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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 <linux/netlink.h>
#include <net/netlink.h>
#include <net/netfilter/nf_conntrack.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_* */
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, 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[], 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
#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
/* 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
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 l4proto);
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_nlattr(struct sk_buff *skb,
const struct nf_conntrack_tuple *tuple);
extern int nf_ct_port_nlattr_to_tuple(struct nlattr *tb[],
struct nf_conntrack_tuple *t);
extern int nf_ct_port_nlattr_tuple_size(void);
extern const struct nla_policy nf_ct_port_nla_policy[];
#ifdef CONFIG_SYSCTL
#ifdef DEBUG_INVALID_PACKETS
#define LOG_INVALID(net, proto) \
((net)->ct.sysctl_log_invalid == (proto) || \
(net)->ct.sysctl_log_invalid == IPPROTO_RAW)
#else
#define LOG_INVALID(net, proto) \
(((net)->ct.sysctl_log_invalid == (proto) || \
(net)->ct.sysctl_log_invalid == IPPROTO_RAW) \
&& net_ratelimit())
#endif
#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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