_MAX_DEPTH]; 2762 struct xfrm_kmaddress km, *kmp; 2763 u8 type; 2764 int err; 2765 int n = 0; 2766 struct net *net = sock_net(skb->sk); 2767 struct xfrm_encap_tmpl *encap = NULL; 2768 u32 if_id = 0; 2769 2770 if (!attrs[XFRMA_MIGRATE]) { 2771 NL_SET_ERR_MSG(extack, "Missing required MIGRATE attribute"); 2772 return -EINVAL; 2773 } 2774 2775 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL; 2776 2777 err = copy_from_user_policy_type(&type, attrs, extack); 2778 if (err) 2779 return err; 2780 2781 err = copy_from_user_migrate(m, kmp, attrs, &n, extack); 2782 if (err) 2783 return err; 2784 2785 if (!n) 2786 return 0; 2787 2788 if (attrs[XFRMA_ENCAP]) { 2789 encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]), 2790 sizeof(*encap), GFP_KERNEL); 2791 if (!encap) 2792 return -ENOMEM; 2793 } 2794 2795 if (attrs[XFRMA_IF_ID]) 2796 if_id = nla_get_u32(attrs[XFRMA_IF_ID]); 2797 2798 err = xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net, encap, 2799 if_id, extack); 2800 2801 kfree(encap); 2802 2803 return err; 2804 } 2805 #else 2806 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh, 2807 struct nlattr **attrs, struct netlink_ext_ack *extack) 2808 { 2809 return -ENOPROTOOPT; 2810 } 2811 #endif 2812 2813 #ifdef CONFIG_XFRM_MIGRATE 2814 static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb) 2815 { 2816 struct xfrm_user_migrate um; 2817 2818 memset(&um, 0, sizeof(um)); 2819 um.proto = m->proto; 2820 um.mode = m->mode; 2821 um.reqid = m->reqid; 2822 um.old_family = m->old_family; 2823 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr)); 2824 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr)); 2825 um.new_family = m->new_family; 2826 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr)); 2827 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr)); 2828 2829 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um); 2830 } 2831 2832 static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb) 2833 { 2834 struct xfrm_user_kmaddress uk; 2835 2836 memset(&uk, 0, sizeof(uk)); 2837 uk.family = k->family; 2838 uk.reserved = k->reserved; 2839 memcpy(&uk.local, &k->local, sizeof(uk.local)); 2840 memcpy(&uk.remote, &k->remote, sizeof(uk.remote)); 2841 2842 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk); 2843 } 2844 2845 static inline unsigned int xfrm_migrate_msgsize(int num_migrate, int with_kma, 2846 int with_encp) 2847 { 2848 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id)) 2849 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0) 2850 + (with_encp ? nla_total_size(sizeof(struct xfrm_encap_tmpl)) : 0) 2851 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate) 2852 + userpolicy_type_attrsize(); 2853 } 2854 2855 static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m, 2856 int num_migrate, const struct xfrm_kmaddress *k, 2857 const struct xfrm_selector *sel, 2858 const struct xfrm_encap_tmpl *encap, u8 dir, u8 type) 2859 { 2860 const struct xfrm_migrate *mp; 2861 struct xfrm_userpolicy_id *pol_id; 2862 struct nlmsghdr *nlh; 2863 int i, err; 2864 2865 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0); 2866 if (nlh == NULL) 2867 return -EMSGSIZE; 2868 2869 pol_id = nlmsg_data(nlh); 2870 /* copy data from selector, dir, and type to the pol_id */ 2871 memset(pol_id, 0, sizeof(*pol_id)); 2872 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel)); 2873 pol_id->dir = dir; 2874 2875 if (k != NULL) { 2876 err = copy_to_user_kmaddress(k, skb); 2877 if (err) 2878 goto out_cancel; 2879 } 2880 if (encap) { 2881 err = nla_put(skb, XFRMA_ENCAP, sizeof(*encap), encap); 2882 if (err) 2883 goto out_cancel; 2884 } 2885 err = copy_to_user_policy_type(type, skb); 2886 if (err) 2887 goto out_cancel; 2888 for (i = 0, mp = m ; i < num_migrate; i++, mp++) { 2889 err = copy_to_user_migrate(mp, skb); 2890 if (err) 2891 goto out_cancel; 2892 } 2893 2894 nlmsg_end(skb, nlh); 2895 return 0; 2896 2897 out_cancel: 2898 nlmsg_cancel(skb, nlh); 2899 return err; 2900 } 2901 2902 