#include <linux/netfilter_ipv4/ip_conntrack_core.h>
#include <linux/netfilter_ipv4/listhelp.h>
-#define IP_CONNTRACK_VERSION "2.2"
+#define IP_CONNTRACK_VERSION "2.3"
#if 0
#define DEBUGP printk
static LIST_HEAD(unconfirmed);
static int ip_conntrack_vmalloc;
+static unsigned int ip_conntrack_next_id = 1;
+static unsigned int ip_conntrack_expect_next_id = 1;
#ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
struct notifier_block *ip_conntrack_chain;
struct notifier_block *ip_conntrack_expect_chain;
DEFINE_PER_CPU(struct ip_conntrack_stat, ip_conntrack_stat);
-void
-ip_conntrack_put(struct ip_conntrack *ct)
-{
- IP_NF_ASSERT(ct);
- nf_conntrack_put(&ct->ct_general);
-}
-
static int ip_conntrack_hash_rnd_initted;
static unsigned int ip_conntrack_hash_rnd;
exp->master->expecting--;
}
+void __ip_ct_expect_unlink_destroy(struct ip_conntrack_expect *exp)
+{
+ unlink_expect(exp);
+ ip_conntrack_expect_put(exp);
+}
+
static void expectation_timed_out(unsigned long ul_expect)
{
struct ip_conntrack_expect *exp = (void *)ul_expect;
ip_conntrack_expect_put(exp);
}
+struct ip_conntrack_expect *
+__ip_conntrack_expect_find(const struct ip_conntrack_tuple *tuple)
+{
+ struct ip_conntrack_expect *i;
+
+ list_for_each_entry(i, &ip_conntrack_expect_list, list) {
+ if (ip_ct_tuple_mask_cmp(tuple, &i->tuple, &i->mask)) {
+ atomic_inc(&i->use);
+ return i;
+ }
+ }
+ return NULL;
+}
+
+/* Just find a expectation corresponding to a tuple. */
+struct ip_conntrack_expect *
+ip_conntrack_expect_find_get(const struct ip_conntrack_tuple *tuple)
+{
+ struct ip_conntrack_expect *i;
+
+ read_lock_bh(&ip_conntrack_lock);
+ i = __ip_conntrack_expect_find(tuple);
+ read_unlock_bh(&ip_conntrack_lock);
+
+ return i;
+}
+
/* If an expectation for this connection is found, it gets delete from
* global list then returned. */
static struct ip_conntrack_expect *
}
/* delete all expectations for this conntrack */
-static void remove_expectations(struct ip_conntrack *ct)
+void ip_ct_remove_expectations(struct ip_conntrack *ct)
{
struct ip_conntrack_expect *i, *tmp;
LIST_DELETE(&ip_conntrack_hash[hr], &ct->tuplehash[IP_CT_DIR_REPLY]);
/* Destroy all pending expectations */
- remove_expectations(ct);
+ ip_ct_remove_expectations(ct);
}
static void
/* To make sure we don't get any weird locking issues here:
* destroy_conntrack() MUST NOT be called with a write lock
* to ip_conntrack_lock!!! -HW */
- proto = ip_ct_find_proto(ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.protonum);
+ proto = __ip_conntrack_proto_find(ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.protonum);
if (proto && proto->destroy)
proto->destroy(ct);
* except TFTP can create an expectation on the first packet,
* before connection is in the list, so we need to clean here,
* too. */
- remove_expectations(ct);
+ ip_ct_remove_expectations(ct);
/* We overload first tuple to link into unconfirmed list. */
if (!is_confirmed(ct)) {
ip_conntrack_put(ct->master);
DEBUGP("destroy_conntrack: returning ct=%p to slab\n", ct);
- kmem_cache_free(ip_conntrack_cachep, ct);
- atomic_dec(&ip_conntrack_count);
+ ip_conntrack_free(ct);
}
static void death_by_timeout(unsigned long ul_conntrack)
&& ip_ct_tuple_equal(tuple, &i->tuple);
}
-static struct ip_conntrack_tuple_hash *
+struct ip_conntrack_tuple_hash *
__ip_conntrack_find(const struct ip_conntrack_tuple *tuple,
const struct ip_conntrack *ignored_conntrack)
{
return h;
}
+static void __ip_conntrack_hash_insert(struct ip_conntrack *ct,
+ unsigned int hash,
+ unsigned int repl_hash)
+{
+ ct->id = ++ip_conntrack_next_id;
+ list_prepend(&ip_conntrack_hash[hash],
+ &ct->tuplehash[IP_CT_DIR_ORIGINAL].list);
+ list_prepend(&ip_conntrack_hash[repl_hash],
+ &ct->tuplehash[IP_CT_DIR_REPLY].list);
+}
+
+void ip_conntrack_hash_insert(struct ip_conntrack *ct)
+{
+ unsigned int hash, repl_hash;
+
+ hash = hash_conntrack(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple);
+ repl_hash = hash_conntrack(&ct->tuplehash[IP_CT_DIR_REPLY].tuple);
+
+ write_lock_bh(&ip_conntrack_lock);
+ __ip_conntrack_hash_insert(ct, hash, repl_hash);
+ write_unlock_bh(&ip_conntrack_lock);
+}
+
/* Confirm a connection given skb; places it in hash table */
int
__ip_conntrack_confirm(struct sk_buff **pskb)
/* Remove from unconfirmed list */
list_del(&ct->tuplehash[IP_CT_DIR_ORIGINAL].list);
- list_prepend(&ip_conntrack_hash[hash],
- &ct->tuplehash[IP_CT_DIR_ORIGINAL]);
- list_prepend(&ip_conntrack_hash[repl_hash],
- &ct->tuplehash[IP_CT_DIR_REPLY]);
+ __ip_conntrack_hash_insert(ct, hash, repl_hash);
/* Timer relative to confirmation time, not original
setting time, otherwise we'd get timer wrap in
weird delay cases. */
return ip_ct_tuple_mask_cmp(rtuple, &i->tuple, &i->mask);
}
-static struct ip_conntrack_helper *ip_ct_find_helper(const struct ip_conntrack_tuple *tuple)
+static struct ip_conntrack_helper *
+__ip_conntrack_helper_find( const struct ip_conntrack_tuple *tuple)
{
return LIST_FIND(&helpers, helper_cmp,
struct ip_conntrack_helper *,
tuple);
}
-/* Allocate a new conntrack: we return -ENOMEM if classification
- failed due to stress. Otherwise it really is unclassifiable. */
-static struct ip_conntrack_tuple_hash *
-init_conntrack(const struct ip_conntrack_tuple *tuple,
- struct ip_conntrack_protocol *protocol,
- struct sk_buff *skb)
+struct ip_conntrack_helper *
+ip_conntrack_helper_find_get( const struct ip_conntrack_tuple *tuple)
+{
+ struct ip_conntrack_helper *helper;
+
+ /* need ip_conntrack_lock to assure that helper exists until
+ * try_module_get() is called */
+ read_lock_bh(&ip_conntrack_lock);
+
+ helper = __ip_conntrack_helper_find(tuple);
+ if (helper) {
+ /* need to increase module usage count to assure helper will
+ * not go away while the caller is e.g. busy putting a
+ * conntrack in the hash that uses the helper */
+ if (!try_module_get(helper->me))
+ helper = NULL;
+ }
+
+ read_unlock_bh(&ip_conntrack_lock);
+
+ return helper;
+}
+
+void ip_conntrack_helper_put(struct ip_conntrack_helper *helper)
+{
+ module_put(helper->me);
+}
+
+struct ip_conntrack_protocol *
+__ip_conntrack_proto_find(u_int8_t protocol)
+{
+ return ip_ct_protos[protocol];
+}
+
+/* this is guaranteed to always return a valid protocol helper, since
+ * it falls back to generic_protocol */
+struct ip_conntrack_protocol *
+ip_conntrack_proto_find_get(u_int8_t protocol)
+{
+ struct ip_conntrack_protocol *p;
+
+ preempt_disable();
+ p = __ip_conntrack_proto_find(protocol);
+ if (p) {
+ if (!try_module_get(p->me))
+ p = &ip_conntrack_generic_protocol;
+ }
+ preempt_enable();
+
+ return p;
+}
+
+void ip_conntrack_proto_put(struct ip_conntrack_protocol *p)
+{
+ module_put(p->me);
+}
+
+struct ip_conntrack *ip_conntrack_alloc(struct ip_conntrack_tuple *orig,
+ struct ip_conntrack_tuple *repl)
{
struct ip_conntrack *conntrack;
- struct ip_conntrack_tuple repl_tuple;
- size_t hash;
- struct ip_conntrack_expect *exp;
if (!ip_conntrack_hash_rnd_initted) {
get_random_bytes(&ip_conntrack_hash_rnd, 4);
ip_conntrack_hash_rnd_initted = 1;
}
- hash = hash_conntrack(tuple);
-
if (ip_conntrack_max
&& atomic_read(&ip_conntrack_count) >= ip_conntrack_max) {
+ unsigned int hash = hash_conntrack(orig);
/* Try dropping from this hash chain. */
if (!early_drop(&ip_conntrack_hash[hash])) {
if (net_ratelimit())
}
}
- if (!ip_ct_invert_tuple(&repl_tuple, tuple, protocol)) {
- DEBUGP("Can't invert tuple.\n");
- return NULL;
- }
-
conntrack = kmem_cache_alloc(ip_conntrack_cachep, GFP_ATOMIC);
if (!conntrack) {
DEBUGP("Can't allocate conntrack.\n");
- return ERR_PTR(-ENOMEM);
+ return NULL;
}
memset(conntrack, 0, sizeof(*conntrack));
atomic_set(&conntrack->ct_general.use, 1);
conntrack->ct_general.destroy = destroy_conntrack;
- conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple = *tuple;
- conntrack->tuplehash[IP_CT_DIR_REPLY].tuple = repl_tuple;
- if (!protocol->new(conntrack, skb)) {
- kmem_cache_free(ip_conntrack_cachep, conntrack);
- return NULL;
- }
+ conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple = *orig;
+ conntrack->tuplehash[IP_CT_DIR_REPLY].tuple = *repl;
/* Don't set timer yet: wait for confirmation */
init_timer(&conntrack->timeout);
conntrack->timeout.data = (unsigned long)conntrack;
conntrack->timeout.function = death_by_timeout;
+ atomic_inc(&ip_conntrack_count);
+
+ return conntrack;
+}
+
+void
+ip_conntrack_free(struct ip_conntrack *conntrack)
+{
+ atomic_dec(&ip_conntrack_count);
+ kmem_cache_free(ip_conntrack_cachep, conntrack);
+}
+
+/* Allocate a new conntrack: we return -ENOMEM if classification
+ * failed due to stress. Otherwise it really is unclassifiable */
+static struct ip_conntrack_tuple_hash *
+init_conntrack(struct ip_conntrack_tuple *tuple,
+ struct ip_conntrack_protocol *protocol,
+ struct sk_buff *skb)
+{
+ struct ip_conntrack *conntrack;
+ struct ip_conntrack_tuple repl_tuple;
+ struct ip_conntrack_expect *exp;
+
+ if (!ip_ct_invert_tuple(&repl_tuple, tuple, protocol)) {
+ DEBUGP("Can't invert tuple.\n");
+ return NULL;
+ }
+
+ if (!(conntrack = ip_conntrack_alloc(tuple, &repl_tuple)))
+ return NULL;
+
+ if (!protocol->new(conntrack, skb)) {
+ ip_conntrack_free(conntrack);
+ return NULL;
+ }
+
write_lock_bh(&ip_conntrack_lock);
exp = find_expectation(tuple);
nf_conntrack_get(&conntrack->master->ct_general);
CONNTRACK_STAT_INC(expect_new);
} else {
- conntrack->helper = ip_ct_find_helper(&repl_tuple);
+ conntrack->helper = __ip_conntrack_helper_find(&repl_tuple);
CONNTRACK_STAT_INC(new);
}
/* Overload tuple linked list to put us in unconfirmed list. */
list_add(&conntrack->tuplehash[IP_CT_DIR_ORIGINAL].list, &unconfirmed);
- atomic_inc(&ip_conntrack_count);
write_unlock_bh(&ip_conntrack_lock);
if (exp) {
}
#endif
- proto = ip_ct_find_proto((*pskb)->nh.iph->protocol);
+ proto = __ip_conntrack_proto_find((*pskb)->nh.iph->protocol);
/* It may be an special packet, error, unclean...
* inverse of the return code tells to the netfilter
const struct ip_conntrack_tuple *orig)
{
return ip_ct_invert_tuple(inverse, orig,
- ip_ct_find_proto(orig->dst.protonum));
+ __ip_conntrack_proto_find(orig->dst.protonum));
}
/* Would two expected things clash? */
exp->timeout.expires = jiffies + exp->master->helper->timeout * HZ;
add_timer(&exp->timeout);
+ exp->id = ++ip_conntrack_expect_next_id;
+ atomic_inc(&exp->use);
CONNTRACK_STAT_INC(expect_create);
}
conntrack->tuplehash[IP_CT_DIR_REPLY].tuple = *newreply;
if (!conntrack->master && conntrack->expecting == 0)
- conntrack->helper = ip_ct_find_helper(newreply);
+ conntrack->helper = __ip_conntrack_helper_find(newreply);
write_unlock_bh(&ip_conntrack_lock);
}
return 0;
}
+struct ip_conntrack_helper *
+__ip_conntrack_helper_find_byname(const char *name)
+{
+ struct ip_conntrack_helper *h;
+
+ list_for_each_entry(h, &helpers, list) {
+ if (!strcmp(h->name, name))
+ return h;
+ }
+
+ return NULL;
+}
+
static inline int unhelp(struct ip_conntrack_tuple_hash *i,
const struct ip_conntrack_helper *me)
{
}
}
+#if defined(CONFIG_IP_NF_CONNTRACK_NETLINK) || \
+ defined(CONFIG_IP_NF_CONNTRACK_NETLINK_MODULE)
+/* Generic function for tcp/udp/sctp/dccp and alike. This needs to be
+ * in ip_conntrack_core, since we don't want the protocols to autoload
+ * or depend on ctnetlink */
+int ip_ct_port_tuple_to_nfattr(struct sk_buff *skb,
+ const struct ip_conntrack_tuple *tuple)
+{
+ NFA_PUT(skb, CTA_PROTO_SRC_PORT, sizeof(u_int16_t),
+ &tuple->src.u.tcp.port);
+ NFA_PUT(skb, CTA_PROTO_DST_PORT, sizeof(u_int16_t),
+ &tuple->dst.u.tcp.port);
+ return 0;
+
+nfattr_failure:
+ return -1;
+}
+
+int ip_ct_port_nfattr_to_tuple(struct nfattr *tb[],
+ struct ip_conntrack_tuple *t)
+{
+ if (!tb[CTA_PROTO_SRC_PORT-1] || !tb[CTA_PROTO_DST_PORT-1])
+ return -EINVAL;
+
+ t->src.u.tcp.port =
+ *(u_int16_t *)NFA_DATA(tb[CTA_PROTO_SRC_PORT-1]);
+ t->dst.u.tcp.port =
+ *(u_int16_t *)NFA_DATA(tb[CTA_PROTO_DST_PORT-1]);
+
+ return 0;
+}
+#endif
+
/* Returns new sk_buff, or NULL */
struct sk_buff *
ip_ct_gather_frags(struct sk_buff *skb, u_int32_t user)
* ip_conntrack_htable_size));
}
-/* Mishearing the voices in his head, our hero wonders how he's
- supposed to kill the mall. */
-void ip_conntrack_cleanup(void)
+void ip_conntrack_flush()
{
- ip_ct_attach = NULL;
/* This makes sure all current packets have passed through
netfilter framework. Roll on, two-stage module
delete... */
synchronize_net();
-
+
i_see_dead_people:
ip_ct_iterate_cleanup(kill_all, NULL);
if (atomic_read(&ip_conntrack_count) != 0) {
/* wait until all references to ip_conntrack_untracked are dropped */
while (atomic_read(&ip_conntrack_untracked.ct_general.use) > 1)
schedule();
+}
+/* Mishearing the voices in his head, our hero wonders how he's
+ supposed to kill the mall. */
+void ip_conntrack_cleanup(void)
+{
+ ip_ct_attach = NULL;
+ ip_conntrack_flush();
kmem_cache_destroy(ip_conntrack_cachep);
kmem_cache_destroy(ip_conntrack_expect_cachep);
free_conntrack_hash();
--- /dev/null
+/* Connection tracking via netlink socket. Allows for user space
+ * protocol helpers and general trouble making from userspace.
+ *
+ * (C) 2001 by Jay Schulist <jschlst@samba.org>
+ * (C) 2002-2005 by Harald Welte <laforge@gnumonks.org>
+ * (C) 2003 by Patrick Mchardy <kaber@trash.net>
+ * (C) 2005 by Pablo Neira Ayuso <pablo@eurodev.net>
+ *
+ * I've reworked this stuff to use attributes instead of conntrack
+ * structures. 5.44 am. I need more tea. --pablo 05/07/11.
