diff options
Diffstat (limited to 'net/netfilter')
| -rw-r--r-- | net/netfilter/Kconfig | 11 | ||||
| -rw-r--r-- | net/netfilter/Makefile | 1 | ||||
| -rw-r--r-- | net/netfilter/xt_iprange.c | 76 |
3 files changed, 88 insertions, 0 deletions
diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig index 79d71437e31..daf5b881064 100644 --- a/net/netfilter/Kconfig +++ b/net/netfilter/Kconfig @@ -567,6 +567,17 @@ config NETFILTER_XT_MATCH_HELPER To compile it as a module, choose M here. If unsure, say Y. +config NETFILTER_XT_MATCH_IPRANGE + tristate '"iprange" address range match support' + depends on NETFILTER_XTABLES + depends on NETFILTER_ADVANCED + ---help--- + This option adds a "iprange" match, which allows you to match based on + an IP address range. (Normal iptables only matches on single addresses + with an optional mask.) + + If unsure, say M. + config NETFILTER_XT_MATCH_LENGTH tristate '"length" match support' depends on NETFILTER_XTABLES diff --git a/net/netfilter/Makefile b/net/netfilter/Makefile index 3b9ea8fb3a0..c910caee0d4 100644 --- a/net/netfilter/Makefile +++ b/net/netfilter/Makefile @@ -63,6 +63,7 @@ obj-$(CONFIG_NETFILTER_XT_MATCH_DSCP) += xt_dscp.o obj-$(CONFIG_NETFILTER_XT_MATCH_ESP) += xt_esp.o obj-$(CONFIG_NETFILTER_XT_MATCH_HASHLIMIT) += xt_hashlimit.o obj-$(CONFIG_NETFILTER_XT_MATCH_HELPER) += xt_helper.o +obj-$(CONFIG_NETFILTER_XT_MATCH_IPRANGE) += xt_iprange.o obj-$(CONFIG_NETFILTER_XT_MATCH_LENGTH) += xt_length.o obj-$(CONFIG_NETFILTER_XT_MATCH_LIMIT) += xt_limit.o obj-$(CONFIG_NETFILTER_XT_MATCH_MAC) += xt_mac.o diff --git a/net/netfilter/xt_iprange.c b/net/netfilter/xt_iprange.c new file mode 100644 index 00000000000..c57a6cf8a08 --- /dev/null +++ b/net/netfilter/xt_iprange.c @@ -0,0 +1,76 @@ +/* + * xt_iprange - Netfilter module to match IP address ranges + * + * (C) 2003 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ +#include <linux/module.h> +#include <linux/skbuff.h> +#include <linux/ip.h> +#include <linux/netfilter/x_tables.h> +#include <linux/netfilter_ipv4/ipt_iprange.h> + +static bool +iprange_mt_v0(const struct sk_buff *skb, const struct net_device *in, + const struct net_device *out, const struct xt_match *match, + const void *matchinfo, int offset, unsigned int protoff, + bool *hotdrop) +{ + const struct ipt_iprange_info *info = matchinfo; + const struct iphdr *iph = ip_hdr(skb); + + if (info->flags & IPRANGE_SRC) { + if ((ntohl(iph->saddr) < ntohl(info->src.min_ip) + || ntohl(iph->saddr) > ntohl(info->src.max_ip)) + ^ !!(info->flags & IPRANGE_SRC_INV)) { + pr_debug("src IP %u.%u.%u.%u NOT in range %s" + "%u.%u.%u.%u-%u.%u.%u.%u\n", + NIPQUAD(iph->saddr), + info->flags & IPRANGE_SRC_INV ? "(INV) " : "", + NIPQUAD(info->src.min_ip), + NIPQUAD(info->src.max_ip)); + return false; + } + } + if (info->flags & IPRANGE_DST) { + if ((ntohl(iph->daddr) < ntohl(info->dst.min_ip) + || ntohl(iph->daddr) > ntohl(info->dst.max_ip)) + ^ !!(info->flags & IPRANGE_DST_INV)) { + pr_debug("dst IP %u.%u.%u.%u NOT in range %s" + "%u.%u.%u.%u-%u.%u.%u.%u\n", + NIPQUAD(iph->daddr), + info->flags & IPRANGE_DST_INV ? "(INV) " : "", + NIPQUAD(info->dst.min_ip), + NIPQUAD(info->dst.max_ip)); + return false; + } + } + return true; +} + +static struct xt_match iprange_mt_reg __read_mostly = { + .name = "iprange", + .family = AF_INET, + .match = iprange_mt_v0, + .matchsize = sizeof(struct ipt_iprange_info), + .me = THIS_MODULE +}; + +static int __init iprange_mt_init(void) +{ + return xt_register_match(&iprange_mt_reg); +} + +static void __exit iprange_mt_exit(void) +{ + xt_unregister_match(&iprange_mt_reg); +} + +module_init(iprange_mt_init); +module_exit(iprange_mt_exit); +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>"); +MODULE_DESCRIPTION("Xtables: arbitrary IPv4 range matching"); |