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 #include "mptcp_pm_gen.h" 10 11 #define mptcp_for_each_userspace_pm_addr(__msk, __entry) \ 12 list_for_each_entry(__entry, \ 13 &((__msk)->pm.userspace_pm_local_addr_list), list) 14 15 void mptcp_userspace_pm_free_local_addr_list(struct mptcp_sock *msk) 16 { 17 struct mptcp_pm_addr_entry *entry, *tmp; 18 struct sock *sk = (struct sock *)msk; 19 LIST_HEAD(free_list); 20 21 spin_lock_bh(&msk->pm.lock); 22 list_splice_init(&msk->pm.userspace_pm_local_addr_list, &free_list); 23 spin_unlock_bh(&msk->pm.lock); 24 25 list_for_each_entry_safe(entry, tmp, &free_list, list) { 26 sock_kfree_s(sk, entry, sizeof(*entry)); 27 } 28 } 29 30 static struct mptcp_pm_addr_entry * 31 mptcp_userspace_pm_lookup_addr(struct mptcp_sock *msk, 32 const struct mptcp_addr_info *addr) 33 { 34 struct mptcp_pm_addr_entry *entry; 35 36 mptcp_for_each_userspace_pm_addr(msk, entry) { 37 if (mptcp_addresses_equal(&entry->addr, addr, false)) 38 return entry; 39 } 40 return NULL; 41 } 42 43 static int mptcp_userspace_pm_append_new_local_addr(struct mptcp_sock *msk, 44 struct mptcp_pm_addr_entry *entry, 45 bool needs_id) 46 { 47 DECLARE_BITMAP(id_bitmap, MPTCP_PM_MAX_ADDR_ID + 1); 48 struct sock *sk = (struct sock *)msk; 49 struct mptcp_pm_addr_entry *e; 50 bool addr_match = false; 51 bool id_match = false; 52 int ret = -EINVAL; 53 54 bitmap_zero(id_bitmap, MPTCP_PM_MAX_ADDR_ID + 1); 55 56 spin_lock_bh(&msk->pm.lock); 57 if (msk->pm.status & BIT(MPTCP_PM_DESTROYING)) { 58 ret = -EINVAL; 59 goto append_err; 60 } 61 mptcp_for_each_userspace_pm_addr(msk, e) { 62 addr_match = mptcp_addresses_equal(&e->addr, &entry->addr, true); 63 if (addr_match && entry->addr.id == 0 && needs_id) 64 entry->addr.id = e->addr.id; 65 id_match = (e->addr.id == entry->addr.id); 66 if (addr_match || id_match) 67 break; 68 __set_bit(e->addr.id, id_bitmap); 69 } 70 71 if (!addr_match && !id_match) { 72 /* Memory for the entry is allocated from the 73 * sock option buffer. 74 */ 75 e = sock_kmemdup(sk, entry, sizeof(*entry), GFP_ATOMIC); 76 if (!e) { 77 ret = -ENOMEM; 78 goto append_err; 79 } 80 81 if (!e->addr.id && needs_id) 82 e->addr.id = find_next_zero_bit(id_bitmap, 83 MPTCP_PM_MAX_ADDR_ID + 1, 84 1); 85 list_add_tail_rcu(&e->list, &msk->pm.userspace_pm_local_addr_list); 86 msk->pm.local_addr_used++; 87 ret = e->addr.id; 88 } else if (addr_match && id_match) { 89 ret = entry->addr.id; 90 } 91 92 append_err: 93 spin_unlock_bh(&msk->pm.lock); 94 return ret; 95 } 96 97 /* If the subflow is closed from the other peer (not via a 98 * subflow destroy command then), we want to keep the entry 99 * not to assign the same ID to another address and to be 100 * able to send RM_ADDR after the removal of the subflow. 101 */ 102 static int mptcp_userspace_pm_delete_local_addr(struct mptcp_sock *msk, 103 struct mptcp_pm_addr_entry *addr) 104 { 105 struct sock *sk = (struct sock *)msk; 106 struct mptcp_pm_addr_entry *entry; 107 108 entry = mptcp_userspace_pm_lookup_addr(msk, &addr->addr); 109 if (!entry) 110 return -EINVAL; 111 112 /* TODO: a refcount is needed because the entry can 113 * be used multiple times (e.g. fullmesh mode). 114 */ 115 list_del_rcu(&entry->list); 116 sock_kfree_s(sk, entry, sizeof(*entry)); 117 msk->pm.local_addr_used--; 118 return 0; 119 } 120 121 static struct mptcp_pm_addr_entry * 122 mptcp_userspace_pm_lookup_addr_by_id(struct mptcp_sock *msk, unsigned int id) 123 { 124 struct mptcp_pm_addr_entry *entry; 125 126 mptcp_for_each_userspace_pm_addr(msk, entry) { 127 if (entry->addr.id == id) 128 return entry; 129 } 130 return NULL; 131 } 132 133 int mptcp_userspace_pm_get_local_id(struct mptcp_sock *msk, 134 struct mptcp_pm_addr_entry *skc) 135 { 136 __be16 msk_sport = ((struct inet_sock *) 137 inet_sk((struct sock *)msk))->inet_sport; 138 struct mptcp_pm_addr_entry *entry; 139 int id; 140 141 spin_lock_bh(&msk->pm.lock); 142 entry = mptcp_userspace_pm_lookup_addr(msk, &skc->addr); 143 id = entry ? entry->addr.id : -1; 144 spin_unlock_bh(&msk->pm.lock); 145 146 if (id != -1) 147 return id; 148 149 if (skc->addr.port == msk_sport) 150 skc->addr.port = 0; 151 152 return mptcp_userspace_pm_append_new_local_addr(msk, skc, true); 153 } 154 155 bool mptcp_userspace_pm_is_backup(struct mptcp_sock *msk, 156 struct mptcp_addr_info *skc) 157 { 158 struct mptcp_pm_addr_entry *entry; 159 bool backup; 160 161 spin_lock_bh(&msk->pm.lock); 162 entry = mptcp_userspace_pm_lookup_addr(msk, skc); 163 backup = entry && !!(entry->flags & MPTCP_PM_ADDR_FLAG_BACKUP); 164 spin_unlock_bh(&msk->pm.lock); 165 166 return backup; 167 } 168 169 static struct mptcp_sock *mptcp_userspace_pm_get_sock(const struct genl_info *info) 170 { 171 struct mptcp_sock *msk; 172 struct nlattr *token; 173 174 if (GENL_REQ_ATTR_CHECK(info, MPTCP_PM_ATTR_TOKEN)) 175 return NULL; 176 177 token = info->attrs[MPTCP_PM_ATTR_TOKEN]; 178 msk = mptcp_token_get_sock(genl_info_net(info), nla_get_u32(token)); 179 if (!msk) { 180 NL_SET_ERR_MSG_ATTR(info->extack, token, "invalid token"); 181 return NULL; 182 } 183 184 if (!mptcp_pm_is_userspace(msk)) { 185 NL_SET_ERR_MSG_ATTR(info->extack, token, 186 "userspace PM not selected"); 187 sock_put((struct sock *)msk); 188 return NULL; 189 } 190 191 return msk; 192 } 193 194 int mptcp_pm_nl_announce_doit(struct sk_buff *skb, struct genl_info *info) 195 { 196 struct mptcp_pm_addr_entry addr_val; 197 struct mptcp_sock *msk; 198 struct nlattr *addr; 199 int err = -EINVAL; 200 struct sock *sk; 201 202 if (GENL_REQ_ATTR_CHECK(info, MPTCP_PM_ATTR_ADDR)) 203 return err; 204 205 msk = mptcp_userspace_pm_get_sock(info); 206 if (!msk) 207 return err; 208 209 sk = (struct sock *)msk; 210 211 addr = info->attrs[MPTCP_PM_ATTR_ADDR]; 212 err = mptcp_pm_parse_entry(addr, info, true, &addr_val); 213 if (err < 0) 214 goto announce_err; 215 216 if (addr_val.addr.id == 0) { 217 NL_SET_ERR_MSG_ATTR(info->extack, addr, "invalid addr id"); 218 err = -EINVAL; 219 goto announce_err; 220 } 221 222 if (!