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[NETFILTER]: ip6_tables: per-netns IPv6 FILTER, MANGLE, RAW
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Now it's possible to list and manipulate per-netns ip6tables rules.
Filtering decisions are based on init_net's table so far.

P.S.: remove init_net check in inet6_create() to see the effect

Signed-off-by: Alexey Dobriyan <adobriyan@sw.ru>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Alexey Dobriyan authored and David S. Miller committed Feb 1, 2008
1 parent 336b517 commit 8280aa6
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Showing 4 changed files with 91 additions and 32 deletions.
5 changes: 5 additions & 0 deletions include/net/netns/ipv6.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -31,5 +31,10 @@ struct netns_ipv6 {
struct ipv6_devconf *devconf_all;
struct ipv6_devconf *devconf_dflt;
struct netns_frags frags;
#ifdef CONFIG_NETFILTER
struct xt_table *ip6table_filter;
struct xt_table *ip6table_mangle;
struct xt_table *ip6table_raw;
#endif
};
#endif
40 changes: 29 additions & 11 deletions net/ipv6/netfilter/ip6table_filter.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -26,7 +26,7 @@ static struct
struct ip6t_replace repl;
struct ip6t_standard entries[3];
struct ip6t_error term;
} initial_table __initdata = {
} initial_table __net_initdata = {
.repl = {
.name = "filter",
.valid_hooks = FILTER_VALID_HOOKS,
Expand All @@ -51,14 +51,13 @@ static struct
.term = IP6T_ERROR_INIT, /* ERROR */
};

static struct xt_table __packet_filter = {
static struct xt_table packet_filter = {
.name = "filter",
.valid_hooks = FILTER_VALID_HOOKS,
.lock = RW_LOCK_UNLOCKED,
.me = THIS_MODULE,
.af = AF_INET6,
};
static struct xt_table *packet_filter;

/* The work comes in here from netfilter.c. */
static unsigned int
Expand All @@ -68,7 +67,7 @@ ip6t_hook(unsigned int hook,
const struct net_device *out,
int (*okfn)(struct sk_buff *))
{
return ip6t_do_table(skb, hook, in, out, packet_filter);
return ip6t_do_table(skb, hook, in, out, init_net.ipv6.ip6table_filter);
}

static unsigned int
Expand All @@ -88,7 +87,7 @@ ip6t_local_out_hook(unsigned int hook,
}
#endif

return ip6t_do_table(skb, hook, in, out, packet_filter);
return ip6t_do_table(skb, hook, in, out, init_net.ipv6.ip6table_filter);
}

static struct nf_hook_ops ip6t_ops[] __read_mostly = {
Expand Down Expand Up @@ -119,6 +118,26 @@ static struct nf_hook_ops ip6t_ops[] __read_mostly = {
static int forward = NF_ACCEPT;
module_param(forward, bool, 0000);

static int __net_init ip6table_filter_net_init(struct net *net)
{
/* Register table */
net->ipv6.ip6table_filter =
ip6t_register_table(net, &packet_filter, &initial_table.repl);
if (IS_ERR(net->ipv6.ip6table_filter))
return PTR_ERR(net->ipv6.ip6table_filter);
return 0;
}

static void __net_exit ip6table_filter_net_exit(struct net *net)
{
ip6t_unregister_table(net->ipv6.ip6table_filter);
}

static struct pernet_operations ip6table_filter_net_ops = {
.init = ip6table_filter_net_init,
.exit = ip6table_filter_net_exit,
};

static int __init ip6table_filter_init(void)
{
int ret;
Expand All @@ -131,10 +150,9 @@ static int __init ip6table_filter_init(void)
/* Entry 1 is the FORWARD hook */
initial_table.entries[1].target.verdict = -forward - 1;

/* Register table */
packet_filter = ip6t_register_table(&init_net, &__packet_filter, &initial_table.repl);
if (IS_ERR(packet_filter))
return PTR_ERR(packet_filter);
ret = register_pernet_subsys(&ip6table_filter_net_ops);
if (ret < 0)
return ret;

