1 // SPDX-License-Identifier: GPL-2.0 2 /* Multipath TCP 3 * 4 * Copyright (c) 2020, Red Hat, Inc. 5 */ 6 7 #define pr_fmt(fmt) "MPTCP: " fmt 8 9 #include <linux/inet.h> 10 #include <linux/kernel.h> 11 #include <net/tcp.h> 12 #include <net/netns/generic.h> 13 #include <net/mptcp.h> 14 #include <net/genetlink.h> 15 #include <uapi/linux/mptcp.h> 16 17 #include "protocol.h" 18 #include "mib.h" 19 20 /* forward declaration */ 21 static struct genl_family mptcp_genl_family; 22 23 static int pm_nl_pernet_id; 24 25 struct mptcp_pm_addr_entry { 26 struct list_head list; 27 struct mptcp_addr_info addr; 28 u8 flags; 29 int ifindex; 30 struct rcu_head rcu; 31 struct socket *lsk; 32 }; 33 34 struct mptcp_pm_add_entry { 35 struct list_head list; 36 struct mptcp_addr_info addr; 37 struct timer_list add_timer; 38 struct mptcp_sock *sock; 39 u8 retrans_times; 40 }; 41 42 #define MAX_ADDR_ID 255 43 #define BITMAP_SZ DIV_ROUND_UP(MAX_ADDR_ID + 1, BITS_PER_LONG) 44 45 struct pm_nl_pernet { 46 /* protects pernet updates */ 47 spinlock_t lock; 48 struct list_head local_addr_list; 49 unsigned int addrs; 50 unsigned int add_addr_signal_max; 51 unsigned int add_addr_accept_max; 52 unsigned int local_addr_max; 53 unsigned int subflows_max; 54 unsigned int next_id; 55 unsigned long id_bitmap[BITMAP_SZ]; 56 }; 57 58 #define MPTCP_PM_ADDR_MAX 8 59 #define ADD_ADDR_RETRANS_MAX 3 60 61 static bool addresses_equal(const struct mptcp_addr_info *a, 62 struct mptcp_addr_info *b, bool use_port) 63 { 64 bool addr_equals = false; 65 66 if (a->family == b->family) { 67 if (a->family == AF_INET) 68 addr_equals = a->addr.s_addr == b->addr.s_addr; 69 #if IS_ENABLED(CONFIG_MPTCP_IPV6) 70 else 71 addr_equals = !ipv6_addr_cmp(&a->addr6, &b->addr6); 72 } else if (a->family == AF_INET) { 73 if (ipv6_addr_v4mapped(&b->addr6)) 74 addr_equals = a->addr.s_addr == b->addr6.s6_addr32[3]; 75 } else if (b->family == AF_INET) { 76 if (ipv6_addr_v4mapped(&a->addr6)) 77 addr_equals = a->addr6.s6_addr32[3] == b->addr.s_addr; 78 #endif 79 } 80 81 if (!addr_equals) 82 return false; 83 if (!use_port) 84 return true; 85 86 return a->port == b->port; 87 } 88 89 static bool address_zero(const struct mptcp_addr_info *addr) 90 { 91 struct mptcp_addr_info zero; 92 93 memset(&zero, 0, sizeof(zero)); 94 zero.family = addr->family; 95 96 return addresses_equal(addr, &zero, true); 97 } 98 99 static void local_address(const struct sock_common *skc, 100 struct mptcp_addr_info *addr) 101 { 102 addr->family = skc->skc_family; 103 addr->port = htons(skc->skc_num); 104 if (addr->family == AF_INET) 105 addr->addr.s_addr = skc->skc_rcv_saddr; 106 #if IS_ENABLED(CONFIG_MPTCP_IPV6) 107 else if (addr->family == AF_INET6) 108 addr->addr6 = skc->skc_v6_rcv_saddr; 109 #endif 110 } 111 112 static void remote_address(const struct sock_common *skc, 113 struct mptcp_addr_info *addr) 114 { 115 addr->family = skc->skc_family; 116 addr->port = skc->skc_dport; 117 if (addr->family == AF_INET) 118 addr->addr.s_addr = skc->skc_daddr; 119 #if IS_ENABLED(CONFIG_MPTCP_IPV6) 120 else if (addr->family == AF_INET6) 121 addr->addr6 = skc->skc_v6_daddr; 122 #endif 123 } 124 125 static bool lookup_subflow_by_saddr(const struct list_head *list, 126 struct mptcp_addr_info *saddr) 127 { 128 struct mptcp_subflow_context *subflow; 129 struct mptcp_addr_info cur; 130 struct sock_common *skc; 131 132 list_for_each_entry(subflow, list, node) { 133 skc = (struct sock_common *)mptcp_subflow_tcp_sock(subflow); 134 135 local_address(skc, &cur); 136 if (addresses_equal(&cur, saddr, saddr->port)) 137 return true; 138 } 139 140 return false; 141 } 142 143 static bool lookup_subflow_by_daddr(const struct list_head *list, 144 struct mptcp_addr_info *daddr) 145 { 146 struct mptcp_subflow_context *subflow; 147 struct mptcp_addr_info cur; 148 struct sock_common *skc; 149 150 list_for_each_entry(subflow, list, node) { 151 skc = (struct sock_common *)mptcp_subflow_tcp_sock(subflow); 152 153 remote_address(skc, &cur); 154 if (addresses_equal(&cur, daddr, daddr->port)) 155 return true; 156 } 157 158 return false; 159 } 160 161 static struct mptcp_pm_addr_entry * 162 select_local_address(const struct pm_nl_pernet *pernet, 163 struct mptcp_sock *msk) 164 { 165 struct mptcp_pm_addr_entry *entry, *ret = NULL; 166 struct sock *sk = (struct sock *)msk; 167 168 msk_owned_by_me(msk); 169 170 rcu_read_lock(); 171 __mptcp_flush_join_list(msk); 172 list_for_each_entry_rcu(entry, &pernet->local_addr_list, list) { 173 if (!(entry->flags & MPTCP_PM_ADDR_FLAG_SUBFLOW)) 174 continue; 175 176 if (entry->addr.family != sk->sk_family) { 177 #if IS_ENABLED(CONFIG_MPTCP_IPV6) 178 if ((entry->addr.family == AF_INET && 179 !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) || 180 (sk->sk_family == AF_INET && 181 !ipv6_addr_v4mapped(&entry->addr.addr6))) 182 #endif 183 continue; 184 } 185 186 /* avoid any address already in use by subflows and 187 * pending join 188 */ 189 if (!lookup_subflow_by_saddr(&msk->conn_list, &entry->addr)) { 190 ret = entry; 191 break; 192 } 193 } 194 rcu_read_unlock(); 195 return ret; 196 } 197 198 static struct mptcp_pm_addr_entry * 199 select_signal_address(struct pm_nl_pernet *pernet, unsigned int pos) 200 { 201 struct mptcp_pm_addr_entry *entry, *ret = NULL; 202 int i = 0; 203 204 rcu_read_lock(); 205 /* do not keep any additional per socket state, just signal 206 * the address list in order. 207 * Note: removal from the local address list during the msk life-cycle 208 * can lead to additional addresses not being announced. 209 */ 210 list_for_each_entry_rcu(entry, &pernet->local_addr_list, list) { 211 if (!(entry->flags & MPTCP_PM_ADDR_FLAG_SIGNAL)) 212 continue; 213 if (i++ == pos) { 214 ret = entry; 215 break; 216 } 217 } 218 rcu_read_unlock(); 219 return ret; 220 } 221 222 unsigned int mptcp_pm_get_add_addr_signal_max(struct mptcp_sock *msk) 223 { 224 struct pm_nl_pernet *pernet; 225 226 pernet = net_generic(sock_net((struct sock *)msk), pm_nl_pernet_id); 227 return READ_ONCE(pernet->add_addr_signal_max); 228 } 229 EXPORT_SYMBOL_GPL(mptcp_pm_get_add_addr_signal_max); 230 231 unsigned int mptcp_pm_get_add_addr_accept_max(struct mptcp_sock *msk) 232 { 233 struct pm_nl_pernet *pernet; 234 235 pernet = net_generic(sock_net((struct sock *)msk), pm_nl_pernet_id); 236 return READ_ONCE(pernet->add_addr_accept_max); 237 } 238 EXPORT_SYMBOL_GPL(mptcp_pm_get_add_addr_accept_max); 239 240 unsigned int mptcp_pm_get_subflows_max(struct mptcp_sock *msk) 241 { 242 struct pm_nl_pernet *pernet; 243 244 pernet = net_generic(sock_net((struct sock *)msk), pm_nl_pernet_id); 245 return READ_ONCE(pernet->subflows_max); 246 } 247 EXPORT_SYMBOL_GPL(mptcp_pm_get_subflows_max); 248 249 unsigned int mptcp_pm_get_local_addr_max(struct mptcp_sock *msk) 250 { 251 struct pm_nl_pernet *pernet; 