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 | 59 ++++++++++++++++++++++++++++++++++++++++++++-- 2 files changed, 59 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ovpn/main.h b/drivers/net/ovpn/main.h index 4dfcba9deb590bbf119f51a40dff1517fe227b22..c664d9c655734263fcf58dd8f2fa5446565a29cf 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 7b6b4d03b845eeb8654e37ac3495e8172ac3f291..6e60591d605dde19c6bbd47ef0e90e522776688c 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 +85,66 @@ void ovpn_nl_post_doit(const struct genl_split_ops *ops, struct sk_buff *skb,
int ovpn_nl_dev_new_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; + } + + if (nla_put_u32(msg, OVPN_A_IFINDEX, dev->ifindex)) { + genlmsg_cancel(msg, hdr); + nlmsg_free(msg); + return -EMSGSIZE; + } + + genlmsg_end(msg, hdr); + + return genlmsg_reply(msg, info); }
int ovpn_nl_dev_del_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_peer_new_doit(struct sk_buff *skb, struct genl_info *info)