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[tcp] Avoid setting PSH flag when SYN flag is set

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Some firewall devices seem to regard SYN,PSH as an invalid flag
combination and reject the packet.  Fix by setting PSH only if SYN is
not set.

Reported-by: DSE Incorporated <dseinc@gmail.com>
This commit is contained in:
Michael Brown 2009-03-10 08:15:47 +00:00
parent 4397a2a4ca
commit 3ed468e0c5
1 changed files with 3 additions and 1 deletions
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4
src/net/tcp.c
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@ -471,6 +471,8 @@ static int tcp_xmit ( struct tcp_connection *tcp, int force_send ) {
tsopt->tsopt.tsval = ntohl ( currticks() );
tsopt->tsopt.tsecr = ntohl ( tcp->ts_recent );
}
if ( ! ( flags & TCP_SYN ) )
flags |= TCP_PSH;
tcphdr = iob_push ( iobuf, sizeof ( *tcphdr ) );
memset ( tcphdr, 0, sizeof ( *tcphdr ) );
tcphdr->src = tcp->local_port;
@ -478,7 +480,7 @@ static int tcp_xmit ( struct tcp_connection *tcp, int force_send ) {
tcphdr->seq = htonl ( tcp->snd_seq );
tcphdr->ack = htonl ( tcp->rcv_ack );
tcphdr->hlen = ( ( payload - iobuf->data ) << 2 );
tcphdr->flags = ( flags | TCP_PSH );
tcphdr->flags = flags;
tcphdr->win = htons ( tcp->rcv_win );
tcphdr->csum = tcpip_chksum ( iobuf->data, iob_len ( iobuf ) );