drivers/net/sandbox.c

   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 #include <asm/test.h>
  15
  16 DECLARE_GLOBAL_DATA_PTR;
  17
  18 /**
  19  * struct eth_sandbox_priv - memory for sandbox mock driver
  20  *
  21  * fake_host_hwaddr: MAC address of mocked machine
  22  * fake_host_ipaddr: IP address of mocked machine
  23  * recv_packet_buffer: buffer of the packet returned as received
  24  * recv_packet_length: length of the packet returned as received
  25  */
  26 struct eth_sandbox_priv {
  27         uchar fake_host_hwaddr[ARP_HLEN];
  28         struct in_addr fake_host_ipaddr;
  29         uchar *recv_packet_buffer;
  30         int recv_packet_length;
  31 };
  32
  33 static bool disabled[8] = {false};
  34 static bool skip_timeout;
  35
  36 /*
  37  * sandbox_eth_disable_response()
  38  *
  39  * index - The alias index (also DM seq number)
  40  * disable - If non-zero, ignore sent packets and don't send mock response
  41  */
  42 void sandbox_eth_disable_response(int index, bool disable)
  43 {
  44         disabled[index] = disable;
  45 }
  46
  47 /*
  48  * sandbox_eth_skip_timeout()
  49  *
  50  * When the first packet read is attempted, fast-forward time
  51  */
  52 void sandbox_eth_skip_timeout(void)
  53 {
  54         skip_timeout = true;
  55 }
  56
  57 static int sb_eth_start(struct udevice *dev)
  58 {
  59         struct eth_sandbox_priv *priv = dev_get_priv(dev);
  60
  61         debug("eth_sandbox: Start\n");
  62
  63         fdtdec_get_byte_array(gd->fdt_blob, dev->of_offset, "fake-host-hwaddr",
  64                               priv->fake_host_hwaddr, ARP_HLEN);
  65         priv->recv_packet_buffer = net_rx_packets[0];
  66         return 0;
  67 }
  68
  69 static int sb_eth_send(struct udevice *dev, void *packet, int length)
  70 {
  71         struct eth_sandbox_priv *priv = dev_get_priv(dev);
  72         struct ethernet_hdr *eth = packet;
  73
  74         debug("eth_sandbox: Send packet %d\n", length);
  75
  76         if (dev->seq >= 0 && dev->seq < ARRAY_SIZE(disabled) &&
  77             disabled[dev->seq])
  78                 return 0;
  79
  80         if (ntohs(eth->et_protlen) == PROT_ARP) {
  81                 struct arp_hdr *arp = packet + ETHER_HDR_SIZE;
  82
  83                 if (ntohs(arp->ar_op) == ARPOP_REQUEST) {
  84                         struct ethernet_hdr *eth_recv;
  85                         struct arp_hdr *arp_recv;
  86
  87                         /* store this as the assumed IP of the fake host */
  88                         priv->fake_host_ipaddr = net_read_ip(&arp->ar_tpa);
  89                         /* Formulate a fake response */
  90                         eth_recv = (void *)priv->recv_packet_buffer;
  91                         memcpy(eth_recv->et_dest, eth->et_src, ARP_HLEN);
  92                         memcpy(eth_recv->et_src, priv->fake_host_hwaddr,
  93                                ARP_HLEN);
  94                         eth_recv->et_protlen = htons(PROT_ARP);
  95
  96                         arp_recv = (void *)priv->recv_packet_buffer +
  97                                 ETHER_HDR_SIZE;
  98                         arp_recv->ar_hrd = htons(ARP_ETHER);
  99                         arp_recv->ar_pro = htons(PROT_IP);
 100                         arp_recv->ar_hln = ARP_HLEN;
 101                         arp_recv->ar_pln = ARP_PLEN;
 102                         arp_recv->ar_op = htons(ARPOP_REPLY);
 103                         memcpy(&arp_recv->ar_sha, priv->fake_host_hwaddr,
 104                                ARP_HLEN);
 105                         net_write_ip(&arp_recv->ar_spa, priv->fake_host_ipaddr);
 106                         memcpy(&arp_recv->ar_tha, &arp->ar_sha, ARP_HLEN);
 107                         net_copy_ip(&arp_recv->ar_tpa, &arp->ar_spa);
 108
 109                         priv->recv_packet_length = ETHER_HDR_SIZE +
 110                                 ARP_HDR_SIZE;
 111                 }
 112         } else if (ntohs(eth->et_protlen) == PROT_IP) {
 113                 struct ip_udp_hdr *ip = packet + ETHER_HDR_SIZE;
 114
 115                 if (ip->ip_p == IPPROTO_ICMP) {
 116                         struct icmp_hdr *icmp = (struct icmp_hdr *)&ip->udp_src;
 117
