| /* Modifications were made by Cisco Systems, Inc. on or before Wed Nov 30 13:28:05 PST 2011 |
| * RTSP extension for IP connection tracking. |
| * (C) 2003 by Tom Marshall <tmarshall at real.com> |
| * based on ip_conntrack_irc.h |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version |
| * 2 of the License, or (at your option) any later version. |
| */ |
| #ifndef _IP_CONNTRACK_RTSP_H |
| #define _IP_CONNTRACK_RTSP_H |
| |
| //#define IP_NF_RTSP_DEBUG 1 |
| #define IP_NF_RTSP_VERSION "0.6.21" |
| |
| #ifdef __KERNEL__ |
| /* port block types */ |
| typedef enum { |
| pb_single, /* client_port=x */ |
| pb_range, /* client_port=x-y */ |
| pb_discon /* client_port=x/y (rtspbis) */ |
| } portblock_t; |
| |
| /* We record seq number and length of rtsp headers here, all in host order. */ |
| |
| /* |
| * This structure is per expected connection. It is a member of struct |
| * ip_conntrack_expect. The TCP SEQ for the conntrack expect is stored |
| * there and we are expected to only store the length of the data which |
| * needs replaced. If a packet contains multiple RTSP messages, we create |
| * one expected connection per message. |
| * |
| * We use these variables to mark the entire header block. This may seem |
| * like overkill, but the nature of RTSP requires it. A header may appear |
| * multiple times in a message. We must treat two Transport headers the |
| * same as one Transport header with two entries. |
| */ |
| struct ip_ct_rtsp_expect |
| { |
| u_int32_t len; /* length of header block */ |
| portblock_t pbtype; /* Type of port block that was requested */ |
| u_int16_t loport; /* Port that was requested, low or first */ |
| u_int16_t hiport; /* Port that was requested, high or second */ |
| #if 0 |
| uint method; /* RTSP method */ |
| uint cseq; /* CSeq from request */ |
| #endif |
| }; |
| |
| extern unsigned int (*nf_nat_rtsp_hook)(struct sk_buff *skb, |
| enum ip_conntrack_info ctinfo, |
| unsigned int matchoff, unsigned int matchlen, |
| struct ip_ct_rtsp_expect *prtspexp, |
| struct nf_conntrack_expect *exp); |
| |
| extern void (*nf_nat_rtsp_hook_expectfn)(struct nf_conn *ct, struct nf_conntrack_expect *exp); |
| |
| #define RTSP_PORT 554 |
| |
| #endif /* __KERNEL__ */ |
| |
| #endif /* _IP_CONNTRACK_RTSP_H */ |