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 2903 const struct xfrm_migrate *m, int num_migrate, 2904 const struct xfrm_kmaddress *k, 2905 const struct xfrm_encap_tmpl *encap) 2906 { 2907 struct net *net = &init_net; 2908 struct sk_buff *skb; 2909 int err; 2910 2911 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k, !!encap), 2912 GFP_ATOMIC); 2913 if (skb == NULL) 2914 return -ENOMEM; 2915 2916 /* build migrate */ 2917 err = build_migrate(skb, m, num_migrate, k, sel, encap, dir, type); 2918 BUG_ON(err < 0); 2919 2920 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE); 2921 } 2922 #else 2923 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 2924 const struct xfrm_migrate *m, int num_migrate, 2925 const struct xfrm_kmaddress *k, 2926 const struct xfrm_encap_tmpl *encap) 2927 { 2928 return -ENOPROTOOPT; 2929 } 2930 #endif 2931 2932 #define XMSGSIZE(type) sizeof(struct type) 2933 2934 const int xfrm_msg_min[XFRM_NR_MSGTYPES] = { 2935 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), 2936 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), 2937 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), 2938 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), 2939 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 2940 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 2941 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info), 2942 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire), 2943 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire), 2944 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), 2945 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), 2946 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire), 2947 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush), 2948 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0, 2949 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), 2950 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), 2951 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report), 2952 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 2953 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32), 2954 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = sizeof(u32), 2955 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32), 2956 [XFRM_MSG_SETDEFAULT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_default), 2957 [XFRM_MSG_GETDEFAULT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_default), 2958 }; 2959 EXPORT_SYMBOL_GPL(xfrm_msg_min); 2960 2961 #undef XMSGSIZE 2962 2963 const struct nla_policy xfrma_policy[XFRMA_MAX+1] = { 2964 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)}, 2965 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)}, 2966 [XFRMA_LASTUSED] = { .type = NLA_U64}, 2967 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)}, 2968 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) }, 2969 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) }, 2970 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) }, 2971 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) }, 2972 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) }, 2973 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) }, 2974 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) }, 2975 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) }, 2976 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) }, 2977 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 }, 2978 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 }, 2979 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) }, 2980 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) }, 2981 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)}, 2982 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) }, 2983 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) }, 2984 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) }, 2985 [XFRMA_TFCPAD] = { .type = NLA_U32 }, 2986 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) }, 2987 [XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 }, 2988 [XFRMA_PROTO] = { .type = NLA_U8 }, 2989 [XFRMA_ADDRESS_FILTER] = { .len = sizeof(struct xfrm_address_filter) }, 2990 [XFRMA_OFFLOAD_DEV] = { .len = sizeof(struct xfrm_user_offload) }, 2991 [XFRMA_SET_MARK] = { .type = NLA_U32 }, 2992 [XFRMA_SET_MARK_MASK] = { .type = NLA_U32 }, 2993 [XFRMA_IF_ID] = { .type = NLA_U32 }, 2994 }; 2995 EXPORT_SYMBOL_GPL(xfrma_policy); 2996 2997 static const struct nla_policy xfrma_spd_policy[XFRMA_SPD_MAX+1] = { 2998 [XFRMA_SPD_IPV4_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) }, 2999 [XFRMA_SPD_IPV6_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) }, 3000 }; 3001 3002 static const struct xfrm_link { 3003 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **, 3004 struct netlink_ext_ack *); 3005 int (*start)(struct netlink_callback *); 3006 int (*dump)(struct sk_buff *, struct netlink_callback *); 3007 int (*done)(struct netlink_callback *); 3008 const struct nla_policy *nla_pol; 3009 int nla_max; 3010 } xfrm_dispatch[XFRM_NR_MSGTYPES] = { 3011 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, 3012 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa }, 3013 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa, 3014 .dump = xfrm_dump_sa, 3015 .done = xfrm_dump_sa_done }, 3016 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, 3017 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy }, 3018 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy, 3019 .start = xfrm_dump_policy_start, 3020 .dump = xfrm_dump_policy, 3021 .done = xfrm_dump_policy_done }, 3022 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi }, 3023 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire }, 3024 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire }, 3025 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, 3026 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, 3027 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire}, 3028 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa }, 3029 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy }, 3030 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae }, 3031 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae }, 3032 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate }, 3033 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo }, 3034 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_set_spdinfo, 3035 .nla_pol = xfrma_spd_policy, 3036 .nla_max = XFRMA_SPD_MAX }, 3037 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo }, 3038 [XFRM_MSG_SETDEFAULT - XFRM_MSG_BASE] = { .doit = xfrm_set_default }, 3039 [XFRM_MSG_GETDEFAULT - XFRM_MSG_BASE] = { .doit = xfrm_get_default }, 3040 }; 3041 3042 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, 3043 struct netlink_ext_ack *extack) 3044 { 3045 struct net *net = sock_net(skb->sk); 3046 struct nlattr *attrs[XFRMA_MAX+1]; 3047 const struct xfrm_link *link; 3048 struct nlmsghdr *nlh64 = NULL; 3049 int type, err; 3050 3051 type = nlh->nlmsg_type; 3052 if (type > XFRM_MSG_MAX) 3053 return -EINVAL; 3054 3055 type -= XFRM_MSG_BASE; 3056 link = &xfrm_dispatch[type]; 3057 3058 /* All operations require privileges, even GET */ 3059 if (!netlink_net_capable(skb, CAP_NET_ADMIN)) 3060 return -EPERM; 3061 3062 if (in_compat_syscall()) { 3063 struct xfrm_translator *xtr = xfrm_get_translator(); 3064 3065 if (!xtr) 3066 return -EOPNOTSUPP; 3067 3068 nlh64 = xtr->rcv_msg_compat(nlh, link->nla_max, 3069 link->nla_pol, extack); 3070 xfrm_put_translator(xtr); 3071 if (IS_ERR(nlh64)) 3072 return PTR_ERR(nlh64); 3073 if (nlh64) 3074 nlh = nlh64; 3075 } 3076 3077 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) || 3078 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) && 3079 (nlh->nlmsg_flags & NLM_F_DUMP)) { 3080 struct netlink_dump_control c = { 3081 .start = link->start, 3082 .dump = link->dump, 3083 .done = link->done, 3084 }; 3085 3086 if (link->dump == NULL) { 3087 err = -EINVAL; 