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 socket *lsk; 31 }; 32 33 struct mptcp_pm_add_entry { 34 struct list_head list; 35 struct mptcp_addr_info addr; 36 struct timer_list add_timer; 37 struct mptcp_sock *sock; 38 u8 retrans_times; 39 }; 40 41 #define MAX_ADDR_ID 255 42 #define BITMAP_SZ DIV_ROUND_UP(MAX_ADDR_ID + 1, BITS_PER_LONG) 43 44 struct pm_nl_pernet { 45 /* protects pernet updates */ 46 spinlock_t lock; 47 struct list_head local_addr_list; 48 unsigned int addrs; 49 unsigned int add_addr_signal_max; 50 unsigned int add_addr_accept_max; 51 unsigned int local_addr_max; 52 unsigned int subflows_max; 53 unsigned int next_id; 54 unsigned long id_bitmap[BITMAP_SZ]; 55 }; 56 57 #define MPTCP_PM_ADDR_MAX 8 58 #define ADD_ADDR_RETRANS_MAX 3 59 60 static bool addresses_equal(const struct mptcp_addr_info *a, 61 struct mptcp_addr_info *b, bool use_port) 62 { 63 bool addr_equals = false; 64 65 if (a->family == b->family) { 66 if (a->family == AF_INET) 67 addr_equals = a->addr.s_addr == b->addr.s_addr; 68 #if IS_ENABLED(CONFIG_MPTCP_IPV6) 69 else 70 addr_equals = !ipv6_addr_cmp(&a->addr6, &b->addr6); 71 } else if (a->family == AF_INET) { 72 if (ipv6_addr_v4mapped(&b->addr6)) 73 addr_equals = a->addr.s_addr == b->addr6.s6_addr32[3]; 74 } else if (b->family == AF_INET) { 75 if (ipv6_addr_v4mapped(&a->addr6)) 76 addr_equals = a->addr6.s6_addr32[3] == b->addr.s_addr; 77 #endif 78 } 79 80 if (!addr_equals) 81 return false; 82 if (!use_port) 83 return true; 84 85 return a->port == b->port; 86 } 87 88 static bool address_zero(const struct mptcp_addr_info *addr) 89 { 90 struct mptcp_addr_info zero; 91 92 memset(&zero, 0, sizeof(zero)); 93 zero.family = addr->family; 94 95 return addresses_equal(addr, &zero, true); 96 } 97 98 static void local_address(const struct sock_common *skc, 99 struct mptcp_addr_info *addr) 100 { 101 addr->family = skc->skc_family; 102 addr->port = htons(skc->skc_num); 103 if (addr->family == AF_INET) 104 addr->addr.s_addr = skc->skc_rcv_saddr; 105 #if IS_ENABLED(CONFIG_MPTCP_IPV6) 106 else if (addr->family == AF_INET6) 107 addr->addr6 = skc->skc_v6_rcv_saddr; 108 #endif 109 } 110 111 static void remote_address(const struct sock_common *skc, 112 struct mptcp_addr_info *addr) 113 { 114 addr->family = skc->skc_family; 115 addr->port = skc->skc_dport; 116 if (addr->family == AF_INET) 117 addr->addr.s_addr = skc->skc_daddr; 118 #if IS_ENABLED(CONFIG_MPTCP_IPV6) 119 else if (addr->family == AF_INET6) 120 addr->addr6 = skc->skc_v6_daddr; 121 #endif 122 } 123 124 static bool lookup_subflow_by_saddr(const struct list_head *list, 125 struct mptcp_addr_info *saddr) 126 { 127 struct mptcp_subflow_context *subflow; 128 struct mptcp_addr_info cur; 129 struct sock_common *skc; 130 131 list_for_each_entry(subflow, list, node) { 132 skc = (struct sock_common *)mptcp_subflow_tcp_sock(subflow); 133 134 local_address(skc, &cur); 135 if (addresses_equal(&cur, saddr, saddr->port)) 136 return true; 137 } 138 139 return false; 140 } 141 142 static bool lookup_subflow_by_daddr(const struct list_head *list, 143 struct mptcp_addr_info *daddr) 144 { 145 struct mptcp_subflow_context *subflow; 146 struct mptcp_addr_info cur; 147 struct sock_common *skc; 148 149 list_for_each_entry(subflow, list, node) { 150 skc = (struct sock_common *)mptcp_subflow_tcp_sock(subflow); 151 152 remote_address(skc, &cur); 153 if (addresses_equal(&cur, daddr, daddr->port)) 154 return true; 155 } 156 157 return false; 158 } 159 160 static struct mptcp_pm_addr_entry * 161 select_local_address(const struct pm_nl_pernet *pernet, 162 struct mptcp_sock *msk) 163 { 164 struct mptcp_pm_addr_entry *entry, *ret = NULL; 165 struct sock *sk = (struct sock *)msk; 166 167 msk_owned_by_me(msk); 168 169 rcu_read_lock(); 170 __mptcp_flush_join_list(msk); 171 list_for_each_entry_rcu(entry, &pernet->local_addr_list, list) { 172 if (!(entry->flags & MPTCP_PM_ADDR_FLAG_SUBFLOW)) 173 continue; 174 175 if (entry->addr.family != sk->sk_family) { 176 #if IS_ENABLED(CONFIG_MPTCP_IPV6) 177 if ((entry->addr.family == AF_INET && 178 !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) || 179 (sk->sk_family == AF_INET && 180 !ipv6_addr_v4mapped(&entry->addr.addr6))) 181 #endif 182 continue; 183 } 184 185 /* avoid any address already in use by subflows and 186 * pending join 187 */ 188 if (!lookup_subflow_by_saddr(&msk->conn_list, &entry->addr)) { 189 ret = entry; 190 break; 191 } 192 } 193 rcu_read_unlock(); 194 return ret; 195 } 196 197 static struct mptcp_pm_addr_entry * 198 select_signal_address(struct pm_nl_pernet *pernet, unsigned int pos) 199 { 200 struct mptcp_pm_addr_entry *entry, *ret = NULL; 201 int i = 0; 202 203 rcu_read_lock(); 204 /* do not keep any additional per socket state, just signal 205 * the address list in order. 206 * Note: removal from the local address list during the msk life-cycle 207 * can lead to additional addresses not being announced. 208 */ 209 list_for_each_entry_rcu(entry, &pernet->local_addr_list, list) { 210 if (!(entry->flags & MPTCP_PM_ADDR_FLAG_SIGNAL)) 211 continue; 212 if (i++ == pos) { 213 ret = entry; 214 break; 215 } 216 } 217 rcu_read_unlock(); 218 return ret; 219 } 220 221 unsigned int mptcp_pm_get_add_addr_signal_max(struct mptcp_sock *msk) 222 { 223 struct pm_nl_pernet *pernet; 224 225 pernet = net_generic(sock_net((struct sock *)msk), pm_nl_pernet_id); 226 return READ_ONCE(pernet->add_addr_signal_max); 227 } 228 EXPORT_SYMBOL_GPL(mptcp_pm_get_add_addr_signal_max); 229 230 unsigned int mptcp_pm_get_add_addr_accept_max(struct mptcp_sock *msk) 231 { 232 struct pm_nl_pernet *pernet; 233 234 pernet = net_generic(sock_net((struct sock *)msk), pm_nl_pernet_id); 235 return READ_ONCE(pernet->add_addr_accept_max); 236 } 237 EXPORT_SYMBOL_GPL(mptcp_pm_get_add_addr_accept_max); 238 239 unsigned int mptcp_pm_get_subflows_max(struct mptcp_sock *msk) 240 { 241 struct pm_nl_pernet *pernet; 242 243 pernet = net_generic(sock_net((struct sock *)msk), pm_nl_pernet_id); 244 return READ_ONCE(pernet->subflows_max); 245 } 246 EXPORT_SYMBOL_GPL(mptcp_pm_get_subflows_max); 247 248 unsigned int mptcp_pm_get_local_addr_max(struct mptcp_sock *msk) 249 { 250 struct pm_nl_pernet *pernet; 251 252 pernet = net_generic(sock_net((struct sock *)msk), pm_nl_pernet_id); 253 return READ_ONCE(pernet->local_addr_max); 254 } 255 EXPORT_SYMBOL_GPL(mptcp_pm_get_local_addr_max); 256 257 static void