| 1 | /* xfrm_user.c: User interface to configure xfrm engine. |
| 2 | * |
| 3 | * Copyright (C) 2002 David S. Miller (davem@redhat.com) |
| 4 | * |
| 5 | * Changes: |
| 6 | * Mitsuru KANDA @USAGI |
| 7 | * Kazunori MIYAZAWA @USAGI |
| 8 | * Kunihiro Ishiguro <kunihiro@ipinfusion.com> |
| 9 | * IPv6 support |
| 10 | * |
| 11 | */ |
| 12 | |
| 13 | #include <linux/crypto.h> |
| 14 | #include <linux/module.h> |
| 15 | #include <linux/kernel.h> |
| 16 | #include <linux/types.h> |
| 17 | #include <linux/slab.h> |
| 18 | #include <linux/socket.h> |
| 19 | #include <linux/string.h> |
| 20 | #include <linux/net.h> |
| 21 | #include <linux/skbuff.h> |
| 22 | #include <linux/pfkeyv2.h> |
| 23 | #include <linux/ipsec.h> |
| 24 | #include <linux/init.h> |
| 25 | #include <linux/security.h> |
| 26 | #include <net/sock.h> |
| 27 | #include <net/xfrm.h> |
| 28 | #include <net/netlink.h> |
| 29 | #include <net/ah.h> |
| 30 | #include <asm/uaccess.h> |
| 31 | #if IS_ENABLED(CONFIG_IPV6) |
| 32 | #include <linux/in6.h> |
| 33 | #endif |
| 34 | |
| 35 | static inline int aead_len(struct xfrm_algo_aead *alg) |
| 36 | { |
| 37 | return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); |
| 38 | } |
| 39 | |
| 40 | static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type) |
| 41 | { |
| 42 | struct nlattr *rt = attrs[type]; |
| 43 | struct xfrm_algo *algp; |
| 44 | |
| 45 | if (!rt) |
| 46 | return 0; |
| 47 | |
| 48 | algp = nla_data(rt); |
| 49 | if (nla_len(rt) < xfrm_alg_len(algp)) |
| 50 | return -EINVAL; |
| 51 | |
| 52 | switch (type) { |
| 53 | case XFRMA_ALG_AUTH: |
| 54 | case XFRMA_ALG_CRYPT: |
| 55 | case XFRMA_ALG_COMP: |
| 56 | break; |
| 57 | |
| 58 | default: |
| 59 | return -EINVAL; |
| 60 | } |
| 61 | |
| 62 | algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0'; |
| 63 | return 0; |
| 64 | } |
| 65 | |
| 66 | static int verify_auth_trunc(struct nlattr **attrs) |
| 67 | { |
| 68 | struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC]; |
| 69 | struct xfrm_algo_auth *algp; |
| 70 | |
| 71 | if (!rt) |
| 72 | return 0; |
| 73 | |
| 74 | algp = nla_data(rt); |
| 75 | if (nla_len(rt) < xfrm_alg_auth_len(algp)) |
| 76 | return -EINVAL; |
| 77 | |
| 78 | algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0'; |
| 79 | return 0; |
| 80 | } |
| 81 | |
| 82 | static int verify_aead(struct nlattr **attrs) |
| 83 | { |
| 84 | struct nlattr *rt = attrs[XFRMA_ALG_AEAD]; |
| 85 | struct xfrm_algo_aead *algp; |
| 86 | |
| 87 | if (!rt) |
| 88 | return 0; |
| 89 | |
| 90 | algp = nla_data(rt); |
| 91 | if (nla_len(rt) < aead_len(algp)) |
| 92 | return -EINVAL; |
| 93 | |
| 94 | algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0'; |
| 95 | return 0; |
| 96 | } |
| 97 | |
| 98 | static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type, |
| 99 | xfrm_address_t **addrp) |
| 100 | { |
| 101 | struct nlattr *rt = attrs[type]; |
| 102 | |
| 103 | if (rt && addrp) |
| 104 | *addrp = nla_data(rt); |
| 105 | } |
| 106 | |
| 107 | static inline int verify_sec_ctx_len(struct nlattr **attrs) |
| 108 | { |
| 109 | struct nlattr *rt = attrs[XFRMA_SEC_CTX]; |
| 110 | struct xfrm_user_sec_ctx *uctx; |
| 111 | |
| 112 | if (!rt) |
| 113 | return 0; |
| 114 | |
| 115 | uctx = nla_data(rt); |
| 116 | if (uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len)) |
| 117 | return -EINVAL; |
| 118 | |
| 119 | return 0; |
| 120 | } |
| 121 | |
| 122 | static inline int verify_replay(struct xfrm_usersa_info *p, |
| 123 | struct nlattr **attrs) |
| 124 | { |
| 125 | struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL]; |
| 126 | |
| 127 | if ((p->flags & XFRM_STATE_ESN) && !rt) |
| 128 | return -EINVAL; |
| 129 | |
| 130 | if (!rt) |
| 131 | return 0; |
| 132 | |
| 133 | if (p->id.proto != IPPROTO_ESP) |
| 134 | return -EINVAL; |
| 135 | |
| 136 | if (p->replay_window != 0) |
| 137 | return -EINVAL; |
| 138 | |
| 139 | return 0; |
| 140 | } |
| 141 | |
| 142 | static int verify_newsa_info(struct xfrm_usersa_info *p, |
| 143 | struct nlattr **attrs) |
| 144 | { |
| 145 | int err; |
| 146 | |
| 147 | err = -EINVAL; |
| 148 | switch (p->family) { |
| 149 | case AF_INET: |
| 150 | break; |
| 151 | |
| 152 | case AF_INET6: |
| 153 | #if IS_ENABLED(CONFIG_IPV6) |
| 154 | break; |
| 155 | #else |
| 156 | err = -EAFNOSUPPORT; |
| 157 | goto out; |
| 158 | #endif |
| 159 | |
| 160 | default: |
| 161 | goto out; |
| 162 | } |
| 163 | |
| 164 | err = -EINVAL; |
| 165 | switch (p->id.proto) { |
| 166 | case IPPROTO_AH: |
| 167 | if ((!attrs[XFRMA_ALG_AUTH] && |
| 168 | !attrs[XFRMA_ALG_AUTH_TRUNC]) || |
| 169 | attrs[XFRMA_ALG_AEAD] || |
| 170 | attrs[XFRMA_ALG_CRYPT] || |
| 171 | attrs[XFRMA_ALG_COMP] || |
| 172 | attrs[XFRMA_TFCPAD]) |
| 173 | goto out; |
| 174 | break; |
| 175 | |
| 176 | case IPPROTO_ESP: |
| 177 | if (attrs[XFRMA_ALG_COMP]) |
| 178 | goto out; |
| 179 | if (!attrs[XFRMA_ALG_AUTH] && |
| 180 | !attrs[XFRMA_ALG_AUTH_TRUNC] && |
| 181 | !attrs[XFRMA_ALG_CRYPT] && |
| 182 | !attrs[XFRMA_ALG_AEAD]) |
| 183 | goto out; |
| 184 | if ((attrs[XFRMA_ALG_AUTH] || |
| 185 | attrs[XFRMA_ALG_AUTH_TRUNC] || |
| 186 | attrs[XFRMA_ALG_CRYPT]) && |
| 187 | attrs[XFRMA_ALG_AEAD]) |
| 188 | goto out; |
| 189 | if (attrs[XFRMA_TFCPAD] && |
| 190 | p->mode != XFRM_MODE_TUNNEL) |
| 191 | goto out; |
| 192 | break; |
| 193 | |
| 194 | case IPPROTO_COMP: |
| 195 | if (!attrs[XFRMA_ALG_COMP] || |
| 196 | attrs[XFRMA_ALG_AEAD] || |
| 197 | attrs[XFRMA_ALG_AUTH] || |
| 198 | attrs[XFRMA_ALG_AUTH_TRUNC] || |
| 199 | attrs[XFRMA_ALG_CRYPT] || |
| 200 | attrs[XFRMA_TFCPAD]) |
| 201 | goto out; |
| 202 | break; |
| 203 | |
| 204 | #if IS_ENABLED(CONFIG_IPV6) |
| 205 | case IPPROTO_DSTOPTS: |
| 206 | case IPPROTO_ROUTING: |
| 207 | if (attrs[XFRMA_ALG_COMP] || |
| 208 | attrs[XFRMA_ALG_AUTH] || |
| 209 | attrs[XFRMA_ALG_AUTH_TRUNC] || |
| 210 | attrs[XFRMA_ALG_AEAD] || |
| 211 | attrs[XFRMA_ALG_CRYPT] || |
| 212 | attrs[XFRMA_ENCAP] || |
| 213 | attrs[XFRMA_SEC_CTX] || |
| 214 | attrs[XFRMA_TFCPAD] || |
| 215 | !attrs[XFRMA_COADDR]) |
| 216 | goto out; |
| 217 | break; |
| 218 | #endif |
| 219 | |
| 220 | default: |
| 221 | goto out; |
| 222 | } |
| 223 | |
| 224 | if ((err = verify_aead(attrs))) |
| 225 | goto out; |
| 226 | if ((err = verify_auth_trunc(attrs))) |
| 227 | goto out; |
| 228 | if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH))) |
| 229 | goto out; |
| 230 | if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT))) |
| 231 | goto out; |
| 232 | if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP))) |
| 233 | goto out; |
| 234 | if ((err = verify_sec_ctx_len(attrs))) |
| 235 | goto out; |
| 236 | if ((err = verify_replay(p, attrs))) |
| 237 | goto out; |
| 238 | |
| 239 | err = -EINVAL; |
| 240 | switch (p->mode) { |
| 241 | case XFRM_MODE_TRANSPORT: |
| 242 | case XFRM_MODE_TUNNEL: |
| 243 | case XFRM_MODE_ROUTEOPTIMIZATION: |
| 244 | case XFRM_MODE_BEET: |
| 245 | break; |
| 246 | |
| 247 | default: |
| 248 | goto out; |
| 249 | } |
| 250 | |
| 251 | err = 0; |
| 252 | |
| 253 | out: |
| 254 | return err; |
| 255 | } |
| 256 | |
| 257 | static int attach_one_algo(struct xfrm_algo **algpp, u8 *props, |
| 258 | struct xfrm_algo_desc *(*get_byname)(const char *, int), |
| 259 | struct nlattr *rta) |
| 260 | { |
| 261 | struct xfrm_algo *p, *ualg; |
| 262 | struct xfrm_algo_desc *algo; |
| 263 | |
| 264 | if (!rta) |
| 265 | return 0; |
| 266 | |
| 267 | ualg = nla_data(rta); |
| 268 | |
| 269 | algo = get_byname(ualg->alg_name, 1); |
| 270 | if (!algo) |
| 271 | return -ENOSYS; |
| 272 | *props = algo->desc.sadb_alg_id; |
| 273 | |
| 274 | p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL); |
| 275 | if (!p) |
| 276 | return -ENOMEM; |
| 277 | |
| 278 | strcpy(p->alg_name, algo->name); |
| 279 | *algpp = p; |
| 280 | return 0; |
| 281 | } |
| 282 | |
| 283 | static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props, |
| 284 | struct nlattr *rta) |
| 285 | { |
| 286 | struct xfrm_algo *ualg; |
| 287 | struct xfrm_algo_auth *p; |
| 288 | struct xfrm_algo_desc *algo; |
| 289 | |
| 290 | if (!rta) |
| 291 | return 0; |
| 292 | |
| 293 | ualg = nla_data(rta); |
| 294 | |
| 295 | algo = xfrm_aalg_get_byname(ualg->alg_name, 1); |
| 296 | if (!algo) |
| 297 | return -ENOSYS; |
| 298 | *props = algo->desc.sadb_alg_id; |
| 299 | |
| 300 | p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL); |
| 301 | if (!p) |
| 302 | return -ENOMEM; |
| 303 | |
| 304 | strcpy(p->alg_name, algo->name); |
| 305 | p->alg_key_len = ualg->alg_key_len; |
| 306 | p->alg_trunc_len = algo->uinfo.auth.icv_truncbits; |
| 307 | memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8); |
| 308 | |
| 309 | *algpp = p; |
| 310 | return 0; |
| 311 | } |
| 312 | |
| 313 | static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props, |
| 314 | struct nlattr *rta) |
| 315 | { |
| 316 | struct xfrm_algo_auth *p, *ualg; |
| 317 | struct xfrm_algo_desc *algo; |
| 318 | |
| 319 | if (!rta) |
| 320 | return 0; |
| 321 | |
| 322 | ualg = nla_data(rta); |
| 323 | |
| 324 | algo = xfrm_aalg_get_byname(ualg->alg_name, 1); |
| 325 | if (!algo) |
| 326 | return -ENOSYS; |
| 327 | if ((ualg->alg_trunc_len / 8) > MAX_AH_AUTH_LEN || |
| 328 | ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits) |
| 329 | return -EINVAL; |
| 330 | *props = algo->desc.sadb_alg_id; |
| 331 | |
| 332 | p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL); |
| 333 | if (!p) |
| 334 | return -ENOMEM; |
| 335 | |
| 336 | strcpy(p->alg_name, algo->name); |
| 337 | if (!p->alg_trunc_len) |
| 338 | p->alg_trunc_len = algo->uinfo.auth.icv_truncbits; |
| 339 | |
| 340 | *algpp = p; |
| 341 | return 0; |
| 342 | } |
| 343 | |
| 344 | static int attach_aead(struct xfrm_algo_aead **algpp, u8 *props, |
| 345 | struct nlattr *rta) |
| 346 | { |
| 347 | struct xfrm_algo_aead *p, *ualg; |
| 348 | struct xfrm_algo_desc *algo; |
| 349 | |
| 350 | if (!rta) |
| 351 | return 0; |
| 352 | |
| 353 | ualg = nla_data(rta); |
| 354 | |
| 355 | algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1); |
| 356 | if (!algo) |
| 357 | return -ENOSYS; |
| 358 | *props = algo->desc.sadb_alg_id; |
| 359 | |
| 360 | p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL); |
| 361 | if (!p) |
| 362 | return -ENOMEM; |
| 363 | |
| 364 | strcpy(p->alg_name, algo->name); |
| 365 | *algpp = p; |
| 366 | return 0; |
| 367 | } |
| 368 | |
| 369 | static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn, |
| 370 | struct nlattr *rp) |
| 371 | { |
| 372 | struct xfrm_replay_state_esn *up; |
| 373 | |
| 374 | if (!replay_esn || !rp) |
| 375 | return 0; |
| 376 | |
| 377 | up = nla_data(rp); |
| 378 | |
| 379 | if (xfrm_replay_state_esn_len(replay_esn) != |
| 380 | xfrm_replay_state_esn_len(up)) |
| 381 | return -EINVAL; |
| 382 | |
| 383 | return 0; |
| 384 | } |
| 385 | |
| 386 | static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn, |
| 387 | struct xfrm_replay_state_esn **preplay_esn, |
| 388 | struct nlattr *rta) |
| 389 | { |
| 390 | struct xfrm_replay_state_esn *p, *pp, *up; |
| 391 | |
| 392 | if (!rta) |
| 393 | return 0; |
| 394 | |
| 395 | up = nla_data(rta); |
| 396 | |
| 397 | p = kmemdup(up, xfrm_replay_state_esn_len(up), GFP_KERNEL); |
| 398 | if (!p) |
| 399 | return -ENOMEM; |
| 400 | |
| 401 | pp = kmemdup(up, xfrm_replay_state_esn_len(up), GFP_KERNEL); |
| 402 | if (!pp) { |
| 403 | kfree(p); |
| 404 | return -ENOMEM; |
| 405 | } |
| 406 | |
| 407 | *replay_esn = p; |
| 408 | *preplay_esn = pp; |
| 409 | |
| 410 | return 0; |
| 411 | } |
| 412 | |
| 413 | static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx) |
| 414 | { |
| 415 | int len = 0; |
| 416 | |
| 417 | if (xfrm_ctx) { |
| 418 | len += sizeof(struct xfrm_user_sec_ctx); |
| 419 | len += xfrm_ctx->ctx_len; |
| 420 | } |
| 421 | return len; |
| 422 | } |
| 423 | |
| 424 | static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p) |
| 425 | { |
| 426 | memcpy(&x->id, &p->id, sizeof(x->id)); |
| 427 | memcpy(&x->sel, &p->sel, sizeof(x->sel)); |
| 428 | memcpy(&x->lft, &p->lft, sizeof(x->lft)); |
| 429 | x->props.mode = p->mode; |
| 430 | x->props.replay_window = p->replay_window; |
| 431 | x->props.reqid = p->reqid; |
| 432 | x->props.family = p->family; |
