/* * OsmoGGSN - Gateway GPRS Support Node * Copyright (C) 2002, 2003, 2004 Mondru AB. * * The contents of this file may be used under the terms of the GNU * General Public License Version 2, provided that the above copyright * notice and this permission notice is included in all copies or * substantial portions of the software. * */ #ifndef _GTP_H #define _GTP_H #include #include "gtpie.h" #include "pdp.h" #include "gsn.h" #define GTP0_PORT 3386 #define GTP1C_PORT 2123 #define GTP1U_PORT 2152 #define PACKET_MAX 8196 #define GTP_MAX 0xffff /* TODO: Choose right number */ #define GTP0_HEADER_SIZE 20 #define GTP1_HEADER_SIZE_SHORT 8 #define GTP1_HEADER_SIZE_LONG 12 #define NAMESIZE 1024 #define SYSLOG_PRINTSIZE 255 #define ERRMSG_SIZE 255 /* GTP version 1 extension header type definitions. */ #define GTP_EXT_PDCP_PDU 0xC0 /* PDCP PDU Number */ /* GTP version 1 message type definitions. Also covers version 0 except * * for anonymous PDP context which was superceded in version 1 */ /* 0 For future use. */ #define GTP_ECHO_REQ 1 /* Echo Request */ #define GTP_ECHO_RSP 2 /* Echo Response */ #define GTP_NOT_SUPPORTED 3 /* Version Not Supported */ #define GTP_ALIVE_REQ 4 /* Node Alive Request */ #define GTP_ALIVE_RSP 5 /* Node Alive Response */ #define GTP_REDIR_REQ 6 /* Redirection Request */ #define GTP_REDIR_RSP 7 /* Redirection Response */ /* 8-15 For future use. */ #define GTP_CREATE_PDP_REQ 16 /* Create PDP Context Request */ #define GTP_CREATE_PDP_RSP 17 /* Create PDP Context Response */ #define GTP_UPDATE_PDP_REQ 18 /* Update PDP Context Request */ #define GTP_UPDATE_PDP_RSP 19 /* Update PDP Context Response */ #define GTP_DELETE_PDP_REQ 20 /* Delete PDP Context Request */ #define GTP_DELETE_PDP_RSP 21 /* Delete PDP Context Response */ /* 22-25 For future use. *//* In version GTP 1 anonomous PDP context */ #define GTP_ERROR 26 /* Error Indication */ #define GTP_PDU_NOT_REQ 27 /* PDU Notification Request */ #define GTP_PDU_NOT_RSP 28 /* PDU Notification Response */ #define GTP_PDU_NOT_REJ_REQ 29 /* PDU Notification Reject Request */ #define GTP_PDU_NOT_REJ_RSP 30 /* PDU Notification Reject Response */ #define GTP_SUPP_EXT_HEADER 31 /* Supported Extension Headers Notification */ #define GTP_SND_ROUTE_REQ 32 /* Send Routeing Information for GPRS Request */ #define GTP_SND_ROUTE_RSP 33 /* Send Routeing Information for GPRS Response */ #define GTP_FAILURE_REQ 34 /* Failure Report Request */ #define GTP_FAILURE_RSP 35 /* Failure Report Response */ #define GTP_MS_PRESENT_REQ 36 /* Note MS GPRS Present Request */ #define GTP_MS_PRESENT_RSP 37 /* Note MS GPRS Present Response */ /* 38-47 For future use. */ #define GTP_IDEN_REQ 48 /* Identification Request */ #define GTP_IDEN_RSP 49 /* Identification Response */ #define GTP_SGSN_CONTEXT_REQ 50 /* SGSN Context Request */ #define GTP_SGSN_CONTEXT_RSP 51 /* SGSN Context Response */ #define GTP_SGSN_CONTEXT_ACK 52 /* SGSN Context Acknowledge */ #define GTP_FWD_RELOC_REQ 53 /* Forward Relocation Request */ #define GTP_FWD_RELOC_RSP 54 /* Forward Relocation Response */ #define GTP_FWD_RELOC_COMPL 55 /* Forward Relocation Complete */ #define GTP_RELOC_CANCEL_REQ 56 /* Relocation Cancel Request */ #define GTP_RELOC_CANCEL_RSP 57 /* Relocation Cancel Response */ #define GTP_FWD_SRNS 58 /* Forward SRNS Context */ #define GTP_FWD_RELOC_ACK 59 /* Forward Relocation Complete Acknowledge */ #define GTP_FWD_SRNS_ACK 60 /* Forward SRNS Context Acknowledge */ #define GTP_RAN_INFO_RELAY 70 /* RAN Information Relay */ /* 61-239 For future use. */ #define GTP_DATA_TRAN_REQ 240 /* Data Record Transfer Request */ #define GTP_DATA_TRAN_RSP 241 /* Data Record Transfer Response */ /* 242-254 For future use. */ #define GTP_GPDU 255 /* G-PDU */ extern const struct value_string gtp_type_names[]; static inline