Date: Fri, 26 Apr 2024 14:01:59 -0600 From: Warner Losh <imp@bsdimp.com> To: FreeBSD Net <freebsd-net@freebsd.org> Subject: Question about netinet6/in6.h Message-ID: <CANCZdfrDTktpyW9Ad=3-K9qnVYmY_wCnrmyizvgwJktVfHfV3Q@mail.gmail.com>
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--0000000000000d9ca5061705613d Content-Type: text/plain; charset="UTF-8" This has to be a FAQ I'm porting a program from Linux, I often see an error like: ../test/mock-ifaddrs.c:95:19: error: no member named 's6_addr32' in 'struct in6_addr' 95 | ipv6->sin6_addr.s6_addr32[3] = 0; | ~~~~~~~~~~~~~~~ ^ but yet, we kinda define them, but only for the kernel and boot loader: /* * IPv6 address */ struct in6_addr { union { uint8_t __u6_addr8[16]; uint16_t __u6_addr16[8]; uint32_t __u6_addr32[4]; } __u6_addr; /* 128-bit IP6 address */ }; #define s6_addr __u6_addr.__u6_addr8 #if defined(_KERNEL) || defined(_STANDALONE) /* XXX nonstandard */ #define s6_addr8 __u6_addr.__u6_addr8 #define s6_addr16 __u6_addr.__u6_addr16 #define s6_addr32 __u6_addr.__u6_addr32 #endif I'm wondering if anybody why it's like that? git blame suggests we imported that from kame, with only tweaks by people that are now deceased*.* Why not just expose them? Warner --0000000000000d9ca5061705613d Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable <div dir=3D"ltr"><div>This has to be a FAQ</div><div><br></div><div>I'm= porting a program from Linux, I often see an error like:</div><div>../test= /mock-ifaddrs.c:95:19: error: no member named 's6_addr32' in 's= truct in6_addr'<br>=C2=A0 =C2=A095 | =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0= =C2=A0 =C2=A0 =C2=A0 ipv6->sin6_addr.s6_addr32[3] =3D 0;<br>=C2=A0 =C2= =A0 =C2=A0 | =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 ~~~~~~= ~~~~~~~~~ ^</div><div>but yet, we kinda define them, but only for the kerne= l and boot loader:</div><div>/*<br>=C2=A0* IPv6 address<br>=C2=A0*/<br>stru= ct in6_addr {<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 union {<br>=C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 uint8_t =C2=A0 =C2=A0 =C2=A0 =C2=A0 = __u6_addr8[16];<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = uint16_t =C2=A0 =C2=A0 =C2=A0 =C2=A0__u6_addr16[8];<br>=C2=A0 =C2=A0 =C2=A0= =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 uint32_t =C2=A0 =C2=A0 =C2=A0 =C2=A0__u= 6_addr32[4];<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 } __u6_addr; =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0/* 128-bit IP6 address = */<br>};<br><br>#define s6_addr =C2=A0 __u6_addr.__u6_addr8<br>#if defined(= _KERNEL) || defined(_STANDALONE) /* XXX nonstandard */<br>#define s6_addr8 = =C2=A0__u6_addr.__u6_addr8<br>#define s6_addr16 __u6_addr.__u6_addr16<br>#d= efine s6_addr32 __u6_addr.__u6_addr32<br>#endif</div><div><br></div><div>I&= #39;m wondering if anybody why it's like that? git blame suggests we im= ported that from kame, with</div><div>only tweaks by people that are now de= ceased<b>.</b></div><div><b><br></b></div><div>Why not just expose them?<br= ></div><div><br></div><div>Warner<br></div></div> --0000000000000d9ca5061705613d--
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