| 433 | memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr)); |
| 434 | x->props.flags = p->flags; |
| 435 | |
| 436 | if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC)) |
| 437 | x->sel.family = p->family; |
| 438 | } |
| 439 | |
| 440 | /* |
| 441 | * someday when pfkey also has support, we could have the code |
| 442 | * somehow made shareable and move it to xfrm_state.c - JHS |
| 443 | * |
| 444 | */ |
| 445 | static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs) |
| 446 | { |
| 447 | struct nlattr *rp = attrs[XFRMA_REPLAY_VAL]; |
| 448 | struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL]; |
| 449 | struct nlattr *lt = attrs[XFRMA_LTIME_VAL]; |
| 450 | struct nlattr *et = attrs[XFRMA_ETIMER_THRESH]; |
| 451 | struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH]; |
| 452 | |
| 453 | if (re) { |
| 454 | struct xfrm_replay_state_esn *replay_esn; |
| 455 | replay_esn = nla_data(re); |
| 456 | memcpy(x->replay_esn, replay_esn, |
| 457 | xfrm_replay_state_esn_len(replay_esn)); |
| 458 | memcpy(x->preplay_esn, replay_esn, |
| 459 | xfrm_replay_state_esn_len(replay_esn)); |
| 460 | } |
| 461 | |
| 462 | if (rp) { |
| 463 | struct xfrm_replay_state *replay; |
| 464 | replay = nla_data(rp); |
| 465 | memcpy(&x->replay, replay, sizeof(*replay)); |
| 466 | memcpy(&x->preplay, replay, sizeof(*replay)); |
| 467 | } |
| 468 | |
| 469 | if (lt) { |
| 470 | struct xfrm_lifetime_cur *ltime; |
| 471 | ltime = nla_data(lt); |
| 472 | x->curlft.bytes = ltime->bytes; |
| 473 | x->curlft.packets = ltime->packets; |
| 474 | x->curlft.add_time = ltime->add_time; |
| 475 | x->curlft.use_time = ltime->use_time; |
| 476 | } |
| 477 | |
| 478 | if (et) |
| 479 | x->replay_maxage = nla_get_u32(et); |
| 480 | |
| 481 | if (rt) |
| 482 | x->replay_maxdiff = nla_get_u32(rt); |
| 483 | } |
| 484 | |
| 485 | static struct xfrm_state *xfrm_state_construct(struct net *net, |
| 486 | struct xfrm_usersa_info *p, |
| 487 | struct nlattr **attrs, |
| 488 | int *errp) |
| 489 | { |
| 490 | struct xfrm_state *x = xfrm_state_alloc(net); |
| 491 | int err = -ENOMEM; |
| 492 | |
| 493 | if (!x) |
| 494 | goto error_no_put; |
| 495 | |
| 496 | copy_from_user_state(x, p); |
| 497 | |
| 498 | if ((err = attach_aead(&x->aead, &x->props.ealgo, |
| 499 | attrs[XFRMA_ALG_AEAD]))) |
| 500 | goto error; |
| 501 | if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo, |
| 502 | attrs[XFRMA_ALG_AUTH_TRUNC]))) |
| 503 | goto error; |
| 504 | if (!x->props.aalgo) { |
| 505 | if ((err = attach_auth(&x->aalg, &x->props.aalgo, |
| 506 | attrs[XFRMA_ALG_AUTH]))) |
| 507 | goto error; |
| 508 | } |
| 509 | if ((err = attach_one_algo(&x->ealg, &x->props.ealgo, |
| 510 | xfrm_ealg_get_byname, |
| 511 | attrs[XFRMA_ALG_CRYPT]))) |
| 512 | goto error; |
| 513 | if ((err = attach_one_algo(&x->calg, &x->props.calgo, |
| 514 | xfrm_calg_get_byname, |
| 515 | attrs[XFRMA_ALG_COMP]))) |
| 516 | goto error; |
| 517 | |
| 518 | if (attrs[XFRMA_ENCAP]) { |
| 519 | x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]), |
| 520 | sizeof(*x->encap), GFP_KERNEL); |
| 521 | if (x->encap == NULL) |
| 522 | goto error; |
| 523 | } |
| 524 | |
| 525 | if (attrs[XFRMA_TFCPAD]) |
| 526 | x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]); |
| 527 | |
| 528 | if (attrs[XFRMA_COADDR]) { |
| 529 | x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]), |
| 530 | sizeof(*x->coaddr), GFP_KERNEL); |
| 531 | if (x->coaddr == NULL) |
| 532 | goto error; |
| 533 | } |
| 534 | |
| 535 | xfrm_mark_get(attrs, &x->mark); |
| 536 | |
| 537 | err = __xfrm_init_state(x, false); |
| 538 | if (err) |
| 539 | goto error; |
| 540 | |
| 541 | if (attrs[XFRMA_SEC_CTX] && |
| 542 | security_xfrm_state_alloc(x, nla_data(attrs[XFRMA_SEC_CTX]))) |
| 543 | goto error; |
| 544 | |
| 545 | if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn, |
| 546 | attrs[XFRMA_REPLAY_ESN_VAL]))) |
| 547 | goto error; |
| 548 | |
| 549 | x->km.seq = p->seq; |
| 550 | x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth; |
| 551 | /* sysctl_xfrm_aevent_etime is in 100ms units */ |
| 552 | x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M; |
| 553 | |
| 554 | if ((err = xfrm_init_replay(x))) |
| 555 | goto error; |
| 556 | |
| 557 | /* override default values from above */ |
| 558 | xfrm_update_ae_params(x, attrs); |
| 559 | |
| 560 | return x; |
| 561 | |
| 562 | error: |
| 563 | x->km.state = XFRM_STATE_DEAD; |
| 564 | xfrm_state_put(x); |
| 565 | error_no_put: |
| 566 | *errp = err; |
| 567 | return NULL; |
| 568 | } |
| 569 | |
| 570 | static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh, |
| 571 | struct nlattr **attrs) |
| 572 | { |
| 573 | struct net *net = sock_net(skb->sk); |
| 574 | struct xfrm_usersa_info *p = nlmsg_data(nlh); |
| 575 | struct xfrm_state *x; |
| 576 | int err; |
| 577 | struct km_event c; |
| 578 | uid_t loginuid = audit_get_loginuid(current); |
| 579 | u32 sessionid = audit_get_sessionid(current); |
| 580 | u32 sid; |
| 581 | |
| 582 | err = verify_newsa_info(p, attrs); |
| 583 | if (err) |
| 584 | return err; |
| 585 | |
| 586 | x = xfrm_state_construct(net, p, attrs, &err); |
| 587 | if (!x) |
| 588 | return err; |
| 589 | |
| 590 | xfrm_state_hold(x); |
| 591 | if (nlh->nlmsg_type == XFRM_MSG_NEWSA) |
| 592 | err = xfrm_state_add(x); |
| 593 | else |
| 594 | err = xfrm_state_update(x); |
| 595 | |
| 596 | security_task_getsecid(current, &sid); |
| 597 | xfrm_audit_state_add(x, err ? 0 : 1, loginuid, sessionid, sid); |
| 598 | |
| 599 | if (err < 0) { |
| 600 | x->km.state = XFRM_STATE_DEAD; |
| 601 | __xfrm_state_put(x); |
| 602 | goto out; |
| 603 | } |
| 604 | |
| 605 | c.seq = nlh->nlmsg_seq; |
| 606 | c.portid = nlh->nlmsg_pid; |
| 607 | c.event = nlh->nlmsg_type; |
| 608 | |
| 609 | km_state_notify(x, &c); |
| 610 | out: |
| 611 | xfrm_state_put(x); |
| 612 | return err; |
| 613 | } |
| 614 | |
| 615 | static struct xfrm_state *xfrm_user_state_lookup(struct net *net, |
| 616 | struct xfrm_usersa_id *p, |
| 617 | struct nlattr **attrs, |
| 618 | int *errp) |
| 619 | { |
| 620 | struct xfrm_state *x = NULL; |
| 621 | struct xfrm_mark m; |
| 622 | int err; |
| 623 | u32 mark = xfrm_mark_get(attrs, &m); |
| 624 | |
| 625 | if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) { |
| 626 | err = -ESRCH; |
| 627 | x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family); |
| 628 | } else { |
| 629 | xfrm_address_t *saddr = NULL; |
| 630 | |
| 631 | verify_one_addr(attrs, XFRMA_SRCADDR, &saddr); |
| 632 | if (!saddr) { |
| 633 | err = -EINVAL; |
| 634 | goto out; |
| 635 | } |
| 636 | |
| 637 | err = -ESRCH; |
| 638 | x = xfrm_state_lookup_byaddr(net, mark, |
| 639 | &p->daddr, saddr, |
| 640 | p->proto, p->family); |
| 641 | } |
| 642 | |
| 643 | out: |
| 644 | if (!x && errp) |
| 645 | *errp = err; |
| 646 | return x; |
| 647 | } |
| 648 | |
| 649 | static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh, |
| 650 | struct nlattr **attrs) |
| 651 | { |
| 652 | struct net *net = sock_net(skb->sk); |
| 653 | struct xfrm_state *x; |
| 654 | int err = -ESRCH; |
| 655 | struct km_event c; |
| 656 | struct xfrm_usersa_id *p = nlmsg_data(nlh); |
| 657 | uid_t loginuid = audit_get_loginuid(current); |
| 658 | u32 sessionid = audit_get_sessionid(current); |
| 659 | u32 sid; |
| 660 | |
| 661 | x = xfrm_user_state_lookup(net, p, attrs, &err); |
| 662 | if (x == NULL) |
| 663 | return err; |
| 664 | |
| 665 | if ((err = security_xfrm_state_delete(x)) != 0) |
| 666 | goto out; |
| 667 | |
| 668 | if (xfrm_state_kern(x)) { |
| 669 | err = -EPERM; |
| 670 | goto out; |
| 671 | } |
| 672 | |
| 673 | err = xfrm_state_delete(x); |
| 674 | |
| 675 | if (err < 0) |
| 676 | goto out; |
| 677 | |
| 678 | c.seq = nlh->nlmsg_seq; |
| 679 | c.portid = nlh->nlmsg_pid; |
| 680 | c.event = nlh->nlmsg_type; |
| 681 | km_state_notify(x, &c); |
| 682 | |
| 683 | out: |
| 684 | security_task_getsecid(current, &sid); |
| 685 | xfrm_audit_state_delete(x, err ? 0 : 1, loginuid, sessionid, sid); |
| 686 | xfrm_state_put(x); |
| 687 | return err; |
| 688 | } |
| 689 | |
| 690 | static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p) |
| 691 | { |
| 692 | memcpy(&p->id, &x->id, sizeof(p->id)); |
| 693 | memcpy(&p->sel, &x->sel, sizeof(p->sel)); |
| 694 | memcpy(&p->lft, &x->lft, sizeof(p->lft)); |
| 695 | memcpy(&p->curlft, &x->curlft, sizeof(p->curlft)); |
| 696 | memcpy(&p->stats, &x->stats, sizeof(p->stats)); |
| 697 | memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr)); |
| 698 | p->mode = x->props.mode; |
| 699 | p->replay_window = x->props.replay_window; |
| 700 | p->reqid = x->props.reqid; |
| 701 | p->family = x->props.family; |
| 702 | p->flags = x->props.flags; |
| 703 | p->seq = x->km.seq; |
| 704 | } |
| 705 | |
| 706 | struct xfrm_dump_info { |
| 707 | struct sk_buff *in_skb; |
| 708 | struct sk_buff *out_skb; |
| 709 | u32 nlmsg_seq; |
| 710 | u16 nlmsg_flags; |
| 711 | }; |
| 712 | |
| 713 | static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb) |
| 714 | { |
| 715 | struct xfrm_user_sec_ctx *uctx; |
| 716 | struct nlattr *attr; |
| 717 | int ctx_size = sizeof(*uctx) + s->ctx_len; |
| 718 | |
| 719 | attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size); |
| 720 | if (attr == NULL) |
| 721 | return -EMSGSIZE; |
| 722 | |
| 723 | uctx = nla_data(attr); |
| 724 | uctx->exttype = XFRMA_SEC_CTX; |
| 725 | uctx->len = ctx_size; |
| 726 | uctx->ctx_doi = s->ctx_doi; |
| 727 | uctx->ctx_alg = s->ctx_alg; |
| 728 | uctx->ctx_len = s->ctx_len; |
| 729 | memcpy(uctx + 1, s->ctx_str, s->ctx_len); |
| 730 | |
| 731 | return 0; |
| 732 | } |
| 733 | |
| 734 | static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb) |
| 735 | { |
| 736 | struct xfrm_algo *algo; |
| 737 | struct nlattr *nla; |
| 738 | |
| 739 | nla = nla_reserve(skb, XFRMA_ALG_AUTH, |
| 740 | sizeof(*algo) + (auth->alg_key_len + 7) / 8); |
| 741 | if (!nla) |
| 742 | return -EMSGSIZE; |
| 743 | |
| 744 | algo = nla_data(nla); |
| 745 | strcpy(algo->alg_name, auth->alg_name); |
| 746 | memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8); |
| 747 | algo->alg_key_len = auth->alg_key_len; |
| 748 | |
| 749 | return 0; |
| 750 | } |
| 751 | |
| 752 | /* Don't change this without updating xfrm_sa_len! */ |
| 753 | static int copy_to_user_state_extra(struct xfrm_state *x, |
| 754 | struct xfrm_usersa_info *p, |
| 755 | struct sk_buff *skb) |
| 756 | { |
| 757 | int ret = 0; |
| 758 | |
| 759 | copy_to_user_state(x, p); |
| 760 | |
| 761 | if (x->coaddr) { |
| 762 | ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr); |
| 763 | if (ret) |
| 764 | goto out; |
| 765 | } |
| 766 | if (x->lastused) { |
| 767 | ret = nla_put_u64(skb, XFRMA_LASTUSED, x->lastused); |
| 768 | if (ret) |
| 769 | goto out; |
| 770 | } |
| 771 | if (x->aead) { |
| 772 | ret = nla_put(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead); |
| 773 | if (ret) |
| 774 | goto out; |
| 775 | } |
| 776 | if (x->aalg) { |
| 777 | ret = copy_to_user_auth(x->aalg, skb); |
| 778 | if (!ret) |
| 779 | ret = nla_put(skb, XFRMA_ALG_AUTH_TRUNC, |
| 780 | xfrm_alg_auth_len(x->aalg), x->aalg); |
| 781 | if (ret) |
| 782 | goto out; |
| 783 | } |
| 784 | if (x->ealg) { |
| 785 | ret = nla_put(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg); |
| 786 | if (ret) |
| 787 | goto out; |
| 788 | } |
| 789 | if (x->calg) { |
| 790 | ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg); |
| 791 | if (ret) |
| 792 | goto out; |
| 793 | } |
| 794 | if (x->encap) { |
| 795 | ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap); |
| 796 | if (ret) |
| 797 | goto out; |
| 798 | } |
| 799 | if (x->tfcpad) { |
| 800 | ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad); |
| 801 | if (ret) |
| 802 | goto out; |
| 803 | } |
| 804 | ret = xfrm_mark_put(skb, &x->mark); |
| 805 | if (ret) |
| 806 | goto out; |
| 807 | if (x->replay_esn) { |
| 808 | ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL, |
| 809 | xfrm_replay_state_esn_len(x->replay_esn), |
| 810 | x->replay_esn); |
| 811 | if (ret) |
| 812 | goto out; |
| 813 | } |
| 814 | if (x->security) |
| 815 | ret = copy_sec_ctx(x->security, skb); |
| 816 | out: |
| 817 | return ret; |
