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[NETNS][FRAGS]: Duplicate sysctl tables for new namespaces.

Browse source 
Each namespace has to have own tables to tune their
different parameters, so duplicate the tables and
register them.

All the tables in sub-namespaces are temporarily made
read-only.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Pavel Emelyanov 2008-01-22 06:08:36 -08:00 • committed by David S. Miller
parent 6ddc082223
commit e4a2d5c2bc
4 changed files with 79 additions and 6 deletions
Download patch file Download diff file Expand all files Collapse all files

1
include/net/netns/ipv4.h
View file

@ -16,6 +16,7 @@ struct sock;
struct netns_ipv4 { struct netns_ipv4 {
#ifdef CONFIG_SYSCTL #ifdef CONFIG_SYSCTL
struct ctl_table_header *forw_hdr; struct ctl_table_header *forw_hdr;
struct ctl_table_header *frags_hdr;
#endif #endif
struct ipv4_devconf *devconf_all; struct ipv4_devconf *devconf_all;
struct ipv4_devconf *devconf_dflt; struct ipv4_devconf *devconf_dflt;

1
include/net/netns/ipv6.h
View file

@ -12,6 +12,7 @@ struct ctl_table_header;
struct netns_sysctl_ipv6 { struct netns_sysctl_ipv6 {
#ifdef CONFIG_SYSCTL #ifdef CONFIG_SYSCTL
struct ctl_table_header *table; struct ctl_table_header *table;
struct ctl_table_header *frags_hdr;
#endif #endif
struct inet_frags_ctl frags; struct inet_frags_ctl frags;
int bindv6only; int bindv6only;

42
net/ipv4/ip_fragment.c
View file

@ -661,17 +661,53 @@ static struct ctl_table ip4_frags_ctl_table[] = {
static int ip4_frags_ctl_register(struct net *net) static int ip4_frags_ctl_register(struct net *net)
{ {
struct ctl_table *table;
struct ctl_table_header *hdr; struct ctl_table_header *hdr;
hdr = register_net_sysctl_table(net, net_ipv4_ctl_path, table = ip4_frags_ctl_table;
ip4_frags_ctl_table); if (net != &init_net) {
return hdr == NULL ? -ENOMEM : 0; table = kmemdup(table, sizeof(ip4_frags_ctl_table), GFP_KERNEL);
if (table == NULL)
goto err_alloc;
table[0].mode &= ~0222;
table[1].mode &= ~0222;
table[2].mode &= ~0222;
table[3].mode &= ~0222;
table[4].mode &= ~0222;
}
hdr = register_net_sysctl_table(net, net_ipv4_ctl_path, table);
if (hdr == NULL)
goto err_reg;
net->ipv4.frags_hdr = hdr;
return 0;
err_reg:
if (net != &init_net)
kfree(table);
err_alloc:
return -ENOMEM;
}
static void ip4_frags_ctl_unregister(struct net *net)
{
struct ctl_table *table;
table = net->ipv4.frags_hdr->ctl_table_arg;
unregister_net_sysctl_table(net->ipv4.frags_hdr);
kfree(table);
} }
#else #else
static inline int ip4_frags_ctl_register(struct net *net) static inline int ip4_frags_ctl_register(struct net *net)
{ {
return 0; return 0;
} }
static inline void ip4_frags_ctl_unregister(struct net *net)
{
}
#endif #endif
static int ipv4_frags_init_net(struct net *net) static int ipv4_frags_init_net(struct net *net)

41
net/ipv6/reassembly.c
View file

@ -670,17 +670,52 @@ static struct ctl_table ip6_frags_ctl_table[] = {
static int ip6_frags_sysctl_register(struct net *net) static int ip6_frags_sysctl_register(struct net *net)
{ {
struct ctl_table *table;
struct ctl_table_header *hdr; struct ctl_table_header *hdr;
hdr = register_net_sysctl_table(net, net_ipv6_ctl_path, table = ip6_frags_ctl_table;
ip6_frags_ctl_table); if (net != &init_net) {
return hdr == NULL ? -ENOMEM : 0; table = kmemdup(table, sizeof(ip6_frags_ctl_table), GFP_KERNEL);
if (table == NULL)
goto err_alloc;
table[0].mode &= ~0222;
table[1].mode &= ~0222;
table[2].mode &= ~0222;
table[3].mode &= ~0222;
}
hdr = register_net_sysctl_table(net, net_ipv6_ctl_path, table);
if (hdr == NULL)
goto err_reg;
net->ipv6.sysctl.frags_hdr = hdr;
return 0;
err_reg:
if (net != &init_net)
kfree(table);
err_alloc:
return -ENOMEM;
}
static void ip6_frags_sysctl_unregister(struct net *net)
{
struct ctl_table *table;
table = net->ipv6.sysctl.frags_hdr->ctl_table_arg;
unregister_net_sysctl_table(net->ipv6.sysctl.frags_hdr);
kfree(table);
} }
#else #else
static inline int ip6_frags_sysctl_register(struct net *net) static inline int ip6_frags_sysctl_register(struct net *net)
{ {
return 0; return 0;
} }
static inline void ip6_frags_sysctl_unregister(struct net *net)
{
}
#endif #endif
static int ipv6_frags_init_net(struct net *net) static int ipv6_frags_init_net(struct net *net)