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 NetLoop(NETCONS); /* wait for arp reply and send packet */ 188 output_packet_len = 0; 189 return; 190 } 191 192 if (eth->state != ETH_STATE_ACTIVE) { 193 if (eth_is_on_demand_init()) { 194 if (eth_init(gd->bd) < 0) 195 return; 196 eth_set_last_protocol(NETCONS); 197 } else 198 eth_init_state_only(gd->bd); 199 200 inited = 1; 201 } 202 pkt = (uchar *)NetTxPacket + NetEthHdrSize() + IP_UDP_HDR_SIZE; 203 memcpy(pkt, buf, len); 204 ether = nc_ether; 205 ip = nc_ip; 206 NetSendUDPPacket(ether, ip, nc_out_port, nc_in_port, len); 207 208 if (inited) { 209 if (eth_is_on_demand_init()) 210 eth_halt(); 211 else 212 eth_halt_state_only(); 213 } 214 } 215 216 static int nc_start(void) 217 { 218 int retval; 219 220 nc_out_port = 6666; /* default port */ 221 nc_in_port = nc_out_port; 222 223 retval = refresh_settings_from_env(); 224 if (retval != 0) 225 return retval; 226 227 /* 228 * Initialize the static IP settings and buffer pointers 229 * incase we call NetSendUDPPacket before NetLoop 230 */ 231 net_init(); 232 233 return 0; 234 } 235 236 static void nc_putc(char c) 237 { 238 if (output_recursion) 239 return; 240 output_recursion = 1; 241 242 nc_send_packet(&c, 1); 243 244 output_recursion = 0; 245 } 246 247 static void nc_puts(const char *s) 248 { 249 int len; 250 251 if (output_recursion) 252 return; 253 output_recursion = 1; 254 255 len = strlen(s); 256 while (len) { 257 int send_len = min(len, sizeof(input_buffer)); 258 nc_send_packet(s, send_len); 259 len -= send_len; 260 s += send_len; 261 } 262 263 output_recursion = 0; 264 } 265 266 static int nc_getc(void) 267 { 268 uchar c; 269 270 input_recursion = 1; 271 272 net_timeout = 0; /* no timeout */ 273 while (!input_size) 274 NetLoop(NETCONS); 275 276 input_recursion = 0; 277 278 c = input_buffer[input_offset++]; 279 280 if (input_offset >= sizeof(input_buffer)) 281 input_offset -= sizeof(input_buffer); 282 input_size--; 283 284 return c; 285 } 286 287 static int nc_tstc(void) 288 { 289 struct eth_device *eth; 290 291 if (input_recursion) 292 return 0; 293 294 if (input_size) 295 return 1; 296 297 eth = eth_get_dev(); 298 if (eth && eth->state == ETH_STATE_ACTIVE) 299 return 0; /* inside net loop */ 300 301 input_recursion = 1; 302 303 net_timeout = 1; 304 NetLoop(NETCONS); /* kind of poll */ 305 306 input_recursion = 0; 307 308 return input_size != 0; 309 } 310 311 int drv_nc_init(void) 312 { 313 struct stdio_dev dev; 314 int rc; 315 316 memset(&dev, 0, sizeof(dev)); 317 318 strcpy(dev.name, "nc"); 319 dev.flags = DEV_FLAGS_OUTPUT | DEV_FLAGS_INPUT | DEV_FLAGS_SYSTEM; 320 dev.start = nc_start; 321 dev.putc = nc_putc; 322 dev.puts = nc_puts; 323 dev.getc = nc_getc; 324 dev.tstc = nc_tstc; 325 326 rc = stdio_register(&dev); 327 328 return (rc == 0) ? 1 : rc; 329 } 330