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 if (x->xso.dev) 905 xfrm_dev_state_update_curlft(x); 906 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft)); 907 put_unaligned(x->stats.replay_window, &p->stats.replay_window); 908 put_unaligned(x->stats.replay, &p->stats.replay); 909 put_unaligned(x->stats.integrity_failed, &p->stats.integrity_failed); 910 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr)); 911 p->mode = x->props.mode; 912 p->replay_window = x->props.replay_window; 913 p->reqid = x->props.reqid; 914 p->family = x->props.family; 915 p->flags = x->props.flags; 916 p->seq = x->km.seq; 917 } 918 919 struct xfrm_dump_info { 920 struct sk_buff *in_skb; 921 struct sk_buff *out_skb; 922 u32 nlmsg_seq; 923 u16 nlmsg_flags; 924 }; 925 926 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb) 927 { 928 struct xfrm_user_sec_ctx *uctx; 929 struct nlattr *attr; 930 int ctx_size = sizeof(*uctx) + s->ctx_len; 931 932 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size); 933 if (attr == NULL) 934 return -EMSGSIZE; 935 936 uctx = nla_data(attr); 937 uctx->exttype = XFRMA_SEC_CTX; 938 uctx->len = ctx_size; 939 uctx->ctx_doi = s->ctx_doi; 940 uctx->ctx_alg = s->ctx_alg; 941 uctx->ctx_len = s->ctx_len; 942 memcpy(uctx + 1, s->ctx_str, s->ctx_len); 943 944 return 0; 945 } 946 947 static int copy_user_offload(struct xfrm_dev_offload *xso, struct sk_buff *skb) 948 { 949 struct xfrm_user_offload *xuo; 950 struct nlattr *attr; 951 952 attr = nla_reserve(skb, XFRMA_OFFLOAD_DEV, sizeof(*xuo)); 953 if (attr == NULL) 954 return -EMSGSIZE; 955 956 xuo = nla_data(attr); 957 memset(xuo, 0, sizeof(*xuo)); 958 xuo->ifindex = xso->dev->ifindex; 959 if (xso->dir == XFRM_DEV_OFFLOAD_IN) 960 xuo->flags = XFRM_OFFLOAD_INBOUND; 961 if (xso->type == XFRM_DEV_OFFLOAD_PACKET) 962 xuo->flags |= XFRM_OFFLOAD_PACKET; 963 964 return 0; 965 } 966 967 static bool xfrm_redact(void) 968 { 969 return IS_ENABLED(CONFIG_SECURITY) && 970 security_locked_down(LOCKDOWN_XFRM_SECRET); 971 } 972 973 static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb) 974 { 975 struct xfrm_algo *algo; 976 struct xfrm_algo_auth *ap; 977 struct nlattr *nla; 978 bool redact_secret = xfrm_redact(); 979 980 nla = nla_reserve(skb, XFRMA_ALG_AUTH, 981 sizeof(*algo) + (auth->alg_key_len + 7) / 8); 982 if (!nla) 983 return -EMSGSIZE; 984 algo = nla_data(nla); 985 strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name)); 986 987 if (redact_secret && auth->alg_key_len) 988 memset(algo->alg_key, 0, (auth->alg_key_len + 7) / 8); 989 else 990 memcpy(algo->alg_key, auth->alg_key, 991 (auth->alg_key_len + 7) / 8); 992 algo->alg_key_len = auth->alg_key_len; 993 994 nla = nla_reserve(skb, XFRMA_ALG_AUTH_TRUNC, xfrm_alg_auth_len(auth)); 995 if (!nla) 996 return -EMSGSIZE; 997 ap = nla_data(nla); 998 memcpy(ap, auth, sizeof(struct xfrm_algo_auth)); 999 if (redact_secret && auth->alg_key_len) 1000 memset(ap->alg_key, 0, (auth->alg_key_len + 7) / 8); 1001 else 1002 memcpy(ap->alg_key, auth->alg_key, 1003 (auth->alg_key_len + 7) / 8); 1004 return 0; 1005 } 1006 1007 static int copy_to_user_aead(struct xfrm_algo_aead *aead, struct sk_buff *skb) 1008 { 1009 struct nlattr *nla = nla_reserve(skb, XFRMA_ALG_AEAD, aead_len(aead)); 1010 struct xfrm_algo_aead *ap; 1011 bool redact_secret = xfrm_redact(); 1012 1013 if (!nla) 1014 return -EMSGSIZE; 1015 1016 ap = nla_data(nla); 1017 strscpy_pad(ap->alg_name, aead->alg_name, sizeof(ap->alg_name)); 1018 ap->alg_key_len = aead->alg_key_len; 1019 ap->alg_icv_len = aead->alg_icv_len; 1020 1021 if (redact_secret && aead->alg_key_len) 1022 memset(ap->alg_key, 0, (aead->alg_key_len + 7) / 8); 1023 else 1024 memcpy(ap->alg_key, aead->alg_key, 1025 (aead->alg_key_len + 7) / 8); 1026 return 0; 1027 } 1028 1029 static int copy_to_user_ealg(struct xfrm_algo *ealg, struct sk_buff *skb) 1030 { 1031 struct xfrm_algo *ap; 1032 bool redact_secret = xfrm_redact(); 1033 struct nlattr *nla = nla_reserve(skb, XFRMA_ALG_CRYPT, 1034 xfrm_alg_len(ealg)); 1035 if (!nla) 1036 return -EMSGSIZE; 1037 1038 ap = nla_data(nla); 1039 strscpy_pad(ap->alg_name, ealg->alg_name, sizeof(ap->alg_name)); 1040 ap->alg_key_len = ealg->alg_key_len; 1041 1042 if (redact_secret && ealg->alg_key_len) 1043 memset(ap->alg_key, 0, (ealg->alg_key_len + 7) / 8); 1044 else 1045 memcpy(ap->alg_key, ealg->alg_key, 1046 (ealg->alg_key_len + 7) / 8); 1047 1048 return 0; 1049 } 1050 1051 static int copy_to_user_calg(struct xfrm_algo *calg, struct sk_buff *skb) 1052 { 1053 struct nlattr *nla = nla_reserve(skb, XFRMA_ALG_COMP, sizeof(*calg)); 1054 struct xfrm_algo *ap; 1055 1056 if (!nla) 1057 return -EMSGSIZE; 1058 1059 ap = nla_data(nla); 1060 strscpy_pad(ap->alg_name, calg->alg_name, sizeof(ap->alg_name)); 1061 ap->alg_key_len = 0; 1062 1063 return 0; 1064 } 1065 1066 static int copy_to_user_encap(struct xfrm_encap_tmpl *ep, struct sk_buff *skb) 1067 { 1068 struct nlattr *nla = nla_reserve(skb, XFRMA_ENCAP, sizeof(*ep)); 1069 struct xfrm_encap_tmpl *uep; 1070 1071 if (!nla) 1072 return -EMSGSIZE; 1073 1074 uep = nla_data(nla); 1075 memset(uep, 0, sizeof(*uep)); 1076 1077 uep->encap_type = ep->encap_type; 1078 uep->encap_sport = ep->encap_sport; 1079 uep->encap_dport = ep->encap_dport; 1080 uep->encap_oa = ep->encap_oa; 1081 1082 return 0; 1083 } 1084 1085 static int xfrm_smark_put(struct sk_buff *skb, struct xfrm_mark *m) 1086 { 1087 int ret = 0; 1088 1089 if (m->v | m->m) { 1090 ret = nla_put_u32(skb, XFRMA_SET_MARK, m->v); 1091 if (!ret) 1092 ret = nla_put_u32(skb, XFRMA_SET_MARK_MASK, m->m); 1093 } 1094 return ret; 1095 } 1096 1097 /* Don't change this without updating xfrm_sa_len! */ 1098 static int copy_to_user_state_extra(struct xfrm_state *x, 1099 struct xfrm_usersa_info *p, 1100 struct sk_buff *skb) 1101 { 1102 int ret = 0; 1103 1104 copy_to_user_state(x, p); 1105 1106 if (x->props.extra_flags) { 1107 ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS, 1108 x->props.extra_flags); 1109 if (ret) 1110 goto out; 1111 } 1112 1113 if (x->coaddr) { 1114 ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr); 1115 if (ret) 1116 goto out; 1117 } 1118 if (x->lastused) { 1119 ret = nla_put_u64_64bit(skb, XFRMA_LASTUSED, x->lastused, 1120 XFRMA_PAD); 1121 if (ret) 1122 goto out; 1123 } 1124 if (x->aead) { 1125 ret = copy_to_user_aead(x->aead, skb); 1126 if (ret) 1127 goto out; 1128 } 1129 if (x->aalg) { 1130 ret = copy_to_user_auth(x->aalg, skb); 1131 if (ret) 1132 goto out; 1133 } 1134 if (x->ealg) { 1135 ret = copy_to_user_ealg(x->ealg, skb); 1136 if (ret) 1137 goto out; 1138 } 1139 if (x->calg) { 1140 ret = copy_to_user_calg(x->calg, skb); 1141 if (ret) 1142 goto out; 1143 } 1144 if (x->encap) { 1145 ret = copy_to_user_encap(x->encap, skb); 1146 if (ret) 1147 goto out; 1148 } 1149 if (x->tfcpad) { 1150 ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad); 1151 if (ret) 1152 goto out; 1153 } 1154 ret = xfrm_mark_put(skb, &x->mark); 1155 if (ret) 1156 goto out; 1157 1158 ret = xfrm_smark_put(skb, &x->props.smark); 1159 if (ret) 1160 goto out; 1161 1162 if (x->replay_esn) 1163 ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL, 1164 xfrm_replay_state_esn_len(x->replay_esn), 1165 x->replay_esn); 1166 else 1167 ret = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), 1168 &x->replay); 1169 if (ret) 1170 goto out; 1171 if(x->xso.dev) 1172 ret = copy_user_offload(&x->xso, skb); 1173 if (ret) 1174 goto out; 1175 if (x->if_id) { 1176 ret = nla_put_u32(skb, XFRMA_IF_ID, x->if_id); 1177 if (ret) 1178 goto out; 1179 } 1180 if (x->security) { 1181 ret = copy_sec_ctx(x->security, skb); 1182 if (ret) 1183 goto out; 1184 } 1185 if (x->mapping_maxage) 1186 ret = nla_put_u32(skb, XFRMA_MTIMER_THRESH, x->mapping_maxage); 1187 out: 1188 return ret; 1189 } 1190 1191 static int dump_one_state(struct xfrm_state *x, int count, void *ptr) 1192 { 1193 struct xfrm_dump_info *sp = ptr; 1194 struct sk_buff *in_skb = sp->in_skb; 1195 struct sk_buff *skb = sp->out_skb; 1196 struct xfrm_translator *xtr; 1197 struct xfrm_usersa_info *p; 1198 struct nlmsghdr *nlh; 1199 int err; 1200 1201 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq, 1202 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags); 1203 if (nlh == NULL) 1204 return -EMSGSIZE; 1205 1206 p = nlmsg_data(nlh); 1207 1208 err = copy_to_user_state_extra(x, p, skb); 1209 if (err) { 1210 nlmsg_cancel(skb, nlh); 1211 return err; 1212 } 1213 nlmsg_end(skb, nlh); 1214 1215 xtr = xfrm_get_translator(); 1216 if (xtr) { 1217 err = xtr->alloc_compat(skb, nlh); 1218 1219 xfrm_put_translator(xtr); 1220 if (err) { 1221 nlmsg_cancel(skb, nlh); 1222 return err; 1223 } 1224 } 1225 1226 return 0; 1227 } 1228 1229 static int xfrm_dump_sa_done(struct netlink_callback *cb) 1230 { 1231 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1]; 1232 struct sock *sk = cb->skb->sk; 1233 struct net *net = sock_net(sk); 1234 1235 if (cb->args[0]) 1236 xfrm_state_walk_done(walk, net); 1237 return 0; 1238 } 1239 1240 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb) 1241 { 1242 struct net *net = sock_net(skb->sk); 1243 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1]; 1244 struct xfrm_dump_info info; 1245 1246 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) > 1247 sizeof(cb->args) - sizeof(cb->args[0])); 1248 1249 info.in_skb = cb->skb; 1250 info.out_skb = skb; 1251 info.nlmsg_seq = cb->nlh->nlmsg_seq; 1252 info.nlmsg_flags = NLM_F_MULTI; 1253 1254 if (!cb->args[0]) { 1255 struct nlattr *attrs[XFRMA_MAX+1]; 1256 struct xfrm_address_filter *filter = NULL; 1257 u8 proto = 0; 1258 int err; 1259 1260 err = nlmsg_parse_deprecated(cb->nlh, 0, attrs, XFRMA_MAX, 1261 xfrma_policy, cb->extack); 1262 if (err < 0) 1263 return err; 1264 1265 if (attrs[XFRMA_ADDRESS_FILTER]) { 1266 filter = kmemdup(nla_data(attrs[XFRMA_ADDRESS_FILTER]), 1267 sizeof(*filter), GFP_KERNEL); 1268 if (filter == NULL) 1269 return -ENOMEM; 1270 } 1271 1272 if (attrs[XFRMA_PROTO]) 1273 proto = nla_get_u8(attrs[XFRMA_PROTO]); 1274 1275 xfrm_state_walk_init(walk, proto, filter); 1276 cb->args[0] = 1; 1277 } 1278 1279 (void) xfrm_state_walk(net, walk, dump_one_state, &info); 1280 1281 return skb->len; 1282 } 1283 1284 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb, 1285 struct xfrm_state *x, u32 seq) 1286 { 1287 struct xfrm_dump_info info; 1288 struct sk_buff *skb; 1289 int err; 1290 1291 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 1292 if (!skb) 1293 return ERR_PTR(-ENOMEM); 1294 1295 info.in_skb = in_skb; 1296 info.out_skb = skb; 1297 info.nlmsg_seq = seq; 1298 info.nlmsg_flags = 0; 1299 1300 err = dump_one_state(x, 0, &info); 1301 if (err) { 1302 kfree_skb(skb); 1303 return ERR_PTR(err); 1304 } 1305 1306 return skb; 1307 } 1308 1309 /* A wrapper for nlmsg_multicast() checking that nlsk is still available. 