netfilter: nfnetlink_log: add net namespace support for nfnetlink_log

This patch makes /proc/net/netfilter/nfnetlink_log pernet.
Moreover, there's a pernet instance table and lock.

Signed-off-by: Gao feng <gaofeng@cn.fujitsu.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Gao feng 2013-03-24 23:50:45 +00:00 коммит произвёл Pablo Neira Ayuso
Родитель 355430671a
Коммит 9368a53c47
1 изменённых файлов: 117 добавлений и 60 удалений

Просмотреть файл

@ -32,6 +32,7 @@
#include <linux/slab.h>
#include <net/sock.h>
#include <net/netfilter/nf_log.h>
#include <net/netns/generic.h>
#include <net/netfilter/nfnetlink_log.h>
#include <linux/atomic.h>
@ -56,6 +57,7 @@ struct nfulnl_instance {
unsigned int qlen; /* number of nlmsgs in skb */
struct sk_buff *skb; /* pre-allocatd skb */
struct timer_list timer;
struct net *net;
struct user_namespace *peer_user_ns; /* User namespace of the peer process */
int peer_portid; /* PORTID of the peer process */
@ -71,25 +73,34 @@ struct nfulnl_instance {
struct rcu_head rcu;
};
static DEFINE_SPINLOCK(instances_lock);
static atomic_t global_seq;
#define INSTANCE_BUCKETS 16
static struct hlist_head instance_table[INSTANCE_BUCKETS];
static unsigned int hash_init;
static int nfnl_log_net_id __read_mostly;
struct nfnl_log_net {
spinlock_t instances_lock;
struct hlist_head instance_table[INSTANCE_BUCKETS];
atomic_t global_seq;
};
static struct nfnl_log_net *nfnl_log_pernet(struct net *net)
{
return net_generic(net, nfnl_log_net_id);
}
static inline u_int8_t instance_hashfn(u_int16_t group_num)
{
return ((group_num & 0xff) % INSTANCE_BUCKETS);
}
static struct nfulnl_instance *
__instance_lookup(u_int16_t group_num)
__instance_lookup(struct nfnl_log_net *log, u_int16_t group_num)
{
struct hlist_head *head;
struct nfulnl_instance *inst;
head = &instance_table[instance_hashfn(group_num)];
head = &log->instance_table[instance_hashfn(group_num)];
hlist_for_each_entry_rcu(inst, head, hlist) {
if (inst->group_num == group_num)
return inst;
@ -104,12 +115,12 @@ instance_get(struct nfulnl_instance *inst)
}
static struct nfulnl_instance *
instance_lookup_get(u_int16_t group_num)
instance_lookup_get(struct nfnl_log_net *log, u_int16_t group_num)
{
struct nfulnl_instance *inst;
rcu_read_lock_bh();
inst = __instance_lookup(group_num);
inst = __instance_lookup(log, group_num);
if (inst && !atomic_inc_not_zero(&inst->use))
inst = NULL;
rcu_read_unlock_bh();
@ -119,7 +130,11 @@ instance_lookup_get(u_int16_t group_num)
static void nfulnl_instance_free_rcu(struct rcu_head *head)
{
kfree(container_of(head, struct nfulnl_instance, rcu));
struct nfulnl_instance *inst =
container_of(head, struct nfulnl_instance, rcu);
put_net(inst->net);
kfree(inst);
module_put(THIS_MODULE);
}
@ -133,13 +148,15 @@ instance_put(struct nfulnl_instance *inst)
static void nfulnl_timer(unsigned long data);
static struct nfulnl_instance *
instance_create(u_int16_t group_num, int portid, struct user_namespace *user_ns)
instance_create(struct net *net, u_int16_t group_num,
int portid, struct user_namespace *user_ns)
{
struct nfulnl_instance *inst;
struct nfnl_log_net *log = nfnl_log_pernet(net);
int err;
spin_lock_bh(&instances_lock);
