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net: use common macro for assering skb->cb[] available size in protocol families

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As part of an effort to move skb->dropcount to skb->cb[] use a common
macro in protocol families using skb->cb[] for ancillary data to
validate available room in skb->cb[].

Signed-off-by: Eyal Birger <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Eyal Birger 2015-03-01 14:58:29 +02:00 • committed by David S. Miller
commit b4772ef879
9 changed files with 13 additions and 14 deletions
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2
net/can/bcm.c
View file

@ -328,7 +328,7 @@ static void bcm_send_to_user(struct bcm_op *op, struct bcm_msg_head *head,
* containing the interface index.
*/
BUILD_BUG_ON(sizeof(skb->cb) < sizeof(struct sockaddr_can));
sock_skb_cb_check_size(sizeof(struct sockaddr_can));
addr = (struct sockaddr_can *)skb->cb;
memset(addr, 0, sizeof(*addr));
addr->can_family = AF_CAN;

6
net/can/raw.c
View file

@ -95,8 +95,8 @@ struct raw_sock {
*/
static inline unsigned int *raw_flags(struct sk_buff *skb)
{
BUILD_BUG_ON(sizeof(skb->cb) <= (sizeof(struct sockaddr_can) +
sizeof(unsigned int)));
sock_skb_cb_check_size(sizeof(struct sockaddr_can) +
sizeof(unsigned int));
/* return pointer after struct sockaddr_can */
return (unsigned int *)(&((struct sockaddr_can *)skb->cb)[1]);
@ -135,7 +135,7 @@ static void raw_rcv(struct sk_buff *oskb, void *data)
* containing the interface index.
*/
BUILD_BUG_ON(sizeof(skb->cb) < sizeof(struct sockaddr_can));
sock_skb_cb_check_size(sizeof(struct sockaddr_can));
addr = (struct sockaddr_can *)skb->cb;
memset(addr, 0, sizeof(*addr));
addr->can_family = AF_CAN;