| 818 | } |
| 819 | |
| 820 | static int dump_one_state(struct xfrm_state *x, int count, void *ptr) |
| 821 | { |
| 822 | struct xfrm_dump_info *sp = ptr; |
| 823 | struct sk_buff *in_skb = sp->in_skb; |
| 824 | struct sk_buff *skb = sp->out_skb; |
| 825 | struct xfrm_usersa_info *p; |
| 826 | struct nlmsghdr *nlh; |
| 827 | int err; |
| 828 | |
| 829 | nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq, |
| 830 | XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags); |
| 831 | if (nlh == NULL) |
| 832 | return -EMSGSIZE; |
| 833 | |
| 834 | p = nlmsg_data(nlh); |
| 835 | |
| 836 | err = copy_to_user_state_extra(x, p, skb); |
| 837 | if (err) { |
| 838 | nlmsg_cancel(skb, nlh); |
| 839 | return err; |
| 840 | } |
| 841 | nlmsg_end(skb, nlh); |
| 842 | return 0; |
| 843 | } |
| 844 | |
| 845 | static int xfrm_dump_sa_done(struct netlink_callback *cb) |
| 846 | { |
| 847 | struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1]; |
| 848 | xfrm_state_walk_done(walk); |
| 849 | return 0; |
| 850 | } |
| 851 | |
| 852 | static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb) |
| 853 | { |
| 854 | struct net *net = sock_net(skb->sk); |
| 855 | struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1]; |
| 856 | struct xfrm_dump_info info; |
| 857 | |
| 858 | BUILD_BUG_ON(sizeof(struct xfrm_state_walk) > |
| 859 | sizeof(cb->args) - sizeof(cb->args[0])); |
| 860 | |
| 861 | info.in_skb = cb->skb; |
| 862 | info.out_skb = skb; |
| 863 | info.nlmsg_seq = cb->nlh->nlmsg_seq; |
| 864 | info.nlmsg_flags = NLM_F_MULTI; |
| 865 | |
| 866 | if (!cb->args[0]) { |
| 867 | cb->args[0] = 1; |
| 868 | xfrm_state_walk_init(walk, 0); |
| 869 | } |
| 870 | |
| 871 | (void) xfrm_state_walk(net, walk, dump_one_state, &info); |
| 872 | |
| 873 | return skb->len; |
| 874 | } |
| 875 | |
| 876 | static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb, |
| 877 | struct xfrm_state *x, u32 seq) |
| 878 | { |
| 879 | struct xfrm_dump_info info; |
| 880 | struct sk_buff *skb; |
| 881 | |
| 882 | skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); |
| 883 | if (!skb) |
| 884 | return ERR_PTR(-ENOMEM); |
| 885 | |
| 886 | info.in_skb = in_skb; |
| 887 | info.out_skb = skb; |
| 888 | info.nlmsg_seq = seq; |
| 889 | info.nlmsg_flags = 0; |
| 890 | |
| 891 | if (dump_one_state(x, 0, &info)) { |
| 892 | kfree_skb(skb); |
| 893 | return NULL; |
| 894 | } |
| 895 | |
| 896 | return skb; |
| 897 | } |
| 898 | |
| 899 | static inline size_t xfrm_spdinfo_msgsize(void) |
| 900 | { |
| 901 | return NLMSG_ALIGN(4) |
| 902 | + nla_total_size(sizeof(struct xfrmu_spdinfo)) |
| 903 | + nla_total_size(sizeof(struct xfrmu_spdhinfo)); |
| 904 | } |
| 905 | |
| 906 | static int build_spdinfo(struct sk_buff *skb, struct net *net, |
| 907 | u32 portid, u32 seq, u32 flags) |
| 908 | { |
| 909 | struct xfrmk_spdinfo si; |
| 910 | struct xfrmu_spdinfo spc; |
| 911 | struct xfrmu_spdhinfo sph; |
| 912 | struct nlmsghdr *nlh; |
| 913 | int err; |
| 914 | u32 *f; |
| 915 | |
| 916 | nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0); |
| 917 | if (nlh == NULL) /* shouldn't really happen ... */ |
| 918 | return -EMSGSIZE; |
| 919 | |
| 920 | f = nlmsg_data(nlh); |
| 921 | *f = flags; |
| 922 | xfrm_spd_getinfo(net, &si); |
| 923 | spc.incnt = si.incnt; |
| 924 | spc.outcnt = si.outcnt; |
| 925 | spc.fwdcnt = si.fwdcnt; |
| 926 | spc.inscnt = si.inscnt; |
| 927 | spc.outscnt = si.outscnt; |
| 928 | spc.fwdscnt = si.fwdscnt; |
| 929 | sph.spdhcnt = si.spdhcnt; |
| 930 | sph.spdhmcnt = si.spdhmcnt; |
| 931 | |
| 932 | err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc); |
| 933 | if (!err) |
| 934 | err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph); |
| 935 | if (err) { |
| 936 | nlmsg_cancel(skb, nlh); |
| 937 | return err; |
| 938 | } |
| 939 | |
| 940 | return nlmsg_end(skb, nlh); |
| 941 | } |
| 942 | |
| 943 | static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh, |
| 944 | struct nlattr **attrs) |
| 945 | { |
| 946 | struct net *net = sock_net(skb->sk); |
| 947 | struct sk_buff *r_skb; |
| 948 | u32 *flags = nlmsg_data(nlh); |
| 949 | u32 sportid = NETLINK_CB(skb).portid; |
| 950 | u32 seq = nlh->nlmsg_seq; |
| 951 | |
| 952 | r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC); |
| 953 | if (r_skb == NULL) |
| 954 | return -ENOMEM; |
| 955 | |
| 956 | if (build_spdinfo(r_skb, net, sportid, seq, *flags) < 0) |
| 957 | BUG(); |
| 958 | |
| 959 | return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid); |
| 960 | } |
| 961 | |
| 962 | static inline size_t xfrm_sadinfo_msgsize(void) |
| 963 | { |
| 964 | return NLMSG_ALIGN(4) |
| 965 | + nla_total_size(sizeof(struct xfrmu_sadhinfo)) |
| 966 | + nla_total_size(4); /* XFRMA_SAD_CNT */ |
| 967 | } |
| 968 | |
| 969 | static int build_sadinfo(struct sk_buff *skb, struct net *net, |
| 970 | u32 portid, u32 seq, u32 flags) |
| 971 | { |
| 972 | struct xfrmk_sadinfo si; |
| 973 | struct xfrmu_sadhinfo sh; |
| 974 | struct nlmsghdr *nlh; |
| 975 | int err; |
| 976 | u32 *f; |
| 977 | |
| 978 | nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0); |
| 979 | if (nlh == NULL) /* shouldn't really happen ... */ |
| 980 | return -EMSGSIZE; |
| 981 | |
| 982 | f = nlmsg_data(nlh); |
| 983 | *f = flags; |
| 984 | xfrm_sad_getinfo(net, &si); |
| 985 | |
| 986 | sh.sadhmcnt = si.sadhmcnt; |
| 987 | sh.sadhcnt = si.sadhcnt; |
| 988 | |
| 989 | err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt); |
| 990 | if (!err) |
| 991 | err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh); |
| 992 | if (err) { |
| 993 | nlmsg_cancel(skb, nlh); |
| 994 | return err; |
| 995 | } |
| 996 | |
| 997 | return nlmsg_end(skb, nlh); |
| 998 | } |
| 999 | |
| 1000 | static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh, |
| 1001 | struct nlattr **attrs) |
| 1002 | { |
| 1003 | struct net *net = sock_net(skb->sk); |
| 1004 | struct sk_buff *r_skb; |
| 1005 | u32 *flags = nlmsg_data(nlh); |
| 1006 | u32 sportid = NETLINK_CB(skb).portid; |
| 1007 | u32 seq = nlh->nlmsg_seq; |
| 1008 | |
| 1009 | r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC); |
| 1010 | if (r_skb == NULL) |
| 1011 | return -ENOMEM; |
| 1012 | |
| 1013 | if (build_sadinfo(r_skb, net, sportid, seq, *flags) < 0) |
| 1014 | BUG(); |
| 1015 | |
| 1016 | return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid); |
| 1017 | } |
| 1018 | |
| 1019 | static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh, |
| 1020 | struct nlattr **attrs) |
| 1021 | { |
| 1022 | struct net *net = sock_net(skb->sk); |
| 1023 | struct xfrm_usersa_id *p = nlmsg_data(nlh); |
| 1024 | struct xfrm_state *x; |
| 1025 | struct sk_buff *resp_skb; |
| 1026 | int err = -ESRCH; |
| 1027 | |
| 1028 | x = xfrm_user_state_lookup(net, p, attrs, &err); |
| 1029 | if (x == NULL) |
| 1030 | goto out_noput; |
| 1031 | |
| 1032 | resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); |
| 1033 | if (IS_ERR(resp_skb)) { |
| 1034 | err = PTR_ERR(resp_skb); |
| 1035 | } else { |
| 1036 | err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid); |
| 1037 | } |
| 1038 | xfrm_state_put(x); |
| 1039 | out_noput: |
| 1040 | return err; |
| 1041 | } |
| 1042 | |
| 1043 | static int verify_userspi_info(struct xfrm_userspi_info *p) |
| 1044 | { |
| 1045 | switch (p->info.id.proto) { |
| 1046 | case IPPROTO_AH: |
| 1047 | case IPPROTO_ESP: |
| 1048 | break; |
| 1049 | |
| 1050 | case IPPROTO_COMP: |
| 1051 | /* IPCOMP spi is 16-bits. */ |
| 1052 | if (p->max >= 0x10000) |
| 1053 | return -EINVAL; |
| 1054 | break; |
| 1055 | |
| 1056 | default: |
| 1057 | return -EINVAL; |
| 1058 | } |
| 1059 | |
| 1060 | if (p->min > p->max) |
| 1061 | return -EINVAL; |
| 1062 | |
| 1063 | return 0; |
| 1064 | } |
| 1065 | |
| 1066 | static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh, |
| 1067 | struct nlattr **attrs) |
| 1068 | { |
| 1069 | struct net *net = sock_net(skb->sk); |
| 1070 | struct xfrm_state *x; |
| 1071 | struct xfrm_userspi_info *p; |
| 1072 | struct sk_buff *resp_skb; |
| 1073 | xfrm_address_t *daddr; |
| 1074 | int family; |
| 1075 | int err; |
| 1076 | u32 mark; |
| 1077 | struct xfrm_mark m; |
| 1078 | |
| 1079 | p = nlmsg_data(nlh); |
| 1080 | err = verify_userspi_info(p); |
| 1081 | if (err) |
| 1082 | goto out_noput; |
| 1083 | |
| 1084 | family = p->info.family; |
| 1085 | daddr = &p->info.id.daddr; |
| 1086 | |
| 1087 | x = NULL; |
| 1088 | |
| 1089 | mark = xfrm_mark_get(attrs, &m); |
| 1090 | if (p->info.seq) { |
| 1091 | x = xfrm_find_acq_byseq(net, mark, p->info.seq); |
| 1092 | if (x && xfrm_addr_cmp(&x->id.daddr, daddr, family)) { |
| 1093 | xfrm_state_put(x); |
| 1094 | x = NULL; |
| 1095 | } |
| 1096 | } |
| 1097 | |
| 1098 | if (!x) |
| 1099 | x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid, |
| 1100 | p->info.id.proto, daddr, |
| 1101 | &p->info.saddr, 1, |
| 1102 | family); |
| 1103 | err = -ENOENT; |
| 1104 | if (x == NULL) |
| 1105 | goto out_noput; |
| 1106 | |
| 1107 | err = xfrm_alloc_spi(x, p->min, p->max); |
| 1108 | if (err) |
| 1109 | goto out; |
| 1110 | |
| 1111 | resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); |
| 1112 | if (IS_ERR(resp_skb)) { |
| 1113 | err = PTR_ERR(resp_skb); |
| 1114 | goto out; |
| 1115 | } |
| 1116 | |
| 1117 | err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid); |
| 1118 | |
| 1119 | out: |
| 1120 | xfrm_state_put(x); |
| 1121 | out_noput: |
| 1122 | return err; |
| 1123 | } |
| 1124 | |
| 1125 | static int verify_policy_dir(u8 dir) |
| 1126 | { |
| 1127 | switch (dir) { |
| 1128 | case XFRM_POLICY_IN: |
| 1129 | case XFRM_POLICY_OUT: |
| 1130 | case XFRM_POLICY_FWD: |
| 1131 | break; |
| 1132 | |
| 1133 | default: |
| 1134 | return -EINVAL; |
| 1135 | } |
| 1136 | |
| 1137 | return 0; |
| 1138 | } |
| 1139 | |
| 1140 | static int verify_policy_type(u8 type) |
| 1141 | { |
| 1142 | switch (type) { |
| 1143 | case XFRM_POLICY_TYPE_MAIN: |
| 1144 | #ifdef CONFIG_XFRM_SUB_POLICY |
| 1145 | case XFRM_POLICY_TYPE_SUB: |
| 1146 | #endif |
| 1147 | break; |
| 1148 | |
| 1149 | default: |
| 1150 | return -EINVAL; |
| 1151 | } |
| 1152 | |
| 1153 | return 0; |
| 1154 | } |
| 1155 | |
| 1156 | static int verify_newpolicy_info(struct xfrm_userpolicy_info *p) |
| 1157 | { |
| 1158 | switch (p->share) { |
| 1159 | case XFRM_SHARE_ANY: |
| 1160 | case XFRM_SHARE_SESSION: |
| 1161 | case XFRM_SHARE_USER: |
| 1162 | case XFRM_SHARE_UNIQUE: |
| 1163 | break; |
| 1164 | |
| 1165 | default: |
| 1166 | return -EINVAL; |
| 1167 | } |
| 1168 | |
| 1169 | switch (p->action) { |
| 1170 | case XFRM_POLICY_ALLOW: |
| 1171 | case XFRM_POLICY_BLOCK: |
| 1172 | break; |
| 1173 | |
| 1174 | default: |
| 1175 | return -EINVAL; |
| 1176 | } |
| 1177 | |
| 1178 | switch (p->sel.family) { |
| 1179 | case AF_INET: |
| 1180 | break; |
| 1181 | |
| 1182 | case AF_INET6: |
| 1183 | #if IS_ENABLED(CONFIG_IPV6) |
| 1184 | break; |
| 1185 | #else |
| 1186 | return -EAFNOSUPPORT; |
| 1187 | #endif |
| 1188 | |
| 1189 | default: |
| 1190 | return -EINVAL; |
| 1191 | } |
| 1192 | |
| 1193 | return verify_policy_dir(p->dir); |
| 1194 | } |
| 1195 | |
| 1196 | static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs) |
| 1197 | { |
| 1198 | struct nlattr *rt = attrs[XFRMA_SEC_CTX]; |
| 1199 | struct xfrm_user_sec_ctx *uctx; |
| 1200 | |
| 1201 | if (!rt) |
| 1202 | return 0; |
| 1203 | |
| 1204 | uctx = nla_data(rt); |
| 1205 | return security_xfrm_policy_alloc(&pol->security, uctx); |
| 1206 | } |
| 1207 | |
| 1208 | static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut, |
| 1209 | int nr) |
| 1210 | { |
| 1211 | int i; |
| 1212 | |
| 1213 | xp->xfrm_nr = nr; |
| 1214 | for (i = 0; i < nr; i++, ut++) { |
| 1215 | struct xfrm_tmpl *t = &xp->xfrm_vec[i]; |
| 1216 | |
| 1217 | memcpy(&t->id, &ut->id, sizeof(struct xfrm_id)); |
| 1218 | memcpy(&t->saddr, &ut->saddr, |
| 1219 | sizeof(xfrm_address_t)); |
| 1220 | t->reqid = ut->reqid; |
| 1221 | t->mode = ut->mode; |
| 1222 | t->share = ut->share; |
| 1223 | t->optional = ut->optional; |
| 1224 | t->aalgos = ut->aalgos; |
| 1225 | t->ealgos = ut->ealgos; |
| 1226 | t->calgos = ut->calgos; |
| 1227 | /* If all masks are ~0, then we allow all algorithms. */ |
