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l3_handler.c
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l3_handler.c
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <arpa/inet.h>
#include <osmocom/gsm/rsl.h>
#include <osmocom/gsm/tlv.h>
#include <osmocom/gsm/gsm48.h>
#include <osmocom/gsm/gsm48_ie.h>
#include <osmocom/gsm/gsm_utils.h>
#include <osmocom/gsm/protocol/gsm_04_08.h>
#include <osmocom/gsm/protocol/gsm_04_11.h>
#include <assert.h>
#include "session.h"
#include "bit_func.h"
#include "assignment.h"
#include "address.h"
#include "sms.h"
#include "cell_info.h"
#include "output.h"
#include "umts_rrc.h"
#include "lte_eps.h"
void handle_classmark(struct session_info *s, uint8_t *data, uint8_t type)
{
struct gsm48_classmark2 *cm2 = (struct gsm48_classmark2 *)data;
s->ms_cipher_mask |= !cm2->a5_1;
if (type == 2) {
s->ms_cipher_mask |= (cm2->a5_2 << 1);
s->ms_cipher_mask |= (cm2->a5_3 << 2);
}
}
void handle_lai(struct session_info *s, uint8_t *data, int cid)
{
struct gsm48_loc_area_id *lai = (struct gsm48_loc_area_id *) data;
s->mcc = get_mcc(lai->digits);
s->mnc = get_mnc(lai->digits);
s->lac = htons(lai->lac);
if (cid >= 0) {
s->cid = cid;
}
}
void handle_mi(struct session_info *s, uint8_t *data, uint8_t len, uint8_t new_tmsi)
{
char tmsi_str[9];
uint8_t mi_type;
if (len > GSM48_MI_SIZE) {
SET_MSG_INFO(s, "FAILED SANITY CHECKS (MI_LEN)");
return;
}
mi_type = data[0] & GSM_MI_TYPE_MASK;
switch (mi_type) {
case GSM_MI_TYPE_NONE:
break;
case GSM_MI_TYPE_IMSI:
bcd2str(data, s->imsi, len*2, 1);
APPEND_MSG_INFO(s, ", IMSI %s", s->imsi);
s->use_imsi = 1;
break;
case GSM_MI_TYPE_IMEI:
case GSM_MI_TYPE_IMEISV:
bcd2str(data, s->imei, 15, 1);
APPEND_MSG_INFO(s, ", IMEI %s", s->imei);
break;
case GSM_MI_TYPE_TMSI:
hex_bin2str(&data[1], tmsi_str, 4);
tmsi_str[8] = 0;
assert(s->new_msg);
APPEND_MSG_INFO(s, ", TMSI %s", tmsi_str);
if (new_tmsi) {
if (!not_zero(s->new_tmsi, 4)) {
memcpy(s->new_tmsi, &data[1], 4);
}
} else {
if (!not_zero(s->old_tmsi, 4)) {
memcpy(s->old_tmsi, &data[1], 4);
s->use_tmsi = 1;
}
}
break;
default:
SET_MSG_INFO(s, "FAILED SANITY CHECKS (MI_TYPE)");
return;
}
}
void handle_cmreq(struct session_info *s, uint8_t *data)
{
struct gsm48_service_request *cm = (struct gsm48_service_request *) data;
switch (cm->cm_service_type) {
case GSM48_CMSERV_EMERGENCY:
s->call_presence = 1;
strncpy(s->msisdn, "<emergency>", GSM48_MI_SIZE);
/* fall-through */
case GSM48_CMSERV_MO_CALL_PACKET:
s->call = 1;
break;
case GSM48_CMSERV_SMS:
s->sms = 1;
break;
case GSM48_CMSERV_SUP_SERV:
s->ssa = 1;
break;
default:
s->unknown = 1;
}
s->started = 1;
s->closed = 0;
s->initial_seq = cm->cipher_key_seq & 7;
handle_classmark(s, ((uint8_t *) &cm->classmark)+1, 2);
handle_mi(s, cm->mi, cm->mi_len, 0);
}
void handle_serv_req(struct session_info *s, uint8_t *data)
{
s->started = 1;
s->closed = 0;
s->initial_seq = data[0] & 7;
handle_mi(s, &data[2], data[1], 0);
}
void handle_pag_resp(struct session_info *s, uint8_t *data)
{
struct gsm48_pag_resp *pr = (struct gsm48_pag_resp *) data;
s->initial_seq = pr->key_seq;
s->mt = 1;
s->started = 1;
s->closed = 0;
handle_classmark(s, (uint8_t *) (&pr->classmark2) + 1, 2);
s->pag_mi = pr->mi[0] & GSM_MI_TYPE_MASK;
handle_mi(s, pr->mi, pr->mi_len, 0);
}
void handle_loc_upd_acc(struct session_info *s, uint8_t *data, unsigned len)
{
s->locupd = 1;
s->mo = 1;
s->lu_acc = 1;
handle_lai(s, data, -1);
if ((len > 11) && (data[5] == 0x17)) {
s->tmsi_realloc = 1;
handle_mi(s, &data[7], data[6], 1);
}
}
void handle_loc_upd_req(struct session_info *s, uint8_t *data)
{
struct gsm48_loc_upd_req *lu = (struct gsm48_loc_upd_req *) data;
s->mo = 1;
s->locupd = 1;
s->started = 1;
s->closed = 0;
s->lu_type = lu->type & 3;
s->initial_seq = lu->key_seq;
s->lu_mcc = get_mcc(lu->lai.digits);
s->lu_mnc = get_mnc(lu->lai.digits);
s->lu_lac = htons(lu->lai.lac);
handle_classmark(s, (uint8_t *) &lu->classmark1, 1);
handle_mi(s, lu->mi, lu->mi_len, 0);
}
void handle_detach(struct session_info *s, uint8_t *data)
{
struct gsm48_imsi_detach_ind *idi = (struct gsm48_imsi_detach_ind *) data;
s->started = 1;
s->closed = 0;
handle_classmark(s, (uint8_t *) &idi->classmark1, 1);
handle_mi(s, idi->mi, idi->mi_len, 0);
}
void handle_cc(struct session_info *s, struct gsm48_hdr *dtap, unsigned len, uint8_t ul)
{
struct tlv_parsed tp;
s->call = 1;
s->call_presence = 1;
switch (dtap->msg_type & 0x3f) {
case 0x01:
SET_MSG_INFO(s, "CALL ALERTING");
break;
case 0x02:
SET_MSG_INFO(s, "CALL PROCEEDING");
if (s->cipher && !s->fc.enc_rand && !ul)
s->fc.predict++;
if (!ul)
s->mo = 1;
break;
case 0x03:
SET_MSG_INFO(s, "CALL PROGRESS");
break;
case 0x05:
SET_MSG_INFO(s, "CALL SETUP");
if (!ul)
s->mt = 1;
else
s->mo = 1;
/* get MSISDN */
tlv_parse(&tp, &gsm48_att_tlvdef, dtap->data, len-2, 0, 0);
if (TLVP_PRESENT(&tp, GSM48_IE_CALLING_BCD)) {
uint8_t *v = (uint8_t *) TLVP_VAL(&tp, GSM48_IE_CALLING_BCD);
uint8_t v_len = TLVP_LEN(&tp, GSM48_IE_CALLING_BCD);
handle_address(v, v_len, s->msisdn, 0);
}
if (TLVP_PRESENT(&tp, GSM48_IE_CALLED_BCD)) {
