1// SPDX-License-Identifier: GPL-2.0 2/* Multipath TCP 3 * 4 * Copyright (c) 2022, Intel Corporation. 5 */ 6 7#include "protocol.h" 8#include "mib.h" 9 10void mptcp_free_local_addr_list(struct mptcp_sock *msk) 11{ 12 struct mptcp_pm_addr_entry *entry, *tmp; 13 struct sock *sk = (struct sock *)msk; 14 LIST_HEAD(free_list); 15 16 if (!mptcp_pm_is_userspace(msk)) 17 return; 18 19 spin_lock_bh(&msk->pm.lock); 20 list_splice_init(&msk->pm.userspace_pm_local_addr_list, &free_list); 21 spin_unlock_bh(&msk->pm.lock); 22 23 list_for_each_entry_safe(entry, tmp, &free_list, list) { 24 sock_kfree_s(sk, entry, sizeof(*entry)); 25 } 26} 27 28static int mptcp_userspace_pm_append_new_local_addr(struct mptcp_sock *msk, 29 struct mptcp_pm_addr_entry *entry, 30 bool needs_id) 31{ 32 DECLARE_BITMAP(id_bitmap, MPTCP_PM_MAX_ADDR_ID + 1); 33 struct mptcp_pm_addr_entry *match = NULL; 34 struct sock *sk = (struct sock *)msk; 35 struct mptcp_pm_addr_entry *e; 36 bool addr_match = false; 37 bool id_match = false; 38 int ret = -EINVAL; 39 40 bitmap_zero(id_bitmap, MPTCP_PM_MAX_ADDR_ID + 1); 41 42 spin_lock_bh(&msk->pm.lock); 43 list_for_each_entry(e, &msk->pm.userspace_pm_local_addr_list, list) { 44 addr_match = mptcp_addresses_equal(&e->addr, &entry->addr, true); 45 if (addr_match && entry->addr.id == 0 && needs_id) 46 entry->addr.id = e->addr.id; 47 id_match = (e->addr.id == entry->addr.id); 48 if (addr_match && id_match) { 49 match = e; 50 break; 51 } else if (addr_match || id_match) { 52 break; 53 } 54 __set_bit(e->addr.id, id_bitmap); 55 } 56 57 if (!match && !addr_match && !id_match) { 58 /* Memory for the entry is allocated from the 59 * sock option buffer. 60 */ 61 e = sock_kmalloc(sk, sizeof(*e), GFP_ATOMIC); 62 if (!e) { 63 ret = -ENOMEM; 64 goto append_err; 65 } 66 67 *e = *entry; 68 if (!e->addr.id && needs_id) 69 e->addr.id = find_next_zero_bit(id_bitmap, 70 MPTCP_PM_MAX_ADDR_ID + 1, 71 1); 72 list_add_tail_rcu(&e->list, &msk->pm.userspace_pm_local_addr_list); 73 msk->pm.local_addr_used++; 74 ret = e->addr.id; 75 } else if (match) { 76 ret = entry->addr.id; 77 } 78 79append_err: 80 spin_unlock_bh(&msk->pm.lock); 81 return ret; 82} 83 84/* If the subflow is closed from the other peer (not via a 85 * subflow destroy command then), we want to keep the entry 86 * not to assign the same ID to another address and to be 87 * able to send RM_ADDR after the removal of the subflow. 88 */ 89static int mptcp_userspace_pm_delete_local_addr(struct mptcp_sock *msk, 90 struct mptcp_pm_addr_entry *addr) 91{ 92 struct mptcp_pm_addr_entry *entry, *tmp; 93 94 list_for_each_entry_safe(entry, tmp, &msk->pm.userspace_pm_local_addr_list, list) { 95 if (mptcp_addresses_equal(&entry->addr, &addr->addr, false)) { 96 /* TODO: a refcount is needed because the entry can 97 * be used multiple times (e.g. fullmesh mode). 