netfilter: nf_tables: complete net namespace support

Register family per netnamespace to ensure that sets are
only visible in its approapriate namespace.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h
index bcc4a8e..da68c9a 100644 (file)
--- a/include/net/net_namespace.h
+++ b/include/net/net_namespace.h
@@ -22,6 +22,7 @@
 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
 #include <net/netns/conntrack.h>
 #endif
+#include <net/netns/nftables.h>
 #include <net/netns/xfrm.h>
 
 struct user_namespace;
@@ -101,6 +102,9 @@ struct net {
 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
        struct netns_ct         ct;
 #endif
+#if defined(CONFIG_NF_TABLES) || defined(CONFIG_NF_TABLES_MODULE)
+       struct netns_nftables   nft;
+#endif
 #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6)
        struct netns_nf_frag    nf_frag;
 #endif

diff --git a/include/net/netfilter/nf_tables.h b/include/net/netfilter/nf_tables.h
index a68f45f..d3272e9 100644 (file)
--- a/include/net/netfilter/nf_tables.h
+++ b/include/net/netfilter/nf_tables.h
@@ -68,6 +68,7 @@ static inline void nft_data_debug(const struct nft_data *data)
 /**
  *     struct nft_ctx - nf_tables rule/set context
  *
+ *     @net: net namespace
  *     @skb: netlink skb
  *     @nlh: netlink message header
  *     @afi: address family info
@@ -76,6 +77,7 @@ static inline void nft_data_debug(const struct nft_data *data)
  *     @nla: netlink attributes
  */
 struct nft_ctx {
+       struct net                      *net;
        const struct sk_buff            *skb;
        const struct nlmsghdr           *nlh;
        const struct nft_af_info        *afi;
@@ -462,7 +464,7 @@ struct nft_af_info {
        nf_hookfn                       *hooks[NF_MAX_HOOKS];
 };
 
-extern int nft_register_afinfo(struct nft_af_info *);
+extern int nft_register_afinfo(struct net *, struct nft_af_info *);
 extern void nft_unregister_afinfo(struct nft_af_info *);
 
 struct nf_chain_type {

diff --git a/include/net/netns/nftables.h b/include/net/netns/nftables.h
new file mode 100644 (file)
index 0000000..a98b1c5
--- /dev/null
+++ b/include/net/netns/nftables.h
@@ -0,0 +1,15 @@
+#ifndef _NETNS_NFTABLES_H_
+#define _NETNS_NFTABLES_H_
+
+#include <linux/list.h>
+
+struct nft_af_info;
+
+struct netns_nftables {
+       struct list_head        af_info;
+       struct nft_af_info      *ipv4;
+       struct nft_af_info      *ipv6;
+       struct nft_af_info      *bridge;
+};
+
+#endif

diff --git a/net/bridge/netfilter/nf_tables_bridge.c b/net/bridge/netfilter/nf_tables_bridge.c
index bc5c21c..e8cb016 100644 (file)
--- a/net/bridge/netfilter/nf_tables_bridge.c
+++ b/net/bridge/netfilter/nf_tables_bridge.c
@@ -19,14 +19,42 @@ static struct nft_af_info nft_af_bridge __read_mostly = {
        .owner          = THIS_MODULE,
 };
 
+static int nf_tables_bridge_init_net(struct net *net)
+{
+       net->nft.bridge = kmalloc(sizeof(struct nft_af_info), GFP_KERNEL);
+       if (net->nft.bridge == NULL)
+               return -ENOMEM;
+
+       memcpy(net->nft.bridge, &nft_af_bridge, sizeof(nft_af_bridge));
+
+       if (nft_register_afinfo(net, net->nft.bridge) < 0)
+               goto err;
+
+       return 0;
+err:
+       kfree(net->nft.bridge);
+       return -ENOMEM;
+}
+
+static void nf_tables_bridge_exit_net(struct net *net)
+{
+       nft_unregister_afinfo(net->nft.bridge);
+       kfree(net->nft.bridge);
+}
+
+static struct pernet_operations nf_tables_bridge_net_ops = {
+       .init   = nf_tables_bridge_init_net,
+       .exit   = nf_tables_bridge_exit_net,
+};
+
 static int __init nf_tables_bridge_init(void)
 {
-       return nft_register_afinfo(&nft_af_bridge);
+       return register_pernet_subsys(&nf_tables_bridge_net_ops);
 }
 