uint8_t *v = (uint8_t *) TLVP_VAL(&tp, GSM48_IE_CALLED_BCD);
uint8_t v_len = TLVP_LEN(&tp, GSM48_IE_CALLED_BCD);
handle_address(v, v_len, s->msisdn, 0);
}
break;
case 0x07:
SET_MSG_INFO(s, "CALL CONNECT");
break;
case 0x08:
SET_MSG_INFO(s, "CALL CONFIRMED");
if (ul)
s->mt = 1;
else
s->mo = 1;
break;
case 0x0f:
SET_MSG_INFO(s, "CALL CONNECT ACK");
break;
case 0x25:
SET_MSG_INFO(s, "CALL DISCONNECT");
break;
case 0x2a:
SET_MSG_INFO(s, "CALL RELEASE COMPLETE");
break;
case 0x2d:
SET_MSG_INFO(s, "CALL RELEASE");
break;
case 0x3a:
SET_MSG_INFO(s, "CALL FACILITY");
break;
case 0x3d:
SET_MSG_INFO(s, "CALL STATUS");
break;
default:
SET_MSG_INFO(s, "UNKNOWN CC (%02x)", dtap->msg_type & 0x3f);
s->unknown = 1;
}
}
void handle_mm(struct session_info *s, struct gsm48_hdr *dtap, unsigned dtap_len, uint32_t fn)
{
if (dtap_len < sizeof(struct gsm48_hdr)) {
SET_MSG_INFO(s, "FAILED SANITY CHECKS (MM_LEN)");
return;
}
switch (dtap->msg_type & 0x3f) {
case 0x01:
session_reset(s, 1);
s->started = 1;
SET_MSG_INFO(s, "IMSI DETACH");
s->detach = 1;
s->mo = 1;
handle_detach(s, dtap->data);
break;
case 0x02:
SET_MSG_INFO(s, "LOC UPD ACCEPT");
handle_loc_upd_acc(s, dtap->data, dtap_len - 2);
break;
case 0x04:
SET_MSG_INFO(s, "LOC UPD REJECT cause=%d", dtap->data[0]);
s->locupd = 1;
s->lu_reject = 1;
s->lu_rej_cause = dtap->data[0];
s->mo = 1;
break;
case 0x08:
session_reset(s, 1);
if (dtap_len < sizeof(struct gsm48_loc_upd_req)) {
SET_MSG_INFO(s, "FAILED SANITY CHECKS (LUR_DTAP_SIZE)");
break;
}
SET_MSG_INFO(s, "LOC UPD REQUEST");
handle_loc_upd_req(s, dtap->data);
break;
case 0x12:
if ((dtap_len > 19) && (dtap->data[17] == 0x20) && (dtap->data[18] == 0x10)) {
SET_MSG_INFO(s, "AUTH REQUEST (UMTS)");
s->auth = 2;
} else {
SET_MSG_INFO(s, "AUTH REQUEST (GSM)");
s->auth = 1;
}
if (!s->auth_req_fn) {
if (fn) {
s->auth_req_fn = fn;
} else {
s->auth_req_fn = GSM_MAX_FN;
}
}
break;
case 0x14:
if ((dtap_len > 6) && (dtap->data[4] == 0x21) && (dtap->data[5] == 0x04)) {
SET_MSG_INFO(s, "AUTH RESPONSE (UMTS)");
if (!s->auth) {
s->auth = 2;
}
} else {
SET_MSG_INFO(s, "AUTH RESPONSE (GSM)");
if (!s->auth) {
s->auth = 1;
}
}
if (!s->auth_resp_fn) {
if (fn) {
s->auth_resp_fn = fn;
} else {
s->auth_resp_fn = GSM_MAX_FN;
}
}
break;
case 0x18:
switch (dtap->data[0] & GSM_MI_TYPE_MASK) {
case GSM_MI_TYPE_IMSI:
SET_MSG_INFO(s, "IDENTITY REQUEST, IMSI");
if (s->cipher) {
s->iden_imsi_ac = 1;
} else {
s->iden_imsi_bc = 1;
}
break;
case GSM_MI_TYPE_IMEI:
case GSM_MI_TYPE_IMEISV:
SET_MSG_INFO(s, "IDENTITY REQUEST, IMEI");
if (s->cipher) {
