/* netfilter.c: look after the filters for various protocols.
|
* Heavily influenced by the old firewall.c by David Bonn and Alan Cox.
|
*
|
* Thanks to Rob `CmdrTaco' Malda for not influencing this code in any
|
* way.
|
*
|
* This code is GPL.
|
*/
|
#include <linux/kernel.h>
|
#include <linux/netfilter.h>
|
#include <net/protocol.h>
|
#include <linux/init.h>
|
#include <linux/skbuff.h>
|
#include <linux/wait.h>
|
#include <linux/module.h>
|
#include <linux/interrupt.h>
|
#include <linux/if.h>
|
#include <linux/netdevice.h>
|
#include <linux/netfilter_ipv6.h>
|
#include <linux/inetdevice.h>
|
#include <linux/proc_fs.h>
|
#include <linux/mutex.h>
|
#include <linux/mm.h>
|
#include <linux/rcupdate.h>
|
#include <net/net_namespace.h>
|
#include <net/netfilter/nf_queue.h>
|
#include <net/sock.h>
|
|
#include "nf_internals.h"
|
|
const struct nf_ipv6_ops __rcu *nf_ipv6_ops __read_mostly;
|
EXPORT_SYMBOL_GPL(nf_ipv6_ops);
|
|
DEFINE_PER_CPU(bool, nf_skb_duplicated);
|
EXPORT_SYMBOL_GPL(nf_skb_duplicated);
|
|
#ifdef CONFIG_JUMP_LABEL
|
struct static_key nf_hooks_needed[NFPROTO_NUMPROTO][NF_MAX_HOOKS];
|
EXPORT_SYMBOL(nf_hooks_needed);
|
#endif
|
|
static DEFINE_MUTEX(nf_hook_mutex);
|
|
/* max hooks per family/hooknum */
|
#define MAX_HOOK_COUNT 1024
|
|
#define nf_entry_dereference(e) \
|
rcu_dereference_protected(e, lockdep_is_held(&nf_hook_mutex))
|
|
static struct nf_hook_entries *allocate_hook_entries_size(u16 num)
|
{
|
struct nf_hook_entries *e;
|
size_t alloc = sizeof(*e) +
|
sizeof(struct nf_hook_entry) * num +
|
sizeof(struct nf_hook_ops *) * num +
|
sizeof(struct nf_hook_entries_rcu_head);
|
|
if (num == 0)
|
return NULL;
|
|
e = kvzalloc(alloc, GFP_KERNEL);
|
if (e)
|
e->num_hook_entries = num;
|
return e;
|
}
|
|
static void __nf_hook_entries_free(struct rcu_head *h)
|
{
|
struct nf_hook_entries_rcu_head *head;
|
|
head = container_of(h, struct nf_hook_entries_rcu_head, head);
|
kvfree(head->allocation);
|
}
|
|
static void nf_hook_entries_free(struct nf_hook_entries *e)
|
{
|
struct nf_hook_entries_rcu_head *head;
|
struct nf_hook_ops **ops;
|
unsigned int num;
|
|
if (!e)
|
return;
|
|
num = e->num_hook_entries;
|
ops = nf_hook_entries_get_hook_ops(e);
|
head = (void *)&ops[num];
|
head->allocation = e;
|
call_rcu(&head->head, __nf_hook_entries_free);
|
}
|
|
static unsigned int accept_all(void *priv,
|
struct sk_buff *skb,
|
const struct nf_hook_state *state)
|
{
|
return NF_ACCEPT; /* ACCEPT makes nf_hook_slow call next hook */
|
}
|
|
static const struct nf_hook_ops dummy_ops = {
|
.hook = accept_all,
|
.priority = INT_MIN,
|
};
|
|
static struct nf_hook_entries *
|
nf_hook_entries_grow(const struct nf_hook_entries *old,
