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charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20241025-b4-ovpn-v10-4-b87530777be7@openvpn.net> References: <20241025-b4-ovpn-v10-0-b87530777be7@openvpn.net> In-Reply-To: <20241025-b4-ovpn-v10-0-b87530777be7@openvpn.net> To: Eric Dumazet , Jakub Kicinski , Paolo Abeni , Donald Hunter , Antonio Quartulli , Shuah Khan , donald.hunter@gmail.com, sd@queasysnail.net, ryazanov.s.a@gmail.com, Andrew Lunn Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=8751; i=antonio@openvpn.net; h=from:subject:message-id; bh=NHB8DY+derJjmpIyfM7tZseTb7zJiJA5OcsJ97CZXUw=; b=owEBbQGS/pANAwAIAQtw5TqgONWHAcsmYgBnG2GYGEzAUjR6mDIcvWuYGZbfm8ATX6IaFMjdy UpjjWUniFWJATMEAAEIAB0WIQSZq9xs+NQS5N5fwPwLcOU6oDjVhwUCZxthmAAKCRALcOU6oDjV h6BeCACDQv15QbzlXRSejuLys6ioWgs+qzms29dkyfEYtVmpq4JL61M120/KkNI52tMnkizzTq9 R2Rj9ptIHL8xgrxNldCUiOuyUIkN0zHhUxapfgYLvD6zyHGNdGrv64P3XbKPXsqwL2H054uEduz JiNDahgxRG8mus75qiSrHJV6/v9xycqJUc/Q29JgxvFI2VpL48RWi039nPzIs+0hsiDV3knWgSR ZbxKsTKKS3Y/HN3Cn16u6ynqaxKP4qkE2qxvC5bZOD2q7TiOtO4C3IvnjQD0Z1hzz57rY+vPnsr s+r7IVLESEfvE5hEdvh87YMywA1ZIsnhr8eLARrv80Z01aH1 X-Developer-Key: i=antonio@openvpn.net; a=openpgp; fpr=CABDA1282017C267219885C748F0CCB68F59D14C Add basic infrastructure for handling ovpn interfaces. Signed-off-by: Antonio Quartulli --- drivers/net/ovpn/main.c | 115 ++++++++++++++++++++++++++++++++++++++= ++-- drivers/net/ovpn/main.h | 7 +++ drivers/net/ovpn/ovpnstruct.h | 8 +++ drivers/net/ovpn/packet.h | 40 +++++++++++++++ include/uapi/linux/if_link.h | 15 ++++++ 5 files changed, 180 insertions(+), 5 deletions(-) diff --git a/drivers/net/ovpn/main.c b/drivers/net/ovpn/main.c index d5bdb0055f4dd3a6e32dc6e792bed1e7fd59e101..eead7677b8239eb3c48bb26ca95= 492d88512b8d4 100644 --- a/drivers/net/ovpn/main.c +++ b/drivers/net/ovpn/main.c @@ -10,18 +10,52 @@ #include #include #include +#include +#include #include -#include +#include =20 #include "ovpnstruct.h" #include "main.h" #include "netlink.h" #include "io.h" +#include "packet.h" =20 /* Driver info */ #define DRV_DESCRIPTION "OpenVPN data channel offload (ovpn)" #define DRV_COPYRIGHT "(C) 2020-2024 OpenVPN, Inc." =20 +static void ovpn_struct_free(struct net_device *net) +{ +} + +static int ovpn_net_open(struct net_device *dev) +{ + netif_tx_start_all_queues(dev); + return 0; +} + +static int ovpn_net_stop(struct net_device *dev) +{ + netif_tx_stop_all_queues(dev); + return 0; +} + +static const struct net_device_ops ovpn_netdev_ops =3D { + .ndo_open =3D ovpn_net_open, + .ndo_stop =3D ovpn_net_stop, + .ndo_start_xmit =3D ovpn_net_xmit, +}; + +static const struct device_type ovpn_type =3D { + .name =3D OVPN_FAMILY_NAME, +}; + +static const struct nla_policy ovpn_policy[IFLA_OVPN_MAX + 1] =3D { + [IFLA_OVPN_MODE] =3D NLA_POLICY_RANGE(NLA_U8, OVPN_MODE_P2P, + OVPN_MODE_MP), +}; + /** * ovpn_dev_is_valid - check if the netdevice is of type 'ovpn' * @dev: the interface to check @@ -33,16 +67,76 @@ bool ovpn_dev_is_valid(const struct net_device *dev) return dev->netdev_ops->ndo_start_xmit =3D=3D ovpn_net_xmit; } =20 +static void ovpn_setup(struct net_device *dev) +{ + /* compute the overhead considering AEAD encryption */ + const int overhead =3D sizeof(u32) + NONCE_WIRE_SIZE + 16 + + sizeof(struct udphdr) + + max(sizeof(struct ipv6hdr), sizeof(struct iphdr)); + + netdev_features_t feat =3D NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM | + NETIF_F_GSO | NETIF_F_GSO_SOFTWARE | + NETIF_F_HIGHDMA; + + dev->needs_free_netdev =3D true; + + dev->pcpu_stat_type =3D NETDEV_PCPU_STAT_TSTATS; + + dev->netdev_ops =3D &ovpn_netdev_ops; + + dev->priv_destructor =3D ovpn_struct_free; + + dev->hard_header_len =3D 0; + dev->addr_len =3D 0; + dev->mtu =3D ETH_DATA_LEN - overhead; + dev->min_mtu =3D IPV4_MIN_MTU; + dev->max_mtu =3D IP_MAX_MTU - overhead; + + dev->type =3D ARPHRD_NONE; + dev->flags =3D IFF_POINTOPOINT | IFF_NOARP; + dev->priv_flags |=3D IFF_NO_QUEUE; + + dev->lltx =3D true; + dev->features |=3D feat; + dev->hw_features |=3D feat; + dev->hw_enc_features |=3D feat; + + dev->needed_headroom =3D OVPN_HEAD_ROOM; + dev->needed_tailroom =3D OVPN_MAX_PADDING; + + SET_NETDEV_DEVTYPE(dev, &ovpn_type); +} + static int ovpn_newlink(struct net *src_net, struct net_device *dev, struct nlattr *tb[], struct nlattr *data[], struct netlink_ext_ack *extack) { - return -EOPNOTSUPP; + struct ovpn_struct *ovpn =3D netdev_priv(dev); + enum ovpn_mode mode =3D OVPN_MODE_P2P; + + if (data && data[IFLA_OVPN_MODE]) { + mode =3D nla_get_u8(data[IFLA_OVPN_MODE]); + netdev_dbg(dev, "setting device mode: %u\n", mode); + } + + ovpn->dev =3D dev; + ovpn->mode =3D mode; + + /* turn carrier explicitly off after registration, this way state is + * clearly defined + */ + netif_carrier_off(dev); + + return register_netdevice(dev); } =20 static struct rtnl_link_ops ovpn_link_ops =3D { .kind =3D OVPN_FAMILY_NAME, .netns_refund =3D false, + .priv_size =3D sizeof(struct ovpn_struct), + .setup =3D ovpn_setup, + .policy =3D ovpn_policy, + .maxtype =3D IFLA_OVPN_MAX, .newlink =3D ovpn_newlink, .dellink =3D unregister_netdevice_queue, }; @@ -51,26 +145,37 @@ static int ovpn_netdev_notifier_call(struct notifier_b= lock *nb, unsigned long state, void *ptr) { struct net_device *dev =3D netdev_notifier_info_to_dev(ptr); + struct ovpn_struct *ovpn; =20 if (!ovpn_dev_is_valid(dev)) return NOTIFY_DONE; =20 + ovpn =3D netdev_priv(dev); + switch (state) { case NETDEV_REGISTER: - /* add device to internal list for later destruction upon - * unregistration - */ + ovpn->registered =3D true; break; case NETDEV_UNREGISTER: + /* twiddle thumbs on netns device moves */ + if (dev->reg_state !=3D NETREG_UNREGISTERING) + break; + /* can be delivered multiple times, so check registered flag, * then destroy the interface */ + if (!ovpn->registered) + return NOTIFY_DONE; + + netif_carrier_off(dev); + ovpn->registered =3D false; break; case NETDEV_POST_INIT: case NETDEV_GOING_DOWN: case NETDEV_DOWN: case NETDEV_UP: case NETDEV_PRE_UP: + break; default: return NOTIFY_DONE; } diff --git a/drivers/net/ovpn/main.h b/drivers/net/ovpn/main.h index a3215316c49bfcdf2496590bac878f145b8b27fd..0740a05070a817e0daea7b63a1f= 