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charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20241025-b4-ovpn-v10-17-b87530777be7@openvpn.net> References: <20241025-b4-ovpn-v10-0-b87530777be7@openvpn.net> In-Reply-To: <20241025-b4-ovpn-v10-0-b87530777be7@openvpn.net> To: Eric Dumazet , Jakub Kicinski , Paolo Abeni , Donald Hunter , Antonio Quartulli , Shuah Khan , donald.hunter@gmail.com, sd@queasysnail.net, ryazanov.s.a@gmail.com, Andrew Lunn Cc: netdev@vger.kernel.org, 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=6844; i=antonio@openvpn.net; h=from:subject:message-id; bh=EM1n5XLP46bbcYieB0EmGrRjiLgTqXNxQB8X9Bg+dYo=; b=owEBbQGS/pANAwAIAQtw5TqgONWHAcsmYgBnG2GaZKFBQZBg/wFlHoiZNSHJQTbzMj3I2Z1ux tmEOMp2msyJATMEAAEIAB0WIQSZq9xs+NQS5N5fwPwLcOU6oDjVhwUCZxthmgAKCRALcOU6oDjV h/uPCACIfdBPreUkQynULHjX3TLO/XpYoavX1qxmiRVBFFhJA7McRHe/C10XyI55WyeReKIMhPx f5avpMotrq83ODklrFE9PZY5HSqOTsn/KeT7EmQL2+jXQx6ID6lw66RanWscIpTtwy9L2XEY+js Bp5ClaVo05FlyrHZU5g/HGtYA4qsKjdcQBj/FA6vFRaOF+2l6bDwbD3TZTQzxgH7mI436MJhOcc CdNQmdlCieW019UBjhxgGjumXSGZBCUj4/Ij/EjCuuyssM95oPCBowf/n4P3J0QEwxabaZdjAr6 owRIYfB3rREeKB+jnDobAPNsvUppaYYXverXLPvLMadCHz0l X-Developer-Key: i=antonio@openvpn.net; a=openpgp; fpr=CABDA1282017C267219885C748F0CCB68F59D14C A peer connected via UDP may change its IP address without reconnecting (float). Add support for detecting and updating the new peer IP/port in case of floating. Signed-off-by: Antonio Quartulli --- drivers/net/ovpn/bind.c | 10 ++-- drivers/net/ovpn/io.c | 9 ++++ drivers/net/ovpn/peer.c | 129 ++++++++++++++++++++++++++++++++++++++++++++= ++-- drivers/net/ovpn/peer.h | 2 + 4 files changed, 139 insertions(+), 11 deletions(-) diff --git a/drivers/net/ovpn/bind.c b/drivers/net/ovpn/bind.c index b4d2ccec2ceddf43bc445b489cc62a578ef0ad0a..d17d078c5730bf4336dc87f45cd= ba3f6b8cad770 100644 --- a/drivers/net/ovpn/bind.c +++ b/drivers/net/ovpn/bind.c @@ -47,12 +47,8 @@ struct ovpn_bind *ovpn_bind_from_sockaddr(const struct s= ockaddr_storage *ss) * @new: the new bind to assign */ void ovpn_bind_reset(struct ovpn_peer *peer, struct ovpn_bind *new) + __must_hold(&peer->lock) { - struct ovpn_bind *old; - - spin_lock_bh(&peer->lock); - old =3D rcu_replace_pointer(peer->bind, new, true); - spin_unlock_bh(&peer->lock); - - kfree_rcu(old, rcu); + kfree_rcu(rcu_replace_pointer(peer->bind, new, + lockdep_is_held(&peer->lock)), rcu); } diff --git a/drivers/net/ovpn/io.c b/drivers/net/ovpn/io.c index 63c140138bf98e5d1df79a2565b666d86513323d..0e8a6f2c76bc7b2ccc287ad1187= cf50f033bf261 100644 --- a/drivers/net/ovpn/io.c +++ b/drivers/net/ovpn/io.c @@ -135,6 +135,15 @@ void ovpn_decrypt_post(void *data, int ret) /* keep track of last received authenticated packet for keepalive */ peer->last_recv =3D ktime_get_real_seconds(); =20 + if (peer->sock->sock->sk->sk_protocol =3D=3D IPPROTO_UDP) { + /* check if this peer changed it's IP address and update + * state + */ + ovpn_peer_float(peer, skb); + /* update source endpoint for this peer */ + ovpn_peer_update_local_endpoint(peer, skb); + } + /* point to encapsulated IP packet */ __skb_pull(skb, payload_offset); =20 diff --git a/drivers/net/ovpn/peer.c b/drivers/net/ovpn/peer.c index 3f67d200e283213fcb732d10f9edeb53e0a0e9ee..da6215bbb643592e4567e61e4b4= 976d367ed109c 100644 --- a/drivers/net/ovpn/peer.c +++ b/drivers/net/ovpn/peer.c @@ -94,6 +94,131 @@ struct ovpn_peer *ovpn_peer_new(struct ovpn_struct *ovp= n, u32 id) return peer; } =20 +/** + * ovpn_peer_reset_sockaddr - recreate binding for peer + * @peer: peer to recreate the binding for + * @ss: sockaddr to use as remote endpoint for the binding + * @local_ip: local IP for the binding + * + * 