1310 * Must be called with RCU read lock. 1311 */ 1312 static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb, 1313 u32 pid, unsigned int group) 1314 { 1315 struct sock *nlsk = rcu_dereference(net->xfrm.nlsk); 1316 struct xfrm_translator *xtr; 1317 1318 if (!nlsk) { 1319 kfree_skb(skb); 1320 return -EPIPE; 1321 } 1322 1323 xtr = xfrm_get_translator(); 1324 if (xtr) { 1325 int err = xtr->alloc_compat(skb, nlmsg_hdr(skb)); 1326 1327 xfrm_put_translator(xtr); 1328 if (err) { 1329 kfree_skb(skb); 1330 return err; 1331 } 1332 } 1333 1334 return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC); 1335 } 1336 1337 static inline unsigned int xfrm_spdinfo_msgsize(void) 1338 { 1339 return NLMSG_ALIGN(4) 1340 + nla_total_size(sizeof(struct xfrmu_spdinfo)) 1341 + nla_total_size(sizeof(struct xfrmu_spdhinfo)) 1342 + nla_total_size(sizeof(struct xfrmu_spdhthresh)) 1343 + nla_total_size(sizeof(struct xfrmu_spdhthresh)); 1344 } 1345 1346 static int build_spdinfo(struct sk_buff *skb, struct net *net, 1347 u32 portid, u32 seq, u32 flags) 1348 { 1349 struct xfrmk_spdinfo si; 1350 struct xfrmu_spdinfo spc; 1351 struct xfrmu_spdhinfo sph; 1352 struct xfrmu_spdhthresh spt4, spt6; 1353 struct nlmsghdr *nlh; 1354 int err; 1355 u32 *f; 1356 unsigned lseq; 1357 1358 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0); 1359 if (nlh == NULL) /* shouldn't really happen ... */ 1360 return -EMSGSIZE; 1361 1362 f = nlmsg_data(nlh); 1363 *f = flags; 1364 xfrm_spd_getinfo(net, &si); 1365 spc.incnt = si.incnt; 1366 spc.outcnt = si.outcnt; 1367 spc.fwdcnt = si.fwdcnt; 1368 spc.inscnt = si.inscnt; 1369 spc.outscnt = si.outscnt; 1370 spc.fwdscnt = si.fwdscnt; 1371 sph.spdhcnt = si.spdhcnt; 1372 sph.spdhmcnt = si.spdhmcnt; 1373 1374 do { 1375 lseq = read_seqbegin(&net->xfrm.policy_hthresh.lock); 1376 1377 spt4.lbits = net->xfrm.policy_hthresh.lbits4; 1378 spt4.rbits = net->xfrm.policy_hthresh.rbits4; 1379 spt6.lbits = net->xfrm.policy_hthresh.lbits6; 1380 spt6.rbits = net->xfrm.policy_hthresh.rbits6; 1381 } while (read_seqretry(&net->xfrm.policy_hthresh.lock, lseq)); 1382 1383 err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc); 1384 if (!err) 1385 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph); 1386 if (!err) 1387 err = nla_put(skb, XFRMA_SPD_IPV4_HTHRESH, sizeof(spt4), &spt4); 1388 if (!err) 1389 err = nla_put(skb, XFRMA_SPD_IPV6_HTHRESH, sizeof(spt6), &spt6); 1390 if (err) { 1391 nlmsg_cancel(skb, nlh); 1392 return err; 1393 } 1394 1395 nlmsg_end(skb, nlh); 1396 return 0; 1397 } 1398 1399 static int xfrm_set_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh, 1400 struct nlattr **attrs, 1401 struct netlink_ext_ack *extack) 1402 { 1403 struct net *net = sock_net(skb->sk); 1404 struct xfrmu_spdhthresh *thresh4 = NULL; 1405 struct xfrmu_spdhthresh *thresh6 = NULL; 1406 1407 /* selector prefixlen thresholds to hash policies */ 1408 if (attrs[XFRMA_SPD_IPV4_HTHRESH]) { 1409 struct nlattr *rta = attrs[XFRMA_SPD_IPV4_HTHRESH]; 1410 1411 if (nla_len(rta) < sizeof(*thresh4)) { 1412 NL_SET_ERR_MSG(extack, "Invalid SPD_IPV4_HTHRESH attribute length"); 1413 return -EINVAL; 1414 } 1415 thresh4 = nla_data(rta); 1416 if (thresh4->lbits > 32 || thresh4->rbits > 32) { 1417 NL_SET_ERR_MSG(extack, "Invalid hash threshold (must be <= 32 for IPv4)"); 1418 return -EINVAL; 1419 } 1420 } 1421 if (attrs[XFRMA_SPD_IPV6_HTHRESH]) { 1422 struct nlattr *rta = attrs[XFRMA_SPD_IPV6_HTHRESH]; 1423 1424 if (nla_len(rta) < sizeof(*thresh6)) { 1425 NL_SET_ERR_MSG(extack, "Invalid SPD_IPV6_HTHRESH attribute length"); 1426 return -EINVAL; 1427 } 1428 thresh6 = nla_data(rta); 1429 if (thresh6->lbits > 128 || thresh6->rbits > 128) { 1430 NL_SET_ERR_MSG(extack, "Invalid hash threshold (must be <= 128 for IPv6)"); 1431 return -EINVAL; 1432 } 1433 } 1434 1435 if (thresh4 || thresh6) { 1436 write_seqlock(&net->xfrm.policy_hthresh.lock); 1437 if (thresh4) { 1438 net->xfrm.policy_hthresh.lbits4 = thresh4->lbits; 1439 net->xfrm.policy_hthresh.rbits4 = thresh4->rbits; 1440 } 1441 if (thresh6) { 1442 net->xfrm.policy_hthresh.lbits6 = thresh6->lbits; 1443 net->xfrm.policy_hthresh.rbits6 = thresh6->rbits; 1444 } 1445 write_sequnlock(&net->xfrm.policy_hthresh.lock); 1446 1447 xfrm_policy_hash_rebuild(net); 1448 } 1449 1450 return 0; 1451 } 1452 1453 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh, 1454 struct nlattr **attrs, 1455 struct netlink_ext_ack *extack) 1456 { 1457 struct net *net = sock_net(skb->sk); 1458 struct sk_buff *r_skb; 1459 u32 *flags = nlmsg_data(nlh); 1460 u32 sportid = NETLINK_CB(skb).portid; 1461 u32 seq = nlh->nlmsg_seq; 1462 int err; 1463 1464 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC); 1465 if (r_skb == NULL) 1466 return -ENOMEM; 1467 1468 err = build_spdinfo(r_skb, net, sportid, seq, *flags); 1469 BUG_ON(err < 0); 1470 1471 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid); 1472 } 1473 1474 static inline unsigned int xfrm_sadinfo_msgsize(void) 1475 { 1476 return NLMSG_ALIGN(4) 1477 + nla_total_size(sizeof(struct xfrmu_sadhinfo)) 1478 + nla_total_size(4); /* XFRMA_SAD_CNT */ 1479 } 1480 1481 static int build_sadinfo(struct sk_buff *skb, struct net *net, 1482 u32 portid, u32 seq, u32 flags) 1483 { 1484 struct xfrmk_sadinfo si; 1485 struct xfrmu_sadhinfo sh; 1486 struct nlmsghdr *nlh; 1487 int err; 1488 u32 *f; 1489 1490 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0); 1491 if (nlh == NULL) /* shouldn't really happen ... */ 1492 return -EMSGSIZE; 1493 1494 f = nlmsg_data(nlh); 1495 *f = flags; 1496 xfrm_sad_getinfo(net, &si); 1497 1498 sh.sadhmcnt = si.sadhmcnt; 1499 sh.sadhcnt = si.sadhcnt; 1500 1501 err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt); 1502 if (!err) 1503 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh); 1504 if (err) { 1505 nlmsg_cancel(skb, nlh); 1506 return err; 1507 } 1508 1509 nlmsg_end(skb, nlh); 1510 return 0; 1511 } 1512 1513 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh, 1514 struct nlattr **attrs, 1515 struct netlink_ext_ack *extack) 1516 { 1517 struct net *net = sock_net(skb->sk); 1518 struct sk_buff *r_skb; 1519 u32 *flags = nlmsg_data(nlh); 1520 u32 sportid = NETLINK_CB(skb).portid; 1521 u32 seq = nlh->nlmsg_seq; 1522 int err; 1523 1524 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC); 1525 if (r_skb == NULL) 1526 return -ENOMEM; 1527 1528 err = build_sadinfo(r_skb, net, sportid, seq, *flags); 1529 BUG_ON(err < 0); 1530 1531 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid); 1532 } 1533 1534 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 1535 struct nlattr **attrs, struct netlink_ext_ack *extack) 1536 { 1537 struct net *net = sock_net(skb->sk); 1538 struct xfrm_usersa_id *p = nlmsg_data(nlh); 1539 struct xfrm_state *x; 1540 struct sk_buff *resp_skb; 1541 int err = -ESRCH; 1542 1543 x = xfrm_user_state_lookup(net, p, attrs, &err); 1544 if (x == NULL) 1545 goto out_noput; 1546 1547 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); 1548 if (IS_ERR(resp_skb)) { 1549 err = PTR_ERR(resp_skb); 1550 } else { 1551 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid); 1552 } 1553 xfrm_state_put(x); 1554 out_noput: 1555 return err; 1556 } 1557 1558 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh, 1559 struct nlattr **attrs, 1560 struct netlink_ext_ack *extack) 1561 { 1562 struct net *net = sock_net(skb->sk); 1563 struct xfrm_state *x; 1564 struct xfrm_userspi_info *p; 1565 struct xfrm_translator *xtr; 1566 struct sk_buff *resp_skb; 1567 xfrm_address_t *daddr; 1568 int family; 1569 int err; 1570 u32 mark; 1571 struct xfrm_mark m; 1572 u32 if_id = 0; 1573 1574 p = nlmsg_data(nlh); 1575 err = verify_spi_info(p->info.id.proto, p->min, p->max, extack); 1576 if (err) 1577 goto out_noput; 1578 1579 family = p->info.family; 1580 daddr = &p->info.id.daddr; 1581 1582 x = NULL; 1583 1584 mark = xfrm_mark_get(attrs, &m); 1585 1586 if (attrs[XFRMA_IF_ID]) 1587 if_id = nla_get_u32(attrs[XFRMA_IF_ID]); 1588 1589 if (p->info.seq) { 1590 x = xfrm_find_acq_byseq(net, mark, p->info.seq); 1591 if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) { 1592 xfrm_state_put(x); 1593 x = NULL; 1594 } 1595 } 1596 1597 if (!x) 1598 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid, 1599 if_id, p->info.id.proto, daddr, 1600 &p->info.saddr, 1, 1601 family); 1602 err = -ENOENT; 1603 if (!x) { 1604 NL_SET_ERR_MSG(extack, "Target ACQUIRE not found"); 1605 goto out_noput; 1606 } 1607 1608 err = xfrm_alloc_spi(x, p->min, p->max, extack); 1609 if (err) 1610 goto out; 1611 1612 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); 1613 if (IS_ERR(resp_skb)) { 1614 err = PTR_ERR(resp_skb); 1615 goto out; 1616 } 1617 1618 xtr = xfrm_get_translator(); 1619 if (xtr) { 1620 err = xtr->alloc_compat(skb, nlmsg_hdr(skb)); 1621 1622 xfrm_put_translator(xtr); 1623 if (err) { 1624 kfree_skb(resp_skb); 1625 goto out; 1626 } 1627 } 1628 1629 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid); 1630 1631 out: 1632 xfrm_state_put(x); 1633 out_noput: 1634 return err; 1635 } 1636 1637 static int verify_policy_dir(u8 dir, struct netlink_ext_ack *extack) 1638 { 1639 switch (dir) { 1640 case XFRM_POLICY_IN: 1641 case XFRM_POLICY_OUT: 1642 case XFRM_POLICY_FWD: 1643 break; 1644 1645 default: 1646 NL_SET_ERR_MSG(extack, "Invalid policy direction"); 1647 return -EINVAL; 1648 } 1649 1650 return 0; 1651 } 1652 1653 static int verify_policy_type(u8 type, struct netlink_ext_ack *extack) 1654 { 1655 switch (type) { 1656 case XFRM_POLICY_TYPE_MAIN: 1657 #ifdef CONFIG_XFRM_SUB_POLICY 1658 case XFRM_POLICY_TYPE_SUB: 1659 #endif 1660 break; 1661 1662 default: 1663 NL_SET_ERR_MSG(extack, "Invalid policy type"); 1664 return -EINVAL; 1665 } 1666 1667 return 0; 1668 } 1669 1670 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p, 1671 struct netlink_ext_ack *extack) 1672 { 1673 int ret; 1674 1675 switch (p->share) { 1676 case XFRM_SHARE_ANY: 1677 case XFRM_SHARE_SESSION: 1678 case XFRM_SHARE_USER: 1679 case