From: Dmitry Safonov <dima@arista.com>
To: 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: linux-kernel@vger.kernel.org, Dmitry Safonov <dima@arista.com>,
Andy Lutomirski <luto@amacapital.net>,
Ard Biesheuvel <ardb@kernel.org>,
Bob Gilligan <gilligan@arista.com>,
Dan Carpenter <error27@gmail.com>,
David Laight <David.Laight@aculab.com>,
Dmitry Safonov <0x7f454c46@gmail.com>,
Donald Cassidy <dcassidy@redhat.com>,
Eric Biggers <ebiggers@kernel.org>,
"Eric W. Biederman" <ebiederm@xmission.com>,
Francesco Ruggeri <fruggeri05@gmail.com>,
"Gaillardetz, Dominik" <dgaillar@ciena.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>,
"Tetreault, Francois" <ftetreau@ciena.com>,
netdev@vger.kernel.org
Subject: [PATCH v8 20/23] net/tcp: Add static_key for TCP-AO
Date: Wed, 19 Jul 2023 21:26:25 +0100 [thread overview]
Message-ID: <20230719202631.472019-21-dima@arista.com> (raw)
In-Reply-To: <20230719202631.472019-1-dima@arista.com>
Similarly to TCP-MD5, add a static key to TCP-AO that is patched out
when there are no keys on a machine and dynamically enabled with the
first setsockopt(TCP_AO) adds a key on any socket. The static key is as
well dynamically disabled later when the socket is destructed.
The lifetime of enabled static key here is the same as ao_info: it is
enabled on allocation, passed over from full socket to twsk and
destructed when ao_info is scheduled for destruction.
Signed-off-by: Dmitry Safonov <dima@arista.com>
---
include/net/tcp.h | 3 +++
include/net/tcp_ao.h | 2 ++
net/ipv4/tcp_ao.c | 22 +++++++++++++++++++++
net/ipv4/tcp_input.c | 46 +++++++++++++++++++++++++++++---------------
4 files changed, 57 insertions(+), 16 deletions(-)
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 61dd9a8afaf1..a93591a4e42d 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -2580,6 +2580,9 @@ static inline bool tcp_ao_required(struct sock *sk, const void *saddr,
struct tcp_ao_info *ao_info;
struct tcp_ao_key *ao_key;
+ if (!static_branch_unlikely(&tcp_ao_needed.key))
+ return false;
+
ao_info = rcu_dereference_check(tcp_sk(sk)->ao_info,
lockdep_sock_is_held(sk));
if (!ao_info)
diff --git a/include/net/tcp_ao.h b/include/net/tcp_ao.h
index 9209343878e1..e6d849d7179e 100644
--- a/include/net/tcp_ao.h
+++ b/include/net/tcp_ao.h
@@ -152,6 +152,8 @@ do { \
#ifdef CONFIG_TCP_AO
/* TCP-AO structures and functions */
+#include <linux/jump_label.h>
+extern struct static_key_false_deferred tcp_ao_needed;
struct tcp4_ao_context {
__be32 saddr;
diff --git a/net/ipv4/tcp_ao.c b/net/ipv4/tcp_ao.c
index 567aa9400f7d..54b35ee1edf1 100644
--- a/net/ipv4/tcp_ao.c
+++ b/net/ipv4/tcp_ao.c
@@ -17,6 +17,8 @@
#include <net/ipv6.h>
#include <net/icmp.h>
+DEFINE_STATIC_KEY_DEFERRED_FALSE(tcp_ao_needed, HZ);
+
int tcp_ao_calc_traffic_key(struct tcp_ao_key *mkt, u8 *key, void *ctx,
unsigned int len, struct tcp_sigpool *hp)
{
@@ -50,6 +52,9 @@ bool tcp_ao_ignore_icmp(struct sock *sk, int type, int code)
struct tcp_ao_info *ao;
bool ignore_icmp = false;
+ if (!static_branch_unlikely(&tcp_ao_needed.key))
