[PATCH net-next 1/4] sock: add sock_kmemdup helper
From: Geliang Tang <geliang@kernel.org>
Date: 2025-02-27 08:24:00
Also in:
linux-sctp, mptcp
Subsystem:
networking [general], networking [sockets], the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Kuniyuki Iwashima, Willem de Bruijn, Linus Torvalds
From: Geliang Tang <redacted> 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 <redacted> --- 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