1685a6bf8SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only 2d021c344SAndy King /* 3d021c344SAndy King * VMware vSockets Driver 4d021c344SAndy King * 5d021c344SAndy King * Copyright (C) 2007-2013 VMware, Inc. All rights reserved. 6d021c344SAndy King */ 7d021c344SAndy King 8d021c344SAndy King /* Implementation notes: 9d021c344SAndy King * 10d021c344SAndy King * - There are two kinds of sockets: those created by user action (such as 11d021c344SAndy King * calling socket(2)) and those created by incoming connection request packets. 12d021c344SAndy King * 13d021c344SAndy King * - There are two "global" tables, one for bound sockets (sockets that have 14d021c344SAndy King * specified an address that they are responsible for) and one for connected 15d021c344SAndy King * sockets (sockets that have established a connection with another socket). 16d021c344SAndy King * These tables are "global" in that all sockets on the system are placed 17d021c344SAndy King * within them. - Note, though, that the bound table contains an extra entry 18d021c344SAndy King * for a list of unbound sockets and SOCK_DGRAM sockets will always remain in 19d021c344SAndy King * that list. The bound table is used solely for lookup of sockets when packets 20d021c344SAndy King * are received and that's not necessary for SOCK_DGRAM sockets since we create 21d021c344SAndy King * a datagram handle for each and need not perform a lookup. Keeping SOCK_DGRAM 22d021c344SAndy King * sockets out of the bound hash buckets will reduce the chance of collisions 23d021c344SAndy King * when looking for SOCK_STREAM sockets and prevents us from having to check the 24d021c344SAndy King * socket type in the hash table lookups. 25d021c344SAndy King * 26d021c344SAndy King * - Sockets created by user action will either be "client" sockets that 27d021c344SAndy King * initiate a connection or "server" sockets that listen for connections; we do 28d021c344SAndy King * not support simultaneous connects (two "client" sockets connecting). 29d021c344SAndy King * 30d021c344SAndy King * - "Server" sockets are referred to as listener sockets throughout this 313b4477d2SStefan Hajnoczi * implementation because they are in the TCP_LISTEN state. When a 32ea3803c1SStefan Hajnoczi * connection request is received (the second kind of socket mentioned above), 33ea3803c1SStefan Hajnoczi * we create a new socket and refer to it as a pending socket. These pending 34ea3803c1SStefan Hajnoczi * sockets are placed on the pending connection list of the listener socket. 35ea3803c1SStefan Hajnoczi * When future packets are received for the address the listener socket is 36ea3803c1SStefan Hajnoczi * bound to, we check if the source of the packet is from one that has an 37ea3803c1SStefan Hajnoczi * existing pending connection. If it does, we process the packet for the 38ea3803c1SStefan Hajnoczi * pending socket. When that socket reaches the connected state, it is removed 39ea3803c1SStefan Hajnoczi * from the listener socket's pending list and enqueued in the listener 40ea3803c1SStefan Hajnoczi * socket's accept queue. Callers of accept(2) will accept connected sockets 41ea3803c1SStefan Hajnoczi * from the listener socket's accept queue. If the socket cannot be accepted 42ea3803c1SStefan Hajnoczi * for some reason then it is marked rejected. Once the connection is 43ea3803c1SStefan Hajnoczi * accepted, it is owned by the user process and the responsibility for cleanup 44ea3803c1SStefan Hajnoczi * falls with that user process. 45d021c344SAndy King * 46d021c344SAndy King * - It is possible that these pending sockets will never reach the connected 47d021c344SAndy King * state; in fact, we may never receive another packet after the connection 48d021c344SAndy King * request. Because of this, we must schedule a cleanup function to run in the 49d021c344SAndy King * future, after some amount of time passes where a connection should have been 50d021c344SAndy King * established. This function ensures that the socket is off all lists so it 51d021c344SAndy King * cannot be retrieved, then drops all references to the socket so it is cleaned 52d021c344SAndy King * up (sock_put() -> sk_free() -> our sk_destruct implementation). Note this 53d021c344SAndy King * function will also cleanup rejected sockets, those that reach the connected 54d021c344SAndy King * state but leave it before they have been accepted. 55d021c344SAndy King * 564192f672SStefan Hajnoczi * - Lock ordering for pending or accept queue sockets is: 574192f672SStefan Hajnoczi * 584192f672SStefan Hajnoczi * lock_sock(listener); 594192f672SStefan Hajnoczi * lock_sock_nested(pending, SINGLE_DEPTH_NESTING); 604192f672SStefan Hajnoczi * 614192f672SStefan Hajnoczi * Using explicit nested locking keeps lockdep happy since normally only one 624192f672SStefan Hajnoczi * lock of a given class may be taken at a time. 634192f672SStefan Hajnoczi * 64d021c344SAndy King * - Sockets created by user action will be cleaned up when the user process 65d021c344SAndy King * calls close(2), causing our release implementation to be called. Our release 66d021c344SAndy King * implementation will perform some cleanup then drop the last reference so our 67d021c344SAndy King * sk_destruct implementation is invoked. Our sk_destruct implementation will 68d021c344SAndy King * perform additional cleanup that's common for both types of sockets. 69d021c344SAndy King * 70d021c344SAndy King * - A socket's reference count is what ensures that the structure won't be 71d021c344SAndy King * freed. Each entry in a list (such as the "global" bound and connected tables 72d021c344SAndy King * and the listener socket's pending list and connected queue) ensures a 73d021c344SAndy King * reference. When we defer work until process context and pass a socket as our 74d021c344SAndy King * argument, we must ensure the reference count is increased to ensure the 75d021c344SAndy King * socket isn't freed before the function is run; the deferred function will 76d021c344SAndy King * then drop the reference. 773b4477d2SStefan Hajnoczi * 783b4477d2SStefan Hajnoczi * - sk->sk_state uses the TCP state constants because they are widely used by 793b4477d2SStefan Hajnoczi * other address families and exposed to userspace tools like ss(8): 803b4477d2SStefan Hajnoczi * 813b4477d2SStefan Hajnoczi * TCP_CLOSE - unconnected 823b4477d2SStefan Hajnoczi * TCP_SYN_SENT - connecting 833b4477d2SStefan Hajnoczi * TCP_ESTABLISHED - connected 843b4477d2SStefan Hajnoczi * TCP_CLOSING - disconnecting 853b4477d2SStefan Hajnoczi * TCP_LISTEN - listening 86d021c344SAndy King */ 87d021c344SAndy King 88d021c344SAndy King #include <linux/types.h> 89d021c344SAndy King #include <linux/bitops.h> 90d021c344SAndy King #include <linux/cred.h> 91d021c344SAndy King #include <linux/init.h> 92d021c344SAndy King #include <linux/io.h> 93d021c344SAndy King #include <linux/kernel.h> 94174cd4b1SIngo Molnar #include <linux/sched/signal.h> 95d021c344SAndy King #include <linux/kmod.h> 96d021c344SAndy King #include <linux/list.h> 97d021c344SAndy King #include <linux/miscdevice.h> 98d021c344SAndy King #include <linux/module.h> 99d021c344SAndy King #include <linux/mutex.h> 100d021c344SAndy King #include <linux/net.h> 101d021c344SAndy King #include <linux/poll.h> 1028236b08cSLepton Wu #include <linux/random.h> 103d021c344SAndy King #include <linux/skbuff.h> 104d021c344SAndy King #include <linux/smp.h> 105d021c344SAndy King #include <linux/socket.h> 106d021c344SAndy King #include <linux/stddef.h> 107d021c344SAndy King #include <linux/unistd.h> 108d021c344SAndy King #include <linux/wait.h> 109d021c344SAndy King #include <linux/workqueue.h> 110d021c344SAndy King #include <net/sock.h> 11182a54d0eSAsias He #include <net/af_vsock.h> 112d021c344SAndy King 113d021c344SAndy King static int __vsock_bind(struct sock *sk, struct sockaddr_vm *addr); 114d021c344SAndy King static void vsock_sk_destruct(struct sock *sk); 115d021c344SAndy King static int vsock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb); 116d021c344SAndy King 117d021c344SAndy King /* Protocol family. */ 118d021c344SAndy King static struct proto vsock_proto = { 119d021c344SAndy King .name = "AF_VSOCK", 120d021c344SAndy King .owner = THIS_MODULE, 121d021c344SAndy King .obj_size = sizeof(struct vsock_sock), 122d021c344SAndy King }; 123d021c344SAndy King 124d021c344SAndy King /* The default peer timeout indicates how long we will wait for a peer response 125d021c344SAndy King * to a control message. 126d021c344SAndy King */ 127d021c344SAndy King #define VSOCK_DEFAULT_CONNECT_TIMEOUT (2 * HZ) 128d021c344SAndy King 129d021c344SAndy King static const struct vsock_transport *transport; 130d021c344SAndy King static DEFINE_MUTEX(vsock_register_mutex); 131d021c344SAndy King 132d021c344SAndy King /**** EXPORTS ****/ 133d021c344SAndy King 134d021c344SAndy King /* Get the ID of the local context. This is transport dependent. */ 135d021c344SAndy King 136d021c344SAndy King int vm_sockets_get_local_cid(void) 137d021c344SAndy King { 138d021c344SAndy King return transport->get_local_cid(); 139d021c344SAndy King } 140d021c344SAndy King EXPORT_SYMBOL_GPL(vm_sockets_get_local_cid); 141d021c344SAndy King 142d021c344SAndy King /**** UTILS ****/ 143d021c344SAndy King 144d021c344SAndy King /* Each bound VSocket is stored in the bind hash table and each connected 145d021c344SAndy King * VSocket is stored in the connected hash table. 146d021c344SAndy King * 147d021c344SAndy King * Unbound sockets are all put on the same list attached to the end of the hash 148d021c344SAndy King * table (vsock_unbound_sockets). Bound sockets are added to the hash table in 149d021c344SAndy King * the bucket that their local address hashes to (vsock_bound_sockets(addr) 150d021c344SAndy King * represents the list that addr hashes to). 151d021c344SAndy King * 152d021c344SAndy King * Specifically, we initialize the vsock_bind_table array to a size of 153d021c344SAndy King * VSOCK_HASH_SIZE + 1 so that vsock_bind_table[0] through 154d021c344SAndy King * vsock_bind_table[VSOCK_HASH_SIZE - 1] are for bound sockets and 155d021c344SAndy King * vsock_bind_table[VSOCK_HASH_SIZE] is for unbound sockets. The hash function 156a49dd9dcSAsias He * mods with VSOCK_HASH_SIZE to ensure this. 157d021c344SAndy King */ 158d021c344SAndy King #define MAX_PORT_RETRIES 24 159d021c344SAndy King 160a49dd9dcSAsias He #define VSOCK_HASH(addr) ((addr)->svm_port % VSOCK_HASH_SIZE) 161d021c344SAndy King #define vsock_bound_sockets(addr) (&vsock_bind_table[VSOCK_HASH(addr)]) 162d021c344SAndy King #define vsock_unbound_sockets (&vsock_bind_table[VSOCK_HASH_SIZE]) 163d021c344SAndy King 164d021c344SAndy King /* XXX This can probably be implemented in a better way. */ 165d021c344SAndy King #define VSOCK_CONN_HASH(src, dst) \ 166a49dd9dcSAsias He (((src)->svm_cid ^ (dst)->svm_port) % VSOCK_HASH_SIZE) 167d021c344SAndy King #define vsock_connected_sockets(src, dst) \ 168d021c344SAndy King (&vsock_connected_table[VSOCK_CONN_HASH(src, dst)]) 169d021c344SAndy King #define vsock_connected_sockets_vsk(vsk) \ 170d021c344SAndy King vsock_connected_sockets(&(vsk)->remote_addr, &(vsk)->local_addr) 171d021c344SAndy King 17244f20980SStefan Hajnoczi struct list_head vsock_bind_table[VSOCK_HASH_SIZE + 1]; 17344f20980SStefan Hajnoczi EXPORT_SYMBOL_GPL(vsock_bind_table); 17444f20980SStefan Hajnoczi struct list_head vsock_connected_table[VSOCK_HASH_SIZE]; 17544f20980SStefan Hajnoczi EXPORT_SYMBOL_GPL(vsock_connected_table); 17644f20980SStefan Hajnoczi DEFINE_SPINLOCK(vsock_table_lock); 17744f20980SStefan