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 <asm/uaccess.h> 30 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 31 #include <linux/in6.h> 32 #endif 33 34 static inline int aead_len(struct xfrm_algo_aead *alg) 35 { 36 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 37 } 38 39 static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type) 40 { 41 struct nlattr *rt = attrs[type]; 42 struct xfrm_algo *algp; 43 44 if (!rt) 45 return 0; 46 47 algp = nla_data(rt); 48 if (nla_len(rt) < xfrm_alg_len(algp)) 49 return -EINVAL; 50 51 switch (type) { 52 case XFRMA_ALG_AUTH: 53 case XFRMA_ALG_CRYPT: 54 case XFRMA_ALG_COMP: 55 break; 56 57 default: 58 return -EINVAL; 59 } 60 61 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0'; 62 return 0; 63 } 64 65 static int verify_auth_trunc(struct nlattr **attrs) 66 { 67 struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC]; 68 struct xfrm_algo_auth *algp; 69 70 if (!rt) 71 return 0; 72 73 algp = nla_data(rt); 74 if (nla_len(rt) < xfrm_alg_auth_len(algp)) 75 return -EINVAL; 76 77 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0'; 78 return 0; 79 } 80 81 static int verify_aead(struct nlattr **attrs) 82 { 83 struct nlattr *rt = attrs[XFRMA_ALG_AEAD]; 84 struct xfrm_algo_aead *algp; 85 86 if (!rt) 87 return 0; 88 89 algp = nla_data(rt); 90 if (nla_len(rt) < aead_len(algp)) 91 return -EINVAL; 92 93 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0'; 94 return 0; 95 } 96 97 static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type, 98 xfrm_address_t **addrp) 99 { 100 struct nlattr *rt = attrs[type]; 101 102 if (rt && addrp) 103 *addrp = nla_data(rt); 104 } 105 106 static inline int verify_sec_ctx_len(struct nlattr **attrs) 107 { 108 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 109 struct xfrm_user_sec_ctx *uctx; 110 111 if (!rt) 112 return 0; 113 114 uctx = nla_data(rt); 115 if (uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len)) 116 return -EINVAL; 117 118 return 0; 119 } 120 121 122 static int verify_newsa_info(struct xfrm_usersa_info *p, 123 struct nlattr **attrs) 124 { 125 int err; 126 127 err = -EINVAL; 128 switch (p->family) { 129 case AF_INET: 130 break; 131 132 case AF_INET6: 133 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 134 break; 135 #else 136 err = -EAFNOSUPPORT; 137 goto out; 138 #endif 139 140 default: 141 goto out; 142 } 143 144 err = -EINVAL; 145 switch (p->id.proto) { 146 case IPPROTO_AH: 147 if ((!attrs[XFRMA_ALG_AUTH] && 148 !attrs[XFRMA_ALG_AUTH_TRUNC]) || 149 attrs[XFRMA_ALG_AEAD] || 150 attrs[XFRMA_ALG_CRYPT] || 151 attrs[XFRMA_ALG_COMP] || 152 attrs[XFRMA_TFCPAD]) 153 goto out; 154 break; 155 156 case IPPROTO_ESP: 157 if (attrs[XFRMA_ALG_COMP]) 158 goto out; 159 if (!attrs[XFRMA_ALG_AUTH] && 160 !attrs[XFRMA_ALG_AUTH_TRUNC] && 161 !attrs[XFRMA_ALG_CRYPT] && 162 !attrs[XFRMA_ALG_AEAD]) 163 goto out; 164 if ((attrs[XFRMA_ALG_AUTH] || 165 attrs[XFRMA_ALG_AUTH_TRUNC] || 166 attrs[XFRMA_ALG_CRYPT]) && 167 attrs[XFRMA_ALG_AEAD]) 168 goto out; 169 if (attrs[XFRMA_TFCPAD] && 170 p->mode != XFRM_MODE_TUNNEL) 171 goto out; 172 break; 173 174 case IPPROTO_COMP: 175 if (!attrs[XFRMA_ALG_COMP] || 176 attrs[XFRMA_ALG_AEAD] || 177 attrs[XFRMA_ALG_AUTH] || 178 attrs[XFRMA_ALG_AUTH_TRUNC] || 179 attrs[XFRMA_ALG_CRYPT] || 180 attrs[XFRMA_TFCPAD]) 181 goto out; 182 break; 183 184 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 185 case IPPROTO_DSTOPTS: 186 case IPPROTO_ROUTING: 187 if (attrs[XFRMA_ALG_COMP] || 188 attrs[XFRMA_ALG_AUTH] || 189 attrs[XFRMA_ALG_AUTH_TRUNC] || 190 attrs[XFRMA_ALG_AEAD] || 191 attrs[XFRMA_ALG_CRYPT] || 192 attrs[XFRMA_ENCAP] || 193 attrs[XFRMA_SEC_CTX] || 194 attrs[XFRMA_TFCPAD] || 195 !attrs[XFRMA_COADDR]) 196 goto out; 197 break; 198 #endif 199 200 default: 201 goto out; 202 } 203 204 if ((err = verify_aead(attrs))) 205 goto out; 206 if ((err = verify_auth_trunc(attrs))) 207 goto out; 208 if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH))) 209 goto out; 210 if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT))) 211 goto out; 212 if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP))) 213 goto out; 214 if ((err = verify_sec_ctx_len(attrs))) 215 goto out; 216 217 err = -EINVAL; 218 switch (p->mode) { 219 case XFRM_MODE_TRANSPORT: 220 case XFRM_MODE_TUNNEL: 221 case XFRM_MODE_ROUTEOPTIMIZATION: 222 case XFRM_MODE_BEET: 223 break; 224 225 default: 226 goto out; 227 } 228 229 err = 0; 230 231 out: 232 return err; 233 } 234 235 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props, 236 struct xfrm_algo_desc *(*get_byname)(char *, int), 237 struct nlattr *rta) 238 { 239 struct xfrm_algo *p, *ualg; 240 struct xfrm_algo_desc *algo; 241 242 if (!rta) 243 return 0; 244 245 ualg = nla_data(rta); 246 247 algo = get_byname(ualg->alg_name, 1); 248 if (!algo) 249 return -ENOSYS; 250 *props = algo->desc.sadb_alg_id; 251 252 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL); 253 if (!p) 254 return -ENOMEM; 255 256 strcpy(p->alg_name, algo->name); 257 *algpp = p; 258 return 0; 259 } 260 261 static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props, 262 struct nlattr *rta) 263 { 264 struct xfrm_algo *ualg; 265 struct xfrm_algo_auth *p; 266 struct xfrm_algo_desc *algo; 267 268 if (!rta) 269 return 0; 270 271 ualg = nla_data(rta); 272 273 algo = xfrm_aalg_get_byname(ualg->alg_name, 1); 274 if (!algo) 275 return -ENOSYS; 276 *props = algo->desc.sadb_alg_id; 277 278 p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL); 279 if (!p) 280 return -ENOMEM; 281 282 strcpy(p->alg_name, algo->name); 283 p->alg_key_len = ualg->alg_key_len; 284 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits; 285 memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8); 286 287 *algpp = p; 288 return 0; 289 } 290 291 static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props, 292 struct nlattr *rta) 293 { 294 struct xfrm_algo_auth *p, *ualg; 295 struct xfrm_algo_desc *algo; 296 297 if (!rta) 298 return 0; 299 300 ualg = nla_data(rta); 301 302 algo = xfrm_aalg_get_byname(ualg->alg_name, 1); 303 if (!algo) 304 return -ENOSYS; 305 if (ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits) 306 return -EINVAL; 307 *props = algo->desc.sadb_alg_id; 308 309 p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL); 310 if (!p) 311 return -ENOMEM; 312 313 strcpy(p->alg_name, algo->name); 314 if (!p->alg_trunc_len) 315 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits; 316 317 *algpp = p; 318 return 0; 319 } 320 321 static int attach_aead(struct xfrm_algo_aead **algpp, u8 *props, 322 struct nlattr *rta) 323 { 324 struct xfrm_algo_aead *p, *ualg; 325 struct xfrm_algo_desc *algo; 326 327 if (!rta) 328 return 0; 329 330 ualg = nla_data(rta); 331 332 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1); 333 if (!algo) 334 return -ENOSYS; 335 *props = algo->desc.sadb_alg_id; 336 337 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL); 338 if (!p) 339 return -ENOMEM; 340 341 strcpy(p->alg_name, algo->name); 342 *algpp = p; 343 return 0; 344 } 345 346 static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx) 347 { 348 int len = 0; 349 350 if (xfrm_ctx) { 351 len += sizeof(struct xfrm_user_sec_ctx); 352 len += xfrm_ctx->ctx_len; 353 } 354 return len; 355 } 356 357 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p) 358 { 359 memcpy(&x->id, &p->id, sizeof(x->id)); 360 memcpy(&x->sel, &p->sel, sizeof(x->sel)); 361 memcpy(&x->lft, &p->lft, sizeof(x->lft)); 362 x->props.mode = p->mode; 363 x->props.replay_window = p->replay_window; 364 x->props.reqid = p->reqid; 365 x->props.family = p->family; 366 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr)); 367 x->props.flags = p->flags; 368 369 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC)) 370 x->sel.family = p->family; 371 } 372 373 /* 374 * someday when pfkey also has support, we could have the code 375 * somehow made shareable and move it to xfrm_state.c - JHS 376 * 377 */ 378 static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs) 379 { 380 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL]; 381 struct nlattr *lt = attrs[XFRMA_LTIME_VAL]; 382 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH]; 383 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH]; 384 385 if (rp) { 386 struct xfrm_replay_state *replay; 387 replay = nla_data(rp); 388 memcpy(&x->replay, replay, sizeof(*replay)); 389 memcpy(&x->preplay, replay, sizeof(*replay)); 390 } 391 392 if (lt) { 393 struct xfrm_lifetime_cur *ltime; 394 ltime = nla_data(lt); 395 x->curlft.bytes = ltime->bytes; 396 x->curlft.packets = ltime->packets; 397 x->curlft.add_time = ltime->add_time; 398 x->curlft.use_time = ltime->use_time; 399 } 400 401 if (et) 402 x->replay_maxage = nla_get_u32(et); 403 404 if (rt) 405 x->replay_maxdiff = nla_get_u32(rt); 406 } 407 408 static struct xfrm_state *xfrm_state_construct(struct net *net, 409 struct xfrm_usersa_info *p, 410 struct nlattr **attrs, 411 int *errp) 412 { 413 struct xfrm_state *x = xfrm_state_alloc(net); 414 int err = -ENOMEM; 415 416 if (!x) 417 goto error_no_put; 418 419 copy_from_user_state(x, p); 420 421 if ((err = attach_aead(&x->aead, &x->props.ealgo, 422 attrs[XFRMA_ALG_AEAD]))) 423 goto error; 424 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo, 425 attrs[XFRMA_ALG_AUTH_TRUNC]))) 426 goto error; 427 if (!x->props.aalgo) { 428 if ((err = attach_auth(&x->aalg, &x->props.aalgo, 429 attrs[XFRMA_ALG_AUTH]))) 