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