XFRM_SHARE_UNIQUE: 1680 break; 1681 1682 default: 1683 NL_SET_ERR_MSG(extack, "Invalid policy share"); 1684 return -EINVAL; 1685 } 1686 1687 switch (p->action) { 1688 case XFRM_POLICY_ALLOW: 1689 case XFRM_POLICY_BLOCK: 1690 break; 1691 1692 default: 1693 NL_SET_ERR_MSG(extack, "Invalid policy action"); 1694 return -EINVAL; 1695 } 1696 1697 switch (p->sel.family) { 1698 case AF_INET: 1699 if (p->sel.prefixlen_d > 32 || p->sel.prefixlen_s > 32) { 1700 NL_SET_ERR_MSG(extack, "Invalid prefix length in selector (must be <= 32 for IPv4)"); 1701 return -EINVAL; 1702 } 1703 1704 break; 1705 1706 case AF_INET6: 1707 #if IS_ENABLED(CONFIG_IPV6) 1708 if (p->sel.prefixlen_d > 128 || p->sel.prefixlen_s > 128) { 1709 NL_SET_ERR_MSG(extack, "Invalid prefix length in selector (must be <= 128 for IPv6)"); 1710 return -EINVAL; 1711 } 1712 1713 break; 1714 #else 1715 NL_SET_ERR_MSG(extack, "IPv6 support disabled"); 1716 return -EAFNOSUPPORT; 1717 #endif 1718 1719 default: 1720 NL_SET_ERR_MSG(extack, "Invalid selector family"); 1721 return -EINVAL; 1722 } 1723 1724 ret = verify_policy_dir(p->dir, extack); 1725 if (ret) 1726 return ret; 1727 if (p->index && (xfrm_policy_id2dir(p->index) != p->dir)) { 1728 NL_SET_ERR_MSG(extack, "Policy index doesn't match direction"); 1729 return -EINVAL; 1730 } 1731 1732 return 0; 1733 } 1734 1735 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs) 1736 { 1737 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 1738 struct xfrm_user_sec_ctx *uctx; 1739 1740 if (!rt) 1741 return 0; 1742 1743 uctx = nla_data(rt); 1744 return security_xfrm_policy_alloc(&pol->security, uctx, GFP_KERNEL); 1745 } 1746 1747 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut, 1748 int nr) 1749 { 1750 int i; 1751 1752 xp->xfrm_nr = nr; 1753 for (i = 0; i < nr; i++, ut++) { 1754 struct xfrm_tmpl *t = &xp->xfrm_vec[i]; 1755 1756 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id)); 1757 memcpy(&t->saddr, &ut->saddr, 1758 sizeof(xfrm_address_t)); 1759 t->reqid = ut->reqid; 1760 t->mode = ut->mode; 1761 t->share = ut->share; 1762 t->optional = ut->optional; 1763 t->aalgos = ut->aalgos; 1764 t->ealgos = ut->ealgos; 1765 t->calgos = ut->calgos; 1766 /* If all masks are ~0, then we allow all algorithms. */ 1767 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos); 1768 t->encap_family = ut->family; 1769 } 1770 } 1771 1772 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family, 1773 int dir, struct netlink_ext_ack *extack) 1774 { 1775 u16 prev_family; 1776 int i; 1777 1778 if (nr > XFRM_MAX_DEPTH) { 1779 NL_SET_ERR_MSG(extack, "Template count must be <= XFRM_MAX_DEPTH (" __stringify(XFRM_MAX_DEPTH) ")"); 1780 return -EINVAL; 1781 } 1782 1783 prev_family = family; 1784 1785 for (i = 0; i < nr; i++) { 1786 /* We never validated the ut->family value, so many 1787 * applications simply leave it at zero. The check was 1788 * never made and ut->family was ignored because all 1789 * templates could be assumed to have the same family as 1790 * the policy itself. Now that we will have ipv4-in-ipv6 1791 * and ipv6-in-ipv4 tunnels, this is no longer true. 1792 */ 1793 if (!ut[i].family) 1794 ut[i].family = family; 1795 1796 switch (ut[i].mode) { 1797 case XFRM_MODE_TUNNEL: 1798 case XFRM_MODE_BEET: 1799 if (ut[i].optional && dir == XFRM_POLICY_OUT) { 1800 NL_SET_ERR_MSG(extack, "Mode in optional template not allowed in outbound policy"); 1801 return -EINVAL; 1802 } 1803 break; 1804 default: 1805 if (ut[i].family != prev_family) { 1806 NL_SET_ERR_MSG(extack, "Mode in template doesn't support a family change"); 1807 return -EINVAL; 1808 } 1809 break; 1810 } 1811 if (ut[i].mode >= XFRM_MODE_MAX) { 1812 NL_SET_ERR_MSG(extack, "Mode in template must be < XFRM_MODE_MAX (" __stringify(XFRM_MODE_MAX) ")"); 1813 return -EINVAL; 1814 } 1815 1816 prev_family = ut[i].family; 1817 1818 switch (ut[i].family) { 1819 case AF_INET: 1820 break; 1821 #if IS_ENABLED(CONFIG_IPV6) 1822 case AF_INET6: 1823 break; 1824 #endif 1825 default: 1826 NL_SET_ERR_MSG(extack, "Invalid family in template"); 1827 return -EINVAL; 1828 } 1829 1830 if (!xfrm_id_proto_valid(ut[i].id.proto)) { 1831 NL_SET_ERR_MSG(extack, "Invalid XFRM protocol in template"); 1832 return -EINVAL; 1833 } 1834 } 1835 1836 return 0; 1837 } 1838 1839 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs, 1840 int dir, struct netlink_ext_ack *extack) 1841 { 1842 struct nlattr *rt = attrs[XFRMA_TMPL]; 1843 1844 if (!rt) { 1845 pol->xfrm_nr = 0; 1846 } else { 1847 struct xfrm_user_tmpl *utmpl = nla_data(rt); 1848 int nr = nla_len(rt) / sizeof(*utmpl); 1849 int err; 1850 1851 err = validate_tmpl(nr, utmpl, pol->family, dir, extack); 1852 if (err) 1853 return err; 1854 1855 copy_templates(pol, utmpl, nr); 1856 } 1857 return 0; 1858 } 1859 1860 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs, 1861 struct netlink_ext_ack *extack) 1862 { 1863 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE]; 1864 struct xfrm_userpolicy_type *upt; 1865 u8 type = XFRM_POLICY_TYPE_MAIN; 1866 int err; 1867 1868 if (rt) { 1869 upt = nla_data(rt); 1870 type = upt->type; 1871 } 1872 1873 err = verify_policy_type(type, extack); 1874 if (err) 1875 return err; 1876 1877 *tp = type; 1878 return 0; 1879 } 1880 1881 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p) 1882 { 1883 xp->priority = p->priority; 1884 xp->index = p->index; 1885 memcpy(&xp->selector, &p->sel, sizeof(xp->selector)); 1886 memcpy(&xp->lft, &p->lft, sizeof(xp->lft)); 1887 xp->action = p->action; 1888 xp->flags = p->flags; 1889 xp->family = p->sel.family; 1890 /* XXX xp->share = p->share; */ 1891 } 1892 1893 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir) 1894 { 1895 memset(p, 0, sizeof(*p)); 1896 memcpy(&p->sel, &xp->selector, sizeof(p->sel)); 1897 memcpy(&p->lft, &xp->lft, sizeof(p->lft)); 1898 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft)); 1899 p->priority = xp->priority; 1900 p->index = xp->index; 1901 p->sel.family = xp->family; 1902 p->dir = dir; 1903 p->action = xp->action; 1904 p->flags = xp->flags; 1905 p->share = XFRM_SHARE_ANY; /* XXX xp->share */ 1906 } 1907 1908 static struct xfrm_policy *xfrm_policy_construct(struct net *net, 1909 struct xfrm_userpolicy_info *p, 1910 struct nlattr **attrs, 1911 int *errp, 1912 struct netlink_ext_ack *extack) 1913 { 1914 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL); 1915 int err; 1916 1917 if (!xp) { 1918 *errp = -ENOMEM; 1919 return NULL; 1920 } 1921 1922 copy_from_user_policy(xp, p); 1923 1924 err = copy_from_user_policy_type(&xp->type, attrs, extack); 1925 if (err) 1926 goto error; 1927 1928 if (!(err = copy_from_user_tmpl(xp, attrs, p->dir, extack))) 1929 err = copy_from_user_sec_ctx(xp, attrs); 1930 if (err) 1931 goto error; 1932 1933 xfrm_mark_get(attrs, &xp->mark); 1934 1935 if (attrs[XFRMA_IF_ID]) 1936 xp->if_id = nla_get_u32(attrs[XFRMA_IF_ID]); 1937 1938 /* configure the hardware if offload is requested */ 1939 if (attrs[XFRMA_OFFLOAD_DEV]) { 1940 err = xfrm_dev_policy_add(net, xp, 1941 nla_data(attrs[XFRMA_OFFLOAD_DEV]), 1942 p->dir, extack); 1943 if (err) 1944 goto error; 1945 } 1946 1947 return xp; 1948 error: 1949 *errp = err; 1950 xp->walk.dead = 1; 1951 xfrm_policy_destroy(xp); 1952 return NULL; 1953 } 1954 1955 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 1956 struct nlattr **attrs, 1957 struct netlink_ext_ack *extack) 1958 { 1959 struct net *net = sock_net(skb->sk); 1960 struct xfrm_userpolicy_info *p = nlmsg_data(nlh); 1961 struct xfrm_policy *xp; 1962 struct km_event c; 1963 int err; 1964 int excl; 1965 1966 err = verify_newpolicy_info(p, extack); 1967 if (err) 1968 return err; 1969 err = verify_sec_ctx_len(attrs, extack); 1970 if (err) 1971 return err; 1972 1973 xp = xfrm_policy_construct(net, p, attrs, &err, extack); 1974 if (!xp) 1975 return err; 1976 1977 /* shouldn't excl be based on nlh flags?? 1978 * Aha! this is anti-netlink really i.e more pfkey derived 1979 * in netlink excl is a flag and you wouldn't need 1980 * a type XFRM_MSG_UPDPOLICY - JHS */ 1981 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY; 1982 err = xfrm_policy_insert(p->dir, xp, excl); 1983 xfrm_audit_policy_add(xp, err ? 0 : 1, true); 1984 1985 if (err) { 1986 xfrm_dev_policy_delete(xp); 1987 xfrm_dev_policy_free(xp); 1988 security_xfrm_policy_free(xp->security); 1989 kfree(xp); 1990 return err; 1991 } 1992 1993 c.event = nlh->nlmsg_type; 1994 c.seq = nlh->nlmsg_seq; 1995 c.portid = nlh->nlmsg_pid; 1996 km_policy_notify(xp, p->dir, &c); 1997 1998 xfrm_pol_put(xp); 1999 2000 return 0; 2001 } 2002 2003 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb) 2004 { 2005 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH]; 2006 int i; 2007 2008 if (xp->xfrm_nr == 0) 2009 return 0; 2010 2011 for (i = 0; i < xp->xfrm_nr; i++) { 2012 struct xfrm_user_tmpl *up = &vec[i]; 2013 struct xfrm_tmpl *kp = &xp->xfrm_vec[i]; 2014 2015 memset(up, 0, sizeof(*up)); 2016 memcpy(&up->id, &kp->id, sizeof(up->id)); 2017 up->family = kp->encap_family; 2018 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr)); 2019 up->reqid = kp->reqid; 2020 up->mode = kp->mode; 2021 up->share = kp->share; 2022 up->optional = kp->optional; 2023 up->aalgos = kp->aalgos; 2024 up->ealgos = kp->ealgos; 2025 up->calgos = kp->calgos; 2026 } 2027 2028 return nla_put(skb, XFRMA_TMPL, 2029 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec); 2030 } 2031 2032 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb) 2033 { 2034 if (x->security) { 2035 return copy_sec_ctx(x->security, skb); 2036 } 2037 return 0; 2038 } 2039 2040 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb) 2041 { 2042 if (xp->security) 2043 return copy_sec_ctx(xp->security, skb); 2044 return 0; 2045 } 2046 static inline unsigned int userpolicy_type_attrsize(void) 2047 { 2048 #ifdef CONFIG_XFRM_SUB_POLICY 2049 return nla_total_size(sizeof(struct xfrm_userpolicy_type)); 2050 #else 2051 return 0; 2052 #endif 2053 } 2054 2055 #ifdef CONFIG_XFRM_SUB_POLICY 2056 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb) 2057 { 2058 struct xfrm_userpolicy_type upt; 2059 2060 /* Sadly there are two holes in struct xfrm_userpolicy_type */ 2061 memset(&upt, 0, sizeof(upt)); 2062 upt.type = type; 2063 2064 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt); 2065 } 2066 2067 #else 2068 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb) 2069 { 2070 return 