drivers/net/netconsole.c

   1 /*
   2  * (C) Copyright 2004
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <common.h>
   9 #include <command.h>
  10 #include <stdio_dev.h>
  11 #include <net.h>
  12
  13 DECLARE_GLOBAL_DATA_PTR;
  14
  15 #ifndef CONFIG_NETCONSOLE_BUFFER_SIZE
  16 #define CONFIG_NETCONSOLE_BUFFER_SIZE 512
  17 #endif
  18
  19 static char input_buffer[CONFIG_NETCONSOLE_BUFFER_SIZE];
  20 static int input_size; /* char count in input buffer */
  21 static int input_offset; /* offset to valid chars in input buffer */
  22 static int input_recursion;
  23 static int output_recursion;
  24 static int net_timeout;
  25 static uchar nc_ether[6]; /* server enet address */
  26 static IPaddr_t nc_ip; /* server ip */
  27 static short nc_out_port; /* target output port */
  28 static short nc_in_port; /* source input port */
  29 static const char *output_packet; /* used by first send udp */
  30 static int output_packet_len;
  31 /*
  32  * Start with a default last protocol.
  33  * We are only interested in NETCONS or not.
  34  */
  35 enum proto_t net_loop_last_protocol = BOOTP;
  36
  37 static void nc_wait_arp_handler(uchar *pkt, unsigned dest,
  38                                  IPaddr_t sip, unsigned src,
  39                                  unsigned len)
  40 {
  41         net_set_state(NETLOOP_SUCCESS); /* got arp reply - quit net loop */
  42 }
  43
  44 static void nc_handler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src,
  45                         unsigned len)
  46 {
  47         if (input_size)
  48                 net_set_state(NETLOOP_SUCCESS); /* got input - quit net loop */
  49 }
  50
  51 static void nc_timeout(void)
  52 {
  53         net_set_state(NETLOOP_SUCCESS);
  54 }
  55
  56 static int is_broadcast(IPaddr_t ip)
  57 {
  58         static IPaddr_t netmask;
  59         static IPaddr_t our_ip;
  60         static int env_changed_id;
  61         int env_id = get_env_id();
  62
  63         /* update only when the environment has changed */
  64         if (env_changed_id != env_id) {
  65                 netmask = getenv_IPaddr("netmask");
  66                 our_ip = getenv_IPaddr("ipaddr");
  67
  68                 env_changed_id = env_id;
  69         }
  70
  71         return (ip == ~0 ||                             /* 255.255.255.255 */
  72             ((netmask & our_ip) == (netmask & ip) &&    /* on the same net */
  73             (netmask | ip) == ~0));             /* broadcast to our net */
  74 }
  75
  76 static int refresh_settings_from_env(void)
  77 {
  78         const char *p;
  79         static int env_changed_id;
  80         int env_id = get_env_id();
  81
  82         /* update only when the environment has changed */
  83         if (env_changed_id != env_id) {
  84                 if (getenv("ncip")) {
  85                         nc_ip = getenv_IPaddr("ncip");
  86                         if (!nc_ip)
  87                                 return -1;      /* ncip is 0.0.0.0 */
  88                         p = strchr(getenv("ncip"), ':');
  89                         if (p != NULL) {
  90                                 nc_out_port = simple_strtoul(p + 1, NULL, 10);
  91                                 nc_in_port = nc_out_port;
  92                         }
  93                 } else
  94                         nc_ip = ~0; /* ncip is not set, so broadcast */
  95
  96                 p = getenv("ncoutport");
  97                 if (p != NULL)
  98                         nc_out_port = simple_strtoul(p, NULL, 10);
  99                 p = getenv("ncinport");
 100                 if (p != NULL)
 101                         nc_in_port = simple_strtoul(p, NULL, 10);
 102
 103                 if (is_broadcast(nc_ip))
 104                         /* broadcast MAC address */
 105                         memset(nc_ether, 0xff, sizeof(nc_ether));
 106                 else
 107                         /* force arp request */
 108                         memset(nc_ether, 0, sizeof(nc_ether));
 109         }
 110         return 0;
 111 }
 112
 113 /**
 114  * Called from NetLoop in net/net.c before each packet
 115  */
 116 void NcStart(void)
 117 {
 118         refresh_settings_from_env();
 119         if (!output_packet_len || memcmp(nc_ether, NetEtherNullAddr, 6)) {
 120                 /* going to check for input packet */
 121                 net_set_udp_handler(nc_handler);
 122                 NetSetTimeout(net_timeout, nc_timeout);
 123         } else {
 124                 /* send arp request */
 125                 uchar *pkt;
 126                 net_set_arp_handler(nc_wait_arp_handler);
 127                 pkt = (uchar *)NetTxPacket + NetEthHdrSize() + IP_UDP_HDR_SIZE;
 128                 memcpy(pkt, output_packet, output_packet_len);
 129                 NetSendUDPPacket(nc_ether, nc_ip, nc_out_port, nc_in_port,
 130                         output_packet_len);
 131         }
 132 }
 133
 134 int nc_input_packet(uchar *pkt, IPaddr_t src_ip, unsigned dest_port,
 135         unsigned src_port, unsigned len)
 136 {
 137         int end, chunk;
 138
 139         if (dest_port != nc_in_port || !len)
 140                 return 0; /* not for us */
 141
 142         if (src_ip != nc_ip && !is_broadcast(nc_ip))
 143                 return 0; /* not from our client */
 144
 145         debug_cond(DEBUG_DEV_PKT, "input: \"%*.*s\"\n", len, len, pkt);
 146
