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 return xfrm_nla_cpy(dst, src, nla_len(src)); 288 default: 289 BUILD_BUG_ON(XFRMA_MAX != XFRMA_SA_PCPU); 290 pr_warn_once("unsupported nla_type %d\n", src->nla_type); 291 return -EOPNOTSUPP; 292 } 293 } 294 295 /* Take kernel-built (64bit layout) and create 32bit layout for userspace */ 296 static int xfrm_xlate64(struct sk_buff *dst, const struct nlmsghdr *nlh_src) 297 { 298 u16 type = nlh_src->nlmsg_type - XFRM_MSG_BASE; 299 const struct nlattr *nla, *attrs; 300 struct nlmsghdr *nlh_dst; 301 int len, remaining; 302 303 nlh_dst = xfrm_nlmsg_put_compat(dst, nlh_src, type); 304 if (IS_ERR(nlh_dst)) 305 return PTR_ERR(nlh_dst); 306 307 attrs = nlmsg_attrdata(nlh_src, xfrm_msg_min[type]); 308 len = nlmsg_attrlen(nlh_src, xfrm_msg_min[type]); 309 310 nla_for_each_attr(nla, attrs, len, remaining) { 311 int err; 312 313 switch (nlh_src->nlmsg_type) { 314 case XFRM_MSG_NEWSPDINFO: 315 err = xfrm_nla_cpy(dst, nla, nla_len(nla)); 316 break; 317 default: 318 err = xfrm_xlate64_attr(dst, nla); 319 break; 320 } 321 if (err) 322 return err; 323 } 324 325 nlmsg_end(dst, nlh_dst); 326 327 return 0; 328 } 329 330 static int xfrm_alloc_compat(struct sk_buff *skb, const struct nlmsghdr *nlh_src) 331 { 332 u16 type = nlh_src->nlmsg_type - XFRM_MSG_BASE; 333 struct sk_buff *new = NULL; 334 int err; 335 336 if (type >= ARRAY_SIZE(xfrm_msg_min)) { 337 pr_warn_once("unsupported nlmsg_type %d\n", nlh_src->nlmsg_type); 338 return -EOPNOTSUPP; 339 } 340 341 if (skb_shinfo(skb)->frag_list == NULL) { 342 new = alloc_skb(skb->len + skb_tailroom(skb), GFP_ATOMIC); 343 if (!new) 344 return -ENOMEM; 345 skb_shinfo(skb)->frag_list = new; 346 } 347 348 err = xfrm_xlate64(skb_shinfo(skb)->frag_list, nlh_src); 349 if (err) { 350 if (new) { 351 kfree_skb(new); 352 skb_shinfo(skb)->frag_list = NULL; 353 } 354 return err; 355 } 356 357 return 0; 358 } 359 360 /* Calculates len of translated 64-bit message. */ 361 static size_t xfrm_user_rcv_calculate_len64(const struct nlmsghdr *src, 362 struct nlattr *attrs[XFRMA_MAX + 1], 363 int maxtype) 364 { 365 size_t len = nlmsg_len(src); 366 367 switch (src->nlmsg_type) { 368 case XFRM_MSG_NEWSA: 369 case XFRM_MSG_NEWPOLICY: 370 case XFRM_MSG_ALLOCSPI: 371 case XFRM_MSG_ACQUIRE: 372 case XFRM_MSG_UPDPOLICY: 373 case XFRM_MSG_UPDSA: 374 len += 4; 375 break; 376 case XFRM_MSG_EXPIRE: 377 case XFRM_MSG_POLEXPIRE: 378 len += 8; 379 break; 380 case XFRM_MSG_NEWSPDINFO: 381 /* attirbutes are xfrm_spdattr_type_t, not xfrm_attr_type_t */ 382 return len; 383 default: 384 break; 385 } 386 387 /* Unexpected for anything, but XFRM_MSG_NEWSPDINFO, please 388 * correct both 64=>32-bit and 32=>64-bit translators to copy 389 * new attributes. 