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 struct addr_entry_release_work { 1139 struct rcu_work rwork; 1140 struct mptcp_pm_addr_entry *entry; 1141 }; 1142 1143 static void mptcp_pm_release_addr_entry(struct work_struct *work) 1144 { 1145 struct addr_entry_release_work *w; 1146 struct mptcp_pm_addr_entry *entry; 1147 1148 w = container_of(to_rcu_work(work), struct addr_entry_release_work, rwork); 1149 entry = w->entry; 1150 if (entry) { 1151 if (entry->lsk) 1152 sock_release(entry->lsk); 1153 kfree(entry); 1154 } 1155 kfree(w); 1156 } 1157 1158 static void mptcp_pm_free_addr_entry(struct mptcp_pm_addr_entry *entry) 1159 { 1160 struct addr_entry_release_work *w; 1161 1162 w = kmalloc(sizeof(*w), GFP_ATOMIC); 1163 if (w) { 1164 INIT_RCU_WORK(&w->rwork, mptcp_pm_release_addr_entry); 1165 w->entry = entry; 1166 queue_rcu_work(system_wq, &w->rwork); 1167 } 1168 } 1169 1170 static int mptcp_nl_remove_id_zero_address(struct net *net, 1171 struct mptcp_addr_info *addr) 1172 { 1173 struct mptcp_rm_list list = { .nr = 0 }; 1174 long s_slot = 0, s_num = 0; 1175 struct mptcp_sock *msk; 1176 1177 list.ids[list.nr++] = 0; 1178 1179 while ((msk = mptcp_token_iter_next(net, &s_slot, &s_num)) != NULL) { 1180 struct sock *sk = (struct sock *)msk; 1181 struct mptcp_addr_info msk_local; 1182 1183 if (list_empty(&msk->conn_list)) 1184 goto next; 1185 1186 local_address((struct sock_common *)msk, &msk_local); 1187 if (!addresses_equal(&msk_local, addr, addr->port)) 1188 goto next; 1189 1190 lock_sock(sk); 1191 spin_lock_bh(&msk->pm.lock); 1192 mptcp_pm_remove_addr(msk, &list); 1193 mptcp_pm_nl_rm_subflow_received(msk, &list); 1194 spin_unlock_bh(&msk->pm.lock); 1195 release_sock(sk); 1196 1197 next: 1198 sock_put(sk); 1199 cond_resched(); 1200 } 1201 1202 return 0; 1203 } 1204 1205 static int mptcp_nl_cmd_del_addr(struct sk_buff *skb, struct genl_info *info) 1206 { 1207 struct nlattr *attr = info->attrs[MPTCP_PM_ATTR_ADDR]; 1208 struct pm_nl_pernet *pernet = genl_info_pm_nl(info); 1209 struct mptcp_pm_addr_entry addr, *entry; 1210 unsigned int addr_max; 1211 int ret; 1212 1213 ret = mptcp_pm_parse_addr(attr, info, false, &addr); 1214 if (ret < 0) 1215 return ret; 1216 1217 /* the zero id address is special: the first address used by the msk 1218 * always gets such an id, so different subflows can have different zero 1219 * id addresses. Additionally zero id is not accounted for in id_bitmap. 1220 * Let's use an 'mptcp_rm_list' instead of the common remove code. 1221 */ 1222 if (addr.addr.id == 0) 1223 return mptcp_nl_remove_id_zero_address(sock_net(skb->sk), &addr.addr); 1224 1225 spin_lock_bh(&pernet->lock); 1226 entry = __lookup_addr_by_id(pernet, addr.addr.id); 1227 if (!entry) { 1228 GENL_SET_ERR_MSG(info, "address not found"); 1229 spin_unlock_bh(&pernet->lock); 1230 return -EINVAL; 1231 } 1232 if (entry->flags & MPTCP_PM_ADDR_FLAG_SIGNAL) { 1233 addr_max = pernet->add_addr_signal_max; 1234 WRITE_ONCE(pernet->add_addr_signal_max, addr_max - 1); 1235 } 1236 if (entry->flags & MPTCP_PM_ADDR_FLAG_SUBFLOW) { 1237 addr_max = pernet->local_addr_max; 1238 WRITE_ONCE(pernet->local_addr_max, addr_max - 1); 1239 } 1240 1241 pernet->addrs--; 1242 list_del_rcu(&entry->list); 1243 __clear_bit(entry->addr.id, pernet->id_bitmap); 1244 spin_unlock_bh(&pernet->lock); 1245 1246 mptcp_nl_remove_subflow_and_signal_addr(sock_net(skb->sk), &entry->addr); 1247 mptcp_pm_free_addr_entry(entry); 1248 1249 return ret; 1250 } 1251 1252 static void mptcp_pm_remove_addrs_and_subflows(struct mptcp_sock *msk, 1253 struct list_head *rm_list) 1254 { 1255 struct mptcp_rm_list alist = { .nr = 0 }, slist = { .nr = 0 }; 1256 struct mptcp_pm_addr_entry *entry; 1257 1258 list_for_each_entry(entry, rm_list, list) { 1259 if (lookup_subflow_by_saddr(&msk->conn_list, &entry->addr) && 1260 alist.nr < MPTCP_RM_IDS_MAX && 1261 slist.nr < MPTCP_RM_IDS_MAX) { 1262 alist.ids[alist.nr++] = entry->addr.id; 1263 slist.ids[slist.nr++] = entry->addr.id; 1264 } else if (remove_anno_list_by_saddr(msk, &entry->addr) && 1265 alist.nr < MPTCP_RM_IDS_MAX) { 1266 alist.ids[alist.nr++] = entry->addr.id; 1267 } 1268 } 1269 1270 if (alist.nr) { 1271 spin_lock_bh(&msk->pm.lock); 1272 mptcp_pm_remove_addr(msk, &alist); 1273 spin_unlock_bh(&msk->pm.lock); 1274 } 1275 if (slist.nr) 1276 mptcp_pm_remove_subflow(msk, &slist); 1277 } 1278 1279 static void mptcp_nl_remove_addrs_list(struct net *net, 1280 struct list_head *rm_list) 1281 { 1282 long s_slot = 0, s_num = 0; 1283 struct mptcp_sock *msk; 1284 1285 if (list_empty(rm_list)) 1286 return; 1287 1288 while ((msk = mptcp_token_iter_next(net, &s_slot, &s_num)) != NULL) { 1289 struct sock *sk = (struct sock *)msk; 1290 1291 lock_sock(sk); 1292 mptcp_pm_remove_addrs_and_subflows(msk, rm_list); 1293 release_sock(sk); 1294 1295 sock_put(sk); 1296 cond_resched(); 1297 } 1298 } 1299 1300 static void __flush_addrs(struct list_head *list) 1301 { 1302 while (!list_empty(list)) { 1303 struct mptcp_pm_addr_entry *cur; 1304 1305 cur = list_entry(list->next, 1306 struct mptcp_pm_addr_entry, list); 1307 list_del_rcu(&cur->list); 1308 mptcp_pm_free_addr_entry(cur); 1309 } 1310 } 1311 1312 static void __reset_counters(struct pm_nl_pernet *pernet) 1313 { 1314 WRITE_ONCE(pernet->add_addr_signal_max, 0); 1315 WRITE_ONCE(pernet->add_addr_accept_max, 0); 1316 WRITE_ONCE(pernet->local_addr_max, 0); 1317 pernet->addrs = 0; 1318 } 1319 1320 static int mptcp_nl_cmd_flush_addrs(struct sk_buff *skb, struct genl_info *info) 1321 { 1322 struct pm_nl_pernet *pernet = genl_info_pm_nl(info); 1323 LIST_HEAD(free_list); 1324 1325 spin_lock_bh(&pernet->lock); 1326 list_splice_init(&pernet->local_addr_list, &free_list); 1327 __reset_counters(pernet); 1328 pernet->next_id = 1; 