cbef426ce7
EEXIST is used for an object that already exists, with the same
name/handle. However, there no same object there, instead there is a
object that is using the single slot that is available for NAT hooks
since patch f92b40a8b2
("netfilter: core: only allow one nat hook per
hook point"). Let's change this return value before this behaviour gets
exposed in the first -rc.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
652 lines
15 KiB
C
652 lines
15 KiB
C
/* netfilter.c: look after the filters for various protocols.
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* Heavily influenced by the old firewall.c by David Bonn and Alan Cox.
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*
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* Thanks to Rob `CmdrTaco' Malda for not influencing this code in any
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* way.
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*
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* This code is GPL.
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*/
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#include <linux/kernel.h>
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#include <linux/netfilter.h>
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#include <net/protocol.h>
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#include <linux/init.h>
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#include <linux/skbuff.h>
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#include <linux/wait.h>
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/if.h>
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#include <linux/netdevice.h>
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#include <linux/netfilter_ipv6.h>
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#include <linux/inetdevice.h>
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#include <linux/proc_fs.h>
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#include <linux/mutex.h>
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#include <linux/mm.h>
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#include <linux/rcupdate.h>
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#include <net/net_namespace.h>
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#include <net/sock.h>
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#include "nf_internals.h"
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const struct nf_ipv6_ops __rcu *nf_ipv6_ops __read_mostly;
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EXPORT_SYMBOL_GPL(nf_ipv6_ops);
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DEFINE_PER_CPU(bool, nf_skb_duplicated);
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EXPORT_SYMBOL_GPL(nf_skb_duplicated);
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#ifdef HAVE_JUMP_LABEL
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struct static_key nf_hooks_needed[NFPROTO_NUMPROTO][NF_MAX_HOOKS];
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EXPORT_SYMBOL(nf_hooks_needed);
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#endif
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static DEFINE_MUTEX(nf_hook_mutex);
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/* max hooks per family/hooknum */
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#define MAX_HOOK_COUNT 1024
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#define nf_entry_dereference(e) \
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rcu_dereference_protected(e, lockdep_is_held(&nf_hook_mutex))
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static struct nf_hook_entries *allocate_hook_entries_size(u16 num)
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{
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struct nf_hook_entries *e;
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size_t alloc = sizeof(*e) +
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sizeof(struct nf_hook_entry) * num +
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sizeof(struct nf_hook_ops *) * num +
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sizeof(struct nf_hook_entries_rcu_head);
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if (num == 0)
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return NULL;
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e = kvzalloc(alloc, GFP_KERNEL);
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if (e)
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e->num_hook_entries = num;
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return e;
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}
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static void __nf_hook_entries_free(struct rcu_head *h)
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{
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struct nf_hook_entries_rcu_head *head;
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head = container_of(h, struct nf_hook_entries_rcu_head, head);
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kvfree(head->allocation);
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}
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static void nf_hook_entries_free(struct nf_hook_entries *e)
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{
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struct nf_hook_entries_rcu_head *head;
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struct nf_hook_ops **ops;
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unsigned int num;
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if (!e)
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return;
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num = e->num_hook_entries;
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ops = nf_hook_entries_get_hook_ops(e);
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head = (void *)&ops[num];
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head->allocation = e;
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call_rcu(&head->head, __nf_hook_entries_free);
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}
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static unsigned int accept_all(void *priv,
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struct sk_buff *skb,
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const struct nf_hook_state *state)
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{
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return NF_ACCEPT; /* ACCEPT makes nf_hook_slow call next hook */
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}
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static const struct nf_hook_ops dummy_ops = {
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.hook = accept_all,
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.priority = INT_MIN,
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};
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static struct nf_hook_entries *
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nf_hook_entries_grow(const struct nf_hook_entries *old,
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const struct nf_hook_ops *reg)
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{
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unsigned int i, alloc_entries, nhooks, old_entries;
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struct nf_hook_ops **orig_ops = NULL;
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struct nf_hook_ops **new_ops;
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struct nf_hook_entries *new;
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bool inserted = false;
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alloc_entries = 1;
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old_entries = old ? old->num_hook_entries : 0;
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if (old) {
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orig_ops = nf_hook_entries_get_hook_ops(old);
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for (i = 0; i < old_entries; i++) {
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if (orig_ops[i] != &dummy_ops)
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alloc_entries++;
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}
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}
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if (alloc_entries > MAX_HOOK_COUNT)
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return ERR_PTR(-E2BIG);
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new = allocate_hook_entries_size(alloc_entries);
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if (!new)
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return ERR_PTR(-ENOMEM);
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new_ops = nf_hook_entries_get_hook_ops(new);
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i = 0;