 static void __exit nf_tables_bridge_exit(void)
 {
-       nft_unregister_afinfo(&nft_af_bridge);
+       return unregister_pernet_subsys(&nf_tables_bridge_net_ops);
 }
 
 module_init(nf_tables_bridge_init);

diff --git a/net/ipv4/netfilter/nf_tables_ipv4.c b/net/ipv4/netfilter/nf_tables_ipv4.c
index c61cffb..8f7536b 100644 (file)
--- a/net/ipv4/netfilter/nf_tables_ipv4.c
+++ b/net/ipv4/netfilter/nf_tables_ipv4.c
@@ -14,6 +14,7 @@
 #include <linux/ip.h>
 #include <linux/netfilter_ipv4.h>
 #include <net/netfilter/nf_tables.h>
+#include <net/net_namespace.h>
 #include <net/ip.h>
 #include <net/net_namespace.h>
 #include <net/netfilter/nf_tables_ipv4.h>
@@ -47,6 +48,33 @@ static struct nft_af_info nft_af_ipv4 __read_mostly = {
        },
 };
 
+static int nf_tables_ipv4_init_net(struct net *net)
+{
+       net->nft.ipv4 = kmalloc(sizeof(struct nft_af_info), GFP_KERNEL);
+       if (net->nft.ipv4 == NULL)
+               return -ENOMEM;
+
+       memcpy(net->nft.ipv4, &nft_af_ipv4, sizeof(nft_af_ipv4));
+
+       if (nft_register_afinfo(net, net->nft.ipv4) < 0)
+               goto err;
+
+       return 0;
+err:
+       kfree(net->nft.ipv4);
+       return -ENOMEM;
+}
+
+static void nf_tables_ipv4_exit_net(struct net *net)
+{
+       nft_unregister_afinfo(net->nft.ipv4);
+       kfree(net->nft.ipv4);
+}
+
+static struct pernet_operations nf_tables_ipv4_net_ops = {
+       .init   = nf_tables_ipv4_init_net,
+       .exit   = nf_tables_ipv4_exit_net,
+};
 
 static unsigned int
 nft_do_chain_ipv4(const struct nf_hook_ops *ops,
@@ -83,12 +111,12 @@ static struct nf_chain_type filter_ipv4 = {
 static int __init nf_tables_ipv4_init(void)
 {
        nft_register_chain_type(&filter_ipv4);
-       return nft_register_afinfo(&nft_af_ipv4);
+       return register_pernet_subsys(&nf_tables_ipv4_net_ops);
 }
 
 static void __exit nf_tables_ipv4_exit(void)
 {
-       nft_unregister_afinfo(&nft_af_ipv4);
+       unregister_pernet_subsys(&nf_tables_ipv4_net_ops);
        nft_unregister_chain_type(&filter_ipv4);
 }
 

diff --git a/net/ipv6/netfilter/nf_tables_ipv6.c b/net/ipv6/netfilter/nf_tables_ipv6.c
index 42f905a..d77db8a 100644 (file)
--- a/net/ipv6/netfilter/nf_tables_ipv6.c
+++ b/net/ipv6/netfilter/nf_tables_ipv6.c
@@ -45,6 +45,34 @@ static struct nft_af_info nft_af_ipv6 __read_mostly = {
        },
 };
 
