[GPRS] Implement TMSI reallocation and timers 3350 + 3370
Our state transitions and timers now reflect 04.08 for GMM much
better than before. Also, we allocate a new P-TMSI on every ATTACH
and RA UPDATE, as some phones seem to get confused if they don't
get a P-TMSI.
diff --git a/openbsc/src/gprs/gprs_sgsn.c b/openbsc/src/gprs/gprs_sgsn.c
index 0e87e62..bab34d8 100644
--- a/openbsc/src/gprs/gprs_sgsn.c
+++ b/openbsc/src/gprs/gprs_sgsn.c
@@ -84,7 +84,8 @@
tlli_type = gprs_tlli_type(tlli);
if (tlli_type == TLLI_LOCAL) {
llist_for_each_entry(ctx, &sgsn_mm_ctxts, list) {
- if ((ctx->p_tmsi | 0xC0000000) == tlli) {
+ if ((ctx->p_tmsi | 0xC0000000) == tlli ||
+ (ctx->p_tmsi_old && (ctx->p_tmsi_old | 0xC0000000) == tlli)) {
ctx->tlli = tlli;
return ctx;
}
@@ -99,7 +100,8 @@
struct sgsn_mm_ctx *ctx;
llist_for_each_entry(ctx, &sgsn_mm_ctxts, list) {
- if (p_tmsi == ctx->p_tmsi)
+ if (p_tmsi == ctx->p_tmsi ||
+ (ctx->p_tmsi_old && ctx->p_tmsi_old == p_tmsi))
return ctx;
}
return NULL;