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![Andrew Morton](/assets/img/avatar_default.png)
Every netfilter module uses `init' for its module_init() function and `fini' or `cleanup' for its module_exit() function. Problem is, this creates uninformative initcall_debug output and makes ctags rather useless. So go through and rename them all to $(filename)_init and $(filename)_fini. Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: David S. Miller <davem@davemloft.net>
95 lines
2.4 KiB
C
95 lines
2.4 KiB
C
/* This is a module which is used for setting the TOS field of a packet. */
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/* (C) 1999-2001 Paul `Rusty' Russell
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* (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
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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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* published by the Free Software Foundation.
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*/
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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 <net/checksum.h>
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#include <linux/netfilter_ipv4/ip_tables.h>
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#include <linux/netfilter_ipv4/ipt_TOS.h>
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
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MODULE_DESCRIPTION("iptables TOS mangling module");
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static unsigned int
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target(struct sk_buff **pskb,
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const struct net_device *in,
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const struct net_device *out,
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unsigned int hooknum,
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const struct xt_target *target,
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const void *targinfo,
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void *userinfo)
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{
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const struct ipt_tos_target_info *tosinfo = targinfo;
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if (((*pskb)->nh.iph->tos & IPTOS_TOS_MASK) != tosinfo->tos) {
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u_int16_t diffs[2];
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if (!skb_make_writable(pskb, sizeof(struct iphdr)))
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return NF_DROP;
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diffs[0] = htons((*pskb)->nh.iph->tos) ^ 0xFFFF;
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(*pskb)->nh.iph->tos
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= ((*pskb)->nh.iph->tos & IPTOS_PREC_MASK)
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diffs[1] = htons((*pskb)->nh.iph->tos);
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(*pskb)->nh.iph->check
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= csum_fold(csum_partial((char *)diffs,
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sizeof(diffs),
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(*pskb)->nh.iph->check
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^0xFFFF));
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}
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return IPT_CONTINUE;
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}
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static int
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checkentry(const char *tablename,
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const void *e_void,
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const struct xt_target *target,
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void *targinfo,
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unsigned int targinfosize,
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unsigned int hook_mask)
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{
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const u_int8_t tos = ((struct ipt_tos_target_info *)targinfo)->tos;
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if (tos != IPTOS_LOWDELAY
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&& tos != IPTOS_THROUGHPUT
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&& tos != IPTOS_RELIABILITY
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&& tos != IPTOS_MINCOST
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&& tos != IPTOS_NORMALSVC) {
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printk(KERN_WARNING "TOS: bad tos value %#x\n", tos);
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return 0;
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}
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return 1;
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}
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static struct ipt_target ipt_tos_reg = {
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.name = "TOS",
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.target = target,
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.targetsize = sizeof(struct ipt_tos_target_info),
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.table = "mangle",
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.checkentry = checkentry,
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.me = THIS_MODULE,
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};
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static int __init ipt_tos_init(void)
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{
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return ipt_register_target(&ipt_tos_reg);
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}
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static void __exit ipt_tos_fini(void)
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{
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ipt_unregister_target(&ipt_tos_reg);
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}
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module_init(ipt_tos_init);
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module_exit(ipt_tos_fini);
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