--- /dev/null
+/*
+ * 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 <linux/netlink.h>
+#include <net/netlink.h>
+#include <net/netfilter/nf_conntrack.h>
+#include <net/netns/generic.h>
+
+struct seq_file;
+
+struct nf_conntrack_l4proto {
+ /* L3 Protocol number. */
+ u_int16_t l3proto;
+
+ /* L4 Protocol number. */
+ u_int8_t l4proto;
+
+ /* Try to fill in the third arg: dataoff is offset past network protocol
+ hdr. Return true if possible. */
+ bool (*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.
+ */
+ bool (*invert_tuple)(struct nf_conntrack_tuple *inverse,
+ const struct nf_conntrack_tuple *orig);
+
+ /* Returns verdict for packet, or -1 for invalid. */
+ int (*packet)(struct nf_conn *ct,
+ const struct sk_buff *skb,
+ unsigned int dataoff,
+ enum ip_conntrack_info ctinfo,
+ u_int8_t pf,
+ unsigned int hooknum,
+ unsigned int *timeouts);
+
+ /* Called when a new connection for this protocol found;
+ * returns TRUE if it's OK. If so, packet() called next. */
+ bool (*new)(struct nf_conn *ct, const struct sk_buff *skb,
+ unsigned int dataoff, unsigned int *timeouts);
+
+ /* Called when a conntrack entry is destroyed */
+ void (*destroy)(struct nf_conn *ct);
+
+ int (*error)(struct net *net, struct nf_conn *tmpl, struct sk_buff *skb,
+ unsigned int dataoff, enum ip_conntrack_info *ctinfo,
+ u_int8_t pf, unsigned int hooknum);
+
+ /* Print out the per-protocol part of the tuple. Return like seq_* */
+ void (*print_tuple)(struct seq_file *s,
+ const struct nf_conntrack_tuple *);
+
+ /* Print out the private part of the conntrack. */
+ void (*print_conntrack)(struct seq_file *s, struct nf_conn *);
+
+ /* Return the array of timeouts for this protocol. */
+ unsigned int *(*get_timeouts)(struct net *net);
+
+ /* convert protoinfo to nfnetink attributes */
+ int (*to_nlattr)(struct sk_buff *skb, struct nlattr *nla,
+ struct nf_conn *ct);
+ /* Calculate protoinfo nlattr size */
+ int (*nlattr_size)(void);
+
+ /* convert nfnetlink attributes to protoinfo */
+ int (*from_nlattr)(struct nlattr *tb[], struct nf_conn *ct);
+
+ int (*tuple_to_nlattr)(struct sk_buff *skb,
+ const struct nf_conntrack_tuple *t);
+ /* Calculate tuple nlattr size */
+ int (*nlattr_tuple_size)(void);
+ int (*nlattr_to_tuple)(struct nlattr *tb[],
+ struct nf_conntrack_tuple *t);
+ const struct nla_policy *nla_policy;
+
+ size_t nla_size;
+
+#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
+ struct {
+ size_t obj_size;
+ int (*nlattr_to_obj)(struct nlattr *tb[],
+ struct net *net, void *data);
+ int (*obj_to_nlattr)(struct sk_buff *skb, const void *data);
+
+ unsigned int nlattr_max;
+ const struct nla_policy *nla_policy;
+ } ctnl_timeout;
+#endif
+ int *net_id;
+ /* Init l4proto pernet data */
+ int (*init_net)(struct net *net, u_int16_t proto);
+
+ /* Return the per-net protocol part. */
+ struct nf_proto_net *(*get_net_proto)(struct net *net);
+
+ /* Protocol name */
+ const char *name;
+
+ /* Module (if any) which this is connected to. */
+ struct module *me;
+};
+
+/* Existing built-in generic protocol */
+extern struct nf_conntrack_l4proto nf_conntrack_l4proto_generic;
+
+#define MAX_NF_CT_PROTO 256
+
+struct nf_conntrack_l4proto *__nf_ct_l4proto_find(u_int16_t l3proto,
+ u_int8_t l4proto);
+
+struct nf_conntrack_l4proto *nf_ct_l4proto_find_get(u_int16_t l3proto,
+ u_int8_t l4proto);
+void nf_ct_l4proto_put(struct nf_conntrack_l4proto *p);
+
+/* Protocol pernet registration. */
+int nf_ct_l4proto_pernet_register(struct net *net,
+ struct nf_conntrack_l4proto *proto);
+void nf_ct_l4proto_pernet_unregister(struct net *net,
+ struct nf_conntrack_l4proto *proto);
+
+/* Protocol global registration. */
+int nf_ct_l4proto_register(struct nf_conntrack_l4proto *proto);
+void nf_ct_l4proto_unregister(struct nf_conntrack_l4proto *proto);
+
+static inline void nf_ct_kfree_compat_sysctl_table(struct nf_proto_net *pn)
+{
+#if defined(CONFIG_SYSCTL) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT)
+ kfree(pn->ctl_compat_table);
+ pn->ctl_compat_table = NULL;
+#endif
+}
+
+/* Generic netlink helpers */
+int nf_ct_port_tuple_to_nlattr(struct sk_buff *skb,
+ const struct nf_conntrack_tuple *tuple);
+int nf_ct_port_nlattr_to_tuple(struct nlattr *tb[],
+ struct nf_conntrack_tuple *t);
+int nf_ct_port_nlattr_tuple_size(void);
+extern const struct nla_policy nf_ct_port_nla_policy[];
+
+#ifdef CONFIG_SYSCTL
+#define LOG_INVALID(net, proto) \
+ ((net)->ct.sysctl_log_invalid == (proto) || \
+ (net)->ct.sysctl_log_invalid == IPPROTO_RAW)
+#else
+static inline int LOG_INVALID(struct net *net, int proto) { return 0; }
+#endif /* CONFIG_SYSCTL */
+
+#endif /*_NF_CONNTRACK_PROTOCOL_H*/
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