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netfilter/iptcrdr.c: improve comments 

give which iptables command is equivalent for adding the rule
This commit is contained in:
Thomas Bernard 2016-01-26 18:16:23 +01:00
parent d3635faeed
commit 9059966122
1 changed files with 16 additions and 10 deletions
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26
miniupnpd/netfilter/iptcrdr.c
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@ -238,7 +238,7 @@ add_redirect_rule2(const char * ifname,
return r;
}
/* add_redirect_rule2() */
/* add_peer_redirect_rule2() */
int
add_peer_redirect_rule2(const char * ifname,
const char * rhost, unsigned short rport,
@ -798,6 +798,9 @@ delete_redirect_and_filter_rules(unsigned short eport, int proto)
{
target = (void *)e + e->target_offset;
mr = (const struct ip_nat_multi_range *)&target->data[0];
syslog(LOG_DEBUG, "postrouting rule #%u: %s %s %hu",
i, target->u.user.name, inet_ntoa(e->ip.src), ntohs(mr->range[0].min.all));
/* target->u.user.name SNAT / MASQUERADE */
if (eport != ntohs(mr->range[0].min.all)) {
continue;
}
@ -1108,7 +1111,7 @@ iptc_init_verify_and_append(const char * table,
}
/* add nat rule
* iptables -t nat -A MINIUPNPD -p proto --dport eport -j DNAT --to iaddr:iport
* iptables -t nat -A MINIUPNPD -p <proto> [-s <rhost>] --dport <eport> -j DNAT --to <iaddr>:<iport>
* */
static int
addnatrule(int proto, unsigned short eport,
@ -1170,8 +1173,8 @@ addnatrule(int proto, unsigned short eport,
/* for "Port Triggering"
* Section 2.5.16 figure 2.2 in UPnP-gw-WANIPConnection-v2-Service.pdf
* iptables -t nat -I POSTROUTING -o extif -s iaddr -p UDP --sport iport -j MASQUERADE --to-ports eport
* iptables -t nat -A MINIUPNPD-POSTROUTING -o extif -s iaddr -p UDP --sport iport -j MASQUERADE --to-ports eport
* iptables -t nat -A MINIUPNPD-POSTROUTING -o <extif> -s <iaddr>
* -p <proto> [-d <rhost>] --sport <iport> -j MASQUERADE --to-ports <eport>
*/
static int
addmasqueraderule(int proto,
@ -1242,9 +1245,11 @@ addmasqueraderule(int proto,
return r;
}
/* iptables -t nat -A MINIUPNPD-POSTROUTING -s iaddr -d rhost
* -p proto --sport iport --dport rport -j SNAT
* --to-source ext_ip:eport */
/* called by add_peer_redirect_rule2()
*
* iptables -t nat -A MINIUPNPD-POSTROUTING -s <iaddr> -d <rhost>
* -p <proto> --sport <iport> --dport <rport> -j SNAT
* --to-source <eaddr>:<eport> */
static int
addpeernatrule(int proto,
const char * eaddr, unsigned short eport,
@ -1313,8 +1318,9 @@ addpeernatrule(int proto,
return r;
}
/* iptables -t mangle -A MINIUPNPD -s iaddr -d rhost
* -p proto --sport iport --dport rport -j DSCP
/* called by add_peer_dscp_rule2()
* iptables -t mangle -A MINIUPNPD -s <iaddr> -d <rhost>
* -p <proto> --sport <iport> --dport <rport> -j DSCP
* --set-dscp 0xXXXX */
static int
addpeerdscprule(int proto, unsigned char dscp,
@ -1400,7 +1406,7 @@ get_accept_target(void)
}
/* add_filter_rule()
* */
* iptables -t filter -A MINIUPNPD [-s <rhost>] -p <proto> -d <iaddr> --dport <iport> -j ACCEPT */
static int
add_filter_rule(int proto, const char * rhost,
const char * iaddr, unsigned short iport)