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https://gitea.osmocom.org/cellular-infrastructure/osmo-ggsn.git
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gtpie: add gtp_encaps a modern encapsulation method
No idea why the previous ones started at the second IE. Further add more length arguments to the encapsulation method. Change-Id: I8bb086c568e07052c52d880df06049490346e91e
This commit is contained in:
Alexander Couzens
186
gtp/gtpie.c
186
gtp/gtpie.c
@@ -944,3 +944,189 @@ int gtpie_encaps2(union gtpie_member ie[], unsigned int size,
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}
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return 0;
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}
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/*! Encode GTP packet payload from Array of Information Elements.
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* \param[in] ie Input Array of GTPIE
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* \param[in] ie_len Length of \a ie array
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* \param[in] pack Pointer to caller-allocated buffer for raw GTP packet (GTPIE_MAX length)
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* \param[in] pack_len Length of \a pack buffer
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* \param[out] encoded_len Encoded length of \a pack in bytes
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* \returns 0 on success; 2 for out-of-space
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* GTP requires a certain order, the call must follow those which are defined for every message */
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int gtpie_encaps3(union gtpie_member *ies[], unsigned int ie_len,
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void *pack, unsigned pack_len, unsigned *encoded_len)
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{
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unsigned int i;
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unsigned char *p;
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unsigned char *end;
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int iesize;
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union gtpie_member *ie;
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*encoded_len = 0;
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p = pack;
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memset(pack, 0, pack_len);
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end = p + pack_len;
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for (i = 0; i < ie_len; i++) {
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if (!ies[i])
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continue;
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ie = ies[i];
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if (GTPIE_DEBUG)
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printf
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("gtpie_encaps. Number %d, Type %d\n",
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i, ie->t);
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switch (ie->t) {
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case GTPIE_CAUSE: /* TV GTPIE types with value length 1 */
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case GTPIE_REORDER:
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case GTPIE_MAP_CAUSE:
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case GTPIE_MS_VALIDATED:
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case GTPIE_RECOVERY:
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case GTPIE_SELECTION_MODE:
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case GTPIE_TEARDOWN:
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case GTPIE_NSAPI:
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case GTPIE_RANAP_CAUSE:
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case GTPIE_RP_SMS:
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case GTPIE_RP:
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case GTPIE_MS_NOT_REACH:
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case GTPIE_BCM:
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iesize = 2;
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break;
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case GTPIE_PFI: /* TV GTPIE types with value length 2 */
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case GTPIE_CHARGING_C:
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case GTPIE_TRACE_REF:
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case GTPIE_TRACE_TYPE:
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iesize = 3;
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break;
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case GTPIE_QOS_PROFILE0: /* TV GTPIE types with value length 3 */
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case GTPIE_P_TMSI_S:
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iesize = 4;
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break;
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case GTPIE_TLLI: /* TV GTPIE types with value length 4 */
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case GTPIE_P_TMSI:
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case GTPIE_TEI_DI:
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case GTPIE_TEI_C:
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case GTPIE_CHARGING_ID:
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iesize = 5;
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break;
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case GTPIE_TEI_DII: /* TV GTPIE types with value length 5 */
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iesize = 6;
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break;
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case GTPIE_RAI: /* TV GTPIE types with value length 6 */
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iesize = 7;
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break;
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case GTPIE_RAB_CONTEXT: /* TV GTPIE types with value length 7 */
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iesize = 8;
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break;
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case GTPIE_IMSI: /* TV GTPIE types with value length 8 */
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iesize = 9;
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break;
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case GTPIE_AUTH_TRIPLET: /* TV GTPIE types with value length 28 */
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iesize = 29;
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break;
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case GTPIE_EXT_HEADER_T: /* GTP extension header */
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iesize = 2 + hton8(ie->ext.l);
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break;
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case GTPIE_EUA: /* TLV GTPIE types with length length 2 */
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case GTPIE_MM_CONTEXT:
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case GTPIE_PDP_CONTEXT:
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case GTPIE_APN:
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case GTPIE_PCO:
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case GTPIE_GSN_ADDR:
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case GTPIE_MSISDN:
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case GTPIE_QOS_PROFILE:
