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 #ifndef CONFIG_NETCONSOLE_BUFFER_SIZE
  32 #define CONFIG_NETCONSOLE_BUFFER_SIZE 512
  33 #endif
  34
  35 static char input_buffer[CONFIG_NETCONSOLE_BUFFER_SIZE];
  36 static int input_size; /* char count in input buffer */
  37 static int input_offset; /* offset to valid chars in input buffer */
  38 static int input_recursion;
  39 static int output_recursion;
  40 static int net_timeout;
  41 static uchar nc_ether[6]; /* server enet address */
  42 static IPaddr_t nc_ip; /* server ip */
  43 static short nc_out_port; /* target output port */
  44 static short nc_in_port; /* source input port */
  45 static const char *output_packet; /* used by first send udp */
  46 static int output_packet_len;
  47 /*
  48  * Start with a default last protocol.
  49  * We are only interested in NETCONS or not.
  50  */
  51 enum proto_t net_loop_last_protocol = BOOTP;
  52
  53 static void nc_wait_arp_handler(uchar *pkt, unsigned dest,
  54                                  IPaddr_t sip, unsigned src,
  55                                  unsigned len)
  56 {
  57         net_set_state(NETLOOP_SUCCESS); /* got arp reply - quit net loop */
  58 }
  59
  60 static void nc_handler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src,
  61                         unsigned len)
  62 {
  63         if (input_size)
  64                 net_set_state(NETLOOP_SUCCESS); /* got input - quit net loop */
  65 }
  66
  67 static void nc_timeout(void)
  68 {
  69         net_set_state(NETLOOP_SUCCESS);
  70 }
  71
  72 static int is_broadcast(IPaddr_t ip)
  73 {
  74         static IPaddr_t netmask;
  75         static IPaddr_t our_ip;
  76         static int env_changed_id;
  77         int env_id = get_env_id();
  78
  79         /* update only when the environment has changed */
  80         if (env_changed_id != env_id) {
  81                 netmask = getenv_IPaddr("netmask");
  82                 our_ip = getenv_IPaddr("ipaddr");
  83
  84                 env_changed_id = env_id;
  85         }
  86
  87         return (ip == ~0 ||                             /* 255.255.255.255 */
  88             ((netmask & our_ip) == (netmask & ip) &&    /* on the same net */
  89             (netmask | ip) == ~0));             /* broadcast to our net */
  90 }
  91
  92 static int refresh_settings_from_env(void)
  93 {
  94         const char *p;
  95         static int env_changed_id;
  96         int env_id = get_env_id();
  97
  98         /* update only when the environment has changed */
  99         if (env_changed_id != env_id) {
 100                 if (getenv("ncip")) {
 101                         nc_ip = getenv_IPaddr("ncip");
 102                         if (!nc_ip)
 103                                 return -1;      /* ncip is 0.0.0.0 */
 104                         p = strchr(getenv("ncip"), ':');
 105                         if (p != NULL) {
 106                                 nc_out_port = simple_strtoul(p + 1, NULL, 10);
 107                                 nc_in_port = nc_out_port;
 108                         }
 109                 } else
 110                         nc_ip = ~0; /* ncip is not set, so broadcast */
 111
 112                 p = getenv("ncoutport");
 113                 if (p != NULL)
 114                         nc_out_port = simple_strtoul(p, NULL, 10);
 115                 p = getenv("ncinport");
 116                 if (p != NULL)
 117                         nc_in_port = simple_strtoul(p, NULL, 10);
 118
 119                 if (is_broadcast(nc_ip))
 120                         /* broadcast MAC address */
 121                         memset(nc_ether, 0xff, sizeof(nc_ether));
 122                 else
 123                         /* force arp request */
 124                         memset(nc_ether, 0, sizeof(nc_ether));
 125         }
 126         return 0;
 127 }
 128
 129 /**
 130  * Called from NetLoop in net/net.c before each packet
 131  */
 132 void NcStart(void)
 133 {
 134         refresh_settings_from_env();
 135         if (!output_packet_len || memcmp(nc_ether, NetEtherNullAddr, 6)) {
 136                 /* going to check for input packet */
 137                 net_set_udp_handler(nc_handler);
 138                 NetSetTimeout(net_timeout, nc_timeout);
 139         } else {
 140                 /* send arp request */
 141                 uchar *pkt;
 142                 net_set_arp_handler(nc_wait_arp_handler);
 143                 pkt = (uchar *)NetTxPacket + NetEthHdrSize() + IP_UDP_HDR_SIZE;
 144                 memcpy(pkt, output_packet, output_packet_len);
 145                 NetSendUDPPacket(nc_ether, nc_ip, nc_out_port, nc_in_port,
 146                         output_packet_len);
 147         }
 148 }
 149
 150 int nc_input_packet(uchar *pkt, unsigned dest, unsigned src, unsigned len)
 151 {
 152         int end, chunk;
 153
 154         if (dest != nc_in_port || !len)
 155                 return 0; /* not for us */
 156
 157         debug_cond(DEBUG_DEV_PKT, "input: \"%*.*s\"\n", len, len, pkt);
 158
 159         if (input_size == sizeof(input_buffer))
 160                 return 1; /* no space */
