4 * Definitions for the CAN network socket buffer
6 * Copyright (C) 2012 Oliver Hartkopp <socketcan@hartkopp.net>
13 #include <linux/types.h>
14 #include <linux/skbuff.h>
15 #include <linux/can.h>
19 * The struct can_skb_priv is used to transport additional information along
20 * with the stored struct can(fd)_frame that can not be contained in existing
21 * struct sk_buff elements.
22 * N.B. that this information must not be modified in cloned CAN sk_buffs.
23 * To modify the CAN frame content or the struct can_skb_priv content
24 * skb_copy() needs to be used instead of skb_clone().
28 * struct can_skb_priv - private additional data inside CAN sk_buffs
29 * @ifindex: ifindex of the first interface the CAN frame appeared on
30 * @skbcnt: atomic counter to have an unique id together with skb pointer
31 * @cf: align to the following CAN frame at skb->data
36 struct can_frame cf
[0];
39 static inline struct can_skb_priv
*can_skb_prv(struct sk_buff
*skb
)
41 return (struct can_skb_priv
*)(skb
->head
);
44 static inline void can_skb_reserve(struct sk_buff
*skb
)
46 skb_reserve(skb
, sizeof(struct can_skb_priv
));
49 static inline void can_skb_set_owner(struct sk_buff
*skb
, struct sock
*sk
)
53 skb
->destructor
= sock_efree
;
59 * returns an unshared skb owned by the original sock to be echo'ed back
61 static inline struct sk_buff
*can_create_echo_skb(struct sk_buff
*skb
)
63 if (skb_shared(skb
)) {
64 struct sk_buff
*nskb
= skb_clone(skb
, GFP_ATOMIC
);
67 can_skb_set_owner(nskb
, skb
->sk
);
76 /* we can assume to have an unshared skb with proper owner */
80 #endif /* !_CAN_SKB_H */
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