Phonet: basic net namespace support
[linux-3.10.git] / net / netfilter / nf_conntrack_expect.c
index e405079..3a8a34a 100644 (file)
 #include <net/netfilter/nf_conntrack_helper.h>
 #include <net/netfilter/nf_conntrack_tuple.h>
 
-struct hlist_head *nf_ct_expect_hash __read_mostly;
-EXPORT_SYMBOL_GPL(nf_ct_expect_hash);
-
 unsigned int nf_ct_expect_hsize __read_mostly;
 EXPORT_SYMBOL_GPL(nf_ct_expect_hsize);
 
 static unsigned int nf_ct_expect_hash_rnd __read_mostly;
-static unsigned int nf_ct_expect_count;
 unsigned int nf_ct_expect_max __read_mostly;
 static int nf_ct_expect_hash_rnd_initted __read_mostly;
-static int nf_ct_expect_vmalloc;
 
 static struct kmem_cache *nf_ct_expect_cachep __read_mostly;
 
@@ -46,18 +41,19 @@ static struct kmem_cache *nf_ct_expect_cachep __read_mostly;
 void nf_ct_unlink_expect(struct nf_conntrack_expect *exp)
 {
        struct nf_conn_help *master_help = nfct_help(exp->master);
+       struct net *net = nf_ct_exp_net(exp);
 
        NF_CT_ASSERT(master_help);
        NF_CT_ASSERT(!timer_pending(&exp->timeout));
 
-       hlist_del(&exp->hnode);
-       nf_ct_expect_count--;
+       hlist_del_rcu(&exp->hnode);
+       net->ct.expect_count--;
 
        hlist_del(&exp->lnode);
-       master_help->expecting--;
+       master_help->expecting[exp->class]--;
        nf_ct_expect_put(exp);
 
-       NF_CT_STAT_INC(expect_delete);
+       NF_CT_STAT_INC(net, expect_delete);
 }
 EXPORT_SYMBOL_GPL(nf_ct_unlink_expect);
 
@@ -65,9 +61,9 @@ static void nf_ct_expectation_timed_out(unsigned long ul_expect)
 {
        struct nf_conntrack_expect *exp = (void *)ul_expect;
 
-       write_lock_bh(&nf_conntrack_lock);
+       spin_lock_bh(&nf_conntrack_lock);
        nf_ct_unlink_expect(exp);
-       write_unlock_bh(&nf_conntrack_lock);
+       spin_unlock_bh(&nf_conntrack_lock);
        nf_ct_expect_put(exp);
 }
 
@@ -87,17 +83,17 @@ static unsigned int nf_ct_expect_dst_hash(const struct nf_conntrack_tuple *tuple
 }
 
 struct nf_conntrack_expect *
-__nf_ct_expect_find(const struct nf_conntrack_tuple *tuple)
+__nf_ct_expect_find(struct net *net, const struct nf_conntrack_tuple *tuple)
 {
        struct nf_conntrack_expect *i;
        struct hlist_node *n;
        unsigned int h;
 
-       if (!nf_ct_expect_count)
+       if (!net->ct.expect_count)
                return NULL;
 
        h = nf_ct_expect_dst_hash(tuple);
-       hlist_for_each_entry(i, n, &nf_ct_expect_hash[h], hnode) {
+       hlist_for_each_entry_rcu(i, n, &net->ct.expect_hash[h], hnode) {
                if (nf_ct_tuple_mask_cmp(tuple, &i->tuple, &i->mask))
                        return i;
        }
@@ -107,15 +103,15 @@ EXPORT_SYMBOL_GPL(__nf_ct_expect_find);
 
 /* Just find a expectation corresponding to a tuple. */
 struct nf_conntrack_expect *
-nf_ct_expect_find_get(const struct nf_conntrack_tuple *tuple)
+nf_ct_expect_find_get(struct net *net, const struct nf_conntrack_tuple *tuple)
 {
        struct nf_conntrack_expect *i;
 
