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SubjectRe: [PATCH 1/5] vsock/virtio: support for SOCK_SEQPACKET socket.
From
Date
03.01.2021 22:57, Arseny Krasnov пишет:
> This extends rx loop for SOCK_SEQPACKET packets and implements
> callback which user calls to copy data to its buffer.
>
> Signed-off-by: Arseny Krasnov <arseny.krasnov@kaspersky.com>
> ---
> include/linux/virtio_vsock.h | 7 +
> include/net/af_vsock.h | 4 +
> include/uapi/linux/virtio_vsock.h | 9 +
> net/vmw_vsock/virtio_transport.c | 3 +
> net/vmw_vsock/virtio_transport_common.c | 323 +++++++++++++++++++++---
> 5 files changed, 305 insertions(+), 41 deletions(-)
>
> diff --git a/include/linux/virtio_vsock.h b/include/linux/virtio_vsock.h
> index dc636b727179..4902d71b3252 100644
> --- a/include/linux/virtio_vsock.h
> +++ b/include/linux/virtio_vsock.h
> @@ -36,6 +36,10 @@ struct virtio_vsock_sock {
> u32 rx_bytes;
> u32 buf_alloc;
> struct list_head rx_queue;
> +
> + /* For SOCK_SEQPACKET */
> + u32 user_read_seq_len;
> + u32 user_read_copied;
> };
>
> struct virtio_vsock_pkt {
> @@ -80,6 +84,9 @@ virtio_transport_dgram_dequeue(struct vsock_sock *vsk,
> struct msghdr *msg,
> size_t len, int flags);
>
> +bool virtio_transport_seqpacket_seq_send_len(struct vsock_sock *vsk, size_t len);
> +size_t virtio_transport_seqpacket_seq_get_len(struct vsock_sock *vsk);
> +
> s64 virtio_transport_stream_has_data(struct vsock_sock *vsk);
> s64 virtio_transport_stream_has_space(struct vsock_sock *vsk);
>
> diff --git a/include/net/af_vsock.h b/include/net/af_vsock.h
> index b1c717286993..792ea7b66574 100644
> --- a/include/net/af_vsock.h
> +++ b/include/net/af_vsock.h
> @@ -135,6 +135,10 @@ struct vsock_transport {
> bool (*stream_is_active)(struct vsock_sock *);
> bool (*stream_allow)(u32 cid, u32 port);
>
> + /* SEQ_PACKET. */
> + bool (*seqpacket_seq_send_len)(struct vsock_sock *, size_t len);
> + size_t (*seqpacket_seq_get_len)(struct vsock_sock *);
> +
> /* Notification. */
> int (*notify_poll_in)(struct vsock_sock *, size_t, bool *);
> int (*notify_poll_out)(struct vsock_sock *, size_t, bool *);
> diff --git a/include/uapi/linux/virtio_vsock.h b/include/uapi/linux/virtio_vsock.h
> index 1d57ed3d84d2..058908bc19fc 100644
> --- a/include/uapi/linux/virtio_vsock.h
> +++ b/include/uapi/linux/virtio_vsock.h
> @@ -65,6 +65,7 @@ struct virtio_vsock_hdr {
>
> enum virtio_vsock_type {
> VIRTIO_VSOCK_TYPE_STREAM = 1,
> + VIRTIO_VSOCK_TYPE_SEQPACKET = 2,
> };
>
> enum virtio_vsock_op {
> @@ -83,6 +84,9 @@ enum virtio_vsock_op {
> VIRTIO_VSOCK_OP_CREDIT_UPDATE = 6,
> /* Request the peer to send the credit info to us */
> VIRTIO_VSOCK_OP_CREDIT_REQUEST = 7,
> +
> + /* Record begin for SOCK_SEQPACKET */
> + VIRTIO_VSOCK_OP_SEQ_BEGIN = 8,
> };
>
> /* VIRTIO_VSOCK_OP_SHUTDOWN flags values */
