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Message-Id: <20230512202311.2845526-14-dima@arista.com>
Date:   Fri, 12 May 2023 21:23:03 +0100
From:   Dmitry Safonov <dima@...sta.com>
To:     linux-kernel@...r.kernel.org, David Ahern <dsahern@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>
Cc:     Dmitry Safonov <dima@...sta.com>,
        Andy Lutomirski <luto@...capital.net>,
        Ard Biesheuvel <ardb@...nel.org>,
        Bob Gilligan <gilligan@...sta.com>,
        Dan Carpenter <error27@...il.com>,
        David Laight <David.Laight@...lab.com>,
        Dmitry Safonov <0x7f454c46@...il.com>,
        Eric Biggers <ebiggers@...nel.org>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Francesco Ruggeri <fruggeri05@...il.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        Ivan Delalande <colona@...sta.com>,
        Leonard Crestez <cdleonard@...il.com>,
        Salam Noureddine <noureddine@...sta.com>,
        netdev@...r.kernel.org
Subject: [PATCH v6 13/21] net/tcp: Add TCP-AO segments counters

Introduce segment counters that are useful for troubleshooting/debugging
as well as for writing tests.
Now there are global snmp counters as well as per-socket and per-key.

Co-developed-by: Francesco Ruggeri <fruggeri@...sta.com>
Signed-off-by: Francesco Ruggeri <fruggeri@...sta.com>
Co-developed-by: Salam Noureddine <noureddine@...sta.com>
Signed-off-by: Salam Noureddine <noureddine@...sta.com>
Signed-off-by: Dmitry Safonov <dima@...sta.com>
---
 include/net/dropreason-core.h | 15 +++++++++++----
 include/net/tcp.h             | 11 ++++++++---
 include/net/tcp_ao.h          | 10 ++++++++++
 include/uapi/linux/snmp.h     |  4 ++++
 include/uapi/linux/tcp.h      |  8 +++++++-
 net/ipv4/proc.c               |  4 ++++
 net/ipv4/tcp_ao.c             | 33 +++++++++++++++++++++++++++++----
 net/ipv4/tcp_ipv4.c           |  2 +-
 net/ipv6/tcp_ipv6.c           |  4 ++--
 9 files changed, 76 insertions(+), 15 deletions(-)

diff --git a/include/net/dropreason-core.h b/include/net/dropreason-core.h
index 0ff272d3b680..44ac4ebd8513 100644
--- a/include/net/dropreason-core.h
+++ b/include/net/dropreason-core.h
@@ -165,17 +165,24 @@ enum skb_drop_reason {
 	 */
 	SKB_DROP_REASON_TCP_MD5FAILURE,
 	/**
-	 * @SKB_DROP_REASON_TCP_AONOTFOUND: no TCP-AO hash and one was expected
+	 * @SKB_DROP_REASON_TCP_AONOTFOUND: no TCP-AO hash and one was expected,
+	 * corresponding to LINUX_MIB_TCPAOREQUIRED
 	 */
 	SKB_DROP_REASON_TCP_AONOTFOUND,
 	/**
 	 * @SKB_DROP_REASON_TCP_AOUNEXPECTED: TCP-AO hash is present and it
-	 * was not expected.
+	 * was not expected, corresponding to LINUX_MIB_TCPAOKEYNOTFOUND
 	 */
 	SKB_DROP_REASON_TCP_AOUNEXPECTED,
-	/** @SKB_DROP_REASON_TCP_AOKEYNOTFOUND: TCP-AO key is unknown */
+	/**
+	 * @SKB_DROP_REASON_TCP_AOKEYNOTFOUND: TCP-AO key is unknown,
+	 * corresponding to LINUX_MIB_TCPAOKEYNOTFOUND
+	 */
 	SKB_DROP_REASON_TCP_AOKEYNOTFOUND,
-	/** @SKB_DROP_REASON_TCP_AOFAILURE: TCP-AO hash is wrong */
+	/**
+	 * @SKB_DROP_REASON_TCP_AOFAILURE: TCP-AO hash is wrong,
+	 * corresponding to LINUX_MIB_TCPAOBAD
+	 */
 	SKB_DROP_REASON_TCP_AOFAILURE,
 	/**
 	 * @SKB_DROP_REASON_SOCKET_BACKLOG: failed to add skb to socket backlog (
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 5fe1b91854aa..57c7658cf296 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -2569,7 +2569,7 @@ static inline int tcp_parse_auth_options(const struct tcphdr *th,
 }
 
