diff options
Diffstat (limited to 'openbsc/src/libiu')
| -rw-r--r-- | openbsc/src/libiu/iu.c | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/openbsc/src/libiu/iu.c b/openbsc/src/libiu/iu.c index dcc281adb..b3e489dc1 100644 --- a/openbsc/src/libiu/iu.c +++ b/openbsc/src/libiu/iu.c @@ -3,6 +3,7 @@ #include <stdlib.h> #include <stdio.h> #include <string.h> +#include <stdbool.h> #include <osmocom/core/select.h> #include <osmocom/core/prim.h> @@ -16,6 +17,7 @@ #include <osmocom/sigtran/sua.h> #include <osmocom/sigtran/sccp_sap.h> +#include <osmocom/sigtran/sccp_helpers.h> #include <openbsc/gprs_sgsn.h> #include <openbsc/iu.h> @@ -536,6 +538,83 @@ static void cn_ranap_handle_cl(void *ctx, ranap_message *message) } /*********************************************************************** + * Paging + ***********************************************************************/ + +/* Send a paging command down a given SUA link. tmsi and paging_cause are + * optional and may be passed NULL and 0, respectively, to disable their use. + * See enum RANAP_PagingCause. + * + * If TMSI is given, the IMSI is not sent over the air interface. Nevertheless, + * the IMSI is still required for resolution in the HNB-GW and/or(?) RNC. */ +static int iu_tx_paging_cmd(struct osmo_sua_link *link, + const char *imsi, const uint32_t *tmsi, + bool is_ps, uint32_t paging_cause) +{ + struct msgb *msg; + msg = ranap_new_msg_paging_cmd(imsi, tmsi, is_ps? 1 : 0, paging_cause); + msg->l2h = msg->data; + return osmo_sccp_tx_unitdata_ranap(link, 1, 2, msg->data, + msgb_length(msg)); +} + +static int iu_page(const char *imsi, const uint32_t *tmsi_or_ptimsi, + uint16_t lac, uint8_t rac, bool is_ps) +{ + struct iu_rnc *rnc; + int pagings_sent = 0; + + llist_for_each_entry(rnc, &rnc_list, entry) { + if (!rnc->link) { + /* Not actually connected, don't count it. */ + continue; + } + if (rnc->lac != lac) + continue; + if (is_ps && rnc->rac != rac) + continue; + + /* Found a match! */ + if (iu_tx_paging_cmd(rnc->link, imsi, tmsi_or_ptimsi, is_ps, 0) + == 0) + pagings_sent ++; + } + + /* Some logging... */ + if (pagings_sent > 0) { + LOGP(DRANAP, LOGL_DEBUG, + "%s: %d RNCs were paged for IMSI %s.\n", + is_ps? "IuPS" : "IuCS", + pagings_sent, imsi); + } + else { + if (is_ps) { + LOGP(DRANAP, LOGL_ERROR, "IuPS: Found no RNC to page for" + " LAC %d RAC %d (would have paged IMSI %s)\n", + lac, rac, imsi); + } + else { + LOGP(DRANAP, LOGL_ERROR, "IuCS: Found no RNC to page for" + " LAC %d (would have paged IMSI %s)\n", + lac, imsi); + } + } + + return pagings_sent; +} + +int iu_page_cs(const char *imsi, const uint32_t *tmsi, uint16_t lac) +{ + return iu_page(imsi, tmsi, lac, 0, false); +} + +int iu_page_ps(const char *imsi, const uint32_t *ptmsi, uint16_t lac, uint8_t rac) +{ + return iu_page(imsi, ptmsi, lac, rac, true); +} + + +/*********************************************************************** * ***********************************************************************/ |