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Message-ID: <20080121145509.GJ27615@localhost.sw.ru>
Date: Mon, 21 Jan 2008 17:55:09 +0300
From: Alexey Dobriyan <adobriyan@...ru>
To: kaber@...sh.net
Cc: netfilter-devel@...r.kernel.org, netdev@...r.kernel.org,
devel@...nvz.org
Subject: [PATCH 5/5] netns netfilter: per-netns FILTER, MANGLE, RAW
Now, iptables show and configure different set of rules in different
netnss'. Filtering decisions are still made by consulting only
init_net's set.
Changes are identical except naming so no splitting.
P.S.: one need to remove init_net checks in nf_sockopt.c and inet_create()
to see the effect.
Signed-off-by: Alexey Dobriyan <adobriyan@...ru>
---
include/net/netns/ipv4.h | 5 ++++
net/ipv4/netfilter/iptable_filter.c | 41 ++++++++++++++++++++++++-----------
net/ipv4/netfilter/iptable_mangle.c | 41 ++++++++++++++++++++++++-----------
net/ipv4/netfilter/iptable_raw.c | 41 ++++++++++++++++++++++++-----------
4 files changed, 92 insertions(+), 36 deletions(-)
--- a/include/net/netns/ipv4.h
+++ b/include/net/netns/ipv4.h
@@ -22,5 +22,10 @@ struct netns_ipv4 {
#endif
struct hlist_head *fib_table_hash;
struct sock *fibnl;
+#ifdef CONFIG_NETFILTER
+ struct xt_table *iptable_filter;
+ struct xt_table *iptable_mangle;
+ struct xt_table *iptable_raw;
+#endif
};
#endif
--- a/net/ipv4/netfilter/iptable_filter.c
+++ b/net/ipv4/netfilter/iptable_filter.c
@@ -28,7 +28,7 @@ static struct
struct ipt_replace repl;
struct ipt_standard entries[3];
struct ipt_error term;
-} initial_table __initdata = {
+} initial_table __net_initdata = {
.repl = {
.name = "filter",
.valid_hooks = FILTER_VALID_HOOKS,
@@ -53,14 +53,13 @@ static struct
.term = IPT_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_INET,
};
-static struct xt_table *packet_filter;
/* The work comes in here from netfilter.c. */
static unsigned int
@@ -70,7 +69,7 @@ ipt_hook(unsigned int hook,
const struct net_device *out,
int (*okfn)(struct sk_buff *))
{
- return ipt_do_table(skb, hook, in, out, packet_filter);
+ return ipt_do_table(skb, hook, in, out, init_net.ipv4.iptable_filter);
}
static unsigned int
@@ -89,7 +88,7 @@ ipt_local_out_hook(unsigned int hook,
return NF_ACCEPT;
}
- return ipt_do_table(skb, hook, in, out, packet_filter);
+ return ipt_do_table(skb, hook, in, out, init_net.ipv4.iptable_filter);
}
static struct nf_hook_ops ipt_ops[] __read_mostly = {
@@ -120,6 +119,26 @@ static struct nf_hook_ops ipt_ops[] __read_mostly = {
static int forward = NF_ACCEPT;
module_param(forward, bool, 0000);
+static int __net_init iptable_filter_net_init(struct net *net)
+{
+ /* Register table */
+ net->ipv4.iptable_filter =
+ ipt_register_table(net, &packet_filter, &initial_table.repl);
+ if (IS_ERR(net->ipv4.iptable_filter))
+ return PTR_ERR(net->ipv4.iptable_filter);
+ return 0;
+}
+
+static void __net_exit iptable_filter_net_exit(struct net *net)
+{
+ ipt_unregister_table(net->ipv4.iptable_filter);
+}
+
+static struct pernet_operations iptable_filter_net_ops = {
+ .init = iptable_filter_net_init,
