decode/ipv6: track length of ext hdrs

src/decode-ipv6.c

@@ -159,6 +159,8 @@ DecodeIPV6ExtHdrs(ThreadVars *tv, DecodeThreadVars *dtv, Packet *p, uint8_t *pkt
 
     while(1)
     {
+        IPV6_SET_EXTHDRS_LEN(p, (len - plen));
+
         if (nh == IPPROTO_NONE) {
             if (plen > 0) {
                 /* No upper layer, but we do have data. Suspicious. */

src/decode-ipv6.h

@@ -69,7 +69,8 @@ typedef struct IPV6Hdr_
 #define IPV6_SET_RAW_VER(ip6h, value)   ((ip6h)->s_ip6_vfc = (((ip6h)->s_ip6_vfc & 0x0f) | (value << 4)))
 #define IPV6_SET_RAW_NH(ip6h, value)    ((ip6h)->s_ip6_nxt = (value))
 
-#define IPV6_SET_L4PROTO(p,proto)       (p)->ip6vars.l4proto = proto
+#define IPV6_SET_L4PROTO(p,proto)       (p)->ip6vars.l4proto = (proto)
+#define IPV6_SET_EXTHDRS_LEN(p,len)     (p)->ip6vars.exthdrs_len = (len)
 
 
 /* ONLY call these functions after making sure that:
@@ -88,9 +89,11 @@ typedef struct IPV6Hdr_
     IPV6_GET_RAW_PLEN((p)->ip6h)
 #define IPV6_GET_HLIM(p) \
     (IPV6_GET_RAW_HLIM((p)->ip6h))
-/* XXX */
+
 #define IPV6_GET_L4PROTO(p) \
     ((p)->ip6vars.l4proto)
+#define IPV6_GET_EXTHDRS_LEN(p) \
+    ((p)->ip6vars.exthdrs_len)
 
 /** \brief get the highest proto/next header field we know */
 //#define IPV6_GET_UPPER_PROTO(p)         (p)->ip6eh.ip6_exthdrs_cnt ?
@@ -99,14 +102,16 @@ typedef struct IPV6Hdr_
 /* helper structure with parsed ipv6 info */
 typedef struct IPV6Vars_
 {
-    uint8_t l4proto;      /* the proto after the extension headers
-                            * store while decoding so we don't have
-                            * to loop through the exthdrs all the time */
+    uint8_t l4proto;       /**< the proto after the extension headers
+                            *   store while decoding so we don't have
+                            *   to loop through the exthdrs all the time */
+    uint16_t exthdrs_len;  /**< length of the exthdrs */
 } IPV6Vars;
 
 #define CLEAR_IPV6_PACKET(p) do { \
     (p)->ip6h = NULL; \
     (p)->ip6vars.l4proto = 0; \
+    (p)->ip6vars.exthdrs_len = 0; \
     memset(&(p)->ip6eh, 0x00, sizeof((p)->ip6eh)); \
 } while (0)