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tls: rx: add counter for NoPad violations

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As discussed with Maxim add a counter for true NoPad violations.
This should help deployments catch unexpected padded records vs
just control records which always need re-encryption.

https: //lore.kernel.org/all/b111828e6ac34baad9f4e783127eba8344ac252d.camel@nvidia.com/
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jakub Kicinski 2022-07-08 19:52:53 -07:00
parent 1090c1ea22
commit bb56cea9ab
4 changed files with 8 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
Documentation/networking/tls.rst
View File

@ -282,3 +282,7 @@ TLS implementation exposes the following per-namespace statistics
number of RX records which had to be re-decrypted due to
``TLS_RX_EXPECT_NO_PAD`` mis-prediction. Note that this counter will
also increment for non-data records.
- ``TlsRxNoPadViolation`` -
number of data RX records which had to be re-decrypted due to
``TLS_RX_EXPECT_NO_PAD`` mis-prediction.

1
include/uapi/linux/snmp.h
View File

@ -345,6 +345,7 @@ enum
LINUX_MIB_TLSDECRYPTERROR, /* TlsDecryptError */
LINUX_MIB_TLSRXDEVICERESYNC, /* TlsRxDeviceResync */
LINUX_MIB_TLSDECRYPTRETRY, /* TlsDecryptRetry */
LINUX_MIB_TLSRXNOPADVIOL, /* TlsRxNoPadViolation */
__LINUX_MIB_TLSMAX
};

1
net/tls/tls_proc.c
View File

@ -21,6 +21,7 @@ static const struct snmp_mib tls_mib_list[] = {
SNMP_MIB_ITEM("TlsDecryptError", LINUX_MIB_TLSDECRYPTERROR),
SNMP_MIB_ITEM("TlsRxDeviceResync", LINUX_MIB_TLSRXDEVICERESYNC),
SNMP_MIB_ITEM("TlsDecryptRetry", LINUX_MIB_TLSDECRYPTRETRY),
SNMP_MIB_ITEM("TlsRxNoPadViolation", LINUX_MIB_TLSRXNOPADVIOL),
SNMP_MIB_SENTINEL
};

2
net/tls/tls_sw.c
View File

@ -1596,6 +1596,8 @@ static int decrypt_skb_update(struct sock *sk, struct sk_buff *skb,
if (unlikely(darg->zc && prot->version == TLS_1_3_VERSION &&
darg->tail != TLS_RECORD_TYPE_DATA)) {
darg->zc = false;
if (!darg->tail)
TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSRXNOPADVIOL);
TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSDECRYPTRETRY);
return decrypt_skb_update(sk, skb, dest, darg);
}