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 if (p->sel.prefixlen_d > 32 || p->sel.prefixlen_s > 32) 155 goto out; 156 157 break; 158 159 case AF_INET6: 160 #if IS_ENABLED(CONFIG_IPV6) 161 if (p->sel.prefixlen_d > 128 || p->sel.prefixlen_s > 128) 162 goto out; 163 164 break; 165 #else 166 err = -EAFNOSUPPORT; 167 goto out; 168 #endif 169 170 default: 171 goto out; 172 } 173 174 err = -EINVAL; 175 switch (p->id.proto) { 176 case IPPROTO_AH: 177 if ((!attrs[XFRMA_ALG_AUTH] && 178 !attrs[XFRMA_ALG_AUTH_TRUNC]) || 179 attrs[XFRMA_ALG_AEAD] || 180 attrs[XFRMA_ALG_CRYPT] || 181 attrs[XFRMA_ALG_COMP] || 182 attrs[XFRMA_TFCPAD]) 183 goto out; 184 break; 185 186 case IPPROTO_ESP: 187 if (attrs[XFRMA_ALG_COMP]) 188 goto out; 189 if (!attrs[XFRMA_ALG_AUTH] && 190 !attrs[XFRMA_ALG_AUTH_TRUNC] && 191 !attrs[XFRMA_ALG_CRYPT] && 192 !attrs[XFRMA_ALG_AEAD]) 193 goto out; 194 if ((attrs[XFRMA_ALG_AUTH] || 195 attrs[XFRMA_ALG_AUTH_TRUNC] || 196 attrs[XFRMA_ALG_CRYPT]) && 197 attrs[XFRMA_ALG_AEAD]) 198 goto out; 199 if (attrs[XFRMA_TFCPAD] && 200 p->mode != XFRM_MODE_TUNNEL) 201 goto out; 202 break; 203 204 case IPPROTO_COMP: 205 if (!attrs[XFRMA_ALG_COMP] || 206 attrs[XFRMA_ALG_AEAD] || 207 attrs[XFRMA_ALG_AUTH] || 208 attrs[XFRMA_ALG_AUTH_TRUNC] || 209 attrs[XFRMA_ALG_CRYPT] || 210 attrs[XFRMA_TFCPAD] || 211 (ntohl(p->id.spi) >= 0x10000)) 212 goto out; 213 break; 214 215 #if IS_ENABLED(CONFIG_IPV6) 216 case IPPROTO_DSTOPTS: 217 case IPPROTO_ROUTING: 218 if (attrs[XFRMA_ALG_COMP] || 219 attrs[XFRMA_ALG_AUTH] || 220 attrs[XFRMA_ALG_AUTH_TRUNC] || 221 attrs[XFRMA_ALG_AEAD] || 222 attrs[XFRMA_ALG_CRYPT] || 223 attrs[XFRMA_ENCAP] || 224 attrs[XFRMA_SEC_CTX] || 225 attrs[XFRMA_TFCPAD] || 226 !attrs[XFRMA_COADDR]) 227 goto out; 228 break; 229 #endif 230 231 default: 232 goto out; 233 } 234 235 if ((err = verify_aead(attrs))) 236 goto out; 237 if ((err = verify_auth_trunc(attrs))) 238 goto out; 239 if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH))) 240 goto out; 241 if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT))) 242 goto out; 243 if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP))) 244 goto out; 245 if ((err = verify_sec_ctx_len(attrs))) 246 goto out; 247 if ((err = verify_replay(p, attrs))) 248 goto out; 249 250 err = -EINVAL; 251 switch (p->mode) { 252 case XFRM_MODE_TRANSPORT: 253 case XFRM_MODE_TUNNEL: 254 case XFRM_MODE_ROUTEOPTIMIZATION: 255 case XFRM_MODE_BEET: 256 break; 257 258 default: 259 goto out; 260 } 261 262 err = 0; 263 264 out: 265 return err; 266 } 267 268 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props, 269 struct xfrm_algo_desc *(*get_byname)(const char *, int), 270 struct nlattr *rta) 271 { 272 struct xfrm_algo *p, *ualg; 273 struct xfrm_algo_desc *algo; 274 275 if (!rta) 276 return 0; 277 278 ualg = nla_data(rta); 279 280 algo = get_byname(ualg->alg_name, 1); 281 if (!algo) 282 return -ENOSYS; 283 *props = algo->desc.sadb_alg_id; 284 285 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL); 286 if (!p) 287 return -ENOMEM; 288 289 strcpy(p->alg_name, algo->name); 290 *algpp = p; 291 return 0; 292 } 293 294 static int attach_crypt(struct xfrm_state *x, struct nlattr *rta) 295 { 296 struct xfrm_algo *p, *ualg; 297 struct xfrm_algo_desc *algo; 298 299 if (!rta) 300 return 0; 301 302 ualg = nla_data(rta); 303 304 algo = xfrm_ealg_get_byname(ualg->alg_name, 1); 305 if (!algo) 306 return -ENOSYS; 307 x->props.ealgo = algo->desc.sadb_alg_id; 308 309 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL); 310 if (!p) 311 return -ENOMEM; 312 313 strcpy(p->alg_name, algo->name); 314 x->ealg = p; 315 x->geniv = algo->uinfo.encr.geniv; 316 return 0; 317 } 318 319 static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props, 320 struct nlattr *rta) 321 { 322 struct xfrm_algo *ualg; 323 struct xfrm_algo_auth *p; 324 struct xfrm_algo_desc *algo; 325 326 if (!rta) 327 return 0; 328 329 ualg = nla_data(rta); 330 331 algo = xfrm_aalg_get_byname(ualg->alg_name, 1); 332 if (!algo) 333 return -ENOSYS; 334 *props = algo->desc.sadb_alg_id; 335 336 p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL); 337 if (!p) 338 return -ENOMEM; 339 340 strcpy(p->alg_name, algo->name); 341 p->alg_key_len = ualg->alg_key_len; 342 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits; 343 memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8); 344 345 *algpp = p; 346 return 0; 347 } 348 349 static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props, 350 struct nlattr *rta) 351 { 352 struct xfrm_algo_auth *p, *ualg; 353 struct xfrm_algo_desc *algo; 354 355 if (!rta) 356 return 0; 357 358 ualg = nla_data(rta); 359 360 algo = xfrm_aalg_get_byname(ualg->alg_name, 1); 361 if (!algo) 362 return -ENOSYS; 363 if (ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits) 364 return -EINVAL; 365 *props = algo->desc.sadb_alg_id; 366 367 p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL); 368 if (!p) 369 return -ENOMEM; 370 371 strcpy(p->alg_name, algo->name); 372 if (!p->alg_trunc_len) 373 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits; 374 375 *algpp = p; 376 return 0; 377 } 378 379 static int attach_aead(struct xfrm_state *x, struct nlattr *rta) 380 { 381 struct xfrm_algo_aead *p, *ualg; 382 struct xfrm_algo_desc *algo; 383 384 if (!rta) 385 return 0; 386 387 ualg = nla_data(rta); 388 389 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1); 390 if (!algo) 391 return -ENOSYS; 392 x->props.ealgo = algo->desc.sadb_alg_id; 393 394 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL); 395 if (!p) 396 return -ENOMEM; 397 398 strcpy(p->alg_name, algo->name); 399 x->aead = p; 400 x->geniv = algo->uinfo.aead.geniv; 401 return 0; 402 } 403 404 static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn, 405 struct nlattr *rp) 406 { 407 struct xfrm_replay_state_esn *up; 408 unsigned int ulen; 409 410 if (!replay_esn || !rp) 411 return 0; 412 413 up = nla_data(rp); 414 ulen = xfrm_replay_state_esn_len(up); 415 416 /* Check the overall length and the internal bitmap length to avoid 417 * potential overflow. */ 418 if (nla_len(rp) < (int)ulen || 419 xfrm_replay_state_esn_len(replay_esn) != ulen || 420 replay_esn->bmp_len != up->bmp_len) 421 return -EINVAL; 422 423 if (up->replay_window > up->bmp_len * sizeof(__u32) * 8) 424 return -EINVAL; 425 426 return 0; 427 } 428 429 static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn, 430 struct xfrm_replay_state_esn **preplay_esn, 431 struct nlattr *rta) 432 { 433 struct xfrm_replay_state_esn *p, *pp, *up; 434 unsigned int klen, ulen; 435 436 if (!rta) 437 return 0; 438 439 up = nla_data(rta); 440 klen = xfrm_replay_state_esn_len(up); 441 ulen = nla_len(rta) >= (int)klen ? klen : sizeof(*up); 442 443 p = kzalloc(klen, GFP_KERNEL); 444 if (!p) 445 return -ENOMEM; 446 447 pp = kzalloc(klen, GFP_KERNEL); 448 if (!pp) { 449 kfree(p); 450 return -ENOMEM; 451 } 452 453 memcpy(p, up, ulen); 454 memcpy(pp, up, ulen); 455 456 *replay_esn = p; 457 *preplay_esn = pp; 458 459 return 0; 460 } 461 462 static inline unsigned int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx) 463 { 464 unsigned int len = 0; 465 466 if (xfrm_ctx) { 467 len += sizeof(struct xfrm_user_sec_ctx); 468 len += xfrm_ctx->ctx_len; 469 } 470 return len; 471 } 472 473 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p) 474 { 475 memcpy(&x->id, &p->id, sizeof(x->id)); 476 memcpy(&x->sel, &p->sel, sizeof(x->sel)); 477 memcpy(&x->lft, &p->lft, sizeof(x->lft)); 478 x->props.mode = p->mode; 479 x->props.replay_window = min_t(unsigned int, p->replay_window, 480 sizeof(x->replay.bitmap) * 8); 481 x->props.reqid = p->reqid; 482 x->props.family = p->family; 483 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr)); 484 x->props.flags = p->flags; 485 486 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC)) 487 x->sel.family = p->family; 488 } 489 490 /* 491 * someday when pfkey also has support, we could have the code 492 * somehow made shareable and move it to xfrm_state.c - JHS 493 * 494 */ 495 static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs, 496 int update_esn) 497 { 498 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL]; 499 struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL; 500 struct nlattr *lt = attrs[XFRMA_LTIME_VAL]; 501 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH]; 502 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH]; 503 504 if (re) { 505 struct xfrm_replay_state_esn *replay_esn; 506 replay_esn = nla_data(re); 507 memcpy(x->replay_esn, replay_esn, 508 xfrm_replay_state_esn_len(replay_esn)); 509 memcpy(x->preplay_esn, replay_esn, 510 xfrm_replay_state_esn_len(replay_esn)); 511 } 512 513 if (rp) { 514 struct xfrm_replay_state *replay; 515 replay = nla_data(rp); 516 memcpy(&x->replay, replay, sizeof(*replay)); 517 memcpy(&x->preplay, replay, sizeof(*replay)); 518 } 519 520 if (lt) { 521 struct xfrm_lifetime_cur *ltime; 522 ltime = nla_data(lt); 523 x->curlft.bytes = ltime->bytes; 524 x->curlft.packets = ltime->packets; 525 x->curlft.add_time = ltime->add_time; 526 x->curlft.use_time = ltime->use_time; 527 } 528 529 if (et) 530 x->replay_maxage = nla_get_u32(et); 531 532 if (rt) 533 x->replay_maxdiff = nla_get_u32(rt); 534 } 535 536 static void xfrm_smark_init(struct nlattr **attrs, struct xfrm_mark *m) 537 { 538 if (attrs[XFRMA_SET_MARK]) { 539 m->v = nla_get_u32(attrs[XFRMA_SET_MARK]); 540 if (attrs[XFRMA_SET_MARK_MASK]) 541 m->m = nla_get_u32(attrs[XFRMA_SET_MARK_MASK]); 542 else 543 m->m = 0xffffffff; 544 } else { 545 m->v = m->m = 0; 546 } 547 } 548 549 static struct xfrm_state *xfrm_state_construct(struct net *net, 550 struct xfrm_usersa_info *p, 551 struct nlattr **attrs, 552 int *errp) 553 { 554 struct xfrm_state *x = xfrm_state_alloc(net); 555 int err = -ENOMEM; 556 557 if (!x) 558 goto error_no_put; 559 560 copy_from_user_state(x, p); 561 562 if (attrs[XFRMA_SA_EXTRA_FLAGS]) 563 x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]); 564 565 if ((err = attach_aead(x, attrs[XFRMA_ALG_AEAD]))) 566 goto error; 567 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo, 568 attrs[XFRMA_ALG_AUTH_TRUNC]))) 569 goto error; 570 if (!x->props.aalgo) { 571 if ((err = attach_auth(&x->aalg, &x->props.aalgo, 572 attrs[XFRMA_ALG_AUTH]))) 573 goto error; 574 } 575 if ((err = attach_crypt(x, attrs[XFRMA_ALG_CRYPT]))) 576 goto error; 577 if ((err = attach_one_algo(&x->calg, &x->props.calgo, 578 xfrm_calg_get_byname, 579 attrs[XFRMA_ALG_COMP]))) 580 goto error; 581 582 if (attrs[XFRMA_ENCAP]) { 583 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]), 584 sizeof(*x->encap), GFP_KERNEL); 585 if (x->encap == NULL) 586 goto error; 587 } 588 589 if (attrs[XFRMA_TFCPAD]) 590 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]); 591 592 if (attrs[XFRMA_COADDR]) { 593 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]), 594 sizeof(*x->coaddr), GFP_KERNEL); 595 if (x->coaddr == NULL) 596 goto error; 597 } 598 599 xfrm_mark_get(attrs, &x->mark); 600 601 xfrm_smark_init(attrs, &x->props.smark); 602 603 if (attrs[XFRMA_IF_ID]) 604 x->if_id = nla_get_u32(attrs[XFRMA_IF_ID]); 605 606 err = __xfrm_init_state(x, false, attrs[XFRMA_OFFLOAD_DEV]); 607 if (err) 608 goto error; 609 610 if (attrs[XFRMA_SEC_CTX]) { 611 err = security_xfrm_state_alloc(x, 612 nla_data(attrs[XFRMA_SEC_CTX])); 613 if (err) 614 goto error; 615 } 616 617 if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn, 618 attrs[XFRMA_REPLAY_ESN_VAL]))) 619 goto error; 620 621 x->km.seq = p->seq; 622 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth; 623 /* sysctl_xfrm_aevent_etime is in 100ms units */ 624 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M; 625 626 if ((err = xfrm_init_replay(x))) 627 goto error; 628 629 /* override default values from above */ 630 xfrm_update_ae_params(x, attrs, 0); 631 632 /* configure the hardware if offload is requested */ 633 if (attrs[XFRMA_OFFLOAD_DEV]) { 634 err = xfrm_dev_state_add(net, x, 635 nla_data(attrs[XFRMA_OFFLOAD_DEV])); 636 if (err) 637 goto error; 638 } 639 640 return x; 641 642 error: 643 x->km.state = XFRM_STATE_DEAD; 644 xfrm_state_put(x); 645 error_no_put: 646 *errp = err; 647 return NULL; 648 } 649 650 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 651 struct nlattr **attrs) 652 { 653 struct net *net = sock_net(skb->sk); 654 struct xfrm_usersa_info *p = nlmsg_data(nlh); 655 struct xfrm_state *x; 656 int err; 657 struct km_event c; 658 659 err = verify_newsa_info(p, attrs); 660 if (err) 661 return err; 662 663 x = xfrm_state_construct(net, p, attrs, &err); 664 if (!x) 665 return err; 666 667 xfrm_state_hold(x); 668 if (nlh->nlmsg_type == XFRM_MSG_NEWSA) 669 err = xfrm_state_add(x); 670 else 671 err = xfrm_state_update(x); 672 673 xfrm_audit_state_add(x, err ? 0 : 1, true); 674 675 if (err < 0) { 676 x->km.state = XFRM_STATE_DEAD; 677 xfrm_dev_state_delete(x); 678 __xfrm_state_put(x); 679 goto out; 680 } 681 682 if (x->km.state == XFRM_STATE_VOID) 683 x->km.state = XFRM_STATE_VALID; 684 685 c.seq = nlh->nlmsg_seq; 686 c.portid = nlh->nlmsg_pid; 687 c.event = nlh->nlmsg_type; 688 689 km_state_notify(x, &c); 690 out: 691 xfrm_state_put(x); 692 return err; 693 } 694 695 static struct xfrm_state *xfrm_user_state_lookup(struct net *net, 696 struct xfrm_usersa_id *p, 697 struct nlattr **attrs, 698 int *errp) 699 { 700 struct xfrm_state *x = NULL; 701 struct xfrm_mark m; 702 int err; 703 u32 mark = xfrm_mark_get(attrs, &m); 704 705 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) { 706 err = -ESRCH; 707 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family); 708 } else { 709 xfrm_address_t *saddr = NULL; 710 711 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr); 712 if (!saddr) { 713 err = -EINVAL; 714 goto out; 715 } 716 717 err = -ESRCH; 718 x = xfrm_state_lookup_byaddr(net, mark, 719 &p->daddr, saddr, 720 p->proto, p->family); 721 } 722 723 out: 724 if (!x && errp) 725 *errp = err; 726 return x; 727 } 728 729 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 730 struct nlattr **attrs) 731 { 732 struct net *net = sock_net(skb->sk); 733 struct xfrm_state *x; 734 int err = -ESRCH; 735 struct km_event c; 736 struct xfrm_usersa_id *p = nlmsg_data(nlh); 737 738 x = xfrm_user_state_lookup(net, p, attrs, &err); 739 if (x == NULL) 740 return err; 741 742 if ((err = security_xfrm_state_delete(x)) != 0) 743 goto out; 744 745 if (xfrm_state_kern(x)) { 746 err = -EPERM; 747 goto out; 748 } 749 750 err = xfrm_state_delete(x); 751 752 if (err < 0) 753 goto out; 754 755 c.seq = nlh->nlmsg_seq; 756 c.portid = nlh->nlmsg_pid; 757 c.event = nlh->nlmsg_type; 758 km_state_notify(x, &c); 759 760 out: 761 xfrm_audit_state_delete(x, err ? 0 : 1, true); 762 xfrm_state_put(x); 763 return err; 764 } 765 766 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p) 767 { 768 memset(p, 0, sizeof(*p)); 769 memcpy(&p->id, &x->id, sizeof(p->id)); 770 memcpy(&p->sel, &x->sel, sizeof(p->sel)); 771 memcpy(&p->lft, &x->lft, sizeof(p->lft)); 772 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft)); 773 put_unaligned(x->stats.replay_window, &p->stats.replay_window); 774 put_unaligned(x->stats.replay, &p->stats.replay); 775 put_unaligned(x->stats.integrity_failed, &p->stats.integrity_failed); 776 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr)); 777 p->mode = x->props.mode; 778 p->replay_window = x->props.replay_window; 779 p->reqid = x->props.reqid; 780 p->family = x->props.family; 781 p->flags = x->props.flags; 782 p->seq = x->km.seq; 783 } 784 785 struct xfrm_dump_info { 786 struct sk_buff *in_skb; 787 struct sk_buff *out_skb; 788 u32 nlmsg_seq; 789 u16 nlmsg_flags; 790 }; 791 792 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb) 793 { 794 struct xfrm_user_sec_ctx *uctx; 795 struct nlattr *attr; 796 int ctx_size = sizeof(*uctx) + s->ctx_len; 797 798 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size); 799 if (attr == NULL) 800 return -EMSGSIZE; 801 802 uctx = nla_data(attr); 803 uctx->exttype = XFRMA_SEC_CTX; 804 uctx->len = ctx_size; 805 uctx->ctx_doi = s->ctx_doi; 806 uctx->ctx_alg = s->ctx_alg; 807 uctx->ctx_len = s->ctx_len; 808 memcpy(uctx + 1, s->ctx_str, s->ctx_len); 809 810 return 0; 811 } 812 813 static int copy_user_offload(struct xfrm_state_offload *xso, struct sk_buff *skb) 814 { 815 struct xfrm_user_offload *xuo; 816 struct nlattr *attr; 817 818 attr = nla_reserve(skb, XFRMA_OFFLOAD_DEV, sizeof(*xuo)); 819 if (attr == NULL) 820 return -EMSGSIZE; 821 822 xuo = nla_data(attr); 823 memset(xuo, 0, sizeof(*xuo)); 824 xuo->ifindex = xso->dev->ifindex; 825 xuo->flags = xso->flags; 826 827 return 0; 828 } 829 830 static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb) 831 { 832 struct xfrm_algo *algo; 833 struct nlattr *nla; 834 835 nla = nla_reserve(skb, XFRMA_ALG_AUTH, 836 sizeof(*algo) + (auth->alg_key_len + 7) / 8); 837 if (!nla) 838 return -EMSGSIZE; 839 840 algo = nla_data(nla); 841 strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name)); 842 memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8); 843 algo->alg_key_len = auth->alg_key_len; 844 845 return 0; 846 } 847 848 static int xfrm_smark_put(struct sk_buff *skb, struct xfrm_mark *m) 849 { 850 int ret = 0; 851 852 if (m->v | m->m) { 853 ret = nla_put_u32(skb, XFRMA_SET_MARK, m->v); 854 if (!ret) 855 ret = nla_put_u32(skb, XFRMA_SET_MARK_MASK, m->m); 856 } 857 return ret; 858 } 859 860 /* Don't change this without updating xfrm_sa_len! */ 861 static int copy_to_user_state_extra(struct xfrm_state *x, 862 struct xfrm_usersa_info *p, 863 struct sk_buff *skb) 864 { 865 int ret = 0; 866 867 copy_to_user_state(x, p); 868 869 if (x->props.extra_flags) { 870 ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS, 871 x->props.extra_flags); 872 if (ret) 873 goto out; 874 } 875 876 if (x->coaddr) { 877 ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr); 878 if (ret) 879 goto out; 880 } 881 if (x->lastused) { 882 ret = nla_put_u64_64bit(skb, XFRMA_LASTUSED, x->lastused, 883 XFRMA_PAD); 884 if (ret) 885 goto out; 886 } 887 if (x->aead) { 888 ret = nla_put(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead); 889 if (ret) 890 goto out; 891 } 892 if (x->aalg) { 893 ret = copy_to_user_auth(x->aalg, skb); 894 if (!ret) 895 ret = nla_put(skb, XFRMA_ALG_AUTH_TRUNC, 896 xfrm_alg_auth_len(x->aalg), x->aalg); 897 if (ret) 898 goto out; 899 } 900 if (x->ealg) { 901 ret = nla_put(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg); 902 if (ret) 903 goto out; 904 } 905 if (x->calg) { 906 ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg); 907 if (ret) 908 goto out; 909 } 910 if (x->encap) { 911 ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap); 912 if (ret) 913 goto out; 914 } 915 if (x->tfcpad) { 916 ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad); 917 if (ret) 918 goto out; 919 } 920 ret = xfrm_mark_put(skb, &x->mark); 921 if (ret) 922 goto out; 923 924 ret = xfrm_smark_put(skb, &x->props.smark); 925 if (ret) 926 goto out; 927 928 if (x->replay_esn) 929 ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL, 930 xfrm_replay_state_esn_len(x->replay_esn), 931 x->replay_esn); 932 else 933 ret = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), 934 &x->replay); 935 if (ret) 936 goto out; 937 if(x->xso.dev) 938 ret = copy_user_offload(&x->xso, skb); 939 if (ret) 940 goto out; 941 if (x->if_id) { 942 ret = nla_put_u32(skb, XFRMA_IF_ID, x->if_id); 943 if (ret) 944 goto out; 945 } 946 if (x->security) 947 ret = copy_sec_ctx(x->security, skb); 948 out: 949 return ret; 950 } 951 952 static int dump_one_state(struct xfrm_state *x, int count, void *ptr) 953 { 954 struct xfrm_dump_info *sp = ptr; 955 struct sk_buff *in_skb = sp->in_skb; 956 struct sk_buff *skb = sp->out_skb; 957 struct xfrm_usersa_info *p; 958 struct nlmsghdr *nlh; 959 int err; 960 961 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq, 962 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags); 963 if (nlh == NULL) 964 return -EMSGSIZE; 965 966 p = nlmsg_data(nlh); 967 968 err = copy_to_user_state_extra(x, p, skb); 969 if (err) { 970 nlmsg_cancel(skb, nlh); 971 return err; 972 } 973 nlmsg_end(skb, nlh); 974 return 0; 975 } 976 977 static int xfrm_dump_sa_done(struct netlink_callback *cb) 978 { 979 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1]; 980 struct sock *sk = cb->skb->sk; 981 struct net *net = sock_net(sk); 982 983 if (cb->args[0]) 984 xfrm_state_walk_done(walk, net); 985 return 0; 986 } 987 988 static const struct nla_policy xfrma_policy[XFRMA_MAX+1]; 989 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb) 990 { 991 struct net *net = sock_net(skb->sk); 992 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1]; 993 struct xfrm_dump_info info; 994 995 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) > 996 sizeof(cb->args) - sizeof(cb->args[0])); 997 998 info.in_skb = cb->skb; 999 info.out_skb = skb; 1000 info.nlmsg_seq = cb->nlh->nlmsg_seq; 1001 info.nlmsg_flags = NLM_F_MULTI; 1002 1003 if (!cb->args[0]) { 1004 struct nlattr *attrs[XFRMA_MAX+1]; 1005 struct xfrm_address_filter *filter = NULL; 1006 u8 proto = 0; 1007 int err; 1008 1009 err = nlmsg_parse(cb->nlh, 0, attrs, XFRMA_MAX, xfrma_policy, 1010 cb->extack); 1011 if (err < 0) 1012 return err; 1013 1014 if (attrs[XFRMA_ADDRESS_FILTER]) { 1015 filter = kmemdup(nla_data(attrs[XFRMA_ADDRESS_FILTER]), 1016 sizeof(*filter), GFP_KERNEL); 1017 if (filter == NULL) 1018 return -ENOMEM; 1019 } 1020 1021 if (attrs[XFRMA_PROTO]) 1022 proto = nla_get_u8(attrs[XFRMA_PROTO]); 1023 1024 xfrm_state_walk_init(walk, proto, filter); 1025 cb->args[0] = 1; 1026 } 1027 1028 (void) xfrm_state_walk(net, walk, dump_one_state, &info); 1029 1030 return skb->len; 1031 } 1032 1033 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb, 1034 struct xfrm_state *x, u32 seq) 1035 { 1036 struct xfrm_dump_info info; 1037 struct sk_buff *skb; 1038 int err; 1039 1040 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 1041 if (!skb) 1042 return ERR_PTR(-ENOMEM); 1043 1044 info.in_skb = in_skb; 1045 info.out_skb = skb; 1046 info.nlmsg_seq = seq; 1047 info.nlmsg_flags = 0; 1048 1049 err = dump_one_state(x, 0, &info); 1050 if (err) { 1051 kfree_skb(skb); 1052 return ERR_PTR(err); 1053 } 1054 1055 return skb; 1056 } 1057 1058 /* A wrapper for nlmsg_multicast() checking that nlsk is still available. 