lwIP
2.1.0
Lightweight IP stack
|
#include "lwip/opt.h"
#include "lwip/icmp.h"
#include "lwip/inet_chksum.h"
#include "lwip/ip.h"
#include "lwip/def.h"
#include "lwip/stats.h"
#include <string.h>
#include "path/to/my/lwip_hooks.h"
Macros | |
#define | LWIP_ICMP_ECHO_CHECK_INPUT_PBUF_LEN 1 |
Functions | |
void | icmp_input (struct pbuf *p, struct netif *inp) |
void | icmp_dest_unreach (struct pbuf *p, enum icmp_dur_type t) |
void | icmp_time_exceeded (struct pbuf *p, enum icmp_te_type t) |
ICMP - Internet Control Message Protocol
#define LWIP_ICMP_ECHO_CHECK_INPUT_PBUF_LEN 1 |
Small optimization: set to 0 if incoming PBUF_POOL pbuf always can be used to modify and send a response packet (and to 1 if this is not the case, e.g. when link header is stripped off when receiving)
void icmp_dest_unreach | ( | struct pbuf * | p, |
enum icmp_dur_type | t | ||
) |
Send an icmp 'destination unreachable' packet, called from ip_input() if the transport layer protocol is unknown and from udp_input() if the local port is not bound.
p | the input packet for which the 'unreachable' should be sent, p->payload pointing to the IP header |
t | type of the 'unreachable' packet |
Processes ICMP input packets, called from ip_input().
Currently only processes icmp echo requests and sends out the echo response.
p | the icmp echo request packet, p->payload pointing to the icmp header |
inp | the netif on which this packet was received |
void icmp_time_exceeded | ( | struct pbuf * | p, |
enum icmp_te_type | t | ||
) |
Send a 'time exceeded' packet, called from ip_forward() if TTL is 0.
p | the input packet for which the 'time exceeded' should be sent, p->payload pointing to the IP header |
t | type of the 'time exceeded' packet |