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 int dir, 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 if (ut[i].optional && dir == XFRM_POLICY_OUT) { 1798 NL_SET_ERR_MSG(extack, "Mode in optional template not allowed in outbound policy"); 1799 return -EINVAL; 1800 } 1801 break; 1802 default: 1803 if (ut[i].family != prev_family) { 1804 NL_SET_ERR_MSG(extack, "Mode in template doesn't support a family change"); 1805 return -EINVAL; 1806 } 1807 break; 1808 } 1809 if (ut[i].mode >= XFRM_MODE_MAX) { 1810 NL_SET_ERR_MSG(extack, "Mode in template must be < XFRM_MODE_MAX (" __stringify(XFRM_MODE_MAX) ")"); 1811 return -EINVAL; 1812 } 1813 1814 prev_family = ut[i].family; 1815 1816 switch (ut[i].family) { 1817 case AF_INET: 1818 break; 1819 #if IS_ENABLED(CONFIG_IPV6) 1820 case AF_INET6: 1821 break; 1822 #endif 1823 default: 1824 NL_SET_ERR_MSG(extack, "Invalid family in template"); 1825 return -EINVAL; 1826 } 1827 1828 if (!xfrm_id_proto_valid(ut[i].id.proto)) { 1829 NL_SET_ERR_MSG(extack, "Invalid XFRM protocol in template"); 1830 return -EINVAL; 1831 } 1832 } 1833 1834 return 0; 1835 } 1836 1837 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs, 1838 int dir, struct netlink_ext_ack *extack) 1839 { 1840 struct nlattr *rt = attrs[XFRMA_TMPL]; 1841 1842 if (!rt) { 1843 pol->xfrm_nr = 0; 1844 } else { 1845 struct xfrm_user_tmpl *utmpl = nla_data(rt); 1846 int nr = nla_len(rt) / sizeof(*utmpl); 1847 int err; 1848 1849 err = validate_tmpl(nr, utmpl, pol->family, dir, extack); 1850 if (err) 1851 return err; 1852 1853 copy_templates(pol, utmpl, nr); 1854 } 1855 return 0; 1856 } 1857 1858 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs, 1859 struct netlink_ext_ack *extack) 1860 { 1861 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE]; 1862 struct xfrm_userpolicy_type *upt; 1863 u8 type = XFRM_POLICY_TYPE_MAIN; 1864 int err; 1865 1866 if (rt) { 1867 upt = nla_data(rt); 1868 type = upt->type; 1869 } 1870 1871 err = verify_policy_type(type, extack); 1872 if (err) 1873 return err; 1874 1875 *tp = type; 1876 return 0; 1877 } 1878 1879 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p) 1880 { 1881 xp->priority = p->priority; 1882 xp->index = p->index; 1883 memcpy(&xp->selector, &p->sel, sizeof(xp->selector)); 1884 memcpy(&xp->lft, &p->lft, sizeof(xp->lft)); 1885 xp->action = p->action; 1886 xp->flags = p->flags; 1887 xp->family = p->sel.family; 1888 /* XXX xp->share = p->share; */ 1889 } 1890 1891 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir) 1892 { 1893 memset(p, 0, sizeof(*p)); 1894 memcpy(&p->sel, &xp->selector, sizeof(p->sel)); 1895 memcpy(&p->lft, &xp->lft, sizeof(p->lft)); 1896 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft)); 1897 p->priority = xp->priority; 1898 p->index = xp->index; 1899 p->sel.family = xp->family; 1900 p->dir = dir; 1901 p->action = xp->action; 1902 p->flags = xp->flags; 1903 p->share = XFRM_SHARE_ANY; /* XXX xp->share */ 1904 } 1905 1906 static struct xfrm_policy *xfrm_policy_construct(struct net *net, 1907 struct xfrm_userpolicy_info *p, 1908 struct nlattr **attrs, 1909 int *errp, 1910 struct netlink_ext_ack *extack) 1911 { 1912 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL); 1913 int err; 1914 1915 if (!xp) { 1916 *errp = -ENOMEM; 1917 return NULL; 1918 } 1919 1920 copy_from_user_policy(xp, p); 1921 1922 err = copy_from_user_policy_type(&xp->type, attrs, extack); 1923 if (err) 1924 goto error; 1925 1926 if (!(err = copy_from_user_tmpl(xp, attrs, p->dir, extack))) 1927 err = copy_from_user_sec_ctx(xp, attrs); 1928 if (err) 1929 goto error; 1930 1931 xfrm_mark_get(attrs, &xp->mark); 1932 1933 if (attrs[XFRMA_IF_ID]) 1934 xp->if_id = nla_get_u32(attrs[XFRMA_IF_ID]); 1935 1936 /* configure the hardware if offload is requested */ 1937 if (attrs[XFRMA_OFFLOAD_DEV]) { 1938 err = xfrm_dev_policy_add(net, xp, 1939 nla_data(attrs[XFRMA_OFFLOAD_DEV]), 1940 p->dir, extack); 1941 if (err) 1942 goto error; 1943 } 1944 1945 return xp; 1946 error: 1947 *errp = err; 1948 xp->walk.dead = 1; 1949 xfrm_policy_destroy(xp); 1950 return NULL; 1951 } 1952 1953 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 1954 struct nlattr **attrs, 1955 struct netlink_ext_ack *extack) 1956 { 1957 struct net *net = sock_net(skb->sk); 1958 struct xfrm_userpolicy_info *p = nlmsg_data(nlh); 1959 struct xfrm_policy *xp; 1960 struct km_event c; 1961 int err; 1962 int excl; 1963 1964 err = verify_newpolicy_info(p, extack); 1965 if (err) 1966 return err; 1967 err = verify_sec_ctx_len(attrs, extack); 1968 if (err) 1969 return err; 1970 1971 xp = xfrm_policy_construct(net, p, attrs, &err, extack); 1972 if (!xp) 1973 return err; 1974 1975 /* shouldn't excl be based on nlh flags?? 1976 * Aha! this is anti-netlink really i.e more pfkey derived 1977 * in netlink excl is a flag and you wouldn't need 1978 * a type XFRM_MSG_UPDPOLICY - JHS */ 1979 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY; 1980 err = xfrm_policy_insert(p->dir, xp, excl); 1981 xfrm_audit_policy_add(xp, err ? 0 : 1, true); 1982 1983 if (err) { 1984 xfrm_dev_policy_delete(xp); 1985 xfrm_dev_policy_free(xp); 1986 security_xfrm_policy_free(xp->security); 1987 kfree(xp); 1988 return err; 1989 } 1990 1991 c.event = nlh->nlmsg_type; 1992 c.seq = nlh->nlmsg_seq; 1993 c.portid = nlh->nlmsg_pid; 1994 km_policy_notify(xp, p->dir, &c); 1995 1996 xfrm_pol_put(xp); 1997 1998 return 0; 1999 } 2000 2001 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb) 2002 { 2003 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH]; 2004 int i; 2005 2006 if (xp->xfrm_nr == 0) 2007 return 0; 2008 2009 for (i = 0; i < xp->xfrm_nr; i++) { 2010 struct xfrm_user_tmpl *up = &vec[i]; 2011 struct xfrm_tmpl *kp = &xp->xfrm_vec[i]; 2012 2013 memset(up, 0, sizeof(*up)); 2014 memcpy(&up->id, &kp->id, sizeof(up->id)); 2015 up->family = kp->encap_family; 2016 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr)); 2017 up->reqid = kp->reqid; 2018 up->mode = kp->mode; 2019 up->share = kp->share; 2020 up->optional = kp->optional; 2021 up->aalgos = kp->aalgos; 2022 up->ealgos = kp->ealgos; 2023 up->calgos = kp->calgos; 2024 } 2025 2026 return nla_put(skb, XFRMA_TMPL, 2027 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec); 2028 } 2029 2030 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb) 2031 { 2032 if (x->security) { 2033 return copy_sec_ctx(x->security, skb); 2034 } 2035 return 0; 2036 } 2037 2038 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb) 2039 { 2040 if (xp->security) 2041 return copy_sec_ctx(xp->security, skb); 2042 return 0; 2043 } 2044 static inline unsigned int userpolicy_type_attrsize(void) 2045 { 2046 #ifdef CONFIG_XFRM_SUB_POLICY 2047 return nla_total_size(sizeof(struct xfrm_userpolicy_type)); 2048 #else 2049 return 0; 2050 #endif 2051 } 2052 2053 #ifdef CONFIG_XFRM_SUB_POLICY 2054 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb) 2055 { 2056 struct xfrm_userpolicy_type upt; 2057 2058 /* Sadly there are two holes in struct xfrm_userpolicy_type */ 2059 memset(&upt, 0, sizeof(upt)); 2060 upt.type = type; 2061 2062 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt); 2063 } 2064 2065 #else 2066 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb) 2067 { 2068 return 0; 2069 } 2070 #endif 2071 2072 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr) 2073 { 2074 struct xfrm_dump_info *sp = ptr; 2075 struct xfrm_userpolicy_info *p; 2076 