mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
synced 2024-12-28 16:52:18 +00:00
b6fc0956ac
Currently GTP packets are dropped if the next extension field is set to non-zero value, but this are valid GTP packets. TS 29.281 provides a longer header format, which is defined as struct gtp1_header_long. Such long header format is used if any of the S, PN, E flags is set. This long header is 4 bytes longer than struct gtp1_header, plus variable length (optional) extension headers. The next extension header field is zero is no extension header is provided. The extension header is composed of a length field which includes total number of 4 byte words including the extension header itself (1 byte), payload (variable length) and next type (1 byte). The extension header size and its payload is aligned to 4 bytes. A GTP packet might come with a chain extensions headers, which makes it slightly cumbersome to parse because the extension next header field comes at the end of the extension header, and there is a need to check if this field becomes zero to stop the extension header parser. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
87 lines
1.5 KiB
C
87 lines
1.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _GTP_H_
|
|
#define _GTP_H_
|
|
|
|
#include <linux/netdevice.h>
|
|
#include <linux/types.h>
|
|
#include <net/rtnetlink.h>
|
|
|
|
/* General GTP protocol related definitions. */
|
|
|
|
#define GTP0_PORT 3386
|
|
#define GTP1U_PORT 2152
|
|
|
|
/* GTP messages types */
|
|
#define GTP_ECHO_REQ 1 /* Echo Request */
|
|
#define GTP_ECHO_RSP 2 /* Echo Response */
|
|
#define GTP_TPDU 255
|
|
|
|
#define GTPIE_RECOVERY 14
|
|
|
|
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
|