cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

nhc.h (4421B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2#ifndef __6LOWPAN_NHC_H
      3#define __6LOWPAN_NHC_H
      4
      5#include <linux/skbuff.h>
      6#include <linux/rbtree.h>
      7#include <linux/module.h>
      8
      9#include <net/6lowpan.h>
     10#include <net/ipv6.h>
     11
     12/**
     13 * LOWPAN_NHC - helper macro to generate nh id fields and lowpan_nhc struct
     14 *
     15 * @__nhc: variable name of the lowpan_nhc struct.
     16 * @_name: const char * of common header compression name.
     17 * @_nexthdr: ipv6 nexthdr field for the header compression.
     18 * @_nexthdrlen: ipv6 nexthdr len for the reserved space.
     19 * @_idsetup: callback to setup id and mask values.
     20 * @_idlen: len for the next header id and mask, should be always the same.
     21 * @_uncompress: callback for uncompression call.
     22 * @_compress: callback for compression call.
     23 */
     24#define LOWPAN_NHC(__nhc, _name, _nexthdr,	\
     25		   _hdrlen, _idsetup, _idlen,	\
     26		   _uncompress, _compress)	\
     27static u8 __nhc##_val[_idlen];			\
     28static u8 __nhc##_mask[_idlen];			\
     29static struct lowpan_nhc __nhc = {		\
     30	.name		= _name,		\
     31	.nexthdr	= _nexthdr,		\
     32	.nexthdrlen	= _hdrlen,		\
     33	.id		= __nhc##_val,		\
     34	.idmask		= __nhc##_mask,		\
     35	.idlen		= _idlen,		\
     36	.idsetup	= _idsetup,		\
     37	.uncompress	= _uncompress,		\
     38	.compress	= _compress,		\
     39}
     40
     41#define module_lowpan_nhc(__nhc)		\
     42static int __init __nhc##_init(void)		\
     43{						\
     44	return lowpan_nhc_add(&(__nhc));	\
     45}						\
     46module_init(__nhc##_init);			\
     47static void __exit __nhc##_exit(void)		\
     48{						\
     49	lowpan_nhc_del(&(__nhc));		\
     50}						\
     51module_exit(__nhc##_exit);
     52
     53/**
     54 * struct lowpan_nhc - hold 6lowpan next hdr compression ifnformation
     55 *
     56 * @node: holder for the rbtree.
     57 * @name: name of the specific next header compression
     58 * @nexthdr: next header value of the protocol which should be compressed.
     59 * @nexthdrlen: ipv6 nexthdr len for the reserved space.
     60 * @id: array for nhc id. Note this need to be in network byteorder.
     61 * @mask: array for nhc id mask. Note this need to be in network byteorder.
     62 * @len: the length of the next header id and mask.
     63 * @setup: callback to setup fill the next header id value and mask.
     64 * @compress: callback to do the header compression.
     65 * @uncompress: callback to do the header uncompression.
     66 */
     67struct lowpan_nhc {
     68	struct rb_node	node;
     69	const char	*name;
     70	const u8	nexthdr;
     71	const size_t	nexthdrlen;
     72	u8		*id;
     73	u8		*idmask;
     74	const size_t	idlen;
     75
     76	void		(*idsetup)(struct lowpan_nhc *nhc);
     77	int		(*uncompress)(struct sk_buff *skb, size_t needed);
     78	int		(*compress)(struct sk_buff *skb, u8 **hc_ptr);
     79};
     80
     81/**
     82 * lowpan_nhc_by_nexthdr - return the 6lowpan nhc by ipv6 nexthdr.
     83 *
     84 * @nexthdr: ipv6 nexthdr value.
     85 */
     86struct lowpan_nhc *lowpan_nhc_by_nexthdr(u8 nexthdr);
     87
     88/**
     89 * lowpan_nhc_check_compression - checks if we support compression format. If
     90 *	we support the nhc by nexthdr field, the function will return 0. If we
     91 *	don't support the nhc by nexthdr this function will return -ENOENT.
     92 *
     93 * @skb: skb of 6LoWPAN header to read nhc and replace header.
     94 * @hdr: ipv6hdr to check the nexthdr value
     95 * @hc_ptr: pointer for 6LoWPAN header which should increment at the end of
     96 *	    replaced header.
     97 */
     98int lowpan_nhc_check_compression(struct sk_buff *skb,
     99				 const struct ipv6hdr *hdr, u8 **hc_ptr);
    100
    101/**
    102 * lowpan_nhc_do_compression - calling compress callback for nhc
    103 *
    104 * @skb: skb of 6LoWPAN header to read nhc and replace header.
    105 * @hdr: ipv6hdr to set the nexthdr value
    106 * @hc_ptr: pointer for 6LoWPAN header which should increment at the end of
    107 *	    replaced header.
    108 */
    109int lowpan_nhc_do_compression(struct sk_buff *skb, const struct ipv6hdr *hdr,
    110			      u8 **hc_ptr);
    111
    112/**
    113 * lowpan_nhc_do_uncompression - calling uncompress callback for nhc
    114 *
    115 * @nhc: 6LoWPAN nhc context, get by lowpan_nhc_by_ functions.
    116 * @skb: skb of 6LoWPAN header, skb->data should be pointed to nhc id value.
    117 * @dev: netdevice for print logging information.
    118 * @hdr: ipv6hdr for setting nexthdr value.
    119 */
    120int lowpan_nhc_do_uncompression(struct sk_buff *skb,
    121				const struct net_device *dev,
    122				struct ipv6hdr *hdr);
    123
    124/**
    125 * lowpan_nhc_add - register a next header compression to framework
    126 *
    127 * @nhc: nhc which should be add.
    128 */
    129int lowpan_nhc_add(struct lowpan_nhc *nhc);
    130
    131/**
    132 * lowpan_nhc_del - delete a next header compression from framework
    133 *
    134 * @nhc: nhc which should be delete.
    135 */
    136void lowpan_nhc_del(struct lowpan_nhc *nhc);
    137
    138/**
    139 * lowpan_nhc_init - adding all default nhcs
    140 */
    141void lowpan_nhc_init(void);
    142
    143#endif /* __6LOWPAN_NHC_H */