u-boot/net/wget.c

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// SPDX-License-Identifier: GPL-2.0
/*
* WGET/HTTP support driver based on U-BOOT's nfs.c
* Copyright Duncan Hare <dh@synoia.com> 2017
*/
#include <command.h>
#include <common.h>
#include <display_options.h>
#include <env.h>
#include <image.h>
#include <mapmem.h>
#include <net.h>
#include <net/tcp.h>
#include <net/wget.h>
static const char bootfile1[] = "GET ";
static const char bootfile3[] = " HTTP/1.0\r\n\r\n";
static const char http_eom[] = "\r\n\r\n";
static const char http_ok[] = "200";
static const char content_len[] = "Content-Length";
static const char linefeed[] = "\r\n";
static struct in_addr web_server_ip;
static int our_port;
static int wget_timeout_count;
struct pkt_qd {
uchar *pkt;
unsigned int tcp_seq_num;
unsigned int len;
};
/*
* This is a control structure for out of order packets received.
* The actual packet bufers are in the kernel space, and are
* expected to be overwritten by the downloaded image.
*/
static struct pkt_qd pkt_q[PKTBUFSRX / 4];
static int pkt_q_idx;
static unsigned long content_length;
static unsigned int packets;
static unsigned int initial_data_seq_num;
static enum wget_state current_wget_state;
static char *image_url;
static unsigned int wget_timeout = WGET_TIMEOUT;
static enum net_loop_state wget_loop_state;
/* Timeout retry parameters */
static u8 retry_action; /* actions for TCP retry */
static unsigned int retry_tcp_ack_num; /* TCP retry acknowledge number*/
static unsigned int retry_tcp_seq_num; /* TCP retry sequence number */
static int retry_len; /* TCP retry length */
/**
* store_block() - store block in memory
* @src: source of data
* @offset: offset
* @len: length
*/
static inline int store_block(uchar *src, unsigned int offset, unsigned int len)
{
ulong newsize = offset + len;
uchar *ptr;
ptr = map_sysmem(image_load_addr + offset, len);
memcpy(ptr, src, len);
unmap_sysmem(ptr);
if (net_boot_file_size < (offset + len))
net_boot_file_size = newsize;
return 0;
}
/**
* wget_send_stored() - wget response dispatcher
*
* WARNING, This, and only this, is the place in wget.c where
* SEQUENCE NUMBERS are swapped between incoming (RX)
* and outgoing (TX).
* Procedure wget_handler() is correct for RX traffic.
*/
static void wget_send_stored(void)
{
u8 action = retry_action;
int len = retry_len;
unsigned int tcp_ack_num = retry_tcp_ack_num + len;
unsigned int tcp_seq_num = retry_tcp_seq_num;
uchar *ptr, *offset;
switch (current_wget_state) {
case WGET_CLOSED:
debug_cond(DEBUG_WGET, "wget: send SYN\n");
current_wget_state = WGET_CONNECTING;
net_send_tcp_packet(0, SERVER_PORT, our_port, action,
tcp_seq_num, tcp_ack_num);
packets = 0;
break;
case WGET_CONNECTING:
pkt_q_idx = 0;
net_send_tcp_packet(0, SERVER_PORT, our_port, action,
tcp_seq_num, tcp_ack_num);
ptr = net_tx_packet + net_eth_hdr_size() +
IP_TCP_HDR_SIZE + TCP_TSOPT_SIZE + 2;
offset = ptr;
memcpy(offset, &bootfile1, strlen(bootfile1));
offset += strlen(bootfile1);
memcpy(offset, image_url, strlen(image_url));
offset += strlen(image_url);
memcpy(offset, &bootfile3, strlen(bootfile3));
offset += strlen(bootfile3);
net_send_tcp_packet((offset - ptr), SERVER_PORT, our_port,
TCP_PUSH, tcp_seq_num, tcp_ack_num);
current_wget_state = WGET_CONNECTED;
break;
case WGET_CONNECTED:
case WGET_TRANSFERRING:
case WGET_TRANSFERRED:
net_send_tcp_packet(0, SERVER_PORT, our_port, action,
tcp_seq_num, tcp_ack_num);
break;
}
}
static void wget_send(u8 action, unsigned int tcp_ack_num,
