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, bool check_id) 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 && (!check_id || entry->addr.id == addr->id)) 357 entry->retrans_times = ADD_ADDR_RETRANS_MAX; 358 spin_unlock_bh(&msk->pm.lock); 359 360 if (entry && (!check_id || entry->addr.id == addr->id)) 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 if (!(entry->flags & MPTCP_PM_ADDR_FLAG_SIGNAL)) { 976 NL_SET_ERR_MSG_ATTR(info->extack, attr, 977 "flags must have signal when using port"); 978 return -EINVAL; 979 } 980 entry->addr.port = htons(nla_get_u16(tb[MPTCP_PM_ADDR_ATTR_PORT])); 981 } 982 983 return 0; 984 } 985 986 static struct pm_nl_pernet *genl_info_pm_nl(struct genl_info *info) 987 { 988 return net_generic(genl_info_net(info), pm_nl_pernet_id); 989 } 990 991 static int mptcp_nl_add_subflow_or_signal_addr(struct net *net) 992 { 993 struct mptcp_sock *msk; 994 long s_slot = 0, s_num = 0; 995 996 while ((msk = mptcp_token_iter_next(net, &s_slot, &s_num)) != NULL) { 997 struct sock *sk = (struct sock *)msk; 998 999 if (!READ_ONCE(msk->fully_established)) 1000 goto next; 1001 1002 lock_sock(sk); 1003 spin_lock_bh(&msk->pm.lock); 1004 mptcp_pm_create_subflow_or_signal_addr(msk); 1005 spin_unlock_bh(&msk->pm.lock); 1006 release_sock(sk); 1007 1008 next: 1009 sock_put(sk); 1010 cond_resched(); 1011 } 1012 1013 return 0; 1014 } 1015 1016 static int mptcp_nl_cmd_add_addr(struct sk_buff *skb, struct genl_info *info) 1017 { 1018 struct nlattr *attr = info->attrs[MPTCP_PM_ATTR_ADDR]; 1019 struct pm_nl_pernet *pernet = genl_info_pm_nl(info); 1020 struct mptcp_pm_addr_entry addr, *entry; 1021 int ret; 1022 1023 ret = mptcp_pm_parse_addr(attr, info, true, &addr); 1024 if (ret < 0) 1025 return ret; 1026 1027 entry = kmalloc(sizeof(*entry), GFP_KERNEL); 1028 if (!entry) { 1029 GENL_SET_ERR_MSG(info, "can't allocate addr"); 1030 return -ENOMEM; 1031 } 1032 1033 *entry = addr; 1034 if (entry->addr.port) { 1035 ret = mptcp_pm_nl_create_listen_socket(skb->sk, entry); 1036 if (ret) { 1037 GENL_SET_ERR_MSG(info, "create listen socket error"); 1038 kfree(entry); 1039 return ret; 1040 } 1041 } 1042 ret = mptcp_pm_nl_append_new_local_addr(pernet, entry); 1043 if (ret < 0) { 1044 GENL_SET_ERR_MSG(info, "too many addresses or duplicate one"); 1045 if (entry->lsk) 1046 sock_release(entry->lsk); 1047 kfree(entry); 1048 return ret; 1049 } 1050 1051 mptcp_nl_add_subflow_or_signal_addr(sock_net(skb->sk)); 1052 1053 return 0; 1054 } 1055 1056 static struct mptcp_pm_addr_entry * 1057 __lookup_addr_by_id(struct pm_nl_pernet *pernet, unsigned int id) 1058 { 1059 struct mptcp_pm_addr_entry *entry; 1060 1061 list_for_each_entry(entry, &pernet->local_addr_list, list) { 1062 if (entry->addr.id == id) 1063 return entry; 1064 } 1065 return NULL; 1066 } 1067 1068 static bool remove_anno_list_by_saddr(struct mptcp_sock *msk, 1069 struct mptcp_addr_info *addr) 1070 { 1071 struct mptcp_pm_add_entry *entry; 1072 1073 entry = mptcp_pm_del_add_timer(msk, addr, false); 1074 if (entry) { 1075 list_del(&entry->list); 1076 kfree(entry); 1077 return true; 1078 } 1079 1080 return false; 1081 } 1082 1083 static bool mptcp_pm_remove_anno_addr(struct mptcp_sock *msk, 1084 struct mptcp_addr_info *addr, 1085 bool force) 1086 { 1087 struct mptcp_rm_list list = { .nr = 0 }; 1088 bool ret; 1089 1090 list.ids[list.nr++] = addr->id; 1091 1092 ret = remove_anno_list_by_saddr(msk, addr); 1093 