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9f10374bb0
This patch removes struct can_skb_priv which was stored at skb->head and the can_skb_reserve() helper which was used to shift skb->head. Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de> Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net> Link: https://patch.msgid.link/20260201-can_skb_ext-v8-5-3635d790fe8b@hartkopp.net Signed-off-by: Paolo Abeni <pabeni@redhat.com>
144 lines
4.0 KiB
C
144 lines
4.0 KiB
C
/* SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause) */
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/*
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* linux/can/skb.h
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*
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* Definitions for the CAN network socket buffer
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*
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* Copyright (C) 2012 Oliver Hartkopp <socketcan@hartkopp.net>
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*
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*/
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#ifndef _CAN_SKB_H
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#define _CAN_SKB_H
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#include <linux/types.h>
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#include <linux/skbuff.h>
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#include <linux/can.h>
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#include <net/can.h>
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#include <net/sock.h>
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void can_flush_echo_skb(struct net_device *dev);
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int can_put_echo_skb(struct sk_buff *skb, struct net_device *dev,
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unsigned int idx, unsigned int frame_len);
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struct sk_buff *__can_get_echo_skb(struct net_device *dev, unsigned int idx,
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unsigned int *len_ptr,
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unsigned int *frame_len_ptr);
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unsigned int __must_check can_get_echo_skb(struct net_device *dev,
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unsigned int idx,
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unsigned int *frame_len_ptr);
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void can_free_echo_skb(struct net_device *dev, unsigned int idx,
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unsigned int *frame_len_ptr);
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struct sk_buff *alloc_can_skb(struct net_device *dev, struct can_frame **cf);
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struct sk_buff *alloc_canfd_skb(struct net_device *dev,
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struct canfd_frame **cfd);
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struct sk_buff *alloc_canxl_skb(struct net_device *dev,
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struct canxl_frame **cxl,
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unsigned int data_len);
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struct sk_buff *alloc_can_err_skb(struct net_device *dev,
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struct can_frame **cf);
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bool can_dropped_invalid_skb(struct net_device *dev, struct sk_buff *skb);
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static inline struct can_skb_ext *can_skb_ext_add(struct sk_buff *skb)
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{
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struct can_skb_ext *csx = skb_ext_add(skb, SKB_EXT_CAN);
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/* skb_ext_add() returns uninitialized space */
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if (csx)
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csx->can_gw_hops = 0;
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return csx;
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}
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static inline struct can_skb_ext *can_skb_ext_find(struct sk_buff *skb)
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{
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return skb_ext_find(skb, SKB_EXT_CAN);
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}
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static inline void can_skb_set_owner(struct sk_buff *skb, struct sock *sk)
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{
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/* If the socket has already been closed by user space, the
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* refcount may already be 0 (and the socket will be freed
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* after the last TX skb has been freed). So only increase
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* socket refcount if the refcount is > 0.
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*/
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if (sk && refcount_inc_not_zero(&sk->sk_refcnt)) {
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skb->destructor = sock_efree;
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skb->sk = sk;
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}
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}
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/*
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* returns an unshared skb owned by the original sock to be echo'ed back
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*/
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static inline struct sk_buff *can_create_echo_skb(struct sk_buff *skb)
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{
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struct sk_buff *nskb;
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nskb = skb_clone(skb, GFP_ATOMIC);
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if (unlikely(!nskb)) {
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kfree_skb(skb);
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return NULL;
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}
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can_skb_set_owner(nskb, skb->sk);
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consume_skb(skb);
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return nskb;
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}
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static inline bool can_is_can_skb(const struct sk_buff *skb)
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{
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struct can_frame *cf = (struct can_frame *)skb->data;
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/* the CAN specific type of skb is identified by its data length */
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return (skb->len == CAN_MTU && cf->len <= CAN_MAX_DLEN);
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}
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static inline bool can_is_canfd_skb(const struct sk_buff *skb)
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{
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struct canfd_frame *cfd = (struct canfd_frame *)skb->data;
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/* the CAN specific type of skb is identified by its data length */
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return (skb->len == CANFD_MTU && cfd->len <= CANFD_MAX_DLEN);
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}
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static inline bool can_is_canxl_skb(const struct sk_buff *skb)
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{
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const struct canxl_frame *cxl = (struct canxl_frame *)skb->data;
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if (skb->len < CANXL_HDR_SIZE + CANXL_MIN_DLEN || skb->len > CANXL_MTU)
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return false;
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/* this also checks valid CAN XL data length boundaries */
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if (skb->len != CANXL_HDR_SIZE + cxl->len)
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return false;
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return cxl->flags & CANXL_XLF;
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}
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/* get length element value from can[|fd|xl]_frame structure */
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static inline unsigned int can_skb_get_len_val(struct sk_buff *skb)
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{
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const struct canxl_frame *cxl = (struct canxl_frame *)skb->data;
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const struct canfd_frame *cfd = (struct canfd_frame *)skb->data;
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if (can_is_canxl_skb(skb))
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return cxl->len;
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return cfd->len;
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}
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/* get needed data length inside CAN frame for all frame types (RTR aware) */
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static inline unsigned int can_skb_get_data_len(struct sk_buff *skb)
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{
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unsigned int len = can_skb_get_len_val(skb);
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const struct can_frame *cf = (struct can_frame *)skb->data;
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/* RTR frames have an actual length of zero */
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if (can_is_can_skb(skb) && cf->can_id & CAN_RTR_FLAG)
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return 0;
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return len;
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}
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#endif /* !_CAN_SKB_H */
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