Joe Hershberger | 6ab7699 | 2015-03-22 17:09:13 -0500 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2015 National Instruments |
| 3 | * |
| 4 | * (C) Copyright 2015 |
| 5 | * Joe Hershberger <joe.hershberger@ni.com> |
| 6 | * |
| 7 | * SPDX-License-Identifier: GPL-2.0 |
| 8 | */ |
| 9 | |
| 10 | #include <common.h> |
| 11 | #include <dm.h> |
| 12 | #include <malloc.h> |
| 13 | #include <net.h> |
| 14 | |
| 15 | DECLARE_GLOBAL_DATA_PTR; |
| 16 | |
Joe Hershberger | e4d7cb1 | 2015-03-22 17:09:14 -0500 | [diff] [blame] | 17 | /** |
| 18 | * struct eth_sandbox_priv - memory for sandbox mock driver |
| 19 | * |
| 20 | * fake_host_hwaddr: MAC address of mocked machine |
| 21 | * fake_host_ipaddr: IP address of mocked machine |
| 22 | * recv_packet_buffer: buffer of the packet returned as received |
| 23 | * recv_packet_length: length of the packet returned as received |
| 24 | */ |
| 25 | struct eth_sandbox_priv { |
| 26 | uchar fake_host_hwaddr[ARP_HLEN]; |
| 27 | IPaddr_t fake_host_ipaddr; |
| 28 | uchar *recv_packet_buffer; |
| 29 | int recv_packet_length; |
| 30 | }; |
| 31 | |
Joe Hershberger | a630b6c | 2015-03-22 17:09:19 -0500 | [diff] [blame] | 32 | static bool disabled[8] = {false}; |
| 33 | |
| 34 | /* |
| 35 | * sandbox_eth_disable_response() |
| 36 | * |
| 37 | * index - The alias index (also DM seq number) |
| 38 | * disable - If non-zero, ignore sent packets and don't send mock response |
| 39 | */ |
| 40 | void sandbox_eth_disable_response(int index, bool disable) |
| 41 | { |
| 42 | disabled[index] = disable; |
| 43 | } |
| 44 | |
Joe Hershberger | 6ab7699 | 2015-03-22 17:09:13 -0500 | [diff] [blame] | 45 | static int sb_eth_start(struct udevice *dev) |
| 46 | { |
Joe Hershberger | e4d7cb1 | 2015-03-22 17:09:14 -0500 | [diff] [blame] | 47 | struct eth_sandbox_priv *priv = dev_get_priv(dev); |
| 48 | |
Joe Hershberger | 6ab7699 | 2015-03-22 17:09:13 -0500 | [diff] [blame] | 49 | debug("eth_sandbox: Start\n"); |
| 50 | |
Joe Hershberger | e4d7cb1 | 2015-03-22 17:09:14 -0500 | [diff] [blame] | 51 | fdtdec_get_byte_array(gd->fdt_blob, dev->of_offset, "fake-host-hwaddr", |
| 52 | priv->fake_host_hwaddr, ARP_HLEN); |
| 53 | priv->recv_packet_buffer = net_rx_packets[0]; |
Joe Hershberger | 6ab7699 | 2015-03-22 17:09:13 -0500 | [diff] [blame] | 54 | return 0; |
| 55 | } |
| 56 | |
| 57 | static int sb_eth_send(struct udevice *dev, void *packet, int length) |
| 58 | { |
Joe Hershberger | e4d7cb1 | 2015-03-22 17:09:14 -0500 | [diff] [blame] | 59 | struct eth_sandbox_priv *priv = dev_get_priv(dev); |
| 60 | struct ethernet_hdr *eth = packet; |
| 61 | |
Joe Hershberger | 6ab7699 | 2015-03-22 17:09:13 -0500 | [diff] [blame] | 62 | debug("eth_sandbox: Send packet %d\n", length); |