Hajnoczi EXPORT_SYMBOL_GPL(vsock_table_lock); 178d021c344SAndy King 179b3a6dfe8SAsias He /* Autobind this socket to the local address if necessary. */ 180b3a6dfe8SAsias He static int vsock_auto_bind(struct vsock_sock *vsk) 181b3a6dfe8SAsias He { 182b3a6dfe8SAsias He struct sock *sk = sk_vsock(vsk); 183b3a6dfe8SAsias He struct sockaddr_vm local_addr; 184b3a6dfe8SAsias He 185b3a6dfe8SAsias He if (vsock_addr_bound(&vsk->local_addr)) 186b3a6dfe8SAsias He return 0; 187b3a6dfe8SAsias He vsock_addr_init(&local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); 188b3a6dfe8SAsias He return __vsock_bind(sk, &local_addr); 189b3a6dfe8SAsias He } 190b3a6dfe8SAsias He 191c1eef220SCong Wang static int __init vsock_init_tables(void) 192d021c344SAndy King { 193d021c344SAndy King int i; 194d021c344SAndy King 195d021c344SAndy King for (i = 0; i < ARRAY_SIZE(vsock_bind_table); i++) 196d021c344SAndy King INIT_LIST_HEAD(&vsock_bind_table[i]); 197d021c344SAndy King 198d021c344SAndy King for (i = 0; i < ARRAY_SIZE(vsock_connected_table); i++) 199d021c344SAndy King INIT_LIST_HEAD(&vsock_connected_table[i]); 200c1eef220SCong Wang return 0; 201d021c344SAndy King } 202d021c344SAndy King 203d021c344SAndy King static void __vsock_insert_bound(struct list_head *list, 204d021c344SAndy King struct vsock_sock *vsk) 205d021c344SAndy King { 206d021c344SAndy King sock_hold(&vsk->sk); 207d021c344SAndy King list_add(&vsk->bound_table, list); 208d021c344SAndy King } 209d021c344SAndy King 210d021c344SAndy King static void __vsock_insert_connected(struct list_head *list, 211d021c344SAndy King struct vsock_sock *vsk) 212d021c344SAndy King { 213d021c344SAndy King sock_hold(&vsk->sk); 214d021c344SAndy King list_add(&vsk->connected_table, list); 215d021c344SAndy King } 216d021c344SAndy King 217d021c344SAndy King static void __vsock_remove_bound(struct vsock_sock *vsk) 218d021c344SAndy King { 219d021c344SAndy King list_del_init(&vsk->bound_table); 220d021c344SAndy King sock_put(&vsk->sk); 221d021c344SAndy King } 222d021c344SAndy King 223d021c344SAndy King static void __vsock_remove_connected(struct vsock_sock *vsk) 224d021c344SAndy King { 225d021c344SAndy King list_del_init(&vsk->connected_table); 226d021c344SAndy King sock_put(&vsk->sk); 227d021c344SAndy King } 228d021c344SAndy King 229d021c344SAndy King static struct sock *__vsock_find_bound_socket(struct sockaddr_vm *addr) 230d021c344SAndy King { 231d021c344SAndy King struct vsock_sock *vsk; 232d021c344SAndy King 233d021c344SAndy King list_for_each_entry(vsk, vsock_bound_sockets(addr), bound_table) 234990454b5SReilly Grant if (addr->svm_port == vsk->local_addr.svm_port) 235d021c344SAndy King return sk_vsock(vsk); 236d021c344SAndy King 237d021c344SAndy King return NULL; 238d021c344SAndy King } 239d021c344SAndy King 240d021c344SAndy King static struct sock *__vsock_find_connected_socket(struct sockaddr_vm *src, 241d021c344SAndy King struct sockaddr_vm *dst) 242d021c344SAndy King { 243d021c344SAndy King struct vsock_sock *vsk; 244d021c344SAndy King 245d021c344SAndy King list_for_each_entry(vsk, vsock_connected_sockets(src, dst), 246d021c344SAndy King connected_table) { 247990454b5SReilly Grant if (vsock_addr_equals_addr(src, &vsk->remote_addr) && 248990454b5SReilly Grant dst->svm_port == vsk->local_addr.svm_port) { 249d021c344SAndy King return sk_vsock(vsk); 250d021c344SAndy King } 251d021c344SAndy King } 252d021c344SAndy King 253d021c344SAndy King return NULL; 254d021c344SAndy King } 255d021c344SAndy King 256d021c344SAndy King static void vsock_insert_unbound(struct vsock_sock *vsk) 257d021c344SAndy King { 258d021c344SAndy King spin_lock_bh(&vsock_table_lock); 259d021c344SAndy King __vsock_insert_bound(vsock_unbound_sockets, vsk); 260d021c344SAndy King spin_unlock_bh(&vsock_table_lock); 261d021c344SAndy King } 262d021c344SAndy King 263d021c344SAndy King void vsock_insert_connected(struct vsock_sock *vsk) 264d021c344SAndy King { 265d021c344SAndy King struct list_head *list = vsock_connected_sockets( 266d021c344SAndy King &vsk->remote_addr, &vsk->local_addr); 267d021c344SAndy King 268d021c344SAndy King spin_lock_bh(&vsock_table_lock); 269d021c344SAndy King __vsock_insert_connected(list, vsk); 270d021c344SAndy King spin_unlock_bh(&vsock_table_lock); 271d021c344SAndy King } 272d021c344SAndy King EXPORT_SYMBOL_GPL(vsock_insert_connected); 273d021c344SAndy King 274d021c344SAndy King void vsock_remove_bound(struct vsock_sock *vsk) 275d021c344SAndy King { 276d021c344SAndy King spin_lock_bh(&vsock_table_lock); 277d5afa82cSSunil Muthuswamy if (__vsock_in_bound_table(vsk)) 278d021c344SAndy King __vsock_remove_bound(vsk); 279d021c344SAndy King spin_unlock_bh(&vsock_table_lock); 280d021c344SAndy King } 281d021c344SAndy King EXPORT_SYMBOL_GPL(vsock_remove_bound); 282d021c344SAndy King 283d021c344SAndy King void vsock_remove_connected(struct vsock_sock *vsk) 284d021c344SAndy King { 285d021c344SAndy King spin_lock_bh(&vsock_table_lock); 286d5afa82cSSunil Muthuswamy if (__vsock_in_connected_table(vsk)) 287d021c344SAndy King __vsock_remove_connected(vsk); 288d021c344SAndy King spin_unlock_bh(&vsock_table_lock); 289d021c344SAndy King } 290d021c344SAndy King EXPORT_SYMBOL_GPL(vsock_remove_connected); 291d021c344SAndy King 292d021c344SAndy King struct sock *vsock_find_bound_socket(struct sockaddr_vm *addr) 293d021c344SAndy King { 294d021c344SAndy King struct sock *sk; 295d021c344SAndy King 296d021c344SAndy King spin_lock_bh(&vsock_table_lock); 297d021c344SAndy King sk = __vsock_find_bound_socket(addr); 298d021c344SAndy King if (sk) 299d021c344SAndy King sock_hold(sk); 300d021c344SAndy King 301d021c344SAndy King spin_unlock_bh(&vsock_table_lock); 302d021c344SAndy King 303d021c344SAndy King return sk; 304d021c344SAndy King } 305d021c344SAndy King EXPORT_SYMBOL_GPL(vsock_find_bound_socket); 306d021c344SAndy King 307d021c344SAndy King struct sock *vsock_find_connected_socket(struct sockaddr_vm *src, 308d021c344SAndy King struct sockaddr_vm *dst) 309d021c344SAndy King { 310d021c344SAndy King struct sock *sk; 311d021c344SAndy King 312d021c344SAndy King spin_lock_bh(&vsock_table_lock); 313d021c344SAndy King sk = __vsock_find_connected_socket(src, dst); 314d021c344SAndy King if (sk) 315d021c344SAndy King sock_hold(sk); 316d021c344SAndy King 317d021c344SAndy King spin_unlock_bh(&vsock_table_lock); 318d021c344SAndy King 319d021c344SAndy King return sk; 320d021c344SAndy King } 321d021c344SAndy King EXPORT_SYMBOL_GPL(vsock_find_connected_socket); 322d021c344SAndy King 3236773b7dcSStefan Hajnoczi void vsock_remove_sock(struct vsock_sock *vsk) 3246773b7dcSStefan Hajnoczi { 3256773b7dcSStefan Hajnoczi vsock_remove_bound(vsk); 3266773b7dcSStefan Hajnoczi vsock_remove_connected(vsk); 3276773b7dcSStefan Hajnoczi } 3286773b7dcSStefan Hajnoczi EXPORT_SYMBOL_GPL(vsock_remove_sock); 3296773b7dcSStefan Hajnoczi 330d021c344SAndy King void vsock_for_each_connected_socket(void (*fn)(struct sock *sk)) 331d021c344SAndy King { 332d021c344SAndy King int i; 333d021c344SAndy King 334d021c344SAndy King spin_lock_bh(&vsock_table_lock); 335d021c344SAndy King 336d021c344SAndy King for (i = 0; i < ARRAY_SIZE(vsock_connected_table); i++) { 337d021c344SAndy King struct vsock_sock *vsk; 338d021c344SAndy King list_for_each_entry(vsk, &vsock_connected_table[i], 339d9af2d67SJulia Lawall connected_table) 340d021c344SAndy King fn(sk_vsock(vsk)); 341d021c344SAndy King } 342d021c344SAndy King 343d021c344SAndy King spin_unlock_bh(&vsock_table_lock); 344d021c344SAndy King } 345d021c344SAndy King EXPORT_SYMBOL_GPL(vsock_for_each_connected_socket); 346d021c344SAndy King 347d021c344SAndy King void vsock_add_pending(struct sock *listener, struct sock *pending) 348d021c344SAndy King { 349d021c344SAndy King struct vsock_sock *vlistener; 350d021c344SAndy King struct vsock_sock *vpending; 351d021c344SAndy King 352d021c344SAndy King vlistener = vsock_sk(listener); 353d021c344SAndy King vpending = vsock_sk(pending); 354d021c344SAndy King 355d021c344SAndy King sock_hold(pending); 356d021c344SAndy King sock_hold(listener); 357d021c344SAndy King list_add_tail(&vpending->pending_links, &vlistener->pending_links); 358d021c344SAndy King } 359d021c344SAndy King EXPORT_SYMBOL_GPL(vsock_add_pending); 360d021c344SAndy King 361d021c344SAndy King void vsock_remove_pending(struct sock *listener, struct sock *pending) 362d021c344SAndy King { 363d021c344SAndy King struct vsock_sock *vpending = vsock_sk(pending); 364d021c344SAndy King 365d021c344SAndy King list_del_init(&vpending->pending_links); 366d021c344SAndy King sock_put(listener); 367d021c344SAndy King sock_put(pending); 368d021c344SAndy King } 369d021c344SAndy King EXPORT_SYMBOL_GPL(vsock_remove_pending); 370d021c344SAndy King 371d021c344SAndy King void vsock_enqueue_accept(struct sock *listener, struct sock *connected) 372d021c344SAndy King { 373d021c344SAndy King struct vsock_sock *vlistener; 374d021c344SAndy King struct vsock_sock *vconnected; 375d021c344SAndy King 376d021c344SAndy King vlistener = vsock_sk(listener); 377d021c344SAndy King vconnected = vsock_sk(connected); 378d021c344SAndy King 379d021c344SAndy King sock_hold(connected); 380d021c344SAndy King sock_hold(listener); 381d021c344SAndy King list_add_tail(&vconnected->accept_queue, &vlistener->accept_queue); 382d021c344SAndy King } 383d021c344SAndy King EXPORT_SYMBOL_GPL(vsock_enqueue_accept); 384d021c344SAndy King 385d021c344SAndy King static struct sock *vsock_dequeue_accept(struct sock *listener) 386d021c344SAndy King { 387d021c344SAndy King struct vsock_sock *vlistener; 388d021c344SAndy King struct vsock_sock *vconnected; 389d021c344SAndy King 390d021c344SAndy King vlistener = vsock_sk(listener); 391d021c344SAndy King 392d021c344SAndy King if (list_empty(&vlistener->accept_queue)) 393d021c344SAndy King return NULL; 394d021c344SAndy King 395d021c344SAndy King vconnected = list_entry(vlistener->accept_queue.next, 396d021c344SAndy King struct vsock_sock, accept_queue); 397d021c344SAndy King 398d021c344SAndy King list_del_init(&vconnected->accept_queue); 399d021c344SAndy King sock_put(listener); 400d021c344SAndy King /* The caller will need a reference on the connected socket so we let 401d021c344SAndy King * it call sock_put(). 402d021c344SAndy King */ 403d021c344SAndy King 404d021c344SAndy King return sk_vsock(vconnected); 405d021c344SAndy King } 406d021c344SAndy King 407d021c344SAndy King static bool vsock_is_accept_queue_empty(struct sock *sk) 408d021c344SAndy King { 409d021c344SAndy King struct vsock_sock *vsk = vsock_sk(sk); 410d021c344SAndy King return list_empty(&vsk->accept_queue); 411d021c344SAndy King } 412d021c344SAndy King 413d021c344SAndy King static bool vsock_is_pending(struct sock *sk) 414d021c344SAndy King { 415d021c344SAndy King struct vsock_sock *vsk = vsock_sk(sk); 416d021c344SAndy King return !list_empty(&vsk->pending_links); 417d021c344SAndy King } 418d021c344SAndy King 419d021c344SAndy King static int vsock_send_shutdown(struct sock *sk, int mode) 420d021c344SAndy King { 421d021c344SAndy King return transport->shutdown(vsock_sk(sk), mode); 422d021c344SAndy King } 423d021c344SAndy King 424455f05ecSCong Wang static void vsock_pending_work(struct work_struct *work) 425d021c344SAndy King { 426d021c344SAndy King struct sock *sk; 427d021c344SAndy King struct sock *listener; 428d021c344SAndy King struct vsock_sock *vsk; 429d021c344SAndy King bool cleanup; 430d021c344SAndy King 431455f05ecSCong Wang vsk = container_of(work, struct vsock_sock, pending_work.work); 432d021c344SAndy King sk = sk_vsock(vsk); 433d021c344SAndy King listener = vsk->listener; 434d021c344SAndy King cleanup = true; 435d021c344SAndy King 436d021c344SAndy King lock_sock(listener); 4374192f672SStefan Hajnoczi lock_sock_nested(sk, SINGLE_DEPTH_NESTING); 438d021c344SAndy King 439d021c344SAndy King if (vsock_is_pending(sk)) { 440d021c344SAndy King vsock_remove_pending(listener, sk); 4411190cfdbSJorgen Hansen 4427976a11bSEric Dumazet sk_acceptq_removed(listener); 443d021c344SAndy King } else if (!vsk->rejected) { 444d021c344SAndy King /* We are not on the pending list and accept() did not reject 445d021c344SAndy King * us, so we must have been accepted by our user process. We 446d021c344SAndy King * just need to drop our references to the sockets and be on 447d021c344SAndy King * our way. 448d021c344SAndy King */ 449d021c344SAndy King cleanup = false; 450d021c344SAndy King goto out; 451d021c344SAndy King } 452d021c344SAndy King 453d021c344SAndy King /* We need to remove ourself from the global connected sockets list so 454d021c344SAndy King * incoming packets can't find this socket, and to reduce the reference 455d021c344SAndy King * count. 