const char *gtp_type_name(uint8_t val) { return get_value_string(gtp_type_names, val); } /* GTP information element cause codes from 29.060 v3.9.0 7.7 */ /* */ #define GTPCAUSE_REQ_IMSI 0 /* Request IMSI */ #define GTPCAUSE_REQ_IMEI 1 /* Request IMEI */ #define GTPCAUSE_REQ_IMSI_IMEI 2 /* Request IMSI and IMEI */ #define GTPCAUSE_NO_ID_NEEDED 3 /* No identity needed */ #define GTPCAUSE_MS_REFUSES_X 4 /* MS refuses */ #define GTPCAUSE_MS_NOT_RESP_X 5 /* MS is not GPRS responding */ /* 6-48 For future use */ /* 49-63 Cause values reserved for GPRS charging protocol use (See GTP' in GSM 12.15) */ /* 64-127 For future use */ #define GTPCAUSE_ACC_REQ 128 /* Request accepted */ #define GTPCAUSE_NEW_PDP_NET_PREF 129 /* New PDP type due to network preference */ #define GTPCAUSE_NEW_PDP_ADDR_BEAR 130 /* New PDP type due to single address bearer only */ /* 131-176 For future use */ /* 177-191 Cause values reserved for GPRS charging protocol use (See GTP' In GSM 12.15) */ #define GTPCAUSE_NON_EXIST 192 /* Non-existent */ #define GTPCAUSE_INVALID_MESSAGE 193 /* Invalid message format */ #define GTPCAUSE_IMSI_NOT_KNOWN 194 /* IMSI not known */ #define GTPCAUSE_MS_DETACHED 195 /* MS is GPRS detached */ #define GTPCAUSE_MS_NOT_RESP 196 /* MS is not GPRS responding */ #define GTPCAUSE_MS_REFUSES 197 /* MS refuses */ /* 198 For future use */ #define GTPCAUSE_NO_RESOURCES 199 /* No resources available */ #define GTPCAUSE_NOT_SUPPORTED 200 /* Service not supported */ #define GTPCAUSE_MAN_IE_INCORRECT 201 /* Mandatory IE incorrect */ #define GTPCAUSE_MAN_IE_MISSING 202 /* Mandatory IE missing */ #define GTPCAUSE_OPT_IE_INCORRECT 203 /* Optional IE incorrect */ #define GTPCAUSE_SYS_FAIL 204 /* System failure */ #define GTPCAUSE_ROAMING_REST 205 /* Roaming Restriction */ #define GTPCAUSE_PTIMSI_MISMATCH 206 /* P-TMSI signature mismatch */ #define GTPCAUSE_CONN_SUSP 207 /* GPRS connection suspended */ #define GTPCAUSE_AUTH_FAIL 208 /* Authentication failure */ #define GTPCAUSE_USER_AUTH_FAIL 209 /* User authentication failed */ #define GTPCAUSE_CONTEXT_NOT_FOUND 210 /* Context not found */ #define GTPCAUSE_ADDR_OCCUPIED 211 /* All dynamic PDP addresses are occupied */ #define GTPCAUSE_NO_MEMORY 212 /* No memory is available */ #define GTPCAUSE_RELOC_FAIL 213 /* Relocation failure */ #define GTPCAUSE_UNKNOWN_MAN_EXTHEADER 214 /* Unknown mandatory extension header */ #define GTPCAUSE_SEM_ERR_TFT 215 /* Semantic error in the TFT operation */ #define GTPCAUSE_SYN_ERR_TFT 216 /* Syntactic error in the TFT operation */ #define GTPCAUSE_SEM_ERR_FILTER 217 /* Semantic errors in packet filter(s) */ #define GTPCAUSE_SYN_ERR_FILTER 218 /* Syntactic errors in packet filter(s) */ #define GTPCAUSE_MISSING_APN 219 /* Missing or unknown APN */ #define GTPCAUSE_UNKNOWN_PDP 220 /* Unknown PDP address or PDP type */ /* 221-240 For future use */ /* 241-255 Cause Values Reserved For Gprs Charging Protocol Use (See Gtp' In Gsm 12.15) */ static inline bool gtp_cause_successful(uint8_t cause) { return cause == GTPCAUSE_ACC_REQ || cause == GTPCAUSE_NEW_PDP_NET_PREF || cause == GTPCAUSE_NEW_PDP_ADDR_BEAR; } struct ul66_t; struct ul16_t; struct pdp_t; /* GTP 0 header. * Explanation to some of the fields: * SNDCP NPDU Number flag = 0 except for inter SGSN handover situations * SNDCP N-PDU LCC Number 0 = 0xff except for inter SGSN handover situations * Sequence number. Used for reliable delivery of signalling messages, and * to discard "illegal" data messages. * Flow label. Is used to point a particular PDP context. Is used in data * messages as well as signalling messages related to a particular context. * Tunnel ID is IMSI+NSAPI. Unique identifier of PDP context. Is somewhat * redundant because the header also includes flow. */ struct gtp0_header { /* Descriptions from 