Release 4.11 net/netfilter/nf_queue.c
/*
* Rusty Russell (C)2000 -- This code is GPL.
* Patrick McHardy (c) 2006-2012
*/
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/proc_fs.h>
#include <linux/skbuff.h>
#include <linux/netfilter.h>
#include <linux/netfilter_bridge.h>
#include <linux/seq_file.h>
#include <linux/rcupdate.h>
#include <net/protocol.h>
#include <net/netfilter/nf_queue.h>
#include <net/dst.h>
#include "nf_internals.h"
/*
* Hook for nfnetlink_queue to register its queue handler.
* We do this so that most of the NFQUEUE code can be modular.
*
* Once the queue is registered it must reinject all packets it
* receives, no matter what.
*/
/* return EBUSY when somebody else is registered, return EEXIST if the
* same handler is registered, return 0 in case of success. */
void nf_register_queue_handler(struct net *net, const struct nf_queue_handler *qh)
{
/* should never happen, we only have one queueing backend in kernel */
WARN_ON(rcu_access_pointer(net->nf.queue_handler));
rcu_assign_pointer(net->nf.queue_handler, qh);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Harald Welte | 14 | 35.00% | 2 | 25.00% |
| Eric W. Biedermann | 13 | 32.50% | 1 | 12.50% |
| Eric Dumazet | 5 | 12.50% | 2 | 25.00% |
| Florian Westphal | 4 | 10.00% | 1 | 12.50% |
| Yasuyuki Kozakai | 3 | 7.50% | 1 | 12.50% |
| Patrick McHardy | 1 | 2.50% | 1 | 12.50% |
| Total | 40 | 100.00% | 8 | 100.00% |
EXPORT_SYMBOL(nf_register_queue_handler);
/* The caller must flush their queue before this */
void nf_unregister_queue_handler(struct net *net)
{
RCU_INIT_POINTER(net->nf.queue_handler, NULL);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Eric W. Biedermann | 8 | 38.10% | 1 | 20.00% |
| Harald Welte | 8 | 38.10% | 1 | 20.00% |
| Yasuyuki Kozakai | 3 | 14.29% | 1 | 20.00% |
| Florian Westphal | 1 | 4.76% | 1 | 20.00% |
| Stephen Hemminger | 1 | 4.76% | 1 | 20.00% |
| Total | 21 | 100.00% | 5 | 100.00% |
EXPORT_SYMBOL(nf_unregister_queue_handler);
void nf_queue_entry_release_refs(struct nf_queue_entry *entry)
{
struct nf_hook_state *state = &entry->state;
/* Release those devices we held, or Alexey will kill me. */
if (state->in)
dev_put(state->in);
if (state->out)
dev_put(state->out);
if (state->sk)
sock_put(state->sk);
#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
if (entry->skb->nf_bridge) {
struct net_device *physdev;
physdev = nf_bridge_get_physindev(entry->skb);
if (physdev)
dev_put(physdev);
physdev = nf_bridge_get_physoutdev(entry->skb);
if (physdev)
dev_put(physdev);
}
#endif
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Patrick McHardy | 64 | 53.78% | 1 | 20.00% |
| David S. Miller | 29 | 24.37% | 2 | 40.00% |
| Florian Westphal | 21 | 17.65% | 1 | 20.00% |
| Pablo Neira Ayuso | 5 | 4.20% | 1 | 20.00% |
| Total | 119 | 100.00% | 5 | 100.00% |
EXPORT_SYMBOL_GPL(nf_queue_entry_release_refs);
/* Bump dev refs so they don't vanish while packet is out */
void nf_queue_entry_get_refs(struct nf_queue_entry *entry)
{
struct nf_hook_state *state = &entry->state;
if (state->in)
dev_hold(state->in);
