2 * Copyright 2007, Broadcom Corporation
5 * THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY
6 * KIND, EXPRESS OR IMPLIED, BY STATUTE, COMMUNICATION OR OTHERWISE. BROADCOM
7 * SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
8 * FOR A SPECIFIC PURPOSE OR NONINFRINGEMENT CONCERNING THIS SOFTWARE.
10 * Fundamental constants relating to IP Protocol
17 /* enable structure packing */
19 #define PACKED __attribute__((packed))
26 /* IPV4 and IPV6 common */
27 #define IP_VER_OFFSET 0x0 /* offset to version field */
28 #define IP_VER_MASK 0xf0 /* version mask */
29 #define IP_VER_SHIFT 4 /* version shift */
30 #define IP_VER_4 4 /* version number for IPV4 */
31 #define IP_VER_6 6 /* version number for IPV6 */
33 #define IP_VER(ip_body) \
34 ((((uint8 *)(ip_body))[IP_VER_OFFSET] & IP_VER_MASK) >> IP_VER_SHIFT)
36 #define IP_PROT_ICMP 0x1 /* ICMP protocol */
37 #define IP_PROT_TCP 0x6 /* TCP protocol */
38 #define IP_PROT_UDP 0x11 /* UDP protocol type */
40 /* IPV4 field offsets */
41 #define IPV4_VER_HL_OFFSET 0 /* version and ihl byte offset */
42 #define IPV4_TOS_OFFSET 1 /* type of service offset */
43 #define IPV4_PKTLEN_OFFSET 2 /* packet length offset */
44 #define IPV4_PKTFLAG_OFFSET 6 /* more-frag,dont-frag flag offset */
45 #define IPV4_PROT_OFFSET 9 /* protocol type offset */
46 #define IPV4_CHKSUM_OFFSET 10 /* IP header checksum offset */
47 #define IPV4_SRC_IP_OFFSET 12 /* src IP addr offset */
48 #define IPV4_DEST_IP_OFFSET 16 /* dest IP addr offset */
49 #define IPV4_OPTIONS_OFFSET 20 /* IP options offset */
51 /* IPV4 field decodes */
52 #define IPV4_VER_MASK 0xf0 /* IPV4 version mask */
53 #define IPV4_VER_SHIFT 4 /* IPV4 version shift */
55 #define IPV4_HLEN_MASK 0x0f /* IPV4 header length mask */
56 #define IPV4_HLEN(ipv4_body) (4 * (((uint8 *)(ipv4_body))[IPV4_VER_HL_OFFSET] & IPV4_HLEN_MASK))
58 #define IPV4_ADDR_LEN 4 /* IPV4 address length */
60 #define IPV4_ADDR_NULL(a) ((((uint8 *)(a))[0] | ((uint8 *)(a))[1] | \
61 ((uint8 *)(a))[2] | ((uint8 *)(a))[3]) == 0)
63 #define IPV4_ADDR_BCAST(a) ((((uint8 *)(a))[0] & ((uint8 *)(a))[1] & \
64 ((uint8 *)(a))[2] & ((uint8 *)(a))[3]) == 0xff)
66 #define IPV4_TOS_DSCP_MASK 0xfc /* DiffServ codepoint mask */
67 #define IPV4_TOS_DSCP_SHIFT 2 /* DiffServ codepoint shift */
69 #define IPV4_TOS(ipv4_body) (((uint8 *)(ipv4_body))[IPV4_TOS_OFFSET])
71 #define IPV4_TOS_PREC_MASK 0xe0 /* Historical precedence mask */
72 #define IPV4_TOS_PREC_SHIFT 5 /* Historical precedence shift */
74 #define IPV4_TOS_LOWDELAY 0x10 /* Lowest delay requested */
75 #define IPV4_TOS_THROUGHPUT 0x8 /* Best throughput requested */
