[PATCH net-next v8 03/24] ovpn: add basic netlink support
From: Antonio Quartulli
Date: Wed Oct 02 2024 - 05:04:39 EST
This commit introduces basic netlink support with family
registration/unregistration functionalities and stub pre/post-doit.
More importantly it introduces the YAML uAPI description along
with its auto-generated files:
- include/uapi/linux/ovpn.h
- drivers/net/ovpn/netlink-gen.c
- drivers/net/ovpn/netlink-gen.h
Cc: donald.hunter@xxxxxxxxx
Signed-off-by: Antonio Quartulli <antonio@xxxxxxxxxxx>
---
Documentation/netlink/specs/ovpn.yaml | 387 ++++++++++++++++++++++++++++++++++
MAINTAINERS | 2 +
drivers/net/ovpn/Makefile | 2 +
drivers/net/ovpn/main.c | 15 +-
drivers/net/ovpn/netlink-gen.c | 224 ++++++++++++++++++++
drivers/net/ovpn/netlink-gen.h | 42 ++++
drivers/net/ovpn/netlink.c | 158 ++++++++++++++
drivers/net/ovpn/netlink.h | 15 ++
drivers/net/ovpn/ovpnstruct.h | 21 ++
include/uapi/linux/ovpn.h | 116 ++++++++++
10 files changed, 981 insertions(+), 1 deletion(-)
diff --git a/Documentation/netlink/specs/ovpn.yaml b/Documentation/netlink/specs/ovpn.yaml
new file mode 100644
index 0000000000000000000000000000000000000000..36983f293ecbd59532114808a20737005e91ad72
--- /dev/null
+++ b/Documentation/netlink/specs/ovpn.yaml
@@ -0,0 +1,387 @@
+# SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause)
+#
+# Author: Antonio Quartulli <antonio@xxxxxxxxxxx>
+#
+# Copyright (c) 2024, OpenVPN Inc.
+#
+
+name: ovpn
+
+protocol: genetlink
+
+doc: Netlink protocol to control OpenVPN network devices
+
+definitions:
+ -
+ type: const
+ name: nonce-tail-size
+ value: 8
+ -
+ type: enum
+ name: cipher-alg
+ value-start: 0
+ entries: [ none, aes-gcm, chacha20-poly1305 ]
+ -
+ type: enum
+ name: del-peer-reason
+ value-start: 0
+ entries: [ teardown, userspace, expired, transport-error, transport-disconnect ]
+ -
+ type: enum
+ name: key-slot
+ value-start: 0
+ entries: [ primary, secondary ]
+ -
+ type: enum
+ name: mode
+ value-start: 0
+ entries: [ p2p, mp ]
+
+attribute-sets:
+ -
+ name: peer
+ attributes:
+ -
+ name: id
+ type: u32
+ doc: |
+ The unique ID of the peer. To be used to identify peers during
+ operations
+ checks:
+ max: 0xFFFFFF
+ -
+ name: remote-ipv4
+ type: u32
+ doc: The remote IPv4 address of the peer
+ byte-order: big-endian
+ display-hint: ipv4
+ -
+ name: remote-ipv6
+ type: binary
+ doc: The remote IPv6 address of the peer
+ display-hint: ipv6
+ checks:
+ exact-len: 16
+ -
+ name: remote-ipv6-scope-id
+ type: u32
+ doc: The scope id of the remote IPv6 address of the peer (RFC2553)
+ -
+ name: remote-port
+ type: u16
+ doc: The remote port of the peer
+ byte-order: big-endian
+ checks:
+ min: 1
+ -
+ name: socket
+ type: u32
+ doc: The socket to be used to communicate with the peer
+ -
+ name: vpn-ipv4
+ type: u32
+ doc: The IPv4 address assigned to the peer by the server
+ byte-order: big-endian
+ display-hint: ipv4
+ -
+ name: vpn-ipv6
+ type: binary
+ doc: The IPv6 address assigned to the peer by the server
+ display-hint: ipv6
+ checks:
+ exact-len: 16
+ -
+ name: local-ipv4
+ type: u32
+ doc: The local IPv4 to be used to send packets to the peer (UDP only)
+ byte-order: big-endian
+ display-hint: ipv4
+ -
+ name: local-ipv6
+ type: binary
+ doc: The local IPv6 to be used to send packets to the peer (UDP only)
+ display-hint: ipv6
+ checks:
+ exact-len: 16
+ -
+ name: local-port
+ type: u16
+ doc: The local port to be used to send packets to the peer (UDP only)
