From patchwork Mon May 20 21:42:38 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christian Hopps X-Patchwork-Id: 13668696 Received: from smtp.chopps.org (smtp.chopps.org [54.88.81.56]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 82F4C1386AB for ; Mon, 20 May 2024 21:50:53 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=54.88.81.56 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716241854; cv=none; b=mV1xsPvwp1FKBsHERDcoZdas9orEJ+aMMXRLAEG+HX2Q04IAXPhmyjWAtEdIT0Wet/LkicY9dUX0ASspuJLGqZ9A/RPvQqwKeJwMC95GC1VS2LTiqsla/PRbOzQ2z+Z6xo8plZdQvnB/XZU/0A06bihAldUiux0Ib5oL/FPoX/8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716241854; c=relaxed/simple; bh=wrVmQG3q0c2EgtNe4UTuowNxoiN2Gi47CrhEmr4FuyM=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=Qn6PGMyxlwoQRSGpExmqZUjE0QD6tO/CGPRBX2pOOm70HURYhH2z4nxzSnnD78Zow5lBCyIgdsD7LI9zauGvezMFPlrzb+Buyy6XWRLFb5TmLqVTdqXWx61cSPL/+wsSSEX7BMKW9FL2kNgwr8t/zysMKdLOr8tajF5us+8BeZE= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=chopps.org; spf=fail smtp.mailfrom=chopps.org; arc=none smtp.client-ip=54.88.81.56 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=chopps.org Authentication-Results: smtp.subspace.kernel.org; spf=fail smtp.mailfrom=chopps.org Received: from labnh.int.chopps.org (syn-172-222-091-149.res.spectrum.com [172.222.91.149]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (Client did not present a certificate) by smtp.chopps.org (Postfix) with ESMTPSA id D528A7D06F; Mon, 20 May 2024 21:43:37 +0000 (UTC) From: Christian Hopps To: devel@linux-ipsec.org Cc: Steffen Klassert , netdev@vger.kernel.org, Christian Hopps , Christian Hopps Subject: [PATCH ipsec-next v1 0/8] Add IP-TFS mode to xfrm Date: Mon, 20 May 2024 17:42:38 -0400 Message-ID: <20240520214255.2590923-1-chopps@chopps.org> X-Mailer: git-send-email 2.45.1 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Christian Hopps 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 8 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.