(addr_val.flags & MPTCP_PM_ADDR_FLAG_SIGNAL)) { 223 NL_SET_ERR_MSG_ATTR(info->extack, addr, "invalid addr flags"); 224 err = -EINVAL; 225 goto announce_err; 226 } 227 228 err = mptcp_userspace_pm_append_new_local_addr(msk, &addr_val, false); 229 if (err < 0) { 230 NL_SET_ERR_MSG_ATTR(info->extack, addr, 231 "did not match address and id"); 232 goto announce_err; 233 } 234 235 lock_sock(sk); 236 spin_lock_bh(&msk->pm.lock); 237 238 if (mptcp_pm_announced_alloc(msk, &addr_val.addr)) { 239 msk->pm.add_addr_signaled++; 240 mptcp_pm_announce_addr(msk, &addr_val.addr, false); 241 mptcp_pm_addr_send_ack(msk); 242 } 243 244 spin_unlock_bh(&msk->pm.lock); 245 release_sock(sk); 246 247 err = 0; 248 announce_err: 249 sock_put(sk); 250 return err; 251 } 252 253 static int mptcp_userspace_pm_remove_id_zero_address(struct mptcp_sock *msk) 254 { 255 struct mptcp_rm_list list = { .nr = 0 }; 256 struct mptcp_subflow_context *subflow; 257 struct sock *sk = (struct sock *)msk; 258 bool has_id_0 = false; 259 int err = -EINVAL; 260 261 lock_sock(sk); 262 mptcp_for_each_subflow(msk, subflow) { 263 if (READ_ONCE(subflow->local_id) == 0) { 264 has_id_0 = true; 265 break; 266 } 267 } 268 if (!has_id_0) 269 goto remove_err; 270 271 list.ids[list.nr++] = 0; 272 273 spin_lock_bh(&msk->pm.lock); 274 mptcp_pm_remove_addr(msk, &list); 275 spin_unlock_bh(&msk->pm.lock); 276 277 err = 0; 278 279 remove_err: 280 release_sock(sk); 281 return err; 282 } 283 284 void mptcp_pm_remove_addr_entry(struct mptcp_sock *msk, 285 struct mptcp_pm_addr_entry *entry) 286 { 287 struct mptcp_rm_list alist = { .nr = 0 }; 288 int anno_nr = 0; 289 290 /* only delete if either announced or matching a subflow */ 291 if (mptcp_pm_announced_remove(msk, &entry->addr)) 292 anno_nr++; 293 else if (!mptcp_pm_has_subflow_saddr(msk, &entry->addr)) 294 return; 295 296 alist.ids[alist.nr++] = entry->addr.id; 297 298 spin_lock_bh(&msk->pm.lock); 299 msk->pm.add_addr_signaled -= anno_nr; 300 mptcp_pm_remove_addr(msk, &alist); 301 spin_unlock_bh(&msk->pm.lock); 302 } 303 304 int mptcp_pm_nl_remove_doit(struct sk_buff *skb, struct genl_info *info) 305 { 306 struct mptcp_pm_addr_entry *match; 307 struct mptcp_sock *msk; 308 struct nlattr *id; 309 int err = -EINVAL; 310 struct sock *sk; 311 u8 id_val; 312 313 if (GENL_REQ_ATTR_CHECK(info, MPTCP_PM_ATTR_LOC_ID)) 314 return err; 315 316 id = info->attrs[MPTCP_PM_ATTR_LOC_ID]; 317 id_val = nla_get_u8(id); 318 319 msk = mptcp_userspace_pm_get_sock(info); 320 if (!msk) 321 return err; 322 323 sk = (struct sock *)msk; 324 325 if (id_val == 0) { 326 err = mptcp_userspace_pm_remove_id_zero_address(msk); 327 goto out; 328 } 329 330 lock_sock(sk); 331 332 spin_lock_bh(&msk->pm.lock); 333 match = mptcp_userspace_pm_lookup_addr_by_id(msk, id_val); 334 if (!match) { 335 spin_unlock_bh(&msk->pm.lock); 336 release_sock(sk); 337 goto out; 338 } 339 340 list_del_rcu(&match->list); 341 spin_unlock_bh(&msk->pm.lock); 342 343 mptcp_pm_remove_addr_entry(msk, match); 344 345 release_sock(sk); 346 347 kfree_rcu_mightsleep(match); 348 /* Adjust sk_omem_alloc like sock_kfree_s() does, to match 349 * with allocation of this memory by sock_kmemdup() 350 */ 351 