1329 bitmap_zero(pernet->id_bitmap, MAX_ADDR_ID + 1); 1330 spin_unlock_bh(&pernet->lock); 1331 mptcp_nl_remove_addrs_list(sock_net(skb->sk), &free_list); 1332 __flush_addrs(&free_list); 1333 return 0; 1334 } 1335 1336 static int mptcp_nl_fill_addr(struct sk_buff *skb, 1337 struct mptcp_pm_addr_entry *entry) 1338 { 1339 struct mptcp_addr_info *addr = &entry->addr; 1340 struct nlattr *attr; 1341 1342 attr = nla_nest_start(skb, MPTCP_PM_ATTR_ADDR); 1343 if (!attr) 1344 return -EMSGSIZE; 1345 1346 if (nla_put_u16(skb, MPTCP_PM_ADDR_ATTR_FAMILY, addr->family)) 1347 goto nla_put_failure; 1348 if (nla_put_u16(skb, MPTCP_PM_ADDR_ATTR_PORT, ntohs(addr->port))) 1349 goto nla_put_failure; 1350 if (nla_put_u8(skb, MPTCP_PM_ADDR_ATTR_ID, addr->id)) 1351 goto nla_put_failure; 1352 if (nla_put_u32(skb, MPTCP_PM_ADDR_ATTR_FLAGS, entry->flags)) 1353 goto nla_put_failure; 1354 if (entry->ifindex && 1355 nla_put_s32(skb, MPTCP_PM_ADDR_ATTR_IF_IDX, entry->ifindex)) 1356 goto nla_put_failure; 1357 1358 if (addr->family == AF_INET && 1359 nla_put_in_addr(skb, MPTCP_PM_ADDR_ATTR_ADDR4, 1360 addr->addr.s_addr)) 1361 goto nla_put_failure; 1362 #if IS_ENABLED(CONFIG_MPTCP_IPV6) 1363 else if (addr->family == AF_INET6 && 1364 nla_put_in6_addr(skb, MPTCP_PM_ADDR_ATTR_ADDR6, &addr->addr6)) 1365 goto nla_put_failure; 1366 #endif 1367 nla_nest_end(skb, attr); 1368 return 0; 1369 1370 nla_put_failure: 1371 nla_nest_cancel(skb, attr); 1372 return -EMSGSIZE; 1373 } 1374 1375 static int mptcp_nl_cmd_get_addr(struct sk_buff *skb, struct genl_info *info) 1376 { 1377 struct nlattr *attr = info->attrs[MPTCP_PM_ATTR_ADDR]; 1378 struct pm_nl_pernet *pernet = genl_info_pm_nl(info); 1379 struct mptcp_pm_addr_entry addr, *entry; 1380 struct sk_buff *msg; 1381 void *reply; 1382 int ret; 1383 1384 ret = mptcp_pm_parse_addr(attr, info, false, &addr); 1385 if (ret < 0) 1386 return ret; 1387 1388 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1389 if (!msg) 1390 return -ENOMEM; 1391 1392 reply = genlmsg_put_reply(msg, info, &mptcp_genl_family, 0, 1393 info->genlhdr->cmd); 1394 if (!reply) { 1395 GENL_SET_ERR_MSG(info, "not enough space in Netlink message"); 1396 ret = -EMSGSIZE; 1397 goto fail; 1398 } 1399 1400 spin_lock_bh(&pernet->lock); 1401 entry = __lookup_addr_by_id(pernet, addr.addr.id); 1402 if (!entry) { 1403 GENL_SET_ERR_MSG(info, "address not found"); 1404 ret = -EINVAL; 1405 goto unlock_fail; 1406 } 1407 1408 ret = mptcp_nl_fill_addr(msg, entry); 1409 if (ret) 1410 goto unlock_fail; 1411 1412 genlmsg_end(msg, reply); 1413 ret = genlmsg_reply(msg, info); 1414 spin_unlock_bh(&pernet->lock); 1415 return ret; 1416 1417 unlock_fail: 1418 spin_unlock_bh(&pernet->lock); 1419 1420 fail: 1421 nlmsg_free(msg); 1422 return ret; 1423 } 1424 1425 static int mptcp_nl_cmd_dump_addrs(struct sk_buff *msg, 1426 struct netlink_callback *cb) 1427 { 1428 struct