diff options
| author | Paolo Abeni <pabeni@redhat.com> | 2021-04-23 11:17:06 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2021-04-23 14:06:32 -0700 |
| commit | d976092ce1b04d634d408f475224347cfae81201 (patch) | |
| tree | 1d6fedac55b77ebb739e9777819a25e9f98c1bda /net/mptcp | |
| parent | cb9d80f4940ee5d4b7c7cad7418a6c893c6c4279 (diff) | |
mptcp: implement MSG_TRUNC support
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>
Diffstat (limited to 'net/mptcp')
| -rw-r--r-- | net/mptcp/protocol.c | 16 |
1 files changed, 9 insertions, 7 deletions
diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c index 1d5f23bd640c..ae08c563c712 100644 --- a/net/mptcp/protocol.c +++ b/net/mptcp/protocol.c @@ -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; |