1685a6bf8SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only 2d021c344SAndy King /* 3d021c344SAndy King * VMware vSockets Driver 4d021c344SAndy King * 5d021c344SAndy King * Copyright (C) 2007-2013 VMware, Inc. All rights reserved. 6d021c344SAndy King */ 7d021c344SAndy King 8d021c344SAndy King /* Implementation notes: 9d021c344SAndy King * 10d021c344SAndy King * - There are two kinds of sockets: those created by user action (such as 11d021c344SAndy King * calling socket(2)) and those created by incoming connection request packets. 12d021c344SAndy King * 13d021c344SAndy King * - There are two "global" tables, one for bound sockets (sockets that have 14d021c344SAndy King * specified an address that they are responsible for) and one for connected 15d021c344SAndy King * sockets (sockets that have established a connection with another socket). 16d021c344SAndy King * These tables are "global" in that all sockets on the system are placed 17d021c344SAndy King * within them. - Note, though, that the bound table contains an extra entry 18d021c344SAndy King * for a list of unbound sockets and SOCK_DGRAM sockets will always remain in 19d021c344SAndy King * that list. The bound table is used solely for lookup of sockets when packets 20d021c344SAndy King * are received and that's not necessary for SOCK_DGRAM sockets since we create 21d021c344SAndy King * a datagram handle for each and need not perform a lookup. Keeping SOCK_DGRAM 22d021c344SAndy King * sockets out of the bound hash buckets will reduce the chance of collisions 23d021c344SAndy King * when looking for SOCK_STREAM sockets and prevents us from having to check the 24d021c344SAndy King * socket type in the hash table lookups. 25d021c344SAndy King * 26d021c344SAndy King * - Sockets created by user action will either be "client" sockets that 27d021c344SAndy King * initiate a connection or "server" sockets that listen for connections; we do 28d021c344SAndy King * not support simultaneous connects (two "client" sockets connecting). 29d021c344SAndy King * 30d021c344SAndy King * - "Server" sockets are referred to as listener sockets throughout this 313b4477d2SStefan Hajnoczi * implementation because they are in the TCP_LISTEN state. When a 32ea3803c1SStefan Hajnoczi * connection request is received (the second kind of socket mentioned above), 33ea3803c1SStefan Hajnoczi * we create a new socket and refer to it as a pending socket. These pending 34ea3803c1SStefan Hajnoczi * sockets are placed on the pending connection list of the listener socket. 35ea3803c1SStefan Hajnoczi * When future packets are received for the address the listener socket is 36ea3803c1SStefan Hajnoczi * bound to, we check if the source of the packet is from one that has an 37ea3803c1SStefan Hajnoczi * existing pending connection. If it does, we process the packet for the 38ea3803c1SStefan Hajnoczi * pending socket. When that socket reaches the connected state, it is removed 39ea3803c1SStefan Hajnoczi * from the listener socket's pending list and enqueued in the listener 40ea3803c1SStefan Hajnoczi * socket's accept queue. Callers of accept(2) will accept connected sockets 41ea3803c1SStefan Hajnoczi * from the listener socket's accept queue. If the socket cannot be accepted 42ea3803c1SStefan Hajnoczi * for some reason then it is marked rejected. Once the connection is 43ea3803c1SStefan Hajnoczi * accepted, it is owned by the user process and the responsibility for cleanup 44ea3803c1SStefan Hajnoczi * falls with that user process. 45d021c344SAndy King * 46d021c344SAndy King * - It is possible that these pending sockets will never reach the connected 47d021c344SAndy King * state; in fact, we may never receive another packet after the connection 48d021c344SAndy King * request. Because of this, we must schedule a cleanup function to run in the 49d021c344SAndy King * future, after some amount of time passes where a connection should have been 50d021c344SAndy King * established. This function ensures that the socket is off all lists so it 51d021c344SAndy King * cannot be retrieved, then drops all references to the socket so it is cleaned 52d021c344SAndy King * up (sock_put() -> sk_free() -> our sk_destruct implementation). Note this 53d021c344SAndy King * function will also cleanup rejected sockets, those that reach the connected 54d021c344SAndy King * state but leave it before they have been accepted. 55d021c344SAndy King * 564192f672SStefan Hajnoczi * - Lock ordering for pending or accept queue sockets is: 574192f672SStefan Hajnoczi * 584192f672SStefan Hajnoczi * lock_sock(listener); 594192f672SStefan Hajnoczi * lock_sock_nested(pending, SINGLE_DEPTH_NESTING); 604192f672SStefan Hajnoczi * 614192f672SStefan Hajnoczi * Using explicit nested locking keeps lockdep happy since normally only one 624192f672SStefan Hajnoczi * lock of a given class may be taken at a time. 634192f672SStefan Hajnoczi * 64d021c344SAndy King * - Sockets created by user action will be cleaned up when the user process 65d021c344SAndy King * calls close(2), causing our release implementation to be called. Our release 66d021c344SAndy King * implementation will perform some cleanup then drop the last reference so our 67d021c344SAndy King * sk_destruct implementation is invoked. Our sk_destruct implementation will 68d021c344SAndy King * perform additional cleanup that's common for both types of sockets. 69d021c344SAndy King * 70d021c344SAndy King * - A socket's reference count is what ensures that the structure won't be 71d021c344SAndy King * freed. Each entry in a list (such as the "global" bound and connected tables 72d021c344SAndy King * and the listener socket's pending list and connected queue) ensures a 73d021c344SAndy King * reference. When we defer work until process context and pass a socket as our 74d021c344SAndy King * argument, we must ensure the reference count is increased to ensure the 75d021c344SAndy King * socket isn't freed before the function is run; the deferred function will 76d021c344SAndy King * then drop the reference. 773b4477d2SStefan Hajnoczi * 783b4477d2SStefan Hajnoczi * - sk->sk_state uses the TCP state constants because they are widely used by 793b4477d2SStefan Hajnoczi * other address families and exposed to userspace tools like ss(8): 803b4477d2SStefan Hajnoczi * 813b4477d2SStefan Hajnoczi * TCP_CLOSE - unconnected 823b4477d2SStefan Hajnoczi * TCP_SYN_SENT - connecting 833b4477d2SStefan Hajnoczi * TCP_ESTABLISHED - connected 843b4477d2SStefan Hajnoczi * TCP_CLOSING - disconnecting 853b4477d2SStefan Hajnoczi * TCP_LISTEN - listening 86d021c344SAndy King */ 87d021c344SAndy King 88d021c344SAndy King #include <linux/types.h> 89d021c344SAndy King #include <linux/bitops.h> 90d021c344SAndy King #include <linux/cred.h> 91d021c344SAndy King #include <linux/init.h> 92d021c344SAndy King #include <linux/io.h> 93d021c344SAndy King #include <linux/kernel.h> 94174cd4b1SIngo Molnar #include <linux/sched/signal.h> 95d021c344SAndy King #include <linux/kmod.h> 96d021c344SAndy King #include <linux/list.h> 97d021c344SAndy King #include <linux/miscdevice.h> 98d021c344SAndy King #include <linux/module.h> 99d021c344SAndy King #include <linux/mutex.h> 100d021c344SAndy King #include <linux/net.h> 101d021c344SAndy King #include <linux/poll.h> 1028236b08cSLepton Wu #include <linux/random.h> 103d021c344SAndy King #include <linux/skbuff.h> 104d021c344SAndy King #include <linux/smp.h> 105d021c344SAndy King #include <linux/socket.h> 106d021c344SAndy King #include <linux/stddef.h> 107d021c344SAndy King #include <linux/unistd.h> 108d021c344SAndy King #include <linux/wait.h> 109d021c344SAndy King #include <linux/workqueue.h> 110d021c344SAndy King #include <net/sock.h> 11182a54d0eSAsias He #include <net/af_vsock.h> 112d021c344SAndy King 113d021c344SAndy King static int __vsock_bind(struct sock *sk, struct sockaddr_vm *addr); 114d021c344SAndy King static void vsock_sk_destruct(struct sock *sk); 115d021c344SAndy King static int vsock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb); 116d021c344SAndy King 117d021c344SAndy King /* Protocol family. */ 118d021c344SAndy King static struct proto vsock_proto = { 119d021c344SAndy King .name = "AF_VSOCK", 120d021c344SAndy King .owner = THIS_MODULE, 121d021c344SAndy King .obj_size = sizeof(struct vsock_sock), 122d021c344SAndy King }; 123d021c344SAndy King 124d021c344SAndy King /* The default peer timeout indicates how long we will wait for a peer response 125d021c344SAndy King * to a control message. 126d021c344SAndy King */ 127d021c344SAndy King #define VSOCK_DEFAULT_CONNECT_TIMEOUT (2 * HZ) 128d021c344SAndy King 129b9f2b0ffSStefano Garzarella #define VSOCK_DEFAULT_BUFFER_SIZE (1024 * 256) 130b9f2b0ffSStefano Garzarella #define VSOCK_DEFAULT_BUFFER_MAX_SIZE (1024 * 256) 131b9f2b0ffSStefano Garzarella #define VSOCK_DEFAULT_BUFFER_MIN_SIZE 128 132b9f2b0ffSStefano Garzarella 133c0cfa2d8SStefano Garzarella /* Transport used for host->guest communication */ 134c0cfa2d8SStefano Garzarella static const struct vsock_transport *transport_h2g; 135c0cfa2d8SStefano Garzarella /* Transport used for guest->host communication */ 136c0cfa2d8SStefano Garzarella static const struct vsock_transport *transport_g2h; 137c0cfa2d8SStefano Garzarella /* Transport used for DGRAM communication */ 138c0cfa2d8SStefano Garzarella static const struct vsock_transport *transport_dgram; 1390e121905SStefano Garzarella /* Transport used for local communication */ 1400e121905SStefano Garzarella static const struct vsock_transport *transport_local; 141d021c344SAndy King static DEFINE_MUTEX(vsock_register_mutex); 142d021c344SAndy King 143d021c344SAndy King /**** UTILS ****/ 144d021c344SAndy King 145d021c344SAndy King /* Each bound VSocket is stored in the bind hash table and each connected 146d021c344SAndy King * VSocket is stored in the connected hash table. 147d021c344SAndy King * 148d021c344SAndy King * Unbound sockets are all put on the same list attached to the end of the hash 149d021c344SAndy King * table (vsock_unbound_sockets). Bound sockets are added to the hash table in 150d021c344SAndy King * the bucket that their local address hashes to (vsock_bound_sockets(addr) 151d021c344SAndy King * represents the list that addr hashes to). 152d021c344SAndy King * 153d021c344SAndy King * Specifically, we initialize the vsock_bind_table array to a size of 154d021c344SAndy King * VSOCK_HASH_SIZE + 1 so that vsock_bind_table[0] through 155d021c344SAndy King * vsock_bind_table[VSOCK_HASH_SIZE - 1] are for bound sockets and 156d021c344SAndy King * vsock_bind_table[VSOCK_HASH_SIZE] is for unbound sockets. The hash function 157a49dd9dcSAsias He * mods with VSOCK_HASH_SIZE to ensure this. 158d021c344SAndy King */ 159d021c344SAndy King #define MAX_PORT_RETRIES 24 160d021c344SAndy King 161a49dd9dcSAsias He #define VSOCK_HASH(addr) ((addr)->svm_port % VSOCK_HASH_SIZE) 162d021c344SAndy King #define vsock_bound_sockets(addr) (&vsock_bind_table[VSOCK_HASH(addr)]) 163d021c344SAndy King #define vsock_unbound_sockets (&vsock_bind_table[VSOCK_HASH_SIZE]) 164d021c344SAndy King 165d021c344SAndy King /* XXX This can probably be implemented in a better way. */ 166d021c344SAndy King #define VSOCK_CONN_HASH(src, dst) \ 167a49dd9dcSAsias He (((src)->svm_cid ^ (dst)->svm_port) % VSOCK_HASH_SIZE) 168d021c344SAndy King #define vsock_connected_sockets(src, dst) \ 169d021c344SAndy King (&vsock_connected_table[VSOCK_CONN_HASH(src, dst)]) 170d021c344SAndy King #define vsock_connected_sockets_vsk(vsk) \ 171d021c344SAndy King vsock_connected_sockets(&(vsk)->remote_addr, &(vsk)->local_addr) 172d021c344SAndy King 17344f20980SStefan Hajnoczi struct list_head vsock_bind_table[VSOCK_HASH_SIZE + 1]; 17444f20980SStefan Hajnoczi EXPORT_SYMBOL_GPL(vsock_bind_table); 17544f20980SStefan Hajnoczi struct list_head vsock_connected_table[VSOCK_HASH_SIZE]; 17644f20980SStefan Hajnoczi EXPORT_SYMBOL_GPL(vsock_connected_table); 17744f20980SStefan Hajnoczi DEFINE_SPINLOCK(vsock_table_lock); 17844f20980SStefan Hajnoczi EXPORT_SYMBOL_GPL(vsock_table_lock); 179d021c344SAndy King 180b3a6dfe8SAsias He /* Autobind this socket to the local address if necessary. */ 181b3a6dfe8SAsias He static int vsock_auto_bind(struct vsock_sock *vsk) 182b3a6dfe8SAsias He { 183b3a6dfe8SAsias He struct sock *sk = sk_vsock(vsk); 184b3a6dfe8SAsias He struct sockaddr_vm local_addr; 185b3a6dfe8SAsias He 186b3a6dfe8SAsias He if (vsock_addr_bound(&vsk->local_addr)) 187b3a6dfe8SAsias He return 0; 188b3a6dfe8SAsias He vsock_addr_init(&local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); 189b3a6dfe8SAsias He return __vsock_bind(sk, &local_addr); 190b3a6dfe8SAsias He } 191b3a6dfe8SAsias He 192c0cfa2d8SStefano Garzarella static void vsock_init_tables(void) 193d021c344SAndy King { 194d021c344SAndy King int i; 195d021c344SAndy King 196d021c344SAndy King for (i = 0; i < ARRAY_SIZE(vsock_bind_table); i++) 197d021c344SAndy King INIT_LIST_HEAD(&vsock_bind_table[i]); 198d021c344SAndy King 199d021c344SAndy King for (i = 0; i < ARRAY_SIZE(vsock_connected_table); i++) 200d021c344SAndy King INIT_LIST_HEAD(&vsock_connected_table[i]); 201d021c344SAndy King } 202d021c344SAndy King 203d021c344SAndy King static void __vsock_insert_bound(struct list_head *list, 204d021c344SAndy King struct vsock_sock *vsk) 205d021c344SAndy King { 206d021c344SAndy King sock_hold(&vsk->sk); 207d021c344SAndy King list_add(&vsk->bound_table, list); 208d021c344SAndy King } 209d021c344SAndy King 210d021c344SAndy King static void __vsock_insert_connected(struct list_head *list, 211d021c344SAndy King struct vsock_sock *vsk) 212d021c344SAndy King { 213d021c344SAndy King sock_hold(&vsk->sk); 214d021c344SAndy King list_add(&vsk->connected_table, list); 215d021c344SAndy King } 216d021c344SAndy King 217d021c344SAndy King static void __vsock_remove_bound(struct vsock_sock *vsk) 218d021c344SAndy King { 219d021c344SAndy King list_del_init(&vsk->bound_table); 220d021c344SAndy King sock_put(&vsk->sk); 221d021c344SAndy King } 222d021c344SAndy King 223d021c344SAndy King static void __vsock_remove_connected(struct vsock_sock *vsk) 224d021c344SAndy King { 225d021c344SAndy King list_del_init(&vsk->connected_table); 226d021c344SAndy King sock_put(&vsk->sk); 227d021c344SAndy King } 228d021c344SAndy King 229d021c344SAndy King static struct sock *__vsock_find_bound_socket(struct sockaddr_vm *addr) 230d021c344SAndy King { 231d021c344SAndy King struct vsock_sock *vsk; 232d021c344SAndy King 23336c5b48bSStefano Garzarella list_for_each_entry(vsk, vsock_bound_sockets(addr), bound_table) { 23436c5b48bSStefano Garzarella if (vsock_addr_equals_addr(addr, &vsk->local_addr)) 235d021c344SAndy King return sk_vsock(vsk); 236d021c344SAndy King 23736c5b48bSStefano Garzarella if (addr->svm_port == vsk->local_addr.svm_port && 23836c5b48bSStefano Garzarella (vsk->local_addr.svm_cid == VMADDR_CID_ANY || 23936c5b48bSStefano Garzarella addr->svm_cid == VMADDR_CID_ANY)) 24036c5b48bSStefano Garzarella return sk_vsock(vsk); 24136c5b48bSStefano Garzarella } 24236c5b48bSStefano Garzarella 243d021c344SAndy King return NULL; 244d021c344SAndy King } 245d021c344SAndy King 246d021c344SAndy King static struct sock *__vsock_find_connected_socket(struct sockaddr_vm *src, 247d021c344SAndy King struct sockaddr_vm *dst) 248d021c344SAndy King { 249d021c344SAndy King struct vsock_sock *vsk; 250d021c344SAndy King 251d021c344SAndy King list_for_each_entry(vsk, vsock_connected_sockets(src, dst), 252d021c344SAndy King connected_table) { 253990454b5SReilly Grant if (vsock_addr_equals_addr(src, &vsk->remote_addr) && 254990454b5SReilly Grant dst->svm_port == vsk->local_addr.svm_port) { 255d021c344SAndy King return sk_vsock(vsk); 256d021c344SAndy King } 257d021c344SAndy King } 258d021c344SAndy King 259d021c344SAndy King return NULL; 260d021c344SAndy King } 261d021c344SAndy King 262d021c344SAndy King static void vsock_insert_unbound(struct vsock_sock *vsk) 263d021c344SAndy King { 264d021c344SAndy King spin_lock_bh(&vsock_table_lock); 265d021c344SAndy King __vsock_insert_bound(vsock_unbound_sockets, vsk); 266d021c344SAndy King spin_unlock_bh(&vsock_table_lock); 267d021c344SAndy King } 268d021c344SAndy King 269d021c344SAndy King void vsock_insert_connected(struct vsock_sock *vsk) 270d021c344SAndy King { 271d021c344SAndy King struct list_head *list = vsock_connected_sockets( 272d021c344SAndy King &vsk->remote_addr, &vsk->local_addr); 273d021c344SAndy King 274d021c344SAndy King spin_lock_bh(&vsock_table_lock); 275d021c344SAndy King __vsock_insert_connected(list, vsk); 276d021c344SAndy King spin_unlock_bh(&vsock_table_lock); 277d021c344SAndy King } 278d021c344SAndy King EXPORT_SYMBOL_GPL(vsock_insert_connected); 279d021c344SAndy King 280d021c344SAndy King void vsock_remove_bound(struct vsock_sock *vsk) 281d021c344SAndy King { 282d021c344SAndy King spin_lock_bh(&vsock_table_lock); 283d5afa82cSSunil Muthuswamy if (__vsock_in_bound_table(vsk)) 284d021c344SAndy King __vsock_remove_bound(vsk); 285d021c344SAndy King spin_unlock_bh(&vsock_table_lock); 286d021c344SAndy King } 287d021c344SAndy King EXPORT_SYMBOL_GPL(vsock_remove_bound); 288d021c344SAndy King 289d021c344SAndy King void vsock_remove_connected(struct vsock_sock *vsk) 290d021c344SAndy King { 291d021c344SAndy King spin_lock_bh(&vsock_table_lock); 292d5afa82cSSunil Muthuswamy if (__vsock_in_connected_table(vsk)) 293d021c344SAndy King __vsock_remove_connected(vsk); 294d021c344SAndy King spin_unlock_bh(&vsock_table_lock); 295d021c344SAndy King } 296d021c344SAndy King EXPORT_SYMBOL_GPL(vsock_remove_connected); 297d021c344SAndy King 298d021c344SAndy King struct sock *vsock_find_bound_socket(struct sockaddr_vm *addr) 299d021c344SAndy King { 300d021c344SAndy King struct sock *sk; 301d021c344SAndy King 302d021c344SAndy King spin_lock_bh(&vsock_table_lock); 303d021c344SAndy King sk = __vsock_find_bound_socket(addr); 304d021c344SAndy King if (sk) 305d021c344SAndy King sock_hold(sk); 306d021c344SAndy King 307d021c344SAndy King spin_unlock_bh(&vsock_table_lock); 308d021c344SAndy King 309d021c344SAndy King return sk; 310d021c344SAndy King } 311d021c344SAndy King EXPORT_SYMBOL_GPL(vsock_find_bound_socket); 312d021c344SAndy King 313d021c344SAndy King struct sock *vsock_find_connected_socket(struct sockaddr_vm *src, 314d021c344SAndy King struct sockaddr_vm *dst) 315d021c344SAndy King { 316d021c344SAndy King struct sock *sk; 317d021c344SAndy King 318d021c344SAndy King spin_lock_bh(&vsock_table_lock); 319d021c344SAndy King sk = __vsock_find_connected_socket(src, dst); 320d021c344SAndy King if (sk) 321d021c344SAndy King sock_hold(sk); 322d021c344SAndy King 323d021c344SAndy King spin_unlock_bh(&vsock_table_lock); 324d021c344SAndy King 325d021c344SAndy King return sk; 326d021c344SAndy King } 327d021c344SAndy King EXPORT_SYMBOL_GPL(vsock_find_connected_socket); 328d021c344SAndy King 3296773b7dcSStefan Hajnoczi void vsock_remove_sock(struct vsock_sock *vsk) 3306773b7dcSStefan Hajnoczi { 3316773b7dcSStefan Hajnoczi vsock_remove_bound(vsk); 3326773b7dcSStefan Hajnoczi vsock_remove_connected(vsk); 3336773b7dcSStefan Hajnoczi } 3346773b7dcSStefan Hajnoczi EXPORT_SYMBOL_GPL(vsock_remove_sock); 3356773b7dcSStefan Hajnoczi 336d021c344SAndy King void vsock_for_each_connected_socket(void (*fn)(struct sock *sk)) 337d021c344SAndy King { 338d021c344SAndy King int i; 339d021c344SAndy King 340d021c344SAndy King spin_lock_bh(&vsock_table_lock); 341d021c344SAndy King 342d021c344SAndy King for (i = 0; i < ARRAY_SIZE(vsock_connected_table); i++) { 343d021c344SAndy King struct vsock_sock *vsk; 344d021c344SAndy King list_for_each_entry(vsk, &vsock_connected_table[i], 345d9af2d67SJulia Lawall connected_table) 346d021c344SAndy King fn(sk_vsock(vsk)); 347d021c344SAndy King } 348d021c344SAndy King 349d021c344SAndy King spin_unlock_bh(&vsock_table_lock); 350d021c344SAndy King } 351d021c344SAndy King EXPORT_SYMBOL_GPL(vsock_for_each_connected_socket); 352d021c344SAndy King 353d021c344SAndy King void vsock_add_pending(struct sock *listener, struct sock *pending) 354d021c344SAndy King { 355d021c344SAndy King struct vsock_sock *vlistener; 356d021c344SAndy King struct vsock_sock *vpending; 357d021c344SAndy King 358d021c344SAndy King vlistener = vsock_sk(listener); 359d021c344SAndy King vpending = vsock_sk(pending); 360d021c344SAndy King 361d021c344SAndy King sock_hold(pending); 362d021c344SAndy King sock_hold(listener); 363d021c344SAndy King list_add_tail(&vpending->pending_links, &vlistener->pending_links); 364d021c344SAndy King } 365d021c344SAndy King EXPORT_SYMBOL_GPL(vsock_add_pending); 366d021c344SAndy King 367d021c344SAndy King void vsock_remove_pending(struct sock *listener, struct sock *pending) 368d021c344SAndy King { 369d021c344SAndy King struct vsock_sock *vpending = vsock_sk(pending); 370d021c344SAndy King 371d021c344SAndy King list_del_init(&vpending->pending_links); 372d021c344SAndy King sock_put(listener); 373d021c344SAndy King sock_put(pending); 374d021c344SAndy King } 375d021c344SAndy King EXPORT_SYMBOL_GPL(vsock_remove_pending); 376d021c344SAndy King 377d021c344SAndy King void vsock_enqueue_accept(struct sock *listener, struct sock *connected) 378d021c344SAndy King { 379d021c344SAndy King struct vsock_sock *vlistener; 380d021c344SAndy King struct vsock_sock *vconnected; 381d021c344SAndy King 382d021c344SAndy King vlistener = vsock_sk(listener); 383d021c344SAndy King vconnected = vsock_sk(connected); 384d021c344SAndy King 385d021c344SAndy King sock_hold(connected); 386d021c344SAndy King sock_hold(listener); 387d021c344SAndy King list_add_tail(&vconnected->accept_queue, &vlistener->accept_queue); 388d021c344SAndy King } 389d021c344SAndy King EXPORT_SYMBOL_GPL(vsock_enqueue_accept); 390d021c344SAndy King 391408624afSStefano Garzarella static bool vsock_use_local_transport(unsigned int remote_cid) 392408624afSStefano Garzarella { 393408624afSStefano Garzarella if (!transport_local) 394408624afSStefano Garzarella return false; 395408624afSStefano Garzarella 396408624afSStefano Garzarella if (remote_cid == VMADDR_CID_LOCAL) 397408624afSStefano Garzarella return true; 398408624afSStefano Garzarella 399408624afSStefano Garzarella if (transport_g2h) { 400408624afSStefano Garzarella return remote_cid == transport_g2h->get_local_cid(); 401408624afSStefano Garzarella } else { 402408624afSStefano Garzarella return remote_cid == VMADDR_CID_HOST; 403408624afSStefano Garzarella } 404408624afSStefano Garzarella } 405408624afSStefano Garzarella 4066a2c0962SStefano Garzarella static void vsock_deassign_transport(struct vsock_sock *vsk) 4076a2c0962SStefano Garzarella { 4086a2c0962SStefano Garzarella if (!vsk->transport) 4096a2c0962SStefano Garzarella return; 4106a2c0962SStefano Garzarella 4116a2c0962SStefano Garzarella vsk->transport->destruct(vsk); 4126a2c0962SStefano Garzarella module_put(vsk->transport->module); 4136a2c0962SStefano Garzarella vsk->transport = NULL; 4146a2c0962SStefano Garzarella } 4156a2c0962SStefano Garzarella 416c0cfa2d8SStefano Garzarella /* Assign a transport to a socket and call the .init transport callback. 417c0cfa2d8SStefano Garzarella * 418c0cfa2d8SStefano Garzarella * Note: for stream socket this must be called when vsk->remote_addr is set 419c0cfa2d8SStefano Garzarella * (e.g. during the connect() or when a connection request on a listener 420c0cfa2d8SStefano Garzarella * socket is received). 421c0cfa2d8SStefano Garzarella * The vsk->remote_addr is used to decide which transport to use: 422408624afSStefano Garzarella * - remote CID == VMADDR_CID_LOCAL or g2h->local_cid or VMADDR_CID_HOST if 423408624afSStefano Garzarella * g2h is not loaded, will use local transport; 4247f816984SAndra Paraschiv * - remote CID <= VMADDR_CID_HOST or h2g is not loaded or remote flags field 4257f816984SAndra Paraschiv * includes VMADDR_FLAG_TO_HOST flag value, will use guest->host transport; 426c0cfa2d8SStefano Garzarella * - remote CID > VMADDR_CID_HOST will use host->guest transport; 427c0cfa2d8SStefano Garzarella */ 428c0cfa2d8SStefano Garzarella int vsock_assign_transport(struct vsock_sock *vsk, struct vsock_sock *psk) 429c0cfa2d8SStefano Garzarella { 430c0cfa2d8SStefano Garzarella const struct vsock_transport *new_transport; 431c0cfa2d8SStefano Garzarella struct sock *sk = sk_vsock(vsk); 432c0cfa2d8SStefano Garzarella unsigned int remote_cid = vsk->remote_addr.svm_cid; 4337f816984SAndra Paraschiv __u8 remote_flags; 434039fcccaSStefano Garzarella int ret; 435c0cfa2d8SStefano Garzarella 4361b5f2ab9SAndra Paraschiv /* If the packet is coming with the source and destination CIDs higher 4371b5f2ab9SAndra Paraschiv * than VMADDR_CID_HOST, then a vsock channel where all the packets are 4381b5f2ab9SAndra Paraschiv * forwarded to the host should be established. Then the host will 4391b5f2ab9SAndra Paraschiv * need to forward the packets to the guest. 4401b5f2ab9SAndra Paraschiv * 4411b5f2ab9SAndra Paraschiv * The flag is set on the (listen) receive path (psk is not NULL). On 4421b5f2ab9SAndra Paraschiv * the connect path the flag can be set by the user space application. 4431b5f2ab9SAndra Paraschiv */ 4441b5f2ab9SAndra Paraschiv if (psk && vsk->local_addr.svm_cid > VMADDR_CID_HOST && 4451b5f2ab9SAndra Paraschiv vsk->remote_addr.svm_cid > VMADDR_CID_HOST) 4461b5f2ab9SAndra Paraschiv vsk->remote_addr.svm_flags |= VMADDR_FLAG_TO_HOST; 4471b5f2ab9SAndra Paraschiv 4487f816984SAndra Paraschiv remote_flags = vsk->remote_addr.svm_flags; 4497f816984SAndra Paraschiv 450c0cfa2d8SStefano Garzarella switch (sk->sk_type) { 451c0cfa2d8SStefano Garzarella case SOCK_DGRAM: 452c0cfa2d8SStefano Garzarella new_transport = transport_dgram; 453c0cfa2d8SStefano Garzarella break; 454c0cfa2d8SStefano Garzarella case SOCK_STREAM: 455*0798e78bSArseny Krasnov case SOCK_SEQPACKET: 456408624afSStefano Garzarella if (vsock_use_local_transport(remote_cid)) 457408624afSStefano Garzarella new_transport = transport_local; 4587f816984SAndra Paraschiv else if (remote_cid <= VMADDR_CID_HOST || !transport_h2g || 4597f816984SAndra Paraschiv (remote_flags & VMADDR_FLAG_TO_HOST)) 460c0cfa2d8SStefano Garzarella new_transport = transport_g2h; 461c0cfa2d8SStefano Garzarella else 462c0cfa2d8SStefano Garzarella new_transport = transport_h2g; 463c0cfa2d8SStefano Garzarella break; 464c0cfa2d8SStefano Garzarella default: 465c0cfa2d8SStefano Garzarella return -ESOCKTNOSUPPORT; 466c0cfa2d8SStefano Garzarella } 467c0cfa2d8SStefano Garzarella 468c0cfa2d8SStefano Garzarella if (vsk->transport) { 469c0cfa2d8SStefano Garzarella if (vsk->transport == new_transport) 470c0cfa2d8SStefano Garzarella return 0; 471c0cfa2d8SStefano Garzarella 4723f74957fSStefano Garzarella /* transport->release() must be called with sock lock acquired. 4733f74957fSStefano Garzarella * This path can only be taken during vsock_stream_connect(), 4743f74957fSStefano Garzarella * where we have already held the sock lock. 4753f74957fSStefano Garzarella * In the other cases, this function is called on a new socket 4763f74957fSStefano Garzarella * which is not assigned to any transport. 4773f74957fSStefano Garzarella */ 478c0cfa2d8SStefano Garzarella vsk->transport->release(vsk); 4796a2c0962SStefano Garzarella vsock_deassign_transport(vsk); 480c0cfa2d8SStefano Garzarella } 481c0cfa2d8SStefano Garzarella 4826a2c0962SStefano Garzarella /* We increase the module refcnt to prevent the transport unloading 4836a2c0962SStefano Garzarella * while there are open sockets assigned to it. 4846a2c0962SStefano Garzarella */ 4856a2c0962SStefano Garzarella if (!new_transport || !try_module_get(new_transport->module)) 486c0cfa2d8SStefano Garzarella return -ENODEV; 487c0cfa2d8SStefano Garzarella 488*0798e78bSArseny Krasnov if (sk->sk_type == SOCK_SEQPACKET) { 489*0798e78bSArseny Krasnov if (!new_transport->seqpacket_allow || 490*0798e78bSArseny Krasnov !new_transport->seqpacket_allow(remote_cid)) { 491*0798e78bSArseny Krasnov module_put(new_transport->module); 492*0798e78bSArseny Krasnov return -ESOCKTNOSUPPORT; 493*0798e78bSArseny Krasnov } 494*0798e78bSArseny Krasnov } 495*0798e78bSArseny Krasnov 496039fcccaSStefano Garzarella ret = new_transport->init(vsk, psk); 497039fcccaSStefano Garzarella if (ret) { 498039fcccaSStefano Garzarella module_put(new_transport->module); 499039fcccaSStefano Garzarella return ret; 500039fcccaSStefano Garzarella } 501039fcccaSStefano Garzarella 502c0cfa2d8SStefano Garzarella vsk->transport = new_transport; 503c0cfa2d8SStefano Garzarella 504039fcccaSStefano Garzarella return 0; 505c0cfa2d8SStefano Garzarella } 506c0cfa2d8SStefano Garzarella EXPORT_SYMBOL_GPL(vsock_assign_transport); 507c0cfa2d8SStefano Garzarella 508c0cfa2d8SStefano Garzarella bool vsock_find_cid(unsigned int cid) 509c0cfa2d8SStefano Garzarella { 510c0cfa2d8SStefano Garzarella if (transport_g2h && cid == transport_g2h->get_local_cid()) 511c0cfa2d8SStefano Garzarella return true; 512c0cfa2d8SStefano Garzarella 513c0cfa2d8SStefano Garzarella if (transport_h2g && cid == VMADDR_CID_HOST) 514c0cfa2d8SStefano Garzarella return true; 515c0cfa2d8SStefano Garzarella 516408624afSStefano Garzarella if (transport_local && cid == VMADDR_CID_LOCAL) 517408624afSStefano Garzarella return true; 518408624afSStefano Garzarella 519c0cfa2d8SStefano Garzarella return false; 520c0cfa2d8SStefano Garzarella } 521c0cfa2d8SStefano Garzarella EXPORT_SYMBOL_GPL(vsock_find_cid); 522c0cfa2d8SStefano Garzarella 523d021c344SAndy King static struct sock *vsock_dequeue_accept(struct sock *listener) 524d021c344SAndy King { 525d021c344SAndy King struct vsock_sock *vlistener; 526d021c344SAndy King struct vsock_sock *vconnected; 527d021c344SAndy King 528d021c344SAndy King vlistener = vsock_sk(listener); 529d021c344SAndy King 530d021c344SAndy King if (list_empty(&vlistener->accept_queue)) 531d021c344SAndy King return NULL; 532d021c344SAndy King 533d021c344SAndy King vconnected = list_entry(vlistener->accept_queue.next, 534d021c344SAndy King struct vsock_sock, accept_queue); 535d021c344SAndy King 536d021c344SAndy King list_del_init(&vconnected->accept_queue); 537d021c344SAndy King sock_put(listener); 538d021c344SAndy King /* The caller will need a reference on the connected socket so we let 539d021c344SAndy King * it call sock_put(). 