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