diff options
| author | David L Stevens <dlstevens@us.ibm.com> | 2007-05-09 13:53:44 -0700 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2007-05-10 23:45:32 -0700 |
| commit | 5bb1ab09e4f6287c0b6c9cdbd463147cbd003f54 (patch) | |
| tree | 7511b9e3963c9f43d53ad5fec8627c927c632e09 | |
| parent | ac40e41f4ddec8882d3f7bc8fa98a4fce8796aff (diff) | |
[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>
| -rw-r--r-- | net/ipv6/ip6_output.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c index f508171bab7..4704b5fc308 100644 --- a/net/ipv6/ip6_output.c +++ b/net/ipv6/ip6_output.c @@ -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)) { |