[ovs-dev] [PATCH net-next v5] openvswitch: add TTL decrement action

[David Miller]

From: Matteo Croce <mcroce at redhat.com>
Date: Sat, 15 Feb 2020 14:20:56 +0100

> New action to decrement TTL instead of setting it to a fixed value.
> This action will decrement the TTL and, in case of expired TTL, drop it
> or execute an action passed via a nested attribute.
> The default TTL expired action is to drop the packet.
> 
> Supports both IPv4 and IPv6 via the ttl and hop_limit fields, respectively.
> 
> Tested with a corresponding change in the userspace:
> 
>     # ovs-dpctl dump-flows
>     in_port(2),eth(),eth_type(0x0800), packets:0, bytes:0, used:never, actions:dec_ttl{ttl<=1 action:(drop)},1
>     in_port(1),eth(),eth_type(0x0800), packets:0, bytes:0, used:never, actions:dec_ttl{ttl<=1 action:(drop)},2
>     in_port(1),eth(),eth_type(0x0806), packets:0, bytes:0, used:never, actions:2
>     in_port(2),eth(),eth_type(0x0806), packets:0, bytes:0, used:never, actions:1
> 
>     # ping -c1 192.168.0.2 -t 42
>     IP (tos 0x0, ttl 41, id 61647, offset 0, flags [DF], proto ICMP (1), length 84)
>         192.168.0.1 > 192.168.0.2: ICMP echo request, id 386, seq 1, length 64
>     # ping -c1 192.168.0.2 -t 120
>     IP (tos 0x0, ttl 119, id 62070, offset 0, flags [DF], proto ICMP (1), length 84)
>         192.168.0.1 > 192.168.0.2: ICMP echo request, id 388, seq 1, length 64
>     # ping -c1 192.168.0.2 -t 1
>     #
> 
> Co-developed-by: Bindiya Kurle <bindiyakurle at gmail.com>
> Signed-off-by: Bindiya Kurle <bindiyakurle at gmail.com>
> Signed-off-by: Matteo Croce <mcroce at redhat.com>

Applied.