netdev - [PATCH net-next 1/4] sock: add sock

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Message-ID: <a26c04cba801be45ce01a41b6a14a871246177c5.1740643844.git.tanggeliang@kylinos.cn>
Date: Thu, 27 Feb 2025 16:23:23 +0800
From: Geliang Tang <geliang@...nel.org>
To: Eric Dumazet <edumazet@...gle.com>,
	Kuniyuki Iwashima <kuniyu@...zon.com>,
	Paolo Abeni <pabeni@...hat.com>,
	Willem de Bruijn <willemb@...gle.com>,
	"David S. Miller" <davem@...emloft.net>,
	Jakub Kicinski <kuba@...nel.org>,
	Simon Horman <horms@...nel.org>,
	Neal Cardwell <ncardwell@...gle.com>,
	David Ahern <dsahern@...nel.org>,
	Matthieu Baerts <matttbe@...nel.org>,
	Mat Martineau <martineau@...nel.org>,
	Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
	Xin Long <lucien.xin@...il.com>
Cc: Geliang Tang <tanggeliang@...inos.cn>,
	netdev@...r.kernel.org,
	mptcp@...ts.linux.dev,
	linux-sctp@...r.kernel.org
Subject: [PATCH net-next 1/4] sock: add sock_kmemdup helper

From: Geliang Tang <tanggeliang@...inos.cn>

This patch adds the sock version of kmemdup() helper, named sock_kmemdup(),
to duplicate the input "src" memory block using the socket's option memory
buffer.

Signed-off-by: Geliang Tang <tanggeliang@...inos.cn>
---
 include/net/sock.h |  2 ++
 net/core/sock.c    | 15 +++++++++++++++
 2 files changed, 17 insertions(+)

diff --git a/include/net/sock.h b/include/net/sock.h
index efc031163c33..1416c32c4695 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -1796,6 +1796,8 @@ static inline struct sk_buff *sock_alloc_send_skb(struct sock *sk,
 }
 
 void *sock_kmalloc(struct sock *sk, int size, gfp_t priority);
+void *sock_kmemdup(struct sock *sk, const void *src,
+		   int size, gfp_t priority);
 void sock_kfree_s(struct sock *sk, void *mem, int size);
 void sock_kzfree_s(struct sock *sk, void *mem, int size);
 void sk_send_sigurg(struct sock *sk);
diff --git a/net/core/sock.c b/net/core/sock.c
index 5ac445f8244b..95e81d24f4cc 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -2819,6 +2819,21 @@ void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
 }
 EXPORT_SYMBOL(sock_kmalloc);
 
+/*
+ * Duplicate the input "src" memory block using the socket's
+ * option memory buffer.
+ */
+void *sock_kmemdup(struct sock *sk, const void *src,
+		   int size, gfp_t priority)
+{
+	void *mem;
+
+	mem = sock_kmalloc(sk, size, priority);
+	if (mem)
+		memcpy(mem, src, size);
+	return mem;
+}
+
 /* Free an option memory block. Note, we actually want the inline
  * here as this allows gcc to detect the nullify and fold away the
  * condition entirely.
-- 
2.43.0