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Mon, 10 Feb 2025 16:41:22 -0800 (PST) From: Antonio Quartulli Date: Tue, 11 Feb 2025 01:40:11 +0100 Subject: [PATCH net-next v19 18/26] ovpn: add support for updating local UDP endpoint 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: <20250211-b4-ovpn-v19-18-86d5daf2a47a@openvpn.net> References: <20250211-b4-ovpn-v19-0-86d5daf2a47a@openvpn.net> In-Reply-To: <20250211-b4-ovpn-v19-0-86d5daf2a47a@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, Xiao Liang X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=2818; i=antonio@openvpn.net; h=from:subject:message-id; bh=kRLxFU3RIlci5q1fJZL+vCcCgb57tun1V4Hh8BduQcI=; b=owEBbQGS/pANAwAIAQtw5TqgONWHAcsmYgBnqpyORYiGL+cLU7KHfiPZWT6QIQluSWnOnBsf2 ya3X+1qzbeJATMEAAEIAB0WIQSZq9xs+NQS5N5fwPwLcOU6oDjVhwUCZ6qcjgAKCRALcOU6oDjV h6wDB/oCBdUEUiwyfpKf0bZFhoh6ICVUfioO1Mqvs9lXAWXe7QVQo+5YxOKqQUeIyornKSf5YRT 6Sb3hFVRvp49qyULn5TrkZT1EMz20W9xPvIKUVOiPbRXa3hz2oACZyvEFMB/bxSTHlzG+hRu1ub 8Bx3HWgj1cZxFj+karMvUQtK5IkniZIo9x/T3URan5+tVjaE9d4E0RWVIjpl0tIhbJ2DYZTDWLE 4OT3tbOjCfnkxRz3zmmag1LLQabIZD3h4BjECfX4bprU/kvFTzn9viuzuiKf3xgX8bumE4SpRCV pAMoKhB/qQCvd42taUFJbQLWFHWnhi8l112Rvw8syIF9X+Cx X-Developer-Key: i=antonio@openvpn.net; a=openpgp; fpr=CABDA1282017C267219885C748F0CCB68F59D14C In case of UDP links, the local endpoint used to communicate with a given peer may change without a connection restart. Add support for learning the new address in case of change. Signed-off-by: Antonio Quartulli --- drivers/net/ovpn/peer.c | 45 +++++++++++++++++++++++++++++++++++++++++++++ drivers/net/ovpn/peer.h | 3 +++ 2 files changed, 48 insertions(+) diff --git a/drivers/net/ovpn/peer.c b/drivers/net/ovpn/peer.c index 483d5a5d069f213930d6e7ea9130216988672d21..6cd83bbd85a8ffbe8ccb32598db= 2a5406583f886 100644 --- a/drivers/net/ovpn/peer.c +++ b/drivers/net/ovpn/peer.c @@ -513,6 +513,51 @@ static void ovpn_peer_remove(struct ovpn_peer *peer, schedule_work(&peer->remove_work); } =20 +/** + * ovpn_peer_update_local_endpoint - update local endpoint for peer + * @peer: peer to update the endpoint for + * @skb: incoming packet to retrieve the destination address (local) from + */ +void ovpn_peer_update_local_endpoint(struct ovpn_peer *peer, + struct sk_buff *skb) +{ + struct ovpn_bind *bind; + + rcu_read_lock(); + bind =3D rcu_dereference(peer->bind); + if (unlikely(!bind)) + goto unlock; + + spin_lock_bh(&peer->lock); + switch (skb->protocol) { + case htons(ETH_P_IP): + if (unlikely(bind->local.ipv4.s_addr !=3D ip_hdr(skb)->daddr)) { + net_dbg_ratelimited("%s: learning local IPv4 for peer %d (%pI4 -> %pI4)= \n", + netdev_name(peer->ovpn->dev), + peer->id, &bind->local.ipv4.s_addr, + &ip_hdr(skb)->daddr); + bind->local.ipv4.s_addr =3D ip_hdr(skb)->daddr; + } + break; + case htons(ETH_P_IPV6): + if (unlikely(!ipv6_addr_equal(&bind->local.ipv6, + &ipv6_hdr(skb)->daddr))) { + net_dbg_ratelimited("%s: learning local IPv6 for peer %d (%pI6c -> %pI6= c\n", + netdev_name(peer->ovpn->dev), + peer->id, &bind->local.ipv6, + &ipv6_hdr(skb)->daddr); + bind->local.ipv6 =3D ipv6_hdr(skb)->daddr; + } + break; + default: + break; + } + spin_unlock_bh(&peer->lock); + +unlock: + rcu_read_unlock(); +} + /** * ovpn_peer_get_by_dst - Lookup peer to send skb to * @ovpn: the private data representing the current VPN session diff --git a/drivers/net/ovpn/peer.h b/drivers/net/ovpn/peer.h index 68f8ed281b175311363787f71d582446e55efc79..18dd9c8acc06c8a9c9e1393d765= 06da80fe1b25b 100644 --- a/drivers/net/ovpn/peer.h +++ b/drivers/net/ovpn/peer.h @@ -152,4 +152,7 @@ bool ovpn_peer_check_by_src(struct ovpn_priv *ovpn, str= uct sk_buff *skb, void ovpn_peer_keepalive_set(struct ovpn_peer *peer, u32 interval, u32 tim= eout); void ovpn_peer_keepalive_work(struct work_struct *work); =20 +void ovpn_peer_update_local_endpoint(struct ovpn_peer *peer, + struct sk_buff *skb); + #endif /* _NET_OVPN_OVPNPEER_H_ */ --=20 2.45.3