/* iptables module for the IPv4 and TCP ECN bits, Version 1.5
*
* (C) 2002 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
+ * it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* ipt_ECN.c,v 1.5 2002/08/18 19:36:51 laforge Exp
*/
+#include <linux/in.h>
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/ip.h>
+#include <net/ip.h>
#include <linux/tcp.h>
#include <net/checksum.h>
+#include <linux/netfilter/x_tables.h>
#include <linux/netfilter_ipv4/ip_tables.h>
#include <linux/netfilter_ipv4/ipt_ECN.h>
static inline int
set_ect_ip(struct sk_buff **pskb, const struct ipt_ECN_info *einfo)
{
- if (((*pskb)->nh.iph->tos & IPT_ECN_IP_MASK)
- != (einfo->ip_ect & IPT_ECN_IP_MASK)) {
- u_int16_t diffs[2];
+ struct iphdr *iph = ip_hdr(*pskb);
+ if ((iph->tos & IPT_ECN_IP_MASK) != (einfo->ip_ect & IPT_ECN_IP_MASK)) {
+ __u8 oldtos;
if (!skb_make_writable(pskb, sizeof(struct iphdr)))
return 0;
-
- diffs[0] = htons((*pskb)->nh.iph->tos) ^ 0xFFFF;
- (*pskb)->nh.iph->tos &= ~IPT_ECN_IP_MASK;
- (*pskb)->nh.iph->tos |= (einfo->ip_ect & IPT_ECN_IP_MASK);
- diffs[1] = htons((*pskb)->nh.iph->tos);
- (*pskb)->nh.iph->check
- = csum_fold(csum_partial((char *)diffs,
- sizeof(diffs),
- (*pskb)->nh.iph->check
- ^0xFFFF));
- }
+ iph = ip_hdr(*pskb);
+ oldtos = iph->tos;
+ iph->tos &= ~IPT_ECN_IP_MASK;
+ iph->tos |= (einfo->ip_ect & IPT_ECN_IP_MASK);
+ nf_csum_replace2(&iph->check, htons(oldtos), htons(iph->tos));
+ }
return 1;
}
/* Return 0 if there was an error. */
static inline int
-set_ect_tcp(struct sk_buff **pskb, const struct ipt_ECN_info *einfo, int inward)
+set_ect_tcp(struct sk_buff **pskb, const struct ipt_ECN_info *einfo)
{
struct tcphdr _tcph, *tcph;
- u_int16_t diffs[2];
+ __be16 oldval;
/* Not enought header? */
- tcph = skb_header_pointer(*pskb, (*pskb)->nh.iph->ihl*4,
+ tcph = skb_header_pointer(*pskb, ip_hdrlen(*pskb),
sizeof(_tcph), &_tcph);
if (!tcph)
return 0;
tcph->cwr == einfo->proto.tcp.cwr)))
return 1;
- if (!skb_make_writable(pskb, (*pskb)->nh.iph->ihl*4+sizeof(*tcph)))
- return 0;
- tcph = (void *)(*pskb)->nh.iph + (*pskb)->nh.iph->ihl*4;
-
- if ((*pskb)->ip_summed == CHECKSUM_HW &&
- skb_checksum_help(*pskb, inward))
+ if (!skb_make_writable(pskb, ip_hdrlen(*pskb) + sizeof(*tcph)))
return 0;
+ tcph = (void *)ip_hdr(*pskb) + ip_hdrlen(*pskb);
- diffs[0] = ((u_int16_t *)tcph)[6];
+ oldval = ((__be16 *)tcph)[6];
if (einfo->operation & IPT_ECN_OP_SET_ECE)
tcph->ece = einfo->proto.tcp.ece;
if (einfo->operation & IPT_ECN_OP_SET_CWR)
tcph->cwr = einfo->proto.tcp.cwr;
- diffs[1] = ((u_int16_t *)tcph)[6];
- diffs[0] = diffs[0] ^ 0xFFFF;
- if ((*pskb)->ip_summed != CHECKSUM_UNNECESSARY)
- tcph->check = csum_fold(csum_partial((char *)diffs,
- sizeof(diffs),
- tcph->check^0xFFFF));
+ nf_proto_csum_replace2(&tcph->check, *pskb,
+ oldval, ((__be16 *)tcph)[6], 0);
return 1;
}
const struct net_device *out,
unsigned int hooknum,
const struct xt_target *target,
- const void *targinfo,
- void *userinfo)
+ const void *targinfo)
{
const struct ipt_ECN_info *einfo = targinfo;
return NF_DROP;
if (einfo->operation & (IPT_ECN_OP_SET_ECE | IPT_ECN_OP_SET_CWR)
- && (*pskb)->nh.iph->protocol == IPPROTO_TCP)
- if (!set_ect_tcp(pskb, einfo, (out == NULL)))
+ && ip_hdr(*pskb)->protocol == IPPROTO_TCP)
+ if (!set_ect_tcp(pskb, einfo))
return NF_DROP;
- return IPT_CONTINUE;
+ return XT_CONTINUE;
}
static int
checkentry(const char *tablename,
const void *e_void,
const struct xt_target *target,
- void *targinfo,
- unsigned int targinfosize,
- unsigned int hook_mask)
+ void *targinfo,
+ unsigned int hook_mask)
{
const struct ipt_ECN_info *einfo = (struct ipt_ECN_info *)targinfo;
const struct ipt_entry *e = e_void;
return 0;
}
if ((einfo->operation & (IPT_ECN_OP_SET_ECE|IPT_ECN_OP_SET_CWR))
- && (e->ip.proto != IPPROTO_TCP || (e->ip.invflags & IPT_INV_PROTO))) {
+ && (e->ip.proto != IPPROTO_TCP || (e->ip.invflags & XT_INV_PROTO))) {
printk(KERN_WARNING "ECN: cannot use TCP operations on a "
"non-tcp rule\n");
return 0;
return 1;
}
-static struct ipt_target ipt_ecn_reg = {
+static struct xt_target ipt_ecn_reg = {
.name = "ECN",
+ .family = AF_INET,
.target = target,
.targetsize = sizeof(struct ipt_ECN_info),
.table = "mangle",
.me = THIS_MODULE,
};
-static int __init init(void)
+static int __init ipt_ecn_init(void)
{
- return ipt_register_target(&ipt_ecn_reg);
+ return xt_register_target(&ipt_ecn_reg);
}
-static void __exit fini(void)
+static void __exit ipt_ecn_fini(void)
{
- ipt_unregister_target(&ipt_ecn_reg);
+ xt_unregister_target(&ipt_ecn_reg);
}
-module_init(init);
-module_exit(fini);
+module_init(ipt_ecn_init);
+module_exit(ipt_ecn_fini);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff