1685a6bf8SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only 2d021c344SAndy King /* 3d021c344SAndy King * VMware vSockets Driver 4d021c344SAndy King * 5d021c344SAndy King * Copyright (C) 2007-2013 VMware, Inc. All rights reserved. 6d021c344SAndy King */ 7d021c344SAndy King 8d021c344SAndy King /* Implementation notes: 9d021c344SAndy King * 10d021c344SAndy King * - There are two kinds of sockets: those created by user action (such as 11d021c344SAndy King * calling socket(2)) and those created by incoming connection request packets. 12d021c344SAndy King * 13d021c344SAndy King * - There are two "global" tables, one for bound sockets (sockets that have 14d021c344SAndy King * specified an address that they are responsible for) and one for connected 15d021c344SAndy King * sockets (sockets that have established a connection with another socket). 16d021c344SAndy King * These tables are "global" in that all sockets on the system are placed 17d021c344SAndy King * within them. - Note, though, that the bound table contains an extra entry 18d021c344SAndy King * for a list of unbound sockets and SOCK_DGRAM sockets will always remain in 19d021c344SAndy King * that list. The bound table is used solely for lookup of sockets when packets 20d021c344SAndy King * are received and that's not necessary for SOCK_DGRAM sockets since we create 21d021c344SAndy King * a datagram handle for each and need not perform a lookup. Keeping SOCK_DGRAM 22d021c344SAndy King * sockets out of the bound hash buckets will reduce the chance of collisions 23d021c344SAndy King * when looking for SOCK_STREAM sockets and prevents us from having to check the 24d021c344SAndy King * socket type in the hash table lookups. 25d021c344SAndy King * 26d021c344SAndy King * - Sockets created by user action will either be "client" sockets that 27d021c344SAndy King * initiate a connection or "server" sockets that listen for connections; we do 28d021c344SAndy King * not support simultaneous connects (two "client" sockets connecting). 29d021c344SAndy King * 30d021c344SAndy King * - "Server" sockets are referred to as listener sockets throughout this 313b4477d2SStefan Hajnoczi * implementation because they are in the TCP_LISTEN state. When a 32ea3803c1SStefan Hajnoczi * connection request is received (the second kind of socket mentioned above), 33ea3803c1SStefan Hajnoczi * we create a new socket and refer to it as a pending socket. These pending 34ea3803c1SStefan Hajnoczi * sockets are placed on the pending connection list of the listener socket. 35ea3803c1SStefan Hajnoczi * When future packets are received for the address the listener socket is 36ea3803c1SStefan Hajnoczi * bound to, we check if the source of the packet is from one that has an 37ea3803c1SStefan Hajnoczi * existing pending connection. If it does, we process the packet for the 38ea3803c1SStefan Hajnoczi * pending socket. When that socket reaches the connected state, it is removed 39ea3803c1SStefan Hajnoczi * from the listener socket's pending list and enqueued in the listener 40ea3803c1SStefan Hajnoczi * socket's accept queue. Callers of accept(2) will accept connected sockets 41ea3803c1SStefan Hajnoczi * from the listener socket's accept queue. If the socket cannot be accepted 42ea3803c1SStefan Hajnoczi * for some reason then it is marked rejected. Once the connection is 43ea3803c1SStefan Hajnoczi * accepted, it is owned by the user process and the responsibility for cleanup 44ea3803c1SStefan Hajnoczi * falls with that user process. 45d021c344SAndy King * 46d021c344SAndy King * - It is possible that these pending sockets will never reach the connected 47d021c344SAndy King * state; in fact, we may never receive another packet after the connection 48d021c344SAndy King * request. Because of this, we must schedule a cleanup function to run in the 49d021c344SAndy King * future, after some amount of time passes where a connection should have been 50d021c344SAndy King * established. This function ensures that the socket is off all lists so it 51d021c344SAndy King * cannot be retrieved, then drops all references to the socket so it is cleaned 52d021c344SAndy King * up (sock_put() -> sk_free() -> our sk_destruct implementation). Note this 53d021c344SAndy King * function will also cleanup rejected sockets, those that reach the connected 54d021c344SAndy King * state but leave it before they have been accepted. 55d021c344SAndy King * 564192f672SStefan Hajnoczi * - Lock ordering for pending or accept queue sockets is: 574192f672SStefan Hajnoczi * 584192f672SStefan Hajnoczi * lock_sock(listener); 594192f672SStefan Hajnoczi * lock_sock_nested(pending, SINGLE_DEPTH_NESTING); 604192f672SStefan Hajnoczi * 614192f672SStefan Hajnoczi * Using explicit nested locking keeps lockdep happy since normally only one 624192f672SStefan Hajnoczi * lock of a given class may be taken at a time. 634192f672SStefan Hajnoczi * 64d021c344SAndy King * - Sockets created by user action will be cleaned up when the user process 65d021c344SAndy King * calls close(2), causing our release implementation to be called. Our release 66d021c344SAndy King * implementation will perform some cleanup then drop the last reference so our 67d021c344SAndy King * sk_destruct implementation is invoked. Our sk_destruct implementation will 68d021c344SAndy King * perform additional cleanup that's common for both types of sockets. 69d021c344SAndy King * 70d021c344SAndy King * - A socket's reference count is what ensures that the structure won't be 71d021c344SAndy King * freed. Each entry in a list (such as the "global" bound and connected tables 72d021c344SAndy King * and the listener socket's pending list and connected queue) ensures a 73d021c344SAndy King * reference. When we defer work until process context and pass a socket as our 74d021c344SAndy King * argument, we must ensure the reference count is increased to ensure the 75d021c344SAndy King * socket isn't freed before the function is run; the deferred function will 76d021c344SAndy King * then drop the reference. 773b4477d2SStefan Hajnoczi * 783b4477d2SStefan Hajnoczi * - sk->sk_state uses the TCP state constants because they are widely used by 793b4477d2SStefan Hajnoczi * other address families and exposed to userspace tools like ss(8): 803b4477d2SStefan Hajnoczi * 813b4477d2SStefan Hajnoczi * TCP_CLOSE - unconnected 823b4477d2SStefan Hajnoczi * TCP_SYN_SENT - connecting 833b4477d2SStefan Hajnoczi * TCP_ESTABLISHED - connected 843b4477d2SStefan Hajnoczi * TCP_CLOSING - disconnecting 853b4477d2SStefan Hajnoczi * TCP_LISTEN - listening 86d021c344SAndy King */ 87d021c344SAndy King 88b6459415SJakub Kicinski #include <linux/compat.h> 89d021c344SAndy King #include <linux/types.h> 90d021c344SAndy King #include <linux/bitops.h> 91d021c344SAndy King #include <linux/cred.h> 92d021c344SAndy King #include <linux/init.h> 93d021c344SAndy King #include <linux/io.h> 94d021c344SAndy King #include <linux/kernel.h> 95174cd4b1SIngo Molnar #include <linux/sched/signal.h> 96d021c344SAndy King #include <linux/kmod.h> 97d021c344SAndy King #include <linux/list.h> 98d021c344SAndy King #include <linux/miscdevice.h> 99d021c344SAndy King #include <linux/module.h> 100d021c344SAndy King #include <linux/mutex.h> 101d021c344SAndy King #include <linux/net.h> 102d021c344SAndy King #include <linux/poll.h> 1038236b08cSLepton Wu #include <linux/random.h> 104d021c344SAndy King #include <linux/skbuff.h> 105d021c344SAndy King #include <linux/smp.h> 106d021c344SAndy King #include <linux/socket.h> 107d021c344SAndy King #include <linux/stddef.h> 108d021c344SAndy King #include <linux/unistd.h> 109d021c344SAndy King #include <linux/wait.h> 110d021c344SAndy King #include <linux/workqueue.h> 111d021c344SAndy King #include <net/sock.h> 11282a54d0eSAsias He #include <net/af_vsock.h> 113d021c344SAndy King 114d021c344SAndy King static int __vsock_bind(struct sock *sk, struct sockaddr_vm *addr); 115d021c344SAndy King static void vsock_sk_destruct(struct sock *sk); 116d021c344SAndy King static int vsock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb); 117d021c344SAndy King 118d021c344SAndy King /* Protocol family. */ 119d021c344SAndy King static struct proto vsock_proto = { 120d021c344SAndy King .name = "AF_VSOCK", 121d021c344SAndy King .owner = THIS_MODULE, 122d021c344SAndy King .obj_size = sizeof(struct vsock_sock), 123d021c344SAndy King }; 124d021c344SAndy King 125d021c344SAndy King /* The default peer timeout indicates how long we will wait for a peer response 126d021c344SAndy King * to a control message. 127d021c344SAndy King */ 128d021c344SAndy King #define VSOCK_DEFAULT_CONNECT_TIMEOUT (2 * HZ) 129d021c344SAndy King 130b9f2b0ffSStefano Garzarella #define VSOCK_DEFAULT_BUFFER_SIZE (1024 * 256) 131b9f2b0ffSStefano Garzarella #define VSOCK_DEFAULT_BUFFER_MAX_SIZE (1024 * 256) 132b9f2b0ffSStefano Garzarella #define VSOCK_DEFAULT_BUFFER_MIN_SIZE 128 133b9f2b0ffSStefano Garzarella 134c0cfa2d8SStefano Garzarella /* Transport used for host->guest communication */ 135c0cfa2d8SStefano Garzarella static const struct vsock_transport *transport_h2g; 136c0cfa2d8SStefano Garzarella /* Transport used for guest->host communication */ 137c0cfa2d8SStefano Garzarella static const struct vsock_transport *transport_g2h; 138c0cfa2d8SStefano Garzarella /* Transport used for DGRAM communication */ 139c0cfa2d8SStefano Garzarella static const struct vsock_transport *transport_dgram; 1400e121905SStefano Garzarella /* Transport used for local communication */ 1410e121905SStefano Garzarella static const struct vsock_transport *transport_local; 142d021c344SAndy King static DEFINE_MUTEX(vsock_register_mutex); 143d021c344SAndy King 144d021c344SAndy King /**** UTILS ****/ 145d021c344SAndy King 146d021c344SAndy King /* Each bound VSocket is stored in the bind hash table and each connected 147d021c344SAndy King * VSocket is stored in the connected hash table. 148d021c344SAndy King * 149d021c344SAndy King * Unbound sockets are all put on the same list attached to the end of the hash 150d021c344SAndy King * table (vsock_unbound_sockets). Bound sockets are added to the hash table in 151d021c344SAndy King * the bucket that their local address hashes to (vsock_bound_sockets(addr) 152d021c344SAndy King * represents the list that addr hashes to). 153d021c344SAndy King * 154d021c344SAndy King * Specifically, we initialize the vsock_bind_table array to a size of 155d021c344SAndy King * VSOCK_HASH_SIZE + 1 so that vsock_bind_table[0] through 156d021c344SAndy King * vsock_bind_table[VSOCK_HASH_SIZE - 1] are for bound sockets and 157d021c344SAndy King * vsock_bind_table[VSOCK_HASH_SIZE] is for unbound sockets. The hash function 158a49dd9dcSAsias He * mods with VSOCK_HASH_SIZE to ensure this. 159d021c344SAndy King */ 160d021c344SAndy King #define MAX_PORT_RETRIES 24 161d021c344SAndy King 162a49dd9dcSAsias He #define VSOCK_HASH(addr) ((addr)->svm_port % VSOCK_HASH_SIZE) 163d021c344SAndy King #define vsock_bound_sockets(addr) (&vsock_bind_table[VSOCK_HASH(addr)]) 164d021c344SAndy King #define vsock_unbound_sockets (&vsock_bind_table[VSOCK_HASH_SIZE]) 165d021c344SAndy King 166d021c344SAndy King /* XXX This can probably be implemented in a better way. */ 167d021c344SAndy King #define VSOCK_CONN_HASH(src, dst) \ 168a49dd9dcSAsias He (((src)->svm_cid ^ (dst)->svm_port) % VSOCK_HASH_SIZE) 169d021c344SAndy King #define vsock_connected_sockets(src, dst) \ 170d021c344SAndy King (&vsock_connected_table[VSOCK_CONN_HASH(src, dst)]) 171d021c344SAndy King #define vsock_connected_sockets_vsk(vsk) \ 172d021c344SAndy King vsock_connected_sockets(&(vsk)->remote_addr, &(vsk)->local_addr) 173d021c344SAndy King 17444f20980SStefan Hajnoczi struct list_head vsock_bind_table[VSOCK_HASH_SIZE + 1]; 17544f20980SStefan Hajnoczi EXPORT_SYMBOL_GPL(vsock_bind_table); 17644f20980SStefan Hajnoczi struct list_head vsock_connected_table[VSOCK_HASH_SIZE]; 17744f20980SStefan Hajnoczi EXPORT_SYMBOL_GPL(vsock_connected_table); 17844f20980SStefan Hajnoczi DEFINE_SPINLOCK(vsock_table_lock); 17944f20980SStefan Hajnoczi EXPORT_SYMBOL_GPL(vsock_table_lock); 180d021c344SAndy King 181b3a6dfe8SAsias He /* Autobind this socket to the local address if necessary. */ 182b3a6dfe8SAsias He static int vsock_auto_bind(struct vsock_sock *vsk) 183b3a6dfe8SAsias He { 184b3a6dfe8SAsias He struct sock *sk = sk_vsock(vsk); 185b3a6dfe8SAsias He struct sockaddr_vm local_addr; 186b3a6dfe8SAsias He 187b3a6dfe8SAsias He if (vsock_addr_bound(&vsk->local_addr)) 188b3a6dfe8SAsias He return 0; 189b3a6dfe8SAsias He vsock_addr_init(&local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); 190b3a6dfe8SAsias He return __vsock_bind(sk, &local_addr); 191b3a6dfe8SAsias He } 192b3a6dfe8SAsias He 193c0cfa2d8SStefano Garzarella static void vsock_init_tables(void) 194d021c344SAndy King { 195d021c344SAndy King int i; 196d021c344SAndy King 197d021c344SAndy King for (i = 0; i < ARRAY_SIZE(vsock_bind_table); i++) 198d021c344SAndy King INIT_LIST_HEAD(&vsock_bind_table[i]); 199d021c344SAndy King 200d021c344SAndy King for (i = 0; i < ARRAY_SIZE(vsock_connected_table); i++) 201d021c344SAndy King INIT_LIST_HEAD(&vsock_connected_table[i]); 202d021c344SAndy King } 203d021c344SAndy King 204d021c344SAndy King static void __vsock_insert_bound(struct list_head *list, 205d021c344SAndy King struct vsock_sock *vsk) 206d021c344SAndy King { 207d021c344SAndy King sock_hold(&vsk->sk); 208d021c344SAndy King list_add(&vsk->bound_table, list); 209d021c344SAndy King } 210d021c344SAndy King 211d021c344SAndy King static void __vsock_insert_connected(struct list_head *list, 212d021c344SAndy King struct vsock_sock *vsk) 213d021c344SAndy King { 214d021c344SAndy King sock_hold(&vsk->sk); 215d021c344SAndy King list_add(&vsk->connected_table, list); 216d021c344SAndy King } 217d021c344SAndy King 218d021c344SAndy King static void __vsock_remove_bound(struct vsock_sock *vsk) 219d021c344SAndy King { 220d021c344SAndy King list_del_init(&vsk->bound_table); 221d021c344SAndy King sock_put(&vsk->sk); 222d021c344SAndy King } 223d021c344SAndy King 224d021c344SAndy King static void __vsock_remove_connected(struct vsock_sock *vsk) 225d021c344SAndy King { 226d021c344SAndy King list_del_init(&vsk->connected_table); 227d021c344SAndy King sock_put(&vsk->sk); 228d021c344SAndy King } 229d021c344SAndy King 230d021c344SAndy King static struct sock *__vsock_find_bound_socket(struct sockaddr_vm *addr) 231d021c344SAndy King { 232d021c344SAndy King struct vsock_sock *vsk; 233d021c344SAndy King 23436c5b48bSStefano Garzarella list_for_each_entry(vsk, vsock_bound_sockets(addr), bound_table) { 23536c5b48bSStefano Garzarella if (vsock_addr_equals_addr(addr, &vsk->local_addr)) 236d021c344SAndy King return