|
const struct nf_hook_ops *reg)
|
{
|
unsigned int i, alloc_entries, nhooks, old_entries;
|
struct nf_hook_ops **orig_ops = NULL;
|
struct nf_hook_ops **new_ops;
|
struct nf_hook_entries *new;
|
bool inserted = false;
|
|
alloc_entries = 1;
|
old_entries = old ? old->num_hook_entries : 0;
|
|
if (old) {
|
orig_ops = nf_hook_entries_get_hook_ops(old);
|
|
for (i = 0; i < old_entries; i++) {
|
if (orig_ops[i] != &dummy_ops)
|
alloc_entries++;
|
}
|
}
|
|
if (alloc_entries > MAX_HOOK_COUNT)
|
return ERR_PTR(-E2BIG);
|
|
new = allocate_hook_entries_size(alloc_entries);
|
if (!new)
|
return ERR_PTR(-ENOMEM);
|
|
new_ops = nf_hook_entries_get_hook_ops(new);
|
|
i = 0;
|
nhooks = 0;
|
while (i < old_entries) {
|
if (orig_ops[i] == &dummy_ops) {
|
++i;
|
continue;
|
}
|
|
if (inserted || reg->priority > orig_ops[i]->priority) {
|
new_ops[nhooks] = (void *)orig_ops[i];
|
new->hooks[nhooks] = old->hooks[i];
|
i++;
|
} else {
|
new_ops[nhooks] = (void *)reg;
|
new->hooks[nhooks].hook = reg->hook;
|
new->hooks[nhooks].priv = reg->priv;
|
inserted = true;
|
}
|
nhooks++;
|
}
|
|
if (!inserted) {
|
new_ops[nhooks] = (void *)reg;
|
new->hooks[nhooks].hook = reg->hook;
|
new->hooks[nhooks].priv = reg->priv;
|
}
|
|
return new;
|
}
|
|
static void hooks_validate(const struct nf_hook_entries *hooks)
|
{
|
#ifdef CONFIG_DEBUG_MISC
|
struct nf_hook_ops **orig_ops;
|
int prio = INT_MIN;
|
size_t i = 0;
|
|
orig_ops = nf_hook_entries_get_hook_ops(hooks);
|
|
for (i = 0; i < hooks->num_hook_entries; i++) {
|
if (orig_ops[i] == &dummy_ops)
|
continue;
|
|
WARN_ON(orig_ops[i]->priority < prio);
|
|
if (orig_ops[i]->priority > prio)
|
prio = orig_ops[i]->priority;
|
}
|
#endif
|
}
|
|
int nf_hook_entries_insert_raw(struct nf_hook_entries __rcu **pp,
|
const struct nf_hook_ops *reg)
|
{
|
struct nf_hook_entries *new_hooks;
|
struct nf_hook_entries *p;
|
|
p = rcu_dereference_raw(*pp);
|
new_hooks = nf_hook_entries_grow(p, reg);
|
if (IS_ERR(new_hooks))
|
return PTR_ERR(new_hooks);
|
|
hooks_validate(new_hooks);
|
|
rcu_assign_pointer(*pp, new_hooks);
|
|
BUG_ON(p == new_hooks);
|
nf_hook_entries_free(p);
|
return 0;
|
}
|
EXPORT_SYMBOL_GPL(nf_hook_entries_insert_raw);
|
|
/*
|
* __nf_hook_entries_try_shrink - try to shrink hook array
|
*
|
* @old -- current hook blob at @pp
|
* @pp -- location of hook blob
|
*
|
* Hook unregistration must always succeed, so to-be-removed hooks
|
* are replaced by a dummy one that will just move to next hook.
|
*
|
* This counts the current dummy hooks, attempts to allocate new blob,
|
* copies the live hooks, then replaces and discards old one.
|
*
|
* return values:
|
*
|
* Returns address to free, or NULL.
