+ mutex_unlock(&xt[af].mutex);
+}
+
+static int xt_table_seq_show(struct seq_file *seq, void *v)
+{
+ struct xt_table *table = list_entry(v, struct xt_table, list);
+
+ if (strlen(table->name))
+ return seq_printf(seq, "%s\n", table->name);
+ else
+ return 0;
+}
+
+static const struct seq_operations xt_table_seq_ops = {
+ .start = xt_table_seq_start,
+ .next = xt_table_seq_next,
+ .stop = xt_table_seq_stop,
+ .show = xt_table_seq_show,
+};
+
+static int xt_table_open(struct inode *inode, struct file *file)
+{
+ int ret;
+ struct xt_names_priv *priv;
+
+ ret = seq_open_net(inode, file, &xt_table_seq_ops,
+ sizeof(struct xt_names_priv));
+ if (!ret) {
+ priv = ((struct seq_file *)file->private_data)->private;
+ priv->af = (unsigned long)PDE(inode)->data;
+ }
+ return ret;
+}
+
+static const struct file_operations xt_table_ops = {
+ .owner = THIS_MODULE,
+ .open = xt_table_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release_net,
+};
+
+/*
+ * Traverse state for ip{,6}_{tables,matches} for helping crossing
+ * the multi-AF mutexes.
+ */
+struct nf_mttg_trav {
+ struct list_head *head, *curr;
+ uint8_t class, nfproto;
+};
+
+enum {
+ MTTG_TRAV_INIT,
+ MTTG_TRAV_NFP_UNSPEC,
+ MTTG_TRAV_NFP_SPEC,
+ MTTG_TRAV_DONE,
+};
+
+static void *xt_mttg_seq_next(struct seq_file *seq, void *v, loff_t *ppos,
+ bool is_target)
+{
+ static const uint8_t next_class[] = {
+ [MTTG_TRAV_NFP_UNSPEC] = MTTG_TRAV_NFP_SPEC,
+ [MTTG_TRAV_NFP_SPEC] = MTTG_TRAV_DONE,
+ };
+ struct nf_mttg_trav *trav = seq->private;
+
+ switch (trav->class) {
+ case MTTG_TRAV_INIT:
+ trav->class = MTTG_TRAV_NFP_UNSPEC;
+ mutex_lock(&xt[NFPROTO_UNSPEC].mutex);
+ trav->head = trav->curr = is_target ?
+ &xt[NFPROTO_UNSPEC].target : &xt[NFPROTO_UNSPEC].match;
+ break;
+ case MTTG_TRAV_NFP_UNSPEC:
+ trav->curr = trav->curr->next;
+ if (trav->curr != trav->head)
+ break;
+ mutex_unlock(&xt[NFPROTO_UNSPEC].mutex);
+ mutex_lock(&xt[trav->nfproto].mutex);
+ trav->head = trav->curr = is_target ?
+ &xt[trav->nfproto].target : &xt[trav->nfproto].match;
+ trav->class = next_class[trav->class];