3GPP 09.60 */ uint8_t flags; /* 01 bitfield, with typical values */ /* 000..... Version: 1 (0) */ /* ...1111. Spare (7) */ /* .......0 SNDCP N-PDU Number flag (0) */ uint8_t type; /* 02 Message type. T-PDU = 0xff */ uint16_t length; /* 03 Length (of G-PDU excluding header) */ uint16_t seq; /* 05 Sequence Number */ uint16_t flow; /* 07 Flow Label ( = 0 for signalling) */ uint8_t number; /* 09 SNDCP N-PDU LCC Number ( 0 = 0xff) */ uint8_t spare1; /* 10 Spare */ uint8_t spare2; /* 11 Spare */ uint8_t spare3; /* 12 Spare */ uint64_t tid; /* 13 Tunnel ID */ } __attribute__((packed)); /* 20 */ #define GTP1HDR_F_NPDU 0x01 #define GTP1HDR_F_SEQ 0x02 #define GTP1HDR_F_EXT 0x04 #define GTP1HDR_F_GTP1 0x10 #define GTPHDR_F_VER(n) ((n) << 5) #define GTPHDR_F_GET_VER(flags) ((flags)>>5) struct gtp1_header_short { /* Descriptions from 3GPP 29060 */ uint8_t flags; /* 01 bitfield, with typical values */ /* 001..... Version: 1 */ /* ...1.... Protocol Type: GTP=1, GTP'=0 */ /* ....0... Spare = 0 */ /* .....0.. Extension header flag: 0 */ /* ......0. Sequence number flag: 0 */ /* .......0 PN: N-PDU Number flag */ uint8_t type; /* 02 Message type. T-PDU = 0xff */ uint16_t length; /* 03 Length (of IP packet or signalling) */ uint32_t tei; /* 05 - 08 Tunnel Endpoint ID */ } __attribute__((packed)); struct gtp1_header_long { /* Descriptions from 3GPP 29060 */ uint8_t flags; /* 01 bitfield, with typical values */ /* 001..... Version: 1 */ /* ...1.... Protocol Type: GTP=1, GTP'=0 */ /* ....0... Spare = 0 */ /* .....0.. Extension header flag: 0 */ /* ......1. Sequence number flag: 1 */ /* .......0 PN: N-PDU Number flag */ uint8_t type; /* 02 Message type. T-PDU = 0xff */ uint16_t length; /* 03 Length (of IP packet or signalling) */ uint32_t tei; /* 05 Tunnel Endpoint ID */ uint16_t seq; /* 10 Sequence Number */ uint8_t npdu; /* 11 N-PDU Number */ uint8_t next; /* 12 Next extension header type. Empty = 0 */ } __attribute__((packed)); struct gtp0_packet { struct gtp0_header h; uint8_t p[GTP_MAX]; } __attribute__ ((packed)); struct gtp1_packet_short { struct gtp1_header_short h; uint8_t p[GTP_MAX]; } __attribute__ ((packed)); struct gtp1_packet_long { struct gtp1_header_long h; uint8_t p[GTP_MAX]; } __attribute__ ((packed)); union gtp_packet { uint8_t flags; struct gtp0_packet gtp0; struct gtp1_packet_short gtp1s; struct gtp1_packet_long gtp1l; } __attribute__ ((packed)); /* External API functions */ extern const char *gtp_version(); extern int gtp_create_context_req(struct gsn_t *gsn, struct pdp_t *pdp, void *cbp); extern int gtp_create_context_resp(struct gsn_t *gsn, struct pdp_t *pdp, int cause); extern int gtp_update_context(struct gsn_t *gsn, struct pdp_t *pdp, void *cbp, struct in_addr *inetaddr); extern int gtp_update_context_resp(struct gsn_t *gsn, struct pdp_t *pdp, int cause); extern int gtp_delete_context_req(struct gsn_t *gsn, struct pdp_t *pdp, void *cbp, int teardown) OSMO_DEPRECATED("Use gtp_delete_context_req2() instead, to avoid freeing pdp ctx before reply"); extern int gtp_delete_context_req2(struct gsn_t *gsn, struct pdp_t *pdp, void *cbp, int teardown); extern int gtp_data_req(struct gsn_t *gsn, struct pdp_t *pdp, void *pack, unsigned len); extern int gtp_ran_info_relay_req(struct gsn_t *gsn, const struct sockaddr_in *peer, const uint8_t *ran_container, size_t ran_container_len, const uint8_t *rim_route_addr, size_t rim_route_addr_len, uint8_t rim_route_addr_discr); extern int gtp_decaps0(struct gsn_t *gsn); extern int gtp_decaps1c(struct gsn_t *gsn); extern int gtp_decaps1u(struct gsn_t *gsn); extern int gtp_echo_req(struct gsn_t *gsn, int version, void *cbp, struct in_addr *inetaddrs); extern int gsna2in_addr(struct in_addr *dst, struct ul16_t *gsna); extern const char *imsi_gtp2str(const uint64_t *imsi); #endif /* !_GTP_H */