[NETFILTER]: nf_conntrack_expect: convert proc functions to hash

Convert from the global expectation list to the hash table.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4_compat.c b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4_compat.c
index 12d6a63..ab8e4c6 100644 (file)
--- a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4_compat.c
+++ b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4_compat.c
@@ -207,47 +207,68 @@ static const struct file_operations ct_file_ops = {
 };
 
 /* expects */
-static void *exp_seq_start(struct seq_file *s, loff_t *pos)
+struct ct_expect_iter_state {
+       unsigned int bucket;
+};
+
+static struct hlist_node *ct_expect_get_first(struct seq_file *seq)
 {
-       struct list_head *e = &nf_ct_expect_list;
-       loff_t i;
+       struct ct_expect_iter_state *st = seq->private;
 
-       /* strange seq_file api calls stop even if we fail,
-        * thus we need to grab lock since stop unlocks */
-       read_lock_bh(&nf_conntrack_lock);
+       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;
+       }
+       return NULL;
+}
 
-       if (list_empty(e))
-               return NULL;
+static struct hlist_node *ct_expect_get_next(struct seq_file *seq,
+                                            struct hlist_node *head)
+{
+       struct ct_expect_iter_state *st = seq->private;
 
-       for (i = 0; i <= *pos; i++) {
-               e = e->next;
-               if (e == &nf_ct_expect_list)
+       head = head->next;
+       while (head == NULL) {
+               if (++st->bucket >= nf_ct_expect_hsize)
                        return NULL;
+               head = nf_ct_expect_hash[st->bucket].first;
        }
-       return e;
+       return head;
 }
 
-static void *exp_seq_next(struct seq_file *s, void *v, loff_t *pos)
+static struct hlist_node *ct_expect_get_idx(struct seq_file *seq, loff_t pos)
 {
-       struct list_head *e = v;
+       struct hlist_node *head = ct_expect_get_first(seq);
 
-       ++*pos;
-       e = e->next;
+       if (head)
+               while (pos && (head = ct_expect_get_next(seq, head)))
+                       pos--;
+       return pos ? NULL : head;
+}
 
-       if (e == &nf_ct_expect_list)
-               return NULL;
+static void *exp_seq_start(struct seq_file *seq, loff_t *pos)
+{
+       read_lock_bh(&nf_conntrack_lock);
+       return ct_expect_get_idx(seq, *pos);
+}
 
-       return e;
+static void *exp_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+       (*pos)++;
+       return ct_expect_get_next(seq, v);
 }
 
-static void exp_seq_stop(struct seq_file *s, void *v)
+static void exp_seq_stop(struct seq_file *seq, void *v)
 {
        read_unlock_bh(&nf_conntrack_lock);
 }
 
 static int exp_seq_show(struct seq_file *s, void *v)
 {
-       struct nf_conntrack_expect *exp = v;
+       struct nf_conntrack_expect *exp;
+       struct hlist_node *n = v;
+
+       exp = hlist_entry(n, struct nf_conntrack_expect, hnode);
 
        if (exp->tuple.src.l3num != AF_INET)
                return 0;
@@ -276,7 +297,23 @@ static struct seq_operations exp_seq_ops = {
 
 static int exp_open(struct inode *inode, struct file *file)
 {
-       return seq_open(file, &exp_seq_ops);
+       struct seq_file *seq;
+       struct ct_expect_iter_state *st;
+       int ret;
+
+       st = kmalloc(sizeof(struct ct_expect_iter_state), GFP_KERNEL);
+       if (st == NULL)
+               return -ENOMEM;
+       ret = seq_open(file, &exp_seq_ops);
+       if (ret)
+               goto out_free;
+       seq          = file->private_data;
+       seq->private = st;
+       memset(st, 0, sizeof(struct ct_expect_iter_state));
+       return ret;
+out_free:
+       kfree(st);
+       return ret;
 }
 
 static const struct file_operations ip_exp_file_ops = {
@@ -284,7 +321,7 @@ static const struct file_operations ip_exp_file_ops = {
        .open    = exp_open,
        .read    = seq_read,
        .llseek  = seq_lseek,
-       .release = seq_release
+       .release = seq_release_private,
 };
 
 static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos)

diff --git a/net/netfilter/nf_conntrack_expect.c b/net/netfilter/nf_conntrack_expect.c
index 0696f87..c5006b0 100644 (file)
--- a/net/netfilter/nf_conntrack_expect.c
+++ b/net/netfilter/nf_conntrack_expect.c
@@ -377,47 +377,68 @@ out:
 EXPORT_SYMBOL_GPL(nf_ct_expect_related);
 