98 */ 99 list_del_rcu(&entry->list); 100 kfree(entry); 101 msk->pm.local_addr_used--; 102 return 0; 103 } 104 } 105 106 return -EINVAL; 107} 108 109static struct mptcp_pm_addr_entry * 110mptcp_userspace_pm_lookup_addr_by_id(struct mptcp_sock *msk, unsigned int id) 111{ 112 struct mptcp_pm_addr_entry *entry; 113 114 list_for_each_entry(entry, &msk->pm.userspace_pm_local_addr_list, list) { 115 if (entry->addr.id == id) 116 return entry; 117 } 118 return NULL; 119} 120 121int mptcp_userspace_pm_get_flags_and_ifindex_by_id(struct mptcp_sock *msk, 122 unsigned int id, 123 u8 *flags, int *ifindex) 124{ 125 struct mptcp_pm_addr_entry *match; 126 127 spin_lock_bh(&msk->pm.lock); 128 match = mptcp_userspace_pm_lookup_addr_by_id(msk, id); 129 spin_unlock_bh(&msk->pm.lock); 130 if (match) { 131 *flags = match->flags; 132 *ifindex = match->ifindex; 133 } 134 135 return 0; 136} 137 138int mptcp_userspace_pm_get_local_id(struct mptcp_sock *msk, 139 struct mptcp_addr_info *skc) 140{ 141 struct mptcp_pm_addr_entry *entry = NULL, *e, new_entry; 142 __be16 msk_sport = ((struct inet_sock *) 143 inet_sk((struct sock *)msk))->inet_sport; 144 145 spin_lock_bh(&msk->pm.lock); 146 list_for_each_entry(e, &msk->pm.userspace_pm_local_addr_list, list) { 147 if (mptcp_addresses_equal(&e->addr, skc, false)) { 148 entry = e; 149 break; 150 } 151 } 152 spin_unlock_bh(&msk->pm.lock); 153 if (entry) 154 return entry->addr.id; 155 156 memset(&new_entry, 0, sizeof(struct mptcp_pm_addr_entry)); 157 new_entry.addr = *skc; 158 new_entry.addr.id = 0; 159 new_entry.flags = MPTCP_PM_ADDR_FLAG_IMPLICIT; 160 161 if (new_entry.addr.port == msk_sport) 162 new_entry.addr.port = 0; 163 164 return mptcp_userspace_pm_append_new_local_addr(msk, &new_entry, true); 165} 166 167int mptcp_pm_nl_announce_doit(struct sk_buff *skb, struct genl_info *info) 168{ 169 struct nlattr *token = info->attrs[MPTCP_PM_ATTR_TOKEN]; 170 struct nlattr *addr = info->attrs[MPTCP_PM_ATTR_ADDR]; 171 struct mptcp_pm_addr_entry addr_val; 172 struct mptcp_sock *msk; 173 int err = -EINVAL; 174 struct sock *sk; 175 u32 token_val; 176 177 if (!addr || !token) { 178 GENL_SET_ERR_MSG(info, "missing required inputs"); 179 return err; 180 } 181 182 token_val = nla_get_u32(token); 183 184 msk = mptcp_token_get_sock(sock_net(skb->sk), token_val); 185 if (!msk) { 186 NL_SET_ERR_MSG_ATTR(info->extack, token, "invalid token"); 187 return err; 188 } 189 190 sk = (struct sock *)msk; 191 192 if (!mptcp_pm_is_userspace(msk)) { 193 GENL_SET_ERR_MSG(info, "invalid request; userspace PM not selected"); 194 goto announce_err; 195 } 196 197 err = mptcp_pm_parse_entry(addr, info, true, &addr_val); 198 if (err < 0) { 199 GENL_SET_ERR_MSG(info, "error parsing local address"); 200 goto announce_err; 201 } 202 203 if (addr_val.addr.id == 0 || !