 161         if (len > sizeof(input_buffer) - input_size)
 162                 len = sizeof(input_buffer) - input_size;
 163
 164         end = input_offset + input_size;
 165         if (end > sizeof(input_buffer))
 166                 end -= sizeof(input_buffer);
 167
 168         chunk = len;
 169         if (end + len > sizeof(input_buffer)) {
 170                 chunk = sizeof(input_buffer) - end;
 171                 memcpy(input_buffer, pkt + chunk, len - chunk);
 172         }
 173         memcpy(input_buffer + end, pkt, chunk);
 174
 175         input_size += len;
 176
 177         return 1;
 178 }
 179
 180 static void nc_send_packet(const char *buf, int len)
 181 {
 182         struct eth_device *eth;
 183         int inited = 0;
 184         uchar *pkt;
 185         uchar *ether;
 186         IPaddr_t ip;
 187
 188         debug_cond(DEBUG_DEV_PKT, "output: \"%*.*s\"\n", len, len, buf);
 189
 190         eth = eth_get_dev();
 191         if (eth == NULL)
 192                 return;
 193
 194         if (!memcmp(nc_ether, NetEtherNullAddr, 6)) {
 195                 if (eth->state == ETH_STATE_ACTIVE)
 196                         return; /* inside net loop */
 197                 output_packet = buf;
 198                 output_packet_len = len;
 199                 NetLoop(NETCONS); /* wait for arp reply and send packet */
 200                 output_packet_len = 0;
 201                 return;
 202         }
 203
 204         if (eth->state != ETH_STATE_ACTIVE) {
 205                 if (eth_is_on_demand_init()) {
 206                         if (eth_init(gd->bd) < 0)
 207                                 return;
 208                         eth_set_last_protocol(NETCONS);
 209                 } else
 210                         eth_init_state_only(gd->bd);
 211
 212                 inited = 1;
 213         }
 214         pkt = (uchar *)NetTxPacket + NetEthHdrSize() + IP_UDP_HDR_SIZE;
 215         memcpy(pkt, buf, len);
 216         ether = nc_ether;
 217         ip = nc_ip;
 218         NetSendUDPPacket(ether, ip, nc_out_port, nc_in_port, len);
 219
 220         if (inited) {
 221                 if (eth_is_on_demand_init())
 222                         eth_halt();
 223                 else
 224                         eth_halt_state_only();
 225         }
 226 }
 227
 228 static int nc_start(void)
 229 {
 230         int retval;
 231
 232         nc_out_port = 6666; /* default port */
 233         nc_in_port = nc_out_port;
 234
 235         retval = refresh_settings_from_env();
 236         if (retval != 0)
 237                 return retval;
 238
 239         /*
 240          * Initialize the static IP settings and buffer pointers
 241          * incase we call NetSendUDPPacket before NetLoop
 242          */
 243         net_init();
 244
 245         return 0;
 246 }
 247
 248 static void nc_putc(char c)
 249 {
 250         if (output_recursion)
 251                 return;
 252         output_recursion = 1;
 253
 254         nc_send_packet(&c, 1);
 255
 256         output_recursion = 0;
 257 }
 258
 259 static void nc_puts(const char *s)
 260 {
 261         int len;
 262
 263         if (output_recursion)
 264                 return;
 265         output_recursion = 1;
 266
 267         len = strlen(s);
 268         while (len) {
 269                 int send_len = min(len, sizeof(input_buffer));
 270                 nc_send_packet(s, send_len);
 271                 len -= send_len;
 272                 s += send_len;
 273         }
 274
 275         output_recursion = 0;
 276 }
 277
 278 static int nc_getc(void)
 279 {
 280         uchar c;
 281
 282         input_recursion = 1;
 283
 284         net_timeout = 0;        /* no timeout */
 285         while (!input_size)
 286                 NetLoop(NETCONS);
 287
 288         input_recursion = 0;
 289
 290         c = input_buffer[input_offset++];
 291
 292         if (input_offset >= sizeof(input_buffer))
 293                 input_offset -= sizeof(input_buffer);
 294         input_size--;
 295
 296         return c;
 297 }
 298
 299 static int nc_tstc(void)
 300 {
 301         struct eth_device *eth;
 302
 303         if (input_recursion)
 304                 return 0;
 305
 306         if (input_size)
 307                 return 1;
 308
 309         eth = eth_get_dev();
 310         if (eth && eth->state == ETH_STATE_ACTIVE)
 311                 return 0;       /* inside net loop */
 312
 313         input_recursion = 1;
 314
 315         net_timeout = 1;
 316         NetLoop(NETCONS);       /* kind of poll */
 317
 318         input_recursion = 0;
 319
 320         return input_size != 0;
 321 }
 322
 323 int drv_nc_init(void)
 324 {
 325         struct stdio_dev dev;
 326         int rc;
 327
 328         memset(&dev, 0, sizeof(dev));
 329
 330         strcpy(dev.name, "nc");
 331         dev.flags = DEV_FLAGS_OUTPUT | DEV_FLAGS_INPUT | DEV_FLAGS_SYSTEM;
 332         dev.start = nc_start;
 333         dev.putc = nc_putc;
 334         dev.puts = nc_puts;
 335         dev.getc = nc_getc;
 336         dev.tstc = nc_tstc;
 337
 338         rc = stdio_register(&dev);
 339
 340         return (rc == 0) ? 1 : rc;
 341 }