+ byte-order: big-endian
+ checks:
+ min: 1
+ -
+ name: keepalive-interval
+ type: u32
+ doc: |
+ The number of seconds after which a keep alive message is sent to the
+ peer
+ -
+ name: keepalive-timeout
+ type: u32
+ doc: |
+ The number of seconds from the last activity after which the peer is
+ assumed dead
+ -
+ name: del-reason
+ type: u32
+ doc: The reason why a peer was deleted
+ enum: del-peer-reason
+ -
+ name: vpn-rx-bytes
+ type: uint
+ doc: Number of bytes received over the tunnel
+ -
+ name: vpn-tx-bytes
+ type: uint
+ doc: Number of bytes transmitted over the tunnel
+ -
+ name: vpn-rx-packets
+ type: uint
+ doc: Number of packets received over the tunnel
+ -
+ name: vpn-tx-packets
+ type: uint
+ doc: Number of packets transmitted over the tunnel
+ -
+ name: link-rx-bytes
+ type: uint
+ doc: Number of bytes received at the transport level
+ -
+ name: link-tx-bytes
+ type: uint
+ doc: Number of bytes transmitted at the transport level
+ -
+ name: link-rx-packets
+ type: u32
+ doc: Number of packets received at the transport level
+ -
+ name: link-tx-packets
+ type: u32
+ doc: Number of packets transmitted at the transport level
+ -
+ name: keyconf
+ attributes:
+ -
+ name: peer-id
+ type: u32
+ doc: |
+ The unique ID of the peer. To be used to identify peers during
+ key operations
+ checks:
+ max: 0xFFFFFF
+ -
+ name: slot
+ type: u32
+ doc: The slot where the key should be stored
+ enum: key-slot
+ -
+ name: key-id
+ doc: |
+ The unique ID of the key. Used to fetch the correct key upon
+ decryption
+ type: u32
+ checks:
+ max: 7
+ -
+ name: cipher-alg
+ type: u32
+ doc: The cipher to be used when communicating with the peer
+ enum: cipher-alg
+ -
+ name: encrypt-dir
+ type: nest
+ doc: Key material for encrypt direction
+ nested-attributes: keydir
+ -
+ name: decrypt-dir
+ type: nest
+ doc: Key material for decrypt direction
+ nested-attributes: keydir
+ -
+ name: keydir
+ attributes:
+ -
+ name: cipher-key
+ type: binary
+ doc: The actual key to be used by the cipher
+ checks:
+ max-len: 256
+ -
+ name: nonce-tail
+ type: binary
+ doc: |
+ Random nonce to be concatenated to the packet ID, in order to
+ obtain the actua cipher IV
+ checks:
+ exact-len: nonce-tail-size
+ -
+ name: ovpn
+ attributes:
+ -
+ name: ifindex
+ type: u32
+ doc: Index of the ovpn interface to operate on
+ -
+ name: ifname
+ type: string
+ doc: Name of the ovpn interface that is being created
+ -
+ name: mode
+ type: u32
+ enum: mode
+ doc: |
+ Oper mode instructing an interface to act as Point2Point or
+ MultiPoint
+ -
+ name: peer
+ type: nest
+ doc: |
+ The peer object containing the attributed of interest for the specific
+ operation
+ nested-attributes: peer
+ -
+ name: keyconf
+ type: nest
+ doc: Peer specific cipher configuration
+ nested-attributes: keyconf
+
+operations:
+ list:
+ -
+ name: dev-new
+ attribute-set: ovpn
+ flags: [ admin-perm ]
+ doc: Create a new interface of type ovpn
+ do:
+ request:
+ attributes:
+ - ifname
+ - mode
+ reply:
+ attributes:
+ - ifname
+ - ifindex
+ -
+ name: dev-del
+ attribute-set: ovpn
+ flags: [ admin-perm ]
+ doc: Delete existing interface of type ovpn
+ do:
+ pre: ovpn-nl-pre-doit
+ post: ovpn-nl-post-doit
+ request:
+ attributes:
+ - ifindex
+ -
+ name: peer-new
+ attribute-set: ovpn
+ flags: [ admin-perm ]
+ doc: Add a remote peer
+ do:
+ pre: ovpn-nl-pre-doit
+ post: ovpn-nl-post-doit
+ request:
+ attributes:
+ - ifindex
+ - peer
+ -
+ name: peer-set
+ attribute-set: ovpn
+ flags: [ admin-perm ]
+ doc: modify a remote peer
+ do:
+ pre: ovpn-nl-pre-doit
+ post: ovpn-nl-post-doit
+ request:
+ attributes:
+ - ifindex
+ - peer
+ -
+ name: peer-get
+ attribute-set: ovpn
+ flags: [ admin-perm ]
+ doc: Retrieve data about existing remote peers (or a specific one)
+ do:
+ pre: ovpn-nl-pre-doit
+ post: ovpn-nl-post-doit
+ request:
+ attributes:
+ - ifindex
+ - peer
+ reply:
+ attributes:
+ - peer
+ dump:
+ request:
+ attributes:
+ - ifindex
+ reply:
+ attributes:
+ - peer
+ -
+ name: peer-del
+ attribute-set: ovpn
+ flags: [ admin-perm ]
+ doc: Delete existing remote peer
+ do:
+ pre: ovpn-nl-pre-doit
+ post: ovpn-nl-post-doit
+ request:
+ attributes:
+ - ifindex
+ - peer
+ -
+ name: peer-del-ntf
+ doc: Notification about a peer being deleted
+ notify: peer-get
+ mcgrp: peers
+
+ -
+ name: key-new
+ attribute-set: ovpn
+ flags: [ admin-perm ]
+ doc: Add a cipher key for a specific peer
+ do:
+ pre: ovpn-nl-pre-doit
+ post: ovpn-nl-post-doit
+ request:
+ attributes:
+ - ifindex
+ - keyconf
+ -
+ name: key-swap
+ attribute-set: ovpn
+ flags: [ admin-perm ]
+ doc: Swap primary and secondary session keys for a specific peer
+ do:
+ pre: ovpn-nl-pre-doit
+ post: ovpn-nl-post-doit
+ request:
+ attributes:
+ - ifindex
+ - keyconf
+ -
+ name: key-swap-ntf
+ notify: key-new
+ doc: |
+ Notification about key having exhausted its IV space and requiring
+ renegotiation
+ mcgrp: peers
+ -
+ name: key-del
+ attribute-set: ovpn
+ flags: [ admin-perm ]
+ doc: Delete cipher key for a specific peer
+ do:
+ pre: ovpn-nl-pre-doit
+ post: ovpn-nl-post-doit
+ request:
+ attributes:
+ - ifindex
+ - keyconf
+
+mcast-groups:
+ list:
+ -
+ name: peers
diff --git a/MAINTAINERS b/MAINTAINERS
index 0f02c9e1664fddb5ad45232e46b02c42aa27f1b6..f753060d4e2467a786778ddd4f835861a603ce02 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -17455,6 +17455,8 @@ L: netdev@xxxxxxxxxxxxxxx
S: Maintained
T: git https://github.com/OpenVPN/linux-kernel-ovpn.git
F: drivers/net/ovpn/
+F: include/uapi/linux/ovpn.h
+F: Documentation/netlink/spec/ovpn.yaml
P54 WIRELESS DRIVER
M: Christian Lamparter <chunkeey@xxxxxxxxxxxxxx>
diff --git a/drivers/net/ovpn/Makefile b/drivers/net/ovpn/Makefile
index 53fb197027d787d6683e9056d3d341abf6ed38e4..201dc001419f1d99ae95c0ee0f96e68f8a4eac16 100644
--- a/drivers/net/ovpn/Makefile
+++ b/drivers/net/ovpn/Makefile
@@ -9,3 +9,5 @@
obj-$(CONFIG_OVPN) := ovpn.o
ovpn-y += main.o
ovpn-y += io.o
+ovpn-y += netlink.o
+ovpn-y += netlink-gen.o
diff --git a/drivers/net/ovpn/main.c b/drivers/net/ovpn/main.c
index 2a9a8e11c5111eb36fab1fb47d6c4c6dfdf56a78..0274ddddbcd25080d7f85347f79aad0259771508 100644
--- a/drivers/net/ovpn/main.c
+++ b/drivers/net/ovpn/main.c
@@ -7,12 +7,16 @@
* James Yonan <james@xxxxxxxxxxx>
*/
+#include <linux/genetlink.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/version.h>
#include <net/rtnetlink.h>
+#include <uapi/linux/ovpn.h>
+#include "ovpnstruct.h"
#include "main.h"
+#include "netlink.h"
#include "io.h"
/* Driver info */
@@ -31,7 +35,7 @@ bool ovpn_dev_is_valid(const struct net_device *dev)
}
static struct rtnl_link_ops ovpn_link_ops = {
- .kind = "ovpn",
+ .kind = OVPN_FAMILY_NAME,
.netns_refund = false,
.dellink = unregister_netdevice_queue,
};
@@ -86,8 +90,16 @@ static int __init ovpn_init(void)
goto unreg_netdev;
}
+ err = ovpn_nl_register();
+ if (err) {
+ pr_err("ovpn: can't register netlink family: %d\n", err);
+ goto unreg_rtnl;
+ }
+
return 0;
+unreg_rtnl:
+ rtnl_link_unregister(&ovpn_link_ops);
unreg_netdev:
unregister_netdevice_notifier(&ovpn_netdev_notifier);
return err;
@@ -95,6 +107,7 @@ static int __init ovpn_init(void)
static __exit void ovpn_cleanup(void)
{
+ ovpn_nl_unregister();
rtnl_link_unregister(&ovpn_link_ops);
unregister_netdevice_notifier(&ovpn_netdev_notifier);
diff --git a/drivers/net/ovpn/netlink-gen.c b/drivers/net/ovpn/netlink-gen.c
new file mode 100644
index 0000000000000000000000000000000000000000..9912706a2d68282e7d483404002cd0eeb1140ba6
--- /dev/null
+++ b/drivers/net/ovpn/netlink-gen.c
@@ -0,0 +1,224 @@
+// SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause)
+/* Do not edit directly, auto-generated from: */
+/* Documentation/netlink/specs/ovpn.yaml */
+/* YNL-GEN kernel source */
+
+#include <net/netlink.h>
+#include <net/genetlink.h>
+
+#include "netlink-gen.h"
+
+#include <uapi/linux/ovpn.h>
+
+/* Integer value ranges */
+static const struct netlink_range_validation ovpn_a_peer_id_range = {
+ .max = 16777215ULL,
+};
+
+static const struct netlink_range_validation ovpn_a_keyconf_peer_id_range = {
+ .max = 16777215ULL,
+};
+
+/* Common nested types */
+const struct nla_policy ovpn_keyconf_nl_policy[OVPN_A_KEYCONF_DECRYPT_DIR + 1] = {
+ [OVPN_A_KEYCONF_PEER_ID] = NLA_POLICY_FULL_RANGE(NLA_U32, &ovpn_a_keyconf_peer_id_range),
+ [OVPN_A_KEYCONF_SLOT] = NLA_POLICY_MAX(NLA_U32, 1),
+ [OVPN_A_KEYCONF_KEY_ID] = NLA_POLICY_MAX(NLA_U32, 7),
+ [OVPN_A_KEYCONF_CIPHER_ALG] = NLA_POLICY_MAX(NLA_U32, 2),
+ [OVPN_A_KEYCONF_ENCRYPT_DIR] = NLA_POLICY_NESTED(ovpn_keydir_nl_policy),
+ [OVPN_A_KEYCONF_DECRYPT_DIR] = NLA_POLICY_NESTED(ovpn_keydir_nl_policy),
+};
+
+const struct nla_policy ovpn_keydir_nl_policy[OVPN_A_KEYDIR_NONCE_TAIL + 1] = {
+ [OVPN_A_KEYDIR_CIPHER_KEY] = NLA_POLICY_MAX_LEN(256),
+ [OVPN_A_KEYDIR_NONCE_TAIL] = NLA_POLICY_EXACT_LEN(OVPN_NONCE_TAIL_SIZE),
+};
+
+const struct nla_policy ovpn_peer_nl_policy[OVPN_A_PEER_LINK_TX_PACKETS + 1] = {
+ [OVPN_A_PEER_ID] = NLA_POLICY_FULL_RANGE(NLA_U32, &ovpn_a_peer_id_range),
+ [OVPN_A_PEER_REMOTE_IPV4] = { .type = NLA_U32, },
+ [OVPN_A_PEER_REMOTE_IPV6] = NLA_POLICY_EXACT_LEN(16),
+ [OVPN_A_PEER_REMOTE_IPV6_SCOPE_ID] = { .type = NLA_U32, },
+ [OVPN_A_PEER_REMOTE_PORT] = NLA_POLICY_MIN(NLA_U16, 1),
+ [OVPN_A_PEER_SOCKET] = { .type = NLA_U32, },
+ [OVPN_A_PEER_VPN_IPV4] = { .type = NLA_U32, },
+ [OVPN_A_PEER_VPN_IPV6] = NLA_POLICY_EXACT_LEN(16),
+ [OVPN_A_PEER_LOCAL_IPV4] = { .type = NLA_U32, },
+ [OVPN_A_PEER_LOCAL_IPV6] = NLA_POLICY_EXACT_LEN(16),
+ [OVPN_A_PEER_LOCAL_PORT] = NLA_POLICY_MIN(NLA_U16, 1),
+ [OVPN_A_PEER_KEEPALIVE_INTERVAL] = { .type = NLA_U32, },
+ [OVPN_A_PEER_KEEPALIVE_TIMEOUT] = { .type = NLA_U32, },
+ [OVPN_A_PEER_DEL_REASON] = NLA_POLICY_MAX(NLA_U32, 4),
+ [OVPN_A_PEER_VPN_RX_BYTES] = { .type = NLA_UINT, },
+ [OVPN_A_PEER_VPN_TX_BYTES] = { .type = NLA_UINT, },
+ [OVPN_A_PEER_VPN_RX_PACKETS] = { .type = NLA_UINT, },
+ [OVPN_A_PEER_VPN_TX_PACKETS] = { .type = NLA_UINT, },
+ [OVPN_A_PEER_LINK_RX_BYTES] = { .type = NLA_UINT, },
+ [OVPN_A_PEER_LINK_TX_BYTES] = { .type = NLA_UINT, },
+ [OVPN_A_PEER_LINK_RX_PACKETS] = { .type = NLA_U32, },
+ [OVPN_A_PEER_LINK_TX_PACKETS] = { .type = NLA_U32, },
+};
+
+/* OVPN_CMD_DEV_NEW - do */
+static const struct nla_policy ovpn_dev_new_nl_policy[OVPN_A_MODE + 1] = {
+ [OVPN_A_IFNAME] = { .type = NLA_NUL_STRING, },
+ [OVPN_A_MODE] = NLA_POLICY_MAX(NLA_U32, 1),
+};
+
+/* OVPN_CMD_DEV_DEL - do */
+static const struct nla_policy ovpn_dev_del_nl_policy[OVPN_A_IFINDEX + 1] = {
