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authorAsias He <asias@redhat.com>2015-12-02 14:43:59 +0800
committerDavid S. Miller <davem@davemloft.net>2015-12-03 15:05:54 -0500
commit357ab2234d57f6c74386f64ded42dff8e3c0500b (patch)
tree5ba7c64aa7db94d55124677e15bfb5d1d48ee92c /net
parentc89359a42e2a49656451569c382eed63e781153c (diff)
VSOCK: Introduce vsock_find_unbound_socket and vsock_bind_dgram_generic
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>
Diffstat (limited to 'net')
-rw-r--r--net/vmw_vsock/af_vsock.c70
1 files changed, 70 insertions, 0 deletions
diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c
index 7fd1220fbfa0..77247a2b670b 100644
--- a/net/vmw_vsock/af_vsock.c
+++ b/net/vmw_vsock/af_vsock.c
@@ -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)
{