net *net = sock_net(msg->sk); 1429 struct mptcp_pm_addr_entry *entry; 1430 struct pm_nl_pernet *pernet; 1431 int id = cb->args[0]; 1432 void *hdr; 1433 int i; 1434 1435 pernet = net_generic(net, pm_nl_pernet_id); 1436 1437 spin_lock_bh(&pernet->lock); 1438 for (i = id; i < MAX_ADDR_ID + 1; i++) { 1439 if (test_bit(i, pernet->id_bitmap)) { 1440 entry = __lookup_addr_by_id(pernet, i); 1441 if (!entry) 1442 break; 1443 1444 if (entry->addr.id <= id) 1445 continue; 1446 1447 hdr = genlmsg_put(msg, NETLINK_CB(cb->skb).portid, 1448 cb->nlh->nlmsg_seq, &mptcp_genl_family, 1449 NLM_F_MULTI, MPTCP_PM_CMD_GET_ADDR); 1450 if (!hdr) 1451 break; 1452 1453 if (mptcp_nl_fill_addr(msg, entry) < 0) { 1454 genlmsg_cancel(msg, hdr); 1455 break; 1456 } 1457 1458 id = entry->addr.id; 1459 genlmsg_end(msg, hdr); 1460 } 1461 } 1462 spin_unlock_bh(&pernet->lock); 1463 1464 cb->args[0] = id; 1465 return msg->len; 1466 } 1467 1468 static int parse_limit(struct genl_info *info, int id, unsigned int *limit) 1469 { 1470 struct nlattr *attr = info->attrs[id]; 1471 1472 if (!attr) 1473 return 0; 1474 1475 *limit = nla_get_u32(attr); 1476 if (*limit > MPTCP_PM_ADDR_MAX) { 1477 GENL_SET_ERR_MSG(info, "limit greater than maximum"); 1478 return -EINVAL; 1479 } 1480 return 0; 1481 } 1482 1483 static int 1484 mptcp_nl_cmd_set_limits(struct sk_buff *skb, struct genl_info *info) 1485 { 1486 struct pm_nl_pernet *pernet = genl_info_pm_nl(info); 1487 unsigned int rcv_addrs, subflows; 1488 int ret; 1489 1490 spin_lock_bh(&pernet->lock); 1491 rcv_addrs = pernet->add_addr_accept_max; 1492 ret = parse_limit(info, MPTCP_PM_ATTR_RCV_ADD_ADDRS, &rcv_addrs); 1493 if (ret) 1494 goto unlock; 1495 1496 subflows = pernet->subflows_max; 1497 ret = parse_limit(info, MPTCP_PM_ATTR_SUBFLOWS, &subflows); 1498 if (ret) 1499 goto unlock; 1500 1501 WRITE_ONCE(pernet->add_addr_accept_max, rcv_addrs); 1502 WRITE_ONCE(pernet->subflows_max, subflows); 1503 1504 unlock: 1505 spin_unlock_bh(&pernet->lock); 1506 return ret; 1507 } 1508 1509 static int 1510 mptcp_nl_cmd_get_limits(struct sk_buff *skb, struct genl_info *info) 1511 { 1512 struct pm_nl_pernet *pernet = genl_info_pm_nl(info); 1513 struct sk_buff *msg; 1514 void *reply; 1515 1516 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1517 if (!msg) 1518 return -ENOMEM; 1519 1520 reply = genlmsg_put_reply(msg, info, &mptcp_genl_family, 0, 1521 MPTCP_PM_CMD_GET_LIMITS); 1522 if (!reply) 1523 goto fail; 1524 1525 if (nla_put_u32(msg, MPTCP_PM_ATTR_RCV_ADD_ADDRS, 1526 READ_ONCE(pernet->add_addr_accept_max))) 1527 goto fail; 1528 1529 if (nla_put_u32(msg, MPTCP_PM_ATTR_SUBFLOWS, 1530 READ_ONCE(pernet->subflows_max))) 1531 goto fail; 1532 1533 genlmsg_end(msg, reply); 1534 return genlmsg_reply(msg, info); 1535 1536 fail: 1537 GENL_SET_ERR_MSG(info, "not enough space in Netlink message"); 1538 nlmsg_free(msg); 1539 return -EMSGSIZE; 1540 } 1541 1542 static int mptcp_nl_addr_backup(struct net *net, 1543 struct mptcp_addr_info *addr, 1544 u8 bkup) 1545 { 1546 long s_slot = 0, s_num = 0; 1547 struct mptcp_sock *msk; 1548 int ret = -EINVAL; 1549 1550 while ((msk = mptcp_token_iter_next(net, &s_slot, &s_num)) != NULL) { 1551 struct sock *sk = (struct sock *)msk; 1552 1553 if (list_empty(&msk->conn_list)) 1554 goto next; 1555 1556 lock_sock(sk); 1557 spin_lock_bh(&msk->pm.lock); 1558 ret = mptcp_pm_nl_mp_prio_send_ack(msk, addr, bkup); 1559 spin_unlock_bh(&msk->pm.lock); 1560 release_sock(sk); 1561 1562 next: 1563 sock_put(sk); 1564 cond_resched(); 1565 } 1566 1567 return ret; 1568 } 1569 1570 static int mptcp_nl_cmd_set_flags(struct sk_buff *skb, struct genl_info *info) 1571 { 1572 struct nlattr *attr = info->attrs[MPTCP_PM_ATTR_ADDR]; 1573 struct pm_nl_pernet *pernet = genl_info_pm_nl(info); 1574 struct mptcp_pm_addr_entry addr, *entry; 1575 struct net *net = sock_net(skb->sk); 1576 u8 bkup = 0; 1577 int ret; 1578 1579 ret = mptcp_pm_parse_addr(attr, info, true, &addr); 1580 if (ret < 0) 1581 return ret; 1582 1583 if (addr.flags & MPTCP_PM_ADDR_FLAG_BACKUP) 1584 bkup = 1; 1585 1586 list_for_each_entry(entry, &pernet->local_addr_list, list) { 1587 if (addresses_equal(&entry->addr, &addr.addr, true)) { 1588 ret = mptcp_nl_addr_backup(net, &entry->addr, bkup); 1589 if (ret) 1590 return ret; 1591 1592 if (bkup) 1593 entry->flags |= MPTCP_PM_ADDR_FLAG_BACKUP; 1594 else 1595 entry->flags &= ~MPTCP_PM_ADDR_FLAG_BACKUP; 1596 } 1597 } 1598 1599 return 0; 1600 } 1601 1602 static void mptcp_nl_mcast_send(struct net *net, struct sk_buff *nlskb, gfp_t gfp) 1603 { 1604 genlmsg_multicast_netns(&mptcp_genl_family, net, 1605 nlskb, 0, MPTCP_PM_EV_GRP_OFFSET, gfp); 1606 } 1607 1608 static int mptcp_event_add_subflow(struct sk_buff *skb, const struct sock *ssk) 1609 { 1610 const struct inet_sock *issk = inet_sk(ssk); 1611 const struct mptcp_subflow_context *sf; 1612 1613 if (nla_put_u16(skb, MPTCP_ATTR_FAMILY, ssk->sk_family)) 1614 return -EMSGSIZE; 1615 1616 switch (ssk->sk_family) { 1617 case AF_INET: 1618 if (nla_put_in_addr(skb, MPTCP_ATTR_SADDR4, issk->inet_saddr)) 1619 return -EMSGSIZE; 1620 if (nla_put_in_addr(skb, MPTCP_ATTR_DADDR4, issk->inet_daddr)) 1621 return -EMSGSIZE; 1622 break; 1623 #if IS_ENABLED(CONFIG_MPTCP_IPV6) 1624 case AF_INET6: { 1625 const struct ipv6_pinfo *np = inet6_sk(ssk); 1626 1627 if (nla_put_in6_addr(skb, MPTCP_ATTR_SADDR6, &np->saddr)) 1628 return -EMSGSIZE; 1629 if (nla_put_in6_addr(skb, MPTCP_ATTR_DADDR6, &ssk->sk_v6_daddr)) 1630 return -EMSGSIZE; 1631 break; 1632 } 1633 #endif 1634 default: 1635 WARN_ON_ONCE(1); 1636 return -EMSGSIZE; 1637 } 1638 1639 if (nla_put_be16(skb, MPTCP_ATTR_SPORT, issk->inet_sport)) 1640 return -EMSGSIZE; 1641 if (nla_put_be16(skb, MPTCP_ATTR_DPORT, issk->inet_dport)) 1642 return -EMSGSIZE; 