diff options
| author | Harald Welte <laforge@gnumonks.org> | 2010-12-26 10:39:26 +0100 |
|---|---|---|
| committer | Harald Welte <laforge@gnumonks.org> | 2011-01-01 17:28:29 +0100 |
| commit | f0901f0067e363c0ced6254db1b45a9771640412 (patch) | |
| tree | bc0222cf1438c15a6d9cc43199d79293afa6dec9 /openbsc/src/gprs/gprs_llc.c | |
| parent | 91c59c8cb5afe2d8eba194d5dd1de19323b71878 (diff) | |
[SGSN] Fix processing of RA Update Request regarding TLLI
In case we get a RA UPD REQ on a new cell (both served by the same
SGSN), the LLC stack should not allocate a ne LLE/LLME, as the latter
would reset the V(u)sent / V(u)recv to zero and make the MS discard
our responses.
Instead, whenever the LLC stack sees a foreign TLLI, it should always
convert it to the local TLLI before doing any lookup for a LLE/LLME.
Diffstat (limited to 'openbsc/src/gprs/gprs_llc.c')
| -rw-r--r-- | openbsc/src/gprs/gprs_llc.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/openbsc/src/gprs/gprs_llc.c b/openbsc/src/gprs/gprs_llc.c index 002742bee..7991f4c1e 100644 --- a/openbsc/src/gprs/gprs_llc.c +++ b/openbsc/src/gprs/gprs_llc.c @@ -106,11 +106,28 @@ static const struct gprs_llc_params llc_default_params[] = { LLIST_HEAD(gprs_llc_llmes); void *llc_tall_ctx; +/* If the TLLI is foreign, return its local version */ +static inline uint32_t tlli_foreign2local(uint32_t tlli) +{ + uint32_t new_tlli; + + if (gprs_tlli_type(tlli) == TLLI_FOREIGN) { + new_tlli = tlli | 0x40000000; + DEBUGP(DLLC, "TLLI 0x%08x is foreign, converting to " + "local TLLI 0x%08x\n", tlli, new_tlli); + } else + new_tlli = tlli; + + return new_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) { 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]; @@ -321,6 +338,8 @@ int gprs_llc_tx_ui(struct msgb *msg, uint8_t sapi, int command, lle = lle_by_tlli_sapi(msgb_tlli(msg), sapi); if (!lle) { struct gprs_llc_llme *llme; + LOGP(DLLC, LOGL_ERROR, "LLC TX: unknown TLLI 0x%08x, " + "creating LLME on the fly\n", msgb_tlli(msg)); llme = llme_alloc(msgb_tlli(msg)); lle = &llme->lle[sapi]; } @@ -677,6 +696,8 @@ int gprs_llc_rcvmsg(struct msgb *msg, struct tlv_parsed *tv) struct gprs_llc_llme *llme; /* FIXME: don't use the TLLI but the 0xFFFF unassigned? */ llme = llme_alloc(msgb_tlli(msg)); + LOGP(DLLC, LOGL_DEBUG, "LLC RX: unknown TLLI 0x08x, " + "creating LLME on the fly\n", msgb_tlli(msg)); lle = &llme->lle[llhp.sapi]; } else { LOGP(DLLC, LOGL_NOTICE, |