+ .exit = iptable_filter_net_exit,
+};
+
static int __init iptable_filter_init(void)
{
int ret;
@@ -132,11 +151,9 @@ static int __init iptable_filter_init(void)
/* Entry 1 is the FORWARD hook */
initial_table.entries[1].target.verdict = -forward - 1;
- /* Register table */
- packet_filter = ipt_register_table(&init_net, &__packet_filter,
- &initial_table.repl);
- if (IS_ERR(packet_filter))
- return PTR_ERR(packet_filter);
+ ret = register_pernet_subsys(&iptable_filter_net_ops);
+ if (ret < 0)
+ return ret;
/* Register hooks */
ret = nf_register_hooks(ipt_ops, ARRAY_SIZE(ipt_ops));
@@ -146,14 +163,14 @@ static int __init iptable_filter_init(void)
return ret;
cleanup_table:
- ipt_unregister_table(packet_filter);
+ unregister_pernet_subsys(&iptable_filter_net_ops);
return ret;
}
static void __exit iptable_filter_fini(void)
{
nf_unregister_hooks(ipt_ops, ARRAY_SIZE(ipt_ops));
- ipt_unregister_table(packet_filter);
+ unregister_pernet_subsys(&iptable_filter_net_ops);
}
module_init(iptable_filter_init);
--- a/net/ipv4/netfilter/iptable_mangle.c
+++ b/net/ipv4/netfilter/iptable_mangle.c
@@ -33,7 +33,7 @@ static struct
struct ipt_replace repl;
struct ipt_standard entries[5];
struct ipt_error term;
-} initial_table __initdata = {
+} initial_table __net_initdata = {
.repl = {
.name = "mangle",
.valid_hooks = MANGLE_VALID_HOOKS,
@@ -64,14 +64,13 @@ static struct
.term = IPT_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_INET,
};
-static struct xt_table *packet_mangler;
/* The work comes in here from netfilter.c. */
static unsigned int
@@ -81,7 +80,7 @@ ipt_route_hook(unsigned int hook,
const struct net_device *out,
int (*okfn)(struct sk_buff *))
{
- return ipt_do_table(skb, hook, in, out, packet_mangler);
+ return ipt_do_table(skb, hook, in, out, init_net.ipv4.iptable_mangle);
}
static unsigned int
@@ -113,7 +112,7 @@ ipt_local_hook(unsigned int hook,
daddr = iph->daddr;
tos = iph->tos;
- ret = ipt_do_table(skb, hook, in, out, packet_mangler);
+ ret = ipt_do_table(skb, hook, in, out, init_net.ipv4.iptable_mangle);
/* Reroute for ANY change. */
if (ret != NF_DROP && ret != NF_STOLEN && ret != NF_QUEUE) {
iph = ip_hdr(skb);
@@ -167,15 +166,33 @@ static struct nf_hook_ops ipt_ops[] __read_mostly = {
},
};
+static int __net_init iptable_mangle_net_init(struct net *net)
+{
+ /* Register table */
+ net->ipv4.iptable_mangle =
+ ipt_register_table(net, &packet_mangler, &initial_table.repl);
+ if (IS_ERR(net->ipv4.iptable_mangle))
+ return PTR_ERR(net->ipv4.iptable_mangle);
+ return 0;
+}
+
+static void __net_exit iptable_mangle_net_exit(struct net *net)
+{
+ ipt_unregister_table(net->ipv4.iptable_mangle);
+}
+
+static struct pernet_operations iptable_mangle_net_ops = {
+ .init = iptable_mangle_net_init,
+ .exit = iptable_mangle_net_exit,
+};
+
static int __init iptable_mangle_init(void)
{
int ret;
- /* Register table */
- packet_mangler = ipt_register_table(&init_net, &__packet_mangler,
- &initial_table.repl);
- if (IS_ERR(packet_mangler))
- return PTR_ERR(packet_mangler);