sk_vsock(vsk); 237d021c344SAndy King 23836c5b48bSStefano Garzarella if (addr->svm_port == vsk->local_addr.svm_port && 23936c5b48bSStefano Garzarella (vsk->local_addr.svm_cid == VMADDR_CID_ANY || 24036c5b48bSStefano Garzarella addr->svm_cid == VMADDR_CID_ANY)) 24136c5b48bSStefano Garzarella return sk_vsock(vsk); 24236c5b48bSStefano Garzarella } 24336c5b48bSStefano Garzarella 244d021c344SAndy King return NULL; 245d021c344SAndy King } 246d021c344SAndy King 247d021c344SAndy King static struct sock *__vsock_find_connected_socket(struct sockaddr_vm *src, 248d021c344SAndy King struct sockaddr_vm *dst) 249d021c344SAndy King { 250d021c344SAndy King struct vsock_sock *vsk; 251d021c344SAndy King 252d021c344SAndy King list_for_each_entry(vsk, vsock_connected_sockets(src, dst), 253d021c344SAndy King connected_table) { 254990454b5SReilly Grant if (vsock_addr_equals_addr(src, &vsk->remote_addr) && 255990454b5SReilly Grant dst->svm_port == vsk->local_addr.svm_port) { 256d021c344SAndy King return sk_vsock(vsk); 257d021c344SAndy King } 258d021c344SAndy King } 259d021c344SAndy King 260d021c344SAndy King return NULL; 261d021c344SAndy King } 262d021c344SAndy King 263d021c344SAndy King static void vsock_insert_unbound(struct vsock_sock *vsk) 264d021c344SAndy King { 265d021c344SAndy King spin_lock_bh(&vsock_table_lock); 266d021c344SAndy King __vsock_insert_bound(vsock_unbound_sockets, vsk); 267d021c344SAndy King spin_unlock_bh(&vsock_table_lock); 268d021c344SAndy King } 269d021c344SAndy King 270d021c344SAndy King void vsock_insert_connected(struct vsock_sock *vsk) 271d021c344SAndy King { 272d021c344SAndy King struct list_head *list = vsock_connected_sockets( 273d021c344SAndy King &vsk->remote_addr, &vsk->local_addr); 274d021c344SAndy King 275d021c344SAndy King spin_lock_bh(&vsock_table_lock); 276d021c344SAndy King __vsock_insert_connected(list, vsk); 277d021c344SAndy King spin_unlock_bh(&vsock_table_lock); 278d021c344SAndy King } 279d021c344SAndy King EXPORT_SYMBOL_GPL(vsock_insert_connected); 280d021c344SAndy King 281d021c344SAndy King void vsock_remove_bound(struct vsock_sock *vsk) 282d021c344SAndy King { 283d021c344SAndy King spin_lock_bh(&vsock_table_lock); 284d5afa82cSSunil Muthuswamy if (__vsock_in_bound_table(vsk)) 285d021c344SAndy King __vsock_remove_bound(vsk); 286d021c344SAndy King spin_unlock_bh(&vsock_table_lock); 287d021c344SAndy King } 288d021c344SAndy King EXPORT_SYMBOL_GPL(vsock_remove_bound); 289d021c344SAndy King 290d021c344SAndy King void vsock_remove_connected(struct vsock_sock *vsk) 291d021c344SAndy King { 292d021c344SAndy King spin_lock_bh(&vsock_table_lock); 293d5afa82cSSunil Muthuswamy if (__vsock_in_connected_table(vsk)) 294d021c344SAndy King __vsock_remove_connected(vsk); 295d021c344SAndy King spin_unlock_bh(&vsock_table_lock); 296d021c344SAndy King } 297d021c344SAndy King EXPORT_SYMBOL_GPL(vsock_remove_connected); 298d021c344SAndy King 299d021c344SAndy King struct sock *vsock_find_bound_socket(struct sockaddr_vm *addr) 300d021c344SAndy King { 301d021c344SAndy King struct sock *sk; 302d021c344SAndy King 303d021c344SAndy King spin_lock_bh(&vsock_table_lock); 304d021c344SAndy King sk = __vsock_find_bound_socket(addr); 305d021c344SAndy King if (sk) 306d021c344SAndy King sock_hold(sk); 307d021c344SAndy King 308d021c344SAndy King spin_unlock_bh(&vsock_table_lock); 309d021c344SAndy King 310d021c344SAndy King return sk; 311d021c344SAndy King } 312d021c344SAndy King EXPORT_SYMBOL_GPL(vsock_find_bound_socket); 313d021c344SAndy King 314d021c344SAndy King struct sock *vsock_find_connected_socket(struct sockaddr_vm *src, 315d021c344SAndy King struct sockaddr_vm *dst) 316d021c344SAndy King { 317d021c344SAndy King struct sock *sk; 318d021c344SAndy King 319d021c344SAndy King spin_lock_bh(&vsock_table_lock); 320d021c344SAndy King sk = __vsock_find_connected_socket(src, dst); 321d021c344SAndy King if (sk) 322d021c344SAndy King sock_hold(sk); 323d021c344SAndy King 324d021c344SAndy King spin_unlock_bh(&vsock_table_lock); 325d021c344SAndy King 326d021c344SAndy King return sk; 327d021c344SAndy King } 328d021c344SAndy King EXPORT_SYMBOL_GPL(vsock_find_connected_socket); 329d021c344SAndy King 3306773b7dcSStefan Hajnoczi void vsock_remove_sock(struct vsock_sock *vsk) 3316773b7dcSStefan Hajnoczi { 3326773b7dcSStefan Hajnoczi vsock_remove_bound(vsk); 3336773b7dcSStefan Hajnoczi vsock_remove_connected(vsk); 3346773b7dcSStefan Hajnoczi } 3356773b7dcSStefan Hajnoczi EXPORT_SYMBOL_GPL(vsock_remove_sock); 3366773b7dcSStefan Hajnoczi 3378e6ed963SJiyong Park void vsock_for_each_connected_socket(struct vsock_transport *transport, 3388e6ed963SJiyong Park void (*fn)(struct sock *sk)) 339d021c344SAndy King { 340d021c344SAndy King int i; 341d021c344SAndy King 342d021c344SAndy King spin_lock_bh(&vsock_table_lock); 343d021c344SAndy King 344d021c344SAndy King for (i = 0; i < ARRAY_SIZE(vsock_connected_table); i++) { 345d021c344SAndy King struct vsock_sock *vsk; 346d021c344SAndy King list_for_each_entry(vsk, &vsock_connected_table[i], 3478e6ed963SJiyong Park connected_table) { 3488e6ed963SJiyong Park if (vsk->transport != transport) 3498e6ed963SJiyong Park continue; 3508e6ed963SJiyong Park 351d021c344SAndy King fn(sk_vsock(vsk)); 352d021c344SAndy King } 3538e6ed963SJiyong Park } 354d021c344SAndy King 355d021c344SAndy King spin_unlock_bh(&vsock_table_lock); 356d021c344SAndy King } 357d021c344SAndy King EXPORT_SYMBOL_GPL(vsock_for_each_connected_socket); 358d021c344SAndy King 359d021c344SAndy King void vsock_add_pending(struct sock *listener, struct sock *pending) 360d021c344SAndy King { 361d021c344SAndy King struct vsock_sock *vlistener; 362d021c344SAndy King struct vsock_sock *vpending; 363d021c344SAndy King 364d021c344SAndy King vlistener = vsock_sk(listener); 365d021c344SAndy King vpending = vsock_sk(pending); 366d021c344SAndy King 367d021c344SAndy King sock_hold(pending); 368d021c344SAndy King sock_hold(listener); 369d021c344SAndy King list_add_tail(&vpending->pending_links, &vlistener->pending_links); 370d021c344SAndy King } 371d021c344SAndy King EXPORT_SYMBOL_GPL(vsock_add_pending); 372d021c344SAndy King 373d021c344SAndy King void vsock_remove_pending(struct sock *listener, struct sock *pending) 374d021c344SAndy King { 375d021c344SAndy King struct vsock_sock *vpending = vsock_sk(pending); 376d021c344SAndy King 377d021c344SAndy King list_del_init(&vpending->pending_links); 378d021c344SAndy King sock_put(listener); 379d021c344SAndy King sock_put(pending); 380d021c344SAndy King } 381d021c344SAndy King EXPORT_SYMBOL_GPL(vsock_remove_pending); 382d021c344SAndy King 383d021c344SAndy King void vsock_enqueue_accept(struct sock *listener, struct sock *connected) 384d021c344SAndy King { 385d021c344SAndy King struct vsock_sock *vlistener; 386d021c344SAndy King struct vsock_sock *vconnected; 387d021c344SAndy King 388d021c344SAndy King vlistener = vsock_sk(listener); 389d021c344SAndy King vconnected = vsock_sk(connected); 390d021c344SAndy King 391d021c344SAndy King sock_hold(connected); 392d021c344SAndy King sock_hold(listener); 393d021c344SAndy King list_add_tail(&vconnected->accept_queue, &vlistener->accept_queue); 394d021c344SAndy King } 395d021c344SAndy King EXPORT_SYMBOL_GPL(vsock_enqueue_accept); 396d021c344SAndy King 397408624afSStefano Garzarella static bool vsock_use_local_transport(unsigned int remote_cid) 398408624afSStefano Garzarella { 399408624afSStefano Garzarella if (!transport_local) 400408624afSStefano Garzarella return false; 401408624afSStefano Garzarella 402408624afSStefano Garzarella if (remote_cid == VMADDR_CID_LOCAL) 403408624afSStefano Garzarella return true; 404408624afSStefano Garzarella 405408624afSStefano Garzarella if (transport_g2h) { 406408624afSStefano Garzarella return remote_cid == transport_g2h->get_local_cid(); 407408624afSStefano Garzarella } else { 408408624afSStefano Garzarella return remote_cid == VMADDR_CID_HOST; 409408624afSStefano Garzarella } 410408624afSStefano Garzarella } 411408624afSStefano Garzarella 4126a2c0962SStefano Garzarella static void vsock_deassign_transport(struct vsock_sock *vsk) 4136a2c0962SStefano Garzarella { 4146a2c0962SStefano Garzarella if (!vsk->transport) 4156a2c0962SStefano Garzarella return; 4166a2c0962SStefano Garzarella 4176a2c0962SStefano Garzarella vsk->transport->destruct(vsk); 4186a2c0962SStefano Garzarella module_put(vsk->transport->module); 4196a2c0962SStefano Garzarella vsk->transport = NULL; 4206a2c0962SStefano Garzarella } 4216a2c0962SStefano Garzarella 422c0cfa2d8SStefano Garzarella /* Assign a transport to a socket and call the .init transport callback. 423c0cfa2d8SStefano Garzarella * 4248cb48554SArseny Krasnov * Note: for connection oriented socket this must be called when vsk->remote_addr 4258cb48554SArseny Krasnov * is set (e.g. during the connect() or when a connection request on a listener 426c0cfa2d8SStefano Garzarella * socket is received). 427c0cfa2d8SStefano Garzarella * The vsk->remote_addr is used to decide which transport to use: 428408624afSStefano Garzarella * - remote CID == VMADDR_CID_LOCAL or g2h->local_cid or VMADDR_CID_HOST if 429408624afSStefano Garzarella * g2h is not loaded, will use local transport; 4307f816984SAndra Paraschiv * - remote CID <= VMADDR_CID_HOST or h2g is not loaded or remote flags field 4317f816984SAndra Paraschiv * includes VMADDR_FLAG_TO_HOST flag value, will use guest->host transport; 432c0cfa2d8SStefano Garzarella * - remote CID > VMADDR_CID_HOST will use host->guest transport; 433c0cfa2d8SStefano Garzarella */ 434c0cfa2d8SStefano Garzarella int vsock_assign_transport(struct vsock_sock *vsk, struct vsock_sock *psk) 435c0cfa2d8SStefano Garzarella { 436c0cfa2d8SStefano Garzarella const struct vsock_transport *new_transport; 437c0cfa2d8SStefano Garzarella struct sock *sk = sk_vsock(vsk); 438c0cfa2d8SStefano Garzarella unsigned int remote_cid = vsk->remote_addr.svm_cid; 4397f816984SAndra Paraschiv __u8 remote_flags; 440039fcccaSStefano Garzarella int ret; 441c0cfa2d8SStefano Garzarella 4421b5f2ab9SAndra Paraschiv /* If the packet is coming with the source and destination CIDs higher 4431b5f2ab9SAndra Paraschiv * than VMADDR_CID_HOST, then a vsock channel where all the packets are 4441b5f2ab9SAndra Paraschiv * forwarded to the host should be established. Then the host will 4451b5f2ab9SAndra Paraschiv * need to forward the packets to the guest. 4461b5f2ab9SAndra Paraschiv * 4471b5f2ab9SAndra Paraschiv * The flag is set on the (listen) receive path (psk is not NULL). On 4481b5f2ab9SAndra Paraschiv * the connect path the flag can be set by the user space application. 4491b5f2ab9SAndra Paraschiv */ 4501b5f2ab9SAndra Paraschiv if (psk && vsk->local_addr.svm_cid > VMADDR_CID_HOST && 4511b5f2ab9SAndra Paraschiv vsk->remote_addr.svm_cid > VMADDR_CID_HOST) 4521b5f2ab9SAndra Paraschiv vsk->remote_addr.svm_flags |= VMADDR_FLAG_TO_HOST; 4531b5f2ab9SAndra Paraschiv 4547f816984SAndra Paraschiv remote_flags = vsk->remote_addr.svm_flags; 4557f816984SAndra Paraschiv 456c0cfa2d8SStefano Garzarella switch (sk->sk_type) { 457c0cfa2d8SStefano Garzarella case SOCK_DGRAM: 458c0cfa2d8SStefano Garzarella new_transport = transport_dgram; 459c0cfa2d8SStefano Garzarella break; 460c0cfa2d8SStefano Garzarella case SOCK_STREAM: 4610798e78bSArseny Krasnov case SOCK_SEQPACKET: 462408624afSStefano Garzarella if (vsock_use_local_transport(remote_cid)) 463408624afSStefano Garzarella new_transport = transport_local; 4647f816984SAndra Paraschiv else if (remote_cid <= VMADDR_CID_HOST || !transport_h2g || 4657f816984SAndra Paraschiv (remote_flags & VMADDR_FLAG_TO_HOST)) 466c0cfa2d8SStefano Garzarella new_transport = transport_g2h; 467c0cfa2d8SStefano Garzarella else 468c0cfa2d8SStefano Garzarella new_transport = transport_h2g; 469c0cfa2d8SStefano Garzarella break; 470c0cfa2d8SStefano Garzarella default: 471c0cfa2d8SStefano Garzarella return -ESOCKTNOSUPPORT; 472c0cfa2d8SStefano Garzarella } 473c0cfa2d8SStefano Garzarella 474c0cfa2d8SStefano Garzarella if (vsk->transport) { 475c0cfa2d8SStefano Garzarella if (vsk->transport == new_transport) 476c0cfa2d8SStefano Garzarella return 0; 477c0cfa2d8SStefano Garzarella 4783f74957fSStefano Garzarella /* transport->release() must be called with sock lock acquired. 4798cb48554SArseny Krasnov * This path can only be taken during vsock_connect(), where we 4808cb48554SArseny Krasnov * have already held the sock lock. In the other cases, this 4818cb48554SArseny Krasnov * function is called on a new socket which is not assigned to 4828cb48554SArseny Krasnov * any transport. 4833f74957fSStefano Garzarella */ 484c0cfa2d8SStefano Garzarella vsk->transport->release(vsk); 4856a2c0962SStefano Garzarella vsock_deassign_transport(vsk); 486c0cfa2d8SStefano Garzarella } 487c0cfa2d8SStefano Garzarella 4886a2c0962SStefano Garzarella /* We increase the module refcnt to prevent the transport unloading 4896a2c0962SStefano Garzarella * while there are open sockets assigned to it. 4906a2c0962SStefano Garzarella */ 4916a2c0962SStefano Garzarella if (!new_transport || !try_module_get(new_transport->module)) 492c0cfa2d8SStefano Garzarella return -ENODEV; 493c0cfa2d8SStefano Garzarella 4940798e78bSArseny Krasnov if (sk->sk_type == SOCK_SEQPACKET) { 4950798e78bSArseny Krasnov if (!new_transport->seqpacket_allow || 4960798e78bSArseny Krasnov !new_transport->seqpacket_allow(remote_cid)) { 4970798e78bSArseny Krasnov module_put(new_transport->module); 4980798e78bSArseny Krasnov return -ESOCKTNOSUPPORT; 4990798e78bSArseny Krasnov } 5000798e78bSArseny Krasnov } 5010798e78bSArseny Krasnov 502039fcccaSStefano Garzarella ret = new_transport->init(vsk, psk); 503039fcccaSStefano Garzarella if (ret) { 504039fcccaSStefano Garzarella module_put(new_transport->module); 505039fcccaSStefano Garzarella return ret; 506039fcccaSStefano Garzarella } 507039fcccaSStefano Garzarella 508c0cfa2d8SStefano Garzarella vsk->transport = new_transport; 509c0cfa2d8SStefano Garzarella 510039fcccaSStefano Garzarella return 0; 511c0cfa2d8SStefano Garzarella } 512c0cfa2d8SStefano Garzarella EXPORT_SYMBOL_GPL(vsock_assign_transport); 513c0cfa2d8SStefano Garzarella 514c0cfa2d8SStefano Garzarella bool vsock_find_cid(unsigned int cid) 515c0cfa2d8SStefano Garzarella { 516c0cfa2d8SStefano Garzarella if (transport_g2h && cid == transport_g2h->get_local_cid()) 517c0cfa2d8SStefano Garzarella return true; 518c0cfa2d8SStefano Garzarella 519c0cfa2d8SStefano Garzarella if (transport_h2g && cid == VMADDR_CID_HOST) 520c0cfa2d8SStefano Garzarella return true; 521c0cfa2d8SStefano Garzarella 522408624afSStefano Garzarella if (transport_local && cid == VMADDR_CID_LOCAL) 523408624afSStefano Garzarella return true; 524408624afSStefano Garzarella 525c0cfa2d8SStefano Garzarella return false; 526c0cfa2d8SStefano Garzarella } 527c0cfa2d8SStefano Garzarella EXPORT_SYMBOL_GPL(vsock_find_cid); 528c0cfa2d8SStefano Garzarella 529d021c344SAndy King static struct sock *vsock_dequeue_accept(struct sock *listener) 530d021c344SAndy King { 531d021c344SAndy King struct vsock_sock *vlistener; 532d021c344SAndy King struct vsock_sock *vconnected; 533d021c344SAndy King 534d021c344SAndy King vlistener = vsock_sk(listener); 535d021c344SAndy King 536d021c344SAndy King if (list_empty(&vlistener->accept_queue)) 537d021c344SAndy King return NULL; 538d021c344SAndy King 539d021c344SAndy King vconnected = list_entry(vlistener->accept_queue.next, 540d021c344SAndy King struct vsock_sock, accept_queue); 541d021c344SAndy King 542d021c344SAndy King list_del_init(&vconnected->accept_queue); 543d021c344SAndy King sock_put(listener); 544d021c344SAndy King /* The caller will need a reference on the connected socket so we let 545d021c344SAndy King * it call sock_put(). 