[NETFILTER]: xt_iprange match, revision 1
Adds IPv6 support to xt_iprange, making it possible to match on IPv6 address ranges with ip6tables. Signed-off-by: Jan Engelhardt <jengelh@computergmbh.de> Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
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1 changed files with 113 additions and 9 deletions
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@ -2,6 +2,7 @@
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* xt_iprange - Netfilter module to match IP address ranges
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*
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* (C) 2003 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
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* (C) CC Computer Consultants GmbH, 2008
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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@ -10,6 +11,7 @@
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#include <linux/module.h>
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#include <linux/skbuff.h>
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#include <linux/ip.h>
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#include <linux/ipv6.h>
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#include <linux/netfilter/x_tables.h>
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#include <linux/netfilter_ipv4/ipt_iprange.h>
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@ -51,26 +53,128 @@ iprange_mt_v0(const struct sk_buff *skb, const struct net_device *in,
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return true;
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}
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static struct xt_match iprange_mt_reg __read_mostly = {
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.name = "iprange",
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.family = AF_INET,
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.match = iprange_mt_v0,
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.matchsize = sizeof(struct ipt_iprange_info),
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.me = THIS_MODULE
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static bool
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iprange_mt4(const struct sk_buff *skb, const struct net_device *in,
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const struct net_device *out, const struct xt_match *match,
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const void *matchinfo, int offset, unsigned int protoff,
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bool *hotdrop)
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{
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const struct xt_iprange_mtinfo *info = matchinfo;
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const struct iphdr *iph = ip_hdr(skb);
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bool m;
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if (info->flags & IPRANGE_SRC) {
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m = ntohl(iph->saddr) < ntohl(info->src_min.ip);
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m |= ntohl(iph->saddr) > ntohl(info->src_max.ip);
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m ^= info->flags & IPRANGE_SRC_INV;
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if (m) {
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pr_debug("src IP " NIPQUAD_FMT " NOT in range %s"
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NIPQUAD_FMT "-" NIPQUAD_FMT "\n",
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NIPQUAD(iph->saddr),
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(info->flags & IPRANGE_SRC_INV) ? "(INV) " : "",
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NIPQUAD(info->src_max.ip),
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NIPQUAD(info->src_max.ip));
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return false;
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}
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}
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if (info->flags & IPRANGE_DST) {
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m = ntohl(iph->daddr) < ntohl(info->dst_min.ip);
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m |= ntohl(iph->daddr) > ntohl(info->dst_max.ip);
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m ^= info->flags & IPRANGE_DST_INV;
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if (m) {
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pr_debug("dst IP " NIPQUAD_FMT " NOT in range %s"
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NIPQUAD_FMT "-" NIPQUAD_FMT "\n",
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NIPQUAD(iph->daddr),
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(info->flags & IPRANGE_DST_INV) ? "(INV) " : "",
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NIPQUAD(info->dst_min.ip),
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NIPQUAD(info->dst_max.ip));
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return false;
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}
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}
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return true;
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}
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static inline int
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iprange_ipv6_sub(const struct in6_addr *a, const struct in6_addr *b)
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{
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unsigned int i;
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int r;
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for (i = 0; i < 4; ++i) {
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r = a->s6_addr32[i] - b->s6_addr32[i];
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if (r != 0)
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return r;
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}
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return 0;
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}
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static bool
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iprange_mt6(const struct sk_buff *skb, const struct net_device *in,
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const struct net_device *out, const struct xt_match *match,
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const void *matchinfo, int offset, unsigned int protoff,
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bool *hotdrop)
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{
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const struct xt_iprange_mtinfo *info = matchinfo;
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const struct ipv6hdr *iph = ipv6_hdr(skb);
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bool m;
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if (info->flags & IPRANGE_SRC) {
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m = iprange_ipv6_sub(&iph->saddr, &info->src_min.in6) < 0;
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m |= iprange_ipv6_sub(&iph->saddr, &info->src_max.in6) > 0;
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m ^= info->flags & IPRANGE_SRC_INV;
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if (m)
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return false;
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}
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if (info->flags & IPRANGE_DST) {
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m = iprange_ipv6_sub(&iph->daddr, &info->dst_min.in6) < 0;
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m |= iprange_ipv6_sub(&iph->daddr, &info->dst_max.in6) > 0;
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m ^= info->flags & IPRANGE_DST_INV;
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if (m)
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return false;
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}
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return true;
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}
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static struct xt_match iprange_mt_reg[] __read_mostly = {
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{
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.name = "iprange",
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.revision = 0,
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.family = AF_INET,
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.match = iprange_mt_v0,
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.matchsize = sizeof(struct ipt_iprange_info),
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.me = THIS_MODULE,
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},
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{
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.name = "iprange",
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.revision = 1,
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.family = AF_INET6,
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.match = iprange_mt4,
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.matchsize = sizeof(struct xt_iprange_mtinfo),
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.me = THIS_MODULE,
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},
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{
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.name = "iprange",
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.revision = 1,
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.family = AF_INET6,
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.match = iprange_mt6,
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.matchsize = sizeof(struct xt_iprange_mtinfo),
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.me = THIS_MODULE,
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},
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};
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static int __init iprange_mt_init(void)
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{
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return xt_register_match(&iprange_mt_reg);
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return xt_register_matches(iprange_mt_reg, ARRAY_SIZE(iprange_mt_reg));
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}
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static void __exit iprange_mt_exit(void)
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{
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xt_unregister_match(&iprange_mt_reg);
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xt_unregister_matches(iprange_mt_reg, ARRAY_SIZE(iprange_mt_reg));
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}
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module_init(iprange_mt_init);
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module_exit(iprange_mt_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");
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MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>, Jan Engelhardt <jengelh@computergmbh.de>");
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MODULE_DESCRIPTION("Xtables: arbitrary IPv4 range matching");
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