263 static void tcp_ecn_rcv_synack(struct tcp_sock *tp, const struct tcphdr *th)  in tcp_ecn_rcv_synack()  argument
265 	if ((tp->ecn_flags & TCP_ECN_OK) && (!th->ece || th->cwr))  in tcp_ecn_rcv_synack()
269 static void tcp_ecn_rcv_syn(struct tcp_sock *tp, const struct tcphdr *th)  in tcp_ecn_rcv_syn()  argument
271 	if ((tp->ecn_flags & TCP_ECN_OK) && (!th->ece || !th->cwr))  in tcp_ecn_rcv_syn()
275 static bool tcp_ecn_rcv_ecn_echo(const struct tcp_sock *tp, const struct tcphdr *th)  in tcp_ecn_rcv_ecn_echo()  argument
277 	if (th->ece && !th->syn && (tp->ecn_flags & TCP_ECN_OK))  in tcp_ecn_rcv_ecn_echo()
3702 	const struct tcphdr *th = tcp_hdr(skb);  in tcp_parse_options()  local
3703 	int length = (th->doff * 4) - sizeof(struct tcphdr);  in tcp_parse_options()
3705 	ptr = (const unsigned char *)(th + 1);  in tcp_parse_options()
3726 				if (opsize == TCPOLEN_MSS && th->syn && !estab) {  in tcp_parse_options()
3737 				if (opsize == TCPOLEN_WINDOW && th->syn &&  in tcp_parse_options()
3760 				if (opsize == TCPOLEN_SACK_PERM && th->syn &&  in tcp_parse_options()
3771 					TCP_SKB_CB(skb)->sacked = (ptr - 2) - (unsigned char *)th;  in tcp_parse_options()
3785 					ptr, th->syn, foc, false);  in tcp_parse_options()
3797 						ptr + 2, th->syn, foc, true);  in tcp_parse_options()
3808 static bool tcp_parse_aligned_timestamp(struct tcp_sock *tp, const struct tcphdr *th)  in tcp_parse_aligned_timestamp()  argument
3810 	const __be32 *ptr = (const __be32 *)(th + 1);  in tcp_parse_aligned_timestamp()
3831 				   const struct tcphdr *th, struct tcp_sock *tp)  in tcp_fast_parse_options()  argument
3836 	if (th->doff == (sizeof(*th) / 4)) {  in tcp_fast_parse_options()
3840 		   th->doff == ((sizeof(*th) + TCPOLEN_TSTAMP_ALIGNED) / 4)) {  in tcp_fast_parse_options()
3841 		if (tcp_parse_aligned_timestamp(tp, th))  in tcp_fast_parse_options()
3856 const u8 *tcp_parse_md5sig_option(const struct tcphdr *th)  in tcp_parse_md5sig_option()  argument
3858 	int length = (th->doff << 2) - sizeof(*th);  in tcp_parse_md5sig_option()
3859 	const u8 *ptr = (const u8 *)(th + 1);  in tcp_parse_md5sig_option()
3916 	const struct tcphdr *th = tcp_hdr(skb);  in tcp_disordered_ack()  local
3921 		(th->ack && seq == TCP_SKB_CB(skb)->end_seq && seq == tp->rcv_nxt) &&  in tcp_disordered_ack()
3927 		!tcp_may_update_window(tp, ack, seq, ntohs(th->window) << tp->rx_opt.snd_wscale) &&  in tcp_disordered_ack()
4993 static void tcp_check_urg(struct sock *sk, const struct tcphdr *th)  in tcp_check_urg()  argument
4996 	u32 ptr = ntohs(th->urg_ptr);  in tcp_check_urg()
5000 	ptr += ntohl(th->seq);  in tcp_check_urg()
5059 static void tcp_urg(struct sock *sk, struct sk_buff *skb, const struct tcphdr *th)  in tcp_urg()  argument
5064 	if (th->urg)  in tcp_urg()
5065 		tcp_check_urg(sk, th);  in tcp_urg()
5069 		u32 ptr = tp->urg_seq - ntohl(th->seq) + (th->doff * 4) -  in tcp_urg()
