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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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[-- Attachment #1 --]
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

[-- Attachment #2 --]
<div dir="ltr"><div>This has to be a FAQ</div><div><br></div><div>I&#39;m porting a program from Linux, I often see an error like:</div><div>../test/mock-ifaddrs.c:95:19: error: no member named &#39;s6_addr32&#39; in &#39;struct in6_addr&#39;<br>   95 |                 ipv6-&gt;sin6_addr.s6_addr32[3] = 0;<br>      |                 ~~~~~~~~~~~~~~~ ^</div><div>but yet, we kinda define them, but only for the kernel and boot loader:</div><div>/*<br> * IPv6 address<br> */<br>struct in6_addr {<br>        union {<br>                uint8_t         __u6_addr8[16];<br>                uint16_t        __u6_addr16[8];<br>                uint32_t        __u6_addr32[4];<br>        } __u6_addr;                    /* 128-bit IP6 address */<br>};<br><br>#define s6_addr   __u6_addr.__u6_addr8<br>#if defined(_KERNEL) || defined(_STANDALONE) /* XXX nonstandard */<br>#define s6_addr8  __u6_addr.__u6_addr8<br>#define s6_addr16 __u6_addr.__u6_addr16<br>#define s6_addr32 __u6_addr.__u6_addr32<br>#endif</div><div><br></div><div>I&#39;m wondering if anybody why it&#39;s like that? git blame suggests we imported that from kame, with</div><div>only tweaks by people that are now deceased<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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