Re: [PATCH v2 bpf-next 0/3] bpf: Add MTU check to fib lookup helper

[Daniel Borkmann <daniel@iogearbox.net>]

On 05/21/2018 06:08 PM, dsahern@kernel.org wrote:
> From: David Ahern <dsahern@gmail.com>
> 
> Packets that exceed the egress MTU can not be forwarded in the fast path.
> Add IPv4 and IPv6 MTU helpers that take a FIB lookup result (versus the
> typical dst path) and add the calls to bpf_ipv{4,6}_fib_lookup.
> 
> v2
> - add ip6_mtu_from_fib6 to ipv6_stub
> - only call the new MTU helpers for fib lookups in XDP path; skb
>   path uses is_skb_forwardable to determine if the packet can be
>   sent via the egress device from the FIB lookup
> 
> David Ahern (3):
>   net/ipv4: Add helper to return path MTU based on fib result
>   net/ipv6: Add helper to return path MTU based on fib result
>   bpf: Add mtu checking to FIB forwarding helper
> 
>  include/net/addrconf.h   |  2 ++
>  include/net/ip6_fib.h    |  6 ++++++
>  include/net/ip6_route.h  |  3 +++
>  include/net/ip_fib.h     |  2 ++
>  net/core/filter.c        | 42 +++++++++++++++++++++++++++++++++++-------
>  net/ipv4/route.c         | 31 +++++++++++++++++++++++++++++++
>  net/ipv6/addrconf_core.c |  8 ++++++++
>  net/ipv6/af_inet6.c      |  1 +
>  net/ipv6/route.c         | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
>  9 files changed, 136 insertions(+), 7 deletions(-)

Applied to bpf-next, thanks David!