if (ret || force) { 1094 spin_lock_bh(&msk->pm.lock); 1095 mptcp_pm_remove_addr(msk, &list); 1096 spin_unlock_bh(&msk->pm.lock); 1097 } 1098 return ret; 1099 } 1100 1101 static int mptcp_nl_remove_subflow_and_signal_addr(struct net *net, 1102 struct mptcp_addr_info *addr) 1103 { 1104 struct mptcp_sock *msk; 1105 long s_slot = 0, s_num = 0; 1106 struct mptcp_rm_list list = { .nr = 0 }; 1107 1108 pr_debug("remove_id=%d", addr->id); 1109 1110 list.ids[list.nr++] = addr->id; 1111 1112 while ((msk = mptcp_token_iter_next(net, &s_slot, &s_num)) != NULL) { 1113 struct sock *sk = (struct sock *)msk; 1114 bool remove_subflow; 1115 1116 if (list_empty(&msk->conn_list)) { 1117 mptcp_pm_remove_anno_addr(msk, addr, false); 1118 goto next; 1119 } 1120 1121 lock_sock(sk); 1122 remove_subflow = lookup_subflow_by_saddr(&msk->conn_list, addr); 1123 mptcp_pm_remove_anno_addr(msk, addr, remove_subflow); 1124 if (remove_subflow) 1125 mptcp_pm_remove_subflow(msk, &list); 1126 release_sock(sk); 1127 1128 next: 1129 sock_put(sk); 1130 cond_resched(); 1131 } 1132 1133 return 0; 1134 } 1135 1136 struct addr_entry_release_work { 1137 struct rcu_work rwork; 1138 struct mptcp_pm_addr_entry *entry; 1139 }; 1140 1141 static void mptcp_pm_release_addr_entry(struct work_struct *work) 1142 { 1143 struct addr_entry_release_work *w; 1144 struct mptcp_pm_addr_entry *entry; 1145 1146 w = container_of(to_rcu_work(work), struct addr_entry_release_work, rwork); 1147 entry = w->entry; 1148 if (entry) { 1149 if (entry->lsk) 1150 sock_release(entry->lsk); 1151 kfree(entry); 1152 } 1153 kfree(w); 1154 } 1155 1156 static void mptcp_pm_free_addr_entry(struct mptcp_pm_addr_entry *entry) 1157 { 1158 struct addr_entry_release_work *w; 1159 1160 w = kmalloc(sizeof(*w), GFP_ATOMIC); 1161 if (w) { 1162 INIT_RCU_WORK(&w->rwork, mptcp_pm_release_addr_entry); 1163 w->entry = entry; 1164 queue_rcu_work(system_wq, &w->rwork); 1165 } 1166 } 1167 1168 static int mptcp_nl_remove_id_zero_address(struct net *net, 1169 struct mptcp_addr_info *addr) 1170 { 1171 struct mptcp_rm_list list = { .nr = 0 }; 1172 long s_slot = 0, s_num = 0; 1173 struct mptcp_sock *msk; 1174 1175 list.ids[list.nr++] = 0; 1176 1177 while ((msk = mptcp_token_iter_next(net, &s_slot, &s_num)) != NULL) { 1178 struct sock *sk = (struct sock *)msk; 1179 struct mptcp_addr_info msk_local; 1180 1181 if (list_empty(&msk->conn_list)) 1182 goto next; 1183 1184 local_address((struct sock_common *)msk, &msk_local); 1185 if (!addresses_equal(&msk_local, addr, addr->port)) 1186 goto next; 1187 1188 lock_sock(sk); 1189 spin_lock_bh(&msk->pm.lock); 1190 mptcp_pm_remove_addr(msk, &list); 1191 mptcp_pm_nl_rm_subflow_received(msk, &list); 1192 spin_unlock_bh(&msk->pm.lock); 1193 release_sock(sk); 1194 1195 next: 1196 sock_put(sk); 1197 cond_resched(); 1198 } 1199 1200 return 0; 1201 } 1202 1203 static int mptcp_nl_cmd_del_addr(struct sk_buff *skb, struct genl_info *info) 1204 { 1205 struct nlattr *attr = info->attrs[MPTCP_PM_ATTR_ADDR]; 1206 struct pm_nl_pernet *pernet = genl_info_pm_nl(info); 1207 struct mptcp_pm_addr_entry addr, *entry; 1208 unsigned int addr_max; 1209 int ret; 1210 1211 ret = mptcp_pm_parse_addr(attr, info, false, &addr); 1212 if (ret < 0) 1213 return ret; 1214 1215 /* the zero id address is special: the first address used by the msk 1216 * always gets such an id, so different subflows can have different zero 1217 * id addresses. Additionally zero id is not accounted for in id_bitmap. 