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 88b6459415SJakub Kicinski #include <linux/compat.h> 89d021c344SAndy King #include <linux/types.h> 90d021c344SAndy King #include <linux/bitops.h> 91d021c344SAndy King #include <linux/cred.h> 92d021c344SAndy King #include <linux/init.h> 93d021c344SAndy King #include <linux/io.h> 94d021c344SAndy King #include <linux/kernel.h> 95174cd4b1SIngo Molnar #include <linux/sched/signal.h> 96d021c344SAndy King #include <linux/kmod.h> 97d021c344SAndy King #include <linux/list.h> 98d021c344SAndy King #include <linux/miscdevice.h> 99d021c344SAndy King #include <linux/module.h> 100d021c344SAndy King #include <linux/mutex.h> 101d021c344SAndy King #include <linux/net.h> 102d021c344SAndy King #include <linux/poll.h> 1038236b08cSLepton Wu #include <linux/random.h> 104d021c344SAndy King #include <linux/skbuff.h> 105d021c344SAndy King #include <linux/smp.h> 106d021c344SAndy King #include <linux/socket.h> 107d021c344SAndy King #include <linux/stddef.h> 108d021c344SAndy King #include <linux/unistd.h> 109d021c344SAndy King #include <linux/wait.h> 110d021c344SAndy King #include <linux/workqueue.h> 111d021c344SAndy King #include <net/sock.h> 11282a54d0eSAsias He #include <net/af_vsock.h> 113d021c344SAndy King 114d021c344SAndy King static int __vsock_bind(struct sock *sk, struct sockaddr_vm *addr); 115d021c344SAndy King static void vsock_sk_destruct(struct sock *sk); 116d021c344SAndy King static int vsock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb); 117d021c344SAndy King 118d021c344SAndy King /* Protocol family. */ 119d021c344SAndy King static struct proto vsock_proto = { 120d021c344SAndy King .name = "AF_VSOCK", 121d021c344SAndy King .owner = THIS_MODULE, 122d021c344SAndy King .obj_size = sizeof(struct vsock_sock), 123d021c344SAndy King }; 124d021c344SAndy King 125d021c344SAndy King /* The default peer timeout indicates how long we will wait for a peer response 126d021c344SAndy King * to a control message. 127d021c344SAndy King */ 128d021c344SAndy King #define VSOCK_DEFAULT_CONNECT_TIMEOUT (2 * HZ) 129d021c344SAndy King 130b9f2b0ffSStefano Garzarella #define VSOCK_DEFAULT_BUFFER_SIZE (1024 * 256) 131b9f2b0ffSStefano Garzarella #define VSOCK_DEFAULT_BUFFER_MAX_SIZE (1024 * 256) 132b9f2b0ffSStefano Garzarella #define VSOCK_DEFAULT_BUFFER_MIN_SIZE 128 133b9f2b0ffSStefano Garzarella 134c0cfa2d8SStefano Garzarella /* Transport used for host->guest communication */ 135c0cfa2d8SStefano Garzarella static const struct vsock_transport *transport_h2g; 136c0cfa2d8SStefano Garzarella /* Transport used for guest->host communication */ 137c0cfa2d8SStefano Garzarella static const struct vsock_transport *transport_g2h; 138c0cfa2d8SStefano Garzarella /* Transport used for DGRAM communication */ 139c0cfa2d8SStefano Garzarella static const struct vsock_transport *transport_dgram; 1400e121905SStefano Garzarella /* Transport used for local communication */ 1410e121905SStefano Garzarella static const struct vsock_transport *transport_local; 142d021c344SAndy King static DEFINE_MUTEX(vsock_register_mutex); 143d021c344SAndy King 144d021c344SAndy King /**** UTILS ****/ 145d021c344SAndy King 146d021c344SAndy King /* Each bound VSocket is stored in the bind hash table and each connected 147d021c344SAndy King * VSocket is stored in the connected hash table. 148d021c344SAndy King * 149d021c344SAndy King * Unbound sockets are all put on the same list attached to the end of the hash 150d021c344SAndy King * table (vsock_unbound_sockets). Bound sockets are added to the hash table in 151d021c344SAndy King * the bucket that their local address hashes to (vsock_bound_sockets(addr) 152d021c344SAndy King * represents the list that addr hashes to). 153d021c344SAndy King * 154d021c344SAndy King * Specifically, we initialize the vsock_bind_table array to a size of 155d021c344SAndy King * VSOCK_HASH_SIZE + 1 so that vsock_bind_table[0] through 156d021c344SAndy King * vsock_bind_table[VSOCK_HASH_SIZE - 1] are for bound sockets and 157d021c344SAndy King * vsock_bind_table[VSOCK_HASH_SIZE] is for unbound sockets. The hash function 158a49dd9dcSAsias He * mods with VSOCK_HASH_SIZE to ensure this. 159d021c344SAndy King */ 160d021c344SAndy King #define MAX_PORT_RETRIES 24 161d021c344SAndy King 162a49dd9dcSAsias He #define VSOCK_HASH(addr) ((addr)->svm_port % VSOCK_HASH_SIZE) 163d021c344SAndy King #define vsock_bound_sockets(addr) (&vsock_bind_table[VSOCK_HASH(addr)]) 164d021c344SAndy King #define vsock_unbound_sockets (&vsock_bind_table[VSOCK_HASH_SIZE]) 165d021c344SAndy King 166d021c344SAndy King /* XXX This can probably be implemented in a better way. */ 167d021c344SAndy King #define VSOCK_CONN_HASH(src, dst) \ 168a49dd9dcSAsias He (((src)->svm_cid ^ (dst)->svm_port) % VSOCK_HASH_SIZE) 169d021c344SAndy King #define vsock_connected_sockets(src, dst) \ 170d021c344SAndy King (&vsock_connected_table[VSOCK_CONN_HASH(src, dst)]) 171d021c344SAndy King #define vsock_connected_sockets_vsk(vsk) \ 172d021c344SAndy King vsock_connected_sockets(&(vsk)->remote_addr, &(vsk)->local_addr) 173d021c344SAndy King 17444f20980SStefan Hajnoczi struct list_head vsock_bind_table[VSOCK_HASH_SIZE + 1]; 17544f20980SStefan Hajnoczi EXPORT_SYMBOL_GPL(vsock_bind_table); 17644f20980SStefan Hajnoczi struct list_head vsock_connected_table[VSOCK_HASH_SIZE]; 17744f20980SStefan Hajnoczi EXPORT_SYMBOL_GPL(vsock_connected_table); 17844f20980SStefan Hajnoczi DEFINE_SPINLOCK(vsock_table_lock); 17944f20980SStefan Hajnoczi EXPORT_SYMBOL_GPL(vsock_table_lock); 180d021c344SAndy King 181b3a6dfe8SAsias He /* Autobind this socket to the local address if necessary. */ 182b3a6dfe8SAsias He static int vsock_auto_bind(struct vsock_sock *vsk) 183b3a6dfe8SAsias He { 184b3a6dfe8SAsias He struct sock *sk = sk_vsock(vsk); 185b3a6dfe8SAsias He struct sockaddr_vm local_addr; 186b3a6dfe8SAsias He 187b3a6dfe8SAsias He if (vsock_addr_bound(&vsk->local_addr)) 188b3a6dfe8SAsias He return 0; 189b3a6dfe8SAsias He vsock_addr_init(&local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); 190b3a6dfe8SAsias He return __vsock_bind(sk, &local_addr); 191b3a6dfe8SAsias He } 192b3a6dfe8SAsias He 193c0cfa2d8SStefano Garzarella static void vsock_init_tables(void) 194d021c344SAndy King { 195d021c344SAndy King int i; 196d021c344SAndy King 197d021c344SAndy King for (i = 0; i < ARRAY_SIZE(vsock_bind_table); i++) 198d021c344SAndy King INIT_LIST_HEAD(&vsock_bind_table[i]); 199d021c344SAndy King 200d021c344SAndy King for (i = 0; i < ARRAY_SIZE(vsock_connected_table); i++) 201d021c344SAndy King INIT_LIST_HEAD(&vsock_connected_table[i]); 202d021c344SAndy King } 203d021c344SAndy King 204d021c344SAndy King static void __vsock_insert_bound(struct list_head *list, 205d021c344SAndy King struct vsock_sock *vsk) 206d021c344SAndy King { 207d021c344SAndy King sock_hold(&vsk->sk); 208d021c344SAndy King list_add(&vsk->bound_table, list); 209d021c344SAndy King } 210d021c344SAndy King 211d021c344SAndy King static void __vsock_insert_connected(struct list_head *list, 212d021c344SAndy King struct vsock_sock *vsk) 213d021c344SAndy King { 214d021c344SAndy King sock_hold(&vsk->sk); 215d021c344SAndy King list_add(&vsk->connected_table, list); 216d021c344SAndy King } 217d021c344SAndy King 218d021c344SAndy King static void __vsock_remove_bound(struct vsock_sock *vsk) 219d021c344SAndy King { 220d021c344SAndy King list_del_init(&vsk->bound_table); 221d021c344SAndy King sock_put(&vsk->sk); 222d021c344SAndy King } 223d021c344SAndy King 224d021c344SAndy King static void __vsock_remove_connected(struct vsock_sock *vsk) 225d021c344SAndy King { 226d021c344SAndy King list_del_init(&vsk->connected_table); 227d021c344SAndy King sock_put(&vsk->sk); 228d021c344SAndy King } 229d021c344SAndy King 230d021c344SAndy King static struct sock *__vsock_find_bound_socket(struct sockaddr_vm *addr) 231d021c344SAndy King { 232d021c344SAndy King struct vsock_sock *vsk; 233d021c344SAndy King 23436c5b48bSStefano Garzarella list_for_each_entry(vsk, vsock_bound_sockets(addr), bound_table) { 23536c5b48bSStefano Garzarella if (vsock_addr_equals_addr(addr, &vsk->local_addr)) 236d021c344SAndy King return sk_vsock(vsk); 237d021c344SAndy King 23836c5b48bSStefano Garzarella if (addr->svm_port == vsk->local_addr.svm_port && 23936c5b48bSStefano Garzarella (vsk->local_addr.svm_cid == VMADDR_CID_ANY || 24036c5b48bSStefano Garzarella addr->svm_cid == VMADDR_CID_ANY)) 24136c5b48bSStefano Garzarella return sk_vsock(vsk); 24236c5b48bSStefano Garzarella } 24336c5b48bSStefano Garzarella 244d021c344SAndy King return NULL; 245d021c344SAndy King } 246d021c344SAndy King 247d021c344SAndy King static struct sock *__vsock_find_connected_socket(struct sockaddr_vm *src, 248d021c344SAndy King struct sockaddr_vm *dst) 249d021c344SAndy King { 250d021c344SAndy King struct vsock_sock *vsk; 251d021c344SAndy King 252d021c344SAndy King list_for_each_entry(vsk, vsock_connected_sockets(src, dst), 253d021c344SAndy King connected_table) { 254990454b5SReilly Grant if (vsock_addr_equals_addr(src, &vsk->remote_addr) && 255990454b5SReilly Grant dst->svm_port == vsk->local_addr.svm_port) { 256d021c344SAndy King return sk_vsock(vsk); 257d021c344SAndy King } 258d021c344SAndy King } 259d021c344SAndy King 260d021c344SAndy King return NULL; 261d021c344SAndy King } 262d021c344SAndy King 263d021c344SAndy King static void vsock_insert_unbound(struct vsock_sock *vsk) 264d021c344SAndy King { 265d021c344SAndy King spin_lock_bh(&vsock_table_lock); 266d021c344SAndy King __vsock_insert_bound(vsock_unbound_sockets, vsk); 267d021c344SAndy King spin_unlock_bh(&vsock_table_lock); 268d021c344SAndy King } 269d021c344SAndy King 270d021c344SAndy King void vsock_insert_connected(struct vsock_sock *vsk) 271d021c344SAndy King { 272d021c344SAndy King struct list_head *list = vsock_connected_sockets( 273d021c344SAndy King &vsk->remote_addr, &vsk->local_addr); 274d021c344SAndy King 275d021c344SAndy King spin_lock_bh(&vsock_table_lock); 276d021c344SAndy King __vsock_insert_connected(list, vsk); 277d021c344SAndy King spin_unlock_bh(&vsock_table_lock); 278d021c344SAndy King } 279d021c344SAndy King EXPORT_SYMBOL_GPL(vsock_insert_connected); 280d021c344SAndy King 281d021c344SAndy King void vsock_remove_bound(struct vsock_sock *vsk) 282d021c344SAndy King { 283d021c344SAndy King spin_lock_bh(&vsock_table_lock); 284d5afa82cSSunil Muthuswamy if (__vsock_in_bound_table(vsk)) 285d021c344SAndy King __vsock_remove_bound(vsk); 286d021c344SAndy King spin_unlock_bh(&vsock_table_lock); 287d021c344SAndy King } 288d021c344SAndy King EXPORT_SYMBOL_GPL(vsock_remove_bound); 289d021c344SAndy King 290d021c344SAndy King void vsock_remove_connected(struct vsock_sock *vsk) 291d021c344SAndy King { 292d021c344SAndy King spin_lock_bh(&vsock_table_lock); 293d5afa82cSSunil Muthuswamy if (__vsock_in_connected_table(vsk)) 294d021c344SAndy King __vsock_remove_connected(vsk); 295d021c344SAndy King spin_unlock_bh(&vsock_table_lock); 296d021c344SAndy King } 297d021c344SAndy King EXPORT_SYMBOL_GPL(vsock_remove_connected); 298d021c344SAndy King 299d021c344SAndy King struct sock *vsock_find_bound_socket(struct sockaddr_vm *addr) 300d021c344SAndy King { 301d021c344SAndy King struct sock *sk; 302d021c344SAndy King 303d021c344SAndy King spin_lock_bh(&vsock_table_lock); 304d021c344SAndy King sk = __vsock_find_bound_socket(addr); 305d021c344SAndy King if (sk) 306d021c344SAndy King sock_hold(sk); 307d021c344SAndy King 308d021c344SAndy King spin_unlock_bh(&vsock_table_lock); 309d021c344SAndy King 310d021c344SAndy King return sk; 311d021c344SAndy King } 312d021c344SAndy King EXPORT_SYMBOL_GPL(vsock_find_bound_socket); 313d021c344SAndy King 314d021c344SAndy King struct sock *vsock_find_connected_socket(struct sockaddr_vm *src, 315d021c344SAndy King struct sockaddr_vm *dst) 316d021c344SAndy King { 317d021c344SAndy King struct sock *sk; 318d021c344SAndy King 319d021c344SAndy King spin_lock_bh(&vsock_table_lock); 320d021c344SAndy King sk = __vsock_find_connected_socket(src, dst); 321d021c344SAndy King if (sk) 322d021c344SAndy King sock_hold(sk); 323d021c344SAndy King 324d021c344SAndy King spin_unlock_bh(&vsock_table_lock); 325d021c344SAndy King 326d021c344SAndy King return sk; 327d021c344SAndy King } 328d021c344SAndy King EXPORT_SYMBOL_GPL(vsock_find_connected_socket); 329d021c344SAndy King 3306773b7dcSStefan Hajnoczi void vsock_remove_sock(struct vsock_sock *vsk) 3316773b7dcSStefan Hajnoczi { 3326773b7dcSStefan Hajnoczi vsock_remove_bound(vsk); 3336773b7dcSStefan Hajnoczi vsock_remove_connected(vsk); 3346773b7dcSStefan Hajnoczi } 3356773b7dcSStefan Hajnoczi EXPORT_SYMBOL_GPL(vsock_remove_sock); 3366773b7dcSStefan Hajnoczi 337d021c344SAndy King void vsock_for_each_connected_socket(void (*fn)(struct sock *sk)) 338d021c344SAndy King { 339d021c344SAndy King int i; 340d021c344SAndy King 341d021c344SAndy King spin_lock_bh(&vsock_table_lock); 342d021c344SAndy King 343d021c344SAndy King for (i = 0; i < ARRAY_SIZE(vsock_connected_table); i++) { 344d021c344SAndy King struct vsock_sock *vsk; 345d021c344SAndy King list_for_each_entry(vsk, &vsock_connected_table[i], 346d9af2d67SJulia Lawall connected_table) 347d021c344SAndy King fn(sk_vsock(vsk)); 348d021c344SAndy King } 349d021c344SAndy King 350d021c344SAndy King spin_unlock_bh(&vsock_table_lock); 351d021c344SAndy King } 352d021c344SAndy King EXPORT_SYMBOL_GPL(vsock_for_each_connected_socket); 353d021c344SAndy King 354d021c344SAndy King void vsock_add_pending(struct sock *listener, struct sock *pending) 355d021c344SAndy King { 356d021c344SAndy King struct vsock_sock *vlistener; 357d021c344SAndy King struct vsock_sock *vpending; 358d021c344SAndy King 359d021c344SAndy King vlistener = vsock_sk(listener); 