if (state->out)
dev_hold(state->out);
if (state->sk)
sock_hold(state->sk);
#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
if (entry->skb->nf_bridge) {
struct net_device *physdev;
physdev = nf_bridge_get_physindev(entry->skb);
if (physdev)
dev_hold(physdev);
physdev = nf_bridge_get_physoutdev(entry->skb);
if (physdev)
dev_hold(physdev);
}
#endif
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Florian Westphal | 84 | 71.19% | 3 | 50.00% |
| David S. Miller | 29 | 24.58% | 2 | 33.33% |
| Pablo Neira Ayuso | 5 | 4.24% | 1 | 16.67% |
| Total | 118 | 100.00% | 6 | 100.00% |
EXPORT_SYMBOL_GPL(nf_queue_entry_get_refs);
void nf_queue_nf_hook_drop(struct net *net, const struct nf_hook_entry *entry)
{
const struct nf_queue_handler *qh;
rcu_read_lock();
qh = rcu_dereference(net->nf.queue_handler);
if (qh)
qh->nf_hook_drop(net, entry);
rcu_read_unlock();
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Eric W. Biedermann | 43 | 82.69% | 2 | 50.00% |
| Pablo Neira Ayuso | 5 | 9.62% | 1 | 25.00% |
| Aaron Conole | 4 | 7.69% | 1 | 25.00% |
| Total | 52 | 100.00% | 4 | 100.00% |
static int __nf_queue(struct sk_buff *skb, const struct nf_hook_state *state,
struct nf_hook_entry *hook_entry, unsigned int queuenum)
{
int status = -ENOENT;
struct nf_queue_entry *entry = NULL;
const struct nf_afinfo *afinfo;
const struct nf_queue_handler *qh;
struct net *net = state->net;
/* QUEUE == DROP if no one is waiting, to be safe. */
qh = rcu_dereference(net->nf.queue_handler);
if (!qh) {
status = -ESRCH;
goto err;
}
afinfo = nf_get_afinfo(state->pf);
if (!afinfo)
goto err;
entry = kmalloc(sizeof(*entry) + afinfo->route_key_size, GFP_ATOMIC);
if (!entry) {
status = -ENOMEM;
goto err;
}
*entry = (struct nf_queue_entry) {
.skb = skb,
.state = *state,
.hook = hook_entry,
.size = sizeof(*entry) + afinfo->route_key_size,
};
nf_queue_entry_get_refs(entry);
skb_dst_force(skb);
afinfo->saveroute(skb, entry);
status = qh->outfn(entry, queuenum);
if (status < 0) {
nf_queue_entry_release_refs(entry);
goto err;
}
return 0;
err:
kfree(entry);
return status;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Harald Welte | 84 | 36.05% | 2 | 8.70% |
| Patrick McHardy | 62 | 26.61% | 7 | 30.43% |
| Florian Westphal | 37 | 15.88% | 6 | 26.09% |
| Pablo Neira Ayuso | 13 | 5.58% | 2 | 8.70% |
| Eric W. Biedermann | 13 | 5.58% | 1 | 4.35% |
| Yasuyuki Kozakai | 11 | 4.72% | 1 | 4.35% |
| David S. Miller | 7 | 3.00% | 2 | 8.70% |
| Eric Dumazet | 5 | 2.15% | 1 | 4.35% |
| Lucas De Marchi | 1 | 0.43% | 1 | 4.35% |
| Total | 233 | 100.00% | 23 | 100.00% |
/* Packets leaving via this function must come back through nf_reinject(). */
int nf_queue(struct sk_buff *skb, struct nf_hook_state *state,
struct nf_hook_entry **entryp, unsigned int verdict)
{
struct nf_hook_entry *entry = *entryp;
int ret;
ret = __nf_queue(skb, state, entry, verdict >> NF_VERDICT_QBITS);
if (ret < 0) {
if (ret == -ESRCH &&
(verdict & NF_VERDICT_FLAG_QUEUE_BYPASS)) {
*entryp = rcu_dereference(entry->next);
return 1;
}
kfree_skb(skb);
}
