Re: pgsql/src/backend/parser gram.y

Christopher Kings-Lynne wrote:
> Can you give me a hint where to look?  I've looked at the code and throught
> he man pages and can't find the actual structure documented.  It's version
> 4.4 of FreeBSD, and it has ipv6 compiled in (ifconfig -a proves that).
>
> I'm searching /usr/src right now...

I see:

    netinet6/in6.h:132:#define s6_addr8  __u6_addr.__u6_addr8

I have in that file:

    struct in6_addr {
        union {
            u_int8_t   __u6_addr8[16];
            u_int16_t  __u6_addr16[8];
            u_int32_t  __u6_addr32[4];
        } __u6_addr;            /* 128-bit IP6 address */
    };

    #define s6_addr   __u6_addr.__u6_addr8
    #define s6_addr8  __u6_addr.__u6_addr8
    #define s6_addr16 __u6_addr.__u6_addr16
    #define s6_addr32 __u6_addr.__u6_addr32

and struct in6_addr is part of struct sockaddr_in6:

    struct sockaddr_in6 {
        u_int8_t    sin6_len;   /* length of this struct(sa_family_t)*/
        u_int8_t    sin6_family;    /* AF_INET6 (sa_family_t) */
        u_int16_t   sin6_port;  /* Transport layer port # (in_port_t)*/
        u_int32_t   sin6_flowinfo;  /* IP6 flow information */
        struct in6_addr sin6_addr;  /* IP6 address */
            ^^^^^^^^^^^^^^^^^^^^^^^^^
        u_int32_t   sin6_scope_id;  /* intface scope id */
    };

Now, do we support IP6 anyway in the backend?  If we don't, do we need
this code?  I see a test for AF_INET6, but I don't see that anywhere
else in the backend code.  Perhaps that 'case' needs to be removed and
we can do IP6 all at once in the future.

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