1 // SPDX-License-Identifier: GPL-2.0 2 /* Multipath TCP 3 * 4 * Copyright (c) 2019, Intel Corporation. 5 */ 6 #define pr_fmt(fmt) "MPTCP: " fmt 7 8 #include <linux/kernel.h> 9 #include <net/mptcp.h> 10 #include "protocol.h" 11 12 #include "mib.h" 13 #include "mptcp_pm_gen.h" 14 15 /* path manager command handlers */ 16 17 int mptcp_pm_announce_addr(struct mptcp_sock *msk, 18 const struct mptcp_addr_info *addr, 19 bool echo) 20 { 21 u8 add_addr = READ_ONCE(msk->pm.addr_signal); 22 23 pr_debug("msk=%p, local_id=%d, echo=%d\n", msk, addr->id, echo); 24 25 lockdep_assert_held(&msk->pm.lock); 26 27 if (add_addr & 28 (echo ? BIT(MPTCP_ADD_ADDR_ECHO) : BIT(MPTCP_ADD_ADDR_SIGNAL))) { 29 MPTCP_INC_STATS(sock_net((struct sock *)msk), 30 echo ? MPTCP_MIB_ECHOADDTXDROP : MPTCP_MIB_ADDADDRTXDROP); 31 return -EINVAL; 32 } 33 34 if (echo) { 35 msk->pm.remote = *addr; 36 add_addr |= BIT(MPTCP_ADD_ADDR_ECHO); 37 } else { 38 msk->pm.local = *addr; 39 add_addr |= BIT(MPTCP_ADD_ADDR_SIGNAL); 40 } 41 WRITE_ONCE(msk->pm.addr_signal, add_addr); 42 return 0; 43 } 44 45 int mptcp_pm_remove_addr(struct mptcp_sock *msk, const struct mptcp_rm_list *rm_list) 46 { 47 u8 rm_addr = READ_ONCE(msk->pm.addr_signal); 48 49 pr_debug("msk=%p, rm_list_nr=%d\n", msk, rm_list->nr); 50 51 if (rm_addr) { 52 MPTCP_ADD_STATS(sock_net((struct sock *)msk), 53 MPTCP_MIB_RMADDRTXDROP, rm_list->nr); 54 return -EINVAL; 55 } 56 57 msk->pm.rm_list_tx = *rm_list; 58 rm_addr |= BIT(MPTCP_RM_ADDR_SIGNAL); 59 WRITE_ONCE(msk->pm.addr_signal, rm_addr); 60 mptcp_pm_nl_addr_send_ack(msk); 61 return 0; 62 } 63 64 /* path manager event handlers */ 65 66 void mptcp_pm_new_connection(struct mptcp_sock *msk, const struct sock *ssk, int server_side) 67 { 68 struct mptcp_pm_data *pm = &msk->pm; 69 70 pr_debug("msk=%p, token=%u side=%d\n", msk, READ_ONCE(msk->token), server_side); 71 72 WRITE_ONCE(pm->server_side, server_side); 73 mptcp_event(MPTCP_EVENT_CREATED, msk, ssk, GFP_ATOMIC); 74 } 75 76 bool mptcp_pm_allow_new_subflow(struct mptcp_sock *msk) 77 { 78 struct mptcp_pm_data *pm = &msk->pm; 79 unsigned int subflows_max; 80 int ret = 0; 81 82 if (mptcp_pm_is_userspace(msk)) { 83 if (mptcp_userspace_pm_active(msk)) { 84 spin_lock_bh(&pm->lock); 85 pm->subflows++; 86 spin_unlock_bh(&pm->lock); 87 return true; 88 } 89 return false; 90 } 91 92 subflows_max = mptcp_pm_get_subflows_max(msk); 93 94 pr_debug("msk=%p subflows=%d max=%d allow=%d\n", msk, pm->subflows, 95 subflows_max, READ_ONCE(pm->accept_subflow)); 96 97 /* try to avoid acquiring the lock below */ 98 if (!READ_ONCE(pm->accept_subflow)) 99 return false; 100 101 spin_lock_bh(&pm->lock); 102 if (READ_ONCE(pm->accept_subflow)) { 103 ret = pm->subflows < subflows_max; 104 if (ret && ++pm->subflows == subflows_max) 105 WRITE_ONCE(pm->accept_subflow, false); 106 } 107 spin_unlock_bh(&pm->lock); 108 109 return ret; 110 } 111 112 /* return true if the new status bit is currently cleared, that is, this event 113 * can be server, eventually by an already scheduled work 114 */ 115 static bool mptcp_pm_schedule_work(struct