1218 * Let's use an 'mptcp_rm_list' instead of the common remove code. 1219 */ 1220 if (addr.addr.id == 0) 1221 return mptcp_nl_remove_id_zero_address(sock_net(skb->sk), &addr.addr); 1222 1223 spin_lock_bh(&pernet->lock); 1224 entry = __lookup_addr_by_id(pernet, addr.addr.id); 1225 if (!entry) { 1226 GENL_SET_ERR_MSG(info, "address not found"); 1227 spin_unlock_bh(&pernet->lock); 1228 return -EINVAL; 1229 } 1230 if (entry->flags & MPTCP_PM_ADDR_FLAG_SIGNAL) { 1231 addr_max = pernet->add_addr_signal_max; 1232 WRITE_ONCE(pernet->add_addr_signal_max, addr_max - 1); 1233 } 1234 if (entry->flags & MPTCP_PM_ADDR_FLAG_SUBFLOW) { 1235 addr_max = pernet->local_addr_max; 1236 WRITE_ONCE(pernet->local_addr_max, addr_max - 1); 1237 } 1238 1239 pernet->addrs--; 1240 list_del_rcu(&entry->list); 1241 __clear_bit(entry->addr.id, pernet->id_bitmap); 1242 spin_unlock_bh(&pernet->lock); 1243 1244 mptcp_nl_remove_subflow_and_signal_addr(sock_net(skb->sk), &entry->addr); 1245 mptcp_pm_free_addr_entry(entry); 1246 1247 return ret; 1248 } 1249 1250 static void mptcp_pm_remove_addrs_and_subflows(struct mptcp_sock *msk, 1251 struct list_head *rm_list) 1252 { 1253 struct mptcp_rm_list alist = { .nr = 0 }, slist = { .nr = 0 }; 1254 struct mptcp_pm_addr_entry *entry; 1255 1256 list_for_each_entry(entry, rm_list, list) { 1257 if (lookup_subflow_by_saddr(&msk->conn_list, &entry->addr) && 1258 alist.nr < MPTCP_RM_IDS_MAX && 1259 slist.nr < MPTCP_RM_IDS_MAX) { 1260 alist.ids[alist.nr++] = entry->addr.id; 1261 slist.ids[slist.nr++] = entry->addr.id; 1262 } else if (remove_anno_list_by_saddr(msk, &entry->addr) && 1263 alist.nr < MPTCP_RM_IDS_MAX) { 1264 alist.ids[alist.nr++] = entry->addr.id; 1265 } 1266 } 1267 1268 if (alist.nr) { 1269 spin_lock_bh(&msk->pm.lock); 1270 mptcp_pm_remove_addr(msk, &alist); 1271 spin_unlock_bh(&msk->pm.lock); 1272 } 1273 if (slist.nr) 1274 mptcp_pm_remove_subflow(msk, &slist); 1275 } 1276 1277 static void mptcp_nl_remove_addrs_list(struct net *net, 1278 struct list_head *rm_list) 1279 { 1280 long s_slot = 0, s_num = 0; 1281 struct mptcp_sock *msk; 1282 1283 if (list_empty(rm_list)) 1284 return; 1285 1286 while ((msk = mptcp_token_iter_next(net, &s_slot, &s_num)) != NULL) { 1287 struct sock *sk = (struct sock *)msk; 1288 1289 lock_sock(sk); 1290 mptcp_pm_remove_addrs_and_subflows(msk, rm_list); 1291 release_sock(sk); 1292 1293 sock_put(sk); 1294 cond_resched(); 1295 } 1296 } 1297 1298 static void __flush_addrs(struct list_head *list) 1299 { 1300 while (!list_empty(list)) { 1301 struct mptcp_pm_addr_entry *cur; 1302 1303 cur = list_entry(list->next, 1304 struct mptcp_pm_addr_entry, list); 1305 list_del_rcu(&cur->list); 1306 mptcp_pm_free_addr_entry(cur); 1307 } 1308 } 1309 1310 static void __reset_counters(struct pm_nl_pernet *pernet) 1311 { 1312 WRITE_ONCE(pernet->add_addr_signal_max, 0); 1313 WRITE_ONCE(pernet->add_addr_accept_max, 0); 1314 WRITE_ONCE(pernet->local_addr_max, 0); 1315 pernet->addrs = 0; 1316 } 1317 1318 static int mptcp_nl_cmd_flush_addrs(struct sk_buff *skb, struct genl_info *info) 1319 { 1320 struct pm_nl_pernet *pernet = genl_info_pm_nl(info); 1321 LIST_HEAD(free_list); 1322 1323 spin_lock_bh(&pernet->lock); 1324 list_splice_init(&pernet->local_addr_list, &free_list); 1325 __reset_counters(pernet); 1326 pernet->next_id = 1; 1327 bitmap_zero(pernet->id_bitmap, MAX_ADDR_ID + 1); 1328 spin_unlock_bh(&pernet->lock); 