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libosmo-sccp
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sccp: more SCMG handling: SSA and SSP message handling 

When a SSP (Subsystem Prohibited) or SSA (Subsystem Available) SCMG
message is received, we must generate the respective primitives towards
the SCCP user.

Change-Id: I149166a25113f5d3e3536f9297bf89ff3139b9e3
This commit is contained in:
Harald Welte 2021-02-07 18:05:38 +01:00
parent 0d53666108
commit 7daae9bd67
1 changed files with 31 additions and 2 deletions
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33
src/sccp_scmg.c
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@ -167,6 +167,33 @@ static int sccp_scmg_tx(struct osmo_sccp_user *scu, const struct osmo_sccp_addr
}
/* Subsystem Allowed received */
static int scmg_rx_ssa(struct osmo_sccp_user *scu, const struct osmo_sccp_addr *calling_addr,
const struct osmo_sccp_addr *called_addr, const struct sccp_scmg_msg *ssa)
{
/* Q.714 5.3.3 */
if (ssa->affected_ssn == SCCP_SSN_MANAGEMENT)
return 0;
/* if the SSN is not marked as prohibited, ignore */
/* Q.714 5.3.2.2 a) */
sccp_scmg_rx_ssn_allowed(scu->inst, ssa->affected_pc, ssa->affected_ssn, ssa->smi);
/* If the remote SCCP, at which the subsystem reported in the SSA message resides, is marked
* inaccessible, then the message is treated as an implicit indication of SCCP restart */
return 0;
}
/* Subsystem Prohibited received */
static int scmg_rx_ssp(struct osmo_sccp_user *scu, const struct osmo_sccp_addr *calling_addr,
const struct osmo_sccp_addr *called_addr, const struct sccp_scmg_msg *ssp)
{
/* Q.714 5.3.2.2 a) */
sccp_scmg_rx_ssn_prohibited(scu->inst, ssp->affected_pc, ssp->affected_ssn, ssp->smi);
return 0;
}
/* Subsystem Test received */
static int scmg_rx_sst(struct osmo_sccp_user *scu, const struct osmo_sccp_addr *calling_addr,
const struct osmo_sccp_addr *called_addr, const struct sccp_scmg_msg *sst)
@ -191,10 +218,12 @@ static int scmg_rx(struct osmo_sccp_user *scu, const struct osmo_sccp_addr *call
const struct osmo_sccp_addr *called_addr, const struct sccp_scmg_msg *scmg)
{
switch (scmg->msg_type) {
case SCCP_SCMG_MSGT_SSA:
return scmg_rx_ssa(scu, calling_addr, called_addr, scmg);
case SCCP_SCMG_MSGT_SSP:
return scmg_rx_ssp(scu, calling_addr, called_addr, scmg);
case SCCP_SCMG_MSGT_SST:
return scmg_rx_sst(scu, calling_addr, called_addr, scmg);
case SCCP_SCMG_MSGT_SSP:
case SCCP_SCMG_MSGT_SSA:
case SCCP_SCMG_MSGT_SOR:
case SCCP_SCMG_MSGT_SOG:
case SCCP_SCMG_MSGT_SSC: