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osmo-bts
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update the HACK to delay the fake CIPHERING MODE COMPLETE 

When seinding the fake CIPH MOD COMPL, we should wait a bit, as otherwise it
will reach the MSC _before_ we ever get the (still unencrypted) CLASSMARK
update from the MS.
This commit is contained in:
Harald Welte 2011-07-12 00:23:32 +02:00
parent 0285067b63
commit 168238f9de
1 changed files with 38 additions and 9 deletions
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47
src/common/rsl.c
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@ -26,6 +26,7 @@
#include <arpa/inet.h>
#include <osmocom/core/msgb.h>
#include <osmocom/core/talloc.h>
#include <osmocom/gsm/rsl.h>
#include <osmocom/gsm/lapdm.h>
#include <osmocom/gsm/protocol/gsm_12_21.h>
@ -683,8 +684,34 @@ static int tx_ciph_mod_compl_hack(struct gsm_lchan *lchan, uint8_t link_id,
/* send it back to the BTS */
return abis_rsl_sendmsg(fake_msg);
}
struct ciph_mod_compl {
struct osmo_timer_list timer;
struct gsm_lchan *lchan;
int send_imeisv;
uint8_t link_id;
};
static void cmc_timer_cb(void *data)
{
struct ciph_mod_compl *cmc = data;
const char *imeisv = NULL;
LOGP(DRSL, LOGL_NOTICE,
"%s Sending FAKE CIPHERING MODE COMPLETE to BSC (Alg %u)\n",
gsm_lchan_name(cmc->lchan), cmc->lchan->encr.alg_id);
if (cmc->send_imeisv)
imeisv = "0123456789012345";
/* We have no clue whatsoever that this lchan still exists! */
tx_ciph_mod_compl_hack(cmc->lchan, cmc->link_id, imeisv);
talloc_free(cmc);
}
#endif
/* 8.4.6 ENCRYPTION COMMAND */
static int rsl_rx_encr_cmd(struct msgb *msg)
{
@ -725,17 +752,19 @@ static int rsl_rx_encr_cmd(struct msgb *msg)
#ifdef FAKE_CIPH_MODE_COMPL
{
struct gsm48_hdr *g48h = (struct gsm48_hdr *) l3_content;
const char *imeisv = NULL;
struct ciph_mod_compl *cmc;
struct gsm48_hdr *g48h = (struct gsm48_hdr *) l3_content;
LOGP(DRSL, LOGL_NOTICE,
"%s Sending FAKE CIPHERING MODE COMPLETE to BSC (Alg %u)\n",
gsm_lchan_name(lchan), lchan->encr.alg_id);
cmc = talloc_zero(NULL, struct ciph_mod_compl);
if (g48h->data[0] & 0x10)
cmc->send_imeisv = 1;
cmc->lchan = lchan;
cmc->link_id = link_id;
cmc->timer.cb = cmc_timer_cb;
cmc->timer.data = cmc;
osmo_timer_schedule(&cmc->timer, 1, 0);
if (g48h->data[0] & 0x10)
imeisv = "0123456789012345";
return tx_ciph_mod_compl_hack(lchan, link_id, imeisv);
return 0;
}
#else
LOGP(DRSL, LOGL_INFO, "%s Fwd RSL ENCR CMD (Alg %u) to LAPDm\n",