if (__instance_lookup(group_num)) {
spin_lock_bh(&log->instances_lock);
if (__instance_lookup(log, group_num)) {
err = -EEXIST;
goto out_unlock;
}
@ -163,6 +180,7 @@ instance_create(u_int16_t group_num, int portid, struct user_namespace *user_ns)
setup_timer(&inst->timer, nfulnl_timer, (unsigned long)inst);
inst->net = get_net(net);
inst->peer_user_ns = user_ns;
inst->peer_portid = portid;
inst->group_num = group_num;
@ -174,14 +192,15 @@ instance_create(u_int16_t group_num, int portid, struct user_namespace *user_ns)
inst->copy_range = NFULNL_COPY_RANGE_MAX;
hlist_add_head_rcu(&inst->hlist,
&instance_table[instance_hashfn(group_num)]);
&log->instance_table[instance_hashfn(group_num)]);
spin_unlock_bh(&instances_lock);
spin_unlock_bh(&log->instances_lock);
return inst;
out_unlock:
spin_unlock_bh(&instances_lock);
spin_unlock_bh(&log->instances_lock);
return ERR_PTR(err);
}
@ -210,11 +229,12 @@ __instance_destroy(struct nfulnl_instance *inst)
}
static inline void
instance_destroy(struct nfulnl_instance *inst)
instance_destroy(struct nfnl_log_net *log,
struct nfulnl_instance *inst)
{
spin_lock_bh(&instances_lock);
spin_lock_bh(&log->instances_lock);
__instance_destroy(inst);
spin_unlock_bh(&instances_lock);
spin_unlock_bh(&log->instances_lock);
}
static int
@ -336,7 +356,7 @@ __nfulnl_send(struct nfulnl_instance *inst)
if (!nlh)
goto out;
}
status = nfnetlink_unicast(inst->skb, &init_net, inst->peer_portid,
status = nfnetlink_unicast(inst->skb, inst->net, inst->peer_portid,
MSG_DONTWAIT);
inst->qlen = 0;
@ -370,7 +390,8 @@ nfulnl_timer(unsigned long data)
/* This is an inline function, we don't really care about a long
* list of arguments */
static inline int
__build_packet_message(struct nfulnl_instance *inst,
__build_packet_message(struct nfnl_log_net *log,
struct nfulnl_instance *inst,
const struct sk_buff *skb,
unsigned int data_len,
u_int8_t pf,
@ -536,7 +557,7 @@ __build_packet_message(struct nfulnl_instance *inst,
/* global sequence number */
if ((inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) &&
nla_put_be32(inst->skb, NFULA_SEQ_GLOBAL,
htonl(atomic_inc_return(&global_seq))))
htonl(atomic_inc_return(&log->global_seq))))
goto nla_put_failure;
if (data_len) {
@ -592,13 +613,15 @@ nfulnl_log_packet(u_int8_t pf,
const struct nf_loginfo *li;
unsigned int qthreshold;
unsigned int plen;
struct net *net = dev_net(in ? in : out);
struct nfnl_log_net *log = nfnl_log_pernet(net);
if (li_user && li_user->type == NF_LOG_TYPE_ULOG)
li = li_user;
else
li = &default_loginfo;
inst = instance_lookup_get(li->u.ulog.group);
inst = instance_lookup_get(log, li->u.ulog.group);
if (!inst)
return;
@ -680,7 +703,7 @@ nfulnl_log_packet(u_int8_t pf,
inst->qlen++;
__build_packet_message(inst, skb, data_len, pf,
__build_packet_message(log, inst, skb, data_len, pf,
hooknum, in, out, prefix, plen);
if (inst->qlen >= qthreshold)
@ -709,24 +732,24 @@ nfulnl_rcv_nl_event(struct notifier_block *this,
unsigned long event, void *ptr)
{
struct netlink_notify *n = ptr;
struct nfnl_log_net *log = nfnl_log_pernet(n->net);
if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) {
int i;
/* destroy all instances for this portid */
spin_lock_bh(&instances_lock);
