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ipxlat: support all RFC 6052 prefix lengths

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Also fixes a bug that caused /40 prefixes to be rejected (regardless of
translation engine in use).
This commit is contained in:
Tore Anderson
2026-04-11 23:20:34 +02:00
parent 4e1c7fa71f
commit 009c3f74a9
1 changed files with 19 additions and 4 deletions
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clatd
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@@ -851,6 +851,7 @@ if(!$CFG{"plat-prefix"}) {
$ip->prefixlen() != 64 and
$ip->prefixlen() != 56 and
$ip->prefixlen() != 48 and
$ip->prefixlen() != 40 and
$ip->prefixlen() != 32) {
err("PLAT prefix $CFG{'plat-prefix'} has an invalid prefix length ",
"(see RFC 6052 section 2.2)");
@@ -934,9 +935,23 @@ if(!cfg("xlat-engine") and (-e $nat46_controlfile)) {
} elsif(!cfg("xlat-engine") and can_run(cfg("cmd-ipxlat-ctl"))) {
p("Using translation engine: ipxlat");
$CFG{"xlat-engine"} = "ipxlat";
# FIXME: handle non-/96 prefix lengths
$CFG{"plat-prefix"} =~ m|^(.*?):*/96|;
$CFG{"internal-clat-v6-addr"} = Net::IP->new($1 . ":" . $CFG{"clat-v4-addr"}, 6)->ip;
my $pfx = Net::IP->new($CFG{"plat-prefix"});
my $fmt = $pfx->ip;
if($pfx->prefixlen == 96) {
$fmt =~ s/0000:0000$/%02x%02x:%02x%02x/;
} elsif($pfx->prefixlen == 64) {
$fmt =~ s/00:0000:0000:0000$/%02x:%02x%02x:%02x00:0000/;
} elsif($pfx->prefixlen == 56) {
$fmt =~ s/00:0000:0000:0000:0000$/%02x:00%02x:%02x%02x:0000:0000/;
} elsif($pfx->prefixlen == 48) {
$fmt =~ s/0000:0000:0000:0000:0000$/%02x%02x:00%02x:%02x00:0000:0000/;
} elsif($pfx->prefixlen == 40) {
$fmt =~ s/00:0000:0000:0000:0000:0000$/%02x:%02x%02x:00%02x:0000:0000:0000/;
} elsif($pfx->prefixlen == 32) {
$fmt =~ s/0000:0000:0000:0000:0000:0000$/%02x%02x:%02x%02x:0000:0000:0000:0000/;
}
my $ip = sprintf($fmt, split(/\./, $CFG{"clat-v4-addr"}));
$CFG{"internal-clat-v6-addr"} = Net::IP->new($ip)->short;
p("Using internal CLAT IPv6 address: ", $CFG{"internal-clat-v6-addr"});
} elsif(!cfg("xlat-engine") and can_run(cfg("cmd-tayga"))) {
p("Using translation engine: TAYGA");
@@ -1114,7 +1129,7 @@ if(cfgint("ctmark")) {
" iif ", cfg("clat-dev"),
" ip6 saddr ", cfg("internal-clat-v6-addr"),
" ip6 daddr ", cfg("plat-prefix"),
" snat to ", cfg("clat-v6-addr");
" snat to ", cfg("clat-v6-addr");
}
close($fd) or err("'nft -f-' failed");
$cleanup_remove_nftable = 1;