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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
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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 | ||
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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. | |
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19 | * @_id: one byte nhc id value. |
20 | * @_idmask: one byte nhc id mask value. | |
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21 | * @_uncompress: callback for uncompression call. |
22 | * @_compress: callback for compression call. | |
23 | */ | |
24 | #define LOWPAN_NHC(__nhc, _name, _nexthdr, \ | |
31264f95 | 25 | _hdrlen, _id, _idmask, \ |
92aa7c65 | 26 | _uncompress, _compress) \ |
f3de6f4e | 27 | static const struct lowpan_nhc __nhc = { \ |
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28 | .name = _name, \ |
29 | .nexthdr = _nexthdr, \ | |
30 | .nexthdrlen = _hdrlen, \ | |
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31 | .id = _id, \ |
32 | .idmask = _idmask, \ | |
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33 | .uncompress = _uncompress, \ |
34 | .compress = _compress, \ | |
35 | } | |
36 | ||
37 | #define module_lowpan_nhc(__nhc) \ | |
38 | static int __init __nhc##_init(void) \ | |
39 | { \ | |
40 | return lowpan_nhc_add(&(__nhc)); \ | |
41 | } \ | |
42 | module_init(__nhc##_init); \ | |
43 | static void __exit __nhc##_exit(void) \ | |
44 | { \ | |
45 | lowpan_nhc_del(&(__nhc)); \ | |
46 | } \ | |
47 | module_exit(__nhc##_exit); | |
48 | ||
49 | /** | |
50 | * struct lowpan_nhc - hold 6lowpan next hdr compression ifnformation | |
51 | * | |
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52 | * @name: name of the specific next header compression |
53 | * @nexthdr: next header value of the protocol which should be compressed. | |
54 | * @nexthdrlen: ipv6 nexthdr len for the reserved space. | |
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55 | * @id: one byte nhc id value. |
56 | * @idmask: one byte nhc id mask value. | |
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57 | * @compress: callback to do the header compression. |
58 | * @uncompress: callback to do the header uncompression. | |
59 | */ | |
60 | struct lowpan_nhc { | |
92aa7c65 | 61 | const char *name; |
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62 | u8 nexthdr; |
63 | size_t nexthdrlen; | |
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64 | u8 id; |
65 | u8 idmask; | |
92aa7c65 | 66 | |
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67 | int (*uncompress)(struct sk_buff *skb, size_t needed); |
68 | int (*compress)(struct sk_buff *skb, u8 **hc_ptr); | |
69 | }; | |
70 | ||
71 | /** | |
72 | * lowpan_nhc_by_nexthdr - return the 6lowpan nhc by ipv6 nexthdr. | |
73 | * | |
74 | * @nexthdr: ipv6 nexthdr value. | |
75 | */ | |
76 | struct lowpan_nhc *lowpan_nhc_by_nexthdr(u8 nexthdr); | |
77 | ||
78 | /** | |
79 | * lowpan_nhc_check_compression - checks if we support compression format. If | |
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80 | * we support the nhc by nexthdr field, the function will return 0. If we |
81 | * don't support the nhc by nexthdr this function will return -ENOENT. | |
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82 | * |
83 | * @skb: skb of 6LoWPAN header to read nhc and replace header. | |
84 | * @hdr: ipv6hdr to check the nexthdr value | |
85 | * @hc_ptr: pointer for 6LoWPAN header which should increment at the end of | |
86 | * replaced header. | |
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87 | */ |
88 | int lowpan_nhc_check_compression(struct sk_buff *skb, | |
607b0bd3 | 89 | const struct ipv6hdr *hdr, u8 **hc_ptr); |
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90 | |
91 | /** | |
92 | * lowpan_nhc_do_compression - calling compress callback for nhc | |
93 | * | |
94 | * @skb: skb of 6LoWPAN header to read nhc and replace header. | |
95 | * @hdr: ipv6hdr to set the nexthdr value | |
96 | * @hc_ptr: pointer for 6LoWPAN header which should increment at the end of | |
97 | * replaced header. | |
98 | */ | |
99 | int lowpan_nhc_do_compression(struct sk_buff *skb, const struct ipv6hdr *hdr, | |
100 | u8 **hc_ptr); | |
101 | ||
102 | /** | |
103 | * lowpan_nhc_do_uncompression - calling uncompress callback for nhc | |
104 | * | |
105 | * @nhc: 6LoWPAN nhc context, get by lowpan_nhc_by_ functions. | |
106 | * @skb: skb of 6LoWPAN header, skb->data should be pointed to nhc id value. | |
107 | * @dev: netdevice for print logging information. | |
108 | * @hdr: ipv6hdr for setting nexthdr value. | |
109 | */ | |
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110 | int lowpan_nhc_do_uncompression(struct sk_buff *skb, |
111 | const struct net_device *dev, | |
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112 | struct ipv6hdr *hdr); |
113 | ||
114 | /** | |
115 | * lowpan_nhc_add - register a next header compression to framework | |
116 | * | |
117 | * @nhc: nhc which should be add. | |
118 | */ | |
f3de6f4e | 119 | int lowpan_nhc_add(const struct lowpan_nhc *nhc); |
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120 | |
121 | /** | |
122 | * lowpan_nhc_del - delete a next header compression from framework | |
123 | * | |
124 | * @nhc: nhc which should be delete. | |
125 | */ | |
f3de6f4e | 126 | void lowpan_nhc_del(const struct lowpan_nhc *nhc); |
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127 | |
128 | /** | |
129 | * lowpan_nhc_init - adding all default nhcs | |
130 | */ | |
131 | void lowpan_nhc_init(void); | |
132 | ||
133 | #endif /* __6LOWPAN_NHC_H */ |