456d021c344SAndy King */ 457d021c344SAndy King vsock_remove_connected(vsk); 458d021c344SAndy King 4593b4477d2SStefan Hajnoczi sk->sk_state = TCP_CLOSE; 460d021c344SAndy King 461d021c344SAndy King out: 462d021c344SAndy King release_sock(sk); 463d021c344SAndy King release_sock(listener); 464d021c344SAndy King if (cleanup) 465d021c344SAndy King sock_put(sk); 466d021c344SAndy King 467d021c344SAndy King sock_put(sk); 468d021c344SAndy King sock_put(listener); 469d021c344SAndy King } 470d021c344SAndy King 471d021c344SAndy King /**** SOCKET OPERATIONS ****/ 472d021c344SAndy King 473d021c344SAndy King static int __vsock_bind_stream(struct vsock_sock *vsk, 474d021c344SAndy King struct sockaddr_vm *addr) 475d021c344SAndy King { 476a22d3251SLepton Wu static u32 port; 477d021c344SAndy King struct sockaddr_vm new_addr; 478d021c344SAndy King 4798236b08cSLepton Wu if (!port) 4808236b08cSLepton Wu port = LAST_RESERVED_PORT + 1 + 4818236b08cSLepton Wu prandom_u32_max(U32_MAX - LAST_RESERVED_PORT); 4828236b08cSLepton Wu 483d021c344SAndy King vsock_addr_init(&new_addr, addr->svm_cid, addr->svm_port); 484d021c344SAndy King 485d021c344SAndy King if (addr->svm_port == VMADDR_PORT_ANY) { 486d021c344SAndy King bool found = false; 487d021c344SAndy King unsigned int i; 488d021c344SAndy King 489d021c344SAndy King for (i = 0; i < MAX_PORT_RETRIES; i++) { 490d021c344SAndy King if (port <= LAST_RESERVED_PORT) 491d021c344SAndy King port = LAST_RESERVED_PORT + 1; 492d021c344SAndy King 493d021c344SAndy King new_addr.svm_port = port++; 494d021c344SAndy King 495d021c344SAndy King if (!__vsock_find_bound_socket(&new_addr)) { 496d021c344SAndy King found = true; 497d021c344SAndy King break; 498d021c344SAndy King } 499d021c344SAndy King } 500d021c344SAndy King 501d021c344SAndy King if (!found) 502d021c344SAndy King return -EADDRNOTAVAIL; 503d021c344SAndy King } else { 504d021c344SAndy King /* If port is in reserved range, ensure caller 505d021c344SAndy King * has necessary privileges. 506d021c344SAndy King */ 507d021c344SAndy King if (addr->svm_port <= LAST_RESERVED_PORT && 508d021c344SAndy King !capable(CAP_NET_BIND_SERVICE)) { 509d021c344SAndy King return -EACCES; 510d021c344SAndy King } 511d021c344SAndy King 512d021c344SAndy King if (__vsock_find_bound_socket(&new_addr)) 513d021c344SAndy King return -EADDRINUSE; 514d021c344SAndy King } 515d021c344SAndy King 516d021c344SAndy King vsock_addr_init(&vsk->local_addr, new_addr.svm_cid, new_addr.svm_port); 517d021c344SAndy King 518d021c344SAndy King /* Remove stream sockets from the unbound list and add them to the hash 519d021c344SAndy King * table for easy lookup by its address. The unbound list is simply an 520d021c344SAndy King * extra entry at the end of the hash table, a trick used by AF_UNIX. 521d021c344SAndy King */ 522d021c344SAndy King __vsock_remove_bound(vsk); 523d021c344SAndy King __vsock_insert_bound(vsock_bound_sockets(&vsk->local_addr), vsk); 524d021c344SAndy King 525d021c344SAndy King return 0; 526d021c344SAndy King } 527d021c344SAndy King 528d021c344SAndy King static int __vsock_bind_dgram(struct vsock_sock *vsk, 529d021c344SAndy King struct sockaddr_vm *addr) 530d021c344SAndy King { 531d021c344SAndy King return transport->dgram_bind(vsk, addr); 532d021c344SAndy King } 533d021c344SAndy King 534d021c344SAndy King static int __vsock_bind(struct sock *sk, struct sockaddr_vm *addr) 535d021c344SAndy King { 536d021c344SAndy King struct vsock_sock *vsk = vsock_sk(sk); 537d021c344SAndy King u32 cid; 538d021c344SAndy King int retval; 539d021c344SAndy King 540d021c344SAndy King /* First ensure this socket isn't already bound. */ 541d021c344SAndy King if (vsock_addr_bound(&vsk->local_addr)) 542d021c344SAndy King return -EINVAL; 543d021c344SAndy King 544d021c344SAndy King /* Now bind to the provided address or select appropriate values if 545d021c344SAndy King * none are provided (VMADDR_CID_ANY and VMADDR_PORT_ANY). Note that 546d021c344SAndy King * like AF_INET prevents binding to a non-local IP address (in most 547d021c344SAndy King * cases), we only allow binding to the local CID. 548d021c344SAndy King */ 549d021c344SAndy King cid = transport->get_local_cid(); 550d021c344SAndy King if (addr->svm_cid != cid && addr->svm_cid != VMADDR_CID_ANY) 551d021c344SAndy King return -EADDRNOTAVAIL; 552d021c344SAndy King 553d021c344SAndy King switch (sk->sk_socket->type) { 554d021c344SAndy King case SOCK_STREAM: 555d021c344SAndy King spin_lock_bh(&vsock_table_lock); 556d021c344SAndy King retval = __vsock_bind_stream(vsk, addr); 557d021c344SAndy King spin_unlock_bh(&vsock_table_lock); 558d021c344SAndy King break; 559d021c344SAndy King 560d021c344SAndy King case SOCK_DGRAM: 561d021c344SAndy King retval = __vsock_bind_dgram(vsk, addr); 562d021c344SAndy King break; 563d021c344SAndy King 564d021c344SAndy King default: 565d021c344SAndy King retval = -EINVAL; 566d021c344SAndy King break; 567d021c344SAndy King } 568d021c344SAndy King 569d021c344SAndy King return retval; 570d021c344SAndy King } 571d021c344SAndy King 572455f05ecSCong Wang static void vsock_connect_timeout(struct work_struct *work); 573455f05ecSCong Wang 574d021c344SAndy King struct sock *__vsock_create(struct net *net, 575d021c344SAndy King struct socket *sock, 576d021c344SAndy King struct sock *parent, 577d021c344SAndy King gfp_t priority, 57811aa9c28SEric W. Biederman unsigned short type, 57911aa9c28SEric W. Biederman int kern) 580d021c344SAndy King { 581d021c344SAndy King struct sock *sk; 582d021c344SAndy King struct vsock_sock *psk; 583d021c344SAndy King struct vsock_sock *vsk; 584d021c344SAndy King 58511aa9c28SEric W. Biederman sk = sk_alloc(net, AF_VSOCK, priority, &vsock_proto, kern); 586d021c344SAndy King if (!sk) 587d021c344SAndy King return NULL; 588d021c344SAndy King 589d021c344SAndy King sock_init_data(sock, sk); 590d021c344SAndy King 591d021c344SAndy King /* sk->sk_type is normally set in sock_init_data, but only if sock is 592d021c344SAndy King * non-NULL. We make sure that our sockets always have a type by 593d021c344SAndy King * setting it here if needed. 594d021c344SAndy King */ 595d021c344SAndy King if (!sock) 596d021c344SAndy King sk->sk_type = type; 597d021c344SAndy King 598d021c344SAndy King vsk = vsock_sk(sk); 599d021c344SAndy King vsock_addr_init(&vsk->local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); 600d021c344SAndy King vsock_addr_init(&vsk->remote_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); 601d021c344SAndy King 602d021c344SAndy King sk->sk_destruct = vsock_sk_destruct; 603d021c344SAndy King sk->sk_backlog_rcv = vsock_queue_rcv_skb; 604d021c344SAndy King sock_reset_flag(sk, SOCK_DONE); 605d021c344SAndy King 606d021c344SAndy King INIT_LIST_HEAD(&vsk->bound_table); 607d021c344SAndy King INIT_LIST_HEAD(&vsk->connected_table); 608d021c344SAndy King vsk->listener = NULL; 609d021c344SAndy King INIT_LIST_HEAD(&vsk->pending_links); 610d021c344SAndy King INIT_LIST_HEAD(&vsk->accept_queue); 611d021c344SAndy King vsk->rejected = false; 612d021c344SAndy King vsk->sent_request = false; 613d021c344SAndy King vsk->ignore_connecting_rst = false; 614d021c344SAndy King vsk->peer_shutdown = 0; 615455f05ecSCong Wang INIT_DELAYED_WORK(&vsk->connect_work, vsock_connect_timeout); 616455f05ecSCong Wang INIT_DELAYED_WORK(&vsk->pending_work, vsock_pending_work); 617d021c344SAndy King 618d021c344SAndy King psk = parent ? vsock_sk(parent) : NULL; 619d021c344SAndy King if (parent) { 620d021c344SAndy King vsk->trusted = psk->trusted; 621d021c344SAndy King vsk->owner = get_cred(psk->owner); 622d021c344SAndy King vsk->connect_timeout = psk->connect_timeout; 623d021c344SAndy King } else { 624d021c344SAndy King vsk->trusted = capable(CAP_NET_ADMIN); 625d021c344SAndy King vsk->owner = get_current_cred(); 626d021c344SAndy King vsk->connect_timeout = VSOCK_DEFAULT_CONNECT_TIMEOUT; 627d021c344SAndy King } 628d021c344SAndy King 629d021c344SAndy King if (transport->init(vsk, psk) < 0) { 630d021c344SAndy King sk_free(sk); 631d021c344SAndy King return NULL; 632d021c344SAndy King } 633d021c344SAndy King 634d021c344SAndy King if (sock) 635d021c344SAndy King vsock_insert_unbound(vsk); 636d021c344SAndy King 637d021c344SAndy King return sk; 638d021c344SAndy King } 639d021c344SAndy King EXPORT_SYMBOL_GPL(__vsock_create); 640d021c344SAndy King 6410d9138ffSDexuan Cui static void __vsock_release(struct sock *sk, int level) 642d021c344SAndy King { 643d021c344SAndy King if (sk) { 644d021c344SAndy King struct sock *pending; 645d021c344SAndy King struct vsock_sock *vsk; 646d021c344SAndy King 647d021c344SAndy King vsk = vsock_sk(sk); 648d021c344SAndy King pending = NULL; /* Compiler warning. */ 649d021c344SAndy King 6500d9138ffSDexuan Cui /* The release call is supposed to use lock_sock_nested() 6510d9138ffSDexuan Cui * rather than lock_sock(), if a sock lock should be acquired. 6520d9138ffSDexuan Cui */ 653d021c344SAndy King transport->release(vsk); 654d021c344SAndy King 6550d9138ffSDexuan Cui /* When "level" is SINGLE_DEPTH_NESTING, use the nested 6560d9138ffSDexuan Cui * version to avoid the warning "possible recursive locking 6570d9138ffSDexuan Cui * detected". When "level" is 0, lock_sock_nested(sk, level) 6580d9138ffSDexuan Cui * is the same as lock_sock(sk). 6590d9138ffSDexuan Cui */ 6600d9138ffSDexuan Cui lock_sock_nested(sk, level); 661d021c344SAndy King sock_orphan(sk); 662d021c344SAndy King sk->sk_shutdown = SHUTDOWN_MASK; 663d021c344SAndy King 6643b7ad08bSChristophe JAILLET skb_queue_purge(&sk->sk_receive_queue); 665d021c344SAndy King 666d021c344SAndy King /* Clean up any sockets that never were accepted. */ 667d021c344SAndy King while ((pending = vsock_dequeue_accept(sk)) != NULL) { 6680d9138ffSDexuan Cui __vsock_release(pending, SINGLE_DEPTH_NESTING); 669d021c344SAndy King sock_put(pending); 670d021c344SAndy King } 671d021c344SAndy King 672d021c344SAndy King release_sock(sk); 673d021c344SAndy King sock_put(sk); 674d021c344SAndy King } 675d021c344SAndy King } 676d021c344SAndy King 677d021c344SAndy King static void vsock_sk_destruct(struct sock *sk) 678d021c344SAndy King { 679d021c344SAndy King struct vsock_sock *vsk = vsock_sk(sk); 680d021c344SAndy King 681d021c344SAndy King transport->destruct(vsk); 682d021c344SAndy King 683d021c344SAndy King /* When clearing these addresses, there's no need to set the family and 684d021c344SAndy King * possibly register the address family with the kernel. 