540d021c344SAndy King */ 541d021c344SAndy King 542d021c344SAndy King return sk_vsock(vconnected); 543d021c344SAndy King } 544d021c344SAndy King 545d021c344SAndy King static bool vsock_is_accept_queue_empty(struct sock *sk) 546d021c344SAndy King { 547d021c344SAndy King struct vsock_sock *vsk = vsock_sk(sk); 548d021c344SAndy King return list_empty(&vsk->accept_queue); 549d021c344SAndy King } 550d021c344SAndy King 551d021c344SAndy King static bool vsock_is_pending(struct sock *sk) 552d021c344SAndy King { 553d021c344SAndy King struct vsock_sock *vsk = vsock_sk(sk); 554d021c344SAndy King return !list_empty(&vsk->pending_links); 555d021c344SAndy King } 556d021c344SAndy King 557d021c344SAndy King static int vsock_send_shutdown(struct sock *sk, int mode) 558d021c344SAndy King { 559fe502c4aSStefano Garzarella struct vsock_sock *vsk = vsock_sk(sk); 560fe502c4aSStefano Garzarella 561c0cfa2d8SStefano Garzarella if (!vsk->transport) 562c0cfa2d8SStefano Garzarella return -ENODEV; 563c0cfa2d8SStefano Garzarella 564fe502c4aSStefano Garzarella return vsk->transport->shutdown(vsk, mode); 565d021c344SAndy King } 566d021c344SAndy King 567455f05ecSCong Wang static void vsock_pending_work(struct work_struct *work) 568d021c344SAndy King { 569d021c344SAndy King struct sock *sk; 570d021c344SAndy King struct sock *listener; 571d021c344SAndy King struct vsock_sock *vsk; 572d021c344SAndy King bool cleanup; 573d021c344SAndy King 574455f05ecSCong Wang vsk = container_of(work, struct vsock_sock, pending_work.work); 575d021c344SAndy King sk = sk_vsock(vsk); 576d021c344SAndy King listener = vsk->listener; 577d021c344SAndy King cleanup = true; 578d021c344SAndy King 579d021c344SAndy King lock_sock(listener); 5804192f672SStefan Hajnoczi lock_sock_nested(sk, SINGLE_DEPTH_NESTING); 581d021c344SAndy King 582d021c344SAndy King if (vsock_is_pending(sk)) { 583d021c344SAndy King vsock_remove_pending(listener, sk); 5841190cfdbSJorgen Hansen 5857976a11bSEric Dumazet sk_acceptq_removed(listener); 586d021c344SAndy King } else if (!vsk->rejected) { 587d021c344SAndy King /* We are not on the pending list and accept() did not reject 588d021c344SAndy King * us, so we must have been accepted by our user process. We 589d021c344SAndy King * just need to drop our references to the sockets and be on 590d021c344SAndy King * our way. 591d021c344SAndy King */ 592d021c344SAndy King cleanup = false; 593d021c344SAndy King goto out; 594d021c344SAndy King } 595d021c344SAndy King 596d021c344SAndy King /* We need to remove ourself from the global connected sockets list so 597d021c344SAndy King * incoming packets can't find this socket, and to reduce the reference 598d021c344SAndy King * count. 599d021c344SAndy King */ 600d021c344SAndy King vsock_remove_connected(vsk); 601d021c344SAndy King 6023b4477d2SStefan Hajnoczi sk->sk_state = TCP_CLOSE; 603d021c344SAndy King 604d021c344SAndy King out: 605d021c344SAndy King release_sock(sk); 606d021c344SAndy King release_sock(listener); 607d021c344SAndy King if (cleanup) 608d021c344SAndy King sock_put(sk); 609d021c344SAndy King 610d021c344SAndy King sock_put(sk); 611d021c344SAndy King sock_put(listener); 612d021c344SAndy King } 613d021c344SAndy King 614d021c344SAndy King /**** SOCKET OPERATIONS ****/ 615d021c344SAndy King 616a9e29e55SArseny Krasnov static int __vsock_bind_connectible(struct vsock_sock *vsk, 617d021c344SAndy King struct sockaddr_vm *addr) 618d021c344SAndy King { 619a22d3251SLepton Wu static u32 port; 620d021c344SAndy King struct sockaddr_vm new_addr; 621d021c344SAndy King 6228236b08cSLepton Wu if (!port) 6238236b08cSLepton Wu port = LAST_RESERVED_PORT + 1 + 6248236b08cSLepton Wu prandom_u32_max(U32_MAX - LAST_RESERVED_PORT); 6258236b08cSLepton Wu 626d021c344SAndy King vsock_addr_init(&new_addr, addr->svm_cid, addr->svm_port); 627d021c344SAndy King 628d021c344SAndy King if (addr->svm_port == VMADDR_PORT_ANY) { 629d021c344SAndy King bool found = false; 630d021c344SAndy King unsigned int i; 631d021c344SAndy King 632d021c344SAndy King for (i = 0; i < MAX_PORT_RETRIES; i++) { 633d021c344SAndy King if (port <= LAST_RESERVED_PORT) 634d021c344SAndy King port = LAST_RESERVED_PORT + 1; 635d021c344SAndy King 636d021c344SAndy King new_addr.svm_port = port++; 637d021c344SAndy King 638d021c344SAndy King if (!__vsock_find_bound_socket(&new_addr)) { 639d021c344SAndy King found = true; 640d021c344SAndy King break; 641d021c344SAndy King } 642d021c344SAndy King } 643d021c344SAndy King 644d021c344SAndy King if (!found) 645d021c344SAndy King return -EADDRNOTAVAIL; 646d021c344SAndy King } else { 647d021c344SAndy King /* If port is in reserved range, ensure caller 648d021c344SAndy King * has necessary privileges. 649d021c344SAndy King */ 650d021c344SAndy King if (addr->svm_port <= LAST_RESERVED_PORT && 651d021c344SAndy King !capable(CAP_NET_BIND_SERVICE)) { 652d021c344SAndy King return -EACCES; 653d021c344SAndy King } 654d021c344SAndy King 655d021c344SAndy King if (__vsock_find_bound_socket(&new_addr)) 656d021c344SAndy King return -EADDRINUSE; 657d021c344SAndy King } 658d021c344SAndy King 659d021c344SAndy King vsock_addr_init(&vsk->local_addr, new_addr.svm_cid, new_addr.svm_port); 660d021c344SAndy King 661d021c344SAndy King /* Remove stream sockets from the unbound list and add them to the hash 662d021c344SAndy King * table for easy lookup by its address. The unbound list is simply an 663d021c344SAndy King * extra entry at the end of the hash table, a trick used by AF_UNIX. 664d021c344SAndy King */ 665d021c344SAndy King __vsock_remove_bound(vsk); 666d021c344SAndy King __vsock_insert_bound(vsock_bound_sockets(&vsk->local_addr), vsk); 667d021c344SAndy King 668d021c344SAndy King return 0; 669d021c344SAndy King } 670d021c344SAndy King 671d021c344SAndy King static int __vsock_bind_dgram(struct vsock_sock *vsk, 672d021c344SAndy King struct sockaddr_vm *addr) 673d021c344SAndy King { 674fe502c4aSStefano Garzarella return vsk->transport->dgram_bind(vsk, addr); 675d021c344SAndy King } 676d021c344SAndy King 677d021c344SAndy King static int __vsock_bind(struct sock *sk, struct sockaddr_vm *addr) 678d021c344SAndy King { 679d021c344SAndy King struct vsock_sock *vsk = vsock_sk(sk); 680d021c344SAndy King int retval; 681d021c344SAndy King 682d021c344SAndy King /* First ensure this socket isn't already bound. */ 683d021c344SAndy King if (vsock_addr_bound(&vsk->local_addr)) 684d021c344SAndy King return -EINVAL; 685d021c344SAndy King 686d021c344SAndy King /* Now bind to the provided address or select appropriate values if 687d021c344SAndy King * none are provided (VMADDR_CID_ANY and VMADDR_PORT_ANY). Note that 688d021c344SAndy King * like AF_INET prevents binding to a non-local IP address (in most 689c0cfa2d8SStefano Garzarella * cases), we only allow binding to a local CID. 690d021c344SAndy King */ 691c0cfa2d8SStefano Garzarella if (addr->svm_cid != VMADDR_CID_ANY && !vsock_find_cid(addr->svm_cid)) 692d021c344SAndy King return -EADDRNOTAVAIL; 693d021c344SAndy King 694d021c344SAndy King switch (sk->sk_socket->type) { 695d021c344SAndy King case SOCK_STREAM: 696*0798e78bSArseny Krasnov case SOCK_SEQPACKET: 697d021c344SAndy King spin_lock_bh(&vsock_table_lock); 698a9e29e55SArseny Krasnov retval = __vsock_bind_connectible(vsk, addr); 699d021c344SAndy King spin_unlock_bh(&vsock_table_lock); 700d021c344SAndy King break; 701d021c344SAndy King 702d021c344SAndy King case SOCK_DGRAM: 703d021c344SAndy King retval = __vsock_bind_dgram(vsk, addr); 704d021c344SAndy King break; 705d021c344SAndy King 706d021c344SAndy King default: 707d021c344SAndy King retval = -EINVAL; 708d021c344SAndy King break; 709d021c344SAndy King } 710d021c344SAndy King 711d021c344SAndy King return retval; 712d021c344SAndy King } 713d021c344SAndy King 714455f05ecSCong Wang static void vsock_connect_timeout(struct work_struct *work); 715455f05ecSCong Wang 716b9ca2f5fSStefano Garzarella static struct sock *__vsock_create(struct net *net, 717d021c344SAndy King struct socket *sock, 718d021c344SAndy King struct sock *parent, 719d021c344SAndy King gfp_t priority, 72011aa9c28SEric W. Biederman unsigned short type, 72111aa9c28SEric W. Biederman int kern) 722d021c344SAndy King { 723d021c344SAndy King struct sock *sk; 724d021c344SAndy King struct vsock_sock *psk; 725d021c344SAndy King struct vsock_sock *vsk; 726d021c344SAndy King 72711aa9c28SEric W. Biederman sk = sk_alloc(net, AF_VSOCK, priority, &vsock_proto, kern); 728d021c344SAndy King if (!sk) 729d021c344SAndy King return NULL; 730d021c344SAndy King 731d021c344SAndy King sock_init_data(sock, sk); 732d021c344SAndy King 733d021c344SAndy King /* sk->sk_type is normally set in sock_init_data, but only if sock is 734d021c344SAndy King * non-NULL. We make sure that our sockets always have a type by 735d021c344SAndy King * setting it here if needed. 736d021c344SAndy King */ 737d021c344SAndy King if (!sock) 738d021c344SAndy King sk->sk_type = type; 739d021c344SAndy King 740d021c344SAndy King vsk = vsock_sk(sk); 741d021c344SAndy King vsock_addr_init(&vsk->local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); 742d021c344SAndy King vsock_addr_init(&vsk->remote_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); 743d021c344SAndy King 744d021c344SAndy King sk->sk_destruct = vsock_sk_destruct; 745d021c344SAndy King sk->sk_backlog_rcv = vsock_queue_rcv_skb; 746d021c344SAndy King sock_reset_flag(sk, SOCK_DONE); 747d021c344SAndy King 748d021c344SAndy King INIT_LIST_HEAD(&vsk->bound_table); 749d021c344SAndy King INIT_LIST_HEAD(&vsk->connected_table); 750d021c344SAndy King vsk->listener = NULL; 751d021c344SAndy King INIT_LIST_HEAD(&vsk->pending_links); 752d021c344SAndy King INIT_LIST_HEAD(&vsk->accept_queue); 753d021c344SAndy King vsk->rejected = false; 754d021c344SAndy King vsk->sent_request = false; 755d021c344SAndy King vsk->ignore_connecting_rst = false; 756d021c344SAndy King vsk->peer_shutdown = 0; 757455f05ecSCong Wang INIT_DELAYED_WORK(&vsk->connect_work, vsock_connect_timeout); 758455f05ecSCong Wang INIT_DELAYED_WORK(&vsk->pending_work, vsock_pending_work); 759d021c344SAndy King 760d021c344SAndy King psk = parent ? vsock_sk(parent) : NULL; 761d021c344SAndy King if (parent) { 762d021c344SAndy King vsk->trusted = psk->trusted; 763d021c344SAndy King vsk->owner = get_cred(psk->owner); 764d021c344SAndy King vsk->connect_timeout = psk->connect_timeout; 765b9f2b0ffSStefano Garzarella vsk->buffer_size = psk->buffer_size; 766b9f2b0ffSStefano Garzarella vsk->buffer_min_size = psk->buffer_min_size; 767b9f2b0ffSStefano Garzarella vsk->buffer_max_size = psk->buffer_max_size; 7681f935e8eSDavid Brazdil security_sk_clone(parent, sk); 769d021c344SAndy King } else { 770af545bb5SJeff Vander Stoep vsk->trusted = ns_capable_noaudit(&init_user_ns, CAP_NET_ADMIN); 771d021c344SAndy King vsk->owner = get_current_cred(); 772d021c344SAndy King vsk->connect_timeout = VSOCK_DEFAULT_CONNECT_TIMEOUT; 773b9f2b0ffSStefano Garzarella vsk->buffer_size = VSOCK_DEFAULT_BUFFER_SIZE; 774b9f2b0ffSStefano Garzarella vsk->buffer_min_size = VSOCK_DEFAULT_BUFFER_MIN_SIZE; 775b9f2b0ffSStefano Garzarella vsk->buffer_max_size = VSOCK_DEFAULT_BUFFER_MAX_SIZE; 776d021c344SAndy King } 777d021c344SAndy King 778d021c344SAndy King return sk; 779d021c344SAndy King } 780d021c344SAndy King 781a9e29e55SArseny Krasnov static bool sock_type_connectible(u16 type) 782a9e29e55SArseny Krasnov { 783*0798e78bSArseny Krasnov return (type == SOCK_STREAM) || (type == SOCK_SEQPACKET); 784a9e29e55SArseny Krasnov } 785a9e29e55SArseny Krasnov 7860d9138ffSDexuan Cui static void __vsock_release(struct sock *sk, int level) 787d021c344SAndy King { 788d021c344SAndy King if (sk) { 789d021c344SAndy King struct sock *pending; 790d021c344SAndy King struct vsock_sock *vsk; 791d021c344SAndy King 792d021c344SAndy King vsk = vsock_sk(sk); 793d021c344SAndy King pending = NULL; /* Compiler warning. */ 794d021c344SAndy King 7950d9138ffSDexuan Cui /* When "level" is SINGLE_DEPTH_NESTING, use the nested 7960d9138ffSDexuan Cui * version to avoid the warning "possible recursive locking 7970d9138ffSDexuan Cui * detected". When "level" is 0, lock_sock_nested(sk, level) 7980d9138ffSDexuan Cui * is the same as lock_sock(sk). 7990d9138ffSDexuan Cui */ 8000d9138ffSDexuan Cui lock_sock_nested(sk, level); 8013f74957fSStefano Garzarella 8023f74957fSStefano Garzarella if (vsk->transport) 8033f74957fSStefano Garzarella vsk->transport->release(vsk); 804a9e29e55SArseny Krasnov else if (sock_type_connectible(sk->sk_type)) 8053f74957fSStefano Garzarella vsock_remove_sock(vsk); 8063f74957fSStefano Garzarella 807d021c344SAndy King sock_orphan(sk); 808d021c344SAndy King sk->sk_shutdown = SHUTDOWN_MASK; 809d021c344SAndy King 8103b7ad08bSChristophe JAILLET skb_queue_purge(&sk->sk_receive_queue); 811d021c344SAndy King 812d021c344SAndy King /* Clean up any sockets that never were accepted. */ 813d021c344SAndy King while ((pending = vsock_dequeue_accept(sk)) != NULL) { 8140d9138ffSDexuan Cui __vsock_release(pending, SINGLE_DEPTH_NESTING); 815d021c344SAndy King sock_put(pending); 816d021c344SAndy King } 817d021c344SAndy King 818d021c344SAndy King release_sock(sk); 819d021c344SAndy King sock_put(sk); 820d021c344SAndy King } 821d021c344SAndy King } 822d021c344SAndy King 823d021c344SAndy King static void vsock_sk_destruct(struct sock *sk) 824d021c344SAndy King { 825d021c344SAndy King struct vsock_sock *vsk = vsock_sk(sk); 826d021c344SAndy King 8276a2c0962SStefano Garzarella vsock_deassign_transport(vsk); 828d021c344SAndy King 829d021c344SAndy King /* When clearing these addresses, there's no need to set the family and 830d021c344SAndy King * possibly register the address family with the kernel. 