|
*/
|
static void *__nf_hook_entries_try_shrink(struct nf_hook_entries *old,
|
struct nf_hook_entries __rcu **pp)
|
{
|
unsigned int i, j, skip = 0, hook_entries;
|
struct nf_hook_entries *new = NULL;
|
struct nf_hook_ops **orig_ops;
|
struct nf_hook_ops **new_ops;
|
|
if (WARN_ON_ONCE(!old))
|
return NULL;
|
|
orig_ops = nf_hook_entries_get_hook_ops(old);
|
for (i = 0; i < old->num_hook_entries; i++) {
|
if (orig_ops[i] == &dummy_ops)
|
skip++;
|
}
|
|
/* if skip == hook_entries all hooks have been removed */
|
hook_entries = old->num_hook_entries;
|
if (skip == hook_entries)
|
goto out_assign;
|
|
if (skip == 0)
|
return NULL;
|
|
hook_entries -= skip;
|
new = allocate_hook_entries_size(hook_entries);
|
if (!new)
|
return NULL;
|
|
new_ops = nf_hook_entries_get_hook_ops(new);
|
for (i = 0, j = 0; i < old->num_hook_entries; i++) {
|
if (orig_ops[i] == &dummy_ops)
|
continue;
|
new->hooks[j] = old->hooks[i];
|
new_ops[j] = (void *)orig_ops[i];
|
j++;
|
}
|
hooks_validate(new);
|
out_assign:
|
rcu_assign_pointer(*pp, new);
|
return old;
|
}
|
|
static struct nf_hook_entries __rcu **
|
nf_hook_entry_head(struct net *net, int pf, unsigned int hooknum,
|
struct net_device *dev)
|
{
|
switch (pf) {
|
case NFPROTO_NETDEV:
|
break;
|
#ifdef CONFIG_NETFILTER_FAMILY_ARP
|
case NFPROTO_ARP:
|
if (WARN_ON_ONCE(ARRAY_SIZE(net->nf.hooks_arp) <= hooknum))
|
return NULL;
|
return net->nf.hooks_arp + hooknum;
|
#endif
|
#ifdef CONFIG_NETFILTER_FAMILY_BRIDGE
|
case NFPROTO_BRIDGE:
|
if (WARN_ON_ONCE(ARRAY_SIZE(net->nf.hooks_bridge) <= hooknum))
|
return NULL;
|
return net->nf.hooks_bridge + hooknum;
|
#endif
|
#ifdef CONFIG_NETFILTER_INGRESS
|
case NFPROTO_INET:
|
if (WARN_ON_ONCE(hooknum != NF_INET_INGRESS))
|
return NULL;
|
if (!dev || dev_net(dev) != net) {
|
WARN_ON_ONCE(1);
|
return NULL;
|
}
|
return &dev->nf_hooks_ingress;
|
#endif
|
case NFPROTO_IPV4:
|
if (WARN_ON_ONCE(ARRAY_SIZE(net->nf.hooks_ipv4) <= hooknum))
|
return NULL;
|
return net->nf.hooks_ipv4 + hooknum;
|
case NFPROTO_IPV6:
|
if (WARN_ON_ONCE(ARRAY_SIZE(net->nf.hooks_ipv6) <= hooknum))
|
return NULL;
|
return net->nf.hooks_ipv6 + hooknum;
|
#if IS_ENABLED(CONFIG_DECNET)
|
case NFPROTO_DECNET:
|
if (WARN_ON_ONCE(ARRAY_SIZE(net->nf.hooks_decnet) <= hooknum))
|
return NULL;
|
return net->nf.hooks_decnet + hooknum;
|
#endif
|
default:
|
WARN_ON_ONCE(1);
|
return NULL;
|
}
|
|
#ifdef CONFIG_NETFILTER_INGRESS
|
if (hooknum == NF_NETDEV_INGRESS) {
|
if (dev && dev_net(dev) == net)
|
return &dev->nf_hooks_ingress;
|
}
|
#endif
|
WARN_ON_ONCE(1);
|
return NULL;
|
}
|
|