430 goto error; 431 } 432 if ((err = attach_one_algo(&x->ealg, &x->props.ealgo, 433 xfrm_ealg_get_byname, 434 attrs[XFRMA_ALG_CRYPT]))) 435 goto error; 436 if ((err = attach_one_algo(&x->calg, &x->props.calgo, 437 xfrm_calg_get_byname, 438 attrs[XFRMA_ALG_COMP]))) 439 goto error; 440 441 if (attrs[XFRMA_ENCAP]) { 442 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]), 443 sizeof(*x->encap), GFP_KERNEL); 444 if (x->encap == NULL) 445 goto error; 446 } 447 448 if (attrs[XFRMA_TFCPAD]) 449 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]); 450 451 if (attrs[XFRMA_COADDR]) { 452 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]), 453 sizeof(*x->coaddr), GFP_KERNEL); 454 if (x->coaddr == NULL) 455 goto error; 456 } 457 458 xfrm_mark_get(attrs, &x->mark); 459 460 err = xfrm_init_state(x); 461 if (err) 462 goto error; 463 464 if (attrs[XFRMA_SEC_CTX] && 465 security_xfrm_state_alloc(x, nla_data(attrs[XFRMA_SEC_CTX]))) 466 goto error; 467 468 x->km.seq = p->seq; 469 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth; 470 /* sysctl_xfrm_aevent_etime is in 100ms units */ 471 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M; 472 x->preplay.bitmap = 0; 473 x->preplay.seq = x->replay.seq+x->replay_maxdiff; 474 x->preplay.oseq = x->replay.oseq +x->replay_maxdiff; 475 476 /* override default values from above */ 477 478 xfrm_update_ae_params(x, attrs); 479 480 return x; 481 482 error: 483 x->km.state = XFRM_STATE_DEAD; 484 xfrm_state_put(x); 485 error_no_put: 486 *errp = err; 487 return NULL; 488 } 489 490 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 491 struct nlattr **attrs) 492 { 493 struct net *net = sock_net(skb->sk); 494 struct xfrm_usersa_info *p = nlmsg_data(nlh); 495 struct xfrm_state *x; 496 int err; 497 struct km_event c; 498 uid_t loginuid = NETLINK_CB(skb).loginuid; 499 u32 sessionid = NETLINK_CB(skb).sessionid; 500 u32 sid = NETLINK_CB(skb).sid; 501 502 err = verify_newsa_info(p, attrs); 503 if (err) 504 return err; 505 506 x = xfrm_state_construct(net, p, attrs, &err); 507 if (!x) 508 return err; 509 510 xfrm_state_hold(x); 511 if (nlh->nlmsg_type == XFRM_MSG_NEWSA) 512 err = xfrm_state_add(x); 513 else 514 err = xfrm_state_update(x); 515 516 xfrm_audit_state_add(x, err ? 0 : 1, loginuid, sessionid, sid); 517 518 if (err < 0) { 519 x->km.state = XFRM_STATE_DEAD; 520 __xfrm_state_put(x); 521 goto out; 522 } 523 524 c.seq = nlh->nlmsg_seq; 525 c.pid = nlh->nlmsg_pid; 526 c.event = nlh->nlmsg_type; 527 528 km_state_notify(x, &c); 529 out: 530 xfrm_state_put(x); 531 return err; 532 } 533 534 static struct xfrm_state *xfrm_user_state_lookup(struct net *net, 535 struct xfrm_usersa_id *p, 536 struct nlattr **attrs, 537 int *errp) 538 { 539 struct xfrm_state *x = NULL; 540 struct xfrm_mark m; 541 int err; 542 u32 mark = xfrm_mark_get(attrs, &m); 543 544 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) { 545 err = -ESRCH; 546 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family); 547 } else { 548 xfrm_address_t *saddr = NULL; 549 550 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr); 551 if (!saddr) { 552 err = -EINVAL; 553 goto out; 554 } 555 556 err = -ESRCH; 557 x = xfrm_state_lookup_byaddr(net, mark, 558 &p->daddr, saddr, 559 p->proto, p->family); 560 } 561 562 out: 563 if (!x && errp) 564 *errp = err; 565 return x; 566 } 567 568 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 569 struct nlattr **attrs) 570 { 571 struct net *net = sock_net(skb->sk); 572 struct xfrm_state *x; 573 int err = -ESRCH; 574 struct km_event c; 575 struct xfrm_usersa_id *p = nlmsg_data(nlh); 576 uid_t loginuid = NETLINK_CB(skb).loginuid; 577 u32 sessionid = NETLINK_CB(skb).sessionid; 578 u32 sid = NETLINK_CB(skb).sid; 579 580 x = xfrm_user_state_lookup(net, p, attrs, &err); 581 if (x == NULL) 582 return err; 583 584 if ((err = security_xfrm_state_delete(x)) != 0) 585 goto out; 586 587 if (xfrm_state_kern(x)) { 588 err = -EPERM; 589 goto out; 590 } 591 592 err = xfrm_state_delete(x); 593 594 if (err < 0) 595 goto out; 596 597 c.seq = nlh->nlmsg_seq; 598 c.pid = nlh->nlmsg_pid; 599 c.event = nlh->nlmsg_type; 600 km_state_notify(x, &c); 601 602 out: 603 xfrm_audit_state_delete(x, err ? 0 : 1, loginuid, sessionid, sid); 604 xfrm_state_put(x); 605 return err; 606 } 607 608 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p) 609 { 610 memcpy(&p->id, &x->id, sizeof(p->id)); 611 memcpy(&p->sel, &x->sel, sizeof(p->sel)); 612 memcpy(&p->lft, &x->lft, sizeof(p->lft)); 613 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft)); 614 memcpy(&p->stats, &x->stats, sizeof(p->stats)); 615 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr)); 616 p->mode = x->props.mode; 617 p->replay_window = x->props.replay_window; 618 p->reqid = x->props.reqid; 619 p->family = x->props.family; 620 p->flags = x->props.flags; 621 p->seq = x->km.seq; 622 } 623 624 struct xfrm_dump_info { 625 struct sk_buff *in_skb; 626 struct sk_buff *out_skb; 627 u32 nlmsg_seq; 628 u16 nlmsg_flags; 629 }; 630 631 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb) 632 { 633 struct xfrm_user_sec_ctx *uctx; 634 struct nlattr *attr; 635 int ctx_size = sizeof(*uctx) + s->ctx_len; 636 637 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size); 638 if (attr == NULL) 639 return -EMSGSIZE; 640 641 uctx = nla_data(attr); 642 uctx->exttype = XFRMA_SEC_CTX; 643 uctx->len = ctx_size; 644 uctx->ctx_doi = s->ctx_doi; 645 uctx->ctx_alg = s->ctx_alg; 646 uctx->ctx_len = s->ctx_len; 647 memcpy(uctx + 1, s->ctx_str, s->ctx_len); 648 649 return 0; 650 } 651 652 static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb) 653 { 654 struct xfrm_algo *algo; 655 struct nlattr *nla; 656 657 nla = nla_reserve(skb, XFRMA_ALG_AUTH, 658 sizeof(*algo) + (auth->alg_key_len + 7) / 8); 659 if (!nla) 660 return -EMSGSIZE; 661 662 algo = nla_data(nla); 663 strcpy(algo->alg_name, auth->alg_name); 664 memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8); 665 algo->alg_key_len = auth->alg_key_len; 666 667 return 0; 668 } 669 670 /* Don't change this without updating xfrm_sa_len! */ 671 static int copy_to_user_state_extra(struct xfrm_state *x, 672 struct xfrm_usersa_info *p, 673 struct sk_buff *skb) 674 { 675 copy_to_user_state(x, p); 676 677 if (x->coaddr) 678 NLA_PUT(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr); 679 680 if (x->lastused) 681 NLA_PUT_U64(skb, XFRMA_LASTUSED, x->lastused); 682 683 if (x->aead) 684 NLA_PUT(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead); 685 if (x->aalg) { 686 if (copy_to_user_auth(x->aalg, skb)) 687 goto nla_put_failure; 688 689 NLA_PUT(skb, XFRMA_ALG_AUTH_TRUNC, 690 xfrm_alg_auth_len(x->aalg), x->aalg); 691 } 692 if (x->ealg) 693 NLA_PUT(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg); 694 if (x->calg) 695 NLA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg); 696 697 if (x->encap) 698 NLA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap); 699 700 if (x->tfcpad) 701 NLA_PUT_U32(skb, XFRMA_TFCPAD, x->tfcpad); 702 703 if (xfrm_mark_put(skb, &x->mark)) 704 goto nla_put_failure; 705 706 if (x->security && copy_sec_ctx(x->security, skb) < 0) 707 goto nla_put_failure; 708 709 return 0; 710 711 nla_put_failure: 712 return -EMSGSIZE; 713 } 714 715 static int dump_one_state(struct xfrm_state *x, int count, void *ptr) 716 { 717 struct xfrm_dump_info *sp = ptr; 718 struct sk_buff *in_skb = sp->in_skb; 719 struct sk_buff *skb = sp->out_skb; 720 struct xfrm_usersa_info *p; 721 struct nlmsghdr *nlh; 722 int err; 723 724 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq, 725 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags); 726 if (nlh == NULL) 727 return -EMSGSIZE; 728 729 p = nlmsg_data(nlh); 730 731 err = copy_to_user_state_extra(x, p, skb); 732 if (err) 733 goto nla_put_failure; 734 735 nlmsg_end(skb, nlh); 736 return 0; 737 738 nla_put_failure: 739 nlmsg_cancel(skb, nlh); 740 return err; 741 } 742 743 static int xfrm_dump_sa_done(struct netlink_callback *cb) 744 { 745 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1]; 746 xfrm_state_walk_done(walk); 747 return 0; 748 } 749 750 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb) 751 { 752 struct net *net = sock_net(skb->sk); 753 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1]; 754 struct xfrm_dump_info info; 755 756 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) > 757 sizeof(cb->args) - sizeof(cb->args[0])); 758 759 info.in_skb = cb->skb; 760 info.out_skb = skb; 761 info.nlmsg_seq = cb->nlh->nlmsg_seq; 762 info.nlmsg_flags = NLM_F_MULTI; 763 764 if (!cb->args[0]) { 765 cb->args[0] = 1; 766 xfrm_state_walk_init(walk, 0); 767 } 768 769 (void) xfrm_state_walk(net, walk, dump_one_state, &info); 770 771 return skb->len; 772 } 773 774 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb, 775 struct xfrm_state *x, u32 seq) 776 { 777 struct xfrm_dump_info info; 778 struct sk_buff *skb; 779 780 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 781 if (!skb) 782 return ERR_PTR(-ENOMEM); 783 784 info.in_skb = in_skb; 785 info.out_skb = skb; 786 info.nlmsg_seq = seq; 787 info.nlmsg_flags = 0; 788 789 if (dump_one_state(x, 0, &info)) { 790 kfree_skb(skb); 791 return NULL; 792 } 793 794 return skb; 795 } 796 797 static inline size_t xfrm_spdinfo_msgsize(void) 798 { 799 return NLMSG_ALIGN(4) 800 + nla_total_size(sizeof(struct xfrmu_spdinfo)) 801 + nla_total_size(sizeof(struct xfrmu_spdhinfo)); 802 } 803 