[NETFILTER]: nf_conntrack: split out protocol handling
This patch splits out L3/L4 protocol handling into its own file nf_conntrack_proto.c Signed-off-by: Martin Josefsson <gandalf@wlug.westbo.se> Signed-off-by: Patrick McHardy <kaber@trash.net>
This commit is contained in:
Martin Josefsson
David S. Miller
Родитель
f61801218a
Коммит
8f03dea52b
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@ -1,6 +1,6 @@
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netfilter-objs := core.o nf_log.o nf_queue.o nf_sockopt.o
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nf_conntrack-y := nf_conntrack_core.o nf_conntrack_standalone.o nf_conntrack_expect.o nf_conntrack_helper.o nf_conntrack_l3proto_generic.o nf_conntrack_proto_generic.o nf_conntrack_proto_tcp.o nf_conntrack_proto_udp.o
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nf_conntrack-y := nf_conntrack_core.o nf_conntrack_standalone.o nf_conntrack_expect.o nf_conntrack_helper.o nf_conntrack_proto.o nf_conntrack_l3proto_generic.o nf_conntrack_proto_generic.o nf_conntrack_proto_tcp.o nf_conntrack_proto_udp.o
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nf_conntrack-$(CONFIG_NF_CONNTRACK_EVENTS) += nf_conntrack_ecache.o
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obj-$(CONFIG_NETFILTER) = netfilter.o
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@ -73,8 +73,6 @@ DEFINE_RWLOCK(nf_conntrack_lock);
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atomic_t nf_conntrack_count = ATOMIC_INIT(0);
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void (*nf_conntrack_destroyed)(struct nf_conn *conntrack) = NULL;
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struct nf_conntrack_protocol **nf_ct_protos[PF_MAX] __read_mostly;
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struct nf_conntrack_l3proto *nf_ct_l3protos[PF_MAX] __read_mostly;
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unsigned int nf_conntrack_htable_size __read_mostly = 0;
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int nf_conntrack_max __read_mostly;
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struct list_head *nf_conntrack_hash __read_mostly;
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@ -115,85 +113,6 @@ DEFINE_RWLOCK(nf_ct_cache_lock);
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/* This avoids calling kmem_cache_create() with same name simultaneously */
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static DEFINE_MUTEX(nf_ct_cache_mutex);
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extern struct nf_conntrack_protocol nf_conntrack_generic_protocol;
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struct nf_conntrack_protocol *
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__nf_ct_proto_find(u_int16_t l3proto, u_int8_t protocol)
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{
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if (unlikely(l3proto >= AF_MAX || nf_ct_protos[l3proto] == NULL))
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return &nf_conntrack_generic_protocol;
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return nf_ct_protos[l3proto][protocol];
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}
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/* this is guaranteed to always return a valid protocol helper, since
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* it falls back to generic_protocol */
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struct nf_conntrack_protocol *
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nf_ct_proto_find_get(u_int16_t l3proto, u_int8_t protocol)
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{
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struct nf_conntrack_protocol *p;
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preempt_disable();
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p = __nf_ct_proto_find(l3proto, protocol);
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if (!try_module_get(p->me))
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p = &nf_conntrack_generic_protocol;
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preempt_enable();
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return p;
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}
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void nf_ct_proto_put(struct nf_conntrack_protocol *p)
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{
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module_put(p->me);
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}
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struct nf_conntrack_l3proto *
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nf_ct_l3proto_find_get(u_int16_t l3proto)
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{
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struct nf_conntrack_l3proto *p;
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preempt_disable();
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p = __nf_ct_l3proto_find(l3proto);
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if (!try_module_get(p->me))
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p = &nf_conntrack_generic_l3proto;
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preempt_enable();
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return p;
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}
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void nf_ct_l3proto_put(struct nf_conntrack_l3proto *p)
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{
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module_put(p->me);
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}
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int
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nf_ct_l3proto_try_module_get(unsigned short l3proto)
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{
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int ret;
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struct nf_conntrack_l3proto *p;
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retry: p = nf_ct_l3proto_find_get(l3proto);
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if (p == &nf_conntrack_generic_l3proto) {
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ret = request_module("nf_conntrack-%d", l3proto);
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if (!ret)
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goto retry;
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return -EPROTOTYPE;
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}
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return 0;
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}
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void nf_ct_l3proto_module_put(unsigned short l3proto)
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{
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struct nf_conntrack_l3proto *p;
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preempt_disable();
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p = __nf_ct_l3proto_find(l3proto);
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preempt_enable();
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module_put(p->me);
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}
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static int nf_conntrack_hash_rnd_initted;
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static unsigned int nf_conntrack_hash_rnd;
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@ -0,0 +1,225 @@
