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