> @@ -91,4 +95,9 @@ enum virtio_vsock_shutdown {
> VIRTIO_VSOCK_SHUTDOWN_SEND = 2,
> };
>
> +/* VIRTIO_VSOCK_OP_RW flags values for SOCK_SEQPACKET type */
> +enum virtio_vsock_rw_seqpacket {
> + VIRTIO_VSOCK_RW_EOR = 1,
> +};
> +
> #endif /* _UAPI_LINUX_VIRTIO_VSOCK_H */
> diff --git a/net/vmw_vsock/virtio_transport.c b/net/vmw_vsock/virtio_transport.c
> index 2700a63ab095..2bd3f7cbffcb 100644
> --- a/net/vmw_vsock/virtio_transport.c
> +++ b/net/vmw_vsock/virtio_transport.c
> @@ -469,6 +469,9 @@ static struct virtio_transport virtio_transport = {
> .stream_is_active = virtio_transport_stream_is_active,
> .stream_allow = virtio_transport_stream_allow,
>
> + .seqpacket_seq_send_len = virtio_transport_seqpacket_seq_send_len,
> + .seqpacket_seq_get_len = virtio_transport_seqpacket_seq_get_len,
> +
> .notify_poll_in = virtio_transport_notify_poll_in,
> .notify_poll_out = virtio_transport_notify_poll_out,
> .notify_recv_init = virtio_transport_notify_recv_init,
> diff --git a/net/vmw_vsock/virtio_transport_common.c b/net/vmw_vsock/virtio_transport_common.c
> index 5956939eebb7..77c42004e422 100644
> --- a/net/vmw_vsock/virtio_transport_common.c
> +++ b/net/vmw_vsock/virtio_transport_common.c
> @@ -139,6 +139,7 @@ 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:
> hdr->op = cpu_to_le16(AF_VSOCK_OP_CONTROL);
> break;
> default:
> @@ -157,6 +158,10 @@ static struct sk_buff *virtio_transport_build_skb(void *opaque)
>
> void virtio_transport_deliver_tap_pkt(struct virtio_vsock_pkt *pkt)
> {
> + /* TODO: implement tap support for SOCK_SEQPACKET. */
> + if (le32_to_cpu(pkt->hdr.type) == VIRTIO_VSOCK_TYPE_SEQPACKET)
> + return;
> +
> if (pkt->tap_delivered)
> return;
>
> @@ -230,10 +235,10 @@ static bool virtio_transport_inc_rx_pkt(struct virtio_vsock_sock *vvs,
> }
>
> static void virtio_transport_dec_rx_pkt(struct virtio_vsock_sock *vvs,
> - struct virtio_vsock_pkt *pkt)
> + u32 len)
> {
> - vvs->rx_bytes -= pkt->len;
> - vvs->fwd_cnt += pkt->len;
> + vvs->rx_bytes -= len;
> + vvs->fwd_cnt += len;
> }
>
> void virtio_transport_inc_tx_pkt(struct virtio_vsock_sock *vvs, struct virtio_vsock_pkt *pkt)
> @@ -365,7 +370,7 @@ virtio_transport_stream_do_dequeue(struct vsock_sock *vsk,
> total += bytes;
> pkt->off += bytes;
> if (pkt->off == pkt->len) {
> - virtio_transport_dec_rx_pkt(vvs, pkt);
> + virtio_transport_dec_rx_pkt(vvs, pkt->len);
> list_del(&pkt->list);
> virtio_transport_free_pkt(pkt);
> }
> @@ -397,15 +402,202 @@ virtio_transport_stream_do_dequeue(struct vsock_sock *vsk,
> return err;
> }
>
> +static u16 virtio_transport_get_type(struct sock *sk)
> +{
> + if (sk->sk_type == SOCK_STREAM)
> + return VIRTIO_VSOCK_TYPE_STREAM;
> + else
> + return VIRTIO_VSOCK_TYPE_SEQPACKET;
> +}
> +