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nhooks = 0;
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while (i < old_entries) {
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if (orig_ops[i] == &dummy_ops) {
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++i;
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continue;
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}
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if (reg->nat_hook && orig_ops[i]->nat_hook) {
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kvfree(new);
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return ERR_PTR(-EBUSY);
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}
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if (inserted || reg->priority > orig_ops[i]->priority) {
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new_ops[nhooks] = (void *)orig_ops[i];
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new->hooks[nhooks] = old->hooks[i];
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i++;
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} else {
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new_ops[nhooks] = (void *)reg;
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new->hooks[nhooks].hook = reg->hook;
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new->hooks[nhooks].priv = reg->priv;
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inserted = true;
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}
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nhooks++;
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}
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if (!inserted) {
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new_ops[nhooks] = (void *)reg;
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new->hooks[nhooks].hook = reg->hook;
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new->hooks[nhooks].priv = reg->priv;
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}
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return new;
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}
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static void hooks_validate(const struct nf_hook_entries *hooks)
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{
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#ifdef CONFIG_DEBUG_KERNEL
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struct nf_hook_ops **orig_ops;
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int prio = INT_MIN;
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size_t i = 0;
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orig_ops = nf_hook_entries_get_hook_ops(hooks);
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for (i = 0; i < hooks->num_hook_entries; i++) {
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if (orig_ops[i] == &dummy_ops)
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continue;
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WARN_ON(orig_ops[i]->priority < prio);
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if (orig_ops[i]->priority > prio)
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prio = orig_ops[i]->priority;
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}
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#endif
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}
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/*
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* __nf_hook_entries_try_shrink - try to shrink hook array
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*
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* @pp -- location of hook blob
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*
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* Hook unregistration must always succeed, so to-be-removed hooks
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* are replaced by a dummy one that will just move to next hook.
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*
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* This counts the current dummy hooks, attempts to allocate new blob,
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* copies the live hooks, then replaces and discards old one.
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*
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* return values:
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*
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* Returns address to free, or NULL.
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*/
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static void *__nf_hook_entries_try_shrink(struct nf_hook_entries __rcu **pp)
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{
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struct nf_hook_entries *old, *new = NULL;
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unsigned int i, j, skip = 0, hook_entries;
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struct nf_hook_ops **orig_ops;
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struct nf_hook_ops **new_ops;
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old = nf_entry_dereference(*pp);
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if (WARN_ON_ONCE(!old))
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return NULL;
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orig_ops = nf_hook_entries_get_hook_ops(old);
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for (i = 0; i < old->num_hook_entries; i++) {
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if (orig_ops[i] == &dummy_ops)
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skip++;
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}
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/* if skip == hook_entries all hooks have been removed */
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hook_entries = old->num_hook_entries;
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if (skip == hook_entries)
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goto out_assign;
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if (skip == 0)
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return NULL;
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hook_entries -= skip;
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new = allocate_hook_entries_size(hook_entries);
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if (!new)
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return NULL;
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new_ops = nf_hook_entries_get_hook_ops(new);
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for (i = 0, j = 0; i < old->num_hook_entries; i++) {
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if (orig_ops[i] == &dummy_ops)
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continue;
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new->hooks[j] = old->hooks[i];
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new_ops[j] = (void *)orig_ops[i];
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j++;
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}
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hooks_validate(new);
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out_assign:
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rcu_assign_pointer(*pp, new);
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return old;
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}
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static struct nf_hook_entries __rcu **
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nf_hook_entry_head(struct net *net, int pf, unsigned int hooknum,
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struct net_device *dev)
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{
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switch (pf) {
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case NFPROTO_NETDEV:
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break;
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#ifdef CONFIG_NETFILTER_FAMILY_ARP
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case NFPROTO_ARP:
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if (WARN_ON_ONCE(ARRAY_SIZE(net->nf.hooks_arp) <= hooknum))
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return NULL;
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return net->nf.hooks_arp + hooknum;
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#endif
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#ifdef CONFIG_NETFILTER_FAMILY_BRIDGE
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case NFPROTO_BRIDGE:
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if (WARN_ON_ONCE(ARRAY_SIZE(net->nf.hooks_bridge) <= hooknum))
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return NULL;
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return net->nf.hooks_bridge + hooknum;
