tfo.stp
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Authored by • ema on Aug 22 2016, 11:25 AM.

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	F4384472: tfo.stp
	Aug 22 2016, 11:25 AM

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	#! /usr/bin/env stap

	function printconn(skb) {
	iphdr = __get_skb_iphdr(skb)
	tcphdr = __get_skb_tcphdr(skb)
	daddr = format_ipaddr(__ip_skb_daddr(iphdr), AF_INET())
	saddr = format_ipaddr(__ip_skb_saddr(iphdr), AF_INET())
	dport = __tcp_skb_dport(tcphdr)
	sport = __tcp_skb_sport(tcphdr)

	printf(" TFO connection %s:%d -> %s:%d\n", saddr, sport, daddr, dport);
	}

	probe kernel.function("tcp_try_fastopen").return {
	if ($foc->len > 0) {
	if ($return) {
	printf("Successful");
	} else {
	printf("Failed");
	}
	printconn($skb);
	}
	}

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