/* Register hooks */
ret = nf_register_hooks(ip6t_ops, ARRAY_SIZE(ip6t_ops));
Expand All @@ -144,14 +162,14 @@ static int __init ip6table_filter_init(void)
return ret;

cleanup_table:
ip6t_unregister_table(packet_filter);
unregister_pernet_subsys(&ip6table_filter_net_ops);
return ret;
}

static void __exit ip6table_filter_fini(void)
{
nf_unregister_hooks(ip6t_ops, ARRAY_SIZE(ip6t_ops));
ip6t_unregister_table(packet_filter);
unregister_pernet_subsys(&ip6table_filter_net_ops);
}

module_init(ip6table_filter_init);
Expand Down
40 changes: 29 additions & 11 deletions net/ipv6/netfilter/ip6table_mangle.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -26,7 +26,7 @@ static struct
struct ip6t_replace repl;
struct ip6t_standard entries[5];
struct ip6t_error term;
} initial_table __initdata = {
} initial_table __net_initdata = {
.repl = {
.name = "mangle",
.valid_hooks = MANGLE_VALID_HOOKS,
Expand Down Expand Up @@ -57,14 +57,13 @@ static struct
.term = IP6T_ERROR_INIT, /* ERROR */
};

static struct xt_table __packet_mangler = {
static struct xt_table packet_mangler = {
.name = "mangle",
.valid_hooks = MANGLE_VALID_HOOKS,
.lock = RW_LOCK_UNLOCKED,
.me = THIS_MODULE,
.af = AF_INET6,
};
static struct xt_table *packet_mangler;

/* The work comes in here from netfilter.c. */
static unsigned int
Expand All @@ -74,7 +73,7 @@ ip6t_route_hook(unsigned int hook,
const struct net_device *out,
int (*okfn)(struct sk_buff *))
{
return ip6t_do_table(skb, hook, in, out, packet_mangler);
return ip6t_do_table(skb, hook, in, out, init_net.ipv6.ip6table_mangle);
}

static unsigned int
Expand Down Expand Up @@ -109,7 +108,7 @@ ip6t_local_hook(unsigned int hook,
/* flowlabel and prio (includes version, which shouldn't change either */
flowlabel = *((u_int32_t *)ipv6_hdr(skb));

ret = ip6t_do_table(skb, hook, in, out, packet_mangler);
ret = ip6t_do_table(skb, hook, in, out, init_net.ipv6.ip6table_mangle);

if (ret != NF_DROP && ret != NF_STOLEN
&& (memcmp(&ipv6_hdr(skb)->saddr, &saddr, sizeof(saddr))
Expand Down Expand Up @@ -159,14 +158,33 @@ static struct nf_hook_ops ip6t_ops[] __read_mostly = {
},
};

static int __net_init ip6table_mangle_net_init(struct net *net)
{
/* Register table */
net->ipv6.ip6table_mangle =
ip6t_register_table(net, &packet_mangler, &initial_table.repl);
if (IS_ERR(net->ipv6.ip6table_mangle))
return PTR_ERR(net->ipv6.ip6table_mangle);
return 0;
}

static void __net_exit ip6table_mangle_net_exit(struct net *net)
{
ip6t_unregister_table(net->ipv6.ip6table_mangle);
}

static struct pernet_operations ip6table_mangle_net_ops = {
.init = ip6table_mangle_net_init,
.exit = ip6table_mangle_net_exit,
};

static int __init ip6table_mangle_init(void)
{
int ret;

/* Register table */
packet_mangler = ip6t_register_table(&init_net, &__packet_mangler, &initial_table.repl);
if (IS_ERR(packet_mangler))
return PTR_ERR(packet_mangler);
ret = register_pernet_subsys(&ip6table_mangle_net_ops);
if (ret < 0)
return ret;