-       read_lock_bh(&nf_conntrack_lock);
-       i = __nf_ct_expect_find(tuple);
-       if (i)
-               atomic_inc(&i->use);
-       read_unlock_bh(&nf_conntrack_lock);
+       rcu_read_lock();
+       i = __nf_ct_expect_find(net, tuple);
+       if (i && !atomic_inc_not_zero(&i->use))
+               i = NULL;
+       rcu_read_unlock();
 
        return i;
 }
@@ -124,11 +120,23 @@ EXPORT_SYMBOL_GPL(nf_ct_expect_find_get);
 /* If an expectation for this connection is found, it gets delete from
  * global list then returned. */
 struct nf_conntrack_expect *
-nf_ct_find_expectation(const struct nf_conntrack_tuple *tuple)
+nf_ct_find_expectation(struct net *net, const struct nf_conntrack_tuple *tuple)
 {
-       struct nf_conntrack_expect *exp;
+       struct nf_conntrack_expect *i, *exp = NULL;
+       struct hlist_node *n;
+       unsigned int h;
 
-       exp = __nf_ct_expect_find(tuple);
+       if (!net->ct.expect_count)
+               return NULL;
+
+       h = nf_ct_expect_dst_hash(tuple);
+       hlist_for_each_entry(i, n, &net->ct.expect_hash[h], hnode) {
+               if (!(i->flags & NF_CT_EXPECT_INACTIVE) &&
+                   nf_ct_tuple_mask_cmp(tuple, &i->tuple, &i->mask)) {
+                       exp = i;
+                       break;
+               }
+       }
        if (!exp)
                return NULL;
 
@@ -159,7 +167,7 @@ void nf_ct_remove_expectations(struct nf_conn *ct)
        struct hlist_node *n, *next;
 
        /* Optimization: most connection never expect any others. */
-       if (!help || help->expecting == 0)
+       if (!help)
                return;
 
        hlist_for_each_entry_safe(exp, n, next, &help->expectations, lnode) {
@@ -193,7 +201,7 @@ static inline int expect_clash(const struct nf_conntrack_expect *a,
 static inline int expect_matches(const struct nf_conntrack_expect *a,
                                 const struct nf_conntrack_expect *b)
 {
-       return a->master == b->master
+       return a->master == b->master && a->class == b->class
                && nf_ct_tuple_equal(&a->tuple, &b->tuple)
                && nf_ct_tuple_mask_equal(&a->mask, &b->mask);
 }
@@ -201,12 +209,12 @@ static inline int expect_matches(const struct nf_conntrack_expect *a,
 /* Generally a bad idea to call this: could have matched already. */
 void nf_ct_unexpect_related(struct nf_conntrack_expect *exp)
 {
-       write_lock_bh(&nf_conntrack_lock);
+       spin_lock_bh(&nf_conntrack_lock);
        if (del_timer(&exp->timeout)) {
                nf_ct_unlink_expect(exp);
                nf_ct_expect_put(exp);
        }
-       write_unlock_bh(&nf_conntrack_lock);
+       spin_unlock_bh(&nf_conntrack_lock);
 }
 EXPORT_SYMBOL_GPL(nf_ct_unexpect_related);
 
@@ -223,14 +231,16 @@ struct nf_conntrack_expect *nf_ct_expect_alloc(struct nf_conn *me)
 
        new->master = me;
        atomic_set(&new->use, 1);
+       INIT_RCU_HEAD(&new->rcu);
        return new;
 }
 EXPORT_SYMBOL_GPL(nf_ct_expect_alloc);
 
-void nf_ct_expect_init(struct nf_conntrack_expect *exp, int family,
-                      union nf_inet_addr *saddr,
-                      union nf_inet_addr *daddr,
-                      u_int8_t proto, __be16 *src, __be16 *dst)
+void nf_ct_expect_init(struct nf_conntrack_expect *exp, unsigned int class,
+                      u_int8_t family,
+                      const union nf_inet_addr *saddr,
+                      const union nf_inet_addr *daddr,
+                      u_int8_t proto, const __be16 *src, const __be16 *dst)
 {
        int len;
 
