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#! /usr/bin/env stap
#################################################################
# tcp_retransmit.stp
# Author: Yang Bingwu (detailyang) <detailyang@gmail.com>
# This systemtap script will prints the tcp retransmission packet
#################################################################
global record%
probe begin {
log("Printing tcp retransmission")
}
probe kernel.function("tcp_retransmit_skb") {
rto = tcp_get_info_rto($sk)
saddr = format_ipaddr(__ip_sock_saddr($sk), __ip_sock_family($sk))
daddr = format_ipaddr(__ip_sock_daddr($sk), __ip_sock_family($sk))
sport = __tcp_sock_sport($sk)
dport = __tcp_sock_dport($sk)
lastrto = record[saddr, sport, daddr, dport]
state = tcp_ts_get_info_state($sk)
if (lastrto != rto) {
if (lastrto) {
printf("%s:%d => %s:%d STATE:%s RTO:%d -> %d (ms)\n", saddr, sport,
daddr, dport, tcp_sockstate_str(state), lastrto/1000, rto/1000)
} else {
printf("%s:%d => %s:%d STATE:%s RTO:%d (ms)\n", saddr, sport,
daddr, dport, tcp_sockstate_str(state), rto/1000)
}
}
record[saddr, sport, daddr, dport] = rto
}
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