@@ -186,5 +186,6 @@
eth@10002000 {
compatible = "sandbox,eth";
reg = <0x10002000 0x1000>;
+ fake-host-hwaddr = <0x00 0x00 0x66 0x44 0x22 0x00>;
};
};
@@ -15,16 +15,102 @@
DECLARE_GLOBAL_DATA_PTR;
+struct eth_sandbox_priv {
+ uchar fake_host_hwaddr[ARP_HLEN];
+ IPaddr_t fake_host_ipaddr;
+ uchar recv_packet_buffer[PKTSIZE];
+ int recv_packet_length;
+};
+
int sb_eth_init(struct udevice *dev, bd_t *bis)
{
debug("eth_sandbox: Init\n");
+ struct eth_sandbox_priv *priv = dev->priv;
+ u32 int_array[ARP_HLEN];
+ int i;
+
+ fdtdec_get_int_array(gd->fdt_blob, dev->of_offset, "fake-host-hwaddr",
+ int_array, ARP_HLEN);
+ for (i = 0; i < ARP_HLEN; i++)
+ priv->fake_host_hwaddr[i] = (uchar)int_array[i];
+
return 0;
}
int sb_eth_send(struct udevice *dev, void *packet, int length)
{
debug("eth_sandbox: Send packet %d\n", length);
+ struct eth_sandbox_priv *priv = dev->priv;
+
+ struct ethernet_hdr *eth = packet;
+ if (ntohs(eth->et_protlen) == PROT_ARP) {
+ struct arp_hdr *arp = packet + ETHER_HDR_SIZE;
+ if (ntohs(arp->ar_op) == ARPOP_REQUEST) {
+ /* store this as the assumed IP of the fake host */
+ priv->fake_host_ipaddr = NetReadIP(&arp->ar_tpa);
+ /* Formulate a fake response */
+ struct ethernet_hdr *eth_recv =
+ (void *)priv->recv_packet_buffer;
+ memcpy(eth_recv->et_dest, eth->et_src, ARP_HLEN);
+ memcpy(eth_recv->et_src, priv->fake_host_hwaddr,
+ ARP_HLEN);
+ eth_recv->et_protlen = htons(PROT_ARP);
+
+ struct arp_hdr *arp_recv =
+ (void *)priv->recv_packet_buffer +
+ ETHER_HDR_SIZE;
+ arp_recv->ar_hrd = htons(ARP_ETHER);
+ arp_recv->ar_pro = htons(PROT_IP);
+ arp_recv->ar_hln = ARP_HLEN;
+ arp_recv->ar_pln = ARP_PLEN;
+ arp_recv->ar_op = htons(ARPOP_REPLY);
+ memcpy(&arp_recv->ar_sha, priv->fake_host_hwaddr,
+ ARP_HLEN);
+ NetWriteIP(&arp_recv->ar_spa, priv->fake_host_ipaddr);
+ memcpy(&arp_recv->ar_tha, &arp->ar_sha, ARP_HLEN);
+ NetCopyIP(&arp_recv->ar_tpa, &arp->ar_spa);
+
+ priv->recv_packet_length = ETHER_HDR_SIZE +
+ ARP_HDR_SIZE;
+ }
+ } else if (ntohs(eth->et_protlen) == PROT_IP) {
+ struct ip_udp_hdr *ip = packet + ETHER_HDR_SIZE;
+ if (ip->ip_p == IPPROTO_ICMP) {
+ struct icmp_hdr *icmp = (struct icmp_hdr *)&ip->udp_src;
+ if (icmp->type == ICMP_ECHO_REQUEST) {
+ /* reply to the ping */
+ memcpy(priv->recv_packet_buffer, packet,
+ length);
+ struct ethernet_hdr *eth_recv =
+ (void *)priv->recv_packet_buffer;
+ struct ip_udp_hdr *ipr =
+ (void *)priv->recv_packet_buffer +
+ ETHER_HDR_SIZE;
+ struct icmp_hdr *icmpr =
+ (struct icmp_hdr *)&ipr->udp_src;
+ memcpy(eth_recv->et_dest, eth->et_src,
+ ARP_HLEN);
+ memcpy(eth_recv->et_src, priv->fake_host_hwaddr,
+ ARP_HLEN);
+ ipr->ip_sum = 0;
+ ipr->ip_off = 0;
+ NetCopyIP((void *)&ipr->ip_dst, &ip->ip_src);
+ NetWriteIP((void *)&ipr->ip_src,
+ priv->fake_host_ipaddr);
+ ipr->ip_sum = ~NetCksum((uchar *)ipr,
+ IP_HDR_SIZE >> 1);
+
+ icmpr->type = ICMP_ECHO_REPLY;
+ icmpr->checksum = 0;
+ icmpr->checksum = ~NetCksum((uchar *)icmpr,
+ (length - ETHER_HDR_SIZE -
+ IP_HDR_SIZE) >> 1);
+
+ priv->recv_packet_length = length;
+ }
+ }
+ }
return 0;
#endif
@@ -32,6 +118,15 @@ int sb_eth_send(struct udevice *dev, void *packet, int length)
int sb_eth_recv(struct udevice *dev)
{
+ struct eth_sandbox_priv *priv = dev->priv;
+ if (priv->recv_packet_length) {
+ int lcl_recv_packet_length = priv->recv_packet_length;
+ debug("eth_sandbox: received packet %d\n",
+ priv->recv_packet_length);
+ priv->recv_packet_length = 0;
+ NetReceive((void *)priv->recv_packet_buffer,
+ lcl_recv_packet_length);
+ }
return 0;
}
The sandbox driver will now generate response traffic to exercise the ping command even when no network exists. This allows the basic data pathways of the DM to be tested. Signed-off-by: Joe Hershberger <joe.hershberger@ni.com> --- Changes in v2: -Change printfs to debug in sandbox driver -Move static data to priv -Move fake hwaddr to the device tree arch/sandbox/dts/sandbox.dts | 1 + drivers/net/sandbox.c | 95 ++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 96 insertions(+)