cregit-Linux how code gets into the kernel

Release 4.11 net/netfilter/xt_iprange.c

Directory: net/netfilter
/*
 *      xt_iprange - Netfilter module to match IP address ranges
 *
 *      (C) 2003 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
 *      (C) CC Computer Consultants GmbH, 2008
 *
 *      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.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter/xt_iprange.h>


static bool iprange_mt4(const struct sk_buff *skb, struct xt_action_param *par) { const struct xt_iprange_mtinfo *info = par->matchinfo; const struct iphdr *iph = ip_hdr(skb); bool m; if (info->flags & IPRANGE_SRC) { m = ntohl(iph->saddr) < ntohl(info->src_min.ip); m |= ntohl(iph->saddr) > ntohl(info->src_max.ip); m ^= !!(info->flags & IPRANGE_SRC_INV); if (m) { pr_debug("src IP %pI4 NOT in range %s%pI4-%pI4\n", &iph->saddr, (info->flags & IPRANGE_SRC_INV) ? "(INV) " : "", &info->src_min.ip, &info->src_max.ip); return false; } } if (info->flags & IPRANGE_DST) { m = ntohl(iph->daddr) < ntohl(info->dst_min.ip); m |= ntohl(iph->daddr) > ntohl(info->dst_max.ip); m ^= !!(info->flags & IPRANGE_DST_INV); if (m) { pr_debug("dst IP %pI4 NOT in range %s%pI4-%pI4\n", &iph->daddr, (info->flags & IPRANGE_DST_INV) ? "(INV) " : "", &info->dst_min.ip, &info->dst_max.ip); return false; } } return true; }

Contributors

PersonTokensPropCommitsCommitProp
Jan Engelhardt21987.60%337.50%
Harald Welte124.80%112.50%
Harvey Harrison83.20%112.50%
Alexey Dobriyan83.20%112.50%
Patrick McHardy20.80%112.50%
Thomas Jacob10.40%112.50%
Total250100.00%8100.00%


static inline int iprange_ipv6_lt(const struct in6_addr *a, const struct in6_addr *b) { unsigned int i; for (i = 0; i < 4; ++i) { if (a->s6_addr32[i] != b->s6_addr32[i]) return ntohl(a->s6_addr32[i]) < ntohl(b->s6_addr32[i]); } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Jan Engelhardt5975.64%266.67%
Thomas Jacob1924.36%133.33%
Total78100.00%3100.00%


static bool iprange_mt6(const struct sk_buff *skb, struct xt_action_param *par) { const struct xt_iprange_mtinfo *info = par->matchinfo; const struct ipv6hdr *iph = ipv6_hdr(skb); bool m; if (info->flags & IPRANGE_SRC) { m = iprange_ipv6_lt(&iph->saddr, &info->src_min.in6); m |= iprange_ipv6_lt(&info->src_max.in6, &iph->saddr); m ^= !!(info->flags & IPRANGE_SRC_INV); if (m) { pr_debug("src IP %pI6 NOT in range %s%pI6-%pI6\n", &iph->saddr, (info->flags & IPRANGE_SRC_INV) ? "(INV) " : "", &info->src_min.in6, &info->src_max.in6); return false; } } if (info->flags & IPRANGE_DST) { m = iprange_ipv6_lt(&iph->daddr, &info->dst_min.in6); m |= iprange_ipv6_lt(&info->dst_max.in6, &iph->daddr); m ^= !!(info->flags & IPRANGE_DST_INV); if (m) { pr_debug("dst IP %pI6 NOT in range %s%pI6-%pI6\n", &iph->daddr, (info->flags & IPRANGE_DST_INV) ? "(INV) " : "", &info->dst_min.in6, &info->dst_max.in6); return false; } } return true; }

Contributors

PersonTokensPropCommitsCommitProp
Jan Engelhardt14860.16%350.00%
Thomas Jacob9036.59%233.33%
Alexey Dobriyan83.25%116.67%
Total246100.00%6100.00%

static struct xt_match iprange_mt_reg[] __read_mostly = { { .name = "iprange", .revision = 1, .family = NFPROTO_IPV4, .match = iprange_mt4, .matchsize = sizeof(struct xt_iprange_mtinfo), .me = THIS_MODULE, }, { .name = "iprange", .revision = 1, .family = NFPROTO_IPV6, .match = iprange_mt6, .matchsize = sizeof(struct xt_iprange_mtinfo), .me = THIS_MODULE, }, };
static int __init iprange_mt_init(void) { return xt_register_matches(iprange_mt_reg, ARRAY_SIZE(iprange_mt_reg)); }

Contributors

PersonTokensPropCommitsCommitProp
Jan Engelhardt20100.00%1100.00%
Total20100.00%1100.00%


static void __exit iprange_mt_exit(void) { xt_unregister_matches(iprange_mt_reg, ARRAY_SIZE(iprange_mt_reg)); }

Contributors

PersonTokensPropCommitsCommitProp
Jan Engelhardt1684.21%150.00%
Harald Welte315.79%150.00%
Total19100.00%2100.00%

module_init(iprange_mt_init); module_exit(iprange_mt_exit); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>"); MODULE_AUTHOR("Jan Engelhardt <jengelh@medozas.de>"); MODULE_DESCRIPTION("Xtables: arbitrary IPv4 range matching"); MODULE_ALIAS("ipt_iprange"); MODULE_ALIAS("ip6t_iprange");

Overall Contributors

PersonTokensPropCommitsCommitProp
Jan Engelhardt57876.05%1157.89%
Thomas Jacob11014.47%315.79%
Harald Welte364.74%15.26%
Alexey Dobriyan162.11%15.26%
Phil Oester101.32%15.26%
Harvey Harrison81.05%15.26%
Patrick McHardy20.26%15.26%
Total760100.00%19100.00%
Directory: net/netfilter
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