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net: cosmetic: Replace magic numbers in arp.c with constants

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Use field names and sizes when accessing ARP packets

Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>
This commit is contained in:
Joe Hershberger
2012-05-23 07:58:17 +00:00
parent 1256793b18
commit 674bb24982
2 changed files with 23 additions and 17 deletions
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6
include/net.h
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@@ -259,7 +259,9 @@ struct arp_hdr {
# define ARP_ETHER 1 /* Ethernet hardware address */
ushort ar_pro; /* Format of protocol address */
uchar ar_hln; /* Length of hardware address */
# define ARP_HLEN 6
uchar ar_pln; /* Length of protocol address */
# define ARP_PLEN 4
ushort ar_op; /* Operation */
# define ARPOP_REQUEST 1 /* Request to resolve address */
# define ARPOP_REPLY 2 /* Response to previous request */
@@ -273,6 +275,10 @@ struct arp_hdr {
* specific hardware/protocol combinations.
*/
uchar ar_data[0];
#define ar_sha ar_data[0]
#define ar_spa ar_data[ARP_HLEN]
#define ar_tha ar_data[ARP_HLEN + ARP_PLEN]
#define ar_tpa ar_data[ARP_HLEN + ARP_PLEN + ARP_HLEN]
#if 0
uchar ar_sha[]; /* Sender hardware address */
uchar ar_spa[]; /* Sender protocol address */