134 lines
4.2 KiB
C
134 lines
4.2 KiB
C
/*
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* Header for use in defining a given L4 protocol for connection tracking.
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*
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* 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
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* - generalized L3 protocol dependent part.
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*
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* Derived from include/linux/netfiter_ipv4/ip_conntrack_protcol.h
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*/
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#ifndef _NF_CONNTRACK_L4PROTO_H
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#define _NF_CONNTRACK_L4PROTO_H
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#include <linux/netlink.h>
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#include <net/netlink.h>
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#include <net/netfilter/nf_conntrack.h>
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struct seq_file;
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struct nf_conntrack_l4proto {
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/* L3 Protocol number. */
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u_int16_t l3proto;
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/* L4 Protocol number. */
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u_int8_t l4proto;
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/* Try to fill in the third arg: dataoff is offset past network protocol
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hdr. Return true if possible. */
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bool (*pkt_to_tuple)(const struct sk_buff *skb, unsigned int dataoff,
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struct nf_conntrack_tuple *tuple);
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/* Invert the per-proto part of the tuple: ie. turn xmit into reply.
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* Some packets can't be inverted: return 0 in that case.
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*/
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bool (*invert_tuple)(struct nf_conntrack_tuple *inverse,
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const struct nf_conntrack_tuple *orig);
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/* Returns verdict for packet, or -1 for invalid. */
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int (*packet)(struct nf_conn *ct,
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const struct sk_buff *skb,
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unsigned int dataoff,
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enum ip_conntrack_info ctinfo,
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u_int8_t pf,
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unsigned int hooknum);
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/* Called when a new connection for this protocol found;
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* returns TRUE if it's OK. If so, packet() called next. */
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bool (*new)(struct nf_conn *ct, const struct sk_buff *skb,
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unsigned int dataoff);
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/* Called when a conntrack entry is destroyed */
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void (*destroy)(struct nf_conn *ct);
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int (*error)(struct net *net, struct sk_buff *skb, unsigned int dataoff,
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enum ip_conntrack_info *ctinfo,
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u_int8_t pf, unsigned int hooknum);
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/* Print out the per-protocol part of the tuple. Return like seq_* */
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int (*print_tuple)(struct seq_file *s,
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const struct nf_conntrack_tuple *);
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/* Print out the private part of the conntrack. */
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int (*print_conntrack)(struct seq_file *s, struct nf_conn *);
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/* convert protoinfo to nfnetink attributes */
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int (*to_nlattr)(struct sk_buff *skb, struct nlattr *nla,
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struct nf_conn *ct);
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/* Calculate protoinfo nlattr size */
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int (*nlattr_size)(void);
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/* convert nfnetlink attributes to protoinfo */
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int (*from_nlattr)(struct nlattr *tb[], struct nf_conn *ct);
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int (*tuple_to_nlattr)(struct sk_buff *skb,
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const struct nf_conntrack_tuple *t);
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/* Calculate tuple nlattr size */
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int (*nlattr_tuple_size)(void);
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int (*nlattr_to_tuple)(struct nlattr *tb[],
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struct nf_conntrack_tuple *t);
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const struct nla_policy *nla_policy;
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size_t nla_size;
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#ifdef CONFIG_SYSCTL
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struct ctl_table_header **ctl_table_header;
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struct ctl_table *ctl_table;
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unsigned int *ctl_table_users;
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#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
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struct ctl_table_header *ctl_compat_table_header;
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struct ctl_table *ctl_compat_table;
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#endif
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#endif
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/* Protocol name */
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const char *name;
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/* Module (if any) which this is connected to. */
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struct module *me;
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};
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/* Existing built-in generic protocol */
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extern struct nf_conntrack_l4proto nf_conntrack_l4proto_generic;
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#define MAX_NF_CT_PROTO 256
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extern struct nf_conntrack_l4proto *
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__nf_ct_l4proto_find(u_int16_t l3proto, u_int8_t l4proto);
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/* Protocol registration. */
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extern int nf_conntrack_l4proto_register(struct nf_conntrack_l4proto *proto);
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extern void nf_conntrack_l4proto_unregister(struct nf_conntrack_l4proto *proto);
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/* Generic netlink helpers */
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extern int nf_ct_port_tuple_to_nlattr(struct sk_buff *skb,
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const struct nf_conntrack_tuple *tuple);
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extern int nf_ct_port_nlattr_to_tuple(struct nlattr *tb[],
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struct nf_conntrack_tuple *t);
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extern int nf_ct_port_nlattr_tuple_size(void);
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extern const struct nla_policy nf_ct_port_nla_policy[];
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#ifdef CONFIG_SYSCTL
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#ifdef DEBUG_INVALID_PACKETS
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#define LOG_INVALID(net, proto) \
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((net)->ct.sysctl_log_invalid == (proto) || \
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(net)->ct.sysctl_log_invalid == IPPROTO_RAW)
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#else
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#define LOG_INVALID(net, proto) \
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(((net)->ct.sysctl_log_invalid == (proto) || \
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(net)->ct.sysctl_log_invalid == IPPROTO_RAW) \
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&& net_ratelimit())
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#endif
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#else
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static inline int LOG_INVALID(struct net *net, int proto) { return 0; }
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#endif /* CONFIG_SYSCTL */
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#endif /*_NF_CONNTRACK_PROTOCOL_H*/
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