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Message-ID: <20240627130843.21042-21-antonio@openvpn.net>
Date: Thu, 27 Jun 2024 15:08:38 +0200
From: Antonio Quartulli <antonio@...nvpn.net>
To: netdev@...r.kernel.org
Cc: kuba@...nel.org,
ryazanov.s.a@...il.com,
pabeni@...hat.com,
edumazet@...gle.com,
andrew@...n.ch,
sd@...asysnail.net,
Antonio Quartulli <antonio@...nvpn.net>
Subject: [PATCH net-next v5 20/25] ovpn: implement peer add/dump/delete via netlink
This change introduces the netlink command needed to add, delete and
retrieve/dump known peers. Userspace is expected to use these commands
to handle known peer lifecycles.
Signed-off-by: Antonio Quartulli <antonio@...nvpn.net>
---
drivers/net/ovpn/netlink.c | 487 ++++++++++++++++++++++++++++++++++++-
drivers/net/ovpn/peer.c | 8 +-
drivers/net/ovpn/peer.h | 4 +
3 files changed, 490 insertions(+), 9 deletions(-)
diff --git a/drivers/net/ovpn/netlink.c b/drivers/net/ovpn/netlink.c
index ecac4721f0c6..e0d35c4ac2fb 100644
--- a/drivers/net/ovpn/netlink.c
+++ b/drivers/net/ovpn/netlink.c
@@ -8,6 +8,7 @@
#include <linux/netdevice.h>
#include <linux/rtnetlink.h>
+#include <linux/types.h>
#include <net/genetlink.h>
#include <uapi/linux/ovpn.h>
@@ -17,6 +18,10 @@
#include "io.h"
#include "netlink.h"
#include "netlink-gen.h"
+#include "bind.h"
+#include "packet.h"
+#include "peer.h"
+#include "socket.h"
MODULE_ALIAS_GENL_FAMILY(OVPN_FAMILY_NAME);
@@ -29,7 +34,7 @@ MODULE_ALIAS_GENL_FAMILY(OVPN_FAMILY_NAME);
* Return: the netdevice, if found, or an error otherwise
*/
static struct net_device *
-ovpn_get_dev_from_attrs(struct net *net, struct genl_info *info)
+ovpn_get_dev_from_attrs(struct net *net, const struct genl_info *info)
{
struct net_device *dev;
int ifindex;
@@ -141,24 +146,496 @@ int ovpn_nl_del_iface_doit(struct sk_buff *skb, struct genl_info *info)
return 0;
}
+static u8 *ovpn_nl_attr_local_ip(struct genl_info *info,
+ struct ovpn_struct *ovpn,
+ struct nlattr **attrs, int sock_fam)
+{
+ size_t ip_len = nla_len(attrs[OVPN_A_PEER_LOCAL_IP]);
+ u8 *local_ip = nla_data(attrs[OVPN_A_PEER_LOCAL_IP]);
+ bool is_mapped;
+
+ if (ip_len == sizeof(struct in_addr)) {
+ if (sock_fam != AF_INET) {
+ NL_SET_ERR_MSG_MOD(info->extack,
+ "mismatching AF between local IP (v4) and peer");
+ return ERR_PTR(-EINVAL);
+ }
+ } else if (ip_len == sizeof(struct in6_addr)) {
+ is_mapped = ipv6_addr_v4mapped((struct in6_addr *)local_ip);
+
+ if (sock_fam != AF_INET6 && !is_mapped) {
+ NL_SET_ERR_MSG_MOD(info->extack,
+ "mismatching AF between local IP (v6) and peer");
+ return ERR_PTR(-EINVAL);
+ }
+
+ if (is_mapped)
+ /* this is an IPv6-mapped IPv4
+ * address, therefore extract
+ * the actual v4 address from
+ * the last 4 bytes
+ */
+ local_ip += 12;
+ } else {
