From 0a6fa23dcb10eeb21adfd9955f7030f952a8122d Mon Sep 17 00:00:00 2001
From: "Eric W. Biederman" <ebiederm@xmission.com>
Date: Sat, 19 Oct 2013 16:27:03 -0700
Subject: [PATCH] ipv4: Use math to point per net sysctls into the appropriate
struct net.
Simplify maintenance of ipv4_net_table by using math to point the per
net sysctls into the appropriate struct net, instead of manually
reassinging all of the variables into hard coded table slots.
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
net/ipv4/sysctl_net_ipv4.c | 23 +++++------------------
1 file changed, 5 insertions(+), 18 deletions(-)
diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
index 69c6a8dbe09d..3a05e8123235 100644
--- a/net/ipv4/sysctl_net_ipv4.c
+++ b/net/ipv4/sysctl_net_ipv4.c
@@ -838,28 +838,15 @@ static __net_init int ipv4_sysctl_init_net(struct net *net)
table = ipv4_net_table;
if (!net_eq(net, &init_net)) {
+ int i;
+
table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
if (table == NULL)
goto err_alloc;
- table[0].data =
- &net->ipv4.sysctl_icmp_echo_ignore_all;
- table[1].data =
- &net->ipv4.sysctl_icmp_echo_ignore_broadcasts;
- table[2].data =
- &net->ipv4.sysctl_icmp_ignore_bogus_error_responses;
- table[3].data =
- &net->ipv4.sysctl_icmp_errors_use_inbound_ifaddr;
- table[4].data =
- &net->ipv4.sysctl_icmp_ratelimit;
- table[5].data =
- &net->ipv4.sysctl_icmp_ratemask;
- table[6].data =
- &net->ipv4.sysctl_ping_group_range;
- table[7].data =
- &net->ipv4.sysctl_tcp_ecn;
- table[8].data =
- &net->ipv4.sysctl_local_ports.range;
+ /* Update the variables to point into the current struct net */
+ for (i = 0; i < ARRAY_SIZE(ipv4_net_table) - 1; i++)
+ table[i].data += (void *)net - (void *)&init_net;
/* Don't export sysctls to unprivileged users */
if (net->user_ns != &init_user_ns)
--
2.20.1