unsigned int tcp_seq_num, int len)
{
retry_action = action;
retry_tcp_ack_num = tcp_ack_num;
retry_tcp_seq_num = tcp_seq_num;
retry_len = len;
wget_send_stored();
}
void wget_fail(char *error_message, unsigned int tcp_seq_num,
unsigned int tcp_ack_num, u8 action)
{
printf("wget: Transfer Fail - %s\n", error_message);
net_set_timeout_handler(0, NULL);
wget_send(action, tcp_seq_num, tcp_ack_num, 0);
}
void wget_success(u8 action, unsigned int tcp_seq_num,
unsigned int tcp_ack_num, int len, int packets)
{
printf("Packets received %d, Transfer Successful\n", packets);
wget_send(action, tcp_seq_num, tcp_ack_num, len);
}
/*
* Interfaces of U-BOOT
*/
static void wget_timeout_handler(void)
{
if (++wget_timeout_count > WGET_RETRY_COUNT) {
puts("\nRetry count exceeded; starting again\n");
wget_send(TCP_RST, 0, 0, 0);
net_start_again();
} else {
puts("T ");
net_set_timeout_handler(wget_timeout +
WGET_TIMEOUT * wget_timeout_count,
wget_timeout_handler);
wget_send_stored();
}
}
#define PKT_QUEUE_OFFSET 0x20000
#define PKT_QUEUE_PACKET_SIZE 0x800
static void wget_connected(uchar *pkt, unsigned int tcp_seq_num,
struct in_addr action_and_state,
unsigned int tcp_ack_num, unsigned int len)
{
u8 action = action_and_state.s_addr;
uchar *pkt_in_q;
char *pos;
int hlen, i;
uchar *ptr1;
pkt[len] = '\0';
pos = strstr((char *)pkt, http_eom);
if (!pos) {
debug_cond(DEBUG_WGET,
"wget: Connected, data before Header %p\n", pkt);
pkt_in_q = (void *)image_load_addr + PKT_QUEUE_OFFSET +
(pkt_q_idx * PKT_QUEUE_PACKET_SIZE);
ptr1 = map_sysmem((phys_addr_t)pkt_in_q, len);
memcpy(ptr1, pkt, len);
unmap_sysmem(ptr1);
pkt_q[pkt_q_idx].pkt = pkt_in_q;
pkt_q[pkt_q_idx].tcp_seq_num = tcp_seq_num;
pkt_q[pkt_q_idx].len = len;
pkt_q_idx++;
} else {
debug_cond(DEBUG_WGET, "wget: Connected HTTP Header %p\n", pkt);
/* sizeof(http_eom) - 1 is the string length of (http_eom) */
hlen = pos - (char *)pkt + sizeof(http_eom) - 1;
pos = strstr((char *)pkt, linefeed);
if (pos > 0)
i = pos - (char *)pkt;
else
i = hlen;
printf("%.*s", i, pkt);
current_wget_state = WGET_TRANSFERRING;
if (strstr((char *)pkt, http_ok) == 0) {
debug_cond(DEBUG_WGET,
"wget: Connected Bad Xfer\n");
initial_data_seq_num = tcp_seq_num + hlen;
wget_loop_state = NETLOOP_FAIL;
wget_send(action, tcp_seq_num, tcp_ack_num, len);
} else {
debug_cond(DEBUG_WGET,
"wget: Connctd pkt %p hlen %x\n",
pkt, hlen);
initial_data_seq_num = tcp_seq_num + hlen;
pos = strstr((char *)pkt, content_len);
if (!pos) {
content_length = -1;
} else {
pos += sizeof(content_len) + 2;
strict_strtoul(pos, 10, &content_length);
debug_cond(DEBUG_WGET,
"wget: Connected Len %lu\n",
content_length);
}
net_boot_file_size = 0;
if (len > hlen)
store_block(pkt + hlen, 0, len - hlen);
debug_cond(DEBUG_WGET,
"wget: Connected Pkt %p hlen %x\n",
pkt, hlen);
for (i = 0; i < pkt_q_idx; i++) {
ptr1 = map_sysmem(
(phys_addr_t)(pkt_q[i].pkt),
pkt_q[i].len);
store_block(ptr1,
pkt_q[i].tcp_seq_num -
initial_data_seq_num,
pkt_q[i].len);
unmap_sysmem(ptr1);
debug_cond(DEBUG_WGET,
"wget: Connctd pkt Q %p len %x\n",
pkt_q[i].pkt, pkt_q[i].len);
}
}
}
wget_send(action, tcp_seq_num, tcp_ack_num, len);
}
/**
* wget_handler() - handler of wget
* @pkt: the pointer to the payload
* @tcp_seq_num: tcp sequence number
* @action_and_state: TCP state
* @tcp_ack_num: tcp acknowledge number
* @len: length of the payload
*
* In the "application push" invocation, the TCP header with all
* its information is pointed to by the packet pointer.