+ NL_SET_ERR_MSG_FMT_MOD(info->extack,
+ "invalid local IP length: %zu", ip_len);
+ return ERR_PTR(-EINVAL);
+ }
+
+ return local_ip;
+}
+
int ovpn_nl_set_peer_doit(struct sk_buff *skb, struct genl_info *info)
{
- return -EOPNOTSUPP;
+ bool keepalive_set = false, new_peer = false;
+ struct nlattr *attrs[OVPN_A_PEER_MAX + 1];
+ struct ovpn_struct *ovpn = info->user_ptr[0];
+ struct sockaddr_storage *ss = NULL;
+ u32 sockfd, id, interv, timeout;
+ struct socket *sock = NULL;
+ struct sockaddr_in mapped;
+ struct sockaddr_in6 *in6;
+ struct ovpn_peer *peer;
+ u8 *local_ip = NULL;
+ size_t sa_len;
+ int ret;
+
+ if (GENL_REQ_ATTR_CHECK(info, OVPN_A_PEER))
+ return -EINVAL;
+
+ ret = nla_parse_nested(attrs, OVPN_A_PEER_MAX, info->attrs[OVPN_A_PEER],
+ ovpn_peer_nl_policy, info->extack);
+ if (ret)
+ return ret;
+
+ if (NL_REQ_ATTR_CHECK(info->extack, info->attrs[OVPN_A_PEER], attrs,
+ OVPN_A_PEER_ID))
+ return -EINVAL;
+
+ id = nla_get_u32(attrs[OVPN_A_PEER_ID]);
+ /* check if the peer exists first, otherwise create a new one */
+ peer = ovpn_peer_get_by_id(ovpn, id);
+ if (!peer) {
+ peer = ovpn_peer_new(ovpn, id);
+ new_peer = true;
+ if (IS_ERR(peer)) {
+ NL_SET_ERR_MSG_FMT_MOD(info->extack,
+ "cannot create new peer object for peer %u (sockaddr=%pIScp): %ld",
+ id, ss, PTR_ERR(peer));
+ return PTR_ERR(peer);
+ }
+ }
+
+ if (new_peer && NL_REQ_ATTR_CHECK(info->extack,
+ info->attrs[OVPN_A_PEER], attrs,
+ OVPN_A_PEER_SOCKET)) {
+ ret = -EINVAL;
+ goto peer_release;
+ }
+
+ if (new_peer && ovpn->mode == OVPN_MODE_MP &&
+ !attrs[OVPN_A_PEER_VPN_IPV4] && !attrs[OVPN_A_PEER_VPN_IPV6]) {
+ NL_SET_ERR_MSG_MOD(info->extack,
+ "a VPN IP is required when adding a peer in MP mode");
+ ret = -EINVAL;
+ goto peer_release;
+ }
+
+ if (attrs[OVPN_A_PEER_SOCKET]) {
+ /* lookup the fd in the kernel table and extract the socket
+ * object
+ */
+ sockfd = nla_get_u32(attrs[OVPN_A_PEER_SOCKET]);
+ /* sockfd_lookup() increases sock's refcounter */
+ sock = sockfd_lookup(sockfd, &ret);
+ if (!sock) {
+ NL_SET_ERR_MSG_FMT_MOD(info->extack,
+ "cannot lookup peer socket (fd=%u): %d",
+ sockfd, ret);
+ ret = -ENOTSOCK;
+ goto peer_release;
+ }
+
+ if (peer->sock)
+ ovpn_socket_put(peer->sock);
+
+ peer->sock = ovpn_socket_new(sock, peer);
+ if (IS_ERR(peer->sock)) {
+ NL_SET_ERR_MSG_FMT_MOD(info->extack,
+ "cannot encapsulate socket: %ld",
+ PTR_ERR(peer->sock));
+ sockfd_put(sock);
+ peer->sock = NULL;
+ ret = -ENOTSOCK;
+ goto peer_release;
+ }
+ }
+
+ /* Only when using UDP as transport protocol the remote endpoint
+ * can be configured so that ovpn knows where to send packets
+ * to.
+ *
+ * In case of TCP, the socket is connected to the peer and ovpn
+ * will just send bytes over it, without the need to specify a
+ * destination.
