1d021c344SAndy King /* 2d021c344SAndy King * VMware vSockets Driver 3d021c344SAndy King * 4d021c344SAndy King * Copyright (C) 2007-2013 VMware, Inc. All rights reserved. 5d021c344SAndy King * 6d021c344SAndy King * This program is free software; you can redistribute it and/or modify it 7d021c344SAndy King * under the terms of the GNU General Public License as published by the Free 8d021c344SAndy King * Software Foundation version 2 and no later version. 9d021c344SAndy King * 10d021c344SAndy King * This program is distributed in the hope that it will be useful, but WITHOUT 11d021c344SAndy King * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12d021c344SAndy King * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 13d021c344SAndy King * more details. 14d021c344SAndy King */ 15d021c344SAndy King 16d021c344SAndy King /* Implementation notes: 17d021c344SAndy King * 18d021c344SAndy King * - There are two kinds of sockets: those created by user action (such as 19d021c344SAndy King * calling socket(2)) and those created by incoming connection request packets. 20d021c344SAndy King * 21d021c344SAndy King * - There are two "global" tables, one for bound sockets (sockets that have 22d021c344SAndy King * specified an address that they are responsible for) and one for connected 23d021c344SAndy King * sockets (sockets that have established a connection with another socket). 24d021c344SAndy King * These tables are "global" in that all sockets on the system are placed 25d021c344SAndy King * within them. - Note, though, that the bound table contains an extra entry 26d021c344SAndy King * for a list of unbound sockets and SOCK_DGRAM sockets will always remain in 27d021c344SAndy King * that list. The bound table is used solely for lookup of sockets when packets 28d021c344SAndy King * are received and that's not necessary for SOCK_DGRAM sockets since we create 29d021c344SAndy King * a datagram handle for each and need not perform a lookup. Keeping SOCK_DGRAM 30d021c344SAndy King * sockets out of the bound hash buckets will reduce the chance of collisions 31d021c344SAndy King * when looking for SOCK_STREAM sockets and prevents us from having to check the 32d021c344SAndy King * socket type in the hash table lookups. 33d021c344SAndy King * 34d021c344SAndy King * - Sockets created by user action will either be "client" sockets that 35d021c344SAndy King * initiate a connection or "server" sockets that listen for connections; we do 36d021c344SAndy King * not support simultaneous connects (two "client" sockets connecting). 37d021c344SAndy King * 38d021c344SAndy King * - "Server" sockets are referred to as listener sockets throughout this 39ea3803c1SStefan Hajnoczi * implementation because they are in the VSOCK_SS_LISTEN state. When a 40ea3803c1SStefan Hajnoczi * connection request is received (the second kind of socket mentioned above), 41ea3803c1SStefan Hajnoczi * we create a new socket and refer to it as a pending socket. These pending 42ea3803c1SStefan Hajnoczi * sockets are placed on the pending connection list of the listener socket. 43ea3803c1SStefan Hajnoczi * When future packets are received for the address the listener socket is 44ea3803c1SStefan Hajnoczi * bound to, we check if the source of the packet is from one that has an 45ea3803c1SStefan Hajnoczi * existing pending connection. If it does, we process the packet for the 46ea3803c1SStefan Hajnoczi * pending socket. When that socket reaches the connected state, it is removed 47ea3803c1SStefan Hajnoczi * from the listener socket's pending list and enqueued in the listener 48ea3803c1SStefan Hajnoczi * socket's accept queue. Callers of accept(2) will accept connected sockets 49ea3803c1SStefan Hajnoczi * from the listener socket's accept queue. If the socket cannot be accepted 50ea3803c1SStefan Hajnoczi * for some reason then it is marked rejected. Once the connection is 51ea3803c1SStefan Hajnoczi * accepted, it is owned by the user process and the responsibility for cleanup 52ea3803c1SStefan Hajnoczi * falls with that user process. 53d021c344SAndy King * 54d021c344SAndy King * - It is possible that these pending sockets will never reach the connected 55d021c344SAndy King * state; in fact, we may never receive another packet after the connection 56d021c344SAndy King * request. Because of this, we must schedule a cleanup function to run in the 57d021c344SAndy King * future, after some amount of time passes where a connection should have been 58d021c344SAndy King * established. This function ensures that the socket is off all lists so it 59d021c344SAndy King * cannot be retrieved, then drops all references to the socket so it is cleaned 60d021c344SAndy King * up (sock_put() -> sk_free() -> our sk_destruct implementation). Note this 61d021c344SAndy King * function will also cleanup rejected sockets, those that reach the connected 62d021c344SAndy King * state but leave it before they have been accepted. 63d021c344SAndy King * 644192f672SStefan Hajnoczi * - Lock ordering for pending or accept queue sockets is: 654192f672SStefan Hajnoczi * 664192f672SStefan Hajnoczi * lock_sock(listener); 674192f672SStefan Hajnoczi * lock_sock_nested(pending, SINGLE_DEPTH_NESTING); 684192f672SStefan Hajnoczi * 694192f672SStefan Hajnoczi * Using explicit nested locking keeps lockdep happy since normally only one 704192f672SStefan Hajnoczi * lock of a given class may be taken at a time. 714192f672SStefan Hajnoczi * 72d021c344SAndy King * - Sockets created by user action will be cleaned up when the user process 73d021c344SAndy King * calls close(2), causing our release implementation to be called. Our release 74d021c344SAndy King * implementation will perform some cleanup then drop the last reference so our 75d021c344SAndy King * sk_destruct implementation is invoked. Our sk_destruct implementation will 76d021c344SAndy King * perform additional cleanup that's common for both types of sockets. 77d021c344SAndy King * 78d021c344SAndy King * - A socket's reference count is what ensures that the structure won't be 79d021c344SAndy King * freed. Each entry in a list (such as the "global" bound and connected tables 80d021c344SAndy King * and the listener socket's pending list and connected queue) ensures a 81d021c344SAndy King * reference. When we defer work until process context and pass a socket as our 82d021c344SAndy King * argument, we must ensure the reference count is increased to ensure the 83d021c344SAndy King * socket isn't freed before the function is run; the deferred function will 84d021c344SAndy King * then drop the reference. 85d021c344SAndy King */ 86d021c344SAndy King 87d021c344SAndy King #include <linux/types.h> 88d021c344SAndy King #include <linux/bitops.h> 89d021c344SAndy King #include <linux/cred.h> 90d021c344SAndy King #include <linux/init.h> 91d021c344SAndy King #include <linux/io.h> 92d021c344SAndy King #include <linux/kernel.h> 93d021c344SAndy King #include <linux/kmod.h> 94d021c344SAndy King #include <linux/list.h> 95d021c344SAndy King #include <linux/miscdevice.h> 96d021c344SAndy King #include <linux/module.h> 97d021c344SAndy King #include <linux/mutex.h> 98d021c344SAndy King #include <linux/net.h> 99d021c344SAndy King #include <linux/poll.h> 100d021c344SAndy King #include <linux/skbuff.h> 101d021c344SAndy King #include <linux/smp.h> 102d021c344SAndy King #include <linux/socket.h> 103d021c344SAndy King #include <linux/stddef.h> 104d021c344SAndy King #include <linux/unistd.h> 105d021c344SAndy King #include <linux/wait.h> 106d021c344SAndy King #include <linux/workqueue.h> 107d021c344SAndy King #include <net/sock.h> 10882a54d0eSAsias He #include <net/af_vsock.h> 109d021c344SAndy King 110d021c344SAndy King static int __vsock_bind(struct sock *sk, struct sockaddr_vm *addr); 111d021c344SAndy King static void vsock_sk_destruct(struct sock *sk); 112d021c344SAndy King static int vsock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb); 113d021c344SAndy King 114d021c344SAndy King /* Protocol family. */ 115d021c344SAndy King static struct proto vsock_proto = { 116d021c344SAndy King .name = "AF_VSOCK", 117d021c344SAndy King .owner = THIS_MODULE, 118d021c344SAndy King .obj_size = sizeof(struct vsock_sock), 119d021c344SAndy King }; 120d021c344SAndy King 121d021c344SAndy King /* The default peer timeout indicates how long we will wait for a peer response 122d021c344SAndy King * to a control message. 123d021c344SAndy King */ 124d021c344SAndy King #define VSOCK_DEFAULT_CONNECT_TIMEOUT (2 * HZ) 125d021c344SAndy King 126d021c344SAndy King static const struct vsock_transport *transport; 127d021c344SAndy King static DEFINE_MUTEX(vsock_register_mutex); 128d021c344SAndy King 129d021c344SAndy King /**** EXPORTS ****/ 130d021c344SAndy King 131d021c344SAndy King /* Get the ID of the local context. This is transport dependent. */ 132d021c344SAndy King 133d021c344SAndy King int vm_sockets_get_local_cid(void) 134d021c344SAndy King { 135d021c344SAndy King return transport->get_local_cid(); 136d021c344SAndy King } 137d021c344SAndy King EXPORT_SYMBOL_GPL(vm_sockets_get_local_cid); 138d021c344SAndy King 139d021c344SAndy King /**** UTILS ****/ 140d021c344SAndy King 141d021c344SAndy King /* Each bound VSocket is stored in the bind hash table and each connected 142d021c344SAndy King * VSocket is stored in the connected hash table. 143d021c344SAndy King * 144d021c344SAndy King * Unbound sockets are all put on the same list attached to the end of the hash 145d021c344SAndy King * table (vsock_unbound_sockets). Bound sockets are added to the hash table in 146d021c344SAndy King * the bucket that their local address hashes to (vsock_bound_sockets(addr) 147d021c344SAndy King * represents the list that addr hashes to). 148d021c344SAndy King * 149d021c344SAndy King * Specifically, we initialize the vsock_bind_table array to a size of 150d021c344SAndy King * VSOCK_HASH_SIZE + 1 so that vsock_bind_table[0] through 151d021c344SAndy King * vsock_bind_table[VSOCK_HASH_SIZE - 1] are for bound sockets and 152d021c344SAndy King * vsock_bind_table[VSOCK_HASH_SIZE] is for unbound sockets. The hash function 153a49dd9dcSAsias He * mods with VSOCK_HASH_SIZE to ensure this. 154d021c344SAndy King */ 155d021c344SAndy King #define VSOCK_HASH_SIZE 251 156d021c344SAndy King #define MAX_PORT_RETRIES 24 157d021c344SAndy King 158a49dd9dcSAsias He #define VSOCK_HASH(addr) ((addr)->svm_port % VSOCK_HASH_SIZE) 159d021c344SAndy King #define vsock_bound_sockets(addr) (&vsock_bind_table[VSOCK_HASH(addr)]) 160d021c344SAndy King #define vsock_unbound_sockets (&vsock_bind_table[VSOCK_HASH_SIZE]) 161d021c344SAndy King 162d021c344SAndy King /* XXX This can probably be implemented in a better way. */ 163d021c344SAndy King #define VSOCK_CONN_HASH(src, dst) \ 164a49dd9dcSAsias He (((src)->svm_cid ^ (dst)->svm_port) % VSOCK_HASH_SIZE) 165d021c344SAndy King #define vsock_connected_sockets(src, dst) \ 166d021c344SAndy King (&vsock_connected_table[VSOCK_CONN_HASH(src, dst)]) 167d021c344SAndy King #define vsock_connected_sockets_vsk(vsk) \ 168d021c344SAndy King vsock_connected_sockets(&(vsk)->remote_addr, &(vsk)->local_addr) 169d021c344SAndy King 170d021c344SAndy King static struct list_head vsock_bind_table[VSOCK_HASH_SIZE + 1]; 171d021c344SAndy King static struct list_head vsock_connected_table[VSOCK_HASH_SIZE]; 172d021c344SAndy King static DEFINE_SPINLOCK(vsock_table_lock); 173d021c344SAndy King 174b3a6dfe8SAsias He /* Autobind this socket to the local address if necessary. */ 