diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /net/ipv4/netfilter/ipt_ttl.c |
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'net/ipv4/netfilter/ipt_ttl.c')
-rw-r--r-- | net/ipv4/netfilter/ipt_ttl.c | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/net/ipv4/netfilter/ipt_ttl.c b/net/ipv4/netfilter/ipt_ttl.c new file mode 100644 index 00000000000..219aa9de88c --- /dev/null +++ b/net/ipv4/netfilter/ipt_ttl.c @@ -0,0 +1,79 @@ +/* IP tables module for matching the value of the TTL + * + * ipt_ttl.c,v 1.5 2000/11/13 11:16:08 laforge Exp + * + * (C) 2000,2001 by Harald Welte <laforge@netfilter.org> + * + * 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/module.h> +#include <linux/skbuff.h> + +#include <linux/netfilter_ipv4/ipt_ttl.h> +#include <linux/netfilter_ipv4/ip_tables.h> + +MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); +MODULE_DESCRIPTION("IP tables TTL matching module"); +MODULE_LICENSE("GPL"); + +static int match(const struct sk_buff *skb, const struct net_device *in, + const struct net_device *out, const void *matchinfo, + int offset, int *hotdrop) +{ + const struct ipt_ttl_info *info = matchinfo; + + switch (info->mode) { + case IPT_TTL_EQ: + return (skb->nh.iph->ttl == info->ttl); + break; + case IPT_TTL_NE: + return (!(skb->nh.iph->ttl == info->ttl)); + break; + case IPT_TTL_LT: + return (skb->nh.iph->ttl < info->ttl); + break; + case IPT_TTL_GT: + return (skb->nh.iph->ttl > info->ttl); + break; + default: + printk(KERN_WARNING "ipt_ttl: unknown mode %d\n", + info->mode); + return 0; + } + + return 0; +} + +static int checkentry(const char *tablename, const struct ipt_ip *ip, + void *matchinfo, unsigned int matchsize, + unsigned int hook_mask) +{ + if (matchsize != IPT_ALIGN(sizeof(struct ipt_ttl_info))) + return 0; + + return 1; +} + +static struct ipt_match ttl_match = { + .name = "ttl", + .match = &match, + .checkentry = &checkentry, + .me = THIS_MODULE, +}; + +static int __init init(void) +{ + return ipt_register_match(&ttl_match); +} + +static void __exit fini(void) +{ + ipt_unregister_match(&ttl_match); + +} + +module_init(init); +module_exit(fini); |