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Message-Id: <20241211-b4-ovpn-v15-7-314e2cad0618@openvpn.net>
Date: Wed, 11 Dec 2024 22:15:11 +0100
From: Antonio Quartulli <antonio@...nvpn.net>
To: netdev@...r.kernel.org, Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
Donald Hunter <donald.hunter@...il.com>,
Antonio Quartulli <antonio@...nvpn.net>, Shuah Khan <shuah@...nel.org>,
sd@...asysnail.net, ryazanov.s.a@...il.com,
Andrew Lunn <andrew+netdev@...n.ch>
Cc: Simon Horman <horms@...nel.org>, linux-kernel@...r.kernel.org,
linux-kselftest@...r.kernel.org, Xiao Liang <shaw.leon@...il.com>
Subject: [PATCH net-next v15 07/22] ovpn: implement basic TX path (UDP)
Packets sent over the ovpn interface are processed and transmitted to the
connected peer, if any.
Implementation is UDP only. TCP will be added by a later patch.
Note: no crypto/encapsulation exists yet. Packets are just captured and
sent.
Signed-off-by: Antonio Quartulli <antonio@...nvpn.net>
---
drivers/net/Kconfig | 1 +
drivers/net/ovpn/io.c | 129 +++++++++++++++++++++++++-
drivers/net/ovpn/peer.c | 35 ++++++++
drivers/net/ovpn/peer.h | 4 +
drivers/net/ovpn/skb.h | 55 ++++++++++++
drivers/net/ovpn/udp.c | 234 ++++++++++++++++++++++++++++++++++++++++++++++++
drivers/net/ovpn/udp.h | 5 ++
7 files changed, 462 insertions(+), 1 deletion(-)
diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index d6c1810f042e222143f53563a8d8df4bc9df27ed..f4f985fc003373ddc14dc18f8b3f73295a3ae0a6 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -119,6 +119,7 @@ config OVPN
tristate "OpenVPN data channel offload"
depends on NET && INET
select DST_CACHE
+ select NET_UDP_TUNNEL
help
This module enhances the performance of the OpenVPN userspace software
by offloading the data channel processing to kernelspace.
diff --git a/drivers/net/ovpn/io.c b/drivers/net/ovpn/io.c
index ad3813419c33cbdfe7e8ad6f5c8b444a3540a69f..2a3dbc723813a14070159318097755cc7ea3f216 100644
--- a/drivers/net/ovpn/io.c
+++ b/drivers/net/ovpn/io.c
@@ -9,14 +9,141 @@
#include <linux/netdevice.h>
#include <linux/skbuff.h>
+#include <net/gso.h>
#include "io.h"
+#include "ovpnstruct.h"
+#include "peer.h"
+#include "udp.h"
+#include "skb.h"
+#include "socket.h"
+
+static void ovpn_encrypt_post(struct sk_buff *skb, int ret)
+{
+ struct ovpn_peer *peer = ovpn_skb_cb(skb)->peer;
+
+ if (unlikely(ret < 0))
+ goto err;
+
+ skb_mark_not_on_list(skb);
+
+ switch (peer->sock->sock->sk->sk_protocol) {
+ case IPPROTO_UDP:
+ ovpn_udp_send_skb(peer, skb);
+ break;
+ default:
+ /* no transport configured yet */
+ goto err;
+ }
+ /* skb passed down the stack - don't free it */
+ skb = NULL;
+err:
+ if (unlikely(skb))
+ dev_core_stats_tx_dropped_inc(peer->ovpn->dev);
+ ovpn_peer_put(peer);
+ kfree_skb(skb);
+}
+
+static bool ovpn_encrypt_one(struct ovpn_peer *peer, struct sk_buff *skb)
+{
+ ovpn_skb_cb(skb)->peer = peer;
+
+ /* take a reference to the peer because the crypto code may run async.