@@ -240,6 +250,7 @@ void nf_ct_expect_init(struct nf_conntrack_expect *exp, int family,
                len = 16;
 
        exp->flags = 0;
+       exp->class = class;
        exp->expectfn = NULL;
        exp->helper = NULL;
        exp->tuple.src.l3num = family;
@@ -278,81 +289,96 @@ void nf_ct_expect_init(struct nf_conntrack_expect *exp, int family,
 }
 EXPORT_SYMBOL_GPL(nf_ct_expect_init);
 
+static void nf_ct_expect_free_rcu(struct rcu_head *head)
+{
+       struct nf_conntrack_expect *exp;
+
+       exp = container_of(head, struct nf_conntrack_expect, rcu);
+       kmem_cache_free(nf_ct_expect_cachep, exp);
+}
+
 void nf_ct_expect_put(struct nf_conntrack_expect *exp)
 {
        if (atomic_dec_and_test(&exp->use))
-               kmem_cache_free(nf_ct_expect_cachep, exp);
+               call_rcu(&exp->rcu, nf_ct_expect_free_rcu);
 }
 EXPORT_SYMBOL_GPL(nf_ct_expect_put);
 
 static void nf_ct_expect_insert(struct nf_conntrack_expect *exp)
 {
        struct nf_conn_help *master_help = nfct_help(exp->master);
+       struct net *net = nf_ct_exp_net(exp);
+       const struct nf_conntrack_expect_policy *p;
        unsigned int h = nf_ct_expect_dst_hash(&exp->tuple);
 
        atomic_inc(&exp->use);
 
        hlist_add_head(&exp->lnode, &master_help->expectations);
-       master_help->expecting++;
+       master_help->expecting[exp->class]++;
 
-       hlist_add_head(&exp->hnode, &nf_ct_expect_hash[h]);
-       nf_ct_expect_count++;
+       hlist_add_head_rcu(&exp->hnode, &net->ct.expect_hash[h]);
+       net->ct.expect_count++;
 
        setup_timer(&exp->timeout, nf_ct_expectation_timed_out,
                    (unsigned long)exp);
-       exp->timeout.expires = jiffies + master_help->helper->timeout * HZ;
+       p = &master_help->helper->expect_policy[exp->class];
+       exp->timeout.expires = jiffies + p->timeout * HZ;
        add_timer(&exp->timeout);
 
        atomic_inc(&exp->use);
-       NF_CT_STAT_INC(expect_create);
+       NF_CT_STAT_INC(net, expect_create);
 }
 
 /* Race with expectations being used means we could have none to find; OK. */
-static void evict_oldest_expect(struct nf_conn *master)
+static void evict_oldest_expect(struct nf_conn *master,
+                               struct nf_conntrack_expect *new)
 {
        struct nf_conn_help *master_help = nfct_help(master);
-       struct nf_conntrack_expect *exp = NULL;
+       struct nf_conntrack_expect *exp, *last = NULL;
        struct hlist_node *n;
 
-       hlist_for_each_entry(exp, n, &master_help->expectations, lnode)
-               ; /* nothing */
+       hlist_for_each_entry(exp, n, &master_help->expectations, lnode) {
+               if (exp->class == new->class)
+                       last = exp;
+       }
 
-       if (exp && del_timer(&exp->timeout)) {
-               nf_ct_unlink_expect(exp);
-               nf_ct_expect_put(exp);
+       if (last && del_timer(&last->timeout)) {
+               nf_ct_unlink_expect(last);
+               nf_ct_expect_put(last);
        }
 }
 
 static inline int refresh_timer(struct nf_conntrack_expect *i)
 {
        struct nf_conn_help *master_help = nfct_help(i->master);
+       const struct nf_conntrack_expect_policy *p;
 
        if (!del_timer(&i->timeout))
                return 0;
 
-       i->timeout.expires = jiffies + master_help->helper->timeout*HZ;
+       p = &master_help->helper->expect_policy[i->class];
+       i->timeout.expires = jiffies + p->timeout * HZ;
        add_timer(&i->timeout);
        return 1;
 }
 
-int nf_ct_expect_related(struct nf_conntrack_expect *expect)
+static inline int __nf_ct_expect_check(struct nf_conntrack_expect *expect)
 {
+       const struct nf_conntrack_expect_policy *p;
        struct nf_conntrack_expect *i;
        struct nf_conn *master = expect->master;
        struct nf_conn_help *master_help = nfct_help(master);
+       struct net *net = nf_ct_exp_net(expect);
        struct hlist_node *n;
        unsigned int h;
-       int ret;
+       int ret = 0;
 
-       NF_CT_ASSERT(master_help);
-
-       write_lock_bh(&nf_conntrack_lock);
        if (!master_help->helper) {
                ret = -ESHUTDOWN;
                goto out;
        }
        h = nf_ct_expect_dst_hash(&expect->tuple);
-       hlist_for_each_entry(i, n, &nf_ct_expect_hash[h], hnode) {
+       hlist_for_each_entry(i, n, &net->ct.expect_hash[h], hnode) {
                if (expect_matches(i, expect)) {
                        /* Refresh timer: if it's dying, ignore.. */
                        if (refresh_timer(i)) {
@@ -365,39 +391,81 @@ int nf_ct_expect_related(struct nf_conntrack_expect *expect)
                }
        }
        /* Will be over limit? */
-       if (master_help->helper->max_expected &&
-           master_help->expecting >= master_help->helper->max_expected)
-               evict_oldest_expect(master);
+       p = &master_help->helper->expect_policy[expect->class];
+       if (p->max_expected &&
+           master_help->expecting[expect->class] >= p->max_expected) {
+               evict_oldest_expect(master, expect);
+               if (master_help->expecting[expect->class] >= p->max_expected) {
+                       ret = -EMFILE;
+                       goto out;
+               }
+       }
 
-       if (nf_ct_expect_count >= nf_ct_expect_max) {
+       if (net->ct.expect_count >= nf_ct_expect_max) {
                if (net_ratelimit())
                        printk(KERN_WARNING
-                              "nf_conntrack: expectation table full");
+                              "nf_conntrack: expectation table full\n");
                ret = -EMFILE;
-               goto out;
        }
+out:
+       return ret;
+}
+
+int nf_ct_expect_related(struct nf_conntrack_expect *expect)
+{
+       int ret;
+
+       spin_lock_bh(&nf_conntrack_lock);
+       ret = __nf_ct_expect_check(expect);
+       if (ret < 0)
+               goto out;
 
        nf_ct_expect_insert(expect);
+       atomic_inc(&expect->use);
+       spin_unlock_bh(&nf_conntrack_lock);
        nf_ct_expect_event(IPEXP_NEW, expect);
-       ret = 0;
+       nf_ct_expect_put(expect);
+       return ret;
 out:
-       write_unlock_bh(&nf_conntrack_lock);
+       spin_unlock_bh(&nf_conntrack_lock);
        return ret;
 }
 EXPORT_SYMBOL_GPL(nf_ct_expect_related);
 
+int nf_ct_expect_related_report(struct nf_conntrack_expect *expect, 
+                               u32 pid, int report)
+{
+       int ret;
+
+       spin_lock_bh(&nf_conntrack_lock);
+       ret = __nf_ct_expect_check(expect);
+       if (ret < 0)
+               goto out;
+       nf_ct_expect_insert(expect);
+out:
+       spin_unlock_bh(&nf_conntrack_lock);
+       if (ret == 0)
+               nf_ct_expect_event_report(IPEXP_NEW, expect, pid, report);
+       return ret;
+}
+EXPORT_SYMBOL_GPL(nf_ct_expect_related_report);
+
 #ifdef CONFIG_PROC_FS
 struct ct_expect_iter_state {
+       struct seq_net_private p;
        unsigned int bucket;
 };
 