0; 2071 } 2072 #endif 2073 2074 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr) 2075 { 2076 struct xfrm_dump_info *sp = ptr; 2077 struct xfrm_userpolicy_info *p; 2078 struct sk_buff *in_skb = sp->in_skb; 2079 struct sk_buff *skb = sp->out_skb; 2080 struct xfrm_translator *xtr; 2081 struct nlmsghdr *nlh; 2082 int err; 2083 2084 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq, 2085 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags); 2086 if (nlh == NULL) 2087 return -EMSGSIZE; 2088 2089 p = nlmsg_data(nlh); 2090 copy_to_user_policy(xp, p, dir); 2091 err = copy_to_user_tmpl(xp, skb); 2092 if (!err) 2093 err = copy_to_user_sec_ctx(xp, skb); 2094 if (!err) 2095 err = copy_to_user_policy_type(xp->type, skb); 2096 if (!err) 2097 err = xfrm_mark_put(skb, &xp->mark); 2098 if (!err) 2099 err = xfrm_if_id_put(skb, xp->if_id); 2100 if (!err && xp->xdo.dev) 2101 err = copy_user_offload(&xp->xdo, skb); 2102 if (err) { 2103 nlmsg_cancel(skb, nlh); 2104 return err; 2105 } 2106 nlmsg_end(skb, nlh); 2107 2108 xtr = xfrm_get_translator(); 2109 if (xtr) { 2110 err = xtr->alloc_compat(skb, nlh); 2111 2112 xfrm_put_translator(xtr); 2113 if (err) { 2114 nlmsg_cancel(skb, nlh); 2115 return err; 2116 } 2117 } 2118 2119 return 0; 2120 } 2121 2122 static int xfrm_dump_policy_done(struct netlink_callback *cb) 2123 { 2124 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args; 2125 struct net *net = sock_net(cb->skb->sk); 2126 2127 xfrm_policy_walk_done(walk, net); 2128 return 0; 2129 } 2130 2131 static int xfrm_dump_policy_start(struct netlink_callback *cb) 2132 { 2133 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args; 2134 2135 BUILD_BUG_ON(sizeof(*walk) > sizeof(cb->args)); 2136 2137 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY); 2138 return 0; 2139 } 2140 2141 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb) 2142 { 2143 struct net *net = sock_net(skb->sk); 2144 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args; 2145 struct xfrm_dump_info info; 2146 2147 info.in_skb = cb->skb; 2148 info.out_skb = skb; 2149 info.nlmsg_seq = cb->nlh->nlmsg_seq; 2150 info.nlmsg_flags = NLM_F_MULTI; 2151 2152 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info); 2153 2154 return skb->len; 2155 } 2156 2157 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb, 2158 struct xfrm_policy *xp, 2159 int dir, u32 seq) 2160 { 2161 struct xfrm_dump_info info; 2162 struct sk_buff *skb; 2163 int err; 2164 2165 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 2166 if (!skb) 2167 return ERR_PTR(-ENOMEM); 2168 2169 info.in_skb = in_skb; 2170 info.out_skb = skb; 2171 info.nlmsg_seq = seq; 2172 info.nlmsg_flags = 0; 2173 2174 err = dump_one_policy(xp, dir, 0, &info); 2175 if (err) { 2176 kfree_skb(skb); 2177 return ERR_PTR(err); 2178 } 2179 2180 return skb; 2181 } 2182 2183 static int xfrm_notify_userpolicy(struct net *net) 2184 { 2185 struct xfrm_userpolicy_default *up; 2186 int len = NLMSG_ALIGN(sizeof(*up)); 2187 struct nlmsghdr *nlh; 2188 struct sk_buff *skb; 2189 int err; 2190 2191 skb = nlmsg_new(len, GFP_ATOMIC); 2192 if (skb == NULL) 2193 return -ENOMEM; 2194 2195 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_GETDEFAULT, sizeof(*up), 0); 2196 if (nlh == NULL) { 2197 kfree_skb(skb); 2198 return -EMSGSIZE; 2199 } 2200 2201 up = nlmsg_data(nlh); 2202 up->in = net->xfrm.policy_default[XFRM_POLICY_IN]; 2203 up->fwd = net->xfrm.policy_default[XFRM_POLICY_FWD]; 2204 up->out = net->xfrm.policy_default[XFRM_POLICY_OUT]; 2205 2206 nlmsg_end(skb, nlh); 2207 2208 rcu_read_lock(); 2209 err = xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY); 2210 rcu_read_unlock(); 2211 2212 return err; 2213 } 2214 2215 static bool xfrm_userpolicy_is_valid(__u8 policy) 2216 { 2217 return policy == XFRM_USERPOLICY_BLOCK || 2218 policy == XFRM_USERPOLICY_ACCEPT; 2219 } 2220 2221 static int xfrm_set_default(struct sk_buff *skb, struct nlmsghdr *nlh, 2222 struct nlattr **attrs, struct netlink_ext_ack *extack) 2223 { 2224 struct net *net = sock_net(skb->sk); 2225 struct xfrm_userpolicy_default *up = nlmsg_data(nlh); 2226 2227 if (xfrm_userpolicy_is_valid(up->in)) 2228 net->xfrm.policy_default[XFRM_POLICY_IN] = up->in; 2229 2230 if (xfrm_userpolicy_is_valid(up->fwd)) 2231 net->xfrm.policy_default[XFRM_POLICY_FWD] = up->fwd; 2232 2233 if (xfrm_userpolicy_is_valid(up->out)) 2234 net->xfrm.policy_default[XFRM_POLICY_OUT] = up->out; 2235 2236 rt_genid_bump_all(net); 2237 2238 xfrm_notify_userpolicy(net); 2239 return 0; 2240 } 2241 2242 static int xfrm_get_default(struct sk_buff *skb, struct nlmsghdr *nlh, 2243 struct nlattr **attrs, struct netlink_ext_ack *extack) 2244 { 2245 struct sk_buff *r_skb; 2246 struct nlmsghdr *r_nlh; 2247 struct net *net = sock_net(skb->sk); 2248 struct xfrm_userpolicy_default *r_up; 2249 int len = NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_default)); 2250 u32 portid = NETLINK_CB(skb).portid; 2251 u32 seq = nlh->nlmsg_seq; 2252 2253 r_skb = nlmsg_new(len, GFP_ATOMIC); 2254 if (!r_skb) 2255 return -ENOMEM; 2256 2257 r_nlh = nlmsg_put(r_skb, portid, seq, XFRM_MSG_GETDEFAULT, sizeof(*r_up), 0); 2258 if (!r_nlh) { 2259 kfree_skb(r_skb); 2260 return -EMSGSIZE; 2261 } 2262 2263 r_up = nlmsg_data(r_nlh); 2264 r_up->in = net->xfrm.policy_default[XFRM_POLICY_IN]; 2265 r_up->fwd = net->xfrm.policy_default[XFRM_POLICY_FWD]; 2266 r_up->out = net->xfrm.policy_default[XFRM_POLICY_OUT]; 2267 nlmsg_end(r_skb, r_nlh); 2268 2269 return nlmsg_unicast(net->xfrm.nlsk, r_skb, portid); 2270 } 2271 2272 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 2273 struct nlattr **attrs, 2274 struct netlink_ext_ack *extack) 2275 { 2276 struct net *net = sock_net(skb->sk); 2277 struct xfrm_policy *xp; 2278 struct xfrm_userpolicy_id *p; 2279 u8 type = XFRM_POLICY_TYPE_MAIN; 2280 int err; 2281 struct km_event c; 2282 int delete; 2283 struct xfrm_mark m; 2284 u32 if_id = 0; 2285 2286 p = nlmsg_data(nlh); 2287 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY; 2288 2289 err = copy_from_user_policy_type(&type, attrs, extack); 2290 if (err) 2291 return err; 2292 2293 err = verify_policy_dir(p->dir, extack); 2294 if (err) 2295 return err; 2296 2297 if (attrs[XFRMA_IF_ID]) 2298 if_id = nla_get_u32(attrs[XFRMA_IF_ID]); 2299 2300 xfrm_mark_get(attrs, &m); 2301 2302 if (p->index) 2303 xp = xfrm_policy_byid(net, &m, if_id, type, p->dir, 2304 p->index, delete, &err); 2305 else { 2306 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 2307 struct xfrm_sec_ctx *ctx; 2308 2309 err = verify_sec_ctx_len(attrs, extack); 2310 if (err) 2311 return err; 2312 2313 ctx = NULL; 2314 if (rt) { 2315 struct xfrm_user_sec_ctx *uctx = nla_data(rt); 2316 2317 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL); 2318 if (err) 2319 return err; 2320 } 2321 xp = xfrm_policy_bysel_ctx(net, &m, if_id, type, p->dir, 2322 &p->sel, ctx, delete, &err); 2323 security_xfrm_policy_free(ctx); 2324 } 2325 if (xp == NULL) 2326 return -ENOENT; 2327 2328 if (!delete) { 2329 struct sk_buff *resp_skb; 2330 2331 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq); 2332 if (IS_ERR(resp_skb)) { 2333 err = PTR_ERR(resp_skb); 2334 } else { 2335 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, 2336 NETLINK_CB(skb).portid); 2337 } 2338 } else { 2339 xfrm_audit_policy_delete(xp, err ? 0 : 1, true); 2340 2341 if (err != 0) 2342 goto out; 2343 2344 c.data.byid = p->index; 2345 c.event = nlh->nlmsg_type; 2346 c.seq = nlh->nlmsg_seq; 2347 c.portid = nlh->nlmsg_pid; 2348 km_policy_notify(xp, p->dir, &c); 2349 } 2350 2351 out: 2352 xfrm_pol_put(xp); 2353 return err; 2354 } 2355 2356 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 2357 struct nlattr **attrs, 2358 struct netlink_ext_ack *extack) 2359 { 2360 struct net *net = sock_net(skb->sk); 2361 struct km_event c; 2362 struct xfrm_usersa_flush *p = nlmsg_data(nlh); 2363 int err; 2364 2365 err = xfrm_state_flush(net, p->proto, true, false); 2366 if (err) { 2367 if (err == -ESRCH) /* empty table */ 2368 return 0; 2369 return err; 2370 } 2371 c.data.proto = p->proto; 2372 c.event = nlh->nlmsg_type; 2373 c.seq = nlh->nlmsg_seq; 2374 c.portid = nlh->nlmsg_pid; 2375 c.net = net; 2376 km_state_notify(NULL, &c); 2377 2378 return 0; 2379 } 2380 2381 static inline unsigned int xfrm_aevent_msgsize(struct xfrm_state *x) 2382 { 2383 unsigned int replay_size = x->replay_esn ? 2384 xfrm_replay_state_esn_len(x->replay_esn) : 2385 sizeof(struct xfrm_replay_state); 2386 2387 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id)) 2388 + nla_total_size(replay_size) 2389 + nla_total_size_64bit(sizeof(struct xfrm_lifetime_cur)) 2390 + nla_total_size(sizeof(struct xfrm_mark)) 2391 + nla_total_size(4) /* XFRM_AE_RTHR */ 2392 + nla_total_size(4); /* XFRM_AE_ETHR */ 2393 } 2394 2395 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c) 2396 { 2397 struct xfrm_aevent_id *id; 2398 struct nlmsghdr *nlh; 2399 int err; 2400 2401 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0); 2402 if (nlh == NULL) 2403 return -EMSGSIZE; 2404 2405 id = nlmsg_data(nlh); 2406 memset(&id->sa_id, 0, sizeof(id->sa_id)); 2407 memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr)); 2408 id->sa_id.spi = x->id.spi; 2409 id->sa_id.family = x->props.family; 2410 id->sa_id.proto = x->id.proto; 2411 memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr)); 2412 id->reqid = x->props.reqid; 2413 id->flags = c->data.aevent; 2414 2415 if (x->replay_esn) { 2416 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL, 2417 xfrm_replay_state_esn_len(x->replay_esn), 2418 x->replay_esn); 2419 } else { 2420 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), 2421 &x->replay); 2422 } 2423 if (err) 2424 goto out_cancel; 2425 err = nla_put_64bit(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft, 2426 XFRMA_PAD); 2427 if (err) 2428 goto out_cancel; 2429 2430 if (id->flags & XFRM_AE_RTHR) { 2431 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff); 2432 if (err) 2433 goto out_cancel; 2434 } 2435 if (id->flags & XFRM_AE_ETHR) { 2436 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH, 2437 x->replay_maxage * 10 / HZ); 2438 if (err) 2439 goto out_cancel; 2440 } 2441 err = xfrm_mark_put(skb, &x->mark); 2442 if (err) 2443 goto out_cancel; 2444 2445 err = xfrm_if_id_put(skb, x->if_id); 2446 if (err) 2447 goto out_cancel; 2448 2449 nlmsg_end(skb, nlh); 2450 return 0; 2451 2452 out_cancel: 