+static int nf_tables_ipv6_init_net(struct net *net)
+{
+       net->nft.ipv6 = kmalloc(sizeof(struct nft_af_info), GFP_KERNEL);
+       if (net->nft.ipv6 == NULL)
+               return -ENOMEM;
+
+       memcpy(net->nft.ipv6, &nft_af_ipv6, sizeof(nft_af_ipv6));
+
+       if (nft_register_afinfo(net, net->nft.ipv6) < 0)
+               goto err;
+
+       return 0;
+err:
+       kfree(net->nft.ipv6);
+       return -ENOMEM;
+}
+
+static void nf_tables_ipv6_exit_net(struct net *net)
+{
+       nft_unregister_afinfo(net->nft.ipv6);
+       kfree(net->nft.ipv6);
+}
+
+static struct pernet_operations nf_tables_ipv6_net_ops = {
+       .init   = nf_tables_ipv6_init_net,
+       .exit   = nf_tables_ipv6_exit_net,
+};
+
 static unsigned int
 nft_do_chain_ipv6(const struct nf_hook_ops *ops,
                  struct sk_buff *skb,
@@ -82,11 +110,12 @@ static struct nf_chain_type filter_ipv6 = {
 static int __init nf_tables_ipv6_init(void)
 {
        nft_register_chain_type(&filter_ipv6);
-       return nft_register_afinfo(&nft_af_ipv6);
+       return register_pernet_subsys(&nf_tables_ipv6_net_ops);
 }
+
 static void __exit nf_tables_ipv6_exit(void)
 {
-       nft_unregister_afinfo(&nft_af_ipv6);
+       unregister_pernet_subsys(&nf_tables_ipv6_net_ops);
        nft_unregister_chain_type(&filter_ipv6);
 }
 

diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index a4dd7ce..e1ee850 100644 (file)
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -18,9 +18,9 @@
 #include <linux/netfilter/nf_tables.h>
 #include <net/netfilter/nf_tables_core.h>
 #include <net/netfilter/nf_tables.h>
+#include <net/net_namespace.h>
 #include <net/sock.h>
 
-static LIST_HEAD(nf_tables_afinfo);
 static LIST_HEAD(nf_tables_expressions);
 
 /**
@@ -31,11 +31,11 @@ static LIST_HEAD(nf_tables_expressions);
  *     Register the address family for use with nf_tables. Returns zero on
  *     success or a negative errno code otherwise.
  */
-int nft_register_afinfo(struct nft_af_info *afi)
+int nft_register_afinfo(struct net *net, struct nft_af_info *afi)
 {
        INIT_LIST_HEAD(&afi->tables);
        nfnl_lock(NFNL_SUBSYS_NFTABLES);
-       list_add_tail(&afi->list, &nf_tables_afinfo);
+       list_add_tail(&afi->list, &net->nft.af_info);
        nfnl_unlock(NFNL_SUBSYS_NFTABLES);
        return 0;
 }
@@ -56,22 +56,23 @@ void nft_unregister_afinfo(struct nft_af_info *afi)
 }
 EXPORT_SYMBOL_GPL(nft_unregister_afinfo);
 
-static struct nft_af_info *nft_afinfo_lookup(int family)
+static struct nft_af_info *nft_afinfo_lookup(struct net *net, int family)
 {
        struct nft_af_info *afi;
 
-       list_for_each_entry(afi, &nf_tables_afinfo, list) {
+       list_for_each_entry(afi, &net->nft.af_info, list) {
                if (afi->family == family)
                        return afi;
        }
        return NULL;
 }
 
-static struct nft_af_info *nf_tables_afinfo_lookup(int family, bool autoload)
+static struct nft_af_info *
+nf_tables_afinfo_lookup(struct net *net, int family, bool autoload)
 {
        struct nft_af_info *afi;
 