 static struct hlist_node *ct_expect_get_first(struct seq_file *seq)
 {
+       struct net *net = seq_file_net(seq);
        struct ct_expect_iter_state *st = seq->private;
+       struct hlist_node *n;
 
        for (st->bucket = 0; st->bucket < nf_ct_expect_hsize; st->bucket++) {
-               if (!hlist_empty(&nf_ct_expect_hash[st->bucket]))
-                       return nf_ct_expect_hash[st->bucket].first;
+               n = rcu_dereference(net->ct.expect_hash[st->bucket].first);
+               if (n)
+                       return n;
        }
        return NULL;
 }
@@ -405,13 +473,14 @@ static struct hlist_node *ct_expect_get_first(struct seq_file *seq)
 static struct hlist_node *ct_expect_get_next(struct seq_file *seq,
                                             struct hlist_node *head)
 {
+       struct net *net = seq_file_net(seq);
        struct ct_expect_iter_state *st = seq->private;
 
-       head = head->next;
+       head = rcu_dereference(head->next);
        while (head == NULL) {
                if (++st->bucket >= nf_ct_expect_hsize)
                        return NULL;
-               head = nf_ct_expect_hash[st->bucket].first;
+               head = rcu_dereference(net->ct.expect_hash[st->bucket].first);
        }
        return head;
 }
@@ -427,9 +496,9 @@ static struct hlist_node *ct_expect_get_idx(struct seq_file *seq, loff_t pos)
 }
 
 static void *exp_seq_start(struct seq_file *seq, loff_t *pos)
-       __acquires(nf_conntrack_lock)
+       __acquires(RCU)
 {
-       read_lock_bh(&nf_conntrack_lock);
+       rcu_read_lock();
        return ct_expect_get_idx(seq, *pos);
 }
 
@@ -440,15 +509,16 @@ static void *exp_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 }
 
 static void exp_seq_stop(struct seq_file *seq, void *v)
-       __releases(nf_conntrack_lock)
+       __releases(RCU)
 {
-       read_unlock_bh(&nf_conntrack_lock);
+       rcu_read_unlock();
 }
 
 static int exp_seq_show(struct seq_file *s, void *v)
 {
        struct nf_conntrack_expect *expect;
        struct hlist_node *n = v;
+       char *delim = "";
 
        expect = hlist_entry(n, struct nf_conntrack_expect, hnode);
 
@@ -464,6 +534,14 @@ static int exp_seq_show(struct seq_file *s, void *v)
                    __nf_ct_l3proto_find(expect->tuple.src.l3num),
                    __nf_ct_l4proto_find(expect->tuple.src.l3num,
                                       expect->tuple.dst.protonum));
+
+       if (expect->flags & NF_CT_EXPECT_PERMANENT) {
+               seq_printf(s, "PERMANENT");
+               delim = ",";
+       }
+       if (expect->flags & NF_CT_EXPECT_INACTIVE)
+               seq_printf(s, "%sINACTIVE", delim);
+
        return seq_putc(s, '\n');
 }
 
@@ -476,7 +554,7 @@ static const struct seq_operations exp_seq_ops = {
 
 static int exp_open(struct inode *inode, struct file *file)
 {
-       return seq_open_private(file, &exp_seq_ops,
+       return seq_open_net(inode, file, &exp_seq_ops,
                        sizeof(struct ct_expect_iter_state));
 }
 
@@ -485,72 +563,79 @@ static const struct file_operations exp_file_ops = {
        .open    = exp_open,
        .read    = seq_read,
        .llseek  = seq_lseek,
-       .release = seq_release_private,
+       .release = seq_release_net,
 };
 #endif /* CONFIG_PROC_FS */
 
-static int __init exp_proc_init(void)
+static int exp_proc_init(struct net *net)
 {
 #ifdef CONFIG_PROC_FS
        struct proc_dir_entry *proc;
 
