net/netfilter/nf_conntrack_proto_tcp.c

275 static unsigned int get_conntrack_index(const struct tcphdr *tcph)
277 	if (tcph->rst) return TCP_RST_SET;
278 	else if (tcph->syn) return (tcph->ack ? TCP_SYNACK_SET : TCP_SYN_SET);
279 	else if (tcph->fin) return TCP_FIN_SET;
280 	else if (tcph->ack) return TCP_ACK_SET;
316 					 const struct tcphdr *tcph)
320 	return (seq + len - dataoff - tcph->doff*4
321 		+ (tcph->syn ? 1 : 0) + (tcph->fin ? 1 : 0));
335 			const struct tcphdr *tcph,
340 	int length = (tcph->doff*4) - sizeof(struct tcphdr);
392                      const struct tcphdr *tcph, __u32 *sack)
396 	int length = (tcph->doff*4) - sizeof(struct tcphdr);
459 			    const struct tcphdr *tcph,
470 	tcp_options(skb, dataoff, tcph, sender);
512 	      unsigned int dataoff, const struct tcphdr *tcph,
526 	seq = ntohl(tcph->seq);
527 	ack = sack = ntohl(tcph->ack_seq);
528 	win_raw = ntohs(tcph->window);
530 	end = segment_seq_plus_len(seq, skb->len, dataoff, tcph);
533 		tcp_sack(skb, dataoff, tcph, &sack);
544 		if (tcph->syn) {
546 					skb, dataoff, tcph,
548 			if (!tcph->ack)
576 	} else if (tcph->syn &&
589 				skb, dataoff, tcph,
592 		if (dir == IP_CT_DIR_REPLY && !tcph->ack)
596 	if (!(tcph->ack)) {
601 	} else if (((tcp_flag_word(tcph) & (TCP_FLAG_ACK|TCP_FLAG_RST)) ==
611 	if (tcph->rst && seq == 0 && state->state == TCP_CONNTRACK_SYN_SENT)
670 	if (!tcph->syn)
681 	if (tcph->ack) {