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- /*
- * 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 void 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*/
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