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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146/* SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause) *//* * linux/can/skb.h * * Definitions for the CAN network socket buffer * * Copyright (C) 2012 Oliver Hartkopp <socketcan@hartkopp.net> * */
#ifndef _CAN_SKB_H#define _CAN_SKB_H
#include <linux/types.h>#include <linux/skbuff.h>#include <linux/can.h>#include <net/can.h>#include <net/sock.h>
void can_flush_echo_skb(struct net_device *dev);int can_put_echo_skb(struct sk_buff *skb, struct net_device *dev, unsigned int idx, unsigned int frame_len);struct sk_buff *__can_get_echo_skb(struct net_device *dev, unsigned int idx, unsigned int *len_ptr, unsigned int *frame_len_ptr);unsigned int __must_check can_get_echo_skb(struct net_device *dev, unsigned int idx, unsigned int *frame_len_ptr);void can_free_echo_skb(struct net_device *dev, unsigned int idx, unsigned int *frame_len_ptr);struct sk_buff *alloc_can_skb(struct net_device *dev, struct can_frame **cf);struct sk_buff *alloc_canfd_skb(struct net_device *dev, struct canfd_frame **cfd);struct sk_buff *alloc_canxl_skb(struct net_device *dev, struct canxl_frame **cxl, unsigned int data_len);struct sk_buff *alloc_can_err_skb(struct net_device *dev, struct can_frame **cf);bool can_dropped_invalid_skb(struct net_device *dev, struct sk_buff *skb);
static inline struct can_skb_ext *can_skb_ext_add(struct sk_buff *skb){ struct can_skb_ext *csx = skb_ext_add(skb, SKB_EXT_CAN);
/* skb_ext_add() returns uninitialized space */ if (csx) { csx->can_gw_hops = 0; csx->can_skb_uid = 0; }
return csx;}
static inline struct can_skb_ext *can_skb_ext_find(struct sk_buff *skb){ return skb_ext_find(skb, SKB_EXT_CAN);}
static inline void can_skb_set_owner(struct sk_buff *skb, struct sock *sk){ /* If the socket has already been closed by user space, the * refcount may already be 0 (and the socket will be freed * after the last TX skb has been freed). So only increase * socket refcount if the refcount is > 0. */ if (sk && refcount_inc_not_zero(&sk->sk_refcnt)) { skb->destructor = sock_efree; skb->sk = sk; }}
/* * returns an unshared skb owned by the original sock to be echo'ed back */static inline struct sk_buff *can_create_echo_skb(struct sk_buff *skb){ struct sk_buff *nskb;
nskb = skb_clone(skb, GFP_ATOMIC); if (unlikely(!nskb)) { kfree_skb(skb); return NULL; }
can_skb_set_owner(nskb, skb->sk); consume_skb(skb); return nskb;}
static inline bool can_is_can_skb(const struct sk_buff *skb){ struct can_frame *cf = (struct can_frame *)skb->data;
/* the CAN specific type of skb is identified by its data length */ return (skb->len == CAN_MTU && cf->len <= CAN_MAX_DLEN);}
static inline bool can_is_canfd_skb(const struct sk_buff *skb){ struct canfd_frame *cfd = (struct canfd_frame *)skb->data;
/* the CAN specific type of skb is identified by its data length */ return (skb->len == CANFD_MTU && cfd->len <= CANFD_MAX_DLEN);}
static inline bool can_is_canxl_skb(const struct sk_buff *skb){ const struct canxl_frame *cxl = (struct canxl_frame *)skb->data;
if (skb->len < CANXL_HDR_SIZE + CANXL_MIN_DLEN || skb->len > CANXL_MTU) return false;
/* this also checks valid CAN XL data length boundaries */ if (skb->len != CANXL_HDR_SIZE + cxl->len) return false;
return cxl->flags & CANXL_XLF;}
/* get length element value from can[|fd|xl]_frame structure */static inline unsigned int can_skb_get_len_val(struct sk_buff *skb){ const struct canxl_frame *cxl = (struct canxl_frame *)skb->data; const struct canfd_frame *cfd = (struct canfd_frame *)skb->data;
if (can_is_canxl_skb(skb)) return cxl->len;
return cfd->len;}
/* get needed data length inside CAN frame for all frame types (RTR aware) */static inline unsigned int can_skb_get_data_len(struct sk_buff *skb){ unsigned int len = can_skb_get_len_val(skb); const struct can_frame *cf = (struct can_frame *)skb->data;
/* RTR frames have an actual length of zero */ if (can_is_can_skb(skb) && cf->can_id & CAN_RTR_FLAG) return 0;
return len;}
#endif /* !_CAN_SKB_H */