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