check_work_pending(struct mptcp_sock *msk) 258 { 259 if (msk->pm.add_addr_signaled == mptcp_pm_get_add_addr_signal_max(msk) && 260 (msk->pm.local_addr_used == mptcp_pm_get_local_addr_max(msk) || 261 msk->pm.subflows == mptcp_pm_get_subflows_max(msk))) 262 WRITE_ONCE(msk->pm.work_pending, false); 263 } 264 265 struct mptcp_pm_add_entry * 266 mptcp_lookup_anno_list_by_saddr(struct mptcp_sock *msk, 267 struct mptcp_addr_info *addr) 268 { 269 struct mptcp_pm_add_entry *entry; 270 271 lockdep_assert_held(&msk->pm.lock); 272 273 list_for_each_entry(entry, &msk->pm.anno_list, list) { 274 if (addresses_equal(&entry->addr, addr, true)) 275 return entry; 276 } 277 278 return NULL; 279 } 280 281 bool mptcp_pm_sport_in_anno_list(struct mptcp_sock *msk, const struct sock *sk) 282 { 283 struct mptcp_pm_add_entry *entry; 284 struct mptcp_addr_info saddr; 285 bool ret = false; 286 287 local_address((struct sock_common *)sk, &saddr); 288 289 spin_lock_bh(&msk->pm.lock); 290 list_for_each_entry(entry, &msk->pm.anno_list, list) { 291 if (addresses_equal(&entry->addr, &saddr, true)) { 292 ret = true; 293 goto out; 294 } 295 } 296 297 out: 298 spin_unlock_bh(&msk->pm.lock); 299 return ret; 300 } 301 302 static void mptcp_pm_add_timer(struct timer_list *timer) 303 { 304 struct mptcp_pm_add_entry *entry = from_timer(entry, timer, add_timer); 305 struct mptcp_sock *msk = entry->sock; 306 struct sock *sk = (struct sock *)msk; 307 308 pr_debug("msk=%p", msk); 309 310 if (!msk) 311 return; 312 313 if (inet_sk_state_load(sk) == TCP_CLOSE) 314 return; 315 316 if (!entry->addr.id) 317 return; 318 319 if (mptcp_pm_should_add_signal(msk)) { 320 sk_reset_timer(sk, timer, jiffies + TCP_RTO_MAX / 8); 321 goto out; 322 } 323 324 spin_lock_bh(&msk->pm.lock); 325 326 if (!mptcp_pm_should_add_signal(msk)) { 327 pr_debug("retransmit ADD_ADDR id=%d", entry->addr.id); 328 mptcp_pm_announce_addr(msk, &entry->addr, false); 329 mptcp_pm_add_addr_send_ack(msk); 330 entry->retrans_times++; 331 } 332 333 if (entry->retrans_times < ADD_ADDR_RETRANS_MAX) 334 sk_reset_timer(sk, timer, 335 jiffies + mptcp_get_add_addr_timeout(sock_net(sk))); 336 337 spin_unlock_bh(&msk->pm.lock); 338 339 if (entry->retrans_times == ADD_ADDR_RETRANS_MAX) 340 mptcp_pm_subflow_established(msk); 341 342 out: 343 __sock_put(sk); 344 } 345 346 struct mptcp_pm_add_entry * 347 mptcp_pm_del_add_timer(struct mptcp_sock *msk, 348 struct mptcp_addr_info *addr, bool check_id) 349 { 350 struct mptcp_pm_add_entry *entry; 351 struct sock *sk = (struct sock *)msk; 352 353 spin_lock_bh(&msk->pm.lock); 354 entry = mptcp_lookup_anno_list_by_saddr(msk, addr); 355 if (entry && (!check_id || entry->addr.id == addr->id)) 356 entry->retrans_times = ADD_ADDR_RETRANS_MAX; 357 spin_unlock_bh(&msk->pm.lock); 358 359 if (entry && (!check_id || entry->addr.id == addr->id)) 360 sk_stop_timer_sync(sk, &entry->add_timer); 361 362 return entry; 363 } 364 365 static bool mptcp_pm_alloc_anno_list(struct mptcp_sock *msk, 366 struct mptcp_pm_addr_entry *entry) 367 { 368 struct mptcp_pm_add_entry *add_entry = NULL; 369 struct sock *sk = (struct sock *)msk; 370 struct net *net = sock_net(sk); 371 372 lockdep_assert_held(&msk->pm.lock); 373 374 if (mptcp_lookup_anno_list_by_saddr(msk, &entry->addr)) 375 return false; 376 377 add_entry = kmalloc(sizeof(*add_entry), GFP_ATOMIC); 378 if (!add_entry) 379 return false; 380 381 list_add(&add_entry->list, &msk->pm.anno_list); 382 383 add_entry->addr = entry->addr; 384 add_entry->sock = msk; 385 add_entry->retrans_times = 0; 386 387 timer_setup(&add_entry->add_timer, mptcp_pm_add_timer, 0); 388 sk_reset_timer(sk, &add_entry->add_timer, 389 jiffies + mptcp_get_add_addr_timeout(net)); 390 391 return true; 392 } 393 394 void mptcp_pm_free_anno_list(struct mptcp_sock *msk) 395 { 396 struct mptcp_pm_add_entry *entry, *tmp; 397 struct sock *sk = (struct sock *)msk; 398 LIST_HEAD(free_list); 399 400 pr_debug("msk=%p", msk); 401 402 spin_lock_bh(&msk->pm.lock); 403 list_splice_init(&msk->pm.anno_list, &free_list); 404 spin_unlock_bh(&msk->pm.lock); 405 406 list_for_each_entry_safe(entry, tmp, &free_list, list) { 407 sk_stop_timer_sync(sk, &entry->add_timer); 408 kfree(entry); 409 } 410 } 411 412 static void mptcp_pm_create_subflow_or_signal_addr(struct mptcp_sock *msk) 413 { 414 struct sock *sk = (struct sock *)msk; 415 struct mptcp_pm_addr_entry *local; 416 unsigned int add_addr_signal_max; 417 unsigned int local_addr_max; 418 struct pm_nl_pernet *pernet; 419 unsigned int subflows_max; 420 421 pernet = net_generic(sock_net(sk), pm_nl_pernet_id); 422 423 add_addr_signal_max = mptcp_pm_get_add_addr_signal_max(msk); 424 local_addr_max = mptcp_pm_get_local_addr_max(msk); 425 subflows_max = mptcp_pm_get_subflows_max(msk); 426 427 pr_debug("local %d:%d signal %d:%d subflows %d:%d\n", 428 msk->pm.local_addr_used, local_addr_max, 429 msk->pm.add_addr_signaled, add_addr_signal_max, 430 msk->pm.subflows, subflows_max); 431 432 /* check first for announce */ 433 if (msk->pm.add_addr_signaled < add_addr_signal_max) { 434 local = select_signal_address(pernet, 435 msk->pm.add_addr_signaled); 436 437 if (local) { 438 if (mptcp_pm_alloc_anno_list(msk, local)) { 439 msk->pm.add_addr_signaled++; 440 mptcp_pm_announce_addr(msk, &local->addr, false); 441 mptcp_pm_nl_addr_send_ack(msk); 442 } 443 } else { 444 /* pick failed, avoid fourther attempts later */ 445 msk->pm.local_addr_used = add_addr_signal_max; 446 } 447 448 check_work_pending(msk); 449 } 450 451 /* check if should create a new subflow */ 452 if (msk->pm.local_addr_used < local_addr_max && 453 msk->pm.subflows < subflows_max && 454 !READ_ONCE(msk->pm.remote_deny_join_id0)) { 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 bool slow; 544 545 spin_unlock_bh(&msk->pm.lock); 546 pr_debug("send ack for %s%s%s", 547 mptcp_pm_should_add_signal(msk) ? "add_addr" : "rm_addr", 548 mptcp_pm_should_add_signal_ipv6(msk) ? " [ipv6]" : "", 549 mptcp_pm_should_add_signal_port(msk) ? " [port]" : ""); 550 551 slow = lock_sock_fast(ssk); 552 tcp_send_ack(ssk); 553 unlock_sock_fast(ssk, slow); 554 spin_lock_bh(&msk->pm.lock); 555 } 556 } 557 558 int mptcp_pm_nl_mp_prio_send_ack(struct mptcp_sock *msk, 559 struct mptcp_addr_info *addr, 560 u8 bkup) 561 { 562 struct mptcp_subflow_context *subflow; 563 564 pr_debug("bkup=%d", bkup); 565 566 mptcp_for_each_subflow(msk, subflow) { 567 struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 