685d021c344SAndy King */ 686d021c344SAndy King vsock_addr_init(&vsk->local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); 687d021c344SAndy King vsock_addr_init(&vsk->remote_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); 688d021c344SAndy King 689d021c344SAndy King put_cred(vsk->owner); 690d021c344SAndy King } 691d021c344SAndy King 692d021c344SAndy King static int vsock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 693d021c344SAndy King { 694d021c344SAndy King int err; 695d021c344SAndy King 696d021c344SAndy King err = sock_queue_rcv_skb(sk, skb); 697d021c344SAndy King if (err) 698d021c344SAndy King kfree_skb(skb); 699d021c344SAndy King 700d021c344SAndy King return err; 701d021c344SAndy King } 702d021c344SAndy King 703d021c344SAndy King s64 vsock_stream_has_data(struct vsock_sock *vsk) 704d021c344SAndy King { 705d021c344SAndy King return transport->stream_has_data(vsk); 706d021c344SAndy King } 707d021c344SAndy King EXPORT_SYMBOL_GPL(vsock_stream_has_data); 708d021c344SAndy King 709d021c344SAndy King s64 vsock_stream_has_space(struct vsock_sock *vsk) 710d021c344SAndy King { 711d021c344SAndy King return transport->stream_has_space(vsk); 712d021c344SAndy King } 713d021c344SAndy King EXPORT_SYMBOL_GPL(vsock_stream_has_space); 714d021c344SAndy King 715d021c344SAndy King static int vsock_release(struct socket *sock) 716d021c344SAndy King { 7170d9138ffSDexuan Cui __vsock_release(sock->sk, 0); 718d021c344SAndy King sock->sk = NULL; 719d021c344SAndy King sock->state = SS_FREE; 720d021c344SAndy King 721d021c344SAndy King return 0; 722d021c344SAndy King } 723d021c344SAndy King 724d021c344SAndy King static int 725d021c344SAndy King vsock_bind(struct socket *sock, struct sockaddr *addr, int addr_len) 726d021c344SAndy King { 727d021c344SAndy King int err; 728d021c344SAndy King struct sock *sk; 729d021c344SAndy King struct sockaddr_vm *vm_addr; 730d021c344SAndy King 731d021c344SAndy King sk = sock->sk; 732d021c344SAndy King 733d021c344SAndy King if (vsock_addr_cast(addr, addr_len, &vm_addr) != 0) 734d021c344SAndy King return -EINVAL; 735d021c344SAndy King 736d021c344SAndy King lock_sock(sk); 737d021c344SAndy King err = __vsock_bind(sk, vm_addr); 738d021c344SAndy King release_sock(sk); 739d021c344SAndy King 740d021c344SAndy King return err; 741d021c344SAndy King } 742d021c344SAndy King 743d021c344SAndy King static int vsock_getname(struct socket *sock, 7449b2c45d4SDenys Vlasenko struct sockaddr *addr, int peer) 745d021c344SAndy King { 746d021c344SAndy King int err; 747d021c344SAndy King struct sock *sk; 748d021c344SAndy King struct vsock_sock *vsk; 749d021c344SAndy King struct sockaddr_vm *vm_addr; 750d021c344SAndy King 751d021c344SAndy King sk = sock->sk; 752d021c344SAndy King vsk = vsock_sk(sk); 753d021c344SAndy King err = 0; 754d021c344SAndy King 755d021c344SAndy King lock_sock(sk); 756d021c344SAndy King 757d021c344SAndy King if (peer) { 758d021c344SAndy King if (sock->state != SS_CONNECTED) { 759d021c344SAndy King err = -ENOTCONN; 760d021c344SAndy King goto out; 761d021c344SAndy King } 762d021c344SAndy King vm_addr = &vsk->remote_addr; 763d021c344SAndy King } else { 764d021c344SAndy King vm_addr = &vsk->local_addr; 765d021c344SAndy King } 766d021c344SAndy King 767d021c344SAndy King if (!vm_addr) { 768d021c344SAndy King err = -EINVAL; 769d021c344SAndy King goto out; 770d021c344SAndy King } 771d021c344SAndy King 772d021c344SAndy King /* sys_getsockname() and sys_getpeername() pass us a 773d021c344SAndy King * MAX_SOCK_ADDR-sized buffer and don't set addr_len. Unfortunately 774d021c344SAndy King * that macro is defined in socket.c instead of .h, so we hardcode its 775d021c344SAndy King * value here. 776d021c344SAndy King */ 777d021c344SAndy King BUILD_BUG_ON(sizeof(*vm_addr) > 128); 778d021c344SAndy King memcpy(addr, vm_addr, sizeof(*vm_addr)); 7799b2c45d4SDenys Vlasenko err = sizeof(*vm_addr); 780d021c344SAndy King 781d021c344SAndy King out: 782d021c344SAndy King release_sock(sk); 783d021c344SAndy King return err; 784d021c344SAndy King } 785d021c344SAndy King 786d021c344SAndy King static int vsock_shutdown(struct socket *sock, int mode) 787d021c344SAndy King { 788d021c344SAndy King int err; 789d021c344SAndy King struct sock *sk; 790d021c344SAndy King 791d021c344SAndy King /* User level uses SHUT_RD (0) and SHUT_WR (1), but the kernel uses 792d021c344SAndy King * RCV_SHUTDOWN (1) and SEND_SHUTDOWN (2), so we must increment mode 793d021c344SAndy King * here like the other address families do. Note also that the 794d021c344SAndy King * increment makes SHUT_RDWR (2) into RCV_SHUTDOWN | SEND_SHUTDOWN (3), 795d021c344SAndy King * which is what we want. 796d021c344SAndy King */ 797d021c344SAndy King mode++; 798d021c344SAndy King 799d021c344SAndy King if ((mode & ~SHUTDOWN_MASK) || !mode) 800d021c344SAndy King return -EINVAL; 801d021c344SAndy King 802d021c344SAndy King /* If this is a STREAM socket and it is not connected then bail out 803d021c344SAndy King * immediately. If it is a DGRAM socket then we must first kick the 804d021c344SAndy King * socket so that it wakes up from any sleeping calls, for example 805d021c344SAndy King * recv(), and then afterwards return the error. 806d021c344SAndy King */ 807d021c344SAndy King 808d021c344SAndy King sk = sock->sk; 809d021c344SAndy King if (sock->state == SS_UNCONNECTED) { 810d021c344SAndy King err = -ENOTCONN; 811d021c344SAndy King if (sk->sk_type == SOCK_STREAM) 812d021c344SAndy King return err; 813d021c344SAndy King } else { 814d021c344SAndy King sock->state = SS_DISCONNECTING; 815d021c344SAndy King err = 0; 816d021c344SAndy King } 817d021c344SAndy King 818d021c344SAndy King /* Receive and send shutdowns are treated alike. */ 819d021c344SAndy King mode = mode & (RCV_SHUTDOWN | SEND_SHUTDOWN); 820d021c344SAndy King if (mode) { 821d021c344SAndy King lock_sock(sk); 822d021c344SAndy King sk->sk_shutdown |= mode; 823d021c344SAndy King sk->sk_state_change(sk); 824d021c344SAndy King release_sock(sk); 825d021c344SAndy King 826d021c344SAndy King if (sk->sk_type == SOCK_STREAM) { 827d021c344SAndy King sock_reset_flag(sk, SOCK_DONE); 828d021c344SAndy King vsock_send_shutdown(sk, mode); 829d021c344SAndy King } 830d021c344SAndy King } 831d021c344SAndy King 832d021c344SAndy King return err; 833d021c344SAndy King } 834d021c344SAndy King 835a11e1d43SLinus Torvalds static __poll_t vsock_poll(struct file *file, struct socket *sock, 836a11e1d43SLinus Torvalds poll_table *wait) 837d021c344SAndy King { 838a11e1d43SLinus Torvalds struct sock *sk; 839a11e1d43SLinus Torvalds __poll_t mask; 840a11e1d43SLinus Torvalds struct vsock_sock *vsk; 841a11e1d43SLinus Torvalds 842a11e1d43SLinus Torvalds sk = sock->sk; 843a11e1d43SLinus Torvalds vsk = vsock_sk(sk); 844a11e1d43SLinus Torvalds 845a11e1d43SLinus Torvalds poll_wait(file, sk_sleep(sk), wait); 846a11e1d43SLinus Torvalds mask = 0; 847d021c344SAndy King 848d021c344SAndy King if (sk->sk_err) 849d021c344SAndy King /* Signify that there has been an error on this socket. */ 850a9a08845SLinus Torvalds mask |= EPOLLERR; 851d021c344SAndy King 852d021c344SAndy King /* INET sockets treat local write shutdown and peer write shutdown as a 853a9a08845SLinus Torvalds * case of EPOLLHUP set. 854d021c344SAndy King */ 855d021c344SAndy King if ((sk->sk_shutdown == SHUTDOWN_MASK) || 856d021c344SAndy King ((sk->sk_shutdown & SEND_SHUTDOWN) && 857d021c344SAndy King (vsk->peer_shutdown & SEND_SHUTDOWN))) { 858a9a08845SLinus Torvalds mask |= EPOLLHUP; 859d021c344SAndy King } 860d021c344SAndy King 861d021c344SAndy King if (sk->sk_shutdown & RCV_SHUTDOWN || 862d021c344SAndy King vsk->peer_shutdown & SEND_SHUTDOWN) { 863a9a08845SLinus Torvalds mask |= EPOLLRDHUP; 864d021c344SAndy King } 865d021c344SAndy King 866d021c344SAndy King if (sock->type == SOCK_DGRAM) { 867d021c344SAndy King /* For datagram sockets we can read if there is something in 868d021c344SAndy King * the queue and write as long as the socket isn't shutdown for 869d021c344SAndy King * sending. 870d021c344SAndy King */ 8713ef7cf57SEric Dumazet if (!skb_queue_empty_lockless(&sk->sk_receive_queue) || 872d021c344SAndy King (sk->sk_shutdown & RCV_SHUTDOWN)) { 873a9a08845SLinus Torvalds mask |= EPOLLIN | EPOLLRDNORM; 874d021c344SAndy King } 875d021c344SAndy King 876d021c344SAndy King if (!(sk->sk_shutdown & SEND_SHUTDOWN)) 877a9a08845SLinus Torvalds mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND; 878d021c344SAndy King 879d021c344SAndy King } else if (sock->type == SOCK_STREAM) { 880d021c344SAndy King lock_sock(sk); 881d021c344SAndy King 882d021c344SAndy King /* Listening sockets that have connections in their accept 883d021c344SAndy King * queue can be read. 884d021c344SAndy King */ 8853b4477d2SStefan Hajnoczi if (sk->sk_state == TCP_LISTEN 886d021c344SAndy King && !vsock_is_accept_queue_empty(sk)) 887a9a08845SLinus Torvalds mask |= EPOLLIN | EPOLLRDNORM; 888d021c344SAndy King 889d021c344SAndy King /* If there is something in the queue then we can read. */ 890d021c344SAndy King if (transport->stream_is_active(vsk) && 891d021c344SAndy King !(sk->sk_shutdown & RCV_SHUTDOWN)) { 892d021c344SAndy King bool data_ready_now = false; 893d021c344SAndy King int ret = transport->notify_poll_in( 894d021c344SAndy King vsk, 1, &data_ready_now); 895d021c344SAndy King if (ret < 0) { 896a9a08845SLinus Torvalds mask |= EPOLLERR; 897d021c344SAndy King } else { 898d021c344SAndy King if (data_ready_now) 899a9a08845SLinus Torvalds mask |= EPOLLIN | EPOLLRDNORM; 900d021c344SAndy King 901d021c344SAndy King } 902d021c344SAndy King } 903d021c344SAndy King 904d021c344SAndy King /* Sockets whose connections have been closed, reset, or 905d021c344SAndy King * terminated should also be considered read, and we check the 906d021c344SAndy King * shutdown flag for that. 907d021c344SAndy King */ 908d021c344SAndy King if (sk->sk_shutdown & RCV_SHUTDOWN || 909d021c344SAndy King vsk->peer_shutdown & SEND_SHUTDOWN) { 910a9a08845SLinus Torvalds mask |= EPOLLIN | EPOLLRDNORM; 911d021c344SAndy King } 912d021c344SAndy King 913d021c344SAndy King /* Connected sockets that can produce data can be written. */ 9143b4477d2SStefan Hajnoczi if (sk->sk_state == TCP_ESTABLISHED) { 915d021c344SAndy King if (!(sk->sk_shutdown & SEND_SHUTDOWN)) { 916d021c344SAndy King bool space_avail_now = false; 917d021c344SAndy King int ret = transport->notify_poll_out( 918d021c344SAndy King vsk, 1, &space_avail_now); 919d021c344SAndy King if (ret < 0) { 920a9a08845SLinus Torvalds mask |= EPOLLERR; 921d021c344SAndy King } else { 922d021c344SAndy King if (space_avail_now) 923a9a08845SLinus Torvalds /* Remove EPOLLWRBAND since INET 924d021c344SAndy King * sockets are not setting it. 925d021c344SAndy King */ 926a9a08845SLinus Torvalds mask |= EPOLLOUT | EPOLLWRNORM; 927d021c344SAndy King 928d021c344SAndy King } 929d021c344SAndy King } 930d021c344SAndy King } 931d021c344SAndy King 932d021c344SAndy King /* Simulate INET socket poll behaviors, which sets 933a9a08845SLinus Torvalds * EPOLLOUT|EPOLLWRNORM when peer is closed and nothing to read, 934d021c344SAndy King * but local send is not shutdown. 935d021c344SAndy King */ 936ba3169fcSStefan Hajnoczi if (sk->sk_state == TCP_CLOSE || sk->sk_state == TCP_CLOSING) { 937d021c344SAndy King if (!