1059 * Must be called with RCU read lock. 1060 */ 1061 static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb, 1062 u32 pid, unsigned int group) 1063 { 1064 struct sock *nlsk = rcu_dereference(net->xfrm.nlsk); 1065 1066 if (!nlsk) { 1067 kfree_skb(skb); 1068 return -EPIPE; 1069 } 1070 1071 return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC); 1072 } 1073 1074 static inline unsigned int xfrm_spdinfo_msgsize(void) 1075 { 1076 return NLMSG_ALIGN(4) 1077 + nla_total_size(sizeof(struct xfrmu_spdinfo)) 1078 + nla_total_size(sizeof(struct xfrmu_spdhinfo)) 1079 + nla_total_size(sizeof(struct xfrmu_spdhthresh)) 1080 + nla_total_size(sizeof(struct xfrmu_spdhthresh)); 1081 } 1082 1083 static int build_spdinfo(struct sk_buff *skb, struct net *net, 1084 u32 portid, u32 seq, u32 flags) 1085 { 1086 struct xfrmk_spdinfo si; 1087 struct xfrmu_spdinfo spc; 1088 struct xfrmu_spdhinfo sph; 1089 struct xfrmu_spdhthresh spt4, spt6; 1090 struct nlmsghdr *nlh; 1091 int err; 1092 u32 *f; 1093 unsigned lseq; 1094 1095 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0); 1096 if (nlh == NULL) /* shouldn't really happen ... */ 1097 return -EMSGSIZE; 1098 1099 f = nlmsg_data(nlh); 1100 *f = flags; 1101 xfrm_spd_getinfo(net, &si); 1102 spc.incnt = si.incnt; 1103 spc.outcnt = si.outcnt; 1104 spc.fwdcnt = si.fwdcnt; 1105 spc.inscnt = si.inscnt; 1106 spc.outscnt = si.outscnt; 1107 spc.fwdscnt = si.fwdscnt; 1108 sph.spdhcnt = si.spdhcnt; 1109 sph.spdhmcnt = si.spdhmcnt; 1110 1111 do { 1112 lseq = read_seqbegin(&net->xfrm.policy_hthresh.lock); 1113 1114 spt4.lbits = net->xfrm.policy_hthresh.lbits4; 1115 spt4.rbits = net->xfrm.policy_hthresh.rbits4; 1116 spt6.lbits = net->xfrm.policy_hthresh.lbits6; 1117 spt6.rbits = net->xfrm.policy_hthresh.rbits6; 1118 } while (read_seqretry(&net->xfrm.policy_hthresh.lock, lseq)); 1119 1120 err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc); 1121 if (!err) 1122 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph); 1123 if (!err) 1124 err = nla_put(skb, XFRMA_SPD_IPV4_HTHRESH, sizeof(spt4), &spt4); 1125 if (!err) 1126 err = nla_put(skb, XFRMA_SPD_IPV6_HTHRESH, sizeof(spt6), &spt6); 1127 if (err) { 1128 nlmsg_cancel(skb, nlh); 1129 return err; 1130 } 1131 1132 nlmsg_end(skb, nlh); 1133 return 0; 1134 } 1135 1136 static int xfrm_set_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh, 1137 struct nlattr **attrs) 1138 { 1139 struct net *net = sock_net(skb->sk); 1140 struct xfrmu_spdhthresh *thresh4 = NULL; 1141 struct xfrmu_spdhthresh *thresh6 = NULL; 1142 1143 /* selector prefixlen thresholds to hash policies */ 1144 if (attrs[XFRMA_SPD_IPV4_HTHRESH]) { 1145 struct nlattr *rta = attrs[XFRMA_SPD_IPV4_HTHRESH]; 1146 1147 if (nla_len(rta) < sizeof(*thresh4)) 1148 return -EINVAL; 1149 thresh4 = nla_data(rta); 1150 if (thresh4->lbits > 32 || thresh4->rbits > 32) 1151 return -EINVAL; 1152 } 1153 if (attrs[XFRMA_SPD_IPV6_HTHRESH]) { 1154 struct nlattr *rta = attrs[XFRMA_SPD_IPV6_HTHRESH]; 1155 1156 if (nla_len(rta) < sizeof(*thresh6)) 1157 return -EINVAL; 1158 thresh6 = nla_data(rta); 1159 if (thresh6->lbits > 128 || thresh6->rbits > 128) 1160 return -EINVAL; 1161 } 1162 1163 if (thresh4 || thresh6) { 1164 write_seqlock(&net->xfrm.policy_hthresh.lock); 1165 if (thresh4) { 1166 net->xfrm.policy_hthresh.lbits4 = thresh4->lbits; 1167 net->xfrm.policy_hthresh.rbits4 = thresh4->rbits; 1168 } 1169 if (thresh6) { 1170 net->xfrm.policy_hthresh.lbits6 = thresh6->lbits; 1171 net->xfrm.policy_hthresh.rbits6 = thresh6->rbits; 1172 } 1173 write_sequnlock(&net->xfrm.policy_hthresh.lock); 1174 1175 xfrm_policy_hash_rebuild(net); 1176 } 1177 1178 return 0; 1179 } 1180 1181 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh, 1182 struct nlattr **attrs) 1183 { 1184 struct net *net = sock_net(skb->sk); 1185 struct sk_buff *r_skb; 1186 u32 *flags = nlmsg_data(nlh); 1187 u32 sportid = NETLINK_CB(skb).portid; 1188 u32 seq = nlh->nlmsg_seq; 1189 int err; 1190 1191 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC); 1192 if (r_skb == NULL) 1193 return -ENOMEM; 1194 1195 err = build_spdinfo(r_skb, net, sportid, seq, *flags); 1196 BUG_ON(err < 0); 1197 1198 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid); 1199 } 1200 1201 static inline unsigned int xfrm_sadinfo_msgsize(void) 1202 { 1203 return NLMSG_ALIGN(4) 1204 + nla_total_size(sizeof(struct xfrmu_sadhinfo)) 1205 + nla_total_size(4); /* XFRMA_SAD_CNT */ 1206 } 1207 1208 static int build_sadinfo(struct sk_buff *skb, struct net *net, 1209 u32 portid, u32 seq, u32 flags) 1210 { 1211 struct xfrmk_sadinfo si; 1212 struct xfrmu_sadhinfo sh; 1213 struct nlmsghdr *nlh; 1214 int err; 1215 u32 *f; 1216 1217 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0); 1218 if (nlh == NULL) /* shouldn't really happen ... */ 1219 return -EMSGSIZE; 1220 1221 f = nlmsg_data(nlh); 1222 *f = flags; 1223 xfrm_sad_getinfo(net, &si); 1224 1225 sh.sadhmcnt = si.sadhmcnt; 1226 sh.sadhcnt = si.sadhcnt; 1227 1228 err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt); 1229 if (!err) 1230 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh); 1231 if (err) { 1232 nlmsg_cancel(skb, nlh); 1233 return err; 1234 } 1235 1236 nlmsg_end(skb, nlh); 1237 return 0; 1238 } 1239 1240 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh, 1241 struct nlattr **attrs) 1242 { 1243 struct net *net = sock_net(skb->sk); 1244 struct sk_buff *r_skb; 1245 u32 *flags = nlmsg_data(nlh); 1246 u32 sportid = NETLINK_CB(skb).portid; 1247 u32 seq = nlh->nlmsg_seq; 1248 int err; 1249 1250 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC); 1251 if (r_skb == NULL) 1252 return -ENOMEM; 1253 1254 err = build_sadinfo(r_skb, net, sportid, seq, *flags); 1255 BUG_ON(err < 0); 1256 1257 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid); 1258 } 1259 1260 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 1261 struct nlattr **attrs) 1262 { 1263 struct net *net = sock_net(skb->sk); 1264 struct xfrm_usersa_id *p = nlmsg_data(nlh); 1265 struct xfrm_state *x; 1266 struct sk_buff *resp_skb; 1267 int err = -ESRCH; 1268 1269 x = xfrm_user_state_lookup(net, p, attrs, &err); 1270 if (x == NULL) 1271 goto out_noput; 1272 1273 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); 1274 if (IS_ERR(resp_skb)) { 1275 err = PTR_ERR(resp_skb); 1276 } else { 1277 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid); 1278 } 1279 xfrm_state_put(x); 1280 out_noput: 1281 return err; 1282 } 1283 1284 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh, 1285 struct nlattr **attrs) 1286 { 1287 struct net *net = sock_net(skb->sk); 1288 struct xfrm_state *x; 1289 struct xfrm_userspi_info *p; 1290 struct sk_buff *resp_skb; 1291 xfrm_address_t *daddr; 1292 int family; 1293 int err; 1294 u32 mark; 1295 struct xfrm_mark m; 1296 u32 if_id = 0; 1297 1298 p = nlmsg_data(nlh); 1299 err = verify_spi_info(p->info.id.proto, p->min, p->max); 1300 if (err) 1301 goto out_noput; 1302 1303 family = p->info.family; 1304 daddr = &p->info.id.daddr; 1305 1306 x = NULL; 1307 1308 mark = xfrm_mark_get(attrs, &m); 1309 1310 if (attrs[XFRMA_IF_ID]) 1311 if_id = nla_get_u32(attrs[XFRMA_IF_ID]); 1312 1313 if (p->info.seq) { 1314 x = xfrm_find_acq_byseq(net, mark, p->info.seq); 1315 if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) { 1316 xfrm_state_put(x); 1317 x = NULL; 1318 } 1319 } 1320 1321 if (!x) 1322 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid, 1323 if_id, p->info.id.proto, daddr, 1324 &p->info.saddr, 1, 1325 family); 1326 err = -ENOENT; 1327 if (x == NULL) 1328 goto out_noput; 1329 1330 err = xfrm_alloc_spi(x, p->min, p->max); 1331 if (err) 1332 goto out; 1333 1334 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); 1335 if (IS_ERR(resp_skb)) { 1336 err = PTR_ERR(resp_skb); 1337 goto out; 1338 } 1339 1340 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid); 1341 1342 out: 1343 xfrm_state_put(x); 1344 out_noput: 1345 return err; 1346 } 1347 1348 static int verify_policy_dir(u8 dir) 1349 { 1350 switch (dir) { 1351 case XFRM_POLICY_IN: 1352 case XFRM_POLICY_OUT: 1353 case XFRM_POLICY_FWD: 1354 break; 1355 1356 default: 1357 return -EINVAL; 1358 } 1359 1360 return 0; 1361 } 1362 1363 static int verify_policy_type(u8 type) 1364 { 1365 switch (type) { 1366 case XFRM_POLICY_TYPE_MAIN: 1367 #ifdef CONFIG_XFRM_SUB_POLICY 1368 case XFRM_POLICY_TYPE_SUB: 1369 #endif 1370 break; 1371 1372 default: 1373 return -EINVAL; 1374 } 1375 1376 return 0; 1377 } 1378 1379 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p) 1380 { 1381 int ret; 1382 1383 switch (p->share) { 1384 case XFRM_SHARE_ANY: 1385 case XFRM_SHARE_SESSION: 1386 case XFRM_SHARE_USER: 1387 case XFRM_SHARE_UNIQUE: 1388 break; 1389 1390 default: 1391 return -EINVAL; 1392 } 1393 1394 switch (p->action) { 1395 case XFRM_POLICY_ALLOW: 1396 case XFRM_POLICY_BLOCK: 1397 break; 1398 1399 default: 1400 return -EINVAL; 1401 } 1402 1403 switch (p->sel.family) { 1404 case AF_INET: 1405 if (p->sel.prefixlen_d > 32 || p->sel.prefixlen_s > 32) 1406 return -EINVAL; 1407 1408 break; 1409 1410 case AF_INET6: 1411 #if IS_ENABLED(CONFIG_IPV6) 1412 if (p->sel.prefixlen_d > 128 || p->sel.prefixlen_s > 128) 1413 return -EINVAL; 1414 1415 break; 1416 #else 1417 return -EAFNOSUPPORT; 1418 #endif 1419 1420 default: 1421 return -EINVAL; 1422 } 1423 1424 ret = verify_policy_dir(p->dir); 1425 if (ret) 1426 return ret; 1427 if (p->index && ((p->index & XFRM_POLICY_MAX) != p->dir)) 1428 return -EINVAL; 1429 1430 return 0; 1431 } 1432 1433 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs) 1434 { 1435 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 1436 struct xfrm_user_sec_ctx *uctx; 1437 1438 if (!rt) 1439 return 0; 1440 1441 uctx = nla_data(rt); 1442 return security_xfrm_policy_alloc(&pol->security, uctx, GFP_KERNEL); 1443 } 1444 1445 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut, 1446 int nr) 1447 { 1448 int i; 1449 1450 xp->xfrm_nr = nr; 1451 for (i = 0; i < nr; i++, ut++) { 1452 struct xfrm_tmpl *t = &xp->xfrm_vec[i]; 1453 1454 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id)); 1455 memcpy(&t->saddr, &ut->saddr, 1456 sizeof(xfrm_address_t)); 1457 t->reqid = ut->reqid; 1458 t->mode = ut->mode; 1459 t->share = ut->share; 1460 t->optional = ut->optional; 1461 t->aalgos = ut->aalgos; 1462 t->ealgos = ut->ealgos; 1463 t->calgos = ut->calgos; 1464 /* If all masks are ~0, then we allow all algorithms. */ 1465 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos); 1466 t->encap_family = ut->family; 1467 } 1468 } 1469 1470 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family) 1471 { 1472 u16 prev_family; 1473 int i; 1474 1475 if (nr > XFRM_MAX_DEPTH) 1476 return -EINVAL; 1477 1478 prev_family = family; 1479 1480 for (i = 0; i < nr; i++) { 1481 /* We never validated the ut->family value, so many 1482 * applications simply leave it at zero. The check was 1483 * never made and ut->family was ignored because all 1484 * templates could be assumed to have the same family as 1485 * the policy itself. Now that we will have ipv4-in-ipv6 1486 * and ipv6-in-ipv4 tunnels, this is no longer true. 1487 */ 1488 if (!ut[i].family) 1489 ut[i].family = family; 1490 1491 switch (ut[i].mode) { 1492 case XFRM_MODE_TUNNEL: 1493 case XFRM_MODE_BEET: 1494 break; 1495 default: 1496 if (ut[i].family != prev_family) 1497 return -EINVAL; 1498 break; 1499 } 1500 if (ut[i].mode >= XFRM_MODE_MAX) 1501 return -EINVAL; 1502 1503 prev_family = ut[i].family; 1504 1505 switch (ut[i].family) { 1506 case AF_INET: 1507 break; 1508 #if IS_ENABLED(CONFIG_IPV6) 1509 case AF_INET6: 1510 break; 1511 #endif 1512 default: 1513 return -EINVAL; 1514 } 1515 1516 switch (ut[i].id.proto) { 1517 case IPPROTO_AH: 1518 case IPPROTO_ESP: 1519 case IPPROTO_COMP: 1520 #if IS_ENABLED(CONFIG_IPV6) 1521 case IPPROTO_ROUTING: 1522 case IPPROTO_DSTOPTS: 1523 #endif 1524 case IPSEC_PROTO_ANY: 1525 break; 1526 default: 1527 return -EINVAL; 1528 } 1529 1530 } 1531 1532 return 0; 1533 } 1534 1535 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs) 1536 { 1537 struct nlattr *rt = attrs[XFRMA_TMPL]; 1538 1539 if (!rt) { 1540 pol->xfrm_nr = 0; 1541 } else { 1542 struct xfrm_user_tmpl *utmpl = nla_data(rt); 1543 int nr = nla_len(rt) / sizeof(*utmpl); 1544 int err; 1545 1546 err = validate_tmpl(nr, utmpl, pol->family); 1547 if (err) 1548 return err; 1549 1550 copy_templates(pol, utmpl, nr); 1551 } 1552 return 0; 1553 } 1554 1555 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs) 1556 { 1557 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE]; 1558 struct xfrm_userpolicy_type *upt; 1559 u8 type = XFRM_POLICY_TYPE_MAIN; 1560 int err; 1561 1562 if (rt) { 1563 upt = nla_data(rt); 1564 type = upt->type; 1565 } 1566 1567 err = verify_policy_type(type); 1568 if (err) 1569 return err; 1570 1571 *tp = type; 1572 return 0; 1573 } 1574 1575 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p) 1576 { 1577 xp->priority = p->priority; 1578 xp->index = p->index; 1579 memcpy(&xp->selector, &p->sel, sizeof(xp->selector)); 1580 memcpy(&xp->lft, &p->lft, sizeof(xp->lft)); 1581 xp->action = p->action; 1582 xp->flags = p->flags; 1583 xp->family = p->sel.family; 1584 /* XXX xp->share = p->share; */ 1585 } 1586 1587 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir) 1588 { 1589 memset(p, 0, sizeof(*p)); 1590 memcpy(&p->sel, &xp->selector, sizeof(p->sel)); 1591 memcpy(&p->lft, &xp->lft, sizeof(p->lft)); 1592 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft)); 1593 p->priority = xp->priority; 1594 p->index = xp->index; 1595 p->sel.family = xp->family; 1596 p->dir = dir; 1597 p->action = xp->action; 1598 p->flags = xp->flags; 1599 p->share = XFRM_SHARE_ANY; /* XXX xp->share */ 1600 } 1601 1602 static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp) 1603 { 1604 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL); 1605 int err; 1606 1607 if (!xp) { 1608 *errp = -ENOMEM; 1609 return NULL; 1610 } 1611 1612 copy_from_user_policy(xp, p); 1613 1614 err = copy_from_user_policy_type(&xp->type, attrs); 1615 if (err) 1616 goto error; 1617 1618 if (!(err = copy_from_user_tmpl(xp, attrs))) 1619 err = copy_from_user_sec_ctx(xp, attrs); 1620 if (err) 1621 goto error; 1622 1623 xfrm_mark_get(attrs, &xp->mark); 1624 1625 if (attrs[XFRMA_IF_ID]) 1626 xp->if_id = nla_get_u32(attrs[XFRMA_IF_ID]); 1627 1628 return xp; 1629 error: 1630 *errp = err; 1631 xp->walk.dead = 1; 1632 xfrm_policy_destroy(xp); 1633 return NULL; 1634 } 1635 1636 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 1637 struct nlattr **attrs) 1638 { 1639 struct net *net = sock_net(skb->sk); 1640 struct xfrm_userpolicy_info *p = nlmsg_data(nlh); 1641 struct xfrm_policy *xp; 1642 struct km_event c; 1643 int err; 1644 int excl; 1645 1646 err = verify_newpolicy_info(p); 1647 if (err) 1648 return err; 1649 err = verify_sec_ctx_len(attrs); 1650 if (err) 1651 return err; 1652 1653 xp = xfrm_policy_construct(net, p, attrs, &err); 1654 if (!xp) 1655 return err; 1656 1657 /* shouldn't excl be based on nlh flags?? 1658 * Aha! this is anti-netlink really i.e more pfkey derived 1659 * in netlink excl is a flag and you wouldnt need 1660 * a type XFRM_MSG_UPDPOLICY - JHS */ 1661 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY; 1662 err = xfrm_policy_insert(p->dir, xp, excl); 1663 xfrm_audit_policy_add(xp, err ? 0 : 1, true); 1664 1665 if (err) { 1666 security_xfrm_policy_free(xp->security); 1667 kfree(xp); 1668 return err; 1669 } 1670 1671 c.event = nlh->nlmsg_type; 1672 c.seq = nlh->nlmsg_seq; 1673 c.portid = nlh->nlmsg_pid; 1674 km_policy_notify(xp, p->dir, &c); 1675 1676 xfrm_pol_put(xp); 1677 1678 return 0; 1679 } 1680 1681 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb) 1682 { 1683 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH]; 1684 int i; 1685 1686 if (xp->xfrm_nr == 0) 1687 return 0; 1688 1689 for (i = 0; i < xp->xfrm_nr; i++) { 1690 struct xfrm_user_tmpl *up = &vec[i]; 1691 struct xfrm_tmpl *kp = &xp->xfrm_vec[i]; 1692 1693 memset(up, 0, sizeof(*up)); 1694 memcpy(&up->id, &kp->id, sizeof(up->id)); 1695 up->family = kp->encap_family; 1696 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr)); 1697 up->reqid = kp->reqid; 1698 up->mode = kp->mode; 1699 up->share = kp->share; 1700 up->optional = kp->optional; 1701 up->aalgos = kp->aalgos; 1702 up->ealgos = kp->ealgos; 1703 up->calgos = kp->calgos; 1704 } 1705 1706 return nla_put(skb, XFRMA_TMPL, 1707 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec); 1708 } 1709 1710 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb) 1711 { 1712 if (x->security) { 1713 return copy_sec_ctx(x->security, skb); 1714 } 1715 return 0; 1716 } 1717 1718 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb) 1719 { 1720 if (xp->security) 1721 return copy_sec_ctx(xp->security, skb); 1722 return 0; 1723 } 1724 static inline unsigned int userpolicy_type_attrsize(void) 1725 { 1726 #ifdef CONFIG_XFRM_SUB_POLICY 1727 return nla_total_size(sizeof(struct xfrm_userpolicy_type)); 1728 #else 1729 return 0; 1730 #endif 1731 } 1732 1733 #ifdef CONFIG_XFRM_SUB_POLICY 1734 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb) 1735 { 1736 struct xfrm_userpolicy_type upt; 1737 1738 /* Sadly there are two holes in struct xfrm_userpolicy_type */ 1739 memset(&upt, 0, sizeof(upt)); 1740 upt.type = type; 1741 1742 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt); 1743 } 1744 1745 #else 1746 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb) 1747 { 1748 return 0; 1749 } 1750 #endif 1751 1752 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr) 1753 { 1754 struct xfrm_dump_info *sp = ptr; 1755 struct xfrm_userpolicy_info *p; 1756 struct sk_buff *in_skb = sp->in_skb; 1757 struct sk_buff *skb = sp->out_skb; 1758 struct nlmsghdr *nlh; 1759 int err; 1760 1761 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq, 1762 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags); 1763 if (nlh == NULL) 1764 return -EMSGSIZE; 1765 1766 p = nlmsg_data(nlh); 1767 copy_to_user_policy(xp, p, dir); 1768 err = copy_to_user_tmpl(xp, skb); 1769 if (!err) 1770 err = copy_to_user_sec_ctx(xp, skb); 1771 if (!err) 1772 err = copy_to_user_policy_type(xp->type, skb); 1773 if (!err) 1774 err = xfrm_mark_put(skb, &xp->mark); 1775 if (!err) 1776 err = xfrm_if_id_put(skb, xp->if_id); 1777 if (err) { 1778 nlmsg_cancel(skb, nlh); 1779 return err; 1780 } 1781 nlmsg_end(skb, nlh); 1782 return 0; 1783 } 1784 1785 static int xfrm_dump_policy_done(struct netlink_callback *cb) 1786 { 1787 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args; 1788 struct net *net = sock_net(cb->skb->sk); 1789 1790 xfrm_policy_walk_done(walk, net); 1791 return 0; 1792 } 1793 1794 static int xfrm_dump_policy_start(struct netlink_callback *cb) 1795 { 1796 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args; 1797 1798 BUILD_BUG_ON(sizeof(*walk) > sizeof(cb->args)); 1799 1800 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY); 1801 return 0; 1802 } 1803 1804 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb) 1805 { 1806 struct net *net = sock_net(skb->sk); 1807 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args; 1808 struct xfrm_dump_info info; 1809 1810 info.in_skb = cb->skb; 1811 info.out_skb = skb; 1812 info.nlmsg_seq = cb->nlh->nlmsg_seq; 1813 info.nlmsg_flags = NLM_F_MULTI; 1814 1815 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info); 1816 1817 return skb->len; 1818 } 1819 1820 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb, 1821 struct xfrm_policy *xp, 1822 int dir, u32 seq) 1823 { 1824 struct xfrm_dump_info info; 1825 struct sk_buff *skb; 1826 int err; 1827 1828 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1829 if (!skb) 1830 return ERR_PTR(-ENOMEM); 1831 1832 info.in_skb = in_skb; 1833 info.out_skb = skb; 1834 info.nlmsg_seq = seq; 1835 info.nlmsg_flags = 0; 1836 1837 err = dump_one_policy(xp, dir, 0, &info); 1838 if (err) { 1839 kfree_skb(skb); 1840 return ERR_PTR(err); 1841 } 1842 1843 return skb; 1844 } 1845 1846 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 1847 struct nlattr **attrs) 1848 { 1849 struct net *net = sock_net(skb->sk); 1850 struct xfrm_policy *xp; 1851 struct xfrm_userpolicy_id *p; 1852 u8 type = XFRM_POLICY_TYPE_MAIN; 1853 int err; 1854 struct km_event c; 1855 int delete; 1856 struct xfrm_mark m; 1857 u32 mark = xfrm_mark_get(attrs, &m); 1858 u32 if_id = 0; 1859 1860 p = nlmsg_data(nlh); 1861 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY; 1862 1863 err = copy_from_user_policy_type(&type, attrs); 1864 if (err) 1865 return err; 1866 1867 err = verify_policy_dir(p->dir); 1868 if (err) 1869 return err; 1870 1871 if (attrs[XFRMA_IF_ID]) 1872 if_id = nla_get_u32(attrs[XFRMA_IF_ID]); 1873 1874 if (p->index) 1875 xp = xfrm_policy_byid(net, mark, if_id, type, p->dir, p->index, delete, &err); 1876 else { 1877 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 1878 struct xfrm_sec_ctx *ctx; 1879 1880 err = verify_sec_ctx_len(attrs); 1881 if (err) 1882 return err; 1883 1884 ctx = NULL; 1885 if (rt) { 1886 struct xfrm_user_sec_ctx *uctx = nla_data(rt); 1887 1888 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL); 1889 if (err) 1890 return err; 1891 } 1892 xp = xfrm_policy_bysel_ctx(net, mark, if_id, type, p->dir, &p->sel, 1893 ctx, delete, &err); 1894 security_xfrm_policy_free(ctx); 1895 } 1896 if (xp == NULL) 1897 return -ENOENT; 1898 1899 if (!delete) { 1900 struct sk_buff *resp_skb; 1901 1902 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq); 1903 if (IS_ERR(resp_skb)) { 1904 err = PTR_ERR(resp_skb); 1905 } else { 1906 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, 1907 NETLINK_CB(skb).portid); 1908 } 1909 } else { 1910 xfrm_audit_policy_delete(xp, err ? 0 : 1, true); 1911 1912 if (err != 0) 1913 goto out; 1914 1915 c.data.byid = p->index; 1916 c.event = nlh->nlmsg_type; 1917 c.seq = nlh->nlmsg_seq; 1918 c.portid = nlh->nlmsg_pid; 1919 km_policy_notify(xp, p->dir, &c); 1920 } 1921 1922 out: 1923 xfrm_pol_put(xp); 1924 return err; 1925 } 1926 1927 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 1928 struct nlattr **attrs) 1929 { 1930 struct net *net = sock_net(skb->sk); 1931 struct km_event c; 1932 struct xfrm_usersa_flush *p = nlmsg_data(nlh); 1933 int err; 1934 1935 err = xfrm_state_flush(net, p->proto, true, false); 1936 if (err) { 1937 if (err == -ESRCH) /* empty table */ 1938 return 0; 1939 return err; 1940 } 1941 c.data.proto = p->proto; 1942 c.event = nlh->nlmsg_type; 1943 c.seq = nlh->nlmsg_seq; 1944 c.portid = nlh->nlmsg_pid; 1945 c.net = net; 1946 km_state_notify(NULL, &c); 1947 1948 return 0; 1949 } 1950 1951 static inline unsigned int xfrm_aevent_msgsize(struct xfrm_state *x) 1952 { 1953 unsigned int replay_size = x->replay_esn ? 1954 xfrm_replay_state_esn_len(x->replay_esn) : 1955 sizeof(struct xfrm_replay_state); 1956 1957 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id)) 1958 + nla_total_size(replay_size) 1959 + nla_total_size_64bit(sizeof(struct xfrm_lifetime_cur)) 1960 + nla_total_size(sizeof(struct xfrm_mark)) 1961 + nla_total_size(4) /* XFRM_AE_RTHR */ 1962 + nla_total_size(4); /* XFRM_AE_ETHR */ 1963 } 1964 1965 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c) 1966 { 1967 struct xfrm_aevent_id *id; 1968 struct nlmsghdr *nlh; 1969 int err; 1970 1971 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0); 1972 if (nlh == NULL) 1973 return -EMSGSIZE; 1974 1975 id = nlmsg_data(nlh); 1976 memset(&id->sa_id, 0, sizeof(id->sa_id)); 1977 memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr)); 1978 id->sa_id.spi = x->id.spi; 1979 id->sa_id.family = x->props.family; 1980 id->sa_id.proto = x->id.proto; 1981 memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr)); 1982 id->reqid = x->props.reqid; 1983 id->flags = c->data.aevent; 1984 1985 if (x->replay_esn) { 1986 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL, 1987 xfrm_replay_state_esn_len(x->replay_esn), 1988 x->replay_esn); 1989 } else { 1990 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), 1991 &x->replay); 1992 } 1993 if (err) 1994 goto out_cancel; 1995 err = nla_put_64bit(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft, 1996 XFRMA_PAD); 1997 if (err) 1998 goto out_cancel; 1999 2000 if (id->flags & XFRM_AE_RTHR) { 2001 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff); 2002 if (err) 2003 goto out_cancel; 2004 } 2005 if (id->flags & XFRM_AE_ETHR) { 2006 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH, 2007 x->replay_maxage * 10 / HZ); 2008 if (err) 2009 goto out_cancel; 2010 } 2011 err = xfrm_mark_put(skb, &x->mark); 2012 if (err) 2013 goto out_cancel; 2014 2015 err = xfrm_if_id_put(skb, x->if_id); 2016 if (err) 2017 goto out_cancel; 2018 2019 nlmsg_end(skb, nlh); 2020 return 0; 2021 2022 out_cancel: 2023 nlmsg_cancel(skb, nlh); 2024 return err; 2025 } 2026 2027 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh, 2028 struct nlattr **attrs) 2029 { 2030 struct net *net = sock_net(skb->sk); 2031 struct xfrm_state *x; 2032 struct sk_buff *r_skb; 2033 int err; 2034 struct km_event c; 2035 u32 mark; 2036 struct xfrm_mark m; 2037 struct xfrm_aevent_id *p = nlmsg_data(nlh); 2038 struct xfrm_usersa_id *id = &p->sa_id; 2039 2040 mark = xfrm_mark_get(attrs, &m); 2041 2042 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family); 2043 if (x == NULL) 2044 return -ESRCH; 2045 2046 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC); 2047 if (r_skb == NULL) { 2048 xfrm_state_put(x); 2049 return -ENOMEM; 2050 } 2051 2052 /* 2053 * XXX: is this lock really needed - none of the other 2054 * gets lock (the concern is things getting updated 2055 * while we are still reading) - jhs 2056 */ 2057 spin_lock_bh(&x->lock); 2058 c.data.aevent = p->flags; 2059 c.seq = nlh->nlmsg_seq; 2060 c.portid = nlh->nlmsg_pid; 2061 2062 err = build_aevent(r_skb, x, &c); 2063 BUG_ON(err < 0); 2064 2065 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid); 2066 spin_unlock_bh(&x->lock); 2067 xfrm_state_put(x); 2068 return err; 2069 } 2070 2071 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh, 2072 struct nlattr **attrs) 2073 { 2074 struct net *net = sock_net(skb->sk); 2075 struct xfrm_state *x; 2076 struct km_event c; 2077 int err = -EINVAL; 2078 u32 mark = 0; 2079 struct xfrm_mark m; 2080 struct xfrm_aevent_id *p = nlmsg_data(nlh); 2081 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL]; 2082 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL]; 2083 struct nlattr *lt = attrs[XFRMA_LTIME_VAL]; 2084 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH]; 2085 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH]; 2086 2087 if (!lt && !rp && !re && !et && !rt) 2088 return err; 2089 2090 /* pedantic mode - thou shalt sayeth replaceth */ 2091 if (!(nlh->nlmsg_flags&NLM_F_REPLACE)) 2092 return err; 2093 2094 mark = xfrm_mark_get(attrs, &m); 2095 2096 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family); 2097 if (x == NULL) 2098 return -ESRCH; 2099 2100 if (x->km.state != XFRM_STATE_VALID) 2101 goto out; 2102 2103 err = xfrm_replay_verify_len(x->replay_esn, re); 2104 if (err) 2105 goto out; 2106 2107 spin_lock_bh(&x->lock); 2108 xfrm_update_ae_params(x, attrs, 1); 2109 spin_unlock_bh(&x->lock); 2110 2111 c.event = nlh->nlmsg_type; 2112 c.seq = nlh->nlmsg_seq; 2113 c.portid = nlh->nlmsg_pid; 2114 c.data.aevent = XFRM_AE_CU; 2115 km_state_notify(x, &c); 2116 err = 0; 2117 out: 2118 xfrm_state_put(x); 2119 return err; 2120 } 2121 2122 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 2123 struct nlattr **attrs) 2124 { 2125 struct net *net = sock_net(skb->sk); 2126 struct km_event c; 2127 u8 type = XFRM_POLICY_TYPE_MAIN; 2128 int err; 2129 2130 err = copy_from_user_policy_type(&type, attrs); 2131 if (err) 2132 return err; 2133 2134 err = xfrm_policy_flush(net, type, true); 2135 if (err) { 2136 if (err == -ESRCH) /* empty table */ 2137 return 0; 2138 return err; 2139 } 2140 2141 c.data.type = type; 2142 c.event = nlh->nlmsg_type; 2143 c.seq = nlh->nlmsg_seq; 2144 c.portid = nlh->nlmsg_pid; 2145 c.net = net; 2146 km_policy_notify(NULL, 0, &c); 2147 return 0; 2148 } 2149 2150 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh, 2151 struct nlattr **attrs) 2152 { 2153 struct net *net = sock_net(skb->sk); 2154 struct xfrm_policy *xp; 2155 struct xfrm_user_polexpire *up = nlmsg_data(nlh); 2156 struct xfrm_userpolicy_info *p = &up->pol; 2157 u8 type = XFRM_POLICY_TYPE_MAIN; 2158 int err = -ENOENT; 2159 struct xfrm_mark m; 2160 u32 mark = xfrm_mark_get(attrs, &m); 2161 u32 if_id = 0; 2162 2163 err = copy_from_user_policy_type(&type, attrs); 2164 if (err) 2165 return err; 2166 2167 err = verify_policy_dir(p->dir); 2168 if (err) 2169 return err; 2170 2171 if (attrs[XFRMA_IF_ID]) 2172 if_id = nla_get_u32(attrs[XFRMA_IF_ID]); 2173 2174 if (p->index) 2175 xp = xfrm_policy_byid(net, mark, if_id, type, p->dir, p->index, 0, &err); 2176 else { 2177 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 2178 struct xfrm_sec_ctx *ctx; 2179 2180 err = verify_sec_ctx_len(attrs); 2181 if (err) 2182 return err; 2183 2184 ctx = NULL; 2185 if (rt) { 2186 struct xfrm_user_sec_ctx *uctx = nla_data(rt); 2187 2188 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL); 2189 if (err) 2190 return err; 2191 } 2192 xp = xfrm_policy_bysel_ctx(net, mark, if_id, type, p->dir, 2193 &p->sel, ctx, 0, &err); 2194 security_xfrm_policy_free(ctx); 2195 } 2196 if (xp == NULL) 2197 return -ENOENT; 2198 2199 if (unlikely(xp->walk.dead)) 2200 goto out; 2201 2202 err = 0; 2203 if (up->hard) { 2204 xfrm_policy_delete(xp, p->dir); 2205 xfrm_audit_policy_delete(xp, 1, true); 2206 } 2207 km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid); 2208 2209 out: 2210 xfrm_pol_put(xp); 2211 return err; 2212 } 2213 2214 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh, 2215 struct nlattr **attrs) 2216 { 2217 struct net *net = sock_net(skb->sk); 2218 struct xfrm_state *x; 2219 int err; 2220 struct xfrm_user_expire *ue = nlmsg_data(nlh); 2221 struct xfrm_usersa_info *p = &ue->state; 2222 struct xfrm_mark m; 2223 u32 mark = xfrm_mark_get(attrs, &m); 2224 2225 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family); 2226 2227 err = -ENOENT; 2228 if (x == NULL) 2229 return err; 2230 2231 spin_lock_bh(&x->lock); 2232 err = -EINVAL; 2233 if (x->km.state != XFRM_STATE_VALID) 2234 goto out; 2235 km_state_expired(x, ue->hard, nlh->nlmsg_pid); 2236 2237 if (ue->hard) { 2238 __xfrm_state_delete(x); 2239 xfrm_audit_state_delete(x, 1, true); 2240 } 2241 err = 0; 2242 out: 2243 spin_unlock_bh(&x->lock); 2244 xfrm_state_put(x); 2245 return err; 2246 } 2247 2248 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh, 2249 struct nlattr **attrs) 2250 { 2251 struct net *net = sock_net(skb->sk); 2252 struct xfrm_policy *xp; 2253 struct xfrm_user_tmpl *ut; 2254 int i; 2255 struct nlattr *rt = attrs[XFRMA_TMPL]; 2256 struct xfrm_mark mark; 2257 2258 struct xfrm_user_acquire *ua = nlmsg_data(nlh); 2259 struct xfrm_state *x = xfrm_state_alloc(net); 2260 int err = -ENOMEM; 2261 2262 if (!x) 2263 goto nomem; 2264 2265 xfrm_mark_get(attrs, &mark); 2266 2267 err = verify_newpolicy_info(&ua->policy); 2268 if (err) 2269 goto free_state; 2270 2271 /* build an XP */ 2272 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err); 2273 if (!xp) 2274 goto free_state; 2275 2276 memcpy(&x->id, &ua->id, sizeof(ua->id)); 2277 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr)); 2278 memcpy(&x->sel, &ua->sel, sizeof(ua->sel)); 2279 xp->mark.m = x->mark.m = mark.m; 2280 xp->mark.v = x->mark.v = mark.v; 