76 #define IPV4_TOS_RELIABILITY 0x4 /* Most reliable delivery requested */
78 #define IPV4_PROT(ipv4_body) (((uint8 *)(ipv4_body))[IPV4_PROT_OFFSET])
80 #define IPV4_FRAG_RESV 0x8000 /* Reserved */
81 #define IPV4_FRAG_DONT 0x4000 /* Don't fragment */
82 #define IPV4_FRAG_MORE 0x2000 /* More fragments */
83 #define IPV4_FRAG_OFFSET_MASK 0x1fff /* Fragment offset */
85 #define IPV4_ADDR_STR_LEN 16 /* Max IP address length in string format */
87 /* IPv4, no options only. */
88 #define IPV4_NO_OPTIONS_HDR_LEN 20
89 #define IPV4_NO_OPTIONS_PAYLOAD(ip_hdr) (&(((uint8 *)(ip_hdr))[IPV4_NO_OPTIONS_HDR_LEN]))
91 #define IPV4_PAYLOAD_LEN(ip_body) \
92 (((int)(((uint8 *)(ip_body))[IPV4_PKTLEN_OFFSET + 0]) << 8) | \
93 ((uint8 *)(ip_body))[IPV4_PKTLEN_OFFSET + 1])
95 /* IPV4 packet formats */
97 uint8 addr
[IPV4_ADDR_LEN
];
101 uint8 version_ihl
; /* Version and Internet Header Length */
102 uint8 tos
; /* Type Of Service */
103 uint16 tot_len
; /* Number of bytes in packet (max 65535) */
105 uint16 frag
; /* 3 flag bits and fragment offset */
106 uint8 ttl
; /* Time To Live */
107 uint8 prot
; /* Protocol */
108 uint16 hdr_chksum
; /* IP header checksum */
109 uint8 src_ip
[IPV4_ADDR_LEN
]; /* Source IP Address */
110 uint8 dst_ip
[IPV4_ADDR_LEN
]; /* Destination IP Address */
113 /* IPV6 field offsets */
114 #define IPV6_PAYLOAD_LEN_OFFSET 4 /* payload length offset */
115 #define IPV6_NEXT_HDR_OFFSET 6 /* next header/protocol offset */
116 #define IPV6_HOP_LIMIT_OFFSET 7 /* hop limit offset */
117 #define IPV6_SRC_IP_OFFSET 8 /* src IP addr offset */
118 #define IPV6_DEST_IP_OFFSET 24 /* dst IP addr offset */
120 /* IPV6 field decodes */
121 #define IPV6_TRAFFIC_CLASS(ipv6_body) \
122 (((((uint8 *)(ipv6_body))[0] & 0x0f) << 4) | \
123 ((((uint8 *)(ipv6_body))[1] & 0xf0) >> 4))
125 #define IPV6_FLOW_LABEL(ipv6_body) \
126 (((((uint8 *)(ipv6_body))[1] & 0x0f) << 16) | \
127 (((uint8 *)(ipv6_body))[2] << 8) | \
128 (((uint8 *)(ipv6_body))[3]))
130 #define IPV6_PAYLOAD_LEN(ipv6_body) \
131 ((((uint8 *)(ipv6_body))[IPV6_PAYLOAD_LEN_OFFSET + 0] << 8) | \
132 ((uint8 *)(ipv6_body))[IPV6_PAYLOAD_LEN_OFFSET + 1])
134 #define IPV6_NEXT_HDR(ipv6_body) \
135 (((uint8 *)(ipv6_body))[IPV6_NEXT_HDR_OFFSET])
137 #define IPV6_PROT(ipv6_body) IPV6_NEXT_HDR(ipv6_body)
139 #define IPV6_ADDR_LEN 16 /* IPV6 address length */
141 /* IPV4 TOS or IPV6 Traffic Classifier or 0 */
142 #define IP_TOS(ip_body) \
143 (IP_VER(ip_body) == IP_VER_4 ? IPV4_TOS(ip_body) : \
144 IP_VER(ip_body) == IP_VER_6 ? IPV6_TRAFFIC_CLASS(ip_body) : 0)
147 #if !defined(__GNUC__)
151 #endif /* _bcmip_h_ */