 static inline bool tcp_ao_required(struct sock *sk, const void *saddr,
-				   int family)
+				   int family, bool stat_inc)
 {
 #ifdef CONFIG_TCP_AO
 	struct tcp_ao_info *ao_info;
@@ -2581,8 +2581,13 @@ static inline bool tcp_ao_required(struct sock *sk, const void *saddr,
 		return false;
 
 	ao_key = tcp_ao_do_lookup(sk, saddr, family, -1, -1, 0);
-	if (ao_info->ao_required || ao_key)
+	if (ao_info->ao_required || ao_key) {
+		if (stat_inc) {
+			NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPAOREQUIRED);
+			atomic64_inc(&ao_info->counters.ao_required);
+		}
 		return true;
+	}
 #endif
 	return false;
 }
@@ -2620,7 +2625,7 @@ tcp_inbound_hash(struct sock *sk, const struct request_sock *req,
 		 * the last key is impossible to remove, so there's
 		 * always at least one current_key.
 		 */
-		if (tcp_ao_required(sk, saddr, family))
+		if (tcp_ao_required(sk, saddr, family, true))
 			return SKB_DROP_REASON_TCP_AONOTFOUND;
 		if (unlikely(tcp_md5_do_lookup(sk, l3index, saddr, family))) {
 			NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND);
diff --git a/include/net/tcp_ao.h b/include/net/tcp_ao.h
index fe2f4f62f917..bd67e3680a2b 100644
--- a/include/net/tcp_ao.h
+++ b/include/net/tcp_ao.h
@@ -20,6 +20,13 @@ struct tcp_ao_hdr {
 	u8	rnext_keyid;
 };
 
+struct tcp_ao_counters {
+	atomic64_t	pkt_good;
+	atomic64_t	pkt_bad;
+	atomic64_t	key_not_found;
+	atomic64_t	ao_required;
+};
+
 struct tcp_ao_key {
 	struct hlist_node	node;
 	union tcp_ao_addr	addr;
@@ -35,6 +42,8 @@ struct tcp_ao_key {
 	u8			maclen;
 	u8			digest_size;
 	struct rcu_head		rcu;
+	atomic64_t		pkt_good;
+	atomic64_t		pkt_bad;
 	u8			traffic_keys[];
 };
 
@@ -83,6 +92,7 @@ struct tcp_ao_info {
 	 */
 	struct tcp_ao_key	*current_key;
 	struct tcp_ao_key	*rnext_key;
+	struct tcp_ao_counters	counters;
 	u32			ao_required	:1,
 				__unused	:31;
 	__be32			lisn;
diff --git a/include/uapi/linux/snmp.h b/include/uapi/linux/snmp.h
index 26f33a4c253d..06ddf4cd295c 100644
--- a/include/uapi/linux/snmp.h
+++ b/include/uapi/linux/snmp.h
@@ -296,6 +296,10 @@ enum
 	LINUX_MIB_TCPMIGRATEREQSUCCESS,		/* TCPMigrateReqSuccess */
 	LINUX_MIB_TCPMIGRATEREQFAILURE,		/* TCPMigrateReqFailure */
 	LINUX_MIB_TCPPLBREHASH,			/* TCPPLBRehash */
+	LINUX_MIB_TCPAOREQUIRED,		/* TCPAORequired */
+	LINUX_MIB_TCPAOBAD,			/* TCPAOBad */
+	LINUX_MIB_TCPAOKEYNOTFOUND,		/* TCPAOKeyNotFound */
+	LINUX_MIB_TCPAOGOOD,			/* TCPAOGood */
 	__LINUX_MIB_MAX
 };
 