175b3a6dfe8SAsias He static int vsock_auto_bind(struct vsock_sock *vsk) 176b3a6dfe8SAsias He { 177b3a6dfe8SAsias He struct sock *sk = sk_vsock(vsk); 178b3a6dfe8SAsias He struct sockaddr_vm local_addr; 179b3a6dfe8SAsias He 180b3a6dfe8SAsias He if (vsock_addr_bound(&vsk->local_addr)) 181b3a6dfe8SAsias He return 0; 182b3a6dfe8SAsias He vsock_addr_init(&local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); 183b3a6dfe8SAsias He return __vsock_bind(sk, &local_addr); 184b3a6dfe8SAsias He } 185b3a6dfe8SAsias He 18622ee3b57SGeert Uytterhoeven static void vsock_init_tables(void) 187d021c344SAndy King { 188d021c344SAndy King int i; 189d021c344SAndy King 190d021c344SAndy King for (i = 0; i < ARRAY_SIZE(vsock_bind_table); i++) 191d021c344SAndy King INIT_LIST_HEAD(&vsock_bind_table[i]); 192d021c344SAndy King 193d021c344SAndy King for (i = 0; i < ARRAY_SIZE(vsock_connected_table); i++) 194d021c344SAndy King INIT_LIST_HEAD(&vsock_connected_table[i]); 195d021c344SAndy King } 196d021c344SAndy King 197d021c344SAndy King static void __vsock_insert_bound(struct list_head *list, 198d021c344SAndy King struct vsock_sock *vsk) 199d021c344SAndy King { 200d021c344SAndy King sock_hold(&vsk->sk); 201d021c344SAndy King list_add(&vsk->bound_table, list); 202d021c344SAndy King } 203d021c344SAndy King 204d021c344SAndy King static void __vsock_insert_connected(struct list_head *list, 205d021c344SAndy King struct vsock_sock *vsk) 206d021c344SAndy King { 207d021c344SAndy King sock_hold(&vsk->sk); 208d021c344SAndy King list_add(&vsk->connected_table, list); 209d021c344SAndy King } 210d021c344SAndy King 211d021c344SAndy King static void __vsock_remove_bound(struct vsock_sock *vsk) 212d021c344SAndy King { 213d021c344SAndy King list_del_init(&vsk->bound_table); 214d021c344SAndy King sock_put(&vsk->sk); 215d021c344SAndy King } 216d021c344SAndy King 217d021c344SAndy King static void __vsock_remove_connected(struct vsock_sock *vsk) 218d021c344SAndy King { 219d021c344SAndy King list_del_init(&vsk->connected_table); 220d021c344SAndy King sock_put(&vsk->sk); 221d021c344SAndy King } 222d021c344SAndy King 223d021c344SAndy King static struct sock *__vsock_find_bound_socket(struct sockaddr_vm *addr) 224d021c344SAndy King { 225d021c344SAndy King struct vsock_sock *vsk; 226d021c344SAndy King 227d021c344SAndy King list_for_each_entry(vsk, vsock_bound_sockets(addr), bound_table) 228990454b5SReilly Grant if (addr->svm_port == vsk->local_addr.svm_port) 229d021c344SAndy King return sk_vsock(vsk); 230d021c344SAndy King 231d021c344SAndy King return NULL; 232d021c344SAndy King } 233d021c344SAndy King 234d021c344SAndy King static struct sock *__vsock_find_connected_socket(struct sockaddr_vm *src, 235d021c344SAndy King struct sockaddr_vm *dst) 236d021c344SAndy King { 237d021c344SAndy King struct vsock_sock *vsk; 238d021c344SAndy King 239d021c344SAndy King list_for_each_entry(vsk, vsock_connected_sockets(src, dst), 240d021c344SAndy King connected_table) { 241990454b5SReilly Grant if (vsock_addr_equals_addr(src, &vsk->remote_addr) && 242990454b5SReilly Grant dst->svm_port == vsk->local_addr.svm_port) { 243d021c344SAndy King return sk_vsock(vsk); 244d021c344SAndy King } 245d021c344SAndy King } 246d021c344SAndy King 247d021c344SAndy King return NULL; 248d021c344SAndy King } 249d021c344SAndy King 250d021c344SAndy King static bool __vsock_in_bound_table(struct vsock_sock *vsk) 251d021c344SAndy King { 252d021c344SAndy King return !list_empty(&vsk->bound_table); 253d021c344SAndy King } 254d021c344SAndy King 255d021c344SAndy King static bool __vsock_in_connected_table(struct vsock_sock *vsk) 256d021c344SAndy King { 257d021c344SAndy King return !list_empty(&vsk->connected_table); 258d021c344SAndy King } 259d021c344SAndy King 260d021c344SAndy King static void vsock_insert_unbound(struct vsock_sock *vsk) 261d021c344SAndy King { 262d021c344SAndy King spin_lock_bh(&vsock_table_lock); 263d021c344SAndy King __vsock_insert_bound(vsock_unbound_sockets, vsk); 264d021c344SAndy King spin_unlock_bh(&vsock_table_lock); 265d021c344SAndy King } 266d021c344SAndy King 267d021c344SAndy King void vsock_insert_connected(struct vsock_sock *vsk) 268d021c344SAndy King { 269d021c344SAndy King struct list_head *list = vsock_connected_sockets( 270d021c344SAndy King &vsk->remote_addr, &vsk->local_addr); 271d021c344SAndy King 272d021c344SAndy King spin_lock_bh(&vsock_table_lock); 273d021c344SAndy King __vsock_insert_connected(list, vsk); 274d021c344SAndy King spin_unlock_bh(&vsock_table_lock); 275d021c344SAndy King } 276d021c344SAndy King EXPORT_SYMBOL_GPL(vsock_insert_connected); 277d021c344SAndy King 278d021c344SAndy King void vsock_remove_bound(struct vsock_sock *vsk) 279d021c344SAndy King { 280d021c344SAndy King spin_lock_bh(&vsock_table_lock); 281d021c344SAndy King __vsock_remove_bound(vsk); 282d021c344SAndy King spin_unlock_bh(&vsock_table_lock); 283d021c344SAndy King } 284d021c344SAndy King EXPORT_SYMBOL_GPL(vsock_remove_bound); 285d021c344SAndy King 286d021c344SAndy King void vsock_remove_connected(struct vsock_sock *vsk) 287d021c344SAndy King { 288d021c344SAndy King spin_lock_bh(&vsock_table_lock); 289d021c344SAndy King __vsock_remove_connected(vsk); 290d021c344SAndy King spin_unlock_bh(&vsock_table_lock); 291d021c344SAndy King } 292d021c344SAndy King EXPORT_SYMBOL_GPL(vsock_remove_connected); 293d021c344SAndy King 294d021c344SAndy King struct sock *vsock_find_bound_socket(struct sockaddr_vm *addr) 295d021c344SAndy King { 296d021c344SAndy King struct sock *sk; 297d021c344SAndy King 298d021c344SAndy King spin_lock_bh(&vsock_table_lock); 299d021c344SAndy King sk = __vsock_find_bound_socket(addr); 300d021c344SAndy King if (sk) 301d021c344SAndy King sock_hold(sk); 302d021c344SAndy King 303d021c344SAndy King spin_unlock_bh(&vsock_table_lock); 304d021c344SAndy King 305d021c344SAndy King return sk; 306d021c344SAndy King } 307d021c344SAndy King EXPORT_SYMBOL_GPL(vsock_find_bound_socket); 308d021c344SAndy King 309d021c344SAndy King struct sock *vsock_find_connected_socket(struct sockaddr_vm *src, 310d021c344SAndy King struct sockaddr_vm *dst) 311d021c344SAndy King { 312d021c344SAndy King struct sock *sk; 313d021c344SAndy King 314d021c344SAndy King spin_lock_bh(&vsock_table_lock); 315d021c344SAndy King sk = __vsock_find_connected_socket(src, dst); 316d021c344SAndy King if (sk) 317d021c344SAndy King sock_hold(sk); 318d021c344SAndy King 319d021c344SAndy King spin_unlock_bh(&vsock_table_lock); 320d021c344SAndy King 321d021c344SAndy King return sk; 322d021c344SAndy King } 323d021c344SAndy King EXPORT_SYMBOL_GPL(vsock_find_connected_socket); 324d021c344SAndy King 325d021c344SAndy King static bool vsock_in_bound_table(struct vsock_sock *vsk) 326d021c344SAndy King { 327d021c344SAndy King bool ret; 328d021c344SAndy King 329d021c344SAndy King spin_lock_bh(&vsock_table_lock); 330d021c344SAndy King ret = __vsock_in_bound_table(vsk); 331d021c344SAndy King spin_unlock_bh(&vsock_table_lock); 332d021c344SAndy King 333d021c344SAndy King return ret; 334d021c344SAndy King } 335d021c344SAndy King 336d021c344SAndy King static bool vsock_in_connected_table(struct vsock_sock *vsk) 337d021c344SAndy King { 338d021c344SAndy King bool ret; 339d021c344SAndy King 340d021c344SAndy King spin_lock_bh(&vsock_table_lock); 341d021c344SAndy King ret = __vsock_in_connected_table(vsk); 342d021c344SAndy King spin_unlock_bh(&vsock_table_lock); 343d021c344SAndy King 344d021c344SAndy King return ret; 345d021c344SAndy King } 346d021c344SAndy King 3476773b7dcSStefan Hajnoczi void vsock_remove_sock(struct vsock_sock *vsk) 3486773b7dcSStefan Hajnoczi { 3496773b7dcSStefan Hajnoczi if (vsock_in_bound_table(vsk)) 3506773b7dcSStefan Hajnoczi vsock_remove_bound(vsk); 3516773b7dcSStefan Hajnoczi 3526773b7dcSStefan Hajnoczi if (vsock_in_connected_table(vsk)) 3536773b7dcSStefan Hajnoczi vsock_remove_connected(vsk); 3546773b7dcSStefan Hajnoczi } 3556773b7dcSStefan Hajnoczi EXPORT_SYMBOL_GPL(vsock_remove_sock); 3566773b7dcSStefan Hajnoczi 357d021c344SAndy King void vsock_for_each_connected_socket(void (*fn)(struct sock *sk)) 358d021c344SAndy King { 359d021c344SAndy King int i; 360d021c344SAndy King 361d021c344SAndy King spin_lock_bh(&vsock_table_lock); 362d021c344SAndy King 363d021c344SAndy King for (i = 0; i < ARRAY_SIZE(vsock_connected_table); i++) { 364d021c344SAndy King struct vsock_sock *vsk; 365d021c344SAndy King list_for_each_entry(vsk, &vsock_connected_table[i], 366d9af2d67SJulia Lawall connected_table) 367d021c344SAndy King fn(sk_vsock(vsk)); 368d021c344SAndy King } 369d021c344SAndy King 370d021c344SAndy King spin_unlock_bh(&vsock_table_lock); 371d021c344SAndy King } 372d021c344SAndy King EXPORT_SYMBOL_GPL(vsock_for_each_connected_socket); 373d021c344SAndy King 374d021c344SAndy King void vsock_add_pending(struct sock *listener, struct sock *pending) 375d021c344SAndy King { 376d021c344SAndy King struct vsock_sock *vlistener; 377d021c344SAndy King struct vsock_sock *vpending; 378d021c344SAndy King 379d021c344SAndy King vlistener = vsock_sk(listener); 380d021c344SAndy King vpending = vsock_sk(pending); 381d021c344SAndy King 382d021c344SAndy King sock_hold(pending); 383d021c344SAndy King sock_hold(listener); 384d021c344SAndy King list_add_tail(&vpending->pending_links, &vlistener->pending_links); 385d021c344SAndy King } 386d021c344SAndy King EXPORT_SYMBOL_GPL(vsock_add_pending); 387d021c344SAndy King 388d021c344SAndy King void vsock_remove_pending(struct sock *listener, struct sock *pending) 389d021c344SAndy King { 390d021c344SAndy King struct vsock_sock *vpending = vsock_sk(pending); 391d021c344SAndy King 392d021c344SAndy King list_del_init(&vpending->pending_links); 393d021c344SAndy King sock_put(listener); 394d021c344SAndy King sock_put(pending); 395d021c344SAndy King } 396d021c344SAndy King EXPORT_SYMBOL_GPL(vsock_remove_pending); 397d021c344SAndy King 398d021c344SAndy King void vsock_enqueue_accept(struct sock *listener, struct sock *connected) 399d021c344SAndy King { 400d021c344SAndy King struct vsock_sock *vlistener; 401d021c344SAndy King struct vsock_sock *vconnected; 402d021c344SAndy King 403d021c344SAndy King vlistener = vsock_sk(listener); 404d021c344SAndy King vconnected = vsock_sk(connected); 405d021c344SAndy King 406d021c344SAndy King sock_hold(connected); 407d021c344SAndy King sock_hold(listener); 408d021c344SAndy King list_add_tail(&vconnected->accept_queue, &vlistener->accept_queue); 409d021c344SAndy King } 410d021c344SAndy King EXPORT_SYMBOL_GPL(vsock_enqueue_accept); 411d021c344SAndy King 412d021c344SAndy King static struct sock *vsock_dequeue_accept(struct sock *listener) 413d021c344SAndy King { 414d021c344SAndy King struct vsock_sock *vlistener; 415d021c344SAndy King struct vsock_sock *vconnected; 416d021c344SAndy King 417d021c344SAndy King vlistener = vsock_sk(listener); 418d021c344SAndy King 419d021c344SAndy King if (list_empty(&vlistener->accept_queue)) 420d021c344SAndy King return NULL; 421d021c344SAndy King 422d021c344SAndy King vconnected = list_entry(vlistener->accept_queue.next, 423d021c344SAndy King struct vsock_sock, accept_queue); 424d021c344SAndy King 425d021c344SAndy King list_del_init(&vconnected->accept_queue); 426d021c344SAndy King sock_put(listener); 427d021c344SAndy King /* The caller will need a reference on the connected socket so we let 428d021c344SAndy King * it call sock_put(). 