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 [XFRMA_NAT_KEEPALIVE_INTERVAL] = { .type = NLA_U32 }, 135 [XFRMA_SA_PCPU] = { .type = NLA_U32 }, 136 }; 137 138 static struct nlmsghdr *xfrm_nlmsg_put_compat(struct sk_buff *skb, 139 const struct nlmsghdr *nlh_src, u16 type) 140 { 141 int payload = compat_msg_min[type]; 142 int src_len = xfrm_msg_min[type]; 143 struct nlmsghdr *nlh_dst; 144 145 /* Compat messages are shorter or equal to native (+padding) */ 146 if (WARN_ON_ONCE(src_len < payload)) 147 return ERR_PTR(-EMSGSIZE); 148 149 nlh_dst = nlmsg_put(skb, nlh_src->nlmsg_pid, nlh_src->nlmsg_seq, 150 nlh_src->nlmsg_type, payload, nlh_src->nlmsg_flags); 151 if (!nlh_dst) 152 return ERR_PTR(-EMSGSIZE); 153 154 memset(nlmsg_data(nlh_dst), 0, payload); 155 156 switch (nlh_src->nlmsg_type) { 157 /* Compat message has the same layout as native */ 158 case XFRM_MSG_DELSA: 159 case XFRM_MSG_DELPOLICY: 160 case XFRM_MSG_FLUSHSA: 161 case XFRM_MSG_FLUSHPOLICY: 162 case XFRM_MSG_NEWAE: 163 case XFRM_MSG_REPORT: 164 case XFRM_MSG_MIGRATE: 165 case XFRM_MSG_NEWSADINFO: 166 case XFRM_MSG_NEWSPDINFO: 167 case XFRM_MSG_MAPPING: 168 WARN_ON_ONCE(src_len != payload); 169 memcpy(nlmsg_data(nlh_dst), nlmsg_data(nlh_src), src_len); 170 break; 171 /* 4 byte alignment for trailing u64 on native, but not on compat */ 172 case XFRM_MSG_NEWSA: 173 case XFRM_MSG_NEWPOLICY: 174 case XFRM_MSG_UPDSA: 175 case XFRM_MSG_UPDPOLICY: 176 WARN_ON_ONCE(src_len != payload + 4); 177 memcpy(nlmsg_data(nlh_dst), nlmsg_data(nlh_src), payload); 178 break; 179 case XFRM_MSG_EXPIRE: { 180 const struct xfrm_user_expire *src_ue = nlmsg_data(nlh_src); 181 struct compat_xfrm_user_expire *dst_ue = nlmsg_data(nlh_dst); 182 183 /* compat_xfrm_user_expire has 4-byte smaller state */ 184 memcpy(dst_ue, src_ue, sizeof(dst_ue->state)); 185 dst_ue->hard = src_ue->hard; 186 break; 187 } 188 case XFRM_MSG_ACQUIRE: { 189 const struct xfrm_user_acquire *src_ua = nlmsg_data(nlh_src); 190 struct compat_xfrm_user_acquire *dst_ua = nlmsg_data(nlh_dst); 191 192 memcpy(dst_ua, src_ua, offsetof(struct compat_xfrm_user_acquire, aalgos)); 193 dst_ua->aalgos = src_ua->aalgos; 194 dst_ua->ealgos = src_ua->ealgos; 195 dst_ua->calgos = src_ua->calgos; 196 dst_ua->seq = src_ua->seq; 197 break; 198 } 199 case XFRM_MSG_POLEXPIRE: { 200 const struct xfrm_user_polexpire *src_upe = nlmsg_data(nlh_src); 201 struct compat_xfrm_user_polexpire *dst_upe = nlmsg_data(nlh_dst); 202 203 /* compat_xfrm_user_polexpire has 4-byte smaller state */ 204 memcpy(dst_upe, src_upe, sizeof(dst_upe->pol)); 205 dst_upe->hard = src_upe->hard; 206 break; 207 } 208 case XFRM_MSG_ALLOCSPI: { 209 const struct xfrm_userspi_info *src_usi = nlmsg_data(nlh_src); 210 