*/
static void wget_handler(uchar *pkt, unsigned int tcp_seq_num,
struct in_addr action_and_state,
unsigned int tcp_ack_num, unsigned int len)
{
enum tcp_state wget_tcp_state = tcp_get_tcp_state();
u8 action = action_and_state.s_addr;
net_set_timeout_handler(wget_timeout, wget_timeout_handler);
packets++;
switch (current_wget_state) {
case WGET_CLOSED:
debug_cond(DEBUG_WGET, "wget: Handler: Error!, State wrong\n");
break;
case WGET_CONNECTING:
debug_cond(DEBUG_WGET,
"wget: Connecting In len=%x, Seq=%x, Ack=%x\n",
len, tcp_seq_num, tcp_ack_num);
if (!len) {
if (wget_tcp_state == TCP_ESTABLISHED) {
debug_cond(DEBUG_WGET,
"wget: Cting, send, len=%x\n", len);
wget_send(action, tcp_seq_num, tcp_ack_num,
len);
} else {
printf("%.*s", len, pkt);
wget_fail("wget: Handler Connected Fail\n",
tcp_seq_num, tcp_ack_num, action);
}
}
break;
case WGET_CONNECTED:
debug_cond(DEBUG_WGET, "wget: Connected seq=%x, len=%x\n",
tcp_seq_num, len);
if (!len) {
wget_fail("Image not found, no data returned\n",
tcp_seq_num, tcp_ack_num, action);
} else {
wget_connected(pkt, tcp_seq_num, action_and_state,
tcp_ack_num, len);
}
break;
case WGET_TRANSFERRING:
debug_cond(DEBUG_WGET,
"wget: Transferring, seq=%x, ack=%x,len=%x\n",
tcp_seq_num, tcp_ack_num, len);
if (tcp_seq_num >= initial_data_seq_num &&
store_block(pkt, tcp_seq_num - initial_data_seq_num,
len) != 0) {
wget_fail("wget: store error\n",
tcp_seq_num, tcp_ack_num, action);
return;
}
switch (wget_tcp_state) {
case TCP_FIN_WAIT_2:
wget_send(TCP_ACK, tcp_seq_num, tcp_ack_num, len);
fallthrough;
case TCP_SYN_SENT:
case TCP_CLOSING:
case TCP_FIN_WAIT_1:
case TCP_CLOSED:
net_set_state(NETLOOP_FAIL);
break;
case TCP_ESTABLISHED:
wget_send(TCP_ACK, tcp_seq_num, tcp_ack_num,
len);
wget_loop_state = NETLOOP_SUCCESS;
break;
case TCP_CLOSE_WAIT: /* End of transfer */
current_wget_state = WGET_TRANSFERRED;
wget_send(action | TCP_ACK | TCP_FIN,
tcp_seq_num, tcp_ack_num, len);
break;
}
break;
case WGET_TRANSFERRED:
printf("Packets received %d, Transfer Successful\n", packets);
net_set_state(wget_loop_state);
break;
}
}
#define RANDOM_PORT_START 1024
#define RANDOM_PORT_RANGE 0x4000
/**
* random_port() - make port a little random (1024-17407)
*
* Return: random port number from 1024 to 17407
*
* This keeps the math somewhat trivial to compute, and seems to work with
* all supported protocols/clients/servers
*/
static unsigned int random_port(void)
{
return RANDOM_PORT_START + (get_timer(0) % RANDOM_PORT_RANGE);
}
#define BLOCKSIZE 512
void wget_start(void)
{
image_url = strchr(net_boot_file_name, ':');
if (image_url > 0) {
web_server_ip = string_to_ip(net_boot_file_name);
++image_url;
net_server_ip = web_server_ip;
} else {
web_server_ip = net_server_ip;
image_url = net_boot_file_name;
}
debug_cond(DEBUG_WGET,
"wget: Transfer HTTP Server %pI4; our IP %pI4\n",
&web_server_ip, &net_ip);
/* Check if we need to send across this subnet */
if (net_gateway.s_addr && net_netmask.s_addr) {
struct in_addr our_net;
struct in_addr server_net;
our_net.s_addr = net_ip.s_addr & net_netmask.s_addr;
server_net.s_addr = net_server_ip.s_addr & net_netmask.s_addr;
if (our_net.s_addr != server_net.s_addr)
debug_cond(DEBUG_WGET,
"wget: sending through gateway %pI4",
&net_gateway);
}
debug_cond(DEBUG_WGET, "URL '%s'\n", image_url);
if (net_boot_file_expected_size_in_blocks) {
debug_cond(DEBUG_WGET, "wget: Size is 0x%x Bytes = ",
net_boot_file_expected_size_in_blocks * BLOCKSIZE);
print_size(net_boot_file_expected_size_in_blocks * BLOCKSIZE,
"");
}
debug_cond(DEBUG_WGET,
"\nwget:Load address: 0x%lx\nLoading: *\b", image_load_addr);
net_set_timeout_handler(wget_timeout, wget_timeout_handler);
tcp_set_tcp_handler(wget_handler);
wget_timeout_count = 0;
current_wget_state = WGET_CLOSED;
our_port = random_port();
/*
* Zero out server ether to force arp resolution in case
* the server ip for the previous u-boot command, for example dns
* is not the same as the web server ip.
*/
memset(net_server_ethaddr, 0, 6);
wget_send(TCP_SYN, 0, 0, 0);
}