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#endif
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case NFPROTO_IPV4:
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if (WARN_ON_ONCE(ARRAY_SIZE(net->nf.hooks_ipv4) <= hooknum))
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return NULL;
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return net->nf.hooks_ipv4 + hooknum;
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case NFPROTO_IPV6:
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if (WARN_ON_ONCE(ARRAY_SIZE(net->nf.hooks_ipv6) <= hooknum))
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return NULL;
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return net->nf.hooks_ipv6 + hooknum;
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#if IS_ENABLED(CONFIG_DECNET)
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case NFPROTO_DECNET:
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if (WARN_ON_ONCE(ARRAY_SIZE(net->nf.hooks_decnet) <= hooknum))
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return NULL;
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return net->nf.hooks_decnet + hooknum;
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#endif
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default:
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WARN_ON_ONCE(1);
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return NULL;
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}
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#ifdef CONFIG_NETFILTER_INGRESS
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if (hooknum == NF_NETDEV_INGRESS) {
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if (dev && dev_net(dev) == net)
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return &dev->nf_hooks_ingress;
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}
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#endif
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WARN_ON_ONCE(1);
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return NULL;
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}
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static int __nf_register_net_hook(struct net *net, int pf,
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const struct nf_hook_ops *reg)
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{
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struct nf_hook_entries *p, *new_hooks;
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struct nf_hook_entries __rcu **pp;
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if (pf == NFPROTO_NETDEV) {
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#ifndef CONFIG_NETFILTER_INGRESS
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if (reg->hooknum == NF_NETDEV_INGRESS)
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return -EOPNOTSUPP;
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#endif
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if (reg->hooknum != NF_NETDEV_INGRESS ||
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!reg->dev || dev_net(reg->dev) != net)
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return -EINVAL;
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}
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pp = nf_hook_entry_head(net, pf, reg->hooknum, reg->dev);
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if (!pp)
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return -EINVAL;
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mutex_lock(&nf_hook_mutex);
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p = nf_entry_dereference(*pp);
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new_hooks = nf_hook_entries_grow(p, reg);
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if (!IS_ERR(new_hooks))
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rcu_assign_pointer(*pp, new_hooks);
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mutex_unlock(&nf_hook_mutex);
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if (IS_ERR(new_hooks))
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return PTR_ERR(new_hooks);
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hooks_validate(new_hooks);
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#ifdef CONFIG_NETFILTER_INGRESS
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if (pf == NFPROTO_NETDEV && reg->hooknum == NF_NETDEV_INGRESS)
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net_inc_ingress_queue();
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#endif
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#ifdef HAVE_JUMP_LABEL
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static_key_slow_inc(&nf_hooks_needed[pf][reg->hooknum]);
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#endif
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BUG_ON(p == new_hooks);
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nf_hook_entries_free(p);
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return 0;
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}
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/*
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* nf_remove_net_hook - remove a hook from blob
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*
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* @oldp: current address of hook blob
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* @unreg: hook to unregister
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*
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* This cannot fail, hook unregistration must always succeed.
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* Therefore replace the to-be-removed hook with a dummy hook.
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*/
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static void nf_remove_net_hook(struct nf_hook_entries *old,
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const struct nf_hook_ops *unreg, int pf)
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{
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struct nf_hook_ops **orig_ops;
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bool found = false;
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unsigned int i;
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orig_ops = nf_hook_entries_get_hook_ops(old);
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for (i = 0; i < old->num_hook_entries; i++) {
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if (orig_ops[i] != unreg)
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continue;
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WRITE_ONCE(old->hooks[i].hook, accept_all);
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WRITE_ONCE(orig_ops[i], &dummy_ops);
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found = true;
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break;
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}
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if (found) {
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#ifdef CONFIG_NETFILTER_INGRESS
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if (pf == NFPROTO_NETDEV && unreg->hooknum == NF_NETDEV_INGRESS)
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net_dec_ingress_queue();
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#endif
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#ifdef HAVE_JUMP_LABEL
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static_key_slow_dec(&nf_hooks_needed[pf][unreg->hooknum]);
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#endif
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} else {
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WARN_ONCE(1, "hook not found, pf %d num %d", pf, unreg->hooknum);
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}
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}
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static void __nf_unregister_net_hook(struct net *net, int pf,
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const struct nf_hook_ops *reg)
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{
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struct nf_hook_entries __rcu **pp;
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struct nf_hook_entries *p;
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pp = nf_hook_entry_head(net, pf, reg->hooknum, reg->dev);
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if (!pp)
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return;
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mutex_lock(&nf_hook_mutex);
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p = nf_entry_dereference(*pp);
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if (WARN_ON_ONCE(!p)) {
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mutex_unlock(&nf_hook_mutex);
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return;
