diff options
author | Patrick McHardy <kaber@trash.net> | 2005-09-06 15:09:43 -0700 |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2005-09-06 15:09:43 -0700 |
commit | 03486a4f838c55481317fca5ac2e7d12550a4fb7 (patch) | |
tree | 9c5e5cd835102d67198e5fd1c6756f3b0de65a2c /net/ipv4/netfilter/ip_nat_rule.c | |
parent | 31c913e7fd48000163a88cfe10383fd3be20910e (diff) |
[NETFILTER]: Handle NAT module load race
When the NAT module is loaded when connections are already confirmed
it must not change their tuples anymore. This is especially important
with CONFIG_NETFILTER_DEBUG, the netfilter listhelp functions will
refuse to remove an entry from a list when it can not be found on
the list, so when a changed tuple hashes to a new bucket the entry
is kept in the list until and after the conntrack is freed.
Allocate the exact conntrack tuple for NAT for already confirmed
connections or drop them if that fails.
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/netfilter/ip_nat_rule.c')
-rw-r--r-- | net/ipv4/netfilter/ip_nat_rule.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/net/ipv4/netfilter/ip_nat_rule.c b/net/ipv4/netfilter/ip_nat_rule.c index 60d70fa41a1..cb66b8bddeb 100644 --- a/net/ipv4/netfilter/ip_nat_rule.c +++ b/net/ipv4/netfilter/ip_nat_rule.c @@ -255,6 +255,27 @@ alloc_null_binding(struct ip_conntrack *conntrack, return ip_nat_setup_info(conntrack, &range, hooknum); } +unsigned int +alloc_null_binding_confirmed(struct ip_conntrack *conntrack, + struct ip_nat_info *info, + unsigned int hooknum) +{ + u_int32_t ip + = (HOOK2MANIP(hooknum) == IP_NAT_MANIP_SRC + ? conntrack->tuplehash[IP_CT_DIR_REPLY].tuple.dst.ip + : conntrack->tuplehash[IP_CT_DIR_REPLY].tuple.src.ip); + u_int16_t all + = (HOOK2MANIP(hooknum) == IP_NAT_MANIP_SRC + ? conntrack->tuplehash[IP_CT_DIR_REPLY].tuple.dst.u.all + : conntrack->tuplehash[IP_CT_DIR_REPLY].tuple.src.u.all); + struct ip_nat_range range + = { IP_NAT_RANGE_MAP_IPS, ip, ip, { all }, { all } }; + + DEBUGP("Allocating NULL binding for confirmed %p (%u.%u.%u.%u)\n", + conntrack, NIPQUAD(ip)); + return ip_nat_setup_info(conntrack, &range, hooknum); +} + int ip_nat_rule_find(struct sk_buff **pskb, unsigned int hooknum, const struct net_device *in, |