568 struct sock *sk = (struct sock *)msk; 569 struct mptcp_addr_info local; 570 bool slow; 571 572 local_address((struct sock_common *)ssk, &local); 573 if (!addresses_equal(&local, addr, addr->port)) 574 continue; 575 576 subflow->backup = bkup; 577 subflow->send_mp_prio = 1; 578 subflow->request_bkup = bkup; 579 __MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_MPPRIOTX); 580 581 spin_unlock_bh(&msk->pm.lock); 582 pr_debug("send ack for mp_prio"); 583 slow = lock_sock_fast(ssk); 584 tcp_send_ack(ssk); 585 unlock_sock_fast(ssk, slow); 586 spin_lock_bh(&msk->pm.lock); 587 588 return 0; 589 } 590 591 return -EINVAL; 592 } 593 594 static void mptcp_pm_nl_rm_addr_or_subflow(struct mptcp_sock *msk, 595 const struct mptcp_rm_list *rm_list, 596 enum linux_mptcp_mib_field rm_type) 597 { 598 struct mptcp_subflow_context *subflow, *tmp; 599 struct sock *sk = (struct sock *)msk; 600 u8 i; 601 602 pr_debug("%s rm_list_nr %d", 603 rm_type == MPTCP_MIB_RMADDR ? "address" : "subflow", rm_list->nr); 604 605 msk_owned_by_me(msk); 606 607 if (!rm_list->nr) 608 return; 609 610 if (list_empty(&msk->conn_list)) 611 return; 612 613 for (i = 0; i < rm_list->nr; i++) { 614 list_for_each_entry_safe(subflow, tmp, &msk->conn_list, node) { 615 struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 616 int how = RCV_SHUTDOWN | SEND_SHUTDOWN; 617 u8 id = subflow->local_id; 618 619 if (rm_type == MPTCP_MIB_RMADDR) 620 id = subflow->remote_id; 621 622 if (rm_list->ids[i] != id) 623 continue; 624 625 pr_debug(" -> %s rm_list_ids[%d]=%u local_id=%u remote_id=%u", 626 rm_type == MPTCP_MIB_RMADDR ? "address" : "subflow", 627 i, rm_list->ids[i], subflow->local_id, subflow->remote_id); 628 spin_unlock_bh(&msk->pm.lock); 629 mptcp_subflow_shutdown(sk, ssk, how); 630 mptcp_close_ssk(sk, ssk, subflow); 631 spin_lock_bh(&msk->pm.lock); 632 633 if (rm_type == MPTCP_MIB_RMADDR) { 634 msk->pm.add_addr_accepted--; 635 WRITE_ONCE(msk->pm.accept_addr, true); 636 } else if (rm_type == MPTCP_MIB_RMSUBFLOW) { 637 msk->pm.local_addr_used--; 638 } 639 msk->pm.subflows--; 640 __MPTCP_INC_STATS(sock_net(sk), rm_type); 641 } 642 } 643 } 644 645 static void mptcp_pm_nl_rm_addr_received(struct mptcp_sock *msk) 646 { 647 mptcp_pm_nl_rm_addr_or_subflow(msk, &msk->pm.rm_list_rx, MPTCP_MIB_RMADDR); 648 } 649 650 void mptcp_pm_nl_rm_subflow_received(struct mptcp_sock *msk, 651 const struct mptcp_rm_list *rm_list) 652 { 653 mptcp_pm_nl_rm_addr_or_subflow(msk, rm_list, MPTCP_MIB_RMSUBFLOW); 654 } 655 656 void mptcp_pm_nl_work(struct mptcp_sock *msk) 657 { 658 struct mptcp_pm_data *pm = &msk->pm; 659 660 msk_owned_by_me(msk); 661 662 spin_lock_bh(&msk->pm.lock); 663 664 pr_debug("msk=%p status=%x", msk, pm->status); 665 if (pm->status & BIT(MPTCP_PM_ADD_ADDR_RECEIVED)) { 666 pm->status &= ~BIT(MPTCP_PM_ADD_ADDR_RECEIVED); 667 mptcp_pm_nl_add_addr_received(msk); 668 } 669 if (pm->status & BIT(MPTCP_PM_ADD_ADDR_SEND_ACK)) { 670 pm->status &= ~BIT(MPTCP_PM_ADD_ADDR_SEND_ACK); 671 mptcp_pm_nl_addr_send_ack(msk); 672 } 673 if (pm->status & BIT(MPTCP_PM_RM_ADDR_RECEIVED)) { 674 pm->status &= ~BIT(MPTCP_PM_RM_ADDR_RECEIVED); 675 mptcp_pm_nl_rm_addr_received(msk); 676 } 677 if (pm->status & BIT(MPTCP_PM_ESTABLISHED)) { 678 pm->status &= ~BIT(MPTCP_PM_ESTABLISHED); 679 mptcp_pm_nl_fully_established(msk); 680 } 681 if (pm->status & BIT(MPTCP_PM_SUBFLOW_ESTABLISHED)) { 682 pm->status &= ~BIT(MPTCP_PM_SUBFLOW_ESTABLISHED); 683 mptcp_pm_nl_subflow_established(msk); 684 } 685 686 spin_unlock_bh(&msk->pm.lock); 687 } 688 689 static bool address_use_port(struct mptcp_pm_addr_entry *entry) 690 { 691 return (entry->flags & 692 (MPTCP_PM_ADDR_FLAG_SIGNAL | MPTCP_PM_ADDR_FLAG_SUBFLOW)) == 693 MPTCP_PM_ADDR_FLAG_SIGNAL; 694 } 695 696 static int mptcp_pm_nl_append_new_local_addr(struct pm_nl_pernet *pernet, 697 struct mptcp_pm_addr_entry *entry) 698 { 699 struct mptcp_pm_addr_entry *cur; 700 unsigned int addr_max; 701 int ret = -EINVAL; 702 703 spin_lock_bh(&pernet->lock); 704 /* to keep the code simple, don't do IDR-like allocation for address ID, 705 * just bail when we exceed limits 706 */ 707 if (pernet->next_id == MAX_ADDR_ID) 708 pernet->next_id = 1; 709 if (pernet->addrs >= MPTCP_PM_ADDR_MAX) 710 goto out; 711 if (test_bit(entry->addr.id, pernet->id_bitmap)) 712 goto out; 713 714 /* do not insert duplicate address, differentiate on port only 715 * singled addresses 716 */ 717 list_for_each_entry(cur, &pernet->local_addr_list, list) { 718 if (addresses_equal(&cur->addr, &entry->addr, 719 address_use_port(entry) && 720 address_use_port(cur))) 721 goto out; 722 } 723 724 if (!entry->addr.id) { 725 find_next: 726 entry->addr.id = find_next_zero_bit(pernet->id_bitmap, 727 MAX_ADDR_ID + 1, 728 pernet->next_id); 729 if ((!entry->addr.id || entry->addr.id > MAX_ADDR_ID) && 730 pernet->next_id != 1) { 731 pernet->next_id = 1; 732 goto find_next; 733 } 734 } 735 736 if (!entry->addr.id || entry->addr.id > MAX_ADDR_ID) 737 goto out; 738 739 __set_bit(entry->addr.id, pernet->id_bitmap); 740 if (entry->addr.id > pernet->next_id) 741 pernet->next_id = entry->addr.id; 742 743 if (entry->flags & MPTCP_PM_ADDR_FLAG_SIGNAL) { 744 addr_max = pernet->add_addr_signal_max; 745 WRITE_ONCE(pernet->add_addr_signal_max, addr_max + 1); 746 } 747 if (entry->flags & MPTCP_PM_ADDR_FLAG_SUBFLOW) { 748 addr_max = pernet->local_addr_max; 749 WRITE_ONCE(pernet->local_addr_max, addr_max + 1); 750 } 751 752 pernet->addrs++; 753 list_add_tail_rcu(&entry->list, &pernet->local_addr_list); 754 ret = entry->addr.id; 755 756 out: 757 spin_unlock_bh(&pernet->lock); 758 return ret; 759 } 760 761 static int mptcp_pm_nl_create_listen_socket(struct sock *sk, 762 struct mptcp_pm_addr_entry *entry) 763 { 764 struct sockaddr_storage addr; 765 struct mptcp_sock *msk; 766 struct socket *ssock; 767 int backlog = 1024; 768 int err; 769 770 err = sock_create_kern(sock_net(sk), entry->addr.family, 771 SOCK_STREAM, IPPROTO_MPTCP, &entry->lsk); 772 if (err) 773 return err; 774 775 msk = mptcp_sk(entry->lsk->sk); 776 if (!msk) { 777 err = -EINVAL; 778 goto out; 779 } 780 781 ssock = __mptcp_nmpc_socket(msk); 782 if (!ssock) { 783 err = -EINVAL; 784 goto out; 785 } 786 787 mptcp_info2sockaddr(&entry->addr, &addr, entry->addr.family); 788 err = kernel_bind(ssock, (struct sockaddr *)&addr, 789 sizeof(struct sockaddr_in)); 790 if (err) { 791 pr_warn("kernel_bind