1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * XFRM compat layer 4 * Author: Dmitry Safonov <dima@arista.com> 5 * Based on code and translator idea by: Florian Westphal <fw@strlen.de> 6 */ 7 #include <linux/compat.h> 8 #include <linux/nospec.h> 9 #include <linux/xfrm.h> 10 #include <net/xfrm.h> 11 12 struct compat_xfrm_lifetime_cfg { 13 compat_u64 soft_byte_limit, hard_byte_limit; 14 compat_u64 soft_packet_limit, hard_packet_limit; 15 compat_u64 soft_add_expires_seconds, hard_add_expires_seconds; 16 compat_u64 soft_use_expires_seconds, hard_use_expires_seconds; 17 }; /* same size on 32bit, but only 4 byte alignment required */ 18 19 struct compat_xfrm_lifetime_cur { 20 compat_u64 bytes, packets, add_time, use_time; 21 }; /* same size on 32bit, but only 4 byte alignment required */ 22 23 struct compat_xfrm_userpolicy_info { 24 struct xfrm_selector sel; 25 struct compat_xfrm_lifetime_cfg lft; 26 struct compat_xfrm_lifetime_cur curlft; 27 __u32 priority, index; 28 u8 dir, action, flags, share; 29 /* 4 bytes additional padding on 64bit */ 30 }; 31 32 struct compat_xfrm_usersa_info { 33 struct xfrm_selector sel; 34 struct xfrm_id id; 35 xfrm_address_t saddr; 36 struct compat_xfrm_lifetime_cfg lft; 37 struct compat_xfrm_lifetime_cur curlft; 38 struct xfrm_stats stats; 39 __u32 seq, reqid; 40 u16 family; 41 u8 mode, replay_window, flags; 42 /* 4 bytes additional padding on 64bit */ 43 }; 44 45 struct compat_xfrm_user_acquire { 46 struct xfrm_id id; 47 xfrm_address_t saddr; 48 struct xfrm_selector sel; 49 struct compat_xfrm_userpolicy_info policy; 50 /* 4 bytes additional padding on 64bit */ 51 __u32 aalgos, ealgos, calgos, seq; 52 }; 53 54 struct compat_xfrm_userspi_info { 55 struct compat_xfrm_usersa_info info; 56 /* 4 bytes additional padding on 64bit */ 57 __u32 min, max; 58 }; 59 60 struct compat_xfrm_user_expire { 61 struct compat_xfrm_usersa_info state; 62 /* 8 bytes additional padding on 64bit */ 63 u8 hard; 64 }; 65 66 struct compat_xfrm_user_polexpire { 67 struct compat_xfrm_userpolicy_info pol; 68 /* 8 bytes additional padding on 64bit */ 69 u8 hard; 70 }; 71 72 #define XMSGSIZE(type) sizeof(struct type) 73 74 static const int compat_msg_min[XFRM_NR_MSGTYPES] = { 75 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(compat_xfrm_usersa_info), 76 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), 77 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), 78 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(compat_xfrm_userpolicy_info), 79 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 80 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 81 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(compat_xfrm_userspi_info), 82 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(compat_xfrm_user_acquire), 83 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(compat_xfrm_user_expire), 84 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(compat_xfrm_userpolicy_info), 85 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(compat_xfrm_usersa_info), 86 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(compat_xfrm_user_polexpire), 