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Date: Tue, 26 Jul 2022 09:15:28 +0300
From: Leonard Crestez <cdleonard@...il.com>
To: David Ahern <dsahern@...nel.org>,
Eric Dumazet <edumazet@...gle.com>,
Philip Paeps <philip@...uble.is>
Cc: Dmitry Safonov <0x7f454c46@...il.com>,
Shuah Khan <shuah@...nel.org>,
"David S. Miller" <davem@...emloft.net>,
Herbert Xu <herbert@...dor.apana.org.au>,
Kuniyuki Iwashima <kuniyu@...zon.co.jp>,
Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
Jakub Kicinski <kuba@...nel.org>,
Yuchung Cheng <ycheng@...gle.com>,
Francesco Ruggeri <fruggeri@...sta.com>,
Mat Martineau <mathew.j.martineau@...ux.intel.com>,
Christoph Paasch <cpaasch@...le.com>,
Ivan Delalande <colona@...sta.com>,
Caowangbao <caowangbao@...wei.com>,
Priyaranjan Jha <priyarjha@...gle.com>, netdev@...r.kernel.org,
linux-crypto@...r.kernel.org, linux-kselftest@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH v6 26/26] tcp: authopt: Initial implementation of TCP_REPAIR_AUTHOPT
In order to support TCP_REPAIR for connections use RFC5925
Authentication Option add a sockopt to get/set ISN and SNE values.
Signed-off-by: Leonard Crestez <cdleonard@...il.com>
---
include/net/tcp_authopt.h | 2 ++
include/uapi/linux/tcp.h | 15 +++++++++++
net/ipv4/tcp.c | 23 +++++++++++++++++
net/ipv4/tcp_authopt.c | 53 +++++++++++++++++++++++++++++++++++++++
4 files changed, 93 insertions(+)
diff --git a/include/net/tcp_authopt.h b/include/net/tcp_authopt.h
index 4f83d8e54fef..fda6dc4b5d57 100644
--- a/include/net/tcp_authopt.h
+++ b/include/net/tcp_authopt.h
@@ -231,10 +231,12 @@ static inline void tcp_authopt_update_snd_sne(struct tcp_sock *tp, u32 seq)
lockdep_sock_is_held((struct sock *)tp));
if (info)
__tcp_authopt_update_snd_sne(tp, info, seq);
}
}
+int tcp_get_authopt_repair_val(struct sock *sk, struct tcp_authopt_repair *opt);
+int tcp_set_authopt_repair(struct sock *sk, sockptr_t optval, unsigned int optlen);
#else
static inline void tcp_authopt_clear(struct sock *sk)
{
}
static inline int tcp_authopt_openreq(struct sock *newsk,
diff --git a/include/uapi/linux/tcp.h b/include/uapi/linux/tcp.h
index 5ca8aa9d5e43..469a783ce32b 100644
--- a/include/uapi/linux/tcp.h
+++ b/include/uapi/linux/tcp.h
@@ -128,10 +128,11 @@ enum {
#define TCP_CM_INQ TCP_INQ
#define TCP_TX_DELAY 37 /* delay outgoing packets by XX usec */
#define TCP_AUTHOPT 38 /* TCP Authentication Option (RFC5925) */
#define TCP_AUTHOPT_KEY 39 /* TCP Authentication Option Key (RFC5925) */
+#define TCP_REPAIR_AUTHOPT 40
#define TCP_REPAIR_ON 1
#define TCP_REPAIR_OFF 0
#define TCP_REPAIR_OFF_NO_WP -1 /* Turn off without window probes */
@@ -490,10 +491,24 @@ struct tcp_authopt_key {
* address match is performed.