error, err=%d", err); 792 goto out; 793 } 794 795 err = kernel_listen(ssock, backlog); 796 if (err) { 797 pr_warn("kernel_listen error, err=%d", err); 798 goto out; 799 } 800 801 return 0; 802 803 out: 804 sock_release(entry->lsk); 805 return err; 806 } 807 808 int mptcp_pm_nl_get_local_id(struct mptcp_sock *msk, struct sock_common *skc) 809 { 810 struct mptcp_pm_addr_entry *entry; 811 struct mptcp_addr_info skc_local; 812 struct mptcp_addr_info msk_local; 813 struct pm_nl_pernet *pernet; 814 int ret = -1; 815 816 if (WARN_ON_ONCE(!msk)) 817 return -1; 818 819 /* The 0 ID mapping is defined by the first subflow, copied into the msk 820 * addr 821 */ 822 local_address((struct sock_common *)msk, &msk_local); 823 local_address((struct sock_common *)skc, &skc_local); 824 if (addresses_equal(&msk_local, &skc_local, false)) 825 return 0; 826 827 if (address_zero(&skc_local)) 828 return 0; 829 830 pernet = net_generic(sock_net((struct sock *)msk), pm_nl_pernet_id); 831 832 rcu_read_lock(); 833 list_for_each_entry_rcu(entry, &pernet->local_addr_list, list) { 834 if (addresses_equal(&entry->addr, &skc_local, entry->addr.port)) { 835 ret = entry->addr.id; 836 break; 837 } 838 } 839 rcu_read_unlock(); 840 if (ret >= 0) 841 return ret; 842 843 /* address not found, add to local list */ 844 entry = kmalloc(sizeof(*entry), GFP_ATOMIC); 845 if (!entry) 846 return -ENOMEM; 847 848 entry->addr = skc_local; 849 entry->addr.id = 0; 850 entry->addr.port = 0; 851 entry->ifindex = 0; 852 entry->flags = 0; 853 entry->lsk = NULL; 854 ret = mptcp_pm_nl_append_new_local_addr(pernet, entry); 855 if (ret < 0) 856 kfree(entry); 857 858 return ret; 859 } 860 861 void mptcp_pm_nl_data_init(struct mptcp_sock *msk) 862 { 863 struct mptcp_pm_data *pm = &msk->pm; 864 bool subflows; 865 866 subflows = !!mptcp_pm_get_subflows_max(msk); 867 WRITE_ONCE(pm->work_pending, (!!mptcp_pm_get_local_addr_max(msk) && subflows) || 868 !!mptcp_pm_get_add_addr_signal_max(msk)); 869 WRITE_ONCE(pm->accept_addr, !!mptcp_pm_get_add_addr_accept_max(msk) && subflows); 870 WRITE_ONCE(pm->accept_subflow, subflows); 871 } 872 873 #define MPTCP_PM_CMD_GRP_OFFSET 0 874 #define MPTCP_PM_EV_GRP_OFFSET 1 875 876 static const struct genl_multicast_group mptcp_pm_mcgrps[] = { 877 [MPTCP_PM_CMD_GRP_OFFSET] = { .name = MPTCP_PM_CMD_GRP_NAME, }, 878 [MPTCP_PM_EV_GRP_OFFSET] = { .name = MPTCP_PM_EV_GRP_NAME, 879 .flags = GENL_UNS_ADMIN_PERM, 880 }, 881 }; 882 883 static const struct nla_policy 884 mptcp_pm_addr_policy[MPTCP_PM_ADDR_ATTR_MAX + 1] = { 885 [MPTCP_PM_ADDR_ATTR_FAMILY] = { .type = NLA_U16, }, 886 [MPTCP_PM_ADDR_ATTR_ID] = { .type = NLA_U8, }, 887 [MPTCP_PM_ADDR_ATTR_ADDR4] = { .type = NLA_U32, }, 888 [MPTCP_PM_ADDR_ATTR_ADDR6] = 889 NLA_POLICY_EXACT_LEN(sizeof(struct in6_addr)), 890 [MPTCP_PM_ADDR_ATTR_PORT] = { .type = NLA_U16 }, 891 [MPTCP_PM_ADDR_ATTR_FLAGS] = { .type = NLA_U32 }, 892 [MPTCP_PM_ADDR_ATTR_IF_IDX] = { .type = NLA_S32 }, 893 }; 894 895 static const struct nla_policy mptcp_pm_policy[MPTCP_PM_ATTR_MAX + 1] = { 896 [MPTCP_PM_ATTR_ADDR] = 897 NLA_POLICY_NESTED(mptcp_pm_addr_policy), 898 [MPTCP_PM_ATTR_RCV_ADD_ADDRS] = { .type = NLA_U32, }, 899 [MPTCP_PM_ATTR_SUBFLOWS] = { .type = NLA_U32, }, 900 }; 901 902 static int mptcp_pm_family_to_addr(int family) 903 { 904 #if IS_ENABLED(CONFIG_MPTCP_IPV6) 905 if (family == AF_INET6) 906 return MPTCP_PM_ADDR_ATTR_ADDR6; 907 #endif 908 return MPTCP_PM_ADDR_ATTR_ADDR4; 909 } 910 911 static int mptcp_pm_parse_addr(struct nlattr *attr, struct genl_info *info, 912 bool require_family, 913 struct mptcp_pm_addr_entry *entry) 914 { 915 struct nlattr *tb[MPTCP_PM_ADDR_ATTR_MAX + 1]; 916 int err, addr_addr; 917 918 if (!attr) { 919 GENL_SET_ERR_MSG(info, "missing address info"); 920 return -EINVAL; 921 } 922 923 /* no validation needed - was already done via nested policy */ 924 err = nla_parse_nested_deprecated(tb, MPTCP_PM_ADDR_ATTR_MAX, attr, 925 mptcp_pm_addr_policy, info->extack); 926 if (err) 927 return err; 928 929 memset(entry, 0, sizeof(*entry)); 930 if (!tb[MPTCP_PM_ADDR_ATTR_FAMILY]) { 931 if (!require_family) 932 goto skip_family; 933 934 NL_SET_ERR_MSG_ATTR(info->extack, attr, 935 "missing family"); 936 return -EINVAL; 937 } 938 939 entry->addr.family = nla_get_u16(tb[MPTCP_PM_ADDR_ATTR_FAMILY]); 940 if (entry->addr.family != AF_INET 941 #if IS_ENABLED(CONFIG_MPTCP_IPV6) 942 && entry->addr.family != AF_INET6 943 #endif 944 ) { 945 NL_SET_ERR_MSG_ATTR(info->extack, attr, 946 "unknown address family"); 947 return -EINVAL; 948 } 949 addr_addr = mptcp_pm_family_to_addr(entry->addr.family); 950 if (!tb[addr_addr]) { 951 NL_SET_ERR_MSG_ATTR(info->extack, attr, 952 "missing address data"); 953 return -EINVAL; 954 } 955 956 #if IS_ENABLED(CONFIG_MPTCP_IPV6) 957 if (entry->addr.family == AF_INET6) 958 entry->addr.addr6 = nla_get_in6_addr(tb[addr_addr]); 959 else 960 #endif 961 entry->addr.addr.s_addr = nla_get_in_addr(tb[addr_addr]); 962 963 skip_family: 964 if (tb[MPTCP_PM_ADDR_ATTR_IF_IDX]) { 965 u32 val = nla_get_s32(tb[MPTCP_PM_ADDR_ATTR_IF_IDX]); 966 967 entry->ifindex = val; 968 } 969 970 if (tb[MPTCP_PM_ADDR_ATTR_ID]) 971 entry->addr.id = nla_get_u8(tb[MPTCP_PM_ADDR_ATTR_ID]); 972 973 if (tb[MPTCP_PM_ADDR_ATTR_FLAGS]) 974 entry->flags = nla_get_u32(tb[MPTCP_PM_ADDR_ATTR_FLAGS]); 975 976 if (tb[MPTCP_PM_ADDR_ATTR_PORT]) { 977 if (!(entry->flags & MPTCP_PM_ADDR_FLAG_SIGNAL)) { 978 NL_SET_ERR_MSG_ATTR(info->extack, attr, 979 "flags must have signal when using port"); 980 return -EINVAL; 981 } 982 entry->addr.port = htons(nla_get_u16(tb[MPTCP_PM_ADDR_ATTR_PORT])); 983 } 984 985 return 0; 986 } 987 988 static struct pm_nl_pernet *genl_info_pm_nl(struct genl_info *info) 989 { 990 return net_generic(genl_info_net(info), pm_nl_pernet_id); 991 } 992 993 static int mptcp_nl_add_subflow_or_signal_addr(struct net *net) 994 { 995 struct mptcp_sock *msk; 996 long s_slot = 0, s_num = 0; 997 998 while ((msk = mptcp_token_iter_next(net, &s_slot, &s_num)) != NULL) { 999 struct sock *sk = (struct sock *)msk; 1000 1001 if (!READ_ONCE(msk->fully_established)) 1002 goto next; 1003 1004 lock_sock(sk); 1005 spin_lock_bh(&msk->pm.lock); 1006 mptcp_pm_create_subflow_or_signal_addr(msk); 1007 spin_unlock_bh(&msk->pm.lock); 1008 release_sock(sk); 1009 1010 next: 1011 sock_put(sk); 1012 cond_resched(); 1013 } 1014 1015 return 0; 1016 } 1017 1018 static int mptcp_nl_cmd_add_addr(struct sk_buff *skb, struct genl_info *info) 1019 { 1020 struct nlattr *attr = info->attrs[MPTCP_PM_ATTR_ADDR]; 1021 struct pm_nl_pernet *pernet = genl_info_pm_nl(info); 1022 struct mptcp_pm_addr_entry addr, *entry; 1023 int ret; 1024 1025 ret = mptcp_pm_parse_addr(attr, info, true, &addr); 1026 if (ret < 0) 1027 return ret; 1028 1029 entry = kmalloc(sizeof(*entry), GFP_KERNEL); 1030 if (!entry) { 1031 GENL_SET_ERR_MSG(info, "can't allocate addr"); 1032 return -ENOMEM; 1033 } 1034 1035 *entry = addr; 1036 if (entry->addr.port) { 1037 ret = mptcp_pm_nl_create_listen_socket(skb->sk, entry); 1038 if (ret) { 1039 GENL_SET_ERR_MSG(info, "create listen socket error"); 1040 kfree(entry); 1041 return ret; 1042 } 1043 } 1044 ret = mptcp_pm_nl_append_new_local_addr(pernet, entry); 1045 if (ret < 0) { 1046 GENL_SET_ERR_MSG(info, "too many addresses or duplicate one"); 1047 if (entry->lsk) 1048 sock_release(entry->lsk); 1049 kfree(entry); 1050 return ret; 1051 } 1052 1053 mptcp_nl_add_subflow_or_signal_addr(sock_net(skb->sk)); 1054 1055 return 0; 1056 } 1057 1058 static struct mptcp_pm_addr_entry * 1059 __lookup_addr_by_id(struct pm_nl_pernet *pernet, unsigned int id) 1060 { 1061 struct mptcp_pm_addr_entry *entry; 1062 1063 list_for_each_entry(entry, &pernet->local_addr_list, list) { 1064 if (entry->addr.id == id) 1065 return entry; 1066 } 1067 return NULL; 1068 } 1069 1070 static bool remove_anno_list_by_saddr(struct mptcp_sock *msk, 1071 struct mptcp_addr_info *addr) 1072 { 1073 struct mptcp_pm_add_entry *entry; 1074 1075 entry = mptcp_pm_del_add_timer(msk, addr, false); 1076 if (entry) { 1077 list_del(&entry->list); 1078 kfree(entry); 1079 return true; 1080 } 1081 1082 return false; 1083 } 1084 1085 static bool mptcp_pm_remove_anno_addr(struct mptcp_sock *msk, 1086 struct mptcp_addr_info *addr, 1087 bool force) 1088 { 1089 struct mptcp_rm_list list = { .nr = 0 }; 1090 bool ret; 1091 1092 list.ids[list.nr++] = addr->id; 1093 1094 ret = remove_anno_list_by_saddr(msk, addr); 1095 if (ret || force) { 1096 spin_lock_bh(&msk->pm.lock); 1097 mptcp_pm_remove_addr(msk, &list); 1098 spin_unlock_bh(&msk->pm.lock); 1099 } 1100 return ret; 1101 } 1102 1103 static int mptcp_nl_remove_subflow_and_signal_addr(struct net *net, 1104 struct mptcp_addr_info *addr) 1105 { 1106 struct mptcp_sock *msk; 1107 long s_slot = 0, s_num = 0; 1108 struct mptcp_rm_list list = { .nr = 0 }; 1109 1110 pr_debug("remove_id=%d", addr->id); 1111 1112 list.ids[list.nr++] = addr->id; 1113 1114 while ((msk = mptcp_token_iter_next(net, &s_slot, &s_num)) != NULL) { 1115 struct sock *sk = (struct sock *)msk; 1116 bool remove_subflow; 1117 1118 if (list_empty(&msk->conn_list)) { 1119 mptcp_pm_remove_anno_addr(msk, addr, false); 1120 goto next; 1121 } 1122 1123 lock_sock(sk); 1124 remove_subflow = lookup_subflow_by_saddr(&msk->conn_list, addr); 1125 mptcp_pm_remove_anno_addr(msk, addr, remove_subflow); 1126 if (remove_subflow) 1127 mptcp_pm_remove_subflow(msk, &list); 1128 release_sock(sk); 1129 1130 next: 1131 sock_put(sk); 1132 cond_resched(); 1133 } 1134 1135 return 0; 1136 } 1137 1138 /* caller must ensure the RCU grace period is already elapsed */ 1139 static void __mptcp_pm_release_addr_entry(struct mptcp_pm_addr_entry *entry) 1140 { 1141 if (entry->lsk) 1142 sock_release(entry->lsk); 1143 kfree(entry); 1144 } 1145 1146 static int mptcp_nl_remove_id_zero_address(struct net *net, 1147 struct mptcp_addr_info *addr) 1148 { 1149 struct mptcp_rm_list list = { .nr = 0 }; 1150 long s_slot = 0, s_num = 0; 1151 struct mptcp_sock *msk; 1152 1153 list.ids[list.nr++] = 0; 1154 1155 while ((msk = mptcp_token_iter_next(net, &s_slot, &s_num)) != NULL) { 1156 struct sock *sk = (struct sock *)msk; 1157 struct mptcp_addr_info msk_local; 1158 1159 if (list_empty(&msk->conn_list)) 1160 goto next; 1161 1162 local_address((struct sock_common *)msk, &msk_local); 1163 if (!addresses_equal(&msk_local, addr, addr->port)) 1164 goto next; 1165 1166 lock_sock(sk); 1167 spin_lock_bh(&msk->pm.lock); 1168 mptcp_pm_remove_addr(msk, &list); 1169 mptcp_pm_nl_rm_subflow_received(msk, &list); 1170 spin_unlock_bh(&msk->pm.lock); 1171 release_sock(sk); 1172 1173 next: 1174 sock_put(sk); 1175 cond_resched(); 1176 } 1177 1178 return 0; 1179 } 1180 1181 static int mptcp_nl_cmd_del_addr(struct sk_buff *skb, struct genl_info *info) 1182 { 1183 struct nlattr *attr = info->attrs[MPTCP_PM_ATTR_ADDR]; 1184 struct pm_nl_pernet *pernet = genl_info_pm_nl(info); 1185 struct mptcp_pm_addr_entry addr, *entry; 1186 unsigned int addr_max; 1187 int ret; 1188 1189 ret = mptcp_pm_parse_addr(attr, info, false, &addr); 1190 if (ret < 0) 1191 return ret; 1192 1193 /* the zero id address is special: the first address used by the msk 1194 * always gets such an id, so different subflows can have different zero 1195 * id addresses. Additionally zero id is not accounted for in id_bitmap. 1196 * Let's use an 'mptcp_rm_list' instead of the common remove code. 1197 */ 1198 if (addr.addr.id == 0) 1199 return mptcp_nl_remove_id_zero_address(sock_net(skb->sk), &addr.addr); 1200 1201 spin_lock_bh(&pernet->lock); 1202 entry = __lookup_addr_by_id(pernet, addr.addr.id); 1203 if (!entry) { 1204 GENL_SET_ERR_MSG(info, "address not found"); 1205 spin_unlock_bh(&pernet->lock); 1206 return -EINVAL; 1207 } 1208 if (entry->flags & MPTCP_PM_ADDR_FLAG_SIGNAL) { 1209 addr_max = pernet->add_addr_signal_max; 1210 WRITE_ONCE(pernet->add_addr_signal_max, addr_max - 1); 1211 } 1212 if (entry->flags & MPTCP_PM_ADDR_FLAG_SUBFLOW) { 1213 addr_max = pernet->local_addr_max; 1214 WRITE_ONCE(pernet->local_addr_max, addr_max - 1); 1215 } 1216 1217 pernet->addrs--; 1218 list_del_rcu(&entry->list); 1219 __clear_bit(entry->addr.id, pernet->id_bitmap); 1220 spin_unlock_bh(&pernet->lock); 1221 1222 mptcp_nl_remove_subflow_and_signal_addr(sock_net(skb->sk), &entry->addr); 1223 synchronize_rcu(); 1224 __mptcp_pm_release_addr_entry(entry); 1225 1226 return ret; 1227 } 1228 1229 static void mptcp_pm_remove_addrs_and_subflows(struct mptcp_sock *msk, 1230 struct list_head *rm_list) 1231 { 1232 struct mptcp_rm_list alist = { .nr = 0 }, slist = { .nr = 0 }; 1233 struct mptcp_pm_addr_entry *entry; 1234 1235 list_for_each_entry(entry, rm_list, list) { 1236 if (lookup_subflow_by_saddr(&msk->conn_list, &entry->addr) && 1237 alist.nr < MPTCP_RM_IDS_MAX && 1238 slist.nr < MPTCP_RM_IDS_MAX) { 1239 alist.ids[alist.nr++] = entry->addr.id; 