 #ifdef CONFIG_PROC_FS
-static void *exp_seq_start(struct seq_file *s, loff_t *pos)
+struct ct_expect_iter_state {
+       unsigned int bucket;
+};
+
+static struct hlist_node *ct_expect_get_first(struct seq_file *seq)
 {
-       struct list_head *e = &nf_ct_expect_list;
-       loff_t i;
+       struct ct_expect_iter_state *st = seq->private;
 
-       /* strange seq_file api calls stop even if we fail,
-        * thus we need to grab lock since stop unlocks */
-       read_lock_bh(&nf_conntrack_lock);
+       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;
+       }
+       return NULL;
+}
 
-       if (list_empty(e))
-               return NULL;
+static struct hlist_node *ct_expect_get_next(struct seq_file *seq,
+                                            struct hlist_node *head)
+{
+       struct ct_expect_iter_state *st = seq->private;
 
-       for (i = 0; i <= *pos; i++) {
-               e = e->next;
-               if (e == &nf_ct_expect_list)
+       head = head->next;
+       while (head == NULL) {
+               if (++st->bucket >= nf_ct_expect_hsize)
                        return NULL;
+               head = nf_ct_expect_hash[st->bucket].first;
        }
-       return e;
+       return head;
 }
 
-static void *exp_seq_next(struct seq_file *s, void *v, loff_t *pos)
+static struct hlist_node *ct_expect_get_idx(struct seq_file *seq, loff_t pos)
 {
-       struct list_head *e = v;
+       struct hlist_node *head = ct_expect_get_first(seq);
 
-       ++*pos;
-       e = e->next;
+       if (head)
+               while (pos && (head = ct_expect_get_next(seq, head)))
+                       pos--;
+       return pos ? NULL : head;
+}
 
-       if (e == &nf_ct_expect_list)
-               return NULL;
+static void *exp_seq_start(struct seq_file *seq, loff_t *pos)
+{
+       read_lock_bh(&nf_conntrack_lock);
+       return ct_expect_get_idx(seq, *pos);
+}
 
-       return e;
+static void *exp_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+       (*pos)++;
+       return ct_expect_get_next(seq, v);
 }
 
-static void exp_seq_stop(struct seq_file *s, void *v)
+static void exp_seq_stop(struct seq_file *seq, void *v)
 {
        read_unlock_bh(&nf_conntrack_lock);
 }
 
 static int exp_seq_show(struct seq_file *s, void *v)
 {
-       struct nf_conntrack_expect *expect = v;
+       struct nf_conntrack_expect *expect;
+       struct hlist_node *n = v;
+
+       expect = hlist_entry(n, struct nf_conntrack_expect, hnode);
 
        if (expect->timeout.function)
                seq_printf(s, "%ld ", timer_pending(&expect->timeout)
@@ -443,15 +464,31 @@ static struct seq_operations exp_seq_ops = {
 
 static int exp_open(struct inode *inode, struct file *file)
 {
-       return seq_open(file, &exp_seq_ops);
+       struct seq_file *seq;
+       struct ct_expect_iter_state *st;
+       int ret;
+
+       st = kmalloc(sizeof(struct ct_expect_iter_state), GFP_KERNEL);
+       if (st == NULL)
+               return -ENOMEM;
+       ret = seq_open(file, &exp_seq_ops);
+       if (ret)
+               goto out_free;
+       seq          = file->private_data;
+       seq->private = st;
+       memset(st, 0, sizeof(struct ct_expect_iter_state));
+       return ret;
+out_free:
+       kfree(st);
+       return ret;
 }
 
-const struct file_operations exp_file_ops = {
+static const struct file_operations exp_file_ops = {
        .owner   = THIS_MODULE,
        .open    = exp_open,
        .read    = seq_read,
        .llseek  = seq_lseek,
-       .release = seq_release
+       .release = seq_release_private,
 };
 #endif /* CONFIG_PROC_FS */