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