cregit-Linux how code gets into the kernel

Release 4.11 net/netfilter/xt_hl.c

Directory: net/netfilter
/*
 * IP tables module for matching the value of the TTL
 * (C) 2000,2001 by Harald Welte <laforge@netfilter.org>
 *
 * Hop Limit matching module
 * (C) 2001-2002 Maciej Soltysiak <solt@dns.toxicfilms.tv>
 *
 * 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/ip.h>
#include <linux/ipv6.h>
#include <linux/module.h>
#include <linux/skbuff.h>

#include <linux/netfilter/x_tables.h>
#include <linux/netfilter_ipv4/ipt_ttl.h>
#include <linux/netfilter_ipv6/ip6t_hl.h>

MODULE_AUTHOR("Maciej Soltysiak <solt@dns.toxicfilms.tv>");
MODULE_DESCRIPTION("Xtables: Hoplimit/TTL field match");
MODULE_LICENSE("GPL");
MODULE_ALIAS("ipt_ttl");
MODULE_ALIAS("ip6t_hl");


static bool ttl_mt(const struct sk_buff *skb, struct xt_action_param *par) { const struct ipt_ttl_info *info = par->matchinfo; const u8 ttl = ip_hdr(skb)->ttl; switch (info->mode) { case IPT_TTL_EQ: return ttl == info->ttl; case IPT_TTL_NE: return ttl != info->ttl; case IPT_TTL_LT: return ttl < info->ttl; case IPT_TTL_GT: return ttl > info->ttl; } return false; }

Contributors

PersonTokensPropCommitsCommitProp
Jan Engelhardt89100.00%2100.00%
Total89100.00%2100.00%


static bool hl_mt6(const struct sk_buff *skb, struct xt_action_param *par) { const struct ip6t_hl_info *info = par->matchinfo; const struct ipv6hdr *ip6h = ipv6_hdr(skb); switch (info->mode) { case IP6T_HL_EQ: return ip6h->hop_limit == info->hop_limit; case IP6T_HL_NE: return ip6h->hop_limit != info->hop_limit; case IP6T_HL_LT: return ip6h->hop_limit < info->hop_limit; case IP6T_HL_GT: return ip6h->hop_limit > info->hop_limit; } return false; }

Contributors

PersonTokensPropCommitsCommitProp
Harald Welte8587.63%112.50%
Jan Engelhardt88.25%562.50%
Arnaldo Carvalho de Melo33.09%112.50%
Patrick McHardy11.03%112.50%
Total97100.00%8100.00%

static struct xt_match hl_mt_reg[] __read_mostly = { { .name = "ttl", .revision = 0, .family = NFPROTO_IPV4, .match = ttl_mt, .matchsize = sizeof(struct ipt_ttl_info), .me = THIS_MODULE, }, { .name = "hl", .revision = 0, .family = NFPROTO_IPV6, .match = hl_mt6, .matchsize = sizeof(struct ip6t_hl_info), .me = THIS_MODULE, }, };
static int __init hl_mt_init(void) { return xt_register_matches(hl_mt_reg, ARRAY_SIZE(hl_mt_reg)); }

Contributors

PersonTokensPropCommitsCommitProp
Harald Welte1260.00%150.00%
Jan Engelhardt840.00%150.00%
Total20100.00%2100.00%


static void __exit hl_mt_exit(void) { xt_unregister_matches(hl_mt_reg, ARRAY_SIZE(hl_mt_reg)); }

Contributors

PersonTokensPropCommitsCommitProp
Harald Welte1157.89%150.00%
Jan Engelhardt842.11%150.00%
Total19100.00%2100.00%

module_init(hl_mt_init); module_exit(hl_mt_exit);

Overall Contributors

PersonTokensPropCommitsCommitProp
Jan Engelhardt19052.34%857.14%
Harald Welte15041.32%17.14%
Art Haas123.31%17.14%
Patrick McHardy82.20%321.43%
Arnaldo Carvalho de Melo30.83%17.14%
Total363100.00%14100.00%
Directory: net/netfilter
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