[GPRS] NS: Don't hand Frame Relay LMI packets into the NS code
diff --git a/openbsc/src/gprs/gprs_ns_frgre.c b/openbsc/src/gprs/gprs_ns_frgre.c
index e22b0c7..326bd70 100644
--- a/openbsc/src/gprs/gprs_ns_frgre.c
+++ b/openbsc/src/gprs/gprs_ns_frgre.c
@@ -206,19 +206,29 @@
static int handle_nsfrgre_read(struct bsc_fd *bfd)
{
- int error;
+ int rc;
struct sockaddr_in saddr;
struct gprs_ns_inst *nsi = bfd->data;
- struct msgb *msg = read_nsfrgre_msg(bfd, &error, &saddr);
+ struct msgb *msg;
+ uint16_t dlci;
+ msg = read_nsfrgre_msg(bfd, &rc, &saddr);
if (!msg)
- return error;
+ return rc;
- error = gprs_ns_rcvmsg(nsi, msg, &saddr, GPRS_NS_LL_FR_GRE);
+ dlci = ntohs(saddr.sin_port);
+ if (dlci == 0 || dlci == 1023) {
+ LOGP(DNS, LOGL_INFO, "Received FR on LMI DLCI %u - ignoring\n",
+ dlci);
+ rc = 0;
+ goto out;
+ }
+ rc = gprs_ns_rcvmsg(nsi, msg, &saddr, GPRS_NS_LL_FR_GRE);
+out:
msgb_free(msg);
- return error;
+ return rc;
}
static int handle_nsfrgre_write(struct bsc_fd *bfd)