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 <asm/uaccess.h> 31 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 32 #include <linux/in6.h> 33 #endif 34 35 static inline int aead_len(struct xfrm_algo_aead *alg) 36 { 37 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 38 } 39 40 static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type) 41 { 42 struct nlattr *rt = attrs[type]; 43 struct xfrm_algo *algp; 44 45 if (!rt) 46 return 0; 47 48 algp = nla_data(rt); 49 if (nla_len(rt) < xfrm_alg_len(algp)) 50 return -EINVAL; 51 52 switch (type) { 53 case XFRMA_ALG_AUTH: 54 case XFRMA_ALG_CRYPT: 55 case XFRMA_ALG_COMP: 56 break; 57 58 default: 59 return -EINVAL; 60 } 61 62 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0'; 63 return 0; 64 } 65 66 static int verify_auth_trunc(struct nlattr **attrs) 67 { 68 struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC]; 69 struct xfrm_algo_auth *algp; 70 71 if (!rt) 72 return 0; 73 74 algp = nla_data(rt); 75 if (nla_len(rt) < xfrm_alg_auth_len(algp)) 76 return -EINVAL; 77 78 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0'; 79 return 0; 80 } 81 82 static int verify_aead(struct nlattr **attrs) 83 { 84 struct nlattr *rt = attrs[XFRMA_ALG_AEAD]; 85 struct xfrm_algo_aead *algp; 86 87 if (!rt) 88 return 0; 89 90 algp = nla_data(rt); 91 if (nla_len(rt) < aead_len(algp)) 92 return -EINVAL; 93 94 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0'; 95 return 0; 96 } 97 98 static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type, 99 xfrm_address_t **addrp) 100 { 101 struct nlattr *rt = attrs[type]; 102 103 if (rt && addrp) 104 *addrp = nla_data(rt); 105 } 106 107 static inline int verify_sec_ctx_len(struct nlattr **attrs) 108 { 109 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 110 struct xfrm_user_sec_ctx *uctx; 111 112 if (!rt) 113 return 0; 114 115 uctx = nla_data(rt); 116 if (uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len)) 117 return -EINVAL; 118 119 return 0; 120 } 121 122 123 static int verify_newsa_info(struct xfrm_usersa_info *p, 124 struct nlattr **attrs) 125 { 126 int err; 127 128 err = -EINVAL; 129 switch (p->family) { 130 case AF_INET: 131 break; 132 133 case AF_INET6: 134 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 135 break; 136 #else 137 err = -EAFNOSUPPORT; 138 goto out; 139 #endif 140 141 default: 142 goto out; 143 } 144 145 err = -EINVAL; 146 switch (p->id.proto) { 147 case IPPROTO_AH: 148 if ((!attrs[XFRMA_ALG_AUTH] && 149 !attrs[XFRMA_ALG_AUTH_TRUNC]) || 150 attrs[XFRMA_ALG_AEAD] || 151 attrs[XFRMA_ALG_CRYPT] || 152 attrs[XFRMA_ALG_COMP] || 153 attrs[XFRMA_TFCPAD]) 154 goto out; 155 break; 156 157 case IPPROTO_ESP: 158 if (attrs[XFRMA_ALG_COMP]) 159 goto out; 160 if (!attrs[XFRMA_ALG_AUTH] && 161 !attrs[XFRMA_ALG_AUTH_TRUNC] && 162 !attrs[XFRMA_ALG_CRYPT] && 163 !attrs[XFRMA_ALG_AEAD]) 164 goto out; 165 if ((attrs[XFRMA_ALG_AUTH] || 166 attrs[XFRMA_ALG_AUTH_TRUNC] || 167 attrs[XFRMA_ALG_CRYPT]) && 168 attrs[XFRMA_ALG_AEAD]) 169 goto out; 170 if (attrs[XFRMA_TFCPAD] && 171 p->mode != XFRM_MODE_TUNNEL) 172 goto out; 173 break; 174 175 case IPPROTO_COMP: 176 if (!attrs[XFRMA_ALG_COMP] || 177 attrs[XFRMA_ALG_AEAD] || 178 attrs[XFRMA_ALG_AUTH] || 179 attrs[XFRMA_ALG_AUTH_TRUNC] || 180 attrs[XFRMA_ALG_CRYPT] || 181 attrs[XFRMA_TFCPAD]) 182 goto out; 183 break; 184 185 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 186 case IPPROTO_DSTOPTS: 187 case IPPROTO_ROUTING: 188 if (attrs[XFRMA_ALG_COMP] || 189 attrs[XFRMA_ALG_AUTH] || 190 attrs[XFRMA_ALG_AUTH_TRUNC] || 191 attrs[XFRMA_ALG_AEAD] || 192 attrs[XFRMA_ALG_CRYPT] || 193 attrs[XFRMA_ENCAP] || 194 attrs[XFRMA_SEC_CTX] || 195 attrs[XFRMA_TFCPAD] || 196 !attrs[XFRMA_COADDR]) 197 goto out; 198 break; 199 #endif 200 201 default: 202 goto out; 203 } 204 205 if ((err = verify_aead(attrs))) 206 goto out; 207 if ((err = verify_auth_trunc(attrs))) 208 goto out; 209 if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH))) 210 goto out; 211 if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT))) 212 goto out; 213 if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP))) 214 goto out; 215 if ((err = verify_sec_ctx_len(attrs))) 216 goto out; 217 218 err = -EINVAL; 219 switch (p->mode) { 220 case XFRM_MODE_TRANSPORT: 221 case XFRM_MODE_TUNNEL: 222 case XFRM_MODE_ROUTEOPTIMIZATION: 223 case XFRM_MODE_BEET: 224 break; 225 226 default: 227 goto out; 228 } 229 230 err = 0; 231 232 out: 233 return err; 234 } 235 236 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props, 237 struct xfrm_algo_desc *(*get_byname)(char *, int), 238 struct nlattr *rta) 239 { 240 struct xfrm_algo *p, *ualg; 241 struct xfrm_algo_desc *algo; 242 243 if (!rta) 244 return 0; 245 246 ualg = nla_data(rta); 247 248 algo = get_byname(ualg->alg_name, 1); 249 if (!algo) 250 return -ENOSYS; 251 *props = algo->desc.sadb_alg_id; 252 253 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL); 254 if (!p) 255 return -ENOMEM; 256 257 strcpy(p->alg_name, algo->name); 258 *algpp = p; 259 return 0; 260 } 261 262 static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props, 263 struct nlattr *rta) 264 { 265 struct xfrm_algo *ualg; 266 struct xfrm_algo_auth *p; 267 struct xfrm_algo_desc *algo; 268 269 if (!rta) 270 return 0; 271 272 ualg = nla_data(rta); 273 274 algo = xfrm_aalg_get_byname(ualg->alg_name, 1); 275 if (!algo) 276 return -ENOSYS; 277 *props = algo->desc.sadb_alg_id; 278 279 p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL); 280 if (!p) 281 return -ENOMEM; 282 283 strcpy(p->alg_name, algo->name); 284 p->alg_key_len = ualg->alg_key_len; 285 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits; 286 memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8); 287 288 *algpp = p; 289 return 0; 290 } 291 292 static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props, 293 struct nlattr *rta) 294 { 295 struct xfrm_algo_auth *p, *ualg; 296 struct xfrm_algo_desc *algo; 297 298 if (!rta) 299 return 0; 300 301 ualg = nla_data(rta); 302 303 algo = xfrm_aalg_get_byname(ualg->alg_name, 1); 304 if (!algo) 305 return -ENOSYS; 306 if ((ualg->alg_trunc_len / 8) > MAX_AH_AUTH_LEN || 307 ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits) 308 return -EINVAL; 309 *props = algo->desc.sadb_alg_id; 310 311 p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL); 312 if (!p) 313 return -ENOMEM; 314 315 strcpy(p->alg_name, algo->name); 316 if (!p->alg_trunc_len) 317 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits; 318 319 *algpp = p; 320 return 0; 321 } 322 323 static int attach_aead(struct xfrm_algo_aead **algpp, u8 *props, 324 struct nlattr *rta) 325 { 326 struct xfrm_algo_aead *p, *ualg; 327 struct xfrm_algo_desc *algo; 328 329 if (!rta) 330 return 0; 331 332 ualg = nla_data(rta); 333 334 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1); 335 if (!algo) 336 return -ENOSYS; 337 *props = algo->desc.sadb_alg_id; 338 339 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL); 340 if (!p) 341 return -ENOMEM; 342 343 strcpy(p->alg_name, algo->name); 344 *algpp = p; 345 return 0; 346 } 347 348 static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx) 349 { 350 int len = 0; 351 352 if (xfrm_ctx) { 353 len += sizeof(struct xfrm_user_sec_ctx); 354 len += xfrm_ctx->ctx_len; 355 } 356 return len; 357 } 358 359 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p) 360 { 361 memcpy(&x->id, &p->id, sizeof(x->id)); 362 memcpy(&x->sel, &p->sel, sizeof(x->sel)); 363 memcpy(&x->lft, &p->lft, sizeof(x->lft)); 364 x->props.mode = p->mode; 365 x->props.replay_window = p->replay_window; 366 x->props.reqid = p->reqid; 367 x->props.family = p->family; 368 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr)); 369 x->props.flags = p->flags; 370 371 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC)) 372 x->sel.family = p->family; 373 } 374 375 /* 376 * someday when pfkey also has support, we could have the code 377 * somehow made shareable and move it to xfrm_state.c - JHS 378 * 379 */ 380 static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs) 381 { 382 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL]; 383 struct nlattr *lt = attrs[XFRMA_LTIME_VAL]; 384 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH]; 385 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH]; 386 387 if (rp) { 388 struct xfrm_replay_state *replay; 389 replay = nla_data(rp); 390 memcpy(&x->replay, replay, sizeof(*replay)); 391 memcpy(&x->preplay, replay, sizeof(*replay)); 392 } 393 394 if (lt) { 395 struct xfrm_lifetime_cur *ltime; 396 ltime = nla_data(lt); 397 x->curlft.bytes = ltime->bytes; 398 x->curlft.packets = ltime->packets; 399 x->curlft.add_time = ltime->add_time; 400 x->curlft.use_time = ltime->use_time; 401 } 402 403 if (et) 404 x->replay_maxage = nla_get_u32(et); 405 406 if (rt) 407 x->replay_maxdiff = nla_get_u32(rt); 408 } 409 410 static struct xfrm_state *xfrm_state_construct(struct net *net, 411 struct xfrm_usersa_info *p, 412 struct nlattr **attrs, 413 int *errp) 414 { 415 struct xfrm_state *x = xfrm_state_alloc(net); 416 int err = -ENOMEM; 417 418 if (!x) 419 goto error_no_put; 420 421 copy_from_user_state(x, p); 422 423 if ((err = attach_aead(&x->aead, &x->props.ealgo, 424 attrs[XFRMA_ALG_AEAD]))) 425 goto error; 426 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo, 427 attrs[XFRMA_ALG_AUTH_TRUNC]))) 428 goto error; 429 if (!x->props.aalgo) { 430 if ((err = attach_auth(&x->aalg, &x->props.aalgo, 431 attrs[XFRMA_ALG_AUTH]))) 432 goto error; 433 } 434 if ((err = attach_one_algo(&x->ealg, &x->props.ealgo, 435 xfrm_ealg_get_byname, 436 attrs[XFRMA_ALG_CRYPT]))) 437 goto error; 438 if ((err = attach_one_algo(&x->calg, &x->props.calgo, 439 xfrm_calg_get_byname, 440 attrs[XFRMA_ALG_COMP]))) 441 goto error; 442 443 if (attrs[XFRMA_ENCAP]) { 444 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]), 445 sizeof(*x->encap), GFP_KERNEL); 446 if (x->encap == NULL) 447 goto error; 448 } 449 450 if (attrs[XFRMA_TFCPAD]) 451 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]); 452 453 if (attrs[XFRMA_COADDR]) { 454 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]), 455 sizeof(*x->coaddr), GFP_KERNEL); 456 if (x->coaddr == NULL) 457 goto error; 458 } 459 460 xfrm_mark_get(attrs, &x->mark); 461 462 err = xfrm_init_state(x); 463 if (err) 464 goto error; 465 466 if (attrs[XFRMA_SEC_CTX] && 467 security_xfrm_state_alloc(x, nla_data(attrs[XFRMA_SEC_CTX]))) 468 goto error; 469 470 x->km.seq = p->seq; 471 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth; 472 /* sysctl_xfrm_aevent_etime is in 100ms units */ 473 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M; 474 x->preplay.bitmap = 0; 475 x->preplay.seq = x->replay.seq+x->replay_maxdiff; 476 x->preplay.oseq = x->replay.oseq +x->replay_maxdiff; 477 478 /* override default values from above */ 479 480 xfrm_update_ae_params(x, attrs); 481 482 return x; 483 484 error: 485 x->km.state = XFRM_STATE_DEAD; 486 xfrm_state_put(x); 487 error_no_put: 488 *errp = err; 489 return NULL; 490 } 491 492 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 493 struct nlattr **attrs) 494 { 495 struct net *net = sock_net(skb->sk); 496 struct xfrm_usersa_info *p = nlmsg_data(nlh); 497 struct xfrm_state *x; 498 int err; 499 struct km_event c; 500 uid_t loginuid = NETLINK_CB(skb).loginuid; 501 u32 sessionid = NETLINK_CB(skb).sessionid; 502 u32 sid = NETLINK_CB(skb).sid; 503 504 err = verify_newsa_info(p, attrs); 505 if (err) 506 return err; 507 508 x = xfrm_state_construct(net, p, attrs, &err); 509 if (!x) 510 return err; 511 512 xfrm_state_hold(x); 513 if (nlh->nlmsg_type == XFRM_MSG_NEWSA) 514 err = xfrm_state_add(x); 515 else 516 err = xfrm_state_update(x); 517 518 xfrm_audit_state_add(x, err ? 0 : 1, loginuid, sessionid, sid); 519 520 if (err < 0) { 521 x->km.state = XFRM_STATE_DEAD; 522 __xfrm_state_put(x); 523 goto out; 524 } 525 526 c.seq = nlh->nlmsg_seq; 527 c.pid = nlh->nlmsg_pid; 528 c.event = nlh->nlmsg_type; 529 530 km_state_notify(x, &c); 531 out: 532 xfrm_state_put(x); 533 return err; 534 } 535 536 static struct xfrm_state *xfrm_user_state_lookup(struct net *net, 537 struct xfrm_usersa_id *p, 538 struct nlattr **attrs, 539 int *errp) 540 { 541 struct xfrm_state *x = NULL; 542 struct xfrm_mark m; 543 int err; 544 u32 mark = xfrm_mark_get(attrs, &m); 545 546 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) { 547 err = -ESRCH; 548 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family); 549 } else { 550 xfrm_address_t *saddr = NULL; 551 552 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr); 553 if (!saddr) { 554 err = -EINVAL; 555 goto out; 556 } 557 558 err = -ESRCH; 559 x = xfrm_state_lookup_byaddr(net, mark, 560 &p->daddr, saddr, 561 p->proto, p->family); 562 } 563 564 out: 565 if (!x && errp) 566 *errp = err; 567 return x; 568 } 569 570 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 571 struct nlattr **attrs) 572 { 573 struct net *net = sock_net(skb->sk); 574 struct xfrm_state *x; 575 int err = -ESRCH; 576 struct km_event c; 577 struct xfrm_usersa_id *p = nlmsg_data(nlh); 578 uid_t loginuid = NETLINK_CB(skb).loginuid; 579 u32 sessionid = NETLINK_CB(skb).sessionid; 580 u32 sid = NETLINK_CB(skb).sid; 581 582 x = xfrm_user_state_lookup(net, p, attrs, &err); 583 if (x == NULL) 584 return err; 585 586 if ((err = security_xfrm_state_delete(x)) != 0) 587 goto out; 588 589 if (xfrm_state_kern(x)) { 590 err = -EPERM; 591 goto out; 592 } 593 594 err = xfrm_state_delete(x); 595 596 if (err < 0) 597 goto out; 598 599 c.seq = nlh->nlmsg_seq; 600 c.pid = nlh->nlmsg_pid; 601 c.event = nlh->nlmsg_type; 602 km_state_notify(x, &c); 603 604 out: 605 xfrm_audit_state_delete(x, err ? 0 : 1, loginuid, sessionid, sid); 606 xfrm_state_put(x); 607 return err; 608 } 609 610 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p) 611 { 612 memcpy(&p->id, &x->id, sizeof(p->id)); 613 memcpy(&p->sel, &x->sel, sizeof(p->sel)); 614 memcpy(&p->lft, &x->lft, sizeof(p->lft)); 615 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft)); 616 memcpy(&p->stats, &x->stats, sizeof(p->stats)); 617 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr)); 618 p->mode = x->props.mode; 619 p->replay_window = x->props.replay_window; 620 p->reqid = x->props.reqid; 621 p->family = x->props.family; 622 p->flags = x->props.flags; 623 p->seq = x->km.seq; 624 } 625 626 struct xfrm_dump_info { 627 struct sk_buff *in_skb; 628 struct sk_buff *out_skb; 629 u32 nlmsg_seq; 630 u16 nlmsg_flags; 631 }; 632 633 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb) 634 { 635 struct xfrm_user_sec_ctx *uctx; 636 struct nlattr *attr; 637 int ctx_size = sizeof(*uctx) + s->ctx_len; 638 639 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size); 640 if (attr == NULL) 641 return -EMSGSIZE; 642 643 uctx = nla_data(attr); 644 uctx->exttype = XFRMA_SEC_CTX; 645 uctx->len = ctx_size; 646 uctx->ctx_doi = s->ctx_doi; 647 uctx->ctx_alg = s->ctx_alg; 648 uctx->ctx_len = s->ctx_len; 649 memcpy(uctx + 1, s->ctx_str, s->ctx_len); 650 651 return 0; 652 } 653 654 static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb) 655 { 656 struct xfrm_algo *algo; 657 struct nlattr *nla; 658 659 nla = nla_reserve(skb, XFRMA_ALG_AUTH, 660 sizeof(*algo) + (auth->alg_key_len + 7) / 8); 661 if (!nla) 662 return -EMSGSIZE; 663 664 algo = nla_data(nla); 665 strcpy(algo->alg_name, auth->alg_name); 666 memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8); 667 algo->alg_key_len = auth->alg_key_len; 668 669 return 0; 670 } 671 672 /* Don't change this without updating xfrm_sa_len! */ 673 static int copy_to_user_state_extra(struct xfrm_state *x, 674 struct xfrm_usersa_info *p, 675 struct sk_buff *skb) 676 { 677 copy_to_user_state(x, p); 678 679 if (x->coaddr) 680 NLA_PUT(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr); 681 682 if (x->lastused) 683 NLA_PUT_U64(skb, XFRMA_LASTUSED, x->lastused); 684 685 if (x->aead) 686 NLA_PUT(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead); 687 if (x->aalg) { 688 if (copy_to_user_auth(x->aalg, skb)) 689 goto nla_put_failure; 690 691 NLA_PUT(skb, XFRMA_ALG_AUTH_TRUNC, 692 xfrm_alg_auth_len(x->aalg), x->aalg); 693 } 694 if (x->ealg) 695 NLA_PUT(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg); 696 if (x->calg) 697 NLA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg); 698 699 if (x->encap) 700 NLA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap); 701 702 if (x->tfcpad) 703 NLA_PUT_U32(skb, XFRMA_TFCPAD, x->tfcpad); 704 705 if (xfrm_mark_put(skb, &x->mark)) 706 goto nla_put_failure; 707 708 if (x->security && copy_sec_ctx(x->security, skb) < 0) 709 goto nla_put_failure; 710 711 return 0; 712 713 nla_put_failure: 714 return -EMSGSIZE; 715 } 716 717 static int dump_one_state(struct xfrm_state *x, int count, void *ptr) 718 { 719 struct xfrm_dump_info *sp = ptr; 720 struct sk_buff *in_skb = sp->in_skb; 721 struct sk_buff *skb = sp->out_skb; 722 struct xfrm_usersa_info *p; 723 struct nlmsghdr *nlh; 724 int err; 725 726 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq, 727 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags); 728 if (nlh == NULL) 729 return -EMSGSIZE; 730 731 p = nlmsg_data(nlh); 732 733 err = copy_to_user_state_extra(x, p, skb); 734 if (err) 735 goto nla_put_failure; 736 737 nlmsg_end(skb, nlh); 738 return 0; 739 740 nla_put_failure: 741 nlmsg_cancel(skb, nlh); 742 return err; 743 } 744 745 static int xfrm_dump_sa_done(struct netlink_callback *cb) 746 { 747 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1]; 748 xfrm_state_walk_done(walk); 749 return 0; 750 } 751 752 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb) 753 { 754 struct net *net = sock_net(skb->sk); 755 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1]; 756 struct xfrm_dump_info info; 757 758 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) > 759 sizeof(cb->args) - sizeof(cb->args[0])); 760 761 info.in_skb = cb->skb; 762 info.out_skb = skb; 763 info.nlmsg_seq = cb->nlh->nlmsg_seq; 764 info.nlmsg_flags = NLM_F_MULTI; 765 766 if (!cb->args[0]) { 767 cb->args[0] = 1; 768 xfrm_state_walk_init(walk, 0); 769 } 770 771 (void) xfrm_state_walk(net, walk, dump_one_state, &info); 772 773 return skb->len; 774 } 775 776 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb, 777 struct xfrm_state *x, u32 seq) 778 { 779 struct xfrm_dump_info info; 780 struct sk_buff *skb; 781 782 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 783 if (!skb) 784 return ERR_PTR(-ENOMEM); 785 786 info.in_skb = in_skb; 787 info.out_skb = skb; 788 info.nlmsg_seq = seq; 789 info.nlmsg_flags = 0; 790 791 if (dump_one_state(x, 0, &info)) { 792 kfree_skb(skb); 793 return NULL; 794 } 795 796 return skb; 797 } 798 799 static inline size_t xfrm_spdinfo_msgsize(void) 800 { 801 return NLMSG_ALIGN(4) 802 + nla_total_size(sizeof(struct