1240 slist.ids[slist.nr++] = entry->addr.id; 1241 } else if (remove_anno_list_by_saddr(msk, &entry->addr) && 1242 alist.nr < MPTCP_RM_IDS_MAX) { 1243 alist.ids[alist.nr++] = entry->addr.id; 1244 } 1245 } 1246 1247 if (alist.nr) { 1248 spin_lock_bh(&msk->pm.lock); 1249 mptcp_pm_remove_addr(msk, &alist); 1250 spin_unlock_bh(&msk->pm.lock); 1251 } 1252 if (slist.nr) 1253 mptcp_pm_remove_subflow(msk, &slist); 1254 } 1255 1256 static void mptcp_nl_remove_addrs_list(struct net *net, 1257 struct list_head *rm_list) 1258 { 1259 long s_slot = 0, s_num = 0; 1260 struct mptcp_sock *msk; 1261 1262 if (list_empty(rm_list)) 1263 return; 1264 1265 while ((msk = mptcp_token_iter_next(net, &s_slot, &s_num)) != NULL) { 1266 struct sock *sk = (struct sock *)msk; 1267 1268 lock_sock(sk); 1269 mptcp_pm_remove_addrs_and_subflows(msk, rm_list); 1270 release_sock(sk); 1271 1272 sock_put(sk); 1273 cond_resched(); 1274 } 1275 } 1276 1277 /* caller must ensure the RCU grace period is already elapsed */ 1278 static void __flush_addrs(struct list_head *list) 1279 { 1280 while (!list_empty(list)) { 1281 struct mptcp_pm_addr_entry *cur; 1282 1283 cur = list_entry(list->next, 1284 struct mptcp_pm_addr_entry, list); 1285 list_del_rcu(&cur->list); 1286 __mptcp_pm_release_addr_entry(cur); 1287 } 1288 } 1289 1290 static void __reset_counters(struct pm_nl_pernet *pernet) 1291 { 1292 WRITE_ONCE(pernet->add_addr_signal_max, 0); 1293 WRITE_ONCE(pernet->add_addr_accept_max, 0); 1294 WRITE_ONCE(pernet->local_addr_max, 0); 1295 pernet->addrs = 0; 1296 } 1297 1298 static int mptcp_nl_cmd_flush_addrs(struct sk_buff *skb, struct genl_info *info) 1299 { 1300 struct pm_nl_pernet *pernet = genl_info_pm_nl(info); 1301 LIST_HEAD(free_list); 1302 1303 spin_lock_bh(&pernet->lock); 1304 list_splice_init(&pernet->local_addr_list, &free_list); 1305 __reset_counters(pernet); 1306 pernet->next_id = 1; 1307 bitmap_zero(pernet->id_bitmap, MAX_ADDR_ID + 1); 1308 spin_unlock_bh(&pernet->lock); 1309 mptcp_nl_remove_addrs_list(sock_net(skb->sk), &free_list); 1310 synchronize_rcu(); 1311 __flush_addrs(&free_list); 1312 return 0; 1313 } 1314 1315 static int mptcp_nl_fill_addr(struct sk_buff *skb, 1316 struct mptcp_pm_addr_entry *entry) 1317 { 1318 struct mptcp_addr_info *addr = &entry->addr; 1319 struct nlattr *attr; 1320 1321 attr = nla_nest_start(skb, MPTCP_PM_ATTR_ADDR); 1322 if (!attr) 1323 return -EMSGSIZE; 1324 1325 if (nla_put_u16(skb, MPTCP_PM_ADDR_ATTR_FAMILY, addr->family)) 1326 goto nla_put_failure; 1327 if (nla_put_u16(skb, MPTCP_PM_ADDR_ATTR_PORT, ntohs(addr->port))) 1328 goto nla_put_failure; 1329 if (nla_put_u8(skb, MPTCP_PM_ADDR_ATTR_ID, addr->id)) 1330 goto nla_put_failure; 1331 if (nla_put_u32(skb, MPTCP_PM_ADDR_ATTR_FLAGS, entry->flags)) 1332 goto nla_put_failure; 1333 if (entry->ifindex && 1334 nla_put_s32(skb, MPTCP_PM_ADDR_ATTR_IF_IDX, entry->ifindex)) 1335 goto nla_put_failure; 1336 1337 if (addr->family == AF_INET && 1338 nla_put_in_addr(skb, MPTCP_PM_ADDR_ATTR_ADDR4, 1339 addr->addr.s_addr)) 1340 goto nla_put_failure; 1341 #if IS_ENABLED(CONFIG_MPTCP_IPV6) 1342 else if (addr->family == AF_INET6 && 1343 nla_put_in6_addr(skb, MPTCP_PM_ADDR_ATTR_ADDR6, &addr->addr6)) 1344 goto nla_put_failure; 1345 #endif 1346 nla_nest_end(skb, attr); 1347 return 0; 1348 1349 nla_put_failure: 1350 nla_nest_cancel(skb, attr); 1351 return -EMSGSIZE; 1352 } 1353 1354 static int mptcp_nl_cmd_get_addr(struct sk_buff *skb, struct genl_info *info) 1355 { 1356 struct nlattr *attr = info->attrs[MPTCP_PM_ATTR_ADDR]; 1357 struct pm_nl_pernet *pernet = genl_info_pm_nl(info); 1358 struct mptcp_pm_addr_entry addr, *entry; 1359 struct sk_buff *msg; 1360 void *reply; 1361 int ret; 1362 1363 ret = mptcp_pm_parse_addr(attr, info, false, &addr); 1364 if (ret < 0) 1365 return ret; 1366 1367 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1368 if (!msg) 1369 return -ENOMEM; 1370 1371 reply = genlmsg_put_reply(msg, info, &mptcp_genl_family, 0, 1372 info->genlhdr->cmd); 1373 if (!reply) { 1374 GENL_SET_ERR_MSG(info, "not enough space in Netlink message"); 1375 ret = -EMSGSIZE; 1376 goto fail; 1377 } 1378 1379 spin_lock_bh(&pernet->lock); 1380 entry = __lookup_addr_by_id(pernet, addr.addr.id); 1381 if (!entry) { 1382 GENL_SET_ERR_MSG(info, "address not found"); 1383 ret = -EINVAL; 1384 goto unlock_fail; 1385 } 1386 1387 ret = mptcp_nl_fill_addr(msg, entry); 1388 if (ret) 1389 goto unlock_fail; 1390 1391 genlmsg_end(msg, reply); 1392 ret = genlmsg_reply(msg, info); 1393 spin_unlock_bh(&pernet->lock); 1394 return ret; 1395 1396 unlock_fail: 1397 spin_unlock_bh(&pernet->lock); 1398 1399 fail: 1400 nlmsg_free(msg); 1401 return ret; 1402 } 1403 1404 static int mptcp_nl_cmd_dump_addrs(struct sk_buff *msg, 1405 struct netlink_callback *cb) 1406 { 1407 struct net *net = sock_net(msg->sk); 1408 struct mptcp_pm_addr_entry *entry; 1409 struct pm_nl_pernet *pernet; 1410 int id = cb->args[0]; 1411 void *hdr; 1412 int i; 1413 1414 pernet = net_generic(net, pm_nl_pernet_id); 1415 1416 spin_lock_bh(&pernet->lock); 1417 for (i = id; i < MAX_ADDR_ID + 1; i++) { 1418 if (test_bit(i, pernet->id_bitmap)) { 1419 entry = __lookup_addr_by_id(pernet, i); 1420 if (!entry) 1421 break; 1422 1423 if (entry->addr.id <= id) 1424 continue; 1425 1426 hdr = genlmsg_put(msg, NETLINK_CB(cb->skb).portid, 1427 cb->nlh->nlmsg_seq, &mptcp_genl_family, 1428 NLM_F_MULTI, MPTCP_PM_CMD_GET_ADDR); 1429 if (!hdr) 1430 break; 1431 1432 if (mptcp_nl_fill_addr(msg, entry) < 0) { 1433 genlmsg_cancel(msg, hdr); 1434 break; 1435 } 1436 1437 id = entry->addr.id; 1438 genlmsg_end(msg, hdr); 1439 } 1440 } 1441 spin_unlock_bh(&pernet->lock); 1442 1443 cb->args[0] = id; 1444 return msg->len; 1445 } 1446 1447 static int parse_limit(struct genl_info *info, int id, unsigned int *limit) 1448 { 1449 struct nlattr *attr = info->attrs[id]; 1450 1451 if (!attr) 1452 return 0; 1453 1454 *limit = nla_get_u32(attr); 1455 if (*limit > MPTCP_PM_ADDR_MAX) { 1456 GENL_SET_ERR_MSG(info, "limit greater than maximum"); 1457 return -EINVAL; 1458 } 1459 return 0; 1460 } 1461 1462 static int 1463 mptcp_nl_cmd_set_limits(struct sk_buff *skb, struct genl_info *info) 1464 { 1465 struct pm_nl_pernet *pernet = genl_info_pm_nl(info); 1466 unsigned int rcv_addrs, subflows; 1467 int ret; 1468 1469 spin_lock_bh(&pernet->lock); 1470 rcv_addrs = pernet->add_addr_accept_max; 1471 ret = parse_limit(info, MPTCP_PM_ATTR_RCV_ADD_ADDRS, &rcv_addrs); 