> +bool virtio_transport_seqpacket_seq_send_len(struct vsock_sock *vsk, size_t len)
> +{
> + struct virtio_vsock_pkt_info info = {
> + .type = VIRTIO_VSOCK_TYPE_SEQPACKET,
> + .op = VIRTIO_VSOCK_OP_SEQ_BEGIN,
> + .vsk = vsk,
> + .flags = len
> + };
> +
> + return virtio_transport_send_pkt_info(vsk, &info);
> +}
> +EXPORT_SYMBOL_GPL(virtio_transport_seqpacket_seq_send_len);
> +
> +static inline void virtio_transport_del_n_free_pkt(struct virtio_vsock_pkt *pkt)
> +{
> + list_del(&pkt->list);
> + virtio_transport_free_pkt(pkt);
> +}
> +
> +static size_t virtio_transport_drop_until_seq_begin(struct virtio_vsock_sock *vvs)
> +{
> + struct virtio_vsock_pkt *pkt, *n;
> + size_t bytes_dropped = 0;
> +
> + list_for_each_entry_safe(pkt, n, &vvs->rx_queue, list) {
> + if (le16_to_cpu(pkt->hdr.op) == VIRTIO_VSOCK_OP_SEQ_BEGIN)
> + break;
> +
> + bytes_dropped += le32_to_cpu(pkt->hdr.len);
> + virtio_transport_dec_rx_pkt(vvs, pkt->len);
> + virtio_transport_del_n_free_pkt(pkt);
> + }
> +
> + return bytes_dropped;
> +}
> +
> +size_t virtio_transport_seqpacket_seq_get_len(struct vsock_sock *vsk)
> +{
> + struct virtio_vsock_sock *vvs = vsk->trans;
> + struct virtio_vsock_pkt *pkt;
> + size_t bytes_dropped;
> +
> + spin_lock_bh(&vvs->rx_lock);
> +
> + /* Fetch all orphaned 'RW', packets, and
> + * send credit update.
> + */
> + bytes_dropped = virtio_transport_drop_until_seq_begin(vvs);
> +
> + if (list_empty(&vvs->rx_queue))
> + goto out;
> +
> + pkt = list_first_entry(&vvs->rx_queue, struct virtio_vsock_pkt, list);
> +
> + vvs->user_read_copied = 0;
> + vvs->user_read_seq_len = le32_to_cpu(pkt->hdr.flags);
> + virtio_transport_del_n_free_pkt(pkt);
> +out:
> + spin_unlock_bh(&vvs->rx_lock);
> +
> + if (bytes_dropped)
> + virtio_transport_send_credit_update(vsk,
> + VIRTIO_VSOCK_TYPE_SEQPACKET,
> + NULL);
> +
> + return vvs->user_read_seq_len;
> +}
> +EXPORT_SYMBOL_GPL(virtio_transport_seqpacket_seq_get_len);
> +
> +static ssize_t virtio_transport_seqpacket_do_dequeue(struct vsock_sock *vsk,
> + struct msghdr *msg,
> + size_t user_buf_len)
> +{
> + struct virtio_vsock_sock *vvs = vsk->trans;
> + struct virtio_vsock_pkt *pkt;
> + size_t bytes_handled = 0;
> + int err = 0;
> +
> + spin_lock_bh(&vvs->rx_lock);
> +
> + if (user_buf_len == 0) {
IMHO you can avoid this special-casing
by introducing yet another outer loop just
for draining the extra data from buffer.
Admittedly that may also require an extra
transport op.

> + /* User's buffer is full, we processing rest of
> + * record and drop it. If 'SEQ_BEGIN' is found
> + * while iterating, user will be woken up,
> + * because record is already copied, and we
> + * don't care about absent of some tail RW packets
> + * of it. Return number of bytes(rest of record),
> + * but ignore credit update for such absent bytes.