429d021c344SAndy King */ 430d021c344SAndy King 431d021c344SAndy King return sk_vsock(vconnected); 432d021c344SAndy King } 433d021c344SAndy King 434d021c344SAndy King static bool vsock_is_accept_queue_empty(struct sock *sk) 435d021c344SAndy King { 436d021c344SAndy King struct vsock_sock *vsk = vsock_sk(sk); 437d021c344SAndy King return list_empty(&vsk->accept_queue); 438d021c344SAndy King } 439d021c344SAndy King 440d021c344SAndy King static bool vsock_is_pending(struct sock *sk) 441d021c344SAndy King { 442d021c344SAndy King struct vsock_sock *vsk = vsock_sk(sk); 443d021c344SAndy King return !list_empty(&vsk->pending_links); 444d021c344SAndy King } 445d021c344SAndy King 446d021c344SAndy King static int vsock_send_shutdown(struct sock *sk, int mode) 447d021c344SAndy King { 448d021c344SAndy King return transport->shutdown(vsock_sk(sk), mode); 449d021c344SAndy King } 450d021c344SAndy King 451d021c344SAndy King void vsock_pending_work(struct work_struct *work) 452d021c344SAndy King { 453d021c344SAndy King struct sock *sk; 454d021c344SAndy King struct sock *listener; 455d021c344SAndy King struct vsock_sock *vsk; 456d021c344SAndy King bool cleanup; 457d021c344SAndy King 458d021c344SAndy King vsk = container_of(work, struct vsock_sock, dwork.work); 459d021c344SAndy King sk = sk_vsock(vsk); 460d021c344SAndy King listener = vsk->listener; 461d021c344SAndy King cleanup = true; 462d021c344SAndy King 463d021c344SAndy King lock_sock(listener); 4644192f672SStefan Hajnoczi lock_sock_nested(sk, SINGLE_DEPTH_NESTING); 465d021c344SAndy King 466d021c344SAndy King if (vsock_is_pending(sk)) { 467d021c344SAndy King vsock_remove_pending(listener, sk); 468d021c344SAndy King } else if (!vsk->rejected) { 469d021c344SAndy King /* We are not on the pending list and accept() did not reject 470d021c344SAndy King * us, so we must have been accepted by our user process. We 471d021c344SAndy King * just need to drop our references to the sockets and be on 472d021c344SAndy King * our way. 473d021c344SAndy King */ 474d021c344SAndy King cleanup = false; 475d021c344SAndy King goto out; 476d021c344SAndy King } 477d021c344SAndy King 478d021c344SAndy King listener->sk_ack_backlog--; 479d021c344SAndy King 480d021c344SAndy King /* We need to remove ourself from the global connected sockets list so 481d021c344SAndy King * incoming packets can't find this socket, and to reduce the reference 482d021c344SAndy King * count. 483d021c344SAndy King */ 484d021c344SAndy King if (vsock_in_connected_table(vsk)) 485d021c344SAndy King vsock_remove_connected(vsk); 486d021c344SAndy King 487d021c344SAndy King sk->sk_state = SS_FREE; 488d021c344SAndy King 489d021c344SAndy King out: 490d021c344SAndy King release_sock(sk); 491d021c344SAndy King release_sock(listener); 492d021c344SAndy King if (cleanup) 493d021c344SAndy King sock_put(sk); 494d021c344SAndy King 495d021c344SAndy King sock_put(sk); 496d021c344SAndy King sock_put(listener); 497d021c344SAndy King } 498d021c344SAndy King EXPORT_SYMBOL_GPL(vsock_pending_work); 499d021c344SAndy King 500d021c344SAndy King /**** SOCKET OPERATIONS ****/ 501d021c344SAndy King 502d021c344SAndy King static int __vsock_bind_stream(struct vsock_sock *vsk, 503d021c344SAndy King struct sockaddr_vm *addr) 504d021c344SAndy King { 505d021c344SAndy King static u32 port = LAST_RESERVED_PORT + 1; 506d021c344SAndy King struct sockaddr_vm new_addr; 507d021c344SAndy King 508d021c344SAndy King vsock_addr_init(&new_addr, addr->svm_cid, addr->svm_port); 509d021c344SAndy King 510d021c344SAndy King if (addr->svm_port == VMADDR_PORT_ANY) { 511d021c344SAndy King bool found = false; 512d021c344SAndy King unsigned int i; 513d021c344SAndy King 514d021c344SAndy King for (i = 0; i < MAX_PORT_RETRIES; i++) { 515d021c344SAndy King if (port <= LAST_RESERVED_PORT) 516d021c344SAndy King port = LAST_RESERVED_PORT + 1; 517d021c344SAndy King 518d021c344SAndy King new_addr.svm_port = port++; 519d021c344SAndy King 520d021c344SAndy King if (!__vsock_find_bound_socket(&new_addr)) { 521d021c344SAndy King found = true; 522d021c344SAndy King break; 523d021c344SAndy King } 524d021c344SAndy King } 525d021c344SAndy King 526d021c344SAndy King if (!found) 527d021c344SAndy King return -EADDRNOTAVAIL; 528d021c344SAndy King } else { 529d021c344SAndy King /* If port is in reserved range, ensure caller 530d021c344SAndy King * has necessary privileges. 531d021c344SAndy King */ 532d021c344SAndy King if (addr->svm_port <= LAST_RESERVED_PORT && 533d021c344SAndy King !capable(CAP_NET_BIND_SERVICE)) { 534d021c344SAndy King return -EACCES; 535d021c344SAndy King } 536d021c344SAndy King 537d021c344SAndy King if (__vsock_find_bound_socket(&new_addr)) 538d021c344SAndy King return -EADDRINUSE; 539d021c344SAndy King } 540d021c344SAndy King 541d021c344SAndy King vsock_addr_init(&vsk->local_addr, new_addr.svm_cid, new_addr.svm_port); 542d021c344SAndy King 543d021c344SAndy King /* Remove stream sockets from the unbound list and add them to the hash 544d021c344SAndy King * table for easy lookup by its address. The unbound list is simply an 545d021c344SAndy King * extra entry at the end of the hash table, a trick used by AF_UNIX. 546d021c344SAndy King */ 547d021c344SAndy King __vsock_remove_bound(vsk); 548d021c344SAndy King __vsock_insert_bound(vsock_bound_sockets(&vsk->local_addr), vsk); 549d021c344SAndy King 550d021c344SAndy King return 0; 551d021c344SAndy King } 552d021c344SAndy King 553d021c344SAndy King static int __vsock_bind_dgram(struct vsock_sock *vsk, 554d021c344SAndy King struct sockaddr_vm *addr) 555d021c344SAndy King { 556d021c344SAndy King return transport->dgram_bind(vsk, addr); 557d021c344SAndy King } 558d021c344SAndy King 559d021c344SAndy King static int __vsock_bind(struct sock *sk, struct sockaddr_vm *addr) 560d021c344SAndy King { 561d021c344SAndy King struct vsock_sock *vsk = vsock_sk(sk); 562d021c344SAndy King u32 cid; 563d021c344SAndy King int retval; 564d021c344SAndy King 565d021c344SAndy King /* First ensure this socket isn't already bound. */ 566d021c344SAndy King if (vsock_addr_bound(&vsk->local_addr)) 567d021c344SAndy King return -EINVAL; 568d021c344SAndy King 569d021c344SAndy King /* Now bind to the provided address or select appropriate values if 570d021c344SAndy King * none are provided (VMADDR_CID_ANY and VMADDR_PORT_ANY). Note that 571d021c344SAndy King * like AF_INET prevents binding to a non-local IP address (in most 572d021c344SAndy King * cases), we only allow binding to the local CID. 573d021c344SAndy King */ 574d021c344SAndy King cid = transport->get_local_cid(); 575d021c344SAndy King if (addr->svm_cid != cid && addr->svm_cid != VMADDR_CID_ANY) 576d021c344SAndy King return -EADDRNOTAVAIL; 577d021c344SAndy King 578d021c344SAndy King switch (sk->sk_socket->type) { 579d021c344SAndy King case SOCK_STREAM: 580d021c344SAndy King spin_lock_bh(&vsock_table_lock); 581d021c344SAndy King retval = __vsock_bind_stream(vsk, addr); 582d021c344SAndy King spin_unlock_bh(&vsock_table_lock); 583d021c344SAndy King break; 584d021c344SAndy King 585d021c344SAndy King case SOCK_DGRAM: 586d021c344SAndy King retval = __vsock_bind_dgram(vsk, addr); 587d021c344SAndy King break; 588d021c344SAndy King 589d021c344SAndy King default: 590d021c344SAndy King retval = -EINVAL; 591d021c344SAndy King break; 592d021c344SAndy King } 593d021c344SAndy King 594d021c344SAndy King return retval; 595d021c344SAndy King } 596d021c344SAndy King 597d021c344SAndy King struct sock *__vsock_create(struct net *net, 598d021c344SAndy King struct socket *sock, 599d021c344SAndy King struct sock *parent, 600d021c344SAndy King gfp_t priority, 60111aa9c28SEric W. Biederman unsigned short type, 60211aa9c28SEric W. Biederman int kern) 603d021c344SAndy King { 604d021c344SAndy King struct sock *sk; 605d021c344SAndy King struct vsock_sock *psk; 606d021c344SAndy King struct vsock_sock *vsk; 607d021c344SAndy King 60811aa9c28SEric W. Biederman sk = sk_alloc(net, AF_VSOCK, priority, &vsock_proto, kern); 609d021c344SAndy King if (!sk) 610d021c344SAndy King return NULL; 611d021c344SAndy King 612d021c344SAndy King sock_init_data(sock, sk); 613d021c344SAndy King 614d021c344SAndy King /* sk->sk_type is normally set in sock_init_data, but only if sock is 615d021c344SAndy King * non-NULL. We make sure that our sockets always have a type by 616d021c344SAndy King * setting it here if needed. 617d021c344SAndy King */ 618d021c344SAndy King if (!sock) 619d021c344SAndy King sk->sk_type = type; 620d021c344SAndy King 621d021c344SAndy King vsk = vsock_sk(sk); 622d021c344SAndy King vsock_addr_init(&vsk->local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); 623d021c344SAndy King vsock_addr_init(&vsk->remote_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); 624d021c344SAndy King 625d021c344SAndy King sk->sk_destruct = vsock_sk_destruct; 626d021c344SAndy King sk->sk_backlog_rcv = vsock_queue_rcv_skb; 627d021c344SAndy King sk->sk_state = 0; 628d021c344SAndy King sock_reset_flag(sk, SOCK_DONE); 629d021c344SAndy King 630d021c344SAndy King INIT_LIST_HEAD(&vsk->bound_table); 631d021c344SAndy King INIT_LIST_HEAD(&vsk->connected_table); 632d021c344SAndy King vsk->listener = NULL; 633d021c344SAndy King INIT_LIST_HEAD(&vsk->pending_links); 634d021c344SAndy King INIT_LIST_HEAD(&vsk->accept_queue); 635d021c344SAndy King vsk->rejected = false; 636d021c344SAndy King vsk->sent_request = false; 637d021c344SAndy King vsk->ignore_connecting_rst = false; 638d021c344SAndy King vsk->peer_shutdown = 0; 639d021c344SAndy King 640d021c344SAndy King psk = parent ? vsock_sk(parent) : NULL; 641d021c344SAndy King if (parent) { 642d021c344SAndy King vsk->trusted = psk->trusted; 643d021c344SAndy King vsk->owner = get_cred(psk->owner); 644d021c344SAndy King vsk->connect_timeout = psk->connect_timeout; 645d021c344SAndy King } else { 646d021c344SAndy King vsk->trusted = capable(CAP_NET_ADMIN); 647d021c344SAndy King vsk->owner = get_current_cred(); 648d021c344SAndy King vsk->connect_timeout = VSOCK_DEFAULT_CONNECT_TIMEOUT; 649d021c344SAndy King } 650d021c344SAndy King 651d021c344SAndy King if (transport->init(vsk, psk) < 0) { 652d021c344SAndy King sk_free(sk); 653d021c344SAndy King return NULL; 654d021c344SAndy King } 655d021c344SAndy King 656d021c344SAndy King if (sock) 657d021c344SAndy King vsock_insert_unbound(vsk); 658d021c344SAndy King 659d021c344SAndy King return sk; 660d021c344SAndy King } 661d021c344SAndy King EXPORT_SYMBOL_GPL(__vsock_create); 662d021c344SAndy King 663d021c344SAndy King static void __vsock_release(struct sock *sk) 664d021c344SAndy King { 665d021c344SAndy King if (sk) { 666d021c344SAndy King struct sk_buff *skb; 667d021c344SAndy King struct sock *pending; 668d021c344SAndy King struct vsock_sock *vsk; 669d021c344SAndy King 670d021c344SAndy King vsk = vsock_sk(sk); 671d021c344SAndy King pending = NULL; /* Compiler warning. */ 672d021c344SAndy King 673d021c344SAndy King transport->release(vsk); 674d021c344SAndy King 675d021c344SAndy King lock_sock(sk); 676d021c344SAndy King sock_orphan(sk); 677d021c344SAndy King sk->sk_shutdown = SHUTDOWN_MASK; 678d021c344SAndy King 679d021c344SAndy King while ((skb = skb_dequeue(&sk->sk_receive_queue))) 680d021c344SAndy King kfree_skb(skb); 681d021c344SAndy King 682d021c344SAndy King /* Clean up any sockets that never were accepted. */ 683d021c344SAndy King while ((pending = vsock_dequeue_accept(sk)) != NULL) { 684d021c344SAndy King __vsock_release(pending); 685d021c344SAndy King sock_put(pending); 686d021c344SAndy King } 687d021c344SAndy King 688d021c344SAndy King release_sock(sk); 689d021c344SAndy King sock_put(sk); 690d021c344SAndy King } 691d021c344SAndy King } 692d021c344SAndy King 693d021c344SAndy King static void vsock_sk_destruct(struct sock *sk) 694d021c344SAndy King { 695d021c344SAndy King struct vsock_sock *vsk = vsock_sk(sk); 696d021c344SAndy King 697d021c344SAndy King transport->destruct(vsk); 698d021c344SAndy King 699d021c344SAndy King /* When clearing these addresses, there's no need to set the family and 700d021c344SAndy King * possibly register the address family with the kernel. 