From patchwork Thu Feb 27 01:21:42 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Antonio Quartulli X-Patchwork-Id: 13993439 Received: from mail-wm1-f48.google.com (mail-wm1-f48.google.com [209.85.128.48]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E92411B394E for ; Thu, 27 Feb 2025 01:23:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.48 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1740619391; cv=none; b=DK4nr9tyjk5l9KNKpJk5ZnwAVePYylOooRGGZLDTphw24yUyS+oV/BfT3aZcT7vZwevFDpgOK3A3A08C4giESJ/2LsWUM61EJiRiG8Hn/kLaYrbGEcAKzMZPvCF1SAOJjUrWNjdE/jK3SQvOd6uCc8Xbc9iFU/6BcGDmUl6MhMI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1740619391; c=relaxed/simple; bh=LdXfTiY3ufZ4Fa1v2FOAa+ZMTx72JzoMJE6Ba/itsl0=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=jWCvdATBsYNMRTwGaH/sMLPCAAS0pXryHMQLAVzoj/OwxMhkljQ7W67B3duHywDRrHRfCMVB0kSVxLTV9AxFu8pQ8HXOdP8rhf+HOUacNcqySZj5TO02gzb4iEOan6+JhhbidAP58UhiaKfinXMGaR3lg59cOtiVVidv4BPHU3c= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=openvpn.net; spf=pass smtp.mailfrom=openvpn.com; dkim=pass (2048-bit key) header.d=openvpn.net header.i=@openvpn.net header.b=LsEQEt2S; arc=none smtp.client-ip=209.85.128.48 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=openvpn.net Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=openvpn.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=openvpn.net header.i=@openvpn.net header.b="LsEQEt2S" Received: by mail-wm1-f48.google.com with SMTP id 5b1f17b1804b1-439a331d981so3644025e9.3 for ; Wed, 26 Feb 2025 17:23:07 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=openvpn.net; s=google; t=1740619386; x=1741224186; darn=vger.kernel.org; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:from:to:cc:subject:date:message-id :reply-to; bh=AAXPWxXuKtr23JYoUbw9I3CDTpJYOJ9UkZXOZ1IQ0Ts=; b=LsEQEt2SV75681G9b8cIaaCvUd+VUaHqEV4OCRaBo6n42bcpnZqQfoYDyVoMDJpaRs Fe2fonaz8DSxsyLn4IXBeH0hVCaq0zofViIux1cJEzA43tt3Ni25OOHwi3jaQnjz5nHx u1NOOvK5gI5cJa0TaeyEJE7NRMU/0txJXPTDQQ10rGM1utSfwjfu9LQzp6k6HtaN11Rb c8Gs1bG4dH5kgAJEieCQbOs/odbk27JZSVH8Nw4Y1wbFfXAtEVVcMdi+Yhgf/W6b4Wdx mZVA14TFJhl1PhCxvayp/PeRQbXDbUdc553FhCbcRvOe9NO6jKKmXD4QJsq7p+5zHl16 0rZg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1740619386; x=1741224186; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=AAXPWxXuKtr23JYoUbw9I3CDTpJYOJ9UkZXOZ1IQ0Ts=; b=owtfl+7araPP09umEPoiX9/4ICW2IxKpP9YJe/Lt5gd+PZOavaKHLFTso2o821V/qT gUfajEkrcHOa3fVa5KGzS7YBETqVHrlEnG1u847yjKb+c6rQF+kpVY8J339JDSF0W63i FR0YW4xnZlqthy0AmVPu7RSTcenOt09mIRnuO1UGWsCSohdlMYePEkaMHFpbpL1/1s6R Djtj3X/Jk/PWr68vieqMUnAytZoZzDEnqlXh+aAeo63pDr63ABs+WjuVXembvRwTMdxE 7sHoaevmH7wBH66ZXes88ImL6rHaogqVlpYf1mvfY56XNJONVNH2eoeQrjr/ruJVN9WY sl5Q== X-Forwarded-Encrypted: i=1; AJvYcCVRONIf7j0ofP80o9sOemoHuHVD6/r0atTKqt3HzwiR9221lLuhQOzzHUnfSx7LqIbZts3nGU7GsRjXo5o8EHU=@vger.kernel.org X-Gm-Message-State: AOJu0Yy9rbwUuEcHk+PpSY9EWAPTeKCm5Mjj0CitmBkl5kWdbg7xDPXk NHQTySiQRsGdykDjWlgCrz1Ppfc3P6NNvp9+wRrpziaaCfXoFbtuSdlEcCirV7Q= X-Gm-Gg: ASbGncuN1DP/hZClEakkppmUhA+XJuG4lLuyU0KBI9vSX3Yy9Z5qItYSpl9e+Jn4+C6 2W7JFToIZam8M/oUmvpIDLNNHE8MMvA972Lw3loHqV1Pe5jhonfOwnQAfeJYMAt7JwXBhBIwcRM eKqV2yN2/aW8JP/zPwHSJmVdCD7TYMJGTr8YBIkEflKsxxOd59XEq5mpPncjc76o0i8+DMz3wMv w/T8Lbrx1J63xx7mQGEFYhQyEdINuZdMIUXxqJf/ItSZrufQOy3fgNal8t/kArZ/HCwrDGBXZzY /tpmg7LpaokLYF+LUEHkSqyqF7B8mJMtIkqy0w== X-Google-Smtp-Source: AGHT+IG8a9noUC1eRWvsgdHl8dWsQ3E/Hd6YcxHEgS+X+yC2+fna1/a2AGDp0uySWAhe4mLI2bwn5Q== X-Received: by 2002:a05:600c:4f49:b0:439:88bb:d000 with SMTP id 5b1f17b1804b1-43ab90316eemr38928065e9.25.1740619386285; Wed, 26 Feb 2025 17:23:06 -0800 (PST) Received: from serenity.mandelbit.com ([2001:67c:2fbc:1:7418:f717:1e0a:e55a]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-43aba5327f0sm38375395e9.9.2025.02.26.17.23.05 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 26 Feb 2025 17:23:05 -0800 (PST) From: Antonio Quartulli Date: Thu, 27 Feb 2025 02:21:42 +0100 Subject: [PATCH net-next v20 17/25] ovpn: implement keepalive mechanism Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20250227-b4-ovpn-v20-17-93f363310834@openvpn.net> References: <20250227-b4-ovpn-v20-0-93f363310834@openvpn.net> In-Reply-To: <20250227-b4-ovpn-v20-0-93f363310834@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=15889; i=antonio@openvpn.net; h=from:subject:message-id; bh=LdXfTiY3ufZ4Fa1v2FOAa+ZMTx72JzoMJE6Ba/itsl0=; b=owEBbQGS/pANAwAIAQtw5TqgONWHAcsmYgBnv75hMHHsx6v4XHeayiM5ad26TZ5aSzVA6dB6K 2Jh4Va6JFqJATMEAAEIAB0WIQSZq9xs+NQS5N5fwPwLcOU6oDjVhwUCZ7++YQAKCRALcOU6oDjV h+AeB/9m48ImRLjgDplwwOxTRJtf5FGjuBDZ0WN7XZFu+DOvrkRtX1G8sFAqHY/iFsEpd2hCSAS i6DV20o4oSBdgT+SGhjOZI/cfFmIIy6a3TiLM5Oy+705qyhbv9BldaXmG0GQl9NqsAV0OmEieCP 1qeZJZvDHA5A8I9aCFFf0/Ncc4jHsvGtmBZcpxj8+//U6aP0/9219YWwnan8o/YkcnKOGN0B1Fz 8qK3oEHlK5dx0yRmFUZAIlCDOMg52NBM3TvMq8pXGr5E65UI3JZA07MxoAAlRpVpt1GgLJtsUnM +rIedK8CFAPpNRUos5wmcMSmtLzx/TRoe8U6rhA3wqL8uvRE X-Developer-Key: i=antonio@openvpn.net; a=openpgp; fpr=CABDA1282017C267219885C748F0CCB68F59D14C OpenVPN supports configuring a periodic keepalive packet. message to allow the remote endpoint detect link failures. This change implements the keepalive sending and timer expiring logic. Signed-off-by: Antonio Quartulli --- drivers/net/ovpn/io.c | 74 ++++++++++++++++ drivers/net/ovpn/io.h | 5 ++ drivers/net/ovpn/main.c | 3 + drivers/net/ovpn/ovpnpriv.h | 2 + drivers/net/ovpn/peer.c | 205 ++++++++++++++++++++++++++++++++++++++++++++ drivers/net/ovpn/peer.h | 21 ++++- 6 files changed, 308 insertions(+), 2 deletions(-) diff --git a/drivers/net/ovpn/io.c b/drivers/net/ovpn/io.c index 729f49ff6ce8001c2bbe804db0a617a2cc8965a8..6ee1a40082ef637285d7f7f8183c53140583b716 100644 --- a/drivers/net/ovpn/io.c +++ b/drivers/net/ovpn/io.c @@ -27,6 +27,33 @@ #include "skb.h" #include "socket.h" +const unsigned char ovpn_keepalive_message[OVPN_KEEPALIVE_SIZE] = { + 0x2a, 0x18, 0x7b, 0xf3, 0x64, 0x1e, 0xb4, 0xcb, + 0x07, 0xed, 0x2d, 0x0a, 0x98, 0x1f, 0xc7, 0x48 +}; + +/** + * ovpn_is_keepalive - check if skb contains a keepalive message + * @skb: packet to check + * + * Assumes that the first byte of skb->data is defined. + * + * Return: true if skb contains a keepalive or false otherwise + */ +static bool ovpn_is_keepalive(struct sk_buff *skb) +{ + if (*skb->data != ovpn_keepalive_message[0]) + return false; + + if (skb->len != OVPN_KEEPALIVE_SIZE) + return false; + + if (!pskb_may_pull(skb, OVPN_KEEPALIVE_SIZE)) + return false; + + return !memcmp(skb->data, ovpn_keepalive_message, OVPN_KEEPALIVE_SIZE); +} + /* Called after decrypt to write the IP packet to the device. * This method is expected to