netdev - [PATCH v1 net-next 11/13] udp: Set NULL to udp_seq_afinfo.udp

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Date:   Thu, 25 Aug 2022 17:04:43 -0700
From:   Kuniyuki Iwashima <kuniyu@...zon.com>
To:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Jeff Layton <jlayton@...nel.org>,
        Chuck Lever <chuck.lever@...cle.com>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Iurii Zaikin <yzaikin@...gle.com>
CC:     Kuniyuki Iwashima <kuniyu@...zon.com>,
        Kuniyuki Iwashima <kuni1840@...il.com>,
        <netdev@...r.kernel.org>, <linux-fsdevel@...r.kernel.org>
Subject: [PATCH v1 net-next 11/13] udp: Set NULL to udp_seq_afinfo.udp_table.

We will soon introduce an optional per-netns hash table
for UDP.

This means we cannot use the global udp_seq_afinfo.udp_table
to fetch a UDP hash table.

Instead, set NULL to udp_seq_afinfo.udp_table for UDP and get
a proper table from net->ipv4.udp_table.

Note that we still need udp_seq_afinfo.udp_table for UDP LITE.

Signed-off-by: Kuniyuki Iwashima <kuniyu@...zon.com>
---
 net/ipv4/udp.c | 32 ++++++++++++++++++++++++--------
 net/ipv6/udp.c |  2 +-
 2 files changed, 25 insertions(+), 9 deletions(-)

diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 1bfae1fbe682..17b4b175fc67 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -136,6 +136,12 @@ static struct udp_table *udp_get_table_prot(struct sock *sk)
 	return sk->sk_prot->h.udp_table ? : sock_net(sk)->ipv4.udp_table;
 }
 
+static struct udp_table *udp_get_table_afinfo(struct udp_seq_afinfo *afinfo,
+					      struct net *net)
+{
+	return afinfo->udp_table ? : net->ipv4.udp_table;
+}
+
 static int udp_lib_lport_inuse(struct net *net, __u16 num,
 			       const struct udp_hslot *hslot,
 			       unsigned long *bitmap,
@@ -2978,6 +2984,7 @@ static struct sock *udp_get_first(struct seq_file *seq, int start)
 	struct udp_iter_state *state = seq->private;
 	struct net *net = seq_file_net(seq);
 	struct udp_seq_afinfo *afinfo;
+	struct udp_table *udptable;
 	struct sock *sk;
 
 	if (state->bpf_seq_afinfo)
@@ -2985,9 +2992,11 @@ static struct sock *udp_get_first(struct seq_file *seq, int start)
 	else
 		afinfo = pde_data(file_inode(seq->file));
 
-	for (state->bucket = start; state->bucket <= afinfo->udp_table->mask;
+	udptable = udp_get_table_afinfo(afinfo, net);
+
+	for (state->bucket = start; state->bucket <= udptable->mask;
 	     ++state->bucket) {
-		struct udp_hslot *hslot = &afinfo->udp_table->hash[state->bucket];
+		struct udp_hslot *hslot = &udptable->hash[state->bucket];
 
 		if (hlist_empty(&hslot->head))
 			continue;
@@ -3012,6 +3021,7 @@ static struct sock *udp_get_next(struct seq_file *seq, struct sock *sk)
 	struct udp_iter_state *state = seq->private;
 	struct net *net = seq_file_net(seq);
 	struct udp_seq_afinfo *afinfo;
+	struct udp_table *udptable;
 
 	if (state->bpf_seq_afinfo)
 		afinfo = state->bpf_seq_afinfo;
@@ -3025,8 +3035,11 @@ static struct sock *udp_get_next(struct seq_file *seq, struct sock *sk)
 			 sk->sk_family != afinfo->family)));
 
 	if (!sk) {
-		if (state->bucket <= afinfo->udp_table->mask)
-			spin_unlock_bh(&afinfo->udp_table->hash[state->bucket].lock);
+		udptable = udp_get_table_afinfo(afinfo, net);
+
+		if (state->bucket <= udptable->mask)
+			spin_unlock_bh(&udptable->hash[state->bucket].lock);
+
 		return udp_get_first(seq, state->bucket + 1);
 	}
 	return sk;
@@ -3069,14 +3082,17 @@ void udp_seq_stop(struct seq_file *seq, void *v)
 {
 	struct udp_iter_state *state = seq->private;
 	struct udp_seq_afinfo *afinfo;
+	struct udp_table *udptable;
 
 	if (state->bpf_seq_afinfo)
 		afinfo = state->bpf_seq_afinfo;
 	else
 		afinfo = pde_data(file_inode(seq->file));
 
-	if (state->bucket <= afinfo->udp_table->mask)
-		spin_unlock_bh(&afinfo->udp_table->hash[state->bucket].lock);
+	udptable = udp_get_table_afinfo(afinfo, seq_file_net(seq));
+
+	if (state->bucket <= udptable->mask)
+		spin_unlock_bh(&udptable->hash[state->bucket].lock);
 }
 EXPORT_SYMBOL(udp_seq_stop);
 
@@ -3189,7 +3205,7 @@ EXPORT_SYMBOL(udp_seq_ops);
 
 static struct udp_seq_afinfo udp4_seq_afinfo = {
 	.family		= AF_INET,
-	.udp_table	= &udp_table,
+	.udp_table	= NULL,
 };
 
 static int __net_init udp4_proc_init_net(struct net *net)
@@ -3309,7 +3325,7 @@ static int bpf_iter_init_udp(void *priv_data, struct bpf_iter_aux_info *aux)
 		return -ENOMEM;
 
 	afinfo->family = AF_UNSPEC;
-	afinfo->udp_table = &udp_table;
+	afinfo->udp_table = NULL;
 	st->bpf_seq_afinfo = afinfo;
 	ret = bpf_iter_init_seq_net(priv_data, aux);
 	if (ret)
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 5dc069d5ad1e..8abf16c5a8a1 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -1697,7 +1697,7 @@ EXPORT_SYMBOL(udp6_seq_ops);
 
 static struct udp_seq_afinfo udp6_seq_afinfo = {
 	.family		= AF_INET6,
-	.udp_table	= &udp_table,
+	.udp_table	= NULL,
 };
 
 int __net_init udp6_proc_init(struct net *net)
-- 
2.30.2