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osmo-pcu
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Use seperate function to parse IMSI from BSSGP message

This commit is contained in:
Andreas Eversberg 2012-10-08 12:25:55 +02:00
parent afdd9e1be5
commit 00950743d7
1 changed files with 31 additions and 20 deletions
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51
src/gprs_bssgp_pcu.cpp
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@ -32,6 +32,35 @@ struct osmo_timer_list bvc_timer;
static void bvc_timeout(void *_priv);
static int parse_imsi(struct tlv_parsed *tp, char *imsi)
{
uint8_t imsi_len;
uint8_t *bcd_imsi;
int i, j;
if (!TLVP_PRESENT(tp, BSSGP_IE_IMSI))
return -EINVAL;
imsi_len = TLVP_LEN(tp, BSSGP_IE_IMSI);
bcd_imsi = (uint8_t *) TLVP_VAL(tp, BSSGP_IE_IMSI);
if ((bcd_imsi[0] & 0x08))
imsi_len = imsi_len * 2 - 1;
else
imsi_len = (imsi_len - 1) * 2;
for (i = 0, j = 0; j < imsi_len && j < 15; j++)
{
if (!(j & 1)) {
imsi[j] = (bcd_imsi[i] >> 4) + '0';
i++;
} else
imsi[j] = (bcd_imsi[i] & 0xf) + '0';
}
imsi[j] = '\0';
return 0;
}
int gprs_bssgp_pcu_rx_dl_ud(struct msgb *msg, struct tlv_parsed *tp)
{
struct bssgp_ud_hdr *budh;
@ -39,10 +68,10 @@ int gprs_bssgp_pcu_rx_dl_ud(struct msgb *msg, struct tlv_parsed *tp)
int8_t tfi; /* must be signed */
uint32_t tlli;
int i, j;
uint8_t *data;
uint16_t len;
struct gprs_rlcmac_tbf *tbf;
char imsi[16] = "000";
budh = (struct bssgp_ud_hdr *)msgb_bssgph(msg);
tlli = ntohl(budh->tlli);
@ -65,25 +94,7 @@ int gprs_bssgp_pcu_rx_dl_ud(struct msgb *msg, struct tlv_parsed *tp)
/* read IMSI. if no IMSI exists, use first paging block (any paging),
* because during attachment the IMSI might not be known, so the MS
* will listen to all paging blocks. */
char imsi[16] = "000";
if (TLVP_PRESENT(tp, BSSGP_IE_IMSI))
{
uint8_t imsi_len = TLVP_LEN(tp, BSSGP_IE_IMSI);
uint8_t *bcd_imsi = (uint8_t *) TLVP_VAL(tp, BSSGP_IE_IMSI);
if ((bcd_imsi[0] & 0x08))
imsi_len = imsi_len * 2 - 1;
else
imsi_len = (imsi_len - 1) * 2;
for (i = 0, j = 0; j < imsi_len && j < 16; j++)
{
if (!(j & 1)) {
imsi[j] = (bcd_imsi[i] >> 4) + '0';
i++;
} else
imsi[j] = (bcd_imsi[i] & 0xf) + '0';
}
imsi[j] = '\0';
}
parse_imsi(tp, imsi);
/* parse ms radio access capability */
uint8_t ms_class = 0;