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authorJorge Boncompte <jorge@dti2.net>2007-05-03 03:34:42 -0700
committerDavid S. Miller <davem@davemloft.net>2007-05-03 03:34:42 -0700
commitc2a1910b06fed96db77bb358c18c52a1fcf2b7fe (patch)
treea3e8fc944ea2a0bed4a6e02b6b0fb42e21444354 /net/ipv4/netfilter
parent327850070b019a96853c533c152688546201c286 (diff)
[NETFILTER]: nf_nat_proto_gre: do not modify/corrupt GREv0 packets through NAT
While porting some changes of the 2.6.21-rc7 pptp/proto_gre conntrack and nat modules to a 2.4.32 kernel I noticed that the gre_key function returns a wrong pointer to the GRE key of a version 0 packet thus corrupting the packet payload. The intended behaviour for GREv0 packets is to act like nf_conntrack_proto_generic/nf_nat_proto_unknown so I have ripped the offending functions (not used anymore) and modified the nf_nat_proto_gre modules to not touch version 0 (non PPTP) packets. Signed-off-by: Jorge Boncompte <jorge@dti2.net> Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/netfilter')
-rw-r--r--net/ipv4/netfilter/nf_nat_proto_gre.c20
1 files changed, 8 insertions, 12 deletions
diff --git a/net/ipv4/netfilter/nf_nat_proto_gre.c b/net/ipv4/netfilter/nf_nat_proto_gre.c
index e5a34c17d92..c3908bc5a70 100644
--- a/net/ipv4/netfilter/nf_nat_proto_gre.c
+++ b/net/ipv4/netfilter/nf_nat_proto_gre.c
@@ -72,6 +72,11 @@ gre_unique_tuple(struct nf_conntrack_tuple *tuple,
__be16 *keyptr;
unsigned int min, i, range_size;
+ /* If there is no master conntrack we are not PPTP,
+ do not change tuples */
+ if (!conntrack->master)
+ return 0;
+
if (maniptype == IP_NAT_MANIP_SRC)
keyptr = &tuple->src.u.gre.key;
else
@@ -122,18 +127,9 @@ gre_manip_pkt(struct sk_buff **pskb, unsigned int iphdroff,
if (maniptype != IP_NAT_MANIP_DST)
return 1;
switch (greh->version) {
- case 0:
- if (!greh->key) {
- DEBUGP("can't nat GRE w/o key\n");
- break;
- }
- if (greh->csum) {
- /* FIXME: Never tested this code... */
- nf_proto_csum_replace4(gre_csum(greh), *pskb,
- *(gre_key(greh)),
- tuple->dst.u.gre.key, 0);
- }
- *(gre_key(greh)) = tuple->dst.u.gre.key;
+ case GRE_VERSION_1701:
+ /* We do not currently NAT any GREv0 packets.
+ * Try to behave like "nf_nat_proto_unknown" */
break;
case GRE_VERSION_PPTP:
DEBUGP("call_id -> 0x%04x\n", ntohs(tuple->dst.u.gre.key));