From 59ae1d127ac0ae404baf414c434ba2651b793f46 Mon Sep 17 00:00:00 2001
From: Johannes Berg
Date: Fri, 16 Jun 2017 14:29:20 +0200
Subject: networking: introduce and use skb_put_data()

A common pattern with skb_put() is to just want to memcpy()
some data into the new space, introduce skb_put_data() for
this.

An spatch similar to the one for skb_put_zero() converts many
of the places using it:

    @@
    identifier p, p2;
    expression len, skb, data;
    type t, t2;
    @@
    (
    -p = skb_put(skb, len);
    +p = skb_put_data(skb, data, len);
    |
    -p = (t)skb_put(skb, len);
    +p = skb_put_data(skb, data, len);
    )
    (
    p2 = (t2)p;
    -memcpy(p2, data, len);
    |
    -memcpy(p, data, len);
    )

    @@
    type t, t2;
    identifier p, p2;
    expression skb, data;
    @@
    t *p;
    ...
    (
    -p = skb_put(skb, sizeof(t));
    +p = skb_put_data(skb, data, sizeof(t));
    |
    -p = (t *)skb_put(skb, sizeof(t));
    +p = skb_put_data(skb, data, sizeof(t));
    )
    (
    p2 = (t2)p;
    -memcpy(p2, data, sizeof(*p));
    |
    -memcpy(p, data, sizeof(*p));
    )

    @@
    expression skb, len, data;
    @@
    -memcpy(skb_put(skb, len), data, len);
    +skb_put_data(skb, data, len);

(again, manually post-processed to retain some comments)

Reviewed-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 net/key/af_key.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

(limited to 'net/key')

diff --git a/net/key/af_key.c b/net/key/af_key.c
index 8ad430edb5b8..3ebb4268973b 100644
--- a/net/key/af_key.c
+++ b/net/key/af_key.c
@@ -1706,8 +1706,7 @@ static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr)
 	if (!skb)
 		return -ENOBUFS;
 
-	hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
-	memcpy(hdr, ihdr, sizeof(struct sadb_msg));
+	hdr = skb_put_data(skb, ihdr, sizeof(struct sadb_msg));
 	hdr->sadb_msg_errno = (uint8_t) 0;
 	hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
 
-- 
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