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Linux/include/net/netfilter/nf_conntrack_l4proto.h

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  1 /*
  2  * Header for use in defining a given L4 protocol for connection tracking.
  3  *
  4  * 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
  5  *      - generalized L3 protocol dependent part.
  6  *
  7  * Derived from include/linux/netfiter_ipv4/ip_conntrack_protcol.h
  8  */
  9 
 10 #ifndef _NF_CONNTRACK_L4PROTO_H
 11 #define _NF_CONNTRACK_L4PROTO_H
 12 #include <linux/netlink.h>
 13 #include <net/netlink.h>
 14 #include <net/netfilter/nf_conntrack.h>
 15 
 16 struct seq_file;
 17 
 18 struct nf_conntrack_l4proto
 19 {
 20         /* L3 Protocol number. */
 21         u_int16_t l3proto;
 22 
 23         /* L4 Protocol number. */
 24         u_int8_t l4proto;
 25 
 26         /* Try to fill in the third arg: dataoff is offset past network protocol
 27            hdr.  Return true if possible. */
 28         bool (*pkt_to_tuple)(const struct sk_buff *skb, unsigned int dataoff,
 29                              struct nf_conntrack_tuple *tuple);
 30 
 31         /* Invert the per-proto part of the tuple: ie. turn xmit into reply.
 32          * Some packets can't be inverted: return 0 in that case.
 33          */
 34         bool (*invert_tuple)(struct nf_conntrack_tuple *inverse,
 35                              const struct nf_conntrack_tuple *orig);
 36 
 37         /* Returns verdict for packet, or -1 for invalid. */
 38         int (*packet)(struct nf_conn *ct,
 39                       const struct sk_buff *skb,
 40                       unsigned int dataoff,
 41                       enum ip_conntrack_info ctinfo,
 42                       u_int8_t pf,
 43                       unsigned int hooknum);
 44 
 45         /* Called when a new connection for this protocol found;
 46          * returns TRUE if it's OK.  If so, packet() called next. */
 47         bool (*new)(struct nf_conn *ct, const struct sk_buff *skb,
 48                     unsigned int dataoff);
 49 
 50         /* Called when a conntrack entry is destroyed */
 51         void (*destroy)(struct nf_conn *ct);
 52 
 53         int (*error)(struct net *net, struct sk_buff *skb, unsigned int dataoff,
 54                      enum ip_conntrack_info *ctinfo,
 55                      u_int8_t pf, unsigned int hooknum);
 56 
 57         /* Print out the per-protocol part of the tuple. Return like seq_* */
 58         int (*print_tuple)(struct seq_file *s,
 59                            const struct nf_conntrack_tuple *);
 60 
 61         /* Print out the private part of the conntrack. */
 62         int (*print_conntrack)(struct seq_file *s, struct nf_conn *);
 63 
 64         /* convert protoinfo to nfnetink attributes */
 65         int (*to_nlattr)(struct sk_buff *skb, struct nlattr *nla,
 66                          struct nf_conn *ct);
 67         /* Calculate protoinfo nlattr size */
 68         int (*nlattr_size)(void);
 69 
 70         /* convert nfnetlink attributes to protoinfo */
 71         int (*from_nlattr)(struct nlattr *tb[], struct nf_conn *ct);
 72 
 73         int (*tuple_to_nlattr)(struct sk_buff *skb,
 74                                const struct nf_conntrack_tuple *t);
 75         /* Calculate tuple nlattr size */
 76         int (*nlattr_tuple_size)(void);
 77         int (*nlattr_to_tuple)(struct nlattr *tb[],
 78                                struct nf_conntrack_tuple *t);
 79         const struct nla_policy *nla_policy;
 80 
 81         size_t nla_size;
 82 
 83 #ifdef CONFIG_SYSCTL
 84         struct ctl_table_header **ctl_table_header;
 85         struct ctl_table        *ctl_table;
 86         unsigned int            *ctl_table_users;
 87 #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
 88         struct ctl_table_header *ctl_compat_table_header;
 89         struct ctl_table        *ctl_compat_table;
 90 #endif
 91 #endif
 92         /* Protocol name */
 93         const char *name;
 94 
 95         /* Module (if any) which this is connected to. */
 96         struct module *me;
 97 };
 98 
 99 /* Existing built-in generic protocol */
100 extern struct nf_conntrack_l4proto nf_conntrack_l4proto_generic;
101 
102 #define MAX_NF_CT_PROTO 256
103 
104 extern struct nf_conntrack_l4proto *
105 __nf_ct_l4proto_find(u_int16_t l3proto, u_int8_t l4proto);
106 
107 /* Protocol registration. */
108 extern int nf_conntrack_l4proto_register(struct nf_conntrack_l4proto *proto);
109 extern void nf_conntrack_l4proto_unregister(struct nf_conntrack_l4proto *proto);
110 
111 /* Generic netlink helpers */
112 extern int nf_ct_port_tuple_to_nlattr(struct sk_buff *skb,
113                                       const struct nf_conntrack_tuple *tuple);
114 extern int nf_ct_port_nlattr_to_tuple(struct nlattr *tb[],
115                                       struct nf_conntrack_tuple *t);
116 extern int nf_ct_port_nlattr_tuple_size(void);
117 extern const struct nla_policy nf_ct_port_nla_policy[];
118 
119 #ifdef CONFIG_SYSCTL
120 #ifdef DEBUG_INVALID_PACKETS
121 #define LOG_INVALID(net, proto)                         \
122         ((net)->ct.sysctl_log_invalid == (proto) ||     \
123          (net)->ct.sysctl_log_invalid == IPPROTO_RAW)
124 #else
125 #define LOG_INVALID(net, proto)                         \
126         (((net)->ct.sysctl_log_invalid == (proto) ||    \
127           (net)->ct.sysctl_log_invalid == IPPROTO_RAW)  \
128          && net_ratelimit())
129 #endif
130 #else
131 static inline int LOG_INVALID(struct net *net, int proto) { return 0; }
132 #endif /* CONFIG_SYSCTL */
133 
134 #endif /*_NF_CONNTRACK_PROTOCOL_H*/
135 

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