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Commit 2d564b0b authored by Ravinder Konka's avatar Ravinder Konka Committed by Gerrit - the friendly Code Review server
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net: core: Send ARP probe and trigger RTM_NEWNEIGH 



Send ARP probe and generate RTM_NEWNEIGH if the neighbor
state is not NUD_REACHABLE. Also featurize changes for
sending neighbor probe.

Change-Id: I633285b8e0cbcd49291d5e52136f11e20f2388bc
Acked-by: default avatarSneha <smaganah@qti.qualcomm.com>
Signed-off-by: default avatarMohammed Javid <mjavid@codeaurora.org>
parent eb73bc66

include/net/neighbour.h

+1 −0
Original line number Diff line number Diff line
@@ -64,6 +64,7 @@ enum { 
	NEIGH_VAR_GC_THRESH1,

	NEIGH_VAR_GC_THRESH2,

	NEIGH_VAR_GC_THRESH3,

	NEIGH_VAR_PROBE,

	NEIGH_VAR_MAX

};

net/core/neighbour.c

+22 −3
Original line number Diff line number Diff line
@@ -58,6 +58,7 @@ static void neigh_update_notify(struct neighbour *neigh, u32 nlmsg_pid); 
static int pneigh_ifdown_and_unlock(struct neigh_table *tbl,

				    struct net_device *dev);



static unsigned int neigh_probe_enable;

#ifdef CONFIG_PROC_FS

static const struct file_operations neigh_stat_seq_fops;

#endif
@@ -1308,9 +1309,20 @@ struct neighbour *neigh_event_ns(struct neigh_table *tbl, 
{

	struct neighbour *neigh = __neigh_lookup(tbl, saddr, dev,

						 lladdr || !dev->addr_len);

	if (neigh)

	if (neigh) {

		if (neigh_probe_enable) {

			if (!(neigh->nud_state == NUD_REACHABLE)) {

				neigh_update(neigh, lladdr, NUD_STALE,

					     NEIGH_UPDATE_F_OVERRIDE, 0);

				write_lock(&neigh->lock);

				neigh_probe(neigh);

				neigh_update_notify(neigh, 0);

			}

		} else {

			neigh_update(neigh, lladdr, NUD_STALE,

				     NEIGH_UPDATE_F_OVERRIDE, 0);

		}

	}

	return neigh;

}

EXPORT_SYMBOL(neigh_event_ns);
@@ -3165,6 +3177,12 @@ static struct neigh_sysctl_table { 
			.extra2		= &int_max,

			.proc_handler	= proc_dointvec_minmax,

		},

		[NEIGH_VAR_PROBE] = {

			.procname	= "neigh_probe",

			.maxlen		= sizeof(int),

			.mode		= 0644,

			.proc_handler	= proc_dointvec,

		},

		{},

	},

};
@@ -3200,6 +3218,7 @@ int neigh_sysctl_register(struct net_device *dev, struct neigh_parms *p, 
		t->neigh_vars[NEIGH_VAR_GC_THRESH1].data = &tbl->gc_thresh1;

		t->neigh_vars[NEIGH_VAR_GC_THRESH2].data = &tbl->gc_thresh2;

		t->neigh_vars[NEIGH_VAR_GC_THRESH3].data = &tbl->gc_thresh3;

		t->neigh_vars[NEIGH_VAR_PROBE].data  = &neigh_probe_enable;

	}



	if (handler) {