diff --git a/include/uapi/linux/tcp.h b/include/uapi/linux/tcp.h
index 250e0ce2cc38..3fe0612ec59a 100644
--- a/include/uapi/linux/tcp.h
+++ b/include/uapi/linux/tcp.h
@@ -391,9 +391,15 @@ struct tcp_ao_info_opt { /* setsockopt(TCP_AO_INFO) */
 	__u32   set_current	:1,	/* corresponding ::current_key */
 		set_rnext	:1,	/* corresponding ::rnext */
 		ao_required	:1,	/* don't accept non-AO connects */
-		reserved	:29;	/* must be 0 */
+		set_counters	:1,	/* set/clear ::pkt_* counters */
+		reserved	:28;	/* must be 0 */
+	__u16	reserved2;		/* padding, must be 0 */
 	__u8	current_key;		/* KeyID to set as Current_key */
 	__u8	rnext;			/* KeyID to set as Rnext_key */
+	__u64	pkt_good;		/* verified segments */
+	__u64	pkt_bad;		/* failed verification */
+	__u64	pkt_key_not_found;	/* could not find a key to verify */
+	__u64	pkt_ao_required;	/* segments missing TCP-AO sign */
 } __attribute__((aligned(8)));
 
 /* setsockopt(fd, IPPROTO_TCP, TCP_ZEROCOPY_RECEIVE, ...) */
diff --git a/net/ipv4/proc.c b/net/ipv4/proc.c
index eaf1d3113b62..3f643cd29cfe 100644
--- a/net/ipv4/proc.c
+++ b/net/ipv4/proc.c
@@ -298,6 +298,10 @@ static const struct snmp_mib snmp4_net_list[] = {
 	SNMP_MIB_ITEM("TCPMigrateReqSuccess", LINUX_MIB_TCPMIGRATEREQSUCCESS),
 	SNMP_MIB_ITEM("TCPMigrateReqFailure", LINUX_MIB_TCPMIGRATEREQFAILURE),
 	SNMP_MIB_ITEM("TCPPLBRehash", LINUX_MIB_TCPPLBREHASH),
+	SNMP_MIB_ITEM("TCPAORequired", LINUX_MIB_TCPAOREQUIRED),
+	SNMP_MIB_ITEM("TCPAOBad", LINUX_MIB_TCPAOBAD),
+	SNMP_MIB_ITEM("TCPAOKeyNotFound", LINUX_MIB_TCPAOKEYNOTFOUND),
+	SNMP_MIB_ITEM("TCPAOGood", LINUX_MIB_TCPAOGOOD),
 	SNMP_MIB_SENTINEL
 };
 
diff --git a/net/ipv4/tcp_ao.c b/net/ipv4/tcp_ao.c
index d43eff59e82f..4ef0418b9f5a 100644
--- a/net/ipv4/tcp_ao.c
+++ b/net/ipv4/tcp_ao.c
@@ -194,6 +194,8 @@ static struct tcp_ao_key *tcp_ao_copy_key(struct sock *sk,
 	*new_key = *key;
 	INIT_HLIST_NODE(&new_key->node);
 	tcp_sigpool_get(new_key->tcp_sigpool_id);
+	atomic64_set(&new_key->pkt_good, 0);
+	atomic64_set(&new_key->pkt_bad, 0);
 
 	return new_key;
 }
@@ -665,14 +667,25 @@ tcp_ao_verify_hash(const struct sock *sk, const struct sk_buff *skb,
 	u8 maclen = aoh->length - sizeof(struct tcp_ao_hdr);
 	const struct tcphdr *th = tcp_hdr(skb);
 
-	if (maclen != tcp_ao_maclen(key))
+	if (maclen != tcp_ao_maclen(key)) {
+		NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPAOBAD);
+		atomic64_inc(&info->counters.pkt_bad);
+		atomic64_inc(&key->pkt_bad);
 		return SKB_DROP_REASON_TCP_AOFAILURE;
+	}
 
 	/* XXX: make it per-AF callback? */
 	tcp_ao_hash_skb(family, newhash, key, sk, skb, traffic_key,
 			(phash - (u8 *)th), sne);
-	if (memcmp(phash, newhash, maclen))
+	if (memcmp(phash, newhash, maclen)) {
+		NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPAOBAD);
+		atomic64_inc(&info->counters.pkt_bad);
+		atomic64_inc(&key->pkt_bad);
 		return SKB_DROP_REASON_TCP_AOFAILURE;
+	}
+	NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPAOGOOD);
+	atomic64_inc(&info->counters.pkt_good);
+	atomic64_inc(&key->pkt_good);
 	return SKB_NOT_DROPPED_YET;
 }
 
