Release 4.8 net/ipv6/netfilter/ip6table_mangle.c
/*
* IPv6 packet mangling table, a port of the IPv4 mangle table to IPv6
*
* Copyright (C) 2000-2001 by Harald Welte <laforge@gnumonks.org>
* 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_ipv6/ip6_tables.h>
#include <linux/slab.h>
#include <net/ipv6.h>
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
MODULE_DESCRIPTION("ip6tables 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 ip6table_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_IPV6,
.priority = NF_IP6_PRI_MANGLE,
.table_init = ip6table_mangle_table_init,
};
static unsigned int
ip6t_mangle_out(struct sk_buff *skb, const struct nf_hook_state *state)
{
unsigned int ret;
struct in6_addr saddr, daddr;
u_int8_t hop_limit;
u_int32_t flowlabel, mark;
int err;
#if 0
/* root is playing with raw sockets. */
if (skb->len < sizeof(struct iphdr) ||
ip_hdrlen(skb) < sizeof(struct iphdr)) {
net_warn_ratelimited("ip6t_hook: happy cracking\n");
return NF_ACCEPT;
}
#endif
/* save source/dest address, mark, hoplimit, flowlabel, priority, */
memcpy(&saddr, &ipv6_hdr(skb)->saddr, sizeof(saddr));
memcpy(&daddr, &ipv6_hdr(skb)->daddr, sizeof(daddr));
mark = skb->mark;
hop_limit = ipv6_hdr(skb)->hop_limit;
/* flowlabel and prio (includes version, which shouldn't change either */
flowlabel = *((u_int32_t *)ipv6_hdr(skb));
ret = ip6t_do_table(skb, state, state->net->ipv6.ip6table_mangle);
if (ret != NF_DROP && ret != NF_STOLEN &&
(!ipv6_addr_equal(&ipv6_hdr(skb)->saddr, &saddr) ||
!ipv6_addr_equal(&ipv6_hdr(skb)->daddr, &daddr) ||
skb->mark != mark ||
ipv6_hdr(skb)->hop_limit != hop_limit ||
flowlabel != *((u_int32_t *)ipv6_hdr(skb)))) {
err = ip6_route_me_harder(state->net, skb);
if (err < 0)
ret = NF_DROP_ERR(err);
}
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| linus torvalds | linus torvalds | 130 | 56.03% | 1 | 6.25% |
| david s. miller | david s. miller | 25 | 10.78% | 3 | 18.75% |
| patrick mchardy | patrick mchardy | 22 | 9.48% | 2 | 12.50% |
| arnaldo carvalho de melo | arnaldo carvalho de melo | 21 | 9.05% | 1 | 6.25% |
| herbert xu | herbert xu | 12 | 5.17% | 1 | 6.25% |
| thomas graf | thomas graf | 7 | 3.02% | 1 | 6.25% |
| eric w. biederman | eric w. biederman | 5 | 2.16% | 2 | 12.50% |
| alexey dobriyan | alexey dobriyan | 4 | 1.72% | 2 | 12.50% |
| hideaki yoshifuji | hideaki yoshifuji | 4 | 1.72% | 1 | 6.25% |
| joe perches | joe perches | 1 | 0.43% | 1 | 6.25% |
| jan engelhardt | jan engelhardt | 1 | 0.43% | 1 | 6.25% |
| Total | 232 | 100.00% | 16 | 100.00% |
/* The work comes in here from netfilter.c. */
static unsigned int
ip6table_mangle_hook(void *priv, struct sk_buff *skb,
const struct nf_hook_state *state)
{
if (state->hook == NF_INET_LOCAL_OUT)
return ip6t_mangle_out(skb, state);
return ip6t_do_table(skb, state, state->net->ipv6.ip6table_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 ip6table_mangle_table_init(struct net *net)
{
struct ip6t_replace *repl;
int ret;
if (net->ipv6.ip6table_mangle)
return 0;
repl = ip6t_alloc_initial_table(&packet_mangler);
if (repl == NULL)
return -ENOMEM;
