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Commit 5941521c authored by Song Liu's avatar Song Liu Committed by David S. Miller
Browse files

tcp: add tracepoint trace_tcp_receive_reset 



New tracepoint trace_tcp_receive_reset is added and called from
tcp_reset(). This tracepoint is define with a new class tcp_event_sk.

Signed-off-by: default avatarSong Liu <songliubraving@fb.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent c24b14c4

include/trace/events/tcp.h

+66 −0
Original line number Diff line number Diff line
@@ -88,6 +88,72 @@ DEFINE_EVENT(tcp_event_sk_skb, tcp_send_reset, 
	TP_ARGS(sk, skb)

);



/*

 * tcp event with arguments sk

 *

 * Note: this class requires a valid sk pointer.

 */

DECLARE_EVENT_CLASS(tcp_event_sk,



	TP_PROTO(const struct sock *sk),



	TP_ARGS(sk),



	TP_STRUCT__entry(

		__field(const void *, skaddr)

		__field(__u16, sport)

		__field(__u16, dport)

		__array(__u8, saddr, 4)

		__array(__u8, daddr, 4)

		__array(__u8, saddr_v6, 16)

		__array(__u8, daddr_v6, 16)

	),



	TP_fast_assign(

		struct inet_sock *inet = inet_sk(sk);

		struct in6_addr *pin6;

		__be32 *p32;



		__entry->skaddr = sk;



		__entry->sport = ntohs(inet->inet_sport);

		__entry->dport = ntohs(inet->inet_dport);



		p32 = (__be32 *) __entry->saddr;

		*p32 = inet->inet_saddr;



		p32 = (__be32 *) __entry->daddr;

		*p32 =  inet->inet_daddr;



#if IS_ENABLED(CONFIG_IPV6)

		if (sk->sk_family == AF_INET6) {

			pin6 = (struct in6_addr *)__entry->saddr_v6;

			*pin6 = sk->sk_v6_rcv_saddr;

			pin6 = (struct in6_addr *)__entry->daddr_v6;

			*pin6 = sk->sk_v6_daddr;

		} else

#endif

		{

			pin6 = (struct in6_addr *)__entry->saddr_v6;

			ipv6_addr_set_v4mapped(inet->inet_saddr, pin6);

			pin6 = (struct in6_addr *)__entry->daddr_v6;

			ipv6_addr_set_v4mapped(inet->inet_daddr, pin6);

		}

	),



	TP_printk("sport=%hu dport=%hu saddr=%pI4 daddr=%pI4 saddrv6=%pI6c daddrv6=%pI6c",

		  __entry->sport, __entry->dport,

		  __entry->saddr, __entry->daddr,

		  __entry->saddr_v6, __entry->daddr_v6)

);



DEFINE_EVENT(tcp_event_sk, tcp_receive_reset,



	TP_PROTO(const struct sock *sk),



	TP_ARGS(sk)

);



#endif /* _TRACE_TCP_H */



/* This part must be outside protection */

net/ipv4/tcp_input.c

+3 −0
Original line number Diff line number Diff line
@@ -75,6 +75,7 @@ 
#include <linux/ipsec.h>

#include <asm/unaligned.h>

#include <linux/errqueue.h>

#include <trace/events/tcp.h>



int sysctl_tcp_fack __read_mostly;

int sysctl_tcp_max_reordering __read_mostly = 300;
@@ -4010,6 +4011,8 @@ static inline bool tcp_sequence(const struct tcp_sock *tp, u32 seq, u32 end_seq) 
/* When we get a reset we do this. */

void tcp_reset(struct sock *sk)

{

	trace_tcp_receive_reset(sk);



	/* We want the right error as BSD sees it (and indeed as we do). */

	switch (sk->sk_state) {

	case TCP_SYN_SENT: