Release 4.8 net/ipv4/netfilter/iptable_mangle.c
/*
* This is the 1999 rewrite of IP Firewalling, aiming for kernel 2.3.x.
*
* Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling
* Copyright (C) 2000-2004 Netfilter Core Team <coreteam@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.
*/
#include <linux/module.h>
#include <linux/netfilter_ipv4/ip_tables.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <linux/slab.h>
#include <net/sock.h>
#include <net/route.h>
#include <linux/ip.h>
#include <net/ip.h>
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
MODULE_DESCRIPTION("iptables mangle table");
#define MANGLE_VALID_HOOKS ((1 << NF_INET_PRE_ROUTING) | \
(1 << NF_INET_LOCAL_IN) | \
(1 << NF_INET_FORWARD) | \
(1 << NF_INET_LOCAL_OUT) | \
(1 << NF_INET_POST_ROUTING))
static int __net_init iptable_mangle_table_init(struct net *net);
static const struct xt_table packet_mangler = {
.name = "mangle",
.valid_hooks = MANGLE_VALID_HOOKS,
.me = THIS_MODULE,
.af = NFPROTO_IPV4,
.priority = NF_IP_PRI_MANGLE,
.table_init = iptable_mangle_table_init,
};
static unsigned int
ipt_mangle_out(struct sk_buff *skb, const struct nf_hook_state *state)
{
unsigned int ret;
const struct iphdr *iph;
u_int8_t tos;
__be32 saddr, daddr;
u_int32_t mark;
int err;
/* root is playing with raw sockets. */
if (skb->len < sizeof(struct iphdr) ||
ip_hdrlen(skb) < sizeof(struct iphdr))
return NF_ACCEPT;
/* Save things which could affect route */
mark = skb->mark;
iph = ip_hdr(skb);
saddr = iph->saddr;
daddr = iph->daddr;
tos = iph->tos;
ret = ipt_do_table(skb, state, state->net->ipv4.iptable_mangle);
/* Reroute for ANY change. */
if (ret != NF_DROP && ret != NF_STOLEN) {
iph = ip_hdr(skb);
if (iph->saddr != saddr ||
iph->daddr != daddr ||
skb->mark != mark ||
iph->tos != tos) {
err = ip_route_me_harder(state->net, skb, RTN_UNSPEC);
if (err < 0)
ret = NF_DROP_ERR(err);
}
}
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
pre-git | pre-git | 114 | 58.46% | 2 | 12.50% |
arnaldo carvalho de melo | arnaldo carvalho de melo | 27 | 13.85% | 2 | 12.50% |
patrick mchardy | patrick mchardy | 17 | 8.72% | 1 | 6.25% |
herbert xu | herbert xu | 9 | 4.62% | 1 | 6.25% |
eric w. biederman | eric w. biederman | 7 | 3.59% | 2 | 12.50% |
thomas graf | thomas graf | 6 | 3.08% | 1 | 6.25% |
simon horman | simon horman | 5 | 2.56% | 1 | 6.25% |
alexey dobriyan | alexey dobriyan | 4 | 2.05% | 2 | 12.50% |
david s. miller | david s. miller | 4 | 2.05% | 2 | 12.50% |
al viro | al viro | 1 | 0.51% | 1 | 6.25% |
jan engelhardt | jan engelhardt | 1 | 0.51% | 1 | 6.25% |
| Total | 195 | 100.00% | 16 | 100.00% |
/* The work comes in here from netfilter.c. */
static unsigned int
iptable_mangle_hook(void *priv,
struct sk_buff *skb,
const struct nf_hook_state *state)
{
if (state->hook == NF_INET_LOCAL_OUT)
return ipt_mangle_out(skb, state);
return ipt_do_table(skb, state, state->net->ipv4.iptable_mangle);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
jan engelhardt | jan engelhardt | 41 | 75.93% | 2 | 28.57% |
david s. miller | david s. miller | 6 | 11.11% | 1 | 14.29% |
eric w. biederman | eric w. biederman | 5 | 9.26% | 3 | 42.86% |
patrick mchardy | patrick mchardy | 2 | 3.70% | 1 | 14.29% |
| Total | 54 | 100.00% | 7 | 100.00% |
static struct nf_hook_ops *mangle_ops __read_mostly;
static int __net_init iptable_mangle_table_init(struct net *net)
{
struct ipt_replace *repl;
int ret;
if (net->ipv4.iptable_mangle)
return 0;
repl = ipt_alloc_initial_table(&packet_mangler);
if (repl == NULL)
return -ENOMEM;