(addr_val.flags & MPTCP_PM_ADDR_FLAG_SIGNAL)) { 204 GENL_SET_ERR_MSG(info, "invalid addr id or flags"); 205 err = -EINVAL; 206 goto announce_err; 207 } 208 209 err = mptcp_userspace_pm_append_new_local_addr(msk, &addr_val, false); 210 if (err < 0) { 211 GENL_SET_ERR_MSG(info, "did not match address and id"); 212 goto announce_err; 213 } 214 215 lock_sock(sk); 216 spin_lock_bh(&msk->pm.lock); 217 218 if (mptcp_pm_alloc_anno_list(msk, &addr_val.addr)) { 219 msk->pm.add_addr_signaled++; 220 mptcp_pm_announce_addr(msk, &addr_val.addr, false); 221 mptcp_pm_nl_addr_send_ack(msk); 222 } 223 224 spin_unlock_bh(&msk->pm.lock); 225 release_sock(sk); 226 227 err = 0; 228 announce_err: 229 sock_put(sk); 230 return err; 231} 232 233static int mptcp_userspace_pm_remove_id_zero_address(struct mptcp_sock *msk, 234 struct genl_info *info) 235{ 236 struct mptcp_rm_list list = { .nr = 0 }; 237 struct mptcp_subflow_context *subflow; 238 struct sock *sk = (struct sock *)msk; 239 bool has_id_0 = false; 240 int err = -EINVAL; 241 242 lock_sock(sk); 243 mptcp_for_each_subflow(msk, subflow) { 244 if (READ_ONCE(subflow->local_id) == 0) { 245 has_id_0 = true; 246 break; 247 } 248 } 249 if (!has_id_0) { 250 GENL_SET_ERR_MSG(info, "address with id 0 not found"); 251 goto remove_err; 252 } 253 254 list.ids[list.nr++] = 0; 255 256 spin_lock_bh(&msk->pm.lock); 257 mptcp_pm_remove_addr(msk, &list); 258 spin_unlock_bh(&msk->pm.lock); 259 260 err = 0; 261 262remove_err: 263 release_sock(sk); 264 return err; 265} 266 267int mptcp_pm_nl_remove_doit(struct sk_buff *skb, struct genl_info *info) 268{ 269 struct nlattr *token = info->attrs[MPTCP_PM_ATTR_TOKEN]; 270 struct nlattr *id = info->attrs[MPTCP_PM_ATTR_LOC_ID]; 271 struct mptcp_pm_addr_entry *match; 272 struct mptcp_pm_addr_entry *entry; 273 struct mptcp_sock *msk; 274 LIST_HEAD(free_list); 275 int err = -EINVAL; 276 struct sock *sk; 277 u32 token_val; 278 u8 id_val; 279 280 if (!id || !token) { 281 GENL_SET_ERR_MSG(info, "missing required inputs"); 282 return err; 283 } 284 285 id_val = nla_get_u8(id); 286 token_val = nla_get_u32(token); 287 288 msk = mptcp_token_get_sock(sock_net(skb->sk), token_val); 289 if (!msk) { 290 NL_SET_ERR_MSG_ATTR(info->extack, token, "invalid token"); 291 return err; 292 } 293 294 sk = (struct sock *)msk; 295 296 if (!mptcp_pm_is_userspace(msk)) { 297 GENL_SET_ERR_MSG(info, "invalid request; userspace PM not selected"); 298 goto out; 299 } 300 301 if (id_val == 0) { 302 err = mptcp_userspace_pm_remove_id_zero_address(msk, info); 303 goto out; 304 } 305 306 lock_sock(sk); 307 308 match = mptcp_userspace_pm_lookup_addr_by_id(msk, id_val); 309 if (!match) { 310 GENL_SET_ERR_MSG(info, "address with specified id not found"); 311 release_sock(sk); 312 goto out; 313 } 314 315 