netdev - [PATCH ipsec-next v2 0/3] xfrm: policy: replace session decode with flow dissector

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Date: Fri, 29 Sep 2023 14:58:39 +0200
From: Florian Westphal <fw@...len.de>
To: <netdev@...r.kernel.org>
Cc: steffen.klassert@...unet.com,
	herbert@...dor.apana.org.au,
	Florian Westphal <fw@...len.de>
Subject: [PATCH ipsec-next v2 0/3] xfrm: policy: replace session decode with flow dissector

Remove the ipv4+ipv6 session decode functions and use generic flow
dissector to populate the flowi for the policy lookup.

Changes since v1:
- Can't use skb_flow_dissect(), we might see skbs that have neither
  skb->sk nor skb->dev set. Flow dissector WARN()s in this case, it
  tries to check for a bpf program assigned in that net namespace.

Add a preparation patch to pass down 'struct net' in
xfrm_decode_session so its available for use in patch 3.

Changes since RFC:

 - Drop mobility header support.  I don't think that anyone uses
   this.  MOBIKE doesn't appear to need this either.
 - Drop fl6->flowlabel assignment, original code leaves it as 0.

There is no reason for this change other than to remove code.

Florian Westphal (3):
  xfrm: pass struct net to xfrm_decode_session wrappers
  xfrm: move mark and oif flowi decode into common code
  xfrm: policy: replace session decode with flow dissector

 include/net/xfrm.h             |  10 +-
 net/ipv4/icmp.c                |   2 +-
 net/ipv4/ip_vti.c              |   4 +-
 net/ipv4/netfilter.c           |   2 +-
 net/ipv6/icmp.c                |   2 +-
 net/ipv6/ip6_vti.c             |   4 +-
 net/ipv6/netfilter.c           |   2 +-
 net/netfilter/nf_nat_proto.c   |   2 +-
 net/xfrm/xfrm_interface_core.c |   4 +-
 net/xfrm/xfrm_policy.c         | 287 +++++++++++++--------------------
 10 files changed, 128 insertions(+), 191 deletions(-)

-- 
2.41.0