-       proc = proc_net_fops_create(&init_net, "nf_conntrack_expect", 0440, &exp_file_ops);
+       proc = proc_net_fops_create(net, "nf_conntrack_expect", 0440, &exp_file_ops);
        if (!proc)
                return -ENOMEM;
 #endif /* CONFIG_PROC_FS */
        return 0;
 }
 
-static void exp_proc_remove(void)
+static void exp_proc_remove(struct net *net)
 {
 #ifdef CONFIG_PROC_FS
-       proc_net_remove(&init_net, "nf_conntrack_expect");
+       proc_net_remove(net, "nf_conntrack_expect");
 #endif /* CONFIG_PROC_FS */
 }
 
 module_param_named(expect_hashsize, nf_ct_expect_hsize, uint, 0600);
 
-int __init nf_conntrack_expect_init(void)
+int nf_conntrack_expect_init(struct net *net)
 {
        int err = -ENOMEM;
 
-       if (!nf_ct_expect_hsize) {
-               nf_ct_expect_hsize = nf_conntrack_htable_size / 256;
-               if (!nf_ct_expect_hsize)
-                       nf_ct_expect_hsize = 1;
+       if (net_eq(net, &init_net)) {
+               if (!nf_ct_expect_hsize) {
+                       nf_ct_expect_hsize = nf_conntrack_htable_size / 256;
+                       if (!nf_ct_expect_hsize)
+                               nf_ct_expect_hsize = 1;
+               }
+               nf_ct_expect_max = nf_ct_expect_hsize * 4;
        }
-       nf_ct_expect_max = nf_ct_expect_hsize * 4;
 
-       nf_ct_expect_hash = nf_ct_alloc_hashtable(&nf_ct_expect_hsize,
-                                                 &nf_ct_expect_vmalloc);
-       if (nf_ct_expect_hash == NULL)
+       net->ct.expect_count = 0;
+       net->ct.expect_hash = nf_ct_alloc_hashtable(&nf_ct_expect_hsize,
+                                                 &net->ct.expect_vmalloc);
+       if (net->ct.expect_hash == NULL)
                goto err1;
 
-       nf_ct_expect_cachep = kmem_cache_create("nf_conntrack_expect",
+       if (net_eq(net, &init_net)) {
+               nf_ct_expect_cachep = kmem_cache_create("nf_conntrack_expect",
                                        sizeof(struct nf_conntrack_expect),
                                        0, 0, NULL);
-       if (!nf_ct_expect_cachep)
-               goto err2;
+               if (!nf_ct_expect_cachep)
+                       goto err2;
+       }
 
-       err = exp_proc_init();
+       err = exp_proc_init(net);
        if (err < 0)
                goto err3;
 
        return 0;
 
 err3:
-       nf_ct_free_hashtable(nf_ct_expect_hash, nf_ct_expect_vmalloc,
-                            nf_ct_expect_hsize);
+       if (net_eq(net, &init_net))
+               kmem_cache_destroy(nf_ct_expect_cachep);
 err2:
-       kmem_cache_destroy(nf_ct_expect_cachep);
+       nf_ct_free_hashtable(net->ct.expect_hash, net->ct.expect_vmalloc,
+                            nf_ct_expect_hsize);
 err1:
        return err;
 }
 
-void nf_conntrack_expect_fini(void)
+void nf_conntrack_expect_fini(struct net *net)
 {
-       exp_proc_remove();
-       kmem_cache_destroy(nf_ct_expect_cachep);
-       nf_ct_free_hashtable(nf_ct_expect_hash, nf_ct_expect_vmalloc,
+       exp_proc_remove(net);
+       if (net_eq(net, &init_net))
+               kmem_cache_destroy(nf_ct_expect_cachep);
+       nf_ct_free_hashtable(net->ct.expect_hash, net->ct.expect_vmalloc,
                             nf_ct_expect_hsize);
 }