2281 ut = nla_data(rt); 2282 /* extract the templates and for each call km_key */ 2283 for (i = 0; i < xp->xfrm_nr; i++, ut++) { 2284 struct xfrm_tmpl *t = &xp->xfrm_vec[i]; 2285 memcpy(&x->id, &t->id, sizeof(x->id)); 2286 x->props.mode = t->mode; 2287 x->props.reqid = t->reqid; 2288 x->props.family = ut->family; 2289 t->aalgos = ua->aalgos; 2290 t->ealgos = ua->ealgos; 2291 t->calgos = ua->calgos; 2292 err = km_query(x, t, xp); 2293 2294 } 2295 2296 xfrm_state_free(x); 2297 kfree(xp); 2298 2299 return 0; 2300 2301 free_state: 2302 xfrm_state_free(x); 2303 nomem: 2304 return err; 2305 } 2306 2307 #ifdef CONFIG_XFRM_MIGRATE 2308 static int copy_from_user_migrate(struct xfrm_migrate *ma, 2309 struct xfrm_kmaddress *k, 2310 struct nlattr **attrs, int *num) 2311 { 2312 struct nlattr *rt = attrs[XFRMA_MIGRATE]; 2313 struct xfrm_user_migrate *um; 2314 int i, num_migrate; 2315 2316 if (k != NULL) { 2317 struct xfrm_user_kmaddress *uk; 2318 2319 uk = nla_data(attrs[XFRMA_KMADDRESS]); 2320 memcpy(&k->local, &uk->local, sizeof(k->local)); 2321 memcpy(&k->remote, &uk->remote, sizeof(k->remote)); 2322 k->family = uk->family; 2323 k->reserved = uk->reserved; 2324 } 2325 2326 um = nla_data(rt); 2327 num_migrate = nla_len(rt) / sizeof(*um); 2328 2329 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH) 2330 return -EINVAL; 2331 2332 for (i = 0; i < num_migrate; i++, um++, ma++) { 2333 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr)); 2334 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr)); 2335 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr)); 2336 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr)); 2337 2338 ma->proto = um->proto; 2339 ma->mode = um->mode; 2340 ma->reqid = um->reqid; 2341 2342 ma->old_family = um->old_family; 2343 ma->new_family = um->new_family; 2344 } 2345 2346 *num = i; 2347 return 0; 2348 } 2349 2350 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh, 2351 struct nlattr **attrs) 2352 { 2353 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh); 2354 struct xfrm_migrate m[XFRM_MAX_DEPTH]; 2355 struct xfrm_kmaddress km, *kmp; 2356 u8 type; 2357 int err; 2358 int n = 0; 2359 struct net *net = sock_net(skb->sk); 2360 struct xfrm_encap_tmpl *encap = NULL; 2361 2362 if (attrs[XFRMA_MIGRATE] == NULL) 2363 return -EINVAL; 2364 2365 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL; 2366 2367 err = copy_from_user_policy_type(&type, attrs); 2368 if (err) 2369 return err; 2370 2371 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n); 2372 if (err) 2373 return err; 2374 2375 if (!n) 2376 return 0; 2377 2378 if (attrs[XFRMA_ENCAP]) { 2379 encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]), 2380 sizeof(*encap), GFP_KERNEL); 2381 if (!encap) 2382 return 0; 2383 } 2384 2385 err = xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net, encap); 2386 2387 kfree(encap); 2388 2389 return err; 2390 } 2391 #else 2392 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh, 2393 struct nlattr **attrs) 2394 { 2395 return -ENOPROTOOPT; 2396 } 2397 #endif 2398 2399 #ifdef CONFIG_XFRM_MIGRATE 2400 static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb) 2401 { 2402 struct xfrm_user_migrate um; 2403 2404 memset(&um, 0, sizeof(um)); 2405 um.proto = m->proto; 2406 um.mode = m->mode; 2407 um.reqid = m->reqid; 2408 um.old_family = m->old_family; 2409 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr)); 2410 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr)); 2411 um.new_family = m->new_family; 2412 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr)); 2413 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr)); 2414 2415 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um); 2416 } 2417 2418 static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb) 2419 { 2420 struct xfrm_user_kmaddress uk; 2421 2422 memset(&uk, 0, sizeof(uk)); 2423 uk.family = k->family; 2424 uk.reserved = k->reserved; 2425 memcpy(&uk.local, &k->local, sizeof(uk.local)); 2426 memcpy(&uk.remote, &k->remote, sizeof(uk.remote)); 2427 2428 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk); 2429 } 2430 2431 static inline unsigned int xfrm_migrate_msgsize(int num_migrate, int with_kma, 2432 int with_encp) 2433 { 2434 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id)) 2435 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0) 2436 + (with_encp ? nla_total_size(sizeof(struct xfrm_encap_tmpl)) : 0) 2437 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate) 2438 + userpolicy_type_attrsize(); 2439 } 2440 2441 static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m, 2442 int num_migrate, const struct xfrm_kmaddress *k, 2443 const struct xfrm_selector *sel, 2444 const struct xfrm_encap_tmpl *encap, u8 dir, u8 type) 2445 { 2446 const struct xfrm_migrate *mp; 2447 struct xfrm_userpolicy_id *pol_id; 2448 struct nlmsghdr *nlh; 2449 int i, err; 2450 2451 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0); 2452 if (nlh == NULL) 2453 return -EMSGSIZE; 2454 2455 pol_id = nlmsg_data(nlh); 2456 /* copy data from selector, dir, and type to the pol_id */ 2457 memset(pol_id, 0, sizeof(*pol_id)); 2458 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel)); 2459 pol_id->dir = dir; 2460 2461 if (k != NULL) { 2462 err = copy_to_user_kmaddress(k, skb); 2463 if (err) 2464 goto out_cancel; 2465 } 2466 if (encap) { 2467 err = nla_put(skb, XFRMA_ENCAP, sizeof(*encap), encap); 2468 if (err) 2469 goto out_cancel; 2470 } 2471 err = copy_to_user_policy_type(type, skb); 2472 if (err) 2473 goto out_cancel; 2474 for (i = 0, mp = m ; i < num_migrate; i++, mp++) { 2475 err = copy_to_user_migrate(mp, skb); 2476 if (err) 2477 goto out_cancel; 2478 } 2479 2480 nlmsg_end(skb, nlh); 2481 return 0; 2482 2483 out_cancel: 2484 nlmsg_cancel(skb, nlh); 2485 return err; 2486 } 2487 2488 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 2489 const struct xfrm_migrate *m, int num_migrate, 2490 const struct xfrm_kmaddress *k, 2491 const struct xfrm_encap_tmpl *encap) 2492 { 2493 struct net *net = &init_net; 2494 struct sk_buff *skb; 2495 int err; 2496 2497 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k, !!encap), 2498 GFP_ATOMIC); 2499 if (skb == NULL) 2500 return -ENOMEM; 2501 2502 /* build migrate */ 2503 err = build_migrate(skb, m, num_migrate, k, sel, encap, dir, type); 2504 BUG_ON(err < 0); 2505 2506 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE); 2507 } 2508 #else 2509 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 2510 const struct xfrm_migrate *m, int num_migrate, 2511 const struct xfrm_kmaddress *k, 2512 const struct xfrm_encap_tmpl *encap) 2513 { 2514 return -ENOPROTOOPT; 2515 } 2516 #endif 2517 2518 #define XMSGSIZE(type) sizeof(struct type) 2519 2520 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = { 2521 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), 2522 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), 2523 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), 2524 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), 2525 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 2526 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 2527 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info), 2528 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire), 2529 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire), 2530 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), 2531 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), 2532 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire), 2533 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush), 2534 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0, 2535 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), 2536 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), 2537 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report), 2538 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 2539 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32), 2540 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = sizeof(u32), 2541 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32), 2542 }; 2543 2544 #undef XMSGSIZE 2545 2546 static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = { 2547 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)}, 2548 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)}, 2549 [XFRMA_LASTUSED] = { .type = NLA_U64}, 2550 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)}, 2551 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) }, 2552 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) }, 2553 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) }, 2554 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) }, 2555 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) }, 2556 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) }, 2557 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) }, 2558 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) }, 2559 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) }, 2560 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 }, 2561 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 }, 2562 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) }, 2563 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) }, 2564 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)}, 2565 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) }, 2566 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) }, 2567 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) }, 2568 [XFRMA_TFCPAD] = { .type = NLA_U32 }, 2569 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) }, 2570 [XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 }, 2571 [XFRMA_PROTO] = { .type = NLA_U8 }, 2572 [XFRMA_ADDRESS_FILTER] = { .len = sizeof(struct xfrm_address_filter) }, 2573 [XFRMA_OFFLOAD_DEV] = { .len = sizeof(struct xfrm_user_offload) }, 2574 [XFRMA_SET_MARK] = { .type = NLA_U32 }, 2575 [XFRMA_SET_MARK_MASK] = { .type = NLA_U32 }, 2576 [XFRMA_IF_ID] = { .type = NLA_U32 }, 2577 }; 2578 2579 static const struct nla_policy xfrma_spd_policy[XFRMA_SPD_MAX+1] = { 2580 [XFRMA_SPD_IPV4_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) }, 2581 [XFRMA_SPD_IPV6_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) }, 2582 }; 2583 2584 static const struct xfrm_link { 2585 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **); 2586 int (*start)(struct netlink_callback *); 2587 int (*dump)(struct sk_buff *, struct netlink_callback *); 2588 int (*done)(struct netlink_callback *); 2589 const struct nla_policy *nla_pol; 2590 int nla_max; 2591 } xfrm_dispatch[XFRM_NR_MSGTYPES] = { 2592 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, 2593 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa }, 2594 