701d021c344SAndy King */ 702d021c344SAndy King vsock_addr_init(&vsk->local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); 703d021c344SAndy King vsock_addr_init(&vsk->remote_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); 704d021c344SAndy King 705d021c344SAndy King put_cred(vsk->owner); 706d021c344SAndy King } 707d021c344SAndy King 708d021c344SAndy King static int vsock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 709d021c344SAndy King { 710d021c344SAndy King int err; 711d021c344SAndy King 712d021c344SAndy King err = sock_queue_rcv_skb(sk, skb); 713d021c344SAndy King if (err) 714d021c344SAndy King kfree_skb(skb); 715d021c344SAndy King 716d021c344SAndy King return err; 717d021c344SAndy King } 718d021c344SAndy King 719d021c344SAndy King s64 vsock_stream_has_data(struct vsock_sock *vsk) 720d021c344SAndy King { 721d021c344SAndy King return transport->stream_has_data(vsk); 722d021c344SAndy King } 723d021c344SAndy King EXPORT_SYMBOL_GPL(vsock_stream_has_data); 724d021c344SAndy King 725d021c344SAndy King s64 vsock_stream_has_space(struct vsock_sock *vsk) 726d021c344SAndy King { 727d021c344SAndy King return transport->stream_has_space(vsk); 728d021c344SAndy King } 729d021c344SAndy King EXPORT_SYMBOL_GPL(vsock_stream_has_space); 730d021c344SAndy King 731d021c344SAndy King static int vsock_release(struct socket *sock) 732d021c344SAndy King { 733d021c344SAndy King __vsock_release(sock->sk); 734d021c344SAndy King sock->sk = NULL; 735d021c344SAndy King sock->state = SS_FREE; 736d021c344SAndy King 737d021c344SAndy King return 0; 738d021c344SAndy King } 739d021c344SAndy King 740d021c344SAndy King static int 741d021c344SAndy King vsock_bind(struct socket *sock, struct sockaddr *addr, int addr_len) 742d021c344SAndy King { 743d021c344SAndy King int err; 744d021c344SAndy King struct sock *sk; 745d021c344SAndy King struct sockaddr_vm *vm_addr; 746d021c344SAndy King 747d021c344SAndy King sk = sock->sk; 748d021c344SAndy King 749d021c344SAndy King if (vsock_addr_cast(addr, addr_len, &vm_addr) != 0) 750d021c344SAndy King return -EINVAL; 751d021c344SAndy King 752d021c344SAndy King lock_sock(sk); 753d021c344SAndy King err = __vsock_bind(sk, vm_addr); 754d021c344SAndy King release_sock(sk); 755d021c344SAndy King 756d021c344SAndy King return err; 757d021c344SAndy King } 758d021c344SAndy King 759d021c344SAndy King static int vsock_getname(struct socket *sock, 760d021c344SAndy King struct sockaddr *addr, int *addr_len, int peer) 761d021c344SAndy King { 762d021c344SAndy King int err; 763d021c344SAndy King struct sock *sk; 764d021c344SAndy King struct vsock_sock *vsk; 765d021c344SAndy King struct sockaddr_vm *vm_addr; 766d021c344SAndy King 767d021c344SAndy King sk = sock->sk; 768d021c344SAndy King vsk = vsock_sk(sk); 769d021c344SAndy King err = 0; 770d021c344SAndy King 771d021c344SAndy King lock_sock(sk); 772d021c344SAndy King 773d021c344SAndy King if (peer) { 774d021c344SAndy King if (sock->state != SS_CONNECTED) { 775d021c344SAndy King err = -ENOTCONN; 776d021c344SAndy King goto out; 777d021c344SAndy King } 778d021c344SAndy King vm_addr = &vsk->remote_addr; 779d021c344SAndy King } else { 780d021c344SAndy King vm_addr = &vsk->local_addr; 781d021c344SAndy King } 782d021c344SAndy King 783d021c344SAndy King if (!vm_addr) { 784d021c344SAndy King err = -EINVAL; 785d021c344SAndy King goto out; 786d021c344SAndy King } 787d021c344SAndy King 788d021c344SAndy King /* sys_getsockname() and sys_getpeername() pass us a 789d021c344SAndy King * MAX_SOCK_ADDR-sized buffer and don't set addr_len. Unfortunately 790d021c344SAndy King * that macro is defined in socket.c instead of .h, so we hardcode its 791d021c344SAndy King * value here. 792d021c344SAndy King */ 793d021c344SAndy King BUILD_BUG_ON(sizeof(*vm_addr) > 128); 794d021c344SAndy King memcpy(addr, vm_addr, sizeof(*vm_addr)); 795d021c344SAndy King *addr_len = sizeof(*vm_addr); 796d021c344SAndy King 797d021c344SAndy King out: 798d021c344SAndy King release_sock(sk); 799d021c344SAndy King return err; 800d021c344SAndy King } 801d021c344SAndy King 802d021c344SAndy King static int vsock_shutdown(struct socket *sock, int mode) 803d021c344SAndy King { 804d021c344SAndy King int err; 805d021c344SAndy King struct sock *sk; 806d021c344SAndy King 807d021c344SAndy King /* User level uses SHUT_RD (0) and SHUT_WR (1), but the kernel uses 808d021c344SAndy King * RCV_SHUTDOWN (1) and SEND_SHUTDOWN (2), so we must increment mode 809d021c344SAndy King * here like the other address families do. Note also that the 810d021c344SAndy King * increment makes SHUT_RDWR (2) into RCV_SHUTDOWN | SEND_SHUTDOWN (3), 811d021c344SAndy King * which is what we want. 812d021c344SAndy King */ 813d021c344SAndy King mode++; 814d021c344SAndy King 815d021c344SAndy King if ((mode & ~SHUTDOWN_MASK) || !mode) 816d021c344SAndy King return -EINVAL; 817d021c344SAndy King 818d021c344SAndy King /* If this is a STREAM socket and it is not connected then bail out 819d021c344SAndy King * immediately. If it is a DGRAM socket then we must first kick the 820d021c344SAndy King * socket so that it wakes up from any sleeping calls, for example 821d021c344SAndy King * recv(), and then afterwards return the error. 822d021c344SAndy King */ 823d021c344SAndy King 824d021c344SAndy King sk = sock->sk; 825d021c344SAndy King if (sock->state == SS_UNCONNECTED) { 826d021c344SAndy King err = -ENOTCONN; 827d021c344SAndy King if (sk->sk_type == SOCK_STREAM) 828d021c344SAndy King return err; 829d021c344SAndy King } else { 830d021c344SAndy King sock->state = SS_DISCONNECTING; 831d021c344SAndy King err = 0; 832d021c344SAndy King } 833d021c344SAndy King 834d021c344SAndy King /* Receive and send shutdowns are treated alike. */ 835d021c344SAndy King mode = mode & (RCV_SHUTDOWN | SEND_SHUTDOWN); 836d021c344SAndy King if (mode) { 837d021c344SAndy King lock_sock(sk); 838d021c344SAndy King sk->sk_shutdown |= mode; 839d021c344SAndy King sk->sk_state_change(sk); 840d021c344SAndy King release_sock(sk); 841d021c344SAndy King 842d021c344SAndy King if (sk->sk_type == SOCK_STREAM) { 843d021c344SAndy King sock_reset_flag(sk, SOCK_DONE); 844d021c344SAndy King vsock_send_shutdown(sk, mode); 845d021c344SAndy King } 846d021c344SAndy King } 847d021c344SAndy King 848d021c344SAndy King return err; 849d021c344SAndy King } 850d021c344SAndy King 851d021c344SAndy King static unsigned int vsock_poll(struct file *file, struct socket *sock, 852d021c344SAndy King poll_table *wait) 853d021c344SAndy King { 854d021c344SAndy King struct sock *sk; 855d021c344SAndy King unsigned int mask; 856d021c344SAndy King struct vsock_sock *vsk; 857d021c344SAndy King 858d021c344SAndy King sk = sock->sk; 859d021c344SAndy King vsk = vsock_sk(sk); 860d021c344SAndy King 861d021c344SAndy King poll_wait(file, sk_sleep(sk), wait); 862d021c344SAndy King mask = 0; 863d021c344SAndy King 864d021c344SAndy King if (sk->sk_err) 865d021c344SAndy King /* Signify that there has been an error on this socket. */ 866d021c344SAndy King mask |= POLLERR; 867d021c344SAndy King 868d021c344SAndy King /* INET sockets treat local write shutdown and peer write shutdown as a 869d021c344SAndy King * case of POLLHUP set. 870d021c344SAndy King */ 871d021c344SAndy King if ((sk->sk_shutdown == SHUTDOWN_MASK) || 872d021c344SAndy King ((sk->sk_shutdown & SEND_SHUTDOWN) && 873d021c344SAndy King (vsk->peer_shutdown & SEND_SHUTDOWN))) { 874d021c344SAndy King mask |= POLLHUP; 875d021c344SAndy King } 876d021c344SAndy King 877d021c344SAndy King if (sk->sk_shutdown & RCV_SHUTDOWN || 878d021c344SAndy King vsk->peer_shutdown & SEND_SHUTDOWN) { 879d021c344SAndy King mask |= POLLRDHUP; 880d021c344SAndy King } 881d021c344SAndy King 882d021c344SAndy King if (sock->type == SOCK_DGRAM) { 883d021c344SAndy King /* For datagram sockets we can read if there is something in 884d021c344SAndy King * the queue and write as long as the socket isn't shutdown for 885d021c344SAndy King * sending. 886d021c344SAndy King */ 887d021c344SAndy King if (!skb_queue_empty(&sk->sk_receive_queue) || 888d021c344SAndy King (sk->sk_shutdown & RCV_SHUTDOWN)) { 889d021c344SAndy King mask |= POLLIN | POLLRDNORM; 890d021c344SAndy King } 891d021c344SAndy King 892d021c344SAndy King if (!(sk->sk_shutdown & SEND_SHUTDOWN)) 893d021c344SAndy King mask |= POLLOUT | POLLWRNORM | POLLWRBAND; 894d021c344SAndy King 895d021c344SAndy King } else if (sock->type == SOCK_STREAM) { 896d021c344SAndy King lock_sock(sk); 897d021c344SAndy King 898d021c344SAndy King /* Listening sockets that have connections in their accept 899d021c344SAndy King * queue can be read. 900d021c344SAndy King */ 901ea3803c1SStefan Hajnoczi if (sk->sk_state == VSOCK_SS_LISTEN 902d021c344SAndy King && !vsock_is_accept_queue_empty(sk)) 903d021c344SAndy King mask |= POLLIN | POLLRDNORM; 904d021c344SAndy King 905d021c344SAndy King /* If there is something in the queue then we can read. */ 906d021c344SAndy King if (transport->stream_is_active(vsk) && 907d021c344SAndy King !(sk->sk_shutdown & RCV_SHUTDOWN)) { 908d021c344SAndy King bool data_ready_now = false; 909d021c344SAndy King int ret = transport->notify_poll_in( 910d021c344SAndy King vsk, 1, &data_ready_now); 911d021c344SAndy King if (ret < 0) { 912d021c344SAndy King mask |= POLLERR; 913d021c344SAndy King } else { 914d021c344SAndy King if (data_ready_now) 915d021c344SAndy King mask |= POLLIN | POLLRDNORM; 916d021c344SAndy King 917d021c344SAndy King } 918d021c344SAndy King } 919d021c344SAndy King 920d021c344SAndy King /* Sockets whose connections have been closed, reset, or 921d021c344SAndy King * terminated should also be considered read, and we check the 922d021c344SAndy King * shutdown flag for that. 923d021c344SAndy King */ 924d021c344SAndy King if (sk->sk_shutdown & RCV_SHUTDOWN || 925d021c344SAndy King vsk->peer_shutdown & SEND_SHUTDOWN) { 926d021c344SAndy King mask |= POLLIN | POLLRDNORM; 927d021c344SAndy King } 928d021c344SAndy King 929d021c344SAndy King /* Connected sockets that can produce data can be written. */ 930d021c344SAndy King if (sk->sk_state == SS_CONNECTED) { 931d021c344SAndy King if (!(sk->sk_shutdown & SEND_SHUTDOWN)) { 932d021c344SAndy King bool space_avail_now = false; 933d021c344SAndy King int ret = transport->notify_poll_out( 934d021c344SAndy King vsk, 1, &space_avail_now); 935d021c344SAndy King if (ret < 0) { 936d021c344SAndy King mask |= POLLERR; 937d021c344SAndy King } else { 938d021c344SAndy King if (space_avail_now) 939d021c344SAndy King /* Remove POLLWRBAND since INET 940d021c344SAndy King * sockets are not setting it. 941d021c344SAndy King */ 942d021c344SAndy King mask |= POLLOUT | POLLWRNORM; 943d021c344SAndy King 944d021c344SAndy King } 945d021c344SAndy King } 946d021c344SAndy King } 947d021c344SAndy King 948d021c344SAndy King /* Simulate INET socket poll behaviors, which sets 949d021c344SAndy King * POLLOUT|POLLWRNORM when peer is closed and nothing to read, 950d021c344SAndy King * but local send is not shutdown. 951d021c344SAndy King */ 952d021c344SAndy King if (sk->sk_state == SS_UNCONNECTED) { 953d021c344SAndy King if (!