[M] Change in osmo-mgw[master]: mgw: Split MDCX read-only validation on conn into its own function

pespin has uploaded this change for review. ( https://gerrit.osmocom.org/c/osmo-mgw/+/39739?usp=email ) Change subject: mgw: Split MDCX read-only validation on conn into its own function ...................................................................... mgw: Split MDCX read-only validation on conn into its own function Add a second read-only validation step once the conn to be modified is found in the endpoint. Change-Id: I025ca5352eff9ee35c977c69b71934513646b1f2 --- M src/libosmo-mgcp/mgcp_protocol.c 1 file changed, 40 insertions(+), 14 deletions(-) git pull ssh://gerrit.osmocom.org:29418/osmo-mgw refs/changes/39/39739/1 diff --git a/src/libosmo-mgcp/mgcp_protocol.c b/src/libosmo-mgcp/mgcp_protocol.c index 79a647a..6a731a3 100644 --- a/src/libosmo-mgcp/mgcp_protocol.c +++ b/src/libosmo-mgcp/mgcp_protocol.c @@ -891,6 +891,37 @@ return 0; } +/* Read-only checks for parsed MDCX request, applied to existing found conn. + * Returns negative MGCP error code on failure, 0 on scucess. */ +static int validate_parsed_mdcx_conn(struct mgcp_request_data *rq, struct mgcp_conn *conn) +{ + struct mgcp_parse_data *pdata = rq->pdata; + struct mgcp_parse_hdr_pars *hpars = &pdata->hpars; + struct mgcp_conn_rtp *conn_rtp = mgcp_conn_get_conn_rtp(conn); + + OSMO_ASSERT(conn_rtp); + + if (mgcp_conn_rtp_is_osmux(conn_rtp)) { + OSMO_ASSERT(conn_rtp->osmux.local_cid_allocated); + if (hpars->remote_osmux_cid == MGCP_PARSE_HDR_PARS_OSMUX_CID_UNSET) { + LOGPCONN(conn, DLMGCP, LOGL_ERROR, "MDCX: Failed to parse Osmux CID!\n"); + return -500; + } + if (hpars->remote_osmux_cid == MGCP_PARSE_HDR_PARS_OSMUX_CID_WILDCARD) { + LOGPCONN(conn, DLMGCP, LOGL_ERROR, "MDCX: wilcard in MDCX is not supported!\n"); + return -500; + } + if (conn_rtp->osmux.remote_cid_present && + hpars->remote_osmux_cid != conn_rtp->osmux.remote_cid) { + LOGPCONN(conn, DLMGCP, LOGL_ERROR, "MDCX: changing already allocated CID is not supported!\n"); + return -500; + } + } + + /* Everything fine, continue */ + return 0; +} + /* MDCX command handler, processes the received command */ static struct msgb *handle_modify_con(struct mgcp_request_data *rq) { @@ -953,6 +984,15 @@ return create_err_response(endp, endp, 400, "MDCX", pdata->trans); } + rc = validate_parsed_mdcx_conn(rq, conn); + if (rc < 0) + return create_err_response(rq->trunk, NULL, -rc, "MDCX", pdata->trans); + + /******************************************************************* + * Modify endpoint and conn. + * From here on below we start updating endpoint and modifying conn: + *******************************************************************/ + /* Set local connection options, if present */ if (hpars->lco.present) mgcp_endp_update_lco(endp, &hpars->lco); @@ -983,20 +1023,6 @@ rc = mgcp_conn_iuup_init(conn_rtp); if (mgcp_conn_rtp_is_osmux(conn_rtp)) { - OSMO_ASSERT(conn_rtp->osmux.local_cid_allocated); - if (hpars->remote_osmux_cid < -1) { - LOGPCONN(conn, DLMGCP, LOGL_ERROR, "MDCX: Failed to parse Osmux CID!\n"); - goto error3; - } - if (hpars->remote_osmux_cid == -1) { - LOGPCONN(conn, DLMGCP, LOGL_ERROR, "MDCX: wilcard in MDCX is not supported!\n"); - goto error3; - } - if (conn_rtp->osmux.remote_cid_present && - hpars->remote_osmux_cid != conn_rtp->osmux.remote_cid) { - LOGPCONN(conn, DLMGCP, LOGL_ERROR, "MDCX: changing already allocated CID is not supported!\n"); - goto error3; - } conn_rtp->osmux.remote_cid_present = true; conn_rtp->osmux.remote_cid = hpars->remote_osmux_cid; if (conn_osmux_event_rx_crcx_mdcx(conn_rtp) < 0) { -- To view, visit https://gerrit.osmocom.org/c/osmo-mgw/+/39739?usp=email To unsubscribe, or for help writing mail filters, visit https://gerrit.osmocom.org/settings?usp=email Gerrit-MessageType: newchange Gerrit-Project: osmo-mgw Gerrit-Branch: master Gerrit-Change-Id: I025ca5352eff9ee35c977c69b71934513646b1f2 Gerrit-Change-Number: 39739 Gerrit-PatchSet: 1 Gerrit-Owner: pespin &lt;pespin(a)sysmocom.de&gt;