[PATCH net-next v4 06/25] ovpn: implement interface creation/destruction via netlink
From: Antonio Quartulli <antonio@openvpn.net>
Date: 2024-06-24 11:29:52
Subsystem:
networking drivers, openvpn data channel offload, the rest · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Antonio Quartulli, Linus Torvalds
Allow userspace to create and destroy an interface using netlink commands. Signed-off-by: Antonio Quartulli <antonio@openvpn.net> --- drivers/net/ovpn/main.h | 2 ++ drivers/net/ovpn/netlink.c | 53 ++++++++++++++++++++++++++++++++++++-- 2 files changed, 53 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ovpn/main.h b/drivers/net/ovpn/main.h
index 4dfcba9deb59..c664d9c65573 100644
--- a/drivers/net/ovpn/main.h
+++ b/drivers/net/ovpn/main.h@@ -10,6 +10,8 @@ #ifndef _NET_OVPN_MAIN_H_ #define _NET_OVPN_MAIN_H_ +#define OVPN_DEFAULT_IFNAME "ovpn%d" + struct net_device *ovpn_iface_create(const char *name, enum ovpn_mode mode, struct net *net); void ovpn_iface_destruct(struct ovpn_struct *ovpn);
diff --git a/drivers/net/ovpn/netlink.c b/drivers/net/ovpn/netlink.c
index 5f2c1eacc463..28f2216214b0 100644
--- a/drivers/net/ovpn/netlink.c
+++ b/drivers/net/ovpn/netlink.c@@ -7,6 +7,7 @@ */ #include <linux/netdevice.h> +#include <linux/rtnetlink.h> #include <net/genetlink.h> #include <uapi/linux/ovpn.h>
@@ -84,12 +85,60 @@ void ovpn_nl_post_doit(const struct genl_split_ops *ops, struct sk_buff *skb, int ovpn_nl_new_iface_doit(struct sk_buff *skb, struct genl_info *info) { - return -EOPNOTSUPP; + const char *ifname = OVPN_DEFAULT_IFNAME; + enum ovpn_mode mode = OVPN_MODE_P2P; + struct net_device *dev; + struct sk_buff *msg; + void *hdr; + + if (info->attrs[OVPN_A_IFNAME]) + ifname = nla_data(info->attrs[OVPN_A_IFNAME]); + + if (info->attrs[OVPN_A_MODE]) { + mode = nla_get_u32(info->attrs[OVPN_A_MODE]); + pr_debug("ovpn: setting device (%s) mode: %u\n", ifname, mode); + } + + dev = ovpn_iface_create(ifname, mode, genl_info_net(info)); + if (IS_ERR(dev)) { + NL_SET_ERR_MSG_FMT_MOD(info->extack, + "error while creating interface: %ld", + PTR_ERR(dev)); + return PTR_ERR(dev); + } + + msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); + if (!msg) + return -ENOMEM; + + hdr = genlmsg_iput(msg, info); + if (!hdr) { + nlmsg_free(msg); + return -ENOBUFS; + } + + if (nla_put_string(msg, OVPN_A_IFNAME, dev->name)) { + genlmsg_cancel(msg, hdr); + nlmsg_free(msg); + return -EMSGSIZE; + } + + genlmsg_end(msg, hdr); + + return genlmsg_reply(msg, info); } int ovpn_nl_del_iface_doit(struct sk_buff *skb, struct genl_info *info) { - return -EOPNOTSUPP; + struct ovpn_struct *ovpn = info->user_ptr[0]; + + rtnl_lock(); + ovpn_iface_destruct(ovpn); + unregister_netdevice(ovpn->dev); + netdev_put(ovpn->dev, NULL); + rtnl_unlock(); + + return 0; } int ovpn_nl_set_peer_doit(struct sk_buff *skb, struct genl_info *info)
--
2.44.2