/*---------------------------------------------------------------------
* Method: process_ip(struct sr_instance* sr,
* uint8_t * packet,
* unsigned int len,
* char* interface)
* Scope: Internal
*
* Processes a received IP packet. Takes in a raw ethernet packet.
*
*---------------------------------------------------------------------*/
void process_ip(struct sr_instance* sr,
uint8_t * packet,
unsigned int len,
char* interface)
{
struct sr_ip_hdr *ip_hdr;
/* Return if it is not a valid ip packet */
if (!valid_ip(packet, len))
return;
/* Is it destined for me?! */
ip_hdr = ip_header(packet);
if (sr_interface_ip_match(sr, ip_hdr->ip_dst)) {
/* Process ICMP. */
if (ip_hdr->ip_p == ip_protocol_icmp) {
process_icmp(sr, ip_hdr);
/* If it's TCP/UDP, send ICMP port unreachable. */
} else {
sr_send_icmp(sr,
(uint8_t *)ip_hdr,
ip_len(ip_hdr),
ICMP_UNREACHABLE_TYPE,
ICMP_PORT_CODE);
}
/* Forward it. */
} else {
forward_ip_pkt(sr, ip_hdr);
}
}
void logic_pinger_exec(void)
{
int i;
struct logic_pinger_setup_s *setup = logic_pinger_setup;
struct logic_pinger_state_s *state = logic_pinger_state;
struct ping_state_s *ping = &ping_state[LOGIC_PING_CH];
systime_t time = sys_clock();
for(i=0; i<LOGIC_MAX_PINGER; ++i, ++setup, ++state, ++ping)
{
if(ping->state == PING_RESET && time >= state->next_time)
{
state->next_time = time + setup->period * 1000;
if(valid_ip(setup->ip) == 0)
{
if(setup->hostname[0] == 0)
{ // no ip or hostname, skip
state->result = 0xfe;
continue;
}
else
{ // dns unresolved, treat as ping fail
state->result = 0;
continue;
}
}
util_cpy(setup->ip, ping->ip, 4);
ping->timeout = setup->timeout;
ping->max_retry = 4; // 26.09.2013 fixed value
state->attempt_counter = 0;
ping->state = PING_START;
}
else
if(ping->state == PING_COMPLETED)
{
state->result = ping->result;
ping->state = PING_RESET;
}
} // for channels
}
int main() {
char c []="236.0.0.225";
valid_ip(c);
}