+ *
+ * Initial connection tracking via netlink development funded and
+ * generally made possible by Network Robots, Inc. (www.networkrobots.com)
+ *
+ * Further development of this code funded by Astaro AG (http://www.astaro.com)
+ *
+ * This software may be used and distributed according to the terms
+ * of the GNU General Public License, incorporated herein by reference.
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/timer.h>
+#include <linux/skbuff.h>
+#include <linux/errno.h>
+#include <linux/netlink.h>
+#include <linux/spinlock.h>
+#include <linux/notifier.h>
+#include <linux/rtnetlink.h>
+
+#include <linux/netfilter.h>
+#include <linux/netfilter_ipv4.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv4/ip_conntrack.h>
+#include <linux/netfilter_ipv4/ip_conntrack_core.h>
+#include <linux/netfilter_ipv4/ip_conntrack_helper.h>
+#include <linux/netfilter_ipv4/ip_conntrack_protocol.h>
+#include <linux/netfilter_ipv4/ip_nat_protocol.h>
+
+#include <linux/netfilter/nfnetlink.h>
+#include <linux/netfilter/nfnetlink_conntrack.h>
+
+MODULE_LICENSE("GPL");
+
+static char __initdata version[] = "0.90";
+
+#if 0
+#define DEBUGP printk
+#else
+#define DEBUGP(format, args...)
+#endif
+
+
+static inline int
+ctnetlink_dump_tuples_proto(struct sk_buff *skb,
+ const struct ip_conntrack_tuple *tuple)
+{
+ struct ip_conntrack_protocol *proto;
+
+ NFA_PUT(skb, CTA_PROTO_NUM, sizeof(u_int8_t), &tuple->dst.protonum);
+
+ proto = ip_conntrack_proto_find_get(tuple->dst.protonum);
+ if (proto && proto->tuple_to_nfattr)
+ return proto->tuple_to_nfattr(skb, tuple);
+
+ return 0;
+
+nfattr_failure:
+ return -1;
+}
+
+static inline int
+ctnetlink_dump_tuples(struct sk_buff *skb,
+ const struct ip_conntrack_tuple *tuple)
+{
+ struct nfattr *nest_parms;
+
+ nest_parms = NFA_NEST(skb, CTA_TUPLE_IP);
+ NFA_PUT(skb, CTA_IP_V4_SRC, sizeof(u_int32_t), &tuple->src.ip);
+ NFA_PUT(skb, CTA_IP_V4_DST, sizeof(u_int32_t), &tuple->dst.ip);
+ NFA_NEST_END(skb, nest_parms);
+
+ nest_parms = NFA_NEST(skb, CTA_TUPLE_PROTO);
+ ctnetlink_dump_tuples_proto(skb, tuple);
+ NFA_NEST_END(skb, nest_parms);
+
+ return 0;
+
+nfattr_failure:
+ return -1;
+}
+
+static inline int
+ctnetlink_dump_status(struct sk_buff *skb, const struct ip_conntrack *ct)
+{
+ u_int32_t status = htonl((u_int32_t) ct->status);
+ NFA_PUT(skb, CTA_STATUS, sizeof(status), &status);
+ return 0;
+
+nfattr_failure:
+ return -1;
+}
+
+static inline int
+ctnetlink_dump_timeout(struct sk_buff *skb, const struct ip_conntrack *ct)
+{
+ long timeout_l = ct->timeout.expires - jiffies;
+ u_int32_t timeout;
+
+ if (timeout_l < 0)
+ timeout = 0;
+ else
+ timeout = htonl(timeout_l / HZ);
+
+ NFA_PUT(skb, CTA_TIMEOUT, sizeof(timeout), &timeout);
+ return 0;
+
+nfattr_failure:
+ return -1;
+}
+
+static inline int
+ctnetlink_dump_protoinfo(struct sk_buff *skb, const struct ip_conntrack *ct)
+{
+ struct ip_conntrack_protocol *proto = ip_conntrack_proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
+
+ struct nfattr *nest_proto;
+ int ret;
+
+ if (!proto || !proto->to_nfattr)
+ return 0;
+
+ nest_proto = NFA_NEST(skb, CTA_PROTOINFO);
+
+ ret = proto->to_nfattr(skb, nest_proto, ct);
+
+ ip_conntrack_proto_put(proto);
+
+ NFA_NEST_END(skb, nest_proto);
+
+ return ret;
+
+nfattr_failure:
+ return -1;
+}
+
+static inline int
+ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct ip_conntrack *ct)
+{
+ struct nfattr *nest_helper;
+
+ if (!ct->helper)
+ return 0;
+
+ nest_helper = NFA_NEST(skb, CTA_HELP);
+ NFA_PUT(skb, CTA_HELP_NAME, CTA_HELP_MAXNAMESIZE, &ct->helper->name);
+
+ if (ct->helper->to_nfattr)
+ ct->helper->to_nfattr(skb, ct);
+
+ NFA_NEST_END(skb, nest_helper);
+
+ return 0;
+
+nfattr_failure:
+ return -1;
+}
+
+#ifdef CONFIG_IP_NF_CT_ACCT
+static inline int
+ctnetlink_dump_counters(struct sk_buff *skb, const struct ip_conntrack *ct,
+ enum ip_conntrack_dir dir)
+{
+ enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
+ struct nfattr *nest_count = NFA_NEST(skb, type);
+ u_int64_t tmp;
+
+ tmp = cpu_to_be64(ct->counters[dir].packets);
+ NFA_PUT(skb, CTA_COUNTERS_PACKETS, sizeof(u_int64_t), &tmp);
+
+ tmp = cpu_to_be64(ct->counters[dir].bytes);
+ NFA_PUT(skb, CTA_COUNTERS_BYTES, sizeof(u_int64_t), &tmp);
+
+ NFA_NEST_END(skb, nest_count);
+
+ return 0;
+
+nfattr_failure:
+ return -1;
+}
+#else
+#define ctnetlink_dump_counters(a, b, c) (0)
+#endif
+
+#ifdef CONFIG_IP_NF_CONNTRACK_MARK
+static inline int
+ctnetlink_dump_mark(struct sk_buff *skb, const struct ip_conntrack *ct)
+{
+ u_int32_t mark = htonl(ct->mark);
+
+ NFA_PUT(skb, CTA_MARK, sizeof(u_int32_t), &mark);
+ return 0;
+
+nfattr_failure:
+ return -1;
+}
+#else
+#define ctnetlink_dump_mark(a, b) (0)
+#endif
+
+static inline int
+ctnetlink_dump_id(struct sk_buff *skb, const struct ip_conntrack *ct)
+{
+ u_int32_t id = htonl(ct->id);
+ NFA_PUT(skb, CTA_ID, sizeof(u_int32_t), &id);
+ return 0;
+
+nfattr_failure:
+ return -1;
+}
+
+static inline int
+ctnetlink_dump_use(struct sk_buff *skb, const struct ip_conntrack *ct)
+{
+ unsigned int use = htonl(atomic_read(&ct->ct_general.use));
+
+ NFA_PUT(skb, CTA_USE, sizeof(u_int32_t), &use);
+ return 0;
+
+nfattr_failure:
+ return -1;
+}
+
+#define tuple(ct, dir) (&(ct)->tuplehash[dir].tuple)
+
+static int
+ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
+ int event, int nowait,
+ const struct ip_conntrack *ct)
+{
+ struct nlmsghdr *nlh;
+ struct nfgenmsg *nfmsg;
+ struct nfattr *nest_parms;
+ unsigned char *b;
+
+ b = skb->tail;
+
+ event |= NFNL_SUBSYS_CTNETLINK << 8;
+ nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
+ nfmsg = NLMSG_DATA(nlh);
+
+ nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0;
+ nfmsg->nfgen_family = AF_INET;
+ nfmsg->version = NFNETLINK_V0;
+ nfmsg->res_id = 0;
+
+ nest_parms = NFA_NEST(skb, CTA_TUPLE_ORIG);
+ if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
+ goto nfattr_failure;
+ NFA_NEST_END(skb, nest_parms);
+
+ nest_parms = NFA_NEST(skb, CTA_TUPLE_REPLY);
+ if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
+ goto nfattr_failure;
+ NFA_NEST_END(skb, nest_parms);
+
+ if (ctnetlink_dump_status(skb, ct) < 0 ||
+ ctnetlink_dump_timeout(skb, ct) < 0 ||
+ ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
+ ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
+ ctnetlink_dump_protoinfo(skb, ct) < 0 ||
+ ctnetlink_dump_helpinfo(skb, ct) < 0 ||
