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@@ -827,59 +827,143 @@ static const struct file_operations xt_table_ops = {
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.release = seq_release_net,
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};
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-static void *xt_match_seq_start(struct seq_file *seq, loff_t *pos)
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+/*
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+ * Traverse state for ip{,6}_{tables,matches} for helping crossing
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+ * the multi-AF mutexes.
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+ */
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+struct nf_mttg_trav {
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+ struct list_head *head, *curr;
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+ uint8_t class, nfproto;
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+};
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+
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+enum {
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+ MTTG_TRAV_INIT,
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+ MTTG_TRAV_NFP_UNSPEC,
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+ MTTG_TRAV_NFP_SPEC,
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+ MTTG_TRAV_DONE,
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+};
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+
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+static void *xt_mttg_seq_next(struct seq_file *seq, void *v, loff_t *ppos,
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+ bool is_target)
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{
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- struct proc_dir_entry *pde = (struct proc_dir_entry *)seq->private;
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- u_int16_t af = (unsigned long)pde->data;
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+ static const uint8_t next_class[] = {
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+ [MTTG_TRAV_NFP_UNSPEC] = MTTG_TRAV_NFP_SPEC,
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+ [MTTG_TRAV_NFP_SPEC] = MTTG_TRAV_DONE,
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+ };
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+ struct nf_mttg_trav *trav = seq->private;
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+
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+ switch (trav->class) {
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+ case MTTG_TRAV_INIT:
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+ trav->class = MTTG_TRAV_NFP_UNSPEC;
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+ mutex_lock(&xt[NFPROTO_UNSPEC].mutex);
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+ trav->head = trav->curr = is_target ?
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+ &xt[NFPROTO_UNSPEC].target : &xt[NFPROTO_UNSPEC].match;
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+ break;
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+ case MTTG_TRAV_NFP_UNSPEC:
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+ trav->curr = trav->curr->next;
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+ if (trav->curr != trav->head)
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+ break;
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+ mutex_unlock(&xt[NFPROTO_UNSPEC].mutex);
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+ mutex_lock(&xt[trav->nfproto].mutex);
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+ trav->head = trav->curr = is_target ?
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+ &xt[trav->nfproto].target : &xt[trav->nfproto].match;
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+ trav->class = next_class[trav->class];
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+ break;
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+ case MTTG_TRAV_NFP_SPEC:
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+ trav->curr = trav->curr->next;
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+ if (trav->curr != trav->head)
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+ break;
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+ /* fallthru, _stop will unlock */
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+ default:
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+ return NULL;
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+ }
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- mutex_lock(&xt[af].mutex);
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- return seq_list_start(&xt[af].match, *pos);
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+ if (ppos != NULL)
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+ ++*ppos;
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+ return trav;
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}
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-static void *xt_match_seq_next(struct seq_file *seq, void *v, loff_t *pos)
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+static void *xt_mttg_seq_start(struct seq_file *seq, loff_t *pos,
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+ bool is_target)
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{
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- struct proc_dir_entry *pde = (struct proc_dir_entry *)seq->private;
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- u_int16_t af = (unsigned long)pde->data;
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+ struct nf_mttg_trav *trav = seq->private;
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+ unsigned int j;
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- return seq_list_next(v, &xt[af].match, pos);
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+ trav->class = MTTG_TRAV_INIT;
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+ for (j = 0; j < *pos; ++j)
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+ if (xt_mttg_seq_next(seq, NULL, NULL, is_target) == NULL)
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+ return NULL;
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+ return trav;
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}
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-static void xt_match_seq_stop(struct seq_file *seq, void *v)
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+static void xt_mttg_seq_stop(struct seq_file *seq, void *v)
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{
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- struct proc_dir_entry *pde = seq->private;
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- u_int16_t af = (unsigned long)pde->data;
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+ struct nf_mttg_trav *trav = seq->private;
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+
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+ switch (trav->class) {
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+ case MTTG_TRAV_NFP_UNSPEC:
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+ mutex_unlock(&xt[NFPROTO_UNSPEC].mutex);
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+ break;
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+ case MTTG_TRAV_NFP_SPEC:
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+ mutex_unlock(&xt[trav->nfproto].mutex);
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+ break;
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+ }
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+}
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- mutex_unlock(&xt[af].mutex);
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+static void *xt_match_seq_start(struct seq_file *seq, loff_t *pos)
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+{
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+ return xt_mttg_seq_start(seq, pos, false);
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}
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-static int xt_match_seq_show(struct seq_file *seq, void *v)
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+static void *xt_match_seq_next(struct seq_file *seq, void *v, loff_t *ppos)
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{
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- struct xt_match *match = list_entry(v, struct xt_match, list);
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+ return xt_mttg_seq_next(seq, v, ppos, false);
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+}
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- if (strlen(match->name))
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- return seq_printf(seq, "%s\n", match->name);
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- else
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- return 0;
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+static int xt_match_seq_show(struct seq_file *seq, void *v)
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+{
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+ const struct nf_mttg_trav *trav = seq->private;
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+ const struct xt_match *match;
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+
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+ switch (trav->class) {
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+ case MTTG_TRAV_NFP_UNSPEC:
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+ case MTTG_TRAV_NFP_SPEC:
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+ if (trav->curr == trav->head)
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+ return 0;
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+ match = list_entry(trav->curr, struct xt_match, list);
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+ return (*match->name == '\0') ? 0 :
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+ seq_printf(seq, "%s\n", match->name);
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+ }
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+ return 0;
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}
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static const struct seq_operations xt_match_seq_ops = {