| 63 | |
Joe Hershberger | a630b6c | 2015-03-22 17:09:19 -0500 | [diff] [blame] | 64 | if (dev->seq >= 0 && dev->seq < ARRAY_SIZE(disabled) && |
| 65 | disabled[dev->seq]) |
| 66 | return 0; |
| 67 | |
Joe Hershberger | e4d7cb1 | 2015-03-22 17:09:14 -0500 | [diff] [blame] | 68 | if (ntohs(eth->et_protlen) == PROT_ARP) { |
| 69 | struct arp_hdr *arp = packet + ETHER_HDR_SIZE; |
| 70 | |
| 71 | if (ntohs(arp->ar_op) == ARPOP_REQUEST) { |
| 72 | struct ethernet_hdr *eth_recv; |
| 73 | struct arp_hdr *arp_recv; |
| 74 | |
| 75 | /* store this as the assumed IP of the fake host */ |
| 76 | priv->fake_host_ipaddr = NetReadIP(&arp->ar_tpa); |
| 77 | /* Formulate a fake response */ |
| 78 | eth_recv = (void *)priv->recv_packet_buffer; |
| 79 | memcpy(eth_recv->et_dest, eth->et_src, ARP_HLEN); |
| 80 | memcpy(eth_recv->et_src, priv->fake_host_hwaddr, |
| 81 | ARP_HLEN); |
| 82 | eth_recv->et_protlen = htons(PROT_ARP); |
| 83 | |
| 84 | arp_recv = (void *)priv->recv_packet_buffer + |
| 85 | ETHER_HDR_SIZE; |
| 86 | arp_recv->ar_hrd = htons(ARP_ETHER); |
| 87 | arp_recv->ar_pro = htons(PROT_IP); |
| 88 | arp_recv->ar_hln = ARP_HLEN; |
| 89 | arp_recv->ar_pln = ARP_PLEN; |
| 90 | arp_recv->ar_op = htons(ARPOP_REPLY); |
| 91 | memcpy(&arp_recv->ar_sha, priv->fake_host_hwaddr, |
| 92 | ARP_HLEN); |
| 93 | NetWriteIP(&arp_recv->ar_spa, priv->fake_host_ipaddr); |
| 94 | memcpy(&arp_recv->ar_tha, &arp->ar_sha, ARP_HLEN); |
| 95 | NetCopyIP(&arp_recv->ar_tpa, &arp->ar_spa); |
| 96 | |
| 97 | priv->recv_packet_length = ETHER_HDR_SIZE + |
| 98 | ARP_HDR_SIZE; |
| 99 | } |
| 100 | } else if (ntohs(eth->et_protlen) == PROT_IP) { |
| 101 | struct ip_udp_hdr *ip = packet + ETHER_HDR_SIZE; |
| 102 | |
| 103 | if (ip->ip_p == IPPROTO_ICMP) { |
| 104 | struct icmp_hdr *icmp = (struct icmp_hdr *)&ip->udp_src; |
| 105 | |
| 106 | if (icmp->type == ICMP_ECHO_REQUEST) { |
| 107 | struct ethernet_hdr *eth_recv; |
| 108 | struct ip_udp_hdr *ipr; |
| 109 | struct icmp_hdr *icmpr; |
| 110 | |
| 111 | /* reply to the ping */ |
| 112 | memcpy(priv->recv_packet_buffer, packet, |
| 113 | length); |
| 114 | eth_recv = (void *)priv->recv_packet_buffer; |
| 115 | ipr = (void *)priv->recv_packet_buffer + |
| 116 | ETHER_HDR_SIZE; |
| 117 | icmpr = (struct icmp_hdr *)&ipr->udp_src; |
| 118 | memcpy(eth_recv->et_dest, eth->et_src, |
| 119 | ARP_HLEN); |
| 120 | memcpy(eth_recv->et_src, priv->fake_host_hwaddr, |
| 121 | ARP_HLEN); |
| 122 | ipr->ip_sum = 0; |
| 123 | ipr->ip_off = 0; |
| 124 | NetCopyIP((void *)&ipr->ip_dst, &ip->ip_src); |
| 125 | NetWriteIP((void *)&ipr->ip_src, |
| 126 | priv->fake_host_ipaddr); |
| 127 | ipr->ip_sum = compute_ip_checksum(ipr, |
| 128 | IP_HDR_SIZE); |
| 129 | |