/* Register hooks */
ret = nf_register_hooks(ip6t_ops, ARRAY_SIZE(ip6t_ops));
Expand All @@ -176,14 +194,14 @@ static int __init ip6table_mangle_init(void)
return ret;

cleanup_table:
ip6t_unregister_table(packet_mangler);
unregister_pernet_subsys(&ip6table_mangle_net_ops);
return ret;
}

static void __exit ip6table_mangle_fini(void)
{
nf_unregister_hooks(ip6t_ops, ARRAY_SIZE(ip6t_ops));
ip6t_unregister_table(packet_mangler);
unregister_pernet_subsys(&ip6table_mangle_net_ops);
}

module_init(ip6table_mangle_init);
Expand Down
38 changes: 28 additions & 10 deletions net/ipv6/netfilter/ip6table_raw.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -13,7 +13,7 @@ static struct
struct ip6t_replace repl;
struct ip6t_standard entries[2];
struct ip6t_error term;
} initial_table __initdata = {
} initial_table __net_initdata = {
.repl = {
.name = "raw",
.valid_hooks = RAW_VALID_HOOKS,
Expand All @@ -35,14 +35,13 @@ static struct
.term = IP6T_ERROR_INIT, /* ERROR */
};

static struct xt_table __packet_raw = {
static struct xt_table packet_raw = {
.name = "raw",
.valid_hooks = RAW_VALID_HOOKS,
.lock = RW_LOCK_UNLOCKED,
.me = THIS_MODULE,
.af = AF_INET6,
};
static struct xt_table *packet_raw;

/* The work comes in here from netfilter.c. */
static unsigned int
Expand All @@ -52,7 +51,7 @@ ip6t_hook(unsigned int hook,
const struct net_device *out,
int (*okfn)(struct sk_buff *))
{
return ip6t_do_table(skb, hook, in, out, packet_raw);
return ip6t_do_table(skb, hook, in, out, init_net.ipv6.ip6table_raw);
}

static struct nf_hook_ops ip6t_ops[] __read_mostly = {
Expand All @@ -72,14 +71,33 @@ static struct nf_hook_ops ip6t_ops[] __read_mostly = {
},
};

static int __net_init ip6table_raw_net_init(struct net *net)
{
/* Register table */
net->ipv6.ip6table_raw =
ip6t_register_table(net, &packet_raw, &initial_table.repl);
if (IS_ERR(net->ipv6.ip6table_raw))
return PTR_ERR(net->ipv6.ip6table_raw);
return 0;
}

static void __net_exit ip6table_raw_net_exit(struct net *net)
{
ip6t_unregister_table(net->ipv6.ip6table_raw);
}

static struct pernet_operations ip6table_raw_net_ops = {
.init = ip6table_raw_net_init,
.exit = ip6table_raw_net_exit,
};

static int __init ip6table_raw_init(void)
{
int ret;

/* Register table */
packet_raw = ip6t_register_table(&init_net, &__packet_raw, &initial_table.repl);
if (IS_ERR(packet_raw))
return PTR_ERR(packet_raw);
ret = register_pernet_subsys(&ip6table_raw_net_ops);
if (ret < 0)
return ret;

/* Register hooks */
ret = nf_register_hooks(ip6t_ops, ARRAY_SIZE(ip6t_ops));
Expand All @@ -89,14 +107,14 @@ static int __init ip6table_raw_init(void)
return ret;

cleanup_table:
ip6t_unregister_table(packet_raw);
unregister_pernet_subsys(&ip6table_raw_net_ops);
return ret;
}

static void __exit ip6table_raw_fini(void)
{
nf_unregister_hooks(ip6t_ops, ARRAY_SIZE(ip6t_ops));
ip6t_unregister_table(packet_raw);
unregister_pernet_subsys(&ip6table_raw_net_ops);
}

module_init(ip6table_raw_init);
Expand Down

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