Release 4.8 net/ipv4/netfilter/nf_defrag_ipv4.c
/* (C) 1999-2001 Paul `Rusty' Russell
* (C) 2002-2004 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/types.h>
#include <linux/ip.h>
#include <linux/netfilter.h>
#include <linux/module.h>
#include <linux/skbuff.h>
#include <net/route.h>
#include <net/ip.h>
#include <linux/netfilter_bridge.h>
#include <linux/netfilter_ipv4.h>
#include <net/netfilter/ipv4/nf_defrag_ipv4.h>
#if IS_ENABLED(CONFIG_NF_CONNTRACK)
#include <net/netfilter/nf_conntrack.h>
#endif
#include <net/netfilter/nf_conntrack_zones.h>
static int nf_ct_ipv4_gather_frags(struct net *net, struct sk_buff *skb,
u_int32_t user)
{
int err;
local_bh_disable();
err = ip_defrag(net, skb, user);
local_bh_enable();
if (!err)
skb->ignore_df = 1;
return err;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| kovacs krisztian | kovacs krisztian | 40 | 75.47% | 1 | 25.00% |
| eric w. biederman | eric w. biederman | 7 | 13.21% | 1 | 25.00% |
| florian westphal | florian westphal | 5 | 9.43% | 1 | 25.00% |
| americo wang | americo wang | 1 | 1.89% | 1 | 25.00% |
| Total | 53 | 100.00% | 4 | 100.00% |
static enum ip_defrag_users nf_ct_defrag_user(unsigned int hooknum,
struct sk_buff *skb)
{
u16 zone_id = NF_CT_DEFAULT_ZONE_ID;
#if IS_ENABLED(CONFIG_NF_CONNTRACK)
if (skb->nfct) {
enum ip_conntrack_info ctinfo;
const struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
zone_id = nf_ct_zone_id(nf_ct_zone(ct), CTINFO2DIR(ctinfo));
}
#endif
if (nf_bridge_in_prerouting(skb))
return IP_DEFRAG_CONNTRACK_BRIDGE_IN + zone_id;
if (hooknum == NF_INET_PRE_ROUTING)
return IP_DEFRAG_CONNTRACK_IN + zone_id;
else
return IP_DEFRAG_CONNTRACK_OUT + zone_id;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| patrick mchardy | patrick mchardy | 60 | 60.61% | 3 | 42.86% |
| daniel borkmann | daniel borkmann | 35 | 35.35% | 2 | 28.57% |
| florian westphal | florian westphal | 3 | 3.03% | 1 | 14.29% |
| duan jiong | duan jiong | 1 | 1.01% | 1 | 14.29% |
| Total | 99 | 100.00% | 7 | 100.00% |
static unsigned int ipv4_conntrack_defrag(void *priv,
struct sk_buff *skb,
const struct nf_hook_state *state)
{
struct sock *sk = skb->sk;
if (sk && sk_fullsock(sk) && (sk->sk_family == PF_INET) &&
inet_sk(sk)->nodefrag)
return NF_ACCEPT;
#if IS_ENABLED(CONFIG_NF_CONNTRACK)
#if !IS_ENABLED(CONFIG_NF_NAT)
/* Previously seen (loopback)? Ignore. Do this before
fragment check. */
if (skb->nfct && !nf_ct_is_template((struct nf_conn *)skb->nfct))
return NF_ACCEPT;
#endif
#endif
/* Gather fragments. */
if (ip_is_fragment(ip_hdr(skb))) {
enum ip_defrag_users user =
nf_ct_defrag_user(state->hook, skb);
if (nf_ct_ipv4_gather_frags(state->net, skb, user))
return NF_STOLEN;
}
return NF_ACCEPT;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| kovacs krisztian | kovacs krisztian | 59 | 41.26% | 1 | 7.14% |
| patrick mchardy | patrick mchardy | 34 | 23.78% | 4 | 28.57% |
| jiri olsa | jiri olsa | 27 | 18.88% | 2 | 14.29% |
| eric dumazet | eric dumazet | 9 | 6.29% | 1 | 7.14% |
| eric w. biederman | eric w. biederman | 8 | 5.59% | 3 | 21.43% |
| david s. miller | david s. miller | 2 | 1.40% | 1 | 7.14% |
| duan jiong | duan jiong | 2 | 1.40% | 1 | 7.14% |
| paul gortmaker | paul gortmaker | 2 | 1.40% | 1 | 7.14% |
| Total | 143 | 100.00% | 14 | 100.00% |
static struct nf_hook_ops ipv4_defrag_ops[] = {
{
.hook = ipv4_conntrack_defrag,
.pf = NFPROTO_IPV4,
.hooknum = NF_INET_PRE_ROUTING,
.priority = NF_IP_PRI_CONNTRACK_DEFRAG,
},
{
.hook = ipv4_conntrack_defrag,
.pf = NFPROTO_IPV4,
.hooknum = NF_INET_LOCAL_OUT,
.priority = NF_IP_PRI_CONNTRACK_DEFRAG,
},
};
static int __init nf_defrag_init(void)
{
return nf_register_hooks(ipv4_defrag_ops, ARRAY_SIZE(ipv4_defrag_ops));
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| kovacs krisztian | kovacs krisztian | 20 | 100.00% | 1 | 100.00% |
| Total | 20 | 100.00% | 1 | 100.00% |
static void __exit nf_defrag_fini(void)
{
nf_unregister_hooks(ipv4_defrag_ops, ARRAY_SIZE(ipv4_defrag_ops));
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| kovacs krisztian | kovacs krisztian | 19 | 100.00% | 1 | 100.00% |
| Total | 19 | 100.00% | 1 | 100.00% |
void nf_defrag_ipv4_enable(void)
{
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| kovacs krisztian | kovacs krisztian | 6 | 100.00% | 1 | 100.00% |
| Total | 6 | 100.00% | 1 | 100.00% |
EXPORT_SYMBOL_GPL(nf_defrag_ipv4_enable);
module_init(nf_defrag_init);
module_exit(nf_defrag_fini);
MODULE_LICENSE("GPL");
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| kovacs krisztian | kovacs krisztian | 241 | 52.74% | 1 | 4.35% |
| patrick mchardy | patrick mchardy | 109 | 23.85% | 6 | 26.09% |
| daniel borkmann | daniel borkmann | 35 | 7.66% | 2 | 8.70% |
| jiri olsa | jiri olsa | 27 | 5.91% | 2 | 8.70% |
| eric w. biederman | eric w. biederman | 15 | 3.28% | 3 | 13.04% |
| florian westphal | florian westphal | 10 | 2.19% | 3 | 13.04% |
| eric dumazet | eric dumazet | 9 | 1.97% | 1 | 4.35% |
| duan jiong | duan jiong | 4 | 0.88% | 1 | 4.35% |
| david s. miller | david s. miller | 2 | 0.44% | 1 | 4.35% |
| paul gortmaker | paul gortmaker | 2 | 0.44% | 1 | 4.35% |
| alban crequy | alban crequy | 2 | 0.44% | 1 | 4.35% |
| americo wang | americo wang | 1 | 0.22% | 1 | 4.35% |
| Total | 457 | 100.00% | 23 | 100.00% |
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