// SPDX-License-Identifier: GPL-2.0+ /* * (C) Copyright 2004 * Wolfgang Denk, DENX Software Engineering, wd@denx.de. */ #include #include #include #include #include #include #ifndef CFG_NETCONSOLE_BUFFER_SIZE #define CFG_NETCONSOLE_BUFFER_SIZE 512 #endif static char input_buffer[CFG_NETCONSOLE_BUFFER_SIZE]; static int input_size; /* char count in input buffer */ static int input_offset; /* offset to valid chars in input buffer */ static int input_recursion; static int output_recursion; static int net_timeout; static uchar nc_ether[6]; /* server enet address */ static struct in_addr nc_ip; /* server ip */ static short nc_out_port; /* target output port */ static short nc_in_port; /* source input port */ static const char *output_packet; /* used by first send udp */ static int output_packet_len; /* * Start with a default last protocol. * We are only interested in NETCONS or not. */ enum proto_t net_loop_last_protocol = BOOTP; static void nc_wait_arp_handler(uchar *pkt, unsigned dest, struct in_addr sip, unsigned src, unsigned len) { net_set_state(NETLOOP_SUCCESS); /* got arp reply - quit net loop */ } static void nc_handler(uchar *pkt, unsigned dest, struct in_addr sip, unsigned src, unsigned len) { if (input_size) net_set_state(NETLOOP_SUCCESS); /* got input - quit net loop */ } static void nc_timeout_handler(void) { net_set_state(NETLOOP_SUCCESS); } static int is_broadcast(struct in_addr ip) { static struct in_addr netmask; static struct in_addr our_ip; static int env_changed_id; int env_id = env_get_id(); /* update only when the environment has changed */ if (env_changed_id != env_id) { netmask = env_get_ip("netmask"); our_ip = env_get_ip("ipaddr"); env_changed_id = env_id; } return (ip.s_addr == ~0 || /* 255.255.255.255 (global bcast) */ ((netmask.s_addr & our_ip.s_addr) == (netmask.s_addr & ip.s_addr) && /* on the same net and */ (netmask.s_addr | ip.s_addr) == ~0)); /* bcast to our net */ } static int refresh_settings_from_env(void) { const char *p; static int env_changed_id; int env_id = env_get_id(); /* update only when the environment has changed */ if (env_changed_id != env_id) { if (env_get("ncip")) { nc_ip = env_get_ip("ncip"); if (!nc_ip.s_addr) return -1; /* ncip is 0.0.0.0 */ p = strchr(env_get("ncip"), ':'); if (p != NULL) { nc_out_port = dectoul(p + 1, NULL); nc_in_port = nc_out_port; } } else { nc_ip.s_addr = ~0; /* ncip is not set, so broadcast */ } p = env_get("ncoutport"); if (p != NULL) nc_out_port = dectoul(p, NULL); p = env_get("ncinport"); if (p != NULL) nc_in_port = dectoul(p, NULL); if (is_broadcast(nc_ip)) /* broadcast MAC address */ memset(nc_ether, 0xff, sizeof(nc_ether)); else /* force arp request */ memset(nc_ether, 0, sizeof(nc_ether)); } return 0; } /** * Called from net_loop in net/net.c before each packet */ void nc_start(void) { refresh_settings_from_env(); if (!output_packet_len || memcmp(nc_ether, net_null_ethaddr, 6)) { /* going to check for input packet */ net_set_udp_handler(nc_handler); net_set_timeout_handler(net_timeout, nc_timeout_handler); } else { /* send arp request */ uchar *pkt; net_set_arp_handler(nc_wait_arp_handler); pkt = (uchar *)net_tx_packet + net_eth_hdr_size() + IP_UDP_HDR_SIZE; memcpy(pkt, output_packet, output_packet_len); net_send_udp_packet(nc_ether, nc_ip, nc_out_port, nc_in_port, output_packet_len); } } int nc_input_packet(uchar *pkt, struct in_addr src_ip, unsigned dest_port, unsigned src_port, unsigned len) { int end, chunk; if (dest_port != nc_in_port || !len) return 0; /* not for us */ if (src_ip.s_addr != nc_ip.s_addr && !is_broadcast(nc_ip)) return 0; /* not from our client */ debug_cond(DEBUG_DEV_PKT, "input: \"%*.