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