252 253 pernet = net_generic(sock_net((struct sock *)msk), pm_nl_pernet_id); 254 return READ_ONCE(pernet->local_addr_max); 255 } 256 EXPORT_SYMBOL_GPL(mptcp_pm_get_local_addr_max); 257 258 static void check_work_pending(struct mptcp_sock *msk) 259 { 260 if (msk->pm.add_addr_signaled == mptcp_pm_get_add_addr_signal_max(msk) && 261 (msk->pm.local_addr_used == mptcp_pm_get_local_addr_max(msk) || 262 msk->pm.subflows == mptcp_pm_get_subflows_max(msk))) 263 WRITE_ONCE(msk->pm.work_pending, false); 264 } 265 266 struct mptcp_pm_add_entry * 267 mptcp_lookup_anno_list_by_saddr(struct mptcp_sock *msk, 268 struct mptcp_addr_info *addr) 269 { 270 struct mptcp_pm_add_entry *entry; 271 272 lockdep_assert_held(&msk->pm.lock); 273 274 list_for_each_entry(entry, &msk->pm.anno_list, list) { 275 if (addresses_equal(&entry->addr, addr, true)) 276 return entry; 277 } 278 279 return NULL; 280 } 281 282 bool mptcp_pm_sport_in_anno_list(struct mptcp_sock *msk, const struct sock *sk) 283 { 284 struct mptcp_pm_add_entry *entry; 285 struct mptcp_addr_info saddr; 286 bool ret = false; 287 288 local_address((struct sock_common *)sk, &saddr); 289 290 spin_lock_bh(&msk->pm.lock); 291 list_for_each_entry(entry, &msk->pm.anno_list, list) { 292 if (addresses_equal(&entry->addr, &saddr, true)) { 293 ret = true; 294 goto out; 295 } 296 } 297 298 out: 299 spin_unlock_bh(&msk->pm.lock); 300 return ret; 301 } 302 303 static void mptcp_pm_add_timer(struct timer_list *timer) 304 { 305 struct mptcp_pm_add_entry *entry = from_timer(entry, timer, add_timer); 306 struct mptcp_sock *msk = entry->sock; 307 struct sock *sk = (struct sock *)msk; 308 309 pr_debug("msk=%p", msk); 310 311 if (!msk) 312 return; 313 314 if (inet_sk_state_load(sk) == TCP_CLOSE) 315 return; 316 317 if (!entry->addr.id) 318 return; 319 320 if (mptcp_pm_should_add_signal(msk)) { 321 sk_reset_timer(sk, timer, jiffies + TCP_RTO_MAX / 8); 322 goto out; 323 } 324 325 spin_lock_bh(&msk->pm.lock); 326 327 if (!mptcp_pm_should_add_signal(msk)) { 328 pr_debug("retransmit ADD_ADDR id=%d", entry->addr.id); 329 mptcp_pm_announce_addr(msk, &entry->addr, false); 330 mptcp_pm_add_addr_send_ack(msk); 331 entry->retrans_times++; 332 } 333 334 if (entry->retrans_times < ADD_ADDR_RETRANS_MAX) 335 sk_reset_timer(sk, timer, 336 jiffies + mptcp_get_add_addr_timeout(sock_net(sk))); 337 338 spin_unlock_bh(&msk->pm.lock); 339 340 if (entry->retrans_times == ADD_ADDR_RETRANS_MAX) 341 mptcp_pm_subflow_established(msk); 342 343 out: 344 __sock_put(sk); 345 } 346 347 struct mptcp_pm_add_entry * 348 mptcp_pm_del_add_timer(struct mptcp_sock *msk, 349 struct mptcp_addr_info *addr) 350 { 351 struct mptcp_pm_add_entry *entry; 352 struct sock *sk = (struct sock *)msk; 353 354 spin_lock_bh(&msk->pm.lock); 355 entry = mptcp_lookup_anno_list_by_saddr(msk, addr); 356 if (entry) 357 entry->retrans_times = ADD_ADDR_RETRANS_MAX; 358 spin_unlock_bh(&msk->pm.lock); 359 360 if (entry) 361 sk_stop_timer_sync(sk, &entry->add_timer); 362 363 return entry; 364 } 365 366 static bool mptcp_pm_alloc_anno_list(struct mptcp_sock *msk, 367 struct mptcp_pm_addr_entry *entry) 368 { 369 struct mptcp_pm_add_entry *add_entry = NULL; 370 struct sock *sk = (struct sock *)msk; 371 struct net *net = sock_net(sk); 372 373 lockdep_assert_held(&msk->pm.lock); 374 375 if (mptcp_lookup_anno_list_by_saddr(msk, &entry->addr)) 376 return false; 377 378 add_entry = kmalloc(sizeof(*add_entry), GFP_ATOMIC); 379 if (!add_entry) 380 return false; 381 382 list_add(&add_entry->list, &msk->pm.anno_list); 383 384 add_entry->addr = entry->addr; 385 add_entry->sock = msk; 386 add_entry->retrans_times = 0; 387 388 timer_setup(&add_entry->add_timer, mptcp_pm_add_timer, 0); 389 sk_reset_timer(sk, &add_entry->add_timer, 390 jiffies + mptcp_get_add_addr_timeout(net)); 391 392 return true; 393 } 394 395 void mptcp_pm_free_anno_list(struct mptcp_sock *msk) 396 { 397 struct mptcp_pm_add_entry *entry, *tmp; 398 struct sock *sk = (struct sock *)msk; 399 LIST_HEAD(free_list); 400 401 pr_debug("msk=%p", msk); 402 403 spin_lock_bh(&msk->pm.lock); 404 list_splice_init(&msk->pm.anno_list, &free_list); 405 spin_unlock_bh(&msk->pm.lock); 406 407 list_for_each_entry_safe(entry, tmp, &free_list, list) { 408 sk_stop_timer_sync(sk, &entry->add_timer); 409 kfree(entry); 410 } 411 } 412 413 static void mptcp_pm_create_subflow_or_signal_addr(struct mptcp_sock *msk) 414 { 415 struct sock *sk = (struct sock *)msk; 416 struct mptcp_pm_addr_entry *local; 417 unsigned int add_addr_signal_max; 418 unsigned int local_addr_max; 419 struct pm_nl_pernet *pernet; 420 unsigned int subflows_max; 421 422 pernet = net_generic(sock_net(sk), pm_nl_pernet_id); 423 424 add_addr_signal_max = mptcp_pm_get_add_addr_signal_max(msk); 425 local_addr_max = mptcp_pm_get_local_addr_max(msk); 426 subflows_max = mptcp_pm_get_subflows_max(msk); 427 428 pr_debug("local %d:%d signal %d:%d subflows %d:%d\n", 429 msk->pm.local_addr_used, local_addr_max, 430 msk->pm.add_addr_signaled, add_addr_signal_max, 431 msk->pm.subflows, subflows_max); 432 433 /* check first for announce */ 434 if (msk->pm.add_addr_signaled < add_addr_signal_max) { 435 local = select_signal_address(pernet, 436 msk->pm.add_addr_signaled); 437 438 if (local) { 439 if (mptcp_pm_alloc_anno_list(msk, local)) { 440 msk->pm.add_addr_signaled++; 441 mptcp_pm_announce_addr(msk, &local->addr, false); 442 mptcp_pm_nl_addr_send_ack(msk); 443 } 444 } else { 445 /* pick failed, avoid fourther attempts later */ 446 msk->pm.local_addr_used = add_addr_signal_max; 447 } 448 449 check_work_pending(msk); 450 } 451 452 /* check if should create a new subflow */ 453 if (msk->pm.local_addr_used < local_addr_max && 454 msk->pm.subflows < subflows_max) { 455 local = select_local_address(pernet, msk); 456 if (local) { 457 struct mptcp_addr_info remote = { 0 }; 458 459 msk->pm.local_addr_used++; 460 msk->pm.subflows++; 461 check_work_pending(msk); 462 remote_address((struct sock_common *)sk, &remote); 463 spin_unlock_bh(&msk->pm.lock); 464 __mptcp_subflow_connect(sk, &local->addr, &remote, 465 local->flags, local->ifindex); 466 spin_lock_bh(&msk->pm.lock); 467 return; 468 } 469 470 /* lookup failed, avoid fourther attempts later */ 471 msk->pm.local_addr_used = local_addr_max; 472 check_work_pending(msk); 473 } 474 } 475 476 static void mptcp_pm_nl_fully_established(struct mptcp_sock *msk) 477 { 478 mptcp_pm_create_subflow_or_signal_addr(msk); 479 } 480 481 static void mptcp_pm_nl_subflow_established(struct mptcp_sock *msk) 482 { 483 mptcp_pm_create_subflow_or_signal_addr(msk); 484 } 485 486 static void mptcp_pm_nl_add_addr_received(struct mptcp_sock *msk) 487 { 488 struct sock *sk = (struct sock *)msk; 489 unsigned int add_addr_accept_max; 490 struct mptcp_addr_info remote; 491 struct mptcp_addr_info local; 