ret = ipt_register_table(net, &packet_mangler, repl, mangle_ops,
&net->ipv4.iptable_mangle);
kfree(repl);
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
jan engelhardt | jan engelhardt | 28 | 35.90% | 1 | 14.29% |
florian westphal | florian westphal | 26 | 33.33% | 2 | 28.57% |
pre-git | pre-git | 11 | 14.10% | 1 | 14.29% |
alexey dobriyan | alexey dobriyan | 11 | 14.10% | 2 | 28.57% |
harald welte | harald welte | 2 | 2.56% | 1 | 14.29% |
| Total | 78 | 100.00% | 7 | 100.00% |
static void __net_exit iptable_mangle_net_exit(struct net *net)
{
if (!net->ipv4.iptable_mangle)
return;
ipt_unregister_table(net, net->ipv4.iptable_mangle, mangle_ops);
net->ipv4.iptable_mangle = NULL;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
alexey dobriyan | alexey dobriyan | 23 | 53.49% | 2 | 50.00% |
florian westphal | florian westphal | 20 | 46.51% | 2 | 50.00% |
| Total | 43 | 100.00% | 4 | 100.00% |
static struct pernet_operations iptable_mangle_net_ops = {
.exit = iptable_mangle_net_exit,
};
static int __init iptable_mangle_init(void)
{
int ret;
mangle_ops = xt_hook_ops_alloc(&packet_mangler, iptable_mangle_hook);
if (IS_ERR(mangle_ops)) {
ret = PTR_ERR(mangle_ops);
return ret;
}
ret = register_pernet_subsys(&iptable_mangle_net_ops);
if (ret < 0) {
kfree(mangle_ops);
return ret;
}
ret = iptable_mangle_table_init(&init_net);
if (ret) {
unregister_pernet_subsys(&iptable_mangle_net_ops);
kfree(mangle_ops);
}
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
florian westphal | florian westphal | 45 | 48.39% | 1 | 14.29% |
alexey dobriyan | alexey dobriyan | 24 | 25.81% | 2 | 28.57% |
pre-git | pre-git | 10 | 10.75% | 1 | 14.29% |
jan engelhardt | jan engelhardt | 9 | 9.68% | 1 | 14.29% |
linus torvalds | linus torvalds | 4 | 4.30% | 1 | 14.29% |
jean sacren | jean sacren | 1 | 1.08% | 1 | 14.29% |
| Total | 93 | 100.00% | 7 | 100.00% |
static void __exit iptable_mangle_fini(void)
{
unregister_pernet_subsys(&iptable_mangle_net_ops);
kfree(mangle_ops);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
pre-git | pre-git | 14 | 70.00% | 1 | 25.00% |
florian westphal | florian westphal | 4 | 20.00% | 1 | 25.00% |
jan engelhardt | jan engelhardt | 1 | 5.00% | 1 | 25.00% |
andrew morton | andrew morton | 1 | 5.00% | 1 | 25.00% |
| Total | 20 | 100.00% | 4 | 100.00% |
module_init(iptable_mangle_init);
module_exit(iptable_mangle_fini);
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
pre-git | pre-git | 194 | 31.86% | 2 | 4.88% |
florian westphal | florian westphal | 111 | 18.23% | 2 | 4.88% |
jan engelhardt | jan engelhardt | 91 | 14.94% | 7 | 17.07% |
alexey dobriyan | alexey dobriyan | 75 | 12.32% | 4 | 9.76% |
arnaldo carvalho de melo | arnaldo carvalho de melo | 30 | 4.93% | 2 | 4.88% |
patrick mchardy | patrick mchardy | 22 | 3.61% | 5 | 12.20% |
harald welte | harald welte | 21 | 3.45% | 3 | 7.32% |
eric w. biederman | eric w. biederman | 12 | 1.97% | 4 | 9.76% |
david s. miller | david s. miller | 10 | 1.64% | 3 | 7.32% |
art haas | art haas | 10 | 1.64% | 1 | 2.44% |
herbert xu | herbert xu | 9 | 1.48% | 1 | 2.44% |
thomas graf | thomas graf | 6 | 0.99% | 1 | 2.44% |
simon horman | simon horman | 5 | 0.82% | 1 | 2.44% |
linus torvalds | linus torvalds | 5 | 0.82% | 1 | 2.44% |
tejun heo | tejun heo | 3 | 0.49% | 1 | 2.44% |
andrew morton | andrew morton | 3 | 0.49% | 1 | 2.44% |
jean sacren | jean sacren | 1 | 0.16% | 1 | 2.44% |
al viro | al viro | 1 | 0.16% | 1 | 2.44% |
| Total | 609 | 100.00% | 41 | 100.00% |
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.