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miniupnpd: set SNAT to support bidirectional mapping 

we cannot expect that iport == eport on all the case in firewall.

Signed-off-by: Chen Minqiang <ptpt52@gmail.com>
This commit is contained in:
Chen Minqiang 2020-04-21 07:41:58 +08:00
parent db82286683
commit e49d44f700
1 changed files with 7 additions and 11 deletions
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18
miniupnpd/netfilter/iptcrdr.c
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@ -224,17 +224,13 @@ add_redirect_rule2(const char * ifname,
if(r >= 0) {
add_redirect_desc(eport, proto, desc, timestamp);
#ifdef ENABLE_PORT_TRIGGERING
/* http://www.netfilter.org/documentation/HOWTO/NAT-HOWTO-6.html#ss6.3
* The default behavior is to alter the connection as little
* as possible, within the constraints of the rule given by
* the user.
* This means we won't remap ports unless we have to. */
if(iport != eport) {
/* TODO : check if this should be done only with UDP */
r = addmasqueraderule(proto, eport, iaddr, iport, rhost/*, ifname*/);
if(r < 0) {
syslog(LOG_NOTICE, "add_redirect_rule2(): addmasqueraderule returned %d", r);
}
/* we now always setup SNAT to support bidirectional mapping
* we cannot expect that iport == eport on all the firewall.
*/
/* TODO : check if this should be done only with UDP */
r = addmasqueraderule(proto, eport, iaddr, iport, rhost/*, ifname*/);
if(r < 0) {
syslog(LOG_NOTICE, "add_redirect_rule2(): addmasqueraderule returned %d", r);
}
#endif /* ENABLE_PORT_TRIGGERING */
}