xfrmu_spdinfo)) 803 + nla_total_size(sizeof(struct xfrmu_spdhinfo)); 804 } 805 806 static int build_spdinfo(struct sk_buff *skb, struct net *net, 807 u32 pid, u32 seq, u32 flags) 808 { 809 struct xfrmk_spdinfo si; 810 struct xfrmu_spdinfo spc; 811 struct xfrmu_spdhinfo sph; 812 struct nlmsghdr *nlh; 813 u32 *f; 814 815 nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0); 816 if (nlh == NULL) /* shouldnt really happen ... */ 817 return -EMSGSIZE; 818 819 f = nlmsg_data(nlh); 820 *f = flags; 821 xfrm_spd_getinfo(net, &si); 822 spc.incnt = si.incnt; 823 spc.outcnt = si.outcnt; 824 spc.fwdcnt = si.fwdcnt; 825 spc.inscnt = si.inscnt; 826 spc.outscnt = si.outscnt; 827 spc.fwdscnt = si.fwdscnt; 828 sph.spdhcnt = si.spdhcnt; 829 sph.spdhmcnt = si.spdhmcnt; 830 831 NLA_PUT(skb, XFRMA_SPD_INFO, sizeof(spc), &spc); 832 NLA_PUT(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph); 833 834 return nlmsg_end(skb, nlh); 835 836 nla_put_failure: 837 nlmsg_cancel(skb, nlh); 838 return -EMSGSIZE; 839 } 840 841 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh, 842 struct nlattr **attrs) 843 { 844 struct net *net = sock_net(skb->sk); 845 struct sk_buff *r_skb; 846 u32 *flags = nlmsg_data(nlh); 847 u32 spid = NETLINK_CB(skb).pid; 848 u32 seq = nlh->nlmsg_seq; 849 850 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC); 851 if (r_skb == NULL) 852 return -ENOMEM; 853 854 if (build_spdinfo(r_skb, net, spid, seq, *flags) < 0) 855 BUG(); 856 857 return nlmsg_unicast(net->xfrm.nlsk, r_skb, spid); 858 } 859 860 static inline size_t xfrm_sadinfo_msgsize(void) 861 { 862 return NLMSG_ALIGN(4) 863 + nla_total_size(sizeof(struct xfrmu_sadhinfo)) 864 + nla_total_size(4); /* XFRMA_SAD_CNT */ 865 } 866 867 static int build_sadinfo(struct sk_buff *skb, struct net *net, 868 u32 pid, u32 seq, u32 flags) 869 { 870 struct xfrmk_sadinfo si; 871 struct xfrmu_sadhinfo sh; 872 struct nlmsghdr *nlh; 873 u32 *f; 874 875 nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0); 876 if (nlh == NULL) /* shouldnt really happen ... */ 877 return -EMSGSIZE; 878 879 f = nlmsg_data(nlh); 880 *f = flags; 881 xfrm_sad_getinfo(net, &si); 882 883 sh.sadhmcnt = si.sadhmcnt; 884 sh.sadhcnt = si.sadhcnt; 885 886 NLA_PUT_U32(skb, XFRMA_SAD_CNT, si.sadcnt); 887 NLA_PUT(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh); 888 889 return nlmsg_end(skb, nlh); 890 891 nla_put_failure: 892 nlmsg_cancel(skb, nlh); 893 return -EMSGSIZE; 894 } 895 896 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh, 897 struct nlattr **attrs) 898 { 899 struct net *net = sock_net(skb->sk); 900 struct sk_buff *r_skb; 901 u32 *flags = nlmsg_data(nlh); 902 u32 spid = NETLINK_CB(skb).pid; 903 u32 seq = nlh->nlmsg_seq; 904 905 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC); 906 if (r_skb == NULL) 907 return -ENOMEM; 908 909 if (build_sadinfo(r_skb, net, spid, seq, *flags) < 0) 910 BUG(); 911 912 return nlmsg_unicast(net->xfrm.nlsk, r_skb, spid); 913 } 914 915 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 916 struct nlattr **attrs) 917 { 918 struct net *net = sock_net(skb->sk); 919 struct xfrm_usersa_id *p = nlmsg_data(nlh); 920 struct xfrm_state *x; 921 struct sk_buff *resp_skb; 922 int err = -ESRCH; 923 924 x = xfrm_user_state_lookup(net, p, attrs, &err); 925 if (x == NULL) 926 goto out_noput; 927 928 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); 929 if (IS_ERR(resp_skb)) { 930 err = PTR_ERR(resp_skb); 931 } else { 932 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).pid); 933 } 934 xfrm_state_put(x); 935 out_noput: 936 return err; 937 } 938 939 static int verify_userspi_info(struct xfrm_userspi_info *p) 940 { 941 switch (p->info.id.proto) { 942 case IPPROTO_AH: 943 case IPPROTO_ESP: 944 break; 945 946 case IPPROTO_COMP: 947 /* IPCOMP spi is 16-bits. */ 948 if (p->max >= 0x10000) 949 return -EINVAL; 950 break; 951 952 default: 953 return -EINVAL; 954 } 955 956 if (p->min > p->max) 957 return -EINVAL; 958 959 return 0; 960 } 961 962 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh, 963 struct nlattr **attrs) 964 { 965 struct net *net = sock_net(skb->sk); 966 struct xfrm_state *x; 967 struct xfrm_userspi_info *p; 968 struct sk_buff *resp_skb; 969 xfrm_address_t *daddr; 970 int family; 971 int err; 972 u32 mark; 973 struct xfrm_mark m; 974 975 p = nlmsg_data(nlh); 976 err = verify_userspi_info(p); 977 if (err) 978 goto out_noput; 979 980 family = p->info.family; 981 daddr = &p->info.id.daddr; 982 983 x = NULL; 984 985 mark = xfrm_mark_get(attrs, &m); 986 if (p->info.seq) { 987 x = xfrm_find_acq_byseq(net, mark, p->info.seq); 988 if (x && xfrm_addr_cmp(&x->id.daddr, daddr, family)) { 989 xfrm_state_put(x); 990 x = NULL; 991 } 992 } 993 994 if (!x) 995 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid, 996 p->info.id.proto, daddr, 997 &p->info.saddr, 1, 998 family); 999 err = -ENOENT; 1000 if (x == NULL) 1001 goto out_noput; 1002 1003 err = xfrm_alloc_spi(x, p->min, p->max); 1004 if (err) 1005 goto out; 1006 1007 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); 1008 if (IS_ERR(resp_skb)) { 1009 err = PTR_ERR(resp_skb); 1010 goto out; 1011 } 1012 1013 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).pid); 1014 1015 out: 1016 xfrm_state_put(x); 1017 out_noput: 1018 return err; 1019 } 1020 1021 static int verify_policy_dir(u8 dir) 1022 { 1023 switch (dir) { 1024 case XFRM_POLICY_IN: 1025 case XFRM_POLICY_OUT: 1026 case XFRM_POLICY_FWD: 1027 break; 1028 1029 default: 1030 return -EINVAL; 1031 } 1032 1033 return 0; 1034 } 1035 1036 static int verify_policy_type(u8 type) 1037 { 1038 switch (type) { 1039 case XFRM_POLICY_TYPE_MAIN: 1040 #ifdef CONFIG_XFRM_SUB_POLICY 1041 case XFRM_POLICY_TYPE_SUB: 1042 #endif 1043 break; 1044 1045 default: 1046 return -EINVAL; 1047 } 1048 1049 return 0; 1050 } 1051 1052 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p) 1053 { 1054 switch (p->share) { 1055 case XFRM_SHARE_ANY: 1056 case XFRM_SHARE_SESSION: 1057 case XFRM_SHARE_USER: 1058 case XFRM_SHARE_UNIQUE: 1059 break; 1060 1061 default: 1062 return -EINVAL; 1063 } 1064 1065 switch (p->action) { 1066 case XFRM_POLICY_ALLOW: 1067 case XFRM_POLICY_BLOCK: 1068 break; 1069 1070 default: 1071 return -EINVAL; 1072 } 1073 1074 switch (p->sel.family) { 1075 case AF_INET: 1076 break; 1077 1078 case AF_INET6: 1079 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 1080 break; 1081 #else 1082 return -EAFNOSUPPORT; 1083 #endif 1084 1085 default: 1086 return -EINVAL; 1087 } 1088 1089 return verify_policy_dir(p->dir); 1090 } 1091 1092 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs) 1093 { 1094 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 1095 struct xfrm_user_sec_ctx *uctx; 1096 1097 if (!rt) 1098 return 0; 1099 1100 uctx = nla_data(rt); 1101 return security_xfrm_policy_alloc(&pol->security, uctx); 1102 } 1103 1104 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut, 1105 int nr) 1106 { 1107 int i; 1108 1109 xp->xfrm_nr = nr; 1110 for (i = 0; i < nr; i++, ut++) { 1111 struct xfrm_tmpl *t = &xp->xfrm_vec[i]; 1112 1113 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id)); 1114 memcpy(&t->saddr, &ut->saddr, 1115 sizeof(xfrm_address_t)); 1116 t->reqid = ut->reqid; 1117 t->mode = ut->mode; 1118 t->share = ut->share; 1119 t->optional = ut->optional; 1120 t->aalgos = ut->aalgos; 1121 t->ealgos = ut->ealgos; 1122 t->calgos = ut->calgos; 1123 /* If all masks are ~0, then we allow all algorithms. */ 1124 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos); 1125 t->encap_family = ut->family; 1126 } 1127 } 1128 1129 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family) 1130 { 1131 int i; 1132 1133 if (nr > XFRM_MAX_DEPTH) 1134 return -EINVAL; 1135 1136 for (i = 0; i < nr; i++) { 1137 /* We never validated the ut->family value, so many 1138 * applications simply leave it at zero. The check was 1139 * never made and ut->family was ignored because all 1140 * templates could be assumed to have the same family as 1141 * the policy itself. Now that we will have ipv4-in-ipv6 1142 * and ipv6-in-ipv4 tunnels, this is no longer true. 1143 */ 1144 if (!ut[i].family) 1145 ut[i].family = family; 1146 1147 switch (ut[i].family) { 1148 case AF_INET: 1149 break; 1150 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 1151 case AF_INET6: 1152 break; 1153 #endif 1154 default: 1155 return -EINVAL; 1156 } 1157 } 1158 1159 return 0; 1160 } 1161 1162 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs) 1163 { 1164 struct nlattr *rt = attrs[XFRMA_TMPL]; 1165 1166 if (!rt) { 1167 pol->xfrm_nr = 0; 1168 } else { 1169 struct xfrm_user_tmpl *utmpl = nla_data(rt); 1170 int nr = nla_len(rt) / sizeof(*utmpl); 1171 int err; 1172 1173 err = validate_tmpl(nr, utmpl, pol->family); 1174 if (err) 1175 return err; 1176 1177 copy_templates(pol, utmpl, nr); 1178 } 1179 return 0; 1180 } 1181 1182 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs) 1183 { 1184 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE]; 1185 struct xfrm_userpolicy_type *upt; 1186 u8 type = XFRM_POLICY_TYPE_MAIN; 1187 int err; 1188 1189 if (rt) { 1190 upt = nla_data(rt); 1191 type = upt->type; 1192 } 1193 1194 err = verify_policy_type(type); 1195 if (err) 1196 return err; 1197 1198 *tp = type; 1199 return 0; 1200 } 1201 1202 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p) 1203 { 1204 xp->priority = p->priority; 1205 xp->index = p->index; 1206 memcpy(&xp->selector, &p->sel, sizeof(xp->selector)); 1207 memcpy(&xp->lft, &p->lft, sizeof(xp->lft)); 1208 xp->action = p->action; 1209 xp->flags = p->flags; 1210 xp->family = p->sel.family; 1211 /* XXX xp->share = p->share; */ 1212 } 1213 1214 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir) 1215 { 1216 memcpy(&p->sel, &xp->selector, sizeof(p->sel)); 1217 memcpy(&p->lft, &xp->lft, sizeof(p->lft)); 1218 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft)); 1219 p->priority = xp->priority; 1220 p->index = xp->index; 1221 p->sel.family = xp->family; 1222 p->dir = dir; 1223 p->action = xp->action; 1224 p->flags = xp->flags; 1225 p->share = XFRM_SHARE_ANY; /* XXX xp->share */ 1226 } 1227 1228 static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp) 1229 { 1230 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL); 1231 int err; 1232 1233 if (!xp) { 1234 *errp = -ENOMEM; 1235 return NULL; 1236 } 1237 1238 copy_from_user_policy(xp, p); 1239 1240 err = copy_from_user_policy_type(&xp->type, attrs); 1241 if (err) 1242 goto error; 1243 1244 if (!