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/*
* Copyright 2007, Broadcom Corporation
* All Rights Reserved.
*
* THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY
* KIND, EXPRESS OR IMPLIED, BY STATUTE, COMMUNICATION OR OTHERWISE. BROADCOM
* SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
* FOR A SPECIFIC PURPOSE OR NONINFRINGEMENT CONCERNING THIS SOFTWARE.
*
* Fundamental constants relating to IP Protocol
*
* $Id$
*/
#ifndef _bcmip_h_
#define _bcmip_h_
/* enable structure packing */
#if defined(__GNUC__)
#define PACKED __attribute__((packed))
#else
#pragma pack(1)
#define PACKED
#endif
/* IPV4 and IPV6 common */
#define IP_VER_OFFSET 0x0 /* offset to version field */
#define IP_VER_MASK 0xf0 /* version mask */
#define IP_VER_SHIFT 4 /* version shift */
#define IP_VER_4 4 /* version number for IPV4 */
#define IP_VER_6 6 /* version number for IPV6 */
#define IP_VER(ip_body) \
((((uint8 *)(ip_body))[IP_VER_OFFSET] & IP_VER_MASK) >> IP_VER_SHIFT)
#define IP_PROT_ICMP 0x1 /* ICMP protocol */
#define IP_PROT_TCP 0x6 /* TCP protocol */
#define IP_PROT_UDP 0x11 /* UDP protocol type */
/* IPV4 field offsets */
#define IPV4_VER_HL_OFFSET 0 /* version and ihl byte offset */
#define IPV4_TOS_OFFSET 1 /* type of service offset */
#define IPV4_PKTLEN_OFFSET 2 /* packet length offset */
#define IPV4_PKTFLAG_OFFSET 6 /* more-frag,dont-frag flag offset */
#define IPV4_PROT_OFFSET 9 /* protocol type offset */
#define IPV4_CHKSUM_OFFSET 10 /* IP header checksum offset */
#define IPV4_SRC_IP_OFFSET 12 /* src IP addr offset */
#define IPV4_DEST_IP_OFFSET 16 /* dest IP addr offset */
#define IPV4_OPTIONS_OFFSET 20 /* IP options offset */
/* IPV4 field decodes */
#define IPV4_VER_MASK 0xf0 /* IPV4 version mask */
#define IPV4_VER_SHIFT 4 /* IPV4 version shift */
#define IPV4_HLEN_MASK 0x0f /* IPV4 header length mask */
#define IPV4_HLEN(ipv4_body) (4 * (((uint8 *)(ipv4_body))[IPV4_VER_HL_OFFSET] & IPV4_HLEN_MASK))
#define IPV4_ADDR_LEN 4 /* IPV4 address length */
#define IPV4_ADDR_NULL(a) ((((uint8 *)(a))[0] | ((uint8 *)(a))[1] | \
((uint8 *)(a))[2] | ((uint8 *)(a))[3]) == 0)
#define IPV4_ADDR_BCAST(a) ((((uint8 *)(a))[0] & ((uint8 *)(a))[1] & \
((uint8 *)(a))[2] & ((uint8 *)(a))[3]) == 0xff)
#define IPV4_TOS_DSCP_MASK 0xfc /* DiffServ codepoint mask */
#define IPV4_TOS_DSCP_SHIFT 2 /* DiffServ codepoint shift */
#define IPV4_TOS(ipv4_body) (((uint8 *)(ipv4_body))[IPV4_TOS_OFFSET])
#define IPV4_TOS_PREC_MASK 0xe0 /* Historical precedence mask */
#define IPV4_TOS_PREC_SHIFT 5 /* Historical precedence shift */
#define IPV4_TOS_LOWDELAY 0x10 /* Lowest delay requested */