+ */
+ if (peer->sock->sock->sk->sk_protocol == IPPROTO_UDP &&
+ attrs[OVPN_A_PEER_SOCKADDR_REMOTE]) {
+ ss = nla_data(attrs[OVPN_A_PEER_SOCKADDR_REMOTE]);
+ sa_len = nla_len(attrs[OVPN_A_PEER_SOCKADDR_REMOTE]);
+ switch (sa_len) {
+ case sizeof(struct sockaddr_in):
+ if (ss->ss_family == AF_INET)
+ /* valid sockaddr */
+ break;
+
+ NL_SET_ERR_MSG_MOD(info->extack,
+ "remote sockaddr_in has invalid family");
+ ret = -EINVAL;
+ goto peer_release;
+ case sizeof(struct sockaddr_in6):
+ if (ss->ss_family == AF_INET6)
+ /* valid sockaddr */
+ break;
+
+ NL_SET_ERR_MSG_MOD(info->extack,
+ "remote sockaddr_in6 has invalid family");
+ ret = -EINVAL;
+ goto peer_release;
+ default:
+ NL_SET_ERR_MSG_FMT_MOD(info->extack,
+ "invalid size for sockaddr: %zd",
+ sa_len);
+ ret = -EINVAL;
+ goto peer_release;
+ }
+
+ /* if this is a v6-mapped-v4, convert the sockaddr
+ * object from AF_INET6 to AF_INET before continue
+ * processing
+ */
+ if (ss->ss_family == AF_INET6) {
+ in6 = (struct sockaddr_in6 *)ss;
+
+ if (ipv6_addr_v4mapped(&in6->sin6_addr)) {
+ mapped.sin_family = AF_INET;
+ mapped.sin_addr.s_addr =
+ in6->sin6_addr.s6_addr32[3];
+ mapped.sin_port = in6->sin6_port;
+ ss = (struct sockaddr_storage *)&mapped;
+ }
+ }
+
+ if (attrs[OVPN_A_PEER_LOCAL_IP]) {
+ local_ip = ovpn_nl_attr_local_ip(info, ovpn,
+ attrs,
+ ss->ss_family);
+ if (IS_ERR(local_ip)) {
+ ret = PTR_ERR(local_ip);
+ NL_SET_ERR_MSG_FMT_MOD(info->extack,
+ "cannot retrieve local IP: %d",
+ ret);
+ goto peer_release;
+ }
+ }
+
+ /* set peer sockaddr */
+ ret = ovpn_peer_reset_sockaddr(peer, ss, local_ip);
+ if (ret < 0) {
+ NL_SET_ERR_MSG_FMT_MOD(info->extack,
+ "cannot set peer sockaddr: %d",
+ ret);
+ goto peer_release;
+ }
+ }
+
+ /* VPN IPs cannot be updated, because they are hashed */
+ if (new_peer && attrs[OVPN_A_PEER_VPN_IPV4])
+ peer->vpn_addrs.ipv4.s_addr =
+ nla_get_in_addr(attrs[OVPN_A_PEER_VPN_IPV4]);
+
+ /* VPN IPs cannot be updated, because they are hashed */
+ if (new_peer && attrs[OVPN_A_PEER_VPN_IPV6])
+ peer->vpn_addrs.ipv6 =
+ nla_get_in6_addr(attrs[OVPN_A_PEER_VPN_IPV6]);
+
+ /* when setting the keepalive, both parameters have to be configured */
+ if (attrs[OVPN_A_PEER_KEEPALIVE_INTERVAL] &&
+ attrs[OVPN_A_PEER_KEEPALIVE_TIMEOUT]) {
+ keepalive_set = true;
+ interv = nla_get_u32(attrs[OVPN_A_PEER_KEEPALIVE_INTERVAL]);
+ timeout = nla_get_u32(attrs[OVPN_A_PEER_KEEPALIVE_TIMEOUT]);
+ }
+
+ if (keepalive_set)
+ ovpn_peer_keepalive_set(peer, interv, timeout);
+
+ netdev_dbg(ovpn->dev,
+ "%s: %s peer with endpoint=%pIScp/%s id=%u VPN-IPv4=%pI4 VPN-IPv6=%pI6c\n",
+ __func__, (new_peer ? "adding" : "modifying"), ss,
+ peer->sock->sock->sk->sk_prot_creator->name, peer->id,
+ &peer->vpn_addrs.ipv4.s_addr, &peer->vpn_addrs.ipv6);
+