390 */ 391 if (WARN_ON_ONCE(maxtype)) 392 return len; 393 394 if (attrs[XFRMA_SA]) 395 len += 4; 396 if (attrs[XFRMA_POLICY]) 397 len += 4; 398 399 /* XXX: some attrs may need to be realigned 400 * if !CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS 401 */ 402 403 return len; 404 } 405 406 static int xfrm_attr_cpy32(void *dst, size_t *pos, const struct nlattr *src, 407 size_t size, int copy_len, int payload) 408 { 409 struct nlmsghdr *nlmsg = dst; 410 struct nlattr *nla; 411 412 /* xfrm_user_rcv_msg_compat() relies on fact that 32-bit messages 413 * have the same len or shorted than 64-bit ones. 414 * 32-bit translation that is bigger than 64-bit original is unexpected. 415 */ 416 if (WARN_ON_ONCE(copy_len > payload)) 417 copy_len = payload; 418 419 if (size - *pos < nla_attr_size(payload)) 420 return -ENOBUFS; 421 422 nla = dst + *pos; 423 424 memcpy(nla, src, nla_attr_size(copy_len)); 425 nla->nla_len = nla_attr_size(payload); 426 *pos += nla_attr_size(copy_len); 427 nlmsg->nlmsg_len += nla->nla_len; 428 429 memset(dst + *pos, 0, payload - copy_len); 430 *pos += payload - copy_len; 431 432 return 0; 433 } 434 435 static int xfrm_xlate32_attr(void *dst, const struct nlattr *nla, 436 size_t *pos, size_t size, 437 struct netlink_ext_ack *extack) 438 { 439 int type = nla_type(nla); 440 u16 pol_len32, pol_len64; 441 int err; 442 443 if (type > XFRMA_MAX) { 444 BUILD_BUG_ON(XFRMA_MAX != XFRMA_SA_PCPU); 445 NL_SET_ERR_MSG(extack, "Bad attribute"); 446 return -EOPNOTSUPP; 447 } 448 type = array_index_nospec(type, XFRMA_MAX + 1); 449 if (nla_len(nla) < compat_policy[type].len) { 450 NL_SET_ERR_MSG(extack, "Attribute bad length"); 451 return -EOPNOTSUPP; 452 } 453 454 pol_len32 = compat_policy[type].len; 455 pol_len64 = xfrma_policy[type].len; 456 457 /* XFRMA_SA and XFRMA_POLICY - need to know how-to translate */ 458 if (pol_len32 != pol_len64) { 459 if (nla_len(nla) != compat_policy[type].len) { 460 NL_SET_ERR_MSG(extack, "Attribute bad length"); 461 return -EOPNOTSUPP; 462 } 463 err = xfrm_attr_cpy32(dst, pos, nla, size, pol_len32, pol_len64); 464 if (err) 465 return err; 466 } 467 468 return xfrm_attr_cpy32(dst, pos, nla, size, nla_len(nla), nla_len(nla)); 469 } 470 471 static int xfrm_xlate32(struct nlmsghdr *dst, const struct nlmsghdr *src, 472 struct nlattr *attrs[XFRMA_MAX+1], 473 size_t size, u8 type, int maxtype, 474 struct netlink_ext_ack *extack) 475 { 476 size_t pos; 477 int i; 478 479 memcpy(dst, src, NLMSG_HDRLEN); 480 dst->nlmsg_len = NLMSG_HDRLEN + xfrm_msg_min[type]; 481 memset(nlmsg_data(dst), 0, xfrm_msg_min[type]); 482 483 switch (src->nlmsg_type) { 484 /* Compat message has the same layout as native */ 485 case XFRM_MSG_DELSA: 486 case XFRM_MSG_GETSA: 487 case XFRM_MSG_DELPOLICY: 488 case XFRM_MSG_GETPOLICY: 489 case XFRM_MSG_FLUSHSA: 490 case