(sk->sk_shutdown & SEND_SHUTDOWN)) 938a9a08845SLinus Torvalds mask |= EPOLLOUT | EPOLLWRNORM; 939d021c344SAndy King 940d021c344SAndy King } 941d021c344SAndy King 942d021c344SAndy King release_sock(sk); 943d021c344SAndy King } 944d021c344SAndy King 945d021c344SAndy King return mask; 946d021c344SAndy King } 947d021c344SAndy King 9481b784140SYing Xue static int vsock_dgram_sendmsg(struct socket *sock, struct msghdr *msg, 9491b784140SYing Xue size_t len) 950d021c344SAndy King { 951d021c344SAndy King int err; 952d021c344SAndy King struct sock *sk; 953d021c344SAndy King struct vsock_sock *vsk; 954d021c344SAndy King struct sockaddr_vm *remote_addr; 955d021c344SAndy King 956d021c344SAndy King if (msg->msg_flags & MSG_OOB) 957d021c344SAndy King return -EOPNOTSUPP; 958d021c344SAndy King 959d021c344SAndy King /* For now, MSG_DONTWAIT is always assumed... */ 960d021c344SAndy King err = 0; 961d021c344SAndy King sk = sock->sk; 962d021c344SAndy King vsk = vsock_sk(sk); 963d021c344SAndy King 964d021c344SAndy King lock_sock(sk); 965d021c344SAndy King 966b3a6dfe8SAsias He err = vsock_auto_bind(vsk); 967b3a6dfe8SAsias He if (err) 968d021c344SAndy King goto out; 969d021c344SAndy King 970d021c344SAndy King 971d021c344SAndy King /* If the provided message contains an address, use that. Otherwise 972d021c344SAndy King * fall back on the socket's remote handle (if it has been connected). 973d021c344SAndy King */ 974d021c344SAndy King if (msg->msg_name && 975d021c344SAndy King vsock_addr_cast(msg->msg_name, msg->msg_namelen, 976d021c344SAndy King &remote_addr) == 0) { 977d021c344SAndy King /* Ensure this address is of the right type and is a valid 978d021c344SAndy King * destination. 979d021c344SAndy King */ 980d021c344SAndy King 981d021c344SAndy King if (remote_addr->svm_cid == VMADDR_CID_ANY) 982d021c344SAndy King remote_addr->svm_cid = transport->get_local_cid(); 983d021c344SAndy King 984d021c344SAndy King if (!vsock_addr_bound(remote_addr)) { 985d021c344SAndy King err = -EINVAL; 986d021c344SAndy King goto out; 987d021c344SAndy King } 988d021c344SAndy King } else if (sock->state == SS_CONNECTED) { 989d021c344SAndy King remote_addr = &vsk->remote_addr; 990d021c344SAndy King 991d021c344SAndy King if (remote_addr->svm_cid == VMADDR_CID_ANY) 992d021c344SAndy King remote_addr->svm_cid = transport->get_local_cid(); 993d021c344SAndy King 994d021c344SAndy King /* XXX Should connect() or this function ensure remote_addr is 995d021c344SAndy King * bound? 996d021c344SAndy King */ 997d021c344SAndy King if (!vsock_addr_bound(&vsk->remote_addr)) { 998d021c344SAndy King err = -EINVAL; 999d021c344SAndy King goto out; 1000d021c344SAndy King } 1001d021c344SAndy King } else { 1002d021c344SAndy King err = -EINVAL; 1003d021c344SAndy King goto out; 1004d021c344SAndy King } 1005d021c344SAndy King 1006d021c344SAndy King if (!transport->dgram_allow(remote_addr->svm_cid, 1007d021c344SAndy King remote_addr->svm_port)) { 1008d021c344SAndy King err = -EINVAL; 1009d021c344SAndy King goto out; 1010d021c344SAndy King } 1011d021c344SAndy King 10120f7db23aSAl Viro err = transport->dgram_enqueue(vsk, remote_addr, msg, len); 1013d021c344SAndy King 1014d021c344SAndy King out: 1015d021c344SAndy King release_sock(sk); 1016d021c344SAndy King return err; 1017d021c344SAndy King } 1018d021c344SAndy King 1019d021c344SAndy King static int vsock_dgram_connect(struct socket *sock, 1020d021c344SAndy King struct sockaddr *addr, int addr_len, int flags) 1021d021c344SAndy King { 1022d021c344SAndy King int err; 1023d021c344SAndy King struct sock *sk; 1024d021c344SAndy King struct vsock_sock *vsk; 1025d021c344SAndy King struct sockaddr_vm *remote_addr; 1026d021c344SAndy King 1027d021c344SAndy King sk = sock->sk; 1028d021c344SAndy King vsk = vsock_sk(sk); 1029d021c344SAndy King 1030d021c344SAndy King err = vsock_addr_cast(addr, addr_len, &remote_addr); 1031d021c344SAndy King if (err == -EAFNOSUPPORT && remote_addr->svm_family == AF_UNSPEC) { 1032d021c344SAndy King lock_sock(sk); 1033d021c344SAndy King vsock_addr_init(&vsk->remote_addr, VMADDR_CID_ANY, 1034d021c344SAndy King VMADDR_PORT_ANY); 1035d021c344SAndy King sock->state = SS_UNCONNECTED; 1036d021c344SAndy King release_sock(sk); 1037d021c344SAndy King return 0; 1038d021c344SAndy King } else if (err != 0) 1039d021c344SAndy King return -EINVAL; 1040d021c344SAndy King 1041d021c344SAndy King lock_sock(sk); 1042d021c344SAndy King 1043b3a6dfe8SAsias He err = vsock_auto_bind(vsk); 1044b3a6dfe8SAsias He if (err) 1045d021c344SAndy King goto out; 1046d021c344SAndy King 1047d021c344SAndy King if (!transport->dgram_allow(remote_addr->svm_cid, 1048d021c344SAndy King remote_addr->svm_port)) { 1049d021c344SAndy King err = -EINVAL; 1050d021c344SAndy King goto out; 1051d021c344SAndy King } 1052d021c344SAndy King 1053d021c344SAndy King memcpy(&vsk->remote_addr, remote_addr, sizeof(vsk->remote_addr)); 1054d021c344SAndy King sock->state = SS_CONNECTED; 1055d021c344SAndy King 1056d021c344SAndy King out: 1057d021c344SAndy King release_sock(sk); 1058d021c344SAndy King return err; 1059d021c344SAndy King } 1060d021c344SAndy King 10611b784140SYing Xue static int vsock_dgram_recvmsg(struct socket *sock, struct msghdr *msg, 10621b784140SYing Xue size_t len, int flags) 1063d021c344SAndy King { 10641b784140SYing Xue return transport->dgram_dequeue(vsock_sk(sock->sk), msg, len, flags); 1065d021c344SAndy King } 1066d021c344SAndy King 1067d021c344SAndy King static const struct proto_ops vsock_dgram_ops = { 1068d021c344SAndy King .family = PF_VSOCK, 1069d021c344SAndy King .owner = THIS_MODULE, 1070d021c344SAndy King .release = vsock_release, 1071d021c344SAndy King .bind = vsock_bind, 1072d021c344SAndy King .connect = vsock_dgram_connect, 1073d021c344SAndy King .socketpair = sock_no_socketpair, 1074d021c344SAndy King .accept = sock_no_accept, 1075d021c344SAndy King .getname = vsock_getname, 1076a11e1d43SLinus Torvalds .poll = vsock_poll, 1077d021c344SAndy King .ioctl = sock_no_ioctl, 1078d021c344SAndy King .listen = sock_no_listen, 1079d021c344SAndy King .shutdown = vsock_shutdown, 1080d021c344SAndy King .setsockopt = sock_no_setsockopt, 1081d021c344SAndy King .getsockopt = sock_no_getsockopt, 1082d021c344SAndy King .sendmsg = vsock_dgram_sendmsg, 1083d021c344SAndy King .recvmsg = vsock_dgram_recvmsg, 1084d021c344SAndy King .mmap = sock_no_mmap, 1085d021c344SAndy King .sendpage = sock_no_sendpage, 1086d021c344SAndy King }; 1087d021c344SAndy King 1088380feae0SPeng Tao static int vsock_transport_cancel_pkt(struct vsock_sock *vsk) 1089380feae0SPeng Tao { 1090380feae0SPeng Tao if (!transport->cancel_pkt) 1091380feae0SPeng Tao return -EOPNOTSUPP; 1092380feae0SPeng Tao 1093380feae0SPeng Tao return transport->cancel_pkt(vsk); 1094380feae0SPeng Tao } 1095380feae0SPeng Tao 1096d021c344SAndy King static void vsock_connect_timeout(struct work_struct *work) 1097d021c344SAndy King { 1098d021c344SAndy King struct sock *sk; 1099d021c344SAndy King struct vsock_sock *vsk; 1100380feae0SPeng Tao int cancel = 0; 1101d021c344SAndy King 1102455f05ecSCong Wang vsk = container_of(work, struct vsock_sock, connect_work.work); 1103d021c344SAndy King sk = sk_vsock(vsk); 1104d021c344SAndy King 1105d021c344SAndy King lock_sock(sk); 11063b4477d2SStefan Hajnoczi if (sk->sk_state == TCP_SYN_SENT && 1107d021c344SAndy King (sk->sk_shutdown != SHUTDOWN_MASK)) { 11083b4477d2SStefan Hajnoczi sk->sk_state = TCP_CLOSE; 1109d021c344SAndy King sk->sk_err = ETIMEDOUT; 1110d021c344SAndy King sk->sk_error_report(sk); 1111380feae0SPeng Tao cancel = 1; 1112d021c344SAndy King } 1113d021c344SAndy King release_sock(sk); 1114380feae0SPeng Tao if (cancel) 1115380feae0SPeng Tao vsock_transport_cancel_pkt(vsk); 1116d021c344SAndy King 1117d021c344SAndy King sock_put(sk); 1118d021c344SAndy King } 1119d021c344SAndy King 1120d021c344SAndy King static int vsock_stream_connect(struct socket *sock, struct sockaddr *addr, 1121d021c344SAndy King int addr_len, int flags) 1122d021c344SAndy King { 1123d021c344SAndy King int err; 1124d021c344SAndy King struct sock *sk; 1125d021c344SAndy King struct vsock_sock *vsk; 1126d021c344SAndy King struct sockaddr_vm *remote_addr; 1127d021c344SAndy King long timeout; 1128d021c344SAndy King DEFINE_WAIT(wait); 1129d021c344SAndy King 1130d021c344SAndy King err = 0; 1131d021c344SAndy King sk = sock->sk; 1132d021c344SAndy King vsk = vsock_sk(sk); 1133d021c344SAndy King 1134d021c344SAndy King lock_sock(sk); 1135d021c344SAndy King 1136d021c344SAndy King /* XXX AF_UNSPEC should make us disconnect like AF_INET. */ 1137d021c344SAndy King switch (sock->state) { 1138d021c344SAndy King case SS_CONNECTED: 1139d021c344SAndy King err = -EISCONN; 1140d021c344SAndy King goto out; 1141d021c344SAndy King case SS_DISCONNECTING: 1142d021c344SAndy King err = -EINVAL; 1143d021c344SAndy King goto out; 1144d021c344SAndy King case SS_CONNECTING: 1145d021c344SAndy King /* This continues on so we can move sock into the SS_CONNECTED 1146d021c344SAndy King * state once the connection has completed (at which point err 1147d021c344SAndy King * will be set to zero also). Otherwise, we will either wait 1148d021c344SAndy King * for the connection or return -EALREADY should this be a 1149d021c344SAndy King * non-blocking call. 1150d021c344SAndy King */ 1151d021c344SAndy King err = -EALREADY; 1152d021c344SAndy King break; 1153d021c344SAndy King default: 11543b4477d2SStefan Hajnoczi if ((sk->sk_state == TCP_LISTEN) || 1155d021c344SAndy King vsock_addr_cast(addr, addr_len, &remote_addr) != 0) { 1156d021c344SAndy King err = -EINVAL; 1157d021c344SAndy King goto out; 1158d021c344SAndy King } 1159d021c344SAndy King 1160d021c344SAndy King /* The hypervisor and well-known contexts do not have socket 1161d021c344SAndy King * endpoints. 1162d021c344SAndy King */ 1163d021c344SAndy King if (!transport->stream_allow(remote_addr->svm_cid, 1164d021c344SAndy King remote_addr->svm_port)) { 1165d021c344SAndy King err = -ENETUNREACH; 1166d021c344SAndy King goto out; 1167d021c344SAndy King } 1168d021c344SAndy King 1169d021c344SAndy King /* Set the remote address that we are connecting to. */ 1170d021c344SAndy King memcpy(&vsk->remote_addr, remote_addr, 1171d021c344SAndy King sizeof(vsk->remote_addr)); 1172d021c344SAndy King 1173b3a6dfe8SAsias He err = vsock_auto_bind(vsk); 1174b3a6dfe8SAsias He if (err) 1175d021c344SAndy King goto out; 1176d021c344SAndy King 11773b4477d2SStefan Hajnoczi sk->sk_state = TCP_SYN_SENT; 1178d021c344SAndy King 1179d021c344SAndy King err = transport->connect(vsk); 1180d021c344SAndy King if (err < 0) 1181d021c344SAndy King goto out; 1182d021c344SAndy King 1183d021c344SAndy King /* Mark sock as connecting and set the error code to in 1184d021c344SAndy King * progress in case this is a non-blocking connect. 1185d021c344SAndy King */ 1186d021c344SAndy King sock->state = SS_CONNECTING; 1187d021c344SAndy King err = -EINPROGRESS; 1188d021c344SAndy King } 1189d021c344SAndy King 1190d021c344SAndy King /* The receive path will handle all communication until we are able to 1191d021c344SAndy King * enter the connected state. Here we wait for the connection to be 1192d021c344SAndy King * completed or a notification of an error. 1193d021c344SAndy King */ 1194d021c344SAndy King timeout = vsk->connect_timeout; 1195d021c344SAndy King prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 1196d021c344SAndy King 11973b4477d2SStefan Hajnoczi while (sk->sk_state != TCP_ESTABLISHED && sk->sk_err == 0) { 1198d021c344SAndy King if (flags & O_NONBLOCK) { 1199d021c344SAndy King /* If we're not going to block, we schedule a timeout 1200d021c344SAndy King * function to generate a timeout on the connection 1201d021c344SAndy King * attempt, in case the peer doesn't respond in a 1202d021c344SAndy King * timely manner. We hold on to the socket until the 1203d021c344SAndy King * timeout fires. 