+ [OVPN_A_IFINDEX] = { .type = NLA_U32, },
+};
+
+/* OVPN_CMD_PEER_NEW - do */
+static const struct nla_policy ovpn_peer_new_nl_policy[OVPN_A_PEER + 1] = {
+ [OVPN_A_IFINDEX] = { .type = NLA_U32, },
+ [OVPN_A_PEER] = NLA_POLICY_NESTED(ovpn_peer_nl_policy),
+};
+
+/* OVPN_CMD_PEER_SET - do */
+static const struct nla_policy ovpn_peer_set_nl_policy[OVPN_A_PEER + 1] = {
+ [OVPN_A_IFINDEX] = { .type = NLA_U32, },
+ [OVPN_A_PEER] = NLA_POLICY_NESTED(ovpn_peer_nl_policy),
+};
+
+/* OVPN_CMD_PEER_GET - do */
+static const struct nla_policy ovpn_peer_get_do_nl_policy[OVPN_A_PEER + 1] = {
+ [OVPN_A_IFINDEX] = { .type = NLA_U32, },
+ [OVPN_A_PEER] = NLA_POLICY_NESTED(ovpn_peer_nl_policy),
+};
+
+/* OVPN_CMD_PEER_GET - dump */
+static const struct nla_policy ovpn_peer_get_dump_nl_policy[OVPN_A_IFINDEX + 1] = {
+ [OVPN_A_IFINDEX] = { .type = NLA_U32, },
+};
+
+/* OVPN_CMD_PEER_DEL - do */
+static const struct nla_policy ovpn_peer_del_nl_policy[OVPN_A_PEER + 1] = {
+ [OVPN_A_IFINDEX] = { .type = NLA_U32, },
+ [OVPN_A_PEER] = NLA_POLICY_NESTED(ovpn_peer_nl_policy),
+};
+
+/* OVPN_CMD_KEY_NEW - do */
+static const struct nla_policy ovpn_key_new_nl_policy[OVPN_A_KEYCONF + 1] = {
+ [OVPN_A_IFINDEX] = { .type = NLA_U32, },
+ [OVPN_A_KEYCONF] = NLA_POLICY_NESTED(ovpn_keyconf_nl_policy),
+};
+
+/* OVPN_CMD_KEY_SWAP - do */
+static const struct nla_policy ovpn_key_swap_nl_policy[OVPN_A_KEYCONF + 1] = {
+ [OVPN_A_IFINDEX] = { .type = NLA_U32, },
+ [OVPN_A_KEYCONF] = NLA_POLICY_NESTED(ovpn_keyconf_nl_policy),
+};
+
+/* OVPN_CMD_KEY_DEL - do */
+static const struct nla_policy ovpn_key_del_nl_policy[OVPN_A_KEYCONF + 1] = {
+ [OVPN_A_IFINDEX] = { .type = NLA_U32, },
+ [OVPN_A_KEYCONF] = NLA_POLICY_NESTED(ovpn_keyconf_nl_policy),
+};
+
+/* Ops table for ovpn */
+static const struct genl_split_ops ovpn_nl_ops[] = {
+ {
+ .cmd = OVPN_CMD_DEV_NEW,
+ .doit = ovpn_nl_dev_new_doit,
+ .policy = ovpn_dev_new_nl_policy,
+ .maxattr = OVPN_A_MODE,
+ .flags = GENL_ADMIN_PERM | GENL_CMD_CAP_DO,
+ },
+ {
+ .cmd = OVPN_CMD_DEV_DEL,
+ .pre_doit = ovpn_nl_pre_doit,
+ .doit = ovpn_nl_dev_del_doit,
+ .post_doit = ovpn_nl_post_doit,
+ .policy = ovpn_dev_del_nl_policy,
+ .maxattr = OVPN_A_IFINDEX,
+ .flags = GENL_ADMIN_PERM | GENL_CMD_CAP_DO,
+ },
+ {
+ .cmd = OVPN_CMD_PEER_NEW,
+ .pre_doit = ovpn_nl_pre_doit,
+ .doit = ovpn_nl_peer_new_doit,
+ .post_doit = ovpn_nl_post_doit,
+ .policy = ovpn_peer_new_nl_policy,
+ .maxattr = OVPN_A_PEER,
+ .flags = GENL_ADMIN_PERM | GENL_CMD_CAP_DO,
+ },
+ {
+ .cmd = OVPN_CMD_PEER_SET,
+ .pre_doit = ovpn_nl_pre_doit,
+ .doit = ovpn_nl_peer_set_doit,
+ .post_doit = ovpn_nl_post_doit,
+ .policy = ovpn_peer_set_nl_policy,
+ .maxattr = OVPN_A_PEER,
+ .flags = GENL_ADMIN_PERM | GENL_CMD_CAP_DO,
+ },
+ {
+ .cmd = OVPN_CMD_PEER_GET,
+ .pre_doit = ovpn_nl_pre_doit,
+ .doit = ovpn_nl_peer_get_doit,
+ .post_doit = ovpn_nl_post_doit,
+ .policy = ovpn_peer_get_do_nl_policy,
+ .maxattr = OVPN_A_PEER,
+ .flags = GENL_ADMIN_PERM | GENL_CMD_CAP_DO,
+ },
+ {
+ .cmd = OVPN_CMD_PEER_GET,
+ .dumpit = ovpn_nl_peer_get_dumpit,
+ .policy = ovpn_peer_get_dump_nl_policy,
+ .maxattr = OVPN_A_IFINDEX,
+ .flags = GENL_ADMIN_PERM | GENL_CMD_CAP_DUMP,
+ },
+ {
+ .cmd = OVPN_CMD_PEER_DEL,
+ .pre_doit = ovpn_nl_pre_doit,
+ .doit = ovpn_nl_peer_del_doit,
+ .post_doit = ovpn_nl_post_doit,
+ .policy = ovpn_peer_del_nl_policy,
+ .maxattr = OVPN_A_PEER,
+ .flags = GENL_ADMIN_PERM | GENL_CMD_CAP_DO,
+ },
+ {