546d021c344SAndy King */ 547d021c344SAndy King 548d021c344SAndy King return sk_vsock(vconnected); 549d021c344SAndy King } 550d021c344SAndy King 551d021c344SAndy King static bool vsock_is_accept_queue_empty(struct sock *sk) 552d021c344SAndy King { 553d021c344SAndy King struct vsock_sock *vsk = vsock_sk(sk); 554d021c344SAndy King return list_empty(&vsk->accept_queue); 555d021c344SAndy King } 556d021c344SAndy King 557d021c344SAndy King static bool vsock_is_pending(struct sock *sk) 558d021c344SAndy King { 559d021c344SAndy King struct vsock_sock *vsk = vsock_sk(sk); 560d021c344SAndy King return !list_empty(&vsk->pending_links); 561d021c344SAndy King } 562d021c344SAndy King 563d021c344SAndy King static int vsock_send_shutdown(struct sock *sk, int mode) 564d021c344SAndy King { 565fe502c4aSStefano Garzarella struct vsock_sock *vsk = vsock_sk(sk); 566fe502c4aSStefano Garzarella 567c0cfa2d8SStefano Garzarella if (!vsk->transport) 568c0cfa2d8SStefano Garzarella return -ENODEV; 569c0cfa2d8SStefano Garzarella 570fe502c4aSStefano Garzarella return vsk->transport->shutdown(vsk, mode); 571d021c344SAndy King } 572d021c344SAndy King 573455f05ecSCong Wang static void vsock_pending_work(struct work_struct *work) 574d021c344SAndy King { 575d021c344SAndy King struct sock *sk; 576d021c344SAndy King struct sock *listener; 577d021c344SAndy King struct vsock_sock *vsk; 578d021c344SAndy King bool cleanup; 579d021c344SAndy King 580455f05ecSCong Wang vsk = container_of(work, struct vsock_sock, pending_work.work); 581d021c344SAndy King sk = sk_vsock(vsk); 582d021c344SAndy King listener = vsk->listener; 583d021c344SAndy King cleanup = true; 584d021c344SAndy King 585d021c344SAndy King lock_sock(listener); 5864192f672SStefan Hajnoczi lock_sock_nested(sk, SINGLE_DEPTH_NESTING); 587d021c344SAndy King 588d021c344SAndy King if (vsock_is_pending(sk)) { 589d021c344SAndy King vsock_remove_pending(listener, sk); 5901190cfdbSJorgen Hansen 5917976a11bSEric Dumazet sk_acceptq_removed(listener); 592d021c344SAndy King } else if (!vsk->rejected) { 593d021c344SAndy King /* We are not on the pending list and accept() did not reject 594d021c344SAndy King * us, so we must have been accepted by our user process. We 595d021c344SAndy King * just need to drop our references to the sockets and be on 596d021c344SAndy King * our way. 597d021c344SAndy King */ 598d021c344SAndy King cleanup = false; 599d021c344SAndy King goto out; 600d021c344SAndy King } 601d021c344SAndy King 602d021c344SAndy King /* We need to remove ourself from the global connected sockets list so 603d021c344SAndy King * incoming packets can't find this socket, and to reduce the reference 604d021c344SAndy King * count. 605d021c344SAndy King */ 606d021c344SAndy King vsock_remove_connected(vsk); 607d021c344SAndy King 6083b4477d2SStefan Hajnoczi sk->sk_state = TCP_CLOSE; 609d021c344SAndy King 610d021c344SAndy King out: 611d021c344SAndy King release_sock(sk); 612d021c344SAndy King release_sock(listener); 613d021c344SAndy King if (cleanup) 614d021c344SAndy King sock_put(sk); 615d021c344SAndy King 616d021c344SAndy King sock_put(sk); 617d021c344SAndy King sock_put(listener); 618d021c344SAndy King } 619d021c344SAndy King 620d021c344SAndy King /**** SOCKET OPERATIONS ****/ 621d021c344SAndy King 622a9e29e55SArseny Krasnov static int __vsock_bind_connectible(struct vsock_sock *vsk, 623d021c344SAndy King struct sockaddr_vm *addr) 624d021c344SAndy King { 625a22d3251SLepton Wu static u32 port; 626d021c344SAndy King struct sockaddr_vm new_addr; 627d021c344SAndy King 6288236b08cSLepton Wu if (!port) 6298236b08cSLepton Wu port = LAST_RESERVED_PORT + 1 + 6308236b08cSLepton Wu prandom_u32_max(U32_MAX - LAST_RESERVED_PORT); 6318236b08cSLepton Wu 632d021c344SAndy King vsock_addr_init(&new_addr, addr->svm_cid, addr->svm_port); 633d021c344SAndy King 634d021c344SAndy King if (addr->svm_port == VMADDR_PORT_ANY) { 635d021c344SAndy King bool found = false; 636d021c344SAndy King unsigned int i; 637d021c344SAndy King 638d021c344SAndy King for (i = 0; i < MAX_PORT_RETRIES; i++) { 639d021c344SAndy King if (port <= LAST_RESERVED_PORT) 640d021c344SAndy King port = LAST_RESERVED_PORT + 1; 641d021c344SAndy King 642d021c344SAndy King new_addr.svm_port = port++; 643d021c344SAndy King 644d021c344SAndy King if (!__vsock_find_bound_socket(&new_addr)) { 645d021c344SAndy King found = true; 646d021c344SAndy King break; 647d021c344SAndy King } 648d021c344SAndy King } 649d021c344SAndy King 650d021c344SAndy King if (!found) 651d021c344SAndy King return -EADDRNOTAVAIL; 652d021c344SAndy King } else { 653d021c344SAndy King /* If port is in reserved range, ensure caller 654d021c344SAndy King * has necessary privileges. 655d021c344SAndy King */ 656d021c344SAndy King if (addr->svm_port <= LAST_RESERVED_PORT && 657d021c344SAndy King !capable(CAP_NET_BIND_SERVICE)) { 658d021c344SAndy King return -EACCES; 659d021c344SAndy King } 660d021c344SAndy King 661d021c344SAndy King if (__vsock_find_bound_socket(&new_addr)) 662d021c344SAndy King return -EADDRINUSE; 663d021c344SAndy King } 664d021c344SAndy King 665d021c344SAndy King vsock_addr_init(&vsk->local_addr, new_addr.svm_cid, new_addr.svm_port); 666d021c344SAndy King 6678cb48554SArseny Krasnov /* Remove connection oriented sockets from the unbound list and add them 6688cb48554SArseny Krasnov * to the hash table for easy lookup by its address. The unbound list 6698cb48554SArseny Krasnov * is simply an extra entry at the end of the hash table, a trick used 6708cb48554SArseny Krasnov * by AF_UNIX. 671d021c344SAndy King */ 672d021c344SAndy King __vsock_remove_bound(vsk); 673d021c344SAndy King __vsock_insert_bound(vsock_bound_sockets(&vsk->local_addr), vsk); 674d021c344SAndy King 675d021c344SAndy King return 0; 676d021c344SAndy King } 677d021c344SAndy King 678d021c344SAndy King static int __vsock_bind_dgram(struct vsock_sock *vsk, 679d021c344SAndy King struct sockaddr_vm *addr) 680d021c344SAndy King { 681fe502c4aSStefano Garzarella return vsk->transport->dgram_bind(vsk, addr); 682d021c344SAndy King } 683d021c344SAndy King 684d021c344SAndy King static int __vsock_bind(struct sock *sk, struct sockaddr_vm *addr) 685d021c344SAndy King { 686d021c344SAndy King struct vsock_sock *vsk = vsock_sk(sk); 687d021c344SAndy King int retval; 688d021c344SAndy King 689d021c344SAndy King /* First ensure this socket isn't already bound. */ 690d021c344SAndy King if (vsock_addr_bound(&vsk->local_addr)) 691d021c344SAndy King return -EINVAL; 692d021c344SAndy King 693d021c344SAndy King /* Now bind to the provided address or select appropriate values if 694d021c344SAndy King * none are provided (VMADDR_CID_ANY and VMADDR_PORT_ANY). Note that 695d021c344SAndy King * like AF_INET prevents binding to a non-local IP address (in most 696c0cfa2d8SStefano Garzarella * cases), we only allow binding to a local CID. 697d021c344SAndy King */ 698c0cfa2d8SStefano Garzarella if (addr->svm_cid != VMADDR_CID_ANY && !vsock_find_cid(addr->svm_cid)) 699d021c344SAndy King return -EADDRNOTAVAIL; 700d021c344SAndy King 701d021c344SAndy King switch (sk->sk_socket->type) { 702d021c344SAndy King case SOCK_STREAM: 7030798e78bSArseny Krasnov case SOCK_SEQPACKET: 704d021c344SAndy King spin_lock_bh(&vsock_table_lock); 705a9e29e55SArseny Krasnov retval = __vsock_bind_connectible(vsk, addr); 706d021c344SAndy King spin_unlock_bh(&vsock_table_lock); 707d021c344SAndy King break; 708d021c344SAndy King 709d021c344SAndy King case SOCK_DGRAM: 710d021c344SAndy King retval = __vsock_bind_dgram(vsk, addr); 711d021c344SAndy King break; 712d021c344SAndy King 713d021c344SAndy King default: 714d021c344SAndy King retval = -EINVAL; 715d021c344SAndy King break; 716d021c344SAndy King } 717d021c344SAndy King 718d021c344SAndy King return retval; 719d021c344SAndy King } 720d021c344SAndy King 721455f05ecSCong Wang static void vsock_connect_timeout(struct work_struct *work); 722455f05ecSCong Wang 723b9ca2f5fSStefano Garzarella static struct sock *__vsock_create(struct net *net, 724d021c344SAndy King struct socket *sock, 725d021c344SAndy King struct sock *parent, 726d021c344SAndy King gfp_t priority, 72711aa9c28SEric W. Biederman unsigned short type, 72811aa9c28SEric W. Biederman int kern) 729d021c344SAndy King { 730d021c344SAndy King struct sock *sk; 731d021c344SAndy King struct vsock_sock *psk; 732d021c344SAndy King struct vsock_sock *vsk; 733d021c344SAndy King 73411aa9c28SEric W. Biederman sk = sk_alloc(net, AF_VSOCK, priority, &vsock_proto, kern); 735d021c344SAndy King if (!sk) 736d021c344SAndy King return NULL; 737d021c344SAndy King 738d021c344SAndy King sock_init_data(sock, sk); 739d021c344SAndy King 740d021c344SAndy King /* sk->sk_type is normally set in sock_init_data, but only if sock is 741d021c344SAndy King * non-NULL. We make sure that our sockets always have a type by 742d021c344SAndy King * setting it here if needed. 743d021c344SAndy King */ 744d021c344SAndy King if (!sock) 745d021c344SAndy King sk->sk_type = type; 746d021c344SAndy King 747d021c344SAndy King vsk = vsock_sk(sk); 748d021c344SAndy King vsock_addr_init(&vsk->local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); 749d021c344SAndy King vsock_addr_init(&vsk->remote_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); 750d021c344SAndy King 751d021c344SAndy King sk->sk_destruct = vsock_sk_destruct; 752d021c344SAndy King sk->sk_backlog_rcv = vsock_queue_rcv_skb; 753d021c344SAndy King sock_reset_flag(sk, SOCK_DONE); 754d021c344SAndy King 755d021c344SAndy King INIT_LIST_HEAD(&vsk->bound_table); 756d021c344SAndy King INIT_LIST_HEAD(&vsk->connected_table); 757d021c344SAndy King vsk->listener = NULL; 758d021c344SAndy King INIT_LIST_HEAD(&vsk->pending_links); 759d021c344SAndy King INIT_LIST_HEAD(&vsk->accept_queue); 760d021c344SAndy King vsk->rejected = false; 761d021c344SAndy King vsk->sent_request = false; 762d021c344SAndy King vsk->ignore_connecting_rst = false; 763d021c344SAndy King vsk->peer_shutdown = 0; 764455f05ecSCong Wang INIT_DELAYED_WORK(&vsk->connect_work, vsock_connect_timeout); 765455f05ecSCong Wang INIT_DELAYED_WORK(&vsk->pending_work, vsock_pending_work); 766d021c344SAndy King 767d021c344SAndy King psk = parent ? vsock_sk(parent) : NULL; 768d021c344SAndy King if (parent) { 769d021c344SAndy King vsk->trusted = psk->trusted; 770d021c344SAndy King vsk->owner = get_cred(psk->owner); 771d021c344SAndy King vsk->connect_timeout = psk->connect_timeout; 772b9f2b0ffSStefano Garzarella vsk->buffer_size = psk->buffer_size; 773b9f2b0ffSStefano Garzarella vsk->buffer_min_size = psk->buffer_min_size; 774b9f2b0ffSStefano Garzarella vsk->buffer_max_size = psk->buffer_max_size; 7751f935e8eSDavid Brazdil security_sk_clone(parent, sk); 776d021c344SAndy King } else { 777af545bb5SJeff Vander Stoep vsk->trusted = ns_capable_noaudit(&init_user_ns, CAP_NET_ADMIN); 778d021c344SAndy King vsk->owner = get_current_cred(); 779d021c344SAndy King vsk->connect_timeout = VSOCK_DEFAULT_CONNECT_TIMEOUT; 780b9f2b0ffSStefano Garzarella vsk->buffer_size = VSOCK_DEFAULT_BUFFER_SIZE; 781b9f2b0ffSStefano Garzarella vsk->buffer_min_size = VSOCK_DEFAULT_BUFFER_MIN_SIZE; 782b9f2b0ffSStefano Garzarella vsk->buffer_max_size = VSOCK_DEFAULT_BUFFER_MAX_SIZE; 783d021c344SAndy King } 784d021c344SAndy King 785d021c344SAndy King return sk; 786d021c344SAndy King } 787d021c344SAndy King 788a9e29e55SArseny Krasnov static bool sock_type_connectible(u16 type) 789a9e29e55SArseny Krasnov { 7900798e78bSArseny Krasnov return (type == SOCK_STREAM) || (type == SOCK_SEQPACKET); 791a9e29e55SArseny Krasnov } 792a9e29e55SArseny Krasnov 7930d9138ffSDexuan Cui static void __vsock_release(struct sock *sk, int level) 794d021c344SAndy King { 795d021c344SAndy King if (sk) { 796d021c344SAndy King struct sock *pending; 797d021c344SAndy King struct vsock_sock *vsk; 798d021c344SAndy King 799d021c344SAndy King vsk = vsock_sk(sk); 800d021c344SAndy King pending = NULL; /* Compiler warning. */ 801d021c344SAndy King 8020d9138ffSDexuan Cui /* When "level" is SINGLE_DEPTH_NESTING, use the nested 8030d9138ffSDexuan Cui * version to avoid the warning "possible recursive locking 8040d9138ffSDexuan Cui * detected". When "level" is 0, lock_sock_nested(sk, level) 8050d9138ffSDexuan Cui * is the same as lock_sock(sk). 8060d9138ffSDexuan Cui */ 8070d9138ffSDexuan Cui lock_sock_nested(sk, level); 8083f74957fSStefano Garzarella 8093f74957fSStefano Garzarella if (vsk->transport) 8103f74957fSStefano Garzarella vsk->transport->release(vsk); 811a9e29e55SArseny Krasnov else if (sock_type_connectible(sk->sk_type)) 8123f74957fSStefano Garzarella vsock_remove_sock(vsk); 8133f74957fSStefano Garzarella 814d021c344SAndy King sock_orphan(sk); 815d021c344SAndy King sk->sk_shutdown = SHUTDOWN_MASK; 816d021c344SAndy King 8173b7ad08bSChristophe JAILLET skb_queue_purge(&sk->sk_receive_queue); 818d021c344SAndy King 819d021c344SAndy King /* Clean up any sockets that never were accepted. */ 820d021c344SAndy King while ((pending = vsock_dequeue_accept(sk)) != NULL) { 8210d9138ffSDexuan Cui __vsock_release(pending, SINGLE_DEPTH_NESTING); 822d021c344SAndy King sock_put(pending); 823d021c344SAndy King } 824d021c344SAndy King 825d021c344SAndy King release_sock(sk); 826d021c344SAndy King sock_put(sk); 827d021c344SAndy King } 828d021c344SAndy King } 829d021c344SAndy King 830d021c344SAndy King static void vsock_sk_destruct(struct sock *sk) 831d021c344SAndy King { 832d021c344SAndy King struct vsock_sock *vsk = vsock_sk(sk); 833d021c344SAndy King 8346a2c0962SStefano Garzarella vsock_deassign_transport(vsk); 835d021c344SAndy King 836d021c344SAndy King /* When clearing these addresses, there's no need to set the family and 837d021c344SAndy King * possibly register the address family with the kernel. 