From: Dmitry Safonov <dima@arista.com>
To: linux-kernel@vger.kernel.org, David Ahern <dsahern@kernel.org>,
Eric Dumazet <edumazet@google.com>,
Paolo Abeni <pabeni@redhat.com>, Jakub Kicinski <kuba@kernel.org>,
"David S. Miller" <davem@davemloft.net>
Cc: Dmitry Safonov <dima@arista.com>,
Andy Lutomirski <luto@amacapital.net>,
Ard Biesheuvel <ardb@kernel.org>,
Bob Gilligan <gilligan@arista.com>,
Dan Carpenter <dan.carpenter@oracle.com>,
David Laight <David.Laight@aculab.com>,
Dmitry Safonov <0x7f454c46@gmail.com>,
Eric Biggers <ebiggers@kernel.org>,
"Eric W. Biederman" <ebiederm@xmission.com>,
Francesco Ruggeri <fruggeri05@gmail.com>,
Herbert Xu <herbert@gondor.apana.org.au>,
Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>,
Ivan Delalande <colona@arista.com>,
Leonard Crestez <cdleonard@gmail.com>,
Salam Noureddine <noureddine@arista.com>,
netdev@vger.kernel.org, Francesco Ruggeri <fruggeri@arista.com>
Subject: [PATCH v4 15/21] net/tcp: Add tcp_hash_fail() ratelimited logs
Date: Wed, 15 Feb 2023 18:33:29 +0000 [thread overview]
Message-ID: <20230215183335.800122-16-dima@arista.com> (raw)
In-Reply-To: <20230215183335.800122-1-dima@arista.com>
Add a helper for logging connection-detailed messages for failed TCP
hash verification (both MD5 and AO).
Co-developed-by: Francesco Ruggeri <fruggeri@arista.com>
Signed-off-by: Francesco Ruggeri <fruggeri@arista.com>
Co-developed-by: Salam Noureddine <noureddine@arista.com>
Signed-off-by: Salam Noureddine <noureddine@arista.com>
Signed-off-by: Dmitry Safonov <dima@arista.com>
---
include/net/tcp.h | 14 ++++++++++++--
include/net/tcp_ao.h | 27 +++++++++++++++++++++++++++
net/ipv4/tcp.c | 23 +++++++++++++----------
net/ipv4/tcp_ao.c | 7 +++++++
4 files changed, 59 insertions(+), 12 deletions(-)
diff --git a/include/net/tcp.h b/include/net/tcp.h
index ff1680611530..7b1d8b05e3bc 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -2579,12 +2579,19 @@ tcp_inbound_hash(struct sock *sk, const struct request_sock *req,
int l3index;
/* Invalid option or two times meet any of auth options */
- if (tcp_parse_auth_options(th, &md5_location, &aoh))
+ if (tcp_parse_auth_options(th, &md5_location, &aoh)) {
+ tcp_hash_fail("TCP segment has incorrect auth options set",
+ family, skb, "");
return SKB_DROP_REASON_TCP_AUTH_HDR;
+ }
if (req) {
- if (tcp_rsk_used_ao(req) != !!aoh)
+ if (tcp_rsk_used_ao(req) != !!aoh) {
+ tcp_hash_fail("TCP connection can't start/end using TCP-AO",
+ family, skb, " %s",
+ !aoh ? "missing AO" : "AO signed");
return SKB_DROP_REASON_TCP_AOFAILURE;
+ }
}
/* sdif set, means packet ingressed via a device
@@ -2607,11 +2614,14 @@ tcp_inbound_hash(struct sock *sk, const struct request_sock *req,
lockdep_sock_is_held(sk));
NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPAOREQUIRED);
atomic64_inc(&ao_info->counters.ao_required);
+ tcp_hash_fail("AO hash is required, but not found",
+ family, skb, "");
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);
+ tcp_hash_fail("MD5 Hash not found", family, skb, "");
return SKB_DROP_REASON_TCP_MD5NOTFOUND;
}
return SKB_NOT_DROPPED_YET;
diff --git a/include/net/tcp_ao.h b/include/net/tcp_ao.h
index 07d05bb49e46..d953105f5f73 100644
--- a/include/net/tcp_ao.h
+++ b/include/net/tcp_ao.h
@@ -98,6 +98,33 @@ struct tcp_ao_info {
atomic_t refcnt; /* Protects twsk destruction */
};
+#define tcp_hash_fail(msg, family, skb, fmt, ...) \
+do { \
+ const struct tcphdr *th = tcp_hdr(skb); \
+ char hdr_flags[5] = {}; \
+ char *f = hdr_flags; \
+ \
+ if (th->fin) \
+ *f++ = 'F'; \
+ if (th->syn) \
+ *f++ = 'S'; \
+ if (th->rst) \
+ *f++ = 'R'; \
+ if (th->ack) \
+ *f = 'A'; \
+ if (family == AF_INET) { \
+ net_info_ratelimited("%s for (%pI4, %d)->(%pI4, %d) %s" fmt "\n", \
+ msg, &ip_hdr(skb)->saddr, ntohs(th->source), \
+ &ip_hdr(skb)->daddr, ntohs(th->dest), \
+ hdr_flags, ##__VA_ARGS__); \
+ } else { \
+ net_info_ratelimited("%s for [%pI6c]:%u->[%pI6c]:%u %s" fmt "\n", \
+ msg, &ipv6_hdr(skb)->saddr, ntohs(th->source), \
+ &ipv6_hdr(skb)->daddr, ntohs(th->dest), \
+ hdr_flags, ##__VA_ARGS__); \
+ } \
+} while (0)
+
#ifdef CONFIG_TCP_AO
/* TCP-AO structures and functions */
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 3a2caa5eeee2..d59e7422a481 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -4525,7 +4525,6 @@ tcp_inbound_md5_hash(const struct sock *sk, const struct sk_buff *skb,
* o MD5 hash and we're not expecting one.