> + */
> + bytes_handled = virtio_transport_drop_until_seq_begin(vvs);
> + vvs->user_read_copied += bytes_handled;
> +
> + if (!list_empty(&vvs->rx_queue) &&
> + vvs->user_read_copied < vvs->user_read_seq_len) {
> + /* 'SEQ_BEGIN' found, but record isn't complete.
> + * Set number of copied bytes to fit record size
> + * and force counters to finish receiving.
> + */
> + bytes_handled += (vvs->user_read_seq_len - vvs->user_read_copied);
> + vvs->user_read_copied = vvs->user_read_seq_len;
> + }
> + }
> +
> + /* Now start copying. */
> + while (vvs->user_read_copied < vvs->user_read_seq_len &&
> + vvs->rx_bytes &&
> + user_buf_len &&
> + !err) {
> + pkt = list_first_entry(&vvs->rx_queue, struct virtio_vsock_pkt, list);
> +
> + switch (le16_to_cpu(pkt->hdr.op)) {
> + case VIRTIO_VSOCK_OP_SEQ_BEGIN: {
> + /* Unexpected 'SEQ_BEGIN' during record copy:
> + * Leave receive loop, 'EAGAIN' will restart it from
> + * outer receive loop, packet is still in queue and
> + * counters are cleared. So in next loop enter,
> + * 'SEQ_BEGIN' will be dequeued first. User's iov
> + * iterator will be reset in outer loop. Also
> + * send credit update, because some bytes could be
> + * copied. User will never see unfinished record.
> + */
> + err = -EAGAIN;
> + break;
> + }
> + case VIRTIO_VSOCK_OP_RW: {
> + size_t bytes_to_copy;
> + size_t pkt_len;
> +
> + pkt_len = (size_t)le32_to_cpu(pkt->hdr.len);
> + bytes_to_copy = min(user_buf_len, pkt_len);
> +
> + /* sk_lock is held by caller so no one else can dequeue.
> + * Unlock rx_lock since memcpy_to_msg() may sleep.
> + */
> + spin_unlock_bh(&vvs->rx_lock);
> +
> + if (memcpy_to_msg(msg, pkt->buf, bytes_to_copy)) {
> + spin_lock_bh(&vvs->rx_lock);
> + err = -EINVAL;
> + break;
> + }
> +
> + spin_lock_bh(&vvs->rx_lock);
> + user_buf_len -= bytes_to_copy;
> + bytes_handled += pkt->len;
> + vvs->user_read_copied += bytes_to_copy;
> +
> + if (le16_to_cpu(pkt->hdr.flags) & VIRTIO_VSOCK_RW_EOR)
> + msg->msg_flags |= MSG_EOR;
> + break;
> + }
> + default:
> + ;
> + }
> +
> + /* For unexpected 'SEQ_BEGIN', keep such packet in queue,
> + * but drop any other type of packet.