838d021c344SAndy King */ 839d021c344SAndy King vsock_addr_init(&vsk->local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); 840d021c344SAndy King vsock_addr_init(&vsk->remote_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); 841d021c344SAndy King 842d021c344SAndy King put_cred(vsk->owner); 843d021c344SAndy King } 844d021c344SAndy King 845d021c344SAndy King static int vsock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 846d021c344SAndy King { 847d021c344SAndy King int err; 848d021c344SAndy King 849d021c344SAndy King err = sock_queue_rcv_skb(sk, skb); 850d021c344SAndy King if (err) 851d021c344SAndy King kfree_skb(skb); 852d021c344SAndy King 853d021c344SAndy King return err; 854d021c344SAndy King } 855d021c344SAndy King 856b9ca2f5fSStefano Garzarella struct sock *vsock_create_connected(struct sock *parent) 857b9ca2f5fSStefano Garzarella { 858b9ca2f5fSStefano Garzarella return __vsock_create(sock_net(parent), NULL, parent, GFP_KERNEL, 859b9ca2f5fSStefano Garzarella parent->sk_type, 0); 860b9ca2f5fSStefano Garzarella } 861b9ca2f5fSStefano Garzarella EXPORT_SYMBOL_GPL(vsock_create_connected); 862b9ca2f5fSStefano Garzarella 863d021c344SAndy King s64 vsock_stream_has_data(struct vsock_sock *vsk) 864d021c344SAndy King { 865fe502c4aSStefano Garzarella return vsk->transport->stream_has_data(vsk); 866d021c344SAndy King } 867d021c344SAndy King EXPORT_SYMBOL_GPL(vsock_stream_has_data); 868d021c344SAndy King 869cc97141aSStefano Garzarella static s64 vsock_connectible_has_data(struct vsock_sock *vsk) 8700798e78bSArseny Krasnov { 8710798e78bSArseny Krasnov struct sock *sk = sk_vsock(vsk); 8720798e78bSArseny Krasnov 8730798e78bSArseny Krasnov if (sk->sk_type == SOCK_SEQPACKET) 8740798e78bSArseny Krasnov return vsk->transport->seqpacket_has_data(vsk); 8750798e78bSArseny Krasnov else 8760798e78bSArseny Krasnov return vsock_stream_has_data(vsk); 8770798e78bSArseny Krasnov } 8780798e78bSArseny Krasnov 879d021c344SAndy King s64 vsock_stream_has_space(struct vsock_sock *vsk) 880d021c344SAndy King { 881fe502c4aSStefano Garzarella return vsk->transport->stream_has_space(vsk); 882d021c344SAndy King } 883d021c344SAndy King EXPORT_SYMBOL_GPL(vsock_stream_has_space); 884d021c344SAndy King 885d021c344SAndy King static int vsock_release(struct socket *sock) 886d021c344SAndy King { 8870d9138ffSDexuan Cui __vsock_release(sock->sk, 0); 888d021c344SAndy King sock->sk = NULL; 889d021c344SAndy King sock->state = SS_FREE; 890d021c344SAndy King 891d021c344SAndy King return 0; 892d021c344SAndy King } 893d021c344SAndy King 894d021c344SAndy King static int 895d021c344SAndy King vsock_bind(struct socket *sock, struct sockaddr *addr, int addr_len) 896d021c344SAndy King { 897d021c344SAndy King int err; 898d021c344SAndy King struct sock *sk; 899d021c344SAndy King struct sockaddr_vm *vm_addr; 900d021c344SAndy King 901d021c344SAndy King sk = sock->sk; 902d021c344SAndy King 903d021c344SAndy King if (vsock_addr_cast(addr, addr_len, &vm_addr) != 0) 904d021c344SAndy King return -EINVAL; 905d021c344SAndy King 906d021c344SAndy King lock_sock(sk); 907d021c344SAndy King err = __vsock_bind(sk, vm_addr); 908d021c344SAndy King release_sock(sk); 909d021c344SAndy King 910d021c344SAndy King return err; 911d021c344SAndy King } 912d021c344SAndy King 913d021c344SAndy King static int vsock_getname(struct socket *sock, 9149b2c45d4SDenys Vlasenko struct sockaddr *addr, int peer) 915d021c344SAndy King { 916d021c344SAndy King int err; 917d021c344SAndy King struct sock *sk; 918d021c344SAndy King struct vsock_sock *vsk; 919d021c344SAndy King struct sockaddr_vm *vm_addr; 920d021c344SAndy King 921d021c344SAndy King sk = sock->sk; 922d021c344SAndy King vsk = vsock_sk(sk); 923d021c344SAndy King err = 0; 924d021c344SAndy King 925d021c344SAndy King lock_sock(sk); 926d021c344SAndy King 927d021c344SAndy King if (peer) { 928d021c344SAndy King if (sock->state != SS_CONNECTED) { 929d021c344SAndy King err = -ENOTCONN; 930d021c344SAndy King goto out; 931d021c344SAndy King } 932d021c344SAndy King vm_addr = &vsk->remote_addr; 933d021c344SAndy King } else { 934d021c344SAndy King vm_addr = &vsk->local_addr; 935d021c344SAndy King } 936d021c344SAndy King 937d021c344SAndy King if (!vm_addr) { 938d021c344SAndy King err = -EINVAL; 939d021c344SAndy King goto out; 940d021c344SAndy King } 941d021c344SAndy King 942d021c344SAndy King /* sys_getsockname() and sys_getpeername() pass us a 943d021c344SAndy King * MAX_SOCK_ADDR-sized buffer and don't set addr_len. Unfortunately 944d021c344SAndy King * that macro is defined in socket.c instead of .h, so we hardcode its 945d021c344SAndy King * value here. 946d021c344SAndy King */ 947d021c344SAndy King BUILD_BUG_ON(sizeof(*vm_addr) > 128); 948d021c344SAndy King memcpy(addr, vm_addr, sizeof(*vm_addr)); 9499b2c45d4SDenys Vlasenko err = sizeof(*vm_addr); 950d021c344SAndy King 951d021c344SAndy King out: 952d021c344SAndy King release_sock(sk); 953d021c344SAndy King return err; 954d021c344SAndy King } 955d021c344SAndy King 956d021c344SAndy King static int vsock_shutdown(struct socket *sock, int mode) 957d021c344SAndy King { 958d021c344SAndy King int err; 959d021c344SAndy King struct sock *sk; 960d021c344SAndy King 961d021c344SAndy King /* User level uses SHUT_RD (0) and SHUT_WR (1), but the kernel uses 962d021c344SAndy King * RCV_SHUTDOWN (1) and SEND_SHUTDOWN (2), so we must increment mode 963d021c344SAndy King * here like the other address families do. Note also that the 964d021c344SAndy King * increment makes SHUT_RDWR (2) into RCV_SHUTDOWN | SEND_SHUTDOWN (3), 965d021c344SAndy King * which is what we want. 966d021c344SAndy King */ 967d021c344SAndy King mode++; 968d021c344SAndy King 969d021c344SAndy King if ((mode & ~SHUTDOWN_MASK) || !mode) 970d021c344SAndy King return -EINVAL; 971d021c344SAndy King 9728cb48554SArseny Krasnov /* If this is a connection oriented socket and it is not connected then 9738cb48554SArseny Krasnov * bail out immediately. If it is a DGRAM socket then we must first 9748cb48554SArseny Krasnov * kick the socket so that it wakes up from any sleeping calls, for 9758cb48554SArseny Krasnov * example recv(), and then afterwards return the error. 976d021c344SAndy King */ 977d021c344SAndy King 978d021c344SAndy King sk = sock->sk; 9791c5fae9cSStefano Garzarella 9801c5fae9cSStefano Garzarella lock_sock(sk); 981d021c344SAndy King if (sock->state == SS_UNCONNECTED) { 982d021c344SAndy King err = -ENOTCONN; 983a9e29e55SArseny Krasnov if (sock_type_connectible(sk->sk_type)) 9841c5fae9cSStefano Garzarella goto out; 985d021c344SAndy King } else { 986d021c344SAndy King sock->state = SS_DISCONNECTING; 987d021c344SAndy King err = 0; 988d021c344SAndy King } 989d021c344SAndy King 990d021c344SAndy King /* Receive and send shutdowns are treated alike. */ 991d021c344SAndy King mode = mode & (RCV_SHUTDOWN | SEND_SHUTDOWN); 992d021c344SAndy King if (mode) { 993d021c344SAndy King sk->sk_shutdown |= mode; 994d021c344SAndy King sk->sk_state_change(sk); 995d021c344SAndy King 996a9e29e55SArseny Krasnov if (sock_type_connectible(sk->sk_type)) { 997d021c344SAndy King sock_reset_flag(sk, SOCK_DONE); 998d021c344SAndy King vsock_send_shutdown(sk, mode); 999d021c344SAndy King } 1000d021c344SAndy King } 1001d021c344SAndy King 10021c5fae9cSStefano Garzarella out: 10031c5fae9cSStefano Garzarella release_sock(sk); 1004d021c344SAndy King return err; 1005d021c344SAndy King } 1006d021c344SAndy King 1007a11e1d43SLinus Torvalds static __poll_t vsock_poll(struct file *file, struct socket *sock, 1008a11e1d43SLinus Torvalds poll_table *wait) 1009d021c344SAndy King { 1010a11e1d43SLinus Torvalds struct sock *sk; 1011a11e1d43SLinus Torvalds __poll_t mask; 1012a11e1d43SLinus Torvalds struct vsock_sock *vsk; 1013a11e1d43SLinus Torvalds 1014a11e1d43SLinus Torvalds sk = sock->sk; 1015a11e1d43SLinus Torvalds vsk = vsock_sk(sk); 1016a11e1d43SLinus Torvalds 1017a11e1d43SLinus Torvalds poll_wait(file, sk_sleep(sk), wait); 1018a11e1d43SLinus Torvalds mask = 0; 1019d021c344SAndy King 1020d021c344SAndy King if (sk->sk_err) 1021d021c344SAndy King /* Signify that there has been an error on this socket. */ 1022a9a08845SLinus Torvalds mask |= EPOLLERR; 1023d021c344SAndy King 1024d021c344SAndy King /* INET sockets treat local write shutdown and peer write shutdown as a 1025a9a08845SLinus Torvalds * case of EPOLLHUP set. 1026d021c344SAndy King */ 1027d021c344SAndy King if ((sk->sk_shutdown == SHUTDOWN_MASK) || 1028d021c344SAndy King ((sk->sk_shutdown & SEND_SHUTDOWN) && 1029d021c344SAndy King (vsk->peer_shutdown & SEND_SHUTDOWN))) { 1030a9a08845SLinus Torvalds mask |= EPOLLHUP; 1031d021c344SAndy King } 1032d021c344SAndy King 1033d021c344SAndy King if (sk->sk_shutdown & RCV_SHUTDOWN || 1034d021c344SAndy King vsk->peer_shutdown & SEND_SHUTDOWN) { 1035a9a08845SLinus Torvalds mask |= EPOLLRDHUP; 1036d021c344SAndy King } 1037d021c344SAndy King 1038d021c344SAndy King if (sock->type == SOCK_DGRAM) { 1039d021c344SAndy King /* For datagram sockets we can read if there is something in 1040d021c344SAndy King * the queue and write as long as the socket isn't shutdown for 1041d021c344SAndy King * sending. 1042d021c344SAndy King */ 10433ef7cf57SEric Dumazet if (!skb_queue_empty_lockless(&sk->sk_receive_queue) || 1044d021c344SAndy King (sk->sk_shutdown & RCV_SHUTDOWN)) { 1045a9a08845SLinus Torvalds mask |= EPOLLIN | EPOLLRDNORM; 1046d021c344SAndy King } 1047d021c344SAndy King 1048d021c344SAndy King if (!(sk->sk_shutdown & SEND_SHUTDOWN)) 1049a9a08845SLinus Torvalds mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND; 1050d021c344SAndy King 1051a9e29e55SArseny Krasnov } else if (sock_type_connectible(sk->sk_type)) { 1052c518adafSAlexander Popov const struct vsock_transport *transport; 1053c518adafSAlexander Popov 1054d021c344SAndy King lock_sock(sk); 1055d021c344SAndy King 1056c518adafSAlexander Popov transport = vsk->transport; 1057c518adafSAlexander Popov 1058d021c344SAndy King /* Listening sockets that have connections in their accept 1059d021c344SAndy King * queue can be read. 1060d021c344SAndy King */ 10613b4477d2SStefan Hajnoczi if (sk->sk_state == TCP_LISTEN 1062d021c344SAndy King && !vsock_is_accept_queue_empty(sk)) 1063a9a08845SLinus Torvalds mask |= EPOLLIN | EPOLLRDNORM; 1064d021c344SAndy King 1065d021c344SAndy King /* If there is something in the queue then we can read. */ 1066c0cfa2d8SStefano Garzarella if (transport && transport->stream_is_active(vsk) && 1067d021c344SAndy King !(sk->sk_shutdown & RCV_SHUTDOWN)) { 1068d021c344SAndy King bool data_ready_now = false; 1069*ee0b3843SArseniy Krasnov int target = sock_rcvlowat(sk, 0, INT_MAX); 1070d021c344SAndy King int ret = transport->notify_poll_in( 1071*ee0b3843SArseniy Krasnov vsk, target, &data_ready_now); 1072d021c344SAndy King if (ret < 0) { 1073a9a08845SLinus Torvalds mask |= EPOLLERR; 1074d021c344SAndy King } else { 1075d021c344SAndy King if (data_ready_now) 1076a9a08845SLinus Torvalds mask |= EPOLLIN | EPOLLRDNORM; 1077d021c344SAndy King 1078d021c344SAndy King } 1079d021c344SAndy King } 1080d021c344SAndy King 1081d021c344SAndy King /* Sockets whose connections have been closed, reset, or 1082d021c344SAndy King * terminated should also be considered read, and we check the 1083d021c344SAndy King * shutdown flag for that. 1084d021c344SAndy King */ 1085d021c344SAndy King if (sk->sk_shutdown & RCV_SHUTDOWN || 1086d021c344SAndy King vsk->peer_shutdown & SEND_SHUTDOWN) { 1087a9a08845SLinus Torvalds mask |= EPOLLIN | EPOLLRDNORM; 1088d021c344SAndy King } 1089d021c344SAndy King 1090d021c344SAndy King /* Connected sockets that can produce data can be written. */ 10911980c058SStefano Garzarella if (transport && sk->sk_state == TCP_ESTABLISHED) { 1092d021c344SAndy King if (!(sk->sk_shutdown & SEND_SHUTDOWN)) { 1093d021c344SAndy King bool space_avail_now = false; 1094d021c344SAndy King int ret = transport->notify_poll_out( 1095d021c344SAndy King vsk, 1, &space_avail_now); 1096d021c344SAndy King if (ret < 0) { 1097a9a08845SLinus Torvalds mask |= EPOLLERR; 1098d021c344SAndy King } else { 1099d021c344SAndy King if (space_avail_now) 1100a9a08845SLinus Torvalds /* Remove EPOLLWRBAND since INET 1101d021c344SAndy King * sockets are not setting it. 1102d021c344SAndy King */ 1103a9a08845SLinus Torvalds mask |= EPOLLOUT | EPOLLWRNORM; 1104d021c344SAndy King 1105d021c344SAndy King } 1106d021c344SAndy King } 1107d021c344SAndy King } 1108d021c344SAndy King 1109d021c344SAndy King /* Simulate INET socket poll behaviors, which sets 1110a9a08845SLinus Torvalds * EPOLLOUT|EPOLLWRNORM when peer is closed and nothing to read, 1111d021c344SAndy King * but local send is not shutdown. 1112d021c344SAndy King */ 1113ba3169fcSStefan Hajnoczi if (sk->sk_state == TCP_CLOSE || sk->sk_state == TCP_CLOSING) { 1114d021c344SAndy King if (!(sk->sk_shutdown & SEND_SHUTDOWN)) 1115a9a08845SLinus Torvalds mask |= EPOLLOUT | EPOLLWRNORM; 1116d021c344SAndy King 1117d021c344SAndy King } 1118d021c344SAndy King 1119d021c344SAndy King release_sock(sk); 1120d021c344SAndy King } 1121d021c344SAndy King 1122d021c344SAndy King return mask; 1123d021c344SAndy King } 1124d021c344SAndy King 11251b784140SYing Xue static int vsock_dgram_sendmsg(struct socket *sock, struct msghdr *msg, 11261b784140SYing Xue size_t len) 1127d021c344SAndy King { 1128d021c344SAndy King int err; 1129d021c344SAndy King struct sock *sk; 1130d021c344SAndy King struct vsock_sock *vsk; 1131d021c344SAndy King struct sockaddr_vm *remote_addr; 1132fe502c4aSStefano Garzarella const struct vsock_transport *transport; 1133d021c344SAndy King 1134d021c344SAndy King if (msg->msg_flags & MSG_OOB) 1135d021c344SAndy King return -EOPNOTSUPP; 1136d021c344SAndy King 1137d021c344SAndy King /* For now, MSG_DONTWAIT is always assumed... */ 1138d021c344SAndy King err = 0; 1139d021c344SAndy King sk = sock->sk; 1140d021c344SAndy King vsk = vsock_sk(sk); 1141d021c344SAndy King 1142d021c344SAndy King lock_sock(sk); 1143d021c344SAndy King 1144c518adafSAlexander Popov transport = vsk->transport; 1145c518adafSAlexander Popov 1146b3a6dfe8SAsias He err = vsock_auto_bind(vsk); 1147b3a6dfe8SAsias He if (err) 1148d021c344SAndy King goto out; 1149d021c344SAndy King 1150d021c344SAndy King 1151d021c344SAndy King /* If the provided message contains an address, use that. Otherwise 1152d021c344SAndy King * fall back on the socket's remote handle (if it has been connected). 1153d021c344SAndy King */ 1154d021c344SAndy King if (msg->msg_name && 1155d021c344SAndy King vsock_addr_cast(msg->msg_name, msg->msg_namelen, 1156d021c344SAndy King &remote_addr) == 0) { 1157d021c344SAndy King /* Ensure this address is of the right type and is a valid 1158d021c344SAndy King * destination. 