atomic_sub(sizeof(*match), &sk->sk_omem_alloc); 352 353 err = 0; 354 out: 355 if (err) 356 NL_SET_ERR_MSG_ATTR_FMT(info->extack, id, 357 "address with id %u not found", 358 id_val); 359 360 sock_put(sk); 361 return err; 362 } 363 364 int mptcp_pm_nl_subflow_create_doit(struct sk_buff *skb, struct genl_info *info) 365 { 366 struct mptcp_pm_addr_entry entry = { 0 }; 367 struct mptcp_addr_info addr_r; 368 struct nlattr *raddr, *laddr; 369 struct mptcp_pm_local local; 370 struct mptcp_sock *msk; 371 int err = -EINVAL; 372 struct sock *sk; 373 374 if (GENL_REQ_ATTR_CHECK(info, MPTCP_PM_ATTR_ADDR) || 375 GENL_REQ_ATTR_CHECK(info, MPTCP_PM_ATTR_ADDR_REMOTE)) 376 return err; 377 378 msk = mptcp_userspace_pm_get_sock(info); 379 if (!msk) 380 return err; 381 382 sk = (struct sock *)msk; 383 384 laddr = info->attrs[MPTCP_PM_ATTR_ADDR]; 385 err = mptcp_pm_parse_entry(laddr, info, true, &entry); 386 if (err < 0) 387 goto create_err; 388 389 if (entry.flags & MPTCP_PM_ADDR_FLAG_SIGNAL) { 390 NL_SET_ERR_MSG_ATTR(info->extack, laddr, "invalid addr flags"); 391 err = -EINVAL; 392 goto create_err; 393 } 394 entry.flags |= MPTCP_PM_ADDR_FLAG_SUBFLOW; 395 396 raddr = info->attrs[MPTCP_PM_ATTR_ADDR_REMOTE]; 397 err = mptcp_pm_parse_addr(raddr, info, &addr_r); 398 if (err < 0) 399 goto create_err; 400 401 if (!mptcp_pm_addr_families_match(sk, &entry.addr, &addr_r)) { 402 GENL_SET_ERR_MSG(info, "families mismatch"); 403 err = -EINVAL; 404 goto create_err; 405 } 406 407 err = mptcp_userspace_pm_append_new_local_addr(msk, &entry, false); 408 if (err < 0) { 409 NL_SET_ERR_MSG_ATTR(info->extack, laddr, 410 "did not match address and id"); 411 goto create_err; 412 } 413 414 local.addr = entry.addr; 415 local.flags = entry.flags; 416 local.ifindex = entry.ifindex; 417 418 spin_lock_bh(&msk->pm.lock); 419 msk->pm.extra_subflows++; 420 spin_unlock_bh(&msk->pm.lock); 421 422 lock_sock(sk); 423 err = __mptcp_subflow_connect(sk, &local, &addr_r); 424 release_sock(sk); 425 426 if (err) { 427 GENL_SET_ERR_MSG_FMT(info, "connect error: %d", err); 428 429 spin_lock_bh(&msk->pm.lock); 430 mptcp_userspace_pm_delete_local_addr(msk, &entry); 431 spin_unlock_bh(&msk->pm.lock); 432 } 433 434 create_err: 435 sock_put(sk); 436 return err; 437 } 438 439 static struct sock *mptcp_nl_find_ssk(struct mptcp_sock *msk, 440 const struct mptcp_addr_info *local, 441 const struct mptcp_addr_info *remote) 442 { 443 struct mptcp_subflow_context *subflow; 444 445 if (local->family != remote->family) 446 return NULL; 447 448 mptcp_for_each_subflow(msk, subflow) { 449 const struct inet_sock *issk; 450 struct sock *ssk; 451 452 ssk = mptcp_subflow_tcp_sock(subflow); 453 454 if (local->family != ssk->sk_family) 455 continue; 456 457 issk = inet_sk(ssk); 458 459 switch (ssk->sk_family) { 460 case AF_INET: 461 if (issk->inet_saddr != local->addr.s_addr || 462 issk->inet_daddr != remote->addr.s_addr) 463 continue; 464 break; 465 #if IS_ENABLED(CONFIG_MPTCP_IPV6) 466 case AF_INET6: { 467 if (!ipv6_addr_equal(&local->addr6, &issk->pinet6->saddr) || 468 !ipv6_addr_equal(&remote->addr6, &ssk->sk_v6_daddr)) 469 continue; 470 break; 471 } 472 #endif 473 default: 474 continue; 475 } 476 477 if (issk->inet_sport == local->port && 478 issk->inet_dport == remote->port) 479 return ssk; 480 } 481 482 return NULL; 483 } 484 485 int mptcp_pm_nl_subflow_destroy_doit(struct sk_buff *skb, struct genl_info *info) 486 { 487 struct mptcp_pm_addr_entry addr_l; 488 struct mptcp_addr_info addr_r; 489 struct nlattr *raddr, *laddr; 490 struct mptcp_sock *msk; 491 struct sock *sk, *ssk; 492 int err = -EINVAL; 493 494 if (GENL_REQ_ATTR_CHECK(info, MPTCP_PM_ATTR_ADDR) || 495 GENL_REQ_ATTR_CHECK(info, MPTCP_PM_ATTR_ADDR_REMOTE)) 496 return err; 497 498 msk = mptcp_userspace_pm_get_sock(info); 499 if (!msk) 500 return err; 501 502 sk = (struct sock *)msk; 503 504 laddr = info->attrs[MPTCP_PM_ATTR_ADDR]; 505 err = mptcp_pm_parse_entry(laddr, info, true, &addr_l); 506 if (err < 0) 507 goto destroy_err; 508 509 raddr = info->attrs[MPTCP_PM_ATTR_ADDR_REMOTE]; 510 err = mptcp_pm_parse_addr(raddr, info, &addr_r); 511 if (err < 0) 512 goto destroy_err; 513 514 #if IS_ENABLED(CONFIG_MPTCP_IPV6) 515 if (addr_l.addr.family == AF_INET && ipv6_addr_v4mapped(&addr_r.addr6)) { 516 ipv6_addr_set_v4mapped(addr_l.addr.addr.s_addr, &addr_l.addr.addr6); 517 addr_l.addr.family = AF_INET6; 518 } 519 if (addr_r.family == AF_INET && ipv6_addr_v4mapped(&addr_l.addr.addr6)) { 520 ipv6_addr_set_v4mapped(addr_r.addr.s_addr, &addr_r.addr6); 521 addr_r.family = AF_INET6; 522 } 523 #endif 524 if (addr_l.addr.family != addr_r.family) { 525 GENL_SET_ERR_MSG(info, "address families do not match"); 526 err = -EINVAL; 527 goto destroy_err; 528 } 529 530 if (!addr_l.addr.port) { 531 NL_SET_ERR_MSG_ATTR(info->extack, laddr, "missing local port"); 532 err = -EINVAL; 533 goto destroy_err; 534 } 535 536 if (!addr_r.port) { 537 NL_SET_ERR_MSG_ATTR(info->extack, raddr, "missing remote port"); 538 err = -EINVAL; 539 goto destroy_err; 540 } 541 542 lock_sock(sk); 543 ssk = mptcp_nl_find_ssk(msk, &addr_l.addr, &addr_r); 544 if (!ssk) { 545 GENL_SET_ERR_MSG(info, "subflow not found"); 546 err = -ESRCH; 547 goto release_sock; 548 } 549 550 spin_lock_bh(&msk->pm.lock); 551 mptcp_userspace_pm_delete_local_addr(msk, &addr_l); 552 spin_unlock_bh(&msk->pm.lock); 553 mptcp_subflow_shutdown(sk, ssk, RCV_SHUTDOWN | SEND_SHUTDOWN); 554 mptcp_close_ssk(sk, ssk, mptcp_subflow_ctx(ssk)); 555 MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_RMSUBFLOW); 556 release_sock: 557 release_sock(sk); 558 559 destroy_err: 560 sock_put(sk); 561 return err; 562 } 563 564 int mptcp_userspace_pm_set_flags(struct mptcp_pm_addr_entry *local, 565 struct genl_info *info) 566 { 567 struct mptcp_addr_info rem = { .family = AF_UNSPEC, }; 568 struct mptcp_pm_addr_entry *entry; 569 struct nlattr *attr, *attr_rem; 570 struct mptcp_sock *msk; 571 int ret = -EINVAL; 572 struct sock *sk; 573 u8 bkup = 0; 574 575 if (GENL_REQ_ATTR_CHECK(info, MPTCP_PM_ATTR_ADDR_REMOTE)) 576 return ret; 577 578 msk = mptcp_userspace_pm_get_sock(info); 579 if (!msk) 580 return ret; 581 582 sk = (struct sock *)msk; 583 584 attr = info->attrs[MPTCP_PM_ATTR_ADDR]; 585 if (local->addr.family == AF_UNSPEC) { 586 NL_SET_ERR_MSG_ATTR(info->extack, attr, 587 "invalid local address family"); 588 ret = -EINVAL; 589 goto set_flags_err; 590 } 591 592 attr_rem = info->attrs[MPTCP_PM_ATTR_ADDR_REMOTE]; 593 ret = mptcp_pm_parse_addr(attr_rem, info, &rem); 594 if (ret < 0) 595 goto set_flags_err; 596 597 if (rem.family == AF_UNSPEC) { 598 NL_SET_ERR_MSG_ATTR(info->extack, attr_rem, 599 "invalid remote address family"); 600 ret = -EINVAL; 601 goto set_flags_err; 602 } 603 604 if (local->flags & MPTCP_PM_ADDR_FLAG_BACKUP) 605 bkup = 1; 606 607 spin_lock_bh(&msk->pm.lock); 608 entry = mptcp_userspace_pm_lookup_addr(msk, &local->addr); 609 if (entry) { 610 if (bkup) 611 entry->flags |= MPTCP_PM_ADDR_FLAG_BACKUP; 612 else 613 entry->flags &= ~MPTCP_PM_ADDR_FLAG_BACKUP; 614 } 615 spin_unlock_bh(&msk->pm.lock); 616 617 lock_sock(sk); 618 ret = mptcp_pm_mp_prio_send_ack(msk, &local->addr, &rem, bkup); 619 release_sock(sk); 620 621 /* mptcp_pm_mp_prio_send_ack() only fails in one case */ 622 if (ret < 0) 623 GENL_SET_ERR_MSG(info, "subflow not found"); 624 625 set_flags_err: 626 sock_put(sk); 627 return ret; 628 } 629 630 int mptcp_userspace_pm_dump_addr(struct sk_buff *msg, 631 struct netlink_callback *cb) 632 { 633 struct id_bitmap { 634 DECLARE_BITMAP(map, MPTCP_PM_MAX_ADDR_ID + 1); 635 } *bitmap; 636 const struct genl_info *info = genl_info_dump(cb); 637 struct mptcp_pm_addr_entry *entry; 638 struct mptcp_sock *msk; 639 int ret = -EINVAL; 640 struct sock *sk; 641 642 BUILD_BUG_ON(sizeof(struct id_bitmap) > sizeof(cb->ctx)); 643 644 bitmap = (struct id_bitmap *)cb->ctx; 645 646 msk = mptcp_userspace_pm_get_sock(info); 647 if (!msk) 648 return ret; 649 650 sk = (struct sock *)msk; 651 652 lock_sock(sk); 653 spin_lock_bh(&msk->pm.lock); 654 mptcp_for_each_userspace_pm_addr(msk, entry) { 655 if (test_bit(entry->addr.id, bitmap->map)) 656 continue; 657 658 if (mptcp_pm_genl_fill_addr(msg, cb, entry) < 0) 659 break; 660 661 __set_bit(entry->addr.id, bitmap->map); 662 } 663 spin_unlock_bh(&msk->pm.lock); 664 release_sock(sk); 665 ret = msg->len; 666 667 sock_put(sk); 668 return ret; 669 } 670 671 int mptcp_userspace_pm_get_addr(u8 id, struct mptcp_pm_addr_entry *addr, 672 struct genl_info *info) 673 { 674 struct mptcp_pm_addr_entry *entry; 675 struct mptcp_sock *msk; 676 int ret = -EINVAL; 677 struct sock *sk; 678 679 msk = mptcp_userspace_pm_get_sock(info); 680 if (!msk) 681 return ret; 682 683 sk = (struct sock *)msk; 684 685 lock_sock(sk); 686 spin_lock_bh(&msk->pm.lock); 687 entry = mptcp_userspace_pm_lookup_addr_by_id(msk, id); 688 if (entry) { 689 *addr = *entry; 690 ret = 0; 691 } 692 spin_unlock_bh(&msk->pm.lock); 693 release_sock(sk); 694 695 sock_put(sk); 696 return ret; 697 } 698 699 static struct mptcp_pm_ops mptcp_pm_userspace = { 700 .name = "userspace", 701 .owner = THIS_MODULE, 702 }; 703 704 void __init mptcp_pm_userspace_register(void) 705 { 706 mptcp_pm_register(&mptcp_pm_userspace); 707 } 708