p71924506
/
linux_old1
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf 

Pablo Neira Ayuso says:

====================
Netfilter fixes for net

The following patchset contain Netfilter fixes for your net tree, they are:

1) Fix a race in nfnetlink_log and nfnetlink_queue that can lead to a crash.
   This problem is due to wrong order in the per-net registration and netlink
   socket events. Patch from Francesco Ruggeri.

2) Make sure that counters that userspace pass us are higher than 0 in all the
   x_tables frontends. Discovered via Trinity, patch from Dave Jones.

3) Revert a patch for br_netfilter to rely on the conntrack status bits. This
   breaks stateless IPv6 NAT transformations. Patch from Florian Westphal.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2015-05-22 14:25:45 -04:00
parent 381c759d99 faecbb45eb
commit 572152adfb
8 changed files with 51 additions and 36 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
include/linux/skbuff.h
View File

@ -176,6 +176,7 @@ struct nf_bridge_info {
struct net_device *physindev;
struct net_device *physoutdev;
char neigh_header[8];
__be32 ipv4_daddr;
};
#endif

27
net/bridge/br_netfilter.c
View File

@ -37,10 +37,6 @@
#include <net/route.h>
#include <net/netfilter/br_netfilter.h>
#if IS_ENABLED(CONFIG_NF_CONNTRACK)
#include <net/netfilter/nf_conntrack.h>
#endif
#include <asm/uaccess.h>
#include "br_private.h"
#ifdef CONFIG_SYSCTL
@ -350,24 +346,15 @@ static int br_nf_pre_routing_finish_bridge(struct sock *sk, struct sk_buff *skb)
return 0;
}
static bool dnat_took_place(const struct sk_buff *skb)
static bool daddr_was_changed(const struct sk_buff *skb,
const struct nf_bridge_info *nf_bridge)
{
#if IS_ENABLED(CONFIG_NF_CONNTRACK)
enum ip_conntrack_info ctinfo;
struct nf_conn *ct;
ct = nf_ct_get(skb, &ctinfo);
if (!ct || nf_ct_is_untracked(ct))
return false;
return test_bit(IPS_DST_NAT_BIT, &ct->status);
#else
return false;
#endif
return ip_hdr(skb)->daddr != nf_bridge->ipv4_daddr;
}
/* This requires some explaining. If DNAT has taken place,
* we will need to fix up the destination Ethernet address.
* This is also true when SNAT takes place (for the reply direction).
*
* There are two cases to consider:
* 1. The packet was DNAT'ed to a device in the same bridge
@ -421,7 +408,7 @@ static int br_nf_pre_routing_finish(struct sock *sk, struct sk_buff *skb)
nf_bridge->pkt_otherhost = false;
}
nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING;
if (dnat_took_place(skb)) {
if (daddr_was_changed(skb, nf_bridge)) {
if ((err = ip_route_input(skb, iph->daddr, iph->saddr, iph->tos, dev))) {
struct in_device *in_dev = __in_dev_get_rcu(dev);
@ -632,6 +619,7 @@ static unsigned int br_nf_pre_routing(const struct nf_hook_ops *ops,
struct sk_buff *skb,
const struct nf_hook_state *state)
{
struct nf_bridge_info *nf_bridge;
struct net_bridge_port *p;
struct net_bridge *br;
__u32 len = nf_bridge_encap_header_len(skb);
@ -669,6 +657,9 @@ static unsigned int br_nf_pre_routing(const struct nf_hook_ops *ops,
if (!setup_pre_routing(skb))
return NF_DROP;
nf_bridge = nf_bridge_info_get(skb);
nf_bridge->ipv4_daddr = ip_hdr(skb)->daddr;
skb->protocol = htons(ETH_P_IP);
NF_HOOK(NFPROTO_IPV4, NF_INET_PRE_ROUTING, state->sk, skb,

4
net/bridge/netfilter/ebtables.c
View File

@ -1117,6 +1117,8 @@ static int do_replace(struct net *net, const void __user *user,
return -ENOMEM;
if (tmp.num_counters >= INT_MAX / sizeof(struct ebt_counter))
return -ENOMEM;
if (tmp.num_counters == 0)
return -EINVAL;
tmp.name[sizeof(tmp.name) - 1] = 0;
@ -2159,6 +2161,8 @@ static int compat_copy_ebt_replace_from_user(struct ebt_replace *repl,
return -ENOMEM;
if (tmp.num_counters >= INT_MAX / sizeof(struct ebt_counter))
return -ENOMEM;
if (tmp.num_counters == 0)
return -EINVAL;
memcpy(repl, &tmp, offsetof(struct ebt_replace, hook_entry));

6
net/ipv4/netfilter/arp_tables.c
View File

@ -1075,6 +1075,9 @@ static int do_replace(struct net *net, const void __user *user,
/* overflow check */
if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters))
return -ENOMEM;
if (tmp.num_counters == 0)
return -EINVAL;
tmp.name[sizeof(tmp.name)-1] = 0;
newinfo = xt_alloc_table_info(tmp.size);
@ -1499,6 +1502,9 @@ static int compat_do_replace(struct net *net, void __user *user,
return -ENOMEM;
if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters))
return -ENOMEM;
if (tmp.num_counters == 0)
return -EINVAL;
tmp.name[sizeof(tmp.name)-1] = 0;
newinfo = xt_alloc_table_info(tmp.size);