(sk->sk_shutdown & SEND_SHUTDOWN)) 954d021c344SAndy King mask |= POLLOUT | POLLWRNORM; 955d021c344SAndy King 956d021c344SAndy King } 957d021c344SAndy King 958d021c344SAndy King release_sock(sk); 959d021c344SAndy King } 960d021c344SAndy King 961d021c344SAndy King return mask; 962d021c344SAndy King } 963d021c344SAndy King 9641b784140SYing Xue static int vsock_dgram_sendmsg(struct socket *sock, struct msghdr *msg, 9651b784140SYing Xue size_t len) 966d021c344SAndy King { 967d021c344SAndy King int err; 968d021c344SAndy King struct sock *sk; 969d021c344SAndy King struct vsock_sock *vsk; 970d021c344SAndy King struct sockaddr_vm *remote_addr; 971d021c344SAndy King 972d021c344SAndy King if (msg->msg_flags & MSG_OOB) 973d021c344SAndy King return -EOPNOTSUPP; 974d021c344SAndy King 975d021c344SAndy King /* For now, MSG_DONTWAIT is always assumed... */ 976d021c344SAndy King err = 0; 977d021c344SAndy King sk = sock->sk; 978d021c344SAndy King vsk = vsock_sk(sk); 979d021c344SAndy King 980d021c344SAndy King lock_sock(sk); 981d021c344SAndy King 982b3a6dfe8SAsias He err = vsock_auto_bind(vsk); 983b3a6dfe8SAsias He if (err) 984d021c344SAndy King goto out; 985d021c344SAndy King 986d021c344SAndy King 987d021c344SAndy King /* If the provided message contains an address, use that. Otherwise 988d021c344SAndy King * fall back on the socket's remote handle (if it has been connected). 989d021c344SAndy King */ 990d021c344SAndy King if (msg->msg_name && 991d021c344SAndy King vsock_addr_cast(msg->msg_name, msg->msg_namelen, 992d021c344SAndy King &remote_addr) == 0) { 993d021c344SAndy King /* Ensure this address is of the right type and is a valid 994d021c344SAndy King * destination. 995d021c344SAndy King */ 996d021c344SAndy King 997d021c344SAndy King if (remote_addr->svm_cid == VMADDR_CID_ANY) 998d021c344SAndy King remote_addr->svm_cid = transport->get_local_cid(); 999d021c344SAndy King 1000d021c344SAndy King if (!vsock_addr_bound(remote_addr)) { 1001d021c344SAndy King err = -EINVAL; 1002d021c344SAndy King goto out; 1003d021c344SAndy King } 1004d021c344SAndy King } else if (sock->state == SS_CONNECTED) { 1005d021c344SAndy King remote_addr = &vsk->remote_addr; 1006d021c344SAndy King 1007d021c344SAndy King if (remote_addr->svm_cid == VMADDR_CID_ANY) 1008d021c344SAndy King remote_addr->svm_cid = transport->get_local_cid(); 1009d021c344SAndy King 1010d021c344SAndy King /* XXX Should connect() or this function ensure remote_addr is 1011d021c344SAndy King * bound? 1012d021c344SAndy King */ 1013d021c344SAndy King if (!vsock_addr_bound(&vsk->remote_addr)) { 1014d021c344SAndy King err = -EINVAL; 1015d021c344SAndy King goto out; 1016d021c344SAndy King } 1017d021c344SAndy King } else { 1018d021c344SAndy King err = -EINVAL; 1019d021c344SAndy King goto out; 1020d021c344SAndy King } 1021d021c344SAndy King 1022d021c344SAndy King if (!transport->dgram_allow(remote_addr->svm_cid, 1023d021c344SAndy King remote_addr->svm_port)) { 1024d021c344SAndy King err = -EINVAL; 1025d021c344SAndy King goto out; 1026d021c344SAndy King } 1027d021c344SAndy King 10280f7db23aSAl Viro err = transport->dgram_enqueue(vsk, remote_addr, msg, len); 1029d021c344SAndy King 1030d021c344SAndy King out: 1031d021c344SAndy King release_sock(sk); 1032d021c344SAndy King return err; 1033d021c344SAndy King } 1034d021c344SAndy King 1035d021c344SAndy King static int vsock_dgram_connect(struct socket *sock, 1036d021c344SAndy King struct sockaddr *addr, int addr_len, int flags) 1037d021c344SAndy King { 1038d021c344SAndy King int err; 1039d021c344SAndy King struct sock *sk; 1040d021c344SAndy King struct vsock_sock *vsk; 1041d021c344SAndy King struct sockaddr_vm *remote_addr; 1042d021c344SAndy King 1043d021c344SAndy King sk = sock->sk; 1044d021c344SAndy King vsk = vsock_sk(sk); 1045d021c344SAndy King 1046d021c344SAndy King err = vsock_addr_cast(addr, addr_len, &remote_addr); 1047d021c344SAndy King if (err == -EAFNOSUPPORT && remote_addr->svm_family == AF_UNSPEC) { 1048d021c344SAndy King lock_sock(sk); 1049d021c344SAndy King vsock_addr_init(&vsk->remote_addr, VMADDR_CID_ANY, 1050d021c344SAndy King VMADDR_PORT_ANY); 1051d021c344SAndy King sock->state = SS_UNCONNECTED; 1052d021c344SAndy King release_sock(sk); 1053d021c344SAndy King return 0; 1054d021c344SAndy King } else if (err != 0) 1055d021c344SAndy King return -EINVAL; 1056d021c344SAndy King 1057d021c344SAndy King lock_sock(sk); 1058d021c344SAndy King 1059b3a6dfe8SAsias He err = vsock_auto_bind(vsk); 1060b3a6dfe8SAsias He if (err) 1061d021c344SAndy King goto out; 1062d021c344SAndy King 1063d021c344SAndy King if (!transport->dgram_allow(remote_addr->svm_cid, 1064d021c344SAndy King remote_addr->svm_port)) { 1065d021c344SAndy King err = -EINVAL; 1066d021c344SAndy King goto out; 1067d021c344SAndy King } 1068d021c344SAndy King 1069d021c344SAndy King memcpy(&vsk->remote_addr, remote_addr, sizeof(vsk->remote_addr)); 1070d021c344SAndy King sock->state = SS_CONNECTED; 1071d021c344SAndy King 1072d021c344SAndy King out: 1073d021c344SAndy King release_sock(sk); 1074d021c344SAndy King return err; 1075d021c344SAndy King } 1076d021c344SAndy King 10771b784140SYing Xue static int vsock_dgram_recvmsg(struct socket *sock, struct msghdr *msg, 10781b784140SYing Xue size_t len, int flags) 1079d021c344SAndy King { 10801b784140SYing Xue return transport->dgram_dequeue(vsock_sk(sock->sk), msg, len, flags); 1081d021c344SAndy King } 1082d021c344SAndy King 1083d021c344SAndy King static const struct proto_ops vsock_dgram_ops = { 1084d021c344SAndy King .family = PF_VSOCK, 1085d021c344SAndy King .owner = THIS_MODULE, 1086d021c344SAndy King .release = vsock_release, 1087d021c344SAndy King .bind = vsock_bind, 1088d021c344SAndy King .connect = vsock_dgram_connect, 1089d021c344SAndy King .socketpair = sock_no_socketpair, 1090d021c344SAndy King .accept = sock_no_accept, 1091d021c344SAndy King .getname = vsock_getname, 1092d021c344SAndy King .poll = vsock_poll, 1093d021c344SAndy King .ioctl = sock_no_ioctl, 1094d021c344SAndy King .listen = sock_no_listen, 1095d021c344SAndy King .shutdown = vsock_shutdown, 1096d021c344SAndy King .setsockopt = sock_no_setsockopt, 1097d021c344SAndy King .getsockopt = sock_no_getsockopt, 1098d021c344SAndy King .sendmsg = vsock_dgram_sendmsg, 1099d021c344SAndy King .recvmsg = vsock_dgram_recvmsg, 1100d021c344SAndy King .mmap = sock_no_mmap, 1101d021c344SAndy King .sendpage = sock_no_sendpage, 1102d021c344SAndy King }; 1103d021c344SAndy King 1104d021c344SAndy King static void vsock_connect_timeout(struct work_struct *work) 1105d021c344SAndy King { 1106d021c344SAndy King struct sock *sk; 1107d021c344SAndy King struct vsock_sock *vsk; 1108d021c344SAndy King 1109d021c344SAndy King vsk = container_of(work, struct vsock_sock, dwork.work); 1110d021c344SAndy King sk = sk_vsock(vsk); 1111d021c344SAndy King 1112d021c344SAndy King lock_sock(sk); 1113d021c344SAndy King if (sk->sk_state == SS_CONNECTING && 1114d021c344SAndy King (sk->sk_shutdown != SHUTDOWN_MASK)) { 1115d021c344SAndy King sk->sk_state = SS_UNCONNECTED; 1116d021c344SAndy King sk->sk_err = ETIMEDOUT; 1117d021c344SAndy King sk->sk_error_report(sk); 1118d021c344SAndy King } 1119d021c344SAndy King release_sock(sk); 1120d021c344SAndy King 1121d021c344SAndy King sock_put(sk); 1122d021c344SAndy King } 1123d021c344SAndy King 1124d021c344SAndy King static int vsock_stream_connect(struct socket *sock, struct sockaddr *addr, 1125d021c344SAndy King int addr_len, int flags) 1126d021c344SAndy King { 1127d021c344SAndy King int err; 1128d021c344SAndy King struct sock *sk; 1129d021c344SAndy King struct vsock_sock *vsk; 1130d021c344SAndy King struct sockaddr_vm *remote_addr; 1131d021c344SAndy King long timeout; 1132d021c344SAndy King DEFINE_WAIT(wait); 1133d021c344SAndy King 1134d021c344SAndy King err = 0; 1135d021c344SAndy King sk = sock->sk; 1136d021c344SAndy King vsk = vsock_sk(sk); 1137d021c344SAndy King 1138d021c344SAndy King lock_sock(sk); 1139d021c344SAndy King 1140d021c344SAndy King /* XXX AF_UNSPEC should make us disconnect like AF_INET. */ 1141d021c344SAndy King switch (sock->state) { 1142d021c344SAndy King case SS_CONNECTED: 1143d021c344SAndy King err = -EISCONN; 1144d021c344SAndy King goto out; 1145d021c344SAndy King case SS_DISCONNECTING: 1146d021c344SAndy King err = -EINVAL; 1147d021c344SAndy King goto out; 1148d021c344SAndy King case SS_CONNECTING: 1149d021c344SAndy King /* This continues on so we can move sock into the SS_CONNECTED 1150d021c344SAndy King * state once the connection has completed (at which point err 1151d021c344SAndy King * will be set to zero also). Otherwise, we will either wait 1152d021c344SAndy King * for the connection or return -EALREADY should this be a 1153d021c344SAndy King * non-blocking call. 1154d021c344SAndy King */ 1155d021c344SAndy King err = -EALREADY; 1156d021c344SAndy King break; 1157d021c344SAndy King default: 1158ea3803c1SStefan Hajnoczi if ((sk->sk_state == VSOCK_SS_LISTEN) || 1159d021c344SAndy King vsock_addr_cast(addr, addr_len, &remote_addr) != 0) { 1160d021c344SAndy King err = -EINVAL; 1161d021c344SAndy King goto out; 1162d021c344SAndy King } 1163d021c344SAndy King 1164d021c344SAndy King /* The hypervisor and well-known contexts do not have socket 1165d021c344SAndy King * endpoints. 1166d021c344SAndy King */ 1167d021c344SAndy King if (!transport->stream_allow(remote_addr->svm_cid, 1168d021c344SAndy King remote_addr->svm_port)) { 1169d021c344SAndy King err = -ENETUNREACH; 1170d021c344SAndy King goto out; 1171d021c344SAndy King } 1172d021c344SAndy King 1173d021c344SAndy King /* Set the remote address that we are connecting to. */ 1174d021c344SAndy King memcpy(&vsk->remote_addr, remote_addr, 1175d021c344SAndy King sizeof(vsk->remote_addr)); 1176d021c344SAndy King 1177b3a6dfe8SAsias He err = vsock_auto_bind(vsk); 1178b3a6dfe8SAsias He if (err) 1179d021c344SAndy King goto out; 1180d021c344SAndy King 1181d021c344SAndy King sk->sk_state = SS_CONNECTING; 1182d021c344SAndy King 1183d021c344SAndy King err = transport->connect(vsk); 1184d021c344SAndy King if (err < 0) 1185d021c344SAndy King goto out; 1186d021c344SAndy King 1187d021c344SAndy King /* Mark sock as connecting and set the error code to in 1188d021c344SAndy King * progress in case this is a non-blocking connect. 1189d021c344SAndy King */ 1190d021c344SAndy King sock->state = SS_CONNECTING; 1191d021c344SAndy King err = -EINPROGRESS; 1192d021c344SAndy King } 1193d021c344SAndy King 1194d021c344SAndy King /* The receive path will handle all communication until we are able to 1195d021c344SAndy King * enter the connected state. Here we wait for the connection to be 1196d021c344SAndy King * completed or a notification of an error. 1197d021c344SAndy King */ 1198d021c344SAndy King timeout = vsk->connect_timeout; 1199d021c344SAndy King prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 1200d021c344SAndy King 1201d021c344SAndy King while (sk->sk_state != SS_CONNECTED && sk->sk_err == 0) { 1202d021c344SAndy King if (flags & O_NONBLOCK) { 1203d021c344SAndy King /* If we're not going to block, we schedule a timeout 1204d021c344SAndy King * function to generate a timeout on the connection 1205d021c344SAndy King * attempt, in case the peer doesn't respond in a 1206d021c344SAndy King * timely manner. We hold on to the socket until the 1207d021c344SAndy King * timeout fires. 