struct compat_xfrm_userspi_info *dst_usi = nlmsg_data(nlh_dst); 211 212 /* compat_xfrm_user_polexpire has 4-byte smaller state */ 213 memcpy(dst_usi, src_usi, sizeof(src_usi->info)); 214 dst_usi->min = src_usi->min; 215 dst_usi->max = src_usi->max; 216 break; 217 } 218 /* Not being sent by kernel */ 219 case XFRM_MSG_GETSA: 220 case XFRM_MSG_GETPOLICY: 221 case XFRM_MSG_GETAE: 222 case XFRM_MSG_GETSADINFO: 223 case XFRM_MSG_GETSPDINFO: 224 default: 225 pr_warn_once("unsupported nlmsg_type %d\n", nlh_src->nlmsg_type); 226 return ERR_PTR(-EOPNOTSUPP); 227 } 228 229 return nlh_dst; 230 } 231 232 static int xfrm_nla_cpy(struct sk_buff *dst, const struct nlattr *src, int len) 233 { 234 return nla_put(dst, src->nla_type, len, nla_data(src)); 235 } 236 237 static int xfrm_xlate64_attr(struct sk_buff *dst, const struct nlattr *src) 238 { 239 switch (src->nla_type) { 240 case XFRMA_PAD: 241 /* Ignore */ 242 return 0; 243 case XFRMA_UNSPEC: 244 case XFRMA_ALG_AUTH: 245 case XFRMA_ALG_CRYPT: 246 case XFRMA_ALG_COMP: 247 case XFRMA_ENCAP: 248 case XFRMA_TMPL: 249 return xfrm_nla_cpy(dst, src, nla_len(src)); 250 case XFRMA_SA: 251 return xfrm_nla_cpy(dst, src, XMSGSIZE(compat_xfrm_usersa_info)); 252 case XFRMA_POLICY: 253 return xfrm_nla_cpy(dst, src, XMSGSIZE(compat_xfrm_userpolicy_info)); 254 case XFRMA_SEC_CTX: 255 return xfrm_nla_cpy(dst, src, nla_len(src)); 256 case XFRMA_LTIME_VAL: 257 return nla_put_64bit(dst, src->nla_type, nla_len(src), 258 nla_data(src), XFRMA_PAD); 259 case XFRMA_REPLAY_VAL: 260 case XFRMA_REPLAY_THRESH: 261 case XFRMA_ETIMER_THRESH: 262 case XFRMA_SRCADDR: 263 case XFRMA_COADDR: 264 return xfrm_nla_cpy(dst, src, nla_len(src)); 265 case XFRMA_LASTUSED: 266 return nla_put_64bit(dst, src->nla_type, nla_len(src), 267 nla_data(src), XFRMA_PAD); 268 case XFRMA_POLICY_TYPE: 269 case XFRMA_MIGRATE: 270 case XFRMA_ALG_AEAD: 271 case XFRMA_KMADDRESS: 272 case XFRMA_ALG_AUTH_TRUNC: 273 case XFRMA_MARK: 274 case XFRMA_TFCPAD: 275 case XFRMA_REPLAY_ESN_VAL: 276 case XFRMA_SA_EXTRA_FLAGS: 277 case XFRMA_PROTO: 278 case XFRMA_ADDRESS_FILTER: 279 case XFRMA_OFFLOAD_DEV: 280 case XFRMA_SET_MARK: 281 case XFRMA_SET_MARK_MASK: 282 case XFRMA_IF_ID: 283 case XFRMA_MTIMER_THRESH: 284 case XFRMA_SA_DIR: 285 case XFRMA_NAT_KEEPALIVE_INTERVAL: 286 case XFRMA_SA_PCPU: 287 case XFRMA_IPTFS_DROP_TIME: 288 case XFRMA_IPTFS_REORDER_WINDOW: 289 case XFRMA_IPTFS_DONT_FRAG: 290 case XFRMA_IPTFS_INIT_DELAY: 291 case XFRMA_IPTFS_MAX_QSIZE: 292 case XFRMA_IPTFS_PKT_SIZE: 293 return xfrm_nla_cpy(dst, src, nla_len(src)); 294 default: 295 BUILD_BUG_ON(XFRMA_MAX != XFRMA_IPTFS_PKT_SIZE); 296 pr_warn_once("unsupported nla_type %d\n", src->nla_type); 297 return -EOPNOTSUPP; 298 } 299 } 