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

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>
pull/1/head
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 ) );