When an IPv6 router is forwarding a packet with a link-local scope source
address off-link, RFC 4007 requires it to send an ICMPv6 destination
unreachable with code 2 ("not neighbor"), but Linux doesn't. Fix below.
+-DLS
[in-line for viewing, attached for applying]
Signed-off-by: David L Stevens <[EMAIL PROTECTED]>
--- linux-2.6.20.7/net/ipv6/ip6_output.c 2007-04-13
13:48:14.000000000 -0700
+++ linux-2.6.20.7T1/net/ipv6/ip6_output.c 2007-05-09
12:32:45.000000000 -0700
@@ -449,10 +449,17 @@ int ip6_forward(struct sk_buff *skb)
*/
if (xrlim_allow(dst, 1*HZ))
ndisc_send_redirect(skb, n, target);
- } else if
(ipv6_addr_type(&hdr->saddr)&(IPV6_ADDR_MULTICAST|IPV6_ADDR_LOOPBACK
- |IPV6_ADDR_LINKLOCAL)) {
+ } else {
+ int addrtype = ipv6_addr_type(&hdr->saddr);
+
/* This check is security critical. */
- goto error;
+ if (addrtype & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LOOPBACK))
+ goto error;
+ if (addrtype & IPV6_ADDR_LINKLOCAL) {
+ icmpv6_send(skb, ICMPV6_DEST_UNREACH,
+ ICMPV6_NOT_NEIGHBOUR, 0, skb->dev);
+ goto error;
+ }
}
if (skb->len > dst_mtu(dst)) {
icmp6fix.patch
Description: Binary data
