233 lines
6.3 KiB
C
233 lines
6.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) ST-Ericsson AB 2010
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* Author: Sjur Brendeland
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*/
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#ifndef CFPKT_H_
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#define CFPKT_H_
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#include <net/caif/caif_layer.h>
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#include <linux/types.h>
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struct cfpkt;
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/* Create a CAIF packet.
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* len: Length of packet to be created
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* @return New packet.
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*/
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struct cfpkt *cfpkt_create(u16 len);
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/*
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* Destroy a CAIF Packet.
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* pkt Packet to be destoyed.
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*/
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void cfpkt_destroy(struct cfpkt *pkt);
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/*
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* Extract header from packet.
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*
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* pkt Packet to extract header data from.
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* data Pointer to copy the header data into.
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* len Length of head data to copy.
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* @return zero on success and error code upon failure
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*/
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int cfpkt_extr_head(struct cfpkt *pkt, void *data, u16 len);
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static inline u8 cfpkt_extr_head_u8(struct cfpkt *pkt)
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{
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u8 tmp;
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cfpkt_extr_head(pkt, &tmp, 1);
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return tmp;
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}
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static inline u16 cfpkt_extr_head_u16(struct cfpkt *pkt)
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{
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__le16 tmp;
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cfpkt_extr_head(pkt, &tmp, 2);
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return le16_to_cpu(tmp);
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}
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static inline u32 cfpkt_extr_head_u32(struct cfpkt *pkt)
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{
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__le32 tmp;
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cfpkt_extr_head(pkt, &tmp, 4);
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return le32_to_cpu(tmp);
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}
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/*
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* Peek header from packet.
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* Reads data from packet without changing packet.
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*
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* pkt Packet to extract header data from.
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* data Pointer to copy the header data into.
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* len Length of head data to copy.
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* @return zero on success and error code upon failure
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*/
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int cfpkt_peek_head(struct cfpkt *pkt, void *data, u16 len);
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/*
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* Extract header from trailer (end of packet).
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*
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* pkt Packet to extract header data from.
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* data Pointer to copy the trailer data into.
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* len Length of header data to copy.
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* @return zero on success and error code upon failure
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*/
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int cfpkt_extr_trail(struct cfpkt *pkt, void *data, u16 len);
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/*
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* Add header to packet.
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*
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*
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* pkt Packet to add header data to.
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* data Pointer to data to copy into the header.
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* len Length of header data to copy.
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* @return zero on success and error code upon failure
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*/
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int cfpkt_add_head(struct cfpkt *pkt, const void *data, u16 len);
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/*
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* Add trailer to packet.
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*
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*
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* pkt Packet to add trailer data to.
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* data Pointer to data to copy into the trailer.
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* len Length of trailer data to copy.
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* @return zero on success and error code upon failure
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*/
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int cfpkt_add_trail(struct cfpkt *pkt, const void *data, u16 len);
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/*
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* Pad trailer on packet.
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* Moves data pointer in packet, no content copied.
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*
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* pkt Packet in which to pad trailer.
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* len Length of padding to add.
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* @return zero on success and error code upon failure
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*/
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int cfpkt_pad_trail(struct cfpkt *pkt, u16 len);
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/*
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* Add a single byte to packet body (tail).
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*
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* pkt Packet in which to add byte.
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* data Byte to add.
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* @return zero on success and error code upon failure
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*/
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int cfpkt_addbdy(struct cfpkt *pkt, const u8 data);
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/*
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* Add a data to packet body (tail).
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*
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* pkt Packet in which to add data.
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* data Pointer to data to copy into the packet body.
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* len Length of data to add.
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* @return zero on success and error code upon failure
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*/
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int cfpkt_add_body(struct cfpkt *pkt, const void *data, u16 len);
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/*
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* Checks whether there are more data to process in packet.
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* pkt Packet to check.
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* @return true if more data are available in packet false otherwise
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*/
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bool cfpkt_more(struct cfpkt *pkt);
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/*
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* Checks whether the packet is erroneous,
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* i.e. if it has been attempted to extract more data than available in packet
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* or writing more data than has been allocated in cfpkt_create().
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* pkt Packet to check.
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* @return true on error false otherwise
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*/
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bool cfpkt_erroneous(struct cfpkt *pkt);
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/*
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* Get the packet length.
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* pkt Packet to get length from.
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* @return Number of bytes in packet.
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*/
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u16 cfpkt_getlen(struct cfpkt *pkt);
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/*
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* Set the packet length, by adjusting the trailer pointer according to length.
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* pkt Packet to set length.
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* len Packet length.
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* @return Number of bytes in packet.
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*/
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int cfpkt_setlen(struct cfpkt *pkt, u16 len);
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/*
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* cfpkt_append - Appends a packet's data to another packet.
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* dstpkt: Packet to append data into, WILL BE FREED BY THIS FUNCTION
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* addpkt: Packet to be appended and automatically released,
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* WILL BE FREED BY THIS FUNCTION.
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* expectlen: Packet's expected total length. This should be considered
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* as a hint.
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* NB: Input packets will be destroyed after appending and cannot be used
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* after calling this function.
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* @return The new appended packet.
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*/
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struct cfpkt *cfpkt_append(struct cfpkt *dstpkt, struct cfpkt *addpkt,
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u16 expectlen);
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/*
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* cfpkt_split - Split a packet into two packets at the specified split point.
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* pkt: Packet to be split (will contain the first part of the data on exit)
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* pos: Position to split packet in two parts.
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* @return The new packet, containing the second part of the data.
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*/
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struct cfpkt *cfpkt_split(struct cfpkt *pkt, u16 pos);
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/*
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* Iteration function, iterates the packet buffers from start to end.
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*
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* Checksum iteration function used to iterate buffers
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* (we may have packets consisting of a chain of buffers)
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* pkt: Packet to calculate checksum for
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* iter_func: Function pointer to iteration function
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* chks: Checksum calculated so far.
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* buf: Pointer to the buffer to checksum
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* len: Length of buf.
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* data: Initial checksum value.
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* @return Checksum of buffer.
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*/
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int cfpkt_iterate(struct cfpkt *pkt,
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u16 (*iter_func)(u16 chks, void *buf, u16 len),
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u16 data);
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/* Map from a "native" packet (e.g. Linux Socket Buffer) to a CAIF packet.
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* dir - Direction indicating whether this packet is to be sent or received.
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* nativepkt - The native packet to be transformed to a CAIF packet
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* @return The mapped CAIF Packet CFPKT.
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*/
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struct cfpkt *cfpkt_fromnative(enum caif_direction dir, void *nativepkt);
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/* Map from a CAIF packet to a "native" packet (e.g. Linux Socket Buffer).
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* pkt - The CAIF packet to be transformed into a "native" packet.
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* @return The native packet transformed from a CAIF packet.
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*/
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void *cfpkt_tonative(struct cfpkt *pkt);
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/*
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* Returns packet information for a packet.
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* pkt Packet to get info from;
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* @return Packet information
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*/
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struct caif_payload_info *cfpkt_info(struct cfpkt *pkt);
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/** cfpkt_set_prio - set priority for a CAIF packet.
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*
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* @pkt: The CAIF packet to be adjusted.
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* @prio: one of TC_PRIO_ constants.
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*/
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void cfpkt_set_prio(struct cfpkt *pkt, int prio);
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#endif /* CFPKT_H_ */
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