osmith has submitted this change. ( https://gerrit.osmocom.org/c/osmo-bsc-nat/+/27704 )

Change subject: bssap: forward paging from MSC to all BSCs ......................................................................

bssap: forward paging from MSC to all BSCs

I've considered only forwarding to specific BSCs based on the cell identifier list inside the paging. For that, the cell identifier would need to be stored beforehand (read it from location update? or put it in vty config?) and I'm not sure if it is required, so don't do this for now and extend it later if needed.

Related: SYS#5560 Related: https://osmocom.org/projects/osmo-bscnat/wiki/AoIP_OsmoBSCNAT#PAGING-BSC Change-Id: I2532d94aab82d136b932d57fa53c8ecf2d8d1fd9 --- M src/osmo-bsc-nat/bssap.c 1 file changed, 38 insertions(+), 0 deletions(-)

Approvals: Jenkins Builder: Verified pespin: Looks good to me, but someone else must approve fixeria: Looks good to me, but someone else must approve laforge: Looks good to me, but someone else must approve osmith: Looks good to me, approved

diff --git a/src/osmo-bsc-nat/bssap.c b/src/osmo-bsc-nat/bssap.c index 94a450a..8e73a50 100644 --- a/src/osmo-bsc-nat/bssap.c +++ b/src/osmo-bsc-nat/bssap.c @@ -38,6 +38,41 @@ return osmo_sccp_tx_unitdata_msg(sccp_inst->scu, &sccp_inst->addr, addr, msg); }

+static int bssmap_cn_handle_paging(struct osmo_sccp_addr *addr, struct msgb *msg, unsigned int length) +{ + struct bsc_nat_sccp_inst *sccp_inst = g_bsc_nat->ran.sccp_inst; + struct msc *msc = msc_get(); + struct bsc *bsc; + int ret = 0; + int rc; + + if (msc->addr.pc != addr->pc) { + LOGP(DMAIN, LOGL_ERROR, "Unexpected Rx PAGING in CN from %s, which is not %s\n", + osmo_ss7_pointcode_print(NULL, addr->pc), talloc_get_name(msc)); + return -1; + } + + LOGP(DMAIN, LOGL_DEBUG, "Rx PAGING from %s\n", talloc_get_name(msc)); + + msgb_pull_to_l2(msg); + + /* Page all BSCs */ + llist_for_each_entry(bsc, &g_bsc_nat->ran.bscs, list) { + LOGP(DMAIN, LOGL_DEBUG, "Fwd to %s\n", talloc_get_name(bsc)); + rc = osmo_sccp_tx_unitdata(sccp_inst->scu, + &sccp_inst->addr, + &bsc->addr, + msg->data, + msgb_length(msg)); + if (rc < 0) { + LOGP(DMAIN, LOGL_ERROR, "Fwd to %s failed\n", talloc_get_name(bsc)); + ret = rc; + } + } + + return ret; +} + static int bssmap_cn_handle_reset_ack(struct osmo_sccp_addr *addr, struct msgb *msg, unsigned int length) { struct msc *msc = msc_get(); @@ -59,6 +94,9 @@ int ret = 0;

switch (msg->l3h[0]) { + case BSS_MAP_MSG_PAGING: + ret = bssmap_cn_handle_paging(addr, msg, length); + break; case BSS_MAP_MSG_RESET_ACKNOWLEDGE: ret = bssmap_cn_handle_reset_ack(addr, msg, length); break;