+ .cmd = OVPN_CMD_KEY_NEW,
+ .pre_doit = ovpn_nl_pre_doit,
+ .doit = ovpn_nl_key_new_doit,
+ .post_doit = ovpn_nl_post_doit,
+ .policy = ovpn_key_new_nl_policy,
+ .maxattr = OVPN_A_KEYCONF,
+ .flags = GENL_ADMIN_PERM | GENL_CMD_CAP_DO,
+ },
+ {
+ .cmd = OVPN_CMD_KEY_SWAP,
+ .pre_doit = ovpn_nl_pre_doit,
+ .doit = ovpn_nl_key_swap_doit,
+ .post_doit = ovpn_nl_post_doit,
+ .policy = ovpn_key_swap_nl_policy,
+ .maxattr = OVPN_A_KEYCONF,
+ .flags = GENL_ADMIN_PERM | GENL_CMD_CAP_DO,
+ },
+ {
+ .cmd = OVPN_CMD_KEY_DEL,
+ .pre_doit = ovpn_nl_pre_doit,
+ .doit = ovpn_nl_key_del_doit,
+ .post_doit = ovpn_nl_post_doit,
+ .policy = ovpn_key_del_nl_policy,
+ .maxattr = OVPN_A_KEYCONF,
+ .flags = GENL_ADMIN_PERM | GENL_CMD_CAP_DO,
+ },
+};
+
+static const struct genl_multicast_group ovpn_nl_mcgrps[] = {
+ [OVPN_NLGRP_PEERS] = { "peers", },
+};
+
+struct genl_family ovpn_nl_family __ro_after_init = {
+ .name = OVPN_FAMILY_NAME,
+ .version = OVPN_FAMILY_VERSION,
+ .netnsok = true,
+ .parallel_ops = true,
+ .module = THIS_MODULE,
+ .split_ops = ovpn_nl_ops,
+ .n_split_ops = ARRAY_SIZE(ovpn_nl_ops),
+ .mcgrps = ovpn_nl_mcgrps,
+ .n_mcgrps = ARRAY_SIZE(ovpn_nl_mcgrps),
+};
diff --git a/drivers/net/ovpn/netlink-gen.h b/drivers/net/ovpn/netlink-gen.h
new file mode 100644
index 0000000000000000000000000000000000000000..1b7aeb80af1091d5fe968c886fb019ba6f9a19a8
--- /dev/null
+++ b/drivers/net/ovpn/netlink-gen.h
@@ -0,0 +1,42 @@
+/* SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) */
+/* Do not edit directly, auto-generated from: */
+/* Documentation/netlink/specs/ovpn.yaml */
+/* YNL-GEN kernel header */
+
+#ifndef _LINUX_OVPN_GEN_H
+#define _LINUX_OVPN_GEN_H
+
+#include <net/netlink.h>
+#include <net/genetlink.h>
+
+#include <uapi/linux/ovpn.h>
+
+/* Common nested types */
+extern const struct nla_policy ovpn_keyconf_nl_policy[OVPN_A_KEYCONF_DECRYPT_DIR + 1];
+extern const struct nla_policy ovpn_keydir_nl_policy[OVPN_A_KEYDIR_NONCE_TAIL + 1];
+extern const struct nla_policy ovpn_peer_nl_policy[OVPN_A_PEER_LINK_TX_PACKETS + 1];
+
+int ovpn_nl_pre_doit(const struct genl_split_ops *ops, struct sk_buff *skb,
+ struct genl_info *info);
+void
+ovpn_nl_post_doit(const struct genl_split_ops *ops, struct sk_buff *skb,
+ struct genl_info *info);
+
+int ovpn_nl_dev_new_doit(struct sk_buff *skb, struct genl_info *info);
+int ovpn_nl_dev_del_doit(struct sk_buff *skb, struct genl_info *info);
+int ovpn_nl_peer_new_doit(struct sk_buff *skb, struct genl_info *info);
+int ovpn_nl_peer_set_doit(struct sk_buff *skb, struct genl_info *info);
+int ovpn_nl_peer_get_doit(struct sk_buff *skb, struct genl_info *info);
+int ovpn_nl_peer_get_dumpit(struct sk_buff *skb, struct netlink_callback *cb);
+int ovpn_nl_peer_del_doit(struct sk_buff *skb, struct genl_info *info);
+int ovpn_nl_key_new_doit(struct sk_buff *skb, struct genl_info *info);
+int ovpn_nl_key_swap_doit(struct sk_buff *skb, struct genl_info *info);
+int ovpn_nl_key_del_doit(struct sk_buff *skb, struct genl_info *info);
+
+enum {
+ OVPN_NLGRP_PEERS,
+};
+
+extern struct genl_family ovpn_nl_family;
+
+#endif /* _LINUX_OVPN_GEN_H */
diff --git a/drivers/net/ovpn/netlink.c b/drivers/net/ovpn/netlink.c
new file mode 100644
index 0000000000000000000000000000000000000000..7b6b4d03b845eeb8654e37ac3495e8172ac3f291
--- /dev/null
+++ b/drivers/net/ovpn/netlink.c
@@ -0,0 +1,158 @@
+// SPDX-License-Identifier: GPL-2.0
+/* OpenVPN data channel offload
+ *
+ * Copyright (C) 2020-2024 OpenVPN, Inc.