mptcp_sock *msk, 116 enum mptcp_pm_status new_status) 117 { 118 pr_debug("msk=%p status=%x new=%lx\n", msk, msk->pm.status, 119 BIT(new_status)); 120 if (msk->pm.status & BIT(new_status)) 121 return false; 122 123 msk->pm.status |= BIT(new_status); 124 mptcp_schedule_work((struct sock *)msk); 125 return true; 126 } 127 128 void mptcp_pm_fully_established(struct mptcp_sock *msk, const struct sock *ssk) 129 { 130 struct mptcp_pm_data *pm = &msk->pm; 131 bool announce = false; 132 133 pr_debug("msk=%p\n", msk); 134 135 spin_lock_bh(&pm->lock); 136 137 /* mptcp_pm_fully_established() can be invoked by multiple 138 * racing paths - accept() and check_fully_established() 139 * be sure to serve this event only once. 140 */ 141 if (READ_ONCE(pm->work_pending) && 142 !(msk->pm.status & BIT(MPTCP_PM_ALREADY_ESTABLISHED))) 143 mptcp_pm_schedule_work(msk, MPTCP_PM_ESTABLISHED); 144 145 if ((msk->pm.status & BIT(MPTCP_PM_ALREADY_ESTABLISHED)) == 0) 146 announce = true; 147 148 msk->pm.status |= BIT(MPTCP_PM_ALREADY_ESTABLISHED); 149 spin_unlock_bh(&pm->lock); 150 151 if (announce) 152 mptcp_event(MPTCP_EVENT_ESTABLISHED, msk, ssk, GFP_ATOMIC); 153 } 154 155 void mptcp_pm_connection_closed(struct mptcp_sock *msk) 156 { 157 pr_debug("msk=%p\n", msk); 158 159 if (msk->token) 160 mptcp_event(MPTCP_EVENT_CLOSED, msk, NULL, GFP_KERNEL); 161 } 162 163 void mptcp_pm_subflow_established(struct mptcp_sock *msk) 164 { 165 struct mptcp_pm_data *pm = &msk->pm; 166 167 pr_debug("msk=%p\n", msk); 168 169 if (!READ_ONCE(pm->work_pending)) 170 return; 171 172 spin_lock_bh(&pm->lock); 173 174 if (READ_ONCE(pm->work_pending)) 175 mptcp_pm_schedule_work(msk, MPTCP_PM_SUBFLOW_ESTABLISHED); 176 177 spin_unlock_bh(&pm->lock); 178 } 179 180 void mptcp_pm_subflow_check_next(struct mptcp_sock *msk, 181 const struct mptcp_subflow_context *subflow) 182 { 183 struct mptcp_pm_data *pm = &msk->pm; 184 bool update_subflows; 185 186 update_subflows = subflow->request_join || subflow->mp_join; 187 if (mptcp_pm_is_userspace(msk)) { 188 if (update_subflows) { 189 spin_lock_bh(&pm->lock); 190 pm->subflows--; 191 spin_unlock_bh(&pm->lock); 192 } 193 return; 194 } 195 196 if (!READ_ONCE(pm->work_pending) && !update_subflows) 197 return; 198 199 spin_lock_bh(&pm->lock); 200 if (update_subflows) 201 __mptcp_pm_close_subflow(msk); 202 203 /* Even if this subflow is not really established, tell the PM to try 204 * to pick the next ones, if possible. 205 */ 206 if (mptcp_pm_nl_check_work_pending(msk)) 207 mptcp_pm_schedule_work(msk, MPTCP_PM_SUBFLOW_ESTABLISHED); 208 209 spin_unlock_bh(&pm->lock); 210 } 211 212 void mptcp_pm_add_addr_received(const struct sock *ssk, 213 const struct mptcp_addr_info *addr) 214 { 215 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); 216 struct mptcp_sock *msk = mptcp_sk(subflow->conn); 217 struct mptcp_pm_data *pm = &msk->pm; 218 219 pr_debug("msk=%p remote_id=%d accept=%d\n", msk, addr->id, 220 READ_ONCE(pm->accept_addr)); 221 222 mptcp_event_addr_announced(ssk, addr); 223 224 spin_lock_bh(&pm->lock); 