1208d021c344SAndy King */ 1209d021c344SAndy King sock_hold(sk); 1210d021c344SAndy King INIT_DELAYED_WORK(&vsk->dwork, 1211d021c344SAndy King vsock_connect_timeout); 1212d021c344SAndy King schedule_delayed_work(&vsk->dwork, timeout); 1213d021c344SAndy King 1214d021c344SAndy King /* Skip ahead to preserve error code set above. */ 1215d021c344SAndy King goto out_wait; 1216d021c344SAndy King } 1217d021c344SAndy King 1218d021c344SAndy King release_sock(sk); 1219d021c344SAndy King timeout = schedule_timeout(timeout); 1220d021c344SAndy King lock_sock(sk); 1221d021c344SAndy King 1222d021c344SAndy King if (signal_pending(current)) { 1223d021c344SAndy King err = sock_intr_errno(timeout); 1224f7f9b5e7SClaudio Imbrenda sk->sk_state = SS_UNCONNECTED; 1225f7f9b5e7SClaudio Imbrenda sock->state = SS_UNCONNECTED; 1226f7f9b5e7SClaudio Imbrenda goto out_wait; 1227d021c344SAndy King } else if (timeout == 0) { 1228d021c344SAndy King err = -ETIMEDOUT; 1229f7f9b5e7SClaudio Imbrenda sk->sk_state = SS_UNCONNECTED; 1230f7f9b5e7SClaudio Imbrenda sock->state = SS_UNCONNECTED; 1231f7f9b5e7SClaudio Imbrenda goto out_wait; 1232d021c344SAndy King } 1233d021c344SAndy King 1234d021c344SAndy King prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 1235d021c344SAndy King } 1236d021c344SAndy King 1237d021c344SAndy King if (sk->sk_err) { 1238d021c344SAndy King err = -sk->sk_err; 1239f7f9b5e7SClaudio Imbrenda sk->sk_state = SS_UNCONNECTED; 1240f7f9b5e7SClaudio Imbrenda sock->state = SS_UNCONNECTED; 1241f7f9b5e7SClaudio Imbrenda } else { 1242d021c344SAndy King err = 0; 1243f7f9b5e7SClaudio Imbrenda } 1244d021c344SAndy King 1245d021c344SAndy King out_wait: 1246d021c344SAndy King finish_wait(sk_sleep(sk), &wait); 1247d021c344SAndy King out: 1248d021c344SAndy King release_sock(sk); 1249d021c344SAndy King return err; 1250d021c344SAndy King } 1251d021c344SAndy King 1252d021c344SAndy King static int vsock_accept(struct socket *sock, struct socket *newsock, int flags) 1253d021c344SAndy King { 1254d021c344SAndy King struct sock *listener; 1255d021c344SAndy King int err; 1256d021c344SAndy King struct sock *connected; 1257d021c344SAndy King struct vsock_sock *vconnected; 1258d021c344SAndy King long timeout; 1259d021c344SAndy King DEFINE_WAIT(wait); 1260d021c344SAndy King 1261d021c344SAndy King err = 0; 1262d021c344SAndy King listener = sock->sk; 1263d021c344SAndy King 1264d021c344SAndy King lock_sock(listener); 1265d021c344SAndy King 1266d021c344SAndy King if (sock->type != SOCK_STREAM) { 1267d021c344SAndy King err = -EOPNOTSUPP; 1268d021c344SAndy King goto out; 1269d021c344SAndy King } 1270d021c344SAndy King 1271ea3803c1SStefan Hajnoczi if (listener->sk_state != VSOCK_SS_LISTEN) { 1272d021c344SAndy King err = -EINVAL; 1273d021c344SAndy King goto out; 1274d021c344SAndy King } 1275d021c344SAndy King 1276d021c344SAndy King /* Wait for children sockets to appear; these are the new sockets 1277d021c344SAndy King * created upon connection establishment. 1278d021c344SAndy King */ 1279d021c344SAndy King timeout = sock_sndtimeo(listener, flags & O_NONBLOCK); 1280d021c344SAndy King prepare_to_wait(sk_sleep(listener), &wait, TASK_INTERRUPTIBLE); 1281d021c344SAndy King 1282d021c344SAndy King while ((connected = vsock_dequeue_accept(listener)) == NULL && 1283d021c344SAndy King listener->sk_err == 0) { 1284d021c344SAndy King release_sock(listener); 1285d021c344SAndy King timeout = schedule_timeout(timeout); 1286f7f9b5e7SClaudio Imbrenda finish_wait(sk_sleep(listener), &wait); 1287d021c344SAndy King lock_sock(listener); 1288d021c344SAndy King 1289d021c344SAndy King if (signal_pending(current)) { 1290d021c344SAndy King err = sock_intr_errno(timeout); 1291f7f9b5e7SClaudio Imbrenda goto out; 1292d021c344SAndy King } else if (timeout == 0) { 1293d021c344SAndy King err = -EAGAIN; 1294f7f9b5e7SClaudio Imbrenda goto out; 1295d021c344SAndy King } 1296d021c344SAndy King 1297d021c344SAndy King prepare_to_wait(sk_sleep(listener), &wait, TASK_INTERRUPTIBLE); 1298d021c344SAndy King } 1299f7f9b5e7SClaudio Imbrenda finish_wait(sk_sleep(listener), &wait); 1300d021c344SAndy King 1301d021c344SAndy King if (listener->sk_err) 1302d021c344SAndy King err = -listener->sk_err; 1303d021c344SAndy King 1304d021c344SAndy King if (connected) { 1305d021c344SAndy King listener->sk_ack_backlog--; 1306d021c344SAndy King 13074192f672SStefan Hajnoczi lock_sock_nested(connected, SINGLE_DEPTH_NESTING); 1308d021c344SAndy King vconnected = vsock_sk(connected); 1309d021c344SAndy King 1310d021c344SAndy King /* If the listener socket has received an error, then we should 1311d021c344SAndy King * reject this socket and return. Note that we simply mark the 1312d021c344SAndy King * socket rejected, drop our reference, and let the cleanup 1313d021c344SAndy King * function handle the cleanup; the fact that we found it in 1314d021c344SAndy King * the listener's accept queue guarantees that the cleanup 1315d021c344SAndy King * function hasn't run yet. 1316d021c344SAndy King */ 1317d021c344SAndy King if (err) { 1318d021c344SAndy King vconnected->rejected = true; 1319f7f9b5e7SClaudio Imbrenda } else { 1320d021c344SAndy King newsock->state = SS_CONNECTED; 1321d021c344SAndy King sock_graft(connected, newsock); 1322f7f9b5e7SClaudio Imbrenda } 1323f7f9b5e7SClaudio Imbrenda 1324d021c344SAndy King release_sock(connected); 1325d021c344SAndy King sock_put(connected); 1326d021c344SAndy King } 1327d021c344SAndy King 1328d021c344SAndy King out: 1329d021c344SAndy King release_sock(listener); 1330d021c344SAndy King return err; 1331d021c344SAndy King } 1332d021c344SAndy King 1333d021c344SAndy King static int vsock_listen(struct socket *sock, int backlog) 1334d021c344SAndy King { 1335d021c344SAndy King int err; 1336d021c344SAndy King struct sock *sk; 1337d021c344SAndy King struct vsock_sock *vsk; 1338d021c344SAndy King 1339d021c344SAndy King sk = sock->sk; 1340d021c344SAndy King 1341d021c344SAndy King lock_sock(sk); 1342d021c344SAndy King 1343d021c344SAndy King if (sock->type != SOCK_STREAM) { 1344d021c344SAndy King err = -EOPNOTSUPP; 1345d021c344SAndy King goto out; 1346d021c344SAndy King } 1347d021c344SAndy King 1348d021c344SAndy King if (sock->state != SS_UNCONNECTED) { 1349d021c344SAndy King err = -EINVAL; 1350d021c344SAndy King goto out; 1351d021c344SAndy King } 1352d021c344SAndy King 1353d021c344SAndy King vsk = vsock_sk(sk); 1354d021c344SAndy King 1355d021c344SAndy King if (!vsock_addr_bound(&vsk->local_addr)) { 1356d021c344SAndy King err = -EINVAL; 1357d021c344SAndy King goto out; 1358d021c344SAndy King } 1359d021c344SAndy King 1360d021c344SAndy King sk->sk_max_ack_backlog = backlog; 1361ea3803c1SStefan Hajnoczi sk->sk_state = VSOCK_SS_LISTEN; 1362d021c344SAndy King 1363d021c344SAndy King err = 0; 1364d021c344SAndy King 1365d021c344SAndy King out: 1366d021c344SAndy King release_sock(sk); 1367d021c344SAndy King return err; 1368d021c344SAndy King } 1369d021c344SAndy King 1370d021c344SAndy King static int vsock_stream_setsockopt(struct socket *sock, 1371d021c344SAndy King int level, 1372d021c344SAndy King int optname, 1373d021c344SAndy King char __user *optval, 1374d021c344SAndy King unsigned int optlen) 1375d021c344SAndy King { 1376d021c344SAndy King int err; 1377d021c344SAndy King struct sock *sk; 1378d021c344SAndy King struct vsock_sock *vsk; 1379d021c344SAndy King u64 val; 1380d021c344SAndy King 1381d021c344SAndy King if (level != AF_VSOCK) 1382d021c344SAndy King return -ENOPROTOOPT; 1383d021c344SAndy King 1384d021c344SAndy King #define COPY_IN(_v) \ 1385d021c344SAndy King do { \ 1386d021c344SAndy King if (optlen < sizeof(_v)) { \ 1387d021c344SAndy King err = -EINVAL; \ 1388d021c344SAndy King goto exit; \ 1389d021c344SAndy King } \ 1390d021c344SAndy King if (copy_from_user(&_v, optval, sizeof(_v)) != 0) { \ 1391d021c344SAndy King err = -EFAULT; \ 1392d021c344SAndy King goto exit; \ 1393d021c344SAndy King } \ 1394d021c344SAndy King } while (0) 1395d021c344SAndy King 1396d021c344SAndy King err = 0; 1397d021c344SAndy King sk = sock->sk; 1398d021c344SAndy King vsk = vsock_sk(sk); 1399d021c344SAndy King 1400d021c344SAndy King lock_sock(sk); 1401d021c344SAndy King 1402d021c344SAndy King switch (optname) { 1403d021c344SAndy King case SO_VM_SOCKETS_BUFFER_SIZE: 1404d021c344SAndy King COPY_IN(val); 1405d021c344SAndy King transport->set_buffer_size(vsk, val); 1406d021c344SAndy King break; 1407d021c344SAndy King 1408d021c344SAndy King case SO_VM_SOCKETS_BUFFER_MAX_SIZE: 1409d021c344SAndy King COPY_IN(val); 1410d021c344SAndy King transport->set_max_buffer_size(vsk, val); 1411d021c344SAndy King break; 1412d021c344SAndy King 1413d021c344SAndy King case SO_VM_SOCKETS_BUFFER_MIN_SIZE: 1414d021c344SAndy King COPY_IN(val); 1415d021c344SAndy King transport->set_min_buffer_size(vsk, val); 1416d021c344SAndy King break; 1417d021c344SAndy King 1418d021c344SAndy King case SO_VM_SOCKETS_CONNECT_TIMEOUT: { 1419d021c344SAndy King struct timeval tv; 1420d021c344SAndy King COPY_IN(tv); 1421d021c344SAndy King if (tv.tv_sec >= 0 && tv.tv_usec < USEC_PER_SEC && 1422d021c344SAndy King tv.tv_sec < (MAX_SCHEDULE_TIMEOUT / HZ - 1)) { 1423d021c344SAndy King vsk->connect_timeout = tv.tv_sec * HZ + 1424d021c344SAndy King DIV_ROUND_UP(tv.tv_usec, (1000000 / HZ)); 1425d021c344SAndy King if (vsk->connect_timeout == 0) 1426d021c344SAndy King vsk->connect_timeout = 1427d021c344SAndy King VSOCK_DEFAULT_CONNECT_TIMEOUT; 1428d021c344SAndy King 1429d021c344SAndy King } else { 1430d021c344SAndy King err = -ERANGE; 1431d021c344SAndy King } 1432d021c344SAndy King break; 1433d021c344SAndy King } 1434d021c344SAndy King 1435d021c344SAndy King default: 1436d021c344SAndy King err = -ENOPROTOOPT; 1437d021c344SAndy King break; 1438d021c344SAndy King } 1439d021c344SAndy King 1440d021c344SAndy King #undef COPY_IN 1441d021c344SAndy King 1442d021c344SAndy King exit: 1443d021c344SAndy King release_sock(sk); 1444d021c344SAndy King return err; 1445d021c344SAndy King } 1446d021c344SAndy King 1447d021c344SAndy King static int vsock_stream_getsockopt(struct socket *sock, 1448d021c344SAndy King int level, int optname, 1449d021c344SAndy King char __user *optval, 1450d021c344SAndy King int __user *optlen) 1451d021c344SAndy King { 1452d021c344SAndy King int err; 1453d021c344SAndy King int len; 1454d021c344SAndy King struct sock *sk; 1455d021c344SAndy King struct vsock_sock *vsk; 1456d021c344SAndy King u64 val; 1457d021c344SAndy King 1458d021c344SAndy King if (level != AF_VSOCK) 1459d021c344SAndy King return -ENOPROTOOPT; 1460d021c344SAndy King 1461d021c344SAndy King err = get_user(len, optlen); 1462d021c344SAndy King if (err != 0) 1463d021c344SAndy King return err; 1464d021c344SAndy King 1465d021c344SAndy King #define COPY_OUT(_v) \ 1466d021c344SAndy King do { \ 1467d021c344SAndy King if (len < sizeof(_v)) \ 1468d021c344SAndy King return -EINVAL; \ 1469d021c344SAndy King \ 1470d021c344SAndy King len = sizeof(_v); \ 1471d021c344SAndy King if (copy_to_user(optval, &_v, len) != 0) \ 1472d021c344SAndy King return -EFAULT; \ 1473d021c344SAndy King \ 1474d021c344SAndy King } while (0) 1475d021c344SAndy King 1476d021c344SAndy King err = 0; 1477d021c344SAndy King sk = sock->sk; 1478d021c344SAndy King vsk = vsock_sk(sk); 1479d021c344SAndy King 1480d021c344SAndy King switch (optname) { 1481d021c344SAndy King case SO_VM_SOCKETS_BUFFER_SIZE: 1482d021c344SAndy King val = transport->get_buffer_size(vsk); 1483d021c344SAndy King COPY_OUT(val); 1484d021c344SAndy King break; 1485d021c344SAndy King 1486d021c344SAndy King case SO_VM_SOCKETS_BUFFER_MAX_SIZE: 1487d021c344SAndy King val = transport->get_max_buffer_size(vsk); 1488d021c344SAndy King COPY_OUT(val); 1489d021c344SAndy King break; 1490d021c344SAndy King 1491d021c344SAndy King case SO_VM_SOCKETS_BUFFER_MIN_SIZE: 