87 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush), 88 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0, 89 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), 90 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), 91 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report), 92 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 93 [XFRM_MSG_NEWSADINFO - XFRM_MSG_BASE] = sizeof(u32), 94 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32), 95 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = sizeof(u32), 96 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32), 97 [XFRM_MSG_MAPPING - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_mapping) 98 }; 99 100 static const struct nla_policy compat_policy[XFRMA_MAX+1] = { 101 [XFRMA_UNSPEC] = { .strict_start_type = XFRMA_SA_DIR }, 102 [XFRMA_SA] = { .len = XMSGSIZE(compat_xfrm_usersa_info)}, 103 [XFRMA_POLICY] = { .len = XMSGSIZE(compat_xfrm_userpolicy_info)}, 104 [XFRMA_LASTUSED] = { .type = NLA_U64}, 105 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)}, 106 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) }, 107 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) }, 108 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) }, 109 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) }, 110 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) }, 111 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) }, 112 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_user_sec_ctx) }, 113 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) }, 114 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) }, 115 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 }, 116 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 }, 117 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) }, 118 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) }, 119 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)}, 120 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) }, 121 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) }, 122 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) }, 123 [XFRMA_TFCPAD] = { .type = NLA_U32 }, 124 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) }, 125 [XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 }, 126 [XFRMA_PROTO] = { .type = NLA_U8 }, 127 [XFRMA_ADDRESS_FILTER] = { .len = sizeof(struct xfrm_address_filter) }, 128 [XFRMA_OFFLOAD_DEV] = { .len = sizeof(struct xfrm_user_offload) }, 129 [XFRMA_SET_MARK] = { .type = NLA_U32 }, 130 [XFRMA_SET_MARK_MASK] = { .type = NLA_U32 }, 131 [XFRMA_IF_ID] = { .type = NLA_U32 }, 132 [XFRMA_MTIMER_THRESH] = { .type = NLA_U32 }, 133 [XFRMA_SA_DIR] = NLA_POLICY_RANGE(NLA_U8, XFRM_SA_DIR_IN, XFRM_SA_DIR_OUT), 134 }; 135 136 static struct nlmsghdr *xfrm_nlmsg_put_compat(struct sk_buff *skb, 137 const struct nlmsghdr *nlh_src, u16 type) 138 { 139 int payload = compat_msg_min[type]; 140 int src_len = xfrm_msg_min[type]; 141 struct nlmsghdr *nlh_dst; 142 143 /* Compat messages are shorter or equal to native (+padding) */ 144 if (WARN_ON_ONCE(src_len < payload)) 145 return ERR_PTR(-EMSGSIZE); 146 147 nlh_dst = nlmsg_put(skb, nlh_src->nlmsg_pid, nlh_src->nlmsg_seq, 148 nlh_src->nlmsg_type, payload, nlh_src->nlmsg_flags); 149 if (!nlh_dst) 150 return ERR_PTR(-EMSGSIZE); 151 152 memset(nlmsg_data(nlh_dst), 0, payload); 153 154 switch (nlh_src->nlmsg_type) { 155 /* Compat message has the same layout as native */ 156 case XFRM_MSG_DELSA: 157 case XFRM_MSG_DELPOLICY: 158 case XFRM_MSG_FLUSHSA: 159 case XFRM_MSG_FLUSHPOLICY: 160 case XFRM_MSG_NEWAE: 161 case XFRM_MSG_REPORT: 162 case XFRM_MSG_MIGRATE: 163 case XFRM_MSG_NEWSADINFO: 164 case XFRM_MSG_NEWSPDINFO: 165 case XFRM_MSG_MAPPING: 166 WARN_ON_ONCE(src_len != payload); 167 memcpy(nlmsg_data(nlh_dst), nlmsg_data(nlh_src), src_len); 168 break; 169 /* 4 byte alignment for trailing u64 on native, but not on compat */ 170 case XFRM_MSG_NEWSA: 171 case XFRM_MSG_NEWPOLICY: 172 case XFRM_MSG_UPDSA: 173 case XFRM_MSG_UPDPOLICY: 174 WARN_ON_ONCE(src_len != payload + 4); 175 memcpy(nlmsg_data(nlh_dst), nlmsg_data(nlh_src), payload); 176 break; 177 case XFRM_MSG_EXPIRE: { 178 const struct xfrm_user_expire *src_ue = nlmsg_data(nlh_src); 179 struct compat_xfrm_user_expire *dst_ue = nlmsg_data(nlh_dst); 180 181 /* compat_xfrm_user_expire has 4-byte smaller state */ 182 memcpy(dst_ue, src_ue, sizeof(dst_ue->state)); 183 dst_ue->hard = src_ue->hard; 184 break; 185 } 186 case XFRM_MSG_ACQUIRE: { 187 const struct xfrm_user_acquire *src_ua = nlmsg_data(nlh_src); 188 struct compat_xfrm_user_acquire *dst_ua = nlmsg_data(nlh_dst); 189 190 memcpy(dst_ua, src_ua, offsetof(struct compat_xfrm_user_acquire, aalgos)); 191 dst_ua->aalgos = src_ua->aalgos; 192 dst_ua->ealgos = src_ua->ealgos; 193 dst_ua->calgos = src_ua->calgos; 194 dst_ua->seq = src_ua->seq; 195 break; 196 } 197 case XFRM_MSG_POLEXPIRE: { 198 const struct xfrm_user_polexpire *src_upe = nlmsg_data(nlh_src); 199 struct compat_xfrm_user_polexpire *dst_upe = nlmsg_data(nlh_dst); 200 201 /* compat_xfrm_user_polexpire has 4-byte smaller state */ 202 memcpy(dst_upe, src_upe, sizeof(dst_upe->pol)); 203 dst_upe->hard = src_upe->hard; 204 break; 205 } 206 case XFRM_MSG_ALLOCSPI: { 207 const struct xfrm_userspi_info *src_usi = nlmsg_data(nlh_src); 208 struct compat_xfrm_userspi_info *dst_usi = nlmsg_data(nlh_dst); 209 210 /* compat_xfrm_user_polexpire has 4-byte smaller state */ 211 memcpy(dst_usi, src_usi, sizeof(src_usi->info)); 212 dst_usi->min = src_usi->min; 213 dst_usi->max = src_usi->max; 214 break; 215 } 216 /* Not being sent by kernel */ 217 case XFRM_MSG_GETSA: 218 case XFRM_MSG_GETPOLICY: 219 case XFRM_MSG_GETAE: 220 case XFRM_MSG_GETSADINFO: 221 case XFRM_MSG_GETSPDINFO: 222 default: 223 pr_warn_once("unsupported nlmsg_type %d\n", nlh_src->nlmsg_type); 224 return ERR_PTR(-EOPNOTSUPP); 225 } 226 227 return nlh_dst; 228 } 229 230 static int xfrm_nla_cpy(struct sk_buff *dst, const struct nlattr *src, int len) 231 { 232 return nla_put(dst, src->nla_type, len, nla_data(src)); 233 } 234 235 static int xfrm_xlate64_attr(struct sk_buff *dst, const struct nlattr *src) 236 { 237 switch (src->nla_type) { 238 