804 static int build_spdinfo(struct sk_buff *skb, struct net *net, 805 u32 pid, u32 seq, u32 flags) 806 { 807 struct xfrmk_spdinfo si; 808 struct xfrmu_spdinfo spc; 809 struct xfrmu_spdhinfo sph; 810 struct nlmsghdr *nlh; 811 u32 *f; 812 813 nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0); 814 if (nlh == NULL) /* shouldnt really happen ... */ 815 return -EMSGSIZE; 816 817 f = nlmsg_data(nlh); 818 *f = flags; 819 xfrm_spd_getinfo(net, &si); 820 spc.incnt = si.incnt; 821 spc.outcnt = si.outcnt; 822 spc.fwdcnt = si.fwdcnt; 823 spc.inscnt = si.inscnt; 824 spc.outscnt = si.outscnt; 825 spc.fwdscnt = si.fwdscnt; 826 sph.spdhcnt = si.spdhcnt; 827 sph.spdhmcnt = si.spdhmcnt; 828 829 NLA_PUT(skb, XFRMA_SPD_INFO, sizeof(spc), &spc); 830 NLA_PUT(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph); 831 832 return nlmsg_end(skb, nlh); 833 834 nla_put_failure: 835 nlmsg_cancel(skb, nlh); 836 return -EMSGSIZE; 837 } 838 839 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh, 840 struct nlattr **attrs) 841 { 842 struct net *net = sock_net(skb->sk); 843 struct sk_buff *r_skb; 844 u32 *flags = nlmsg_data(nlh); 845 u32 spid = NETLINK_CB(skb).pid; 846 u32 seq = nlh->nlmsg_seq; 847 848 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC); 849 if (r_skb == NULL) 850 return -ENOMEM; 851 852 if (build_spdinfo(r_skb, net, spid, seq, *flags) < 0) 853 BUG(); 854 855 return nlmsg_unicast(net->xfrm.nlsk, r_skb, spid); 856 } 857 858 static inline size_t xfrm_sadinfo_msgsize(void) 859 { 860 return NLMSG_ALIGN(4) 861 + nla_total_size(sizeof(struct xfrmu_sadhinfo)) 862 + nla_total_size(4); /* XFRMA_SAD_CNT */ 863 } 864 865 static int build_sadinfo(struct sk_buff *skb, struct net *net, 866 u32 pid, u32 seq, u32 flags) 867 { 868 struct xfrmk_sadinfo si; 869 struct xfrmu_sadhinfo sh; 870 struct nlmsghdr *nlh; 871 u32 *f; 872 873 nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0); 874 if (nlh == NULL) /* shouldnt really happen ... */ 875 return -EMSGSIZE; 876 877 f = nlmsg_data(nlh); 878 *f = flags; 879 xfrm_sad_getinfo(net, &si); 880 881 sh.sadhmcnt = si.sadhmcnt; 882 sh.sadhcnt = si.sadhcnt; 883 884 NLA_PUT_U32(skb, XFRMA_SAD_CNT, si.sadcnt); 885 NLA_PUT(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh); 886 887 return nlmsg_end(skb, nlh); 888 889 nla_put_failure: 890 nlmsg_cancel(skb, nlh); 891 return -EMSGSIZE; 892 } 893 894 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh, 895 struct nlattr **attrs) 896 { 897 struct net *net = sock_net(skb->sk); 898 struct sk_buff *r_skb; 899 u32 *flags = nlmsg_data(nlh); 900 u32 spid = NETLINK_CB(skb).pid; 901 u32 seq = nlh->nlmsg_seq; 902 903 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC); 904 if (r_skb == NULL) 905 return -ENOMEM; 906 907 if (build_sadinfo(r_skb, net, spid, seq, *flags) < 0) 908 BUG(); 909 910 return nlmsg_unicast(net->xfrm.nlsk, r_skb, spid); 911 } 912 913 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 914 struct nlattr **attrs) 915 { 916 struct net *net = sock_net(skb->sk); 917 struct xfrm_usersa_id *p = nlmsg_data(nlh); 918 struct xfrm_state *x; 919 struct sk_buff *resp_skb; 920 int err = -ESRCH; 921 922 x = xfrm_user_state_lookup(net, p, attrs, &err); 923 if (x == NULL) 924 goto out_noput; 925 926 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); 927 if (IS_ERR(resp_skb)) { 928 err = PTR_ERR(resp_skb); 929 } else { 930 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).pid); 931 } 932 xfrm_state_put(x); 933 out_noput: 934 return err; 935 } 936 937 static int verify_userspi_info(struct xfrm_userspi_info *p) 938 { 939 switch (p->info.id.proto) { 940 case IPPROTO_AH: 941 case IPPROTO_ESP: 942 break; 943 944 case IPPROTO_COMP: 945 /* IPCOMP spi is 16-bits. */ 946 if (p->max >= 0x10000) 947 return -EINVAL; 948 break; 949 950 default: 951 return -EINVAL; 952 } 953 954 if (p->min > p->max) 955 return -EINVAL; 956 957 return 0; 958 } 959 960 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh, 961 struct nlattr **attrs) 962 { 963 struct net *net = sock_net(skb->sk); 964 struct xfrm_state *x; 965 struct xfrm_userspi_info *p; 966 struct sk_buff *resp_skb; 967 xfrm_address_t *daddr; 968 int family; 969 int err; 970 u32 mark; 971 struct xfrm_mark m; 972 973 p = nlmsg_data(nlh); 974 err = verify_userspi_info(p); 975 if (err) 976 goto out_noput; 977 978 family = p->info.family; 979 daddr = &p->info.id.daddr; 980 981 x = NULL; 982 983 mark = xfrm_mark_get(attrs, &m); 984 if (p->info.seq) { 985 x = xfrm_find_acq_byseq(net, mark, p->info.seq); 986 if (x && xfrm_addr_cmp(&x->id.daddr, daddr, family)) { 987 xfrm_state_put(x); 988 x = NULL; 989 } 990 } 991 992 if (!x) 993 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid, 994 p->info.id.proto, daddr, 995 &p->info.saddr, 1, 996 family); 997 err = -ENOENT; 998 if (x == NULL) 999 goto out_noput; 1000 1001 err = xfrm_alloc_spi(x, p->min, p->max); 1002 if (err) 1003 goto out; 1004 1005 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); 1006 if (IS_ERR(resp_skb)) { 1007 err = PTR_ERR(resp_skb); 1008 goto out; 1009 } 1010 1011 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).pid); 1012 1013 out: 1014 xfrm_state_put(x); 1015 out_noput: 1016 return err; 1017 } 1018 1019 static int verify_policy_dir(u8 dir) 1020 { 1021 switch (dir) { 1022 case XFRM_POLICY_IN: 1023 case XFRM_POLICY_OUT: 1024 case XFRM_POLICY_FWD: 1025 break; 1026 1027 default: 1028 return -EINVAL; 1029 } 1030 1031 return 0; 1032 } 1033 1034 static int verify_policy_type(u8 type) 1035 { 1036 switch (type) { 1037 case XFRM_POLICY_TYPE_MAIN: 1038 #ifdef CONFIG_XFRM_SUB_POLICY 1039 case XFRM_POLICY_TYPE_SUB: 1040 #endif 1041 break; 1042 1043 default: 1044 return -EINVAL; 1045 } 1046 1047 return 0; 1048 } 1049 1050 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p) 1051 { 1052 switch (p->share) { 1053 case XFRM_SHARE_ANY: 1054 case XFRM_SHARE_SESSION: 1055 case XFRM_SHARE_USER: 1056 case XFRM_SHARE_UNIQUE: 1057 break; 1058 1059 default: 1060 return -EINVAL; 1061 } 1062 1063 switch (p->action) { 1064 case XFRM_POLICY_ALLOW: 1065 case XFRM_POLICY_BLOCK: 1066 break; 1067 1068 default: 1069 return -EINVAL; 1070 } 1071 1072 switch (p->sel.family) { 1073 case AF_INET: 1074 break; 1075 1076 case AF_INET6: 1077 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 1078 break; 1079 #else 1080 return -EAFNOSUPPORT; 1081 #endif 1082 1083 default: 1084 return -EINVAL; 1085 } 1086 1087 return verify_policy_dir(p->dir); 1088 } 1089 1090 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs) 1091 { 1092 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 1093 struct xfrm_user_sec_ctx *uctx; 1094 1095 if (!rt) 1096 return 0; 1097 1098 uctx = nla_data(rt); 1099 return security_xfrm_policy_alloc(&pol->security, uctx); 1100 } 1101 1102 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut, 1103 int nr) 1104 { 1105 int i; 1106 1107 xp->xfrm_nr = nr; 1108 for (i = 0; i < nr; i++, ut++) { 1109 struct xfrm_tmpl *t = &xp->xfrm_vec[i]; 1110 1111 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id)); 1112 memcpy(&t->saddr, &ut->saddr, 1113 sizeof(xfrm_address_t)); 1114 t->reqid = ut->reqid; 1115 t->mode = ut->mode; 1116 t->share = ut->share; 1117 t->optional = ut->optional; 1118 t->aalgos = ut->aalgos; 1119 t->ealgos = ut->ealgos; 1120 t->calgos = ut->calgos; 1121 /* If all masks are ~0, then we allow all algorithms. */ 1122 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos); 1123 t->encap_family = ut->family; 1124 } 1125 } 1126 1127 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family) 1128 { 1129 int i; 1130 1131 if (nr > XFRM_MAX_DEPTH) 1132 return -EINVAL; 1133 1134 for (i = 0; i < nr; i++) { 1135 /* We never validated the ut->family value, so many 1136 * applications simply leave it at zero. The check was 1137 * never made and ut->family was ignored because all 1138 * templates could be assumed to have the same family as 1139 * the policy itself. Now that we will have ipv4-in-ipv6 1140 * and ipv6-in-ipv4 tunnels, this is no longer true. 1141 */ 1142 if (!ut[i].family) 1143 ut[i].family = family; 1144 1145 switch (ut[i].family) { 1146 case AF_INET: 1147 break; 1148 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 1149 case AF_INET6: 1150 break; 1151 #endif 1152 default: 1153 return -EINVAL; 1154 } 1155 } 1156 1157 return 0; 1158 } 1159 1160 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs) 1161 { 1162 struct nlattr *rt = attrs[XFRMA_TMPL]; 1163 1164 if (!rt) { 1165 pol->xfrm_nr = 0; 1166 } else { 1167 struct xfrm_user_tmpl *utmpl = nla_data(rt); 1168 int nr = nla_len(rt) / sizeof(*utmpl); 1169 int err; 1170 1171 err = validate_tmpl(nr, utmpl, pol->family); 1172 if (err) 1173 return err; 1174 1175 copy_templates(pol, utmpl, nr); 1176 } 1177 return 0; 1178 } 1179 1180 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs) 1181 { 1182 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE]; 1183 struct xfrm_userpolicy_type *upt; 1184 u8 type = XFRM_POLICY_TYPE_MAIN; 1185 int err; 1186 1187 if (rt) { 1188 upt = nla_data(rt); 1189 type = upt->type; 1190 } 1191 1192 err = verify_policy_type(type); 1193 if (err) 1194 return err; 1195 1196 *tp = type; 1197 return 0; 1198 } 1199 1200 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p) 1201 { 1202 xp->priority = p->priority; 1203 xp->index = p->index; 1204 memcpy(&xp->selector, &p->sel, sizeof(xp->selector)); 1205 memcpy(&xp->lft, &p->lft, sizeof(xp->lft)); 1206 xp->action = p->action; 1207 xp->flags = p->flags; 1208 xp->family = p->sel.family; 1209 /* XXX xp->share = p->share; */ 1210 } 1211 1212 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir) 1213 { 1214 memcpy(&p->sel, &xp->selector, sizeof(p->sel)); 1215 memcpy(&p->lft, &xp->lft, sizeof(p->lft)); 1216 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft)); 1217 p->priority = xp->priority; 1218 p->index = xp->index; 1219 p->sel.family = xp->family; 1220 p->dir = dir; 1221 p->action = xp->action; 1222 p->flags = xp->flags; 1223 p->share = XFRM_SHARE_ANY; /* XXX xp->share */ 1224 } 1225 1226 static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp) 1227 { 1228 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL); 1229 int err; 1230 1231 if (!xp) { 1232 *errp = -ENOMEM; 1233 return NULL; 1234 } 1235 1236 copy_from_user_policy(xp, p); 1237 1238 err = copy_from_user_policy_type(&xp->type, attrs); 1239 if (err) 1240 goto error; 1241 1242 if (!