struct sk_buff *in_skb = sp->in_skb; 2077 struct sk_buff *skb = sp->out_skb; 2078 struct xfrm_translator *xtr; 2079 struct nlmsghdr *nlh; 2080 int err; 2081 2082 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq, 2083 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags); 2084 if (nlh == NULL) 2085 return -EMSGSIZE; 2086 2087 p = nlmsg_data(nlh); 2088 copy_to_user_policy(xp, p, dir); 2089 err = copy_to_user_tmpl(xp, skb); 2090 if (!err) 2091 err = copy_to_user_sec_ctx(xp, skb); 2092 if (!err) 2093 err = copy_to_user_policy_type(xp->type, skb); 2094 if (!err) 2095 err = xfrm_mark_put(skb, &xp->mark); 2096 if (!err) 2097 err = xfrm_if_id_put(skb, xp->if_id); 2098 if (!err && xp->xdo.dev) 2099 err = copy_user_offload(&xp->xdo, skb); 2100 if (err) { 2101 nlmsg_cancel(skb, nlh); 2102 return err; 2103 } 2104 nlmsg_end(skb, nlh); 2105 2106 xtr = xfrm_get_translator(); 2107 if (xtr) { 2108 err = xtr->alloc_compat(skb, nlh); 2109 2110 xfrm_put_translator(xtr); 2111 if (err) { 2112 nlmsg_cancel(skb, nlh); 2113 return err; 2114 } 2115 } 2116 2117 return 0; 2118 } 2119 2120 static int xfrm_dump_policy_done(struct netlink_callback *cb) 2121 { 2122 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args; 2123 struct net *net = sock_net(cb->skb->sk); 2124 2125 xfrm_policy_walk_done(walk, net); 2126 return 0; 2127 } 2128 2129 static int xfrm_dump_policy_start(struct netlink_callback *cb) 2130 { 2131 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args; 2132 2133 BUILD_BUG_ON(sizeof(*walk) > sizeof(cb->args)); 2134 2135 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY); 2136 return 0; 2137 } 2138 2139 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb) 2140 { 2141 struct net *net = sock_net(skb->sk); 2142 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args; 2143 struct xfrm_dump_info info; 2144 2145 info.in_skb = cb->skb; 2146 info.out_skb = skb; 2147 info.nlmsg_seq = cb->nlh->nlmsg_seq; 2148 info.nlmsg_flags = NLM_F_MULTI; 2149 2150 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info); 2151 2152 return skb->len; 2153 } 2154 2155 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb, 2156 struct xfrm_policy *xp, 2157 int dir, u32 seq) 2158 { 2159 struct xfrm_dump_info info; 2160 struct sk_buff *skb; 2161 int err; 2162 2163 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 2164 if (!skb) 2165 return ERR_PTR(-ENOMEM); 2166 2167 info.in_skb = in_skb; 2168 info.out_skb = skb; 2169 info.nlmsg_seq = seq; 2170 info.nlmsg_flags = 0; 2171 2172 err = dump_one_policy(xp, dir, 0, &info); 2173 if (err) { 2174 kfree_skb(skb); 2175 return ERR_PTR(err); 2176 } 2177 2178 return skb; 2179 } 2180 2181 static int xfrm_notify_userpolicy(struct net *net) 2182 { 2183 struct xfrm_userpolicy_default *up; 2184 int len = NLMSG_ALIGN(sizeof(*up)); 2185 struct nlmsghdr *nlh; 2186 struct sk_buff *skb; 2187 int err; 2188 2189 skb = nlmsg_new(len, GFP_ATOMIC); 2190 if (skb == NULL) 2191 return -ENOMEM; 2192 2193 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_GETDEFAULT, sizeof(*up), 0); 2194 if (nlh == NULL) { 2195 kfree_skb(skb); 2196 return -EMSGSIZE; 2197 } 2198 2199 up = nlmsg_data(nlh); 2200 up->in = net->xfrm.policy_default[XFRM_POLICY_IN]; 2201 up->fwd = net->xfrm.policy_default[XFRM_POLICY_FWD]; 2202 up->out = net->xfrm.policy_default[XFRM_POLICY_OUT]; 2203 2204 nlmsg_end(skb, nlh); 2205 2206 rcu_read_lock(); 2207 err = xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY); 2208 rcu_read_unlock(); 2209 2210 return err; 2211 } 2212 2213 static bool xfrm_userpolicy_is_valid(__u8 policy) 2214 { 2215 return policy == XFRM_USERPOLICY_BLOCK || 2216 policy == XFRM_USERPOLICY_ACCEPT; 2217 } 2218 2219 static int xfrm_set_default(struct sk_buff *skb, struct nlmsghdr *nlh, 2220 struct nlattr **attrs, struct netlink_ext_ack *extack) 2221 { 2222 struct net *net = sock_net(skb->sk); 2223 struct xfrm_userpolicy_default *up = nlmsg_data(nlh); 2224 2225 if (xfrm_userpolicy_is_valid(up->in)) 2226 net->xfrm.policy_default[XFRM_POLICY_IN] = up->in; 2227 2228 if (xfrm_userpolicy_is_valid(up->fwd)) 2229 net->xfrm.policy_default[XFRM_POLICY_FWD] = up->fwd; 2230 2231 if (xfrm_userpolicy_is_valid(up->out)) 2232 net->xfrm.policy_default[XFRM_POLICY_OUT] = up->out; 2233 2234 rt_genid_bump_all(net); 2235 2236 xfrm_notify_userpolicy(net); 2237 return 0; 2238 } 2239 2240 static int xfrm_get_default(struct sk_buff *skb, struct nlmsghdr *nlh, 2241 struct nlattr **attrs, struct netlink_ext_ack *extack) 2242 { 2243 struct sk_buff *r_skb; 2244 struct nlmsghdr *r_nlh; 2245 struct net *net = sock_net(skb->sk); 2246 struct xfrm_userpolicy_default *r_up; 2247 int len = NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_default)); 2248 u32 portid = NETLINK_CB(skb).portid; 2249 u32 seq = nlh->nlmsg_seq; 2250 2251 r_skb = nlmsg_new(len, GFP_ATOMIC); 2252 if (!r_skb) 2253 return -ENOMEM; 2254 2255 r_nlh = nlmsg_put(r_skb, portid, seq, XFRM_MSG_GETDEFAULT, sizeof(*r_up), 0); 2256 if (!r_nlh) { 2257 kfree_skb(r_skb); 2258 return -EMSGSIZE; 2259 } 2260 2261 r_up = nlmsg_data(r_nlh); 2262 r_up->in = net->xfrm.policy_default[XFRM_POLICY_IN]; 2263 r_up->fwd = net->xfrm.policy_default[XFRM_POLICY_FWD]; 2264 r_up->out = net->xfrm.policy_default[XFRM_POLICY_OUT]; 2265 nlmsg_end(r_skb, r_nlh); 2266 2267 return nlmsg_unicast(net->xfrm.nlsk, r_skb, portid); 2268 } 2269 2270 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 2271 struct nlattr **attrs, 2272 struct netlink_ext_ack *extack) 2273 { 2274 struct net *net = sock_net(skb->sk); 2275 struct xfrm_policy *xp; 2276 struct xfrm_userpolicy_id *p; 2277 u8 type = XFRM_POLICY_TYPE_MAIN; 2278 int err; 2279 struct km_event c; 2280 int delete; 2281 struct xfrm_mark m; 2282 u32 if_id = 0; 2283 2284 p = nlmsg_data(nlh); 2285 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY; 2286 2287 err = copy_from_user_policy_type(&type, attrs, extack); 2288 if (err) 2289 return err; 2290 2291 err = verify_policy_dir(p->dir, extack); 2292 if (err) 2293 return err; 2294 2295 if (attrs[XFRMA_IF_ID]) 2296 if_id = nla_get_u32(attrs[XFRMA_IF_ID]); 2297 2298 xfrm_mark_get(attrs, &m); 2299 2300 if (p->index) 2301 xp = xfrm_policy_byid(net, &m, if_id, type, p->dir, 2302 p->index, delete, &err); 2303 else { 2304 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 2305 struct xfrm_sec_ctx *ctx; 2306 2307 err = verify_sec_ctx_len(attrs, extack); 2308 if (err) 2309 return err; 2310 2311 ctx = NULL; 2312 if (rt) { 2313 struct xfrm_user_sec_ctx *uctx = nla_data(rt); 2314 2315 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL); 2316 if (err) 2317 return err; 2318 } 2319 xp = xfrm_policy_bysel_ctx(net, &m, if_id, type, p->dir, 2320 &p->sel, ctx, delete, &err); 2321 security_xfrm_policy_free(ctx); 2322 } 2323 if (xp == NULL) 2324 return -ENOENT; 2325 2326 if (!delete) { 2327 struct sk_buff *resp_skb; 2328 2329 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq); 2330 if (IS_ERR(resp_skb)) { 2331 err = PTR_ERR(resp_skb); 2332 } else { 2333 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, 2334 NETLINK_CB(skb).portid); 2335 } 2336 } else { 2337 xfrm_audit_policy_delete(xp, err ? 