spin_lock_bh(&log->instances_lock);
for (i = 0; i < INSTANCE_BUCKETS; i++) {
struct hlist_node *t2;
struct nfulnl_instance *inst;
struct hlist_head *head = &instance_table[i];
struct hlist_head *head = &log->instance_table[i];
hlist_for_each_entry_safe(inst, t2, head, hlist) {
if ((net_eq(n->net, &init_net)) &&
(n->portid == inst->peer_portid))
if (n->portid == inst->peer_portid)
__instance_destroy(inst);
}
}
spin_unlock_bh(&instances_lock);
spin_unlock_bh(&log->instances_lock);
}
return NOTIFY_DONE;
}
@ -768,6 +791,7 @@ nfulnl_recv_config(struct sock *ctnl, struct sk_buff *skb,
struct nfulnl_instance *inst;
struct nfulnl_msg_config_cmd *cmd = NULL;
struct net *net = sock_net(ctnl);
struct nfnl_log_net *log = nfnl_log_pernet(net);
int ret = 0;
if (nfula[NFULA_CFG_CMD]) {
@ -784,7 +808,7 @@ nfulnl_recv_config(struct sock *ctnl, struct sk_buff *skb,
}
}
inst = instance_lookup_get(group_num);
inst = instance_lookup_get(log, group_num);
if (inst && inst->peer_portid != NETLINK_CB(skb).portid) {
ret = -EPERM;
goto out_put;
@ -798,7 +822,7 @@ nfulnl_recv_config(struct sock *ctnl, struct sk_buff *skb,
goto out_put;
}
inst = instance_create(group_num,
inst = instance_create(net, group_num,
NETLINK_CB(skb).portid,
sk_user_ns(NETLINK_CB(skb).ssk));
if (IS_ERR(inst)) {
@ -812,7 +836,7 @@ nfulnl_recv_config(struct sock *ctnl, struct sk_buff *skb,
goto out;
}
instance_destroy(inst);
instance_destroy(log, inst);
goto out_put;
default:
ret = -ENOTSUPP;
@ -895,55 +919,68 @@ static const struct nfnetlink_subsystem nfulnl_subsys = {
#ifdef CONFIG_PROC_FS
struct iter_state {
struct seq_net_private p;
unsigned int bucket;
};
static struct hlist_node *get_first(struct iter_state *st)
static struct hlist_node *get_first(struct net *net, struct iter_state *st)
{
struct nfnl_log_net *log;
if (!st)
return NULL;
log = nfnl_log_pernet(net);
for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) {
if (!hlist_empty(&instance_table[st->bucket]))
return rcu_dereference_bh(hlist_first_rcu(&instance_table[st->bucket]));
struct hlist_head *head = &log->instance_table[st->bucket];
if (!hlist_empty(head))
return rcu_dereference_bh(hlist_first_rcu(head));
}
return NULL;
}
static struct hlist_node *get_next(struct iter_state *st, struct hlist_node *h)
static struct hlist_node *get_next(struct net *net, struct iter_state *st,
struct hlist_node *h)
{
h = rcu_dereference_bh(hlist_next_rcu(h));
while (!h) {
struct nfnl_log_net *log;
struct hlist_head *head;
if (++st->bucket >= INSTANCE_BUCKETS)
return NULL;
h = rcu_dereference_bh(hlist_first_rcu(&instance_table[st->bucket]));
log = nfnl_log_pernet(net);
head = &log->instance_table[st->bucket];
h = rcu_dereference_bh(hlist_first_rcu(head));
}
return h;
}
static struct hlist_node *get_idx(struct iter_state *st, loff_t pos)
static struct hlist_node *get_idx(struct net *net, struct iter_state *st,
loff_t pos)
{
struct hlist_node *head;
head = get_first(st);
head = get_first(net, st);
if (head)
while (pos && (head = get_next(st, head)))
while (pos && (head = get_next(net, st, head)))
pos--;
return pos ? NULL : head;
}
static void *seq_start(struct seq_file *seq, loff_t *pos)
static void *seq_start(struct seq_file *s, loff_t *pos)
