diff options
| -rw-r--r-- | include/linux/socket.h | 4 | ||||
| -rw-r--r-- | include/uapi/linux/vm_sockets.h | 171 | ||||
| -rw-r--r-- | net/Kconfig | 1 | ||||
| -rw-r--r-- | net/Makefile | 1 | ||||
| -rw-r--r-- | net/vmw_vsock/Kconfig | 28 | ||||
| -rw-r--r-- | net/vmw_vsock/Makefile | 7 | ||||
| -rw-r--r-- | net/vmw_vsock/af_vsock.c | 2015 | ||||
| -rw-r--r-- | net/vmw_vsock/af_vsock.h | 175 | ||||
| -rw-r--r-- | net/vmw_vsock/vmci_transport.c | 2157 | ||||
| -rw-r--r-- | net/vmw_vsock/vmci_transport.h | 139 | ||||
| -rw-r--r-- | net/vmw_vsock/vmci_transport_notify.c | 680 | ||||
| -rw-r--r-- | net/vmw_vsock/vmci_transport_notify.h | 83 | ||||
| -rw-r--r-- | net/vmw_vsock/vmci_transport_notify_qstate.c | 438 | ||||
| -rw-r--r-- | net/vmw_vsock/vsock_addr.c | 86 | ||||
| -rw-r--r-- | net/vmw_vsock/vsock_addr.h | 32 | ||||
| -rw-r--r-- | net/vmw_vsock/vsock_version.h | 22 |
16 files changed, 6038 insertions, 1 deletions
diff --git a/include/linux/socket.h b/include/linux/socket.h index 9a546ff..2b9f74b 100644 --- a/include/linux/socket.h +++ b/include/linux/socket.h @@ -178,7 +178,8 @@ struct ucred { #define AF_CAIF 37 /* CAIF sockets */ #define AF_ALG 38 /* Algorithm sockets */ #define AF_NFC 39 /* NFC sockets */ -#define AF_MAX 40 /* For now.. */ +#define AF_VSOCK 40 /* vSockets */ +#define AF_MAX 41 /* For now.. */ /* Protocol families, same as address families. */ #define PF_UNSPEC AF_UNSPEC @@ -221,6 +222,7 @@ struct ucred { #define PF_CAIF AF_CAIF #define PF_ALG AF_ALG #define PF_NFC AF_NFC +#define PF_VSOCK AF_VSOCK #define PF_MAX AF_MAX /* Maximum queue length specifiable by listen. */ diff --git a/include/uapi/linux/vm_sockets.h b/include/uapi/linux/vm_sockets.h new file mode 100644 index 0000000..f7f2e99 --- /dev/null +++ b/include/uapi/linux/vm_sockets.h @@ -0,0 +1,171 @@ +/* + * VMware vSockets Driver + * + * Copyright (C) 2007-2013 VMware, Inc. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation version 2 and no later version. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + */ + +#ifndef _VM_SOCKETS_H_ +#define _VM_SOCKETS_H_ + +#if !defined(__KERNEL__) +#include <sys/socket.h> +#endif + +/* Option name for STREAM socket buffer size. Use as the option name in + * setsockopt(3) or getsockopt(3) to set or get an unsigned long long that + * specifies the size of the buffer underlying a vSockets STREAM socket. + * Value is clamped to the MIN and MAX. + */ + +#define SO_VM_SOCKETS_BUFFER_SIZE 0 + +/* Option name for STREAM socket minimum buffer size. Use as the option name + * in setsockopt(3) or getsockopt(3) to set or get an unsigned long long that + * specifies the minimum size allowed for the buffer underlying a vSockets + * STREAM socket. + */ + +#define SO_VM_SOCKETS_BUFFER_MIN_SIZE 1 + +/* Option name for STREAM socket maximum buffer size. Use as the option name + * in setsockopt(3) or getsockopt(3) to set or get an unsigned long long + * that specifies the maximum size allowed for the buffer underlying a + * vSockets STREAM socket. + */ + +#define SO_VM_SOCKETS_BUFFER_MAX_SIZE 2 + +/* Option name for socket peer's host-specific VM ID. Use as the option name + * in getsockopt(3) to get a host-specific identifier for the peer endpoint's + * VM. The identifier is a signed integer. + * Only available for hypervisor endpoints. + */ + +#define SO_VM_SOCKETS_PEER_HOST_VM_ID 3 + +/* Option name for socket's service label. Use as the option name in + * setsockopt(3) or getsockopt(3) to set or get the service label for a socket. + * The service label is a C-style NUL-terminated string. Only available for + * hypervisor endpoints. + */ + +#define SO_VM_SOCKETS_SERVICE_LABEL 4 + +/* Option name for determining if a socket is trusted. Use as the option name + * in getsockopt(3) to determine if a socket is trusted. The value is a + * signed integer. + */ + +#define SO_VM_SOCKETS_TRUSTED 5 + +/* Option name for STREAM socket connection timeout. Use as the option name + * in setsockopt(3) or getsockopt(3) to set or get the connection + * timeout for a STREAM socket. + */ + +#define SO_VM_SOCKETS_CONNECT_TIMEOUT 6 + +/* Option name for using non-blocking send/receive. Use as the option name + * for setsockopt(3) or getsockopt(3) to set or get the non-blocking + * transmit/receive flag for a STREAM socket. This flag determines whether + * send() and recv() can be called in non-blocking contexts for the given + * socket. The value is a signed integer. + * + * This option is only relevant to kernel endpoints, where descheduling the + * thread of execution is not allowed, for example, while holding a spinlock. + * It is not to be confused with conventional non-blocking socket operations. + * + * Only available for hypervisor endpoints. + */ + +#define SO_VM_SOCKETS_NONBLOCK_TXRX 7 + +/* The vSocket equivalent of INADDR_ANY. This works for the svm_cid field of + * sockaddr_vm and indicates the context ID of the current endpoint. + */ + +#define VMADDR_CID_ANY -1U + +/* Bind to any available port. Works for the svm_port field of + * sockaddr_vm. + */ + +#define VMADDR_PORT_ANY -1U + +/* Use this as the destination CID in an address when referring to the + * hypervisor. VMCI relies on it being 0, but this would be useful for other + * transports too. + */ + +#define VMADDR_CID_HYPERVISOR 0 + +/* This CID is specific to VMCI and can be considered reserved (even VMCI + * doesn't use it anymore, it's a legacy value from an older release). + */ + +#define VMADDR_CID_RESERVED 1 + +/* Use this as the destination CID in an address when referring to the host + * (any process other than the hypervisor). VMCI relies on it being 2, but + * this would be useful for other transports too. + */ + +#define VMADDR_CID_HOST 2 + +/* Invalid vSockets version. */ + +#define VM_SOCKETS_INVALID_VERSION -1U + +/* The epoch (first) component of the vSockets version. A single byte + * representing the epoch component of the vSockets version. + */ + +#define VM_SOCKETS_VERSION_EPOCH(_v) (((_v) & 0xFF000000) >> 24) + +/* The major (second) component of the vSockets version. A single byte + * representing the major component of the vSockets version. Typically + * changes for every major release of a product. + */ + +#define VM_SOCKETS_VERSION_MAJOR(_v) (((_v) & 0x00FF0000) >> 16) + +/* The minor (third) component of the vSockets version. Two bytes representing + * the minor component of the vSockets version. + */ + +#define VM_SOCKETS_VERSION_MINOR(_v) (((_v) & 0x0000FFFF)) + +/* Address structure for vSockets. The address family should be set to + * whatever vmci_sock_get_af_value_fd() returns. The structure members should + * all align on their natural boundaries without resorting to compiler packing + * directives. The total size of this structure should be exactly the same as + * that of struct sockaddr. + */ + +struct sockaddr_vm { + sa_family_t svm_family; + unsigned short svm_reserved1; + unsigned int svm_port; + unsigned int svm_cid; + unsigned char svm_zero[sizeof(struct sockaddr) - + sizeof(sa_family_t) - + sizeof(unsigned short) - + sizeof(unsigned int) - sizeof(unsigned int)]; +}; + +#define IOCTL_VM_SOCKETS_GET_LOCAL_CID _IO(7, 0xb9) + +#if defined(__KERNEL__) +int vm_sockets_get_local_cid(void); +#endif + +#endif diff --git a/net/Kconfig b/net/Kconfig index c31348e..5a1888b 100644 --- a/net/Kconfig +++ b/net/Kconfig @@ -217,6 +217,7 @@ source "net/dcb/Kconfig" source "net/dns_resolver/Kconfig" source "net/batman-adv/Kconfig" source "net/openvswitch/Kconfig" +source "net/vmw_vsock/Kconfig" config RPS boolean diff --git a/net/Makefile b/net/Makefile index c5aa8b3..091e7b04 100644 --- a/net/Makefile +++ b/net/Makefile @@ -69,3 +69,4 @@ obj-$(CONFIG_CEPH_LIB) += ceph/ obj-$(CONFIG_BATMAN_ADV) += batman-adv/ obj-$(CONFIG_NFC) += nfc/ obj-$(CONFIG_OPENVSWITCH) += openvswitch/ +obj-$(CONFIG_VSOCKETS) += vmw_vsock/ diff --git a/net/vmw_vsock/Kconfig b/net/vmw_vsock/Kconfig new file mode 100644 index 0000000..b5fa7e4 --- /dev/null +++ b/net/vmw_vsock/Kconfig @@ -0,0 +1,28 @@ +# +# Vsock protocol +# + +config VSOCKETS + tristate "Virtual Socket protocol" + help + Virtual Socket Protocol is a socket protocol similar to TCP/IP + allowing comunication between Virtual Machines and hypervisor + or host. + + You should also select one or more hypervisor-specific transports + below. + + To compile this driver as a module, choose M here: the module + will be called vsock. If unsure, say N. + +config VMWARE_VMCI_VSOCKETS + tristate "VMware VMCI transport for Virtual Sockets" + depends on VSOCKETS && VMWARE_VMCI + help + This module implements a VMCI transport for Virtual Sockets. + + Enable this transport if your Virtual Machine runs on a VMware + hypervisor. + + To compile this driver as a module, choose M here: the module + will be called vmw_vsock_vmci_transport. If unsure, say N. diff --git a/net/vmw_vsock/Makefile b/net/vmw_vsock/Makefile new file mode 100644 index 0000000..2ce52d7 --- /dev/null +++ b/net/vmw_vsock/Makefile @@ -0,0 +1,7 @@ +obj-$(CONFIG_VSOCKETS) += vsock.o +obj-$(CONFIG_VMWARE_VMCI_VSOCKETS) += vmw_vsock_vmci_transport.o + +vsock-y += af_vsock.o vsock_addr.o + +vmw_vsock_vmci_transport-y += vmci_transport.o vmci_transport_notify.o \ + vmci_transport_notify_qstate.o diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c new file mode 100644 index 0000000..54bb7bd --- /dev/null +++ b/net/vmw_vsock/af_vsock.c @@ -0,0 +1,2015 @@ +/* + * VMware vSockets Driver + * + * Copyright (C) 2007-2013 VMware, Inc. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation version 2 and no later version. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + */ + +/* Implementation notes: + * + * - There are two kinds of sockets: those created by user action (such as + * calling socket(2)) and those created by incoming connection request packets. + * + * - There are two "global" tables, one for bound sockets (sockets that have + * specified an address that they are responsible for) and one for connected + * sockets (sockets that have established a connection with another socket). + * These tables are "global" in that all sockets on the system are placed + * within them. - Note, though, that the bound table contains an extra entry + * for a list of unbound sockets and SOCK_DGRAM sockets will always remain in + * that list. The bound table is used solely for lookup of sockets when packets + * are received and that's not necessary for SOCK_DGRAM sockets since we create + * a datagram handle for each and need not perform a lookup. Keeping SOCK_DGRAM + * sockets out of the bound hash buckets will reduce the chance of collisions + * when looking for SOCK_STREAM sockets and prevents us from having to check the + * socket type in the hash table lookups. + * + * - Sockets created by user action will either be "client" sockets that + * initiate a connection or "server" sockets that listen for connections; we do + * not support simultaneous connects (two "client" sockets connecting). + * + * - "Server" sockets are referred to as listener sockets throughout this + * implementation because they are in the SS_LISTEN state. When a connection + * request is received (the second kind of socket mentioned above), we create a + * new socket and refer to it as a pending socket. These pending sockets are + * placed on the pending connection list of the listener socket. When future + * packets are received for the address the listener socket is bound to, we + * check if the source of the packet is from one that has an existing pending + * connection. If it does, we process the packet for the pending socket. When + * that socket reaches the connected state, it is removed from the listener + * socket's pending list and enqueued in the listener socket's accept queue. + * Callers of accept(2) will accept connected sockets from the listener socket's + * accept queue. If the socket cannot be accepted for some reason then it is + * marked rejected. Once the connection is accepted, it is owned by the user + * process and the responsibility for cleanup falls with that user process. + * + * - It is possible that these pending sockets will never reach the connected + * state; in fact, we may never receive another packet after the connection + * request. Because of this, we must schedule a cleanup function to run in the + * future, after some amount of time passes where a connection should have been + * established. This function ensures that the socket is off all lists so it + * cannot be retrieved, then drops all references to the socket so it is cleaned + * up (sock_put() -> sk_free() -> our sk_destruct implementation). Note this + * function will also cleanup rejected sockets, those that reach the connected + * state but leave it before they have been accepted. + * + * - Sockets created by user action will be cleaned up when the user process + * calls close(2), causing our release implementation to be called. Our release + * implementation will perform some cleanup then drop the last reference so our + * sk_destruct implementation is invoked. Our sk_destruct implementation will + * perform additional cleanup that's common for both types of sockets. + * + * - A socket's reference count is what ensures that the structure won't be + * freed. Each entry in a list (such as the "global" bound and connected tables + * and the listener socket's pending list and connected queue) ensures a + * reference. When we defer work until process context and pass a socket as our + * argument, we must ensure the reference count is increased to ensure the + * socket isn't freed before the function is run; the deferred function will + * then drop the reference. + */ + +#include <linux/types.h> + +#define EXPORT_SYMTAB +#include <linux/bitops.h> +#include <linux/cred.h> +#include <linux/init.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/kmod.h> +#include <linux/list.h> +#include <linux/miscdevice.h> +#include <linux/module.h> +#include <linux/mutex.h> +#include <linux/net.h> +#include <linux/poll.h> +#include <linux/skbuff.h> +#include <linux/smp.h> +#include <linux/socket.h> +#include <linux/stddef.h> +#include <linux/unistd.h> +#include <linux/wait.h> +#include <linux/workqueue.h> +#include <net/sock.h> + +#include "af_vsock.h" +#include "vsock_version.h" + +static int __vsock_bind(struct sock *sk, struct sockaddr_vm *addr); +static void vsock_sk_destruct(struct sock *sk); +static int vsock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb); + +/* Protocol family. */ +static struct proto vsock_proto = { + .name = "AF_VSOCK", + .owner = THIS_MODULE, + .obj_size = sizeof(struct vsock_sock), +}; + +/* The default peer timeout indicates how long we will wait for a peer response + * to a control message. + */ +#define VSOCK_DEFAULT_CONNECT_TIMEOUT (2 * HZ) + +#define SS_LISTEN 255 + +static const struct vsock_transport *transport; +static DEFINE_MUTEX(vsock_register_mutex); + +/**** EXPORTS ****/ + +/* Get the ID of the local context. This is transport dependent. */ + +int vm_sockets_get_local_cid(void) +{ + return transport->get_local_cid(); +} +EXPORT_SYMBOL_GPL(vm_sockets_get_local_cid); + +/**** UTILS ****/ + +/* Each bound VSocket is stored in the bind hash table and each connected + * VSocket is stored in the connected hash table. + * + * Unbound sockets are all put on the same list attached to the end of the hash + * table (vsock_unbound_sockets). Bound sockets are added to the hash table in + * the bucket that their local address hashes to (vsock_bound_sockets(addr) + * represents the list that addr hashes to). + * + * Specifically, we initialize the vsock_bind_table array to a size of + * VSOCK_HASH_SIZE + 1 so that vsock_bind_table[0] through + * vsock_bind_table[VSOCK_HASH_SIZE - 1] are for bound sockets and + * vsock_bind_table[VSOCK_HASH_SIZE] is for unbound sockets. The hash function + * mods with VSOCK_HASH_SIZE - 1 to ensure this. + */ +#define VSOCK_HASH_SIZE 251 +#define MAX_PORT_RETRIES 24 + +#define VSOCK_HASH(addr) ((addr)->svm_port % (VSOCK_HASH_SIZE - 1)) +#define vsock_bound_sockets(addr) (&vsock_bind_table[VSOCK_HASH(addr)]) +#define vsock_unbound_sockets (&vsock_bind_table[VSOCK_HASH_SIZE]) + +/* XXX This can probably be implemented in a better way. */ +#define VSOCK_CONN_HASH(src, dst) \ + (((src)->svm_cid ^ (dst)->svm_port) % (VSOCK_HASH_SIZE - 1)) +#define vsock_connected_sockets(src, dst) \ + (&vsock_connected_table[VSOCK_CONN_HASH(src, dst)]) +#define vsock_connected_sockets_vsk(vsk) \ + vsock_connected_sockets(&(vsk)->remote_addr, &(vsk)->local_addr) + +static struct list_head vsock_bind_table[VSOCK_HASH_SIZE + 1]; +static struct list_head vsock_connected_table[VSOCK_HASH_SIZE]; +static DEFINE_SPINLOCK(vsock_table_lock); + +static __init void vsock_init_tables(void) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(vsock_bind_table); i++) + INIT_LIST_HEAD(&vsock_bind_table[i]); + + for (i = 0; i < ARRAY_SIZE(vsock_connected_table); i++) + INIT_LIST_HEAD(&vsock_connected_table[i]); +} + +static void __vsock_insert_bound(struct list_head *list, + struct vsock_sock *vsk) +{ + sock_hold(&vsk->sk); + list_add(&vsk->bound_table, list); +} + +static void __vsock_insert_connected(struct list_head *list, + struct vsock_sock *vsk) +{ + sock_hold(&vsk->sk); + list_add(&vsk->connected_table, list); +} + +static void __vsock_remove_bound(struct vsock_sock *vsk) +{ + list_del_init(&vsk->bound_table); + sock_put(&vsk->sk); +} + +static void __vsock_remove_connected(struct vsock_sock *vsk) +{ + list_del_init(&vsk->connected_table); + sock_put(&vsk->sk); +} + +static struct sock *__vsock_find_bound_socket(struct sockaddr_vm *addr) +{ + struct vsock_sock *vsk; + + list_for_each_entry(vsk, vsock_bound_sockets(addr), bound_table) + if (vsock_addr_equals_addr_any(addr, &vsk->local_addr)) + return sk_vsock(vsk); + + return NULL; +} + +static struct sock *__vsock_find_connected_socket(struct sockaddr_vm *src, + struct sockaddr_vm *dst) +{ + struct vsock_sock *vsk; + + list_for_each_entry(vsk, vsock_connected_sockets(src, dst), + connected_table) { + if (vsock_addr_equals_addr(src, &vsk->remote_addr) + && vsock_addr_equals_addr(dst, &vsk->local_addr)) { + return sk_vsock(vsk); + } + } + + return NULL; +} + +static bool __vsock_in_bound_table(struct vsock_sock *vsk) +{ + return !list_empty(&vsk->bound_table); +} + +static bool __vsock_in_connected_table(struct vsock_sock *vsk) +{ + return !list_empty(&vsk->connected_table); +} + +static void vsock_insert_unbound(struct vsock_sock *vsk) +{ + spin_lock_bh(&vsock_table_lock); + __vsock_insert_bound(vsock_unbound_sockets, vsk); + spin_unlock_bh(&vsock_table_lock); +} + +void vsock_insert_connected(struct vsock_sock *vsk) +{ + struct list_head *list = vsock_connected_sockets( + &vsk->remote_addr, &vsk->local_addr); + + spin_lock_bh(&vsock_table_lock); + __vsock_insert_connected(list, vsk); + spin_unlock_bh(&vsock_table_lock); +} +EXPORT_SYMBOL_GPL(vsock_insert_connected); + +void vsock_remove_bound(struct vsock_sock *vsk) +{ + spin_lock_bh(&vsock_table_lock); + __vsock_remove_bound(vsk); + spin_unlock_bh(&vsock_table_lock); +} +EXPORT_SYMBOL_GPL(vsock_remove_bound); + +void vsock_remove_connected(struct vsock_sock *vsk) +{ + spin_lock_bh(&vsock_table_lock); + __vsock_remove_connected(vsk); + spin_unlock_bh(&vsock_table_lock); +} +EXPORT_SYMBOL_GPL(vsock_remove_connected); + +struct sock *vsock_find_bound_socket(struct sockaddr_vm *addr) +{ + struct sock *sk; + + spin_lock_bh(&vsock_table_lock); + sk = __vsock_find_bound_socket(addr); + if (sk) + sock_hold(sk); + + spin_unlock_bh(&vsock_table_lock); + + return sk; +} +EXPORT_SYMBOL_GPL(vsock_find_bound_socket); + +struct sock *vsock_find_connected_socket(struct sockaddr_vm *src, + struct sockaddr_vm *dst) +{ + struct sock *sk; + + spin_lock_bh(&vsock_table_lock); + sk = __vsock_find_connected_socket(src, dst); + if (sk) + sock_hold(sk); + + spin_unlock_bh(&vsock_table_lock); + + return sk; +} +EXPORT_SYMBOL_GPL(vsock_find_connected_socket); + +static bool vsock_in_bound_table(struct vsock_sock *vsk) +{ + bool ret; + + spin_lock_bh(&vsock_table_lock); + ret = __vsock_in_bound_table(vsk); + spin_unlock_bh(&vsock_table_lock); + + return ret; +} + +static bool vsock_in_connected_table(struct vsock_sock *vsk) +{ + bool ret; + + spin_lock_bh(&vsock_table_lock); + ret = __vsock_in_connected_table(vsk); + spin_unlock_bh(&vsock_table_lock); + + return ret; +} + +void vsock_for_each_connected_socket(void (*fn)(struct sock *sk)) +{ + int