0 : 1, true); 2338 2339 if (err != 0) 2340 goto out; 2341 2342 c.data.byid = p->index; 2343 c.event = nlh->nlmsg_type; 2344 c.seq = nlh->nlmsg_seq; 2345 c.portid = nlh->nlmsg_pid; 2346 km_policy_notify(xp, p->dir, &c); 2347 } 2348 2349 out: 2350 xfrm_pol_put(xp); 2351 return err; 2352 } 2353 2354 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 2355 struct nlattr **attrs, 2356 struct netlink_ext_ack *extack) 2357 { 2358 struct net *net = sock_net(skb->sk); 2359 struct km_event c; 2360 struct xfrm_usersa_flush *p = nlmsg_data(nlh); 2361 int err; 2362 2363 err = xfrm_state_flush(net, p->proto, true, false); 2364 if (err) { 2365 if (err == -ESRCH) /* empty table */ 2366 return 0; 2367 return err; 2368 } 2369 c.data.proto = p->proto; 2370 c.event = nlh->nlmsg_type; 2371 c.seq = nlh->nlmsg_seq; 2372 c.portid = nlh->nlmsg_pid; 2373 c.net = net; 2374 km_state_notify(NULL, &c); 2375 2376 return 0; 2377 } 2378 2379 static inline unsigned int xfrm_aevent_msgsize(struct xfrm_state *x) 2380 { 2381 unsigned int replay_size = x->replay_esn ? 2382 xfrm_replay_state_esn_len(x->replay_esn) : 2383 sizeof(struct xfrm_replay_state); 2384 2385 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id)) 2386 + nla_total_size(replay_size) 2387 + nla_total_size_64bit(sizeof(struct xfrm_lifetime_cur)) 2388 + nla_total_size(sizeof(struct xfrm_mark)) 2389 + nla_total_size(4) /* XFRM_AE_RTHR */ 2390 + nla_total_size(4); /* XFRM_AE_ETHR */ 2391 } 2392 2393 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c) 2394 { 2395 struct xfrm_aevent_id *id; 2396 struct nlmsghdr *nlh; 2397 int err; 2398 2399 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0); 2400 if (nlh == NULL) 2401 return -EMSGSIZE; 2402 2403 id = nlmsg_data(nlh); 2404 memset(&id->sa_id, 0, sizeof(id->sa_id)); 2405 memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr)); 2406 id->sa_id.spi = x->id.spi; 2407 id->sa_id.family = x->props.family; 2408 id->sa_id.proto = x->id.proto; 2409 memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr)); 2410 id->reqid = x->props.reqid; 2411 id->flags = c->data.aevent; 2412 2413 if (x->replay_esn) { 2414 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL, 2415 xfrm_replay_state_esn_len(x->replay_esn), 2416 x->replay_esn); 2417 } else { 2418 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), 2419 &x->replay); 2420 } 2421 if (err) 2422 goto out_cancel; 2423 err = nla_put_64bit(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft, 2424 XFRMA_PAD); 2425 if (err) 2426 goto out_cancel; 2427 2428 if (id->flags & XFRM_AE_RTHR) { 2429 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff); 2430 if (err) 2431 goto out_cancel; 2432 } 2433 if (id->flags & XFRM_AE_ETHR) { 2434 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH, 2435 x->replay_maxage * 10 / HZ); 2436 if (err) 2437 goto out_cancel; 2438 } 2439 err = xfrm_mark_put(skb, &x->mark); 2440 if (err) 2441 goto out_cancel; 2442 2443 err = xfrm_if_id_put(skb, x->if_id); 2444 if (err) 2445 goto out_cancel; 2446 2447 nlmsg_end(skb, nlh); 2448 return 0; 2449 2450 out_cancel: 2451 nlmsg_cancel(skb, nlh); 2452 return err; 2453 } 2454 2455 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh, 2456 struct nlattr **attrs, struct netlink_ext_ack *extack) 2457 { 2458 struct net *net = sock_net(skb->sk); 2459 struct xfrm_state *x; 2460 struct sk_buff *r_skb; 2461 int err; 2462 struct km_event c; 2463 u32 mark; 2464 struct xfrm_mark m; 2465 struct xfrm_aevent_id *p = nlmsg_data(nlh); 2466 struct xfrm_usersa_id *id = &p->sa_id; 2467 2468 mark = xfrm_mark_get(attrs, &m); 2469 2470 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family); 2471 if (x == NULL) 2472 return -ESRCH; 2473 2474 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC); 2475 if (r_skb == NULL) { 2476 xfrm_state_put(x); 2477 return -ENOMEM; 2478 } 2479 2480 /* 2481 * XXX: is this lock really needed - none of the other 2482 * gets lock (the concern is things getting updated 2483 * while we are still reading) - jhs 2484 */ 2485 spin_lock_bh(&x->lock); 2486 c.data.aevent = p->flags; 2487 c.seq = nlh->nlmsg_seq; 2488 c.portid = nlh->nlmsg_pid; 2489 2490 err = build_aevent(r_skb, x, &c); 2491 BUG_ON(err < 0); 2492 2493 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid); 2494 spin_unlock_bh(&x->lock); 2495 xfrm_state_put(x); 2496 return err; 2497 } 2498 2499 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh, 2500 struct nlattr **attrs, struct netlink_ext_ack *extack) 2501 { 2502 struct net *net = sock_net(skb->sk); 2503 struct xfrm_state *x; 2504 struct km_event c; 2505 int err = -EINVAL; 2506 u32 mark = 0; 2507 struct xfrm_mark m; 2508 struct xfrm_aevent_id *p = nlmsg_data(nlh); 2509 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL]; 2510 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL]; 2511 struct nlattr *lt = attrs[XFRMA_LTIME_VAL]; 2512 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH]; 2513 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH]; 2514 2515 if (!lt && !rp && !re && !et && !rt) { 2516 NL_SET_ERR_MSG(extack, "Missing required attribute for AE"); 2517 return err; 2518 } 2519 2520 /* pedantic mode - thou shalt sayeth replaceth */ 2521 if (!(nlh->nlmsg_flags & NLM_F_REPLACE)) { 2522 NL_SET_ERR_MSG(extack, "NLM_F_REPLACE flag is required"); 2523 return err; 2524 } 2525 2526 mark = xfrm_mark_get(attrs, &m); 2527 2528 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family); 2529 if (x == NULL) 2530 return -ESRCH; 2531 2532 if (x->km.state != XFRM_STATE_VALID) { 2533 NL_SET_ERR_MSG(extack, "SA must be in VALID state"); 2534 goto out; 2535 } 2536 2537 err = xfrm_replay_verify_len(x->replay_esn, re, extack); 2538 if (err) 2539 goto out; 2540 2541 spin_lock_bh(&x->lock); 2542 xfrm_update_ae_params(x, attrs, 1); 2543 spin_unlock_bh(&x->lock); 2544 2545 c.event = nlh->nlmsg_type; 2546 c.seq = nlh->nlmsg_seq; 2547 c.portid = nlh->nlmsg_pid; 2548 c.data.aevent = XFRM_AE_CU; 2549 km_state_notify(x, &c); 2550 err = 0; 2551 out: 2552 xfrm_state_put(x); 2553 return err; 2554 } 2555 2556 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 2557 struct nlattr **attrs, 2558 struct netlink_ext_ack *extack) 2559 { 2560 struct net *net = sock_net(skb->sk); 2561 struct km_event c; 2562 u8 type = XFRM_POLICY_TYPE_MAIN; 2563 int err; 2564 2565 err = copy_from_user_policy_type(&type, attrs, extack); 2566 if (err) 2567 return err; 2568 2569 err = xfrm_policy_flush(net, type, true); 2570 if (err) { 2571 if (err == -ESRCH) /* empty table */ 2572 return 0; 2573 return err; 2574 } 2575 2576 c.data.type = type; 2577 c.event = nlh->nlmsg_type; 2578 c.seq = nlh->nlmsg_seq; 2579 c.portid = nlh->nlmsg_pid; 2580 c.net = net; 2581 km_policy_notify(NULL, 0, &c); 2582 return 0; 2583 } 2584 2585 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh, 2586 struct nlattr **attrs, 2587 struct netlink_ext_ack *extack) 2588 { 2589 struct net *net = sock_net(skb->sk); 2590 struct xfrm_policy *xp; 2591 struct xfrm_user_polexpire *up = nlmsg_data(nlh); 2592 struct xfrm_userpolicy_info *p = &up->pol; 2593 u8 type = XFRM_POLICY_TYPE_MAIN; 2594 int err = -ENOENT; 2595 struct xfrm_mark m; 2596 u32 if_id = 0; 2597 2598 err = copy_from_user_policy_type(&type, attrs, extack); 2599 if (err) 2600 return err; 2601 2602 err = verify_policy_dir(p->dir, extack); 2603 if (err) 2604 return err; 2605 2606 if (attrs[XFRMA_IF_ID]) 2607 if_id = nla_get_u32(attrs[XFRMA_IF_ID]); 2608 2609 xfrm_mark_get(attrs, &m); 2610 2611 if (p->index) 2612 xp = xfrm_policy_byid(net, &m, if_id, type, p->dir, p->index, 2613 0, &err); 2614 else { 2615 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 2616 struct xfrm_sec_ctx *ctx; 2617 2618 err = verify_sec_ctx_len(attrs, extack); 2619 if (err) 2620 return err; 2621 2622 ctx = NULL; 2623 if (rt) { 2624 struct xfrm_user_sec_ctx *uctx = nla_data(rt); 2625 2626 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL); 2627 if (err) 2628 return err; 2629 } 2630 xp = xfrm_policy_bysel_ctx(net, &m, if_id, type, p->dir, 2631 &p->sel, ctx, 0, &err); 2632 security_xfrm_policy_free(ctx); 2633 } 2634 if (xp == NULL) 2635 return -ENOENT; 2636 2637 if (unlikely(xp->walk.dead)) 2638 goto out; 2639 2640 err = 0; 2641 if (up->hard) { 2642 xfrm_policy_delete(xp, p->dir); 2643 xfrm_audit_policy_delete(xp, 1, true); 2644 } 2645 km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid); 2646 2647 out: 2648 xfrm_pol_put(xp); 2649 return err; 2650 } 2651 2652 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh, 2653 struct nlattr **attrs, 2654 struct netlink_ext_ack *extack) 2655 { 2656 struct net *net = sock_net(skb->sk); 2657 struct xfrm_state *x; 2658 int err; 2659 struct xfrm_user_expire *ue = nlmsg_data(nlh); 2660 struct xfrm_usersa_info *p = &ue->state; 2661 struct xfrm_mark m; 2662 u32 mark = xfrm_mark_get(attrs, &m); 2663 2664 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family); 2665 2666 err = -ENOENT; 2667 if (x == NULL) 2668 return err; 2669 2670 spin_lock_bh(&x->lock); 2671 err = -EINVAL; 2672 if (x->km.state != XFRM_STATE_VALID) { 2673 NL_SET_ERR_MSG(extack, "SA must be in VALID state"); 2674 goto out; 2675 } 2676 2677 km_state_expired(x, ue->hard, nlh->nlmsg_pid); 2678 2679 if (ue->hard) { 2680 __xfrm_state_delete(x); 2681 xfrm_audit_state_delete(x, 1, true); 2682 } 2683 err = 0; 2684 out: 2685 spin_unlock_bh(&x->lock); 2686 xfrm_state_put(x); 2687 return err; 2688 } 2689 2690 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh, 2691 struct nlattr **attrs, 2692 struct netlink_ext_ack *extack) 2693 { 2694 struct net *net = sock_net(skb->sk); 2695 struct xfrm_policy *xp; 2696 struct xfrm_user_tmpl *ut; 2697 int i; 2698 struct nlattr *rt = attrs[XFRMA_TMPL]; 2699 struct xfrm_mark mark; 2700 2701 struct xfrm_user_acquire *ua = nlmsg_data(nlh); 2702 struct xfrm_state *x = xfrm_state_alloc(net); 2703 int err = -ENOMEM; 2704 2705 if (!x) 2706 goto nomem; 2707 2708 xfrm_mark_get(attrs, &mark); 2709 2710 err = verify_newpolicy_info(&ua->policy, extack); 2711 if (err) 2712 goto free_state; 2713 err = verify_sec_ctx_len(attrs, extack); 2714 if (err) 2715 goto free_state; 2716 2717 /* build an XP */ 2718 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err, extack); 2719 if (!xp) 2720 goto free_state; 2721 2722 memcpy(&x->id, &ua->id, sizeof(ua->id)); 2723 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr)); 2724 memcpy(&x->sel, &ua->sel, sizeof(ua->sel)); 2725 xp->mark.m = x->mark.m = mark.m; 2726 xp->mark.v = x->mark.v = mark.v; 2727 ut = nla_data(rt); 2728 /* extract the templates and for each call km_key */ 2729 for (i = 0; i < xp->xfrm_nr; i++, ut++) { 2730 struct xfrm_tmpl *t = &xp->xfrm_vec[i]; 2731 memcpy(&x->id, &t->id, sizeof(x->id)); 2732 x->props.mode = t->mode; 2733 x->props.reqid = t->reqid; 2734 x->props.family = ut->family; 2735 t->aalgos = ua->aalgos; 2736 t->ealgos = ua->ealgos; 2737 t->calgos = ua->calgos; 2738 err = km_query(x, t, xp); 2739 2740 } 2741 2742 xfrm_state_free(x); 2743 kfree(xp); 2744 2745 return 0; 2746 2747 free_state: 2748 xfrm_state_free(x); 2749 nomem: 2750 return err; 2751 } 2752 2753 #ifdef CONFIG_XFRM_MIGRATE 2754 static int copy_from_user_migrate(struct xfrm_migrate *ma, 2755 struct xfrm_kmaddress *k, 2756 struct nlattr **attrs, int *num, 2757 struct netlink_ext_ack *extack) 2758 { 2759 struct nlattr *rt = attrs[XFRMA_MIGRATE]; 2760 struct xfrm_user_migrate *um; 2761 int i, num_migrate; 2762 2763 if (k != NULL) { 2764 struct xfrm_user_kmaddress *uk; 2765 2766 uk = nla_data(attrs[XFRMA_KMADDRESS]); 2767 memcpy(&k->local, &uk->local, sizeof(k->local)); 2768 memcpy(&k->remote, &uk->remote, sizeof(k->remote)); 2769 k->family = uk->family; 2770 k->reserved = uk->reserved; 2771 } 2772 2773 um = nla_data(rt); 2774 num_migrate = nla_len(rt) / sizeof(*um); 2775 2776 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH) { 2777 NL_SET_ERR_MSG(extack, "Invalid number of SAs to migrate, must be 0 < num <= XFRM_MAX_DEPTH (6)"); 2778 return -EINVAL; 2779 } 2780 2781 for (i = 0; i < num_migrate; i++, um++, ma++) { 2782 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr)); 2783 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr)); 2784 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr)); 2785 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr)); 2786 2787 ma->proto = um->proto; 2788 ma->mode = um->mode; 2789 ma->reqid = um->reqid; 2790 2791 ma->old_family = um->old_family; 2792 ma->new_family = um->new_family; 2793 } 2794 2795 *num = i; 2796 return 0; 2797 } 2798 2799 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh, 2800 struct nlattr **attrs, struct netlink_ext_ack *extack) 2801 { 2802 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh); 2803 struct xfrm_migrate m[XFRM_MAX_DEPTH]; 2804 struct xfrm_kmaddress km, *kmp; 2805 u8 type; 2806 int err; 2807 int n = 0; 2808 struct net *net = sock_net(skb->sk); 2809 struct xfrm_encap_tmpl *encap = NULL; 2810 u32 if_id = 0; 2811 2812 if (!attrs[XFRMA_MIGRATE]) { 2813 NL_SET_ERR_MSG(extack, "Missing required MIGRATE attribute"); 2814 return -EINVAL; 2815 } 2816 2817 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL; 2818 2819 err = copy_from_user_policy_type(&type, attrs, extack); 2820 if (err) 2821 return err; 2822 2823 err = copy_from_user_migrate(m, kmp, attrs, &n, extack); 2824 if (err) 2825 return err; 2826 2827 if (!n) 2828 return 0; 2829 2830 if (attrs[XFRMA_ENCAP]) { 2831 encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]), 2832 sizeof(*encap), GFP_KERNEL); 2833 if (!encap) 2834 return -ENOMEM; 2835 } 2836 2837 if (attrs[XFRMA_IF_ID]) 2838 if_id = nla_get_u32(attrs[XFRMA_IF_ID]); 2839 2840 err = xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net, encap, 2841 if_id, extack); 2842 2843 kfree(encap); 2844 2845 return err; 2846 } 2847 #else 2848 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh, 2849 struct nlattr **attrs, struct netlink_ext_ack *extack) 2850 { 2851 return -ENOPROTOOPT; 2852 } 2853 #endif 2854 2855 #ifdef CONFIG_XFRM_MIGRATE 2856 static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb) 2857 { 2858 struct xfrm_user_migrate um; 2859 2860 memset(&um, 0, sizeof(um)); 2861 um.proto = m->proto; 2862 um.mode = m->mode; 2863 um.reqid = m->reqid; 2864 um.old_family = m->old_family; 2865 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr)); 2866 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr)); 2867 um.new_family = m->new_family; 2868 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr)); 2869 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr)); 2870 2871 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um); 2872 } 2873 2874 static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb) 2875 { 2876 struct xfrm_user_kmaddress uk; 2877 2878 memset(&uk, 0, sizeof(uk)); 2879 uk.family = k->family; 2880 uk.reserved = k->reserved; 2881 memcpy(&uk.local, &k->local, sizeof(uk.local)); 2882 memcpy(&uk.remote, &k->remote, sizeof(uk.remote)); 2883 2884 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk); 2885 } 2886 2887 static inline unsigned int xfrm_migrate_msgsize(int num_migrate, int