include/net/gtp.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _GTP_H_
   3 #define _GTP_H_
   4
   5 #include <linux/netdevice.h>
   6 #include <linux/types.h>
   7 #include <net/rtnetlink.h>
   8
   9 /* General GTP protocol related definitions. */
  10
  11 #define GTP0_PORT       3386
  12 #define GTP1U_PORT      2152
  13
  14 /* GTP messages types */
  15 #define GTP_ECHO_REQ    1       /* Echo Request */
  16 #define GTP_ECHO_RSP    2       /* Echo Response */
  17 #define GTP_TPDU        255
  18
  19 #define GTPIE_RECOVERY  14
  20
  21 struct gtp0_header {    /* According to GSM TS 09.60. */
  22         __u8    flags;
  23         __u8    type;
  24         __be16  length;
  25         __be16  seq;
  26         __be16  flow;
  27         __u8    number;
  28         __u8    spare[3];
  29         __be64  tid;
  30 } __attribute__ ((packed));
  31
  32 struct gtp1_header {    /* According to 3GPP TS 29.060. */
  33         __u8    flags;
  34         __u8    type;
  35         __be16  length;
  36         __be32  tid;
  37 } __attribute__ ((packed));
  38
  39 struct gtp1_header_long {       /* According to 3GPP TS 29.060. */
  40         __u8    flags;
  41         __u8    type;
  42         __be16  length;
  43         __be32  tid;
  44         __be16  seq;
  45         __u8    npdu;
  46         __u8    next;
  47 } __packed;
  48
  49 /* GTP Information Element */
  50 struct gtp_ie {
  51         __u8    tag;
  52         __u8    val;
  53 } __packed;
  54
  55 struct gtp0_packet {
  56         struct gtp0_header gtp0_h;
  57         struct gtp_ie ie;
  58 } __packed;
  59
  60 struct gtp1u_packet {
  61         struct gtp1_header_long gtp1u_h;
  62         struct gtp_ie ie;
  63 } __packed;
  64
  65 struct gtp_pdu_session_info {   /* According to 3GPP TS 38.415. */
  66         u8      pdu_type;
  67         u8      qfi;
  68 };
  69
  70 static inline bool netif_is_gtp(const struct net_device *dev)
  71 {
  72         return dev->rtnl_link_ops &&
  73                 !strcmp(dev->rtnl_link_ops->kind, "gtp");
  74 }
  75
  76 #define GTP1_F_NPDU     0x01
  77 #define GTP1_F_SEQ      0x02
  78 #define GTP1_F_EXTHDR   0x04
  79 #define GTP1_F_MASK     0x07
  80
  81 #endif