i; + + spin_lock_bh(&vsock_table_lock); + + for (i = 0; i < ARRAY_SIZE(vsock_connected_table); i++) { + struct vsock_sock *vsk; + list_for_each_entry(vsk, &vsock_connected_table[i], + connected_table); + fn(sk_vsock(vsk)); + } + + spin_unlock_bh(&vsock_table_lock); +} +EXPORT_SYMBOL_GPL(vsock_for_each_connected_socket); + +void vsock_add_pending(struct sock *listener, struct sock *pending) +{ + struct vsock_sock *vlistener; + struct vsock_sock *vpending; + + vlistener = vsock_sk(listener); + vpending = vsock_sk(pending); + + sock_hold(pending); + sock_hold(listener); + list_add_tail(&vpending->pending_links, &vlistener->pending_links); +} +EXPORT_SYMBOL_GPL(vsock_add_pending); + +void vsock_remove_pending(struct sock *listener, struct sock *pending) +{ + struct vsock_sock *vpending = vsock_sk(pending); + + list_del_init(&vpending->pending_links); + sock_put(listener); + sock_put(pending); +} +EXPORT_SYMBOL_GPL(vsock_remove_pending); + +void vsock_enqueue_accept(struct sock *listener, struct sock *connected) +{ + struct vsock_sock *vlistener; + struct vsock_sock *vconnected; + + vlistener = vsock_sk(listener); + vconnected = vsock_sk(connected); + + sock_hold(connected); + sock_hold(listener); + list_add_tail(&vconnected->accept_queue, &vlistener->accept_queue); +} +EXPORT_SYMBOL_GPL(vsock_enqueue_accept); + +static struct sock *vsock_dequeue_accept(struct sock *listener) +{ + struct vsock_sock *vlistener; + struct vsock_sock *vconnected; + + vlistener = vsock_sk(listener); + + if (list_empty(&vlistener->accept_queue)) + return NULL; + + vconnected = list_entry(vlistener->accept_queue.next, + struct vsock_sock, accept_queue); + + list_del_init(&vconnected->accept_queue); + sock_put(listener); + /* The caller will need a reference on the connected socket so we let + * it call sock_put(). + */ + + return sk_vsock(vconnected); +} + +static bool vsock_is_accept_queue_empty(struct sock *sk) +{ + struct vsock_sock *vsk = vsock_sk(sk); + return list_empty(&vsk->accept_queue); +} + +static bool vsock_is_pending(struct sock *sk) +{ + struct vsock_sock *vsk = vsock_sk(sk); + return !list_empty(&vsk->pending_links); +} + +static int vsock_send_shutdown(struct sock *sk, int mode) +{ + return transport->shutdown(vsock_sk(sk), mode); +} + +void vsock_pending_work(struct work_struct *work) +{ + struct sock *sk; + struct sock *listener; + struct vsock_sock *vsk; + bool cleanup; + + vsk = container_of(work, struct vsock_sock, dwork.work); + sk = sk_vsock(vsk); + listener = vsk->listener; + cleanup = true; + + lock_sock(listener); + lock_sock(sk); + + if (vsock_is_pending(sk)) { + vsock_remove_pending(listener, sk); + } else if (!vsk->rejected) { + /* We are not on the pending list and accept() did not reject + * us, so we must have been accepted by our user process. We + * just need to drop our references to the sockets and be on + * our way. + */ + cleanup = false; + goto out; + } + + listener->sk_ack_backlog--; + + /* We need to remove ourself from the global connected sockets list so + * incoming packets can't find this socket, and to reduce the reference + * count. + */ + if (vsock_in_connected_table(vsk)) + vsock_remove_connected(vsk); + + sk->sk_state = SS_FREE; + +out: + release_sock(sk); + release_sock(listener); + if (cleanup) + sock_put(sk); + + sock_put(sk); + sock_put(listener); +} +EXPORT_SYMBOL_GPL(vsock_pending_work); + +/**** SOCKET OPERATIONS ****/ + +static int __vsock_bind_stream(struct vsock_sock *vsk, + struct sockaddr_vm *addr) +{ + static u32 port = LAST_RESERVED_PORT + 1; + struct sockaddr_vm new_addr; + + vsock_addr_init(&new_addr, addr->svm_cid, addr->svm_port); + + if (addr->svm_port == VMADDR_PORT_ANY) { + bool found = false; + unsigned int i; + + for (i = 0; i < MAX_PORT_RETRIES; i++) { + if (port <= LAST_RESERVED_PORT) + port = LAST_RESERVED_PORT + 1; + + new_addr.svm_port = port++; + + if (!__vsock_find_bound_socket(&new_addr)) { + found = true; + break; + } + } + + if (!found) + return -EADDRNOTAVAIL; + } else { + /* If port is in reserved range, ensure caller + * has necessary privileges. + */ + if (addr->svm_port <= LAST_RESERVED_PORT && + !capable(CAP_NET_BIND_SERVICE)) { + return -EACCES; + } + + if (__vsock_find_bound_socket(&new_addr)) + return -EADDRINUSE; + } + + vsock_addr_init(&vsk->local_addr, new_addr.svm_cid, new_addr.svm_port); + + /* Remove stream sockets from the unbound list and add them to the hash + * table for easy lookup by its address. The unbound list is simply an + * extra entry at the end of the hash table, a trick used by AF_UNIX. + */ + __vsock_remove_bound(vsk); + __vsock_insert_bound(vsock_bound_sockets(&vsk->local_addr), vsk); + + return 0; +} + +static int __vsock_bind_dgram(struct vsock_sock *vsk, + struct sockaddr_vm *addr) +{ + return transport->dgram_bind(vsk, addr); +} + +static int __vsock_bind(struct sock *sk, struct sockaddr_vm *addr) +{ + struct vsock_sock *vsk = vsock_sk(sk); + u32 cid; + int retval; + + /* First ensure this socket isn't already bound. */ + if (vsock_addr_bound(&vsk->local_addr)) + return -EINVAL; + + /* Now bind to the provided address or select appropriate values if + * none are provided (VMADDR_CID_ANY and VMADDR_PORT_ANY). Note that + * like AF_INET prevents binding to a non-local IP address (in most + * cases), we only allow binding to the local CID. + */ + cid = transport->get_local_cid(); + if (addr->svm_cid != cid && addr->svm_cid != VMADDR_CID_ANY) + return -EADDRNOTAVAIL; + + switch (sk->sk_socket->type) { + case SOCK_STREAM: + spin_lock_bh(&vsock_table_lock); + retval = __vsock_bind_stream(vsk, addr); + spin_unlock_bh(&vsock_table_lock); + break; + + case SOCK_DGRAM: + retval = __vsock_bind_dgram(vsk, addr); + break; + + default: + retval = -EINVAL; + break; + } + + return retval; +} + +struct sock *__vsock_create(struct net *net, + struct socket *sock, + struct sock *parent, + gfp_t priority, + unsigned short type) +{ + struct sock *sk; + struct vsock_sock *psk; + struct vsock_sock *vsk; + + sk = sk_alloc(net, AF_VSOCK, priority, &vsock_proto); + if (!sk) + return NULL; + + sock_init_data(sock, sk); + + /* sk->sk_type is normally set in sock_init_data, but only if sock is + * non-NULL. We make sure that our sockets always have a type by + * setting it here if needed. + */ + if (!sock) + sk->sk_type = type; + + vsk = vsock_sk(sk); + vsock_addr_init(&vsk->local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); + vsock_addr_init(&vsk->remote_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); + + sk->sk_destruct = vsock_sk_destruct; + sk->sk_backlog_rcv = vsock_queue_rcv_skb; + sk->sk_state = 0; + sock_reset_flag(sk, SOCK_DONE); + + INIT_LIST_HEAD(&vsk->bound_table); + INIT_LIST_HEAD(&vsk->connected_table); + vsk->listener = NULL; + INIT_LIST_HEAD(&vsk->pending_links); + INIT_LIST_HEAD(&vsk->accept_queue); + vsk->rejected = false; + vsk->sent_request = false; + vsk->ignore_connecting_rst = false; + vsk->peer_shutdown = 0; + + psk = parent ? vsock_sk(parent) : NULL; + if (parent) { + vsk->trusted = psk->trusted; + vsk->owner = get_cred(psk->owner); + vsk->connect_timeout = psk->connect_timeout; + } else { + vsk->trusted = capable(CAP_NET_ADMIN); + vsk->owner = get_current_cred(); + vsk->connect_timeout = VSOCK_DEFAULT_CONNECT_TIMEOUT; + } + + if (transport->init(vsk, psk) < 0) { + sk_free(sk); + return NULL; + } + + if (sock) + vsock_insert_unbound(vsk); + + return sk; +} +EXPORT_SYMBOL_GPL(__vsock_create); + +static void __vsock_release(struct sock *sk) +{ + if (sk) { + struct sk_buff *skb; + struct sock *pending; + struct vsock_sock *vsk; + + vsk = vsock_sk(sk); + pending = NULL; /* Compiler warning. */ + + if (vsock_in_bound_table(vsk)) + vsock_remove_bound(vsk); + + if (vsock_in_connected_table(vsk)) + vsock_remove_connected(vsk); + + transport->release(vsk); + + lock_sock(sk); + sock_orphan(sk); + sk->sk_shutdown = SHUTDOWN_MASK; + + while ((skb = skb_dequeue(&sk->sk_receive_queue))) + kfree_skb(skb); + + /* Clean up any sockets that never were accepted. */ + while ((pending = vsock_dequeue_accept(sk)) != NULL) { + __vsock_release(pending); + sock_put(pending); + } + + release_sock(sk); + sock_put(sk); + } +} + +static void vsock_sk_destruct(struct sock *sk) +{ + struct vsock_sock *vsk = vsock_sk(sk); + + transport->destruct(vsk); + + /* When clearing these addresses, there's no need to set the family and + * possibly register the address family with the kernel. + */ + vsock_addr_init(&vsk->local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); + vsock_addr_init(&vsk->remote_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); + + put_cred(vsk->owner); +} + +static int vsock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) +{ + int err; + + err = sock_queue_rcv_skb(sk, skb); + if (err) + kfree_skb(skb); + + return err; +} + +s64 vsock_stream_has_data(struct vsock_sock *vsk) +{ + return transport->stream_has_data(vsk); +} +EXPORT_SYMBOL_GPL(vsock_stream_has_data); + +s64 vsock_stream_has_space(struct vsock_sock *vsk) +{ + return transport->stream_has_space(vsk); +} +EXPORT_SYMBOL_GPL(vsock_stream_has_space); + +static int vsock_release(struct socket *sock) +{ + __vsock_release(sock->sk); + sock->sk = NULL; + sock->state = SS_FREE; + + return 0; +} + +static int +vsock_bind(struct socket *sock, struct sockaddr *addr, int addr_len) +{ + int err; + struct sock *sk; + struct sockaddr_vm *vm_addr; + + sk = sock->sk; + + if (vsock_addr_cast(addr, addr_len, &vm_addr) != 0) + return -EINVAL; + + lock_sock(sk); + err = __vsock_bind(sk, vm_addr); + release_sock(sk); + + return err; +} + +static int vsock_getname(struct socket *sock, + struct sockaddr *addr, int *addr_len, int peer) +{ + int err; + struct sock *sk; + struct vsock_sock *vsk; + struct sockaddr_vm *vm_addr; + + sk = sock->sk; + vsk = vsock_sk(sk); + err = 0; + + lock_sock(sk); + + if (peer) { + if (sock->state != SS_CONNECTED) { + err = -ENOTCONN; + goto out; + } + vm_addr = &vsk->remote_addr; + } else { + vm_addr = &vsk->local_addr; + } + + if (!vm_addr) { + err = -EINVAL; + goto out; + } + + /* sys_getsockname() and sys_getpeername() pass us a + * MAX_SOCK_ADDR-sized buffer and don't set addr_len. Unfortunately + * that macro is defined in socket.c instead of .h, so we hardcode its + * value here. + */ + BUILD_BUG_ON(sizeof(*vm_addr) > 128); + memcpy(addr, vm_addr, sizeof(*vm_addr)); + *addr_len = sizeof(*vm_addr); + +out: + release_sock(sk); + return err; +} + +static int vsock_shutdown(struct socket *sock, int mode) +{ + int err; + struct sock *sk; + + /* User level uses SHUT_RD (0) and SHUT_WR (1), but the kernel uses + * RCV_SHUTDOWN (1) and SEND_SHUTDOWN (2), so we must increment mode + * here like the other address families do. Note also that the + * increment makes SHUT_RDWR (2) into RCV_SHUTDOWN | SEND_SHUTDOWN (3), + * which is what we want. + */ + mode++; + + if ((mode & ~SHUTDOWN_MASK) || !mode) + return -EINVAL; + + /* If this is a STREAM socket and it is not connected then bail out + * immediately. If it is a DGRAM socket then we must first kick the + * socket so that it wakes up from any sleeping calls, for example + * recv(), and then afterwards return the error. + */ + + sk = sock->sk; + if (sock->state == SS_UNCONNECTED) { + err = -ENOTCONN; + if (sk->sk_type == SOCK_STREAM) + return err; + } else { + sock->state = SS_DISCONNECTING; + err = 0; + } + + /* Receive and send shutdowns are treated alike. */ + mode = mode & (RCV_SHUTDOWN | SEND_SHUTDOWN); + if (mode) { + lock_sock(sk); + sk->sk_shutdown |= mode; + sk->sk_state_change(sk); + release_sock(sk); + + if (sk->sk_type == SOCK_STREAM) { + sock_reset_flag(sk, SOCK_DONE); + vsock_send_shutdown(sk, mode); + } + } + + return err; +} + +static unsigned int vsock_poll(struct file *file, struct socket *sock, + poll_table *wait) +{ + struct sock *sk; + unsigned int mask; + struct vsock_sock *vsk; + + sk = sock->sk; + vsk = vsock_sk(sk); + + poll_wait(file, sk_sleep(sk), wait); + mask = 0; + + if (sk->sk_err) + /* Signify that there has been an error on this socket. */ + mask |= POLLERR; + + /* INET sockets treat local write shutdown and peer write shutdown as a + * case of POLLHUP set. + */ + if ((sk->sk_shutdown == SHUTDOWN_MASK) || + ((sk->sk_shutdown & SEND_SHUTDOWN) && + (vsk->peer_shutdown & SEND_SHUTDOWN))) { + mask |= POLLHUP; + } + + if (sk->sk_shutdown & RCV_SHUTDOWN || + vsk->peer_shutdown & SEND_SHUTDOWN) { + mask |= POLLRDHUP; + } + + if (sock->type == SOCK_DGRAM) { + /* For datagram sockets we can read if there is something in + * the queue and write as long as the socket isn't shutdown for + * sending. + */ + if (!skb_queue_empty(&sk->sk_receive_queue) || + (sk->sk_shutdown & RCV_SHUTDOWN)) { + mask |= POLLIN | POLLRDNORM; + } + + if (!(sk->sk_shutdown & SEND_SHUTDOWN)) + mask |= POLLOUT | POLLWRNORM | POLLWRBAND; + + } else if (sock->type == SOCK_STREAM) { + lock_sock(sk); + + /* Listening sockets that have connections in their accept + * queue can be read. + */ + if (sk->sk_state == SS_LISTEN + && !vsock_is_accept_queue_empty(sk)) + mask |= POLLIN | POLLRDNORM; + + /* If there is something in the queue then we can read. */ + if (transport->stream_is_active(vsk) && + !(sk->sk_shutdown & RCV_SHUTDOWN)) { + bool data_ready_now = false; + int ret = transport->notify_poll_in( + vsk, 1, &data_ready_now); + if (ret < 0) { + mask |= POLLERR; + } else { + if (data_ready_now) + mask |= POLLIN | POLLRDNORM; + + } + } + + /* Sockets whose connections have been closed, reset, or + * terminated should also be considered read, and we check the + * shutdown flag for that. + */ + if (sk->sk_shutdown & RCV_SHUTDOWN || + vsk->peer_shutdown & SEND_SHUTDOWN) { + mask |= POLLIN | POLLRDNORM; + } + + /* Connected sockets that can produce data can be written. */ + if (sk->sk_state == SS_CONNECTED) { + if (!(sk->sk_shutdown & SEND_SHUTDOWN)) { + bool space_avail_now = false; + int ret = transport->notify_poll_out( + vsk, 1, &space_avail_now); + if (ret < 0) { + mask |= POLLERR; + } else { + if (space_avail_now) + /* Remove POLLWRBAND since INET + * sockets are not setting it. + */ + mask |= POLLOUT | POLLWRNORM; + + } + } + } + + /* Simulate INET socket poll behaviors, which sets + * POLLOUT|POLLWRNORM when peer is closed and nothing to read, + * but local send is not shutdown. + */ + if (sk->sk_state == SS_UNCONNECTED) { + if (!(sk->sk_shutdown & SEND_SHUTDOWN)) + mask |= POLLOUT | POLLWRNORM; + + } + + release_sock(sk); + } + + return mask; +} + +static int vsock_dgram_sendmsg(struct kiocb *kiocb, struct socket *sock, + struct msghdr *msg, size_t len) +{ + int err; + struct sock *sk; + struct vsock_sock *vsk; + struct sockaddr_vm *remote_addr; + + if (msg->msg_flags & MSG_OOB) + return -EOPNOTSUPP; + + /* For now, MSG_DONTWAIT is always assumed... */ + err = 0; + sk = sock->sk; + vsk = vsock_sk(sk); + + lock_sock(sk); + + if (!vsock_addr_bound(&vsk->local_addr)) { + struct sockaddr_vm local_addr; + + vsock_addr_init(&local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); + err = __vsock_bind(sk, &local_addr); + if (err != 0) + goto out; + + } + + /* If the provided message contains an address, use that. Otherwise + * fall back on the socket's remote handle (if it has been connected). + */ + if (msg->msg_name && + vsock_addr_cast(msg->msg_name, msg->msg_namelen, + &remote_addr) == 0) { + /* Ensure this address is of the right type and is a valid + * destination. + */ + + if (remote_addr->svm_cid == VMADDR_CID_ANY) + remote_addr->svm_cid = transport->get_local_cid(); + + if (!vsock_addr_bound(remote_addr)) { + err = -EINVAL; + goto out; + } + } else if (sock->state == SS_CONNECTED) { + remote_addr = &vsk->remote_addr; + + if (remote_addr->svm_cid == VMADDR_CID_ANY) + remote_addr->svm_cid = transport->get_local_cid(); + + /* XXX Should connect() or this function ensure remote_addr is + * bound? + */ + if (!vsock_addr_bound(&vsk->remote_addr)) { + err = -EINVAL; + goto out; + } + } else { + err = -EINVAL; + goto out; + } + + if (!transport->dgram_allow(remote_addr->svm_cid, + remote_addr->svm_port)) { + err = -EINVAL; + goto out; + } + + err = transport->dgram_enqueue(vsk, remote_addr, msg->msg_iov, len); + +out: + release_sock(sk); + return err; +} + +static int vsock_dgram_connect(struct socket *sock, + struct sockaddr *addr, int addr_len, int flags) +{ + int err; + struct sock *sk; + struct vsock_sock *vsk; + struct sockaddr_vm *remote_addr; + + sk = sock->sk; + vsk = vsock_sk(sk); + + err = vsock_addr_cast(addr, addr_len, &remote_addr); + if (err == -EAFNOSUPPORT && remote_addr->svm_family == AF_UNSPEC) { + lock_sock(sk); + vsock_addr_init(&vsk->remote_addr, VMADDR_CID_ANY, + VMADDR_PORT_ANY); + sock->state = SS_UNCONNECTED; + release_sock(sk); + return 0; + } else if (err != 0) + return -EINVAL; + + lock_sock(sk); + + if (!vsock_addr_bound(&vsk->local_addr)) { + struct sockaddr_vm local_addr; + + vsock_addr_init(&local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); + err = __vsock_bind(sk, &local_addr); + if (err != 0) + goto out; + + } + + if (!transport->dgram_allow(remote_addr->svm_cid, + remote_addr->svm_port)) { + err = -EINVAL; + goto out; + } + + memcpy(&vsk->remote_addr, remote_addr, sizeof(vsk->remote_addr)); + sock->state = SS_CONNECTED; + +out: + release_sock(sk); + return err; +} + +static int vsock_dgram_recvmsg(struct kiocb *kiocb, struct socket *sock, + struct msghdr *msg, size_t len, int flags) +{ + return transport->dgram_dequeue(kiocb, vsock_sk(sock->sk), msg, len, + flags); +} + +static const struct proto_ops vsock_dgram_ops = { + .family = PF_VSOCK, + .owner = THIS_MODULE, + .release = vsock_release, + .bind = vsock_bind, + .connect = vsock_dgram_connect, + .socketpair = sock_no_socketpair, + .accept = sock_no_accept, + .getname = vsock_getname, + .poll = vsock_poll, + .ioctl = sock_no_ioctl, + .listen = sock_no_listen, + .shutdown = vsock_shutdown, + .setsockopt = sock_no_setsockopt, + .getsockopt = sock_no_getsockopt, + .sendmsg = vsock_dgram_sendmsg, + .recvmsg = vsock_dgram_recvmsg, + .mmap = sock_no_mmap, + .sendpage = sock_no_sendpage, +}; + +static void vsock_connect_timeout(struct work_struct *work) +{ + struct sock *sk; + struct vsock_sock *vsk; + + vsk = container_of(work, struct vsock_sock, dwork.work); + sk = sk_vsock(vsk); + + lock_sock(sk); + if (sk->sk_state == SS_CONNECTING && + (sk->sk_shutdown != SHUTDOWN_MASK)) { + sk->sk_state = SS_UNCONNECTED; + sk->sk_err = ETIMEDOUT; + sk->sk_error_report(sk); + } + release_sock(sk); + + sock_put(sk); +} + +static int vsock_stream_connect(struct socket *sock, struct sockaddr *addr, + int addr_len, int flags) +{ + int err; + struct sock *sk; + struct vsock_sock *vsk; + struct sockaddr_vm *remote_addr; + long timeout; + DEFINE_WAIT(wait); + + err = 0; + sk = sock->sk; + vsk = vsock_sk(sk); + + lock_sock(sk); + + /* XXX AF_UNSPEC should make us disconnect like AF_INET. */ + switch (sock->state) { + case SS_CONNECTED: + err = -EISCONN; + goto out; + case SS_DISCONNECTING: + err = -EINVAL; + goto out; + case SS_CONNECTING: + /* This continues on so we can move sock into the SS_CONNECTED + * state once the connection has completed (at which point err + * will be set to zero also). Otherwise, we will either wait + * for the connection or return -EALREADY should this be a + * non-blocking call. + */ + err = -EALREADY; + break; + default: + if ((sk->sk_state == SS_LISTEN) || + vsock_addr_cast(addr, addr_len, &remote_addr) != 0) { + err = -EINVAL; + goto out; + } + + /* The hypervisor and well-known contexts do not have socket + * endpoints. + */ + if (!transport->stream_allow(remote_addr->svm_cid, + remote_addr->svm_port)) { + err = -ENETUNREACH; + goto out; + } + + /* Set the remote address that we are connecting to. */ + memcpy(&vsk->remote_addr, remote_addr, + sizeof(vsk->remote_addr)); + + /* Autobind this socket to the local address if necessary. */ + if (!vsock_addr_bound(&vsk->local_addr)) { + struct sockaddr_vm local_addr; + + vsock_addr_init(&local_addr, VMADDR_CID_ANY, + VMADDR_PORT_ANY); + err = __vsock_bind(sk, &local_addr); + if (err != 0) + goto out; + + } + + sk->sk_state = SS_CONNECTING; + + err = transport->connect(vsk); + if (err < 0) + goto out; + + /* Mark sock as connecting and set the error code to in + * progress in case this is a non-blocking connect. + */ + sock->state = SS_CONNECTING; + err = -EINPROGRESS; + } + + /* The receive path will handle all communication until we are able to + * enter the connected state. Here we wait for the connection to be + * completed or a notification of an error. + */ + timeout = vsk->connect_timeout; + prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); + + while (sk->sk_state != SS_CONNECTED && sk->sk_err == 0) { + if (flags & O_NONBLOCK) { + /* If we're not going to block, we schedule a timeout + * function to generate a timeout on the connection + * attempt, in case the peer doesn't respond in a + * timely manner. We hold on to the socket until the + * timeout fires. + */ + sock_hold(sk); + INIT_DELAYED_WORK(&vsk->dwork, + vsock_connect_timeout); + schedule_delayed_work(&vsk->dwork, timeout); + + /* Skip ahead to preserve error code set above. */ + goto out_wait; + } + + release_sock(sk); + timeout = schedule_timeout(timeout); + lock_sock(sk); + + if (signal_pending(current)) { + err = sock_intr_errno(timeout); + goto out_wait_error; + } else if (timeout == 0) { + err = -ETIMEDOUT; + goto out_wait_error; + } + + prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); + } + + if (sk->sk_err) { + err = -sk->sk_err; + goto out_wait_error; + } else + err = 0; + +out_wait: + finish_wait(sk_sleep(sk), &wait); +out: + release_sock(sk); + return err; + +out_wait_error: + sk->sk_state = SS_UNCONNECTED; + sock->state = SS_UNCONNECTED; + goto out_wait; +} + +static int vsock_accept(struct socket *sock, struct socket *newsock, int flags) +{ + struct sock *listener; + int err; + struct sock *connected; + struct vsock_sock *vconnected; + long timeout; + DEFINE_WAIT(wait); + + err = 0; + listener = sock->sk; + + lock_sock(listener); + + if (sock->type != SOCK_STREAM) { + err = -EOPNOTSUPP; + goto out; + } + + if (listener->sk_state != SS_LISTEN) { + err = -EINVAL; + goto out; + } + + /* Wait for children sockets to appear; these are the new sockets + * created upon connection establishment. + */ + timeout = sock_sndtimeo(listener, flags & O_NONBLOCK); + prepare_to_wait(sk_sleep(listener), &wait, TASK_INTERRUPTIBLE); + + while ((connected = vsock_dequeue_accept(listener)) == NULL && + listener->sk_err == 0) { + release_sock(listener); + timeout = schedule_timeout(timeout); + lock_sock(listener); + + if (signal_pending(current)) { + err = sock_intr_errno(timeout); + goto out_wait; + } else if (timeout == 0) { + err = -EAGAIN; + goto out_wait; + } + + prepare_to_wait(sk_sleep(listener), &wait, TASK_INTERRUPTIBLE); + } + + if (listener->sk_err) + err = -listener->sk_err; + + if (connected) { + listener->sk_ack_backlog--; + + lock_sock(connected); + vconnected = vsock_sk(connected); + + /* If the listener socket has received an error, then we should + * reject this socket and return. Note that we simply mark the + * socket rejected, drop our reference, and let the cleanup + * function handle the cleanup; the fact that we found it in + * the listener's accept queue guarantees that the cleanup + * function hasn't run yet. + */ + if (err) { + vconnected->rejected = true; + release_sock(connected); + sock_put(connected); + goto out_wait; + } + + newsock->state = SS_CONNECTED; + sock_graft(connected, newsock); + release_sock(connected); + sock_put(connected); + } + +out_wait: + finish_wait(sk_sleep(listener), &wait); +out: + release_sock(listener); + return err; +} + +static int vsock_listen(struct socket *sock, int backlog) +{ + int err; + struct sock *sk; + struct vsock_sock *vsk; + + sk = sock->sk; + + lock_sock(sk); + + if (sock->type != SOCK_STREAM) { + err = -EOPNOTSUPP; + goto out; + } + + if (sock->state != SS_UNCONNECTED) { + err = -EINVAL; + goto out; + } + + vsk = vsock_sk(sk); + + if (!vsock_addr_bound(&vsk->local_addr)) { + err = -EINVAL; + goto out; + } + + sk->sk_max_ack_backlog = backlog; + sk->sk_state = SS_LISTEN; + + err = 0; + +out: + release_sock(sk); + return err; +} + +static int vsock_stream_setsockopt(struct socket *sock, + int level, + int optname, + char __user *optval, + unsigned int optlen) +{ + int err; + struct sock *sk; + struct vsock_sock *vsk; + u64 val; + + if (level != AF_VSOCK) + return -ENOPROTOOPT; + +#define COPY_IN(_v) \ + do { \ + if (optlen < sizeof(_v)) { \ + err = -EINVAL; \ + goto exit; \ + } \ + if (copy_from_user(&_v, optval, sizeof(_v)) != 0) { \ + err = -EFAULT; \ + goto exit; \ + } \ + } while (0) + + err = 0; + sk = sock->sk; + vsk = vsock_sk(sk); + + lock_sock(sk); + + switch (optname) { + case SO_VM_SOCKETS_BUFFER_SIZE: + COPY_IN(val); + transport->set_buffer_size(vsk, val); + break; + + case SO_VM_SOCKETS_BUFFER_MAX_SIZE: + COPY_IN(val); + transport->set_max_buffer_size(vsk, val); + break; + + case SO_VM_SOCKETS_BUFFER_MIN_SIZE: + COPY_IN(val); + transport->set_min_buffer_size(vsk, val); + break; + + case SO_VM_SOCKETS_CONNECT_TIMEOUT: { + struct timeval tv; + COPY_IN(tv); + if (tv.tv_sec >= 0 && tv.tv_usec < USEC_PER_SEC && + tv.tv_sec < (MAX_SCHEDULE_TIMEOUT / HZ - 1)) { + vsk->connect_timeout = tv.tv_sec * HZ + + DIV_ROUND_UP(tv.tv_usec, (1000000 / HZ)); + if (vsk->connect_timeout == 0) + vsk->connect_timeout = + VSOCK_DEFAULT_CONNECT_TIMEOUT; + + } else { + err = -ERANGE; + } + break; + } + + default: + err = -ENOPROTOOPT; + break; + } + +#undef COPY_IN + +exit: + release_sock(sk); + return err; +} + +static int vsock_stream_getsockopt(struct socket *sock, + int level, int optname, + char __user *optval, + int __user *optlen) +{ + int err; + int len; + struct sock *sk; + struct vsock_sock *vsk; + u64 val; + + if (level != AF_VSOCK) + return -ENOPROTOOPT; + + err = get_user(len, optlen); + if (err != 0) + return err; + +#define COPY_OUT(_v) \ + do { \ + if (len < sizeof(_v)) \ + return -EINVAL; \ + \ + len = sizeof(_v); \ + if (copy_to_user(optval, &_v, len) != 0) \ + return -EFAULT; \ + \ + } while (0) + + err = 0; + sk = sock->sk; + vsk = vsock_sk(sk); + + switch (optname) { + case SO_VM_SOCKETS_BUFFER_SIZE: + val = transport->get_buffer_size(vsk); + COPY_OUT(val); + break; + + case SO_VM_SOCKETS_BUFFER_MAX_SIZE: + val = transport->get_max_buffer_size(vsk); + COPY_OUT(val); + break; + + case SO_VM_SOCKETS_BUFFER_MIN_SIZE: + val = transport->get_min_buffer_size(vsk); + COPY_OUT(val); + break; + + case SO_VM_SOCKETS_CONNECT_TIMEOUT: { + struct timeval tv; + tv.tv_sec = vsk->connect_timeout / HZ; + tv.tv_usec = + (vsk->connect_timeout - + tv.tv_sec * HZ) * (1000000 / HZ); + COPY_OUT(tv); + break; + } + default: + return -ENOPROTOOPT; + } + + err = put_user(len, optlen); + if (err != 0) + return -EFAULT; + +#undef COPY_OUT + + return 0; +} + +static int vsock_stream_sendmsg(struct kiocb *kiocb, struct socket *sock, + struct msghdr *msg, size_t len) +{ + struct sock *sk; + struct vsock_sock *vsk; + ssize_t total_written; + long timeout; + int err; + struct vsock_transport_send_notify_data send_data; + + DEFINE_WAIT(wait); + + sk = sock->sk; + vsk = vsock_sk(sk); + total_written = 0; + err = 0; + + if (msg->msg_flags & MSG_OOB) + return -EOPNOTSUPP; + + lock_sock(sk); + + /* Callers should not provide a destination with stream sockets. */ + if (msg->msg_namelen) { + err = sk->sk_state == SS_CONNECTED ? -EISCONN : -EOPNOTSUPP; + goto out; + } + + /* Send data only if both sides are not shutdown in the direction. */ + if (sk->sk_shutdown & SEND_SHUTDOWN || + vsk->peer_shutdown & RCV_SHUTDOWN) { + err = -EPIPE; + goto out; + } + + if (sk->sk_state != SS_CONNECTED || + !vsock_addr_bound(&vsk->local_addr)) { + err = -ENOTCONN; + goto out; + } + + if (!vsock_addr_bound(&vsk->remote_addr)) { + err = -EDESTADDRREQ; + goto out; + } + + /* Wait for room in the produce queue to enqueue our user's data. */ + timeout = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT); + + err = transport->notify_send_init(vsk, &send_data); + if (err < 0) + goto out; + + prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); + + while (total_written < len) { + ssize_t written; + + while (vsock_stream_has_space(vsk) == 0 && + sk->sk_err == 0 && + !(sk->sk_shutdown & SEND_SHUTDOWN) && + !(vsk->peer_shutdown & RCV_SHUTDOWN)) { + + /* Don't wait for non-blocking sockets. */ + if (timeout == 0) { + err = -EAGAIN; + goto out_wait; + } + + err = transport->notify_send_pre_block(vsk, &send_data); + if (err < 0) + goto out_wait; + + release_sock(sk); + timeout = schedule_timeout(timeout); + lock_sock(sk); + if (signal_pending(current)) { + err = sock_intr_errno(timeout); + goto out_wait; + } else if (timeout == 0) { + err = -EAGAIN; + goto out_wait; + } + + prepare_to_wait(sk_sleep(sk), &wait, + TASK_INTERRUPTIBLE); + } + + /* These checks occur both as part of and after the loop + * conditional since we need to check before and after + * sleeping. + */ + if (sk->sk_err) { + err = -sk->sk_err; + goto out_wait; + } else if ((sk->sk_shutdown & SEND_SHUTDOWN) || + (vsk->peer_shutdown & RCV_SHUTDOWN)) { + err = -EPIPE; + goto out_wait; + } + + err = transport->notify_send_pre_enqueue(vsk, &send_data); + if (err < 0) + goto out_wait; + + /* Note that enqueue will only write as many bytes as are free + * in the produce queue, so we don't need to ensure len is + * smaller than the queue size. It is the caller's + * responsibility to check how many bytes we were able to send. + */ + + written = transport->stream_enqueue( + vsk, msg->msg_iov, + len - total_written); + if (written < 0) { + err = -ENOMEM; + goto out_wait; + } + + total_written += written; + + err = transport->notify_send_post_enqueue( + vsk, written, &send_data); + if (err < 0) + goto out_wait; + + } + +out_wait: + if (total_written > 0) + err = total_written; + finish_wait(sk_sleep(sk), &wait); +out: + release_sock(sk); + return err; +} + + +static int +vsock_stream_recvmsg(struct kiocb *kiocb, + struct socket *sock, + struct msghdr *msg, size_t len, int flags) +{ + struct sock *sk; + struct vsock_sock *vsk; + int err; + size_t target; + ssize_t copied; + long timeout; + struct vsock_transport_recv_notify_data recv_data; + + DEFINE_WAIT(wait); + + sk = sock->sk; + vsk = vsock_sk(sk); + err = 0; + + lock_sock(sk); + + if (sk->sk_state != SS_CONNECTED) { + /* Recvmsg is supposed to return 0 if a peer performs an + * orderly shutdown. Differentiate between that case and when a + * peer has not connected or a local shutdown occured with the + * SOCK_DONE flag. + */ + if (sock_flag(sk, SOCK_DONE)) + err = 0; + else + err = -ENOTCONN; + + goto out; + } + + if (flags & MSG_OOB) { + err = -EOPNOTSUPP; + goto out; + } + + /* We don't check peer_shutdown flag here since peer may actually shut + * down, but there can be data in the queue that a local socket can + * receive. + */ + if (sk->sk_shutdown & RCV_SHUTDOWN) { + err = 0; + goto out; + } + + /* It is valid on Linux to pass in a zero-length receive buffer. This + * is not an error. We may as well bail out now. + */ + if (!len) { + err = 0; + goto out; + } + + /* We must not copy less than target bytes into the user's buffer + * before returning successfully, so we wait for the consume queue to + * have that much data to consume before dequeueing. Note that this + * makes it impossible to handle cases where target is greater than the + * queue size. + */ + target = sock_rcvlowat(sk, flags & MSG_WAITALL, len); + if (target >= transport->stream_rcvhiwat(vsk)) { + err = -ENOMEM; + goto out; + } + timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); + copied = 0; + + err = transport->notify_recv_init(vsk, target, &recv_data); + if (err < 0) + goto out; + + prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); + + while (1) { + s64 ready = vsock_stream_has_data(vsk); + + if (ready < 0) { + /* Invalid queue pair content. XXX This should be + * changed to a connection reset in a later change. + */ + + err = -ENOMEM; + goto out_wait; + } else if (ready > 0) { + ssize_t read; + + err = transport->notify_recv_pre_dequeue( + vsk, target, &recv_data); + if (err < 0) + break; + + read = transport->stream_dequeue( + vsk, msg->msg_iov, + len - copied, flags); + if (read < 0) { + err = -ENOMEM; + break; + } + + copied += read; + + err = transport->notify_recv_post_dequeue( + vsk, target, read, + !(flags & MSG_PEEK), &recv_data); + if (err < 0) + goto out_wait; + + if (read >= target || flags & MSG_PEEK) + break; + + target -= read; + } else { + if (sk->sk_err != 0 || (sk->sk_shutdown & RCV_SHUTDOWN) + || (vsk->peer_shutdown & SEND_SHUTDOWN)) { + break; + } + /* Don't wait for non-blocking sockets. */ + if (timeout == 0) { + err = -EAGAIN; + break; + } + + err = transport->notify_recv_pre_block( + vsk, target, &recv_data); + if (err < 0) + break; + + release_sock(sk); + timeout = schedule_timeout(timeout); + lock_sock(sk); + + if (signal_pending(current)) { + err = sock_intr_errno(timeout); + break; + } else if (timeout == 0) { + err = -EAGAIN; + break; + } + + prepare_to_wait(sk_sleep(sk), &wait, + TASK_INTERRUPTIBLE); + } + } + + if (sk->sk_err) + err = -sk->sk_err; + else if (sk->sk_shutdown & RCV_SHUTDOWN) + err = 0; + + if (copied > 0) { + /* We only do these additional bookkeeping/notification steps + * if we actually copied something out of the queue pair + * instead of just peeking ahead. + */ + + if (!(flags & MSG_PEEK)) { + /* If the other side has shutdown for sending and there + * is nothing more to read, then modify the socket + * state. + */ + if (vsk->peer_shutdown & SEND_SHUTDOWN) { + if (vsock_stream_has_data(vsk) <= 0) { + sk->sk_state = SS_UNCONNECTED; + sock_set_flag(sk, SOCK_DONE); + sk->sk_state_change(sk); + } + } + } + err = copied; + } + +out_wait: + finish_wait(sk_sleep(sk), &wait); +out: + release_sock(sk); + return err; +} + +static const struct proto_ops vsock_stream_ops = { + .family = PF_VSOCK, + .owner = THIS_MODULE, + .release = vsock_release, + .bind = vsock_bind, + .connect = vsock_stream_connect, + .socketpair = sock_no_socketpair, + .accept = vsock_accept, + .getname = vsock_getname, + .poll = vsock_poll, + .ioctl = sock_no_ioctl, + .listen = vsock_listen, + .shutdown = vsock_shutdown, + .setsockopt = vsock_stream_setsockopt, + .getsockopt = vsock_stream_getsockopt, + .sendmsg = vsock_stream_sendmsg, + .recvmsg = vsock_stream_recvmsg, + .mmap = sock_no_mmap, + .sendpage = sock_no_sendpage, +}; + +static int vsock_create(struct net *net, struct socket *sock, + int protocol, int kern) +{ + if (!sock) + return -EINVAL; + + if (protocol) + return -EPROTONOSUPPORT; + + switch (sock->type) { + case SOCK_DGRAM: + sock->ops = &vsock_dgram_ops; + break; + case SOCK_STREAM: + sock->ops = &vsock_stream_ops; + break; + default: + return -ESOCKTNOSUPPORT; + } + + sock->state = SS_UNCONNECTED; + + return __vsock_create(net, sock, NULL, GFP_KERNEL, 0) ? 0 : -ENOMEM; +} + +static const struct net_proto_family vsock_family_ops = { + .family = AF_VSOCK, + .create = vsock_create, + .owner = THIS_MODULE, +}; + +static long vsock_dev_do_ioctl(struct file *filp, + unsigned int cmd, void __user *ptr) +{ + u32 __user *p = ptr; + int retval = 0; + + switch (cmd) { + case IOCTL_VM_SOCKETS_GET_LOCAL_CID: + if (put_user(transport->get_local_cid(), p) != 0) + retval = -EFAULT; + break; + + default: + pr_err("Unknown ioctl %d\n", cmd); + retval = -EINVAL; + } + + return retval; +} + +static long vsock_dev_ioctl(struct file *filp, + unsigned int cmd, unsigned long arg) +{ + return vsock_dev_do_ioctl(filp, cmd, (void __user *)arg); +} + +#ifdef CONFIG_COMPAT +static long vsock_dev_compat_ioctl(struct file *filp, + unsigned int cmd, unsigned long arg) +{ + return vsock_dev_do_ioctl(filp, cmd, compat_ptr(arg)); +} +#endif + +static const struct file_operations vsock_device_ops = { + .owner = THIS_MODULE, + .unlocked_ioctl = vsock_dev_ioctl, +#ifdef CONFIG_COMPAT + .compat_ioctl = vsock_dev_compat_ioctl, +#endif + .open = nonseekable_open, +}; + +static struct miscdevice vsock_device = { + .name = "vsock", + .minor = MISC_DYNAMIC_MINOR, + .fops = &vsock_device_ops, +}; + +static int __vsock_core_init(void) +{ + int err; + + vsock_init_tables(); + + err = misc_register(&vsock_device); + if (err) { + pr_err("Failed to register misc device\n"); + return -ENOENT; + } + + err = proto_register(&vsock_proto, 1); /* we want our slab */ + if (err) { + pr_err("Cannot register vsock protocol\n"); + goto err_misc_deregister; + } + + err = sock_register(&vsock_family_ops); + if (err) { + pr_err("could not register af_vsock (%d) address family: %d\n", + AF_VSOCK, err); + goto err_unregister_proto; + } + + return 0; + +err_unregister_proto: + proto_unregister(&vsock_proto); +err_misc_deregister: + misc_deregister(&vsock_device); + return err; +} + +int vsock_core_init(const struct vsock_transport *t) +{ + int retval = mutex_lock_interruptible(&vsock_register_mutex); + if (retval) + return retval; + + if (transport) { + retval = -EBUSY; + goto out; + } + + transport = t; + retval = __vsock_core_init(); + if (retval) + transport = NULL; + +out: + mutex_unlock(&vsock_register_mutex); + return retval; +} +EXPORT_SYMBOL_GPL(vsock_core_init); + +void vsock_core_exit(void) +{ + mutex_lock(&vsock_register_mutex); + + misc_deregister(&vsock_device); + sock_unregister(AF_VSOCK); + proto_unregister(&vsock_proto); + + /* We do not want the assignment below re-ordered. */ + mb(); + transport = NULL; + + mutex_unlock(&vsock_register_mutex); +} +EXPORT_SYMBOL_GPL(vsock_core_exit); + +MODULE_AUTHOR("VMware, Inc."); +MODULE_DESCRIPTION("VMware Virtual Socket Family"); +MODULE_VERSION(VSOCK_DRIVER_VERSION_STRING); +MODULE_LICENSE("GPL v2"); diff --git a/net/vmw_vsock/af_vsock.h b/net/vmw_vsock/af_vsock.h new file mode 100644 index 0000000..7d64d36 --- /dev/null +++ b/net/vmw_vsock/af_vsock.h @@ -0,0 +1,175 @@ +/* + * VMware vSockets Driver + * + * Copyright (C) 2007-2013 VMware, Inc. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation version 2 and no later version. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + */ + +#ifndef __AF_VSOCK_H__ +#define __AF_VSOCK_H__ + +#include <linux/kernel.h> +#include <linux/workqueue.h> +#include <linux/vm_sockets.h> + +#include "vsock_addr.h" + +#define LAST_RESERVED_PORT 1023 + +#define vsock_sk(__sk) ((struct vsock_sock *)__sk) +#define sk_vsock(__vsk) (&(__vsk)->sk) + +struct vsock_sock { + /* sk must be the first member. */ + struct sock sk; + struct sockaddr_vm local_addr; + struct sockaddr_vm remote_addr; + /* Links for the global tables of bound and connected sockets. */ + struct list_head bound_table; + struct list_head connected_table; + /* Accessed without the socket lock held. This means it can never be + * modified outsided of socket create or destruct. + */ + bool trusted; + bool cached_peer_allow_dgram; /* Dgram communication allowed to + * cached peer? + */ + u32 cached_peer; /* Context ID of last dgram destination check. */ + const struct cred *owner; + /* Rest are SOCK_STREAM only. */ + long connect_timeout; + /* Listening socket that this came from. */ + struct sock *listener; + /* Used for pending list and accept queue during connection handshake. + * The listening socket is the head for both lists. Sockets created + * for connection requests are placed in the pending list until they + * are connected, at which point they are put in the accept queue list + * so they can be accepted in accept(). If accept() cannot accept the + * connection, it is marked as rejected so the cleanup function knows + * to clean up the socket. + */ + struct list_head pending_links; + struct list_head accept_queue; + bool rejected; + struct delayed_work dwork; + u32 peer_shutdown; + bool sent_request; + bool ignore_connecting_rst; + + /* Private to transport. */ + void *trans; +}; + +s64 vsock_stream_has_data(struct vsock_sock *vsk); +s64 vsock_stream_has_space(struct vsock_sock *vsk); +void vsock_pending_work(struct work_struct *work); +struct sock *__vsock_create(struct net *net, + struct socket *sock, + struct sock *parent, + gfp_t priority, unsigned short type); + +/**** TRANSPORT ****/ + +struct vsock_transport_recv_notify_data { + u64 data1; /* Transport-defined. */ + u64 data2; /* Transport-defined. */ + bool notify_on_block; +}; + +struct vsock_transport_send_notify_data { + u64 data1; /* Transport-defined. */ + u64 data2; /* Transport-defined. */ +}; + +struct vsock_transport { + /* Initialize/tear-down socket. */ + int (*init)(struct vsock_sock *, struct vsock_sock *); + void (*destruct)(struct vsock_sock *); + void (*release)(struct vsock_sock *); + + /* Connections. */ + int (*connect)(struct vsock_sock *); + + /* DGRAM. */ + int (*dgram_bind)(struct vsock_sock *, struct sockaddr_vm *); + int (*dgram_dequeue)(struct kiocb *kiocb, struct vsock_sock *vsk, + struct msghdr *msg, size_t len, int flags); + int (*dgram_enqueue)(struct vsock_sock *, struct sockaddr_vm *, + struct iovec *, size_t len); + bool (*dgram_allow)(u32 cid, u32 port); + + /* STREAM. */ + /* TODO: stream_bind() */ + ssize_t (*stream_dequeue)(struct vsock_sock *, struct iovec *, + size_t len, int flags); + ssize_t (*stream_enqueue)(struct vsock_sock *, struct iovec *, + size_t len); + s64 (*stream_has_data)(struct vsock_sock *); + s64 (*stream_has_space)(struct vsock_sock *); + u64 (*stream_rcvhiwat)(struct vsock_sock *); + bool (*stream_is_active)(struct vsock_sock *); + bool (*stream_allow)(u32 cid, u32 port); + + /* Notification. */ + int (*notify_poll_in)(struct vsock_sock *, size_t, bool *); + int (*notify_poll_out)(struct vsock_sock *, size_t, bool *); + int (*notify_recv_init)(struct vsock_sock *, size_t, + struct vsock_transport_recv_notify_data *); + int (*notify_recv_pre_block)(struct vsock_sock *, size_t, + struct vsock_transport_recv_notify_data *); + int (*notify_recv_pre_dequeue)(struct vsock_sock *, size_t, + struct vsock_transport_recv_notify_data *); + int (*notify_recv_post_dequeue)(struct vsock_sock *, size_t, + ssize_t, bool, struct vsock_transport_recv_notify_data *); + int (*notify_send_init)(struct vsock_sock *, + struct vsock_transport_send_notify_data *); + int (*notify_send_pre_block)(struct vsock_sock *, + struct vsock_transport_send_notify_data *); + int (*notify_send_pre_enqueue)(struct vsock_sock *, + struct vsock_transport_send_notify_data *); + int (*notify_send_post_enqueue)(struct vsock_sock *, ssize_t, + struct vsock_transport_send_notify_data *); + + /* Shutdown. */ + int (*shutdown)(struct vsock_sock *, int); + + /* Buffer sizes. */ + void (*set_buffer_size)(struct vsock_sock *, u64); + void (*set_min_buffer_size)(struct vsock_sock *, u64); + void (*set_max_buffer_size)(struct vsock_sock *, u64); + u64 (*get_buffer_size)(struct vsock_sock *); + u64 (*get_min_buffer_size)(struct vsock_sock *); + u64 (*get_max_buffer_size)(struct vsock_sock *); + + /* Addressing. */ + u32 (*get_local_cid)(void); +}; + +/**** CORE ****/ + +int vsock_core_init(const struct vsock_transport *t); +void vsock_core_exit(void); + +/**** UTILS ****/ + +void vsock_release_pending(struct sock *pending); +void vsock_add_pending(struct sock *listener, struct sock *pending); +void vsock_remove_pending(struct sock *listener, struct sock *pending); +void vsock_enqueue_accept(struct sock *listener, struct sock *connected); +void vsock_insert_connected(struct vsock_sock *vsk); +void vsock_remove_bound(struct vsock_sock *vsk); +void vsock_remove_connected(struct vsock_sock *vsk); +struct sock *vsock_find_bound_socket(struct sockaddr_vm *addr); +struct sock *vsock_find_connected_socket(struct sockaddr_vm *src, + struct sockaddr_vm *dst); +void vsock_for_each_connected_socket(void (*fn)(struct sock *sk)); + +#endif /* __AF_VSOCK_H__ */ diff --git a/net/vmw_vsock/vmci_transport.c b/net/vmw_vsock/vmci_transport.c new file mode 100644 index 0000000..e8a87cf --- /dev/null +++ b/net/vmw_vsock/vmci_transport.c @@ -0,0 +1,2157 @@ +/* + * VMware vSockets Driver + * + * Copyright (C) 2007-2013 VMware, Inc. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation version 2 and no later version. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + */ + +#include <linux/types.h> + +#define EXPORT_SYMTAB +#include <linux/bitops.h> +#include <linux/cred.h> +#include <linux/init.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/kmod.h> +#include <linux/list.h> +#include <linux/miscdevice.h> +#include <linux/module.h> +#include <linux/mutex.h> +#include <linux/net.h> +#include <linux/poll.h> +#include <linux/skbuff.h> +#include <linux/smp.h> +#include <linux/socket.h> +#include <linux/stddef.h> +#include <linux/unistd.h> +#include <linux/wait.h> +#include <linux/workqueue.h> +#include <net/sock.h> + +#include "af_vsock.h" +#include "vmci_transport_notify.h" + +static int vmci_transport_recv_dgram_cb(void *data, struct vmci_datagram *dg); +static int vmci_transport_recv_stream_cb(void *data, struct vmci_datagram *dg); +static void vmci_transport_peer_attach_cb(u32 sub_id, + const struct vmci_event_data *ed, + void *client_data); +static void vmci_transport_peer_detach_cb(u32 sub_id, + const struct vmci_event_data *ed, + void *client_data); +static void vmci_transport_recv_pkt_work(struct work_struct *work); +static int vmci_transport_recv_listen(struct sock *sk, + struct vmci_transport_packet *pkt); +static int vmci_transport_recv_connecting_server( + struct sock *sk, + struct sock *pending, + struct vmci_transport_packet *pkt); +static int vmci_transport_recv_connecting_client( + struct sock *sk, + struct vmci_transport_packet *pkt); +static int vmci_transport_recv_connecting_client_negotiate( + struct sock *sk, + struct vmci_transport_packet *pkt); +static int vmci_transport_recv_connecting_client_invalid( + struct sock *sk, + struct vmci_transport_packet *pkt); +static int vmci_transport_recv_connected(struct sock *sk, + struct vmci_transport_packet *pkt); +static bool vmci_transport_old_proto_override(bool *old_pkt_proto); +static u16 vmci_transport_new_proto_supported_versions(void); +static bool vmci_transport_proto_to_notify_struct(struct sock *sk, u16 *proto, + bool old_pkt_proto); + +struct vmci_transport_recv_pkt_info { + struct work_struct work; + struct sock *sk; + struct vmci_transport_packet pkt; +}; + +static struct vmci_handle vmci_transport_stream_handle = { VMCI_INVALID_ID, + VMCI_INVALID_ID }; +static u32 vmci_transport_qp_resumed_sub_id = VMCI_INVALID_ID; + +static int PROTOCOL_OVERRIDE = -1; + +#define VMCI_TRANSPORT_DEFAULT_QP_SIZE_MIN 128 +#define VMCI_TRANSPORT_DEFAULT_QP_SIZE 262144 +#define VMCI_TRANSPORT_DEFAULT_QP_SIZE_MAX 262144 + +/* The default peer timeout indicates how long we will wait for a peer response + * to a control message. + */ +#define VSOCK_DEFAULT_CONNECT_TIMEOUT (2 * HZ) + +#define SS_LISTEN 255 + +/* Helper function to convert from a VMCI error code to a VSock error code. */ + +static s32 vmci_transport_error_to_vsock_error(s32 vmci_error) +{ + int err; + + switch (vmci_error) { + case VMCI_ERROR_NO_MEM: + err = ENOMEM; + break; + case VMCI_ERROR_DUPLICATE_ENTRY: + case VMCI_ERROR_ALREADY_EXISTS: + err = EADDRINUSE; + break; + case VMCI_ERROR_NO_ACCESS: + err = EPERM; + break; + case VMCI_ERROR_NO_RESOURCES: + err = ENOBUFS; + break; + case VMCI_ERROR_INVALID_RESOURCE: + err = EHOSTUNREACH; + break; + case VMCI_ERROR_INVALID_ARGS: + default: + err = EINVAL; + } + + return err > 0 ? -err : err; +} + +static inline void +vmci_transport_packet_init(struct vmci_transport_packet *pkt, + struct sockaddr_vm *src, + struct sockaddr_vm *dst, + u8 type, + u64 size, + u64 mode, + struct vmci_transport_waiting_info *wait, + u16 proto, + struct vmci_handle handle) +{ + /* We register the stream control handler as an any cid handle so we + * must always send from a source address of VMADDR_CID_ANY + */ + pkt->dg.src = vmci_make_handle(VMADDR_CID_ANY, + VMCI_TRANSPORT_PACKET_RID); + pkt->dg.dst = vmci_make_handle(dst->svm_cid, + VMCI_TRANSPORT_PACKET_RID); + pkt->dg.payload_size = sizeof(*pkt) - sizeof(pkt->dg); + pkt->version = VMCI_TRANSPORT_PACKET_VERSION; + pkt->type = type; + pkt->src_port = src->svm_port; + pkt->dst_port = dst->svm_port; + memset(&pkt->proto, 0, sizeof(pkt->proto)); + memset(&pkt->_reserved2, 0, sizeof(pkt->_reserved2)); + + switch (pkt->type) { + case VMCI_TRANSPORT_PACKET_TYPE_INVALID: + pkt->u.size = 0; + break; + + case VMCI_TRANSPORT_PACKET_TYPE_REQUEST: + case VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE: + pkt->u.size = size; + break; + + case VMCI_TRANSPORT_PACKET_TYPE_OFFER: + case VMCI_TRANSPORT_PACKET_TYPE_ATTACH: + pkt->u.handle = handle; + break; + + case VMCI_TRANSPORT_PACKET_TYPE_WROTE: + case VMCI_TRANSPORT_PACKET_TYPE_READ: + case VMCI_TRANSPORT_PACKET_TYPE_RST: + pkt->u.size = 0; + break; + + case VMCI_TRANSPORT_PACKET_TYPE_SHUTDOWN: + pkt->u.mode = mode; + break; + + case VMCI_TRANSPORT_PACKET_TYPE_WAITING_READ: + case VMCI_TRANSPORT_PACKET_TYPE_WAITING_WRITE: + memcpy(&pkt->u.wait, wait, sizeof(pkt->u.wait)); + break; + + case VMCI_TRANSPORT_PACKET_TYPE_REQUEST2: + case VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE2: + pkt->u.size = size; + pkt->proto = proto; + break; + } +} + +static inline void +vmci_transport_packet_get_addresses(struct vmci_transport_packet *pkt, + struct sockaddr_vm *local, + struct sockaddr_vm *remote) +{ + vsock_addr_init(local, pkt->dg.dst.context, pkt->dst_port); + vsock_addr_init(remote, pkt->dg.src.context, pkt->src_port); +} + +static int +__vmci_transport_send_control_pkt(struct vmci_transport_packet *pkt, + struct sockaddr_vm *src, + struct sockaddr_vm *dst, + enum vmci_transport_packet_type type, + u64 size, + u64 mode, + struct vmci_transport_waiting_info *wait, + u16 proto, + struct vmci_handle handle, + bool convert_error) +{ + int err; + + vmci_transport_packet_init(pkt, src, dst, type, size, mode, wait, + proto, handle); + err = vmci_datagram_send(&pkt->dg); + if (convert_error && (err < 0)) + return vmci_transport_error_to_vsock_error(err); + + return err; +} + +static int +vmci_transport_reply_control_pkt_fast(struct vmci_transport_packet *pkt, + enum vmci_transport_packet_type type, + u64 size, + u64 mode, + struct vmci_transport_waiting_info *wait, + struct vmci_handle handle) +{ + struct vmci_transport_packet reply; + struct sockaddr_vm src, dst; + + if (pkt->type == VMCI_TRANSPORT_PACKET_TYPE_RST) { + return 0; + } else { + vmci_transport_packet_get_addresses(pkt, &src, &dst); + return __vmci_transport_send_control_pkt(&reply, &src, &dst, + type, + size, mode, wait, + VSOCK_PROTO_INVALID, + handle, true); + } +} + +static int +vmci_transport_send_control_pkt_bh(struct sockaddr_vm *src, + struct sockaddr_vm *dst, + enum vmci_transport_packet_type type, + u64 size, + u64 mode, + struct vmci_transport_waiting_info *wait, + struct vmci_handle handle) +{ + /* Note that it is safe to use a single packet across all CPUs since + * two tasklets of the same type are guaranteed to not ever run + * simultaneously. If that ever changes, or VMCI stops using tasklets, + * we can use per-cpu packets. + */ + static struct vmci_transport_packet pkt; + + return __vmci_transport_send_control_pkt(&pkt, src, dst, type, + size, mode, wait, + VSOCK_PROTO_INVALID, handle, + false); +} + +static int +vmci_transport_send_control_pkt(struct sock *sk, + enum vmci_transport_packet_type type, + u64 size, + u64 mode, + struct vmci_transport_waiting_info *wait, + u16 proto, + struct vmci_handle handle) +{ + struct vmci_transport_packet *pkt; + struct vsock_sock *vsk; + int err; + + vsk = vsock_sk(sk); + + if (!vsock_addr_bound(&vsk->local_addr)) + return -EINVAL; + + if (!vsock_addr_bound(&vsk->remote_addr)) + return -EINVAL; + + pkt = kmalloc(sizeof(*pkt), GFP_KERNEL); + if (!pkt) + return -ENOMEM; + + err = __vmci_transport_send_control_pkt(pkt, &vsk->local_addr, + &vsk->remote_addr, type, size, + mode, wait, proto, handle, + true); + kfree(pkt); + + return err; +} + +static int vmci_transport_send_reset_bh(struct sockaddr_vm *dst, + struct sockaddr_vm *src, + struct vmci_transport_packet *pkt) +{ + if (pkt->type == VMCI_TRANSPORT_PACKET_TYPE_RST) + return 0; + return vmci_transport_send_control_pkt_bh( + dst, src, + VMCI_TRANSPORT_PACKET_TYPE_RST, 0, + 0, NULL, VMCI_INVALID_HANDLE); +} + +static int vmci_transport_send_reset(struct sock *sk, + struct vmci_transport_packet *pkt) +{ + if (pkt->type == VMCI_TRANSPORT_PACKET_TYPE_RST) + return 0; + return vmci_transport_send_control_pkt(sk, + VMCI_TRANSPORT_PACKET_TYPE_RST, + 0, 0, NULL, VSOCK_PROTO_INVALID, + VMCI_INVALID_HANDLE); +} + +static int vmci_transport_send_negotiate(struct sock *sk, size_t size) +{ + return vmci_transport_send_control_pkt( + sk, + VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE, + size, 0, NULL, + VSOCK_PROTO_INVALID, + VMCI_INVALID_HANDLE); +} + +static int vmci_transport_send_negotiate2(struct sock *sk, size_t size, + u16 version) +{ + return vmci_transport_send_control_pkt( + sk, + VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE2, + size, 0, NULL, version, + VMCI_INVALID_HANDLE); +} + +static int vmci_transport_send_qp_offer(struct sock *sk, + struct vmci_handle handle) +{ + return vmci_transport_send_control_pkt( + sk, VMCI_TRANSPORT_PACKET_TYPE_OFFER, 0, + 0, NULL, + VSOCK_PROTO_INVALID, handle); +} + +static int vmci_transport_send_attach(struct sock *sk, + struct vmci_handle handle) +{ + return vmci_transport_send_control_pkt( + sk, VMCI_TRANSPORT_PACKET_TYPE_ATTACH, + 0, 0, NULL, VSOCK_PROTO_INVALID, + handle); +} + +static int vmci_transport_reply_reset(struct vmci_transport_packet *pkt) +{ + return vmci_transport_reply_control_pkt_fast( + pkt, + VMCI_TRANSPORT_PACKET_TYPE_RST, + 0, 0, NULL, + VMCI_INVALID_HANDLE); +} + +static int vmci_transport_send_invalid_bh(struct sockaddr_vm *dst, + struct sockaddr_vm *src) +{ + return vmci_transport_send_control_pkt_bh( + dst, src, + VMCI_TRANSPORT_PACKET_TYPE_INVALID, + 0, 0, NULL, VMCI_INVALID_HANDLE); +} + +int vmci_transport_send_wrote_bh(struct sockaddr_vm *dst, + struct sockaddr_vm *src) +{ + return vmci_transport_send_control_pkt_bh( + dst, src, + VMCI_TRANSPORT_PACKET_TYPE_WROTE, 0, + 0, NULL, VMCI_INVALID_HANDLE); +} + +int vmci_transport_send_read_bh(struct sockaddr_vm *dst, + struct sockaddr_vm *src) +{ + return vmci_transport_send_control_pkt_bh( + dst, src, + VMCI_TRANSPORT_PACKET_TYPE_READ, 0, + 0, NULL, VMCI_INVALID_HANDLE); +} + +int vmci_transport_send_wrote(struct sock *sk) +{ + return vmci_transport_send_control_pkt( + sk, VMCI_TRANSPORT_PACKET_TYPE_WROTE, 0, + 0, NULL, VSOCK_PROTO_INVALID, + VMCI_INVALID_HANDLE); +} + +int vmci_transport_send_read(struct sock *sk) +{ + return vmci_transport_send_control_pkt( + sk, VMCI_TRANSPORT_PACKET_TYPE_READ, 0, + 0, NULL, VSOCK_PROTO_INVALID, + VMCI_INVALID_HANDLE); +} + +int vmci_transport_send_waiting_write(struct sock *sk, + struct vmci_transport_waiting_info *wait) +{ + return vmci_transport_send_control_pkt( + sk, VMCI_TRANSPORT_PACKET_TYPE_WAITING_WRITE, + 0, 0, wait, VSOCK_PROTO_INVALID, + VMCI_INVALID_HANDLE); +} + +int vmci_transport_send_waiting_read(struct sock *sk, + struct vmci_transport_waiting_info *wait) +{ + return vmci_transport_send_control_pkt( + sk, VMCI_TRANSPORT_PACKET_TYPE_WAITING_READ, + 0, 0, wait, VSOCK_PROTO_INVALID, + VMCI_INVALID_HANDLE); +} + +static int vmci_transport_shutdown(struct vsock_sock *vsk, int mode) +{ + return vmci_transport_send_control_pkt( + &vsk->sk, + VMCI_TRANSPORT_PACKET_TYPE_SHUTDOWN, + 0, mode, NULL, + VSOCK_PROTO_INVALID, + VMCI_INVALID_HANDLE); +} + +static int vmci_transport_send_conn_request(struct sock *sk, size_t size) +{ + return vmci_transport_send_control_pkt(sk, + VMCI_TRANSPORT_PACKET_TYPE_REQUEST, + size, 0, NULL, + VSOCK_PROTO_INVALID, + VMCI_INVALID_HANDLE); +} + +static int vmci_transport_send_conn_request2(struct sock *sk, size_t size, + u16 version) +{ + return vmci_transport_send_control_pkt( + sk, VMCI_TRANSPORT_PACKET_TYPE_REQUEST2, + size, 0, NULL, version, + VMCI_INVALID_HANDLE); +} + +static struct sock *vmci_transport_get_pending( + struct sock *listener, + struct vmci_transport_packet *pkt) +{ + struct vsock_sock *vlistener; + struct vsock_sock *vpending; + struct sock *pending; + + vlistener = vsock_sk(listener); + + list_for_each_entry(vpending, &vlistener->pending_links, + pending_links) { + struct sockaddr_vm src; + struct sockaddr_vm dst; + + vsock_addr_init(&src, pkt->dg.src.context, pkt->src_port); + vsock_addr_init(&dst, pkt->dg.dst.context, pkt->dst_port); + + if (vsock_addr_equals_addr(&src, &vpending->remote_addr) && + vsock_addr_equals_addr(&dst, &vpending->local_addr)) { + pending = sk_vsock(vpending); + sock_hold(pending); + goto found; + } + } + + pending = NULL; +found: + return pending; + +} + +static void vmci_transport_release_pending(struct sock *pending) +{ + sock_put(pending); +} + +/* We allow two kinds of sockets to communicate with a restricted VM: 1) + * trusted sockets 2) sockets from applications running as the same user as the + * VM (this is only true for the host side and only when using hosted products) + */ + +static bool vmci_transport_is_trusted(struct vsock_sock *vsock, u32 peer_cid) +{ + return vsock->trusted || + vmci_is_context_owner(peer_cid, vsock->owner->uid); +} + +/* We allow sending datagrams to and receiving datagrams from a restricted VM + * only if it is trusted as described in vmci_transport_is_trusted. + */ + +static bool vmci_transport_allow_dgram(struct vsock_sock *vsock, u32 peer_cid) +{ + if (vsock->cached_peer != peer_cid) { + vsock->cached_peer = peer_cid; + if (!vmci_transport_is_trusted(vsock, peer_cid) && + (vmci_context_get_priv_flags(peer_cid) & + VMCI_PRIVILEGE_FLAG_RESTRICTED)) { + vsock->cached_peer_allow_dgram = false; + } else { + vsock->cached_peer_allow_dgram = true; + } + } + + return vsock->cached_peer_allow_dgram; +} + +static int +vmci_transport_queue_pair_alloc(struct vmci_qp **qpair, + struct vmci_handle *handle, + u64 produce_size, + u64 consume_size, + u32 peer, u32 flags, bool trusted) +{ + int err = 0; + + if (trusted) { + /* Try to allocate our queue pair as trusted. This will only + * work if vsock is running in the host. + */ + + err = vmci_qpair_alloc(qpair, handle, produce_size, + consume_size, + peer, flags, + VMCI_PRIVILEGE_FLAG_TRUSTED); + if (err != VMCI_ERROR_NO_ACCESS) + goto out; + + } + + err = vmci_qpair_alloc(qpair, handle, produce_size, consume_size, + peer, flags, VMCI_NO_PRIVILEGE_FLAGS); +out: + if (err < 0) { + pr_err("Could not attach to queue pair with %d\n", + err); + err = vmci_transport_error_to_vsock_error(err); + } + + return err; +} + +static int +vmci_transport_datagram_create_hnd(u32 resource_id, + u32 flags, + vmci_datagram_recv_cb recv_cb, + void *client_data, + struct vmci_handle *out_handle) +{ + int err = 0; + + /* Try to allocate our datagram handler as trusted. This will only work + * if vsock is running in the host. + */ + + err = vmci_datagram_create_handle_priv(resource_id, flags, + VMCI_PRIVILEGE_FLAG_TRUSTED, + recv_cb, + client_data, out_handle); + + if (err == VMCI_ERROR_NO_ACCESS) + err = vmci_datagram_create_handle(resource_id, flags, + recv_cb, client_data, + out_handle); + + return err; +} + +/* This is invoked as part of a tasklet that's scheduled when the VMCI + * interrupt fires. This is run in bottom-half context and if it ever needs to + * sleep it should defer that work to a work queue. + */ + +static int vmci_transport_recv_dgram_cb(void *data, struct vmci_datagram *dg) +{ + struct sock *sk; + size_t size; + struct sk_buff *skb; + struct vsock_sock *vsk; + + sk = (struct sock *)data; + + /* This handler is privileged when this module is running on the host. + * We will get datagrams from all endpoints (even VMs that are in a + * restricted context). If we get one from a restricted context then + * the destination socket must be trusted. + * + * NOTE: We access the socket struct without holding the lock here. + * This is ok because the field we are interested is never modified + * outside of the create and destruct socket functions. + */ + vsk = vsock_sk(sk); + if (!vmci_transport_allow_dgram(vsk, dg->src.context)) + return VMCI_ERROR_NO_ACCESS; + + size = VMCI_DG_SIZE(dg); + + /* Attach the packet to the socket's receive queue as an sk_buff. */ + skb = alloc_skb(size, GFP_ATOMIC); + if (skb) { + /* sk_receive_skb() will do a sock_put(), so hold here. */ + sock_hold(sk); + skb_put(skb, size); + memcpy(skb->data, dg, size); + sk_receive_skb(sk, skb, 0); + } + + return VMCI_SUCCESS; +} + +static bool vmci_transport_stream_allow(u32 cid, u32 port) +{ + static const u32 non_socket_contexts[] = { + VMADDR_CID_HYPERVISOR, + VMADDR_CID_RESERVED, + }; + int i; + + BUILD_BUG_ON(sizeof(cid) != sizeof(*non_socket_contexts)); + + for (i = 0; i < ARRAY_SIZE(non_socket_contexts); i++) { + if (cid == non_socket_contexts[i]) + return false; + } + + return true; +} + +/* This is invoked as part of a tasklet that's scheduled when the VMCI + * interrupt fires. This is run in bottom-half context but it defers most of + * its work to the packet handling work queue. + */ + +static int vmci_transport_recv_stream_cb(void *data, struct vmci_datagram *dg) +{ + struct sock *sk; + struct sockaddr_vm dst; + struct sockaddr_vm src; + struct vmci_transport_packet *pkt; + struct vsock_sock *vsk; + bool bh_process_pkt; + int err; + + sk = NULL; + err = VMCI_SUCCESS; + bh_process_pkt = false; + + /* Ignore incoming packets from contexts without sockets, or resources + * that aren't vsock implementations. + */ + + if (!vmci_transport_stream_allow(dg->src.context, -1) + || VMCI_TRANSPORT_PACKET_RID != dg->src.resource) + return VMCI_ERROR_NO_ACCESS; + + if (VMCI_DG_SIZE(dg) < sizeof(*pkt)) + /* Drop datagrams that do not contain full VSock packets. */ + return VMCI_ERROR_INVALID_ARGS; + + pkt = (struct vmci_transport_packet *)dg; + + /* Find the socket that should handle this packet. First we look for a + * connected socket and if there is none we look for a socket bound to + * the destintation address. + */ + vsock_addr_init(&src, pkt->dg.src.context, pkt->src_port); + vsock_addr_init(&dst, pkt->dg.dst.context, pkt->dst_port); + + sk = vsock_find_connected_socket(&src, &dst); + if (!sk) { + sk = vsock_find_bound_socket(&dst); + if (!sk) { + /* We could not find a socket for this specified + * address. If this packet is a RST, we just drop it. + * If it is another packet, we send a RST. Note that + * we do not send a RST reply to RSTs so that we do not + * continually send RSTs between two endpoints. + * + * Note that since this is a reply, dst is src and src + * is dst. + */ + if (vmci_transport_send_reset_bh(&dst, &src, pkt) < 0) + pr_err("unable to send reset\n"); + + err = VMCI_ERROR_NOT_FOUND; + goto out; + } + } + + /* If the received packet type is beyond all types known to this + * implementation, reply with an invalid message. Hopefully this will + * help when implementing backwards compatibility in the future. + */ + if (pkt->type >= VMCI_TRANSPORT_PACKET_TYPE_MAX) { + vmci_transport_send_invalid_bh(&dst, &src); + err = VMCI_ERROR_INVALID_ARGS; + goto out; + } + + /* This handler is privileged when this module is running on the host. + * We will get datagram connect requests from all endpoints (even VMs + * that are in a restricted context). If we get one from a restricted + * context then the destination socket must be trusted. + * + * NOTE: We access the socket struct without holding the lock here. + * This is ok because the field we are interested is never modified + * outside of the create and destruct socket functions. + */ + vsk = vsock_sk(sk); + if (!vmci_transport_allow_dgram(vsk, pkt->dg.src.context)) { + err = VMCI_ERROR_NO_ACCESS; + goto out; + } + + /* We do most everything in a work queue, but let's fast path the + * notification of reads and writes to help data transfer performance. + * We can only do this if there is no process context code executing + * for this socket since that may change the state. + */ + bh_lock_sock(sk); + + if (!sock_owned_by_user(sk) && sk->sk_state == SS_CONNECTED) + vmci_trans(vsk)->notify_ops->handle_notify_pkt( + sk, pkt, true, &dst, &src, + &bh_process_pkt); + + bh_unlock_sock(sk); + + if (!bh_process_pkt) { + struct vmci_transport_recv_pkt_info *recv_pkt_info; + + recv_pkt_info = kmalloc(sizeof(*recv_pkt_info), GFP_ATOMIC); + if (!recv_pkt_info) { + if (vmci_transport_send_reset_bh(&dst, &src, pkt) < 0) + pr_err("unable to send reset\n"); + + err = VMCI_ERROR_NO_MEM; + goto out; + } + + recv_pkt_info->sk = sk; + memcpy(&recv_pkt_info->pkt, pkt, sizeof(recv_pkt_info->pkt)); + INIT_WORK(&recv_pkt_info->work, vmci_transport_recv_pkt_work); + + schedule_work(&recv_pkt_info->work); + /* Clear sk so that the reference count incremented by one of + * the Find functions above is not decremented below. We need + * that reference count for the packet handler we've scheduled + * to run. + */ + sk = NULL; + } + +out: + if (sk) + sock_put(sk); + + return err; +} + +static void vmci_transport_peer_attach_cb(u32 sub_id, + const struct vmci_event_data *e_data, + void *client_data) +{ + struct sock *sk = client_data; + const struct vmci_event_payload_qp *e_payload; + struct vsock_sock *vsk; + + e_payload = vmci_event_data_const_payload(e_data); + + vsk = vsock_sk(sk); + + /* We don't ask for delayed CBs when we subscribe to this event (we + * pass 0 as flags to vmci_event_subscribe()). VMCI makes no + * guarantees in that case about what context we might be running in, + * so it could be BH or process, blockable or non-blockable. So we + * need to account for all possible contexts here. + */ + local_bh_disable(); + bh_lock_sock(sk); + + /* XXX This is lame, we should provide a way to lookup sockets by + * qp_handle. + */ + if (vmci_handle_is_equal(vmci_trans(vsk)->qp_handle, + e_payload->handle)) { + /* XXX This doesn't do anything, but in the future we may want + * to set a flag here to verify the attach really did occur and + * we weren't just sent a datagram claiming it was. + */ + goto out; + } + +out: + bh_unlock_sock(sk); + local_bh_enable(); +} + +static void vmci_transport_handle_detach(struct sock *sk) +{ + struct vsock_sock *vsk; + + vsk = vsock_sk(sk); + if (!vmci_handle_is_invalid(vmci_trans(vsk)->qp_handle)) { + sock_set_flag(sk, SOCK_DONE); + + /* On a detach the peer will not be sending or receiving + * anymore. + */ + vsk->peer_shutdown = SHUTDOWN_MASK; + + /* We should not be sending anymore since the peer won't be + * there to receive, but we can still receive if there is data + * left in our consume queue. + */ + if (vsock_stream_has_data(vsk) <= 0) { + if (sk->sk_state == SS_CONNECTING) { + /* The peer may detach from a queue pair while + * we are still in the connecting state, i.e., + * if the peer VM is killed after attaching to + * a queue pair, but before we complete the + * handshake. In that case, we treat the detach + * event like a reset. + */ + + sk->sk_state = SS_UNCONNECTED; + sk->sk_err = ECONNRESET; + sk->sk_error_report(sk); + return; + } + sk->sk_state = SS_UNCONNECTED; + } + sk->sk_state_change(sk); + } +} + +static void vmci_transport_peer_detach_cb(u32 sub_id, + const struct vmci_event_data *e_data, + void *client_data) +{ + struct sock *sk = client_data; + const struct vmci_event_payload_qp *e_payload; + struct vsock_sock *vsk; + + e_payload = vmci_event_data_const_payload(e_data); + vsk = vsock_sk(sk); + if (vmci_handle_is_invalid(e_payload->handle)) + return; + + /* Same rules for locking as for peer_attach_cb(). */ + local_bh_disable(); + bh_lock_sock(sk); + + /* XXX This is lame, we should provide a way to lookup sockets by + * qp_handle. + */ + if (vmci_handle_is_equal(vmci_trans(vsk)->qp_handle, + e_payload->handle)) + vmci_transport_handle_detach(sk); + + bh_unlock_sock(sk); + local_bh_enable(); +} + +static void vmci_transport_qp_resumed_cb(u32 sub_id, + const struct vmci_event_data *e_data, + void *client_data) +{ + vsock_for_each_connected_socket(vmci_transport_handle_detach); +} + +static void vmci_transport_recv_pkt_work(struct work_struct *work) +{ + struct vmci_transport_recv_pkt_info *recv_pkt_info; + struct vmci_transport_packet *pkt; + struct sock *sk; + + recv_pkt_info = + container_of(work, struct vmci_transport_recv_pkt_info, work); + sk = recv_pkt_info->sk; + pkt = &recv_pkt_info->pkt; + + lock_sock(sk); + + switch (sk->sk_state) { + case SS_LISTEN: + vmci_transport_recv_listen(sk, pkt); + break; + case SS_CONNECTING: + /* Processing of pending connections for servers goes through + * the listening socket, so see vmci_transport_recv_listen() + * for that path. + */ + vmci_transport_recv_connecting_client(sk, pkt); + break; + case SS_CONNECTED: + vmci_transport_recv_connected(sk, pkt); + break; + default: + /* Because this function does not run in the same context as + * vmci_transport_recv_stream_cb it is possible that the + * socket has closed. We need to let the other side know or it + * could be sitting in a connect and hang forever. Send a + * reset to prevent that. + */ + vmci_transport_send_reset(sk, pkt); + goto out; + } + +out: + release_sock(sk); + kfree(recv_pkt_info); + /* Release reference obtained in the stream callback when we fetched + * this socket out of the bound or connected list. + */ + sock_put(sk); +} + +static int vmci_transport_recv_listen(struct sock *sk, + struct vmci_transport_packet *pkt) +{ + struct sock *pending; + struct vsock_sock *vpending; + int err; + u64 qp_size; + bool old_request = false; + bool old_pkt_proto = false; + + err = 0; + + /* Because we are in the listen state, we could be receiving a packet + * for ourself or any previous connection requests that we received. + * If it's the latter, we try to find a socket in our list of pending + * connections and, if we do, call the appropriate handler for the + * state that that socket is in. Otherwise we try to service the + * connection request. + */ + pending = vmci_transport_get_pending(sk, pkt); + if (pending) { + lock_sock(pending); + switch (pending->sk_state) { + case SS_CONNECTING: + err = vmci_transport_recv_connecting_server(sk, + pending, + pkt); + break; + default: + vmci_transport_send_reset(pending, pkt); + err = -EINVAL; + } + + if (err < 0) + vsock_remove_pending(sk, pending); + + release_sock(pending); + vmci_transport_release_pending(pending); + + return err; + } + + /* The listen state only accepts connection requests. Reply with a + * reset unless we received a reset. + */ + + if (!(pkt->type == VMCI_TRANSPORT_PACKET_TYPE_REQUEST || + pkt->type == VMCI_TRANSPORT_PACKET_TYPE_REQUEST2)) { + vmci_transport_reply_reset(pkt); + return -EINVAL; + } + + if (pkt->u.size == 0) { + vmci_transport_reply_reset(pkt); + return -EINVAL; + } + + /* If this socket can't accommodate this connection request, we send a + * reset. Otherwise we create and initialize a child socket and reply + * with a connection negotiation. + */ + if (sk->sk_ack_backlog >= sk->sk_max_ack_backlog) { + vmci_transport_reply_reset(pkt); + return -ECONNREFUSED; + } + + pending = __vsock_create(sock_net(sk), NULL, sk, GFP_KERNEL, + sk->sk_type); + if (!pending) { + vmci_transport_send_reset(sk, pkt); + return -ENOMEM; + } + + vpending = vsock_sk(pending); + + vsock_addr_init(&vpending->local_addr, pkt->dg.dst.context, + pkt->dst_port); + vsock_addr_init(&vpending->remote_addr, pkt->dg.src.context, + pkt->src_port); + + /* If the proposed size fits within our min/max, accept it. Otherwise + * propose our own size. + */ + if (pkt->u.size >= vmci_trans(vpending)->queue_pair_min_size && + pkt->u.size <= vmci_trans(vpending)->queue_pair_max_size) { + qp_size = pkt->u.size; + } else { + qp_size = vmci_trans(vpending)->queue_pair_size; + } + + /* Figure out if we are using old or new requests based on the + * overrides pkt types sent by our peer. + */ + if (vmci_transport_old_proto_override(&old_pkt_proto)) { + old_request = old_pkt_proto; + } else { + if (pkt->type == VMCI_TRANSPORT_PACKET_TYPE_REQUEST) + old_request = true; + else if (pkt->type == VMCI_TRANSPORT_PACKET_TYPE_REQUEST2) + old_request = false; + + } + + if (old_request) { + /* Handle a REQUEST (or override) */ + u16 version = VSOCK_PROTO_INVALID; + if (vmci_transport_proto_to_notify_struct( + pending, &version, true)) + err = vmci_transport_send_negotiate(pending, qp_size); + else + err = -EINVAL; + + } else { + /* Handle a REQUEST2 (or override) */ + int proto_int = pkt->proto; + int pos; + u16 active_proto_version = 0; + + /* The list of possible protocols is the intersection of all + * protocols the client supports ... plus all the protocols we + * support. + */ + proto_int &= vmci_transport_new_proto_supported_versions(); + + /* We choose the highest possible protocol version and use that + * one. + */ + pos = fls(proto_int); + if (pos) { + active_proto_version = (1 << (pos - 1)); + if (vmci_transport_proto_to_notify_struct( + pending, &active_proto_version, false)) + err = vmci_transport_send_negotiate2(pending, + qp_size, + active_proto_version); + else + err = -EINVAL; + + } else { + err = -EINVAL; + } + } + + if (err < 0) { + vmci_transport_send_reset(sk, pkt); + sock_put(pending); + err = vmci_transport_error_to_vsock_error(err); + goto out; + } + + vsock_add_pending(sk, pending); + sk->sk_ack_backlog++; + + pending->sk_state = SS_CONNECTING; + vmci_trans(vpending)->produce_size = + vmci_trans(vpending)->consume_size = qp_size; + vmci_trans(vpending)->queue_pair_size = qp_size; + + vmci_trans(vpending)->notify_ops->process_request(pending); + + /* We might never receive another message for this socket and it's not + * connected to any process, so we have to ensure it gets cleaned up + * ourself. Our delayed work function will take care of that. Note + * that we do not ever cancel this function since we have few + * guarantees about its state when calling cancel_delayed_work(). + * Instead we hold a reference on the socket for that function and make + * it capable of handling cases where it needs to do nothing but + * release that reference. + */ + vpending->listener = sk; + sock_hold(sk); + sock_hold(pending); + INIT_DELAYED_WORK(&vpending->dwork, vsock_pending_work); + schedule_delayed_work(&vpending->dwork, HZ); + +out: + return err; +} + +static int +vmci_transport_recv_connecting_server(struct sock *listener, + struct sock *pending, + struct vmci_transport_packet *pkt) +{ + struct vsock_sock *vpending; + struct vmci_handle handle; + struct vmci_qp *qpair; + bool is_local; + u32 flags; + u32 detach_sub_id; + int err; + int skerr; + + vpending = vsock_sk(pending); + detach_sub_id = VMCI_INVALID_ID; + + switch (pkt->type) { + case VMCI_TRANSPORT_PACKET_TYPE_OFFER: + if (vmci_handle_is_invalid(pkt->u.handle)) { + vmci_transport_send_reset(pending, pkt); + skerr = EPROTO; + err = -EINVAL; + goto destroy; + } + break; + default: + /* Close and cleanup the connection. */ + vmci_transport_send_reset(pending, pkt); + skerr = EPROTO; + err = pkt->type == VMCI_TRANSPORT_PACKET_TYPE_RST ? 0 : -EINVAL; + goto destroy; + } + + /* In order to complete the connection we need to attach to the offered + * queue pair and send an attach notification. We also subscribe to the + * detach event so we know when our peer goes away, and we do that + * before attaching so we don't miss an event. If all this succeeds, + * we update our state and wakeup anything waiting in accept() for a + * connection. + */ + + /* We don't care about attach since we ensure the other side has + * attached by specifying the ATTACH_ONLY flag below. + */ + err = vmci_event_subscribe(VMCI_EVENT_QP_PEER_DETACH, + vmci_transport_peer_detach_cb, + pending, &detach_sub_id); + if (err < VMCI_SUCCESS) { + vmci_transport_send_reset(pending, pkt); + err = vmci_transport_error_to_vsock_error(err); + skerr = -err; + goto destroy; + } + + vmci_trans(vpending)->detach_sub_id = detach_sub_id; + + /* Now attach to the queue pair the client created. */ + handle = pkt->u.handle; + + /* vpending->local_addr always has a context id so we do not need to + * worry about VMADDR_CID_ANY in this case. + */ + is_local = + vpending->remote_addr.svm_cid == vpending->local_addr.svm_cid; + flags = VMCI_QPFLAG_ATTACH_ONLY; + flags |= is_local ? VMCI_QPFLAG_LOCAL : 0; + + err = vmci_transport_queue_pair_alloc( + &qpair, + &handle, + vmci_trans(vpending)->produce_size, + vmci_trans(vpending)->consume_size, + pkt->dg.src.context, + flags, + vmci_transport_is_trusted( + vpending, + vpending->remote_addr.svm_cid)); + if (err < 0) { + vmci_transport_send_reset(pending, pkt); + skerr = -err; + goto destroy; + } + + vmci_trans(vpending)->qp_handle = handle; + vmci_trans(vpending)->qpair = qpair; + + /* When we send the attach message, we must be ready to handle incoming + * control messages on the newly connected socket. So we move the + * pending socket to the connected state before sending the attach + * message. Otherwise, an incoming packet triggered by the attach being + * received by the peer may be processed concurrently with what happens + * below after sending the attach message, and that incoming packet + * will find the listening socket instead of the (currently) pending + * socket. Note that enqueueing the socket increments the reference + * count, so even if a reset comes before the connection is accepted, + * the socket will be valid until it is removed from the queue. + * + * If we fail sending the attach below, we remove the socket from the + * connected list and move the socket to SS_UNCONNECTED before + * releasing the lock, so a pending slow path processing of an incoming + * packet will not see the socket in the connected state in that case. + */ + pending->sk_state = SS_CONNECTED; + + vsock_insert_connected(vpending); + + /* Notify our peer of our attach. */ + err = vmci_transport_send_attach(pending, handle); + if (err < 0) { + vsock_remove_connected(vpending); + pr_err("Could not send attach\n"); + vmci_transport_send_reset(pending, pkt); + err = vmci_transport_error_to_vsock_error(err); + skerr = -err; + goto destroy; + } + + /* We have a connection. Move the now connected socket from the + * listener's pending list to the accept queue so callers of accept() + * can find it. + */ + vsock_remove_pending(listener, pending); + vsock_enqueue_accept(listener, pending); + + /* Callers of accept() will be be waiting on the listening socket, not + * the pending socket. + */ + listener->sk_state_change(listener); + + return 0; + +destroy: + pending->sk_err = skerr; + pending->sk_state = SS_UNCONNECTED; + /* As long as we drop our reference, all necessary cleanup will handle + * when the cleanup function drops its reference and our destruct + * implementation is called. Note that since the listen handler will + * remove pending from the pending list upon our failure, the cleanup + * function won't drop the additional reference, which is why we do it + * here. + */ + sock_put(pending); + + return err; +} + +static int +vmci_transport_recv_connecting_client(struct sock *sk, + struct vmci_transport_packet *pkt) +{ + struct vsock_sock *vsk; + int err; + int skerr; + + vsk = vsock_sk(sk); + + switch (pkt->type) { + case VMCI_TRANSPORT_PACKET_TYPE_ATTACH: + if (vmci_handle_is_invalid(pkt->u.handle) || + !vmci_handle_is_equal(pkt->u.handle, + vmci_trans(vsk)->qp_handle)) { + skerr = EPROTO; + err = -EINVAL; + goto destroy; + } + + /* Signify the socket is connected and wakeup the waiter in + * connect(). Also place the socket in the connected table for + * accounting (it can already be found since it's in the bound + * table). + */ + sk->sk_state = SS_CONNECTED; + sk->sk_socket->state = SS_CONNECTED; + vsock_insert_connected(vsk); + sk->sk_state_change(sk); + + break; + case VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE: + case VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE2: + if (pkt->u.size == 0 + || pkt->dg.src.context != vsk->remote_addr.svm_cid + || pkt->src_port != vsk->remote_addr.svm_port + || !vmci_handle_is_invalid(vmci_trans(vsk)->qp_handle) + || vmci_trans(vsk)->qpair + || vmci_trans(vsk)->produce_size != 0 + || vmci_trans(vsk)->consume_size != 0 + || vmci_trans(vsk)->attach_sub_id != VMCI_INVALID_ID + || vmci_trans(vsk)->detach_sub_id != VMCI_INVALID_ID) { + skerr = EPROTO; + err = -EINVAL; + + goto destroy; + } + + err = vmci_transport_recv_connecting_client_negotiate(sk, pkt); + if (err) { + skerr = -err; + goto destroy; + } + + break; + case VMCI_TRANSPORT_PACKET_TYPE_INVALID: + err = vmci_transport_recv_connecting_client_invalid(sk, pkt); + if (err) { + skerr = -err; + goto destroy; + } + + break; + case VMCI_TRANSPORT_PACKET_TYPE_RST: + /* Older versions of the linux code (WS 6.5 / ESX 4.0) used to + * continue processing here after they sent an INVALID packet. + * This meant that we got a RST after the INVALID. We ignore a + * RST after an INVALID. The common code doesn't send the RST + * ... so we can hang if an old version of the common code + * fails between getting a REQUEST and sending an OFFER back. + * Not much we can do about it... except hope that it doesn't + * happen. + */ + if (vsk->ignore_connecting_rst) { + vsk->ignore_connecting_rst = false; + } else { + skerr = ECONNRESET; + err = 0; + goto destroy; + } + + break; + default: + /* Close and cleanup the connection. */ + skerr = EPROTO; + err = -EINVAL; + goto destroy; + } + + return 0; + +destroy: + vmci_transport_send_reset(sk, pkt); + + sk->sk_state = SS_UNCONNECTED; + sk->sk_err = skerr; + sk->sk_error_report(sk); + return err; +} + +static int vmci_transport_recv_connecting_client_negotiate( + struct sock *sk, + struct vmci_transport_packet *pkt) +{ + int err; + struct vsock_sock *vsk; + struct vmci_handle handle; + struct vmci_qp *qpair; + u32 attach_sub_id; + u32 detach_sub_id; + bool is_local; + u32 flags; + bool old_proto = true; + bool old_pkt_proto; + u16 version; + + vsk = vsock_sk(sk); + handle = VMCI_INVALID_HANDLE; + attach_sub_id = VMCI_INVALID_ID; + detach_sub_id = VMCI_INVALID_ID; + + /* If we have gotten here then we should be past the point where old + * linux vsock could have sent the bogus rst. + */ + vsk->sent_request = false; + vsk->ignore_connecting_rst = false; + + /* Verify that we're OK with the proposed queue pair size */ + if (pkt->u.size < vmci_trans(vsk)->queue_pair_min_size || + pkt->u.size > vmci_trans(vsk)->queue_pair_max_size) { + err = -EINVAL; + goto destroy; + } + + /* At this point we know the CID the peer is using to talk to us. */ + + if (vsk->local_addr.svm_cid == VMADDR_CID_ANY) + vsk->local_addr.svm_cid = pkt->dg.dst.context; + + /* Setup the notify ops to be the highest supported version that both + * the server and the client support. + */ + + if (vmci_transport_old_proto_override(&old_pkt_proto)) { + old_proto = old_pkt_proto; + } else { + if (pkt->type == VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE) + old_proto = true; + else if (pkt->type == VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE2) + old_proto = false; + + } + + if (old_proto) + version = VSOCK_PROTO_INVALID; + else + version = pkt->proto; + + if (!vmci_transport_proto_to_notify_struct(sk, &version, old_proto)) { + err = -EINVAL; + goto destroy; + } + + /* Subscribe to attach and detach events first. + * + * XXX We attach once for each queue pair created for now so it is easy + * to find the socket (it's provided), but later we should only + * subscribe once and add a way to lookup sockets by queue pair handle. + */ + err = vmci_event_subscribe(VMCI_EVENT_QP_PEER_ATTACH, + vmci_transport_peer_attach_cb, + sk, &attach_sub_id); + if (err < VMCI_SUCCESS) { + err = vmci_transport_error_to_vsock_error(err); + goto destroy; + } + + err = vmci_event_subscribe(VMCI_EVENT_QP_PEER_DETACH, + vmci_transport_peer_detach_cb, + sk, &detach_sub_id); + if (err < VMCI_SUCCESS) { + err = vmci_transport_error_to_vsock_error(err); + goto destroy; + } + + /* Make VMCI select the handle for us. */ + handle = VMCI_INVALID_HANDLE; + is_local = vsk->remote_addr.svm_cid == vsk->local_addr.svm_cid; + flags = is_local ? VMCI_QPFLAG_LOCAL : 0; + + err = vmci_transport_queue_pair_alloc(&qpair, + &handle, + pkt->u.size, + pkt->u.size, + vsk->remote_addr.svm_cid, + flags, + vmci_transport_is_trusted( + vsk, + vsk-> + remote_addr.svm_cid)); + if (err < 0) + goto destroy; + + err = vmci_transport_send_qp_offer(sk, handle); + if (err < 0) { + err = vmci_transport_error_to_vsock_error(err); + goto destroy; + } + + vmci_trans(vsk)->qp_handle = handle; + vmci_trans(vsk)->qpair = qpair; + + vmci_trans(vsk)->produce_size = vmci_trans(vsk)->consume_size = + pkt->u.size; + + vmci_trans(vsk)->attach_sub_id = attach_sub_id; + vmci_trans(vsk)->detach_sub_id = detach_sub_id; + + vmci_trans(vsk)->notify_ops->process_negotiate(sk); + + return 0; + +destroy: + if (attach_sub_id != VMCI_INVALID_ID) + vmci_event_unsubscribe(attach_sub_id); + + if (detach_sub_id != VMCI_INVALID_ID) + vmci_event_unsubscribe(detach_sub_id); + + if (!vmci_handle_is_invalid(handle)) + vmci_qpair_detach(&qpair); + + return err; +} + +static int +vmci_transport_recv_connecting_client_invalid(struct sock *sk, + struct vmci_transport_packet *pkt) +{ + int err = 0; + struct vsock_sock *vsk = vsock_sk(sk); + + if (vsk->sent_request) { + vsk->sent_request = false; + vsk->ignore_connecting_rst = true; + + err = vmci_transport_send_conn_request( + sk, vmci_trans(vsk)->queue_pair_size); + if (err < 0) + err = vmci_transport_error_to_vsock_error(err); + else + err = 0; + + } + + return err; +} + +static int vmci_transport_recv_connected(struct sock *sk, + struct vmci_transport_packet *pkt) +{ + struct vsock_sock *vsk; + bool pkt_processed = false; + + /* In cases where we are closing the connection, it's sufficient to + * mark the state change (and maybe error) and wake up any waiting + * threads. Since this is a connected socket, it's owned by a user + * process and will be cleaned up when the failure is passed back on + * the current or next system call. Our system call implementations + * must therefore check for error and state changes on entry and when + * being awoken. + */ + switch (pkt->type) { + case VMCI_TRANSPORT_PACKET_TYPE_SHUTDOWN: + if (pkt->u.mode) { + vsk = vsock_sk(sk); + + vsk->peer_shutdown |= pkt->u.mode; + sk->sk_state_change(sk); + } + break; + + case VMCI_TRANSPORT_PACKET_TYPE_RST: + vsk = vsock_sk(sk); + /* It is possible that we sent our peer a message (e.g a + * WAITING_READ) right before we got notified that the peer had + * detached. If that happens then we can get a RST pkt back + * from our peer even though there is data available for us to + * read. In that case, don't shutdown the socket completely but + * instead allow the local client to finish reading data off + * the queuepair. Always treat a RST pkt in connected mode like + * a clean shutdown. + */ + sock_set_flag(sk, SOCK_DONE); + vsk->peer_shutdown = SHUTDOWN_MASK; + if (vsock_stream_has_data(vsk) <= 0) + sk->sk_state = SS_DISCONNECTING; + + sk->sk_state_change(sk); + break; + + default: + vsk = vsock_sk(sk); + vmci_trans(vsk)->notify_ops->handle_notify_pkt( + sk, pkt, false, NULL, NULL, + &pkt_processed); + if (!pkt_processed) + return -EINVAL; + + break; + } + + return 0; +} + +static int vmci_transport_socket_init(struct vsock_sock *vsk, + struct vsock_sock *psk) +{ + vsk->trans = kmalloc(sizeof(struct vmci_transport), GFP_KERNEL); + if (!vsk->trans) + return -ENOMEM; + + vmci_trans(vsk)->dg_handle = VMCI_INVALID_HANDLE; + vmci_trans(vsk)->qp_handle = VMCI_INVALID_HANDLE; + vmci_trans(vsk)->qpair = NULL; + vmci_trans(vsk)->produce_size = vmci_trans(vsk)->consume_size = 0; + vmci_trans(vsk)->attach_sub_id = vmci_trans(vsk)->detach_sub_id = + VMCI_INVALID_ID; + vmci_trans(vsk)->notify_ops = NULL; + if (psk) { + vmci_trans(vsk)->queue_pair_size = + vmci_trans(psk)->queue_pair_size; + vmci_trans(vsk)->queue_pair_min_size = + vmci_trans(psk)->queue_pair_min_size; + vmci_trans(vsk)->queue_pair_max_size = + vmci_trans(psk)->queue_pair_max_size; + } else { + vmci_trans(vsk)->queue_pair_size = + VMCI_TRANSPORT_DEFAULT_QP_SIZE; + vmci_trans(vsk)->queue_pair_min_size = + VMCI_TRANSPORT_DEFAULT_QP_SIZE_MIN; + vmci_trans(vsk)->queue_pair_max_size = + VMCI_TRANSPORT_DEFAULT_QP_SIZE_MAX; + } + + return 0; +} + +static void vmci_transport_destruct(struct vsock_sock *vsk) +{ + if (vmci_trans(vsk)->attach_sub_id != VMCI_INVALID_ID) { + vmci_event_unsubscribe(vmci_trans(vsk)->attach_sub_id); + vmci_trans(vsk)->attach_sub_id = VMCI_INVALID_ID; + } + + if (vmci_trans(vsk)->detach_sub_id != VMCI_INVALID_ID) { + vmci_event_unsubscribe(vmci_trans(vsk)->detach_sub_id); + vmci_trans(vsk)->detach_sub_id = VMCI_INVALID_ID; + } + + if (!vmci_handle_is_invalid(vmci_trans(vsk)->qp_handle)) { + vmci_qpair_detach(&vmci_trans(vsk)->qpair); + vmci_trans(vsk)->qp_handle = VMCI_INVALID_HANDLE; + vmci_trans(vsk)->produce_size = 0; + vmci_trans(vsk)->consume_size = 0; + } + + if (vmci_trans(vsk)->notify_ops) + vmci_trans(vsk)->notify_ops->socket_destruct(vsk); + + kfree(vsk->trans); + vsk->trans = NULL; +} + +static void vmci_transport_release(struct vsock_sock *vsk) +{ + if (!vmci_handle_is_invalid(vmci_trans(vsk)->dg_handle)) { + vmci_datagram_destroy_handle(vmci_trans(vsk)->dg_handle); + vmci_trans(vsk)->dg_handle = VMCI_INVALID_HANDLE; + } +} + +static int vmci_transport_dgram_bind(struct vsock_sock *vsk, + struct sockaddr_vm *addr) +{ + u32 port; + u32 flags; + int err; + + /* VMCI will select a resource ID for us if we provide + * VMCI_INVALID_ID. + */ + port = addr->svm_port == VMADDR_PORT_ANY ? + VMCI_INVALID_ID : addr->svm_port; + + if (port <= LAST_RESERVED_PORT && !capable(CAP_NET_BIND_SERVICE)) + return -EACCES; + + flags = addr->svm_cid == VMADDR_CID_ANY ? + VMCI_FLAG_ANYCID_DG_HND : 0; + + err = vmci_transport_datagram_create_hnd(port, flags, + vmci_transport_recv_dgram_cb, + &vsk->sk, + &vmci_trans(vsk)->dg_handle); + if (err < VMCI_SUCCESS) + return vmci_transport_error_to_vsock_error(err); + vsock_addr_init(&vsk->local_addr, addr->svm_cid, + vmci_trans(vsk)->dg_handle.resource); + + return 0; +} + +static int vmci_transport_dgram_enqueue( + struct vsock_sock *vsk, + struct sockaddr_vm *remote_addr, + struct iovec *iov, + size_t len) +{ + int err; + struct vmci_datagram *dg; + + if (len > VMCI_MAX_DG_PAYLOAD_SIZE) + return -EMSGSIZE; + + if (!vmci_transport_allow_dgram(vsk, remote_addr->svm_cid)) + return -EPERM; + + /* Allocate a buffer for the user's message and our packet header. */ + dg = kmalloc(len + sizeof(*dg), GFP_KERNEL); + if (!dg) + return -ENOMEM; + + memcpy_fromiovec(VMCI_DG_PAYLOAD(dg), iov, len); + + dg->dst = vmci_make_handle(remote_addr->svm_cid, + remote_addr->svm_port); + dg->src = vmci_make_handle(vsk->local_addr.svm_cid, + vsk->local_addr.svm_port); + dg->payload_size = len; + + err = vmci_datagram_send(dg); + kfree(dg); + if (err < 0) + return vmci_transport_error_to_vsock_error(err); + + return err - sizeof(*dg); +} + +static int vmci_transport_dgram_dequeue(struct kiocb *kiocb, + struct vsock_sock *vsk, + struct msghdr *msg, size_t len, + int flags) +{ + int err; + int noblock; + struct vmci_datagram *dg; + size_t payload_len; + struct sk_buff *skb; + + noblock = flags & MSG_DONTWAIT; + + if (flags & MSG_OOB || flags & MSG_ERRQUEUE) + return -EOPNOTSUPP; + + /* Retrieve the head sk_buff from the socket's receive queue. */ + err = 0; + skb = skb_recv_datagram(&vsk->sk, flags, noblock, &err); + if (err) + return err; + + if (!skb) + return -EAGAIN; + + dg = (struct vmci_datagram *)skb->data; + if (!dg) + /* err is 0, meaning we read zero bytes. */ + goto out; + + payload_len = dg->payload_size; + /* Ensure the sk_buff matches the payload size claimed in the packet. */ + if (payload_len != skb->len - sizeof(*dg)) { + err = -EINVAL; + goto out; + } + + if (payload_len > len) { + payload_len = len; + msg->msg_flags |= MSG_TRUNC; + } + + /* Place the datagram payload in the user's iovec. */ + err = skb_copy_datagram_iovec(skb, sizeof(*dg), msg->msg_iov, + payload_len); + if (err) + goto out; + + msg->msg_namelen = 0; + if (msg->msg_name) { + struct sockaddr_vm *vm_addr; + + /* Provide the address of the sender. */ + vm_addr = (struct sockaddr_vm *)msg->msg_name; + vsock_addr_init(vm_addr, dg->src.context, dg->src.resource); + msg->msg_namelen = sizeof(*vm_addr); + } + err = payload_len; + +out: + skb_free_datagram(&vsk->sk, skb); + return err; +} + +static bool vmci_transport_dgram_allow(u32 cid, u32 port) +{ + if (cid == VMADDR_CID_HYPERVISOR) { + /* Registrations of PBRPC Servers do not modify VMX/Hypervisor + * state and are allowed. + */ + return port == VMCI_UNITY_PBRPC_REGISTER; + } + + return true; +} + +static int vmci_transport_connect(struct vsock_sock *vsk) +{ + int err; + bool old_pkt_proto = false; + struct sock *sk = &vsk->sk; + + if (vmci_transport_old_proto_override(&old_pkt_proto) && + old_pkt_proto) { + err = vmci_transport_send_conn_request( + sk, vmci_trans(vsk)->queue_pair_size); + if (err < 0) { + sk->sk_state = SS_UNCONNECTED; + return err; + } + } else { + int supported_proto_versions = + vmci_transport_new_proto_supported_versions(); + err = vmci_transport_send_conn_request2( + sk, vmci_trans(vsk)->queue_pair_size, + supported_proto_versions); + if (err < 0) { + sk->sk_state = SS_UNCONNECTED; + return err; + } + + vsk->sent_request = true; + } + + return err; +} + +static ssize_t vmci_transport_stream_dequeue( + struct vsock_sock *vsk, + struct iovec *iov, + size_t len, + int flags) +{ + if (flags & MSG_PEEK) + return vmci_qpair_peekv(vmci_trans(vsk)->qpair, iov, len, 0); + else + return vmci_qpair_dequev(vmci_trans(vsk)->qpair, iov, len, 0); +} + +static ssize_t vmci_transport_stream_enqueue( + struct vsock_sock *vsk, + struct iovec *iov, + size_t len) +{ + return vmci_qpair_enquev(vmci_trans(vsk)->qpair, iov, len, 0); +} + +static s64 vmci_transport_stream_has_data(struct vsock_sock *vsk) +{ + return vmci_qpair_consume_buf_ready(vmci_trans(vsk)->qpair); +} + +static s64 vmci_transport_stream_has_space(struct vsock_sock *vsk) +{ + return vmci_qpair_produce_free_space(vmci_trans(vsk)->qpair); +} + +static u64 vmci_transport_stream_rcvhiwat(struct vsock_sock *vsk) +{ + return vmci_trans(vsk)->consume_size; +} + +static bool vmci_transport_stream_is_active(struct vsock_sock *vsk) +{ + return !vmci_handle_is_invalid(vmci_trans(vsk)->qp_handle); +} + +static u64 vmci_transport_get_buffer_size(struct vsock_sock *vsk) +{ + return vmci_trans(vsk)->queue_pair_size; +} + +static u64 vmci_transport_get_min_buffer_size(struct vsock_sock *vsk) +{ + return vmci_trans(vsk)->queue_pair_min_size; +} + +static u64 vmci_transport_get_max_buffer_size(struct vsock_sock *vsk) +{ + return vmci_trans(vsk)->queue_pair_max_size; +} + +static void vmci_transport_set_buffer_size(struct vsock_sock *vsk, u64 val) +{ + if (val < vmci_trans(vsk)->queue_pair_min_size) + vmci_trans(vsk)->queue_pair_min_size = val; + if (val > vmci_trans(vsk)->queue_pair_max_size) + vmci_trans(vsk)->queue_pair_max_size = val; + vmci_trans(vsk)->queue_pair_size = val; +} + +static void vmci_transport_set_min_buffer_size(struct vsock_sock *vsk, + u64 val) +{ + if (val > vmci_trans(vsk)->queue_pair_size) + vmci_trans(vsk)->queue_pair_size = val; + vmci_trans(vsk)->queue_pair_min_size = val; +} + +static void vmci_transport_set_max_buffer_size(struct vsock_sock *vsk, + u64 val) +{ + if (val < vmci_trans(vsk)->queue_pair_size) + vmci_trans(vsk)->queue_pair_size = val; + vmci_trans(vsk)->queue_pair_max_size = val; +} + +static int vmci_transport_notify_poll_in( + struct vsock_sock *vsk, + size_t target, + bool *data_ready_now) +{ + return vmci_trans(vsk)->notify_ops->poll_in( + &vsk->sk, target, data_ready_now); +} + +static int vmci_transport_notify_poll_out( + struct vsock_sock *vsk, + size_t target, + bool *space_available_now) +{ + return vmci_trans(vsk)->notify_ops->poll_out( + &vsk->sk, target, space_available_now); +} + +static int vmci_transport_notify_recv_init( + struct vsock_sock *vsk, + size_t target, + struct vsock_transport_recv_notify_data *data) +{ + return vmci_trans(vsk)->notify_ops->recv_init( + &vsk->sk, target, + (struct vmci_transport_recv_notify_data *)data); +} + +static int vmci_transport_notify_recv_pre_block( + struct vsock_sock *vsk, + size_t target, + struct vsock_transport_recv_notify_data *data) +{ + return vmci_trans(vsk)->notify_ops->recv_pre_block( + &vsk->sk, target, + (struct vmci_transport_recv_notify_data *)data); +} + +static int vmci_transport_notify_recv_pre_dequeue( + struct vsock_sock *vsk, + size_t target, + struct vsock_transport_recv_notify_data *data) +{ + return vmci_trans(vsk)->notify_ops->recv_pre_dequeue( + &vsk->sk, target, + (struct vmci_transport_recv_notify_data *)data); +} + +static int vmci_transport_notify_recv_post_dequeue( + struct vsock_sock *vsk, + size_t target, + ssize_t copied, + bool data_read, + struct vsock_transport_recv_notify_data *data) +{ + return vmci_trans(vsk)->notify_ops->recv_post_dequeue( + &vsk->sk, target, copied, data_read, + (struct vmci_transport_recv_notify_data *)data); +} + +static int vmci_transport_notify_send_init( + struct vsock_sock *vsk, + struct vsock_transport_send_notify_data *data) +{ + return vmci_trans(vsk)->notify_ops->send_init( + &vsk->sk, + (struct vmci_transport_send_notify_data *)data); +} + +static int vmci_transport_notify_send_pre_block( + struct vsock_sock *vsk, + struct vsock_transport_send_notify_data *data) +{ + return vmci_trans(vsk)->notify_ops->send_pre_block( + &vsk->sk, + (struct vmci_transport_send_notify_data *)data); +} + +static int vmci_transport_notify_send_pre_enqueue( + struct vsock_sock *vsk, + struct vsock_transport_send_notify_data *data) +{ + return vmci_trans(vsk)->notify_ops->send_pre_enqueue( + &vsk->sk, + (struct vmci_transport_send_notify_data *)data); +} + +static int vmci_transport_notify_send_post_enqueue( + struct vsock_sock *vsk, + ssize_t written, + struct vsock_transport_send_notify_data *data) +{ + return vmci_trans(vsk)->notify_ops->send_post_enqueue( + &vsk->sk, written, + (struct vmci_transport_send_notify_data *)data); +} + +static bool vmci_transport_old_proto_override(bool *old_pkt_proto) +{ + if (PROTOCOL_OVERRIDE != -1) { + if (PROTOCOL_OVERRIDE == 0) + *old_pkt_proto = true; + else + *old_pkt_proto = false; + + pr_info("Proto override in use\n"); + return true; + } + + return false; +} + +static bool vmci_transport_proto_to_notify_struct(struct sock *sk, + u16 *proto, + bool old_pkt_proto) +{ + struct vsock_sock *vsk = vsock_sk(sk); + + if (old_pkt_proto) { + if (*proto != VSOCK_PROTO_INVALID) { + pr_err("Can't set both an old and new protocol\n"); + return false; + } + vmci_trans(vsk)->notify_ops = &vmci_transport_notify_pkt_ops; + goto exit; + } + + switch (*proto) { + case VSOCK_PROTO_PKT_ON_NOTIFY: + vmci_trans(vsk)->notify_ops = + &vmci_transport_notify_pkt_q_state_ops; + break; + default: + pr_err("Unknown notify protocol version\n"); + return false; + } + +exit: + vmci_trans(vsk)->notify_ops->socket_init(sk); + return true; +} + +static u16 vmci_transport_new_proto_supported_versions(void) +{ + if (PROTOCOL_OVERRIDE != -1) + return PROTOCOL_OVERRIDE; + + return VSOCK_PROTO_ALL_SUPPORTED; +} + +static u32 vmci_transport_get_local_cid(void) +{ + return vmci_get_context_id(); +} + +static struct vsock_transport vmci_transport = { + .init = vmci_transport_socket_init, + .destruct = vmci_transport_destruct, + .release = vmci_transport_release, + .connect = vmci_transport_connect, + .dgram_bind = vmci_transport_dgram_bind, + .dgram_dequeue = vmci_transport_dgram_dequeue, + .dgram_enqueue = vmci_transport_dgram_enqueue, + .dgram_allow = vmci_transport_dgram_allow, + .stream_dequeue = vmci_transport_stream_dequeue, + .stream_enqueue = vmci_transport_stream_enqueue, + .stream_has_data = vmci_transport_stream_has_data, + .stream_has_space = vmci_transport_stream_has_space, + .stream_rcvhiwat = vmci_transport_stream_rcvhiwat, + .stream_is_active = vmci_transport_stream_is_active, + .stream_allow = vmci_transport_stream_allow, + .notify_poll_in = vmci_transport_notify_poll_in, + .notify_poll_out = vmci_transport_notify_poll_out, + .notify_recv_init = vmci_transport_notify_recv_init, + .notify_recv_pre_block = vmci_transport_notify_recv_pre_block, + .notify_recv_pre_dequeue = vmci_transport_notify_recv_pre_dequeue, + .notify_recv_post_dequeue = vmci_transport_notify_recv_post_dequeue, + .notify_send_init = vmci_transport_notify_send_init, + .notify_send_pre_block = vmci_transport_notify_send_pre_block, + .notify_send_pre_enqueue = vmci_transport_notify_send_pre_enqueue, + .notify_send_post_enqueue = vmci_transport_notify_send_post_enqueue, + .shutdown = vmci_transport_shutdown, + .set_buffer_size = vmci_transport_set_buffer_size, + .set_min_buffer_size = vmci_transport_set_min_buffer_size, + .set_max_buffer_size = vmci_transport_set_max_buffer_size, + .get_buffer_size = vmci_transport_get_buffer_size, + .get_min_buffer_size = vmci_transport_get_min_buffer_size, + .get_max_buffer_size = vmci_transport_get_max_buffer_size, + .get_local_cid = vmci_transport_get_local_cid, +}; + +static int __init vmci_transport_init(void) +{ + int err; + + /* Create the datagram handle that we will use to send and receive all + * VSocket control messages for this context. + */ + err = vmci_transport_datagram_create_hnd(VMCI_TRANSPORT_PACKET_RID, + VMCI_FLAG_ANYCID_DG_HND, + vmci_transport_recv_stream_cb, + NULL, + &vmci_transport_stream_handle); + if (err < VMCI_SUCCESS) { + pr_err("Unable to create datagram handle. (%d)\n", err); + return vmci_transport_error_to_vsock_error(err); + } + + err = vmci_event_subscribe(VMCI_EVENT_QP_RESUMED, + vmci_transport_qp_resumed_cb, + NULL, &vmci_transport_qp_resumed_sub_id); + if (err < VMCI_SUCCESS) { + pr_err("Unable to subscribe to resumed event. (%d)\n", err); + err = vmci_transport_error_to_vsock_error(err); + vmci_transport_qp_resumed_sub_id = VMCI_INVALID_ID; + goto err_destroy_stream_handle; + } + + err = vsock_core_init(&vmci_transport); + if (err < 0) + goto err_unsubscribe; + + return 0; + +err_unsubscribe: + vmci_event_unsubscribe(vmci_transport_qp_resumed_sub_id); +err_destroy_stream_handle: + vmci_datagram_destroy_handle(vmci_transport_stream_handle); + return err; +} +module_init(vmci_transport_init); + +static void __exit vmci_transport_exit(void) +{ + if (!vmci_handle_is_invalid(vmci_transport_stream_handle)) { + if (vmci_datagram_destroy_handle( + vmci_transport_stream_handle) != VMCI_SUCCESS) + pr_err("Couldn't destroy datagram handle\n"); + vmci_transport_stream_handle = VMCI_INVALID_HANDLE; + } + + if (vmci_transport_qp_resumed_sub_id != VMCI_INVALID_ID) { + vmci_event_unsubscribe(vmci_transport_qp_resumed_sub_id); + vmci_transport_qp_resumed_sub_id = VMCI_INVALID_ID; + } + + vsock_core_exit(); +} +module_exit(vmci_transport_exit); + +MODULE_AUTHOR("VMware, Inc."); +MODULE_DESCRIPTION("VMCI transport for Virtual Sockets"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("vmware_vsock"); +MODULE_ALIAS_NETPROTO(PF_VSOCK); diff --git a/net/vmw_vsock/vmci_transport.h b/net/vmw_vsock/vmci_transport.h new file mode 100644 index 0000000..1bf9918 --- /dev/null +++ b/net/vmw_vsock/vmci_transport.h @@ -0,0 +1,139 @@ +/* + * VMware vSockets Driver + * + * Copyright (C) 2013 VMware, Inc. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation version 2 and no later version. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + */ + +#ifndef _VMCI_TRANSPORT_H_ +#define _VMCI_TRANSPORT_H_ + +#include <linux/vmw_vmci_defs.h> +#include <linux/vmw_vmci_api.h> + +#include "vsock_addr.h" +#include "af_vsock.h" + +/* If the packet format changes in a release then this should change too. */ +#define VMCI_TRANSPORT_PACKET_VERSION 1 + +/* The resource ID on which control packets are sent. */ +#define VMCI_TRANSPORT_PACKET_RID 1 + +#define VSOCK_PROTO_INVALID 0 +#define VSOCK_PROTO_PKT_ON_NOTIFY (1 << 0) +#define VSOCK_PROTO_ALL_SUPPORTED (VSOCK_PROTO_PKT_ON_NOTIFY) + +#define vmci_trans(_vsk) ((struct vmci_transport *)((_vsk)->trans)) + +enum vmci_transport_packet_type { + VMCI_TRANSPORT_PACKET_TYPE_INVALID = 0, + VMCI_TRANSPORT_PACKET_TYPE_REQUEST, + VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE, + VMCI_TRANSPORT_PACKET_TYPE_OFFER, + VMCI_TRANSPORT_PACKET_TYPE_ATTACH, + VMCI_TRANSPORT_PACKET_TYPE_WROTE, + VMCI_TRANSPORT_PACKET_TYPE_READ, + VMCI_TRANSPORT_PACKET_TYPE_RST, + VMCI_TRANSPORT_PACKET_TYPE_SHUTDOWN, + VMCI_TRANSPORT_PACKET_TYPE_WAITING_WRITE, + VMCI_TRANSPORT_PACKET_TYPE_WAITING_READ, + VMCI_TRANSPORT_PACKET_TYPE_REQUEST2, + VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE2, + VMCI_TRANSPORT_PACKET_TYPE_MAX +}; + +struct vmci_transport_waiting_info { + u64 generation; + u64 offset; +}; + +/* Control packet type for STREAM sockets. DGRAMs have no control packets nor + * special packet header for data packets, they are just raw VMCI DGRAM + * messages. For STREAMs, control packets are sent over the control channel + * while data is written and read directly from queue pairs with no packet + * format. + */ +struct vmci_transport_packet { + struct vmci_datagram dg; + u8 version; + u8 type; + u16 proto; + u32 src_port; + u32 dst_port; + u32 _reserved2; + union { + u64 size; + u64 mode; + struct vmci_handle handle; + struct vmci_transport_waiting_info wait; + } u; +}; + +struct vmci_transport_notify_pkt { + u64 write_notify_window; + u64 write_notify_min_window; + bool peer_waiting_read; + bool peer_waiting_write; + bool peer_waiting_write_detected; + bool sent_waiting_read; + bool sent_waiting_write; + struct vmci_transport_waiting_info peer_waiting_read_info; + struct vmci_transport_waiting_info peer_waiting_write_info; + u64 produce_q_generation; + u64 consume_q_generation; +}; + +struct vmci_transport_notify_pkt_q_state { + u64 write_notify_window; + u64 write_notify_min_window; + bool peer_waiting_write; + bool peer_waiting_write_detected; +}; + +union vmci_transport_notify { + struct vmci_transport_notify_pkt pkt; + struct vmci_transport_notify_pkt_q_state pkt_q_state; +}; + +/* Our transport-specific data. */ +struct vmci_transport { + /* For DGRAMs. */ + struct vmci_handle dg_handle; + /* For STREAMs. */ + struct vmci_handle qp_handle; + struct vmci_qp *qpair; + u64 produce_size; + u64 consume_size; + u64 queue_pair_size; + u64 queue_pair_min_size; + u64 queue_pair_max_size; + u32 attach_sub_id; + u32 detach_sub_id; + union vmci_transport_notify notify; + struct vmci_transport_notify_ops *notify_ops; +}; + +int vmci_transport_register(void); +void vmci_transport_unregister(void); + +int vmci_transport_send_wrote_bh(struct sockaddr_vm *dst, + struct sockaddr_vm *src); +int vmci_transport_send_read_bh(struct sockaddr_vm *dst, + struct sockaddr_vm *src); +int vmci_transport_send_wrote(struct sock *sk); +int vmci_transport_send_read(struct sock *sk); +int vmci_transport_send_waiting_write(struct sock *sk, + struct vmci_transport_waiting_info *wait); +int vmci_transport_send_waiting_read(struct sock *sk, + struct vmci_transport_waiting_info *wait); + +#endif diff --git a/net/vmw_vsock/vmci_transport_notify.c b/net/vmw_vsock/vmci_transport_notify.c new file mode 100644 index 0000000..9a73074 --- /dev/null +++ b/net/vmw_vsock/vmci_transport_notify.c @@ -0,0 +1,680 @@ +/* + * VMware vSockets Driver + * + * Copyright (C) 2009-2013 VMware, Inc. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation version 2 and no later version. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + */ + +#include <linux/types.h> +#include <linux/socket.h> +#include <linux/stddef.h> +#include <net/sock.h> + +#include "vmci_transport_notify.h" + +#define PKT_FIELD(vsk, field_name) (vmci_trans(vsk)->notify.pkt.field_name) + +static bool vmci_transport_notify_waiting_write(struct vsock_sock *vsk) +{ +#if defined(VSOCK_OPTIMIZATION_WAITING_NOTIFY) + bool retval; + u64 notify_limit; + + if (!PKT_FIELD(vsk, peer_waiting_write)) + return false; + +#ifdef VSOCK_OPTIMIZATION_FLOW_CONTROL + /* When the sender blocks, we take that as a sign that the sender is + * faster than the receiver. To reduce the transmit rate of the sender, + * we delay the sending of the read notification by decreasing the + * write_notify_window. The notification is delayed until the number of + * bytes used in the queue drops below the write_notify_window. + */ + + if (!PKT_FIELD(vsk, peer_waiting_write_detected)) { + PKT_FIELD(vsk, peer_waiting_write_detected) = true; + if (PKT_FIELD(vsk, write_notify_window) < PAGE_SIZE) { + PKT_FIELD(vsk, write_notify_window) = + PKT_FIELD(vsk, write_notify_min_window); + } else { + PKT_FIELD(vsk, write_notify_window) -= PAGE_SIZE; + if (PKT_FIELD(vsk, write_notify_window) < + PKT_FIELD(vsk, write_notify_min_window)) + PKT_FIELD(vsk, write_notify_window) = + PKT_FIELD(vsk, write_notify_min_window); + + } + } + notify_limit = vmci_trans(vsk)->consume_size - + PKT_FIELD(vsk, write_notify_window); +#else + notify_limit = 0; +#endif + + /* For now we ignore the wait information and just see if the free + * space exceeds the notify limit. Note that improving this function + * to be more intelligent will not require a protocol change and will + * retain compatibility between endpoints with mixed versions of this + * function. + * + * The notify_limit is used to delay notifications in the case where + * flow control is enabled. Below the test is expressed in terms of + * free space in the queue: if free_space > ConsumeSize - + * write_notify_window then notify An alternate way of expressing this + * is to rewrite the expression to use the data ready in the receive + * queue: if write_notify_window > bufferReady then notify as + * free_space == ConsumeSize - bufferReady. + */ + retval = vmci_qpair_consume_free_space(vmci_trans(vsk)->qpair) > + notify_limit; +#ifdef VSOCK_OPTIMIZATION_FLOW_CONTROL + if (retval) { + /* + * Once we notify the peer, we reset the detected flag so the + * next wait will again cause a decrease in the window size. + */ + + PKT_FIELD(vsk, peer_waiting_write_detected) = false; + } +#endif + return retval; +#else + return true; +#endif +} + +static bool vmci_transport_notify_waiting_read(struct vsock_sock *vsk) +{ +#if defined(VSOCK_OPTIMIZATION_WAITING_NOTIFY) + if (!PKT_FIELD(vsk, peer_waiting_read)) + return false; + + /* For now we ignore the wait information and just see if there is any + * data for our peer to read. Note that improving this function to be + * more intelligent will not require a protocol change and will retain + * compatibility between endpoints with mixed versions of this + * function. + */ + return vmci_qpair_produce_buf_ready(vmci_trans(vsk)->qpair) > 0; +#else + return true; +#endif +} + +static void +vmci_transport_handle_waiting_read(struct sock *sk, + struct vmci_transport_packet *pkt, + bool bottom_half, + struct sockaddr_vm *dst, + struct sockaddr_vm *src) +{ +#if defined(VSOCK_OPTIMIZATION_WAITING_NOTIFY) + struct vsock_sock *vsk; + + vsk = vsock_sk(sk); + + PKT_FIELD(vsk, peer_waiting_read) = true; + memcpy(&PKT_FIELD(vsk, peer_waiting_read_info), &pkt->u.wait, + sizeof(PKT_FIELD(vsk, peer_waiting_read_info))); + + if (vmci_transport_notify_waiting_read(vsk)) { + bool sent; + + if (bottom_half) + sent = vmci_transport_send_wrote_bh(dst, src) > 0; + else + sent = vmci_transport_send_wrote(sk) > 0; + + if (sent) + PKT_FIELD(vsk, peer_waiting_read) = false; + } +#endif +} + +static void +vmci_transport_handle_waiting_write(struct sock *sk, + struct vmci_transport_packet *pkt, + bool bottom_half, + struct sockaddr_vm *dst, + struct sockaddr_vm *src) +{ +#if defined(VSOCK_OPTIMIZATION_WAITING_NOTIFY) + struct vsock_sock *vsk; + + vsk = vsock_sk(sk); + + PKT_FIELD(vsk, peer_waiting_write) = true; + memcpy(&PKT_FIELD(vsk, peer_waiting_write_info), &pkt->u.wait, + sizeof(PKT_FIELD(vsk, peer_waiting_write_info))); + + if (vmci_transport_notify_waiting_write(vsk)) { + bool sent; + + if (bottom_half) + sent = vmci_transport_send_read_bh(dst, src) > 0; + else + sent = vmci_transport_send_read(sk) > 0; + + if (sent) + PKT_FIELD(vsk, peer_waiting_write) = false; + } +#endif +} + +static void +vmci_transport_handle_read(struct sock *sk, + struct vmci_transport_packet *pkt, + bool bottom_half, + struct sockaddr_vm *dst, struct sockaddr_vm *src) +{ +#if defined(VSOCK_OPTIMIZATION_WAITING_NOTIFY) + struct vsock_sock *vsk; + + vsk = vsock_sk(sk); + PKT_FIELD(vsk, sent_waiting_write) = false; +#endif + + sk->sk_write_space(sk); +} + +static bool send_waiting_read(struct sock *sk, u64 room_needed) +{ +#if defined(VSOCK_OPTIMIZATION_WAITING_NOTIFY) + struct vsock_sock *vsk; + struct vmci_transport_waiting_info waiting_info; + u64 tail; + u64 head; + u64 room_left; + bool ret; + + vsk = vsock_sk(sk); + + if (PKT_FIELD(vsk, sent_waiting_read)) + return true; + + if (PKT_FIELD(vsk, write_notify_window) < + vmci_trans(vsk)->consume_size) + PKT_FIELD(vsk, write_notify_window) = + min(PKT_FIELD(vsk, write_notify_window) + PAGE_SIZE, + vmci_trans(vsk)->consume_size); + + vmci_qpair_get_consume_indexes(vmci_trans(vsk)->qpair, &tail, &head); + room_left = vmci_trans(vsk)->consume_size - head; + if (room_needed >= room_left) { + waiting_info.offset = room_needed - room_left; + waiting_info.generation = + PKT_FIELD(vsk, consume_q_generation) + 1; + } else { + waiting_info.offset = head + room_needed; + waiting_info.generation = PKT_FIELD(vsk, consume_q_generation); + } + + ret = vmci_transport_send_waiting_read(sk, &waiting_info) > 0; + if (ret) + PKT_FIELD(vsk, sent_waiting_read) = true; + + return ret; +#else + return true; +#endif +} + +static bool send_waiting_write(struct sock *sk, u64 room_needed) +{ +#if defined(VSOCK_OPTIMIZATION_WAITING_NOTIFY) + struct vsock_sock *vsk; + struct vmci_transport_waiting_info waiting_info; + u64 tail; + u64 head; + u64 room_left; + bool ret; + + vsk = vsock_sk(sk); + + if (PKT_FIELD(vsk, sent_waiting_write)) + return true; + + vmci_qpair_get_produce_indexes(vmci_trans(vsk)->qpair, &tail, &head); + room_left = vmci_trans(vsk)->produce_size - tail; + if (room_needed + 1 >= room_left) { + /* Wraps around to current generation. */ + waiting_info.offset = room_needed + 1 - room_left; + waiting_info.generation = PKT_FIELD(vsk, produce_q_generation); + } else { + waiting_info.offset = tail + room_needed + 1; + waiting_info.generation = + PKT_FIELD(vsk, produce_q_generation) - 1; + } + + ret = vmci_transport_send_waiting_write(sk, &waiting_info) > 0; + if (ret) + PKT_FIELD(vsk, sent_waiting_write) = true; + + return ret; +#else + return true; +#endif +} + +static int vmci_transport_send_read_notification(struct sock *sk) +{ + struct vsock_sock *vsk; + bool sent_read; + unsigned int retries; + int err; + + vsk = vsock_sk(sk); + sent_read = false; + retries = 0; + err = 0; + + if (vmci_transport_notify_waiting_write(vsk)) { + /* Notify the peer that we have read, retrying the send on + * failure up to our maximum value. XXX For now we just log + * the failure, but later we should schedule a work item to + * handle the resend until it succeeds. That would require + * keeping track of work items in the vsk and cleaning them up + * upon socket close. + */ + while (!(vsk->peer_shutdown & RCV_SHUTDOWN) && + !sent_read && + retries < VMCI_TRANSPORT_MAX_DGRAM_RESENDS) { + err = vmci_transport_send_read(sk); + if (err >= 0) + sent_read = true; + + retries++; + } + + if (retries >= VMCI_TRANSPORT_MAX_DGRAM_RESENDS) + pr_err("%p unable to send read notify to peer\n", sk); + else +#if defined(VSOCK_OPTIMIZATION_WAITING_NOTIFY) + PKT_FIELD(vsk, peer_waiting_write) = false; +#endif + + } + return err; +} + +static void +vmci_transport_handle_wrote(struct sock *sk, + struct vmci_transport_packet *pkt, + bool bottom_half, + struct sockaddr_vm *dst, struct sockaddr_vm *src) +{ +#if defined(VSOCK_OPTIMIZATION_WAITING_NOTIFY) + struct vsock_sock *vsk = vsock_sk(sk); + PKT_FIELD(vsk, sent_waiting_read) = false; +#endif + sk->sk_data_ready(sk, 0); +} + +static void vmci_transport_notify_pkt_socket_init(struct sock *sk) +{ + struct vsock_sock *vsk = vsock_sk(sk); + + PKT_FIELD(vsk, write_notify_window) = PAGE_SIZE; + PKT_FIELD(vsk, write_notify_min_window) = PAGE_SIZE; + PKT_FIELD(vsk, peer_waiting_read) = false; + PKT_FIELD(vsk, peer_waiting_write) = false; + PKT_FIELD(vsk, peer_waiting_write_detected) = false; + PKT_FIELD(vsk, sent_waiting_read) = false; + PKT_FIELD(vsk, sent_waiting_write) = false; + PKT_FIELD(vsk, produce_q_generation) = 0; + PKT_FIELD(vsk, consume_q_generation) = 0; + + memset(&PKT_FIELD(vsk, peer_waiting_read_info), 0, + sizeof(PKT_FIELD(vsk, peer_waiting_read_info))); + memset(&PKT_FIELD(vsk, peer_waiting_write_info), 0, + sizeof(PKT_FIELD(vsk, peer_waiting_write_info))); +} + +static void vmci_transport_notify_pkt_socket_destruct(struct vsock_sock *vsk) +{ +} + +static int +vmci_transport_notify_pkt_poll_in(struct sock *sk, + size_t target, bool *data_ready_now) +{ + struct vsock_sock *vsk = vsock_sk(sk); + + if (vsock_stream_has_data(vsk)) { + *data_ready_now = true; + } else { + /* We can't read right now because there is nothing in the + * queue. Ask for notifications when there is something to + * read. + */ + if (sk->sk_state == SS_CONNECTED) { + if (!send_waiting_read(sk, 1)) + return -1; + + } + *data_ready_now = false; + } + + return 0; +} + +static int +vmci_transport_notify_pkt_poll_out(struct sock *sk, + size_t target, bool *space_avail_now) +{ + s64 produce_q_free_space; + struct vsock_sock *vsk = vsock_sk(sk); + + produce_q_free_space = vsock_stream_has_space(vsk); + if (produce_q_free_space > 0) { + *space_avail_now = true; + return 0; + } else if (produce_q_free_space == 0) { + /* This is a connected socket but we can't currently send data. + * Notify the peer that we are waiting if the queue is full. We + * only send a waiting write if the queue is full because + * otherwise we end up in an infinite WAITING_WRITE, READ, + * WAITING_WRITE, READ, etc. loop. Treat failing to send the + * notification as a socket error, passing that back through + * the mask. + */ + if (!send_waiting_write(sk, 1)) + return -1; + + *space_avail_now = false; + } + + return 0; +} + +static int +vmci_transport_notify_pkt_recv_init( + struct sock *sk, + size_t target, + struct vmci_transport_recv_notify_data *data) +{ + struct vsock_sock *vsk = vsock_sk(sk); + +#ifdef VSOCK_OPTIMIZATION_WAITING_NOTIFY + data->consume_head = 0; + data->produce_tail = 0; +#ifdef VSOCK_OPTIMIZATION_FLOW_CONTROL + data->notify_on_block = false; + + if (PKT_FIELD(vsk, write_notify_min_window) < target + 1) { + PKT_FIELD(vsk, write_notify_min_window) = target + 1; + if (PKT_FIELD(vsk, write_notify_window) < + PKT_FIELD(vsk, write_notify_min_window)) { + /* If the current window is smaller than the new + * minimal window size, we need to reevaluate whether + * we need to notify the sender. If the number of ready + * bytes are smaller than the new window, we need to + * send a notification to the sender before we block. + */ + + PKT_FIELD(vsk, write_notify_window) = + PKT_FIELD(vsk, write_notify_min_window); + data->notify_on_block = true; + } + } +#endif +#endif + + return 0; +} + +static int +vmci_transport_notify_pkt_recv_pre_block( + struct sock *sk, + size_t target, + struct vmci_transport_recv_notify_data *data) +{ + int err = 0; + + /* Notify our peer that we are waiting for data to read. */ + if (!send_waiting_read(sk, target)) { + err = -EHOSTUNREACH; + return err; + } +#ifdef VSOCK_OPTIMIZATION_FLOW_CONTROL + if (data->notify_on_block) { + err = vmci_transport_send_read_notification(sk); + if (err < 0) + return err; + + data->notify_on_block = false; + } +#endif + + return err; +} + +static int +vmci_transport_notify_pkt_recv_pre_dequeue( + struct sock *sk, + size_t target, + struct vmci_transport_recv_notify_data *data) +{ + struct vsock_sock *vsk = vsock_sk(sk); + + /* Now consume up to len bytes from the queue. Note that since we have + * the socket locked we should copy at least ready bytes. + */ +#if defined(VSOCK_OPTIMIZATION_WAITING_NOTIFY) + vmci_qpair_get_consume_indexes(vmci_trans(vsk)->qpair, + &data->produce_tail, + &data->consume_head); +#endif + + return 0; +} + +static int +vmci_transport_notify_pkt_recv_post_dequeue( + struct sock *sk, + size_t target, + ssize_t copied, + bool data_read, + struct vmci_transport_recv_notify_data *data) +{ + struct vsock_sock *vsk; + int err; + + vsk = vsock_sk(sk); + err = 0; + + if (data_read) { +#if defined(VSOCK_OPTIMIZATION_WAITING_NOTIFY) + /* Detect a wrap-around to maintain queue generation. Note + * that this is safe since we hold the socket lock across the + * two queue pair operations. + */ + if (copied >= + vmci_trans(vsk)->consume_size - data->consume_head) + PKT_FIELD(vsk, consume_q_generation)++; +#endif + + err = vmci_transport_send_read_notification(sk); + if (err < 0) + return err; + + } + return err; +} + +static int +vmci_transport_notify_pkt_send_init( + struct sock *sk, + struct vmci_transport_send_notify_data *data) +{ +#ifdef VSOCK_OPTIMIZATION_WAITING_NOTIFY + data->consume_head = 0; + data->produce_tail = 0; +#endif + + return 0; +} + +static int +vmci_transport_notify_pkt_send_pre_block( + struct sock *sk, + struct vmci_transport_send_notify_data *data) +{ + /* Notify our peer that we are waiting for room to write. */ + if (!send_waiting_write(sk, 1)) + return -EHOSTUNREACH; + + return 0; +} + +static int +vmci_transport_notify_pkt_send_pre_enqueue( + struct sock *sk, + struct vmci_transport_send_notify_data *data) +{ + struct vsock_sock *vsk = vsock_sk(sk); + +#if defined(VSOCK_OPTIMIZATION_WAITING_NOTIFY) + vmci_qpair_get_produce_indexes(vmci_trans(vsk)->qpair, + &data->produce_tail, + &data->consume_head); +#endif + + return 0; +} + +static int +vmci_transport_notify_pkt_send_post_enqueue( + struct sock *sk, + ssize_t written, + struct vmci_transport_send_notify_data *data) +{ + int err = 0; + struct vsock_sock *vsk; + bool sent_wrote = false; + int retries = 0; + + vsk = vsock_sk(sk); + +#if defined(VSOCK_OPTIMIZATION_WAITING_NOTIFY) + /* Detect a wrap-around to maintain queue generation. Note that this + * is safe since we hold the socket lock across the two queue pair + * operations. + */ + if (written >= vmci_trans(vsk)->produce_size - data->produce_tail) + PKT_FIELD(vsk, produce_q_generation)++; + +#endif + + if (vmci_transport_notify_waiting_read(vsk)) { + /* Notify the peer that we have written, retrying the send on + * failure up to our maximum value. See the XXX comment for the + * corresponding piece of code in StreamRecvmsg() for potential + * improvements. + */ + while (!(vsk->peer_shutdown & RCV_SHUTDOWN) && + !sent_wrote && + retries < VMCI_TRANSPORT_MAX_DGRAM_RESENDS) { + err = vmci_transport_send_wrote(sk); + if (err >= 0) + sent_wrote = true; + + retries++; + } + + if (retries >= VMCI_TRANSPORT_MAX_DGRAM_RESENDS) { + pr_err("%p unable to send wrote notify to peer\n", sk); + return err; + } else { +#if defined(VSOCK_OPTIMIZATION_WAITING_NOTIFY) + PKT_FIELD(vsk, peer_waiting_read) = false; +#endif + } + } + return err; +} + +static void +vmci_transport_notify_pkt_handle_pkt( + struct sock *sk, + struct vmci_transport_packet *pkt, + bool bottom_half, + struct sockaddr_vm *dst, + struct sockaddr_vm *src, bool *pkt_processed) +{ + bool processed = false; + + switch (pkt->type) { + case VMCI_TRANSPORT_PACKET_TYPE_WROTE: + vmci_transport_handle_wrote(sk, pkt, bottom_half, dst, src); + processed = true; + break; + case VMCI_TRANSPORT_PACKET_TYPE_READ: + vmci_transport_handle_read(sk, pkt, bottom_half, dst, src); + processed = true; + break; + case VMCI_TRANSPORT_PACKET_TYPE_WAITING_WRITE: + vmci_transport_handle_waiting_write(sk, pkt, bottom_half, + dst, src); + processed = true; + break; + + case VMCI_TRANSPORT_PACKET_TYPE_WAITING_READ: + vmci_transport_handle_waiting_read(sk, pkt, bottom_half, + dst, src); + processed = true; + break; + } + + if (pkt_processed) + *pkt_processed = processed; +} + +static void vmci_transport_notify_pkt_process_request(struct sock *sk) +{ + struct vsock_sock *vsk = vsock_sk(sk); + + PKT_FIELD(vsk, write_notify_window) = vmci_trans(vsk)->consume_size; + if (vmci_trans(vsk)->consume_size < + PKT_FIELD(vsk, write_notify_min_window)) + PKT_FIELD(vsk, write_notify_min_window) = + vmci_trans(vsk)->consume_size; +} + +static void vmci_transport_notify_pkt_process_negotiate(struct sock *sk) +{ + struct vsock_sock *vsk = vsock_sk(sk); + + PKT_FIELD(vsk, write_notify_window) = vmci_trans(vsk)->consume_size; + if (vmci_trans(vsk)->consume_size < + PKT_FIELD(vsk, write_notify_min_window)) + PKT_FIELD(vsk, write_notify_min_window) = + vmci_trans(vsk)->consume_size; +} + +/* Socket control packet based operations. */ +struct vmci_transport_notify_ops vmci_transport_notify_pkt_ops = { + vmci_transport_notify_pkt_socket_init, + vmci_transport_notify_pkt_socket_destruct, + vmci_transport_notify_pkt_poll_in, + vmci_transport_notify_pkt_poll_out, + vmci_transport_notify_pkt_handle_pkt, + vmci_transport_notify_pkt_recv_init, + vmci_transport_notify_pkt_recv_pre_block, + vmci_transport_notify_pkt_recv_pre_dequeue, + vmci_transport_notify_pkt_recv_post_dequeue, + vmci_transport_notify_pkt_send_init, + vmci_transport_notify_pkt_send_pre_block, + vmci_transport_notify_pkt_send_pre_enqueue, + vmci_transport_notify_pkt_send_post_enqueue, + vmci_transport_notify_pkt_process_request, + vmci_transport_notify_pkt_process_negotiate, +}; diff --git a/net/vmw_vsock/vmci_transport_notify.h b/net/vmw_vsock/vmci_transport_notify.h new file mode 100644 index 0000000..7df7932 --- /dev/null +++ b/net/vmw_vsock/vmci_transport_notify.h @@ -0,0 +1,83 @@ +/* + * VMware vSockets Driver + * + * Copyright (C) 2009-2013 VMware, Inc. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation version 2 and no later version. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + */ + +#ifndef __VMCI_TRANSPORT_NOTIFY_H__ +#define __VMCI_TRANSPORT_NOTIFY_H__ + +#include <linux/types.h> +#include <linux/vmw_vmci_defs.h> +#include <linux/vmw_vmci_api.h> +#include <linux/vm_sockets.h> + +#include "vmci_transport.h" + +/* Comment this out to compare with old protocol. */ +#define VSOCK_OPTIMIZATION_WAITING_NOTIFY 1 +#if defined(VSOCK_OPTIMIZATION_WAITING_NOTIFY) +/* Comment this out to remove flow control for "new" protocol */ +#define VSOCK_OPTIMIZATION_FLOW_CONTROL 1 +#endif + +#define VMCI_TRANSPORT_MAX_DGRAM_RESENDS 10 + +struct vmci_transport_recv_notify_data { + u64 consume_head; + u64 produce_tail; + bool notify_on_block; +}; + +struct vmci_transport_send_notify_data { + u64 consume_head; + u64 produce_tail; +}; + +/* Socket notification callbacks. */ +struct vmci_transport_notify_ops { + void (*socket_init) (struct sock *sk); + void (*socket_destruct) (struct vsock_sock *vsk); + int (*poll_in) (struct sock *sk, size_t target, + bool *data_ready_now); + int (*poll_out) (struct sock *sk, size_t target, + bool *space_avail_now); + void (*handle_notify_pkt) (struct sock *sk, + struct vmci_transport_packet *pkt, + bool bottom_half, struct sockaddr_vm *dst, + struct sockaddr_vm *src, + bool *pkt_processed); + int (*recv_init) (struct sock *sk, size_t target, + struct vmci_transport_recv_notify_data *data); + int (*recv_pre_block) (struct sock *sk, size_t target, + struct vmci_transport_recv_notify_data *data); + int (*recv_pre_dequeue) (struct sock *sk, size_t target, + struct vmci_transport_recv_notify_data *data); + int (*recv_post_dequeue) (struct sock *sk, size_t target, + ssize_t copied, bool data_read, + struct vmci_transport_recv_notify_data *data); + int (*send_init) (struct sock *sk, + struct vmci_transport_send_notify_data *data); + int (*send_pre_block) (struct sock *sk, + struct vmci_transport_send_notify_data *data); + int (*send_pre_enqueue) (struct sock *sk, + struct vmci_transport_send_notify_data *data); + int (*send_post_enqueue) (struct sock *sk, ssize_t written, + struct vmci_transport_send_notify_data *data); + void (*process_request) (struct sock *sk); + void (*process_negotiate) (struct sock *sk); +}; + +extern struct vmci_transport_notify_ops vmci_transport_notify_pkt_ops; +extern struct vmci_transport_notify_ops vmci_transport_notify_pkt_q_state_ops; + +#endif /* __VMCI_TRANSPORT_NOTIFY_H__ */ diff --git a/net/vmw_vsock/vmci_transport_notify_qstate.c b/net/vmw_vsock/vmci_transport_notify_qstate.c new file mode 100644 index 0000000..622bd7a --- /dev/null +++ b/net/vmw_vsock/vmci_transport_notify_qstate.c @@ -0,0 +1,438 @@ +/* + * VMware vSockets Driver + * + * Copyright (C) 2009-2013 VMware, Inc. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation version 2 and no later version. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + */ + +#include <linux/types.h> +#include <linux/socket.h> +#include <linux/stddef.h> +#include <net/sock.h> + +#include "vmci_transport_notify.h" + +#define PKT_FIELD(vsk, field_name) \ + (vmci_trans(vsk)->notify.pkt_q_state.field_name) + +static bool vmci_transport_notify_waiting_write(struct vsock_sock *vsk) +{ + bool retval; + u64 notify_limit; + + if (!PKT_FIELD(vsk, peer_waiting_write)) + return false; + + /* When the sender blocks, we take that as a sign that the sender is + * faster than the receiver. To reduce the transmit rate of the sender, + * we delay the sending of the read notification by decreasing the + * write_notify_window. The notification is delayed until the number of + * bytes used in the queue drops below the write_notify_window. + */ + + if (!PKT_FIELD(vsk, peer_waiting_write_detected)) { + PKT_FIELD(vsk, peer_waiting_write_detected) = true; + if (PKT_FIELD(vsk, write_notify_window) < PAGE_SIZE) { + PKT_FIELD(vsk, write_notify_window) = + PKT_FIELD(vsk, write_notify_min_window); + } else { + PKT_FIELD(vsk, write_notify_window) -= PAGE_SIZE; + if (PKT_FIELD(vsk, write_notify_window) < + PKT_FIELD(vsk, write_notify_min_window)) + PKT_FIELD(vsk, write_notify_window) = + PKT_FIELD(vsk, write_notify_min_window); + + } + } + notify_limit = vmci_trans(vsk)->consume_size - + PKT_FIELD(vsk, write_notify_window); + + /* The notify_limit is used to delay notifications in the case where + * flow control is enabled. Below the test is expressed in terms of + * free space in the queue: if free_space > ConsumeSize - + * write_notify_window then notify An alternate way of expressing this + * is to rewrite the expression to use the data ready in the receive + * queue: if write_notify_window > bufferReady then notify as + * free_space == ConsumeSize - bufferReady. + */ + + retval = vmci_qpair_consume_free_space(vmci_trans(vsk)->qpair) > + notify_limit; + + if (retval) { + /* Once we notify the peer, we reset the detected flag so the + * next wait will again cause a decrease in the window size. + */ + + PKT_FIELD(vsk, peer_waiting_write_detected) = false; + } + return retval; +} + +static void +vmci_transport_handle_read(struct sock *sk, + struct vmci_transport_packet *pkt, + bool bottom_half, + struct sockaddr_vm *dst, struct sockaddr_vm *src) +{ + sk->sk_write_space(sk); +} + +static void +vmci_transport_handle_wrote(struct sock *sk, + struct vmci_transport_packet *pkt, + bool bottom_half, + struct sockaddr_vm *dst, struct sockaddr_vm *src) +{ + sk->sk_data_ready(sk, 0); +} + +static void vsock_block_update_write_window(struct sock *sk) +{ + struct vsock_sock *vsk = vsock_sk(sk); + + if (PKT_FIELD(vsk, write_notify_window) < vmci_trans(vsk)->consume_size) + PKT_FIELD(vsk, write_notify_window) = + min(PKT_FIELD(vsk, write_notify_window) + PAGE_SIZE, + vmci_trans(vsk)->consume_size); +} + +static int vmci_transport_send_read_notification(struct sock *sk) +{ + struct vsock_sock *vsk; + bool sent_read; + unsigned int retries; + int err; + + vsk = vsock_sk(sk); + sent_read = false; + retries = 0; + err = 0; + + if (vmci_transport_notify_waiting_write(vsk)) { + /* Notify the peer that we have read, retrying the send on + * failure up to our maximum value. XXX For now we just log + * the failure, but later we should schedule a work item to + * handle the resend until it succeeds. That would require + * keeping track of work items in the vsk and cleaning them up + * upon socket close. + */ + while (!(vsk->peer_shutdown & RCV_SHUTDOWN) && + !sent_read && + retries < VMCI_TRANSPORT_MAX_DGRAM_RESENDS) { + err = vmci_transport_send_read(sk); + if (err >= 0) + sent_read = true; + + retries++; + } + + if (retries >= VMCI_TRANSPORT_MAX_DGRAM_RESENDS && !sent_read) + pr_err("%p unable to send read notification to peer\n", + sk); + else + PKT_FIELD(vsk, peer_waiting_write) = false; + + } + return err; +} + +static void vmci_transport_notify_pkt_socket_init(struct sock *sk) +{ + struct vsock_sock *vsk = vsock_sk(sk); + + PKT_FIELD(vsk, write_notify_window) = PAGE_SIZE; + PKT_FIELD(vsk, write_notify_min_window) = PAGE_SIZE; + PKT_FIELD(vsk, peer_waiting_write) = false; + PKT_FIELD(vsk, peer_waiting_write_detected) = false; +} + +static void vmci_transport_notify_pkt_socket_destruct(struct vsock_sock *vsk) +{ + PKT_FIELD(vsk, write_notify_window) = PAGE_SIZE; + PKT_FIELD(vsk, write_notify_min_window) = PAGE_SIZE; + PKT_FIELD(vsk, peer_waiting_write) = false; + PKT_FIELD(vsk, peer_waiting_write_detected) = false; +} + +static int +vmci_transport_notify_pkt_poll_in(struct sock *sk, + size_t target, bool *data_ready_now) +{ + struct vsock_sock *vsk = vsock_sk(sk); + + if (vsock_stream_has_data(vsk)) { + *data_ready_now = true; + } else { + /* We can't read right now because there is nothing in the + * queue. Ask for notifications when there is something to + * read. + */ + if (sk->sk_state == SS_CONNECTED) + vsock_block_update_write_window(sk); + *data_ready_now = false; + } + + return 0; +} + +static int +vmci_transport_notify_pkt_poll_out(struct sock *sk, + size_t target, bool *space_avail_now) +{ + s64 produce_q_free_space; + struct vsock_sock *vsk = vsock_sk(sk); + + produce_q_free_space = vsock_stream_has_space(vsk); + if (produce_q_free_space > 0) { + *space_avail_now = true; + return 0; + } else if (produce_q_free_space == 0) { + /* This is a connected socket but we can't currently send data. + * Nothing else to do. + */ + *space_avail_now = false; + } + + return 0; +} + +static int +vmci_transport_notify_pkt_recv_init( + struct sock *sk, + size_t target, + struct vmci_transport_recv_notify_data *data) +{ + struct vsock_sock *vsk = vsock_sk(sk); + + data->consume_head = 0; + data->produce_tail = 0; + data->notify_on_block = false; + + if (PKT_FIELD(vsk, write_notify_min_window) < target + 1) { + PKT_FIELD(vsk, write_notify_min_window) = target + 1; + if (PKT_FIELD(vsk, write_notify_window) < + PKT_FIELD(vsk, write_notify_min_window)) { + /* If the current window is smaller than the new + * minimal window size, we need to reevaluate whether + * we need to notify the sender. If the number of ready + * bytes are smaller than the new window, we need to + * send a notification to the sender before we block. + */ + + PKT_FIELD(vsk, write_notify_window) = + PKT_FIELD(vsk, write_notify_min_window); + data->notify_on_block = true; + } + } + + return 0; +} + +static int +vmci_transport_notify_pkt_recv_pre_block( + struct sock *sk, + size_t target, + struct vmci_transport_recv_notify_data *data) +{ + int err = 0; + + vsock_block_update_write_window(sk); + + if (data->notify_on_block) { + err = vmci_transport_send_read_notification(sk); + if (err < 0) + return err; + data->notify_on_block = false; + } + + return err; +} + +static int +vmci_transport_notify_pkt_recv_post_dequeue( + struct sock *sk, + size_t target, + ssize_t copied, + bool data_read, + struct vmci_transport_recv_notify_data *data) +{ + struct vsock_sock *vsk; + int err; + bool was_full = false; + u64 free_space; + + vsk = vsock_sk(sk); + err = 0; + + if (data_read) { + smp_mb(); + + free_space = + vmci_qpair_consume_free_space(vmci_trans(vsk)->qpair); + was_full = free_space == copied; + + if (was_full) + PKT_FIELD(vsk, peer_waiting_write) = true; + + err = vmci_transport_send_read_notification(sk); + if (err < 0) + return err; + + /* See the comment in + * vmci_transport_notify_pkt_send_post_enqueue(). + */ + sk->sk_data_ready(sk, 0); + } + + return err; +} + +static int +vmci_transport_notify_pkt_send_init( + struct sock *sk, + struct vmci_transport_send_notify_data *data) +{ + data->consume_head = 0; + data->produce_tail = 0; + + return 0; +} + +static int +vmci_transport_notify_pkt_send_post_enqueue( + struct sock *sk, + ssize_t written, + struct vmci_transport_send_notify_data *data) +{ + int err = 0; + struct vsock_sock *vsk; + bool sent_wrote = false; + bool was_empty; + int retries = 0; + + vsk = vsock_sk(sk); + + smp_mb(); + + was_empty = + vmci_qpair_produce_buf_ready(vmci_trans(vsk)->qpair) == written; + if (was_empty) { + while (!(vsk->peer_shutdown & RCV_SHUTDOWN) && + !sent_wrote && + retries < VMCI_TRANSPORT_MAX_DGRAM_RESENDS) { + err = vmci_transport_send_wrote(sk); + if (err >= 0) + sent_wrote = true; + + retries++; + } + } + + if (retries >= VMCI_TRANSPORT_MAX_DGRAM_RESENDS && !sent_wrote) { + pr_err("%p unable to send wrote notification to peer\n", + sk); + return err; + } + + return err; +} + +static void +vmci_transport_notify_pkt_handle_pkt( + struct sock *sk, + struct vmci_transport_packet *pkt, + bool bottom_half, + struct sockaddr_vm *dst, + struct sockaddr_vm *src, bool *pkt_processed) +{ + bool processed = false; + + switch (pkt->type) { + case VMCI_TRANSPORT_PACKET_TYPE_WROTE: + vmci_transport_handle_wrote(sk, pkt, bottom_half, dst, src); + processed = true; + break; + case VMCI_TRANSPORT_PACKET_TYPE_READ: + vmci_transport_handle_read(sk, pkt, bottom_half, dst, src); + processed = true; + break; + } + + if (pkt_processed) + *pkt_processed = processed; +} + +static void vmci_transport_notify_pkt_process_request(struct sock *sk) +{ + struct vsock_sock *vsk = vsock_sk(sk); + + PKT_FIELD(vsk, write_notify_window) = vmci_trans(vsk)->consume_size; + if (vmci_trans(vsk)->consume_size < + PKT_FIELD(vsk, write_notify_min_window)) + PKT_FIELD(vsk, write_notify_min_window) = + vmci_trans(vsk)->consume_size; +} + +static void vmci_transport_notify_pkt_process_negotiate(struct sock *sk) +{ + struct vsock_sock *vsk = vsock_sk(sk); + + PKT_FIELD(vsk, write_notify_window) = vmci_trans(vsk)->consume_size; + if (vmci_trans(vsk)->consume_size < + PKT_FIELD(vsk, write_notify_min_window)) + PKT_FIELD(vsk, write_notify_min_window) = + vmci_trans(vsk)->consume_size; +} + +static int +vmci_transport_notify_pkt_recv_pre_dequeue( + struct sock *sk, + size_t target, + struct vmci_transport_recv_notify_data *data) +{ + return 0; /* NOP for QState. */ +} + +static int +vmci_transport_notify_pkt_send_pre_block( + struct sock *sk, + struct vmci_transport_send_notify_data *data) +{ + return 0; /* NOP for QState. */ +} + +static int +vmci_transport_notify_pkt_send_pre_enqueue( + struct sock *sk, + struct vmci_transport_send_notify_data *data) +{ + return 0; /* NOP for QState. */ +} + +/* Socket always on control packet based operations. */ +struct vmci_transport_notify_ops vmci_transport_notify_pkt_q_state_ops = { + vmci_transport_notify_pkt_socket_init, + vmci_transport_notify_pkt_socket_destruct, + vmci_transport_notify_pkt_poll_in, + vmci_transport_notify_pkt_poll_out, + vmci_transport_notify_pkt_handle_pkt, + vmci_transport_notify_pkt_recv_init, + vmci_transport_notify_pkt_recv_pre_block, + vmci_transport_notify_pkt_recv_pre_dequeue, + vmci_transport_notify_pkt_recv_post_dequeue, + vmci_transport_notify_pkt_send_init, + vmci_transport_notify_pkt_send_pre_block, + vmci_transport_notify_pkt_send_pre_enqueue, + vmci_transport_notify_pkt_send_post_enqueue, + vmci_transport_notify_pkt_process_request, + vmci_transport_notify_pkt_process_negotiate, +}; diff --git a/net/vmw_vsock/vsock_addr.c b/net/vmw_vsock/vsock_addr.c new file mode 100644 index 0000000..b7df1ae --- /dev/null +++ b/net/vmw_vsock/vsock_addr.c @@ -0,0 +1,86 @@ +/* + * VMware vSockets Driver + * + * Copyright (C) 2007-2012 VMware, Inc. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation version 2 and no later version. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + */ + +#include <linux/types.h> +#include <linux/socket.h> +#include <linux/stddef.h> +#include <net/sock.h> + +#include "vsock_addr.h" + +void vsock_addr_init(struct sockaddr_vm *addr, u32 cid, u32 port) +{ + memset(addr, 0, sizeof(*addr)); + addr->svm_family = AF_VSOCK; + addr->svm_cid = cid; + addr->svm_port = port; +} +EXPORT_SYMBOL_GPL(vsock_addr_init); + +int vsock_addr_validate(const struct sockaddr_vm *addr) +{ + if (!addr) + return -EFAULT; + + if (addr->svm_family != AF_VSOCK) + return -EAFNOSUPPORT; + + if (addr->svm_zero[0] != 0) + return -EINVAL; + + return 0; +} +EXPORT_SYMBOL_GPL(vsock_addr_validate); + +bool vsock_addr_bound(const struct sockaddr_vm *addr) +{ + return addr->svm_port != VMADDR_PORT_ANY; +} +EXPORT_SYMBOL_GPL(vsock_addr_bound); + +void vsock_addr_unbind(struct sockaddr_vm *addr) +{ + vsock_addr_init(addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); +} +EXPORT_SYMBOL_GPL(vsock_addr_unbind); + +bool vsock_addr_equals_addr(const struct sockaddr_vm *addr, + const struct sockaddr_vm *other) +{ + return addr->svm_cid == other->svm_cid && + addr->svm_port == other->svm_port; +} +EXPORT_SYMBOL_GPL(vsock_addr_equals_addr); + +bool vsock_addr_equals_addr_any(const struct sockaddr_vm *addr, + const struct sockaddr_vm *other) +{ + return (addr->svm_cid == VMADDR_CID_ANY || + other->svm_cid == VMADDR_CID_ANY || + addr->svm_cid == other->svm_cid) && + addr->svm_port == other->svm_port; +} +EXPORT_SYMBOL_GPL(vsock_addr_equals_addr_any); + +int vsock_addr_cast(const struct sockaddr *addr, + size_t len, struct sockaddr_vm **out_addr) +{ + if (len < sizeof(**out_addr)) + return -EFAULT; + + *out_addr = (struct sockaddr_vm *)addr; + return vsock_addr_validate(*out_addr); +} +EXPORT_SYMBOL_GPL(vsock_addr_cast); diff --git a/net/vmw_vsock/vsock_addr.h b/net/vmw_vsock/vsock_addr.h new file mode 100644 index 0000000..cdfbcef --- /dev/null +++ b/net/vmw_vsock/vsock_addr.h @@ -0,0 +1,32 @@ +/* + * VMware vSockets Driver + * + * Copyright (C) 2007-2013 VMware, Inc. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation version 2 and no later version. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + */ + +#ifndef _VSOCK_ADDR_H_ +#define _VSOCK_ADDR_H_ + +#include <linux/vm_sockets.h> + +void vsock_addr_init(struct sockaddr_vm *addr, u32 cid, u32 port); +int vsock_addr_validate(const struct sockaddr_vm *addr); +bool vsock_addr_bound(const struct sockaddr_vm *addr); +void vsock_addr_unbind(struct sockaddr_vm *addr); +bool vsock_addr_equals_addr(const struct sockaddr_vm *addr, + const struct sockaddr_vm *other); +bool vsock_addr_equals_addr_any(const struct sockaddr_vm *addr, + const struct sockaddr_vm *other); +int vsock_addr_cast(const struct sockaddr *addr, size_t len, + struct sockaddr_vm **out_addr); + +#endif diff --git a/net/vmw_vsock/vsock_version.h b/net/vmw_vsock/vsock_version.h new file mode 100644 index 0000000..4df7f5e --- /dev/null +++ b/net/vmw_vsock/vsock_version.h @@ -0,0 +1,22 @@ +/* + * VMware vSockets Driver + * + * Copyright (C) 2011-2012 VMware, Inc. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation version 2 and no later version. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + */ + +#ifndef _VSOCK_VERSION_H_ +#define _VSOCK_VERSION_H_ + +#define VSOCK_DRIVER_VERSION_PARTS { 1, 0, 0, 0 } +#define VSOCK_DRIVER_VERSION_STRING "1.0.0.0-k" + +#endif /* _VSOCK_VERSION_H_ */ |