* o MD5 hash and its wrong.
*/
- const struct tcphdr *th = tcp_hdr(skb);
struct tcp_sock *tp = tcp_sk(sk);
struct tcp_md5sig_key *key;
int genhash;
@@ -4535,6 +4534,7 @@ tcp_inbound_md5_hash(const struct sock *sk, const struct sk_buff *skb,
if (!key && hash_location) {
NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED);
+ tcp_hash_fail("Unexpected MD5 Hash found", family, skb, "");
return SKB_DROP_REASON_TCP_MD5UNEXPECTED;
}
@@ -4550,16 +4550,19 @@ tcp_inbound_md5_hash(const struct sock *sk, const struct sk_buff *skb,
if (genhash || memcmp(hash_location, newhash, 16) != 0) {
NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5FAILURE);
if (family == AF_INET) {
- net_info_ratelimited("MD5 Hash failed for (%pI4, %d)->(%pI4, %d)%s L3 index %d\n",
- saddr, ntohs(th->source),
- daddr, ntohs(th->dest),
- genhash ? " tcp_v4_calc_md5_hash failed"
- : "", l3index);
+ tcp_hash_fail("MD5 Hash failed", AF_INET, skb, "%s L3 index %d",
+ genhash ? " tcp_v4_calc_md5_hash failed"
+ : "", l3index);
} else {
- net_info_ratelimited("MD5 Hash %s for [%pI6c]:%u->[%pI6c]:%u L3 index %d\n",
- genhash ? "failed" : "mismatch",
- saddr, ntohs(th->source),
- daddr, ntohs(th->dest), l3index);
+ if (genhash) {
+ tcp_hash_fail("MD5 Hash failed",
+ AF_INET6, skb, " L3 index %d",
+ l3index);
+ } else {
+ tcp_hash_fail("MD5 Hash mismatch",
+ AF_INET6, skb, " L3 index %d",
+ l3index);
+ }
}
return SKB_DROP_REASON_TCP_MD5FAILURE;
}
diff --git a/net/ipv4/tcp_ao.c b/net/ipv4/tcp_ao.c
index d34ff3682cf8..6f650ebe01c4 100644
--- a/net/ipv4/tcp_ao.c
+++ b/net/ipv4/tcp_ao.c
@@ -693,6 +693,8 @@ tcp_ao_verify_hash(const struct sock *sk, const struct sk_buff *skb,
NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPAOBAD);
atomic64_inc(&info->counters.pkt_bad);
atomic64_inc(&key->pkt_bad);
+ tcp_hash_fail("AO hash wrong length", family, skb,
+ " %u != %d", maclen, tcp_ao_maclen(key));
return SKB_DROP_REASON_TCP_AOFAILURE;
}
@@ -703,6 +705,7 @@ tcp_ao_verify_hash(const struct sock *sk, const struct sk_buff *skb,
NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPAOBAD);
atomic64_inc(&info->counters.pkt_bad);
atomic64_inc(&key->pkt_bad);
+ tcp_hash_fail("AO hash mismatch", family, skb, "");
return SKB_DROP_REASON_TCP_AOFAILURE;
}
NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPAOGOOD);
@@ -728,6 +731,8 @@ tcp_inbound_ao_hash(struct sock *sk, const struct sk_buff *skb,
info = rcu_dereference(tcp_sk(sk)->ao_info);
if (!info) {
NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPAOKEYNOTFOUND);
+ tcp_hash_fail("AO key not found", family, skb,
+ " keyid: %u", aoh->keyid);
return SKB_DROP_REASON_TCP_AOUNEXPECTED;
}
@@ -824,6 +829,8 @@ tcp_inbound_ao_hash(struct sock *sk, const struct sk_buff *skb,
key_not_found:
NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPAOKEYNOTFOUND);
atomic64_inc(&info->counters.key_not_found);
+ tcp_hash_fail("Requested by the peer AO key id not found",
+ family, skb, "");
return SKB_DROP_REASON_TCP_AOKEYNOTFOUND;
}
--
2.39.1
