[RFC PATCH v5 14/19] virtio/vsock: rest of SOCK_SEQPACKET support

Arseny Krasnov
2021-02-18T05:50:07Z

This adds rest of logic for SEQPACKET:
1) SEQPACKET specific functions which send SEQ_BEGIN/SEQ_END.
Note that both functions may sleep to wait enough space for
SEQPACKET header.
2) SEQ_BEGIN/SEQ_END in TAP packet capture.
3) Send SHUTDOWN on socket close for SEQPACKET type.
4) Set SEQPACKET packet type during send.
5) Set MSG_EOR in flags for SEQPACKET during send.

Signed-off-by: Arseny Krasnov <arseny.krasnov@kaspersky.com>
---
include/linux/virtio_vsock.h | 3 ++
net/vmw_vsock/virtio_transport_common.c | 67 ++++++++++++++++++++++++-
2 files changed, 68 insertions(+), 2 deletions(-)

diff --git a/include/linux/virtio_vsock.h b/include/linux/virtio_vsock.h
index 022667d57884..bf09d9aafa20 100644
--- a/include/linux/virtio_vsock.h
+++ b/include/linux/virtio_vsock.h
@@ -41,6 +41,7 @@ struct virtio_vsock_sock {
u32 user_read_seq_len;
u32 user_read_copied;
u32 curr_rx_msg_cnt;
+ u32 next_tx_msg_cnt;
};

struct virtio_vsock_pkt {
@@ -85,6 +86,8 @@ virtio_transport_dgram_dequeue(struct vsock_sock *vsk,
struct msghdr *msg,
size_t len, int flags);

+int virtio_transport_seqpacket_seq_send_len(struct vsock_sock *vsk, size_t len, int flags);
+int virtio_transport_seqpacket_seq_send_eor(struct vsock_sock *vsk, int flags);
size_t virtio_transport_seqpacket_seq_get_len(struct vsock_sock *vsk);
int
virtio_transport_seqpacket_dequeue(struct vsock_sock *vsk,
diff --git a/net/vmw_vsock/virtio_transport_common.c b/net/vmw_vsock/virtio_transport_common.c
index 3ca0009c553e..8431d0a891ed 100644
--- a/net/vmw_vsock/virtio_transport_common.c
+++ b/net/vmw_vsock/virtio_transport_common.c
@@ -139,6 +139,8 @@ static struct sk_buff *virtio_transport_build_skb(void *opaque)
break;
case VIRTIO_VSOCK_OP_CREDIT_UPDATE:
case VIRTIO_VSOCK_OP_CREDIT_REQUEST:
+ case VIRTIO_VSOCK_OP_SEQ_BEGIN:
+ case VIRTIO_VSOCK_OP_SEQ_END:
hdr->op = cpu_to_le16(AF_VSOCK_OP_CONTROL);
break;
default:
@@ -187,7 +189,12 @@ static int virtio_transport_send_pkt_info(struct vsock_sock *vsk,
struct virtio_vsock_pkt *pkt;
u32 pkt_len = info->pkt_len;

- info->type = VIRTIO_VSOCK_TYPE_STREAM;
+ info->type = virtio_transport_get_type(sk_vsock(vsk));
+
+ if (info->type == VIRTIO_VSOCK_TYPE_SEQPACKET &&
+ info->msg &&
+ info->msg->msg_flags & MSG_EOR)
+ info->flags |= VIRTIO_VSOCK_RW_EOR;

t_ops = virtio_transport_get_ops(vsk);
if (unlikely(!t_ops))
@@ -401,6 +408,62 @@ virtio_transport_stream_do_dequeue(struct vsock_sock *vsk,
return err;
}

+static int virtio_transport_seqpacket_send_ctrl(struct vsock_sock *vsk,
+ int type,
+ size_t len,
+ int flags)
+{
+ struct virtio_vsock_sock *vvs = vsk->trans;
+ struct virtio_vsock_pkt_info info = {
+ .op = type,
+ .vsk = vsk,
+ .pkt_len = sizeof(struct virtio_vsock_seq_hdr)
+ };
+
+ struct virtio_vsock_seq_hdr seq_hdr = {
+ .msg_cnt = cpu_to_le32(vvs->next_tx_msg_cnt),
+ .msg_len = cpu_to_le32(len)
+ };
+
+ struct kvec seq_hdr_kiov = {
+ .iov_base = (void *)&seq_hdr,
+ .iov_len = sizeof(struct virtio_vsock_seq_hdr)
+ };
+
+ struct msghdr msg = {0};
+
+ //XXX: do we need 'vsock_transport_send_notify_data' pointer?
+ if (vsock_wait_space(sk_vsock(vsk),
+ sizeof(struct virtio_vsock_seq_hdr),
+ flags, NULL))
+ return -1;
+
+ iov_iter_kvec(&msg.msg_iter, WRITE, &seq_hdr_kiov, 1, sizeof(seq_hdr));
+
+ info.msg = &msg;
+ vvs->next_tx_msg_cnt++;
+
+ return virtio_transport_send_pkt_info(vsk, &info);
+}
+
+int virtio_transport_seqpacket_seq_send_len(struct vsock_sock *vsk, size_t len, int flags)
+{
+ return virtio_transport_seqpacket_send_ctrl(vsk,
+ VIRTIO_VSOCK_OP_SEQ_BEGIN,
+ len,
+ flags);
+}
+EXPORT_SYMBOL_GPL(virtio_transport_seqpacket_seq_send_len);
+
+int virtio_transport_seqpacket_seq_send_eor(struct vsock_sock *vsk, int flags)
+{
+ return virtio_transport_seqpacket_send_ctrl(vsk,
+ VIRTIO_VSOCK_OP_SEQ_END,
+ 0,
+ flags);
+}
+EXPORT_SYMBOL_GPL(virtio_transport_seqpacket_seq_send_eor);
+
static inline void virtio_transport_remove_pkt(struct virtio_vsock_pkt *pkt)
{
list_del(&pkt->list);
@@ -999,7 +1062,7 @@ void virtio_transport_release(struct vsock_sock *vsk)
struct sock *sk = &vsk->sk;
bool remove_sock = true;

- if (sk->sk_type == SOCK_STREAM)
+ if (sk->sk_type == SOCK_STREAM || sk->sk_type == SOCK_SEQPACKET)
remove_sock = virtio_transport_close(vsk);

list_for_each_entry_safe(pkt, tmp, &vvs->rx_queue, list) {
--
2.25.1