2453 nlmsg_cancel(skb, nlh); 2454 return err; 2455 } 2456 2457 static int xfrm_get_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 sk_buff *r_skb; 2463 int err; 2464 struct km_event c; 2465 u32 mark; 2466 struct xfrm_mark m; 2467 struct xfrm_aevent_id *p = nlmsg_data(nlh); 2468 struct xfrm_usersa_id *id = &p->sa_id; 2469 2470 mark = xfrm_mark_get(attrs, &m); 2471 2472 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family); 2473 if (x == NULL) 2474 return -ESRCH; 2475 2476 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC); 2477 if (r_skb == NULL) { 2478 xfrm_state_put(x); 2479 return -ENOMEM; 2480 } 2481 2482 /* 2483 * XXX: is this lock really needed - none of the other 2484 * gets lock (the concern is things getting updated 2485 * while we are still reading) - jhs 2486 */ 2487 spin_lock_bh(&x->lock); 2488 c.data.aevent = p->flags; 2489 c.seq = nlh->nlmsg_seq; 2490 c.portid = nlh->nlmsg_pid; 2491 2492 err = build_aevent(r_skb, x, &c); 2493 BUG_ON(err < 0); 2494 2495 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid); 2496 spin_unlock_bh(&x->lock); 2497 xfrm_state_put(x); 2498 return err; 2499 } 2500 2501 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh, 2502 struct nlattr **attrs, struct netlink_ext_ack *extack) 2503 { 2504 struct net *net = sock_net(skb->sk); 2505 struct xfrm_state *x; 2506 struct km_event c; 2507 int err = -EINVAL; 2508 u32 mark = 0; 2509 struct xfrm_mark m; 2510 struct xfrm_aevent_id *p = nlmsg_data(nlh); 2511 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL]; 2512 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL]; 2513 struct nlattr *lt = attrs[XFRMA_LTIME_VAL]; 2514 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH]; 2515 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH]; 2516 2517 if (!lt && !rp && !re && !et && !rt) { 2518 NL_SET_ERR_MSG(extack, "Missing required attribute for AE"); 2519 return err; 2520 } 2521 2522 /* pedantic mode - thou shalt sayeth replaceth */ 2523 if (!(nlh->nlmsg_flags & NLM_F_REPLACE)) { 2524 NL_SET_ERR_MSG(extack, "NLM_F_REPLACE flag is required"); 2525 return err; 2526 } 2527 2528 mark = xfrm_mark_get(attrs, &m); 2529 2530 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family); 2531 if (x == NULL) 2532 return -ESRCH; 2533 2534 if (x->km.state != XFRM_STATE_VALID) { 2535 NL_SET_ERR_MSG(extack, "SA must be in VALID state"); 2536 goto out; 2537 } 2538 2539 err = xfrm_replay_verify_len(x->replay_esn, re, extack); 2540 if (err) 2541 goto out; 2542 2543 spin_lock_bh(&x->lock); 2544 xfrm_update_ae_params(x, attrs, 1); 2545 spin_unlock_bh(&x->lock); 2546 2547 c.event = nlh->nlmsg_type; 2548 c.seq = nlh->nlmsg_seq; 2549 c.portid = nlh->nlmsg_pid; 2550 c.data.aevent = XFRM_AE_CU; 2551 km_state_notify(x, &c); 2552 err = 0; 2553 out: 2554 xfrm_state_put(x); 2555 return err; 2556 } 2557 2558 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 2559 struct nlattr **attrs, 2560 struct netlink_ext_ack *extack) 2561 { 2562 struct net *net = sock_net(skb->sk); 2563 struct km_event c; 2564 u8 type = XFRM_POLICY_TYPE_MAIN; 2565 int err; 2566 2567 err = copy_from_user_policy_type(&type, attrs, extack); 2568 if (err) 2569 return err; 2570 2571 err = xfrm_policy_flush(net, type, true); 2572 if (err) { 2573 if (err == -ESRCH) /* empty table */ 2574 return 0; 2575 return err; 2576 } 2577 2578 c.data.type = type; 2579 c.event = nlh->nlmsg_type; 2580 c.seq = nlh->nlmsg_seq; 2581 c.portid = nlh->nlmsg_pid; 2582 c.net = net; 2583 km_policy_notify(NULL, 0, &c); 2584 return 0; 2585 } 2586 2587 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh, 2588 struct nlattr **attrs, 2589 struct netlink_ext_ack *extack) 2590 { 2591 struct net *net = sock_net(skb->sk); 2592 struct xfrm_policy *xp; 2593 struct xfrm_user_polexpire *up = nlmsg_data(nlh); 2594 struct xfrm_userpolicy_info *p = &up->pol; 2595 u8 type = XFRM_POLICY_TYPE_MAIN; 2596 int err = -ENOENT; 2597 struct xfrm_mark m; 2598 u32 if_id = 0; 2599 2600 err = copy_from_user_policy_type(&type, attrs, extack); 2601 if (err) 2602 return err; 2603 2604 err = verify_policy_dir(p->dir, extack); 2605 if (err) 2606 return err; 2607 2608 if (attrs[XFRMA_IF_ID]) 2609 if_id = nla_get_u32(attrs[XFRMA_IF_ID]); 2610 2611 xfrm_mark_get(attrs, &m); 2612 2613 if (p->index) 2614 xp = xfrm_policy_byid(net, &m, if_id, type, p->dir, p->index, 2615 0, &err); 2616 else { 2617 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 2618 struct xfrm_sec_ctx *ctx; 2619 2620 err = verify_sec_ctx_len(attrs, extack); 2621 if (err) 2622 return err; 2623 2624 ctx = NULL; 2625 if (rt) { 2626 struct xfrm_user_sec_ctx *uctx = nla_data(rt); 2627 2628 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL); 2629 if (err) 2630 return err; 2631 } 2632 xp = xfrm_policy_bysel_ctx(net, &m, if_id, type, p->dir, 2633 &p->sel, ctx, 0, &err); 2634 security_xfrm_policy_free(ctx); 2635 } 2636 if (xp == NULL) 2637 return -ENOENT; 2638 2639 if (unlikely(xp->walk.dead)) 2640 goto out; 2641 2642 err = 0; 2643 if (up->hard) { 2644 xfrm_policy_delete(xp, p->dir); 2645 xfrm_audit_policy_delete(xp, 1, true); 2646 } 2647 km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid); 2648 2649 out: 2650 xfrm_pol_put(xp); 2651 return err; 2652 } 2653 2654 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh, 2655 struct nlattr **attrs, 2656 struct netlink_ext_ack *extack) 2657 { 2658 struct net *net = sock_net(skb->sk); 2659 struct xfrm_state *x; 2660 int err; 2661 struct xfrm_user_expire *ue = nlmsg_data(nlh); 2662 struct xfrm_usersa_info *p = &ue->state; 2663 struct xfrm_mark m; 2664 u32 mark = xfrm_mark_get(attrs, &m); 2665 2666 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family); 2667 2668 err = -ENOENT; 2669 if (x == NULL) 2670 return err; 2671 2672 spin_lock_bh(&x->lock); 2673 err = -EINVAL; 2674 if (x->km.state != XFRM_STATE_VALID) { 2675 NL_SET_ERR_MSG(extack, "SA must be in VALID state"); 2676 goto out; 2677 } 2678 2679 km_state_expired(x, ue->hard, nlh->nlmsg_pid); 2680 2681 if (ue->hard) { 2682 __xfrm_state_delete(x); 2683 xfrm_audit_state_delete(x, 1, true); 2684 } 2685 err = 0; 2686 out: 2687 spin_unlock_bh(&x->lock); 2688 xfrm_state_put(x); 2689 return err; 2690 } 2691 2692 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh, 2693 struct nlattr **attrs, 2694 struct netlink_ext_ack *extack) 2695 { 2696 struct net *net = sock_net(skb->sk); 2697 struct xfrm_policy *xp; 2698 struct xfrm_user_tmpl *ut; 2699 int i; 2700 struct nlattr *rt = attrs[XFRMA_TMPL]; 2701 struct xfrm_mark mark; 2702 2703 struct xfrm_user_acquire *ua = nlmsg_data(nlh); 2704 struct xfrm_state *x = xfrm_state_alloc(net); 2705 int err = -ENOMEM; 2706 2707 if (!x) 2708 goto nomem; 2709 2710 xfrm_mark_get(attrs, &mark); 2711 2712 err = verify_newpolicy_info(&ua->policy, extack); 2713 if (err) 2714 goto free_state; 2715 err = verify_sec_ctx_len(attrs, extack); 2716 if (err) 2717 goto free_state; 2718 2719 /* build an XP */ 2720 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err, extack); 2721 if (!xp) 2722 goto free_state; 2723 2724 memcpy(&x->id, &ua->id, sizeof(ua->id)); 2725 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr)); 2726 memcpy(&x->sel, &ua->sel, sizeof(ua->sel)); 2727 xp->mark.m = x->mark.m = mark.m; 2728 xp->mark.v = x->mark.v = mark.v; 2729 ut = nla_data(rt); 2730 /* extract the templates and for each call km_key */ 2731 for (i = 0; i < xp->xfrm_nr; i++, ut++) { 2732 struct xfrm_tmpl *t = &xp->xfrm_vec[i]; 2733 memcpy(&x->id, &t->id, sizeof(x->id)); 2734 x->props.mode = t->mode; 2735 x->props.reqid = t->reqid; 2736 x->props.family = ut->family; 2737 t->aalgos = ua->aalgos; 2738 t->ealgos = ua->ealgos; 2739 t->calgos = ua->calgos; 2740 err = km_query(x, t, xp); 2741 2742 } 2743 2744 xfrm_state_free(x); 2745 kfree(xp); 2746 2747 return 0; 2748 2749 free_state: 2750 xfrm_state_free(x); 2751 nomem: 2752 return err; 2753 } 2754 2755 #ifdef CONFIG_XFRM_MIGRATE 2756 static int copy_from_user_migrate(struct xfrm_migrate *ma, 2757 struct xfrm_kmaddress *k, 2758 struct nlattr **attrs, int *num, 2759 struct netlink_ext_ack *extack) 2760 { 2761 struct nlattr *rt = attrs[XFRMA_MIGRATE]; 2762 struct xfrm_user_migrate *um; 2763 int i, num_migrate; 2764 2765 if (k != NULL) { 2766 struct xfrm_user_kmaddress *uk; 2767 2768 uk = nla_data(attrs[XFRMA_KMADDRESS]); 2769 memcpy(&k->local, &uk->local, sizeof(k->local)); 2770 memcpy(&k->remote, &uk->remote, sizeof(k->remote)); 2771 k->family = uk->family; 2772 k->reserved = uk->reserved; 2773 } 2774 2775 um = nla_data(rt); 2776 num_migrate = nla_len(rt) / sizeof(*um); 2777 2778 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH) { 2779 NL_SET_ERR_MSG(extack, "Invalid number of SAs to migrate, must be 0 < num <= XFRM_MAX_DEPTH (6)"); 2780 return -EINVAL; 2781 } 2782 2783 for (i = 0; i < num_migrate; i++, um++, ma++) { 2784 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr)); 2785 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr)); 2786 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr)); 2787 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr)); 2788 2789 ma->proto = um->proto; 2790 ma->mode = um->mode; 2791 ma->reqid = um->reqid; 2792 2793 ma->old_family = um->old_family; 2794 ma->new_family = um->new_family; 2795 } 2796 2797 *num = i; 2798 return 0; 2799 } 2800 2801 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh, 2802 struct nlattr **attrs, struct netlink_ext_ack *extack) 2803 { 2804 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh); 2805 struct xfrm_migrate m[XFRM_MAX_DEPTH]; 2806 struct xfrm_kmaddress km, *kmp; 2807 u8 type; 2808 int err; 2809 int n = 0; 2810 struct net *net = sock_net(skb->sk); 2811 struct xfrm_encap_tmpl *encap = NULL; 2812 u32 if_id = 0; 2813 2814 if (!attrs[XFRMA_MIGRATE]) { 2815 NL_SET_ERR_MSG(extack, "Missing required MIGRATE attribute"); 2816 return -EINVAL; 2817 } 2818 2819 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL; 2820 2821 err = copy_from_user_policy_type(&type, attrs, extack); 2822 if (err) 2823 return err; 2824 2825 err = copy_from_user_migrate(m, kmp, attrs, &n, extack); 2826 if (err) 2827 return err; 2828 2829 if (!n) 2830 return 0; 2831 2832 if (attrs[XFRMA_ENCAP]) { 2833 encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]), 2834 sizeof(*encap), GFP_KERNEL); 2835 if (!encap) 2836 return -ENOMEM; 2837 } 2838 2839 if (attrs[XFRMA_IF_ID]) 2840 if_id = nla_get_u32(attrs[XFRMA_IF_ID]); 2841 2842 err = xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net, encap, 2843 if_id, extack); 2844 2845 kfree(encap); 2846 2847 return err; 2848 } 2849 #else 2850 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh, 2851 struct nlattr **attrs, struct netlink_ext_ack *extack) 2852 { 2853 return -ENOPROTOOPT; 2854 } 2855 #endif 2856 2857 #ifdef CONFIG_XFRM_MIGRATE 2858 static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb) 2859 { 2860 struct xfrm_user_migrate um; 2861 2862 memset(&um, 0, sizeof(um)); 2863 um.proto = m->proto; 2864 um.mode = m->mode; 2865 um.reqid = m->reqid; 2866 um.old_family = m->old_family; 2867 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr)); 2868 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr)); 2869 um.new_family = m->new_family; 2870 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr)); 2871 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr)); 2872 2873 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um); 2874 } 2875 2876 static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb) 2877 { 2878 struct xfrm_user_kmaddress uk; 2879 2880 memset(&uk, 0, sizeof(uk)); 2881 uk.family = k->family; 2882 uk.reserved = k->reserved; 2883 memcpy(&uk.local, &k->local, sizeof(uk.local)); 2884 memcpy(&uk.remote, &k->remote, sizeof(uk.remote)); 2885 2886 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk); 2887 } 2888 2889 static inline unsigned int xfrm_migrate_msgsize(int num_migrate, int with_kma, 2890 int with_encp) 2891 { 2892 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id)) 2893 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0) 2894 + (with_encp ? nla_total_size(sizeof(struct xfrm_encap_tmpl)) : 0) 2895 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate) 2896 + userpolicy_type_attrsize(); 2897 } 2898 2899 static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m, 2900 int num_migrate, const struct xfrm_kmaddress *k, 2901 const struct xfrm_selector *sel, 2902 const struct xfrm_encap_tmpl *encap, u8 dir, u8 type) 2903 { 2904 const struct xfrm_migrate *mp; 2905 struct xfrm_userpolicy_id *pol_id; 2906 struct nlmsghdr *nlh; 2907 int i, err; 2908 2909 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0); 2910 if (nlh == NULL) 2911 return -EMSGSIZE; 2912 2913 pol_id = nlmsg_data(nlh); 2914 /* copy data from selector, dir, and type to the pol_id */ 2915 memset(pol_id, 0, sizeof(*pol_id)); 2916 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel)); 2917 pol_id->dir = dir; 2918 2919 if (k != NULL) { 2920 err = copy_to_user_kmaddress(k, skb); 2921 if (err) 2922 goto out_cancel; 2923 } 2924 if (encap) { 2925 err = nla_put(skb, XFRMA_ENCAP, sizeof(*encap), encap); 2926 if (err) 2927 goto out_cancel; 2928 } 2929 err = copy_to_user_policy_type(type, skb); 2930 if (err) 2931 goto out_cancel; 2932 for (i = 0, mp = m ; i < num_migrate; i++, mp++) { 2933 err = copy_to_user_migrate(mp, skb); 2934 if (err) 2935 goto out_cancel; 2936 } 2937 2938 nlmsg_end(skb, nlh); 2939 return 0; 2940 2941 out_cancel: 2942 nlmsg_cancel(skb, nlh); 2943 return err; 2944 } 2945 2946 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 2947 const struct xfrm_migrate *m, int num_migrate, 2948 const struct xfrm_kmaddress *k, 2949 const struct xfrm_encap_tmpl *encap) 2950 { 2951 struct net *net = &init_net; 2952 struct sk_buff *skb; 2953 int err; 2954 2955 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k, !!encap), 2956 GFP_ATOMIC); 2957 if (skb == NULL) 2958 return -ENOMEM; 2959 2960 /* build migrate */ 2961 err = build_migrate(skb, m, num_migrate, k, sel, encap, dir, type); 2962 BUG_ON(err < 0); 2963 2964 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE); 2965 } 2966 #else 2967 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 2968 const struct xfrm_migrate *m, int num_migrate, 2969 const struct xfrm_kmaddress *k, 2970 const struct xfrm_encap_tmpl *encap) 2971 { 2972 return -ENOPROTOOPT; 2973 } 2974 #endif 2975 2976 #define XMSGSIZE(type) sizeof(struct type) 2977 2978 const int xfrm_msg_min[XFRM_NR_MSGTYPES] = { 2979 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), 2980 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), 2981 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), 2982 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), 2983 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 2984 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 2985 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info), 2986 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire), 2987 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire), 2988 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), 2989 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), 2990 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire), 2991 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush), 2992 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0, 2993 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), 2994 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), 2995 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report), 2996 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 2997 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32), 2998 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = sizeof(u32), 2999 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32), 3000 [XFRM_MSG_SETDEFAULT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_default), 3001 [XFRM_MSG_GETDEFAULT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_default), 3002 }; 3003 EXPORT_SYMBOL_GPL(xfrm_msg_min); 3004 3005 #undef XMSGSIZE 3006 3007 const struct nla_policy xfrma_policy[XFRMA_MAX+1] = { 3008 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)}, 3009 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)}, 3010 [XFRMA_LASTUSED] = { .type = NLA_U64}, 3011 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)}, 3012 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) }, 3013 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) }, 3014 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) }, 3015 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) }, 3016 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) }, 3017 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) }, 3018 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) }, 3019 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) }, 3020 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) }, 3021 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 }, 3022 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 }, 3023 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) }, 3024 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) }, 3025 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)}, 3026 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) }, 3027 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) }, 3028 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) }, 3029 [XFRMA_TFCPAD] = { .type = NLA_U32 }, 3030 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) }, 3031 [XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 }, 3032 [XFRMA_PROTO] = { .type = NLA_U8 }, 3033 [XFRMA_ADDRESS_FILTER] = { .len = sizeof(struct xfrm_address_filter) }, 3034 [XFRMA_OFFLOAD_DEV] = { .len = sizeof(struct xfrm_user_offload) }, 3035 [XFRMA_SET_MARK] = { .type = NLA_U32 }, 3036 [XFRMA_SET_MARK_MASK] = { .type = NLA_U32 }, 3037 [XFRMA_IF_ID] = { .type = NLA_U32 }, 3038 }; 3039 EXPORT_SYMBOL_GPL(xfrma_policy); 3040 3041 static const struct nla_policy xfrma_spd_policy[XFRMA_SPD_MAX+1] = { 3042 [XFRMA_SPD_IPV4_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) }, 3043 [XFRMA_SPD_IPV6_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) }, 3044 }; 3045 3046 static const struct xfrm_link { 3047 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **, 3048 struct netlink_ext_ack *); 3049 int (*start)(struct netlink_callback *); 3050 int (*dump)(struct sk_buff *, struct netlink_callback *); 3051 int (*done)(struct netlink_callback *); 3052 const struct nla_policy *nla_pol; 3053 int nla_max; 3054 } xfrm_dispatch[XFRM_NR_MSGTYPES] = { 3055 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, 3056 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa }, 3057 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa, 3058 .dump = xfrm_dump_sa, 3059 .done = xfrm_dump_sa_done }, 3060 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, 3061 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy }, 3062 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy, 3063 .start = xfrm_dump_policy_start, 3064 .dump = xfrm_dump_policy, 3065 .done = xfrm_dump_policy_done }, 3066 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi }, 3067 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire }, 3068 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire }, 3069 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, 3070 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, 3071 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire}, 3072 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa }, 3073 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy }, 3074 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae }, 3075 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae }, 3076 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate }, 3077 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo }, 3078 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_set_spdinfo, 3079 .nla_pol = xfrma_spd_policy, 3080 .nla_max = XFRMA_SPD_MAX }, 3081 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo }, 3082 [XFRM_MSG_SETDEFAULT - XFRM_MSG_BASE] = { .doit = xfrm_set_default }, 3083 [XFRM_MSG_GETDEFAULT - XFRM_MSG_BASE] = { .doit = xfrm_get_default }, 3084 }; 3085 3086 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, 3087 struct netlink_ext_ack *extack) 3088 { 3089 struct net *net = sock_net(skb->sk); 3090 struct nlattr *attrs[XFRMA_MAX+1]; 3091 const struct xfrm_link *link; 3092 struct nlmsghdr *nlh64 = NULL; 3093 int type, err; 3094 3095 type = nlh->nlmsg_type; 3096 if (type > XFRM_MSG_MAX) 3097 return -EINVAL; 3098 3099 type -= XFRM_MSG_BASE; 3100 link = &xfrm_dispatch[type]; 3101 3102 /* All operations require privileges, even GET */ 3103 if (!netlink_net_capable(skb, CAP_NET_ADMIN)) 3104 return -EPERM; 3105 3106 if (in_compat_syscall()) { 3107 struct xfrm_translator *xtr = xfrm_get_translator(); 3108 3109 if (!xtr) 3110 return -EOPNOTSUPP; 3111 3112 nlh64 = xtr->rcv_msg_compat(nlh, link->nla_max, 3113 link->nla_pol, extack); 3114 xfrm_put_translator(xtr); 3115 if (IS_ERR(nlh64)) 3116 return PTR_ERR(nlh64); 3117 if (nlh64) 3118 nlh = nlh64; 3119 } 3120 3121 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) || 3122 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) && 3123 (nlh->nlmsg_flags & NLM_F_DUMP)) { 3124 struct netlink_dump_control c = { 3125 .start = link->start, 3126 .dump = link->dump, 3127 .done = link->done, 3128 }; 3129 3130 if (link->dump == NULL) { 3131 err = -EINVAL; 3132 goto err; 3133 } 3134 3135 err = netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c); 3136 goto err; 3137 } 3138 3139 err = nlmsg_parse_deprecated(nlh, xfrm_msg_min[type], attrs, 3140 link->nla_max ? : XFRMA_MAX, 3141 link->nla_pol ? : xfrma_policy, extack); 3142 if (err < 0) 3143 goto err; 3144 3145 if (link->doit == NULL) { 3146 err = -EINVAL; 3147 goto err; 3148 } 3149 3150 err = link->doit(skb, nlh, attrs, extack); 3151 3152 /* We need to free skb allocated in xfrm_alloc_compat() before 3153 * returning from this function, because consume_skb() won't take 3154 * care of frag_list since netlink destructor sets 3155 * sbk->head to NULL. (see netlink_skb_destructor()) 3156 */ 3157 if (skb_has_frag_list(skb)) { 3158 kfree_skb(skb_shinfo(skb)->frag_list); 3159 skb_shinfo(skb)->frag_list = NULL; 3160 } 3161 3162 err: 3163 kvfree(nlh64); 3164 return err; 3165 } 3166 3167 static void xfrm_netlink_rcv(struct sk_buff *skb) 3168 { 3169 struct net *net = sock_net(skb->sk); 3170 3171 mutex_lock(&net->xfrm.xfrm_cfg_mutex); 3172 netlink_rcv_skb(skb, &xfrm_user_rcv_msg); 3173 mutex_unlock(&net->xfrm.xfrm_cfg_mutex); 3174 } 3175 3176 static inline unsigned int xfrm_expire_msgsize(void) 3177 { 3178 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire)) 3179 + nla_total_size(sizeof(struct xfrm_mark)); 3180 } 3181 3182 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c) 3183 { 3184 struct xfrm_user_expire *ue; 3185 struct nlmsghdr *nlh; 3186 int err; 3187 3188 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0); 3189 if (nlh == NULL) 3190 return -EMSGSIZE; 3191 3192 ue = nlmsg_data(nlh); 3193 copy_to_user_state(x, &ue->state); 3194 ue->hard = (c->data.hard != 0) ? 1 : 0; 3195 /* clear the padding bytes */ 3196 memset_after(ue, 0, hard); 3197 3198 err = xfrm_mark_put(skb, &x->mark); 3199 if (err) 3200 return err; 3201 3202 err = xfrm_if_id_put(skb, x->if_id); 3203 if (err) 3204 return err; 3205 3206 nlmsg_end(skb, nlh); 3207 return 0; 3208 } 3209 3210 static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c) 3211 { 3212 struct net *net = xs_net(x); 3213 struct sk_buff *skb; 3214 3215 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC); 3216 if (skb == NULL) 3217 return -ENOMEM; 3218 3219 if (build_expire(skb, x, c) < 0) { 3220 kfree_skb(skb); 3221 return -EMSGSIZE; 3222 } 3223 3224 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE); 3225 } 3226 3227 static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c) 3228 { 3229 struct net *net = xs_net(x); 3230 struct sk_buff *skb; 3231 int err; 3232 3233 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC); 3234 if (skb == NULL) 3235 return -ENOMEM; 3236 3237 err = build_aevent(skb, x, c); 3238 BUG_ON(err < 0); 3239 3240 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS); 3241 } 3242 3243 static int xfrm_notify_sa_flush(const struct km_event *c) 3244 { 3245 struct net *net = c->net; 3246 struct xfrm_usersa_flush *p; 3247 struct nlmsghdr *nlh; 3248 struct sk_buff *skb; 3249 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush)); 3250 3251 skb = nlmsg_new(len, GFP_ATOMIC); 3252 if (skb == NULL) 3253 return -ENOMEM; 3254 3255 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0); 3256 if (nlh == NULL) { 3257 kfree_skb(skb); 3258 return -EMSGSIZE; 3259 } 3260 3261 p = nlmsg_data(nlh); 3262 p->proto = c->data.proto; 3263 3264 nlmsg_end(skb, nlh); 3265 3266 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA); 3267 } 3268 3269 static inline unsigned int xfrm_sa_len(struct xfrm_state *x) 3270 { 3271 unsigned int l = 0; 3272 if (x->aead) 3273 l += nla_total_size(aead_len(x->aead)); 3274 if (x->aalg) { 3275 l += nla_total_size(sizeof(struct xfrm_algo) + 3276 (x->aalg->alg_key_len + 7) / 8); 3277 l += nla_total_size(xfrm_alg_auth_len(x->aalg)); 3278 } 3279 if (x->ealg) 3280 l += nla_total_size(xfrm_alg_len(x->ealg)); 3281 if (x->calg) 3282 l += nla_total_size(sizeof(*x->calg)); 3283 if (x->encap) 3284 l += nla_total_size(sizeof(*x->encap)); 3285 if (x->tfcpad) 3286 l += nla_total_size(sizeof(x->tfcpad)); 3287 if (x->replay_esn) 3288 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn)); 3289 else 3290 l += nla_total_size(sizeof(struct xfrm_replay_state)); 3291 if (x->security) 3292 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) + 3293 x->security->ctx_len); 3294 if (x->coaddr) 3295 l += nla_total_size(sizeof(*x->coaddr)); 3296 if (x->props.extra_flags) 3297 l += nla_total_size(sizeof(x->props.extra_flags)); 3298 if (x->xso.dev) 3299 l += nla_total_size(sizeof(struct xfrm_user_offload)); 3300 if (x->props.smark.v | x->props.smark.m) { 3301 l += nla_total_size(sizeof(x->props.smark.v)); 3302 l += nla_total_size(sizeof(x->props.smark.m)); 3303 } 3304 if (x->if_id) 3305 l += nla_total_size(sizeof(x->if_id)); 3306 3307 /* Must count x->lastused as it may become non-zero behind our back. */ 3308 l += nla_total_size_64bit(sizeof(u64)); 3309 3310 if (x->mapping_maxage) 3311 l += nla_total_size(sizeof(x->mapping_maxage)); 3312 3313 return l; 3314 } 3315 3316 static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c) 3317 { 3318 struct net *net = xs_net(x); 3319 struct xfrm_usersa_info *p; 3320 struct xfrm_usersa_id *id; 3321 struct nlmsghdr *nlh; 3322 struct sk_buff *skb; 3323 unsigned int len = xfrm_sa_len(x); 3324 unsigned int headlen; 3325 int err; 3326 3327 headlen = sizeof(*p); 3328 if (c->event == XFRM_MSG_DELSA) { 3329 len += nla_total_size(headlen); 3330 headlen = sizeof(*id); 3331 len += nla_total_size(sizeof(struct xfrm_mark)); 3332 } 3333 len += NLMSG_ALIGN(headlen); 3334 3335 skb = nlmsg_new(len, GFP_ATOMIC); 3336 if (skb == NULL) 3337 return -ENOMEM; 3338 3339 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0); 3340 err = -EMSGSIZE; 3341 if (nlh == NULL) 3342 goto out_free_skb; 3343 3344 p = nlmsg_data(nlh); 3345 if (c->event == XFRM_MSG_DELSA) { 3346 struct nlattr *attr; 3347 3348 id = nlmsg_data(nlh); 3349 memset(id, 0, sizeof(*id)); 3350 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr)); 3351 id->spi = x->id.spi; 3352 id->family = x->props.family; 3353 id->proto = x->id.proto; 3354 3355 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p)); 3356 err = -EMSGSIZE; 3357 if (attr == NULL) 3358 goto out_free_skb; 3359 3360 p = nla_data(attr); 3361 } 3362 err = copy_to_user_state_extra(x, p, skb); 3363 if (err) 3364 goto out_free_skb; 3365 3366 nlmsg_end(skb, nlh); 3367 3368 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA); 3369 3370 out_free_skb: 3371 kfree_skb(skb); 3372 return err; 3373 } 3374 3375 static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c) 3376 { 3377 3378 switch (c->event) { 3379 case XFRM_MSG_EXPIRE: 3380 return xfrm_exp_state_notify(x, c); 3381 case XFRM_MSG_NEWAE: 3382 return xfrm_aevent_state_notify(x, c); 3383 case XFRM_MSG_DELSA: 3384 case XFRM_MSG_UPDSA: 3385 case XFRM_MSG_NEWSA: 3386 return xfrm_notify_sa(x, c); 3387 case XFRM_MSG_FLUSHSA: 3388 return xfrm_notify_sa_flush(c); 3389 default: 3390 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n", 3391 c->event); 3392 break; 3393 } 3394 3395 return 0; 3396 3397 } 3398 3399 static inline unsigned int xfrm_acquire_msgsize(struct xfrm_state *x, 3400 struct xfrm_policy *xp) 3401 { 3402 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire)) 3403 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr) 3404 + nla_total_size(sizeof(struct xfrm_mark)) 3405 + nla_total_size(xfrm_user_sec_ctx_size(x->security)) 3406 + userpolicy_type_attrsize(); 3407 } 3408 3409 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x, 3410 struct xfrm_tmpl *xt, struct xfrm_policy *xp) 3411 { 3412 __u32 seq = xfrm_get_acqseq(); 3413 struct xfrm_user_acquire *ua; 3414 struct nlmsghdr *nlh; 3415 int err; 3416 3417 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0); 3418 if (nlh == NULL) 3419 return -EMSGSIZE; 3420 3421 ua = nlmsg_data(nlh); 3422 memcpy(&ua->id, &x->id, sizeof(ua->id)); 3423 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr)); 3424 memcpy(&ua->sel, &x->sel, sizeof(ua->sel)); 3425 copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT); 3426 ua->aalgos = xt->aalgos; 3427 ua->ealgos = xt->ealgos; 3428 ua->calgos = xt->calgos; 3429 ua->seq = x->km.seq = seq; 3430 3431 err = copy_to_user_tmpl(xp, skb); 3432 if (!err) 3433 err = copy_to_user_state_sec_ctx(x, skb); 3434 if (!err) 3435 err = copy_to_user_policy_type(xp->type, skb); 3436 if (!err) 3437 err = xfrm_mark_put(skb, &xp->mark); 3438 if (!err) 3439 err = xfrm_if_id_put(skb, xp->if_id); 3440 if (!err && xp->xdo.dev) 3441 err = copy_user_offload(&xp->xdo, skb); 3442 if (err) { 3443 nlmsg_cancel(skb, nlh); 3444 return err; 3445 } 3446 3447 nlmsg_end(skb, nlh); 3448 return 0; 3449 } 3450 3451 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt, 3452 struct xfrm_policy *xp) 3453 { 3454 struct net *net = xs_net(x); 3455 struct sk_buff *skb; 3456 int err; 3457 3458 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC); 3459 if (skb == NULL) 3460 return -ENOMEM; 3461 3462 err = build_acquire(skb, x, xt, xp); 3463 BUG_ON(err < 0); 3464 3465 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE); 3466 } 3467 3468 /* User gives us xfrm_user_policy_info followed by an array of 0 3469 * or more templates. 