list_move(&match->list, &free_list); 316 317 mptcp_pm_remove_addrs(msk, &free_list); 318 319 release_sock(sk); 320 321 list_for_each_entry_safe(match, entry, &free_list, list) { 322 sock_kfree_s(sk, match, sizeof(*match)); 323 } 324 325 err = 0; 326out: 327 sock_put(sk); 328 return err; 329} 330 331int mptcp_pm_nl_subflow_create_doit(struct sk_buff *skb, struct genl_info *info) 332{ 333 struct nlattr *raddr = info->attrs[MPTCP_PM_ATTR_ADDR_REMOTE]; 334 struct nlattr *token = info->attrs[MPTCP_PM_ATTR_TOKEN]; 335 struct nlattr *laddr = info->attrs[MPTCP_PM_ATTR_ADDR]; 336 struct mptcp_pm_addr_entry local = { 0 }; 337 struct mptcp_addr_info addr_r; 338 struct mptcp_sock *msk; 339 int err = -EINVAL; 340 struct sock *sk; 341 u32 token_val; 342 343 if (!laddr || !raddr || !token) { 344 GENL_SET_ERR_MSG(info, "missing required inputs"); 345 return err; 346 } 347 348 token_val = nla_get_u32(token); 349 350 msk = mptcp_token_get_sock(genl_info_net(info), token_val); 351 if (!msk) { 352 NL_SET_ERR_MSG_ATTR(info->extack, token, "invalid token"); 353 return err; 354 } 355 356 sk = (struct sock *)msk; 357 358 if (!mptcp_pm_is_userspace(msk)) { 359 GENL_SET_ERR_MSG(info, "invalid request; userspace PM not selected"); 360 goto create_err; 361 } 362 363 err = mptcp_pm_parse_entry(laddr, info, true, &local); 364 if (err < 0) { 365 NL_SET_ERR_MSG_ATTR(info->extack, laddr, "error parsing local addr"); 366 goto create_err; 367 } 368 369 if (local.flags & MPTCP_PM_ADDR_FLAG_SIGNAL) { 370 GENL_SET_ERR_MSG(info, "invalid addr flags"); 371 err = -EINVAL; 372 goto create_err; 373 } 374 local.flags |= MPTCP_PM_ADDR_FLAG_SUBFLOW; 375 376 err = mptcp_pm_parse_addr(raddr, info, &addr_r); 377 if (err < 0) { 378 NL_SET_ERR_MSG_ATTR(info->extack, raddr, "error parsing remote addr"); 379 goto create_err; 380 } 381 382 if (!mptcp_pm_addr_families_match(sk, &local.addr, &addr_r)) { 383 GENL_SET_ERR_MSG(info, "families mismatch"); 384 err = -EINVAL; 385 goto create_err; 386 } 387 388 err = mptcp_userspace_pm_append_new_local_addr(msk, &local, false); 389 if (err < 0) { 390 GENL_SET_ERR_MSG(info, "did not match address and id"); 391 goto create_err; 392 } 393 394 lock_sock(sk); 395 396 err = __mptcp_subflow_connect(sk, &local.addr, &addr_r); 397 398 release_sock(sk); 399 400 spin_lock_bh(&msk->pm.lock); 401 if (err) 402 mptcp_userspace_pm_delete_local_addr(msk, &local); 403 else 404 msk->pm.subflows++; 405 spin_unlock_bh(&msk->pm.lock); 406 407 create_err: 408 sock_put(sk); 409 return err; 410} 411 412static struct sock *mptcp_nl_find_ssk(struct mptcp_sock *msk, 413 const struct mptcp_addr_info *local, 414 const struct mptcp_addr_info *remote) 415{ 416 struct mptcp_subflow_context *subflow; 417 418 if (local->family != remote->family) 419 return NULL; 420 421 mptcp_for_each_subflow(msk, subflow) { 