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/inet_common.h> 13 #include <net/netns/generic.h> 14 #include <net/mptcp.h> 15 #include <net/genetlink.h> 16 #include <uapi/linux/mptcp.h> 17 18 #include "protocol.h" 19 #include "mib.h" 20 21 /* forward declaration */ 22 static struct genl_family mptcp_genl_family; 23 24 static int pm_nl_pernet_id; 25 26 struct mptcp_pm_add_entry { 27 struct list_head list; 28 struct mptcp_addr_info addr; 29 u8 retrans_times; 30 struct timer_list add_timer; 31 struct mptcp_sock *sock; 32 }; 33 34 struct pm_nl_pernet { 35 /* protects pernet updates */ 36 spinlock_t lock; 37 struct list_head local_addr_list; 38 unsigned int addrs; 39 unsigned int stale_loss_cnt; 40 unsigned int add_addr_signal_max; 41 unsigned int add_addr_accept_max; 42 unsigned int local_addr_max; 43 unsigned int subflows_max; 44 unsigned int next_id; 45 DECLARE_BITMAP(id_bitmap, MPTCP_PM_MAX_ADDR_ID + 1); 46 }; 47 48 #define MPTCP_PM_ADDR_MAX 8 49 #define ADD_ADDR_RETRANS_MAX 3 50 51 static struct pm_nl_pernet *pm_nl_get_pernet(const struct net *net) 52 { 53 return net_generic(net, pm_nl_pernet_id); 54 } 55 56 static struct pm_nl_pernet * 57 pm_nl_get_pernet_from_msk(const struct mptcp_sock *msk) 58 { 59 return pm_nl_get_pernet(sock_net((struct sock *)msk)); 60 } 61 62 bool mptcp_addresses_equal(const struct mptcp_addr_info *a, 63 const struct mptcp_addr_info *b, bool use_port) 64 { 65 bool addr_equals = false; 66 67 if (a->family == b->family) { 68 if (a->family == AF_INET) 69 addr_equals = a->addr.s_addr == b->addr.s_addr; 70 #if IS_ENABLED(CONFIG_MPTCP_IPV6) 71 else 72 addr_equals = !ipv6_addr_cmp(&a->addr6, &b->addr6); 73 } else if (a->family == AF_INET) { 74 if (ipv6_addr_v4mapped(&b->addr6)) 75 addr_equals = a->addr.s_addr == b->addr6.s6_addr32[3]; 76 } else if (b->family == AF_INET) { 77 if (ipv6_addr_v4mapped(&a->addr6)) 78 addr_equals = a->addr6.s6_addr32[3] == b->addr.s_addr; 79 #endif 80 } 81 82 if (!addr_equals) 83 return false; 84 if (!use_port) 85 return true; 86 87 return a->port == b->port; 88 } 89 90 void mptcp_local_address(const struct sock_common *skc, struct mptcp_addr_info *addr) 91 { 92 addr->family = skc->skc_family; 93 addr->port = htons(skc->skc_num); 94 if (addr->family == AF_INET) 95 addr->addr.s_addr = skc->skc_rcv_saddr; 96 #if IS_ENABLED(CONFIG_MPTCP_IPV6) 97 else if (addr->family == AF_INET6) 98 addr->addr6 = skc->skc_v6_rcv_saddr; 99 #endif 100 } 101 102 static void remote_address(const struct sock_common *skc, 103 struct mptcp_addr_info *addr) 104 { 105 addr->family = skc->skc_family; 106 addr->port = skc->skc_dport; 107 if (addr->family == AF_INET) 108 addr->addr.s_addr = skc->skc_daddr; 109 #if IS_ENABLED(CONFIG_MPTCP_IPV6) 110 else if (addr->family == AF_INET6) 111 addr->addr6 = skc->skc_v6_daddr; 112 #endif 113 } 114 115 static bool lookup_subflow_by_saddr(const struct list_head *list, 116 const struct mptcp_addr_info *saddr) 117 { 118 struct mptcp_subflow_context *subflow; 119 struct mptcp_addr_info cur; 120 struct sock_common *skc; 121 122 list_for_each_entry(subflow, list, node) { 123 skc = (struct sock_common *)mptcp_subflow_tcp_sock(subflow); 124 125 mptcp_local_address(skc, &cur); 126 if (mptcp_addresses_equal(&cur, saddr, saddr->port)) 127 return true; 128 } 129 130 return false; 131 } 132 133 static bool lookup_subflow_by_daddr(const struct list_head *list, 134 const struct mptcp_addr_info *daddr) 135 { 136 struct mptcp_subflow_context *subflow; 137 struct mptcp_addr_info cur; 138 139 list_for_each_entry(subflow, list, node) { 140 struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 141 142 if (!((1 << inet_sk_state_load(ssk)) & 143 (TCPF_ESTABLISHED | TCPF_SYN_SENT | TCPF_SYN_RECV))) 144 continue; 145 146 remote_address((struct sock_common *)ssk, &cur); 147 if (mptcp_addresses_equal(&cur, daddr, daddr->port)) 148 return true; 149 } 150 151 return false; 152 } 153 154 static bool 155 select_local_address(const struct pm_nl_pernet *pernet, 156 const struct mptcp_sock *msk, 157 struct mptcp_pm_addr_entry *new_entry) 158 { 159 struct mptcp_pm_addr_entry *entry; 160 bool found = false; 161 162 msk_owned_by_me(msk); 163 164 rcu_read_lock(); 165 list_for_each_entry_rcu(entry, &pernet->local_addr_list, list) { 166 if (!(entry->flags & MPTCP_PM_ADDR_FLAG_SUBFLOW)) 167 continue; 168 169 if (!test_bit(entry->addr.id, msk->pm.id_avail_bitmap)) 170 continue; 171 172 *new_entry = *entry; 173 found = true; 174 break; 175 } 176 rcu_read_unlock(); 177 178 return found; 179 } 180 181 static bool 182 select_signal_address(struct pm_nl_pernet *pernet, const struct mptcp_sock *msk, 183 struct mptcp_pm_addr_entry *new_entry) 184 { 185 struct mptcp_pm_addr_entry *entry; 186 bool found = false; 187 188 rcu_read_lock(); 189 /* do not keep any additional per socket state, just signal 190 * the address list in order. 191 * Note: removal from the local address list during the msk life-cycle 192 * can lead to additional addresses not being announced. 193 */ 194 list_for_each_entry_rcu(entry, &pernet->local_addr_list, list) { 195 if (!test_bit(entry->addr.id, msk->pm.id_avail_bitmap)) 196 continue; 197 198 if (!(entry->flags & MPTCP_PM_ADDR_FLAG_SIGNAL)) 199 continue; 200 201 *new_entry = *entry; 202 found = true; 203 break; 204 } 205 rcu_read_unlock(); 206 207 return found; 208 } 209 210 unsigned int mptcp_pm_get_add_addr_signal_max(const struct mptcp_sock *msk) 211 { 212 const struct pm_nl_pernet *pernet = pm_nl_get_pernet_from_msk(msk); 213 214 return READ_ONCE(pernet->add_addr_signal_max); 215 } 216 EXPORT_SYMBOL_GPL(mptcp_pm_get_add_addr_signal_max); 217 218 unsigned int mptcp_pm_get_add_addr_accept_max(const struct mptcp_sock *msk) 219 { 220 struct pm_nl_pernet *pernet = pm_nl_get_pernet_from_msk(msk); 221 222 return READ_ONCE(pernet->add_addr_accept_max); 223 } 224 EXPORT_SYMBOL_GPL(mptcp_pm_get_add_addr_accept_max); 225 226 unsigned int mptcp_pm_get_subflows_max(const struct mptcp_sock *msk) 227 { 228 struct pm_nl_pernet *pernet = pm_nl_get_pernet_from_msk(msk); 229 230 return READ_ONCE(pernet->subflows_max); 231 } 232 EXPORT_SYMBOL_GPL(mptcp_pm_get_subflows_max); 233 234 unsigned int mptcp_pm_get_local_addr_max(const struct mptcp_sock *msk) 235 { 236 struct pm_nl_pernet *pernet = pm_nl_get_pernet_from_msk(msk); 237 238 return READ_ONCE(pernet->local_addr_max); 239 } 240 EXPORT_SYMBOL_GPL(mptcp_pm_get_local_addr_max); 241 242 bool mptcp_pm_nl_check_work_pending(struct mptcp_sock *msk) 243 { 244 struct pm_nl_pernet *pernet = pm_nl_get_pernet_from_msk(msk); 245 246 if (msk->pm.subflows == mptcp_pm_get_subflows_max(msk) || 247 (find_next_and_bit(pernet->id_bitmap, msk->pm.id_avail_bitmap, 248 MPTCP_PM_MAX_ADDR_ID + 1, 0) == MPTCP_PM_MAX_ADDR_ID + 1)) { 249 WRITE_ONCE(msk->pm.work_pending, false); 250 return false; 251 } 252 return true; 253 } 254 255 struct mptcp_pm_add_entry * 256 mptcp_lookup_anno_list_by_saddr(const struct mptcp_sock *msk, 257 const struct mptcp_addr_info *addr) 258 { 259 struct mptcp_pm_add_entry *entry; 260 261 lockdep_assert_held(&msk->pm.lock); 262 263 list_for_each_entry(entry, &msk->pm.anno_list, list) { 264 if (mptcp_addresses_equal(&entry->addr, addr, true)) 265 return entry; 266 } 267 268 return NULL; 269 } 270 271 bool mptcp_pm_sport_in_anno_list(struct mptcp_sock *msk, const struct sock *sk) 272 { 273 struct mptcp_pm_add_entry *entry; 274 struct mptcp_addr_info saddr; 275 bool ret = false; 276 277 mptcp_local_address((struct sock_common *)sk, &saddr); 278 279 spin_lock_bh(&msk->pm.lock); 280 list_for_each_entry(entry, &msk->pm.anno_list, list) { 281 if (mptcp_addresses_equal(&entry->addr, &saddr, true)) { 282 ret = true; 283 goto out; 284 } 285 } 286 287 out: 288 spin_unlock_bh(&msk->pm.lock); 289 return ret; 290 } 291 292 static void mptcp_pm_add_timer(struct timer_list *timer) 293 { 294 struct mptcp_pm_add_entry *entry = from_timer(entry, timer, add_timer); 295 struct mptcp_sock *msk = entry->sock; 296 struct sock *sk = (struct sock *)msk; 297 298 pr_debug("msk=%p\n", msk); 299 300 if (!msk) 301 return; 302 303 if (inet_sk_state_load(sk) == TCP_CLOSE) 304 return; 305 306 if (!entry->addr.id) 307 return; 308 309 if (mptcp_pm_should_add_signal_addr(msk)) { 310 sk_reset_timer(sk, timer, jiffies + TCP_RTO_MAX / 8); 311 goto out; 312 } 313 314 spin_lock_bh(&msk->pm.lock); 315 316 if (!mptcp_pm_should_add_signal_addr(msk)) { 317 pr_debug("retransmit ADD_ADDR id=%d\n", entry->addr.id); 318 mptcp_pm_announce_addr(msk, &entry->addr, false); 319 mptcp_pm_add_addr_send_ack(msk); 320 entry->retrans_times++; 321 } 322 323 if (entry->retrans_times < ADD_ADDR_RETRANS_MAX) 324 sk_reset_timer(sk, timer, 325 jiffies + mptcp_get_add_addr_timeout(sock_net(sk))); 326 327 spin_unlock_bh(&msk->pm.lock); 328 329 if (entry->retrans_times == ADD_ADDR_RETRANS_MAX) 330 mptcp_pm_subflow_established(msk); 331 332 out: 333 __sock_put(sk); 334 } 335 336 struct mptcp_pm_add_entry * 337 mptcp_pm_del_add_timer(struct mptcp_sock *msk, 338 const struct mptcp_addr_info *addr, bool check_id) 339 { 340 struct mptcp_pm_add_entry *entry; 341 struct sock *sk = (struct sock *)msk; 342 struct timer_list *add_timer = NULL; 343 344 spin_lock_bh(&msk->pm.lock); 345 entry = mptcp_lookup_anno_list_by_saddr(msk, addr); 346 if (entry && (!check_id || entry->addr.id == addr->id)) { 347 entry->retrans_times = ADD_ADDR_RETRANS_MAX; 348 add_timer = &entry->add_timer; 349 } 350 if (!check_id && entry) 351 list_del(&entry->list); 352 spin_unlock_bh(&msk->pm.lock); 353 354 /* no lock, because sk_stop_timer_sync() is calling del_timer_sync() */ 355 if (add_timer) 356 sk_stop_timer_sync(sk, add_timer); 357 358 return entry; 359 } 360 361 bool mptcp_pm_alloc_anno_list(struct mptcp_sock *msk, 362 const struct mptcp_addr_info *addr) 363 { 364 struct mptcp_pm_add_entry *add_entry = NULL; 365 struct sock *sk = (struct sock *)msk; 366 struct net *net = sock_net(sk); 367 368 lockdep_assert_held(&msk->pm.lock); 369 370 add_entry = mptcp_lookup_anno_list_by_saddr(msk, addr); 371 372 if (add_entry) { 373 if (WARN_ON_ONCE(mptcp_pm_is_kernel(msk))) 374 return false; 375 376 sk_reset_timer(sk, &add_entry->add_timer, 377 jiffies + mptcp_get_add_addr_timeout(net)); 378 return true; 379 } 380 381 add_entry = kmalloc(sizeof(*add_entry), GFP_ATOMIC); 382 if (!add_entry) 383 return false; 384 385 list_add(&add_entry->list, &msk->pm.anno_list); 386 387 add_entry->addr = *addr; 388 add_entry->sock = msk; 389 add_entry->retrans_times = 0; 390 391 timer_setup(&add_entry->add_timer, mptcp_pm_add_timer, 0); 392 sk_reset_timer(sk, &add_entry->add_timer, 393 jiffies + mptcp_get_add_addr_timeout(net)); 394 395 return true; 396 } 397 398 void mptcp_pm_free_anno_list(struct mptcp_sock *msk) 399 { 400 struct mptcp_pm_add_entry *entry, *tmp; 401 struct sock *sk = (struct sock *)msk; 402 LIST_HEAD(free_list); 403 404 pr_debug("msk=%p\n", msk); 405 406 spin_lock_bh(&msk->pm.lock); 407 list_splice_init(&msk->pm.anno_list, &free_list); 408 spin_unlock_bh(&msk->pm.lock); 409 410 list_for_each_entry_safe(entry, tmp, &free_list, list) { 411 sk_stop_timer_sync(sk, &entry->add_timer); 412 kfree(entry); 413 } 414 } 415 416 /* Fill all the remote addresses into the array addrs[], 417 * and return the array size. 418 */ 419 static unsigned int fill_remote_addresses_vec(struct mptcp_sock *msk, 420 struct mptcp_addr_info *local, 421 bool fullmesh, 422 struct mptcp_addr_info *addrs) 423 { 424 bool deny_id0 = READ_ONCE(msk->pm.remote_deny_join_id0); 425 struct sock *sk = (struct sock *)msk, *ssk; 426 struct mptcp_subflow_context *subflow; 427 struct mptcp_addr_info remote = { 0 }; 428 unsigned int subflows_max; 429 int i = 0; 430 431 subflows_max = mptcp_pm_get_subflows_max(msk); 432 remote_address((struct sock_common *)sk, &remote); 433 434 /* Non-fullmesh endpoint, fill in the single entry 435 * corresponding to the primary MPC subflow remote address 436 */ 437 if (!fullmesh) { 438 if (deny_id0) 439 return 0; 440 441 if (!mptcp_pm_addr_families_match(sk, local, &remote)) 442 return 0; 443 444 msk->pm.subflows++; 445 addrs[i++] = remote; 446 } else { 447 DECLARE_BITMAP(unavail_id, MPTCP_PM_MAX_ADDR_ID + 1); 448 449 /* Forbid creation of new subflows matching existing 450 * ones, possibly already created by incoming ADD_ADDR 451 */ 452 bitmap_zero(unavail_id, MPTCP_PM_MAX_ADDR_ID + 1); 453 mptcp_for_each_subflow(msk, subflow) 454 if (READ_ONCE(subflow->local_id) == local->id) 455 __set_bit(subflow->remote_id, unavail_id); 456 457 mptcp_for_each_subflow(msk, subflow) { 458 ssk = mptcp_subflow_tcp_sock(subflow); 459 remote_address((struct sock_common *)ssk, &addrs[i]); 460 addrs[i].id = READ_ONCE(subflow->remote_id); 461 if (deny_id0 && !addrs[i].id) 462 continue; 463 464 if (test_bit(addrs[i].id, unavail_id)) 465 continue; 466 467 if (!mptcp_pm_addr_families_match(sk, local, &addrs[i])) 468 continue; 469 470 if (msk->pm.subflows < subflows_max) { 471 /* forbid creating multiple address towards 472 * this id 473 */ 474 __set_bit(addrs[i].id, unavail_id); 475 msk->pm.subflows++; 476 i++; 477 } 478 } 479 } 480 481 return i; 482 } 483 484 static void __mptcp_pm_send_ack(struct mptcp_sock *msk, struct mptcp_subflow_context *subflow, 485 bool prio, bool backup) 486 { 487 struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 488 bool slow; 489 490 pr_debug("send ack for %s\n", 491 prio ? "mp_prio" : (mptcp_pm_should_add_signal(msk) ? "add_addr" : "rm_addr")); 492 493 slow = lock_sock_fast(ssk); 494 if (prio) { 495 subflow->send_mp_prio = 1; 496 subflow->request_bkup = backup; 497 } 498 499 __mptcp_subflow_send_ack(ssk); 500 unlock_sock_fast(ssk, slow); 501 } 502 503 static void mptcp_pm_send_ack(struct mptcp_sock *msk, struct mptcp_subflow_context *subflow, 504 bool prio, bool backup) 505 { 506 spin_unlock_bh(&msk->pm.lock); 507 __mptcp_pm_send_ack(msk, subflow, prio, backup); 508 spin_lock_bh(&msk->pm.lock); 509 } 510 511 static struct mptcp_pm_addr_entry * 512 __lookup_addr_by_id(struct pm_nl_pernet *pernet, unsigned int id) 513 { 514 struct mptcp_pm_addr_entry *entry; 515 516 list_for_each_entry(entry, &pernet->local_addr_list, list) { 517 if (entry->addr.id == id) 518 return entry; 519 } 520 return NULL; 521 } 522 523 static struct mptcp_pm_addr_entry * 524 __lookup_addr(struct pm_nl_pernet *pernet, const struct mptcp_addr_info *info, 525 bool lookup_by_id) 526 { 527 struct mptcp_pm_addr_entry *entry; 528 529 list_for_each_entry(entry, &pernet->local_addr_list, list) { 530 if ((!lookup_by_id && 531 mptcp_addresses_equal(&entry->addr, info, entry->addr.port)) || 532 (lookup_by_id && entry->addr.id == info->id)) 533 return entry; 534 } 535 return NULL; 536 } 537 538 static void mptcp_pm_create_subflow_or_signal_addr(struct mptcp_sock *msk) 539 { 540 struct sock *sk = (struct sock *)msk; 541 struct mptcp_pm_addr_entry local; 542 unsigned int add_addr_signal_max; 543 bool signal_and_subflow = false; 544 unsigned int local_addr_max; 545 struct pm_nl_pernet *pernet; 546 unsigned int subflows_max; 547 548 pernet = pm_nl_get_pernet(sock_net(sk)); 549 550 add_addr_signal_max = mptcp_pm_get_add_addr_signal_max(msk); 551 local_addr_max = mptcp_pm_get_local_addr_max(msk); 552 subflows_max = mptcp_pm_get_subflows_max(msk); 553 554 /* do lazy endpoint usage accounting for the MPC subflows */ 555 if (unlikely(!(msk->pm.status & BIT(MPTCP_PM_MPC_ENDPOINT_ACCOUNTED))) && msk->first) { 556 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(msk->first); 557 struct mptcp_pm_addr_entry *entry; 558 struct mptcp_addr_info mpc_addr; 559 bool backup = false; 560 561 mptcp_local_address((struct sock_common *)msk->first, &mpc_addr); 562 rcu_read_lock(); 563 entry = __lookup_addr(pernet, &mpc_addr, false); 564 if (entry) { 565 __clear_bit(entry->addr.id, msk->pm.id_avail_bitmap); 566 msk->mpc_endpoint_id = entry->addr.id; 567 backup = !!(entry->flags & MPTCP_PM_ADDR_FLAG_BACKUP); 568 } 569 rcu_read_unlock(); 570 571 if (backup) 572 mptcp_pm_send_ack(msk, subflow, true, backup); 573 574 msk->pm.status |= BIT(MPTCP_PM_MPC_ENDPOINT_ACCOUNTED); 575 } 576 577 pr_debug("local %d:%d signal %d:%d subflows %d:%d\n", 578 msk->pm.local_addr_used, local_addr_max, 579 msk->pm.add_addr_signaled, add_addr_signal_max, 580 msk->pm.subflows, subflows_max); 581 582 /* check first for announce */ 583 if (msk->pm.add_addr_signaled < add_addr_signal_max) { 584 /* due to racing events on both ends we can reach here while 585 * previous add address is still running: if we invoke now 586 * mptcp_pm_announce_addr(), that will fail and the 587 * corresponding id will be marked as used. 588 * Instead let the PM machinery reschedule us when the 589 * current address announce will be completed. 590 */ 591 if (msk->pm.addr_signal & BIT(MPTCP_ADD_ADDR_SIGNAL)) 592 return; 593 594 if (!select_signal_address(pernet, msk, &local)) 595 goto subflow; 596 597 /* If the alloc fails, we are on memory pressure, not worth 598 * continuing, and trying to create subflows. 599 */ 600 if (!mptcp_pm_alloc_anno_list(msk, &local.addr)) 601 return; 602 603 __clear_bit(local.addr.id, msk->pm.id_avail_bitmap); 604 msk->pm.add_addr_signaled++; 605 606 /* Special case for ID0: set the correct ID */ 607 if (local.addr.id == msk->mpc_endpoint_id) 608 local.addr.id = 0; 609 610 mptcp_pm_announce_addr(msk, &local.addr, false); 611 mptcp_pm_nl_addr_send_ack(msk); 612 613 if (local.flags & MPTCP_PM_ADDR_FLAG_SUBFLOW) 614 signal_and_subflow = true; 615 } 616 617 subflow: 618 /* check if should create a new subflow */ 619 while (msk->pm.local_addr_used < local_addr_max && 620 msk->pm.subflows < subflows_max) { 621 struct mptcp_addr_info addrs[MPTCP_PM_ADDR_MAX]; 622 bool fullmesh; 623 int i, nr; 624 625 if (signal_and_subflow) 626 signal_and_subflow = false; 627 else if (!select_local_address(pernet, msk, &local)) 628 break; 629 630 fullmesh = !!