manage/free the skb. */ @@ -107,6 +134,9 @@ void ovpn_decrypt_post(void *data, int ret) goto drop; } + /* keep track of last received authenticated packet for keepalive */ + WRITE_ONCE(peer->last_recv, ktime_get_real_seconds()); + /* point to encapsulated IP packet */ __skb_pull(skb, payload_offset); @@ -124,6 +154,13 @@ void ovpn_decrypt_post(void *data, int ret) goto drop; } + if (ovpn_is_keepalive(skb)) { + net_dbg_ratelimited("%s: ping received from peer %u\n", + netdev_name(peer->ovpn->dev), + peer->id); + goto drop_nocount; + } + net_info_ratelimited("%s: unsupported protocol received from peer %u\n", netdev_name(peer->ovpn->dev), peer->id); goto drop; @@ -149,6 +186,7 @@ void ovpn_decrypt_post(void *data, int ret) drop: if (unlikely(skb)) dev_core_stats_rx_dropped_inc(peer->ovpn->dev); +drop_nocount: if (likely(peer)) ovpn_peer_put(peer); if (likely(ks)) @@ -233,6 +271,8 @@ void ovpn_encrypt_post(void *data, int ret) } ovpn_peer_stats_increment_tx(&peer->link_stats, orig_len); + /* keep track of last sent packet for keepalive */ + WRITE_ONCE(peer->last_sent, ktime_get_real_seconds()); /* skb passed down the stack - don't free it */ skb = NULL; err_unlock: @@ -365,3 +405,37 @@ netdev_tx_t ovpn_net_xmit(struct sk_buff *skb, struct net_device *dev) kfree_skb_list(skb); return NET_XMIT_DROP; } + +/** + * ovpn_xmit_special - encrypt and transmit an out-of-band message to peer + * @peer: peer to send the message to + * @data: message content + * @len: message length + * + * Assumes that caller holds a reference to peer, which will be + * passed to ovpn_send() + */ +void ovpn_xmit_special(struct ovpn_peer *peer, const void *data, + const unsigned int len) +{ + struct ovpn_priv *ovpn; + struct sk_buff *skb; + + ovpn = peer->ovpn; + if (unlikely(!ovpn)) { + ovpn_peer_put(peer); + return; + } + + skb = alloc_skb(256 + len, GFP_ATOMIC); + if (unlikely(!skb)) { + ovpn_peer_put(peer); + return; + } + + skb_reserve(skb, 128); + skb->priority = TC_PRIO_BESTEFFORT; + __skb_put_data(skb, data, len); + + ovpn_send(ovpn, skb, peer); +} diff --git a/drivers/net/ovpn/io.h b/drivers/net/ovpn/io.h index 5143104b2c4b896a030ec4a8c8aea7015f40ef02..db9e10f9077c4738ee79e5723e2a4bf5ef72f633 100644 --- a/drivers/net/ovpn/io.h +++ b/drivers/net/ovpn/io.h @@ -19,9 +19,14 @@ /* max padding required by encryption */ #define OVPN_MAX_PADDING 16 +#define OVPN_KEEPALIVE_SIZE 16 +extern const unsigned char ovpn_keepalive_message[OVPN_KEEPALIVE_SIZE]; + netdev_tx_t ovpn_net_xmit(struct sk_buff *skb, struct net_device *dev); void ovpn_recv(struct ovpn_peer *peer, struct sk_buff *skb); +void ovpn_xmit_special(struct ovpn_peer *peer, const void *data, + const unsigned int len); void ovpn_encrypt_post(void *data, int ret); void ovpn_decrypt_post(void *data, int ret); diff --git a/drivers/net/ovpn/main.c b/drivers/net/ovpn/main.c index bcbbc2200edd2e65190f5a7de07161321e16bb34..d123d47e128592521082b30061a2e42309488901 100644 --- a/drivers/net/ovpn/main.c +++ b/drivers/net/ovpn/main.c @@ -194,6 +194,7 @@ static int ovpn_newlink(struct net_device *dev, ovpn->dev = dev; ovpn->mode = mode; spin_lock_init(&ovpn->lock); + INIT_DELAYED_WORK(&ovpn->keepalive_work, ovpn_peer_keepalive_work); /* turn carrier explicitly off after registration, this way state is * clearly defined @@ -254,6 +255,8 @@ static int ovpn_netdev_notifier_call(struct notifier_block *nb, netif_carrier_off(dev); ovpn->registered = false; + cancel_delayed_work_sync(&ovpn->keepalive_work); + switch (ovpn->mode) { case OVPN_MODE_P2P: ovpn_peer_release_p2p(ovpn, NULL, diff --git a/drivers/net/ovpn/ovpnpriv.h b/drivers/net/ovpn/ovpnpriv.h index b26ad97215a3d42242ba349b348c2749f570797c..5403cdc99a67ca91604d1c3cefdea76dca83a44a 100644 --- a/drivers/net/ovpn/ovpnpriv.h +++ b/drivers/net/ovpn/ovpnpriv.h @@ -41,6 +41,7 @@ struct ovpn_peer_collection { * @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 + * @keepalive_work: struct used to schedule keepalive periodic job */ struct ovpn_priv { struct net_device *dev; @@ -50,6 +51,7 @@ struct ovpn_priv { struct ovpn_peer_collection *peers; struct ovpn_peer __rcu *peer; struct gro_cells gro_cells; + struct delayed_work keepalive_work; }; #endif /* _NET_OVPN_OVPNSTRUCT_H_ */ diff --git a/drivers/net/ovpn/peer.c b/drivers/net/ovpn/peer.c index b5af1a66df9989dd026e78bc595659b796198315..98c43509a4c9161db65a4bc876940bce33290fd3 100644 --- a/drivers/net/ovpn/peer.c +++ b/drivers/net/ovpn/peer.c @@ -36,6 +36,52 @@ static void unlock_ovpn(struct ovpn_priv *ovpn, } } +/** + * ovpn_peer_keepalive_set - configure keepalive values for peer + * @peer: the peer to configure + * @interval: outgoing keepalive interval + * @timeout: incoming keepalive timeout + */ +void ovpn_peer_keepalive_set(struct ovpn_peer *peer, u32 interval, u32 timeout) +{ + time64_t now = ktime_get_real_seconds(); + + netdev_dbg(peer->ovpn->dev, + "scheduling keepalive for peer %u: interval=%u timeout=%u\n", + peer->id, interval, timeout); + + peer->keepalive_interval = interval; + WRITE_ONCE(peer->last_sent, now); + peer->keepalive_xmit_exp = now + interval; + + peer->keepalive_timeout = timeout; + WRITE_ONCE(peer->last_recv, now); + peer->keepalive_recv_exp = now + timeout; + + /* now that interval and timeout have been changed, kick + * off the worker so that the next delay can be recomputed + */ + mod_delayed_work(system_wq, &peer->ovpn->keepalive_work, 0); +} + +/** + * ovpn_peer_keepalive_send - periodic worker sending keepalive packets + * @work: pointer to the work member of the related peer object + * + * NOTE: the reference to peer is not dropped because it gets inherited + * by ovpn_xmit_special() + */ +static void ovpn_peer_keepalive_send(struct work_struct *work) +{ + struct ovpn_peer *peer = container_of(work, struct ovpn_peer, + keepalive_work); + + local_bh_disable(); + ovpn_xmit_special(peer, ovpn_keepalive_message, + sizeof(ovpn_keepalive_message)); + local_bh_enable(); +} + /** * ovpn_peer_new - allocate and initialize a new peer object * @ovpn: the openvpn instance inside which the peer should be created @@ -65,6 +111,7 @@ struct ovpn_peer *ovpn_peer_new(struct ovpn_priv *ovpn, u32 id) kref_init(&peer->refcount); ovpn_peer_stats_init(&peer->vpn_stats); ovpn_peer_stats_init(&peer->link_stats); + INIT_WORK(&peer->keepalive_work, ovpn_peer_keepalive_send); ret = dst_cache_init(&peer->dst_cache, GFP_KERNEL); if (ret < 0) { @@ -939,3 +986,161 @@ void ovpn_peers_free(struct ovpn_priv *ovpn, struct sock *sk, } unlock_ovpn(ovpn, &release_list); } + +static time64_t ovpn_peer_keepalive_work_single(struct ovpn_peer *peer, + time64_t now, + struct llist_head *release_list) +{ + time64_t last_recv, last_sent, next_run1, next_run2; + unsigned long timeout, interval; + bool expired; + + spin_lock_bh(&peer->lock); + /* we expect both timers to be configured at the same time, + * therefore bail out if either is not set + */ + if (!peer->keepalive_timeout || !peer->keepalive_interval) { + spin_unlock_bh(&peer->lock); + return 0; + } + + /* check for peer timeout */ + expired = false; + timeout = peer->keepalive_timeout; + last_recv = READ_ONCE(peer->last_recv); + if (now < last_recv + timeout) { + peer->keepalive_recv_exp = last_recv + timeout; + next_run1 = peer->keepalive_recv_exp; + } else if (peer->keepalive_recv_exp > now) { + next_run1 = peer->keepalive_recv_exp; + } else { + expired = true; + } + + if (expired) { + /* peer is dead -> kill it and move on */ + spin_unlock_bh(&peer->lock); + netdev_dbg(peer->ovpn->dev, "peer %u expired\n", + peer->id); + ovpn_peer_remove(peer, OVPN_DEL_PEER_REASON_EXPIRED, + release_list); + return 0; + } + + /* check for peer keepalive */ + expired = false; + interval = peer->keepalive_interval; + last_sent = READ_ONCE(peer->last_sent); + if (now < last_sent + interval) { + peer->keepalive_xmit_exp = last_sent + interval; + next_run2 = peer->keepalive_xmit_exp; + } else if (peer->keepalive_xmit_exp > now) { + next_run2 = peer->keepalive_xmit_exp; + } else { + expired = true; + next_run2 = now + interval; + } + spin_unlock_bh(&peer->lock); + + if (expired) { + /* a keepalive packet is required */ + netdev_dbg(peer->ovpn->dev, + "sending keepalive to peer %u\n", + peer->id); + if (schedule_work(&peer->keepalive_work)) + ovpn_peer_hold(peer); + } + + if (next_run1 < next_run2) + return next_run1; + + return next_run2; +} + +static time64_t ovpn_peer_keepalive_work_mp(struct ovpn_priv *ovpn, + time64_t now, + struct llist_head *release_list) +{ + time64_t tmp_next_run, next_run = 0; + struct hlist_node *tmp; + struct ovpn_peer *peer; + int bkt; + + lockdep_assert_held(&ovpn->lock); + + hash_for_each_safe(ovpn->peers->by_id, bkt, tmp, peer, hash_entry_id) { + tmp_next_run = ovpn_peer_keepalive_work_single(peer, now, + release_list); + if (!tmp_next_run) + continue; + + /* the next worker run will be scheduled based on the shortest + * required interval across all peers + */ + if (!next_run || tmp_next_run < next_run) + next_run = tmp_next_run; + } + + return next_run; +} + +static time64_t ovpn_peer_keepalive_work_p2p(struct ovpn_priv *ovpn, + time64_t now, + struct llist_head *release_list) +{ + struct ovpn_peer *peer; + time64_t next_run = 0; + + lockdep_assert_held(&ovpn->lock); + + peer = rcu_dereference_protected(ovpn->peer, + lockdep_is_held(&ovpn->lock)); + if (peer) + next_run = ovpn_peer_keepalive_work_single(peer, now, + release_list); + + return next_run; +} + +/** + * ovpn_peer_keepalive_work - run keepalive logic on each known peer + * @work: pointer to the work member of the related ovpn object + * + * Each peer has two timers (if configured): + * 1. peer timeout: when no data is received for a certain interval, + * the peer is considered dead and it gets killed. + * 2. peer keepalive: when no data is sent to a certain peer for a + * certain interval, a special 'keepalive' packet is explicitly