From nobody Thu Dec 18 06:17:22 2025 Received: from mail-wr1-f47.google.com (mail-wr1-f47.google.com [209.85.221.47]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9CE7E2951C7 for ; Tue, 15 Apr 2025 11:17:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.221.47 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744715859; cv=none; b=hGXWCOLjKmCTqhHBNey/DqQbD+rOBKVS9ORM66cMH6MdD+ocfOTZI6P6z2xpodwbuPo9rKZ5FzI0k1PDhSBcvk93zi3G1/YcC3+258eM/YHQ9wxmqa0WjAOihtJdYGV0hpvNmFGE6Cn6mFbog4FufrqGkzaoMqIc9D+K+X5WjJo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744715859; c=relaxed/simple; bh=OynMgFdMemAdhPCqB9V4/6xUlIRYf7PzhNDlFf33DZY=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=LI2vEPVPa85M1YePxP9VFEioYKAFhavWJ3yZYeGo6k9BvW2WSM9pecHE6rTXC3JGufcOJYxMcTOG1vP28KSIJLdfTQ2cQSyn+dWXSBWIaTkzWFHnFKLEFIJWTbAyVWSuYP8HH2gw15mmL6iQPMfSWHmTiaVmRG8KMLRWrhKRxnM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=openvpn.net; spf=pass smtp.mailfrom=openvpn.com; dkim=pass (2048-bit key) header.d=openvpn.net header.i=@openvpn.net header.b=CBWFRxto; arc=none smtp.client-ip=209.85.221.47 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=openvpn.net Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=openvpn.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=openvpn.net header.i=@openvpn.net header.b="CBWFRxto" Received: by mail-wr1-f47.google.com with SMTP id ffacd0b85a97d-39ac56756f6so4690629f8f.2 for ; Tue, 15 Apr 2025 04:17:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=openvpn.net; s=google; t=1744715854; x=1745320654; darn=vger.kernel.org; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:from:to:cc:subject:date:message-id :reply-to; bh=8nNTItU3nsfj9boXY9j/2t3L2XCYhom564qER2zj9rg=; b=CBWFRxtoOWAlBQSI0RMy96wNj3JgCk0WobcWgFpe8UJ1SBja+P7UI3FE2UDLz7ZbZw H9/VlGKXynKipZ0N8i/SqLWStfdFPV49C7OJXoLdzMB1Jew1QAZikU4hfWVuDilYjSUa SQ6oTDP3YOK/HduV7Fx5eBC6mETydl6z9n5+nwCqksEGiLzcl5UkmVgBtIF4YZAxHDOy VTdFYB/5J4A2V4RIcCQzwykD1d4M9ozoCFJZ75JywVV+NOmKS+39VYoJ+W3hmEQ11iQ4 JJkezOTjHhHprdS+wqkMnfYxtto3PM6/4N0von95Jk4iSnLRd1Fs5Dv5O05eeewK3/JD uHNQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1744715854; x=1745320654; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=8nNTItU3nsfj9boXY9j/2t3L2XCYhom564qER2zj9rg=; b=hH/HPwS7ZqMkIg+2I1X3guWJsQ+UUm+/MqZTlZveJVYK6h2GqfOkd/EmSNX1rRxXDf JvJcdKjDJhO8iDdWOIOdAFZ4nVA06ltqSKLYoy3MrNKW/cEayVgxVHgGYV8jLAsNJjR6 xSxMXE2nsqzeIibAG3erk9s0jZemP0U4scnglVI0Ybuk+pj5DBmSBnFXHVQz6/n/pB+7 XjAOQ7Zb+6O8bRkgd3pgm+8A09XwlSn0ViC/3sr3omZWsQTngtvsNiIh4IDgyGA/cOCe xgw91AbEIKUmODuUxUP3DjMde/JKm882rqFBYL8Sp8k0d2ptu19EzAJNnUlf3l6FdXwE ulow== X-Forwarded-Encrypted: i=1; AJvYcCWSk9hO3W3WmDTGEsPh029XgsREdZ/1H8+aDsyUzU8NZHJ4ma28AZLwgCO7MEZ6AhQduU0mtb0c5KA4zU4=@vger.kernel.org X-Gm-Message-State: AOJu0YwrcG84NOD9BViTKIO5NiGqmQ38U/eckqRMsnHtK9OA6ftuAtl9 mfVU9fvnjS3ayYwl4K4gNulRjoGc6qotQvHFrnEWKC2Lf84RzEDEpi+RMwF/bilBh73gXI/tpgg gKDG4kv8iqSVlbTGrWNEc6Lk0RUCdl03wV8uOU71k3UsCjV8iiTxd8+8= X-Gm-Gg: ASbGncsryir0zRDkjpS4r/Ia/Fw72X/Scu3u/nzhRnhWFq2DPqQbdU8P5JuOAZ51bsc iss5VbcAmwwIDxtLW9opYw4LyOLBg4zZK+bMjS/6dDHCHsYByQK2Rp7aDreREU1dyoSBQZQKWT1 rfOCviPOz2Cc8gza9c6FpXY9gBtEGX2IMspf0y+ZgmXbfiJ/IdSic4zk3hcW57rIxafEk9d5oON xUilvDRBWdMk+LRflQb16I4FzA+54WAS2UeP41TphbuWvx34lbVBLY33JFtu0t3Lke4GVyObLG0 zXivQ15eYeEBy+Q/8x1GrnBxB3fYPI0u405HWg== X-Google-Smtp-Source: AGHT+IFg0Ph87qXX51dfMOb+Hyq0PFSa7u7iyTUclPQv6T2CZUAujmwXQS/9lHILpefrpe9/NDXoWg== X-Received: by 2002:a5d:6d84:0:b0:39d:8d54:5eac with SMTP id ffacd0b85a97d-39ea51f44ccmr13591723f8f.11.1744715850844; Tue, 15 Apr 2025 04:17:30 -0700 (PDT) Received: from [127.0.0.1] ([2001:67c:2fbc:1:83ac:73b4:720f:dc99]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-43f2066d26bsm210836255e9.22.2025.04.15.04.17.