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