+ ctnetlink_dump_mark(skb, ct) < 0 ||
+ ctnetlink_dump_id(skb, ct) < 0 ||
+ ctnetlink_dump_use(skb, ct) < 0)
+ goto nfattr_failure;
+
+ nlh->nlmsg_len = skb->tail - b;
+ return skb->len;
+
+nlmsg_failure:
+nfattr_failure:
+ skb_trim(skb, b - skb->data);
+ return -1;
+}
+
+#ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
+static int ctnetlink_conntrack_event(struct notifier_block *this,
+ unsigned long events, void *ptr)
+{
+ struct nlmsghdr *nlh;
+ struct nfgenmsg *nfmsg;
+ struct nfattr *nest_parms;
+ struct ip_conntrack *ct = (struct ip_conntrack *)ptr;
+ struct sk_buff *skb;
+ unsigned int type;
+ unsigned char *b;
+ unsigned int flags = 0, groups;
+
+ /* ignore our fake conntrack entry */
+ if (ct == &ip_conntrack_untracked)
+ return NOTIFY_DONE;
+
+ if (events & IPCT_DESTROY) {
+ type = IPCTNL_MSG_CT_DELETE;
+ groups = NF_NETLINK_CONNTRACK_DESTROY;
+ goto alloc_skb;
+ }
+ if (events & (IPCT_NEW | IPCT_RELATED)) {
+ type = IPCTNL_MSG_CT_NEW;
+ flags = NLM_F_CREATE|NLM_F_EXCL;
+ /* dump everything */
+ events = ~0UL;
+ groups = NF_NETLINK_CONNTRACK_NEW;
+ goto alloc_skb;
+ }
+ if (events & (IPCT_STATUS |
+ IPCT_PROTOINFO |
+ IPCT_HELPER |
+ IPCT_HELPINFO |
+ IPCT_NATINFO)) {
+ type = IPCTNL_MSG_CT_NEW;
+ groups = NF_NETLINK_CONNTRACK_UPDATE;
+ goto alloc_skb;
+ }
+
+ return NOTIFY_DONE;
+
+alloc_skb:
+ /* FIXME: Check if there are any listeners before, don't hurt performance */
+
+ skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
+ if (!skb)
+ return NOTIFY_DONE;
+
+ b = skb->tail;
+
+ type |= NFNL_SUBSYS_CTNETLINK << 8;
+ nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
+ nfmsg = NLMSG_DATA(nlh);
+
+ nlh->nlmsg_flags = flags;
+ nfmsg->nfgen_family = AF_INET;
+ nfmsg->version = NFNETLINK_V0;
+ nfmsg->res_id = 0;
+
+ nest_parms = NFA_NEST(skb, CTA_TUPLE_ORIG);
+ if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
+ goto nfattr_failure;
+ NFA_NEST_END(skb, nest_parms);
+
+ nest_parms = NFA_NEST(skb, CTA_TUPLE_REPLY);
+ if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
+ goto nfattr_failure;
+ NFA_NEST_END(skb, nest_parms);
+
+ /* NAT stuff is now a status flag */
+ if ((events & IPCT_STATUS || events & IPCT_NATINFO)
+ && ctnetlink_dump_status(skb, ct) < 0)
+ goto nfattr_failure;
+ if (events & IPCT_REFRESH
+ && ctnetlink_dump_timeout(skb, ct) < 0)
+ goto nfattr_failure;
+ if (events & IPCT_PROTOINFO
+ && ctnetlink_dump_protoinfo(skb, ct) < 0)
+ goto nfattr_failure;
+ if (events & IPCT_HELPINFO
+ && ctnetlink_dump_helpinfo(skb, ct) < 0)
+ goto nfattr_failure;
+
+ if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
+ ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0)
+ goto nfattr_failure;
+
+ nlh->nlmsg_len = skb->tail - b;
+ nfnetlink_send(skb, 0, groups, 0);
+ return NOTIFY_DONE;
+
+nlmsg_failure:
+nfattr_failure:
+ kfree_skb(skb);
+ return NOTIFY_DONE;
+}
+#endif /* CONFIG_IP_NF_CONNTRACK_EVENTS */
+
+static int ctnetlink_done(struct netlink_callback *cb)
+{
+ DEBUGP("entered %s\n", __FUNCTION__);
+ return 0;
+}
+
+static int
+ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ struct ip_conntrack *ct = NULL;
+ struct ip_conntrack_tuple_hash *h;
+ struct list_head *i;
+ u_int32_t *id = (u_int32_t *) &cb->args[1];
+
+ DEBUGP("entered %s, last bucket=%lu id=%u\n", __FUNCTION__,
+ cb->args[0], *id);
+
+ read_lock_bh(&ip_conntrack_lock);
+ for (; cb->args[0] < ip_conntrack_htable_size; cb->args[0]++, *id = 0) {
+ list_for_each(i, &ip_conntrack_hash[cb->args[0]]) {
+ h = (struct ip_conntrack_tuple_hash *) i;
+ if (DIRECTION(h) != IP_CT_DIR_ORIGINAL)
+ continue;
+ ct = tuplehash_to_ctrack(h);
+ if (ct->id <= *id)
+ continue;
+ if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
+ cb->nlh->nlmsg_seq,
+ IPCTNL_MSG_CT_NEW,
+ 1, ct) < 0)
+ goto out;
+ *id = ct->id;
+ }
+ }
+out:
+ read_unlock_bh(&ip_conntrack_lock);
+
+ DEBUGP("leaving, last bucket=%lu id=%u\n", cb->args[0], *id);
+
+ return skb->len;
+}
+
+#ifdef CONFIG_IP_NF_CT_ACCT
+static int
+ctnetlink_dump_table_w(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ struct ip_conntrack *ct = NULL;
+ struct ip_conntrack_tuple_hash *h;
+ struct list_head *i;
+ u_int32_t *id = (u_int32_t *) &cb->args[1];
+
+ DEBUGP("entered %s, last bucket=%u id=%u\n", __FUNCTION__,
+ cb->args[0], *id);
+
+ write_lock_bh(&ip_conntrack_lock);
+ for (; cb->args[0] < ip_conntrack_htable_size; cb->args[0]++, *id = 0) {
+ list_for_each(i, &ip_conntrack_hash[cb->args[0]]) {
+ h = (struct ip_conntrack_tuple_hash *) i;
+ if (DIRECTION(h) != IP_CT_DIR_ORIGINAL)
+ continue;
+ ct = tuplehash_to_ctrack(h);
+ if (ct->id <= *id)
+ continue;
+ if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
+ cb->nlh->nlmsg_seq,
+ IPCTNL_MSG_CT_NEW,
+ 1, ct) < 0)
+ goto out;
+ *id = ct->id;
+
+ memset(&ct->counters, 0, sizeof(ct->counters));
+ }
+ }
+out:
+ write_unlock_bh(&ip_conntrack_lock);
+
+ DEBUGP("leaving, last bucket=%lu id=%u\n", cb->args[0], *id);
+
+ return skb->len;
+}
+#endif
+
+static const int cta_min_ip[CTA_IP_MAX] = {
+ [CTA_IP_V4_SRC-1] = sizeof(u_int32_t),
+ [CTA_IP_V4_DST-1] = sizeof(u_int32_t),
+};
+
+static inline int
+ctnetlink_parse_tuple_ip(struct nfattr *attr, struct ip_conntrack_tuple *tuple)
+{
+ struct nfattr *tb[CTA_IP_MAX];
+
+ DEBUGP("entered %s\n", __FUNCTION__);
+
+ memset(tb, 0, CTA_IP_MAX * sizeof(tb));
+
+ if (nfattr_parse_nested(tb, CTA_IP_MAX, attr) < 0)
+ goto nfattr_failure;
+
+ if (nfattr_bad_size(tb, CTA_IP_MAX, cta_min_ip))
+ return -EINVAL;
+
+ if (!tb[CTA_IP_V4_SRC-1])
+ return -EINVAL;
+ tuple->src.ip = *(u_int32_t *)NFA_DATA(tb[CTA_IP_V4_SRC-1]);
+
+ if (!tb[CTA_IP_V4_DST-1])
+ return -EINVAL;
+ tuple->dst.ip = *(u_int32_t *)NFA_DATA(tb[CTA_IP_V4_DST-1]);
+
+ DEBUGP("leaving\n");
+
+ return 0;
+
+nfattr_failure:
+ return -1;
+}
+
+static const int cta_min_proto[CTA_PROTO_MAX] = {
+ [CTA_PROTO_NUM-1] = sizeof(u_int16_t),
+ [CTA_PROTO_SRC_PORT-1] = sizeof(u_int16_t),
+ [CTA_PROTO_DST_PORT-1] = sizeof(u_int16_t),
+ [CTA_PROTO_ICMP_TYPE-1] = sizeof(u_int8_t),
+ [CTA_PROTO_ICMP_CODE-1] = sizeof(u_int8_t),
+ [CTA_PROTO_ICMP_ID-1] = sizeof(u_int16_t),
+};
+
+static inline int
+ctnetlink_parse_tuple_proto(struct nfattr *attr,
+ struct ip_conntrack_tuple *tuple)
+{
+ struct nfattr *tb[CTA_PROTO_MAX];
+ struct ip_conntrack_protocol *proto;
+ int ret = 0;
+
+ DEBUGP("entered %s\n", __FUNCTION__);
+
