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Message-ID: <20240607054041.2032352-1-chopps@chopps.org>
Date: Fri, 7 Jun 2024 01:40:24 -0400
From: Christian Hopps <chopps@...pps.org>
To: devel@...ux-ipsec.org
Cc: Steffen Klassert <steffen.klassert@...unet.com>,
netdev@...r.kernel.org,
Christian Hopps <chopps@...pps.org>,
Christian Hopps <chopps@...n.net>
Subject: [PATCH ipsec-next v2 0/17] Add IP-TFS mode to xfrm
From: Christian Hopps <chopps@...n.net>
* Summary of Changes:
This patchset adds a new xfrm mode implementing on-demand IP-TFS. IP-TFS
(AggFrag encapsulation) has been standardized in RFC9347.
Link: https://www.rfc-editor.org/rfc/rfc9347.txt
This feature supports demand driven (i.e., non-constant send rate)
IP-TFS to take advantage of the AGGFRAG ESP payload encapsulation. This
payload type supports aggregation and fragmentation of the inner IP
packet stream which in turn yields higher small-packet bandwidth as well
as reducing MTU/PMTU issues. Congestion control is unimplementated as
the send rate is demand driven rather than constant.
In order to allow loading this fucntionality as a module a set of
callbacks xfrm_mode_cbs has been added to xfrm as well.
Patchset Changes:
-----------------
23 files changed, 3252 insertions(+), 19 deletions(-)
Documentation/networking/xfrm_sysctl.rst | 30 +
include/net/netns/xfrm.h | 6 +
include/net/xfrm.h | 40 +
include/uapi/linux/in.h | 2 +
include/uapi/linux/ip.h | 16 +
include/uapi/linux/ipsec.h | 3 +-
include/uapi/linux/snmp.h | 3 +
include/uapi/linux/xfrm.h | 9 +-
net/ipv4/esp4.c | 3 +-
net/ipv6/esp6.c | 3 +-
net/netfilter/nft_xfrm.c | 3 +-
net/xfrm/Makefile | 1 +
net/xfrm/trace_iptfs.h | 218 +++
net/xfrm/xfrm_compat.c | 10 +-
net/xfrm/xfrm_device.c | 4 +-
net/xfrm/xfrm_input.c | 14 +-
net/xfrm/xfrm_iptfs.c | 2741 ++++++++++++++++++++++++++++++
net/xfrm/xfrm_output.c | 6 +
net/xfrm/xfrm_policy.c | 26 +-
net/xfrm/xfrm_proc.c | 3 +
net/xfrm/xfrm_state.c | 60 +
net/xfrm/xfrm_sysctl.c | 38 +
net/xfrm/xfrm_user.c | 32 +
Patchset Structure:
-------------------
The first 7 commits are changes to the xfrm infrastructure to support
the callbacks as well as more generic IP-TFS additions that may be used
outside the actual IP-TFS implementation.
- iptfs: config: add CONFIG_XFRM_IPTFS
- iptfs: uapi: ip: add ip_tfs_*_hdr packet formats
- iptfs: uapi: IPPROTO_AGGFRAG AGGFRAG in ESP
- iptfs: sysctl: allow configuration of global default values
- iptfs: netlink: add config (netlink) options
- iptfs: xfrm: Add mode_cbs module functionality
- iptfs: xfrm: add generic iptfs defines and functionality
The last 9+1 commits constitute the IP-TFS implementation constructed in
layers to make review easier. The first 9 commits all apply to a single
file `net/xfrm/xfrm_iptfs.c`, the last commit adds a new tracepoint
header file along with the use of these new tracepoint calls.
- iptfs: impl: add new iptfs xfrm mode impl
- iptfs: impl: add user packet (tunnel ingress) handling
- iptfs: impl: share page fragments of inner packets
- iptfs: impl: add fragmenting of larger than MTU user packets
- iptfs: impl: add basic receive packet (tunnel egress) handling
- iptfs: impl: handle received fragmented inner packets
- iptfs: impl: add reusing received skb for the tunnel egress packet
- iptfs: impl: add skb-fragment sharing code
- iptfs: impl: handle reordering of received packets
- iptfs: impl: add tracepoint functionality
Patchset History:
-----------------
RFCv1 (11/10/2023)
RFCv1 -> RFCv2 (11/12/2023)
Updates based on feedback from Simon Horman, Antony,
Michael Richardson, and kernel test robot.
RFCv2 -> v1 (2/19/2024)
Updates based on feedback from Sabrina Dubroca, kernel test robot
v1 -> v2 (5/19/2024)
Updates based on feedback from Sabrina Dubroca, Simon Horman, Antony.
o Add handling of new netlink SA direction attribute (Antony).
o Split single patch/commit of xfrm_iptfs.c (the actual IP-TFS impl)
into 9+1 distinct layered functionality commits for aiding review.
- xfrm: fix return check on clone() callback
- xfrm: add sa_len() callback in xfrm_mode_cbs for copy to user
- iptfs: remove unneeded skb free count variable
- iptfs: remove unused variable and "breadcrumb" for future code.
- iptfs: use do_div() to avoid "__udivd13 missing" link failure.
- iptfs: remove some BUG_ON() assertions questioned in review.
v2->v3
- iptfs: copy only the netlink attributes to user based on the
direction of the SA.
- xfrm: stats: in the output path check for skb->dev == NULL prior to
setting xfrm statistics on dev_net(skb->dev) as skb->dev may be NULL
for locally generated packets.
- xfrm: stats: fix an input use case where dev_net(skb->dev) is used
to inc stats after skb is possibly NULL'd earlier. Switch to using
existing saved `net` pointer.
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