*s\"\n", len, len, pkt); if (input_size == sizeof(input_buffer)) return 1; /* no space */ if (len > sizeof(input_buffer) - input_size) len = sizeof(input_buffer) - input_size; end = input_offset + input_size; if (end >= sizeof(input_buffer)) end -= sizeof(input_buffer); chunk = len; /* Check if packet will wrap in input_buffer */ if (end + len >= sizeof(input_buffer)) { chunk = sizeof(input_buffer) - end; /* Copy the second part of the pkt to start of input_buffer */ memcpy(input_buffer, pkt + chunk, len - chunk); } /* Copy first (or only) part of pkt after end of current valid input*/ memcpy(input_buffer + end, pkt, chunk); input_size += len; return 1; } static void nc_send_packet(const char *buf, int len) { struct udevice *eth; int inited = 0; uchar *pkt; uchar *ether; struct in_addr ip; debug_cond(DEBUG_DEV_PKT, "output: \"%*.*s\"\n", len, len, buf); eth = eth_get_dev(); if (eth == NULL) return; if (!memcmp(nc_ether, net_null_ethaddr, 6)) { if (eth_is_active(eth)) return; /* inside net loop */ output_packet = buf; output_packet_len = len; input_recursion = 1; net_loop(NETCONS); /* wait for arp reply and send packet */ input_recursion = 0; output_packet_len = 0; return; } if (!eth_is_active(eth)) { if (eth_is_on_demand_init()) { if (eth_init() < 0) return; eth_set_last_protocol(NETCONS); } else { eth_init_state_only(); } inited = 1; } pkt = (uchar *)net_tx_packet + net_eth_hdr_size() + IP_UDP_HDR_SIZE; memcpy(pkt, buf, len); ether = nc_ether; ip = nc_ip; net_send_udp_packet(ether, ip, nc_out_port, nc_in_port, len); if (inited) { if (eth_is_on_demand_init()) eth_halt(); else eth_halt_state_only(); } } static int nc_stdio_start(struct stdio_dev *dev) { int retval; nc_out_port = 6666; /* default port */ nc_in_port = nc_out_port; retval = refresh_settings_from_env(); if (retval != 0) return retval; /* * Initialize the static IP settings and buffer pointers * incase we call net_send_udp_packet before net_loop */ net_init(); return 0; } static void nc_stdio_putc(struct stdio_dev *dev, char c) { if (output_recursion) return; output_recursion = 1; nc_send_packet(&c, 1); output_recursion = 0; } static void nc_stdio_puts(struct stdio_dev *dev, const char *s) { int len; if (output_recursion) return; output_recursion = 1; len = strlen(s); while (len) { int send_len = min(len, (int)sizeof(input_buffer)); nc_send_packet(s, send_len); len -= send_len; s += send_len; } output_recursion = 0; } static int nc_stdio_getc(struct stdio_dev *dev) { uchar c; input_recursion = 1; net_timeout = 0; /* no timeout */ while (!input_size) net_loop(NETCONS); input_recursion = 0; c = input_buffer[input_offset++]; if (input_offset >= sizeof(input_buffer)) input_offset -= sizeof(input_buffer); input_size--; return c; } static int nc_stdio_tstc(struct stdio_dev *dev) { struct udevice *eth; if (input_recursion) return 0; if (input_size) return 1; eth = eth_get_dev(); if (eth_is_active(eth)) return 0; /* inside net loop */ input_recursion = 1; net_timeout = 1; net_loop(NETCONS); /* kind of poll */ input_recursion = 0; return input_size != 0; } int drv_nc_init(void) { struct stdio_dev dev; int rc; memset(&dev, 0, sizeof(dev)); strcpy(dev.name, "nc"); dev.flags = DEV_FLAGS_OUTPUT | DEV_FLAGS_INPUT; dev.start = nc_stdio_start; dev.putc = nc_stdio_putc; dev.puts = nc_stdio_puts; dev.getc = nc_stdio_getc; dev.tstc = nc_stdio_tstc; rc = stdio_register(&dev); return (rc == 0) ? 1 : rc; }