300 301 /* Take kernel-built (64bit layout) and create 32bit layout for userspace */ 302 static int xfrm_xlate64(struct sk_buff *dst, const struct nlmsghdr *nlh_src) 303 { 304 u16 type = nlh_src->nlmsg_type - XFRM_MSG_BASE; 305 const struct nlattr *nla, *attrs; 306 struct nlmsghdr *nlh_dst; 307 int len, remaining; 308 309 nlh_dst = xfrm_nlmsg_put_compat(dst, nlh_src, type); 310 if (IS_ERR(nlh_dst)) 311 return PTR_ERR(nlh_dst); 312 313 attrs = nlmsg_attrdata(nlh_src, xfrm_msg_min[type]); 314 len = nlmsg_attrlen(nlh_src, xfrm_msg_min[type]); 315 316 nla_for_each_attr(nla, attrs, len, remaining) { 317 int err; 318 319 switch (nlh_src->nlmsg_type) { 320 case XFRM_MSG_NEWSPDINFO: 321 err = xfrm_nla_cpy(dst, nla, nla_len(nla)); 322 break; 323 default: 324 err = xfrm_xlate64_attr(dst, nla); 325 break; 326 } 327 if (err) 328 return err; 329 } 330 331 nlmsg_end(dst, nlh_dst); 332 333 return 0; 334 } 335 336 static int xfrm_alloc_compat(struct sk_buff *skb, const struct nlmsghdr *nlh_src) 337 { 338 u16 type = nlh_src->nlmsg_type - XFRM_MSG_BASE; 339 struct sk_buff *new = NULL; 340 int err; 341 342 if (type >= ARRAY_SIZE(xfrm_msg_min)) { 343 pr_warn_once("unsupported nlmsg_type %d\n", nlh_src->nlmsg_type); 344 return -EOPNOTSUPP; 345 } 346 347 if (skb_shinfo(skb)->frag_list == NULL) { 348 new = alloc_skb(skb->len + skb_tailroom(skb), GFP_ATOMIC); 349 if (!new) 350 return -ENOMEM; 351 skb_shinfo(skb)->frag_list = new; 352 } 353 354 err = xfrm_xlate64(skb_shinfo(skb)->frag_list, nlh_src); 355 if (err) { 356 if (new) { 357 kfree_skb(new); 358 skb_shinfo(skb)->frag_list = NULL; 359 } 360 return err; 361 } 362 363 return 0; 364 } 365 366 /* Calculates len of translated 64-bit message. */ 367 static size_t xfrm_user_rcv_calculate_len64(const struct nlmsghdr *src, 368 struct nlattr *attrs[XFRMA_MAX + 1], 369 int maxtype) 370 { 371 size_t len = nlmsg_len(src); 372 373 switch (src->nlmsg_type) { 374 case XFRM_MSG_NEWSA: 375 case XFRM_MSG_NEWPOLICY: 376 case XFRM_MSG_ALLOCSPI: 377 case XFRM_MSG_ACQUIRE: 378 case XFRM_MSG_UPDPOLICY: 379 case XFRM_MSG_UPDSA: 380 len += 4; 381 break; 382 case XFRM_MSG_EXPIRE: 383 case XFRM_MSG_POLEXPIRE: 384 len += 8; 385 break; 386 case XFRM_MSG_NEWSPDINFO: 387 /* attirbutes are xfrm_spdattr_type_t, not xfrm_attr_type_t */ 388 return len; 389 default: 390 break; 391 } 392 393 /* Unexpected for anything, but XFRM_MSG_NEWSPDINFO, please 394 * correct both 64=>32-bit and 32=>64-bit translators to copy 395 * new attributes. 