s->iden_imei_ac = 1;
} else {
s->iden_imei_bc = 1;
}
break;
}
break;
case 0x19:
handle_mi(s, &dtap->data[1], dtap->data[0], 0);
switch (dtap->data[1] & GSM_MI_TYPE_MASK) {
case GSM_MI_TYPE_IMSI:
SET_MSG_INFO(s, "IDENTITY RESPONSE, IMSI %s", s->imsi);
if (s->cipher) {
s->iden_imsi_ac = 1;
} else {
s->iden_imsi_bc = 1;
}
break;
case GSM_MI_TYPE_IMEI:
case GSM_MI_TYPE_IMEISV:
SET_MSG_INFO(s, "IDENTITY RESPONSE, IMEI %s", s->imei);
if (s->cipher) {
s->iden_imei_ac = 1;
} else {
s->iden_imei_bc = 1;
}
break;
}
break;
case 0x1a:
SET_MSG_INFO(s, "TMSI REALLOC COMMAND");
s->tmsi_realloc = 1;
handle_lai(s, dtap->data, -1);
handle_mi(s, &dtap->data[6], dtap->data[5], 1);
break;
case 0x1b:
SET_MSG_INFO(s, "TMSI REALLOC COMPLETE");
s->tmsi_realloc = 1;
break;
case 0x21:
SET_MSG_INFO(s, "CM SERVICE ACCEPT");
s->mo = 1;
break;
case 0x23:
SET_MSG_INFO(s, "CM SERVICE ABORT");
s->mo = 1;
break;
case 0x24:
SET_MSG_INFO(s, "CM SERVICE REQUEST");
session_reset(s, 1);
s->started = 1;
s->closed = 0;
s->serv_req = 1;
s->mo = 1;
handle_cmreq(s, dtap->data);
break;
case 0x29:
SET_MSG_INFO(s, "ABORT");
s->abort = 1;
break;
case 0x32:
SET_MSG_INFO(s, "MM INFORMATION");
break;
default:
SET_MSG_INFO(s, "UNKNOWN MM (%02x)", dtap->msg_type & 0x3f);
s->unknown = 1;
}
}
void handle_rr(struct session_info *s, struct gsm48_hdr *dtap, unsigned len, uint32_t fn)
{
struct gsm48_system_information_type_6 *si6;
struct tlv_parsed tp;
s->rat = RAT_GSM;
assert(s->new_msg);
if (!len) {
return;
}
switch (dtap->msg_type) {
case GSM48_MT_RR_SYSINFO_1:
SET_MSG_INFO(s, "SYSTEM INFO 1");
handle_sysinfo(s, dtap, len);
break;
case GSM48_MT_RR_SYSINFO_2:
SET_MSG_INFO(s, "SYSTEM INFO 2");
handle_sysinfo(s, dtap, len);
break;
case GSM48_MT_RR_SYSINFO_2bis:
SET_MSG_INFO(s, "SYSTEM INFO 2bis");
handle_sysinfo(s, dtap, len);
break;
case GSM48_MT_RR_SYSINFO_2ter:
SET_MSG_INFO(s, "SYSTEM INFO 2ter");
handle_sysinfo(s, dtap, len);
break;
case GSM48_MT_RR_SYSINFO_2quater:
SET_MSG_INFO(s, "SYSTEM INFO 2quater");
handle_sysinfo(s, dtap, len);
break;
case GSM48_MT_RR_SYSINFO_3:
SET_MSG_INFO(s, "SYSTEM INFO 3");
handle_sysinfo(s, dtap, len);
break;
case GSM48_MT_RR_SYSINFO_4:
SET_MSG_INFO(s, "SYSTEM INFO 4");
handle_sysinfo(s, dtap, len);
break;
case GSM48_MT_RR_SYSINFO_5:
SET_MSG_INFO(s, "SYSTEM INFO 5");
rand_check((uint8_t *)dtap, 18, &s->si5, s->cipher);
handle_sysinfo(s, dtap, len);
break;
case GSM48_MT_RR_SYSINFO_5bis:
SET_MSG_INFO(s, "SYSTEM INFO 5bis");
rand_check((uint8_t *)dtap, 18, &s->si5bis, s->cipher);
handle_sysinfo(s, dtap, len);