| 130 | icmpr->type = ICMP_ECHO_REPLY; |
| 131 | icmpr->checksum = 0; |
| 132 | icmpr->checksum = compute_ip_checksum(icmpr, |
| 133 | ICMP_HDR_SIZE); |
| 134 | |
| 135 | priv->recv_packet_length = length; |
| 136 | } |
| 137 | } |
| 138 | } |
| 139 | |
Joe Hershberger | 6ab7699 | 2015-03-22 17:09:13 -0500 | [diff] [blame] | 140 | return 0; |
| 141 | } |
| 142 | |
| 143 | static int sb_eth_recv(struct udevice *dev, uchar **packetp) |
| 144 | { |
Joe Hershberger | e4d7cb1 | 2015-03-22 17:09:14 -0500 | [diff] [blame] | 145 | struct eth_sandbox_priv *priv = dev_get_priv(dev); |
| 146 | |
| 147 | if (priv->recv_packet_length) { |
| 148 | int lcl_recv_packet_length = priv->recv_packet_length; |
| 149 | |
| 150 | debug("eth_sandbox: received packet %d\n", |
| 151 | priv->recv_packet_length); |
| 152 | priv->recv_packet_length = 0; |
| 153 | *packetp = priv->recv_packet_buffer; |
| 154 | return lcl_recv_packet_length; |
| 155 | } |
Joe Hershberger | 6ab7699 | 2015-03-22 17:09:13 -0500 | [diff] [blame] | 156 | return 0; |
| 157 | } |
| 158 | |
| 159 | static void sb_eth_stop(struct udevice *dev) |
| 160 | { |
| 161 | debug("eth_sandbox: Stop\n"); |
| 162 | } |
| 163 | |
| 164 | static int sb_eth_write_hwaddr(struct udevice *dev) |
| 165 | { |
| 166 | struct eth_pdata *pdata = dev_get_platdata(dev); |
| 167 | |
| 168 | debug("eth_sandbox %s: Write HW ADDR - %pM\n", dev->name, |
| 169 | pdata->enetaddr); |
| 170 | return 0; |
| 171 | } |
| 172 | |
| 173 | static const struct eth_ops sb_eth_ops = { |
| 174 | .start = sb_eth_start, |
| 175 | .send = sb_eth_send, |
| 176 | .recv = sb_eth_recv, |
| 177 | .stop = sb_eth_stop, |
| 178 | .write_hwaddr = sb_eth_write_hwaddr, |
| 179 | }; |
| 180 | |
| 181 | static int sb_eth_remove(struct udevice *dev) |
| 182 | { |
| 183 | return 0; |
| 184 | } |
| 185 | |
| 186 | static int sb_eth_ofdata_to_platdata(struct udevice *dev) |
| 187 | { |
| 188 | struct eth_pdata *pdata = dev_get_platdata(dev); |
| 189 | |
| 190 | pdata->iobase = dev_get_addr(dev); |
| 191 | return 0; |
| 192 | } |
| 193 | |
| 194 | static const struct udevice_id sb_eth_ids[] = { |
| 195 | { .compatible = "sandbox,eth" }, |
| 196 | { } |
| 197 | }; |
| 198 | |
| 199 | U_BOOT_DRIVER(eth_sandbox) = { |
| 200 | .name = "eth_sandbox", |
| 201 | .id = UCLASS_ETH, |
| 202 | .of_match = sb_eth_ids, |
| 203 | .ofdata_to_platdata = sb_eth_ofdata_to_platdata, |
| 204 | .remove = sb_eth_remove, |
| 205 | .ops = &sb_eth_ops, |
Joe Hershberger | e4d7cb1 | 2015-03-22 17:09:14 -0500 | [diff] [blame] | 206 | .priv_auto_alloc_size = sizeof(struct eth_sandbox_priv), |
Joe Hershberger | 6ab7699 | 2015-03-22 17:09:13 -0500 | [diff] [blame] | 207 | .platdata_auto_alloc_size = sizeof(struct eth_pdata), |
| 208 | }; |