 118                         if (icmp->type == ICMP_ECHO_REQUEST) {
 119                                 struct ethernet_hdr *eth_recv;
 120                                 struct ip_udp_hdr *ipr;
 121                                 struct icmp_hdr *icmpr;
 122
 123                                 /* reply to the ping */
 124                                 memcpy(priv->recv_packet_buffer, packet,
 125                                        length);
 126                                 eth_recv = (void *)priv->recv_packet_buffer;
 127                                 ipr = (void *)priv->recv_packet_buffer +
 128                                         ETHER_HDR_SIZE;
 129                                 icmpr = (struct icmp_hdr *)&ipr->udp_src;
 130                                 memcpy(eth_recv->et_dest, eth->et_src,
 131                                        ARP_HLEN);
 132                                 memcpy(eth_recv->et_src, priv->fake_host_hwaddr,
 133                                        ARP_HLEN);
 134                                 ipr->ip_sum = 0;
 135                                 ipr->ip_off = 0;
 136                                 net_copy_ip((void *)&ipr->ip_dst, &ip->ip_src);
 137                                 net_write_ip((void *)&ipr->ip_src,
 138                                              priv->fake_host_ipaddr);
 139                                 ipr->ip_sum = compute_ip_checksum(ipr,
 140                                         IP_HDR_SIZE);
 141
 142                                 icmpr->type = ICMP_ECHO_REPLY;
 143                                 icmpr->checksum = 0;
 144                                 icmpr->checksum = compute_ip_checksum(icmpr,
 145                                         ICMP_HDR_SIZE);
 146
 147                                 priv->recv_packet_length = length;
 148                         }
 149                 }
 150         }
 151
 152         return 0;
 153 }
 154
 155 static int sb_eth_recv(struct udevice *dev, int flags, uchar **packetp)
 156 {
 157         struct eth_sandbox_priv *priv = dev_get_priv(dev);
 158
 159         if (skip_timeout) {
 160                 sandbox_timer_add_offset(10000UL);
 161                 skip_timeout = false;
 162         }
 163
 164         if (priv->recv_packet_length) {
 165                 int lcl_recv_packet_length = priv->recv_packet_length;
 166
 167                 debug("eth_sandbox: received packet %d\n",
 168                       priv->recv_packet_length);
 169                 priv->recv_packet_length = 0;
 170                 *packetp = priv->recv_packet_buffer;
 171                 return lcl_recv_packet_length;
 172         }
 173         return 0;
 174 }
 175
 176 static void sb_eth_stop(struct udevice *dev)
 177 {
 178         debug("eth_sandbox: Stop\n");
 179 }
 180
 181 static int sb_eth_write_hwaddr(struct udevice *dev)
 182 {
 183         struct eth_pdata *pdata = dev_get_platdata(dev);
 184
 185         debug("eth_sandbox %s: Write HW ADDR - %pM\n", dev->name,
 186               pdata->enetaddr);
 187         return 0;
 188 }
 189
 190 static const struct eth_ops sb_eth_ops = {
 191         .start                  = sb_eth_start,
 192         .send                   = sb_eth_send,
 193         .recv                   = sb_eth_recv,
 194         .stop                   = sb_eth_stop,
 195         .write_hwaddr           = sb_eth_write_hwaddr,
 196 };
 197
 198 static int sb_eth_remove(struct udevice *dev)
 199 {
 200         return 0;
 201 }
 202
 203 static int sb_eth_ofdata_to_platdata(struct udevice *dev)
 204 {
 205         struct eth_pdata *pdata = dev_get_platdata(dev);
 206
 207         pdata->iobase = dev_get_addr(dev);
 208         return 0;
 209 }
 210
 211 static const struct udevice_id sb_eth_ids[] = {
 212         { .compatible = "sandbox,eth" },
 213         { }
 214 };
 215
 216 U_BOOT_DRIVER(eth_sandbox) = {
 217         .name   = "eth_sandbox",
 218         .id     = UCLASS_ETH,
 219         .of_match = sb_eth_ids,
 220         .ofdata_to_platdata = sb_eth_ofdata_to_platdata,
 221         .remove = sb_eth_remove,
 222         .ops    = &sb_eth_ops,
 223         .priv_auto_alloc_size = sizeof(struct eth_sandbox_priv),
 224         .platdata_auto_alloc_size = sizeof(struct eth_pdata),
 225 };