4fcebd274eb37 100644 --- a/drivers/net/ovpn/main.h +++ b/drivers/net/ovpn/main.h @@ -12,4 +12,11 @@ =20 bool ovpn_dev_is_valid(const struct net_device *dev); =20 +#define SKB_HEADER_LEN \ + (max(sizeof(struct iphdr), sizeof(struct ipv6hdr)) + \ + sizeof(struct udphdr) + NET_SKB_PAD) + +#define OVPN_HEAD_ROOM ALIGN(16 + SKB_HEADER_LEN, 4) +#define OVPN_MAX_PADDING 16 + #endif /* _NET_OVPN_MAIN_H_ */ diff --git a/drivers/net/ovpn/ovpnstruct.h b/drivers/net/ovpn/ovpnstruct.h index e3e4df6418b081436378fc51d98db5bd7b5d1fbe..211df871538d34fdff90d182f21= a0b0fb11b28ad 100644 --- a/drivers/net/ovpn/ovpnstruct.h +++ b/drivers/net/ovpn/ovpnstruct.h @@ -11,15 +11,23 @@ #define _NET_OVPN_OVPNSTRUCT_H_ =20 #include +#include +#include =20 /** * struct ovpn_struct - per ovpn interface state * @dev: the actual netdev representing the tunnel * @dev_tracker: reference tracker for associated dev + * @registered: whether dev is still registered with netdev or not + * @mode: device operation mode (i.e. p2p, mp, ..) + * @dev_list: entry for the module wide device list */ struct ovpn_struct { struct net_device *dev; netdevice_tracker dev_tracker; + bool registered; + enum ovpn_mode mode; + struct list_head dev_list; }; =20 #endif /* _NET_OVPN_OVPNSTRUCT_H_ */ diff --git a/drivers/net/ovpn/packet.h b/drivers/net/ovpn/packet.h new file mode 100644 index 0000000000000000000000000000000000000000..7ed146f5932a25f448af6da5873= 8a7eae81007fe --- /dev/null +++ b/drivers/net/ovpn/packet.h @@ -0,0 +1,40 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* OpenVPN data channel offload + * + * Copyright (C) 2020-2024 OpenVPN, Inc. + * + * Author: Antonio Quartulli + * James Yonan + */ + +#ifndef _NET_OVPN_PACKET_H_ +#define _NET_OVPN_PACKET_H_ + +/* When the OpenVPN protocol is ran in AEAD mode, use + * the OpenVPN packet ID as the AEAD nonce: + * + * 00000005 521c3b01 4308c041 + * [seq # ] [ nonce_tail ] + * [ 12-byte full IV ] -> NONCE_SIZE + * [4-bytes -> NONCE_WIRE_SIZE + * on wire] + */ + +/* OpenVPN nonce size */ +#define NONCE_SIZE 12 + +/* OpenVPN nonce size reduced by 8-byte nonce tail -- this is the + * size of the AEAD Associated Data (AD) sent over the wire + * and is normally the head of the IV + */ +#define NONCE_WIRE_SIZE (NONCE_SIZE - sizeof(struct ovpn_nonce_tail)) + +/* Last 8 bytes of AEAD nonce + * Provided by userspace and usually derived from + * key material generated during TLS handshake + */ +struct ovpn_nonce_tail { + u8 u8[OVPN_NONCE_TAIL_SIZE]; +}; + +#endif /* _NET_OVPN_PACKET_H_ */ diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h index 8516c1ccd57a7c7634a538fe3ac16c858f647420..84d294aab20b79b8e9cb9b736a0= 74105c99338f3 100644 --- a/include/uapi/linux/if_link.h +++ b/include/uapi/linux/if_link.h @@ -1975,4 +1975,19 @@ enum { =20 #define IFLA_DSA_MAX (__IFLA_DSA_MAX - 1) =20 +/* OVPN section */ + +enum ovpn_mode { + OVPN_MODE_P2P, + OVPN_MODE_MP, +}; + +enum { + IFLA_OVPN_UNSPEC, + IFLA_OVPN_MODE, + __IFLA_OVPN_MAX, +}; + +#define IFLA_OVPN_MAX (__IFLA_OVPN_MAX - 1) + #endif /* _UAPI_LINUX_IF_LINK_H */ --=20 2.45.2