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Pablo Neira Ayuso | 95 | 100.00% | 2 | 100.00% |
| Total | 95 | 100.00% | 2 | 100.00% |
static unsigned int nf_iterate(struct sk_buff *skb,
struct nf_hook_state *state,
struct nf_hook_entry **entryp)
{
unsigned int verdict;
do {
repeat:
verdict = nf_hook_entry_hookfn((*entryp), skb, state);
if (verdict != NF_ACCEPT) {
if (verdict != NF_REPEAT)
return verdict;
goto repeat;
}
*entryp = rcu_dereference((*entryp)->next);
} while (*entryp);
return NF_ACCEPT;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Pablo Neira Ayuso | 87 | 98.86% | 1 | 50.00% |
| Aaron Conole | 1 | 1.14% | 1 | 50.00% |
| Total | 88 | 100.00% | 2 | 100.00% |
void nf_reinject(struct nf_queue_entry *entry, unsigned int verdict)
{
struct nf_hook_entry *hook_entry = entry->hook;
struct sk_buff *skb = entry->skb;
const struct nf_afinfo *afinfo;
int err;
nf_queue_entry_release_refs(entry);
/* Continue traversal iff userspace said ok... */
if (verdict == NF_REPEAT)
verdict = nf_hook_entry_hookfn(hook_entry, skb, &entry->state);
if (verdict == NF_ACCEPT) {
afinfo = nf_get_afinfo(entry->state.pf);
if (!afinfo || afinfo->reroute(entry->state.net, skb, entry) < 0)
verdict = NF_DROP;
}
if (verdict == NF_ACCEPT) {
hook_entry = rcu_dereference(hook_entry->next);
if (hook_entry)
next_hook:
verdict = nf_iterate(skb, &entry->state, &hook_entry);
}
switch (verdict & NF_VERDICT_MASK) {
case NF_ACCEPT:
case NF_STOP:
okfn:
local_bh_disable();
entry->state.okfn(entry->state.net, entry->state.sk, skb);
local_bh_enable();
break;
case NF_QUEUE:
err = nf_queue(skb, &entry->state, &hook_entry, verdict);
if (err == 1) {
if (hook_entry)
goto next_hook;
goto okfn;
}
break;
case NF_STOLEN:
break;
default:
kfree_skb(skb);
}
kfree(entry);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Harald Welte | 88 | 35.48% | 1 | 4.00% |
| Patrick McHardy | 63 | 25.40% | 7 | 28.00% |
| Pablo Neira Ayuso | 30 | 12.10% | 2 | 8.00% |
| Florian Westphal | 25 | 10.08% | 5 | 20.00% |
| David S. Miller | 14 | 5.65% | 3 | 12.00% |
| Eric W. Biedermann | 12 | 4.84% | 2 | 8.00% |
| Aaron Conole | 8 | 3.23% | 2 | 8.00% |
| Michael Wang | 4 | 1.61% | 1 | 4.00% |
| Eric Dumazet | 3 | 1.21% | 1 | 4.00% |
| Julian Anastasov | 1 | 0.40% | 1 | 4.00% |
| Total | 248 | 100.00% | 25 | 100.00% |
EXPORT_SYMBOL(nf_reinject);
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Pablo Neira Ayuso | 241 | 22.17% | 5 | 10.20% |
| Harald Welte | 238 | 21.90% | 3 | 6.12% |
| Patrick McHardy | 197 | 18.12% | 11 | 22.45% |
| Florian Westphal | 187 | 17.20% | 10 | 20.41% |
| Eric W. Biedermann | 89 | 8.19% | 4 | 8.16% |
| David S. Miller | 79 | 7.27% | 4 | 8.16% |
| Yasuyuki Kozakai | 17 | 1.56% | 1 | 2.04% |
| Eric Dumazet | 16 | 1.47% | 4 | 8.16% |
| Aaron Conole | 13 | 1.20% | 2 | 4.08% |
| Michael Wang | 4 | 0.37% | 1 | 2.04% |
| Tejun Heo | 3 | 0.28% | 1 | 2.04% |
| Julian Anastasov | 1 | 0.09% | 1 | 2.04% |
| Lucas De Marchi | 1 | 0.09% | 1 | 2.04% |
| Stephen Hemminger | 1 | 0.09% | 1 | 2.04% |
| Total | 1087 | 100.00% | 49 | 100.00% |
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