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Date: Mon, 18 Apr 2016 14:41:10 +0300
From: Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
To: netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>
Cc: linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] 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@...dex-team.ru>
---
include/linux/ipv6.h | 3 ++-
net/ipv6/addrconf.c | 43 +++++++++++++++++--------------------------
2 files changed, 19 insertions(+), 27 deletions(-)
diff --git a/include/linux/ipv6.h b/include/linux/ipv6.h
index 7edc14fb66b6..58d6e158755f 100644
--- a/include/linux/ipv6.h
+++ b/include/linux/ipv6.h
@@ -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 {
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 27aed1afcf81..8a724c7136b0 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -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);
@@ -5618,13 +5617,7 @@ 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,
@@ -5942,52 +5935,50 @@ 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)
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