422 const struct inet_sock *issk; 423 struct sock *ssk; 424 425 ssk = mptcp_subflow_tcp_sock(subflow); 426 427 if (local->family != ssk->sk_family) 428 continue; 429 430 issk = inet_sk(ssk); 431 432 switch (ssk->sk_family) { 433 case AF_INET: 434 if (issk->inet_saddr != local->addr.s_addr || 435 issk->inet_daddr != remote->addr.s_addr) 436 continue; 437 break; 438#if IS_ENABLED(CONFIG_MPTCP_IPV6) 439 case AF_INET6: { 440 const struct ipv6_pinfo *pinfo = inet6_sk(ssk); 441 442 if (!ipv6_addr_equal(&local->addr6, &pinfo->saddr) || 443 !ipv6_addr_equal(&remote->addr6, &ssk->sk_v6_daddr)) 444 continue; 445 break; 446 } 447#endif 448 default: 449 continue; 450 } 451 452 if (issk->inet_sport == local->port && 453 issk->inet_dport == remote->port) 454 return ssk; 455 } 456 457 return NULL; 458} 459 460int mptcp_pm_nl_subflow_destroy_doit(struct sk_buff *skb, struct genl_info *info) 461{ 462 struct nlattr *raddr = info->attrs[MPTCP_PM_ATTR_ADDR_REMOTE]; 463 struct nlattr *token = info->attrs[MPTCP_PM_ATTR_TOKEN]; 464 struct nlattr *laddr = info->attrs[MPTCP_PM_ATTR_ADDR]; 465 struct mptcp_addr_info addr_l; 466 struct mptcp_addr_info addr_r; 467 struct mptcp_sock *msk; 468 struct sock *sk, *ssk; 469 int err = -EINVAL; 470 u32 token_val; 471 472 if (!laddr || !raddr || !token) { 473 GENL_SET_ERR_MSG(info, "missing required inputs"); 474 return err; 475 } 476 477 token_val = nla_get_u32(token); 478 479 msk = mptcp_token_get_sock(genl_info_net(info), token_val); 480 if (!msk) { 481 NL_SET_ERR_MSG_ATTR(info->extack, token, "invalid token"); 482 return err; 483 } 484 485 sk = (struct sock *)msk; 486 487 if (!mptcp_pm_is_userspace(msk)) { 488 GENL_SET_ERR_MSG(info, "invalid request; userspace PM not selected"); 489 goto destroy_err; 490 } 491 492 err = mptcp_pm_parse_addr(laddr, info, &addr_l); 493 if (err < 0) { 494 NL_SET_ERR_MSG_ATTR(info->extack, laddr, "error parsing local addr"); 495 goto destroy_err; 496 } 497 498 err = mptcp_pm_parse_addr(raddr, info, &addr_r); 499 if (err < 0) { 500 NL_SET_ERR_MSG_ATTR(info->extack, raddr, "error parsing remote addr"); 501 goto destroy_err; 502 } 503 504#if IS_ENABLED(CONFIG_MPTCP_IPV6) 505 if (addr_l.family == AF_INET && ipv6_addr_v4mapped(&addr_r.addr6)) { 506 ipv6_addr_set_v4mapped(addr_l.addr.s_addr, &addr_l.addr6); 507 addr_l.family = AF_INET6; 508 } 509 if (addr_r.family == AF_INET && ipv6_addr_v4mapped(&addr_l.addr6)) { 510 ipv6_addr_set_v4mapped(addr_r.addr.s_addr, &addr_r.addr6); 511 addr_r.family = AF_INET6; 512 } 513#endif 514 if (addr_l.family != addr_r.family) { 515 GENL_SET_ERR_MSG(info, "address families do not match"); 516 err = -EINVAL; 517 goto destroy_err; 518 } 519 520 if (!addr_l.port || !addr_r.port) { 521 GENL_SET_ERR_MSG(info, "missing local or remote port"); 522 err = -EINVAL; 523 goto destroy_err; 