drivers/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
  26 #ifdef CONFIG_NETCONSOLE
  27
  28 #include <command.h>
  29 #include <devices.h>
  30 #include <net.h>
  31
  32 DECLARE_GLOBAL_DATA_PTR;
  33
  34 static char input_buffer[512];
  35 static int input_size = 0;              /* char count in input buffer */
  36 static int input_offset = 0;            /* offset to valid chars in input buffer */
  37 static int input_recursion = 0;
  38 static int output_recursion = 0;
  39 static int net_timeout;
  40 static uchar nc_ether[6];               /* server enet address */
  41 static IPaddr_t nc_ip;                  /* server ip */
  42 static short nc_port;                   /* source/target port */
  43 static const char *output_packet;       /* used by first send udp */
  44 static int output_packet_len = 0;
  45
  46 static void nc_wait_arp_handler (uchar * pkt, unsigned dest, unsigned src,
  47                                  unsigned len)
  48 {
  49         NetState = NETLOOP_SUCCESS;     /* got arp reply - quit net loop */
  50 }
  51
  52 static void nc_handler (uchar * pkt, unsigned dest, unsigned src,
  53                         unsigned len)
  54 {
  55         if (input_size)
  56                 NetState = NETLOOP_SUCCESS;     /* got input - quit net loop */
  57 }
  58
  59 static void nc_timeout (void)
  60 {
  61         NetState = NETLOOP_SUCCESS;
  62 }
  63
  64 void NcStart (void)
  65 {
  66         if (!output_packet_len || memcmp (nc_ether, NetEtherNullAddr, 6)) {
  67                 /* going to check for input packet */
  68                 NetSetHandler (nc_handler);
  69                 NetSetTimeout (net_timeout, nc_timeout);
  70         } else {
  71                 /* send arp request */
  72                 uchar *pkt;
  73                 NetSetHandler (nc_wait_arp_handler);
  74                 pkt = (uchar *) NetTxPacket + NetEthHdrSize () + IP_HDR_SIZE;
  75                 memcpy (pkt, output_packet, output_packet_len);
  76                 NetSendUDPPacket (nc_ether, nc_ip, nc_port, nc_port, output_packet_len);
  77         }
  78 }
  79
  80 int nc_input_packet (uchar * pkt, unsigned dest, unsigned src, unsigned len)
  81 {
  82         int end, chunk;
  83
  84         if (dest != nc_port || !len)
  85                 return 0;               /* not for us */
  86
  87         if (input_size == sizeof input_buffer)
  88                 return 1;               /* no space */
  89         if (len > sizeof input_buffer - input_size)
  90                 len = sizeof input_buffer - input_size;
  91
  92         end = input_offset + input_size;
  93         if (end > sizeof input_buffer)
  94                 end -= sizeof input_buffer;
  95
  96         chunk = len;
  97         if (end + len > sizeof input_buffer) {
  98                 chunk = sizeof input_buffer - end;
  99                 memcpy(input_buffer, pkt + chunk, len - chunk);
 100         }
 101         memcpy (input_buffer + end, pkt, chunk);
 102
 103         input_size += len;
 104
 105         return 1;
 106 }
 107
 108 static void nc_send_packet (const char *buf, int len)
 109 {
 110         struct eth_device *eth;
 111         int inited = 0;
 112         uchar *pkt;
 113         uchar *ether;
 114         IPaddr_t ip;
 115
 116         if ((eth = eth_get_dev ()) == NULL) {
 117                 return;
 118         }
 119
 120         if (!memcmp (nc_ether, NetEtherNullAddr, 6)) {
 121                 if (eth->state == ETH_STATE_ACTIVE)
 122                         return; /* inside net loop */
 123                 output_packet = buf;
 124                 output_packet_len = len;
 125                 NetLoop (NETCONS);      /* wait for arp reply and send packet */
 126                 output_packet_len = 0;
 127                 return;
 128         }
 129
 130         if (eth->state != ETH_STATE_ACTIVE) {
 131                 if (eth_init (gd->bd) < 0)
 132                         return;
 133                 inited = 1;
 134         }
 135         pkt = (uchar *) NetTxPacket + NetEthHdrSize () + IP_HDR_SIZE;
 136         memcpy (pkt, buf, len);
 137         ether = nc_ether;
 138         ip = nc_ip;
 139         NetSendUDPPacket (ether, ip, nc_port, nc_port, len);
 140
 141         if (inited)
 142                 eth_halt ();
 143 }
 144
 145 int nc_start (void)
 146 {
 147         int netmask, our_ip;
 148
 149         nc_port = 6666;         /* default port */
 150
 151         if (getenv ("ncip")) {
 152                 char *p;
 153
 154                 nc_ip = getenv_IPaddr ("ncip");
 155                 if (!nc_ip)
 156                         return -1;      /* ncip is 0.0.0.0 */
 157                 if ((p = strchr (getenv ("ncip"), ':')) != 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 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 void nc_puts (const char *s)
 187 {
 188         int len;
 189
 190         if (output_recursion)
 191                 return;
 192         output_recursion = 1;
 193
 194         if ((len = strlen (s)) > 512)
 195                 len = 512;
 196
 197         nc_send_packet (s, len);
 198
 199         output_recursion = 0;
 200 }
 201
 202 int nc_getc (void)
 203 {
 204         uchar c;
 205
 206         input_recursion = 1;
 207
 208         net_timeout = 0;        /* no timeout */
 209         while (!input_size)
 210                 NetLoop (NETCONS);
 211
 212         input_recursion = 0;
 213
 214         c = input_buffer[input_offset++];
 215
 216         if (input_offset >= sizeof input_buffer)
 217                 input_offset -= sizeof input_buffer;
 218         input_size--;
 219
 220         return c;
 221 }
 222
 223 int nc_tstc (void)
 224 {
 225         struct eth_device *eth;
 226
 227         if (input_recursion)
 228                 return 0;
 229
 230         if (input_size)
 231                 return 1;
 232
 233         eth = eth_get_dev ();
 234         if (eth && eth->state == ETH_STATE_ACTIVE)
 235                 return 0;       /* inside net loop */
 236
 237         input_recursion = 1;
 238
 239         net_timeout = 1;
 240         NetLoop (NETCONS);      /* kind of poll */
 241
 242         input_recursion = 0;
 243
 244         return input_size != 0;
 245 }
 246
 247 int drv_nc_init (void)
 248 {
 249         device_t dev;
 250         int rc;
 251
 252         memset (&dev, 0, sizeof (dev));
 253
 254         strcpy (dev.name, "nc");
 255         dev.flags = DEV_FLAGS_OUTPUT | DEV_FLAGS_INPUT | DEV_FLAGS_SYSTEM;
 256         dev.start = nc_start;
 257         dev.putc = nc_putc;
 258         dev.puts = nc_puts;
 259         dev.getc = nc_getc;
 260         dev.tstc = nc_tstc;
 261
 262         rc = device_register (&dev);
 263
 264         return (rc == 0) ? 1 : rc;
 265 }
 266
 267 #endif  /* CONFIG_NETCONSOLE */