1204d021c344SAndy King */ 1205d021c344SAndy King sock_hold(sk); 1206455f05ecSCong Wang schedule_delayed_work(&vsk->connect_work, timeout); 1207d021c344SAndy King 1208d021c344SAndy King /* Skip ahead to preserve error code set above. */ 1209d021c344SAndy King goto out_wait; 1210d021c344SAndy King } 1211d021c344SAndy King 1212d021c344SAndy King release_sock(sk); 1213d021c344SAndy King timeout = schedule_timeout(timeout); 1214d021c344SAndy King lock_sock(sk); 1215d021c344SAndy King 1216d021c344SAndy King if (signal_pending(current)) { 1217d021c344SAndy King err = sock_intr_errno(timeout); 12183b4477d2SStefan Hajnoczi sk->sk_state = TCP_CLOSE; 1219f7f9b5e7SClaudio Imbrenda sock->state = SS_UNCONNECTED; 1220380feae0SPeng Tao vsock_transport_cancel_pkt(vsk); 1221f7f9b5e7SClaudio Imbrenda goto out_wait; 1222d021c344SAndy King } else if (timeout == 0) { 1223d021c344SAndy King err = -ETIMEDOUT; 12243b4477d2SStefan Hajnoczi sk->sk_state = TCP_CLOSE; 1225f7f9b5e7SClaudio Imbrenda sock->state = SS_UNCONNECTED; 1226380feae0SPeng Tao vsock_transport_cancel_pkt(vsk); 1227f7f9b5e7SClaudio Imbrenda goto out_wait; 1228d021c344SAndy King } 1229d021c344SAndy King 1230d021c344SAndy King prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 1231d021c344SAndy King } 1232d021c344SAndy King 1233d021c344SAndy King if (sk->sk_err) { 1234d021c344SAndy King err = -sk->sk_err; 12353b4477d2SStefan Hajnoczi sk->sk_state = TCP_CLOSE; 1236f7f9b5e7SClaudio Imbrenda sock->state = SS_UNCONNECTED; 1237f7f9b5e7SClaudio Imbrenda } else { 1238d021c344SAndy King err = 0; 1239f7f9b5e7SClaudio Imbrenda } 1240d021c344SAndy King 1241d021c344SAndy King out_wait: 1242d021c344SAndy King finish_wait(sk_sleep(sk), &wait); 1243d021c344SAndy King out: 1244d021c344SAndy King release_sock(sk); 1245d021c344SAndy King return err; 1246d021c344SAndy King } 1247d021c344SAndy King 1248cdfbabfbSDavid Howells static int vsock_accept(struct socket *sock, struct socket *newsock, int flags, 1249cdfbabfbSDavid Howells bool kern) 1250d021c344SAndy King { 1251d021c344SAndy King struct sock *listener; 1252d021c344SAndy King int err; 1253d021c344SAndy King struct sock *connected; 1254d021c344SAndy King struct vsock_sock *vconnected; 1255d021c344SAndy King long timeout; 1256d021c344SAndy King DEFINE_WAIT(wait); 1257d021c344SAndy King 1258d021c344SAndy King err = 0; 1259d021c344SAndy King listener = sock->sk; 1260d021c344SAndy King 1261d021c344SAndy King lock_sock(listener); 1262d021c344SAndy King 1263d021c344SAndy King if (sock->type != SOCK_STREAM) { 1264d021c344SAndy King err = -EOPNOTSUPP; 1265d021c344SAndy King goto out; 1266d021c344SAndy King } 1267d021c344SAndy King 12683b4477d2SStefan Hajnoczi if (listener->sk_state != TCP_LISTEN) { 1269d021c344SAndy King err = -EINVAL; 1270d021c344SAndy King goto out; 1271d021c344SAndy King } 1272d021c344SAndy King 1273d021c344SAndy King /* Wait for children sockets to appear; these are the new sockets 1274d021c344SAndy King * created upon connection establishment. 1275d021c344SAndy King */ 1276d021c344SAndy King timeout = sock_sndtimeo(listener, flags & O_NONBLOCK); 1277d021c344SAndy King prepare_to_wait(sk_sleep(listener), &wait, TASK_INTERRUPTIBLE); 1278d021c344SAndy King 1279d021c344SAndy King while ((connected = vsock_dequeue_accept(listener)) == NULL && 1280d021c344SAndy King listener->sk_err == 0) { 1281d021c344SAndy King release_sock(listener); 1282d021c344SAndy King timeout = schedule_timeout(timeout); 1283f7f9b5e7SClaudio Imbrenda finish_wait(sk_sleep(listener), &wait); 1284d021c344SAndy King lock_sock(listener); 1285d021c344SAndy King 1286d021c344SAndy King if (signal_pending(current)) { 1287d021c344SAndy King err = sock_intr_errno(timeout); 1288f7f9b5e7SClaudio Imbrenda goto out; 1289d021c344SAndy King } else if (timeout == 0) { 1290d021c344SAndy King err = -EAGAIN; 1291f7f9b5e7SClaudio Imbrenda goto out; 1292d021c344SAndy King } 1293d021c344SAndy King 1294d021c344SAndy King prepare_to_wait(sk_sleep(listener), &wait, TASK_INTERRUPTIBLE); 1295d021c344SAndy King } 1296f7f9b5e7SClaudio Imbrenda finish_wait(sk_sleep(listener), &wait); 1297d021c344SAndy King 1298d021c344SAndy King if (listener->sk_err) 1299d021c344SAndy King err = -listener->sk_err; 1300d021c344SAndy King 1301d021c344SAndy King if (connected) { 13027976a11bSEric Dumazet sk_acceptq_removed(listener); 1303d021c344SAndy King 13044192f672SStefan Hajnoczi lock_sock_nested(connected, SINGLE_DEPTH_NESTING); 1305d021c344SAndy King vconnected = vsock_sk(connected); 1306d021c344SAndy King 1307d021c344SAndy King /* If the listener socket has received an error, then we should 1308d021c344SAndy King * reject this socket and return. Note that we simply mark the 1309d021c344SAndy King * socket rejected, drop our reference, and let the cleanup 1310d021c344SAndy King * function handle the cleanup; the fact that we found it in 1311d021c344SAndy King * the listener's accept queue guarantees that the cleanup 1312d021c344SAndy King * function hasn't run yet. 1313d021c344SAndy King */ 1314d021c344SAndy King if (err) { 1315d021c344SAndy King vconnected->rejected = true; 1316f7f9b5e7SClaudio Imbrenda } else { 1317d021c344SAndy King newsock->state = SS_CONNECTED; 1318d021c344SAndy King sock_graft(connected, newsock); 1319f7f9b5e7SClaudio Imbrenda } 1320f7f9b5e7SClaudio Imbrenda 1321d021c344SAndy King release_sock(connected); 1322d021c344SAndy King sock_put(connected); 1323d021c344SAndy King } 1324d021c344SAndy King 1325d021c344SAndy King out: 1326d021c344SAndy King release_sock(listener); 1327d021c344SAndy King return err; 1328d021c344SAndy King } 1329d021c344SAndy King 1330d021c344SAndy King static int vsock_listen(struct socket *sock, int backlog) 1331d021c344SAndy King { 1332d021c344SAndy King int err; 1333d021c344SAndy King struct sock *sk; 1334d021c344SAndy King struct vsock_sock *vsk; 1335d021c344SAndy King 1336d021c344SAndy King sk = sock->sk; 1337d021c344SAndy King 1338d021c344SAndy King lock_sock(sk); 1339d021c344SAndy King 1340d021c344SAndy King if (sock->type != SOCK_STREAM) { 1341d021c344SAndy King err = -EOPNOTSUPP; 1342d021c344SAndy King goto out; 1343d021c344SAndy King } 1344d021c344SAndy King 1345d021c344SAndy King if (sock->state != SS_UNCONNECTED) { 1346d021c344SAndy King err = -EINVAL; 1347d021c344SAndy King goto out; 1348d021c344SAndy King } 1349d021c344SAndy King 1350d021c344SAndy King vsk = vsock_sk(sk); 1351d021c344SAndy King 1352d021c344SAndy King if (!vsock_addr_bound(&vsk->local_addr)) { 1353d021c344SAndy King err = -EINVAL; 1354d021c344SAndy King goto out; 1355d021c344SAndy King } 1356d021c344SAndy King 1357d021c344SAndy King sk->sk_max_ack_backlog = backlog; 13583b4477d2SStefan Hajnoczi sk->sk_state = TCP_LISTEN; 1359d021c344SAndy King 1360d021c344SAndy King err = 0; 1361d021c344SAndy King 1362d021c344SAndy King out: 1363d021c344SAndy King release_sock(sk); 1364d021c344SAndy King return err; 1365d021c344SAndy King } 1366d021c344SAndy King 1367d021c344SAndy King static int vsock_stream_setsockopt(struct socket *sock, 1368d021c344SAndy King int level, 1369d021c344SAndy King int optname, 1370d021c344SAndy King char __user *optval, 1371d021c344SAndy King unsigned int optlen) 1372d021c344SAndy King { 1373d021c344SAndy King int err; 1374d021c344SAndy King struct sock *sk; 1375d021c344SAndy King struct vsock_sock *vsk; 1376d021c344SAndy King u64 val; 1377d021c344SAndy King 1378d021c344SAndy King if (level != AF_VSOCK) 1379d021c344SAndy King return -ENOPROTOOPT; 1380d021c344SAndy King 1381d021c344SAndy King #define COPY_IN(_v) \ 1382d021c344SAndy King do { \ 1383d021c344SAndy King if (optlen < sizeof(_v)) { \ 1384d021c344SAndy King err = -EINVAL; \ 1385d021c344SAndy King goto exit; \ 1386d021c344SAndy King } \ 1387d021c344SAndy King if (copy_from_user(&_v, optval, sizeof(_v)) != 0) { \ 1388d021c344SAndy King err = -EFAULT; \ 1389d021c344SAndy King goto exit; \ 1390d021c344SAndy King } \ 1391d021c344SAndy King } while (0) 1392d021c344SAndy King 1393d021c344SAndy King err = 0; 1394d021c344SAndy King sk = sock->sk; 1395d021c344SAndy King vsk = vsock_sk(sk); 1396d021c344SAndy King 1397d021c344SAndy King lock_sock(sk); 1398d021c344SAndy King 1399d021c344SAndy King switch (optname) { 1400d021c344SAndy King case SO_VM_SOCKETS_BUFFER_SIZE: 1401d021c344SAndy King COPY_IN(val); 1402d021c344SAndy King transport->set_buffer_size(vsk, val); 1403d021c344SAndy King break; 1404d021c344SAndy King 1405d021c344SAndy King case SO_VM_SOCKETS_BUFFER_MAX_SIZE: 1406d021c344SAndy King COPY_IN(val); 1407d021c344SAndy King transport->set_max_buffer_size(vsk, val); 1408d021c344SAndy King break; 1409d021c344SAndy King 1410d021c344SAndy King case SO_VM_SOCKETS_BUFFER_MIN_SIZE: 1411d021c344SAndy King COPY_IN(val); 1412d021c344SAndy King transport->set_min_buffer_size(vsk, val); 1413d021c344SAndy King break; 1414d021c344SAndy King 1415d021c344SAndy King case SO_VM_SOCKETS_CONNECT_TIMEOUT: { 1416fe0c72f3SArnd Bergmann struct __kernel_old_timeval tv; 1417d021c344SAndy King COPY_IN(tv); 1418d021c344SAndy King if (tv.tv_sec >= 0 && tv.tv_usec < USEC_PER_SEC && 1419d021c344SAndy King tv.tv_sec < (MAX_SCHEDULE_TIMEOUT / HZ - 1)) { 1420d021c344SAndy King vsk->connect_timeout = tv.tv_sec * HZ + 1421d021c344SAndy King DIV_ROUND_UP(tv.tv_usec, (1000000 / HZ)); 1422d021c344SAndy King if (vsk->connect_timeout == 0) 1423d021c344SAndy King vsk->connect_timeout = 1424d021c344SAndy King VSOCK_DEFAULT_CONNECT_TIMEOUT; 1425d021c344SAndy King 1426d021c344SAndy King } else { 1427d021c344SAndy King err = -ERANGE; 1428d021c344SAndy King } 1429d021c344SAndy King break; 1430d021c344SAndy King } 1431d021c344SAndy King 1432d021c344SAndy King default: 1433d021c344SAndy King err = -ENOPROTOOPT; 1434d021c344SAndy King break; 1435d021c344SAndy King } 1436d021c344SAndy King 1437d021c344SAndy King #undef COPY_IN 1438d021c344SAndy King 1439d021c344SAndy King exit: 1440d021c344SAndy King release_sock(sk); 1441d021c344SAndy King return err; 1442d021c344SAndy King } 1443d021c344SAndy King 1444d021c344SAndy King static int vsock_stream_getsockopt(struct socket *sock, 1445d021c344SAndy King int level, int optname, 1446d021c344SAndy King char __user *optval, 1447d021c344SAndy King int __user *optlen) 1448d021c344SAndy King { 1449d021c344SAndy King int err; 1450d021c344SAndy King int len; 1451d021c344SAndy King struct sock *sk; 1452d021c344SAndy King struct vsock_sock *vsk; 1453d021c344SAndy King u64 val; 1454d021c344SAndy King 1455d021c344SAndy King if (level != AF_VSOCK) 1456d021c344SAndy King return -ENOPROTOOPT; 1457d021c344SAndy King 1458d021c344SAndy King err = get_user(len, optlen); 1459d021c344SAndy King if (err != 0) 1460d021c344SAndy King return err; 1461d021c344SAndy King 1462d021c344SAndy King #define COPY_OUT(_v) \ 1463d021c344SAndy King do { \ 1464d021c344SAndy King if (len < sizeof(_v)) \ 1465d021c344SAndy King return -EINVAL; \ 1466d021c344SAndy King \ 1467d021c344SAndy King len = sizeof(_v); \ 1468d021c344SAndy King if (copy_to_user(optval, &_v, len) != 0) \ 1469d021c344SAndy King return -EFAULT; \ 1470d021c344SAndy King \ 1471d021c344SAndy King } while (0) 1472d021c344SAndy King 1473d021c344SAndy King err = 0; 1474d021c344SAndy King sk = sock->sk; 1475d021c344SAndy King vsk = vsock_sk(sk); 1476d021c344SAndy King 1477d021c344SAndy King switch (optname) { 1478d021c344SAndy King case SO_VM_SOCKETS_BUFFER_SIZE: 1479d021c344SAndy King val = transport->get_buffer_size(vsk); 1480d021c344SAndy King COPY_OUT(val); 1481d021c344SAndy King break; 1482d021c344SAndy King 1483d021c344SAndy King case SO_VM_SOCKETS_BUFFER_MAX_SIZE: 1484d021c344SAndy King val = transport->get_max_buffer_size(vsk); 1485d021c344SAndy King COPY_OUT(val); 1486d021c344SAndy King break; 1487d021c344SAndy King 1488d021c344SAndy King case SO_VM_SOCKETS_BUFFER_MIN_SIZE: 1489d021c344SAndy King