831d021c344SAndy King */ 832d021c344SAndy King vsock_addr_init(&vsk->local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); 833d021c344SAndy King vsock_addr_init(&vsk->remote_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); 834d021c344SAndy King 835d021c344SAndy King put_cred(vsk->owner); 836d021c344SAndy King } 837d021c344SAndy King 838d021c344SAndy King static int vsock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 839d021c344SAndy King { 840d021c344SAndy King int err; 841d021c344SAndy King 842d021c344SAndy King err = sock_queue_rcv_skb(sk, skb); 843d021c344SAndy King if (err) 844d021c344SAndy King kfree_skb(skb); 845d021c344SAndy King 846d021c344SAndy King return err; 847d021c344SAndy King } 848d021c344SAndy King 849b9ca2f5fSStefano Garzarella struct sock *vsock_create_connected(struct sock *parent) 850b9ca2f5fSStefano Garzarella { 851b9ca2f5fSStefano Garzarella return __vsock_create(sock_net(parent), NULL, parent, GFP_KERNEL, 852b9ca2f5fSStefano Garzarella parent->sk_type, 0); 853b9ca2f5fSStefano Garzarella } 854b9ca2f5fSStefano Garzarella EXPORT_SYMBOL_GPL(vsock_create_connected); 855b9ca2f5fSStefano Garzarella 856d021c344SAndy King s64 vsock_stream_has_data(struct vsock_sock *vsk) 857d021c344SAndy King { 858fe502c4aSStefano Garzarella return vsk->transport->stream_has_data(vsk); 859d021c344SAndy King } 860d021c344SAndy King EXPORT_SYMBOL_GPL(vsock_stream_has_data); 861d021c344SAndy King 862*0798e78bSArseny Krasnov static s64 vsock_has_data(struct vsock_sock *vsk) 863*0798e78bSArseny Krasnov { 864*0798e78bSArseny Krasnov struct sock *sk = sk_vsock(vsk); 865*0798e78bSArseny Krasnov 866*0798e78bSArseny Krasnov if (sk->sk_type == SOCK_SEQPACKET) 867*0798e78bSArseny Krasnov return vsk->transport->seqpacket_has_data(vsk); 868*0798e78bSArseny Krasnov else 869*0798e78bSArseny Krasnov return vsock_stream_has_data(vsk); 870*0798e78bSArseny Krasnov } 871*0798e78bSArseny Krasnov 872d021c344SAndy King s64 vsock_stream_has_space(struct vsock_sock *vsk) 873d021c344SAndy King { 874fe502c4aSStefano Garzarella return vsk->transport->stream_has_space(vsk); 875d021c344SAndy King } 876d021c344SAndy King EXPORT_SYMBOL_GPL(vsock_stream_has_space); 877d021c344SAndy King 878d021c344SAndy King static int vsock_release(struct socket *sock) 879d021c344SAndy King { 8800d9138ffSDexuan Cui __vsock_release(sock->sk, 0); 881d021c344SAndy King sock->sk = NULL; 882d021c344SAndy King sock->state = SS_FREE; 883d021c344SAndy King 884d021c344SAndy King return 0; 885d021c344SAndy King } 886d021c344SAndy King 887d021c344SAndy King static int 888d021c344SAndy King vsock_bind(struct socket *sock, struct sockaddr *addr, int addr_len) 889d021c344SAndy King { 890d021c344SAndy King int err; 891d021c344SAndy King struct sock *sk; 892d021c344SAndy King struct sockaddr_vm *vm_addr; 893d021c344SAndy King 894d021c344SAndy King sk = sock->sk; 895d021c344SAndy King 896d021c344SAndy King if (vsock_addr_cast(addr, addr_len, &vm_addr) != 0) 897d021c344SAndy King return -EINVAL; 898d021c344SAndy King 899d021c344SAndy King lock_sock(sk); 900d021c344SAndy King err = __vsock_bind(sk, vm_addr); 901d021c344SAndy King release_sock(sk); 902d021c344SAndy King 903d021c344SAndy King return err; 904d021c344SAndy King } 905d021c344SAndy King 906d021c344SAndy King static int vsock_getname(struct socket *sock, 9079b2c45d4SDenys Vlasenko struct sockaddr *addr, int peer) 908d021c344SAndy King { 909d021c344SAndy King int err; 910d021c344SAndy King struct sock *sk; 911d021c344SAndy King struct vsock_sock *vsk; 912d021c344SAndy King struct sockaddr_vm *vm_addr; 913d021c344SAndy King 914d021c344SAndy King sk = sock->sk; 915d021c344SAndy King vsk = vsock_sk(sk); 916d021c344SAndy King err = 0; 917d021c344SAndy King 918d021c344SAndy King lock_sock(sk); 919d021c344SAndy King 920d021c344SAndy King if (peer) { 921d021c344SAndy King if (sock->state != SS_CONNECTED) { 922d021c344SAndy King err = -ENOTCONN; 923d021c344SAndy King goto out; 924d021c344SAndy King } 925d021c344SAndy King vm_addr = &vsk->remote_addr; 926d021c344SAndy King } else { 927d021c344SAndy King vm_addr = &vsk->local_addr; 928d021c344SAndy King } 929d021c344SAndy King 930d021c344SAndy King if (!vm_addr) { 931d021c344SAndy King err = -EINVAL; 932d021c344SAndy King goto out; 933d021c344SAndy King } 934d021c344SAndy King 935d021c344SAndy King /* sys_getsockname() and sys_getpeername() pass us a 936d021c344SAndy King * MAX_SOCK_ADDR-sized buffer and don't set addr_len. Unfortunately 937d021c344SAndy King * that macro is defined in socket.c instead of .h, so we hardcode its 938d021c344SAndy King * value here. 939d021c344SAndy King */ 940d021c344SAndy King BUILD_BUG_ON(sizeof(*vm_addr) > 128); 941d021c344SAndy King memcpy(addr, vm_addr, sizeof(*vm_addr)); 9429b2c45d4SDenys Vlasenko err = sizeof(*vm_addr); 943d021c344SAndy King 944d021c344SAndy King out: 945d021c344SAndy King release_sock(sk); 946d021c344SAndy King return err; 947d021c344SAndy King } 948d021c344SAndy King 949d021c344SAndy King static int vsock_shutdown(struct socket *sock, int mode) 950d021c344SAndy King { 951d021c344SAndy King int err; 952d021c344SAndy King struct sock *sk; 953d021c344SAndy King 954d021c344SAndy King /* User level uses SHUT_RD (0) and SHUT_WR (1), but the kernel uses 955d021c344SAndy King * RCV_SHUTDOWN (1) and SEND_SHUTDOWN (2), so we must increment mode 956d021c344SAndy King * here like the other address families do. Note also that the 957d021c344SAndy King * increment makes SHUT_RDWR (2) into RCV_SHUTDOWN | SEND_SHUTDOWN (3), 958d021c344SAndy King * which is what we want. 959d021c344SAndy King */ 960d021c344SAndy King mode++; 961d021c344SAndy King 962d021c344SAndy King if ((mode & ~SHUTDOWN_MASK) || !mode) 963d021c344SAndy King return -EINVAL; 964d021c344SAndy King 965d021c344SAndy King /* If this is a STREAM socket and it is not connected then bail out 966d021c344SAndy King * immediately. If it is a DGRAM socket then we must first kick the 967d021c344SAndy King * socket so that it wakes up from any sleeping calls, for example 968d021c344SAndy King * recv(), and then afterwards return the error. 969d021c344SAndy King */ 970d021c344SAndy King 971d021c344SAndy King sk = sock->sk; 9721c5fae9cSStefano Garzarella 9731c5fae9cSStefano Garzarella lock_sock(sk); 974d021c344SAndy King if (sock->state == SS_UNCONNECTED) { 975d021c344SAndy King err = -ENOTCONN; 976a9e29e55SArseny Krasnov if (sock_type_connectible(sk->sk_type)) 9771c5fae9cSStefano Garzarella goto out; 978d021c344SAndy King } else { 979d021c344SAndy King sock->state = SS_DISCONNECTING; 980d021c344SAndy King err = 0; 981d021c344SAndy King } 982d021c344SAndy King 983d021c344SAndy King /* Receive and send shutdowns are treated alike. */ 984d021c344SAndy King mode = mode & (RCV_SHUTDOWN | SEND_SHUTDOWN); 985d021c344SAndy King if (mode) { 986d021c344SAndy King sk->sk_shutdown |= mode; 987d021c344SAndy King sk->sk_state_change(sk); 988d021c344SAndy King 989a9e29e55SArseny Krasnov if (sock_type_connectible(sk->sk_type)) { 990d021c344SAndy King sock_reset_flag(sk, SOCK_DONE); 991d021c344SAndy King vsock_send_shutdown(sk, mode); 992d021c344SAndy King } 993d021c344SAndy King } 994d021c344SAndy King 9951c5fae9cSStefano Garzarella out: 9961c5fae9cSStefano Garzarella release_sock(sk); 997d021c344SAndy King return err; 998d021c344SAndy King } 999d021c344SAndy King 1000a11e1d43SLinus Torvalds static __poll_t vsock_poll(struct file *file, struct socket *sock, 1001a11e1d43SLinus Torvalds poll_table *wait) 1002d021c344SAndy King { 1003a11e1d43SLinus Torvalds struct sock *sk; 1004a11e1d43SLinus Torvalds __poll_t mask; 1005a11e1d43SLinus Torvalds struct vsock_sock *vsk; 1006a11e1d43SLinus Torvalds 1007a11e1d43SLinus Torvalds sk = sock->sk; 1008a11e1d43SLinus Torvalds vsk = vsock_sk(sk); 1009a11e1d43SLinus Torvalds 1010a11e1d43SLinus Torvalds poll_wait(file, sk_sleep(sk), wait); 1011a11e1d43SLinus Torvalds mask = 0; 1012d021c344SAndy King 1013d021c344SAndy King if (sk->sk_err) 1014d021c344SAndy King /* Signify that there has been an error on this socket. */ 1015a9a08845SLinus Torvalds mask |= EPOLLERR; 1016d021c344SAndy King 1017d021c344SAndy King /* INET sockets treat local write shutdown and peer write shutdown as a 1018a9a08845SLinus Torvalds * case of EPOLLHUP set. 1019d021c344SAndy King */ 1020d021c344SAndy King if ((sk->sk_shutdown == SHUTDOWN_MASK) || 1021d021c344SAndy King ((sk->sk_shutdown & SEND_SHUTDOWN) && 1022d021c344SAndy King (vsk->peer_shutdown & SEND_SHUTDOWN))) { 1023a9a08845SLinus Torvalds mask |= EPOLLHUP; 1024d021c344SAndy King } 1025d021c344SAndy King 1026d021c344SAndy King if (sk->sk_shutdown & RCV_SHUTDOWN || 1027d021c344SAndy King vsk->peer_shutdown & SEND_SHUTDOWN) { 1028a9a08845SLinus Torvalds mask |= EPOLLRDHUP; 1029d021c344SAndy King } 1030d021c344SAndy King 1031d021c344SAndy King if (sock->type == SOCK_DGRAM) { 1032d021c344SAndy King /* For datagram sockets we can read if there is something in 1033d021c344SAndy King * the queue and write as long as the socket isn't shutdown for 1034d021c344SAndy King * sending. 1035d021c344SAndy King */ 10363ef7cf57SEric Dumazet if (!skb_queue_empty_lockless(&sk->sk_receive_queue) || 1037d021c344SAndy King (sk->sk_shutdown & RCV_SHUTDOWN)) { 1038a9a08845SLinus Torvalds mask |= EPOLLIN | EPOLLRDNORM; 1039d021c344SAndy King } 1040d021c344SAndy King 1041d021c344SAndy King if (!(sk->sk_shutdown & SEND_SHUTDOWN)) 1042a9a08845SLinus Torvalds mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND; 1043d021c344SAndy King 1044a9e29e55SArseny Krasnov } else if (sock_type_connectible(sk->sk_type)) { 1045c518adafSAlexander Popov const struct vsock_transport *transport; 1046c518adafSAlexander Popov 1047d021c344SAndy King lock_sock(sk); 1048d021c344SAndy King 1049c518adafSAlexander Popov transport = vsk->transport; 1050c518adafSAlexander Popov 1051d021c344SAndy King /* Listening sockets that have connections in their accept 1052d021c344SAndy King * queue can be read. 1053d021c344SAndy King */ 10543b4477d2SStefan Hajnoczi if (sk->sk_state == TCP_LISTEN 1055d021c344SAndy King && !vsock_is_accept_queue_empty(sk)) 1056a9a08845SLinus Torvalds mask |= EPOLLIN | EPOLLRDNORM; 1057d021c344SAndy King 1058d021c344SAndy King /* If there is something in the queue then we can read. */ 1059c0cfa2d8SStefano Garzarella if (transport && transport->stream_is_active(vsk) && 1060d021c344SAndy King !(sk->sk_shutdown & RCV_SHUTDOWN)) { 1061d021c344SAndy King bool data_ready_now = false; 1062d021c344SAndy King int ret = transport->notify_poll_in( 1063d021c344SAndy King vsk, 1, &data_ready_now); 1064d021c344SAndy King if (ret < 0) { 1065a9a08845SLinus Torvalds mask |= EPOLLERR; 1066d021c344SAndy King } else { 1067d021c344SAndy King if (data_ready_now) 1068a9a08845SLinus Torvalds mask |= EPOLLIN | EPOLLRDNORM; 1069d021c344SAndy King 1070d021c344SAndy King } 1071d021c344SAndy King } 1072d021c344SAndy King 1073d021c344SAndy King /* Sockets whose connections have been closed, reset, or 1074d021c344SAndy King * terminated should also be considered read, and we check the 1075d021c344SAndy King * shutdown flag for that. 1076d021c344SAndy King */ 1077d021c344SAndy King if (sk->sk_shutdown & RCV_SHUTDOWN || 1078d021c344SAndy King vsk->peer_shutdown & SEND_SHUTDOWN) { 1079a9a08845SLinus Torvalds mask |= EPOLLIN | EPOLLRDNORM; 1080d021c344SAndy King } 1081d021c344SAndy King 1082d021c344SAndy King /* Connected sockets that can produce data can be written. */ 10831980c058SStefano Garzarella if (transport && sk->sk_state == TCP_ESTABLISHED) { 1084d021c344SAndy King if (!(sk->sk_shutdown & SEND_SHUTDOWN)) { 1085d021c344SAndy King bool space_avail_now = false; 1086d021c344SAndy King int ret = transport->notify_poll_out( 1087d021c344SAndy King vsk, 1, &space_avail_now); 1088d021c344SAndy King if (ret < 0) { 1089a9a08845SLinus Torvalds mask |= EPOLLERR; 1090d021c344SAndy King } else { 1091d021c344SAndy King if (space_avail_now) 1092a9a08845SLinus Torvalds /* Remove EPOLLWRBAND since INET 1093d021c344SAndy King * sockets are not setting it. 1094d021c344SAndy King */ 1095a9a08845SLinus Torvalds mask |= EPOLLOUT | EPOLLWRNORM; 1096d021c344SAndy King 1097d021c344SAndy King } 1098d021c344SAndy King } 1099d021c344SAndy King } 1100d021c344SAndy King 1101d021c344SAndy King /* Simulate INET socket poll behaviors, which sets 1102a9a08845SLinus Torvalds * EPOLLOUT|EPOLLWRNORM when peer is closed and nothing to read, 1103d021c344SAndy King * but local send is not shutdown. 1104d021c344SAndy King */ 1105ba3169fcSStefan Hajnoczi if (sk->sk_state == TCP_CLOSE || sk->sk_state == TCP_CLOSING) { 1106d021c344SAndy King if (!(sk->sk_shutdown & SEND_SHUTDOWN)) 1107a9a08845SLinus Torvalds mask |= EPOLLOUT | EPOLLWRNORM; 1108d021c344SAndy King 1109d021c344SAndy King } 1110d021c344SAndy King 1111d021c344SAndy King release_sock(sk); 1112d021c344SAndy King } 1113d021c344SAndy King 1114d021c344SAndy King return mask; 1115d021c344SAndy King } 1116d021c344SAndy King 11171b784140SYing Xue static int vsock_dgram_sendmsg(struct socket *sock, struct msghdr *msg, 11181b784140SYing Xue size_t len) 1119d021c344SAndy King { 1120d021c344SAndy King int err; 1121d021c344SAndy King struct sock *sk; 1122d021c344SAndy King struct vsock_sock *vsk; 1123d021c344SAndy King struct sockaddr_vm *remote_addr; 1124fe502c4aSStefano Garzarella const struct vsock_transport *transport; 1125d021c344SAndy King 1126d021c344SAndy King if (msg->msg_flags & MSG_OOB) 1127d021c344SAndy King return -EOPNOTSUPP; 1128d021c344SAndy King 1129d021c344SAndy King /* For now, MSG_DONTWAIT is always assumed... */ 1130d021c344SAndy King err = 0; 1131d021c344SAndy King sk = sock->sk; 1132d021c344SAndy King vsk = vsock_sk(sk); 1133d021c344SAndy King 1134d021c344SAndy King lock_sock(sk); 1135d021c344SAndy King 1136c518adafSAlexander Popov transport = vsk->transport; 1137c518adafSAlexander Popov 1138b3a6dfe8SAsias He err = vsock_auto_bind(vsk); 1139b3a6dfe8SAsias He if (err) 1140d021c344SAndy King goto out; 1141d021c344SAndy King 1142d021c344SAndy King 1143d021c344SAndy King /* If the provided message contains an address, use that. Otherwise 1144d021c344SAndy King * fall back on the socket's remote handle (if it has been connected). 