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 15 Apr 2025 04:17:30 -0700 (PDT) From: Antonio Quartulli Date: Tue, 15 Apr 2025 13:17:22 +0200 Subject: [PATCH net-next v26 05/23] ovpn: introduce the ovpn_peer object Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20250415-b4-ovpn-v26-5-577f6097b964@openvpn.net> References: <20250415-b4-ovpn-v26-0-577f6097b964@openvpn.net> In-Reply-To: <20250415-b4-ovpn-v26-0-577f6097b964@openvpn.net> To: netdev@vger.kernel.org, Eric Dumazet , Jakub Kicinski , Paolo Abeni , Donald Hunter , Antonio Quartulli , Shuah Khan , sd@queasysnail.net, ryazanov.s.a@gmail.com, Andrew Lunn Cc: Simon Horman , linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, Xiao Liang X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=22796; i=antonio@openvpn.net; h=from:subject:message-id; bh=OynMgFdMemAdhPCqB9V4/6xUlIRYf7PzhNDlFf33DZY=; b=owEBbQGS/pANAwAIAQtw5TqgONWHAcsmYgBn/kBBYvYFxSI3rh2HVwSY/4asXa/kg7U3GDWyc rMTeDK7AeOJATMEAAEIAB0WIQSZq9xs+NQS5N5fwPwLcOU6oDjVhwUCZ/5AQQAKCRALcOU6oDjV h5CdB/9kVj1HHiJFvlu1taWqOB/kJTrXWKdf4NfF/H+CPVAB41xAYuqe/qzgIVZs71VWdDgSElL 1hDRcqqu/DoyzQouI6PbOTfomFUlh6yzOE9r0v2QaTQsLzN2x3H+DNdb7xFA8GBlWuPyzCOtyXH PXEjZ6LgeZ1y+uYhey3C/2auRe5hxcLCcZMEDMcQAUYZihcrdz020rmJT2GLLDC87D731OaUuzB A6l693ckh9PsMGogW9yZZE/4szOT2qsNb/y5idquDcEXB/YR/9cst8AX25BI2hWevoyfdLiZE5+ XrZxjX+wqxBM32K6932CKRyn4f/RViWdftCTXPLoHqQCYe3V X-Developer-Key: i=antonio@openvpn.net; a=openpgp; fpr=CABDA1282017C267219885C748F0CCB68F59D14C An ovpn_peer object holds the whole status of a remote peer (regardless whether it is a server or a client). This includes status for crypto, tx/rx buffers, napi, etc. Only support for one peer is introduced (P2P mode). Multi peer support is introduced with a later patch. Along with the ovpn_peer, also the ovpn_bind object is introcued as the two are strictly related. An ovpn_bind object wraps a sockaddr representing the local coordinates being used to talk to a specific peer. Signed-off-by: Antonio Quartulli --- drivers/net/Kconfig | 1 + drivers/net/ovpn/Makefile | 2 + drivers/net/ovpn/bind.c | 58 +++++++ drivers/net/ovpn/bind.h | 101 +++++++++++ drivers/net/ovpn/main.c | 14 +- drivers/net/ovpn/ovpnpriv.h | 4 + drivers/net/ovpn/peer.c | 411 ++++++++++++++++++++++++++++++++++++++++= ++++ drivers/net/ovpn/peer.h | 80 +++++++++ 8 files changed, 670 insertions(+), 1 deletion(-) diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig index 5fbe25ae1e11e558aa9aaa857cf110127e459854..2806fcc22a2dbd9b2985b09dd6e= f65dd1dc4ebc1 100644 --- a/drivers/net/Kconfig +++ b/drivers/net/Kconfig @@ -119,6 +119,7 @@ config OVPN tristate "OpenVPN data channel offload" depends on NET && INET depends on IPV6 || !IPV6 + select DST_CACHE help This module enhances the performance of the OpenVPN userspace software by offloading the data channel processing to kernelspace. diff --git a/drivers/net/ovpn/Makefile b/drivers/net/ovpn/Makefile index 