include/linux/netfilter/nf_conntrack_h323.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _NF_CONNTRACK_H323_H
   3 #define _NF_CONNTRACK_H323_H
   4
   5 #include <linux/netfilter.h>
   6 #include <linux/skbuff.h>
   7 #include <linux/types.h>
   8 #include <linux/netfilter/nf_conntrack_h323_asn1.h>
   9 #include <net/netfilter/nf_conntrack_expect.h>
  10 #include <uapi/linux/netfilter/nf_conntrack_tuple_common.h>
  11
  12 #define RAS_PORT 1719
  13 #define Q931_PORT 1720
  14 #define H323_RTP_CHANNEL_MAX 4  /* Audio, video, FAX and other */
  15
  16 /* This structure exists only once per master */
  17 struct nf_ct_h323_master {
  18
  19         /* Original and NATed Q.931 or H.245 signal ports */
  20         __be16 sig_port[IP_CT_DIR_MAX];
  21
  22         /* Original and NATed RTP ports */
  23         __be16 rtp_port[H323_RTP_CHANNEL_MAX][IP_CT_DIR_MAX];
  24
  25         union {
  26                 /* RAS connection timeout */
  27                 u_int32_t timeout;
  28
  29                 /* Next TPKT length (for separate TPKT header and data) */
  30                 u_int16_t tpkt_len[IP_CT_DIR_MAX];
  31         };
  32 };
  33
  34 int get_h225_addr(struct nf_conn *ct, unsigned char *data,
  35                   TransportAddress *taddr, union nf_inet_addr *addr,
  36                   __be16 *port);
  37
  38 struct nfct_h323_nat_hooks {
  39         int (*set_h245_addr)(struct sk_buff *skb, unsigned int protoff,
  40                              unsigned char **data, int dataoff,
  41                              H245_TransportAddress *taddr,
  42                              union nf_inet_addr *addr, __be16 port);
  43         int (*set_h225_addr)(struct sk_buff *skb, unsigned int protoff,
  44                              unsigned char **data, int dataoff,
  45                              TransportAddress *taddr,
  46                              union nf_inet_addr *addr, __be16 port);
  47         int (*set_sig_addr)(struct sk_buff *skb,
  48                             struct nf_conn *ct,
  49                             enum ip_conntrack_info ctinfo,
  50                             unsigned int protoff, unsigned char **data,
  51                             TransportAddress *taddr, int count);
  52         int (*set_ras_addr)(struct sk_buff *skb,
  53                             struct nf_conn *ct,
  54                             enum ip_conntrack_info ctinfo,
  55                             unsigned int protoff, unsigned char **data,
  56                             TransportAddress *taddr, int count);
  57         int (*nat_rtp_rtcp)(struct sk_buff *skb,
  58                             struct nf_conn *ct,
  59                             enum ip_conntrack_info ctinfo,
  60                             unsigned int protoff,
  61                             unsigned char **data, int dataoff,
  62                             H245_TransportAddress *taddr,
  63                             __be16 port, __be16 rtp_port,
  64                             struct nf_conntrack_expect *rtp_exp,
  65                             struct nf_conntrack_expect *rtcp_exp);
  66         int (*nat_t120)(struct sk_buff *skb,
  67                         struct nf_conn *ct,
  68                         enum ip_conntrack_info ctinfo,
  69                         unsigned int protoff,
  70                         unsigned char **data, int dataoff,
  71                         H245_TransportAddress *taddr, __be16 port,
  72                         struct nf_conntrack_expect *exp);
  73         int (*nat_h245)(struct sk_buff *skb,
  74                         struct nf_conn *ct,
  75                         enum ip_conntrack_info ctinfo,
  76                         unsigned int protoff,
  77                         unsigned char **data, int dataoff,
  78                         TransportAddress *taddr, __be16 port,
  79                         struct nf_conntrack_expect *exp);
  80         int (*nat_callforwarding)(struct sk_buff *skb,
  81                                   struct nf_conn *ct,
  82                                   enum ip_conntrack_info ctinfo,
  83                                   unsigned int protoff,
  84                                   unsigned char **data, int dataoff,
  85                                   TransportAddress *taddr, __be16 port,
  86                                   struct nf_conntrack_expect *exp);
  87         int (*nat_q931)(struct sk_buff *skb,
  88                         struct nf_conn *ct,
  89                         enum ip_conntrack_info ctinfo,
  90                         unsigned int protoff,
  91                         unsigned char **data, TransportAddress *taddr, int idx,
  92                         __be16 port, struct nf_conntrack_expect *exp);
  93 };
  94 extern const struct nfct_h323_nat_hooks __rcu *nfct_h323_nat_hook;
  95
  96 #endif