Release 4.12 include/net/flow.h

/*
 *
 *      Generic internet FLOW.
 *
 */

#ifndef _NET_FLOW_H

#define _NET_FLOW_H

#include <linux/socket.h>
#include <linux/in6.h>
#include <linux/atomic.h>
#include <net/flow_dissector.h>
#include <linux/uidgid.h>

/*
 * ifindex generation is per-net namespace, and loopback is
 * always the 1st device in ns (see net_dev_init), thus any
 * loopback device should get ifindex 1
 */


#define LOOPBACK_IFINDEX	1


struct flowi_tunnel {
	
__be64			tun_id;
};


struct flowi_common {
	
int	flowic_oif;
	
int	flowic_iif;
	
__u32	flowic_mark;
	
__u8	flowic_tos;
	
__u8	flowic_scope;
	
__u8	flowic_proto;
	
__u8	flowic_flags;

#define FLOWI_FLAG_ANYSRC		0x01

#define FLOWI_FLAG_KNOWN_NH		0x02

#define FLOWI_FLAG_SKIP_NH_OIF		0x04
	
__u32	flowic_secid;
	
struct flowi_tunnel flowic_tun_key;
	
kuid_t  flowic_uid;
};


union flowi_uli {
	struct {
		
__be16	dport;
		
__be16	sport;
	
} ports;

	struct {
		
__u8	type;
		
__u8	code;
	
} icmpt;

	struct {
		
__le16	dport;
		
__le16	sport;
	
} dnports;

	
__be32		spi;
	
__be32		gre_key;

	struct {
		
__u8	type;
	
} mht;
};


struct flowi4 {
	
struct flowi_common	__fl_common;

#define flowi4_oif		__fl_common.flowic_oif

#define flowi4_iif		__fl_common.flowic_iif

#define flowi4_mark		__fl_common.flowic_mark

#define flowi4_tos		__fl_common.flowic_tos

#define flowi4_scope		__fl_common.flowic_scope

#define flowi4_proto		__fl_common.flowic_proto

#define flowi4_flags		__fl_common.flowic_flags

#define flowi4_secid		__fl_common.flowic_secid

#define flowi4_tun_key		__fl_common.flowic_tun_key

#define flowi4_uid		__fl_common.flowic_uid

	/* (saddr,daddr) must be grouped, same order as in IP header */
	
__be32			saddr;
	
__be32			daddr;

	
union flowi_uli		uli;

#define fl4_sport		uli.ports.sport

#define fl4_dport		uli.ports.dport

#define fl4_icmp_type		uli.icmpt.type

#define fl4_icmp_code		uli.icmpt.code

#define fl4_ipsec_spi		uli.spi

#define fl4_mh_type		uli.mht.type

#define fl4_gre_key		uli.gre_key
} __attribute__((__aligned__(BITS_PER_LONG/8)));



static inline void flowi4_init_output(struct flowi4 *fl4, int oif,
				      __u32 mark, __u8 tos, __u8 scope,
				      __u8 proto, __u8 flags,
				      __be32 daddr, __be32 saddr,
				      __be16 dport, __be16 sport,
				      kuid_t uid)
{
	fl4->flowi4_oif = oif;
	fl4->flowi4_iif = LOOPBACK_IFINDEX;
	fl4->flowi4_mark = mark;
	fl4->flowi4_tos = tos;
	fl4->flowi4_scope = scope;
	fl4->flowi4_proto = proto;
	fl4->flowi4_flags = flags;
	fl4->flowi4_secid = 0;
	fl4->flowi4_tun_key.tun_id = 0;
	fl4->flowi4_uid = uid;
	fl4->daddr = daddr;
	fl4->saddr = saddr;
	fl4->fl4_dport = dport;
	fl4->fl4_sport = sport;
}

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/* Reset some input parameters after previous lookup */


static inline void flowi4_update_output(struct flowi4 *fl4, int oif, __u8 tos,
					__be32 daddr, __be32 saddr)
{
	fl4->flowi4_oif = oif;
	fl4->flowi4_tos = tos;
	fl4->daddr = daddr;
	fl4->saddr = saddr;
}
				      

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struct flowi6 {
	
struct flowi_common	__fl_common;

#define flowi6_oif		__fl_common.flowic_oif

#define flowi6_iif		__fl_common.flowic_iif

#define flowi6_mark		__fl_common.flowic_mark

#define flowi6_scope		__fl_common.flowic_scope

#define flowi6_proto		__fl_common.flowic_proto

#define flowi6_flags		__fl_common.flowic_flags

#define flowi6_secid		__fl_common.flowic_secid

#define flowi6_tun_key		__fl_common.flowic_tun_key

#define flowi6_uid		__fl_common.flowic_uid
	
struct in6_addr		daddr;
	
struct in6_addr		saddr;
	/* Note: flowi6_tos is encoded in flowlabel, too. */
	
__be32			flowlabel;
	
union flowi_uli		uli;