1159d021c344SAndy King */ 1160d021c344SAndy King 1161d021c344SAndy King if (remote_addr->svm_cid == VMADDR_CID_ANY) 1162d021c344SAndy King remote_addr->svm_cid = transport->get_local_cid(); 1163d021c344SAndy King 1164d021c344SAndy King if (!vsock_addr_bound(remote_addr)) { 1165d021c344SAndy King err = -EINVAL; 1166d021c344SAndy King goto out; 1167d021c344SAndy King } 1168d021c344SAndy King } else if (sock->state == SS_CONNECTED) { 1169d021c344SAndy King remote_addr = &vsk->remote_addr; 1170d021c344SAndy King 1171d021c344SAndy King if (remote_addr->svm_cid == VMADDR_CID_ANY) 1172d021c344SAndy King remote_addr->svm_cid = transport->get_local_cid(); 1173d021c344SAndy King 1174d021c344SAndy King /* XXX Should connect() or this function ensure remote_addr is 1175d021c344SAndy King * bound? 1176d021c344SAndy King */ 1177d021c344SAndy King if (!vsock_addr_bound(&vsk->remote_addr)) { 1178d021c344SAndy King err = -EINVAL; 1179d021c344SAndy King goto out; 1180d021c344SAndy King } 1181d021c344SAndy King } else { 1182d021c344SAndy King err = -EINVAL; 1183d021c344SAndy King goto out; 1184d021c344SAndy King } 1185d021c344SAndy King 1186d021c344SAndy King if (!transport->dgram_allow(remote_addr->svm_cid, 1187d021c344SAndy King remote_addr->svm_port)) { 1188d021c344SAndy King err = -EINVAL; 1189d021c344SAndy King goto out; 1190d021c344SAndy King } 1191d021c344SAndy King 11920f7db23aSAl Viro err = transport->dgram_enqueue(vsk, remote_addr, msg, len); 1193d021c344SAndy King 1194d021c344SAndy King out: 1195d021c344SAndy King release_sock(sk); 1196d021c344SAndy King return err; 1197d021c344SAndy King } 1198d021c344SAndy King 1199d021c344SAndy King static int vsock_dgram_connect(struct socket *sock, 1200d021c344SAndy King struct sockaddr *addr, int addr_len, int flags) 1201d021c344SAndy King { 1202d021c344SAndy King int err; 1203d021c344SAndy King struct sock *sk; 1204d021c344SAndy King struct vsock_sock *vsk; 1205d021c344SAndy King struct sockaddr_vm *remote_addr; 1206d021c344SAndy King 1207d021c344SAndy King sk = sock->sk; 1208d021c344SAndy King vsk = vsock_sk(sk); 1209d021c344SAndy King 1210d021c344SAndy King err = vsock_addr_cast(addr, addr_len, &remote_addr); 1211d021c344SAndy King if (err == -EAFNOSUPPORT && remote_addr->svm_family == AF_UNSPEC) { 1212d021c344SAndy King lock_sock(sk); 1213d021c344SAndy King vsock_addr_init(&vsk->remote_addr, VMADDR_CID_ANY, 1214d021c344SAndy King VMADDR_PORT_ANY); 1215d021c344SAndy King sock->state = SS_UNCONNECTED; 1216d021c344SAndy King release_sock(sk); 1217d021c344SAndy King return 0; 1218d021c344SAndy King } else if (err != 0) 1219d021c344SAndy King return -EINVAL; 1220d021c344SAndy King 1221d021c344SAndy King lock_sock(sk); 1222d021c344SAndy King 1223b3a6dfe8SAsias He err = vsock_auto_bind(vsk); 1224b3a6dfe8SAsias He if (err) 1225d021c344SAndy King goto out; 1226d021c344SAndy King 1227fe502c4aSStefano Garzarella if (!vsk->transport->dgram_allow(remote_addr->svm_cid, 1228d021c344SAndy King remote_addr->svm_port)) { 1229d021c344SAndy King err = -EINVAL; 1230d021c344SAndy King goto out; 1231d021c344SAndy King } 1232d021c344SAndy King 1233d021c344SAndy King memcpy(&vsk->remote_addr, remote_addr, sizeof(vsk->remote_addr)); 1234d021c344SAndy King sock->state = SS_CONNECTED; 1235d021c344SAndy King 1236d021c344SAndy King out: 1237d021c344SAndy King release_sock(sk); 1238d021c344SAndy King return err; 1239d021c344SAndy King } 1240d021c344SAndy King 12411b784140SYing Xue static int vsock_dgram_recvmsg(struct socket *sock, struct msghdr *msg, 12421b784140SYing Xue size_t len, int flags) 1243d021c344SAndy King { 1244fe502c4aSStefano Garzarella struct vsock_sock *vsk = vsock_sk(sock->sk); 1245fe502c4aSStefano Garzarella 1246fe502c4aSStefano Garzarella return vsk->transport->dgram_dequeue(vsk, msg, len, flags); 1247d021c344SAndy King } 1248d021c344SAndy King 1249d021c344SAndy King static const struct proto_ops vsock_dgram_ops = { 1250d021c344SAndy King .family = PF_VSOCK, 1251d021c344SAndy King .owner = THIS_MODULE, 1252d021c344SAndy King .release = vsock_release, 1253d021c344SAndy King .bind = vsock_bind, 1254d021c344SAndy King .connect = vsock_dgram_connect, 1255d021c344SAndy King .socketpair = sock_no_socketpair, 1256d021c344SAndy King .accept = sock_no_accept, 1257d021c344SAndy King .getname = vsock_getname, 1258a11e1d43SLinus Torvalds .poll = vsock_poll, 1259d021c344SAndy King .ioctl = sock_no_ioctl, 1260d021c344SAndy King .listen = sock_no_listen, 1261d021c344SAndy King .shutdown = vsock_shutdown, 1262d021c344SAndy King .sendmsg = vsock_dgram_sendmsg, 1263d021c344SAndy King .recvmsg = vsock_dgram_recvmsg, 1264d021c344SAndy King .mmap = sock_no_mmap, 1265d021c344SAndy King .sendpage = sock_no_sendpage, 1266d021c344SAndy King }; 1267d021c344SAndy King 1268380feae0SPeng Tao static int vsock_transport_cancel_pkt(struct vsock_sock *vsk) 1269380feae0SPeng Tao { 1270fe502c4aSStefano Garzarella const struct vsock_transport *transport = vsk->transport; 1271fe502c4aSStefano Garzarella 12725d1cbcc9SNorbert Slusarek if (!transport || !transport->cancel_pkt) 1273380feae0SPeng Tao return -EOPNOTSUPP; 1274380feae0SPeng Tao 1275380feae0SPeng Tao return transport->cancel_pkt(vsk); 1276380feae0SPeng Tao } 1277380feae0SPeng Tao 1278d021c344SAndy King static void vsock_connect_timeout(struct work_struct *work) 1279d021c344SAndy King { 1280d021c344SAndy King struct sock *sk; 1281d021c344SAndy King struct vsock_sock *vsk; 1282d021c344SAndy King 1283455f05ecSCong Wang vsk = container_of(work, struct vsock_sock, connect_work.work); 1284d021c344SAndy King sk = sk_vsock(vsk); 1285d021c344SAndy King 1286d021c344SAndy King lock_sock(sk); 12873b4477d2SStefan Hajnoczi if (sk->sk_state == TCP_SYN_SENT && 1288d021c344SAndy King (sk->sk_shutdown != SHUTDOWN_MASK)) { 12893b4477d2SStefan Hajnoczi sk->sk_state = TCP_CLOSE; 1290a3e7b29eSPeilin Ye sk->sk_socket->state = SS_UNCONNECTED; 1291d021c344SAndy King sk->sk_err = ETIMEDOUT; 1292e3ae2365SAlexander Aring sk_error_report(sk); 12933d0bc44dSNorbert Slusarek vsock_transport_cancel_pkt(vsk); 1294d021c344SAndy King } 1295d021c344SAndy King release_sock(sk); 1296d021c344SAndy King 1297d021c344SAndy King sock_put(sk); 1298d021c344SAndy King } 1299d021c344SAndy King 1300a9e29e55SArseny Krasnov static int vsock_connect(struct socket *sock, struct sockaddr *addr, 1301d021c344SAndy King int addr_len, int flags) 1302d021c344SAndy King { 1303d021c344SAndy King int err; 1304d021c344SAndy King struct sock *sk; 1305d021c344SAndy King struct vsock_sock *vsk; 1306fe502c4aSStefano Garzarella const struct vsock_transport *transport; 1307d021c344SAndy King struct sockaddr_vm *remote_addr; 1308d021c344SAndy King long timeout; 1309d021c344SAndy King DEFINE_WAIT(wait); 1310d021c344SAndy King 1311d021c344SAndy King err = 0; 1312d021c344SAndy King sk = sock->sk; 1313d021c344SAndy King vsk = vsock_sk(sk); 1314d021c344SAndy King 1315d021c344SAndy King lock_sock(sk); 1316d021c344SAndy King 1317d021c344SAndy King /* XXX AF_UNSPEC should make us disconnect like AF_INET. */ 1318d021c344SAndy King switch (sock->state) { 1319d021c344SAndy King case SS_CONNECTED: 1320d021c344SAndy King err = -EISCONN; 1321d021c344SAndy King goto out; 1322d021c344SAndy King case SS_DISCONNECTING: 1323d021c344SAndy King err = -EINVAL; 1324d021c344SAndy King goto out; 1325d021c344SAndy King case SS_CONNECTING: 1326d021c344SAndy King /* This continues on so we can move sock into the SS_CONNECTED 1327d021c344SAndy King * state once the connection has completed (at which point err 1328d021c344SAndy King * will be set to zero also). Otherwise, we will either wait 1329d021c344SAndy King * for the connection or return -EALREADY should this be a 1330d021c344SAndy King * non-blocking call. 1331d021c344SAndy King */ 1332d021c344SAndy King err = -EALREADY; 1333c7cd82b9SEiichi Tsukata if (flags & O_NONBLOCK) 1334c7cd82b9SEiichi Tsukata goto out; 1335d021c344SAndy King break; 1336d021c344SAndy King default: 13373b4477d2SStefan Hajnoczi if ((sk->sk_state == TCP_LISTEN) || 1338d021c344SAndy King vsock_addr_cast(addr, addr_len, &remote_addr) != 0) { 1339d021c344SAndy King err = -EINVAL; 1340d021c344SAndy King goto out; 1341d021c344SAndy King } 1342d021c344SAndy King 1343c0cfa2d8SStefano Garzarella /* Set the remote address that we are connecting to. */ 1344c0cfa2d8SStefano Garzarella memcpy(&vsk->remote_addr, remote_addr, 1345c0cfa2d8SStefano Garzarella sizeof(vsk->remote_addr)); 1346c0cfa2d8SStefano Garzarella 1347c0cfa2d8SStefano Garzarella err = vsock_assign_transport(vsk, NULL); 1348c0cfa2d8SStefano Garzarella if (err) 1349c0cfa2d8SStefano Garzarella goto out; 1350c0cfa2d8SStefano Garzarella 1351c0cfa2d8SStefano Garzarella transport = vsk->transport; 1352c0cfa2d8SStefano Garzarella 1353d021c344SAndy King /* The hypervisor and well-known contexts do not have socket 1354d021c344SAndy King * endpoints. 1355d021c344SAndy King */ 1356c0cfa2d8SStefano Garzarella if (!transport || 1357c0cfa2d8SStefano Garzarella !transport->stream_allow(remote_addr->svm_cid, 1358d021c344SAndy King remote_addr->svm_port)) { 1359d021c344SAndy King err = -ENETUNREACH; 1360d021c344SAndy King goto out; 1361d021c344SAndy King } 1362d021c344SAndy King 1363b3a6dfe8SAsias He err = vsock_auto_bind(vsk); 1364b3a6dfe8SAsias He if (err) 1365d021c344SAndy King goto out; 1366d021c344SAndy King 13673b4477d2SStefan Hajnoczi sk->sk_state = TCP_SYN_SENT; 1368d021c344SAndy King 1369d021c344SAndy King err = transport->connect(vsk); 1370d021c344SAndy King if (err < 0) 1371d021c344SAndy King goto out; 1372d021c344SAndy King 1373d021c344SAndy King /* Mark sock as connecting and set the error code to in 1374d021c344SAndy King * progress in case this is a non-blocking connect. 1375d021c344SAndy King */ 1376d021c344SAndy King sock->state = SS_CONNECTING; 1377d021c344SAndy King err = -EINPROGRESS; 1378d021c344SAndy King } 1379d021c344SAndy King 1380d021c344SAndy King /* The receive path will handle all communication until we are able to 1381d021c344SAndy King * enter the connected state. Here we wait for the connection to be 1382d021c344SAndy King * completed or a notification of an error. 1383d021c344SAndy King */ 1384d021c344SAndy King timeout = vsk->connect_timeout; 1385d021c344SAndy King prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 1386d021c344SAndy King 13873b4477d2SStefan Hajnoczi while (sk->sk_state != TCP_ESTABLISHED && sk->sk_err == 0) { 1388d021c344SAndy King if (flags & O_NONBLOCK) { 1389d021c344SAndy King /* If we're not going to block, we schedule a timeout 1390d021c344SAndy King * function to generate a timeout on the connection 1391d021c344SAndy King * attempt, in case the peer doesn't respond in a 1392d021c344SAndy King * timely manner. We hold on to the socket until the 1393d021c344SAndy King * timeout fires. 1394d021c344SAndy King */ 1395d021c344SAndy King sock_hold(sk); 13967e97cfedSPeilin Ye 13977e97cfedSPeilin Ye /* If the timeout function is already scheduled, 13987e97cfedSPeilin Ye * reschedule it, then ungrab the socket refcount to 13997e97cfedSPeilin Ye * keep it balanced. 14007e97cfedSPeilin Ye */ 14017e97cfedSPeilin Ye if (mod_delayed_work(system_wq, &vsk->connect_work, 14027e97cfedSPeilin Ye timeout)) 14037e97cfedSPeilin Ye sock_put(sk); 1404d021c344SAndy King 1405d021c344SAndy King /* Skip ahead to preserve error code set above. */ 1406d021c344SAndy King goto out_wait; 1407d021c344SAndy King } 1408d021c344SAndy King 1409d021c344SAndy King release_sock(sk); 1410d021c344SAndy King timeout = schedule_timeout(timeout); 1411d021c344SAndy King lock_sock(sk); 1412d021c344SAndy King 1413d021c344SAndy King if (signal_pending(current)) { 1414d021c344SAndy King err = sock_intr_errno(timeout); 1415c7ff9cffSLongpeng(Mike) sk->sk_state = sk->sk_state == TCP_ESTABLISHED ? TCP_CLOSING : TCP_CLOSE; 1416f7f9b5e7SClaudio Imbrenda sock->state = SS_UNCONNECTED; 1417380feae0SPeng Tao vsock_transport_cancel_pkt(vsk); 1418b9208492SSeth Forshee vsock_remove_connected(vsk); 1419f7f9b5e7SClaudio Imbrenda goto out_wait; 1420d021c344SAndy King } else if (timeout == 0) { 1421d021c344SAndy King err = -ETIMEDOUT; 14223b4477d2SStefan Hajnoczi sk->sk_state = TCP_CLOSE; 1423f7f9b5e7SClaudio Imbrenda sock->state = SS_UNCONNECTED; 1424380feae0SPeng Tao vsock_transport_cancel_pkt(vsk); 1425f7f9b5e7SClaudio Imbrenda goto out_wait; 1426d021c344SAndy King } 1427d021c344SAndy King 1428d021c344SAndy King prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 1429d021c344SAndy King } 1430d021c344SAndy King 1431d021c344SAndy King if (sk->sk_err) { 1432d021c344SAndy King err = -sk->sk_err; 14333b4477d2SStefan Hajnoczi sk->sk_state = TCP_CLOSE; 1434f7f9b5e7SClaudio Imbrenda sock->state = SS_UNCONNECTED; 1435f7f9b5e7SClaudio Imbrenda } else { 1436d021c344SAndy King err = 0; 1437f7f9b5e7SClaudio Imbrenda } 1438d021c344SAndy King 1439d021c344SAndy King out_wait: 1440d021c344SAndy King finish_wait(sk_sleep(sk), &wait); 1441d021c344SAndy King out: 1442d021c344SAndy King release_sock(sk); 1443d021c344SAndy King return err; 1444d021c344SAndy King } 1445d021c344SAndy King 1446cdfbabfbSDavid Howells static int vsock_accept(struct socket *sock, struct socket *newsock, int flags, 1447cdfbabfbSDavid Howells bool kern) 1448d021c344SAndy King { 1449d021c344SAndy King struct sock *listener; 1450d021c344SAndy King int err; 1451d021c344SAndy King struct sock *connected; 1452d021c344SAndy King struct vsock_sock *vconnected; 1453d021c344SAndy King long timeout; 1454d021c344SAndy King DEFINE_WAIT(wait); 1455d021c344SAndy King 1456d021c344SAndy King err = 0; 1457d021c344SAndy King listener = sock->sk; 1458d021c344SAndy King 1459d021c344SAndy King lock_sock(listener); 1460d021c344SAndy King 1461a9e29e55SArseny Krasnov if (!sock_type_connectible(sock->type)) { 1462d021c344SAndy King err = -EOPNOTSUPP; 1463d021c344SAndy King goto out; 1464d021c344SAndy King } 1465d021c344SAndy King 14663b4477d2SStefan Hajnoczi if (listener->sk_state != TCP_LISTEN) { 1467d021c344SAndy King err = -EINVAL; 1468d021c344SAndy King goto out; 1469d021c344SAndy King } 1470d021c344SAndy King 1471d021c344SAndy King /* Wait for children sockets to appear; these are the new sockets 1472d021c344SAndy King * created upon connection establishment. 