3088 goto err; 3089 } 3090 3091 err = netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c); 3092 goto err; 3093 } 3094 3095 err = nlmsg_parse_deprecated(nlh, xfrm_msg_min[type], attrs, 3096 link->nla_max ? : XFRMA_MAX, 3097 link->nla_pol ? : xfrma_policy, extack); 3098 if (err < 0) 3099 goto err; 3100 3101 if (link->doit == NULL) { 3102 err = -EINVAL; 3103 goto err; 3104 } 3105 3106 err = link->doit(skb, nlh, attrs, extack); 3107 3108 /* We need to free skb allocated in xfrm_alloc_compat() before 3109 * returning from this function, because consume_skb() won't take 3110 * care of frag_list since netlink destructor sets 3111 * sbk->head to NULL. (see netlink_skb_destructor()) 3112 */ 3113 if (skb_has_frag_list(skb)) { 3114 kfree_skb(skb_shinfo(skb)->frag_list); 3115 skb_shinfo(skb)->frag_list = NULL; 3116 } 3117 3118 err: 3119 kvfree(nlh64); 3120 return err; 3121 } 3122 3123 static void xfrm_netlink_rcv(struct sk_buff *skb) 3124 { 3125 struct net *net = sock_net(skb->sk); 3126 3127 mutex_lock(&net->xfrm.xfrm_cfg_mutex); 3128 netlink_rcv_skb(skb, &xfrm_user_rcv_msg); 3129 mutex_unlock(&net->xfrm.xfrm_cfg_mutex); 3130 } 3131 3132 static inline unsigned int xfrm_expire_msgsize(void) 3133 { 3134 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire)) 3135 + nla_total_size(sizeof(struct xfrm_mark)); 3136 } 3137 3138 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c) 3139 { 3140 struct xfrm_user_expire *ue; 3141 struct nlmsghdr *nlh; 3142 int err; 3143 3144 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0); 3145 if (nlh == NULL) 3146 return -EMSGSIZE; 3147 3148 ue = nlmsg_data(nlh); 3149 copy_to_user_state(x, &ue->state); 3150 ue->hard = (c->data.hard != 0) ? 1 : 0; 3151 /* clear the padding bytes */ 3152 memset_after(ue, 0, hard); 3153 3154 err = xfrm_mark_put(skb, &x->mark); 3155 if (err) 3156 return err; 3157 3158 err = xfrm_if_id_put(skb, x->if_id); 3159 if (err) 3160 return err; 3161 3162 nlmsg_end(skb, nlh); 3163 return 0; 3164 } 3165 3166 static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c) 3167 { 3168 struct net *net = xs_net(x); 3169 struct sk_buff *skb; 3170 3171 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC); 3172 if (skb == NULL) 3173 return -ENOMEM; 3174 3175 if (build_expire(skb, x, c) < 0) { 3176 kfree_skb(skb); 3177 return -EMSGSIZE; 3178 } 3179 3180 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE); 3181 } 3182 3183 static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c) 3184 { 3185 struct net *net = xs_net(x); 3186 struct sk_buff *skb; 3187 int err; 3188 3189 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC); 3190 if (skb == NULL) 3191 return -ENOMEM; 3192 3193 err = build_aevent(skb, x, c); 3194 BUG_ON(err < 0); 3195 3196 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS); 3197 } 3198 3199 static int xfrm_notify_sa_flush(const struct km_event *c) 3200 { 3201 struct net *net = c->net; 3202 struct xfrm_usersa_flush *p; 3203 struct nlmsghdr *nlh; 3204 struct sk_buff *skb; 3205 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush)); 3206 3207 skb = nlmsg_new(len, GFP_ATOMIC); 3208 if (skb == NULL) 3209 return -ENOMEM; 3210 3211 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0); 3212 if (nlh == NULL) { 3213 kfree_skb(skb); 3214 return -EMSGSIZE; 3215 } 3216 3217 p = nlmsg_data(nlh); 3218 p->proto = c->data.proto; 3219 3220 nlmsg_end(skb, nlh); 3221 3222 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA); 3223 } 3224 3225 static inline unsigned int xfrm_sa_len(struct xfrm_state *x) 3226 { 3227 unsigned int l = 0; 3228 if (x->aead) 3229 l += nla_total_size(aead_len(x->aead)); 3230 if (x->aalg) { 3231 l += nla_total_size(sizeof(struct xfrm_algo) + 3232 (x->aalg->alg_key_len + 7) / 8); 3233 l += nla_total_size(xfrm_alg_auth_len(x->aalg)); 3234 } 3235 if (x->ealg) 3236 l += nla_total_size(xfrm_alg_len(x->ealg)); 3237 if (x->calg) 3238 l += nla_total_size(sizeof(*x->calg)); 3239 if (x->encap) 3240 l += nla_total_size(sizeof(*x->encap)); 