aboutsummaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
authorHolger Eitzenberger <heitzenberger@astaro.com>2006-03-20 17:58:21 -0800
committerDavid S. Miller <davem@davemloft.net>2006-03-20 17:58:21 -0800
commitf2ad52c9da2229d7f038d02139d21478b33b76b4 (patch)
tree8faeeb5dbd332e9bae28d12d6e54945d587db0fa
parent[DCCP] CCID2: Drop sock reference count on timer expiration and reset. (diff)
downloadlinux-dev-f2ad52c9da2229d7f038d02139d21478b33b76b4.tar.xz
linux-dev-f2ad52c9da2229d7f038d02139d21478b33b76b4.zip
[NETFILTER]: Fix CID offset bug in PPTP NAT helper debug message
The recent (kernel 2.6.15.1) fix for PPTP NAT helper introduced a bug - which only appears if DEBUGP is enabled though. The calculation of the CID offset into a PPTP request struct is not correct, so that at least not the correct CID is displayed if DEBUGP is enabled. This patch corrects CID offset calculation and introduces a #define for that. Signed-off-by: Holger Eitzenberger <heitzenberger@astaro.com> Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/ipv4/netfilter/ip_nat_helper_pptp.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/net/ipv4/netfilter/ip_nat_helper_pptp.c b/net/ipv4/netfilter/ip_nat_helper_pptp.c
index ac004895781a..b9c016c063b8 100644
--- a/net/ipv4/netfilter/ip_nat_helper_pptp.c
+++ b/net/ipv4/netfilter/ip_nat_helper_pptp.c
@@ -52,6 +52,8 @@
#define IP_NAT_PPTP_VERSION "3.0"
+#define REQ_CID(req, off) (*(u_int16_t *)((char *)(req) + (off)))
+
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Harald Welte <laforge@gnumonks.org>");
MODULE_DESCRIPTION("Netfilter NAT helper module for PPTP");
@@ -198,7 +200,7 @@ pptp_outbound_pkt(struct sk_buff **pskb,
/* only OUT_CALL_REQUEST, IN_CALL_REPLY, CALL_CLEAR_REQUEST pass
* down to here */
DEBUGP("altering call id from 0x%04x to 0x%04x\n",
- ntohs(*(u_int16_t *)pptpReq + cid_off), ntohs(new_callid));
+ ntohs(REQ_CID(pptpReq, cid_off)), ntohs(new_callid));
/* mangle packet */
if (ip_nat_mangle_tcp_packet(pskb, ct, ctinfo,
@@ -342,7 +344,7 @@ pptp_inbound_pkt(struct sk_buff **pskb,
/* mangle packet */
DEBUGP("altering peer call id from 0x%04x to 0x%04x\n",
- ntohs(*(u_int16_t *)pptpReq + pcid_off), ntohs(new_pcid));
+ ntohs(REQ_CID(pptpReq, pcid_off)), ntohs(new_pcid));
if (ip_nat_mangle_tcp_packet(pskb, ct, ctinfo,
pcid_off + sizeof(struct pptp_pkt_hdr) +
@@ -353,7 +355,7 @@ pptp_inbound_pkt(struct sk_buff **pskb,
if (new_cid) {
DEBUGP("altering call id from 0x%04x to 0x%04x\n",
- ntohs(*(u_int16_t *)pptpReq + cid_off), ntohs(new_cid));
+ ntohs(REQ_CID(pptpReq, cid_off)), ntohs(new_cid));
if (ip_nat_mangle_tcp_packet(pskb, ct, ctinfo,
cid_off + sizeof(struct pptp_pkt_hdr) +
sizeof(struct PptpControlHeader),