-       afi = nft_afinfo_lookup(family);
+       afi = nft_afinfo_lookup(net, family);
        if (afi != NULL)
                return afi;
 #ifdef CONFIG_MODULES
@@ -79,7 +80,7 @@ static struct nft_af_info *nf_tables_afinfo_lookup(int family, bool autoload)
                nfnl_unlock(NFNL_SUBSYS_NFTABLES);
                request_module("nft-afinfo-%u", family);
                nfnl_lock(NFNL_SUBSYS_NFTABLES);
-               afi = nft_afinfo_lookup(family);
+               afi = nft_afinfo_lookup(net, family);
                if (afi != NULL)
                        return ERR_PTR(-EAGAIN);
        }
@@ -232,9 +233,10 @@ static int nf_tables_dump_tables(struct sk_buff *skb,
        const struct nft_af_info *afi;
        const struct nft_table *table;
        unsigned int idx = 0, s_idx = cb->args[0];
+       struct net *net = sock_net(skb->sk);
        int family = nfmsg->nfgen_family;
 
-       list_for_each_entry(afi, &nf_tables_afinfo, list) {
+       list_for_each_entry(afi, &net->nft.af_info, list) {
                if (family != NFPROTO_UNSPEC && family != afi->family)
                        continue;
 
@@ -268,6 +270,7 @@ static int nf_tables_gettable(struct sock *nlsk, struct sk_buff *skb,
        const struct nft_af_info *afi;
        const struct nft_table *table;
        struct sk_buff *skb2;
+       struct net *net = sock_net(skb->sk);
        int family = nfmsg->nfgen_family;
        int err;
 
@@ -278,7 +281,7 @@ static int nf_tables_gettable(struct sock *nlsk, struct sk_buff *skb,
                return netlink_dump_start(nlsk, skb, nlh, &c);
        }
 
-       afi = nf_tables_afinfo_lookup(family, false);
+       afi = nf_tables_afinfo_lookup(net, family, false);
        if (IS_ERR(afi))
                return PTR_ERR(afi);
 
@@ -379,9 +382,10 @@ static int nf_tables_newtable(struct sock *nlsk, struct sk_buff *skb,
        const struct nlattr *name;
        struct nft_af_info *afi;
        struct nft_table *table;
+       struct net *net = sock_net(skb->sk);
        int family = nfmsg->nfgen_family;
 
-       afi = nf_tables_afinfo_lookup(family, true);
+       afi = nf_tables_afinfo_lookup(net, family, true);
        if (IS_ERR(afi))
                return PTR_ERR(afi);
 
@@ -433,9 +437,10 @@ static int nf_tables_deltable(struct sock *nlsk, struct sk_buff *skb,
        const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
        struct nft_af_info *afi;
        struct nft_table *table;
+       struct net *net = sock_net(skb->sk);
        int family = nfmsg->nfgen_family;
 
-       afi = nf_tables_afinfo_lookup(family, false);
+       afi = nf_tables_afinfo_lookup(net, family, false);
        if (IS_ERR(afi))
                return PTR_ERR(afi);
 
@@ -663,9 +668,10 @@ static int nf_tables_dump_chains(struct sk_buff *skb,
        const struct nft_table *table;
        const struct nft_chain *chain;
        unsigned int idx = 0, s_idx = cb->args[0];
+       struct net *net = sock_net(skb->sk);
        int family = nfmsg->nfgen_family;
 
-       list_for_each_entry(afi, &nf_tables_afinfo, list) {
+       list_for_each_entry(afi, &net->nft.af_info, list) {
                if (family != NFPROTO_UNSPEC && family != afi->family)
                        continue;
 
@@ -702,6 +708,7 @@ static int nf_tables_getchain(struct sock *nlsk, struct sk_buff *skb,
        const struct nft_table *table;
        const struct nft_chain *chain;
        struct sk_buff *skb2;
+       struct net *net = sock_net(skb->sk);
        int family = nfmsg->nfgen_family;
        int err;
 
@@ -712,7 +719,7 @@ static int nf_tables_getchain(struct sock *nlsk, struct sk_buff *skb,
                return netlink_dump_start(nlsk, skb, nlh, &c);
        }
 