break;
case GSM48_MT_RR_SYSINFO_5ter:
SET_MSG_INFO(s, "SYSTEM INFO 5ter");
rand_check((uint8_t *)dtap, 18, &s->si5ter, s->cipher);
handle_sysinfo(s, dtap, len);
break;
case GSM48_MT_RR_SYSINFO_6:
SET_MSG_INFO(s, "SYSTEM INFO 6");
rand_check((uint8_t *)dtap, 18, &s->si6, s->cipher);
si6 = (struct gsm48_system_information_type_6 *) dtap;
handle_lai(s, (uint8_t*)&si6->lai, htons(si6->cell_identity));
handle_sysinfo(s, dtap, len);
break;
case GSM48_MT_RR_SYSINFO_13:
SET_MSG_INFO(s, "SYSTEM INFO 13");
handle_sysinfo(s, dtap, len);
break;
case GSM48_MT_RR_CHAN_REL:
SET_MSG_INFO(s, "CHANNEL RELEASE");
if (s->cipher && !s->fc.enc_rand)
s->fc.predict++;
s->release = 1;
s->rr_cause = dtap->data[0];
if ((len > 3) && ((dtap->data[1] & 0xf0) == 0xc0))
s->have_gprs = 1;
session_reset(&s[0], 0);
if (auto_reset) {
s[1].new_msg = NULL;
}
break;
case GSM48_MT_RR_CLSM_ENQ:
SET_MSG_INFO(s, "CLASSMARK ENQUIRY");
break;
case GSM48_MT_RR_MEAS_REP:
SET_MSG_INFO(s, "MEASUREMENT REPORT");
break;
case GSM48_MT_RR_CLSM_CHG:
SET_MSG_INFO(s, "CLASSMARK CHANGE");
handle_classmark(s, &dtap->data[1], 2);
break;
case GSM48_MT_RR_PAG_REQ_1:
SET_MSG_INFO(s, "PAGING REQ 1");
handle_paging1(dtap, len);
break;
case GSM48_MT_RR_PAG_REQ_2:
SET_MSG_INFO(s, "PAGING REQ 2");
handle_paging2(dtap, len);
break;
case GSM48_MT_RR_PAG_REQ_3:
SET_MSG_INFO(s, "PAGING REQ 3");
handle_paging3();
break;
case GSM48_MT_RR_IMM_ASS:
SET_MSG_INFO(s, "IMM ASSIGNMENT");
break;
case GSM48_MT_RR_IMM_ASS_EXT:
SET_MSG_INFO(s, "IMM ASSIGNMENT EXT");
break;
case GSM48_MT_RR_IMM_ASS_REJ:
SET_MSG_INFO(s, "IMM ASSIGNMENT REJECT");
break;
case GSM48_MT_RR_PAG_RESP:
session_reset(s, 1);
SET_MSG_INFO(s, "PAGING RESPONSE");
handle_pag_resp(s, dtap->data);
break;
case GSM48_MT_RR_HANDO_CMD:
SET_MSG_INFO(s, "HANDOVER COMMAND");
parse_assignment(dtap, len, s->cell_arfcns, &s->ga);
s->handover = 1;
s->use_jump = 2;
break;
case GSM48_MT_RR_HANDO_COMPL:
SET_MSG_INFO(s, "HANDOVER COMPLETE");
break;
case GSM48_MT_RR_ASS_CMD:
SET_MSG_INFO(s, "ASSIGNMENT COMMAND");
if ((s->fc.enc-s->fc.enc_null-s->fc.enc_si) == 1)
s->forced_ho = 1;
parse_assignment(dtap, len, s->cell_arfcns, &s->ga);
s->assignment = 1;
s->use_jump = 1;
break;
case GSM48_MT_RR_ASS_COMPL:
SET_MSG_INFO(s, "ASSIGNMENT COMPLETE");
s->assign_complete = 1;
break;
case GSM48_MT_RR_CIPH_M_COMPL:
SET_MSG_INFO(s, "CIPHER MODE COMPLETE");
if (s->cipher_missing < 0) {
s->cipher_missing = 0;
} else {
s->cipher_missing = 1;
}
if (!s->cm_comp_first_fn) {
if (fn) {
s->cm_comp_first_fn = fn;
