diff options
| -rw-r--r-- | net/ipv4/netfilter/ip_nat_helper_pptp.c | 8 |
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), |