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Mon, 09 Dec 2024 00:53:13 -0800 (PST) From: Antonio Quartulli Date: Mon, 09 Dec 2024 09:53:21 +0100 Subject: [PATCH net-next v14 12/22] ovpn: implement multi-peer support Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20241209-b4-ovpn-v14-12-ea243cf16417@openvpn.net> References: <20241209-b4-ovpn-v14-0-ea243cf16417@openvpn.net> In-Reply-To: <20241209-b4-ovpn-v14-0-ea243cf16417@openvpn.net> To: netdev@vger.kernel.org, Eric Dumazet , Jakub Kicinski , Paolo Abeni , Donald Hunter , Antonio Quartulli , Shuah Khan , sd@queasysnail.net, ryazanov.s.a@gmail.com, Andrew Lunn Cc: Simon Horman , linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=13690; i=antonio@openvpn.net; h=from:subject:message-id; bh=AWOm63BdDr8FGAbpO5LRIq7nTRyofOSHoB/hgLkaMqs=; b=owEBbQGS/pANAwAIAQtw5TqgONWHAcsmYgBnVrATgZBhbED9qggdd9F7mHxG1XOTqwigwvFTA 9Uoog9pmL6JATMEAAEIAB0WIQSZq9xs+NQS5N5fwPwLcOU6oDjVhwUCZ1awEwAKCRALcOU6oDjV h5XIB/4kKQzrprlgO0YZjuVmAnGfzHMS3Jy2U2j+8uq4YHjLUzLVadH4YjJRIM+lJ/RmLOBrMt/ K3MLczdOyJtOeFc+zkPfAc70/H9OWL7a47SB9JbPvmwb0WpPAhotIxHlyYG5OkjV62uvdYTy3PE J2qP+um0haqoLzTOprGRheMdkXsZde+LFB+kqZoNyxTk6l6hBOM7f/hCTT0/GKwtV3+1deOGDK6 JZXM8SscLqcuEFCdSdKR4yN8pOhJHTuluSAG2DIThO3XN4esWB14wNVIVh2sPAQBSDbKsgLjusS AHU8T335Cy0xrT3Hjk2VBtWu2O4hRb6e/x7R1PbnIbftjkVE X-Developer-Key: i=antonio@openvpn.net; a=openpgp; fpr=CABDA1282017C267219885C748F0CCB68F59D14C With this change an ovpn instance will be able to stay connected to multiple remote endpoints. This functionality is strictly required when running ovpn on an OpenVPN server. Signed-off-by: Antonio Quartulli --- drivers/net/ovpn/main.c | 67 ++++++++++++++++- drivers/net/ovpn/ovpnstruct.h | 16 ++++ drivers/net/ovpn/peer.c | 166 ++++++++++++++++++++++++++++++++++++++= ++-- drivers/net/ovpn/peer.h | 9 +++ 4 files changed, 249 insertions(+), 9 deletions(-) diff --git a/drivers/net/ovpn/main.c b/drivers/net/ovpn/main.c index b09e98080737cbb6c446d00cfaad6d2e0c716327..bd0d791cf9ccad7563f89e96b9c= 443d52b34e8bf 100644 --- a/drivers/net/ovpn/main.c +++ b/drivers/net/ovpn/main.c @@ -24,6 +24,13 @@ #include "proto.h" #include "tcp.h" =20 +static void ovpn_priv_free(struct net_device *net) +{ + struct ovpn_priv *ovpn =3D netdev_priv(net); + + kfree(ovpn->peers); +} + static int ovpn_net_init(struct net_device *dev) { struct ovpn_priv *ovpn =3D netdev_priv(dev); @@ -99,6 +106,8 @@ static void ovpn_setup(struct net_device *dev) =20 dev->netdev_ops =3D &ovpn_netdev_ops; =20 + dev->priv_destructor =3D ovpn_priv_free; + dev->hard_header_len =3D 0; dev->addr_len =3D 0; dev->mtu =3D ETH_DATA_LEN - OVPN_HEAD_ROOM; @@ -120,12 +129,50 @@ static void ovpn_setup(struct net_device *dev) SET_NETDEV_DEVTYPE(dev, &ovpn_type); } =20 +static int ovpn_mp_alloc(struct ovpn_priv *ovpn) +{ + struct in_device *dev_v4; + int i; + + if (ovpn->mode !