netfilter: nfnetlink_queue: add net namespace support for nfnetlink_queue
This patch makes /proc/net/netfilter/nfnetlink_queue 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
Pablo Neira Ayuso
parent
5b023fc8d8
commit
e817961048
@ -30,6 +30,7 @@
|
||||
#include <linux/list.h>
|
||||
#include <net/sock.h>
|
||||
#include <net/netfilter/nf_queue.h>
|
||||
#include <net/netns/generic.h>
|
||||
#include <net/netfilter/nfnetlink_queue.h>
|
||||
|
||||
#include <linux/atomic.h>
|
||||
@ -66,10 +67,18 @@ struct nfqnl_instance {
|
||||
|
||||
typedef int (*nfqnl_cmpfn)(struct nf_queue_entry *, unsigned long);
|
||||
|
||||
static DEFINE_SPINLOCK(instances_lock);
|
||||
static int nfnl_queue_net_id __read_mostly;
|
||||
|
||||
#define INSTANCE_BUCKETS 16
|
||||
static struct hlist_head instance_table[INSTANCE_BUCKETS] __read_mostly;
|
||||
struct nfnl_queue_net {
|
||||
spinlock_t instances_lock;
|
||||
struct hlist_head instance_table[INSTANCE_BUCKETS];
|
||||
};
|
||||
|
||||
static struct nfnl_queue_net *nfnl_queue_pernet(struct net *net)
|
||||
{
|
||||
return net_generic(net, nfnl_queue_net_id);
|
||||
}
|
||||
|
||||
static inline u_int8_t instance_hashfn(u_int16_t queue_num)
|
||||
{
|
||||
@ -77,12 +86,12 @@ static inline u_int8_t instance_hashfn(u_int16_t queue_num)
|
||||
}
|
||||
|
||||
static struct nfqnl_instance *
|
||||
instance_lookup(u_int16_t queue_num)
|
||||
instance_lookup(struct nfnl_queue_net *q, u_int16_t queue_num)
|
||||
{
|
||||
struct hlist_head *head;
|
||||
struct nfqnl_instance *inst;
|
||||
|
||||
head = &instance_table[instance_hashfn(queue_num)];
|
||||
head = &q->instance_table[instance_hashfn(queue_num)];
|
||||
hlist_for_each_entry_rcu(inst, head, hlist) {
|
||||
if (inst->queue_num == queue_num)
|
||||
return inst;
|
||||
@ -91,14 +100,15 @@ instance_lookup(u_int16_t queue_num)
|
||||
}
|
||||
|
||||
static struct nfqnl_instance *
|
||||
instance_create(u_int16_t queue_num, int portid)
|
||||
instance_create(struct nfnl_queue_net *q, u_int16_t queue_num,
|
||||
int portid)
|
||||
{
|
||||
struct nfqnl_instance *inst;
|
||||
unsigned int h;
|
||||
int err;
|
||||
|
||||
spin_lock(&instances_lock);
|
||||
if (instance_lookup(queue_num)) {
|
||||
spin_lock(&q->instances_lock);
|
||||
if (instance_lookup(q, queue_num)) {
|
||||
err = -EEXIST;
|
||||
goto out_unlock;
|
||||
}
|
||||
@ -123,16 +133,16 @@ instance_create(u_int16_t queue_num, int portid)
|
||||
}
|
||||
|
||||
h = instance_hashfn(queue_num);
|
||||
hlist_add_head_rcu(&inst->hlist, &instance_table[h]);
|
||||
hlist_add_head_rcu(&inst->hlist, &q->instance_table[h]);
|
||||
|
||||
spin_unlock(&instances_lock);
|
||||
spin_unlock(&q->instances_lock);
|
||||
|
||||
return inst;
|
||||
|
||||
out_free:
|
||||
kfree(inst);
|
||||
out_unlock:
|
||||
spin_unlock(&instances_lock);
|
||||
spin_unlock(&q->instances_lock);
|
||||
return ERR_PTR(err);
|
||||
}
|
||||
|
||||
@ -158,11 +168,11 @@ __instance_destroy(struct nfqnl_instance *inst)
|
||||
}
|
||||
|
||||
static void
|
||||
instance_destroy(struct nfqnl_instance *inst)
|
||||
instance_destroy(struct nfnl_queue_net *q, struct nfqnl_instance *inst)
|
||||
{
|
||||
spin_lock(&instances_lock);
|
||||
spin_lock(&q->instances_lock);
|
||||
__instance_destroy(inst);
|
||||
spin_unlock(&instances_lock);
|
||||
spin_unlock(&q->instances_lock);
|
||||
}
|
||||
|
||||
static inline void
|
||||
@ -473,9 +483,12 @@ nfqnl_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum)
|
||||
int err = -ENOBUFS;
|
||||
__be32 *packet_id_ptr;
|
||||
int failopen = 0;
|
||||
struct net *net = dev_net(entry->indev ?