static int nf_ingress_check(struct net *net, const struct nf_hook_ops *reg,
|
int hooknum)
|
{
|
#ifndef CONFIG_NETFILTER_INGRESS
|
if (reg->hooknum == hooknum)
|
return -EOPNOTSUPP;
|
#endif
|
if (reg->hooknum != hooknum ||
|
!reg->dev || dev_net(reg->dev) != net)
|
return -EINVAL;
|
|
return 0;
|
}
|
|
static inline bool nf_ingress_hook(const struct nf_hook_ops *reg, int pf)
|
{
|
if ((pf == NFPROTO_NETDEV && reg->hooknum == NF_NETDEV_INGRESS) ||
|
(pf == NFPROTO_INET && reg->hooknum == NF_INET_INGRESS))
|
return true;
|
|
return false;
|
}
|
|
static void nf_static_key_inc(const struct nf_hook_ops *reg, int pf)
|
{
|
#ifdef CONFIG_JUMP_LABEL
|
int hooknum;
|
|
if (pf == NFPROTO_INET && reg->hooknum == NF_INET_INGRESS) {
|
pf = NFPROTO_NETDEV;
|
hooknum = NF_NETDEV_INGRESS;
|
} else {
|
hooknum = reg->hooknum;
|
}
|
static_key_slow_inc(&nf_hooks_needed[pf][hooknum]);
|
#endif
|
}
|
|
static void nf_static_key_dec(const struct nf_hook_ops *reg, int pf)
|
{
|
#ifdef CONFIG_JUMP_LABEL
|
int hooknum;
|
|
if (pf == NFPROTO_INET && reg->hooknum == NF_INET_INGRESS) {
|
pf = NFPROTO_NETDEV;
|
hooknum = NF_NETDEV_INGRESS;
|
} else {
|
hooknum = reg->hooknum;
|
}
|
static_key_slow_dec(&nf_hooks_needed[pf][hooknum]);
|
#endif
|
}
|
|
static int __nf_register_net_hook(struct net *net, int pf,
|
const struct nf_hook_ops *reg)
|
{
|
struct nf_hook_entries *p, *new_hooks;
|
struct nf_hook_entries __rcu **pp;
|
int err;
|
|
switch (pf) {
|
case NFPROTO_NETDEV:
|
err = nf_ingress_check(net, reg, NF_NETDEV_INGRESS);
|
if (err < 0)
|
return err;
|
break;
|
case NFPROTO_INET:
|
if (reg->hooknum != NF_INET_INGRESS)
|
break;
|
|
err = nf_ingress_check(net, reg, NF_INET_INGRESS);
|
if (err < 0)
|
return err;
|
break;
|
}
|
|
pp = nf_hook_entry_head(net, pf, reg->hooknum, reg->dev);
|
if (!pp)
|
return -EINVAL;
|
|
mutex_lock(&nf_hook_mutex);
|
|
p = nf_entry_dereference(*pp);
|
new_hooks = nf_hook_entries_grow(p, reg);
|
|
if (!IS_ERR(new_hooks)) {
|
hooks_validate(new_hooks);
|
rcu_assign_pointer(*pp, new_hooks);
|
}
|
|
mutex_unlock(&nf_hook_mutex);
|
if (IS_ERR(new_hooks))
|
return PTR_ERR(new_hooks);
|
|
#ifdef CONFIG_NETFILTER_INGRESS
|
if (nf_ingress_hook(reg, pf))
|
net_inc_ingress_queue();
|
#endif
|
nf_static_key_inc(reg, pf);
|
|
BUG_ON(p == new_hooks);
|
nf_hook_entries_free(p);
|
return 0;
|
}
|
|
/*
|
* nf_remove_net_hook - remove a hook from blob
|
*
|
* @oldp: current address of hook blob
|
* @unreg: hook to unregister
|
*
|
* This cannot fail, hook unregistration must always succeed.
|
* Therefore replace the to-be-removed hook with a dummy hook.