(err = copy_from_user_tmpl(xp, attrs))) 1243 err = copy_from_user_sec_ctx(xp, attrs); 1244 if (err) 1245 goto error; 1246 1247 xfrm_mark_get(attrs, &xp->mark); 1248 1249 return xp; 1250 error: 1251 *errp = err; 1252 xp->walk.dead = 1; 1253 xfrm_policy_destroy(xp); 1254 return NULL; 1255 } 1256 1257 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 1258 struct nlattr **attrs) 1259 { 1260 struct net *net = sock_net(skb->sk); 1261 struct xfrm_userpolicy_info *p = nlmsg_data(nlh); 1262 struct xfrm_policy *xp; 1263 struct km_event c; 1264 int err; 1265 int excl; 1266 uid_t loginuid = NETLINK_CB(skb).loginuid; 1267 u32 sessionid = NETLINK_CB(skb).sessionid; 1268 u32 sid = NETLINK_CB(skb).sid; 1269 1270 err = verify_newpolicy_info(p); 1271 if (err) 1272 return err; 1273 err = verify_sec_ctx_len(attrs); 1274 if (err) 1275 return err; 1276 1277 xp = xfrm_policy_construct(net, p, attrs, &err); 1278 if (!xp) 1279 return err; 1280 1281 /* shouldnt excl be based on nlh flags?? 1282 * Aha! this is anti-netlink really i.e more pfkey derived 1283 * in netlink excl is a flag and you wouldnt need 1284 * a type XFRM_MSG_UPDPOLICY - JHS */ 1285 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY; 1286 err = xfrm_policy_insert(p->dir, xp, excl); 1287 xfrm_audit_policy_add(xp, err ? 0 : 1, loginuid, sessionid, sid); 1288 1289 if (err) { 1290 security_xfrm_policy_free(xp->security); 1291 kfree(xp); 1292 return err; 1293 } 1294 1295 c.event = nlh->nlmsg_type; 1296 c.seq = nlh->nlmsg_seq; 1297 c.pid = nlh->nlmsg_pid; 1298 km_policy_notify(xp, p->dir, &c); 1299 1300 xfrm_pol_put(xp); 1301 1302 return 0; 1303 } 1304 1305 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb) 1306 { 1307 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH]; 1308 int i; 1309 1310 if (xp->xfrm_nr == 0) 1311 return 0; 1312 1313 for (i = 0; i < xp->xfrm_nr; i++) { 1314 struct xfrm_user_tmpl *up = &vec[i]; 1315 struct xfrm_tmpl *kp = &xp->xfrm_vec[i]; 1316 1317 memcpy(&up->id, &kp->id, sizeof(up->id)); 1318 up->family = kp->encap_family; 1319 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr)); 1320 up->reqid = kp->reqid; 1321 up->mode = kp->mode; 1322 up->share = kp->share; 1323 up->optional = kp->optional; 1324 up->aalgos = kp->aalgos; 1325 up->ealgos = kp->ealgos; 1326 up->calgos = kp->calgos; 1327 } 1328 1329 return nla_put(skb, XFRMA_TMPL, 1330 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec); 1331 } 1332 1333 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb) 1334 { 1335 if (x->security) { 1336 return copy_sec_ctx(x->security, skb); 1337 } 1338 return 0; 1339 } 1340 1341 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb) 1342 { 1343 if (xp->security) { 1344 return copy_sec_ctx(xp->security, skb); 1345 } 1346 return 0; 1347 } 1348 static inline size_t userpolicy_type_attrsize(void) 1349 { 1350 #ifdef CONFIG_XFRM_SUB_POLICY 1351 return nla_total_size(sizeof(struct xfrm_userpolicy_type)); 1352 #else 1353 return 0; 1354 #endif 1355 } 1356 1357 #ifdef CONFIG_XFRM_SUB_POLICY 1358 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb) 1359 { 1360 struct xfrm_userpolicy_type upt = { 1361 .type = type, 1362 }; 1363 1364 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt); 1365 } 1366 1367 #else 1368 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb) 1369 { 1370 return 0; 1371 } 1372 #endif 1373 1374 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr) 1375 { 1376 struct xfrm_dump_info *sp = ptr; 1377 struct xfrm_userpolicy_info *p; 1378 struct sk_buff *in_skb = sp->in_skb; 1379 struct sk_buff *skb = sp->out_skb; 1380 struct nlmsghdr *nlh; 1381 1382 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq, 1383 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags); 1384 if (nlh == NULL) 1385 return -EMSGSIZE; 1386 1387 p = nlmsg_data(nlh); 1388 copy_to_user_policy(xp, p, dir); 1389 if (copy_to_user_tmpl(xp, skb) < 0) 1390 goto nlmsg_failure; 1391 if (copy_to_user_sec_ctx(xp, skb)) 1392 goto nlmsg_failure; 1393 if (copy_to_user_policy_type(xp->type, skb) < 0) 1394 goto nlmsg_failure; 1395 if (xfrm_mark_put(skb, &xp->mark)) 1396 goto nla_put_failure; 1397 1398 nlmsg_end(skb, nlh); 1399 return 0; 1400 1401 nla_put_failure: 1402 nlmsg_failure: 1403 nlmsg_cancel(skb, nlh); 1404 return -EMSGSIZE; 1405 } 1406 1407 static int xfrm_dump_policy_done(struct netlink_callback *cb) 1408 { 1409 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1]; 1410 1411 xfrm_policy_walk_done(walk); 1412 return 0; 1413 } 1414 1415 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb) 1416 { 1417 struct net *net = sock_net(skb->sk); 1418 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1]; 1419 struct xfrm_dump_info info; 1420 1421 BUILD_BUG_ON(sizeof(struct xfrm_policy_walk) > 1422 sizeof(cb->args) - sizeof(cb->args[0])); 1423 1424 info.in_skb = cb->skb; 1425 info.out_skb = skb; 1426 info.nlmsg_seq = cb->nlh->nlmsg_seq; 1427 info.nlmsg_flags = NLM_F_MULTI; 1428 1429 if (!cb->args[0]) { 1430 cb->args[0] = 1; 1431 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY); 1432 } 1433 1434 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info); 1435 1436 return skb->len; 1437 } 1438 1439 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb, 1440 struct xfrm_policy *xp, 1441 int dir, u32 seq) 1442 { 1443 struct xfrm_dump_info info; 1444 struct sk_buff *skb; 1445 1446 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1447 if (!skb) 1448 return ERR_PTR(-ENOMEM); 1449 1450 info.in_skb = in_skb; 1451 info.out_skb = skb; 1452 info.nlmsg_seq = seq; 1453 info.nlmsg_flags = 0; 1454 1455 if (dump_one_policy(xp, dir, 0, &info) < 0) { 1456 kfree_skb(skb); 1457 return NULL; 1458 } 1459 1460 return skb; 1461 } 1462 1463 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 1464 struct nlattr **attrs) 1465 { 1466 struct net *net = sock_net(skb->sk); 1467 struct xfrm_policy *xp; 1468 struct xfrm_userpolicy_id *p; 1469 u8 type = XFRM_POLICY_TYPE_MAIN; 1470 int err; 1471 struct km_event c; 1472 int delete; 1473 struct xfrm_mark m; 1474 u32 mark = xfrm_mark_get(attrs, &m); 1475 1476 p = nlmsg_data(nlh); 1477 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY; 1478 1479 err = copy_from_user_policy_type(&type, attrs); 1480 if (err) 1481 return err; 1482 1483 err = verify_policy_dir(p->dir); 1484 if (err) 1485 return err; 1486 1487 if (p->index) 1488 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err); 1489 else { 1490 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 1491 struct xfrm_sec_ctx *ctx; 1492 1493 err = verify_sec_ctx_len(attrs); 1494 if (err) 1495 return err; 1496 1497 ctx = NULL; 1498 if (rt) { 1499 struct xfrm_user_sec_ctx *uctx = nla_data(rt); 1500 1501 err = security_xfrm_policy_alloc(&ctx, uctx); 1502 if (err) 1503 return err; 1504 } 1505 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel, 1506 ctx, delete, &err); 1507 security_xfrm_policy_free(ctx); 1508 } 1509 if (xp == NULL) 1510 return -ENOENT; 1511 1512 if (!delete) { 1513 struct sk_buff *resp_skb; 1514 1515 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq); 1516 if (IS_ERR(resp_skb)) { 1517 err = PTR_ERR(resp_skb); 1518 } else { 1519 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, 1520 NETLINK_CB(skb).pid); 1521 } 1522 } else { 1523 uid_t loginuid = NETLINK_CB(skb).loginuid; 1524 u32 sessionid = NETLINK_CB(skb).sessionid; 1525 u32 sid = NETLINK_CB(skb).sid; 1526 1527 xfrm_audit_policy_delete(xp, err ? 