3241 if (x->tfcpad) 3242 l += nla_total_size(sizeof(x->tfcpad)); 3243 if (x->replay_esn) 3244 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn)); 3245 else 3246 l += nla_total_size(sizeof(struct xfrm_replay_state)); 3247 if (x->security) 3248 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) + 3249 x->security->ctx_len); 3250 if (x->coaddr) 3251 l += nla_total_size(sizeof(*x->coaddr)); 3252 if (x->props.extra_flags) 3253 l += nla_total_size(sizeof(x->props.extra_flags)); 3254 if (x->xso.dev) 3255 l += nla_total_size(sizeof(struct xfrm_user_offload)); 3256 if (x->props.smark.v | x->props.smark.m) { 3257 l += nla_total_size(sizeof(x->props.smark.v)); 3258 l += nla_total_size(sizeof(x->props.smark.m)); 3259 } 3260 if (x->if_id) 3261 l += nla_total_size(sizeof(x->if_id)); 3262 3263 /* Must count x->lastused as it may become non-zero behind our back. */ 3264 l += nla_total_size_64bit(sizeof(u64)); 3265 3266 if (x->mapping_maxage) 3267 l += nla_total_size(sizeof(x->mapping_maxage)); 3268 3269 return l; 3270 } 3271 3272 static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c) 3273 { 3274 struct net *net = xs_net(x); 3275 struct xfrm_usersa_info *p; 3276 struct xfrm_usersa_id *id; 3277 struct nlmsghdr *nlh; 3278 struct sk_buff *skb; 3279 unsigned int len = xfrm_sa_len(x); 3280 unsigned int headlen; 3281 int err; 3282 3283 headlen = sizeof(*p); 3284 if (c->event == XFRM_MSG_DELSA) { 3285 len += nla_total_size(headlen); 3286 headlen = sizeof(*id); 3287 len += nla_total_size(sizeof(struct xfrm_mark)); 3288 } 3289 len += NLMSG_ALIGN(headlen); 3290 3291 skb = nlmsg_new(len, GFP_ATOMIC); 3292 if (skb == NULL) 3293 return -ENOMEM; 3294 3295 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0); 3296 err = -EMSGSIZE; 3297 if (nlh == NULL) 3298 goto out_free_skb; 3299 3300 p = nlmsg_data(nlh); 3301 if (c->event == XFRM_MSG_DELSA) { 3302 struct nlattr *attr; 3303 3304 id = nlmsg_data(nlh); 3305 memset(id, 0, sizeof(*id)); 3306 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr)); 3307 id->spi = x->id.spi; 3308 id->family = x->props.family; 3309 id->proto = x->id.proto; 3310 3311 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p)); 3312 err = -EMSGSIZE; 3313 if (attr == NULL) 3314 goto out_free_skb; 3315 3316 p = nla_data(attr); 3317 } 3318 err = copy_to_user_state_extra(x, p, skb); 3319 if (err) 3320 goto out_free_skb; 3321 3322 nlmsg_end(skb, nlh); 3323 3324 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA); 3325 3326 out_free_skb: 3327 kfree_skb(skb); 3328 return err; 3329 } 3330 3331 static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c) 3332 { 3333 3334 switch (c->event) { 3335 case XFRM_MSG_EXPIRE: 3336 return xfrm_exp_state_notify(x, c); 3337 case XFRM_MSG_NEWAE: 3338 return xfrm_aevent_state_notify(x, c); 3339 case XFRM_MSG_DELSA: 3340 case XFRM_MSG_UPDSA: 3341 case XFRM_MSG_NEWSA: 3342 return xfrm_notify_sa(x, c); 3343 case XFRM_MSG_FLUSHSA: 3344 return xfrm_notify_sa_flush(c); 3345 default: 3346 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n", 3347 c->event); 3348 break; 3349 } 3350 3351 return 0; 3352 3353 } 3354 3355 static inline unsigned int xfrm_acquire_msgsize(struct xfrm_state *x, 3356 struct xfrm_policy *xp) 3357 { 3358 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire)) 3359 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr) 3360 + nla_total_size(sizeof(struct xfrm_mark)) 3361 + nla_total_size(xfrm_user_sec_ctx_size(x->security)) 3362 + userpolicy_type_attrsize(); 3363 } 3364 3365 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x, 3366 struct xfrm_tmpl *xt, struct xfrm_policy *xp) 3367 { 3368 __u32 seq = xfrm_get_acqseq(); 3369 struct xfrm_user_acquire *ua; 3370 struct nlmsghdr *nlh; 3371 int err; 3372 3373 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0); 3374 if (nlh == NULL) 3375 return -EMSGSIZE; 3376 3377 ua = nlmsg_data(nlh); 3378 memcpy(&ua->id, &x->id, sizeof(ua->id)); 3379 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr)); 3380 