(err = copy_from_user_tmpl(xp, attrs))) 1245 err = copy_from_user_sec_ctx(xp, attrs); 1246 if (err) 1247 goto error; 1248 1249 xfrm_mark_get(attrs, &xp->mark); 1250 1251 return xp; 1252 error: 1253 *errp = err; 1254 xp->walk.dead = 1; 1255 xfrm_policy_destroy(xp); 1256 return NULL; 1257 } 1258 1259 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 1260 struct nlattr **attrs) 1261 { 1262 struct net *net = sock_net(skb->sk); 1263 struct xfrm_userpolicy_info *p = nlmsg_data(nlh); 1264 struct xfrm_policy *xp; 1265 struct km_event c; 1266 int err; 1267 int excl; 1268 uid_t loginuid = NETLINK_CB(skb).loginuid; 1269 u32 sessionid = NETLINK_CB(skb).sessionid; 1270 u32 sid = NETLINK_CB(skb).sid; 1271 1272 err = verify_newpolicy_info(p); 1273 if (err) 1274 return err; 1275 err = verify_sec_ctx_len(attrs); 1276 if (err) 1277 return err; 1278 1279 xp = xfrm_policy_construct(net, p, attrs, &err); 1280 if (!xp) 1281 return err; 1282 1283 /* shouldnt excl be based on nlh flags?? 1284 * Aha! this is anti-netlink really i.e more pfkey derived 1285 * in netlink excl is a flag and you wouldnt need 1286 * a type XFRM_MSG_UPDPOLICY - JHS */ 1287 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY; 1288 err = xfrm_policy_insert(p->dir, xp, excl); 1289 xfrm_audit_policy_add(xp, err ? 0 : 1, loginuid, sessionid, sid); 1290 1291 if (err) { 1292 security_xfrm_policy_free(xp->security); 1293 kfree(xp); 1294 return err; 1295 } 1296 1297 c.event = nlh->nlmsg_type; 1298 c.seq = nlh->nlmsg_seq; 1299 c.pid = nlh->nlmsg_pid; 1300 km_policy_notify(xp, p->dir, &c); 1301 1302 xfrm_pol_put(xp); 1303 1304 return 0; 1305 } 1306 1307 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb) 1308 { 1309 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH]; 1310 int i; 1311 1312 if (xp->xfrm_nr == 0) 1313 return 0; 1314 1315 for (i = 0; i < xp->xfrm_nr; i++) { 1316 struct xfrm_user_tmpl *up = &vec[i]; 1317 struct xfrm_tmpl *kp = &xp->xfrm_vec[i]; 1318 1319 memcpy(&up->id, &kp->id, sizeof(up->id)); 1320 up->family = kp->encap_family; 1321 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr)); 1322 up->reqid = kp->reqid; 1323 up->mode = kp->mode; 1324 up->share = kp->share; 1325 up->optional = kp->optional; 1326 up->aalgos = kp->aalgos; 1327 up->ealgos = kp->ealgos; 1328 up->calgos = kp->calgos; 1329 } 1330 1331 return nla_put(skb, XFRMA_TMPL, 1332 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec); 1333 } 1334 1335 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb) 1336 { 1337 if (x->security) { 1338 return copy_sec_ctx(x->security, skb); 1339 } 1340 return 0; 1341 } 1342 1343 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb) 1344 { 1345 if (xp->security) { 1346 return copy_sec_ctx(xp->security, skb); 1347 } 1348 return 0; 1349 } 1350 static inline size_t userpolicy_type_attrsize(void) 1351 { 1352 #ifdef CONFIG_XFRM_SUB_POLICY 1353 return nla_total_size(sizeof(struct xfrm_userpolicy_type)); 1354 #else 1355 return 0; 1356 #endif 1357 } 1358 1359 #ifdef CONFIG_XFRM_SUB_POLICY 1360 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb) 1361 { 1362 struct xfrm_userpolicy_type upt = { 1363 .type = type, 1364 }; 1365 1366 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt); 1367 } 1368 1369 #else 1370 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb) 1371 { 1372 return 0; 1373 } 1374 #endif 1375 1376 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr) 1377 { 1378 struct xfrm_dump_info *sp = ptr; 1379 struct xfrm_userpolicy_info *p; 1380 struct sk_buff *in_skb = sp->in_skb; 1381 struct sk_buff *skb = sp->out_skb; 1382 struct nlmsghdr *nlh; 1383 1384 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq, 1385 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags); 1386 if (nlh == NULL) 1387 return -EMSGSIZE; 1388 1389 p = nlmsg_data(nlh); 1390 copy_to_user_policy(xp, p, dir); 1391 if (copy_to_user_tmpl(xp, skb) < 0) 1392 goto nlmsg_failure; 1393 if (copy_to_user_sec_ctx(xp, skb)) 1394 goto nlmsg_failure; 1395 if (copy_to_user_policy_type(xp->type, skb) < 0) 1396 goto nlmsg_failure; 1397 if (xfrm_mark_put(skb, &xp->mark)) 1398 goto nla_put_failure; 1399 1400 nlmsg_end(skb, nlh); 1401 return 0; 1402 1403 nla_put_failure: 1404 nlmsg_failure: 1405 nlmsg_cancel(skb, nlh); 1406 return -EMSGSIZE; 1407 } 1408 1409 static int xfrm_dump_policy_done(struct netlink_callback *cb) 1410 { 1411 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1]; 1412 1413 xfrm_policy_walk_done(walk); 1414 return 0; 1415 } 1416 1417 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb) 1418 { 1419 struct net *net = sock_net(skb->sk); 1420 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1]; 1421 struct xfrm_dump_info info; 1422 1423 BUILD_BUG_ON(sizeof(struct xfrm_policy_walk) > 1424 sizeof(cb->args) - sizeof(cb->args[0])); 1425 1426 info.in_skb = cb->skb; 1427 info.out_skb = skb; 1428 info.nlmsg_seq = cb->nlh->nlmsg_seq; 1429 info.nlmsg_flags = NLM_F_MULTI; 1430 1431 if (!cb->args[0]) { 1432 cb->args[0] = 1; 1433 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY); 1434 } 1435 1436 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info); 1437 1438 return skb->len; 1439 } 1440 1441 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb, 1442 struct xfrm_policy *xp, 1443 int dir, u32 seq) 1444 { 1445 struct xfrm_dump_info info; 1446 struct sk_buff *skb; 1447 1448 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1449 if (!skb) 1450 return ERR_PTR(-ENOMEM); 1451 1452 info.in_skb = in_skb; 1453 info.out_skb = skb; 1454 info.nlmsg_seq = seq; 1455 info.nlmsg_flags = 0; 1456 1457 if (dump_one_policy(xp, dir, 0, &info) < 0) { 1458 kfree_skb(skb); 1459 return NULL; 1460 } 1461 1462 return skb; 1463 } 1464 1465 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 1466 struct nlattr **attrs) 1467 { 1468 struct net *net = sock_net(skb->sk); 1469 struct xfrm_policy *xp; 1470 struct xfrm_userpolicy_id *p; 1471 u8 type = XFRM_POLICY_TYPE_MAIN; 1472 int err; 1473 struct km_event c; 1474 int delete; 1475 struct xfrm_mark m; 1476 u32 mark = xfrm_mark_get(attrs, &m); 1477 1478 p = nlmsg_data(nlh); 1479 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY; 1480 1481 err = copy_from_user_policy_type(&type, attrs); 1482 if (err) 1483 return err; 1484 1485 err = verify_policy_dir(p->dir); 1486 if (err) 1487 return err; 1488 1489 if (p->index) 1490 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err); 1491 else { 1492 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 1493 struct xfrm_sec_ctx *ctx; 1494 1495 err = verify_sec_ctx_len(attrs); 1496 if (err) 1497 return err; 1498 1499 ctx = NULL; 1500 if (rt) { 1501 struct xfrm_user_sec_ctx *uctx = nla_data(rt); 1502 1503 err = security_xfrm_policy_alloc(&ctx, uctx); 1504 if (err) 1505 return err; 1506 } 1507 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel, 1508 ctx, delete, &err); 1509 security_xfrm_policy_free(ctx); 1510 } 1511 if (xp == NULL) 1512 return -ENOENT; 1513 1514 if (!delete) { 1515 struct sk_buff *resp_skb; 1516 1517 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq); 1518 if (IS_ERR(resp_skb)) { 1519 err = PTR_ERR(resp_skb); 1520 } else { 1521 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, 1522 NETLINK_CB(skb).pid); 1523 } 1524 } else { 1525 uid_t loginuid = NETLINK_CB(skb).loginuid; 1526 u32 sessionid = NETLINK_CB(skb).sessionid; 1527 u32 sid = NETLINK_CB(skb).sid; 1528 1529 xfrm_audit_policy_delete(xp, err ? 