360d021c344SAndy King vpending = vsock_sk(pending); 361d021c344SAndy King 362d021c344SAndy King sock_hold(pending); 363d021c344SAndy King sock_hold(listener); 364d021c344SAndy King list_add_tail(&vpending->pending_links, &vlistener->pending_links); 365d021c344SAndy King } 366d021c344SAndy King EXPORT_SYMBOL_GPL(vsock_add_pending); 367d021c344SAndy King 368d021c344SAndy King void vsock_remove_pending(struct sock *listener, struct sock *pending) 369d021c344SAndy King { 370d021c344SAndy King struct vsock_sock *vpending = vsock_sk(pending); 371d021c344SAndy King 372d021c344SAndy King list_del_init(&vpending->pending_links); 373d021c344SAndy King sock_put(listener); 374d021c344SAndy King sock_put(pending); 375d021c344SAndy King } 376d021c344SAndy King EXPORT_SYMBOL_GPL(vsock_remove_pending); 377d021c344SAndy King 378d021c344SAndy King void vsock_enqueue_accept(struct sock *listener, struct sock *connected) 379d021c344SAndy King { 380d021c344SAndy King struct vsock_sock *vlistener; 381d021c344SAndy King struct vsock_sock *vconnected; 382d021c344SAndy King 383d021c344SAndy King vlistener = vsock_sk(listener); 384d021c344SAndy King vconnected = vsock_sk(connected); 385d021c344SAndy King 386d021c344SAndy King sock_hold(connected); 387d021c344SAndy King sock_hold(listener); 388d021c344SAndy King list_add_tail(&vconnected->accept_queue, &vlistener->accept_queue); 389d021c344SAndy King } 390d021c344SAndy King EXPORT_SYMBOL_GPL(vsock_enqueue_accept); 391d021c344SAndy King 392408624afSStefano Garzarella static bool vsock_use_local_transport(unsigned int remote_cid) 393408624afSStefano Garzarella { 394408624afSStefano Garzarella if (!transport_local) 395408624afSStefano Garzarella return false; 396408624afSStefano Garzarella 397408624afSStefano Garzarella if (remote_cid == VMADDR_CID_LOCAL) 398408624afSStefano Garzarella return true; 399408624afSStefano Garzarella 400408624afSStefano Garzarella if (transport_g2h) { 401408624afSStefano Garzarella return remote_cid == transport_g2h->get_local_cid(); 402408624afSStefano Garzarella } else { 403408624afSStefano Garzarella return remote_cid == VMADDR_CID_HOST; 404408624afSStefano Garzarella } 405408624afSStefano Garzarella } 406408624afSStefano Garzarella 4076a2c0962SStefano Garzarella static void vsock_deassign_transport(struct vsock_sock *vsk) 4086a2c0962SStefano Garzarella { 4096a2c0962SStefano Garzarella if (!vsk->transport) 4106a2c0962SStefano Garzarella return; 4116a2c0962SStefano Garzarella 4126a2c0962SStefano Garzarella vsk->transport->destruct(vsk); 4136a2c0962SStefano Garzarella module_put(vsk->transport->module); 4146a2c0962SStefano Garzarella vsk->transport = NULL; 4156a2c0962SStefano Garzarella } 4166a2c0962SStefano Garzarella 417c0cfa2d8SStefano Garzarella /* Assign a transport to a socket and call the .init transport callback. 418c0cfa2d8SStefano Garzarella * 4198cb48554SArseny Krasnov * Note: for connection oriented socket this must be called when vsk->remote_addr 4208cb48554SArseny Krasnov * is set (e.g. during the connect() or when a connection request on a listener 421c0cfa2d8SStefano Garzarella * socket is received). 422c0cfa2d8SStefano Garzarella * The vsk->remote_addr is used to decide which transport to use: 423408624afSStefano Garzarella * - remote CID == VMADDR_CID_LOCAL or g2h->local_cid or VMADDR_CID_HOST if 424408624afSStefano Garzarella * g2h is not loaded, will use local transport; 4257f816984SAndra Paraschiv * - remote CID <= VMADDR_CID_HOST or h2g is not loaded or remote flags field 4267f816984SAndra Paraschiv * includes VMADDR_FLAG_TO_HOST flag value, will use guest->host transport; 427c0cfa2d8SStefano Garzarella * - remote CID > VMADDR_CID_HOST will use host->guest transport; 428c0cfa2d8SStefano Garzarella */ 429c0cfa2d8SStefano Garzarella int vsock_assign_transport(struct vsock_sock *vsk, struct vsock_sock *psk) 430c0cfa2d8SStefano Garzarella { 431c0cfa2d8SStefano Garzarella const struct vsock_transport *new_transport; 432c0cfa2d8SStefano Garzarella struct sock *sk = sk_vsock(vsk); 433c0cfa2d8SStefano Garzarella unsigned int remote_cid = vsk->remote_addr.svm_cid; 4347f816984SAndra Paraschiv __u8 remote_flags; 435039fcccaSStefano Garzarella int ret; 436c0cfa2d8SStefano Garzarella 4371b5f2ab9SAndra Paraschiv /* If the packet is coming with the source and destination CIDs higher 4381b5f2ab9SAndra Paraschiv * than VMADDR_CID_HOST, then a vsock channel where all the packets are 4391b5f2ab9SAndra Paraschiv * forwarded to the host should be established. Then the host will 4401b5f2ab9SAndra Paraschiv * need to forward the packets to the guest. 4411b5f2ab9SAndra Paraschiv * 4421b5f2ab9SAndra Paraschiv * The flag is set on the (listen) receive path (psk is not NULL). On 4431b5f2ab9SAndra Paraschiv * the connect path the flag can be set by the user space application. 4441b5f2ab9SAndra Paraschiv */ 4451b5f2ab9SAndra Paraschiv if (psk && vsk->local_addr.svm_cid > VMADDR_CID_HOST && 4461b5f2ab9SAndra Paraschiv vsk->remote_addr.svm_cid > VMADDR_CID_HOST) 4471b5f2ab9SAndra Paraschiv vsk->remote_addr.svm_flags |= VMADDR_FLAG_TO_HOST; 4481b5f2ab9SAndra Paraschiv 4497f816984SAndra Paraschiv remote_flags = vsk->remote_addr.svm_flags; 4507f816984SAndra Paraschiv 451c0cfa2d8SStefano Garzarella switch (sk->sk_type) { 452c0cfa2d8SStefano Garzarella case SOCK_DGRAM: 453c0cfa2d8SStefano Garzarella new_transport = transport_dgram; 454c0cfa2d8SStefano Garzarella break; 455c0cfa2d8SStefano Garzarella case SOCK_STREAM: 4560798e78bSArseny Krasnov case SOCK_SEQPACKET: 457408624afSStefano Garzarella if (vsock_use_local_transport(remote_cid)) 458408624afSStefano Garzarella new_transport = transport_local; 4597f816984SAndra Paraschiv else if (remote_cid <= VMADDR_CID_HOST || !transport_h2g || 4607f816984SAndra Paraschiv (remote_flags & VMADDR_FLAG_TO_HOST)) 461c0cfa2d8SStefano Garzarella new_transport = transport_g2h; 462c0cfa2d8SStefano Garzarella else 463c0cfa2d8SStefano Garzarella new_transport = transport_h2g; 464c0cfa2d8SStefano Garzarella break; 465c0cfa2d8SStefano Garzarella default: 466c0cfa2d8SStefano Garzarella return -ESOCKTNOSUPPORT; 467c0cfa2d8SStefano Garzarella } 468c0cfa2d8SStefano Garzarella 469c0cfa2d8SStefano Garzarella if (vsk->transport) { 470c0cfa2d8SStefano Garzarella if (vsk->transport == new_transport) 471c0cfa2d8SStefano Garzarella return 0; 472c0cfa2d8SStefano Garzarella 4733f74957fSStefano Garzarella /* transport->release() must be called with sock lock acquired. 4748cb48554SArseny Krasnov * This path can only be taken during vsock_connect(), where we 4758cb48554SArseny Krasnov * have already held the sock lock. In the other cases, this 4768cb48554SArseny Krasnov * function is called on a new socket which is not assigned to 4778cb48554SArseny Krasnov * any transport. 4783f74957fSStefano Garzarella */ 479c0cfa2d8SStefano Garzarella vsk->transport->release(vsk); 4806a2c0962SStefano Garzarella vsock_deassign_transport(vsk); 481c0cfa2d8SStefano Garzarella } 482c0cfa2d8SStefano Garzarella 4836a2c0962SStefano Garzarella /* We increase the module refcnt to prevent the transport unloading 4846a2c0962SStefano Garzarella * while there are open sockets assigned to it. 4856a2c0962SStefano Garzarella */ 4866a2c0962SStefano Garzarella if (!new_transport || !try_module_get(new_transport->module)) 487c0cfa2d8SStefano Garzarella return -ENODEV; 488c0cfa2d8SStefano Garzarella 4890798e78bSArseny Krasnov if (sk->sk_type == SOCK_SEQPACKET) { 4900798e78bSArseny Krasnov if (!new_transport->seqpacket_allow || 4910798e78bSArseny Krasnov !new_transport->seqpacket_allow(remote_cid)) { 4920798e78bSArseny Krasnov module_put(new_transport->module); 4930798e78bSArseny Krasnov return -ESOCKTNOSUPPORT; 4940798e78bSArseny Krasnov } 4950798e78bSArseny Krasnov } 4960798e78bSArseny Krasnov 497039fcccaSStefano Garzarella ret = new_transport->init(vsk, psk); 498039fcccaSStefano Garzarella if (ret) { 499039fcccaSStefano Garzarella module_put(new_transport->module); 500039fcccaSStefano Garzarella return ret; 501039fcccaSStefano Garzarella } 502039fcccaSStefano Garzarella 503c0cfa2d8SStefano Garzarella vsk->transport = new_transport; 504c0cfa2d8SStefano Garzarella 505039fcccaSStefano Garzarella return 0; 506c0cfa2d8SStefano Garzarella } 507c0cfa2d8SStefano Garzarella EXPORT_SYMBOL_GPL(vsock_assign_transport); 508c0cfa2d8SStefano Garzarella 509c0cfa2d8SStefano Garzarella bool vsock_find_cid(unsigned int cid) 510c0cfa2d8SStefano Garzarella { 511c0cfa2d8SStefano Garzarella if (transport_g2h && cid == transport_g2h->get_local_cid()) 512c0cfa2d8SStefano Garzarella return true; 513c0cfa2d8SStefano Garzarella 514c0cfa2d8SStefano Garzarella if (transport_h2g && cid == VMADDR_CID_HOST) 515c0cfa2d8SStefano Garzarella return true; 516c0cfa2d8SStefano Garzarella 517408624afSStefano Garzarella if (transport_local && cid == VMADDR_CID_LOCAL) 518408624afSStefano Garzarella return true; 519408624afSStefano Garzarella 520c0cfa2d8SStefano Garzarella return false; 521c0cfa2d8SStefano Garzarella } 522c0cfa2d8SStefano Garzarella EXPORT_SYMBOL_GPL(vsock_find_cid); 523c0cfa2d8SStefano Garzarella 524d021c344SAndy King static struct sock *vsock_dequeue_accept(struct sock *listener) 525d021c344SAndy King { 526d021c344SAndy King struct vsock_sock *vlistener; 527d021c344SAndy King struct vsock_sock *vconnected; 528d021c344SAndy King 529d021c344SAndy King vlistener = vsock_sk(listener); 530d021c344SAndy King 531d021c344SAndy King if (list_empty(&vlistener->accept_queue)) 532d021c344SAndy King return NULL; 533d021c344SAndy King 534d021c344SAndy King vconnected = list_entry(vlistener->accept_queue.next, 535d021c344SAndy King struct vsock_sock, accept_queue); 536d021c344SAndy King 537d021c344SAndy King list_del_init(&vconnected->accept_queue); 538d021c344SAndy King sock_put(listener); 539d021c344SAndy King /* The caller will need a reference on the connected socket so we let 540d021c344SAndy King * it call sock_put(). 541d021c344SAndy King */ 542d021c344SAndy King 543d021c344SAndy King return sk_vsock(vconnected); 544d021c344SAndy King } 545d021c344SAndy King 546d021c344SAndy King static bool vsock_is_accept_queue_empty(struct sock *sk) 547d021c344SAndy King { 548d021c344SAndy King struct vsock_sock *vsk = vsock_sk(sk); 549d021c344SAndy King return list_empty(&vsk->accept_queue); 550d021c344SAndy King } 551d021c344SAndy King 552d021c344SAndy King static bool vsock_is_pending(struct sock *sk) 553d021c344SAndy King { 554d021c344SAndy King struct vsock_sock *vsk = vsock_sk(sk); 555d021c344SAndy King return !list_empty(&vsk->pending_links); 556d021c344SAndy King } 557d021c344SAndy King 558d021c344SAndy King static int vsock_send_shutdown(struct sock *sk, int mode) 559d021c344SAndy King { 560fe502c4aSStefano Garzarella struct vsock_sock *vsk = vsock_sk(sk); 561fe502c4aSStefano Garzarella 562c0cfa2d8SStefano Garzarella if (!vsk->transport) 563c0cfa2d8SStefano Garzarella return -ENODEV; 564c0cfa2d8SStefano Garzarella 565fe502c4aSStefano Garzarella return vsk->transport->shutdown(vsk, mode); 566d021c344SAndy King } 567d021c344SAndy King 568455f05ecSCong Wang static void vsock_pending_work(struct work_struct *work) 569d021c344SAndy King { 570d021c344SAndy King struct sock *sk; 571d021c344SAndy King struct sock *listener; 572d021c344SAndy King struct vsock_sock *vsk; 573d021c344SAndy King bool cleanup; 574d021c344SAndy King 575455f05ecSCong Wang vsk = container_of(work, struct vsock_sock, pending_work.work); 576d021c344SAndy King sk = sk_vsock(vsk); 577d021c344SAndy King listener = vsk->listener; 578d021c344SAndy King cleanup = true; 579d021c344SAndy King 580d021c344SAndy King lock_sock(listener); 5814192f672SStefan Hajnoczi lock_sock_nested(sk, SINGLE_DEPTH_NESTING); 582d021c344SAndy King 583d021c344SAndy King if (vsock_is_pending(sk)) { 584d021c344SAndy King vsock_remove_pending(listener, sk); 5851190cfdbSJorgen Hansen 5867976a11bSEric Dumazet sk_acceptq_removed(listener); 587d021c344SAndy King } else if (!vsk->rejected) { 588d021c344SAndy King /* We are not on the pending list and accept() did not reject 589d021c344SAndy King * us, so we must have been accepted by our user process. We 590d021c344SAndy King * just need to drop our references to the sockets and be on 591d021c344SAndy King * our way. 592d021c344SAndy King */ 593d021c344SAndy King cleanup = false; 594d021c344SAndy King goto out; 595d021c344SAndy King } 596d021c344SAndy King 597d021c344SAndy King /* We need to remove ourself from the global connected sockets list so 598d021c344SAndy King * incoming packets can't find this socket, and to reduce the reference 599d021c344SAndy King * count. 600d021c344SAndy King */ 601d021c344SAndy King vsock_remove_connected(vsk); 602d021c344SAndy King 6033b4477d2SStefan Hajnoczi sk->sk_state = TCP_CLOSE; 604d021c344SAndy King 605d021c344SAndy King out: 606d021c344SAndy King release_sock(sk); 607d021c344SAndy King release_sock(listener); 608d021c344SAndy King if (cleanup) 609d021c344SAndy King sock_put(sk); 610d021c344SAndy King 611d021c344SAndy King sock_put(sk); 612d021c344SAndy King sock_put(listener); 613d021c344SAndy King } 614d021c344SAndy King 615d021c344SAndy King /**** SOCKET OPERATIONS ****/ 616d021c344SAndy King 617a9e29e55SArseny Krasnov static int __vsock_bind_connectible(struct vsock_sock *vsk, 618d021c344SAndy King struct sockaddr_vm *addr) 619d021c344SAndy King { 620a22d3251SLepton Wu static u32 port; 621d021c344SAndy King struct sockaddr_vm new_addr; 622d021c344SAndy King 6238236b08cSLepton Wu if (!port) 6248236b08cSLepton Wu port = LAST_RESERVED_PORT + 1 + 6258236b08cSLepton Wu prandom_u32_max(U32_MAX - LAST_RESERVED_PORT); 6268236b08cSLepton Wu 627d021c344SAndy King vsock_addr_init(&new_addr, addr->svm_cid, addr->svm_port); 628d021c344SAndy King 629d021c344SAndy King if (addr->svm_port == VMADDR_PORT_ANY) { 630d021c344SAndy King bool found = false; 631d021c344SAndy King unsigned int i; 632d021c344SAndy King 633d021c344SAndy King for (i = 0; i < MAX_PORT_RETRIES; i++) { 634d021c344SAndy King if (port <= LAST_RESERVED_PORT) 635d021c344SAndy King port = LAST_RESERVED_PORT + 1; 636d021c344SAndy King 637d021c344SAndy King new_addr.svm_port = port++; 638d021c344SAndy King 639d021c344SAndy King if (!