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa, 2595 .dump = xfrm_dump_sa, 2596 .done = xfrm_dump_sa_done }, 2597 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, 2598 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy }, 2599 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy, 2600 .start = xfrm_dump_policy_start, 2601 .dump = xfrm_dump_policy, 2602 .done = xfrm_dump_policy_done }, 2603 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi }, 2604 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire }, 2605 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire }, 2606 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, 2607 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, 2608 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire}, 2609 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa }, 2610 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy }, 2611 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae }, 2612 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae }, 2613 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate }, 2614 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo }, 2615 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_set_spdinfo, 2616 .nla_pol = xfrma_spd_policy, 2617 .nla_max = XFRMA_SPD_MAX }, 2618 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo }, 2619 }; 2620 2621 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, 2622 struct netlink_ext_ack *extack) 2623 { 2624 struct net *net = sock_net(skb->sk); 2625 struct nlattr *attrs[XFRMA_MAX+1]; 2626 const struct xfrm_link *link; 2627 int type, err; 2628 2629 if (in_compat_syscall()) 2630 return -EOPNOTSUPP; 2631 2632 type = nlh->nlmsg_type; 2633 if (type > XFRM_MSG_MAX) 2634 return -EINVAL; 2635 2636 type -= XFRM_MSG_BASE; 2637 link = &xfrm_dispatch[type]; 2638 2639 /* All operations require privileges, even GET */ 2640 if (!netlink_net_capable(skb, CAP_NET_ADMIN)) 2641 return -EPERM; 2642 2643 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) || 2644 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) && 2645 (nlh->nlmsg_flags & NLM_F_DUMP)) { 2646 if (link->dump == NULL) 2647 return -EINVAL; 2648 2649 { 2650 struct netlink_dump_control c = { 2651 .start = link->start, 2652 .dump = link->dump, 2653 .done = link->done, 2654 }; 2655 return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c); 2656 } 2657 } 2658 2659 err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs, 2660 link->nla_max ? : XFRMA_MAX, 2661 link->nla_pol ? : xfrma_policy, extack); 2662 if (err < 0) 2663 return err; 2664 2665 if (link->doit == NULL) 2666 return -EINVAL; 2667 2668 return link->doit(skb, nlh, attrs); 2669 } 2670 2671 static void xfrm_netlink_rcv(struct sk_buff *skb) 2672 { 2673 struct net *net = sock_net(skb->sk); 2674 2675 mutex_lock(&net->xfrm.xfrm_cfg_mutex); 2676 netlink_rcv_skb(skb, &xfrm_user_rcv_msg); 2677 mutex_unlock(&net->xfrm.xfrm_cfg_mutex); 2678 } 2679 2680 static inline unsigned int xfrm_expire_msgsize(void) 2681 { 2682 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire)) 2683 + nla_total_size(sizeof(struct xfrm_mark)); 2684 } 2685 2686 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c) 2687 { 2688 struct xfrm_user_expire *ue; 2689 struct nlmsghdr *nlh; 2690 int err; 2691 2692 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0); 2693 if (nlh == NULL) 2694 return -EMSGSIZE; 2695 2696 ue = nlmsg_data(nlh); 2697 copy_to_user_state(x, &ue->state); 2698 ue->hard = (c->data.hard != 0) ? 1 : 0; 2699 /* clear the padding bytes */ 2700 memset(&ue->hard + 1, 0, sizeof(*ue) - offsetofend(typeof(*ue), hard)); 2701 2702 err = xfrm_mark_put(skb, &x->mark); 2703 if (err) 2704 return err; 2705 2706 err = xfrm_if_id_put(skb, x->if_id); 2707 if (err) 2708 return err; 2709 2710 nlmsg_end(skb, nlh); 2711 return 0; 2712 } 2713 2714 static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c) 2715 { 2716 struct net *net = xs_net(x); 2717 struct sk_buff *skb; 2718 2719 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC); 2720 if (skb == NULL) 2721 return -ENOMEM; 2722 2723 if (build_expire(skb, x, c) < 0) { 2724 kfree_skb(skb); 2725 return -EMSGSIZE; 2726 } 2727 2728 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE); 2729 } 2730 2731 static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c) 2732 { 2733 struct net *net = xs_net(x); 2734 struct sk_buff *skb; 2735 int err; 2736 2737 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC); 2738 if (skb == NULL) 2739 return -ENOMEM; 2740 2741 err = build_aevent(skb, x, c); 2742 BUG_ON(err < 0); 2743 2744 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS); 2745 } 2746 2747 static int xfrm_notify_sa_flush(const struct km_event *c) 2748 { 2749 struct net *net = c->net; 2750 struct xfrm_usersa_flush *p; 2751 struct nlmsghdr *nlh; 2752 struct sk_buff *skb; 2753 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush)); 2754 2755 skb = nlmsg_new(len, GFP_ATOMIC); 2756 if (skb == NULL) 2757 return -ENOMEM; 2758 2759 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0); 2760 if (nlh == NULL) { 2761 kfree_skb(skb); 2762 return -EMSGSIZE; 2763 } 2764 2765 p = nlmsg_data(nlh); 2766 p->proto = c->data.proto; 2767 2768 nlmsg_end(skb, nlh); 2769 2770 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA); 2771 } 2772 2773 static inline unsigned int xfrm_sa_len(struct xfrm_state *x) 2774 { 2775 unsigned int l = 0; 2776 if (x->aead) 2777 l += nla_total_size(aead_len(x->aead)); 2778 if (x->aalg) { 2779 l += nla_total_size(sizeof(struct xfrm_algo) + 2780 (x->aalg->alg_key_len + 7) / 8); 2781 l += nla_total_size(xfrm_alg_auth_len(x->aalg)); 2782 } 2783 if (x->ealg) 2784 l += nla_total_size(xfrm_alg_len(x->ealg)); 2785 if (x->calg) 2786 l += nla_total_size(sizeof(*x->calg)); 2787 if (x->encap) 2788 l += nla_total_size(sizeof(*x->encap)); 2789 if (x->tfcpad) 2790 l += nla_total_size(sizeof(x->tfcpad)); 2791 if (x->replay_esn) 2792 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn)); 2793 else 2794 l += nla_total_size(sizeof(struct xfrm_replay_state)); 2795 if (x->security) 2796 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) + 2797 x->security->ctx_len); 2798 if (x->coaddr) 2799 l += nla_total_size(sizeof(*x->coaddr)); 2800 if (x->props.extra_flags) 2801 l += nla_total_size(sizeof(x->props.extra_flags)); 2802 if (x->xso.dev) 2803 l += nla_total_size(sizeof(x->xso)); 2804 if (x->props.smark.v | x->props.smark.m) { 2805 l += nla_total_size(sizeof(x->props.smark.v)); 2806 l += nla_total_size(sizeof(x->props.smark.m)); 2807 } 2808 if (x->if_id) 2809 l += nla_total_size(sizeof(x->if_id)); 2810 2811 /* Must count x->lastused as it may become non-zero behind our back. */ 2812 l += nla_total_size_64bit(sizeof(u64)); 2813 2814 return l; 2815 } 2816 2817 static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c) 2818 { 2819 struct net *net = xs_net(x); 2820 struct xfrm_usersa_info *p; 2821 struct xfrm_usersa_id *id; 2822 struct nlmsghdr *nlh; 2823 struct sk_buff *skb; 2824 unsigned int len = xfrm_sa_len(x); 2825 unsigned int headlen; 2826 int err; 2827 2828 headlen = sizeof(*p); 2829 if (c->event == XFRM_MSG_DELSA) { 2830 len += nla_total_size(headlen); 2831 headlen = sizeof(*id); 2832 len += nla_total_size(sizeof(struct xfrm_mark)); 2833 } 2834 len += NLMSG_ALIGN(headlen); 2835 2836 skb = nlmsg_new(len, GFP_ATOMIC); 2837 if (skb == NULL) 2838 return -ENOMEM; 2839 2840 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0); 2841 err = -EMSGSIZE; 2842 if (nlh == NULL) 2843 goto out_free_skb; 2844 2845 p = nlmsg_data(nlh); 2846 if (c->event == XFRM_MSG_DELSA) { 2847 struct nlattr *attr; 2848 2849 id = nlmsg_data(nlh); 2850 memset(id, 0, sizeof(*id)); 2851 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr)); 2852 id->spi = x->id.spi; 2853 id->family = x->props.family; 2854 id->proto = x->id.proto; 2855 2856 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p)); 2857 err = -EMSGSIZE; 2858 if (attr == NULL) 2859 goto out_free_skb; 2860 2861 p = nla_data(attr); 2862 } 2863 err = copy_to_user_state_extra(x, p, skb); 2864 if (err) 2865 goto out_free_skb; 2866 2867 nlmsg_end(skb, nlh); 2868 2869 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA); 2870 2871 out_free_skb: 2872 kfree_skb(skb); 2873 return err; 2874 } 2875 2876 static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c) 2877 { 2878 2879 switch (c->event) { 2880 case XFRM_MSG_EXPIRE: 2881 return xfrm_exp_state_notify(x, c); 2882 case XFRM_MSG_NEWAE: 2883 return xfrm_aevent_state_notify(x, c); 2884 case XFRM_MSG_DELSA: 2885 case XFRM_MSG_UPDSA: 2886 case XFRM_MSG_NEWSA: 2887 return xfrm_notify_sa(x, c); 2888 case XFRM_MSG_FLUSHSA: 2889 return xfrm_notify_sa_flush(c); 2890 default: 2891 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n", 2892 c->event); 2893 break; 2894 } 2895 2896 return 0; 2897 2898 } 2899 2900 static inline unsigned int xfrm_acquire_msgsize(struct xfrm_state *x, 2901 struct xfrm_policy *xp) 2902 { 2903 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire)) 2904 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr) 2905 + nla_total_size(sizeof(struct xfrm_mark)) 2906 + nla_total_size(xfrm_user_sec_ctx_size(x->security)) 2907 + userpolicy_type_attrsize(); 2908 } 2909 2910 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x, 2911 struct xfrm_tmpl *xt, struct xfrm_policy *xp) 2912 { 2913 __u32 seq = xfrm_get_acqseq(); 2914 struct xfrm_user_acquire *ua; 2915 struct nlmsghdr *nlh; 2916 int err; 2917 2918 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0); 2919 if (nlh == NULL) 2920 return -EMSGSIZE; 2921 2922 ua = nlmsg_data(nlh); 2923 memcpy(&ua->id, &x->id, sizeof(ua->id)); 2924 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr)); 2925 memcpy(&ua->sel, &x->sel, sizeof(ua->sel)); 2926 copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT); 2927 ua->aalgos = xt->aalgos; 2928 ua->ealgos = xt->ealgos; 2929 ua->calgos = xt->calgos; 2930 ua->seq = x->km.seq = seq; 2931 2932 err = copy_to_user_tmpl(xp, skb); 2933 if (!err) 2934 err = copy_to_user_state_sec_ctx(x, skb); 2935 if (!err) 2936 err = copy_to_user_policy_type(xp->type, skb); 2937 if (!err) 2938 err = xfrm_mark_put(skb, &xp->mark); 2939 if (!err) 2940 err = xfrm_if_id_put(skb, xp->if_id); 2941 if (err) { 2942 nlmsg_cancel(skb, nlh); 2943 return err; 2944 } 2945 2946 nlmsg_end(skb, nlh); 2947 return 0; 2948 } 2949 2950 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt, 2951 struct xfrm_policy *xp) 2952 { 2953 struct net *net = xs_net(x); 2954 struct sk_buff *skb; 2955 int err; 2956 2957 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC); 2958 if (skb == NULL) 2959 return -ENOMEM; 2960 2961 err = build_acquire(skb, x, xt, xp); 2962 BUG_ON(err < 0); 2963 2964 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE); 2965 } 2966 2967 /* User gives us xfrm_user_policy_info followed by an array of 0 2968 * or more templates. 