xnu-1228.7.58.tar.gz

[apple/xnu.git] / bsd / netinet6 / in6_cksum.c

diff --git a/bsd/netinet6/in6_cksum.c b/bsd/netinet6/in6_cksum.c
index 60cdf2e5b10cf0601a44b130d0cd7b608aaba14d..fd3e143dc1a4e7b1c8cf3db01f2bf04b1c7874fe 100644 (file)
--- a/bsd/netinet6/in6_cksum.c
+++ b/bsd/netinet6/in6_cksum.c
@@ -68,6 +68,7 @@
 #include <sys/param.h>
 #include <sys/mbuf.h>
 #include <sys/systm.h>
+#include <kern/debug.h>
 #include <netinet/in.h>
 #include <netinet/ip6.h>
 
@@ -90,20 +91,15 @@
  * (e.g. TCP header + TCP payload)
  */
 
-int
-in6_cksum(m, nxt, off, len)
-       struct mbuf *m;
-       u_int8_t nxt;
-       u_int32_t off, len;
+u_int16_t
+inet6_cksum(struct mbuf *m, unsigned int nxt, unsigned int off,
+    unsigned int len)
 {
        u_int16_t *w;
        int sum = 0;
        int mlen = 0;
        int byte_swapped = 0;
-#if 0
-       int srcifid = 0, dstifid = 0;
-#endif
-       struct ip6_hdr *ip6;    
+       struct ip6_hdr *ip6;
        union {
                u_int16_t phs[4];
                struct {
@@ -123,52 +119,38 @@ in6_cksum(m, nxt, off, len)
 
        /* sanity check */
        if (m->m_pkthdr.len < off + len) {
-               panic("in6_cksum: mbuf len (%d) < off+len (%d+%d)\n",
-                       m->m_pkthdr.len, off, len);
+               panic("inet6_cksum: mbuf len (%d) < off+len (%d+%d)\n",
+                   m->m_pkthdr.len, off, len);
        }
 
-       bzero(&uph, sizeof(uph));
+       if (nxt != 0) {
+               bzero(&uph, sizeof (uph));
 
-       /*
-        * First create IP6 pseudo header and calculate a summary.
-        */
-       ip6 = mtod(m, struct ip6_hdr *);
-#if 0
-       if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) {
-               srcifid = ip6->ip6_src.s6_addr16[1];
-               ip6->ip6_src.s6_addr16[1] = 0;
-       }
-       if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) {
-               dstifid = ip6->ip6_dst.s6_addr16[1];
-               ip6->ip6_dst.s6_addr16[1] = 0;
-       }
-#endif
-       w = (u_int16_t *)&ip6->ip6_src;
-       uph.ph.ph_len = htonl(len);
-       uph.ph.ph_nxt = nxt;
+               /*
+                * First create IP6 pseudo header and calculate a summary.
+                */
+               ip6 = mtod(m, struct ip6_hdr *);
+               w = (u_int16_t *)&ip6->ip6_src;
+               uph.ph.ph_len = htonl(len);
+               uph.ph.ph_nxt = nxt;
 
-       /* IPv6 source address */
-       sum += w[0];
-       if (!IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
-               sum += w[1];
-       sum += w[2]; sum += w[3]; sum += w[4]; sum += w[5];
-       sum += w[6]; sum += w[7];
-       /* IPv6 destination address */
-       sum += w[8];
-       if (!IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
-               sum += w[9];
-       sum += w[10]; sum += w[11]; sum += w[12]; sum += w[13];
-       sum += w[14]; sum += w[15];
-       /* Payload length and upper layer identifier */
-       sum += uph.phs[0];  sum += uph.phs[1];
-       sum += uph.phs[2];  sum += uph.phs[3];
+               /* IPv6 source address */
+               sum += w[0];
+               if (!IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
+                       sum += w[1];
+               sum += w[2]; sum += w[3]; sum += w[4]; sum += w[5];
+               sum += w[6]; sum += w[7];
+               /* IPv6 destination address */
+               sum += w[8];
+               if (!IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
+                       sum += w[9];
+               sum += w[10]; sum += w[11]; sum += w[12]; sum += w[13];
+               sum += w[14]; sum += w[15];
+               /* Payload length and upper layer identifier */
+               sum += uph.phs[0];  sum += uph.phs[1];
+               sum += uph.phs[2];  sum += uph.phs[3];
+       }
 
-#if 0
-       if (srcifid)
-               ip6->ip6_src.s6_addr16[1] = srcifid;
-       if (dstifid)
-               ip6->ip6_dst.s6_addr16[1] = dstifid;
-#endif
        /*
         * Secondly calculate a summary of the first mbuf excluding offset.
         */
@@ -236,7 +218,7 @@ in6_cksum(m, nxt, off, len)
        /*
         * Lastly calculate a summary of the rest of mbufs.
         */
-       
+
        for (;m && len; m = m->m_next) {
                if (m->m_len == 0)
                        continue;
@@ -308,7 +290,7 @@ in6_cksum(m, nxt, off, len)
                        s_util.c[0] = *(char *)w;
        }
        if (len)
-               panic("in6_cksum: out of data\n");
+               printf("inet6_cksum: out of data by %d\n", len);
        if (mlen == -1) {
                /* The last mbuf has odd # of bytes. Follow the
                   standard (the odd byte may be shifted left by 8 bits