[RFC PATCH v3 05/13] af_vsock: rest of SEQPACKET support

Arseny Krasnov
2021-01-25T11:52:10Z

This does rest of SOCK_SEQPACKET support:
1) Adds socket ops for SEQPACKET type.
2) Allows to create socket with SEQPACKET type.

Signed-off-by: Arseny Krasnov <arseny.krasnov@kaspersky.com>
---
net/vmw_vsock/af_vsock.c | 71 ++++++++++++++++++++++++++++++++++++++++
1 file changed, 71 insertions(+)

diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c
index 4600c1ec3bb3..bbc3c31085aa 100644
--- a/net/vmw_vsock/af_vsock.c
+++ b/net/vmw_vsock/af_vsock.c
@@ -452,6 +452,7 @@ int vsock_assign_transport(struct vsock_sock *vsk, struct vsock_sock *psk)
new_transport = transport_dgram;
break;
case SOCK_STREAM:
+ case SOCK_SEQPACKET:
if (vsock_use_local_transport(remote_cid))
new_transport = transport_local;
else if (remote_cid <= VMADDR_CID_HOST || !transport_h2g ||
@@ -459,6 +460,13 @@ int vsock_assign_transport(struct vsock_sock *vsk, struct vsock_sock *psk)
new_transport = transport_g2h;
else
new_transport = transport_h2g;
+
+ if (sk->sk_type == SOCK_SEQPACKET) {
+ if (!new_transport->seqpacket_seq_send_len ||
+ !new_transport->seqpacket_seq_get_len ||
+ !new_transport->seqpacket_dequeue)
+ return -ENODEV;
+ }
break;
default:
return -ESOCKTNOSUPPORT;
@@ -684,6 +692,7 @@ static int __vsock_bind(struct sock *sk, struct sockaddr_vm *addr)

switch (sk->sk_socket->type) {
case SOCK_STREAM:
+ case SOCK_SEQPACKET:
spin_lock_bh(&vsock_table_lock);
retval = __vsock_bind_connectible(vsk, addr);
spin_unlock_bh(&vsock_table_lock);
@@ -1406,6 +1415,12 @@ static int vsock_stream_connect(struct socket *sock, struct sockaddr *addr,
return vsock_connect(sock, addr, addr_len, flags);
}

+static int vsock_seqpacket_connect(struct socket *sock, struct sockaddr *addr,
+ int addr_len, int flags)
+{
+ return vsock_connect(sock, addr, addr_len, flags);
+}
+
static int vsock_accept(struct socket *sock, struct socket *newsock, int flags,
bool kern)
{
@@ -1633,6 +1648,16 @@ static int vsock_stream_setsockopt(struct socket *sock,
optlen);
}

+static int vsock_seqpacket_setsockopt(struct socket *sock,
+ int level,
+ int optname,
+ sockptr_t optval,
+ unsigned int optlen)
+{
+ return vsock_connectible_setsockopt(sock, level, optname, optval,
+ optlen);
+}
+
static int vsock_connectible_getsockopt(struct socket *sock,
int level, int optname,
char __user *optval,
@@ -1713,6 +1738,15 @@ static int vsock_stream_getsockopt(struct socket *sock,
optlen);
}

+static int vsock_seqpacket_getsockopt(struct socket *sock,
+ int level, int optname,
+ char __user *optval,
+ int __user *optlen)
+{
+ return vsock_connectible_getsockopt(sock, level, optname, optval,
+ optlen);
+}
+
static int vsock_connectible_sendmsg(struct socket *sock, struct msghdr *msg,
size_t len)
{
@@ -1870,6 +1904,12 @@ static int vsock_stream_sendmsg(struct socket *sock, struct msghdr *msg,
return vsock_connectible_sendmsg(sock, msg, len);
}

+static int vsock_seqpacket_sendmsg(struct socket *sock, struct msghdr *msg,
+ size_t len)
+{
+ return vsock_connectible_sendmsg(sock, msg, len);
+}
+
static int vsock_wait_data(struct sock *sk, struct wait_queue_entry *wait,
long timeout,
struct vsock_transport_recv_notify_data *recv_data,
@@ -2184,6 +2224,13 @@ vsock_stream_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
return vsock_connectible_recvmsg(sock, msg, len, flags);
}

+static int
+vsock_seqpacket_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
+ int flags)
+{
+ return vsock_connectible_recvmsg(sock, msg, len, flags);
+}
+
static const struct proto_ops vsock_stream_ops = {
.family = PF_VSOCK,
.owner = THIS_MODULE,
@@ -2205,6 +2252,27 @@ static const struct proto_ops vsock_stream_ops = {
.sendpage = sock_no_sendpage,
};

+static const struct proto_ops vsock_seqpacket_ops = {
+ .family = PF_VSOCK,
+ .owner = THIS_MODULE,
+ .release = vsock_release,
+ .bind = vsock_bind,
+ .connect = vsock_seqpacket_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_seqpacket_setsockopt,
+ .getsockopt = vsock_seqpacket_getsockopt,
+ .sendmsg = vsock_seqpacket_sendmsg,
+ .recvmsg = vsock_seqpacket_recvmsg,
+ .mmap = sock_no_mmap,
+ .sendpage = sock_no_sendpage,
+};
+
static int vsock_create(struct net *net, struct socket *sock,
int protocol, int kern)
{
@@ -2225,6 +2293,9 @@ static int vsock_create(struct net *net, struct socket *sock,
case SOCK_STREAM:
sock->ops = &vsock_stream_ops;
break;
+ case SOCK_SEQPACKET:
+ sock->ops = &vsock_seqpacket_ops;
+ break;
default:
return -ESOCKTNOSUPPORT;
}
--
2.25.1