From 563d36eb3fb22dd04da9aa6f12e1b9ba0ac115f3 Mon Sep 17 00:00:00 2001 From: Jan Engelhardt Date: Wed, 18 Feb 2009 18:38:40 +0100 Subject: netfilter: Combine ipt_TTL and ip6t_HL source Suggested by: James King Similarly to commit c9fd49680954714473d6cbd2546d6ff120f96840, merge TTL and HL. Since HL does not depend on any IPv6-specific function, no new module dependencies would arise. With slight adjustments to the Kconfig help text. Signed-off-by: Jan Engelhardt Signed-off-by: Patrick McHardy --- net/ipv6/netfilter/Kconfig | 17 -------- net/ipv6/netfilter/Makefile | 1 - net/ipv6/netfilter/ip6t_HL.c | 95 -------------------------------------------- 3 files changed, 113 deletions(-) delete mode 100644 net/ipv6/netfilter/ip6t_HL.c (limited to 'net/ipv6') diff --git a/net/ipv6/netfilter/Kconfig b/net/ipv6/netfilter/Kconfig index 53ea512..6a42a96 100644 --- a/net/ipv6/netfilter/Kconfig +++ b/net/ipv6/netfilter/Kconfig @@ -170,23 +170,6 @@ config IP6_NF_MANGLE To compile it as a module, choose M here. If unsure, say N. -config IP6_NF_TARGET_HL - tristate 'HL (hoplimit) target support' - depends on IP6_NF_MANGLE - depends on NETFILTER_ADVANCED - help - This option adds a `HL' target, which enables the user to decrement - the hoplimit value of the IPv6 header or set it to a given (lower) - value. - - While it is safe to decrement the hoplimit value, this option also - enables functionality to increment and set the hoplimit value of the - IPv6 header to arbitrary values. This is EXTREMELY DANGEROUS since - you can easily create immortal packets that loop forever on the - network. - - To compile it as a module, choose M here. If unsure, say N. - config IP6_NF_RAW tristate 'raw table support (required for TRACE)' depends on NETFILTER_ADVANCED diff --git a/net/ipv6/netfilter/Makefile b/net/ipv6/netfilter/Makefile index 3f17c94..61a4570 100644 --- a/net/ipv6/netfilter/Makefile +++ b/net/ipv6/netfilter/Makefile @@ -27,6 +27,5 @@ obj-$(CONFIG_IP6_NF_MATCH_OPTS) += ip6t_hbh.o obj-$(CONFIG_IP6_NF_MATCH_RT) += ip6t_rt.o # targets -obj-$(CONFIG_IP6_NF_TARGET_HL) += ip6t_HL.o obj-$(CONFIG_IP6_NF_TARGET_LOG) += ip6t_LOG.o obj-$(CONFIG_IP6_NF_TARGET_REJECT) += ip6t_REJECT.o diff --git a/net/ipv6/netfilter/ip6t_HL.c b/net/ipv6/netfilter/ip6t_HL.c deleted file mode 100644 index 27b5adf..0000000 --- a/net/ipv6/netfilter/ip6t_HL.c +++ /dev/null @@ -1,95 +0,0 @@ -/* - * Hop Limit modification target for ip6tables - * Maciej Soltysiak - * Based on HW's TTL module - * - * This software is distributed under the terms of GNU GPL - */ - -#include -#include -#include -#include - -#include -#include - -MODULE_AUTHOR("Maciej Soltysiak "); -MODULE_DESCRIPTION("Xtables: IPv6 Hop Limit field modification target"); -MODULE_LICENSE("GPL"); - -static unsigned int -hl_tg6(struct sk_buff *skb, const struct xt_target_param *par) -{ - struct ipv6hdr *ip6h; - const struct ip6t_HL_info *info = par->targinfo; - int new_hl; - - if (!skb_make_writable(skb, skb->len)) - return NF_DROP; - - ip6h = ipv6_hdr(skb); - - switch (info->mode) { - case IP6T_HL_SET: - new_hl = info->hop_limit; - break; - case IP6T_HL_INC: - new_hl = ip6h->hop_limit + info->hop_limit; - if (new_hl > 255) - new_hl = 255; - break; - case IP6T_HL_DEC: - new_hl = ip6h->hop_limit - info->hop_limit; - if (new_hl < 0) - new_hl = 0; - break; - default: - new_hl = ip6h->hop_limit; - break; - } - - ip6h->hop_limit = new_hl; - - return XT_CONTINUE; -} - -static bool hl_tg6_check(const struct xt_tgchk_param *par) -{ - const struct ip6t_HL_info *info = par->targinfo; - - if (info->mode > IP6T_HL_MAXMODE) { - printk(KERN_WARNING "ip6t_HL: invalid or unknown Mode %u\n", - info->mode); - return false; - } - if (info->mode != IP6T_HL_SET && info->hop_limit == 0) { - printk(KERN_WARNING "ip6t_HL: increment/decrement doesn't " - "make sense with value 0\n"); - return false; - } - return true; -} - -static struct xt_target hl_tg6_reg __read_mostly = { - .name = "HL", - .family = NFPROTO_IPV6, - .target = hl_tg6, - .targetsize = sizeof(struct ip6t_HL_info), - .table = "mangle", - .checkentry = hl_tg6_check, - .me = THIS_MODULE -}; - -static int __init hl_tg6_init(void) -{ - return xt_register_target(&hl_tg6_reg); -} - -static void __exit hl_tg6_exit(void) -{ - xt_unregister_target(&hl_tg6_reg); -} - -module_init(hl_tg6_init); -module_exit(hl_tg6_exit); -- cgit v1.1