1145d021c344SAndy King */ 1146d021c344SAndy King if (msg->msg_name && 1147d021c344SAndy King vsock_addr_cast(msg->msg_name, msg->msg_namelen, 1148d021c344SAndy King &remote_addr) == 0) { 1149d021c344SAndy King /* Ensure this address is of the right type and is a valid 1150d021c344SAndy King * destination. 1151d021c344SAndy King */ 1152d021c344SAndy King 1153d021c344SAndy King if (remote_addr->svm_cid == VMADDR_CID_ANY) 1154d021c344SAndy King remote_addr->svm_cid = transport->get_local_cid(); 1155d021c344SAndy King 1156d021c344SAndy King if (!vsock_addr_bound(remote_addr)) { 1157d021c344SAndy King err = -EINVAL; 1158d021c344SAndy King goto out; 1159d021c344SAndy King } 1160d021c344SAndy King } else if (sock->state == SS_CONNECTED) { 1161d021c344SAndy King remote_addr = &vsk->remote_addr; 1162d021c344SAndy King 1163d021c344SAndy King if (remote_addr->svm_cid == VMADDR_CID_ANY) 1164d021c344SAndy King remote_addr->svm_cid = transport->get_local_cid(); 1165d021c344SAndy King 1166d021c344SAndy King /* XXX Should connect() or this function ensure remote_addr is 1167d021c344SAndy King * bound? 1168d021c344SAndy King */ 1169d021c344SAndy King if (!vsock_addr_bound(&vsk->remote_addr)) { 1170d021c344SAndy King err = -EINVAL; 1171d021c344SAndy King goto out; 1172d021c344SAndy King } 1173d021c344SAndy King } else { 1174d021c344SAndy King err = -EINVAL; 1175d021c344SAndy King goto out; 1176d021c344SAndy King } 1177d021c344SAndy King 1178d021c344SAndy King if (!transport->dgram_allow(remote_addr->svm_cid, 1179d021c344SAndy King remote_addr->svm_port)) { 1180d021c344SAndy King err = -EINVAL; 1181d021c344SAndy King goto out; 1182d021c344SAndy King } 1183d021c344SAndy King 11840f7db23aSAl Viro err = transport->dgram_enqueue(vsk, remote_addr, msg, len); 1185d021c344SAndy King 1186d021c344SAndy King out: 1187d021c344SAndy King release_sock(sk); 1188d021c344SAndy King return err; 1189d021c344SAndy King } 1190d021c344SAndy King 1191d021c344SAndy King static int vsock_dgram_connect(struct socket *sock, 1192d021c344SAndy King struct sockaddr *addr, int addr_len, int flags) 1193d021c344SAndy King { 1194d021c344SAndy King int err; 1195d021c344SAndy King struct sock *sk; 1196d021c344SAndy King struct vsock_sock *vsk; 1197d021c344SAndy King struct sockaddr_vm *remote_addr; 1198d021c344SAndy King 1199d021c344SAndy King sk = sock->sk; 1200d021c344SAndy King vsk = vsock_sk(sk); 1201d021c344SAndy King 1202d021c344SAndy King err = vsock_addr_cast(addr, addr_len, &remote_addr); 1203d021c344SAndy King if (err == -EAFNOSUPPORT && remote_addr->svm_family == AF_UNSPEC) { 1204d021c344SAndy King lock_sock(sk); 1205d021c344SAndy King vsock_addr_init(&vsk->remote_addr, VMADDR_CID_ANY, 1206d021c344SAndy King VMADDR_PORT_ANY); 1207d021c344SAndy King sock->state = SS_UNCONNECTED; 1208d021c344SAndy King release_sock(sk); 1209d021c344SAndy King return 0; 1210d021c344SAndy King } else if (err != 0) 1211d021c344SAndy King return -EINVAL; 1212d021c344SAndy King 1213d021c344SAndy King lock_sock(sk); 1214d021c344SAndy King 1215b3a6dfe8SAsias He err = vsock_auto_bind(vsk); 1216b3a6dfe8SAsias He if (err) 1217d021c344SAndy King goto out; 1218d021c344SAndy King 1219fe502c4aSStefano Garzarella if (!vsk->transport->dgram_allow(remote_addr->svm_cid, 1220d021c344SAndy King remote_addr->svm_port)) { 1221d021c344SAndy King err = -EINVAL; 1222d021c344SAndy King goto out; 1223d021c344SAndy King } 1224d021c344SAndy King 1225d021c344SAndy King memcpy(&vsk->remote_addr, remote_addr, sizeof(vsk->remote_addr)); 1226d021c344SAndy King sock->state = SS_CONNECTED; 1227d021c344SAndy King 1228d021c344SAndy King out: 1229d021c344SAndy King release_sock(sk); 1230d021c344SAndy King return err; 1231d021c344SAndy King } 1232d021c344SAndy King 12331b784140SYing Xue static int vsock_dgram_recvmsg(struct socket *sock, struct msghdr *msg, 12341b784140SYing Xue size_t len, int flags) 1235d021c344SAndy King { 1236fe502c4aSStefano Garzarella struct vsock_sock *vsk = vsock_sk(sock->sk); 1237fe502c4aSStefano Garzarella 1238fe502c4aSStefano Garzarella return vsk->transport->dgram_dequeue(vsk, msg, len, flags); 1239d021c344SAndy King } 1240d021c344SAndy King 1241d021c344SAndy King static const struct proto_ops vsock_dgram_ops = { 1242d021c344SAndy King .family = PF_VSOCK, 1243d021c344SAndy King .owner = THIS_MODULE, 1244d021c344SAndy King .release = vsock_release, 1245d021c344SAndy King .bind = vsock_bind, 1246d021c344SAndy King .connect = vsock_dgram_connect, 1247d021c344SAndy King .socketpair = sock_no_socketpair, 1248d021c344SAndy King .accept = sock_no_accept, 1249d021c344SAndy King .getname = vsock_getname, 1250a11e1d43SLinus Torvalds .poll = vsock_poll, 1251d021c344SAndy King .ioctl = sock_no_ioctl, 1252d021c344SAndy King .listen = sock_no_listen, 1253d021c344SAndy King .shutdown = vsock_shutdown, 1254d021c344SAndy King .sendmsg = vsock_dgram_sendmsg, 1255d021c344SAndy King .recvmsg = vsock_dgram_recvmsg, 1256d021c344SAndy King .mmap = sock_no_mmap, 1257d021c344SAndy King .sendpage = sock_no_sendpage, 1258d021c344SAndy King }; 1259d021c344SAndy King 1260380feae0SPeng Tao static int vsock_transport_cancel_pkt(struct vsock_sock *vsk) 1261380feae0SPeng Tao { 1262fe502c4aSStefano Garzarella const struct vsock_transport *transport = vsk->transport; 1263fe502c4aSStefano Garzarella 12645d1cbcc9SNorbert Slusarek if (!transport || !transport->cancel_pkt) 1265380feae0SPeng Tao return -EOPNOTSUPP; 1266380feae0SPeng Tao 1267380feae0SPeng Tao return transport->cancel_pkt(vsk); 1268380feae0SPeng Tao } 1269380feae0SPeng Tao 1270d021c344SAndy King static void vsock_connect_timeout(struct work_struct *work) 1271d021c344SAndy King { 1272d021c344SAndy King struct sock *sk; 1273d021c344SAndy King struct vsock_sock *vsk; 1274d021c344SAndy King 1275455f05ecSCong Wang vsk = container_of(work, struct vsock_sock, connect_work.work); 1276d021c344SAndy King sk = sk_vsock(vsk); 1277d021c344SAndy King 1278d021c344SAndy King lock_sock(sk); 12793b4477d2SStefan Hajnoczi if (sk->sk_state == TCP_SYN_SENT && 1280d021c344SAndy King (sk->sk_shutdown != SHUTDOWN_MASK)) { 12813b4477d2SStefan Hajnoczi sk->sk_state = TCP_CLOSE; 1282d021c344SAndy King sk->sk_err = ETIMEDOUT; 1283d021c344SAndy King sk->sk_error_report(sk); 12843d0bc44dSNorbert Slusarek vsock_transport_cancel_pkt(vsk); 1285d021c344SAndy King } 1286d021c344SAndy King release_sock(sk); 1287d021c344SAndy King 1288d021c344SAndy King sock_put(sk); 1289d021c344SAndy King } 1290d021c344SAndy King 1291a9e29e55SArseny Krasnov static int vsock_connect(struct socket *sock, struct sockaddr *addr, 1292d021c344SAndy King int addr_len, int flags) 1293d021c344SAndy King { 1294d021c344SAndy King int err; 1295d021c344SAndy King struct sock *sk; 1296d021c344SAndy King struct vsock_sock *vsk; 1297fe502c4aSStefano Garzarella const struct vsock_transport *transport; 1298d021c344SAndy King struct sockaddr_vm *remote_addr; 1299d021c344SAndy King long timeout; 1300d021c344SAndy King DEFINE_WAIT(wait); 1301d021c344SAndy King 1302d021c344SAndy King err = 0; 1303d021c344SAndy King sk = sock->sk; 1304d021c344SAndy King vsk = vsock_sk(sk); 1305d021c344SAndy King 1306d021c344SAndy King lock_sock(sk); 1307d021c344SAndy King 1308d021c344SAndy King /* XXX AF_UNSPEC should make us disconnect like AF_INET. */ 1309d021c344SAndy King switch (sock->state) { 1310d021c344SAndy King case SS_CONNECTED: 1311d021c344SAndy King err = -EISCONN; 1312d021c344SAndy King goto out; 1313d021c344SAndy King case SS_DISCONNECTING: 1314d021c344SAndy King err = -EINVAL; 1315d021c344SAndy King goto out; 1316d021c344SAndy King case SS_CONNECTING: 1317d021c344SAndy King /* This continues on so we can move sock into the SS_CONNECTED 1318d021c344SAndy King * state once the connection has completed (at which point err 1319d021c344SAndy King * will be set to zero also). Otherwise, we will either wait 1320d021c344SAndy King * for the connection or return -EALREADY should this be a 1321d021c344SAndy King * non-blocking call. 1322d021c344SAndy King */ 1323d021c344SAndy King err = -EALREADY; 1324d021c344SAndy King break; 1325d021c344SAndy King default: 13263b4477d2SStefan Hajnoczi if ((sk->sk_state == TCP_LISTEN) || 1327d021c344SAndy King vsock_addr_cast(addr, addr_len, &remote_addr) != 0) { 1328d021c344SAndy King err = -EINVAL; 1329d021c344SAndy King goto out; 1330d021c344SAndy King } 1331d021c344SAndy King 1332c0cfa2d8SStefano Garzarella /* Set the remote address that we are connecting to. */ 1333c0cfa2d8SStefano Garzarella memcpy(&vsk->remote_addr, remote_addr, 1334c0cfa2d8SStefano Garzarella sizeof(vsk->remote_addr)); 1335c0cfa2d8SStefano Garzarella 1336c0cfa2d8SStefano Garzarella err = vsock_assign_transport(vsk, NULL); 1337c0cfa2d8SStefano Garzarella if (err) 1338c0cfa2d8SStefano Garzarella goto out; 1339c0cfa2d8SStefano Garzarella 1340c0cfa2d8SStefano Garzarella transport = vsk->transport; 1341c0cfa2d8SStefano Garzarella 1342d021c344SAndy King /* The hypervisor and well-known contexts do not have socket 1343d021c344SAndy King * endpoints. 1344d021c344SAndy King */ 1345c0cfa2d8SStefano Garzarella if (!transport || 1346c0cfa2d8SStefano Garzarella !transport->stream_allow(remote_addr->svm_cid, 1347d021c344SAndy King remote_addr->svm_port)) { 1348d021c344SAndy King err = -ENETUNREACH; 1349d021c344SAndy King goto out; 1350d021c344SAndy King } 1351d021c344SAndy King 1352b3a6dfe8SAsias He err = vsock_auto_bind(vsk); 1353b3a6dfe8SAsias He if (err) 1354d021c344SAndy King goto out; 1355d021c344SAndy King 13563b4477d2SStefan Hajnoczi sk->sk_state = TCP_SYN_SENT; 1357d021c344SAndy King 1358d021c344SAndy King err = transport->connect(vsk); 1359d021c344SAndy King if (err < 0) 1360d021c344SAndy King goto out; 1361d021c344SAndy King 1362d021c344SAndy King /* Mark sock as connecting and set the error code to in 1363d021c344SAndy King * progress in case this is a non-blocking connect. 1364d021c344SAndy King */ 1365d021c344SAndy King sock->state = SS_CONNECTING; 1366d021c344SAndy King err = -EINPROGRESS; 1367d021c344SAndy King } 1368d021c344SAndy King 1369d021c344SAndy King /* The receive path will handle all communication until we are able to 1370d021c344SAndy King * enter the connected state. Here we wait for the connection to be 1371d021c344SAndy King * completed or a notification of an error. 1372d021c344SAndy King */ 1373d021c344SAndy King timeout = vsk->connect_timeout; 1374d021c344SAndy King prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 1375d021c344SAndy King 13763b4477d2SStefan Hajnoczi while (sk->sk_state != TCP_ESTABLISHED && sk->sk_err == 0) { 1377d021c344SAndy King if (flags & O_NONBLOCK) { 1378d021c344SAndy King /* If we're not going to block, we schedule a timeout 1379d021c344SAndy King * function to generate a timeout on the connection 1380d021c344SAndy King * attempt, in case the peer doesn't respond in a 1381d021c344SAndy King * timely manner. We hold on to the socket until the 1382d021c344SAndy King * timeout fires. 1383d021c344SAndy King */ 1384d021c344SAndy King sock_hold(sk); 1385455f05ecSCong Wang schedule_delayed_work(&vsk->connect_work, timeout); 1386d021c344SAndy King 1387d021c344SAndy King /* Skip ahead to preserve error code set above. */ 1388d021c344SAndy King goto out_wait; 1389d021c344SAndy King } 1390d021c344SAndy King 1391d021c344SAndy King release_sock(sk); 1392d021c344SAndy King timeout = schedule_timeout(timeout); 1393d021c344SAndy King lock_sock(sk); 1394d021c344SAndy King 1395d021c344SAndy King if (signal_pending(current)) { 1396d021c344SAndy King err = sock_intr_errno(timeout); 13973b4477d2SStefan Hajnoczi sk->sk_state = TCP_CLOSE; 1398f7f9b5e7SClaudio Imbrenda sock->state = SS_UNCONNECTED; 1399380feae0SPeng Tao vsock_transport_cancel_pkt(vsk); 1400f7f9b5e7SClaudio Imbrenda goto out_wait; 1401d021c344SAndy King } else if (timeout == 0) { 1402d021c344SAndy King err = -ETIMEDOUT; 14033b4477d2SStefan Hajnoczi sk->sk_state = TCP_CLOSE; 1404f7f9b5e7SClaudio Imbrenda sock->state = SS_UNCONNECTED; 1405380feae0SPeng Tao vsock_transport_cancel_pkt(vsk); 1406f7f9b5e7SClaudio Imbrenda goto out_wait; 1407d021c344SAndy King } 1408d021c344SAndy King 1409d021c344SAndy King prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 1410d021c344SAndy King } 1411d021c344SAndy King 1412d021c344SAndy King if (sk->sk_err) { 1413d021c344SAndy King err = -sk->sk_err; 14143b4477d2SStefan Hajnoczi sk->sk_state = TCP_CLOSE; 1415f7f9b5e7SClaudio Imbrenda sock->state = SS_UNCONNECTED; 1416f7f9b5e7SClaudio Imbrenda } else { 1417d021c344SAndy King err = 0; 1418f7f9b5e7SClaudio Imbrenda } 1419d021c344SAndy King 1420d021c344SAndy King out_wait: 1421d021c344SAndy King finish_wait(sk_sleep(sk), &wait); 1422d021c344SAndy King out: 1423d021c344SAndy King release_sock(sk); 1424d021c344SAndy King return err; 1425d021c344SAndy King } 1426d021c344SAndy King 1427cdfbabfbSDavid Howells static int vsock_accept(struct socket *sock, struct socket *newsock, int flags, 1428cdfbabfbSDavid Howells bool kern) 1429d021c344SAndy King { 1430d021c344SAndy King struct sock *listener; 1431d021c344SAndy King int err; 1432d021c344SAndy King struct sock *connected; 1433d021c344SAndy King struct vsock_sock *vconnected; 1434d021c344SAndy King long timeout; 1435d021c344SAndy King DEFINE_WAIT(wait); 1436d021c344SAndy King 1437d021c344SAndy King err = 0; 1438d021c344SAndy King listener = sock->sk; 1439d021c344SAndy King 1440d021c344SAndy King lock_sock(listener); 1441d021c344SAndy King 1442a9e29e55SArseny Krasnov if (!sock_type_connectible(sock->type)) { 1443d021c344SAndy King err = -EOPNOTSUPP; 1444d021c344SAndy King goto out; 1445d021c344SAndy King } 1446d021c344SAndy King 14473b4477d2SStefan Hajnoczi if (listener->sk_state != TCP_LISTEN) { 1448d021c344SAndy King err = -EINVAL; 1449d021c344SAndy King goto out; 1450d021c344SAndy King } 1451d021c344SAndy King 1452d021c344SAndy King /* Wait for children sockets to appear; these are the new sockets 1453d021c344SAndy King * created upon connection establishment. 