Correctly set address length in arp frames

Kernel commit 99137b7 introduced an additional check of the address
length. This exposed a bug in the arp code where the address length was
being set incorrectly.
Now the length is set from the ETH_ALEN constant declared in
linux/if_ether.h

This fixes #2314

1 files changed, 1 insertions, 1 deletions

diff --git a/src/fnet/arp.c b/src/fnet/arp.c
index 794f6c8c8..3c2a2361b 100644
--- a/src/fnet/arp.c
+++ b/src/fnet/arp.c
@@ -124,7 +124,7 @@ void arp_scan(const char *dev, uint32_t ifip, uint32_t ifmask) {
                                 errExit("if_nametoindex");
                         addr.sll_family = AF_PACKET;
                         memcpy (addr.sll_addr, mac, 6);
-                        addr.sll_halen = htons(6);
+                        addr.sll_halen = ETH_ALEN;
 
                         // build the arp packet header
                         ArpHdr hdr;