1473d021c344SAndy King */ 14747e0afbdfSStefano Garzarella timeout = sock_rcvtimeo(listener, flags & O_NONBLOCK); 1475d021c344SAndy King prepare_to_wait(sk_sleep(listener), &wait, TASK_INTERRUPTIBLE); 1476d021c344SAndy King 1477d021c344SAndy King while ((connected = vsock_dequeue_accept(listener)) == NULL && 1478d021c344SAndy King listener->sk_err == 0) { 1479d021c344SAndy King release_sock(listener); 1480d021c344SAndy King timeout = schedule_timeout(timeout); 1481f7f9b5e7SClaudio Imbrenda finish_wait(sk_sleep(listener), &wait); 1482d021c344SAndy King lock_sock(listener); 1483d021c344SAndy King 1484d021c344SAndy King if (signal_pending(current)) { 1485d021c344SAndy King err = sock_intr_errno(timeout); 1486f7f9b5e7SClaudio Imbrenda goto out; 1487d021c344SAndy King } else if (timeout == 0) { 1488d021c344SAndy King err = -EAGAIN; 1489f7f9b5e7SClaudio Imbrenda goto out; 1490d021c344SAndy King } 1491d021c344SAndy King 1492d021c344SAndy King prepare_to_wait(sk_sleep(listener), &wait, TASK_INTERRUPTIBLE); 1493d021c344SAndy King } 1494f7f9b5e7SClaudio Imbrenda finish_wait(sk_sleep(listener), &wait); 1495d021c344SAndy King 1496d021c344SAndy King if (listener->sk_err) 1497d021c344SAndy King err = -listener->sk_err; 1498d021c344SAndy King 1499d021c344SAndy King if (connected) { 15007976a11bSEric Dumazet sk_acceptq_removed(listener); 1501d021c344SAndy King 15024192f672SStefan Hajnoczi lock_sock_nested(connected, SINGLE_DEPTH_NESTING); 1503d021c344SAndy King vconnected = vsock_sk(connected); 1504d021c344SAndy King 1505d021c344SAndy King /* If the listener socket has received an error, then we should 1506d021c344SAndy King * reject this socket and return. Note that we simply mark the 1507d021c344SAndy King * socket rejected, drop our reference, and let the cleanup 1508d021c344SAndy King * function handle the cleanup; the fact that we found it in 1509d021c344SAndy King * the listener's accept queue guarantees that the cleanup 1510d021c344SAndy King * function hasn't run yet. 1511d021c344SAndy King */ 1512d021c344SAndy King if (err) { 1513d021c344SAndy King vconnected->rejected = true; 1514f7f9b5e7SClaudio Imbrenda } else { 1515d021c344SAndy King newsock->state = SS_CONNECTED; 1516d021c344SAndy King sock_graft(connected, newsock); 1517f7f9b5e7SClaudio Imbrenda } 1518f7f9b5e7SClaudio Imbrenda 1519d021c344SAndy King release_sock(connected); 1520d021c344SAndy King sock_put(connected); 1521d021c344SAndy King } 1522d021c344SAndy King 1523d021c344SAndy King out: 1524d021c344SAndy King release_sock(listener); 1525d021c344SAndy King return err; 1526d021c344SAndy King } 1527d021c344SAndy King 1528d021c344SAndy King static int vsock_listen(struct socket *sock, int backlog) 1529d021c344SAndy King { 1530d021c344SAndy King int err; 1531d021c344SAndy King struct sock *sk; 1532d021c344SAndy King struct vsock_sock *vsk; 1533d021c344SAndy King 1534d021c344SAndy King sk = sock->sk; 1535d021c344SAndy King 1536d021c344SAndy King lock_sock(sk); 1537d021c344SAndy King 1538a9e29e55SArseny Krasnov if (!sock_type_connectible(sk->sk_type)) { 1539d021c344SAndy King err = -EOPNOTSUPP; 1540d021c344SAndy King goto out; 1541d021c344SAndy King } 1542d021c344SAndy King 1543d021c344SAndy King if (sock->state != SS_UNCONNECTED) { 1544d021c344SAndy King err = -EINVAL; 1545d021c344SAndy King goto out; 1546d021c344SAndy King } 1547d021c344SAndy King 1548d021c344SAndy King vsk = vsock_sk(sk); 1549d021c344SAndy King 1550d021c344SAndy King if (!vsock_addr_bound(&vsk->local_addr)) { 1551d021c344SAndy King err = -EINVAL; 1552d021c344SAndy King goto out; 1553d021c344SAndy King } 1554d021c344SAndy King 1555d021c344SAndy King sk->sk_max_ack_backlog = backlog; 15563b4477d2SStefan Hajnoczi sk->sk_state = TCP_LISTEN; 1557d021c344SAndy King 1558d021c344SAndy King err = 0; 1559d021c344SAndy King 1560d021c344SAndy King out: 1561d021c344SAndy King release_sock(sk); 1562d021c344SAndy King return err; 1563d021c344SAndy King } 1564d021c344SAndy King 1565b9f2b0ffSStefano Garzarella static void vsock_update_buffer_size(struct vsock_sock *vsk, 1566b9f2b0ffSStefano Garzarella const struct vsock_transport *transport, 1567b9f2b0ffSStefano Garzarella u64 val) 1568b9f2b0ffSStefano Garzarella { 1569b9f2b0ffSStefano Garzarella if (val > vsk->buffer_max_size) 1570b9f2b0ffSStefano Garzarella val = vsk->buffer_max_size; 1571b9f2b0ffSStefano Garzarella 1572b9f2b0ffSStefano Garzarella if (val < vsk->buffer_min_size) 1573b9f2b0ffSStefano Garzarella val = vsk->buffer_min_size; 1574b9f2b0ffSStefano Garzarella 1575b9f2b0ffSStefano Garzarella if (val != vsk->buffer_size && 1576b9f2b0ffSStefano Garzarella transport && transport->notify_buffer_size) 1577b9f2b0ffSStefano Garzarella transport->notify_buffer_size(vsk, &val); 1578b9f2b0ffSStefano Garzarella 1579b9f2b0ffSStefano Garzarella vsk->buffer_size = val; 1580b9f2b0ffSStefano Garzarella } 1581b9f2b0ffSStefano Garzarella 1582a9e29e55SArseny Krasnov static int vsock_connectible_setsockopt(struct socket *sock, 1583d021c344SAndy King int level, 1584d021c344SAndy King int optname, 1585a7b75c5aSChristoph Hellwig sockptr_t optval, 1586d021c344SAndy King unsigned int optlen) 1587d021c344SAndy King { 1588d021c344SAndy King int err; 1589d021c344SAndy King struct sock *sk; 1590d021c344SAndy King struct vsock_sock *vsk; 1591fe502c4aSStefano Garzarella const struct vsock_transport *transport; 1592d021c344SAndy King u64 val; 1593d021c344SAndy King 1594d021c344SAndy King if (level != AF_VSOCK) 1595d021c344SAndy King return -ENOPROTOOPT; 1596d021c344SAndy King 1597d021c344SAndy King #define COPY_IN(_v) \ 1598d021c344SAndy King do { \ 1599d021c344SAndy King if (optlen < sizeof(_v)) { \ 1600d021c344SAndy King err = -EINVAL; \ 1601d021c344SAndy King goto exit; \ 1602d021c344SAndy King } \ 1603a7b75c5aSChristoph Hellwig if (copy_from_sockptr(&_v, optval, sizeof(_v)) != 0) { \ 1604d021c344SAndy King err = -EFAULT; \ 1605d021c344SAndy King goto exit; \ 1606d021c344SAndy King } \ 1607d021c344SAndy King } while (0) 1608d021c344SAndy King 1609d021c344SAndy King err = 0; 1610d021c344SAndy King sk = sock->sk; 1611d021c344SAndy King vsk = vsock_sk(sk); 1612d021c344SAndy King 1613d021c344SAndy King lock_sock(sk); 1614d021c344SAndy King 1615c518adafSAlexander Popov transport = vsk->transport; 1616c518adafSAlexander Popov 1617d021c344SAndy King switch (optname) { 1618d021c344SAndy King case SO_VM_SOCKETS_BUFFER_SIZE: 1619d021c344SAndy King COPY_IN(val); 1620b9f2b0ffSStefano Garzarella vsock_update_buffer_size(vsk, transport, val); 1621d021c344SAndy King break; 1622d021c344SAndy King 1623d021c344SAndy King case SO_VM_SOCKETS_BUFFER_MAX_SIZE: 1624d021c344SAndy King COPY_IN(val); 1625b9f2b0ffSStefano Garzarella vsk->buffer_max_size = val; 1626b9f2b0ffSStefano Garzarella vsock_update_buffer_size(vsk, transport, vsk->buffer_size); 1627d021c344SAndy King break; 1628d021c344SAndy King 1629d021c344SAndy King case SO_VM_SOCKETS_BUFFER_MIN_SIZE: 1630d021c344SAndy King COPY_IN(val); 1631b9f2b0ffSStefano Garzarella vsk->buffer_min_size = val; 1632b9f2b0ffSStefano Garzarella vsock_update_buffer_size(vsk, transport, vsk->buffer_size); 1633d021c344SAndy King break; 1634d021c344SAndy King 16354c1e34c0SRichard Palethorpe case SO_VM_SOCKETS_CONNECT_TIMEOUT_NEW: 16364c1e34c0SRichard Palethorpe case SO_VM_SOCKETS_CONNECT_TIMEOUT_OLD: { 16374c1e34c0SRichard Palethorpe struct __kernel_sock_timeval tv; 16384c1e34c0SRichard Palethorpe 16394c1e34c0SRichard Palethorpe err = sock_copy_user_timeval(&tv, optval, optlen, 16404c1e34c0SRichard Palethorpe optname == SO_VM_SOCKETS_CONNECT_TIMEOUT_OLD); 16414c1e34c0SRichard Palethorpe if (err) 16424c1e34c0SRichard Palethorpe break; 1643d021c344SAndy King if (tv.tv_sec >= 0 && tv.tv_usec < USEC_PER_SEC && 1644d021c344SAndy King tv.tv_sec < (MAX_SCHEDULE_TIMEOUT / HZ - 1)) { 1645d021c344SAndy King vsk->connect_timeout = tv.tv_sec * HZ + 16464c1e34c0SRichard Palethorpe DIV_ROUND_UP((unsigned long)tv.tv_usec, (USEC_PER_SEC / HZ)); 1647d021c344SAndy King if (vsk->connect_timeout == 0) 1648d021c344SAndy King vsk->connect_timeout = 1649d021c344SAndy King VSOCK_DEFAULT_CONNECT_TIMEOUT; 1650d021c344SAndy King 1651d021c344SAndy King } else { 1652d021c344SAndy King err = -ERANGE; 1653d021c344SAndy King } 1654d021c344SAndy King break; 1655d021c344SAndy King } 1656d021c344SAndy King 1657d021c344SAndy King default: 1658d021c344SAndy King err = -ENOPROTOOPT; 1659d021c344SAndy King break; 1660d021c344SAndy King } 1661d021c344SAndy King 1662d021c344SAndy King #undef COPY_IN 1663d021c344SAndy King 1664d021c344SAndy King exit: 1665d021c344SAndy King release_sock(sk); 1666d021c344SAndy King return err; 1667d021c344SAndy King } 1668d021c344SAndy King 1669a9e29e55SArseny Krasnov static int vsock_connectible_getsockopt(struct socket *sock, 1670d021c344SAndy King int level, int optname, 1671d021c344SAndy King char __user *optval, 1672d021c344SAndy King int __user *optlen) 1673d021c344SAndy King { 1674685c3f2fSRichard Palethorpe struct sock *sk = sock->sk; 1675685c3f2fSRichard Palethorpe struct vsock_sock *vsk = vsock_sk(sk); 1676685c3f2fSRichard Palethorpe 1677685c3f2fSRichard Palethorpe union { 1678685c3f2fSRichard Palethorpe u64 val64; 16794c1e34c0SRichard Palethorpe struct old_timeval32 tm32; 1680685c3f2fSRichard Palethorpe struct __kernel_old_timeval tm; 16814c1e34c0SRichard Palethorpe struct __kernel_sock_timeval stm; 1682685c3f2fSRichard Palethorpe } v; 1683685c3f2fSRichard Palethorpe 1684685c3f2fSRichard Palethorpe int lv = sizeof(v.val64); 1685d021c344SAndy King int len; 1686d021c344SAndy King 1687d021c344SAndy King if (level != AF_VSOCK) 1688d021c344SAndy King return -ENOPROTOOPT; 1689d021c344SAndy King 1690685c3f2fSRichard Palethorpe if (get_user(len, optlen)) 1691685c3f2fSRichard Palethorpe return -EFAULT; 1692d021c344SAndy King 1693685c3f2fSRichard Palethorpe memset(&v, 0, sizeof(v)); 1694d021c344SAndy King 1695d021c344SAndy King switch (optname) { 1696d021c344SAndy King case SO_VM_SOCKETS_BUFFER_SIZE: 1697685c3f2fSRichard Palethorpe v.val64 = vsk->buffer_size; 1698d021c344SAndy King break; 1699d021c344SAndy King 1700d021c344SAndy King case SO_VM_SOCKETS_BUFFER_MAX_SIZE: 1701685c3f2fSRichard Palethorpe v.val64 = vsk->buffer_max_size; 1702d021c344SAndy King break; 1703d021c344SAndy King 1704d021c344SAndy King case SO_VM_SOCKETS_BUFFER_MIN_SIZE: 1705685c3f2fSRichard Palethorpe v.val64 = vsk->buffer_min_size; 1706d021c344SAndy King break; 1707d021c344SAndy King 17084c1e34c0SRichard Palethorpe case SO_VM_SOCKETS_CONNECT_TIMEOUT_NEW: 17094c1e34c0SRichard Palethorpe case SO_VM_SOCKETS_CONNECT_TIMEOUT_OLD: 17104c1e34c0SRichard Palethorpe lv = sock_get_timeout(vsk->connect_timeout, &v, 17114c1e34c0SRichard Palethorpe optname == SO_VM_SOCKETS_CONNECT_TIMEOUT_OLD); 1712d021c344SAndy King break; 1713685c3f2fSRichard Palethorpe 1714d021c344SAndy King default: 1715d021c344SAndy King return -ENOPROTOOPT; 1716d021c344SAndy King } 1717d021c344SAndy King 1718685c3f2fSRichard Palethorpe if (len < lv) 1719685c3f2fSRichard Palethorpe return -EINVAL; 1720685c3f2fSRichard Palethorpe if (len > lv) 1721685c3f2fSRichard Palethorpe len = lv; 1722685c3f2fSRichard Palethorpe if (copy_to_user(optval, &v, len)) 1723d021c344SAndy King return -EFAULT; 1724d021c344SAndy King 1725685c3f2fSRichard Palethorpe if (put_user(len, optlen)) 1726685c3f2fSRichard Palethorpe return -EFAULT; 1727d021c344SAndy King 1728d021c344SAndy King return 0; 1729d021c344SAndy King } 1730d021c344SAndy King 1731a9e29e55SArseny Krasnov static int vsock_connectible_sendmsg(struct socket *sock, struct msghdr *msg, 17321b784140SYing Xue size_t len) 1733d021c344SAndy King { 1734d021c344SAndy King struct sock *sk; 1735d021c344SAndy King struct vsock_sock *vsk; 1736fe502c4aSStefano Garzarella const struct vsock_transport *transport; 1737d021c344SAndy King ssize_t total_written; 1738d021c344SAndy King long timeout; 1739d021c344SAndy King int err; 1740d021c344SAndy King struct vsock_transport_send_notify_data send_data; 1741499fde66SWANG Cong DEFINE_WAIT_FUNC(wait, woken_wake_function); 1742d021c344SAndy King 1743d021c344SAndy King sk = sock->sk; 1744d021c344SAndy King vsk = vsock_sk(sk); 1745d021c344SAndy King total_written = 0; 1746d021c344SAndy King err = 0; 1747d021c344SAndy King 1748d021c344SAndy King if (msg->msg_flags & MSG_OOB) 1749d021c344SAndy King return -EOPNOTSUPP; 1750d021c344SAndy King 1751d021c344SAndy King lock_sock(sk); 1752d021c344SAndy King 1753c518adafSAlexander Popov transport = vsk->transport; 1754c518adafSAlexander Popov 17558cb48554SArseny Krasnov /* Callers should not provide a destination with connection oriented 17568cb48554SArseny Krasnov * sockets. 17578cb48554SArseny Krasnov */ 1758d021c344SAndy King if (msg->msg_namelen) { 17593b4477d2SStefan Hajnoczi err = sk->sk_state == TCP_ESTABLISHED ? -EISCONN : -EOPNOTSUPP; 1760d021c344SAndy King goto out; 1761d021c344SAndy King } 1762d021c344SAndy King 1763d021c344SAndy King /* Send data only if both sides are not shutdown in the direction. */ 1764d021c344SAndy King if (sk->sk_shutdown & SEND_SHUTDOWN || 1765d021c344SAndy King vsk->peer_shutdown & RCV_SHUTDOWN) { 1766d021c344SAndy King err = -EPIPE; 1767d021c344SAndy King goto out; 1768d021c344SAndy King } 1769d021c344SAndy King 1770c0cfa2d8SStefano Garzarella if (!transport || sk->sk_state != TCP_ESTABLISHED || 1771d021c344SAndy King !vsock_addr_bound(&vsk->local_addr)) { 1772d021c344SAndy King err = -ENOTCONN; 1773d021c344SAndy King goto out; 1774d021c344SAndy King } 1775d021c344SAndy King 1776d021c344SAndy King if (!vsock_addr_bound(&vsk->remote_addr)) { 1777d021c344SAndy King err = -EDESTADDRREQ; 1778d021c344SAndy King goto out; 1779d021c344SAndy King } 1780d021c344SAndy King 1781d021c344SAndy King /* Wait for room in the produce queue to enqueue our user's data. */ 1782d021c344SAndy King timeout = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT); 1783d021c344SAndy King 1784d021c344SAndy King err = transport->notify_send_init(vsk, &send_data); 1785d021c344SAndy King if (err < 0) 1786d021c344SAndy King goto out; 1787d021c344SAndy King 1788d021c344SAndy King while (total_written < len) { 1789d021c344SAndy King ssize_t written; 1790d021c344SAndy King 1791499fde66SWANG Cong add_wait_queue(sk_sleep(sk), &wait); 1792d021c344SAndy King while (vsock_stream_has_space(vsk) == 0 && 1793d021c344SAndy King sk->sk_err == 0 && 1794d021c344SAndy King !(sk->sk_shutdown & SEND_SHUTDOWN) && 1795d021c344SAndy King !(vsk->peer_shutdown & RCV_SHUTDOWN)) { 1796d021c344SAndy King 1797d021c344SAndy King /* Don't wait for non-blocking sockets. */ 1798d021c344SAndy King if (timeout == 0) { 1799d021c344SAndy King err = -EAGAIN; 1800499fde66SWANG Cong remove_wait_queue(sk_sleep(sk), &wait); 1801f7f9b5e7SClaudio Imbrenda goto out_err; 1802d021c344SAndy King } 1803d021c344SAndy King 1804d021c344SAndy King err = transport->notify_send_pre_block(vsk, &send_data); 1805f7f9b5e7SClaudio Imbrenda if (err < 0) { 1806499fde66SWANG Cong remove_wait_queue(sk_sleep(sk), &wait); 1807f7f9b5e7SClaudio Imbrenda goto out_err; 1808f7f9b5e7SClaudio Imbrenda } 1809d021c344SAndy King 1810d021c344SAndy King release_sock(sk); 1811499fde66SWANG Cong timeout = wait_woken(&wait, TASK_INTERRUPTIBLE, timeout); 1812d021c344SAndy King lock_sock(sk); 1813d021c344SAndy King if (signal_pending(current)) { 1814d021c344SAndy King err = sock_intr_errno(timeout); 1815499fde66SWANG Cong remove_wait_queue(sk_sleep(sk), &wait); 1816f7f9b5e7SClaudio Imbrenda goto out_err; 1817d021c344SAndy King } else if (timeout == 0) { 1818d021c344SAndy King err = -EAGAIN; 1819499fde66SWANG Cong remove_wait_queue(sk_sleep(sk), &wait); 1820f7f9b5e7SClaudio Imbrenda goto out_err; 1821d021c344SAndy King } 1822d021c344SAndy King } 1823499fde66SWANG Cong remove_wait_queue(sk_sleep(sk), &wait); 1824d021c344SAndy King 1825d021c344SAndy King /* These checks occur both as part of and after the loop 1826d021c344SAndy King * conditional since we need to check before and after 1827d021c344SAndy King * sleeping. 