drivers/net/netconsole.c

   1 /*
   2  * (C) Copyright 2004
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21  * MA 02111-1307 USA
  22  */
  23
  24 #include <common.h>
  25 #include <command.h>
  26 #include <stdio_dev.h>
  27 #include <net.h>
  28
  29 DECLARE_GLOBAL_DATA_PTR;
  30
  31 static char input_buffer[512];
  32 static int input_size; /* char count in input buffer */
  33 static int input_offset; /* offset to valid chars in input buffer */
  34 static int input_recursion;
  35 static int output_recursion;
  36 static int net_timeout;
  37 static uchar nc_ether[6]; /* server enet address */
  38 static IPaddr_t nc_ip; /* server ip */
  39 static short nc_port; /* source/target port */
  40 static const char *output_packet; /* used by first send udp */
  41 static int output_packet_len;
  42
  43 static void nc_wait_arp_handler(uchar *pkt, unsigned dest,
  44                                  IPaddr_t sip, unsigned src,
  45                                  unsigned len)
  46 {
  47         NetState = NETLOOP_SUCCESS; /* got arp reply - quit net loop */
  48 }
  49
  50 static void nc_handler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src,
  51                         unsigned len)
  52 {
  53         if (input_size)
  54                 NetState = NETLOOP_SUCCESS; /* got input - quit net loop */
  55 }
  56
  57 static void nc_timeout(void)
  58 {
  59         NetState = NETLOOP_SUCCESS;
  60 }
  61
  62 void NcStart(void)
  63 {
  64         if (!output_packet_len || memcmp(nc_ether, NetEtherNullAddr, 6)) {
  65                 /* going to check for input packet */
  66                 NetSetHandler(nc_handler);
  67                 NetSetTimeout(net_timeout, nc_timeout);
  68         } else {
  69                 /* send arp request */
  70                 uchar *pkt;
  71                 NetSetHandler(nc_wait_arp_handler);
  72                 pkt = (uchar *)NetTxPacket + NetEthHdrSize() + IP_HDR_SIZE;
  73                 memcpy(pkt, output_packet, output_packet_len);
  74                 NetSendUDPPacket(nc_ether, nc_ip, nc_port, nc_port,
  75                         output_packet_len);
  76         }
  77 }
  78
  79 int nc_input_packet(uchar *pkt, unsigned dest, unsigned src, unsigned len)
  80 {
  81         int end, chunk;
  82
  83         if (dest != nc_port || !len)
  84                 return 0; /* not for us */
  85
  86         if (input_size == sizeof(input_buffer))
  87                 return 1; /* no space */
  88         if (len > sizeof(input_buffer) - input_size)
  89                 len = sizeof(input_buffer) - input_size;
  90
  91         end = input_offset + input_size;
  92         if (end > sizeof(input_buffer))
  93                 end -= sizeof(input_buffer);
  94
  95         chunk = len;
  96         if (end + len > sizeof(input_buffer)) {
  97                 chunk = sizeof(input_buffer) - end;
  98                 memcpy(input_buffer, pkt + chunk, len - chunk);
  99         }
 100         memcpy(input_buffer + end, pkt, chunk);
 101
 102         input_size += len;
 103
 104         return 1;
 105 }
 106
 107 static void nc_send_packet(const char *buf, int len)
 108 {
 109         struct eth_device *eth;
 110         int inited = 0;
 111         uchar *pkt;
 112         uchar *ether;
 113         IPaddr_t ip;
 114
 115         eth = eth_get_dev();
 116         if (eth == NULL)
 117                 return;
 118
 119         if (!memcmp(nc_ether, NetEtherNullAddr, 6)) {
 120                 if (eth->state == ETH_STATE_ACTIVE)
 121                         return; /* inside net loop */
 122                 output_packet = buf;
 123                 output_packet_len = len;
 124                 NetLoop(NETCONS); /* wait for arp reply and send packet */
 125                 output_packet_len = 0;
 126                 return;
 127         }
 128
 129         if (eth->state != ETH_STATE_ACTIVE) {