492 unsigned int subflows_max; 493 494 add_addr_accept_max = mptcp_pm_get_add_addr_accept_max(msk); 495 subflows_max = mptcp_pm_get_subflows_max(msk); 496 497 pr_debug("accepted %d:%d remote family %d", 498 msk->pm.add_addr_accepted, add_addr_accept_max, 499 msk->pm.remote.family); 500 501 if (lookup_subflow_by_daddr(&msk->conn_list, &msk->pm.remote)) 502 goto add_addr_echo; 503 504 msk->pm.add_addr_accepted++; 505 msk->pm.subflows++; 506 if (msk->pm.add_addr_accepted >= add_addr_accept_max || 507 msk->pm.subflows >= subflows_max) 508 WRITE_ONCE(msk->pm.accept_addr, false); 509 510 /* connect to the specified remote address, using whatever 511 * local address the routing configuration will pick. 512 */ 513 remote = msk->pm.remote; 514 if (!remote.port) 515 remote.port = sk->sk_dport; 516 memset(&local, 0, sizeof(local)); 517 local.family = remote.family; 518 519 spin_unlock_bh(&msk->pm.lock); 520 __mptcp_subflow_connect(sk, &local, &remote, 0, 0); 521 spin_lock_bh(&msk->pm.lock); 522 523 add_addr_echo: 524 mptcp_pm_announce_addr(msk, &msk->pm.remote, true); 525 mptcp_pm_nl_addr_send_ack(msk); 526 } 527 528 void mptcp_pm_nl_addr_send_ack(struct mptcp_sock *msk) 529 { 530 struct mptcp_subflow_context *subflow; 531 532 msk_owned_by_me(msk); 533 lockdep_assert_held(&msk->pm.lock); 534 535 if (!mptcp_pm_should_add_signal(msk) && 536 !mptcp_pm_should_rm_signal(msk)) 537 return; 538 539 __mptcp_flush_join_list(msk); 540 subflow = list_first_entry_or_null(&msk->conn_list, typeof(*subflow), node); 541 if (subflow) { 542 struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 543 544 spin_unlock_bh(&msk->pm.lock); 545 pr_debug("send ack for %s%s%s", 546 mptcp_pm_should_add_signal(msk) ? "add_addr" : "rm_addr", 547 mptcp_pm_should_add_signal_ipv6(msk) ? " [ipv6]" : "", 548 mptcp_pm_should_add_signal_port(msk) ? " [port]" : ""); 549 550 lock_sock(ssk); 551 tcp_send_ack(ssk); 552 release_sock(ssk); 553 spin_lock_bh(&msk->pm.lock); 554 } 555 } 556 557 int mptcp_pm_nl_mp_prio_send_ack(struct mptcp_sock *msk, 558 struct mptcp_addr_info *addr, 559 u8 bkup) 560 { 561 struct mptcp_subflow_context *subflow; 562 563 pr_debug("bkup=%d", bkup); 564 565 mptcp_for_each_subflow(msk, subflow) { 566 struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 567 struct sock *sk = (struct sock *)msk; 568 struct mptcp_addr_info local; 569 570 local_address((struct sock_common *)ssk, &local); 571 if (!addresses_equal(&local, addr, addr->port)) 572 continue; 573 574 subflow->backup = bkup; 575 subflow->send_mp_prio = 1; 576 subflow->request_bkup = bkup; 577 __MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_MPPRIOTX); 578 579 spin_unlock_bh(&msk->pm.lock); 580 pr_debug("send ack for mp_prio"); 581 lock_sock(ssk); 582 tcp_send_ack(ssk); 583 release_sock(ssk); 584 spin_lock_bh(&msk->pm.lock); 585 586 return 0; 587 } 588 589 return -EINVAL; 590 } 591 592 static void mptcp_pm_nl_rm_addr_or_subflow(struct mptcp_sock *msk, 593 const struct mptcp_rm_list *rm_list, 594 enum linux_mptcp_mib_field rm_type) 595 { 596 struct mptcp_subflow_context *subflow, *tmp; 597 struct sock *sk = (struct sock *)msk; 598 u8 i; 599 600 pr_debug("%s rm_list_nr %d", 601 rm_type == MPTCP_MIB_RMADDR ? "address" : "subflow", rm_list->nr); 602 603 msk_owned_by_me(msk); 604 605 if (!rm_list->nr) 606 return; 607 608 if (list_empty(&msk->conn_list)) 609 return; 610 611 for (i = 0; i < rm_list->nr; i++) { 612 list_for_each_entry_safe(subflow, tmp, &msk->conn_list, node) { 613 struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 614 int how = RCV_SHUTDOWN | SEND_SHUTDOWN; 615 u8 id = subflow->local_id; 616 617 if (rm_type == MPTCP_MIB_RMADDR) 618 id = subflow->remote_id; 619 620 if (rm_list->ids[i] != id) 621 continue; 622 623 pr_debug(" -> %s rm_list_ids[%d]=%u local_id=%u remote_id=%u", 624 rm_type == MPTCP_MIB_RMADDR ? "address" : "subflow", 625 i, rm_list->ids[i], subflow->local_id, subflow->remote_id); 626 spin_unlock_bh(&msk->pm.lock); 627 mptcp_subflow_shutdown(sk, ssk, how); 628 mptcp_close_ssk(sk, ssk, subflow); 629 spin_lock_bh(&msk->pm.lock); 630 631 if (rm_type == MPTCP_MIB_RMADDR) { 632 msk->pm.add_addr_accepted--; 633 WRITE_ONCE(msk->pm.accept_addr, true); 634 } else if (rm_type == MPTCP_MIB_RMSUBFLOW) { 635 msk->pm.local_addr_used--; 636 } 637 msk->pm.subflows--; 638 __MPTCP_INC_STATS(sock_net(sk), rm_type); 639 } 640 } 641 } 642 643 static void mptcp_pm_nl_rm_addr_received(struct mptcp_sock *msk) 644 { 645 mptcp_pm_nl_rm_addr_or_subflow(msk, &msk->pm.rm_list_rx, MPTCP_MIB_RMADDR); 646 } 647 648 void mptcp_pm_nl_rm_subflow_received(struct mptcp_sock *msk, 649 const struct mptcp_rm_list *rm_list) 650 { 651 mptcp_pm_nl_rm_addr_or_subflow(msk, rm_list, MPTCP_MIB_RMSUBFLOW); 652 } 653 654 void mptcp_pm_nl_work(struct mptcp_sock *msk) 655 { 656 struct mptcp_pm_data *pm = &msk->pm; 657 658 msk_owned_by_me(msk); 659 660 spin_lock_bh(&msk->pm.lock); 661 662 pr_debug("msk=%p status=%x", msk, pm->status); 663 if (pm->status & BIT(MPTCP_PM_ADD_ADDR_RECEIVED)) { 664 pm->status &= ~BIT(MPTCP_PM_ADD_ADDR_RECEIVED); 665 mptcp_pm_nl_add_addr_received(msk); 666 } 667 if (pm->status & BIT(MPTCP_PM_ADD_ADDR_SEND_ACK)) { 668 pm->status &= ~BIT(MPTCP_PM_ADD_ADDR_SEND_ACK); 669 mptcp_pm_nl_addr_send_ack(msk); 670 } 671 if (pm->status & BIT(MPTCP_PM_RM_ADDR_RECEIVED)) { 672 pm->status &= ~BIT(MPTCP_PM_RM_ADDR_RECEIVED); 673 mptcp_pm_nl_rm_addr_received(msk); 674 } 675 if (pm->status & BIT(MPTCP_PM_ESTABLISHED)) { 676 pm->status &= ~BIT(MPTCP_PM_ESTABLISHED); 677 mptcp_pm_nl_fully_established(msk); 678 } 679 if (pm->status & BIT(MPTCP_PM_SUBFLOW_ESTABLISHED)) { 680 pm->status &= ~BIT(MPTCP_PM_SUBFLOW_ESTABLISHED); 681 mptcp_pm_nl_subflow_established(msk); 682 } 683 684 spin_unlock_bh(&msk->pm.lock); 685 } 686 687 static bool address_use_port(struct mptcp_pm_addr_entry *entry) 688 { 689 return (entry->flags & 690 (MPTCP_PM_ADDR_FLAG_SIGNAL | MPTCP_PM_ADDR_FLAG_SUBFLOW)) == 691 MPTCP_PM_ADDR_FLAG_SIGNAL; 692 } 693 694 static int mptcp_pm_nl_append_new_local_addr(struct pm_nl_pernet *pernet, 695 struct mptcp_pm_addr_entry *entry) 696 { 697 struct mptcp_pm_addr_entry *cur; 698 unsigned int addr_max; 699 int ret = -EINVAL; 700 701 spin_lock_bh(&pernet->lock); 702 /* to keep the code simple, don't do IDR-like allocation for address ID, 703 * just bail when we exceed limits 704 */ 705 if (pernet->next_id == MAX_ADDR_ID) 706 pernet->next_id = 1; 707 if (pernet->addrs >= MPTCP_PM_ADDR_MAX) 708 goto out; 709 if (test_bit(entry->addr.id, pernet->id_bitmap)) 710 goto out; 711 712 /* do not insert duplicate address, differentiate on port only 713 * singled addresses 714 */ 715 list_for_each_entry(cur, &pernet->local_addr_list, list) { 716 if (addresses_equal(&cur->addr, &entry->addr, 717 address_use_port(entry) && 718 