+ ret = register_pernet_subsys(&iptable_mangle_net_ops);
+ if (ret < 0)
+ return ret;
/* Register hooks */
ret = nf_register_hooks(ipt_ops, ARRAY_SIZE(ipt_ops));
@@ -185,14 +202,14 @@ static int __init iptable_mangle_init(void)
return ret;
cleanup_table:
- ipt_unregister_table(packet_mangler);
+ unregister_pernet_subsys(&iptable_mangle_net_ops);
return ret;
}
static void __exit iptable_mangle_fini(void)
{
nf_unregister_hooks(ipt_ops, ARRAY_SIZE(ipt_ops));
- ipt_unregister_table(packet_mangler);
+ unregister_pernet_subsys(&iptable_mangle_net_ops);
}
module_init(iptable_mangle_init);
--- a/net/ipv4/netfilter/iptable_raw.c
+++ b/net/ipv4/netfilter/iptable_raw.c
@@ -14,7 +14,7 @@ static struct
struct ipt_replace repl;
struct ipt_standard entries[2];
struct ipt_error term;
-} initial_table __initdata = {
+} initial_table __net_initdata = {
.repl = {
.name = "raw",
.valid_hooks = RAW_VALID_HOOKS,
@@ -36,14 +36,13 @@ static struct
.term = IPT_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_INET,
};
-static struct xt_table *packet_raw;
/* The work comes in here from netfilter.c. */
static unsigned int
@@ -53,7 +52,7 @@ ipt_hook(unsigned int hook,
const struct net_device *out,
int (*okfn)(struct sk_buff *))
{
- return ipt_do_table(skb, hook, in, out, packet_raw);
+ return ipt_do_table(skb, hook, in, out, init_net.ipv4.iptable_raw);
}
static unsigned int
@@ -71,7 +70,7 @@ ipt_local_hook(unsigned int hook,
"packet.\n");
return NF_ACCEPT;
}
- return ipt_do_table(skb, hook, in, out, packet_raw);
+ return ipt_do_table(skb, hook, in, out, init_net.ipv4.iptable_raw);
}
/* 'raw' is the very first table. */
@@ -92,15 +91,33 @@ static struct nf_hook_ops ipt_ops[] __read_mostly = {
},
};
+static int __net_init iptable_raw_net_init(struct net *net)
+{
+ /* Register table */
+ net->ipv4.iptable_raw =
+ ipt_register_table(net, &packet_raw, &initial_table.repl);
+ if (IS_ERR(net->ipv4.iptable_raw))
+ return PTR_ERR(net->ipv4.iptable_raw);
+ return 0;
+}
+
+static void __net_exit iptable_raw_net_exit(struct net *net)
+{
+ ipt_unregister_table(net->ipv4.iptable_raw);
+}
+
+static struct pernet_operations iptable_raw_net_ops = {
+ .init = iptable_raw_net_init,
+ .exit = iptable_raw_net_exit,
+};
+
static int __init iptable_raw_init(void)
{
int ret;
- /* Register table */
- packet_raw = ipt_register_table(&init_net, &__packet_raw,
- &initial_table.repl);
- if (IS_ERR(packet_raw))
- return PTR_ERR(packet_raw);
+ ret = register_pernet_subsys(&iptable_raw_net_ops);
+ if (ret < 0)
+ return ret;
/* Register hooks */
ret = nf_register_hooks(ipt_ops, ARRAY_SIZE(ipt_ops));
@@ -110,14 +127,14 @@ static int __init iptable_raw_init(void)
return ret;
cleanup_table:
- ipt_unregister_table(packet_raw);
+ unregister_pernet_subsys(&iptable_raw_net_ops);
return ret;
}
static void __exit iptable_raw_fini(void)
{
nf_unregister_hooks(ipt_ops, ARRAY_SIZE(ipt_ops));
- ipt_unregister_table(packet_raw);
+ unregister_pernet_subsys(&iptable_raw_net_ops);
}
module_init(iptable_raw_init);
--
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