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 } 342