+ if (new_peer) {
+ ret = ovpn_peer_add(ovpn, peer);
+ if (ret < 0) {
+ NL_SET_ERR_MSG_FMT_MOD(info->extack,
+ "cannot add new peer (id=%u) to hashtable: %d\n",
+ peer->id, ret);
+ goto peer_release;
+ }
+ } else {
+ ovpn_peer_put(peer);
+ }
+
+ return 0;
+
+peer_release:
+ if (new_peer) {
+ /* release right away because peer is not really used in any
+ * context
+ */
+ ovpn_peer_release(peer);
+ kfree(peer);
+ } else {
+ ovpn_peer_put(peer);
+ }
+
+ return ret;
+}
+
+static int ovpn_nl_send_peer(struct sk_buff *skb, const struct genl_info *info,
+ const struct ovpn_peer *peer, u32 portid, u32 seq,
+ int flags)
+{
+ const struct ovpn_bind *bind;
+ struct nlattr *attr;
+ void *hdr;
+
+ hdr = genlmsg_put(skb, portid, seq, &ovpn_nl_family, flags,
+ OVPN_CMD_SET_PEER);
+ if (!hdr)
+ return -ENOBUFS;
+
+ attr = nla_nest_start(skb, OVPN_A_PEER);
+ if (!attr)
+ goto err;
+
+ if (nla_put_u32(skb, OVPN_A_PEER_ID, peer->id))
+ goto err;
+
+ if (peer->vpn_addrs.ipv4.s_addr != htonl(INADDR_ANY))
+ if (nla_put_in_addr(skb, OVPN_A_PEER_VPN_IPV4,
+ peer->vpn_addrs.ipv4.s_addr))
+ goto err;
+
+ if (!ipv6_addr_equal(&peer->vpn_addrs.ipv6, &in6addr_any))
+ if (nla_put_in6_addr(skb, OVPN_A_PEER_VPN_IPV6,
+ &peer->vpn_addrs.ipv6))
+ goto err;
+
+ if (nla_put_u32(skb, OVPN_A_PEER_KEEPALIVE_INTERVAL,
+ peer->keepalive_interval) ||
+ nla_put_u32(skb, OVPN_A_PEER_KEEPALIVE_TIMEOUT,
+ peer->keepalive_timeout))
+ goto err;
+
+ rcu_read_lock();
+ bind = rcu_dereference(peer->bind);
+ if (bind) {
+ if (bind->sa.in4.sin_family == AF_INET) {
+ if (nla_put(skb, OVPN_A_PEER_SOCKADDR_REMOTE,
+ sizeof(bind->sa.in4), &bind->sa.in4) ||
+ nla_put(skb, OVPN_A_PEER_LOCAL_IP,
+ sizeof(bind->local.ipv4),
+ &bind->local.ipv4))
+ goto err_unlock;
+ } else if (bind->sa.in4.sin_family == AF_INET6) {
+ if (nla_put(skb, OVPN_A_PEER_SOCKADDR_REMOTE,
+ sizeof(bind->sa.in6), &bind->sa.in6) ||
+ nla_put(skb, OVPN_A_PEER_LOCAL_IP,
+ sizeof(bind->local.ipv6),
+ &bind->local.ipv6))
+ goto err_unlock;
+ }
+ }
+ rcu_read_unlock();
+
+ if (nla_put_net16(skb, OVPN_A_PEER_LOCAL_PORT,
+ inet_sk(peer->sock->sock->sk)->inet_sport) ||
+ /* VPN RX stats */
+ nla_put_uint(skb, OVPN_A_PEER_VPN_RX_BYTES,
+ atomic64_read(&peer->vpn_stats.rx.bytes)) ||
+ nla_put_uint(skb, OVPN_A_PEER_VPN_RX_PACKETS,
+ atomic64_read(&peer->vpn_stats.rx.packets)) ||
+ /* VPN TX stats */
+ nla_put_uint(skb, OVPN_A_PEER_VPN_TX_BYTES,
+ atomic64_read(&peer->vpn_stats.tx.bytes)) ||
+ nla_put_uint(skb, OVPN_A_PEER_VPN_TX_PACKETS,
+ atomic64_read(&peer->vpn_stats.tx.packets)) ||
+ /* link RX stats */
+ nla_put_uint(skb, OVPN_A_PEER_LINK_RX_BYTES,
+ atomic64_read(&peer->link_stats.rx.bytes)) ||
+ nla_put_uint(skb, OVPN_A_PEER_LINK_RX_PACKETS,
+ atomic64_read(&peer->link_stats.rx.packets)) ||