val = transport->get_min_buffer_size(vsk); 1490d021c344SAndy King COPY_OUT(val); 1491d021c344SAndy King break; 1492d021c344SAndy King 1493d021c344SAndy King case SO_VM_SOCKETS_CONNECT_TIMEOUT: { 1494fe0c72f3SArnd Bergmann struct __kernel_old_timeval tv; 1495d021c344SAndy King tv.tv_sec = vsk->connect_timeout / HZ; 1496d021c344SAndy King tv.tv_usec = 1497d021c344SAndy King (vsk->connect_timeout - 1498d021c344SAndy King tv.tv_sec * HZ) * (1000000 / HZ); 1499d021c344SAndy King COPY_OUT(tv); 1500d021c344SAndy King break; 1501d021c344SAndy King } 1502d021c344SAndy King default: 1503d021c344SAndy King return -ENOPROTOOPT; 1504d021c344SAndy King } 1505d021c344SAndy King 1506d021c344SAndy King err = put_user(len, optlen); 1507d021c344SAndy King if (err != 0) 1508d021c344SAndy King return -EFAULT; 1509d021c344SAndy King 1510d021c344SAndy King #undef COPY_OUT 1511d021c344SAndy King 1512d021c344SAndy King return 0; 1513d021c344SAndy King } 1514d021c344SAndy King 15151b784140SYing Xue static int vsock_stream_sendmsg(struct socket *sock, struct msghdr *msg, 15161b784140SYing Xue size_t len) 1517d021c344SAndy King { 1518d021c344SAndy King struct sock *sk; 1519d021c344SAndy King struct vsock_sock *vsk; 1520d021c344SAndy King ssize_t total_written; 1521d021c344SAndy King long timeout; 1522d021c344SAndy King int err; 1523d021c344SAndy King struct vsock_transport_send_notify_data send_data; 1524499fde66SWANG Cong DEFINE_WAIT_FUNC(wait, woken_wake_function); 1525d021c344SAndy King 1526d021c344SAndy King sk = sock->sk; 1527d021c344SAndy King vsk = vsock_sk(sk); 1528d021c344SAndy King total_written = 0; 1529d021c344SAndy King err = 0; 1530d021c344SAndy King 1531d021c344SAndy King if (msg->msg_flags & MSG_OOB) 1532d021c344SAndy King return -EOPNOTSUPP; 1533d021c344SAndy King 1534d021c344SAndy King lock_sock(sk); 1535d021c344SAndy King 1536d021c344SAndy King /* Callers should not provide a destination with stream sockets. */ 1537d021c344SAndy King if (msg->msg_namelen) { 15383b4477d2SStefan Hajnoczi err = sk->sk_state == TCP_ESTABLISHED ? -EISCONN : -EOPNOTSUPP; 1539d021c344SAndy King goto out; 1540d021c344SAndy King } 1541d021c344SAndy King 1542d021c344SAndy King /* Send data only if both sides are not shutdown in the direction. */ 1543d021c344SAndy King if (sk->sk_shutdown & SEND_SHUTDOWN || 1544d021c344SAndy King vsk->peer_shutdown & RCV_SHUTDOWN) { 1545d021c344SAndy King err = -EPIPE; 1546d021c344SAndy King goto out; 1547d021c344SAndy King } 1548d021c344SAndy King 15493b4477d2SStefan Hajnoczi if (sk->sk_state != TCP_ESTABLISHED || 1550d021c344SAndy King !vsock_addr_bound(&vsk->local_addr)) { 1551d021c344SAndy King err = -ENOTCONN; 1552d021c344SAndy King goto out; 1553d021c344SAndy King } 1554d021c344SAndy King 1555d021c344SAndy King if (!vsock_addr_bound(&vsk->remote_addr)) { 1556d021c344SAndy King err = -EDESTADDRREQ; 1557d021c344SAndy King goto out; 1558d021c344SAndy King } 1559d021c344SAndy King 1560d021c344SAndy King /* Wait for room in the produce queue to enqueue our user's data. */ 1561d021c344SAndy King timeout = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT); 1562d021c344SAndy King 1563d021c344SAndy King err = transport->notify_send_init(vsk, &send_data); 1564d021c344SAndy King if (err < 0) 1565d021c344SAndy King goto out; 1566d021c344SAndy King 1567d021c344SAndy King while (total_written < len) { 1568d021c344SAndy King ssize_t written; 1569d021c344SAndy King 1570499fde66SWANG Cong add_wait_queue(sk_sleep(sk), &wait); 1571d021c344SAndy King while (vsock_stream_has_space(vsk) == 0 && 1572d021c344SAndy King sk->sk_err == 0 && 1573d021c344SAndy King !(sk->sk_shutdown & SEND_SHUTDOWN) && 1574d021c344SAndy King !(vsk->peer_shutdown & RCV_SHUTDOWN)) { 1575d021c344SAndy King 1576d021c344SAndy King /* Don't wait for non-blocking sockets. */ 1577d021c344SAndy King if (timeout == 0) { 1578d021c344SAndy King err = -EAGAIN; 1579499fde66SWANG Cong remove_wait_queue(sk_sleep(sk), &wait); 1580f7f9b5e7SClaudio Imbrenda goto out_err; 1581d021c344SAndy King } 1582d021c344SAndy King 1583d021c344SAndy King err = transport->notify_send_pre_block(vsk, &send_data); 1584f7f9b5e7SClaudio Imbrenda if (err < 0) { 1585499fde66SWANG Cong remove_wait_queue(sk_sleep(sk), &wait); 1586f7f9b5e7SClaudio Imbrenda goto out_err; 1587f7f9b5e7SClaudio Imbrenda } 1588d021c344SAndy King 1589d021c344SAndy King release_sock(sk); 1590499fde66SWANG Cong timeout = wait_woken(&wait, TASK_INTERRUPTIBLE, timeout); 1591d021c344SAndy King lock_sock(sk); 1592d021c344SAndy King if (signal_pending(current)) { 1593d021c344SAndy King err = sock_intr_errno(timeout); 1594499fde66SWANG Cong remove_wait_queue(sk_sleep(sk), &wait); 1595f7f9b5e7SClaudio Imbrenda goto out_err; 1596d021c344SAndy King } else if (timeout == 0) { 1597d021c344SAndy King err = -EAGAIN; 1598499fde66SWANG Cong remove_wait_queue(sk_sleep(sk), &wait); 1599f7f9b5e7SClaudio Imbrenda goto out_err; 1600d021c344SAndy King } 1601d021c344SAndy King } 1602499fde66SWANG Cong remove_wait_queue(sk_sleep(sk), &wait); 1603d021c344SAndy King 1604d021c344SAndy King /* These checks occur both as part of and after the loop 1605d021c344SAndy King * conditional since we need to check before and after 1606d021c344SAndy King * sleeping. 1607d021c344SAndy King */ 1608d021c344SAndy King if (sk->sk_err) { 1609d021c344SAndy King err = -sk->sk_err; 1610f7f9b5e7SClaudio Imbrenda goto out_err; 1611d021c344SAndy King } else if ((sk->sk_shutdown & SEND_SHUTDOWN) || 1612d021c344SAndy King (vsk->peer_shutdown & RCV_SHUTDOWN)) { 1613d021c344SAndy King err = -EPIPE; 1614f7f9b5e7SClaudio Imbrenda goto out_err; 1615d021c344SAndy King } 1616d021c344SAndy King 1617d021c344SAndy King err = transport->notify_send_pre_enqueue(vsk, &send_data); 1618d021c344SAndy King if (err < 0) 1619f7f9b5e7SClaudio Imbrenda goto out_err; 1620d021c344SAndy King 1621d021c344SAndy King /* Note that enqueue will only write as many bytes as are free 1622d021c344SAndy King * in the produce queue, so we don't need to ensure len is 1623d021c344SAndy King * smaller than the queue size. It is the caller's 1624d021c344SAndy King * responsibility to check how many bytes we were able to send. 1625d021c344SAndy King */ 1626d021c344SAndy King 1627d021c344SAndy King written = transport->stream_enqueue( 16280f7db23aSAl Viro vsk, msg, 1629d021c344SAndy King len - total_written); 1630d021c344SAndy King if (written < 0) { 1631d021c344SAndy King err = -ENOMEM; 1632f7f9b5e7SClaudio Imbrenda goto out_err; 1633d021c344SAndy King } 1634d021c344SAndy King 1635d021c344SAndy King total_written += written; 1636d021c344SAndy King 1637d021c344SAndy King err = transport->notify_send_post_enqueue( 1638d021c344SAndy King vsk, written, &send_data); 1639d021c344SAndy King if (err < 0) 1640f7f9b5e7SClaudio Imbrenda goto out_err; 1641d021c344SAndy King 1642d021c344SAndy King } 1643d021c344SAndy King 1644f7f9b5e7SClaudio Imbrenda out_err: 1645d021c344SAndy King if (total_written > 0) 1646d021c344SAndy King err = total_written; 1647d021c344SAndy King out: 1648d021c344SAndy King release_sock(sk); 1649d021c344SAndy King return err; 1650d021c344SAndy King } 1651d021c344SAndy King 1652d021c344SAndy King 1653d021c344SAndy King static int 16541b784140SYing Xue vsock_stream_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, 16551b784140SYing Xue int flags) 1656d021c344SAndy King { 1657d021c344SAndy King struct sock *sk; 1658d021c344SAndy King struct vsock_sock *vsk; 1659d021c344SAndy King int err; 1660d021c344SAndy King size_t target; 1661d021c344SAndy King ssize_t copied; 1662d021c344SAndy King long timeout; 1663d021c344SAndy King struct vsock_transport_recv_notify_data recv_data; 1664d021c344SAndy King 1665d021c344SAndy King DEFINE_WAIT(wait); 1666d021c344SAndy King 1667d021c344SAndy King sk = sock->sk; 1668d021c344SAndy King vsk = vsock_sk(sk); 1669d021c344SAndy King err = 0; 1670d021c344SAndy King 1671d021c344SAndy King lock_sock(sk); 1672d021c344SAndy King 16733b4477d2SStefan Hajnoczi if (sk->sk_state != TCP_ESTABLISHED) { 1674d021c344SAndy King /* Recvmsg is supposed to return 0 if a peer performs an 1675d021c344SAndy King * orderly shutdown. Differentiate between that case and when a 1676d021c344SAndy King * peer has not connected or a local shutdown occured with the 1677d021c344SAndy King * SOCK_DONE flag. 1678d021c344SAndy King */ 1679d021c344SAndy King if (sock_flag(sk, SOCK_DONE)) 1680d021c344SAndy King err = 0; 1681d021c344SAndy King else 1682d021c344SAndy King err = -ENOTCONN; 1683d021c344SAndy King 1684d021c344SAndy King goto out; 1685d021c344SAndy King } 1686d021c344SAndy King 1687d021c344SAndy King if (flags & MSG_OOB) { 1688d021c344SAndy King err = -EOPNOTSUPP; 1689d021c344SAndy King goto out; 1690d021c344SAndy King } 1691d021c344SAndy King 1692d021c344SAndy King /* We don't check peer_shutdown flag here since peer may actually shut 1693d021c344SAndy King * down, but there can be data in the queue that a local socket can 1694d021c344SAndy King * receive. 1695d021c344SAndy King */ 1696d021c344SAndy King if (sk->sk_shutdown & RCV_SHUTDOWN) { 1697d021c344SAndy King err = 0; 1698d021c344SAndy King goto out; 1699d021c344SAndy King } 1700d021c344SAndy King 1701d021c344SAndy King /* It is valid on Linux to pass in a zero-length receive buffer. This 1702d021c344SAndy King * is not an error. We may as well bail out now. 1703d021c344SAndy King */ 1704d021c344SAndy King if (!len) { 1705d021c344SAndy King err = 0; 1706d021c344SAndy King goto out; 1707d021c344SAndy King } 1708d021c344SAndy King 1709d021c344SAndy King /* We must not copy less than target bytes into the user's buffer 1710d021c344SAndy King * before returning successfully, so we wait for the consume queue to 1711d021c344SAndy King * have that much data to consume before dequeueing. Note that this 1712d021c344SAndy King * makes it impossible to handle cases where target is greater than the 1713d021c344SAndy King * queue size. 1714d021c344SAndy King */ 1715d021c344SAndy King target = sock_rcvlowat(sk, flags & MSG_WAITALL, len); 1716d021c344SAndy King if (target >= transport->stream_rcvhiwat(vsk)) { 1717d021c344SAndy King err = -ENOMEM; 1718d021c344SAndy King goto out; 1719d021c344SAndy King } 1720d021c344SAndy King timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); 1721d021c344SAndy King copied = 0; 1722d021c344SAndy King 1723d021c344SAndy King err = transport->notify_recv_init(vsk, target, &recv_data); 1724d021c344SAndy King if (err < 0) 1725d021c344SAndy King goto out; 1726d021c344SAndy King 1727d021c344SAndy King 1728d021c344SAndy King while (1) { 1729f7f9b5e7SClaudio Imbrenda s64 ready; 1730f7f9b5e7SClaudio Imbrenda 1731f7f9b5e7SClaudio Imbrenda prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 1732f7f9b5e7SClaudio Imbrenda ready = vsock_stream_has_data(vsk); 1733f7f9b5e7SClaudio Imbrenda 1734f7f9b5e7SClaudio Imbrenda if (ready == 0) { 1735f7f9b5e7SClaudio Imbrenda if (sk->sk_err != 0 || 1736f7f9b5e7SClaudio Imbrenda (sk->sk_shutdown & RCV_SHUTDOWN) || 1737f7f9b5e7SClaudio Imbrenda (vsk->peer_shutdown & SEND_SHUTDOWN)) { 1738f7f9b5e7SClaudio Imbrenda finish_wait(sk_sleep(sk), &wait); 1739f7f9b5e7SClaudio Imbrenda break; 1740f7f9b5e7SClaudio Imbrenda } 1741f7f9b5e7SClaudio Imbrenda /* Don't wait for non-blocking sockets. */ 1742f7f9b5e7SClaudio Imbrenda if (timeout == 0) { 1743f7f9b5e7SClaudio Imbrenda err = -EAGAIN; 1744f7f9b5e7SClaudio Imbrenda finish_wait(sk_sleep(sk), &wait); 1745f7f9b5e7SClaudio Imbrenda break; 1746f7f9b5e7SClaudio Imbrenda } 1747f7f9b5e7SClaudio Imbrenda 1748f7f9b5e7SClaudio Imbrenda err = transport->notify_recv_pre_block( 1749f7f9b5e7SClaudio Imbrenda vsk, target, &recv_data); 1750f7f9b5e7SClaudio Imbrenda if (err < 0) { 1751f7f9b5e7SClaudio Imbrenda finish_wait(sk_sleep(sk), &wait); 1752f7f9b5e7SClaudio Imbrenda break; 1753f7f9b5e7SClaudio Imbrenda } 1754f7f9b5e7SClaudio Imbrenda release_sock(sk); 1755f7f9b5e7SClaudio Imbrenda timeout = schedule_timeout(timeout); 1756f7f9b5e7SClaudio Imbrenda lock_sock(sk); 1757f7f9b5e7SClaudio Imbrenda 1758f7f9b5e7SClaudio Imbrenda if (signal_pending(current)) { 1759f7f9b5e7SClaudio Imbrenda err = sock_intr_errno(timeout); 1760f7f9b5e7SClaudio Imbrenda finish_wait(sk_sleep(sk), &wait); 1761f7f9b5e7SClaudio Imbrenda break; 1762f7f9b5e7SClaudio Imbrenda } else if (timeout == 0) { 1763f7f9b5e7SClaudio Imbrenda err = -EAGAIN; 1764f7f9b5e7SClaudio Imbrenda finish_wait(sk_sleep(sk), &wait); 1765f7f9b5e7SClaudio Imbrenda break; 1766f7f9b5e7SClaudio Imbrenda } 1767f7f9b5e7SClaudio Imbrenda } else { 1768f7f9b5e7SClaudio Imbrenda ssize_t read; 1769f7f9b5e7SClaudio Imbrenda 1770f7f9b5e7SClaudio Imbrenda finish_wait(sk_sleep(sk), &wait); 1771d021c344SAndy King 1772d021c344SAndy King if (ready < 0) { 1773f7f9b5e7SClaudio Imbrenda /* Invalid queue pair content. XXX This should 1774f7f9b5e7SClaudio Imbrenda * be changed to a connection reset in a later 1775f7f9b5e7SClaudio Imbrenda * change. 