udp: Remove udp_table in struct udp_seq_afinfo.

Since UDP and UDP-Lite had dedicated socket hash tables for
each, we have had to fetch them from different pointers for
procfs or bpf iterator.

UDP always has its global or per-netns table in
net->ipv4.udp_table and struct udp_seq_afinfo.udp_table
is NULL.

OTOH, UDP-Lite had only one global table in the pointer.

We no longer use the field.

Let's remove it and udp_get_table_seq().

Signed-off-by: Kuniyuki Iwashima <kuniyu@google.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Link: https://patch.msgid.link/20260311052020.1213705-12-kuniyu@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

3 files changed, 4 insertions, 20 deletions

diff --git a/include/net/udp.h b/include/net/udp.h
index bc275cda9f8c..76f401988353 100644
--- a/include/net/udp.h
+++ b/include/net/udp.h
@@ -552,7 +552,6 @@ static inline int copy_linear_skb(struct sk_buff *skb, int len, int off,
 #ifdef CONFIG_PROC_FS
 struct udp_seq_afinfo {
 	sa_family_t			family;
-	struct udp_table		*udp_table;
 };
 
 struct udp_iter_state {
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index a7ca727347ce..14b372b211be 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -3194,19 +3194,6 @@ static bool seq_sk_match(struct seq_file *seq, const struct sock *sk)
 #ifdef CONFIG_BPF_SYSCALL
 static const struct seq_operations bpf_iter_udp_seq_ops;
 #endif
-static struct udp_table *udp_get_table_seq(struct seq_file *seq,
-					   struct net *net)
-{
-	const struct udp_seq_afinfo *afinfo;
-
-#ifdef CONFIG_BPF_SYSCALL
-	if (seq->op == &bpf_iter_udp_seq_ops)
-		return net->ipv4.udp_table;
-#endif
-
-	afinfo = pde_data(file_inode(seq->file));
-	return afinfo->udp_table ? : net->ipv4.udp_table;
-}
 
 static struct sock *udp_get_first(struct seq_file *seq, int start)
 {
@@ -3215,7 +3202,7 @@ static struct sock *udp_get_first(struct seq_file *seq, int start)
 	struct udp_table *udptable;
 	struct sock *sk;
 
-	udptable = udp_get_table_seq(seq, net);
+	udptable = net->ipv4.udp_table;
 
 	for (state->bucket = start; state->bucket <= udptable->mask;
 	     ++state->bucket) {
@@ -3247,7 +3234,7 @@ static struct sock *udp_get_next(struct seq_file *seq, struct sock *sk)
 	} while (sk && !seq_sk_match(seq, sk));
 
 	if (!sk) {
-		udptable = udp_get_table_seq(seq, net);
+		udptable = net->ipv4.udp_table;
 
 		if (state->bucket <= udptable->mask)
 			spin_unlock_bh(&udptable->hash[state->bucket].lock);
@@ -3295,7 +3282,7 @@ void udp_seq_stop(struct seq_file *seq, void *v)
 	struct udp_iter_state *state = seq->private;
 	struct udp_table *udptable;
 
-	udptable = udp_get_table_seq(seq, seq_file_net(seq));
+	udptable = seq_file_net(seq)->ipv4.udp_table;
 
 	if (state->bucket <= udptable->mask)
 		spin_unlock_bh(&udptable->hash[state->bucket].lock);
@@ -3399,7 +3386,7 @@ static struct sock *bpf_iter_udp_batch(struct seq_file *seq)
 	if (iter->cur_sk == iter->end_sk)
 		state->bucket++;
 
-	udptable = udp_get_table_seq(seq, net);
+	udptable = net->ipv4.udp_table;
 
 again:
 	/* New batch for the next bucket.
@@ -3637,7 +3624,6 @@ static const struct seq_operations udp_seq_ops = {
 
 static struct udp_seq_afinfo udp4_seq_afinfo = {
 	.family		= AF_INET,
-	.udp_table	= NULL,
 };
 
 static int __net_init udp4_proc_init_net(struct net *net)
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 5bddbf457b61..eeb77363a556 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -1872,7 +1872,6 @@ static const struct seq_operations udp6_seq_ops = {
 
 static struct udp_seq_afinfo udp6_seq_afinfo = {
 	.family		= AF_INET6,
-	.udp_table	= NULL,
 };
 
 int __net_init udp6_proc_init(struct net *net)