1 /*
2 * Copyright (c) 2012-2014, 2017 The Linux Foundation. All rights reserved.
3 *
4 * Permission to use, copy, modify, and/or distribute this software for
5 * any purpose with or without fee is hereby granted, provided that the
6 * above copyright notice and this permission notice appear in all
7 * copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
10 * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
11 * WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
12 * AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
13 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
14 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
15 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
16 * PERFORMANCE OF THIS SOFTWARE.
17 */
18
19 #ifndef _IPV6__H_
20 #define _IPV6__H_
21
22 #if defined(ATH_TARGET)
23 #include <osapi.h> /* A_UINT8 */
24 #else
25 #include <a_types.h> /* A_UINT8 */
26 #endif
27
28 /* utilities for converting between network byte order and native endianness */
29 #ifndef BYTESWAP32
30 #define BYTESWAP32(x) \
31 ((((x) & 0x000000ff) << 24) /* byte 0 -> byte 3 */ | \
32 (((x) & 0x0000ff00) << 8) /* byte 1 -> byte 2 */ | \
33 (((x) & 0x00ff0000) >> 8) /* byte 2 -> byte 1 */ | \
34 (((x) & 0xff000000) >> 24) /* byte 3 -> byte 0 */)
35 #endif /* BYTESWAP32 */
36
37 #ifndef BE_TO_CPU32
38 #if defined(ATH_TARGET)
39 /* assume target is little-endian */
40 #define BE_TO_CPU32(x) BYTESWAP32(x)
41 #else
42 #ifdef BIG_ENDIAN_HOST
43 #define BE_TO_CPU32(x) (x)
44 #else
45 #define BE_TO_CPU32(x) BYTESWAP32(x)
46 #endif
47 #endif
48 #endif /* BE_TO_CPU32 */
49
50 /* IPv6 header definition */
51
52 #define IPV6_ADDR_LEN 4 /* bytes */
53 struct ipv6_hdr_t {
54 /* version, traffic class, and flow label */
55 A_UINT32 ver_tclass_flowlabel;
56 A_UINT8 pyld_len[2]; /* payload length */
57 A_UINT8 next_hdr;
58 A_UINT8 hop_limit;
59 A_UINT8 src_addr[IPV6_ADDR_LEN];
60 A_UINT8 dst_addr[IPV6_ADDR_LEN];
61 };
62
63 #define IPV6_HDR_LEN (sizeof(struct ipv6_hdr_t))
64 #define IPV6_HDR_OFFSET_NEXT_HDR (offsetof(struct ipv6_hdr_t, next_hdr))
65 #define IPV6_HDR_OFFSET_DST_ADDR (offsetof(struct ipv6_hdr_t, dst_addr[0]))
66
67 /* IPv6 header field access macros */
68
69 #define IPV6_HDR_VERSION_M 0xF0000000
70 #define IPV6_HDR_VERSION_S 28
71
72 #define IPV6_HDR_TRAFFIC_CLASS_M 0x0FF00000
73 #define IPV6_HDR_TRAFFIC_CLASS_S 20
74
75 #define IPV6_HDR_FLOW_LABEL_M 0x000FFFFF
76 #define IPV6_HDR_FLOW_LABEL_S 0
77
ipv6_version(struct ipv6_hdr_t * ipv6_hdr)78 static inline A_UINT8 ipv6_version(struct ipv6_hdr_t *ipv6_hdr)
79 {
80 return (BE_TO_CPU32(ipv6_hdr->ver_tclass_flowlabel) &
81 IPV6_HDR_VERSION_M) >> IPV6_HDR_VERSION_S;
82 }
83
ipv6_traffic_class(struct ipv6_hdr_t * ipv6_hdr)84 static inline A_UINT8 ipv6_traffic_class(struct ipv6_hdr_t *ipv6_hdr)
85 {
86 return (A_UINT8)((BE_TO_CPU32(ipv6_hdr->ver_tclass_flowlabel) &
87 IPV6_HDR_TRAFFIC_CLASS_M) >> IPV6_HDR_TRAFFIC_CLASS_S);
88 }
89
ipv6_flow_label(struct ipv6_hdr_t * ipv6_hdr)90 static inline A_UINT32 ipv6_flow_label(struct ipv6_hdr_t *ipv6_hdr)
91 {
92 return (BE_TO_CPU32(ipv6_hdr->ver_tclass_flowlabel) &
93 IPV6_HDR_FLOW_LABEL_M) >> IPV6_HDR_FLOW_LABEL_S;
94 }
95
96 #endif /* _IPV6__H_ */
97