6
net/ipv4/netfilter/ip_tables.c
View File

@ -1262,6 +1262,9 @@ do_replace(struct net *net, const void __user *user, unsigned int len)
/* overflow check */
if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters))
return -ENOMEM;
if (tmp.num_counters == 0)
return -EINVAL;
tmp.name[sizeof(tmp.name)-1] = 0;
newinfo = xt_alloc_table_info(tmp.size);
@ -1809,6 +1812,9 @@ compat_do_replace(struct net *net, void __user *user, unsigned int len)
return -ENOMEM;
if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters))
return -ENOMEM;
if (tmp.num_counters == 0)
return -EINVAL;
tmp.name[sizeof(tmp.name)-1] = 0;
newinfo = xt_alloc_table_info(tmp.size);

6
net/ipv6/netfilter/ip6_tables.c
View File

@ -1275,6 +1275,9 @@ do_replace(struct net *net, const void __user *user, unsigned int len)
/* overflow check */
if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters))
return -ENOMEM;
if (tmp.num_counters == 0)
return -EINVAL;
tmp.name[sizeof(tmp.name)-1] = 0;
newinfo = xt_alloc_table_info(tmp.size);
@ -1822,6 +1825,9 @@ compat_do_replace(struct net *net, void __user *user, unsigned int len)
return -ENOMEM;
if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters))
return -ENOMEM;
if (tmp.num_counters == 0)
return -EINVAL;
tmp.name[sizeof(tmp.name)-1] = 0;
newinfo = xt_alloc_table_info(tmp.size);

19
net/netfilter/nfnetlink_log.c
View File

@ -1073,7 +1073,13 @@ static struct pernet_operations nfnl_log_net_ops = {
static int __init nfnetlink_log_init(void)
{
int status = -ENOMEM;
int status;
status = register_pernet_subsys(&nfnl_log_net_ops);
if (status < 0) {
pr_err("failed to register pernet ops\n");
goto out;
}
netlink_register_notifier(&nfulnl_rtnl_notifier);
status = nfnetlink_subsys_register(&nfulnl_subsys);
@ -1088,28 +1094,23 @@ static int __init nfnetlink_log_init(void)
goto cleanup_subsys;
}
status = register_pernet_subsys(&nfnl_log_net_ops);
if (status < 0) {
pr_err("failed to register pernet ops\n");
goto cleanup_logger;
}
return status;
cleanup_logger:
nf_log_unregister(&nfulnl_logger);
cleanup_subsys:
nfnetlink_subsys_unregister(&nfulnl_subsys);
cleanup_netlink_notifier:
netlink_unregister_notifier(&nfulnl_rtnl_notifier);
unregister_pernet_subsys(&nfnl_log_net_ops);
out:
return status;
}
static void __exit nfnetlink_log_fini(void)
{
unregister_pernet_subsys(&nfnl_log_net_ops);
nf_log_unregister(&nfulnl_logger);
nfnetlink_subsys_unregister(&nfulnl_subsys);
netlink_unregister_notifier(&nfulnl_rtnl_notifier);
unregister_pernet_subsys(&nfnl_log_net_ops);
}
MODULE_DESCRIPTION("netfilter userspace logging");

18
net/netfilter/nfnetlink_queue_core.c
View File

@ -1317,7 +1317,13 @@ static struct pernet_operations nfnl_queue_net_ops = {
static int __init nfnetlink_queue_init(void)
{
int status = -ENOMEM;
int status;
status = register_pernet_subsys(&nfnl_queue_net_ops);
if (status < 0) {
pr_err("nf_queue: failed to register pernet ops\n");
goto out;
}
netlink_register_notifier(&nfqnl_rtnl_notifier);
status = nfnetlink_subsys_register(&nfqnl_subsys);
@ -1326,19 +1332,13 @@ static int __init nfnetlink_queue_init(void)
goto cleanup_netlink_notifier;
}
status = register_pernet_subsys(&nfnl_queue_net_ops);
if (status < 0) {
pr_err("nf_queue: failed to register pernet ops\n");
goto cleanup_subsys;
}
register_netdevice_notifier(&nfqnl_dev_notifier);
nf_register_queue_handler(&nfqh);
return status;
cleanup_subsys:
nfnetlink_subsys_unregister(&nfqnl_subsys);
cleanup_netlink_notifier:
netlink_unregister_notifier(&nfqnl_rtnl_notifier);
out:
return status;
}
@ -1346,9 +1346,9 @@ static void __exit nfnetlink_queue_fini(void)
{
nf_unregister_queue_handler();
unregister_netdevice_notifier(&nfqnl_dev_notifier);
unregister_pernet_subsys(&nfnl_queue_net_ops);
nfnetlink_subsys_unregister(&nfqnl_subsys);
netlink_unregister_notifier(&nfqnl_rtnl_notifier);
unregister_pernet_subsys(&nfnl_queue_net_ops);
rcu_barrier(); /* Wait for completion of call_rcu()'s */
}