 147         if (input_size == sizeof(input_buffer))
 148                 return 1; /* no space */
 149         if (len > sizeof(input_buffer) - input_size)
 150                 len = sizeof(input_buffer) - input_size;
 151
 152         end = input_offset + input_size;
 153         if (end > sizeof(input_buffer))
 154                 end -= sizeof(input_buffer);
 155
 156         chunk = len;
 157         if (end + len > sizeof(input_buffer)) {
 158                 chunk = sizeof(input_buffer) - end;
 159                 memcpy(input_buffer, pkt + chunk, len - chunk);
 160         }
 161         memcpy(input_buffer + end, pkt, chunk);
 162
 163         input_size += len;
 164
 165         return 1;
 166 }
 167
 168 static void nc_send_packet(const char *buf, int len)
 169 {
 170         struct eth_device *eth;
 171         int inited = 0;
 172         uchar *pkt;
 173         uchar *ether;
 174         IPaddr_t ip;
 175
 176         debug_cond(DEBUG_DEV_PKT, "output: \"%*.*s\"\n", len, len, buf);
 177
 178         eth = eth_get_dev();
 179         if (eth == NULL)
 180                 return;
 181
 182         if (!memcmp(nc_ether, NetEtherNullAddr, 6)) {
 183                 if (eth->state == ETH_STATE_ACTIVE)
 184                         return; /* inside net loop */
 185                 output_packet = buf;
 186                 output_packet_len = len;
 187                 input_recursion = 1;
 188                 NetLoop(NETCONS); /* wait for arp reply and send packet */
 189                 input_recursion = 0;
 190                 output_packet_len = 0;
 191                 return;
 192         }
 193
 194         if (eth->state != ETH_STATE_ACTIVE) {
 195                 if (eth_is_on_demand_init()) {
 196                         if (eth_init(gd->bd) < 0)
 197                                 return;
 198                         eth_set_last_protocol(NETCONS);
 199                 } else
 200                         eth_init_state_only(gd->bd);
 201
 202                 inited = 1;
 203         }
 204         pkt = (uchar *)NetTxPacket + NetEthHdrSize() + IP_UDP_HDR_SIZE;
 205         memcpy(pkt, buf, len);
 206         ether = nc_ether;
 207         ip = nc_ip;
 208         NetSendUDPPacket(ether, ip, nc_out_port, nc_in_port, len);
 209
 210         if (inited) {
 211                 if (eth_is_on_demand_init())
 212                         eth_halt();
 213                 else
 214                         eth_halt_state_only();
 215         }
 216 }
 217
 218 static int nc_start(struct stdio_dev *dev)
 219 {
 220         int retval;
 221
 222         nc_out_port = 6666; /* default port */
 223         nc_in_port = nc_out_port;
 224
 225         retval = refresh_settings_from_env();
 226         if (retval != 0)
 227                 return retval;
 228
 229         /*
 230          * Initialize the static IP settings and buffer pointers
 231          * incase we call NetSendUDPPacket before NetLoop
 232          */
 233         net_init();
 234
 235         return 0;
 236 }
 237
 238 static void nc_putc(struct stdio_dev *dev, char c)
 239 {
 240         if (output_recursion)
 241                 return;
 242         output_recursion = 1;
 243
 244         nc_send_packet(&c, 1);
 245
 246         output_recursion = 0;
 247 }
 248
 249 static void nc_puts(struct stdio_dev *dev, const char *s)
 250 {
 251         int len;
 252
 253         if (output_recursion)
 254                 return;
 255         output_recursion = 1;
 256
 257         len = strlen(s);
 258         while (len) {
 259                 int send_len = min(len, sizeof(input_buffer));
 260                 nc_send_packet(s, send_len);
 261                 len -= send_len;
 262                 s += send_len;
 263         }
 264
 265         output_recursion = 0;
 266 }
 267
 268 static int nc_getc(struct stdio_dev *dev)
 269 {
 270         uchar c;
 271
 272         input_recursion = 1;
 273
 274         net_timeout = 0;        /* no timeout */
 275         while (!input_size)
 276                 NetLoop(NETCONS);
 277
 278         input_recursion = 0;
 279
 280         c = input_buffer[input_offset++];
 281
 282         if (input_offset >= sizeof(input_buffer))
 283                 input_offset -= sizeof(input_buffer);
 284         input_size--;
 285
 286         return c;
 287 }
 288
 289 static int nc_tstc(struct stdio_dev *dev)
 290 {
 291         struct eth_device *eth;
 292
 293         if (input_recursion)
 294                 return 0;
 295
 296         if (input_size)
 297                 return 1;
 298
 299         eth = eth_get_dev();
 300         if (eth && eth->state == ETH_STATE_ACTIVE)
 301                 return 0;       /* inside net loop */
 302
 303         input_recursion = 1;
 304
 305         net_timeout = 1;
 306         NetLoop(NETCONS);       /* kind of poll */
 307
 308         input_recursion = 0;
 309
 310         return input_size != 0;
 311 }
 312
 313 int drv_nc_init(void)
 314 {
 315         struct stdio_dev dev;
 316         int rc;
 317
 318         memset(&dev, 0, sizeof(dev));
 319
 320         strcpy(dev.name, "nc");
 321         dev.flags = DEV_FLAGS_OUTPUT | DEV_FLAGS_INPUT | DEV_FLAGS_SYSTEM;
 322         dev.start = nc_start;
 323         dev.putc = nc_putc;
 324         dev.puts = nc_puts;
 325         dev.getc = nc_getc;
 326         dev.tstc = nc_tstc;
 327
 328         rc = stdio_register(&dev);
 329
 330         return (rc == 0) ? 1 : rc;
 331 }