#define IPV4_TOS_THROUGHPUT 0x8 /* Best throughput requested */
#define IPV4_TOS_RELIABILITY 0x4 /* Most reliable delivery requested */
#define IPV4_PROT(ipv4_body) (((uint8 *)(ipv4_body))[IPV4_PROT_OFFSET])
#define IPV4_FRAG_RESV 0x8000 /* Reserved */
#define IPV4_FRAG_DONT 0x4000 /* Don't fragment */
#define IPV4_FRAG_MORE 0x2000 /* More fragments */
#define IPV4_FRAG_OFFSET_MASK 0x1fff /* Fragment offset */
#define IPV4_ADDR_STR_LEN 16 /* Max IP address length in string format */
/* IPv4, no options only. */
#define IPV4_NO_OPTIONS_HDR_LEN 20
#define IPV4_NO_OPTIONS_PAYLOAD(ip_hdr) (&(((uint8 *)(ip_hdr))[IPV4_NO_OPTIONS_HDR_LEN]))
#define IPV4_PAYLOAD_LEN(ip_body) \
(((int)(((uint8 *)(ip_body))[IPV4_PKTLEN_OFFSET + 0]) << 8) | \
((uint8 *)(ip_body))[IPV4_PKTLEN_OFFSET + 1])
/* IPV4 packet formats */
struct ipv4_addr {
uint8 addr[IPV4_ADDR_LEN];
} PACKED;
struct ipv4_hdr {
uint8 version_ihl; /* Version and Internet Header Length */
uint8 tos; /* Type Of Service */
uint16 tot_len; /* Number of bytes in packet (max 65535) */
uint16 id;
uint16 frag; /* 3 flag bits and fragment offset */
uint8 ttl; /* Time To Live */
uint8 prot; /* Protocol */
uint16 hdr_chksum; /* IP header checksum */
uint8 src_ip[IPV4_ADDR_LEN]; /* Source IP Address */
uint8 dst_ip[IPV4_ADDR_LEN]; /* Destination IP Address */
} PACKED;
/* IPV6 field offsets */
#define IPV6_PAYLOAD_LEN_OFFSET 4 /* payload length offset */
#define IPV6_NEXT_HDR_OFFSET 6 /* next header/protocol offset */
#define IPV6_HOP_LIMIT_OFFSET 7 /* hop limit offset */
#define IPV6_SRC_IP_OFFSET 8 /* src IP addr offset */
#define IPV6_DEST_IP_OFFSET 24 /* dst IP addr offset */
/* IPV6 field decodes */
#define IPV6_TRAFFIC_CLASS(ipv6_body) \
(((((uint8 *)(ipv6_body))[0] & 0x0f) << 4) | \
((((uint8 *)(ipv6_body))[1] & 0xf0) >> 4))
#define IPV6_FLOW_LABEL(ipv6_body) \
(((((uint8 *)(ipv6_body))[1] & 0x0f) << 16) | \
(((uint8 *)(ipv6_body))[2] << 8) | \
(((uint8 *)(ipv6_body))[3]))
#define IPV6_PAYLOAD_LEN(ipv6_body) \
((((uint8 *)(ipv6_body))[IPV6_PAYLOAD_LEN_OFFSET + 0] << 8) | \
((uint8 *)(ipv6_body))[IPV6_PAYLOAD_LEN_OFFSET + 1])
#define IPV6_NEXT_HDR(ipv6_body) \
(((uint8 *)(ipv6_body))[IPV6_NEXT_HDR_OFFSET])
#define IPV6_PROT(ipv6_body) IPV6_NEXT_HDR(ipv6_body)
#define IPV6_ADDR_LEN 16 /* IPV6 address length */
/* IPV4 TOS or IPV6 Traffic Classifier or 0 */
#define IP_TOS(ip_body) \
(IP_VER(ip_body) == IP_VER_4 ? IPV4_TOS(ip_body) : \
IP_VER(ip_body) == IP_VER_6 ? IPV6_TRAFFIC_CLASS(ip_body) : 0)
#undef PACKED
#if !defined(__GNUC__)
#pragma pack()
#endif
#endif /* _bcmip_h_ */
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