1329 mptcp_nl_remove_addrs_list(sock_net(skb->sk), &free_list); 1330 __flush_addrs(&free_list); 1331 return 0; 1332 } 1333 1334 static int mptcp_nl_fill_addr(struct sk_buff *skb, 1335 struct mptcp_pm_addr_entry *entry) 1336 { 1337 struct mptcp_addr_info *addr = &entry->addr; 1338 struct nlattr *attr; 1339 1340 attr = nla_nest_start(skb, MPTCP_PM_ATTR_ADDR); 1341 if (!attr) 1342 return -EMSGSIZE; 1343 1344 if (nla_put_u16(skb, MPTCP_PM_ADDR_ATTR_FAMILY, addr->family)) 1345 goto nla_put_failure; 1346 if (nla_put_u16(skb, MPTCP_PM_ADDR_ATTR_PORT, ntohs(addr->port))) 1347 goto nla_put_failure; 1348 if (nla_put_u8(skb, MPTCP_PM_ADDR_ATTR_ID, addr->id)) 1349 goto nla_put_failure; 1350 if (nla_put_u32(skb, MPTCP_PM_ADDR_ATTR_FLAGS, entry->flags)) 1351 goto nla_put_failure; 1352 if (entry->ifindex && 1353 nla_put_s32(skb, MPTCP_PM_ADDR_ATTR_IF_IDX, entry->ifindex)) 1354 goto nla_put_failure; 1355 1356 if (addr->family == AF_INET && 1357 nla_put_in_addr(skb, MPTCP_PM_ADDR_ATTR_ADDR4, 1358 addr->addr.s_addr)) 1359 goto nla_put_failure; 1360 #if IS_ENABLED(CONFIG_MPTCP_IPV6) 1361 else if (addr->family == AF_INET6 && 1362 nla_put_in6_addr(skb, MPTCP_PM_ADDR_ATTR_ADDR6, &addr->addr6)) 1363 goto nla_put_failure; 1364 #endif 1365 nla_nest_end(skb, attr); 1366 return 0; 1367 1368 nla_put_failure: 1369 nla_nest_cancel(skb, attr); 1370 return -EMSGSIZE; 1371 } 1372 1373 static int mptcp_nl_cmd_get_addr(struct sk_buff *skb, struct genl_info *info) 1374 { 1375 struct nlattr *attr = info->attrs[MPTCP_PM_ATTR_ADDR]; 1376 struct pm_nl_pernet *pernet = genl_info_pm_nl(info); 1377 struct mptcp_pm_addr_entry addr, *entry; 1378 struct sk_buff *msg; 1379 void *reply; 1380 int ret; 1381 1382 ret = mptcp_pm_parse_addr(attr, info, false, &addr); 1383 if (ret < 0) 1384 return ret; 1385 1386 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1387 if (!msg) 1388 return -ENOMEM; 1389 1390 reply = genlmsg_put_reply(msg, info, &mptcp_genl_family, 0, 1391 info->genlhdr->cmd); 1392 if (!reply) { 1393 GENL_SET_ERR_MSG(info, "not enough space in Netlink message"); 1394 ret = -EMSGSIZE; 1395 goto fail; 1396 } 1397 1398 spin_lock_bh(&pernet->lock); 1399 entry = __lookup_addr_by_id(pernet, addr.addr.id); 1400 if (!entry) { 1401 GENL_SET_ERR_MSG(info, "address not found"); 1402 ret = -EINVAL; 1403 goto unlock_fail; 1404 } 1405 1406 ret = mptcp_nl_fill_addr(msg, entry); 1407 if (ret) 1408 goto unlock_fail; 1409 1410 genlmsg_end(msg, reply); 1411 ret = genlmsg_reply(msg, info); 1412 spin_unlock_bh(&pernet->lock); 1413 return ret; 1414 1415 unlock_fail: 1416 spin_unlock_bh(&pernet->lock); 1417 1418 fail: 1419 nlmsg_free(msg); 1420 return ret; 1421 } 1422 1423 static int mptcp_nl_cmd_dump_addrs(struct sk_buff *msg, 1424 struct netlink_callback *cb) 1425 { 1426 struct net *net = sock_net(msg->sk); 1427 struct mptcp_pm_addr_entry *entry; 1428 struct pm_nl_pernet *pernet; 1429 int id = cb->args[0]; 1430 void *hdr; 1431 int i; 1432 1433 pernet = net_generic(net, pm_nl_pernet_id); 1434 1435 spin_lock_bh(&pernet->lock); 1436 for (i = id; i < MAX_ADDR_ID + 1; i++) { 1437 if (test_bit(i, pernet->id_bitmap)) { 1438 entry = __lookup_addr_by_id(pernet, i); 1439 if (!entry) 1440 break; 1441 1442 if (entry->addr.id <= id) 1443 continue; 1444 1445 hdr = genlmsg_put(msg, NETLINK_CB(cb->skb).portid, 1446 cb->nlh->nlmsg_seq, &mptcp_genl_family, 1447 NLM_F_MULTI, MPTCP_PM_CMD_GET_ADDR); 1448 if (!hdr) 1449 