ip6.h

/* -*- mode: c; c-basic-offset: 4 -*- */
#ifndef CLICKNET_IP6_H
#define CLICKNET_IP6_H
//#include <clicknet/ip.h>
/* get struct in6_addr */
#include <click/cxxprotect.h>
CLICK_CXX_PROTECT
 
#if CLICK_LINUXMODULE
# include <net/checksum.h>
# include <linux/in6.h>
#else
# include <sys/types.h>
# undef true
# include <netinet/in.h>
# define true linux_true
#endif
 
struct click_ip6 {
    union {
        struct {
            uint32_t ip6_un1_flow;      /* 0-3   bits 0-3: version == 6      */
                                        /*       bits 4-11: traffic class    */
                                        /*         bits 4-9: DSCP            */
                                        /*         bits 10-11: ECN           */
                                        /*       bits 12-31: flow label      */
            uint16_t ip6_un1_plen;      /* 4-5   payload length              */
            uint8_t ip6_un1_nxt;        /* 6     next header                 */
            uint8_t ip6_un1_hlim;       /* 7     hop limit                   */
        } ip6_un1;
        uint8_t ip6_un2_vfc;            /* 0     bits 0-3: version == 6      */
                                        /*       bits 4-7: top 4 class bits  */
        struct {
#if CLICK_BYTE_ORDER == CLICK_BIG_ENDIAN
            unsigned ip6_un3_v : 4;     /* 0     version == 6                */
            unsigned ip6_un3_fc : 4;    /*       header length               */
#elif CLICK_BYTE_ORDER == CLICK_LITTLE_ENDIAN
            unsigned ip6_un3_fc : 4;    /* 0     header length               */
            unsigned ip6_un3_v : 4;     /*       version == 6                */
#endif
        } ip6_un3;
    } ip6_ctlun;
    struct in6_addr ip6_src;    /* 8-23  source address */
    struct in6_addr ip6_dst;    /* 24-39 dest address */
} CLICK_SIZE_PACKED_ATTRIBUTE;
 
struct click_ip6_eh {
        uint8_t nxt;
        uint8_t len;
} CLICK_SIZE_PACKED_ATTRIBUTE;
 
#define ip6_v                   ip6_ctlun.ip6_un3.ip6_un3_v
#define ip6_vfc                 ip6_ctlun.ip6_un2_vfc
#define ip6_flow                ip6_ctlun.ip6_un1.ip6_un1_flow
#define ip6_plen                ip6_ctlun.ip6_un1.ip6_un1_plen
#define ip6_nxt                 ip6_ctlun.ip6_un1.ip6_un1_nxt
#define ip6_hlim                ip6_ctlun.ip6_un1.ip6_un1_hlim
 
#define IP6_EH_HOPBYHOP          0
#define IP6_EH_ROUTING       43
#define IP6_EH_FRAGMENT          44
#define IP6_EH_AH            51
#define IP6_EH_ESP           50
#define IP6_EH_NONXT         59
#define IP6_EH_DST           60
#define IP6_EH_MOBILITY      135
 
#define IP6_FLOW_MASK           0x000FFFFFU
#define IP6_FLOW_SHIFT          0
#define IP6_CLASS_MASK          0x0FF00000U
#define IP6_CLASS_SHIFT         20
#define IP6_DSCP_MASK           0x0FC00000U
#define IP6_DSCP_SHIFT          22
#define IP6_V_MASK              0xF0000000U
#define IP6_V_SHIFT             28
 
#define IP6_CHECK_V(hdr)        (((hdr).ip6_vfc & htonl(IP6_V_MASK)) == htonl(6 << IP6_V_SHIFT))
 
#ifndef IP6PROTO_FRAGMENT
#define IP6PROTO_FRAGMENT 0x2c
#endif
struct click_ip6_fragment {
    uint8_t ip6_frag_nxt;
    uint8_t ip6_frag_reserved;
    uint16_t ip6_frag_offset;
#define IP6_MF          0x0001
#define IP6_OFFMASK     0xFFF8
                                        /*       bits 0-12: Fragment offset  */
                                        /*       bit 13-14: reserved         */
                                        /*       bit 15: More Fragment       */
    uint32_t ip6_frag_id;
} CLICK_SIZE_PACKED_ATTRIBUTE;
 
#ifndef IP6PROTO_SEGMENT_ROUTING
#define IP6PROTO_SEGMENT_ROUTING 4
#endif
struct click_ip6_sr {
        uint8_t ip6_sr_next;
        uint8_t ip6_hdrlen;
        uint8_t type; // Always 4 for Segment Routing
        uint8_t segment_left;
        uint8_t last_entry; // Number of segments in the Segment List
        uint8_t flags;
        uint16_t tag;
        struct in6_addr segments[0]; // Segment List (variable length)
} CLICK_SIZE_PACKED_ATTRIBUTE;
 
struct click_sr6_tlv {
        uint8_t type;
        uint8_t len;
        uint8_t value[0];
} CLICK_SIZE_PACKED_ATTRIBUTE;
 
uint16_t in6_fast_cksum(const struct in6_addr *saddr,
                        const struct in6_addr *daddr,
                        uint16_t len,
                        uint8_t proto,
                        uint16_t ori_csum,
                        const unsigned char *addr,
                        uint16_t len2);
 
uint16_t in6_cksum(const struct in6_addr *saddr,
                   const struct in6_addr *daddr,
                   uint16_t len,
                   uint8_t proto,
                   uint16_t ori_csum,
                   unsigned char *addr,
                   uint16_t len2);
 
CLICK_CXX_UNPROTECT
#include <click/cxxunprotect.h>
#endif