memcpy(&ua->sel, &x->sel, sizeof(ua->sel)); 3381 copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT); 3382 ua->aalgos = xt->aalgos; 3383 ua->ealgos = xt->ealgos; 3384 ua->calgos = xt->calgos; 3385 ua->seq = x->km.seq = seq; 3386 3387 err = copy_to_user_tmpl(xp, skb); 3388 if (!err) 3389 err = copy_to_user_state_sec_ctx(x, skb); 3390 if (!err) 3391 err = copy_to_user_policy_type(xp->type, skb); 3392 if (!err) 3393 err = xfrm_mark_put(skb, &xp->mark); 3394 if (!err) 3395 err = xfrm_if_id_put(skb, xp->if_id); 3396 if (!err && xp->xdo.dev) 3397 err = copy_user_offload(&xp->xdo, skb); 3398 if (err) { 3399 nlmsg_cancel(skb, nlh); 3400 return err; 3401 } 3402 3403 nlmsg_end(skb, nlh); 3404 return 0; 3405 } 3406 3407 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt, 3408 struct xfrm_policy *xp) 3409 { 3410 struct net *net = xs_net(x); 3411 struct sk_buff *skb; 3412 int err; 3413 3414 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC); 3415 if (skb == NULL) 3416 return -ENOMEM; 3417 3418 err = build_acquire(skb, x, xt, xp); 3419 BUG_ON(err < 0); 3420 3421 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE); 3422 } 3423 3424 /* User gives us xfrm_user_policy_info followed by an array of 0 3425 * or more templates. 3426 */ 3427 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt, 3428 u8 *data, int len, int *dir) 3429 { 3430 struct net *net = sock_net(sk); 3431 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data; 3432 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1); 3433 struct xfrm_policy *xp; 3434 int nr; 3435 3436 switch (sk->sk_family) { 3437 case AF_INET: 3438 if (opt != IP_XFRM_POLICY) { 3439 *dir = -EOPNOTSUPP; 3440 return NULL; 3441 } 3442 break; 3443 #if IS_ENABLED(CONFIG_IPV6) 3444 case AF_INET6: 3445 if (opt != IPV6_XFRM_POLICY) { 3446 *dir = -EOPNOTSUPP; 3447 return NULL; 3448 } 3449 break; 3450 #endif 3451 default: 3452 *dir = -EINVAL; 3453 return NULL; 3454 } 3455 3456 *dir = -EINVAL; 3457 3458 if (len < sizeof(*p) || 3459 verify_newpolicy_info(p, NULL)) 3460 return NULL; 3461 3462 nr = ((len - sizeof(*p)) / sizeof(*ut)); 3463 if (validate_tmpl(nr, ut, p->sel.family, NULL)) 3464 return NULL; 3465 3466 if (p->dir > XFRM_POLICY_OUT) 3467 return NULL; 3468 3469 xp = xfrm_policy_alloc(net, GFP_ATOMIC); 3470 if (xp == NULL) { 3471 *dir = -ENOBUFS; 3472 return NULL; 3473 } 3474 3475 copy_from_user_policy(xp, p); 3476 xp->type = XFRM_POLICY_TYPE_MAIN; 3477 copy_templates(xp, ut, nr); 3478 3479 *dir = p->dir; 3480 3481 return xp; 3482 } 3483 3484 static inline unsigned int xfrm_polexpire_msgsize(struct xfrm_policy *xp) 3485 { 3486 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire)) 3487 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr) 3488 + nla_total_size(xfrm_user_sec_ctx_size(xp->security)) 3489 + nla_total_size(sizeof(struct xfrm_mark)) 3490 + userpolicy_type_attrsize(); 3491 } 3492 3493 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp, 3494 int dir, const struct km_event *c) 3495 { 3496 struct xfrm_user_polexpire *upe; 3497 int hard = c->data.hard; 3498 struct nlmsghdr *nlh; 3499 int err; 3500 3501 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0); 3502 if (nlh == NULL) 3503 return -EMSGSIZE; 3504 3505 upe = nlmsg_data(nlh); 3506 copy_to_user_policy(xp, &upe->pol, dir); 3507 err = copy_to_user_tmpl(xp, skb); 3508 if (!err) 3509 err = copy_to_user_sec_ctx(xp, skb); 3510 if (!err) 3511 err = copy_to_user_policy_type(xp->type, skb); 3512 if (!err) 3513 err = xfrm_mark_put(skb, &xp->mark); 3514 if (!err) 3515 err = xfrm_if_id_put(skb, xp->if_id); 3516 if (!err && xp->xdo.dev) 3517 err = copy_user_offload(&xp->xdo, skb); 3518 if (err) { 3519 nlmsg_cancel(skb, nlh); 3520 return err; 3521 } 3522 upe->hard = !!hard; 3523 3524 nlmsg_end(skb, nlh); 3525 return 0; 3526 } 3527 3528 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 3529 { 3530 struct net *net = xp_net(xp); 3531 struct sk_buff *skb; 3532 int err; 3533 3534 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC); 