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