} else {
s->cm_comp_first_fn = GSM_MAX_FN;
}
}
if (fn) {
s->cm_comp_last_fn = fn;
} else {
s->cm_comp_last_fn = GSM_MAX_FN;
}
s->cm_comp_count++;
if (dtap->data[0] == 0x2b)
return;
/* get IMEISV */
tlv_parse(&tp, &gsm48_rr_att_tlvdef, dtap->data, len-2, 0, 0);
if (TLVP_PRESENT(&tp, GSM48_IE_MOBILE_ID)) {
uint8_t *v = (uint8_t *) TLVP_VAL(&tp, GSM48_IE_MOBILE_ID);
handle_mi(s, &v[1], v[0], 0);
s->cmc_imeisv = 1;
}
break;
case GSM48_MT_RR_GPRS_SUSP_REQ:
SET_MSG_INFO(s, "GPRS SUSPEND");
s->have_gprs = 1;
//tlli
//rai (lai+rac)
break;
case GSM48_MT_RR_CIPH_M_CMD:
if (!s->cm_cmd_fn) {
if (fn) {
s->cm_cmd_fn = fn;
} else {
s->cm_cmd_fn = GSM_MAX_FN;
}
}
if (dtap->data[0] & 1) {
s->cipher = 1 + ((dtap->data[0]>>1) & 7);
if (!not_zero(s->key, 8))
s->decoded = 0;
}
SET_MSG_INFO(s, "CIPHER MODE COMMAND, A5/%u", s->cipher);
if (dtap->data[0] & 0x10) {
s->cmc_imeisv = 1;
if (s->cipher && !s->fc.enc_rand)
s->fc.predict++;
}
s->cipher_missing = -1;
break;
case 0x60:
SET_MSG_INFO(s, "UTRAN CLASSMARK");
break;
default:
SET_MSG_INFO(s, "UNKNOWN RR (%02x)", dtap->msg_type);
s->unknown = 1;
}
}
void handle_ss(struct session_info *s, struct gsm48_hdr *dtap, unsigned len)
{
assert(s != NULL);
assert(dtap != NULL);
if (!len) {
return;
}
s->ssa = 1;
switch (dtap->msg_type & 0x3f) {
case 0x2a:
SET_MSG_INFO(s, "SS RELEASE COMPLETE");
break;
case 0x3a:
SET_MSG_INFO(s, "SS FACILITY");
break;
case 0x3b:
SET_MSG_INFO(s, "SS REGISTER");
break;
default:
SET_MSG_INFO(s, "UNKNOWN SS (%02x)", dtap->msg_type & 0x3f);
s->unknown = 1;
}
}
void handle_attach_acc(struct session_info *s, uint8_t *data, unsigned len)
{
s->attach = 1;
s->att_acc = 1;
handle_lai(s, &data[3], data[8]);
if (data[13] == 0x18) {
handle_mi(s, &data[15], data[14], 1);
}
}
void handle_ra_upd_acc(struct session_info *s, uint8_t *data, unsigned len)
{
s->raupd = 1;
s->lu_acc = 1;
handle_lai(s, &data[2], data[7]);
if (data[8] == 0x18) {
handle_mi(s, &data[10], data[9], 1);
}
}
void handle_gmm(struct session_info *s, struct gsm48_hdr *dtap, unsigned len)
{
assert(s != NULL);
assert(dtap != NULL);
if (!len) {
return;
}
if (s->domain != DOMAIN_PS) {
SET_MSG_INFO(s, "FAILED SANITY CHECKS (GMM_IN_CS)");
return;
}
s->new_msg->domain = DOMAIN_PS;
switch (dtap->msg_type & 0x3f) {
case 0x01:
SET_MSG_INFO(s, "ATTACH REQUEST");
s->attach = 1;
s->started = 1;
s->closed = 0;
// get MS cap
// get key seq
// RAI
// MI
// extended cap
break;
case 0x02:
SET_MSG_INFO(s, "ATTACH ACCEPT");
handle_attach_acc(s, dtap->data, len-2);
break;
case 0x03:
SET_MSG_INFO(s, "ATTACH COMPLETE");
s->att_acc = 1;
break;
case 0x04:
SET_MSG_INFO(s, "ATTACH REJECT");
break;
case 0x05:
SET_MSG_INFO(s, "DETACH REQUEST");
s->started = 1;
break;
case 0x06:
SET_MSG_INFO(s, "DETACH ACCEPT");
break;
case 0x08:
SET_MSG_INFO(s, "RA UPDATE REQUEST");
session_reset(s, 1);
s->raupd = 1;
s->mo = 1;
s->started = 1;
s->closed = 0;
s->initial_seq = (dtap->data[0] >> 4) & 7;
break;
case 0x09:
SET_MSG_INFO(s, "RA UPDATE ACCEPT");
handle_ra_upd_acc(s, dtap->data, len-2);
break;
case 0x0a:
SET_MSG_INFO(s, "RA UPDATE COMPLETE");
s->raupd = 1;
break;
case 0x0b:
SET_MSG_INFO(s, "RA UPDATE REJECT");
break;
case 0x0c:
SET_MSG_INFO(s, "SERVICE REQUEST");
session_reset(s, 1);
s->started = 1;
s->closed = 0;
s->serv_req = 1;
handle_serv_req(s, dtap->data);
break;
case 0x0d:
SET_MSG_INFO(s, "SERVICE ACCEPT");
break;
case 0x0e:
SET_MSG_INFO(s, "SERVICE REJECT");
break;
case 0x10:
SET_MSG_INFO(s, "PTMSI REALLOC COMMAND");
break;
case 0x11:
SET_MSG_INFO(s, "PTMSI REALLOC COMPLETE");
break;
case 0x12:
SET_MSG_INFO(s, "AUTH AND CIPHER REQUEST");
s->auth = 1;
break;
case 0x13:
SET_MSG_INFO(s, "AUTH AND CIPHER RESPONSE");
s->auth = 1;
break;
case 0x14:
s->auth = 1;
SET_MSG_INFO(s, "AUTH AND CIPHER REJECT");
break;
case 0x15:
SET_MSG_INFO(s, "IDENTITY REQUEST");
break;
case 0x16:
SET_MSG_INFO(s, "IDENTITY RESPONSE");
break;
case 0x20:
SET_MSG_INFO(s, "GMM STATUS");
break;
case 0x21:
SET_MSG_INFO(s, "GMM INFORMATION");
break;
default:
SET_MSG_INFO(s, "UNKNOWN GMM (%02x)", dtap->msg_type & 0x3f);
}
}
void handle_sm(struct session_info *s, struct gsm48_hdr *dtap, unsigned len)
{
//uint8_t sapi;
//uint8_t qos_len;
assert(s != NULL);
assert(dtap != NULL);
if (!len) {
return;
}
if (s->domain != DOMAIN_PS) {
SET_MSG_INFO(s, "FAILED SANITY CHECKS (SM_IN_CS)");
return;
}
s->new_msg->domain = DOMAIN_PS;
switch (dtap->msg_type & 0x3f) {
case 0x01:
SET_MSG_INFO(s, "ACTIVATE PDP REQUEST");
s->pdp_activate = 1;
break;
case 0x02:
SET_MSG_INFO(s, "ACTIVATE PDP ACCEPT");
//sapi = dtap->data[0];
//qos_len = dtap->data[1];
//assert(qos_len < (len-3));
//TLV @ data[3+qos_len+1]
break;
case 0x06:
SET_MSG_INFO(s, "DEACTIVATE PDP REQUEST");
break;
case 0x07:
SET_MSG_INFO(s, "DEACTIVATE PDP ACCEPT");
break;
case 0x08:
SET_MSG_INFO(s, "MODIFY PDP REQUEST");
break;
case 0x09:
SET_MSG_INFO(s, "MODIFY PDP ACCEPT");
break;
case 0x0a:
SET_MSG_INFO(s, "DEACTIVATE PDP ACCEPT");
break;
case 0x15:
SET_MSG_INFO(s, "SM STATUS");
break;
default:
SET_MSG_INFO(s, "UNKNOWN SM (%02x)", dtap->msg_type & 0x3f);
}
}
