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[IPV6] MROUTE: Support multicast forwarding.

Browse source 
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>
This commit is contained in:
YOSHIFUJI Hideaki 2008-04-03 09:22:53 +09:00
parent 80a9492a33
commit 7bc570c8b4
13 changed files with 1751 additions and 27 deletions
Download patch file Download diff file Expand all files Collapse all files

81
net/ipv6/ip6_input.c
View file

@ -29,6 +29,7 @@
#include <linux/netdevice.h>
#include <linux/in6.h>
#include <linux/icmpv6.h>
#include <linux/mroute6.h>
#include <linux/netfilter.h>
#include <linux/netfilter_ipv6.h>
@ -236,36 +237,84 @@ int ip6_mc_input(struct sk_buff *skb)
hdr = ipv6_hdr(skb);
deliver = ipv6_chk_mcast_addr(skb->dev, &hdr->daddr, NULL);
#ifdef CONFIG_IPV6_MROUTE
/*
* IPv6 multicast router mode isnt currently supported.
* IPv6 multicast router mode is now supported ;)
*/
#if 0
if (ipv6_config.multicast_route) {
int addr_type;
if (ipv6_devconf.mc_forwarding &&
likely(!(IP6CB(skb)->flags & IP6SKB_FORWARDED))) {
/*
* Okay, we try to forward - split and duplicate
* packets.
*/
struct sk_buff *skb2;
struct inet6_skb_parm *opt = IP6CB(skb);
addr_type = ipv6_addr_type(&hdr->daddr);
/* Check for MLD */
if (unlikely(opt->ra)) {
/* Check if this is a mld message */
u8 *ptr = skb_network_header(skb) + opt->ra;
struct icmp6hdr *icmp6;
u8 nexthdr = hdr->nexthdr;
int offset;
if (!(addr_type & (IPV6_ADDR_LOOPBACK | IPV6_ADDR_LINKLOCAL))) {
struct sk_buff *skb2;
struct dst_entry *dst;
/* Check if the value of Router Alert
* is for MLD (0x0000).
*/
if ((ptr[2] | ptr[3]) == 0) {
if (!ipv6_ext_hdr(nexthdr)) {
/* BUG */
goto discard;
}
offset = ipv6_skip_exthdr(skb, sizeof(*hdr),
&nexthdr);
if (offset < 0)
goto discard;
dst = skb->dst;
if (nexthdr != IPPROTO_ICMPV6)
goto discard;
if (deliver) {
skb2 = skb_clone(skb, GFP_ATOMIC);
dst_output(skb2);
} else {
dst_output(skb);
return 0;
if (!pskb_may_pull(skb, (skb_network_header(skb) +
offset + 1 - skb->data)))
goto discard;
icmp6 = (struct icmp6hdr *)(skb_network_header(skb) + offset);
switch (icmp6->icmp6_type) {
case ICMPV6_MGM_QUERY:
case ICMPV6_MGM_REPORT:
case ICMPV6_MGM_REDUCTION:
case ICMPV6_MLD2_REPORT:
break;
default:
/* Bogus */
goto discard;
}
deliver = 1;
goto out;
}
/* unknown RA - process it normally */
}
if (deliver)
skb2 = skb_clone(skb, GFP_ATOMIC);
else {
skb2 = skb;
skb = NULL;
}
if (skb2) {
skb2->dev = skb2->dst->dev;
ip6_mr_input(skb2);
}
}
#endif
out:
if (likely(deliver)) {
ip6_input(skb);
return 0;
}
discard:
/* discard */
kfree_skb(skb);