1 files changed, 76 insertions, 0 deletions
diff --git a/libdnet-stripped/src/ip6.c b/libdnet-stripped/src/ip6.c
new file mode 100644
index 0000000..b5f474b
--- /dev/null
+++ b/libdnet-stripped/src/ip6.c
@@ -0,0 +1,76 @@
+/*
+ * ip6.c
+ *
+ * Copyright (c) 2002 Dug Song <dugsong@monkey.org>
+ *
+ * $Id: ip6.c 539 2005-01-23 07:36:54Z dugsong $
+ */
+
+#ifdef _WIN32
+#include "dnet_winconfig.h"
+#else
+#include "config.h"
+#endif
+
+#include "dnet.h"
+
+#define IP6_IS_EXT(n)	\
+	((n) == IP_PROTO_HOPOPTS || (n) == IP_PROTO_DSTOPTS || \
+	 (n) == IP_PROTO_ROUTING || (n) == IP_PROTO_FRAGMENT)
+
+void
+ip6_checksum(void *buf, size_t len)
+{
+	struct ip6_hdr *ip6 = (struct ip6_hdr *)buf;
+	struct ip6_ext_hdr *ext;
+	u_char *p, nxt;
+	int i, sum;
+	
+	nxt = ip6->ip6_nxt;
+	
+	for (i = IP6_HDR_LEN; IP6_IS_EXT(nxt); i += (ext->ext_len + 1) << 3) {
+		if (i >= (int)len) return;
+		ext = (struct ip6_ext_hdr *)((u_char *)buf + i);
+		nxt = ext->ext_nxt;
+	}
+	p = (u_char *)buf + i;
+	len -= i;
+	
+	if (nxt == IP_PROTO_TCP) {
+		struct tcp_hdr *tcp = (struct tcp_hdr *)p;
+		
+		if (len >= TCP_HDR_LEN) {
+			tcp->th_sum = 0;
+			sum = ip_cksum_add(tcp, len, 0) + htons(nxt + (u_short)len);
+			sum = ip_cksum_add(&ip6->ip6_src, 32, sum);
+			tcp->th_sum = ip_cksum_carry(sum);
+		}
+	} else if (nxt == IP_PROTO_UDP) {
+		struct udp_hdr *udp = (struct udp_hdr *)p;
+
+		if (len >= UDP_HDR_LEN) {
+			udp->uh_sum = 0;
+			sum = ip_cksum_add(udp, len, 0) + htons(nxt + (u_short)len);
+			sum = ip_cksum_add(&ip6->ip6_src, 32, sum);
+			if ((udp->uh_sum = ip_cksum_carry(sum)) == 0)
+				udp->uh_sum = 0xffff;
+		}
+	} else if (nxt == IP_PROTO_ICMPV6) {
+		struct icmp_hdr *icmp = (struct icmp_hdr *)p;
+
+		if (len >= ICMP_HDR_LEN) {
+			icmp->icmp_cksum = 0;
+			sum = ip_cksum_add(icmp, len, 0) + htons(nxt + (u_short)len);
+			sum = ip_cksum_add(&ip6->ip6_src, 32, sum);
+			icmp->icmp_cksum = ip_cksum_carry(sum);
+		}		
+	} else if (nxt == IP_PROTO_ICMP || nxt == IP_PROTO_IGMP) {
+		struct icmp_hdr *icmp = (struct icmp_hdr *)p;
+		
+		if (len >= ICMP_HDR_LEN) {
+			icmp->icmp_cksum = 0;
+			sum = ip_cksum_add(icmp, len, 0);
+			icmp->icmp_cksum = ip_cksum_carry(sum);
+		}
+	}
+}