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net: Define IP flag field values 

These defines were pulled from the "Add simple
IP/UDP fragmentation support" patch from Frank
Haverkamp <haver@vnet.ibm.com>.

Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
Signed-off-by: Ben Warren <biggerbadderben@gmail.com>
This commit is contained in:
Peter Tyser 2008-12-01 16:26:20 -06:00 committed by Ben Warren
parent 23afaba65e
commit e0c07b868c
2 changed files with 9 additions and 3 deletions
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6
include/net.h
View File

@ -200,6 +200,12 @@ typedef struct {
ushort udp_xsum; /* Checksum */
} IP_t;
#define IP_OFFS 0x1fff /* ip offset *= 8 */
#define IP_FLAGS 0xe000 /* first 3 bits */
#define IP_FLAGS_RES 0x8000 /* reserved */
#define IP_FLAGS_DFRAG 0x4000 /* don't fragments */
#define IP_FLAGS_MFRAG 0x2000 /* more fragments */
#define IP_HDR_SIZE_NO_UDP (sizeof (IP_t) - 8)
#define IP_HDR_SIZE (sizeof (IP_t))

6
net/net.c
View File

@ -735,7 +735,7 @@ int PingSend(void)
ip->ip_tos = 0;
ip->ip_len = htons(IP_HDR_SIZE_NO_UDP + 8);
ip->ip_id = htons(NetIPID++);
ip->ip_off = htons(0x4000); /* No fragmentation */
ip->ip_off = htons(IP_FLAGS_DFRAG); /* Don't fragment */
ip->ip_ttl = 255;
ip->ip_p = 0x01; /* ICMP */
ip->ip_sum = 0;
@ -1399,7 +1399,7 @@ NetReceive(volatile uchar * inpkt, int len)
if ((ip->ip_hl_v & 0xf0) != 0x40) {
return;
}
if (ip->ip_off & htons(0x1fff)) { /* Can't deal w/ fragments */
if (ip->ip_off & htons(IP_OFFS)) { /* Can't deal w/ fragments */
return;
}
/* can't deal with headers > 20 bytes */
@ -1698,7 +1698,7 @@ NetSetIP(volatile uchar * xip, IPaddr_t dest, int dport, int sport, int len)
ip->ip_tos = 0;
ip->ip_len = htons(IP_HDR_SIZE + len);
ip->ip_id = htons(NetIPID++);
ip->ip_off = htons(0x4000); /* No fragmentation */
ip->ip_off = htons(IP_FLAGS_DFRAG); /* Don't fragment */
ip->ip_ttl = 255;
ip->ip_p = 17; /* UDP */
ip->ip_sum = 0;