@@ -691,8 +704,10 @@ tcp_inbound_ao_hash(struct sock *sk, const struct sk_buff *skb,
 	u32 sne = 0;
 
 	info = rcu_dereference(tcp_sk(sk)->ao_info);
-	if (!info)
+	if (!info) {
+		NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPAOKEYNOTFOUND);
 		return SKB_DROP_REASON_TCP_AOUNEXPECTED;
+	}
 
 	if (unlikely(th->syn)) {
 		sisn = th->seq;
@@ -787,6 +802,8 @@ tcp_inbound_ao_hash(struct sock *sk, const struct sk_buff *skb,
 				  traffic_key, phash, sne);
 
 key_not_found:
+	NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPAOKEYNOTFOUND);
+	atomic64_inc(&info->counters.key_not_found);
 	return SKB_DROP_REASON_TCP_AOKEYNOTFOUND;
 }
 EXPORT_SYMBOL_GPL(tcp_inbound_ao_hash);
@@ -1342,6 +1359,8 @@ static int tcp_ao_add_cmd(struct sock *sk, unsigned short int family,
 	key->keyflags	= cmd.keyflags;
 	key->sndid	= cmd.sndid;
 	key->rcvid	= cmd.rcvid;
+	atomic64_set(&key->pkt_good, 0);
+	atomic64_set(&key->pkt_bad, 0);
 
 	ret = tcp_ao_parse_crypto(&cmd, key);
 	if (ret < 0)
@@ -1553,7 +1572,7 @@ static int tcp_ao_info_cmd(struct sock *sk, unsigned short int family,
 			return -EINVAL;
 	}
 
-	if (cmd.reserved != 0)
+	if (cmd.reserved != 0 || cmd.reserved2 != 0)
 		return -EINVAL;
 
 	ao_info = rcu_dereference_protected(tcp_sk(sk)->ao_info,
@@ -1587,6 +1606,12 @@ static int tcp_ao_info_cmd(struct sock *sk, unsigned short int family,
 			goto out;
 		}
 	}
+	if (cmd.set_counters) {
+		atomic64_set(&ao_info->counters.pkt_good, cmd.pkt_good);
+		atomic64_set(&ao_info->counters.pkt_bad, cmd.pkt_bad);
+		atomic64_set(&ao_info->counters.key_not_found, cmd.pkt_key_not_found);
+		atomic64_set(&ao_info->counters.ao_required, cmd.pkt_ao_required);
+	}
 
 	ao_info->ao_required = cmd.ao_required;
 	if (new_current)
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index ab8152c51a62..9db6d7118c28 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -1546,7 +1546,7 @@ static int tcp_v4_parse_md5_keys(struct sock *sk, int optname,
 	/* Don't allow keys for peers that have a matching TCP-AO key.
 	 * See the comment in tcp_ao_add_cmd()
 	 */
-	if (tcp_ao_required(sk, addr, AF_INET))
+	if (tcp_ao_required(sk, addr, AF_INET, false))
 		return -EKEYREJECTED;
 
 	return tcp_md5_do_add(sk, addr, AF_INET, prefixlen, l3index, flags,
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index d30c21440501..6918076e1552 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -664,7 +664,7 @@ static int tcp_v6_parse_md5_keys(struct sock *sk, int optname,
 		/* Don't allow keys for peers that have a matching TCP-AO key.
 		 * See the comment in tcp_ao_add_cmd()
 		 */
-		if (tcp_ao_required(sk, addr, AF_INET))
+		if (tcp_ao_required(sk, addr, AF_INET, false))
 			return -EKEYREJECTED;
 		return tcp_md5_do_add(sk, addr,
 				      AF_INET, prefixlen, l3index, flags,
@@ -676,7 +676,7 @@ static int tcp_v6_parse_md5_keys(struct sock *sk, int optname,
 	/* Don't allow keys for peers that have a matching TCP-AO key.
 	 * See the comment in tcp_ao_add_cmd()
 	 */
-	if (tcp_ao_required(sk, addr, AF_INET6))
+	if (tcp_ao_required(sk, addr, AF_INET6, false))
 		return -EKEYREJECTED;
 
 	return tcp_md5_do_add(sk, addr, AF_INET6, prefixlen, l3index, flags,
-- 
2.40.0

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