396 */ 397 if (WARN_ON_ONCE(maxtype)) 398 return len; 399 400 if (attrs[XFRMA_SA]) 401 len += 4; 402 if (attrs[XFRMA_POLICY]) 403 len += 4; 404 405 /* XXX: some attrs may need to be realigned 406 * if !CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS 407 */ 408 409 return len; 410 } 411 412 static int xfrm_attr_cpy32(void *dst, size_t *pos, const struct nlattr *src, 413 size_t size, int copy_len, int payload) 414 { 415 struct nlmsghdr *nlmsg = dst; 416 struct nlattr *nla; 417 418 /* xfrm_user_rcv_msg_compat() relies on fact that 32-bit messages 419 * have the same len or shorted than 64-bit ones. 420 * 32-bit translation that is bigger than 64-bit original is unexpected. 421 */ 422 if (WARN_ON_ONCE(copy_len > payload)) 423 copy_len = payload; 424 425 if (size - *pos < nla_attr_size(payload)) 426 return -ENOBUFS; 427 428 nla = dst + *pos; 429 430 memcpy(nla, src, nla_attr_size(copy_len)); 431 nla->nla_len = nla_attr_size(payload); 432 *pos += nla_attr_size(copy_len); 433 nlmsg->nlmsg_len += nla->nla_len; 434 435 memset(dst + *pos, 0, payload - copy_len); 436 *pos += payload - copy_len; 437 438 return 0; 439 } 440 441 static int xfrm_xlate32_attr(void *dst, const struct nlattr *nla, 442 size_t *pos, size_t size, 443 struct netlink_ext_ack *extack) 444 { 445 int type = nla_type(nla); 446 u16 pol_len32, pol_len64; 447 int err; 448 449 if (type > XFRMA_MAX) { 450 BUILD_BUG_ON(XFRMA_MAX != XFRMA_IPTFS_PKT_SIZE); 451 NL_SET_ERR_MSG(extack, "Bad attribute"); 452 return -EOPNOTSUPP; 453 } 454 type = array_index_nospec(type, XFRMA_MAX + 1); 455 if (nla_len(nla) < compat_policy[type].len) { 456 NL_SET_ERR_MSG(extack, "Attribute bad length"); 457 return -EOPNOTSUPP; 458 } 459 460 pol_len32 = compat_policy[type].len; 461 pol_len64 = xfrma_policy[type].len; 462 463 /* XFRMA_SA and XFRMA_POLICY - need to know how-to translate */ 464 if (pol_len32 != pol_len64) { 465 if (nla_len(nla) != compat_policy[type].len) { 466 NL_SET_ERR_MSG(extack, "Attribute bad length"); 467 return -EOPNOTSUPP; 468 } 469 err = xfrm_attr_cpy32(dst, pos, nla, size, pol_len32, pol_len64); 470 if (err) 471 return err; 472 } 473 474 return xfrm_attr_cpy32(dst, pos, nla, size, nla_len(nla), nla_len(nla)); 475 } 476 477 static int xfrm_xlate32(struct nlmsghdr *dst, const struct nlmsghdr *src, 478 struct nlattr *attrs[XFRMA_MAX+1], 479 size_t size, u8 type, int maxtype, 480 struct netlink_ext_ack *extack) 481 { 482 size_t pos; 483 int i; 484 485 memcpy(dst, src, NLMSG_HDRLEN); 486 dst->nlmsg_len = NLMSG_HDRLEN + xfrm_msg_min[type]; 487 memset(nlmsg_data(dst), 0, xfrm_msg_min[type]); 488 489 switch (src->nlmsg_type) { 490 /* Compat message has the same layout as native */ 491 case XFRM_MSG_DELSA: 492 case XFRM_MSG_GETSA: 493 case XFRM_MSG_DELPOLICY: 494 case XFRM_MSG_GETPOLICY: 495 case XFRM_MSG_FLUSHSA: 496 case XFRM_MSG_FLUSHPOLICY: 497 case XFRM_MSG_NEWAE: 498 case XFRM_MSG_GETAE: 499 case XFRM_MSG_REPORT: 500 case XFRM_MSG_MIGRATE: 