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mptcp: implement MSG_TRUNC support

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The mentioned flag is currently silenlty ignored. This
change implements the TCP-like behaviour, dropping the
pending data up to the specified length.

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Sigend-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paolo Abeni 2021-04-23 11:17:06 -07:00 committed by David S. Miller
parent cb9d80f494
commit d976092ce1
1 changed files with 9 additions and 7 deletions
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16
net/mptcp/protocol.c
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@ -1739,7 +1739,7 @@ static void mptcp_wait_data(struct sock *sk, long *timeo)
static int __mptcp_recvmsg_mskq(struct mptcp_sock *msk,
struct msghdr *msg,
size_t len)
size_t len, int flags)
{
struct sk_buff *skb;
int copied = 0;
@ -1750,11 +1750,13 @@ static int __mptcp_recvmsg_mskq(struct mptcp_sock *msk,
u32 count = min_t(size_t, len - copied, data_len);
int err;
err = skb_copy_datagram_msg(skb, offset, msg, count);
if (unlikely(err < 0)) {
if (!copied)
return err;
break;
if (!(flags & MSG_TRUNC)) {
err = skb_copy_datagram_msg(skb, offset, msg, count);
if (unlikely(err < 0)) {
if (!copied)
return err;
break;
}
}
copied += count;
@ -1966,7 +1968,7 @@ static int mptcp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
while (copied < len) {
int bytes_read;
bytes_read = __mptcp_recvmsg_mskq(msk, msg, len - copied);
bytes_read = __mptcp_recvmsg_mskq(msk, msg, len - copied, flags);
if (unlikely(bytes_read < 0)) {
if (!copied)
copied = bytes_read;