welterde/l2tpns
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

use router address

Browse source
This commit is contained in:
bodea 2005-06-04 15:42:06 +00:00
parent 0f22007377
commit a51e573de1
1 changed files with 9 additions and 6 deletions
Download patch file Download diff file Expand all files Collapse all files

15
icmp.c
View file

@ -1,6 +1,6 @@
// L2TPNS: icmp
char const *cvs_id_icmp = "$Id: icmp.c,v 1.7 2005/01/25 04:19:05 bodea Exp $";
char const *cvs_id_icmp = "$Id: icmp.c,v 1.8 2005/06/04 15:42:06 bodea Exp $";
#include <arpa/inet.h>
#include <netdb.h>
@ -33,7 +33,6 @@ void host_unreachable(in_addr_t destination, uint16_t id, in_addr_t source, char
char buf[128] = {0};
struct iphdr *iph;
struct icmphdr *icmp;
char *data;
int len = 0, on = 1, icmp_socket;
struct sockaddr_in whereto = {0};
@ -49,9 +48,13 @@ void host_unreachable(in_addr_t destination, uint16_t id, in_addr_t source, char
len = sizeof(struct iphdr);
icmp = (struct icmphdr *)(buf + len);
len += sizeof(struct icmphdr);
data = (char *)(buf + len);
len += (packet_len < 64) ? packet_len : 64;
memcpy(data, packet, (packet_len < 64) ? packet_len : 64);
/* ip header + first 8 bytes of payload */
if (packet_len > (sizeof(struct iphdr) + 8))
packet_len = sizeof(struct iphdr) + 8;
memcpy(buf + len, packet, packet_len);
len += packet_len;
iph->tos = 0;
iph->id = id;
@ -69,7 +72,7 @@ void host_unreachable(in_addr_t destination, uint16_t id, in_addr_t source, char
icmp->type = ICMP_DEST_UNREACH;
icmp->code = ICMP_HOST_UNREACH;
icmp->checksum = _checksum((char *) icmp, sizeof(struct icmphdr) + ((packet_len < 64) ? packet_len : 64));
icmp->checksum = _checksum((char *) icmp, sizeof(struct icmphdr) + packet_len);
iph->check = _checksum((char *) iph, sizeof(struct iphdr));