From b49e6f5a65d437cb7e7bdefe8397e0f550496012 Mon Sep 17 00:00:00 2001
From: Ondrej Zajicek <santiago@crfreenet.org>
Date: Tue, 25 Aug 2009 16:42:14 +0200
Subject: Temporary OSPFv3 development commit

---
 lib/ipv6.c | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 lib/ipv6.h |  1 +
 2 files changed, 55 insertions(+)

(limited to 'lib')

diff --git a/lib/ipv6.c b/lib/ipv6.c
index 88c54eb..3334b97 100644
--- a/lib/ipv6.c
+++ b/lib/ipv6.c
@@ -136,6 +136,60 @@ ipv6_compare(ip_addr X, ip_addr Y)
   return 0;
 }
 
+/* From Linux include/net/ipv6.h */
+#define NEXTHDR_HOP             0       /* Hop-by-hop option header. */
+#define NEXTHDR_ROUTING         43      /* Routing header. */
+#define NEXTHDR_FRAGMENT        44      /* Fragmentation/reassembly header. */
+#define NEXTHDR_DEST            60      /* Destination options header. */
+#define NEXTHDR_NONE            59      /* No next header */
+
+#define NEXTHDR_ESP             50      /* Encapsulating security payload. */
+#define NEXTHDR_AUTH            51      /* Authentication header. */
+
+
+byte *
+ipv6_skip_header(byte *pkt, int *len)
+{
+  int l = *len;
+  int q;
+  u8 nh;
+
+  if (l < 40 || (*pkt & 0xf0) != 0x60)
+    return NULL;
+
+  /* Skip IPv6 header */
+  nh = pkt[6];
+  pkt += 40;
+
+  while ()
+    {
+      switch (nw)
+	{
+	case NEXTHDR_FRAGMENT:
+
+	case NEXTHDR_HOP:
+	case NEXTHDR_ROUTING:
+	case NEXTHDR_DEST:
+
+	case NEXTHDR_AUTH:
+	  break;
+
+	case NEXTHDR_NONE:
+	  return NULL;
+
+	default:
+	  return pkt;
+	}
+    }
+
+  q = (*pkt & 0x0f) * 4;
+  if (q > l)
+    return NULL;
+  *len -= q;
+  return pkt + q;
+}
+
+
 /*
  *  Conversion of IPv6 address to presentation format and vice versa.
  *  Heavily inspired by routines written by Paul Vixie for the BIND project
diff --git a/lib/ipv6.h b/lib/ipv6.h
index 9cec86e..d2b77c0 100644
--- a/lib/ipv6.h
+++ b/lib/ipv6.h
@@ -1,3 +1,4 @@
+
 /*
  *	BIRD -- IP Addresses et Cetera for IPv6
  *
-- 
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