Release 4.7 net/ipv4/netfilter/ipt_ECN.c
/* 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
* published by the Free Software Foundation.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#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>
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
MODULE_DESCRIPTION("Xtables: Explicit Congestion Notification (ECN) flag modification");
/* set ECT codepoint from IP header.
* return false if there was an error. */
static inline bool
set_ect_ip(struct sk_buff *skb, const struct ipt_ECN_info *einfo)
{
struct iphdr *iph = ip_hdr(skb);
if ((iph->tos & IPT_ECN_IP_MASK) != (einfo->ip_ect & IPT_ECN_IP_MASK)) {
__u8 oldtos;
if (!skb_make_writable(skb, sizeof(struct iphdr)))
return false;
iph = ip_hdr(skb);
oldtos = iph->tos;
iph->tos &= ~IPT_ECN_IP_MASK;
iph->tos |= (einfo->ip_ect & IPT_ECN_IP_MASK);
csum_replace2(&iph->check, htons(oldtos), htons(iph->tos));
}
return true;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| harald welte | harald welte | 71 | 57.72% | 2 | 20.00% |
| patrick mchardy | patrick mchardy | 25 | 20.33% | 3 | 30.00% |
| rusty russell | rusty russell | 8 | 6.50% | 1 | 10.00% |
| al viro | al viro | 6 | 4.88% | 1 | 10.00% |
| arnaldo carvalho de melo | arnaldo carvalho de melo | 6 | 4.88% | 1 | 10.00% |
| herbert xu | herbert xu | 4 | 3.25% | 1 | 10.00% |
| jan engelhardt | jan engelhardt | 3 | 2.44% | 1 | 10.00% |
| Total | 123 | 100.00% | 10 | 100.00% |
/* Return false if there was an error. */
static inline bool
set_ect_tcp(struct sk_buff *skb, const struct ipt_ECN_info *einfo)
{
struct tcphdr _tcph, *tcph;
__be16 oldval;
/* Not enough header? */
tcph = skb_header_pointer(skb, ip_hdrlen(skb), sizeof(_tcph), &_tcph);
if (!tcph)
return false;
if ((!(einfo->operation & IPT_ECN_OP_SET_ECE) ||
tcph->ece == einfo->proto.tcp.ece) &&
(!(einfo->operation & IPT_ECN_OP_SET_CWR) ||
tcph->cwr == einfo->proto.tcp.cwr))
return true;
if (!skb_make_writable(skb, ip_hdrlen(skb) + sizeof(*tcph)))
return false;
tcph = (void *)ip_hdr(skb) + ip_hdrlen(skb);
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;
inet_proto_csum_replace2(&tcph->check, skb,
oldval, ((__be16 *)tcph)[6], false);
return true;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| rusty russell | rusty russell | 88 | 38.77% | 2 | 11.76% |
| harald welte | harald welte | 72 | 31.72% | 2 | 11.76% |
| patrick mchardy | patrick mchardy | 16 | 7.05% | 3 | 17.65% |
| david s. miller | david s. miller | 15 | 6.61% | 1 | 5.88% |
| arnaldo carvalho de melo | arnaldo carvalho de melo | 12 | 5.29% | 2 | 11.76% |
| herbert xu | herbert xu | 8 | 3.52% | 1 | 5.88% |
| al viro | al viro | 6 | 2.64% | 2 | 11.76% |
| jan engelhardt | jan engelhardt | 5 | 2.20% | 1 | 5.88% |
| james morris | james morris | 3 | 1.32% | 1 | 5.88% |
| andre goddard rosa | andre goddard rosa | 1 | 0.44% | 1 | 5.88% |
| tom herbert | tom herbert | 1 | 0.44% | 1 | 5.88% |
| Total | 227 | 100.00% | 17 | 100.00% |
static unsigned int
ecn_tg(struct sk_buff *skb, const struct xt_action_param *par)
{
const struct ipt_ECN_info *einfo = par->targinfo;
if (einfo->operation & IPT_ECN_OP_SET_IP)
if (!set_ect_ip(skb, einfo))
return NF_DROP;
if (einfo->operation & (IPT_ECN_OP_SET_ECE | IPT_ECN_OP_SET_CWR) &&
ip_hdr(skb)->protocol == IPPROTO_TCP)