case XFRMA_PAD: 239 /* Ignore */ 240 return 0; 241 case XFRMA_UNSPEC: 242 case XFRMA_ALG_AUTH: 243 case XFRMA_ALG_CRYPT: 244 case XFRMA_ALG_COMP: 245 case XFRMA_ENCAP: 246 case XFRMA_TMPL: 247 return xfrm_nla_cpy(dst, src, nla_len(src)); 248 case XFRMA_SA: 249 return xfrm_nla_cpy(dst, src, XMSGSIZE(compat_xfrm_usersa_info)); 250 case XFRMA_POLICY: 251 return xfrm_nla_cpy(dst, src, XMSGSIZE(compat_xfrm_userpolicy_info)); 252 case XFRMA_SEC_CTX: 253 return xfrm_nla_cpy(dst, src, nla_len(src)); 254 case XFRMA_LTIME_VAL: 255 return nla_put_64bit(dst, src->nla_type, nla_len(src), 256 nla_data(src), XFRMA_PAD); 257 case XFRMA_REPLAY_VAL: 258 case XFRMA_REPLAY_THRESH: 259 case XFRMA_ETIMER_THRESH: 260 case XFRMA_SRCADDR: 261 case XFRMA_COADDR: 262 return xfrm_nla_cpy(dst, src, nla_len(src)); 263 case XFRMA_LASTUSED: 264 return nla_put_64bit(dst, src->nla_type, nla_len(src), 265 nla_data(src), XFRMA_PAD); 266 case XFRMA_POLICY_TYPE: 267 case XFRMA_MIGRATE: 268 case XFRMA_ALG_AEAD: 269 case XFRMA_KMADDRESS: 270 case XFRMA_ALG_AUTH_TRUNC: 271 case XFRMA_MARK: 272 case XFRMA_TFCPAD: 273 case XFRMA_REPLAY_ESN_VAL: 274 case XFRMA_SA_EXTRA_FLAGS: 275 case XFRMA_PROTO: 276 case XFRMA_ADDRESS_FILTER: 277 case XFRMA_OFFLOAD_DEV: 278 case XFRMA_SET_MARK: 279 case XFRMA_SET_MARK_MASK: 280 case XFRMA_IF_ID: 281 case XFRMA_MTIMER_THRESH: 282 case XFRMA_SA_DIR: 283 return xfrm_nla_cpy(dst, src, nla_len(src)); 284 default: 285 BUILD_BUG_ON(XFRMA_MAX != XFRMA_SA_DIR); 286 pr_warn_once("unsupported nla_type %d\n", src->nla_type); 287 return -EOPNOTSUPP; 288 } 289 } 290 291 /* Take kernel-built (64bit layout) and create 32bit layout for userspace */ 292 static int xfrm_xlate64(struct sk_buff *dst, const struct nlmsghdr *nlh_src) 293 { 294 u16 type = nlh_src->nlmsg_type - XFRM_MSG_BASE; 295 const struct nlattr *nla, *attrs; 296 struct nlmsghdr *nlh_dst; 297 int len, remaining; 298 299 nlh_dst = xfrm_nlmsg_put_compat(dst, nlh_src, type); 300 if (IS_ERR(nlh_dst)) 301 return PTR_ERR(nlh_dst); 302 303 attrs = nlmsg_attrdata(nlh_src, xfrm_msg_min[type]); 304 len = nlmsg_attrlen(nlh_src, xfrm_msg_min[type]); 305 306 nla_for_each_attr(nla, attrs, len, remaining) { 307 int err; 308 309 switch (nlh_src->nlmsg_type) { 310 case XFRM_MSG_NEWSPDINFO: 311 err = xfrm_nla_cpy(dst, nla, nla_len(nla)); 312 break; 313 default: 314 err = xfrm_xlate64_attr(dst, nla); 315 break; 316 } 317 if (err) 318 return err; 319 } 320 321 nlmsg_end(dst, nlh_dst); 322 323 return 0; 324 } 325 326 static int xfrm_alloc_compat(struct sk_buff *skb, const struct nlmsghdr *nlh_src) 327 { 328 u16 type = nlh_src->nlmsg_type - XFRM_MSG_BASE; 329 struct sk_buff *new = NULL; 330 int err; 331 332 if (type >= ARRAY_SIZE(xfrm_msg_min)) { 333 pr_warn_once("unsupported nlmsg_type %d\n", nlh_src->nlmsg_type); 334 return -EOPNOTSUPP; 335 } 336 337 if (skb_shinfo(skb)->frag_list == NULL) { 338 new = alloc_skb(skb->len + skb_tailroom(skb), GFP_ATOMIC); 339 if (!new) 340 return -ENOMEM; 341 skb_shinfo(skb)->frag_list = new; 342 } 343 344 err = xfrm_xlate64(skb_shinfo(skb)->frag_list, nlh_src); 345 if (err) { 346 if (new) { 347 