1643 1644 sf = mptcp_subflow_ctx(ssk); 1645 if (WARN_ON_ONCE(!sf)) 1646 return -EINVAL; 1647 1648 if (nla_put_u8(skb, MPTCP_ATTR_LOC_ID, sf->local_id)) 1649 return -EMSGSIZE; 1650 1651 if (nla_put_u8(skb, MPTCP_ATTR_REM_ID, sf->remote_id)) 1652 return -EMSGSIZE; 1653 1654 return 0; 1655 } 1656 1657 static int mptcp_event_put_token_and_ssk(struct sk_buff *skb, 1658 const struct mptcp_sock *msk, 1659 const struct sock *ssk) 1660 { 1661 const struct sock *sk = (const struct sock *)msk; 1662 const struct mptcp_subflow_context *sf; 1663 u8 sk_err; 1664 1665 if (nla_put_u32(skb, MPTCP_ATTR_TOKEN, msk->token)) 1666 return -EMSGSIZE; 1667 1668 if (mptcp_event_add_subflow(skb, ssk)) 1669 return -EMSGSIZE; 1670 1671 sf = mptcp_subflow_ctx(ssk); 1672 if (WARN_ON_ONCE(!sf)) 1673 return -EINVAL; 1674 1675 if (nla_put_u8(skb, MPTCP_ATTR_BACKUP, sf->backup)) 1676 return -EMSGSIZE; 1677 1678 if (ssk->sk_bound_dev_if && 1679 nla_put_s32(skb, MPTCP_ATTR_IF_IDX, ssk->sk_bound_dev_if)) 1680 return -EMSGSIZE; 1681 1682 sk_err = ssk->sk_err; 1683 if (sk_err && sk->sk_state == TCP_ESTABLISHED && 1684 nla_put_u8(skb, MPTCP_ATTR_ERROR, sk_err)) 1685 return -EMSGSIZE; 1686 1687 return 0; 1688 } 1689 1690 static int mptcp_event_sub_established(struct sk_buff *skb, 1691 const struct mptcp_sock *msk, 1692 const struct sock *ssk) 1693 { 1694 return mptcp_event_put_token_and_ssk(skb, msk, ssk); 1695 } 1696 1697 static int mptcp_event_sub_closed(struct sk_buff *skb, 1698 const struct mptcp_sock *msk, 1699 const struct sock *ssk) 1700 { 1701 const struct mptcp_subflow_context *sf; 1702 1703 if (mptcp_event_put_token_and_ssk(skb, msk, ssk)) 1704 return -EMSGSIZE; 1705 1706 sf = mptcp_subflow_ctx(ssk); 1707 if (!sf->reset_seen) 1708 return 0; 1709 1710 if (nla_put_u32(skb, MPTCP_ATTR_RESET_REASON, sf->reset_reason)) 1711 return -EMSGSIZE; 1712 1713 if (nla_put_u32(skb, MPTCP_ATTR_RESET_FLAGS, sf->reset_transient)) 1714 return -EMSGSIZE; 1715 1716 return 0; 1717 } 1718 1719 static int mptcp_event_created(struct sk_buff *skb, 1720 const struct mptcp_sock *msk, 1721 const struct sock *ssk) 1722 { 1723 int err = nla_put_u32(skb, MPTCP_ATTR_TOKEN, msk->token); 1724 1725 if (err) 1726 return err; 1727 1728 return mptcp_event_add_subflow(skb, ssk); 1729 } 1730 1731 void mptcp_event_addr_removed(const struct mptcp_sock *msk, uint8_t id) 1732 { 1733 struct net *net = sock_net((const struct sock *)msk); 1734 struct nlmsghdr *nlh; 1735 struct sk_buff *skb; 1736 1737 if (!genl_has_listeners(&mptcp_genl_family, net, MPTCP_PM_EV_GRP_OFFSET)) 1738 return; 1739 1740 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 1741 if (!skb) 1742 return; 1743 1744 nlh = genlmsg_put(skb, 0, 0, &mptcp_genl_family, 0, MPTCP_EVENT_REMOVED); 1745 if (!nlh) 1746 goto nla_put_failure; 1747 1748 if (nla_put_u32(skb, MPTCP_ATTR_TOKEN, msk->token)) 1749 goto nla_put_failure; 1750 