225 226 if (mptcp_pm_is_userspace(msk)) { 227 if (mptcp_userspace_pm_active(msk)) { 228 mptcp_pm_announce_addr(msk, addr, true); 229 mptcp_pm_add_addr_send_ack(msk); 230 } else { 231 __MPTCP_INC_STATS(sock_net((struct sock *)msk), MPTCP_MIB_ADDADDRDROP); 232 } 233 /* id0 should not have a different address */ 234 } else if ((addr->id == 0 && !mptcp_pm_nl_is_init_remote_addr(msk, addr)) || 235 (addr->id > 0 && !READ_ONCE(pm->accept_addr))) { 236 mptcp_pm_announce_addr(msk, addr, true); 237 mptcp_pm_add_addr_send_ack(msk); 238 } else if (mptcp_pm_schedule_work(msk, MPTCP_PM_ADD_ADDR_RECEIVED)) { 239 pm->remote = *addr; 240 } else { 241 __MPTCP_INC_STATS(sock_net((struct sock *)msk), MPTCP_MIB_ADDADDRDROP); 242 } 243 244 spin_unlock_bh(&pm->lock); 245 } 246 247 void mptcp_pm_add_addr_echoed(struct mptcp_sock *msk, 248 const struct mptcp_addr_info *addr) 249 { 250 struct mptcp_pm_data *pm = &msk->pm; 251 252 pr_debug("msk=%p\n", msk); 253 254 spin_lock_bh(&pm->lock); 255 256 if (mptcp_lookup_anno_list_by_saddr(msk, addr) && READ_ONCE(pm->work_pending)) 257 mptcp_pm_schedule_work(msk, MPTCP_PM_SUBFLOW_ESTABLISHED); 258 259 spin_unlock_bh(&pm->lock); 260 } 261 262 void mptcp_pm_add_addr_send_ack(struct mptcp_sock *msk) 263 { 264 if (!mptcp_pm_should_add_signal(msk)) 265 return; 266 267 mptcp_pm_schedule_work(msk, MPTCP_PM_ADD_ADDR_SEND_ACK); 268 } 269 270 void mptcp_pm_rm_addr_received(struct mptcp_sock *msk, 271 const struct mptcp_rm_list *rm_list) 272 { 273 struct mptcp_pm_data *pm = &msk->pm; 274 u8 i; 275 276 pr_debug("msk=%p remote_ids_nr=%d\n", msk, rm_list->nr); 277 278 for (i = 0; i < rm_list->nr; i++) 279 mptcp_event_addr_removed(msk, rm_list->ids[i]); 280 281 spin_lock_bh(&pm->lock); 282 if (mptcp_pm_schedule_work(msk, MPTCP_PM_RM_ADDR_RECEIVED)) 283 pm->rm_list_rx = *rm_list; 284 else 285 __MPTCP_INC_STATS(sock_net((struct sock *)msk), MPTCP_MIB_RMADDRDROP); 286 spin_unlock_bh(&pm->lock); 287 } 288 289 void mptcp_pm_mp_prio_received(struct sock *ssk, u8 bkup) 290 { 291 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); 292 struct sock *sk = subflow->conn; 293 struct mptcp_sock *msk; 294 295 pr_debug("subflow->backup=%d, bkup=%d\n", subflow->backup, bkup); 296 msk = mptcp_sk(sk); 297 if (subflow->backup != bkup) 298 subflow->backup = bkup; 299 300 mptcp_event(MPTCP_EVENT_SUB_PRIORITY, msk, ssk, GFP_ATOMIC); 301 } 302 303 void mptcp_pm_mp_fail_received(struct sock *sk, u64 fail_seq) 304 { 305 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); 306 struct mptcp_sock *msk = mptcp_sk(subflow->conn); 307 308 pr_debug("fail_seq=%llu\n", fail_seq); 309 310 if (!READ_ONCE(msk->allow_infinite_fallback)) 311 return; 312 313 if (!subflow->fail_tout) { 314 pr_debug("send MP_FAIL response and infinite map\n"); 315 316 subflow->send_mp_fail = 1; 317 subflow->send_infinite_map = 1; 318 tcp_send_ack(sk); 319 } else { 320 pr_debug("MP_FAIL response received\n"); 321 WRITE_ONCE(subflow->fail_tout, 0); 322 } 323 } 324 325 /* path manager helpers */ 326 327 bool mptcp_pm_add_addr_signal(struct