next prev parent reply other threads:[~2023-02-15 18:36 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-02-15 18:33 [PATCH v4 00/21] net/tcp: Add TCP-AO support Dmitry Safonov
2023-02-15 18:33 ` [PATCH v4 01/21] net/tcp: Prepare tcp_md5sig_pool for TCP-AO Dmitry Safonov
2023-02-20 9:41 ` Herbert Xu
2023-02-20 16:57 ` Dmitry Safonov
2023-02-21 2:43 ` Herbert Xu
2023-02-21 14:52 ` Dmitry Safonov
2023-02-15 18:33 ` [PATCH v4 02/21] tcp: Add TCP-AO config and structures Dmitry Safonov
2023-02-15 18:33 ` [PATCH v4 03/21] net/tcp: Introduce TCP_AO setsockopt()s Dmitry Safonov
2023-02-15 18:33 ` [PATCH v4 04/21] net/tcp: Prevent TCP-MD5 with TCP-AO being set Dmitry Safonov
2023-02-15 18:33 ` [PATCH v4 05/21] net/tcp: Calculate TCP-AO traffic keys Dmitry Safonov
2023-02-15 22:50 ` kernel test robot
2023-02-15 18:33 ` [PATCH v4 06/21] net/tcp: Add TCP-AO sign to outgoing packets Dmitry Safonov
2023-02-15 18:33 ` [PATCH v4 07/21] net/tcp: Add tcp_parse_auth_options() Dmitry Safonov
2023-02-15 18:33 ` [PATCH v4 08/21] net/tcp: Add AO sign to RST packets Dmitry Safonov
2023-02-15 18:33 ` [PATCH v4 09/21] net/tcp: Add TCP-AO sign to twsk Dmitry Safonov
2023-02-15 18:33 ` [PATCH v4 10/21] net/tcp: Wire TCP-AO to request sockets Dmitry Safonov
2023-02-15 18:33 ` [PATCH v4 11/21] net/tcp: Sign SYN-ACK segments with TCP-AO Dmitry Safonov
2023-02-15 18:33 ` [PATCH v4 12/21] net/tcp: Verify inbound TCP-AO signed segments Dmitry Safonov
2023-02-16 0:22 ` kernel test robot
2023-02-15 18:33 ` [PATCH v4 13/21] net/tcp: Add TCP-AO segments counters Dmitry Safonov
2023-02-15 18:33 ` [PATCH v4 14/21] net/tcp: Add TCP-AO SNE support Dmitry Safonov
2023-02-15 18:33 ` Dmitry Safonov [this message]
2023-02-15 18:33 ` [PATCH v4 16/21] net/tcp: Ignore specific ICMPs for TCP-AO connections Dmitry Safonov
2023-02-15 18:33 ` [PATCH v4 17/21] net/tcp: Add option for TCP-AO to (not) hash header Dmitry Safonov
2023-02-15 18:33 ` [PATCH v4 18/21] net/tcp: Add getsockopt(TCP_AO_GET) Dmitry Safonov
2023-02-15 18:33 ` [PATCH v4 19/21] net/tcp: Allow asynchronous delete for TCP-AO keys (MKTs) Dmitry Safonov
2023-02-15 18:33 ` [PATCH v4 20/21] net/tcp-ao: Add static_key for TCP-AO Dmitry Safonov
2023-02-15 18:33 ` [PATCH v4 21/21] net/tcp-ao: Wire up l3index to TCP-AO Dmitry Safonov
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20230215183335.800122-16-dima@arista.com \
--to=dima@arista.com \
--cc=0x7f454c46@gmail.com \
--cc=David.Laight@aculab.com \
--cc=ardb@kernel.org \
--cc=cdleonard@gmail.com \
--cc=colona@arista.com \
--cc=dan.carpenter@oracle.com \
--cc=davem@davemloft.net \
--cc=dsahern@kernel.org \
--cc=ebiederm@xmission.com \
--cc=ebiggers@kernel.org \
--cc=edumazet@google.com \
--cc=fruggeri05@gmail.com \
--cc=fruggeri@arista.com \
--cc=gilligan@arista.com \
--cc=herbert@gondor.apana.org.au \
--cc=kuba@kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=luto@amacapital.net \
--cc=netdev@vger.kernel.org \
--cc=noureddine@arista.com \
--cc=pabeni@redhat.com \
--cc=yoshfuji@linux-ipv6.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).