if (!set_ect_tcp(skb, einfo))
return NF_DROP;
return XT_CONTINUE;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| harald welte | harald welte | 59 | 68.60% | 1 | 12.50% |
| rusty russell | rusty russell | 14 | 16.28% | 1 | 12.50% |
| jan engelhardt | jan engelhardt | 6 | 6.98% | 4 | 50.00% |
| herbert xu | herbert xu | 4 | 4.65% | 1 | 12.50% |
| arnaldo carvalho de melo | arnaldo carvalho de melo | 3 | 3.49% | 1 | 12.50% |
| Total | 86 | 100.00% | 8 | 100.00% |
static int ecn_tg_check(const struct xt_tgchk_param *par)
{
const struct ipt_ECN_info *einfo = par->targinfo;
const struct ipt_entry *e = par->entryinfo;
if (einfo->operation & IPT_ECN_OP_MASK) {
pr_info("unsupported ECN operation %x\n", einfo->operation);
return -EINVAL;
}
if (einfo->ip_ect & ~IPT_ECN_IP_MASK) {
pr_info("new ECT codepoint %x out of mask\n", einfo->ip_ect);
return -EINVAL;
}
if ((einfo->operation & (IPT_ECN_OP_SET_ECE|IPT_ECN_OP_SET_CWR)) &&
(e->ip.proto != IPPROTO_TCP || (e->ip.invflags & XT_INV_PROTO))) {
pr_info("cannot use TCP operations on a non-tcp rule\n");
return -EINVAL;
}
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| harald welte | harald welte | 91 | 71.65% | 2 | 20.00% |
| jan engelhardt | jan engelhardt | 23 | 18.11% | 6 | 60.00% |
| rusty russell | rusty russell | 11 | 8.66% | 1 | 10.00% |
| patrick mchardy | patrick mchardy | 2 | 1.57% | 1 | 10.00% |
| Total | 127 | 100.00% | 10 | 100.00% |
static struct xt_target ecn_tg_reg __read_mostly = {
.name = "ECN",
.family = NFPROTO_IPV4,
.target = ecn_tg,
.targetsize = sizeof(struct ipt_ECN_info),
.table = "mangle",
.checkentry = ecn_tg_check,
.me = THIS_MODULE,
};
static int __init ecn_tg_init(void)
{
return xt_register_target(&ecn_tg_reg);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| harald welte | harald welte | 12 | 75.00% | 1 | 25.00% |
| jan engelhardt | jan engelhardt | 3 | 18.75% | 2 | 50.00% |
| daniele bellucci | daniele bellucci | 1 | 6.25% | 1 | 25.00% |
| Total | 16 | 100.00% | 4 | 100.00% |
static void __exit ecn_tg_exit(void)
{
xt_unregister_target(&ecn_tg_reg);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| harald welte | harald welte | 12 | 80.00% | 1 | 33.33% |
| jan engelhardt | jan engelhardt | 3 | 20.00% | 2 | 66.67% |
| Total | 15 | 100.00% | 3 | 100.00% |
module_init(ecn_tg_init);
module_exit(ecn_tg_exit);
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| harald welte | harald welte | 370 | 52.41% | 4 | 10.53% |
| rusty russell | rusty russell | 121 | 17.14% | 3 | 7.89% |
| jan engelhardt | jan engelhardt | 70 | 9.92% | 11 | 28.95% |
| patrick mchardy | patrick mchardy | 59 | 8.36% | 9 | 23.68% |
| arnaldo carvalho de melo | arnaldo carvalho de melo | 24 | 3.40% | 2 | 5.26% |
| herbert xu | herbert xu | 16 | 2.27% | 1 | 2.63% |
| david s. miller | david s. miller | 15 | 2.12% | 1 | 2.63% |
| art haas | art haas | 13 | 1.84% | 1 | 2.63% |
| al viro | al viro | 12 | 1.70% | 2 | 5.26% |
| james morris | james morris | 3 | 0.42% | 1 | 2.63% |
| andre goddard rosa | andre goddard rosa | 1 | 0.14% | 1 | 2.63% |
| daniele bellucci | daniele bellucci | 1 | 0.14% | 1 | 2.63% |
| tom herbert | tom herbert | 1 | 0.14% | 1 | 2.63% |
| Total | 706 | 100.00% | 38 | 100.00% |
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