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VSOCK: Introduce vsock_find_unbound_socket and vsock_bind_dgram_generic

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Signed-off-by: Asias He <asias@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Asias He 2015-12-02 14:43:59 +08:00 committed by David S. Miller
parent c89359a42e
commit 357ab2234d
2 changed files with 72 additions and 0 deletions
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2
include/net/af_vsock.h
View File

@ -175,8 +175,10 @@ 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_unbound_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));
int vsock_bind_dgram_generic(struct vsock_sock *vsk, struct sockaddr_vm *addr);
#endif /* __AF_VSOCK_H__ */

70
net/vmw_vsock/af_vsock.c
View File

@ -223,6 +223,17 @@ static struct sock *__vsock_find_bound_socket(struct sockaddr_vm *addr)
return NULL;
}
static struct sock *__vsock_find_unbound_socket(struct sockaddr_vm *addr)
{
struct vsock_sock *vsk;
list_for_each_entry(vsk, vsock_unbound_sockets, bound_table)
if (addr->svm_port == vsk->local_addr.svm_port)
return sk_vsock(vsk);
return NULL;
}
static struct sock *__vsock_find_connected_socket(struct sockaddr_vm *src,
struct sockaddr_vm *dst)
{
@ -298,6 +309,21 @@ struct sock *vsock_find_bound_socket(struct sockaddr_vm *addr)
}
EXPORT_SYMBOL_GPL(vsock_find_bound_socket);
struct sock *vsock_find_unbound_socket(struct sockaddr_vm *addr)
{
struct sock *sk;
spin_lock_bh(&vsock_table_lock);
sk = __vsock_find_unbound_socket(addr);
if (sk)
sock_hold(sk);
spin_unlock_bh(&vsock_table_lock);
return sk;
}
EXPORT_SYMBOL_GPL(vsock_find_unbound_socket);
struct sock *vsock_find_connected_socket(struct sockaddr_vm *src,
struct sockaddr_vm *dst)
{
@ -532,6 +558,50 @@ static int __vsock_bind_stream(struct vsock_sock *vsk,
return 0;
}
int vsock_bind_dgram_generic(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_unbound_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_unbound_socket(&new_addr))
return -EADDRINUSE;
}
vsock_addr_init(&vsk->local_addr, new_addr.svm_cid, new_addr.svm_port);
return 0;
}
EXPORT_SYMBOL_GPL(vsock_bind_dgram_generic);
static int __vsock_bind_dgram(struct vsock_sock *vsk,
struct sockaddr_vm *addr)
{