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) + __must_hold(&peer->lock) +{ + struct ovpn_bind *bind; + size_t ip_len; + + /* create new ovpn_bind object */ + bind =3D ovpn_bind_from_sockaddr(ss); + if (IS_ERR(bind)) + return PTR_ERR(bind); + + if (local_ip) { + if (ss->ss_family =3D=3D AF_INET) { + ip_len =3D sizeof(struct in_addr); + } else if (ss->ss_family =3D=3D AF_INET6) { + ip_len =3D sizeof(struct in6_addr); + } else { + netdev_dbg(peer->ovpn->dev, "%s: invalid family for remote endpoint\n", + __func__); + kfree(bind); + return -EINVAL; + } + + memcpy(&bind->local, local_ip, ip_len); + } + + /* set binding */ + ovpn_bind_reset(peer, bind); + + return 0; +} + +#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_float - update remote endpoint for peer + * @peer: peer to update the remote endpoint for + * @skb: incoming packet to retrieve the source address (remote) from + */ +void ovpn_peer_float(struct ovpn_peer *peer, struct sk_buff *skb) +{ + struct hlist_nulls_head *nhead; + struct sockaddr_storage ss; + const u8 *local_ip =3D NULL; + struct sockaddr_in6 *sa6; + struct sockaddr_in *sa; + struct ovpn_bind *bind; + sa_family_t family; + size_t salen; + + rcu_read_lock(); + bind =3D rcu_dereference(peer->bind); + if (unlikely(!bind)) { + rcu_read_unlock(); + return; + } + + spin_lock_bh(&peer->lock); + if (likely(ovpn_bind_skb_src_match(bind, skb))) + goto unlock; + + family =3D skb_protocol_to_family(skb); + + if (bind->remote.in4.sin_family =3D=3D family) + local_ip =3D (u8 *)&bind->local; + + switch (family) { + case AF_INET: + sa =3D (struct sockaddr_in *)&ss; + sa->sin_family =3D AF_INET; + sa->sin_addr.s_addr =3D ip_hdr(skb)->saddr; + sa->sin_port =3D udp_hdr(skb)->source; + salen =3D sizeof(*sa); + break; + case AF_INET6: + sa6 =3D (struct sockaddr_in6 *)&ss; + sa6->sin6_family =3D AF_INET6; + sa6->sin6_addr =3D ipv6_hdr(skb)->saddr; + sa6->sin6_port =3D udp_hdr(skb)->source; + sa6->sin6_scope_id =3D ipv6_iface_scope_id(&ipv6_hdr(skb)->saddr, + skb->skb_iif); + salen =3D sizeof(*sa6); + break; + default: + goto unlock; + } + + netdev_dbg(peer->ovpn->dev, "%s: peer %d floated to %pIScp", __func__, + peer->id, &ss); + ovpn_peer_reset_sockaddr(peer, (struct sockaddr_storage *)&ss, + local_ip); + spin_unlock_bh(&peer->lock); + rcu_read_unlock(); + + /* rehashing is required only in MP mode as P2P has one peer + * only and thus there is no hashtable + */ + if (peer->ovpn->mode =3D=3D OVPN_MODE_MP) { + spin_lock_bh(&peer->ovpn->peers->lock); + /* remove old hashing */ + hlist_nulls_del_init_rcu(&peer->hash_entry_transp_addr); + /* re-add with new transport address */ + nhead =3D ovpn_get_hash_head(peer->ovpn->peers->by_transp_addr, + &ss, salen); + hlist_nulls_add_head_rcu(&peer->hash_entry_transp_addr, nhead); + spin_unlock_bh(&peer->ovpn->peers->lock); + } + return; +unlock: + spin_unlock_bh(&peer->lock); + rcu_read_unlock(); +} + static void ovpn_peer_release(struct ovpn_peer *peer) { if (peer->sock) @@ -186,10 +311,6 @@ static struct in6_addr ovpn_nexthop_from_skb6(struct s= k_buff *skb) return rt->rt6i_gateway; } =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_get_by_vpn_addr4 - retrieve peer by its VPN IPv4 address * @ovpn: the openvpn instance to search diff --git a/drivers/net/ovpn/peer.h b/drivers/net/ovpn/peer.h index 1a8638d266b11a4a80ee2f088394d47a7798c3af..940cea5372ec0375cfe3e673154= a1e0248978409 100644 --- a/drivers/net/ovpn/peer.h +++ b/drivers/net/ovpn/peer.h @@ -155,4 +155,6 @@ void ovpn_peer_keepalive_work(struct work_struct *work); void ovpn_peer_update_local_endpoint(struct ovpn_peer *peer, struct sk_buff *skb); =20 +void ovpn_peer_float(struct ovpn_peer *peer, struct sk_buff *skb); + #endif /* _NET_OVPN_OVPNPEER_H_ */ --=20 2.45.2