These inet_diag functions required struct inet_hashinfo because
they are shared by TCP and DCCP:

  * inet_diag_dump_icsk()
  * inet_diag_dump_one_icsk()
  * inet_diag_find_one_icsk()

DCCP has gone, and we don't need to pass hashinfo down to them.

Let's fetch net->ipv4.tcp_death_row.hashinfo directly in the first
2 functions.

Note that inet_diag_find_one_icsk() don't need hashinfo since the
previous patch.

We will move TCP-specific functions to tcp_diag.c in the next patch.

Signed-off-by: Kuniyuki Iwashima <kuniyu@google.com>
---
 include/linux/inet_diag.h |  6 ++----
 net/ipv4/inet_diag.c      | 10 +++++-----
 net/ipv4/tcp_diag.c       | 17 +++--------------
 3 files changed, 10 insertions(+), 23 deletions(-)

diff --git a/include/linux/inet_diag.h b/include/linux/inet_diag.h
index a9033696b0aa..34de992b5bd9 100644
--- a/include/linux/inet_diag.h
+++ b/include/linux/inet_diag.h
@@ -48,15 +48,13 @@ int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
 		      struct sk_buff *skb, struct netlink_callback *cb,
 		      const struct inet_diag_req_v2 *req,
 		      u16 nlmsg_flags, bool net_admin);
-void inet_diag_dump_icsk(struct inet_hashinfo *h, struct sk_buff *skb,
+void inet_diag_dump_icsk(struct sk_buff *skb,
 			 struct netlink_callback *cb,
 			 const struct inet_diag_req_v2 *r);
-int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo,
-			    struct netlink_callback *cb,
+int inet_diag_dump_one_icsk(struct netlink_callback *cb,
 			    const struct inet_diag_req_v2 *req);
 
 struct sock *inet_diag_find_one_icsk(struct net *net,
-				     struct inet_hashinfo *hashinfo,
 				     const struct inet_diag_req_v2 *req);
 
 int inet_diag_bc_sk(const struct nlattr *_bc, struct sock *sk);
diff --git a/net/ipv4/inet_diag.c b/net/ipv4/inet_diag.c
index 9d909734cf8a..fa4175b7f202 100644
--- a/net/ipv4/inet_diag.c
+++ b/net/ipv4/inet_diag.c
@@ -519,7 +519,6 @@ static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
 }
 
 struct sock *inet_diag_find_one_icsk(struct net *net,
-				     struct inet_hashinfo *hashinfo,
 				     const struct inet_diag_req_v2 *req)
 {
 	struct sock *sk;
@@ -562,8 +561,7 @@ struct sock *inet_diag_find_one_icsk(struct net *net,
 }
 EXPORT_SYMBOL_GPL(inet_diag_find_one_icsk);
 
-int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo,
-			    struct netlink_callback *cb,
+int inet_diag_dump_one_icsk(struct netlink_callback *cb,
 			    const struct inet_diag_req_v2 *req)
 {
 	struct sk_buff *in_skb = cb->skb;
@@ -573,7 +571,7 @@ int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo,
 	struct sock *sk;
 	int err;
 
-	sk = inet_diag_find_one_icsk(net, hashinfo, req);
+	sk = inet_diag_find_one_icsk(net, req);
 	if (IS_ERR(sk))
 		return PTR_ERR(sk);
 
@@ -1018,7 +1016,7 @@ static void twsk_build_assert(void)
 #endif
 }
 
-void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
+void inet_diag_dump_icsk(struct sk_buff *skb,
 			 struct netlink_callback *cb,
 			 const struct inet_diag_req_v2 *r)
 {
@@ -1026,10 +1024,12 @@ void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
 	struct inet_diag_dump_data *cb_data = cb->data;
 	struct net *net = sock_net(skb->sk);
 	u32 idiag_states = r->idiag_states;
+	struct inet_hashinfo *hashinfo;
 	int i, num, s_i, s_num;
 	struct nlattr *bc;
 	struct sock *sk;
 
+	hashinfo = net->ipv4.tcp_death_row.hashinfo;
 	bc = cb_data->inet_diag_nla_bc;
 	if (idiag_states & TCPF_SYN_RECV)
 		idiag_states |= TCPF_NEW_SYN_RECV;
diff --git a/net/ipv4/tcp_diag.c b/net/ipv4/tcp_diag.c
index 45e174b8cd22..7cd9d032efdd 100644
--- a/net/ipv4/tcp_diag.c
+++ b/net/ipv4/tcp_diag.c
@@ -180,21 +180,13 @@ static size_t tcp_diag_get_aux_size(struct sock *sk, bool net_admin)
 static void tcp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
 			  const struct inet_diag_req_v2 *r)
 {
-	struct inet_hashinfo *hinfo;
-
-	hinfo = sock_net(cb->skb->sk)->ipv4.tcp_death_row.hashinfo;
-
-	inet_diag_dump_icsk(hinfo, skb, cb, r);
+	inet_diag_dump_icsk(skb, cb, r);
 }
 
 static int tcp_diag_dump_one(struct netlink_callback *cb,
 			     const struct inet_diag_req_v2 *req)
 {
-	struct inet_hashinfo *hinfo;
-
-	hinfo = sock_net(cb->skb->sk)->ipv4.tcp_death_row.hashinfo;
-
-	return inet_diag_dump_one_icsk(hinfo, cb, req);
+	return inet_diag_dump_one_icsk(cb, req);
 }
 
 #ifdef CONFIG_INET_DIAG_DESTROY
@@ -202,13 +194,10 @@ static int tcp_diag_destroy(struct sk_buff *in_skb,
 			    const struct inet_diag_req_v2 *req)
 {
 	struct net *net = sock_net(in_skb->sk);
-	struct inet_hashinfo *hinfo;
 	struct sock *sk;
 	int err;
 
-	hinfo = net->ipv4.tcp_death_row.hashinfo;
-	sk = inet_diag_find_one_icsk(net, hinfo, req);
-
+	sk = inet_diag_find_one_icsk(net, req);
 	if (IS_ERR(sk))
 		return PTR_ERR(sk);
 
-- 
2.51.0.rc2.233.g662b1ed5c5-goog