__vsock_find_bound_socket(&new_addr)) { 640d021c344SAndy King found = true; 641d021c344SAndy King break; 642d021c344SAndy King } 643d021c344SAndy King } 644d021c344SAndy King 645d021c344SAndy King if (!found) 646d021c344SAndy King return -EADDRNOTAVAIL; 647d021c344SAndy King } else { 648d021c344SAndy King /* If port is in reserved range, ensure caller 649d021c344SAndy King * has necessary privileges. 650d021c344SAndy King */ 651d021c344SAndy King if (addr->svm_port <= LAST_RESERVED_PORT && 652d021c344SAndy King !capable(CAP_NET_BIND_SERVICE)) { 653d021c344SAndy King return -EACCES; 654d021c344SAndy King } 655d021c344SAndy King 656d021c344SAndy King if (__vsock_find_bound_socket(&new_addr)) 657d021c344SAndy King return -EADDRINUSE; 658d021c344SAndy King } 659d021c344SAndy King 660d021c344SAndy King vsock_addr_init(&vsk->local_addr, new_addr.svm_cid, new_addr.svm_port); 661d021c344SAndy King 6628cb48554SArseny Krasnov /* Remove connection oriented sockets from the unbound list and add them 6638cb48554SArseny Krasnov * to the hash table for easy lookup by its address. The unbound list 6648cb48554SArseny Krasnov * is simply an extra entry at the end of the hash table, a trick used 6658cb48554SArseny Krasnov * by AF_UNIX. 666d021c344SAndy King */ 667d021c344SAndy King __vsock_remove_bound(vsk); 668d021c344SAndy King __vsock_insert_bound(vsock_bound_sockets(&vsk->local_addr), vsk); 669d021c344SAndy King 670d021c344SAndy King return 0; 671d021c344SAndy King } 672d021c344SAndy King 673d021c344SAndy King static int __vsock_bind_dgram(struct vsock_sock *vsk, 674d021c344SAndy King struct sockaddr_vm *addr) 675d021c344SAndy King { 676fe502c4aSStefano Garzarella return vsk->transport->dgram_bind(vsk, addr); 677d021c344SAndy King } 678d021c344SAndy King 679d021c344SAndy King static int __vsock_bind(struct sock *sk, struct sockaddr_vm *addr) 680d021c344SAndy King { 681d021c344SAndy King struct vsock_sock *vsk = vsock_sk(sk); 682d021c344SAndy King int retval; 683d021c344SAndy King 684d021c344SAndy King /* First ensure this socket isn't already bound. */ 685d021c344SAndy King if (vsock_addr_bound(&vsk->local_addr)) 686d021c344SAndy King return -EINVAL; 687d021c344SAndy King 688d021c344SAndy King /* Now bind to the provided address or select appropriate values if 689d021c344SAndy King * none are provided (VMADDR_CID_ANY and VMADDR_PORT_ANY). Note that 690d021c344SAndy King * like AF_INET prevents binding to a non-local IP address (in most 691c0cfa2d8SStefano Garzarella * cases), we only allow binding to a local CID. 692d021c344SAndy King */ 693c0cfa2d8SStefano Garzarella if (addr->svm_cid != VMADDR_CID_ANY && !vsock_find_cid(addr->svm_cid)) 694d021c344SAndy King return -EADDRNOTAVAIL; 695d021c344SAndy King 696d021c344SAndy King switch (sk->sk_socket->type) { 697d021c344SAndy King case SOCK_STREAM: 6980798e78bSArseny Krasnov case SOCK_SEQPACKET: 699d021c344SAndy King spin_lock_bh(&vsock_table_lock); 700a9e29e55SArseny Krasnov retval = __vsock_bind_connectible(vsk, addr); 701d021c344SAndy King spin_unlock_bh(&vsock_table_lock); 702d021c344SAndy King break; 703d021c344SAndy King 704d021c344SAndy King case SOCK_DGRAM: 705d021c344SAndy King retval = __vsock_bind_dgram(vsk, addr); 706d021c344SAndy King break; 707d021c344SAndy King 708d021c344SAndy King default: 709d021c344SAndy King retval = -EINVAL; 710d021c344SAndy King break; 711d021c344SAndy King } 712d021c344SAndy King 713d021c344SAndy King return retval; 714d021c344SAndy King } 715d021c344SAndy King 716455f05ecSCong Wang static void vsock_connect_timeout(struct work_struct *work); 717455f05ecSCong Wang 718b9ca2f5fSStefano Garzarella static struct sock *__vsock_create(struct net *net, 719d021c344SAndy King struct socket *sock, 720d021c344SAndy King struct sock *parent, 721d021c344SAndy King gfp_t priority, 72211aa9c28SEric W. Biederman unsigned short type, 72311aa9c28SEric W. Biederman int kern) 724d021c344SAndy King { 725d021c344SAndy King struct sock *sk; 726d021c344SAndy King struct vsock_sock *psk; 727d021c344SAndy King struct vsock_sock *vsk; 728d021c344SAndy King 72911aa9c28SEric W. Biederman sk = sk_alloc(net, AF_VSOCK, priority, &vsock_proto, kern); 730d021c344SAndy King if (!sk) 731d021c344SAndy King return NULL; 732d021c344SAndy King 733d021c344SAndy King sock_init_data(sock, sk); 734d021c344SAndy King 735d021c344SAndy King /* sk->sk_type is normally set in sock_init_data, but only if sock is 736d021c344SAndy King * non-NULL. We make sure that our sockets always have a type by 737d021c344SAndy King * setting it here if needed. 738d021c344SAndy King */ 739d021c344SAndy King if (!sock) 740d021c344SAndy King sk->sk_type = type; 741d021c344SAndy King 742d021c344SAndy King vsk = vsock_sk(sk); 743d021c344SAndy King vsock_addr_init(&vsk->local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); 744d021c344SAndy King vsock_addr_init(&vsk->remote_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); 745d021c344SAndy King 746d021c344SAndy King sk->sk_destruct = vsock_sk_destruct; 747d021c344SAndy King sk->sk_backlog_rcv = vsock_queue_rcv_skb; 748d021c344SAndy King sock_reset_flag(sk, SOCK_DONE); 749d021c344SAndy King 750d021c344SAndy King INIT_LIST_HEAD(&vsk->bound_table); 751d021c344SAndy King INIT_LIST_HEAD(&vsk->connected_table); 752d021c344SAndy King vsk->listener = NULL; 753d021c344SAndy King INIT_LIST_HEAD(&vsk->pending_links); 754d021c344SAndy King INIT_LIST_HEAD(&vsk->accept_queue); 755d021c344SAndy King vsk->rejected = false; 756d021c344SAndy King vsk->sent_request = false; 757d021c344SAndy King vsk->ignore_connecting_rst = false; 758d021c344SAndy King vsk->peer_shutdown = 0; 759455f05ecSCong Wang INIT_DELAYED_WORK(&vsk->connect_work, vsock_connect_timeout); 760455f05ecSCong Wang INIT_DELAYED_WORK(&vsk->pending_work, vsock_pending_work); 761d021c344SAndy King 762d021c344SAndy King psk = parent ? vsock_sk(parent) : NULL; 763d021c344SAndy King if (parent) { 764d021c344SAndy King vsk->trusted = psk->trusted; 765d021c344SAndy King vsk->owner = get_cred(psk->owner); 766d021c344SAndy King vsk->connect_timeout = psk->connect_timeout; 767b9f2b0ffSStefano Garzarella vsk->buffer_size = psk->buffer_size; 768b9f2b0ffSStefano Garzarella vsk->buffer_min_size = psk->buffer_min_size; 769b9f2b0ffSStefano Garzarella vsk->buffer_max_size = psk->buffer_max_size; 7701f935e8eSDavid Brazdil security_sk_clone(parent, sk); 771d021c344SAndy King } else { 772af545bb5SJeff Vander Stoep vsk->trusted = ns_capable_noaudit(&init_user_ns, CAP_NET_ADMIN); 773d021c344SAndy King vsk->owner = get_current_cred(); 774d021c344SAndy King vsk->connect_timeout = VSOCK_DEFAULT_CONNECT_TIMEOUT; 775b9f2b0ffSStefano Garzarella vsk->buffer_size = VSOCK_DEFAULT_BUFFER_SIZE; 776b9f2b0ffSStefano Garzarella vsk->buffer_min_size = VSOCK_DEFAULT_BUFFER_MIN_SIZE; 777b9f2b0ffSStefano Garzarella vsk->buffer_max_size = VSOCK_DEFAULT_BUFFER_MAX_SIZE; 778d021c344SAndy King } 779d021c344SAndy King 780d021c344SAndy King return sk; 781d021c344SAndy King } 782d021c344SAndy King 783a9e29e55SArseny Krasnov static bool sock_type_connectible(u16 type) 784a9e29e55SArseny Krasnov { 7850798e78bSArseny Krasnov return (type == SOCK_STREAM) || (type == SOCK_SEQPACKET); 786a9e29e55SArseny Krasnov } 787a9e29e55SArseny Krasnov 7880d9138ffSDexuan Cui static void __vsock_release(struct sock *sk, int level) 789d021c344SAndy King { 790d021c344SAndy King if (sk) { 791d021c344SAndy King struct sock *pending; 792d021c344SAndy King struct vsock_sock *vsk; 793d021c344SAndy King 794d021c344SAndy King vsk = vsock_sk(sk); 795d021c344SAndy King pending = NULL; /* Compiler warning. */ 796d021c344SAndy King 7970d9138ffSDexuan Cui /* When "level" is SINGLE_DEPTH_NESTING, use the nested 7980d9138ffSDexuan Cui * version to avoid the warning "possible recursive locking 7990d9138ffSDexuan Cui * detected". When "level" is 0, lock_sock_nested(sk, level) 8000d9138ffSDexuan Cui * is the same as lock_sock(sk). 8010d9138ffSDexuan Cui */ 8020d9138ffSDexuan Cui lock_sock_nested(sk, level); 8033f74957fSStefano Garzarella 8043f74957fSStefano Garzarella if (vsk->transport) 8053f74957fSStefano Garzarella vsk->transport->release(vsk); 806a9e29e55SArseny Krasnov else if (sock_type_connectible(sk->sk_type)) 8073f74957fSStefano Garzarella vsock_remove_sock(vsk); 8083f74957fSStefano Garzarella 809d021c344SAndy King sock_orphan(sk); 810d021c344SAndy King sk->sk_shutdown = SHUTDOWN_MASK; 811d021c344SAndy King 8123b7ad08bSChristophe JAILLET skb_queue_purge(&sk->sk_receive_queue); 813d021c344SAndy King 814d021c344SAndy King /* Clean up any sockets that never were accepted. */ 815d021c344SAndy King while ((pending = vsock_dequeue_accept(sk)) != NULL) { 8160d9138ffSDexuan Cui __vsock_release(pending, SINGLE_DEPTH_NESTING); 817d021c344SAndy King sock_put(pending); 818d021c344SAndy King } 819d021c344SAndy King 820d021c344SAndy King release_sock(sk); 821d021c344SAndy King sock_put(sk); 822d021c344SAndy King } 823d021c344SAndy King } 824d021c344SAndy King 825d021c344SAndy King static void vsock_sk_destruct(struct sock *sk) 826d021c344SAndy King { 827d021c344SAndy King struct vsock_sock *vsk = vsock_sk(sk); 828d021c344SAndy King 8296a2c0962SStefano Garzarella vsock_deassign_transport(vsk); 830d021c344SAndy King 831d021c344SAndy King /* When clearing these addresses, there's no need to set the family and 832d021c344SAndy King * possibly register the address family with the kernel. 833d021c344SAndy King */ 834d021c344SAndy King vsock_addr_init(&vsk->local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); 835d021c344SAndy King vsock_addr_init(&vsk->remote_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); 836d021c344SAndy King 837d021c344SAndy King put_cred(vsk->owner); 838d021c344SAndy King } 839d021c344SAndy King 840d021c344SAndy King static int vsock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 841d021c344SAndy King { 842d021c344SAndy King int err; 843d021c344SAndy King 844d021c344SAndy King err = sock_queue_rcv_skb(sk, skb); 845d021c344SAndy King if (err) 846d021c344SAndy King kfree_skb(skb); 847d021c344SAndy King 848d021c344SAndy King return err; 849d021c344SAndy King } 850d021c344SAndy King 851b9ca2f5fSStefano Garzarella struct sock *vsock_create_connected(struct sock *parent) 852b9ca2f5fSStefano Garzarella { 853b9ca2f5fSStefano Garzarella return __vsock_create(sock_net(parent), NULL, parent, GFP_KERNEL, 854b9ca2f5fSStefano Garzarella parent->sk_type, 0); 855b9ca2f5fSStefano Garzarella } 856b9ca2f5fSStefano Garzarella EXPORT_SYMBOL_GPL(vsock_create_connected); 857b9ca2f5fSStefano Garzarella 858d021c344SAndy King s64 vsock_stream_has_data(struct vsock_sock *vsk) 859d021c344SAndy King { 860fe502c4aSStefano Garzarella return vsk->transport->stream_has_data(vsk); 861d021c344SAndy King } 862d021c344SAndy King EXPORT_SYMBOL_GPL(vsock_stream_has_data); 863d021c344SAndy King 864cc97141aSStefano Garzarella static s64 vsock_connectible_has_data(struct vsock_sock *vsk) 8650798e78bSArseny Krasnov { 8660798e78bSArseny Krasnov struct sock *sk = sk_vsock(vsk); 8670798e78bSArseny Krasnov 8680798e78bSArseny Krasnov if (sk->sk_type == SOCK_SEQPACKET) 8690798e78bSArseny Krasnov return vsk->transport->seqpacket_has_data(vsk); 8700798e78bSArseny Krasnov else 8710798e78bSArseny Krasnov return vsock_stream_has_data(vsk); 8720798e78bSArseny Krasnov } 8730798e78bSArseny Krasnov 874d021c344SAndy King s64 vsock_stream_has_space(struct vsock_sock *vsk) 875d021c344SAndy King { 876fe502c4aSStefano Garzarella return vsk->transport->stream_has_space(vsk); 877d021c344SAndy King } 878d021c344SAndy King EXPORT_SYMBOL_GPL(vsock_stream_has_space); 879d021c344SAndy King 880d021c344SAndy King static int vsock_release(struct socket *sock) 881d021c344SAndy King { 8820d9138ffSDexuan Cui __vsock_release(sock->sk, 0); 883d021c344SAndy King sock->sk = NULL; 884d021c344SAndy King sock->state = SS_FREE; 885d021c344SAndy King 886d021c344SAndy King return 0; 887d021c344SAndy King } 888d021c344SAndy King 889d021c344SAndy King static int 890d021c344SAndy King vsock_bind(struct socket *sock, struct sockaddr *addr, int addr_len) 891d021c344SAndy King { 892d021c344SAndy King int err; 893d021c344SAndy King struct sock *sk; 894d021c344SAndy King struct sockaddr_vm *vm_addr; 895d021c344SAndy King 896d021c344SAndy King sk = sock->sk; 897d021c344SAndy King 898d021c344SAndy King if (vsock_addr_cast(addr, addr_len, &vm_addr) != 0) 899d021c344SAndy King return -EINVAL; 900d021c344SAndy King 901d021c344SAndy King lock_sock(sk); 902d021c344SAndy King err = __vsock_bind(sk, vm_addr); 903d021c344SAndy King release_sock(sk); 904d021c344SAndy King 905d021c344SAndy King return err; 906d021c344SAndy King } 907d021c344SAndy King 908d021c344SAndy King static int vsock_getname(struct socket *sock, 9099b2c45d4SDenys Vlasenko struct sockaddr *addr, int peer) 910d021c344SAndy King { 911d021c344SAndy King int err; 912d021c344SAndy King struct sock *sk; 913d021c344SAndy King struct vsock_sock *vsk; 914d021c344SAndy King struct sockaddr_vm *vm_addr; 915d021c344SAndy King 916d021c344SAndy King sk = sock->sk; 917d021c344SAndy King vsk = vsock_sk(sk); 918d021c344SAndy King err = 0; 919d021c344SAndy King 920d021c344SAndy King