with_kma, 2888 int with_encp) 2889 { 2890 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id)) 2891 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0) 2892 + (with_encp ? nla_total_size(sizeof(struct xfrm_encap_tmpl)) : 0) 2893 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate) 2894 + userpolicy_type_attrsize(); 2895 } 2896 2897 static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m, 2898 int num_migrate, const struct xfrm_kmaddress *k, 2899 const struct xfrm_selector *sel, 2900 const struct xfrm_encap_tmpl *encap, u8 dir, u8 type) 2901 { 2902 const struct xfrm_migrate *mp; 2903 struct xfrm_userpolicy_id *pol_id; 2904 struct nlmsghdr *nlh; 2905 int i, err; 2906 2907 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0); 2908 if (nlh == NULL) 2909 return -EMSGSIZE; 2910 2911 pol_id = nlmsg_data(nlh); 2912 /* copy data from selector, dir, and type to the pol_id */ 2913 memset(pol_id, 0, sizeof(*pol_id)); 2914 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel)); 2915 pol_id->dir = dir; 2916 2917 if (k != NULL) { 2918 err = copy_to_user_kmaddress(k, skb); 2919 if (err) 2920 goto out_cancel; 2921 } 2922 if (encap) { 2923 err = nla_put(skb, XFRMA_ENCAP, sizeof(*encap), encap); 2924 if (err) 2925 goto out_cancel; 2926 } 2927 err = copy_to_user_policy_type(type, skb); 2928 if (err) 2929 goto out_cancel; 2930 for (i = 0, mp = m ; i < num_migrate; i++, mp++) { 2931 err = copy_to_user_migrate(mp, skb); 2932 if (err) 2933 goto out_cancel; 2934 } 2935 2936 nlmsg_end(skb, nlh); 2937 return 0; 2938 2939 out_cancel: 2940 nlmsg_cancel(skb, nlh); 2941 return err; 2942 } 2943 2944 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 2945 const struct xfrm_migrate *m, int num_migrate, 2946 const struct xfrm_kmaddress *k, 2947 const struct xfrm_encap_tmpl *encap) 2948 { 2949 struct net *net = &init_net; 2950 struct sk_buff *skb; 2951 int err; 2952 2953 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k, !!encap), 2954 GFP_ATOMIC); 2955 if (skb == NULL) 2956 return -ENOMEM; 2957 2958 /* build migrate */ 2959 err = build_migrate(skb, m, num_migrate, k, sel, encap, dir, type); 2960 BUG_ON(err < 0); 2961 2962 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE); 2963 } 2964 #else 2965 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 2966 const struct xfrm_migrate *m, int num_migrate, 2967 const struct xfrm_kmaddress *k, 2968 const struct xfrm_encap_tmpl *encap) 2969 { 2970 return -ENOPROTOOPT; 2971 } 2972 #endif 2973 2974 #define XMSGSIZE(type) sizeof(struct type) 2975 2976 const int xfrm_msg_min[XFRM_NR_MSGTYPES] = { 2977 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), 2978 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), 2979 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), 2980 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), 2981 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 2982 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 2983 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info), 2984 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire), 2985 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire), 2986 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), 2987 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), 2988 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire), 2989 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush), 2990 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0, 2991 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), 2992 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), 2993 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report), 2994 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 2995 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32), 2996 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = sizeof(u32), 2997 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32), 2998 [XFRM_MSG_SETDEFAULT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_default), 2999 [XFRM_MSG_GETDEFAULT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_default), 3000 }; 3001 EXPORT_SYMBOL_GPL(xfrm_msg_min); 3002 3003 #undef XMSGSIZE 3004 3005 const struct nla_policy xfrma_policy[XFRMA_MAX+1] = { 3006 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)}, 3007 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)}, 3008 [XFRMA_LASTUSED] = { .type = NLA_U64}, 3009 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)}, 3010 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) }, 3011 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) }, 3012 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) }, 3013 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) }, 3014 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) }, 3015 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) }, 3016 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) }, 3017 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) }, 3018 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) }, 3019 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 }, 3020 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 }, 3021 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) }, 3022 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) }, 3023 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)}, 3024 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) }, 3025 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) }, 3026 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) }, 3027 [XFRMA_TFCPAD] = { .type = NLA_U32 }, 3028 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) }, 3029 [XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 }, 3030 [XFRMA_PROTO] = { .type = NLA_U8 }, 3031 [XFRMA_ADDRESS_FILTER] = { .len = sizeof(struct xfrm_address_filter) }, 3032 [XFRMA_OFFLOAD_DEV] = { .len = sizeof(struct xfrm_user_offload) }, 3033 [XFRMA_SET_MARK] = { .type = NLA_U32 }, 3034 [XFRMA_SET_MARK_MASK] = { .type = NLA_U32 }, 3035 [XFRMA_IF_ID] = { .type = NLA_U32 }, 3036 }; 3037 EXPORT_SYMBOL_GPL(xfrma_policy); 3038 3039 static const struct nla_policy xfrma_spd_policy[XFRMA_SPD_MAX+1] = { 3040 [XFRMA_SPD_IPV4_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) }, 3041 [XFRMA_SPD_IPV6_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) }, 3042 }; 3043 3044 static const struct xfrm_link { 3045 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **, 3046 struct netlink_ext_ack *); 3047 int (*start)(struct netlink_callback *); 3048 int (*dump)(struct sk_buff *, struct netlink_callback *); 3049 int (*done)(struct netlink_callback *); 3050 const struct nla_policy *nla_pol; 3051 int nla_max; 3052 } xfrm_dispatch[XFRM_NR_MSGTYPES] = { 3053 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, 3054 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa }, 3055 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa, 3056 .dump = xfrm_dump_sa, 3057 .done = xfrm_dump_sa_done }, 3058 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, 3059 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy }, 3060 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy, 3061 .start = xfrm_dump_policy_start, 3062 .dump = xfrm_dump_policy, 3063 .done = xfrm_dump_policy_done }, 3064 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi }, 3065 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire }, 3066 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire }, 3067 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, 3068 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, 3069 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire}, 3070 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa }, 3071 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy }, 3072 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae }, 3073 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae }, 3074 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate }, 3075 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo }, 3076 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_set_spdinfo, 3077 .nla_pol = xfrma_spd_policy, 3078 .nla_max = XFRMA_SPD_MAX }, 3079 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo }, 3080 [XFRM_MSG_SETDEFAULT - XFRM_MSG_BASE] = { .doit = xfrm_set_default }, 3081 [XFRM_MSG_GETDEFAULT - XFRM_MSG_BASE] = { .doit = xfrm_get_default }, 3082 }; 3083 3084 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, 3085 struct netlink_ext_ack *extack) 3086 { 3087 struct net *net = sock_net(skb->sk); 3088 struct nlattr *attrs[XFRMA_MAX+1]; 3089 const struct xfrm_link *link; 3090 struct nlmsghdr *nlh64 = NULL; 3091 int type, err; 3092 3093 type = nlh->nlmsg_type; 3094 if (type > XFRM_MSG_MAX) 3095 return -EINVAL; 3096 3097 type -= XFRM_MSG_BASE; 3098 link = &xfrm_dispatch[type]; 3099 3100 /* All operations require privileges, even GET */ 3101 if (!netlink_net_capable(skb, CAP_NET_ADMIN)) 3102 return -EPERM; 3103 3104 if (in_compat_syscall()) { 3105 struct xfrm_translator *xtr = xfrm_get_translator(); 3106 3107 if (!xtr) 3108 return -EOPNOTSUPP; 3109 3110 nlh64 = xtr->rcv_msg_compat(nlh, link->nla_max, 3111 link->nla_pol, extack); 3112 xfrm_put_translator(xtr); 3113 if (IS_ERR(nlh64)) 3114 return PTR_ERR(nlh64); 3115 if (nlh64) 3116 nlh = nlh64; 3117 } 3118 3119 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) || 3120 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) && 3121 (nlh->nlmsg_flags & NLM_F_DUMP)) { 3122 struct netlink_dump_control c = { 3123 .start = link->start, 3124 .dump = link->dump, 3125 .done = link->done, 3126 }; 3127 3128 if (link->dump == NULL) { 3129 err = -EINVAL; 3130 goto err; 3131 } 3132 3133 err = netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c); 3134 goto err; 3135 } 3136 3137 err = nlmsg_parse_deprecated(nlh, xfrm_msg_min[type], attrs, 3138 link->nla_max ? : XFRMA_MAX, 3139 link->nla_pol ? : xfrma_policy, extack); 3140 if (err < 0) 3141 goto err; 3142 3143 if (link->doit == NULL) { 3144 err = -EINVAL; 3145 goto err; 3146 } 3147 3148 err = link->doit(skb, nlh, attrs, extack); 3149 3150 /* We need to free skb allocated in xfrm_alloc_compat() before 3151 * returning from this function, because consume_skb() won't take 3152 * care of frag_list since netlink destructor sets 3153 * sbk->head to NULL. (see netlink_skb_destructor()) 3154 */ 3155 if (skb_has_frag_list(skb)) { 3156 kfree_skb(skb_shinfo(skb)->frag_list); 3157 skb_shinfo(skb)->frag_list = NULL; 3158 } 3159 3160 err: 3161 kvfree(nlh64); 3162 return err; 3163 } 3164 3165 static void xfrm_netlink_rcv(struct sk_buff *skb) 3166 { 3167 struct net *net = sock_net(skb->sk); 3168 3169 mutex_lock(&net->xfrm.xfrm_cfg_mutex); 3170 netlink_rcv_skb(skb, &xfrm_user_rcv_msg); 3171 mutex_unlock(&net->xfrm.xfrm_cfg_mutex); 3172 } 3173 3174 static inline unsigned int xfrm_expire_msgsize(void) 3175 { 3176 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire)) 3177 + nla_total_size(sizeof(struct xfrm_mark)); 3178 } 3179 3180 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c) 3181 { 3182 struct xfrm_user_expire *ue; 3183 struct nlmsghdr *nlh; 3184 int err; 3185 3186 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0); 3187 if (nlh == NULL) 3188 return -EMSGSIZE; 3189 3190 ue = nlmsg_data(nlh); 3191 copy_to_user_state(x, &ue->state); 3192 ue->hard = (c->data.hard != 0) ? 1 : 0; 3193 /* clear the padding bytes */ 3194 memset_after(ue, 0, hard); 3195 3196 err = xfrm_mark_put(skb, &x->mark); 3197 if (err) 3198 return err; 3199 3200 err = xfrm_if_id_put(skb, x->if_id); 3201 if (err) 3202 return err; 3203 3204 nlmsg_end(skb, nlh); 3205 return 0; 3206 } 3207 3208 static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c) 3209 { 3210 struct net *net = xs_net(x); 3211 struct sk_buff *skb; 3212 3213 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC); 3214 if (skb == NULL) 3215 return -ENOMEM; 3216 3217 if (build_expire(skb, x, c) < 0) { 3218 kfree_skb(skb); 3219 return -EMSGSIZE; 3220 } 3221 3222 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE); 3223 } 3224 3225 static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c) 3226 { 3227 struct net *net = xs_net(x); 3228 struct sk_buff *skb; 3229 int err; 3230 3231 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC); 3232 if (skb == NULL) 3233 return -ENOMEM; 3234 3235 err = build_aevent(skb, x, c); 3236 BUG_ON(err < 0); 3237 3238 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS); 3239 } 3240 3241 static int xfrm_notify_sa_flush(const struct km_event *c) 3242 { 3243 struct net *net = c->net; 3244 struct xfrm_usersa_flush *p; 3245 struct nlmsghdr *nlh; 3246 struct sk_buff *skb; 3247 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush)); 3248 3249 skb = nlmsg_new(len, GFP_ATOMIC); 3250 if (skb == NULL) 3251 return -ENOMEM; 3252 3253 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0); 3254 if (nlh == NULL) { 3255 kfree_skb(skb); 3256 return -EMSGSIZE; 3257 } 3258 3259 p = nlmsg_data(nlh); 3260 p->proto = c->data.proto; 3261 3262 nlmsg_end(skb, nlh); 3263 3264 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA); 3265 } 3266 3267 static inline unsigned int xfrm_sa_len(struct xfrm_state *x) 3268 { 3269 unsigned int l = 0; 3270 if (x->aead) 3271 l += nla_total_size(aead_len(x->aead)); 3272 if (x->aalg) { 3273 l += nla_total_size(sizeof(struct xfrm_algo) + 3274 (x->aalg->alg_key_len + 7) / 8); 3275 l += nla_total_size(xfrm_alg_auth_len(x->aalg)); 3276 } 3277 if (x->ealg) 3278 l += nla_total_size(xfrm_alg_len(x->ealg)); 3279 if (x->calg) 3280 l += nla_total_size(sizeof(*x->calg)); 3281 if (x->encap) 3282 l += nla_total_size(sizeof(*x->encap)); 3283 if (x->tfcpad) 3284 l += nla_total_size(sizeof(x->tfcpad)); 3285 if (x->replay_esn) 3286 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn)); 3287 else 3288 l += nla_total_size(sizeof(struct xfrm_replay_state)); 3289 if (x->security) 3290 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) + 3291 x->security->ctx_len); 3292 if (x->coaddr) 3293 l += nla_total_size(sizeof(*x->coaddr)); 3294 if (x->props.extra_flags) 3295 l += nla_total_size(sizeof(x->props.extra_flags)); 3296 if (x->xso.dev) 3297 l += nla_total_size(sizeof(struct xfrm_user_offload)); 3298 if (x->props.smark.v | x->props.smark.m) { 3299 l += nla_total_size(sizeof(x->props.smark.v)); 3300 l += nla_total_size(sizeof(x->props.smark.m)); 3301 } 3302 if (x->if_id) 3303 l += nla_total_size(sizeof(x->if_id)); 3304 3305 /* Must count x->lastused as it may become non-zero behind our back. */ 3306 l += nla_total_size_64bit(sizeof(u64)); 3307 3308 if (x->mapping_maxage) 3309 l += nla_total_size(sizeof(x->mapping_maxage)); 3310 3311 return l; 3312 } 3313 3314 static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c) 3315 { 3316 struct net *net = xs_net(x); 3317 struct xfrm_usersa_info *p; 3318 struct