static int
protohandlergreout(struct libalias *la, struct ip *pip, struct alias_data *ah)
{
if (AliasHandlePptpGreOut(la, pip) == 0)
return (0);
return (-1);
}
int
PacketAliasOut(char *ptr, /* valid IP packet */
int maxpacketsize /* How much the packet data may grow
(FTP and IRC inline changes) */
)
{
int iresult;
struct in_addr addr_save;
struct ip *pip;
if (packetAliasMode & PKT_ALIAS_REVERSE) {
packetAliasMode &= ~PKT_ALIAS_REVERSE;
iresult = PacketAliasIn(ptr, maxpacketsize);
packetAliasMode |= PKT_ALIAS_REVERSE;
return iresult;
}
HouseKeeping();
ClearCheckNewLink();
pip = (struct ip *) ptr;
/* Defense against mangled packets */
if (ntohs(pip->ip_len) > maxpacketsize
|| (pip->ip_hl<<2) > maxpacketsize)
return PKT_ALIAS_IGNORED;
addr_save = GetDefaultAliasAddress();
if (packetAliasMode & PKT_ALIAS_UNREGISTERED_ONLY)
{
u_long addr;
int iclass;
iclass = 0;
addr = ntohl(pip->ip_src.s_addr);
if (addr >= UNREG_ADDR_C_LOWER && addr <= UNREG_ADDR_C_UPPER)
iclass = 3;
else if (addr >= UNREG_ADDR_B_LOWER && addr <= UNREG_ADDR_B_UPPER)
iclass = 2;
else if (addr >= UNREG_ADDR_A_LOWER && addr <= UNREG_ADDR_A_UPPER)
iclass = 1;
if (iclass == 0)
{
SetDefaultAliasAddress(pip->ip_src);
}
}
iresult = PKT_ALIAS_IGNORED;
if ((ntohs(pip->ip_off) & IP_OFFMASK) == 0)
{
switch (pip->ip_p)
{
case IPPROTO_ICMP:
iresult = IcmpAliasOut(pip);
break;
case IPPROTO_UDP:
iresult = UdpAliasOut(pip);
break;
case IPPROTO_TCP:
iresult = TcpAliasOut(pip, maxpacketsize);
break;
case IPPROTO_GRE:
if (AliasHandlePptpGreOut(pip) == 0)
iresult = PKT_ALIAS_OK;
else
iresult = ProtoAliasOut(pip);
break;
default:
iresult = ProtoAliasOut(pip);
break;
}
}
else
{
iresult = FragmentOut(pip);
}
SetDefaultAliasAddress(addr_save);
return(iresult);
}
