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1 | #ifndef __6LOWPAN_NHC_H |
2 | #define __6LOWPAN_NHC_H | |
3 | ||
4 | #include <linux/skbuff.h> | |
5 | #include <linux/rbtree.h> | |
6 | #include <linux/module.h> | |
7 | ||
8 | #include <net/6lowpan.h> | |
9 | #include <net/ipv6.h> | |
10 | ||
11 | #define LOWPAN_NHC_MAX_ID_LEN 1 | |
12 | ||
13 | /** | |
14 | * LOWPAN_NHC - helper macro to generate nh id fields and lowpan_nhc struct | |
15 | * | |
16 | * @__nhc: variable name of the lowpan_nhc struct. | |
17 | * @_name: const char * of common header compression name. | |
18 | * @_nexthdr: ipv6 nexthdr field for the header compression. | |
19 | * @_nexthdrlen: ipv6 nexthdr len for the reserved space. | |
20 | * @_idsetup: callback to setup id and mask values. | |
21 | * @_idlen: len for the next header id and mask, should be always the same. | |
22 | * @_uncompress: callback for uncompression call. | |
23 | * @_compress: callback for compression call. | |
24 | */ | |
25 | #define LOWPAN_NHC(__nhc, _name, _nexthdr, \ | |
26 | _hdrlen, _idsetup, _idlen, \ | |
27 | _uncompress, _compress) \ | |
28 | static u8 __nhc##_val[_idlen]; \ | |
29 | static u8 __nhc##_mask[_idlen]; \ | |
30 | static struct lowpan_nhc __nhc = { \ | |
31 | .name = _name, \ | |
32 | .nexthdr = _nexthdr, \ | |
33 | .nexthdrlen = _hdrlen, \ | |
34 | .id = __nhc##_val, \ | |
35 | .idmask = __nhc##_mask, \ | |
36 | .idlen = _idlen, \ | |
37 | .idsetup = _idsetup, \ | |
38 | .uncompress = _uncompress, \ | |
39 | .compress = _compress, \ | |
40 | } | |
41 | ||
42 | #define module_lowpan_nhc(__nhc) \ | |
43 | static int __init __nhc##_init(void) \ | |
44 | { \ | |
45 | return lowpan_nhc_add(&(__nhc)); \ | |
46 | } \ | |
47 | module_init(__nhc##_init); \ | |
48 | static void __exit __nhc##_exit(void) \ | |
49 | { \ | |
50 | lowpan_nhc_del(&(__nhc)); \ | |
51 | } \ | |
52 | module_exit(__nhc##_exit); | |
53 | ||
54 | /** | |
55 | * struct lowpan_nhc - hold 6lowpan next hdr compression ifnformation | |
56 | * | |
57 | * @node: holder for the rbtree. | |
58 | * @name: name of the specific next header compression | |
59 | * @nexthdr: next header value of the protocol which should be compressed. | |
60 | * @nexthdrlen: ipv6 nexthdr len for the reserved space. | |
61 | * @id: array for nhc id. Note this need to be in network byteorder. | |
62 | * @mask: array for nhc id mask. Note this need to be in network byteorder. | |
63 | * @len: the length of the next header id and mask. | |
64 | * @setup: callback to setup fill the next header id value and mask. | |
65 | * @compress: callback to do the header compression. | |
66 | * @uncompress: callback to do the header uncompression. | |
67 | */ | |
68 | struct lowpan_nhc { | |
69 | struct rb_node node; | |
70 | const char *name; | |
71 | const u8 nexthdr; | |
72 | const size_t nexthdrlen; | |
73 | u8 *id; | |
74 | u8 *idmask; | |
75 | const size_t idlen; | |
76 | ||
77 | void (*idsetup)(struct lowpan_nhc *nhc); | |
78 | int (*uncompress)(struct sk_buff *skb, size_t needed); | |
79 | int (*compress)(struct sk_buff *skb, u8 **hc_ptr); | |
80 | }; | |
81 | ||
82 | /** | |
83 | * lowpan_nhc_by_nexthdr - return the 6lowpan nhc by ipv6 nexthdr. | |
84 | * | |
85 | * @nexthdr: ipv6 nexthdr value. | |
86 | */ | |
87 | struct lowpan_nhc *lowpan_nhc_by_nexthdr(u8 nexthdr); | |
88 | ||
89 | /** | |
90 | * lowpan_nhc_check_compression - checks if we support compression format. If | |
91 | * we support the nhc by nexthdr field, the 6LoWPAN iphc NHC bit will be | |
92 | * set. If we don't support nexthdr will be added as inline data to the | |
93 | * 6LoWPAN header. | |
94 | * | |
95 | * @skb: skb of 6LoWPAN header to read nhc and replace header. | |
96 | * @hdr: ipv6hdr to check the nexthdr value | |
97 | * @hc_ptr: pointer for 6LoWPAN header which should increment at the end of | |
98 | * replaced header. | |
99 | * @iphc0: iphc0 pointer to set the 6LoWPAN NHC bit | |
100 | */ | |
101 | int lowpan_nhc_check_compression(struct sk_buff *skb, | |
102 | const struct ipv6hdr *hdr, u8 **hc_ptr, | |
103 | u8 *iphc0); | |
104 | ||
105 | /** | |
106 | * lowpan_nhc_do_compression - calling compress callback for nhc | |
107 | * | |
108 | * @skb: skb of 6LoWPAN header to read nhc and replace header. | |
109 | * @hdr: ipv6hdr to set the nexthdr value | |
110 | * @hc_ptr: pointer for 6LoWPAN header which should increment at the end of | |
111 | * replaced header. | |
112 | */ | |
113 | int lowpan_nhc_do_compression(struct sk_buff *skb, const struct ipv6hdr *hdr, | |
114 | u8 **hc_ptr); | |
115 | ||
116 | /** | |
117 | * lowpan_nhc_do_uncompression - calling uncompress callback for nhc | |
118 | * | |
119 | * @nhc: 6LoWPAN nhc context, get by lowpan_nhc_by_ functions. | |
120 | * @skb: skb of 6LoWPAN header, skb->data should be pointed to nhc id value. | |
121 | * @dev: netdevice for print logging information. | |
122 | * @hdr: ipv6hdr for setting nexthdr value. | |
123 | */ | |
124 | int lowpan_nhc_do_uncompression(struct sk_buff *skb, struct net_device *dev, | |
125 | struct ipv6hdr *hdr); | |
126 | ||
127 | /** | |
128 | * lowpan_nhc_add - register a next header compression to framework | |
129 | * | |
130 | * @nhc: nhc which should be add. | |
131 | */ | |
132 | int lowpan_nhc_add(struct lowpan_nhc *nhc); | |
133 | ||
134 | /** | |
135 | * lowpan_nhc_del - delete a next header compression from framework | |
136 | * | |
137 | * @nhc: nhc which should be delete. | |
138 | */ | |
139 | void lowpan_nhc_del(struct lowpan_nhc *nhc); | |
140 | ||
141 | /** | |
142 | * lowpan_nhc_init - adding all default nhcs | |
143 | */ | |
144 | void lowpan_nhc_init(void); | |
145 | ||
146 | #endif /* __6LOWPAN_NHC_H */ |