0 : 1, loginuid, sessionid, 1528 sid); 1529 1530 if (err != 0) 1531 goto out; 1532 1533 c.data.byid = p->index; 1534 c.event = nlh->nlmsg_type; 1535 c.seq = nlh->nlmsg_seq; 1536 c.pid = nlh->nlmsg_pid; 1537 km_policy_notify(xp, p->dir, &c); 1538 } 1539 1540 out: 1541 xfrm_pol_put(xp); 1542 return err; 1543 } 1544 1545 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 1546 struct nlattr **attrs) 1547 { 1548 struct net *net = sock_net(skb->sk); 1549 struct km_event c; 1550 struct xfrm_usersa_flush *p = nlmsg_data(nlh); 1551 struct xfrm_audit audit_info; 1552 int err; 1553 1554 audit_info.loginuid = NETLINK_CB(skb).loginuid; 1555 audit_info.sessionid = NETLINK_CB(skb).sessionid; 1556 audit_info.secid = NETLINK_CB(skb).sid; 1557 err = xfrm_state_flush(net, p->proto, &audit_info); 1558 if (err) { 1559 if (err == -ESRCH) /* empty table */ 1560 return 0; 1561 return err; 1562 } 1563 c.data.proto = p->proto; 1564 c.event = nlh->nlmsg_type; 1565 c.seq = nlh->nlmsg_seq; 1566 c.pid = nlh->nlmsg_pid; 1567 c.net = net; 1568 km_state_notify(NULL, &c); 1569 1570 return 0; 1571 } 1572 1573 static inline size_t xfrm_aevent_msgsize(void) 1574 { 1575 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id)) 1576 + nla_total_size(sizeof(struct xfrm_replay_state)) 1577 + nla_total_size(sizeof(struct xfrm_lifetime_cur)) 1578 + nla_total_size(sizeof(struct xfrm_mark)) 1579 + nla_total_size(4) /* XFRM_AE_RTHR */ 1580 + nla_total_size(4); /* XFRM_AE_ETHR */ 1581 } 1582 1583 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c) 1584 { 1585 struct xfrm_aevent_id *id; 1586 struct nlmsghdr *nlh; 1587 1588 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0); 1589 if (nlh == NULL) 1590 return -EMSGSIZE; 1591 1592 id = nlmsg_data(nlh); 1593 memcpy(&id->sa_id.daddr, &x->id.daddr,sizeof(x->id.daddr)); 1594 id->sa_id.spi = x->id.spi; 1595 id->sa_id.family = x->props.family; 1596 id->sa_id.proto = x->id.proto; 1597 memcpy(&id->saddr, &x->props.saddr,sizeof(x->props.saddr)); 1598 id->reqid = x->props.reqid; 1599 id->flags = c->data.aevent; 1600 1601 NLA_PUT(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), &x->replay); 1602 NLA_PUT(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft); 1603 1604 if (id->flags & XFRM_AE_RTHR) 1605 NLA_PUT_U32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff); 1606 1607 if (id->flags & XFRM_AE_ETHR) 1608 NLA_PUT_U32(skb, XFRMA_ETIMER_THRESH, 1609 x->replay_maxage * 10 / HZ); 1610 1611 if (xfrm_mark_put(skb, &x->mark)) 1612 goto nla_put_failure; 1613 1614 return nlmsg_end(skb, nlh); 1615 1616 nla_put_failure: 1617 nlmsg_cancel(skb, nlh); 1618 return -EMSGSIZE; 1619 } 1620 1621 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh, 1622 struct nlattr **attrs) 1623 { 1624 struct net *net = sock_net(skb->sk); 1625 struct xfrm_state *x; 1626 struct sk_buff *r_skb; 1627 int err; 1628 struct km_event c; 1629 u32 mark; 1630 struct xfrm_mark m; 1631 struct xfrm_aevent_id *p = nlmsg_data(nlh); 1632 struct xfrm_usersa_id *id = &p->sa_id; 1633 1634 r_skb = nlmsg_new(xfrm_aevent_msgsize(), GFP_ATOMIC); 1635 if (r_skb == NULL) 1636 return -ENOMEM; 1637 1638 mark = xfrm_mark_get(attrs, &m); 1639 1640 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family); 1641 if (x == NULL) { 1642 kfree_skb(r_skb); 1643 return -ESRCH; 1644 } 1645 1646 /* 1647 * XXX: is this lock really needed - none of the other 1648 * gets lock (the concern is things getting updated 1649 * while we are still reading) - jhs 1650 */ 1651 spin_lock_bh(&x->lock); 1652 c.data.aevent = p->flags; 1653 c.seq = nlh->nlmsg_seq; 1654 c.pid = nlh->nlmsg_pid; 1655 1656 if (build_aevent(r_skb, x, &c) < 0) 1657 BUG(); 1658 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).pid); 1659 spin_unlock_bh(&x->lock); 1660 xfrm_state_put(x); 1661 return err; 1662 } 1663 1664 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh, 1665 struct nlattr **attrs) 1666 { 1667 struct net *net = sock_net(skb->sk); 1668 struct xfrm_state *x; 1669 struct km_event c; 1670 int err = - EINVAL; 1671 u32 mark = 0; 1672 struct xfrm_mark m; 1673 struct xfrm_aevent_id *p = nlmsg_data(nlh); 1674 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL]; 1675 struct nlattr *lt = attrs[XFRMA_LTIME_VAL]; 1676 1677 if (!lt && !rp) 1678 return err; 1679 1680 /* pedantic mode - thou shalt sayeth replaceth */ 1681 if (!(nlh->nlmsg_flags&NLM_F_REPLACE)) 1682 return err; 1683 1684 mark = xfrm_mark_get(attrs, &m); 1685 1686 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family); 1687 if (x == NULL) 1688 return -ESRCH; 1689 1690 if (x->km.state != XFRM_STATE_VALID) 1691 goto out; 1692 1693 spin_lock_bh(&x->lock); 1694 xfrm_update_ae_params(x, attrs); 1695 spin_unlock_bh(&x->lock); 1696 1697 c.event = nlh->nlmsg_type; 1698 c.seq = nlh->nlmsg_seq; 1699 c.pid = nlh->nlmsg_pid; 1700 c.data.aevent = XFRM_AE_CU; 1701 km_state_notify(x, &c); 1702 err = 0; 1703 out: 1704 xfrm_state_put(x); 1705 return err; 1706 } 1707 1708 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 1709 struct nlattr **attrs) 1710 { 1711 struct net *net = sock_net(skb->sk); 1712 struct km_event c; 1713 u8 type = XFRM_POLICY_TYPE_MAIN; 1714 int err; 1715 struct xfrm_audit audit_info; 1716 1717 err = copy_from_user_policy_type(&type, attrs); 1718 if (err) 1719 return err; 1720 1721 audit_info.loginuid = NETLINK_CB(skb).loginuid; 1722 audit_info.sessionid = NETLINK_CB(skb).sessionid; 1723 audit_info.secid = NETLINK_CB(skb).sid; 1724 err = xfrm_policy_flush(net, type, &audit_info); 1725 if (err) { 1726 if (err == -ESRCH) /* empty table */ 1727 return 0; 1728 return err; 1729 } 1730 1731 c.data.type = type; 1732 c.event = nlh->nlmsg_type; 1733 c.seq = nlh->nlmsg_seq; 1734 c.pid = nlh->nlmsg_pid; 1735 c.net = net; 1736 km_policy_notify(NULL, 0, &c); 1737 return 0; 1738 } 1739 1740 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh, 1741 struct nlattr **attrs) 1742 { 1743 struct net *net = sock_net(skb->sk); 1744 struct xfrm_policy *xp; 1745 struct xfrm_user_polexpire *up = nlmsg_data(nlh); 1746 struct xfrm_userpolicy_info *p = &up->pol; 1747 u8 type = XFRM_POLICY_TYPE_MAIN; 1748 int err = -ENOENT; 1749 struct xfrm_mark m; 1750 u32 mark = xfrm_mark_get(attrs, &m); 1751 1752 err = copy_from_user_policy_type(&type, attrs); 1753 if (err) 1754 return err; 1755 1756 err = verify_policy_dir(p->dir); 1757 if (err) 1758 return err; 1759 1760 if (p->index) 1761 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err); 1762 else { 1763 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 1764 struct xfrm_sec_ctx *ctx; 1765 1766 err = verify_sec_ctx_len(attrs); 1767 if (err) 1768 return err; 1769 1770 ctx = NULL; 1771 if (rt) { 1772 struct xfrm_user_sec_ctx *uctx = nla_data(rt); 1773 1774 err = security_xfrm_policy_alloc(&ctx, uctx); 1775 if (err) 1776 return err; 1777 } 1778 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, 1779 &p->sel, ctx, 0, &err); 1780 security_xfrm_policy_free(ctx); 1781 } 1782 if (xp == NULL) 1783 return -ENOENT; 1784 1785 if (unlikely(xp->walk.dead)) 1786 goto out; 1787 1788 err = 0; 1789 if (up->hard) { 1790 uid_t loginuid = NETLINK_CB(skb).loginuid; 1791 uid_t sessionid = NETLINK_CB(skb).sessionid; 1792 u32 sid = NETLINK_CB(skb).sid; 1793 xfrm_policy_delete(xp, p->dir); 1794 xfrm_audit_policy_delete(xp, 1, loginuid, sessionid, sid); 1795 1796 } else { 1797 // reset the timers here? 1798 WARN(1, "Dont know what to do with soft policy expire\n"); 1799 } 1800 km_policy_expired(xp, p->dir, up->hard, current->pid); 1801 1802 out: 1803 xfrm_pol_put(xp); 1804 return err; 1805 } 1806 1807 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh, 1808 struct nlattr **attrs) 1809 { 1810 struct net *net = sock_net(skb->sk); 1811 struct xfrm_state *x; 1812 int err; 1813 struct xfrm_user_expire *ue = nlmsg_data(nlh); 1814 struct xfrm_usersa_info *p = &ue->state; 1815 struct xfrm_mark m; 1816 u32 mark = xfrm_mark_get(attrs, &m); 1817 1818 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family); 1819 1820 err = -ENOENT; 1821 if (x == NULL) 1822 return err; 1823 1824 spin_lock_bh(&x->lock); 1825 err = -EINVAL; 1826 if (x->km.state != XFRM_STATE_VALID) 1827 goto out; 1828 km_state_expired(x, ue->hard, current->pid); 1829 1830 if (ue->hard) { 1831 uid_t loginuid = NETLINK_CB(skb).loginuid; 1832 uid_t sessionid = NETLINK_CB(skb).sessionid; 1833 u32 sid = NETLINK_CB(skb).sid; 1834 __xfrm_state_delete(x); 1835 xfrm_audit_state_delete(x, 1, loginuid, sessionid, sid); 1836 } 1837 err = 0; 1838 out: 1839 spin_unlock_bh(&x->lock); 1840 xfrm_state_put(x); 1841 return err; 1842 } 1843 1844 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh, 1845 struct nlattr **attrs) 1846 { 1847 struct net *net = sock_net(skb->sk); 1848 struct xfrm_policy *xp; 1849 struct xfrm_user_tmpl *ut; 1850 int i; 1851 struct nlattr *rt = attrs[XFRMA_TMPL]; 1852 struct xfrm_mark mark; 1853 1854 struct xfrm_user_acquire *ua = nlmsg_data(nlh); 1855 struct xfrm_state *x = xfrm_state_alloc(net); 1856 int err = -ENOMEM; 1857 1858 if (!x) 1859 goto nomem; 1860 1861 xfrm_mark_get(attrs, &mark); 1862 1863 err = verify_newpolicy_info(&ua->policy); 1864 if (err) 1865 goto bad_policy; 1866 1867 /* build an XP */ 1868 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err); 1869 if (!xp) 1870 goto free_state; 1871 1872 memcpy(&x->id, &ua->id, sizeof(ua->id)); 1873 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr)); 1874 memcpy(&x->sel, &ua->sel, sizeof(ua->sel)); 1875 xp->mark.m = x->mark.m = mark.m; 1876 xp->mark.v = x->mark.v = mark.v; 1877 ut = nla_data(rt); 1878 /* extract the templates and for each call km_key */ 1879 for (i = 0; i < xp->xfrm_nr; i++, ut++) { 1880 struct xfrm_tmpl *t = &xp->xfrm_vec[i]; 1881 memcpy(&x->id, &t->id, sizeof(x->id)); 1882 x->props.mode = t->mode; 1883 x->props.reqid = t->reqid; 1884 x->props.family = ut->family; 1885 t->aalgos = ua->aalgos; 1886 t->ealgos = ua->ealgos; 1887 t->calgos = ua->calgos; 1888 err = km_query(x, t, xp); 1889 1890 } 1891 1892 kfree(x); 1893 kfree(xp); 1894 1895 return 0; 1896 1897 bad_policy: 1898 WARN(1, "BAD policy passed\n"); 1899 free_state: 1900 kfree(x); 1901 nomem: 1902 return err; 1903 } 1904 1905 #ifdef CONFIG_XFRM_MIGRATE 1906 static int copy_from_user_migrate(struct xfrm_migrate *ma, 1907 struct xfrm_kmaddress *k, 1908 struct nlattr **attrs, int *num) 1909 { 1910 struct nlattr *rt = attrs[XFRMA_MIGRATE]; 1911 struct xfrm_user_migrate *um; 1912 int i, num_migrate; 1913 1914 if (k != NULL) { 1915 