+ /* link TX stats */
+ nla_put_uint(skb, OVPN_A_PEER_LINK_TX_BYTES,
+ atomic64_read(&peer->link_stats.tx.bytes)) ||
+ nla_put_uint(skb, OVPN_A_PEER_LINK_TX_PACKETS,
+ atomic64_read(&peer->link_stats.tx.packets)))
+ goto err;
+
+ nla_nest_end(skb, attr);
+ genlmsg_end(skb, hdr);
+
+ return 0;
+err_unlock:
+ rcu_read_unlock();
+err:
+ genlmsg_cancel(skb, hdr);
+ return -EMSGSIZE;
}
int ovpn_nl_get_peer_doit(struct sk_buff *skb, struct genl_info *info)
{
- return -EOPNOTSUPP;
+ struct nlattr *attrs[OVPN_A_PEER_MAX + 1];
+ struct ovpn_struct *ovpn = info->user_ptr[0];
+ struct ovpn_peer *peer;
+ struct sk_buff *msg;
+ u32 peer_id;
+ int ret;
+
+ if (GENL_REQ_ATTR_CHECK(info, OVPN_A_PEER))
+ return -EINVAL;
+
+ ret = nla_parse_nested(attrs, OVPN_A_PEER_MAX, info->attrs[OVPN_A_PEER],
+ ovpn_peer_nl_policy, info->extack);
+ if (ret)
+ return ret;
+
+ if (NL_REQ_ATTR_CHECK(info->extack, info->attrs[OVPN_A_PEER], attrs,
+ OVPN_A_PEER_ID))
+ return -EINVAL;
+
+ peer_id = nla_get_u32(attrs[OVPN_A_PEER_ID]);
+ peer = ovpn_peer_get_by_id(ovpn, peer_id);
+ if (!peer) {
+ NL_SET_ERR_MSG_FMT_MOD(info->extack,
+ "cannot find peer with id %u", peer_id);
+ return -ENOENT;
+ }
+
+ msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
+ if (!msg)
+ return -ENOMEM;
+
+ ret = ovpn_nl_send_peer(msg, info, peer, info->snd_portid,
+ info->snd_seq, 0);
+ if (ret < 0) {
+ nlmsg_free(msg);
+ goto err;
+ }
+
+ ret = genlmsg_reply(msg, info);
+err:
+ ovpn_peer_put(peer);
+ return ret;
}
int ovpn_nl_get_peer_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
{
- return -EOPNOTSUPP;
+ const struct genl_info *info = genl_info_dump(cb);
+ struct ovpn_struct *ovpn;
+ struct ovpn_peer *peer;
+ struct net_device *dev;
+ int bkt, last_idx = cb->args[1], dumped = 0;
+
+ dev = ovpn_get_dev_from_attrs(sock_net(cb->skb->sk), info);
+ if (IS_ERR(dev))
+ return PTR_ERR(dev);
+
+ ovpn = netdev_priv(dev);
+
+ if (ovpn->mode == OVPN_MODE_P2P) {
+ /* if we already dumped a peer it means we are done */
+ if (last_idx)
+ goto out;
+
+ rcu_read_lock();
+ peer = rcu_dereference(ovpn->peer);
+ if (peer) {
+ if (ovpn_nl_send_peer(skb, info, peer,
+ NETLINK_CB(cb->skb).portid,
+ cb->nlh->nlmsg_seq,
+ NLM_F_MULTI) == 0)
+ dumped++;
+ }
+ rcu_read_unlock();
+ } else {
+ rcu_read_lock();
+ hash_for_each_rcu(ovpn->peers->by_id, bkt, peer,
+ hash_entry_id) {
+ /* skip already dumped peers that were dumped by
+ * previous invocations
+ */
+ if (last_idx > 0) {
+ last_idx--;
+ continue;
+ }
+
+ if (ovpn_nl_send_peer(skb, info, peer,
+ NETLINK_CB(cb->skb).portid,
+ cb->nlh->nlmsg_seq,
+ NLM_F_MULTI) < 0)
+ break;
+
+ /* count peers being dumped during this invocation */
+ dumped++;
+ }
+ rcu_read_unlock();
+ }
+
+out:
+ netdev_put(dev, NULL);
+