-       afi = nf_tables_afinfo_lookup(family, false);
+       afi = nf_tables_afinfo_lookup(net, family, false);
        if (IS_ERR(afi))
                return PTR_ERR(afi);
 
@@ -813,6 +820,7 @@ static int nf_tables_newchain(struct sock *nlsk, struct sk_buff *skb,
        struct nft_chain *chain;
        struct nft_base_chain *basechain = NULL;
        struct nlattr *ha[NFTA_HOOK_MAX + 1];
+       struct net *net = sock_net(skb->sk);
        int family = nfmsg->nfgen_family;
        u64 handle = 0;
        int err;
@@ -820,7 +828,7 @@ static int nf_tables_newchain(struct sock *nlsk, struct sk_buff *skb,
 
        create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
 
-       afi = nf_tables_afinfo_lookup(family, true);
+       afi = nf_tables_afinfo_lookup(net, family, true);
        if (IS_ERR(afi))
                return PTR_ERR(afi);
 
@@ -1010,9 +1018,10 @@ static int nf_tables_delchain(struct sock *nlsk, struct sk_buff *skb,
        const struct nft_af_info *afi;
        struct nft_table *table;
        struct nft_chain *chain;
+       struct net *net = sock_net(skb->sk);
        int family = nfmsg->nfgen_family;
 
-       afi = nf_tables_afinfo_lookup(family, false);
+       afi = nf_tables_afinfo_lookup(net, family, false);
        if (IS_ERR(afi))
                return PTR_ERR(afi);
 
@@ -1050,6 +1059,7 @@ static void nft_ctx_init(struct nft_ctx *ctx,
                         const struct nft_chain *chain,
                         const struct nlattr * const *nla)
 {
+       ctx->net   = sock_net(skb->sk);
        ctx->skb   = skb;
        ctx->nlh   = nlh;
        ctx->afi   = afi;
@@ -1361,9 +1371,10 @@ static int nf_tables_dump_rules(struct sk_buff *skb,
        const struct nft_chain *chain;
        const struct nft_rule *rule;
        unsigned int idx = 0, s_idx = cb->args[0];
+       struct net *net = sock_net(skb->sk);
        int family = nfmsg->nfgen_family;
 
-       list_for_each_entry(afi, &nf_tables_afinfo, list) {
+       list_for_each_entry(afi, &net->nft.af_info, list) {
                if (family != NFPROTO_UNSPEC && family != afi->family)
                        continue;
 
@@ -1402,6 +1413,7 @@ static int nf_tables_getrule(struct sock *nlsk, struct sk_buff *skb,
        const struct nft_chain *chain;
        const struct nft_rule *rule;
        struct sk_buff *skb2;
+       struct net *net = sock_net(skb->sk);
        int family = nfmsg->nfgen_family;
        int err;
 
@@ -1412,7 +1424,7 @@ static int nf_tables_getrule(struct sock *nlsk, struct sk_buff *skb,
                return netlink_dump_start(nlsk, skb, nlh, &c);
        }
 
-       afi = nf_tables_afinfo_lookup(family, false);
+       afi = nf_tables_afinfo_lookup(net, family, false);
        if (IS_ERR(afi))
                return PTR_ERR(afi);
 
@@ -1477,6 +1489,7 @@ static int nf_tables_newrule(struct sock *nlsk, struct sk_buff *skb,
 {
        const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
        const struct nft_af_info *afi;
+       struct net *net = sock_net(skb->sk);
        struct nft_table *table;
        struct nft_chain *chain;
        struct nft_rule *rule, *old_rule = NULL;
@@ -1490,7 +1503,7 @@ static int nf_tables_newrule(struct sock *nlsk, struct sk_buff *skb,
 
        create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
 
-       afi = nf_tables_afinfo_lookup(nfmsg->nfgen_family, create);
+       afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
        if (IS_ERR(afi))
                return PTR_ERR(afi);
 
