From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 19B0E6FA1 for ; Wed, 30 Nov 2022 18:26:08 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 93694C433D6; Wed, 30 Nov 2022 18:26:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1669832767; bh=l1xllPJ4B6TNy4qLQl6IDmc57DRfuWx8yoJWqi5+u/U=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=aWzsNx6y5wh7fCkucPRRnGmHz0e7h/daf3zaX7lNXL/nnfCCwgA+DTmMKYov94P4a Vg/bGSu3T0se/lErHmG30dJFp15YT8dEnOY87vrnF9h6nbDPny5SEZfg9XPrmvT7bU htkHFv0t/LZgFq9o9+TVD/SGTZCWixTHSr1UaiYc= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Christian Langrock , Steffen Klassert , Sasha Levin Subject: [PATCH 5.10 033/162] xfrm: replay: Fix ESN wrap around for GSO Date: Wed, 30 Nov 2022 19:21:54 +0100 Message-Id: <20221130180529.401421543@linuxfoundation.org> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221130180528.466039523@linuxfoundation.org> References: <20221130180528.466039523@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Christian Langrock [ Upstream commit 4b549ccce941798703f159b227aa28c716aa78fa ] When using GSO it can happen that the wrong seq_hi is used for the last packets before the wrap around. This can lead to double usage of a sequence number. To avoid this, we should serialize this last GSO packet. Fixes: d7dbefc45cf5 ("xfrm: Add xfrm_replay_overflow functions for offloading") Co-developed-by: Steffen Klassert Signed-off-by: Christian Langrock Signed-off-by: Steffen Klassert Signed-off-by: Sasha Levin --- net/ipv4/esp4_offload.c | 3 +++ net/ipv6/esp6_offload.c | 3 +++ net/xfrm/xfrm_device.c | 15 ++++++++++++++- net/xfrm/xfrm_replay.c | 2 +- 4 files changed, 21 insertions(+), 2 deletions(-) diff --git a/net/ipv4/esp4_offload.c b/net/ipv4/esp4_offload.c index 3450c9ba2728..84257678160a 100644 --- a/net/ipv4/esp4_offload.c +++ b/net/ipv4/esp4_offload.c @@ -312,6 +312,9 @@ static int esp_xmit(struct xfrm_state *x, struct sk_buff *skb, netdev_features_ xo->seq.low += skb_shinfo(skb)->gso_segs; } + if (xo->seq.low < seq) + xo->seq.hi++; + esp.seqno = cpu_to_be64(seq + ((u64)xo->seq.hi << 32)); ip_hdr(skb)->tot_len = htons(skb->len); diff --git a/net/ipv6/esp6_offload.c b/net/ipv6/esp6_offload.c index 1c3f02d05d2b..7608be04d0f5 100644 --- a/net/ipv6/esp6_offload.c +++ b/net/ipv6/esp6_offload.c @@ -343,6 +343,9 @@ static int esp6_xmit(struct xfrm_state *x, struct sk_buff *skb, netdev_features xo->seq.low += skb_shinfo(skb)->gso_segs; } + if (xo->seq.low < seq) + xo->seq.hi++; + esp.seqno = cpu_to_be64(xo->seq.low + ((u64)xo->seq.hi << 32)); len = skb->len - sizeof(struct ipv6hdr); diff --git a/net/xfrm/xfrm_device.c b/net/xfrm/xfrm_device.c index c255aac6b816..8b8e957a69c3 100644 --- a/net/xfrm/xfrm_device.c +++ b/net/xfrm/xfrm_device.c @@ -97,6 +97,18 @@ static void xfrm_outer_mode_prep(struct xfrm_state *x, struct sk_buff *skb) } } +static inline bool xmit_xfrm_check_overflow(struct sk_buff *skb) +{ + struct xfrm_offload *xo = xfrm_offload(skb); + __u32 seq = xo->seq.low; + + seq += skb_shinfo(skb)->gso_segs; + if (unlikely(seq < xo->seq.low)) + return true; + + return false; +} + struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again) { int err; @@ -134,7 +146,8 @@ struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t featur return skb; } - if (skb_is_gso(skb) && unlikely(x->xso.dev != dev)) { + if (skb_is_gso(skb) && (unlikely(x->xso.dev != dev) || + unlikely(xmit_xfrm_check_overflow(skb)))) { struct sk_buff *segs; /* Packet got rerouted, fixup features and segment it. */ diff --git a/net/xfrm/xfrm_replay.c b/net/xfrm/xfrm_replay.c index c6a4338a0d08..65d009e3b6bb 100644 --- a/net/xfrm/xfrm_replay.c +++ b/net/xfrm/xfrm_replay.c @@ -657,7 +657,7 @@ static int xfrm_replay_overflow_offload_esn(struct xfrm_state *x, struct sk_buff oseq += skb_shinfo(skb)->gso_segs; } - if (unlikely(oseq < replay_esn->oseq)) { + if (unlikely(xo->seq.low < replay_esn->oseq)) { XFRM_SKB_CB(skb)->seq.output.hi = ++oseq_hi; xo->seq.hi = oseq_hi; replay_esn->oseq_hi = oseq_hi; -- 2.35.1