sent. + * + * This function iterates across the whole peer collection while + * checking the timers described above. + */ +void ovpn_peer_keepalive_work(struct work_struct *work) +{ + struct ovpn_priv *ovpn = container_of(work, struct ovpn_priv, + keepalive_work.work); + time64_t next_run = 0, now = ktime_get_real_seconds(); + LLIST_HEAD(release_list); + + spin_lock_bh(&ovpn->lock); + switch (ovpn->mode) { + case OVPN_MODE_MP: + next_run = ovpn_peer_keepalive_work_mp(ovpn, now, + &release_list); + break; + case OVPN_MODE_P2P: + next_run = ovpn_peer_keepalive_work_p2p(ovpn, now, + &release_list); + break; + } + + /* prevent rearming if the interface is being destroyed */ + if (next_run > 0 && ovpn->registered) { + netdev_dbg(ovpn->dev, + "scheduling keepalive work: now=%llu next_run=%llu delta=%llu\n", + next_run, now, next_run - now); + schedule_delayed_work(&ovpn->keepalive_work, + (next_run - now) * HZ); + } + unlock_ovpn(ovpn, &release_list); +} diff --git a/drivers/net/ovpn/peer.h b/drivers/net/ovpn/peer.h index e88f1e695bd7a4cb0827f8d552ee900a2b3f722e..c8e9218b1f1a096c3307ab6c687dd6836adf9741 100644 --- a/drivers/net/ovpn/peer.h +++ b/drivers/net/ovpn/peer.h @@ -45,13 +45,20 @@ * @crypto: the crypto configuration (ciphers, keys, etc..) * @dst_cache: cache for dst_entry used to send to peer * @bind: remote peer binding + * @keepalive_interval: seconds after which a new keepalive should be sent + * @keepalive_xmit_exp: future timestamp when next keepalive should be sent + * @last_sent: timestamp of the last successfully sent packet + * @keepalive_timeout: seconds after which an inactive peer is considered dead + * @keepalive_recv_exp: future timestamp when the peer should expire + * @last_recv: timestamp of the last authenticated received packet * @vpn_stats: per-peer in-VPN TX/RX stats * @link_stats: per-peer link/transport TX/RX stats * @delete_reason: why peer was deleted (i.e. timeout, transport error, ..) - * @lock: protects binding to peer (bind) + * @lock: protects binding to peer (bind) and keepalive* fields * @refcount: reference counter * @rcu: used to free peer in an RCU safe way * @release_entry: entry for the socket release list + * @keepalive_work: used to schedule keepalive sending */ struct ovpn_peer { struct ovpn_priv *ovpn; @@ -89,13 +96,20 @@ struct ovpn_peer { struct ovpn_crypto_state crypto; struct dst_cache dst_cache; struct ovpn_bind __rcu *bind; + unsigned long keepalive_interval; + unsigned long keepalive_xmit_exp; + time64_t last_sent; + unsigned long keepalive_timeout; + unsigned long keepalive_recv_exp; + time64_t last_recv; struct ovpn_peer_stats vpn_stats; struct ovpn_peer_stats link_stats; enum ovpn_del_peer_reason delete_reason; - spinlock_t lock; /* protects bind */ + spinlock_t lock; /* protects bind and keepalive* */ struct kref refcount; struct rcu_head rcu; struct llist_node release_entry; + struct work_struct keepalive_work; }; /** @@ -136,4 +150,7 @@ struct ovpn_peer *ovpn_peer_get_by_dst(struct ovpn_priv *ovpn, bool ovpn_peer_check_by_src(struct ovpn_priv *ovpn, struct sk_buff *skb, struct ovpn_peer *peer); +void ovpn_peer_keepalive_set(struct ovpn_peer *peer, u32 interval, u32 timeout); +void ovpn_peer_keepalive_work(struct work_struct *work); + #endif /* _NET_OVPN_OVPNPEER_H_ */