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Commit eb132205 authored by Jan Engelhardt's avatar Jan Engelhardt Committed by Patrick McHardy
Browse files

netfilter: make proc/net/ip* print names from foreign NFPROTO 



When extensions were moved to the NFPROTO_UNSPEC wildcard in
ab4f21e6, they disappeared from the
procfs files.

Signed-off-by: default avatarJan Engelhardt <jengelh@medozas.de>
Signed-off-by: default avatarPatrick McHardy <kaber@trash.net>
parent 5962fc6d

net/netfilter/x_tables.c

+142 −57
Original line number Diff line number Diff line
@@ -827,130 +827,215 @@ static const struct file_operations xt_table_ops = { 
	.release = seq_release_net,

};



static void *xt_match_seq_start(struct seq_file *seq, loff_t *pos)

/*

 * 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)

{

	struct proc_dir_entry *pde = (struct proc_dir_entry *)seq->private;

	u_int16_t af = (unsigned long)pde->data;

	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];

		break;

	case MTTG_TRAV_NFP_SPEC:

		trav->curr = trav->curr->next;

		if (trav->curr != trav->head)

			break;

		/* fallthru, _stop will unlock */

	default:

		return NULL;

	}



	mutex_lock(&xt[af].mutex);

	return seq_list_start(&xt[af].match, *pos);

	if (ppos != NULL)

		++*ppos;

	return trav;

}



static void *xt_match_seq_next(struct seq_file *seq, void *v, loff_t *pos)

static void *xt_mttg_seq_start(struct seq_file *seq, loff_t *pos,

    bool is_target)

{

	struct proc_dir_entry *pde = (struct proc_dir_entry *)seq->private;

	u_int16_t af = (unsigned long)pde->data;

	struct nf_mttg_trav *trav = seq->private;

	unsigned int j;



	return seq_list_next(v, &xt[af].match, pos);

	trav->class = MTTG_TRAV_INIT;

	for (j = 0; j < *pos; ++j)

		if (xt_mttg_seq_next(seq, NULL, NULL, is_target) == NULL)

			return NULL;

	return trav;

}



static void xt_match_seq_stop(struct seq_file *seq, void *v)

static void xt_mttg_seq_stop(struct seq_file *seq, void *v)

{

	struct proc_dir_entry *pde = seq->private;

	u_int16_t af = (unsigned long)pde->data;

	struct nf_mttg_trav *trav = seq->private;



	mutex_unlock(&xt[af].mutex);

	switch (trav->class) {

	case MTTG_TRAV_NFP_UNSPEC:

		mutex_unlock(&xt[NFPROTO_UNSPEC].mutex);

		break;

	case MTTG_TRAV_NFP_SPEC:

		mutex_unlock(&xt[trav->nfproto].mutex);

		break;

	}

}



static void *xt_match_seq_start(struct seq_file *seq, loff_t *pos)

{

	return xt_mttg_seq_start(seq, pos, false);

}



static void *xt_match_seq_next(struct seq_file *seq, void *v, loff_t *ppos)

{

	return xt_mttg_seq_next(seq, v, ppos, false);

}



static int xt_match_seq_show(struct seq_file *seq, void *v)

{

	struct xt_match *match = list_entry(v, struct xt_match, list);

	const struct nf_mttg_trav *trav = seq->private;

	const struct xt_match *match;



	if (strlen(match->name))

		return seq_printf(seq, "%s\n", match->name);

	else

	switch (trav->class) {

	case MTTG_TRAV_NFP_UNSPEC:

	case MTTG_TRAV_NFP_SPEC:

		if (trav->curr == trav->head)

			return 0;

		match = list_entry(trav->curr, struct xt_match, list);

		return (*match->name == '\0') ? 0 :

		       seq_printf(seq, "%s\n", match->name);

	}

	return 0;

}



static const struct seq_operations xt_match_seq_ops = {

	.start	= xt_match_seq_start,

	.next	= xt_match_seq_next,

	.stop	= xt_match_seq_stop,

	.stop	= xt_mttg_seq_stop,

	.show	= xt_match_seq_show,

};



static int xt_match_open(struct inode *inode, struct file *file)

