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inet: Add common IPv6 packet header macros 

Adds commonly used IPv6 packet header macros similar to what is available
on NetBSD and FreeBSD in sys/netinet/ip6.h and Android in
libc/include/netinet/ip6.h

Usage example IPV6_VERSION_MASK and IPV6_VERSION:

    if ((ip6->ip6_vfc & IPV6_VERSION_MASK) == IPV6_VERSION)
        return true;

Usage example IPV6_FLOWINFO_MASK:

    ip6->ip6_flow = (flow & IPV6_FLOWINFO_MASK);

The relevant standard is RFC2460 (Internet Protocol, Version 6
Specification). It defines the Internet Protocol version (IPV6_VERSION)
and reduced the size of the flow label field from 24 to 20 bits
(IPV6_FLOWLABEL_MASK). The traffic class and flow label fields together
make up the flow information (IPV6_FLOWINFO_MASK).

Tested on x86_64 GNU/Linux

Signed-off-by: Dan Luedtke <danrl@google.com>
Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
This commit is contained in:
Dan Luedtke 2024-12-04 11:50:22 -08:00 committed by Adhemerval Zanella
parent e59bdf63cb
commit 72dfba1be4
1 changed files with 11 additions and 0 deletions
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11
inet/netinet/ip6.h
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@ -46,6 +46,17 @@ struct ip6_hdr
#define ip6_hlim ip6_ctlun.ip6_un1.ip6_un1_hlim
#define ip6_hops ip6_ctlun.ip6_un1.ip6_un1_hlim
#define IPV6_VERSION 0x60
#define IPV6_VERSION_MASK 0xf0
#if __BYTE_ORDER == __BIG_ENDIAN
#define IPV6_FLOWINFO_MASK 0x0fffffff /* flow info (28 bits) */
#define IPV6_FLOWLABEL_MASK 0x000fffff /* flow label (20 bits) */
#else /* __BYTE_ORDER == __LITTLE_ENDIAN */
#define IPV6_FLOWINFO_MASK 0xffffff0f /* flow info (28 bits) */
#define IPV6_FLOWLABEL_MASK 0xffff0f00 /* flow label (20 bits) */
#endif
/* Generic extension header. */
struct ip6_ext
{