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https://github.com/brain-hackers/u-boot-brain
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![Tom Rini](/assets/img/avatar_default.png)
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
344 lines
7.5 KiB
C
344 lines
7.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2004
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*/
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#include <common.h>
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#include <command.h>
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#include <stdio_dev.h>
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#include <net.h>
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#ifndef CONFIG_NETCONSOLE_BUFFER_SIZE
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#define CONFIG_NETCONSOLE_BUFFER_SIZE 512
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#endif
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static char input_buffer[CONFIG_NETCONSOLE_BUFFER_SIZE];
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static int input_size; /* char count in input buffer */
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static int input_offset; /* offset to valid chars in input buffer */
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static int input_recursion;
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static int output_recursion;
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static int net_timeout;
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static uchar nc_ether[6]; /* server enet address */
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static struct in_addr nc_ip; /* server ip */
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static short nc_out_port; /* target output port */
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static short nc_in_port; /* source input port */
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static const char *output_packet; /* used by first send udp */
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static int output_packet_len;
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/*
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* Start with a default last protocol.
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* We are only interested in NETCONS or not.
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*/
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enum proto_t net_loop_last_protocol = BOOTP;
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static void nc_wait_arp_handler(uchar *pkt, unsigned dest,
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struct in_addr sip, unsigned src,
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unsigned len)
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{
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net_set_state(NETLOOP_SUCCESS); /* got arp reply - quit net loop */
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}
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static void nc_handler(uchar *pkt, unsigned dest, struct in_addr sip,
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unsigned src, unsigned len)
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{
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if (input_size)
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net_set_state(NETLOOP_SUCCESS); /* got input - quit net loop */
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}
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static void nc_timeout_handler(void)
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{
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net_set_state(NETLOOP_SUCCESS);
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}
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static int is_broadcast(struct in_addr ip)
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{
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static struct in_addr netmask;
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static struct in_addr our_ip;
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static int env_changed_id;
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int env_id = get_env_id();
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/* update only when the environment has changed */
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if (env_changed_id != env_id) {
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netmask = env_get_ip("netmask");
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our_ip = env_get_ip("ipaddr");
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env_changed_id = env_id;
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}
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return (ip.s_addr == ~0 || /* 255.255.255.255 (global bcast) */
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((netmask.s_addr & our_ip.s_addr) ==
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(netmask.s_addr & ip.s_addr) && /* on the same net and */
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(netmask.s_addr | ip.s_addr) == ~0)); /* bcast to our net */
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}
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static int refresh_settings_from_env(void)
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{
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const char *p;
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static int env_changed_id;
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int env_id = get_env_id();
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/* update only when the environment has changed */
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if (env_changed_id != env_id) {
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if (env_get("ncip")) {
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nc_ip = env_get_ip("ncip");
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if (!nc_ip.s_addr)
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return -1; /* ncip is 0.0.0.0 */
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p = strchr(env_get("ncip"), ':');
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if (p != NULL) {
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nc_out_port = simple_strtoul(p + 1, NULL, 10);
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nc_in_port = nc_out_port;
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}
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} else {
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nc_ip.s_addr = ~0; /* ncip is not set, so broadcast */
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}
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p = env_get("ncoutport");
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if (p != NULL)
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nc_out_port = simple_strtoul(p, NULL, 10);
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p = env_get("ncinport");
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if (p != NULL)
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nc_in_port = simple_strtoul(p, NULL, 10);
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if (is_broadcast(nc_ip))
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/* broadcast MAC address */
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memset(nc_ether, 0xff, sizeof(nc_ether));
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else
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/* force arp request */
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memset(nc_ether, 0, sizeof(nc_ether));
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}
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return 0;
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}
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/**
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* Called from net_loop in net/net.c before each packet
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*/
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void nc_start(void)
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{
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refresh_settings_from_env();
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if (!output_packet_len || memcmp(nc_ether, net_null_ethaddr, 6)) {
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/* going to check for input packet */
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net_set_udp_handler(nc_handler);
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net_set_timeout_handler(net_timeout, nc_timeout_handler);
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} else {
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/* send arp request */
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uchar *pkt;
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net_set_arp_handler(nc_wait_arp_handler);
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pkt = (uchar *)net_tx_packet + net_eth_hdr_size() +
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IP_UDP_HDR_SIZE;
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memcpy(pkt, output_packet, output_packet_len);
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net_send_udp_packet(nc_ether, nc_ip, nc_out_port, nc_in_port,
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output_packet_len);
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}
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}
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int nc_input_packet(uchar *pkt, struct in_addr src_ip, unsigned dest_port,
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unsigned src_port, unsigned len)
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{
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int end, chunk;
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if (dest_port != nc_in_port || !len)
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return 0; /* not for us */
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if (src_ip.s_addr != nc_ip.s_addr && !is_broadcast(nc_ip))
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return 0; /* not from our client */
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debug_cond(DEBUG_DEV_PKT, "input: \"%*.*s\"\n", len, len, pkt);
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if (input_size == sizeof(input_buffer))
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return 1; /* no space */
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if (len > sizeof(input_buffer) - input_size)
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len = sizeof(input_buffer) - input_size;
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end = input_offset + input_size;
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if (end >= sizeof(input_buffer))
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end -= sizeof(input_buffer);
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chunk = len;
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/* Check if packet will wrap in input_buffer */
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if (end + len >= sizeof(input_buffer)) {
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chunk = sizeof(input_buffer) - end;
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/* Copy the second part of the pkt to start of input_buffer */
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memcpy(input_buffer, pkt + chunk, len - chunk);
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}
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/* Copy first (or only) part of pkt after end of current valid input*/
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memcpy(input_buffer + end, pkt, chunk);
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input_size += len;
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return 1;
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}
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static void nc_send_packet(const char *buf, int len)
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{
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#ifdef CONFIG_DM_ETH
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struct udevice *eth;
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#else
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struct eth_device *eth;
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#endif
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int inited = 0;
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uchar *pkt;
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uchar *ether;
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struct in_addr ip;
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debug_cond(DEBUG_DEV_PKT, "output: \"%*.*s\"\n", len, len, buf);
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eth = eth_get_dev();
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if (eth == NULL)
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return;
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if (!memcmp(nc_ether, net_null_ethaddr, 6)) {
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if (eth_is_active(eth))
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return; /* inside net loop */
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output_packet = buf;
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output_packet_len = len;
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input_recursion = 1;
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net_loop(NETCONS); /* wait for arp reply and send packet */
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input_recursion = 0;
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output_packet_len = 0;
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return;
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}
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if (!eth_is_active(eth)) {
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if (eth_is_on_demand_init()) {
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if (eth_init() < 0)
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return;
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eth_set_last_protocol(NETCONS);
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} else {
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eth_init_state_only();
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}
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inited = 1;
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}
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pkt = (uchar *)net_tx_packet + net_eth_hdr_size() + IP_UDP_HDR_SIZE;
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memcpy(pkt, buf, len);
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ether = nc_ether;
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ip = nc_ip;
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net_send_udp_packet(ether, ip, nc_out_port, nc_in_port, len);
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if (inited) {
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if (eth_is_on_demand_init())
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eth_halt();
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else
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eth_halt_state_only();
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}
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}
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static int nc_stdio_start(struct stdio_dev *dev)
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{
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int retval;
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nc_out_port = 6666; /* default port */
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nc_in_port = nc_out_port;
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retval = refresh_settings_from_env();
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if (retval != 0)
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return retval;
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/*
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* Initialize the static IP settings and buffer pointers
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* incase we call net_send_udp_packet before net_loop
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*/
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net_init();
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return 0;
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}
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static void nc_stdio_putc(struct stdio_dev *dev, char c)
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{
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if (output_recursion)
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return;
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output_recursion = 1;
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nc_send_packet(&c, 1);
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output_recursion = 0;
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}
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static void nc_stdio_puts(struct stdio_dev *dev, const char *s)
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{
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int len;
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if (output_recursion)
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return;
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output_recursion = 1;
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len = strlen(s);
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while (len) {
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int send_len = min(len, (int)sizeof(input_buffer));
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nc_send_packet(s, send_len);
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len -= send_len;
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s += send_len;
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}
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output_recursion = 0;
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}
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static int nc_stdio_getc(struct stdio_dev *dev)
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{
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uchar c;
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input_recursion = 1;
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net_timeout = 0; /* no timeout */
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while (!input_size)
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net_loop(NETCONS);
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input_recursion = 0;
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c = input_buffer[input_offset++];
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if (input_offset >= sizeof(input_buffer))
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input_offset -= sizeof(input_buffer);
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input_size--;
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return c;
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}
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static int nc_stdio_tstc(struct stdio_dev *dev)
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{
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#ifdef CONFIG_DM_ETH
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struct udevice *eth;
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#else
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struct eth_device *eth;
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#endif
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if (input_recursion)
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return 0;
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if (input_size)
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return 1;
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eth = eth_get_dev();
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if (eth_is_active(eth))
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return 0; /* inside net loop */
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input_recursion = 1;
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net_timeout = 1;
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net_loop(NETCONS); /* kind of poll */
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input_recursion = 0;
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return input_size != 0;
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}
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int drv_nc_init(void)
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{
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struct stdio_dev dev;
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int rc;
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memset(&dev, 0, sizeof(dev));
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strcpy(dev.name, "nc");
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dev.flags = DEV_FLAGS_OUTPUT | DEV_FLAGS_INPUT;
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dev.start = nc_stdio_start;
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dev.putc = nc_stdio_putc;
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dev.puts = nc_stdio_puts;
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dev.getc = nc_stdio_getc;
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dev.tstc = nc_stdio_tstc;
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rc = stdio_register(&dev);
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return (rc == 0) ? 1 : rc;
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}
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