diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/common/l1sap.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/src/common/l1sap.c b/src/common/l1sap.c index 4bf24a5d..97cbac19 100644 --- a/src/common/l1sap.c +++ b/src/common/l1sap.c @@ -317,6 +317,28 @@ static int gsmtap_ph_rach(struct osmo_phsap_prim *l1sap, uint8_t *chan_type, return 0; } +/* Paging Request 1 with "no identity" content, i.e. empty/dummy paging */ +static const uint8_t paging_fill[GSM_MACBLOCK_LEN] = { + 0x15, 0x06, 0x21, 0x00, 0x01, 0xf0, 0x2b, 0x2b, 0x2b, 0x2b, + 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, + 0x2b, 0x2b, 0x2b }; + +static bool is_fill_frame(uint8_t chan_type, const uint8_t *data, unsigned int len) +{ + switch (chan_type) { + case GSMTAP_CHANNEL_AGCH: + if (!memcmp(data, fill_frame, GSM_MACBLOCK_LEN)) + return true; + break; + case GSMTAP_CHANNEL_PCH: + if (!memcmp(data, paging_fill, GSM_MACBLOCK_LEN)) + return true; + break; + default: + return false; + } +} + static int to_gsmtap(struct gsm_bts_trx *trx, struct osmo_phsap_prim *l1sap) { uint8_t *data; @@ -364,6 +386,11 @@ static int to_gsmtap(struct gsm_bts_trx *trx, struct osmo_phsap_prim *l1sap) return 0; } + /* don't log fill frames via GSMTAP; they serve no purpose other than + * to clog up your logs */ + if (is_fill_frame(chan_type, data, len)) + return 0; + gsmtap_send(gsmtap, trx->arfcn | uplink, tn, chan_type, ss, fn, 0, 0, data, len); |