 130                 if (eth_init(gd->bd) < 0)
 131                         return;
 132                 inited = 1;
 133         }
 134         pkt = (uchar *)NetTxPacket + NetEthHdrSize() + IP_HDR_SIZE;
 135         memcpy(pkt, buf, len);
 136         ether = nc_ether;
 137         ip = nc_ip;
 138         NetSendUDPPacket(ether, ip, nc_port, nc_port, len);
 139
 140         if (inited)
 141                 eth_halt();
 142 }
 143
 144 static int nc_start(void)
 145 {
 146         int netmask, our_ip;
 147
 148         nc_port = 6666;         /* default port */
 149
 150         if (getenv("ncip")) {
 151                 char *p;
 152
 153                 nc_ip = getenv_IPaddr("ncip");
 154                 if (!nc_ip)
 155                         return -1;      /* ncip is 0.0.0.0 */
 156                 p = strchr(getenv("ncip"), ':');
 157                 if (p != NULL)
 158                         nc_port = simple_strtoul(p + 1, NULL, 10);
 159         } else
 160                 nc_ip = ~0;             /* ncip is not set */
 161
 162         our_ip = getenv_IPaddr("ipaddr");
 163         netmask = getenv_IPaddr("netmask");
 164
 165         if (nc_ip == ~0 ||                              /* 255.255.255.255 */
 166             ((netmask & our_ip) == (netmask & nc_ip) && /* on the same net */
 167             (netmask | nc_ip) == ~0))           /* broadcast to our net */
 168                 memset(nc_ether, 0xff, sizeof(nc_ether));
 169         else
 170                 memset(nc_ether, 0, sizeof(nc_ether));  /* force arp request */
 171
 172         return 0;
 173 }
 174
 175 static void nc_putc(char c)
 176 {
 177         if (output_recursion)
 178                 return;
 179         output_recursion = 1;
 180
 181         nc_send_packet(&c, 1);
 182
 183         output_recursion = 0;
 184 }
 185
 186 static void nc_puts(const char *s)
 187 {
 188         int len;
 189
 190         if (output_recursion)
 191                 return;
 192         output_recursion = 1;
 193
 194         len = strlen(s);
 195         while (len) {
 196                 int send_len = min(len, 512);
 197                 nc_send_packet(s, send_len);
 198                 len -= send_len;
 199                 s += send_len;
 200         }
 201
 202         output_recursion = 0;
 203 }
 204
 205 static int nc_getc(void)
 206 {
 207         uchar c;
 208
 209         input_recursion = 1;
 210
 211         net_timeout = 0;        /* no timeout */
 212         while (!input_size)
 213                 NetLoop(NETCONS);
 214
 215         input_recursion = 0;
 216
 217         c = input_buffer[input_offset++];
 218
 219         if (input_offset >= sizeof(input_buffer))
 220                 input_offset -= sizeof(input_buffer);
 221         input_size--;
 222
 223         return c;
 224 }
 225
 226 static int nc_tstc(void)
 227 {
 228         struct eth_device *eth;
 229
 230         if (input_recursion)
 231                 return 0;
 232
 233         if (input_size)
 234                 return 1;
 235
 236         eth = eth_get_dev();
 237         if (eth && eth->state == ETH_STATE_ACTIVE)
 238                 return 0;       /* inside net loop */
 239
 240         input_recursion = 1;
 241
 242         net_timeout = 1;
 243         NetLoop(NETCONS);       /* kind of poll */
 244
 245         input_recursion = 0;
 246
 247         return input_size != 0;
 248 }
 249
 250 int drv_nc_init(void)
 251 {
 252         struct stdio_dev dev;
 253         int rc;
 254
 255         memset(&dev, 0, sizeof(dev));
 256
 257         strcpy(dev.name, "nc");
 258         dev.flags = DEV_FLAGS_OUTPUT | DEV_FLAGS_INPUT | DEV_FLAGS_SYSTEM;
 259         dev.start = nc_start;
 260         dev.putc = nc_putc;
 261         dev.puts = nc_puts;
 262         dev.getc = nc_getc;
 263         dev.tstc = nc_tstc;
 264
 265         rc = stdio_register(&dev);
 266
 267         return (rc == 0) ? 1 : rc;
 268 }