+ return false;
+
/* RFC5925, 7.8:
* >> A TCP-AO implementation MUST default to ignore incoming ICMPv4
* messages of Type 3 (destination unreachable), Codes 2-4 (protocol
@@ -188,6 +193,9 @@ static struct tcp_ao_key *__tcp_ao_do_lookup(const struct sock *sk,
struct tcp_ao_key *key;
struct tcp_ao_info *ao;
+ if (!static_branch_unlikely(&tcp_ao_needed.key))
+ return NULL;
+
ao = rcu_dereference_check(tcp_sk(sk)->ao_info,
lockdep_sock_is_held(sk));
if (!ao)
@@ -281,6 +289,7 @@ void tcp_ao_destroy_sock(struct sock *sk, bool twsk)
}
kfree_rcu(ao, rcu);
+ static_branch_slow_dec_deferred(&tcp_ao_needed);
}
void tcp_ao_time_wait(struct tcp_timewait_sock *tcptw, struct tcp_sock *tp)
@@ -1142,6 +1151,11 @@ int tcp_ao_copy_all_matching(const struct sock *sk, struct sock *newsk,
goto free_and_exit;
}
+ if (!static_key_fast_inc_not_disabled(&tcp_ao_needed.key.key)) {
+ ret = -EUSERS;
+ goto free_and_exit;
+ }
+
key_head = rcu_dereference(hlist_first_rcu(&new_ao->head));
first_key = hlist_entry_safe(key_head, struct tcp_ao_key, node);
@@ -1585,6 +1599,10 @@ static int tcp_ao_add_cmd(struct sock *sk, unsigned short int family,
tcp_ao_link_mkt(ao_info, key);
if (first) {
+ if (!static_branch_inc(&tcp_ao_needed.key)) {
+ ret = -EUSERS;
+ goto err_free_sock;
+ }
sk_gso_disable(sk);
rcu_assign_pointer(tcp_sk(sk)->ao_info, ao_info);
}
@@ -1850,6 +1868,10 @@ static int tcp_ao_info_cmd(struct sock *sk, unsigned short int family,
if (new_rnext)
WRITE_ONCE(ao_info->rnext_key, new_rnext);
if (first) {
+ if (!static_branch_inc(&tcp_ao_needed.key)) {
+ err = -EUSERS;
+ goto out;
+ }
sk_gso_disable(sk);
rcu_assign_pointer(tcp_sk(sk)->ao_info, ao_info);
}
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 63c2e42dc2d2..acf09124d6d0 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -3524,41 +3524,55 @@ static inline bool tcp_may_update_window(const struct tcp_sock *tp,
(ack_seq == tp->snd_wl1 && nwin > tp->snd_wnd);
}
-/* If we update tp->snd_una, also update tp->bytes_acked */
-static void tcp_snd_una_update(struct tcp_sock *tp, u32 ack)
+static void tcp_snd_sne_update(struct tcp_sock *tp, u32 ack)
{
- u32 delta = ack - tp->snd_una;
#ifdef CONFIG_TCP_AO
struct tcp_ao_info *ao;
-#endif
- sock_owned_by_me((struct sock *)tp);
- tp->bytes_acked += delta;
-#ifdef CONFIG_TCP_AO
+ if (!static_branch_unlikely(&tcp_ao_needed.key))
+ return;
+
ao = rcu_dereference_protected(tp->ao_info,
lockdep_sock_is_held((struct sock *)tp));
if (ao && ack < tp->snd_una)
ao->snd_sne++;
#endif
+}
+
+/* If we update tp->snd_una, also update tp->bytes_acked */
+static void tcp_snd_una_update(struct tcp_sock *tp, u32 ack)
+{
+ u32 delta = ack - tp->snd_una;
+
+ sock_owned_by_me((struct sock *)tp);
+ tp->bytes_acked += delta;
+ tcp_snd_sne_update(tp, ack);
tp->snd_una = ack;
}
+static void tcp_rcv_sne_update(struct tcp_sock *tp, u32 seq)
+{
+#ifdef CONFIG_TCP_AO
+ struct tcp_ao_info *ao;
+
+ if (!static_branch_unlikely(&tcp_ao_needed.key))
+ return;
+
+ ao = rcu_dereference_protected(tp->ao_info,
+ lockdep_sock_is_held((struct sock *)tp));
