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sock: add sock_kmemdup helper

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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@kylinos.cn>
Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Acked-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Link: https://patch.msgid.link/f828077394c7d1f3560123497348b438c875b510.1740735165.git.tanggeliang@kylinos.cn
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Geliang Tang 2025-02-28 18:01:31 +08:00 • committed by Jakub Kicinski
parent b84c523997
commit 456cc675b6
2 changed files with 18 additions and 0 deletions
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2
include/net/sock.h
View file

@ -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);

16
net/core/sock.c
View file

@ -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.