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case GTPIE_AUTH_QUINTUP:
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case GTPIE_TFT:
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case GTPIE_TARGET_INF:
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case GTPIE_UTRAN_TRANS:
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case GTPIE_RAB_SETUP:
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case GTPIE_TRIGGER_ID:
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case GTPIE_OMC_ID:
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case GTPIE_RAN_T_CONTAIN:
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case GTPIE_PDP_CTX_PRIO:
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case GTPIE_ADDL_RAB_S_I:
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case GTPIE_SGSN_NUMBER:
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case GTPIE_COMMON_FLAGS:
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case GTPIE_APN_RESTR:
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case GTPIE_R_PRIO_LCS:
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case GTPIE_RAT_TYPE:
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case GTPIE_USER_LOC:
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case GTPIE_MS_TZ:
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case GTPIE_IMEI_SV:
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case GTPIE_CML_CHG_I_CT:
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case GTPIE_MBMS_UE_CTX:
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case GTPIE_TMGI:
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case GTPIE_RIM_ROUT_ADDR:
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case GTPIE_MBMS_PCO:
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case GTPIE_MBMS_SA:
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case GTPIE_SRNC_PDCP_CTX:
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case GTPIE_ADDL_TRACE:
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case GTPIE_HOP_CTR:
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case GTPIE_SEL_PLMN_ID:
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case GTPIE_MBMS_SESS_ID:
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case GTPIE_MBMS_2_3G_IND:
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case GTPIE_ENH_NSAPI:
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case GTPIE_MBMS_SESS_DUR:
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case GTPIE_A_MBMS_TRAC_I:
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case GTPIE_MBMS_S_REP_N:
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case GTPIE_MBMS_TTDT:
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case GTPIE_PS_HO_REQ_CTX:
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case GTPIE_BSS_CONTAINER:
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case GTPIE_CELL_ID:
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case GTPIE_PDU_NUMBERS:
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case GTPIE_BSSGP_CAUSE:
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case GTPIE_RQD_MBMS_BCAP:
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case GTPIE_RIM_RA_DISCR:
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case GTPIE_L_SETUP_PFCS:
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case GTPIE_PS_HO_XID_PAR:
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case GTPIE_MS_CHG_REP_A:
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case GTPIE_DIR_TUN_FLAGS:
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case GTPIE_CORREL_ID:
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case GTPIE_MBMS_FLOWI:
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case GTPIE_MBMS_MC_DIST:
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case GTPIE_MBMS_DIST_ACK:
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case GTPIE_R_IRAT_HO_INF:
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case GTPIE_RFSP_IDX:
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case GTPIE_FQDN:
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case GTPIE_E_ALL_PRIO_1:
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case GTPIE_E_ALL_PRIO_2:
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case GTPIE_E_CMN_FLAGS:
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case GTPIE_U_CSG_INFO:
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case GTPIE_CSG_I_REP_ACT:
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case GTPIE_CSG_ID:
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case GTPIE_CSG_MEMB_IND:
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case GTPIE_AMBR:
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case GTPIE_UE_NET_CAPA:
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case GTPIE_UE_AMBR:
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case GTPIE_APN_AMBR_NS:
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case GTPIE_GGSN_BACKOFF:
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case GTPIE_S_PRIO_IND:
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case GTPIE_S_PRIO_IND_NS:
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case GTPIE_H_BR_16MBPS_F:
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case GTPIE_A_MMCTX_SRVCC:
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case GTPIE_A_FLAGS_SRVCC:
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case GTPIE_STN_SR:
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case GTPIE_C_MSISDN:
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case GTPIE_E_RANAP_CAUSE:
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case GTPIE_ENODEB_ID:
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case GTPIE_SEL_MODE_NS:
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case GTPIE_ULI_TIMESTAMP:
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case GTPIE_CHARGING_ADDR:
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case GTPIE_PRIVATE:
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iesize = 3 + hton16(ie->tlv.l);
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break;
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default:
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return 2; /* We received something unknown */
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}
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if (p + iesize < end) {
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memcpy(p, ie, iesize);
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p += iesize;
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*encoded_len += iesize;
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} else
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return 2; /* Out of space */
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}
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return 0;
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}
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@@ -321,5 +321,7 @@ extern int gtpie_decaps(union gtpie_member *ie[], int version,
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extern int gtpie_encaps(union gtpie_member *ie[], void *pack, unsigned *len);
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extern int gtpie_encaps2(union gtpie_member ie[], unsigned int size,
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void *pack, unsigned *len);
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extern int gtpie_encaps3(union gtpie_member *ie[], unsigned int ie_len,
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void *pack, unsigned pack_len, unsigned *encoded_len);
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#endif /* !_GTPIE_H */
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