+ * ovpn_encrypt_post() will release it upon completion
+ */
+ if (unlikely(!ovpn_peer_hold(peer))) {
+ DEBUG_NET_WARN_ON_ONCE(1);
+ return false;
+ }
+
+ ovpn_encrypt_post(skb, 0);
+ return true;
+}
+
+/* send skb to connected peer, if any */
+static void ovpn_send(struct ovpn_priv *ovpn, struct sk_buff *skb,
+ struct ovpn_peer *peer)
+{
+ struct sk_buff *curr, *next;
+
+ /* this might be a GSO-segmented skb list: process each skb
+ * independently
+ */
+ skb_list_walk_safe(skb, curr, next) {
+ if (unlikely(!ovpn_encrypt_one(peer, curr))) {
+ dev_core_stats_tx_dropped_inc(ovpn->dev);
+ kfree_skb(curr);
+ }
+ }
+
+ ovpn_peer_put(peer);
+}
/* Send user data to the network
*/
netdev_tx_t ovpn_net_xmit(struct sk_buff *skb, struct net_device *dev)
{
+ struct ovpn_priv *ovpn = netdev_priv(dev);
+ struct sk_buff *segments, *curr, *next;
+ struct sk_buff_head skb_list;
+ struct ovpn_peer *peer;
+ __be16 proto;
+ int ret;
+
+ /* reset netfilter state */
+ nf_reset_ct(skb);
+
+ /* verify IP header size in network packet */
+ proto = ovpn_ip_check_protocol(skb);
+ if (unlikely(!proto || skb->protocol != proto))
+ goto drop;
+
+ if (skb_is_gso(skb)) {
+ segments = skb_gso_segment(skb, 0);
+ if (IS_ERR(segments)) {
+ ret = PTR_ERR(segments);
+ net_err_ratelimited("%s: cannot segment payload packet: %d\n",
+ netdev_name(dev), ret);
+ goto drop;
+ }
+
+ consume_skb(skb);
+ skb = segments;
+ }
+
+ /* from this moment on, "skb" might be a list */
+
+ __skb_queue_head_init(&skb_list);
+ skb_list_walk_safe(skb, curr, next) {
+ skb_mark_not_on_list(curr);
+
+ curr = skb_share_check(curr, GFP_ATOMIC);
+ if (unlikely(!curr)) {
+ net_err_ratelimited("%s: skb_share_check failed for payload packet\n",
+ netdev_name(dev));
+ dev_core_stats_tx_dropped_inc(ovpn->dev);
+ continue;
+ }
+
+ __skb_queue_tail(&skb_list, curr);
+ }
+ skb_list.prev->next = NULL;
+
+ /* retrieve peer serving the destination IP of this packet */
+ peer = ovpn_peer_get_by_dst(ovpn, skb);
+ if (unlikely(!peer)) {
+ net_dbg_ratelimited("%s: no peer to send data to\n",
+ netdev_name(ovpn->dev));
+ goto drop;
+ }
+
+ ovpn_send(ovpn, skb_list.next, peer);
+
+ return NETDEV_TX_OK;
+
+drop:
+ dev_core_stats_tx_dropped_inc(ovpn->dev);
skb_tx_error(skb);
- kfree_skb(skb);
+ kfree_skb_list(skb);
return NET_XMIT_DROP;
}
diff --git a/drivers/net/ovpn/peer.c b/drivers/net/ovpn/peer.c
index 427276dd910f4658dd0bfb272b13631976df622d..d89c82aae2c7646f8c40cdde5bfe364c8b46c659 100644
--- a/drivers/net/ovpn/peer.c
+++ b/drivers/net/ovpn/peer.c
@@ -16,6 +16,7 @@
#include "main.h"
#include "netlink.h"
#include "peer.h"
+#include "socket.h"
/**
* ovpn_peer_new - allocate and initialize a new peer object
@@ -253,6 +254,38 @@ struct ovpn_peer *ovpn_peer_get_by_id(struct ovpn_priv *ovpn, u32 peer_id)
return peer;
}
+/**
+ * ovpn_peer_get_by_dst - Lookup peer to send skb to
+ * @ovpn: the private data representing the current VPN session
+ * @skb: the skb to extract the destination address from
+ *
+ * This function takes a tunnel packet and looks up the peer to send it to
+ * after encapsulation. The skb is expected to be the in-tunnel packet, without
+ * any OpenVPN related header.
