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[IPV6]: Send ICMPv6 error on scope violations. 

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.

Signed-off-by: David L Stevens <dlstevens@us.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David L Stevens 2007-05-09 13:53:44 -07:00 committed by David S. Miller
parent ac40e41f4d
commit 5bb1ab09e4
1 changed files with 10 additions and 3 deletions
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13
net/ipv6/ip6_output.c
View File

@ -463,10 +463,17 @@ 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)) {