+ *
+ * Author: Antonio Quartulli <antonio@xxxxxxxxxxx>
+ */
+
+#include <linux/netdevice.h>
+#include <net/genetlink.h>
+
+#include <uapi/linux/ovpn.h>
+
+#include "ovpnstruct.h"
+#include "main.h"
+#include "io.h"
+#include "netlink.h"
+#include "netlink-gen.h"
+
+MODULE_ALIAS_GENL_FAMILY(OVPN_FAMILY_NAME);
+
+/**
+ * ovpn_get_dev_from_attrs - retrieve the netdevice a netlink message is
+ * targeting
+ * @net: network namespace where to look for the interface
+ * @info: generic netlink info from the user request
+ *
+ * Return: the netdevice, if found, or an error otherwise
+ */
+static struct net_device *
+ovpn_get_dev_from_attrs(struct net *net, const struct genl_info *info)
+{
+ struct net_device *dev;
+ int ifindex;
+
+ if (GENL_REQ_ATTR_CHECK(info, OVPN_A_IFINDEX))
+ return ERR_PTR(-EINVAL);
+
+ ifindex = nla_get_u32(info->attrs[OVPN_A_IFINDEX]);
+
+ dev = dev_get_by_index(net, ifindex);
+ if (!dev) {
+ NL_SET_ERR_MSG_MOD(info->extack,
+ "ifindex does not match any interface");
+ return ERR_PTR(-ENODEV);
+ }
+
+ if (!ovpn_dev_is_valid(dev))
+ goto err_put_dev;
+
+ return dev;
+
+err_put_dev:
+ netdev_put(dev, NULL);
+
+ NL_SET_ERR_MSG_MOD(info->extack, "specified interface is not ovpn");
+ NL_SET_BAD_ATTR(info->extack, info->attrs[OVPN_A_IFINDEX]);
+
+ return ERR_PTR(-EINVAL);
+}
+
+int ovpn_nl_pre_doit(const struct genl_split_ops *ops, struct sk_buff *skb,
+ struct genl_info *info)
+{
+ struct net *net = genl_info_net(info);
+ struct net_device *dev = ovpn_get_dev_from_attrs(net, info);
+
+ if (IS_ERR(dev))
+ return PTR_ERR(dev);
+
+ info->user_ptr[0] = netdev_priv(dev);
+
+ return 0;
+}
+
+void ovpn_nl_post_doit(const struct genl_split_ops *ops, struct sk_buff *skb,
+ struct genl_info *info)
+{
+ struct ovpn_struct *ovpn = info->user_ptr[0];
+
+ if (ovpn)
+ netdev_put(ovpn->dev, NULL);
+}
+
+int ovpn_nl_dev_new_doit(struct sk_buff *skb, struct genl_info *info)
+{
+ return -EOPNOTSUPP;
+}
+
+int ovpn_nl_dev_del_doit(struct sk_buff *skb, struct genl_info *info)
+{
+ return -EOPNOTSUPP;
+}
+
+int ovpn_nl_peer_new_doit(struct sk_buff *skb, struct genl_info *info)
+{
+ return -EOPNOTSUPP;
+}
+
+int ovpn_nl_peer_set_doit(struct sk_buff *skb, struct genl_info *info)
+{
+ return -EOPNOTSUPP;
+}
+
+int ovpn_nl_peer_get_doit(struct sk_buff *skb, struct genl_info *info)
+{
+ return -EOPNOTSUPP;
+}
+
+int ovpn_nl_peer_get_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ return -EOPNOTSUPP;
+}
+
+int ovpn_nl_peer_del_doit(struct sk_buff *skb, struct genl_info *info)
+{
+ return -EOPNOTSUPP;
+}
+
+int ovpn_nl_key_new_doit(struct sk_buff *skb, struct genl_info *info)
+{
+ return -EOPNOTSUPP;
+}
+
+int ovpn_nl_key_swap_doit(struct sk_buff *skb, struct genl_info *info)
+{
+ return -EOPNOTSUPP;
+}
+
+int ovpn_nl_key_del_doit(struct sk_buff *skb, struct genl_info *info)
+{
+ return -EOPNOTSUPP;
+}
+
+/**
+ * ovpn_nl_register - perform any needed registration in the NL subsustem
+ *
+ * Return: 0 on success, a negative error code otherwise
+ */
+int __init ovpn_nl_register(void)
+{
+ int ret = genl_register_family(&ovpn_nl_family);
+
+ if (ret) {
+ pr_err("ovpn: genl_register_family failed: %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+/**
+ * ovpn_nl_unregister - undo any module wide netlink registration
+ */
+void ovpn_nl_unregister(void)
+{
+ genl_unregister_family(&ovpn_nl_family);
+}
diff --git a/drivers/net/ovpn/netlink.h b/drivers/net/ovpn/netlink.h
new file mode 100644
index 0000000000000000000000000000000000000000..9e87cf11d1e9813b7a75ddf3705ab7d5fabe899f
--- /dev/null
+++ b/drivers/net/ovpn/netlink.h
@@ -0,0 +1,15 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/* OpenVPN data channel offload
+ *
+ * Copyright (C) 2020-2024 OpenVPN, Inc.
+ *
+ * Author: Antonio Quartulli <antonio@xxxxxxxxxxx>
+ */
+
+#ifndef _NET_OVPN_NETLINK_H_
+#define _NET_OVPN_NETLINK_H_
+
+int ovpn_nl_register(void);
+void ovpn_nl_unregister(void);
+
+#endif /* _NET_OVPN_NETLINK_H_ */
diff --git a/drivers/net/ovpn/ovpnstruct.h b/drivers/net/ovpn/ovpnstruct.h
new file mode 100644
index 0000000000000000000000000000000000000000..ff248cad1401d00c5bf0aadf9341e40d0a4aee4b
--- /dev/null
+++ b/drivers/net/ovpn/ovpnstruct.h
@@ -0,0 +1,21 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/* OpenVPN data channel offload
+ *
+ * Copyright (C) 2019-2024 OpenVPN, Inc.