| 1228 | t->allalgs = !~(t->aalgos & t->ealgos & t->calgos); |
| 1229 | t->encap_family = ut->family; |
| 1230 | } |
| 1231 | } |
| 1232 | |
| 1233 | static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family) |
| 1234 | { |
| 1235 | int i; |
| 1236 | |
| 1237 | if (nr > XFRM_MAX_DEPTH) |
| 1238 | return -EINVAL; |
| 1239 | |
| 1240 | for (i = 0; i < nr; i++) { |
| 1241 | /* We never validated the ut->family value, so many |
| 1242 | * applications simply leave it at zero. The check was |
| 1243 | * never made and ut->family was ignored because all |
| 1244 | * templates could be assumed to have the same family as |
| 1245 | * the policy itself. Now that we will have ipv4-in-ipv6 |
| 1246 | * and ipv6-in-ipv4 tunnels, this is no longer true. |
| 1247 | */ |
| 1248 | if (!ut[i].family) |
| 1249 | ut[i].family = family; |
| 1250 | |
| 1251 | switch (ut[i].family) { |
| 1252 | case AF_INET: |
| 1253 | break; |
| 1254 | #if IS_ENABLED(CONFIG_IPV6) |
| 1255 | case AF_INET6: |
| 1256 | break; |
| 1257 | #endif |
| 1258 | default: |
| 1259 | return -EINVAL; |
| 1260 | } |
| 1261 | } |
| 1262 | |
| 1263 | return 0; |
| 1264 | } |
| 1265 | |
| 1266 | static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs) |
| 1267 | { |
| 1268 | struct nlattr *rt = attrs[XFRMA_TMPL]; |
| 1269 | |
| 1270 | if (!rt) { |
| 1271 | pol->xfrm_nr = 0; |
| 1272 | } else { |
| 1273 | struct xfrm_user_tmpl *utmpl = nla_data(rt); |
| 1274 | int nr = nla_len(rt) / sizeof(*utmpl); |
| 1275 | int err; |
| 1276 | |
| 1277 | err = validate_tmpl(nr, utmpl, pol->family); |
| 1278 | if (err) |
| 1279 | return err; |
| 1280 | |
| 1281 | copy_templates(pol, utmpl, nr); |
| 1282 | } |
| 1283 | return 0; |
| 1284 | } |
| 1285 | |
| 1286 | static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs) |
| 1287 | { |
| 1288 | struct nlattr *rt = attrs[XFRMA_POLICY_TYPE]; |
| 1289 | struct xfrm_userpolicy_type *upt; |
| 1290 | u8 type = XFRM_POLICY_TYPE_MAIN; |
| 1291 | int err; |
| 1292 | |
| 1293 | if (rt) { |
| 1294 | upt = nla_data(rt); |
| 1295 | type = upt->type; |
| 1296 | } |
| 1297 | |
| 1298 | err = verify_policy_type(type); |
| 1299 | if (err) |
| 1300 | return err; |
| 1301 | |
| 1302 | *tp = type; |
| 1303 | return 0; |
| 1304 | } |
| 1305 | |
| 1306 | static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p) |
| 1307 | { |
| 1308 | xp->priority = p->priority; |
| 1309 | xp->index = p->index; |
| 1310 | memcpy(&xp->selector, &p->sel, sizeof(xp->selector)); |
| 1311 | memcpy(&xp->lft, &p->lft, sizeof(xp->lft)); |
| 1312 | xp->action = p->action; |
| 1313 | xp->flags = p->flags; |
| 1314 | xp->family = p->sel.family; |
| 1315 | /* XXX xp->share = p->share; */ |
| 1316 | } |
| 1317 | |
| 1318 | static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir) |
| 1319 | { |
| 1320 | memcpy(&p->sel, &xp->selector, sizeof(p->sel)); |
| 1321 | memcpy(&p->lft, &xp->lft, sizeof(p->lft)); |
| 1322 | memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft)); |
| 1323 | p->priority = xp->priority; |
| 1324 | p->index = xp->index; |
| 1325 | p->sel.family = xp->family; |
| 1326 | p->dir = dir; |
| 1327 | p->action = xp->action; |
| 1328 | p->flags = xp->flags; |
| 1329 | p->share = XFRM_SHARE_ANY; /* XXX xp->share */ |
| 1330 | } |
| 1331 | |
| 1332 | static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp) |
| 1333 | { |
| 1334 | struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL); |
| 1335 | int err; |
| 1336 | |
| 1337 | if (!xp) { |
| 1338 | *errp = -ENOMEM; |
| 1339 | return NULL; |
| 1340 | } |
| 1341 | |
| 1342 | copy_from_user_policy(xp, p); |
| 1343 | |
| 1344 | err = copy_from_user_policy_type(&xp->type, attrs); |
| 1345 | if (err) |
| 1346 | goto error; |
| 1347 | |
| 1348 | if (!(err = copy_from_user_tmpl(xp, attrs))) |
| 1349 | err = copy_from_user_sec_ctx(xp, attrs); |
| 1350 | if (err) |
| 1351 | goto error; |
| 1352 | |
| 1353 | xfrm_mark_get(attrs, &xp->mark); |
| 1354 | |
| 1355 | return xp; |
| 1356 | error: |
| 1357 | *errp = err; |
| 1358 | xp->walk.dead = 1; |
| 1359 | xfrm_policy_destroy(xp); |
| 1360 | return NULL; |
| 1361 | } |
| 1362 | |
| 1363 | static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh, |
| 1364 | struct nlattr **attrs) |
| 1365 | { |
| 1366 | struct net *net = sock_net(skb->sk); |
| 1367 | struct xfrm_userpolicy_info *p = nlmsg_data(nlh); |
| 1368 | struct xfrm_policy *xp; |
| 1369 | struct km_event c; |
| 1370 | int err; |
| 1371 | int excl; |
| 1372 | uid_t loginuid = audit_get_loginuid(current); |
| 1373 | u32 sessionid = audit_get_sessionid(current); |
| 1374 | u32 sid; |
| 1375 | |
| 1376 | err = verify_newpolicy_info(p); |
| 1377 | if (err) |
| 1378 | return err; |
| 1379 | err = verify_sec_ctx_len(attrs); |
| 1380 | if (err) |
| 1381 | return err; |
| 1382 | |
| 1383 | xp = xfrm_policy_construct(net, p, attrs, &err); |
| 1384 | if (!xp) |
| 1385 | return err; |
| 1386 | |
| 1387 | /* shouldn't excl be based on nlh flags?? |
| 1388 | * Aha! this is anti-netlink really i.e more pfkey derived |
| 1389 | * in netlink excl is a flag and you wouldnt need |
| 1390 | * a type XFRM_MSG_UPDPOLICY - JHS */ |
| 1391 | excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY; |
| 1392 | err = xfrm_policy_insert(p->dir, xp, excl); |
| 1393 | security_task_getsecid(current, &sid); |
| 1394 | xfrm_audit_policy_add(xp, err ? 0 : 1, loginuid, sessionid, sid); |
| 1395 | |
| 1396 | if (err) { |
| 1397 | security_xfrm_policy_free(xp->security); |
| 1398 | kfree(xp); |
| 1399 | return err; |
| 1400 | } |
| 1401 | |
| 1402 | c.event = nlh->nlmsg_type; |
| 1403 | c.seq = nlh->nlmsg_seq; |
| 1404 | c.portid = nlh->nlmsg_pid; |
| 1405 | km_policy_notify(xp, p->dir, &c); |
| 1406 | |
| 1407 | xfrm_pol_put(xp); |
| 1408 | |
| 1409 | return 0; |
| 1410 | } |
| 1411 | |
| 1412 | static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb) |
| 1413 | { |
| 1414 | struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH]; |
| 1415 | int i; |
| 1416 | |
| 1417 | if (xp->xfrm_nr == 0) |
| 1418 | return 0; |
| 1419 | |
| 1420 | for (i = 0; i < xp->xfrm_nr; i++) { |
| 1421 | struct xfrm_user_tmpl *up = &vec[i]; |
| 1422 | struct xfrm_tmpl *kp = &xp->xfrm_vec[i]; |
| 1423 | |
| 1424 | memcpy(&up->id, &kp->id, sizeof(up->id)); |
| 1425 | up->family = kp->encap_family; |
| 1426 | memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr)); |
| 1427 | up->reqid = kp->reqid; |
| 1428 | up->mode = kp->mode; |
| 1429 | up->share = kp->share; |
| 1430 | up->optional = kp->optional; |
| 1431 | up->aalgos = kp->aalgos; |
| 1432 | up->ealgos = kp->ealgos; |
| 1433 | up->calgos = kp->calgos; |
| 1434 | } |
| 1435 | |
| 1436 | return nla_put(skb, XFRMA_TMPL, |
| 1437 | sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec); |
| 1438 | } |
| 1439 | |
| 1440 | static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb) |
| 1441 | { |
| 1442 | if (x->security) { |
| 1443 | return copy_sec_ctx(x->security, skb); |
| 1444 | } |
| 1445 | return 0; |
| 1446 | } |
| 1447 | |
| 1448 | static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb) |
| 1449 | { |
| 1450 | if (xp->security) |
| 1451 | return copy_sec_ctx(xp->security, skb); |
| 1452 | return 0; |
| 1453 | } |
| 1454 | static inline size_t userpolicy_type_attrsize(void) |
| 1455 | { |
| 1456 | #ifdef CONFIG_XFRM_SUB_POLICY |
| 1457 | return nla_total_size(sizeof(struct xfrm_userpolicy_type)); |
| 1458 | #else |
| 1459 | return 0; |
| 1460 | #endif |
| 1461 | } |
| 1462 | |
| 1463 | #ifdef CONFIG_XFRM_SUB_POLICY |
| 1464 | static int copy_to_user_policy_type(u8 type, struct sk_buff *skb) |
| 1465 | { |
| 1466 | struct xfrm_userpolicy_type upt = { |
| 1467 | .type = type, |
| 1468 | }; |
| 1469 | |
| 1470 | return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt); |
| 1471 | } |
| 1472 | |
| 1473 | #else |
| 1474 | static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb) |
| 1475 | { |
| 1476 | return 0; |
| 1477 | } |
| 1478 | #endif |
| 1479 | |
| 1480 | static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr) |
| 1481 | { |
| 1482 | struct xfrm_dump_info *sp = ptr; |
| 1483 | struct xfrm_userpolicy_info *p; |
| 1484 | struct sk_buff *in_skb = sp->in_skb; |
| 1485 | struct sk_buff *skb = sp->out_skb; |
| 1486 | struct nlmsghdr *nlh; |
| 1487 | int err; |
| 1488 | |
| 1489 | nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq, |
| 1490 | XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags); |
| 1491 | if (nlh == NULL) |
| 1492 | return -EMSGSIZE; |
| 1493 | |
| 1494 | p = nlmsg_data(nlh); |
| 1495 | copy_to_user_policy(xp, p, dir); |
| 1496 | err = copy_to_user_tmpl(xp, skb); |
| 1497 | if (!err) |
| 1498 | err = copy_to_user_sec_ctx(xp, skb); |
| 1499 | if (!err) |
| 1500 | err = copy_to_user_policy_type(xp->type, skb); |
| 1501 | if (!err) |
| 1502 | err = xfrm_mark_put(skb, &xp->mark); |
| 1503 | if (err) { |
| 1504 | nlmsg_cancel(skb, nlh); |
| 1505 | return err; |
| 1506 | } |
| 1507 | nlmsg_end(skb, nlh); |
| 1508 | return 0; |
| 1509 | } |
| 1510 | |
| 1511 | static int xfrm_dump_policy_done(struct netlink_callback *cb) |
| 1512 | { |
| 1513 | struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1]; |
| 1514 | |
| 1515 | xfrm_policy_walk_done(walk); |
| 1516 | return 0; |
| 1517 | } |
| 1518 | |
| 1519 | static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb) |
| 1520 | { |
| 1521 | struct net *net = sock_net(skb->sk); |
| 1522 | struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1]; |
| 1523 | struct xfrm_dump_info info; |
| 1524 | |
| 1525 | BUILD_BUG_ON(sizeof(struct xfrm_policy_walk) > |
| 1526 | sizeof(cb->args) - sizeof(cb->args[0])); |
| 1527 | |
| 1528 | info.in_skb = cb->skb; |
| 1529 | info.out_skb = skb; |
| 1530 | info.nlmsg_seq = cb->nlh->nlmsg_seq; |
| 1531 | info.nlmsg_flags = NLM_F_MULTI; |
| 1532 | |
| 1533 | if (!cb->args[0]) { |
| 1534 | cb->args[0] = 1; |
| 1535 | xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY); |
| 1536 | } |
| 1537 | |
| 1538 | (void) xfrm_policy_walk(net, walk, dump_one_policy, &info); |
| 1539 | |
| 1540 | return skb->len; |
| 1541 | } |
| 1542 | |
| 1543 | static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb, |
| 1544 | struct xfrm_policy *xp, |
| 1545 | int dir, u32 seq) |
| 1546 | { |
| 1547 | struct xfrm_dump_info info; |
| 1548 | struct sk_buff *skb; |
| 1549 | |
| 1550 | skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
| 1551 | if (!skb) |
| 1552 | return ERR_PTR(-ENOMEM); |
| 1553 | |
| 1554 | info.in_skb = in_skb; |
| 1555 | info.out_skb = skb; |
| 1556 | info.nlmsg_seq = seq; |
| 1557 | info.nlmsg_flags = 0; |
| 1558 | |
| 1559 | if (dump_one_policy(xp, dir, 0, &info) < 0) { |
| 1560 | kfree_skb(skb); |
| 1561 | return NULL; |
| 1562 | } |
| 1563 | |
| 1564 | return skb; |
| 1565 | } |
| 1566 | |
| 1567 | static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh, |
| 1568 | struct nlattr **attrs) |
| 1569 | { |
| 1570 | struct net *net = sock_net(skb->sk); |
| 1571 | struct xfrm_policy *xp; |
| 1572 | struct xfrm_userpolicy_id *p; |
| 1573 | u8 type = XFRM_POLICY_TYPE_MAIN; |
| 1574 | int err; |
| 1575 | struct km_event c; |
| 1576 | int delete; |
| 1577 | struct xfrm_mark m; |
| 1578 | u32 mark = xfrm_mark_get(attrs, &m); |
| 1579 | |
| 1580 | p = nlmsg_data(nlh); |
| 1581 | delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY; |
| 1582 | |
| 1583 | err = copy_from_user_policy_type(&type, attrs); |
| 1584 | if (err) |
| 1585 | return err; |
| 1586 | |
| 1587 | err = verify_policy_dir(p->dir); |
| 1588 | if (err) |
| 1589 | return err; |
| 1590 | |
| 1591 | if (p->index) |
| 1592 | xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err); |
| 1593 | else { |
| 1594 | struct nlattr *rt = attrs[XFRMA_SEC_CTX]; |
| 1595 | struct xfrm_sec_ctx *ctx; |
| 1596 | |
| 1597 | err = verify_sec_ctx_len(attrs); |
| 1598 | if (err) |
| 1599 | return err; |
| 1600 | |
| 1601 | ctx = NULL; |
| 1602 | if (rt) { |
| 1603 | struct xfrm_user_sec_ctx *uctx = nla_data(rt); |
| 1604 | |
| 1605 | err = security_xfrm_policy_alloc(&ctx, uctx); |
| 1606 | if (err) |
| 1607 | return err; |
| 1608 | } |
| 1609 | xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel, |
| 1610 | ctx, delete, &err); |
| 1611 | security_xfrm_policy_free(ctx); |
