From: Leonard Crestez <cdleonard@gmail.com>
To: David Ahern <dsahern@kernel.org>, Shuah Khan <shuah@kernel.org>,
Dmitry Safonov <0x7f454c46@gmail.com>,
Eric Dumazet <edumazet@google.com>
Cc: "David S. Miller" <davem@davemloft.net>,
Herbert Xu <herbert@gondor.apana.org.au>,
Kuniyuki Iwashima <kuniyu@amazon.co.jp>,
Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>,
Jakub Kicinski <kuba@kernel.org>,
Yuchung Cheng <ycheng@google.com>,
Francesco Ruggeri <fruggeri@arista.com>,
Mat Martineau <mathew.j.martineau@linux.intel.com>,
Christoph Paasch <cpaasch@apple.com>,
Ivan Delalande <colona@arista.com>,
Priyaranjan Jha <priyarjha@google.com>,
netdev@vger.kernel.org, linux-crypto@vger.kernel.org,
linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH v2 12/25] tcp: ipv6: Add AO signing for tcp_v6_send_response
Date: Mon, 1 Nov 2021 18:34:47 +0200 [thread overview]
Message-ID: <f9ff27ecc4aabd8ed89d5dfe5195c9cda1e7dc9f.1635784253.git.cdleonard@gmail.com> (raw)
In-Reply-To: <cover.1635784253.git.cdleonard@gmail.com>
This is a special code path for acks and resets outside of normal
connection establishment and closing.
Signed-off-by: Leonard Crestez <cdleonard@gmail.com>
---
net/ipv4/tcp_authopt.c | 2 ++
net/ipv6/tcp_ipv6.c | 38 ++++++++++++++++++++++++++++++++++++++
2 files changed, 40 insertions(+)
diff --git a/net/ipv4/tcp_authopt.c b/net/ipv4/tcp_authopt.c
index a48b741c83e4..c9d201d8f7a7 100644
--- a/net/ipv4/tcp_authopt.c
+++ b/net/ipv4/tcp_authopt.c
@@ -296,10 +296,11 @@ struct tcp_authopt_key_info *__tcp_authopt_select_key(const struct sock *sk,
const struct sock *addr_sk,
u8 *rnextkeyid)
{
return tcp_authopt_lookup_send(info, addr_sk, -1);
}
+EXPORT_SYMBOL(__tcp_authopt_select_key);
static struct tcp_authopt_info *__tcp_authopt_info_get_or_create(struct sock *sk)
{
struct tcp_sock *tp = tcp_sk(sk);
struct tcp_authopt_info *info;
@@ -1202,10 +1203,11 @@ int tcp_authopt_hash(char *hash_location,
* try to make it obvious inside the packet.
*/
memset(hash_location, 0, TCP_AUTHOPT_MACLEN);
return err;
}
+EXPORT_SYMBOL(tcp_authopt_hash);
static struct tcp_authopt_key_info *tcp_authopt_lookup_recv(struct sock *sk,
struct sk_buff *skb,
struct tcp_authopt_info *info,
int recv_id)
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 96a29caf56c7..68f9545e4347 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -902,13 +902,37 @@ static void tcp_v6_send_response(const struct sock *sk, struct sk_buff *skb, u32
struct sock *ctl_sk = net->ipv6.tcp_sk;
unsigned int tot_len = sizeof(struct tcphdr);
__be32 mrst = 0, *topt;
struct dst_entry *dst;
__u32 mark = 0;
+#ifdef CONFIG_TCP_AUTHOPT
+ struct tcp_authopt_info *authopt_info = NULL;
+ struct tcp_authopt_key_info *authopt_key_info = NULL;
+ u8 authopt_rnextkeyid;
+#endif
if (tsecr)
tot_len += TCPOLEN_TSTAMP_ALIGNED;
+#ifdef CONFIG_TCP_AUTHOPT
+ /* Key lookup before SKB allocation */
+ if (static_branch_unlikely(&tcp_authopt_needed) && sk) {
+ if (sk->sk_state == TCP_TIME_WAIT)
+ authopt_info = tcp_twsk(sk)->tw_authopt_info;
+ else
+ authopt_info = rcu_dereference(tcp_sk(sk)->authopt_info);
+
+ if (authopt_info) {
+ authopt_key_info = __tcp_authopt_select_key(sk, authopt_info, sk,
+ &authopt_rnextkeyid);
+ if (authopt_key_info) {
+ tot_len += TCPOLEN_AUTHOPT_OUTPUT;
+ /* Don't use MD5 */
+ key = NULL;
+ }
+ }
+ }
+#endif
#ifdef CONFIG_TCP_MD5SIG
if (key)
tot_len += TCPOLEN_MD5SIG_ALIGNED;
#endif
@@ -961,10 +985,24 @@ static void tcp_v6_send_response(const struct sock *sk, struct sk_buff *skb, u32
tcp_v6_md5_hash_hdr((__u8 *)topt, key,
&ipv6_hdr(skb)->saddr,
&ipv6_hdr(skb)->daddr, t1);
}
#endif
+#ifdef CONFIG_TCP_AUTHOPT
+ /* Compute the TCP-AO mac. Unlike in the ipv4 case we have a real SKB */
+ if (static_branch_unlikely(&tcp_authopt_needed) && authopt_key_info) {
+ *topt++ = htonl((TCPOPT_AUTHOPT << 24) |
+ (TCPOLEN_AUTHOPT_OUTPUT << 16) |
+ (authopt_key_info->send_id << 8) |
+ (authopt_rnextkeyid));
+ tcp_authopt_hash((char *)topt,