2969 */ 2970 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt, 2971 u8 *data, int len, int *dir) 2972 { 2973 struct net *net = sock_net(sk); 2974 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data; 2975 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1); 2976 struct xfrm_policy *xp; 2977 int nr; 2978 2979 switch (sk->sk_family) { 2980 case AF_INET: 2981 if (opt != IP_XFRM_POLICY) { 2982 *dir = -EOPNOTSUPP; 2983 return NULL; 2984 } 2985 break; 2986 #if IS_ENABLED(CONFIG_IPV6) 2987 case AF_INET6: 2988 if (opt != IPV6_XFRM_POLICY) { 2989 *dir = -EOPNOTSUPP; 2990 return NULL; 2991 } 2992 break; 2993 #endif 2994 default: 2995 *dir = -EINVAL; 2996 return NULL; 2997 } 2998 2999 *dir = -EINVAL; 3000 3001 if (len < sizeof(*p) || 3002 verify_newpolicy_info(p)) 3003 return NULL; 3004 3005 nr = ((len - sizeof(*p)) / sizeof(*ut)); 3006 if (validate_tmpl(nr, ut, p->sel.family)) 3007 return NULL; 3008 3009 if (p->dir > XFRM_POLICY_OUT) 3010 return NULL; 3011 3012 xp = xfrm_policy_alloc(net, GFP_ATOMIC); 3013 if (xp == NULL) { 3014 *dir = -ENOBUFS; 3015 return NULL; 3016 } 3017 3018 copy_from_user_policy(xp, p); 3019 xp->type = XFRM_POLICY_TYPE_MAIN; 3020 copy_templates(xp, ut, nr); 3021 3022 *dir = p->dir; 3023 3024 return xp; 3025 } 3026 3027 static inline unsigned int xfrm_polexpire_msgsize(struct xfrm_policy *xp) 3028 { 3029 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire)) 3030 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr) 3031 + nla_total_size(xfrm_user_sec_ctx_size(xp->security)) 3032 + nla_total_size(sizeof(struct xfrm_mark)) 3033 + userpolicy_type_attrsize(); 3034 } 3035 3036 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp, 3037 int dir, const struct km_event *c) 3038 { 3039 struct xfrm_user_polexpire *upe; 3040 int hard = c->data.hard; 3041 struct nlmsghdr *nlh; 3042 int err; 3043 3044 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0); 3045 if (nlh == NULL) 3046 return -EMSGSIZE; 3047 3048 upe = nlmsg_data(nlh); 3049 copy_to_user_policy(xp, &upe->pol, dir); 3050 err = copy_to_user_tmpl(xp, skb); 3051 if (!err) 3052 err = copy_to_user_sec_ctx(xp, skb); 3053 if (!err) 3054 err = copy_to_user_policy_type(xp->type, skb); 3055 if (!err) 3056 err = xfrm_mark_put(skb, &xp->mark); 3057 if (!err) 3058 err = xfrm_if_id_put(skb, xp->if_id); 3059 if (err) { 3060 nlmsg_cancel(skb, nlh); 3061 return err; 3062 } 3063 upe->hard = !!hard; 3064 3065 nlmsg_end(skb, nlh); 3066 return 0; 3067 } 3068 3069 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 3070 { 3071 struct net *net = xp_net(xp); 3072 struct sk_buff *skb; 3073 int err; 3074 3075 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC); 3076 if (skb == NULL) 3077 return -ENOMEM; 3078 3079 err = build_polexpire(skb, xp, dir, c); 3080 BUG_ON(err < 0); 3081 3082 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE); 3083 } 3084 3085 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c) 3086 { 3087 unsigned int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr); 3088 struct net *net = xp_net(xp); 3089 struct xfrm_userpolicy_info *p; 3090 struct xfrm_userpolicy_id *id; 3091 struct nlmsghdr *nlh; 3092 struct sk_buff *skb; 3093 unsigned int headlen; 3094 int err; 3095 3096 headlen = sizeof(*p); 3097 if (c->event == XFRM_MSG_DELPOLICY) { 3098 len += nla_total_size(headlen); 3099 headlen = sizeof(*id); 3100 } 3101 len += userpolicy_type_attrsize(); 3102 len += nla_total_size(sizeof(struct xfrm_mark)); 3103 len += NLMSG_ALIGN(headlen); 3104 3105 skb = nlmsg_new(len, GFP_ATOMIC); 3106 if (skb == NULL) 3107 return -ENOMEM; 3108 3109 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0); 3110 err = -EMSGSIZE; 3111 if (nlh == NULL) 3112 goto out_free_skb; 3113 3114 p = nlmsg_data(nlh); 3115 if (c->event == XFRM_MSG_DELPOLICY) { 3116 struct nlattr *attr; 3117 3118 id = nlmsg_data(nlh); 3119 memset(id, 0, sizeof(*id)); 3120 id->dir = dir; 3121 if (c->data.byid) 3122 id->index = xp->index; 3123 else 3124 memcpy(&id->sel, &xp->selector, sizeof(id->sel)); 3125 3126 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p)); 3127 err = -EMSGSIZE; 3128 if (attr == NULL) 3129 goto out_free_skb; 3130 3131 p = nla_data(attr); 3132 } 3133 3134 copy_to_user_policy(xp, p, dir); 3135 err = copy_to_user_tmpl(xp, skb); 3136 if (!err) 3137 err = copy_to_user_policy_type(xp->type, skb); 3138 if (!err) 3139 err = xfrm_mark_put(skb, &xp->mark); 3140 if (!err) 3141 err = xfrm_if_id_put(skb, xp->if_id); 3142 if (err) 3143 goto out_free_skb; 3144 3145 nlmsg_end(skb, nlh); 3146 3147 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY); 3148 3149 out_free_skb: 3150 kfree_skb(skb); 3151 return err; 3152 } 3153 3154 static int xfrm_notify_policy_flush(const struct km_event *c) 3155 { 3156 struct net *net = c->net; 3157 struct nlmsghdr *nlh; 3158 struct sk_buff *skb; 3159 int err; 3160 3161 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC); 3162 if (skb == NULL) 3163 return -ENOMEM; 3164 3165 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0); 3166 err = -EMSGSIZE; 3167 if (nlh == NULL) 3168 goto out_free_skb; 3169 err = copy_to_user_policy_type(c->data.type, skb); 3170 if (err) 3171 goto out_free_skb; 3172 3173 nlmsg_end(skb, nlh); 3174 3175 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY); 3176 3177 out_free_skb: 3178 kfree_skb(skb); 3179 return err; 3180 } 3181 3182 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 3183 { 3184 3185 switch (c->event) { 3186 case XFRM_MSG_NEWPOLICY: 3187 case XFRM_MSG_UPDPOLICY: 3188 case XFRM_MSG_DELPOLICY: 3189 return xfrm_notify_policy(xp, dir, c); 3190 case XFRM_MSG_FLUSHPOLICY: 3191 return xfrm_notify_policy_flush(c); 3192 case XFRM_MSG_POLEXPIRE: 3193 return xfrm_exp_policy_notify(xp, dir, c); 3194 default: 3195 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n", 3196 c->event); 3197 } 3198 3199 return 0; 3200 3201 } 3202 3203 static inline unsigned int xfrm_report_msgsize(void) 3204 { 3205 return NLMSG_ALIGN(sizeof(struct xfrm_user_report)); 3206 } 3207 3208 static int build_report(struct sk_buff *skb, u8 proto, 3209 struct xfrm_selector *sel, xfrm_address_t *addr) 3210 { 3211 struct xfrm_user_report *ur; 3212 struct nlmsghdr *nlh; 3213 3214 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0); 3215 if (nlh == NULL) 3216 return -EMSGSIZE; 3217 3218 ur = nlmsg_data(nlh); 3219 ur->proto = proto; 3220 memcpy(&ur->sel, sel, sizeof(ur->sel)); 3221 3222 if (addr) { 3223 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr); 3224 if (err) { 3225 nlmsg_cancel(skb, nlh); 3226 return err; 3227 } 3228 } 3229 nlmsg_end(skb, nlh); 3230 return 0; 3231 } 3232 3233 static int xfrm_send_report(struct net *net, u8 proto, 3234 struct xfrm_selector *sel, xfrm_address_t *addr) 3235 { 3236 struct sk_buff *skb; 3237 int err; 3238 3239 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC); 3240 if (skb == NULL) 3241 return -ENOMEM; 3242 3243 err = build_report(skb, proto, sel, addr); 3244 BUG_ON(err < 0); 3245 3246 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT); 3247 } 3248 3249 static inline unsigned int xfrm_mapping_msgsize(void) 3250 { 3251 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping)); 3252 } 3253 3254 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x, 3255 xfrm_address_t *new_saddr, __be16 new_sport) 3256 { 3257 struct xfrm_user_mapping *um; 3258 struct nlmsghdr *nlh; 3259 3260 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0); 3261 if (nlh == NULL) 3262 return -EMSGSIZE; 3263 3264 um = nlmsg_data(nlh); 3265 3266 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr)); 3267 um->id.spi = x->id.spi; 3268 um->id.family = x->props.family; 3269 um->id.proto = x->id.proto; 3270 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr)); 3271 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr)); 3272 um->new_sport = new_sport; 3273 um->old_sport = x->encap->encap_sport; 3274 um->reqid = x->props.reqid; 3275 3276 nlmsg_end(skb, nlh); 3277 return 0; 3278 } 3279 3280 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, 3281 __be16 sport) 3282 { 3283 struct net *net = xs_net(x); 3284 struct sk_buff *skb; 3285 int err; 3286 3287 if (x->id.proto != IPPROTO_ESP) 3288 return -EINVAL; 3289 3290 if (!x->encap) 3291 return -EINVAL; 3292 3293 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC); 3294 if (skb == NULL) 3295 return -ENOMEM; 3296 3297 err = build_mapping(skb, x, ipaddr, sport); 3298 BUG_ON(err < 0); 3299 3300 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING); 3301 } 3302 3303 static bool xfrm_is_alive(const struct km_event *c) 3304 { 3305 return (bool)xfrm_acquire_is_on(c->net); 3306 } 3307 3308 static struct xfrm_mgr netlink_mgr = { 3309 .notify = xfrm_send_state_notify, 3310 .acquire = xfrm_send_acquire, 3311 .compile_policy = xfrm_compile_policy, 3312 .notify_policy = xfrm_send_policy_notify, 3313 .report = xfrm_send_report, 3314 .migrate = xfrm_send_migrate, 3315 .new_mapping = xfrm_send_mapping, 3316 .is_alive = xfrm_is_alive, 3317 }; 3318 3319 static int __net_init xfrm_user_net_init(struct net *net) 3320 { 3321 struct sock *nlsk; 3322 struct netlink_kernel_cfg cfg = { 3323 .groups = XFRMNLGRP_MAX, 3324 .input = xfrm_netlink_rcv, 3325 }; 3326 3327 nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg); 3328 if (nlsk == NULL) 3329 return -ENOMEM; 3330 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */ 3331 rcu_assign_pointer(net->xfrm.nlsk, nlsk); 3332 return 0; 3333 } 3334 3335 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list) 3336 { 3337 struct net *net; 3338 list_for_each_entry(net, net_exit_list, exit_list) 3339 RCU_INIT_POINTER(net->xfrm.nlsk, NULL); 3340 synchronize_net(); 3341 list_for_each_entry(net, net_exit_list, exit_list) 3342 netlink_kernel_release(net->xfrm.nlsk_stash); 3343 } 3344 3345 static struct pernet_operations xfrm_user_net_ops = { 3346 .init = xfrm_user_net_init, 3347 .exit_batch = xfrm_user_net_exit, 3348 }; 3349 3350 static int __init xfrm_user_init(void) 3351 { 3352 int rv; 3353 3354 printk(KERN_INFO "Initializing XFRM netlink socket\n"); 3355 3356 rv = register_pernet_subsys(&xfrm_user_net_ops); 3357 if (rv < 0) 3358 return rv; 3359 rv = xfrm_register_km(&netlink_mgr); 3360 if (rv < 0) 3361 unregister_pernet_subsys(&xfrm_user_net_ops); 3362 return rv; 3363 } 3364 3365 static void __exit xfrm_user_exit(void) 3366 { 3367 xfrm_unregister_km(&netlink_mgr); 3368 unregister_pernet_subsys(&xfrm_user_net_ops); 3369 } 3370 3371 module_init(xfrm_user_init); 3372 module_exit(xfrm_user_exit); 3373 MODULE_LICENSE("GPL"); 3374 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM); 3375