[PATCHv3 net] openvswitch: Don't validate IPv6 label masks.

[PATCHv3 net] openvswitch: Don't validate IPv6 label masks.

[Joe Stringer]

When userspace doesn't provide a mask, OVS datapath generates a fully
unwildcarded mask for the flow by copying the flow and setting all bits
in all fields. For IPv6 label, this creates a mask that matches on the
upper 12 bits, causing the following error:

openvswitch: netlink: Invalid IPv6 flow label value (value=ffffffff, max=fffff)

This patch ignores the label validation check for masks, avoiding this
error.

Signed-off-by: Joe Stringer <joestringer@nicira.com>
---
v3: Alternative approach.
    Was "openvswitch: Fix mask generation for IPv6 labels."
v2: OR lower 20 bits (upper 12 bits remain from earlier memdup)
---
 net/openvswitch/flow_netlink.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/openvswitch/flow_netlink.c b/net/openvswitch/flow_netlink.c
index fa4ec2e..089b195 100644
--- a/net/openvswitch/flow_netlink.c
+++ b/net/openvswitch/flow_netlink.c
@@ -690,7 +690,7 @@ static int ovs_key_from_nlattrs(struct sw_flow_match *match, u64 attrs,
 			return -EINVAL;
 		}
 
-		if (ipv6_key->ipv6_label & htonl(0xFFF00000)) {
+		if (!is_mask && ipv6_key->ipv6_label & htonl(0xFFF00000)) {
 			OVS_NLERR("IPv6 flow label %x is out of range (max=%x).\n",
 				  ntohl(ipv6_key->ipv6_label), (1 << 20) - 1);
 			return -EINVAL;
-- 
1.7.10.4

Re: [PATCHv3 net] openvswitch: Don't validate IPv6 label masks.

[Pravin Shelar]

On Wed, Nov 19, 2014 at 1:54 PM, Joe Stringer <joestringer@nicira.com> wrote:
> When userspace doesn't provide a mask, OVS datapath generates a fully
> unwildcarded mask for the flow by copying the flow and setting all bits
> in all fields. For IPv6 label, this creates a mask that matches on the
> upper 12 bits, causing the following error:
>
> openvswitch: netlink: Invalid IPv6 flow label value (value=ffffffff, max=fffff)
>
> This patch ignores the label validation check for masks, avoiding this
> error.
>
> Signed-off-by: Joe Stringer <joestringer@nicira.com>

Thanks for the fix.
Acked-by: Pravin B Shelar <pshelar@nicira.com>

> ---
> v3: Alternative approach.
>     Was "openvswitch: Fix mask generation for IPv6 labels."
> v2: OR lower 20 bits (upper 12 bits remain from earlier memdup)
> ---
>  net/openvswitch/flow_netlink.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/net/openvswitch/flow_netlink.c b/net/openvswitch/flow_netlink.c
> index fa4ec2e..089b195 100644
> --- a/net/openvswitch/flow_netlink.c
> +++ b/net/openvswitch/flow_netlink.c
> @@ -690,7 +690,7 @@ static int ovs_key_from_nlattrs(struct sw_flow_match *match, u64 attrs,
>                         return -EINVAL;
>                 }
>
> -               if (ipv6_key->ipv6_label & htonl(0xFFF00000)) {
> +               if (!is_mask && ipv6_key->ipv6_label & htonl(0xFFF00000)) {
>                         OVS_NLERR("IPv6 flow label %x is out of range (max=%x).\n",
>                                   ntohl(ipv6_key->ipv6_label), (1 << 20) - 1);
>                         return -EINVAL;
> --
> 1.7.10.4
>

Re: [PATCHv3 net] openvswitch: Don't validate IPv6 label masks.

[David Miller]

From: Joe Stringer <joestringer@nicira.com>
Date: Wed, 19 Nov 2014 13:54:49 -0800

> When userspace doesn't provide a mask, OVS datapath generates a fully
> unwildcarded mask for the flow by copying the flow and setting all bits
> in all fields. For IPv6 label, this creates a mask that matches on the
> upper 12 bits, causing the following error:
> 
> openvswitch: netlink: Invalid IPv6 flow label value (value=ffffffff, max=fffff)
> 
> This patch ignores the label validation check for masks, avoiding this
> error.
> 
> Signed-off-by: Joe Stringer <joestringer@nicira.com>
> ---
> v3: Alternative approach.
>     Was "openvswitch: Fix mask generation for IPv6 labels."
> v2: OR lower 20 bits (upper 12 bits remain from earlier memdup)

Applied.