| 1612 | } |
| 1613 | if (xp == NULL) |
| 1614 | return -ENOENT; |
| 1615 | |
| 1616 | if (!delete) { |
| 1617 | struct sk_buff *resp_skb; |
| 1618 | |
| 1619 | resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq); |
| 1620 | if (IS_ERR(resp_skb)) { |
| 1621 | err = PTR_ERR(resp_skb); |
| 1622 | } else { |
| 1623 | err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, |
| 1624 | NETLINK_CB(skb).portid); |
| 1625 | } |
| 1626 | } else { |
| 1627 | uid_t loginuid = audit_get_loginuid(current); |
| 1628 | u32 sessionid = audit_get_sessionid(current); |
| 1629 | u32 sid; |
| 1630 | |
| 1631 | security_task_getsecid(current, &sid); |
| 1632 | xfrm_audit_policy_delete(xp, err ? 0 : 1, loginuid, sessionid, |
| 1633 | sid); |
| 1634 | |
| 1635 | if (err != 0) |
| 1636 | goto out; |
| 1637 | |
| 1638 | c.data.byid = p->index; |
| 1639 | c.event = nlh->nlmsg_type; |
| 1640 | c.seq = nlh->nlmsg_seq; |
| 1641 | c.portid = nlh->nlmsg_pid; |
| 1642 | km_policy_notify(xp, p->dir, &c); |
| 1643 | } |
| 1644 | |
| 1645 | out: |
| 1646 | xfrm_pol_put(xp); |
| 1647 | return err; |
| 1648 | } |
| 1649 | |
| 1650 | static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh, |
| 1651 | struct nlattr **attrs) |
| 1652 | { |
| 1653 | struct net *net = sock_net(skb->sk); |
| 1654 | struct km_event c; |
| 1655 | struct xfrm_usersa_flush *p = nlmsg_data(nlh); |
| 1656 | struct xfrm_audit audit_info; |
| 1657 | int err; |
| 1658 | |
| 1659 | audit_info.loginuid = audit_get_loginuid(current); |
| 1660 | audit_info.sessionid = audit_get_sessionid(current); |
| 1661 | security_task_getsecid(current, &audit_info.secid); |
| 1662 | err = xfrm_state_flush(net, p->proto, &audit_info); |
| 1663 | if (err) { |
| 1664 | if (err == -ESRCH) /* empty table */ |
| 1665 | return 0; |
| 1666 | return err; |
| 1667 | } |
| 1668 | c.data.proto = p->proto; |
| 1669 | c.event = nlh->nlmsg_type; |
| 1670 | c.seq = nlh->nlmsg_seq; |
| 1671 | c.portid = nlh->nlmsg_pid; |
| 1672 | c.net = net; |
| 1673 | km_state_notify(NULL, &c); |
| 1674 | |
| 1675 | return 0; |
| 1676 | } |
| 1677 | |
| 1678 | static inline size_t xfrm_aevent_msgsize(struct xfrm_state *x) |
| 1679 | { |
| 1680 | size_t replay_size = x->replay_esn ? |
| 1681 | xfrm_replay_state_esn_len(x->replay_esn) : |
| 1682 | sizeof(struct xfrm_replay_state); |
| 1683 | |
| 1684 | return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id)) |
| 1685 | + nla_total_size(replay_size) |
| 1686 | + nla_total_size(sizeof(struct xfrm_lifetime_cur)) |
| 1687 | + nla_total_size(sizeof(struct xfrm_mark)) |
| 1688 | + nla_total_size(4) /* XFRM_AE_RTHR */ |
| 1689 | + nla_total_size(4); /* XFRM_AE_ETHR */ |
| 1690 | } |
| 1691 | |
| 1692 | static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c) |
| 1693 | { |
| 1694 | struct xfrm_aevent_id *id; |
| 1695 | struct nlmsghdr *nlh; |
| 1696 | int err; |
| 1697 | |
| 1698 | nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0); |
| 1699 | if (nlh == NULL) |
| 1700 | return -EMSGSIZE; |
| 1701 | |
| 1702 | id = nlmsg_data(nlh); |
| 1703 | memcpy(&id->sa_id.daddr, &x->id.daddr,sizeof(x->id.daddr)); |
| 1704 | id->sa_id.spi = x->id.spi; |
| 1705 | id->sa_id.family = x->props.family; |
| 1706 | id->sa_id.proto = x->id.proto; |
| 1707 | memcpy(&id->saddr, &x->props.saddr,sizeof(x->props.saddr)); |
| 1708 | id->reqid = x->props.reqid; |
| 1709 | id->flags = c->data.aevent; |
| 1710 | |
| 1711 | if (x->replay_esn) { |
| 1712 | err = nla_put(skb, XFRMA_REPLAY_ESN_VAL, |
| 1713 | xfrm_replay_state_esn_len(x->replay_esn), |
| 1714 | x->replay_esn); |
| 1715 | } else { |
| 1716 | err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), |
| 1717 | &x->replay); |
| 1718 | } |
| 1719 | if (err) |
| 1720 | goto out_cancel; |
| 1721 | err = nla_put(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft); |
| 1722 | if (err) |
| 1723 | goto out_cancel; |
| 1724 | |
| 1725 | if (id->flags & XFRM_AE_RTHR) { |
| 1726 | err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff); |
| 1727 | if (err) |
| 1728 | goto out_cancel; |
| 1729 | } |
| 1730 | if (id->flags & XFRM_AE_ETHR) { |
| 1731 | err = nla_put_u32(skb, XFRMA_ETIMER_THRESH, |
| 1732 | x->replay_maxage * 10 / HZ); |
| 1733 | if (err) |
| 1734 | goto out_cancel; |
| 1735 | } |
| 1736 | err = xfrm_mark_put(skb, &x->mark); |
| 1737 | if (err) |
| 1738 | goto out_cancel; |
| 1739 | |
| 1740 | return nlmsg_end(skb, nlh); |
| 1741 | |
| 1742 | out_cancel: |
| 1743 | nlmsg_cancel(skb, nlh); |
| 1744 | return err; |
| 1745 | } |
| 1746 | |
| 1747 | static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh, |
| 1748 | struct nlattr **attrs) |
| 1749 | { |
| 1750 | struct net *net = sock_net(skb->sk); |
| 1751 | struct xfrm_state *x; |
| 1752 | struct sk_buff *r_skb; |
| 1753 | int err; |
| 1754 | struct km_event c; |
| 1755 | u32 mark; |
| 1756 | struct xfrm_mark m; |
| 1757 | struct xfrm_aevent_id *p = nlmsg_data(nlh); |
| 1758 | struct xfrm_usersa_id *id = &p->sa_id; |
| 1759 | |
| 1760 | mark = xfrm_mark_get(attrs, &m); |
| 1761 | |
| 1762 | x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family); |
| 1763 | if (x == NULL) |
| 1764 | return -ESRCH; |
| 1765 | |
| 1766 | r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC); |
| 1767 | if (r_skb == NULL) { |
| 1768 | xfrm_state_put(x); |
| 1769 | return -ENOMEM; |
| 1770 | } |
| 1771 | |
| 1772 | /* |
| 1773 | * XXX: is this lock really needed - none of the other |
| 1774 | * gets lock (the concern is things getting updated |
| 1775 | * while we are still reading) - jhs |
| 1776 | */ |
| 1777 | spin_lock_bh(&x->lock); |
| 1778 | c.data.aevent = p->flags; |
| 1779 | c.seq = nlh->nlmsg_seq; |
| 1780 | c.portid = nlh->nlmsg_pid; |
| 1781 | |
| 1782 | if (build_aevent(r_skb, x, &c) < 0) |
| 1783 | BUG(); |
| 1784 | err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid); |
| 1785 | spin_unlock_bh(&x->lock); |
| 1786 | xfrm_state_put(x); |
| 1787 | return err; |
| 1788 | } |
| 1789 | |
| 1790 | static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh, |
| 1791 | struct nlattr **attrs) |
| 1792 | { |
| 1793 | struct net *net = sock_net(skb->sk); |
| 1794 | struct xfrm_state *x; |
| 1795 | struct km_event c; |
| 1796 | int err = - EINVAL; |
| 1797 | u32 mark = 0; |
| 1798 | struct xfrm_mark m; |
| 1799 | struct xfrm_aevent_id *p = nlmsg_data(nlh); |
| 1800 | struct nlattr *rp = attrs[XFRMA_REPLAY_VAL]; |
| 1801 | struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL]; |
| 1802 | struct nlattr *lt = attrs[XFRMA_LTIME_VAL]; |
| 1803 | |
| 1804 | if (!lt && !rp && !re) |
| 1805 | return err; |
| 1806 | |
| 1807 | /* pedantic mode - thou shalt sayeth replaceth */ |
| 1808 | if (!(nlh->nlmsg_flags&NLM_F_REPLACE)) |
| 1809 | return err; |
| 1810 | |
| 1811 | mark = xfrm_mark_get(attrs, &m); |
| 1812 | |
| 1813 | x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family); |
| 1814 | if (x == NULL) |
| 1815 | return -ESRCH; |
| 1816 | |
| 1817 | if (x->km.state != XFRM_STATE_VALID) |
| 1818 | goto out; |
| 1819 | |
| 1820 | err = xfrm_replay_verify_len(x->replay_esn, rp); |
| 1821 | if (err) |
| 1822 | goto out; |
| 1823 | |
| 1824 | spin_lock_bh(&x->lock); |
| 1825 | xfrm_update_ae_params(x, attrs); |
| 1826 | spin_unlock_bh(&x->lock); |
| 1827 | |
| 1828 | c.event = nlh->nlmsg_type; |
| 1829 | c.seq = nlh->nlmsg_seq; |
| 1830 | c.portid = nlh->nlmsg_pid; |
| 1831 | c.data.aevent = XFRM_AE_CU; |
| 1832 | km_state_notify(x, &c); |
| 1833 | err = 0; |
| 1834 | out: |
| 1835 | xfrm_state_put(x); |
| 1836 | return err; |
| 1837 | } |
| 1838 | |
| 1839 | static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh, |
| 1840 | struct nlattr **attrs) |
| 1841 | { |
| 1842 | struct net *net = sock_net(skb->sk); |
| 1843 | struct km_event c; |
| 1844 | u8 type = XFRM_POLICY_TYPE_MAIN; |
| 1845 | int err; |
| 1846 | struct xfrm_audit audit_info; |
| 1847 | |
| 1848 | err = copy_from_user_policy_type(&type, attrs); |
| 1849 | if (err) |
| 1850 | return err; |
| 1851 | |
| 1852 | audit_info.loginuid = audit_get_loginuid(current); |
| 1853 | audit_info.sessionid = audit_get_sessionid(current); |
| 1854 | security_task_getsecid(current, &audit_info.secid); |
| 1855 | err = xfrm_policy_flush(net, type, &audit_info); |
| 1856 | if (err) { |
| 1857 | if (err == -ESRCH) /* empty table */ |
| 1858 | return 0; |
| 1859 | return err; |
| 1860 | } |
| 1861 | |
| 1862 | c.data.type = type; |
| 1863 | c.event = nlh->nlmsg_type; |
| 1864 | c.seq = nlh->nlmsg_seq; |
| 1865 | c.portid = nlh->nlmsg_pid; |
| 1866 | c.net = net; |
| 1867 | km_policy_notify(NULL, 0, &c); |
| 1868 | return 0; |
| 1869 | } |
| 1870 | |
| 1871 | static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh, |
| 1872 | struct nlattr **attrs) |
| 1873 | { |
| 1874 | struct net *net = sock_net(skb->sk); |
| 1875 | struct xfrm_policy *xp; |
| 1876 | struct xfrm_user_polexpire *up = nlmsg_data(nlh); |
| 1877 | struct xfrm_userpolicy_info *p = &up->pol; |
| 1878 | u8 type = XFRM_POLICY_TYPE_MAIN; |
| 1879 | int err = -ENOENT; |
| 1880 | struct xfrm_mark m; |
| 1881 | u32 mark = xfrm_mark_get(attrs, &m); |
| 1882 | |
| 1883 | err = copy_from_user_policy_type(&type, attrs); |
| 1884 | if (err) |
| 1885 | return err; |
| 1886 | |
| 1887 | err = verify_policy_dir(p->dir); |
| 1888 | if (err) |
| 1889 | return err; |
| 1890 | |
| 1891 | if (p->index) |
| 1892 | xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err); |
| 1893 | else { |
| 1894 | struct nlattr *rt = attrs[XFRMA_SEC_CTX]; |
| 1895 | struct xfrm_sec_ctx *ctx; |
| 1896 | |
| 1897 | err = verify_sec_ctx_len(attrs); |
| 1898 | if (err) |
| 1899 | return err; |
| 1900 | |
| 1901 | ctx = NULL; |
| 1902 | if (rt) { |
| 1903 | struct xfrm_user_sec_ctx *uctx = nla_data(rt); |
| 1904 | |
| 1905 | err = security_xfrm_policy_alloc(&ctx, uctx); |
| 1906 | if (err) |
| 1907 | return err; |
| 1908 | } |
| 1909 | xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, |
| 1910 | &p->sel, ctx, 0, &err); |
| 1911 | security_xfrm_policy_free(ctx); |
| 1912 | } |
| 1913 | if (xp == NULL) |
| 1914 | return -ENOENT; |
| 1915 | |
| 1916 | if (unlikely(xp->walk.dead)) |
| 1917 | goto out; |
| 1918 | |
| 1919 | err = 0; |
| 1920 | if (up->hard) { |
| 1921 | uid_t loginuid = audit_get_loginuid(current); |
| 1922 | u32 sessionid = audit_get_sessionid(current); |
| 1923 | u32 sid; |
| 1924 | |
| 1925 | security_task_getsecid(current, &sid); |
| 1926 | xfrm_policy_delete(xp, p->dir); |
| 1927 | xfrm_audit_policy_delete(xp, 1, loginuid, sessionid, sid); |
| 1928 | |
| 1929 | } else { |
| 1930 | // reset the timers here? |
| 1931 | WARN(1, "Dont know what to do with soft policy expire\n"); |
| 1932 | } |
| 1933 | km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid); |
| 1934 | |
| 1935 | out: |
| 1936 | xfrm_pol_put(xp); |
| 1937 | return err; |
| 1938 | } |
| 1939 | |
| 1940 | static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh, |
| 1941 | struct nlattr **attrs) |
| 1942 | { |
| 1943 | struct net *net = sock_net(skb->sk); |
| 1944 | struct xfrm_state *x; |
| 1945 | int err; |
| 1946 | struct xfrm_user_expire *ue = nlmsg_data(nlh); |
| 1947 | struct xfrm_usersa_info *p = &ue->state; |
| 1948 | struct xfrm_mark m; |
| 1949 | u32 mark = xfrm_mark_get(attrs, &m); |
| 1950 | |
| 1951 | x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family); |
| 1952 | |
| 1953 | err = -ENOENT; |
| 1954 | if (x == NULL) |
| 1955 | return err; |
| 1956 | |
| 1957 | spin_lock_bh(&x->lock); |
| 1958 | err = -EINVAL; |
| 1959 | if (x->km.state != XFRM_STATE_VALID) |
| 1960 | goto out; |
| 1961 | km_state_expired(x, ue->hard, nlh->nlmsg_pid); |
| 1962 | |
| 1963 | if (ue->hard) { |
| 1964 | uid_t loginuid = audit_get_loginuid(current); |
| 1965 | u32 sessionid = audit_get_sessionid(current); |
| 1966 | u32 sid; |
| 1967 | |
| 1968 | security_task_getsecid(current, &sid); |
| 1969 | __xfrm_state_delete(x); |
| 1970 | xfrm_audit_state_delete(x, 1, loginuid, sessionid, sid); |
| 1971 | } |
| 1972 | err = 0; |
| 1973 | out: |
| 1974 | spin_unlock_bh(&x->lock); |
| 1975 | xfrm_state_put(x); |
| 1976 | return err; |
| 1977 | } |
| 1978 | |
| 1979 | static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh, |