|
*/
|
static bool nf_remove_net_hook(struct nf_hook_entries *old,
|
const struct nf_hook_ops *unreg)
|
{
|
struct nf_hook_ops **orig_ops;
|
unsigned int i;
|
|
orig_ops = nf_hook_entries_get_hook_ops(old);
|
for (i = 0; i < old->num_hook_entries; i++) {
|
if (orig_ops[i] != unreg)
|
continue;
|
WRITE_ONCE(old->hooks[i].hook, accept_all);
|
WRITE_ONCE(orig_ops[i], (void *)&dummy_ops);
|
return true;
|
}
|
|
return false;
|
}
|
|
static void __nf_unregister_net_hook(struct net *net, int pf,
|
const struct nf_hook_ops *reg)
|
{
|
struct nf_hook_entries __rcu **pp;
|
struct nf_hook_entries *p;
|
|
pp = nf_hook_entry_head(net, pf, reg->hooknum, reg->dev);
|
if (!pp)
|
return;
|
|
mutex_lock(&nf_hook_mutex);
|
|
p = nf_entry_dereference(*pp);
|
if (WARN_ON_ONCE(!p)) {
|
mutex_unlock(&nf_hook_mutex);
|
return;
|
}
|
|
if (nf_remove_net_hook(p, reg)) {
|
#ifdef CONFIG_NETFILTER_INGRESS
|
if (nf_ingress_hook(reg, pf))
|
net_dec_ingress_queue();
|
#endif
|
nf_static_key_dec(reg, pf);
|
} else {
|
WARN_ONCE(1, "hook not found, pf %d num %d", pf, reg->hooknum);
|
}
|
|
p = __nf_hook_entries_try_shrink(p, pp);
|
mutex_unlock(&nf_hook_mutex);
|
if (!p)
|
return;
|
|
nf_queue_nf_hook_drop(net);
|
nf_hook_entries_free(p);
|
}
|
|
void nf_unregister_net_hook(struct net *net, const struct nf_hook_ops *reg)
|
{
|
if (reg->pf == NFPROTO_INET) {
|
if (reg->hooknum == NF_INET_INGRESS) {
|
__nf_unregister_net_hook(net, NFPROTO_INET, reg);
|
} else {
|
__nf_unregister_net_hook(net, NFPROTO_IPV4, reg);
|
__nf_unregister_net_hook(net, NFPROTO_IPV6, reg);
|
}
|
} else {
|
__nf_unregister_net_hook(net, reg->pf, reg);
|
}
|
}
|
EXPORT_SYMBOL(nf_unregister_net_hook);
|
|
void nf_hook_entries_delete_raw(struct nf_hook_entries __rcu **pp,
|
const struct nf_hook_ops *reg)
|
{
|
struct nf_hook_entries *p;
|
|
p = rcu_dereference_raw(*pp);
|
if (nf_remove_net_hook(p, reg)) {
|
p = __nf_hook_entries_try_shrink(p, pp);
|
nf_hook_entries_free(p);
|
}
|
}
|
EXPORT_SYMBOL_GPL(nf_hook_entries_delete_raw);
|
|
int nf_register_net_hook(struct net *net, const struct nf_hook_ops *reg)
|
{
|
int err;
|
|
if (reg->pf == NFPROTO_INET) {
|
if (reg->hooknum == NF_INET_INGRESS) {
|
err = __nf_register_net_hook(net, NFPROTO_INET, reg);
|
if (err < 0)
|
return err;
|
} else {
|
err = __nf_register_net_hook(net, NFPROTO_IPV4, reg);
|
if (err < 0)
|
return err;
|
|
err = __nf_register_net_hook(net, NFPROTO_IPV6, reg);
|
if (err < 0) {
|
__nf_unregister_net_hook(net, NFPROTO_IPV4, reg);
|
return err;
|
}
|
}
|
} else {
|
err = __nf_register_net_hook(net, reg->pf, reg);
|
if (err < 0)
|
return err;
|
}
|
|
return 0;
|
}
|
EXPORT_SYMBOL(nf_register_net_hook);
|
|
int nf_register_net_hooks(struct net *net, const struct nf_hook_ops *reg,
