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