+ *
+ * Assume that the IP header is accessible in the skb data.
+ *
+ * Return: the peer if found or NULL otherwise.
+ */
+struct ovpn_peer *ovpn_peer_get_by_dst(struct ovpn_priv *ovpn,
+ struct sk_buff *skb)
+{
+ struct ovpn_peer *peer = NULL;
+
+ /* in P2P mode, no matter the destination, packets are always sent to
+ * the single peer listening on the other side
+ */
+ if (ovpn->mode == OVPN_MODE_P2P) {
+ rcu_read_lock();
+ peer = rcu_dereference(ovpn->peer);
+ if (unlikely(peer && !ovpn_peer_hold(peer)))
+ peer = NULL;
+ rcu_read_unlock();
+ }
+
+ return peer;
+}
+
/**
* ovpn_peer_add_p2p - add peer to related tables in a P2P instance
* @ovpn: the instance to add the peer to
@@ -318,6 +351,8 @@ static void ovpn_peer_remove(struct ovpn_peer *peer,
}
peer->delete_reason = reason;
+ if (peer->sock)
+ ovpn_socket_put(peer->sock);
/* reference from ovpn->peer or hashtable dropped */
ovpn_peer_put(peer);
diff --git a/drivers/net/ovpn/peer.h b/drivers/net/ovpn/peer.h
index c3458732b2cfcd439644423ec8cd77595f9ed5f3..24de7a69e371a521bed48a8ef3116350ea3e9560 100644
--- a/drivers/net/ovpn/peer.h
+++ b/drivers/net/ovpn/peer.h
@@ -19,6 +19,7 @@
* @vpn_addrs: IP addresses assigned over the tunnel
* @vpn_addrs.ipv4: IPv4 assigned to peer on the tunnel
* @vpn_addrs.ipv6: IPv6 assigned to peer on the tunnel
+ * @sock: the socket being used to talk to this peer
* @dst_cache: cache for dst_entry used to send to peer
* @bind: remote peer binding
* @delete_reason: why peer was deleted (i.e. timeout, transport error, ..)
@@ -34,6 +35,7 @@ struct ovpn_peer {
struct in_addr ipv4;
struct in6_addr ipv6;
} vpn_addrs;
+ struct ovpn_socket *sock;
struct dst_cache dst_cache;
struct ovpn_bind __rcu *bind;
enum ovpn_del_peer_reason delete_reason;
@@ -74,5 +76,7 @@ void ovpn_peer_release_p2p(struct ovpn_priv *ovpn,
struct ovpn_peer *ovpn_peer_get_by_transp_addr(struct ovpn_priv *ovpn,
struct sk_buff *skb);
struct ovpn_peer *ovpn_peer_get_by_id(struct ovpn_priv *ovpn, u32 peer_id);
+struct ovpn_peer *ovpn_peer_get_by_dst(struct ovpn_priv *ovpn,
+ struct sk_buff *skb);
#endif /* _NET_OVPN_OVPNPEER_H_ */
diff --git a/drivers/net/ovpn/skb.h b/drivers/net/ovpn/skb.h
new file mode 100644
index 0000000000000000000000000000000000000000..af7b1f5b0ee6033ce980978667c3ee99a90e1d1b
--- /dev/null
+++ b/drivers/net/ovpn/skb.h
@@ -0,0 +1,55 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/* OpenVPN data channel offload
+ *
+ * Copyright (C) 2020-2024 OpenVPN, Inc.
