sctp/doc: list possible values for enum keywords

Ticket: 8675

doc/userguide/rules/sctp-keywords.rst

@@ -104,6 +104,8 @@ shutdown_complete 14
 forward_tsn       192
 ================= =====
 
+See ``suricata --list-keywords=json | jq '."sctp.chunk_type".enum_values'``
+
 Named values are case-insensitive and can be negated with ``!``::
 
  sctp.chunk_type:init          # INIT chunk

rust/src/sctp/detect.rs

@@ -18,6 +18,9 @@
 // Author: Giuseppe Longo <glongo@oisf.net>
 
 use crate::detect::uint::{detect_parse_uint_enum, DetectUintData};
+use crate::detect::EnumString;
+use crate::jsonbuilder::JsonBuilder;
+use suricata_sys::sys::SCJsonBuilder;
 
 use std::ffi::CStr;
 
@@ -82,6 +85,12 @@ pub extern "C" fn SCSctpChunkTypeToString(val: u8) -> *const std::os::raw::c_cha
     s.as_ptr() as *const std::os::raw::c_char
 }
 
+#[no_mangle]
+pub unsafe extern "C" fn SCDetectSCTPChunkTypeListValues(jsb: *mut SCJsonBuilder) {
+    let jsb = cast_pointer!(jsb, JsonBuilder);
+    let _ = SctpChunkType::list_values(jsb);
+}
+
 #[cfg(test)]
 mod test {
     use super::*;

src/detect-sctp-chunk-type.c

@@ -45,6 +45,11 @@ void DetectSCTPChunkTypeFree(DetectEngineCtx *, void *);
 static int PrefilterSetupSCTPChunkType(DetectEngineCtx *de_ctx, SigGroupHead *sgh);
 static bool PrefilterSCTPChunkTypeIsPrefilterable(const Signature *s);
 
+static void DetectSCTPChunkTypeListValues(SCJsonBuilder *jsb)
+{
+    SCDetectSCTPChunkTypeListValues(jsb);
+}
+
 void DetectSCTPChunkTypeRegister(void)
 {
     sigmatch_table[DETECT_SCTP_CHUNK_TYPE].name = "sctp.chunk_type";
@@ -57,6 +62,7 @@ void DetectSCTPChunkTypeRegister(void)
     sigmatch_table[DETECT_SCTP_CHUNK_TYPE].SupportsPrefilter =
             PrefilterSCTPChunkTypeIsPrefilterable;
     sigmatch_table[DETECT_SCTP_CHUNK_TYPE].SetupPrefilter = PrefilterSetupSCTPChunkType;
+    sigmatch_table[DETECT_SCTP_CHUNK_TYPE].JsonAdditionalInfo = DetectSCTPChunkTypeListValues;
 }
 
 static int DetectSCTPChunkTypeMatch(