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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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1
include/net.h
View file

@ -449,6 +449,7 @@ extern int NetEthHdrSize(void);
/* Set ethernet header; returns the size of the header */
extern int NetSetEther(uchar *, uchar *, uint);
extern int net_update_ether(struct ethernet_hdr *et, uchar *addr, uint prot);
/* Set IP header */
extern void net_set_ip_header(uchar *pkt, IPaddr_t dest, IPaddr_t source);

2
net/arp.c
View file

@ -158,7 +158,7 @@ void ArpReceive(struct ethernet_hdr *et, struct ip_udp_hdr *ip, int len)
/* reply with our IP address */
debug("Got ARP REQUEST, return our IP\n");
pkt = (uchar *)et;
eth_hdr_size = NetSetEther(pkt, et->et_src, PROT_ARP);
eth_hdr_size = net_update_ether(et, et->et_src, PROT_ARP);
pkt += eth_hdr_size;
arp->ar_op = htons(ARPOP_REPLY);
memcpy(&arp->ar_tha, &arp->ar_sha, ARP_HLEN);

23
net/net.c
View file

@ -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;

10
net/ping.c
View file

@ -87,6 +87,7 @@ void ping_receive(struct ethernet_hdr *et, struct ip_udp_hdr *ip, int len)
{
struct icmp_hdr *icmph = (struct icmp_hdr *)&ip->udp_src;
IPaddr_t src_ip;
int eth_hdr_size;
switch (icmph->type) {
case ICMP_ECHO_REPLY:
@ -95,11 +96,10 @@ void ping_receive(struct ethernet_hdr *et, struct ip_udp_hdr *ip, int len)
net_set_state(NETLOOP_SUCCESS);
return;
case ICMP_ECHO_REQUEST:
debug("Got ICMP ECHO REQUEST, return "
"%d bytes\n", ETHER_HDR_SIZE + len);
eth_hdr_size = net_update_ether(et, et->et_src, PROT_IP);
memcpy(&et->et_dest[0], &et->et_src[0], 6);
memcpy(&et->et_src[0], NetOurEther, 6);
debug("Got ICMP ECHO REQUEST, return "
"%d bytes\n", eth_hdr_size + len);
ip->ip_sum = 0;
ip->ip_off = 0;
@ -112,7 +112,7 @@ void ping_receive(struct ethernet_hdr *et, struct ip_udp_hdr *ip, int len)
icmph->checksum = 0;
icmph->checksum = ~NetCksum((uchar *)icmph,
(len - IP_HDR_SIZE) >> 1);
NetSendPacket((uchar *)et, ETHER_HDR_SIZE + len);
NetSendPacket((uchar *)et, eth_hdr_size + len);
return;
/* default:
return;*/