From d87a457be8f156ca6e775ffa785a96b0766d4e50 Mon Sep 17 00:00:00 2001 From: Joe Hershberger Date: Sun, 22 Mar 2015 17:09:14 -0500 Subject: [PATCH] sandbox: eth: Add ARP and PING response to sandbox driver 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 Reviewed-by: Simon Glass --- arch/sandbox/dts/sandbox.dts | 1 + drivers/net/sandbox.c | 107 +++++++++++++++++++++++++++++++++++ include/configs/sandbox.h | 1 + 3 files changed, 109 insertions(+) diff --git a/arch/sandbox/dts/sandbox.dts b/arch/sandbox/dts/sandbox.dts index 0df7b40beb..f5e05178e4 100644 --- a/arch/sandbox/dts/sandbox.dts +++ b/arch/sandbox/dts/sandbox.dts @@ -204,5 +204,6 @@ eth@10002000 { compatible = "sandbox,eth"; reg = <0x10002000 0x1000>; + fake-host-hwaddr = [00 00 66 44 22 00]; }; }; diff --git a/drivers/net/sandbox.c b/drivers/net/sandbox.c index 522990d8df..cb69a95d97 100644 --- a/drivers/net/sandbox.c +++ b/drivers/net/sandbox.c @@ -14,22 +14,128 @@ DECLARE_GLOBAL_DATA_PTR; +/** + * struct eth_sandbox_priv - memory for sandbox mock driver + * + * fake_host_hwaddr: MAC address of mocked machine + * fake_host_ipaddr: IP address of mocked machine + * recv_packet_buffer: buffer of the packet returned as received + * recv_packet_length: length of the packet returned as received + */ +struct eth_sandbox_priv { + uchar fake_host_hwaddr[ARP_HLEN]; + IPaddr_t fake_host_ipaddr; + uchar *recv_packet_buffer; + int recv_packet_length; +}; + static int sb_eth_start(struct udevice *dev) { + struct eth_sandbox_priv *priv = dev_get_priv(dev); + debug("eth_sandbox: Start\n"); + fdtdec_get_byte_array(gd->fdt_blob, dev->of_offset, "fake-host-hwaddr", + priv->fake_host_hwaddr, ARP_HLEN); + priv->recv_packet_buffer = net_rx_packets[0]; return 0; } static int sb_eth_send(struct udevice *dev, void *packet, int length) { + struct eth_sandbox_priv *priv = dev_get_priv(dev); + struct ethernet_hdr *eth = packet; + debug("eth_sandbox: Send packet %d\n", length); + if (ntohs(eth->et_protlen) == PROT_ARP) { + struct arp_hdr *arp = packet + ETHER_HDR_SIZE; + + if (ntohs(arp->ar_op) == ARPOP_REQUEST) { + struct ethernet_hdr *eth_recv; + struct arp_hdr *arp_recv; + + /* store this as the assumed IP of the fake host */ + priv->fake_host_ipaddr = NetReadIP(&arp->ar_tpa); + /* Formulate a fake response */ + 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); + + 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) { + struct ethernet_hdr *eth_recv; + struct ip_udp_hdr *ipr; + struct icmp_hdr *icmpr; + + /* reply to the ping */ + memcpy(priv->recv_packet_buffer, packet, + length); + eth_recv = (void *)priv->recv_packet_buffer; + ipr = (void *)priv->recv_packet_buffer + + ETHER_HDR_SIZE; + 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 = compute_ip_checksum(ipr, + IP_HDR_SIZE); + + icmpr->type = ICMP_ECHO_REPLY; + icmpr->checksum = 0; + icmpr->checksum = compute_ip_checksum(icmpr, + ICMP_HDR_SIZE); + + priv->recv_packet_length = length; + } + } + } + return 0; } static int sb_eth_recv(struct udevice *dev, uchar **packetp) { + struct eth_sandbox_priv *priv = dev_get_priv(dev); + + 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; + *packetp = priv->recv_packet_buffer; + return lcl_recv_packet_length; + } return 0; } @@ -80,5 +186,6 @@ U_BOOT_DRIVER(eth_sandbox) = { .ofdata_to_platdata = sb_eth_ofdata_to_platdata, .remove = sb_eth_remove, .ops = &sb_eth_ops, + .priv_auto_alloc_size = sizeof(struct eth_sandbox_priv), .platdata_auto_alloc_size = sizeof(struct eth_pdata), }; diff --git a/include/configs/sandbox.h b/include/configs/sandbox.h index 01c6f19bd9..e225ce6772 100644 --- a/include/configs/sandbox.h +++ b/include/configs/sandbox.h @@ -130,6 +130,7 @@ /* include default commands */ #include +#define CONFIG_CMD_PING #define CONFIG_CMD_HASH #define CONFIG_HASH_VERIFY -- 2.39.5