ok
Stefan Sperling(s...@stsp.name) on 2017.06.24 07:09:20 +0200:
> The kernel rejects IPv6 destination addresses on point-to-point
> interfaces if the prefixlen is not 128. Because ifconfig defaults
> to prefixlen 64, configuring IPv6 on e.g. gif(4) requires an
> explicit prefix length, for instance:
>
> ifconfig gif0 inet6 ADDR1 ADDR2 prefixlen 128
>
> Without prefixlen we get: ifconfig: SIOCAIFADDR: Invalid argument
>
> However, this command works for IPv4:
>
> ifconfig gif0 ADDR1 ADDR2
>
> The netmask isn't forced to 255.255.255.255 by the kernel, though.
>
> Assuming the kernel is correct in enforcing IPv6 prefixlen 128,
> for whatever reason, then I suggest we make ifconfig figure out
> the required prefixlen by itself so this command works as it
> does for IPv4:
>
> ifconfig gif0 inet6 ADDR1 ADDR2
>
> ok?
>
> Index: ifconfig.c
> ===================================================================
> RCS file: /cvs/src/sbin/ifconfig/ifconfig.c,v
> retrieving revision 1.344
> diff -u -p -r1.344 ifconfig.c
> --- ifconfig.c 8 Jun 2017 19:23:39 -0000 1.344
> +++ ifconfig.c 24 Jun 2017 04:54:17 -0000
> @@ -803,9 +803,13 @@ nextarg:
> /*
> * Aggregatable address architecture defines all prefixes
> * are 64. So, it is convenient to set prefixlen to 64 if
> - * it is not specified.
> + * it is not specified. If we are setting a destination
> + * address on a point-to-point interface, 128 is required.
> */
> - setifprefixlen("64", 0);
> + if (setipdst && (flags & IFF_POINTOPOINT))
> + setifprefixlen("128", 0);
> + else
> + setifprefixlen("64", 0);
> /* in6_getprefix("64", MASK) if MASK is available here... */
> }
>
> @@ -1241,6 +1245,7 @@ void
> setifdstaddr(const char *addr, int param)
> {
> setaddr++;
> + setipdst++;
> afp->af_getaddr(addr, DSTADDR);
> }
>
>