+ authopt_key_info,
+ authopt_info,
+ (struct sock *)sk,
+ buff);
+ }
+#endif
memset(&fl6, 0, sizeof(fl6));
fl6.daddr = ipv6_hdr(skb)->saddr;
fl6.saddr = ipv6_hdr(skb)->daddr;
fl6.flowlabel = label;
--
2.25.1
next prev parent reply other threads:[~2021-11-01 16:36 UTC|newest]
Thread overview: 55+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-01 16:34 [PATCH v2] tcp: Initial support for RFC5925 auth option Leonard Crestez
2021-11-01 16:34 ` [PATCH v2 01/25] tcp: authopt: Initial support and key management Leonard Crestez
2021-11-03 2:29 ` David Ahern
2021-11-05 12:10 ` Leonard Crestez
2021-11-05 1:22 ` Dmitry Safonov
2021-11-05 7:04 ` Leonard Crestez
2021-11-05 14:50 ` Dmitry Safonov
2021-11-05 18:00 ` Leonard Crestez
2021-11-01 16:34 ` [PATCH v2 02/25] docs: Add user documentation for tcp_authopt Leonard Crestez
2021-11-01 16:34 ` [PATCH v2 03/25] selftests: Initial tcp_authopt test module Leonard Crestez
2021-11-01 16:34 ` [PATCH v2 04/25] selftests: tcp_authopt: Initial sockopt manipulation Leonard Crestez
2021-11-01 16:34 ` [PATCH v2 05/25] tcp: authopt: Add crypto initialization Leonard Crestez
2021-11-01 16:34 ` [PATCH v2 06/25] tcp: authopt: Compute packet signatures Leonard Crestez
2021-11-05 1:53 ` Dmitry Safonov
2021-11-05 6:39 ` Leonard Crestez
2021-11-05 2:08 ` Dmitry Safonov
2021-11-05 6:09 ` Leonard Crestez
2021-11-01 16:34 ` [PATCH v2 07/25] tcp: Use BIT() for OPTION_* constants Leonard Crestez
2021-11-03 2:31 ` David Ahern
2021-11-03 22:19 ` Leonard Crestez
2021-11-01 16:34 ` [PATCH v2 08/25] tcp: authopt: Hook into tcp core Leonard Crestez
2021-11-01 16:34 ` [PATCH v2 09/25] tcp: authopt: Disable via sysctl by default Leonard Crestez
2021-11-03 2:39 ` David Ahern
2021-11-05 8:50 ` Leonard Crestez
2021-11-05 1:46 ` Dmitry Safonov
2021-11-01 16:34 ` [PATCH v2 10/25] selftests: tcp_authopt: Test key address binding Leonard Crestez
2021-11-01 16:34 ` [PATCH v2 11/25] tcp: authopt: Implement Sequence Number Extension Leonard Crestez
2021-11-01 19:22 ` Francesco Ruggeri
2021-11-02 10:03 ` Leonard Crestez
2021-11-02 19:21 ` Francesco Ruggeri
2021-11-03 22:01 ` Leonard Crestez
2021-11-01 20:54 ` Eric Dumazet
2021-11-02 9:50 ` Leonard Crestez
2021-11-01 16:34 ` Leonard Crestez [this message]
2021-11-03 2:44 ` [PATCH v2 12/25] tcp: ipv6: Add AO signing for tcp_v6_send_response David Ahern
2021-11-03 22:09 ` Leonard Crestez
2021-11-01 16:34 ` [PATCH v2 13/25] tcp: authopt: Add support for signing skb-less replies Leonard Crestez
2021-11-01 16:34 ` [PATCH v2 14/25] tcp: ipv4: Add AO signing for " Leonard Crestez
2021-11-01 16:34 ` [PATCH v2 15/25] selftests: tcp_authopt: Implement SNE in python Leonard Crestez
2021-11-01 16:34 ` [PATCH v2 16/25] selftests: tcp_authopt: Add scapy-based packet signing code Leonard Crestez
2021-11-01 16:34 ` [PATCH v2 17/25] selftests: tcp_authopt: Add packet-level tests Leonard Crestez
2021-11-01 16:34 ` [PATCH v2 18/25] selftests: tcp_authopt: Initial sne test Leonard Crestez
2021-11-01 16:34 ` [PATCH v2 19/25] tcp: authopt: Add key selection controls Leonard Crestez
2021-11-01 16:34 ` [PATCH v2 20/25] selftests: tcp_authopt: Add tests for rollover Leonard Crestez
2021-11-01 16:34 ` [PATCH v2 21/25] tcp: authopt: Add initial l3index support Leonard Crestez
2021-11-03 3:06 ` David Ahern
2021-11-05 12:26 ` Leonard Crestez
2021-11-01 16:34 ` [PATCH v2 22/25] selftests: tcp_authopt: Initial tests for l3mdev handling Leonard Crestez
2021-11-01 16:34 ` [PATCH v2 23/25] selftests: nettest: Rename md5_prefix to key_addr_prefix Leonard Crestez
2021-11-03 3:08 ` David Ahern
2021-11-01 16:34 ` [PATCH v2 24/25] selftests: nettest: Initial tcp_authopt support Leonard Crestez
2021-11-03 3:09 ` David Ahern
2021-11-01 16:35 ` [PATCH v2 25/25] selftests: net/fcnal: " Leonard Crestez
2021-11-03 3:18 ` [PATCH v2] tcp: Initial support for RFC5925 auth option David Ahern
2021-11-03 22:22 ` Leonard Crestez
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