63 	struct tcphdr *tcp;  member
98 		ctx->tcp = (struct tcphdr *)(ctx->ipv4 + 1);  in tcp_load_headers()
112 		ctx->tcp = (struct tcphdr *)(ctx->ipv6 + 1);  in tcp_load_headers()
118 	if (ctx->tcp + 1 > ctx->data_end)  in tcp_load_headers()
133 	if (ctx->tcp->doff < sizeof(*ctx->tcp) / 4)  in tcp_reload_headers()
136 	/* Needed to calculate csum and parse TCP options. */  in tcp_reload_headers()
137 	if (bpf_skb_change_tail(ctx->skb, data_len + 60 - ctx->tcp->doff * 4, 0))  in tcp_reload_headers()
146 		ctx->tcp = (struct tcphdr *)(ctx->ipv4 + 1);  in tcp_reload_headers()
150 		ctx->tcp = (struct tcphdr *)(ctx->ipv6 + 1);  in tcp_reload_headers()
153 	if ((void *)ctx->tcp + 60 > ctx->data_end)  in tcp_reload_headers()
164 				 ctx->tcp->doff * 4, IPPROTO_TCP, csum);  in tcp_v4_csum()
170 			       ctx->tcp->doff * 4, IPPROTO_TCP, csum);  in tcp_v6_csum()
180 	csum = bpf_csum_diff(0, 0, (void *)ctx->tcp, ctx->tcp->doff * 4, 0);  in tcp_validate_header()
248 		if (*opsize == TCPOLEN_MSS && ctx->tcp->syn && mss)  in tcp_parse_option()
253 		if (*opsize == TCPOLEN_WINDOW && ctx->tcp->syn && wscale) {  in tcp_parse_option()
265 			if (ctx->tcp->syn && ctx->attrs.rcv_tsecr)  in tcp_parse_option()
272 		if (*opsize == TCPOLEN_SACK_PERM && ctx->tcp->syn)  in tcp_parse_option()
286 	ctx->off = (__u8 *)(ctx->tcp + 1) - (__u8 *)ctx->data,  in tcp_parse_options()
306 	if (!ctx->tcp->ece || !ctx->tcp->cwr)  in tcp_validate_sysctl()
316 	u32 seq = bpf_ntohl(ctx->tcp->seq);  in tcp_prepare_cookie()
340 	second = (u64)seq << 32 | ctx->tcp->source << 16 | ctx->tcp->dest;  in tcp_prepare_cookie()
358 	if (ctx->attrs.tstamp_ok && ctx->tcp->ece && ctx->tcp->cwr)  in tcp_prepare_cookie()
366 	ctx->ptr32 = (__be32 *)(ctx->tcp + 1);  in tcp_write_options()
414 	swap(ctx->tcp->source, ctx->tcp->dest);  in tcp_handle_syn()
415 	ctx->tcp->check = 0;  in tcp_handle_syn()
416 	ctx->tcp->ack_seq = bpf_htonl(bpf_ntohl(ctx->tcp->seq) + 1);  in tcp_handle_syn()
417 	ctx->tcp->seq = bpf_htonl(ctx->cookie);  in tcp_handle_syn()
418 	ctx->tcp->doff = ((long)ctx->ptr32 - (long)ctx->tcp) >> 2;  in tcp_handle_syn()
419 	ctx->tcp->ack = 1;  in tcp_handle_syn()
420 	if (!ctx->attrs.tstamp_ok || !ctx->tcp->ece || !ctx->tcp->cwr)  in tcp_handle_syn()
421 		ctx->tcp->ece = 0;  in tcp_handle_syn()
422 	ctx->tcp->cwr = 0;  in tcp_handle_syn()
424 	csum = bpf_csum_diff(0, 0, (void *)ctx->tcp, ctx->tcp->doff * 4, 0);  in tcp_handle_syn()
430 		ctx->tcp->check = tcp_v4_csum(ctx, csum);  in tcp_handle_syn()
445 		ctx->tcp->check = tcp_v6_csum(ctx, csum);  in tcp_handle_syn()
448 		ctx->ipv6->payload_len = bpf_htons((long)ctx->ptr32 - (long)ctx->tcp);  in tcp_handle_syn()
464 	u32 cookie = bpf_ntohl(ctx->tcp->ack_seq) - 1;  in tcp_validate_cookie()
465 	u32 seq = bpf_ntohl(ctx->tcp->seq) - 1;  in tcp_validate_cookie()
476 	second = (u64)seq << 32 | ctx->tcp->source << 16 | ctx->tcp->dest;  in tcp_validate_cookie()
516 		tuple.ipv4.sport = ctx->tcp->source;  in tcp_handle_ack()
517 		tuple.ipv4.dport = ctx->tcp->dest;  in tcp_handle_ack()
522 		tuple.ipv6.sport = ctx->tcp->source;  in tcp_handle_ack()
523 		tuple.ipv6.dport = ctx->tcp->dest;  in tcp_handle_ack()
572 	if (ctx.tcp->rst)  in tcp_custom_syncookie()
575 	if (ctx.tcp->syn) {  in tcp_custom_syncookie()
576 		if (ctx.tcp->ack)  in tcp_custom_syncookie()