+ *
+ * Author: Antonio Quartulli <antonio@...nvpn.net>
+ * James Yonan <james@...nvpn.net>
+ */
+
+#ifndef _NET_OVPN_SKB_H_
+#define _NET_OVPN_SKB_H_
+
+#include <linux/in.h>
+#include <linux/in6.h>
+#include <linux/ip.h>
+#include <linux/ipv6.h>
+#include <linux/skbuff.h>
+#include <linux/socket.h>
+#include <linux/types.h>
+
+struct ovpn_cb {
+ struct ovpn_peer *peer;
+};
+
+static inline struct ovpn_cb *ovpn_skb_cb(struct sk_buff *skb)
+{
+ BUILD_BUG_ON(sizeof(struct ovpn_cb) > sizeof(skb->cb));
+ return (struct ovpn_cb *)skb->cb;
+}
+
+/* Return IP protocol version from skb header.
+ * Return 0 if protocol is not IPv4/IPv6 or cannot be read.
+ */
+static inline __be16 ovpn_ip_check_protocol(struct sk_buff *skb)
+{
+ __be16 proto = 0;
+
+ /* skb could be non-linear,
+ * make sure IP header is in non-fragmented part
+ */
+ if (!pskb_network_may_pull(skb, sizeof(struct iphdr)))
+ return 0;
+
+ if (ip_hdr(skb)->version == 4) {
+ proto = htons(ETH_P_IP);
+ } else if (ip_hdr(skb)->version == 6) {
+ if (!pskb_network_may_pull(skb, sizeof(struct ipv6hdr)))
+ return 0;
+ proto = htons(ETH_P_IPV6);
+ }
+
+ return proto;
+}
+
+#endif /* _NET_OVPN_SKB_H_ */
diff --git a/drivers/net/ovpn/udp.c b/drivers/net/ovpn/udp.c
index c00e07f148d72ff737e732028fd73f82a507fb57..c0e7aa289ad3345fcd91e7c890f70961300c356f 100644
--- a/drivers/net/ovpn/udp.c
+++ b/drivers/net/ovpn/udp.c
@@ -7,15 +7,249 @@
*/
#include <linux/netdevice.h>
+#include <linux/inetdevice.h>
+#include <linux/skbuff.h>
#include <linux/socket.h>
#include <linux/udp.h>
+#include <net/addrconf.h>
+#include <net/dst_cache.h>
+#include <net/route.h>
+#include <net/ipv6_stubs.h>
#include <net/udp.h>
+#include <net/udp_tunnel.h>
#include "ovpnstruct.h"
#include "main.h"
+#include "bind.h"
+#include "io.h"
+#include "peer.h"
#include "socket.h"
#include "udp.h"
+/**
+ * ovpn_udp4_output - send IPv4 packet over udp socket
+ * @peer: the destination peer
+ * @bind: the binding related to the destination peer
+ * @cache: dst cache
+ * @sk: the socket to send the packet over
+ * @skb: the packet to send
+ *
+ * Return: 0 on success or a negative error code otherwise
+ */
+static int ovpn_udp4_output(struct ovpn_peer *peer, struct ovpn_bind *bind,
+ struct dst_cache *cache, struct sock *sk,
+ struct sk_buff *skb)
+{
+ struct rtable *rt;
+ struct flowi4 fl = {
+ .saddr = bind->local.ipv4.s_addr,
+ .daddr = bind->remote.in4.sin_addr.s_addr,
+ .fl4_sport = inet_sk(sk)->inet_sport,
+ .fl4_dport = bind->remote.in4.sin_port,
+ .flowi4_proto = sk->sk_protocol,
+ .flowi4_mark = sk->sk_mark,
+ };
+ int ret;
+
+ local_bh_disable();
+ rt = dst_cache_get_ip4(cache, &fl.saddr);
+ if (rt)
+ goto transmit;
+
+ if (unlikely(!inet_confirm_addr(sock_net(sk), NULL, 0, fl.saddr,
+ RT_SCOPE_HOST))) {
+ /* we may end up here when the cached address is not usable
+ * anymore. In this case we reset address/cache and perform a
+ * new look up
+ */
+ fl.saddr = 0;
