networking: consolidate the IP checksum code. -129 bytes.

[platform/upstream/busybox.git] / networking / traceroute.c

diff --git a/networking/traceroute.c b/networking/traceroute.c
index c321035..d197e54 100644 (file)
--- a/networking/traceroute.c
+++ b/networking/traceroute.c
@@ -418,39 +418,6 @@ wait_for_reply(len_and_sockaddr *from_lsa, struct sockaddr *to, unsigned *timest
        return read_len;
 }
 
-/*
- * Checksum routine for Internet Protocol family headers (C Version)
- */
-static uint16_t
-in_cksum(uint16_t *addr, int len)
-{
-       int nleft = len;
-       uint16_t *w = addr;
-       uint16_t answer;
-       int sum = 0;
-
-       /*
-        * Our algorithm is simple, using a 32 bit accumulator (sum),
-        * we add sequential 16 bit words to it, and at the end, fold
-        * back all the carry bits from the top 16 bits into the lower
-        * 16 bits.
-        */
-       while (nleft > 1) {
-               sum += *w++;
-               nleft -= 2;
-       }
-
-       /* mop up an odd byte, if necessary */
-       if (nleft == 1)
-               sum += *(unsigned char *)w;
-
-       /* add back carry outs from top 16 bits to low 16 bits */
-       sum = (sum >> 16) + (sum & 0xffff);     /* add hi 16 to low 16 */
-       sum += (sum >> 16);                     /* add carry */
-       answer = ~sum;                          /* truncate to 16 bits */
-       return answer;
-}
-
 static void
 send_probe(int seq, int ttl)
 {
@@ -477,7 +444,7 @@ send_probe(int seq, int ttl)
 
                        /* Always calculate checksum for icmp packets */
                        outicmp->icmp_cksum = 0;
-                       outicmp->icmp_cksum = in_cksum((uint16_t *)outicmp,
+                       outicmp->icmp_cksum = inet_cksum((uint16_t *)outicmp,
                                                packlen - (sizeof(*outip) + optlen));
                        if (outicmp->icmp_cksum == 0)
                                outicmp->icmp_cksum = 0xffff;