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