+ if (ao && seq < tp->rcv_nxt)
+ ao->rcv_sne++;
+#endif
+}
+
/* If we update tp->rcv_nxt, also update tp->bytes_received */
static void tcp_rcv_nxt_update(struct tcp_sock *tp, u32 seq)
{
u32 delta = seq - tp->rcv_nxt;
-#ifdef CONFIG_TCP_AO
- struct tcp_ao_info *ao;
-#endif
sock_owned_by_me((struct sock *)tp);
tp->bytes_received += delta;
-#ifdef CONFIG_TCP_AO
- ao = rcu_dereference_protected(tp->ao_info,
- lockdep_sock_is_held((struct sock *)tp));
- if (ao && seq < tp->rcv_nxt)
- ao->rcv_sne++;
-#endif
+ tcp_rcv_sne_update(tp, seq);
WRITE_ONCE(tp->rcv_nxt, seq);
}
--
2.41.0
next prev parent reply other threads:[~2023-07-19 20:27 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-07-19 20:26 [PATCH v8 00/23] net/tcp: Add TCP-AO support Dmitry Safonov
2023-07-19 20:26 ` [PATCH v8 01/23] net/tcp: Prepare tcp_md5sig_pool for TCP-AO Dmitry Safonov
2023-07-19 20:26 ` [PATCH v8 02/23] net/tcp: Add TCP-AO config and structures Dmitry Safonov
2023-07-19 20:26 ` [PATCH v8 03/23] net/tcp: Introduce TCP_AO setsockopt()s Dmitry Safonov
2023-07-19 20:26 ` [PATCH v8 04/23] net/tcp: Prevent TCP-MD5 with TCP-AO being set Dmitry Safonov
2023-07-19 20:26 ` [PATCH v8 05/23] net/tcp: Calculate TCP-AO traffic keys Dmitry Safonov
2023-07-19 20:26 ` [PATCH v8 06/23] net/tcp: Add TCP-AO sign to outgoing packets Dmitry Safonov
2023-07-19 20:26 ` [PATCH v8 07/23] net/tcp: Add tcp_parse_auth_options() Dmitry Safonov
2023-07-19 20:26 ` [PATCH v8 08/23] net/tcp: Add AO sign to RST packets Dmitry Safonov
2023-07-19 20:26 ` [PATCH v8 09/23] net/tcp: Add TCP-AO sign to twsk Dmitry Safonov
2023-07-19 20:26 ` [PATCH v8 10/23] net/tcp: Wire TCP-AO to request sockets Dmitry Safonov
2023-07-19 20:26 ` [PATCH v8 11/23] net/tcp: Sign SYN-ACK segments with TCP-AO Dmitry Safonov
2023-07-19 20:26 ` [PATCH v8 12/23] net/tcp: Verify inbound TCP-AO signed segments Dmitry Safonov
2023-07-19 20:26 ` [PATCH v8 13/23] net/tcp: Add TCP-AO segments counters Dmitry Safonov
2023-07-19 20:26 ` [PATCH v8 14/23] net/tcp: Add TCP-AO SNE support Dmitry Safonov
2023-07-19 20:26 ` [PATCH v8 15/23] net/tcp: Add tcp_hash_fail() ratelimited logs Dmitry Safonov
2023-07-19 20:26 ` [PATCH v8 16/23] net/tcp: Ignore specific ICMPs for TCP-AO connections Dmitry Safonov
2023-07-19 20:26 ` [PATCH v8 17/23] net/tcp: Add option for TCP-AO to (not) hash header Dmitry Safonov
2023-07-19 20:26 ` [PATCH v8 18/23] net/tcp: Add TCP-AO getsockopt()s Dmitry Safonov
2023-07-19 20:26 ` [PATCH v8 19/23] net/tcp: Allow asynchronous delete for TCP-AO keys (MKTs) Dmitry Safonov
2023-07-19 20:26 ` Dmitry Safonov [this message]
2023-07-19 20:26 ` [PATCH v8 21/23] net/tcp: Wire up l3index to TCP-AO Dmitry Safonov
2023-07-19 20:26 ` [PATCH v8 22/23] net/tcp: Add TCP_AO_REPAIR Dmitry Safonov
2023-07-19 20:26 ` [PATCH v8 23/23] Documentation/tcp: Add TCP-AO documentation Dmitry Safonov
2023-07-20 17:53 ` [PATCH v8 00/23] net/tcp: Add TCP-AO support Jakub Kicinski
2023-07-20 20:41 ` Dmitry Safonov
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