1776d021c344SAndy King */ 1777d021c344SAndy King 1778d021c344SAndy King err = -ENOMEM; 1779f7f9b5e7SClaudio Imbrenda goto out; 1780f7f9b5e7SClaudio Imbrenda } 1781d021c344SAndy King 1782d021c344SAndy King err = transport->notify_recv_pre_dequeue( 1783d021c344SAndy King vsk, target, &recv_data); 1784d021c344SAndy King if (err < 0) 1785d021c344SAndy King break; 1786d021c344SAndy King 1787d021c344SAndy King read = transport->stream_dequeue( 17880f7db23aSAl Viro vsk, msg, 1789d021c344SAndy King len - copied, flags); 1790d021c344SAndy King if (read < 0) { 1791d021c344SAndy King err = -ENOMEM; 1792d021c344SAndy King break; 1793d021c344SAndy King } 1794d021c344SAndy King 1795d021c344SAndy King copied += read; 1796d021c344SAndy King 1797d021c344SAndy King err = transport->notify_recv_post_dequeue( 1798d021c344SAndy King vsk, target, read, 1799d021c344SAndy King !(flags & MSG_PEEK), &recv_data); 1800d021c344SAndy King if (err < 0) 1801f7f9b5e7SClaudio Imbrenda goto out; 1802d021c344SAndy King 1803d021c344SAndy King if (read >= target || flags & MSG_PEEK) 1804d021c344SAndy King break; 1805d021c344SAndy King 1806d021c344SAndy King target -= read; 1807d021c344SAndy King } 1808d021c344SAndy King } 1809d021c344SAndy King 1810d021c344SAndy King if (sk->sk_err) 1811d021c344SAndy King err = -sk->sk_err; 1812d021c344SAndy King else if (sk->sk_shutdown & RCV_SHUTDOWN) 1813d021c344SAndy King err = 0; 1814d021c344SAndy King 1815dedc58e0SIan Campbell if (copied > 0) 1816d021c344SAndy King err = copied; 1817d021c344SAndy King 1818d021c344SAndy King out: 1819d021c344SAndy King release_sock(sk); 1820d021c344SAndy King return err; 1821d021c344SAndy King } 1822d021c344SAndy King 1823d021c344SAndy King static const struct proto_ops vsock_stream_ops = { 1824d021c344SAndy King .family = PF_VSOCK, 1825d021c344SAndy King .owner = THIS_MODULE, 1826d021c344SAndy King .release = vsock_release, 1827d021c344SAndy King .bind = vsock_bind, 1828d021c344SAndy King .connect = vsock_stream_connect, 1829d021c344SAndy King .socketpair = sock_no_socketpair, 1830d021c344SAndy King .accept = vsock_accept, 1831d021c344SAndy King .getname = vsock_getname, 1832a11e1d43SLinus Torvalds .poll = vsock_poll, 1833d021c344SAndy King .ioctl = sock_no_ioctl, 1834d021c344SAndy King .listen = vsock_listen, 1835d021c344SAndy King .shutdown = vsock_shutdown, 1836d021c344SAndy King .setsockopt = vsock_stream_setsockopt, 1837d021c344SAndy King .getsockopt = vsock_stream_getsockopt, 1838d021c344SAndy King .sendmsg = vsock_stream_sendmsg, 1839d021c344SAndy King .recvmsg = vsock_stream_recvmsg, 1840d021c344SAndy King .mmap = sock_no_mmap, 1841d021c344SAndy King .sendpage = sock_no_sendpage, 1842d021c344SAndy King }; 1843d021c344SAndy King 1844d021c344SAndy King static int vsock_create(struct net *net, struct socket *sock, 1845d021c344SAndy King int protocol, int kern) 1846d021c344SAndy King { 1847d021c344SAndy King if (!sock) 1848d021c344SAndy King return -EINVAL; 1849d021c344SAndy King 18506cf1c5fcSAndy King if (protocol && protocol != PF_VSOCK) 1851d021c344SAndy King return -EPROTONOSUPPORT; 1852d021c344SAndy King 1853d021c344SAndy King switch (sock->type) { 1854d021c344SAndy King case SOCK_DGRAM: 1855d021c344SAndy King sock->ops = &vsock_dgram_ops; 1856d021c344SAndy King break; 1857d021c344SAndy King case SOCK_STREAM: 1858d021c344SAndy King sock->ops = &vsock_stream_ops; 1859d021c344SAndy King break; 1860d021c344SAndy King default: 1861d021c344SAndy King return -ESOCKTNOSUPPORT; 1862d021c344SAndy King } 1863d021c344SAndy King 1864d021c344SAndy King sock->state = SS_UNCONNECTED; 1865d021c344SAndy King 186611aa9c28SEric W. Biederman return __vsock_create(net, sock, NULL, GFP_KERNEL, 0, kern) ? 0 : -ENOMEM; 1867d021c344SAndy King } 1868d021c344SAndy King 1869d021c344SAndy King static const struct net_proto_family vsock_family_ops = { 1870d021c344SAndy King .family = AF_VSOCK, 1871d021c344SAndy King .create = vsock_create, 1872d021c344SAndy King .owner = THIS_MODULE, 1873d021c344SAndy King }; 1874d021c344SAndy King 1875d021c344SAndy King static long vsock_dev_do_ioctl(struct file *filp, 1876d021c344SAndy King unsigned int cmd, void __user *ptr) 1877d021c344SAndy King { 1878d021c344SAndy King u32 __user *p = ptr; 1879d021c344SAndy King int retval = 0; 1880d021c344SAndy King 1881d021c344SAndy King switch (cmd) { 1882d021c344SAndy King case IOCTL_VM_SOCKETS_GET_LOCAL_CID: 1883d021c344SAndy King if (put_user(transport->get_local_cid(), p) != 0) 1884d021c344SAndy King retval = -EFAULT; 1885d021c344SAndy King break; 1886d021c344SAndy King 1887d021c344SAndy King default: 1888d021c344SAndy King pr_err("Unknown ioctl %d\n", cmd); 1889d021c344SAndy King retval = -EINVAL; 1890d021c344SAndy King } 1891d021c344SAndy King 1892d021c344SAndy King return retval; 1893d021c344SAndy King } 1894d021c344SAndy King 1895d021c344SAndy King static long vsock_dev_ioctl(struct file *filp, 1896d021c344SAndy King unsigned int cmd, unsigned long arg) 1897d021c344SAndy King { 1898d021c344SAndy King return vsock_dev_do_ioctl(filp, cmd, (void __user *)arg); 1899d021c344SAndy King } 1900d021c344SAndy King 1901d021c344SAndy King #ifdef CONFIG_COMPAT 1902d021c344SAndy King static long vsock_dev_compat_ioctl(struct file *filp, 1903d021c344SAndy King unsigned int cmd, unsigned long arg) 1904d021c344SAndy King { 1905d021c344SAndy King return vsock_dev_do_ioctl(filp, cmd, compat_ptr(arg)); 1906d021c344SAndy King } 1907d021c344SAndy King #endif 1908d021c344SAndy King 1909d021c344SAndy King static const struct file_operations vsock_device_ops = { 1910d021c344SAndy King .owner = THIS_MODULE, 1911d021c344SAndy King .unlocked_ioctl = vsock_dev_ioctl, 1912d021c344SAndy King #ifdef CONFIG_COMPAT 1913d021c344SAndy King .compat_ioctl = vsock_dev_compat_ioctl, 1914d021c344SAndy King #endif 1915d021c344SAndy King .open = nonseekable_open, 1916d021c344SAndy King }; 1917d021c344SAndy King 1918d021c344SAndy King static struct miscdevice vsock_device = { 1919d021c344SAndy King .name = "vsock", 1920d021c344SAndy King .fops = &vsock_device_ops, 1921d021c344SAndy King }; 1922d021c344SAndy King 19232c4a336eSAndy King int __vsock_core_init(const struct vsock_transport *t, struct module *owner) 1924d021c344SAndy King { 19252c4a336eSAndy King int err = mutex_lock_interruptible(&vsock_register_mutex); 19262c4a336eSAndy King 19272c4a336eSAndy King if (err) 19282c4a336eSAndy King return err; 19292c4a336eSAndy King 19302c4a336eSAndy King if (transport) { 19312c4a336eSAndy King err = -EBUSY; 19322c4a336eSAndy King goto err_busy; 19332c4a336eSAndy King } 19342c4a336eSAndy King 19352c4a336eSAndy King /* Transport must be the owner of the protocol so that it can't 19362c4a336eSAndy King * unload while there are open sockets. 19372c4a336eSAndy King */ 19382c4a336eSAndy King vsock_proto.owner = owner; 19392c4a336eSAndy King transport = t; 1940d021c344SAndy King 19416ad0b2f7SAsias He vsock_device.minor = MISC_DYNAMIC_MINOR; 1942d021c344SAndy King err = misc_register(&vsock_device); 1943d021c344SAndy King if (err) { 1944d021c344SAndy King pr_err("Failed to register misc device\n"); 1945f6a835bbSGao feng goto err_reset_transport; 1946d021c344SAndy King } 1947d021c344SAndy King 1948d021c344SAndy King err = proto_register(&vsock_proto, 1); /* we want our slab */ 1949d021c344SAndy King if (err) { 1950d021c344SAndy King pr_err("Cannot register vsock protocol\n"); 1951f6a835bbSGao feng goto err_deregister_misc; 1952d021c344SAndy King } 1953d021c344SAndy King 1954d021c344SAndy King err = sock_register(&vsock_family_ops); 1955d021c344SAndy King if (err) { 1956d021c344SAndy King pr_err("could not register af_vsock (%d) address family: %d\n", 1957d021c344SAndy King AF_VSOCK, err); 1958d021c344SAndy King goto err_unregister_proto; 1959d021c344SAndy King } 1960d021c344SAndy King 19612c4a336eSAndy King mutex_unlock(&vsock_register_mutex); 1962d021c344SAndy King return 0; 1963d021c344SAndy King 1964d021c344SAndy King err_unregister_proto: 1965d021c344SAndy King proto_unregister(&vsock_proto); 1966f6a835bbSGao feng err_deregister_misc: 1967d021c344SAndy King misc_deregister(&vsock_device); 1968f6a835bbSGao feng err_reset_transport: 19692c4a336eSAndy King transport = NULL; 19702c4a336eSAndy King err_busy: 19712c4a336eSAndy King mutex_unlock(&vsock_register_mutex); 1972d021c344SAndy King return err; 1973d021c344SAndy King } 19742c4a336eSAndy King EXPORT_SYMBOL_GPL(__vsock_core_init); 1975d021c344SAndy King 1976d021c344SAndy King void vsock_core_exit(void) 1977d021c344SAndy King { 1978d021c344SAndy King mutex_lock(&vsock_register_mutex); 1979d021c344SAndy King 1980d021c344SAndy King misc_deregister(&vsock_device); 1981d021c344SAndy King sock_unregister(AF_VSOCK); 1982d021c344SAndy King proto_unregister(&vsock_proto); 1983d021c344SAndy King 1984d021c344SAndy King /* We do not want the assignment below re-ordered. */ 1985d021c344SAndy King mb(); 1986d021c344SAndy King transport = NULL; 1987d021c344SAndy King 1988d021c344SAndy King mutex_unlock(&vsock_register_mutex); 1989d021c344SAndy King } 1990d021c344SAndy King EXPORT_SYMBOL_GPL(vsock_core_exit); 1991d021c344SAndy King 19920b01aeb3SStefan Hajnoczi const struct vsock_transport *vsock_core_get_transport(void) 19930b01aeb3SStefan Hajnoczi { 19940b01aeb3SStefan Hajnoczi /* vsock_register_mutex not taken since only the transport uses this 19950b01aeb3SStefan Hajnoczi * function and only while registered. 19960b01aeb3SStefan Hajnoczi */ 19970b01aeb3SStefan Hajnoczi return transport; 19980b01aeb3SStefan Hajnoczi } 19990b01aeb3SStefan Hajnoczi EXPORT_SYMBOL_GPL(vsock_core_get_transport); 20000b01aeb3SStefan Hajnoczi 200105e489b1SStefan Hajnoczi static void __exit vsock_exit(void) 200205e489b1SStefan Hajnoczi { 200305e489b1SStefan Hajnoczi /* Do nothing. This function makes this module removable. */ 200405e489b1SStefan Hajnoczi } 200505e489b1SStefan Hajnoczi 2006c1eef220SCong Wang module_init(vsock_init_tables); 200705e489b1SStefan Hajnoczi module_exit(vsock_exit); 2008c1eef220SCong Wang 2009d021c344SAndy King MODULE_AUTHOR("VMware, Inc."); 2010d021c344SAndy King MODULE_DESCRIPTION("VMware Virtual Socket Family"); 20111190cfdbSJorgen Hansen MODULE_VERSION("1.0.2.0-k"); 2012d021c344SAndy King MODULE_LICENSE("GPL v2"); 2013