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net/ipv6/addrconf: simplify sysctl registration 

Struct ctl_table_header holds pointer to sysctl table which could be used
for freeing it after unregistration. IPv4 sysctls already use that.
Remove redundant NULL assignment: ndev allocated using kzalloc.

This also saves some bytes: sysctl table could be shorter than
DEVCONF_MAX+1 if some options are disable in config.

Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Konstantin Khlebnikov 2016-04-18 14:41:10 +03:00 committed by David S. Miller
parent 35c5845957
commit 607ea7cda6
2 changed files with 19 additions and 27 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
include/linux/ipv6.h
View File

@ -63,7 +63,8 @@ struct ipv6_devconf {
} stable_secret;
__s32 use_oif_addrs_only;
__s32 keep_addr_on_down;
void *sysctl;
struct ctl_table_header *sysctl_header;
};
struct ipv6_params {

43
net/ipv6/addrconf.c
View File

@ -359,7 +359,6 @@ static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64;
ndev->cnf.mtu6 = dev->mtu;
ndev->cnf.sysctl = NULL;
ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
if (!ndev->nd_parms) {
kfree(ndev);
@ -5620,13 +5619,7 @@ int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
return ret;
}
static struct addrconf_sysctl_table
{
struct ctl_table_header *sysctl_header;
struct ctl_table addrconf_vars[DEVCONF_MAX+1];
} addrconf_sysctl __read_mostly = {
.sysctl_header = NULL,
.addrconf_vars = {
static const struct ctl_table addrconf_sysctl[] = {
{
.procname = "forwarding",
.data = &ipv6_devconf.forwarding,
@ -5944,52 +5937,50 @@ static struct addrconf_sysctl_table
{
/* sentinel */
}
},
};
static int __addrconf_sysctl_register(struct net *net, char *dev_name,
struct inet6_dev *idev, struct ipv6_devconf *p)
{
int i;
struct addrconf_sysctl_table *t;
struct ctl_table *table;
char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
if (!t)
table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
if (!table)
goto out;
for (i = 0; t->addrconf_vars[i].data; i++) {
t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
t->addrconf_vars[i].extra2 = net;
for (i = 0; table[i].data; i++) {
table[i].data += (char *)p - (char *)&ipv6_devconf;
table[i].extra1 = idev; /* embedded; no ref */
table[i].extra2 = net;
}
snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
if (!t->sysctl_header)
p->sysctl_header = register_net_sysctl(net, path, table);
if (!p->sysctl_header)
goto free;
p->sysctl = t;
return 0;
free:
kfree(t);
kfree(table);
out:
return -ENOBUFS;
}
static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
{
struct addrconf_sysctl_table *t;
struct ctl_table *table;
if (!p->sysctl)
if (!p->sysctl_header)
return;
t = p->sysctl;
p->sysctl = NULL;
unregister_net_sysctl_table(t->sysctl_header);
kfree(t);
table = p->sysctl_header->ctl_table_arg;
unregister_net_sysctl_table(p->sysctl_header);
p->sysctl_header = NULL;
kfree(table);
}
static int addrconf_sysctl_register(struct inet6_dev *idev)