diff options
Diffstat (limited to 'kernel/net/netfilter/ipset/pfxlen.c')
-rw-r--r-- | kernel/net/netfilter/ipset/pfxlen.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/kernel/net/netfilter/ipset/pfxlen.c b/kernel/net/netfilter/ipset/pfxlen.c index 23f8c81..b57a856 100644 --- a/kernel/net/netfilter/ipset/pfxlen.c +++ b/kernel/net/netfilter/ipset/pfxlen.c @@ -289,3 +289,24 @@ const union nf_inet_addr ip_set_hostmask_map[] = { E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF), }; EXPORT_SYMBOL_GPL(ip_set_hostmask_map); + +/* Find the largest network which matches the range from left, in host order. */ +u32 +ip_set_range_to_cidr(u32 from, u32 to, u8 *cidr) +{ + u32 last; + u8 i; + + for (i = 1; i < 32; i++) { + if ((from & ip_set_hostmask(i)) != from) + continue; + last = from | ~ip_set_hostmask(i); + if (!after(last, to)) { + *cidr = i; + return last; + } + } + *cidr = 32; + return from; +} +EXPORT_SYMBOL_GPL(ip_set_range_to_cidr); |