|
||||
entry->indev : entry->outdev);
|
||||
struct nfnl_queue_net *q = nfnl_queue_pernet(net);
|
||||
|
||||
/* rcu_read_lock()ed by nf_hook_slow() */
|
||||
queue = instance_lookup(queuenum);
|
||||
queue = instance_lookup(q, queuenum);
|
||||
if (!queue) {
|
||||
err = -ESRCH;
|
||||
goto err_out;
|
||||
@ -512,7 +525,7 @@ nfqnl_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum)
|
||||
*packet_id_ptr = htonl(entry->id);
|
||||
|
||||
/* nfnetlink_unicast will either free the nskb or add it to a socket */
|
||||
err = nfnetlink_unicast(nskb, &init_net, queue->peer_portid, MSG_DONTWAIT);
|
||||
err = nfnetlink_unicast(nskb, net, queue->peer_portid, MSG_DONTWAIT);
|
||||
if (err < 0) {
|
||||
queue->queue_user_dropped++;
|
||||
goto err_out_unlock;
|
||||
@ -625,15 +638,16 @@ dev_cmp(struct nf_queue_entry *entry, unsigned long ifindex)
|
||||
/* drop all packets with either indev or outdev == ifindex from all queue
|
||||
* instances */
|
||||
static void
|
||||
nfqnl_dev_drop(int ifindex)
|
||||
nfqnl_dev_drop(struct net *net, int ifindex)
|
||||
{
|
||||
int i;
|
||||
struct nfnl_queue_net *q = nfnl_queue_pernet(net);
|
||||
|
||||
rcu_read_lock();
|
||||
|
||||
for (i = 0; i < INSTANCE_BUCKETS; i++) {
|
||||
struct nfqnl_instance *inst;
|
||||
struct hlist_head *head = &instance_table[i];
|
||||
struct hlist_head *head = &q->instance_table[i];
|
||||
|
||||
hlist_for_each_entry_rcu(inst, head, hlist)
|
||||
nfqnl_flush(inst, dev_cmp, ifindex);
|
||||
@ -650,12 +664,9 @@ nfqnl_rcv_dev_event(struct notifier_block *this,
|
||||
{
|
||||
struct net_device *dev = ptr;
|
||||
|
||||
if (!net_eq(dev_net(dev), &init_net))
|
||||
return NOTIFY_DONE;
|
||||
|
||||
/* Drop any packets associated with the downed device */
|
||||
if (event == NETDEV_DOWN)
|
||||
nfqnl_dev_drop(dev->ifindex);
|
||||
nfqnl_dev_drop(dev_net(dev), dev->ifindex);
|
||||
return NOTIFY_DONE;
|
||||
}
|
||||
|
||||
@ -668,24 +679,24 @@ nfqnl_rcv_nl_event(struct notifier_block *this,
|
||||
unsigned long event, void *ptr)
|
||||
{
|
||||
struct netlink_notify *n = ptr;
|
||||
struct nfnl_queue_net *q = nfnl_queue_pernet(n->net);
|
||||
|
||||
if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) {
|
||||
int i;
|
||||
|
||||
/* destroy all instances for this portid */
|
||||
spin_lock(&instances_lock);
|
||||
spin_lock(&q->instances_lock);
|
||||
for (i = 0; i < INSTANCE_BUCKETS; i++) {
|
||||
struct hlist_node *t2;
|
||||
struct nfqnl_instance *inst;
|
||||
struct hlist_head *head = &instance_table[i];
|
||||
struct hlist_head *head = &q->instance_table[i];
|
||||
|
||||
hlist_for_each_entry_safe(inst, t2, head, hlist) {
|
||||
if ((n->net == &init_net) &&
|
||||
(n->portid == inst->peer_portid))
|
||||
if (n->portid == inst->peer_portid)
|
||||
__instance_destroy(inst);
|
||||
}
|
||||
}
|
||||
spin_unlock(&instances_lock);
|
||||
spin_unlock(&q->instances_lock);
|
||||
}
|
||||
return NOTIFY_DONE;
|
||||
}
|
||||