{

	struct seq_file *seq;

	struct nf_mttg_trav *trav;

	int ret;



	ret = seq_open(file, &xt_match_seq_ops);

	if (!ret) {

		struct seq_file *seq = file->private_data;

	trav = kmalloc(sizeof(*trav), GFP_KERNEL);

	if (trav == NULL)

		return -ENOMEM;



		seq->private = PDE(inode);

	}

	ret = seq_open(file, &xt_match_seq_ops);

	if (ret < 0) {

		kfree(trav);

		return ret;

	}



	seq = file->private_data;

	seq->private = trav;

	trav->nfproto = (unsigned long)PDE(inode)->data;

	return 0;

}



static const struct file_operations xt_match_ops = {

	.owner	 = THIS_MODULE,

	.open	 = xt_match_open,

	.read	 = seq_read,

	.llseek	 = seq_lseek,

	.release = seq_release,

	.release = seq_release_private,

};



static void *xt_target_seq_start(struct seq_file *seq, loff_t *pos)

{

	struct proc_dir_entry *pde = (struct proc_dir_entry *)seq->private;

	u_int16_t af = (unsigned long)pde->data;



	mutex_lock(&xt[af].mutex);

	return seq_list_start(&xt[af].target, *pos);

	return xt_mttg_seq_start(seq, pos, true);

}



static void *xt_target_seq_next(struct seq_file *seq, void *v, loff_t *pos)

static void *xt_target_seq_next(struct seq_file *seq, void *v, loff_t *ppos)

{

	struct proc_dir_entry *pde = (struct proc_dir_entry *)seq->private;

	u_int16_t af = (unsigned long)pde->data;



	return seq_list_next(v, &xt[af].target, pos);

}



static void xt_target_seq_stop(struct seq_file *seq, void *v)

{

	struct proc_dir_entry *pde = seq->private;

	u_int16_t af = (unsigned long)pde->data;



	mutex_unlock(&xt[af].mutex);

	return xt_mttg_seq_next(seq, v, ppos, true);

}



static int xt_target_seq_show(struct seq_file *seq, void *v)

{

	struct xt_target *target = list_entry(v, struct xt_target, list);

	const struct nf_mttg_trav *trav = seq->private;

	const struct xt_target *target;



	if (strlen(target->name))

		return seq_printf(seq, "%s\n", target->name);

	else

	switch (trav->class) {

	case MTTG_TRAV_NFP_UNSPEC:

	case MTTG_TRAV_NFP_SPEC:

		if (trav->curr == trav->head)

			return 0;

		target = list_entry(trav->curr, struct xt_target, list);

		return (*target->name == '\0') ? 0 :

		       seq_printf(seq, "%s\n", target->name);

	}

	return 0;

}



static const struct seq_operations xt_target_seq_ops = {

	.start	= xt_target_seq_start,

	.next	= xt_target_seq_next,

	.stop	= xt_target_seq_stop,

	.stop	= xt_mttg_seq_stop,

	.show	= xt_target_seq_show,

};



static int xt_target_open(struct inode *inode, struct file *file)

{

	struct seq_file *seq;

	struct nf_mttg_trav *trav;

	int ret;



	ret = seq_open(file, &xt_target_seq_ops);

	if (!ret) {

		struct seq_file *seq = file->private_data;

	trav = kmalloc(sizeof(*trav), GFP_KERNEL);

	if (trav == NULL)

		return -ENOMEM;



		seq->private = PDE(inode);

	}

	ret = seq_open(file, &xt_target_seq_ops);

	if (ret < 0) {

		kfree(trav);

		return ret;

	}



	seq = file->private_data;

	seq->private = trav;

	trav->nfproto = (unsigned long)PDE(inode)->data;

	return 0;

}



static const struct file_operations xt_target_ops = {

	.owner	 = THIS_MODULE,

	.open	 = xt_target_open,

	.read	 = seq_read,

	.llseek	 = seq_lseek,

	.release = seq_release,

	.release = seq_release_private,

};



#define FORMAT_TABLES	"_tables_names"