From 760f2d0186225f06d46e07232d65219c5055cad3 Mon Sep 17 00:00:00 2001 From: Daniel Lezcano Date: Thu, 10 Jan 2008 02:53:43 -0800 Subject: [PATCH] [NETNS][IPV6]: Make multiple instance of sysctl tables. Each network namespace wants its own set of sysctl value, eg. we should not be able from a namespace to set a sysctl value for another namespace , especially for the initial network namespace. This patch duplicates the sysctl table when we register a new network namespace for ipv6. The duplicated table are postfixed with the "template" word to notify the developper the table is cloned. Signed-off-by: Daniel Lezcano Signed-off-by: David S. Miller --- include/net/ipv6.h | 4 +-- include/net/netns/ipv6.h | 9 +++++ net/ipv6/icmp.c | 12 ++++++- net/ipv6/route.c | 11 ++++++- net/ipv6/sysctl_net_ipv6.c | 67 ++++++++++++++++++++++++++++++++------ 5 files changed, 89 insertions(+), 14 deletions(-) diff --git a/include/net/ipv6.h b/include/net/ipv6.h index 3e086f8bb4..5519035491 100644 --- a/include/net/ipv6.h +++ b/include/net/ipv6.h @@ -619,8 +619,8 @@ static inline int snmp6_unregister_dev(struct inet6_dev *idev) #endif #ifdef CONFIG_SYSCTL -extern ctl_table ipv6_route_table[]; -extern ctl_table ipv6_icmp_table[]; +extern ctl_table ipv6_route_table_template[]; +extern ctl_table ipv6_icmp_table_template[]; extern int ipv6_sysctl_register(void); extern void ipv6_sysctl_unregister(void); diff --git a/include/net/netns/ipv6.h b/include/net/netns/ipv6.h index 6f82046e30..58fbf30d9f 100644 --- a/include/net/netns/ipv6.h +++ b/include/net/netns/ipv6.h @@ -5,6 +5,15 @@ #ifndef __NETNS_IPV6_H__ #define __NETNS_IPV6_H__ +struct ctl_table_header; + +struct netns_sysctl_ipv6 { +#ifdef CONFIG_SYSCTL + struct ctl_table_header *table; +#endif +}; + struct netns_ipv6 { + struct netns_sysctl_ipv6 sysctl; }; #endif diff --git a/net/ipv6/icmp.c b/net/ipv6/icmp.c index c3bbd86873..dfe3b37c43 100644 --- a/net/ipv6/icmp.c +++ b/net/ipv6/icmp.c @@ -907,7 +907,7 @@ int icmpv6_err_convert(int type, int code, int *err) EXPORT_SYMBOL(icmpv6_err_convert); #ifdef CONFIG_SYSCTL -ctl_table ipv6_icmp_table[] = { +ctl_table ipv6_icmp_table_template[] = { { .ctl_name = NET_IPV6_ICMP_RATELIMIT, .procname = "ratelimit", @@ -918,5 +918,15 @@ ctl_table ipv6_icmp_table[] = { }, { .ctl_name = 0 }, }; + +struct ctl_table *ipv6_icmp_sysctl_init(struct net *net) +{ + struct ctl_table *table; + + table = kmemdup(ipv6_icmp_table_template, + sizeof(ipv6_icmp_table_template), + GFP_KERNEL); + return table; +} #endif diff --git a/net/ipv6/route.c b/net/ipv6/route.c index b80ef57842..0c7382f4fb 100644 --- a/net/ipv6/route.c +++ b/net/ipv6/route.c @@ -2409,7 +2409,7 @@ int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write, struct file * filp, return -EINVAL; } -ctl_table ipv6_route_table[] = { +ctl_table ipv6_route_table_template[] = { { .procname = "flush", .data = &flush_delay, @@ -2499,6 +2499,15 @@ ctl_table ipv6_route_table[] = { { .ctl_name = 0 } }; +struct ctl_table *ipv6_route_sysctl_init(struct net *net) +{ + struct ctl_table *table; + + table = kmemdup(ipv6_route_table_template, + sizeof(ipv6_route_table_template), + GFP_KERNEL); + return table; +} #endif int __init ip6_route_init(void) diff --git a/net/ipv6/sysctl_net_ipv6.c b/net/ipv6/sysctl_net_ipv6.c index 7329decf1f..7970f3366f 100644 --- a/net/ipv6/sysctl_net_ipv6.c +++ b/net/ipv6/sysctl_net_ipv6.c @@ -14,20 +14,23 @@ #include #include -static ctl_table ipv6_table[] = { +extern struct ctl_table *ipv6_route_sysctl_init(struct net *net); +extern struct ctl_table *ipv6_icmp_sysctl_init(struct net *net); + +static ctl_table ipv6_table_template[] = { { .ctl_name = NET_IPV6_ROUTE, .procname = "route", .maxlen = 0, .mode = 0555, - .child = ipv6_route_table + .child = ipv6_route_table_template }, { .ctl_name = NET_IPV6_ICMP, .procname = "icmp", .maxlen = 0, .mode = 0555, - .child = ipv6_icmp_table + .child = ipv6_icmp_table_template }, { .ctl_name = NET_IPV6_BINDV6ONLY, @@ -89,22 +92,66 @@ struct ctl_path net_ipv6_ctl_path[] = { }; EXPORT_SYMBOL_GPL(net_ipv6_ctl_path); -static struct ctl_table_header *ipv6_sysctl_header; - static int ipv6_sysctl_net_init(struct net *net) { - ipv6_sysctl_header = register_net_sysctl_table(net, net_ipv6_ctl_path, - ipv6_table); - if (!ipv6_sysctl_header) + struct ctl_table *ipv6_table; + struct ctl_table *ipv6_route_table; + struct ctl_table *ipv6_icmp_table; + int err; + + err = -ENOMEM; + ipv6_table = kmemdup(ipv6_table_template, sizeof(ipv6_table_template), + GFP_KERNEL); + if (!ipv6_table) + goto out; + + ipv6_route_table = ipv6_route_sysctl_init(net); + if (!ipv6_route_table) + goto out_ipv6_table; + + ipv6_icmp_table = ipv6_icmp_sysctl_init(net); + if (!ipv6_icmp_table) + goto out_ipv6_route_table; + + ipv6_table[0].child = ipv6_route_table; + ipv6_table[1].child = ipv6_icmp_table; + + net->ipv6.sysctl.table = register_net_sysctl_table(net, net_ipv6_ctl_path, + ipv6_table); + if (!net->ipv6.sysctl.table) return -ENOMEM; - return 0; + if (!net->ipv6.sysctl.table) + goto out_ipv6_icmp_table; + + err = 0; +out: + return err; +out_ipv6_icmp_table: + kfree(ipv6_icmp_table); +out_ipv6_route_table: + kfree(ipv6_route_table); +out_ipv6_table: + kfree(ipv6_table); + goto out; } static void ipv6_sysctl_net_exit(struct net *net) { - unregister_net_sysctl_table(ipv6_sysctl_header); + struct ctl_table *ipv6_table; + struct ctl_table *ipv6_route_table; + struct ctl_table *ipv6_icmp_table; + + ipv6_table = net->ipv6.sysctl.table->ctl_table_arg; + ipv6_route_table = ipv6_table[0].child; + ipv6_icmp_table = ipv6_table[1].child; + + unregister_net_sysctl_table(net->ipv6.sysctl.table); + + kfree(ipv6_table); + kfree(ipv6_route_table); + kfree(ipv6_icmp_table); } static struct pernet_operations ipv6_sysctl_net_ops = { -- 2.39.5