0 : 1, loginuid, sessionid, 1530 sid); 1531 1532 if (err != 0) 1533 goto out; 1534 1535 c.data.byid = p->index; 1536 c.event = nlh->nlmsg_type; 1537 c.seq = nlh->nlmsg_seq; 1538 c.pid = nlh->nlmsg_pid; 1539 km_policy_notify(xp, p->dir, &c); 1540 } 1541 1542 out: 1543 xfrm_pol_put(xp); 1544 return err; 1545 } 1546 1547 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 1548 struct nlattr **attrs) 1549 { 1550 struct net *net = sock_net(skb->sk); 1551 struct km_event c; 1552 struct xfrm_usersa_flush *p = nlmsg_data(nlh); 1553 struct xfrm_audit audit_info; 1554 int err; 1555 1556 audit_info.loginuid = NETLINK_CB(skb).loginuid; 1557 audit_info.sessionid = NETLINK_CB(skb).sessionid; 1558 audit_info.secid = NETLINK_CB(skb).sid; 1559 err = xfrm_state_flush(net, p->proto, &audit_info); 1560 if (err) { 1561 if (err == -ESRCH) /* empty table */ 1562 return 0; 1563 return err; 1564 } 1565 c.data.proto = p->proto; 1566 c.event = nlh->nlmsg_type; 1567 c.seq = nlh->nlmsg_seq; 1568 c.pid = nlh->nlmsg_pid; 1569 c.net = net; 1570 km_state_notify(NULL, &c); 1571 1572 return 0; 1573 } 1574 1575 static inline size_t xfrm_aevent_msgsize(void) 1576 { 1577 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id)) 1578 + nla_total_size(sizeof(struct xfrm_replay_state)) 1579 + nla_total_size(sizeof(struct xfrm_lifetime_cur)) 1580 + nla_total_size(sizeof(struct xfrm_mark)) 1581 + nla_total_size(4) /* XFRM_AE_RTHR */ 1582 + nla_total_size(4); /* XFRM_AE_ETHR */ 1583 } 1584 1585 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c) 1586 { 1587 struct xfrm_aevent_id *id; 1588 struct nlmsghdr *nlh; 1589 1590 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0); 1591 if (nlh == NULL) 1592 return -EMSGSIZE; 1593 1594 id = nlmsg_data(nlh); 1595 memcpy(&id->sa_id.daddr, &x->id.daddr,sizeof(x->id.daddr)); 1596 id->sa_id.spi = x->id.spi; 1597 id->sa_id.family = x->props.family; 1598 id->sa_id.proto = x->id.proto; 1599 memcpy(&id->saddr, &x->props.saddr,sizeof(x->props.saddr)); 1600 id->reqid = x->props.reqid; 1601 id->flags = c->data.aevent; 1602 1603 NLA_PUT(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), &x->replay); 1604 NLA_PUT(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft); 1605 1606 if (id->flags & XFRM_AE_RTHR) 1607 NLA_PUT_U32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff); 1608 1609 if (id->flags & XFRM_AE_ETHR) 1610 NLA_PUT_U32(skb, XFRMA_ETIMER_THRESH, 1611 x->replay_maxage * 10 / HZ); 1612 1613 if (xfrm_mark_put(skb, &x->mark)) 1614 goto nla_put_failure; 1615 1616 return nlmsg_end(skb, nlh); 1617 1618 nla_put_failure: 1619 nlmsg_cancel(skb, nlh); 1620 return -EMSGSIZE; 1621 } 1622 1623 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh, 1624 struct nlattr **attrs) 1625 { 1626 struct net *net = sock_net(skb->sk); 1627 struct xfrm_state *x; 1628 struct sk_buff *r_skb; 1629 int err; 1630 struct km_event c; 1631 u32 mark; 1632 struct xfrm_mark m; 1633 struct xfrm_aevent_id *p = nlmsg_data(nlh); 1634 struct xfrm_usersa_id *id = &p->sa_id; 1635 1636 r_skb = nlmsg_new(xfrm_aevent_msgsize(), GFP_ATOMIC); 1637 if (r_skb == NULL) 1638 return -ENOMEM; 1639 1640 mark = xfrm_mark_get(attrs, &m); 1641 1642 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family); 1643 if (x == NULL) { 1644 kfree_skb(r_skb); 1645 return -ESRCH; 1646 } 1647 1648 /* 1649 * XXX: is this lock really needed - none of the other 1650 * gets lock (the concern is things getting updated 1651 * while we are still reading) - jhs 1652 */ 1653 spin_lock_bh(&x->lock); 1654 c.data.aevent = p->flags; 1655 c.seq = nlh->nlmsg_seq; 1656 c.pid = nlh->nlmsg_pid; 1657 1658 if (build_aevent(r_skb, x, &c) < 0) 1659 BUG(); 1660 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).pid); 1661 spin_unlock_bh(&x->lock); 1662 xfrm_state_put(x); 1663 return err; 1664 } 1665 1666 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh, 1667 struct nlattr **attrs) 1668 { 1669 struct net *net = sock_net(skb->sk); 1670 struct xfrm_state *x; 1671 struct km_event c; 1672 int err = - EINVAL; 1673 u32 mark = 0; 1674 struct xfrm_mark m; 1675 struct xfrm_aevent_id *p = nlmsg_data(nlh); 1676 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL]; 1677 struct nlattr *lt = attrs[XFRMA_LTIME_VAL]; 1678 1679 if (!lt && !rp) 1680 return err; 1681 1682 /* pedantic mode - thou shalt sayeth replaceth */ 1683 if (!(nlh->nlmsg_flags&NLM_F_REPLACE)) 1684 return err; 1685 1686 mark = xfrm_mark_get(attrs, &m); 1687 1688 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family); 1689 if (x == NULL) 1690 return -ESRCH; 1691 1692 if (x->km.state != XFRM_STATE_VALID) 1693 goto out; 1694 1695 spin_lock_bh(&x->lock); 1696 xfrm_update_ae_params(x, attrs); 1697 spin_unlock_bh(&x->lock); 1698 1699 c.event = nlh->nlmsg_type; 1700 c.seq = nlh->nlmsg_seq; 1701 c.pid = nlh->nlmsg_pid; 1702 c.data.aevent = XFRM_AE_CU; 1703 km_state_notify(x, &c); 1704 err = 0; 1705 out: 1706 xfrm_state_put(x); 1707 return err; 1708 } 1709 1710 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 1711 struct nlattr **attrs) 1712 { 1713 struct net *net = sock_net(skb->sk); 1714 struct km_event c; 1715 u8 type = XFRM_POLICY_TYPE_MAIN; 1716 int err; 1717 struct xfrm_audit audit_info; 1718 1719 err = copy_from_user_policy_type(&type, attrs); 1720 if (err) 1721 return err; 1722 1723 audit_info.loginuid = NETLINK_CB(skb).loginuid; 1724 audit_info.sessionid = NETLINK_CB(skb).sessionid; 1725 audit_info.secid = NETLINK_CB(skb).sid; 1726 err = xfrm_policy_flush(net, type, &audit_info); 1727 if (err) { 1728 if (err == -ESRCH) /* empty table */ 1729 return 0; 1730 return err; 1731 } 1732 1733 c.data.type = type; 1734 c.event = nlh->nlmsg_type; 1735 c.seq = nlh->nlmsg_seq; 1736 c.pid = nlh->nlmsg_pid; 1737 c.net = net; 1738 km_policy_notify(NULL, 0, &c); 1739 return 0; 1740 } 1741 1742 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh, 1743 struct nlattr **attrs) 1744 { 1745 struct net *net = sock_net(skb->sk); 1746 struct xfrm_policy *xp; 1747 struct xfrm_user_polexpire *up = nlmsg_data(nlh); 1748 struct xfrm_userpolicy_info *p = &up->pol; 1749 u8 type = XFRM_POLICY_TYPE_MAIN; 1750 int err = -ENOENT; 1751 struct xfrm_mark m; 1752 u32 mark = xfrm_mark_get(attrs, &m); 1753 1754 err = copy_from_user_policy_type(&type, attrs); 1755 if (err) 1756 return err; 1757 1758 err = verify_policy_dir(p->dir); 1759 if (err) 1760 return err; 1761 1762 if (p->index) 1763 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err); 1764 else { 1765 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 1766 struct xfrm_sec_ctx *ctx; 1767 1768 err = verify_sec_ctx_len(attrs); 1769 if (err) 1770 return err; 1771 1772 ctx = NULL; 1773 if (rt) { 1774 struct xfrm_user_sec_ctx *uctx = nla_data(rt); 1775 1776 err = security_xfrm_policy_alloc(&ctx, uctx); 1777 if (err) 1778 return err; 1779 } 1780 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, 1781 &p->sel, ctx, 0, &err); 1782 security_xfrm_policy_free(ctx); 1783 } 1784 if (xp == NULL) 1785 return -ENOENT; 1786 1787 if (unlikely(xp->walk.dead)) 1788 goto out; 1789 1790 err = 0; 1791 if (up->hard) { 1792 uid_t loginuid = NETLINK_CB(skb).loginuid; 1793 uid_t sessionid = NETLINK_CB(skb).sessionid; 1794 u32 sid = NETLINK_CB(skb).sid; 1795 xfrm_policy_delete(xp, p->dir); 1796 xfrm_audit_policy_delete(xp, 1, loginuid, sessionid, sid); 1797 1798 } else { 1799 // reset the timers here? 1800 WARN(1, "Dont know what to do with soft policy expire\n"); 1801 } 1802 km_policy_expired(xp, p->dir, up->hard, current->pid); 1803 1804 out: 1805 xfrm_pol_put(xp); 1806 return err; 1807 } 1808 1809 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh, 1810 struct nlattr **attrs) 1811 { 1812 struct net *net = sock_net(skb->sk); 1813 struct xfrm_state *x; 1814 int err; 1815 struct xfrm_user_expire *ue = nlmsg_data(nlh); 1816 struct xfrm_usersa_info *p = &ue->state; 1817 struct xfrm_mark m; 1818 u32 mark = xfrm_mark_get(attrs, &m); 1819 1820 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family); 1821 1822 err = -ENOENT; 1823 if (x == NULL) 1824 return err; 1825 1826 spin_lock_bh(&x->lock); 1827 err = -EINVAL; 1828 if (x->km.state != XFRM_STATE_VALID) 1829 goto out; 1830 km_state_expired(x, ue->hard, current->pid); 1831 1832 if (ue->hard) { 1833 uid_t loginuid = NETLINK_CB(skb).loginuid; 1834 uid_t sessionid = NETLINK_CB(skb).sessionid; 1835 u32 sid = NETLINK_CB(skb).sid; 1836 __xfrm_state_delete(x); 1837 xfrm_audit_state_delete(x, 1, loginuid, sessionid, sid); 1838 } 1839 err = 0; 1840 out: 1841 spin_unlock_bh(&x->lock); 1842 xfrm_state_put(x); 1843 return err; 1844 } 1845 1846 static int xfrm_add_acquire(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_user_tmpl *ut; 1852 int i; 1853 struct nlattr *rt = attrs[XFRMA_TMPL]; 1854 struct xfrm_mark mark; 1855 1856 struct xfrm_user_acquire *ua = nlmsg_data(nlh); 1857 struct xfrm_state *x = xfrm_state_alloc(net); 1858 int err = -ENOMEM; 1859 1860 if (!x) 1861 goto nomem; 1862 1863 xfrm_mark_get(attrs, &mark); 1864 1865 err = verify_newpolicy_info(&ua->policy); 1866 if (err) 1867 goto bad_policy; 1868 1869 /* build an XP */ 1870 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err); 1871 if (!xp) 1872 goto free_state; 1873 1874 memcpy(&x->id, &ua->id, sizeof(ua->id)); 1875 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr)); 1876 memcpy(&x->sel, &ua->sel, sizeof(ua->sel)); 1877 xp->mark.m = x->mark.m = mark.m; 1878 xp->mark.v = x->mark.v = mark.v; 1879 ut = nla_data(rt); 1880 /* extract the templates and for each call km_key */ 1881 for (i = 0; i < xp->xfrm_nr; i++, ut++) { 1882 struct xfrm_tmpl *t = &xp->xfrm_vec[i]; 1883 memcpy(&x->id, &t->id, sizeof(x->id)); 1884 x->props.mode = t->mode; 1885 x->props.reqid = t->reqid; 1886 x->props.family = ut->family; 1887 t->aalgos = ua->aalgos; 1888 t->ealgos = ua->ealgos; 1889 t->calgos = ua->calgos; 1890 err = km_query(x, t, xp); 1891 1892 } 1893 1894 kfree(x); 1895 kfree(xp); 1896 1897 return 0; 1898 1899 bad_policy: 1900 WARN(1, "BAD policy passed\n"); 1901 free_state: 1902 kfree(x); 1903 nomem: 1904 return err; 1905 } 1906 1907 #ifdef CONFIG_XFRM_MIGRATE 1908 static int copy_from_user_migrate(struct xfrm_migrate *ma, 1909 struct xfrm_kmaddress *k, 1910 struct nlattr **attrs, int *num) 1911 { 1912 struct nlattr *rt = attrs[XFRMA_MIGRATE]; 1913 struct xfrm_user_migrate *um; 1914 int i, num_migrate; 1915 1916 if (k != NULL) { 1917 struct xfrm_user_kmaddress *uk; 1918 1919 uk = nla_data(attrs[XFRMA_KMADDRESS]); 1920 memcpy(&k->local, &uk->local, sizeof(k->local)); 1921 memcpy(&k->remote, &uk->remote, sizeof(k->remote)); 1922 k->family = uk->family; 1923 k->reserved = uk->reserved; 1924 } 1925 1926 um = nla_data(rt); 1927 num_migrate = nla_len(rt) / sizeof(*um); 1928 1929 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH) 1930 return -EINVAL; 1931 1932 for (i = 0; i < num_migrate; i++, um++, ma++) { 1933 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr)); 1934 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr)); 1935 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr)); 1936 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr)); 1937 1938 ma->proto = um->proto; 1939 ma->mode = um->mode; 1940 ma->reqid = um->reqid; 1941 1942 ma->old_family = um->old_family; 1943 ma->new_family = um->new_family; 1944 } 1945 1946 *num = i; 1947 return 0; 1948 } 1949 1950 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh, 1951 struct nlattr **attrs) 1952 { 1953 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh); 1954 struct xfrm_migrate m[XFRM_MAX_DEPTH]; 1955 struct xfrm_kmaddress km, *kmp; 1956 u8 type; 1957 int err; 1958 int n = 0; 1959 1960 if (attrs[XFRMA_MIGRATE] == NULL) 1961 return -EINVAL; 1962 1963 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL; 1964 1965 err = copy_from_user_policy_type(&type, attrs); 1966 if (err) 1967 return err; 1968 1969 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n); 1970 if (err) 1971 return err; 1972 1973 if (!n) 1974 return 0; 1975 1976 xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp); 1977 1978 return 0; 1979 } 1980 #else 1981 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh, 1982 struct nlattr **attrs) 1983 { 1984 return -ENOPROTOOPT; 1985 } 1986 #endif 1987 1988 #ifdef CONFIG_XFRM_MIGRATE 1989 static int copy_to_user_migrate(struct xfrm_migrate *m, struct sk_buff *skb) 1990 { 1991 struct xfrm_user_migrate um; 1992 1993 memset(&um, 0, sizeof(um)); 1994 um.proto = m->proto; 1995 um.mode = m->mode; 1996 um.reqid = m->reqid; 1997 um.old_family = m->old_family; 1998 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr)); 1999 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr)); 2000 um.new_family = m->new_family; 2001 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr)); 2002 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr)); 2003 2004 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um); 2005 } 2006 2007 static int copy_to_user_kmaddress(struct xfrm_kmaddress *k, struct sk_buff *skb) 2008 { 2009 struct xfrm_user_kmaddress uk; 2010 2011 memset(&uk, 0, sizeof(uk)); 2012 uk.family = k->family; 2013 uk.reserved = k->reserved; 2014 memcpy(&uk.local, &k->local, sizeof(uk.local)); 2015 memcpy(&uk.remote, &k->remote, sizeof(uk.remote)); 2016 2017 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk); 2018 } 2019 2020 static inline size_t xfrm_migrate_msgsize(int num_migrate, int with_kma) 2021 { 2022 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id)) 2023 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0) 2024 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate) 2025 + userpolicy_type_attrsize(); 2026 } 2027 2028 static int build_migrate(struct sk_buff *skb, struct xfrm_migrate *m, 2029 int num_migrate, struct xfrm_kmaddress *k, 2030 struct xfrm_selector *sel, u8 dir, u8 type) 2031 { 2032 struct xfrm_migrate *mp; 2033 struct xfrm_userpolicy_id *pol_id; 2034 struct nlmsghdr *nlh; 2035 int i; 2036 2037 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0); 2038 if (nlh == NULL) 2039 return -EMSGSIZE; 2040 2041 pol_id = nlmsg_data(nlh); 2042 /* copy data from selector, dir, and type to the pol_id */ 2043 memset(pol_id, 0, sizeof(*pol_id)); 2044 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel)); 2045 pol_id->dir = dir; 2046 2047 if (k != NULL && (copy_to_user_kmaddress(k, skb) < 0)) 2048 goto nlmsg_failure; 2049 2050 if (copy_to_user_policy_type(type, skb) < 0) 2051 goto nlmsg_failure; 2052 2053 for (i = 0, mp = m ; i < num_migrate; i++, mp++) { 2054 if (copy_to_user_migrate(mp, skb) < 0) 2055 goto nlmsg_failure; 2056 } 2057 2058 return nlmsg_end(skb, nlh); 2059 nlmsg_failure: 2060 nlmsg_cancel(skb, nlh); 2061 return -EMSGSIZE; 2062 } 2063 2064 static int xfrm_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type, 2065 struct xfrm_migrate *m, int num_migrate, 2066 struct xfrm_kmaddress *k) 2067 { 2068 struct net *net = &init_net; 2069 struct sk_buff *skb; 2070 2071 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k), GFP_ATOMIC); 2072 if (skb == NULL) 2073 return -ENOMEM; 2074 2075 /* build migrate */ 2076 if (build_migrate(skb, m, num_migrate, k, sel, dir, type) < 0) 2077 BUG(); 2078 2079 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MIGRATE, GFP_ATOMIC); 2080 } 2081 #else 2082 static int xfrm_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type, 2083 struct xfrm_migrate *m, int num_migrate, 2084 struct xfrm_kmaddress *k) 2085 { 2086 return -ENOPROTOOPT; 2087 } 2088 #endif 2089 2090 #define XMSGSIZE(type) sizeof(struct type) 2091 2092 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = { 2093 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), 2094 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), 2095 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), 2096 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), 2097 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 2098 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 2099 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info), 2100 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire), 2101 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire), 2102 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), 2103 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), 2104 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire), 2105 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush), 2106 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0, 2107 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), 2108 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), 2109 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report), 2110 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 2111 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32), 2112 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32), 2113 }; 2114 2115 #undef XMSGSIZE 2116 2117 static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = { 2118 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)}, 2119 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)}, 2120 [XFRMA_LASTUSED] = { .type = NLA_U64}, 2121 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)}, 2122 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) }, 2123 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) }, 2124 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) }, 2125 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) }, 2126 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) }, 2127 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) }, 2128 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) }, 2129 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) }, 2130 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) }, 2131 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 }, 2132 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 }, 2133 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) }, 2134 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) }, 2135 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)}, 2136 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) }, 2137 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) }, 2138 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) }, 2139 [XFRMA_TFCPAD] = { .type = NLA_U32 }, 2140 }; 2141 2142 static struct xfrm_link { 2143 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **); 2144 int (*dump)(struct sk_buff *, struct netlink_callback *); 2145 int (*done)(struct netlink_callback *); 2146 } xfrm_dispatch[XFRM_NR_MSGTYPES] = { 2147 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, 2148 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa }, 2149 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa, 2150 .dump = xfrm_dump_sa, 2151 .done = xfrm_dump_sa_done }, 2152 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, 2153 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy }, 2154 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy, 2155 .dump = xfrm_dump_policy, 2156 .done = xfrm_dump_policy_done }, 2157 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi }, 2158 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire }, 2159 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire }, 2160 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, 2161 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, 2162 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire}, 2163 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa }, 2164 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy }, 2165 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae }, 2166 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae }, 2167 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate }, 2168 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo }, 2169 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo }, 2170 }; 2171 2172 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 2173 { 2174 struct net *net = sock_net(skb->sk); 2175 struct nlattr *attrs[XFRMA_MAX+1]; 2176 struct xfrm_link *link; 2177 int type, err; 2178 2179 type = nlh->nlmsg_type; 2180 if (type > XFRM_MSG_MAX) 2181 return -EINVAL; 2182 2183 type -= XFRM_MSG_BASE; 2184 link = &xfrm_dispatch[type]; 2185 2186 /* All operations require privileges, even GET */ 2187 if (security_netlink_recv(skb, CAP_NET_ADMIN)) 2188 return -EPERM; 2189 2190 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) || 2191 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) && 2192 (nlh->nlmsg_flags & NLM_F_DUMP)) { 2193 if (link->dump == NULL) 2194 return -EINVAL; 2195 2196 return netlink_dump_start(net->xfrm.nlsk, skb, nlh, link->dump, link->done); 2197 } 2198 2199 err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs, XFRMA_MAX, 2200 xfrma_policy); 2201 if (err < 0) 2202 return err; 2203 2204 if (link->doit == NULL) 2205 return -EINVAL; 2206 2207 return link->doit(skb, nlh, attrs); 2208 } 2209 2210 static void xfrm_netlink_rcv(struct sk_buff *skb) 2211 { 2212 mutex_lock(&xfrm_cfg_mutex); 2213 netlink_rcv_skb(skb, &xfrm_user_rcv_msg); 2214 mutex_unlock(&xfrm_cfg_mutex); 2215 } 2216 2217 static inline size_t xfrm_expire_msgsize(void) 2218 { 2219 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire)) 2220 + nla_total_size(sizeof(struct xfrm_mark)); 2221 } 2222 2223 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c) 2224 { 2225 struct xfrm_user_expire *ue; 2226 struct nlmsghdr *nlh; 2227 2228 nlh = nlmsg_put(skb, c->pid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0); 2229 if (nlh == NULL) 2230 return -EMSGSIZE; 2231 2232 ue = nlmsg_data(nlh); 2233 copy_to_user_state(x, &ue->state); 2234 ue->hard = (c->data.hard != 0) ? 1 : 0; 2235 2236 if (xfrm_mark_put(skb, &x->mark)) 2237 goto nla_put_failure; 2238 2239 return nlmsg_end(skb, nlh); 2240 2241 nla_put_failure: 2242 return -EMSGSIZE; 2243 } 2244 2245 static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c) 2246 { 2247 struct net *net = xs_net(x); 2248 struct sk_buff *skb; 2249 2250 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC); 2251 if (skb == NULL) 2252 return -ENOMEM; 2253 2254 if (build_expire(skb, x, c) < 0) { 2255 kfree_skb(skb); 2256 return -EMSGSIZE; 2257 } 2258 2259 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC); 2260 } 2261 2262 static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c) 2263 { 2264 struct net *net = xs_net(x); 2265 struct sk_buff *skb; 2266 2267 skb = nlmsg_new(xfrm_aevent_msgsize(), GFP_ATOMIC); 2268 if (skb == NULL) 2269 return -ENOMEM; 2270 2271 if (build_aevent(skb, x, c) < 0) 2272 BUG(); 2273 2274 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_AEVENTS, GFP_ATOMIC); 2275 } 2276 2277 static int xfrm_notify_sa_flush(const struct km_event *c) 2278 { 2279 struct net *net = c->net; 2280 struct xfrm_usersa_flush *p; 2281 struct nlmsghdr *nlh; 2282 struct sk_buff *skb; 2283 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush)); 2284 2285 skb = nlmsg_new(len, GFP_ATOMIC); 2286 if (skb == NULL) 2287 return -ENOMEM; 2288 2289 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0); 2290 if (nlh == NULL) { 2291 kfree_skb(skb); 2292 return -EMSGSIZE; 2293 } 2294 2295 p = nlmsg_data(nlh); 2296 p->proto = c->data.proto; 2297 2298 nlmsg_end(skb, nlh); 2299 2300 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC); 2301 } 2302 2303 static inline size_t xfrm_sa_len(struct xfrm_state *x) 2304 { 2305 size_t l = 0; 2306 if (x->aead) 2307 l += nla_total_size(aead_len(x->aead)); 2308 if (x->aalg) { 2309 l += nla_total_size(sizeof(struct xfrm_algo) + 2310 (x->aalg->alg_key_len + 7) / 8); 2311 l += nla_total_size(xfrm_alg_auth_len(x->aalg)); 2312 } 2313 if (x->ealg) 2314 l += nla_total_size(xfrm_alg_len(x->ealg)); 2315 if (x->calg) 2316 l += nla_total_size(sizeof(*x->calg)); 2317 if (x->encap) 2318 l += nla_total_size(sizeof(*x->encap)); 2319 if (x->tfcpad) 2320 l += nla_total_size(sizeof(x->tfcpad)); 2321 if (x->security) 2322 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) + 2323 x->security->ctx_len); 2324 if (x->coaddr) 2325 l += nla_total_size(sizeof(*x->coaddr)); 2326 2327 /* Must count x->lastused as it may become non-zero behind our back. */ 2328 l += nla_total_size(sizeof(u64)); 2329 2330 return l; 2331 } 2332 2333 static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c) 2334 { 2335 struct net *net = xs_net(x); 2336 struct xfrm_usersa_info *p; 2337 struct xfrm_usersa_id *id; 2338 struct nlmsghdr *nlh; 2339 struct sk_buff *skb; 2340 int len = xfrm_sa_len(x); 2341 int headlen; 2342 2343 headlen = sizeof(*p); 2344 if (c->event == XFRM_MSG_DELSA) { 2345 len += nla_total_size(headlen); 2346 headlen = sizeof(*id); 2347 len += nla_total_size(sizeof(struct xfrm_mark)); 2348 } 2349 len += NLMSG_ALIGN(headlen); 2350 2351 skb = nlmsg_new(len, GFP_ATOMIC); 2352 if (skb == NULL) 2353 return -ENOMEM; 2354 2355 nlh = nlmsg_put(skb, c->pid, c->seq, c->event, headlen, 0); 2356 if (nlh == NULL) 2357 goto nla_put_failure; 2358 2359 p = nlmsg_data(nlh); 2360 if (c->event == XFRM_MSG_DELSA) { 2361 struct nlattr *attr; 2362 2363 id = nlmsg_data(nlh); 2364 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr)); 2365 id->spi = x->id.spi; 2366 id->family = x->props.family; 2367 id->proto = x->id.proto; 2368 2369 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p)); 2370 if (attr == NULL) 2371 goto nla_put_failure; 2372 2373 p = nla_data(attr); 2374 } 2375 2376 if (copy_to_user_state_extra(x, p, skb)) 2377 goto nla_put_failure; 2378 2379 nlmsg_end(skb, nlh); 2380 2381 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC); 2382 2383 nla_put_failure: 2384 /* Somebody screwed up with xfrm_sa_len! */ 2385 WARN_ON(1); 2386 kfree_skb(skb); 2387 return -1; 2388 } 2389 2390 static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c) 2391 { 2392 2393 switch (c->event) { 2394 case XFRM_MSG_EXPIRE: 2395 return xfrm_exp_state_notify(x, c); 2396 case XFRM_MSG_NEWAE: 2397 return xfrm_aevent_state_notify(x, c); 2398 case XFRM_MSG_DELSA: 2399 case XFRM_MSG_UPDSA: 2400 case XFRM_MSG_NEWSA: 2401 return xfrm_notify_sa(x, c); 2402 case XFRM_MSG_FLUSHSA: 2403 return xfrm_notify_sa_flush(c); 2404 default: 2405 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n", 2406 c->event); 2407 break; 2408 } 2409 2410 return 0; 2411 2412 } 2413 2414 static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x, 2415 struct xfrm_policy *xp) 2416 { 2417 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire)) 2418 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr) 2419 + nla_total_size(sizeof(struct xfrm_mark)) 2420 + nla_total_size(xfrm_user_sec_ctx_size(x->security)) 2421 + userpolicy_type_attrsize(); 2422 } 2423 2424 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x, 2425 struct xfrm_tmpl *xt, struct xfrm_policy *xp, 2426 int dir) 2427 { 2428 struct xfrm_user_acquire *ua; 2429 struct nlmsghdr *nlh; 2430 __u32 seq = xfrm_get_acqseq(); 2431 2432 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0); 2433 if (nlh == NULL) 2434 return -EMSGSIZE; 2435 2436 ua = nlmsg_data(nlh); 2437 memcpy(&ua->id, &x->id, sizeof(ua->id)); 2438 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr)); 2439 memcpy(&ua->sel, &x->sel, sizeof(ua->sel)); 2440 copy_to_user_policy(xp, &ua->policy, dir); 2441 ua->aalgos = xt->aalgos; 2442 ua->ealgos = xt->ealgos; 2443 ua->calgos = xt->calgos; 2444 ua->seq = x->km.seq = seq; 2445 2446 if (copy_to_user_tmpl(xp, skb) < 0) 2447 goto nlmsg_failure; 2448 if (copy_to_user_state_sec_ctx(x, skb)) 2449 goto nlmsg_failure; 2450 if (copy_to_user_policy_type(xp->type, skb) < 0) 2451 goto nlmsg_failure; 2452 if (xfrm_mark_put(skb, &xp->mark)) 2453 goto nla_put_failure; 2454 2455 return nlmsg_end(skb, nlh); 2456 2457 nla_put_failure: 2458 nlmsg_failure: 2459 nlmsg_cancel(skb, nlh); 2460 return -EMSGSIZE; 2461 } 2462 2463 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt, 2464 struct xfrm_policy *xp, int dir) 2465 { 2466 struct net *net = xs_net(x); 2467 struct sk_buff *skb; 2468 2469 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC); 2470 if (skb == NULL) 2471 return -ENOMEM; 2472 2473 if (build_acquire(skb, x, xt, xp, dir) < 0) 2474 BUG(); 2475 2476 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_ACQUIRE, GFP_ATOMIC); 2477 } 2478 2479 /* User gives us xfrm_user_policy_info followed by an array of 0 2480 * or more templates. 