=3D OVPN_MODE_MP) + return 0; + + dev_v4 =3D __in_dev_get_rtnl(ovpn->dev); + if (dev_v4) { + /* disable redirects as Linux gets confused by ovpn + * handling same-LAN routing. + * This happens because a multipeer interface is used as + * relay point between hosts in the same subnet, while + * in a classic LAN this would not be needed because the + * two hosts would be able to talk directly. + */ + IN_DEV_CONF_SET(dev_v4, SEND_REDIRECTS, false); + IPV4_DEVCONF_ALL(dev_net(ovpn->dev), SEND_REDIRECTS) =3D false; + } + + /* the peer container is fairly large, therefore we allocate it only in + * MP mode + */ + ovpn->peers =3D kzalloc(sizeof(*ovpn->peers), GFP_KERNEL); + if (!ovpn->peers) + return -ENOMEM; + + for (i =3D 0; i < ARRAY_SIZE(ovpn->peers->by_id); i++) { + INIT_HLIST_HEAD(&ovpn->peers->by_id[i]); + INIT_HLIST_NULLS_HEAD(&ovpn->peers->by_vpn_addr[i], i); + INIT_HLIST_NULLS_HEAD(&ovpn->peers->by_transp_addr[i], i); + } + + return 0; +} + static int ovpn_newlink(struct net *src_net, struct net_device *dev, struct nlattr *tb[], struct nlattr *data[], struct netlink_ext_ack *extack) { struct ovpn_priv *ovpn =3D netdev_priv(dev); enum ovpn_mode mode =3D OVPN_MODE_P2P; + int err; =20 if (data && data[IFLA_OVPN_MODE]) { mode =3D nla_get_u8(data[IFLA_OVPN_MODE]); @@ -136,6 +183,10 @@ static int ovpn_newlink(struct net *src_net, struct ne= t_device *dev, ovpn->mode =3D mode; spin_lock_init(&ovpn->lock); =20 + err =3D ovpn_mp_alloc(ovpn); + if (err < 0) + return err; + /* turn carrier explicitly off after registration, this way state is * clearly defined */ @@ -184,14 +235,26 @@ static int ovpn_netdev_notifier_call(struct notifier_= block *nb, netif_carrier_off(dev); ovpn->registered =3D false; =20 - if (ovpn->mode =3D=3D OVPN_MODE_P2P) + switch (ovpn->mode) { + case OVPN_MODE_P2P: ovpn_peer_release_p2p(ovpn, OVPN_DEL_PEER_REASON_TEARDOWN); + break; + case OVPN_MODE_MP: + ovpn_peers_free(ovpn, OVPN_DEL_PEER_REASON_TEARDOWN); + break; + } break; case NETDEV_DOWN: - if (ovpn->mode =3D=3D OVPN_MODE_P2P) + switch (ovpn->mode) { + case OVPN_MODE_P2P: ovpn_peer_release_p2p(ovpn, OVPN_DEL_PEER_REASON_ADMINDOWN); + break; + case OVPN_MODE_MP: + ovpn_peers_free(ovpn, OVPN_DEL_PEER_REASON_ADMINDOWN); + break; + } break; case NETDEV_POST_INIT: case NETDEV_GOING_DOWN: diff --git a/drivers/net/ovpn/ovpnstruct.h b/drivers/net/ovpn/ovpnstruct.h index 7af1f21bb5a76acb34269693bcba5ce8f832137f..bca13e8e4439c2f217ae17896f1= 14347e8aefd06 100644 --- a/drivers/net/ovpn/ovpnstruct.h +++ b/drivers/net/ovpn/ovpnstruct.h @@ -16,6 +16,20 @@ #include #include =20 +/** + * struct ovpn_peer_collection - container of peers for MultiPeer mode + * @by_id: table of peers index by ID + * @by_vpn_addr: table of peers indexed by VPN IP address (items can be + * rehashed on the fly due to peer IP