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// SPDX-License-Identifier: GPL-2.0+
/* Copyright (C) 2024 Linaro Ltd. */
#include <command.h>
#include <console.h>
#include <dm/device.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <lwip/icmp.h>
#include <lwip/inet_chksum.h>
#include <lwip/raw.h>
#include <lwip/timeouts.h>
#include <net.h>
#include <time.h>
U_BOOT_CMD(ping, 2, 1, do_ping, "send ICMP ECHO_REQUEST to network host",
"pingAddressOrHostName");
#define PING_DELAY_MS 1000
#define PING_COUNT 5
/* Ping identifier - must fit on a u16_t */
#define PING_ID 0xAFAF
struct ping_ctx {
ip_addr_t target;
struct raw_pcb *pcb;
struct icmp_echo_hdr *iecho;
uint16_t seq_num;
bool alive;
};
static u8_t ping_recv(void *arg, struct raw_pcb *pcb, struct pbuf *p,
const ip_addr_t *addr)
{
struct ping_ctx *ctx = arg;
struct icmp_echo_hdr *iecho = ctx->iecho;
if (addr->addr != ctx->target.addr)
return 0;
if ((p->tot_len >= (IP_HLEN + sizeof(struct icmp_echo_hdr))) &&
pbuf_remove_header(p, IP_HLEN) == 0) {
iecho = (struct icmp_echo_hdr *)p->payload;
if (iecho->id == PING_ID &&
iecho->seqno == lwip_htons(ctx->seq_num)) {
ctx->alive = true;
printf("host %s is alive\n", ipaddr_ntoa(addr));
pbuf_free(p);
return 1; /* eat the packet */
}
/* not eaten, restore original packet */
pbuf_add_header(p, IP_HLEN);
}
return 0; /* don't eat the packet */
}
static int ping_raw_init(struct ping_ctx *ctx)
{
ctx->pcb = raw_new(IP_PROTO_ICMP);
if (!ctx->pcb)
return -ENOMEM;
raw_recv(ctx->pcb, ping_recv, ctx);
raw_bind(ctx->pcb, IP_ADDR_ANY);
return 0;
}
static void ping_raw_stop(struct ping_ctx *ctx)
{
if (ctx->pcb)
raw_remove(ctx->pcb);
}
static void ping_prepare_echo(struct ping_ctx *ctx)
{
struct icmp_echo_hdr *iecho = ctx->iecho;
ICMPH_TYPE_SET(iecho, ICMP_ECHO);
ICMPH_CODE_SET(iecho, 0);
iecho->chksum = 0;
iecho->id = PING_ID;
iecho->seqno = lwip_htons(ctx->seq_num);
iecho->chksum = inet_chksum(iecho, sizeof(*iecho));
}
static void ping_send_icmp(struct ping_ctx *ctx)
{
struct pbuf *p;
size_t ping_size = sizeof(struct icmp_echo_hdr);
p = pbuf_alloc(PBUF_IP, (u16_t)ping_size, PBUF_RAM);
if (!p)
return;
if (p->len == p->tot_len && !p->next) {
ctx->iecho = (struct icmp_echo_hdr *)p->payload;
ping_prepare_echo(ctx);
raw_sendto(ctx->pcb, p, &ctx->target);
}
pbuf_free(p);
}
static void ping_send(void *arg)
{
struct ping_ctx *ctx = arg;
ctx->seq_num++;
if (ctx->seq_num <= PING_COUNT) {
ping_send_icmp(ctx);
sys_timeout(PING_DELAY_MS, ping_send, ctx);
}
}
static int ping_loop(struct udevice *udev, const ip_addr_t *addr)
{
struct ping_ctx ctx = {};
struct netif *netif;
int ret;
netif = net_lwip_new_netif(udev);
if (!netif)
return -ENODEV;
printf("Using %s device\n", udev->name);
ret = ping_raw_init(&ctx);
if (ret < 0) {
net_lwip_remove_netif(netif);
return ret;
}
ctx.target = *addr;
ping_send(&ctx);
do {
net_lwip_rx(udev, netif);
if (ctx.alive)
break;
if (ctrlc()) {
printf("\nAbort\n");
break;
}
} while (ctx.seq_num <= PING_COUNT);
sys_untimeout(ping_send, &ctx);
ping_raw_stop(&ctx);
net_lwip_remove_netif(netif);
if (ctx.alive)
return 0;
printf("ping failed; host %s is not alive\n", ipaddr_ntoa(addr));
return -1;
}
int do_ping(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
{
ip_addr_t addr;
if (argc < 2)
return CMD_RET_USAGE;
if (net_lwip_dns_resolve(argv[1], &addr))
return CMD_RET_USAGE;
restart:
if (net_lwip_eth_start() < 0 || ping_loop(eth_get_dev(), &addr) < 0) {
if (net_start_again() == 0)
goto restart;
else
return CMD_RET_FAILURE;
}
return CMD_RET_SUCCESS;
}
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