(local.flags & MPTCP_PM_ADDR_FLAG_FULLMESH); 631 632 __clear_bit(local.addr.id, msk->pm.id_avail_bitmap); 633 634 /* Special case for ID0: set the correct ID */ 635 if (local.addr.id == msk->mpc_endpoint_id) 636 local.addr.id = 0; 637 else /* local_addr_used is not decr for ID 0 */ 638 msk->pm.local_addr_used++; 639 640 nr = fill_remote_addresses_vec(msk, &local.addr, fullmesh, addrs); 641 if (nr == 0) 642 continue; 643 644 spin_unlock_bh(&msk->pm.lock); 645 for (i = 0; i < nr; i++) 646 __mptcp_subflow_connect(sk, &local.addr, &addrs[i]); 647 spin_lock_bh(&msk->pm.lock); 648 } 649 mptcp_pm_nl_check_work_pending(msk); 650 } 651 652 static void mptcp_pm_nl_fully_established(struct mptcp_sock *msk) 653 { 654 mptcp_pm_create_subflow_or_signal_addr(msk); 655 } 656 657 static void mptcp_pm_nl_subflow_established(struct mptcp_sock *msk) 658 { 659 mptcp_pm_create_subflow_or_signal_addr(msk); 660 } 661 662 /* Fill all the local addresses into the array addrs[], 663 * and return the array size. 664 */ 665 static unsigned int fill_local_addresses_vec(struct mptcp_sock *msk, 666 struct mptcp_addr_info *remote, 667 struct mptcp_addr_info *addrs) 668 { 669 struct sock *sk = (struct sock *)msk; 670 struct mptcp_pm_addr_entry *entry; 671 struct mptcp_addr_info mpc_addr; 672 struct pm_nl_pernet *pernet; 673 unsigned int subflows_max; 674 int i = 0; 675 676 pernet = pm_nl_get_pernet_from_msk(msk); 677 subflows_max = mptcp_pm_get_subflows_max(msk); 678 679 mptcp_local_address((struct sock_common *)msk, &mpc_addr); 680 681 rcu_read_lock(); 682 list_for_each_entry_rcu(entry, &pernet->local_addr_list, list) { 683 if (!(entry->flags & MPTCP_PM_ADDR_FLAG_FULLMESH)) 684 continue; 685 686 if (!mptcp_pm_addr_families_match(sk, &entry->addr, remote)) 687 continue; 688 689 if (msk->pm.subflows < subflows_max) { 690 msk->pm.subflows++; 691 addrs[i] = entry->addr; 692 693 /* Special case for ID0: set the correct ID */ 694 if (mptcp_addresses_equal(&entry->addr, &mpc_addr, entry->addr.port)) 695 addrs[i].id = 0; 696 697 i++; 698 } 699 } 700 rcu_read_unlock(); 701 702 /* If the array is empty, fill in the single 703 * 'IPADDRANY' local address 704 */ 705 if (!i) { 706 struct mptcp_addr_info local; 707 708 memset(&local, 0, sizeof(local)); 709 local.family = 710 #if IS_ENABLED(CONFIG_MPTCP_IPV6) 711 remote->family == AF_INET6 && 712 ipv6_addr_v4mapped(&remote->addr6) ? AF_INET : 713 #endif 714 remote->family; 715 716 if (!mptcp_pm_addr_families_match(sk, &local, remote)) 717 return 0; 718 719 msk->pm.subflows++; 720 addrs[i++] = local; 721 } 722 723 return i; 724 } 725 726 static void mptcp_pm_nl_add_addr_received(struct mptcp_sock *msk) 727 { 728 struct mptcp_addr_info addrs[MPTCP_PM_ADDR_MAX]; 729 struct sock *sk = (struct sock *)msk; 730 unsigned int add_addr_accept_max; 731 struct mptcp_addr_info remote; 732 unsigned int subflows_max; 733 bool sf_created = false; 734 int i, nr; 735 736 add_addr_accept_max = mptcp_pm_get_add_addr_accept_max(msk); 737 subflows_max = mptcp_pm_get_subflows_max(msk); 738 739 pr_debug("accepted %d:%d remote family %d\n", 740 msk->pm.add_addr_accepted, add_addr_accept_max, 741 msk->pm.remote.family); 742 743 remote = msk->pm.remote; 744 mptcp_pm_announce_addr(msk, &remote, true); 745 mptcp_pm_nl_addr_send_ack(msk); 746 747 if (lookup_subflow_by_daddr(&msk->conn_list, &remote)) 748 return; 749 750 /* pick id 0 port, if none is provided the remote address */ 751 if (!remote.port) 752 remote.port = sk->sk_dport; 753 754 /* connect to the specified remote address, using whatever 755 * local address the routing configuration will pick. 756 */ 757 nr = fill_local_addresses_vec(msk, &remote, addrs); 758 if (nr == 0) 759 return; 760 761 spin_unlock_bh(&msk->pm.lock); 762 for (i = 0; i < nr; i++) 763 if (__mptcp_subflow_connect(sk, &addrs[i], &remote) == 0) 764 sf_created = true; 765 spin_lock_bh(&msk->pm.lock); 766 767 if (sf_created) { 768 /* add_addr_accepted is not decr for ID 0 */ 769 if (remote.id) 770 msk->pm.add_addr_accepted++; 771 if (msk->pm.add_addr_accepted >= add_addr_accept_max || 772 msk->pm.subflows >= subflows_max) 773 WRITE_ONCE(msk->pm.accept_addr, false); 774 } 775 } 776 777 bool mptcp_pm_nl_is_init_remote_addr(struct mptcp_sock *msk, 778 const struct mptcp_addr_info *remote) 779 { 780 struct mptcp_addr_info mpc_remote; 781 782 remote_address((struct sock_common *)msk, &mpc_remote); 783 return mptcp_addresses_equal(&mpc_remote, remote, remote->port); 784 } 785 786 void mptcp_pm_nl_addr_send_ack(struct mptcp_sock *msk) 787 { 788 struct mptcp_subflow_context *subflow; 789 790 msk_owned_by_me(msk); 791 lockdep_assert_held(&msk->pm.lock); 792 793 if (!mptcp_pm_should_add_signal(msk) && 794 !mptcp_pm_should_rm_signal(msk)) 795 return; 796 797 mptcp_for_each_subflow(msk, subflow) { 798 if (__mptcp_subflow_active(subflow)) { 799 mptcp_pm_send_ack(msk, subflow, false, false); 800 break; 801 } 802 } 803 } 804 805 int mptcp_pm_nl_mp_prio_send_ack(struct mptcp_sock *msk, 806 struct mptcp_addr_info *addr, 807 struct mptcp_addr_info *rem, 808 u8 bkup) 809 { 810 struct mptcp_subflow_context *subflow; 811 812 pr_debug("bkup=%d\n", bkup); 813 814 mptcp_for_each_subflow(msk, subflow) { 815 struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 816 struct mptcp_addr_info local, remote; 817 818 mptcp_local_address((struct sock_common *)ssk, &local); 819 if (!mptcp_addresses_equal(&local, addr, addr->port)) 820 continue; 821 822 if (rem && rem->family != AF_UNSPEC) { 823 remote_address((struct sock_common *)ssk, &remote); 824 if (!mptcp_addresses_equal(&remote, rem, rem->port)) 825 continue; 826 } 827 828 __mptcp_pm_send_ack(msk, subflow, true, bkup); 829 return 0; 830 } 831 832 return -EINVAL; 833 } 834 835 static void mptcp_pm_nl_rm_addr_or_subflow(struct mptcp_sock *msk, 836 const struct mptcp_rm_list *rm_list, 837 enum linux_mptcp_mib_field rm_type) 838 { 839 struct mptcp_subflow_context *subflow, *tmp; 840 struct sock *sk = (struct sock *)msk; 841 u8 i; 842 843 pr_debug("%s rm_list_nr %d\n", 844 rm_type == MPTCP_MIB_RMADDR ? "address" : "subflow", rm_list->nr); 845 846 msk_owned_by_me(msk); 847 848 if (sk->sk_state == TCP_LISTEN) 849 return; 850 851 if (!rm_list->nr) 852 return; 853 854 if (list_empty(&msk->conn_list)) 855 return; 856 857 for (i = 0; i < rm_list->nr; i++) { 858 u8 rm_id = rm_list->ids[i]; 859 bool removed = false; 860 861 mptcp_for_each_subflow_safe(msk, subflow, tmp) { 862 struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 863 u8 remote_id = READ_ONCE(subflow->remote_id); 864 int how = RCV_SHUTDOWN | SEND_SHUTDOWN; 865 u8 id = subflow_get_local_id(subflow); 866 867 if ((1 << inet_sk_state_load(ssk)) & 868 (TCPF_FIN_WAIT1 | TCPF_FIN_WAIT2 | TCPF_CLOSING | TCPF_CLOSE)) 869 continue; 870 if (rm_type == MPTCP_MIB_RMADDR && remote_id != rm_id) 871 continue; 872 if (rm_type == MPTCP_MIB_RMSUBFLOW && id != rm_id) 873 continue; 874 875 pr_debug(" -> %s rm_list_ids[%d]=%u local_id=%u remote_id=%u mpc_id=%u\n", 876 rm_type == MPTCP_MIB_RMADDR ? "address" : "subflow", 877 i, rm_id, id, remote_id, msk->mpc_endpoint_id); 878 spin_unlock_bh(&msk->pm.lock); 879 mptcp_subflow_shutdown(sk, ssk, how); 880 removed |= subflow->request_join; 881 882 /* the following takes care of updating the subflows counter */ 883 mptcp_close_ssk(sk, ssk, subflow); 884 spin_lock_bh(&msk->pm.lock); 885 886 if (rm_type == MPTCP_MIB_RMSUBFLOW) 887 __MPTCP_INC_STATS(sock_net(sk), rm_type); 888 } 889 890 if (rm_type == MPTCP_MIB_RMADDR) 891 __MPTCP_INC_STATS(sock_net(sk), rm_type); 892 893 if (!removed) 894 continue; 895 896 if (!mptcp_pm_is_kernel(msk)) 897 continue; 898 899 if (rm_type == MPTCP_MIB_RMADDR && rm_id && 900 !WARN_ON_ONCE(msk->pm.add_addr_accepted == 0)) { 901 /* Note: if the subflow has been closed before, this 902 * add_addr_accepted counter will not be decremented. 903 */ 904 if (--msk->pm.add_addr_accepted < mptcp_pm_get_add_addr_accept_max(msk)) 905 WRITE_ONCE(msk->pm.accept_addr, true); 906 } 907 } 908 } 909 910 static void mptcp_pm_nl_rm_addr_received(struct mptcp_sock *msk) 911 { 912 mptcp_pm_nl_rm_addr_or_subflow(msk, &msk->pm.rm_list_rx, MPTCP_MIB_RMADDR); 913 } 914 915 static void mptcp_pm_nl_rm_subflow_received(struct mptcp_sock *msk, 916 const struct mptcp_rm_list *rm_list) 917 { 918 mptcp_pm_nl_rm_addr_or_subflow(msk, rm_list, MPTCP_MIB_RMSUBFLOW); 919 } 920 921 void mptcp_pm_nl_work(struct mptcp_sock *msk) 922 { 923 struct mptcp_pm_data *pm = &msk->pm; 924 925 msk_owned_by_me(msk); 926 927 if (!(pm->status & MPTCP_PM_WORK_MASK)) 928 return; 929 930 spin_lock_bh(&msk->pm.lock); 931 932 pr_debug("msk=%p status=%x\n", msk, pm->status); 933 if (pm->status & BIT(MPTCP_PM_ADD_ADDR_RECEIVED)) { 934 pm->status &= ~BIT(MPTCP_PM_ADD_ADDR_RECEIVED); 935 mptcp_pm_nl_add_addr_received(msk); 936 } 937 if (pm->status & BIT(MPTCP_PM_ADD_ADDR_SEND_ACK)) { 938 pm->status &= ~BIT(MPTCP_PM_ADD_ADDR_SEND_ACK); 939 mptcp_pm_nl_addr_send_ack(msk); 940 } 941 if (pm->status & BIT(MPTCP_PM_RM_ADDR_RECEIVED)) { 942 pm->status &= ~BIT(MPTCP_PM_RM_ADDR_RECEIVED); 943 mptcp_pm_nl_rm_addr_received(msk); 944 } 945 if (pm->status & BIT(MPTCP_PM_ESTABLISHED)) { 946 pm->status &= ~BIT(MPTCP_PM_ESTABLISHED); 947 mptcp_pm_nl_fully_established(msk); 948 } 949 if (pm->status & BIT(MPTCP_PM_SUBFLOW_ESTABLISHED)) { 950 pm->status &= ~BIT(MPTCP_PM_SUBFLOW_ESTABLISHED); 951 mptcp_pm_nl_subflow_established(msk); 952 } 953 954 spin_unlock_bh(&msk->pm.lock); 955 } 956 957 static bool address_use_port(struct mptcp_pm_addr_entry *entry) 958 { 959 return (entry->flags & 960 (MPTCP_PM_ADDR_FLAG_SIGNAL | MPTCP_PM_ADDR_FLAG_SUBFLOW)) == 961 MPTCP_PM_ADDR_FLAG_SIGNAL; 962 } 963 964 /* caller must ensure the RCU grace period is already elapsed */ 965 static void __mptcp_pm_release_addr_entry(struct mptcp_pm_addr_entry *entry) 966 { 967 if (entry->lsk) 968 sock_release(entry->lsk); 969 kfree(entry); 970 } 971 972 static int mptcp_pm_nl_append_new_local_addr(struct pm_nl_pernet *pernet, 973 struct mptcp_pm_addr_entry *entry, 974 bool needs_id) 975 { 976 struct mptcp_pm_addr_entry *cur, *del_entry = NULL; 977 unsigned int addr_max; 978 int ret = -EINVAL; 979 980 spin_lock_bh(&pernet->lock); 981 /* to keep the code simple, don't do IDR-like allocation for address ID, 982 * just bail when we exceed limits 983 */ 984 if (pernet->next_id == MPTCP_PM_MAX_ADDR_ID) 985 pernet->next_id = 1; 986 if (pernet->addrs >= MPTCP_PM_ADDR_MAX) { 987 ret = -ERANGE; 988 goto out; 989 } 990 if (test_bit(entry->addr.id, pernet->id_bitmap)) { 991 ret = -EBUSY; 992 goto out; 993 } 994 995 /* do not insert duplicate address, differentiate on port only 996 * singled addresses 997 */ 998 if (!address_use_port(entry)) 999 entry->addr.port = 0; 1000 list_for_each_entry(cur, &pernet->local_addr_list, list) { 1001 if (mptcp_addresses_equal(&cur->addr, &entry->addr, 1002 cur->addr.port || entry->addr.port)) { 1003 /* allow replacing the exiting endpoint only if such 1004 * endpoint is an implicit one and the user-space 1005 * did not provide an endpoint id 1006 */ 1007 if (!