+ memset(tb, 0, CTA_PROTO_MAX * sizeof(tb));
+
+ if (nfattr_parse_nested(tb, CTA_PROTO_MAX, attr) < 0)
+ goto nfattr_failure;
+
+ if (nfattr_bad_size(tb, CTA_PROTO_MAX, cta_min_proto))
+ return -EINVAL;
+
+ if (!tb[CTA_PROTO_NUM-1])
+ return -EINVAL;
+ tuple->dst.protonum = *(u_int16_t *)NFA_DATA(tb[CTA_PROTO_NUM-1]);
+
+ proto = ip_conntrack_proto_find_get(tuple->dst.protonum);
+
+ if (likely(proto && proto->nfattr_to_tuple)) {
+ ret = proto->nfattr_to_tuple(tb, tuple);
+ ip_conntrack_proto_put(proto);
+ }
+
+ return ret;
+
+nfattr_failure:
+ return -1;
+}
+
+static inline int
+ctnetlink_parse_tuple(struct nfattr *cda[], struct ip_conntrack_tuple *tuple,
+ enum ctattr_tuple type)
+{
+ struct nfattr *tb[CTA_TUPLE_MAX];
+ int err;
+
+ DEBUGP("entered %s\n", __FUNCTION__);
+
+ memset(tb, 0, CTA_TUPLE_MAX * sizeof(tb));
+ memset(tuple, 0, sizeof(*tuple));
+
+ if (nfattr_parse_nested(tb, CTA_TUPLE_MAX, cda[type-1]) < 0)
+ goto nfattr_failure;
+
+ if (!tb[CTA_TUPLE_IP-1])
+ return -EINVAL;
+
+ err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP-1], tuple);
+ if (err < 0)
+ return err;
+
+ if (!tb[CTA_TUPLE_PROTO-1])
+ return -EINVAL;
+
+ err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO-1], tuple);
+ if (err < 0)
+ return err;
+
+ /* orig and expect tuples get DIR_ORIGINAL */
+ if (type == CTA_TUPLE_REPLY)
+ tuple->dst.dir = IP_CT_DIR_REPLY;
+ else
+ tuple->dst.dir = IP_CT_DIR_ORIGINAL;
+
+ DUMP_TUPLE(tuple);
+
+ DEBUGP("leaving\n");
+
+ return 0;
+
+nfattr_failure:
+ return -1;
+}
+
+#ifdef CONFIG_IP_NF_NAT_NEEDED
+static const int cta_min_protonat[CTA_PROTONAT_MAX] = {
+ [CTA_PROTONAT_PORT_MIN-1] = sizeof(u_int16_t),
+ [CTA_PROTONAT_PORT_MAX-1] = sizeof(u_int16_t),
+};
+
+static int ctnetlink_parse_nat_proto(struct nfattr *attr,
+ const struct ip_conntrack *ct,
+ struct ip_nat_range *range)
+{
+ struct nfattr *tb[CTA_PROTONAT_MAX];
+ struct ip_nat_protocol *npt;
+
+ DEBUGP("entered %s\n", __FUNCTION__);
+
+ memset(tb, 0, CTA_PROTONAT_MAX * sizeof(tb));
+
+ if (nfattr_parse_nested(tb, CTA_PROTONAT_MAX, attr) < 0)
+ goto nfattr_failure;
+
+ if (nfattr_bad_size(tb, CTA_PROTONAT_MAX, cta_min_protonat))
+ goto nfattr_failure;
+
+ npt = ip_nat_proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
+ if (!npt)
+ return 0;
+
+ if (!npt->nfattr_to_range) {
+ ip_nat_proto_put(npt);
+ return 0;
+ }
+
+ /* nfattr_to_range returns 1 if it parsed, 0 if not, neg. on error */
+ if (npt->nfattr_to_range(tb, range) > 0)
+ range->flags |= IP_NAT_RANGE_PROTO_SPECIFIED;
+
+ ip_nat_proto_put(npt);
+
+ DEBUGP("leaving\n");
+ return 0;
+
+nfattr_failure:
+ return -1;
+}
+
+static inline int
+ctnetlink_parse_nat(struct nfattr *cda[],
+ const struct ip_conntrack *ct, struct ip_nat_range *range)
+{
+ struct nfattr *tb[CTA_NAT_MAX];
+ int err;
+
+ DEBUGP("entered %s\n", __FUNCTION__);
+
+ memset(tb, 0, CTA_NAT_MAX * sizeof(tb));
+ memset(range, 0, sizeof(*range));
+
+ if (nfattr_parse_nested(tb, CTA_NAT_MAX, cda[CTA_NAT-1]) < 0)
+ goto nfattr_failure;
+
+ if (tb[CTA_NAT_MINIP-1])
+ range->min_ip = *(u_int32_t *)NFA_DATA(tb[CTA_NAT_MINIP-1]);
+
+ if (!tb[CTA_NAT_MAXIP-1])
+ range->max_ip = range->min_ip;
+ else
+ range->max_ip = *(u_int32_t *)NFA_DATA(tb[CTA_NAT_MAXIP-1]);
+
+ if (range->min_ip)
+ range->flags |= IP_NAT_RANGE_MAP_IPS;
+
+ if (!tb[CTA_NAT_PROTO-1])
+ return 0;
+
+ err = ctnetlink_parse_nat_proto(tb[CTA_NAT_PROTO-1], ct, range);
+ if (err < 0)
+ return err;
+
+ DEBUGP("leaving\n");
+ return 0;
+
+nfattr_failure:
+ return -1;
+}
+#endif
+
+static inline int
+ctnetlink_parse_help(struct nfattr *attr, char **helper_name)
+{
+ struct nfattr *tb[CTA_HELP_MAX];
+
+ DEBUGP("entered %s\n", __FUNCTION__);
+ memset(tb, 0, CTA_HELP_MAX * sizeof(tb));
+
+ if (nfattr_parse_nested(tb, CTA_HELP_MAX, attr) < 0)
+ goto nfattr_failure;
+
+ if (!tb[CTA_HELP_NAME-1])
+ return -EINVAL;
+
+ *helper_name = NFA_DATA(tb[CTA_HELP_NAME-1]);
+
+ return 0;
+
+nfattr_failure:
+ return -1;
+}
+
+static int
+ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
+ struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
+{
+ struct ip_conntrack_tuple_hash *h;
+ struct ip_conntrack_tuple tuple;
+ struct ip_conntrack *ct;
+ int err = 0;
+
+ DEBUGP("entered %s\n", __FUNCTION__);
+
+ if (cda[CTA_TUPLE_ORIG-1])
+ err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG);
+ else if (cda[CTA_TUPLE_REPLY-1])
+ err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY);
+ else {
+ /* Flush the whole table */
+ ip_conntrack_flush();
+ return 0;
+ }
+
+ if (err < 0)
+ return err;
+
+ h = ip_conntrack_find_get(&tuple, NULL);
+ if (!h) {
+ DEBUGP("tuple not found in conntrack hash\n");
+ return -ENOENT;
+ }
+
+ ct = tuplehash_to_ctrack(h);
+
+ if (cda[CTA_ID-1]) {
+ u_int32_t id = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_ID-1]));
+ if (ct->id != id) {
+ ip_conntrack_put(ct);
+ return -ENOENT;
+ }
+ }
+ if (del_timer(&ct->timeout)) {
+ ip_conntrack_put(ct);
+ ct->timeout.function((unsigned long)ct);
+ return 0;
+ }
+ ip_conntrack_put(ct);
+ DEBUGP("leaving\n");
+
+ return 0;
+}
+
+static int
+ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
+ struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
+{
+ struct ip_conntrack_tuple_hash *h;
+ struct ip_conntrack_tuple tuple;
+ struct ip_conntrack *ct;
+ struct sk_buff *skb2 = NULL;
+ int err = 0;
+
+ DEBUGP("entered %s\n", __FUNCTION__);
+
+ if (nlh->nlmsg_flags & NLM_F_DUMP) {
+ struct nfgenmsg *msg = NLMSG_DATA(nlh);
+ u32 rlen;
+
+ if (msg->nfgen_family != AF_INET)
+ return -EAFNOSUPPORT;
+
+ if (NFNL_MSG_TYPE(nlh->nlmsg_type) ==
+ IPCTNL_MSG_CT_GET_CTRZERO) {
+#ifdef CONFIG_IP_NF_CT_ACCT
+ if ((*errp = netlink_dump_start(ctnl, skb, nlh,
+ ctnetlink_dump_table_w,
+ ctnetlink_done)) != 0)
+ return -EINVAL;
+#else
+ return -ENOTSUPP;
+#endif
+ } else {
+ if ((*errp = netlink_dump_start(ctnl, skb, nlh,
+ ctnetlink_dump_table,
+ ctnetlink_done)) != 0)
+ return -EINVAL;
+ }
+
+ rlen = NLMSG_ALIGN(nlh->nlmsg_len);
+ if (rlen > skb->len)
+ rlen = skb->len;
+ skb_pull(skb, rlen);
+ return 0;
+ }
+
+ if (cda[CTA_TUPLE_ORIG-1])
+ err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG);
+ else if (cda[CTA_TUPLE_REPLY-1])
+ err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY);
+ else
+ return -EINVAL;
+
+ if (err < 0)
+ return err;
+
+ h = ip_conntrack_find_get(&tuple, NULL);
+ if (!h) {
+ DEBUGP("tuple not found in conntrack hash");