+ *
+ * Author: James Yonan <james@xxxxxxxxxxx>
+ * Antonio Quartulli <antonio@xxxxxxxxxxx>
+ */
+
+#ifndef _NET_OVPN_OVPNSTRUCT_H_
+#define _NET_OVPN_OVPNSTRUCT_H_
+
+/**
+ * struct ovpn_struct - per ovpn interface state
+ * @dev: the actual netdev representing the tunnel
+ */
+struct ovpn_struct {
+ struct net_device *dev;
+};
+
+#endif /* _NET_OVPN_OVPNSTRUCT_H_ */
diff --git a/include/uapi/linux/ovpn.h b/include/uapi/linux/ovpn.h
new file mode 100644
index 0000000000000000000000000000000000000000..adf4cafd9624308cc7bf1935bba55fb38bb6ba8c
--- /dev/null
+++ b/include/uapi/linux/ovpn.h
@@ -0,0 +1,116 @@
+/* SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) */
+/* Do not edit directly, auto-generated from: */
+/* Documentation/netlink/specs/ovpn.yaml */
+/* YNL-GEN uapi header */
+
+#ifndef _UAPI_LINUX_OVPN_H
+#define _UAPI_LINUX_OVPN_H
+
+#define OVPN_FAMILY_NAME "ovpn"
+#define OVPN_FAMILY_VERSION 1
+
+#define OVPN_NONCE_TAIL_SIZE 8
+
+enum ovpn_cipher_alg {
+ OVPN_CIPHER_ALG_NONE,
+ OVPN_CIPHER_ALG_AES_GCM,
+ OVPN_CIPHER_ALG_CHACHA20_POLY1305,
+};
+
+enum ovpn_del_peer_reason {
+ OVPN_DEL_PEER_REASON_TEARDOWN,
+ OVPN_DEL_PEER_REASON_USERSPACE,
+ OVPN_DEL_PEER_REASON_EXPIRED,
+ OVPN_DEL_PEER_REASON_TRANSPORT_ERROR,
+ OVPN_DEL_PEER_REASON_TRANSPORT_DISCONNECT,
+};
+
+enum ovpn_key_slot {
+ OVPN_KEY_SLOT_PRIMARY,
+ OVPN_KEY_SLOT_SECONDARY,
+};
+
+enum ovpn_mode {
+ OVPN_MODE_P2P,
+ OVPN_MODE_MP,
+};
+
+enum {
+ OVPN_A_PEER_ID = 1,
+ OVPN_A_PEER_REMOTE_IPV4,
+ OVPN_A_PEER_REMOTE_IPV6,
+ OVPN_A_PEER_REMOTE_IPV6_SCOPE_ID,
+ OVPN_A_PEER_REMOTE_PORT,
+ OVPN_A_PEER_SOCKET,
+ OVPN_A_PEER_VPN_IPV4,
+ OVPN_A_PEER_VPN_IPV6,
+ OVPN_A_PEER_LOCAL_IPV4,
+ OVPN_A_PEER_LOCAL_IPV6,
+ OVPN_A_PEER_LOCAL_PORT,
+ OVPN_A_PEER_KEEPALIVE_INTERVAL,
+ OVPN_A_PEER_KEEPALIVE_TIMEOUT,
+ OVPN_A_PEER_DEL_REASON,
+ OVPN_A_PEER_VPN_RX_BYTES,
+ OVPN_A_PEER_VPN_TX_BYTES,
+ OVPN_A_PEER_VPN_RX_PACKETS,
+ OVPN_A_PEER_VPN_TX_PACKETS,
+ OVPN_A_PEER_LINK_RX_BYTES,
+ OVPN_A_PEER_LINK_TX_BYTES,
+ OVPN_A_PEER_LINK_RX_PACKETS,
+ OVPN_A_PEER_LINK_TX_PACKETS,
+
+ __OVPN_A_PEER_MAX,
+ OVPN_A_PEER_MAX = (__OVPN_A_PEER_MAX - 1)
+};
+
+enum {
+ OVPN_A_KEYCONF_PEER_ID = 1,
+ OVPN_A_KEYCONF_SLOT,
+ OVPN_A_KEYCONF_KEY_ID,
+ OVPN_A_KEYCONF_CIPHER_ALG,
+ OVPN_A_KEYCONF_ENCRYPT_DIR,
+ OVPN_A_KEYCONF_DECRYPT_DIR,
+
+ __OVPN_A_KEYCONF_MAX,
+ OVPN_A_KEYCONF_MAX = (__OVPN_A_KEYCONF_MAX - 1)
+};
+
+enum {
+ OVPN_A_KEYDIR_CIPHER_KEY = 1,
+ OVPN_A_KEYDIR_NONCE_TAIL,
+
+ __OVPN_A_KEYDIR_MAX,
+ OVPN_A_KEYDIR_MAX = (__OVPN_A_KEYDIR_MAX - 1)
+};
+
+enum {
+ OVPN_A_IFINDEX = 1,
+ OVPN_A_IFNAME,
+ OVPN_A_MODE,
+ OVPN_A_PEER,
+ OVPN_A_KEYCONF,
+
+ __OVPN_A_MAX,
+ OVPN_A_MAX = (__OVPN_A_MAX - 1)
+};
+
+enum {
+ OVPN_CMD_DEV_NEW = 1,
+ OVPN_CMD_DEV_DEL,
+ OVPN_CMD_PEER_NEW,
+ OVPN_CMD_PEER_SET,
+ OVPN_CMD_PEER_GET,
+ OVPN_CMD_PEER_DEL,
+ OVPN_CMD_PEER_DEL_NTF,
+ OVPN_CMD_KEY_NEW,
+ OVPN_CMD_KEY_SWAP,
+ OVPN_CMD_KEY_SWAP_NTF,
+ OVPN_CMD_KEY_DEL,
+
+ __OVPN_CMD_MAX,
+ OVPN_CMD_MAX = (__OVPN_CMD_MAX - 1)
+};
+
+#define OVPN_MCGRP_PEERS "peers"
+
+#endif /* _UAPI_LINUX_OVPN_H */
--
2.45.2