#define fl6_sport		uli.ports.sport

#define fl6_dport		uli.ports.dport

#define fl6_icmp_type		uli.icmpt.type

#define fl6_icmp_code		uli.icmpt.code

#define fl6_ipsec_spi		uli.spi

#define fl6_mh_type		uli.mht.type

#define fl6_gre_key		uli.gre_key
} __attribute__((__aligned__(BITS_PER_LONG/8)));


struct flowidn {
	
struct flowi_common	__fl_common;

#define flowidn_oif		__fl_common.flowic_oif

#define flowidn_iif		__fl_common.flowic_iif

#define flowidn_mark		__fl_common.flowic_mark

#define flowidn_scope		__fl_common.flowic_scope

#define flowidn_proto		__fl_common.flowic_proto

#define flowidn_flags		__fl_common.flowic_flags
	
__le16			daddr;
	
__le16			saddr;
	
union flowi_uli		uli;

#define fld_sport		uli.ports.sport

#define fld_dport		uli.ports.dport
} __attribute__((__aligned__(BITS_PER_LONG/8)));


struct flowi {
	union {
		
struct flowi_common	__fl_common;
		
struct flowi4		ip4;
		
struct flowi6		ip6;
		
struct flowidn		dn;
	
} u;

#define flowi_oif	u.__fl_common.flowic_oif

#define flowi_iif	u.__fl_common.flowic_iif

#define flowi_mark	u.__fl_common.flowic_mark

#define flowi_tos	u.__fl_common.flowic_tos

#define flowi_scope	u.__fl_common.flowic_scope

#define flowi_proto	u.__fl_common.flowic_proto

#define flowi_flags	u.__fl_common.flowic_flags

#define flowi_secid	u.__fl_common.flowic_secid

#define flowi_tun_key	u.__fl_common.flowic_tun_key

#define flowi_uid	u.__fl_common.flowic_uid
} __attribute__((__aligned__(BITS_PER_LONG/8)));



static inline struct flowi *flowi4_to_flowi(struct flowi4 *fl4)
{
	return container_of(fl4, struct flowi, u.ip4);
}

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static inline struct flowi *flowi6_to_flowi(struct flowi6 *fl6)
{
	return container_of(fl6, struct flowi, u.ip6);
}

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static inline struct flowi *flowidn_to_flowi(struct flowidn *fldn)
{
	return container_of(fldn, struct flowi, u.dn);
}

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typedef unsigned long flow_compare_t;



static inline unsigned int flow_key_size(u16 family)
{
	switch (family) {
	case AF_INET:
		BUILD_BUG_ON(sizeof(struct flowi4) % sizeof(flow_compare_t));
		return sizeof(struct flowi4) / sizeof(flow_compare_t);
	case AF_INET6:
		BUILD_BUG_ON(sizeof(struct flowi6) % sizeof(flow_compare_t));
		return sizeof(struct flowi6) / sizeof(flow_compare_t);
	case AF_DECnet:
		BUILD_BUG_ON(sizeof(struct flowidn) % sizeof(flow_compare_t));
		return sizeof(struct flowidn) / sizeof(flow_compare_t);
	}
	return 0;
}

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#define FLOW_DIR_IN	0

#define FLOW_DIR_OUT	1

#define FLOW_DIR_FWD	2

struct net;
struct sock;
struct flow_cache_ops;


struct flow_cache_object {
	
const struct flow_cache_ops *ops;
};


struct flow_cache_ops {
	
struct flow_cache_object *(*get)(struct flow_cache_object *);
	
int (*check)(struct flow_cache_object *);
	
void (*delete)(struct flow_cache_object *);
};


typedef struct flow_cache_object *(*flow_resolve_t)(
		struct net *net, const struct flowi *key, u16 family,
		u8 dir, struct flow_cache_object *oldobj, void *ctx);

struct flow_cache_object *flow_cache_lookup(struct net *net,
					    const struct flowi *key, u16 family,
					    u8 dir, flow_resolve_t resolver,
					    void *ctx);
int flow_cache_init(struct net *net);
void flow_cache_fini(struct net *net);
void flow_cache_hp_init(void);

void flow_cache_flush(struct net *net);
void flow_cache_flush_deferred(struct net *net);
extern atomic_t flow_cache_genid;

__u32 __get_hash_from_flowi6(const struct flowi6 *fl6, struct flow_keys *keys);



static inline __u32 get_hash_from_flowi6(const struct flowi6 *fl6)
{
	struct flow_keys keys;

	return __get_hash_from_flowi6(fl6, &keys);
}

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__u32 __get_hash_from_flowi4(const struct flowi4 *fl4, struct flow_keys *keys);



static inline __u32 get_hash_from_flowi4(const struct flowi4 *fl4)
{
	struct flow_keys keys;

	return __get_hash_from_flowi4(fl4, &keys);
}

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#endif
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Directory: include/net

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