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