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![Patrick McHardy](/assets/img/avatar_default.png)
Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
87 lines
2.2 KiB
C
87 lines
2.2 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/x_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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{
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const struct ipt_tos_target_info *tosinfo = targinfo;
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struct iphdr *iph = ip_hdr(*pskb);
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if ((iph->tos & IPTOS_TOS_MASK) != tosinfo->tos) {
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__u8 oldtos;
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if (!skb_make_writable(pskb, sizeof(struct iphdr)))
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return NF_DROP;
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iph = ip_hdr(*pskb);
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oldtos = iph->tos;
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iph->tos = (iph->tos & IPTOS_PREC_MASK) | tosinfo->tos;
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nf_csum_replace2(&iph->check, htons(oldtos), htons(iph->tos));
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}
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return XT_CONTINUE;
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}
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static bool
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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 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 false;
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}
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return true;
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}
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static struct xt_target ipt_tos_reg __read_mostly = {
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.name = "TOS",
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.family = AF_INET,
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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 xt_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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xt_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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