xfrm_usersa_id *id; 3319 struct nlmsghdr *nlh; 3320 struct sk_buff *skb; 3321 unsigned int len = xfrm_sa_len(x); 3322 unsigned int headlen; 3323 int err; 3324 3325 headlen = sizeof(*p); 3326 if (c->event == XFRM_MSG_DELSA) { 3327 len += nla_total_size(headlen); 3328 headlen = sizeof(*id); 3329 len += nla_total_size(sizeof(struct xfrm_mark)); 3330 } 3331 len += NLMSG_ALIGN(headlen); 3332 3333 skb = nlmsg_new(len, GFP_ATOMIC); 3334 if (skb == NULL) 3335 return -ENOMEM; 3336 3337 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0); 3338 err = -EMSGSIZE; 3339 if (nlh == NULL) 3340 goto out_free_skb; 3341 3342 p = nlmsg_data(nlh); 3343 if (c->event == XFRM_MSG_DELSA) { 3344 struct nlattr *attr; 3345 3346 id = nlmsg_data(nlh); 3347 memset(id, 0, sizeof(*id)); 3348 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr)); 3349 id->spi = x->id.spi; 3350 id->family = x->props.family; 3351 id->proto = x->id.proto; 3352 3353 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p)); 3354 err = -EMSGSIZE; 3355 if (attr == NULL) 3356 goto out_free_skb; 3357 3358 p = nla_data(attr); 3359 } 3360 err = copy_to_user_state_extra(x, p, skb); 3361 if (err) 3362 goto out_free_skb; 3363 3364 nlmsg_end(skb, nlh); 3365 3366 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA); 3367 3368 out_free_skb: 3369 kfree_skb(skb); 3370 return err; 3371 } 3372 3373 static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c) 3374 { 3375 3376 switch (c->event) { 3377 case XFRM_MSG_EXPIRE: 3378 return xfrm_exp_state_notify(x, c); 3379 case XFRM_MSG_NEWAE: 3380 return xfrm_aevent_state_notify(x, c); 3381 case XFRM_MSG_DELSA: 3382 case XFRM_MSG_UPDSA: 3383 case XFRM_MSG_NEWSA: 3384 return xfrm_notify_sa(x, c); 3385 case XFRM_MSG_FLUSHSA: 3386 return xfrm_notify_sa_flush(c); 3387 default: 3388 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n", 3389 c->event); 3390 break; 3391 } 3392 3393 return 0; 3394 3395 } 3396 3397 static inline unsigned int xfrm_acquire_msgsize(struct xfrm_state *x, 3398 struct xfrm_policy *xp) 3399 { 3400 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire)) 3401 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr) 3402 + nla_total_size(sizeof(struct xfrm_mark)) 3403 + nla_total_size(xfrm_user_sec_ctx_size(x->security)) 3404 + userpolicy_type_attrsize(); 3405 } 3406 3407 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x, 3408 struct xfrm_tmpl *xt, struct xfrm_policy *xp) 3409 { 3410 __u32 seq = xfrm_get_acqseq(); 3411 struct xfrm_user_acquire *ua; 3412 struct nlmsghdr *nlh; 3413 int err; 3414 3415 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0); 3416 if (nlh == NULL) 3417 return -EMSGSIZE; 3418 3419 ua = nlmsg_data(nlh); 3420 memcpy(&ua->id, &x->id, sizeof(ua->id)); 3421 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr)); 3422 memcpy(&ua->sel, &x->sel, sizeof(ua->sel)); 3423 copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT); 3424 ua->aalgos = xt->aalgos; 3425 ua->ealgos = xt->ealgos; 3426 ua->calgos = xt->calgos; 3427 ua->seq = x->km.seq = seq; 3428 3429 err = copy_to_user_tmpl(xp, skb); 3430 if (!err) 3431 err = copy_to_user_state_sec_ctx(x, skb); 3432 if (!err) 3433 err = copy_to_user_policy_type(xp->type, skb); 3434 if (!err) 3435 err = xfrm_mark_put(skb, &xp->mark); 3436 if (!err) 3437 err = xfrm_if_id_put(skb, xp->if_id); 3438 if (!err && xp->xdo.dev) 3439 err = copy_user_offload(&xp->xdo, skb); 3440 if (err) { 3441 nlmsg_cancel(skb, nlh); 3442 return err; 3443 } 3444 3445 nlmsg_end(skb, nlh); 3446 return 0; 3447 } 3448 3449 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt, 3450 struct xfrm_policy *xp) 3451 { 3452 struct net *net = xs_net(x); 3453 struct sk_buff *skb; 3454 int err; 3455 3456 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC); 3457 if (skb == NULL) 3458 return -ENOMEM; 3459 3460 err = build_acquire(skb, x, xt, xp); 3461 BUG_ON(err < 0); 3462 3463 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE); 3464 } 3465 3466 /* User gives us xfrm_user_policy_info followed by an array of 0 3467 * or more templates. 3468 */ 3469 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt, 3470 u8 *data, int len, int *dir) 3471 { 3472 struct net *net = sock_net(sk); 3473 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data; 3474 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1); 3475 struct xfrm_policy *xp; 3476 int nr; 3477 3478 switch (sk->sk_family) { 3479 case AF_INET: 3480 if (opt != IP_XFRM_POLICY) { 3481 *dir = -EOPNOTSUPP; 3482 return NULL; 3483 } 3484 break; 3485 #if IS_ENABLED(CONFIG_IPV6) 3486 case AF_INET6: 3487 if (opt != IPV6_XFRM_POLICY) { 3488 *dir = -EOPNOTSUPP; 3489 return NULL; 3490 } 3491 break; 3492 #endif 3493 default: 3494 *dir = -EINVAL; 3495 return NULL; 3496 } 3497 3498 *dir = -EINVAL; 3499 3500 if (len < sizeof(*p) || 3501 verify_newpolicy_info(p, NULL)) 3502 return NULL; 3503 3504 nr = ((len - sizeof(*p)) / sizeof(*ut)); 3505 if (validate_tmpl(nr, ut, p->sel.family, p->dir, NULL)) 3506 return NULL; 3507 3508 if (p->dir > XFRM_POLICY_OUT) 3509 return NULL; 3510 3511 xp = xfrm_policy_alloc(net, GFP_ATOMIC); 3512 if (xp == NULL) { 3513 *dir = -ENOBUFS; 3514 return NULL; 3515 } 3516 3517 copy_from_user_policy(xp, p); 3518 xp->type = XFRM_POLICY_TYPE_MAIN; 3519 copy_templates(xp, ut, nr); 3520 3521 *dir = p->dir; 3522 3523 return xp; 3524 } 3525 3526 static inline unsigned int xfrm_polexpire_msgsize(struct xfrm_policy *xp) 3527 { 3528 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire)) 3529 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr) 3530 + nla_total_size(xfrm_user_sec_ctx_size(xp->security)) 3531 + nla_total_size(sizeof(struct xfrm_mark)) 3532 + userpolicy_type_attrsize(); 3533 } 3534 3535 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp, 3536 int dir, const struct km_event *c) 3537 { 3538 struct xfrm_user_polexpire *upe; 3539 int hard = c->data.hard; 3540 struct nlmsghdr *nlh; 3541 int err; 3542 3543 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0); 3544 if (nlh == NULL) 3545 return -EMSGSIZE; 3546 3547 upe = nlmsg_data(nlh); 3548 copy_to_user_policy(xp, &upe->pol, dir); 3549 err = copy_to_user_tmpl(xp, skb); 3550 if (!err) 3551 err = copy_to_user_sec_ctx(xp, skb); 3552 if (!err) 3553 err = copy_to_user_policy_type(xp->type, skb); 3554 if (!err) 3555 err = xfrm_mark_put(skb, &xp->mark); 3556 if (!err) 3557 err = xfrm_if_id_put(skb, xp->if_id); 3558 if (!err && xp->xdo.dev) 3559 err = copy_user_offload(&xp->xdo, skb); 3560 if (err) { 3561 nlmsg_cancel(skb, nlh); 3562 return err; 3563 } 3564 upe->hard = !!hard; 3565 3566 nlmsg_end(skb, nlh); 3567 return 0; 3568 } 3569 3570 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 3571 { 3572 struct net *net = xp_net(xp); 3573 struct sk_buff *skb; 3574 int err; 3575 3576 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC); 3577 if (skb == NULL) 3578 return -ENOMEM; 3579 3580 err = build_polexpire(skb, xp, dir, c); 3581 BUG_ON(err < 0); 3582 3583 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE); 3584 } 3585 3586 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c) 3587 { 3588 unsigned int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr); 3589 struct net *net = xp_net(xp); 3590 struct xfrm_userpolicy_info *p; 3591 struct xfrm_userpolicy_id *id; 3592 struct nlmsghdr *nlh; 3593 struct sk_buff *skb; 3594 unsigned int headlen; 3595 int err; 3596 3597 headlen = sizeof(*p); 