5070 			  th->syn;  in tcp_urg()
5132 				  const struct tcphdr *th, int syn_inerr)  in tcp_validate_incoming()  argument
5137 	if (tcp_fast_parse_options(skb, th, tp) && tp->rx_opt.saw_tstamp &&  in tcp_validate_incoming()
5139 		if (!th->rst) {  in tcp_validate_incoming()
5158 		if (!th->rst) {  in tcp_validate_incoming()
5159 			if (th->syn)  in tcp_validate_incoming()
5170 	if (th->rst) {  in tcp_validate_incoming()
5189 	if (th->syn) {  in tcp_validate_incoming()
5229 			 const struct tcphdr *th, unsigned int len)  in tcp_rcv_established()  argument
5261 	if ((tcp_flag_word(th) & TCP_HP_BITS) == tp->pred_flags &&  in tcp_rcv_established()
5274 			if (!tcp_parse_aligned_timestamp(tp, th))  in tcp_rcv_established()
5385 	if (len < (th->doff << 2) || tcp_checksum_complete_user(sk, skb))  in tcp_rcv_established()
5388 	if (!th->ack && !th->rst && !th->syn)  in tcp_rcv_established()
5395 	if (!tcp_validate_incoming(sk, skb, th, 1))  in tcp_rcv_established()
5405 	tcp_urg(sk, skb, th);  in tcp_rcv_established()
5518 					 const struct tcphdr *th)  in tcp_rcv_synsent_state_process()  argument
5529 	if (th->ack) {  in tcp_rcv_synsent_state_process()
5557 		if (th->rst) {  in tcp_rcv_synsent_state_process()
5569 		if (!th->syn)  in tcp_rcv_synsent_state_process()
5579 		tcp_ecn_rcv_synack(tp, th);  in tcp_rcv_synsent_state_process()
5593 		tp->snd_wnd = ntohs(th->window);  in tcp_rcv_synsent_state_process()
5657 	if (th->rst) {  in tcp_rcv_synsent_state_process()
5672 	if (th->syn) {  in tcp_rcv_synsent_state_process()
5695 		tp->snd_wnd    = ntohs(th->window);  in tcp_rcv_synsent_state_process()
5699 		tcp_ecn_rcv_syn(tp, th);  in tcp_rcv_synsent_state_process()
5749 	const struct tcphdr *th = tcp_hdr(skb);  in tcp_rcv_state_process()  local
5761 		if (th->ack)  in tcp_rcv_state_process()
5764 		if (th->rst)  in tcp_rcv_state_process()
5767 		if (th->syn) {  in tcp_rcv_state_process()
5768 			if (th->fin)  in tcp_rcv_state_process()
5796 		queued = tcp_rcv_synsent_state_process(sk, skb, th);  in tcp_rcv_state_process()
5801 		tcp_urg(sk, skb, th);  in tcp_rcv_state_process()
5816 	if (!th->ack && !th->rst && !th->syn)  in tcp_rcv_state_process()
5819 	if (!tcp_validate_incoming(sk, skb, th, 0))  in tcp_rcv_state_process()
5861 		tp->snd_wnd = ntohs(th->window) << tp->rx_opt.snd_wscale;  in tcp_rcv_state_process()
5929 		     after(TCP_SKB_CB(skb)->end_seq - th->fin, tp->rcv_nxt))) {  in tcp_rcv_state_process()
5938 		} else if (th->fin || sock_owned_by_user(sk)) {  in tcp_rcv_state_process()
5970 	tcp_urg(sk, skb, th);  in tcp_rcv_state_process()
5987 			    after(TCP_SKB_CB(skb)->end_seq - th->fin, tp->rcv_nxt)) {  in tcp_rcv_state_process()
6045 	const struct tcphdr *th = tcp_hdr(skb);  in tcp_ecn_create_request()  local
6047 	bool th_ecn = th->ece && th->cwr;  in tcp_ecn_create_request()