XFRM_MSG_FLUSHPOLICY: 491 case XFRM_MSG_NEWAE: 492 case XFRM_MSG_GETAE: 493 case XFRM_MSG_REPORT: 494 case XFRM_MSG_MIGRATE: 495 case XFRM_MSG_NEWSADINFO: 496 case XFRM_MSG_GETSADINFO: 497 case XFRM_MSG_NEWSPDINFO: 498 case XFRM_MSG_GETSPDINFO: 499 case XFRM_MSG_MAPPING: 500 memcpy(nlmsg_data(dst), nlmsg_data(src), compat_msg_min[type]); 501 break; 502 /* 4 byte alignment for trailing u64 on native, but not on compat */ 503 case XFRM_MSG_NEWSA: 504 case XFRM_MSG_NEWPOLICY: 505 case XFRM_MSG_UPDSA: 506 case XFRM_MSG_UPDPOLICY: 507 memcpy(nlmsg_data(dst), nlmsg_data(src), compat_msg_min[type]); 508 break; 509 case XFRM_MSG_EXPIRE: { 510 const struct compat_xfrm_user_expire *src_ue = nlmsg_data(src); 511 struct xfrm_user_expire *dst_ue = nlmsg_data(dst); 512 513 /* compat_xfrm_user_expire has 4-byte smaller state */ 514 memcpy(dst_ue, src_ue, sizeof(src_ue->state)); 515 dst_ue->hard = src_ue->hard; 516 break; 517 } 518 case XFRM_MSG_ACQUIRE: { 519 const struct compat_xfrm_user_acquire *src_ua = nlmsg_data(src); 520 struct xfrm_user_acquire *dst_ua = nlmsg_data(dst); 521 522 memcpy(dst_ua, src_ua, offsetof(struct compat_xfrm_user_acquire, aalgos)); 523 dst_ua->aalgos = src_ua->aalgos; 524 dst_ua->ealgos = src_ua->ealgos; 525 dst_ua->calgos = src_ua->calgos; 526 dst_ua->seq = src_ua->seq; 527 break; 528 } 529 case XFRM_MSG_POLEXPIRE: { 530 const struct compat_xfrm_user_polexpire *src_upe = nlmsg_data(src); 531 struct xfrm_user_polexpire *dst_upe = nlmsg_data(dst); 532 533 /* compat_xfrm_user_polexpire has 4-byte smaller state */ 534 memcpy(dst_upe, src_upe, sizeof(src_upe->pol)); 535 dst_upe->hard = src_upe->hard; 536 break; 537 } 538 case XFRM_MSG_ALLOCSPI: { 539 const struct compat_xfrm_userspi_info *src_usi = nlmsg_data(src); 540 struct xfrm_userspi_info *dst_usi = nlmsg_data(dst); 541 542 /* compat_xfrm_user_polexpire has 4-byte smaller state */ 543 memcpy(dst_usi, src_usi, sizeof(src_usi->info)); 544 dst_usi->min = src_usi->min; 545 dst_usi->max = src_usi->max; 546 break; 547 } 548 default: 549 NL_SET_ERR_MSG(extack, "Unsupported message type"); 550 return -EOPNOTSUPP; 551 } 552 pos = dst->nlmsg_len; 553 554 if (maxtype) { 555 /* attirbutes are xfrm_spdattr_type_t, not xfrm_attr_type_t */ 556 WARN_ON_ONCE(src->nlmsg_type != XFRM_MSG_NEWSPDINFO); 557 558 for (i = 1; i <= maxtype; i++) { 559 int err; 560 561 if (!attrs[i]) 562 continue; 563 564 /* just copy - no need for translation */ 565 err = xfrm_attr_cpy32(dst, &pos, attrs[i], size, 566 nla_len(attrs[i]), nla_len(attrs[i])); 567 if (err) 568 return err; 569 } 570 return 0; 571 } 572 573 for (i = 1; i < XFRMA_MAX + 1; i++) { 574 int err; 575 576 if (i == XFRMA_PAD) 577 continue; 578 579 if (!attrs[i]) 580 continue; 581 582 err = xfrm_xlate32_attr(dst, attrs[i], &pos, size, extack); 