> + */
> + if (le16_to_cpu(pkt->hdr.op) != VIRTIO_VSOCK_OP_SEQ_BEGIN) {
> + virtio_transport_dec_rx_pkt(vvs, pkt->len);
> + virtio_transport_del_n_free_pkt(pkt);
> + }
> + }
> +
> + spin_unlock_bh(&vvs->rx_lock);
> +
> + virtio_transport_send_credit_update(vsk, VIRTIO_VSOCK_TYPE_SEQPACKET,
> + NULL);
> +
> + return err ?: bytes_handled;
> +}
> +
> ssize_t
> virtio_transport_stream_dequeue(struct vsock_sock *vsk,
> struct msghdr *msg,
> size_t len, int flags)
> {
> - if (flags & MSG_PEEK)
> - return virtio_transport_stream_do_peek(vsk, msg, len);
> - else
> + if (virtio_transport_get_type(sk_vsock(vsk)) == VIRTIO_VSOCK_TYPE_SEQPACKET) {
> + if (flags & MSG_PEEK)
> + return -EOPNOTSUPP;
> +
> + return virtio_transport_seqpacket_do_dequeue(vsk, msg, len);
> + } else {
> + if (flags & MSG_PEEK)
> + return virtio_transport_stream_do_peek(vsk, msg, len);
> +
> return virtio_transport_stream_do_dequeue(vsk, msg, len);
> + }
> }
> EXPORT_SYMBOL_GPL(virtio_transport_stream_dequeue);
>
> @@ -481,6 +673,8 @@ int virtio_transport_do_socket_init(struct vsock_sock *vsk,
> spin_lock_init(&vvs->rx_lock);
> spin_lock_init(&vvs->tx_lock);
> INIT_LIST_HEAD(&vvs->rx_queue);
> + vvs->user_read_copied = 0;
> + vvs->user_read_seq_len = 0;
>
> return 0;
> }
> @@ -490,13 +684,16 @@ EXPORT_SYMBOL_GPL(virtio_transport_do_socket_init);
> void virtio_transport_notify_buffer_size(struct vsock_sock *vsk, u64 *val)
> {
> struct virtio_vsock_sock *vvs = vsk->trans;
> + int type;
>
> if (*val > VIRTIO_VSOCK_MAX_BUF_SIZE)
> *val = VIRTIO_VSOCK_MAX_BUF_SIZE;
>
> vvs->buf_alloc = *val;
>
> - virtio_transport_send_credit_update(vsk, VIRTIO_VSOCK_TYPE_STREAM,
> + type = virtio_transport_get_type(sk_vsock(vsk));
> +
> + virtio_transport_send_credit_update(vsk, type,
> NULL);
> }
> EXPORT_SYMBOL_GPL(virtio_transport_notify_buffer_size);
> @@ -624,10 +821,11 @@ int virtio_transport_connect(struct vsock_sock *vsk)
> {
> struct virtio_vsock_pkt_info info = {
> .op = VIRTIO_VSOCK_OP_REQUEST,
> - .type = VIRTIO_VSOCK_TYPE_STREAM,
> .vsk = vsk,
> };
>
> + info.type = virtio_transport_get_type(sk_vsock(vsk));
> +
> return virtio_transport_send_pkt_info(vsk, &info);
> }
> EXPORT_SYMBOL_GPL(virtio_transport_connect);
> @@ -636,7 +834,6 @@ int virtio_transport_shutdown(struct vsock_sock *vsk, int mode)
> {
> struct virtio_vsock_pkt_info info = {
> .op = VIRTIO_VSOCK_OP_SHUTDOWN,
> - .type = VIRTIO_VSOCK_TYPE_STREAM,
> .flags = (mode & RCV_SHUTDOWN ?
> VIRTIO_VSOCK_SHUTDOWN_RCV : 0) |
> (mode & SEND_SHUTDOWN ?
