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- struct ip6hdr {
- union {
- struct ip6hdrctl {
- u_int32_t ctl6_flow; /* 24 bits of flow-ID */
- u_int16_t ctl6_plen; /* payload length */
- u_int8_t ctl6_nxt; /* next header */
- u_int8_t ctl6_hlim; /* hop limit */
- } un_ctl6;
- u_int8_t un_vfc; /* 4 bits version, 4 bits reserved */
- } ip6_ctlun;
- struct in6_addr ip6_src; /* source address */
- struct in6_addr ip6_dst; /* destination address */
- };
- #define ip6_vfc ip6_ctlun.un_vfc
- #define ip6_flow ip6_ctlun.un_ctl6.ctl6_flow
- #define ip6_plen ip6_ctlun.un_ctl6.ctl6_plen
- #define ip6_nxt ip6_ctlun.un_ctl6.ctl6_nxt
- #define ip6_hlim ip6_ctlun.un_ctl6.ctl6_hlim
- #define ip6_hops ip6_ctlun.un_ctl6.ctl6_hlim
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