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/* L3/L4 protocol support for nf_conntrack. */
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/* (C) 1999-2001 Paul `Rusty' Russell
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* (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org>
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* (C) 2003,2004 USAGI/WIDE Project <http://www.linux-ipv6.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/types.h>
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#include <linux/netfilter.h>
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#include <linux/module.h>
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#include <linux/skbuff.h>
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#include <linux/vmalloc.h>
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#include <linux/stddef.h>
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#include <linux/err.h>
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#include <linux/percpu.h>
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#include <linux/moduleparam.h>
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#include <linux/notifier.h>
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#include <linux/kernel.h>
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#include <linux/netdevice.h>
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#include <net/netfilter/nf_conntrack.h>
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#include <net/netfilter/nf_conntrack_l3proto.h>
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#include <net/netfilter/nf_conntrack_protocol.h>
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#include <net/netfilter/nf_conntrack_core.h>
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struct nf_conntrack_protocol **nf_ct_protos[PF_MAX] __read_mostly;
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struct nf_conntrack_l3proto *nf_ct_l3protos[PF_MAX] __read_mostly;
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struct nf_conntrack_protocol *
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__nf_ct_proto_find(u_int16_t l3proto, u_int8_t protocol)
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{
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if (unlikely(l3proto >= AF_MAX || nf_ct_protos[l3proto] == NULL))
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return &nf_conntrack_generic_protocol;
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return nf_ct_protos[l3proto][protocol];
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}
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/* this is guaranteed to always return a valid protocol helper, since
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* it falls back to generic_protocol */
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struct nf_conntrack_protocol *
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nf_ct_proto_find_get(u_int16_t l3proto, u_int8_t protocol)
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{
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struct nf_conntrack_protocol *p;
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preempt_disable();
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p = __nf_ct_proto_find(l3proto, protocol);
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if (!try_module_get(p->me))
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p = &nf_conntrack_generic_protocol;
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preempt_enable();
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return p;
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}
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void nf_ct_proto_put(struct nf_conntrack_protocol *p)
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{
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module_put(p->me);
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}
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struct nf_conntrack_l3proto *
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nf_ct_l3proto_find_get(u_int16_t l3proto)
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{
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struct nf_conntrack_l3proto *p;
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preempt_disable();
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p = __nf_ct_l3proto_find(l3proto);
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if (!try_module_get(p->me))
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p = &nf_conntrack_generic_l3proto;
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preempt_enable();
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return p;
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}
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void nf_ct_l3proto_put(struct nf_conntrack_l3proto *p)
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{
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module_put(p->me);
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}
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int
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nf_ct_l3proto_try_module_get(unsigned short l3proto)
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{
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int ret;
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struct nf_conntrack_l3proto *p;
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retry: p = nf_ct_l3proto_find_get(l3proto);
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if (p == &nf_conntrack_generic_l3proto) {
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ret = request_module("nf_conntrack-%d", l3proto);
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if (!ret)
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goto retry;
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return -EPROTOTYPE;
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}
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return 0;
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}
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void nf_ct_l3proto_module_put(unsigned short l3proto)
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{
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struct nf_conntrack_l3proto *p;
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preempt_disable();
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p = __nf_ct_l3proto_find(l3proto);
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preempt_enable();
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module_put(p->me);
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}
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static int kill_l3proto(struct nf_conn *i, void *data)
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{
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return (i->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num ==
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((struct nf_conntrack_l3proto *)data)->l3proto);
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}
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static int kill_proto(struct nf_conn *i, void *data)
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{
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struct nf_conntrack_protocol *proto;
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proto = (struct nf_conntrack_protocol *)data;