__acquires(rcu_bh)
{
rcu_read_lock_bh();
return get_idx(seq->private, *pos);
return get_idx(seq_file_net(s), s->private, *pos);
}
static void *seq_next(struct seq_file *s, void *v, loff_t *pos)
{
(*pos)++;
return get_next(s->private, v);
return get_next(seq_file_net(s), s->private, v);
}
static void seq_stop(struct seq_file *s, void *v)
@ -972,8 +1009,8 @@ static const struct seq_operations nful_seq_ops = {
static int nful_open(struct inode *inode, struct file *file)
{
return seq_open_private(file, &nful_seq_ops,
sizeof(struct iter_state));
return seq_open_net(inode, file, &nful_seq_ops,
sizeof(struct iter_state));
}
static const struct file_operations nful_file_ops = {
@ -981,17 +1018,43 @@ static const struct file_operations nful_file_ops = {
.open = nful_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release_private,
.release = seq_release_net,
};
#endif /* PROC_FS */
static int __init nfnetlink_log_init(void)
static int __net_init nfnl_log_net_init(struct net *net)
{
int i, status = -ENOMEM;
unsigned int i;
struct nfnl_log_net *log = nfnl_log_pernet(net);
for (i = 0; i < INSTANCE_BUCKETS; i++)
INIT_HLIST_HEAD(&instance_table[i]);
INIT_HLIST_HEAD(&log->instance_table[i]);
spin_lock_init(&log->instances_lock);
#ifdef CONFIG_PROC_FS
if (!proc_create("nfnetlink_log", 0440,
net->nf.proc_netfilter, &nful_file_ops))
return -ENOMEM;
#endif
return 0;
}
static void __net_exit nfnl_log_net_exit(struct net *net)
{
remove_proc_entry("nfnetlink_log", net->nf.proc_netfilter);
}
static struct pernet_operations nfnl_log_net_ops = {
.init = nfnl_log_net_init,
.exit = nfnl_log_net_exit,
.id = &nfnl_log_net_id,
.size = sizeof(struct nfnl_log_net),
};
static int __init nfnetlink_log_init(void)
{
int status = -ENOMEM;
/* it's not really all that important to have a random value, so
* we can do this from the init function, even if there hasn't
@ -1001,29 +1064,25 @@ static int __init nfnetlink_log_init(void)
netlink_register_notifier(&nfulnl_rtnl_notifier);
status = nfnetlink_subsys_register(&nfulnl_subsys);
if (status < 0) {
printk(KERN_ERR "log: failed to create netlink socket\n");
pr_err("log: failed to create netlink socket\n");
goto cleanup_netlink_notifier;
}
status = nf_log_register(NFPROTO_UNSPEC, &nfulnl_logger);
if (status < 0) {
printk(KERN_ERR "log: failed to register logger\n");
pr_err("log: failed to register logger\n");
goto cleanup_subsys;
}
#ifdef CONFIG_PROC_FS
if (!proc_create("nfnetlink_log", 0440,
proc_net_netfilter, &nful_file_ops)) {
status = -ENOMEM;
status = register_pernet_subsys(&nfnl_log_net_ops);
if (status < 0) {
pr_err("log: failed to register pernet ops\n");
goto cleanup_logger;
}
#endif
return status;
#ifdef CONFIG_PROC_FS
cleanup_logger:
nf_log_unregister(&nfulnl_logger);
#endif
cleanup_subsys:
nfnetlink_subsys_unregister(&nfulnl_subsys);
cleanup_netlink_notifier:
@ -1033,10 +1092,8 @@ cleanup_netlink_notifier:
static void __exit nfnetlink_log_fini(void)
{
unregister_pernet_subsys(&nfnl_log_net_ops);
nf_log_unregister(&nfulnl_logger);
#ifdef CONFIG_PROC_FS
remove_proc_entry("nfnetlink_log", proc_net_netfilter);
#endif
nfnetlink_subsys_unregister(&nfulnl_subsys);
netlink_unregister_notifier(&nfulnl_rtnl_notifier);
}