address_use_port(cur))) 719 goto out; 720 } 721 722 if (!entry->addr.id) { 723 find_next: 724 entry->addr.id = find_next_zero_bit(pernet->id_bitmap, 725 MAX_ADDR_ID + 1, 726 pernet->next_id); 727 if ((!entry->addr.id || entry->addr.id > MAX_ADDR_ID) && 728 pernet->next_id != 1) { 729 pernet->next_id = 1; 730 goto find_next; 731 } 732 } 733 734 if (!entry->addr.id || entry->addr.id > MAX_ADDR_ID) 735 goto out; 736 737 __set_bit(entry->addr.id, pernet->id_bitmap); 738 if (entry->addr.id > pernet->next_id) 739 pernet->next_id = entry->addr.id; 740 741 if (entry->flags & MPTCP_PM_ADDR_FLAG_SIGNAL) { 742 addr_max = pernet->add_addr_signal_max; 743 WRITE_ONCE(pernet->add_addr_signal_max, addr_max + 1); 744 } 745 if (entry->flags & MPTCP_PM_ADDR_FLAG_SUBFLOW) { 746 addr_max = pernet->local_addr_max; 747 WRITE_ONCE(pernet->local_addr_max, addr_max + 1); 748 } 749 750 pernet->addrs++; 751 list_add_tail_rcu(&entry->list, &pernet->local_addr_list); 752 ret = entry->addr.id; 753 754 out: 755 spin_unlock_bh(&pernet->lock); 756 return ret; 757 } 758 759 static int mptcp_pm_nl_create_listen_socket(struct sock *sk, 760 struct mptcp_pm_addr_entry *entry) 761 { 762 struct sockaddr_storage addr; 763 struct mptcp_sock *msk; 764 struct socket *ssock; 765 int backlog = 1024; 766 int err; 767 768 err = sock_create_kern(sock_net(sk), entry->addr.family, 769 SOCK_STREAM, IPPROTO_MPTCP, &entry->lsk); 770 if (err) 771 return err; 772 773 msk = mptcp_sk(entry->lsk->sk); 774 if (!msk) { 775 err = -EINVAL; 776 goto out; 777 } 778 779 ssock = __mptcp_nmpc_socket(msk); 780 if (!ssock) { 781 err = -EINVAL; 782 goto out; 783 } 784 785 mptcp_info2sockaddr(&entry->addr, &addr, entry->addr.family); 786 err = kernel_bind(ssock, (struct sockaddr *)&addr, 787 sizeof(struct sockaddr_in)); 788 if (err) { 789 pr_warn("kernel_bind error, err=%d", err); 790 goto out; 791 } 792 793 err = kernel_listen(ssock, backlog); 794 if (err) { 795 pr_warn("kernel_listen error, err=%d", err); 796 goto out; 797 } 798 799 return 0; 800 801 out: 802 sock_release(entry->lsk); 803 return err; 804 } 805 806 int mptcp_pm_nl_get_local_id(struct mptcp_sock *msk, struct sock_common *skc) 807 { 808 struct mptcp_pm_addr_entry *entry; 809 struct mptcp_addr_info skc_local; 810 struct mptcp_addr_info msk_local; 811 struct pm_nl_pernet *pernet; 812 int ret = -1; 813 814 if (WARN_ON_ONCE(!msk)) 815 return -1; 816 817 /* The 0 ID mapping is defined by the first subflow, copied into the msk 818 * addr 819 */ 820 local_address((struct sock_common *)msk, &msk_local); 821 local_address((struct sock_common *)skc, &skc_local); 822 if (addresses_equal(&msk_local, &skc_local, false)) 823 return 0; 824 825 if (address_zero(&skc_local)) 826 return 0; 827 828 pernet = net_generic(sock_net((struct sock *)msk), pm_nl_pernet_id); 829 830 rcu_read_lock(); 831 list_for_each_entry_rcu(entry, &pernet->local_addr_list, list) { 832 if (addresses_equal(&entry->addr, &skc_local, entry->addr.port)) { 833 ret = entry->addr.id; 834 break; 835 } 836 } 837 rcu_read_unlock(); 838 if (ret >= 0) 839 return ret; 840 841 /* address not found, add to local list */ 842 entry = kmalloc(sizeof(*entry), GFP_ATOMIC); 843 if (!entry) 844 return -ENOMEM; 845 846 entry->addr = skc_local; 847 entry->addr.id = 0; 848 entry->addr.port = 0; 849 entry->ifindex = 0; 850 entry->flags = 0; 851 entry->lsk = NULL; 852 ret = mptcp_pm_nl_append_new_local_addr(pernet, entry); 853 if (ret < 0) 854 kfree(entry); 855 856 return ret; 857 } 858 859 void mptcp_pm_nl_data_init(struct mptcp_sock *msk) 860 { 861 struct mptcp_pm_data *pm = &msk->pm; 862 bool subflows; 863 864 subflows = !!mptcp_pm_get_subflows_max(msk); 865 WRITE_ONCE(pm->work_pending, (!!mptcp_pm_get_local_addr_max(msk) && subflows) || 866 !!mptcp_pm_get_add_addr_signal_max(msk)); 867 WRITE_ONCE(pm->accept_addr, !!mptcp_pm_get_add_addr_accept_max(msk) && subflows); 868 WRITE_ONCE(pm->accept_subflow, subflows); 869 } 870 871 #define MPTCP_PM_CMD_GRP_OFFSET 0 872 #define MPTCP_PM_EV_GRP_OFFSET 1 873 874 static const struct genl_multicast_group mptcp_pm_mcgrps[] = { 875 [MPTCP_PM_CMD_GRP_OFFSET] = { .name = MPTCP_PM_CMD_GRP_NAME, }, 876 [MPTCP_PM_EV_GRP_OFFSET] = { .name = MPTCP_PM_EV_GRP_NAME, 877 .flags = GENL_UNS_ADMIN_PERM, 878 }, 879 }; 880 881 static const struct nla_policy 882 mptcp_pm_addr_policy[MPTCP_PM_ADDR_ATTR_MAX + 1] = { 883 [MPTCP_PM_ADDR_ATTR_FAMILY] = { .type = NLA_U16, }, 884 [MPTCP_PM_ADDR_ATTR_ID] = { .type = NLA_U8, }, 885 [MPTCP_PM_ADDR_ATTR_ADDR4] = { .type = NLA_U32, }, 886 [MPTCP_PM_ADDR_ATTR_ADDR6] = 887 NLA_POLICY_EXACT_LEN(sizeof(struct in6_addr)), 888 [MPTCP_PM_ADDR_ATTR_PORT] = { .type = NLA_U16 }, 889 [MPTCP_PM_ADDR_ATTR_FLAGS] = { .type = NLA_U32 }, 890 [MPTCP_PM_ADDR_ATTR_IF_IDX] = { .type = NLA_S32 }, 891 }; 892 893 static const struct nla_policy mptcp_pm_policy[MPTCP_PM_ATTR_MAX + 1] = { 894 [MPTCP_PM_ATTR_ADDR] = 895 NLA_POLICY_NESTED(mptcp_pm_addr_policy), 896 [MPTCP_PM_ATTR_RCV_ADD_ADDRS] = { .type = NLA_U32, }, 897 [MPTCP_PM_ATTR_SUBFLOWS] = { .type = NLA_U32, }, 898 }; 899 900 static int mptcp_pm_family_to_addr(int family) 901 { 902 #if IS_ENABLED(CONFIG_MPTCP_IPV6) 903 if (family == AF_INET6) 904 return MPTCP_PM_ADDR_ATTR_ADDR6; 905 #endif 906 return MPTCP_PM_ADDR_ATTR_ADDR4; 907 } 908 909 static int mptcp_pm_parse_addr(struct nlattr *attr, struct genl_info *info, 910 bool require_family, 911 struct mptcp_pm_addr_entry *entry) 912 { 913 struct nlattr *tb[MPTCP_PM_ADDR_ATTR_MAX + 1]; 914 int err, addr_addr; 915 916 if (!attr) { 917 GENL_SET_ERR_MSG(info, "missing address info"); 918 return -EINVAL; 919 } 920 921 /* no validation needed - was already done via nested policy */ 922 err = nla_parse_nested_deprecated(tb, MPTCP_PM_ADDR_ATTR_MAX, attr, 923 mptcp_pm_addr_policy, info->extack); 924 if (err) 925 return err; 926 927 memset(entry, 0, sizeof(*entry)); 928 if (!tb[MPTCP_PM_ADDR_ATTR_FAMILY]) { 929 if (!require_family) 930 goto skip_family; 931 932 NL_SET_ERR_MSG_ATTR(info->extack, attr, 933 "missing family"); 934 return -EINVAL; 935 } 936 937 entry->addr.family = nla_get_u16(tb[MPTCP_PM_ADDR_ATTR_FAMILY]); 938 if (entry->addr.family != AF_INET 939 #if IS_ENABLED(CONFIG_MPTCP_IPV6) 940 && entry->addr.family != AF_INET6 941 #endif 942 ) { 943 NL_SET_ERR_MSG_ATTR(info->extack, attr, 944 "unknown address family"); 945 return -EINVAL; 946 } 947 addr_addr = mptcp_pm_family_to_addr(entry->addr.family); 948 if (!tb[addr_addr]) { 949 NL_SET_ERR_MSG_ATTR(info->extack, attr, 950 "missing address data"); 951 return -EINVAL; 952 } 953 954 #if IS_ENABLED(CONFIG_MPTCP_IPV6) 955 if (entry->addr.family == AF_INET6) 956 entry->addr.addr6 = nla_get_in6_addr(tb[addr_addr]); 957 else 958 #endif 959 entry->addr.addr.s_addr = nla_get_in_addr(tb[addr_addr]); 960 961 skip_family: 962 if (tb[MPTCP_PM_ADDR_ATTR_IF_IDX]) { 