netdev - [PATCH bpf-next v3 0/2] bpf: Add ipip6 and ip6ip decap support for bpf_skb_adjust

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Message-ID: <cover.1673574419.git.william.xuanziyang@huawei.com>
Date:   Fri, 13 Jan 2023 17:24:36 +0800
From:   Ziyang Xuan <william.xuanziyang@...wei.com>
To:     <ast@...nel.org>, <daniel@...earbox.net>, <andrii@...nel.org>,
        <davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
        <pabeni@...hat.com>, <willemb@...gle.com>, <bpf@...r.kernel.org>,
        <netdev@...r.kernel.org>, <martin.lau@...ux.dev>,
        <song@...nel.org>, <yhs@...com>, <john.fastabend@...il.com>,
        <kpsingh@...nel.org>, <sdf@...gle.com>, <haoluo@...gle.com>,
        <jolsa@...nel.org>
Subject: [PATCH bpf-next v3 0/2] bpf: Add ipip6 and ip6ip decap support for bpf_skb_adjust_room()

Add ipip6 and ip6ip decap support for bpf_skb_adjust_room().
Main use case is for using cls_bpf on ingress hook to decapsulate
IPv4 over IPv6 and IPv6 over IPv4 tunnel packets.

And add ipip6 and ip6ip decap testcases to verify that
bpf_skb_adjust_room() correctly decapsulate ipip6 and ip6ip
tunnel packets.

$./test_tc_tunnel.sh
ipip
encap 192.168.1.1 to 192.168.1.2, type ipip, mac none len 100
test basic connectivity
0
test bpf encap without decap (expect failure)
Ncat: TIMEOUT.
1
test bpf encap with tunnel device decap
0
test bpf encap with bpf decap
0
OK
ipip6
encap 192.168.1.1 to 192.168.1.2, type ipip6, mac none len 100
test basic connectivity
0
test bpf encap without decap (expect failure)
Ncat: TIMEOUT.
1
test bpf encap with tunnel device decap
0
test bpf encap with bpf decap
0
OK
ip6ip6
encap fd::1 to fd::2, type ip6tnl, mac none len 100
test basic connectivity
0
test bpf encap without decap (expect failure)
Ncat: TIMEOUT.
1
test bpf encap with tunnel device decap
0
test bpf encap with bpf decap
0
OK
sit
encap fd::1 to fd::2, type sit, mac none len 100
test basic connectivity
0
test bpf encap without decap (expect failure)
Ncat: TIMEOUT.
1
test bpf encap with tunnel device decap
0
test bpf encap with bpf decap
0
OK
...
OK. All tests passed

v3:
  - Fix compilation failure of selftests/bpf.
  - Combine two new branches in bpf_skb_adjust_room().
  - Simplify description for new flags BPF_F_ADJ_ROOM_DECAP_L3_IP*. 

v2:
  - Use decap flags to indicate the new IP header.
    Do not rely on skb->encapsulation.

Ziyang Xuan (2):
  bpf: Add ipip6 and ip6ip decap support for bpf_skb_adjust_room()
  selftests/bpf: add ipip6 and ip6ip decap to test_tc_tunnel

 include/uapi/linux/bpf.h                      |  7 ++
 net/core/filter.c                             | 31 ++++++-
 tools/include/uapi/linux/bpf.h                |  7 ++
 .../selftests/bpf/progs/test_tc_tunnel.c      | 91 ++++++++++++++++++-
 tools/testing/selftests/bpf/test_tc_tunnel.sh | 15 +--
 5 files changed, 142 insertions(+), 9 deletions(-)

-- 
2.25.1