524 } 525 526 lock_sock(sk); 527 ssk = mptcp_nl_find_ssk(msk, &addr_l, &addr_r); 528 if (ssk) { 529 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); 530 struct mptcp_pm_addr_entry entry = { .addr = addr_l }; 531 532 spin_lock_bh(&msk->pm.lock); 533 mptcp_userspace_pm_delete_local_addr(msk, &entry); 534 spin_unlock_bh(&msk->pm.lock); 535 mptcp_subflow_shutdown(sk, ssk, RCV_SHUTDOWN | SEND_SHUTDOWN); 536 mptcp_close_ssk(sk, ssk, subflow); 537 MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_RMSUBFLOW); 538 err = 0; 539 } else { 540 err = -ESRCH; 541 } 542 release_sock(sk); 543 544destroy_err: 545 sock_put(sk); 546 return err; 547} 548 549int mptcp_userspace_pm_set_flags(struct sk_buff *skb, struct genl_info *info) 550{ 551 struct mptcp_pm_addr_entry loc = { .addr = { .family = AF_UNSPEC }, }; 552 struct mptcp_pm_addr_entry rem = { .addr = { .family = AF_UNSPEC }, }; 553 struct nlattr *attr_rem = info->attrs[MPTCP_PM_ATTR_ADDR_REMOTE]; 554 struct nlattr *token = info->attrs[MPTCP_PM_ATTR_TOKEN]; 555 struct nlattr *attr = info->attrs[MPTCP_PM_ATTR_ADDR]; 556 struct net *net = sock_net(skb->sk); 557 struct mptcp_sock *msk; 558 int ret = -EINVAL; 559 struct sock *sk; 560 u32 token_val; 561 u8 bkup = 0; 562 563 token_val = nla_get_u32(token); 564 565 msk = mptcp_token_get_sock(net, token_val); 566 if (!msk) { 567 NL_SET_ERR_MSG_ATTR(info->extack, token, "invalid token"); 568 return ret; 569 } 570 571 sk = (struct sock *)msk; 572 573 if (!mptcp_pm_is_userspace(msk)) { 574 GENL_SET_ERR_MSG(info, "userspace PM not selected"); 575 goto set_flags_err; 576 } 577 578 ret = mptcp_pm_parse_entry(attr, info, false, &loc); 579 if (ret < 0) 580 goto set_flags_err; 581 582 if (attr_rem) { 583 ret = mptcp_pm_parse_entry(attr_rem, info, false, &rem); 584 if (ret < 0) 585 goto set_flags_err; 586 } 587 588 if (loc.addr.family == AF_UNSPEC || 589 rem.addr.family == AF_UNSPEC) { 590 GENL_SET_ERR_MSG(info, "invalid address families"); 591 ret = -EINVAL; 592 goto set_flags_err; 593 } 594 595 if (loc.flags & MPTCP_PM_ADDR_FLAG_BACKUP) 596 bkup = 1; 597 598 lock_sock(sk); 599 ret = mptcp_pm_nl_mp_prio_send_ack(msk, &loc.addr, &rem.addr, bkup); 600 release_sock(sk); 601 602set_flags_err: 603 sock_put(sk); 604 return ret; 605} 606 607int mptcp_userspace_pm_dump_addr(struct sk_buff *msg, 608 struct netlink_callback *cb) 609{ 610 struct id_bitmap { 611 DECLARE_BITMAP(map, MPTCP_PM_MAX_ADDR_ID + 1); 612 } *bitmap; 613 const struct genl_info *info = genl_info_dump(cb); 614 struct net *net = sock_net(msg->sk); 615 struct mptcp_pm_addr_entry *entry; 616 struct mptcp_sock *msk; 617 struct nlattr *token; 618 int ret = -EINVAL; 619 struct sock *sk; 620 void *hdr; 621 622 bitmap = (struct id_bitmap *)cb->ctx; 623 token = info->attrs[MPTCP_PM_ATTR_TOKEN]; 624 625 msk = mptcp_token_get_sock(net, nla_get_u32(token)); 626 if (!msk) { 627 NL_SET_ERR_MSG_ATTR(info->extack, token, "invalid token"); 628 return ret; 629 } 630 631 sk = (struct sock *)msk; 632 633 if (!mptcp_pm_is_userspace(msk)) { 634 GENL_SET_ERR_MSG(info, "invalid request; userspace PM not selected"); 635 goto out; 636 } 637 638 lock_sock(sk); 639 spin_lock_bh(&msk->pm.lock); 640 list_for_each_entry(entry, &msk->pm.userspace_pm_local_addr_list, list) { 641 if (test_bit(entry->addr.id, bitmap->map)) 642 continue; 643 644 hdr = genlmsg_put(msg, NETLINK_CB(cb->skb).portid, 645 cb->nlh->nlmsg_seq, &mptcp_genl_family, 646 NLM_F_MULTI, MPTCP_PM_CMD_GET_ADDR); 647 if (!hdr) 648 break; 649 650 if (mptcp_nl_fill_addr(msg, entry) < 0) { 651 genlmsg_cancel(msg, hdr); 652 break; 653 } 654 655 __set_bit(entry->addr.id, bitmap->map); 656 genlmsg_end(msg, hdr); 657 } 658 spin_unlock_bh(&msk->pm.lock); 659 release_sock(sk); 660 ret = msg->len; 661 662out: 663 sock_put(sk); 664 return ret; 665} 666 667int mptcp_userspace_pm_get_addr(struct sk_buff *skb, 668 struct genl_info *info) 669{ 670 struct nlattr *attr = info->attrs[MPTCP_PM_ENDPOINT_ADDR]; 671 struct nlattr *token = info->attrs[MPTCP_PM_ATTR_TOKEN]; 672 struct mptcp_pm_addr_entry addr, *entry; 673 struct net *net = sock_net(skb->sk); 674 struct mptcp_sock *msk; 675 struct sk_buff *msg; 676 int ret = -EINVAL; 677 struct sock *sk; 678 void *reply; 679 680 msk = mptcp_token_get_sock(net, nla_get_u32(token)); 681 if (!msk) { 682 NL_SET_ERR_MSG_ATTR(info->extack, token, "invalid token"); 683 return ret; 684 } 685 686 sk = (struct sock *)msk; 687 688 if (!mptcp_pm_is_userspace(msk)) { 689 GENL_SET_ERR_MSG(info, "invalid request; userspace PM not selected"); 690 goto out; 691 } 692 693 ret = mptcp_pm_parse_entry(attr, info, false, &addr); 694 if (ret < 0) 695 goto out; 696 697 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 698 if (!msg) { 699 ret = -ENOMEM; 700 goto out; 701 } 702 703 reply = genlmsg_put_reply(msg, info, &mptcp_genl_family, 0, 704 info->genlhdr->cmd); 705 if (!reply) { 706 GENL_SET_ERR_MSG(info, "not enough space in Netlink message"); 707 ret = -EMSGSIZE; 708 goto fail; 709 } 710 711 lock_sock(sk); 712 spin_lock_bh(&msk->pm.lock); 713 entry = mptcp_userspace_pm_lookup_addr_by_id(msk, addr.addr.id); 714 if (!entry) { 715 GENL_SET_ERR_MSG(info, "address not found"); 716 ret = -EINVAL; 717 goto unlock_fail; 718 } 719 720 ret = mptcp_nl_fill_addr(msg, entry); 721 if (ret) 722 goto unlock_fail; 723 724 genlmsg_end(msg, reply); 725 ret = genlmsg_reply(msg, info); 726 spin_unlock_bh(&msk->pm.lock); 727 release_sock(sk); 728 sock_put(sk); 729 return ret; 730 731unlock_fail: 732 spin_unlock_bh(&msk->pm.lock); 733 release_sock(sk); 734fail: 735 nlmsg_free(msg); 736out: 737 sock_put(sk); 738 return ret; 739} 740