1751 if (nla_put_u8(skb, MPTCP_ATTR_REM_ID, id)) 1752 goto nla_put_failure; 1753 1754 genlmsg_end(skb, nlh); 1755 mptcp_nl_mcast_send(net, skb, GFP_ATOMIC); 1756 return; 1757 1758 nla_put_failure: 1759 kfree_skb(skb); 1760 } 1761 1762 void mptcp_event_addr_announced(const struct mptcp_sock *msk, 1763 const struct mptcp_addr_info *info) 1764 { 1765 struct net *net = sock_net((const struct sock *)msk); 1766 struct nlmsghdr *nlh; 1767 struct sk_buff *skb; 1768 1769 if (!genl_has_listeners(&mptcp_genl_family, net, MPTCP_PM_EV_GRP_OFFSET)) 1770 return; 1771 1772 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 1773 if (!skb) 1774 return; 1775 1776 nlh = genlmsg_put(skb, 0, 0, &mptcp_genl_family, 0, 1777 MPTCP_EVENT_ANNOUNCED); 1778 if (!nlh) 1779 goto nla_put_failure; 1780 1781 if (nla_put_u32(skb, MPTCP_ATTR_TOKEN, msk->token)) 1782 goto nla_put_failure; 1783 1784 if (nla_put_u8(skb, MPTCP_ATTR_REM_ID, info->id)) 1785 goto nla_put_failure; 1786 1787 if (nla_put_be16(skb, MPTCP_ATTR_DPORT, info->port)) 1788 goto nla_put_failure; 1789 1790 switch (info->family) { 1791 case AF_INET: 1792 if (nla_put_in_addr(skb, MPTCP_ATTR_DADDR4, info->addr.s_addr)) 1793 goto nla_put_failure; 1794 break; 1795 #if IS_ENABLED(CONFIG_MPTCP_IPV6) 1796 case AF_INET6: 1797 if (nla_put_in6_addr(skb, MPTCP_ATTR_DADDR6, &info->addr6)) 1798 goto nla_put_failure; 1799 break; 1800 #endif 1801 default: 1802 WARN_ON_ONCE(1); 1803 goto nla_put_failure; 1804 } 1805 1806 genlmsg_end(skb, nlh); 1807 mptcp_nl_mcast_send(net, skb, GFP_ATOMIC); 1808 return; 1809 1810 nla_put_failure: 1811 kfree_skb(skb); 1812 } 1813 1814 void mptcp_event(enum mptcp_event_type type, const struct mptcp_sock *msk, 1815 const struct sock *ssk, gfp_t gfp) 1816 { 1817 struct net *net = sock_net((const struct sock *)msk); 1818 struct nlmsghdr *nlh; 1819 struct sk_buff *skb; 1820 1821 if (!genl_has_listeners(&mptcp_genl_family, net, MPTCP_PM_EV_GRP_OFFSET)) 1822 return; 1823 1824 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, gfp); 1825 if (!skb) 1826 return; 1827 1828 nlh = genlmsg_put(skb, 0, 0, &mptcp_genl_family, 0, type); 1829 if (!nlh) 1830 goto nla_put_failure; 1831 1832 switch (type) { 1833 case MPTCP_EVENT_UNSPEC: 1834 WARN_ON_ONCE(1); 1835 break; 1836 case MPTCP_EVENT_CREATED: 1837 case MPTCP_EVENT_ESTABLISHED: 1838 if (mptcp_event_created(skb, msk, ssk) < 0) 1839 goto nla_put_failure; 1840 break; 1841 case MPTCP_EVENT_CLOSED: 1842 if (nla_put_u32(skb, MPTCP_ATTR_TOKEN, msk->token) < 0) 1843 goto nla_put_failure; 1844 break; 1845 case MPTCP_EVENT_ANNOUNCED: 1846 case MPTCP_EVENT_REMOVED: 1847 /* call mptcp_event_addr_announced()/removed instead */ 1848 WARN_ON_ONCE(1); 1849 break; 1850 case MPTCP_EVENT_SUB_ESTABLISHED: 1851 case MPTCP_EVENT_SUB_PRIORITY: 1852 if (mptcp_event_sub_established(skb, msk, ssk) < 0) 1853 goto nla_put_failure; 1854 break; 1855 