--- a/Documentation/Configure.help +++ b/Documentation/Configure.help @@ -2986,6 +2986,14 @@ CONFIG_IP_NF_MATCH_TOS If you want to compile it as a module, say M here and read . If unsure, say `N'. +iprange match support +CONFIG_IP_NF_MATCH_IPRANGE + This option makes possible to match IP addresses against + IP address ranges. + + If you want to compile it as a module, say M here and read + . If unsure, say `N'. + Condition variable match support CONFIG_IP_NF_MATCH_CONDITION This option allows you to match firewall rules against condition --- /dev/null +++ b/include/linux/netfilter_ipv4/ipt_iprange.h @@ -0,0 +1,23 @@ +#ifndef _IPT_IPRANGE_H +#define _IPT_IPRANGE_H + +#define IPRANGE_SRC 0x01 /* Match source IP address */ +#define IPRANGE_DST 0x02 /* Match destination IP address */ +#define IPRANGE_SRC_INV 0x10 /* Negate the condition */ +#define IPRANGE_DST_INV 0x20 /* Negate the condition */ + +struct ipt_iprange { + /* Inclusive: network order. */ + u_int32_t min_ip, max_ip; +}; + +struct ipt_iprange_info +{ + struct ipt_iprange src; + struct ipt_iprange dst; + + /* Flags from above */ + u_int8_t flags; +}; + +#endif /* _IPT_IPRANGE_H */ --- a/net/ipv4/netfilter/Config.in +++ b/net/ipv4/netfilter/Config.in @@ -24,6 +24,7 @@ tristate 'IP tables support (required fo if [ "$CONFIG_IP_NF_IPTABLES" != "n" ]; then # The simple matches. dep_tristate ' limit match support' CONFIG_IP_NF_MATCH_LIMIT $CONFIG_IP_NF_IPTABLES + dep_tristate ' IP range match support' CONFIG_IP_NF_MATCH_IPRANGE $CONFIG_IP_NF_IPTABLES dep_tristate ' quota match support' CONFIG_IP_NF_MATCH_QUOTA $CONFIG_IP_NF_IPTABLES dep_tristate ' MAC address match support' CONFIG_IP_NF_MATCH_MAC $CONFIG_IP_NF_IPTABLES dep_tristate ' Packet type match support' CONFIG_IP_NF_MATCH_PKTTYPE $CONFIG_IP_NF_IPTABLES --- /dev/null +++ b/net/ipv4/netfilter/ipt_iprange.c @@ -0,0 +1,101 @@ +/* + * iptables module to match IP address ranges + * (c) 2003 Jozsef Kadlecsik + * + * Released under the terms of GNU GPLv2. + * + */ +#include +#include +#include +#include +#include + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Jozsef Kadlecsik "); +MODULE_DESCRIPTION("iptables arbitrary IP range match module"); + +#if 0 +#define DEBUGP printk +#else +#define DEBUGP(format, args...) +#endif + +static int +match(const struct sk_buff *skb, + const struct net_device *in, + const struct net_device *out, + const void *matchinfo, + int offset, + const void *hdr, + u_int16_t datalen, + int *hotdrop) +{ + const struct ipt_iprange_info *info = matchinfo; + const struct iphdr *iph = skb->nh.iph; + + + 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)) { + DEBUGP("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 0; + } + } + 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)) { + DEBUGP("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 0; + } + } + return 1; +} + +static int check(const char *tablename, + const struct ipt_ip *ip, + void *matchinfo, + unsigned int matchsize, + unsigned int hook_mask) +{ + /* verify size */ + if (matchsize != IPT_ALIGN(sizeof(struct ipt_iprange_info))) + return 0; + + return 1; +} + +static struct ipt_match iprange_match = +{ + .list = { NULL, NULL }, + .name = "iprange", + .match = &match, + .checkentry = &check, + .destroy = NULL, + .me = THIS_MODULE +}; + +static int __init init(void) +{ + return ipt_register_match(&iprange_match); +} + +static void __exit fini(void) +{ + ipt_unregister_match(&iprange_match); +} + +module_init(init); +module_exit(fini); --- a/net/ipv4/netfilter/Makefile +++ b/net/ipv4/netfilter/Makefile @@ -75,6 +75,7 @@ obj-$(CONFIG_IP_NF_NAT) += iptable_nat.o # matches obj-$(CONFIG_IP_NF_MATCH_HELPER) += ipt_helper.o obj-$(CONFIG_IP_NF_MATCH_LIMIT) += ipt_limit.o +obj-$(CONFIG_IP_NF_MATCH_IPRANGE) += ipt_iprange.o obj-$(CONFIG_IP_NF_MATCH_QUOTA) += ipt_quota.o obj-$(CONFIG_IP_NF_MATCH_MARK) += ipt_mark.o obj-$(CONFIG_IP_NF_MATCH_MAC) += ipt_mac.o