mptcp_sock *msk, const struct sk_buff *skb, 328 unsigned int opt_size, unsigned int remaining, 329 struct mptcp_addr_info *addr, bool *echo, 330 bool *drop_other_suboptions) 331 { 332 int ret = false; 333 u8 add_addr; 334 u8 family; 335 bool port; 336 337 spin_lock_bh(&msk->pm.lock); 338 339 /* double check after the lock is acquired */ 340 if (!mptcp_pm_should_add_signal(msk)) 341 goto out_unlock; 342 343 /* always drop every other options for pure ack ADD_ADDR; this is a 344 * plain dup-ack from TCP perspective. The other MPTCP-relevant info, 345 * if any, will be carried by the 'original' TCP ack 346 */ 347 if (skb && skb_is_tcp_pure_ack(skb)) { 348 remaining += opt_size; 349 *drop_other_suboptions = true; 350 } 351 352 *echo = mptcp_pm_should_add_signal_echo(msk); 353 port = !!(*echo ? msk->pm.remote.port : msk->pm.local.port); 354 355 family = *echo ? msk->pm.remote.family : msk->pm.local.family; 356 if (remaining < mptcp_add_addr_len(family, *echo, port)) 357 goto out_unlock; 358 359 if (*echo) { 360 *addr = msk->pm.remote; 361 add_addr = msk->pm.addr_signal & ~BIT(MPTCP_ADD_ADDR_ECHO); 362 } else { 363 *addr = msk->pm.local; 364 add_addr = msk->pm.addr_signal & ~BIT(MPTCP_ADD_ADDR_SIGNAL); 365 } 366 WRITE_ONCE(msk->pm.addr_signal, add_addr); 367 ret = true; 368 369 out_unlock: 370 spin_unlock_bh(&msk->pm.lock); 371 return ret; 372 } 373 374 bool mptcp_pm_rm_addr_signal(struct mptcp_sock *msk, unsigned int remaining, 375 struct mptcp_rm_list *rm_list) 376 { 377 int ret = false, len; 378 u8 rm_addr; 379 380 spin_lock_bh(&msk->pm.lock); 381 382 /* double check after the lock is acquired */ 383 if (!mptcp_pm_should_rm_signal(msk)) 384 goto out_unlock; 385 386 rm_addr = msk->pm.addr_signal & ~BIT(MPTCP_RM_ADDR_SIGNAL); 387 len = mptcp_rm_addr_len(&msk->pm.rm_list_tx); 388 if (len < 0) { 389 WRITE_ONCE(msk->pm.addr_signal, rm_addr); 390 goto out_unlock; 391 } 392 if (remaining < len) 393 goto out_unlock; 394 395 *rm_list = msk->pm.rm_list_tx; 396 WRITE_ONCE(msk->pm.addr_signal, rm_addr); 397 ret = true; 398 399 out_unlock: 400 spin_unlock_bh(&msk->pm.lock); 401 return ret; 402 } 403 404 int mptcp_pm_get_local_id(struct mptcp_sock *msk, struct sock_common *skc) 405 { 406 struct mptcp_addr_info skc_local; 407 struct mptcp_addr_info msk_local; 408 409 if (WARN_ON_ONCE(!msk)) 410 return -1; 411 412 /* The 0 ID mapping is defined by the first subflow, copied into the msk 413 * addr 414 */ 415 mptcp_local_address((struct sock_common *)msk, &msk_local); 416 mptcp_local_address((struct sock_common *)skc, &skc_local); 417 if (mptcp_addresses_equal(&msk_local, &skc_local, false)) 418 return 0; 419 420 if (mptcp_pm_is_userspace(msk)) 421 return mptcp_userspace_pm_get_local_id(msk, &skc_local); 422 return mptcp_pm_nl_get_local_id(msk, &skc_local); 423 } 424 425 bool mptcp_pm_is_backup(struct mptcp_sock *msk, struct sock_common *skc) 426 { 427 struct mptcp_addr_info skc_local; 428 429 mptcp_local_address((struct sock_common *)skc, &skc_local); 430 431 if (mptcp_pm_is_userspace(msk)) 432 return