struct xfrm_user_kmaddress *uk; 1916 1917 uk = nla_data(attrs[XFRMA_KMADDRESS]); 1918 memcpy(&k->local, &uk->local, sizeof(k->local)); 1919 memcpy(&k->remote, &uk->remote, sizeof(k->remote)); 1920 k->family = uk->family; 1921 k->reserved = uk->reserved; 1922 } 1923 1924 um = nla_data(rt); 1925 num_migrate = nla_len(rt) / sizeof(*um); 1926 1927 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH) 1928 return -EINVAL; 1929 1930 for (i = 0; i < num_migrate; i++, um++, ma++) { 1931 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr)); 1932 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr)); 1933 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr)); 1934 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr)); 1935 1936 ma->proto = um->proto; 1937 ma->mode = um->mode; 1938 ma->reqid = um->reqid; 1939 1940 ma->old_family = um->old_family; 1941 ma->new_family = um->new_family; 1942 } 1943 1944 *num = i; 1945 return 0; 1946 } 1947 1948 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh, 1949 struct nlattr **attrs) 1950 { 1951 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh); 1952 struct xfrm_migrate m[XFRM_MAX_DEPTH]; 1953 struct xfrm_kmaddress km, *kmp; 1954 u8 type; 1955 int err; 1956 int n = 0; 1957 1958 if (attrs[XFRMA_MIGRATE] == NULL) 1959 return -EINVAL; 1960 1961 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL; 1962 1963 err = copy_from_user_policy_type(&type, attrs); 1964 if (err) 1965 return err; 1966 1967 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n); 1968 if (err) 1969 return err; 1970 1971 if (!n) 1972 return 0; 1973 1974 xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp); 1975 1976 return 0; 1977 } 1978 #else 1979 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh, 1980 struct nlattr **attrs) 1981 { 1982 return -ENOPROTOOPT; 1983 } 1984 #endif 1985 1986 #ifdef CONFIG_XFRM_MIGRATE 1987 static int copy_to_user_migrate(struct xfrm_migrate *m, struct sk_buff *skb) 1988 { 1989 struct xfrm_user_migrate um; 1990 1991 memset(&um, 0, sizeof(um)); 1992 um.proto = m->proto; 1993 um.mode = m->mode; 1994 um.reqid = m->reqid; 1995 um.old_family = m->old_family; 1996 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr)); 1997 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr)); 1998 um.new_family = m->new_family; 1999 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr)); 2000 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr)); 2001 2002 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um); 2003 } 2004 2005 static int copy_to_user_kmaddress(struct xfrm_kmaddress *k, struct sk_buff *skb) 2006 { 2007 struct xfrm_user_kmaddress uk; 2008 2009 memset(&uk, 0, sizeof(uk)); 2010 uk.family = k->family; 2011 uk.reserved = k->reserved; 2012 memcpy(&uk.local, &k->local, sizeof(uk.local)); 2013 memcpy(&uk.remote, &k->remote, sizeof(uk.remote)); 2014 2015 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk); 2016 } 2017 2018 static inline size_t xfrm_migrate_msgsize(int num_migrate, int with_kma) 2019 { 2020 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id)) 2021 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0) 2022 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate) 2023 + userpolicy_type_attrsize(); 2024 } 2025 2026 static int build_migrate(struct sk_buff *skb, struct xfrm_migrate *m, 2027 int num_migrate, struct xfrm_kmaddress *k, 2028 struct xfrm_selector *sel, u8 dir, u8 type) 2029 { 2030 struct xfrm_migrate *mp; 2031 struct xfrm_userpolicy_id *pol_id; 2032 struct nlmsghdr *nlh; 2033 int i; 2034 2035 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0); 2036 if (nlh == NULL) 2037 return -EMSGSIZE; 2038 2039 pol_id = nlmsg_data(nlh); 2040 /* copy data from selector, dir, and type to the pol_id */ 2041 memset(pol_id, 0, sizeof(*pol_id)); 2042 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel)); 2043 pol_id->dir = dir; 2044 2045 if (k != NULL && (copy_to_user_kmaddress(k, skb) < 0)) 2046 goto nlmsg_failure; 2047 2048 if (copy_to_user_policy_type(type, skb) < 0) 2049 goto nlmsg_failure; 2050 2051 for (i = 0, mp = m ; i < num_migrate; i++, mp++) { 2052 if (copy_to_user_migrate(mp, skb) < 0) 2053 goto nlmsg_failure; 2054 } 2055 2056 return nlmsg_end(skb, nlh); 2057 nlmsg_failure: 2058 nlmsg_cancel(skb, nlh); 2059 return -EMSGSIZE; 2060 } 2061 2062 static int xfrm_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type, 2063 struct xfrm_migrate *m, int num_migrate, 2064 struct xfrm_kmaddress *k) 2065 { 2066 struct net *net = &init_net; 2067 struct sk_buff *skb; 2068 2069 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k), GFP_ATOMIC); 2070 if (skb == NULL) 2071 return -ENOMEM; 2072 2073 /* build migrate */ 2074 if (build_migrate(skb, m, num_migrate, k, sel, dir, type) < 0) 2075 BUG(); 2076 2077 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MIGRATE, GFP_ATOMIC); 2078 } 2079 #else 2080 static int xfrm_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type, 2081 struct xfrm_migrate *m, int num_migrate, 2082 struct xfrm_kmaddress *k) 2083 { 2084 return -ENOPROTOOPT; 2085 } 2086 #endif 2087 2088 #define XMSGSIZE(type) sizeof(struct type) 2089 2090 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = { 2091 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), 2092 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), 2093 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), 2094 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), 2095 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 2096 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 2097 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info), 2098 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire), 2099 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire), 2100 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), 2101 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), 2102 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire), 2103 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush), 2104 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0, 2105 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), 2106 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), 2107 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report), 2108 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 2109 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32), 2110 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32), 2111 }; 2112 2113 #undef XMSGSIZE 2114 2115 static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = { 2116 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)}, 2117 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)}, 2118 [XFRMA_LASTUSED] = { .type = NLA_U64}, 2119 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)}, 2120 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) }, 2121 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) }, 2122 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) }, 2123 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) }, 2124 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) }, 2125 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) }, 2126 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) }, 2127 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) }, 2128 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) }, 2129 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 }, 2130 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 }, 2131 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) }, 2132 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) }, 2133 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)}, 2134 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) }, 2135 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) }, 2136 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) }, 2137 [XFRMA_TFCPAD] = { .type = NLA_U32 }, 2138 }; 2139 2140 static struct xfrm_link { 2141 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **); 2142 int (*dump)(struct sk_buff *, struct netlink_callback *); 2143 int (*done)(struct netlink_callback *); 2144 } xfrm_dispatch[XFRM_NR_MSGTYPES] = { 2145 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, 2146 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa }, 2147 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa, 2148 .dump = xfrm_dump_sa, 2149 .done = xfrm_dump_sa_done }, 2150 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, 2151 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy }, 2152 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy, 2153 .dump = xfrm_dump_policy, 2154 .done = xfrm_dump_policy_done }, 2155 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi }, 2156 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire }, 2157 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire }, 2158 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, 2159 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, 2160 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire}, 2161 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa }, 2162 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy }, 2163 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae }, 2164 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae }, 2165 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate }, 2166 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo }, 2167 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo }, 2168 }; 2169 2170 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 2171 { 2172 struct net *net = sock_net(skb->sk); 2173 struct nlattr *attrs[XFRMA_MAX+1]; 2174 struct xfrm_link *link; 2175 int type, err; 2176 2177 type = nlh->nlmsg_type; 2178 if (type > XFRM_MSG_MAX) 2179 return -EINVAL; 2180 2181 type -= XFRM_MSG_BASE; 2182 link = &xfrm_dispatch[type]; 2183 2184 /* All operations require privileges, even GET */ 2185 if (security_netlink_recv(skb, CAP_NET_ADMIN)) 2186 return -EPERM; 2187 2188 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) || 2189 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) && 2190 (nlh->nlmsg_flags & NLM_F_DUMP) == NLM_F_DUMP) { 2191 if (link->dump == NULL) 2192 return -EINVAL; 2193 2194 return netlink_dump_start(net->xfrm.nlsk, skb, nlh, link->dump, link->done); 2195 } 2196 2197 err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs, XFRMA_MAX, 2198 xfrma_policy); 2199 if (err < 0) 2200 return err; 2201 2202 if (link->doit == NULL) 2203 return -EINVAL; 2204 2205 return link->doit(skb, nlh, attrs); 2206 } 2207 2208 static void xfrm_netlink_rcv(struct sk_buff *skb) 2209 { 2210 mutex_lock(&xfrm_cfg_mutex); 2211 netlink_rcv_skb(skb, &xfrm_user_rcv_msg); 2212 mutex_unlock(&xfrm_cfg_mutex); 2213 } 2214 2215 static inline size_t xfrm_expire_msgsize(void) 2216 { 2217 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire)) 2218 + nla_total_size(sizeof(struct xfrm_mark)); 2219 } 2220 2221 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c) 2222 { 2223 struct xfrm_user_expire *ue; 2224 struct nlmsghdr *nlh; 2225 2226 nlh = nlmsg_put(skb, c->pid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0); 2227 if (nlh == NULL) 2228 return -EMSGSIZE; 2229 2230 ue = nlmsg_data(nlh); 2231 copy_to_user_state(x, &ue->state); 2232 ue->hard = (c->data.hard != 0) ? 1 : 0; 2233 2234 if (xfrm_mark_put(skb, &x->mark)) 2235 goto nla_put_failure; 2236 2237 return nlmsg_end(skb, nlh); 2238 2239 nla_put_failure: 2240 return -EMSGSIZE; 2241 } 2242 2243 static int xfrm_exp_state_notify(struct xfrm_state *x, struct km_event *c) 2244 { 2245 struct net *net = xs_net(x); 2246 struct sk_buff *skb; 2247 2248 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC); 2249 if (skb == NULL) 2250 return -ENOMEM; 2251 2252 if (build_expire(skb, x, c) < 0) { 2253 kfree_skb(skb); 2254 return -EMSGSIZE; 2255 } 2256 2257 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC); 2258 } 2259 2260 static int xfrm_aevent_state_notify(struct xfrm_state *x, struct km_event *c) 2261 { 2262 struct net *net = xs_net(x); 2263 struct sk_buff *skb; 2264 2265 skb = nlmsg_new(xfrm_aevent_msgsize(), GFP_ATOMIC); 2266 if (skb == NULL) 2267 return -ENOMEM; 2268 2269 if (build_aevent(skb, x, c) < 0) 2270 BUG(); 2271 2272 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_AEVENTS, GFP_ATOMIC); 2273 } 2274 2275 static int xfrm_notify_sa_flush(struct km_event *c) 2276 { 2277 struct net *net = c->net; 2278 struct xfrm_usersa_flush *p; 2279 struct nlmsghdr *nlh; 2280 struct sk_buff *skb; 2281 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush)); 2282 2283 skb = nlmsg_new(len, GFP_ATOMIC); 2284 if (skb == NULL) 2285 return -ENOMEM; 2286 2287 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0); 2288 if (nlh == NULL) { 2289 kfree_skb(skb); 2290 return -EMSGSIZE; 2291 } 2292 2293 p = nlmsg_data(nlh); 2294 p->proto = c->data.proto; 2295 2296 nlmsg_end(skb, nlh); 2297 2298 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC); 2299 } 2300 2301 static inline size_t xfrm_sa_len(struct xfrm_state *x) 2302 { 2303 size_t l = 0; 2304 if (x->aead) 2305 l += nla_total_size(aead_len(x->aead)); 2306 if (x->aalg) { 2307 l += nla_total_size(sizeof(struct xfrm_algo) + 2308 (x->aalg->alg_key_len + 7) / 8); 2309 l += nla_total_size(xfrm_alg_auth_len(x->aalg)); 2310 } 2311 if (x->ealg) 2312 l += nla_total_size(xfrm_alg_len(x->ealg)); 2313 if (x->calg) 2314 l += nla_total_size(sizeof(*x->calg)); 2315 if (x->encap) 2316 l += nla_total_size(sizeof(*x->encap)); 2317 if (x->tfcpad) 2318 l += nla_total_size(sizeof(x->tfcpad)); 2319 if (x->security) 2320 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) + 2321 x->security->ctx_len); 2322 if (x->coaddr) 2323 l += nla_total_size(sizeof(*x->coaddr)); 2324 2325 /* Must count x->lastused as it may become non-zero behind our back. */ 2326 l += nla_total_size(sizeof(u64)); 2327 2328 return l; 2329 } 2330 2331 static int xfrm_notify_sa(struct xfrm_state *x, struct km_event *c) 2332 { 2333 struct net *net = xs_net(x); 2334 struct xfrm_usersa_info *p; 2335 struct xfrm_usersa_id *id; 2336 struct nlmsghdr *nlh; 2337 struct sk_buff *skb; 2338 int len = xfrm_sa_len(x); 2339 int headlen; 2340 2341 headlen = sizeof(*p); 2342 if (c->event == XFRM_MSG_DELSA) { 2343 len += nla_total_size(headlen); 2344 headlen = sizeof(*id); 2345 len += nla_total_size(sizeof(struct xfrm_mark)); 2346 } 2347 len += NLMSG_ALIGN(headlen); 2348 2349 skb = nlmsg_new(len, GFP_ATOMIC); 2350 if (skb == NULL) 2351 return -ENOMEM; 2352 2353 nlh = nlmsg_put(skb, c->pid, c->seq, c->event, headlen, 0); 2354 if (nlh == NULL) 2355 goto nla_put_failure; 2356 2357 p = nlmsg_data(nlh); 2358 if (c->event == XFRM_MSG_DELSA) { 2359 struct nlattr *attr; 2360 2361 id = nlmsg_data(nlh); 2362 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr)); 2363 id->spi = x->id.spi; 2364 id->family = x->props.family; 2365 id->proto = x->id.proto; 2366 2367 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p)); 2368 if (attr == NULL) 2369 goto nla_put_failure; 2370 2371 p = nla_data(attr); 2372 } 2373 2374 if (copy_to_user_state_extra(x, p, skb)) 2375 goto nla_put_failure; 2376 2377 nlmsg_end(skb, nlh); 2378 2379 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC); 2380 2381 nla_put_failure: 2382 /* Somebody screwed up with xfrm_sa_len! */ 2383 WARN_ON(1); 2384 kfree_skb(skb); 2385 return -1; 2386 } 2387 2388 static int xfrm_send_state_notify(struct xfrm_state *x, struct km_event *c) 2389 { 2390 2391 switch (c->event) { 2392 case XFRM_MSG_EXPIRE: 2393 return xfrm_exp_state_notify(x, c); 2394 case XFRM_MSG_NEWAE: 2395 return xfrm_aevent_state_notify(x, c); 2396 case XFRM_MSG_DELSA: 2397 case XFRM_MSG_UPDSA: 2398 case XFRM_MSG_NEWSA: 2399 return xfrm_notify_sa(x, c); 2400 case XFRM_MSG_FLUSHSA: 2401 return xfrm_notify_sa_flush(c); 2402 default: 2403 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n", 2404 c->event); 2405 break; 2406 } 2407 2408 return 0; 2409 2410 } 2411 2412 static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x, 2413 struct xfrm_policy *xp) 2414 { 2415 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire)) 2416 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr) 2417 + nla_total_size(sizeof(struct xfrm_mark)) 2418 + nla_total_size(xfrm_user_sec_ctx_size(x->security)) 2419 + userpolicy_type_attrsize(); 2420 } 2421 2422 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x, 2423 struct xfrm_tmpl *xt, struct xfrm_policy *xp, 2424 int dir) 2425 { 2426 struct xfrm_user_acquire *ua; 2427 struct nlmsghdr *nlh; 2428 __u32 seq = xfrm_get_acqseq(); 2429 2430 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0); 2431 if (nlh == NULL) 2432 return -EMSGSIZE; 2433 2434 ua = nlmsg_data(nlh); 2435 memcpy(&ua->id, &x->id, sizeof(ua->id)); 2436 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr)); 2437 memcpy(&ua->sel, &x->sel, sizeof(ua->sel)); 2438 copy_to_user_policy(xp, &ua->policy, dir); 2439 ua->aalgos = xt->aalgos; 2440 ua->ealgos = xt->ealgos; 2441 ua->calgos = xt->calgos; 2442 ua->seq = x->km.seq = seq; 2443 2444 if (copy_to_user_tmpl(xp, skb) < 0) 2445 goto nlmsg_failure; 2446 if (copy_to_user_state_sec_ctx(x, skb)) 2447 goto nlmsg_failure; 2448 if (copy_to_user_policy_type(xp->type, skb) < 0) 2449 goto nlmsg_failure; 2450 if (xfrm_mark_put(skb, &xp->mark)) 2451 goto nla_put_failure; 2452 2453 return nlmsg_end(skb, nlh); 2454 2455 nla_put_failure: 2456 nlmsg_failure: 2457 nlmsg_cancel(skb, nlh); 2458 return -EMSGSIZE; 2459 } 2460 2461 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt, 2462 struct xfrm_policy *xp, int dir) 2463 { 2464 struct net *net = xs_net(x); 2465 struct sk_buff *skb; 2466 2467 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC); 2468 if (skb == NULL) 2469 return -ENOMEM; 2470 2471 if (build_acquire(skb, x, xt, xp, dir) < 0) 2472 BUG(); 2473 2474 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_ACQUIRE, GFP_ATOMIC); 2475 } 2476 2477 /* User gives us xfrm_user_policy_info followed by an array of 0 2478 * or more templates. 