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143 lines
4.3 KiB
143 lines
4.3 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef __6LOWPAN_NHC_H |
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#define __6LOWPAN_NHC_H |
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#include <linux/skbuff.h> |
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#include <linux/rbtree.h> |
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#include <linux/module.h> |
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#include <net/6lowpan.h> |
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#include <net/ipv6.h> |
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/** |
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* LOWPAN_NHC - helper macro to generate nh id fields and lowpan_nhc struct |
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* |
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* @__nhc: variable name of the lowpan_nhc struct. |
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* @_name: const char * of common header compression name. |
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* @_nexthdr: ipv6 nexthdr field for the header compression. |
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* @_nexthdrlen: ipv6 nexthdr len for the reserved space. |
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* @_idsetup: callback to setup id and mask values. |
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* @_idlen: len for the next header id and mask, should be always the same. |
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* @_uncompress: callback for uncompression call. |
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* @_compress: callback for compression call. |
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*/ |
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#define LOWPAN_NHC(__nhc, _name, _nexthdr, \ |
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_hdrlen, _idsetup, _idlen, \ |
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_uncompress, _compress) \ |
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static u8 __nhc##_val[_idlen]; \ |
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static u8 __nhc##_mask[_idlen]; \ |
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static struct lowpan_nhc __nhc = { \ |
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.name = _name, \ |
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.nexthdr = _nexthdr, \ |
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.nexthdrlen = _hdrlen, \ |
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.id = __nhc##_val, \ |
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.idmask = __nhc##_mask, \ |
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.idlen = _idlen, \ |
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.idsetup = _idsetup, \ |
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.uncompress = _uncompress, \ |
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.compress = _compress, \ |
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} |
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#define module_lowpan_nhc(__nhc) \ |
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static int __init __nhc##_init(void) \ |
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{ \ |
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return lowpan_nhc_add(&(__nhc)); \ |
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} \ |
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module_init(__nhc##_init); \ |
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static void __exit __nhc##_exit(void) \ |
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{ \ |
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lowpan_nhc_del(&(__nhc)); \ |
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} \ |
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module_exit(__nhc##_exit); |
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/** |
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* struct lowpan_nhc - hold 6lowpan next hdr compression ifnformation |
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* |
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* @node: holder for the rbtree. |
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* @name: name of the specific next header compression |
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* @nexthdr: next header value of the protocol which should be compressed. |
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* @nexthdrlen: ipv6 nexthdr len for the reserved space. |
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* @id: array for nhc id. Note this need to be in network byteorder. |
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* @mask: array for nhc id mask. Note this need to be in network byteorder. |
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* @len: the length of the next header id and mask. |
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* @setup: callback to setup fill the next header id value and mask. |
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* @compress: callback to do the header compression. |
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* @uncompress: callback to do the header uncompression. |
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*/ |
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struct lowpan_nhc { |
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struct rb_node node; |
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const char *name; |
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const u8 nexthdr; |
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const size_t nexthdrlen; |
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u8 *id; |
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u8 *idmask; |
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const size_t idlen; |
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void (*idsetup)(struct lowpan_nhc *nhc); |
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int (*uncompress)(struct sk_buff *skb, size_t needed); |
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int (*compress)(struct sk_buff *skb, u8 **hc_ptr); |
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}; |
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/** |
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* lowpan_nhc_by_nexthdr - return the 6lowpan nhc by ipv6 nexthdr. |
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* |
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* @nexthdr: ipv6 nexthdr value. |
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*/ |
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struct lowpan_nhc *lowpan_nhc_by_nexthdr(u8 nexthdr); |
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/** |
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* lowpan_nhc_check_compression - checks if we support compression format. If |
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* we support the nhc by nexthdr field, the function will return 0. If we |
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* don't support the nhc by nexthdr this function will return -ENOENT. |
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* |
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* @skb: skb of 6LoWPAN header to read nhc and replace header. |
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* @hdr: ipv6hdr to check the nexthdr value |
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* @hc_ptr: pointer for 6LoWPAN header which should increment at the end of |
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* replaced header. |
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*/ |
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int lowpan_nhc_check_compression(struct sk_buff *skb, |
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const struct ipv6hdr *hdr, u8 **hc_ptr); |
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/** |
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* lowpan_nhc_do_compression - calling compress callback for nhc |
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* |
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* @skb: skb of 6LoWPAN header to read nhc and replace header. |
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* @hdr: ipv6hdr to set the nexthdr value |
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* @hc_ptr: pointer for 6LoWPAN header which should increment at the end of |
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* replaced header. |
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*/ |
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int lowpan_nhc_do_compression(struct sk_buff *skb, const struct ipv6hdr *hdr, |
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u8 **hc_ptr); |
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/** |
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* lowpan_nhc_do_uncompression - calling uncompress callback for nhc |
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* |
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* @nhc: 6LoWPAN nhc context, get by lowpan_nhc_by_ functions. |
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* @skb: skb of 6LoWPAN header, skb->data should be pointed to nhc id value. |
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* @dev: netdevice for print logging information. |
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* @hdr: ipv6hdr for setting nexthdr value. |
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*/ |
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int lowpan_nhc_do_uncompression(struct sk_buff *skb, |
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const struct net_device *dev, |
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struct ipv6hdr *hdr); |
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/** |
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* lowpan_nhc_add - register a next header compression to framework |
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* |
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* @nhc: nhc which should be add. |
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*/ |
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int lowpan_nhc_add(struct lowpan_nhc *nhc); |
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/** |
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* lowpan_nhc_del - delete a next header compression from framework |
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* |
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* @nhc: nhc which should be delete. |
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*/ |
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void lowpan_nhc_del(struct lowpan_nhc *nhc); |
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/** |
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* lowpan_nhc_init - adding all default nhcs |
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*/ |
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void lowpan_nhc_init(void); |
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#endif /* __6LOWPAN_NHC_H */
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