(cur->flags & MPTCP_PM_ADDR_FLAG_IMPLICIT)) { 1008 ret = -EEXIST; 1009 goto out; 1010 } 1011 if (entry->addr.id) 1012 goto out; 1013 1014 pernet->addrs--; 1015 entry->addr.id = cur->addr.id; 1016 list_del_rcu(&cur->list); 1017 del_entry = cur; 1018 break; 1019 } 1020 } 1021 1022 if (!entry->addr.id && needs_id) { 1023 find_next: 1024 entry->addr.id = find_next_zero_bit(pernet->id_bitmap, 1025 MPTCP_PM_MAX_ADDR_ID + 1, 1026 pernet->next_id); 1027 if (!entry->addr.id && pernet->next_id != 1) { 1028 pernet->next_id = 1; 1029 goto find_next; 1030 } 1031 } 1032 1033 if (!entry->addr.id && needs_id) 1034 goto out; 1035 1036 __set_bit(entry->addr.id, pernet->id_bitmap); 1037 if (entry->addr.id > pernet->next_id) 1038 pernet->next_id = entry->addr.id; 1039 1040 if (entry->flags & MPTCP_PM_ADDR_FLAG_SIGNAL) { 1041 addr_max = pernet->add_addr_signal_max; 1042 WRITE_ONCE(pernet->add_addr_signal_max, addr_max + 1); 1043 } 1044 if (entry->flags & MPTCP_PM_ADDR_FLAG_SUBFLOW) { 1045 addr_max = pernet->local_addr_max; 1046 WRITE_ONCE(pernet->local_addr_max, addr_max + 1); 1047 } 1048 1049 pernet->addrs++; 1050 if (!entry->addr.port) 1051 list_add_tail_rcu(&entry->list, &pernet->local_addr_list); 1052 else 1053 list_add_rcu(&entry->list, &pernet->local_addr_list); 1054 ret = entry->addr.id; 1055 1056 out: 1057 spin_unlock_bh(&pernet->lock); 1058 1059 /* just replaced an existing entry, free it */ 1060 if (del_entry) { 1061 synchronize_rcu(); 1062 __mptcp_pm_release_addr_entry(del_entry); 1063 } 1064 return ret; 1065 } 1066 1067 static struct lock_class_key mptcp_slock_keys[2]; 1068 static struct lock_class_key mptcp_keys[2]; 1069 1070 static int mptcp_pm_nl_create_listen_socket(struct sock *sk, 1071 struct mptcp_pm_addr_entry *entry) 1072 { 1073 bool is_ipv6 = sk->sk_family == AF_INET6; 1074 int addrlen = sizeof(struct sockaddr_in); 1075 struct sockaddr_storage addr; 1076 struct sock *newsk, *ssk; 1077 int backlog = 1024; 1078 int err; 1079 1080 err = sock_create_kern(sock_net(sk), entry->addr.family, 1081 SOCK_STREAM, IPPROTO_MPTCP, &entry->lsk); 1082 if (err) 1083 return err; 1084 1085 newsk = entry->lsk->sk; 1086 if (!newsk) 1087 return -EINVAL; 1088 1089 /* The subflow socket lock is acquired in a nested to the msk one 1090 * in several places, even by the TCP stack, and this msk is a kernel 1091 * socket: lockdep complains. Instead of propagating the _nested 1092 * modifiers in several places, re-init the lock class for the msk 1093 * socket to an mptcp specific one. 1094 */ 1095 sock_lock_init_class_and_name(newsk, 1096 is_ipv6 ? "mlock-AF_INET6" : "mlock-AF_INET", 1097 &mptcp_slock_keys[is_ipv6], 1098 is_ipv6 ? "msk_lock-AF_INET6" : "msk_lock-AF_INET", 1099 &mptcp_keys[is_ipv6]); 1100 1101 lock_sock(newsk); 1102 ssk = __mptcp_nmpc_sk(mptcp_sk(newsk)); 1103 release_sock(newsk); 1104 if (IS_ERR(ssk)) 1105 return PTR_ERR(ssk); 1106 1107 mptcp_info2sockaddr(&entry->addr, &addr, entry->addr.family); 1108 #if IS_ENABLED(CONFIG_MPTCP_IPV6) 1109 if (entry->addr.family == AF_INET6) 1110 addrlen = sizeof(struct sockaddr_in6); 1111 #endif 1112 if (ssk->sk_family == AF_INET) 1113 err = inet_bind_sk(ssk, (struct sockaddr *)&addr, addrlen); 1114 #if IS_ENABLED(CONFIG_MPTCP_IPV6) 1115 else if (ssk->sk_family == AF_INET6) 1116 err = inet6_bind_sk(ssk, (struct sockaddr *)&addr, addrlen); 1117 #endif 1118 if (err) 1119 return err; 1120 1121 /* We don't use mptcp_set_state() here because it needs to be called 1122 * under the msk socket lock. For the moment, that will not bring 1123 * anything more than only calling inet_sk_state_store(), because the 1124 * old status is known (TCP_CLOSE). 1125 */ 1126 inet_sk_state_store(newsk, TCP_LISTEN); 1127 lock_sock(ssk); 1128 WRITE_ONCE(mptcp_subflow_ctx(ssk)->pm_listener, true); 1129 err = __inet_listen_sk(ssk, backlog); 1130 if (!err) 1131 mptcp_event_pm_listener(ssk, MPTCP_EVENT_LISTENER_CREATED); 1132 release_sock(ssk); 1133 return err; 1134 } 1135 1136 int mptcp_pm_nl_get_local_id(struct mptcp_sock *msk, struct mptcp_addr_info *skc) 1137 { 1138 struct mptcp_pm_addr_entry *entry; 1139 struct pm_nl_pernet *pernet; 1140 int ret = -1; 1141 1142 pernet = pm_nl_get_pernet_from_msk(msk); 1143 1144 rcu_read_lock(); 1145 list_for_each_entry_rcu(entry, &pernet->local_addr_list, list) { 1146 if (mptcp_addresses_equal(&entry->addr, skc, entry->addr.port)) { 1147 ret = entry->addr.id; 1148 break; 1149 } 1150 } 1151 rcu_read_unlock(); 1152 if (ret >= 0) 1153 return ret; 1154 1155 /* address not found, add to local list */ 1156 entry = kmalloc(sizeof(*entry), GFP_ATOMIC); 1157 if (!entry) 1158 return -ENOMEM; 1159 1160 entry->addr = *skc; 1161 entry->addr.id = 0; 1162 entry->addr.port = 0; 1163 entry->ifindex = 0; 1164 entry->flags = MPTCP_PM_ADDR_FLAG_IMPLICIT; 1165 entry->lsk = NULL; 1166 ret = mptcp_pm_nl_append_new_local_addr(pernet, entry, true); 1167 if (ret < 0) 1168 kfree(entry); 1169 1170 return ret; 1171 } 1172 1173 bool mptcp_pm_nl_is_backup(struct mptcp_sock *msk, struct mptcp_addr_info *skc) 1174 { 1175 struct pm_nl_pernet *pernet = pm_nl_get_pernet_from_msk(msk); 1176 struct mptcp_pm_addr_entry *entry; 1177 bool backup = false; 1178 1179 rcu_read_lock(); 1180 list_for_each_entry_rcu(entry, &pernet->local_addr_list, list) { 1181 if (mptcp_addresses_equal(&entry->addr, skc, entry->addr.port)) { 1182 backup = !!(entry->flags & MPTCP_PM_ADDR_FLAG_BACKUP); 1183 break; 1184 } 1185 } 1186 rcu_read_unlock(); 1187 1188 return backup; 1189 } 1190 1191 #define MPTCP_PM_CMD_GRP_OFFSET 0 1192 #define MPTCP_PM_EV_GRP_OFFSET 1 1193 1194 static const struct genl_multicast_group mptcp_pm_mcgrps[] = { 1195 [MPTCP_PM_CMD_GRP_OFFSET] = { .name = MPTCP_PM_CMD_GRP_NAME, }, 1196 [MPTCP_PM_EV_GRP_OFFSET] = { .name = MPTCP_PM_EV_GRP_NAME, 1197 .flags = GENL_UNS_ADMIN_PERM, 1198 }, 1199 }; 1200 1201 static const struct nla_policy 1202 mptcp_pm_addr_policy[MPTCP_PM_ADDR_ATTR_MAX + 1] = { 1203 [MPTCP_PM_ADDR_ATTR_FAMILY] = { .type = NLA_U16, }, 1204 [MPTCP_PM_ADDR_ATTR_ID] = { .type = NLA_U8, }, 1205 [MPTCP_PM_ADDR_ATTR_ADDR4] = { .type = NLA_U32, }, 1206 [MPTCP_PM_ADDR_ATTR_ADDR6] = 1207 NLA_POLICY_EXACT_LEN(sizeof(struct in6_addr)), 1208 [MPTCP_PM_ADDR_ATTR_PORT] = { .type = NLA_U16 }, 1209 [MPTCP_PM_ADDR_ATTR_FLAGS] = { .type = NLA_U32 }, 1210 [MPTCP_PM_ADDR_ATTR_IF_IDX] = { .type = NLA_S32 }, 1211 }; 1212 1213 static const struct nla_policy mptcp_pm_policy[MPTCP_PM_ATTR_MAX + 1] = { 1214 [MPTCP_PM_ATTR_ADDR] = 1215 NLA_POLICY_NESTED(mptcp_pm_addr_policy), 1216 [MPTCP_PM_ATTR_RCV_ADD_ADDRS] = { .type = NLA_U32, }, 1217 [MPTCP_PM_ATTR_SUBFLOWS] = { .type = NLA_U32, }, 1218 [MPTCP_PM_ATTR_TOKEN] = { .type = NLA_U32, }, 1219 [MPTCP_PM_ATTR_LOC_ID] = { .type = NLA_U8, }, 1220 [MPTCP_PM_ATTR_ADDR_REMOTE] = 1221 NLA_POLICY_NESTED(mptcp_pm_addr_policy), 1222 }; 1223 1224 void mptcp_pm_nl_subflow_chk_stale(const struct mptcp_sock *msk, struct sock *ssk) 1225 { 1226 struct mptcp_subflow_context *iter, *subflow = mptcp_subflow_ctx(ssk); 1227 struct sock *sk = (struct sock *)msk; 1228 unsigned int active_max_loss_cnt; 1229 struct net *net = sock_net(sk); 1230 unsigned int stale_loss_cnt; 1231 bool slow; 1232 1233 stale_loss_cnt = mptcp_stale_loss_cnt(net); 1234 if (subflow->stale || !stale_loss_cnt || subflow->stale_count <= stale_loss_cnt) 1235 return; 1236 1237 /* look for another available subflow not in loss state */ 1238 active_max_loss_cnt = max_t(int, stale_loss_cnt - 1, 1); 1239 mptcp_for_each_subflow(msk, iter) { 1240 if (iter != subflow && mptcp_subflow_active(iter) && 1241 iter->stale_count < active_max_loss_cnt) { 1242 /* we have some alternatives, try to mark this subflow as idle ...