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net neighbour: Convert to use register_net_sysctl

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Using an ascii path to register_net_sysctl as opposed to the slightly
awkward ctl_path allows for much simpler code.

We no longer need to malloc dev_name to keep it alive the length of our
sysctl register instead we can use a small temporary buffer on the
stack.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Acked-by: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric W. Biederman 2012-04-19 13:38:03 +00:00 committed by David S. Miller
parent 6dceb03687
commit 8f40a1f982
1 changed files with 6 additions and 27 deletions
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33
net/core/neighbour.c
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@ -2799,7 +2799,6 @@ enum {
static struct neigh_sysctl_table {
struct ctl_table_header *sysctl_header;
struct ctl_table neigh_vars[NEIGH_VAR_MAX + 1];
char *dev_name;
} neigh_sysctl_template __read_mostly = {
.neigh_vars = {
[NEIGH_VAR_MCAST_PROBE] = {
@ -2925,19 +2924,7 @@ int neigh_sysctl_register(struct net_device *dev, struct neigh_parms *p,
{
struct neigh_sysctl_table *t;
const char *dev_name_source = NULL;
#define NEIGH_CTL_PATH_ROOT 0
#define NEIGH_CTL_PATH_PROTO 1
#define NEIGH_CTL_PATH_NEIGH 2
#define NEIGH_CTL_PATH_DEV 3
struct ctl_path neigh_path[] = {
{ .procname = "net", },
{ .procname = "proto", },
{ .procname = "neigh", },
{ .procname = "default", },
{ },
};
char neigh_path[ sizeof("net//neigh/") + IFNAMSIZ + IFNAMSIZ ];
t = kmemdup(&neigh_sysctl_template, sizeof(*t), GFP_KERNEL);
if (!t)
@ -2965,7 +2952,7 @@ int neigh_sysctl_register(struct net_device *dev, struct neigh_parms *p,
memset(&t->neigh_vars[NEIGH_VAR_GC_INTERVAL], 0,
sizeof(t->neigh_vars[NEIGH_VAR_GC_INTERVAL]));
} else {
dev_name_source = neigh_path[NEIGH_CTL_PATH_DEV].procname;
dev_name_source = "default";
t->neigh_vars[NEIGH_VAR_GC_INTERVAL].data = (int *)(p + 1);
t->neigh_vars[NEIGH_VAR_GC_THRESH1].data = (int *)(p + 1) + 1;
t->neigh_vars[NEIGH_VAR_GC_THRESH2].data = (int *)(p + 1) + 2;
@ -2988,23 +2975,16 @@ int neigh_sysctl_register(struct net_device *dev, struct neigh_parms *p,
t->neigh_vars[NEIGH_VAR_BASE_REACHABLE_TIME_MS].extra1 = dev;
}
t->dev_name = kstrdup(dev_name_source, GFP_KERNEL);
if (!t->dev_name)
goto free;
neigh_path[NEIGH_CTL_PATH_DEV].procname = t->dev_name;
neigh_path[NEIGH_CTL_PATH_PROTO].procname = p_name;
snprintf(neigh_path, sizeof(neigh_path), "net/%s/neigh/%s",
p_name, dev_name_source);
t->sysctl_header =
register_net_sysctl_table(neigh_parms_net(p), neigh_path, t->neigh_vars);
register_net_sysctl(neigh_parms_net(p), neigh_path, t->neigh_vars);
if (!t->sysctl_header)
goto free_procname;
goto free;
p->sysctl_table = t;
return 0;
free_procname:
kfree(t->dev_name);
free:
kfree(t);
err:
@ -3018,7 +2998,6 @@ void neigh_sysctl_unregister(struct neigh_parms *p)
struct neigh_sysctl_table *t = p->sysctl_table;
p->sysctl_table = NULL;
unregister_net_sysctl_table(t->sysctl_header);
kfree(t->dev_name);
kfree(t);
}
}