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