From: Geliang Tang <tanggeliang@xxxxxxxxxx>
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@xxxxxxxxxx>
---
include/net/sock.h | 2 ++
net/core/sock.c | 16 ++++++++++++++++
2 files changed, 18 insertions(+)
diff --git a/include/net/sock.h b/include/net/sock.h
index e771d99f81b0..8daf1b3b12c6 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -1797,6 +1797,8 @@ 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 23bce41f7f1f..a0598518ce89 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -2836,6 +2836,22 @@ 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;
+}
+EXPORT_SYMBOL(sock_kmemdup);
+
/* 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