501 case XFRM_MSG_NEWSADINFO: 502 case XFRM_MSG_GETSADINFO: 503 case XFRM_MSG_NEWSPDINFO: 504 case XFRM_MSG_GETSPDINFO: 505 case XFRM_MSG_MAPPING: 506 memcpy(nlmsg_data(dst), nlmsg_data(src), compat_msg_min[type]); 507 break; 508 /* 4 byte alignment for trailing u64 on native, but not on compat */ 509 case XFRM_MSG_NEWSA: 510 case XFRM_MSG_NEWPOLICY: 511 case XFRM_MSG_UPDSA: 512 case XFRM_MSG_UPDPOLICY: 513 memcpy(nlmsg_data(dst), nlmsg_data(src), compat_msg_min[type]); 514 break; 515 case XFRM_MSG_EXPIRE: { 516 const struct compat_xfrm_user_expire *src_ue = nlmsg_data(src); 517 struct xfrm_user_expire *dst_ue = nlmsg_data(dst); 518 519 /* compat_xfrm_user_expire has 4-byte smaller state */ 520 memcpy(dst_ue, src_ue, sizeof(src_ue->state)); 521 dst_ue->hard = src_ue->hard; 522 break; 523 } 524 case XFRM_MSG_ACQUIRE: { 525 const struct compat_xfrm_user_acquire *src_ua = nlmsg_data(src); 526 struct xfrm_user_acquire *dst_ua = nlmsg_data(dst); 527 528 memcpy(dst_ua, src_ua, offsetof(struct compat_xfrm_user_acquire, aalgos)); 529 dst_ua->aalgos = src_ua->aalgos; 530 dst_ua->ealgos = src_ua->ealgos; 531 dst_ua->calgos = src_ua->calgos; 532 dst_ua->seq = src_ua->seq; 533 break; 534 } 535 case XFRM_MSG_POLEXPIRE: { 536 const struct compat_xfrm_user_polexpire *src_upe = nlmsg_data(src); 537 struct xfrm_user_polexpire *dst_upe = nlmsg_data(dst); 538 539 /* compat_xfrm_user_polexpire has 4-byte smaller state */ 540 memcpy(dst_upe, src_upe, sizeof(src_upe->pol)); 541 dst_upe->hard = src_upe->hard; 542 break; 543 } 544 case XFRM_MSG_ALLOCSPI: { 545 const struct compat_xfrm_userspi_info *src_usi = nlmsg_data(src); 546 struct xfrm_userspi_info *dst_usi = nlmsg_data(dst); 547 548 /* compat_xfrm_user_polexpire has 4-byte smaller state */ 549 memcpy(dst_usi, src_usi, sizeof(src_usi->info)); 550 dst_usi->min = src_usi->min; 551 dst_usi->max = src_usi->max; 552 break; 553 } 554 default: 555 NL_SET_ERR_MSG(extack, "Unsupported message type"); 556 return -EOPNOTSUPP; 557 } 558 pos = dst->nlmsg_len; 559 560 if (maxtype) { 561 /* attirbutes are xfrm_spdattr_type_t, not xfrm_attr_type_t */ 562 WARN_ON_ONCE(src->nlmsg_type != XFRM_MSG_NEWSPDINFO); 563 564 for (i = 1; i <= maxtype; i++) { 565 int err; 566 567 if (!attrs[i]) 568 continue; 569 570 /* just copy - no need for translation */ 571 err = xfrm_attr_cpy32(dst, &pos, attrs[i], size, 572 nla_len(attrs[i]), nla_len(attrs[i])); 573 if (err) 574 return err; 575 } 576 return 0; 577 } 578 579 for (i = 1; i < XFRMA_MAX + 1; i++) { 580 int err; 581 582 if (i == XFRMA_PAD) 583 continue; 584 585 if (!attrs[i]) 586 continue; 587 588 err = xfrm_xlate32_attr(dst, attrs[i], &pos, size, extack); 589 if (err) 590 return err; 591 } 592 593 return 0; 