X-Git-Url: http://git.cascardo.eti.br/?a=blobdiff_plain;f=lib%2Fcsum.c;h=a0e9967167ea49ed65f17ed95990daa0dba4f925;hb=HEAD;hp=fb32a530dfce8d9935b78cb24906dfc7df2ce2c8;hpb=bc7a5acdff087b7e7a162da42ae608a83f3cf902;p=cascardo%2Fovs.git

diff --git a/lib/csum.c b/lib/csum.c
index fb32a530d..a0e996716 100644
--- a/lib/csum.c
+++ b/lib/csum.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008, 2009, 2010, 2011 Nicira, Inc.
+ * Copyright (c) 2008, 2009, 2010, 2011, 2013, 2015 Nicira, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -19,7 +19,6 @@
 #include "unaligned.h"
 
 #ifndef __CHECKER__
-
 /* Returns the IP checksum of the 'n' bytes in 'data'.
  *
  * The return value has the same endianness as the data.  That is, if 'data'
@@ -32,25 +31,6 @@ csum(const void *data, size_t n)
     return csum_finish(csum_continue(0, data, n));
 }
 
-/* Adds the 16 bits in 'new' to the partial IP checksum 'partial' and returns
- * the updated checksum.  (To start a new checksum, pass 0 for 'partial'.  To
- * obtain the finished checksum, pass the return value to csum_finish().) */
-uint32_t
-csum_add16(uint32_t partial, ovs_be16 new)
-{
-    return partial + new;
-}
-
-/* Adds the 32 bits in 'new' to the partial IP checksum 'partial' and returns
- * the updated checksum.  (To start a new checksum, pass 0 for 'partial'.  To
- * obtain the finished checksum, pass the return value to csum_finish().) */
-uint32_t
-csum_add32(uint32_t partial, ovs_be32 new)
-{
-    return partial + (new >> 16) + (new & 0xffff);
-}
-
-
 /* Adds the 'n' bytes in 'data' to the partial IP checksum 'partial' and
  * returns the updated checksum.  (To start a new checksum, pass 0 for
  * 'partial'.  To obtain the finished checksum, pass the return value to
@@ -112,18 +92,35 @@ recalc_csum32(ovs_be16 old_csum, ovs_be32 old_u32, ovs_be32 new_u32)
                          old_u32 >> 16, new_u32 >> 16);
 }
 
+/* Returns the new checksum for a packet in which the checksum field previously
+ * contained 'old_csum' and in which a field that contained the 6 bytes at
+ * 'old_mac' was changed to contain the 6 bytes at 'new_mac'. */
+ovs_be16
+recalc_csum48(ovs_be16 old_csum, const struct eth_addr old_mac,
+              const struct eth_addr new_mac)
+{
+    ovs_be16 new_csum = old_csum;
+
+    for (int i = 0; i < 3; ++i) {
+        new_csum = recalc_csum16(new_csum, old_mac.be16[i], new_mac.be16[i]);
+    }
+
+    return new_csum;
+}
+
 /* Returns the new checksum for a packet in which the checksum field previously
  * contained 'old_csum' and in which a field that contained 'old_u32[4]' was
  * changed to contain 'new_u32[4]'. */
 ovs_be16
-recalc_csum128(ovs_be16 old_csum, ovs_be32 old_u32[4],
+recalc_csum128(ovs_be16 old_csum, ovs_16aligned_be32 old_u32[4],
                const ovs_be32 new_u32[4])
 {
     ovs_be16 new_csum = old_csum;
     int i;
 
     for (i = 0; i < 4; ++i) {
-        new_csum = recalc_csum32(new_csum, old_u32[i], new_u32[i]);
+        new_csum = recalc_csum32(new_csum,
+                                 get_16aligned_be32(&old_u32[i]), new_u32[i]);
     }
     return new_csum;
 }