> @@ -644,6 +841,8 @@ int virtio_transport_shutdown(struct vsock_sock *vsk, int mode)
> .vsk = vsk,
> };
>
> + info.type = virtio_transport_get_type(sk_vsock(vsk));
> +
> return virtio_transport_send_pkt_info(vsk, &info);
> }
> EXPORT_SYMBOL_GPL(virtio_transport_shutdown);
> @@ -665,12 +864,18 @@ virtio_transport_stream_enqueue(struct vsock_sock *vsk,
> {
> struct virtio_vsock_pkt_info info = {
> .op = VIRTIO_VSOCK_OP_RW,
> - .type = VIRTIO_VSOCK_TYPE_STREAM,
> .msg = msg,
> .pkt_len = len,
> .vsk = vsk,
> + .flags = 0,
> };
>
> + info.type = virtio_transport_get_type(sk_vsock(vsk));
> +
> + if (info.type == VIRTIO_VSOCK_TYPE_SEQPACKET &&
> + msg->msg_flags & MSG_EOR)
> + info.flags |= VIRTIO_VSOCK_RW_EOR;
> +
> return virtio_transport_send_pkt_info(vsk, &info);
> }
> EXPORT_SYMBOL_GPL(virtio_transport_stream_enqueue);
> @@ -688,7 +893,6 @@ static int virtio_transport_reset(struct vsock_sock *vsk,
> {
> struct virtio_vsock_pkt_info info = {
> .op = VIRTIO_VSOCK_OP_RST,
> - .type = VIRTIO_VSOCK_TYPE_STREAM,
> .reply = !!pkt,
> .vsk = vsk,
> };
> @@ -697,6 +901,8 @@ static int virtio_transport_reset(struct vsock_sock *vsk,
> if (pkt && le16_to_cpu(pkt->hdr.op) == VIRTIO_VSOCK_OP_RST)
> return 0;
>
> + info.type = virtio_transport_get_type(sk_vsock(vsk));
> +
> return virtio_transport_send_pkt_info(vsk, &info);
> }
>
> @@ -884,44 +1090,59 @@ virtio_transport_recv_connecting(struct sock *sk,
> return err;
> }
>
> -static void
> +static bool
> virtio_transport_recv_enqueue(struct vsock_sock *vsk,
> struct virtio_vsock_pkt *pkt)
> {
> struct virtio_vsock_sock *vvs = vsk->trans;
> - bool can_enqueue, free_pkt = false;
> + bool data_ready = false;
> + bool free_pkt = false;
>
> - pkt->len = le32_to_cpu(pkt->hdr.len);
> pkt->off = 0;
> + pkt->len = le32_to_cpu(pkt->hdr.len);
>
> spin_lock_bh(&vvs->rx_lock);
>
> - can_enqueue = virtio_transport_inc_rx_pkt(vvs, pkt);
> - if (!can_enqueue) {
> - free_pkt = true;
> - goto out;
> - }
> + switch (le32_to_cpu(pkt->hdr.type)) {
> + case VIRTIO_VSOCK_TYPE_STREAM: {
> + if (!virtio_transport_inc_rx_pkt(vvs, pkt)) {
> + free_pkt = true;
> + goto out;
> + }
>
> - /* Try to copy small packets into the buffer of last packet queued,
> - * to avoid wasting memory queueing the entire buffer with a small
> - * payload.
> - */
> - if (pkt->len <= GOOD_COPY_LEN && !list_empty(&vvs->rx_queue)) {
> - struct virtio_vsock_pkt *last_pkt;
> + /* Try to copy small packets into the buffer of last packet queued,
> + * to avoid wasting memory queueing the entire buffer with a small
> + * payload.
> + */
> + if (pkt->len <= GOOD_COPY_LEN && !list_empty(&vvs->rx_queue)) {
> + struct virtio_vsock_pkt *last_pkt;
>
> - last_pkt = list_last_entry(&vvs->rx_queue,
> - struct virtio_vsock_pkt, list);
> + last_pkt = list_last_entry(&vvs->rx_queue,
> + struct virtio_vsock_pkt, list);
>
> - /* If there is space in the last packet queued, we copy the
> - * new packet in its buffer.
> - */
> - if (pkt->len <= last_pkt->buf_len - last_pkt->len) {
> - memcpy(last_pkt->buf + last_pkt->len, pkt->buf,
> - pkt->len);
> - last_pkt->len += pkt->len;
> - free_pkt = true;
> - goto out;
> + /* If there is space in the last packet queued, we copy the
> + * new packet in its buffer.