*/
int prefixlen;
};
+/**
+ * struct tcp_authopt_repair - TCP_REPAIR information related to Authentication Option
+ * @src_isn: Local Initial Sequence Number
+ * @dst_isn: Remote Initial Sequence Number
+ * @snd_sne: Sequence Number Extension for Send (upper 32 bits of snd_nxt)
+ * @rcv_sne: Sequence Number Extension for Recv (upper 32 bits of rcv_nxt)
+ */
+struct tcp_authopt_repair {
+ __u32 src_isn;
+ __u32 dst_isn;
+ __u32 snd_sne;
+ __u32 rcv_sne;
+};
+
/* setsockopt(fd, IPPROTO_TCP, TCP_ZEROCOPY_RECEIVE, ...) */
#define TCP_RECEIVE_ZEROCOPY_FLAG_TLB_CLEAN_HINT 0x1
struct tcp_zerocopy_receive {
__u64 address; /* in: address of mapping */
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 2460bff936c6..3e135c4ca23d 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -3675,10 +3675,13 @@ static int do_tcp_setsockopt(struct sock *sk, int level, int optname,
err = tcp_set_authopt(sk, optval, optlen);
break;
case TCP_AUTHOPT_KEY:
err = tcp_set_authopt_key(sk, optval, optlen);
break;
+ case TCP_REPAIR_AUTHOPT:
+ err = tcp_set_authopt_repair(sk, optval, optlen);
+ break;
#endif
case TCP_USER_TIMEOUT:
/* Cap the max time in ms TCP will retry or probe the window
* before giving up and aborting (ETIMEDOUT) a connection.
*/
@@ -4347,10 +4350,30 @@ static int do_tcp_getsockopt(struct sock *sk, int level,
return -EFAULT;
if (copy_to_user(optval, &info, len))
return -EFAULT;
return 0;
}
+ case TCP_REPAIR_AUTHOPT: {
+ struct tcp_authopt_repair val;
+ int err;
+
+ if (get_user(len, optlen))
+ return -EFAULT;
+
+ lock_sock(sk);
+ err = tcp_get_authopt_repair_val(sk, &val);
+ release_sock(sk);
+
+ if (err)
+ return err;
+ len = min_t(unsigned int, len, sizeof(val));
+ if (put_user(len, optlen))
+ return -EFAULT;
+ if (copy_to_user(optval, &val, len))
+ return -EFAULT;
+ return 0;
+ }
#endif
default:
return -ENOPROTOOPT;
}
diff --git a/net/ipv4/tcp_authopt.c b/net/ipv4/tcp_authopt.c
index c71f5ed5ca1d..c3b001905296 100644
--- a/net/ipv4/tcp_authopt.c
+++ b/net/ipv4/tcp_authopt.c
@@ -682,10 +682,63 @@ int tcp_get_authopt_val(struct sock *sk, struct tcp_authopt *opt)
opt->recv_rnextkeyid = info->recv_rnextkeyid;
return 0;
}
+int tcp_get_authopt_repair_val(struct sock *sk, struct tcp_authopt_repair *opt)
+{
+ struct tcp_sock *tp = tcp_sk(sk);
+ struct tcp_authopt_info *info;
+ int err;
+
+ memset(opt, 0, sizeof(*opt));
+ sock_owned_by_me(sk);
+ err = check_sysctl_tcp_authopt();
+ if (err)
+ return err;
+
+ info = rcu_dereference_check(tp->authopt_info, lockdep_sock_is_held(sk));
+ if (!info)
+ return -ENOENT;
+
+ opt->dst_isn = info->dst_isn;
+ opt->src_isn = info->src_isn;
+ opt->rcv_sne = info->rcv_sne;
+ opt->snd_sne = info->snd_sne;
+
+ return 0;
+}
+
+int tcp_set_authopt_repair(struct sock *sk, sockptr_t optval, unsigned int optlen)
+{
+ struct tcp_sock *tp = tcp_sk(sk);
+ struct tcp_authopt_info *info;
+ struct tcp_authopt_repair val;
+ int err;
+
+ sock_owned_by_me(sk);
+ err = check_sysctl_tcp_authopt();
+ if (err)
+ return err;
+
+ if (optlen != sizeof(val))
+ return -EFAULT;
+ if (copy_from_sockptr(&val, optval, sizeof(val)))
+ return -EFAULT;
+
+ info = rcu_dereference_check(tp->authopt_info, lockdep_sock_is_held(sk));
+ if (!info)
+ return -ENOENT;
+
+ info->dst_isn = val.dst_isn;
+ info->src_isn = val.src_isn;
+ info->rcv_sne = val.rcv_sne;
+ info->snd_sne = val.snd_sne;
+
+ return 0;
+}
+
#define TCP_AUTHOPT_KEY_KNOWN_FLAGS ( \
TCP_AUTHOPT_KEY_DEL | \
TCP_AUTHOPT_KEY_EXCLUDE_OPTS | \
TCP_AUTHOPT_KEY_ADDR_BIND | \
TCP_AUTHOPT_KEY_IFINDEX | \
--
2.25.1
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