@ -706,11 +717,12 @@ static const struct nla_policy nfqa_verdict_batch_policy[NFQA_MAX+1] = {
|
||||
[NFQA_MARK] = { .type = NLA_U32 },
|
||||
};
|
||||
|
||||
static struct nfqnl_instance *verdict_instance_lookup(u16 queue_num, int nlportid)
|
||||
static struct nfqnl_instance *
|
||||
verdict_instance_lookup(struct nfnl_queue_net *q, u16 queue_num, int nlportid)
|
||||
{
|
||||
struct nfqnl_instance *queue;
|
||||
|
||||
queue = instance_lookup(queue_num);
|
||||
queue = instance_lookup(q, queue_num);
|
||||
if (!queue)
|
||||
return ERR_PTR(-ENODEV);
|
||||
|
||||
@ -754,7 +766,11 @@ nfqnl_recv_verdict_batch(struct sock *ctnl, struct sk_buff *skb,
|
||||
LIST_HEAD(batch_list);
|
||||
u16 queue_num = ntohs(nfmsg->res_id);
|
||||
|
||||
queue = verdict_instance_lookup(queue_num, NETLINK_CB(skb).portid);
|
||||
struct net *net = sock_net(ctnl);
|
||||
struct nfnl_queue_net *q = nfnl_queue_pernet(net);
|
||||
|
||||
queue = verdict_instance_lookup(q, queue_num,
|
||||
NETLINK_CB(skb).portid);
|
||||
if (IS_ERR(queue))
|
||||
return PTR_ERR(queue);
|
||||
|
||||
@ -802,10 +818,13 @@ nfqnl_recv_verdict(struct sock *ctnl, struct sk_buff *skb,
|
||||
enum ip_conntrack_info uninitialized_var(ctinfo);
|
||||
struct nf_conn *ct = NULL;
|
||||
|
||||
queue = instance_lookup(queue_num);
|
||||
if (!queue)
|
||||
struct net *net = sock_net(ctnl);
|
||||
struct nfnl_queue_net *q = nfnl_queue_pernet(net);
|
||||
|
||||
queue = verdict_instance_lookup(queue_num, NETLINK_CB(skb).portid);
|
||||
queue = instance_lookup(q, queue_num);
|
||||
if (!queue)
|
||||
queue = verdict_instance_lookup(q, queue_num,
|
||||
NETLINK_CB(skb).portid);
|
||||
if (IS_ERR(queue))
|
||||
return PTR_ERR(queue);
|
||||
|
||||
@ -869,6 +888,8 @@ nfqnl_recv_config(struct sock *ctnl, struct sk_buff *skb,
|
||||
u_int16_t queue_num = ntohs(nfmsg->res_id);
|
||||
struct nfqnl_instance *queue;
|
||||
struct nfqnl_msg_config_cmd *cmd = NULL;
|
||||
struct net *net = sock_net(ctnl);
|
||||
struct nfnl_queue_net *q = nfnl_queue_pernet(net);
|
||||
int ret = 0;
|
||||
|
||||
if (nfqa[NFQA_CFG_CMD]) {
|
||||
@ -882,7 +903,7 @@ nfqnl_recv_config(struct sock *ctnl, struct sk_buff *skb,
|
||||
}
|
||||
|
||||
rcu_read_lock();
|
||||
queue = instance_lookup(queue_num);
|
||||
queue = instance_lookup(q, queue_num);
|
||||
if (queue && queue->peer_portid != NETLINK_CB(skb).portid) {
|
||||
ret = -EPERM;
|
||||
goto err_out_unlock;
|
||||
@ -895,7 +916,8 @@ nfqnl_recv_config(struct sock *ctnl, struct sk_buff *skb,
|
||||
ret = -EBUSY;
|
||||
goto err_out_unlock;
|
||||
}
|
||||
queue = instance_create(queue_num, NETLINK_CB(skb).portid);
|
||||
queue = instance_create(q, queue_num,
|
||||
NETLINK_CB(skb).portid);
|
||||
if (IS_ERR(queue)) {
|
||||
ret = PTR_ERR(queue);
|
||||
goto err_out_unlock;
|
||||
@ -906,7 +928,7 @@ nfqnl_recv_config(struct sock *ctnl, struct sk_buff *skb,
|
||||
ret = -ENODEV;
|
||||
goto err_out_unlock;
|
||||
}
|
||||
instance_destroy(queue);
|
||||