void update_counters(struct session_info *s, uint8_t *data, unsigned len, unsigned data_len, uint32_t fn, uint8_t ul)
{
int is_random = 0;
struct frame_count *f = &s->fc;
unsigned pad_len;
uint8_t *pad_data;
if (ul)
s->uplink++;
pad_len = len - data_len;
pad_data = &data[data_len];
if (pad_len > 20) {
fprintf(stderr, "s = %d: error in pad_len %d\n", s->id, pad_len);
return;
}
//TODO: handle uplink statistics
if (ul)
return;
/* check padding randomization */
if (pad_len) {
switch (len) {
case 20: /* SDCCH */
if (data_len == 0) {
/* null frames */
is_random = rand_check(&pad_data[1], pad_len-1, &s->null, s->cipher);
} else {
/* other downlink */
is_random = rand_check(&pad_data[1], pad_len-1, &s->other_sdcch, s->cipher);
}
break;
case 18: /* SACCH */
is_random = rand_check(&pad_data[1], pad_len-1, &s->other_sacch, s->cipher);
break;
}
}
if (s->cipher) {
f->enc++;
if (is_random) {
f->enc_rand++;
}
if (!data_len) {
f->enc_null++;
if (is_random) {
f->enc_null_rand++;
} else {
f->predict++;
}
} else if (len == 18) {
f->enc_si++;
if (is_random)
f->enc_si_rand++;
else
f->predict++;
}
} else {
f->unenc++;
if (is_random) {
f->unenc_rand++;
}
}
}
int is_double(struct session_info *s, uint8_t *msg, size_t len)
{
int min_len;
uint8_t ul;
if (len > sizeof(s->last_dtap)) {
len = sizeof(s->last_dtap);
}
min_len = len > s->last_dtap_len ? s->last_dtap_len : len;
/* Match with previous msg, if available */
if (min_len && !memcmp(msg, s->last_dtap, min_len)) {
ul = !!(s->new_msg->bb.arfcn[0] & ARFCN_UPLINK);
if (ul) {
if ((s->last_dtap_rat == RAT_GSM) &&
(s->new_msg->rat != RAT_GSM)) {
// set real rat and discard
s->rat = s->new_msg->rat;
s->new_msg->flags &= ~MSG_DECODED;
return 1;
}
} else {
if ((s->last_dtap_rat != RAT_GSM) &&
(s->new_msg->rat == RAT_GSM)) {
// discard as we already processed the 3G one
s->new_msg->flags &= ~MSG_DECODED;
return 1;
}
}
}
/* store current */
memcpy(s->last_dtap, msg, len);
s->last_dtap_len = len;
s->last_dtap_rat = s->new_msg->rat;
return 0;
}
void handle_dtap(struct session_info *s, uint8_t *msg, size_t len, uint32_t fn, uint8_t ul)
{
struct gsm48_hdr *dtap;
assert(s != NULL);
assert(s->new_msg != NULL);
assert(msg != NULL);
dtap = (struct gsm48_hdr *) msg;
s->new_msg->info[0] = 0;
if (len == 0) {
SET_MSG_INFO(s, "<ZERO LENGTH>");
return;
}
if (is_double(s, msg, len)) {
SET_MSG_INFO(s, "<DOUBLE MSG>");
return;
}
switch (dtap->proto_discr & GSM48_PDISC_MASK) {
case GSM48_PDISC_CC:
handle_cc(s, dtap, len, ul);
break;
case GSM48_PDISC_MM:
handle_mm(s, dtap, len, fn);