1472 if (ret) 1473 goto unlock; 1474 1475 subflows = pernet->subflows_max; 1476 ret = parse_limit(info, MPTCP_PM_ATTR_SUBFLOWS, &subflows); 1477 if (ret) 1478 goto unlock; 1479 1480 WRITE_ONCE(pernet->add_addr_accept_max, rcv_addrs); 1481 WRITE_ONCE(pernet->subflows_max, subflows); 1482 1483 unlock: 1484 spin_unlock_bh(&pernet->lock); 1485 return ret; 1486 } 1487 1488 static int 1489 mptcp_nl_cmd_get_limits(struct sk_buff *skb, struct genl_info *info) 1490 { 1491 struct pm_nl_pernet *pernet = genl_info_pm_nl(info); 1492 struct sk_buff *msg; 1493 void *reply; 1494 1495 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1496 if (!msg) 1497 return -ENOMEM; 1498 1499 reply = genlmsg_put_reply(msg, info, &mptcp_genl_family, 0, 1500 MPTCP_PM_CMD_GET_LIMITS); 1501 if (!reply) 1502 goto fail; 1503 1504 if (nla_put_u32(msg, MPTCP_PM_ATTR_RCV_ADD_ADDRS, 1505 READ_ONCE(pernet->add_addr_accept_max))) 1506 goto fail; 1507 1508 if (nla_put_u32(msg, MPTCP_PM_ATTR_SUBFLOWS, 1509 READ_ONCE(pernet->subflows_max))) 1510 goto fail; 1511 1512 genlmsg_end(msg, reply); 1513 return genlmsg_reply(msg, info); 1514 1515 fail: 1516 GENL_SET_ERR_MSG(info, "not enough space in Netlink message"); 1517 nlmsg_free(msg); 1518 return -EMSGSIZE; 1519 } 1520 1521 static int mptcp_nl_addr_backup(struct net *net, 1522 struct mptcp_addr_info *addr, 1523 u8 bkup) 1524 { 1525 long s_slot = 0, s_num = 0; 1526 struct mptcp_sock *msk; 1527 int ret = -EINVAL; 1528 1529 while ((msk = mptcp_token_iter_next(net, &s_slot, &s_num)) != NULL) { 1530 struct sock *sk = (struct sock *)msk; 1531 1532 if (list_empty(&msk->conn_list)) 1533 goto next; 1534 1535 lock_sock(sk); 1536 spin_lock_bh(&msk->pm.lock); 1537 ret = mptcp_pm_nl_mp_prio_send_ack(msk, addr, bkup); 1538 spin_unlock_bh(&msk->pm.lock); 1539 release_sock(sk); 1540 1541 next: 1542 sock_put(sk); 1543 cond_resched(); 1544 } 1545 1546 return ret; 1547 } 1548 1549 static int mptcp_nl_cmd_set_flags(struct sk_buff *skb, struct genl_info *info) 1550 { 1551 struct nlattr *attr = info->attrs[MPTCP_PM_ATTR_ADDR]; 1552 struct pm_nl_pernet *pernet = genl_info_pm_nl(info); 1553 struct mptcp_pm_addr_entry addr, *entry; 1554 struct net *net = sock_net(skb->sk); 1555 u8 bkup = 0; 1556 int ret; 1557 1558 ret = mptcp_pm_parse_addr(attr, info, true, &addr); 1559 if (ret < 0) 1560 return ret; 1561 1562 if (addr.flags & MPTCP_PM_ADDR_FLAG_BACKUP) 1563 bkup = 1; 1564 1565 list_for_each_entry(entry, &pernet->local_addr_list, list) { 1566 if (addresses_equal(&entry->addr, &addr.addr, true)) { 1567 ret = mptcp_nl_addr_backup(net, &entry->addr, bkup); 1568 if (ret) 1569 return ret; 1570 1571 if (bkup) 1572 entry->flags |= MPTCP_PM_ADDR_FLAG_BACKUP; 1573 else 1574 entry->flags &= ~MPTCP_PM_ADDR_FLAG_BACKUP; 1575 } 1576 } 1577 1578 return 0; 1579 } 1580 1581 static void mptcp_nl_mcast_send(struct net *net, struct sk_buff *nlskb, gfp_t gfp) 1582 { 1583 genlmsg_multicast_netns(&mptcp_genl_family, net, 1584 nlskb, 0, MPTCP_PM_EV_GRP_OFFSET, gfp); 1585 } 1586 1587 static int mptcp_event_add_subflow(struct sk_buff *skb, const struct sock *ssk) 1588 { 1589 const struct inet_sock *issk = inet_sk(ssk); 1590 const struct mptcp_subflow_context *sf; 1591 1592 if (nla_put_u16(skb, MPTCP_ATTR_FAMILY, ssk->sk_family)) 1593 return -EMSGSIZE; 1594 1595 switch (ssk->sk_family) { 1596 case AF_INET: 1597 if (nla_put_in_addr(skb, MPTCP_ATTR_SADDR4, issk->inet_saddr)) 1598 return -EMSGSIZE; 1599 if (nla_put_in_addr(skb, MPTCP_ATTR_DADDR4, issk->inet_daddr)) 1600 return -EMSGSIZE; 1601 break; 1602 #if IS_ENABLED(CONFIG_MPTCP_IPV6) 1603 case AF_INET6: { 1604 const struct ipv6_pinfo *np = inet6_sk(ssk); 1605 1606 if (nla_put_in6_addr(skb, MPTCP_ATTR_SADDR6, &np->saddr)) 1607 return -EMSGSIZE; 1608 if (nla_put_in6_addr(skb, MPTCP_ATTR_DADDR6, &ssk->sk_v6_daddr)) 1609 return -EMSGSIZE; 1610 break; 1611 } 1612 #endif 1613 default: 1614 WARN_ON_ONCE(1); 1615 return -EMSGSIZE; 1616 } 1617 1618 if (nla_put_be16(skb, MPTCP_ATTR_SPORT, issk->inet_sport)) 1619 return -EMSGSIZE; 1620 if (nla_put_be16(skb, MPTCP_ATTR_DPORT, issk->inet_dport)) 1621 return -EMSGSIZE; 1622 1623 sf = mptcp_subflow_ctx(ssk); 1624 if (WARN_ON_ONCE(!sf)) 1625 return -EINVAL; 1626 1627 if (nla_put_u8(skb, MPTCP_ATTR_LOC_ID, sf->local_id)) 1628 return -EMSGSIZE; 1629 1630 if (nla_put_u8(skb, MPTCP_ATTR_REM_ID, sf->remote_id)) 1631 return -EMSGSIZE; 1632 1633 return 0; 1634 } 1635 1636 static int mptcp_event_put_token_and_ssk(struct sk_buff *skb, 1637 const struct mptcp_sock *msk, 1638 const struct sock *ssk) 1639 { 1640 const struct sock *sk = (const struct sock *)msk; 1641 const struct mptcp_subflow_context *sf; 1642 u8 sk_err; 1643 1644 if (nla_put_u32(skb, MPTCP_ATTR_TOKEN, msk->token)) 1645 return -EMSGSIZE; 1646 1647 if (mptcp_event_add_subflow(skb, ssk)) 1648 return -EMSGSIZE; 1649 1650 sf = mptcp_subflow_ctx(ssk); 1651 if (WARN_ON_ONCE(!sf)) 1652 return -EINVAL; 1653 1654 if (nla_put_u8(skb, MPTCP_ATTR_BACKUP, sf->backup)) 1655 return -EMSGSIZE; 1656 1657 if (ssk->sk_bound_dev_if && 1658 nla_put_s32(skb, MPTCP_ATTR_IF_IDX, ssk->sk_bound_dev_if)) 1659 return -EMSGSIZE; 1660 1661 sk_err = ssk->sk_err; 1662 if (sk_err && sk->sk_state == TCP_ESTABLISHED && 1663 nla_put_u8(skb, MPTCP_ATTR_ERROR, sk_err)) 1664 return -EMSGSIZE; 1665 1666 return 0; 1667 } 1668 1669 static int mptcp_event_sub_established(struct sk_buff *skb, 1670 const struct mptcp_sock *msk, 1671 const struct sock *ssk) 1672 { 1673 return mptcp_event_put_token_and_ssk(skb, msk, ssk); 1674 } 1675 1676 static int mptcp_event_sub_closed(struct sk_buff *skb, 1677 const struct mptcp_sock *msk, 1678 const struct sock *ssk) 1679 { 1680 const struct mptcp_subflow_context *sf; 1681 1682 if (mptcp_event_put_token_and_ssk(skb, msk, ssk)) 1683 return -EMSGSIZE; 1684 1685 sf = mptcp_subflow_ctx(ssk); 1686 if (!sf->reset_seen) 1687 return 0; 1688 1689 if (nla_put_u32(skb, MPTCP_ATTR_RESET_REASON, sf->reset_reason)) 1690 return -EMSGSIZE; 1691 1692 if (nla_put_u32(skb, MPTCP_ATTR_RESET_FLAGS, sf->reset_transient)) 1693 return -EMSGSIZE; 1694 1695 return 0; 1696 } 1697 1698 static int mptcp_event_created(struct sk_buff *skb, 1699 const struct mptcp_sock *msk, 1700 const struct sock *ssk) 1701 { 1702 int err = nla_put_u32(skb, MPTCP_ATTR_TOKEN, msk->token); 1703 1704 if (err) 1705 return err; 1706 1707 return mptcp_event_add_subflow(skb, ssk); 1708 } 1709 1710 void