kfree_skb(new); 348 skb_shinfo(skb)->frag_list = NULL; 349 } 350 return err; 351 } 352 353 return 0; 354 } 355 356 /* Calculates len of translated 64-bit message. */ 357 static size_t xfrm_user_rcv_calculate_len64(const struct nlmsghdr *src, 358 struct nlattr *attrs[XFRMA_MAX + 1], 359 int maxtype) 360 { 361 size_t len = nlmsg_len(src); 362 363 switch (src->nlmsg_type) { 364 case XFRM_MSG_NEWSA: 365 case XFRM_MSG_NEWPOLICY: 366 case XFRM_MSG_ALLOCSPI: 367 case XFRM_MSG_ACQUIRE: 368 case XFRM_MSG_UPDPOLICY: 369 case XFRM_MSG_UPDSA: 370 len += 4; 371 break; 372 case XFRM_MSG_EXPIRE: 373 case XFRM_MSG_POLEXPIRE: 374 len += 8; 375 break; 376 case XFRM_MSG_NEWSPDINFO: 377 /* attirbutes are xfrm_spdattr_type_t, not xfrm_attr_type_t */ 378 return len; 379 default: 380 break; 381 } 382 383 /* Unexpected for anything, but XFRM_MSG_NEWSPDINFO, please 384 * correct both 64=>32-bit and 32=>64-bit translators to copy 385 * new attributes. 386 */ 387 if (WARN_ON_ONCE(maxtype)) 388 return len; 389 390 if (attrs[XFRMA_SA]) 391 len += 4; 392 if (attrs[XFRMA_POLICY]) 393 len += 4; 394 395 /* XXX: some attrs may need to be realigned 396 * if !CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS 397 */ 398 399 return len; 400 } 401 402 static int xfrm_attr_cpy32(void *dst, size_t *pos, const struct nlattr *src, 403 size_t size, int copy_len, int payload) 404 { 405 struct nlmsghdr *nlmsg = dst; 406 struct nlattr *nla; 407 408 /* xfrm_user_rcv_msg_compat() relies on fact that 32-bit messages 409 * have the same len or shorted than 64-bit ones. 410 * 32-bit translation that is bigger than 64-bit original is unexpected. 411 */ 412 if (WARN_ON_ONCE(copy_len > payload)) 413 copy_len = payload; 414 415 if (size - *pos < nla_attr_size(payload)) 416 return -ENOBUFS; 417 418 nla = dst + *pos; 419 420 memcpy(nla, src, nla_attr_size(copy_len)); 421 nla->nla_len = nla_attr_size(payload); 422 *pos += nla_attr_size(copy_len); 423 nlmsg->nlmsg_len += nla->nla_len; 424 425 memset(dst + *pos, 0, payload - copy_len); 426 *pos += payload - copy_len; 427 428 return 0; 429 } 430 431 static int xfrm_xlate32_attr(void *dst, const struct nlattr *nla, 432 size_t *pos, size_t size, 433 struct netlink_ext_ack *extack) 434 { 435 int type = nla_type(nla); 436 u16 pol_len32, pol_len64; 437 int err; 438 439 if (type > XFRMA_MAX) { 440 BUILD_BUG_ON(XFRMA_MAX != XFRMA_SA_DIR); 441 NL_SET_ERR_MSG(extack, "Bad attribute"); 442 return -EOPNOTSUPP; 443 } 444 type = array_index_nospec(type, XFRMA_MAX + 1); 445 if (nla_len(nla) < compat_policy[type].len) { 446 NL_SET_ERR_MSG(extack, "Attribute bad length"); 447 return -EOPNOTSUPP; 448 } 449 450 pol_len32 = compat_policy[type].len; 451 pol_len64 = xfrma_policy[type].len; 452 453 /* XFRMA_SA and XFRMA_POLICY - need to know how-to translate */ 454 if (pol_len32 != pol_len64) { 455 if (nla_len(nla) != compat_policy[type].len) { 456 NL_SET_ERR_MSG(extack, "Attribute bad length"); 457 return -EOPNOTSUPP; 458 } 459 err = xfrm_attr_cpy32(dst, pos, nla, size, pol_len32, pol_len64); 460 if (err) 461 return err; 462 } 463 464 return