lock_sock(sk); 921d021c344SAndy King 922d021c344SAndy King if (peer) { 923d021c344SAndy King if (sock->state != SS_CONNECTED) { 924d021c344SAndy King err = -ENOTCONN; 925d021c344SAndy King goto out; 926d021c344SAndy King } 927d021c344SAndy King vm_addr = &vsk->remote_addr; 928d021c344SAndy King } else { 929d021c344SAndy King vm_addr = &vsk->local_addr; 930d021c344SAndy King } 931d021c344SAndy King 932d021c344SAndy King if (!vm_addr) { 933d021c344SAndy King err = -EINVAL; 934d021c344SAndy King goto out; 935d021c344SAndy King } 936d021c344SAndy King 937d021c344SAndy King /* sys_getsockname() and sys_getpeername() pass us a 938d021c344SAndy King * MAX_SOCK_ADDR-sized buffer and don't set addr_len. Unfortunately 939d021c344SAndy King * that macro is defined in socket.c instead of .h, so we hardcode its 940d021c344SAndy King * value here. 941d021c344SAndy King */ 942d021c344SAndy King BUILD_BUG_ON(sizeof(*vm_addr) > 128); 943d021c344SAndy King memcpy(addr, vm_addr, sizeof(*vm_addr)); 9449b2c45d4SDenys Vlasenko err = sizeof(*vm_addr); 945d021c344SAndy King 946d021c344SAndy King out: 947d021c344SAndy King release_sock(sk); 948d021c344SAndy King return err; 949d021c344SAndy King } 950d021c344SAndy King 951d021c344SAndy King static int vsock_shutdown(struct socket *sock, int mode) 952d021c344SAndy King { 953d021c344SAndy King int err; 954d021c344SAndy King struct sock *sk; 955d021c344SAndy King 956d021c344SAndy King /* User level uses SHUT_RD (0) and SHUT_WR (1), but the kernel uses 957d021c344SAndy King * RCV_SHUTDOWN (1) and SEND_SHUTDOWN (2), so we must increment mode 958d021c344SAndy King * here like the other address families do. Note also that the 959d021c344SAndy King * increment makes SHUT_RDWR (2) into RCV_SHUTDOWN | SEND_SHUTDOWN (3), 960d021c344SAndy King * which is what we want. 961d021c344SAndy King */ 962d021c344SAndy King mode++; 963d021c344SAndy King 964d021c344SAndy King if ((mode & ~SHUTDOWN_MASK) || !mode) 965d021c344SAndy King return -EINVAL; 966d021c344SAndy King 9678cb48554SArseny Krasnov /* If this is a connection oriented socket and it is not connected then 9688cb48554SArseny Krasnov * bail out immediately. If it is a DGRAM socket then we must first 9698cb48554SArseny Krasnov * kick the socket so that it wakes up from any sleeping calls, for 9708cb48554SArseny Krasnov * example recv(), and then afterwards return the error. 971d021c344SAndy King */ 972d021c344SAndy King 973d021c344SAndy King sk = sock->sk; 9741c5fae9cSStefano Garzarella 9751c5fae9cSStefano Garzarella lock_sock(sk); 976d021c344SAndy King if (sock->state == SS_UNCONNECTED) { 977d021c344SAndy King err = -ENOTCONN; 978a9e29e55SArseny Krasnov if (sock_type_connectible(sk->sk_type)) 9791c5fae9cSStefano Garzarella goto out; 980d021c344SAndy King } else { 981d021c344SAndy King sock->state = SS_DISCONNECTING; 982d021c344SAndy King err = 0; 983d021c344SAndy King } 984d021c344SAndy King 985d021c344SAndy King /* Receive and send shutdowns are treated alike. */ 986d021c344SAndy King mode = mode & (RCV_SHUTDOWN | SEND_SHUTDOWN); 987d021c344SAndy King if (mode) { 988d021c344SAndy King sk->sk_shutdown |= mode; 989d021c344SAndy King sk->sk_state_change(sk); 990d021c344SAndy King 991a9e29e55SArseny Krasnov if (sock_type_connectible(sk->sk_type)) { 992d021c344SAndy King sock_reset_flag(sk, SOCK_DONE); 993d021c344SAndy King vsock_send_shutdown(sk, mode); 994d021c344SAndy King } 995d021c344SAndy King } 996d021c344SAndy King 9971c5fae9cSStefano Garzarella out: 9981c5fae9cSStefano Garzarella release_sock(sk); 999d021c344SAndy King return err; 1000d021c344SAndy King } 1001d021c344SAndy King 1002a11e1d43SLinus Torvalds static __poll_t vsock_poll(struct file *file, struct socket *sock, 1003a11e1d43SLinus Torvalds poll_table *wait) 1004d021c344SAndy King { 1005a11e1d43SLinus Torvalds struct sock *sk; 1006a11e1d43SLinus Torvalds __poll_t mask; 1007a11e1d43SLinus Torvalds struct vsock_sock *vsk; 1008a11e1d43SLinus Torvalds 1009a11e1d43SLinus Torvalds sk = sock->sk; 1010a11e1d43SLinus Torvalds vsk = vsock_sk(sk); 1011a11e1d43SLinus Torvalds 1012a11e1d43SLinus Torvalds poll_wait(file, sk_sleep(sk), wait); 1013a11e1d43SLinus Torvalds mask = 0; 1014d021c344SAndy King 1015d021c344SAndy King if (sk->sk_err) 1016d021c344SAndy King /* Signify that there has been an error on this socket. */ 1017a9a08845SLinus Torvalds mask |= EPOLLERR; 1018d021c344SAndy King 1019d021c344SAndy King /* INET sockets treat local write shutdown and peer write shutdown as a 1020a9a08845SLinus Torvalds * case of EPOLLHUP set. 1021d021c344SAndy King */ 1022d021c344SAndy King if ((sk->sk_shutdown == SHUTDOWN_MASK) || 1023d021c344SAndy King ((sk->sk_shutdown & SEND_SHUTDOWN) && 1024d021c344SAndy King (vsk->peer_shutdown & SEND_SHUTDOWN))) { 1025a9a08845SLinus Torvalds mask |= EPOLLHUP; 1026d021c344SAndy King } 1027d021c344SAndy King 1028d021c344SAndy King if (sk->sk_shutdown & RCV_SHUTDOWN || 1029d021c344SAndy King vsk->peer_shutdown & SEND_SHUTDOWN) { 1030a9a08845SLinus Torvalds mask |= EPOLLRDHUP; 1031d021c344SAndy King } 1032d021c344SAndy King 1033d021c344SAndy King if (sock->type == SOCK_DGRAM) { 1034d021c344SAndy King /* For datagram sockets we can read if there is something in 1035d021c344SAndy King * the queue and write as long as the socket isn't shutdown for 1036d021c344SAndy King * sending. 1037d021c344SAndy King */ 10383ef7cf57SEric Dumazet if (!skb_queue_empty_lockless(&sk->sk_receive_queue) || 1039d021c344SAndy King (sk->sk_shutdown & RCV_SHUTDOWN)) { 1040a9a08845SLinus Torvalds mask |= EPOLLIN | EPOLLRDNORM; 1041d021c344SAndy King } 1042d021c344SAndy King 1043d021c344SAndy King if (!(sk->sk_shutdown & SEND_SHUTDOWN)) 1044a9a08845SLinus Torvalds mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND; 1045d021c344SAndy King 1046a9e29e55SArseny Krasnov } else if (sock_type_connectible(sk->sk_type)) { 1047c518adafSAlexander Popov const struct vsock_transport *transport; 1048c518adafSAlexander Popov 1049d021c344SAndy King lock_sock(sk); 1050d021c344SAndy King 1051c518adafSAlexander Popov transport = vsk->transport; 1052c518adafSAlexander Popov 1053d021c344SAndy King /* Listening sockets that have connections in their accept 1054d021c344SAndy King * queue can be read. 1055d021c344SAndy King */ 10563b4477d2SStefan Hajnoczi if (sk->sk_state == TCP_LISTEN 1057d021c344SAndy King && !vsock_is_accept_queue_empty(sk)) 1058a9a08845SLinus Torvalds mask |= EPOLLIN | EPOLLRDNORM; 1059d021c344SAndy King 1060d021c344SAndy King /* If there is something in the queue then we can read. */ 1061c0cfa2d8SStefano Garzarella if (transport && transport->stream_is_active(vsk) && 1062d021c344SAndy King !(sk->sk_shutdown & RCV_SHUTDOWN)) { 1063d021c344SAndy King bool data_ready_now = false; 1064d021c344SAndy King int ret = transport->notify_poll_in( 1065d021c344SAndy King vsk, 1, &data_ready_now); 1066d021c344SAndy King if (ret < 0) { 1067a9a08845SLinus Torvalds mask |= EPOLLERR; 1068d021c344SAndy King } else { 1069d021c344SAndy King if (data_ready_now) 1070a9a08845SLinus Torvalds mask |= EPOLLIN | EPOLLRDNORM; 1071d021c344SAndy King 1072d021c344SAndy King } 1073d021c344SAndy King } 1074d021c344SAndy King 1075d021c344SAndy King /* Sockets whose connections have been closed, reset, or 1076d021c344SAndy King * terminated should also be considered read, and we check the 1077d021c344SAndy King * shutdown flag for that. 1078d021c344SAndy King */ 1079d021c344SAndy King if (sk->sk_shutdown & RCV_SHUTDOWN || 1080d021c344SAndy King vsk->peer_shutdown & SEND_SHUTDOWN) { 1081a9a08845SLinus Torvalds mask |= EPOLLIN | EPOLLRDNORM; 1082d021c344SAndy King } 1083d021c344SAndy King 1084d021c344SAndy King /* Connected sockets that can produce data can be written. */ 10851980c058SStefano Garzarella if (transport && sk->sk_state == TCP_ESTABLISHED) { 1086d021c344SAndy King if (!(sk->sk_shutdown & SEND_SHUTDOWN)) { 1087d021c344SAndy King bool space_avail_now = false; 1088d021c344SAndy King int ret = transport->notify_poll_out( 1089d021c344SAndy King vsk, 1, &space_avail_now); 1090d021c344SAndy King if (ret < 0) { 1091a9a08845SLinus Torvalds mask |= EPOLLERR; 1092d021c344SAndy King } else { 1093d021c344SAndy King if (space_avail_now) 1094a9a08845SLinus Torvalds /* Remove EPOLLWRBAND since INET 1095d021c344SAndy King * sockets are not setting it. 1096d021c344SAndy King */ 1097a9a08845SLinus Torvalds mask |= EPOLLOUT | EPOLLWRNORM; 1098d021c344SAndy King 1099d021c344SAndy King } 1100d021c344SAndy King } 1101d021c344SAndy King } 1102d021c344SAndy King 1103d021c344SAndy King /* Simulate INET socket poll behaviors, which sets 1104a9a08845SLinus Torvalds * EPOLLOUT|EPOLLWRNORM when peer is closed and nothing to read, 1105d021c344SAndy King * but local send is not shutdown. 1106d021c344SAndy King */ 1107ba3169fcSStefan Hajnoczi if (sk->sk_state == TCP_CLOSE || sk->sk_state == TCP_CLOSING) { 1108d021c344SAndy King if (!(sk->sk_shutdown & SEND_SHUTDOWN)) 1109a9a08845SLinus Torvalds mask |= EPOLLOUT | EPOLLWRNORM; 1110d021c344SAndy King 1111d021c344SAndy King } 1112d021c344SAndy King 1113d021c344SAndy King release_sock(sk); 1114d021c344SAndy King } 1115d021c344SAndy King 1116d021c344SAndy King return mask; 1117d021c344SAndy King } 1118d021c344SAndy King 11191b784140SYing Xue static int vsock_dgram_sendmsg(struct socket *sock, struct msghdr *msg, 11201b784140SYing Xue size_t len) 1121d021c344SAndy King { 1122d021c344SAndy King int err; 1123d021c344SAndy King struct sock *sk; 1124d021c344SAndy King struct vsock_sock *vsk; 1125d021c344SAndy King struct sockaddr_vm *remote_addr; 1126fe502c4aSStefano Garzarella const struct vsock_transport *transport; 1127d021c344SAndy King 1128d021c344SAndy King if (msg->msg_flags & MSG_OOB) 1129d021c344SAndy King return -EOPNOTSUPP; 1130d021c344SAndy King 1131d021c344SAndy King /* For now, MSG_DONTWAIT is always assumed... */ 1132d021c344SAndy King err = 0; 1133d021c344SAndy King sk = sock->sk; 1134d021c344SAndy King vsk = vsock_sk(sk); 1135d021c344SAndy King 1136d021c344SAndy King lock_sock(sk); 1137d021c344SAndy King 1138c518adafSAlexander Popov transport = vsk->transport; 1139c518adafSAlexander Popov 1140b3a6dfe8SAsias He err = vsock_auto_bind(vsk); 1141b3a6dfe8SAsias He if (err) 1142d021c344SAndy King goto out; 1143d021c344SAndy King 1144d021c344SAndy King 1145d021c344SAndy King /* If the provided message contains an address, use that. Otherwise 1146d021c344SAndy King * fall back on the socket's remote handle (if it has been connected). 1147d021c344SAndy King */ 1148d021c344SAndy King if (msg->msg_name && 1149d021c344SAndy King vsock_addr_cast(msg->msg_name, msg->msg_namelen, 1150d021c344SAndy King &remote_addr) == 0) { 1151d021c344SAndy King /* Ensure this address is of the right type and is a valid 1152d021c344SAndy King * destination. 1153d021c344SAndy King */ 1154d021c344SAndy King 1155d021c344SAndy King if (remote_addr->svm_cid == VMADDR_CID_ANY) 1156d021c344SAndy King remote_addr->svm_cid = transport->get_local_cid(); 1157d021c344SAndy King 1158d021c344SAndy King if (!vsock_addr_bound(remote_addr)) { 1159d021c344SAndy King err = -EINVAL; 1160d021c344SAndy King goto out; 1161d021c344SAndy King } 1162d021c344SAndy King } else if (sock->state == SS_CONNECTED) { 1163d021c344SAndy King remote_addr = &vsk->remote_addr; 1164d021c344SAndy King 1165d021c344SAndy King if (remote_addr->svm_cid == VMADDR_CID_ANY) 1166d021c344SAndy King remote_addr->svm_cid = transport->get_local_cid(); 1167d021c344SAndy King 1168d021c344SAndy King /* XXX Should connect() or this function ensure remote_addr is 1169d021c344SAndy King * bound? 1170d021c344SAndy King */ 1171d021c344SAndy King if (!vsock_addr_bound(&vsk->remote_addr)) { 1172d021c344SAndy King err = -EINVAL; 1173d021c344SAndy King goto out; 1174d021c344SAndy King } 1175d021c344SAndy King } else { 1176d021c344SAndy King err = -EINVAL; 1177d021c344SAndy King goto out; 1178d021c344SAndy King } 1179d021c344SAndy King 1180d021c344SAndy King if (!transport->dgram_allow(remote_addr->svm_cid, 1181d021c344SAndy King remote_addr->svm_port)) { 1182d021c344SAndy King err = -EINVAL; 1183d021c344SAndy King goto out; 1184d021c344SAndy King } 1185d021c344SAndy King 11860f7db23aSAl Viro err = transport->dgram_enqueue(vsk, remote_addr, msg, len); 1187d021c344SAndy King 1188d021c344SAndy King out: 1189d021c344SAndy King release_sock(sk); 1190d021c344SAndy King return err; 1191d021c344SAndy King } 1192d021c344SAndy King 1193d021c344SAndy King static int vsock_dgram_connect(struct socket *sock, 1194d021c344SAndy King struct sockaddr *addr, int addr_len, int flags) 1195d021c344SAndy King { 1196d021c344SAndy King int err; 1197d021c344SAndy King struct sock *sk; 1198d021c344SAndy King struct vsock_sock *vsk; 1199d021c344SAndy King struct sockaddr_vm *remote_addr; 1200d021c344SAndy King 1201d021c344SAndy King sk = sock->sk; 1202d021c344SAndy King vsk = vsock_sk(sk); 1203d021c344SAndy King 1204d021c344SAndy King err = vsock_addr_cast(addr, addr_len, &remote_addr); 1205d021c344SAndy King if (err == -EAFNOSUPPORT && remote_addr->svm_family == AF_UNSPEC) { 1206d021c344SAndy King lock_sock(sk); 1207d021c344SAndy King vsock_addr_init(&vsk->remote_addr, VMADDR_CID_ANY, 1208d021c344SAndy King VMADDR_PORT_ANY); 1209d021c344SAndy King sock->state = SS_UNCONNECTED; 1210d021c344SAndy King release_sock(sk); 1211d021c344SAndy King return 0; 1212d021c344SAndy King } else if (err != 0) 1213d021c344SAndy King return -EINVAL; 1214d021c344SAndy King 1215d021c344SAndy King lock_sock(sk); 1216d021c344SAndy King 1217b3a6dfe8SAsias He err = vsock_auto_bind(vsk); 1218b3a6dfe8SAsias He if (err) 1219d021c344SAndy King goto out; 1220d021c344SAndy King 1221fe502c4aSStefano Garzarella if (!vsk->transport->dgram_allow(remote_addr->svm_cid, 1222d021c344SAndy King remote_addr->svm_port)) { 1223d021c344SAndy King err = -EINVAL; 1224d021c344SAndy King goto out; 1225d021c344SAndy King } 1226d021c344SAndy King 1227d021c344SAndy King memcpy(&vsk->remote_addr, remote_addr, sizeof(vsk->remote_addr)); 1228d021c344SAndy King sock->state = SS_CONNECTED; 1229d021c344SAndy King 1230d021c344SAndy King out: 1231d021c344SAndy King release_sock(sk); 1232d021c344SAndy King return err; 1233d021c344SAndy King } 1234d021c344SAndy King 12351b784140SYing Xue static int vsock_dgram_recvmsg(struct socket *sock, struct msghdr *msg, 12361b784140SYing Xue size_t len, int flags) 1237d021c344SAndy King { 1238fe502c4aSStefano Garzarella struct vsock_sock *vsk = vsock_sk(sock->sk); 1239fe502c4aSStefano Garzarella 1240fe502c4aSStefano Garzarella return vsk->transport->dgram_dequeue(vsk, msg, len, flags); 1241d021c344SAndy King } 1242d021c344SAndy King 1243d021c344SAndy King static const struct proto_ops vsock_dgram_ops = { 1244d021c344SAndy King .family = PF_VSOCK, 1245d021c344SAndy King .owner = THIS_MODULE, 1246d021c344SAndy King .release = vsock_release, 1247d021c344SAndy King .bind = vsock_bind, 1248d021c344SAndy King .connect = vsock_dgram_connect, 1249d021c344SAndy King .socketpair = sock_no_socketpair, 1250d021c344SAndy King .accept = sock_no_accept, 1251d021c344SAndy King .getname = vsock_getname, 1252a11e1d43SLinus Torvalds .poll = vsock_poll, 1253d021c344SAndy King .ioctl = sock_no_ioctl, 1254d021c344SAndy King .listen = sock_no_listen, 1255d021c344SAndy King .shutdown = vsock_shutdown, 1256d021c344SAndy King .sendmsg = vsock_dgram_sendmsg, 1257d021c344SAndy King .recvmsg = vsock_dgram_recvmsg, 1258d021c344SAndy King .mmap = sock_no_mmap, 1259d021c344SAndy King .sendpage = sock_no_sendpage, 1260d021c344SAndy King }; 1261d021c344SAndy King 1262380feae0SPeng Tao static int vsock_transport_cancel_pkt(struct vsock_sock *vsk) 1263380feae0SPeng Tao { 1264fe502c4aSStefano Garzarella const struct vsock_transport *transport = vsk->transport; 1265fe502c4aSStefano Garzarella 12665d1cbcc9SNorbert Slusarek if (!transport || !transport->cancel_pkt) 1267380feae0SPeng Tao return -EOPNOTSUPP; 1268380feae0SPeng Tao 1269380feae0SPeng Tao return transport->cancel_pkt(vsk); 1270380feae0SPeng Tao } 1271380feae0SPeng Tao 1272d021c344SAndy King static void vsock_connect_timeout(struct work_struct *work) 1273d021c344SAndy King { 1274d021c344SAndy King struct sock *sk; 1275d021c344SAndy King struct vsock_sock *vsk; 1276d021c344SAndy King 1277455f05ecSCong Wang vsk = container_of(work, struct vsock_sock, connect_work.work); 1278d021c344SAndy King sk = sk_vsock(vsk); 1279d021c344SAndy King 1280d021c344SAndy King lock_sock(sk); 12813b4477d2SStefan Hajnoczi if (sk->sk_state == TCP_SYN_SENT && 1282d021c344SAndy King (sk->sk_shutdown != SHUTDOWN_MASK)) { 12833b4477d2SStefan Hajnoczi sk->sk_state = TCP_CLOSE; 1284d021c344SAndy King sk->sk_err = ETIMEDOUT; 1285e3ae2365SAlexander Aring sk_error_report(sk); 12863d0bc44dSNorbert Slusarek vsock_transport_cancel_pkt(vsk); 1287d021c344SAndy King } 1288d021c344SAndy King release_sock(sk); 1289d021c344SAndy King 1290d021c344SAndy King sock_put(sk); 1291d021c344SAndy King } 1292d021c344SAndy King 1293a9e29e55SArseny Krasnov static int vsock_connect(struct socket *sock, struct sockaddr *addr, 1294d021c344SAndy King int addr_len, int flags) 1295d021c344SAndy King { 1296d021c344SAndy King int err; 1297d021c344SAndy King struct sock *sk; 1298d021c344SAndy King struct vsock_sock *vsk; 1299fe502c4aSStefano Garzarella const struct vsock_transport *transport; 1300d021c344SAndy King struct sockaddr_vm *remote_addr; 1301d021c344SAndy King long timeout; 1302d021c344SAndy King DEFINE_WAIT(wait); 1303d021c344SAndy King 1304d021c344SAndy King err = 0; 1305d021c344SAndy King sk = sock->sk; 1306d021c344SAndy King vsk = vsock_sk(sk); 1307d021c344SAndy King 1308d021c344SAndy King lock_sock(sk); 1309d021c344SAndy King 1310d021c344SAndy King /* XXX AF_UNSPEC should make us disconnect like AF_INET. */ 1311d021c344SAndy King switch (sock->state) { 1312d021c344SAndy King case SS_CONNECTED: 1313d021c344SAndy King err = -EISCONN; 1314d021c344SAndy King goto out; 1315d021c344SAndy King case SS_DISCONNECTING: 1316d021c344SAndy King err = -EINVAL; 1317d021c344SAndy King goto out; 1318d021c344SAndy King case SS_CONNECTING: 1319d021c344SAndy King /* This continues on so we can move sock into the SS_CONNECTED 1320d021c344SAndy King * state once the connection has completed (at which point err 1321d021c344SAndy King * will be set to zero also). Otherwise, we will either wait 1322d021c344SAndy King * for the connection or return -EALREADY should this be a 1323d021c344SAndy King * non-blocking call. 1324d021c344SAndy King */ 1325d021c344SAndy King err = -EALREADY; 1326c7cd82b9SEiichi Tsukata if (flags & O_NONBLOCK) 1327c7cd82b9SEiichi Tsukata goto out; 1328d021c344SAndy King break; 1329d021c344SAndy King default: 13303b4477d2SStefan Hajnoczi if ((sk->sk_state == TCP_LISTEN) || 1331d021c344SAndy King vsock_addr_cast(addr, addr_len, &remote_addr) != 0) { 1332d021c344SAndy King err = -EINVAL; 1333d021c344SAndy King goto out; 1334d021c344SAndy King } 1335d021c344SAndy King 1336c0cfa2d8SStefano Garzarella /* Set the remote address that we are connecting to. */ 1337c0cfa2d8SStefano Garzarella memcpy(&vsk->remote_addr, remote_addr, 1338c0cfa2d8SStefano Garzarella sizeof(vsk->remote_addr)); 1339c0cfa2d8SStefano Garzarella 1340c0cfa2d8SStefano Garzarella err = vsock_assign_transport(vsk, NULL); 1341c0cfa2d8SStefano Garzarella if (err) 1342c0cfa2d8SStefano Garzarella goto out; 1343c0cfa2d8SStefano Garzarella 1344c0cfa2d8SStefano Garzarella transport = vsk->transport; 1345c0cfa2d8SStefano Garzarella 1346d021c344SAndy King /* The hypervisor and well-known contexts do not have socket 1347d021c344SAndy King * endpoints. 1348d021c344SAndy King */ 1349c0cfa2d8SStefano Garzarella if (!transport || 1350c0cfa2d8SStefano Garzarella !transport->stream_allow(remote_addr->svm_cid, 1351d021c344SAndy King remote_addr->svm_port)) { 1352d021c344SAndy King err = -ENETUNREACH; 1353d021c344SAndy King goto out; 1354d021c344SAndy King } 1355d021c344SAndy King 1356b3a6dfe8SAsias He err = vsock_auto_bind(vsk); 1357b3a6dfe8SAsias He if (err) 1358d021c344SAndy King goto out; 1359d021c344SAndy King 13603b4477d2SStefan Hajnoczi sk->sk_state = TCP_SYN_SENT; 1361d021c344SAndy King 1362d021c344SAndy King err = transport->connect(vsk); 1363d021c344SAndy King if (err < 0) 1364d021c344SAndy King goto out; 1365d021c344SAndy King 1366d021c344SAndy King /* Mark sock as connecting and set the error code to in 1367d021c344SAndy King * progress in case this is a non-blocking connect. 1368d021c344SAndy King */ 1369d021c344SAndy King sock->state = SS_CONNECTING; 1370d021c344SAndy King err = -EINPROGRESS; 1371d021c344SAndy King } 1372d021c344SAndy King 1373d021c344SAndy King /* The receive path will handle all communication until we are able to 1374d021c344SAndy King * enter the connected state. Here we wait for the connection to be 1375d021c344SAndy King * completed or a notification of an error. 1376d021c344SAndy King */ 1377d021c344SAndy King timeout = vsk->connect_timeout; 1378d021c344SAndy King prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 1379d021c344SAndy King 13803b4477d2SStefan Hajnoczi while (sk->sk_state != TCP_ESTABLISHED && sk->sk_err == 0) { 1381d021c344SAndy King if (flags & O_NONBLOCK) { 1382d021c344SAndy King /* If we're not going to block, we schedule a timeout 1383d021c344SAndy King * function to generate a timeout on the connection 1384d021c344SAndy King * attempt, in case the peer doesn't respond in a 1385d021c344SAndy King * timely manner. We hold on to the socket until the 1386d021c344SAndy King * timeout fires. 1387d021c344SAndy King */ 1388d021c344SAndy King sock_hold(sk); 1389455f05ecSCong Wang schedule_delayed_work(&vsk->connect_work, timeout); 1390d021c344SAndy King 1391d021c344SAndy King /* Skip ahead to preserve error code set above. */ 1392d021c344SAndy King goto out_wait; 1393d021c344SAndy King } 1394d021c344SAndy King 1395d021c344SAndy King release_sock(sk); 1396d021c344SAndy King timeout = schedule_timeout(timeout); 1397d021c344SAndy King lock_sock(sk); 1398d021c344SAndy King 1399d021c344SAndy King if (signal_pending(current)) { 1400d021c344SAndy King err = sock_intr_errno(timeout); 1401c7ff9cffSLongpeng(Mike) sk->sk_state = sk->sk_state == TCP_ESTABLISHED ? TCP_CLOSING : TCP_CLOSE; 1402f7f9b5e7SClaudio Imbrenda sock->state = SS_UNCONNECTED; 1403380feae0SPeng Tao vsock_transport_cancel_pkt(vsk); 1404*b9208492SSeth Forshee vsock_remove_connected(vsk); 1405f7f9b5e7SClaudio Imbrenda goto out_wait; 1406d021c344SAndy King } else if (timeout == 0) { 1407d021c344SAndy King err = -ETIMEDOUT; 14083b4477d2SStefan Hajnoczi sk->sk_state = TCP_CLOSE; 1409f7f9b5e7SClaudio Imbrenda sock->state = SS_UNCONNECTED; 1410380feae0SPeng Tao vsock_transport_cancel_pkt(vsk); 1411f7f9b5e7SClaudio Imbrenda goto out_wait; 1412d021c344SAndy King } 1413d021c344SAndy King 1414d021c344SAndy King prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 1415d021c344SAndy King } 1416d021c344SAndy King 1417d021c344SAndy King if (sk->sk_err) { 1418d021c344SAndy King err = -sk->sk_err; 14193b4477d2SStefan Hajnoczi sk->sk_state = TCP_CLOSE; 1420f7f9b5e7SClaudio Imbrenda sock->state = SS_UNCONNECTED; 1421f7f9b5e7SClaudio Imbrenda } else { 1422d021c344SAndy King err = 0; 1423f7f9b5e7SClaudio Imbrenda } 1424d021c344SAndy King 1425d021c344SAndy King out_wait: 1426d021c344SAndy King finish_wait(sk_sleep(sk), &wait); 1427d021c344SAndy King out: 1428d021c344SAndy King release_sock(sk); 1429d021c344SAndy King return err; 1430d021c344SAndy King } 1431d021c344SAndy King 1432cdfbabfbSDavid Howells static int vsock_accept(struct socket *sock, struct socket *newsock, int flags, 1433cdfbabfbSDavid Howells bool kern) 1434d021c344SAndy King { 1435d021c344SAndy King struct sock *listener; 1436d021c344SAndy King int err; 1437d021c344SAndy King struct sock *connected; 1438d021c344SAndy King struct vsock_sock *vconnected; 1439d021c344SAndy King long timeout; 1440d021c344SAndy King DEFINE_WAIT(wait); 1441d021c344SAndy King 1442d021c344SAndy King err = 0; 1443d021c344SAndy King listener = sock->sk; 1444d021c344SAndy King 1445d021c344SAndy King lock_sock(listener); 1446d021c344SAndy King 1447a9e29e55SArseny Krasnov if (!sock_type_connectible(sock->type)) { 1448d021c344SAndy King err = -EOPNOTSUPP; 1449d021c344SAndy King goto out; 1450d021c344SAndy King } 1451d021c344SAndy King 14523b4477d2SStefan Hajnoczi if (listener->sk_state != TCP_LISTEN) { 1453d021c344SAndy King err = -EINVAL; 1454d021c344SAndy King goto out; 1455d021c344SAndy King } 1456d021c344SAndy King 1457d021c344SAndy King /* Wait for children sockets to appear; these are the new sockets 1458d021c344SAndy King * created upon connection establishment. 1459d021c344SAndy King */ 14607e0afbdfSStefano Garzarella timeout = sock_rcvtimeo(listener, flags & O_NONBLOCK); 1461d021c344SAndy King prepare_to_wait(sk_sleep(listener), &wait, TASK_INTERRUPTIBLE); 1462d021c344SAndy King 1463d021c344SAndy King while ((connected = vsock_dequeue_accept(listener)) == NULL && 1464d021c344SAndy King listener->sk_err == 0) { 1465d021c344SAndy King release_sock(listener); 1466d021c344SAndy King timeout = schedule_timeout(timeout); 1467f7f9b5e7SClaudio Imbrenda finish_wait(sk_sleep(listener), &wait); 1468d021c344SAndy King lock_sock(listener); 1469d021c344SAndy King 1470d021c344SAndy King if (signal_pending(current)) { 1471d021c344SAndy King err = sock_intr_errno(timeout); 1472f7f9b5e7SClaudio Imbrenda goto out; 1473d021c344SAndy King } else if (timeout == 0) { 1474d021c344SAndy King err = -EAGAIN; 1475f7f9b5e7SClaudio Imbrenda goto out; 1476d021c344SAndy King } 1477d021c344SAndy King 1478d021c344SAndy King prepare_to_wait(sk_sleep(listener), &wait, TASK_INTERRUPTIBLE); 1479d021c344SAndy King } 1480f7f9b5e7SClaudio Imbrenda finish_wait(sk_sleep(listener), &wait); 1481d021c344SAndy King 1482d021c344SAndy King if (listener->sk_err) 1483d021c344SAndy King err = -listener->sk_err; 1484d021c344SAndy King 1485d021c344SAndy King if (connected) { 14867976a11bSEric Dumazet sk_acceptq_removed(listener); 1487d021c344SAndy King 14884192f672SStefan Hajnoczi lock_sock_nested(connected, SINGLE_DEPTH_NESTING); 1489d021c344SAndy King vconnected = vsock_sk(connected); 1490d021c344SAndy King 1491d021c344SAndy King /* If the listener socket has received an error, then we should 1492d021c344SAndy King * reject this socket and return. Note that we simply mark the 1493d021c344SAndy King * socket rejected, drop our reference, and let the cleanup 1494d021c344SAndy King * function handle the cleanup; the fact that we found it in 1495d021c344SAndy King * the listener's accept queue guarantees that the cleanup 1496d021c344SAndy King * function hasn't run yet. 1497d021c344SAndy King */ 1498d021c344SAndy King if (err) { 1499d021c344SAndy King vconnected->rejected = true; 1500f7f9b5e7SClaudio Imbrenda } else { 1501d021c344SAndy King newsock->state = SS_CONNECTED; 1502d021c344SAndy King sock_graft(connected, newsock); 1503f7f9b5e7SClaudio Imbrenda } 1504f7f9b5e7SClaudio Imbrenda 1505d021c344SAndy King release_sock(connected); 1506d021c344SAndy King sock_put(connected); 1507d021c344SAndy King } 1508d021c344SAndy King 1509d021c344SAndy King out: 1510d021c344SAndy King release_sock(listener); 1511d021c344SAndy King return err; 1512d021c344SAndy King } 1513d021c344SAndy King 1514d021c344SAndy King static int vsock_listen(struct socket *sock, int backlog) 1515d021c344SAndy King { 1516d021c344SAndy