diff options
authorHolger Hans Peter Freyther <>2013-07-29 09:06:46 +0200
committerHolger Hans Peter Freyther <>2013-07-31 14:57:21 +0200
commit012a7eec2903444765e7a005850665c98868aa21 (patch)
parent598e7b3cdf2d5b40ddb0081df72b413139cf0b71 (diff)
gprs_llc: Lookup lle based on the real TLLI
During the GPRS Attach procedure we might have a foreign tlli and in the RX create a LLME on the fly for this tlli. The GMM GPRS Attach handling code will then assign a new TLLI and keep the foreign tlli as the llme->old_tlli. When the GMM is sending the identity request the msgb_tlli will point to the foreign tlli. The GPRS LLC code will then try to find that foreign tlli but due the conversion this will not be found. Instead a new ad-hoc LLE/LLME will be created on the fly for each message (this means there are duplicate LLE/LLMEs in the list). Make the code more strict and remove the tlli_foreign2local change from the look-up routine. This will make the GPRS LLC code find the right LLE/LLME and the N(U) will be handled correctly. This partially reverts: f0901f0067e363c0ced6254db1b45a9771640412 Addresses: <0012> gprs_llc.c:773 LLC RX: unknown TLLI 0xadf11820, creating LLME on the fly ... <0012> gprs_llc.c:357 LLC TX: unknown TLLI 0xedf11820, creating LLME on the fly Reproducable: Use pcu_emu (gprs attach) and observe with wireshark.
1 files changed, 1 insertions, 3 deletions
diff --git a/openbsc/src/gprs/gprs_llc.c b/openbsc/src/gprs/gprs_llc.c
index 8af5367e4..57e557ae3 100644
--- a/openbsc/src/gprs/gprs_llc.c
+++ b/openbsc/src/gprs/gprs_llc.c
@@ -147,12 +147,10 @@ static inline uint32_t tlli_foreign2local(uint32_t tlli)
/* lookup LLC Entity based on DLCI (TLLI+SAPI tuple) */
-static struct gprs_llc_lle *lle_by_tlli_sapi(uint32_t tlli, uint8_t sapi)
+static struct gprs_llc_lle *lle_by_tlli_sapi(const uint32_t tlli, uint8_t sapi)
struct gprs_llc_llme *llme;
- tlli = tlli_foreign2local(tlli);
llist_for_each_entry(llme, &gprs_llc_llmes, list) {
if (llme->tlli == tlli || llme->old_tlli == tlli)
return &llme->lle[sapi];