Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 | /*
* 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);
/* 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);
/* Called when a conntrack entry is destroyed */
void (*destroy)(struct nf_conn *ct);
int (*error)(struct net *net, 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 *);
/* 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;
#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);
/* 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*/
|