include/net/gtp.h

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

File Facts

System
Linux kernel
Corpus path
include/net/gtp.h
Extension
.h
Size
1550 bytes
Lines
87
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 gtp0_header {	/* According to GSM TS 09.60. */
	__u8	flags;
	__u8	type;
	__be16	length;
	__be16	seq;
	__be16	flow;
	__u8	number;
	__u8	spare[3];
	__be64	tid;
} __attribute__ ((packed));

struct gtp1_header {	/* According to 3GPP TS 29.060. */
	__u8	flags;
	__u8	type;
	__be16	length;
	__be32	tid;
} __attribute__ ((packed));

struct gtp1_header_long {	/* According to 3GPP TS 29.060. */
	__u8	flags;
	__u8	type;
	__be16	length;
	__be32	tid;
	__be16	seq;
	__u8	npdu;
	__u8	next;
} __packed;

/* GTP Information Element */
struct gtp_ie {
	__u8	tag;
	__u8	val;
} __packed;

struct gtp0_packet {
	struct gtp0_header gtp0_h;
	struct gtp_ie ie;
} __packed;

struct gtp1u_packet {
	struct gtp1_header_long gtp1u_h;
	struct gtp_ie ie;
} __packed;

struct gtp_pdu_session_info {	/* According to 3GPP TS 38.415. */
	u8	pdu_type;
	u8	qfi;
};

static inline bool netif_is_gtp(const struct net_device *dev)
{
	return dev->rtnl_link_ops &&
		!strcmp(dev->rtnl_link_ops->kind, "gtp");
}

#define GTP1_F_NPDU	0x01
#define GTP1_F_SEQ	0x02
#define GTP1_F_EXTHDR	0x04
#define GTP1_F_MASK	0x07

struct gtp_ext_hdr {
	__u8	len;
	__u8	data[];
};

#endif

Annotation

Implementation Notes