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gsup: Add PCO IE 

This IE is present in the ePDG Tunnel Request/Result messages to forward
protocol configs between the UE (IKEv2) and the PGW (GTPv2C), with ePDG in the middle.

https://gerrit.osmocom.org/c/osmo-gsm-manuals/+/36023
https://gerrit.osmocom.org/c/libosmocore/+/36024
This commit is contained in:
Pau Espin 2024-02-21 18:51:22 +01:00 committed by Alexis La Goutte
parent 46123c430a
commit fdcc57302f
1 changed files with 20 additions and 0 deletions
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20
epan/dissectors/packet-gsm_gsup.c
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@ -79,6 +79,7 @@ enum osmo_gsup_iei {
OSMO_GSUP_ACCESS_POINT_NAME_IE = 0x12,
OSMO_GSUP_PDP_QOS_IE = 0x13,
OSMO_GSUP_CHARG_CHAR_IE = 0x14,
OSMO_GSUP_PCO_IE = 0x15,
OSMO_GSUP_RAND_IE = 0x20,
OSMO_GSUP_SRES_IE = 0x21,
OSMO_GSUP_KC_IE = 0x22,
@ -343,6 +344,7 @@ static const value_string gsup_iei_types[] = {
{ OSMO_GSUP_ACCESS_POINT_NAME_IE, "Access Point Name (APN)" },
{ OSMO_GSUP_PDP_QOS_IE, "PDP Quality of Service (QoS)" },
{ OSMO_GSUP_CHARG_CHAR_IE, "Charging Character" },
{ OSMO_GSUP_PCO_IE, "Protocol Configuration Options" },
{ OSMO_GSUP_RAND_IE, "RAND" },
{ OSMO_GSUP_SRES_IE, "SRES" },
{ OSMO_GSUP_KC_IE, "Kc" },
@ -721,6 +723,7 @@ dissect_gsup_tlvs(tvbuff_t *tvb, int base_offs, int length, packet_info *pinfo,
gint apn_len;
guint32 ui32;
guint8 i;
tvbuff_t *subset_tvb;
tag = tvb_get_guint8(tvb, offset);
offset++;
@ -816,6 +819,23 @@ dissect_gsup_tlvs(tvbuff_t *tvb, int base_offs, int length, packet_info *pinfo,
case OSMO_GSUP_CHARG_CHAR_IE:
proto_tree_add_item(att_tree, hf_gsup_charg_char, tvb, offset, len, ENC_ASCII);
break;
case OSMO_GSUP_PCO_IE:
switch (msg_type) {
case OSMO_GSUP_MSGT_EPDG_TUNNEL_REQUEST:
/* PCO options as MS to network direction */
pinfo->link_dir = P2P_DIR_UL;
break;
case OSMO_GSUP_MSGT_EPDG_TUNNEL_ERROR:
case OSMO_GSUP_MSGT_EPDG_TUNNEL_RESULT:
/* PCO options as Network to MS direction: */
pinfo->link_dir = P2P_DIR_DL;
break;
default:
break;
}
subset_tvb = tvb_new_subset_length(tvb, offset, len);
de_sm_pco(subset_tvb, att_tree, pinfo, 0, len, NULL, 0);
break;
case OSMO_GSUP_CAUSE_IE:
proto_tree_add_item(att_tree, hf_gsup_cause, tvb, offset, len, ENC_NA);
break;