instance_destroy(q, queue);
|
||||
break;
|
||||
case NFQNL_CFG_CMD_PF_BIND:
|
||||
case NFQNL_CFG_CMD_PF_UNBIND:
|
||||
@ -1000,19 +1022,24 @@ static const struct nfnetlink_subsystem nfqnl_subsys = {
|
||||
|
||||
#ifdef CONFIG_PROC_FS
|
||||
struct iter_state {
|
||||
struct seq_net_private p;
|
||||
unsigned int bucket;
|
||||
};
|
||||
|
||||
static struct hlist_node *get_first(struct seq_file *seq)
|
||||
{
|
||||
struct iter_state *st = seq->private;
|
||||
struct net *net;
|
||||
struct nfnl_queue_net *q;
|
||||
|
||||
if (!st)
|
||||
return NULL;
|
||||
|
||||
net = seq_file_net(seq);
|
||||
q = nfnl_queue_pernet(net);
|
||||
for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) {
|
||||
if (!hlist_empty(&instance_table[st->bucket]))
|
||||
return instance_table[st->bucket].first;
|
||||
if (!hlist_empty(&q->instance_table[st->bucket]))
|
||||
return q->instance_table[st->bucket].first;
|
||||
}
|
||||
return NULL;
|
||||
}
|
||||
@ -1020,13 +1047,17 @@ static struct hlist_node *get_first(struct seq_file *seq)
|
||||
static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h)
|
||||
{
|
||||
struct iter_state *st = seq->private;
|
||||
struct net *net = seq_file_net(seq);
|
||||
|
||||
h = h->next;
|
||||
while (!h) {
|
||||
struct nfnl_queue_net *q;
|
||||
|
||||
if (++st->bucket >= INSTANCE_BUCKETS)
|
||||
return NULL;
|
||||
|
||||
h = instance_table[st->bucket].first;
|
||||
q = nfnl_queue_pernet(net);
|
||||
h = q->instance_table[st->bucket].first;
|
||||
}
|
||||
return h;
|
||||
}
|
||||
@ -1042,11 +1073,11 @@ static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos)
|
||||
return pos ? NULL : head;
|
||||
}
|
||||
|
||||
static void *seq_start(struct seq_file *seq, loff_t *pos)
|
||||
__acquires(instances_lock)
|
||||
static void *seq_start(struct seq_file *s, loff_t *pos)
|
||||
__acquires(nfnl_queue_pernet(seq_file_net(s))->instances_lock)
|
||||
{
|
||||
spin_lock(&instances_lock);
|
||||
return get_idx(seq, *pos);
|
||||
spin_lock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock);
|
||||
return get_idx(s, *pos);
|
||||
}
|
||||
|
||||
static void *seq_next(struct seq_file *s, void *v, loff_t *pos)
|
||||
@ -1056,9 +1087,9 @@ static void *seq_next(struct seq_file *s, void *v, loff_t *pos)
|
||||
}
|
||||
|
||||
static void seq_stop(struct seq_file *s, void *v)
|
||||
__releases(instances_lock)
|
||||
__releases(nfnl_queue_pernet(seq_file_net(s))->instances_lock)
|
||||
{
|
||||
spin_unlock(&instances_lock);
|
||||
spin_unlock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock);
|
||||
}
|
||||
|
||||
static int seq_show(struct seq_file *s, void *v)
|
||||
@ -1082,7 +1113,7 @@ static const struct seq_operations nfqnl_seq_ops = {
|
||||
|
||||
static int nfqnl_open(struct inode *inode, struct file *file)
|
||||
{
|
||||
return seq_open_private(file, &nfqnl_seq_ops,
|
||||
return seq_open_net(inode, file, &nfqnl_seq_ops,
|
||||
sizeof(struct iter_state));
|
||||
}
|
||||
