neels has uploaded this change for review. ( https://gerrit.osmocom.org/c/libosmo-sigtran/+/41192?usp=email )

Change subject: fix SCCP_MAX_OPTIONAL_DATA 128 ......................................................................

fix SCCP_MAX_OPTIONAL_DATA 128

Related: SYS#7600 Change-Id: I841dbb2e8cbc13708ba7f5593f6bdd3b8da4329c --- M include/osmocom/sccp/sccp_types.h 1 file changed, 19 insertions(+), 1 deletion(-)

git pull ssh://gerrit.osmocom.org:29418/libosmo-sigtran refs/changes/92/41192/1

diff --git a/include/osmocom/sccp/sccp_types.h b/include/osmocom/sccp/sccp_types.h index 5be0392..ab688b3 100644 --- a/include/osmocom/sccp/sccp_types.h +++ b/include/osmocom/sccp/sccp_types.h @@ -24,7 +24,25 @@ #include <osmocom/core/endian.h> #include <osmocom/core/utils.h>

-#define SCCP_MAX_OPTIONAL_DATA 130 +/* ITU Q.713 3.16 Data is a variable-length IE, meaning it has two header + * octets: + * - one octet of "Parameter name code", + * - plus one octet of length. + * + * In + * - 4.2 CR, + * - 4.3 CC, + * - 4.4 CREF, + * - 4.5 RLSD, + * there are optional "Data" IEs with length indicated as "3-130" octets: the + * minimum of 3 stems from the two header octets plus one data octet. Note that + * when there are zero data octets, the entire "Data" IE is omitted. + * + * Hence, the maximum of 130 includes the two header octets, and the actual + * maximum data length is 128. + */ +#define SCCP_MAX_OPTIONAL_DATA 128 + #define SCCP_MAX_DATA 256

/* Table 1/Q.713 - SCCP message types */