3535 if (skb == NULL) 3536 return -ENOMEM; 3537 3538 err = build_polexpire(skb, xp, dir, c); 3539 BUG_ON(err < 0); 3540 3541 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE); 3542 } 3543 3544 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c) 3545 { 3546 unsigned int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr); 3547 struct net *net = xp_net(xp); 3548 struct xfrm_userpolicy_info *p; 3549 struct xfrm_userpolicy_id *id; 3550 struct nlmsghdr *nlh; 3551 struct sk_buff *skb; 3552 unsigned int headlen; 3553 int err; 3554 3555 headlen = sizeof(*p); 3556 if (c->event == XFRM_MSG_DELPOLICY) { 3557 len += nla_total_size(headlen); 3558 headlen = sizeof(*id); 3559 } 3560 len += userpolicy_type_attrsize(); 3561 len += nla_total_size(sizeof(struct xfrm_mark)); 3562 len += NLMSG_ALIGN(headlen); 3563 3564 skb = nlmsg_new(len, GFP_ATOMIC); 3565 if (skb == NULL) 3566 return -ENOMEM; 3567 3568 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0); 3569 err = -EMSGSIZE; 3570 if (nlh == NULL) 3571 goto out_free_skb; 3572 3573 p = nlmsg_data(nlh); 3574 if (c->event == XFRM_MSG_DELPOLICY) { 3575 struct nlattr *attr; 3576 3577 id = nlmsg_data(nlh); 3578 memset(id, 0, sizeof(*id)); 3579 id->dir = dir; 3580 if (c->data.byid) 3581 id->index = xp->index; 3582 else 3583 memcpy(&id->sel, &xp->selector, sizeof(id->sel)); 3584 3585 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p)); 3586 err = -EMSGSIZE; 3587 if (attr == NULL) 3588 goto out_free_skb; 3589 3590 p = nla_data(attr); 3591 } 3592 3593 copy_to_user_policy(xp, p, dir); 3594 err = copy_to_user_tmpl(xp, skb); 3595 if (!err) 3596 err = copy_to_user_policy_type(xp->type, skb); 3597 if (!err) 3598 err = xfrm_mark_put(skb, &xp->mark); 3599 if (!err) 3600 err = xfrm_if_id_put(skb, xp->if_id); 3601 if (!err && xp->xdo.dev) 3602 err = copy_user_offload(&xp->xdo, skb); 3603 if (err) 3604 goto out_free_skb; 3605 3606 nlmsg_end(skb, nlh); 3607 3608 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY); 3609 3610 out_free_skb: 3611 kfree_skb(skb); 3612 return err; 3613 } 3614 3615 static int xfrm_notify_policy_flush(const struct km_event *c) 3616 { 3617 struct net *net = c->net; 3618 struct nlmsghdr *nlh; 3619 struct sk_buff *skb; 3620 int err; 3621 3622 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC); 3623 if (skb == NULL) 3624 return -ENOMEM; 3625 3626 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0); 3627 err = -EMSGSIZE; 3628 if (nlh == NULL) 3629 goto out_free_skb; 3630 err = copy_to_user_policy_type(c->data.type, skb); 3631 if (err) 3632 goto out_free_skb; 3633 3634 nlmsg_end(skb, nlh); 3635 3636 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY); 3637 3638 out_free_skb: 3639 kfree_skb(skb); 3640 return err; 3641 } 3642 3643 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 3644 { 3645 3646 switch (c->event) { 3647 case XFRM_MSG_NEWPOLICY: 3648 case XFRM_MSG_UPDPOLICY: 3649 case XFRM_MSG_DELPOLICY: 3650 return xfrm_notify_policy(xp, dir, c); 3651 case XFRM_MSG_FLUSHPOLICY: 3652 return xfrm_notify_policy_flush(c); 3653 case XFRM_MSG_POLEXPIRE: 3654 return xfrm_exp_policy_notify(xp, dir, c); 3655 default: 3656 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n", 3657 c->event); 3658 } 3659 3660 return 0; 3661 3662 } 3663 3664 static inline unsigned int xfrm_report_msgsize(void) 3665 { 3666 return NLMSG_ALIGN(sizeof(struct xfrm_user_report)); 3667 } 3668 3669 static int build_report(struct sk_buff *skb, u8 proto, 3670 struct xfrm_selector *sel, xfrm_address_t *addr) 3671 { 3672 struct xfrm_user_report *ur; 3673 struct nlmsghdr *nlh; 3674 3675 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0); 3676 if (nlh == NULL) 3677 return -EMSGSIZE; 3678 3679 ur = nlmsg_data(nlh); 3680 ur->proto = proto; 3681 memcpy(&ur->sel, sel, sizeof(ur->sel)); 3682 3683 if (addr) { 3684 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr); 3685 if (err) { 3686 nlmsg_cancel(skb, nlh); 3687 return err; 3688 } 3689 } 3690 nlmsg_end(skb, nlh); 