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return (i->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum ==
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proto->proto) &&
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(i->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num ==
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proto->l3proto);
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}
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int nf_conntrack_l3proto_register(struct nf_conntrack_l3proto *proto)
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{
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int ret = 0;
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write_lock_bh(&nf_conntrack_lock);
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if (nf_ct_l3protos[proto->l3proto] != &nf_conntrack_generic_l3proto) {
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ret = -EBUSY;
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goto out;
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}
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nf_ct_l3protos[proto->l3proto] = proto;
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out:
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write_unlock_bh(&nf_conntrack_lock);
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return ret;
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}
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void nf_conntrack_l3proto_unregister(struct nf_conntrack_l3proto *proto)
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{
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write_lock_bh(&nf_conntrack_lock);
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nf_ct_l3protos[proto->l3proto] = &nf_conntrack_generic_l3proto;
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write_unlock_bh(&nf_conntrack_lock);
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/* Somebody could be still looking at the proto in bh. */
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synchronize_net();
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/* Remove all contrack entries for this protocol */
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nf_ct_iterate_cleanup(kill_l3proto, proto);
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}
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/* FIXME: Allow NULL functions and sub in pointers to generic for
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them. --RR */
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int nf_conntrack_protocol_register(struct nf_conntrack_protocol *proto)
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{
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int ret = 0;
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retry:
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write_lock_bh(&nf_conntrack_lock);
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if (nf_ct_protos[proto->l3proto]) {
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if (nf_ct_protos[proto->l3proto][proto->proto]
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!= &nf_conntrack_generic_protocol) {
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ret = -EBUSY;
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goto out_unlock;
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}
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} else {
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/* l3proto may be loaded latter. */
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struct nf_conntrack_protocol **proto_array;
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int i;
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write_unlock_bh(&nf_conntrack_lock);
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proto_array = (struct nf_conntrack_protocol **)
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kmalloc(MAX_NF_CT_PROTO *
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sizeof(struct nf_conntrack_protocol *),
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GFP_KERNEL);
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if (proto_array == NULL) {
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ret = -ENOMEM;
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goto out;
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}
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for (i = 0; i < MAX_NF_CT_PROTO; i++)
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proto_array[i] = &nf_conntrack_generic_protocol;
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write_lock_bh(&nf_conntrack_lock);
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if (nf_ct_protos[proto->l3proto]) {
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/* bad timing, but no problem */
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write_unlock_bh(&nf_conntrack_lock);
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kfree(proto_array);
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} else {
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nf_ct_protos[proto->l3proto] = proto_array;
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write_unlock_bh(&nf_conntrack_lock);
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}
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/*
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* Just once because array is never freed until unloading
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* nf_conntrack.ko
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*/
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goto retry;
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}
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nf_ct_protos[proto->l3proto][proto->proto] = proto;
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out_unlock:
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write_unlock_bh(&nf_conntrack_lock);
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out:
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return ret;
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}
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void nf_conntrack_protocol_unregister(struct nf_conntrack_protocol *proto)
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{
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write_lock_bh(&nf_conntrack_lock);
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nf_ct_protos[proto->l3proto][proto->proto]
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= &nf_conntrack_generic_protocol;
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write_unlock_bh(&nf_conntrack_lock);
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/* Somebody could be still looking at the proto in bh. */
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synchronize_net();
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/* Remove all contrack entries for this protocol */
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nf_ct_iterate_cleanup(kill_proto, proto);
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}
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@ -50,22 +50,6 @@ MODULE_LICENSE("GPL");
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extern atomic_t nf_conntrack_count;
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DECLARE_PER_CPU(struct ip_conntrack_stat, nf_conntrack_stat);
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static int kill_l3proto(struct nf_conn *i, void *data)
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{