963 u32 val = nla_get_s32(tb[MPTCP_PM_ADDR_ATTR_IF_IDX]); 964 965 entry->ifindex = val; 966 } 967 968 if (tb[MPTCP_PM_ADDR_ATTR_ID]) 969 entry->addr.id = nla_get_u8(tb[MPTCP_PM_ADDR_ATTR_ID]); 970 971 if (tb[MPTCP_PM_ADDR_ATTR_FLAGS]) 972 entry->flags = nla_get_u32(tb[MPTCP_PM_ADDR_ATTR_FLAGS]); 973 974 if (tb[MPTCP_PM_ADDR_ATTR_PORT]) 975 entry->addr.port = htons(nla_get_u16(tb[MPTCP_PM_ADDR_ATTR_PORT])); 976 977 return 0; 978 } 979 980 static struct pm_nl_pernet *genl_info_pm_nl(struct genl_info *info) 981 { 982 return net_generic(genl_info_net(info), pm_nl_pernet_id); 983 } 984 985 static int mptcp_nl_add_subflow_or_signal_addr(struct net *net) 986 { 987 struct mptcp_sock *msk; 988 long s_slot = 0, s_num = 0; 989 990 while ((msk = mptcp_token_iter_next(net, &s_slot, &s_num)) != NULL) { 991 struct sock *sk = (struct sock *)msk; 992 993 if (!READ_ONCE(msk->fully_established)) 994 goto next; 995 996 lock_sock(sk); 997 spin_lock_bh(&msk->pm.lock); 998 mptcp_pm_create_subflow_or_signal_addr(msk); 999 spin_unlock_bh(&msk->pm.lock); 1000 release_sock(sk); 1001 1002 next: 1003 sock_put(sk); 1004 cond_resched(); 1005 } 1006 1007 return 0; 1008 } 1009 1010 static int mptcp_nl_cmd_add_addr(struct sk_buff *skb, struct genl_info *info) 1011 { 1012 struct nlattr *attr = info->attrs[MPTCP_PM_ATTR_ADDR]; 1013 struct pm_nl_pernet *pernet = genl_info_pm_nl(info); 1014 struct mptcp_pm_addr_entry addr, *entry; 1015 int ret; 1016 1017 ret = mptcp_pm_parse_addr(attr, info, true, &addr); 1018 if (ret < 0) 1019 return ret; 1020 1021 entry = kmalloc(sizeof(*entry), GFP_KERNEL); 1022 if (!entry) { 1023 GENL_SET_ERR_MSG(info, "can't allocate addr"); 1024 return -ENOMEM; 1025 } 1026 1027 *entry = addr; 1028 if (entry->addr.port) { 1029 ret = mptcp_pm_nl_create_listen_socket(skb->sk, entry); 1030 if (ret) { 1031 GENL_SET_ERR_MSG(info, "create listen socket error"); 1032 kfree(entry); 1033 return ret; 1034 } 1035 } 1036 ret = mptcp_pm_nl_append_new_local_addr(pernet, entry); 1037 if (ret < 0) { 1038 GENL_SET_ERR_MSG(info, "too many addresses or duplicate one"); 1039 if (entry->lsk) 1040 sock_release(entry->lsk); 1041 kfree(entry); 1042 return ret; 1043 } 1044 1045 mptcp_nl_add_subflow_or_signal_addr(sock_net(skb->sk)); 1046 1047 return 0; 1048 } 1049 1050 static struct mptcp_pm_addr_entry * 1051 __lookup_addr_by_id(struct pm_nl_pernet *pernet, unsigned int id) 1052 { 1053 struct mptcp_pm_addr_entry *entry; 1054 1055 list_for_each_entry(entry, &pernet->local_addr_list, list) { 1056 if (entry->addr.id == id) 1057 return entry; 1058 } 1059 return NULL; 1060 } 1061 1062 static bool remove_anno_list_by_saddr(struct mptcp_sock *msk, 1063 struct mptcp_addr_info *addr) 1064 { 1065 struct mptcp_pm_add_entry *entry; 1066 1067 entry = mptcp_pm_del_add_timer(msk, addr); 1068 if (entry) { 1069 list_del(&entry->list); 1070 kfree(entry); 1071 return true; 1072 } 1073 1074 return false; 1075 } 1076 1077 static bool mptcp_pm_remove_anno_addr(struct mptcp_sock *msk, 1078 struct mptcp_addr_info *addr, 1079 bool force) 1080 { 1081 struct mptcp_rm_list list = { .nr = 0 }; 1082 bool ret; 1083 1084 list.ids[list.nr++] = addr->id; 1085 1086 ret = remove_anno_list_by_saddr(msk, addr); 1087 if (ret || force) { 1088 spin_lock_bh(&msk->pm.lock); 1089 mptcp_pm_remove_addr(msk, &list); 1090 spin_unlock_bh(&msk->pm.lock); 1091 } 1092 return ret; 1093 } 1094 1095 static int mptcp_nl_remove_subflow_and_signal_addr(struct net *net, 1096 struct mptcp_addr_info *addr) 1097 { 1098 struct mptcp_sock *msk; 1099 long s_slot = 0, s_num = 0; 1100 struct mptcp_rm_list list = { .nr = 0 }; 1101 1102 pr_debug("remove_id=%d", addr->id); 1103 1104 list.ids[list.nr++] = addr->id; 1105 1106 while ((msk = mptcp_token_iter_next(net, &s_slot, &s_num)) != NULL) { 1107 struct sock *sk = (struct sock *)msk; 1108 bool remove_subflow; 1109 1110 if (list_empty(&msk->conn_list)) { 1111 mptcp_pm_remove_anno_addr(msk, addr, false); 1112 goto next; 1113 } 1114 1115 lock_sock(sk); 1116 remove_subflow = lookup_subflow_by_saddr(&msk->conn_list, addr); 1117 mptcp_pm_remove_anno_addr(msk, addr, remove_subflow); 1118 if (remove_subflow) 1119 mptcp_pm_remove_subflow(msk, &list); 1120 release_sock(sk); 1121 1122 next: 1123 sock_put(sk); 1124 cond_resched(); 1125 } 1126 1127 return 0; 1128 } 1129 1130 struct addr_entry_release_work { 1131 struct rcu_work rwork; 1132 struct mptcp_pm_addr_entry *entry; 1133 }; 1134 1135 static void mptcp_pm_release_addr_entry(struct work_struct *work) 1136 { 1137 struct addr_entry_release_work *w; 1138 struct mptcp_pm_addr_entry *entry; 1139 1140 w = container_of(to_rcu_work(work), struct addr_entry_release_work, rwork); 1141 entry = w->entry; 1142 if (entry) { 1143 if (entry->lsk) 1144 sock_release(entry->lsk); 1145 kfree(entry); 1146 } 1147 kfree(w); 1148 } 1149 1150 static void mptcp_pm_free_addr_entry(struct mptcp_pm_addr_entry *entry) 1151 { 1152 struct addr_entry_release_work *w; 1153 1154 w = kmalloc(sizeof(*w), GFP_ATOMIC); 1155 if (w) { 1156 INIT_RCU_WORK(&w->rwork, mptcp_pm_release_addr_entry); 1157 w->entry = entry; 1158 queue_rcu_work(system_wq, &w->rwork); 1159 } 1160 } 1161 1162 static int mptcp_nl_remove_id_zero_address(struct net *net, 1163 struct mptcp_addr_info *addr) 1164 { 1165 struct mptcp_rm_list list = { .nr = 0 }; 1166 long s_slot = 0, s_num = 0; 1167 struct mptcp_sock *msk; 1168 1169 list.ids[list.nr++] = 0; 1170 1171 while ((msk = mptcp_token_iter_next(net, &s_slot, &s_num)) != NULL) { 1172 struct sock *sk = (struct sock *)msk; 1173 struct mptcp_addr_info msk_local; 1174 1175 if (list_empty(&msk->conn_list)) 1176 goto next; 1177 1178 local_address((struct sock_common *)msk, &msk_local); 1179 if (!addresses_equal(&msk_local, addr, addr->port)) 1180 goto next; 1181 1182 lock_sock(sk); 1183 spin_lock_bh(&msk->pm.lock); 1184 mptcp_pm_remove_addr(msk, &list); 1185 mptcp_pm_nl_rm_subflow_received(msk, &list); 1186 spin_unlock_bh(&msk->pm.lock); 1187 release_sock(sk); 1188 1189 next: 1190 sock_put(sk); 1191 cond_resched(); 1192 } 1193 1194 return 0; 1195 } 1196 1197 static int mptcp_nl_cmd_del_addr(struct sk_buff *skb, struct genl_info *info) 1198 { 1199 struct nlattr *attr = info->attrs[MPTCP_PM_ATTR_ADDR]; 1200 struct pm_nl_pernet *pernet = genl_info_pm_nl(info); 1201 struct mptcp_pm_addr_entry addr, *entry; 1202 unsigned int addr_max; 1203 int ret; 1204 1205 ret = mptcp_pm_parse_addr(attr, info, false, &addr); 1206 if (ret < 0) 1207 return ret; 1208 1209 /* the zero id address is special: the first address used by the msk 1210 * always gets such an id, so different subflows can have different zero 1211 * id addresses. Additionally zero id is not accounted for in id_bitmap. 