int gprs_gb_parse_llc(uint8_t *llc, size_t llc_len,
struct gprs_gb_parse_context *parse_ctx)
{
struct gprs_llc_hdr_parsed *ghp = &parse_ctx->llc_hdr_parsed;
int rc;
int fcs;
/* parse LLC */
rc = gprs_llc_hdr_parse(ghp, llc, llc_len);
gprs_llc_hdr_dump(ghp);
if (rc != 0) {
LOGP(DLLC, LOGL_NOTICE, "Error during LLC header parsing\n");
return 0;
}
fcs = gprs_llc_fcs(llc, ghp->crc_length);
LOGP(DLLC, LOGL_DEBUG, "Got LLC message, CRC: %06x (computed %06x)\n",
ghp->fcs, fcs);
if (!ghp->data)
return 0;
if (ghp->sapi != GPRS_SAPI_GMM)
return 1;
if (ghp->cmd != GPRS_LLC_UI)
return 1;
if (ghp->is_encrypted) {
parse_ctx->need_decryption = 1;
return 0;
}
return gprs_gb_parse_dtap(ghp->data, ghp->data_len, parse_ctx);
}
void test_replay_gprs_data(struct gprs_bssgp_pcu *pcu, struct msgb *msg, struct tlv_parsed *tp)
{
struct bssgp_ud_hdr *budh;
struct gprs_llc_hdr_parsed ph;
uint32_t tlli;
if (!TLVP_PRESENT(tp, BSSGP_IE_LLC_PDU))
return;
gprs_llc_hdr_parse(&ph, TLVP_VAL(tp, BSSGP_IE_LLC_PDU),
TLVP_LEN(tp, BSSGP_IE_LLC_PDU));
budh = (struct bssgp_ud_hdr *)msgb_bssgph(msg);
tlli = ntohl(budh->tlli);
/* all messages we should get, should be for a foreign tlli */
OSMO_ASSERT(gprs_tlli_type(tlli) == TLLI_FOREIGN);
printf("TLLI(0x%08x) is foreign!\n", tlli);
OSMO_ASSERT(ph.cmd == GPRS_LLC_UI);
OSMO_ASSERT(ph.sapi == 1);
OSMO_ASSERT(ph.seq_tx == next_wanted_nu++);
/* this test just wants to see messages... no further data is sent */
if (next_wanted_nu == 6) {
printf("GPRS attach with increasing N(U) done.\n");
gprs_test_success(pcu);
}
}