63 lines
2.4 KiB
Diff
63 lines
2.4 KiB
Diff
|
From bcd7c648e86d97263c931de53a008c9629e7797e Mon Sep 17 00:00:00 2001
|
||
|
|
From: Stefan Becker <stefan.becker@nokia.com>
|
||
|
|
Date: Fri, 11 Dec 2009 21:08:57 +0200
|
||
|
|
Subject: [PATCH] Restrict igmp reports forwarding to upstream interface
|
||
|
|
|
||
|
|
Utilize the new "whitelist" keyword also on the upstream interface definition.
|
||
|
|
If specified then only whitelisted multicast groups will be forwarded upstream.
|
||
|
|
|
||
|
|
This can be used to avoid publishing private multicast groups to the world,
|
||
|
|
e.g. SSDP from a UPnP server on the internal network.
|
||
|
|
---
|
||
|
|
doc/igmpproxy.conf.5.in | 5 +++++
|
||
|
|
src/rttable.c | 17 +++++++++++++++++
|
||
|
|
2 files changed, 22 insertions(+), 0 deletions(-)
|
||
|
|
|
||
|
|
diff --git a/doc/igmpproxy.conf.5.in b/doc/igmpproxy.conf.5.in
|
||
|
|
index 56efa22..d916f05 100644
|
||
|
|
--- a/doc/igmpproxy.conf.5.in
|
||
|
|
+++ b/doc/igmpproxy.conf.5.in
|
||
|
|
@@ -134,6 +134,11 @@ You may specify as many whitelist entries as needed. Although you should keep it
|
||
|
|
possible, as this list is parsed for every membership report and therefore this increases igmp
|
||
|
|
response times. Often used or large groups should be defined first, as parsing ends as soon as
|
||
|
|
a group matches an entry.
|
||
|
|
+
|
||
|
|
+You may also specify whitelist entries for the upstream interface. Only igmp membership reports
|
||
|
|
+for explicitely whitelisted multicast groups will be sent out on the upstream interface. This
|
||
|
|
+is useful if you want to use multicast groups only between your downstream interfaces, like SSDP
|
||
|
|
+from a UPnP server.
|
||
|
|
.RE
|
||
|
|
|
||
|
|
.SH EXAMPLE
|
||
|
|
diff --git a/src/rttable.c b/src/rttable.c
|
||
|
|
index f0701a8..77dd791 100644
|
||
|
|
--- a/src/rttable.c
|
||
|
|
+++ b/src/rttable.c
|
||
|
|
@@ -117,6 +117,23 @@ void sendJoinLeaveUpstream(struct RouteTable* route, int join) {
|
||
|
|
my_log(LOG_ERR, 0 ,"FATAL: Unable to get Upstream IF.");
|
||
|
|
}
|
||
|
|
|
||
|
|
+ // Check if there is a white list for the upstram VIF
|
||
|
|
+ if (upstrIf->allowedgroups != NULL) {
|
||
|
|
+ uint32_t group = route->group;
|
||
|
|
+ struct SubnetList* sn;
|
||
|
|
+
|
||
|
|
+ // Check if this Request is legit to be forwarded to upstream
|
||
|
|
+ for(sn = upstrIf->allowedgroups; sn != NULL; sn = sn->next)
|
||
|
|
+ if((group & sn->subnet_mask) == sn->subnet_addr)
|
||
|
|
+ // Forward is OK...
|
||
|
|
+ break;
|
||
|
|
+
|
||
|
|
+ if (sn == NULL) {
|
||
|
|
+ my_log(LOG_INFO, 0, "The group address %s may not be forwarded upstream. Ignoring.", inetFmt(group, s1));
|
||
|
|
+ return;
|
||
|
|
+ }
|
||
|
|
+ }
|
||
|
|
+
|
||
|
|
// Send join or leave request...
|
||
|
|
if(join) {
|
||
|
|
|
||
|
|
--
|
||
|
|
1.7.2.5
|
||
|
|
|