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}
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nf_remove_net_hook(p, reg, pf);
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p = __nf_hook_entries_try_shrink(pp);
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mutex_unlock(&nf_hook_mutex);
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if (!p)
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return;
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nf_queue_nf_hook_drop(net);
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nf_hook_entries_free(p);
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}
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void nf_unregister_net_hook(struct net *net, const struct nf_hook_ops *reg)
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{
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if (reg->pf == NFPROTO_INET) {
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__nf_unregister_net_hook(net, NFPROTO_IPV4, reg);
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__nf_unregister_net_hook(net, NFPROTO_IPV6, reg);
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} else {
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__nf_unregister_net_hook(net, reg->pf, reg);
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}
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}
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EXPORT_SYMBOL(nf_unregister_net_hook);
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int nf_register_net_hook(struct net *net, const struct nf_hook_ops *reg)
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{
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int err;
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if (reg->pf == NFPROTO_INET) {
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err = __nf_register_net_hook(net, NFPROTO_IPV4, reg);
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if (err < 0)
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return err;
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err = __nf_register_net_hook(net, NFPROTO_IPV6, reg);
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if (err < 0) {
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__nf_unregister_net_hook(net, NFPROTO_IPV4, reg);
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return err;
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}
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} else {
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err = __nf_register_net_hook(net, reg->pf, reg);
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if (err < 0)
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return err;
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}
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return 0;
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}
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EXPORT_SYMBOL(nf_register_net_hook);
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int nf_register_net_hooks(struct net *net, const struct nf_hook_ops *reg,
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unsigned int n)
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{
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unsigned int i;
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int err = 0;
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for (i = 0; i < n; i++) {
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err = nf_register_net_hook(net, ®[i]);
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if (err)
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goto err;
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}
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return err;
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err:
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if (i > 0)
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nf_unregister_net_hooks(net, reg, i);
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return err;
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}
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EXPORT_SYMBOL(nf_register_net_hooks);
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void nf_unregister_net_hooks(struct net *net, const struct nf_hook_ops *reg,
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unsigned int hookcount)
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{
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unsigned int i;
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for (i = 0; i < hookcount; i++)
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nf_unregister_net_hook(net, ®[i]);
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}
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EXPORT_SYMBOL(nf_unregister_net_hooks);
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/* Returns 1 if okfn() needs to be executed by the caller,
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* -EPERM for NF_DROP, 0 otherwise. Caller must hold rcu_read_lock. */
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int nf_hook_slow(struct sk_buff *skb, struct nf_hook_state *state,
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const struct nf_hook_entries *e, unsigned int s)
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{
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unsigned int verdict;
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int ret;
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for (; s < e->num_hook_entries; s++) {
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verdict = nf_hook_entry_hookfn(&e->hooks[s], skb, state);
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switch (verdict & NF_VERDICT_MASK) {
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case NF_ACCEPT:
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break;
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case NF_DROP:
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kfree_skb(skb);
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ret = NF_DROP_GETERR(verdict);
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if (ret == 0)
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ret = -EPERM;
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return ret;
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case NF_QUEUE:
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ret = nf_queue(skb, state, e, s, verdict);
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if (ret == 1)
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continue;
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return ret;
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default:
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/* Implicit handling for NF_STOLEN, as well as any other
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* non conventional verdicts.
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*/
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return 0;
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}
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}
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return 1;
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}
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EXPORT_SYMBOL(nf_hook_slow);
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int skb_make_writable(struct sk_buff *skb, unsigned int writable_len)
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{
|
|
if (writable_len > skb->len)
|
|
return 0;
|
|
|
|
/* Not exclusive use of packet? Must copy. */
|
|
if (!skb_cloned(skb)) {
|
|
if (writable_len <= skb_headlen(skb))
|
|
return 1;
|
|
} else if (skb_clone_writable(skb, writable_len))
|
|
return 1;
|
|
|
|
if (writable_len <= skb_headlen(skb))
|
|
writable_len = 0;
|
|
else
|
|
writable_len -= skb_headlen(skb);
|
|
|
|
return !!__pskb_pull_tail(skb, writable_len);
|
|
}
|
|
EXPORT_SYMBOL(skb_make_writable);
|
|
|
|
/* 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);
|
|
|
|
#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);
|
|
|
|
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_ct_destroy)(struct nf_conntrack *) __rcu __read_mostly;
|
|
EXPORT_SYMBOL(nf_ct_destroy);
|
|
|
|
void nf_conntrack_destroy(struct nf_conntrack *nfct)
|
|
{
|
|
void (*destroy)(struct nf_conntrack *);
|
|
|
|
rcu_read_lock();
|
|
destroy = rcu_dereference(nf_ct_destroy);
|
|
BUG_ON(destroy == NULL);
|
|
destroy(nfct);
|
|
rcu_read_unlock();
|
|
}
|
|
EXPORT_SYMBOL(nf_conntrack_destroy);
|
|
|
|
/* 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 */
|
|
|
|
#ifdef CONFIG_NF_NAT_NEEDED
|
|
void (*nf_nat_decode_session_hook)(struct sk_buff *, struct flowi *);
|
|
EXPORT_SYMBOL(nf_nat_decode_session_hook);
|
|
#endif
|
|
|
|
static void __net_init __netfilter_net_init(struct nf_hook_entries **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;
|
|
}
|