root/include/net/flow.h

INCLUDED FROM

DEFINITIONS

1. flow_cache_uli_match

/*
 *
 *      Generic internet FLOW.
 *
 */

#ifndef _NET_FLOW_H
#define _NET_FLOW_H

#include <linux/in6.h>
#include <asm/atomic.h>

struct flowi {
        int     oif;
        int     iif;
        __u32   mark;

        union {
                struct {
                        __be32                  daddr;
                        __be32                  saddr;
                        __u8                    tos;
                        __u8                    scope;
                } ip4_u;
                
                struct {
                        struct in6_addr         daddr;
                        struct in6_addr         saddr;
                        __be32                  flowlabel;
                } ip6_u;

                struct {
                        __le16                  daddr;
                        __le16                  saddr;
                        __u8                    scope;
                } dn_u;
        } nl_u;
#define fld_dst         nl_u.dn_u.daddr
#define fld_src         nl_u.dn_u.saddr
#define fld_scope       nl_u.dn_u.scope
#define fl6_dst         nl_u.ip6_u.daddr
#define fl6_src         nl_u.ip6_u.saddr
#define fl6_flowlabel   nl_u.ip6_u.flowlabel
#define fl4_dst         nl_u.ip4_u.daddr
#define fl4_src         nl_u.ip4_u.saddr
#define fl4_tos         nl_u.ip4_u.tos
#define fl4_scope       nl_u.ip4_u.scope

        __u8    proto;
        __u8    flags;
#define FLOWI_FLAG_ANYSRC 0x01
        union {
                struct {
                        __be16  sport;
                        __be16  dport;
                } ports;

                struct {
                        __u8    type;
                        __u8    code;
                } icmpt;

                struct {
                        __le16  sport;
                        __le16  dport;
                } dnports;

                __be32          spi;

                struct {
                        __u8    type;
                } mht;
        } uli_u;
#define fl_ip_sport     uli_u.ports.sport
#define fl_ip_dport     uli_u.ports.dport
#define fl_icmp_type    uli_u.icmpt.type
#define fl_icmp_code    uli_u.icmpt.code
#define fl_ipsec_spi    uli_u.spi
#define fl_mh_type      uli_u.mht.type
        __u32           secid;  /* used by xfrm; see secid.txt */
} __attribute__((__aligned__(BITS_PER_LONG/8)));

#define FLOW_DIR_IN     0
#define FLOW_DIR_OUT    1
#define FLOW_DIR_FWD    2

struct sock;
typedef int (*flow_resolve_t)(struct flowi *key, u16 family, u8 dir,
                               void **objp, atomic_t **obj_refp);

extern void *flow_cache_lookup(struct flowi *key, u16 family, u8 dir,
                               flow_resolve_t resolver);
extern void flow_cache_flush(void);
extern atomic_t flow_cache_genid;

static inline int flow_cache_uli_match(struct flowi *fl1, struct flowi *fl2)
{
        return (fl1->proto == fl2->proto &&
                !memcmp(&fl1->uli_u, &fl2->uli_u, sizeof(fl1->uli_u)));
}

#endif