|
||||
@ -1091,39 +1122,63 @@ static const struct file_operations nfqnl_file_ops = {
|
||||
.open = nfqnl_open,
|
||||
.read = seq_read,
|
||||
.llseek = seq_lseek,
|
||||
.release = seq_release_private,
|
||||
.release = seq_release_net,
|
||||
};
|
||||
|
||||
#endif /* PROC_FS */
|
||||
|
||||
static int __init nfnetlink_queue_init(void)
|
||||
static int __net_init nfnl_queue_net_init(struct net *net)
|
||||
{
|
||||
int i, status = -ENOMEM;
|
||||
unsigned int i;
|
||||
struct nfnl_queue_net *q = nfnl_queue_pernet(net);
|
||||
|
||||
for (i = 0; i < INSTANCE_BUCKETS; i++)
|
||||
INIT_HLIST_HEAD(&instance_table[i]);
|
||||
INIT_HLIST_HEAD(&q->instance_table[i]);
|
||||
|
||||
spin_lock_init(&q->instances_lock);
|
||||
|
||||
#ifdef CONFIG_PROC_FS
|
||||
if (!proc_create("nfnetlink_queue", 0440,
|
||||
net->nf.proc_netfilter, &nfqnl_file_ops))
|
||||
return -ENOMEM;
|
||||
#endif
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void __net_exit nfnl_queue_net_exit(struct net *net)
|
||||
{
|
||||
remove_proc_entry("nfnetlink_queue", net->nf.proc_netfilter);
|
||||
}
|
||||
|
||||
static struct pernet_operations nfnl_queue_net_ops = {
|
||||
.init = nfnl_queue_net_init,
|
||||
.exit = nfnl_queue_net_exit,
|
||||
.id = &nfnl_queue_net_id,
|
||||
.size = sizeof(struct nfnl_queue_net),
|
||||
};
|
||||
|
||||
static int __init nfnetlink_queue_init(void)
|
||||
{
|
||||
int status = -ENOMEM;
|
||||
|
||||
netlink_register_notifier(&nfqnl_rtnl_notifier);
|
||||
status = nfnetlink_subsys_register(&nfqnl_subsys);
|
||||
if (status < 0) {
|
||||
printk(KERN_ERR "nf_queue: failed to create netlink socket\n");
|
||||
pr_err("nf_queue: failed to create netlink socket\n");
|
||||
goto cleanup_netlink_notifier;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_PROC_FS
|
||||
if (!proc_create("nfnetlink_queue", 0440,
|
||||
proc_net_netfilter, &nfqnl_file_ops))
|
||||
status = register_pernet_subsys(&nfnl_queue_net_ops);
|
||||
if (status < 0) {
|
||||
pr_err("nf_queue: failed to register pernet ops\n");
|
||||
goto cleanup_subsys;
|
||||
#endif
|
||||
|
||||
}
|
||||
register_netdevice_notifier(&nfqnl_dev_notifier);
|
||||
nf_register_queue_handler(&nfqh);
|
||||
return status;
|
||||
|
||||
#ifdef CONFIG_PROC_FS
|
||||
cleanup_subsys:
|
||||
nfnetlink_subsys_unregister(&nfqnl_subsys);
|
||||
#endif
|
||||
cleanup_netlink_notifier:
|
||||
netlink_unregister_notifier(&nfqnl_rtnl_notifier);
|
||||
return status;
|
||||
@ -1133,9 +1188,7 @@ static void __exit nfnetlink_queue_fini(void)
|
||||
{
|
||||
nf_unregister_queue_handler();
|
||||
unregister_netdevice_notifier(&nfqnl_dev_notifier);
|
||||
#ifdef CONFIG_PROC_FS
|
||||
remove_proc_entry("nfnetlink_queue", proc_net_netfilter);
|
||||
#endif
|
||||
unregister_pernet_subsys(&nfnl_queue_net_ops);
|
||||
nfnetlink_subsys_unregister(&nfqnl_subsys);
|
||||
netlink_unregister_notifier(&nfqnl_rtnl_notifier);
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user