1212 * Let's use an 'mptcp_rm_list' instead of the common remove code. 1213 */ 1214 if (addr.addr.id == 0) 1215 return mptcp_nl_remove_id_zero_address(sock_net(skb->sk), &addr.addr); 1216 1217 spin_lock_bh(&pernet->lock); 1218 entry = __lookup_addr_by_id(pernet, addr.addr.id); 1219 if (!entry) { 1220 GENL_SET_ERR_MSG(info, "address not found"); 1221 spin_unlock_bh(&pernet->lock); 1222 return -EINVAL; 1223 } 1224 if (entry->flags & MPTCP_PM_ADDR_FLAG_SIGNAL) { 1225 addr_max = pernet->add_addr_signal_max; 1226 WRITE_ONCE(pernet->add_addr_signal_max, addr_max - 1); 1227 } 1228 if (entry->flags & MPTCP_PM_ADDR_FLAG_SUBFLOW) { 1229 addr_max = pernet->local_addr_max; 1230 WRITE_ONCE(pernet->local_addr_max, addr_max - 1); 1231 } 1232 1233 pernet->addrs--; 1234 list_del_rcu(&entry->list); 1235 __clear_bit(entry->addr.id, pernet->id_bitmap); 1236 spin_unlock_bh(&pernet->lock); 1237 1238 mptcp_nl_remove_subflow_and_signal_addr(sock_net(skb->sk), &entry->addr); 1239 mptcp_pm_free_addr_entry(entry); 1240 1241 return ret; 1242 } 1243 1244 static void mptcp_pm_remove_addrs_and_subflows(struct mptcp_sock *msk, 1245 struct list_head *rm_list) 1246 { 1247 struct mptcp_rm_list alist = { .nr = 0 }, slist = { .nr = 0 }; 1248 struct mptcp_pm_addr_entry *entry; 1249 1250 list_for_each_entry(entry, rm_list, list) { 1251 if (lookup_subflow_by_saddr(&msk->conn_list, &entry->addr) && 1252 alist.nr < MPTCP_RM_IDS_MAX && 1253 slist.nr < MPTCP_RM_IDS_MAX) { 1254 alist.ids[alist.nr++] = entry->addr.id; 1255 slist.ids[slist.nr++] = entry->addr.id; 1256 } else if (remove_anno_list_by_saddr(msk, &entry->addr) && 1257 alist.nr < MPTCP_RM_IDS_MAX) { 1258 alist.ids[alist.nr++] = entry->addr.id; 1259 } 1260 } 1261 1262 if (alist.nr) { 1263 spin_lock_bh(&msk->pm.lock); 1264 mptcp_pm_remove_addr(msk, &alist); 1265 spin_unlock_bh(&msk->pm.lock); 1266 } 1267 if (slist.nr) 1268 mptcp_pm_remove_subflow(msk, &slist); 1269 } 1270 1271 static void mptcp_nl_remove_addrs_list(struct net *net, 1272 struct list_head *rm_list) 1273 { 1274 long s_slot = 0, s_num = 0; 1275 struct mptcp_sock *msk; 1276 1277 if (list_empty(rm_list)) 1278 return; 1279 1280 while ((msk = mptcp_token_iter_next(net, &s_slot, &s_num)) != NULL) { 1281 struct sock *sk = (struct sock *)msk; 1282 1283 lock_sock(sk); 1284 mptcp_pm_remove_addrs_and_subflows(msk, rm_list); 1285 release_sock(sk); 1286 1287 sock_put(sk); 1288 cond_resched(); 1289 } 1290 } 1291 1292 static void __flush_addrs(struct list_head *list) 1293 { 1294 while (!list_empty(list)) { 1295 struct mptcp_pm_addr_entry *cur; 1296 1297 cur = list_entry(list->next, 1298 struct mptcp_pm_addr_entry, list); 1299 list_del_rcu(&cur->list); 1300 mptcp_pm_free_addr_entry(cur); 1301 } 1302 } 1303 1304 static void __reset_counters(struct pm_nl_pernet *pernet) 1305 { 1306 WRITE_ONCE(pernet->add_addr_signal_max, 0); 1307 WRITE_ONCE(pernet->add_addr_accept_max, 0); 1308 WRITE_ONCE(pernet->local_addr_max, 0); 1309 pernet->addrs = 0; 1310 } 1311 1312 static int mptcp_nl_cmd_flush_addrs(struct sk_buff *skb, struct genl_info *info) 1313 { 1314 struct pm_nl_pernet *pernet = genl_info_pm_nl(info); 1315 LIST_HEAD(free_list); 1316 1317 spin_lock_bh(&pernet->lock); 1318 list_splice_init(&pernet->local_addr_list, &free_list); 1319 __reset_counters(pernet); 1320 pernet->next_id = 1; 1321 bitmap_zero(pernet->id_bitmap, MAX_ADDR_ID + 1); 1322 spin_unlock_bh(&pernet->lock); 1323 mptcp_nl_remove_addrs_list(sock_net(skb->sk), &free_list); 1324 __flush_addrs(&free_list); 1325 return 0; 1326 } 1327 1328 static int mptcp_nl_fill_addr(struct sk_buff *skb, 1329 struct mptcp_pm_addr_entry *entry) 1330 { 1331 struct mptcp_addr_info *addr = &entry->addr; 1332 struct nlattr *attr; 1333 1334 attr = nla_nest_start(skb, MPTCP_PM_ATTR_ADDR); 1335 if (!attr) 1336 return -EMSGSIZE; 1337 1338 if (nla_put_u16(skb, MPTCP_PM_ADDR_ATTR_FAMILY, addr->family)) 1339 goto nla_put_failure; 1340 if (nla_put_u16(skb, MPTCP_PM_ADDR_ATTR_PORT, ntohs(addr->port))) 1341 goto nla_put_failure; 1342 if (nla_put_u8(skb, MPTCP_PM_ADDR_ATTR_ID, addr->id)) 1343 goto nla_put_failure; 1344 if (nla_put_u32(skb, MPTCP_PM_ADDR_ATTR_FLAGS, entry->flags)) 1345 goto nla_put_failure; 1346 if (entry->ifindex && 1347 nla_put_s32(skb, MPTCP_PM_ADDR_ATTR_IF_IDX, entry->ifindex)) 1348 goto nla_put_failure; 1349 1350 if (addr->family == AF_INET && 1351 nla_put_in_addr(skb, MPTCP_PM_ADDR_ATTR_ADDR4, 1352 addr->addr.s_addr)) 1353 goto nla_put_failure; 1354 #if IS_ENABLED(CONFIG_MPTCP_IPV6) 1355 else if (addr->family == AF_INET6 && 1356 nla_put_in6_addr(skb, MPTCP_PM_ADDR_ATTR_ADDR6, &addr->addr6)) 1357 goto nla_put_failure; 1358 #endif 1359 nla_nest_end(skb, attr); 1360 return 0; 1361 1362 nla_put_failure: 1363 nla_nest_cancel(skb, attr); 1364 return -EMSGSIZE; 1365 } 1366 1367 static int mptcp_nl_cmd_get_addr(struct sk_buff *skb, struct genl_info *info) 1368 { 1369 struct nlattr *attr = info->attrs[MPTCP_PM_ATTR_ADDR]; 1370 struct pm_nl_pernet *pernet = genl_info_pm_nl(info); 1371 struct mptcp_pm_addr_entry addr, *entry; 1372 struct sk_buff *msg; 1373 void *reply; 1374 int ret; 1375 1376 ret = mptcp_pm_parse_addr(attr, info, false, &addr); 1377 if (ret < 0) 1378 return ret; 1379 1380 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1381 if (!msg) 1382 return -ENOMEM; 1383 1384 reply = genlmsg_put_reply(msg, info, &mptcp_genl_family, 0, 1385 info->genlhdr->cmd); 1386 if (!reply) { 1387 GENL_SET_ERR_MSG(info, "not enough space in Netlink message"); 1388 ret = -EMSGSIZE; 1389 goto fail; 1390 } 1391 1392 spin_lock_bh(&pernet->lock); 1393 entry = __lookup_addr_by_id(pernet, addr.addr.id); 1394 if (!entry) { 1395 GENL_SET_ERR_MSG(info, "address not found"); 1396 ret = -EINVAL; 1397 goto unlock_fail; 1398 } 1399 1400 ret = mptcp_nl_fill_addr(msg, entry); 1401 if (ret) 1402 goto unlock_fail; 1403 1404 genlmsg_end(msg, reply); 1405 ret = genlmsg_reply(msg, info); 1406 spin_unlock_bh(&pernet->lock); 1407 return ret; 1408 1409 unlock_fail: 1410 spin_unlock_bh(&pernet->lock); 1411 1412 fail: 1413 nlmsg_free(msg); 1414 return ret; 1415 } 1416 1417 static int mptcp_nl_cmd_dump_addrs(struct sk_buff *msg, 1418 struct netlink_callback *cb) 1419 { 1420 struct net *net = sock_net(msg->sk); 1421 struct mptcp_pm_addr_entry *entry; 1422 struct pm_nl_pernet *pernet; 1423 int id = cb->args[0]; 1424 void *hdr; 1425 int i; 1426 1427 pernet = net_generic(net, pm_nl_pernet_id); 1428 1429 spin_lock_bh(&pernet->lock); 1430 for (i = id; i < MAX_ADDR_ID + 1; i++) { 1431 if (test_bit(i, pernet->id_bitmap)) { 1432 entry = __lookup_addr_by_id(pernet, i); 1433 if (!entry) 1434 break; 1435 1436 if (entry->addr.id <= id) 1437 continue; 1438 1439 hdr = genlmsg_put(msg, NETLINK_CB(cb->skb).portid, 1440 cb->nlh->nlmsg_seq, &mptcp_genl_family, 1441 NLM_F_MULTI, MPTCP_PM_CMD_GET_ADDR); 1442 if (!hdr) 1443 break; 1444 1445 if (mptcp_nl_fill_addr(msg, entry) < 0) { 1446 genlmsg_cancel(msg, hdr); 1447 