Commit 456cc675 authored by Geliang Tang's avatar Geliang Tang Committed by Jakub Kicinski
Browse files

sock: add sock_kmemdup helper 



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: default avatarGeliang Tang <tanggeliang@kylinos.cn>
Reviewed-by: default avatarKuniyuki Iwashima <kuniyu@amazon.com>
Acked-by: default avatarMatthieu Baerts (NGI0) <matttbe@kernel.org>
Link: https://patch.msgid.link/f828077394c7d1f3560123497348b438c875b510.1740735165.git.tanggeliang@kylinos.cn


Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parent b84c5239

include/net/sock.h

+2 −0
Original line number Diff line number Diff line
@@ -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);

net/core/sock.c

+16 −0
Original line number Diff line number Diff line
@@ -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.