0e5f686672fb5052cee5a2c28797b70859514a7f..618328ae338861b9764b42485df= 71ebd0fc1fe90 100644 --- a/drivers/net/ovpn/Makefile +++ b/drivers/net/ovpn/Makefile @@ -7,7 +7,9 @@ # Author: Antonio Quartulli =20 obj-$(CONFIG_OVPN) :=3D ovpn.o +ovpn-y +=3D bind.o ovpn-y +=3D main.o ovpn-y +=3D io.o ovpn-y +=3D netlink.o ovpn-y +=3D netlink-gen.o +ovpn-y +=3D peer.o diff --git a/drivers/net/ovpn/bind.c b/drivers/net/ovpn/bind.c new file mode 100644 index 0000000000000000000000000000000000000000..d4a1aeed12c99c71eaf5e8e9fc9= c0fe61af6aaac --- /dev/null +++ b/drivers/net/ovpn/bind.c @@ -0,0 +1,58 @@ +// SPDX-License-Identifier: GPL-2.0 +/* OpenVPN data channel offload + * + * Copyright (C) 2012-2025 OpenVPN, Inc. + * + * Author: James Yonan + * Antonio Quartulli + */ + +#include +#include + +#include "ovpnpriv.h" +#include "bind.h" +#include "peer.h" + +/** + * ovpn_bind_from_sockaddr - retrieve binding matching sockaddr + * @ss: the sockaddr to match + * + * Return: the bind matching the passed sockaddr if found, NULL otherwise + */ +struct ovpn_bind *ovpn_bind_from_sockaddr(const struct sockaddr_storage *s= s) +{ + struct ovpn_bind *bind; + size_t sa_len; + + if (ss->ss_family =3D=3D AF_INET) + sa_len =3D sizeof(struct sockaddr_in); + else if (ss->ss_family =3D=3D AF_INET6) + sa_len =3D sizeof(struct sockaddr_in6); + else + return ERR_PTR(-EAFNOSUPPORT); + + bind =3D kzalloc(sizeof(*bind), GFP_ATOMIC); + if (unlikely(!bind)) + return ERR_PTR(-ENOMEM); + + memcpy(&bind->remote, ss, sa_len); + + return bind; +} + +/** + * ovpn_bind_reset - assign new binding to peer + * @peer: the peer whose binding has to be replaced + * @new: the new bind to assign + */ +void ovpn_bind_reset(struct ovpn_peer *peer, struct ovpn_bind *new) +{ + struct ovpn_bind *old; + + spin_lock_bh(&peer->lock); + old =3D rcu_replace_pointer(peer->bind, new, true); + spin_unlock_bh(&peer->lock); + + kfree_rcu(old, rcu); +} diff --git a/drivers/net/ovpn/bind.h b/drivers/net/ovpn/bind.h new file mode 100644 index 0000000000000000000000000000000000000000..4e0b8398bfd9ed60ecb01c777c6= 1a5e6841d7dec --- /dev/null +++ b/drivers/net/ovpn/bind.h @@ -0,0 +1,101 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* OpenVPN data channel offload + * + * Copyright (C) 2012-2025 OpenVPN, Inc. + * + * Author: James Yonan + * Antonio Quartulli + */ + +#ifndef _NET_OVPN_OVPNBIND_H_ +#define _NET_OVPN_OVPNBIND_H_ + +#include +#include +#include +#include +#include +#include + +struct ovpn_peer; + +/** + * union ovpn_sockaddr - basic transport layer address + * @in4: IPv4 address + * @in6: IPv6 address + */ +union ovpn_sockaddr { + struct sockaddr_in in4; + struct sockaddr_in6 in6; +}; + +/** + * struct ovpn_bind - remote peer binding + * @remote: the remote peer sockaddress + * @local: local endpoint used to talk to the peer + * @local.ipv4: local IPv4 used to talk to the peer + * @local.ipv6: local IPv6 used to talk to the peer + * @rcu: used to schedule RCU cleanup job + */ +struct ovpn_bind { + union ovpn_sockaddr remote; /* remote sockaddr */ + + union { + struct in_addr ipv4; + struct in6_addr ipv6; + } local; + + struct rcu_head rcu; +}; + +/** + * ovpn_bind_skb_src_match - match packet source with binding + * @bind: the binding to match + * @skb: the packet to match + * + * Return: true if the packet source matches the remote peer sockaddr + * in the binding + */ +static inline bool ovpn_bind_skb_src_match(const struct ovpn_bind *bind, + const struct sk_buff *skb) +{ + const union ovpn_sockaddr *remote; + + if (unlikely(!bind)) + return false; + + remote =3D &bind->remote; + + switch (skb->protocol) { + case htons(ETH_P_IP): + if (unlikely(remote->in4.sin_family !