2006-08-22 07:30:26 +00:00
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/* x_tables module for setting the IPv4/IPv6 DSCP field, Version 1.8
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*
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* (C) 2002 by Harald Welte <laforge@netfilter.org>
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* based on ipt_FTOS.c (C) 2000 by Matthew G. Marsh <mgm@paktronix.com>
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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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* See RFC2474 for a description of the DSCP field within the IP Header.
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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 <linux/ipv6.h>
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#include <net/dsfield.h>
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#include <linux/netfilter/x_tables.h>
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#include <linux/netfilter/xt_DSCP.h>
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2007-12-05 07:38:13 +00:00
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#include <linux/netfilter_ipv4/ipt_TOS.h>
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2006-08-22 07:30:26 +00:00
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MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
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MODULE_DESCRIPTION("x_tables DSCP modification module");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("ipt_DSCP");
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MODULE_ALIAS("ip6t_DSCP");
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2007-12-05 07:38:13 +00:00
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MODULE_ALIAS("ipt_TOS");
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2007-12-05 07:39:09 +00:00
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MODULE_ALIAS("ip6t_TOS");
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2006-08-22 07:30:26 +00:00
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2007-12-05 07:24:03 +00:00
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static unsigned int
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dscp_tg(struct sk_buff *skb, const struct net_device *in,
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const struct net_device *out, unsigned int hooknum,
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const struct xt_target *target, const void *targinfo)
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2006-08-22 07:30:26 +00:00
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{
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const struct xt_DSCP_info *dinfo = targinfo;
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2007-10-15 07:53:15 +00:00
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u_int8_t dscp = ipv4_get_dsfield(ip_hdr(skb)) >> XT_DSCP_SHIFT;
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2006-08-22 07:30:26 +00:00
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if (dscp != dinfo->dscp) {
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2007-10-15 07:53:15 +00:00
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if (!skb_make_writable(skb, sizeof(struct iphdr)))
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2006-08-22 07:30:26 +00:00
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return NF_DROP;
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2007-10-15 07:53:15 +00:00
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ipv4_change_dsfield(ip_hdr(skb), (__u8)(~XT_DSCP_MASK),
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2006-08-22 07:30:26 +00:00
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dinfo->dscp << XT_DSCP_SHIFT);
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}
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return XT_CONTINUE;
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}
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2007-12-05 07:24:03 +00:00
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static unsigned int
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dscp_tg6(struct sk_buff *skb, const struct net_device *in,
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const struct net_device *out, unsigned int hooknum,
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const struct xt_target *target, const void *targinfo)
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2006-08-22 07:30:26 +00:00
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{
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const struct xt_DSCP_info *dinfo = targinfo;
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2007-10-15 07:53:15 +00:00
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u_int8_t dscp = ipv6_get_dsfield(ipv6_hdr(skb)) >> XT_DSCP_SHIFT;
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2006-08-22 07:30:26 +00:00
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if (dscp != dinfo->dscp) {
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2007-10-15 07:53:15 +00:00
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if (!skb_make_writable(skb, sizeof(struct ipv6hdr)))
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2006-08-22 07:30:26 +00:00
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return NF_DROP;
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2007-10-15 07:53:15 +00:00
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ipv6_change_dsfield(ipv6_hdr(skb), (__u8)(~XT_DSCP_MASK),
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2006-08-22 07:30:26 +00:00
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dinfo->dscp << XT_DSCP_SHIFT);
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}
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return XT_CONTINUE;
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}
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2007-12-05 07:24:03 +00:00
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static bool
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dscp_tg_check(const char *tablename, const void *e_void,
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const struct xt_target *target, void *targinfo,
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unsigned int hook_mask)
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2006-08-22 07:30:26 +00:00
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{
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const u_int8_t dscp = ((struct xt_DSCP_info *)targinfo)->dscp;
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2007-07-08 05:19:08 +00:00
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if (dscp > XT_DSCP_MAX) {
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2006-08-22 07:30:26 +00:00
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printk(KERN_WARNING "DSCP: dscp %x out of range\n", dscp);
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2007-07-08 05:16:26 +00:00
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return false;
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2006-08-22 07:30:26 +00:00
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}
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2007-07-08 05:16:26 +00:00
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return true;
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2006-08-22 07:30:26 +00:00
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}
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2007-12-05 07:38:13 +00:00
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static unsigned int
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tos_tg_v0(struct sk_buff *skb, const struct net_device *in,
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const struct net_device *out, unsigned int hooknum,
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const struct xt_target *target, const void *targinfo)
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{
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const struct ipt_tos_target_info *info = targinfo;
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struct iphdr *iph = ip_hdr(skb);
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u_int8_t oldtos;
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if ((iph->tos & IPTOS_TOS_MASK) != info->tos) {
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if (!skb_make_writable(skb, sizeof(struct iphdr)))
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return NF_DROP;
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iph = ip_hdr(skb);
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oldtos = iph->tos;
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iph->tos = (iph->tos & IPTOS_PREC_MASK) | info->tos;
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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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tos_tg_check_v0(const char *tablename, const void *e_void,
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const struct xt_target *target, 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 && tos != IPTOS_THROUGHPUT &&
