-/* netfilter.c: look after the filters for various protocols.
+/* 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.
*
* Rusty Russell (C)2000 -- This code is GPL.
- *
- * February 2000: Modified by James Morris to have 1 queue per protocol.
- * 15-Mar-2000: Added NF_REPEAT --RR.
- * 08-May-2003: Internal logging interface added by Jozsef Kadlecsik.
*/
#include <linux/kernel.h>
#include <linux/netfilter.h>
#include <linux/netdevice.h>
#include <linux/inetdevice.h>
#include <linux/proc_fs.h>
+#include <linux/mutex.h>
#include <net/sock.h>
#include "nf_internals.h"
-static DEFINE_SPINLOCK(afinfo_lock);
+static DEFINE_MUTEX(afinfo_mutex);
-struct nf_afinfo *nf_afinfo[NPROTO];
+struct nf_afinfo *nf_afinfo[NPROTO] __read_mostly;
EXPORT_SYMBOL(nf_afinfo);
int nf_register_afinfo(struct nf_afinfo *afinfo)
{
- spin_lock(&afinfo_lock);
+ int err;
+
+ err = mutex_lock_interruptible(&afinfo_mutex);
+ if (err < 0)
+ return err;
rcu_assign_pointer(nf_afinfo[afinfo->family], afinfo);
- spin_unlock(&afinfo_lock);
+ mutex_unlock(&afinfo_mutex);
return 0;
}
EXPORT_SYMBOL_GPL(nf_register_afinfo);
void nf_unregister_afinfo(struct nf_afinfo *afinfo)
{
- spin_lock(&afinfo_lock);
+ mutex_lock(&afinfo_mutex);
rcu_assign_pointer(nf_afinfo[afinfo->family], NULL);
- spin_unlock(&afinfo_lock);
+ mutex_unlock(&afinfo_mutex);
synchronize_rcu();
}
EXPORT_SYMBOL_GPL(nf_unregister_afinfo);
* of skbuffs queued for userspace, and not deregister a hook unless
* this is zero, but that sucks. Now, we simply check when the
* packets come back: if the hook is gone, the packet is discarded. */
-struct list_head nf_hooks[NPROTO][NF_MAX_HOOKS];
+struct list_head nf_hooks[NPROTO][NF_MAX_HOOKS] __read_mostly;
EXPORT_SYMBOL(nf_hooks);
-static DEFINE_SPINLOCK(nf_hook_lock);
+static DEFINE_MUTEX(nf_hook_mutex);
int nf_register_hook(struct nf_hook_ops *reg)
{
struct list_head *i;
+ int err;
- spin_lock_bh(&nf_hook_lock);
+ err = mutex_lock_interruptible(&nf_hook_mutex);
+ if (err < 0)
+ return err;
list_for_each(i, &nf_hooks[reg->pf][reg->hooknum]) {
if (reg->priority < ((struct nf_hook_ops *)i)->priority)
break;
}
list_add_rcu(®->list, i->prev);
- spin_unlock_bh(&nf_hook_lock);
-
- synchronize_net();
+ mutex_unlock(&nf_hook_mutex);
return 0;
}
EXPORT_SYMBOL(nf_register_hook);
void nf_unregister_hook(struct nf_hook_ops *reg)
{
- spin_lock_bh(&nf_hook_lock);
+ mutex_lock(&nf_hook_mutex);
list_del_rcu(®->list);
- spin_unlock_bh(&nf_hook_lock);
+ mutex_unlock(&nf_hook_mutex);
synchronize_net();
}
continue;
/* Optimization: we don't need to hold module
- reference here, since function can't sleep. --RR */
+ reference here, since function can't sleep. --RR */
verdict = elem->hook(hook, skb, indev, outdev, okfn);
if (verdict != NF_ACCEPT) {
#ifdef CONFIG_NETFILTER_DEBUG
if (unlikely((verdict & NF_VERDICT_MASK)
> NF_MAX_VERDICT)) {
NFDEBUG("Evil return from %p(%u).\n",
- elem->hook, hook);
+ elem->hook, hook);
continue;
}
#endif
}
EXPORT_SYMBOL(skb_make_writable);
-u_int16_t nf_csum_update(u_int32_t oldval, u_int32_t newval, u_int32_t csum)
-{
- u_int32_t diff[] = { oldval, newval };
-
- return csum_fold(csum_partial((char *)diff, sizeof(diff), ~csum));
-}
-EXPORT_SYMBOL(nf_csum_update);
-
-u_int16_t nf_proto_csum_update(struct sk_buff *skb,
- u_int32_t oldval, u_int32_t newval,
- u_int16_t csum, int pseudohdr)
+void nf_proto_csum_replace4(__sum16 *sum, struct sk_buff *skb,
+ __be32 from, __be32 to, int pseudohdr)
{
+ __be32 diff[] = { ~from, to };
if (skb->ip_summed != CHECKSUM_PARTIAL) {
- csum = nf_csum_update(oldval, newval, csum);
+ *sum = csum_fold(csum_partial((char *)diff, sizeof(diff),
+ ~csum_unfold(*sum)));
if (skb->ip_summed == CHECKSUM_COMPLETE && pseudohdr)
- skb->csum = nf_csum_update(oldval, newval, skb->csum);
+ skb->csum = ~csum_partial((char *)diff, sizeof(diff),
+ ~skb->csum);
} else if (pseudohdr)
- csum = ~nf_csum_update(oldval, newval, ~csum);
-
- return csum;
+ *sum = ~csum_fold(csum_partial((char *)diff, sizeof(diff),
+ csum_unfold(*sum)));
}
-EXPORT_SYMBOL(nf_proto_csum_update);
+EXPORT_SYMBOL(nf_proto_csum_replace4);
+#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
/* 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 (*attach)(struct sk_buff *, struct sk_buff *);
- if (skb->nfct && (attach = ip_ct_attach) != NULL) {
- mb(); /* Just to be sure: must be read before executing this */
- attach(new, skb);
+ 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 *);
+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);
+#endif /* CONFIG_NF_CONNTRACK */
+
#ifdef CONFIG_PROC_FS
struct proc_dir_entry *proc_net_netfilter;
EXPORT_SYMBOL(proc_net_netfilter);