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ipv6: Allow the l3mdev to be a loopback

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There is no way currently for an IPv6 client connect using a loopback
address in a VRF, whereas for IPv4 the loopback address can be added:

    $ sudo ip addr add dev vrfred 127.0.0.1/8
    $ sudo ip -6 addr add ::1/128 dev vrfred
    RTNETLINK answers: Cannot assign requested address

So allow ::1 to be configured on an L3 master device. In order for
this to be usable ip_route_output_flags needs to not consider ::1 to
be a link scope address (since oif == l3mdev and so it would be
dropped), and ipv6_rcv needs to consider the l3mdev to be a loopback
device so that it doesn't drop the packets.

Signed-off-by: Robert Shearman <rshearma@vyatta.att-mail.com>
Signed-off-by: Mike Manning <mmanning@vyatta.att-mail.com>
Reviewed-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Robert Shearman 2018-09-19 13:56:53 +01:00 committed by David S. Miller
parent 1e6a4bc874
commit 3ede0bbcdf
3 changed files with 5 additions and 2 deletions
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1
net/ipv6/addrconf.c
View File

@ -997,6 +997,7 @@ ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg,
if (addr_type == IPV6_ADDR_ANY ||
addr_type & IPV6_ADDR_MULTICAST ||
(!(idev->dev->flags & IFF_LOOPBACK) &&
!netif_is_l3_master(idev->dev) &&
addr_type & IPV6_ADDR_LOOPBACK))
return ERR_PTR(-EADDRNOTAVAIL);

3
net/ipv6/ip6_input.c
View File

@ -178,7 +178,8 @@ static struct sk_buff *ip6_rcv_core(struct sk_buff *skb, struct net_device *dev,
*/
if ((ipv6_addr_loopback(&hdr->saddr) ||
ipv6_addr_loopback(&hdr->daddr)) &&
!(dev->flags & IFF_LOOPBACK))
!(dev->flags & IFF_LOOPBACK) &&
!netif_is_l3_master(dev))
goto err;
/* RFC4291 Errata ID: 3480

3
net/ipv6/route.c
View File

@ -2071,7 +2071,8 @@ struct dst_entry *ip6_route_output_flags(struct net *net, const struct sock *sk,
{
bool any_src;
if (rt6_need_strict(&fl6->daddr)) {
if (ipv6_addr_type(&fl6->daddr) &
(IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL)) {
struct dst_entry *dst;
dst = l3mdev_link_scope_lookup(net, fl6);