Commit e6a3e443 authored by Alexander Aring's avatar Alexander Aring Committed by David S. Miller
Browse files

net: sock: add trace for socket errors 



This patch will add tracers to trace inet socket errors only. A user
space monitor application can track connection errors indepedent from
socket lifetime and do additional handling. For example a cluster
manager can fence a node if errors occurs in a specific heuristic.

Signed-off-by: default avatarAlexander Aring <aahringo@redhat.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent e3ae2365

include/trace/events/sock.h

+60 −0
Original line number Diff line number Diff line
@@ -201,6 +201,66 @@ TRACE_EVENT(inet_sock_set_state, 
			show_tcp_state_name(__entry->newstate))

);



TRACE_EVENT(inet_sk_error_report,



	TP_PROTO(const struct sock *sk),



	TP_ARGS(sk),



	TP_STRUCT__entry(

		__field(int, error)

		__field(__u16, sport)

		__field(__u16, dport)

		__field(__u16, family)

		__field(__u16, protocol)

		__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->error = sk->sk_err;

		__entry->family = sk->sk_family;

		__entry->protocol = sk->sk_protocol;

		__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("family=%s protocol=%s sport=%hu dport=%hu saddr=%pI4 daddr=%pI4 saddrv6=%pI6c daddrv6=%pI6c error=%d",

		  show_family_name(__entry->family),

		  show_inet_protocol_name(__entry->protocol),

		  __entry->sport, __entry->dport,

		  __entry->saddr, __entry->daddr,

		  __entry->saddr_v6, __entry->daddr_v6,

		  __entry->error)

);



#endif /* _TRACE_SOCK_H */



/* This part must be outside protection */

net/core/sock.c

+10 −0
Original line number Diff line number Diff line
@@ -334,6 +334,16 @@ EXPORT_SYMBOL(__sk_backlog_rcv); 
void sk_error_report(struct sock *sk)

{

	sk->sk_error_report(sk);



	switch (sk->sk_family) {

	case AF_INET:

		fallthrough;

	case AF_INET6:

		trace_inet_sk_error_report(sk);

		break;

	default:

		break;

	}

}

EXPORT_SYMBOL(sk_error_report);