diff options
Diffstat (limited to 'src/gprs/gprs_llc.c')
| -rw-r--r-- | src/gprs/gprs_llc.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/src/gprs/gprs_llc.c b/src/gprs/gprs_llc.c index 654f2c0d8..2ec7100b2 100644 --- a/src/gprs/gprs_llc.c +++ b/src/gprs/gprs_llc.c @@ -44,6 +44,7 @@ static struct gprs_llc_llme *llme_alloc(uint32_t tlli); static int gprs_llc_tx_xid(struct gprs_llc_lle *lle, struct msgb *msg, int command); +static int gprs_llc_tx_dm(struct gprs_llc_lle *lle); static int gprs_llc_tx_u(struct msgb *msg, uint8_t sapi, int command, enum gprs_llc_u_cmd u_cmd, int pf_bit); @@ -676,6 +677,18 @@ static int gprs_llc_tx_xid(struct gprs_llc_lle *lle, struct msgb *msg, return gprs_llc_tx_u(msg, lle->sapi, command, GPRS_LLC_U_XID, 1); } +static int gprs_llc_tx_dm(struct gprs_llc_lle *lle) +{ + struct msgb *msg = msgb_alloc_headroom(4096, 1024, "LLC_DM"); + + /* copy identifiers from LLE to ensure lower layers can route */ + msgb_tlli(msg) = lle->llme->tlli; + msgb_bvci(msg) = lle->llme->bvci; + msgb_nsei(msg) = lle->llme->nsei; + + return gprs_llc_tx_u(msg, lle->sapi, 0, GPRS_LLC_U_DM_RESP, 1); +} + /* encrypt information field + FCS, if needed! */ static int apply_gea(struct gprs_llc_lle *lle, uint16_t crypt_len, uint16_t nu, uint32_t oc, uint8_t sapi, uint8_t *fcs, uint8_t *data) @@ -802,6 +815,8 @@ static int gprs_llc_hdr_rx(struct gprs_llc_hdr_parsed *gph, struct gprs_llc_lle *lle) { switch (gph->cmd) { +#if 0 + /* we don't fully imoplement ABM, so refuse it properly (OS#3953) */ case GPRS_LLC_SABM: /* Section 6.4.1.1 */ lle->v_sent = lle->v_ack = lle->v_recv = 0; if (lle->state == GPRS_LLES_ASSIGNED_ADM) { @@ -827,6 +842,13 @@ static int gprs_llc_hdr_rx(struct gprs_llc_hdr_parsed *gph, break; case GPRS_LLC_FRMR: /* Section 6.4.1.5 */ break; +#else + case GPRS_LLC_SABM: + case GPRS_LLC_DISC: + /* send DM to properly signal we don't do ABM */ + gprs_llc_tx_dm(lle); + break; +#endif case GPRS_LLC_XID: /* Section 6.4.1.6 */ rx_llc_xid(lle, gph); break; |