+ spin_lock_bh(&peer->lock);
+ bind->local.ipv4.s_addr = 0;
+ spin_unlock_bh(&peer->lock);
+ dst_cache_reset(cache);
+ }
+
+ rt = ip_route_output_flow(sock_net(sk), &fl, sk);
+ if (IS_ERR(rt) && PTR_ERR(rt) == -EINVAL) {
+ fl.saddr = 0;
+ spin_lock_bh(&peer->lock);
+ bind->local.ipv4.s_addr = 0;
+ spin_unlock_bh(&peer->lock);
+ dst_cache_reset(cache);
+
+ rt = ip_route_output_flow(sock_net(sk), &fl, sk);
+ }
+
+ if (IS_ERR(rt)) {
+ ret = PTR_ERR(rt);
+ net_dbg_ratelimited("%s: no route to host %pISpc: %d\n",
+ netdev_name(peer->ovpn->dev),
+ &bind->remote.in4,
+ ret);
+ goto err;
+ }
+ dst_cache_set_ip4(cache, &rt->dst, fl.saddr);
+
+transmit:
+ udp_tunnel_xmit_skb(rt, sk, skb, fl.saddr, fl.daddr, 0,
+ ip4_dst_hoplimit(&rt->dst), 0, fl.fl4_sport,
+ fl.fl4_dport, false, sk->sk_no_check_tx);
+ ret = 0;
+err:
+ local_bh_enable();
+ return ret;
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+/**
+ * ovpn_udp6_output - send IPv6 packet over udp socket
+ * @peer: the destination peer
+ * @bind: the binding related to the destination peer
+ * @cache: dst cache
+ * @sk: the socket to send the packet over
+ * @skb: the packet to send
+ *
+ * Return: 0 on success or a negative error code otherwise
+ */
+static int ovpn_udp6_output(struct ovpn_peer *peer, struct ovpn_bind *bind,
+ struct dst_cache *cache, struct sock *sk,
+ struct sk_buff *skb)
+{
+ struct dst_entry *dst;
+ int ret;
+
+ struct flowi6 fl = {
+ .saddr = bind->local.ipv6,
+ .daddr = bind->remote.in6.sin6_addr,
+ .fl6_sport = inet_sk(sk)->inet_sport,
+ .fl6_dport = bind->remote.in6.sin6_port,
+ .flowi6_proto = sk->sk_protocol,
+ .flowi6_mark = sk->sk_mark,
+ .flowi6_oif = bind->remote.in6.sin6_scope_id,
+ };
+
+ local_bh_disable();
+ dst = dst_cache_get_ip6(cache, &fl.saddr);
+ if (dst)
+ goto transmit;
+
+ if (unlikely(!ipv6_chk_addr(sock_net(sk), &fl.saddr, NULL, 0))) {
+ /* we may end up here when the cached address is not usable
+ * anymore. In this case we reset address/cache and perform a
+ * new look up
+ */
+ fl.saddr = in6addr_any;
+ spin_lock_bh(&peer->lock);
+ bind->local.ipv6 = in6addr_any;
+ spin_unlock_bh(&peer->lock);
+ dst_cache_reset(cache);
+ }
+
+ dst = ipv6_stub->ipv6_dst_lookup_flow(sock_net(sk), sk, &fl, NULL);
+ if (IS_ERR(dst)) {
+ ret = PTR_ERR(dst);
+ net_dbg_ratelimited("%s: no route to host %pISpc: %d\n",
+ netdev_name(peer->ovpn->dev),
+ &bind->remote.in6, ret);
+ goto err;
+ }
+ dst_cache_set_ip6(cache, dst, &fl.saddr);
+
+transmit:
+ udp_tunnel6_xmit_skb(dst, sk, skb, skb->dev, &fl.saddr, &fl.daddr, 0,
+ ip6_dst_hoplimit(dst), 0, fl.fl6_sport,
+ fl.fl6_dport, udp_get_no_check6_tx(sk));
+ ret = 0;
+err:
+ local_bh_enable();
+ return ret;
+}
+#endif
+
+/**
+ * ovpn_udp_output - transmit skb using udp-tunnel
+ * @peer: the destination peer
+ * @cache: dst cache
+ * @sk: the socket to send the packet over
+ * @skb: the packet to send
+ *
+ * rcu_read_lock should be held on entry.
