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Release 4.14 net/netfilter/nf_conntrack_extend.c

Directory: net/netfilter
/* Structure dynamic extension infrastructure
 * Copyright (C) 2004 Rusty Russell IBM Corporation
 * Copyright (C) 2007 Netfilter Core Team <>
 * Copyright (C) 2007 USAGI/WIDE Project <>
 *      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);

#define NF_CT_EXT_PREALLOC	128u 
/* conntrack events are on by default */

void nf_ct_ext_destroy(struct nf_conn *ct) { unsigned int i; struct nf_ct_ext_type *t; for (i = 0; i < NF_CT_EXT_NUM; i++) { 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(); } }


Yasuyuki Kozakai6598.48%150.00%
Liping Zhang11.52%150.00%

void *nf_ct_ext_add(struct nf_conn *ct, enum nf_ct_ext_id id, gfp_t gfp) { unsigned int newlen, newoff, oldlen, alloc; struct nf_ct_ext *old, *new; struct nf_ct_ext_type *t; /* Conntrack must not be confirmed to avoid races on reallocation. */ WARN_ON(nf_ct_is_confirmed(ct)); old = ct->ext; if (old) { if (__nf_ct_ext_exist(old, id)) return NULL; oldlen = old->len; } else { oldlen = sizeof(*new); } rcu_read_lock(); t = rcu_dereference(nf_ct_ext_types[id]); if (!t) { rcu_read_unlock(); return NULL; } newoff = ALIGN(oldlen, t->align); newlen = newoff + t->len; rcu_read_unlock(); alloc = max(newlen, NF_CT_EXT_PREALLOC); new = __krealloc(old, alloc, gfp); if (!new) return NULL; if (!old) { memset(new->offset, 0, sizeof(new->offset)); ct->ext = new; } else 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; }


Yasuyuki Kozakai13852.67%17.14%
Florian Westphal7327.86%321.43%
Changli Gao145.34%17.14%
Patrick McHardy134.96%321.43%
Liping Zhang114.20%17.14%
Pekka J Enberg103.82%321.43%
Lai Jiangshan20.76%17.14%
Varsha Rao10.38%17.14%

EXPORT_SYMBOL(nf_ct_ext_add); /* This MUST be called in process context. */
int nf_ct_extend_register(const 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; } rcu_assign_pointer(nf_ct_ext_types[type->id], type); out: mutex_unlock(&nf_ct_ext_type_mutex); return ret; }


Yasuyuki Kozakai6296.88%133.33%
Eric Dumazet11.56%133.33%
Florian Westphal11.56%133.33%

EXPORT_SYMBOL_GPL(nf_ct_extend_register); /* This MUST be called in process context. */
void nf_ct_extend_unregister(const struct nf_ct_ext_type *type) { mutex_lock(&nf_ct_ext_type_mutex); RCU_INIT_POINTER(nf_ct_ext_types[type->id], NULL); mutex_unlock(&nf_ct_ext_type_mutex); synchronize_rcu(); }


Yasuyuki Kozakai3592.11%125.00%
Liping Zhang12.63%125.00%
Stephen Hemminger12.63%125.00%
Florian Westphal12.63%125.00%


Overall Contributors

Yasuyuki Kozakai35772.12%15.00%
Florian Westphal8116.36%525.00%
Changli Gao142.83%15.00%
Liping Zhang142.83%210.00%
Patrick McHardy132.63%315.00%
Pekka J Enberg102.02%315.00%
Lai Jiangshan20.40%15.00%
Eric Dumazet10.20%15.00%
Stephen Hemminger10.20%15.00%
Arnd Bergmann10.20%15.00%
Varsha Rao10.20%15.00%
Directory: net/netfilter
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