break; 1448 } 1449 1450 id = entry->addr.id; 1451 genlmsg_end(msg, hdr); 1452 } 1453 } 1454 spin_unlock_bh(&pernet->lock); 1455 1456 cb->args[0] = id; 1457 return msg->len; 1458 } 1459 1460 static int parse_limit(struct genl_info *info, int id, unsigned int *limit) 1461 { 1462 struct nlattr *attr = info->attrs[id]; 1463 1464 if (!attr) 1465 return 0; 1466 1467 *limit = nla_get_u32(attr); 1468 if (*limit > MPTCP_PM_ADDR_MAX) { 1469 GENL_SET_ERR_MSG(info, "limit greater than maximum"); 1470 return -EINVAL; 1471 } 1472 return 0; 1473 } 1474 1475 static int 1476 mptcp_nl_cmd_set_limits(struct sk_buff *skb, struct genl_info *info) 1477 { 1478 struct pm_nl_pernet *pernet = genl_info_pm_nl(info); 1479 unsigned int rcv_addrs, subflows; 1480 int ret; 1481 1482 spin_lock_bh(&pernet->lock); 1483 rcv_addrs = pernet->add_addr_accept_max; 1484 ret = parse_limit(info, MPTCP_PM_ATTR_RCV_ADD_ADDRS, &rcv_addrs); 1485 if (ret) 1486 goto unlock; 1487 1488 subflows = pernet->subflows_max; 1489 ret = parse_limit(info, MPTCP_PM_ATTR_SUBFLOWS, &subflows); 1490 if (ret) 1491 goto unlock; 1492 1493 WRITE_ONCE(pernet->add_addr_accept_max, rcv_addrs); 1494 WRITE_ONCE(pernet->subflows_max, subflows); 1495 1496 unlock: 1497 spin_unlock_bh(&pernet->lock); 1498 return ret; 1499 } 1500 1501 static int 1502 mptcp_nl_cmd_get_limits(struct sk_buff *skb, struct genl_info *info) 1503 { 1504 struct pm_nl_pernet *pernet = genl_info_pm_nl(info); 1505 struct sk_buff *msg; 1506 void *reply; 1507 1508 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1509 if (!msg) 1510 return -ENOMEM; 1511 1512 reply = genlmsg_put_reply(msg, info, &mptcp_genl_family, 0, 1513 MPTCP_PM_CMD_GET_LIMITS); 1514 if (!reply) 1515 goto fail; 1516 1517 if (nla_put_u32(msg, MPTCP_PM_ATTR_RCV_ADD_ADDRS, 1518 READ_ONCE(pernet->add_addr_accept_max))) 1519 goto fail; 1520 1521 if (nla_put_u32(msg, MPTCP_PM_ATTR_SUBFLOWS, 1522 READ_ONCE(pernet->subflows_max))) 1523 goto fail; 1524 1525 genlmsg_end(msg, reply); 1526 return genlmsg_reply(msg, info); 1527 1528 fail: 1529 GENL_SET_ERR_MSG(info, "not enough space in Netlink message"); 1530 nlmsg_free(msg); 1531 return -EMSGSIZE; 1532 } 1533 1534 static int mptcp_nl_addr_backup(struct net *net, 1535 struct mptcp_addr_info *addr, 1536 u8 bkup) 1537 { 1538 long s_slot = 0, s_num = 0; 1539 struct mptcp_sock *msk; 1540 int ret = -EINVAL; 1541 1542 while ((msk = mptcp_token_iter_next(net, &s_slot, &s_num)) != NULL) { 1543 struct sock *sk = (struct sock *)msk; 1544 1545 if (list_empty(&msk->conn_list)) 1546 goto next; 1547 1548 lock_sock(sk); 1549 spin_lock_bh(&msk->pm.lock); 1550 ret = mptcp_pm_nl_mp_prio_send_ack(msk, addr, bkup); 1551 spin_unlock_bh(&msk->pm.lock); 1552 release_sock(sk); 1553 1554 next: 1555 sock_put(sk); 1556 cond_resched(); 1557 } 1558 1559 return ret; 1560 } 1561 1562 static int mptcp_nl_cmd_set_flags(struct sk_buff *skb, struct genl_info *info) 1563 { 1564 struct nlattr *attr = info->attrs[MPTCP_PM_ATTR_ADDR]; 1565 struct pm_nl_pernet *pernet = genl_info_pm_nl(info); 1566 struct mptcp_pm_addr_entry addr, *entry; 1567 struct net *net = sock_net(skb->sk); 1568 u8 bkup = 0; 1569 int ret; 1570 1571 ret = mptcp_pm_parse_addr(attr, info, true, &addr); 1572 if (ret < 0) 1573 return ret; 1574 1575 if (addr.flags & MPTCP_PM_ADDR_FLAG_BACKUP) 1576 bkup = 1; 1577 1578 list_for_each_entry(entry, &pernet->local_addr_list, list) { 1579 if (addresses_equal(&entry->addr, &addr.addr, true)) { 1580 ret = mptcp_nl_addr_backup(net, &entry->addr, bkup); 1581 if (ret) 1582 return ret; 1583 1584 if (bkup) 1585 entry->flags |= MPTCP_PM_ADDR_FLAG_BACKUP; 1586 else 1587 entry->flags &= ~MPTCP_PM_ADDR_FLAG_BACKUP; 1588 } 1589 } 1590 1591 return 0; 1592 } 1593 1594 static void mptcp_nl_mcast_send(struct net *net, struct sk_buff *nlskb, gfp_t gfp) 1595 { 1596 genlmsg_multicast_netns(&mptcp_genl_family, net, 1597 nlskb, 0, MPTCP_PM_EV_GRP_OFFSET, gfp); 1598 } 1599 1600 static int mptcp_event_add_subflow(struct sk_buff *skb, const struct sock *ssk) 1601 { 1602 const struct inet_sock *issk = inet_sk(ssk); 1603 const struct mptcp_subflow_context *sf; 1604 1605 if (nla_put_u16(skb, MPTCP_ATTR_FAMILY, ssk->sk_family)) 1606 return -EMSGSIZE; 1607 1608 switch (ssk->sk_family) { 1609 case AF_INET: 1610 if (nla_put_in_addr(skb, MPTCP_ATTR_SADDR4, issk->inet_saddr)) 1611 return -EMSGSIZE; 1612 if (nla_put_in_addr(skb, MPTCP_ATTR_DADDR4, issk->inet_daddr)) 1613 return -EMSGSIZE; 1614 break; 1615 #if IS_ENABLED(CONFIG_MPTCP_IPV6) 1616 case AF_INET6: { 1617 const struct ipv6_pinfo *np = inet6_sk(ssk); 1618 1619 if (nla_put_in6_addr(skb, MPTCP_ATTR_SADDR6, &np->saddr)) 1620 return -EMSGSIZE; 1621 if (nla_put_in6_addr(skb, MPTCP_ATTR_DADDR6, &ssk->sk_v6_daddr)) 1622 return -EMSGSIZE; 1623 break; 1624 } 1625 #endif 1626 default: 1627 WARN_ON_ONCE(1); 1628 return -EMSGSIZE; 1629 } 1630 1631 if (nla_put_be16(skb, MPTCP_ATTR_SPORT, issk->inet_sport)) 1632 return -EMSGSIZE; 1633 if (nla_put_be16(skb, MPTCP_ATTR_DPORT, issk->inet_dport)) 1634 return -EMSGSIZE; 1635 1636 sf = mptcp_subflow_ctx(ssk); 1637 if (WARN_ON_ONCE(!sf)) 1638 return -EINVAL; 1639 1640 if (nla_put_u8(skb, MPTCP_ATTR_LOC_ID, sf->local_id)) 1641 return -EMSGSIZE; 1642 1643 if (nla_put_u8(skb, MPTCP_ATTR_REM_ID, sf->remote_id)) 1644 return -EMSGSIZE; 1645 1646 return 0; 1647 } 1648 1649 static int mptcp_event_put_token_and_ssk(struct sk_buff *skb, 1650 const struct mptcp_sock *msk, 1651 const struct sock *ssk) 1652 { 1653 const struct sock *sk = (const struct sock *)msk; 1654 const struct mptcp_subflow_context *sf; 1655 u8 sk_err; 1656 1657 if (nla_put_u32(skb, MPTCP_ATTR_TOKEN, msk->token)) 1658 return -EMSGSIZE; 1659 1660 if (mptcp_event_add_subflow(skb, ssk)) 1661 return -EMSGSIZE; 1662 1663 sf = mptcp_subflow_ctx(ssk); 1664 if (WARN_ON_ONCE(!sf)) 1665 return -EINVAL; 1666 1667 if (nla_put_u8(skb, MPTCP_ATTR_BACKUP, sf->backup)) 1668 return -EMSGSIZE; 1669 1670 if (ssk->sk_bound_dev_if && 1671 nla_put_s32(skb, MPTCP_ATTR_IF_IDX, ssk->sk_bound_dev_if)) 1672 return -EMSGSIZE; 1673 1674 sk_err = ssk->sk_err; 1675 if (sk_err && sk->sk_state == TCP_ESTABLISHED && 1676 nla_put_u8(skb, MPTCP_ATTR_ERROR, sk_err)) 1677 return -EMSGSIZE; 1678 1679 return 0; 1680 } 1681 1682 static int mptcp_event_sub_established(struct sk_buff *skb, 1683 const struct mptcp_sock *msk, 1684 const struct sock *ssk) 1685 { 1686 return mptcp_event_put_token_and_ssk(skb, msk, ssk); 1687 } 1688 1689 static int mptcp_event_sub_closed(struct sk_buff *skb, 1690 const struct mptcp_sock *msk, 1691 const struct sock *ssk) 1692 { 1693 const struct mptcp_subflow_context *sf; 1694 1695 if (mptcp_event_put_token_and_ssk(skb, msk, ssk)) 1696 return -EMSGSIZE; 1697 1698 sf = mptcp_subflow_ctx(ssk); 1699 if (!sf->reset_seen) 1700 return 0; 1701 1702 if (nla_put_u32(skb, MPTCP_ATTR_RESET_REASON, sf->reset_reason)) 1703 return -EMSGSIZE; 1704 1705 if (nla_put_u32(skb, MPTCP_ATTR_RESET_FLAGS, sf->reset_transient)) 1706 return -EMSGSIZE; 1707 1708 return 0; 1709 } 1710 1711 static int mptcp_event_created(struct sk_buff *skb, 1712 const struct mptcp_sock *msk, 1713 const struct sock *ssk) 1714 { 1715 int err = nla_put_u32(skb, MPTCP_ATTR_TOKEN, msk->token); 1716 1717 if (err) 1718 return err; 1719 1720 return mptcp_event_add_subflow(skb, ssk); 1721 } 1722 1723 void mptcp_event_addr_removed(const struct mptcp_sock *msk, uint8_t id) 1724 { 1725 struct net *net = sock_net((const struct sock *)msk); 1726 struct nlmsghdr *nlh; 1727 struct sk_buff *skb; 1728 1729 if (!genl_has_listeners(&mptcp_genl_family, net, MPTCP_PM_EV_GRP_OFFSET)) 1730 return; 1731 1732 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 1733 if (!skb) 1734 return; 1735 1736 nlh = genlmsg_put(skb, 0, 0, &mptcp_genl_family, 0, MPTCP_EVENT_REMOVED); 1737 if (!nlh) 1738 goto nla_put_failure; 1739 1740 if (nla_put_u32(skb, MPTCP_ATTR_TOKEN, msk->token)) 1741 goto nla_put_failure; 1742 1743 if (nla_put_u8(skb, MPTCP_ATTR_REM_ID, id)) 1744 goto nla_put_failure; 1745 1746 genlmsg_end(skb, nlh); 1747 mptcp_nl_mcast_send(net, skb, GFP_ATOMIC); 1748 return; 1749 1750 nla_put_failure: 1751 kfree_skb(skb); 1752 } 1753 1754 void mptcp_event_addr_announced(const struct mptcp_sock *msk, 1755 const struct mptcp_addr_info *info) 1756 { 1757 struct net *net = sock_net((const struct sock *)msk); 1758 struct nlmsghdr *nlh; 1759 struct sk_buff *skb; 1760 1761 if (!genl_has_listeners(&mptcp_genl_family, net, MPTCP_PM_EV_GRP_OFFSET)) 1762 return; 1763 1764 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 1765 if (!skb) 1766 return; 1767 1768 nlh = genlmsg_put(skb, 0, 0, &mptcp_genl_family, 0, 1769 MPTCP_EVENT_ANNOUNCED); 1770 if (!nlh) 1771 goto nla_put_failure; 1772 1773 if (nla_put_u32(skb, MPTCP_ATTR_TOKEN, msk->token)) 1774 goto nla_put_failure; 1775 1776 if (nla_put_u8(skb, MPTCP_ATTR_REM_ID, info->id)) 1777 goto nla_put_failure; 1778 1779 if (nla_put_be16(skb, MPTCP_ATTR_DPORT, info->port)) 1780 goto nla_put_failure; 1781 1782 switch (info->family) { 1783 case AF_INET: 1784 if (nla_put_in_addr(skb, MPTCP_ATTR_DADDR4, info->addr.s_addr)) 1785 goto nla_put_failure; 1786 break; 1787 #if IS_ENABLED(CONFIG_MPTCP_IPV6) 1788 case AF_INET6: 1789 if (nla_put_in6_addr(skb, MPTCP_ATTR_DADDR6, &info->addr6)) 1790 goto nla_put_failure; 1791 break; 1792 #endif 1793 default: 1794 WARN_ON_ONCE(1); 1795 goto nla_put_failure; 1796 } 1797 1798 genlmsg_end(skb, nlh); 1799 mptcp_nl_mcast_send(net, skb, GFP_ATOMIC); 1800 return; 1801 1802 nla_put_failure: 1803 kfree_skb(skb); 1804 } 1805 1806 void mptcp_event(enum mptcp_event_type type, const struct mptcp_sock *msk, 1807 const struct sock *ssk, gfp_t gfp) 1808 { 1809 struct net *net = sock_net((const struct sock *)msk); 1810 struct nlmsghdr *nlh; 1811 struct sk_buff *skb; 1812 1813 if (!genl_has_listeners(&mptcp_genl_family, net, MPTCP_PM_EV_GRP_OFFSET)) 1814 return; 1815 1816 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, gfp); 1817 if (!skb) 1818 return; 1819 1820 nlh = genlmsg_put(skb, 0, 0, &mptcp_genl_family, 0, type); 1821 if (!nlh) 1822 goto nla_put_failure; 1823 1824 switch (type) { 1825 case MPTCP_EVENT_UNSPEC: 1826 WARN_ON_ONCE(1); 1827 break; 1828 case MPTCP_EVENT_CREATED: 1829 case MPTCP_EVENT_ESTABLISHED: 1830 if (mptcp_event_created(skb, msk, ssk) < 0) 1831 goto nla_put_failure; 1832 break; 1833 case MPTCP_EVENT_CLOSED: 1834 if (nla_put_u32(skb, MPTCP_ATTR_TOKEN, msk->token) < 0) 1835 goto nla_put_failure; 1836 break; 1837 case MPTCP_EVENT_ANNOUNCED: 1838 case MPTCP_EVENT_REMOVED: 1839 /* call mptcp_event_addr_announced()/removed instead */ 1840 WARN_ON_ONCE(1); 1841 break; 1842 case MPTCP_EVENT_SUB_ESTABLISHED: 1843 case MPTCP_EVENT_SUB_PRIORITY: 1844 if (mptcp_event_sub_established(skb, msk, ssk) < 0) 1845 goto nla_put_failure; 1846 break; 1847 case MPTCP_EVENT_SUB_CLOSED: 1848 if (mptcp_event_sub_closed(skb, msk, ssk) < 0) 1849 goto nla_put_failure; 1850 break; 1851 } 1852 1853 genlmsg_end(skb, nlh); 1854 mptcp_nl_mcast_send(net, skb, gfp); 1855 return; 1856 1857 nla_put_failure: 1858 kfree_skb(skb); 1859 } 1860 1861 static const struct genl_small_ops mptcp_pm_ops[] = { 1862 { 1863 .cmd = MPTCP_PM_CMD_ADD_ADDR, 1864 .doit = mptcp_nl_cmd_add_addr, 1865 .flags = GENL_ADMIN_PERM, 1866 }, 1867 { 1868 .cmd = MPTCP_PM_CMD_DEL_ADDR, 1869 .doit = mptcp_nl_cmd_del_addr, 1870 .flags = GENL_ADMIN_PERM, 1871 }, 1872 { 1873 .cmd = MPTCP_PM_CMD_FLUSH_ADDRS, 1874 .doit = mptcp_nl_cmd_flush_addrs, 1875 .flags = GENL_ADMIN_PERM, 1876 }, 1877 { 1878 .cmd = MPTCP_PM_CMD_GET_ADDR, 1879 .doit = mptcp_nl_cmd_get_addr, 1880 .dumpit = mptcp_nl_cmd_dump_addrs, 1881 }, 1882 { 1883 .cmd = MPTCP_PM_CMD_SET_LIMITS, 1884 .doit = mptcp_nl_cmd_set_limits, 1885 .flags = GENL_ADMIN_PERM, 1886 }, 1887 { 1888 .cmd = MPTCP_PM_CMD_GET_LIMITS, 1889 .doit = mptcp_nl_cmd_get_limits, 1890 }, 1891 { 1892 .cmd = MPTCP_PM_CMD_SET_FLAGS, 1893 .doit = mptcp_nl_cmd_set_flags, 1894 .flags = GENL_ADMIN_PERM, 1895 }, 1896 }; 1897 1898 static struct genl_family mptcp_genl_family __ro_after_init = { 1899 .name = MPTCP_PM_NAME, 1900 .version = MPTCP_PM_VER, 1901 .maxattr = MPTCP_PM_ATTR_MAX, 1902 .policy = mptcp_pm_policy, 1903 .netnsok = true, 1904 .module = THIS_MODULE, 1905 .small_ops = mptcp_pm_ops, 1906 .n_small_ops = ARRAY_SIZE(mptcp_pm_ops), 1907 .mcgrps = mptcp_pm_mcgrps, 1908 .n_mcgrps = ARRAY_SIZE(mptcp_pm_mcgrps), 1909 }; 1910 1911 static int __net_init pm_nl_init_net(struct net *net) 1912 { 1913 struct pm_nl_pernet *pernet = net_generic(net, pm_nl_pernet_id); 1914 1915 INIT_LIST_HEAD_RCU(&pernet->local_addr_list); 1916 __reset_counters(pernet); 1917 pernet->next_id = 1; 1918 bitmap_zero(pernet->id_bitmap, MAX_ADDR_ID + 1); 1919 spin_lock_init(&pernet->lock); 1920 return 0; 1921 } 1922 1923 static void __net_exit pm_nl_exit_net(struct list_head *net_list) 1924 { 1925 struct net *net; 1926 1927 list_for_each_entry(net, net_list, exit_list) { 1928 struct pm_nl_pernet *pernet = net_generic(net, pm_nl_pernet_id); 1929 1930 /* net is removed from namespace list, can't race with 1931 * other modifiers 1932 */ 1933 __flush_addrs(&pernet->local_addr_list); 1934 } 1935 } 1936 1937 static struct pernet_operations mptcp_pm_pernet_ops = { 1938 .init = pm_nl_init_net, 1939 .exit_batch = pm_nl_exit_net, 1940 .id = &pm_nl_pernet_id, 1941 .size = sizeof(struct pm_nl_pernet), 1942 }; 1943 1944 void __init mptcp_pm_nl_init(void) 1945 { 1946 if (register_pernet_subsys(&mptcp_pm_pernet_ops) < 0) 1947 panic("Failed to register MPTCP PM pernet subsystem.\n"); 1948 1949 if (genl_register_family(&mptcp_genl_family)) 1950 panic("Failed to register MPTCP PM netlink family\n"); 1951 } 1952