1828d021c344SAndy King */ 1829d021c344SAndy King if (sk->sk_err) { 1830d021c344SAndy King err = -sk->sk_err; 1831f7f9b5e7SClaudio Imbrenda goto out_err; 1832d021c344SAndy King } else if ((sk->sk_shutdown & SEND_SHUTDOWN) || 1833d021c344SAndy King (vsk->peer_shutdown & RCV_SHUTDOWN)) { 1834d021c344SAndy King err = -EPIPE; 1835f7f9b5e7SClaudio Imbrenda goto out_err; 1836d021c344SAndy King } 1837d021c344SAndy King 1838d021c344SAndy King err = transport->notify_send_pre_enqueue(vsk, &send_data); 1839d021c344SAndy King if (err < 0) 1840f7f9b5e7SClaudio Imbrenda goto out_err; 1841d021c344SAndy King 1842d021c344SAndy King /* Note that enqueue will only write as many bytes as are free 1843d021c344SAndy King * in the produce queue, so we don't need to ensure len is 1844d021c344SAndy King * smaller than the queue size. It is the caller's 1845d021c344SAndy King * responsibility to check how many bytes we were able to send. 1846d021c344SAndy King */ 1847d021c344SAndy King 1848fbe70c48SArseny Krasnov if (sk->sk_type == SOCK_SEQPACKET) { 1849fbe70c48SArseny Krasnov written = transport->seqpacket_enqueue(vsk, 1850fbe70c48SArseny Krasnov msg, len - total_written); 1851fbe70c48SArseny Krasnov } else { 1852fbe70c48SArseny Krasnov written = transport->stream_enqueue(vsk, 1853fbe70c48SArseny Krasnov msg, len - total_written); 1854fbe70c48SArseny Krasnov } 1855d021c344SAndy King if (written < 0) { 1856d021c344SAndy King err = -ENOMEM; 1857f7f9b5e7SClaudio Imbrenda goto out_err; 1858d021c344SAndy King } 1859d021c344SAndy King 1860d021c344SAndy King total_written += written; 1861d021c344SAndy King 1862d021c344SAndy King err = transport->notify_send_post_enqueue( 1863d021c344SAndy King vsk, written, &send_data); 1864d021c344SAndy King if (err < 0) 1865f7f9b5e7SClaudio Imbrenda goto out_err; 1866d021c344SAndy King 1867d021c344SAndy King } 1868d021c344SAndy King 1869f7f9b5e7SClaudio Imbrenda out_err: 1870fbe70c48SArseny Krasnov if (total_written > 0) { 1871fbe70c48SArseny Krasnov /* Return number of written bytes only if: 1872fbe70c48SArseny Krasnov * 1) SOCK_STREAM socket. 1873fbe70c48SArseny Krasnov * 2) SOCK_SEQPACKET socket when whole buffer is sent. 1874fbe70c48SArseny Krasnov */ 1875fbe70c48SArseny Krasnov if (sk->sk_type == SOCK_STREAM || total_written == len) 1876d021c344SAndy King err = total_written; 1877fbe70c48SArseny Krasnov } 1878d021c344SAndy King out: 1879d021c344SAndy King release_sock(sk); 1880d021c344SAndy King return err; 1881d021c344SAndy King } 1882d021c344SAndy King 18830de5b2e6SStefano Garzarella static int vsock_connectible_wait_data(struct sock *sk, 18840de5b2e6SStefano Garzarella struct wait_queue_entry *wait, 1885b3f7fd54SArseny Krasnov long timeout, 1886b3f7fd54SArseny Krasnov struct vsock_transport_recv_notify_data *recv_data, 1887b3f7fd54SArseny Krasnov size_t target) 1888b3f7fd54SArseny Krasnov { 1889b3f7fd54SArseny Krasnov const struct vsock_transport *transport; 1890b3f7fd54SArseny Krasnov struct vsock_sock *vsk; 1891b3f7fd54SArseny Krasnov s64 data; 1892b3f7fd54SArseny Krasnov int err; 1893b3f7fd54SArseny Krasnov 1894b3f7fd54SArseny Krasnov vsk = vsock_sk(sk); 1895b3f7fd54SArseny Krasnov err = 0; 1896b3f7fd54SArseny Krasnov transport = vsk->transport; 1897b3f7fd54SArseny Krasnov 1898cc97141aSStefano Garzarella while ((data = vsock_connectible_has_data(vsk)) == 0) { 1899b3f7fd54SArseny Krasnov prepare_to_wait(sk_sleep(sk), wait, TASK_INTERRUPTIBLE); 1900b3f7fd54SArseny Krasnov 1901b3f7fd54SArseny Krasnov if (sk->sk_err != 0 || 1902b3f7fd54SArseny Krasnov (sk->sk_shutdown & RCV_SHUTDOWN) || 1903b3f7fd54SArseny Krasnov (vsk->peer_shutdown & SEND_SHUTDOWN)) { 1904b3f7fd54SArseny Krasnov break; 1905b3f7fd54SArseny Krasnov } 1906b3f7fd54SArseny Krasnov 1907b3f7fd54SArseny Krasnov /* Don't wait for non-blocking sockets. */ 1908b3f7fd54SArseny Krasnov if (timeout == 0) { 1909b3f7fd54SArseny Krasnov err = -EAGAIN; 1910b3f7fd54SArseny Krasnov break; 1911b3f7fd54SArseny Krasnov } 1912b3f7fd54SArseny Krasnov 1913b3f7fd54SArseny Krasnov if (recv_data) { 1914b3f7fd54SArseny Krasnov err = transport->notify_recv_pre_block(vsk, target, recv_data); 1915b3f7fd54SArseny Krasnov if (err < 0) 1916b3f7fd54SArseny Krasnov break; 1917b3f7fd54SArseny Krasnov } 1918b3f7fd54SArseny Krasnov 1919b3f7fd54SArseny Krasnov release_sock(sk); 1920b3f7fd54SArseny Krasnov timeout = schedule_timeout(timeout); 1921b3f7fd54SArseny Krasnov lock_sock(sk); 1922b3f7fd54SArseny Krasnov 1923b3f7fd54SArseny Krasnov if (signal_pending(current)) { 1924b3f7fd54SArseny Krasnov err = sock_intr_errno(timeout); 1925b3f7fd54SArseny Krasnov break; 1926b3f7fd54SArseny Krasnov } else if (timeout == 0) { 1927b3f7fd54SArseny Krasnov err = -EAGAIN; 1928b3f7fd54SArseny Krasnov break; 1929b3f7fd54SArseny Krasnov } 1930b3f7fd54SArseny Krasnov } 1931b3f7fd54SArseny Krasnov 1932b3f7fd54SArseny Krasnov finish_wait(sk_sleep(sk), wait); 1933b3f7fd54SArseny Krasnov 1934b3f7fd54SArseny Krasnov if (err) 1935b3f7fd54SArseny Krasnov return err; 1936b3f7fd54SArseny Krasnov 1937b3f7fd54SArseny Krasnov /* Internal transport error when checking for available 1938b3f7fd54SArseny Krasnov * data. XXX This should be changed to a connection 1939b3f7fd54SArseny Krasnov * reset in a later change. 1940b3f7fd54SArseny Krasnov */ 1941b3f7fd54SArseny Krasnov if (data < 0) 1942b3f7fd54SArseny Krasnov return -ENOMEM; 1943b3f7fd54SArseny Krasnov 1944b3f7fd54SArseny Krasnov return data; 1945b3f7fd54SArseny Krasnov } 1946b3f7fd54SArseny Krasnov 194719c1b90eSArseny Krasnov static int __vsock_stream_recvmsg(struct sock *sk, struct msghdr *msg, 194819c1b90eSArseny Krasnov size_t len, int flags) 1949d021c344SAndy King { 1950d021c344SAndy King struct vsock_transport_recv_notify_data recv_data; 195119c1b90eSArseny Krasnov const struct vsock_transport *transport; 195219c1b90eSArseny Krasnov struct vsock_sock *vsk; 195319c1b90eSArseny Krasnov ssize_t copied; 195419c1b90eSArseny Krasnov size_t target; 195519c1b90eSArseny Krasnov long timeout; 195619c1b90eSArseny Krasnov int err; 1957d021c344SAndy King 1958d021c344SAndy King DEFINE_WAIT(wait); 1959d021c344SAndy King 1960d021c344SAndy King vsk = vsock_sk(sk); 1961c518adafSAlexander Popov transport = vsk->transport; 1962c518adafSAlexander Popov 1963d021c344SAndy King /* We must not copy less than target bytes into the user's buffer 1964d021c344SAndy King * before returning successfully, so we wait for the consume queue to 1965d021c344SAndy King * have that much data to consume before dequeueing. Note that this 1966d021c344SAndy King * makes it impossible to handle cases where target is greater than the 1967d021c344SAndy King * queue size. 1968d021c344SAndy King */ 1969d021c344SAndy King target = sock_rcvlowat(sk, flags & MSG_WAITALL, len); 1970d021c344SAndy King if (target >= transport->stream_rcvhiwat(vsk)) { 1971d021c344SAndy King err = -ENOMEM; 1972d021c344SAndy King goto out; 1973d021c344SAndy King } 1974d021c344SAndy King timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); 1975d021c344SAndy King copied = 0; 1976d021c344SAndy King 1977d021c344SAndy King err = transport->notify_recv_init(vsk, target, &recv_data); 1978d021c344SAndy King if (err < 0) 1979d021c344SAndy King goto out; 1980d021c344SAndy King 1981d021c344SAndy King 1982d021c344SAndy King while (1) { 1983f7f9b5e7SClaudio Imbrenda ssize_t read; 1984f7f9b5e7SClaudio Imbrenda 19850de5b2e6SStefano Garzarella err = vsock_connectible_wait_data(sk, &wait, timeout, 19860de5b2e6SStefano Garzarella &recv_data, target); 1987b3f7fd54SArseny Krasnov if (err <= 0) 1988b3f7fd54SArseny Krasnov break; 1989d021c344SAndy King 1990b3f7fd54SArseny Krasnov err = transport->notify_recv_pre_dequeue(vsk, target, 1991b3f7fd54SArseny Krasnov &recv_data); 1992d021c344SAndy King if (err < 0) 1993d021c344SAndy King break; 1994d021c344SAndy King 1995b3f7fd54SArseny Krasnov read = transport->stream_dequeue(vsk, msg, len - copied, flags); 1996d021c344SAndy King if (read < 0) { 1997d021c344SAndy King err = -ENOMEM; 1998d021c344SAndy King break; 1999d021c344SAndy King } 2000d021c344SAndy King 2001d021c344SAndy King copied += read; 2002d021c344SAndy King 2003b3f7fd54SArseny Krasnov err = transport->notify_recv_post_dequeue(vsk, target, read, 2004d021c344SAndy King !(flags & MSG_PEEK), &recv_data); 2005d021c344SAndy King if (err < 0) 2006f7f9b5e7SClaudio Imbrenda goto out; 2007d021c344SAndy King 2008d021c344SAndy King if (read >= target || flags & MSG_PEEK) 2009d021c344SAndy King break; 2010d021c344SAndy King 2011d021c344SAndy King target -= read; 2012d021c344SAndy King } 2013d021c344SAndy King 2014d021c344SAndy King if (sk->sk_err) 2015d021c344SAndy King err = -sk->sk_err; 2016d021c344SAndy King else if (sk->sk_shutdown & RCV_SHUTDOWN) 2017d021c344SAndy King err = 0; 2018d021c344SAndy King 2019dedc58e0SIan Campbell if (copied > 0) 2020d021c344SAndy King err = copied; 2021d021c344SAndy King 2022d021c344SAndy King out: 202319c1b90eSArseny Krasnov return err; 202419c1b90eSArseny Krasnov } 202519c1b90eSArseny Krasnov 20269942c192SArseny Krasnov static int __vsock_seqpacket_recvmsg(struct sock *sk, struct msghdr *msg, 20279942c192SArseny Krasnov size_t len, int flags) 20289942c192SArseny Krasnov { 20299942c192SArseny Krasnov const struct vsock_transport *transport; 20309942c192SArseny Krasnov struct vsock_sock *vsk; 20318fc92b7cSArseny Krasnov ssize_t msg_len; 20329942c192SArseny Krasnov long timeout; 20339942c192SArseny Krasnov int err = 0; 20349942c192SArseny Krasnov DEFINE_WAIT(wait); 20359942c192SArseny Krasnov 20369942c192SArseny Krasnov vsk = vsock_sk(sk); 20379942c192SArseny Krasnov transport = vsk->transport; 20389942c192SArseny Krasnov 20399942c192SArseny Krasnov timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); 20409942c192SArseny Krasnov 20410de5b2e6SStefano Garzarella err = vsock_connectible_wait_data(sk, &wait, timeout, NULL, 0); 20429942c192SArseny Krasnov if (err <= 0) 20439942c192SArseny Krasnov goto out; 20449942c192SArseny Krasnov 20458fc92b7cSArseny Krasnov msg_len = transport->seqpacket_dequeue(vsk, msg, flags); 20469942c192SArseny Krasnov 20478fc92b7cSArseny Krasnov if (msg_len < 0) { 20489942c192SArseny Krasnov err = -ENOMEM; 20499942c192SArseny Krasnov goto out; 20509942c192SArseny Krasnov } 20519942c192SArseny Krasnov 20529942c192SArseny Krasnov if (sk->sk_err) { 20539942c192SArseny Krasnov err = -sk->sk_err; 20549942c192SArseny Krasnov } else if (sk->sk_shutdown & RCV_SHUTDOWN) { 20559942c192SArseny Krasnov err = 0; 20569942c192SArseny Krasnov } else { 20579942c192SArseny Krasnov /* User sets MSG_TRUNC, so return real length of 20589942c192SArseny Krasnov * packet. 20599942c192SArseny Krasnov */ 20609942c192SArseny Krasnov if (flags & MSG_TRUNC) 20618fc92b7cSArseny Krasnov err = msg_len; 20629942c192SArseny Krasnov else 20639942c192SArseny Krasnov err = len - msg_data_left(msg); 20649942c192SArseny Krasnov 20659942c192SArseny Krasnov /* Always set MSG_TRUNC if real length of packet is 20669942c192SArseny Krasnov * bigger than user's buffer. 20679942c192SArseny Krasnov */ 20688fc92b7cSArseny Krasnov if (msg_len > len) 20699942c192SArseny Krasnov msg->msg_flags |= MSG_TRUNC; 20709942c192SArseny Krasnov } 20719942c192SArseny Krasnov 20729942c192SArseny Krasnov out: 20739942c192SArseny Krasnov return err; 20749942c192SArseny Krasnov } 20759942c192SArseny Krasnov 207619c1b90eSArseny Krasnov static int 207719c1b90eSArseny Krasnov vsock_connectible_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, 207819c1b90eSArseny Krasnov int flags) 207919c1b90eSArseny Krasnov { 208019c1b90eSArseny Krasnov struct sock *sk; 208119c1b90eSArseny Krasnov struct vsock_sock *vsk; 208219c1b90eSArseny Krasnov const struct vsock_transport *transport; 208319c1b90eSArseny Krasnov int err; 208419c1b90eSArseny Krasnov 208519c1b90eSArseny Krasnov DEFINE_WAIT(wait); 208619c1b90eSArseny Krasnov 208719c1b90eSArseny Krasnov sk = sock->sk; 208819c1b90eSArseny Krasnov vsk = vsock_sk(sk); 208919c1b90eSArseny Krasnov err = 0; 209019c1b90eSArseny Krasnov 209119c1b90eSArseny Krasnov lock_sock(sk); 209219c1b90eSArseny Krasnov 209319c1b90eSArseny Krasnov transport = vsk->transport; 209419c1b90eSArseny Krasnov 209519c1b90eSArseny Krasnov if (!transport || sk->sk_state != TCP_ESTABLISHED) { 209619c1b90eSArseny Krasnov /* Recvmsg is supposed to return 0 if a peer performs an 209719c1b90eSArseny Krasnov * orderly shutdown. Differentiate between that case and when a 209819c1b90eSArseny Krasnov * peer has not connected or a local shutdown occurred with the 209919c1b90eSArseny Krasnov * SOCK_DONE flag. 210019c1b90eSArseny Krasnov */ 210119c1b90eSArseny Krasnov if (sock_flag(sk, SOCK_DONE)) 210219c1b90eSArseny Krasnov err = 0; 210319c1b90eSArseny Krasnov else 210419c1b90eSArseny Krasnov err = -ENOTCONN; 210519c1b90eSArseny Krasnov 210619c1b90eSArseny Krasnov goto out; 210719c1b90eSArseny Krasnov } 210819c1b90eSArseny Krasnov 210919c1b90eSArseny Krasnov if (flags & MSG_OOB) { 211019c1b90eSArseny Krasnov err = -EOPNOTSUPP; 211119c1b90eSArseny Krasnov goto out; 211219c1b90eSArseny Krasnov } 211319c1b90eSArseny Krasnov 211419c1b90eSArseny Krasnov /* We don't check peer_shutdown flag here since peer may actually shut 211519c1b90eSArseny Krasnov * down, but there can be data in the queue that a local socket can 211619c1b90eSArseny Krasnov * receive. 211719c1b90eSArseny Krasnov */ 211819c1b90eSArseny Krasnov if (sk->sk_shutdown & RCV_SHUTDOWN) { 211919c1b90eSArseny Krasnov err = 0; 212019c1b90eSArseny Krasnov goto out; 212119c1b90eSArseny Krasnov } 212219c1b90eSArseny Krasnov 212319c1b90eSArseny Krasnov /* It is valid on Linux to pass in a zero-length receive buffer. This 212419c1b90eSArseny Krasnov * is not an error. We may as well bail out now. 212519c1b90eSArseny Krasnov */ 212619c1b90eSArseny Krasnov if (!len) { 212719c1b90eSArseny Krasnov err = 0; 212819c1b90eSArseny Krasnov goto out; 212919c1b90eSArseny Krasnov } 213019c1b90eSArseny Krasnov 21319942c192SArseny Krasnov if (sk->sk_type == SOCK_STREAM) 213219c1b90eSArseny Krasnov err = __vsock_stream_recvmsg(sk, msg, len, flags); 21339942c192SArseny Krasnov else 21349942c192SArseny Krasnov err = __vsock_seqpacket_recvmsg(sk, msg, len, flags); 213519c1b90eSArseny Krasnov 213619c1b90eSArseny Krasnov out: 2137d021c344SAndy King release_sock(sk); 2138d021c344SAndy King return err; 2139d021c344SAndy King } 2140d021c344SAndy King 2141e38f22c8SArseniy Krasnov static int vsock_set_rcvlowat(struct sock *sk, int val) 2142e38f22c8SArseniy Krasnov { 2143e38f22c8SArseniy Krasnov const struct vsock_transport *transport; 2144e38f22c8SArseniy Krasnov struct vsock_sock *vsk; 2145e38f22c8SArseniy Krasnov 2146e38f22c8SArseniy Krasnov vsk = vsock_sk(sk); 2147e38f22c8SArseniy Krasnov 2148e38f22c8SArseniy Krasnov if (val > vsk->buffer_size) 2149e38f22c8SArseniy Krasnov return -EINVAL; 2150e38f22c8SArseniy Krasnov 2151e38f22c8SArseniy Krasnov transport = vsk->transport; 2152e38f22c8SArseniy Krasnov 2153e38f22c8SArseniy Krasnov if (transport && transport->set_rcvlowat) 2154e38f22c8SArseniy Krasnov return transport->set_rcvlowat(vsk, val); 2155e38f22c8SArseniy Krasnov 2156e38f22c8SArseniy Krasnov WRITE_ONCE(sk->sk_rcvlowat, val ? : 1); 2157e38f22c8SArseniy Krasnov return 0; 2158e38f22c8SArseniy Krasnov } 2159e38f22c8SArseniy Krasnov 2160d021c344SAndy King static const struct proto_ops vsock_stream_ops = { 2161d021c344SAndy King .family = PF_VSOCK, 2162d021c344SAndy King .owner = THIS_MODULE, 2163d021c344SAndy King .release = vsock_release, 2164d021c344SAndy King .bind = vsock_bind, 2165a9e29e55SArseny Krasnov .connect = vsock_connect, 2166d021c344SAndy King .socketpair = sock_no_socketpair, 2167d021c344SAndy King .accept = vsock_accept, 2168d021c344SAndy King .getname = vsock_getname, 2169a11e1d43SLinus Torvalds .poll = vsock_poll, 2170d021c344SAndy King .ioctl = sock_no_ioctl, 2171d021c344SAndy King .listen = vsock_listen, 2172d021c344SAndy King .shutdown = vsock_shutdown, 2173a9e29e55SArseny Krasnov .setsockopt = vsock_connectible_setsockopt, 2174a9e29e55SArseny Krasnov .getsockopt = vsock_connectible_getsockopt, 2175a9e29e55SArseny Krasnov .sendmsg = vsock_connectible_sendmsg, 2176a9e29e55SArseny Krasnov .recvmsg = vsock_connectible_recvmsg, 2177d021c344SAndy King .mmap = sock_no_mmap, 2178d021c344SAndy King .sendpage = sock_no_sendpage, 2179e38f22c8SArseniy Krasnov .set_rcvlowat = vsock_set_rcvlowat, 2180d021c344SAndy King }; 2181d021c344SAndy King 21820798e78bSArseny Krasnov static const struct proto_ops vsock_seqpacket_ops = { 21830798e78bSArseny Krasnov .family = PF_VSOCK, 21840798e78bSArseny Krasnov .owner = THIS_MODULE, 21850798e78bSArseny Krasnov .release = vsock_release, 21860798e78bSArseny Krasnov .bind = vsock_bind, 21870798e78bSArseny Krasnov .connect = vsock_connect, 21880798e78bSArseny Krasnov .socketpair = sock_no_socketpair, 21890798e78bSArseny Krasnov .accept = vsock_accept, 21900798e78bSArseny Krasnov .getname = vsock_getname, 21910798e78bSArseny Krasnov .poll = vsock_poll, 21920798e78bSArseny Krasnov .ioctl = sock_no_ioctl, 21930798e78bSArseny Krasnov .listen = vsock_listen, 21940798e78bSArseny Krasnov .shutdown = vsock_shutdown, 21950798e78bSArseny Krasnov .setsockopt = vsock_connectible_setsockopt, 21960798e78bSArseny Krasnov .getsockopt = vsock_connectible_getsockopt, 21970798e78bSArseny Krasnov .sendmsg = vsock_connectible_sendmsg, 21980798e78bSArseny Krasnov .recvmsg = vsock_connectible_recvmsg, 21990798e78bSArseny Krasnov .mmap = sock_no_mmap, 22000798e78bSArseny Krasnov .sendpage = sock_no_sendpage, 22010798e78bSArseny Krasnov }; 22020798e78bSArseny Krasnov 2203d021c344SAndy King static int vsock_create(struct net *net, struct socket *sock, 2204d021c344SAndy King int protocol, int kern) 2205d021c344SAndy King { 2206c0cfa2d8SStefano Garzarella struct vsock_sock *vsk; 220755f3e149SStefano Garzarella struct sock *sk; 2208c0cfa2d8SStefano Garzarella int ret; 220955f3e149SStefano Garzarella 2210d021c344SAndy King if (!sock) 2211d021c344SAndy King return -EINVAL; 2212d021c344SAndy King 22136cf1c5fcSAndy King if (protocol && protocol != PF_VSOCK) 2214d021c344SAndy King return -EPROTONOSUPPORT; 2215d021c344SAndy King 2216d021c344SAndy King switch (sock->type) { 2217d021c344SAndy King case SOCK_DGRAM: 2218d021c344SAndy King sock->ops = &vsock_dgram_ops; 2219d021c344SAndy King break; 2220d021c344SAndy King case SOCK_STREAM: 2221d021c344SAndy King sock->ops = &vsock_stream_ops; 2222d021c344SAndy King break; 22230798e78bSArseny Krasnov case SOCK_SEQPACKET: 22240798e78bSArseny Krasnov sock->ops = &vsock_seqpacket_ops; 22250798e78bSArseny Krasnov break; 2226d021c344SAndy King default: 2227d021c344SAndy King return -ESOCKTNOSUPPORT; 2228d021c344SAndy King } 2229d021c344SAndy King 2230d021c344SAndy King sock->state = SS_UNCONNECTED; 2231d021c344SAndy King 223255f3e149SStefano Garzarella sk = __vsock_create(net, sock, NULL, GFP_KERNEL, 0, kern); 223355f3e149SStefano Garzarella if (!sk) 223455f3e149SStefano Garzarella return -ENOMEM; 223555f3e149SStefano Garzarella 2236c0cfa2d8SStefano Garzarella vsk = vsock_sk(sk); 2237c0cfa2d8SStefano Garzarella 2238c0cfa2d8SStefano Garzarella if (sock->type == SOCK_DGRAM) { 2239c0cfa2d8SStefano Garzarella ret = vsock_assign_transport(vsk, NULL); 2240c0cfa2d8SStefano Garzarella if (ret < 0) { 2241c0cfa2d8SStefano Garzarella sock_put(sk); 2242c0cfa2d8SStefano Garzarella return ret; 2243c0cfa2d8SStefano Garzarella } 2244c0cfa2d8SStefano Garzarella } 2245c0cfa2d8SStefano Garzarella 2246c0cfa2d8SStefano Garzarella vsock_insert_unbound(vsk); 224755f3e149SStefano Garzarella 224855f3e149SStefano Garzarella return 0; 2249d021c344SAndy King } 2250d021c344SAndy King 2251d021c344SAndy King static const struct net_proto_family vsock_family_ops = { 2252d021c344SAndy King .family = AF_VSOCK, 2253d021c344SAndy King .create = vsock_create, 2254d021c344SAndy King .owner = THIS_MODULE, 2255d021c344SAndy King }; 2256d021c344SAndy King 2257d021c344SAndy King static long vsock_dev_do_ioctl(struct file *filp, 2258d021c344SAndy King unsigned int cmd, void __user *ptr) 2259d021c344SAndy King { 2260d021c344SAndy King u32 __user *p = ptr; 2261c0cfa2d8SStefano Garzarella u32 cid = VMADDR_CID_ANY; 2262d021c344SAndy King int retval = 0; 2263d021c344SAndy King 2264d021c344SAndy King switch (cmd) { 2265d021c344SAndy King case IOCTL_VM_SOCKETS_GET_LOCAL_CID: 2266c0cfa2d8SStefano Garzarella /* To be compatible with the VMCI behavior, we prioritize the 2267c0cfa2d8SStefano Garzarella * guest CID instead of well-know host CID (VMADDR_CID_HOST). 2268c0cfa2d8SStefano Garzarella */ 2269c0cfa2d8SStefano Garzarella if (transport_g2h) 2270c0cfa2d8SStefano Garzarella cid = transport_g2h->get_local_cid(); 2271c0cfa2d8SStefano Garzarella else if (transport_h2g) 2272c0cfa2d8SStefano Garzarella cid = transport_h2g->get_local_cid(); 2273c0cfa2d8SStefano Garzarella 2274c0cfa2d8SStefano Garzarella if (put_user(cid, p) != 0) 2275d021c344SAndy King retval = -EFAULT; 2276d021c344SAndy King break; 2277d021c344SAndy King 2278d021c344SAndy King default: 2279c3e448cdSColin Ian King retval = -ENOIOCTLCMD; 2280d021c344SAndy King } 2281d021c344SAndy King 2282d021c344SAndy King return retval; 2283d021c344SAndy King } 2284d021c344SAndy King 2285d021c344SAndy King static long vsock_dev_ioctl(struct file *filp, 2286d021c344SAndy King unsigned int cmd, unsigned long arg) 2287d021c344SAndy King { 2288d021c344SAndy King return vsock_dev_do_ioctl(filp, cmd, (void __user *)arg); 2289d021c344SAndy King } 2290d021c344SAndy King 2291d021c344SAndy King #ifdef CONFIG_COMPAT 2292d021c344SAndy King static long vsock_dev_compat_ioctl(struct file *filp, 2293d021c344SAndy King unsigned int cmd, unsigned long arg) 2294d021c344SAndy King { 2295d021c344SAndy King return vsock_dev_do_ioctl(filp, cmd, compat_ptr(arg)); 2296d021c344SAndy King } 2297d021c344SAndy King #endif 2298d021c344SAndy King 2299d021c344SAndy King static const struct file_operations vsock_device_ops = { 2300d021c344SAndy King .owner = THIS_MODULE, 2301d021c344SAndy King .unlocked_ioctl = vsock_dev_ioctl, 2302d021c344SAndy King #ifdef CONFIG_COMPAT 2303d021c344SAndy King .compat_ioctl = vsock_dev_compat_ioctl, 2304d021c344SAndy King #endif 2305d021c344SAndy King .open = nonseekable_open, 2306d021c344SAndy King }; 2307d021c344SAndy King 2308d021c344SAndy King static struct miscdevice vsock_device = { 2309d021c344SAndy King .name = "vsock", 2310d021c344SAndy King .fops = &vsock_device_ops, 2311d021c344SAndy King }; 2312d021c344SAndy King 2313c0cfa2d8SStefano Garzarella static int __init vsock_init(void) 2314d021c344SAndy King { 2315c0cfa2d8SStefano Garzarella int err = 0; 23162c4a336eSAndy King 2317c0cfa2d8SStefano Garzarella vsock_init_tables(); 23182c4a336eSAndy King 2319c0cfa2d8SStefano Garzarella vsock_proto.owner = THIS_MODULE; 23206ad0b2f7SAsias He vsock_device.minor = MISC_DYNAMIC_MINOR; 2321d021c344SAndy King err = misc_register(&vsock_device); 2322d021c344SAndy King if (err) { 2323d021c344SAndy King pr_err("Failed to register misc device\n"); 2324f6a835bbSGao feng goto err_reset_transport; 2325d021c344SAndy King } 2326d021c344SAndy King 2327d021c344SAndy King err = proto_register(&vsock_proto, 1); /* we want our slab */ 2328d021c344SAndy King if (err) { 2329d021c344SAndy King pr_err("Cannot register vsock protocol\n"); 2330f6a835bbSGao feng goto err_deregister_misc; 2331d021c344SAndy King } 2332d021c344SAndy King 2333d021c344SAndy King err = sock_register(&vsock_family_ops); 2334d021c344SAndy King if (err) { 2335d021c344SAndy King pr_err("could not register af_vsock (%d) address family: %d\n", 2336d021c344SAndy King AF_VSOCK, err); 2337d021c344SAndy King goto err_unregister_proto; 2338d021c344SAndy King } 2339d021c344SAndy King 2340d021c344SAndy King return 0; 2341d021c344SAndy King 2342d021c344SAndy King err_unregister_proto: 2343d021c344SAndy King proto_unregister(&vsock_proto); 2344f6a835bbSGao feng err_deregister_misc: 2345d021c344SAndy King misc_deregister(&vsock_device); 2346f6a835bbSGao feng err_reset_transport: 2347d021c344SAndy King return err; 2348d021c344SAndy King } 2349d021c344SAndy King 2350c0cfa2d8SStefano Garzarella static void __exit vsock_exit(void) 2351d021c344SAndy King { 2352d021c344SAndy King misc_deregister(&vsock_device); 2353d021c344SAndy King sock_unregister(AF_VSOCK); 2354d021c344SAndy King proto_unregister(&vsock_proto); 2355d021c344SAndy King } 2356d021c344SAndy King 2357daabfbcaSStefano Garzarella const struct vsock_transport *vsock_core_get_transport(struct vsock_sock *vsk) 23580b01aeb3SStefan Hajnoczi { 2359daabfbcaSStefano Garzarella return vsk->transport; 23600b01aeb3SStefan Hajnoczi } 23610b01aeb3SStefan Hajnoczi EXPORT_SYMBOL_GPL(vsock_core_get_transport); 23620b01aeb3SStefan Hajnoczi 2363c0cfa2d8SStefano Garzarella int vsock_core_register(const struct vsock_transport *t, int features) 236405e489b1SStefan Hajnoczi { 23650e121905SStefano Garzarella const struct vsock_transport *t_h2g, *t_g2h, *t_dgram, *t_local; 2366c0cfa2d8SStefano Garzarella int err = mutex_lock_interruptible(&vsock_register_mutex); 2367c0cfa2d8SStefano Garzarella 2368c0cfa2d8SStefano Garzarella if (err) 2369c0cfa2d8SStefano Garzarella return err; 2370c0cfa2d8SStefano Garzarella 2371c0cfa2d8SStefano Garzarella t_h2g = transport_h2g; 2372c0cfa2d8SStefano Garzarella t_g2h = transport_g2h; 2373c0cfa2d8SStefano Garzarella t_dgram = transport_dgram; 23740e121905SStefano Garzarella t_local = transport_local; 2375c0cfa2d8SStefano Garzarella 2376c0cfa2d8SStefano Garzarella if (features & VSOCK_TRANSPORT_F_H2G) { 2377c0cfa2d8SStefano Garzarella if (t_h2g) { 2378c0cfa2d8SStefano Garzarella err = -EBUSY; 2379c0cfa2d8SStefano Garzarella goto err_busy; 2380c0cfa2d8SStefano Garzarella } 2381c0cfa2d8SStefano Garzarella t_h2g = t; 238205e489b1SStefan Hajnoczi } 238305e489b1SStefan Hajnoczi 2384c0cfa2d8SStefano Garzarella if (features & VSOCK_TRANSPORT_F_G2H) { 2385c0cfa2d8SStefano Garzarella if (t_g2h) { 2386c0cfa2d8SStefano Garzarella err = -EBUSY; 2387c0cfa2d8SStefano Garzarella goto err_busy; 2388c0cfa2d8SStefano Garzarella } 2389c0cfa2d8SStefano Garzarella t_g2h = t; 2390c0cfa2d8SStefano Garzarella } 2391c0cfa2d8SStefano Garzarella 2392c0cfa2d8SStefano Garzarella if (features & VSOCK_TRANSPORT_F_DGRAM) { 2393c0cfa2d8SStefano Garzarella if (t_dgram) { 2394c0cfa2d8SStefano Garzarella err = -EBUSY; 2395c0cfa2d8SStefano Garzarella goto err_busy; 2396c0cfa2d8SStefano Garzarella } 2397c0cfa2d8SStefano Garzarella t_dgram = t; 2398c0cfa2d8SStefano Garzarella } 2399c0cfa2d8SStefano Garzarella 24000e121905SStefano Garzarella if (features & VSOCK_TRANSPORT_F_LOCAL) { 24010e121905SStefano Garzarella if (t_local) { 24020e121905SStefano Garzarella err = -EBUSY; 24030e121905SStefano Garzarella goto err_busy; 24040e121905SStefano Garzarella } 24050e121905SStefano Garzarella t_local = t; 24060e121905SStefano Garzarella } 24070e121905SStefano Garzarella 2408c0cfa2d8SStefano Garzarella transport_h2g = t_h2g; 2409c0cfa2d8SStefano Garzarella transport_g2h = t_g2h; 2410c0cfa2d8SStefano Garzarella transport_dgram = t_dgram; 24110e121905SStefano Garzarella transport_local = t_local; 2412c0cfa2d8SStefano Garzarella 2413c0cfa2d8SStefano Garzarella err_busy: 2414c0cfa2d8SStefano Garzarella mutex_unlock(&vsock_register_mutex); 2415c0cfa2d8SStefano Garzarella return err; 2416c0cfa2d8SStefano Garzarella } 2417c0cfa2d8SStefano Garzarella EXPORT_SYMBOL_GPL(vsock_core_register); 2418c0cfa2d8SStefano Garzarella 2419c0cfa2d8SStefano Garzarella void vsock_core_unregister(const struct vsock_transport *t) 2420c0cfa2d8SStefano Garzarella { 2421c0cfa2d8SStefano Garzarella mutex_lock(&vsock_register_mutex); 2422c0cfa2d8SStefano Garzarella 2423c0cfa2d8SStefano Garzarella if (transport_h2g == t) 2424c0cfa2d8SStefano Garzarella transport_h2g = NULL; 2425c0cfa2d8SStefano Garzarella 2426c0cfa2d8SStefano Garzarella if (transport_g2h == t) 2427c0cfa2d8SStefano Garzarella transport_g2h = NULL; 2428c0cfa2d8SStefano Garzarella 2429c0cfa2d8SStefano Garzarella if (transport_dgram == t) 2430c0cfa2d8SStefano Garzarella transport_dgram = NULL; 2431c0cfa2d8SStefano Garzarella 24320e121905SStefano Garzarella if (transport_local == t) 24330e121905SStefano Garzarella transport_local = NULL; 24340e121905SStefano Garzarella 2435c0cfa2d8SStefano Garzarella mutex_unlock(&vsock_register_mutex); 2436c0cfa2d8SStefano Garzarella } 2437c0cfa2d8SStefano Garzarella EXPORT_SYMBOL_GPL(vsock_core_unregister); 2438c0cfa2d8SStefano Garzarella 2439c0cfa2d8SStefano Garzarella module_init(vsock_init); 244005e489b1SStefan Hajnoczi module_exit(vsock_exit); 2441c1eef220SCong Wang 2442d021c344SAndy King MODULE_AUTHOR("VMware, Inc."); 2443d021c344SAndy King MODULE_DESCRIPTION("VMware Virtual Socket Family"); 24441190cfdbSJorgen Hansen MODULE_VERSION("1.0.2.0-k"); 2445d021c344SAndy King MODULE_LICENSE("GPL v2"); 2446