594 } 595 596 static struct nlmsghdr *xfrm_user_rcv_msg_compat(const struct nlmsghdr *h32, 597 int maxtype, const struct nla_policy *policy, 598 struct netlink_ext_ack *extack) 599 { 600 /* netlink_rcv_skb() checks if a message has full (struct nlmsghdr) */ 601 u16 type = h32->nlmsg_type - XFRM_MSG_BASE; 602 struct nlattr *attrs[XFRMA_MAX+1]; 603 struct nlmsghdr *h64; 604 size_t len; 605 int err; 606 607 BUILD_BUG_ON(ARRAY_SIZE(xfrm_msg_min) != ARRAY_SIZE(compat_msg_min)); 608 609 if (type >= ARRAY_SIZE(xfrm_msg_min)) 610 return ERR_PTR(-EINVAL); 611 612 /* Don't call parse: the message might have only nlmsg header */ 613 if ((h32->nlmsg_type == XFRM_MSG_GETSA || 614 h32->nlmsg_type == XFRM_MSG_GETPOLICY) && 615 (h32->nlmsg_flags & NLM_F_DUMP)) 616 return NULL; 617 618 err = nlmsg_parse_deprecated(h32, compat_msg_min[type], attrs, 619 maxtype ? : XFRMA_MAX, policy ? : compat_policy, extack); 620 if (err < 0) 621 return ERR_PTR(err); 622 623 len = xfrm_user_rcv_calculate_len64(h32, attrs, maxtype); 624 /* The message doesn't need translation */ 625 if (len == nlmsg_len(h32)) 626 return NULL; 627 628 len += NLMSG_HDRLEN; 629 h64 = kvmalloc(len, GFP_KERNEL); 630 if (!h64) 631 return ERR_PTR(-ENOMEM); 632 633 err = xfrm_xlate32(h64, h32, attrs, len, type, maxtype, extack); 634 if (err < 0) { 635 kvfree(h64); 636 return ERR_PTR(err); 637 } 638 639 return h64; 640 } 641 642 static int xfrm_user_policy_compat(u8 **pdata32, int optlen) 643 { 644 struct compat_xfrm_userpolicy_info *p = (void *)*pdata32; 645 u8 *src_templates, *dst_templates; 646 u8 *data64; 647 648 if (optlen < sizeof(*p)) 649 return -EINVAL; 650 651 data64 = kmalloc_track_caller(optlen + 4, GFP_USER | __GFP_NOWARN); 652 if (!data64) 653 return -ENOMEM; 654 655 memcpy(data64, *pdata32, sizeof(*p)); 656 memset(data64 + sizeof(*p), 0, 4); 657 658 src_templates = *pdata32 + sizeof(*p); 659 dst_templates = data64 + sizeof(*p) + 4; 660 memcpy(dst_templates, src_templates, optlen - sizeof(*p)); 661 662 kfree(*pdata32); 663 *pdata32 = data64; 664 return 0; 665 } 666 667 static struct xfrm_translator xfrm_translator = { 668 .owner = THIS_MODULE, 669 .alloc_compat = xfrm_alloc_compat, 670 .rcv_msg_compat = xfrm_user_rcv_msg_compat, 671 .xlate_user_policy_sockptr = xfrm_user_policy_compat, 672 }; 673 674 static int __init xfrm_compat_init(void) 675 { 676 return xfrm_register_translator(&xfrm_translator); 677 } 678 679 static void __exit xfrm_compat_exit(void) 680 { 681 xfrm_unregister_translator(&xfrm_translator); 682 } 683 684 module_init(xfrm_compat_init); 685 module_exit(xfrm_compat_exit); 686 MODULE_LICENSE("GPL"); 687 MODULE_AUTHOR("Dmitry Safonov"); 688 MODULE_DESCRIPTION("XFRM 32-bit compatibility layer"); 689