This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / include / net / netfilter / nf_conntrack_l4proto.h

diff --git a/include/net/netfilter/nf_conntrack_l4proto.h b/include/net/netfilter/nf_conntrack_l4proto.h
new file mode 100644 (file)
index 0000000..fc8af08
--- /dev/null
+++ b/include/net/netfilter/nf_conntrack_l4proto.h
@@ -0,0 +1,136 @@
+/*
+ * Header for use in defining a given L4 protocol for connection tracking.
+ *
+ * 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
+ *     - generalized L3 protocol dependent part.
+ *
+ * Derived from include/linux/netfiter_ipv4/ip_conntrack_protcol.h
+ */
+
+#ifndef _NF_CONNTRACK_L4PROTO_H
+#define _NF_CONNTRACK_L4PROTO_H
+#include <net/netfilter/nf_conntrack.h>
+
+struct seq_file;
+struct nfattr;
+
+struct nf_conntrack_l4proto
+{
+       /* L3 Protocol number. */
+       u_int16_t l3proto;
+
+       /* L4 Protocol number. */
+       u_int8_t l4proto;
+
+       /* Protocol name */
+       const char *name;
+
+       /* Try to fill in the third arg: dataoff is offset past network protocol
+           hdr.  Return true if possible. */
+       int (*pkt_to_tuple)(const struct sk_buff *skb,
+                           unsigned int dataoff,
+                           struct nf_conntrack_tuple *tuple);
+
+       /* Invert the per-proto part of the tuple: ie. turn xmit into reply.
+        * Some packets can't be inverted: return 0 in that case.
+        */
+       int (*invert_tuple)(struct nf_conntrack_tuple *inverse,
+                           const struct nf_conntrack_tuple *orig);
+
+       /* Print out the per-protocol part of the tuple. Return like seq_* */
+       int (*print_tuple)(struct seq_file *s,
+                          const struct nf_conntrack_tuple *);
+
+       /* Print out the private part of the conntrack. */
+       int (*print_conntrack)(struct seq_file *s, const struct nf_conn *);
+
+       /* Returns verdict for packet, or -1 for invalid. */
+       int (*packet)(struct nf_conn *conntrack,
+                     const struct sk_buff *skb,
+                     unsigned int dataoff,
+                     enum ip_conntrack_info ctinfo,
+                     int pf,
+                     unsigned int hooknum);
+
+       /* Called when a new connection for this protocol found;
+        * returns TRUE if it's OK.  If so, packet() called next. */
+       int (*new)(struct nf_conn *conntrack, const struct sk_buff *skb,
+                  unsigned int dataoff);
+
+       /* Called when a conntrack entry is destroyed */
+       void (*destroy)(struct nf_conn *conntrack);
+
+       int (*error)(struct sk_buff *skb, unsigned int dataoff,
+                    enum ip_conntrack_info *ctinfo,
+                    int pf, unsigned int hooknum);
+
+       /* convert protoinfo to nfnetink attributes */
+       int (*to_nfattr)(struct sk_buff *skb, struct nfattr *nfa,
+                        const struct nf_conn *ct);
+
+       /* convert nfnetlink attributes to protoinfo */
+       int (*from_nfattr)(struct nfattr *tb[], struct nf_conn *ct);
+
+       int (*tuple_to_nfattr)(struct sk_buff *skb,
+                              const struct nf_conntrack_tuple *t);
+       int (*nfattr_to_tuple)(struct nfattr *tb[],
+                              struct nf_conntrack_tuple *t);
+
+#ifdef CONFIG_SYSCTL
+       struct ctl_table_header **ctl_table_header;
+       struct ctl_table        *ctl_table;
+       unsigned int            *ctl_table_users;
+#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
+       struct ctl_table_header *ctl_compat_table_header;
+       struct ctl_table        *ctl_compat_table;
+#endif
+#endif
+
+       /* Module (if any) which this is connected to. */
+       struct module *me;
+};
+
+/* Existing built-in protocols */
+extern struct nf_conntrack_l4proto nf_conntrack_l4proto_tcp6;
+extern struct nf_conntrack_l4proto nf_conntrack_l4proto_udp4;
+extern struct nf_conntrack_l4proto nf_conntrack_l4proto_udp6;
+extern struct nf_conntrack_l4proto nf_conntrack_l4proto_generic;
+
+#define MAX_NF_CT_PROTO 256
+extern struct nf_conntrack_l4proto **nf_ct_protos[PF_MAX];
+
+extern struct nf_conntrack_l4proto *
+__nf_ct_l4proto_find(u_int16_t l3proto, u_int8_t l4proto);
+
+extern struct nf_conntrack_l4proto *
+nf_ct_l4proto_find_get(u_int16_t l3proto, u_int8_t protocol);
+
+extern void nf_ct_l4proto_put(struct nf_conntrack_l4proto *p);
+
+/* Protocol registration. */
+extern int nf_conntrack_l4proto_register(struct nf_conntrack_l4proto *proto);
+extern int nf_conntrack_l4proto_unregister(struct nf_conntrack_l4proto *proto);
+
+/* Generic netlink helpers */
+extern int nf_ct_port_tuple_to_nfattr(struct sk_buff *skb,
+                                     const struct nf_conntrack_tuple *tuple);
+extern int nf_ct_port_nfattr_to_tuple(struct nfattr *tb[],
+                                     struct nf_conntrack_tuple *t);
+
+/* Log invalid packets */
+extern unsigned int nf_ct_log_invalid;
+
+#ifdef CONFIG_SYSCTL
+#ifdef DEBUG_INVALID_PACKETS
+#define LOG_INVALID(proto) \
+       (nf_ct_log_invalid == (proto) || nf_ct_log_invalid == IPPROTO_RAW)
+#else
+#define LOG_INVALID(proto) \
+       ((nf_ct_log_invalid == (proto) || nf_ct_log_invalid == IPPROTO_RAW) \
+        && net_ratelimit())
+#endif
+#else
+#define LOG_INVALID(proto) 0
+#endif /* CONFIG_SYSCTL */
+
+#endif /*_NF_CONNTRACK_PROTOCOL_H*/