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Commit b811580d authored by David Ahern's avatar David Ahern Committed by David S. Miller
Browse files

net: IPv6 fib lookup tracepoint 



Add tracepoint to show fib6 table lookups and result.

Signed-off-by: default avatarDavid Ahern <dsa@cumulusnetworks.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent e2f9dc3b

include/trace/events/fib6.h

0 → 100644
+76 −0
Original line number Diff line number Diff line 
#undef TRACE_SYSTEM

#define TRACE_SYSTEM fib6



#if !defined(_TRACE_FIB6_H) || defined(TRACE_HEADER_MULTI_READ)

#define _TRACE_FIB6_H



#include <linux/in6.h>

#include <net/flow.h>

#include <net/ip6_fib.h>

#include <linux/tracepoint.h>



TRACE_EVENT(fib6_table_lookup,



	TP_PROTO(const struct net *net, const struct rt6_info *rt,

		 u32 tb_id, const struct flowi6 *flp),



	TP_ARGS(net, rt, tb_id, flp),



	TP_STRUCT__entry(

		__field(	u32,	tb_id		)



		__field(	int,	oif		)

		__field(	int,	iif		)

		__field(	__u8,	tos		)

		__field(	__u8,	scope		)

		__field(	__u8,	flags		)

		__array(	__u8,	src,	16	)

		__array(	__u8,	dst,	16	)



		__dynamic_array(	char,	name,	IFNAMSIZ )

		__array(		__u8,	gw,	16	 )

	),



	TP_fast_assign(

		struct in6_addr *in6;



		__entry->tb_id = tb_id;

		__entry->oif = flp->flowi6_oif;

		__entry->iif = flp->flowi6_iif;

		__entry->tos = flp->flowi6_tos;

		__entry->scope = flp->flowi6_scope;

		__entry->flags = flp->flowi6_flags;



		in6 = (struct in6_addr *)__entry->src;

		*in6 = flp->saddr;



		in6 = (struct in6_addr *)__entry->dst;

		*in6 = flp->daddr;



		if (rt->rt6i_idev) {

			__assign_str(name, rt->rt6i_idev->dev->name);

		} else {

			__assign_str(name, "");

		}

		if (rt == net->ipv6.ip6_null_entry) {

			struct in6_addr in6_zero = {};



			in6 = (struct in6_addr *)__entry->gw;

			*in6 = in6_zero;



		} else if (rt) {

			in6 = (struct in6_addr *)__entry->gw;

			*in6 = rt->rt6i_gateway;

		}

	),



	TP_printk("table %3u oif %d iif %d src %pI6c dst %pI6c tos %d scope %d flags %x ==> dev %s gw %pI6c",

		  __entry->tb_id, __entry->oif, __entry->iif,

		  __entry->src, __entry->dst, __entry->tos, __entry->scope,

		  __entry->flags, __get_str(name), __entry->gw)

);



#endif /* _TRACE_FIB6_H */



/* This part must be outside protection */

#include <trace/define_trace.h>

net/core/net-traces.c

+4 −0
Original line number Diff line number Diff line
@@ -32,6 +32,10 @@ 
#include <trace/events/sock.h>

#include <trace/events/udp.h>

#include <trace/events/fib.h>

#if IS_ENABLED(CONFIG_IPV6)

#include <trace/events/fib6.h>

EXPORT_TRACEPOINT_SYMBOL_GPL(fib6_table_lookup);

#endif



EXPORT_TRACEPOINT_SYMBOL_GPL(kfree_skb);

net/ipv6/route.c

+10 −0
Original line number Diff line number Diff line
@@ -62,6 +62,7 @@ 
#include <net/lwtunnel.h>

#include <net/ip_tunnels.h>

#include <net/l3mdev.h>

#include <trace/events/fib6.h>



#include <asm/uaccess.h>
@@ -865,6 +866,9 @@ static struct rt6_info *ip6_pol_route_lookup(struct net *net, 
	}

	dst_use(&rt->dst, jiffies);

	read_unlock_bh(&table->tb6_lock);



	trace_fib6_table_lookup(net, rt, table->tb6_id, fl6);



	return rt;



}
@@ -1078,6 +1082,8 @@ static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, 
		read_unlock_bh(&table->tb6_lock);



		rt6_dst_from_metrics_check(rt);



		trace_fib6_table_lookup(net, rt, table->tb6_id, fl6);

		return rt;

	} else if (unlikely((fl6->flowi6_flags & FLOWI_FLAG_KNOWN_NH) &&

			    !(rt->rt6i_flags & RTF_GATEWAY))) {
@@ -1101,6 +1107,8 @@ static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, 
			uncached_rt = net->ipv6.ip6_null_entry;



		dst_hold(&uncached_rt->dst);



		trace_fib6_table_lookup(net, uncached_rt, table->tb6_id, fl6);

		return uncached_rt;



	} else {
@@ -1125,6 +1133,7 @@ static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, 
			dst_release(&rt->dst);

		}



		trace_fib6_table_lookup(net, pcpu_rt, table->tb6_id, fl6);

		return pcpu_rt;



	}
@@ -1474,6 +1483,7 @@ static struct rt6_info *__ip6_route_redirect(struct net *net, 


	read_unlock_bh(&table->tb6_lock);



	trace_fib6_table_lookup(net, rt, table->tb6_id, fl6);

	return rt;

};