1454d021c344SAndy King */ 14557e0afbdfSStefano Garzarella timeout = sock_rcvtimeo(listener, flags & O_NONBLOCK); 1456d021c344SAndy King prepare_to_wait(sk_sleep(listener), &wait, TASK_INTERRUPTIBLE); 1457d021c344SAndy King 1458d021c344SAndy King while ((connected = vsock_dequeue_accept(listener)) == NULL && 1459d021c344SAndy King listener->sk_err == 0) { 1460d021c344SAndy King release_sock(listener); 1461d021c344SAndy King timeout = schedule_timeout(timeout); 1462f7f9b5e7SClaudio Imbrenda finish_wait(sk_sleep(listener), &wait); 1463d021c344SAndy King lock_sock(listener); 1464d021c344SAndy King 1465d021c344SAndy King if (signal_pending(current)) { 1466d021c344SAndy King err = sock_intr_errno(timeout); 1467f7f9b5e7SClaudio Imbrenda goto out; 1468d021c344SAndy King } else if (timeout == 0) { 1469d021c344SAndy King err = -EAGAIN; 1470f7f9b5e7SClaudio Imbrenda goto out; 1471d021c344SAndy King } 1472d021c344SAndy King 1473d021c344SAndy King prepare_to_wait(sk_sleep(listener), &wait, TASK_INTERRUPTIBLE); 1474d021c344SAndy King } 1475f7f9b5e7SClaudio Imbrenda finish_wait(sk_sleep(listener), &wait); 1476d021c344SAndy King 1477d021c344SAndy King if (listener->sk_err) 1478d021c344SAndy King err = -listener->sk_err; 1479d021c344SAndy King 1480d021c344SAndy King if (connected) { 14817976a11bSEric Dumazet sk_acceptq_removed(listener); 1482d021c344SAndy King 14834192f672SStefan Hajnoczi lock_sock_nested(connected, SINGLE_DEPTH_NESTING); 1484d021c344SAndy King vconnected = vsock_sk(connected); 1485d021c344SAndy King 1486d021c344SAndy King /* If the listener socket has received an error, then we should 1487d021c344SAndy King * reject this socket and return. Note that we simply mark the 1488d021c344SAndy King * socket rejected, drop our reference, and let the cleanup 1489d021c344SAndy King * function handle the cleanup; the fact that we found it in 1490d021c344SAndy King * the listener's accept queue guarantees that the cleanup 1491d021c344SAndy King * function hasn't run yet. 1492d021c344SAndy King */ 1493d021c344SAndy King if (err) { 1494d021c344SAndy King vconnected->rejected = true; 1495f7f9b5e7SClaudio Imbrenda } else { 1496d021c344SAndy King newsock->state = SS_CONNECTED; 1497d021c344SAndy King sock_graft(connected, newsock); 1498f7f9b5e7SClaudio Imbrenda } 1499f7f9b5e7SClaudio Imbrenda 1500d021c344SAndy King release_sock(connected); 1501d021c344SAndy King sock_put(connected); 1502d021c344SAndy King } 1503d021c344SAndy King 1504d021c344SAndy King out: 1505d021c344SAndy King release_sock(listener); 1506d021c344SAndy King return err; 1507d021c344SAndy King } 1508d021c344SAndy King 1509d021c344SAndy King static int vsock_listen(struct socket *sock, int backlog) 1510d021c344SAndy King { 1511d021c344SAndy King int err; 1512d021c344SAndy King struct sock *sk; 1513d021c344SAndy King struct vsock_sock *vsk; 1514d021c344SAndy King 1515d021c344SAndy King sk = sock->sk; 1516d021c344SAndy King 1517d021c344SAndy King lock_sock(sk); 1518d021c344SAndy King 1519a9e29e55SArseny Krasnov if (!sock_type_connectible(sk->sk_type)) { 1520d021c344SAndy King err = -EOPNOTSUPP; 1521d021c344SAndy King goto out; 1522d021c344SAndy King } 1523d021c344SAndy King 1524d021c344SAndy King if (sock->state != SS_UNCONNECTED) { 1525d021c344SAndy King err = -EINVAL; 1526d021c344SAndy King goto out; 1527d021c344SAndy King } 1528d021c344SAndy King 1529d021c344SAndy King vsk = vsock_sk(sk); 1530d021c344SAndy King 1531d021c344SAndy King if (!vsock_addr_bound(&vsk->local_addr)) { 1532d021c344SAndy King err = -EINVAL; 1533d021c344SAndy King goto out; 1534d021c344SAndy King } 1535d021c344SAndy King 1536d021c344SAndy King sk->sk_max_ack_backlog = backlog; 15373b4477d2SStefan Hajnoczi sk->sk_state = TCP_LISTEN; 1538d021c344SAndy King 1539d021c344SAndy King err = 0; 1540d021c344SAndy King 1541d021c344SAndy King out: 1542d021c344SAndy King release_sock(sk); 1543d021c344SAndy King return err; 1544d021c344SAndy King } 1545d021c344SAndy King 1546b9f2b0ffSStefano Garzarella static void vsock_update_buffer_size(struct vsock_sock *vsk, 1547b9f2b0ffSStefano Garzarella const struct vsock_transport *transport, 1548b9f2b0ffSStefano Garzarella u64 val) 1549b9f2b0ffSStefano Garzarella { 1550b9f2b0ffSStefano Garzarella if (val > vsk->buffer_max_size) 1551b9f2b0ffSStefano Garzarella val = vsk->buffer_max_size; 1552b9f2b0ffSStefano Garzarella 1553b9f2b0ffSStefano Garzarella if (val < vsk->buffer_min_size) 1554b9f2b0ffSStefano Garzarella val = vsk->buffer_min_size; 1555b9f2b0ffSStefano Garzarella 1556b9f2b0ffSStefano Garzarella if (val != vsk->buffer_size && 1557b9f2b0ffSStefano Garzarella transport && transport->notify_buffer_size) 1558b9f2b0ffSStefano Garzarella transport->notify_buffer_size(vsk, &val); 1559b9f2b0ffSStefano Garzarella 1560b9f2b0ffSStefano Garzarella vsk->buffer_size = val; 1561b9f2b0ffSStefano Garzarella } 1562b9f2b0ffSStefano Garzarella 1563a9e29e55SArseny Krasnov static int vsock_connectible_setsockopt(struct socket *sock, 1564d021c344SAndy King int level, 1565d021c344SAndy King int optname, 1566a7b75c5aSChristoph Hellwig sockptr_t optval, 1567d021c344SAndy King unsigned int optlen) 1568d021c344SAndy King { 1569d021c344SAndy King int err; 1570d021c344SAndy King struct sock *sk; 1571d021c344SAndy King struct vsock_sock *vsk; 1572fe502c4aSStefano Garzarella const struct vsock_transport *transport; 1573d021c344SAndy King u64 val; 1574d021c344SAndy King 1575d021c344SAndy King if (level != AF_VSOCK) 1576d021c344SAndy King return -ENOPROTOOPT; 1577d021c344SAndy King 1578d021c344SAndy King #define COPY_IN(_v) \ 1579d021c344SAndy King do { \ 1580d021c344SAndy King if (optlen < sizeof(_v)) { \ 1581d021c344SAndy King err = -EINVAL; \ 1582d021c344SAndy King goto exit; \ 1583d021c344SAndy King } \ 1584a7b75c5aSChristoph Hellwig if (copy_from_sockptr(&_v, optval, sizeof(_v)) != 0) { \ 1585d021c344SAndy King err = -EFAULT; \ 1586d021c344SAndy King goto exit; \ 1587d021c344SAndy King } \ 1588d021c344SAndy King } while (0) 1589d021c344SAndy King 1590d021c344SAndy King err = 0; 1591d021c344SAndy King sk = sock->sk; 1592d021c344SAndy King vsk = vsock_sk(sk); 1593d021c344SAndy King 1594d021c344SAndy King lock_sock(sk); 1595d021c344SAndy King 1596c518adafSAlexander Popov transport = vsk->transport; 1597c518adafSAlexander Popov 1598d021c344SAndy King switch (optname) { 1599d021c344SAndy King case SO_VM_SOCKETS_BUFFER_SIZE: 1600d021c344SAndy King COPY_IN(val); 1601b9f2b0ffSStefano Garzarella vsock_update_buffer_size(vsk, transport, val); 1602d021c344SAndy King break; 1603d021c344SAndy King 1604d021c344SAndy King case SO_VM_SOCKETS_BUFFER_MAX_SIZE: 1605d021c344SAndy King COPY_IN(val); 1606b9f2b0ffSStefano Garzarella vsk->buffer_max_size = val; 1607b9f2b0ffSStefano Garzarella vsock_update_buffer_size(vsk, transport, vsk->buffer_size); 1608d021c344SAndy King break; 1609d021c344SAndy King 1610d021c344SAndy King case SO_VM_SOCKETS_BUFFER_MIN_SIZE: 1611d021c344SAndy King COPY_IN(val); 1612b9f2b0ffSStefano Garzarella vsk->buffer_min_size = val; 1613b9f2b0ffSStefano Garzarella vsock_update_buffer_size(vsk, transport, vsk->buffer_size); 1614d021c344SAndy King break; 1615d021c344SAndy King 1616d021c344SAndy King case SO_VM_SOCKETS_CONNECT_TIMEOUT: { 1617fe0c72f3SArnd Bergmann struct __kernel_old_timeval tv; 1618d021c344SAndy King COPY_IN(tv); 1619d021c344SAndy King if (tv.tv_sec >= 0 && tv.tv_usec < USEC_PER_SEC && 1620d021c344SAndy King tv.tv_sec < (MAX_SCHEDULE_TIMEOUT / HZ - 1)) { 1621d021c344SAndy King vsk->connect_timeout = tv.tv_sec * HZ + 1622d021c344SAndy King DIV_ROUND_UP(tv.tv_usec, (1000000 / HZ)); 1623d021c344SAndy King if (vsk->connect_timeout == 0) 1624d021c344SAndy King vsk->connect_timeout = 1625d021c344SAndy King VSOCK_DEFAULT_CONNECT_TIMEOUT; 1626d021c344SAndy King 1627d021c344SAndy King } else { 1628d021c344SAndy King err = -ERANGE; 1629d021c344SAndy King } 1630d021c344SAndy King break; 1631d021c344SAndy King } 1632d021c344SAndy King 1633d021c344SAndy King default: 1634d021c344SAndy King err = -ENOPROTOOPT; 1635d021c344SAndy King break; 1636d021c344SAndy King } 1637d021c344SAndy King 1638d021c344SAndy King #undef COPY_IN 1639d021c344SAndy King 1640d021c344SAndy King exit: 1641d021c344SAndy King release_sock(sk); 1642d021c344SAndy King return err; 1643d021c344SAndy King } 1644d021c344SAndy King 1645a9e29e55SArseny Krasnov static int vsock_connectible_getsockopt(struct socket *sock, 1646d021c344SAndy King int level, int optname, 1647d021c344SAndy King char __user *optval, 1648d021c344SAndy King int __user *optlen) 1649d021c344SAndy King { 1650d021c344SAndy King int err; 1651d021c344SAndy King int len; 1652d021c344SAndy King struct sock *sk; 1653d021c344SAndy King struct vsock_sock *vsk; 1654d021c344SAndy King u64 val; 1655d021c344SAndy King 1656d021c344SAndy King if (level != AF_VSOCK) 1657d021c344SAndy King return -ENOPROTOOPT; 1658d021c344SAndy King 1659d021c344SAndy King err = get_user(len, optlen); 1660d021c344SAndy King if (err != 0) 1661d021c344SAndy King return err; 1662d021c344SAndy King 1663d021c344SAndy King #define COPY_OUT(_v) \ 1664d021c344SAndy King do { \ 1665d021c344SAndy King if (len < sizeof(_v)) \ 1666d021c344SAndy King return -EINVAL; \ 1667d021c344SAndy King \ 1668d021c344SAndy King len = sizeof(_v); \ 1669d021c344SAndy King if (copy_to_user(optval, &_v, len) != 0) \ 1670d021c344SAndy King return -EFAULT; \ 1671d021c344SAndy King \ 1672d021c344SAndy King } while (0) 1673d021c344SAndy King 1674d021c344SAndy King err = 0; 1675d021c344SAndy King sk = sock->sk; 1676d021c344SAndy King vsk = vsock_sk(sk); 1677d021c344SAndy King 1678d021c344SAndy King switch (optname) { 1679d021c344SAndy King case SO_VM_SOCKETS_BUFFER_SIZE: 1680b9f2b0ffSStefano Garzarella val = vsk->buffer_size; 1681d021c344SAndy King COPY_OUT(val); 1682d021c344SAndy King break; 1683d021c344SAndy King 1684d021c344SAndy King case SO_VM_SOCKETS_BUFFER_MAX_SIZE: 1685b9f2b0ffSStefano Garzarella val = vsk->buffer_max_size; 1686d021c344SAndy King COPY_OUT(val); 1687d021c344SAndy King break; 1688d021c344SAndy King 1689d021c344SAndy King case SO_VM_SOCKETS_BUFFER_MIN_SIZE: 1690b9f2b0ffSStefano Garzarella val = vsk->buffer_min_size; 1691d021c344SAndy King COPY_OUT(val); 1692d021c344SAndy King break; 1693d021c344SAndy King 1694d021c344SAndy King case SO_VM_SOCKETS_CONNECT_TIMEOUT: { 1695fe0c72f3SArnd Bergmann struct __kernel_old_timeval tv; 1696d021c344SAndy King tv.tv_sec = vsk->connect_timeout / HZ; 1697d021c344SAndy King tv.tv_usec = 1698d021c344SAndy King (vsk->connect_timeout - 1699d021c344SAndy King tv.tv_sec * HZ) * (1000000 / HZ); 1700d021c344SAndy King COPY_OUT(tv); 1701d021c344SAndy King break; 1702d021c344SAndy King } 1703d021c344SAndy King default: 1704d021c344SAndy King return -ENOPROTOOPT; 1705d021c344SAndy King } 1706d021c344SAndy King 1707d021c344SAndy King err = put_user(len, optlen); 1708d021c344SAndy King if (err != 0) 1709d021c344SAndy King return -EFAULT; 1710d021c344SAndy King 1711d021c344SAndy King #undef COPY_OUT 1712d021c344SAndy King 1713d021c344SAndy King return 0; 1714d021c344SAndy King } 1715d021c344SAndy King 1716a9e29e55SArseny Krasnov static int vsock_connectible_sendmsg(struct socket *sock, struct msghdr *msg, 17171b784140SYing Xue size_t len) 1718d021c344SAndy King { 1719d021c344SAndy King struct sock *sk; 1720d021c344SAndy King struct vsock_sock *vsk; 1721fe502c4aSStefano Garzarella const struct vsock_transport *transport; 1722d021c344SAndy King ssize_t total_written; 1723d021c344SAndy King long timeout; 1724d021c344SAndy King int err; 1725d021c344SAndy King struct vsock_transport_send_notify_data send_data; 1726499fde66SWANG Cong DEFINE_WAIT_FUNC(wait, woken_wake_function); 1727d021c344SAndy King 1728d021c344SAndy King sk = sock->sk; 1729d021c344SAndy King vsk = vsock_sk(sk); 1730d021c344SAndy King total_written = 0; 1731d021c344SAndy King err = 0; 1732d021c344SAndy King 1733d021c344SAndy King if (msg->msg_flags & MSG_OOB) 1734d021c344SAndy King return -EOPNOTSUPP; 1735d021c344SAndy King 1736d021c344SAndy King lock_sock(sk); 1737d021c344SAndy King 1738c518adafSAlexander Popov transport = vsk->transport; 1739c518adafSAlexander Popov 1740d021c344SAndy King /* Callers should not provide a destination with stream sockets. */ 1741d021c344SAndy King if (msg->msg_namelen) { 17423b4477d2SStefan Hajnoczi err = sk->sk_state == TCP_ESTABLISHED ? -EISCONN : -EOPNOTSUPP; 1743d021c344SAndy King goto out; 1744d021c344SAndy King } 1745d021c344SAndy King 1746d021c344SAndy King /* Send data only if both sides are not shutdown in the direction. */ 1747d021c344SAndy King if (sk->sk_shutdown & SEND_SHUTDOWN || 1748d021c344SAndy King vsk->peer_shutdown & RCV_SHUTDOWN) { 1749d021c344SAndy King err = -EPIPE; 1750d021c344SAndy King goto out; 1751d021c344SAndy King } 1752d021c344SAndy King 1753c0cfa2d8SStefano Garzarella if (!transport || sk->sk_state != TCP_ESTABLISHED || 1754d021c344SAndy King !vsock_addr_bound(&vsk->local_addr)) { 1755d021c344SAndy King err = -ENOTCONN; 1756d021c344SAndy King goto out; 1757d021c344SAndy King } 1758d021c344SAndy King 1759d021c344SAndy King if (!vsock_addr_bound(&vsk->remote_addr)) { 1760d021c344SAndy King err = -EDESTADDRREQ; 1761d021c344SAndy King goto out; 1762d021c344SAndy King } 1763d021c344SAndy King 1764d021c344SAndy King /* Wait for room in the produce queue to enqueue our user's data. */ 1765d021c344SAndy King timeout = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT); 1766d021c344SAndy King 1767d021c344SAndy King err = transport->notify_send_init(vsk, &send_data); 1768d021c344SAndy King if (err < 0) 1769d021c344SAndy King goto out; 1770d021c344SAndy King 1771d021c344SAndy King while (total_written < len) { 1772d021c344SAndy King ssize_t written; 1773d021c344SAndy King 1774499fde66SWANG Cong add_wait_queue(sk_sleep(sk), &wait); 1775d021c344SAndy King while (vsock_stream_has_space(vsk) == 0 && 1776d021c344SAndy King sk->sk_err == 0 && 1777d021c344SAndy King !(sk->sk_shutdown & SEND_SHUTDOWN) && 1778d021c344SAndy King !(vsk->peer_shutdown & RCV_SHUTDOWN)) { 1779d021c344SAndy King 1780d021c344SAndy King /* Don't wait for non-blocking sockets. */ 1781d021c344SAndy King if (timeout == 0) { 1782d021c344SAndy King err = -EAGAIN; 1783499fde66SWANG Cong remove_wait_queue(sk_sleep(sk), &wait); 1784f7f9b5e7SClaudio Imbrenda goto out_err; 1785d021c344SAndy King } 1786d021c344SAndy King 1787d021c344SAndy King err = transport->notify_send_pre_block(vsk, &send_data); 1788f7f9b5e7SClaudio Imbrenda if (err < 0) { 1789499fde66SWANG Cong remove_wait_queue(sk_sleep(sk), &wait); 1790f7f9b5e7SClaudio Imbrenda goto out_err; 1791f7f9b5e7SClaudio Imbrenda } 1792d021c344SAndy King 1793d021c344SAndy King release_sock(sk); 1794499fde66SWANG Cong timeout = wait_woken(&wait, TASK_INTERRUPTIBLE, timeout); 1795d021c344SAndy King lock_sock(sk); 1796d021c344SAndy King if (signal_pending(current)) { 1797d021c344SAndy King err = sock_intr_errno(timeout); 1798499fde66SWANG Cong remove_wait_queue(sk_sleep(sk), &wait); 1799f7f9b5e7SClaudio Imbrenda goto out_err; 1800d021c344SAndy King } else if (timeout == 0) { 1801d021c344SAndy King err = -EAGAIN; 1802499fde66SWANG Cong remove_wait_queue(sk_sleep(sk), &wait); 1803f7f9b5e7SClaudio Imbrenda goto out_err; 1804d021c344SAndy King } 1805d021c344SAndy King } 1806499fde66SWANG Cong remove_wait_queue(sk_sleep(sk), &wait); 1807d021c344SAndy King 1808d021c344SAndy King /* These checks occur both as part of and after the loop 1809d021c344SAndy King * conditional since we need to check before and after 1810d021c344SAndy King * sleeping. 1811d021c344SAndy King */ 1812d021c344SAndy King if (sk->sk_err) { 1813d021c344SAndy King err = -sk->sk_err; 1814f7f9b5e7SClaudio Imbrenda goto out_err; 1815d021c344SAndy King } else if ((sk->sk_shutdown & SEND_SHUTDOWN) || 1816d021c344SAndy King (vsk->peer_shutdown & RCV_SHUTDOWN)) { 1817d021c344SAndy King err = -EPIPE; 1818f7f9b5e7SClaudio Imbrenda goto out_err; 1819d021c344SAndy King } 1820d021c344SAndy King 1821d021c344SAndy King err = transport->notify_send_pre_enqueue(vsk, &send_data); 1822d021c344SAndy King if (err < 0) 1823f7f9b5e7SClaudio Imbrenda goto out_err; 1824d021c344SAndy King 1825d021c344SAndy King /* Note that enqueue will only write as many bytes as are free 1826d021c344SAndy King * in the produce queue, so we don't need to ensure len is 1827d021c344SAndy King * smaller than the queue size. It is the caller's 1828d021c344SAndy King * responsibility to check how many bytes we were able to send. 1829d021c344SAndy King */ 1830d021c344SAndy King 1831fbe70c48SArseny Krasnov if (sk->sk_type == SOCK_SEQPACKET) { 1832fbe70c48SArseny Krasnov written = transport->seqpacket_enqueue(vsk, 1833fbe70c48SArseny Krasnov msg, len - total_written); 1834fbe70c48SArseny Krasnov } else { 1835fbe70c48SArseny Krasnov written = transport->stream_enqueue(vsk, 1836fbe70c48SArseny Krasnov msg, len - total_written); 1837fbe70c48SArseny Krasnov } 1838d021c344SAndy King if (written < 0) { 1839d021c344SAndy King err = -ENOMEM; 1840f7f9b5e7SClaudio Imbrenda goto out_err; 1841d021c344SAndy King } 1842d021c344SAndy King 1843d021c344SAndy King total_written += written; 1844d021c344SAndy King 1845d021c344SAndy King err = transport->notify_send_post_enqueue( 1846d021c344SAndy King vsk, written, &send_data); 1847d021c344SAndy King if (err < 0) 1848f7f9b5e7SClaudio Imbrenda goto out_err; 1849d021c344SAndy King 1850d021c344SAndy King } 1851d021c344SAndy King 1852f7f9b5e7SClaudio Imbrenda out_err: 1853fbe70c48SArseny Krasnov if (total_written > 0) { 1854fbe70c48SArseny Krasnov /* Return number of written bytes only if: 1855fbe70c48SArseny Krasnov * 1) SOCK_STREAM socket. 1856fbe70c48SArseny Krasnov * 2) SOCK_SEQPACKET socket when whole buffer is sent. 1857fbe70c48SArseny Krasnov */ 1858fbe70c48SArseny Krasnov if (sk->sk_type == SOCK_STREAM || total_written == len) 1859d021c344SAndy King err = total_written; 1860fbe70c48SArseny Krasnov } 1861d021c344SAndy King out: 1862d021c344SAndy King release_sock(sk); 1863d021c344SAndy King return err; 1864d021c344SAndy King } 1865d021c344SAndy King 1866b3f7fd54SArseny Krasnov static int vsock_wait_data(struct sock *sk, struct wait_queue_entry *wait, 1867b3f7fd54SArseny Krasnov long timeout, 1868b3f7fd54SArseny Krasnov struct vsock_transport_recv_notify_data *recv_data, 1869b3f7fd54SArseny Krasnov size_t target) 1870b3f7fd54SArseny Krasnov { 1871b3f7fd54SArseny Krasnov const struct vsock_transport *transport; 1872b3f7fd54SArseny Krasnov struct vsock_sock *vsk; 1873b3f7fd54SArseny Krasnov s64 data; 1874b3f7fd54SArseny Krasnov int err; 1875b3f7fd54SArseny Krasnov 1876b3f7fd54SArseny Krasnov vsk = vsock_sk(sk); 1877b3f7fd54SArseny Krasnov err = 0; 1878b3f7fd54SArseny Krasnov transport = vsk->transport; 1879b3f7fd54SArseny Krasnov 1880*0798e78bSArseny Krasnov while ((data = vsock_has_data(vsk)) == 0) { 1881b3f7fd54SArseny Krasnov prepare_to_wait(sk_sleep(sk), wait, TASK_INTERRUPTIBLE); 1882b3f7fd54SArseny Krasnov 1883b3f7fd54SArseny Krasnov if (sk->sk_err != 0 || 1884b3f7fd54SArseny Krasnov (sk->sk_shutdown & RCV_SHUTDOWN) || 1885b3f7fd54SArseny Krasnov (vsk->peer_shutdown & SEND_SHUTDOWN)) { 1886b3f7fd54SArseny Krasnov break; 1887b3f7fd54SArseny Krasnov } 1888b3f7fd54SArseny Krasnov 1889b3f7fd54SArseny Krasnov /* Don't wait for non-blocking sockets. */ 1890b3f7fd54SArseny Krasnov if (timeout == 0) { 1891b3f7fd54SArseny Krasnov err = -EAGAIN; 1892b3f7fd54SArseny Krasnov break; 1893b3f7fd54SArseny Krasnov } 1894b3f7fd54SArseny Krasnov 1895b3f7fd54SArseny Krasnov if (recv_data) { 1896b3f7fd54SArseny Krasnov err = transport->notify_recv_pre_block(vsk, target, recv_data); 1897b3f7fd54SArseny Krasnov if (err < 0) 1898b3f7fd54SArseny Krasnov break; 1899b3f7fd54SArseny Krasnov } 1900b3f7fd54SArseny Krasnov 1901b3f7fd54SArseny Krasnov release_sock(sk); 1902b3f7fd54SArseny Krasnov timeout = schedule_timeout(timeout); 1903b3f7fd54SArseny Krasnov lock_sock(sk); 1904b3f7fd54SArseny Krasnov 1905b3f7fd54SArseny Krasnov if (signal_pending(current)) { 1906b3f7fd54SArseny Krasnov err = sock_intr_errno(timeout); 1907b3f7fd54SArseny Krasnov break; 1908b3f7fd54SArseny Krasnov } else if (timeout == 0) { 1909b3f7fd54SArseny Krasnov err = -EAGAIN; 1910b3f7fd54SArseny Krasnov break; 1911b3f7fd54SArseny Krasnov } 1912b3f7fd54SArseny Krasnov } 1913b3f7fd54SArseny Krasnov 1914b3f7fd54SArseny Krasnov finish_wait(sk_sleep(sk), wait); 1915b3f7fd54SArseny Krasnov 1916b3f7fd54SArseny Krasnov if (err) 1917b3f7fd54SArseny Krasnov return err; 1918b3f7fd54SArseny Krasnov 1919b3f7fd54SArseny Krasnov /* Internal transport error when checking for available 1920b3f7fd54SArseny Krasnov * data. XXX This should be changed to a connection 1921b3f7fd54SArseny Krasnov * reset in a later change. 1922b3f7fd54SArseny Krasnov */ 1923b3f7fd54SArseny Krasnov if (data < 0) 1924b3f7fd54SArseny Krasnov return -ENOMEM; 1925b3f7fd54SArseny Krasnov 1926b3f7fd54SArseny Krasnov return data; 1927b3f7fd54SArseny Krasnov } 1928b3f7fd54SArseny Krasnov 192919c1b90eSArseny Krasnov static int __vsock_stream_recvmsg(struct sock *sk, struct msghdr *msg, 193019c1b90eSArseny Krasnov size_t len, int flags) 1931d021c344SAndy King { 1932d021c344SAndy King struct vsock_transport_recv_notify_data recv_data; 193319c1b90eSArseny Krasnov const struct vsock_transport *transport; 193419c1b90eSArseny Krasnov struct vsock_sock *vsk; 193519c1b90eSArseny Krasnov ssize_t copied; 193619c1b90eSArseny Krasnov size_t target; 193719c1b90eSArseny Krasnov long timeout; 193819c1b90eSArseny Krasnov int err; 1939d021c344SAndy King 1940d021c344SAndy King DEFINE_WAIT(wait); 1941d021c344SAndy King 1942d021c344SAndy King vsk = vsock_sk(sk); 1943c518adafSAlexander Popov transport = vsk->transport; 1944c518adafSAlexander Popov 1945d021c344SAndy King /* We must not copy less than target bytes into the user's buffer 1946d021c344SAndy King * before returning successfully, so we wait for the consume queue to 1947d021c344SAndy King * have that much data to consume before dequeueing. Note that this 1948d021c344SAndy King * makes it impossible to handle cases where target is greater than the 1949d021c344SAndy King * queue size. 1950d021c344SAndy King */ 1951d021c344SAndy King target = sock_rcvlowat(sk, flags & MSG_WAITALL, len); 1952d021c344SAndy King if (target >= transport->stream_rcvhiwat(vsk)) { 1953d021c344SAndy King err = -ENOMEM; 1954d021c344SAndy King goto out; 1955d021c344SAndy King } 1956d021c344SAndy King timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); 1957d021c344SAndy King copied = 0; 1958d021c344SAndy King 1959d021c344SAndy King err = transport->notify_recv_init(vsk, target, &recv_data); 1960d021c344SAndy King if (err < 0) 1961d021c344SAndy King goto out; 1962d021c344SAndy King 1963d021c344SAndy King 1964d021c344SAndy King while (1) { 1965f7f9b5e7SClaudio Imbrenda ssize_t read; 1966f7f9b5e7SClaudio Imbrenda 1967b3f7fd54SArseny Krasnov err = vsock_wait_data(sk, &wait, timeout, &recv_data, target); 1968b3f7fd54SArseny Krasnov if (err <= 0) 1969b3f7fd54SArseny Krasnov break; 1970d021c344SAndy King 1971b3f7fd54SArseny Krasnov err = transport->notify_recv_pre_dequeue(vsk, target, 1972b3f7fd54SArseny Krasnov &recv_data); 1973d021c344SAndy King if (err < 0) 1974d021c344SAndy King break; 1975d021c344SAndy King 1976b3f7fd54SArseny Krasnov read = transport->stream_dequeue(vsk, msg, len - copied, flags); 1977d021c344SAndy King if (read < 0) { 1978d021c344SAndy King err = -ENOMEM; 1979d021c344SAndy King break; 1980d021c344SAndy King } 1981d021c344SAndy King 1982d021c344SAndy King copied += read; 1983d021c344SAndy King 1984b3f7fd54SArseny Krasnov err = transport->notify_recv_post_dequeue(vsk, target, read, 1985d021c344SAndy King !(flags & MSG_PEEK), &recv_data); 1986d021c344SAndy King if (err < 0) 1987f7f9b5e7SClaudio Imbrenda goto out; 1988d021c344SAndy King 1989d021c344SAndy King if (read >= target || flags & MSG_PEEK) 1990d021c344SAndy King break; 1991d021c344SAndy King 1992d021c344SAndy King target -= read; 1993d021c344SAndy King } 1994d021c344SAndy King 1995d021c344SAndy King if (sk->sk_err) 1996d021c344SAndy King err = -sk->sk_err; 1997d021c344SAndy King else if (sk->sk_shutdown & RCV_SHUTDOWN) 1998d021c344SAndy King err = 0; 1999d021c344SAndy King 2000dedc58e0SIan Campbell if (copied > 0) 2001d021c344SAndy King err = copied; 2002d021c344SAndy King 2003d021c344SAndy King out: 200419c1b90eSArseny Krasnov return err; 200519c1b90eSArseny Krasnov } 200619c1b90eSArseny Krasnov 20079942c192SArseny Krasnov static int __vsock_seqpacket_recvmsg(struct sock *sk, struct msghdr *msg, 20089942c192SArseny Krasnov size_t len, int flags) 20099942c192SArseny Krasnov { 20109942c192SArseny Krasnov const struct vsock_transport *transport; 20119942c192SArseny Krasnov struct vsock_sock *vsk; 20129942c192SArseny Krasnov ssize_t record_len; 20139942c192SArseny Krasnov long timeout; 20149942c192SArseny Krasnov int err = 0; 20159942c192SArseny Krasnov DEFINE_WAIT(wait); 20169942c192SArseny Krasnov 20179942c192SArseny Krasnov vsk = vsock_sk(sk); 20189942c192SArseny Krasnov transport = vsk->transport; 20199942c192SArseny Krasnov 20209942c192SArseny Krasnov timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); 20219942c192SArseny Krasnov 20229942c192SArseny Krasnov err = vsock_wait_data(sk, &wait, timeout, NULL, 0); 20239942c192SArseny Krasnov if (err <= 0) 20249942c192SArseny Krasnov goto out; 20259942c192SArseny Krasnov 20269942c192SArseny Krasnov record_len = transport->seqpacket_dequeue(vsk, msg, flags); 20279942c192SArseny Krasnov 20289942c192SArseny Krasnov if (record_len < 0) { 20299942c192SArseny Krasnov err = -ENOMEM; 20309942c192SArseny Krasnov goto out; 20319942c192SArseny Krasnov } 20329942c192SArseny Krasnov 20339942c192SArseny Krasnov if (sk->sk_err) { 20349942c192SArseny Krasnov err = -sk->sk_err; 20359942c192SArseny Krasnov } else if (sk->sk_shutdown & RCV_SHUTDOWN) { 20369942c192SArseny Krasnov err = 0; 20379942c192SArseny Krasnov } else { 20389942c192SArseny Krasnov /* User sets MSG_TRUNC, so return real length of 20399942c192SArseny Krasnov * packet. 20409942c192SArseny Krasnov */ 20419942c192SArseny Krasnov if (flags & MSG_TRUNC) 20429942c192SArseny Krasnov err = record_len; 20439942c192SArseny Krasnov else 20449942c192SArseny Krasnov err = len - msg_data_left(msg); 20459942c192SArseny Krasnov 20469942c192SArseny Krasnov /* Always set MSG_TRUNC if real length of packet is 20479942c192SArseny Krasnov * bigger than user's buffer. 20489942c192SArseny Krasnov */ 20499942c192SArseny Krasnov if (record_len > len) 20509942c192SArseny Krasnov msg->msg_flags |= MSG_TRUNC; 20519942c192SArseny Krasnov } 20529942c192SArseny Krasnov 20539942c192SArseny Krasnov out: 20549942c192SArseny Krasnov return err; 20559942c192SArseny Krasnov } 20569942c192SArseny Krasnov 205719c1b90eSArseny Krasnov static int 205819c1b90eSArseny Krasnov vsock_connectible_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, 205919c1b90eSArseny Krasnov int flags) 206019c1b90eSArseny Krasnov { 206119c1b90eSArseny Krasnov struct sock *sk; 206219c1b90eSArseny Krasnov struct vsock_sock *vsk; 206319c1b90eSArseny Krasnov const struct vsock_transport *transport; 206419c1b90eSArseny Krasnov int err; 206519c1b90eSArseny Krasnov 206619c1b90eSArseny Krasnov DEFINE_WAIT(wait); 206719c1b90eSArseny Krasnov 206819c1b90eSArseny Krasnov sk = sock->sk; 206919c1b90eSArseny Krasnov vsk = vsock_sk(sk); 207019c1b90eSArseny Krasnov err = 0; 207119c1b90eSArseny Krasnov 207219c1b90eSArseny Krasnov lock_sock(sk); 207319c1b90eSArseny Krasnov 207419c1b90eSArseny Krasnov transport = vsk->transport; 207519c1b90eSArseny Krasnov 207619c1b90eSArseny Krasnov if (!transport || sk->sk_state != TCP_ESTABLISHED) { 207719c1b90eSArseny Krasnov /* Recvmsg is supposed to return 0 if a peer performs an 207819c1b90eSArseny Krasnov * orderly shutdown. Differentiate between that case and when a 207919c1b90eSArseny Krasnov * peer has not connected or a local shutdown occurred with the 208019c1b90eSArseny Krasnov * SOCK_DONE flag. 208119c1b90eSArseny Krasnov */ 208219c1b90eSArseny Krasnov if (sock_flag(sk, SOCK_DONE)) 208319c1b90eSArseny Krasnov err = 0; 208419c1b90eSArseny Krasnov else 208519c1b90eSArseny Krasnov err = -ENOTCONN; 208619c1b90eSArseny Krasnov 208719c1b90eSArseny Krasnov goto out; 208819c1b90eSArseny Krasnov } 208919c1b90eSArseny Krasnov 209019c1b90eSArseny Krasnov if (flags & MSG_OOB) { 209119c1b90eSArseny Krasnov err = -EOPNOTSUPP; 209219c1b90eSArseny Krasnov goto out; 209319c1b90eSArseny Krasnov } 209419c1b90eSArseny Krasnov 209519c1b90eSArseny Krasnov /* We don't check peer_shutdown flag here since peer may actually shut 209619c1b90eSArseny Krasnov * down, but there can be data in the queue that a local socket can 209719c1b90eSArseny Krasnov * receive. 209819c1b90eSArseny Krasnov */ 209919c1b90eSArseny Krasnov if (sk->sk_shutdown & RCV_SHUTDOWN) { 210019c1b90eSArseny Krasnov err = 0; 210119c1b90eSArseny Krasnov goto out; 210219c1b90eSArseny Krasnov } 210319c1b90eSArseny Krasnov 210419c1b90eSArseny Krasnov /* It is valid on Linux to pass in a zero-length receive buffer. This 210519c1b90eSArseny Krasnov * is not an error. We may as well bail out now. 210619c1b90eSArseny Krasnov */ 210719c1b90eSArseny Krasnov if (!len) { 210819c1b90eSArseny Krasnov err = 0; 210919c1b90eSArseny Krasnov goto out; 211019c1b90eSArseny Krasnov } 211119c1b90eSArseny Krasnov 21129942c192SArseny Krasnov if (sk->sk_type == SOCK_STREAM) 211319c1b90eSArseny Krasnov err = __vsock_stream_recvmsg(sk, msg, len, flags); 21149942c192SArseny Krasnov else 21159942c192SArseny Krasnov err = __vsock_seqpacket_recvmsg(sk, msg, len, flags); 211619c1b90eSArseny Krasnov 211719c1b90eSArseny Krasnov out: 2118d021c344SAndy King release_sock(sk); 2119d021c344SAndy King return err; 2120d021c344SAndy King } 2121d021c344SAndy King 2122d021c344SAndy King static const struct proto_ops vsock_stream_ops = { 2123d021c344SAndy King .family = PF_VSOCK, 2124d021c344SAndy King .owner = THIS_MODULE, 2125d021c344SAndy King .release = vsock_release, 2126d021c344SAndy King .bind = vsock_bind, 2127a9e29e55SArseny Krasnov .connect = vsock_connect, 2128d021c344SAndy King .socketpair = sock_no_socketpair, 2129d021c344SAndy King .accept = vsock_accept, 2130d021c344SAndy King .getname = vsock_getname, 2131a11e1d43SLinus Torvalds .poll = vsock_poll, 2132d021c344SAndy King .ioctl = sock_no_ioctl, 2133d021c344SAndy King .listen = vsock_listen, 2134d021c344SAndy King .shutdown = vsock_shutdown, 2135a9e29e55SArseny Krasnov .setsockopt = vsock_connectible_setsockopt, 2136a9e29e55SArseny Krasnov .getsockopt = vsock_connectible_getsockopt, 2137a9e29e55SArseny Krasnov .sendmsg = vsock_connectible_sendmsg, 2138a9e29e55SArseny Krasnov .recvmsg = vsock_connectible_recvmsg, 2139d021c344SAndy King .mmap = sock_no_mmap, 2140d021c344SAndy King .sendpage = sock_no_sendpage, 2141d021c344SAndy King }; 2142d021c344SAndy King 2143*0798e78bSArseny Krasnov static const struct proto_ops vsock_seqpacket_ops = { 2144*0798e78bSArseny Krasnov .family = PF_VSOCK, 2145*0798e78bSArseny Krasnov .owner = THIS_MODULE, 2146*0798e78bSArseny Krasnov .release = vsock_release, 2147*0798e78bSArseny Krasnov .bind = vsock_bind, 2148*0798e78bSArseny Krasnov .connect = vsock_connect, 2149*0798e78bSArseny Krasnov .socketpair = sock_no_socketpair, 2150*0798e78bSArseny Krasnov .accept = vsock_accept, 2151*0798e78bSArseny Krasnov .getname = vsock_getname, 2152*0798e78bSArseny Krasnov .poll = vsock_poll, 2153*0798e78bSArseny Krasnov .ioctl = sock_no_ioctl, 2154*0798e78bSArseny Krasnov .listen = vsock_listen, 2155*0798e78bSArseny Krasnov .shutdown = vsock_shutdown, 2156*0798e78bSArseny Krasnov .setsockopt = vsock_connectible_setsockopt, 2157*0798e78bSArseny Krasnov .getsockopt = vsock_connectible_getsockopt, 2158*0798e78bSArseny Krasnov .sendmsg = vsock_connectible_sendmsg, 2159*0798e78bSArseny Krasnov .recvmsg = vsock_connectible_recvmsg, 2160*0798e78bSArseny Krasnov .mmap = sock_no_mmap, 2161*0798e78bSArseny Krasnov .sendpage = sock_no_sendpage, 2162*0798e78bSArseny Krasnov }; 2163*0798e78bSArseny Krasnov 2164d021c344SAndy King static int vsock_create(struct net *net, struct socket *sock, 2165d021c344SAndy King int protocol, int kern) 2166d021c344SAndy King { 2167c0cfa2d8SStefano Garzarella struct vsock_sock *vsk; 216855f3e149SStefano Garzarella struct sock *sk; 2169c0cfa2d8SStefano Garzarella int ret; 217055f3e149SStefano Garzarella 2171d021c344SAndy King if (!sock) 2172d021c344SAndy King return -EINVAL; 2173d021c344SAndy King 21746cf1c5fcSAndy King if (protocol && protocol != PF_VSOCK) 2175d021c344SAndy King return -EPROTONOSUPPORT; 2176d021c344SAndy King 2177d021c344SAndy King switch (sock->type) { 2178d021c344SAndy King case SOCK_DGRAM: 2179d021c344SAndy King sock->ops = &vsock_dgram_ops; 2180d021c344SAndy King break; 2181d021c344SAndy King case SOCK_STREAM: 2182d021c344SAndy King sock->ops = &vsock_stream_ops; 2183d021c344SAndy King break; 2184*0798e78bSArseny Krasnov case SOCK_SEQPACKET: 2185*0798e78bSArseny Krasnov sock->ops = &vsock_seqpacket_ops; 2186*0798e78bSArseny Krasnov break; 2187d021c344SAndy King default: 2188d021c344SAndy King return -ESOCKTNOSUPPORT; 2189d021c344SAndy King } 2190d021c344SAndy King 2191d021c344SAndy King sock->state = SS_UNCONNECTED; 2192d021c344SAndy King 219355f3e149SStefano Garzarella sk = __vsock_create(net, sock, NULL, GFP_KERNEL, 0, kern); 219455f3e149SStefano Garzarella if (!sk) 219555f3e149SStefano Garzarella return -ENOMEM; 219655f3e149SStefano Garzarella 2197c0cfa2d8SStefano Garzarella vsk = vsock_sk(sk); 2198c0cfa2d8SStefano Garzarella 2199c0cfa2d8SStefano Garzarella if (sock->type == SOCK_DGRAM) { 2200c0cfa2d8SStefano Garzarella ret = vsock_assign_transport(vsk, NULL); 2201c0cfa2d8SStefano Garzarella if (ret < 0) { 2202c0cfa2d8SStefano Garzarella sock_put(sk); 2203c0cfa2d8SStefano Garzarella return ret; 2204c0cfa2d8SStefano Garzarella } 2205c0cfa2d8SStefano Garzarella } 2206c0cfa2d8SStefano Garzarella 2207c0cfa2d8SStefano Garzarella vsock_insert_unbound(vsk); 220855f3e149SStefano Garzarella 220955f3e149SStefano Garzarella return 0; 2210d021c344SAndy King } 2211d021c344SAndy King 2212d021c344SAndy King static const struct net_proto_family vsock_family_ops = { 2213d021c344SAndy King .family = AF_VSOCK, 2214d021c344SAndy King .create = vsock_create, 2215d021c344SAndy King .owner = THIS_MODULE, 2216d021c344SAndy King }; 2217d021c344SAndy King 2218d021c344SAndy King static long vsock_dev_do_ioctl(struct file *filp, 2219d021c344SAndy King unsigned int cmd, void __user *ptr) 2220d021c344SAndy King { 2221d021c344SAndy King u32 __user *p = ptr; 2222c0cfa2d8SStefano Garzarella u32 cid = VMADDR_CID_ANY; 2223d021c344SAndy King int retval = 0; 2224d021c344SAndy King 2225d021c344SAndy King switch (cmd) { 2226d021c344SAndy King case IOCTL_VM_SOCKETS_GET_LOCAL_CID: 2227c0cfa2d8SStefano Garzarella /* To be compatible with the VMCI behavior, we prioritize the 2228c0cfa2d8SStefano Garzarella * guest CID instead of well-know host CID (VMADDR_CID_HOST). 2229c0cfa2d8SStefano Garzarella */ 2230c0cfa2d8SStefano Garzarella if (transport_g2h) 2231c0cfa2d8SStefano Garzarella cid = transport_g2h->get_local_cid(); 2232c0cfa2d8SStefano Garzarella else if (transport_h2g) 2233c0cfa2d8SStefano Garzarella cid = transport_h2g->get_local_cid(); 2234c0cfa2d8SStefano Garzarella 2235c0cfa2d8SStefano Garzarella if (put_user(cid, p) != 0) 2236d021c344SAndy King retval = -EFAULT; 2237d021c344SAndy King break; 2238d021c344SAndy King 2239d021c344SAndy King default: 2240c3e448cdSColin Ian King retval = -ENOIOCTLCMD; 2241d021c344SAndy King } 2242d021c344SAndy King 2243d021c344SAndy King return retval; 2244d021c344SAndy King } 2245d021c344SAndy King 2246d021c344SAndy King static long vsock_dev_ioctl(struct file *filp, 2247d021c344SAndy King unsigned int cmd, unsigned long arg) 2248d021c344SAndy King { 2249d021c344SAndy King return vsock_dev_do_ioctl(filp, cmd, (void __user *)arg); 2250d021c344SAndy King } 2251d021c344SAndy King 2252d021c344SAndy King #ifdef CONFIG_COMPAT 2253d021c344SAndy King static long vsock_dev_compat_ioctl(struct file *filp, 2254d021c344SAndy King unsigned int cmd, unsigned long arg) 2255d021c344SAndy King { 2256d021c344SAndy King return vsock_dev_do_ioctl(filp, cmd, compat_ptr(arg)); 2257d021c344SAndy King } 2258d021c344SAndy King #endif 2259d021c344SAndy King 2260d021c344SAndy King static const struct file_operations vsock_device_ops = { 2261d021c344SAndy King .owner = THIS_MODULE, 2262d021c344SAndy King .unlocked_ioctl = vsock_dev_ioctl, 2263d021c344SAndy King #ifdef CONFIG_COMPAT 2264d021c344SAndy King .compat_ioctl = vsock_dev_compat_ioctl, 2265d021c344SAndy King #endif 2266d021c344SAndy King .open = nonseekable_open, 2267d021c344SAndy King }; 2268d021c344SAndy King 2269d021c344SAndy King static struct miscdevice vsock_device = { 2270d021c344SAndy King .name = "vsock", 2271d021c344SAndy King .fops = &vsock_device_ops, 2272d021c344SAndy King }; 2273d021c344SAndy King 2274c0cfa2d8SStefano Garzarella static int __init vsock_init(void) 2275d021c344SAndy King { 2276c0cfa2d8SStefano Garzarella int err = 0; 22772c4a336eSAndy King 2278c0cfa2d8SStefano Garzarella vsock_init_tables(); 22792c4a336eSAndy King 2280c0cfa2d8SStefano Garzarella vsock_proto.owner = THIS_MODULE; 22816ad0b2f7SAsias He vsock_device.minor = MISC_DYNAMIC_MINOR; 2282d021c344SAndy King err = misc_register(&vsock_device); 2283d021c344SAndy King if (err) { 2284d021c344SAndy King pr_err("Failed to register misc device\n"); 2285f6a835bbSGao feng goto err_reset_transport; 2286d021c344SAndy King } 2287d021c344SAndy King 2288d021c344SAndy King err = proto_register(&vsock_proto, 1); /* we want our slab */ 2289d021c344SAndy King if (err) { 2290d021c344SAndy King pr_err("Cannot register vsock protocol\n"); 2291f6a835bbSGao feng goto err_deregister_misc; 2292d021c344SAndy King } 2293d021c344SAndy King 2294d021c344SAndy King err = sock_register(&vsock_family_ops); 2295d021c344SAndy King if (err) { 2296d021c344SAndy King pr_err("could not register af_vsock (%d) address family: %d\n", 2297d021c344SAndy King AF_VSOCK, err); 2298d021c344SAndy King goto err_unregister_proto; 2299d021c344SAndy King } 2300d021c344SAndy King 2301d021c344SAndy King return 0; 2302d021c344SAndy King 2303d021c344SAndy King err_unregister_proto: 2304d021c344SAndy King proto_unregister(&vsock_proto); 2305f6a835bbSGao feng err_deregister_misc: 2306d021c344SAndy King misc_deregister(&vsock_device); 2307f6a835bbSGao feng err_reset_transport: 2308d021c344SAndy King return err; 2309d021c344SAndy King } 2310d021c344SAndy King 2311c0cfa2d8SStefano Garzarella static void __exit vsock_exit(void) 2312d021c344SAndy King { 2313d021c344SAndy King misc_deregister(&vsock_device); 2314d021c344SAndy King sock_unregister(AF_VSOCK); 2315d021c344SAndy King proto_unregister(&vsock_proto); 2316d021c344SAndy King } 2317d021c344SAndy King 2318daabfbcaSStefano Garzarella const struct vsock_transport *vsock_core_get_transport(struct vsock_sock *vsk) 23190b01aeb3SStefan Hajnoczi { 2320daabfbcaSStefano Garzarella return vsk->transport; 23210b01aeb3SStefan Hajnoczi } 23220b01aeb3SStefan Hajnoczi EXPORT_SYMBOL_GPL(vsock_core_get_transport); 23230b01aeb3SStefan Hajnoczi 2324c0cfa2d8SStefano Garzarella int vsock_core_register(const struct vsock_transport *t, int features) 232505e489b1SStefan Hajnoczi { 23260e121905SStefano Garzarella const struct vsock_transport *t_h2g, *t_g2h, *t_dgram, *t_local; 2327c0cfa2d8SStefano Garzarella int err = mutex_lock_interruptible(&vsock_register_mutex); 2328c0cfa2d8SStefano Garzarella 2329c0cfa2d8SStefano Garzarella if (err) 2330c0cfa2d8SStefano Garzarella return err; 2331c0cfa2d8SStefano Garzarella 2332c0cfa2d8SStefano Garzarella t_h2g = transport_h2g; 2333c0cfa2d8SStefano Garzarella t_g2h = transport_g2h; 2334c0cfa2d8SStefano Garzarella t_dgram = transport_dgram; 23350e121905SStefano Garzarella t_local = transport_local; 2336c0cfa2d8SStefano Garzarella 2337c0cfa2d8SStefano Garzarella if (features & VSOCK_TRANSPORT_F_H2G) { 2338c0cfa2d8SStefano Garzarella if (t_h2g) { 2339c0cfa2d8SStefano Garzarella err = -EBUSY; 2340c0cfa2d8SStefano Garzarella goto err_busy; 2341c0cfa2d8SStefano Garzarella } 2342c0cfa2d8SStefano Garzarella t_h2g = t; 234305e489b1SStefan Hajnoczi } 234405e489b1SStefan Hajnoczi 2345c0cfa2d8SStefano Garzarella if (features & VSOCK_TRANSPORT_F_G2H) { 2346c0cfa2d8SStefano Garzarella if (t_g2h) { 2347c0cfa2d8SStefano Garzarella err = -EBUSY; 2348c0cfa2d8SStefano Garzarella goto err_busy; 2349c0cfa2d8SStefano Garzarella } 2350c0cfa2d8SStefano Garzarella t_g2h = t; 2351c0cfa2d8SStefano Garzarella } 2352c0cfa2d8SStefano Garzarella 2353c0cfa2d8SStefano Garzarella if (features & VSOCK_TRANSPORT_F_DGRAM) { 2354c0cfa2d8SStefano Garzarella if (t_dgram) { 2355c0cfa2d8SStefano Garzarella err = -EBUSY; 2356c0cfa2d8SStefano Garzarella goto err_busy; 2357c0cfa2d8SStefano Garzarella } 2358c0cfa2d8SStefano Garzarella t_dgram = t; 2359c0cfa2d8SStefano Garzarella } 2360c0cfa2d8SStefano Garzarella 23610e121905SStefano Garzarella if (features & VSOCK_TRANSPORT_F_LOCAL) { 23620e121905SStefano Garzarella if (t_local) { 23630e121905SStefano Garzarella err = -EBUSY; 23640e121905SStefano Garzarella goto err_busy; 23650e121905SStefano Garzarella } 23660e121905SStefano Garzarella t_local = t; 23670e121905SStefano Garzarella } 23680e121905SStefano Garzarella 2369c0cfa2d8SStefano Garzarella transport_h2g = t_h2g; 2370c0cfa2d8SStefano Garzarella transport_g2h = t_g2h; 2371c0cfa2d8SStefano Garzarella transport_dgram = t_dgram; 23720e121905SStefano Garzarella transport_local = t_local; 2373c0cfa2d8SStefano Garzarella 2374c0cfa2d8SStefano Garzarella err_busy: 2375c0cfa2d8SStefano Garzarella mutex_unlock(&vsock_register_mutex); 2376c0cfa2d8SStefano Garzarella return err; 2377c0cfa2d8SStefano Garzarella } 2378c0cfa2d8SStefano Garzarella EXPORT_SYMBOL_GPL(vsock_core_register); 2379c0cfa2d8SStefano Garzarella 2380c0cfa2d8SStefano Garzarella void vsock_core_unregister(const struct vsock_transport *t) 2381c0cfa2d8SStefano Garzarella { 2382c0cfa2d8SStefano Garzarella mutex_lock(&vsock_register_mutex); 2383c0cfa2d8SStefano Garzarella 2384c0cfa2d8SStefano Garzarella if (transport_h2g == t) 2385c0cfa2d8SStefano Garzarella transport_h2g = NULL; 2386c0cfa2d8SStefano Garzarella 2387c0cfa2d8SStefano Garzarella if (transport_g2h == t) 2388c0cfa2d8SStefano Garzarella transport_g2h = NULL; 2389c0cfa2d8SStefano Garzarella 2390c0cfa2d8SStefano Garzarella if (transport_dgram == t) 2391c0cfa2d8SStefano Garzarella transport_dgram = NULL; 2392c0cfa2d8SStefano Garzarella 23930e121905SStefano Garzarella if (transport_local == t) 23940e121905SStefano Garzarella transport_local = NULL; 23950e121905SStefano Garzarella 2396c0cfa2d8SStefano Garzarella mutex_unlock(&vsock_register_mutex); 2397c0cfa2d8SStefano Garzarella } 2398c0cfa2d8SStefano Garzarella EXPORT_SYMBOL_GPL(vsock_core_unregister); 2399c0cfa2d8SStefano Garzarella 2400c0cfa2d8SStefano Garzarella module_init(vsock_init); 240105e489b1SStefan Hajnoczi module_exit(vsock_exit); 2402c1eef220SCong Wang 2403d021c344SAndy King MODULE_AUTHOR("VMware, Inc."); 2404d021c344SAndy King MODULE_DESCRIPTION("VMware Virtual Socket Family"); 24051190cfdbSJorgen Hansen MODULE_VERSION("1.0.2.0-k"); 2406d021c344SAndy King MODULE_LICENSE("GPL v2"); 2407