King int err; 1517d021c344SAndy King struct sock *sk; 1518d021c344SAndy King struct vsock_sock *vsk; 1519d021c344SAndy King 1520d021c344SAndy King sk = sock->sk; 1521d021c344SAndy King 1522d021c344SAndy King lock_sock(sk); 1523d021c344SAndy King 1524a9e29e55SArseny Krasnov if (!sock_type_connectible(sk->sk_type)) { 1525d021c344SAndy King err = -EOPNOTSUPP; 1526d021c344SAndy King goto out; 1527d021c344SAndy King } 1528d021c344SAndy King 1529d021c344SAndy King if (sock->state != SS_UNCONNECTED) { 1530d021c344SAndy King err = -EINVAL; 1531d021c344SAndy King goto out; 1532d021c344SAndy King } 1533d021c344SAndy King 1534d021c344SAndy King vsk = vsock_sk(sk); 1535d021c344SAndy King 1536d021c344SAndy King if (!vsock_addr_bound(&vsk->local_addr)) { 1537d021c344SAndy King err = -EINVAL; 1538d021c344SAndy King goto out; 1539d021c344SAndy King } 1540d021c344SAndy King 1541d021c344SAndy King sk->sk_max_ack_backlog = backlog; 15423b4477d2SStefan Hajnoczi sk->sk_state = TCP_LISTEN; 1543d021c344SAndy King 1544d021c344SAndy King err = 0; 1545d021c344SAndy King 1546d021c344SAndy King out: 1547d021c344SAndy King release_sock(sk); 1548d021c344SAndy King return err; 1549d021c344SAndy King } 1550d021c344SAndy King 1551b9f2b0ffSStefano Garzarella static void vsock_update_buffer_size(struct vsock_sock *vsk, 1552b9f2b0ffSStefano Garzarella const struct vsock_transport *transport, 1553b9f2b0ffSStefano Garzarella u64 val) 1554b9f2b0ffSStefano Garzarella { 1555b9f2b0ffSStefano Garzarella if (val > vsk->buffer_max_size) 1556b9f2b0ffSStefano Garzarella val = vsk->buffer_max_size; 1557b9f2b0ffSStefano Garzarella 1558b9f2b0ffSStefano Garzarella if (val < vsk->buffer_min_size) 1559b9f2b0ffSStefano Garzarella val = vsk->buffer_min_size; 1560b9f2b0ffSStefano Garzarella 1561b9f2b0ffSStefano Garzarella if (val != vsk->buffer_size && 1562b9f2b0ffSStefano Garzarella transport && transport->notify_buffer_size) 1563b9f2b0ffSStefano Garzarella transport->notify_buffer_size(vsk, &val); 1564b9f2b0ffSStefano Garzarella 1565b9f2b0ffSStefano Garzarella vsk->buffer_size = val; 1566b9f2b0ffSStefano Garzarella } 1567b9f2b0ffSStefano Garzarella 1568a9e29e55SArseny Krasnov static int vsock_connectible_setsockopt(struct socket *sock, 1569d021c344SAndy King int level, 1570d021c344SAndy King int optname, 1571a7b75c5aSChristoph Hellwig sockptr_t optval, 1572d021c344SAndy King unsigned int optlen) 1573d021c344SAndy King { 1574d021c344SAndy King int err; 1575d021c344SAndy King struct sock *sk; 1576d021c344SAndy King struct vsock_sock *vsk; 1577fe502c4aSStefano Garzarella const struct vsock_transport *transport; 1578d021c344SAndy King u64 val; 1579d021c344SAndy King 1580d021c344SAndy King if (level != AF_VSOCK) 1581d021c344SAndy King return -ENOPROTOOPT; 1582d021c344SAndy King 1583d021c344SAndy King #define COPY_IN(_v) \ 1584d021c344SAndy King do { \ 1585d021c344SAndy King if (optlen < sizeof(_v)) { \ 1586d021c344SAndy King err = -EINVAL; \ 1587d021c344SAndy King goto exit; \ 1588d021c344SAndy King } \ 1589a7b75c5aSChristoph Hellwig if (copy_from_sockptr(&_v, optval, sizeof(_v)) != 0) { \ 1590d021c344SAndy King err = -EFAULT; \ 1591d021c344SAndy King goto exit; \ 1592d021c344SAndy King } \ 1593d021c344SAndy King } while (0) 1594d021c344SAndy King 1595d021c344SAndy King err = 0; 1596d021c344SAndy King sk = sock->sk; 1597d021c344SAndy King vsk = vsock_sk(sk); 1598d021c344SAndy King 1599d021c344SAndy King lock_sock(sk); 1600d021c344SAndy King 1601c518adafSAlexander Popov transport = vsk->transport; 1602c518adafSAlexander Popov 1603d021c344SAndy King switch (optname) { 1604d021c344SAndy King case SO_VM_SOCKETS_BUFFER_SIZE: 1605d021c344SAndy King COPY_IN(val); 1606b9f2b0ffSStefano Garzarella vsock_update_buffer_size(vsk, transport, val); 1607d021c344SAndy King break; 1608d021c344SAndy King 1609d021c344SAndy King case SO_VM_SOCKETS_BUFFER_MAX_SIZE: 1610d021c344SAndy King COPY_IN(val); 1611b9f2b0ffSStefano Garzarella vsk->buffer_max_size = val; 1612b9f2b0ffSStefano Garzarella vsock_update_buffer_size(vsk, transport, vsk->buffer_size); 1613d021c344SAndy King break; 1614d021c344SAndy King 1615d021c344SAndy King case SO_VM_SOCKETS_BUFFER_MIN_SIZE: 1616d021c344SAndy King COPY_IN(val); 1617b9f2b0ffSStefano Garzarella vsk->buffer_min_size = val; 1618b9f2b0ffSStefano Garzarella vsock_update_buffer_size(vsk, transport, vsk->buffer_size); 1619d021c344SAndy King break; 1620d021c344SAndy King 16214c1e34c0SRichard Palethorpe case SO_VM_SOCKETS_CONNECT_TIMEOUT_NEW: 16224c1e34c0SRichard Palethorpe case SO_VM_SOCKETS_CONNECT_TIMEOUT_OLD: { 16234c1e34c0SRichard Palethorpe struct __kernel_sock_timeval tv; 16244c1e34c0SRichard Palethorpe 16254c1e34c0SRichard Palethorpe err = sock_copy_user_timeval(&tv, optval, optlen, 16264c1e34c0SRichard Palethorpe optname == SO_VM_SOCKETS_CONNECT_TIMEOUT_OLD); 16274c1e34c0SRichard Palethorpe if (err) 16284c1e34c0SRichard Palethorpe break; 1629d021c344SAndy King if (tv.tv_sec >= 0 && tv.tv_usec < USEC_PER_SEC && 1630d021c344SAndy King tv.tv_sec < (MAX_SCHEDULE_TIMEOUT / HZ - 1)) { 1631d021c344SAndy King vsk->connect_timeout = tv.tv_sec * HZ + 16324c1e34c0SRichard Palethorpe DIV_ROUND_UP((unsigned long)tv.tv_usec, (USEC_PER_SEC / HZ)); 1633d021c344SAndy King if (vsk->connect_timeout == 0) 1634d021c344SAndy King vsk->connect_timeout = 1635d021c344SAndy King VSOCK_DEFAULT_CONNECT_TIMEOUT; 1636d021c344SAndy King 1637d021c344SAndy King } else { 1638d021c344SAndy King err = -ERANGE; 1639d021c344SAndy King } 1640d021c344SAndy King break; 1641d021c344SAndy King } 1642d021c344SAndy King 1643d021c344SAndy King default: 1644d021c344SAndy King err = -ENOPROTOOPT; 1645d021c344SAndy King break; 1646d021c344SAndy King } 1647d021c344SAndy King 1648d021c344SAndy King #undef COPY_IN 1649d021c344SAndy King 1650d021c344SAndy King exit: 1651d021c344SAndy King release_sock(sk); 1652d021c344SAndy King return err; 1653d021c344SAndy King } 1654d021c344SAndy King 1655a9e29e55SArseny Krasnov static int vsock_connectible_getsockopt(struct socket *sock, 1656d021c344SAndy King int level, int optname, 1657d021c344SAndy King char __user *optval, 1658d021c344SAndy King int __user *optlen) 1659d021c344SAndy King { 1660685c3f2fSRichard Palethorpe struct sock *sk = sock->sk; 1661685c3f2fSRichard Palethorpe struct vsock_sock *vsk = vsock_sk(sk); 1662685c3f2fSRichard Palethorpe 1663685c3f2fSRichard Palethorpe union { 1664685c3f2fSRichard Palethorpe u64 val64; 16654c1e34c0SRichard Palethorpe struct old_timeval32 tm32; 1666685c3f2fSRichard Palethorpe struct __kernel_old_timeval tm; 16674c1e34c0SRichard Palethorpe struct __kernel_sock_timeval stm; 1668685c3f2fSRichard Palethorpe } v; 1669685c3f2fSRichard Palethorpe 1670685c3f2fSRichard Palethorpe int lv = sizeof(v.val64); 1671d021c344SAndy King int len; 1672d021c344SAndy King 1673d021c344SAndy King if (level != AF_VSOCK) 1674d021c344SAndy King return -ENOPROTOOPT; 1675d021c344SAndy King 1676685c3f2fSRichard Palethorpe if (get_user(len, optlen)) 1677685c3f2fSRichard Palethorpe return -EFAULT; 1678d021c344SAndy King 1679685c3f2fSRichard Palethorpe memset(&v, 0, sizeof(v)); 1680d021c344SAndy King 1681d021c344SAndy King switch (optname) { 1682d021c344SAndy King case SO_VM_SOCKETS_BUFFER_SIZE: 1683685c3f2fSRichard Palethorpe v.val64 = vsk->buffer_size; 1684d021c344SAndy King break; 1685d021c344SAndy King 1686d021c344SAndy King case SO_VM_SOCKETS_BUFFER_MAX_SIZE: 1687685c3f2fSRichard Palethorpe v.val64 = vsk->buffer_max_size; 1688d021c344SAndy King break; 1689d021c344SAndy King 1690d021c344SAndy King case SO_VM_SOCKETS_BUFFER_MIN_SIZE: 1691685c3f2fSRichard Palethorpe v.val64 = vsk->buffer_min_size; 1692d021c344SAndy King break; 1693d021c344SAndy King 16944c1e34c0SRichard Palethorpe case SO_VM_SOCKETS_CONNECT_TIMEOUT_NEW: 16954c1e34c0SRichard Palethorpe case SO_VM_SOCKETS_CONNECT_TIMEOUT_OLD: 16964c1e34c0SRichard Palethorpe lv = sock_get_timeout(vsk->connect_timeout, &v, 16974c1e34c0SRichard Palethorpe optname == SO_VM_SOCKETS_CONNECT_TIMEOUT_OLD); 1698d021c344SAndy King break; 1699685c3f2fSRichard Palethorpe 1700d021c344SAndy King default: 1701d021c344SAndy King return -ENOPROTOOPT; 1702d021c344SAndy King } 1703d021c344SAndy King 1704685c3f2fSRichard Palethorpe if (len < lv) 1705685c3f2fSRichard Palethorpe return -EINVAL; 1706685c3f2fSRichard Palethorpe if (len > lv) 1707685c3f2fSRichard Palethorpe len = lv; 1708685c3f2fSRichard Palethorpe if (copy_to_user(optval, &v, len)) 1709d021c344SAndy King return -EFAULT; 1710d021c344SAndy King 1711685c3f2fSRichard Palethorpe if (put_user(len, optlen)) 1712685c3f2fSRichard Palethorpe return -EFAULT; 1713d021c344SAndy King 1714d021c344SAndy King return 0; 1715d021c344SAndy King } 1716d021c344SAndy King 1717a9e29e55SArseny Krasnov static int vsock_connectible_sendmsg(struct socket *sock, struct msghdr *msg, 17181b784140SYing Xue size_t len) 1719d021c344SAndy King { 1720d021c344SAndy King struct sock *sk; 1721d021c344SAndy King struct vsock_sock *vsk; 1722fe502c4aSStefano Garzarella const struct vsock_transport *transport; 1723d021c344SAndy King ssize_t total_written; 1724d021c344SAndy King long timeout; 1725d021c344SAndy King int err; 1726d021c344SAndy King struct vsock_transport_send_notify_data send_data; 1727499fde66SWANG Cong DEFINE_WAIT_FUNC(wait, woken_wake_function); 1728d021c344SAndy King 1729d021c344SAndy King sk = sock->sk; 1730d021c344SAndy King vsk = vsock_sk(sk); 1731d021c344SAndy King total_written = 0; 1732d021c344SAndy King err = 0; 1733d021c344SAndy King 1734d021c344SAndy King if (msg->msg_flags & MSG_OOB) 1735d021c344SAndy King return -EOPNOTSUPP; 1736d021c344SAndy King 1737d021c344SAndy King lock_sock(sk); 1738d021c344SAndy King 1739c518adafSAlexander Popov transport = vsk->transport; 1740c518adafSAlexander Popov 17418cb48554SArseny Krasnov /* Callers should not provide a destination with connection oriented 17428cb48554SArseny Krasnov * sockets. 17438cb48554SArseny Krasnov */ 1744d021c344SAndy King if (msg->msg_namelen) { 17453b4477d2SStefan Hajnoczi err = sk->sk_state == TCP_ESTABLISHED ? -EISCONN : -EOPNOTSUPP; 1746d021c344SAndy King goto out; 1747d021c344SAndy King } 1748d021c344SAndy King 1749d021c344SAndy King /* Send data only if both sides are not shutdown in the direction. */ 1750d021c344SAndy King if (sk->sk_shutdown & SEND_SHUTDOWN || 1751d021c344SAndy King vsk->peer_shutdown & RCV_SHUTDOWN) { 1752d021c344SAndy King err = -EPIPE; 1753d021c344SAndy King goto out; 1754d021c344SAndy King } 1755d021c344SAndy King 1756c0cfa2d8SStefano Garzarella if (!transport || sk->sk_state != TCP_ESTABLISHED || 1757d021c344SAndy King !vsock_addr_bound(&vsk->local_addr)) { 1758d021c344SAndy King err = -ENOTCONN; 1759d021c344SAndy King goto out; 1760d021c344SAndy King } 1761d021c344SAndy King 1762d021c344SAndy King if (!vsock_addr_bound(&vsk->remote_addr)) { 1763d021c344SAndy King err = -EDESTADDRREQ; 1764d021c344SAndy King goto out; 1765d021c344SAndy King } 1766d021c344SAndy King 1767d021c344SAndy King /* Wait for room in the produce queue to enqueue our user's data. */ 1768d021c344SAndy King timeout = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT); 1769d021c344SAndy King 1770d021c344SAndy King err = transport->notify_send_init(vsk, &send_data); 1771d021c344SAndy King if (err < 0) 1772d021c344SAndy King goto out; 1773d021c344SAndy King 1774d021c344SAndy King while (total_written < len) { 1775d021c344SAndy King ssize_t written; 1776d021c344SAndy King 1777499fde66SWANG Cong add_wait_queue(sk_sleep(sk), &wait); 1778d021c344SAndy King while (vsock_stream_has_space(vsk) == 0 && 1779d021c344SAndy King sk->sk_err == 0 && 1780d021c344SAndy King !(sk->sk_shutdown & SEND_SHUTDOWN) && 1781d021c344SAndy King !(vsk->peer_shutdown & RCV_SHUTDOWN)) { 1782d021c344SAndy King 1783d021c344SAndy King /* Don't wait for non-blocking sockets. */ 1784d021c344SAndy King if (timeout == 0) { 1785d021c344SAndy King err = -EAGAIN; 1786499fde66SWANG Cong remove_wait_queue(sk_sleep(sk), &wait); 1787f7f9b5e7SClaudio Imbrenda goto out_err; 1788d021c344SAndy King } 1789d021c344SAndy King 1790d021c344SAndy King err = transport->notify_send_pre_block(vsk, &send_data); 1791f7f9b5e7SClaudio Imbrenda if (err < 0) { 1792499fde66SWANG Cong remove_wait_queue(sk_sleep(sk), &wait); 1793f7f9b5e7SClaudio Imbrenda goto out_err; 1794f7f9b5e7SClaudio Imbrenda } 1795d021c344SAndy King 1796d021c344SAndy King release_sock(sk); 1797499fde66SWANG Cong timeout = wait_woken(&wait, TASK_INTERRUPTIBLE, timeout); 1798d021c344SAndy King lock_sock(sk); 1799d021c344SAndy King if (signal_pending(current)) { 1800d021c344SAndy King err = sock_intr_errno(timeout); 1801499fde66SWANG Cong remove_wait_queue(sk_sleep(sk), &wait); 1802f7f9b5e7SClaudio Imbrenda goto out_err; 1803d021c344SAndy King } else if (timeout == 0) { 1804d021c344SAndy King err = -EAGAIN; 1805499fde66SWANG Cong remove_wait_queue(sk_sleep(sk), &wait); 1806f7f9b5e7SClaudio Imbrenda goto out_err; 1807d021c344SAndy King } 1808d021c344SAndy King } 1809499fde66SWANG Cong remove_wait_queue(sk_sleep(sk), &wait); 1810d021c344SAndy King 1811d021c344SAndy King /* These checks occur both as part of and after the loop 1812d021c344SAndy King * conditional since we need to check before and after 1813d021c344SAndy King * sleeping. 