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.start = xt_match_seq_start,
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.next = xt_match_seq_next,
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- .stop = xt_match_seq_stop,
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+ .stop = xt_mttg_seq_stop,
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.show = xt_match_seq_show,
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};
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static int xt_match_open(struct inode *inode, struct file *file)
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{
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+ struct seq_file *seq;
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+ struct nf_mttg_trav *trav;
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int ret;
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- ret = seq_open(file, &xt_match_seq_ops);
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- if (!ret) {
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- struct seq_file *seq = file->private_data;
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+ trav = kmalloc(sizeof(*trav), GFP_KERNEL);
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+ if (trav == NULL)
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+ return -ENOMEM;
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- seq->private = PDE(inode);
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+ ret = seq_open(file, &xt_match_seq_ops);
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+ if (ret < 0) {
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+ kfree(trav);
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+ return ret;
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}
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- return ret;
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+
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+ seq = file->private_data;
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+ seq->private = trav;
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+ trav->nfproto = (unsigned long)PDE(inode)->data;
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+ return 0;
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}
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static const struct file_operations xt_match_ops = {
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@@ -887,62 +971,63 @@ static const struct file_operations xt_match_ops = {
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.open = xt_match_open,
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.read = seq_read,
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.llseek = seq_lseek,
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- .release = seq_release,
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+ .release = seq_release_private,
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};
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static void *xt_target_seq_start(struct seq_file *seq, loff_t *pos)
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{
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- struct proc_dir_entry *pde = (struct proc_dir_entry *)seq->private;
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- u_int16_t af = (unsigned long)pde->data;
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-
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- mutex_lock(&xt[af].mutex);
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- return seq_list_start(&xt[af].target, *pos);
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+ return xt_mttg_seq_start(seq, pos, true);
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}
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-static void *xt_target_seq_next(struct seq_file *seq, void *v, loff_t *pos)
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+static void *xt_target_seq_next(struct seq_file *seq, void *v, loff_t *ppos)
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{
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- struct proc_dir_entry *pde = (struct proc_dir_entry *)seq->private;
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- u_int16_t af = (unsigned long)pde->data;
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-
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- return seq_list_next(v, &xt[af].target, pos);
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-}
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-
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-static void xt_target_seq_stop(struct seq_file *seq, void *v)
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-{
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- struct proc_dir_entry *pde = seq->private;
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- u_int16_t af = (unsigned long)pde->data;
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-
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- mutex_unlock(&xt[af].mutex);
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+ return xt_mttg_seq_next(seq, v, ppos, true);
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}
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static int xt_target_seq_show(struct seq_file *seq, void *v)
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{
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- struct xt_target *target = list_entry(v, struct xt_target, list);
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-
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- if (strlen(target->name))
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- return seq_printf(seq, "%s\n", target->name);
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- else
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- return 0;
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+ const struct nf_mttg_trav *trav = seq->private;
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+ const struct xt_target *target;
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+
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+ switch (trav->class) {
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+ case MTTG_TRAV_NFP_UNSPEC:
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+ case MTTG_TRAV_NFP_SPEC:
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+ if (trav->curr == trav->head)
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+ return 0;
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+ target = list_entry(trav->curr, struct xt_target, list);
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+ return (*target->name == '\0') ? 0 :
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+ seq_printf(seq, "%s\n", target->name);
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+ }
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+ return 0;
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}
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static const struct seq_operations xt_target_seq_ops = {
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.start = xt_target_seq_start,
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.next = xt_target_seq_next,
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- .stop = xt_target_seq_stop,
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+ .stop = xt_mttg_seq_stop,
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.show = xt_target_seq_show,
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};
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static int xt_target_open(struct inode *inode, struct file *file)
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{
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+ struct seq_file *seq;
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+ struct nf_mttg_trav *trav;
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int ret;
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- ret = seq_open(file, &xt_target_seq_ops);
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- if (!ret) {
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- struct seq_file *seq = file->private_data;
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+ trav = kmalloc(sizeof(*trav), GFP_KERNEL);
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+ if (trav == NULL)
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+ return -ENOMEM;
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- seq->private = PDE(inode);
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+ ret = seq_open(file, &xt_target_seq_ops);
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+ if (ret < 0) {
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+ kfree(trav);
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+ return ret;
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}
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- return ret;
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+
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+ seq = file->private_data;
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+ seq->private = trav;
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+ trav->nfproto = (unsigned long)PDE(inode)->data;
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+ return 0;
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}
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static const struct file_operations xt_target_ops = {
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@@ -950,7 +1035,7 @@ static const struct file_operations xt_target_ops = {
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.open = xt_target_open,
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.read = seq_read,
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.llseek = seq_lseek,
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- .release = seq_release,
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+ .release = seq_release_private,
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};
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#define FORMAT_TABLES "_tables_names"
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