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