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Miller" , linux-kernel@vger.kernel.org Cc: Dmitry Safonov , Andy Lutomirski , Ard Biesheuvel , Bob Gilligan , David Ahern , Dmitry Safonov <0x7f454c46@gmail.com>, Eric Biggers , Francesco Ruggeri , Herbert Xu , Hideaki YOSHIFUJI , Ivan Delalande , Jakub Kicinski , Leonard Crestez , Paolo Abeni , Salam Noureddine , Shuah Khan , netdev@vger.kernel.org, linux-crypto@vger.kernel.org Subject: [PATCH 18/31] net/tcp: Add TCP-AO segments counters Date: Thu, 18 Aug 2022 17:59:52 +0100 Message-Id: <20220818170005.747015-19-dima@arista.com> X-Mailer: git-send-email 2.37.2 In-Reply-To: <20220818170005.747015-1-dima@arista.com> References: <20220818170005.747015-1-dima@arista.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 Signed-off-by: Francesco Ruggeri Co-developed-by: Salam Noureddine Signed-off-by: Salam Noureddine Signed-off-by: Dmitry Safonov --- include/net/dropreason.h | 15 +++++++++++---- include/net/tcp.h | 9 ++++++++- include/net/tcp_ao.h | 10 ++++++++++ include/uapi/linux/snmp.h | 4 ++++ net/ipv4/proc.c | 4 ++++ net/ipv4/tcp_ao.c | 25 ++++++++++++++++++++++--- 6 files changed, 59 insertions(+), 8 deletions(-) diff --git a/include/net/dropreason.h b/include/net/dropreason.h index b4906323b9a7..dd90cca282eb 100644 --- a/include/net/dropreason.h +++ b/include/net/dropreason.h @@ -81,17 +81,24 @@ 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 2e75c542e7ed..94573219f58d 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -2538,8 +2538,15 @@ tcp_inbound_hash(struct sock *sk, const struct request_sock *req, * always at least one current_key. */ #ifdef CONFIG_TCP_AO - if (unlikely(tcp_ao_do_lookup(sk, saddr, family, -1, -1, 0))) + if (unlikely(tcp_ao_do_lookup(sk, saddr, family, -1, -1, 0))) { + struct tcp_ao_info *ao_info; + + ao_info = rcu_dereference_check(tcp_sk(sk)->ao_info, + lockdep_sock_is_held(sk)); + NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPAOREQUIRED); + atomic64_inc(&ao_info->counters.ao_required); return SKB_DROP_REASON_TCP_AONOTFOUND; + } #endif 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 7cb802de49ba..dbeaa7d4e212 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[]; }; @@ -78,6 +87,7 @@ struct tcp_ao_info { */ struct tcp_ao_key *volatile current_key; struct tcp_ao_key *rnext_key; + struct tcp_ao_counters counters; u8 ao_flags; __be32 lisn; __be32 risn; diff --git a/include/uapi/linux/snmp.h b/include/uapi/linux/snmp.h index 4d7470036a8b..f09119db8b40 100644 --- a/include/uapi/linux/snmp.h +++ b/include/uapi/linux/snmp.h @@ -292,6 +292,10 @@ enum LINUX_MIB_TCPDSACKIGNOREDDUBIOUS, /* TCPDSACKIgnoredDubious */ LINUX_MIB_TCPMIGRATEREQSUCCESS, /* TCPMigrateReqSuccess */ LINUX_MIB_TCPMIGRATEREQFAILURE, /* TCPMigrateReqFailure */ + LINUX_MIB_TCPAOREQUIRED, /* TCPAORequired */ + LINUX_MIB_TCPAOBAD, /* TCPAOBad */ + LINUX_MIB_TCPAOKEYNOTFOUND, /* TCPAOKeyNotFound */ + LINUX_MIB_TCPAOGOOD, /* TCPAOGood */ __LINUX_MIB_MAX }; diff --git a/net/ipv4/proc.c b/net/ipv4/proc.c index 0088a4c64d77..1b5a078adcf1 100644 --- a/net/ipv4/proc.c +++ b/net/ipv4/proc.c @@ -297,6 +297,10 @@ static const struct snmp_mib snmp4_net_list[] = { SNMP_MIB_ITEM("TCPDSACKIgnoredDubious", LINUX_MIB_TCPDSACKIGNOREDDUBIOUS), SNMP_MIB_ITEM("TCPMigrateReqSuccess", LINUX_MIB_TCPMIGRATEREQSUCCESS), SNMP_MIB_ITEM("TCPMigrateReqFailure", LINUX_MIB_TCPMIGRATEREQFAILURE), + 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 10cd6af3c45f..3a33733a714d 100644 --- a/net/ipv4/tcp_ao.c +++ b/net/ipv4/tcp_ao.c @@ -216,6 +216,8 @@ struct tcp_ao_key *tcp_ao_copy_key(struct sock *sk, struct tcp_ao_key *key) *new_key = *key; INIT_HLIST_NODE(&new_key->node); crypto_pool_add(new_key->crypto_pool_id); + atomic64_set(&new_key->pkt_good, 0); + atomic64_set(&new_key->pkt_bad, 0); return new_key; } @@ -656,14 +658,25 @@ 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; } @@ -683,8 +696,10 @@ tcp_inbound_ao_hash(struct sock *sk, const struct sk_buff *skb, u32 sne; 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; + } /* Fast-path */ /* TODO: fix fastopen and simultaneous open (TCPF_SYN_RECV) */ @@ -763,6 +778,8 @@ 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; } @@ -1416,6 +1433,8 @@ static int tcp_ao_add_cmd(struct sock *sk, unsigned short int family, key->keyflags = cmd.tcpa_keyflags; key->sndid = cmd.tcpa_sndid; key->rcvid = cmd.tcpa_rcvid; + atomic64_set(&key->pkt_good, 0); + atomic64_set(&key->pkt_bad, 0); ret = tcp_ao_parse_crypto(&cmd, key); if (ret < 0) -- 2.37.2