include/net/flow.h

Source file repositories/reference/linux-study-clean/include/net/flow.h

File Facts

System
Linux kernel
Corpus path
include/net/flow.h
Extension
.h
Size
5207 bytes
Lines
199
Domain
Networking Core
Bucket
Sockets, Protocols, Packet Path, And Network Policy
Inferred role
Networking Core: implementation source
Status
source implementation candidate

Why This File Exists

Networking stack implementation surface: socket APIs, protocol dispatch, packet flow, routing, filtering, and network namespaces.

Dependency Surface

Detected Declarations

Annotated Snippet

struct flowi_tunnel {
	__be64			tun_id;
};

struct flowi_common {
	int	flowic_oif;
	int	flowic_iif;
	int     flowic_l3mdev;
	__u32	flowic_mark;
	dscp_t	flowic_dscp;
	__u8	flowic_scope;
	__u8	flowic_proto;
	__u8	flowic_flags;
#define FLOWI_FLAG_ANYSRC		0x01
#define FLOWI_FLAG_KNOWN_NH		0x02
#define FLOWI_FLAG_L3MDEV_OIF		0x04
#define FLOWI_FLAG_ANY_SPORT		0x08
	__u32	flowic_secid;
	kuid_t  flowic_uid;
	__u32		flowic_multipath_hash;
	struct flowi_tunnel flowic_tun_key;
};

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

	struct {
		__u8	type;
		__u8	code;
	} icmpt;

	__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_l3mdev		__fl_common.flowic_l3mdev
#define flowi4_mark		__fl_common.flowic_mark
#define flowi4_dscp		__fl_common.flowic_dscp
#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
#define flowi4_multipath_hash	__fl_common.flowic_multipath_hash

	/* (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_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_l3mdev = 0;
	fl4->flowi4_mark = mark;
	fl4->flowi4_dscp = inet_dsfield_to_dscp(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;

Annotation

Implementation Notes