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Mon, 02 Dec 2024 07:08:42 -0800 (PST) From: Antonio Quartulli Date: Mon, 02 Dec 2024 16:07:33 +0100 Subject: [PATCH net-next v12 15/22] ovpn: add support for updating local UDP endpoint Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20241202-b4-ovpn-v12-15-239ff733bf97@openvpn.net> References: <20241202-b4-ovpn-v12-0-239ff733bf97@openvpn.net> In-Reply-To: <20241202-b4-ovpn-v12-0-239ff733bf97@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: Simon Horman , 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=2818; i=antonio@openvpn.net; h=from:subject:message-id; bh=OdBK3/xyCzwJOGcy6CtLEeb8qE/dLS0KYlWLU1j8sLQ=; b=owEBbQGS/pANAwAIAQtw5TqgONWHAcsmYgBnTc1ng3eOnJxyjaRxKBFcUAzY+47IQmoFfMXCl GNfENE3N9iJATMEAAEIAB0WIQSZq9xs+NQS5N5fwPwLcOU6oDjVhwUCZ03NZwAKCRALcOU6oDjV hxagB/42JJCU7vmJoSsY1aHvxhriTLKmiE8KmAC3YtjvCXXtyrMYfPhujWKaVI7ATgsemFpZy1X lW9B97irOl0mt8J9D848c+nZyZNpnIwpLS184vtcAGzGRvWNwUpPCG5Z59ZbYgw0rLtG8uPK4Fr WYoVxYkDVTVSjCGwq12kyt3F3iQT6Cb/n/AqJomf/9Ju393dm5LltAQCzTtO/cecoJnXXbWVUn+ KOgSwS9a5b36+h0P1HXF0ik67MLq6lZY45z+Z8R8Gm1USu/YXv429dHe1PUlTsGau2ltctqqo2t LIoJObk92x5/QE1/8uMjakm9tm2LKYGiF1optJdR55RndkaM 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 606a5c538d7918148dbb647d5e111d94f5759506..7df9fedd593a74e2349922557ce299a0fcf03038 100644 --- a/drivers/net/ovpn/peer.c +++ b/drivers/net/ovpn/peer.c @@ -450,6 +450,51 @@ struct ovpn_peer *ovpn_peer_get_by_id(struct ovpn_priv *ovpn, u32 peer_id) return peer; } +/** + * 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 = 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 != 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 = 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 -> %pI6c\n", + netdev_name(peer->ovpn->dev), + peer->id, &bind->local.ipv6, + &ipv6_hdr(skb)->daddr); + bind->local.ipv6 = 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 bbaabc73218948e3597dbc567a19b0a5823e32ff..196fa0a04f2db1986fffa6d51b42b68c9837c8e8 100644 --- a/drivers/net/ovpn/peer.h +++ b/drivers/net/ovpn/peer.h @@ -153,4 +153,7 @@ bool ovpn_peer_check_by_src(struct ovpn_priv *ovpn, struct sk_buff *skb, void ovpn_peer_keepalive_set(struct ovpn_peer *peer, u32 interval, u32 timeout); void ovpn_peer_keepalive_work(struct work_struct *work); +void ovpn_peer_update_local_endpoint(struct ovpn_peer *peer, + struct sk_buff *skb); + #endif /* _NET_OVPN_OVPNPEER_H_ */