mptcp_event_addr_removed(const struct mptcp_sock *msk, uint8_t id) 1711 { 1712 struct net *net = sock_net((const struct sock *)msk); 1713 struct nlmsghdr *nlh; 1714 struct sk_buff *skb; 1715 1716 if (!genl_has_listeners(&mptcp_genl_family, net, MPTCP_PM_EV_GRP_OFFSET)) 1717 return; 1718 1719 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 1720 if (!skb) 1721 return; 1722 1723 nlh = genlmsg_put(skb, 0, 0, &mptcp_genl_family, 0, MPTCP_EVENT_REMOVED); 1724 if (!nlh) 1725 goto nla_put_failure; 1726 1727 if (nla_put_u32(skb, MPTCP_ATTR_TOKEN, msk->token)) 1728 goto nla_put_failure; 1729 1730 if (nla_put_u8(skb, MPTCP_ATTR_REM_ID, id)) 1731 goto nla_put_failure; 1732 1733 genlmsg_end(skb, nlh); 1734 mptcp_nl_mcast_send(net, skb, GFP_ATOMIC); 1735 return; 1736 1737 nla_put_failure: 1738 kfree_skb(skb); 1739 } 1740 1741 void mptcp_event_addr_announced(const struct mptcp_sock *msk, 1742 const struct mptcp_addr_info *info) 1743 { 1744 struct net *net = sock_net((const struct sock *)msk); 1745 struct nlmsghdr *nlh; 1746 struct sk_buff *skb; 1747 1748 if (!genl_has_listeners(&mptcp_genl_family, net, MPTCP_PM_EV_GRP_OFFSET)) 1749 return; 1750 1751 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 1752 if (!skb) 1753 return; 1754 1755 nlh = genlmsg_put(skb, 0, 0, &mptcp_genl_family, 0, 1756 MPTCP_EVENT_ANNOUNCED); 1757 if (!nlh) 1758 goto nla_put_failure; 1759 1760 if (nla_put_u32(skb, MPTCP_ATTR_TOKEN, msk->token)) 1761 goto nla_put_failure; 1762 1763 if (nla_put_u8(skb, MPTCP_ATTR_REM_ID, info->id)) 1764 goto nla_put_failure; 1765 1766 if (nla_put_be16(skb, MPTCP_ATTR_DPORT, info->port)) 1767 goto nla_put_failure; 1768 1769 switch (info->family) { 1770 case AF_INET: 1771 if (nla_put_in_addr(skb, MPTCP_ATTR_DADDR4, info->addr.s_addr)) 1772 goto nla_put_failure; 1773 break; 1774 #if IS_ENABLED(CONFIG_MPTCP_IPV6) 1775 case AF_INET6: 1776 if (nla_put_in6_addr(skb, MPTCP_ATTR_DADDR6, &info->addr6)) 1777 goto nla_put_failure; 1778 break; 1779 #endif 1780 default: 1781 WARN_ON_ONCE(1); 1782 goto nla_put_failure; 1783 } 1784 1785 genlmsg_end(skb, nlh); 1786 mptcp_nl_mcast_send(net, skb, GFP_ATOMIC); 1787 return; 1788 1789 nla_put_failure: 1790 kfree_skb(skb); 1791 } 1792 1793 void mptcp_event(enum mptcp_event_type type, const struct mptcp_sock *msk, 1794 const struct sock *ssk, gfp_t gfp) 1795 { 1796 struct net *net = sock_net((const struct sock *)msk); 1797 struct nlmsghdr *nlh; 1798 struct sk_buff *skb; 1799 1800 if (!genl_has_listeners(&mptcp_genl_family, net, MPTCP_PM_EV_GRP_OFFSET)) 1801 return; 1802 1803 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, gfp); 1804 if (!skb) 1805 return; 1806 1807 nlh = genlmsg_put(skb, 0, 0, &mptcp_genl_family, 0, type); 1808 if (!nlh) 1809 goto nla_put_failure; 1810 1811 switch (type) { 1812 case MPTCP_EVENT_UNSPEC: 1813 WARN_ON_ONCE(1); 1814 break; 1815 case MPTCP_EVENT_CREATED: 1816 case MPTCP_EVENT_ESTABLISHED: 1817 if (mptcp_event_created(skb, msk, ssk) < 0) 1818 goto nla_put_failure; 1819 break; 1820 case MPTCP_EVENT_CLOSED: 1821 if (nla_put_u32(skb, MPTCP_ATTR_TOKEN, msk->token) < 0) 1822 goto nla_put_failure; 1823 break; 1824 case MPTCP_EVENT_ANNOUNCED: 1825 case MPTCP_EVENT_REMOVED: 1826 /* call mptcp_event_addr_announced()/removed instead */ 1827 WARN_ON_ONCE(1); 1828 break; 1829 case MPTCP_EVENT_SUB_ESTABLISHED: 1830 case MPTCP_EVENT_SUB_PRIORITY: 1831 if (mptcp_event_sub_established(skb, msk, ssk) < 0) 1832 goto nla_put_failure; 1833 break; 1834 case MPTCP_EVENT_SUB_CLOSED: 1835 if (mptcp_event_sub_closed(skb, msk, ssk) < 0) 1836 goto nla_put_failure; 1837 break; 1838 } 1839 1840 genlmsg_end(skb, nlh); 1841 mptcp_nl_mcast_send(net, skb, gfp); 1842 return; 1843 1844 nla_put_failure: 1845 kfree_skb(skb); 1846 } 1847 1848 static const struct genl_small_ops mptcp_pm_ops[] = { 1849 { 1850 .cmd = MPTCP_PM_CMD_ADD_ADDR, 1851 .doit = mptcp_nl_cmd_add_addr, 1852 .flags = GENL_ADMIN_PERM, 1853 }, 1854 { 1855 .cmd = MPTCP_PM_CMD_DEL_ADDR, 1856 .doit = mptcp_nl_cmd_del_addr, 1857 .flags = GENL_ADMIN_PERM, 1858 }, 1859 { 1860 .cmd = MPTCP_PM_CMD_FLUSH_ADDRS, 1861 .doit = mptcp_nl_cmd_flush_addrs, 1862 .flags = GENL_ADMIN_PERM, 1863 }, 1864 { 1865 .cmd = MPTCP_PM_CMD_GET_ADDR, 1866 .doit = mptcp_nl_cmd_get_addr, 1867 .dumpit = mptcp_nl_cmd_dump_addrs, 1868 }, 1869 { 1870 .cmd = MPTCP_PM_CMD_SET_LIMITS, 1871 .doit = mptcp_nl_cmd_set_limits, 1872 .flags = GENL_ADMIN_PERM, 1873 }, 1874 { 1875 .cmd = MPTCP_PM_CMD_GET_LIMITS, 1876 .doit = mptcp_nl_cmd_get_limits, 1877 }, 1878 { 1879 .cmd = MPTCP_PM_CMD_SET_FLAGS, 1880 .doit = mptcp_nl_cmd_set_flags, 1881 .flags = GENL_ADMIN_PERM, 1882 }, 1883 }; 1884 1885 static struct genl_family mptcp_genl_family __ro_after_init = { 1886 .name = MPTCP_PM_NAME, 1887 .version = MPTCP_PM_VER, 1888 .maxattr = MPTCP_PM_ATTR_MAX, 1889 .policy = mptcp_pm_policy, 1890 .netnsok = true, 1891 .module = THIS_MODULE, 1892 .small_ops = mptcp_pm_ops, 1893 .n_small_ops = ARRAY_SIZE(mptcp_pm_ops), 1894 .mcgrps = mptcp_pm_mcgrps, 1895 .n_mcgrps = ARRAY_SIZE(mptcp_pm_mcgrps), 1896 }; 1897 1898 static int __net_init pm_nl_init_net(struct net *net) 1899 { 1900 struct pm_nl_pernet *pernet = net_generic(net, pm_nl_pernet_id); 1901 1902 INIT_LIST_HEAD_RCU(&pernet->local_addr_list); 1903 pernet->next_id = 1; 1904 spin_lock_init(&pernet->lock); 1905 1906 /* No need to initialize other pernet fields, the struct is zeroed at 1907 * allocation time. 1908 */ 1909 1910 return 0; 1911 } 1912 1913 static void __net_exit pm_nl_exit_net(struct list_head *net_list) 1914 { 1915 struct net *net; 1916 1917 list_for_each_entry(net, net_list, exit_list) { 1918 struct pm_nl_pernet *pernet = net_generic(net, pm_nl_pernet_id); 1919 1920 /* net is removed from namespace list, can't race with 1921 * other modifiers, also netns core already waited for a 1922 * RCU grace period. 1923 */ 1924 __flush_addrs(&pernet->local_addr_list); 1925 } 1926 } 1927 1928 static struct pernet_operations mptcp_pm_pernet_ops = { 1929 .init = pm_nl_init_net, 1930 .exit_batch = pm_nl_exit_net, 1931 .id = &pm_nl_pernet_id, 1932 .size = sizeof(struct pm_nl_pernet), 1933 }; 1934 1935 void __init mptcp_pm_nl_init(void) 1936 { 1937 if (register_pernet_subsys(&mptcp_pm_pernet_ops) < 0) 1938 panic("Failed to register MPTCP PM pernet subsystem.\n"); 1939 1940 if (genl_register_family(&mptcp_genl_family)) 1941 panic("Failed to register MPTCP PM netlink family\n"); 1942 } 1943