|
unsigned int n)
|
{
|
unsigned int i;
|
int err = 0;
|
|
for (i = 0; i < n; i++) {
|
err = nf_register_net_hook(net, ®[i]);
|
if (err)
|
goto err;
|
}
|
return err;
|
|
err:
|
if (i > 0)
|
nf_unregister_net_hooks(net, reg, i);
|
return err;
|
}
|
EXPORT_SYMBOL(nf_register_net_hooks);
|
|
void nf_unregister_net_hooks(struct net *net, const struct nf_hook_ops *reg,
|
unsigned int hookcount)
|
{
|
unsigned int i;
|
|
for (i = 0; i < hookcount; i++)
|
nf_unregister_net_hook(net, ®[i]);
|
}
|
EXPORT_SYMBOL(nf_unregister_net_hooks);
|
|
/* Returns 1 if okfn() needs to be executed by the caller,
|
* -EPERM for NF_DROP, 0 otherwise. Caller must hold rcu_read_lock. */
|
int nf_hook_slow(struct sk_buff *skb, struct nf_hook_state *state,
|
const struct nf_hook_entries *e, unsigned int s)
|
{
|
unsigned int verdict;
|
int ret;
|
|
for (; s < e->num_hook_entries; s++) {
|
verdict = nf_hook_entry_hookfn(&e->hooks[s], skb, state);
|
switch (verdict & NF_VERDICT_MASK) {
|
case NF_ACCEPT:
|
break;
|
case NF_DROP:
|
kfree_skb(skb);
|
ret = NF_DROP_GETERR(verdict);
|
if (ret == 0)
|
ret = -EPERM;
|
return ret;
|
case NF_QUEUE:
|
ret = nf_queue(skb, state, s, verdict);
|
if (ret == 1)
|
continue;
|
return ret;
|
default:
|
/* Implicit handling for NF_STOLEN, as well as any other
|
* non conventional verdicts.
|
*/
|
return 0;
|
}
|
}
|
|
return 1;
|
}
|
EXPORT_SYMBOL(nf_hook_slow);
|
|
void nf_hook_slow_list(struct list_head *head, struct nf_hook_state *state,
|
const struct nf_hook_entries *e)
|
{
|
struct sk_buff *skb, *next;
|
struct list_head sublist;
|
int ret;
|
|
INIT_LIST_HEAD(&sublist);
|
|
list_for_each_entry_safe(skb, next, head, list) {
|
skb_list_del_init(skb);
|
ret = nf_hook_slow(skb, state, e, 0);
|
if (ret == 1)
|
list_add_tail(&skb->list, &sublist);
|
}
|
/* Put passed packets back on main list */
|
list_splice(&sublist, head);
|
}
|
EXPORT_SYMBOL(nf_hook_slow_list);
|
|
/* This needs to be compiled in any case to avoid dependencies between the
|
* nfnetlink_queue code and nf_conntrack.
|
*/
|
struct nfnl_ct_hook __rcu *nfnl_ct_hook __read_mostly;
|
EXPORT_SYMBOL_GPL(nfnl_ct_hook);
|
|
struct nf_ct_hook __rcu *nf_ct_hook __read_mostly;
|
EXPORT_SYMBOL_GPL(nf_ct_hook);
|
|
#if IS_ENABLED(CONFIG_NF_CONNTRACK)
|
/* This does not belong here, but locally generated errors need it if connection
|
tracking in use: without this, connection may not be in hash table, and hence
|
manufactured ICMP or RST packets will not be associated with it. */
|
void (*ip_ct_attach)(struct sk_buff *, const struct sk_buff *)
|
__rcu __read_mostly;
|
EXPORT_SYMBOL(ip_ct_attach);
|
|
struct nf_nat_hook __rcu *nf_nat_hook __read_mostly;
|
EXPORT_SYMBOL_GPL(nf_nat_hook);
|
|