break; 1450 1451 if (mptcp_nl_fill_addr(msg, entry) < 0) { 1452 genlmsg_cancel(msg, hdr); 1453 break; 1454 } 1455 1456 id = entry->addr.id; 1457 genlmsg_end(msg, hdr); 1458 } 1459 } 1460 spin_unlock_bh(&pernet->lock); 1461 1462 cb->args[0] = id; 1463 return msg->len; 1464 } 1465 1466 static int parse_limit(struct genl_info *info, int id, unsigned int *limit) 1467 { 1468 struct nlattr *attr = info->attrs[id]; 1469 1470 if (!attr) 1471 return 0; 1472 1473 *limit = nla_get_u32(attr); 1474 if (*limit > MPTCP_PM_ADDR_MAX) { 1475 GENL_SET_ERR_MSG(info, "limit greater than maximum"); 1476 return -EINVAL; 1477 } 1478 return 0; 1479 } 1480 1481 static int 1482 mptcp_nl_cmd_set_limits(struct sk_buff *skb, struct genl_info *info) 1483 { 1484 struct pm_nl_pernet *pernet = genl_info_pm_nl(info); 1485 unsigned int rcv_addrs, subflows; 1486 int ret; 1487 1488 spin_lock_bh(&pernet->lock); 1489 rcv_addrs = pernet->add_addr_accept_max; 1490 ret = parse_limit(info, MPTCP_PM_ATTR_RCV_ADD_ADDRS, &rcv_addrs); 1491 if (ret) 1492 goto unlock; 1493 1494 subflows = pernet->subflows_max; 1495 ret = parse_limit(info, MPTCP_PM_ATTR_SUBFLOWS, &subflows); 1496 if (ret) 1497 goto unlock; 1498 1499 WRITE_ONCE(pernet->add_addr_accept_max, rcv_addrs); 1500 WRITE_ONCE(pernet->subflows_max, subflows); 1501 1502 unlock: 1503 spin_unlock_bh(&pernet->lock); 1504 return ret; 1505 } 1506 1507 static int 1508 mptcp_nl_cmd_get_limits(struct sk_buff *skb, struct genl_info *info) 1509 { 1510 struct pm_nl_pernet *pernet = genl_info_pm_nl(info); 1511 struct sk_buff *msg; 1512 void *reply; 1513 1514 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1515 if (!msg) 1516 return -ENOMEM; 1517 1518 reply = genlmsg_put_reply(msg, info, &mptcp_genl_family, 0, 1519 MPTCP_PM_CMD_GET_LIMITS); 1520 if (!reply) 1521 goto fail; 1522 1523 if (nla_put_u32(msg, MPTCP_PM_ATTR_RCV_ADD_ADDRS, 1524 READ_ONCE(pernet->add_addr_accept_max))) 1525 goto fail; 1526 1527 if (nla_put_u32(msg, MPTCP_PM_ATTR_SUBFLOWS, 1528 READ_ONCE(pernet->subflows_max))) 1529 goto fail; 1530 1531 genlmsg_end(msg, reply); 1532 return genlmsg_reply(msg, info); 1533 1534 fail: 1535 GENL_SET_ERR_MSG(info, "not enough space in Netlink message"); 1536 nlmsg_free(msg); 1537 return -EMSGSIZE; 1538 } 1539 1540 static int mptcp_nl_addr_backup(struct net *net, 1541 struct mptcp_addr_info *addr, 1542 u8 bkup) 1543 { 1544 long s_slot = 0, s_num = 0; 1545 struct mptcp_sock *msk; 1546 int ret = -EINVAL; 1547 1548 while ((msk = mptcp_token_iter_next(net, &s_slot, &s_num)) != NULL) { 1549 struct sock *sk = (struct sock *)msk; 1550 1551 if (list_empty(&msk->conn_list)) 1552 goto next; 1553 1554 lock_sock(sk); 1555 spin_lock_bh(&msk->pm.lock); 1556 ret = mptcp_pm_nl_mp_prio_send_ack(msk, addr, bkup); 1557 spin_unlock_bh(&msk->pm.lock); 1558 release_sock(sk); 1559 1560 next: 1561 sock_put(sk); 1562 cond_resched(); 1563 } 1564 1565 return ret; 1566 } 1567 1568 static int mptcp_nl_cmd_set_flags(struct sk_buff *skb, struct genl_info *info) 1569 { 1570 struct nlattr *attr = info->attrs[MPTCP_PM_ATTR_ADDR]; 1571 struct pm_nl_pernet *pernet = genl_info_pm_nl(info); 1572 struct mptcp_pm_addr_entry addr, *entry; 1573 struct net *net = sock_net(skb->sk); 1574 u8 bkup = 0; 1575 int ret; 1576 1577 ret = mptcp_pm_parse_addr(attr, info, true, &addr); 1578 if (ret < 0) 1579 return ret; 1580 1581 if (addr.flags & MPTCP_PM_ADDR_FLAG_BACKUP) 1582 bkup = 1; 1583 1584 