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tos != IPTOS_RELIABILITY && 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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2007-12-05 07:39:09 +00:00
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static unsigned int
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tos_tg(struct sk_buff *skb, const struct net_device *in,
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const struct net_device *out, unsigned int hooknum,
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const struct xt_target *target, const void *targinfo)
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{
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const struct xt_tos_target_info *info = targinfo;
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struct iphdr *iph = ip_hdr(skb);
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u_int8_t orig, nv;
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orig = ipv4_get_dsfield(iph);
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2008-01-15 07:32:37 +00:00
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nv = (orig & ~info->tos_mask) ^ info->tos_value;
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2007-12-05 07:39:09 +00:00
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if (orig != nv) {
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if (!skb_make_writable(skb, sizeof(struct iphdr)))
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return NF_DROP;
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iph = ip_hdr(skb);
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2008-01-15 07:32:54 +00:00
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ipv4_change_dsfield(iph, 0, nv);
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2007-12-05 07:39:09 +00:00
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}
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return XT_CONTINUE;
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}
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static unsigned int
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tos_tg6(struct sk_buff *skb, const struct net_device *in,
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const struct net_device *out, unsigned int hooknum,
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const struct xt_target *target, const void *targinfo)
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{
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const struct xt_tos_target_info *info = targinfo;
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struct ipv6hdr *iph = ipv6_hdr(skb);
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u_int8_t orig, nv;
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orig = ipv6_get_dsfield(iph);
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nv = (orig & info->tos_mask) ^ info->tos_value;
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if (orig != nv) {
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if (!skb_make_writable(skb, sizeof(struct iphdr)))
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return NF_DROP;
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iph = ipv6_hdr(skb);
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2008-01-15 07:32:54 +00:00
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ipv6_change_dsfield(iph, 0, nv);
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2007-12-05 07:39:09 +00:00
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}
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return XT_CONTINUE;
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}
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2007-12-05 07:24:03 +00:00
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static struct xt_target dscp_tg_reg[] __read_mostly = {
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2006-08-22 07:34:04 +00:00
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{
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.name = "DSCP",
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.family = AF_INET,
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2007-12-05 07:24:03 +00:00
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.checkentry = dscp_tg_check,
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.target = dscp_tg,
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2006-08-22 07:34:04 +00:00
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.targetsize = sizeof(struct xt_DSCP_info),
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.table = "mangle",
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.me = THIS_MODULE,
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},
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{
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.name = "DSCP",
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.family = AF_INET6,
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2007-12-05 07:24:03 +00:00
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.checkentry = dscp_tg_check,
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.target = dscp_tg6,
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2006-08-22 07:34:04 +00:00
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.targetsize = sizeof(struct xt_DSCP_info),
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.table = "mangle",
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.me = THIS_MODULE,
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},
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2007-12-05 07:38:13 +00:00
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{
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.name = "TOS",
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.revision = 0,
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.family = AF_INET,
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.table = "mangle",
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.target = tos_tg_v0,
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.targetsize = sizeof(struct ipt_tos_target_info),
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.checkentry = tos_tg_check_v0,
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.me = THIS_MODULE,
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},
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2007-12-05 07:39:09 +00:00
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{
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.name = "TOS",
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.revision = 1,
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.family = AF_INET,
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.table = "mangle",
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.target = tos_tg,
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.targetsize = sizeof(struct xt_tos_target_info),
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.me = THIS_MODULE,
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},
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{
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.name = "TOS",
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.revision = 1,
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.family = AF_INET6,
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.table = "mangle",
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.target = tos_tg6,
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.targetsize = sizeof(struct xt_tos_target_info),
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.me = THIS_MODULE,
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},
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2006-08-22 07:30:26 +00:00
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};
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2007-12-05 07:24:03 +00:00
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static int __init dscp_tg_init(void)
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2006-08-22 07:30:26 +00:00
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{
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2007-12-05 07:24:03 +00:00
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return xt_register_targets(dscp_tg_reg, ARRAY_SIZE(dscp_tg_reg));
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2006-08-22 07:30:26 +00:00
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}
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2007-12-05 07:24:03 +00:00
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static void __exit dscp_tg_exit(void)
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2006-08-22 07:30:26 +00:00
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{
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2007-12-05 07:24:03 +00:00
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xt_unregister_targets(dscp_tg_reg, ARRAY_SIZE(dscp_tg_reg));
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2006-08-22 07:30:26 +00:00
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}
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2007-12-05 07:24:03 +00:00
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module_init(dscp_tg_init);
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module_exit(dscp_tg_exit);
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