ret = ip6t_register_table(net, &packet_mangler, repl, mangle_ops,
&net->ipv6.ip6table_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% |
| alexey dobriyan | alexey dobriyan | 11 | 14.10% | 2 | 28.57% |
| linus torvalds | linus torvalds | 11 | 14.10% | 1 | 14.29% |
| harald welte | harald welte | 2 | 2.56% | 1 | 14.29% |
| Total | 78 | 100.00% | 7 | 100.00% |
static void __net_exit ip6table_mangle_net_exit(struct net *net)
{
if (!net->ipv6.ip6table_mangle)
return;
ip6t_unregister_table(net, net->ipv6.ip6table_mangle, mangle_ops);
net->ipv6.ip6table_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 ip6table_mangle_net_ops = {
.exit = ip6table_mangle_net_exit,
};
static int __init ip6table_mangle_init(void)
{
int ret;
mangle_ops = xt_hook_ops_alloc(&packet_mangler, ip6table_mangle_hook);
if (IS_ERR(mangle_ops))
return PTR_ERR(mangle_ops);
ret = register_pernet_subsys(&ip6table_mangle_net_ops);
if (ret < 0) {
kfree(mangle_ops);
return ret;
}
ret = ip6table_mangle_table_init(&init_net);
if (ret) {
unregister_pernet_subsys(&ip6table_mangle_net_ops);
kfree(mangle_ops);
}
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| florian westphal | florian westphal | 40 | 45.98% | 1 | 16.67% |
| alexey dobriyan | alexey dobriyan | 23 | 26.44% | 2 | 33.33% |
| linus torvalds | linus torvalds | 17 | 19.54% | 2 | 33.33% |
| jan engelhardt | jan engelhardt | 7 | 8.05% | 1 | 16.67% |
| Total | 87 | 100.00% | 6 | 100.00% |
static void __exit ip6table_mangle_fini(void)
{
unregister_pernet_subsys(&ip6table_mangle_net_ops);
kfree(mangle_ops);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| linus torvalds | linus torvalds | 14 | 70.00% | 1 | 25.00% |
| florian westphal | florian westphal | 4 | 20.00% | 1 | 25.00% |
| andrew morton | andrew morton | 1 | 5.00% | 1 | 25.00% |
| jan engelhardt | jan engelhardt | 1 | 5.00% | 1 | 25.00% |
| Total | 20 | 100.00% | 4 | 100.00% |
module_init(ip6table_mangle_init);
module_exit(ip6table_mangle_fini);
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| linus torvalds | linus torvalds | 203 | 32.48% | 2 | 4.88% |
| florian westphal | florian westphal | 106 | 16.96% | 2 | 4.88% |
| jan engelhardt | jan engelhardt | 89 | 14.24% | 7 | 17.07% |
| alexey dobriyan | alexey dobriyan | 74 | 11.84% | 5 | 12.20% |
| david s. miller | david s. miller | 31 | 4.96% | 4 | 9.76% |
| patrick mchardy | patrick mchardy | 27 | 4.32% | 6 | 14.63% |
| arnaldo carvalho de melo | arnaldo carvalho de melo | 21 | 3.36% | 1 | 2.44% |
| harald welte | harald welte | 21 | 3.36% | 3 | 7.32% |
| herbert xu | herbert xu | 12 | 1.92% | 1 | 2.44% |
| eric w. biederman | eric w. biederman | 10 | 1.60% | 4 | 9.76% |
| art haas | art haas | 10 | 1.60% | 1 | 2.44% |
| hideaki yoshifuji | hideaki yoshifuji | 7 | 1.12% | 1 | 2.44% |
| thomas graf | thomas graf | 7 | 1.12% | 1 | 2.44% |
| andrew morton | andrew morton | 3 | 0.48% | 1 | 2.44% |
| tejun heo | tejun heo | 3 | 0.48% | 1 | 2.44% |
| joe perches | joe perches | 1 | 0.16% | 1 | 2.44% |
| Total | 625 | 100.00% | 41 | 100.00% |
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