lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Thu, 8 Oct 2020 21:05:44 -0700 From: David Ahern <dsahern@...il.com> To: Jesper Dangaard Brouer <brouer@...hat.com>, bpf@...r.kernel.org Cc: netdev@...r.kernel.org, Daniel Borkmann <borkmann@...earbox.net>, Alexei Starovoitov <alexei.starovoitov@...il.com>, maze@...gle.com, lmb@...udflare.com, shaun@...era.io, Lorenzo Bianconi <lorenzo@...nel.org>, marek@...udflare.com, John Fastabend <john.fastabend@...il.com>, Jakub Kicinski <kuba@...nel.org>, eyal.birger@...il.com Subject: Re: [PATCH bpf-next V3 2/6] bpf: bpf_fib_lookup return MTU value as output when looked up On 10/8/20 7:09 AM, Jesper Dangaard Brouer wrote: > The BPF-helpers for FIB lookup (bpf_xdp_fib_lookup and bpf_skb_fib_lookup) > can perform MTU check and return BPF_FIB_LKUP_RET_FRAG_NEEDED. The BPF-prog > don't know the MTU value that caused this rejection. > > If the BPF-prog wants to implement PMTU (Path MTU Discovery) (rfc1191) it > need to know this MTU value for the ICMP packet. > > Patch change lookup and result struct bpf_fib_lookup, to contain this MTU > value as output via a union with 'tot_len' as this is the value used for > the MTU lookup. > > Signed-off-by: Jesper Dangaard Brouer <brouer@...hat.com> > --- > include/uapi/linux/bpf.h | 11 +++++++++-- > net/core/filter.c | 17 ++++++++++++----- > tools/include/uapi/linux/bpf.h | 11 +++++++++-- > 3 files changed, 30 insertions(+), 9 deletions(-) > Reviewed-by: David Ahern <dsahern@...il.com>
Powered by blists - more mailing lists