@@ -1585,12 +1598,13 @@ static int nf_tables_delrule(struct sock *nlsk, struct sk_buff *skb,
 {
        const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
        const struct nft_af_info *afi;
+       struct net *net = sock_net(skb->sk);
        const struct nft_table *table;
        struct nft_chain *chain;
        struct nft_rule *rule, *tmp;
        int family = nfmsg->nfgen_family;
 
-       afi = nf_tables_afinfo_lookup(family, false);
+       afi = nf_tables_afinfo_lookup(net, family, false);
        if (IS_ERR(afi))
                return PTR_ERR(afi);
 
@@ -1697,11 +1711,12 @@ static int nft_ctx_init_from_setattr(struct nft_ctx *ctx,
                                     const struct nlmsghdr *nlh,
                                     const struct nlattr * const nla[])
 {
+       struct net *net = sock_net(skb->sk);
        const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
        const struct nft_af_info *afi;
        const struct nft_table *table = NULL;
 
-       afi = nf_tables_afinfo_lookup(nfmsg->nfgen_family, false);
+       afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
        if (IS_ERR(afi))
                return PTR_ERR(afi);
 
@@ -1818,12 +1833,11 @@ static int nf_tables_set_notify(const struct nft_ctx *ctx,
 {
        struct sk_buff *skb;
        u32 portid = NETLINK_CB(ctx->skb).portid;
-       struct net *net = sock_net(ctx->skb->sk);
        bool report;
        int err;
 
        report = nlmsg_report(ctx->nlh);
-       if (!report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
+       if (!report && !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
                return 0;
 
        err = -ENOBUFS;
@@ -1837,11 +1851,11 @@ static int nf_tables_set_notify(const struct nft_ctx *ctx,
                goto err;
        }
 
-       err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report,
+       err = nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES, report,
                             GFP_KERNEL);
 err:
        if (err < 0)
-               nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err);
+               nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, err);
        return err;
 }
 
@@ -1974,6 +1988,7 @@ static int nf_tables_newset(struct sock *nlsk, struct sk_buff *skb,
        const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
        const struct nft_set_ops *ops;
        const struct nft_af_info *afi;
+       struct net *net = sock_net(skb->sk);
        struct nft_table *table;
        struct nft_set *set;
        struct nft_ctx ctx;
@@ -2032,7 +2047,7 @@ static int nf_tables_newset(struct sock *nlsk, struct sk_buff *skb,
 
        create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
 
-       afi = nf_tables_afinfo_lookup(nfmsg->nfgen_family, create);
+       afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
        if (IS_ERR(afi))
                return PTR_ERR(afi);
 
@@ -2219,8 +2234,9 @@ static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx,
        const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
        const struct nft_af_info *afi;
        const struct nft_table *table;
+       struct net *net = sock_net(skb->sk);
 
-       afi = nf_tables_afinfo_lookup(nfmsg->nfgen_family, false);
+       afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
        if (IS_ERR(afi))
                return PTR_ERR(afi);
 
@@ -3011,6 +3027,16 @@ int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
 }
 EXPORT_SYMBOL_GPL(nft_data_dump);
 
+static int nf_tables_init_net(struct net *net)
+{
+       INIT_LIST_HEAD(&net->nft.af_info);
+       return 0;
+}
+
+static struct pernet_operations nf_tables_net_ops = {
+       .init   = nf_tables_init_net,
+};
+
 static int __init nf_tables_module_init(void)
 {
        int err;
@@ -3031,7 +3057,7 @@ static int __init nf_tables_module_init(void)
                goto err3;
 
        pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n");
-       return 0;
+       return register_pernet_subsys(&nf_tables_net_ops);
 err3:
        nf_tables_core_module_exit();
 err2:
@@ -3042,6 +3068,7 @@ err1:
 
 static void __exit nf_tables_module_exit(void)
 {
+       unregister_pernet_subsys(&nf_tables_net_ops);
        nfnetlink_subsys_unregister(&nf_tables_subsys);
        nf_tables_core_module_exit();
        kfree(info);