| 1980 | struct nlattr **attrs) |
| 1981 | { |
| 1982 | struct net *net = sock_net(skb->sk); |
| 1983 | struct xfrm_policy *xp; |
| 1984 | struct xfrm_user_tmpl *ut; |
| 1985 | int i; |
| 1986 | struct nlattr *rt = attrs[XFRMA_TMPL]; |
| 1987 | struct xfrm_mark mark; |
| 1988 | |
| 1989 | struct xfrm_user_acquire *ua = nlmsg_data(nlh); |
| 1990 | struct xfrm_state *x = xfrm_state_alloc(net); |
| 1991 | int err = -ENOMEM; |
| 1992 | |
| 1993 | if (!x) |
| 1994 | goto nomem; |
| 1995 | |
| 1996 | xfrm_mark_get(attrs, &mark); |
| 1997 | |
| 1998 | err = verify_newpolicy_info(&ua->policy); |
| 1999 | if (err) |
| 2000 | goto bad_policy; |
| 2001 | |
| 2002 | /* build an XP */ |
| 2003 | xp = xfrm_policy_construct(net, &ua->policy, attrs, &err); |
| 2004 | if (!xp) |
| 2005 | goto free_state; |
| 2006 | |
| 2007 | memcpy(&x->id, &ua->id, sizeof(ua->id)); |
| 2008 | memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr)); |
| 2009 | memcpy(&x->sel, &ua->sel, sizeof(ua->sel)); |
| 2010 | xp->mark.m = x->mark.m = mark.m; |
| 2011 | xp->mark.v = x->mark.v = mark.v; |
| 2012 | ut = nla_data(rt); |
| 2013 | /* extract the templates and for each call km_key */ |
| 2014 | for (i = 0; i < xp->xfrm_nr; i++, ut++) { |
| 2015 | struct xfrm_tmpl *t = &xp->xfrm_vec[i]; |
| 2016 | memcpy(&x->id, &t->id, sizeof(x->id)); |
| 2017 | x->props.mode = t->mode; |
| 2018 | x->props.reqid = t->reqid; |
| 2019 | x->props.family = ut->family; |
| 2020 | t->aalgos = ua->aalgos; |
| 2021 | t->ealgos = ua->ealgos; |
| 2022 | t->calgos = ua->calgos; |
| 2023 | err = km_query(x, t, xp); |
| 2024 | |
| 2025 | } |
| 2026 | |
| 2027 | kfree(x); |
| 2028 | kfree(xp); |
| 2029 | |
| 2030 | return 0; |
| 2031 | |
| 2032 | bad_policy: |
| 2033 | WARN(1, "BAD policy passed\n"); |
| 2034 | free_state: |
| 2035 | kfree(x); |
| 2036 | nomem: |
| 2037 | return err; |
| 2038 | } |
| 2039 | |
| 2040 | #ifdef CONFIG_XFRM_MIGRATE |
| 2041 | static int copy_from_user_migrate(struct xfrm_migrate *ma, |
| 2042 | struct xfrm_kmaddress *k, |
| 2043 | struct nlattr **attrs, int *num) |
| 2044 | { |
| 2045 | struct nlattr *rt = attrs[XFRMA_MIGRATE]; |
| 2046 | struct xfrm_user_migrate *um; |
| 2047 | int i, num_migrate; |
| 2048 | |
| 2049 | if (k != NULL) { |
| 2050 | struct xfrm_user_kmaddress *uk; |
| 2051 | |
| 2052 | uk = nla_data(attrs[XFRMA_KMADDRESS]); |
| 2053 | memcpy(&k->local, &uk->local, sizeof(k->local)); |
| 2054 | memcpy(&k->remote, &uk->remote, sizeof(k->remote)); |
| 2055 | k->family = uk->family; |
| 2056 | k->reserved = uk->reserved; |
| 2057 | } |
| 2058 | |
| 2059 | um = nla_data(rt); |
| 2060 | num_migrate = nla_len(rt) / sizeof(*um); |
| 2061 | |
| 2062 | if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH) |
| 2063 | return -EINVAL; |
| 2064 | |
| 2065 | for (i = 0; i < num_migrate; i++, um++, ma++) { |
| 2066 | memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr)); |
| 2067 | memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr)); |
| 2068 | memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr)); |
| 2069 | memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr)); |
| 2070 | |
| 2071 | ma->proto = um->proto; |
| 2072 | ma->mode = um->mode; |
| 2073 | ma->reqid = um->reqid; |
| 2074 | |
| 2075 | ma->old_family = um->old_family; |
| 2076 | ma->new_family = um->new_family; |
| 2077 | } |
| 2078 | |
| 2079 | *num = i; |
| 2080 | return 0; |
| 2081 | } |
| 2082 | |
| 2083 | static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh, |
| 2084 | struct nlattr **attrs) |
| 2085 | { |
| 2086 | struct xfrm_userpolicy_id *pi = nlmsg_data(nlh); |
| 2087 | struct xfrm_migrate m[XFRM_MAX_DEPTH]; |
| 2088 | struct xfrm_kmaddress km, *kmp; |
| 2089 | u8 type; |
| 2090 | int err; |
| 2091 | int n = 0; |
| 2092 | |
| 2093 | if (attrs[XFRMA_MIGRATE] == NULL) |
| 2094 | return -EINVAL; |
| 2095 | |
| 2096 | kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL; |
| 2097 | |
| 2098 | err = copy_from_user_policy_type(&type, attrs); |
| 2099 | if (err) |
| 2100 | return err; |
| 2101 | |
| 2102 | err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n); |
| 2103 | if (err) |
| 2104 | return err; |
| 2105 | |
| 2106 | if (!n) |
| 2107 | return 0; |
| 2108 | |
| 2109 | xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp); |
| 2110 | |
| 2111 | return 0; |
| 2112 | } |
| 2113 | #else |
| 2114 | static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh, |
| 2115 | struct nlattr **attrs) |
| 2116 | { |
| 2117 | return -ENOPROTOOPT; |
| 2118 | } |
| 2119 | #endif |
| 2120 | |
| 2121 | #ifdef CONFIG_XFRM_MIGRATE |
| 2122 | static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb) |
| 2123 | { |
| 2124 | struct xfrm_user_migrate um; |
| 2125 | |
| 2126 | memset(&um, 0, sizeof(um)); |
| 2127 | um.proto = m->proto; |
| 2128 | um.mode = m->mode; |
| 2129 | um.reqid = m->reqid; |
| 2130 | um.old_family = m->old_family; |
| 2131 | memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr)); |
| 2132 | memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr)); |
| 2133 | um.new_family = m->new_family; |
| 2134 | memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr)); |
| 2135 | memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr)); |
| 2136 | |
| 2137 | return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um); |
| 2138 | } |
| 2139 | |
| 2140 | static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb) |
| 2141 | { |
| 2142 | struct xfrm_user_kmaddress uk; |
| 2143 | |
| 2144 | memset(&uk, 0, sizeof(uk)); |
| 2145 | uk.family = k->family; |
| 2146 | uk.reserved = k->reserved; |
| 2147 | memcpy(&uk.local, &k->local, sizeof(uk.local)); |
| 2148 | memcpy(&uk.remote, &k->remote, sizeof(uk.remote)); |
| 2149 | |
| 2150 | return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk); |
| 2151 | } |
| 2152 | |
| 2153 | static inline size_t xfrm_migrate_msgsize(int num_migrate, int with_kma) |
| 2154 | { |
| 2155 | return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id)) |
| 2156 | + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0) |
| 2157 | + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate) |
| 2158 | + userpolicy_type_attrsize(); |
| 2159 | } |
| 2160 | |
| 2161 | static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m, |
| 2162 | int num_migrate, const struct xfrm_kmaddress *k, |
| 2163 | const struct xfrm_selector *sel, u8 dir, u8 type) |
| 2164 | { |
| 2165 | const struct xfrm_migrate *mp; |
| 2166 | struct xfrm_userpolicy_id *pol_id; |
| 2167 | struct nlmsghdr *nlh; |
| 2168 | int i, err; |
| 2169 | |
| 2170 | nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0); |
| 2171 | if (nlh == NULL) |
| 2172 | return -EMSGSIZE; |
| 2173 | |
| 2174 | pol_id = nlmsg_data(nlh); |
| 2175 | /* copy data from selector, dir, and type to the pol_id */ |
| 2176 | memset(pol_id, 0, sizeof(*pol_id)); |
| 2177 | memcpy(&pol_id->sel, sel, sizeof(pol_id->sel)); |
| 2178 | pol_id->dir = dir; |
| 2179 | |
| 2180 | if (k != NULL) { |
| 2181 | err = copy_to_user_kmaddress(k, skb); |
| 2182 | if (err) |
| 2183 | goto out_cancel; |
| 2184 | } |
| 2185 | err = copy_to_user_policy_type(type, skb); |
| 2186 | if (err) |
| 2187 | goto out_cancel; |
| 2188 | for (i = 0, mp = m ; i < num_migrate; i++, mp++) { |
| 2189 | err = copy_to_user_migrate(mp, skb); |
| 2190 | if (err) |
| 2191 | goto out_cancel; |
| 2192 | } |
| 2193 | |
| 2194 | return nlmsg_end(skb, nlh); |
| 2195 | |
| 2196 | out_cancel: |
| 2197 | nlmsg_cancel(skb, nlh); |
| 2198 | return err; |
| 2199 | } |
| 2200 | |
| 2201 | static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, |
| 2202 | const struct xfrm_migrate *m, int num_migrate, |
| 2203 | const struct xfrm_kmaddress *k) |
| 2204 | { |
| 2205 | struct net *net = &init_net; |
| 2206 | struct sk_buff *skb; |
| 2207 | |
| 2208 | skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k), GFP_ATOMIC); |
| 2209 | if (skb == NULL) |
| 2210 | return -ENOMEM; |
| 2211 | |
| 2212 | /* build migrate */ |
| 2213 | if (build_migrate(skb, m, num_migrate, k, sel, dir, type) < 0) |
| 2214 | BUG(); |
| 2215 | |
| 2216 | return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MIGRATE, GFP_ATOMIC); |
| 2217 | } |
| 2218 | #else |
| 2219 | static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, |
| 2220 | const struct xfrm_migrate *m, int num_migrate, |
| 2221 | const struct xfrm_kmaddress *k) |
| 2222 | { |
| 2223 | return -ENOPROTOOPT; |
| 2224 | } |
| 2225 | #endif |
| 2226 | |
| 2227 | #define XMSGSIZE(type) sizeof(struct type) |
| 2228 | |
| 2229 | static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = { |
| 2230 | [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), |
| 2231 | [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), |
| 2232 | [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), |
| 2233 | [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), |
| 2234 | [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), |
| 2235 | [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), |
| 2236 | [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info), |
| 2237 | [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire), |
| 2238 | [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire), |
| 2239 | [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), |
| 2240 | [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), |
| 2241 | [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire), |
| 2242 | [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush), |
| 2243 | [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0, |
| 2244 | [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), |
| 2245 | [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), |
| 2246 | [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report), |
| 2247 | [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), |
| 2248 | [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32), |
| 2249 | [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32), |
| 2250 | }; |
| 2251 | |
| 2252 | #undef XMSGSIZE |
| 2253 | |
| 2254 | static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = { |
| 2255 | [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)}, |
| 2256 | [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)}, |
| 2257 | [XFRMA_LASTUSED] = { .type = NLA_U64}, |
| 2258 | [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)}, |
| 2259 | [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) }, |
| 2260 | [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) }, |
| 2261 | [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) }, |
| 2262 | [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) }, |
| 2263 | [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) }, |
| 2264 | [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) }, |
| 2265 | [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) }, |
| 2266 | [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) }, |
| 2267 | [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) }, |
| 2268 | [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 }, |
| 2269 | [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 }, |
| 2270 | [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) }, |
| 2271 | [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) }, |
| 2272 | [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)}, |
| 2273 | [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) }, |
| 2274 | [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) }, |
| 2275 | [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) }, |
| 2276 | [XFRMA_TFCPAD] = { .type = NLA_U32 }, |
| 2277 | [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) }, |
| 2278 | }; |
| 2279 | |
| 2280 | static struct xfrm_link { |
| 2281 | int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **); |
| 2282 | int (*dump)(struct sk_buff *, struct netlink_callback *); |
| 2283 | int (*done)(struct netlink_callback *); |
| 2284 | } xfrm_dispatch[XFRM_NR_MSGTYPES] = { |
| 2285 | [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, |
| 2286 | [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa }, |
| 2287 | [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa, |
| 2288 | .dump = xfrm_dump_sa, |
