[IPV6] MROUTE: Support multicast forwarding.
Based on ancient patch by Mickael Hoerdt
<hoerdt@clarinet.u-strasbg.fr>, which is available at
<http://www-r2.u-strasbg.fr/~hoerdt/dev/linux_ipv6_mforwarding/patch-linux-ipv6-mforwarding-0.1a>.
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index a8b4da2..c0dbe54 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -55,6 +55,7 @@
#include <net/icmp.h>
#include <net/xfrm.h>
#include <net/checksum.h>
+#include <linux/mroute6.h>
static int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *));
@@ -137,8 +138,9 @@
struct inet6_dev *idev = ip6_dst_idev(skb->dst);
if (!(dev->flags & IFF_LOOPBACK) && (!np || np->mc_loop) &&
- ipv6_chk_mcast_addr(dev, &ipv6_hdr(skb)->daddr,
- &ipv6_hdr(skb)->saddr)) {
+ ((mroute6_socket && !(IP6CB(skb)->flags & IP6SKB_FORWARDED)) ||
+ ipv6_chk_mcast_addr(dev, &ipv6_hdr(skb)->daddr,
+ &ipv6_hdr(skb)->saddr))) {
struct sk_buff *newskb = skb_clone(skb, GFP_ATOMIC);
/* Do not check for IFF_ALLMULTI; multicast routing
