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net: Add net_update_ether() to handle ARP and Ping replies

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When the network is VLAN or SNAP, net_update_ether() will preserve
the original Ethernet packet header and simply replace the src and
dest MACs and the protocol

Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>
Acked-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Joe Hershberger
2012-05-23 07:59:16 +00:00
parent ece223b52a
commit e711101581
4 changed files with 30 additions and 6 deletions
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23
net/net.c
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@@ -1276,6 +1276,29 @@ NetSetEther(uchar *xet, uchar * addr, uint prot)
}
}
int net_update_ether(struct ethernet_hdr *et, uchar *addr, uint prot)
{
ushort protlen;
memcpy(et->et_dest, addr, 6);
memcpy(et->et_src, NetOurEther, 6);
protlen = ntohs(et->et_protlen);
if (protlen == PROT_VLAN) {
struct vlan_ethernet_hdr *vet =
(struct vlan_ethernet_hdr *)et;
vet->vet_type = htons(prot);
return VLAN_ETHER_HDR_SIZE;
} else if (protlen > 1514) {
et->et_protlen = htons(prot);
return ETHER_HDR_SIZE;
} else {
/* 802.2 + SNAP */
struct e802_hdr *et802 = (struct e802_hdr *)et;
et802->et_prot = htons(prot);
return E802_HDR_SIZE;
}
}
void net_set_ip_header(uchar *pkt, IPaddr_t dest, IPaddr_t source)
{
struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt;