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Diffstat (limited to 'net/netlink/af_netlink.c')
-rw-r--r--net/netlink/af_netlink.c130
1 files changed, 64 insertions, 66 deletions
diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index a36777b7cfb6..155854802d44 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -2886,99 +2886,97 @@ EXPORT_SYMBOL(nlmsg_notify);
#ifdef CONFIG_PROC_FS
struct nl_seq_iter {
struct seq_net_private p;
+ struct rhashtable_iter hti;
int link;
- int hash_idx;
};
-static struct sock *netlink_seq_socket_idx(struct seq_file *seq, loff_t pos)
+static int netlink_walk_start(struct nl_seq_iter *iter)
{
- struct nl_seq_iter *iter = seq->private;
- int i, j;
- struct netlink_sock *nlk;
- struct sock *s;
- loff_t off = 0;
-
- for (i = 0; i < MAX_LINKS; i++) {
- struct rhashtable *ht = &nl_table[i].hash;
- const struct bucket_table *tbl = rht_dereference_rcu(ht->tbl, ht);
-
- for (j = 0; j < tbl->size; j++) {
- struct rhash_head *node;
-
- rht_for_each_entry_rcu(nlk, node, tbl, j, node) {
- s = (struct sock *)nlk;
+ int err;
- if (sock_net(s) != seq_file_net(seq))
- continue;
- if (off == pos) {
- iter->link = i;
- iter->hash_idx = j;
- return s;
- }
- ++off;
- }
- }
+ err = rhashtable_walk_init(&nl_table[iter->link].hash, &iter->hti);
+ if (err) {
+ iter->link = MAX_LINKS;
+ return err;
}
- return NULL;
+
+ err = rhashtable_walk_start(&iter->hti);
+ return err == -EAGAIN ? 0 : err;
}
-static void *netlink_seq_start(struct seq_file *seq, loff_t *pos)
- __acquires(RCU)
+static void netlink_walk_stop(struct nl_seq_iter *iter)
{
- rcu_read_lock();
- return *pos ? netlink_seq_socket_idx(seq, *pos - 1) : SEQ_START_TOKEN;
+ rhashtable_walk_stop(&iter->hti);
+ rhashtable_walk_exit(&iter->hti);
}
-static void *netlink_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+static void *__netlink_seq_next(struct seq_file *seq)
{
- struct rhashtable *ht;
- const struct bucket_table *tbl;
- struct rhash_head *node;
+ struct nl_seq_iter *iter = seq->private;
struct netlink_sock *nlk;
- struct nl_seq_iter *iter;
- struct net *net;
- int i, j;
- ++*pos;
+ do {
+ for (;;) {
+ int err;
- if (v == SEQ_START_TOKEN)
- return netlink_seq_socket_idx(seq, 0);
+ nlk = rhashtable_walk_next(&iter->hti);
- net = seq_file_net(seq);
- iter = seq->private;
- nlk = v;
+ if (IS_ERR(nlk)) {
+ if (PTR_ERR(nlk) == -EAGAIN)
+ continue;
- i = iter->link;
- ht = &nl_table[i].hash;
- tbl = rht_dereference_rcu(ht->tbl, ht);
- rht_for_each_entry_rcu_continue(nlk, node, nlk->node.next, tbl, iter->hash_idx, node)
- if (net_eq(sock_net((struct sock *)nlk), net))
- return nlk;
+ return nlk;
+ }
- j = iter->hash_idx + 1;
+ if (nlk)
+ break;
- do {
+ netlink_walk_stop(iter);
+ if (++iter->link >= MAX_LINKS)
+ return NULL;
- for (; j < tbl->size; j++) {
- rht_for_each_entry_rcu(nlk, node, tbl, j, node) {
- if (net_eq(sock_net((struct sock *)nlk), net)) {
- iter->link = i;
- iter->hash_idx = j;
- return nlk;
- }
- }
+ err = netlink_walk_start(iter);
+ if (err)
+ return ERR_PTR(err);
}
+ } while (sock_net(&nlk->sk) != seq_file_net(seq));
- j = 0;
- } while (++i < MAX_LINKS);
+ return nlk;
+}
- return NULL;
+static void *netlink_seq_start(struct seq_file *seq, loff_t *posp)
+{
+ struct nl_seq_iter *iter = seq->private;
+ void *obj = SEQ_START_TOKEN;
+ loff_t pos;
+ int err;
+
+ iter->link = 0;
+
+ err = netlink_walk_start(iter);
+ if (err)
+ return ERR_PTR(err);
+
+ for (pos = *posp; pos && obj && !IS_ERR(obj); pos--)
+ obj = __netlink_seq_next(seq);
+
+ return obj;
+}
+
+static void *netlink_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+ ++*pos;
+ return __netlink_seq_next(seq);
}
static void netlink_seq_stop(struct seq_file *seq, void *v)
- __releases(RCU)
{
- rcu_read_unlock();
+ struct nl_seq_iter *iter = seq->private;
+
+ if (iter->link >= MAX_LINKS)
+ return;
+
+ netlink_walk_stop(iter);
}