| 2289 | .done = xfrm_dump_sa_done }, |
| 2290 | [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, |
| 2291 | [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy }, |
| 2292 | [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy, |
| 2293 | .dump = xfrm_dump_policy, |
| 2294 | .done = xfrm_dump_policy_done }, |
| 2295 | [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi }, |
| 2296 | [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire }, |
| 2297 | [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire }, |
| 2298 | [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, |
| 2299 | [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, |
| 2300 | [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire}, |
| 2301 | [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa }, |
| 2302 | [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy }, |
| 2303 | [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae }, |
| 2304 | [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae }, |
| 2305 | [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate }, |
| 2306 | [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo }, |
| 2307 | [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo }, |
| 2308 | }; |
| 2309 | |
| 2310 | static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) |
| 2311 | { |
| 2312 | struct net *net = sock_net(skb->sk); |
| 2313 | struct nlattr *attrs[XFRMA_MAX+1]; |
| 2314 | struct xfrm_link *link; |
| 2315 | int type, err; |
| 2316 | |
| 2317 | type = nlh->nlmsg_type; |
| 2318 | if (type > XFRM_MSG_MAX) |
| 2319 | return -EINVAL; |
| 2320 | |
| 2321 | type -= XFRM_MSG_BASE; |
| 2322 | link = &xfrm_dispatch[type]; |
| 2323 | |
| 2324 | /* All operations require privileges, even GET */ |
| 2325 | if (!capable(CAP_NET_ADMIN)) |
| 2326 | return -EPERM; |
| 2327 | |
| 2328 | if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) || |
| 2329 | type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) && |
| 2330 | (nlh->nlmsg_flags & NLM_F_DUMP)) { |
| 2331 | if (link->dump == NULL) |
| 2332 | return -EINVAL; |
| 2333 | |
| 2334 | { |
| 2335 | struct netlink_dump_control c = { |
| 2336 | .dump = link->dump, |
| 2337 | .done = link->done, |
| 2338 | }; |
| 2339 | return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c); |
| 2340 | } |
| 2341 | } |
| 2342 | |
| 2343 | err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs, XFRMA_MAX, |
| 2344 | xfrma_policy); |
| 2345 | if (err < 0) |
| 2346 | return err; |
| 2347 | |
| 2348 | if (link->doit == NULL) |
| 2349 | return -EINVAL; |
| 2350 | |
| 2351 | return link->doit(skb, nlh, attrs); |
| 2352 | } |
| 2353 | |
| 2354 | static void xfrm_netlink_rcv(struct sk_buff *skb) |
| 2355 | { |
| 2356 | mutex_lock(&xfrm_cfg_mutex); |
| 2357 | netlink_rcv_skb(skb, &xfrm_user_rcv_msg); |
| 2358 | mutex_unlock(&xfrm_cfg_mutex); |
| 2359 | } |
| 2360 | |
| 2361 | static inline size_t xfrm_expire_msgsize(void) |
| 2362 | { |
| 2363 | return NLMSG_ALIGN(sizeof(struct xfrm_user_expire)) |
| 2364 | + nla_total_size(sizeof(struct xfrm_mark)); |
| 2365 | } |
| 2366 | |
| 2367 | static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c) |
| 2368 | { |
| 2369 | struct xfrm_user_expire *ue; |
| 2370 | struct nlmsghdr *nlh; |
| 2371 | int err; |
| 2372 | |
| 2373 | nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0); |
| 2374 | if (nlh == NULL) |
| 2375 | return -EMSGSIZE; |
| 2376 | |
| 2377 | ue = nlmsg_data(nlh); |
| 2378 | copy_to_user_state(x, &ue->state); |
| 2379 | ue->hard = (c->data.hard != 0) ? 1 : 0; |
| 2380 | |
| 2381 | err = xfrm_mark_put(skb, &x->mark); |
| 2382 | if (err) |
| 2383 | return err; |
| 2384 | |
| 2385 | return nlmsg_end(skb, nlh); |
| 2386 | } |
| 2387 | |
| 2388 | static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c) |
| 2389 | { |
| 2390 | struct net *net = xs_net(x); |
| 2391 | struct sk_buff *skb; |
| 2392 | |
| 2393 | skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC); |
| 2394 | if (skb == NULL) |
| 2395 | return -ENOMEM; |
| 2396 | |
| 2397 | if (build_expire(skb, x, c) < 0) { |
| 2398 | kfree_skb(skb); |
| 2399 | return -EMSGSIZE; |
| 2400 | } |
| 2401 | |
| 2402 | return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC); |
| 2403 | } |
| 2404 | |
| 2405 | static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c) |
| 2406 | { |
| 2407 | struct net *net = xs_net(x); |
| 2408 | struct sk_buff *skb; |
| 2409 | |
| 2410 | skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC); |
| 2411 | if (skb == NULL) |
| 2412 | return -ENOMEM; |
| 2413 | |
| 2414 | if (build_aevent(skb, x, c) < 0) |
| 2415 | BUG(); |
| 2416 | |
| 2417 | return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_AEVENTS, GFP_ATOMIC); |
| 2418 | } |
| 2419 | |
| 2420 | static int xfrm_notify_sa_flush(const struct km_event *c) |
| 2421 | { |
| 2422 | struct net *net = c->net; |
| 2423 | struct xfrm_usersa_flush *p; |
| 2424 | struct nlmsghdr *nlh; |
| 2425 | struct sk_buff *skb; |
| 2426 | int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush)); |
| 2427 | |
| 2428 | skb = nlmsg_new(len, GFP_ATOMIC); |
| 2429 | if (skb == NULL) |
| 2430 | return -ENOMEM; |
| 2431 | |
| 2432 | nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0); |
| 2433 | if (nlh == NULL) { |
| 2434 | kfree_skb(skb); |
| 2435 | return -EMSGSIZE; |
| 2436 | } |
| 2437 | |
| 2438 | p = nlmsg_data(nlh); |
| 2439 | p->proto = c->data.proto; |
| 2440 | |
| 2441 | nlmsg_end(skb, nlh); |
| 2442 | |
| 2443 | return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC); |
| 2444 | } |
| 2445 | |
| 2446 | static inline size_t xfrm_sa_len(struct xfrm_state *x) |
| 2447 | { |
| 2448 | size_t l = 0; |
| 2449 | if (x->aead) |
| 2450 | l += nla_total_size(aead_len(x->aead)); |
| 2451 | if (x->aalg) { |
| 2452 | l += nla_total_size(sizeof(struct xfrm_algo) + |
| 2453 | (x->aalg->alg_key_len + 7) / 8); |
| 2454 | l += nla_total_size(xfrm_alg_auth_len(x->aalg)); |
| 2455 | } |
| 2456 | if (x->ealg) |
| 2457 | l += nla_total_size(xfrm_alg_len(x->ealg)); |
| 2458 | if (x->calg) |
| 2459 | l += nla_total_size(sizeof(*x->calg)); |
| 2460 | if (x->encap) |
| 2461 | l += nla_total_size(sizeof(*x->encap)); |
| 2462 | if (x->tfcpad) |
| 2463 | l += nla_total_size(sizeof(x->tfcpad)); |
| 2464 | if (x->replay_esn) |
| 2465 | l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn)); |
| 2466 | if (x->security) |
| 2467 | l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) + |
| 2468 | x->security->ctx_len); |
| 2469 | if (x->coaddr) |
| 2470 | l += nla_total_size(sizeof(*x->coaddr)); |
| 2471 | |
| 2472 | /* Must count x->lastused as it may become non-zero behind our back. */ |
| 2473 | l += nla_total_size(sizeof(u64)); |
| 2474 | |
| 2475 | return l; |
| 2476 | } |
| 2477 | |
| 2478 | static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c) |
| 2479 | { |
| 2480 | struct net *net = xs_net(x); |
| 2481 | struct xfrm_usersa_info *p; |
| 2482 | struct xfrm_usersa_id *id; |
| 2483 | struct nlmsghdr *nlh; |
| 2484 | struct sk_buff *skb; |
| 2485 | int len = xfrm_sa_len(x); |
| 2486 | int headlen, err; |
| 2487 | |
| 2488 | headlen = sizeof(*p); |
| 2489 | if (c->event == XFRM_MSG_DELSA) { |
| 2490 | len += nla_total_size(headlen); |
| 2491 | headlen = sizeof(*id); |
| 2492 | len += nla_total_size(sizeof(struct xfrm_mark)); |
| 2493 | } |
| 2494 | len += NLMSG_ALIGN(headlen); |
| 2495 | |
| 2496 | skb = nlmsg_new(len, GFP_ATOMIC); |
| 2497 | if (skb == NULL) |
| 2498 | return -ENOMEM; |
| 2499 | |
| 2500 | nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0); |
| 2501 | err = -EMSGSIZE; |
| 2502 | if (nlh == NULL) |
| 2503 | goto out_free_skb; |
| 2504 | |
| 2505 | p = nlmsg_data(nlh); |
| 2506 | if (c->event == XFRM_MSG_DELSA) { |
| 2507 | struct nlattr *attr; |
| 2508 | |
| 2509 | id = nlmsg_data(nlh); |
| 2510 | memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr)); |
| 2511 | id->spi = x->id.spi; |
| 2512 | id->family = x->props.family; |
| 2513 | id->proto = x->id.proto; |
| 2514 | |
| 2515 | attr = nla_reserve(skb, XFRMA_SA, sizeof(*p)); |
| 2516 | err = -EMSGSIZE; |
| 2517 | if (attr == NULL) |
| 2518 | goto out_free_skb; |
| 2519 | |
| 2520 | p = nla_data(attr); |
| 2521 | } |
| 2522 | err = copy_to_user_state_extra(x, p, skb); |
| 2523 | if (err) |
| 2524 | goto out_free_skb; |
| 2525 | |
| 2526 | nlmsg_end(skb, nlh); |
| 2527 | |
| 2528 | return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC); |
| 2529 | |
| 2530 | out_free_skb: |
| 2531 | kfree_skb(skb); |
| 2532 | return err; |
| 2533 | } |
| 2534 | |
| 2535 | static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c) |
| 2536 | { |
| 2537 | |
| 2538 | switch (c->event) { |
| 2539 | case XFRM_MSG_EXPIRE: |
| 2540 | return xfrm_exp_state_notify(x, c); |
| 2541 | case XFRM_MSG_NEWAE: |
| 2542 | return xfrm_aevent_state_notify(x, c); |
| 2543 | case XFRM_MSG_DELSA: |
| 2544 | case XFRM_MSG_UPDSA: |
| 2545 | case XFRM_MSG_NEWSA: |
| 2546 | return xfrm_notify_sa(x, c); |
| 2547 | case XFRM_MSG_FLUSHSA: |
| 2548 | return xfrm_notify_sa_flush(c); |
| 2549 | default: |
| 2550 | printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n", |
| 2551 | c->event); |
| 2552 | break; |
| 2553 | } |
| 2554 | |
| 2555 | return 0; |
| 2556 | |
| 2557 | } |
| 2558 | |
| 2559 | static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x, |
| 2560 | struct xfrm_policy *xp) |
| 2561 | { |
| 2562 | return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire)) |
| 2563 | + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr) |
| 2564 | + nla_total_size(sizeof(struct xfrm_mark)) |
| 2565 | + nla_total_size(xfrm_user_sec_ctx_size(x->security)) |
| 2566 | + userpolicy_type_attrsize(); |
| 2567 | } |
| 2568 | |
| 2569 | static int build_acquire(struct sk_buff *skb, struct xfrm_state *x, |
| 2570 | struct xfrm_tmpl *xt, struct xfrm_policy *xp) |
| 2571 | { |
| 2572 | __u32 seq = xfrm_get_acqseq(); |
| 2573 | struct xfrm_user_acquire *ua; |
| 2574 | struct nlmsghdr *nlh; |
| 2575 | int err; |
| 2576 | |
| 2577 | nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0); |
| 2578 | if (nlh == NULL) |
| 2579 | return -EMSGSIZE; |
| 2580 | |
| 2581 | ua = nlmsg_data(nlh); |
| 2582 | memcpy(&ua->id, &x->id, sizeof(ua->id)); |
| 2583 | memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr)); |
| 2584 | memcpy(&ua->sel, &x->sel, sizeof(ua->sel)); |
| 2585 | copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT); |
| 2586 | ua->aalgos = xt->aalgos; |
| 2587 | ua->ealgos = xt->ealgos; |
| 2588 | ua->calgos = xt->calgos; |
| 2589 | ua->seq = x->km.seq = seq; |
| 2590 | |
| 2591 | err = copy_to_user_tmpl(xp, skb); |
| 2592 | if (!err) |
| 2593 | err = copy_to_user_state_sec_ctx(x, skb); |
| 2594 | if (!err) |
| 2595 | err = copy_to_user_policy_type(xp->type, skb); |
| 2596 | if (!err) |
| 2597 | err = xfrm_mark_put(skb, &xp->mark); |
| 2598 | if (err) { |
| 2599 | nlmsg_cancel(skb, nlh); |
| 2600 | return err; |
| 2601 | } |
| 2602 | |
| 2603 | return nlmsg_end(skb, nlh); |
| 2604 | } |
| 2605 | |
| 2606 | static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt, |
| 2607 | struct xfrm_policy *xp) |
| 2608 | { |
| 2609 | struct net *net = xs_net(x); |
| 2610 | struct sk_buff *skb; |
| 2611 | |
| 2612 | skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC); |
| 2613 | if (skb == NULL) |
| 2614 | return -ENOMEM; |
| 2615 | |
| 2616 | if (build_acquire(skb, x, xt, xp) < 0) |
| 2617 | BUG(); |
| 2618 | |
| 2619 | return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_ACQUIRE, GFP_ATOMIC); |
| 2620 | } |
| 2621 | |
| 2622 | /* User gives us xfrm_user_policy_info followed by an array of 0 |
| 2623 | * or more templates. |
| 2624 | */ |
| 2625 | static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt, |
| 2626 | u8 *data, int len, int *dir) |
| 2627 | { |
| 2628 | struct net *net = sock_net(sk); |
| 2629 | struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data; |
| 2630 | struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1); |
| 2631 | struct xfrm_policy *xp; |
| 2632 | int nr; |
| 2633 | |
| 2634 | switch (sk->sk_family) { |
| 2635 | case AF_INET: |
| 2636 | if (opt != IP_XFRM_POLICY) { |
| 2637 | *dir = -EOPNOTSUPP; |
