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gmap: Limit new IPv4 nodes to a class-b private network

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* 172 is generally used for auto-config... so it fits
  well with the ad-hoc mesh nature of Netsukuku
* IPv6 could be limited to a uni-cast local address
  as well.
This commit is contained in:
Alexander von Gluck IV 2014-09-19 14:37:48 -05:00
parent ba6c7a6bf9
commit 1dc21e5bc5
1 changed files with 23 additions and 3 deletions
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26
src/gmap.c
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@ -572,11 +572,31 @@ random_ip(inet_prefix * ipstart, int final_level, int final_gid,
for (;;) {
/*
* Let's choose a completely random ip.
* New gnodes are limited to:
* IPv4: 172.16.0.0/12
* IPv6: fe6e:746b::/32
*/
levels = total_levels;
if (my_family == AF_INET)
idata[0] = rand();
else {
if (my_family == AF_INET) {
int i = 0;
while (i < 4) {
int octet = 0;
switch (i) {
case 0:
octet = 172;
break;
case 1:
octet = (rand() % (31-16)) + 16;
break;
default:
octet = rand() % 255;
break;
}
idata[0] |= (octet << (i * 8));
i++;
}
} else {
// TODO: Generate a random address in fe6e:746b::/32
idata[0] = rand();
idata[1] = rand();
idata[2] = rand();