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return (i->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num ==
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((struct nf_conntrack_l3proto *)data)->l3proto);
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}
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static int kill_proto(struct nf_conn *i, void *data)
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{
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struct nf_conntrack_protocol *proto;
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proto = (struct nf_conntrack_protocol *)data;
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return (i->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum ==
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proto->proto) &&
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(i->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num ==
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proto->l3proto);
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}
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#ifdef CONFIG_PROC_FS
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int
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print_tuple(struct seq_file *s, const struct nf_conntrack_tuple *tuple,
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@ -585,106 +569,6 @@ static ctl_table nf_ct_net_table[] = {
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EXPORT_SYMBOL(nf_ct_log_invalid);
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#endif /* CONFIG_SYSCTL */
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int nf_conntrack_l3proto_register(struct nf_conntrack_l3proto *proto)
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{
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int ret = 0;
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write_lock_bh(&nf_conntrack_lock);
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if (nf_ct_l3protos[proto->l3proto] != &nf_conntrack_generic_l3proto) {
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ret = -EBUSY;
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goto out;
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}
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nf_ct_l3protos[proto->l3proto] = proto;
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out:
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write_unlock_bh(&nf_conntrack_lock);
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return ret;
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}
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void nf_conntrack_l3proto_unregister(struct nf_conntrack_l3proto *proto)
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{
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write_lock_bh(&nf_conntrack_lock);
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nf_ct_l3protos[proto->l3proto] = &nf_conntrack_generic_l3proto;
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write_unlock_bh(&nf_conntrack_lock);
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/* Somebody could be still looking at the proto in bh. */
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synchronize_net();
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/* Remove all contrack entries for this protocol */
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nf_ct_iterate_cleanup(kill_l3proto, proto);
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}
|
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|
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/* FIXME: Allow NULL functions and sub in pointers to generic for
|
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them. --RR */
|
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int nf_conntrack_protocol_register(struct nf_conntrack_protocol *proto)
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{
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int ret = 0;
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retry:
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write_lock_bh(&nf_conntrack_lock);
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if (nf_ct_protos[proto->l3proto]) {
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if (nf_ct_protos[proto->l3proto][proto->proto]
|
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!= &nf_conntrack_generic_protocol) {
|
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ret = -EBUSY;
|
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goto out_unlock;
|
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}
|
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} else {
|
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/* l3proto may be loaded latter. */
|
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struct nf_conntrack_protocol **proto_array;
|
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int i;
|
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|
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write_unlock_bh(&nf_conntrack_lock);
|
||||
|
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proto_array = (struct nf_conntrack_protocol **)
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kmalloc(MAX_NF_CT_PROTO *
|
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sizeof(struct nf_conntrack_protocol *),
|
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GFP_KERNEL);
|
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if (proto_array == NULL) {
|
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ret = -ENOMEM;
|
||||
goto out;
|
||||
}
|
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for (i = 0; i < MAX_NF_CT_PROTO; i++)
|
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proto_array[i] = &nf_conntrack_generic_protocol;
|
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|
||||
write_lock_bh(&nf_conntrack_lock);
|
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if (nf_ct_protos[proto->l3proto]) {
|
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/* bad timing, but no problem */
|
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write_unlock_bh(&nf_conntrack_lock);
|
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kfree(proto_array);
|
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} else {
|
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nf_ct_protos[proto->l3proto] = proto_array;
|
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write_unlock_bh(&nf_conntrack_lock);
|
||||
}
|
||||
|
||||
/*
|
||||
* Just once because array is never freed until unloading
|
||||
* nf_conntrack.ko
|
||||
*/
|
||||
goto retry;
|
||||
}
|
||||
|
||||
nf_ct_protos[proto->l3proto][proto->proto] = proto;
|
||||
|
||||
out_unlock:
|
||||
write_unlock_bh(&nf_conntrack_lock);
|
||||
out:
|
||||
return ret;
|
||||
}
|
||||
|
||||
void nf_conntrack_protocol_unregister(struct nf_conntrack_protocol *proto)
|
||||
{
|
||||
write_lock_bh(&nf_conntrack_lock);
|
||||
nf_ct_protos[proto->l3proto][proto->proto]
|
||||
= &nf_conntrack_generic_protocol;
|
||||
write_unlock_bh(&nf_conntrack_lock);
|
||||
|
||||
/* Somebody could be still looking at the proto in bh. */
|
||||
synchronize_net();
|
||||
|
||||
/* Remove all contrack entries for this protocol */
|
||||
nf_ct_iterate_cleanup(kill_proto, proto);
|
||||
}
|
||||
|
||||
static int __init nf_conntrack_standalone_init(void)
|
||||
{
|
||||
#ifdef CONFIG_PROC_FS
|
||||
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|
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