*/ 1243 slow = lock_sock_fast(ssk); 1244 if (!tcp_rtx_and_write_queues_empty(ssk)) { 1245 subflow->stale = 1; 1246 __mptcp_retransmit_pending_data(sk); 1247 MPTCP_INC_STATS(net, MPTCP_MIB_SUBFLOWSTALE); 1248 } 1249 unlock_sock_fast(ssk, slow); 1250 1251 /* always try to push the pending data regardless of re-injections: 1252 * we can possibly use backup subflows now, and subflow selection 1253 * is cheap under the msk socket lock 1254 */ 1255 __mptcp_push_pending(sk, 0); 1256 return; 1257 } 1258 } 1259 } 1260 1261 static int mptcp_pm_family_to_addr(int family) 1262 { 1263 #if IS_ENABLED(CONFIG_MPTCP_IPV6) 1264 if (family == AF_INET6) 1265 return MPTCP_PM_ADDR_ATTR_ADDR6; 1266 #endif 1267 return MPTCP_PM_ADDR_ATTR_ADDR4; 1268 } 1269 1270 static int mptcp_pm_parse_pm_addr_attr(struct nlattr *tb[], 1271 const struct nlattr *attr, 1272 struct genl_info *info, 1273 struct mptcp_addr_info *addr, 1274 bool require_family) 1275 { 1276 int err, addr_addr; 1277 1278 if (!attr) { 1279 GENL_SET_ERR_MSG(info, "missing address info"); 1280 return -EINVAL; 1281 } 1282 1283 /* no validation needed - was already done via nested policy */ 1284 err = nla_parse_nested_deprecated(tb, MPTCP_PM_ADDR_ATTR_MAX, attr, 1285 mptcp_pm_addr_policy, info->extack); 1286 if (err) 1287 return err; 1288 1289 if (tb[MPTCP_PM_ADDR_ATTR_ID]) 1290 addr->id = nla_get_u8(tb[MPTCP_PM_ADDR_ATTR_ID]); 1291 1292 if (!tb[MPTCP_PM_ADDR_ATTR_FAMILY]) { 1293 if (!require_family) 1294 return 0; 1295 1296 NL_SET_ERR_MSG_ATTR(info->extack, attr, 1297 "missing family"); 1298 return -EINVAL; 1299 } 1300 1301 addr->family = nla_get_u16(tb[MPTCP_PM_ADDR_ATTR_FAMILY]); 1302 if (addr->family != AF_INET 1303 #if IS_ENABLED(CONFIG_MPTCP_IPV6) 1304 && addr->family != AF_INET6 1305 #endif 1306 ) { 1307 NL_SET_ERR_MSG_ATTR(info->extack, attr, 1308 "unknown address family"); 1309 return -EINVAL; 1310 } 1311 addr_addr = mptcp_pm_family_to_addr(addr->family); 1312 if (!tb[addr_addr]) { 1313 NL_SET_ERR_MSG_ATTR(info->extack, attr, 1314 "missing address data"); 1315 return -EINVAL; 1316 } 1317 1318 #if IS_ENABLED(CONFIG_MPTCP_IPV6) 1319 if (addr->family == AF_INET6) 1320 addr->addr6 = nla_get_in6_addr(tb[addr_addr]); 1321 else 1322 #endif 1323 addr->addr.s_addr = nla_get_in_addr(tb[addr_addr]); 1324 1325 if (tb[MPTCP_PM_ADDR_ATTR_PORT]) 1326 addr->port = htons(nla_get_u16(tb[MPTCP_PM_ADDR_ATTR_PORT])); 1327 1328 return 0; 1329 } 1330 1331 int mptcp_pm_parse_addr(struct nlattr *attr, struct genl_info *info, 1332 struct mptcp_addr_info *addr) 1333 { 1334 struct nlattr *tb[MPTCP_PM_ADDR_ATTR_MAX + 1]; 1335 1336 memset(addr, 0, sizeof(*addr)); 1337 1338 return mptcp_pm_parse_pm_addr_attr(tb, attr, info, addr, true); 1339 } 1340 1341 int mptcp_pm_parse_entry(struct nlattr *attr, struct genl_info *info, 1342 bool require_family, 1343 struct mptcp_pm_addr_entry *entry) 1344 { 1345 struct nlattr *tb[MPTCP_PM_ADDR_ATTR_MAX + 1]; 1346 int err; 1347 1348 memset(entry, 0, sizeof(*entry)); 1349 1350 err = mptcp_pm_parse_pm_addr_attr(tb, attr, info, &entry->addr, require_family); 1351 if (err) 1352 return err; 1353 1354 if (tb[MPTCP_PM_ADDR_ATTR_IF_IDX]) { 1355 u32 val = nla_get_s32(tb[MPTCP_PM_ADDR_ATTR_IF_IDX]); 1356 1357 entry->ifindex = val; 1358 } 1359 1360 if (tb[MPTCP_PM_ADDR_ATTR_FLAGS]) 1361 entry->flags = nla_get_u32(tb[MPTCP_PM_ADDR_ATTR_FLAGS]); 1362 1363 if (tb[MPTCP_PM_ADDR_ATTR_PORT]) 1364 entry->addr.port = htons(nla_get_u16(tb[MPTCP_PM_ADDR_ATTR_PORT])); 1365 1366 return 0; 1367 } 1368 1369 static struct pm_nl_pernet *genl_info_pm_nl(struct genl_info *info) 1370 { 1371 return pm_nl_get_pernet(genl_info_net(info)); 1372 } 1373 1374 static int mptcp_nl_add_subflow_or_signal_addr(struct net *net, 1375 struct mptcp_addr_info *addr) 1376 { 1377 struct mptcp_sock *msk; 1378 long s_slot = 0, s_num = 0; 1379 1380 while ((msk = mptcp_token_iter_next(net, &s_slot, &s_num)) != NULL) { 1381 struct sock *sk = (struct sock *)msk; 1382 struct mptcp_addr_info mpc_addr; 1383 1384 if (!READ_ONCE(msk->fully_established) || 1385 mptcp_pm_is_userspace(msk)) 1386 goto next; 1387 1388 /* if the endp linked to the init sf is re-added with a != ID */ 1389 mptcp_local_address((struct sock_common *)msk, &mpc_addr); 1390 1391 lock_sock(sk); 1392 spin_lock_bh(&msk->pm.lock); 1393 if (mptcp_addresses_equal(addr, &mpc_addr, addr->port)) 1394 msk->mpc_endpoint_id = addr->id; 1395 mptcp_pm_create_subflow_or_signal_addr(msk); 1396 spin_unlock_bh(&msk->pm.lock); 1397 release_sock(sk); 1398 1399 next: 1400 sock_put(sk); 1401 cond_resched(); 1402 } 1403 1404 return 0; 1405 } 1406 1407 static bool mptcp_pm_has_addr_attr_id(const struct nlattr *attr, 1408 struct genl_info *info) 1409 { 1410 struct nlattr *tb[MPTCP_PM_ADDR_ATTR_MAX + 1]; 1411 1412 if (!nla_parse_nested_deprecated(tb, MPTCP_PM_ADDR_ATTR_MAX, attr, 1413 mptcp_pm_addr_policy, info->extack) && 1414 tb[MPTCP_PM_ADDR_ATTR_ID]) 1415 return true; 1416 return false; 1417 } 1418 1419 static int mptcp_nl_cmd_add_addr(struct sk_buff *skb, struct genl_info *info) 1420 { 1421 struct nlattr *attr = info->attrs[MPTCP_PM_ATTR_ADDR]; 1422 struct pm_nl_pernet *pernet = genl_info_pm_nl(info); 1423 struct mptcp_pm_addr_entry addr, *entry; 1424 int ret; 1425 1426 ret = mptcp_pm_parse_entry(attr, info, true, &addr); 1427 if (ret < 0) 1428 return ret; 1429 1430 if (addr.addr.port && !address_use_port(&addr)) { 1431 GENL_SET_ERR_MSG(info, "flags must have signal and not subflow when using port"); 1432 return -EINVAL; 1433 } 1434 1435 if (addr.flags & MPTCP_PM_ADDR_FLAG_SIGNAL && 1436 addr.flags & MPTCP_PM_ADDR_FLAG_FULLMESH) { 1437 GENL_SET_ERR_MSG(info, "flags mustn't have both signal and fullmesh"); 1438 return -EINVAL; 1439 } 1440 1441 if (addr.flags & MPTCP_PM_ADDR_FLAG_IMPLICIT) { 1442 GENL_SET_ERR_MSG(info, "can't create IMPLICIT endpoint"); 1443 return -EINVAL; 1444 } 1445 1446 entry = kzalloc(sizeof(*entry), GFP_KERNEL_ACCOUNT); 1447 if (!entry) { 1448 GENL_SET_ERR_MSG(info, "can't allocate addr"); 1449 return -ENOMEM; 1450 } 1451 1452 *entry = addr; 1453 if (entry->addr.port) { 1454 ret = mptcp_pm_nl_create_listen_socket(skb->sk, entry); 1455 if (ret) { 1456 GENL_SET_ERR_MSG_FMT(info, "create listen socket error: %d", ret); 1457 goto out_free; 1458 } 1459 } 1460 ret = mptcp_pm_nl_append_new_local_addr(pernet, entry, 1461 !mptcp_pm_has_addr_attr_id(attr, info)); 1462 if (ret < 0) { 1463 GENL_SET_ERR_MSG_FMT(info, "too many addresses or duplicate one: %d", ret); 1464 goto out_free; 1465 } 1466 1467 mptcp_nl_add_subflow_or_signal_addr(sock_net(skb->sk), &entry->addr); 1468 return 0; 1469 1470 out_free: 1471 __mptcp_pm_release_addr_entry(entry); 1472 return ret; 1473 } 1474 1475 int mptcp_pm_nl_get_flags_and_ifindex_by_id(struct mptcp_sock *msk, unsigned int id, 1476 u8 *flags, int *ifindex) 1477 { 1478 struct mptcp_pm_addr_entry *entry; 1479 struct sock *sk = (struct sock *)msk; 1480 struct net *net = sock_net(sk); 1481 1482 /* No entries with ID 0 */ 1483 if (id == 0) 1484 return 0; 1485 1486 rcu_read_lock(); 1487 entry = __lookup_addr_by_id(pm_nl_get_pernet(net), id); 1488 if (entry) { 1489 *flags = entry->flags; 1490 *ifindex = entry->ifindex; 1491 } 1492 rcu_read_unlock(); 1493 1494 return 0; 1495 } 1496 1497 static bool remove_anno_list_by_saddr(struct mptcp_sock *msk, 1498 const struct mptcp_addr_info *addr) 1499 { 1500 struct mptcp_pm_add_entry *entry; 1501 1502 entry = mptcp_pm_del_add_timer(msk, addr, false); 1503 if (entry) { 1504 kfree(entry); 1505 return true; 1506 } 1507 1508 return false; 1509 } 1510 1511 static u8 mptcp_endp_get_local_id(struct mptcp_sock *msk, 1512 const struct mptcp_addr_info *addr) 1513 { 1514 return msk->mpc_endpoint_id == addr->id ? 0 : addr->id; 1515 } 1516 1517 static bool mptcp_pm_remove_anno_addr(struct mptcp_sock *msk, 1518 const struct mptcp_addr_info *addr, 1519 bool force) 1520 { 1521 struct mptcp_rm_list list = { .nr = 0 }; 1522 bool ret; 1523 1524 list.ids[list.nr++] = mptcp_endp_get_local_id(msk, addr); 1525 1526 ret = remove_anno_list_by_saddr(msk, addr); 1527 if (ret || force) { 1528 spin_lock_bh(&msk->pm.lock); 1529 if (ret) { 1530 __set_bit(addr->id, msk->pm.id_avail_bitmap); 1531 msk->pm.add_addr_signaled--; 1532 } 1533 mptcp_pm_remove_addr(msk, &list); 1534 spin_unlock_bh(&msk->pm.lock); 1535 } 1536 return ret; 1537 } 1538 1539 static void __mark_subflow_endp_available(struct mptcp_sock *msk, u8 id) 1540 { 1541 /* If it was marked as used, and not ID 0, decrement local_addr_used */ 1542 if (!__test_and_set_bit(id ? : msk->mpc_endpoint_id, msk->pm.id_avail_bitmap) && 1543 id && !WARN_ON_ONCE(msk->pm.local_addr_used == 0)) 1544 msk->pm.local_addr_used--; 1545 } 1546 1547 static int mptcp_nl_remove_subflow_and_signal_addr(struct net *net, 1548 const struct mptcp_pm_addr_entry *entry) 1549 { 1550 const struct mptcp_addr_info *addr = &entry->addr; 1551 struct mptcp_rm_list list = { .nr = 1 }; 1552 long s_slot = 0, s_num = 0; 1553 struct mptcp_sock *msk; 1554 1555 pr_debug("remove_id=%d\n", addr->id); 1556 1557 while ((msk = mptcp_token_iter_next(net, &s_slot, &s_num)) != NULL) { 1558 struct sock *sk = (struct sock *)msk; 1559 bool remove_subflow; 1560 1561 if (mptcp_pm_is_userspace(msk)) 1562 goto next; 1563 1564 if (list_empty(&msk->conn_list)) { 1565 mptcp_pm_remove_anno_addr(msk, addr, false); 1566 goto next; 1567 } 1568 1569 lock_sock(sk); 1570 remove_subflow = lookup_subflow_by_saddr(&msk->conn_list, addr); 1571 mptcp_pm_remove_anno_addr(msk, addr, remove_subflow && 1572 !