> + */
> + if (pkt->len <= last_pkt->buf_len - last_pkt->len) {
> + memcpy(last_pkt->buf + last_pkt->len, pkt->buf,
> + pkt->len);
> + last_pkt->len += pkt->len;
> + free_pkt = true;
> + goto out;
> + }
> }
> +
> + data_ready = true;
> + break;
> + }
> +
> + case VIRTIO_VSOCK_TYPE_SEQPACKET: {
> + data_ready = true;
> + vvs->rx_bytes += pkt->len;
> + break;
> + }
> + default:
> + goto out;
> }
>
> list_add_tail(&pkt->list, &vvs->rx_queue);
> @@ -930,6 +1151,8 @@ virtio_transport_recv_enqueue(struct vsock_sock *vsk,
> spin_unlock_bh(&vvs->rx_lock);
> if (free_pkt)
> virtio_transport_free_pkt(pkt);
> +
> + return data_ready;
> }
>
> static int
> @@ -940,9 +1163,17 @@ virtio_transport_recv_connected(struct sock *sk,
> int err = 0;
>
> switch (le16_to_cpu(pkt->hdr.op)) {
> + case VIRTIO_VSOCK_OP_SEQ_BEGIN: {
> + struct virtio_vsock_sock *vvs = vsk->trans;
> +
> + spin_lock_bh(&vvs->rx_lock);
> + list_add_tail(&pkt->list, &vvs->rx_queue);
> + spin_unlock_bh(&vvs->rx_lock);
> + return err;
> + }
> case VIRTIO_VSOCK_OP_RW:
> - virtio_transport_recv_enqueue(vsk, pkt);
> - sk->sk_data_ready(sk);
> + if (virtio_transport_recv_enqueue(vsk, pkt))
> + sk->sk_data_ready(sk);

Why do you need this change?
(maybe its ok, just wondering)


> return err;
> case VIRTIO_VSOCK_OP_CREDIT_UPDATE:
> sk->sk_write_space(sk);
> @@ -990,13 +1221,14 @@ virtio_transport_send_response(struct vsock_sock *vsk,
> {
> struct virtio_vsock_pkt_info info = {
> .op = VIRTIO_VSOCK_OP_RESPONSE,
> - .type = VIRTIO_VSOCK_TYPE_STREAM,
> .remote_cid = le64_to_cpu(pkt->hdr.src_cid),
> .remote_port = le32_to_cpu(pkt->hdr.src_port),
> .reply = true,
> .vsk = vsk,
> };
>
> + info.type = virtio_transport_get_type(sk_vsock(vsk));
> +
> return virtio_transport_send_pkt_info(vsk, &info);
> }
>
> @@ -1086,6 +1318,12 @@ virtio_transport_recv_listen(struct sock *sk, struct virtio_vsock_pkt *pkt,
> return 0;
> }
>
> +static bool virtio_transport_valid_type(u16 type)
> +{
> + return (type == VIRTIO_VSOCK_TYPE_STREAM) ||
> + (type == VIRTIO_VSOCK_TYPE_SEQPACKET);
> +}
> +
> /* We are under the virtio-vsock's vsock->rx_lock or vhost-vsock's vq->mutex
> * lock.
> */
> @@ -1111,7 +1349,7 @@ void virtio_transport_recv_pkt(struct virtio_transport *t,
> le32_to_cpu(pkt->hdr.buf_alloc),
> le32_to_cpu(pkt->hdr.fwd_cnt));
>
> - if (le16_to_cpu(pkt->hdr.type) != VIRTIO_VSOCK_TYPE_STREAM) {
> + if (!virtio_transport_valid_type(le16_to_cpu(pkt->hdr.type))) {
> (void)virtio_transport_reset_no_sock(t, pkt);
> goto free_pkt;
> }
> @@ -1128,6 +1366,9 @@ void virtio_transport_recv_pkt(struct virtio_transport *t,
> }
> }
>
> + if (virtio_transport_get_type(sk) != le16_to_cpu(pkt->hdr.type))
> + goto free_pkt;
No need to reset here, like a few lines
above in a seemingly similar condition?

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