+ return -ENOENT;
+ }
+ DEBUGP("tuple found\n");
+ ct = tuplehash_to_ctrack(h);
+
+ err = -ENOMEM;
+ skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
+ if (!skb2) {
+ ip_conntrack_put(ct);
+ return -ENOMEM;
+ }
+ NETLINK_CB(skb2).dst_pid = NETLINK_CB(skb).pid;
+
+ err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
+ IPCTNL_MSG_CT_NEW, 1, ct);
+ ip_conntrack_put(ct);
+ if (err <= 0)
+ goto out;
+
+ err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
+ if (err < 0)
+ goto out;
+
+ DEBUGP("leaving\n");
+ return 0;
+
+out:
+ if (skb2)
+ kfree_skb(skb2);
+ return -1;
+}
+
+static inline int
+ctnetlink_change_status(struct ip_conntrack *ct, struct nfattr *cda[])
+{
+ unsigned long d, status = *(u_int32_t *)NFA_DATA(cda[CTA_STATUS-1]);
+ d = ct->status ^ status;
+
+ if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
+ /* unchangeable */
+ return -EINVAL;
+
+ if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
+ /* SEEN_REPLY bit can only be set */
+ return -EINVAL;
+
+
+ if (d & IPS_ASSURED && !(status & IPS_ASSURED))
+ /* ASSURED bit can only be set */
+ return -EINVAL;
+
+ if (cda[CTA_NAT-1]) {
+#ifndef CONFIG_IP_NF_NAT_NEEDED
+ return -EINVAL;
+#else
+ unsigned int hooknum;
+ struct ip_nat_range range;
+
+ if (ctnetlink_parse_nat(cda, ct, &range) < 0)
+ return -EINVAL;
+
+ DEBUGP("NAT: %u.%u.%u.%u-%u.%u.%u.%u:%u-%u\n",
+ NIPQUAD(range.min_ip), NIPQUAD(range.max_ip),
+ htons(range.min.all), htons(range.max.all));
+
+ /* This is tricky but it works. ip_nat_setup_info needs the
+ * hook number as parameter, so let's do the correct
+ * conversion and run away */
+ if (status & IPS_SRC_NAT_DONE)
+ hooknum = NF_IP_POST_ROUTING; /* IP_NAT_MANIP_SRC */
+ else if (status & IPS_DST_NAT_DONE)
+ hooknum = NF_IP_PRE_ROUTING; /* IP_NAT_MANIP_DST */
+ else
+ return -EINVAL; /* Missing NAT flags */
+
+ DEBUGP("NAT status: %lu\n",
+ status & (IPS_NAT_MASK | IPS_NAT_DONE_MASK));
+
+ if (ip_nat_initialized(ct, hooknum))
+ return -EEXIST;
+ ip_nat_setup_info(ct, &range, hooknum);
+
+ DEBUGP("NAT status after setup_info: %lu\n",
+ ct->status & (IPS_NAT_MASK | IPS_NAT_DONE_MASK));
+#endif
+ }
+
+ /* Be careful here, modifying NAT bits can screw up things,
+ * so don't let users modify them directly if they don't pass
+ * ip_nat_range. */
+ ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
+ return 0;
+}
+
+
+static inline int
+ctnetlink_change_helper(struct ip_conntrack *ct, struct nfattr *cda[])
+{
+ struct ip_conntrack_helper *helper;
+ char *helpname;
+ int err;
+
+ DEBUGP("entered %s\n", __FUNCTION__);
+
+ /* don't change helper of sibling connections */
+ if (ct->master)
+ return -EINVAL;
+
+ err = ctnetlink_parse_help(cda[CTA_HELP-1], &helpname);
+ if (err < 0)
+ return err;
+
+ helper = __ip_conntrack_helper_find_byname(helpname);
+ if (!helper) {
+ if (!strcmp(helpname, ""))
+ helper = NULL;
+ else
+ return -EINVAL;
+ }
+
+ if (ct->helper) {
+ if (!helper) {
+ /* we had a helper before ... */
+ ip_ct_remove_expectations(ct);
+ ct->helper = NULL;
+ } else {
+ /* need to zero data of old helper */
+ memset(&ct->help, 0, sizeof(ct->help));
+ }
+ }
+
+ ct->helper = helper;
+
+ return 0;
+}
+
+static inline int
+ctnetlink_change_timeout(struct ip_conntrack *ct, struct nfattr *cda[])
+{
+ u_int32_t timeout = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_TIMEOUT-1]));
+
+ if (!del_timer(&ct->timeout))
+ return -ETIME;
+
+ ct->timeout.expires = jiffies + timeout * HZ;
+ add_timer(&ct->timeout);
+
+ return 0;
+}
+
+static int
+ctnetlink_change_conntrack(struct ip_conntrack *ct, struct nfattr *cda[])
+{
+ int err;
+
+ DEBUGP("entered %s\n", __FUNCTION__);
+
+ if (cda[CTA_HELP-1]) {
+ err = ctnetlink_change_helper(ct, cda);
+ if (err < 0)
+ return err;
+ }
+
+ if (cda[CTA_TIMEOUT-1]) {
+ err = ctnetlink_change_timeout(ct, cda);
+ if (err < 0)
+ return err;
+ }
+
+ if (cda[CTA_STATUS-1]) {
+ err = ctnetlink_change_status(ct, cda);
+ if (err < 0)
+ return err;
+ }
+
+ DEBUGP("all done\n");
+ return 0;
+}
+
+static int
+ctnetlink_create_conntrack(struct nfattr *cda[],
+ struct ip_conntrack_tuple *otuple,
+ struct ip_conntrack_tuple *rtuple)
+{
+ struct ip_conntrack *ct;
+ int err = -EINVAL;
+
+ DEBUGP("entered %s\n", __FUNCTION__);
+
+ ct = ip_conntrack_alloc(otuple, rtuple);
+ if (ct == NULL || IS_ERR(ct))
+ return -ENOMEM;
+
+ if (!cda[CTA_TIMEOUT-1])
+ goto err;
+ ct->timeout.expires = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_TIMEOUT-1]));
+
+ ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
+ ct->status |= IPS_CONFIRMED;
+
+ err = ctnetlink_change_status(ct, cda);
+ if (err < 0)
+ goto err;
+
+ ct->helper = ip_conntrack_helper_find_get(rtuple);
+
+ add_timer(&ct->timeout);
+ ip_conntrack_hash_insert(ct);
+
+ if (ct->helper)
+ ip_conntrack_helper_put(ct->helper);
+
+ DEBUGP("conntrack with id %u inserted\n", ct->id);
+ return 0;
+
+err:
+ ip_conntrack_free(ct);
+ return err;
+}
+
+static int
+ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
+ struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
+{
+ struct ip_conntrack_tuple otuple, rtuple;
+ struct ip_conntrack_tuple_hash *h = NULL;
+ int err = 0;
+
+ DEBUGP("entered %s\n", __FUNCTION__);
+
+ if (cda[CTA_TUPLE_ORIG-1]) {
+ err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG);
+ if (err < 0)
+ return err;
+ }
+
+ if (cda[CTA_TUPLE_REPLY-1]) {
+ err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY);
+ if (err < 0)
+ return err;
+ }
+
+ write_lock_bh(&ip_conntrack_lock);
+ if (cda[CTA_TUPLE_ORIG-1])
+ h = __ip_conntrack_find(&otuple, NULL);
+ else if (cda[CTA_TUPLE_REPLY-1])
+ h = __ip_conntrack_find(&rtuple, NULL);
+
+ if (h == NULL) {
+ write_unlock_bh(&ip_conntrack_lock);
+ DEBUGP("no such conntrack, create new\n");
+ err = -ENOENT;
+ if (nlh->nlmsg_flags & NLM_F_CREATE)
+ err = ctnetlink_create_conntrack(cda, &otuple, &rtuple);
+ goto out_unlock;
+ } else {
+ /* we only allow nat config for new conntracks */
+ if (cda[CTA_NAT-1]) {
+ err = -EINVAL;
+ goto out_unlock;
+ }
+ }
+
+ /* We manipulate the conntrack inside the global conntrack table lock,
+ * so there's no need to increase the refcount */
+ DEBUGP("conntrack found\n");
+ err = -EEXIST;
+ if (!(nlh->nlmsg_flags & NLM_F_EXCL))
+ err = ctnetlink_change_conntrack(tuplehash_to_ctrack(h), cda);
+
+out_unlock:
+ write_unlock_bh(&ip_conntrack_lock);