583 if (err) 584 return err; 585 } 586 587 return 0; 588 } 589 590 static struct nlmsghdr *xfrm_user_rcv_msg_compat(const struct nlmsghdr *h32, 591 int maxtype, const struct nla_policy *policy, 592 struct netlink_ext_ack *extack) 593 { 594 /* netlink_rcv_skb() checks if a message has full (struct nlmsghdr) */ 595 u16 type = h32->nlmsg_type - XFRM_MSG_BASE; 596 struct nlattr *attrs[XFRMA_MAX+1]; 597 struct nlmsghdr *h64; 598 size_t len; 599 int err; 600 601 BUILD_BUG_ON(ARRAY_SIZE(xfrm_msg_min) != ARRAY_SIZE(compat_msg_min)); 602 603 if (type >= ARRAY_SIZE(xfrm_msg_min)) 604 return ERR_PTR(-EINVAL); 605 606 /* Don't call parse: the message might have only nlmsg header */ 607 if ((h32->nlmsg_type == XFRM_MSG_GETSA || 608 h32->nlmsg_type == XFRM_MSG_GETPOLICY) && 609 (h32->nlmsg_flags & NLM_F_DUMP)) 610 return NULL; 611 612 err = nlmsg_parse_deprecated(h32, compat_msg_min[type], attrs, 613 maxtype ? : XFRMA_MAX, policy ? : compat_policy, extack); 614 if (err < 0) 615 return ERR_PTR(err); 616 617 len = xfrm_user_rcv_calculate_len64(h32, attrs, maxtype); 618 /* The message doesn't need translation */ 619 if (len == nlmsg_len(h32)) 620 return NULL; 621 622 len += NLMSG_HDRLEN; 623 h64 = kvmalloc(len, GFP_KERNEL); 624 if (!h64) 625 return ERR_PTR(-ENOMEM); 626 627 err = xfrm_xlate32(h64, h32, attrs, len, type, maxtype, extack); 628 if (err < 0) { 629 kvfree(h64); 630 return ERR_PTR(err); 631 } 632 633 return h64; 634 } 635 636 static int xfrm_user_policy_compat(u8 **pdata32, int optlen) 637 { 638 struct compat_xfrm_userpolicy_info *p = (void *)*pdata32; 639 u8 *src_templates, *dst_templates; 640 u8 *data64; 641 642 if (optlen < sizeof(*p)) 643 return -EINVAL; 644 645 data64 = kmalloc_track_caller(optlen + 4, GFP_USER | __GFP_NOWARN); 646 if (!data64) 647 return -ENOMEM; 648 649 memcpy(data64, *pdata32, sizeof(*p)); 650 memset(data64 + sizeof(*p), 0, 4); 651 652 src_templates = *pdata32 + sizeof(*p); 653 dst_templates = data64 + sizeof(*p) + 4; 654 memcpy(dst_templates, src_templates, optlen - sizeof(*p)); 655 656 kfree(*pdata32); 657 *pdata32 = data64; 658 return 0; 659 } 660 661 static struct xfrm_translator xfrm_translator = { 662 .owner = THIS_MODULE, 663 .alloc_compat = xfrm_alloc_compat, 664 .rcv_msg_compat = xfrm_user_rcv_msg_compat, 665 .xlate_user_policy_sockptr = xfrm_user_policy_compat, 666 }; 667 668 static int __init xfrm_compat_init(void) 669 { 670 return xfrm_register_translator(&xfrm_translator); 671 } 672 673 static void __exit xfrm_compat_exit(void) 674 { 675 xfrm_unregister_translator(&xfrm_translator); 676 } 677 678 module_init(xfrm_compat_init); 679 module_exit(xfrm_compat_exit); 680 MODULE_LICENSE("GPL"); 681 MODULE_AUTHOR("Dmitry Safonov"); 682 MODULE_DESCRIPTION("XFRM 32-bit compatibility layer"); 683