case MPTCP_EVENT_SUB_CLOSED: 1856 if (mptcp_event_sub_closed(skb, msk, ssk) < 0) 1857 goto nla_put_failure; 1858 break; 1859 } 1860 1861 genlmsg_end(skb, nlh); 1862 mptcp_nl_mcast_send(net, skb, gfp); 1863 return; 1864 1865 nla_put_failure: 1866 kfree_skb(skb); 1867 } 1868 1869 static const struct genl_small_ops mptcp_pm_ops[] = { 1870 { 1871 .cmd = MPTCP_PM_CMD_ADD_ADDR, 1872 .doit = mptcp_nl_cmd_add_addr, 1873 .flags = GENL_ADMIN_PERM, 1874 }, 1875 { 1876 .cmd = MPTCP_PM_CMD_DEL_ADDR, 1877 .doit = mptcp_nl_cmd_del_addr, 1878 .flags = GENL_ADMIN_PERM, 1879 }, 1880 { 1881 .cmd = MPTCP_PM_CMD_FLUSH_ADDRS, 1882 .doit = mptcp_nl_cmd_flush_addrs, 1883 .flags = GENL_ADMIN_PERM, 1884 }, 1885 { 1886 .cmd = MPTCP_PM_CMD_GET_ADDR, 1887 .doit = mptcp_nl_cmd_get_addr, 1888 .dumpit = mptcp_nl_cmd_dump_addrs, 1889 }, 1890 { 1891 .cmd = MPTCP_PM_CMD_SET_LIMITS, 1892 .doit = mptcp_nl_cmd_set_limits, 1893 .flags = GENL_ADMIN_PERM, 1894 }, 1895 { 1896 .cmd = MPTCP_PM_CMD_GET_LIMITS, 1897 .doit = mptcp_nl_cmd_get_limits, 1898 }, 1899 { 1900 .cmd = MPTCP_PM_CMD_SET_FLAGS, 1901 .doit = mptcp_nl_cmd_set_flags, 1902 .flags = GENL_ADMIN_PERM, 1903 }, 1904 }; 1905 1906 static struct genl_family mptcp_genl_family __ro_after_init = { 1907 .name = MPTCP_PM_NAME, 1908 .version = MPTCP_PM_VER, 1909 .maxattr = MPTCP_PM_ATTR_MAX, 1910 .policy = mptcp_pm_policy, 1911 .netnsok = true, 1912 .module = THIS_MODULE, 1913 .small_ops = mptcp_pm_ops, 1914 .n_small_ops = ARRAY_SIZE(mptcp_pm_ops), 1915 .mcgrps = mptcp_pm_mcgrps, 1916 .n_mcgrps = ARRAY_SIZE(mptcp_pm_mcgrps), 1917 }; 1918 1919 static int __net_init pm_nl_init_net(struct net *net) 1920 { 1921 struct pm_nl_pernet *pernet = net_generic(net, pm_nl_pernet_id); 1922 1923 INIT_LIST_HEAD_RCU(&pernet->local_addr_list); 1924 pernet->next_id = 1; 1925 spin_lock_init(&pernet->lock); 1926 1927 /* No need to initialize other pernet fields, the struct is zeroed at 1928 * allocation time. 1929 */ 1930 1931 return 0; 1932 } 1933 1934 static void __net_exit pm_nl_exit_net(struct list_head *net_list) 1935 { 1936 struct net *net; 1937 1938 list_for_each_entry(net, net_list, exit_list) { 1939 struct pm_nl_pernet *pernet = net_generic(net, pm_nl_pernet_id); 1940 1941 /* net is removed from namespace list, can't race with 1942 * other modifiers 1943 */ 1944 __flush_addrs(&pernet->local_addr_list); 1945 } 1946 } 1947 1948 static struct pernet_operations mptcp_pm_pernet_ops = { 1949 .init = pm_nl_init_net, 1950 .exit_batch = pm_nl_exit_net, 1951 .id = &pm_nl_pernet_id, 1952 .size = sizeof(struct pm_nl_pernet), 1953 }; 1954 1955 void __init mptcp_pm_nl_init(void) 1956 { 1957 if (register_pernet_subsys(&mptcp_pm_pernet_ops) < 0) 1958 panic("Failed to register MPTCP PM pernet subsystem.\n"); 1959 1960 if (genl_register_family(&mptcp_genl_family)) 1961 panic("Failed to register MPTCP PM netlink family\n"); 1962 } 1963