list_for_each_entry(entry, &pernet->local_addr_list, list) { 1585 if (addresses_equal(&entry->addr, &addr.addr, true)) { 1586 ret = mptcp_nl_addr_backup(net, &entry->addr, bkup); 1587 if (ret) 1588 return ret; 1589 1590 if (bkup) 1591 entry->flags |= MPTCP_PM_ADDR_FLAG_BACKUP; 1592 else 1593 entry->flags &= ~MPTCP_PM_ADDR_FLAG_BACKUP; 1594 } 1595 } 1596 1597 return 0; 1598 } 1599 1600 static void mptcp_nl_mcast_send(struct net *net, struct sk_buff *nlskb, gfp_t gfp) 1601 { 1602 genlmsg_multicast_netns(&mptcp_genl_family, net, 1603 nlskb, 0, MPTCP_PM_EV_GRP_OFFSET, gfp); 1604 } 1605 1606 static int mptcp_event_add_subflow(struct sk_buff *skb, const struct sock *ssk) 1607 { 1608 const struct inet_sock *issk = inet_sk(ssk); 1609 const struct mptcp_subflow_context *sf; 1610 1611 if (nla_put_u16(skb, MPTCP_ATTR_FAMILY, ssk->sk_family)) 1612 return -EMSGSIZE; 1613 1614 switch (ssk->sk_family) { 1615 case AF_INET: 1616 if (nla_put_in_addr(skb, MPTCP_ATTR_SADDR4, issk->inet_saddr)) 1617 return -EMSGSIZE; 1618 if (nla_put_in_addr(skb, MPTCP_ATTR_DADDR4, issk->inet_daddr)) 1619 return -EMSGSIZE; 1620 break; 1621 #if IS_ENABLED(CONFIG_MPTCP_IPV6) 1622 case AF_INET6: { 1623 const struct ipv6_pinfo *np = inet6_sk(ssk); 1624 1625 if (nla_put_in6_addr(skb, MPTCP_ATTR_SADDR6, &np->saddr)) 1626 return -EMSGSIZE; 1627 if (nla_put_in6_addr(skb, MPTCP_ATTR_DADDR6, &ssk->sk_v6_daddr)) 1628 return -EMSGSIZE; 1629 break; 1630 } 1631 #endif 1632 default: 1633 WARN_ON_ONCE(1); 1634 return -EMSGSIZE; 1635 } 1636 1637 if (nla_put_be16(skb, MPTCP_ATTR_SPORT, issk->inet_sport)) 1638 return -EMSGSIZE; 1639 if (nla_put_be16(skb, MPTCP_ATTR_DPORT, issk->inet_dport)) 1640 return -EMSGSIZE; 1641 1642 sf = mptcp_subflow_ctx(ssk); 1643 if (WARN_ON_ONCE(!sf)) 1644 return -EINVAL; 1645 1646 if (nla_put_u8(skb, MPTCP_ATTR_LOC_ID, sf->local_id)) 1647 return -EMSGSIZE; 1648 1649 if (nla_put_u8(skb, MPTCP_ATTR_REM_ID, sf->remote_id)) 1650 return -EMSGSIZE; 1651 1652 return 0; 1653 } 1654 1655 static int mptcp_event_put_token_and_ssk(struct sk_buff *skb, 1656 const struct mptcp_sock *msk, 1657 const struct sock *ssk) 1658 { 1659 const struct sock *sk = (const struct sock *)msk; 1660 const struct mptcp_subflow_context *sf; 1661 u8 sk_err; 1662 1663 if (nla_put_u32(skb, MPTCP_ATTR_TOKEN, msk->token)) 1664 return -EMSGSIZE; 1665 1666 if (mptcp_event_add_subflow(skb, ssk)) 1667 return -EMSGSIZE; 1668 1669 sf = mptcp_subflow_ctx(ssk); 1670 if (WARN_ON_ONCE(!sf)) 1671 return -EINVAL; 1672 1673 if (nla_put_u8(skb, MPTCP_ATTR_BACKUP, sf->backup)) 1674 return -EMSGSIZE; 1675 1676 if (ssk->sk_bound_dev_if && 1677 nla_put_s32(skb, MPTCP_ATTR_IF_IDX, ssk->sk_bound_dev_if)) 1678 return -EMSGSIZE; 1679 1680 sk_err = ssk->sk_err; 1681 if (sk_err && sk->sk_state == TCP_ESTABLISHED && 1682 nla_put_u8(skb, MPTCP_ATTR_ERROR, sk_err)) 1683 return -EMSGSIZE; 1684 1685 return 0; 1686 } 1687 1688 static int mptcp_event_sub_established(struct sk_buff *skb, 1689 const struct mptcp_sock *msk, 1690 const struct sock *ssk) 1691 { 1692 return mptcp_event_put_token_and_ssk(skb, msk, ssk); 1693 } 1694 1695 static int mptcp_event_sub_closed(struct sk_buff *skb, 1696 const struct mptcp_sock *msk, 1697 const struct sock *ssk) 1698 { 1699 const struct mptcp_subflow_context *sf; 1700 1701 if (mptcp_event_put_token_and_ssk(skb, msk, ssk)) 1702 return -EMSGSIZE; 1703 1704 sf = mptcp_subflow_ctx(ssk); 1705 if (!sf->reset_seen) 1706 return 0; 1707 1708 if (nla_put_u32(skb, MPTCP_ATTR_RESET_REASON, sf->reset_reason)) 1709 return -EMSGSIZE; 1710 1711 if (nla_put_u32(skb, MPTCP_ATTR_RESET_FLAGS, sf->reset_transient)) 1712 return -EMSGSIZE; 1713 1714 return 0; 1715 } 1716 1717 static int mptcp_event_created(struct sk_buff *skb, 1718 const struct mptcp_sock *msk, 1719 const struct sock *ssk) 1720 { 1721 int err = nla_put_u32(skb, MPTCP_ATTR_TOKEN, msk->token); 1722 1723 if (err) 1724 return err; 1725 1726 return mptcp_event_add_subflow(skb, ssk); 1727 } 1728 1729 void mptcp_event_addr_removed(const struct mptcp_sock *msk, uint8_t id) 1730 { 1731 struct net *net = sock_net((const struct sock *)msk); 1732 struct nlmsghdr *nlh; 1733 struct sk_buff *skb; 1734 1735 if (!genl_has_listeners(&mptcp_genl_family, net, MPTCP_PM_EV_GRP_OFFSET)) 1736 return; 1737 1738 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 1739 if (!skb) 1740 return; 1741 1742 nlh = genlmsg_put(skb, 0, 0, &mptcp_genl_family, 0, MPTCP_EVENT_REMOVED); 1743 if (!nlh) 1744 goto nla_put_failure; 1745 1746 if (nla_put_u32(skb, MPTCP_ATTR_TOKEN, msk->token)) 1747 goto nla_put_failure; 1748 1749 if (nla_put_u8(skb, MPTCP_ATTR_REM_ID, id)) 1750 goto nla_put_failure; 1751 1752 genlmsg_end(skb, nlh); 1753 mptcp_nl_mcast_send(net, skb, GFP_ATOMIC); 1754 return; 1755 1756 nla_put_failure: 1757 kfree_skb(skb); 1758 } 1759 1760 void mptcp_event_addr_announced(const struct mptcp_sock *msk, 1761 const struct mptcp_addr_info *info) 1762 { 1763 struct net *net = sock_net((const struct sock *)msk); 1764 struct nlmsghdr *nlh; 1765 struct sk_buff *skb; 1766 1767 if (!genl_has_listeners(&mptcp_genl_family, net, MPTCP_PM_EV_GRP_OFFSET)) 1768 return; 1769 1770 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 1771 if (!skb) 1772 return; 1773 1774 nlh = genlmsg_put(skb, 0, 0, &mptcp_genl_family, 0, 1775 MPTCP_EVENT_ANNOUNCED); 1776 if (!nlh) 1777 goto nla_put_failure; 1778 1779 if (nla_put_u32(skb, MPTCP_ATTR_TOKEN, msk->token)) 1780 goto nla_put_failure; 1781 1782 if (nla_put_u8(skb, MPTCP_ATTR_REM_ID, info->id)) 1783 goto nla_put_failure; 1784 1785 if (nla_put_be16(skb, MPTCP_ATTR_DPORT, info->port)) 1786 goto nla_put_failure; 1787 1788 switch (info->family) { 1789 case AF_INET: 1790 if (nla_put_in_addr(skb, MPTCP_ATTR_DADDR4, info->addr.s_addr)) 1791 goto nla_put_failure; 1792 break; 1793 #if IS_ENABLED(CONFIG_MPTCP_IPV6) 1794 case AF_INET6: 1795 if (nla_put_in6_addr(skb, MPTCP_ATTR_DADDR6, &info->addr6)) 1796 goto nla_put_failure; 1797 break; 1798 #endif 1799 default: 1800 WARN_ON_ONCE(1); 1801 goto nla_put_failure; 1802 } 1803 1804 genlmsg_end(skb, nlh); 1805 mptcp_nl_mcast_send(net, skb, GFP_ATOMIC); 1806 return; 1807 1808 nla_put_failure: 1809 kfree_skb(skb); 1810 } 1811 1812 void mptcp_event(enum mptcp_event_type type, const struct mptcp_sock *msk, 1813 const struct sock *ssk, gfp_t gfp) 1814 { 1815 struct net *net = sock_net((const struct sock *)msk); 1816 struct nlmsghdr *nlh; 1817 struct sk_buff *skb; 1818 1819 if (!genl_has_listeners(&mptcp_genl_family, net, MPTCP_PM_EV_GRP_OFFSET)) 1820 return; 1821 1822 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, gfp); 1823 if (!skb) 1824 return; 1825 1826 nlh = genlmsg_put(skb, 0, 0, &mptcp_genl_family, 0, type); 1827 if (!nlh) 1828 goto nla_put_failure; 1829 1830 switch (type) { 1831 case MPTCP_EVENT_UNSPEC: 1832 WARN_ON_ONCE(1); 1833 break; 1834 case MPTCP_EVENT_CREATED: 1835 case MPTCP_EVENT_ESTABLISHED: 