+ return err;
+}
+
+/***********************************************************************
+ * EXPECT
+ ***********************************************************************/
+
+static inline int
+ctnetlink_exp_dump_tuple(struct sk_buff *skb,
+ const struct ip_conntrack_tuple *tuple,
+ enum ctattr_expect type)
+{
+ struct nfattr *nest_parms = NFA_NEST(skb, type);
+
+ if (ctnetlink_dump_tuples(skb, tuple) < 0)
+ goto nfattr_failure;
+
+ NFA_NEST_END(skb, nest_parms);
+
+ return 0;
+
+nfattr_failure:
+ return -1;
+}
+
+static inline int
+ctnetlink_exp_dump_expect(struct sk_buff *skb,
+ const struct ip_conntrack_expect *exp)
+{
+ u_int32_t timeout = htonl((exp->timeout.expires - jiffies) / HZ);
+ u_int32_t id = htonl(exp->id);
+ struct nfattr *nest_parms = NFA_NEST(skb, CTA_EXPECT);
+
+ if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
+ goto nfattr_failure;
+ if (ctnetlink_exp_dump_tuple(skb, &exp->mask, CTA_EXPECT_MASK) < 0)
+ goto nfattr_failure;
+
+ NFA_PUT(skb, CTA_EXPECT_TIMEOUT, sizeof(timeout), &timeout);
+ NFA_PUT(skb, CTA_EXPECT_ID, sizeof(u_int32_t), &id);
+ NFA_NEST_END(skb, nest_parms);
+
+ return 0;
+
+nfattr_failure:
+ return -1;
+}
+
+static int
+ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
+ int event,
+ int nowait,
+ const struct ip_conntrack_expect *exp)
+{
+ struct nlmsghdr *nlh;
+ struct nfgenmsg *nfmsg;
+ unsigned char *b;
+
+ b = skb->tail;
+
+ event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
+ nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
+ nfmsg = NLMSG_DATA(nlh);
+
+ nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0;
+ nfmsg->nfgen_family = AF_INET;
+ nfmsg->version = NFNETLINK_V0;
+ nfmsg->res_id = 0;
+
+ if (ctnetlink_exp_dump_expect(skb, exp) < 0)
+ goto nfattr_failure;
+
+ nlh->nlmsg_len = skb->tail - b;
+ return skb->len;
+
+nlmsg_failure:
+nfattr_failure:
+ skb_trim(skb, b - skb->data);
+ return -1;
+}
+
+#ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
+static int ctnetlink_expect_event(struct notifier_block *this,
+ unsigned long events, void *ptr)
+{
+ struct nlmsghdr *nlh;
+ struct nfgenmsg *nfmsg;
+ struct ip_conntrack_expect *exp = (struct ip_conntrack_expect *)ptr;
+ struct sk_buff *skb;
+ unsigned int type;
+ unsigned char *b;
+ int flags = 0;
+ u16 proto;
+
+ if (events & IPEXP_NEW) {
+ type = IPCTNL_MSG_EXP_NEW;
+ flags = NLM_F_CREATE|NLM_F_EXCL;
+ } else
+ return NOTIFY_DONE;
+
+ skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
+ if (!skb)
+ return NOTIFY_DONE;
+
+ b = skb->tail;
+
+ type |= NFNL_SUBSYS_CTNETLINK << 8;
+ nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
+ nfmsg = NLMSG_DATA(nlh);
+
+ nlh->nlmsg_flags = flags;
+ nfmsg->nfgen_family = AF_INET;
+ nfmsg->version = NFNETLINK_V0;
+ nfmsg->res_id = 0;
+
+ if (ctnetlink_exp_dump_expect(skb, exp) < 0)
+ goto nfattr_failure;
+
+ nlh->nlmsg_len = skb->tail - b;
+ proto = exp->tuple.dst.protonum;
+ nfnetlink_send(skb, 0, NF_NETLINK_CONNTRACK_EXP_NEW, 0);
+ return NOTIFY_DONE;
+
+nlmsg_failure:
+nfattr_failure:
+ kfree_skb(skb);
+ return NOTIFY_DONE;
+}
+#endif
+
+static int
+ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ struct ip_conntrack_expect *exp = NULL;
+ struct list_head *i;
+ u_int32_t *id = (u_int32_t *) &cb->args[0];
+
+ DEBUGP("entered %s, last id=%llu\n", __FUNCTION__, *id);
+
+ read_lock_bh(&ip_conntrack_lock);
+ list_for_each(i, &ip_conntrack_expect_list) {
+ exp = (struct ip_conntrack_expect *) i;
+ if (exp->id <= *id)
+ continue;
+ if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).pid,
+ cb->nlh->nlmsg_seq,
+ IPCTNL_MSG_EXP_NEW,
+ 1, exp) < 0)
+ goto out;
+ *id = exp->id;
+ }
+out:
+ read_unlock_bh(&ip_conntrack_lock);
+
+ DEBUGP("leaving, last id=%llu\n", *id);
+
+ return skb->len;
+}
+
+static int
+ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
+ struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
+{
+ struct ip_conntrack_tuple tuple;
+ struct ip_conntrack_expect *exp;
+ struct sk_buff *skb2;
+ int err = 0;
+
+ DEBUGP("entered %s\n", __FUNCTION__);
+
+ if (nlh->nlmsg_flags & NLM_F_DUMP) {
+ struct nfgenmsg *msg = NLMSG_DATA(nlh);
+ u32 rlen;
+
+ if (msg->nfgen_family != AF_INET)
+ return -EAFNOSUPPORT;
+
+ if ((*errp = netlink_dump_start(ctnl, skb, nlh,
+ ctnetlink_exp_dump_table,
+ ctnetlink_done)) != 0)
+ return -EINVAL;
+ rlen = NLMSG_ALIGN(nlh->nlmsg_len);
+ if (rlen > skb->len)
+ rlen = skb->len;
+ skb_pull(skb, rlen);
+ return 0;
+ }
+
+ if (cda[CTA_TUPLE_ORIG-1])
+ err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG);
+ else if (cda[CTA_TUPLE_REPLY-1])
+ err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY);
+ else
+ return -EINVAL;
+
+ if (err < 0)
+ return err;
+
+ exp = ip_conntrack_expect_find_get(&tuple);
+ if (!exp)
+ return -ENOENT;
+
+ err = -ENOMEM;
+ skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
+ if (!skb2)
+ goto out;
+ NETLINK_CB(skb2).dst_pid = NETLINK_CB(skb).pid;
+
+ err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
+ nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW,
+ 1, exp);
+ if (err <= 0)
+ goto out;
+
+ ip_conntrack_expect_put(exp);
+
+ err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
+ if (err < 0)
+ goto free;
+
+ return err;
+
+out:
+ ip_conntrack_expect_put(exp);
+free:
+ if (skb2)
+ kfree_skb(skb2);
+ return err;
+}
+
+static int
+ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
+ struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
+{
+ struct ip_conntrack_expect *exp, *tmp;
+ struct ip_conntrack_tuple tuple;
+ struct ip_conntrack_helper *h;
+ int err;
+
+ /* delete by tuple needs either orig or reply tuple */
+ if (cda[CTA_TUPLE_ORIG-1])
+ err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG);
+ else if (cda[CTA_TUPLE_REPLY-1])
+ err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY);
+ else if (cda[CTA_HELP_NAME-1]) {
+ char *name = NFA_DATA(cda[CTA_HELP_NAME-1]);
+
+ /* delete all expectations for this helper */
+ write_lock_bh(&ip_conntrack_lock);
+ h = __ip_conntrack_helper_find_byname(name);
+ if (!h) {
+ write_unlock_bh(&ip_conntrack_lock);
+ return -EINVAL;
+ }
+ list_for_each_entry_safe(exp, tmp, &ip_conntrack_expect_list,
+ list) {
+ if (exp->master->helper == h
+ && del_timer(&exp->timeout))
+ __ip_ct_expect_unlink_destroy(exp);
+ }
+ write_unlock(&ip_conntrack_lock);
+ return 0;
+ } else {
