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Commit 703fb94e authored by Steffen Klassert's avatar Steffen Klassert
Browse files

xfrm: Fix the gc threshold value for ipv4 



The xfrm gc threshold value depends on ip_rt_max_size. This
value was set to INT_MAX with the routing cache removal patch,
so we start doing garbage collecting when we have INT_MAX/2
IPsec routes cached. Fix this by going back to the static
threshold of 1024 routes.

Signed-off-by: default avatarSteffen Klassert <steffen.klassert@secunet.com>
parent a66fe165

include/net/xfrm.h

+1 −1
Original line number Diff line number Diff line
@@ -1351,7 +1351,7 @@ struct xfrm6_tunnel { 
};



extern void xfrm_init(void);

extern void xfrm4_init(int rt_hash_size);

extern void xfrm4_init(void);

extern int xfrm_state_init(struct net *net);

extern void xfrm_state_fini(struct net *net);

extern void xfrm4_state_init(void);

net/ipv4/route.c

+1 −1
Original line number Diff line number Diff line
@@ -2597,7 +2597,7 @@ int __init ip_rt_init(void) 
		pr_err("Unable to create route proc files\n");

#ifdef CONFIG_XFRM

	xfrm_init();

	xfrm4_init(ip_rt_max_size);

	xfrm4_init();

#endif

	rtnl_register(PF_INET, RTM_GETROUTE, inet_rtm_getroute, NULL, NULL);

net/ipv4/xfrm4_policy.c

+1 −12
Original line number Diff line number Diff line
@@ -279,19 +279,8 @@ static void __exit xfrm4_policy_fini(void) 
	xfrm_policy_unregister_afinfo(&xfrm4_policy_afinfo);

}



void __init xfrm4_init(int rt_max_size)

void __init xfrm4_init(void)

{

	/*

	 * Select a default value for the gc_thresh based on the main route

	 * table hash size.  It seems to me the worst case scenario is when

	 * we have ipsec operating in transport mode, in which we create a

	 * dst_entry per socket.  The xfrm gc algorithm starts trying to remove

	 * entries at gc_thresh, and prevents new allocations as 2*gc_thresh

	 * so lets set an initial xfrm gc_thresh value at the rt_max_size/2.

	 * That will let us store an ipsec connection per route table entry,

	 * and start cleaning when were 1/2 full

	 */

	xfrm4_dst_ops.gc_thresh = rt_max_size/2;

	dst_entries_init(&xfrm4_dst_ops);



	xfrm4_state_init();