change) + * @by_transp_addr: table of peers indexed by transport address (items can= be + * rehashed on the fly due to peer IP change) + */ +struct ovpn_peer_collection { + DECLARE_HASHTABLE(by_id, 12); + struct hlist_nulls_head by_vpn_addr[1 << 12]; + struct hlist_nulls_head by_transp_addr[1 << 12]; +}; + /** * struct ovpn_priv - per ovpn interface state * @dev: the actual netdev representing the tunnel @@ -23,6 +37,7 @@ * @registered: whether dev is still registered with netdev or not * @mode: device operation mode (i.e. p2p, mp, ..) * @lock: protect this object + * @peers: data structures holding multi-peer references * @peer: in P2P mode, this is the only remote peer * @gro_cells: pointer to the Generic Receive Offload cell */ @@ -32,6 +47,7 @@ struct ovpn_priv { bool registered; enum ovpn_mode mode; spinlock_t lock; /* protect writing to the ovpn_priv object */ + struct ovpn_peer_collection *peers; struct ovpn_peer __rcu *peer; struct gro_cells gro_cells; }; diff --git a/drivers/net/ovpn/peer.c b/drivers/net/ovpn/peer.c index 0d625f065255c4947a18ae475b04c27f0cf6bb32..9f213ccacfaf8170b9c23730498= f156360774d7e 100644 --- a/drivers/net/ovpn/peer.c +++ b/drivers/net/ovpn/peer.c @@ -9,6 +9,7 @@ =20 #include #include +#include =20 #include "ovpnstruct.h" #include "bind.h" @@ -317,6 +318,89 @@ bool ovpn_peer_check_by_src(struct ovpn_priv *ovpn, st= ruct sk_buff *skb, return match; } =20 +#define ovpn_get_hash_head(_tbl, _key, _key_len) ({ \ + typeof(_tbl) *__tbl =3D &(_tbl); \ + (&(*__tbl)[jhash(_key, _key_len, 0) % HASH_SIZE(*__tbl)]); }) \ + +/** + * ovpn_peer_add_mp - add peer to related tables in a MP instance + * @ovpn: the instance to add the peer to + * @peer: the peer to add + * + * Return: 0 on success or a negative error code otherwise + */ +static int ovpn_peer_add_mp(struct ovpn_priv *ovpn, struct ovpn_peer *peer) +{ + struct sockaddr_storage sa =3D { 0 }; + struct hlist_nulls_head *nhead; + struct sockaddr_in6 *sa6; + struct sockaddr_in *sa4; + struct ovpn_bind *bind; + struct ovpn_peer *tmp; + size_t salen; + int ret =3D 0; + + spin_lock_bh(&ovpn->lock); + /* do not add duplicates */ + tmp =3D ovpn_peer_get_by_id(ovpn, peer->id); + if (tmp) { + ovpn_peer_put(tmp); + ret =3D -EEXIST; + goto out; + } + + bind =3D rcu_dereference_protected(peer->bind, true); + /* peers connected via TCP have bind =3D=3D NULL */ + if (bind) { + switch (bind->remote.in4.sin_family) { + case AF_INET: + sa4 =3D (struct sockaddr_in *)&sa; + + sa4->sin_family =3D AF_INET; + sa4->sin_addr.s_addr =3D bind->remote.in4.sin_addr.s_addr; + sa4->sin_port =3D bind->remote.in4.sin_port; + salen =3D sizeof(*sa4); + break; + case AF_INET6: + sa6 =3D (struct sockaddr_in6 *)&sa; + + sa6->sin6_family =3D AF_INET6; + sa6->sin6_addr =3D bind->remote.in6.sin6_addr; + sa6->sin6_port =3D bind->remote.in6.sin6_port; + salen =3D sizeof(*sa6); + break; + default: + ret =3D -EPROTONOSUPPORT; + goto out; + } + + nhead =3D ovpn_get_hash_head(ovpn->peers->by_transp_addr, &sa, + salen); + hlist_nulls_add_head_rcu(&peer->hash_entry_transp_addr, nhead); + } + + hlist_add_head_rcu(&peer->hash_entry_id, + ovpn_get_hash_head(ovpn->peers->by_id, &peer->id, + sizeof(peer->id))); + + if (peer->vpn_addrs.ipv4.s_addr !