1492d021c344SAndy King val = transport->get_min_buffer_size(vsk); 1493d021c344SAndy King COPY_OUT(val); 1494d021c344SAndy King break; 1495d021c344SAndy King 1496d021c344SAndy King case SO_VM_SOCKETS_CONNECT_TIMEOUT: { 1497d021c344SAndy King struct timeval tv; 1498d021c344SAndy King tv.tv_sec = vsk->connect_timeout / HZ; 1499d021c344SAndy King tv.tv_usec = 1500d021c344SAndy King (vsk->connect_timeout - 1501d021c344SAndy King tv.tv_sec * HZ) * (1000000 / HZ); 1502d021c344SAndy King COPY_OUT(tv); 1503d021c344SAndy King break; 1504d021c344SAndy King } 1505d021c344SAndy King default: 1506d021c344SAndy King return -ENOPROTOOPT; 1507d021c344SAndy King } 1508d021c344SAndy King 1509d021c344SAndy King err = put_user(len, optlen); 1510d021c344SAndy King if (err != 0) 1511d021c344SAndy King return -EFAULT; 1512d021c344SAndy King 1513d021c344SAndy King #undef COPY_OUT 1514d021c344SAndy King 1515d021c344SAndy King return 0; 1516d021c344SAndy King } 1517d021c344SAndy King 15181b784140SYing Xue static int vsock_stream_sendmsg(struct socket *sock, struct msghdr *msg, 15191b784140SYing Xue size_t len) 1520d021c344SAndy King { 1521d021c344SAndy King struct sock *sk; 1522d021c344SAndy King struct vsock_sock *vsk; 1523d021c344SAndy King ssize_t total_written; 1524d021c344SAndy King long timeout; 1525d021c344SAndy King int err; 1526d021c344SAndy King struct vsock_transport_send_notify_data send_data; 1527d021c344SAndy King 1528d021c344SAndy King DEFINE_WAIT(wait); 1529d021c344SAndy King 1530d021c344SAndy King sk = sock->sk; 1531d021c344SAndy King vsk = vsock_sk(sk); 1532d021c344SAndy King total_written = 0; 1533d021c344SAndy King err = 0; 1534d021c344SAndy King 1535d021c344SAndy King if (msg->msg_flags & MSG_OOB) 1536d021c344SAndy King return -EOPNOTSUPP; 1537d021c344SAndy King 1538d021c344SAndy King lock_sock(sk); 1539d021c344SAndy King 1540d021c344SAndy King /* Callers should not provide a destination with stream sockets. */ 1541d021c344SAndy King if (msg->msg_namelen) { 1542d021c344SAndy King err = sk->sk_state == SS_CONNECTED ? -EISCONN : -EOPNOTSUPP; 1543d021c344SAndy King goto out; 1544d021c344SAndy King } 1545d021c344SAndy King 1546d021c344SAndy King /* Send data only if both sides are not shutdown in the direction. */ 1547d021c344SAndy King if (sk->sk_shutdown & SEND_SHUTDOWN || 1548d021c344SAndy King vsk->peer_shutdown & RCV_SHUTDOWN) { 1549d021c344SAndy King err = -EPIPE; 1550d021c344SAndy King goto out; 1551d021c344SAndy King } 1552d021c344SAndy King 1553d021c344SAndy King if (sk->sk_state != SS_CONNECTED || 1554d021c344SAndy King !vsock_addr_bound(&vsk->local_addr)) { 1555d021c344SAndy King err = -ENOTCONN; 1556d021c344SAndy King goto out; 1557d021c344SAndy King } 1558d021c344SAndy King 1559d021c344SAndy King if (!vsock_addr_bound(&vsk->remote_addr)) { 1560d021c344SAndy King err = -EDESTADDRREQ; 1561d021c344SAndy King goto out; 1562d021c344SAndy King } 1563d021c344SAndy King 1564d021c344SAndy King /* Wait for room in the produce queue to enqueue our user's data. */ 1565d021c344SAndy King timeout = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT); 1566d021c344SAndy King 1567d021c344SAndy King err = transport->notify_send_init(vsk, &send_data); 1568d021c344SAndy King if (err < 0) 1569d021c344SAndy King goto out; 1570d021c344SAndy King 15716f57e56aSClaudio Imbrenda 1572d021c344SAndy King while (total_written < len) { 1573d021c344SAndy King ssize_t written; 1574d021c344SAndy King 1575f7f9b5e7SClaudio Imbrenda prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 1576d021c344SAndy King while (vsock_stream_has_space(vsk) == 0 && 1577d021c344SAndy King sk->sk_err == 0 && 1578d021c344SAndy King !(sk->sk_shutdown & SEND_SHUTDOWN) && 1579d021c344SAndy King !(vsk->peer_shutdown & RCV_SHUTDOWN)) { 1580d021c344SAndy King 1581d021c344SAndy King /* Don't wait for non-blocking sockets. */ 1582d021c344SAndy King if (timeout == 0) { 1583d021c344SAndy King err = -EAGAIN; 1584f7f9b5e7SClaudio Imbrenda finish_wait(sk_sleep(sk), &wait); 1585f7f9b5e7SClaudio Imbrenda goto out_err; 1586d021c344SAndy King } 1587d021c344SAndy King 1588d021c344SAndy King err = transport->notify_send_pre_block(vsk, &send_data); 1589f7f9b5e7SClaudio Imbrenda if (err < 0) { 1590f7f9b5e7SClaudio Imbrenda finish_wait(sk_sleep(sk), &wait); 1591f7f9b5e7SClaudio Imbrenda goto out_err; 1592f7f9b5e7SClaudio Imbrenda } 1593d021c344SAndy King 1594d021c344SAndy King release_sock(sk); 1595d021c344SAndy King timeout = schedule_timeout(timeout); 1596d021c344SAndy King lock_sock(sk); 1597d021c344SAndy King if (signal_pending(current)) { 1598d021c344SAndy King err = sock_intr_errno(timeout); 1599f7f9b5e7SClaudio Imbrenda finish_wait(sk_sleep(sk), &wait); 1600f7f9b5e7SClaudio Imbrenda goto out_err; 1601d021c344SAndy King } else if (timeout == 0) { 1602d021c344SAndy King err = -EAGAIN; 1603f7f9b5e7SClaudio Imbrenda finish_wait(sk_sleep(sk), &wait); 1604f7f9b5e7SClaudio Imbrenda goto out_err; 1605d021c344SAndy King } 1606d021c344SAndy King 16076f57e56aSClaudio Imbrenda prepare_to_wait(sk_sleep(sk), &wait, 16086f57e56aSClaudio Imbrenda TASK_INTERRUPTIBLE); 1609d021c344SAndy King } 1610f7f9b5e7SClaudio Imbrenda finish_wait(sk_sleep(sk), &wait); 1611d021c344SAndy King 1612d021c344SAndy King /* These checks occur both as part of and after the loop 1613d021c344SAndy King * conditional since we need to check before and after 1614d021c344SAndy King * sleeping. 1615d021c344SAndy King */ 1616d021c344SAndy King if (sk->sk_err) { 1617d021c344SAndy King err = -sk->sk_err; 1618f7f9b5e7SClaudio Imbrenda goto out_err; 1619d021c344SAndy King } else if ((sk->sk_shutdown & SEND_SHUTDOWN) || 1620d021c344SAndy King (vsk->peer_shutdown & RCV_SHUTDOWN)) { 1621d021c344SAndy King err = -EPIPE; 1622f7f9b5e7SClaudio Imbrenda goto out_err; 1623d021c344SAndy King } 1624d021c344SAndy King 1625d021c344SAndy King err = transport->notify_send_pre_enqueue(vsk, &send_data); 1626d021c344SAndy King if (err < 0) 1627f7f9b5e7SClaudio Imbrenda goto out_err; 1628d021c344SAndy King 1629d021c344SAndy King /* Note that enqueue will only write as many bytes as are free 1630d021c344SAndy King * in the produce queue, so we don't need to ensure len is 1631d021c344SAndy King * smaller than the queue size. It is the caller's 1632d021c344SAndy King * responsibility to check how many bytes we were able to send. 1633d021c344SAndy King */ 1634d021c344SAndy King 1635d021c344SAndy King written = transport->stream_enqueue( 16360f7db23aSAl Viro vsk, msg, 1637d021c344SAndy King len - total_written); 1638d021c344SAndy King if (written < 0) { 1639d021c344SAndy King err = -ENOMEM; 1640f7f9b5e7SClaudio Imbrenda goto out_err; 1641d021c344SAndy King } 1642d021c344SAndy King 1643d021c344SAndy King total_written += written; 1644d021c344SAndy King 1645d021c344SAndy King err = transport->notify_send_post_enqueue( 1646d021c344SAndy King vsk, written, &send_data); 1647d021c344SAndy King if (err < 0) 1648f7f9b5e7SClaudio Imbrenda goto out_err; 1649d021c344SAndy King 1650d021c344SAndy King } 1651d021c344SAndy King 1652f7f9b5e7SClaudio Imbrenda out_err: 1653d021c344SAndy King if (total_written > 0) 1654d021c344SAndy King err = total_written; 1655d021c344SAndy King out: 1656d021c344SAndy King release_sock(sk); 1657d021c344SAndy King return err; 1658d021c344SAndy King } 1659d021c344SAndy King 1660d021c344SAndy King 1661d021c344SAndy King static int 16621b784140SYing Xue vsock_stream_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, 16631b784140SYing Xue int flags) 1664d021c344SAndy King { 1665d021c344SAndy King struct sock *sk; 1666d021c344SAndy King struct vsock_sock *vsk; 1667d021c344SAndy King int err; 1668d021c344SAndy King size_t target; 1669d021c344SAndy King ssize_t copied; 1670d021c344SAndy King long timeout; 1671d021c344SAndy King struct vsock_transport_recv_notify_data recv_data; 1672d021c344SAndy King 1673d021c344SAndy King DEFINE_WAIT(wait); 1674d021c344SAndy King 1675d021c344SAndy King sk = sock->sk; 1676d021c344SAndy King vsk = vsock_sk(sk); 1677d021c344SAndy King err = 0; 1678d021c344SAndy King 1679d021c344SAndy King lock_sock(sk); 1680d021c344SAndy King 1681d021c344SAndy King if (sk->sk_state != SS_CONNECTED) { 1682d021c344SAndy King /* Recvmsg is supposed to return 0 if a peer performs an 1683d021c344SAndy King * orderly shutdown. Differentiate between that case and when a 1684d021c344SAndy King * peer has not connected or a local shutdown occured with the 1685d021c344SAndy King * SOCK_DONE flag. 1686d021c344SAndy King */ 1687d021c344SAndy King if (sock_flag(sk, SOCK_DONE)) 1688d021c344SAndy King err = 0; 1689d021c344SAndy King else 1690d021c344SAndy King err = -ENOTCONN; 1691d021c344SAndy King 1692d021c344SAndy King goto out; 1693d021c344SAndy King } 1694d021c344SAndy King 1695d021c344SAndy King if (flags & MSG_OOB) { 1696d021c344SAndy King err = -EOPNOTSUPP; 1697d021c344SAndy King goto out; 1698d021c344SAndy King } 1699d021c344SAndy King 1700d021c344SAndy King /* We don't check peer_shutdown flag here since peer may actually shut 1701d021c344SAndy King * down, but there can be data in the queue that a local socket can 1702d021c344SAndy King * receive. 1703d021c344SAndy King */ 1704d021c344SAndy King if (sk->sk_shutdown & RCV_SHUTDOWN) { 1705d021c344SAndy King err = 0; 1706d021c344SAndy King goto out; 1707d021c344SAndy King } 1708d021c344SAndy King 1709d021c344SAndy King /* It is valid on Linux to pass in a zero-length receive buffer. This 1710d021c344SAndy King * is not an error. We may as well bail out now. 1711d021c344SAndy King */ 1712d021c344SAndy King if (!len) { 1713d021c344SAndy King err = 0; 1714d021c344SAndy King goto out; 1715d021c344SAndy King } 1716d021c344SAndy King 1717d021c344SAndy King /* We must not copy less than target bytes into the user's buffer 1718d021c344SAndy King * before returning successfully, so we wait for the consume queue to 1719d021c344SAndy King * have that much data to consume before dequeueing. Note that this 1720d021c344SAndy King * makes it impossible to handle cases where target is greater than the 1721d021c344SAndy King * queue size. 1722d021c344SAndy King */ 1723d021c344SAndy King target = sock_rcvlowat(sk, flags & MSG_WAITALL, len); 1724d021c344SAndy King if (target >= transport->stream_rcvhiwat(vsk)) { 1725d021c344SAndy King err = -ENOMEM; 1726d021c344SAndy King goto out; 1727d021c344SAndy King } 1728d021c344SAndy King timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); 1729d021c344SAndy King copied = 0; 1730d021c344SAndy King 1731d021c344SAndy King err = transport->notify_recv_init(vsk, target, &recv_data); 1732d021c344SAndy King if (err < 0) 1733d021c344SAndy King goto out; 1734d021c344SAndy King 1735d021c344SAndy King 1736d021c344SAndy King while (1) { 1737f7f9b5e7SClaudio Imbrenda s64 ready; 1738f7f9b5e7SClaudio Imbrenda 1739f7f9b5e7SClaudio Imbrenda prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 1740f7f9b5e7SClaudio Imbrenda ready = vsock_stream_has_data(vsk); 1741f7f9b5e7SClaudio Imbrenda 1742f7f9b5e7SClaudio Imbrenda if (ready == 0) { 1743f7f9b5e7SClaudio Imbrenda if (sk->sk_err != 0 || 1744f7f9b5e7SClaudio Imbrenda (sk->sk_shutdown & RCV_SHUTDOWN) || 1745f7f9b5e7SClaudio Imbrenda (vsk->peer_shutdown & SEND_SHUTDOWN)) { 1746f7f9b5e7SClaudio Imbrenda finish_wait(sk_sleep(sk), &wait); 1747f7f9b5e7SClaudio Imbrenda break; 1748f7f9b5e7SClaudio Imbrenda } 1749f7f9b5e7SClaudio Imbrenda /* Don't wait for non-blocking sockets. */ 1750f7f9b5e7SClaudio Imbrenda if (timeout == 0) { 1751f7f9b5e7SClaudio Imbrenda err = -EAGAIN; 1752f7f9b5e7SClaudio Imbrenda finish_wait(sk_sleep(sk), &wait); 1753f7f9b5e7SClaudio Imbrenda break; 1754f7f9b5e7SClaudio Imbrenda } 1755f7f9b5e7SClaudio Imbrenda 1756f7f9b5e7SClaudio Imbrenda err = transport->notify_recv_pre_block( 1757f7f9b5e7SClaudio Imbrenda vsk, target, &recv_data); 1758f7f9b5e7SClaudio Imbrenda if (err < 0) { 1759f7f9b5e7SClaudio Imbrenda finish_wait(sk_sleep(sk), &wait); 1760f7f9b5e7SClaudio Imbrenda break; 1761f7f9b5e7SClaudio Imbrenda } 1762f7f9b5e7SClaudio Imbrenda release_sock(sk); 1763f7f9b5e7SClaudio Imbrenda timeout = schedule_timeout(timeout); 1764f7f9b5e7SClaudio Imbrenda lock_sock(sk); 1765f7f9b5e7SClaudio Imbrenda 1766f7f9b5e7SClaudio Imbrenda if (signal_pending(current)) { 1767f7f9b5e7SClaudio Imbrenda err = sock_intr_errno(timeout); 1768f7f9b5e7SClaudio Imbrenda finish_wait(sk_sleep(sk), &wait); 1769f7f9b5e7SClaudio Imbrenda break; 1770f7f9b5e7SClaudio Imbrenda } else if (timeout == 0) { 1771f7f9b5e7SClaudio Imbrenda err = -EAGAIN; 1772f7f9b5e7SClaudio Imbrenda finish_wait(sk_sleep(sk), &wait); 1773f7f9b5e7SClaudio Imbrenda break; 1774f7f9b5e7SClaudio Imbrenda } 1775f7f9b5e7SClaudio Imbrenda } else { 1776f7f9b5e7SClaudio Imbrenda ssize_t read; 1777f7f9b5e7SClaudio Imbrenda 1778f7f9b5e7SClaudio Imbrenda finish_wait(sk_sleep(sk), &wait); 1779d021c344SAndy King 1780d021c344SAndy King if (ready < 0) { 1781f7f9b5e7SClaudio Imbrenda /* Invalid queue pair content. XXX This should 1782f7f9b5e7SClaudio Imbrenda * be changed to a connection reset in a later 1783f7f9b5e7SClaudio Imbrenda * change. 