mptcp_userspace_pm_is_backup(msk, &skc_local); 433 434 return mptcp_pm_nl_is_backup(msk, &skc_local); 435 } 436 437 static int mptcp_pm_get_addr(u8 id, struct mptcp_pm_addr_entry *addr, 438 struct genl_info *info) 439 { 440 if (info->attrs[MPTCP_PM_ATTR_TOKEN]) 441 return mptcp_userspace_pm_get_addr(id, addr, info); 442 return mptcp_pm_nl_get_addr(id, addr, info); 443 } 444 445 int mptcp_pm_nl_get_addr_doit(struct sk_buff *skb, struct genl_info *info) 446 { 447 struct mptcp_pm_addr_entry addr; 448 struct nlattr *attr; 449 struct sk_buff *msg; 450 void *reply; 451 int ret; 452 453 if (GENL_REQ_ATTR_CHECK(info, MPTCP_PM_ENDPOINT_ADDR)) 454 return -EINVAL; 455 456 attr = info->attrs[MPTCP_PM_ENDPOINT_ADDR]; 457 ret = mptcp_pm_parse_entry(attr, info, false, &addr); 458 if (ret < 0) 459 return ret; 460 461 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 462 if (!msg) 463 return -ENOMEM; 464 465 reply = genlmsg_put_reply(msg, info, &mptcp_genl_family, 0, 466 info->genlhdr->cmd); 467 if (!reply) { 468 GENL_SET_ERR_MSG(info, "not enough space in Netlink message"); 469 ret = -EMSGSIZE; 470 goto fail; 471 } 472 473 ret = mptcp_pm_get_addr(addr.addr.id, &addr, info); 474 if (ret) { 475 NL_SET_ERR_MSG_ATTR(info->extack, attr, "address not found"); 476 goto fail; 477 } 478 479 ret = mptcp_nl_fill_addr(msg, &addr); 480 if (ret) 481 goto fail; 482 483 genlmsg_end(msg, reply); 484 ret = genlmsg_reply(msg, info); 485 return ret; 486 487 fail: 488 nlmsg_free(msg); 489 return ret; 490 } 491 492 int mptcp_pm_genl_fill_addr(struct sk_buff *msg, 493 struct netlink_callback *cb, 494 struct mptcp_pm_addr_entry *entry) 495 { 496 void *hdr; 497 498 hdr = genlmsg_put(msg, NETLINK_CB(cb->skb).portid, 499 cb->nlh->nlmsg_seq, &mptcp_genl_family, 500 NLM_F_MULTI, MPTCP_PM_CMD_GET_ADDR); 501 if (!hdr) 502 return -EINVAL; 503 504 if (mptcp_nl_fill_addr(msg, entry) < 0) { 505 genlmsg_cancel(msg, hdr); 506 return -EINVAL; 507 } 508 509 genlmsg_end(msg, hdr); 510 return 0; 511 } 512 513 static int mptcp_pm_dump_addr(struct sk_buff *msg, struct netlink_callback *cb) 514 { 515 const struct genl_info *info = genl_info_dump(cb); 516 517 if (info->attrs[MPTCP_PM_ATTR_TOKEN]) 518 return mptcp_userspace_pm_dump_addr(msg, cb); 519 return mptcp_pm_nl_dump_addr(msg, cb); 520 } 521 522 int mptcp_pm_nl_get_addr_dumpit(struct sk_buff *msg, 523 struct netlink_callback *cb) 524 { 525 return mptcp_pm_dump_addr(msg, cb); 526 } 527 528 static int mptcp_pm_set_flags(struct genl_info *info) 529 { 530 struct mptcp_pm_addr_entry loc = { .addr = { .family = AF_UNSPEC }, }; 531 struct nlattr *attr_loc; 532 int ret = -EINVAL; 533 534 if (GENL_REQ_ATTR_CHECK(info, MPTCP_PM_ATTR_ADDR)) 535 return ret; 536 537 attr_loc = info->attrs[MPTCP_PM_ATTR_ADDR]; 538 ret = mptcp_pm_parse_entry(attr_loc, info, false, &loc); 539 if (ret < 0) 540 return ret; 541 542 if (info->attrs[MPTCP_PM_ATTR_TOKEN]) 543 return mptcp_userspace_pm_set_flags(&loc, info); 544 return mptcp_pm_nl_set_flags(&loc, info); 545 } 546 547 int mptcp_pm_nl_set_flags_doit(struct sk_buff *skb, struct genl_info *info) 548 { 549 return mptcp_pm_set_flags(info); 550 } 551 552 void mptcp_pm_subflow_chk_stale(const struct mptcp_sock *msk, struct sock *ssk) 553 { 554 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); 555 u32 rcv_tstamp = READ_ONCE(tcp_sk(ssk)->rcv_tstamp); 556 557 /* keep track of rtx periods with no progress */ 558 if (!subflow->stale_count) { 559 subflow->stale_rcv_tstamp = rcv_tstamp; 560 subflow->stale_count++; 561 } else if (subflow->stale_rcv_tstamp == rcv_tstamp) { 562 if (subflow->stale_count < U8_MAX) 563 subflow->stale_count++; 564 mptcp_pm_nl_subflow_chk_stale(msk, ssk); 565 } else { 566 subflow->stale_count = 0; 567 mptcp_subflow_set_active(subflow); 568 } 569 } 570 571 /* if sk is ipv4 or ipv6_only allows only same-family local and remote addresses, 572 * otherwise allow any matching local/remote pair 573 */ 574 bool mptcp_pm_addr_families_match(const struct sock *sk, 575 const struct mptcp_addr_info *loc, 576 const struct mptcp_addr_info *rem) 577 { 578 bool mptcp_is_v4 = sk->sk_family == AF_INET; 579 580 #if IS_ENABLED(CONFIG_MPTCP_IPV6) 581 bool loc_is_v4 = loc->family == AF_INET || ipv6_addr_v4mapped(&loc->addr6); 582 bool rem_is_v4 = rem->family == AF_INET || ipv6_addr_v4mapped(&rem->addr6); 583 584 if (mptcp_is_v4) 585 return loc_is_v4 && rem_is_v4; 586 587 if (ipv6_only_sock(sk)) 588 return !loc_is_v4 && !rem_is_v4; 589 590 return loc_is_v4 == rem_is_v4; 591 #else 592 return mptcp_is_v4 && loc->family == AF_INET && rem->family == AF_INET; 593 #endif 594 } 595 596 void mptcp_pm_data_reset(struct mptcp_sock *msk) 597 { 598 u8 pm_type = mptcp_get_pm_type(sock_net((struct sock *)msk)); 599 struct mptcp_pm_data *pm = &msk->pm; 600 601 pm->add_addr_signaled = 0; 602 pm->add_addr_accepted = 0; 603 pm->local_addr_used = 0; 604 pm->subflows = 0; 605 pm->rm_list_tx.nr = 0; 606 pm->rm_list_rx.nr = 0; 607 WRITE_ONCE(pm->pm_type, pm_type); 608 609 if (pm_type == MPTCP_PM_TYPE_KERNEL) { 610 bool subflows_allowed = !!mptcp_pm_get_subflows_max(msk); 611 612 /* pm->work_pending must be only be set to 'true' when 613 * pm->pm_type is set to MPTCP_PM_TYPE_KERNEL 614 */ 615 WRITE_ONCE(pm->work_pending, 616 (!!mptcp_pm_get_local_addr_max(msk) && 617 subflows_allowed) || 618 !!mptcp_pm_get_add_addr_signal_max(msk)); 619 WRITE_ONCE(pm->accept_addr, 620 !!mptcp_pm_get_add_addr_accept_max(msk) && 621 subflows_allowed); 622 WRITE_ONCE(pm->accept_subflow, subflows_allowed); 623 } else { 624 WRITE_ONCE(pm->work_pending, 0); 625 WRITE_ONCE(pm->accept_addr, 0); 626 WRITE_ONCE(pm->accept_subflow, 0); 627 } 628 629 WRITE_ONCE(pm->addr_signal, 0); 630 WRITE_ONCE(pm->remote_deny_join_id0, false); 631 pm->status = 0; 632 bitmap_fill(msk->pm.id_avail_bitmap, MPTCP_PM_MAX_ADDR_ID + 1); 633 } 634 635 void mptcp_pm_data_init(struct mptcp_sock *msk) 636 { 637 spin_lock_init(&msk->pm.lock); 638 INIT_LIST_HEAD(&msk->pm.anno_list); 639 INIT_LIST_HEAD(&msk->pm.userspace_pm_local_addr_list); 640 mptcp_pm_data_reset(msk); 641 } 642 643 void __init mptcp_pm_init(void) 644 { 645 mptcp_pm_nl_init(); 646 } 647