+ /* This basically means we have to flush everything*/
+ write_lock_bh(&ip_conntrack_lock);
+ list_for_each_entry_safe(exp, tmp, &ip_conntrack_expect_list,
+ list) {
+ if (del_timer(&exp->timeout))
+ __ip_ct_expect_unlink_destroy(exp);
+ }
+ write_unlock_bh(&ip_conntrack_lock);
+ return 0;
+ }
+
+ if (err < 0)
+ return err;
+
+ /* bump usage count to 2 */
+ exp = ip_conntrack_expect_find_get(&tuple);
+ if (!exp)
+ return -ENOENT;
+
+ if (cda[CTA_EXPECT_ID-1]) {
+ u_int32_t id = *(u_int32_t *)NFA_DATA(cda[CTA_EXPECT_ID-1]);
+ if (exp->id != ntohl(id)) {
+ ip_conntrack_expect_put(exp);
+ return -ENOENT;
+ }
+ }
+
+ /* after list removal, usage count == 1 */
+ ip_conntrack_unexpect_related(exp);
+ /* have to put what we 'get' above. after this line usage count == 0 */
+ ip_conntrack_expect_put(exp);
+
+ return 0;
+}
+static int
+ctnetlink_change_expect(struct ip_conntrack_expect *x, struct nfattr *cda[])
+{
+ return -EOPNOTSUPP;
+}
+
+static int
+ctnetlink_create_expect(struct nfattr *cda[])
+{
+ struct ip_conntrack_tuple tuple, mask, master_tuple;
+ struct ip_conntrack_tuple_hash *h = NULL;
+ struct ip_conntrack_expect *exp;
+ struct ip_conntrack *ct;
+ int err = 0;
+
+ DEBUGP("entered %s\n", __FUNCTION__);
+
+ err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE);
+ if (err < 0)
+ return err;
+ err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASK);
+ if (err < 0)
+ return err;
+
+ if (cda[CTA_TUPLE_ORIG-1])
+ err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_TUPLE_ORIG);
+ else if (cda[CTA_TUPLE_REPLY-1])
+ err = ctnetlink_parse_tuple(cda, &master_tuple,
+ CTA_TUPLE_REPLY);
+ else
+ return -EINVAL;
+
+ if (err < 0)
+ return err;
+
+ /* Look for master conntrack of this expectation */
+ h = ip_conntrack_find_get(&master_tuple, NULL);
+ if (!h)
+ return -ENOENT;
+ ct = tuplehash_to_ctrack(h);
+
+ if (!ct->helper) {
+ /* such conntrack hasn't got any helper, abort */
+ err = -EINVAL;
+ goto out;
+ }
+
+ exp = ip_conntrack_expect_alloc(ct);
+ if (!exp) {
+ err = -ENOMEM;
+ goto out;
+ }
+
+ exp->expectfn = NULL;
+ exp->master = ct;
+ memcpy(&exp->tuple, &tuple, sizeof(struct ip_conntrack_tuple));
+ memcpy(&exp->mask, &mask, sizeof(struct ip_conntrack_tuple));
+
+ err = ip_conntrack_expect_related(exp);
+ ip_conntrack_expect_put(exp);
+
+out:
+ ip_conntrack_put(tuplehash_to_ctrack(h));
+ return err;
+}
+
+static int
+ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
+ struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
+{
+ struct ip_conntrack_tuple tuple;
+ struct ip_conntrack_expect *exp;
+ int err = 0;
+
+ DEBUGP("entered %s\n", __FUNCTION__);
+
+ if (!cda[CTA_EXPECT_TUPLE-1] || !cda[CTA_EXPECT_MASK-1])
+ return -EINVAL;
+
+ err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE);
+ if (err < 0)
+ return err;
+
+ write_lock_bh(&ip_conntrack_lock);
+ exp = __ip_conntrack_expect_find(&tuple);
+
+ if (!exp) {
+ write_unlock_bh(&ip_conntrack_lock);
+ err = -ENOENT;
+ if (nlh->nlmsg_flags & NLM_F_CREATE)
+ err = ctnetlink_create_expect(cda);
+ return err;
+ }
+
+ err = -EEXIST;
+ if (!(nlh->nlmsg_flags & NLM_F_EXCL))
+ err = ctnetlink_change_expect(exp, cda);
+ write_unlock_bh(&ip_conntrack_lock);
+
+ DEBUGP("leaving\n");
+
+ return err;
+}
+
+#ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
+static struct notifier_block ctnl_notifier = {
+ .notifier_call = ctnetlink_conntrack_event,
+};
+
+static struct notifier_block ctnl_notifier_exp = {
+ .notifier_call = ctnetlink_expect_event,
+};
+#endif
+
+static struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
+ [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
+ .cap_required = CAP_NET_ADMIN },
+ [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
+ .cap_required = CAP_NET_ADMIN },
+ [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
+ .cap_required = CAP_NET_ADMIN },
+ [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
+ .cap_required = CAP_NET_ADMIN },
+};
+
+static struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_MAX] = {
+ [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
+ .cap_required = CAP_NET_ADMIN },
+ [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
+ .cap_required = CAP_NET_ADMIN },
+ [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
+ .cap_required = CAP_NET_ADMIN },
+};
+
+static struct nfnetlink_subsystem ctnl_subsys = {
+ .name = "conntrack",
+ .subsys_id = NFNL_SUBSYS_CTNETLINK,
+ .cb_count = IPCTNL_MSG_MAX,
+ .attr_count = CTA_MAX,
+ .cb = ctnl_cb,
+};
+
+static struct nfnetlink_subsystem ctnl_exp_subsys = {
+ .name = "conntrack_expect",
+ .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
+ .cb_count = IPCTNL_MSG_EXP_MAX,
+ .attr_count = CTA_MAX,
+ .cb = ctnl_exp_cb,
+};
+
+static int __init ctnetlink_init(void)
+{
+ int ret;
+
+ printk("ctnetlink v%s: registering with nfnetlink.\n", version);
+ ret = nfnetlink_subsys_register(&ctnl_subsys);
+ if (ret < 0) {
+ printk("ctnetlink_init: cannot register with nfnetlink.\n");
+ goto err_out;
+ }
+
+ ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
+ if (ret < 0) {
+ printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
+ goto err_unreg_subsys;
+ }
+
+#ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
+ ret = ip_conntrack_register_notifier(&ctnl_notifier);
+ if (ret < 0) {
+ printk("ctnetlink_init: cannot register notifier.\n");
+ goto err_unreg_exp_subsys;
+ }
+
+ ret = ip_conntrack_expect_register_notifier(&ctnl_notifier_exp);
+ if (ret < 0) {
+ printk("ctnetlink_init: cannot expect register notifier.\n");
+ goto err_unreg_notifier;
+ }
+#endif
+
+ return 0;
+
+#ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
+err_unreg_notifier:
+ ip_conntrack_unregister_notifier(&ctnl_notifier);
+err_unreg_exp_subsys:
+ nfnetlink_subsys_unregister(&ctnl_exp_subsys);
+#endif
+err_unreg_subsys:
+ nfnetlink_subsys_unregister(&ctnl_subsys);
+err_out:
+ return ret;
+}
+
+static void __exit ctnetlink_exit(void)
+{
+ printk("ctnetlink: unregistering from nfnetlink.\n");
+
+#ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
+ ip_conntrack_unregister_notifier(&ctnl_notifier_exp);
+ ip_conntrack_unregister_notifier(&ctnl_notifier);
+#endif
+
+ nfnetlink_subsys_unregister(&ctnl_exp_subsys);
+ nfnetlink_subsys_unregister(&ctnl_subsys);
+ return;
+}
+
+module_init(ctnetlink_init);
+module_exit(ctnetlink_exit);
projects / linux-2.6 / commitdiff