3598 if (c->event == XFRM_MSG_DELPOLICY) { 3599 len += nla_total_size(headlen); 3600 headlen = sizeof(*id); 3601 } 3602 len += userpolicy_type_attrsize(); 3603 len += nla_total_size(sizeof(struct xfrm_mark)); 3604 len += NLMSG_ALIGN(headlen); 3605 3606 skb = nlmsg_new(len, GFP_ATOMIC); 3607 if (skb == NULL) 3608 return -ENOMEM; 3609 3610 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0); 3611 err = -EMSGSIZE; 3612 if (nlh == NULL) 3613 goto out_free_skb; 3614 3615 p = nlmsg_data(nlh); 3616 if (c->event == XFRM_MSG_DELPOLICY) { 3617 struct nlattr *attr; 3618 3619 id = nlmsg_data(nlh); 3620 memset(id, 0, sizeof(*id)); 3621 id->dir = dir; 3622 if (c->data.byid) 3623 id->index = xp->index; 3624 else 3625 memcpy(&id->sel, &xp->selector, sizeof(id->sel)); 3626 3627 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p)); 3628 err = -EMSGSIZE; 3629 if (attr == NULL) 3630 goto out_free_skb; 3631 3632 p = nla_data(attr); 3633 } 3634 3635 copy_to_user_policy(xp, p, dir); 3636 err = copy_to_user_tmpl(xp, skb); 3637 if (!err) 3638 err = copy_to_user_policy_type(xp->type, skb); 3639 if (!err) 3640 err = xfrm_mark_put(skb, &xp->mark); 3641 if (!err) 3642 err = xfrm_if_id_put(skb, xp->if_id); 3643 if (!err && xp->xdo.dev) 3644 err = copy_user_offload(&xp->xdo, skb); 3645 if (err) 3646 goto out_free_skb; 3647 3648 nlmsg_end(skb, nlh); 3649 3650 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY); 3651 3652 out_free_skb: 3653 kfree_skb(skb); 3654 return err; 3655 } 3656 3657 static int xfrm_notify_policy_flush(const struct km_event *c) 3658 { 3659 struct net *net = c->net; 3660 struct nlmsghdr *nlh; 3661 struct sk_buff *skb; 3662 int err; 3663 3664 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC); 3665 if (skb == NULL) 3666 return -ENOMEM; 3667 3668 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0); 3669 err = -EMSGSIZE; 3670 if (nlh == NULL) 3671 goto out_free_skb; 3672 err = copy_to_user_policy_type(c->data.type, skb); 3673 if (err) 3674 goto out_free_skb; 3675 3676 nlmsg_end(skb, nlh); 3677 3678 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY); 3679 3680 out_free_skb: 3681 kfree_skb(skb); 3682 return err; 3683 } 3684 3685 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 3686 { 3687 3688 switch (c->event) { 3689 case XFRM_MSG_NEWPOLICY: 3690 case XFRM_MSG_UPDPOLICY: 3691 case XFRM_MSG_DELPOLICY: 3692 return xfrm_notify_policy(xp, dir, c); 3693 case XFRM_MSG_FLUSHPOLICY: 3694 return xfrm_notify_policy_flush(c); 3695 case XFRM_MSG_POLEXPIRE: 3696 return xfrm_exp_policy_notify(xp, dir, c); 3697 default: 3698 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n", 3699 c->event); 3700 } 3701 3702 return 0; 3703 3704 } 3705 3706 static inline unsigned int xfrm_report_msgsize(void) 3707 { 3708 return NLMSG_ALIGN(sizeof(struct xfrm_user_report)); 3709 } 3710 3711 static int build_report(struct sk_buff *skb, u8 proto, 3712 struct xfrm_selector *sel, xfrm_address_t *addr) 3713 { 3714 struct xfrm_user_report *ur; 3715 struct nlmsghdr *nlh; 3716 3717 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0); 3718 if (nlh == NULL) 3719 return -EMSGSIZE; 3720 3721 ur = nlmsg_data(nlh); 3722 ur->proto = proto; 3723 memcpy(&ur->sel, sel, sizeof(ur->sel)); 3724 3725 if (addr) { 3726 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr); 3727 if (err) { 3728 nlmsg_cancel(skb, nlh); 3729 return err; 3730 } 3731 } 3732 nlmsg_end(skb, nlh); 3733 return 0; 3734 } 3735 3736 static int xfrm_send_report(struct net *net, u8 proto, 3737 struct xfrm_selector *sel, xfrm_address_t *addr) 3738 { 3739 struct sk_buff *skb; 3740 int err; 3741 3742 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC); 3743 if (skb == NULL) 3744 return -ENOMEM; 3745 3746 err = build_report(skb, proto, sel, addr); 3747 BUG_ON(err < 0); 3748 3749 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT); 3750 } 3751 3752 static inline unsigned int xfrm_mapping_msgsize(void) 3753 { 3754 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping)); 3755 } 3756 3757 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x, 3758 xfrm_address_t *new_saddr, __be16 new_sport) 3759 { 3760 struct xfrm_user_mapping *um; 3761 struct nlmsghdr *nlh; 3762 3763 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0); 3764 if (nlh == NULL) 3765 return -EMSGSIZE; 3766 3767 um = nlmsg_data(nlh); 3768 3769 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr)); 3770 um->id.spi = x->id.spi; 3771 um->id.family = x->props.family; 3772 um->id.proto = x->id.proto; 3773 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr)); 3774 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr)); 3775 um->new_sport = new_sport; 3776 um->old_sport = x->encap->encap_sport; 3777 um->reqid = x->props.reqid; 3778 3779 nlmsg_end(skb, nlh); 3780 return 0; 3781 } 3782 3783 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, 3784 __be16 sport) 3785 { 3786 struct net *net = xs_net(x); 3787 struct sk_buff *skb; 3788 int err; 3789 3790 if (x->id.proto != IPPROTO_ESP) 3791 return -EINVAL; 3792 3793 if (!x->encap) 3794 return -EINVAL; 3795 3796 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC); 3797 if (skb == NULL) 3798 return -ENOMEM; 3799 3800 err = build_mapping(skb, x, ipaddr, sport); 3801 BUG_ON(err < 0); 3802 3803 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING); 3804 } 3805 3806 static bool xfrm_is_alive(const struct km_event *c) 3807 { 3808 return (bool)xfrm_acquire_is_on(c->net); 3809 } 3810 3811 static struct xfrm_mgr netlink_mgr = { 3812 .notify = xfrm_send_state_notify, 3813 .acquire = xfrm_send_acquire, 3814 .compile_policy = xfrm_compile_policy, 3815 .notify_policy = xfrm_send_policy_notify, 3816 .report = xfrm_send_report, 3817 .migrate = xfrm_send_migrate, 3818 .new_mapping = xfrm_send_mapping, 3819 .is_alive = xfrm_is_alive, 3820 }; 3821 3822 static int __net_init xfrm_user_net_init(struct net *net) 3823 { 3824 struct sock *nlsk; 3825 struct netlink_kernel_cfg cfg = { 3826 .groups = XFRMNLGRP_MAX, 3827 .input = xfrm_netlink_rcv, 3828 }; 3829 3830 nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg); 3831 if (nlsk == NULL) 3832 return -ENOMEM; 3833 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */ 3834 rcu_assign_pointer(net->xfrm.nlsk, nlsk); 3835 return 0; 3836 } 3837 3838 static void __net_exit xfrm_user_net_pre_exit(struct net *net) 3839 { 3840 RCU_INIT_POINTER(net->xfrm.nlsk, NULL); 3841 } 3842 3843 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list) 3844 { 3845 struct net *net; 3846 3847 list_for_each_entry(net, net_exit_list, exit_list) 3848 netlink_kernel_release(net->xfrm.nlsk_stash); 3849 } 3850 3851 static struct pernet_operations xfrm_user_net_ops = { 3852 .init = xfrm_user_net_init, 3853 .pre_exit = xfrm_user_net_pre_exit, 3854 .exit_batch = xfrm_user_net_exit, 3855 }; 3856 3857 static int __init xfrm_user_init(void) 3858 { 3859 int rv; 3860 3861 printk(KERN_INFO "Initializing XFRM netlink socket\n"); 3862 3863 rv = register_pernet_subsys(&xfrm_user_net_ops); 3864 if (rv < 0) 3865 return rv; 3866 xfrm_register_km(&netlink_mgr); 3867 return 0; 3868 } 3869 3870 static void __exit xfrm_user_exit(void) 3871 { 3872 xfrm_unregister_km(&netlink_mgr); 3873 unregister_pernet_subsys(&xfrm_user_net_ops); 3874 } 3875 3876 module_init(xfrm_user_init); 3877 module_exit(xfrm_user_exit); 3878 MODULE_LICENSE("GPL"); 3879 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM); 3880