/*
* We have been called with an ip-packet located on stack in
* _eth_send_loopback(). Hence, it's safe to call _eth_send() again
* here. MAC-header is in front of 'ip'.
*/
int loopback_device (in_Header *ip)
{
int ip_hlen, ip_len;
DWORD ip_dst;
DWORD ip_ofs;
WORD ip_flg;
if (!loopback_enable || !_chk_ip_header(ip)) /* silently discard */
return (-1);
ip_hlen = in_GetHdrLen (ip); /* length of IP-header (w/options) */
ip_len = intel16 (ip->length); /* total length of IP-packet */
ip_dst = ip->destination;
ip->destination = ip->source; /* swap source and destination */
ip->source = ip_dst;
ip->checksum = 0;
ip->checksum = ~checksum (ip, ip_hlen); /* redo check-sum */
ip_ofs = intel16 (ip->frag_ofs);
ip_flg = ip_ofs & ~IP_OFFMASK;
ip_ofs = (ip_ofs & IP_OFFMASK) << 3; /* 0 <= ip_ofs <= 65536-8 */
if (ip_ofs || (ip_flg & IP_MF)) /* fragment; let _ip_fragment() */
return (ip_len); /* handle it on next poll */
if (ip->proto == ICMP_PROTO)
{
ICMP_PKT *icmp = (ICMP_PKT*) ((BYTE*)ip + ip_hlen);
int len = icmp_loopback (icmp, ip_len - ip_hlen);
if (len > 0)
return (ip_hlen+len);
}
else if (ip->proto == UDP_PROTO)
{
udp_Header *udp = (udp_Header*) ((BYTE*)ip + ip_hlen);
int len = udp_loopback (udp, ip_len-ip_hlen);
if (len > 0)
return (ip_hlen+len);
}
if (loopback_handler)
ip_len = (*loopback_handler) (ip);
return (ip_len);
}
/**
* \def loopback_device().
*
* We have been called with an IP-packet located on stack by `send_loopback()'
* (in pcsed.c). Hence, it's safe to call _eth_send() again here.
* MAC-header is in front of 'ip'.
*/
int loopback_device (in_Header *ip)
{
int ip_len = 0;
DWORD ip_dst;
DWORD ip_ofs;
WORD ip_flg;
if (!(loopback_mode & LBACK_MODE_ENABLE))
return (-1);
if (ip->ver == 4)
{
int ip_hlen;
if (!_chk_ip4_header(ip)) /* silently discard */
return (-1);
ip_hlen = in_GetHdrLen (ip); /* length of IP-header (w/options) */
ip_len = intel16 (ip->length); /* total length of IP-packet */
ip_dst = ip->destination;
ip->destination = ip->source; /* swap source and destination */
ip->source = ip_dst;
ip->checksum = 0;
ip->checksum = ~CHECKSUM (ip, ip_hlen); /* redo check-sum */
ip_ofs = intel16 (ip->frag_ofs);
ip_flg = (WORD) (ip_ofs & ~IP_OFFMASK);
ip_ofs = (ip_ofs & IP_OFFMASK) << 3; /* 0 <= ip_ofs <= 65536-8 */
if (ip_ofs || (ip_flg & IP_MF)) /* fragment; let ip4_defragment() */
return (ip_len); /* handle it on next poll */
if (ip->proto == ICMP_PROTO)
{
ICMP_PKT *icmp = (ICMP_PKT*) ((BYTE*)ip + ip_hlen);
int len = icmp_loopback (icmp, ip_len - ip_hlen);
if (len > 0)
return (ip_hlen+len);
}
else if (ip->proto == UDP_PROTO)
{
udp_Header *udp = (udp_Header*) ((BYTE*)ip + ip_hlen);
int len = udp_loopback (udp, ip_len-ip_hlen);
if (len > 0)
return (ip_hlen+len);
}
}
#if defined(USE_IPV6)
else if (ip->ver == 6)
{
in6_Header *ip6 = (in6_Header*)ip;
ip6_address ip6_dst;
ip_len = intel16 (ip6->len);
memcpy (&ip6_dst, &ip6->destination, sizeof(ip6_dst));
memcpy (&ip6->destination, &ip6->source, sizeof(ip6->destination));
memcpy (&ip6->source, &ip6_dst, sizeof(ip6->source));
if (ip6->next_hdr == IP6_NEXT_ICMP)
{
ICMP_PKT *icmp = (ICMP_PKT*) (ip6 + 1);
int len = icmp_loopback (icmp, ip_len);
if (len > 0)
return (len + sizeof(*ip6));
}
else if (ip6->next_hdr == UDP_PROTO)
{
udp_Header *udp = (udp_Header*) (ip6 + 1);
int len = udp_loopback (udp, ip_len);
if (len > 0)
return (len + sizeof(*ip6));
}
}
else
{
(*_printf) ("%s: Illegal IP-packet (ver %d) for loopback device\n",
__FILE__, ip->ver);
return (-1);
}
#endif
if (loopback_handler)
ip_len = (*loopback_handler) (ip);
return (ip_len);
}