=3D AF_INET)) + return false; + + if (unlikely(remote->in4.sin_addr.s_addr !=3D ip_hdr(skb)->saddr)) + return false; + + if (unlikely(remote->in4.sin_port !=3D udp_hdr(skb)->source)) + return false; + break; + case htons(ETH_P_IPV6): + if (unlikely(remote->in6.sin6_family !=3D AF_INET6)) + return false; + + if (unlikely(!ipv6_addr_equal(&remote->in6.sin6_addr, + &ipv6_hdr(skb)->saddr))) + return false; + + if (unlikely(remote->in6.sin6_port !=3D udp_hdr(skb)->source)) + return false; + break; + default: + return false; + } + + return true; +} + +struct ovpn_bind *ovpn_bind_from_sockaddr(const struct sockaddr_storage *s= a); +void ovpn_bind_reset(struct ovpn_peer *peer, struct ovpn_bind *bind); + +#endif /* _NET_OVPN_OVPNBIND_H_ */ diff --git a/drivers/net/ovpn/main.c b/drivers/net/ovpn/main.c index fa1dd84be24060d6dc749dc9e097f166a7adea26..3c2b6a7df27266dcaacc1ea4f8d= 86c686d3105aa 100644 --- a/drivers/net/ovpn/main.c +++ b/drivers/net/ovpn/main.c @@ -19,6 +19,7 @@ #include "main.h" #include "netlink.h" #include "io.h" +#include "peer.h" #include "proto.h" =20 static const struct net_device_ops ovpn_netdev_ops =3D { @@ -92,6 +93,7 @@ static int ovpn_newlink(struct net_device *dev, =20 ovpn->dev =3D dev; ovpn->mode =3D mode; + spin_lock_init(&ovpn->lock); =20 /* Set carrier explicitly after registration, this way state is * clearly defined. @@ -109,6 +111,16 @@ static int ovpn_newlink(struct net_device *dev, return register_netdevice(dev); } =20 +static void ovpn_dellink(struct net_device *dev, struct list_head *head) +{ + struct ovpn_priv *ovpn =3D netdev_priv(dev); + + if (ovpn->mode =3D=3D OVPN_MODE_P2P) + ovpn_peer_release_p2p(ovpn, OVPN_DEL_PEER_REASON_TEARDOWN); + + unregister_netdevice_queue(dev, head); +} + static int ovpn_fill_info(struct sk_buff *skb, const struct net_device *de= v) { struct ovpn_priv *ovpn =3D netdev_priv(dev); @@ -127,7 +139,7 @@ static struct rtnl_link_ops ovpn_link_ops =3D { .policy =3D ovpn_policy, .maxtype =3D IFLA_OVPN_MAX, .newlink =3D ovpn_newlink, - .dellink =3D unregister_netdevice_queue, + .dellink =3D ovpn_dellink, .fill_info =3D ovpn_fill_info, }; =20 diff --git a/drivers/net/ovpn/ovpnpriv.h b/drivers/net/ovpn/ovpnpriv.h index b6b644668d46604ad0f21d59cf479386f4ec1e3e..a398f9da2e0958b0be885a50a13= d80b8b5a515eb 100644 --- a/drivers/net/ovpn/ovpnpriv.h +++ b/drivers/net/ovpn/ovpnpriv.h @@ -17,10 +17,14 @@ * struct ovpn_priv - per ovpn interface state * @dev: the actual netdev representing the tunnel * @mode: device operation mode (i.e. p2p, mp, ..) + * @lock: protect this object + * @peer: in P2P mode, this is the only remote peer */ struct ovpn_priv { struct net_device *dev; enum ovpn_mode mode; + spinlock_t lock; /* protect writing to the ovpn_priv object */ + struct ovpn_peer __rcu *peer; }; =20 #endif /* _NET_OVPN_OVPNSTRUCT_H_ */ diff --git a/drivers/net/ovpn/peer.c b/drivers/net/ovpn/peer.c new file mode 100644 index 0000000000000000000000000000000000000000..338069c99248f42b0c4aeb44b2b= 9d3a35f8bebeb --- /dev/null +++ b/drivers/net/ovpn/peer.c @@ -0,0 +1,411 @@ +// SPDX-License-Identifier: GPL-2.0 +/* OpenVPN data channel offload + * + * Copyright (C) 2020-2025 OpenVPN, Inc. + * + * Author: James Yonan + * Antonio Quartulli + */ + +#include +#include + +#include "ovpnpriv.h" +#include "bind.h" +#include "io.h" +#include "main.h" +#include "netlink.h" +#include "peer.h" + +static void unlock_ovpn(struct ovpn_priv *ovpn, + struct llist_head *release_list) + __releases(&ovpn->lock) +{ + struct ovpn_peer *peer; + + spin_unlock_bh(&ovpn->lock); + + llist_for_each_entry(peer, release_list->first, release_entry) + ovpn_peer_put(peer); +} + +/** + * ovpn_peer_new - allocate and initialize a new peer object + * @ovpn: the openvpn instance inside which the peer should be created + * @id: the ID assigned to this peer + * + * Return: a pointer to the new peer on success or an error code otherwise + */ +struct ovpn_peer *ovpn_peer_new(struct ovpn_priv *ovpn, u32 id) +{ + struct ovpn_peer *peer; + int ret; + + /* alloc and init peer object */ + peer =3D kzalloc(sizeof(*peer), GFP_KERNEL); + if (!peer) + return ERR_PTR(-ENOMEM); + + peer->id =3D id; + peer->ovpn =3D ovpn; + + peer->vpn_addrs.ipv4.s_addr =3D htonl(INADDR_ANY); + peer->vpn_addrs.ipv6 =3D in6addr_any; + + RCU_INIT_POINTER(peer->bind, NULL); + spin_lock_init(&peer->lock); + kref_init(&peer->refcount); + + ret =3D dst_cache_init(&peer->dst_cache, GFP_KERNEL); + if (ret < 0) { + netdev_err(ovpn->dev, + "cannot initialize dst cache for peer %u\n", + peer->id); + kfree(peer); + return ERR_PTR(ret); + } + + netdev_hold(ovpn->dev, &peer->dev_tracker, GFP_KERNEL); + + return peer; +} + +/** + * ovpn_peer_release_rcu - RCU callback performing last peer release steps + * @head: RCU member of the ovpn_peer + */ +static void ovpn_peer_release_rcu(struct rcu_head *head) +{ + struct ovpn_peer *peer =3D container_of(head, struct ovpn_peer, rcu); + + /* this call will immediately free the dst_cache, therefore we + * perform it in the RCU callback, when all contexts are done + */ + dst_cache_destroy(&peer->dst_cache); + kfree(peer); +} + +/** + * ovpn_peer_release - release peer private members + * @peer: the peer to release + */ +static void ovpn_peer_release(struct ovpn_peer *peer) +{ + ovpn_bind_reset(peer, NULL); + call_rcu(&peer->rcu, ovpn_peer_release_rcu); + netdev_put(peer->ovpn->dev, &peer->dev_tracker); +} + +/** + * ovpn_peer_release_kref - callback for kref_put + * @kref: the kref object belonging to the peer + */ +void ovpn_peer_release_kref(struct kref *kref) +{ + struct ovpn_peer *peer =3D container_of(kref, struct ovpn_peer, refcount); + + ovpn_peer_release(peer); +} + +/** + * ovpn_peer_skb_to_sockaddr - fill sockaddr with skb source address + * @skb: the packet to extract data from + * @ss: the sockaddr to fill + * + * Return: sockaddr length on success or -1 otherwise + */ +static int ovpn_peer_skb_to_sockaddr(struct sk_buff *skb, + struct sockaddr_storage *ss) +{ + struct sockaddr_in6 *sa6; + struct sockaddr_in *sa4; + + switch (skb->protocol) { + case htons(ETH_P_IP): + sa4 =3D (struct sockaddr_in *)ss; + sa4->sin_family =3D AF_INET; + sa4->sin_addr.s_addr =3D ip_hdr(skb)->saddr; + sa4->sin_port =3D udp_hdr(skb)->source; + return sizeof(*sa4); + case htons(ETH_P_IPV6): + sa6 =3D (struct sockaddr_in6 *)ss; + sa6->sin6_family =3D AF_INET6; + sa6->sin6_addr =3D ipv6_hdr(skb)->saddr; + sa6->sin6_port =3D udp_hdr(skb)->source; + return sizeof(*sa6); + } + + return -1; +} + +/** + * ovpn_peer_transp_match - check if sockaddr and peer binding match + * @peer: the peer to get the binding from + * @ss: the sockaddr to match + * + * Return: true if sockaddr and binding match or false otherwise + */ +static bool ovpn_peer_transp_match(const struct ovpn_peer *peer, + const struct sockaddr_storage *ss) +{ + struct ovpn_bind *bind =3D rcu_dereference(peer->bind); + struct sockaddr_in6 *sa6; + struct sockaddr_in *sa4; + + if (unlikely(!bind)) + return false; + + if (ss->ss_family !=3D bind->remote.in4.sin_family) + return false; + + switch (ss->ss_family) { + case AF_INET: + sa4 =3D (struct sockaddr_in *)ss; + if (sa4->sin_addr.s_addr !=3D bind->remote.in4.sin_addr.s_addr) + return false; + if (sa4->sin_port !=3D bind->remote.in4.sin_port) + return false; + break; + case AF_INET6: + sa6 =3D (struct sockaddr_in6 *)ss; + if (!ipv6_addr_equal(&sa6->sin6_addr, + &bind->remote.in6.sin6_addr)) + return false; + if (sa6->sin6_port !=3D bind->remote.in6.sin6_port) + return false; + break; + default: + return false; + } + + return true; +} + +/** + * ovpn_peer_get_by_transp_addr_p2p - get peer by transport address in a P= 2P + * instance + * @ovpn: the openvpn instance to search + * @ss: the transport socket address + * + * Return: the peer if found or NULL otherwise + */ +static struct ovpn_peer * +ovpn_peer_get_by_transp_addr_p2p(struct ovpn_priv *ovpn, + struct sockaddr_storage *ss) +{ + struct ovpn_peer *tmp, *peer =3D NULL; + + rcu_read_lock(); + tmp =3D rcu_dereference(ovpn->peer); + if (likely(tmp && ovpn_peer_transp_match(tmp, ss) && + ovpn_peer_hold(tmp))) + peer =3D tmp; + rcu_read_unlock(); + + return peer; +} + +/** + * ovpn_peer_get_by_transp_addr - retrieve peer by transport address + * @ovpn: the openvpn instance to search + * @skb: the skb to retrieve the source transport address from + * + * Return: a pointer to the peer if found or NULL otherwise + */ +struct ovpn_peer *ovpn_peer_get_by_transp_addr(struct ovpn_priv *ovpn, + struct sk_buff *skb) +{ + struct ovpn_peer *peer =3D NULL; + struct sockaddr_storage ss =3D { 0 }; + + if (unlikely(!ovpn_peer_skb_to_sockaddr(skb, &ss))) + return NULL; + + if (ovpn->mode =3D=3D OVPN_MODE_P2P) + peer =3D ovpn_peer_get_by_transp_addr_p2p(ovpn, &ss); + + return peer; +} + +/** + * ovpn_peer_get_by_id_p2p - get peer by ID in a P2P instance + * @ovpn: the openvpn instance to search + * @peer_id: the ID of the peer to find + * + * Return: the peer if found or NULL otherwise + */ +static struct ovpn_peer *ovpn_peer_get_by_id_p2p(struct ovpn_priv *ovpn, + u32 peer_id) +{ + struct ovpn_peer *tmp, *peer =3D NULL; + + rcu_read_lock(); + tmp =3D rcu_dereference(ovpn->peer); + if (likely(tmp && tmp->id =3D=3D peer_id && ovpn_peer_hold(tmp))) + peer =3D tmp; + rcu_read_unlock(); + + return peer; +} + +/** + * ovpn_peer_get_by_id - retrieve peer by ID + * @ovpn: the openvpn instance to search + * @peer_id: the unique peer identifier to match + * + * Return: a pointer to the peer if found or NULL otherwise + */ +struct ovpn_peer *ovpn_peer_get_by_id(struct ovpn_priv *ovpn, u32 peer_id) +{ + struct ovpn_peer *peer =3D NULL; + + if (ovpn->mode =3D=3D OVPN_MODE_P2P) + peer =3D ovpn_peer_get_by_id_p2p(ovpn, peer_id); + + return peer; +} + +static void ovpn_peer_remove(struct ovpn_peer *peer, + enum ovpn_del_peer_reason reason, + struct llist_head *release_list) +{ + switch (peer->ovpn->mode) { + case OVPN_MODE_P2P: + /* prevent double remove */ + if (peer !