On big endian arches UDP/TCP checksum is incorrectly computed when
payload length is odd.
Signed-off-by: Alin Nastac <alin.nastac@xxxxxxxxx>
---
src/extra/checksum.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/src/extra/checksum.c b/src/extra/checksum.c
index 4d52a99..42389aa 100644
--- a/src/extra/checksum.c
+++ b/src/extra/checksum.c
@@ -11,6 +11,7 @@
#include <stdio.h>
#include <stdbool.h>
+#include <endian.h>
#include <arpa/inet.h>
#include <netinet/ip.h>
#include <netinet/ip6.h>
@@ -26,8 +27,13 @@ uint16_t nfq_checksum(uint32_t sum, uint16_t *buf, int size)
sum += *buf++;
size -= sizeof(uint16_t);
}
- if (size)
- sum += *(uint8_t *)buf;
+ if (size) {
+#if __BYTE_ORDER == __BIG_ENDIAN
+ sum += (uint16_t)*(uint8_t *)buf << 8;
+#else
+ sum += (uint16_t)*(uint8_t *)buf;
+#endif
+ }
sum = (sum >> 16) + (sum & 0xffff);
sum += (sum >>16);
--
2.7.4