| 2638 | return NULL; |
| 2639 | } |
| 2640 | break; |
| 2641 | #if IS_ENABLED(CONFIG_IPV6) |
| 2642 | case AF_INET6: |
| 2643 | if (opt != IPV6_XFRM_POLICY) { |
| 2644 | *dir = -EOPNOTSUPP; |
| 2645 | return NULL; |
| 2646 | } |
| 2647 | break; |
| 2648 | #endif |
| 2649 | default: |
| 2650 | *dir = -EINVAL; |
| 2651 | return NULL; |
| 2652 | } |
| 2653 | |
| 2654 | *dir = -EINVAL; |
| 2655 | |
| 2656 | if (len < sizeof(*p) || |
| 2657 | verify_newpolicy_info(p)) |
| 2658 | return NULL; |
| 2659 | |
| 2660 | nr = ((len - sizeof(*p)) / sizeof(*ut)); |
| 2661 | if (validate_tmpl(nr, ut, p->sel.family)) |
| 2662 | return NULL; |
| 2663 | |
| 2664 | if (p->dir > XFRM_POLICY_OUT) |
| 2665 | return NULL; |
| 2666 | |
| 2667 | xp = xfrm_policy_alloc(net, GFP_ATOMIC); |
| 2668 | if (xp == NULL) { |
| 2669 | *dir = -ENOBUFS; |
| 2670 | return NULL; |
| 2671 | } |
| 2672 | |
| 2673 | copy_from_user_policy(xp, p); |
| 2674 | xp->type = XFRM_POLICY_TYPE_MAIN; |
| 2675 | copy_templates(xp, ut, nr); |
| 2676 | |
| 2677 | *dir = p->dir; |
| 2678 | |
| 2679 | return xp; |
| 2680 | } |
| 2681 | |
| 2682 | static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp) |
| 2683 | { |
| 2684 | return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire)) |
| 2685 | + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr) |
| 2686 | + nla_total_size(xfrm_user_sec_ctx_size(xp->security)) |
| 2687 | + nla_total_size(sizeof(struct xfrm_mark)) |
| 2688 | + userpolicy_type_attrsize(); |
| 2689 | } |
| 2690 | |
| 2691 | static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp, |
| 2692 | int dir, const struct km_event *c) |
| 2693 | { |
| 2694 | struct xfrm_user_polexpire *upe; |
| 2695 | int hard = c->data.hard; |
| 2696 | struct nlmsghdr *nlh; |
| 2697 | int err; |
| 2698 | |
| 2699 | nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0); |
| 2700 | if (nlh == NULL) |
| 2701 | return -EMSGSIZE; |
| 2702 | |
| 2703 | upe = nlmsg_data(nlh); |
| 2704 | copy_to_user_policy(xp, &upe->pol, dir); |
| 2705 | err = copy_to_user_tmpl(xp, skb); |
| 2706 | if (!err) |
| 2707 | err = copy_to_user_sec_ctx(xp, skb); |
| 2708 | if (!err) |
| 2709 | err = copy_to_user_policy_type(xp->type, skb); |
| 2710 | if (!err) |
| 2711 | err = xfrm_mark_put(skb, &xp->mark); |
| 2712 | if (err) { |
| 2713 | nlmsg_cancel(skb, nlh); |
| 2714 | return err; |
| 2715 | } |
| 2716 | upe->hard = !!hard; |
| 2717 | |
| 2718 | return nlmsg_end(skb, nlh); |
| 2719 | } |
| 2720 | |
| 2721 | static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) |
| 2722 | { |
| 2723 | struct net *net = xp_net(xp); |
| 2724 | struct sk_buff *skb; |
| 2725 | |
| 2726 | skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC); |
| 2727 | if (skb == NULL) |
| 2728 | return -ENOMEM; |
| 2729 | |
| 2730 | if (build_polexpire(skb, xp, dir, c) < 0) |
| 2731 | BUG(); |
| 2732 | |
| 2733 | return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC); |
| 2734 | } |
| 2735 | |
| 2736 | static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c) |
| 2737 | { |
| 2738 | int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr); |
| 2739 | struct net *net = xp_net(xp); |
| 2740 | struct xfrm_userpolicy_info *p; |
| 2741 | struct xfrm_userpolicy_id *id; |
| 2742 | struct nlmsghdr *nlh; |
| 2743 | struct sk_buff *skb; |
| 2744 | int headlen, err; |
| 2745 | |
| 2746 | headlen = sizeof(*p); |
| 2747 | if (c->event == XFRM_MSG_DELPOLICY) { |
| 2748 | len += nla_total_size(headlen); |
| 2749 | headlen = sizeof(*id); |
| 2750 | } |
| 2751 | len += userpolicy_type_attrsize(); |
| 2752 | len += nla_total_size(sizeof(struct xfrm_mark)); |
| 2753 | len += NLMSG_ALIGN(headlen); |
| 2754 | |
| 2755 | skb = nlmsg_new(len, GFP_ATOMIC); |
| 2756 | if (skb == NULL) |
| 2757 | return -ENOMEM; |
| 2758 | |
| 2759 | nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0); |
| 2760 | err = -EMSGSIZE; |
| 2761 | if (nlh == NULL) |
| 2762 | goto out_free_skb; |
| 2763 | |
| 2764 | p = nlmsg_data(nlh); |
| 2765 | if (c->event == XFRM_MSG_DELPOLICY) { |
| 2766 | struct nlattr *attr; |
| 2767 | |
| 2768 | id = nlmsg_data(nlh); |
| 2769 | memset(id, 0, sizeof(*id)); |
| 2770 | id->dir = dir; |
| 2771 | if (c->data.byid) |
| 2772 | id->index = xp->index; |
| 2773 | else |
| 2774 | memcpy(&id->sel, &xp->selector, sizeof(id->sel)); |
| 2775 | |
| 2776 | attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p)); |
| 2777 | err = -EMSGSIZE; |
| 2778 | if (attr == NULL) |
| 2779 | goto out_free_skb; |
| 2780 | |
| 2781 | p = nla_data(attr); |
| 2782 | } |
| 2783 | |
| 2784 | copy_to_user_policy(xp, p, dir); |
| 2785 | err = copy_to_user_tmpl(xp, skb); |
| 2786 | if (!err) |
| 2787 | err = copy_to_user_policy_type(xp->type, skb); |
| 2788 | if (!err) |
| 2789 | err = xfrm_mark_put(skb, &xp->mark); |
| 2790 | if (err) |
| 2791 | goto out_free_skb; |
| 2792 | |
| 2793 | nlmsg_end(skb, nlh); |
| 2794 | |
| 2795 | return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC); |
| 2796 | |
| 2797 | out_free_skb: |
| 2798 | kfree_skb(skb); |
| 2799 | return err; |
| 2800 | } |
| 2801 | |
| 2802 | static int xfrm_notify_policy_flush(const struct km_event *c) |
| 2803 | { |
| 2804 | struct net *net = c->net; |
| 2805 | struct nlmsghdr *nlh; |
| 2806 | struct sk_buff *skb; |
| 2807 | int err; |
| 2808 | |
| 2809 | skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC); |
| 2810 | if (skb == NULL) |
| 2811 | return -ENOMEM; |
| 2812 | |
| 2813 | nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0); |
| 2814 | err = -EMSGSIZE; |
| 2815 | if (nlh == NULL) |
| 2816 | goto out_free_skb; |
| 2817 | err = copy_to_user_policy_type(c->data.type, skb); |
| 2818 | if (err) |
| 2819 | goto out_free_skb; |
| 2820 | |
| 2821 | nlmsg_end(skb, nlh); |
| 2822 | |
| 2823 | return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC); |
| 2824 | |
| 2825 | out_free_skb: |
| 2826 | kfree_skb(skb); |
| 2827 | return err; |
| 2828 | } |
| 2829 | |
| 2830 | static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) |
| 2831 | { |
| 2832 | |
| 2833 | switch (c->event) { |
| 2834 | case XFRM_MSG_NEWPOLICY: |
| 2835 | case XFRM_MSG_UPDPOLICY: |
| 2836 | case XFRM_MSG_DELPOLICY: |
| 2837 | return xfrm_notify_policy(xp, dir, c); |
| 2838 | case XFRM_MSG_FLUSHPOLICY: |
| 2839 | return xfrm_notify_policy_flush(c); |
| 2840 | case XFRM_MSG_POLEXPIRE: |
| 2841 | return xfrm_exp_policy_notify(xp, dir, c); |
| 2842 | default: |
| 2843 | printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n", |
| 2844 | c->event); |
| 2845 | } |
| 2846 | |
| 2847 | return 0; |
| 2848 | |
| 2849 | } |
| 2850 | |
| 2851 | static inline size_t xfrm_report_msgsize(void) |
| 2852 | { |
| 2853 | return NLMSG_ALIGN(sizeof(struct xfrm_user_report)); |
| 2854 | } |
| 2855 | |
| 2856 | static int build_report(struct sk_buff *skb, u8 proto, |
| 2857 | struct xfrm_selector *sel, xfrm_address_t *addr) |
| 2858 | { |
| 2859 | struct xfrm_user_report *ur; |
| 2860 | struct nlmsghdr *nlh; |
| 2861 | |
| 2862 | nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0); |
| 2863 | if (nlh == NULL) |
| 2864 | return -EMSGSIZE; |
| 2865 | |
| 2866 | ur = nlmsg_data(nlh); |
| 2867 | ur->proto = proto; |
| 2868 | memcpy(&ur->sel, sel, sizeof(ur->sel)); |
| 2869 | |
| 2870 | if (addr) { |
| 2871 | int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr); |
| 2872 | if (err) { |
| 2873 | nlmsg_cancel(skb, nlh); |
| 2874 | return err; |
| 2875 | } |
| 2876 | } |
| 2877 | return nlmsg_end(skb, nlh); |
| 2878 | } |
| 2879 | |
| 2880 | static int xfrm_send_report(struct net *net, u8 proto, |
| 2881 | struct xfrm_selector *sel, xfrm_address_t *addr) |
| 2882 | { |
| 2883 | struct sk_buff *skb; |
| 2884 | |
| 2885 | skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC); |
| 2886 | if (skb == NULL) |
| 2887 | return -ENOMEM; |
| 2888 | |
| 2889 | if (build_report(skb, proto, sel, addr) < 0) |
| 2890 | BUG(); |
| 2891 | |
| 2892 | return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_REPORT, GFP_ATOMIC); |
| 2893 | } |
| 2894 | |
| 2895 | static inline size_t xfrm_mapping_msgsize(void) |
| 2896 | { |
| 2897 | return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping)); |
| 2898 | } |
| 2899 | |
| 2900 | static int build_mapping(struct sk_buff *skb, struct xfrm_state *x, |
| 2901 | xfrm_address_t *new_saddr, __be16 new_sport) |
| 2902 | { |
| 2903 | struct xfrm_user_mapping *um; |
| 2904 | struct nlmsghdr *nlh; |
| 2905 | |
| 2906 | nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0); |
| 2907 | if (nlh == NULL) |
| 2908 | return -EMSGSIZE; |
| 2909 | |
| 2910 | um = nlmsg_data(nlh); |
| 2911 | |
| 2912 | memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr)); |
| 2913 | um->id.spi = x->id.spi; |
| 2914 | um->id.family = x->props.family; |
| 2915 | um->id.proto = x->id.proto; |
| 2916 | memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr)); |
| 2917 | memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr)); |
| 2918 | um->new_sport = new_sport; |
| 2919 | um->old_sport = x->encap->encap_sport; |
| 2920 | um->reqid = x->props.reqid; |
| 2921 | |
| 2922 | return nlmsg_end(skb, nlh); |
| 2923 | } |
| 2924 | |
| 2925 | static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, |
| 2926 | __be16 sport) |
| 2927 | { |
| 2928 | struct net *net = xs_net(x); |
| 2929 | struct sk_buff *skb; |
| 2930 | |
| 2931 | if (x->id.proto != IPPROTO_ESP) |
| 2932 | return -EINVAL; |
| 2933 | |
| 2934 | if (!x->encap) |
| 2935 | return -EINVAL; |
| 2936 | |
| 2937 | skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC); |
| 2938 | if (skb == NULL) |
| 2939 | return -ENOMEM; |
| 2940 | |
| 2941 | if (build_mapping(skb, x, ipaddr, sport) < 0) |
| 2942 | BUG(); |
| 2943 | |
| 2944 | return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MAPPING, GFP_ATOMIC); |
| 2945 | } |
| 2946 | |
| 2947 | static struct xfrm_mgr netlink_mgr = { |
| 2948 | .id = "netlink", |
| 2949 | .notify = xfrm_send_state_notify, |
| 2950 | .acquire = xfrm_send_acquire, |
| 2951 | .compile_policy = xfrm_compile_policy, |
| 2952 | .notify_policy = xfrm_send_policy_notify, |
| 2953 | .report = xfrm_send_report, |
| 2954 | .migrate = xfrm_send_migrate, |
| 2955 | .new_mapping = xfrm_send_mapping, |
| 2956 | }; |
| 2957 | |
| 2958 | static int __net_init xfrm_user_net_init(struct net *net) |
| 2959 | { |
| 2960 | struct sock *nlsk; |
| 2961 | struct netlink_kernel_cfg cfg = { |
| 2962 | .groups = XFRMNLGRP_MAX, |
| 2963 | .input = xfrm_netlink_rcv, |
| 2964 | }; |
| 2965 | |
| 2966 | nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg); |
| 2967 | if (nlsk == NULL) |
| 2968 | return -ENOMEM; |
| 2969 | net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */ |
| 2970 | rcu_assign_pointer(net->xfrm.nlsk, nlsk); |
| 2971 | return 0; |
| 2972 | } |
| 2973 | |
| 2974 | static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list) |
| 2975 | { |
| 2976 | struct net *net; |
| 2977 | list_for_each_entry(net, net_exit_list, exit_list) |
| 2978 | RCU_INIT_POINTER(net->xfrm.nlsk, NULL); |
| 2979 | synchronize_net(); |
| 2980 | list_for_each_entry(net, net_exit_list, exit_list) |
| 2981 | netlink_kernel_release(net->xfrm.nlsk_stash); |
| 2982 | } |
| 2983 | |
| 2984 | static struct pernet_operations xfrm_user_net_ops = { |
| 2985 | .init = xfrm_user_net_init, |
| 2986 | .exit_batch = xfrm_user_net_exit, |
| 2987 | }; |
| 2988 | |
| 2989 | static int __init xfrm_user_init(void) |
| 2990 | { |
| 2991 | int rv; |
| 2992 | |
| 2993 | printk(KERN_INFO "Initializing XFRM netlink socket\n"); |
| 2994 | |
| 2995 | rv = register_pernet_subsys(&xfrm_user_net_ops); |
| 2996 | if (rv < 0) |
| 2997 | return rv; |
| 2998 | rv = xfrm_register_km(&netlink_mgr); |
| 2999 | if (rv < 0) |
| 3000 | unregister_pernet_subsys(&xfrm_user_net_ops); |
| 3001 | return rv; |
| 3002 | } |
| 3003 | |
| 3004 | static void __exit xfrm_user_exit(void) |
| 3005 | { |
| 3006 | xfrm_unregister_km(&netlink_mgr); |
| 3007 | unregister_pernet_subsys(&xfrm_user_net_ops); |
| 3008 | } |
| 3009 | |
| 3010 | module_init(xfrm_user_init); |
| 3011 | module_exit(xfrm_user_exit); |
| 3012 | MODULE_LICENSE("GPL"); |
| 3013 | MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM); |
| 3014 | |