=3D rcu_access_pointer(peer->ovpn->peer)) + return; + + RCU_INIT_POINTER(peer->ovpn->peer, NULL); + /* in P2P mode the carrier is switched off when the peer is + * deleted so that third party protocols can react accordingly + */ + netif_carrier_off(peer->ovpn->dev); + break; + default: + return; + } + + peer->delete_reason =3D reason; + + /* append to provided list for later socket release and ref drop */ + llist_add(&peer->release_entry, release_list); +} + +/** + * ovpn_peer_add_p2p - add peer to related tables in a P2P instance + * @ovpn: the instance to add the peer to + * @peer: the peer to add + * + * Return: 0 on success or a negative error code otherwise + */ +static int ovpn_peer_add_p2p(struct ovpn_priv *ovpn, struct ovpn_peer *pee= r) +{ + LLIST_HEAD(release_list); + struct ovpn_peer *tmp; + + spin_lock_bh(&ovpn->lock); + /* in p2p mode it is possible to have a single peer only, therefore the + * old one is released and substituted by the new one + */ + tmp =3D rcu_dereference_protected(ovpn->peer, + lockdep_is_held(&ovpn->lock)); + if (tmp) + ovpn_peer_remove(tmp, OVPN_DEL_PEER_REASON_TEARDOWN, + &release_list); + + rcu_assign_pointer(ovpn->peer, peer); + /* in P2P mode the carrier is switched on when the peer is added */ + netif_carrier_on(ovpn->dev); + unlock_ovpn(ovpn, &release_list); + + return 0; +} + +/** + * ovpn_peer_add - add peer to the related tables + * @ovpn: the openvpn instance the peer belongs to + * @peer: the peer object to add + * + * Assume refcounter was increased by caller + * + * Return: 0 on success or a negative error code otherwise + */ +int ovpn_peer_add(struct ovpn_priv *ovpn, struct ovpn_peer *peer) +{ + switch (ovpn->mode) { + case OVPN_MODE_P2P: + return ovpn_peer_add_p2p(ovpn, peer); + default: + return -EOPNOTSUPP; + } +} + +/** + * ovpn_peer_del_p2p - delete peer from related tables in a P2P instance + * @peer: the peer to delete + * @reason: reason why the peer was deleted (sent to userspace) + * @release_list: list where delete peer should be appended + * + * Return: 0 on success or a negative error code otherwise + */ +static int ovpn_peer_del_p2p(struct ovpn_peer *peer, + enum ovpn_del_peer_reason reason, + struct llist_head *release_list) +{ + struct ovpn_peer *tmp; + + lockdep_assert_held(&peer->ovpn->lock); + + tmp =3D rcu_dereference_protected(peer->ovpn->peer, + lockdep_is_held(&peer->ovpn->lock)); + if (tmp !=3D peer) + return -ENOENT; + + ovpn_peer_remove(peer, reason, release_list); + + return 0; +} + +/** + * ovpn_peer_del - delete peer from related tables + * @peer: the peer object to delete + * @reason: reason for deleting peer (will be sent to userspace) + * + * Return: 0 on success or a negative error code otherwise + */ +int ovpn_peer_del(struct ovpn_peer *peer, enum ovpn_del_peer_reason reason) +{ + LLIST_HEAD(release_list); + int ret =3D -EOPNOTSUPP; + + spin_lock_bh(&peer->ovpn->lock); + switch (peer->ovpn->mode) { + case OVPN_MODE_P2P: + ret =3D ovpn_peer_del_p2p(peer, reason, &release_list); + break; + default: + break; + } + unlock_ovpn(peer->ovpn, &release_list); + + return ret; +} + +/** + * ovpn_peer_release_p2p - release peer upon P2P device teardown + * @ovpn: the instance being torn down + * @reason: the reason for releasing the peer + */ +void ovpn_peer_release_p2p(struct ovpn_priv *ovpn, + enum ovpn_del_peer_reason reason) +{ + LLIST_HEAD(release_list); + struct ovpn_peer *peer; + + spin_lock_bh(&ovpn->lock); + peer =3D rcu_dereference_protected(ovpn->peer, + lockdep_is_held(&ovpn->lock)); + if (peer) + ovpn_peer_remove(peer, reason, &release_list); + unlock_ovpn(ovpn, &release_list); +} diff --git a/drivers/net/ovpn/peer.h b/drivers/net/ovpn/peer.h new file mode 100644 index 0000000000000000000000000000000000000000..fd2e7625990a73f61bf5bb4c051= 929828d9996bd --- /dev/null +++ b/drivers/net/ovpn/peer.h @@ -0,0 +1,80 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* OpenVPN data channel offload + * + * Copyright (C) 2020-2025 OpenVPN, Inc. + * + * Author: James Yonan + * Antonio Quartulli + */ + +#ifndef _NET_OVPN_OVPNPEER_H_ +#define _NET_OVPN_OVPNPEER_H_ + +#include + +/** + * struct ovpn_peer - the main remote peer object + * @ovpn: main openvpn instance this peer belongs to + * @dev_tracker: reference tracker for associated dev + * @id: unique identifier + * @vpn_addrs: IP addresses assigned over the tunnel + * @vpn_addrs.ipv4: IPv4 assigned to peer on the tunnel + * @vpn_addrs.ipv6: IPv6 assigned to peer on the tunnel + * @dst_cache: cache for dst_entry used to send to peer + * @bind: remote peer binding + * @delete_reason: why peer was deleted (i.e. timeout, transport error, ..) + * @lock: protects binding to peer (bind) + * @refcount: reference counter + * @rcu: used to free peer in an RCU safe way + * @release_entry: entry for the socket release list + */ +struct ovpn_peer { + struct ovpn_priv *ovpn; + netdevice_tracker dev_tracker; + u32 id; + struct { + struct in_addr ipv4; + struct in6_addr ipv6; + } vpn_addrs; + struct dst_cache dst_cache; + struct ovpn_bind __rcu *bind; + enum ovpn_del_peer_reason delete_reason; + spinlock_t lock; /* protects bind */ + struct kref refcount; + struct rcu_head rcu; + struct llist_node release_entry; +}; + +/** + * ovpn_peer_hold - increase reference counter + * @peer: the peer whose counter should be increased + * + * Return: true if the counter was increased or false if it was zero alrea= dy + */ +static inline bool ovpn_peer_hold(struct ovpn_peer *peer) +{ + return kref_get_unless_zero(&peer->refcount); +} + +void ovpn_peer_release_kref(struct kref *kref); + +/** + * ovpn_peer_put - decrease reference counter + * @peer: the peer whose counter should be decreased + */ +static inline void ovpn_peer_put(struct ovpn_peer *peer) +{ + kref_put(&peer->refcount, ovpn_peer_release_kref); +} + +struct ovpn_peer *ovpn_peer_new(struct ovpn_priv *ovpn, u32 id); +int ovpn_peer_add(struct ovpn_priv *ovpn, struct ovpn_peer *peer); +int ovpn_peer_del(struct ovpn_peer *peer, enum ovpn_del_peer_reason reason= ); +void ovpn_peer_release_p2p(struct ovpn_priv *ovpn, + enum ovpn_del_peer_reason reason); + +struct ovpn_peer *ovpn_peer_get_by_transp_addr(struct ovpn_priv *ovpn, + struct sk_buff *skb); +struct ovpn_peer *ovpn_peer_get_by_id(struct ovpn_priv *ovpn, u32 peer_id); + +#endif /* _NET_OVPN_OVPNPEER_H_ */ --=20 2.49.0