(entry->flags & MPTCP_PM_ADDR_FLAG_IMPLICIT)); 1573 1574 list.ids[0] = mptcp_endp_get_local_id(msk, addr); 1575 if (remove_subflow) { 1576 spin_lock_bh(&msk->pm.lock); 1577 mptcp_pm_nl_rm_subflow_received(msk, &list); 1578 spin_unlock_bh(&msk->pm.lock); 1579 } 1580 1581 if (entry->flags & MPTCP_PM_ADDR_FLAG_SUBFLOW) { 1582 spin_lock_bh(&msk->pm.lock); 1583 __mark_subflow_endp_available(msk, list.ids[0]); 1584 spin_unlock_bh(&msk->pm.lock); 1585 } 1586 1587 if (msk->mpc_endpoint_id == entry->addr.id) 1588 msk->mpc_endpoint_id = 0; 1589 release_sock(sk); 1590 1591 next: 1592 sock_put(sk); 1593 cond_resched(); 1594 } 1595 1596 return 0; 1597 } 1598 1599 static int mptcp_nl_remove_id_zero_address(struct net *net, 1600 struct mptcp_addr_info *addr) 1601 { 1602 struct mptcp_rm_list list = { .nr = 0 }; 1603 long s_slot = 0, s_num = 0; 1604 struct mptcp_sock *msk; 1605 1606 list.ids[list.nr++] = 0; 1607 1608 while ((msk = mptcp_token_iter_next(net, &s_slot, &s_num)) != NULL) { 1609 struct sock *sk = (struct sock *)msk; 1610 struct mptcp_addr_info msk_local; 1611 1612 if (list_empty(&msk->conn_list) || mptcp_pm_is_userspace(msk)) 1613 goto next; 1614 1615 mptcp_local_address((struct sock_common *)msk, &msk_local); 1616 if (!mptcp_addresses_equal(&msk_local, addr, addr->port)) 1617 goto next; 1618 1619 lock_sock(sk); 1620 spin_lock_bh(&msk->pm.lock); 1621 mptcp_pm_remove_addr(msk, &list); 1622 mptcp_pm_nl_rm_subflow_received(msk, &list); 1623 __mark_subflow_endp_available(msk, 0); 1624 spin_unlock_bh(&msk->pm.lock); 1625 release_sock(sk); 1626 1627 next: 1628 sock_put(sk); 1629 cond_resched(); 1630 } 1631 1632 return 0; 1633 } 1634 1635 static int mptcp_nl_cmd_del_addr(struct sk_buff *skb, struct genl_info *info) 1636 { 1637 struct nlattr *attr = info->attrs[MPTCP_PM_ATTR_ADDR]; 1638 struct pm_nl_pernet *pernet = genl_info_pm_nl(info); 1639 struct mptcp_pm_addr_entry addr, *entry; 1640 unsigned int addr_max; 1641 int ret; 1642 1643 ret = mptcp_pm_parse_entry(attr, info, false, &addr); 1644 if (ret < 0) 1645 return ret; 1646 1647 /* the zero id address is special: the first address used by the msk 1648 * always gets such an id, so different subflows can have different zero 1649 * id addresses. Additionally zero id is not accounted for in id_bitmap. 1650 * Let's use an 'mptcp_rm_list' instead of the common remove code. 1651 */ 1652 if (addr.addr.id == 0) 1653 return mptcp_nl_remove_id_zero_address(sock_net(skb->sk), &addr.addr); 1654 1655 spin_lock_bh(&pernet->lock); 1656 entry = __lookup_addr_by_id(pernet, addr.addr.id); 1657 if (!entry) { 1658 GENL_SET_ERR_MSG(info, "address not found"); 1659 spin_unlock_bh(&pernet->lock); 1660 return -EINVAL; 1661 } 1662 if (entry->flags & MPTCP_PM_ADDR_FLAG_SIGNAL) { 1663 addr_max = pernet->add_addr_signal_max; 1664 WRITE_ONCE(pernet->add_addr_signal_max, addr_max - 1); 1665 } 1666 if (entry->flags & MPTCP_PM_ADDR_FLAG_SUBFLOW) { 1667 addr_max = pernet->local_addr_max; 1668 WRITE_ONCE(pernet->local_addr_max, addr_max - 1); 1669 } 1670 1671 pernet->addrs--; 1672 list_del_rcu(&entry->list); 1673 __clear_bit(entry->addr.id, pernet->id_bitmap); 1674 spin_unlock_bh(&pernet->lock); 1675 1676 mptcp_nl_remove_subflow_and_signal_addr(sock_net(skb->sk), entry); 1677 synchronize_rcu(); 1678 __mptcp_pm_release_addr_entry(entry); 1679 1680 return ret; 1681 } 1682 1683 /* Called from the userspace PM only */ 1684 void mptcp_pm_remove_addrs(struct mptcp_sock *msk, struct list_head *rm_list) 1685 { 1686 struct mptcp_rm_list alist = { .nr = 0 }; 1687 struct mptcp_pm_addr_entry *entry; 1688 int anno_nr = 0; 1689 1690 list_for_each_entry(entry, rm_list, list) { 1691 if (alist.nr >= MPTCP_RM_IDS_MAX) 1692 break; 1693 1694 /* only delete if either announced or matching a subflow */ 1695 if (remove_anno_list_by_saddr(msk, &entry->addr)) 1696 anno_nr++; 1697 else if (!lookup_subflow_by_saddr(&msk->conn_list, 1698 &entry->addr)) 1699 continue; 1700 1701 alist.ids[alist.nr++] = entry->addr.id; 1702 } 1703 1704 if (alist.nr) { 1705 spin_lock_bh(&msk->pm.lock); 1706 msk->pm.add_addr_signaled -= anno_nr; 1707 mptcp_pm_remove_addr(msk, &alist); 1708 spin_unlock_bh(&msk->pm.lock); 1709 } 1710 } 1711 1712 /* Called from the in-kernel PM only */ 1713 static void mptcp_pm_remove_addrs_and_subflows(struct mptcp_sock *msk, 1714 struct list_head *rm_list) 1715 { 1716 struct mptcp_rm_list alist = { .nr = 0 }, slist = { .nr = 0 }; 1717 struct mptcp_pm_addr_entry *entry; 1718 1719 list_for_each_entry(entry, rm_list, list) { 1720 if (slist.nr < MPTCP_RM_IDS_MAX && 1721 lookup_subflow_by_saddr(&msk->conn_list, &entry->addr)) 1722 slist.ids[slist.nr++] = mptcp_endp_get_local_id(msk, &entry->addr); 1723 1724 if (alist.nr < MPTCP_RM_IDS_MAX && 1725 remove_anno_list_by_saddr(msk, &entry->addr)) 1726 alist.ids[alist.nr++] = mptcp_endp_get_local_id(msk, &entry->addr); 1727 } 1728 1729 spin_lock_bh(&msk->pm.lock); 1730 if (alist.nr) { 1731 msk->pm.add_addr_signaled -= alist.nr; 1732 mptcp_pm_remove_addr(msk, &alist); 1733 } 1734 if (slist.nr) 1735 mptcp_pm_nl_rm_subflow_received(msk, &slist); 1736 /* Reset counters: maybe some subflows have been removed before */ 1737 bitmap_fill(msk->pm.id_avail_bitmap, MPTCP_PM_MAX_ADDR_ID + 1); 1738 msk->pm.local_addr_used = 0; 1739 spin_unlock_bh(&msk->pm.lock); 1740 } 1741 1742 static void mptcp_nl_remove_addrs_list(struct net *net, 1743 struct list_head *rm_list) 1744 { 1745 long s_slot = 0, s_num = 0; 1746 struct mptcp_sock *msk; 1747 1748 if (list_empty(rm_list)) 1749 return; 1750 1751 while ((msk = mptcp_token_iter_next(net, &s_slot, &s_num)) != NULL) { 1752 struct sock *sk = (struct sock *)msk; 1753 1754 if (!mptcp_pm_is_userspace(msk)) { 1755 lock_sock(sk); 1756 mptcp_pm_remove_addrs_and_subflows(msk, rm_list); 1757 release_sock(sk); 1758 } 1759 1760 sock_put(sk); 1761 cond_resched(); 1762 } 1763 } 1764 1765 /* caller must ensure the RCU grace period is already elapsed */ 1766 static void __flush_addrs(struct list_head *list) 1767 { 1768 while (!list_empty(list)) { 1769 struct mptcp_pm_addr_entry *cur; 1770 1771 cur = list_entry(list->next, 1772 struct mptcp_pm_addr_entry, list); 1773 list_del_rcu(&cur->list); 1774 __mptcp_pm_release_addr_entry(cur); 1775 } 1776 } 1777 1778 static void __reset_counters(struct pm_nl_pernet *pernet) 1779 { 1780 WRITE_ONCE(pernet->add_addr_signal_max, 0); 1781 WRITE_ONCE(pernet->add_addr_accept_max, 0); 1782 WRITE_ONCE(pernet->local_addr_max, 0); 1783 pernet->addrs = 0; 1784 } 1785 1786 static int mptcp_nl_cmd_flush_addrs(struct sk_buff *skb, struct genl_info *info) 1787 { 1788 struct pm_nl_pernet *pernet = genl_info_pm_nl(info); 1789 LIST_HEAD(free_list); 1790 1791 spin_lock_bh(&pernet->lock); 1792 list_splice_init(&pernet->local_addr_list, &free_list); 1793 __reset_counters(pernet); 1794 pernet->next_id = 1; 1795 bitmap_zero(pernet->id_bitmap, MPTCP_PM_MAX_ADDR_ID + 1); 1796 spin_unlock_bh(&pernet->lock); 1797 mptcp_nl_remove_addrs_list(sock_net(skb->sk), &free_list); 1798 synchronize_rcu(); 1799 __flush_addrs(&free_list); 1800 return 0; 1801 } 1802 1803 static int mptcp_nl_fill_addr(struct sk_buff *skb, 1804 struct mptcp_pm_addr_entry *entry) 1805 { 1806 struct mptcp_addr_info *addr = &entry->addr; 1807 struct nlattr *attr; 1808 1809 attr = nla_nest_start(skb, MPTCP_PM_ATTR_ADDR); 1810 if (!attr) 1811 return -EMSGSIZE; 1812 1813 if (nla_put_u16(skb, MPTCP_PM_ADDR_ATTR_FAMILY, addr->family)) 1814 goto nla_put_failure; 1815 if (nla_put_u16(skb, MPTCP_PM_ADDR_ATTR_PORT, ntohs(addr->port))) 1816 goto nla_put_failure; 1817 if (nla_put_u8(skb, MPTCP_PM_ADDR_ATTR_ID, addr->id)) 1818 goto nla_put_failure; 1819 if (nla_put_u32(skb, MPTCP_PM_ADDR_ATTR_FLAGS, entry->flags)) 1820 goto nla_put_failure; 1821 if (entry->ifindex && 1822 nla_put_s32(skb, MPTCP_PM_ADDR_ATTR_IF_IDX, entry->ifindex)) 1823 goto nla_put_failure; 1824 1825 if (addr->family == AF_INET && 1826 nla_put_in_addr(skb, MPTCP_PM_ADDR_ATTR_ADDR4, 1827 addr->addr.s_addr)) 1828 goto nla_put_failure; 1829 #if IS_ENABLED(CONFIG_MPTCP_IPV6) 1830 else if (addr->family == AF_INET6 && 1831 nla_put_in6_addr(skb, MPTCP_PM_ADDR_ATTR_ADDR6, &addr->addr6)) 1832 goto nla_put_failure; 1833 #endif 1834 nla_nest_end(skb, attr); 1835 return 0; 1836 1837 nla_put_failure: 1838 nla_nest_cancel(skb, attr); 1839 return -EMSGSIZE; 1840 } 1841 1842 static int mptcp_nl_cmd_get_addr(struct sk_buff *skb, struct genl_info *info) 1843 { 1844 struct nlattr *attr = info->attrs[MPTCP_PM_ATTR_ADDR]; 1845 struct pm_nl_pernet *pernet = genl_info_pm_nl(info); 1846 struct mptcp_pm_addr_entry addr, *entry; 1847 struct sk_buff *msg; 1848 void *reply; 1849 int ret; 1850 1851 ret = mptcp_pm_parse_entry(attr, info, false, &addr); 1852 if (ret < 0) 1853 return ret; 1854 1855 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1856 if (!msg) 1857 return -ENOMEM; 1858 1859 reply = genlmsg_put_reply(msg, info, &mptcp_genl_family, 0, 1860 info->genlhdr->cmd); 1861 if (!reply) { 1862 GENL_SET_ERR_MSG(info, "not enough space in Netlink message"); 1863 ret = -EMSGSIZE; 1864 goto fail; 1865 } 1866 1867 spin_lock_bh(&pernet->lock); 1868 entry = __lookup_addr_by_id(pernet, addr.addr.id); 1869 if (!entry) { 1870 GENL_SET_ERR_MSG(info, "address not found"); 1871 ret = -EINVAL; 1872 goto unlock_fail; 1873 } 1874 1875 ret = mptcp_nl_fill_addr(msg, entry); 1876 if (ret) 1877 goto unlock_fail; 1878 1879 genlmsg_end(msg, reply); 1880 ret = genlmsg_reply(msg, info); 1881 spin_unlock_bh(&pernet->lock); 1882 return ret; 1883 1884 unlock_fail: 1885 spin_unlock_bh(&pernet->lock); 1886 1887 fail: 1888 nlmsg_free(msg); 1889 return ret; 1890 } 1891 1892 static int mptcp_nl_cmd_dump_addrs(struct sk_buff *msg, 1893 struct netlink_callback *cb) 1894 { 1895 struct net *net = sock_net(msg->sk); 1896 struct mptcp_pm_addr_entry *entry; 1897 struct