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netfilter: nf_tables: complete net namespace support

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

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2013-10-10 23:28:33 +02:00
parent eb31628e37
commit 99633ab29b
7 changed files with 168 additions and 35 deletions
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4
include/net/net_namespace.h
View File

@ -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

4
include/net/netfilter/nf_tables.h
View File

@ -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 {

15
include/net/netns/nftables.h Normal file
View File

@ -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

32
net/bridge/netfilter/nf_tables_bridge.c
View File

@ -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);

32
net/ipv4/netfilter/nf_tables_ipv4.c
View File

@ -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);
}

33
net/ipv6/netfilter/nf_tables_ipv6.c
View File

@ -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);
}

83
net/netfilter/nf_tables_api.c
View File

@ -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);