1784d021c344SAndy King */ 1785d021c344SAndy King 1786d021c344SAndy King err = -ENOMEM; 1787f7f9b5e7SClaudio Imbrenda goto out; 1788f7f9b5e7SClaudio Imbrenda } 1789d021c344SAndy King 1790d021c344SAndy King err = transport->notify_recv_pre_dequeue( 1791d021c344SAndy King vsk, target, &recv_data); 1792d021c344SAndy King if (err < 0) 1793d021c344SAndy King break; 1794d021c344SAndy King 1795d021c344SAndy King read = transport->stream_dequeue( 17960f7db23aSAl Viro vsk, msg, 1797d021c344SAndy King len - copied, flags); 1798d021c344SAndy King if (read < 0) { 1799d021c344SAndy King err = -ENOMEM; 1800d021c344SAndy King break; 1801d021c344SAndy King } 1802d021c344SAndy King 1803d021c344SAndy King copied += read; 1804d021c344SAndy King 1805d021c344SAndy King err = transport->notify_recv_post_dequeue( 1806d021c344SAndy King vsk, target, read, 1807d021c344SAndy King !(flags & MSG_PEEK), &recv_data); 1808d021c344SAndy King if (err < 0) 1809f7f9b5e7SClaudio Imbrenda goto out; 1810d021c344SAndy King 1811d021c344SAndy King if (read >= target || flags & MSG_PEEK) 1812d021c344SAndy King break; 1813d021c344SAndy King 1814d021c344SAndy King target -= read; 1815d021c344SAndy King } 1816d021c344SAndy King } 1817d021c344SAndy King 1818d021c344SAndy King if (sk->sk_err) 1819d021c344SAndy King err = -sk->sk_err; 1820d021c344SAndy King else if (sk->sk_shutdown & RCV_SHUTDOWN) 1821d021c344SAndy King err = 0; 1822d021c344SAndy King 1823dedc58e0SIan Campbell if (copied > 0) 1824d021c344SAndy King err = copied; 1825d021c344SAndy King 1826d021c344SAndy King out: 1827d021c344SAndy King release_sock(sk); 1828d021c344SAndy King return err; 1829d021c344SAndy King } 1830d021c344SAndy King 1831d021c344SAndy King static const struct proto_ops vsock_stream_ops = { 1832d021c344SAndy King .family = PF_VSOCK, 1833d021c344SAndy King .owner = THIS_MODULE, 1834d021c344SAndy King .release = vsock_release, 1835d021c344SAndy King .bind = vsock_bind, 1836d021c344SAndy King .connect = vsock_stream_connect, 1837d021c344SAndy King .socketpair = sock_no_socketpair, 1838d021c344SAndy King .accept = vsock_accept, 1839d021c344SAndy King .getname = vsock_getname, 1840d021c344SAndy King .poll = vsock_poll, 1841d021c344SAndy King .ioctl = sock_no_ioctl, 1842d021c344SAndy King .listen = vsock_listen, 1843d021c344SAndy King .shutdown = vsock_shutdown, 1844d021c344SAndy King .setsockopt = vsock_stream_setsockopt, 1845d021c344SAndy King .getsockopt = vsock_stream_getsockopt, 1846d021c344SAndy King .sendmsg = vsock_stream_sendmsg, 1847d021c344SAndy King .recvmsg = vsock_stream_recvmsg, 1848d021c344SAndy King .mmap = sock_no_mmap, 1849d021c344SAndy King .sendpage = sock_no_sendpage, 1850d021c344SAndy King }; 1851d021c344SAndy King 1852d021c344SAndy King static int vsock_create(struct net *net, struct socket *sock, 1853d021c344SAndy King int protocol, int kern) 1854d021c344SAndy King { 1855d021c344SAndy King if (!sock) 1856d021c344SAndy King return -EINVAL; 1857d021c344SAndy King 18586cf1c5fcSAndy King if (protocol && protocol != PF_VSOCK) 1859d021c344SAndy King return -EPROTONOSUPPORT; 1860d021c344SAndy King 1861d021c344SAndy King switch (sock->type) { 1862d021c344SAndy King case SOCK_DGRAM: 1863d021c344SAndy King sock->ops = &vsock_dgram_ops; 1864d021c344SAndy King break; 1865d021c344SAndy King case SOCK_STREAM: 1866d021c344SAndy King sock->ops = &vsock_stream_ops; 1867d021c344SAndy King break; 1868d021c344SAndy King default: 1869d021c344SAndy King return -ESOCKTNOSUPPORT; 1870d021c344SAndy King } 1871d021c344SAndy King 1872d021c344SAndy King sock->state = SS_UNCONNECTED; 1873d021c344SAndy King 187411aa9c28SEric W. Biederman return __vsock_create(net, sock, NULL, GFP_KERNEL, 0, kern) ? 0 : -ENOMEM; 1875d021c344SAndy King } 1876d021c344SAndy King 1877d021c344SAndy King static const struct net_proto_family vsock_family_ops = { 1878d021c344SAndy King .family = AF_VSOCK, 1879d021c344SAndy King .create = vsock_create, 1880d021c344SAndy King .owner = THIS_MODULE, 1881d021c344SAndy King }; 1882d021c344SAndy King 1883d021c344SAndy King static long vsock_dev_do_ioctl(struct file *filp, 1884d021c344SAndy King unsigned int cmd, void __user *ptr) 1885d021c344SAndy King { 1886d021c344SAndy King u32 __user *p = ptr; 1887d021c344SAndy King int retval = 0; 1888d021c344SAndy King 1889d021c344SAndy King switch (cmd) { 1890d021c344SAndy King case IOCTL_VM_SOCKETS_GET_LOCAL_CID: 1891d021c344SAndy King if (put_user(transport->get_local_cid(), p) != 0) 1892d021c344SAndy King retval = -EFAULT; 1893d021c344SAndy King break; 1894d021c344SAndy King 1895d021c344SAndy King default: 1896d021c344SAndy King pr_err("Unknown ioctl %d\n", cmd); 1897d021c344SAndy King retval = -EINVAL; 1898d021c344SAndy King } 1899d021c344SAndy King 1900d021c344SAndy King return retval; 1901d021c344SAndy King } 1902d021c344SAndy King 1903d021c344SAndy King static long vsock_dev_ioctl(struct file *filp, 1904d021c344SAndy King unsigned int cmd, unsigned long arg) 1905d021c344SAndy King { 1906d021c344SAndy King return vsock_dev_do_ioctl(filp, cmd, (void __user *)arg); 1907d021c344SAndy King } 1908d021c344SAndy King 1909d021c344SAndy King #ifdef CONFIG_COMPAT 1910d021c344SAndy King static long vsock_dev_compat_ioctl(struct file *filp, 1911d021c344SAndy King unsigned int cmd, unsigned long arg) 1912d021c344SAndy King { 1913d021c344SAndy King return vsock_dev_do_ioctl(filp, cmd, compat_ptr(arg)); 1914d021c344SAndy King } 1915d021c344SAndy King #endif 1916d021c344SAndy King 1917d021c344SAndy King static const struct file_operations vsock_device_ops = { 1918d021c344SAndy King .owner = THIS_MODULE, 1919d021c344SAndy King .unlocked_ioctl = vsock_dev_ioctl, 1920d021c344SAndy King #ifdef CONFIG_COMPAT 1921d021c344SAndy King .compat_ioctl = vsock_dev_compat_ioctl, 1922d021c344SAndy King #endif 1923d021c344SAndy King .open = nonseekable_open, 1924d021c344SAndy King }; 1925d021c344SAndy King 1926d021c344SAndy King static struct miscdevice vsock_device = { 1927d021c344SAndy King .name = "vsock", 1928d021c344SAndy King .fops = &vsock_device_ops, 1929d021c344SAndy King }; 1930d021c344SAndy King 19312c4a336eSAndy King int __vsock_core_init(const struct vsock_transport *t, struct module *owner) 1932d021c344SAndy King { 19332c4a336eSAndy King int err = mutex_lock_interruptible(&vsock_register_mutex); 19342c4a336eSAndy King 19352c4a336eSAndy King if (err) 19362c4a336eSAndy King return err; 19372c4a336eSAndy King 19382c4a336eSAndy King if (transport) { 19392c4a336eSAndy King err = -EBUSY; 19402c4a336eSAndy King goto err_busy; 19412c4a336eSAndy King } 19422c4a336eSAndy King 19432c4a336eSAndy King /* Transport must be the owner of the protocol so that it can't 19442c4a336eSAndy King * unload while there are open sockets. 19452c4a336eSAndy King */ 19462c4a336eSAndy King vsock_proto.owner = owner; 19472c4a336eSAndy King transport = t; 1948d021c344SAndy King 1949d021c344SAndy King vsock_init_tables(); 1950d021c344SAndy King 19516ad0b2f7SAsias He vsock_device.minor = MISC_DYNAMIC_MINOR; 1952d021c344SAndy King err = misc_register(&vsock_device); 1953d021c344SAndy King if (err) { 1954d021c344SAndy King pr_err("Failed to register misc device\n"); 1955f6a835bbSGao feng goto err_reset_transport; 1956d021c344SAndy King } 1957d021c344SAndy King 1958d021c344SAndy King err = proto_register(&vsock_proto, 1); /* we want our slab */ 1959d021c344SAndy King if (err) { 1960d021c344SAndy King pr_err("Cannot register vsock protocol\n"); 1961f6a835bbSGao feng goto err_deregister_misc; 1962d021c344SAndy King } 1963d021c344SAndy King 1964d021c344SAndy King err = sock_register(&vsock_family_ops); 1965d021c344SAndy King if (err) { 1966d021c344SAndy King pr_err("could not register af_vsock (%d) address family: %d\n", 1967d021c344SAndy King AF_VSOCK, err); 1968d021c344SAndy King goto err_unregister_proto; 1969d021c344SAndy King } 1970d021c344SAndy King 19712c4a336eSAndy King mutex_unlock(&vsock_register_mutex); 1972d021c344SAndy King return 0; 1973d021c344SAndy King 1974d021c344SAndy King err_unregister_proto: 1975d021c344SAndy King proto_unregister(&vsock_proto); 1976f6a835bbSGao feng err_deregister_misc: 1977d021c344SAndy King misc_deregister(&vsock_device); 1978f6a835bbSGao feng err_reset_transport: 19792c4a336eSAndy King transport = NULL; 19802c4a336eSAndy King err_busy: 19812c4a336eSAndy King mutex_unlock(&vsock_register_mutex); 1982d021c344SAndy King return err; 1983d021c344SAndy King } 19842c4a336eSAndy King EXPORT_SYMBOL_GPL(__vsock_core_init); 1985d021c344SAndy King 1986d021c344SAndy King void vsock_core_exit(void) 1987d021c344SAndy King { 1988d021c344SAndy King mutex_lock(&vsock_register_mutex); 1989d021c344SAndy King 1990d021c344SAndy King misc_deregister(&vsock_device); 1991d021c344SAndy King sock_unregister(AF_VSOCK); 1992d021c344SAndy King proto_unregister(&vsock_proto); 1993d021c344SAndy King 1994d021c344SAndy King /* We do not want the assignment below re-ordered. */ 1995d021c344SAndy King mb(); 1996d021c344SAndy King transport = NULL; 1997d021c344SAndy King 1998d021c344SAndy King mutex_unlock(&vsock_register_mutex); 1999d021c344SAndy King } 2000d021c344SAndy King EXPORT_SYMBOL_GPL(vsock_core_exit); 2001d021c344SAndy King 20020b01aeb3SStefan Hajnoczi const struct vsock_transport *vsock_core_get_transport(void) 20030b01aeb3SStefan Hajnoczi { 20040b01aeb3SStefan Hajnoczi /* vsock_register_mutex not taken since only the transport uses this 20050b01aeb3SStefan Hajnoczi * function and only while registered. 20060b01aeb3SStefan Hajnoczi */ 20070b01aeb3SStefan Hajnoczi return transport; 20080b01aeb3SStefan Hajnoczi } 20090b01aeb3SStefan Hajnoczi EXPORT_SYMBOL_GPL(vsock_core_get_transport); 20100b01aeb3SStefan Hajnoczi 2011d021c344SAndy King MODULE_AUTHOR("VMware, Inc."); 2012d021c344SAndy King MODULE_DESCRIPTION("VMware Virtual Socket Family"); 20132c4a336eSAndy King MODULE_VERSION("1.0.1.0-k"); 2014d021c344SAndy King MODULE_LICENSE("GPL v2"); 2015