pm_nl_pernet *pernet; 1898 int id = cb->args[0]; 1899 void *hdr; 1900 int i; 1901 1902 pernet = pm_nl_get_pernet(net); 1903 1904 spin_lock_bh(&pernet->lock); 1905 for (i = id; i < MPTCP_PM_MAX_ADDR_ID + 1; i++) { 1906 if (test_bit(i, pernet->id_bitmap)) { 1907 entry = __lookup_addr_by_id(pernet, i); 1908 if (!entry) 1909 break; 1910 1911 if (entry->addr.id <= id) 1912 continue; 1913 1914 hdr = genlmsg_put(msg, NETLINK_CB(cb->skb).portid, 1915 cb->nlh->nlmsg_seq, &mptcp_genl_family, 1916 NLM_F_MULTI, MPTCP_PM_CMD_GET_ADDR); 1917 if (!hdr) 1918 break; 1919 1920 if (mptcp_nl_fill_addr(msg, entry) < 0) { 1921 genlmsg_cancel(msg, hdr); 1922 break; 1923 } 1924 1925 id = entry->addr.id; 1926 genlmsg_end(msg, hdr); 1927 } 1928 } 1929 spin_unlock_bh(&pernet->lock); 1930 1931 cb->args[0] = id; 1932 return msg->len; 1933 } 1934 1935 static int parse_limit(struct genl_info *info, int id, unsigned int *limit) 1936 { 1937 struct nlattr *attr = info->attrs[id]; 1938 1939 if (!attr) 1940 return 0; 1941 1942 *limit = nla_get_u32(attr); 1943 if (*limit > MPTCP_PM_ADDR_MAX) { 1944 GENL_SET_ERR_MSG(info, "limit greater than maximum"); 1945 return -EINVAL; 1946 } 1947 return 0; 1948 } 1949 1950 static int 1951 mptcp_nl_cmd_set_limits(struct sk_buff *skb, struct genl_info *info) 1952 { 1953 struct pm_nl_pernet *pernet = genl_info_pm_nl(info); 1954 unsigned int rcv_addrs, subflows; 1955 int ret; 1956 1957 spin_lock_bh(&pernet->lock); 1958 rcv_addrs = pernet->add_addr_accept_max; 1959 ret = parse_limit(info, MPTCP_PM_ATTR_RCV_ADD_ADDRS, &rcv_addrs); 1960 if (ret) 1961 goto unlock; 1962 1963 subflows = pernet->subflows_max; 1964 ret = parse_limit(info, MPTCP_PM_ATTR_SUBFLOWS, &subflows); 1965 if (ret) 1966 goto unlock; 1967 1968 WRITE_ONCE(pernet->add_addr_accept_max, rcv_addrs); 1969 WRITE_ONCE(pernet->subflows_max, subflows); 1970 1971 unlock: 1972 spin_unlock_bh(&pernet->lock); 1973 return ret; 1974 } 1975 1976 static int 1977 mptcp_nl_cmd_get_limits(struct sk_buff *skb, struct genl_info *info) 1978 { 1979 struct pm_nl_pernet *pernet = genl_info_pm_nl(info); 1980 struct sk_buff *msg; 1981 void *reply; 1982 1983 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1984 if (!msg) 1985 return -ENOMEM; 1986 1987 reply = genlmsg_put_reply(msg, info, &mptcp_genl_family, 0, 1988 MPTCP_PM_CMD_GET_LIMITS); 1989 if (!reply) 1990 goto fail; 1991 1992 if (nla_put_u32(msg, MPTCP_PM_ATTR_RCV_ADD_ADDRS, 1993 READ_ONCE(pernet->add_addr_accept_max))) 1994 goto fail; 1995 1996 if (nla_put_u32(msg, MPTCP_PM_ATTR_SUBFLOWS, 1997 READ_ONCE(pernet->subflows_max))) 1998 goto fail; 1999 2000 genlmsg_end(msg, reply); 2001 return genlmsg_reply(msg, info); 2002 2003 fail: 2004 GENL_SET_ERR_MSG(info, "not enough space in Netlink message"); 2005 nlmsg_free(msg); 2006 return -EMSGSIZE; 2007 } 2008 2009 static void mptcp_pm_nl_fullmesh(struct mptcp_sock *msk, 2010 struct mptcp_addr_info *addr) 2011 { 2012 struct mptcp_rm_list list = { .nr = 0 }; 2013 2014 list.ids[list.nr++] = mptcp_endp_get_local_id(msk, addr); 2015 2016 spin_lock_bh(&msk->pm.lock); 2017 mptcp_pm_nl_rm_subflow_received(msk, &list); 2018 __mark_subflow_endp_available(msk, list.ids[0]); 2019 mptcp_pm_create_subflow_or_signal_addr(msk); 2020 spin_unlock_bh(&msk->pm.lock); 2021 } 2022 2023 static int mptcp_nl_set_flags(struct net *net, 2024 struct mptcp_addr_info *addr, 2025 u8 bkup, u8 changed) 2026 { 2027 long s_slot = 0, s_num = 0; 2028 struct mptcp_sock *msk; 2029 int ret = -EINVAL; 2030 2031 while ((msk = mptcp_token_iter_next(net, &s_slot, &s_num)) != NULL) { 2032 struct sock *sk = (struct sock *)msk; 2033 2034 if (list_empty(&msk->conn_list) || mptcp_pm_is_userspace(msk)) 2035 goto next; 2036 2037 lock_sock(sk); 2038 if (changed & MPTCP_PM_ADDR_FLAG_BACKUP) 2039 ret = mptcp_pm_nl_mp_prio_send_ack(msk, addr, NULL, bkup); 2040 if (changed & MPTCP_PM_ADDR_FLAG_FULLMESH) 2041 mptcp_pm_nl_fullmesh(msk, addr); 2042 release_sock(sk); 2043 2044 next: 2045 sock_put(sk); 2046 cond_resched(); 2047 } 2048 2049 return ret; 2050 } 2051 2052 int mptcp_pm_nl_set_flags(struct net *net, struct mptcp_pm_addr_entry *addr, u8 bkup) 2053 { 2054 struct pm_nl_pernet *pernet = pm_nl_get_pernet(net); 2055 u8 changed, mask = MPTCP_PM_ADDR_FLAG_BACKUP | 2056 MPTCP_PM_ADDR_FLAG_FULLMESH; 2057 struct mptcp_pm_addr_entry *entry; 2058 u8 lookup_by_id = 0; 2059 2060 if (addr->addr.family == AF_UNSPEC) { 2061 lookup_by_id = 1; 2062 if (!addr->addr.id) 2063 return -EOPNOTSUPP; 2064 } 2065 2066 spin_lock_bh(&pernet->lock); 2067 entry = __lookup_addr(pernet, &addr->addr, lookup_by_id); 2068 if (!entry) { 2069 spin_unlock_bh(&pernet->lock); 2070 return -EINVAL; 2071 } 2072 if ((addr->flags & MPTCP_PM_ADDR_FLAG_FULLMESH) && 2073 (entry->flags & MPTCP_PM_ADDR_FLAG_SIGNAL)) { 2074 spin_unlock_bh(&pernet->lock); 2075 return -EINVAL; 2076 } 2077 2078 changed = (addr->flags ^ entry->flags) & mask; 2079 entry->flags = (entry->flags & ~mask) | (addr->flags & mask); 2080 *addr = *entry; 2081 spin_unlock_bh(&pernet->lock); 2082 2083 mptcp_nl_set_flags(net, &addr->addr, bkup, changed); 2084 return 0; 2085 } 2086 2087 static int mptcp_nl_cmd_set_flags(struct sk_buff *skb, struct genl_info *info) 2088 { 2089 struct mptcp_pm_addr_entry remote = { .addr = { .family = AF_UNSPEC }, }; 2090 struct mptcp_pm_addr_entry addr = { .addr = { .family = AF_UNSPEC }, }; 2091 struct nlattr *attr_rem = info->attrs[MPTCP_PM_ATTR_ADDR_REMOTE]; 2092 struct nlattr *token = info->attrs[MPTCP_PM_ATTR_TOKEN]; 2093 struct nlattr *attr = info->attrs[MPTCP_PM_ATTR_ADDR]; 2094 struct net *net = sock_net(skb->sk); 2095 u8 bkup = 0; 2096 int ret; 2097 2098 ret = mptcp_pm_parse_entry(attr, info, false, &addr); 2099 if (ret < 0) 2100 return ret; 2101 2102 if (attr_rem) { 2103 ret = mptcp_pm_parse_entry(attr_rem, info, false, &remote); 2104 if (ret < 0) 2105 return ret; 2106 } 2107 2108 if (addr.flags & MPTCP_PM_ADDR_FLAG_BACKUP) 2109 bkup = 1; 2110 2111 return mptcp_pm_set_flags(net, token, &addr, &remote, bkup); 2112 } 2113 2114 static void mptcp_nl_mcast_send(struct net *net, struct sk_buff *nlskb, gfp_t gfp) 2115 { 2116 genlmsg_multicast_netns(&mptcp_genl_family, net, 2117 nlskb, 0, MPTCP_PM_EV_GRP_OFFSET, gfp); 2118 } 2119 2120 bool mptcp_userspace_pm_active(const struct mptcp_sock *msk) 2121 { 2122 return genl_has_listeners(&mptcp_genl_family, 2123 sock_net((const struct sock *)msk), 2124 MPTCP_PM_EV_GRP_OFFSET); 2125 } 2126 2127 static int mptcp_event_add_subflow(struct sk_buff *skb, const struct sock *ssk) 2128 { 2129 const struct inet_sock *issk = inet_sk(ssk); 2130 const struct mptcp_subflow_context *sf; 2131 2132 if (nla_put_u16(skb, MPTCP_ATTR_FAMILY, ssk->sk_family)) 2133 return -EMSGSIZE; 2134 2135 switch (ssk->sk_family) { 2136 case AF_INET: 2137 if (nla_put_in_addr(skb, MPTCP_ATTR_SADDR4, issk->inet_saddr)) 2138 return -EMSGSIZE; 2139 if (nla_put_in_addr(skb, MPTCP_ATTR_DADDR4, issk->inet_daddr)) 2140 return -EMSGSIZE; 2141 break; 2142 #if IS_ENABLED(CONFIG_MPTCP_IPV6) 2143 case AF_INET6: { 2144 const struct ipv6_pinfo *np = inet6_sk(ssk); 2145 2146 if (nla_put_in6_addr(skb, MPTCP_ATTR_SADDR6, &np->saddr)) 2147 return -EMSGSIZE; 2148 if (nla_put_in6_addr(skb, MPTCP_ATTR_DADDR6, &ssk->sk_v6_daddr)) 2149 return -EMSGSIZE; 2150 break; 2151 } 2152 #endif 2153 default: 2154 WARN_ON_ONCE(1); 2155 return -EMSGSIZE; 2156 } 2157 2158 if (nla_put_be16(skb, MPTCP_ATTR_SPORT, issk->inet_sport)) 2159 return -EMSGSIZE; 2160 if (nla_put_be16(skb, MPTCP_ATTR_DPORT, issk->inet_dport)) 2161 return -EMSGSIZE; 2162 2163 sf = mptcp_subflow_ctx(ssk); 2164 if (WARN_ON_ONCE(!sf)) 2165 return -EINVAL; 2166 2167 if (nla_put_u8(skb, MPTCP_ATTR_LOC_ID, subflow_get_local_id(sf))) 2168 return -EMSGSIZE; 2169 2170 if (nla_put_u8(skb, MPTCP_ATTR_REM_ID, sf->remote_id)) 2171 return -EMSGSIZE; 2172 2173 return 0; 2174 } 2175 2176 static int mptcp_event_put_token_and_ssk(struct sk_buff *skb, 2177 const struct mptcp_sock *msk, 2178 const struct sock *ssk) 2179 { 2180 const struct sock *sk = (const struct sock *)msk; 2181 const struct mptcp_subflow_context *sf; 2182 u8 sk_err; 2183 2184 if (nla_put_u32(skb, MPTCP_ATTR_TOKEN, msk->token)) 2185 return -EMSGSIZE; 2186 2187 if (mptcp_event_add_subflow(skb, ssk)) 2188 return -EMSGSIZE; 2189 2190 sf = mptcp_subflow_ctx(ssk); 2191 if (WARN_ON_ONCE(!sf)) 2192 return -EINVAL; 2193 2194 if (nla_put_u8(skb, MPTCP_ATTR_BACKUP, sf->backup)) 2195 return -EMSGSIZE; 2196 2197 if (ssk->sk_bound_dev_if && 2198 nla_put_s32(skb, MPTCP_ATTR_IF_IDX, ssk->sk_bound_dev_if)) 2199 return -EMSGSIZE; 2200 2201 sk_err = READ_ONCE(ssk->sk_err); 2202 if (sk_err && sk->sk_state == TCP_ESTABLISHED && 2203 nla_put_u8(skb, MPTCP_ATTR_ERROR, sk_err)) 2204 return -EMSGSIZE; 2205 2206 return 0; 2207 } 2208 2209 static int mptcp_event_sub_established(struct sk_buff *skb, 2210 const struct mptcp_sock *msk, 2211 const struct sock *ssk) 2212 { 2213 return mptcp_event_put_token_and_ssk(skb, msk, ssk); 2214 } 2215 2216 static int mptcp_event_sub_closed(struct sk_buff *skb, 2217 const struct mptcp_sock *msk, 2218 const struct sock *ssk) 2219 { 2220 const struct mptcp_subflow_context *sf; 2221 2222 if (mptcp_event_put_token_and_ssk(skb, msk, ssk)) 2223 return -EMSGSIZE; 2224 2225 sf = mptcp_subflow_ctx(ssk); 2226 if (!sf->reset_seen) 2227 return 0; 2228 2229 if (nla_put_u32(skb, MPTCP_ATTR_RESET_REASON, sf->reset_reason)) 2230 return -EMSGSIZE; 2231 2232 if (nla_put_u32(skb, MPTCP_ATTR_RESET_FLAGS, sf->reset_transient)) 2233 return -EMSGSIZE; 2234 2235 return 0; 2236 } 2237 2238 static int mptcp_event_created(struct sk_buff *skb, 2239 const struct mptcp_sock *msk, 2240 const struct sock *ssk) 2241 { 2242 int err = nla_put_u32(skb, MPTCP_ATTR_TOKEN, msk->token); 2243 2244 if (err) 2245 return err; 2246 2247 if (nla_put_u8(skb, MPTCP_ATTR_SERVER_SIDE, READ_ONCE(msk->pm.server_side))) 2248 return -EMSGSIZE; 2249 2250 return mptcp_event_add_subflow(skb, ssk); 2251 } 2252 2253 void mptcp_event_addr_removed(const struct mptcp_sock *msk, uint8_t id) 2254 { 2255 struct net *net = sock_net((const struct sock *)msk); 2256 struct nlmsghdr *nlh; 2257 struct sk_buff *skb; 2258 2259 if (!genl_has_listeners(&mptcp_genl_family, net, MPTCP_PM_EV_GRP_OFFSET)) 2260 return; 2261 2262 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 2263 if (!skb) 2264 return; 2265 2266 nlh = genlmsg_put(skb, 0, 0, &mptcp_genl_family, 0, MPTCP_EVENT_REMOVED); 2267 if (!nlh) 2268 goto nla_put_failure; 2269 2270 if (nla_put_u32(skb, MPTCP_ATTR_TOKEN, msk->token)) 2271 goto nla_put_failure; 2272 2273 if (nla_put_u8(skb, MPTCP_ATTR_REM_ID, id)) 2274 goto nla_put_failure; 2275 2276 genlmsg_end(skb, nlh); 2277 mptcp_nl_mcast_send(net, skb, GFP_ATOMIC); 2278 return; 2279 2280 nla_put_failure: 2281 nlmsg_free(skb); 2282 } 2283 2284 void mptcp_event_addr_announced(const struct sock *ssk, 2285 const struct mptcp_addr_info *info) 2286 { 2287 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); 2288 struct mptcp_sock *msk = mptcp_sk(subflow->conn); 2289 struct net *net = sock_net(ssk); 2290 struct nlmsghdr *nlh; 2291 struct sk_buff *skb; 2292 2293 if (!genl_has_listeners(&mptcp_genl_family, net, MPTCP_PM_EV_GRP_OFFSET)) 2294 return; 2295 2296 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 2297 if (!skb) 2298 return; 2299 2300 nlh = genlmsg_put(skb, 0, 0, &mptcp_genl_family, 0, 2301 MPTCP_EVENT_ANNOUNCED); 2302 if (!nlh) 2303 goto nla_put_failure; 2304 2305 if (nla_put_u32(skb, MPTCP_ATTR_TOKEN, msk->token)) 2306 goto nla_put_failure; 2307 2308 if (nla_put_u8(skb, MPTCP_ATTR_REM_ID, info->id)) 2309 goto nla_put_failure; 2310 2311 if (nla_put_be16(skb, MPTCP_ATTR_DPORT, 2312 info->port == 0 ? 2313 inet_sk(ssk)->inet_dport : 2314 info->port)) 2315 goto nla_put_failure; 2316 2317 switch (info->family) { 2318 case AF_INET: 2319 if (nla_put_in_addr(skb, MPTCP_ATTR_DADDR4, info->addr.s_addr)) 2320 goto nla_put_failure; 2321 break; 2322 #if IS_ENABLED(CONFIG_MPTCP_IPV6) 2323 case AF_INET6: 2324 if (nla_put_in6_addr(skb, MPTCP_ATTR_DADDR6, &info->addr6)) 2325 goto nla_put_failure; 2326 break; 2327 #endif 2328 default: 2329 WARN_ON_ONCE(1); 2330 goto nla_put_failure; 2331 } 2332 2333 genlmsg_end(skb, nlh); 2334 mptcp_nl_mcast_send(net, skb, GFP_ATOMIC); 2335 return; 2336 2337 nla_put_failure: 2338 nlmsg_free(skb); 2339 } 2340 2341 void mptcp_event_pm_listener(const struct sock *ssk, 2342 enum mptcp_event_type event) 2343 { 2344 const struct inet_sock *issk = inet_sk(ssk); 2345 struct net *net = sock_net(ssk); 2346 struct nlmsghdr *nlh; 2347 struct sk_buff *skb; 2348 2349 if (!genl_has_listeners(&mptcp_genl_family, net, MPTCP_PM_EV_GRP_OFFSET)) 2350 return; 2351 2352 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 2353 if (!skb) 2354 return; 2355 2356 nlh = genlmsg_put(skb, 0, 0, &mptcp_genl_family, 0, event); 2357 if (!nlh) 2358 goto nla_put_failure; 2359 2360 if (nla_put_u16(skb, MPTCP_ATTR_FAMILY, ssk->sk_family)) 2361 goto nla_put_failure; 2362 2363 if (nla_put_be16(skb, MPTCP_ATTR_SPORT, issk->inet_sport)) 2364 goto nla_put_failure; 2365 2366 switch (ssk->sk_family) { 2367 case AF_INET: 2368 if (nla_put_in_addr(skb, MPTCP_ATTR_SADDR4, issk->inet_saddr)) 2369 goto nla_put_failure; 2370 break; 2371 #if IS_ENABLED(CONFIG_MPTCP_IPV6) 2372 case AF_INET6: { 2373 const struct ipv6_pinfo *np = inet6_sk(ssk); 2374 2375 if (nla_put_in6_addr(skb, MPTCP_ATTR_SADDR6, &np->saddr)) 2376 goto nla_put_failure; 2377 break; 2378 } 2379 #endif 2380 default: 2381 WARN_ON_ONCE(1); 2382 goto nla_put_failure; 2383 } 2384 2385 genlmsg_end(skb, nlh); 2386 mptcp_nl_mcast_send(net, skb, GFP_KERNEL); 2387 return; 2388 2389 nla_put_failure: 2390 nlmsg_free(skb); 2391 } 2392 2393 void mptcp_event(enum mptcp_event_type type, const struct mptcp_sock *msk, 2394 const struct sock *ssk, gfp_t gfp) 2395 { 2396 struct net *net = sock_net((const struct sock *)msk); 2397 struct nlmsghdr *nlh; 2398 struct sk_buff *skb; 2399 2400 if (!genl_has_listeners(&mptcp_genl_family, net, MPTCP_PM_EV_GRP_OFFSET)) 2401 return; 2402 2403 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, gfp); 2404 if (!skb) 2405 return; 2406 2407 nlh = genlmsg_put(skb, 0, 0, &mptcp_genl_family, 0, type); 2408 if (!nlh) 2409 goto nla_put_failure; 2410 2411 switch (type) { 2412 case MPTCP_EVENT_UNSPEC: 2413 WARN_ON_ONCE(1); 2414 break; 2415 case MPTCP_EVENT_CREATED: 2416 case MPTCP_EVENT_ESTABLISHED: 2417 if (mptcp_event_created(skb, msk, ssk) < 0) 2418 goto nla_put_failure; 2419 break; 2420 case MPTCP_EVENT_CLOSED: 2421 if (nla_put_u32(skb, MPTCP_ATTR_TOKEN, msk->token) < 0) 2422 goto nla_put_failure; 2423 break; 2424 case MPTCP_EVENT_ANNOUNCED: 2425 case MPTCP_EVENT_REMOVED: 2426 /* call mptcp_event_addr_announced()/removed instead */ 2427 WARN_ON_ONCE(1); 2428 break; 2429 case MPTCP_EVENT_SUB_ESTABLISHED: 2430 case MPTCP_EVENT_SUB_PRIORITY: 2431 if (mptcp_event_sub_established(skb, msk, ssk) < 0) 2432 goto nla_put_failure; 2433 break; 2434 case MPTCP_EVENT_SUB_CLOSED: 2435 if (mptcp_event_sub_closed(skb, msk, ssk) < 0) 2436 goto nla_put_failure; 2437 break; 2438 case MPTCP_EVENT_LISTENER_CREATED: 2439 case MPTCP_EVENT_LISTENER_CLOSED: 2440 break; 2441 } 2442 2443 genlmsg_end(skb, nlh); 2444 mptcp_nl_mcast_send(net, skb, gfp); 2445 return; 2446 2447 nla_put_failure: 2448 nlmsg_free(skb); 2449 } 2450 2451 static const struct genl_small_ops mptcp_pm_ops[] = { 2452 { 2453 .cmd = MPTCP_PM_CMD_ADD_ADDR, 2454 .doit = mptcp_nl_cmd_add_addr, 2455 .flags = GENL_UNS_ADMIN_PERM, 2456 }, 2457 { 2458 .cmd = MPTCP_PM_CMD_DEL_ADDR, 2459 .doit = mptcp_nl_cmd_del_addr, 2460 .flags = GENL_UNS_ADMIN_PERM, 2461 }, 2462 { 2463 .cmd = MPTCP_PM_CMD_FLUSH_ADDRS, 2464 .doit = mptcp_nl_cmd_flush_addrs, 2465 .flags = GENL_UNS_ADMIN_PERM, 2466 }, 2467 { 2468 .cmd = MPTCP_PM_CMD_GET_ADDR, 2469 .doit = mptcp_nl_cmd_get_addr, 2470 .dumpit = mptcp_nl_cmd_dump_addrs, 2471 }, 2472 { 2473 .cmd = MPTCP_PM_CMD_SET_LIMITS, 2474 .doit = mptcp_nl_cmd_set_limits, 2475 .flags = GENL_UNS_ADMIN_PERM, 2476 }, 2477 { 2478 .cmd = MPTCP_PM_CMD_GET_LIMITS, 2479 .doit = mptcp_nl_cmd_get_limits, 2480 }, 2481 { 2482 .cmd = MPTCP_PM_CMD_SET_FLAGS, 2483 .doit = mptcp_nl_cmd_set_flags, 2484 .flags = GENL_UNS_ADMIN_PERM, 2485 }, 2486 { 2487 .cmd = MPTCP_PM_CMD_ANNOUNCE, 2488 .doit = mptcp_nl_cmd_announce, 2489 .flags = GENL_UNS_ADMIN_PERM, 2490 }, 2491 { 2492 .cmd = MPTCP_PM_CMD_REMOVE, 2493 .doit = mptcp_nl_cmd_remove, 2494 .flags = GENL_UNS_ADMIN_PERM, 2495 }, 2496 { 2497 .cmd = MPTCP_PM_CMD_SUBFLOW_CREATE, 2498 .doit = mptcp_nl_cmd_sf_create, 2499 .flags = GENL_UNS_ADMIN_PERM, 2500 }, 2501 { 2502 .cmd = MPTCP_PM_CMD_SUBFLOW_DESTROY, 2503 .doit = mptcp_nl_cmd_sf_destroy, 2504 .flags = GENL_UNS_ADMIN_PERM, 2505 }, 2506 }; 2507 2508 static struct genl_family mptcp_genl_family __ro_after_init = { 2509 .name = MPTCP_PM_NAME, 2510 .version = MPTCP_PM_VER, 2511 .maxattr = MPTCP_PM_ATTR_MAX, 2512 .policy = mptcp_pm_policy, 2513 .netnsok = true, 2514 .module = THIS_MODULE, 2515 .small_ops = mptcp_pm_ops, 2516 .n_small_ops = ARRAY_SIZE(mptcp_pm_ops), 2517 .resv_start_op = MPTCP_PM_CMD_SUBFLOW_DESTROY + 1, 2518 .mcgrps = mptcp_pm_mcgrps, 2519 .n_mcgrps = ARRAY_SIZE(mptcp_pm_mcgrps), 2520 }; 2521 2522 static int __net_init pm_nl_init_net(struct net *net) 2523 { 2524 struct pm_nl_pernet *pernet = pm_nl_get_pernet(net); 2525 2526 INIT_LIST_HEAD_RCU(&pernet->local_addr_list); 2527 2528 /* Cit. 2 subflows ought to be enough for anybody. */ 2529 pernet->subflows_max = 2; 2530 pernet->next_id = 1; 2531 pernet->stale_loss_cnt = 4; 2532 spin_lock_init(&pernet->lock); 2533 2534 /* No need to initialize other pernet fields, the struct is zeroed at 2535 * allocation time. 2536 */ 2537 2538 return 0; 2539 } 2540 2541 static void __net_exit pm_nl_exit_net(struct list_head *net_list) 2542 { 2543 struct net *net; 2544 2545 list_for_each_entry(net, net_list, exit_list) { 2546 struct pm_nl_pernet *pernet = pm_nl_get_pernet(net); 2547 2548 /* net is removed from namespace list, can't race with 2549 * other modifiers, also netns core already waited for a 2550 * RCU grace period. 2551 */ 2552 __flush_addrs(&pernet->local_addr_list); 2553 } 2554 } 2555 2556 static struct pernet_operations mptcp_pm_pernet_ops = { 2557 .init = pm_nl_init_net, 2558 .exit_batch = pm_nl_exit_net, 2559 .id = &pm_nl_pernet_id, 2560 .size = sizeof(struct pm_nl_pernet), 2561 }; 2562 2563 void __init mptcp_pm_nl_init(void) 2564 { 2565 if (register_pernet_subsys(&mptcp_pm_pernet_ops) < 0) 2566 panic("Failed to register MPTCP PM pernet subsystem.\n"); 2567 2568 if (genl_register_family(&mptcp_genl_family)) 2569 panic("Failed to register MPTCP PM netlink family\n"); 2570 } 2571