1814d021c344SAndy King */ 1815d021c344SAndy King if (sk->sk_err) { 1816d021c344SAndy King err = -sk->sk_err; 1817f7f9b5e7SClaudio Imbrenda goto out_err; 1818d021c344SAndy King } else if ((sk->sk_shutdown & SEND_SHUTDOWN) || 1819d021c344SAndy King (vsk->peer_shutdown & RCV_SHUTDOWN)) { 1820d021c344SAndy King err = -EPIPE; 1821f7f9b5e7SClaudio Imbrenda goto out_err; 1822d021c344SAndy King } 1823d021c344SAndy King 1824d021c344SAndy King err = transport->notify_send_pre_enqueue(vsk, &send_data); 1825d021c344SAndy King if (err < 0) 1826f7f9b5e7SClaudio Imbrenda goto out_err; 1827d021c344SAndy King 1828d021c344SAndy King /* Note that enqueue will only write as many bytes as are free 1829d021c344SAndy King * in the produce queue, so we don't need to ensure len is 1830d021c344SAndy King * smaller than the queue size. It is the caller's 1831d021c344SAndy King * responsibility to check how many bytes we were able to send. 1832d021c344SAndy King */ 1833d021c344SAndy King 1834fbe70c48SArseny Krasnov if (sk->sk_type == SOCK_SEQPACKET) { 1835fbe70c48SArseny Krasnov written = transport->seqpacket_enqueue(vsk, 1836fbe70c48SArseny Krasnov msg, len - total_written); 1837fbe70c48SArseny Krasnov } else { 1838fbe70c48SArseny Krasnov written = transport->stream_enqueue(vsk, 1839fbe70c48SArseny Krasnov msg, len - total_written); 1840fbe70c48SArseny Krasnov } 1841d021c344SAndy King if (written < 0) { 1842d021c344SAndy King err = -ENOMEM; 1843f7f9b5e7SClaudio Imbrenda goto out_err; 1844d021c344SAndy King } 1845d021c344SAndy King 1846d021c344SAndy King total_written += written; 1847d021c344SAndy King 1848d021c344SAndy King err = transport->notify_send_post_enqueue( 1849d021c344SAndy King vsk, written, &send_data); 1850d021c344SAndy King if (err < 0) 1851f7f9b5e7SClaudio Imbrenda goto out_err; 1852d021c344SAndy King 1853d021c344SAndy King } 1854d021c344SAndy King 1855f7f9b5e7SClaudio Imbrenda out_err: 1856fbe70c48SArseny Krasnov if (total_written > 0) { 1857fbe70c48SArseny Krasnov /* Return number of written bytes only if: 1858fbe70c48SArseny Krasnov * 1) SOCK_STREAM socket. 1859fbe70c48SArseny Krasnov * 2) SOCK_SEQPACKET socket when whole buffer is sent. 1860fbe70c48SArseny Krasnov */ 1861fbe70c48SArseny Krasnov if (sk->sk_type == SOCK_STREAM || total_written == len) 1862d021c344SAndy King err = total_written; 1863fbe70c48SArseny Krasnov } 1864d021c344SAndy King out: 1865d021c344SAndy King release_sock(sk); 1866d021c344SAndy King return err; 1867d021c344SAndy King } 1868d021c344SAndy King 18690de5b2e6SStefano Garzarella static int vsock_connectible_wait_data(struct sock *sk, 18700de5b2e6SStefano Garzarella struct wait_queue_entry *wait, 1871b3f7fd54SArseny Krasnov long timeout, 1872b3f7fd54SArseny Krasnov struct vsock_transport_recv_notify_data *recv_data, 1873b3f7fd54SArseny Krasnov size_t target) 1874b3f7fd54SArseny Krasnov { 1875b3f7fd54SArseny Krasnov const struct vsock_transport *transport; 1876b3f7fd54SArseny Krasnov struct vsock_sock *vsk; 1877b3f7fd54SArseny Krasnov s64 data; 1878b3f7fd54SArseny Krasnov int err; 1879b3f7fd54SArseny Krasnov 1880b3f7fd54SArseny Krasnov vsk = vsock_sk(sk); 1881b3f7fd54SArseny Krasnov err = 0; 1882b3f7fd54SArseny Krasnov transport = vsk->transport; 1883b3f7fd54SArseny Krasnov 1884cc97141aSStefano Garzarella while ((data = vsock_connectible_has_data(vsk)) == 0) { 1885b3f7fd54SArseny Krasnov prepare_to_wait(sk_sleep(sk), wait, TASK_INTERRUPTIBLE); 1886b3f7fd54SArseny Krasnov 1887b3f7fd54SArseny Krasnov if (sk->sk_err != 0 || 1888b3f7fd54SArseny Krasnov (sk->sk_shutdown & RCV_SHUTDOWN) || 1889b3f7fd54SArseny Krasnov (vsk->peer_shutdown & SEND_SHUTDOWN)) { 1890b3f7fd54SArseny Krasnov break; 1891b3f7fd54SArseny Krasnov } 1892b3f7fd54SArseny Krasnov 1893b3f7fd54SArseny Krasnov /* Don't wait for non-blocking sockets. */ 1894b3f7fd54SArseny Krasnov if (timeout == 0) { 1895b3f7fd54SArseny Krasnov err = -EAGAIN; 1896b3f7fd54SArseny Krasnov break; 1897b3f7fd54SArseny Krasnov } 1898b3f7fd54SArseny Krasnov 1899b3f7fd54SArseny Krasnov if (recv_data) { 1900b3f7fd54SArseny Krasnov err = transport->notify_recv_pre_block(vsk, target, recv_data); 1901b3f7fd54SArseny Krasnov if (err < 0) 1902b3f7fd54SArseny Krasnov break; 1903b3f7fd54SArseny Krasnov } 1904b3f7fd54SArseny Krasnov 1905b3f7fd54SArseny Krasnov release_sock(sk); 1906b3f7fd54SArseny Krasnov timeout = schedule_timeout(timeout); 1907b3f7fd54SArseny Krasnov lock_sock(sk); 1908b3f7fd54SArseny Krasnov 1909b3f7fd54SArseny Krasnov if (signal_pending(current)) { 1910b3f7fd54SArseny Krasnov err = sock_intr_errno(timeout); 1911b3f7fd54SArseny Krasnov break; 1912b3f7fd54SArseny Krasnov } else if (timeout == 0) { 1913b3f7fd54SArseny Krasnov err = -EAGAIN; 1914b3f7fd54SArseny Krasnov break; 1915b3f7fd54SArseny Krasnov } 1916b3f7fd54SArseny Krasnov } 1917b3f7fd54SArseny Krasnov 1918b3f7fd54SArseny Krasnov finish_wait(sk_sleep(sk), wait); 1919b3f7fd54SArseny Krasnov 1920b3f7fd54SArseny Krasnov if (err) 1921b3f7fd54SArseny Krasnov return err; 1922b3f7fd54SArseny Krasnov 1923b3f7fd54SArseny Krasnov /* Internal transport error when checking for available 1924b3f7fd54SArseny Krasnov * data. XXX This should be changed to a connection 1925b3f7fd54SArseny Krasnov * reset in a later change. 1926b3f7fd54SArseny Krasnov */ 1927b3f7fd54SArseny Krasnov if (data < 0) 1928b3f7fd54SArseny Krasnov return -ENOMEM; 1929b3f7fd54SArseny Krasnov 1930b3f7fd54SArseny Krasnov return data; 1931b3f7fd54SArseny Krasnov } 1932b3f7fd54SArseny Krasnov 193319c1b90eSArseny Krasnov static int __vsock_stream_recvmsg(struct sock *sk, struct msghdr *msg, 193419c1b90eSArseny Krasnov size_t len, int flags) 1935d021c344SAndy King { 1936d021c344SAndy King struct vsock_transport_recv_notify_data recv_data; 193719c1b90eSArseny Krasnov const struct vsock_transport *transport; 193819c1b90eSArseny Krasnov struct vsock_sock *vsk; 193919c1b90eSArseny Krasnov ssize_t copied; 194019c1b90eSArseny Krasnov size_t target; 194119c1b90eSArseny Krasnov long timeout; 194219c1b90eSArseny Krasnov int err; 1943d021c344SAndy King 1944d021c344SAndy King DEFINE_WAIT(wait); 1945d021c344SAndy King 1946d021c344SAndy King vsk = vsock_sk(sk); 1947c518adafSAlexander Popov transport = vsk->transport; 1948c518adafSAlexander Popov 1949d021c344SAndy King /* We must not copy less than target bytes into the user's buffer 1950d021c344SAndy King * before returning successfully, so we wait for the consume queue to 1951d021c344SAndy King * have that much data to consume before dequeueing. Note that this 1952d021c344SAndy King * makes it impossible to handle cases where target is greater than the 1953d021c344SAndy King * queue size. 1954d021c344SAndy King */ 1955d021c344SAndy King target = sock_rcvlowat(sk, flags & MSG_WAITALL, len); 1956d021c344SAndy King if (target >= transport->stream_rcvhiwat(vsk)) { 1957d021c344SAndy King err = -ENOMEM; 1958d021c344SAndy King goto out; 1959d021c344SAndy King } 1960d021c344SAndy King timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); 1961d021c344SAndy King copied = 0; 1962d021c344SAndy King 1963d021c344SAndy King err = transport->notify_recv_init(vsk, target, &recv_data); 1964d021c344SAndy King if (err < 0) 1965d021c344SAndy King goto out; 1966d021c344SAndy King 1967d021c344SAndy King 1968d021c344SAndy King while (1) { 1969f7f9b5e7SClaudio Imbrenda ssize_t read; 1970f7f9b5e7SClaudio Imbrenda 19710de5b2e6SStefano Garzarella err = vsock_connectible_wait_data(sk, &wait, timeout, 19720de5b2e6SStefano Garzarella &recv_data, target); 1973b3f7fd54SArseny Krasnov if (err <= 0) 1974b3f7fd54SArseny Krasnov break; 1975d021c344SAndy King 1976b3f7fd54SArseny Krasnov err = transport->notify_recv_pre_dequeue(vsk, target, 1977b3f7fd54SArseny Krasnov &recv_data); 1978d021c344SAndy King if (err < 0) 1979d021c344SAndy King break; 1980d021c344SAndy King 1981b3f7fd54SArseny Krasnov read = transport->stream_dequeue(vsk, msg, len - copied, flags); 1982d021c344SAndy King if (read < 0) { 1983d021c344SAndy King err = -ENOMEM; 1984d021c344SAndy King break; 1985d021c344SAndy King } 1986d021c344SAndy King 1987d021c344SAndy King copied += read; 1988d021c344SAndy King 1989b3f7fd54SArseny Krasnov err = transport->notify_recv_post_dequeue(vsk, target, read, 1990d021c344SAndy King !(flags & MSG_PEEK), &recv_data); 1991d021c344SAndy King if (err < 0) 1992f7f9b5e7SClaudio Imbrenda goto out; 1993d021c344SAndy King 1994d021c344SAndy King if (read >= target || flags & MSG_PEEK) 1995d021c344SAndy King break; 1996d021c344SAndy King 1997d021c344SAndy King target -= read; 1998d021c344SAndy King } 1999d021c344SAndy King 2000d021c344SAndy King if (sk->sk_err) 2001d021c344SAndy King err = -sk->sk_err; 2002d021c344SAndy King else if (sk->sk_shutdown & RCV_SHUTDOWN) 2003d021c344SAndy King err = 0; 2004d021c344SAndy King 2005dedc58e0SIan Campbell if (copied > 0) 2006d021c344SAndy King err = copied; 2007d021c344SAndy King 2008d021c344SAndy King out: 200919c1b90eSArseny Krasnov return err; 201019c1b90eSArseny Krasnov } 201119c1b90eSArseny Krasnov 20129942c192SArseny Krasnov static int __vsock_seqpacket_recvmsg(struct sock *sk, struct msghdr *msg, 20139942c192SArseny Krasnov size_t len, int flags) 20149942c192SArseny Krasnov { 20159942c192SArseny Krasnov const struct vsock_transport *transport; 20169942c192SArseny Krasnov struct vsock_sock *vsk; 20178fc92b7cSArseny Krasnov ssize_t msg_len; 20189942c192SArseny Krasnov long timeout; 20199942c192SArseny Krasnov int err = 0; 20209942c192SArseny Krasnov DEFINE_WAIT(wait); 20219942c192SArseny Krasnov 20229942c192SArseny Krasnov vsk = vsock_sk(sk); 20239942c192SArseny Krasnov transport = vsk->transport; 20249942c192SArseny Krasnov 20259942c192SArseny Krasnov timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); 20269942c192SArseny Krasnov 20270de5b2e6SStefano Garzarella err = vsock_connectible_wait_data(sk, &wait, timeout, NULL, 0); 20289942c192SArseny Krasnov if (err <= 0) 20299942c192SArseny Krasnov goto out; 20309942c192SArseny Krasnov 20318fc92b7cSArseny Krasnov msg_len = transport->seqpacket_dequeue(vsk, msg, flags); 20329942c192SArseny Krasnov 20338fc92b7cSArseny Krasnov if (msg_len < 0) { 20349942c192SArseny Krasnov err = -ENOMEM; 20359942c192SArseny Krasnov goto out; 20369942c192SArseny Krasnov } 20379942c192SArseny Krasnov 20389942c192SArseny Krasnov if (sk->sk_err) { 20399942c192SArseny Krasnov err = -sk->sk_err; 20409942c192SArseny Krasnov } else if (sk->sk_shutdown & RCV_SHUTDOWN) { 20419942c192SArseny Krasnov err = 0; 20429942c192SArseny Krasnov } else { 20439942c192SArseny Krasnov /* User sets MSG_TRUNC, so return real length of 20449942c192SArseny Krasnov * packet. 20459942c192SArseny Krasnov */ 20469942c192SArseny Krasnov if (flags & MSG_TRUNC) 20478fc92b7cSArseny Krasnov err = msg_len; 20489942c192SArseny Krasnov else 20499942c192SArseny Krasnov err = len - msg_data_left(msg); 20509942c192SArseny Krasnov 20519942c192SArseny Krasnov /* Always set MSG_TRUNC if real length of packet is 20529942c192SArseny Krasnov * bigger than user's buffer. 20539942c192SArseny Krasnov */ 20548fc92b7cSArseny Krasnov if (msg_len > len) 20559942c192SArseny Krasnov msg->msg_flags |= MSG_TRUNC; 20569942c192SArseny Krasnov } 20579942c192SArseny Krasnov 20589942c192SArseny Krasnov out: 20599942c192SArseny Krasnov return err; 20609942c192SArseny Krasnov } 20619942c192SArseny Krasnov 206219c1b90eSArseny Krasnov static int 206319c1b90eSArseny Krasnov vsock_connectible_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, 206419c1b90eSArseny Krasnov int flags) 206519c1b90eSArseny Krasnov { 206619c1b90eSArseny Krasnov struct sock *sk; 206719c1b90eSArseny Krasnov struct vsock_sock *vsk; 206819c1b90eSArseny Krasnov const struct vsock_transport *transport; 206919c1b90eSArseny Krasnov int err; 207019c1b90eSArseny Krasnov 207119c1b90eSArseny Krasnov DEFINE_WAIT(wait); 207219c1b90eSArseny Krasnov 207319c1b90eSArseny Krasnov sk = sock->sk; 207419c1b90eSArseny Krasnov vsk = vsock_sk(sk); 207519c1b90eSArseny Krasnov err = 0; 207619c1b90eSArseny Krasnov 207719c1b90eSArseny Krasnov lock_sock(sk); 207819c1b90eSArseny Krasnov 207919c1b90eSArseny Krasnov transport = vsk->transport; 208019c1b90eSArseny Krasnov 208119c1b90eSArseny Krasnov if (!transport || sk->sk_state != TCP_ESTABLISHED) { 208219c1b90eSArseny Krasnov /* Recvmsg is supposed to return 0 if a peer performs an 208319c1b90eSArseny Krasnov * orderly shutdown. Differentiate between that case and when a 208419c1b90eSArseny Krasnov * peer has not connected or a local shutdown occurred with the 208519c1b90eSArseny Krasnov * SOCK_DONE flag. 208619c1b90eSArseny Krasnov */ 208719c1b90eSArseny Krasnov if (sock_flag(sk, SOCK_DONE)) 208819c1b90eSArseny Krasnov err = 0; 208919c1b90eSArseny Krasnov else 209019c1b90eSArseny Krasnov err = -ENOTCONN; 209119c1b90eSArseny Krasnov 209219c1b90eSArseny Krasnov goto out; 209319c1b90eSArseny Krasnov } 209419c1b90eSArseny Krasnov 209519c1b90eSArseny Krasnov if (flags & MSG_OOB) { 209619c1b90eSArseny Krasnov err = -EOPNOTSUPP; 209719c1b90eSArseny Krasnov goto out; 209819c1b90eSArseny Krasnov } 209919c1b90eSArseny Krasnov 210019c1b90eSArseny Krasnov /* We don't check peer_shutdown flag here since peer may actually shut 210119c1b90eSArseny Krasnov * down, but there can be data in the queue that a local socket can 210219c1b90eSArseny Krasnov * receive. 