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Miller" Cc: linux-kernel@vger.kernel.org, Dmitry Safonov , Andy Lutomirski , Ard Biesheuvel , Bob Gilligan , Dan Carpenter , David Laight , Dmitry Safonov <0x7f454c46@gmail.com>, Donald Cassidy , Eric Biggers , "Eric W. Biederman" , Francesco Ruggeri , "Gaillardetz, Dominik" , Herbert Xu , Hideaki YOSHIFUJI , Ivan Delalande , Leonard Crestez , Salam Noureddine , "Tetreault, Francois" , netdev@vger.kernel.org Subject: [PATCH v8.1 net-next 13/23] net/tcp: Add TCP-AO segments counters Date: Fri, 21 Jul 2023 17:19:04 +0100 Message-ID: <20230721161916.542667-14-dima@arista.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230721161916.542667-1-dima@arista.com> References: <20230721161916.542667-1-dima@arista.com> MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF, RCVD_IN_DNSWL_BLOCKED,SPF_HELO_NONE,SPF_NONE,T_SCC_BODY_TEXT_LINE, URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1772047969930447695 X-GMAIL-MSGID: 1772047969930447695 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-core.h | 15 +++++++++++---- include/net/tcp.h | 15 +++++++++++---- 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 | 30 +++++++++++++++++++++++++++--- net/ipv4/tcp_ipv4.c | 2 +- net/ipv6/tcp_ipv6.c | 4 ++-- 9 files changed, 77 insertions(+), 15 deletions(-) diff --git a/include/net/dropreason-core.h b/include/net/dropreason-core.h index 1de089ab73fd..f93ab108df4e 100644 --- a/include/net/dropreason-core.h +++ b/include/net/dropreason-core.h @@ -166,17 +166,24 @@ 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 6289ee642931..a58f95237ea3 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -2605,7 +2605,7 @@ 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; @@ -2617,8 +2617,13 @@ 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; } @@ -2640,8 +2645,10 @@ tcp_inbound_hash(struct sock *sk, const struct request_sock *req, return SKB_DROP_REASON_TCP_AUTH_HDR; if (req) { - if (tcp_rsk_used_ao(req) != !!aoh) + if (tcp_rsk_used_ao(req) != !!aoh) { + NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPAOBAD); return SKB_DROP_REASON_TCP_AOFAILURE; + } } /* sdif set, means packet ingressed via a device @@ -2656,7 +2663,7 @@ 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 1b7ca7bf93a3..0a02098bddeb 100644 --- a/include/net/tcp_ao.h +++ b/include/net/tcp_ao.h @@ -19,6 +19,13 @@ 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; @@ -34,6 +41,8 @@ struct tcp_ao_key { u8 rcvid; u8 maclen; struct rcu_head rcu; + atomic64_t pkt_good; + atomic64_t pkt_bad; u8 traffic_keys[]; }; @@ -82,6 +91,7 @@ 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 073be1680818..5ab66928a952 100644 --- a/net/ipv4/tcp_ao.c +++ b/net/ipv4/tcp_ao.c @@ -184,6 +184,8 @@ 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; } @@ -745,8 +747,12 @@ tcp_ao_verify_hash(const struct sock *sk, const struct sk_buff *skb, const struct tcphdr *th = tcp_hdr(skb); void *hash_buf = NULL; - 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; + } hash_buf = kmalloc(tcp_ao_digest_size(key), GFP_ATOMIC); if (!hash_buf) @@ -756,9 +762,15 @@ tcp_ao_verify_hash(const struct sock *sk, const struct sk_buff *skb, tcp_ao_hash_skb(family, hash_buf, key, sk, skb, traffic_key, (phash - (u8 *)th), sne); if (memcmp(phash, hash_buf, maclen)) { + NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPAOBAD); + atomic64_inc(&info->counters.pkt_bad); + atomic64_inc(&key->pkt_bad); kfree(hash_buf); 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); kfree(hash_buf); return SKB_NOT_DROPPED_YET; } @@ -778,8 +790,10 @@ 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; @@ -875,6 +889,8 @@ tcp_inbound_ao_hash(struct sock *sk, const struct sk_buff *skb, return ret; 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; } @@ -1460,6 +1476,8 @@ 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) @@ -1673,7 +1691,7 @@ 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 = setsockopt_ao_info(sk); @@ -1708,6 +1726,12 @@ 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 f09c0389ae11..d8d2499b5e26 100644 --- a/net/ipv4/tcp_ipv4.c +++ b/net/ipv4/tcp_ipv4.c @@ -1528,7 +1528,7 @@ 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 40266a3a99a6..c825d7c80f5b 100644 --- a/net/ipv6/tcp_ipv6.c +++ b/net/ipv6/tcp_ipv6.c @@ -660,7 +660,7 @@ 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, @@ -672,7 +672,7 @@ 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,