2481 */ 2482 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt, 2483 u8 *data, int len, int *dir) 2484 { 2485 struct net *net = sock_net(sk); 2486 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data; 2487 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1); 2488 struct xfrm_policy *xp; 2489 int nr; 2490 2491 switch (sk->sk_family) { 2492 case AF_INET: 2493 if (opt != IP_XFRM_POLICY) { 2494 *dir = -EOPNOTSUPP; 2495 return NULL; 2496 } 2497 break; 2498 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 2499 case AF_INET6: 2500 if (opt != IPV6_XFRM_POLICY) { 2501 *dir = -EOPNOTSUPP; 2502 return NULL; 2503 } 2504 break; 2505 #endif 2506 default: 2507 *dir = -EINVAL; 2508 return NULL; 2509 } 2510 2511 *dir = -EINVAL; 2512 2513 if (len < sizeof(*p) || 2514 verify_newpolicy_info(p)) 2515 return NULL; 2516 2517 nr = ((len - sizeof(*p)) / sizeof(*ut)); 2518 if (validate_tmpl(nr, ut, p->sel.family)) 2519 return NULL; 2520 2521 if (p->dir > XFRM_POLICY_OUT) 2522 return NULL; 2523 2524 xp = xfrm_policy_alloc(net, GFP_ATOMIC); 2525 if (xp == NULL) { 2526 *dir = -ENOBUFS; 2527 return NULL; 2528 } 2529 2530 copy_from_user_policy(xp, p); 2531 xp->type = XFRM_POLICY_TYPE_MAIN; 2532 copy_templates(xp, ut, nr); 2533 2534 *dir = p->dir; 2535 2536 return xp; 2537 } 2538 2539 static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp) 2540 { 2541 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire)) 2542 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr) 2543 + nla_total_size(xfrm_user_sec_ctx_size(xp->security)) 2544 + nla_total_size(sizeof(struct xfrm_mark)) 2545 + userpolicy_type_attrsize(); 2546 } 2547 2548 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp, 2549 int dir, const struct km_event *c) 2550 { 2551 struct xfrm_user_polexpire *upe; 2552 struct nlmsghdr *nlh; 2553 int hard = c->data.hard; 2554 2555 nlh = nlmsg_put(skb, c->pid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0); 2556 if (nlh == NULL) 2557 return -EMSGSIZE; 2558 2559 upe = nlmsg_data(nlh); 2560 copy_to_user_policy(xp, &upe->pol, dir); 2561 if (copy_to_user_tmpl(xp, skb) < 0) 2562 goto nlmsg_failure; 2563 if (copy_to_user_sec_ctx(xp, skb)) 2564 goto nlmsg_failure; 2565 if (copy_to_user_policy_type(xp->type, skb) < 0) 2566 goto nlmsg_failure; 2567 if (xfrm_mark_put(skb, &xp->mark)) 2568 goto nla_put_failure; 2569 upe->hard = !!hard; 2570 2571 return nlmsg_end(skb, nlh); 2572 2573 nla_put_failure: 2574 nlmsg_failure: 2575 nlmsg_cancel(skb, nlh); 2576 return -EMSGSIZE; 2577 } 2578 2579 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 2580 { 2581 struct net *net = xp_net(xp); 2582 struct sk_buff *skb; 2583 2584 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC); 2585 if (skb == NULL) 2586 return -ENOMEM; 2587 2588 if (build_polexpire(skb, xp, dir, c) < 0) 2589 BUG(); 2590 2591 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC); 2592 } 2593 2594 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c) 2595 { 2596 struct net *net = xp_net(xp); 2597 struct xfrm_userpolicy_info *p; 2598 struct xfrm_userpolicy_id *id; 2599 struct nlmsghdr *nlh; 2600 struct sk_buff *skb; 2601 int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr); 2602 int headlen; 2603 2604 headlen = sizeof(*p); 2605 if (c->event == XFRM_MSG_DELPOLICY) { 2606 len += nla_total_size(headlen); 2607 headlen = sizeof(*id); 2608 } 2609 len += userpolicy_type_attrsize(); 2610 len += nla_total_size(sizeof(struct xfrm_mark)); 2611 len += NLMSG_ALIGN(headlen); 2612 2613 skb = nlmsg_new(len, GFP_ATOMIC); 2614 if (skb == NULL) 2615 return -ENOMEM; 2616 2617 nlh = nlmsg_put(skb, c->pid, c->seq, c->event, headlen, 0); 2618 if (nlh == NULL) 2619 goto nlmsg_failure; 2620 2621 p = nlmsg_data(nlh); 2622 if (c->event == XFRM_MSG_DELPOLICY) { 2623 struct nlattr *attr; 2624 2625 id = nlmsg_data(nlh); 2626 memset(id, 0, sizeof(*id)); 2627 id->dir = dir; 2628 if (c->data.byid) 2629 id->index = xp->index; 2630 else 2631 memcpy(&id->sel, &xp->selector, sizeof(id->sel)); 2632 2633 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p)); 2634 if (attr == NULL) 2635 goto nlmsg_failure; 2636 2637 p = nla_data(attr); 2638 } 2639 2640 copy_to_user_policy(xp, p, dir); 2641 if (copy_to_user_tmpl(xp, skb) < 0) 2642 goto nlmsg_failure; 2643 if (copy_to_user_policy_type(xp->type, skb) < 0) 2644 goto nlmsg_failure; 2645 2646 if (xfrm_mark_put(skb, &xp->mark)) 2647 goto nla_put_failure; 2648 2649 nlmsg_end(skb, nlh); 2650 2651 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC); 2652 2653 nla_put_failure: 2654 nlmsg_failure: 2655 kfree_skb(skb); 2656 return -1; 2657 } 2658 2659 static int xfrm_notify_policy_flush(const struct km_event *c) 2660 { 2661 struct net *net = c->net; 2662 struct nlmsghdr *nlh; 2663 struct sk_buff *skb; 2664 2665 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC); 2666 if (skb == NULL) 2667 return -ENOMEM; 2668 2669 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0); 2670 if (nlh == NULL) 2671 goto nlmsg_failure; 2672 if (copy_to_user_policy_type(c->data.type, skb) < 0) 2673 goto nlmsg_failure; 2674 2675 nlmsg_end(skb, nlh); 2676 2677 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC); 2678 2679 nlmsg_failure: 2680 kfree_skb(skb); 2681 return -1; 2682 } 2683 2684 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 2685 { 2686 2687 switch (c->event) { 2688 case XFRM_MSG_NEWPOLICY: 2689 case XFRM_MSG_UPDPOLICY: 2690 case XFRM_MSG_DELPOLICY: 2691 return xfrm_notify_policy(xp, dir, c); 2692 case XFRM_MSG_FLUSHPOLICY: 2693 return xfrm_notify_policy_flush(c); 2694 case XFRM_MSG_POLEXPIRE: 2695 return xfrm_exp_policy_notify(xp, dir, c); 2696 default: 2697 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n", 2698 c->event); 2699 } 2700 2701 return 0; 2702 2703 } 2704 2705 static inline size_t xfrm_report_msgsize(void) 2706 { 2707 return NLMSG_ALIGN(sizeof(struct xfrm_user_report)); 2708 } 2709 2710 static int build_report(struct sk_buff *skb, u8 proto, 2711 struct xfrm_selector *sel, xfrm_address_t *addr) 2712 { 2713 struct xfrm_user_report *ur; 2714 struct nlmsghdr *nlh; 2715 2716 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0); 2717 if (nlh == NULL) 2718 return -EMSGSIZE; 2719 2720 ur = nlmsg_data(nlh); 2721 ur->proto = proto; 2722 memcpy(&ur->sel, sel, sizeof(ur->sel)); 2723 2724 if (addr) 2725 NLA_PUT(skb, XFRMA_COADDR, sizeof(*addr), addr); 2726 2727 return nlmsg_end(skb, nlh); 2728 2729 nla_put_failure: 2730 nlmsg_cancel(skb, nlh); 2731 return -EMSGSIZE; 2732 } 2733 2734 static int xfrm_send_report(struct net *net, u8 proto, 2735 struct xfrm_selector *sel, xfrm_address_t *addr) 2736 { 2737 struct sk_buff *skb; 2738 2739 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC); 2740 if (skb == NULL) 2741 return -ENOMEM; 2742 2743 if (build_report(skb, proto, sel, addr) < 0) 2744 BUG(); 2745 2746 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_REPORT, GFP_ATOMIC); 2747 } 2748 2749 static inline size_t xfrm_mapping_msgsize(void) 2750 { 2751 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping)); 2752 } 2753 2754 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x, 2755 xfrm_address_t *new_saddr, __be16 new_sport) 2756 { 2757 struct xfrm_user_mapping *um; 2758 struct nlmsghdr *nlh; 2759 2760 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0); 2761 if (nlh == NULL) 2762 return -EMSGSIZE; 2763 2764 um = nlmsg_data(nlh); 2765 2766 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr)); 2767 um->id.spi = x->id.spi; 2768 um->id.family = x->props.family; 2769 um->id.proto = x->id.proto; 2770 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr)); 2771 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr)); 2772 um->new_sport = new_sport; 2773 um->old_sport = x->encap->encap_sport; 2774 um->reqid = x->props.reqid; 2775 2776 return nlmsg_end(skb, nlh); 2777 } 2778 2779 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, 2780 __be16 sport) 2781 { 2782 struct net *net = xs_net(x); 2783 struct sk_buff *skb; 2784 2785 if (x->id.proto != IPPROTO_ESP) 2786 return -EINVAL; 2787 2788 if (!x->encap) 2789 return -EINVAL; 2790 2791 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC); 2792 if (skb == NULL) 2793 return -ENOMEM; 2794 2795 if (build_mapping(skb, x, ipaddr, sport) < 0) 2796 BUG(); 2797 2798 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MAPPING, GFP_ATOMIC); 2799 } 2800 2801 static struct xfrm_mgr netlink_mgr = { 2802 .id = "netlink", 2803 .notify = xfrm_send_state_notify, 2804 .acquire = xfrm_send_acquire, 2805 .compile_policy = xfrm_compile_policy, 2806 .notify_policy = xfrm_send_policy_notify, 2807 .report = xfrm_send_report, 2808 .migrate = xfrm_send_migrate, 2809 .new_mapping = xfrm_send_mapping, 2810 }; 2811 2812 static int __net_init xfrm_user_net_init(struct net *net) 2813 { 2814 struct sock *nlsk; 2815 2816 nlsk = netlink_kernel_create(net, NETLINK_XFRM, XFRMNLGRP_MAX, 2817 xfrm_netlink_rcv, NULL, THIS_MODULE); 2818 if (nlsk == NULL) 2819 return -ENOMEM; 2820 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */ 2821 rcu_assign_pointer(net->xfrm.nlsk, nlsk); 2822 return 0; 2823 } 2824 2825 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list) 2826 { 2827 struct net *net; 2828 list_for_each_entry(net, net_exit_list, exit_list) 2829 rcu_assign_pointer(net->xfrm.nlsk, NULL); 2830 synchronize_net(); 2831 list_for_each_entry(net, net_exit_list, exit_list) 2832 netlink_kernel_release(net->xfrm.nlsk_stash); 2833 } 2834 2835 static struct pernet_operations xfrm_user_net_ops = { 2836 .init = xfrm_user_net_init, 2837 .exit_batch = xfrm_user_net_exit, 2838 }; 2839 2840 static int __init xfrm_user_init(void) 2841 { 2842 int rv; 2843 2844 printk(KERN_INFO "Initializing XFRM netlink socket\n"); 2845 2846 rv = register_pernet_subsys(&xfrm_user_net_ops); 2847 if (rv < 0) 2848 return rv; 2849 rv = xfrm_register_km(&netlink_mgr); 2850 if (rv < 0) 2851 unregister_pernet_subsys(&xfrm_user_net_ops); 2852 return rv; 2853 } 2854 2855 static void __exit xfrm_user_exit(void) 2856 { 2857 xfrm_unregister_km(&netlink_mgr); 2858 unregister_pernet_subsys(&xfrm_user_net_ops); 2859 } 2860 2861 module_init(xfrm_user_init); 2862 module_exit(xfrm_user_exit); 2863 MODULE_LICENSE("GPL"); 2864 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM); 2865 2866