+ * On return, the skb is consumed.
+ *
+ * Return: 0 on success or a negative error code otherwise
+ */
+static int ovpn_udp_output(struct ovpn_peer *peer, struct dst_cache *cache,
+ struct sock *sk, struct sk_buff *skb)
+{
+ struct ovpn_bind *bind;
+ int ret;
+
+ /* set sk to null if skb is already orphaned */
+ if (!skb->destructor)
+ skb->sk = NULL;
+
+ /* always permit openvpn-created packets to be (outside) fragmented */
+ skb->ignore_df = 1;
+
+ rcu_read_lock();
+ bind = rcu_dereference(peer->bind);
+ if (unlikely(!bind)) {
+ net_warn_ratelimited("%s: no bind for remote peer %u\n",
+ netdev_name(peer->ovpn->dev), peer->id);
+ ret = -ENODEV;
+ goto out;
+ }
+
+ switch (bind->remote.in4.sin_family) {
+ case AF_INET:
+ ret = ovpn_udp4_output(peer, bind, cache, sk, skb);
+ break;
+#if IS_ENABLED(CONFIG_IPV6)
+ case AF_INET6:
+ ret = ovpn_udp6_output(peer, bind, cache, sk, skb);
+ break;
+#endif
+ default:
+ ret = -EAFNOSUPPORT;
+ break;
+ }
+
+out:
+ rcu_read_unlock();
+ return ret;
+}
+
+/**
+ * ovpn_udp_send_skb - prepare skb and send it over via UDP
+ * @peer: the destination peer
+ * @skb: the packet to send
+ */
+void ovpn_udp_send_skb(struct ovpn_peer *peer, struct sk_buff *skb)
+{
+ struct socket *sock;
+ int ret = -1;
+
+ skb->dev = peer->ovpn->dev;
+ /* no checksum performed at this layer */
+ skb->ip_summed = CHECKSUM_NONE;
+
+ /* get socket info */
+ sock = peer->sock->sock;
+ if (unlikely(!sock)) {
+ net_warn_ratelimited("%s: no sock for remote peer %u\n",
+ netdev_name(peer->ovpn->dev), peer->id);
+ goto out;
+ }
+
+ /* crypto layer -> transport (UDP) */
+ ret = ovpn_udp_output(peer, &peer->dst_cache, sock->sk, skb);
+out:
+ if (unlikely(ret < 0)) {
+ kfree_skb(skb);
+ return;
+ }
+}
+
/**
* ovpn_udp_socket_attach - set udp-tunnel CBs on socket and link it to ovpn
* @sock: socket to configure
diff --git a/drivers/net/ovpn/udp.h b/drivers/net/ovpn/udp.h
index 3c48a06f15eed624aec0a2a7b871f0e7f3004137..44ebeb82325dc4d172da7e29fb36f21a5609ea8d 100644
--- a/drivers/net/ovpn/udp.h
+++ b/drivers/net/ovpn/udp.h
@@ -9,9 +9,14 @@
#ifndef _NET_OVPN_UDP_H_
#define _NET_OVPN_UDP_H_
+#include <net/sock.h>
+
+struct ovpn_peer;
struct ovpn_priv;
struct socket;
int ovpn_udp_socket_attach(struct socket *sock, struct ovpn_priv *ovpn);
+void ovpn_udp_send_skb(struct ovpn_peer *peer, struct sk_buff *skb);
+
#endif /* _NET_OVPN_UDP_H_ */
--
2.45.2
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