2479 */ 2480 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt, 2481 u8 *data, int len, int *dir) 2482 { 2483 struct net *net = sock_net(sk); 2484 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data; 2485 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1); 2486 struct xfrm_policy *xp; 2487 int nr; 2488 2489 switch (sk->sk_family) { 2490 case AF_INET: 2491 if (opt != IP_XFRM_POLICY) { 2492 *dir = -EOPNOTSUPP; 2493 return NULL; 2494 } 2495 break; 2496 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 2497 case AF_INET6: 2498 if (opt != IPV6_XFRM_POLICY) { 2499 *dir = -EOPNOTSUPP; 2500 return NULL; 2501 } 2502 break; 2503 #endif 2504 default: 2505 *dir = -EINVAL; 2506 return NULL; 2507 } 2508 2509 *dir = -EINVAL; 2510 2511 if (len < sizeof(*p) || 2512 verify_newpolicy_info(p)) 2513 return NULL; 2514 2515 nr = ((len - sizeof(*p)) / sizeof(*ut)); 2516 if (validate_tmpl(nr, ut, p->sel.family)) 2517 return NULL; 2518 2519 if (p->dir > XFRM_POLICY_OUT) 2520 return NULL; 2521 2522 xp = xfrm_policy_alloc(net, GFP_ATOMIC); 2523 if (xp == NULL) { 2524 *dir = -ENOBUFS; 2525 return NULL; 2526 } 2527 2528 copy_from_user_policy(xp, p); 2529 xp->type = XFRM_POLICY_TYPE_MAIN; 2530 copy_templates(xp, ut, nr); 2531 2532 *dir = p->dir; 2533 2534 return xp; 2535 } 2536 2537 static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp) 2538 { 2539 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire)) 2540 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr) 2541 + nla_total_size(xfrm_user_sec_ctx_size(xp->security)) 2542 + nla_total_size(sizeof(struct xfrm_mark)) 2543 + userpolicy_type_attrsize(); 2544 } 2545 2546 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp, 2547 int dir, struct km_event *c) 2548 { 2549 struct xfrm_user_polexpire *upe; 2550 struct nlmsghdr *nlh; 2551 int hard = c->data.hard; 2552 2553 nlh = nlmsg_put(skb, c->pid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0); 2554 if (nlh == NULL) 2555 return -EMSGSIZE; 2556 2557 upe = nlmsg_data(nlh); 2558 copy_to_user_policy(xp, &upe->pol, dir); 2559 if (copy_to_user_tmpl(xp, skb) < 0) 2560 goto nlmsg_failure; 2561 if (copy_to_user_sec_ctx(xp, skb)) 2562 goto nlmsg_failure; 2563 if (copy_to_user_policy_type(xp->type, skb) < 0) 2564 goto nlmsg_failure; 2565 if (xfrm_mark_put(skb, &xp->mark)) 2566 goto nla_put_failure; 2567 upe->hard = !!hard; 2568 2569 return nlmsg_end(skb, nlh); 2570 2571 nla_put_failure: 2572 nlmsg_failure: 2573 nlmsg_cancel(skb, nlh); 2574 return -EMSGSIZE; 2575 } 2576 2577 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c) 2578 { 2579 struct net *net = xp_net(xp); 2580 struct sk_buff *skb; 2581 2582 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC); 2583 if (skb == NULL) 2584 return -ENOMEM; 2585 2586 if (build_polexpire(skb, xp, dir, c) < 0) 2587 BUG(); 2588 2589 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC); 2590 } 2591 2592 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c) 2593 { 2594 struct net *net = xp_net(xp); 2595 struct xfrm_userpolicy_info *p; 2596 struct xfrm_userpolicy_id *id; 2597 struct nlmsghdr *nlh; 2598 struct sk_buff *skb; 2599 int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr); 2600 int headlen; 2601 2602 headlen = sizeof(*p); 2603 if (c->event == XFRM_MSG_DELPOLICY) { 2604 len += nla_total_size(headlen); 2605 headlen = sizeof(*id); 2606 } 2607 len += userpolicy_type_attrsize(); 2608 len += nla_total_size(sizeof(struct xfrm_mark)); 2609 len += NLMSG_ALIGN(headlen); 2610 2611 skb = nlmsg_new(len, GFP_ATOMIC); 2612 if (skb == NULL) 2613 return -ENOMEM; 2614 2615 nlh = nlmsg_put(skb, c->pid, c->seq, c->event, headlen, 0); 2616 if (nlh == NULL) 2617 goto nlmsg_failure; 2618 2619 p = nlmsg_data(nlh); 2620 if (c->event == XFRM_MSG_DELPOLICY) { 2621 struct nlattr *attr; 2622 2623 id = nlmsg_data(nlh); 2624 memset(id, 0, sizeof(*id)); 2625 id->dir = dir; 2626 if (c->data.byid) 2627 id->index = xp->index; 2628 else 2629 memcpy(&id->sel, &xp->selector, sizeof(id->sel)); 2630 2631 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p)); 2632 if (attr == NULL) 2633 goto nlmsg_failure; 2634 2635 p = nla_data(attr); 2636 } 2637 2638 copy_to_user_policy(xp, p, dir); 2639 if (copy_to_user_tmpl(xp, skb) < 0) 2640 goto nlmsg_failure; 2641 if (copy_to_user_policy_type(xp->type, skb) < 0) 2642 goto nlmsg_failure; 2643 2644 if (xfrm_mark_put(skb, &xp->mark)) 2645 goto nla_put_failure; 2646 2647 nlmsg_end(skb, nlh); 2648 2649 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC); 2650 2651 nla_put_failure: 2652 nlmsg_failure: 2653 kfree_skb(skb); 2654 return -1; 2655 } 2656 2657 static int xfrm_notify_policy_flush(struct km_event *c) 2658 { 2659 struct net *net = c->net; 2660 struct nlmsghdr *nlh; 2661 struct sk_buff *skb; 2662 2663 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC); 2664 if (skb == NULL) 2665 return -ENOMEM; 2666 2667 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0); 2668 if (nlh == NULL) 2669 goto nlmsg_failure; 2670 if (copy_to_user_policy_type(c->data.type, skb) < 0) 2671 goto nlmsg_failure; 2672 2673 nlmsg_end(skb, nlh); 2674 2675 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC); 2676 2677 nlmsg_failure: 2678 kfree_skb(skb); 2679 return -1; 2680 } 2681 2682 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c) 2683 { 2684 2685 switch (c->event) { 2686 case XFRM_MSG_NEWPOLICY: 2687 case XFRM_MSG_UPDPOLICY: 2688 case XFRM_MSG_DELPOLICY: 2689 return xfrm_notify_policy(xp, dir, c); 2690 case XFRM_MSG_FLUSHPOLICY: 2691 return xfrm_notify_policy_flush(c); 2692 case XFRM_MSG_POLEXPIRE: 2693 return xfrm_exp_policy_notify(xp, dir, c); 2694 default: 2695 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n", 2696 c->event); 2697 } 2698 2699 return 0; 2700 2701 } 2702 2703 static inline size_t xfrm_report_msgsize(void) 2704 { 2705 return NLMSG_ALIGN(sizeof(struct xfrm_user_report)); 2706 } 2707 2708 static int build_report(struct sk_buff *skb, u8 proto, 2709 struct xfrm_selector *sel, xfrm_address_t *addr) 2710 { 2711 struct xfrm_user_report *ur; 2712 struct nlmsghdr *nlh; 2713 2714 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0); 2715 if (nlh == NULL) 2716 return -EMSGSIZE; 2717 2718 ur = nlmsg_data(nlh); 2719 ur->proto = proto; 2720 memcpy(&ur->sel, sel, sizeof(ur->sel)); 2721 2722 if (addr) 2723 NLA_PUT(skb, XFRMA_COADDR, sizeof(*addr), addr); 2724 2725 return nlmsg_end(skb, nlh); 2726 2727 nla_put_failure: 2728 nlmsg_cancel(skb, nlh); 2729 return -EMSGSIZE; 2730 } 2731 2732 static int xfrm_send_report(struct net *net, u8 proto, 2733 struct xfrm_selector *sel, xfrm_address_t *addr) 2734 { 2735 struct sk_buff *skb; 2736 2737 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC); 2738 if (skb == NULL) 2739 return -ENOMEM; 2740 2741 if (build_report(skb, proto, sel, addr) < 0) 2742 BUG(); 2743 2744 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_REPORT, GFP_ATOMIC); 2745 } 2746 2747 static inline size_t xfrm_mapping_msgsize(void) 2748 { 2749 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping)); 2750 } 2751 2752 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x, 2753 xfrm_address_t *new_saddr, __be16 new_sport) 2754 { 2755 struct xfrm_user_mapping *um; 2756 struct nlmsghdr *nlh; 2757 2758 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0); 2759 if (nlh == NULL) 2760 return -EMSGSIZE; 2761 2762 um = nlmsg_data(nlh); 2763 2764 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr)); 2765 um->id.spi = x->id.spi; 2766 um->id.family = x->props.family; 2767 um->id.proto = x->id.proto; 2768 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr)); 2769 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr)); 2770 um->new_sport = new_sport; 2771 um->old_sport = x->encap->encap_sport; 2772 um->reqid = x->props.reqid; 2773 2774 return nlmsg_end(skb, nlh); 2775 } 2776 2777 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, 2778 __be16 sport) 2779 { 2780 struct net *net = xs_net(x); 2781 struct sk_buff *skb; 2782 2783 if (x->id.proto != IPPROTO_ESP) 2784 return -EINVAL; 2785 2786 if (!x->encap) 2787 return -EINVAL; 2788 2789 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC); 2790 if (skb == NULL) 2791 return -ENOMEM; 2792 2793 if (build_mapping(skb, x, ipaddr, sport) < 0) 2794 BUG(); 2795 2796 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MAPPING, GFP_ATOMIC); 2797 } 2798 2799 static struct xfrm_mgr netlink_mgr = { 2800 .id = "netlink", 2801 .notify = xfrm_send_state_notify, 2802 .acquire = xfrm_send_acquire, 2803 .compile_policy = xfrm_compile_policy, 2804 .notify_policy = xfrm_send_policy_notify, 2805 .report = xfrm_send_report, 2806 .migrate = xfrm_send_migrate, 2807 .new_mapping = xfrm_send_mapping, 2808 }; 2809 2810 static int __net_init xfrm_user_net_init(struct net *net) 2811 { 2812 struct sock *nlsk; 2813 2814 nlsk = netlink_kernel_create(net, NETLINK_XFRM, XFRMNLGRP_MAX, 2815 xfrm_netlink_rcv, NULL, THIS_MODULE); 2816 if (nlsk == NULL) 2817 return -ENOMEM; 2818 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */ 2819 rcu_assign_pointer(net->xfrm.nlsk, nlsk); 2820 return 0; 2821 } 2822 2823 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list) 2824 { 2825 struct net *net; 2826 list_for_each_entry(net, net_exit_list, exit_list) 2827 rcu_assign_pointer(net->xfrm.nlsk, NULL); 2828 synchronize_net(); 2829 list_for_each_entry(net, net_exit_list, exit_list) 2830 netlink_kernel_release(net->xfrm.nlsk_stash); 2831 } 2832 2833 static struct pernet_operations xfrm_user_net_ops = { 2834 .init = xfrm_user_net_init, 2835 .exit_batch = xfrm_user_net_exit, 2836 }; 2837 2838 static int __init xfrm_user_init(void) 2839 { 2840 int rv; 2841 2842 printk(KERN_INFO "Initializing XFRM netlink socket\n"); 2843 2844 rv = register_pernet_subsys(&xfrm_user_net_ops); 2845 if (rv < 0) 2846 return rv; 2847 rv = xfrm_register_km(&netlink_mgr); 2848 if (rv < 0) 2849 unregister_pernet_subsys(&xfrm_user_net_ops); 2850 return rv; 2851 } 2852 2853 static void __exit xfrm_user_exit(void) 2854 { 2855 xfrm_unregister_km(&netlink_mgr); 2856 unregister_pernet_subsys(&xfrm_user_net_ops); 2857 } 2858 2859 module_init(xfrm_user_init); 2860 module_exit(xfrm_user_exit); 2861 MODULE_LICENSE("GPL"); 2862 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM); 2863 2864