210319c1b90eSArseny Krasnov */ 210419c1b90eSArseny Krasnov if (sk->sk_shutdown & RCV_SHUTDOWN) { 210519c1b90eSArseny Krasnov err = 0; 210619c1b90eSArseny Krasnov goto out; 210719c1b90eSArseny Krasnov } 210819c1b90eSArseny Krasnov 210919c1b90eSArseny Krasnov /* It is valid on Linux to pass in a zero-length receive buffer. This 211019c1b90eSArseny Krasnov * is not an error. We may as well bail out now. 211119c1b90eSArseny Krasnov */ 211219c1b90eSArseny Krasnov if (!len) { 211319c1b90eSArseny Krasnov err = 0; 211419c1b90eSArseny Krasnov goto out; 211519c1b90eSArseny Krasnov } 211619c1b90eSArseny Krasnov 21179942c192SArseny Krasnov if (sk->sk_type == SOCK_STREAM) 211819c1b90eSArseny Krasnov err = __vsock_stream_recvmsg(sk, msg, len, flags); 21199942c192SArseny Krasnov else 21209942c192SArseny Krasnov err = __vsock_seqpacket_recvmsg(sk, msg, len, flags); 212119c1b90eSArseny Krasnov 212219c1b90eSArseny Krasnov out: 2123d021c344SAndy King release_sock(sk); 2124d021c344SAndy King return err; 2125d021c344SAndy King } 2126d021c344SAndy King 2127d021c344SAndy King static const struct proto_ops vsock_stream_ops = { 2128d021c344SAndy King .family = PF_VSOCK, 2129d021c344SAndy King .owner = THIS_MODULE, 2130d021c344SAndy King .release = vsock_release, 2131d021c344SAndy King .bind = vsock_bind, 2132a9e29e55SArseny Krasnov .connect = vsock_connect, 2133d021c344SAndy King .socketpair = sock_no_socketpair, 2134d021c344SAndy King .accept = vsock_accept, 2135d021c344SAndy King .getname = vsock_getname, 2136a11e1d43SLinus Torvalds .poll = vsock_poll, 2137d021c344SAndy King .ioctl = sock_no_ioctl, 2138d021c344SAndy King .listen = vsock_listen, 2139d021c344SAndy King .shutdown = vsock_shutdown, 2140a9e29e55SArseny Krasnov .setsockopt = vsock_connectible_setsockopt, 2141a9e29e55SArseny Krasnov .getsockopt = vsock_connectible_getsockopt, 2142a9e29e55SArseny Krasnov .sendmsg = vsock_connectible_sendmsg, 2143a9e29e55SArseny Krasnov .recvmsg = vsock_connectible_recvmsg, 2144d021c344SAndy King .mmap = sock_no_mmap, 2145d021c344SAndy King .sendpage = sock_no_sendpage, 2146d021c344SAndy King }; 2147d021c344SAndy King 21480798e78bSArseny Krasnov static const struct proto_ops vsock_seqpacket_ops = { 21490798e78bSArseny Krasnov .family = PF_VSOCK, 21500798e78bSArseny Krasnov .owner = THIS_MODULE, 21510798e78bSArseny Krasnov .release = vsock_release, 21520798e78bSArseny Krasnov .bind = vsock_bind, 21530798e78bSArseny Krasnov .connect = vsock_connect, 21540798e78bSArseny Krasnov .socketpair = sock_no_socketpair, 21550798e78bSArseny Krasnov .accept = vsock_accept, 21560798e78bSArseny Krasnov .getname = vsock_getname, 21570798e78bSArseny Krasnov .poll = vsock_poll, 21580798e78bSArseny Krasnov .ioctl = sock_no_ioctl, 21590798e78bSArseny Krasnov .listen = vsock_listen, 21600798e78bSArseny Krasnov .shutdown = vsock_shutdown, 21610798e78bSArseny Krasnov .setsockopt = vsock_connectible_setsockopt, 21620798e78bSArseny Krasnov .getsockopt = vsock_connectible_getsockopt, 21630798e78bSArseny Krasnov .sendmsg = vsock_connectible_sendmsg, 21640798e78bSArseny Krasnov .recvmsg = vsock_connectible_recvmsg, 21650798e78bSArseny Krasnov .mmap = sock_no_mmap, 21660798e78bSArseny Krasnov .sendpage = sock_no_sendpage, 21670798e78bSArseny Krasnov }; 21680798e78bSArseny Krasnov 2169d021c344SAndy King static int vsock_create(struct net *net, struct socket *sock, 2170d021c344SAndy King int protocol, int kern) 2171d021c344SAndy King { 2172c0cfa2d8SStefano Garzarella struct vsock_sock *vsk; 217355f3e149SStefano Garzarella struct sock *sk; 2174c0cfa2d8SStefano Garzarella int ret; 217555f3e149SStefano Garzarella 2176d021c344SAndy King if (!sock) 2177d021c344SAndy King return -EINVAL; 2178d021c344SAndy King 21796cf1c5fcSAndy King if (protocol && protocol != PF_VSOCK) 2180d021c344SAndy King return -EPROTONOSUPPORT; 2181d021c344SAndy King 2182d021c344SAndy King switch (sock->type) { 2183d021c344SAndy King case SOCK_DGRAM: 2184d021c344SAndy King sock->ops = &vsock_dgram_ops; 2185d021c344SAndy King break; 2186d021c344SAndy King case SOCK_STREAM: 2187d021c344SAndy King sock->ops = &vsock_stream_ops; 2188d021c344SAndy King break; 21890798e78bSArseny Krasnov case SOCK_SEQPACKET: 21900798e78bSArseny Krasnov sock->ops = &vsock_seqpacket_ops; 21910798e78bSArseny Krasnov break; 2192d021c344SAndy King default: 2193d021c344SAndy King return -ESOCKTNOSUPPORT; 2194d021c344SAndy King } 2195d021c344SAndy King 2196d021c344SAndy King sock->state = SS_UNCONNECTED; 2197d021c344SAndy King 219855f3e149SStefano Garzarella sk = __vsock_create(net, sock, NULL, GFP_KERNEL, 0, kern); 219955f3e149SStefano Garzarella if (!sk) 220055f3e149SStefano Garzarella return -ENOMEM; 220155f3e149SStefano Garzarella 2202c0cfa2d8SStefano Garzarella vsk = vsock_sk(sk); 2203c0cfa2d8SStefano Garzarella 2204c0cfa2d8SStefano Garzarella if (sock->type == SOCK_DGRAM) { 2205c0cfa2d8SStefano Garzarella ret = vsock_assign_transport(vsk, NULL); 2206c0cfa2d8SStefano Garzarella if (ret < 0) { 2207c0cfa2d8SStefano Garzarella sock_put(sk); 2208c0cfa2d8SStefano Garzarella return ret; 2209c0cfa2d8SStefano Garzarella } 2210c0cfa2d8SStefano Garzarella } 2211c0cfa2d8SStefano Garzarella 2212c0cfa2d8SStefano Garzarella vsock_insert_unbound(vsk); 221355f3e149SStefano Garzarella 221455f3e149SStefano Garzarella return 0; 2215d021c344SAndy King } 2216d021c344SAndy King 2217d021c344SAndy King static const struct net_proto_family vsock_family_ops = { 2218d021c344SAndy King .family = AF_VSOCK, 2219d021c344SAndy King .create = vsock_create, 2220d021c344SAndy King .owner = THIS_MODULE, 2221d021c344SAndy King }; 2222d021c344SAndy King 2223d021c344SAndy King static long vsock_dev_do_ioctl(struct file *filp, 2224d021c344SAndy King unsigned int cmd, void __user *ptr) 2225d021c344SAndy King { 2226d021c344SAndy King u32 __user *p = ptr; 2227c0cfa2d8SStefano Garzarella u32 cid = VMADDR_CID_ANY; 2228d021c344SAndy King int retval = 0; 2229d021c344SAndy King 2230d021c344SAndy King switch (cmd) { 2231d021c344SAndy King case IOCTL_VM_SOCKETS_GET_LOCAL_CID: 2232c0cfa2d8SStefano Garzarella /* To be compatible with the VMCI behavior, we prioritize the 2233c0cfa2d8SStefano Garzarella * guest CID instead of well-know host CID (VMADDR_CID_HOST). 2234c0cfa2d8SStefano Garzarella */ 2235c0cfa2d8SStefano Garzarella if (transport_g2h) 2236c0cfa2d8SStefano Garzarella cid = transport_g2h->get_local_cid(); 2237c0cfa2d8SStefano Garzarella else if (transport_h2g) 2238c0cfa2d8SStefano Garzarella cid = transport_h2g->get_local_cid(); 2239c0cfa2d8SStefano Garzarella 2240c0cfa2d8SStefano Garzarella if (put_user(cid, p) != 0) 2241d021c344SAndy King retval = -EFAULT; 2242d021c344SAndy King break; 2243d021c344SAndy King 2244d021c344SAndy King default: 2245c3e448cdSColin Ian King retval = -ENOIOCTLCMD; 2246d021c344SAndy King } 2247d021c344SAndy King 2248d021c344SAndy King return retval; 2249d021c344SAndy King } 2250d021c344SAndy King 2251d021c344SAndy King static long vsock_dev_ioctl(struct file *filp, 2252d021c344SAndy King unsigned int cmd, unsigned long arg) 2253d021c344SAndy King { 2254d021c344SAndy King return vsock_dev_do_ioctl(filp, cmd, (void __user *)arg); 2255d021c344SAndy King } 2256d021c344SAndy King 2257d021c344SAndy King #ifdef CONFIG_COMPAT 2258d021c344SAndy King static long vsock_dev_compat_ioctl(struct file *filp, 2259d021c344SAndy King unsigned int cmd, unsigned long arg) 2260d021c344SAndy King { 2261d021c344SAndy King return vsock_dev_do_ioctl(filp, cmd, compat_ptr(arg)); 2262d021c344SAndy King } 2263d021c344SAndy King #endif 2264d021c344SAndy King 2265d021c344SAndy King static const struct file_operations vsock_device_ops = { 2266d021c344SAndy King .owner = THIS_MODULE, 2267d021c344SAndy King .unlocked_ioctl = vsock_dev_ioctl, 2268d021c344SAndy King #ifdef CONFIG_COMPAT 2269d021c344SAndy King .compat_ioctl = vsock_dev_compat_ioctl, 2270d021c344SAndy King #endif 2271d021c344SAndy King .open = nonseekable_open, 2272d021c344SAndy King }; 2273d021c344SAndy King 2274d021c344SAndy King static struct miscdevice vsock_device = { 2275d021c344SAndy King .name = "vsock", 2276d021c344SAndy King .fops = &vsock_device_ops, 2277d021c344SAndy King }; 2278d021c344SAndy King 2279c0cfa2d8SStefano Garzarella static int __init vsock_init(void) 2280d021c344SAndy King { 2281c0cfa2d8SStefano Garzarella int err = 0; 22822c4a336eSAndy King 2283c0cfa2d8SStefano Garzarella vsock_init_tables(); 22842c4a336eSAndy King 2285c0cfa2d8SStefano Garzarella vsock_proto.owner = THIS_MODULE; 22866ad0b2f7SAsias He vsock_device.minor = MISC_DYNAMIC_MINOR; 2287d021c344SAndy King err = misc_register(&vsock_device); 2288d021c344SAndy King if (err) { 2289d021c344SAndy King pr_err("Failed to register misc device\n"); 2290f6a835bbSGao feng goto err_reset_transport; 2291d021c344SAndy King } 2292d021c344SAndy King 2293d021c344SAndy King err = proto_register(&vsock_proto, 1); /* we want our slab */ 2294d021c344SAndy King if (err) { 2295d021c344SAndy King pr_err("Cannot register vsock protocol\n"); 2296f6a835bbSGao feng goto err_deregister_misc; 2297d021c344SAndy King } 2298d021c344SAndy King 2299d021c344SAndy King err = sock_register(&vsock_family_ops); 2300d021c344SAndy King if (err) { 2301d021c344SAndy King pr_err("could not register af_vsock (%d) address family: %d\n", 2302d021c344SAndy King AF_VSOCK, err); 2303d021c344SAndy King goto err_unregister_proto; 2304d021c344SAndy King } 2305d021c344SAndy King 2306d021c344SAndy King return 0; 2307d021c344SAndy King 2308d021c344SAndy King err_unregister_proto: 2309d021c344SAndy King proto_unregister(&vsock_proto); 2310f6a835bbSGao feng err_deregister_misc: 2311d021c344SAndy King misc_deregister(&vsock_device); 2312f6a835bbSGao feng err_reset_transport: 2313d021c344SAndy King return err; 2314d021c344SAndy King } 2315d021c344SAndy King 2316c0cfa2d8SStefano Garzarella static void __exit vsock_exit(void) 2317d021c344SAndy King { 2318d021c344SAndy King misc_deregister(&vsock_device); 2319d021c344SAndy King sock_unregister(AF_VSOCK); 2320d021c344SAndy King proto_unregister(&vsock_proto); 2321d021c344SAndy King } 2322d021c344SAndy King 2323daabfbcaSStefano Garzarella const struct vsock_transport *vsock_core_get_transport(struct vsock_sock *vsk) 23240b01aeb3SStefan Hajnoczi { 2325daabfbcaSStefano Garzarella return vsk->transport; 23260b01aeb3SStefan Hajnoczi } 23270b01aeb3SStefan Hajnoczi EXPORT_SYMBOL_GPL(vsock_core_get_transport); 23280b01aeb3SStefan Hajnoczi 2329c0cfa2d8SStefano Garzarella int vsock_core_register(const struct vsock_transport *t, int features) 233005e489b1SStefan Hajnoczi { 23310e121905SStefano Garzarella const struct vsock_transport *t_h2g, *t_g2h, *t_dgram, *t_local; 2332c0cfa2d8SStefano Garzarella int err = mutex_lock_interruptible(&vsock_register_mutex); 2333c0cfa2d8SStefano Garzarella 2334c0cfa2d8SStefano Garzarella if (err) 2335c0cfa2d8SStefano Garzarella return err; 2336c0cfa2d8SStefano Garzarella 2337c0cfa2d8SStefano Garzarella t_h2g = transport_h2g; 2338c0cfa2d8SStefano Garzarella t_g2h = transport_g2h; 2339c0cfa2d8SStefano Garzarella t_dgram = transport_dgram; 23400e121905SStefano Garzarella t_local = transport_local; 2341c0cfa2d8SStefano Garzarella 2342c0cfa2d8SStefano Garzarella if (features & VSOCK_TRANSPORT_F_H2G) { 2343c0cfa2d8SStefano Garzarella if (t_h2g) { 2344c0cfa2d8SStefano Garzarella err = -EBUSY; 2345c0cfa2d8SStefano Garzarella goto err_busy; 2346c0cfa2d8SStefano Garzarella } 2347c0cfa2d8SStefano Garzarella t_h2g = t; 234805e489b1SStefan Hajnoczi } 234905e489b1SStefan Hajnoczi 2350c0cfa2d8SStefano Garzarella if (features & VSOCK_TRANSPORT_F_G2H) { 2351c0cfa2d8SStefano Garzarella if (t_g2h) { 2352c0cfa2d8SStefano Garzarella err = -EBUSY; 2353c0cfa2d8SStefano Garzarella goto err_busy; 2354c0cfa2d8SStefano Garzarella } 2355c0cfa2d8SStefano Garzarella t_g2h = t; 2356c0cfa2d8SStefano Garzarella } 2357c0cfa2d8SStefano Garzarella 2358c0cfa2d8SStefano Garzarella if (features & VSOCK_TRANSPORT_F_DGRAM) { 2359c0cfa2d8SStefano Garzarella if (t_dgram) { 2360c0cfa2d8SStefano Garzarella err = -EBUSY; 2361c0cfa2d8SStefano Garzarella goto err_busy; 2362c0cfa2d8SStefano Garzarella } 2363c0cfa2d8SStefano Garzarella t_dgram = t; 2364c0cfa2d8SStefano Garzarella } 2365c0cfa2d8SStefano Garzarella 23660e121905SStefano Garzarella if (features & VSOCK_TRANSPORT_F_LOCAL) { 23670e121905SStefano Garzarella if (t_local) { 23680e121905SStefano Garzarella err = -EBUSY; 23690e121905SStefano Garzarella goto err_busy; 23700e121905SStefano Garzarella } 23710e121905SStefano Garzarella t_local = t; 23720e121905SStefano Garzarella } 23730e121905SStefano Garzarella 2374c0cfa2d8SStefano Garzarella transport_h2g = t_h2g; 2375c0cfa2d8SStefano Garzarella transport_g2h = t_g2h; 2376c0cfa2d8SStefano Garzarella transport_dgram = t_dgram; 23770e121905SStefano Garzarella transport_local = t_local; 2378c0cfa2d8SStefano Garzarella 2379c0cfa2d8SStefano Garzarella err_busy: 2380c0cfa2d8SStefano Garzarella mutex_unlock(&vsock_register_mutex); 2381c0cfa2d8SStefano Garzarella return err; 2382c0cfa2d8SStefano Garzarella } 2383c0cfa2d8SStefano Garzarella EXPORT_SYMBOL_GPL(vsock_core_register); 2384c0cfa2d8SStefano Garzarella 2385c0cfa2d8SStefano Garzarella void vsock_core_unregister(const struct vsock_transport *t) 2386c0cfa2d8SStefano Garzarella { 2387c0cfa2d8SStefano Garzarella mutex_lock(&vsock_register_mutex); 2388c0cfa2d8SStefano Garzarella 2389c0cfa2d8SStefano Garzarella if (transport_h2g == t) 2390c0cfa2d8SStefano Garzarella transport_h2g = NULL; 2391c0cfa2d8SStefano Garzarella 2392c0cfa2d8SStefano Garzarella if (transport_g2h == t) 2393c0cfa2d8SStefano Garzarella transport_g2h = NULL; 2394c0cfa2d8SStefano Garzarella 2395c0cfa2d8SStefano Garzarella if (transport_dgram == t) 2396c0cfa2d8SStefano Garzarella transport_dgram = NULL; 2397c0cfa2d8SStefano Garzarella 23980e121905SStefano Garzarella if (transport_local == t) 23990e121905SStefano Garzarella transport_local = NULL; 24000e121905SStefano Garzarella 2401c0cfa2d8SStefano Garzarella mutex_unlock(&vsock_register_mutex); 2402c0cfa2d8SStefano Garzarella } 2403c0cfa2d8SStefano Garzarella EXPORT_SYMBOL_GPL(vsock_core_unregister); 2404c0cfa2d8SStefano Garzarella 2405c0cfa2d8SStefano Garzarella module_init(vsock_init); 240605e489b1SStefan Hajnoczi module_exit(vsock_exit); 2407c1eef220SCong Wang 2408d021c344SAndy King MODULE_AUTHOR("VMware, Inc."); 2409d021c344SAndy King MODULE_DESCRIPTION("VMware Virtual Socket Family"); 24101190cfdbSJorgen Hansen MODULE_VERSION("1.0.2.0-k"); 2411d021c344SAndy King MODULE_LICENSE("GPL v2"); 2412