To: FreeBSD Net <freebsd-net@freebsd.org> Subject: Question about netinet6/in6.h
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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
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<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>
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