+ /* sum up peers dumped in this message, so that at the next invocation
+ * we can continue from where we left
+ */
+ cb->args[1] += dumped;
+ return skb->len;
}
int ovpn_nl_del_peer_doit(struct sk_buff *skb, struct genl_info *info)
{
- return -EOPNOTSUPP;
+ struct nlattr *attrs[OVPN_A_PEER_MAX + 1];
+ struct ovpn_struct *ovpn = info->user_ptr[0];
+ struct ovpn_peer *peer;
+ u32 peer_id;
+ int ret;
+
+ if (GENL_REQ_ATTR_CHECK(info, OVPN_A_PEER))
+ return -EINVAL;
+
+ ret = nla_parse_nested(attrs, OVPN_A_PEER_MAX, info->attrs[OVPN_A_PEER],
+ ovpn_peer_nl_policy, info->extack);
+ if (ret)
+ return ret;
+
+ if (NL_REQ_ATTR_CHECK(info->extack, info->attrs[OVPN_A_PEER], attrs,
+ OVPN_A_PEER_ID))
+ return -EINVAL;
+
+ peer_id = nla_get_u32(attrs[OVPN_A_PEER_ID]);
+
+ peer = ovpn_peer_get_by_id(ovpn, peer_id);
+ if (!peer)
+ return -ENOENT;
+
+ netdev_dbg(ovpn->dev, "%s: peer id=%u\n", __func__, peer->id);
+ ret = ovpn_peer_del(peer, OVPN_DEL_PEER_REASON_USERSPACE);
+ ovpn_peer_put(peer);
+
+ return ret;
}
int ovpn_nl_set_key_doit(struct sk_buff *skb, struct genl_info *info)
diff --git a/drivers/net/ovpn/peer.c b/drivers/net/ovpn/peer.c
index c07d148c52b4..2105bcc981fa 100644
--- a/drivers/net/ovpn/peer.c
+++ b/drivers/net/ovpn/peer.c
@@ -134,9 +134,9 @@ struct ovpn_peer *ovpn_peer_new(struct ovpn_struct *ovpn, u32 id)
*
* Return: 0 on success or a negative error code otherwise
*/
-static int ovpn_peer_reset_sockaddr(struct ovpn_peer *peer,
- const struct sockaddr_storage *ss,
- const u8 *local_ip)
+int ovpn_peer_reset_sockaddr(struct ovpn_peer *peer,
+ const struct sockaddr_storage *ss,
+ const u8 *local_ip)
{
struct ovpn_bind *bind;
size_t ip_len;
@@ -251,7 +251,7 @@ static void ovpn_peer_timer_delete_all(struct ovpn_peer *peer)
* ovpn_peer_release - release peer private members
* @peer: the peer to release
*/
-static void ovpn_peer_release(struct ovpn_peer *peer)
+void ovpn_peer_release(struct ovpn_peer *peer)
{
if (peer->sock)
ovpn_socket_put(peer->sock);
diff --git a/drivers/net/ovpn/peer.h b/drivers/net/ovpn/peer.h
index 691cf20bd870..8d24a8fdd03e 100644
--- a/drivers/net/ovpn/peer.h
+++ b/drivers/net/ovpn/peer.h
@@ -127,6 +127,7 @@ static inline bool ovpn_peer_hold(struct ovpn_peer *peer)
return kref_get_unless_zero(&peer->refcount);
}
+void ovpn_peer_release(struct ovpn_peer *peer);
void ovpn_peer_release_kref(struct kref *kref);
/**
@@ -193,5 +194,8 @@ void ovpn_peer_update_local_endpoint(struct ovpn_peer *peer,
struct sk_buff *skb);
void ovpn_peer_float(struct ovpn_peer *peer, struct sk_buff *skb);
+int ovpn_peer_reset_sockaddr(struct ovpn_peer *peer,
+ const struct sockaddr_storage *ss,
+ const u8 *local_ip);
#endif /* _NET_OVPN_OVPNPEER_H_ */
--
2.44.2
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