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Thu, 17 Sep 2026 15:45:24 -0700 (PDT) Received: from dev-rjethwani.dev.purestorage.com ([208.88.159.129]) by smtp.googlemail.com with ESMTPSA id 586e51a60fabf-4870ac16ec0sm88605fac.5.2026.09.17.15.45.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 17 Sep 2026 15:45:24 -0700 (PDT) From: Rishikesh Jethwani To: netdev@vger.kernel.org Cc: saeedm@nvidia.com, tariqt@nvidia.com, mbloch@nvidia.com, borisp@nvidia.com, john.fastabend@gmail.com, kuba@kernel.org, sd@queasysnail.net, davem@davemloft.net, pabeni@redhat.com, edumazet@google.com, leon@kernel.org, andrew.gospodarek@broadcom.com, Rishikesh Jethwani Subject: [PATCH net-next v17 09/15] net: skbuff: add skb->decrypt_failed bit Date: Thu, 17 Sep 2026 16:35:20 -0600 Message-ID: <20260917224355.2288021-10-rjethwani@purestorage.com> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20260917224355.2288021-1-rjethwani@purestorage.com> References: <20260917224355.2288021-1-rjethwani@purestorage.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Add skb->decrypt_failed, set when hardware could not authenticate an skb's TLS payload. The payload may have been transformed (XORed) or left as wire ciphertext, so software must re-authenticate the record and undo the transform on any XORed fragment before it can be decrypted. Propagate it in skb_copy_decrypted() alongside skb->decrypted. Guarded by CONFIG_SKB_DECRYPTED like skb->decrypted. This is a prerequisite for TLS 1.3 device-offload RX KeyUpdate support, where the NIC flags records it could not authenticate across a key change. Signed-off-by: Rishikesh Jethwani --- include/linux/skbuff.h | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h index 421f6fc45451..5da2c1149d98 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -851,6 +851,10 @@ enum skb_tstamp_type { * unreadable. * @dst_pending_confirm: need to confirm neighbour * @decrypted: Decrypted SKB + * @decrypt_failed: hardware could not authenticate this skb's TLS payload. + * The payload may have been transformed (XORed) or left as wire + * ciphertext, so software must re-authenticate the record and undo the + * transform on any XORed fragment before it can be decrypted * @slow_gro: state present at GRO time, slower prepare step required * @tstamp_type: When set, skb->tstamp has the * delivery_time clock base of skb->tstamp. @@ -1025,6 +1029,7 @@ struct sk_buff { #endif #ifdef CONFIG_SKB_DECRYPTED __u8 decrypted:1; + __u8 decrypt_failed:1; #endif __u8 slow_gro:1; #if IS_ENABLED(CONFIG_IP_SCTP) @@ -1716,6 +1721,7 @@ static inline void skb_copy_decrypted(struct sk_buff *to, { #ifdef CONFIG_SKB_DECRYPTED to->decrypted = from->decrypted; + to->decrypt_failed = from->decrypt_failed; #endif } -- 2.50.1