=3D htonl(INADDR_ANY)) { + nhead =3D ovpn_get_hash_head(ovpn->peers->by_vpn_addr, + &peer->vpn_addrs.ipv4, + sizeof(peer->vpn_addrs.ipv4)); + hlist_nulls_add_head_rcu(&peer->hash_entry_addr4, nhead); + } + + if (!ipv6_addr_any(&peer->vpn_addrs.ipv6)) { + nhead =3D ovpn_get_hash_head(ovpn->peers->by_vpn_addr, + &peer->vpn_addrs.ipv6, + sizeof(peer->vpn_addrs.ipv6)); + hlist_nulls_add_head_rcu(&peer->hash_entry_addr6, nhead); + } +out: + spin_unlock_bh(&ovpn->lock); + return ret; +} + /** * ovpn_peer_add_p2p - add peer to related tables in a P2P instance * @ovpn: the instance to add the peer to @@ -359,17 +443,35 @@ static int ovpn_peer_add_p2p(struct ovpn_priv *ovpn, = struct ovpn_peer *peer) int ovpn_peer_add(struct ovpn_priv *ovpn, struct ovpn_peer *peer) { switch (ovpn->mode) { + case OVPN_MODE_MP: + return ovpn_peer_add_mp(ovpn, peer); case OVPN_MODE_P2P: return ovpn_peer_add_p2p(ovpn, peer); - default: - return -EOPNOTSUPP; } + + return -EOPNOTSUPP; } =20 +/** + * ovpn_peer_remove - remove peer from internal state + * @peer: the peer to remove + * @reason: the delete reason to attach to the peer + * + * This function assumes that the peer is part of the ovpn peer + * collection and it will decrease the reference counter at the end + */ static void ovpn_peer_remove(struct ovpn_peer *peer, enum ovpn_del_peer_reason reason) { + lockdep_assert_held(&peer->ovpn->lock); + switch (peer->ovpn->mode) { + case OVPN_MODE_MP: + hlist_del_init_rcu(&peer->hash_entry_id); + hlist_nulls_del_init_rcu(&peer->hash_entry_addr4); + hlist_nulls_del_init_rcu(&peer->hash_entry_addr6); + hlist_nulls_del_init_rcu(&peer->hash_entry_transp_addr); + break; case OVPN_MODE_P2P: RCU_INIT_POINTER(peer->ovpn->peer, NULL); /* in P2P mode the carrier is switched off when the peer is @@ -377,8 +479,6 @@ static void ovpn_peer_remove(struct ovpn_peer *peer, */ netif_carrier_off(peer->ovpn->dev); break; - default: - return; } =20 peer->delete_reason =3D reason; @@ -389,6 +489,33 @@ static void ovpn_peer_remove(struct ovpn_peer *peer, ovpn_peer_put(peer); } =20 +/** + * ovpn_peer_del_mp - delete peer from related tables in a MP instance + * @peer: the peer to delete + * @reason: reason why the peer was deleted (sent to userspace) + * + * Return: 0 on success or a negative error code otherwise + */ +static int ovpn_peer_del_mp(struct ovpn_peer *peer, + enum ovpn_del_peer_reason reason) +{ + struct ovpn_peer *tmp; + int ret =3D -ENOENT; + + lockdep_assert_held(&peer->ovpn->lock); + + tmp =3D ovpn_peer_get_by_id(peer->ovpn, peer->id); + if (tmp =3D=3D peer) { + ovpn_peer_remove(peer, reason); + ret =3D 0; + } + + if (tmp) + ovpn_peer_put(tmp); + + return ret; +} + /** * ovpn_peer_del_p2p - delete peer from related tables in a P2P instance * @peer: the peer to delete @@ -442,10 +569,35 @@ void ovpn_peer_release_p2p(struct ovpn_priv *ovpn, */ int ovpn_peer_del(struct ovpn_peer *peer, enum ovpn_del_peer_reason reason) { + int ret =3D -EOPNOTSUPP; + + spin_lock_bh(&peer->ovpn->lock); switch (peer->ovpn->mode) { + case OVPN_MODE_MP: + ret =3D ovpn_peer_del_mp(peer, reason); + break; case OVPN_MODE_P2P: - return ovpn_peer_del_p2p(peer, reason); - default: - return -EOPNOTSUPP; + ret =3D ovpn_peer_del_p2p(peer, reason); + break; } + spin_unlock_bh(&peer->ovpn->lock); + return ret; +} + +/** + * ovpn_peers_free - free all peers in the instance + * @ovpn: the instance whose peers should be released + * @reason: the reason for releasing all peers + */ +void ovpn_peers_free(struct ovpn_priv *ovpn, + enum ovpn_del_peer_reason reason) +{ + struct hlist_node *tmp; + struct ovpn_peer *peer; + int bkt; + + spin_lock_bh(&ovpn->lock); + hash_for_each_safe(ovpn->peers->by_id, bkt, tmp, peer, hash_entry_id) + ovpn_peer_remove(peer, reason); + spin_unlock_bh(&ovpn->lock); } diff --git a/drivers/net/ovpn/peer.h b/drivers/net/ovpn/peer.h index 02e7e53792dcd69fb3d8371e9a447c6dc7aef016..636245521f9502ce9139affd7b9= 0d3ba918d1ea6 100644 --- a/drivers/net/ovpn/peer.h +++ b/drivers/net/ovpn/peer.h @@ -23,6 +23,10 @@ * @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 + * @hash_entry_id: entry in the peer ID hashtable + * @hash_entry_addr4: entry in the peer IPv4 hashtable + * @hash_entry_addr6: entry in the peer IPv6 hashtable + * @hash_entry_transp_addr: entry in the peer transport address hashtable * @sock: the socket being used to talk to this peer * @tcp: keeps track of TCP specific state * @tcp.strp: stream parser context (TCP only) @@ -55,6 +59,10 @@ struct ovpn_peer { struct in_addr ipv4; struct in6_addr ipv6; } vpn_addrs; + struct hlist_node hash_entry_id; + struct hlist_nulls_node hash_entry_addr4; + struct hlist_nulls_node hash_entry_addr6; + struct hlist_nulls_node hash_entry_transp_addr; struct ovpn_socket *sock; =20 /* state of the TCP reading. Needed to keep track of how much of a @@ -120,6 +128,7 @@ int ovpn_peer_add(struct ovpn_priv *ovpn, struct ovpn_p= eer *peer); int ovpn_peer_del(struct ovpn_peer *peer, enum ovpn_del_peer_reason reason= ); void ovpn_peer_release_p2p(struct ovpn_priv *ovpn, enum ovpn_del_peer_reason reason); +void ovpn_peers_free(struct ovpn_priv *ovpn, enum ovpn_del_peer_reason rea= son); =20 struct ovpn_peer *ovpn_peer_get_by_transp_addr(struct ovpn_priv *ovpn, struct sk_buff *skb); --=20 2.45.2