xfrm_attr_cpy32(dst, pos, nla, size, nla_len(nla), nla_len(nla)); 465 } 466 467 static int xfrm_xlate32(struct nlmsghdr *dst, const struct nlmsghdr *src, 468 struct nlattr *attrs[XFRMA_MAX+1], 469 size_t size, u8 type, int maxtype, 470 struct netlink_ext_ack *extack) 471 { 472 size_t pos; 473 int i; 474 475 memcpy(dst, src, NLMSG_HDRLEN); 476 dst->nlmsg_len = NLMSG_HDRLEN + xfrm_msg_min[type]; 477 memset(nlmsg_data(dst), 0, xfrm_msg_min[type]); 478 479 switch (src->nlmsg_type) { 480 /* Compat message has the same layout as native */ 481 case XFRM_MSG_DELSA: 482 case XFRM_MSG_GETSA: 483 case XFRM_MSG_DELPOLICY: 484 case XFRM_MSG_GETPOLICY: 485 case XFRM_MSG_FLUSHSA: 486 case XFRM_MSG_FLUSHPOLICY: 487 case XFRM_MSG_NEWAE: 488 case XFRM_MSG_GETAE: 489 case XFRM_MSG_REPORT: 490 case XFRM_MSG_MIGRATE: 491 case XFRM_MSG_NEWSADINFO: 492 case XFRM_MSG_GETSADINFO: 493 case XFRM_MSG_NEWSPDINFO: 494 case XFRM_MSG_GETSPDINFO: 495 case XFRM_MSG_MAPPING: 496 memcpy(nlmsg_data(dst), nlmsg_data(src), compat_msg_min[type]); 497 break; 498 /* 4 byte alignment for trailing u64 on native, but not on compat */ 499 case XFRM_MSG_NEWSA: 500 case XFRM_MSG_NEWPOLICY: 501 case XFRM_MSG_UPDSA: 502 case XFRM_MSG_UPDPOLICY: 503 memcpy(nlmsg_data(dst), nlmsg_data(src), compat_msg_min[type]); 504 break; 505 case XFRM_MSG_EXPIRE: { 506 const struct compat_xfrm_user_expire *src_ue = nlmsg_data(src); 507 struct xfrm_user_expire *dst_ue = nlmsg_data(dst); 508 509 /* compat_xfrm_user_expire has 4-byte smaller state */ 510 memcpy(dst_ue, src_ue, sizeof(src_ue->state)); 511 dst_ue->hard = src_ue->hard; 512 break; 513 } 514 case XFRM_MSG_ACQUIRE: { 515 const struct compat_xfrm_user_acquire *src_ua = nlmsg_data(src); 516 struct xfrm_user_acquire *dst_ua = nlmsg_data(dst); 517 518 memcpy(dst_ua, src_ua, offsetof(struct compat_xfrm_user_acquire, aalgos)); 519 dst_ua->aalgos = src_ua->aalgos; 520 dst_ua->ealgos = src_ua->ealgos; 521 dst_ua->calgos = src_ua->calgos; 522 dst_ua->seq = src_ua->seq; 523 break; 524 } 525 case XFRM_MSG_POLEXPIRE: { 526 const struct compat_xfrm_user_polexpire *src_upe = nlmsg_data(src); 527 struct xfrm_user_polexpire *dst_upe = nlmsg_data(dst); 528 529 /* compat_xfrm_user_polexpire has 4-byte smaller state */ 530 memcpy(dst_upe, src_upe, sizeof(src_upe->pol)); 531 dst_upe->hard = src_upe->hard; 532 break; 533 } 534 case XFRM_MSG_ALLOCSPI: { 535 const struct compat_xfrm_userspi_info *src_usi = nlmsg_data(src); 536 struct xfrm_userspi_info *dst_usi = nlmsg_data(dst); 537 538 /* compat_xfrm_user_polexpire has 4-byte smaller state */ 539 memcpy(dst_usi, src_usi, sizeof(src_usi->info)); 540 dst_usi->min = src_usi->min; 541 dst_usi->max = src_usi->max; 542 break; 543 } 544 default: 545 NL_SET_ERR_MSG(extack, "Unsupported message type"); 546 return -EOPNOTSUPP; 547 } 548 pos = dst->nlmsg_len; 549 550 if (maxtype) { 551 /* attirbutes are xfrm_spdattr_type_t, not xfrm_attr_type_t */ 552 WARN_ON_ONCE(src->nlmsg_type != XFRM_MSG_NEWSPDINFO); 553 554 for (i = 1; i <= maxtype; i++) { 555 int err; 556 557 if (!attrs[i]) 558 continue; 559 560 /* just copy - no need for translation */ 561 err = xfrm_attr_cpy32(dst, &pos, attrs[i], size, 562 nla_len(attrs[i]), nla_len(attrs[i])); 563 if (err) 564 return err; 565 } 566 return 0; 567 } 568 569 for (i = 1; i < XFRMA_MAX + 1; i++) { 570 int err; 571 572 if (i == XFRMA_PAD) 573 continue; 574 575 if (!attrs[i]) 576 continue; 577 578 err = xfrm_xlate32_attr(dst, attrs[i], &pos, size, extack); 579 if (err) 580 return err; 581 } 582 583 return 0; 584 } 585 586 static struct nlmsghdr *xfrm_user_rcv_msg_compat(const struct nlmsghdr *h32, 587 int maxtype, const struct nla_policy *policy, 588 struct netlink_ext_ack *extack) 589 { 590 /* netlink_rcv_skb() checks if a message has full (struct nlmsghdr) */ 591 u16 type = h32->nlmsg_type - XFRM_MSG_BASE; 592 struct nlattr *attrs[XFRMA_MAX+1]; 593 struct nlmsghdr *h64; 594 size_t len; 595 int err; 596 597 BUILD_BUG_ON(ARRAY_SIZE(xfrm_msg_min) != ARRAY_SIZE(compat_msg_min)); 598 599 if (type >= ARRAY_SIZE(xfrm_msg_min)) 600 return ERR_PTR(-EINVAL); 601 602 /* Don't call parse: the message might have only nlmsg header */ 603 if ((h32->nlmsg_type == XFRM_MSG_GETSA || 604 h32->nlmsg_type == XFRM_MSG_GETPOLICY) && 605 (h32->nlmsg_flags & NLM_F_DUMP)) 606 return NULL; 607 608 err = nlmsg_parse_deprecated(h32, compat_msg_min[type], attrs, 609 maxtype ? : XFRMA_MAX, policy ? : compat_policy, extack); 610 if (err < 0) 611 return ERR_PTR(err); 612 613 len = xfrm_user_rcv_calculate_len64(h32, attrs, maxtype); 614 /* The message doesn't need translation */ 615 if (len == nlmsg_len(h32)) 616 return NULL; 617 618 len += NLMSG_HDRLEN; 619 h64 = kvmalloc(len, GFP_KERNEL); 620 if (!h64) 621 return ERR_PTR(-ENOMEM); 622 623 err = xfrm_xlate32(h64, h32, attrs, len, type, maxtype, extack); 624 if (err < 0) { 625 kvfree(h64); 626 return ERR_PTR(err); 627 } 628 629 return h64; 630 } 631 632 static int xfrm_user_policy_compat(u8 **pdata32, int optlen) 633 { 634 struct compat_xfrm_userpolicy_info *p = (void *)*pdata32; 635 u8 *src_templates, *dst_templates; 636 u8 *data64; 637 638 if (optlen < sizeof(*p)) 639 return -EINVAL; 640 641 data64 = kmalloc_track_caller(optlen + 4, GFP_USER | __GFP_NOWARN); 642 if (!data64) 643 return -ENOMEM; 644 645 memcpy(data64, *pdata32, sizeof(*p)); 646 memset(data64 + sizeof(*p), 0, 4); 647 648 src_templates = *pdata32 + sizeof(*p); 649 dst_templates = data64 + sizeof(*p) + 4; 650 memcpy(dst_templates, src_templates, optlen - sizeof(*p)); 651 652 kfree(*pdata32); 653 *pdata32 = data64; 654 return 0; 655 } 656 657 static struct xfrm_translator xfrm_translator = { 658 .owner = THIS_MODULE, 659 .alloc_compat = xfrm_alloc_compat, 660 .rcv_msg_compat = xfrm_user_rcv_msg_compat, 661 .xlate_user_policy_sockptr = xfrm_user_policy_compat, 662 }; 663 664 static int __init xfrm_compat_init(void) 665 { 666 return xfrm_register_translator(&xfrm_translator); 667 } 668 669 static void __exit xfrm_compat_exit(void) 670 { 671 xfrm_unregister_translator(&xfrm_translator); 672 } 673 674 module_init(xfrm_compat_init); 675 module_exit(xfrm_compat_exit); 676 MODULE_LICENSE("GPL"); 677 MODULE_AUTHOR("Dmitry Safonov"); 678 MODULE_DESCRIPTION("XFRM 32-bit compatibility layer"); 679