Release 4.11 net/netfilter/nf_conntrack_extend.c
/* Structure dynamic extension infrastructure
* Copyright (C) 2004 Rusty Russell IBM Corporation
* Copyright (C) 2007 Netfilter Core Team <coreteam@netfilter.org>
* Copyright (C) 2007 USAGI/WIDE Project <http://www.linux-ipv6.org>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/rcupdate.h>
#include <linux/slab.h>
#include <linux/skbuff.h>
#include <net/netfilter/nf_conntrack_extend.h>
static struct nf_ct_ext_type __rcu *nf_ct_ext_types[NF_CT_EXT_NUM];
static DEFINE_MUTEX(nf_ct_ext_type_mutex);
void __nf_ct_ext_destroy(struct nf_conn *ct)
{
unsigned int i;
struct nf_ct_ext_type *t;
struct nf_ct_ext *ext = ct->ext;
for (i = 0; i < NF_CT_EXT_NUM; i++) {
if (!__nf_ct_ext_exist(ext, i))
continue;
rcu_read_lock();
t = rcu_dereference(nf_ct_ext_types[i]);
/* Here the nf_ct_ext_type might have been unregisterd.
* I.e., it has responsible to cleanup private
* area in all conntracks when it is unregisterd.
*/
if (t && t->destroy)
t->destroy(ct);
rcu_read_unlock();
}
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Yasuyuki Kozakai | 75 | 87.21% | 1 | 50.00% |
Changli Gao | 11 | 12.79% | 1 | 50.00% |
Total | 86 | 100.00% | 2 | 100.00% |
EXPORT_SYMBOL(__nf_ct_ext_destroy);
static void *
nf_ct_ext_create(struct nf_ct_ext **ext, enum nf_ct_ext_id id,
size_t var_alloc_len, gfp_t gfp)
{
unsigned int off, len;
struct nf_ct_ext_type *t;
size_t alloc_size;
rcu_read_lock();
t = rcu_dereference(nf_ct_ext_types[id]);
if (!t) {
rcu_read_unlock();
return NULL;
}
off = ALIGN(sizeof(struct nf_ct_ext), t->align);
len = off + t->len + var_alloc_len;
alloc_size = t->alloc_size + var_alloc_len;
rcu_read_unlock();
*ext = kzalloc(alloc_size, gfp);
if (!*ext)
return NULL;
(*ext)->offset[id] = off;
(*ext)->len = len;
return (void *)(*ext) + off;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Yasuyuki Kozakai | 123 | 81.46% | 1 | 20.00% |
Liping Zhang | 11 | 7.28% | 1 | 20.00% |
Eric Dumazet | 9 | 5.96% | 1 | 20.00% |
Pablo Neira Ayuso | 7 | 4.64% | 1 | 20.00% |
Pekka J Enberg | 1 | 0.66% | 1 | 20.00% |
Total | 151 | 100.00% | 5 | 100.00% |
void *__nf_ct_ext_add_length(struct nf_conn *ct, enum nf_ct_ext_id id,
size_t var_alloc_len, gfp_t gfp)
{
struct nf_ct_ext *old, *new;
int newlen, newoff;
struct nf_ct_ext_type *t;
/* Conntrack must not be confirmed to avoid races on reallocation. */
NF_CT_ASSERT(!nf_ct_is_confirmed(ct));
old = ct->ext;
if (!old)
return nf_ct_ext_create(&ct->ext, id, var_alloc_len, gfp);
if (__nf_ct_ext_exist(old, id))
return NULL;
rcu_read_lock();
t = rcu_dereference(nf_ct_ext_types[id]);
if (!t) {
rcu_read_unlock();
return NULL;
}
newoff = ALIGN(old->len, t->align);
newlen = newoff + t->len + var_alloc_len;
rcu_read_unlock();
new = __krealloc(old, newlen, gfp);
if (!new)
return NULL;
if (new != old) {
kfree_rcu(old, rcu);
rcu_assign_pointer(ct->ext, new);
}
new->offset[id] = newoff;
new->len = newlen;
memset((void *)new + newoff, 0, newlen - newoff);
return (void *)new + newoff;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Yasuyuki Kozakai | 157 | 70.40% | 1 | 8.33% |
Changli Gao | 16 | 7.17% | 1 | 8.33% |
Patrick McHardy | 15 | 6.73% | 3 | 25.00% |
Liping Zhang | 11 | 4.93% | 1 | 8.33% |
Pekka J Enberg | 10 | 4.48% | 3 | 25.00% |
Pablo Neira Ayuso | 8 | 3.59% | 1 | 8.33% |
Florian Westphal | 4 | 1.79% | 1 | 8.33% |
Lai Jiangshan | 2 | 0.90% | 1 | 8.33% |
Total | 223 | 100.00% | 12 | 100.00% |
EXPORT_SYMBOL(__nf_ct_ext_add_length);
static void update_alloc_size(struct nf_ct_ext_type *type)
{
int i, j;
struct nf_ct_ext_type *t1, *t2;
enum nf_ct_ext_id min = 0, max = NF_CT_EXT_NUM - 1;
/* unnecessary to update all types */
if ((type->flags & NF_CT_EXT_F_PREALLOC) == 0) {
min = type->id;
max = type->id;
}
/* This assumes that extended areas in conntrack for the types
whose NF_CT_EXT_F_PREALLOC bit set are allocated in order */
for (i = min; i <= max; i++) {
t1 = rcu_dereference_protected(nf_ct_ext_types[i],
lockdep_is_held(&nf_ct_ext_type_mutex));
if (!t1)
continue;
t1->alloc_size = ALIGN(sizeof(struct nf_ct_ext), t1->align) +
t1->len;
for (j = 0; j < NF_CT_EXT_NUM; j++) {
t2 = rcu_dereference_protected(nf_ct_ext_types[j],
lockdep_is_held(&nf_ct_ext_type_mutex));
if (t2 == NULL || t2 == t1 ||
(t2->flags & NF_CT_EXT_F_PREALLOC) == 0)
continue;
t1->alloc_size = ALIGN(t1->alloc_size, t2->align)
+ t2->len;
}
}
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Yasuyuki Kozakai | 175 | 90.67% | 1 | 50.00% |
Eric Dumazet | 18 | 9.33% | 1 | 50.00% |
Total | 193 | 100.00% | 2 | 100.00% |
/* This MUST be called in process context. */
int nf_ct_extend_register(struct nf_ct_ext_type *type)
{
int ret = 0;
mutex_lock(&nf_ct_ext_type_mutex);
if (nf_ct_ext_types[type->id]) {
ret = -EBUSY;
goto out;
}
/* This ensures that nf_ct_ext_create() can allocate enough area
before updating alloc_size */
type->alloc_size = ALIGN(sizeof(struct nf_ct_ext), type->align)
+ type->len;
rcu_assign_pointer(nf_ct_ext_types[type->id], type);
update_alloc_size(type);
out:
mutex_unlock(&nf_ct_ext_type_mutex);
return ret;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Yasuyuki Kozakai | 89 | 98.89% | 1 | 50.00% |
Eric Dumazet | 1 | 1.11% | 1 | 50.00% |
Total | 90 | 100.00% | 2 | 100.00% |
EXPORT_SYMBOL_GPL(nf_ct_extend_register);
/* This MUST be called in process context. */
void nf_ct_extend_unregister(struct nf_ct_ext_type *type)
{
mutex_lock(&nf_ct_ext_type_mutex);
RCU_INIT_POINTER(nf_ct_ext_types[type->id], NULL);
update_alloc_size(type);
mutex_unlock(&nf_ct_ext_type_mutex);
synchronize_rcu();
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Yasuyuki Kozakai | 40 | 95.24% | 1 | 33.33% |
Stephen Hemminger | 1 | 2.38% | 1 | 33.33% |
Liping Zhang | 1 | 2.38% | 1 | 33.33% |
Total | 42 | 100.00% | 3 | 100.00% |
EXPORT_SYMBOL_GPL(nf_ct_extend_unregister);
Overall Contributors
Person | Tokens | Prop | Commits | CommitProp |
Yasuyuki Kozakai | 717 | 84.85% | 1 | 5.88% |
Eric Dumazet | 28 | 3.31% | 3 | 17.65% |
Changli Gao | 27 | 3.20% | 1 | 5.88% |
Liping Zhang | 23 | 2.72% | 1 | 5.88% |
Pablo Neira Ayuso | 16 | 1.89% | 1 | 5.88% |
Patrick McHardy | 15 | 1.78% | 3 | 17.65% |
Pekka J Enberg | 11 | 1.30% | 3 | 17.65% |
Florian Westphal | 4 | 0.47% | 1 | 5.88% |
Lai Jiangshan | 2 | 0.24% | 1 | 5.88% |
Stephen Hemminger | 1 | 0.12% | 1 | 5.88% |
Arnd Bergmann | 1 | 0.12% | 1 | 5.88% |
Total | 845 | 100.00% | 17 | 100.00% |
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