61 	struct iphdr *ipv4;  member
84 		ctx->ipv4 = (struct iphdr *)(ctx->eth + 1);  in tcp_load_headers()
86 		if (ctx->ipv4 + 1 > ctx->data_end)  in tcp_load_headers()
89 		if (ctx->ipv4->ihl != sizeof(*ctx->ipv4) / 4)  in tcp_load_headers()
92 		if (ctx->ipv4->version != 4)  in tcp_load_headers()
95 		if (ctx->ipv4->protocol != IPPROTO_TCP)  in tcp_load_headers()
98 		ctx->tcp = (struct tcphdr *)(ctx->ipv4 + 1);  in tcp_load_headers()
143 	if (ctx->ipv4) {  in tcp_reload_headers()
144 		ctx->ipv4 = (struct iphdr *)(ctx->eth + 1);  in tcp_reload_headers()
146 		ctx->tcp = (struct tcphdr *)(ctx->ipv4 + 1);  in tcp_reload_headers()
148 		ctx->ipv4 = NULL;  in tcp_reload_headers()
163 	return csum_tcpudp_magic(ctx->ipv4->saddr, ctx->ipv4->daddr,  in tcp_v4_csum()
184 	if (ctx->ipv4) {  in tcp_validate_header()
187 		csum = bpf_csum_diff(0, 0, (void *)ctx->ipv4, ctx->ipv4->ihl * 4, 0);  in tcp_validate_header()
293 	if ((ctx->ipv4 && ctx->attrs.mss != MSS_LOCAL_IPV4) ||  in tcp_validate_sysctl()
321 	if (ctx->ipv4) {  in tcp_prepare_cookie()
328 		first = (u64)ctx->ipv4->saddr << 32 | ctx->ipv4->daddr;  in tcp_prepare_cookie()
428 	if (ctx->ipv4) {  in tcp_handle_syn()
429 		swap(ctx->ipv4->saddr, ctx->ipv4->daddr);  in tcp_handle_syn()
432 		ctx->ipv4->check = 0;  in tcp_handle_syn()
433 		ctx->ipv4->tos = 0;  in tcp_handle_syn()
434 		ctx->ipv4->tot_len = bpf_htons((long)ctx->ptr32 - (long)ctx->ipv4);  in tcp_handle_syn()
435 		ctx->ipv4->id = 0;  in tcp_handle_syn()
436 		ctx->ipv4->ttl = 64;  in tcp_handle_syn()
438 		csum = bpf_csum_diff(0, 0, (void *)ctx->ipv4, sizeof(*ctx->ipv4), 0);  in tcp_handle_syn()
442 		ctx->ipv4->check = csum_fold(csum);  in tcp_handle_syn()
470 	if (ctx->ipv4)  in tcp_validate_cookie()
471 		first = (u64)ctx->ipv4->saddr << 32 | ctx->ipv4->daddr;  in tcp_validate_cookie()
489 	if (ctx->ipv4)  in tcp_validate_cookie()
513 	if (ctx->ipv4) {  in tcp_handle_ack()
514 		tuple.ipv4.saddr = ctx->ipv4->saddr;  in tcp_handle_ack()
515 		tuple.ipv4.daddr = ctx->ipv4->daddr;  in tcp_handle_ack()
516 		tuple.ipv4.sport = ctx->tcp->source;  in tcp_handle_ack()
517 		tuple.ipv4.dport = ctx->tcp->dest;  in tcp_handle_ack()
518 		tuple_size = sizeof(tuple.ipv4);  in tcp_handle_ack()