void nf_ct_attach(struct sk_buff *new, const struct sk_buff *skb)
|
{
|
void (*attach)(struct sk_buff *, const struct sk_buff *);
|
|
if (skb->_nfct) {
|
rcu_read_lock();
|
attach = rcu_dereference(ip_ct_attach);
|
if (attach)
|
attach(new, skb);
|
rcu_read_unlock();
|
}
|
}
|
EXPORT_SYMBOL(nf_ct_attach);
|
|
void nf_conntrack_destroy(struct nf_conntrack *nfct)
|
{
|
struct nf_ct_hook *ct_hook;
|
|
rcu_read_lock();
|
ct_hook = rcu_dereference(nf_ct_hook);
|
BUG_ON(ct_hook == NULL);
|
ct_hook->destroy(nfct);
|
rcu_read_unlock();
|
}
|
EXPORT_SYMBOL(nf_conntrack_destroy);
|
|
bool nf_ct_get_tuple_skb(struct nf_conntrack_tuple *dst_tuple,
|
const struct sk_buff *skb)
|
{
|
struct nf_ct_hook *ct_hook;
|
bool ret = false;
|
|
rcu_read_lock();
|
ct_hook = rcu_dereference(nf_ct_hook);
|
if (ct_hook)
|
ret = ct_hook->get_tuple_skb(dst_tuple, skb);
|
rcu_read_unlock();
|
return ret;
|
}
|
EXPORT_SYMBOL(nf_ct_get_tuple_skb);
|
|
/* Built-in default zone used e.g. by modules. */
|
const struct nf_conntrack_zone nf_ct_zone_dflt = {
|
.id = NF_CT_DEFAULT_ZONE_ID,
|
.dir = NF_CT_DEFAULT_ZONE_DIR,
|
};
|
EXPORT_SYMBOL_GPL(nf_ct_zone_dflt);
|
#endif /* CONFIG_NF_CONNTRACK */
|
|
static void __net_init
|
__netfilter_net_init(struct nf_hook_entries __rcu **e, int max)
|
{
|
int h;
|
|
for (h = 0; h < max; h++)
|
RCU_INIT_POINTER(e[h], NULL);
|
}
|
|
static int __net_init netfilter_net_init(struct net *net)
|
{
|
__netfilter_net_init(net->nf.hooks_ipv4, ARRAY_SIZE(net->nf.hooks_ipv4));
|
__netfilter_net_init(net->nf.hooks_ipv6, ARRAY_SIZE(net->nf.hooks_ipv6));
|
#ifdef CONFIG_NETFILTER_FAMILY_ARP
|
__netfilter_net_init(net->nf.hooks_arp, ARRAY_SIZE(net->nf.hooks_arp));
|
#endif
|
#ifdef CONFIG_NETFILTER_FAMILY_BRIDGE
|
__netfilter_net_init(net->nf.hooks_bridge, ARRAY_SIZE(net->nf.hooks_bridge));
|
#endif
|
#if IS_ENABLED(CONFIG_DECNET)
|
__netfilter_net_init(net->nf.hooks_decnet, ARRAY_SIZE(net->nf.hooks_decnet));
|
#endif
|
|
#ifdef CONFIG_PROC_FS
|
net->nf.proc_netfilter = proc_net_mkdir(net, "netfilter",
|
net->proc_net);
|
if (!net->nf.proc_netfilter) {
|
if (!net_eq(net, &init_net))
|
pr_err("cannot create netfilter proc entry");
|
|
return -ENOMEM;
|
}
|
#endif
|
|
return 0;
|
}
|
|
static void __net_exit netfilter_net_exit(struct net *net)
|
{
|
remove_proc_entry("netfilter", net->proc_net);
|
}
|
|
static struct pernet_operations netfilter_net_ops = {
|
.init = netfilter_net_init,
|
.exit = netfilter_net_exit,
|
};
|
|
int __init netfilter_init(void)
|
{
|
int ret;
|
|
ret = register_pernet_subsys(&netfilter_net_ops);
|
if (ret < 0)
|
goto err;
|
|
ret = netfilter_log_init();
|
if (ret < 0)
|
goto err_pernet;
|
|
return 0;
|
err_pernet:
|
unregister_pernet_subsys(&netfilter_net_ops);
|
err:
|
return ret;
|
}
|