3470 */ 3471 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt, 3472 u8 *data, int len, int *dir) 3473 { 3474 struct net *net = sock_net(sk); 3475 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data; 3476 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1); 3477 struct xfrm_policy *xp; 3478 int nr; 3479 3480 switch (sk->sk_family) { 3481 case AF_INET: 3482 if (opt != IP_XFRM_POLICY) { 3483 *dir = -EOPNOTSUPP; 3484 return NULL; 3485 } 3486 break; 3487 #if IS_ENABLED(CONFIG_IPV6) 3488 case AF_INET6: 3489 if (opt != IPV6_XFRM_POLICY) { 3490 *dir = -EOPNOTSUPP; 3491 return NULL; 3492 } 3493 break; 3494 #endif 3495 default: 3496 *dir = -EINVAL; 3497 return NULL; 3498 } 3499 3500 *dir = -EINVAL; 3501 3502 if (len < sizeof(*p) || 3503 verify_newpolicy_info(p, NULL)) 3504 return NULL; 3505 3506 nr = ((len - sizeof(*p)) / sizeof(*ut)); 3507 if (validate_tmpl(nr, ut, p->sel.family, p->dir, NULL)) 3508 return NULL; 3509 3510 if (p->dir > XFRM_POLICY_OUT) 3511 return NULL; 3512 3513 xp = xfrm_policy_alloc(net, GFP_ATOMIC); 3514 if (xp == NULL) { 3515 *dir = -ENOBUFS; 3516 return NULL; 3517 } 3518 3519 copy_from_user_policy(xp, p); 3520 xp->type = XFRM_POLICY_TYPE_MAIN; 3521 copy_templates(xp, ut, nr); 3522 3523 *dir = p->dir; 3524 3525 return xp; 3526 } 3527 3528 static inline unsigned int xfrm_polexpire_msgsize(struct xfrm_policy *xp) 3529 { 3530 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire)) 3531 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr) 3532 + nla_total_size(xfrm_user_sec_ctx_size(xp->security)) 3533 + nla_total_size(sizeof(struct xfrm_mark)) 3534 + userpolicy_type_attrsize(); 3535 } 3536 3537 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp, 3538 int dir, const struct km_event *c) 3539 { 3540 struct xfrm_user_polexpire *upe; 3541 int hard = c->data.hard; 3542 struct nlmsghdr *nlh; 3543 int err; 3544 3545 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0); 3546 if (nlh == NULL) 3547 return -EMSGSIZE; 3548 3549 upe = nlmsg_data(nlh); 3550 copy_to_user_policy(xp, &upe->pol, dir); 3551 err = copy_to_user_tmpl(xp, skb); 3552 if (!err) 3553 err = copy_to_user_sec_ctx(xp, skb); 3554 if (!err) 3555 err = copy_to_user_policy_type(xp->type, skb); 3556 if (!err) 3557 err = xfrm_mark_put(skb, &xp->mark); 3558 if (!err) 3559 err = xfrm_if_id_put(skb, xp->if_id); 3560 if (!err && xp->xdo.dev) 3561 err = copy_user_offload(&xp->xdo, skb); 3562 if (err) { 3563 nlmsg_cancel(skb, nlh); 3564 return err; 3565 } 3566 upe->hard = !!hard; 3567 3568 nlmsg_end(skb, nlh); 3569 return 0; 3570 } 3571 3572 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 3573 { 3574 struct net *net = xp_net(xp); 3575 struct sk_buff *skb; 3576 int err; 3577 3578 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC); 3579 if (skb == NULL) 3580 return -ENOMEM; 3581 3582 err = build_polexpire(skb, xp, dir, c); 3583 BUG_ON(err < 0); 3584 3585 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE); 3586 } 3587 3588 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c) 3589 { 3590 unsigned int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr); 3591 struct net *net = xp_net(xp); 3592 struct xfrm_userpolicy_info *p; 3593 struct xfrm_userpolicy_id *id; 3594 struct nlmsghdr *nlh; 3595 struct sk_buff *skb; 3596 unsigned int headlen; 3597 int err; 3598 3599 headlen = sizeof(*p); 3600 if (c->event == XFRM_MSG_DELPOLICY) { 3601 len += nla_total_size(headlen); 3602 headlen = sizeof(*id); 3603 } 3604 len += userpolicy_type_attrsize(); 3605 len += nla_total_size(sizeof(struct xfrm_mark)); 3606 len += NLMSG_ALIGN(headlen); 3607 3608 skb = nlmsg_new(len, GFP_ATOMIC); 3609 if (skb == NULL) 3610 return -ENOMEM; 3611 3612 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0); 3613 err = -EMSGSIZE; 3614 if (nlh == NULL) 3615 goto out_free_skb; 3616 3617 p = nlmsg_data(nlh); 3618 if (c->event == XFRM_MSG_DELPOLICY) { 3619 struct nlattr *attr; 3620 3621 id = nlmsg_data(nlh); 3622 memset(id, 0, sizeof(*id)); 3623 id->dir = dir; 3624 if (c->data.byid) 3625 id->index = xp->index; 3626 else 3627 memcpy(&id->sel, &xp->selector, sizeof(id->sel)); 3628 3629 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p)); 3630 err = -EMSGSIZE; 3631 if (attr == NULL) 3632 goto out_free_skb; 3633 3634 p = nla_data(attr); 3635 } 3636 3637 copy_to_user_policy(xp, p, dir); 3638 err = copy_to_user_tmpl(xp, skb); 3639 if (!err) 3640 err = copy_to_user_policy_type(xp->type, skb); 3641 if (!err) 3642 err = xfrm_mark_put(skb, &xp->mark); 3643 if (!err) 3644 err = xfrm_if_id_put(skb, xp->if_id); 3645 if (!err && xp->xdo.dev) 3646 err = copy_user_offload(&xp->xdo, skb); 3647 if (err) 3648 goto out_free_skb; 3649 3650 nlmsg_end(skb, nlh); 3651 3652 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY); 3653 3654 out_free_skb: 3655 kfree_skb(skb); 3656 return err; 3657 } 3658 3659 static int xfrm_notify_policy_flush(const struct km_event *c) 3660 { 3661 struct net *net = c->net; 3662 struct nlmsghdr *nlh; 3663 struct sk_buff *skb; 3664 int err; 3665 3666 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC); 3667 if (skb == NULL) 3668 return -ENOMEM; 3669 3670 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0); 3671 err = -EMSGSIZE; 3672 if (nlh == NULL) 3673 goto out_free_skb; 3674 err = copy_to_user_policy_type(c->data.type, skb); 3675 if (err) 3676 goto out_free_skb; 3677 3678 nlmsg_end(skb, nlh); 3679 3680 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY); 3681 3682 out_free_skb: 3683 kfree_skb(skb); 3684 return err; 3685 } 3686 3687 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 3688 { 3689 3690 switch (c->event) { 3691 case XFRM_MSG_NEWPOLICY: 3692 case XFRM_MSG_UPDPOLICY: 3693 case XFRM_MSG_DELPOLICY: 3694 return xfrm_notify_policy(xp, dir, c); 3695 case XFRM_MSG_FLUSHPOLICY: 3696 return xfrm_notify_policy_flush(c); 3697 case XFRM_MSG_POLEXPIRE: 3698 return xfrm_exp_policy_notify(xp, dir, c); 3699 default: 3700 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n", 3701 c->event); 3702 } 3703 3704 return 0; 3705 3706 } 3707 3708 static inline unsigned int xfrm_report_msgsize(void) 3709 { 3710 return NLMSG_ALIGN(sizeof(struct xfrm_user_report)); 3711 } 3712 3713 static int build_report(struct sk_buff *skb, u8 proto, 3714 struct xfrm_selector *sel, xfrm_address_t *addr) 3715 { 3716 struct xfrm_user_report *ur; 3717 struct nlmsghdr *nlh; 3718 3719 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0); 3720 if (nlh == NULL) 3721 return -EMSGSIZE; 3722 3723 ur = nlmsg_data(nlh); 3724 ur->proto = proto; 3725 memcpy(&ur->sel, sel, sizeof(ur->sel)); 3726 3727 if (addr) { 3728 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr); 3729 if (err) { 3730 nlmsg_cancel(skb, nlh); 3731 return err; 3732 } 3733 } 3734 nlmsg_end(skb, nlh); 3735 return 0; 3736 } 3737 3738 static int xfrm_send_report(struct net *net, u8 proto, 3739 struct xfrm_selector *sel, xfrm_address_t *addr) 3740 { 3741 struct sk_buff *skb; 3742 int err; 3743 3744 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC); 3745 if (skb == NULL) 3746 return -ENOMEM; 3747 3748 err = build_report(skb, proto, sel, addr); 3749 BUG_ON(err < 0); 3750 3751 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT); 3752 } 3753 3754 static inline unsigned int xfrm_mapping_msgsize(void) 3755 { 3756 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping)); 3757 } 3758 3759 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x, 3760 xfrm_address_t *new_saddr, __be16 new_sport) 3761 { 3762 struct xfrm_user_mapping *um; 3763 struct nlmsghdr *nlh; 3764 3765 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0); 3766 if (nlh == NULL) 3767 return -EMSGSIZE; 3768 3769 um = nlmsg_data(nlh); 3770 3771 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr)); 3772 um->id.spi = x->id.spi; 3773 um->id.family = x->props.family; 3774 um->id.proto = x->id.proto; 3775 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr)); 3776 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr)); 3777 um->new_sport = new_sport; 3778 um->old_sport = x->encap->encap_sport; 3779 um->reqid = x->props.reqid; 3780 3781 nlmsg_end(skb, nlh); 3782 return 0; 3783 } 3784 3785 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, 3786 __be16 sport) 3787 { 3788 struct net *net = xs_net(x); 3789 struct sk_buff *skb; 3790 int err; 3791 3792 if (x->id.proto != IPPROTO_ESP) 3793 return -EINVAL; 3794 3795 if (!x->encap) 3796 return -EINVAL; 3797 3798 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC); 3799 if (skb == NULL) 3800 return -ENOMEM; 3801 3802 err = build_mapping(skb, x, ipaddr, sport); 3803 BUG_ON(err < 0); 3804 3805 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING); 3806 } 3807 3808 static bool xfrm_is_alive(const struct km_event *c) 3809 { 3810 return (bool)xfrm_acquire_is_on(c->net); 3811 } 3812 3813 static struct xfrm_mgr netlink_mgr = { 3814 .notify = xfrm_send_state_notify, 3815 .acquire = xfrm_send_acquire, 3816 .compile_policy = xfrm_compile_policy, 3817 .notify_policy = xfrm_send_policy_notify, 3818 .report = xfrm_send_report, 3819 .migrate = xfrm_send_migrate, 3820 .new_mapping = xfrm_send_mapping, 3821 .is_alive = xfrm_is_alive, 3822 }; 3823 3824 static int __net_init xfrm_user_net_init(struct net *net) 3825 { 3826 struct sock *nlsk; 3827 struct netlink_kernel_cfg cfg = { 3828 .groups = XFRMNLGRP_MAX, 3829 .input = xfrm_netlink_rcv, 3830 }; 3831 3832 nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg); 3833 if (nlsk == NULL) 3834 return -ENOMEM; 3835 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */ 3836 rcu_assign_pointer(net->xfrm.nlsk, nlsk); 3837 return 0; 3838 } 3839 3840 static void __net_exit xfrm_user_net_pre_exit(struct net *net) 3841 { 3842 RCU_INIT_POINTER(net->xfrm.nlsk, NULL); 3843 } 3844 3845 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list) 3846 { 3847 struct net *net; 3848 3849 list_for_each_entry(net, net_exit_list, exit_list) 3850 netlink_kernel_release(net->xfrm.nlsk_stash); 3851 } 3852 3853 static struct pernet_operations xfrm_user_net_ops = { 3854 .init = xfrm_user_net_init, 3855 .pre_exit = xfrm_user_net_pre_exit, 3856 .exit_batch = xfrm_user_net_exit, 3857 }; 3858 3859 static int __init xfrm_user_init(void) 3860 { 3861 int rv; 3862 3863 printk(KERN_INFO "Initializing XFRM netlink socket\n"); 3864 3865 rv = register_pernet_subsys(&xfrm_user_net_ops); 3866 if (rv < 0) 3867 return rv; 3868 xfrm_register_km(&netlink_mgr); 3869 return 0; 3870 } 3871 3872 static void __exit xfrm_user_exit(void) 3873 { 3874 xfrm_unregister_km(&netlink_mgr); 3875 unregister_pernet_subsys(&xfrm_user_net_ops); 3876 } 3877 3878 module_init(xfrm_user_init); 3879 module_exit(xfrm_user_exit); 3880 MODULE_LICENSE("GPL"); 3881 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM); 3882