3691 return 0; 3692 } 3693 3694 static int xfrm_send_report(struct net *net, u8 proto, 3695 struct xfrm_selector *sel, xfrm_address_t *addr) 3696 { 3697 struct sk_buff *skb; 3698 int err; 3699 3700 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC); 3701 if (skb == NULL) 3702 return -ENOMEM; 3703 3704 err = build_report(skb, proto, sel, addr); 3705 BUG_ON(err < 0); 3706 3707 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT); 3708 } 3709 3710 static inline unsigned int xfrm_mapping_msgsize(void) 3711 { 3712 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping)); 3713 } 3714 3715 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x, 3716 xfrm_address_t *new_saddr, __be16 new_sport) 3717 { 3718 struct xfrm_user_mapping *um; 3719 struct nlmsghdr *nlh; 3720 3721 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0); 3722 if (nlh == NULL) 3723 return -EMSGSIZE; 3724 3725 um = nlmsg_data(nlh); 3726 3727 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr)); 3728 um->id.spi = x->id.spi; 3729 um->id.family = x->props.family; 3730 um->id.proto = x->id.proto; 3731 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr)); 3732 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr)); 3733 um->new_sport = new_sport; 3734 um->old_sport = x->encap->encap_sport; 3735 um->reqid = x->props.reqid; 3736 3737 nlmsg_end(skb, nlh); 3738 return 0; 3739 } 3740 3741 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, 3742 __be16 sport) 3743 { 3744 struct net *net = xs_net(x); 3745 struct sk_buff *skb; 3746 int err; 3747 3748 if (x->id.proto != IPPROTO_ESP) 3749 return -EINVAL; 3750 3751 if (!x->encap) 3752 return -EINVAL; 3753 3754 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC); 3755 if (skb == NULL) 3756 return -ENOMEM; 3757 3758 err = build_mapping(skb, x, ipaddr, sport); 3759 BUG_ON(err < 0); 3760 3761 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING); 3762 } 3763 3764 static bool xfrm_is_alive(const struct km_event *c) 3765 { 3766 return (bool)xfrm_acquire_is_on(c->net); 3767 } 3768 3769 static struct xfrm_mgr netlink_mgr = { 3770 .notify = xfrm_send_state_notify, 3771 .acquire = xfrm_send_acquire, 3772 .compile_policy = xfrm_compile_policy, 3773 .notify_policy = xfrm_send_policy_notify, 3774 .report = xfrm_send_report, 3775 .migrate = xfrm_send_migrate, 3776 .new_mapping = xfrm_send_mapping, 3777 .is_alive = xfrm_is_alive, 3778 }; 3779 3780 static int __net_init xfrm_user_net_init(struct net *net) 3781 { 3782 struct sock *nlsk; 3783 struct netlink_kernel_cfg cfg = { 3784 .groups = XFRMNLGRP_MAX, 3785 .input = xfrm_netlink_rcv, 3786 }; 3787 3788 nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg); 3789 if (nlsk == NULL) 3790 return -ENOMEM; 3791 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */ 3792 rcu_assign_pointer(net->xfrm.nlsk, nlsk); 3793 return 0; 3794 } 3795 3796 static void __net_exit xfrm_user_net_pre_exit(struct net *net) 3797 { 3798 RCU_INIT_POINTER(net->xfrm.nlsk, NULL); 3799 } 3800 3801 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list) 3802 { 3803 struct net *net; 3804 3805 list_for_each_entry(net, net_exit_list, exit_list) 3806 netlink_kernel_release(net->xfrm.nlsk_stash); 3807 } 3808 3809 static struct pernet_operations xfrm_user_net_ops = { 3810 .init = xfrm_user_net_init, 3811 .pre_exit = xfrm_user_net_pre_exit, 3812 .exit_batch = xfrm_user_net_exit, 3813 }; 3814 3815 static int __init xfrm_user_init(void) 3816 { 3817 int rv; 3818 3819 printk(KERN_INFO "Initializing XFRM netlink socket\n"); 3820 3821 rv = register_pernet_subsys(&xfrm_user_net_ops); 3822 if (rv < 0) 3823 return rv; 3824 xfrm_register_km(&netlink_mgr); 3825 return 0; 3826 } 3827 3828 static void __exit xfrm_user_exit(void) 3829 { 3830 xfrm_unregister_km(&netlink_mgr); 3831 unregister_pernet_subsys(&xfrm_user_net_ops); 3832 } 3833 3834 module_init(xfrm_user_init); 3835 module_exit(xfrm_user_exit); 3836 MODULE_LICENSE("GPL"); 3837 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM); 3838