1836 if (mptcp_event_created(skb, msk, ssk) < 0) 1837 goto nla_put_failure; 1838 break; 1839 case MPTCP_EVENT_CLOSED: 1840 if (nla_put_u32(skb, MPTCP_ATTR_TOKEN, msk->token) < 0) 1841 goto nla_put_failure; 1842 break; 1843 case MPTCP_EVENT_ANNOUNCED: 1844 case MPTCP_EVENT_REMOVED: 1845 /* call mptcp_event_addr_announced()/removed instead */ 1846 WARN_ON_ONCE(1); 1847 break; 1848 case MPTCP_EVENT_SUB_ESTABLISHED: 1849 case MPTCP_EVENT_SUB_PRIORITY: 1850 if (mptcp_event_sub_established(skb, msk, ssk) < 0) 1851 goto nla_put_failure; 1852 break; 1853 case MPTCP_EVENT_SUB_CLOSED: 1854 if (mptcp_event_sub_closed(skb, msk, ssk) < 0) 1855 goto nla_put_failure; 1856 break; 1857 } 1858 1859 genlmsg_end(skb, nlh); 1860 mptcp_nl_mcast_send(net, skb, gfp); 1861 return; 1862 1863 nla_put_failure: 1864 kfree_skb(skb); 1865 } 1866 1867 static const struct genl_small_ops mptcp_pm_ops[] = { 1868 { 1869 .cmd = MPTCP_PM_CMD_ADD_ADDR, 1870 .doit = mptcp_nl_cmd_add_addr, 1871 .flags = GENL_ADMIN_PERM, 1872 }, 1873 { 1874 .cmd = MPTCP_PM_CMD_DEL_ADDR, 1875 .doit = mptcp_nl_cmd_del_addr, 1876 .flags = GENL_ADMIN_PERM, 1877 }, 1878 { 1879 .cmd = MPTCP_PM_CMD_FLUSH_ADDRS, 1880 .doit = mptcp_nl_cmd_flush_addrs, 1881 .flags = GENL_ADMIN_PERM, 1882 }, 1883 { 1884 .cmd = MPTCP_PM_CMD_GET_ADDR, 1885 .doit = mptcp_nl_cmd_get_addr, 1886 .dumpit = mptcp_nl_cmd_dump_addrs, 1887 }, 1888 { 1889 .cmd = MPTCP_PM_CMD_SET_LIMITS, 1890 .doit = mptcp_nl_cmd_set_limits, 1891 .flags = GENL_ADMIN_PERM, 1892 }, 1893 { 1894 .cmd = MPTCP_PM_CMD_GET_LIMITS, 1895 .doit = mptcp_nl_cmd_get_limits, 1896 }, 1897 { 1898 .cmd = MPTCP_PM_CMD_SET_FLAGS, 1899 .doit = mptcp_nl_cmd_set_flags, 1900 .flags = GENL_ADMIN_PERM, 1901 }, 1902 }; 1903 1904 static struct genl_family mptcp_genl_family __ro_after_init = { 1905 .name = MPTCP_PM_NAME, 1906 .version = MPTCP_PM_VER, 1907 .maxattr = MPTCP_PM_ATTR_MAX, 1908 .policy = mptcp_pm_policy, 1909 .netnsok = true, 1910 .module = THIS_MODULE, 1911 .small_ops = mptcp_pm_ops, 1912 .n_small_ops = ARRAY_SIZE(mptcp_pm_ops), 1913 .mcgrps = mptcp_pm_mcgrps, 1914 .n_mcgrps = ARRAY_SIZE(mptcp_pm_mcgrps), 1915 }; 1916 1917 static int __net_init pm_nl_init_net(struct net *net) 1918 { 1919 struct pm_nl_pernet *pernet = net_generic(net, pm_nl_pernet_id); 1920 1921 INIT_LIST_HEAD_RCU(&pernet->local_addr_list); 1922 pernet->next_id = 1; 1923 spin_lock_init(&pernet->lock); 1924 1925 /* No need to initialize other pernet fields, the struct is zeroed at 1926 * allocation time. 1927 */ 1928 1929 return 0; 1930 } 1931 1932 static void __net_exit pm_nl_exit_net(struct list_head *net_list) 1933 { 1934 struct net *net; 1935 1936 list_for_each_entry(net, net_list, exit_list) { 1937 struct pm_nl_pernet *pernet = net_generic(net, pm_nl_pernet_id); 1938 1939 /* net is removed from namespace list, can't race with 1940 * other modifiers 1941 */ 1942 __flush_addrs(&pernet->local_addr_list); 1943 } 1944 } 1945 1946 static struct pernet_operations mptcp_pm_pernet_ops = { 1947 .init = pm_nl_init_net, 1948 .exit_batch = pm_nl_exit_net, 1949 .id = &pm_nl_pernet_id, 1950 .size = sizeof(struct pm_nl_pernet), 1951 }; 1952 1953 void __init mptcp_pm_nl_init(void) 1954 { 1955 if (register_pernet_subsys(&mptcp_pm_pernet_ops) < 0) 1956 panic("Failed to register MPTCP PM pernet subsystem.\n"); 1957 1958 if (genl_register_family(&mptcp_genl_family)) 1959 panic("Failed to register MPTCP PM netlink family\n"); 1960 } 1961